Liquid Crystal Display Device Dual White Structures Viewing Angle
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Solution Overview
Problem
Conventional liquid crystal display devices, particularly in the MVA mode, suffer from inadequate compensation of viewing angle for intermediate gradations, leading to degraded display quality when viewed obliquely, with intermediate gradations appearing whitish due to insufficient luminance control.
Innovation Solution
A liquid crystal display device with a dot-matrix type configuration that includes a gradation control unit managing two white display structures, one using primary colors and the other with a different chromaticity, allowing for independent or combined control of gradation levels in each pixel to maintain consistent display quality across viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional MVA mode liquid crystal display device is used, then the viewing angle can be increased and symmetry of viewing angle characteristics can be improved, but the compensation of viewing angle at the time of displaying intermediate gradations is insufficient and intermediate gradations appear whitish when observed in an oblique direction
Solution Approach 1:
The pixel is divided into multiple sub-pixels (first sub-pixel, second sub-pixel, third sub-pixel) with different color filter configurations. Each sub-pixel has a specific color filter (first color, second color, third color) with different transmittance characteristics, allowing independent control of light transmission for each color component to achieve accurate intermediate gradation display while maintaining wide viewing angle characteristics
Solution Approach 2:
Different color filters are assigned to different sub-pixels within the same pixel based on their specific transmittance characteristics. The first color filter has higher transmittance in the first wavelength range, the second color filter has higher transmittance in the second wavelength range, and the third color filter has higher transmittance in the third wavelength range, creating local optical quality variations that enable precise color and gradation 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
The solution enhances color reproduction range and display quality regardless of the viewing angle by linearizing relative brightness variations across gradation levels, preventing intermediate gradations from appearing whitish and improving overall image quality.
Implementation Method 1
a liquid crystal layer held between a pair of substrates
Implementation Method 2
the inclination of an electric field, which is applied to the pixel region from the pixel electrode and counter-electrode, is controlled. The pixel region of the liquid crystal layer is divided into, e.g. four domains such that the alignment directions of liquid crystal molecules are inclined at 90° to each other in a voltage-on state
Implementation Method 3
a negative retardation plate is used to compensate the viewing angle dependency of the phase difference of the liquid crystal layer
Data Source
AI summary
A liquid crystal display device includes a display section which enables color display in each of pixels, and a gradation control unit which controls a gradation level in each of the pixels. The display section includes a first white display structure which is configured to combine primary colors and to display white, and a second white display structure which is configured to include a color with a chromaticity different from a chromaticity of the primary color of the first white display structure and to display white. The gradation control unit has a first control mode in which the gradation level of each pixel is controlled by one of the first white display structure and the second white display structure, and a second control mode in which the gradation level of each pixel is controlled by a combination of the first white display structure and the second white display structure.