OLED Panel Gamma Adjustment for Sub-Pixel Leakage Control
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Solution Overview
Problem
OLED display panels suffer from poor uniformity due to lateral leakage currents caused by voltage differences between adjacent sub-pixels, leading to reduced brightness and abnormal display during monochrome color presentation.
Innovation Solution
A display panel with a driver chip that adjusts the gamma voltage of non-emitting sub-pixels based on the emission status of surrounding sub-pixels, generating a target gamma voltage greater than the original to reduce voltage differences and minimize leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the voltage difference between adjacent sub-pixels is maintained for light-emitting operation, then the light-emitting sub-pixel achieves sufficient brightness, but the non-light-emitting sub-pixel experiences increased lateral leakage current causing brightness reduction and display non-uniformity
Solution Approach 1:
The patent applies local quality by differentiating the voltage control strategy between light-emitting and non-light-emitting sub-pixels. Specifically, when a sub-pixel is determined to be non-light-emitting (monochrome display mode), its voltage is adjusted to a second voltage level that is closer to the light-emitting sub-pixel voltage, thereby reducing lateral leakage current locally at the non-emitting pixel while maintaining sufficient brightness at emitting pixels
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the voltage of non-light-emitting sub-pixels based on display mode. In monochrome mode, the voltage of non-emitting sub-pixels is changed from the first voltage level (used in full-color mode) to a second voltage level that reduces the voltage difference with adjacent emitting pixels, thereby controlling leakage current and improving display uniformity
2Reliability
If the voltage difference between adjacent sub-pixels is reduced to minimize leakage current, then display uniformity is improved, but the brightness of light-emitting sub-pixels may be reduced
Solution Approach 1:
The patent applies local quality by implementing differential voltage control: light-emitting sub-pixels maintain their original voltage levels to ensure sufficient brightness, while only non-light-emitting sub-pixels have their voltages adjusted to reduce leakage current. This localized approach ensures that brightness requirements are met for emitting pixels while uniformity is improved overall
3Reliability
If the gamma voltage of non-emitting sub-pixels is adjusted to reduce voltage difference, then lateral leakage current is reduced, but the complexity of the driver chip increases
Solution Approach 1:
The patent implements feedback by having the driver chip detect the display mode (monochrome vs. full-color) and automatically adjust the voltage of non-light-emitting sub-pixels accordingly. The adjustment is triggered by detection of the emission status of surrounding sub-pixels, creating a feedback loop that dynamically optimizes voltage levels to reduce leakage current while maintaining simplicity through automated control
Data Source
AI summary
A display panel and an electronic device are disclosed. The display panel includes a panel body comprising a first sub-pixel and a second sub-pixel of different colors, and a driver chip electrically connected to the first sub-pixel and the second sub-pixel. The driver chip includes an adjustment module, configured to determine whether the first sub-pixel does not emit light and whether a plurality of second sub-pixels around the first sub-pixel emit light and to adjust an original gamma voltage of the first sub-pixel to generate a target gamma voltage when the first sub-pixel does not emit light and the plurality of second sub-pixels around the first sub-pixel emit light. The target gamma voltage is greater than the original gamma voltage.