Liquid Crystal Display Sub-Pixel Alignment for White Color Tinting
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Solution Overview
Problem
Conventional liquid crystal display devices using horizontal electric field systems face issues with color tinting in white displays due to differing wavelength requirements for red, green, and blue colors, leading to uneven voltage application across sub-pixel areas.
Innovation Solution
The liquid crystal display device incorporates a pair of substrates with a liquid crystal layer and electrodes, where the electrodes are arranged with strip-shaped portions extending in parallel, allowing for adjustable alignment angles to match phase differences for each color, ensuring equal voltage application across sub-pixel areas for optimal white display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a phase difference corresponding to 1/2 wavelength is applied to green color light by setting the liquid crystal layer thickness, then green color display is optimized, but red or blue color light does not receive the correct phase difference due to wavelength differences, causing color tinting in white display
Solution Approach 1:
The patent applies different alignment angles to different sub-pixel areas (red, green, blue) to compensate for wavelength differences. Each color sub-pixel has a specific alignment angle that optimizes the phase difference for its wavelength, thereby achieving accurate white display without color tinting.
Solution Approach 2:
The patent changes the alignment angle parameter for each color sub-pixel to compensate for wavelength differences. By adjusting the alignment angle rather than the liquid crystal layer thickness, the system achieves correct phase differences for all colors simultaneously, eliminating color tinting in white display.
2Manufacturing precision
If the liquid crystal layer thickness is set for green color light, then green color is displayed correctly, but red color light receives a phase difference larger than 1/2 wavelength, causing color distortion
Solution Approach 1:
The patent implements different alignment angles for different color sub-pixels (red, green, blue) to account for their different wavelengths. This local customization of alignment angles ensures that each color receives the appropriate phase difference, maintaining color consistency without requiring different liquid crystal layer thicknesses for each color.
3Ease of operation
If the same voltage is applied to all sub-pixel areas, then device operation is simplified, but color tinting occurs because different wavelengths require different phase differences
Solution Approach 1:
The patent applies different alignment angles to different color sub-pixels, allowing the same voltage to produce the correct phase difference for each wavelength. This approach maintains operational simplicity while eliminating color tinting, as the alignment angle adjustment compensates for wavelength differences without requiring complex voltage control.
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 enables reduced color tinting in white displays by matching phase differences for each color, resulting in consistent luminance across sub-pixel areas when the same voltage is applied, thereby improving the accuracy of color representation.
Implementation Method 1
a phase difference corresponding to 1/2 wavelength is applied to the light transmitted through the liquid crystal layer by applying a voltage between a pair of electrodes and generating a horizontal electric field in the liquid crystal layer
Implementation Method 2
driving liquid crystal molecules constituting the liquid crystal layer by an electric field generated between the first electrode and the second electrode
Implementation Method 3
One of the first and second electrodes is provided at the liquid crystal layer side than the other electrode and is equipped with a plurality of strip-shaped portions arranged so as to extend in parallel with each other with a predetermined space in the sub pixel area
Implementation Method 4
an angle made by an extending direction of the strip-shaped portions and an alignment direction of the liquid crystal molecules in the initial state provided in the sub pixel area displaying a predetermined color among the plurality of colors is set larger than an angle made by an extending direction of the strip-shaped portions and the alignment direction of the liquid crystal molecules in the initial state provided in the sub pixel area displaying a color whose wavelength is relatively shorter than that of the predetermined color
Data Source
AI summary
As means for providing wide viewing angle of a liquid crystal display device by changing the angle made by the alignment direction and the strip-shaped portions, a phase difference applied in the liquid crystal layer can be matched for every sub pixel area displaying each color. According to the aspect of the invention, by changing the angle made by the alignment direction of the alignment layer and the strip-shaped electrodes for every sub pixel area, the phase difference applied in the liquid crystal layer can be matched for wavelength region of displayed color in sub pixel area. Accordingly, the voltage applied between the pixel electrode and the common electrode when luminance becomes the maximum in each sub pixel area becomes equal and white display in which color is reduced can be performed.