Display Device Gamma Voltage Segmentation for Brightness Uniformity
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Solution Overview
Problem
Display devices with areas differing in sub-pixel density suffer from brightness non-uniformity due to inconsistent data voltage application across regions with varying pixel densities.
Innovation Solution
A display device with a gamma part generating distinct gamma voltages for areas with different sub-pixel densities, a data driver applying these voltages to corresponding areas, and a scan driver controlling emission times to ensure uniform brightness, along with a dummy gate line for stable output voltage and high-potential power modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same data voltage is applied to all display areas, then the device complexity is reduced, but brightness non-uniformity occurs in areas with different sub-pixel densities
Solution Approach 1:
The patent applies different gamma voltages to different display areas based on their sub-pixel densities. The high-density area receives a first gamma voltage while the low-density area receives a second gamma voltage, ensuring each area receives the appropriate voltage level for its pixel density to achieve uniform brightness across the display.
2Illumination intensity
If higher data voltages are applied to areas with fewer sub-pixels, then brightness uniformity is improved, but the device complexity increases due to separate gamma voltage generation
Solution Approach 1:
The display panel is divided into multiple display areas with different sub-pixel densities, and separate gamma voltage generation circuits are provided for each area. The first gamma voltage generation circuit serves the high-density area while the second gamma voltage generation circuit serves the low-density area, allowing independent voltage control for each segment.
Solution Approach 2:
The patent changes the gamma voltage parameter according to the sub-pixel density of each display area. By adjusting the gamma voltage level based on the specific characteristics of each area (high-density vs. low-density), the system optimizes brightness uniformity while managing the complexity through parameter-based differentiation.
3Illumination intensity
If different gamma voltages are applied to different areas, then brightness non-uniformity is prevented, but the data driver complexity increases
Solution Approach 1:
The data driver is segmented into multiple data drivers, with each driver responsible for a specific display area. The first data driver handles the high-density area while the second data driver handles the low-density area, reducing the complexity of each individual driver while maintaining overall system functionality.
Data Source
AI summary
Discussed is a display device having a display panel including a first display area in which sub-pixels are arranged and a second display area in which the sub-pixels are not arranged in at least a portion, a gate driver that supplies at least one gate signal to the first display area and the second display area, and at least one dummy gate line disposed over the second display area, to which no sub-pixels are connected.