OLED Display Photodiode Layout for Brightness Aging Compensation
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Solution Overview
Problem
OLED displays face challenges in maintaining consistent brightness and color due to aging and varying ambient lighting conditions, leading to uneven display quality and inaccurate proximity sensing.
Innovation Solution
Incorporating photodetectors within the OLED display to detect ambient light and aging characteristics, allowing controllers to adjust the driving strength of individual OLEDs or groups to compensate for these variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED displays are used to provide thin and lightweight displays with good viewing angles and color, then display quality is improved, but the brightness and color may change over time due to aging
Solution Approach 1:
The patent incorporates photodetectors within the OLED display structure to proactively detect ambient light conditions and OLED aging characteristics before they significantly degrade display quality. This allows the controller to preemptively adjust driving strength to compensate for aging effects and maintain consistent brightness and color output across the display lifetime
Solution Approach 2:
The patent implements a feedback mechanism where photodetectors continuously monitor the light output of individual OLEDs or zones and ambient light conditions. The controller receives this feedback and dynamically adjusts the driving strength of OLEDs to compensate for aging and ambient light variations, maintaining uniform display appearance over time
2Illumination intensity
If the brightness of the display is increased to improve visibility in bright environments, then visibility is improved, but power consumption increases
Solution Approach 1:
The patent divides the display into multiple zones with individual photodetectors and independently controllable OLED groups. This segmentation allows different brightness levels to be applied to different zones based on local ambient light conditions, optimizing visibility while minimizing overall power consumption by only brightening areas that require it
3Ease of operation
If photodetectors are placed outside the display area to detect proximity, then proximity sensing is achieved, but positioning accuracy deteriorates
Solution Approach 1:
The patent merges the proximity sensing function with the display structure by integrating photodetectors within the display area. This combination allows the same photodetector elements used for brightness sensing to also detect proximity of objects or users to the display, improving positioning accuracy while maintaining ease of operation
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
Enhances display uniformity and longevity by maintaining desired brightness and color across the display, improving visibility and functionality in diverse environments.
Implementation Method 1
Photodetectors may be disposed in the display with individual OLEDs or zones of OLEDs to adjust their emitted light. Each photodetector may detect light incident to the display.
Data Source
AI summary
Systems, methods, and devices are provided in which photodetectors disposed throughout a display are used to control the display brightness. The photodetectors are to be used for ambient light sensing, proximity sensing, or to compensate for aging OLEDs. In some embodiments, photodiodes are fabricated with OLEDs during the TFT fabrication process. In some embodiments, the photodetectors may be disposed throughout the display in zones containing OLEDs. The photodetectors are used to control the display brightness and color for the OLEDs in areas around each photodetector based on ambient light, aging, and/or nearby objects. A controller makes driving strength adjustments to the OLEDs in each zone independent of other zones. Photodetectors disposed throughout the display may improve proximity sensing and provide additional functionality to the device.