Display Device Light-Shielding Portions Pitch Optimization
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Solution Overview
Problem
Liquid crystal display devices face light leakage issues due to alignment failures of liquid crystal molecules, which existing technologies attempt to address through light-shielding layers with varying areas and arrangements, but these solutions do not effectively suppress non-uniformity in display caused by differences in aperture ratios between pixels with and without spacers.
Innovation Solution
The display device incorporates a specific configuration of light-shielding layers with varying areas and arrangements adjacent to opening portions, where the light-shielding portions overlapping spacers have larger or smaller areas than those not overlapping spacers, to minimize the visibility of non-uniformity in display by optimizing the pitch of opening portions based on color and spacer types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding layer with larger area is used to overlap spacers to prevent light leakage, then light leakage is suppressed, but aperture ratio decreases and display non-uniformity increases
Solution Approach 1:
The patent applies local quality by making the light-shielding layer have different areas at different locations: a first area at a first position (without spacer) and a second area at a second position (with spacer). This allows the light-shielding effect to be optimized locally at each position rather than using a uniform design, thereby preventing light leakage at spacer locations while maintaining aperture ratio and display uniformity at other locations.
2Object-affected harmful factors
If the area of light-shielding layer is increased to suppress light leakage, then light shielding effectiveness improves, but aperture ratio difference between pixels with and without spacers increases
Solution Approach 1:
The light-shielding layer is designed with local quality by having different areas at different positions. At positions without spacers, the light-shielding layer has a first area that maintains aperture ratio. At positions with spacers, the light-shielding layer has a second area (larger than the first) that specifically addresses light leakage. This localized approach ensures that aperture ratio is optimized for each position rather than uniformly reduced across all pixels.
3Object-affected harmful factors
If light-shielding portions are arranged to overlap spacers to prevent light leakage, then light leakage is reduced, but non-uniformity in display becomes more visible
Solution Approach 1:
The patent applies parameter changes by carefully controlling the area parameters of the light-shielding layer. The first area (without spacer) and second area (with spacer) are designed with specific area relationships that balance light shielding effectiveness with display uniformity. By optimizing these area parameters, the patent reduces the visibility of non-uniformity while still preventing light leakage at spacer locations.
Data Source
AI summary
According to one embodiment, a display device comprises first to sixth opening portions and first to third light-shielding portions, the first light-shielding portion being adjacent to the first and second opening portions, the first opening portion having an area larger than an area of the second opening portion, the second light-shielding portion being adjacent to the third and fourth opening portions, the third and fourth opening portions each having substantially an equal area to the first opening portion, the third light-shielding portion being adjacent to the fifth and sixth opening portions, the fifth and sixth opening portions each having substantially an equal area to the second opening portion.