Display Panel Black Matrix Edge Design for Gray Scale Transition
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Solution Overview
Problem
Current liquid crystal display panels face issues with unsmooth gray scale transition and poor display due to inconsistent transition sub-pixel opening regions, particularly in special-shaped screens, where the black matrix either intrudes into or fails to consistently shield light-emitting regions, leading to visual burrs and inconsistent brightness.
Innovation Solution
The display panel design includes a black matrix on the opposite substrate that defines transition sub-pixel opening regions with straight edges, ensuring these openings are smaller than main sub-pixel openings and consistently sized, with areas gradually increasing from the non-display region to the main display region, preventing protrusion into sub-pixels and maintaining consistent gray scale transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the black matrix is designed to shield light-emitting regions in the transition display region, then light leakage and color mixing are prevented, but the opening regions become inconsistent in size and shape, causing unsmooth gray scale transition and visual burrs
Solution Approach 1:
The patent applies different edge designs to different regions of the black matrix. Specifically, the first edge (closer to the display region) has a first shape while the second edge (closer to the non-display region) has a second shape. This local differentiation allows the black matrix to effectively shield light at critical boundaries while maintaining consistent opening region sizes across the transition display region, thereby preventing both light leakage and visual burrs simultaneously.
2Object-affected harmful factors
If the black matrix intrudes into transition sub-pixels to shield light, then light leakage is prevented, but the opening region area becomes inconsistent, leading to unsmooth gray scale transition
Solution Approach 1:
The patent changes the geometric parameters of the black matrix by defining different shapes for different edges. The first edge has a first shape and the second edge has a second shape, which are specifically designed to compensate for the intrusion effect. This parameter modification ensures that even when the black matrix intrudes into transition sub-pixels, the overall opening region area remains consistent across all transition sub-pixels, maintaining smooth gray scale transition while still preventing light leakage.
3Object-affected harmful factors
If the transition sub-pixel opening regions are made smaller to prevent light leakage, then light shielding is improved, but the areas vary across different regions, causing inconsistent brightness
Solution Approach 1:
The patent introduces asymmetry in the black matrix design by defining different shapes for the first edge and second edge. This asymmetric design allows the opening regions to be consistently sized across the transition display region while still providing effective light shielding. The first shape and second shape are specifically configured to balance the light shielding requirement with the brightness consistency requirement, ensuring that all transition sub-pixels have uniform opening areas despite the asymmetric black matrix structure.
Data Source
AI summary
A display panel and a display device are disclosed. The display panel includes: an array substrate and an opposite substrate; the display panel includes a display region and a non-display region, the display region includes a main display region and a transition display region, the transition display region has a plurality of transition pixel units, and each of the transition pixel units includes a plurality of transition sub-pixels; and a black matrix defines a plurality of transition sub-pixel opening regions in the transition display region, an orthographic projection of an edge of each transition sub-pixel opening region close to the gate line on the array substrate falls within an orthographic projection of the corresponding transition sub-pixel on the array substrate, and the edge is in a shape of a straight line.