Color Filter Peripheral Structure for High-PPI Crosstalk Blocking
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Solution Overview
Problem
In high pixel density display apparatus, color crosstalk occurs due to small sub-pixel sizes and close spacings, leading to light leakage between adjacent sub-pixels, which existing shading black matrices struggle to effectively block.
Innovation Solution
A display panel design featuring sub-pixels with adjacent color filters of different light transmittance, where the second color filter has lower transmittance and includes a peripheral portion with overlapping sub-layers to enhance light blocking in non-emitting regions, preventing crosstalk by allowing light to pass through only in intended areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shading black matrix is used to block crosstalk light between sub-pixels, then color crosstalk is prevented, but the light-blocking effect is insufficient when sub-pixel spacing is very small (3-8 μm)
Solution Approach 1:
The color filter's peripheral portion is designed with different light transmittance characteristics than the light-transmitting portion. Specifically, the peripheral portion has lower light transmittance to enhance light blocking in regions adjacent to other color filters, while the light-transmitting portion maintains high transmittance for normal light passage. This local differentiation of optical properties directly addresses the insufficient light-blocking effect in high-density displays.
Solution Approach 2:
The patent changes the light transmittance parameter of the color filter by introducing a peripheral portion with deliberately reduced transmittance. This parameter modification allows the same color filter structure to serve dual functions: maintaining color accuracy in the light-transmitting region while providing enhanced light blocking in the peripheral region adjacent to other sub-pixels, thereby improving the overall light-blocking effectiveness without requiring additional black matrix structures.
2Productivity
If sub-pixel size is reduced to increase pixel density (PPI), then display resolution is improved, but spacing between adjacent sub-pixels decreases leading to increased color crosstalk
Solution Approach 1:
By making the peripheral portion of the color filter have different optical properties (lower light transmittance) compared to the light-transmitting portion, the design locally enhances light blocking capability at the boundaries between sub-pixels. This allows high pixel density to be achieved with smaller sub-pixel spacing while the peripheral portions prevent color crosstalk between adjacent sub-pixels.
Solution Approach 2:
The peripheral portion of the color filter acts as an intermediary structure between adjacent sub-pixels. It serves as a transition zone that mediates the optical interaction between neighboring sub-pixels by absorbing or blocking stray light, thereby preventing color crosstalk while allowing the sub-pixels to be positioned closer together for high PPI.
3Illumination intensity
If light transmittance of color filters is increased to improve light efficiency, then display brightness is improved, but light blocking capability in non-emitting regions is reduced
Solution Approach 1:
The color filter is designed with spatially varying light transmittance: the light-transmitting portion has high transmittance to maximize display brightness and light efficiency, while the peripheral portion has low transmittance to prevent light leakage in non-emitting regions. This local quality differentiation resolves the contradiction between brightness and light blocking capability.
Solution Approach 2:
The color filter is segmented into functionally distinct regions: a light-transmitting portion for color transmission and brightness, and a peripheral portion for light blocking. This segmentation allows each region to be optimized for its specific function, achieving both high brightness and effective light blocking without compromise.
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 solution effectively reduces light transmittance in non-emitting regions, achieving better light blocking and preventing crosstalk between adjacent sub-pixels, thereby improving display quality in high PPI displays.
Implementation Method 1
light transmittance of the second color filter is smaller than light transmittance of the first color filter; the second color filter includes a peripheral portion... effectively reduces light transmittance in non-emitting regions, achieving better light blocking
Data Source
AI summary
The embodiments of the present disclosure provides a display panel and a display apparatus, a first color filter and a second color filter that are adjacent and have different light transmission colors, light transmittance of the second color filter is smaller than light transmittance of the first color filter; the first peripheral portion of the first color filter surrounds the first light-transmitting portion and includes a first portion close to the second color filter; the second peripheral portion of the second color filter surrounds the second light-transmitting portion and includes a first portion close to the first color filter; the first portion of the second peripheral portion includes a first sub-layer and a second sub-layer that overlap in the longitudinal direction and spaced apart from each other, and the first portion of the first peripheral portion is between the first sub-layer and the second sub-layer in the longitudinal direction.