Liquid Crystal Display Pixel Electrode Corner Control
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Solution Overview
Problem
In vertical alignment mode liquid crystal displays, the aperture ratio and controllability of liquid crystal molecules in the corner region of pixels are compromised, leading to reduced visibility and transmittance, especially at side viewing angles.
Innovation Solution
A slit pattern is introduced in the pixel electrode to space branch electrodes, with a liquid crystal control pattern in the corner region, and horizontal and vertical incisions in the common electrode to create domains, enhancing the alignment and control of liquid crystal molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fine slits are formed in the pixel electrode to define multiple branched electrodes, then the alignment control of liquid crystal molecules is improved, but the aperture ratio decreases
Solution Approach 1:
The patent applies different electrode configurations to different regions of the pixel electrode. The corner region has a specific electrode pattern while the central region has a different pattern, allowing optimized control in each region without uniformly reducing the aperture ratio across the entire pixel.
Solution Approach 2:
The pixel electrode is divided into multiple regions with different electrode patterns - corner regions with specific control patterns and central regions with different configurations. This segmentation allows independent optimization of each region's function while maintaining overall aperture ratio.
2Manufacturing precision
If fine slits are formed in the pixel electrode to define multiple branched electrodes, then the alignment control of liquid crystal molecules is improved, but the controllability in corner regions is lowered
Solution Approach 1:
The patent provides specialized electrode patterns specifically for corner regions, with different configurations than the central region. This local quality approach ensures that corner regions receive dedicated control mechanisms to maintain controllability while achieving alignment control.
3Area of stationary object
If the aperture ratio is increased, then the transmittance is improved, but the control over liquid crystal molecules in corner regions deteriorates
Solution Approach 1:
The electrode structure is segmented into corner-specific patterns and central patterns, allowing the aperture ratio to be maximized in the central region while maintaining effective control patterns in the corner regions through specialized electrode configurations.
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 visibility and transmittance while maintaining a high aperture ratio, by effectively controlling the liquid crystal molecules' alignment and response speed, particularly at corner regions and side viewing angles.
Implementation Method 1
The liquid crystal display generates an electric field in the liquid crystal layer by applying a voltage to the field-generating electrode, determines the direction of the liquid crystal molecules in the liquid crystal layer through the electric field
Implementation Method 2
the liquid crystal is realigned by a fringe field formed between the edge of the incision and the field-generating electrode facing the incision, such that a plurality of domains may be provided
Data Source
AI summary
A liquid crystal display includes: a first panel including a first electrode; a second panel including a second electrode; and a liquid crystal layer between the first and second panels. The first electrode includes: a central electrode disposed in a central region of a pixel; an outer electrodes extending along a side of the central electrode; and a connection electrode which connects the outer electrode and the central electrode. A slit pattern is defined in the first electrode around the central electrode, and a liquid crystal control pattern is defined in the first electrode in a corner region of the pixel. Horizontal and vertical incisions, which divide the first electrode into a plurality of domains, are defined in the second electrode, an end portion of the outer electrode is disposed to correspond to the corner region, and the end portion of the outer electrode extends farther than the central electrode.