Four-Color LCD Pixel Electrodes with Curved Data Lines
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) face issues with poor optical efficiency and color concentration due to the arrangement of red, green, and blue sub-pixels, and the addition of a white sub-pixel for improved luminance often results in suboptimal color representation.
Innovation Solution
A four-color LCD design is implemented with red, green, blue, and white sub-pixels, where the white sub-pixel is smaller than the others, and the sub-pixels are arranged in a specific pattern with curved data lines and uniform lengths to enhance optical efficiency and color concentration, using sub-pixel rendering techniques to improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a white sub-pixel is added to improve luminance, then brightness is improved, but color concentration deteriorates
Solution Approach 1:
The patent applies local quality by making the white sub-pixel smaller than the red, green, and blue sub-pixels. This differential sizing allows the white sub-pixel to contribute to overall luminance while minimizing its negative impact on color concentration in specific color regions. Each sub-pixel type is optimized in size according to its functional requirements.
Solution Approach 2:
The patent changes the size parameter of the white sub-pixel relative to other sub-pixels. By reducing the white sub-pixel area while maintaining or increasing the area of color sub-pixels, the system achieves both improved brightness (through the white sub-pixel) and maintained color concentration (through larger color sub-pixels).
2Ease of manufacture
If data lines are made straight for simplicity, then ease of manufacture is improved, but signal delay uniformity deteriorates
Solution Approach 1:
The patent applies curvature to the data lines, making them curved rather than straight. The curved data lines are designed to pass between sub-pixels in a manner that equalizes their lengths, ensuring uniform signal delay across all pixels while remaining manufacturable through standard photolithography processes.
3Ease of manufacture
If sub-pixels are arranged in conventional patterns, then ease of manufacture is improved, but optical efficiency deteriorates
Solution Approach 1:
The patent employs asymmetric sub-pixel arrangement where the white sub-pixel is positioned and sized differently from the red, green, and blue sub-pixels. This asymmetric layout optimizes the aperture ratio and light transmission paths, improving optical efficiency while maintaining compatibility with conventional manufacturing processes.
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
The design enhances optical efficiency and color concentration while maintaining brightness, providing improved image quality and suitable for various image types by selecting appropriate sub-pixel arrangements and rendering configurations.
Implementation Method 1
a LC layer with dielectric anisotropy interposed therebetween. The variation of the voltage difference between the field generating electrodes, i.e., the variation in the strength of an electric field generated by the electrodes changes the transmittance of the light passing through the LCD
Data Source
AI summary
A four color liquid crystal display (LCD) including red, green, blue, and white sub-pixels are provided. The LCD also includes a plurality of gate lines for transmitting gate signals to the sub-pixels and a plurality of data lines for transmitting data signals to the sub-pixels. The white sub-pixel is smaller than the other sub-pixels, and each of the data lines passes between adjacent two sub-pixels and includes at least one curved portion. Furthermore, the lengths of the data lines are substantially uniform.