Liquid Crystal Panel Ring-Shaped Conductive Film for Dark Stripe Reduction
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Solution Overview
Problem
The formation of dark stripes in liquid crystal panels due to fringing fields affects the transmission rate and contrastness, particularly in UV2A technology where orthogonal-vertical-optical-alignment methods lead to electrical field-induced misalignment of liquid crystal molecules.
Innovation Solution
The configuration of a ring-shaped conductive film with gaps on the TFT and CF substrates, where the gaps are symmetrical with respect to the edges of the ring-shaped conductive film, reduces the fringing electrical field effect, thereby minimizing dark stripes and enhancing transmission rate and contrastness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the second conductive film dimension is increased to cover more area, then the electrical field coverage is improved, but dark stripes increase due to enhanced fringing field effects at the edges
Solution Approach 1:
The second conductive film is segmented by introducing gaps at its edges, dividing the continuous conductive structure into sections. This segmentation reduces the fringing field effects at the edges while maintaining the overall coverage area, thereby decreasing dark stripe formation without sacrificing electrical field coverage.
Solution Approach 2:
The gaps are strategically positioned only at the edges of the second conductive film where fringing fields occur, rather than uniformly across the entire structure. This local modification targets the specific problem area (edge fringing fields) while preserving the conductive film's functionality in the central region, reducing dark stripes without compromising overall performance.
2Shape
If the first conductive film and second conductive film are aligned centrally, then the optical symmetry is improved, but fringing fields still cause dark stripes in the peripheral regions
Solution Approach 1:
By introducing gaps at the edges of the second conductive film, the continuous conductive structure is segmented. This segmentation eliminates the fringing field effects at the peripheral regions where dark stripes form, while the central alignment of the first and second conductive films is maintained to preserve optical symmetry.
3Area of stationary object
If the conductive films are made larger to improve coverage, then the electrical field distribution is improved, but the transmission rate decreases due to increased dark stripe formation
Solution Approach 1:
The second conductive film is segmented with gaps at its edges, reducing the fringing field effects that cause dark stripes. This allows the conductive film to maintain a large coverage area for good electrical field distribution while the gaps prevent energy loss through dark stripe formation, thereby improving transmission rate.
Solution Approach 2:
Gaps are introduced only at the edges of the second conductive film where fringing fields occur, rather than reducing the overall film area. This local modification maintains the large coverage area for electrical field distribution while specifically targeting the edge regions to reduce dark stripe formation and improve transmission rate.
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 effectively reduces the occurrence of dark stripes, thereby improving the transmission rate and contrastness of the liquid crystal panel by avoiding the fringing electrical field impact on the liquid crystal molecules.
Implementation Method 1
UV2A configures additive having phototaxis on the alignment film, and adopts linearly polarized UV light to radiate on the alignment film. As such, the alignment film controls the alignment of the liquid crystal molecules so as to control the rotation of the liquid crystal molecules.
Implementation Method 2
Fringing fields may be generated between the top and down substrates of the liquid crystal panel. The fringing field applies the electrical field force toward the liquid crystal molecules between the two substrates so as to affect the rotation of the liquid crystal molecules.
Data Source
AI summary
The present disclosure discloses a liquid crystal panel and a liquid crystal device. The liquid crystal panel includes a thin film transistor (TFT) substrate and a color filter (CF) substrate opposite to each other. Each of sub-pixel areas of the TFT substrate is configured with a first conductive film, and each of sub-optical-filter areas of the CF substrate is configured with a second conductive film opposite to the first conductive film, the first conductive film and the second conductive film are rectangular. A central point of the first conductive film projects on the central point of the second conductive film. A dimension of the second conductive film is greater than the dimension of the first conductive film, and a ring-shaped conductive film is formed in an area of the first conductive film not covered by the second conductive film.