Liquid Crystal Display Panel Color Washout Alignment Angle
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Solution Overview
Problem
Liquid crystal display panels, particularly in IPS and FFS modes, suffer from color washout due to differences in transmittance-voltage curves and transmittance at film interfaces for red, green, and blue light, leading to imbalanced white point and chromaticity.
Innovation Solution
The solution involves setting different alignment angles between the liquid crystal molecules and branch electrodes in sub pixel areas for red, green, and blue, with the blue sub pixel area having the smallest alignment angle, to modulate transmittance-voltage curves and improve color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the thickness of the blue color light resist B is increased to increase the CF substrate thickness in the blue sub pixel area, then the cell gap becomes smaller and color balance is achieved, but the manufacturing complexity and precision requirements increase
Solution Approach 1:
The patent applies different alignment angles specifically in the blue sub pixel area compared to red and green sub pixel areas. This local differentiation allows the blue area to have enhanced brightness without requiring increased CF substrate thickness or reduced cell gap, thereby avoiding the manufacturing precision issues while achieving color balance.
Solution Approach 2:
The patent changes the alignment angle parameter in the blue sub pixel area (setting it to a smaller angle than red and green areas) to modulate the transmittance-voltage curve. This parameter change compensates for the lower transmittance of blue light at film interfaces without requiring physical structural modifications that would increase manufacturing difficulty.
2Measurement precision
If post circuit design is used to adjust GAMMA curves of red, green and blue light to satisfy white dot chromaticity, then color accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent changes the alignment angle parameter during the manufacturing process to directly optimize the transmittance-voltage curves for different colors. This approach achieves accurate white dot chromaticity through structural parameter optimization rather than requiring complex post-manufacturing circuit adjustments, thereby reducing device complexity while maintaining measurement precision.
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 approach enhances the brightness of the blue sub pixel at 255 gray scale, compensating for lost transmittance at film interfaces and ensuring white dot chromaticity meets optical specifications, thereby improving color washout issues.
Implementation Method 1
the upper alignment film and the lower alignment film are alignment films which can achieve horizontal alignment
Implementation Method 2
the light of backlight module is reflected to generate images by applying driving voltages to the two glass substrate for controlling the rotations of the liquid crystal molecules
Data Source
AI summary
The present invention provides a liquid crystal display panel of improving color washout, setting different alignment angles in the sub pixel areas of different colors (the included angle between the alignment direction of the liquid crystal molecules and the branch electrode of the pixel electrode). Then, the alignment angle of the red sub pixel area is the largest, and the alignment angle of the green sub pixel area is smaller, and the alignment angle of the blue sub pixel area is smallest. Thus, it is possible to respectively modulate the transmittance-voltage curves and the brightness-voltage curves of the lights of different colors to optimize the white dot chromaticity for satisfying the optical specification and compensate the losing transmittance of the blue light in the panel for improving the color washout problem.