Transflective LCD Insulating Layer Light Leakage
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Solution Overview
Problem
Conventional transflective LCD devices suffer from dark-state light leakage, which reduces image contrast and aperture ratio due to unbalanced alignment of crystal molecules and multiple light leakage areas.
Innovation Solution
The transflective LCD device design features an insulating layer disposed either on the color filter or array substrate, with two adjacent sub-pixel regions' reflective areas juxtaposed, reducing light leakage areas to one per sub-pixel region, thereby enhancing image contrast and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the insulating layer is disposed on the color filter or array substrate in conventional transflective LCD devices, then the LCD layer thickness can be adjusted in reflective and transmissive areas, but dark-state light leakage occurs due to unbalanced alignment of crystal molecules, reducing image contrast
Solution Approach 1:
The patent applies asymmetry by creating different LCD layer thicknesses in specific patterns within the same pixel. The insulating layer is strategically positioned to create thicker LCD layers in reflective areas and thinner LCD layers in transmissive areas, achieving both thickness adjustment for manufacturing precision and proper crystal alignment for high image contrast by eliminating dark-state light leakage
Solution Approach 2:
The patent implements local quality by varying the LCD layer thickness locally across different regions of the pixel. The insulating layer is disposed only in specific areas (reflective or transmissive) to create localized thickness variations, allowing the crystal molecules to align properly in each region for their intended function while maintaining overall image contrast
2Manufacturing precision
If multiple light leakage areas exist in conventional transflective LCD devices, then the structure can accommodate the insulating layer for thickness adjustment, but the aperture ratio is reduced due to multiple light leakage areas
Solution Approach 1:
The patent extracts or eliminates the harmful light leakage areas by strategically positioning the insulating layer to create a single, minimized leakage region. Instead of having multiple light leakage areas, the design removes unnecessary leakage paths while preserving the thickness adjustment function, thereby increasing the effective aperture ratio
Solution Approach 2:
The patent changes the geometric parameters of the insulating layer configuration to minimize light leakage areas. By adjusting the position, size, and shape of the insulating layer, the design reduces the number of light leakage areas from multiple to one, thereby increasing the aperture ratio while maintaining the LCD layer thickness adjustment capability
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 design significantly increases image contrast and aperture ratio by minimizing light leakage and aligning crystal molecules, improving display performance in both bright and dark environments.
Implementation Method 1
Flow of current through the TFTs (not numbered in the drawing) results in change of electric field between the array substrate 120 and the CF 110, thereby causing turning of the crystal molecules within the LCD layer 130, which, in turn, alters the polarization thereof
Implementation Method 2
the optical film 150 filters the different biasing light beams so as to achieve the respective brightness in each pixel
Implementation Method 3
a reflective electrode 170 disposed on the reflective area 102
Data Source
AI summary
A transflective LCD device includes an array substrate and a color filter. The substrate includes a plurality gate lines, a plurality of common lines, and a plurality of data lines substantially crossing the gate lines to define a plurality of sub-pixel regions. Each sub-pixel region has a reflective area and a transmissive area. Two of the reflective area of two adjacent sub-pixel regions in the same column are juxtaposed to each other. The color filter has a plurality of sub-pixel regions respectively aligned with the sub-pixel regions of the array substrate. The color filter includes an insulating layer disposed on the reflective area of a respective sub-pixel region. An LC layer is disposed between the array substrate and the color filter.