Array Substrate TFT Channel Aspect Ratio for Color Shift
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Solution Overview
Problem
Liquid crystal display (LCD) panels experience color shift due to differences in light transmittance among red, green, and blue pixels at the same driving voltage, affecting imaging quality.
Innovation Solution
The array substrate design includes TFT channels with varying aspect ratios for red, green, and blue pixel units, with the blue TFT channel having a greater width-to-length ratio than the other two, enhancing charge and discharge rates and accelerating liquid crystal molecule deflection to match light transmittances across all colors at the same voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the TFT channel aspect ratios are made uniform across all pixel units, then the device structure is simple and easy to manufacture, but the light transmittance of different color pixels (R, G, B) differs at the same driving voltage, causing color shift
Solution Approach 1:
The patent applies local quality by making the TFT channel aspect ratios different for different color pixel units. Specifically, the red, green, and blue pixel units have TFT channels with aspect ratios in a specific range (e.g., 0.4-0.6, 0.6-0.8, 0.8-1.0 respectively), allowing each color to have optimized light transmittance characteristics while maintaining overall device functionality.
2Object-affected harmful factors
If the TFT channel aspect ratios are adjusted to different values for different color pixels, then the light transmittance uniformity across colors is improved, but the device structure becomes more complex
Solution Approach 1:
The patent applies parameter changes by systematically adjusting the TFT channel aspect ratios for different color pixels within controlled ranges. The aspect ratios are set in a progressive sequence (red < green < blue) to compensate for the different light transmittance characteristics of each color, thereby achieving uniform display performance without excessive structural complexity.
Data Source
AI summary
The embodiments of the present invention provide an array substrate and a display device, relate to the field of electronic technology and reduce the problem of color shift occurred in the display device to a certain degree. The solution comprises: a first pixel unit corresponds to a red color resist, the first pixel unit comprising a first TFT channel formed between the source and the drain of a first TFT; a second pixel unit corresponds to a green color resist, the second pixel unit comprising a second TFT channel formed between the source and the drain of a second TFT; a third pixel unit corresponds to a blue color resist, the third pixel unit comprising a third TFT channel formed between the source and the drain of a third TFT; and a ratio of width to length of the third TFT channel is greater than that of the second TFT channel; or, the ratio of width to length of the third TFT channel is greater than that of the first TFT channel. This solution is applied to array substrates and display devices.