1. Methods for repairing mobile phone screens



1. Replace the outer screen (press screen) using equipment



Screen pressing is a common method for repairing broken mobile phone screens, primarily targeting repairs to the outer glass layer of the screen. Since it involves repairing the outer screen, the inner screen of your phone must be intact before this method can be applied. Screen pressing involves reattaching the new outer glass layer and display layer together, and then using professional equipment to press them together, ensuring they are tightly combined. The advantage of this method is that the repair cost is relatively low, and once repaired, it will not affect other functions of the phone.




However, it should be noted that screen pressing requires professional equipment and technology, which cannot be operated by ordinary repair shops, and it is also impossible to press the screen by oneself.





2. Replace the entire screen



If our phone screen is severely damaged and the internal screen is already damaged (screen display is abnormal, screen leakage, lines, black screen), then we need to consider replacing the screen.



Screen replacement is the process of removing the entire screen and replacing it with a new one. The advantage of this method is that it can completely solve the problem, but the price of the original screen is relatively high, and reliable repairers need to be found to ensure the quality of the screen.



2、 The price for changing the screen

The price of screen replacement varies depending on the brand, model, and repair method. Generally speaking, if only the external screen is damaged, we only need to find a professional repair shop to replace the external screen.
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If the internal screen is damaged, replacing the original screen may be more expensive. If you have high requirements, you can directly replace it with an original screen assembly. If the requirements are not very high, you can replace it with a brand screen assembly. If it is only a spare machine or just wants to export data, you can directly replace it with an assembled screen.





In addition, it is recommended to choose to have your phone screen repaired in store or by mail. Some home repair and screen replacement services often use an assembled screen to replace your original screen, especially if your phone only has a broken external screen. When replacing a phone screen, don't just look at the price. The price of replacing the external screen is closely related to the repair techniques of the technician. Some cheap repair shops have many tricks for replacing the external screen, such as not bearing the risk of the internal screen, which will ultimately lead to the price of repairing the screen increasing several times. The same goes for replacing the screen assembly. There are assembled screens, branded screens, press fit screens, face change screens, original disassembled screens, original touch screen replacement, screen replacement, and so on in the market. Anyway, remember that you get what you pay for. When repairing a screen, try to go to a store that only does repairs. For those who are not familiar with screens, please contact me. We can provide wholesale and after-sales services for various screens。Tina WhatsApp:+86 13824303378





In summary, if your phone screen is damaged and only the external screen is broken, we only need to replace the external screen. If the internal screen is damaged, we need to replace the entire screen assembly. We can choose the appropriate repair method according to our own situation. At the same time, when choosing a repair shop, it is necessary to choose a reliable merchant to ensure the quality and effectiveness of the repair.

Comparison of Three Packaging Technologies


1. COG (Chip On Glass): This is one of the most traditional packaging methods, with low technical barriers and low costs, and is the most commonly used technology for screens. From the English version, it can also be seen that this packaging method involves placing IC chips and FPC cables on the back glass of the screen. However, due to the IC chip being located directly below the LCD, a considerable amount of screen space is squeezed, inevitably resulting in a "chin".




2. COF (Chip On Film): Essentially, it is an upgraded version of COG and a key factor in the current screen transformation. The main principle is to place the display driver IC chip into a flexible FPC cable, and then fold it under the screen using the characteristics of the FPC itself. Specifically, through hot pressing, the Gold Bump of the IC chip and the Inner Lead on the flexible substrate circuit will be bonded together. Due to the release of space occupied by IC chips, the lower frame width can generally be reduced by at least 1.5 millimeters.






3. COP (Chip On Pi): It belongs to the process with the most reduced borders, but it should be emphasized that the premise of this process is the application of flexible OLED screens, which utilize the bending characteristics of flexible OLEDs to bend all cables and ICs below the screen. Of course, OLED is also divided into two types: hard screens and flexible screens. To use this technology, a combination of COP packaging technology and flexible OLED must be used. However, this technology still has the disadvantages of high cost and low yield rate.





After introducing the technical foundations of COG, COF, and COP, let's take a look at the practical application of COP technology on Samsung S8. This phone adopts innovative COP screen packaging technology, which allows the screen edges to bend without physical limitations, achieving a nearly borderless visual effect. This technology not only enhances the aesthetic appearance of mobile phones, but also brings them a wider display space.

Collaborative innovation, industry university research collaboration to forge the technological highland of "Chinese screen"

As a leading Chinese enterprise in the AMOLED field, Vishino has always been driven by technological innovation and has joined forces with Tsinghua University and domestic material manufacturers to launch technological breakthroughs in the field of OLED material devices. After years of research and development, the company has successfully overcome key technological bottlenecks and released the fourth generation pTSF material device system. This system has been comprehensively upgraded from three dimensions: luminous efficiency, color gamut coverage, and device lifespan. It not only achieves purer color presentation, lower energy consumption, but also extends screen lifespan. It has officially been put into mass production and commercial use, adding core chips to the competition of "Chinese screens" in the global market.

Technological breakthrough, redefining AMOLED performance benchmark

In the development process of OLED technology, how to simultaneously achieve high efficiency, long lifespan, and high color purity of OLED has always been an important research issue. Compared to traditional OLED devices, the fourth generation pTSF device technology introduces multiple energy transfer modes, ultimately emitting light from a fluorescent emitter, achieving 100% internal quantum efficiency utilization. Moreover, the exciton lifetime of devices using pTSF technology has achieved a leap from microseconds to nanoseconds, suppressing exciton annihilation and quenching processes within the device, thereby achieving higher efficiency and longer lifetime, as well as higher color purity.

As the "barometer" of the global display industry, the SID exhibition in 2025 saw Vishino launch high-efficiency pTSF device products and wide color gamut pTSF device screens globally, which attracted widespread attention in the industry for their performance. Data shows that screens equipped with high-efficiency pTSF devices reduce power consumption by over 12% and increase lifespan by 15% compared to traditional devices. Taking a smartphone with a daily battery life of 10 hours as an example, installing this screen can increase usage time by an additional 1.2 hours, effectively solving the pain point of "fast screen power consumption" in mobile devices. The wide color gamut pTSF device body has achieved breakthroughs in color reproduction, covering DCI-P3 color gamut (>99.5%) and Adobe RGB color gamut (>99.5%), with color accuracy reaching professional design level, meeting the needs of professional scenarios such as image creation and graphic design, while reducing energy consumption by more than 6% and increasing lifespan by 20%. At present, high-efficiency pTSF devices have completed mass production and begun to be applied in various mobile electronic devices in batches.

The technological breakthrough of Weixinnuo cannot be separated from the support of the industry university research collaborative innovation system. As a pioneer in China's OLED industry, the technological roots of Weixinnuo can be traced back to the OLED project team of Tsinghua University in 1996- it was this early technological exploration that accumulated a solid research and development foundation for the company. As of now, Weixinnuo has applied for over 20000 OLED related patents, with invention patents accounting for up to 89%. The patented technology covers the entire industry chain, including materials, devices, processes, and equipment, forming a complete technical protection system. In terms of industry standards and innovative achievements, Vicino has broken the monopoly of foreign enterprises: it is a Chinese enterprise that * formulates international standards for flexible displays, has won more than 20 global "*" innovative technologies and applications, more than 50 national "first" breakthroughs, and has also won the "first prize of the the State Technological Innovation Award" of the display industry *, becoming the "synonym" of China's display technology innovation.

In November 2024, Professor Duan Lian from Tsinghua University gave a keynote speech on the improvement of OLED performance at the screen technology press conference held by Weixinnuo. The two sides had in-depth exchanges on the research and development details and application scenarios of pTSF technology, further deepening the cooperation between industry, academia and research. In fact, the breakthrough of pTSF technology is the result of long-term cooperation between the two parties. The advantages of Tsinghua University in the field of basic research complement each other's experience in industrialization, accelerating the process of technology from the laboratory to the market. Practice has proven that the advantages of pTSF technology in key indicators such as color purity, efficiency, and lifespan not only validate the effectiveness of industry university research collaborative innovation, but also provide a replicable model for the technological upgrade of "Chinese screens".

The mass production and commercialization of the fourth generation pTSF material device system by Visionor is not only an important leap forward for the company's own development, but also promotes the key transformation of "Chinese screens" from "technology *" to "product *", which is of milestone significance in the global display industry. This achievement marks that "Made in China" has completely shed its identity as a "follower" in the AMOLED field, and has become a "leader" in the industry through independent innovation. In the future, it will continue to promote technological changes in the global display industry, allowing "Chinese screens" to shine even brighter in the global market.

The rise of full lamination technology
The structure of a screen can be roughly divided into three parts: protective glass, touch screen, and display screen, which are arranged in sequence. To ensure the perfect presentation of the screen, it is usually necessary to perform two bonding operations: one between the protective glass and the touch screen, and the other between the display screen and the touch screen. And the film we are familiar with in daily life is actually the bonding process between the protective glass and the protective film. Although it may seem simple, it also requires exquisite bonding technology.

Screen bonding technology, according to its bonding method, is mainly divided into two categories: full bonding and frame bonding. Frame adhesive, also known as mouth glue bonding, refers to the simple fixation of the four sides of the touch screen and display screen through double-sided tape. This is the bonding method currently used by many display screens, which has the advantages of simple process and low cost. However, due to the presence of an air layer between the display screen and the touch screen, the refraction of light can affect the display effect, which is the main drawback of frame pasting technology.

Full lamination technology uses water-based adhesive or optical adhesive to completely stick the panel and touch screen together without any gaps. Compared to frame stickers, it provides a better display effect. The common full screen solutions in the market mainly come from OGS solutions from touch screen manufacturers, as well as On Cell and In Cell technology solutions led by panel manufacturers. The advantage of full lamination technology is that it eliminates the air layer between the screens, reduces the reflection between the display panel and glass, makes the screen more transparent, and thus improves the display effect of the screen. IMacs using full lamination technology can reduce reflection issues by up to 75%. In addition, full lamination technology can effectively prevent screen dust from entering and enhance the strength of the touch module. More importantly, it can significantly reduce the interference of display panel noise on touch signals.

Although full lamination technology has many advantages, its yield rate is relatively low, mainly due to the possible surface glass and panel loss during the lamination process. Therefore, controlling the defoaming and bonding yield has become the key to reducing costs.

In terms of full lamination technology, there are three main screen technologies: InCell, On Cell, and OGS. If frame pasting technology is used in the production process of mobile phone screens, it will seriously affect the display effect. And full lamination technology can significantly improve the yield rate, thereby reducing costs.



Different screen bonding technologies
In order to reduce the number of bonding cycles and improve the yield rate, several new development directions have emerged. Touch screen manufacturers mainly promote OGS/TOL solutions, while panel manufacturers are more inclined towards On Cell and In Cell technology solutions. These solutions can reduce the number of bonding times, save costs, and achieve the goal of lightweight.

In Cell technology is an innovative technique that embeds touch panel functionality into liquid crystal pixels. By embedding touch sensor functionality inside the display screen, the original three-layer structure (protective glass touch screen+display screen) has been optimized to two layers (protective glass+display screen with touch function), making the screen thinner and lighter. However, the research and development threshold for this technology is relatively high, mainly led by panel manufacturers.

Screen imaging principle
In the past, mobile phones had complex functions and rich details, but now, smartphones seem to be simplified into a single screen. We rely on this screen to operate and obtain information. The mobile phone screen displays colorful images through a combination of red, green, and blue pixels. With the development of technology, mobile phones are no longer limited to call functions, and the importance of screens has also become prominent. Whether watching videos, browsing pictures, or playing games, the screen carries the core content. Therefore, when choosing a smartphone, the screen often becomes an indispensable consideration for us.

However, are we really deep enough in our understanding of screens? When choosing a phone, we often only focus on screen size and resolution, but can these two really comprehensively measure the quality of the screen? In complex screen technology, which letter combinations truly reveal the material and panel technology of the screen? In fact, our misunderstanding of screens may be deeper than we imagine.

Unveiling the Technology and Principles of Mobile Screen

To present the text and images in our eyes, mobile phone screens rely on the three primary colors of red (R), green (G), and blue (B). Each pixel on the screen contains a complete RGB sub-pixel arrangement, and colors are recorded and expressed through RGB values. The RGB components of each pixel are within the intensity range of 0-255. It is through the different proportions of red, green, and blue that we can see a rich and colorful world.

Pixel, the color wizard of mobile phone screens

The colorful colors in our eyes are the clever combination of the three primary colors of red (R), green (G), and blue (B) on the screen. Each pixel contains a complete RGB sub-pixel arrangement, which creates a myriad of colors through different combinations of RGB values. Within the brightness range of 0-255, the proportional changes of the RGB three colors constitute the rich and colorful world in our eyes.



The comparison between 441ppi and 326ppi shows that the display effect of 441ppi on the left is more delicate and smooth.



After upgrading to 2K resolution, the screen's delicacy has reached a level that is difficult for the naked eye to distinguish. We have witnessed the continuous increase in screen resolution, which signifies that with the continuous advancement of technology, screens of the same size can now accommodate more pixels. By using PPI (pixel density) as an indicator, we can understand the number of pixels contained in each inch of the screen.

In the early days of the 1080p era of smartphones, we compared the screens of HTC Butterfly and iPhone 5, the world's first 1080p models. After capturing and zooming in on the screen with a macro lens, we found that the 441ppi HTC Butterfly surpassed the 326ppi iPhone 5 in terms of delicacy. This means that visually, the graininess on the screen is significantly reduced, and the overall display effect is more delicate and smooth. Nowadays, as mobile phone screens enter the 2K era, this level of delicacy has reached new heights, although it is still uncertain whether the naked eye can detect this change.

However, to comprehensively evaluate the quality of a mobile phone screen, relying solely on screen size and resolution is far from enough. These visible red, green, and blue small bright spots, also known as pixels, are undoubtedly the foundation, but they are only a part of screen display technology. The screen material and display technology also have a profound impact on the final visual effect.

LCD and OLED technology
In the current smartphone market, mainstream screen technologies can be divided into two categories: LCD and OLED.



LCD screens rely on backlighting during display, and light needs to pass through two layers of glass, a substrate, and various optical films, alignment films, color filters, and other components to produce polarization, which inevitably results in a loss of brightness and color. TFT, also known as thin-film transistor technology, is a key technology in LCD screens. It improves image quality by depositing a thin film as a channel area on a glass substrate.

In the TFT-LCD structure, the upper glass substrate is closely adjacent to the color filter, while the lower glass substrate is embedded with transistors. When current passes through a transistor, an electric field change is generated, causing liquid crystal molecules to deflect, thereby changing the polarization of light. Polarizers determine the brightness and darkness of pixels based on this polarity change. At the same time, the color filter attached to the upper layer of glass forms what we call RGB tri color pixels, which together constitute the colors and images displayed on the screen.



Subsequently, we will explore the types or panel technologies of LCD panels. LCD panels can be divided into two categories: simple matrix drive and active matrix drive. Among them, simple matrix driving mainly includes TN and STN technologies, while active matrix driving covers technologies such as TN, IPS, VA, and OCB. In the current smartphone market, TN and IPS technologies are more common, while VA technology is more commonly used in TV products.

TN screen, also known as Twisted Nematic (twisted nematic liquid crystal) screen, has been widely used since the emergence of liquid crystal technology and once dominated the field of electronic devices. However, nowadays many users mistakenly confuse TN screens with TFT screens, which is actually a misunderstanding of the two concepts. However, due to the mature production technology and affordable price of TN screens, they are still favored by some low-cost mobile phone brands. In addition, the high aperture ratio of TN screens makes them more energy-efficient compared to other technologies at the same brightness, and the response speed of 8-15ms is also quite fast. Therefore, although TN screens have shortcomings such as narrow viewing angles and color distortion, these advantages still make them occupy a place in the smartphone market.



IPS screen, also known as In Plane Switching (transverse electric field effect display technology), has significantly improved the color difference and narrow field of view problems of TN screens in poor viewing angles since its introduction in 1996 with its wide viewing angle technology. The electrodes of IPS liquid crystal are located in the same plane as the liquid crystal, thus achieving a wide viewing angle of 178 degrees up, down, left, and right. This breakthrough effectively overcomes the inherent defects of TN screens. However, IPS screens are not flawless. Despite its excellent viewing angle, it consumes relatively high power and has a slightly insufficient response speed, so it is necessary to weigh its pros and cons when using it.

Subsequently, in 1998, Hitachi launched an upgraded version of S-IPS (Super IPS), which not only inherited the original technological advantages of IPS, but also further optimized the response speed. In 1999, LG Philips joined the IPS camp as a joint venture, and after the bankruptcy of the joint venture in 2006, the IPS business was mainly taken over by LG Display and has continued to develop ever since.

Now, let's turn to OLED technology. OLED， The abbreviation for Organic Light Emitting Diode is different from TFT-LCD in that it has self luminescence and does not require backlight support. OLED technology has many advantages such as wide viewing angle, high contrast, low energy consumption, high reaction speed, full-color and simple process.



According to different driving methods, OLEDs can be divided into passive OLEDs (PMOLEDs) and active OLEDs (AMOLEDs). PMOLED and AMOLED are two different types. If OLED is compared to an upgraded version of LCD, then PMOLED is more similar to STN LCD, which has gradually withdrawn from the market. PMOLED performs poorly in displaying dynamic images and has a relatively slow response speed. Despite its power-saving features, it is limited in size. For smartphone users who pursue large screens and high-definition effects, PMOLED's 5-inch low resolution display is clearly not attractive enough to meet their needs. In addition, expanding the size of PMOLED will lead to an increase in pixel brightness and operating current, thereby shortening its lifespan.

Therefore, the vast majority of OLED screens we come into contact with today are AMOLED screens. AMOLED， Active matrix organic light-emitting diode, meaning active matrix organic light-emitting diode or active matrix organic light-emitting diode. The term 'AM' represents the pixel addressing technology behind it. This technology enables AMOLED to achieve low energy consumption and wide viewing angle display while maintaining high resolution and fast response, becoming one of the mainstream display technologies today. Not only smartphones, but also Samsung and LG's TV products use AMOLED screens, further proving their broad application prospects.

The core of AMOLED technology lies in its OLED matrix molecules, which can emit and store or integrate light into TFTs after electrical excitation. By precisely controlling the direction of current flowing to each pixel, AMOLED achieves high resolution and fast response. Each pixel is equipped with at least two TFTs to ensure stable control of continuous current. TFT backplane technology is crucial for AMOLED, and currently this technology has adopted two solutions: polycrystalline silicon and amorphous silicon.

The significant advantages of AMOLED include its self luminescence, wide viewing angle display, high contrast, and fast response time. In addition, compared to PMOLED, AMOLED also has a higher refresh rate, significantly reducing energy consumption. However, under direct sunlight, the reading effect of AMOLED may be affected to some extent. To improve this issue, Samsung has launched Super AMOLED technology, which enhances the display effect under strong light by reducing the screen spacing.

With the advancement of technology, Super AMOLED technology, as an upgraded version of MOLED, has the core improvement of reducing the screen spacing, which significantly improves the display effect in strong light environments. This technological innovation has significantly improved the outdoor reading experience of Super AMOLED, bringing consumers a more comfortable visual enjoyment.

Price reference for mobile phone screensUpon entering a mobile phone repair shop, you will discover that the prices for screen replacements vary widely across different brands and models. Taking Apple phones as an example, here is a simple price reference for you:iPhone 13 seriesPrice of the outer screen: approximately 500~700 yuanPrice of the inner screen: approximately between 600 and 1300 yuanScreen assembly price: approximately around 1600~1900 yuaniPhone 14 seriesPrice of outer screen: approximately 700~900 yuanPrice of the inner screen: approximately 900~1700 yuanScreen assembly price: approximately around 1700~2300 yuaniPhone 15 seriesPrice of the outer screen: approximately around 1100 yuanPrice of the inner screen: approximately between 1200 and 2200 yuanScreen assembly price: approximately around 1700~2400 yuaniPhone 16 seriesScreen assembly price: approximately around 1700~2400 yuan
Why is it so expensive to replace a phone screen?The reason why mobile phone screens are expensive lies primarily in their complex composition. A complete mobile phone screen typically consists of an outer screen (touch screen), an inner screen (display screen), and an adhesive layer in between.When a mobile phone screen is shattered, it could be due to a cracked outer screen or simultaneous damage to both the outer and inner screens. Therefore, during the repair process, it is often necessary to replace both parts simultaneously. This not only increases the complexity of the repair but also raises the repair cost.Moreover, with the continuous development of mobile phone technology, the composition and structure of mobile phone screens are also constantly being updated and upgraded. The emergence of these new technologies may also lead to an increase in the cost of repairing mobile phone screens.In addition, apart from the cost of the phone screen itself, the technical cost of replacing a phone screen is also significant. This is because the connection between the screen and the motherboard has become increasingly precise, and even the slightest mistake can damage other components.Therefore, the cost of repairing a screen is high due to the nature of the phone screen itself and the technical difficulty of the repair process.
How to find a repair service for screen replacement of a mobile phone?There are generally three ways to repair or replace a broken mobile phone screen:Firstly, one may choose official maintenance, which is transparent in price and guaranteed in quality, but often comes at a high cost;Secondly, through third-party repair platforms, the prices are relatively cheaper.Lastly, if you have all the necessary tools, you can also try purchasing a screen and replacing it yourself.It is important to note that one must possess relevant replacement experience and knowledge reserves, otherwise it is easy to end up making a mess of the replacement process.Of course, if you want an experienced technician to replace the screen of your phone, you can always turn to Geek Repair.Whether it's a broken outer screen, damaged inner screen, or a need to replace the entire screen assembly, we offer on-site repair services. You can easily solve your phone screen issues without leaving your home.