OLED Display Luminance Compensation via Photodetector Feedback
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Solution Overview
Problem
High PPI OLED display devices face challenges in achieving uniform luminance due to space limitations, which restrict the use of more complex pixel circuits, leading to shifted threshold voltages and poor display effects.
Innovation Solution
An OLED display device with a controller and light-sensitive components that detect and compensate for luminance, allowing for precise adjustment of light emission to improve uniformity and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high PPI OLED display device uses the simplest 2T1C pixel circuit due to space limitations, then the device can be manufactured with high pixel density, but the threshold voltage shifts leading to uneven luminance and poor display effect
Solution Approach 1:
The patent introduces a feedback mechanism where light-sensitive components (photodetectors) detect the actual luminance output of each sub-pixel, and the controller adjusts the driving voltage accordingly to compensate for threshold voltage shifts. This closed-loop feedback system maintains luminance uniformity despite using simplified 2T1C circuits, resolving the contradiction between high pixel density and display quality.
Solution Approach 2:
Each sub-pixel performs self-diagnosis and self-correction by using integrated photodetectors to monitor its own luminance output and automatically adjusting its driving parameters through the controller. This self-service mechanism eliminates the need for complex external testing equipment and enables automated compensation for manufacturing variations.
2Device complexity
If the threshold voltage compensation circuit is not used to simplify the pixel circuit, then the device complexity is reduced, but the threshold voltage shifts causing uneven luminance
Solution Approach 1:
The patent replaces the traditional open-loop threshold voltage compensation circuit with a closed-loop feedback system using photodetectors and a controller. This feedback mechanism dynamically adjusts driving voltages based on actual luminance measurements, achieving luminance uniformity without requiring complex compensation circuits in each pixel.
Solution Approach 2:
The patent substitutes the electrical threshold voltage compensation mechanism with an optical measurement and electrical adjustment system. Instead of using electrical circuits to compensate for threshold shifts, the system uses light detection and subsequent voltage adjustment to achieve the same goal, simplifying the pixel circuit while maintaining display quality.
3Measurement precision
If multiple light-sensitive components are disposed on different regions of the display area, then the luminance detection precision is improved, but the device complexity increases
Solution Approach 1:
The patent divides the display area into multiple regions, each with dedicated light-sensitive components for luminance detection. This segmentation allows independent measurement and compensation for different display regions, improving overall luminance uniformity while managing complexity through modular regional control.
Solution Approach 2:
The patent implements region-specific luminance detection and compensation, where each light-sensitive component measures and compensates for luminance characteristics of its corresponding display region. This local quality approach ensures that each region is optimized independently, accounting for variations in luminance across different areas of the display.
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 improved uniformity and display effectiveness by detecting current luminance and applying compensation values, enhancing the display performance of high PPI OLED devices.
Implementation Method 1
a luminance of the light, which is emitted by the OLED display element, detected by the at least one light-sensitive component
Data Source
AI summary
An OLED display device, including a substrate, an OLED display element disposed on a display area of the substrate, at least one light-sensitive component and a controller electrically connected to at least one light-sensitive component. The controller is configured to control the OLED display element to emit light, and to perform a luminance compensation on the OLED display element according to a luminance of the light emitted by the OLED display element detected by the at least one light-sensitive component.