Transverse Electric Field LCD Panel Slit Electrode Brightness
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Solution Overview
Problem
In transverse electric field mode liquid crystal display panels, the aperture ratio is reduced due to the inability to form an electric field in the desired direction at the ends of slit-shaped openings in the upper electrode, leading to brightness deterioration when the light-shielding film shields the brightly displayed regions of the slit-shaped openings.
Innovation Solution
The liquid crystal display panel design includes a pair of substrates with a liquid crystal layer, lower electrodes, an insulating film, and upper electrodes with slit-shaped openings that extend along signal or scanning lines, where the edges of the slit-shaped openings do not overlap with the light-shielding film, allowing for a brighter display by preventing light shielding and maintaining a high aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the slit-shaped openings are disposed to extend in a vertical direction to reduce reduction in aperture ratio, then the aperture ratio is improved, but the brightly displayed regions of the circumferences of the slit-shaped openings are shielded from light by the light-shielding film, causing brightness deterioration
Solution Approach 1:
The patent applies different functional requirements to different regions of the slit-shaped opening. The main body portion of the opening is optimized for light transmission (aperture ratio), while the edge regions are specifically positioned to avoid overlap with light-shielding films. This local differentiation allows the opening to simultaneously achieve high aperture ratio and prevent brightness deterioration at the edges.
Solution Approach 2:
The patent resolves the contradiction by introducing a positional dimension constraint - the edge of the main body portion is positioned at a specific location that does not overlap with the light-shielding film in plan view. This dimensional positioning strategy allows the slit-shaped opening to extend vertically for high aperture ratio while the edge is horizontally positioned to avoid light shielding, thus maintaining display brightness.
2Stability of the object's composition
If the slit-shaped openings are connected to each other to form multi-domain, then the color variation in accordance with viewing angle is reduced, but the aperture ratio is reduced due to inability to form electric field in desired direction at both ends
Solution Approach 1:
The patent segments the upper electrode into multiple regions with slit-shaped openings that extend in different directions (positive and negative domains). Each domain's slit-shaped openings are connected to form continuous structures, creating multi-domain configuration. This segmentation approach enables color uniformity across viewing angles while the specific edge positioning maintains high aperture ratio.
Solution Approach 2:
The patent merges the slit-shaped openings in different domains by connecting them to form continuous structures. The positive and negative domain openings are combined in a coordinated manner, creating a unified electrode structure that achieves both color uniformity through multi-domain configuration and high aperture ratio through optimized edge positioning that avoids light-shielding film overlap.
3Ease of manufacture
If the edges of the slit-shaped openings overlap with the light-shielding film, then the manufacturing is simplified, but the brightest areas are shielded from light causing brightness deterioration
Solution Approach 1:
The patent replaces mechanical alignment tolerance considerations with a design-based positional constraint. Instead of relying on manufacturing precision to avoid overlap, the invention explicitly designs the edge position of the main body portion to be at a location that does not overlap with the light-shielding film in plan view. This design substitution maintains brightness while simplifying manufacturing by providing clear positional guidance.
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 enhances the display brightness and aperture ratio by ensuring that the brightest areas of the slit-shaped openings are not shielded by the light-shielding film, while also reducing color variation and ripple issues, resulting in improved image quality and reduced brightness deviation.
Implementation Method 1
a device which displays an image in such a manner that a direction of liquid crystal molecules aligned in a predetermined direction by performing a rubbing process on an alignment film is changed by an electric field and an amount of transmitted light or an amount of reflected light is varied
Implementation Method 2
a direction of liquid crystal molecules aligned in a predetermined direction by performing a rubbing process on an alignment film is changed by an electric field
Implementation Method 3
the transverse electric field mode liquid crystal display panel mainly applies an electric field oriented in a horizontal direction to liquid crystal molecules by providing a pair of electrodes so as to be insulated from each other in the inside of one of a pair of substrates
Implementation Method 4
a direction of liquid crystal molecules aligned in a predetermined direction by performing a rubbing process on an alignment film
Data Source
AI summary
A liquid crystal display panel includes a pair of substrates which are opposed to each other, and a liquid crystal layer which is interposed between the pair of substrates. One of the pair of substrates is provided with a plurality of scanning lines and a plurality of signal lines which are arranged in a matrix shape in a display area. Lower electrodes are each formed in each of sub-pixel areas partitioned by the plurality of scanning lines and the plurality of signal lines. An insulating film is formed in the display area so as to cover the lower electrodes. Upper electrodes are formed in the display area through the insulating film, and each have a plurality of slits in each of the sub-pixel area, and an alignment film which is formed on the upper electrodes and slit-shaped openings close to the liquid crystal layer.