Display Substrate Light Shielding Layer for High PPI VR
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Solution Overview
Problem
In high pixel density virtual reality products using LCD technology, the compressed pixel pitch and reduced black matrix size lead to ineffective light blocking by the black matrix, causing light leakage and color cross issues, which affect display quality and user experience.
Innovation Solution
A display substrate design that includes a first base substrate with scanning and data lines forming sub-pixels, a common electrode layer, and a first light shielding layer with light shielding portions between sub-pixels, which effectively blocks light leakage and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel pitch is continuously compressed to increase PPI, then the display density is improved, but the black matrix size is reduced leading to ineffective light blocking
Solution Approach 1:
The patent introduces a first light shielding layer in the array substrate at a position between the pixel electrode and the common electrode, creating an additional dimensional barrier for light blocking. This layered approach in the vertical dimension complements the black matrix in the planar dimension, effectively preventing light leakage even when pixel pitch is compressed.
Solution Approach 2:
The first light shielding layer acts as an intermediary component between the pixel electrode and the common electrode. It specifically blocks light from the pixel electrode that would otherwise leak into adjacent pixels, serving as a mediating structure that prevents harmful light propagation without requiring reduction of the black matrix.
2Measurement precision
If the black matrix size is compressed to maintain high PPI, then the display density is improved, but alignment fluctuations cause color cross issues
Solution Approach 1:
By positioning the first light shielding layer in the vertical dimension between the pixel electrode and common electrode, the patent creates a light blocking mechanism that is less sensitive to in-plane alignment fluctuations. This vertical positioning provides a more robust light blocking function that compensates for manufacturing variations in the black matrix alignment.
Solution Approach 2:
The first light shielding layer is pre-positioned between the pixel electrode and common electrode to provide a buffer against light leakage before alignment issues can manifest. This preliminary light blocking structure compensates for potential alignment deviations by providing an additional light blocking barrier that maintains effectiveness despite manufacturing variations.
3Measurement precision
If the pixel pitch is compressed to increase PPI, then the display density is improved, but light leakage between adjacent pixels increases
Solution Approach 1:
The patent addresses light leakage by introducing a light shielding layer in the vertical dimension between the pixel electrode and common electrode. This vertical positioning creates an additional barrier that blocks light from escaping between adjacent pixels, effectively combating the light leakage problem caused by compressed pixel pitch without sacrificing display density.
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
The display substrate improves display quality by preventing light leakage and crosstalk between sub-pixels, enhancing user experience and meeting high pixel density requirements.
Implementation Method 1
a first light shielding layer in contact with the common electrode layer, including a plurality of first light shielding portions extending in the second direction; where the first light shielding portions are in areas between the sub-pixels adjacent in the first direction
Data Source
AI summary
A display substrate includes: a first base substrate; scanning lines a side of the first base substrate, extending in a first direction; and arranged in a second direction data lines at the same side of the first base substrate as the scanning lines and in a different layers from the scanning lines, extending in the second direction and arranged in the first direction; a common electrode layer at a side of the scanning lines and the data lines facing away from the first base substrate; and a first light shielding layer in contact with the common electrode layer, and including first light shielding portions extending in the second direction. The first direction intersects with the second direction. The first light shielding portions are in areas between adjacent sub-pixels in the first direction.