Liquid Crystal Display Slit and Insulating Layer Response Time
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Solution Overview
Problem
Liquid crystal display (LCD) devices, particularly those using the multi-domain vertical alignment (MVA) mode, face challenges in response rate when switching from high-tone to low-tone displays, leading to increased response time due to the propagation of inclination information in liquid crystal molecules.
Innovation Solution
The introduction of a slit and an insulating layer on the pixel electrode and opposite electrode, respectively, creates additional originating points for liquid crystal molecule inclination, reducing the distance between these points and allowing for uniform orientation, thereby decreasing the response time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If MVA mode is used to improve viewing angle characteristics, then viewing angle is improved, but response time increases when switching from high-tone to low-tone display
Solution Approach 1:
The invention divides the pixel electrode into multiple regions by forming slits, creating multiple independent liquid crystal domains within each pixel. This segmentation allows different regions to respond independently to voltage changes, accelerating the overall response time while maintaining the vertical alignment mode's viewing angle advantages
Solution Approach 2:
The invention applies different structural features (slits and insulating layers) to specific locations within the pixel electrode to create localized orientation control. The slits are positioned at specific locations to generate electric field distortion that induces liquid crystal inclination at those particular points, enabling localized response initiation that propagates rapidly across the entire pixel
2Ease of manufacture
If liquid crystal molecules are vertically oriented during OFF voltage without rubbing process, then manufacturing is simplified, but propagation rate of inclination information decreases
Solution Approach 1:
The invention pre-structures the pixel electrode with slits and insulating layers during manufacturing to create predetermined inclination initiation points. These features are built in advance to automatically generate the necessary electric field distortion and liquid crystal inclination when voltage is applied, eliminating the need for post-manufacturing rubbing processes while ensuring rapid response propagation
Solution Approach 2:
The slits and insulating layers act as intermediary structures that mediate between the applied voltage and the liquid crystal molecules. They distort the electric field distribution to create localized inclination regions that serve as intermediaries for propagating the orientation change signal across the entire liquid crystal layer, accelerating the response without requiring mechanical rubbing
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 implementation of slits and insulating layers significantly reduces the response time of liquid crystal molecules, improving display quality by accelerating the switching process from black to gray tones, with response times improved from approximately 100 ms to less than 100 ms.
Implementation Method 1
orientation of liquid crystal molecules included in a liquid crystal layer is controlled using structures or electrode slits provided on a substrate
Implementation Method 2
liquid crystal molecules are vertically oriented during an OFF voltage
Data Source
AI summary
According to one embodiment, a liquid crystal display apparatus includes a first substrate including a first electrode and an insulating layer arranged so as to cover an edge of the first electrode, a second substrate including a second electrode facing the first electrode and a second slit from which the second electrode is removed, and a liquid crystal layer interposed between the first substrate and the second substrate. The first electrode includes a plurality of first slits extending inwardly from the edge of the first electrode. The insulating layer and the plurality of first slits are arranged such that a position of an end of the insulating layer and a position of a tip to which the first slit extends are apart from each other in a region between the edge of the first electrode and the second slit in a direction in which the first slit extends.