Liquid Crystal Display White Sub-Pixel Filter Removal
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Solution Overview
Problem
Liquid crystal display devices with red, green, blue, and white sub-pixel regions face increased fabrication costs and complexity due to the need for a white color filter, which complicates the manufacturing process and reduces color purity.
Innovation Solution
A liquid crystal display device with red, green, and blue sub-pixel regions, where the white sub-pixel region omits the white color filter, simplifying the fabrication process and reducing costs, and a method of driving the device that adjusts gray levels and uses different gamma reference voltages to compensate for cell gap differences, ensuring display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a white color filter is added to the liquid crystal display device to improve brightness, then brightness is improved, but fabrication complexity and cost increase
Solution Approach 1:
The patent removes the white color filter from the liquid crystal display device structure. By extracting this component, the fabrication process is simplified and cost is reduced, while the brightness improvement is maintained through alternative means such as optimized color filter design and driving circuit control.
2Illumination intensity
If a white color filter is added to the liquid crystal display device to improve brightness, then brightness is improved, but manufacturing cost increases
Solution Approach 1:
The white color filter is extracted from the device structure, eliminating the need for additional manufacturing steps and materials. This reduction in components directly lowers manufacturing cost while brightness is maintained through optimized existing components.
3Illumination intensity
If a white color filter is added to the liquid crystal display device, then brightness is improved, but color purity decreases
Solution Approach 1:
By removing the white color filter, the patent eliminates the source of color purity degradation. The color purity is maintained through optimized color filter design and driving circuit control, achieving both brightness improvement and color purity preservation.
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 solution simplifies the fabrication process, reduces costs, and maintains display quality by compensating for color coordinate movements caused by the omission of the white color filter, achieving improved brightness and color reproducibility.
Implementation Method 1
a liquid crystal capacitor 'LC' connected to the thin film transistor 'TFT' is formed in each pixel region. The liquid crystal capacitor 'LC' is turned on/off by the thin film transistor 'TFT,' thereby modulating the transmittance of an incident light and displaying images.
Data Source
AI summary
A liquid crystal display device includes a first substrate and a second substrate facing and spaced apart from each other, a gate line and a data line on the first substrate, the gate line and the data line crossing each other to define red, green, blue and white sub-pixel regions, a thin film transistor connected to the gate line and the data line, a color filter layer consisting of red, green and blue color filters on the second substrate, the red, green and blue color filters corresponding to the red, green and blue sub-pixel regions, respectively, and a liquid crystal layer between the first substrate and the second substrate.