Liquid Crystal Display Blue Pixel Slit Configuration
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Solution Overview
Problem
Transverse electric-field liquid crystal displays suffer from a yellow shift when viewed obliquely, which is not effectively addressed by existing techniques, and these solutions often increase costs due to stringent color specifications and material thickness requirements.
Innovation Solution
A liquid crystal display configuration with a color filter substrate and thin-film-transistor substrate, where the blue pixel has a different opening distance and slit configuration compared to red and green pixels, reducing oblique light reduction and correcting the yellow shift to white.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the width of BM's opening in green pixel is reduced compared to red and blue pixels, then color uniformity is improved, but yellow shift is advanced
Solution Approach 1:
The patent applies local quality by setting different first distances for different color pixels (blue vs. red/green) while maintaining consistent black matrix opening widths across all pixels. Specifically, the first distance for blue coloring material is made different from that of red and green coloring materials, allowing each color region to be optimized independently for its optical characteristics without compromising overall color uniformity or introducing yellow shift.
2Manufacturing precision
If cell gap is regulated for each RGB according to representative wavelength, then display color change is prevented, but costs increase due to stringent material specifications
Solution Approach 1:
The patent changes the geometric parameter of the opening distance from the black matrix to different values for different color pixels. By making the first distance for blue coloring material different from that of red and green coloring materials, the patent achieves color accuracy correction without imposing stringent thickness restrictions on coloring materials, thereby avoiding cost increases associated with specialized material development.
3Ease of manufacture
If uniform opening width is used for all pixels, then manufacturing is simplified, but yellow shift occurs when viewed obliquely
Solution Approach 1:
The patent maintains manufacturing simplicity by keeping black matrix opening widths uniform across all pixels, but introduces local quality differentiation by setting different first distances for blue pixels compared to red and green pixels. This approach eliminates yellow shift while avoiding complex manufacturing processes, as the differentiation is achieved through a single parameter change rather than multiple geometric modifications.
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 minimizes oblique light reduction in blue pixels compared to red and green pixels, correcting the yellow shift to white and potentially reducing manufacturing costs.
Implementation Method 1
an electric field is formed between a pixel electrode and a counter electrode that are disposed on a thin-film-transistor (TFT) substrate, in parallel with a surface of a liquid crystal layer
Implementation Method 2
the directors (orientations) of liquid crystals are made to change to be almost parallel to the surface of the liquid crystal layer, thereby regulating the amount of transmitted light
Implementation Method 3
coloring materials of a plurality of colors disposed in the respective plurality of openings
Data Source
AI summary
Provided is a technique for correcting a yellow shift to white. A liquid crystal display includes the following: a color filter substrate including a black matrix provided with a plurality of openings, and coloring materials of a plurality of colors disposed in the respective plurality of openings; an upper electrode having a plurality of slits for each opening; and a lower electrode. The plurality of colors include blue and two or more different colors other than blue. With respect to a first distance being a distance between an end of a drive region and an end of the opening corresponding to the plurality of slits, the first distance corresponding to the blue coloring material is different from the first distance corresponding to each of the coloring materials of the different colors.