Transreflective LCD White Subpixel Reflective Area Optimization
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Solution Overview
Problem
Transreflective LCDs with RGBW technology face inconsistent percentages of effective output light in both reflective and transmissive modes, leading to decreased display quality due to unequal reflective and transmissive areas of subpixels.
Innovation Solution
Optimizing the reflective area of the white subpixel to be smaller than that of red, green, and blue subpixels and inserting an uncolored block into each of the R, G, and B regions on the color filter to balance luminance and chrominance, ensuring consistent effective output light in both modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the reflective area of the white subpixel is made equal to that of R, G, and B subpixels to maintain manufacturing simplicity, then the manufacturing process remains simple, but the percentages of effective output light become inconsistent in reflective and transmissive modes, decreasing display quality
Solution Approach 1:
The patent applies local quality by making the reflective area of the white subpixel different from that of the R, G, and B subpixels. Specifically, the white subpixel is configured with a smaller reflective area and larger transmissive area to compensate for its higher light transmittance, thereby achieving consistent effective output light percentages across all subpixels in both reflective and transmissive modes.
2Reliability
If the transmissive area of the white subpixel is increased to improve light output consistency, then the effective output light percentages become consistent in both modes, but the reflective area decreases, affecting reflective mode performance
Solution Approach 1:
The patent applies parameter changes by adjusting the area parameters of the white subpixel. The white subpixel is configured with a smaller reflective area and larger transmissive area compared to R, G, and B subpixels. This parameter adjustment compensates for the white subpixel's higher light transmittance, ensuring that the effective output light percentages are consistent across all subpixels in both reflective and transmissive modes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution achieves balanced luminance and chrominance in transreflective LCDs by optimizing the reflective and transmissive areas of subpixels, enhancing image quality and consistency across different lighting conditions.
Implementation Method 1
an LCD includes a pair of panels each having an electrode on inner surface, and a dielectric anisotropic liquid crystal layer interposed between the panels. In the LCD, the variation of the voltage difference between the field generating electrodes, e.g., the variation in the strength of an electric field generated by the electrodes, changes the transmittance of the light passing through the LCD
Implementation Method 2
The pixel electrode 120 has an opaque portion 124 capable of reflecting ambient light
Implementation Method 3
The B region 153 absorbs 2⁄3 of the ambient light 283 when the ambient light 283 passes through the B region 153
Data Source
AI summary
A transreflective liquid crystal display comprises a plurality of pixels. Each pixel includes at least four subpixels including a white subpixel, a red subpixel, a green subpixel and a blue subpixel. Each subpixel comprises a transmissive area and a reflective area. The reflective area of the white subpixel is smaller than that of each of the R, G, and B subpixels so that the percentages of effective output light of the white subpixel and the other colored subpixels are consistent in both reflective and transmissive modes.