IPS LCD Light-Shielding Wiring Layout for Red Color Unevenness
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Solution Overview
Problem
IPS mode LCDs suffer from uneven brightness defects due to impurity ions, which cause red color unevenness and degrade image quality, especially in large-sized displays with fine image qualities.
Innovation Solution
The solution involves an IPS mode LCD design with a light-shielding wiring layout in the peripheral region that matches or exceeds the occupied area of the display region, and a resistivity ratio adjustment in the color filter substrate to equalize light transmittance between the two areas, preventing impurity ion migration and maintaining even brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the peripheral region has high light transmittance to improve visibility, then impurity ions migrate from the peripheral region to the display region, causing red color unevenness and brightness defects
Solution Approach 1:
The patent changes the light transmittance parameter of the peripheral region by adjusting the occupied area of light-shielding wirings. By increasing the wiring occupied area in the peripheral region, the light transmittance is reduced to a level equivalent to or less than the display region, thereby preventing impurity ion migration while maintaining acceptable visibility
Solution Approach 2:
The patent applies different wiring layouts to different regions: the display region uses a first light-shielding wiring layout optimized for display performance, while the peripheral region uses a second light-shielding wiring layout with greater occupied area to control light transmittance and prevent ion migration. This local differentiation resolves the contradiction between visibility and ion migration prevention
2Reliability
If the occupied area of light-shielding wirings in the peripheral region is increased to prevent impurity ion migration, then light transmittance in the peripheral region decreases, but this may affect overall display performance
Solution Approach 1:
The patent precisely controls the light transmittance parameter of the peripheral region by adjusting the wiring layout, ensuring it is equivalent to or less than the display region but not excessively reduced. This optimized parameter setting prevents ion migration while maintaining sufficient visibility
Solution Approach 2:
The patent differentiates the wiring layout between display and peripheral regions, applying the second layout with greater occupied area only where needed for ion migration prevention, rather than uniformly across the entire panel. This localized approach minimizes the impact on overall display performance
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 design effectively reduces the red color unevenness defect and maintains high-quality images by inhibiting impurity ion movement and accumulation, ensuring consistent brightness across the display.
Implementation Method 1
a resistivity ratio of the color filter having the highest resistivity to the color filter having a lowest resistivity is set according to a difference between a light transmittance per unit area in the peripheral region and a light transmittance per unit area in the display region
Implementation Method 2
a first light-shielding wiring layout arranged in the display region, and a second light-shielding wiring layout arranged in the peripheral region
Data Source
AI summary
An image display device, particularly an IPS mode LCD, includes a light source, an array substrate including a display region and a peripheral region around the display region, a color filter substrate including a plurality of color filters having different transmissivities, a liquid crystal layer including a plurality of liquid crystal molecules, and an alignment film for aligning the liquid crystal molecules. Characteristically, a light transmittance per unit area in the peripheral region is equivalent to or less than a light transmittance per unit area in the display region.