Triangular Patterned Reflective Electrode for LCD Light Efficiency
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Solution Overview
Problem
Semi-transmissive LCD devices face challenges in achieving uniform light efficiency and contrast ratio between reflective and transmissive areas due to differences in light passage through the color filter layer, leading to variations in color purity and luminance between the two areas.
Innovation Solution
The introduction of a transparent layer within the reflective area of the LCD device, featuring a specific triangular patterned organic layer and reflective electrode with quadrangular pyramid shapes, allows external light to be directly incident and reflected, passing through the color filter layer only once, mimicking the light passage in the transmissive area, thus enhancing reflective light efficiency and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a dual cell gap structure is adopted to adjust cell gap in transmissive area to be two times that of reflective area, then light efficiency uniformity and contrast ratio are improved, but device complexity increases
Solution Approach 1:
The pixel is divided into reflective area and transmissive area with different cell gap structures. The reflective area has a first cell gap while the transmissive area has a second cell gap that is two times the first cell gap, achieved through separate spacers in each area. This segmentation allows independent optimization of light efficiency in each area without requiring complex adjustable mechanisms.
2Use of energy by moving object
If reflective electrode is disposed in reflective area and transparent electrode in transmissive area, then power consumption is reduced and visibility is improved, but color purity uniformity between areas deteriorates
Solution Approach 1:
Different electrode structures are applied to different areas: the reflective area has a reflective electrode that reflects backlight to maintain low power consumption, while the transmissive area has a transparent electrode that allows direct light transmission for better visibility. This local differentiation optimizes each area's function while the patent addresses color uniformity through additional color filter layers.
3Manufacturing precision
If color filter layer is disposed over reflective electrode, then color display is achieved, but light efficiency uniformity between reflective and transmissive areas deteriorates
Solution Approach 1:
The color filter layer is segmented into a first color filter layer over the reflective electrode and a second color filter layer over the transparent electrode. This segmentation allows independent optimization of color properties in each area, enabling uniform color display while maintaining different light efficiency characteristics suitable for each area's function.
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 configuration improves the efficiency of reflective light and achieves uniform color reproducibility across the LCD device, aligning the light efficiency of the reflective and transmissive areas, thereby enhancing the overall display quality.
Implementation Method 1
an image is displayed by reflecting external light in the reflective area
Implementation Method 2
an image is displayed by allowing light provided from a backlight unit to pass through in the transmissive area
Data Source
AI summary
A liquid crystal display device includes an insulation substrate including a transmissive area and a reflective area, an organic layer positioned on the insulation substrate, and including a triangular pattern in the reflective area, a reflective electrode including reflective patterns corresponding to the triangular pattern of the organic layer in the reflective area, a color filter layer positioned on the reflective electrode, and including an opening for exposing a partial area of the reflective pattern, and a transparent layer disposed inside the opening of the color filter layer.