IPS Liquid Crystal Display Pixel Electrode Structure for Viewing Angle and Transmittance
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Solution Overview
Problem
Conventional IPS liquid crystal display devices with multi-domain structures face issues of reduced transmittance and finger pressing marks due to bent electrodes and fringe electric fields, which compromise viewing angle characteristics and image quality, especially at smaller pixel sizes.
Innovation Solution
A lateral-electric-field mode liquid crystal display device with a pixel structure featuring strip-shaped and rectangular pixel electrodes, a grid-form common electrode, and protruding parts, which creates columns for twist deformation without bent electrodes, maintaining high viewing angles and avoiding finger pressing marks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-domain structure with bent electrodes is employed to enhance viewing angle characteristics, then the viewing angle is improved, but the transmittance decreases due to domain boundaries and disclination
Solution Approach 1:
The pixel electrode is divided into multiple domains with different orientation directions, allowing each domain to optimize for specific viewing angles while collectively providing wide viewing angle characteristics. The segmentation creates controlled domain boundaries that manage liquid crystal orientation without excessive disclination.
Solution Approach 2:
Different regions of the pixel electrode are assigned different orientation directions tailored to local viewing requirements. This local optimization allows each region to contribute to wide viewing angles while minimizing transmittance loss in specific areas, rather than applying a uniform structure across the entire pixel.
2Measurement precision
If the pixel size is reduced to increase resolution, then the resolution is improved, but the aperture ratio decreases due to the increased relative area of scanning lines and data lines
Solution Approach 1:
The invention changes the geometric parameters of the electrode structure, specifically the shape and orientation of the pixel electrode, to optimize the aperture ratio for small pixel sizes. By using a segmented design with specific orientation directions, the effective electrode area is maximized relative to the fixed wiring area, thereby improving aperture ratio without sacrificing resolution.
3Adaptability or versatility
If bent electrodes are used to create domain boundaries, then the viewing angle characteristics are improved, but finger pressing marks appear due to disclination at the bent parts
Solution Approach 1:
The pixel electrode is segmented into multiple domains with straight edges rather than bent configurations. This segmentation achieves multi-domain functionality for wide viewing angles while eliminating the bent parts that cause disclination and finger pressing marks, thereby removing the harmful effect while preserving the viewing angle benefit.
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 achieves a large aperture and excellent viewing angle characteristics while preventing finger pressing marks, even at small pixel sizes, by controlling liquid crystal twist deformation through fringe electric fields and maintaining high transmittance.
Implementation Method 1
Each of the at least one strip-shaped pixel electrode and a part of the common electrode extending in parallel with an extending direction of the at least one strip-shaped pixel electrode forms therebetween an electric field to be applied to the liquid crystal layer
Implementation Method 2
The liquid crystal display device further comprises a first rectangular pixel electrode arranged in each of the pixels, being greater in width than the at least one strip-shaped pixel electrode, and connected with one end of each of the at least one strip-shaped pixel electrode to from a T shape. The first rectangular pixel electrode overlaps with corner parts of the opening section of the common electrode, where the corner parts concerned are closer to the first rectangular pixel electrode than the other corner parts of the opening section.
Data Source
AI summary
A lateral-electric-field mode liquid crystal display device includes: substrates; a liquid crystal layer; plural scanning lines and plural data lines crossing on one of the substrates; plural pixels formed by the scanning lines and the data lines; at least one strip-shaped pixel electrode arranged in each pixel and extending along the data line or the scanning line; a common electrode located in a layer closer to the liquid crystal layer than the strip-shaped pixel electrodes so as to cover the scanning lines and the data lines; and a first rectangular pixel electrode connected with one end of each of the at least one strip-shaped pixel electrode to from a T shape. The first rectangular pixel electrode overlaps with corner parts of an opening section of the common electrode, where the corners are closer to the first rectangular pixel electrode than the other corners of the opening section.