lcd display assembly code factory

If your car or truck factory radio LCD with touchscreen monitor needs replaced then we provide some of the best replacement car touch LCD screen replacement parts available on the market today. As is Factory Radio Parts standard: all of our car touchscreen repair kits are developed for both ease of use and functionality – so you can get your tunes blasting again in no time!

Displaying Characters on an LCD Character Module describes the initialization, displaying of text and creating, down loading and displaying custom characters on our character modules. The code sample is in 8051 assembly language and a program flow chart is also provided. (79k)

Driving a character display from a PC printer port describes a simple method of controlling an LCD character module directly from the parallel printer port of a PC. There is little, if any extra hardware required and the module may even be powered from the PC. (40k)

Interfacing to a Graphics Module with a T6963C Controller describes the software and hardware to display an image on any Hantronix graphics module with a built-in T6963C controller. This note includes schematic, flow chart and sample software. The code is in 8051 assembly language. (53k)

Interfacing a 128 x 64 Graphic Module with an 8 bit Micro-controller describes the software and hardware to display an image on a Hantronix HDM64GS12. This note includes schematic, flow chart and sample software in 8051 assembly language. (76k)

Interfacing a 128 x 64 Chip-on-Glass Graphics module describes the set-up, initialization and interfacing of an HDG12864-1 LCD module. It describes the use of the built-in power supply and electronic contrast control. (61k)

Displaying in Negative or Positive Mode on Graphics Displays describes a software method of obtaining either a negative or positive image on a graphics display, which is either positive or negative from the factory. (13k)

An explanation of LCD Viewing Angle. This is a technical explanation of how viewing angle is specified and how it influences the selection of the right LCD for your application. (46k)

LED Back Light Driving Methods describes several ways of driving an LED back light with emphasis on a technique for obtaining a bright display with minimum drive current. It also describes a method of controlling the brightness of the LED back light. (14k)

Temperature Compensation for LCD Displays. This paper discusses the issues involved in temperature compensation of the LCD operating voltage. A sample circuit to provide this compensation is also discussed. (23k)

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As a full service provider of LCD modules, PDI specializes in small format (typically 15” and less) character display, graphic display, color display, and custom display formats. Our Customers leverage PDI’s decades of LCD display experience, technical expertise, and manufacturing capabilities to obtain the most competitively priced, highest quality LCD module solution. These solutions span the spectrum from off the shelf standard products to completely custom display based solutions. PDI’s mission is to actively engage our customers early in the design phase. We will utilize our years of LCD experience and our understanding of the compete LCD module system to provide a smooth transition from design concept to prototypes, through pilot run and into high volume production.

Alternatively, if a 100% identical cross match design of an existing display is needed, our team will evaluate your current solution, offer any recommendations for design improvement and then quote accordingly, typically saving up to 20%. Once PDI develops a 100% compatible drop-in replacement display, this LCD module is then fully tested and qualified in the product application prior to shipping. This process insures a plug and play solution.

PDI produces its LCD displays utilizing the latest or most practical technology trends including Chip on Glass (COG), Chip on Board (COB), Tape Automated Bonding (TAB) and Chip on Flex (COF). PDI can integrate touch panels into any of our display systems. In addition to a full portfolio of standard and custom LCD modules, PDI offers manufacturing services to build your display into the next higher sub-assembly or final assembly to give customers the competitive cost advantages afforded to those utilizing off-shore based manufacturing. Often this practice includes integrating the display design and existing peripheral components such as PCB’s, switches, overlays and custom cables which eliminates interconnects, improves the overall system reliability and most importantly, reduces cost.

Customers that need a new supplier for an existing production display. This occurs for a variety of reasons including cost pressures, lead time concerns, quality issues, stocking needs, or lack of responsiveness from current LCD supplier.

Customers that have a new program and require a display solution.This can either be a standard or custom display, and may require engineering support to determine the best display solution.

Customers that need a display, but may also be looking for a more integrated solution. Sometimes this includes a display, touch panel, keypad, I/O connector and custom PCB solution.

To insure production quality, PDI factories are equipped with state-of-the-art machinery and are ISO9001:2008 Quality Certified. In addition, having factories with front and back end glass processing, as well as module assembly, helps reduce lead-times, while providing lower cost solutions. With vertically integrated organizations, factory personnel have a better “system” understanding and can quickly respond to our customers needs.

Dealing with electronic equipment manufactured decades ago have own special flёur to it. Back then we had documentation with nice service manuals, excellent schematics, assembly drawing diagrams, extensive theory of operation and troubleshooting methods. Today professionals and design engineers have to fight against corporate lawyers and business cartels to have legal right to repair equipment we own.

Article today is about a way to revive some old units with faulty display backlight to former glory. It takes huge amount of man-hours and grey-beards to develop advanced and high performance test instruments. Also it is not trivial to maintain equipment in good health, especially for that extended lifespan over 25+ years. Reason is rather generic – many components from the past often not available on the market today. This means difficult and time consuming workarounds and repairs with modern equivalents if any of the obsoleted parts go bad.

In this article we will look at finding replacement for key component of user interface such as graphical LCD screen. Back in the 90’s vacuum fluorescent displays were the king of the market for high end instrumentation. We can name just few well known examples – HP 3458A, Fluke 5700A, Datron 1281 or even daily bench meter like HP 34401A. LCD tech still was quite new and developing then. Here we will be patching up not just any instrument, but the crown jewel of the resistance metrology field – Measurements International 6010B 9½-digit DCC bridge. 6010B is a predecessor from 1997 of today’s modern Model 6010D improved version.

Metrology lab targeted bridge system like 6010 in 99.9% of target usage cases is controlled remotely via control program over GPIB bus. But in rare case when operator needs to run quick check or verify good connections to resistance standards user can find onboard LCD handy. However, here is a weak point in such case if factory-made backlight got faulty due to age of some older instruments.

Older 6010 bridges using miniature incandescent light bulb for providing backlight. This backlight is quite fragile and with 25-year old obsoleted instrument like 6010B chances for dead lamp or near failing one are high. It would be hard or next to impossible to find exact to-spec replacement for original bulb today. But not all is lost and we can rectify the situation with new LED-backlit high contrast display instead.

This would give more user enjoyment out of older but still perfectly capable instruments. Keep in mind that LCD replacement procedure and steps in this guide are shown only as simple example on what can be done. It is not the only possible solution, but perhaps rather easy one.

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MIL 6010B build is very modular and mechanically well designed. Front panel MIL 6010B can be detached from chassis by removing four screws on the sides. 6010 units have LCD, backlight and keypad are mounted on front panel metalwork.

Original display was manufactured by Japanese manufacturer AND, Model AND711AST-30. This is 240 × 64 pixel dot matrix STN graphical display. Display is based around T6963C controller and has +5 VDC standard parallel I/O interface.

This display does not have integrated backlight but has optional special option for electroluminescent backlight (-EO suffix). Measurements International didn’t go for electrically noisy high-voltage electroluminescent backlight. Instead they went for linear low voltage incandescent bulb in aluminum reflective/heatsink focused on very cool looking multi-fiber optical cable to spread light into LCD light diffuser.

Optical cable receiver end is fixed into tight bunch with white cement and mounted in brass tube. This tube is further mounted into lamp assembly carrier (it’s shown on Image 13).

Each strand on fiber cable is edged and polished to perfectly flat surface to have good light transmission from light source to backlight module in LCD.

Fiber optical cable edge have typical temperature around +49 °C and fiber exit at +34 °C. This whole assembly is quite a hot source, but it is located far from any precision metrology circuits or boards, so it does not affect actual DCC operation in any bad way.

To match style of light-blue Measurements International instruments and latest 6010D negative white display used. We got few mechanically and most important, electrically compatible RA6963-based EastRising ERM24064DNS-1 LCDs. These modules available for inexpensive $28 USD and have very close dimensions to AND original LCD used by factory.

New module have very similar mechanical dimensions, but does not match old display perfectly. It need small amount of alignment in position for good centering. I did not want to modify original mounts or frame thus can live with few millimeters off ideal position.

Displays I’ve got did not have connector populated. It is just standard 2.54mm pitch dual row 22-pin header, so any standard connector fits fine there.

MIL 6010 use 20-conductor flat ribbon cable to interface with LCD. Pins 21 and 22 used for backlight power. These need to be connected to +5V power source by user.

First we need to provide power to white LED backlight. Power measurement on my display sample revealed current draw around +110 mADC at supplied +5.00 VDC.

This is in line with datasheet specification, but I feel like bit smaller backlight power might be actually better. Jumping ahead, 6010B with new display is brightest instrument in the lab at night now. :)

Next modification is LCD contrast adjustment. Measurements International 6010B bridge does not allow user programmable LCD contrast change. We have to do it the hardware way. Contrast is controlled by bias from small negative supply and simple R3/R4 divider network. One way is to change values of R3 or R4 resistors on LCD PCB. Or alternative path, also recommended in interfacing document supplied with LCD is to connect multi-turn 10 kΩ trim potentiometer between negative supply (pin 20, marked orange on Image 12) and ground (marked blue on Image 12). Trim-pot was soldered directly to -15V and GND pads available at R3, R4 and all needed is good fixed contrast setting.

After modifications on LCD completed, install it into unit. Make sure to insulate exposed 4.2 VAC pin header and wire used for old lamp power. I didn’t remove original lamp assembly and holder, you can still see it on Image 12.

It is not affecting anything now and just sits there unpowered, in case we ever want to revert MIL 6010B back to factory condition and original display.

Make sure flat ribbon cable connected in proper orientation. Usually it is already previously bent from original display connection. Next is check everything, do a first power on. It is good time now to adjust contrast on display for desired viewing angles before closing everything together.

If everything works correctly, put front panel frame with new display back on 6010B frame and confirmed with success test, reassemble instrument back together.

Setup some benchmark tests to verify performance of resistance transfers after reassembly too. Since we did not alter anything on analog side of the bridge, there should not be any effects on bridge performance.

Such LCD replacement was easy and quick improvement of expensive and rare instrument. Hopefully this brings an example on how obsolete old parts can be replaced with modern technology, bringing second life to instruments we all love.

Our new line of 10.1” TFT displays with IPS technology are now available! These 10.1” IPS displays offer three interface options to choose from including RGB, LVDS, and HDMI interface, each with two touchscreen options as capacitive or without a touchscreen.

The new line of 3.5” TFT displays with IPS technology is now available! Three touchscreen options are available: capacitive, resistive, or without a touchscreen.

EO here, and this week, I’m here to give you an in depth look into how our MD Select series is created, all the way from a RAW LCD to a finished product that ends up on your workbench.

We have our own factory in Shenzhen with about 60 employees where we produce our LCD screens, add small parts like camera brackets and proximity sensor brackets, and even create our packaging and boxing materials. On an average day, we’re producing 2,000-3,000 LCD screens. Having everything under one roof proves to be extremely advantageous in reducing defects at the source.

All production starts with a team member running the raw LCDs through an electron microscope. They do this to check the sub-pixels throughout each LCD for consistency and accuracy before they’re cleared to enter the main production line.

These are put into a machine where the first IC get installed. This IC is the driver for the sub-pixels on the LCD which obtains information from the logic board on what to display. Each device model uses a different drive IC even though the LCD glass may be the same. The driver IC is bonded to the LCD glass with a special conductive adhesive called ACF. After this, the LCD flex cable is installed with another ACF machine. The assembled LCDs are then tested prior to proceeding in the production process.

The next step in the production process involves marrying the digitizer and outer glass assembly that was just created with the LCD assembly that was created earlier.

Coming into the other end of the line, the assemblies start to become more familiar. Here, depending on the model, the digitizer may need to be bonded to the LCD flex. Then the display assembly is tested again to ensure proper function. The final step in completing the display assembly involves adding the backlight. For models with 3D-Touch, the backlight assembly includes the 3D-Touch sensor and home button connection.

The last step of the assembly process in the factory line involves the frame installation. Years ago there were industry-wide issues involving frame separation in iPhone screens, but we’re happy to say that it’s just a piece of history now. You’ll find an automated torch making its way around a raw frame. The flame passes over the surface extremely quickly, but this process leaves just the top layer of the plastic chemically altered to help it bond with the adhesive that is installed in the next step.