In the current smartphone market, OLED screens have gradually covered mid to high end models, and with their advantages of high contrast and excellent color performance, they bring users an excellent visual experience. As smartphones become the most frequently used electronic devices in people's daily lives, how to further improve screen display quality, achieve more accurate color reproduction, and optimize brightness and color temperature control has become the focus of industry attention.

Recently, AMS Osram held a roundtable forum in Shenzhen with the theme of "True Color Vision: Comfortable Brightness and Intelligent Display of Natural Colors". Industry experts gathered together to explore how the new generation of OLED screen spectral color sensing technology can lead the transformation of display experience.

The Technological Evolution of Environmental Light Perception

Traditional ambient light sensors are usually located on the back of mobile phones or at the edge of the screen, which can easily cause measurement errors due to finger occlusion or interference from the screen's own light emission. Even if we upgrade from RGB sensors to XYZ sensors that are closer to human vision, it is still difficult to accurately analyze spectral information in complex lighting environments, resulting in insufficient screen brightness under strong outdoor light and yellowish color temperature under warm indoor light.

AMS Osram has achieved a breakthrough through the new generation of five channel spectral sensing technology. This technology sets up five specific band sensors in the visible light range, which can more accurately capture the color temperature and brightness information of ambient light, output a "spectral vector" instead of a simple brightness value, thereby achieving high-precision reconstruction of ambient light. Dalibor Stojkovic, R&D Director of the iOS Business Unit at AMS Osram, introduced the core breakthrough of the new generation OLED under screen spectral color sensing technology: "Compared with traditional RGB sensors, our five channel spectral response technology can more accurately capture the characteristics of ambient light and output 'spectral vectors' instead of simple brightness values. ”

In response to the challenges faced by under screen sensors, the AMS Osram OLED under screen spectral sensor has achieved three core technological breakthroughs:

1. Hybrid silver filter to enhance infrared suppression capability

The new generation of sensors adds a silver coating on the interference filter, which increases the infrared light suppression ability by 10 to 1000 times, making the measurement results closer to the actual perception of the human eye.

2. Beam shaping technology to expand the effective field of view angle

To address the issues of narrow light transmission holes and limited field of view in COE display screens, a special optical diffusion design is used to optimize the angle response curve, enabling the sensor to accurately perceive ambient light at different incident angles.

3. Dynamic scattering compensation and high-speed sampling

The sensor can complete ambient light sampling within 50 microseconds, combining multi segment sampling technology and dynamic algorithms to effectively distinguish between ambient light and screen backscattered light, ensuring measurement accuracy is not disturbed.

Industrial collaboration: Sensors are just one part of the system puzzle

In the current development of display technology, the competition for display screens is shifting from parameter stacking to technological innovation. In the face of multiple technological challenges arising from this, focusing solely on the display itself is no longer sufficient. It is necessary to establish a global perspective and coordinate software and hardware collaboration from the perspective of the overall display system.

Dalibor stated that high-quality display effects are never achievable with a single technology, but rather the result of multiple collaborative processes. This requires deep cooperation among panel manufacturers, mobile phone brands, and OEM manufacturers. For example, in the calibration process of spectral data, optical path transmission accuracy, and panel integration, any deviation in data may cause color distortion. Only through industry chain collaboration can such color difference problems be systematically solved.

Calibration is not only the foundation of color reproduction, but also the key to achieving visual authenticity and eye comfort. Different display devices have their own characteristics and parameters, and precise adjustments must be made to address these differences. With the help of new technologies such as ambient light characterization, we are gradually achieving more realistic color reproduction, which is also an important direction for the future development of display technology.

In the context of the continuous upgrading of OLED technology, we are not only facing the challenge of sensors themselves, but also the optimization issue of the entire display system. ”Dalibor said that only through industry collaboration that emphasizes both depth and breadth can we fundamentally promote the overall leap of display effects and move towards a more realistic, comfortable, and consistent visual future.

It is not difficult to find through this forum that a tiny under screen color sensor is becoming one of the key factors determining the final display quality of the screen. Although sensors are only a part of the display system, they clearly indicate that only through deep collaboration between hardware and software can the best visual performance be released. However, achieving this vision requires deep collaboration between the upstream and downstream of the industry chain. From sensor manufacturers to panel manufacturers, from mobile phone brands to algorithm developers, all parties need to work together to build a more intelligent display ecosystem. It can be foreseen that in the near future, terminal products equipped with a new generation of under screen spectral color sensors will be launched one after another. And high-quality display experience is also expected to extend from mobile phones to computer monitors, televisions, and even professional photography, bringing users a wider range of visual improvements.

About The Author

This is reported by Top Components, a leading supplier of electronic components in the semiconductor industry

They are committed to providing customers around the world with the most necessary, outdated, licensed, and hard-to-find parts.

Media Relations

Name: John Chen

Email: salesdept@topcomponents.ru

This is reported by Top Components, a leading supplier of electronic components in the semiconductor industry. They are committed to p with the most necessary, outdated, licensed, and hard-to-find parts.

Media Relations Name: John Chen

Email: salesdept@topcomponents.ru