Pixel Electrode Sawtooth Frame for HVA Dark Pattern Prevention
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Solution Overview
Problem
High vertical alignment (HVA) mode liquid crystal display panels experience dark patterns and reduced transmission rates due to the structure of pixel electrodes, particularly at the peripheral edges, which affect display brightness and performance.
Innovation Solution
A pixel electrode design featuring a rectangular peripheral frame with sawtooth-like configurations on its edges and branch electrodes arranged in a two-by-two matrix, where the branch electrodes are connected to the peripheral frame and keel electrode, ensuring consistent liquid crystal alignment to prevent dark patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closed pixel electrode structure with peripheral frame and branch electrodes is used, then the electric field distribution is improved and dark lines between electrodes are reduced, but dark patterns occur at the peripheral frame area affecting transmission rate
Solution Approach 1:
The patent applies different structural configurations to different regions of the pixel electrode. The peripheral frame has a specific structure with inclined surfaces, while the branch electrodes have varying inclination angles in different electrode areas. This local differentiation allows the peripheral frame to maintain electric field continuity without creating dark patterns, while the branch electrodes optimize light transmission in their respective zones.
Solution Approach 2:
The peripheral frame is designed with asymmetric inclined surfaces rather than symmetric straight edges. The first and second peripheral frames have inclined surfaces with specific angles relative to the substrate, creating an asymmetric structure that guides liquid crystal alignment uniformly at the peripheral edges, preventing dark patterns while maintaining overall electrode functionality.
2Stability of the object's composition
If the peripheral frame extension direction is different from branch electrode extension directions, then electrode connectivity is maintained, but liquid crystal alignment becomes inconsistent causing dark patterns
Solution Approach 1:
The peripheral frame is designed with asymmetric inclined surfaces rather than symmetric straight edges. The first and second peripheral frames have inclined surfaces with specific angles relative to the substrate, creating an asymmetric structure that guides liquid crystal alignment uniformly at the peripheral edges, preventing dark patterns while maintaining overall electrode functionality.
Solution Approach 2:
The patent applies different structural configurations to different regions of the pixel electrode. The peripheral frame has a specific structure with inclined surfaces, while the branch electrodes have varying inclination angles in different electrode areas. This local differentiation allows the peripheral frame to maintain electric field continuity without creating dark patterns, while the branch electrodes optimize light transmission in their respective zones.
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 proposed pixel electrode design enhances the transmission rate and brightness of HVA mode liquid crystal display panels by preventing dark patterns, thereby improving overall display performance.
Implementation Method 1
a drive voltage is applied to a pixel electrode on the TFT substrate and a common electrode on the CF substrate to control rotation of liquid crystal molecules of the liquid crystal layer in order to refract out light emitting from the backlight module to generate an image
Implementation Method 2
control rotation of liquid crystal molecules of the liquid crystal layer in order to refract out light emitting from the backlight module
Implementation Method 3
uses a layer of polymer that grows on an alignment film to make liquid crystal forming a predetermined pre-tilt angle so as to achieve an effect of surface control of rotation of the liquid crystal
Data Source
AI summary
The present invention provides a pixel electrode. The pixel electrode comprises a peripheral frame electrode that is in an enclosed form and at least one pair of peripheral edges of the peripheral frame electrode are provided, on outer sides thereof, with a sawtooth-like configuration. The sawtooth-like configuration comprises tooth troughs having an extension direction that is substantially parallel to and consistent with an extension direction of branch electrodes of the pixel electrode corresponding thereto so that liquid crystal in an area corresponding to the peripheral frame electrode may incline in the direction of the branch electrodes in the same way as liquid crystal in an inside area of the peripheral frame electrode inclines in such a direction to prevent the occurrence of dark patterns in the area corresponding to the peripheral frame electrode. Application of the pixel electrode to an HVA liquid crystal display panel would effectively improve transmission rate and brightness of the liquid crystal display panel so as to improve the display performance.