Pixel Circuit Common Electrode Segmentation for Color Shift
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Solution Overview
Problem
Conventional display panels experience significant color shift and yellowish tint at large viewing angles due to poorly designed pixels and manufacturing issues, where brightness of blue sub-pixel regions is delayed, leading to reduced display quality.
Innovation Solution
A pixel-related circuit design featuring multiple pixel groups with each pixel cell connected to data and scan lines, including first and second switches, a voltage-dividing switch, and a common electrode line with two independent common electrode lines, allowing for independent or simultaneous driving of pixel cells to adjust brightness and color, thereby mitigating color shift and yellow display issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common electrode line is used for all pixel cells, then the circuit structure is simple, but color shift and yellowish display occur at large viewing angles
Solution Approach 1:
The single common electrode line is segmented into multiple common electrode lines (first common electrode line and second common electrode line). Each pixel cell's voltage-dividing switch can be selectively connected to different common electrode lines, enabling independent brightness adjustment for different color sub-pixels and mitigating color shift at large viewing angles.
2Ease of manufacture
If all voltage-dividing switches are connected to the same common electrode line, then the manufacturing process is simple, but independent brightness adjustment of different color pixels is not possible
Solution Approach 1:
The common electrode line is divided into multiple independent lines, allowing different voltage-dividing switches to be connected to different lines. This enables independent control of brightness for different color sub-pixels (R, G, B) while maintaining a relatively simple manufacturing process through selective connection during fabrication.
Solution Approach 2:
Different pixel cells or sub-pixels are assigned to different common electrode lines based on their color and brightness requirements. For example, blue sub-pixels may be connected to one common electrode line while red and green sub-pixels are connected to another, allowing localized brightness optimization for each color channel.
3Ease of operation
If blue pixel has low bias voltage at intermediate or low gray levels, then the circuit operation is simple, but the brightness of blue sub pixel region is turned on relatively late
Solution Approach 1:
The voltage-dividing switch connected to a specific common electrode line allows the blue sub-pixel to receive a different voltage division ratio compared to other sub-pixels. This compensates for the low bias voltage issue by providing enhanced voltage to the blue sub-pixel, enabling it to turn on at appropriate brightness levels without complicating the overall circuit operation.
Data Source
AI summary
A pixel-related circuit and a display panel are provided. The pixel-related circuit includes a plurality of pixel groups arranged in an array. The pixel group includes several pixel cells. Each pixel cell includes a first switch, a second switch, a voltage-dividing switch, and a common electrode line.