Layered Display Substrate Structure for VR Light Leakage Control
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Solution Overview
Problem
High-resolution VR products using liquid crystal displays face issues with light leakage and color crossover due to alignment deviations between display substrates, leading to reduced display effect and user experience.
Innovation Solution
The display substrate design incorporates first and second signal lines with non-overlapping orthographic projections of light-shielding structures, along with second light-shielding structures between layers, to effectively block light leakage and improve alignment accuracy, enhancing the shading effect and reducing the impact of alignment deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional LCD structures are used in high-resolution VR products, then manufacturing is simpler, but light leakage and color crossover occur due to alignment deviations
Solution Approach 1:
The substrate is divided into multiple layers (first substrate, second substrate, third substrate) with distinct functions. The first substrate contains pixel electrodes and first signal lines, the second substrate contains second signal lines and first light-shielding structures, and the third substrate contains second light-shielding structures. This segmentation allows each layer to be optimized independently for its specific function while working together to eliminate light leakage and color crossover issues.
Solution Approach 2:
The patent introduces a third dimension (vertical stacking) to solve the two-dimensional alignment problem. By arranging light-shielding structures in multiple layers at different positions along the vertical direction, the patent creates a three-dimensional shading network that blocks light leakage paths without requiring perfect lateral alignment between components.
2Manufacturing precision
If alignment tolerance is increased to simplify manufacturing, then manufacturing precision decreases, but light leakage and color crossover worsen
Solution Approach 1:
The patent incorporates light-shielding structures in advance within the substrate layers to preemptively block potential light leakage paths. These structures are positioned before final assembly to cushion against alignment deviations that may occur during manufacturing, ensuring that even if alignment is not perfect, light leakage is prevented by the pre-positioned shielding layers.
3Reliability
If more light-shielding structures are added to block light leakage, then display quality improves, but transmittance and opening rate decrease
Solution Approach 1:
The light-shielding structures are strategically positioned only in specific locations where light leakage and color crossover are most likely to occur, such as along the edges of pixel electrodes and signal lines. The shielding structures are not uniformly distributed across the entire substrate but are concentrated in critical areas, maintaining high transmittance in pixel regions while providing effective light blocking at boundaries.
Solution Approach 2:
The patent introduces intermediate light-shielding structures between the pixel electrodes and the external environment. These intermediate structures act as mediators that selectively block harmful light leakage paths while allowing beneficial light to pass through to the liquid crystal layer and out to the viewer, thus protecting display quality without significantly reducing overall transmittance.
4Reliability
If signal lines are arranged in a single layer, then device complexity is lower, but light leakage control is insufficient
Solution Approach 1:
The signal lines are segmented across multiple layers: first signal lines are arranged in a first direction on the first substrate, while second signal lines are arranged in a second direction on the second substrate. This segmentation allows each signal line layer to be optimized for its specific orientation and function, while the layered arrangement naturally creates light-shielding effects between layers without requiring additional dedicated shielding structures for each signal line.
Data Source
AI summary
The display substrate, display device and motherboard provided in the present disclosure include a first base substrate, a plurality of first signal lines, a plurality of second signal lines, and a plurality of pixel electrodes, and the orthographic projection of the pixel electrodes on the first base substrate is within the orthographic projection of the area defined by the intersection of each first signal line and each second signal line; first light-shielding structures are located above the layer where the pixel electrodes are located, each first light-shielding structure extends in the second direction and is arranged along the first direction, the orthographic projections of the first light-shielding structures on the substrate of the first substrate is within the orthographic projection of gaps between the columns of pixel electrodes extending in the second direction, and has an area that does not overlap with the orthographic projection of the second signal line.