Pixel Opening Light Shielding Layout for Reduced Color Shift
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Solution Overview
Problem
Electronic devices with displays face challenges in achieving high resolution and process yield while minimizing color shift at large viewing angles, often requiring additional metal layers or wider black matrices, which reduce opening rate and transmittance.
Innovation Solution
The electronic device incorporates a substrate with data lines, scan lines, and a light shielding pattern where the ratio of the light shielding pattern's width to the spaced distance between the edges of the opening region is between 0.3 to 0.7, allowing for a balance between color shift and opening rate, and the light shielding pattern can be disposed adjacent to the opening region or integrated with the existing light shielding layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metal layers are added to block light or the width of the black matrix on the pixels is increased to solve color shift at large viewing angle, then color shift is reduced, but the opening rate is reduced which affects transmittance
Solution Approach 1:
The patent changes the geometric parameters of the light shielding pattern, specifically setting the width of the first portion to be 0.3 to 0.7 times the spaced distance between opposite edges of the opening region. This parameter optimization allows the light shielding pattern to effectively block oblique light (reducing color shift) while maintaining sufficient opening rate for adequate transmittance.
Solution Approach 2:
The light shielding pattern is positioned partially within the pixel region rather than covering the entire black matrix area. The first portion is located between extending lines of opposite edges of the opening region, providing just enough light blocking to reduce color shift without excessively reducing the opening rate.
2Object-affected harmful factors
If the width of the black matrix is increased to block light, then color shift is reduced, but the opening rate is reduced
Solution Approach 1:
The patent optimizes the width parameter of the light shielding pattern's first portion to be 0.3 to 0.7 times the spaced distance between opposite edges of the opening region. This parameter change achieves effective color shift reduction while maintaining adequate opening rate.
Solution Approach 2:
The light shielding pattern is positioned to cover only the critical regions where oblique light enters, rather than increasing the overall black matrix width. The first portion is strategically located between extending lines of the opening region edges, providing partial light blocking action that suffices for color shift reduction without excessive area occupation.
Data Source
AI summary
An electronic device includes a substrate, two data lines, two scan lines, an opening region and a light shielding pattern. The two data lines are adjacently disposed on the substrate. The two scan lines are adjacently disposed on the substrate and extend along a first direction. The two data lines and the two scan lines define a pixel. The opening region is disposed corresponding to the pixel and has a first edge and a second edge disposed opposite to each other and extending along the first direction. There is a spaced distance between the first edge and the second edge in a second direction perpendicular to the first direction. The light shielding pattern is disposed adjacent to the opening region and includes a first portion located between a first extending line of the first edge and a second extending line of the second edge.