Circular Light Reduction Unit for LCD Bright Point Defects
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Solution Overview
Problem
Conventional liquid crystal display devices suffer from bright point defects caused by foreign matter during manufacturing, leading to increased display luminance and quality degradation, with existing solutions like laser-induced light reduction units experiencing distortion and light leakage.
Innovation Solution
A liquid crystal display device design featuring circular light reduction units with varying transmittance regions on translucent substrates, where the first light reduction unit has a higher transmittance in the center and lower transmittance in the surrounding spiral region, and a second light reduction unit with similar configurations, to effectively cover and minimize bright point defects without causing significant distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light reduction unit is formed by irradiating the translucent substrate with a laser beam while scanning, then the bright point defect is covered, but distortion is generated in the region where the scanning direction is turned back and light leaks from the distortion
Solution Approach 1:
The light reduction unit is designed with non-uniform light reduction characteristics, having a first region and a second region with different light reduction amounts. The first region (where scanning direction turns back) has a smaller light reduction amount, while the second region has a larger light reduction amount, compensating for distortion-induced light leakage in specific areas
Solution Approach 2:
The light reduction unit is formed in advance to cover the bright point defect, with the scanning pattern and light reduction distribution pre-planned to minimize distortion effects. The distortion-prone regions are identified and compensated for in the design phase
2Reliability
If the light reduction unit covers the bright point defect region completely, then the defect is hidden, but the distortion causes light to leak and the defect remains visible
Solution Approach 1:
Different regions of the light reduction unit have different light reduction amounts tailored to their specific functions. The first region provides baseline coverage while the second region provides enhanced light reduction to prevent leakage from distortion areas
Solution Approach 2:
The distortion, which initially causes light leakage, is converted into a benefit by strategically positioning the second region with higher light reduction amount in areas where distortion occurs, turning the distortion-prone regions into effectively sealed areas
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
Prevents deterioration of display quality by concentrating distortion in central regions and reducing light leakage, ensuring consistent luminance and image quality.
Implementation Method 1
laser light is irradiated inside the glass substrate to form light reduction unit
Data Source
AI summary
A display device includes a first translucent substrate, a second translucent substrate that is disposed on a display surface side while opposed to the first translucent substrate, and a first light reduction unit that reduces a transmission amount of visible light while overlapping a bright point defect portion in planar view in at least one of the first translucent substrate and the second translucent substrate. The first light reduction unit has a circular shape including a first region disposed in a center and a second region disposed around the first region, and transmittance to the visible light in the first region is higher than transmittance to the visible light in the second region.