OLED Pixel Circuit Driving Method for Lateral Leakage Control
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Solution Overview
Problem
In OLED display panels, the grey crush phenomenon occurs due to lateral leakage between light emitting units, leading to reduced brightness and image quality, especially when different color units have varying turn-on voltages and voltage differences, causing inefficiencies in current driving and light emission.
Innovation Solution
The driving method for the display panel involves providing specific black state and initial voltages to pixel circuits of different light emitting units, ensuring these voltages are within certain ratios of the reference voltage to minimize voltage differences and reduce lateral leakage, thereby maintaining brightness and preventing grey crush.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If different color light emitting units are driven with the same black state voltage, then the pixel circuit structure is simple, but lateral leakage occurs between units with different turn-on voltages causing grey crush
Solution Approach 1:
The patent applies local quality by providing different black state voltages to different color light emitting units based on their specific turn-on voltage characteristics. Each unit receives a customized black state voltage (first black state voltage for red, second black state voltage for green, third black state voltage for blue) that is specifically tailored to minimize lateral leakage for that particular unit, rather than using a uniform voltage for all units.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the black state voltage parameter for each light emitting unit. The method provides different voltage levels (first black state voltage, second black state voltage, third black state voltage) corresponding to different color units, and further optimizes by providing different initial voltages (first initial voltage, second initial voltage, third initial voltage) to compensate for turn-on voltage differences and prevent lateral leakage.
2Ease of operation
If the data signal line provides reference black state voltage to all pixel circuits, then the driving method is simple, but voltage differences between light emitting units cause lateral leakage and reduced brightness
Solution Approach 1:
The patent applies local quality by providing different black state voltages to different color light emitting units based on their specific turn-on voltage characteristics. Each unit receives a customized black state voltage (first black state voltage for red, second black state voltage for green, third black state voltage for blue) that is specifically tailored to minimize lateral leakage for that particular unit, rather than using a uniform voltage for all units.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the black state voltage parameter for each light emitting unit. The method provides different voltage levels (first black state voltage, second black state voltage, third black state voltage) corresponding to different color units, and further optimizes by providing different initial voltages (first initial voltage, second initial voltage, third initial voltage) to compensate for turn-on voltage differences and prevent lateral leakage.
3Device complexity
If same initial voltage is provided to all light emitting units, then the control scheme is simple, but voltage differences in turn-on voltage cause inefficient current driving
Solution Approach 1:
The patent applies local quality by providing different black state voltages to different color light emitting units based on their specific turn-on voltage characteristics. Each unit receives a customized black state voltage (first black state voltage for red, second black state voltage for green, third black state voltage for blue) that is specifically tailored to minimize lateral leakage for that particular unit, rather than using a uniform voltage for all units.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the black state voltage parameter for each light emitting unit. The method provides different voltage levels (first black state voltage, second black state voltage, third black state voltage) corresponding to different color units, and further optimizes by providing different initial voltages (first initial voltage, second initial voltage, third initial voltage) to compensate for turn-on voltage differences and prevent lateral leakage.
Data Source
AI summary
A display panel includes multiple pixel units that are arranged regularly. A pixel circuit is connected with a scanning signal line and a data signal line. The pixel circuit receives a data voltage transmitted by the data signal line and outputs a corresponding current to a light emitting device under a control of the scanning signal line. When a first light emitting unit is in a black state, the data signal line provides a reference black state voltage to a pixel circuit of the first light emitting unit. The driving method of the display panel includes: providing, by the data signal line, a first black state voltage to a pixel circuit of a second light emitting unit when the first light emitting unit emits light and the second light emitting unit is in the black state. The first black state voltage is less than the reference black state voltage.