Display Panel Color Filter Layout for High-PPI Crosstalk Blocking
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Solution Overview
Problem
Color crosstalk occurs frequently in high pixel density displays due to the small size and spacing of sub-pixels, leading to issues with light shielding and display quality.
Innovation Solution
A display panel design featuring a substrate with sub-pixels that include adjacent color filters with different light transmittance levels, where the second color filter has lower transmittance and includes multiple sub-layers to block crosstalk light, ensuring light passes through two filters with lower transmittance in non-emitting regions.
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 light transmittance is reduced and display brightness is lowered
Solution Approach 1:
The patent applies different light transmittance characteristics to different regions of the color filter. The first color filter has higher light transmittance in its light-transmitting portion, while the second color filter has lower light transmittance in its light-transmitting portion. This local differentiation allows the light-emitting regions to maintain high brightness while the non-emitting regions effectively block crosstalk light, resolving the contradiction between preventing color crosstalk and maintaining display brightness.
2Productivity
If the spacing between adjacent sub-pixels is reduced to increase pixel density, then display resolution is improved, but color crosstalk becomes more severe
Solution Approach 1:
The patent changes the light transmittance parameter of the color filters to resolve the contradiction. By designing the second color filter with lower light transmittance compared to the first color filter, the patent enables effective crosstalk blocking even when sub-pixels are closely spaced. This parameter modification allows high pixel density to be achieved without suffering from severe color crosstalk, as the differential transmittance creates an optical barrier between adjacent sub-pixels.
3Ease of manufacture
If a single-layer color filter is used, then manufacturing is simple, but optical selectivity is insufficient to prevent crosstalk
Solution Approach 1:
The patent employs a composite color filter structure consisting of a first color filter and a second color filter with different light transmittance characteristics. This composite design enhances optical selectivity and crosstalk prevention capability compared to a single-layer filter. The combination of two filters with complementary transmittance properties creates a more effective optical barrier while maintaining manufacturing feasibility through standard layering processes.
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
This design effectively reduces light transmittance in non-emitting regions, enhancing light blocking and preventing crosstalk between adjacent sub-pixels, thereby improving display quality and uniformity.
Implementation Method 1
the second color filter has lower transmittance and includes multiple sub-layers to block crosstalk light
Data Source
Figure 1~2A
Figure 2B~2C
Figure 2D~3
AI summary
A display panel (10) and a display device. A plurality of sub-pixels (01, 02, 03) of the display panel (10) are disposed on a main surface (1a) of a substrate (1), a color film of the plurality of sub-pixels (01, 02, 03) comprises a first color film (21) and a second color film (22) that are adjacent to one another, the first color film (21) and the second color film (22) having different light transmission colors, and the light transmittance of the second color film (22) being less than the light transmittance of the first color film (21); a first light-transmitting portion (210) of the first color film (21) allows light to pass through so as to be emitted from the display panel (10), and a first peripheral portion of the first color film (21) surrounds the first light-transmitting portion (210) and comprises a first part (211) that is located on the side of the first light-transmitting portion (210) close to the second color film (22); a second light-transmitting portion (220) of the second color film (22) allows light to pass through so as to be emitted from the display panel (10), and a second peripheral portion of the second color film (22) surrounds the second light-transmitting portion (220) and comprises a first part (221) that is located on the side of the second light-transmitting portion (220) close to the first color film (21); and the first part (221) of the second peripheral portion comprises a first sub-layer (221a) and a second sub-layer (221b) that overlap in the longitudinal direction and are spaced apart from one another, and in the longitudinal direction, the first part (211) of the first peripheral portion is located between the first sub-layer (221a) and the second sub-layer (221b).