China Shenzhen Kadi Display Technology Co., Ltd Company News

The phenomenon of image burn can have various negative impacts on digital signage, HMIs, medical displays, and other industrial-grade screens where static content is unavoidable. This article aims to provide electronic engineers with insights into considering image burn when designing LCD displays.   1. Choose the right display technology: Select technology that is less likely to age quickly. For instance, while OLEDs offer vibrant colors and deep blacks, they are more susceptible to screen burn-in than LCDs. If static content is a crucial part of the device's use case, then LCD may be a better choice.   2. Implement pixel shifting: Incorporate pixel shifting technology in the firmware. This will periodically move the displayed content slightly, reducing the chance of any particular pixel being stationary for an extended period of time.   3. Automatic dimming: Incorporate sensors to detect ambient light and adjust screen brightness accordingly. This not only saves energy but also reduces stress on the display, minimizing the risk of screen burn.   4. Screen saver and sleep mode: Always integrate a screen saver or automatic sleep function that activates after a certain period of inactivity. This prevents static images from being displayed continuously.   5. Dynamic content rotation: For devices that display static content, such as clocks or gauges, consider periodically rotating the content's position or changing its appearance.   6. Educate end users: Include guidance in the user manual on the risk of image burns and how to prevent them. This could be as simple as advising against keeping static images on the screen for extended periods of time.   7. Strict testing: Before finalizing your product, test your display under a variety of conditions to understand its susceptibility to burn-in. This includes testing at maximum brightness and with static content for extended periods of time.   8. Firmware update: Ensure that the device firmware can be updated. This allows you to introduce new precautions or improvements based on actual feedback after the product is released.   9. Consider refresh rate: A higher refresh rate reduces the chance of screen burn because it means pixels are refreshed more frequently. However, please balance this with power consumption concerns.   10. Quality components: Invest in high-quality display components. Better quality materials and manufacturing processes can inherently reduce the risk of image burn.   11. Feedback mechanism: Implement a system where users can report display issues, including screen burn-in issues. This real-world feedback is invaluable for improving future designs.   12. Stay updated: The electronic world is constantly evolving. Stay up to date on the latest research, technology, and solutions related to display aging. Join forums, attend seminars, and read journals to stay informed.   By considering these measures, electronics engineers can significantly reduce the risk of image burn in LCD display designs, ensuring longevity and user satisfaction.

Certain industrial display applications are more susceptible to image burnout due to the prolonged display of static content. These scenarios necessitate additional attention and precautions in the following use cases:   1. Industrial equipment: Monitors and screens are commonly used in industrial environments for control panels, machine interfaces, and monitoring systems. These displays are crucial for the safe and efficient operation of equipment. Over time, aging not only impairs readability but also poses security risks. Misinterpreting critical values on a burn-in screen could lead to mechanical failure or accidents.   2. Military applications: Displays are utilized in various military equipment, from communications devices to advanced weapons systems. The clarity and accuracy of these screens are essential for mission success and personnel safety. Image burning can compromise the integrity of mission-critical data, potentially leading to operational malfunctions or unintended consequences.   3. Marine industry: Navigation and ship control systems heavily rely on displays to provide sailors and captains with vital data such as GPS coordinates, sonar readings, and weather maps. Image burnout in this case could result in navigation errors, potentially leading to maritime accidents or the ship going off course. Given the challenging conditions at sea, ensuring the longevity and clarity of these displays is paramount.   4. Digital menu boards and kiosks: In fast food restaurants, cafes, and retail stores, menu layouts, pricing, and branding often remain unchanged for extended periods, with limited flexibility in use.   5. Medical monitors: Devices like heart rate monitors, MRI machines, and ventilators depend on screens to provide accurate readings and controls. A burnt display can lead to misunderstandings with dire consequences for patient care, potentially resulting in incorrect treatment or dosage.   6. Aircraft HMI: Maps, flight plans, and aircraft data remain static for prolonged periods during a flight, with the monitor operating in a fixed orientation.   7. ATM and point of sale systems: UI elements such as account balances and transaction information are continuously displayed with limited content flexibility due to functional requirements.   8. Control room workstations: Critical static data must remain on the screen at all times for monitoring purposes, with monitors typically running 24/7.   9. Digital signage and billboards: Fixed layouts and ad content run continuously for weeks or months, with the monitor operating unattended.   For such use cases, it is crucial to implement aging mitigation strategies and perform more frequent burn-in testing on higher-risk deployments. Additionally, having a backup device ready in case of image retention is essential.   Ensuring the longevity and clarity of displays in every field is not only a matter of convenience but also safety, efficiency, and, in some cases, life and death. Taking appropriate precautions against image burnout is critical.

To prevent image burn-in on industrial displays, there are several strategies you can use to minimize the risk. Here are some best practices: 1. Use features that reduce screen burn: Many modern monitors include specialized anti-burn-in features such as pixel shifting, screen sampling, logo dimming, and screen timeout. Enable these modes for maximum protection. 2. Use a screen saver and save battery: Configure display settings to activate the screen saver and put the panel to sleep after a few minutes of inactivity. This prevents the continuous display of static content. 3. Optimize UI/UX design: Avoid fixed UI elements such as persistent status bars, use rotation animations for icons and buttons, and keep on-screen logos/text/graphics small and reposition them frequently. 4. Update static content frequently: For unavoidable static content, change the location of the information regularly, and alter layout, colors, backgrounds, and themes regularly. 5. Limit peak brightness: Don't turn the brightness to maximum unless absolutely necessary. Use the brightness control to maintain optimal image quality at lower brightness levels. 6. Improve usage flexibility: Encourage different display uses through changing images and positions frequently in different directions with mixed content types. 7. Apply aging warranty: Look for industrial monitors with burn-in warranties that guarantee compensation for permanent image retention issues. Have a clear damage claims and replacement policy. 8. Perform periodic burn-in tests: Continually check for image retention and take mitigation measures if problems arise to prevent minor ghosting from turning into permanent damage.

Image burn has multiple detrimental effects on digital signage, HMIs, medical displays, and other industrial-grade screens where static content cannot be avoided. Visible artifacts and afterimages are the most obvious effect and include ghosting, logos, and status bars burned into the display. This can make the display look unprofessional and unsuitable for public use. Medical monitors and airline HMI systems may display patient vital signs, charts, and maps. Kiosks and menu boards preserve menu layout, pricing, and labeling. ATM displays show account information and selection fields. This type of artifact is unacceptable for a commercial system expected to deliver high-quality images 24/7, and customers will view such monitors as defective and inferior. Burnt areas will have permanently reduced light and color output, resulting in lower brightness and contrast compared to unaffected areas. This leads to unevenness in the image, affecting solid colors, gradients, and overall image quality. A monitor with burn marks may not render all graphics and information correctly, leading to operational safety issues. Flying HMIs can obscure critical maps and data, medical monitors can obscure subtle diagnostic details, and ATM machines may hide account numbers and text prompts. This can lead to dangerous operating situations where the user cannot fully rely on the display visuals, posing significant safety concerns for many mission-critical industrial display applications. Image burn permanently degrades the light-emitting elements in the screen through accelerated, uneven aging, shortening the expected functional life of the affected monitors. Industrial-grade monitors are expected to last 5-10 years in 24/7 operation, but image burn-in can prematurely damage the screen within a few months, resulting in costly replacements. A monitor with a noticeable ghost image will look visibly defective and reflect poor quality standards from the supplier in the eyes of the customer. Poor image quality due to uneven brightness and distortion makes the use of digital signage, kiosks, HMIs, and medical displays frustrating, leading to a loss of trust, reputational damage, and overall dissatisfaction.

Image burn, also known as image retention or ghosting, is a phenomenon in which static images displayed for long periods leave permanent discoloration on the screen. This is a major issue with industrial-grade displays such as HMIs, POS systems, digital signage, medical displays, etc., where static content may be displayed for long periods. What causes image burn-in on the monitor? Image burn occurs due to fundamental limitations of display technologies such as LCD, LED, OLED, plasma, CRT, etc. Displaying static content for a long time will cause the light-emitting elements in the screen to age unevenly. 1. Static display elements: Displaying static elements (such as channel logos, screen graphics, or even the taskbar on your computer screen) for an extended period may cause screen burn. When displayed continuously, these elements may unevenly wear away the organic compounds or phosphors in the screen. 2. High brightness and contrast settings: Operating the screen at maximum brightness and contrast for extended periods can accelerate the aging process, especially in OLED displays where individual pixels emit light. 3. Extended display time: Turning on the screen for a long time without changing the display content may cause the image to burn. This is especially true for screens that display static images or paused videos for hours on end. How does image burn-in occur on OLED displays? The image is burned on the OLED display, where each pixel has its organic light-emitting diode that emits light to form the image. When static UI elements or logos are continuously displayed in the same area, these specific OLEDs age faster than the rest of the display. This causes noticeable discoloration, which appears as lighter or darker patches. Over time, differential burn-in becomes permanent and ghosting is etched into the screen. This uneven wear of OLED is the primary mechanism of aging in OLED displays. Causes of LCD/LED display screen burn-in: LCD panels use a backlight and liquid crystal cells to control the transmission of light through each pixel. Applying a voltage to each liquid crystal twists and unravels the liquid crystal, thereby changing the amount of backlight passing through. The LCD may get stuck in the twist/untwist orientation when displaying static content continuously. This causes uneven backlight transmission and creates a burn-in effect on LCD/LED screens. Additionally, the backlight itself ages unevenly in areas that are continuously illuminated, exacerbating the screen burn effect.

The laminating materials industry utilizes adhesive materials that are classified into three primary categories. These are semi-solid OCA optical adhesive, liquid LOCA optical adhesive, and semi-solid SCA optical adhesive. LOCA, also known as liquid optical adhesive, is an ultraviolet light-cured adhesive that is designed specifically for touch screens. It possesses the following characteristics: colorless and transparent, with a light transmittance of over 98%, excellent bonding strength, low curing shrinkage, and resistance to yellowing. LOCA has a distinct advantage over traditional OCA tapes in specific applications, overcoming the limitations encountered by OCA tapes. OCA is a specialized double-sided tape that is optically transparent and free of base material. It is an essential raw material used in touch screen lamination. OCA is colorless and transparent, with a light transmittance of over 90%, excellent bonding strength, and can be cured at room or medium temperature conditions with minimal curing shrinkage. It is made of optical acrylic adhesive without a base material, and a layer of release film is attached to the upper and lower bottom layers. In summary, OCA is a specialized, substrate-free, optically transparent, double-sided tape. SCA optical glue is a new type of OCA optical glue. It is a solid UV-type optical glue that is specially designed for the new generation of touch screen bonding. It is often used between the cover plate (Lens) and the functional piece (Sensor) fitting. The surface is weakly sticky, easy to operate during fitting, quick to adjust, high in alignment and fitting accuracy, and has a high rework rate. It can flow under certain hot pressing conditions and eliminate the possibility of bubbles, and it is adaptable to fitting a wide range of sizes, with medium and large sizes being more advantageous.

TN Panel: TN panels are soft screens and are commonly used in entry-level and mid-to-low-end LCD monitors. They have a small number of output gray levels, fast deflection speed of liquid crystal molecules, and easy-to-improve response time. TN LCD screens are suitable for gamers because they have a fast response speed, low radiation level, and do not cause eye fatigue. However, their color is pale, and the viewing angle is small. If viewed off-center, there will be obvious color cast and brightness differences. Therefore, TN screens are not suitable for working and watching movies except for long-time gamers. VA Panel: Most of the curved screens on the market are VA panel monitors, and they are mostly used in mid-to-high-end LCDs. They have wide viewing angles, purer black performance, high contrast, and accurate color reproduction. However, they have relatively high power consumption, slower response time, average panel uniformity, and a slightly worse viewing angle than IPS. VA screens have a relatively high contrast, which makes them more pure when displaying a black screen. Still, they have a slower response speed, so screen tearing is prone to occur, and they have higher power consumption than IPS screens. IPS Panel: IPS panels are hard screens and are the most common and mainstream IPS among display panels. They have a fast response, large viewing angle, true colors, excellent picture, no watermarks on touch, environmental protection and energy saving, and accurate colors. However, they have light leakage and not enough black purity. The larger the screen, the larger the area of light leakage at the edges. IPS screens are recommended because they perform much better than TN in terms of image quality and have a good price/performance ratio. Panel Summary: The mainstream panels include TN, VA, and IPS. IPS has accurate colors and a high degree of restoration, while VA panel pictures are softer and have lighter colors than IPS. TN screens have poor color performance, but their dynamic performance is stronger than IPS and VA, so there are many high-refresh screens on the market. VA has the best contrast performance, followed by IPS, and finally TN has the worst contrast performance. IPS has the highest color accuracy, while VA panel pictures are relatively softer, and TN panels have slightly worse game picture color performance. For professional e-sports players, TN screens with fast response times are still the first choice. For designers who pursue high-quality color presentation, professional film and television users, and office workers/ordinary gamers who combine various needs, IPS screens or VA screens are better choices. Comparison of Three Screens at the Same Price: - Color, color accuracy: IPS > VA > TN - Response time: TN > IPS > VA - Viewing angle: IPS > VA > TN - Contrast: VA > IPS > TN

Causes of Mura: 1. LCD screen: Mura is caused by a mismatch between the motherboard drive voltage and the LCD drive voltage design, or the liquid crystal in the LCD is subject to ion accumulation, resulting in electric field charge polarization. This polarization is usually caused by the use of lower-quality liquid crystal materials. 2. OLED screen: Mura is related to the lifespan and luminous efficiency of RGB luminescent materials, especially blue luminescent materials, which have always been a challenge in OLED research and development. OLED screens are highly sensitive to water vapor and oxygen, which may cause screen degradation or failure once exposed. OLED standards: A universal standard for OLED screens is T95, which represents the time it takes for brightness to decay to 95% at maximum manual brightness. For example, Apple requires that its OLED screens be free from mura or aging problems within 500 hours. To prevent mura issue, we recommend taking the following steps: 1. Avoid displaying static images for long periods: Please avoid displaying the same image on the screen for a long time, particularly high-contrast images. 2. Use dynamic screensavers: Regularly using dynamic screensavers can help reduce mura issues. 3. Adjust the screen brightness: Do not use maximum brightness for extended periods. Appropriately reducing screen brightness can extend screen life. 4. Ambient temperature: Avoid using the screen in extremely hot or cold environments, as temperature fluctuations may exacerbate mura problems. We are confident that these suggestions can help optimize the use of your screen and reduce the occurrence of mura problems. If you have any further questions or need additional help, please do not hesitate to contact us. We are here to assist you.

The basic structure of the touch screen is divided into three layers: protective glass, touch layer, and display panel. When you look at your mobile phone screen, have you ever thought about how the three-layer structure of the screen fits together? There are two types of touch screen lamination technologies: frame lamination and full lamination. Frame lamination(Air bonding) Double-sided tape is used to fix the four sides between the touch screen and the display. As shown in the figure below, the advantages of Air bonding are low technical difficulty and low cost. The disadvantage is that there is an air layer between the display and the touch screen bonded using double-sided tape, which will greatly reduce the display effect after light is refracted. Full lamination(Optical bonding) The touch screen and display are seamlessly bonded using water glue（LOCA） or optical glue(OCA) As shown in the figure below, there is no air between the screens with full lamination technology, which can greatly reduce light reflection, reduce light loss, and thereby increase brightness. However, the investment cost of using glue for bonding is higher and rework is more difficult. Comparison of two laminating processes Both lamination processes have their own advantages and disadvantages, but from a comprehensive evaluation from the perspectives of cost, display effect, maintenance, etc., the full lamination process is the main development trend of the current lamination process. On the one hand, the full lamination process better bonds the gaps between the layers, reducing the probability of air and dust entering; on the other hand, the full lamination technology removes the air between the screens, which can greatly reduce the reflection and loss of light, making the picture more beautiful. More transparent; in addition, the full lamination process is thinner and has better restoration when displaying the all-black effect.  

Now most customer will choose ILITEK touch controller for PCAP Touch screen project.Sometime they are confuse how to choose the best one.Today we shall  show you some tips. For Small size: up to 10.1” ILI2117A/2118A: ILI2117A(41ch) can be used in up to 7” ILI2118A(49ch) can be used in up to 10.1” Can support 2mm thickness cover glass, 2mm thickness Gloves touch Can support CS 10V, and waterproof touch   ILI2130/2131: ILI2130(47ch) can be used in up to 10.1” ILI2131(58ch) can be used up to 12.1” Can support VTx=10V, I2C interface. -40 to 85 degree Can support CS 10V, 8mm thickness Cover glass , waterproof touch   ILI2712 TQFP(72ch) Can support up to 12.3” Can support AECQ-100 ,-40 to 105 degree Can support CS 10V, 10mm Thickness Cover glass ,Waterproof touch   ILI2520/ILI2521 ILI2520(65ch) can be used in up to 15.6” ILI2521(110ch) can be used in up to 23.8” Can support VTx=15V, USB I2C interface, -40 to 85 degree Can support CS 10V, 10mm thickness Cover glass, Waterproof touch   ILI2520A/2521A Can support up to 12.3”,I2C USB interface, -40 to 85 degree Can Support CS 10V,10mm thickness cover glass, waterproof touch Can support active pen(Microsoft& AES)   ILI2510/ILI2511 ILI2511(65ch) up to 15.6” ILI2510(99ch) up to 21.5” Can support CS 10V,10mm thickness Cover glass,waterproof touch   ILI2322/2323 ILI2322(140ch) can be used in up to 32” ILI2323(170ch) can be used in up to 43” Can support VTx=15V, USB I2C interface, -40 to 85 degree Can support CS 10V, 10mm thickness Cover glass, Waterproof touch ILI2322A/2323A Can support USB I2C interface, -40 to 85 degree Can support CS 10V, 10mm thickness Cover glass, Waterproof touch Can support active pen(Microsoft& AES)   ILI2312/2315/2325 ILI2312(126ch) up to 27” ILI2315(154ch) up to 32” ILI2325,cascaded up to 85” Can support CS 10V, 8mm thickness Cover glass, Waterproof touch   ILI2316/2326 ILI2316(220ch) 1-chip up to 65” ILI2326, cascaded up to 110” Can support VTx=30V, USB I2C interface, -40 to 85 degree Can support CS 10V, 10mm thickness Cover glass, Waterproof touch   ILI2316/2326A Can support USB I2C interface, -40 to 85 degree Can support active pen(Microsoft& AES)   Now are you clearly that how to choose best ILITEK touch controller for your project,right?  Please contact with us directly if you have related project we may help. We will give you the professional solution.