Display Panel Dual Gamma Reference Voltages for Abnormal Pixels
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Solution Overview
Problem
Display apparatuses suffer from dark or bright points due to abnormal pixels with inconsistent driving voltage ranges, leading to deteriorated display quality and increased power consumption.
Innovation Solution
The display apparatus incorporates a dual gamma reference voltage generator system, generating separate voltage ranges for normal and abnormal pixels, with a wider range for abnormal pixels to ensure proper luminance and reduce visibility of defects, while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single gamma reference voltage group is used for all pixels, then the device complexity is reduced, but abnormal pixels cannot achieve proper luminance and appear as visible defects
Solution Approach 1:
The gamma reference voltage group is segmented into multiple sub-groups (first gamma reference voltage group for normal pixels, second gamma reference voltage group for abnormal pixels). Each sub-group is optimized for specific pixel types, allowing abnormal pixels to achieve proper luminance without affecting normal pixel performance.
Solution Approach 2:
Different gamma reference voltage characteristics are applied to different pixel locations based on their operational status. Abnormal pixels receive a customized voltage group with adjusted reference voltages and step intervals, while normal pixels continue to use the standard voltage group.
2Reliability
If the driving voltage range for abnormal pixels is extended to cover the full luminance range, then abnormal pixels can emit light within target luminance range, but power consumption increases significantly
Solution Approach 1:
The second gamma reference voltage group uses modified parameters compared to the first group: the second reference voltage is higher than the first reference voltage, and the voltage step intervals are adjusted. This allows abnormal pixels to achieve wider luminance coverage while maintaining lower overall power consumption through optimized voltage utilization.
Solution Approach 2:
The voltage range for abnormal pixels is extended only to the extent necessary to cover the target luminance range, rather than providing excessive voltage headroom. This minimizes power consumption while ensuring adequate luminance coverage.
3Use of energy by moving object
If abnormal pixels are driven with standard voltage ranges, then power consumption is minimized, but dark or bright points become visible on the display panel
Solution Approach 1:
The pixel driver circuit acts as an intermediary that selectively routes different gamma reference voltage groups to normal and abnormal pixels based on their operational characteristics. This ensures that abnormal pixels receive the customized voltage group needed for uniform display without affecting overall power consumption.
Data Source
AI summary
A display apparatus includes a display panel including a normal pixel and an abnormal pixel having a driving voltage range different from the normal pixel, a gate driver applying a gate signal to the display panel, a gamma reference voltage generator outputting a first gamma reference voltage group and a second gamma reference voltage group, a data driver outputting a first data voltage based on the first gamma reference voltage group and a second data voltage based on the second gamma reference voltage group and a driving controller configured to control the gate driver, the gamma reference voltage generator and the data driver. The normal pixel receives the first data voltage and the abnormal pixel receives the second data voltage. A first voltage range of the first gamma reference voltage group is inconsistent with a second voltage range of the second gamma reference voltage group.