Display Panel Transistor Width-to-Length Ratio Adjustment
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Solution Overview
Problem
Current display panels experience color difference and color shift due to identical channel design values for transistors in sub-pixels, leading to undesirable yellowish effects when viewed from the side.
Innovation Solution
A display panel design with a pixel array featuring sub-pixels having transistors with varying width-to-length ratios, where the second ratio is smaller than the first and the third ratio is larger than the first, to adjust the side view performance and minimize color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If identical channel design values (W/L ratio) are used for transistors in each sub-pixel, then the device complexity is reduced and manufacturing is simplified, but color difference and color shift occur when viewing from the side
Solution Approach 1:
The patent applies local quality by assigning different width-to-length ratio values to transistors in different sub-pixels (red, green, blue). Specifically, the red sub-pixel uses a first ratio, the green sub-pixel uses a second ratio, and the blue sub-pixel uses a third ratio. This localized differentiation compensates for the different optical RGB retardation characteristics of each sub-pixel, eliminating color shift when viewed from the side while maintaining simplified manufacturing processes.
2Object-affected harmful factors
If different width-to-length ratios are used for transistors in different sub-pixels, then color shift is reduced, but the device complexity increases
Solution Approach 1:
The patent implements parameter changes by systematically varying the width-to-length ratios of transistors across different sub-pixels. The red sub-pixel uses a first ratio value, the green sub-pixel uses a second ratio value, and the blue sub-pixel uses a third ratio value. These parameter adjustments are designed to compensate for the different optical retardation characteristics of each color channel, reducing color difference and improving side-view performance while maintaining reasonable device complexity.
Data Source
AI summary
A low color shift display panel includes a pixel array. The pixel array includes a first sub-pixel and a second sub-pixel. Each of the first sub-pixel and second sub-pixel respectively includes a data line, a gate line, a first transistor coupled to the data line and a first liquid crystal capacitor, a second transistor coupled to the data line and a second liquid crystal capacitor, and a third transistor coupled to a common voltage and the second transistor. The first sub-pixel has a first ratio which is the width-to-length ratio of the third transistor divided by the width-to-length ratio of the second transistor. The second sub-pixel has a second ratio which is the width-to-length ratio of the third transistor divided by the width-to-length ratio of the second transistor. The second ratio is smaller than the first ratio.