how to test lcd screen made in china

Since the iPhone 7/7 Plus has been released for quite a long time, finally the China made iPhone 7/7 Plus screen replacementscame out in the market. we’ve got some iPhone 7 series LCD screen replacements samples and done some tests on them, now let’s take a closer look at these new iPhone 7 series LCD screen replacements!(TianmaandLGsources for testing)

After installing all the sample screens to the iPhone 7/7 Plus rear housing assembly, we found that all the China made iPhone 7 series screen replacements are fitting well just like the original ones - the home button fits well, the screen assembly and the rear housing also fits well.

From the picture below, we can see that there is no difference between the China made iPhone 7 series display and the original ones, however, back to the rear side, we can easily figure out which one is which, cause the original one has Apple logo on it while the China made screen has none.

By comparing these two iPhone 7 screens, we can find that the screen flex cables are much different, there are extra IC on the China-Made iPhone 7 screen while the original one has none. And the original iPhone 7 series screen flex cable is integrated together while on the China-Made iPhone 7 series screen the touch function flex cable is soldered to the display and 3D touch flex cable.

Another difference between the original and China made iPhone 7 screen replacements is the exposed IC on the after-market iPhone screen, just like other China-Made iPhone 5 or 6 series screen replacement, which has more potential risk of electrostatic damage and more likely to get damaged and this problem needs to be improved.

During our test, we found that the display color between our after-market iPhone 7 screen and original screen seems a little different although they are not effecting the touch function. And to be honest, there may have some black dots on the screen because of impurities within the screen module when laminating the LCD and backlight together, without any doubt, this can be solved with technical improvement.

The screen touch sensitivity is another big concern for all of us, luckily, during our test, almost all home button and touch functionality on both iPhone 7 and 7 Plus works well, except one piece of iPhone 7, the 3D touch function is not acting so well on the central part of the screen.

The China-Made iPhone 7 series LCD screen assembly replacement still remains to be improved in quality and performance compared to the original ones, the exposed IC, heavier screen flex cable ribbon, and the screen color difference, the touch function stability, although the price is attractive. However, the China made iPhone 7 series screen replacement is under the improvement, and sooner or later their quality and performance can be quite close to original ones and acceptable, if you"re going to stock up some non-original iPhone 7 series LCD screen replacement, pay more attention and we’ll keep you updated with further information about after-market iPhone 7 series screen replacement!

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Mandy, ETS is obviously a company that you are connected to and this could easily be taken for spam. I think we can make an exception at this time since you are asking a good market research question that may be useful to many.

Having checked out your video, I personally will not use the aftermarket screen as a replacement for my X. It just doesn"t have what I expect for a $1000 USD phone. I recognize that $300 USD for a replacement is hefty but the aftermarket screen does not appear to have the quality that I would expect for my phone.

To learn more about best practices on handling and using a Dell laptop, see the Dell knowledge base article Best Practices for Product Use and Handling for Dell Laptops.

WARNING: Use of controls, adjustments, or procedures other than what is specified in the User Manual may result in exposure to shock, electrical hazards, and/or mechanical hazards.

To learn more about safety instructions, see the Dell knowledge base article Safety Precautions When Working with Electronic and Electrical Equipment.

If the screen abnormality is not present in the built-in self-test mode, see the Dell knowledge base article How to Troubleshoot Display or Video Issues on a Dell Monitor.

If the LCD built-in self-test (BIST) diagnostic test passed, the laptop LCD screen is working correctly. The display problem could be due to an outdated graphics driver or incorrect video settings. Follow the troubleshooting instructions in the Dell knowledge base article How to Troubleshoot Display or Video Issues on a Dell Laptop.

All the test procedures were analyzed in detail with opinions proposed. Now, let’s take a close look to the first China madeiPhone 7 Plus LCD Screen sample with professional testing report below.

To analyze inside layers of the iPhone screen, we tear it down layer by layer .The sample China made screen applies G + G layer structure, there is a glass base touch layer,

The quality and performance is quite close to OEM and acceptable, and sure it will come with impressive lower price offer. The display panel is China made with G + G layer structure, and the screen is assembled with a third-party driver IC solution.

Otherwise, without such Approval, even if the goods have arrived at the China Customs, they will not be cleared normally, and the goods will be detained in the port till get such approval, or even be returned, causing you huge losses.

Shenzhen Startek Electronic Technology Co., Ltd. mainly provides their clients with the service of designing LCD panels. Their company is committed to the customization service, R&D, sale and after-sales service of LCD and TFT display products. At present, Shenzhen Startek Electronic Technology Co., Ltd. company has a team of more than 100 employees. Shenzhen Startek Electronic Technology Co., Ltd’s product are widely used in PDA, Telecommunication terminals.

This company specialized in Mobile Phone Parts and Accessories. Guangzhou Taoyuan Electronic Technology Co., Ltd is a professional manufacturer and exporter specialized in the mobile phone accessories industry. This is located in Guangzhou, China. They have over 10 years of experience in LCD screen factory, and five years’ experience in exporting. Products cover a wide range of repair parts and accessories for Apple and other devices.

Shenzhen City Mingxinhui Technology Co., Ltd.company is engaged in the import and export business of electronic intelligent equipment, digital products, electronic components, wireless headphones, and etc. They manufacture the best quality LCD screen and offer at friendly and affordable rates.

Qingdao Miko Technology Company Ltd. implementing strict quality control. They have an independent department and testing standard for checking the safety and quality of their products. High quality is the first criterion of their purchasing team. Qingdao Miko Technology Company Ltd. is a professional LCD screen manufacturer.

SZ Xianheng Technology Co., Ltd. is an industrial LCD display solutions provider, through high-quality LCD screen products and display driver program for the display and touch control terminal device. So far their products have been widely used in medical, military, intelligent transportation, finance, security, electricity, industry and other industries.

Shenzhen U-Chance Electronic Technology Co., Ltd. was established in 2007 and is located in Shenzhen China, which have the biggest electric market in Asia. Their main business product include: Mobile phone LCD screen display, Touch screen, Flex cables, Phone parts, Phone charger and data line, Phone case and other repair parts.

Shenzhen Yunlea Electronics Co., Ltd. company is located in Shenzhen city, 5km away from Shenzhen airport. They team has nearly 10 years of experience. They pay close attention to developments in worldwide touch display field, and set up good cooperation partnership with many first-class manufacturers and raw materials suppliers.

Guangzhou Shooan Electronic Technology Co., Ltd. is a trusted manufacturer and LCD screen supplier. They strength lies in understanding the special needs of clients, to provide the most suitable products and professional technical supports. Guangzhou Shooan Electronic Technology Co., Ltd. is your one stop solution. They have over 10 years’ sales experience in the phone LCD screen.

Guangzhou Yingyi Electronic Co.,LTD is focus on developing and supplying in LCD Assembly, all flex cable, tempered glass protector, protector case, glass, usb cable, back cover and other spare parts in repairing for mobile phone. They can able export to the worldwide. They have a professional team with good after-sales service.

Truemax Electronics Co., Limited, specializes in suppling all kinds of Mobile Parts & Accessories. It is a serious company, which has gained lots of Trust, Reputation & Support from our customers all over the world. They honor customers including Distributors, Repairing Centers, Mobile Assemblers, E-bay Shop Owners, Online Sellers etc.

BOE Technology Group Co., Ltd. is the famous chinese 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.

The main products of Beijing STONE technology co., LTD company are industrial electronic series, advanced series, and civil and commercial series. They focus on the development and production of china HMI LCD display manufacturers, production and sales of LCD display modules for 16 years. The company master TFT LCD technology and software system.

The company serves the consumer display market of the mobile terminal and professional display market. Its products are widely used in many fields such as smartphone, tablet computer, smart wear, car display, medical display, industrial control, aviation display, and smart home. They also provide the best product experience for customers through TIANMA and NLT brands.

Xinli optoelectronics co., LTD is a professional development, production and sales of capacitive touch, micro camera module and integrated touch module products. The quality for their products are widely recognized and trusted by many customers from the worldwide. They can provide your desirable LCD screen.

Shenzhen sanlong electronics co., LTD  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 DVD, video phone, intercom doorbell, car video, industrial control medical and other fields.

TCL display technology (Huizhou) co., LTD company is committed to the r&d, production and sales of TFT-LCD 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.

Tian Yi fu electronics co., LTD 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. All products will be tested and make sure all work before shipment. They also offer a satisfying and excellent services.

Jiangmen yidu semiconductor co., LTD is 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. They manufacture outstanding and great LCD screen. You can truly trust and rely for this company. This is one of the leading LCD screen manufacturer.

The company integrates research and development, design, production, sales, and service into one. They have full capability to provide comprehensive touch and display integrated solutions for the complete machine display manufacturers of smart phones, specializing in the development and manufacture of Sensor sensors, capacitive touch screens.

Note:①After the test under the above reliability conditions, the specimen should be stored in a standard environment for 24 hours before the functional test is OK.②The reliability test should be performed with no D.C. power supplied and the touch panel stored on the flat plate.③The standard condition presents 25±10°C of the temperature, 55±30%of the relative humidity, and 96±10 kPa of the atmospheric pressure.④The reliability test should be performed on the touch panel by itself.

2. G+P plastic sheet capacitive screen will harden and change color under the action of acid-base oil, there will be obvious "white spots" and "aerosol", and the screen resolution will be reduced.

A:Projected capacitive touch panel can support multi-touch,but surface capacitive touch panel only support single point touch. And the projected capacitive touch panel can support touch with glove, can be operated through a layer of cover glass.

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Not too long ago, we’ve just got some samples of the new China Made iPhone 6 LCD Display. No doubt that this will be another option for all who are suffering from the high price of the iPhone screens. Let’s take a deep look of these screens.

At the moment, there are two companies producing the iPhone 6 LCD screens, one is LT, the other one is JDF (no iPhone 6 screens made by TM are available now). Below are some detailed comparisons after our tests.

When taking a closer look at both of the LT and JDF iPhone 6 screens under direct light, you’ll see the digitizer textures. While for the original screen, the textures had been hidden by a special painted layer.

The glass lens of LT made iPhone 6 screen is far too thin compared with the original one, which can’t secure the display well. At the same time, thinner glass lens will make the home button stick up above the screen. While for the JDF made the screen, a plastic layer has been added to make it thicker.

It’s hard to be realized through eyes, but it’s easily to be touched. When you grab the iPhone 6 with LT made screen, it’s hard to ignore that annoying uncomfortable feeling. At this point, the JDF made screen is much better.

High and low temperature tests have been applied to both the LT and JDF iPhone 6 screens. Both of them have survived and worked well after been putted in a 55 centi degrees room for 2 hours and -5 centi degrees room for 2 hours.

Through our tests, the first version of both the LT and JDF displays are not good choices for the repair industry. The obvious color differences, thickness differences still need to be improved. If you have any questions regarding the LT/JDF iPhone 6 screens, please leave your comment below, we’ll try our best to answer it.

Important technical improvements of LCD, such as LED backlighting and wide viewing Angle, are directly related to LCD. And account for an LCD display 80% of the cost of the LCD panel, enough to show that the LCD panel is the core part of the entire display, the quality of the LCD panel, can be said to directly determine the quality of an LCD display.

The production of civil LCD displays is just an assembly process. The LCD panel, the main control circuit, shell, and other parts of the main assembly, basically will not have too complex technical problems.

Does this mean that LCDS are low-tech products? In fact, it is not. The production and manufacturing process of the LCD panels is very complicated, requiring at least 300 process processes. The whole process needs to be carried out in a dust-free environment and with precise technology.

The general structure of the LCD panel is not very complex, now the structure of the LCD panel is divided into two parts: the LCD panel and the backlight system.

Due to the LCD does not shine, so you need to use another light source to illuminate, the function of the backlight system is to this, but currently used CCFL lamp or LED backlight, don’t have the characteristics of the surface light source, so you need to guide plate, spreadsheet components, such as linear or point sources of light evenly across the surface, in order to make the entire LCD panel on the differences of luminous intensity is the same, but it is very difficult, to achieve the ideal state can be to try to reduce brightness non-uniformity, the backlight system has a lot to the test of design and workmanship.

In addition, there is a driving IC and printed circuit board beside the LCD panel, which is mainly used to control the rotation of LCD molecules in the LCD panel and the transmission of display signals. The LCD plate is thin and translucent without electricity. It is roughly shaped like a sandwich, with an LCD sandwiched between a layer of TFT glass and a layer of colored filters.

LCD with light refraction properties of solid crystals, with fluid flow characteristics at the same time, under the drive of the electrode, can be arranged in a way that, in accordance with the master want to control the strength of the light through, and then on the color filter, through the red, green, blue three colors of each pixel toning, eventually get the full-screen image.

According to the functional division, the LCD panel can be divided into the LCD panel and the backlight system. However, to produce an LCD panel, it needs to go through three complicated processes, namely, the manufacturing process of the front segment Array,the manufacturing process of the middle segment Cell, and the assembly of the rear segment module. Today we will be here, for you in detail to introduce the production of the LCD panel manufacturing process.

The manufacturing process of the LCD panel Array is mainly composed of four parts: film, yellow light, etch and peel film. If we just look at it in this way, many netizens do not understand the specific meaning of these four steps and why they do so.

First of all, the motion and arrangement of LCD molecules need electrons to drive them. Therefore, on the TFT glass, the carrier of LCD, there must be conductive parts to control the motion of LCD. In this case, we use ITO (Indium Tin Oxide) to do this.ITO is transparent and also acts as a thin-film conductive crystal so that it doesn’t block the backlight.

The different arrangement of LCD molecules and the rapid motion change can ensure that each pixel displays the corresponding color accurately and the image changes accurately and quickly, which requires the precision of LCD molecule control.ITO film needs special treatment, just like printing the circuit on the PCB board, drawing the conductive circuit on the whole LCD board.

First, the ITO film layer needs to be deposited on the TFT glass, so that there is a smooth and uniform ITO film on the whole TFT glass. Then, using ionized water, the ITO glass is cleaned and ready for the next step.

Next, a photoresist is applied to the glass on which ITO film is deposited, and a uniform photoresist layer is formed on the ITO glass. After baking for a period of time, the solvent of the photoresist was partially volatilized to increase the adhesion of the photoresist material to the ITO glass.

Ultraviolet light (UV) is used to illuminate the surface of the photoresist through a pre-made electrode pattern mask, which causes the photoresist layer to react. The photoresist is selectively exposed under ultraviolet light by covering the photoresist on the glass coated with the photoresist.

The exposed part of the photoresist is then washed away with the developer, leaving only the unexposed part, and the dissolved photoresist is then washed away with deionized water.

Then etch off the ITO film without photoresist covering with appropriate acid etching solution, and only retain the ITO film under the photoresist. ITO glass is conductive glass (In2O3 and SnO2). The ITO film not covered by photoresist is easy to react with acid, while the ITO film covered by photoresist can be retained to obtain the corresponding wire electrode.

Stripping: High concentration of alkali solution (NaOH solution) is used as a stripping solution to peel off the remaining photoresist on the glass so that ITO glass can form ITO graphics exactly consistent with the photolithography mask.

Rinse the basic label of glass with an organic solution and remove the photolithographic tape after reaction to keep the glass clean. This completes the first thin-film conductive crystal process, which generally requires at least five identical processes to form a complex and sophisticated pattern of electrodes on the glass.

This completes the previous Array process. It is not difficult to see from the whole process that ITO film is deposited, photoresist coated, exposed, developed, and etched on TFT glass, and finally, ITO electrode pattern designed in the early stage is formed on TFT glass to control the movement of LCD molecules on the glass. The general steps of the whole production process are not complicated, but the technical details and precautions are very complicated, so we will not introduce them here. Interested friends can consult relevant materials by themselves.

The glass that the LCD board uses makes a craft also very exquisite. (The manufacturing process flow of the LCD display screen)At present, the world’s largest LCD panel glass, mainly by the United States Corning, Japan Asahi glass manufacturers, located in the upstream of the production of LCD panel, these manufacturers have mastered the glass production technology patents. A few months ago, the earthquake caused a corning glass furnace shutdown incident, which has caused a certain impact on the LCD panel industry, you can see its position in the industry.

As mentioned earlier, the LCD panel is structured like a sandwich, with an LCD sandwiched between the lower TFT glass and the upper color filter. The terminal Cell process in LCD panel manufacturing involves the TFT glass being glued to the top and bottom of a colored filter, but this is not a simple bonding process that requires a lot of technical detail.

As you can see from the figure above, the glass is divided into 6 pieces of the same size. In other words, the LCD made from this glass is finally cut into 6 pieces, and the size of each piece is the final size. When the glass is cast, the specifications and sizes of each glass have been designed in advance.

Then, the organic polymer directional material is coated on the surface of the glass, that is, a uniform directional layer is applied to the appropriate position of ITO glass by the method of selective coating. Meanwhile, the directional layer is cured.

Directional friction:Flannelette material is used to rub the surface of the layer in a specific direction so that the LCD molecules can be arranged along the friction direction of the aligned layer in the future to ensure the consistency of the arrangement of LCD molecules. After the alignment friction, there will be some contaminants such as flannelette thread, which need to be washed away through a special cleaning process.

After the TFT glass substrate is cleaned, a sealant coating is applied to allow the TFT glass substrate to be bonded to the color filter and to prevent LCD outflow.

Finally, the conductive adhesive is applied to the frame in the bonding direction of the glass of the color filter to ensure that external electrons can flow into the LCD layer. Then, according to the bonding mark on the TFT glass substrate and the color filter, two pieces of glass are bonded together, and the bonding material is solidified at high temperatures to make the upper and lower glasses fit statically.

Color filters are very important components of LCD panels. Manufacturers of color filters, like glass substrate manufacturers, are upstream of LCD panel manufacturers. Their oversupply or undersupply can directly affect the production schedule of LCD panels and indirectly affect the end market.

As can be seen from the above figure, each LCD panel is left with two edges after cutting. What is it used for? You can find the answer in the later module process

Finally, a polarizer is placed on both sides of each LCD substrate, with the horizontal polarizer facing outwards and the vertical polarizer facing inwards.

A polarizer is an optical plate that allows only light from a certain direction to pass through. It is an optical element that converts natural light into straight polarized light. The mechanism of action is to make the vertical direction light pass through the straight incident light after passing through the vertical polarizer, and the other horizontal direction light is absorbed, or use reflection and scattering and other effects to make its shade.

When making LCD panel, must up and down each use one, and presents the alternating direction, when has the electric field and does not have the electric field, causes the light to produce the phase difference and to present the light and dark state, uses in the display subtitle or the pattern.

The rear Module manufacturing process is mainly the integration of the drive IC pressing of the LCD substrate and the printed circuit board. This part can transmit the display signal received from the main control circuit to the drive IC to drive the LCD molecules to rotate and display the image. In addition, the backlight part will be integrated with the LCD substrate at this stage, and the complete LCD panel is completed.

Firstly, the heteroconductive adhesive is pressed on the two edges, which allows external electrons to enter the LCD substrate layer and acts as a bridge for electronic transmission

Next is the drive IC press. The main function of the drive IC is to output the required voltage to each pixel and control the degree of torsion of the LCD molecules. The drive IC is divided into two types. The source drive IC located in the X-axis is responsible for the input of data. It is characterized by high frequency and has an image function. The gate drive IC located in the Y-axis is responsible for the degree and speed of torsion of LCD molecules, which directly affects the response time of the LCD display. However, there are already many LCD panels that only have driving IC in the X-axis direction, perhaps because the Y-axis drive IC function has been integrated and simplified.

The press of the flexible circuit board can transmit data signals and act as the bridge between the external printed circuit and LCD. It can be bent and thus becomes a flexible or flexible circuit board

The manufacturing process of the LCD substrate still has a lot of details and matters needing attention, for example, rinse with clean, dry, dry, dry, ultrasonic cleaning, exposure, development and so on and so on, all have very strict technical details and requirements, so as to produce qualified eyes panel, interested friends can consult relevant technical information by a search engine.

LCD (LC) is a kind of LCD, which has the properties of light transmission and refraction of solid Crystal, as well as the flow property of Liquid. It is because of this property that it will be applied to the display field.

However, LCD does not emit light autonomously, so the display equipment using LCD as the display medium needs to be equipped with another backlight system.

First, a backplate is needed as the carrier of the light source. The common light source for LCD display equipment is CCFL cold cathode backlight, but it has started to switch to an LED backlight, but either one needs a backplate as the carrier.

CCFL backlight has been with LCD for a long time. Compared with LED backlight, CCFL backlight has many defects. However, it has gradually evolved to save 50% of the lamp and enhance the transmittance of the LCD panel, so as to achieve the purpose of energy-saving.

With the rapid development of LED in the field of lighting, the cost has been greatly reduced.LCD panels have also started to use LED as the backlight on a large scale. Currently, in order to control costs, an LED backlight is placed on the side rather than on the backplate, which can reduce the number of LED grains.

However, no matter CCFL backlight or LED backlight is placed in various ways, the nature of the backlight source cannot be a surface light source, but a linear light source or point light source. Therefore, other components are needed to evenly distribute the light to the whole surface. This task is accomplished by the diffuser plate and diffuser plate.

On the transparent diffuser plate, point-like printing can block part of the light. The LED backlight on the side drives the light from the side of the diffuser plate, and the light reflects and refracts back and forth in the diffuser plate, distributing the light evenly to the whole surface. Point-like printing blocks part of the light, screening the light evenly like a sieve.

At the top of the diffusion plate, there will be 3~4 diffuser pieces, constantly uniform light to the whole surface, improve the uniformity of light, which is directly related to the LCD panel display effect. Professional LCD in order to better control the brightness uniformity of the screen, panel procurement, the later backlight control circuit, will make great efforts to ensure the quality of the panel.

The backlight system also includes a backlight module laminator, located behind the backplane. In the CCFL backlight era, you can often see the long strip laminator like the one above, with each coil responsible for a set of tubes.

However, it is much simpler to use a side white LED as a backlight. The small circuit board on the far left of the figure above is the backlight of the LED.

Since the LCD substrate and the backlight system are not fixed by bonding, a metal or rubber frame is needed to be added to the outer layer to fix the LCD substrate and the backlight system.

After the period of the Module, the process is completed in LCM (LCDModule) factory, the core of this part of the basic does not involve the use of LCD manufacturing technology, mainly is some assembly work, so some machine panel factories such as chi mei, Korea department such as Samsung panel factory, all set with LCM factories in mainland China, Duan Mo group after the LCD panel assembly, so that we can convenient mainland area each big monitor procurement contract with LCD TV manufacturers, can reduce the human in the whole manufacturing and transportation costs.

However, neither Taiwan nor Korea has any intention to set up factories in mainland China for the LCD panel front and middle manufacturing process involving core technologies. Therefore, there is still a long way to go for China to have its own LCD panel industry.

Please note: This S300 device updated to latest S800 testbox which more powerful and price close, so S300 will stop selling soon, so if you want to buy S300 testbox we advice to buy S800 device from our website.

This is a 6in1 S300 test box that supports screens for iPhone Samsung Huawei Oppo Vivo and Xiaomi. Update to 2022-12-31, it has 271flex cables that support 567different models.

System version after 2022-11-07 there is an important update that system file for Oppo Vivo and Xiaomi will be put in USB disk to save storage to have more useful functions for S300 device. To be short, after updating this version, the device includes system files for iPhone Samsung Huawei only, if you want to test screens for Oppo vivo and xiaomi as well then you need to connect USB disk when testing these screens, if only need to test screens for iPhone Samsung Huawei then no need to connect USB disk.

It has an extra display on test box which you can see the screen voltage and currency itself, from this function you will be able to find whether screen get some problem

Market many people sell TFT LCD as OLED screens, as their currency is different so you will be able to find whether they are selling fake OLED while it is a TFT screen.

S300 can test touch panel only which means if the inner LCD broke you can switch to the “tp test only” model and test whether its touch panel is able to recycle. And still, as touch panel testing only model you can identify 8 Plus and below from Incell structure to other qualities.

If you bought an S300 box before, you can update the system to support all these models for iPhone Huawei and Samsung Screens, just buying a flex cable set is fine.