OLED Display Panel Photosensitive Sensor Brightness Compensation
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Solution Overview
Problem
Organic light-emitting diode (OLED) display panels using oxide thin film transistors face instability issues, leading to inconsistent brightness and abnormal image display due to drifting threshold voltage and mobility, which external circuit compensation cannot fully address, especially with aging light-emitting materials.
Innovation Solution
Incorporating a plurality of sub-pixel units with photosensitive detection units, each comprising at least two photosensitive sensors of different photosensitivities, with varying light receiving areas and shielding layers, to accurately determine the actual brightness and adjust the driving voltage accordingly, ensuring consistent image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external circuit compensation is used to compensate TFT characteristics, then the influence of Vth and MOB can be reduced, but it cannot solve the problems due to aging of light-emitting material
Solution Approach 1:
The patent segments the compensation function into two independent parts: (1) TFT compensation through external circuits, and (2) light-emitting material aging compensation through photosensitive sensors. This segmentation allows each subsystem to address its specific compensation needs without interference, resolving the limitation where a single compensation method cannot cover both issues.
Solution Approach 2:
The patent introduces photosensitive sensors as an intermediary component between the light-emitting material and the control system. These sensors detect the actual brightness output and provide feedback signals that enable dynamic compensation for light-emitting material aging, thereby extending compensation coverage beyond what external circuit compensation alone can achieve.
2Measurement precision
If photosensitive sensors are added to detect actual brightness, then brightness consistency can be improved, but device complexity increases
Solution Approach 1:
The photosensitive sensors serve multiple functions: they detect brightness, provide feedback signals, and enable automatic compensation. By making the sensors multi-functional, the patent reduces the need for additional separate components, thereby mitigating the increase in device complexity while maintaining high measurement precision.
Solution Approach 2:
The system implements self-service through automatic feedback compensation. The photosensitive sensors continuously monitor brightness and automatically adjust compensation parameters without requiring external intervention, reducing the complexity of manual calibration and control systems while maintaining high detection accuracy.
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
This solution enables precise adjustment of driving voltage based on actual brightness, maintaining consistent image display and compensating for the instability and aging effects, thereby improving the reliability of OLED display panels.
Implementation Method 1
acquiring electric signals outputted by the at least two photosensitive sensors in a photosensitive detection unit corresponding to a sub-pixel unit
Data Source
AI summary
A display panel which may include a plurality of sub-pixel units (1) and a plurality of photosensitive detection units (2) corresponding to the plurality of sub-pixel units (1) respectively. Each of the plurality of the photosensitive detection units (2) may include at least two photosensitive sensors (21).