OLED Display Panel Light-Shielding Layer Anti-Reflection
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Solution Overview
Problem
OLED display panels face challenges in maintaining high light-emitting efficiency while reducing manufacturing costs and improving anti-reflective performance, especially in off-screen states due to the replacement of polarizers with black matrices and color filters, which compromises anti-reflective functions.
Innovation Solution
A display panel design incorporating a substrate with a first electrode layer, a pixel definition layer featuring a light-shielding function, and a light-emitting layer, where the pixel definition layer includes a light-shielding function layer that covers the edge parts of the electrode units, effectively absorbing reflected ambient light to enhance anti-reflective performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the polarizer is replaced with a black matrix and color filter to reduce manufacturing costs and improve thinness, then manufacturing cost and thickness are improved, but anti-reflective performance deteriorates
Solution Approach 1:
The pixel definition layer is segmented into multiple functional sub-layers: a first pixel definition layer for basic patterning, a light-shielding function layer for anti-reflective performance, and a second pixel definition layer for additional patterning. This segmentation allows each layer to perform its specific function optimally while working together to resolve the contradiction between manufacturing cost and anti-reflective performance.
Solution Approach 2:
The pixel definition layer uses composite material structure combining transparent materials in the first and second pixel definition layers with light-shielding materials in the light-shielding function layer. This composite approach enables the layer to simultaneously provide light transmission for display functionality and light shielding for anti-reflective performance, while maintaining manufacturing efficiency.
2Use of energy by moving object
If the transmittance of the color filter is increased to maintain light-emitting efficiency, then light-emitting efficiency is improved, but anti-reflective performance deteriorates
Solution Approach 1:
The solution moves from relying solely on the color filter layer for anti-reflective performance to adding a vertical dimension of light shielding through the light-shielding function layer within the pixel definition layer. This dimensional addition allows the color filter to maintain high transmittance for light-emitting efficiency while the light-shielding function layer provides the necessary anti-reflective performance by blocking ambient light from reaching the edge parts of electrode units.
3Object-affected harmful factors
If the light-shielding function layer is positioned closer to the light-emitting layer to maximize light blocking, then anti-reflective performance is improved, but light-emitting efficiency deteriorates
Solution Approach 1:
The light-shielding function layer is designed with local quality by positioning it to specifically cover the edge parts of electrode units where reflections occur, rather than uniformly blocking all light. The layer uses light-shielding materials in areas where reflection prevention is needed while maintaining transparency in areas where light emission must pass through, thereby achieving both anti-reflective performance and light-emitting efficiency.
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 improves anti-reflective performance and reduces reflection issues in off-screen states by using a light-shielding function layer within the pixel definition layer to absorb external ambient light, while maintaining light-emitting efficiency and stability, and expanding material selection options for cost reduction.
Implementation Method 1
the pixel definition layer includes a light-shielding function layer, an orthographic projection of the light-shielding function layer on each of the first electrode units covers at least a portion of the edge part... effectively absorbing reflected ambient light
Data Source
AI summary
A display panel and a display device are provided, including: a substrate; multiple first electrode units; a pixel definition layer defining multiple pixel definition openings corresponding to the first electrode units; and a light-emitting layer covering the first electrode units; where each of the first electrode units includes an edge part protruded from an edge of one of the pixel definition openings corresponding to the first electrode units, the pixel definition layer includes a light-shielding function layer, an orthographic projection of the light-shielding function layer on each of the first electrode unit covers at least a portion of the edge part corresponding to the first electrode unit, and the light-shielding function layer and the light-emitting layer are arranged at intervals.