Liquid Crystal Display Pixel Electrode Slit Configuration
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Solution Overview
Problem
Liquid crystal display devices have poor transmittance ratios despite advancements in thinness, lightness, and performance.
Innovation Solution
The solution involves a pixel arrangement and structure with sloped slits in pixel electrodes and a common electrode configuration that improves the transmittance ratio by optimizing the aperture ratio and minimizing the width of the black matrix, using high-mobility oxide semiconductors and symmetric slit orientations to enhance viewing angles and prevent liquid crystal disclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional pixel structures are used, then device complexity is reduced, but transmittance ratio deteriorates
Solution Approach 1:
The pixel electrode is divided into multiple segments with different slit orientations (first pixel electrode with slits in first direction, second pixel electrode with slits in second direction). This segmentation allows each segment to optimize light transmission in specific orientations, collectively improving overall transmittance ratio without requiring complete structural redesign
Solution Approach 2:
Adjacent pixel electrodes are designed with asymmetric slit orientations relative to each other (one with slits in first direction, adjacent with slits in second direction). This asymmetric arrangement optimizes the aperture ratio by reducing the width of black matrices between pixels while maintaining liquid crystal alignment and preventing disclination
2Illumination intensity
If aperture ratio is increased to improve transmittance, then transmittance ratio improves, but viewing angle stability deteriorates
Solution Approach 1:
The pixel array is segmented into different domains with alternating slit orientations. This domain segmentation ensures that light transmission is optimized across multiple orientations, maintaining stable viewing characteristics from different angles while achieving higher aperture ratios
Solution Approach 2:
Different regions of the display are assigned different slit orientations locally optimized for their position. This local quality variation ensures that each region maintains proper liquid crystal alignment and viewing angle characteristics specific to its location, while collectively achieving high overall transmittance
Data Source
AI summary
A liquid crystal display device including first, second, and third data lines extending in a first direction on a substrate, the second data line positioned between the first and third data lines; a plurality of gate lines extending in a second direction on the substrate; at least one pixel unit including a first pixel electrode formed in a first pixel area between the first and third data lines intersecting the gate lines, at one side of a first gate line, and a second pixel electrode formed in a second pixel area between the first and third data lines, at another side of the first gate line; and at least one circuit unit formed between the first pixel area and the second pixel area and including a first transistor in which a first electrode of the first transistor is connected to the first data line and a second electrode of the first transistor is connected to the first pixel electrode, and a second transistor in which a third electrode of the first transistor is connected to the third data line and a fourth electrode of the first transistor is connected to the second pixel electrode.