Display Device Black Matrix Touch Electrode Resistance
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Solution Overview
Problem
Existing display devices with integrated touch screens face issues of increased thickness due to adhesive layers, which also lead to a greater distance between the organic light emitting device layer and the color filter layer, resulting in reduced luminance and color viewing angles, and external light reflection, affecting image visibility and contrast.
Innovation Solution
A display device design that minimizes the distance between the organic light emitting layer and the black matrix by eliminating the adhesive layer between the substrates, and uses a three or more-layered metal layer in the black matrix to prevent color mixture and reduce touch electrode resistance, thereby enhancing contrast and visibility without a polarizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an adhesive layer is used to bond substrates, then the structural integrity and ease of manufacture are improved, but the device thickness increases and the distance between the organic light emitting layer and color filter layer increases
Solution Approach 1:
The adhesive layer is completely removed from the display device structure. The first substrate and second substrate are bonded directly through direct contact without any adhesive layer, thereby eliminating the thickness contribution of the adhesive layer and reducing the overall device thickness while maintaining structural integrity
Solution Approach 2:
The bonding function previously performed by the adhesive layer is merged into the direct contact interface between the first substrate and second substrate. The substrates themselves serve as the bonding medium, eliminating the need for a separate adhesive layer and reducing the number of components in the device structure
2Strength
If an adhesive layer is used to bond substrates, then the structural integrity is improved, but the distance between the organic light emitting layer and color filter layer increases, reducing luminance and color viewing angles
Solution Approach 1:
The adhesive layer is removed to eliminate the spacing it creates between the organic light emitting layer and color filter layer. This direct contact configuration reduces the distance to approximately zero, maximizing light extraction efficiency and color viewing angles while the substrates themselves provide the necessary structural support
Solution Approach 2:
The first substrate and second substrate are designed as composite structures with sufficient mechanical strength to maintain structural integrity without requiring an adhesive layer. The substrates themselves are engineered to provide both structural support and optical functionality, eliminating the need for additional bonding materials that would increase spacing
3Ease of manufacture
If a single-layer black matrix is used, then the manufacturing process is simpler, but color mixture occurs and touch electrode resistance is higher
Solution Approach 1:
The black matrix is divided into multiple layers with different functions: a first black matrix layer for light blocking and a second black matrix layer for providing a low-resistance path for touch electrodes. This segmentation allows each layer to be optimized for its specific function, preventing color mixture and reducing touch electrode resistance while maintaining manufacturing feasibility
Solution Approach 2:
The second black matrix layer serves multiple functions: it acts as an additional light blocking barrier to prevent color mixture, provides a low-resistance path for touch electrode signals, and contributes to the overall structural integrity of the display device. This multi-functionality addresses multiple problems simultaneously without significantly increasing manufacturing complexity
4Ease of manufacture
If the distance between the organic light emitting layer and black matrix is large, then the manufacturing process is easier, but external light reflection occurs and contrast ratio is reduced
Solution Approach 1:
The adhesive layer that creates spacing between the organic light emitting layer and black matrix is removed. This direct contact configuration eliminates the air gap that causes external light reflection, thereby improving contrast ratio and image quality while the substrates maintain the necessary structural integrity
Solution Approach 2:
The substrates are designed as optically optimized composite materials with appropriate refractive indices and surface properties that minimize external light reflection when in direct contact with the black matrix. This composite material design enables the direct contact configuration to achieve high contrast ratio while maintaining manufacturing ease
Data Source
AI summary
Disclosed is a display device with integrated touch screen, in which a resistance of a touch electrode is reduced by using a black matrix. The display device includes an organic light emitting device layer disposed on a substrate, a plurality of color filters disposed on the organic light emitting device layer, a black matrix disposed to overlap a boundary portion between the plurality of color filters and including a three or more-layered metal layer, and a plurality of first touch electrodes and a plurality of second touch electrodes disposed on the black matrix.