Optical Glue Filters Reflected Light for Pixel Luminance Monitoring
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Solution Overview
Problem
Current display technologies, such as AMOLEDs, face issues with 'burn-in' phenomena and complex manufacturing processes due to the integration of TFT photodiodes for light sensing, leading to high hardware costs and difficulty in accurately determining luminous intensity of display pixels.
Innovation Solution
A device comprising a self-luminous LED display, optical glue, a photo-detecting array film, and a processing chip, where the optical glue filters reflected optical signals based on critical angles to improve detection accuracy and reduce manufacturing complexity, allowing for effective monitoring of luminous intensity and detection of 'burn-in' phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TFT photodiodes are integrated into the display for light sensing to monitor luminous intensity and detect burn-in, then the light detection function is integrated into the display, but the manufacturing process becomes more difficult and complicated, reducing yield and increasing cost
Solution Approach 1:
The patent merges the light detection function with the display structure by integrating a photodiode array film beneath the display panel. This allows the display to monitor its own luminous intensity and detect burn-in phenomena without requiring separate external sensing devices, thereby achieving functional integration while managing manufacturing complexity through standardized array film integration
2Adaptability or versatility
If TFT photodiodes are integrated into the display for light sensing, then the light detection function is integrated into the display, but the yield and manufacturing cost are seriously affected
Solution Approach 1:
The patent employs a photodiode array film that can be manufactured using conventional TFT array preparation methods with amorphous silicon semiconductor layers. This approach uses readily available, cost-effective materials and processes that are already established in the industry, thereby reducing manufacturing costs and improving yield while achieving the light detection function
3Area of stationary object
If the display panel uses large-angle light emission, then the light emission coverage is improved, but stray light increases in the active matrix backplane, making it difficult to accurately determine luminous intensity
Solution Approach 1:
The patent applies local quality by positioning the photodiode array film at a specific location beneath the display panel and using optical elements to direct light from specific display pixels to their corresponding photodiodes. This spatial localization ensures that each photodiode measures only the luminous intensity of its associated pixel, eliminating interference from stray light while maintaining the benefits of large-angle light emission for display coverage
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables accurate monitoring of display pixel luminous intensity, reduces manufacturing costs, and effectively detects 'burn-in' phenomena, improving user experience and reducing hardware costs by leveraging total reflection principles and advanced optical components.
Implementation Method 1
the optical glue is configured to filter a part of the reflected optical signal whose incident angle toward the optical glue is greater than a first critical angle
Implementation Method 2
the photo-detecting array film is configured to detect the second reflected optical signal, wherein the processing chip is configured to calculate the luminous intensity of the display pixel according to the second reflected optical signal detected by the photo-detecting array film
Data Source
AI summary
A method and device for monitoring luminous intensity of display pixel is provided. The device includes self-luminous LED display, optical glue, photo-detecting array film and processing chip. The optical glue is attached to lower surface of the self-luminous LED display. The photo-detecting array film is disposed under the optical glue. The self-luminous LED display includes display pixels. Each display pixel includes a luminescent layer. The refractive index of the optical glue is smaller than that of the cover glass. The device uses the optical glue to filter the reflected light in the effective area corresponding to each display pixel. After that, the processing chip calculates the luminous intensity of the display pixel according to the first reflected optical signal detected by the photo-detecting array film. When it is determined that the luminous intensity of the display pixel is not changed in the preset period, a feedback signal is transmitted.