Array Substrate Peripheral Roughness Reduces Color Separation
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Solution Overview
Problem
The color separation phenomenon in display panels occurs when external light is irradiated on an off-screen state, causing reflected light to be separated by sub-pixels with fixed reflection directions, affecting the user's experience of an absolutely black screen.
Innovation Solution
An array substrate design featuring a base substrate with opening regions and peripheral regions, where the first electrode layer's surface roughness in peripheral regions is greater than in other regions, and color filter parts are arranged in one-to-one correspondence with opening regions to filter incident light, allowing for diffuse reflection and mixing of light from adjacent sub-pixels to form white light, reducing color separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a color filter part is integrated on an encapsulation layer to replace the circular polarizer, then the thickness of the module is greatly reduced, but color separation of reflected light occurs when external light is irradiated on the display panel in off-screen state
Solution Approach 1:
The patent applies local quality by creating peripheral regions with different surface roughness characteristics around opening regions. The first electrode layer has increased roughness specifically in the peripheral regions surrounding each opening region, while maintaining smoother surfaces in other areas. This localized modification of surface properties enables selective light scattering at boundaries without affecting the overall thin structure of the display panel.
Solution Approach 2:
The patent introduces an intermediary structure - the pixel defining layer with controlled roughness - that mediates between the color filter parts and the first electrode layer. This intermediate layer with specific roughness characteristics in peripheral regions acts as a light scattering interface that prevents direct reflection paths while maintaining the integrated color filter structure, thereby eliminating color separation without adding significant thickness.
2Device complexity
If sub-pixels have fixed reflection directions for light irradiated thereon, then the structure is simple, but the light reflected back is in a separated state causing color separation phenomenon
Solution Approach 1:
The patent modifies only specific local areas (peripheral regions) of the first electrode layer to have increased roughness, while keeping other regions relatively smooth. This localized structural modification changes light reflection characteristics at boundaries without fundamentally altering the overall sub-pixel structure, thus preventing color separation while maintaining structural simplicity.
Solution Approach 2:
The patent addresses the two-dimensional reflection direction issue by introducing surface roughness variation as a third dimension of control. Instead of changing the planar geometry of sub-pixels, the invention uses vertical surface topology (roughness) to scatter light in multiple directions, thereby eliminating color separation without complicating the fundamental sub-pixel structure.
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 design effectively reduces color separation by changing the reflection directions of light, allowing for better mixing of light from adjacent sub-pixels, thereby enhancing the user's experience of an absolutely black screen.
Implementation Method 1
the color filter parts are configured to filter incident light from outside to the color filter parts
Implementation Method 2
a roughness of a surface, facing away from the base substrate, of the first electrode layer in the peripheral regions is greater than a roughness of a surface, facing away from the base substrate, of the first electrode layer in the other regions
Data Source
AI summary
The present disclosure provides an array substrate and a manufacturing method thereof, a display panel and a display device. The array substrate includes a base substrate; a pixel defining layer disposed on the base substrate, the pixel defining layer is provided with a plurality of opening areas, peripheral areas surrounding the opening areas and other areas except the opening areas and the peripheral areas; and a first electrode layer, disposed on the side of the pixel defining layer facing away from the base substrate. A roughness of a surface, facing away from the base substrate, of the first electrode layer in the peripheral regions is greater than a roughness of a surface, facing away from the base substrate, of the first electrode layer in the other regions.