Vertical Alignment LCD Pixel Electrode Cutouts for Viewing Angle and Image Sticking
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Solution Overview
Problem
In vertical alignment mode liquid crystal displays, the intensity of the electric field is poor in areas with cutouts, leading to slower liquid crystal molecule rearrangement and potential image sticking issues due to singular points that change positions, causing image sticking and reduced viewing angles.
Innovation Solution
The design includes pixel and common electrodes with cutouts that gradually increase or decrease in width along their length, and a black matrix that overlaps these cutouts, dividing the pixel into sub-pixels driven by different transistors to stabilize liquid crystal molecule alignment and prevent image sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cutouts are formed in the field generating electrodes to achieve wide viewing angle, then the viewing angle is improved, but the electric field intensity becomes poor in the cutout portions causing slower liquid crystal molecule rearrangement and image sticking
Solution Approach 1:
The patent applies asymmetry by making the cutouts have different widths at different positions along their length. Specifically, the cutouts have a first width at one end and a second width at the other end, where the widths are different. This asymmetric design creates singular points with fixed positions that stabilize the liquid crystal molecule alignment, preventing image sticking while maintaining the wide viewing angle benefit.
2Adaptability or versatility
If cutouts are formed in the field generating electrodes to divide pixels into multiple domains, then the viewing angle is improved, but singular points with changing positions are generated causing image sticking
Solution Approach 1:
The asymmetric cutout design with different widths at opposite ends creates a stable singular point configuration. The varying width along the cutout length establishes fixed singular points that do not change position during operation, thereby stabilizing the liquid crystal domain structure and preventing image sticking while preserving multi-domain viewing angle benefits.
3Ease of manufacture
If uniform width cutouts are used in the electrodes, then the manufacturing is simplified, but the electric field distribution is poor leading to slower liquid crystal response speed
Solution Approach 1:
The patent applies local quality by varying the width of cutouts at different locations. The cutouts have a first width at one end and a second width at the other end, creating different electric field intensities in different regions. This local variation optimizes the electric field distribution to improve liquid crystal response speed while maintaining manufacturability through a relatively simple asymmetric geometry.
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 lateral visibility and prevents spots or residual images by stabilizing liquid crystal molecule arrangement, ensuring consistent image quality and wider viewing angles.
Implementation Method 1
an electric field is generated in the liquid crystal layer by applying a voltage to the pixel electrode and the common electrodes so as to control an alignment of liquid crystal molecules in the liquid crystal layer
Implementation Method 2
Images are displayed by the liquid crystal displays by controlling polarization of incident light using the alignment of the liquid crystal molecules
Data Source
AI summary
In a vertical alignment liquid crystal display, a thin film transistor is formed on a first insulating substrate, and a pixel electrode (ITO) including cutouts (OPEN) is formed on the first substrate or a second substrate. A width of the cutouts of the upper and lower substrates gradually increases or decreases along a length thereof.