OLED Display Panel Aperture Black Matrix Design
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Solution Overview
Problem
Existing OLED display panels face issues with non-uniformity and color deviation due to the presence of a black matrix during the manufacturing of color filters, leading to reduced light emission efficiency and increased reflectivity.
Innovation Solution
A display panel design that incorporates a touch dielectric layer with apertures and a black matrix within these apertures, along with a color filter layer, which improves light transmittance and reduces the thickness of the panel, thereby eliminating horn defects and enhancing display uniformity and anti-reflection capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a black matrix is produced first and then a color filter layer is coated, then the color filter can be formed on the display panel, but horn defects occur at the position where the color filter overlaps the black matrix, causing non-uniformity display
Solution Approach 1:
The patent divides the black matrix structure into multiple segments: a first black matrix layer and a second black matrix layer separated by a first spacer layer. This segmentation prevents the color filter material from forming horn defects by eliminating the direct overlap between the color filter and the black matrix, while still achieving the desired light blocking function through the multi-layer structure.
Solution Approach 2:
The patent employs a nested structure where the first black matrix layer is positioned at a first level, the second black matrix layer is positioned at a second level (lower than the first level), and they are separated by the first spacer layer. This nested arrangement allows the color filter to be formed without direct contact with the black matrix, preventing horn defects while maintaining the light blocking capability.
2Object-affected harmful factors
If a circular polarizer is attached to the light-exiting surface to reduce reflectivity, then anti-reflection effect is improved, but about half of the emitted light is absorbed, reducing light emission effect
Solution Approach 1:
The patent extracts the light blocking function from the traditional circular polarizer and relocates it to the black matrix structure within the display panel. By removing the circular polarizer from the light-exiting surface, the harmful light absorption is eliminated while the anti-reflection function is maintained through the optimized black matrix and color filter arrangement.
Solution Approach 2:
The patent introduces a color filter layer as an intermediary between the light-emitting layer and the external environment. This color filter layer provides the necessary light blocking and color definition functions that were previously handled by the circular polarizer, while allowing more light to pass through to the external surface.
3Object-affected harmful factors
If the black matrix is positioned to block light effectively, then anti-reflection capacity is improved, but horn defects cause non-uniformity display at overlapping positions
Solution Approach 1:
The black matrix is segmented into two separate layers (first black matrix layer and second black matrix layer) positioned at different levels and separated by a spacer layer. This segmentation eliminates the direct overlap between the black matrix and color filter, preventing horn defects while maintaining effective light blocking capability through the multi-layer structure.
Solution Approach 2:
The patent resolves the overlap problem by introducing a vertical dimension separation. The first black matrix layer is at a first level and the second black matrix layer is at a second level (lower than the first level), creating a stepped structure that eliminates horizontal overlap issues while maintaining vertical light blocking effectiveness.
Data Source
AI summary
A display panel is provided, including an array substrate; a light-emitting layer located at a side of the array substrate and including a plurality of light-emitting units; a touch dielectric layer located at a side of the light-emitting layer facing away from the array substrate and including a plurality of first apertures; a black matrix located within each of the plurality of first apertures; and a color filter layer located at a side of the touch dielectric layer facing away from the array substrate and including a plurality of color filter units. An orthographic projection of each of the plurality of first apertures on the light-emitting layer is located between two adjacent light-emitting units of the plurality of light-emitting units. The plurality of color filter units is in one-to-one correspondence to the plurality of light-emitting units.