OLED Display Panel Sub-Pixel Capacitor Configuration for Light Leakage and Brightness Control
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Solution Overview
Problem
Existing OLED display panels suffer from light leakage in green sub-pixels under black screens and difficulty in reaching preset brightness in blue sub-pixels under high brightness conditions due to differences in efficiency and turn-on voltages, leading to poor display quality.
Innovation Solution
The OLED display panel incorporates differentially set capacitors in sub-pixel circuits to control light emission, specifically setting the capacitance value of the first capacitor to maximize it for green sub-pixels to prevent light leakage and minimize it for blue sub-pixels to ensure they reach preset brightness, thereby improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the capacitance value is increased to prevent light leakage in green sub-pixels, then light leakage is reduced, but blue sub-pixels cannot reach preset brightness under high brightness conditions
Solution Approach 1:
The patent applies different capacitance values to different sub-pixel circuits based on their specific characteristics. Green sub-pixel circuits are assigned larger capacitance values to prevent light leakage, while blue sub-pixel circuits are assigned smaller capacitance values to ensure they can reach preset brightness under high brightness conditions. This local differentiation resolves the contradiction by tailoring the capacitance parameter to the specific needs of each sub-pixel type.
2Device complexity
If a uniform capacitance value is used in all sub-pixel circuits, then device complexity is reduced, but display uniformity deteriorates due to different efficiency and turn-on voltage characteristics
Solution Approach 1:
The patent implements different capacitance values for different sub-pixel circuits (red, green, blue) based on their specific efficiency and turn-on voltage characteristics. This local quality approach ensures that each sub-pixel type receives the appropriate capacitance value to achieve uniform display performance, resolving the contradiction between device complexity and display uniformity.
Data Source
AI summary
The present disclosure provides an OLED display panel, including: a first conductive channel layer including active layers of a first transistor and a second transistor; a first gate layer disposed on the first conductive channel layer and including gates of the first and second transistors, a first electrode plate of a first capacitor, and a first end of the second capacitor; a second gate layer disposed on the first gate layer and including a second end of the second capacitor; a second conductive channel layer disposed on the second gate layer and including a second electrode plate of the first capacitor; a source and drain layer disposed on the first gate layer and including sources and drains of the first and second transistors; and a light emitting device disposed on the source and drain layer. The first transistor is configured to control a current flowing through the light-emitting device.