IPS Display Pixel Electrode Orientation for Transmittance
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Solution Overview
Problem
In-plane switching (IPS) type liquid crystal display devices experience reduced image quality and transmittance due to the dual-domain structure, where the direction change in electrodes leads to ineffective pixel areas and color shifts with viewing angles.
Innovation Solution
The IPS type liquid crystal display device incorporates a matrix arrangement of pixels with specific electrode configurations, including first, second, and third pixels with electrodes extending in different directions, and wider pixel widths in the row direction to enhance transmittance and reduce color shifts, along with optimized scanning signal line placement to minimize parasitic capacitance and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a dual-domain structure is used to improve viewing angle characteristics, then color shifts are canceled out, but transmittance is reduced due to ineffective pixel areas
Solution Approach 1:
The patent applies local quality by creating different electrode configurations in different regions of the pixel. Specifically, the pixel is divided into first and second regions with electrodes extending in different directions (first direction and second direction respectively), allowing each region to optimize for its specific viewing angle while maintaining overall transmittance by eliminating dead zones through proper electrode design
2Adaptability or versatility
If electrodes extend in different directions to create dual-domain structure, then image quality is improved across viewing angles, but pixel effective area is reduced
Solution Approach 1:
The patent resolves the area loss by transitioning from a single-direction electrode design to a multi-dimensional approach where electrodes extend in both first and second directions within the same pixel plane. This dimensional expansion allows the pixel to maintain full effective area while providing viewing angle adaptability through the dual-domain electrode configuration
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 transmittance and maintains image quality across various viewing angles by utilizing dual-domain pixel electrodes and adjusting pixel widths and scanning signal line arrangements, resulting in uniform light intensity and reduced power consumption.
Implementation Method 1
The liquid crystal display device is a device to display an image by changing the alignment of a liquid crystal composition sealed between two substrates with a change in electric field, and controlling the degree of transmission of light passing through the two substrates and the liquid crystal composition.
Implementation Method 2
In order to change the electric field, a voltage corresponding to the gray-scale value of each of pixels is applied to a pixel electrode via a pixel transistor of each of the pixels.
Data Source
AI summary
A liquid crystal display device includes a display area in which pixels are disposed in a matrix with rows and columns. The display area includes first and second configuration columns. The first configuration column is a column where first pixels are aligned. The first pixels each include a pixel electrode including first and second areas. In the first area, electrodes extending in a first direction inclined to the column direction are disposed. In the second area, electrodes extending in a second direction inclined differently from the first direction are disposed. The second configuration column is a column where second and third pixels are alternately aligned. The second pixels each include a pixel electrode including electrodes extending in a third direction inclined to the column direction. The third pixels each include a pixel electrode including electrodes extending in a fourth direction inclined differently from the third direction.