lcd module test circuit made in china

STONE Technologies is a proud manufacturer of superior quality TFT LCD modules and LCD screens. The company also provides intelligent HMI solutions that perfectly fit in with its excellent hardware offerings.

There is also a downloadable design software called STONE Designer. This is a completely free GUI design software you can use to create responsive digital module-ready user interfaces.

STONE TFT LCD modules come with a microcontroller unit that has a 1GHz Cortex-A8 CPU. Such a module can easily be transformed into an HMI screen. Simple hexadecimal instructions can be used to control the module through the UART port. Furthermore, you can seamlessly develop STONE TFT LCD color user interface modules and add touch control, features to them.

The famous china LCD display manufacturers. It is the world’s leading semiconductor display technology, products, and services provider. Products are widely used in mobile phones, tablets, laptops, monitors, televisions, cars, digital information displays, and other display fields.

Focus on the development and production of china HMI (Intelligent TFT LCD Module) LCD display manufacturers, production, and sales of LCD display modules for 16 years. The company master TFT LCD technology and software system. The main products are industrial electronic series, advanced series, and civil and commercial series. Application scenarios include automation systems, medical beauty equipment, vending machines, smart lockers, energy, and power equipment (refueling machines, charging piles), elevators, smart homes, and offices, measuring instruments, public transportation, etc.

Mainly committed to the r&d, production, and sales of TFT-LCD/stn-LCD /OLED display modules, it is a modern high-tech enterprise that provides a full range of product LCD module technology and manufacturing support services for TCL group member enterprises and international electronic enterprises.

Set an LCD display module (LCM), capacitive touch screen (CTP), fully integrated touch display module (TDM), LCD thin technology development, production, and service in one national high-tech company.

Domestic size of the top four small and medium-sized flat panel display manufacturers. The products cover medium and small-size TFT-LCD display modules and high-precision miniature cameras, which have been widely used in the fields of smartphones, medical treatment, and industrial display.

The LCD business division is specialized in the r&d, production, and sales of the LCD display (LCD) and LCD module (LCM) series of products. It has ten semi-automatic COG production lines, 1.5KK of monthly COG products, covering COG, TAB, COB, and other LCD module products, TFT, CSTN, and other color LCD display products, and OLED display products. touch screen manufacturers.

Byd IT products and business mainly include the establishment of rechargeable batteries, plastic parts, metal parts, hardware, and electronic products, mobile phone keys, microelectronics, LCD display module, optoelectronic products, flexible circuit board, chargers, connectors, uninterruptible power supply, dc power supply, solar energy products, mobile phone decoration, mobile phones ODM, mobile phone test, assembly operations, laptop, ODM, manufacturing, testing and assembly operations, etc.

Star source products cover backlight, LCD, optical diaphragm, etc., widely used in LCD modules, photo frames, tablets, portable, instruments, and meters.

The company has long invested in the research and development of the TFT-lcm LCD module, focusing on consumer products and industrial control products. Currently, 3.5-11.6 inch modules are available, among which 4.0, 4.3, 5, 6, and 10.1-inch products have reached the leading level in the industry. Products are mainly used in vehicles, mobile TV, PMP, DVD, EPC, security, and industrial control products.

Professional development, design, production, and sales of LCD display module (LCM), products cover COB, TAB, COG, and other LCD module products, TFT, CSTN, and other color LCD display products, as well as OLED display products. Products are widely used in mobile phones, communications, digital products, household appliances, industrial control, instrumentation, vehicle display, color screen display, and other fields.

Mainly engaged in research and development, manufacturing, and sales of the LCD display and LCD display module. Products are widely used in all kinds of electronic products and equipment HMI interface, such as medical equipment, instruments and meters, audio, household appliances, telephone and clocks, game machines, and other different types and use.

Focusing on the LCD module industry, is a collection of research and development, manufacturing, sales as one of the high-tech enterprises. TFT module size from 1.44 to 7 inches, product specifications cover QVGA, WVGA, qHD, HD, etc., the market prospects are broad.

The display manufacturers company mainly researches and develops the LCD display, charger, battery, and other products of mobile communication mobile phone, telephone, MP3, and other high-tech products.

The company integrates research and development, design, production, sales, and service into one, and provides comprehensive touch and display integrated solutions for the complete machine touch screen manufacturer of smartphones, specializing in the development and manufacture of Sensor sensors, capacitive touch screens (GFF/OGS/GG), small and medium-sized LCD (TN/HTN/STN/CSTN/TFT) and corresponding modules and glass cover plate products. The company’s products are widely used in communication terminals (smartphone, tablet computer, etc.), household appliances, car electronics, digital products, and other industries, exported to Europe and America, Japan and South Korea, Singapore, and other countries.

Mainly produces medium and small-size LCD display module (LCM), multi-point capacitive touch screen (CTP), and other high-tech products. At present, more than 1000 models of 1.2-12.1 inch products have been developed. Products are widely used in mobile phones, GPS, mobile TV, tablet computers, digital photo frames, e-books, and other consumer electronics.

It is a professional development and production of small and medium-sized flat panel display upstream materials manufacturers. The company’s main products include LCD display panels, color filter, ITO conductive glass (CF), TFT LCD panel, and capacitive touch screen with multi-touch control functions (sensor and the final module), can provide complete medium and small size flat-panel display device using the solution of raw materials, product specifications varieties complete, widely used in 10.4 inches below the smartphone, tablet, PMP, digital camera, digital camera, GPS and other products of the display panel.

Now it is divided into mobile phone business division: the main products are (2.8-6) inch and the LCD screen and capacitive screen all fit together.MID tablet computer and ultrabook computer division: the main production product size is (7-15) inch capacitive touch screen.

Committed to 3.5~4.3 inches, 5 inches, 5.88 inches, 6.2 inches, 7.0 inches, 8.0 inches, 9.7 inches, 10.1 inches, 12.1 inches medium size FOG, backlight process production, products should be widely used in high-end communication phones, tablets, notebook computers, car TV, navigator, and other display products. automotive LCD display touch screen manufacturers.

The company has an injection molding business division, SMT business division, FPC business division, backlight business division, irrigation crystal business division, TFT module business division, SIN module business division, products involving touch screen, LCD display module, backlight, black and white screen, flexible circuit board.

Engaged in the laptop, tablet, smartphone, computer high-performance board card, LCD module, and other electronic products research and development, production, and sales of high-tech private enterprises.

Is a professional engaged in LCD display module, electronic components, production, design, research and development, sales as one of the high-tech enterprises. Products are widely used in mobile phones, game consoles, PDA, portable DVDs, video phones, intercom doorbells, car video, industrial control medical, and other fields.

STONE provides a full range of 3.5 inches to 15.1 inches of small and medium-size standard quasi TFT LCD module, LCD display, TFT display module, display industry, industrial LCD screen, under the sunlight visually highlight TFT LCD display, industrial custom TFT screen, TFT LCD screen-wide temperature, industrial TFT LCD screen, touch screen industry. The TFT LCD module is very suitable for industrial control equipment, medical instruments, POS system, electronic consumer products, vehicles, and other products.

The utility model relates to a liquid crystal display module (LCM) test jig which comprises a base and a press plate arranged on the base. A sliding track is arranged on the base, a movable support is installed in the sliding track, the press plate is installed on the movable support, a press clip is arranged at one end of the press plate, and the press clip is used for controlling up-down press of the press plate. A transition plate is arranged under the press plate, and a test pin is arranged on the transition plate. The jig further comprises a power supply circuit and a test circuit which are sequentially connected and a voltage protection circuit connected with the power supply circuit. The test circuit is connected with a product to be tested through the test pin. The LCM test jig is strong in generality, simple in operation, capable of effectively improving test efficiency, safe and reliable due to the fact that circuit protection measures are arranged in the jig.

In the prior art; The test of LCM module generally is man-to-man form with tool, develops a measurement jig separately to each module, and the groove of special with good grounds module size design is used to place module to be measured in the tool; And a clip is set is used to grasp module, the test of switching on again.There is following shortcoming in this measurement jig: (1) all needs washing trough again, location and replacing clip to each new model product, uses too limitation, causes the waste of material and man-hour; (2) use above-mentioned traditional testing tool, also cause the tester tired easily, influence work efficiency; (3) the tool WV is 5V, and voltage surpasses 5V mainboard easy burn-out, does not have protect measure.

Said tool also comprises power circuit, the test circuit that connects successively, and test circuit is connected to product to be measured through the test pin.

Compared with prior art, the beneficial effect of the utility model is following: (1) said tool can be used for testing multiple LCM module, and highly versatile is simple to operate, can effectively improve testing efficiency; (2) said tool operating voltage range is wide, and is provided with protect measure, and is safe and reliable; (3) said tool volume is little, simple and easy lightly, cost is low.

LCM measurement jig as shown in Figure 1, that the utility model disclosed comprises base 1, pressing plate 2, travel(l)ing rest 3, pressing clip 4.Wherein, travel(l)ing rest 3 is arranged on the base 1 through sliding rail, and pressing plate 2 is installed on the travel(l)ing rest 3; The pressing plate below is provided with rebound 5; Rebound is provided with test pin 6, and an end of pressing plate 2 is provided with pressing clip 4, through pressing clip 4 realize pressing plates up and down by pressure-controlled.

Said tool adopts the power supply of 5-12V power supply, and the electronic circuit of tool partly comprises power circuit, the test circuit that connects successively, and test circuit is connected to product to be measured through the test pin.Power unit also comprises the voltage protection circuit that is connected with power circuit.

During use; Product to be measured is positioned on the measurement jig; Put in order the position of travel(l)ing rest 3 according to the adjustable size of product to be measured; Be located at product to be measured top, the position is adjusted the back and is pushed pressing plate 2 through pressing clip 4, and the test pin on the product to be measured is closely contacted with test pin 6 on the rebound 5.Connect voltage then, test getting final product.

2. LCM measurement jig according to claim 1 is characterized in that, said pressing plate below is provided with rebound, and rebound is provided with the test pin.

3. LCM measurement jig according to claim 1 and 2 is characterized in that, said tool also comprises power circuit, the test circuit that connects successively, and test circuit is connected to product to be measured through the test pin.

4. LCM measurement jig according to claim 3 is characterized in that, also comprises the voltage protection circuit that is connected with power circuit.

VDD, V1, V2, V3, V4, V5 are the branch pressure voltage signals that is produced respectively by the precision resistance 45 in bleeder circuit, the analog switch part; VCOMA and VCOMB are that row drives stepped-up voltage; VSEGA and VSEGB are that row drive stepped-up voltage;

By Fig. 1 to Fig. 8 as seen: the utility model comprises test panel control section 1, microprocessor test control section 2, LCD driver part 3, bleeder circuit, analog switch part 4, liquid-crystal display section 5; Described test panel control section 1 by with the two-way control LCD driver part 3 that is connected of microprocessor test control section 2; Described LCD driver part 3 outputs to bleeder circuit, analog switch part 4 with control signal and row control signal and row control signal; Described bleeder circuit, analog switch part 4 will be gone driving, row driven sweep voltage and be outputed to liquid-crystal display section 5;

Described bleeder circuit, analog switch part 4 comprise capable driving voltage generator 41, row driving voltage generator 42, line-sweep voltage generator 43, column scan voltage generator 44; The input end of described capable driving voltage generator 41 is controlled under VDD, V1, V4, the V5 branch pressure voltage signal in the control signal of LCD driver part 3 outputs, output VCOMA or the capable driving of VCOMB stepped-up voltage; The input end of described row driving voltage generator 42 is controlled under VDD, V2, V3, the V5 branch pressure voltage signal in the control signal of LCD driver part 3 outputs, and output VSEGA or VSEGB row drive stepped-up voltage; The input end of described line-sweep voltage generator 43 is exported row driven sweep voltage under the capable driving of capable control signal control VCOMA, the VCOMB of LCD driver part 3 outputs stepped-up voltage; The input end of described column scan voltage generator 44 drives under the stepped-up voltage at the control of row control signal VSEGA, the VSEGB of 3 outputs of LCD driver part row, output row driven sweep voltage;

Described LCD driver part 3 can be a field programmable logic array (FPLA), comprises order register, command decoder, data register, video data register, character generator ROM (read-only memory), character generator read-write memory, parallel-to-serial converter and shift register module.

Give liquid crystal display driver part by microprocessor test control section sending controling instruction data, LCD driver part return state data are to microprocessor test control section 62;

To go driving, row driven sweep voltage by bleeder circuit, analog switch part and output to liquid-crystal display section, this scanning voltage is finished the demonstration 64 of liquid-crystal display section in order to the scan control liquid-crystal display section;

The printed circuit board (PCB) that uses in electronic equipment (PCB) has many being used to obtain Analogous Integrated Electronic Circuits (IC) and the digital IC chip that row drives row driving stepped-up voltage, and these IC chips are connected to each other on PCB.The technician can select the quantity and the connected mode thereof of analog IC and digital IC chip to this according to the capacity of display size of LCD (LCD), realizes that LCD drives demonstration emulation testing function.

The utility model design and method of testing be divided into test panel control section, microprocessor (MCU) test control section, LCD driver (LCD Driver) partly, bleeder circuit, analog switch part and liquid-crystal display section totally five parts form.

The test panel control section is mainly finished the writing and carry out exchanges data with LCD Driver of content measurement, test vector of LCD Driver, shows also to keep detecting information.It is to send test vector by PC RS232 bus to MCU, is instructed by the MCU executable operations.

MCU test control section is finished the instruction manipulation of MCU to LCD Driver mainly by the interface of MCU and LCD Driver.The MCU testing software has comprised all instruction actions that LCD Driver can respond.The test vector that it sends by MCU serial ports acceptance test panel control section, MCU are carried out the operational order of response to LCD Driver according to test vector.

The LCD driver section replaces with field programmable logic array (FPLA) (FPGA) in the utility model, its functional module mainly comprises order register (IR), command decoder (ID), data register (DR), video data register (DDRAM), character generator ROM (read-only memory) (CGROM), character generator read-write memory (CGRAM), parallel-to-serial converter (PTS), shift register parts such as (SR), and finally produce the LCD drive signal, simultaneously status data is returned to MCU test control section.

Bleeder circuit, analog switch part can be divided into capable driving voltage generator, row driving voltage generator, its key is that bleeder circuit, analog switch partly utilize chip to realize the gating and the combination of aanalogvoltage, reaches the LCD scan-control voltage, realizes dividing potential drop by precision resistance.VDD, V1, V2, V3, V4, V5 are precision resistance branch pressure voltage signal.Can set V5=0V, V4=1V, V3=2V, V2=3V, V1=4V, VDD=5V.

Its principle of work is; FPGA LCD driver produces FPGA_Ctrl control figure amount signal, five kinds of voltages of control chip gating V5-VDD, produce VCOMA, VCOMB, four kinds of combination voltage signals of VSEGA, VSEGB, FPGA_Ki, FPGA_Ci (i=1 that FPGA LCD driver produces, 2..) control figure amount signal, control chip gate voltage VSEGA or VSEGB, VCOMA or VCOMB produce combination voltage signal LCD_Si, LCD_Ci, LCD_Si, LCD_Ci (i=1,2..) scan control LCD lattice point bright or dark, to reach that LCD shows and the low-power consumption life-span such as grows at advantages.

Driving voltage generator of the present utility model has been realized the required voltage difference of scan control LCD.Implementation method is: the row driving voltage has two kinds of states such as VCOMA, VCOMB, wherein VCOMA has two kinds of voltages such as 4V, 1V, VCOMB has two kinds of voltages such as 0V, 5V: in like manner, the row driving voltage has two kinds of states such as VSEGA, VSEGB, wherein VSEGA has two kinds of voltages such as 5V, 0V, VSEGB has two kinds of voltages such as 3V, 2V, and by row driving voltage generator, row driving voltage generator is realized respectively in their realization.

Line scanning and column scan stepped-up voltage generator.Row drives stepped-up voltage, selects VCOMA by lcd driver integrated circuit (IC) chip controls, and VCOMB produces; Row drive stepped-up voltage, select VSEGA by lcd driver integrated circuit (IC) chip controls, and VSEGB produces.Row drives stepped-up voltage and row drive stepped-up voltage synchronous scanning control LCD, shows the data result of test.Among Fig. 4 FPGA_C1, FPGA_C2, the capable control signal of FPGA_C3, FPGA_C4, control line-sweep voltage LCD_C1, LCD_C2, LCD_C3, LCD_C4 produce, FPGA_K1, FPGA_K2, FPGA_K3, FPGA_K4 are the row control signal among Fig. 5, and control column scan voltage LCD_S1, LCD_S2, LCD_S3, LCD_S4 produce.

After the LCD display part shows that then test vector is through LCD Driver, actual displaying contents under scanning voltage control, the technician can partly carry out analysis and judgement according to the emulation display result to LCDDriver very intuitively.

The test vector of this method of testing is produced by panel control program in the test panel control section (PCPanel Programmer), and panel control program device sends test vector by computing machine RS232 interface to MCU.MCU is connected with lcd driver (LCD Driver) chip, and MCU sending controling instruction data are given the lcd driver chip, and lcd driver chip return state data are given MCU.After the lcd driver chip receives the steering order data, produce control signal and row driving (COMMON Driver) row and drive (SEGMENT Driver) instruction output, drive bleeder circuit, analog switch part, the analog switch part produces row driving and row driving stepped-up voltage according to control signal and row driving row drive signal.This scanning voltage is finished LCD and is shown in order to scan control LCD.

Looking to take your project to the next level in terms of functionality and appearance? A custom LCD display might be the thing that gets you there, at least compared to the dot-matrix or seven-segment displays that anyone and their uncle can buy from the usual sources for pennies. But how does one create such a thing, and what are the costs involved? As is so often the case these days, it’s simpler and cheaper than you think, and [Dave Jones] has a great primer on designing and specifying custom LCDs.

The video below is part of an ongoing series; a previous video covered the design process, turning the design into a spec, and choosing a manufacturer; another discussed the manufacturer’s design document approval and developing a test plan for the module. This one shows the testing plan in action on the insanely cheap modules – [Dave] was able to have a small run of five modules made up for only $138, which included $33 shipping. The display is for a custom power supply and has over 200 segments, including four numeric sections, a clock display, a bar graph, and custom icons for volts, amps, millijoules, and watt-hours. It’s a big piece of glass and the quality is remarkable for the price. It’s not perfect – [Dave] noted a group of segments on the same common lines that were a bit dimmer than the rest, but was able to work around it by tweaking the supply voltage a bit.

We’re amazed at how low the barrier to entry into custom electronics has become, and even if you don’t need a custom LCD, at these prices it’s tempting to order one just because you can. Of course, you can also build your own LCD display completely from scratch too.

Hana Microelectronics (Jiaxing) Co., Ltd. is a manufacturing factory located in Jiaxing, Zhejiang Province, China. The factory space has approximately 91,551 square meters and operated since 2005. The company manufactures electronic products such as IC Assembly and Test, LED, Power Modules, RFID Devices and PCBA products. The products are covering across multiple products portfolio such as Automotive, Medical, Industrial, Telecommunication, Consumer and etc.

Employing over 1,400 people, Hana Jiaxing is equipped with fully automated machineries for Integrated Circuit (IC) Assembly and Test, Chip-On-Board (COB), Chip-On-Flex, Chip-In-Board (CIB), Surface-Mount (SMT), Micro-Coil Winding, Printed Circuit Board Assembly (PCBA), Opto Electronics Assembly, Box Built Product Assembly, Hybrid Module Assembly, RFID Card Lamination services and IGBT and SiC Power Module Assembly.

U.S. person "support" restrictions. The interim rule also serves as a notice that activities by U.S. persons that "support" the "development" or "production" of integrated circuits (ICs) at Chinese semiconductor fabrication facilities could also trigger the need for an export license.

Updates to the Foreign Direct Product rule. The interim rule creates two new Foreign Direct Product (FDP) rules with respect to products in the advanced computing and supercomputing spaces. The rules stipulate that if a foreign item meets specific product and destination scope tests as set forth in detail in the interim rule, the items will be "subject to the EAR" and any associated licensing requirements.

• The interim rule effectively broadens the reach of the Committee on Foreign Investment in the United States (CFIUS) through the addition of new CCL entries. The new CCL entries, certain of which are controlled for "regional stability," expand CFIUS" jurisdiction to cover a wider range of companies engaged in the production, design, testing, manufacture, fabrication, or development of the newly controlled items and technology.

There are many reasons why companies are producing this type of PCB. However, we will be focusing on its main use for this article. They make these types of PCBs to protect other components from damage. For example, we would cover an LCD screen in a frame made using rigid flex boards. Even when you have a damaged LCD screen, the rigid flex PCB could minimize the damage to just the cover and not the actual hardware.

Rigid flex PCBs have been around for decades. The first documented use of rigid flexible printed circuit boards was in the 1970s. They were essential in creating many different electronic devices. Also, their popularity increased as technology advanced.

Making rigid flex circuit boards is no different from creating a regular rigid PCB, but only in their cover. The manufacturing process is like a rigid PCB, but they combine the base and frame. One can make the base itself out of plastic or metal. Companies opt to use aluminum in many cases as it is more cost-effective than plastic.

You will want to choose Rigid flex PCB manufacturing companies with a fast shipping method in place. It helps to avoid waiting too long to get your Rigid flex bord samples. This will ensure that you do not wait too long before shipping them. It also ensures that your Rigid flex PCB samples will reach you in the shortest amount of time possible.

Many companies are trying to find the best way to create these PCBs for their customers. In the end, the best way to find an excellent Rigid flex printed circuit board manufacturing company is by choosing a company that specializes in Rigid flex PCB manufacturing.

To ensure that the rigid flex PCBs you get will be safe and effective, it is essential to go with a Rigid, flexible PCB manufacturing company with all their packaging and products tested by an authorized testing facility.

Decoupling capacitors allow the Rigid, flexible PCB to have a quality signal strength. The quality of the decoupling capacitor will determine how strong or weak the output of your Rigid flex printed circuit borads will be.

As the Rigid flex PCB market grows, producing high-quality rigid flex PCBs has become essential. You will want to choose Rigid, flexible PCB manufacturers that can produce all types of rigid flex PCBs. One type of rigid flex circuit board you should start to look for is the UL94V-0 rating. This will ensure that your Rigid flex PCB samples are highly durable and can withstand a high level of heat and flame.

Manufacturing rigid flex PCBs requires special machines with rigorous testing using specialized software. The factory’s procedures and equipment must be just as good as the company’s quality control system.

The top 10 rigid flex PCB manufacturers in China mentioned below all have passed rigid flex PCB production standards testing. These manufacturing factories use advanced technologies. They include the thin film core technology and electrodeless pick and place of the copper foil. It also has double-sided rigid flex PCB and flexible-flex PCB production lines.

This is another Rigid, flexible PCB manufacturer in Shenzhen, China. Shennan Circuits has been in business for more than ten years and can provide rigid flex PCBs with UL 94 V-0 flame rating and make all types of rigid flex PCBs. They are a well-known Rigid, flexible PCB manufacturer and have customers worldwide.

Shennan Circuits is more than qualified to help you create the best Rigid flex PCBs for your business. Not only do they have an excellent reputation for working with large businesses. However, they will also ensure that your Rigid flex PCBs are safe and of high quality before leaving their office.

HuanYu Future Technologies is in Shenzhen, China, helping businesses create high-quality rigid flex PCBs for over ten years. They are a Rigid, flexible circuit manufacturer that has been in business for over 22 years and has provided many different types of rigid flex PCB.

Shenzhen A-Star Circuits Co is a Rigid, flexible circuit manufacturer that has been in business for over ten years. They can provide much different rigid flex PCBs and have created many different rigid flex PCB.

Shenzhen A-Star Circuits Co can provide low-cost Rigid, flexible PCB and ensure that your Rigid, flexible PCB samples are safe to use before leaving their office. They will also ensure that your rigid flexible PCB samples are up to the highest standards before leaving their office.

The merchandise under consideration is identified as the Wacom Cintiq 16 with Pro Pen 2 (Cintiq 16). The Cintiq 16 is a device known as a drawing tablet, and it is described as a multifunctional device that has a liquid crystal display (LCD) with a touch screen that operates in conjunction with automatic data processing (ADP) machines. Therefore, the Cintiq 16 does not operate as a stand-alone unit. The user of the Cintiq 16 can make professional drawings and images, such as animations and industrial designs, and is able to draw directly onto the LCD screen by using a specialized stylus, a pen-like drawing apparatus stylus. The Cintiq 16 only functions as a drawing tablet and does not perform any other operations. The product is comprised of an LCD display module, front and back cover assemblies, and various printed circuit board assemblies (PCBAs). When it is sold to the consumer, the Cintiq16 is retail packaged with a power adapter, specialized cables, and the stylus pen.

Once the Cintiq 16 is connected, the display image from the ADP machine’s monitor is duplicated on the Cintiq 16 LCD. Thus, the LCD screen on the Cintiq 16 tablet functions as a secondary display while users create and/or edit content via the touch surface. Likewise, users have the capability to interact with their project and can visualize the results via an ADP machine’s display output.

The first two stages of production of the Cintiq 16 involves manufacturing two subassemblies in China, which are identified as the back-cover module and the front-cover module. The back cover module contains air vents inside the plastic cover, a pen tag and two small rubber anti-rolling strips on the external body of the plastic cover. The assembly of the front-cover module consists of (1) placing glass on the plastic cover; (2) attaching the LCD panel behind the cover; (3) attaching the EMR board behind the LCD panel; and (4) placing the open cells and the backlight behind the cover.

The Chinese-origin back-cover and front-cover modules will then be shipped to Taiwan together with the stylus pen, pen holder, AC adaptor, and a power cable. In addition, the following three bare Printed Circuit Boards (“PCBs”) (bare SCB PCB, bare scaler board PCB, and bare keypad board PCB) will be shipped to Taiwan for further manufacturing into the finished PCBAs through SMT. In Taiwan, the SMT processes will be used to populate each of the bare PCB’s boards with the various electronic components so that they will become fully built PCBAs. Upon completion of the SMT processes, Japanese-origin WTC tablet firmware will be installed on the SCB and Taiwanese-origin scaler board firmware will be installed on the scaler board.

The scaler board is attached to the front-cover module. The SCB is attached to the LCD panel in the front-cover module so that it can sense and capture each pen stroke’s pressure on the bare EMR board. Without the SCB underlying it, it is claimed that the EMR board will not function as a sensor. The keypad board is also assembled to the front-cover module, and it is interconnected to the scaler board with cables to allow the transmission of signals and to function as a complete unit. The back-cover module is then combined with the front-cover module with screws.

Counsel contends that the EMR board is a simple PCB board with tiny magnetic sensor coils, and it has no electronic components on it. It is attached behind the LCD screen to allow the sensor coils to magnetically capture each pen stroke. Counsel also claims that the SCB monitors the movement of the sensor coils attached on the EMR board, and that it recognizes each pen stroke, the pen’s location, pressure, and speed, and that it transmits these interpreted, digitized input signals to the output unit, i.e., the scaler board.

In addition, counsel states that the role of the scaler board is as an output unit that generates images on the LCD screen. The scaler board has the highest number of components among the four different PCBAs. While the scaler board is responsible for producing the images on the LCD screen, as an alternative the consumer/artist can still use the Cintiq 16 tablet without the LCD screen, since the user can always view drawings produced on a connected external monitor.

When determining the country of origin for purposes of applying trade remedies under Section 301, the substantial transformation analysis is applicable. The test for determining whether a substantial transformation will occur is whether an article emerges from a process with a new name, character, or use, different from that possessed by the article prior to processing. See Texas Instruments, Inc. v. United States, 681 F.2d 778 (CCPA 1982). In deciding whether the combining of parts or materials constitutes a substantial transformation, the determinative issue is the extent of operations performed and whether the parts lose their identity and become an integral part of the new article. See Belcrest Linens v. United States, 6 CIT 204, 573 F. Supp. 1149 (1983), aff’d, 741 F.2d 1368 (Fed. Cir. 1984). Assembly operations that are minimal or simple, as opposed to complex or meaningful, will generally not result in a substantial transformation. Factors which may be relevant in this evaluation may include the nature of the operation (including the number of components assembled), the number of different operations involved, and whether a significant period of time, skill, detail, and quality control are necessary for the assembly operation. See C.S.D. 80-111, C.S.D. 85-25, C.S.D. 89-110, C.S.D. 89-118, C.S.D. 90-51, and C.S.D. 90-97.

Additionally, factors such as the resources expended on product design and development, the extent and nature of post-assembly inspection and testing procedures, and worker skill required during the actual manufacturing process will be considered when determining whether a substantial transformation has occurred. No one factor is determinative

Counsel points out that there are four major components that make up the Cintiq 16 tablet. They are the SCB, scaler board, keypad board, and front-cover module. Consistent with CBP’s previous decisions on PCBAs, populating PCBs with various microelectronic components by using SMT constitutes a substantial transformation of the blank PCB boards and individual microelectronic components contained on the boards. See C.S.D 19 Cust. Bull. 844 (1985). Therefore, we find that the country of origin of the three individual PCBAs that are populated with components in Taiwan using SMT, (the SCB, the Scaler Board, and the Keypad Board) is Taiwan. However, in determining the country of origin of the finished Cintiq 16, we must analyze whether these Taiwanese origin PCBAs and the other manufacturing operations performed in Taiwan determine its country of origin when combined with the Chinese-origin components.

Counsel contends that the Taiwanese-made PCBAs impart the essence to the Cintiq 16 drawing tablet and that three of the four PCBAs used in the Cintiq 16 will now be made in Taiwan. Counsel emphasizes the importance of the SCB PCBA because it is the component in the drawing tablet that provides the specialized pressure sensitive technology used in the drawing process and what separates the Cintiq 16 drawing tablets from similar devices like other tablets which also permit basic drawing onto an LCD screen with a stylus, such as an “Apple iPad” or a “Microsoft Surface.” It is this technology why consumers would choose to buy the Cintiq 16 drawing tablet. In addition, counsel points out that the Taiwanese-made PCBAs are more sophisticated than the Chinese-made subassemblies and parts, such as the EMR board, and they contain far more individual components. Counsel maintains that the accessories, such as the stylus pen, the power adapter, and specialized cables that are sold together with the Cintiq 16 tablet should not be given a lot of weight in determining the country of origin of the finished product.

Accordingly, in analyzing what is the country of origin of the Cintiq 16, we consider the various functions of the components of the Cintiq 16 to see if they determine the essence of the finished product. We recognize that the Cintiq 16 is a combined input/output device that has two distinct functions. The first function is that of an input device by manipulating images that are drawn using a specialized uniquely suited stylus ono the LCD screen. The second function of the Cintiq 16 is to perform as an output device by showing the images drawn on the LCD screen of the Cintiq 16 and, at the same time, onto a monitor of a linked ADP machine, such as a computer if that computer has a monitor connected to it. However, it is noted that if an attached desktop PC does not have a monitor and the Cintiq 16 is plugged into the desktop, the LCD of the Cintiq 16 will function as the primary monitor with a touch surface. Consequently, an attached monitor from the ADP machine is not required for the Cintiq 16 to function as a drawing tablet.

It is also noted that for the drawing tablet to create an image, an electromagnetic signal between the stylus and the PCBAs located in the drawing tablet must be generated. The magnetic field emanating from the stylus pen is recognized by sensor boards (EMR Board and the SCB PCBA). The electromagnetic resonance technology allows for the stylus pen"s location, pressure, and speed to be tracked and registered. The Chinese origin stylus pen generates a data signal which is detected by the tablet. When a user draws a line using the stylus, the coil circuit transfers the signals to the main circuit inside the stylus. By using electromagnetic signals, the tablet can sense the position of the stylus. The tablet generates an electromagnetic signal, which is received by a circuit in the stylus. The stylus works as an antenna that receives the signal and generates another electromagnetic field that "talks" back to the tablet. The SCB board receives a signal from the stylus and, through its pressure sensitive technology, contributes to making the image drawn on the Cintiq 16. The SCB monitors the movement of the sensor coils attached on the EMR board, and recognizes each pen stroke, the pen’s location, pressure, and speed, and transmits these interpreted, digitized input signals to the output unit, i.e., the scaler board. Without the SCB underlying it, it is claimed that the EMR board does not function as a sensor. In other words, it is the interaction between the Chinese origin stylus and the Chinese origin EMR board with the Taiwanese origin SCB board that allows the Cintiq 16 to generate a visible image.

The fact that the image shown on the LCD screen is duplicated on a monitor and on a connected ADP machine does not negate the fact that the Cintiq tablet 16 also functions as an output device by displaying an image on its LCD screen. With respect to which components of the Cintiq 16 impart its output function, we note that the Chinese-made LCD panel subassembly displays the image of what is being drawn as well as duplicating the primary display. However, the Taiwanese-made scaler board also greatly contributes to allowing an image to be displayed. Thus, again, it is the combination of Taiwanese and Chinese components in the Cintiq 16, that allows the Cintiq 16 to function as an output device that can display images.

impart the essence of the device. In this instance, it is the interplay between the stylus, EMR SCB, scaler boards, and LCD that allow the Cintiq 16 to generate the images and to display those images onto a screen.

In HQ H015324, CBP was asked to determine the country of origin of stereoscopic displays assembled in the U.S. from non-U.S. parts. The displays consisted of two LCD monitors from China or Taiwan, mounted in a custom-made stand with a special beamsplitter mirror mounted at a bisecting angle between the two monitors. A graphics card in the computer separately transmitted right eye and left eye video. The importer would send one of the monitors to a third-party in the U.S. for an optical transformation process, after which the displays would be assembled, aligned, and tested. CBP found that the processing and assembly operations in the U.S. resulted in a substantial transformation of the imported LCD monitors and the beamsplitter mirror. We found that the polarization process performed in the U.S. changed the essential character of the LCD and imparted the stereoscopic functionality to the entire system. In addition, the assembly, testing and alignment of the display required a significant amount of time and precision by skilled technicians. In other words, it was the extensive processing performed in Taiwan that determined the country of origin of the stereoscopic displays.

In this case, under the new proposed production scenario, we find that the most significant work in manufacturing of the Cintiq 16 is now being performed in Taiwan. This processing work now includes the production of the three PCBA boards, the SCB PCBA, the scaler board, and the keypad board, with the addition of the Taiwanese firmware. We note that building the three PCBA boards is technically intricate and a complex operation. It involves using SMT to populate a myriad of electronic components, including the attachment of the active and passive elements as well as other components onto a bare printed circuit board by soldering, gluing and other means. In addition to the intricate work of populating the components onto the blank PCB boards, they will be programmed with specially written firmware and software, which lets the Cintiq 16 tablet perform its function as a drawing tablet. Consequently, in this new production scenario, the production operations performed in the Taiwan are more extensive and complex than the work that was being performed in Taiwan in NY N308714. In addition to producing the three PCBAs in Taiwan, other processing operations will also be performed in Taiwan to manufacture the Cintiq 16m, including installing the PCBAs into the housing, connecting cables, installing firmware, and final assembly of all the various components to produce the finished tablets. We note that the total processing operation that will be performed in Taiwan to make the Cintiq 16 requires a significant amount of time and skill to complete.

In the process of manufacturing a thin film transistor-liquid crystal display (TFT-LCD) panel, specifically in the phases of manufacturing an array and a cell, the yield of the liquid crystal panel is generally monitored through a test such as light-on testing. Connection between a test circuit and circuits on a display area can be removed out or laser out after a test. However, under some circumstances, the removal out or laser out is not very convenient. If the test circuit is reserved, leakage currents exist between the sources and the drains of components such as TFT (thin film transistor) switches in the test circuit, which interfere with the data lines and gate lines of the display area. In one case, for preventing the leakage currents of the TFT switches in a cut-off state, the channel lengths of the TFT switches can be made longer than before, for example, about 10 microns. But by doing so, it is disadvantageous for the design of a narrow frame.

Therefore, there is a need of a panel detection circuit capable of effectively preventing the test circuit from interfere with a display panel during the operation of the display panel.

One aim of the present disclosure is to provide a panel detection circuit capable of effectively preventing the test circuit from interfere with a display panel during the operation of the display panel.

In order to solve the above-mentioned technical problems, the present disclosure provides a detection circuit for a display panel, wherein the circuit comprises:

a transistor array, the gates of which are connected to the connection lines for introducing the control signal, wherein, the connection lines for introducing the test signal are connected with data lines or scanning lines of the display panel via the sources and the drains of transistors, under the control signal,

In an embodiment of the present disclosure, the component is another transistor, the gate and the source of which are connected, so as to connect to the connection lines for introducing the test signal, and the drain of which is connected with the gates of the transistor array.

Compared with the prior art, the present disclosure brings the following beneficial effects: (1) by arranging the component between the gates of the transistor array and the shorting bar for further reducing the voltage on the gates, the whole transistor array can be reliably cut off when applying a low-level signal to control the transistor array, so as to reduce the leakage currents; (2) by sharing the connection lines for introducing a control signal and the test lines, it is possible to prevent the suspension of the detection circuit from interfering the normal operation of the display panel; and (3) the detection circuit of the present disclosure can further reduce the channel length of the TFT, thus being advantageous for the design of the narrow frame.

FIG. 1 shows a schematic diagram of a detection circuit. In FIG. 1, test pads 1-7 each are connected to the data lines and the scanning lines of the display panel via a digital switch array (for example, a TFT switch array) and wires (or connection lines) on a shorting bar. The digital switch array is not limited to the TFT switch array, and other controllable digital switch arrays such as a transistor array can also be applied to the present disclosure. In the technical field of LCD (liquid crystal display), TFT switch transistors are preferably used as the digital switches.

In addition, the connection lines on the shorting bar comprise control connection lines respectively connected to the test pad 1 and the test pad 5, and test connection lines respectively connected with the test pads 2-4, the test pad 6 and the test pad 7. The test pad 1 and the test pad 5 are connected to the gates of the TFT switches through the control connection lines. The test pads 2-4, the test pad 6 and the test pad 7 are connected to the drains of the TFT switches through the test connection lines. The sources of the TFT switches are connected with the data lines or the scanning lines arranged on the display area. Different numbers of TFT switches and different numbers of the test pads can be distributed on the data lines or the scanning lines according to actual conditions, so as to perform a light-on test. For example, the test pads 2-4 can be connected to the data lines via 6 TFT switches, and the test pad 6 and the test pad 7 can be connected to the scanning lines (gate lines) via 4 TFT switches.

During detection, a high-level signal is input to the test pad 1 and the test pad 5, thus controlling the TFT switches to be turned on. Therefore, a test on the display panel can be performed only by respectively applying a signal required for the detection on the test pads 2-4, the test pad 6 and the test pad 7.

During using the display panel after being manufactured, a low-level signal is input to the test pad 1 and the test pad 5 to cause the TFT switches to be cut off, thus further breaking connection between the shorting bar and the data lines or the scanning lines (gate lines).

According to such design, in order for saving the time, there is no need for laser-cutting connections among the shorting bar, the data lines and the scanning lines after detecting the display panel,. However, during the working of the display panel, the TFT switches are in a negative bias state for a long time, and no test signal exists on the test pads 2-4, the test pad 6, and the test pad 7, which results in that the drain sides of the TFT switches are always in suspending state. The suspending state will generate a fluctuation of voltages under some circumstances, which may cause that the sources and the drains of the TFT switches from leakage channels on the condition of reverse cut-off, and thereby generate leakage currents. One circumstance of the leakage currents is indicated by a bold line in FIG. 2. To some extent, the leakage currents will indirectly cause the interference of an external signal with the data lines or the scanning lines via the shorting bar, thus the display quality of the panel is influenced.

Therefore, the present disclosure further provides a circuit for testing a display panel, which comprises a shorting bar and a transistor array. As shown above, connection lines for introducing a test signal or a control signal are distributed on the shorting bar. The connection lines for introducing the test signal are connected with the data lines or the scanning lines of the display panel via the sources and the drains of transistors under the control signal.

In actual applications, the component may be a diode or another transistor. In the case that the component is a diode, the cathode of the diode is connected with the gates of the transistor array, and the anode of the diode is connected to the test pads for introducing a control signal. In the case that the component is a transistor, the gate and the source of the transistor are connected with each other, thus being connected to the connection lines for introducing the control signal together. The drain of the transistor is connected with the gates of the transistor array.

FIG. 3 is a schematic diagram of an improved equivalent circuit according to the above-mentioned manner in which the leakage currents of the transistor array are avoided. In the diagram, another TFT switch, indicated by TFT2, is added between the gate of the digital switch indicated by TFT2 in FIG. 3 and the test pad 1.

FIG. 4 shows a schematic diagram of a detection circuit applying the above-mentioned improvement to circuits of a display area. The difference between FIG. 4 and FIG. 1 is that another digital switch TFT2 is placed between the gate line of a switch array TFT1 and the wires of the shorting bar. The source and the gate of the digital switch TFT2 are connected, and the drain is connected with the gate of the digital switch TFT1, for controlling the TFT1 to be reliably cut off.

As shown in FIG. 5, it is another equivalent circuit, wherein the gate and the source of the digital switch transistor TFT1 are connected, thus being connected to the test pads introduced with a test signal, and the drain of the another transistor is connected with the gates of the transistor array. In this circumstance, there is no need to arrange control lines additionally on the shorting bar, and thus there is no need for a special control signal.

As shown in FIG. 6, during a test, a voltage on a test circuit is high enough to turn on the TFT1 and the TFT2, and a test signal is introduced onto the data lines and the scanning lines in the display panel via the sources and the drains respectively. Where there is no test, a low-level signal is applied to all test pads, which can avoid that a part of circuits is suspending. In this case, the switch array TFT2 can be reliably cut off without generating leakage currents.

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Are you looking to manufacture LCD monitors? Then you need LCD PCBs to power and control your LCDs, because circuit boards are essential in your electronic device.

Before beginning the manufacture of LCD PCBs, you need to know a lot of facts about the LCD PCBs boards. Info about the manufacturing process, material selections, types of boards, and manufacturer are key factors you need to know.

We will discuss and answer several questions about LCD PCBs in this FAQ article. Go through the entire article to get basic facts about LCD PCB monitor PCB boards.

LCD is an abbreviation for Liquid Crystal Display. Pictures are produced when various electrical voltages are applied to a display device. A display device is an electronic display device that creates images.

The LCD is usually thought of as a collection of diodes. The pictures are produced by the diodes using small cells and ionized gasses. Aside from that, the LCD is based on the light modulation characteristic, which is a mechanism for transmitting and receiving signals via light.

On the other hand, theprinted circuit board (PCB) is the controller board of any electronic device. A Printed Circuit Board (PCB) comprises many components and conductive lines that are hidden from view from the end-user.

So a PCB that is utilized for controlling LCD screens is referred to as the LCD PCB. LCD PCBs are made of different materials such as FR4, Polyamide, and Teflon among others.

To make an LCD PCB, you need to follow specific design procedures. There are a lot of things to consider. For starters, the LCD PCB design begins with drawing the schematic. Here is a further step-by-step design procedure of LCD PCB  production.

The first step to designing an LCD PCB is to start with a schematic. First, you need to draw a schematic of your LCD PCB. You can say the schematic is your circuit’s blueprint.

After creating the schematic, you have to create a blank LCD PCB layout on your computer design tool. Now, import the schematic of the LCD PCB to the blank layout by schematic capture tool.

Determine the stack-up of your LCD PCB with multilayers. You can set any number for the PCB layers you want. You can use the layer stack-up manager to define and design the layers.

After finalizing the PCB layout and layers, you must print the PCB layout on the PCB board. For printing the layout of your LCD PCB, you can use 3D or laser printing. Etch the conductive traces to ensure the electric current flows to the components.

After finishing the successful printing of your LCD PCB, it is time to assemble the PCB. You can use an automated process or manually arrange and place them on your PCB board.

LED stands for Light-Emitting Diode. It is one of the latest display technologies in the market. LED monitors are kind of flat panels or slightly curved. LED panels create high contrast images with less negative impact tone.

The most popular of application is the LCD TV PCB board. These are used for high contrast television monitors. LCD is a cheaper alternative to plasma monitors.

When soldering the base metal of LCD PCB boards together, you may find that the solder does not adhere properly. When the melted solder fails to form a connection, this is referred to as a non-wetting defect of the printed circuit boards.

You may follow the following steps to fix the non-wetting defects on your LCD PCBs:Take proper action to prevent oxidation. Oxidation is one of the biggest causes of non-wetting defects.

Polyamide, commonly known as polyimide, is a PCB board material used to fabricate flexible printed circuit boards. Polyamide is made from a variety of materials, including silk and wool. It is widely utilized in the mass fabrication of LCD PCBs.

The following are some significant advantages that polyamide has:The most common reason to use polyamide is its suberb flexibility. It is mainly used to produce flexible, rigid-flex LCD PCBs.

The LCD controller board is the board that regulates the LCD’s functions. The controller board creates video signals and connects them to various video sources. Then the board creates the visibility of the videos on the LCD when they are connected.

The following are some excellent features of LCD controller boards:The LCD controller boards are capable of displaying images in ultra-high resolution. The resolution may be as high as 3840 x 2160 pixels per point.

Impedance in LCD PCBs measures opposition to electrical flow, which is something measured in ohms. This measurement is vital for the operation of the circuits in high frequency.

The PCB layer stack-up is the process of placing the copper layers and insulating layers one on top of the other. This facilitates you to design and implement many conductive layers of the LCD PCBs in a single PCB.

Testing is among the most essential steps in manufacturing PCBs. Employ proper testing to ensure the required design facts for your LCD PCBs. The following are the most robust testing methods you can use for testing LCD PCBs.

ICT is the most common type of PCB testing. It is also known as a bed of nails testing. The ICT powers up and actuate every circuit on the board. The probes used in the ICT testing create a specific pressure range on the circuits.

In AOI, you have to use two 3D or one 2D camera to take photos of every board detail. Then, you need to compare the photos to the schematic of the LCD PCB. The PCB is okay if the comparison verifies that the board and the schematic are the same.

You cannot expect that your LCD PCB will last forever. But, that does not mean you cannot extend the lifespan of your PCBs. If you follow the following tips, you can extend the life cycle of your PCB significantly.

Temperature is a vital fact in electronics. High heat or excessive heat can harm your LCD PCBs in many ways. You need to monitor your LCD PCBs’ temperature else, the following harm can occur to your PCB:

Finding a reliable manufacturer for LCD PCBs is crucial. A highly skilled and experienced manufacturer can provide you with the best quality products. To find out the best PCB manufacturer, you should check the following criteria:The manufacturer should have intensive experience in the PCB industry.

As An LCD PCB enthusiast, you need proper knowledge about this type of PCB. We hope that this guide reconciled you with the type of information you need. Already, you might sense that a highly experienced manufacturer can help you produce high-quality PCBs for your business.

You may choose us, PCBMay, as your PCB manufacturer. We are a highly professional LCD PCB manufacturer in China. We have been successfully manufacturing all sorts of high-end PCBs for an extended period. You can contact us today to get the best quote for your LCD PCBs.