Liquid Crystal Display Frame Region Light Leakage
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Solution Overview
Problem
Conventional liquid crystal display devices suffer from light leakage in the frame region due to the alignment state of liquid crystal molecules, which affects display quality and is difficult to correct without causing defects.
Innovation Solution
The solution involves aligning the first alignment film in the frame region according to the polarization axis direction of the first polarization plate, while the second alignment film is left untreated in the corresponding region, allowing more liquid crystal molecules to align with the polarization axis direction, thereby reducing light leakage and maintaining display quality without defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the second alignment film is provided with alignment treatment in the frame region, then liquid crystal molecules can be aligned, but light leakage occurs due to misalignment with the polarization axis direction
Solution Approach 1:
The patent applies different alignment treatments to different regions of the second alignment film. Specifically, the frame region is left without alignment treatment while the display region receives alignment treatment. This local differentiation allows liquid crystal molecules in the frame region to naturally align with the polarization axis direction, preventing light leakage, while maintaining proper alignment in the display region for normal operation.
2Object-affected harmful factors
If the resin black matrix thickness is increased to reduce light leakage, then light shielding improves, but the cell thickness increases reducing response rate
Solution Approach 1:
The patent replaces the mechanical approach of increasing black matrix thickness with an optical/alignment-based solution. By controlling the alignment state of liquid crystal molecules through selective alignment treatment of the alignment film, the patent achieves light leakage prevention without adding physical thickness to the cell structure, thereby maintaining fast response rates.
3Ease of manufacture
If alignment treatment is applied to the entire alignment film, then manufacturing is simplified, but light leakage occurs in the frame region affecting display quality
Solution Approach 1:
The patent implements local quality by distinguishing between the frame region and display region for alignment treatment. The frame region is intentionally left untreated to allow natural alignment of liquid crystal molecules with the polarization axis, preventing light leakage. The display region receives alignment treatment to ensure proper liquid crystal alignment for image display. This regional differentiation resolves the contradiction between manufacturing simplicity and display quality.
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 suppresses light leakage in the frame region, enhancing display qualities without introducing defects, by aligning liquid crystal molecules appropriately between the treated and untreated alignment film portions.
Implementation Method 1
In the photo-alignment, a photo-alignment film is used as a material for the alignment film, and the photo-alignment film is exposed to light such as UV light, and thereby the photo-alignment film is provided with an alignment regulating force
Implementation Method 2
The alignment treatment is made, for example, by rubbing, photo-alignment, and the like. According to the rubbing, an alignment film surface is rubbed with a cloth wound on a roller
Data Source
AI summary
The present invention provides a liquid crystal display device capable of improving display qualities in a frame region and a production method thereof. The present invention is a liquid crystal display device including:first and second substrates facing each other;a liquid crystal layer arranged between the first and second substrates;first and second alignment films arranged on liquid crystal layer side-surfaces of the first and second substrates, respectively; andfirst and second polarization plates,the first polarization plate being arranged on a side opposite to the liquid crystal layer side of the first substrate,the second polarization plate being arranged on a side opposite to the liquid crystal layer side of the second substrate,wherein the first alignment film has an alignment portion in a frame region,an alignment direction of the alignment portion being in accordance with a polarization axis direction of the first polarization plate, andthe second alignment film has a non-alignment portion for which an alignment treatment is not provided,the non-alignment portion of the second alignment film is positioned in a region corresponding to the alignment portion of the first alignment film.