Array Substrate Light-Absorbing Layer Reflectivity Reduction
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Solution Overview
Problem
The high reflectivity of display panels, particularly in areas with thin film transistors, reduces image quality due to ambient light reflection, which is exacerbated by the use of metal in these areas, and poses challenges for borderless display designs.
Innovation Solution
An array substrate is designed with a light-absorbing layer and a transparent insulating layer, both with specific thickness and material properties, to reduce reflectivity and enhance adhesion, thereby improving image quality and adapting to full-screen demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If metal layers are used in the TFT area to enable four-sided borderless design, then manufacturing yield and adaptability are improved, but reflectivity increases and image quality deteriorates
Solution Approach 1:
The patent converts the harmful reflective property of metal layers into a beneficial light-absorbing property by introducing a light-absorbing layer made of the same or similar metal material. This layer absorbs ambient light that would otherwise be reflected, thereby maintaining the four-sided borderless design while eliminating the image quality deterioration caused by high reflectivity.
Solution Approach 2:
The light-absorbing layer acts as an intermediary between the metal TFT layers and the external environment. It mediates the interaction by absorbing stray light before it can be reflected by the metal layers, thus protecting the display quality while preserving the electrical functionality of the metal TFT structure.
2Object-affected harmful factors
If a light-absorbing layer is added to reduce reflectivity, then image quality is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The light-absorbing layer is designed to serve multiple functions simultaneously: it absorbs stray light to reduce reflectivity, provides adhesion between different layers, and can be integrated with existing TFT manufacturing processes. This multi-functionality reduces the need for additional specialized layers, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent merges the light-absorbing function with the adhesion function into a single layer. Rather than adding separate layers for each function, the light-absorbing layer is designed to perform both light absorption and provide inter-layer adhesion, thus reducing the overall number of layers and manufacturing steps.
3Object-affected harmful factors
If the light-absorbing layer is made thicker to improve light absorption, then reflectivity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the thickness parameter of the light-absorbing layer to achieve the best balance between light absorption efficiency and manufacturing feasibility. By carefully selecting the thickness within a specific range, the design achieves sufficient light absorption without requiring extremely tight thickness control, thus managing manufacturing precision requirements.
Solution Approach 2:
The light-absorbing layer is made from metal oxide materials that have high light absorption coefficients. By using materials with inherently high absorption properties, the required thickness for effective light absorption is reduced, thereby lowering the manufacturing precision requirements for thickness control.
Data Source
AI summary
The present invention provides an array substrate including a substrate, a transparent insulating layer, a light-absorbing layer, a thin film transistor layer, a first protective layer, and a color filter layer. Since structures of the transparent insulating layer and the light-absorbing layer are added to the array substrate, the problem of high reflectivity of display panels with light emitting from sides of the array substrate can be solved and the image quality of the display panel is improved, so that the display panel can better adapt to a full screen demand of the market.