Liquid-Crystal Display Electrode Structure for White Light Chromaticity
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Solution Overview
Problem
Liquid-crystal displays (LCDs) face a challenge in maintaining accurate white light chromatic coordinates due to the brightness gain disparity between red, green, and blue sub-pixels, leading to a shade of white light.
Innovation Solution
The LCD design incorporates a first and second electrode layer with striped branches on a substrate, where the pitch and angle of these branches differ between sub-pixels, particularly in the blue sub-pixel, to adjust the chromatic coordinates of white light by altering the electric field strength and orientation of liquid-crystal molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the brightness of the LCD is increased, then the brightness gain of red and green sub-pixels is improved, but the chromatic coordinates of white light shift due to the blue sub-pixel having much less brightness gain
Solution Approach 1:
The patent applies different pitches and/or angles of striped branches to different sub-pixels (red, green, blue) to create local variations in electric field characteristics. Specifically, the blue sub-pixel is configured with different pitch and/or angle parameters compared to red and green sub-pixels, allowing localized adjustment of blue light output to compensate for its lower brightness gain, thereby maintaining accurate white light chromatic coordinates while enabling overall brightness increase
Solution Approach 2:
The patent changes the geometric parameters (pitch and angle) of the striped branches in the blue sub-pixel relative to red and green sub-pixels. By adjusting these parameters, the electric field strength and orientation in the blue sub-pixel are modified to enhance its brightness gain, thereby compensating for the inherent disparity and preventing chromatic coordinate shift of white light when overall brightness is increased
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 effectively adjusts the chromatic coordinates of white light by increasing the blue tristimulus value, reducing the shift towards a shade of white light, thereby improving the display's color accuracy and transmittance.
Implementation Method 1
The liquid-crystal layer is disposed between the first and second electrode layers
Implementation Method 2
a vertical alignment liquid-crystal display
Implementation Method 3
the first electrode layer corresponding to one of the sub-pixels includes a first main trunk, a second main trunk crossed the first main trunk, and a plurality of striped branches
Implementation Method 4
adjust the chromatic coordinates of white light by altering the electric field strength and orientation of liquid-crystal molecules
Data Source
AI summary
A liquid-crystal display includes a first substrate including several sub-pixels. A micro-structure layer is formed on the first substrate, and the micro-structure layer corresponding to one of the sub-pixels includes a first main trunk portion, a second main trunk portion crossed the first main trunk portion, and several striped branch portions. The striped branch portions are connected with the first and second main trunk portions, wherein an angle is formed between the striped branch portions and the first main trunk portion, and the striped branch portions are alternately arranged with a pitch. A first electrode layer is conformally formed on the micro-structure layer. Specifically, the pitch in one of the sub-pixels is different from the pitch in another one of the sub-pixels, or the angle in one of the sub-pixels is different from the angle in another one of the sub-pixels.