OLED Display Photodiode Zones for Brightness and Color Compensation
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Solution Overview
Problem
OLED displays face challenges in maintaining consistent brightness and color due to aging and varying ambient light 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 zones to compensate for these variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If OLED displays operate in varying ambient light conditions, then the display can be used in different environments, but the perceived brightness and color uniformity deteriorates
Solution Approach 1:
The display is divided into multiple zones with individual photodetectors and OLED groups, allowing independent measurement and compensation of each zone's ambient light conditions and aging characteristics, thereby maintaining overall uniformity despite environmental variations
Solution Approach 2:
Photodetectors continuously measure ambient light and OLED emission in each zone, providing feedback to the controller which adjusts driving strengths to compensate for environmental changes and aging, maintaining display uniformity across varying conditions
2Productivity
If OLED displays are used for extended periods, then the display can provide continuous service, but the brightness and color stability deteriorates due to aging
Solution Approach 1:
The system performs preliminary characterization of each OLED's emission properties and aging characteristics during manufacturing and initial operation, storing this data for use in real-time compensation to maintain stability during extended operation
Solution Approach 2:
Photodetectors continuously monitor OLED emission properties and compare them against target values, providing feedback that drives real-time adjustments to compensate for aging effects and maintain brightness and color stability during continuous operation
3Measurement precision
If photodetectors are integrated within the display area, then proximity sensing accuracy is improved, but the display area is reduced
Solution Approach 1:
The photodetectors serve dual functions: measuring ambient light for display compensation and detecting proximity of objects, eliminating the need for separate proximity sensor components and allowing full utilization of the display area
Solution Approach 2:
The proximity sensing function is merged with the ambient light sensing function by using the same photodetector array, combining multiple measurement capabilities into a single integrated system that maintains display area while improving measurement precision
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 in varying environments and extending the useful life of the OLEDs.
Implementation Method 1
Photodetectors may be disposed in the display with individual OLEDs or zones of OLEDs to adjust their emitted light. In an embodiment, 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.