Integrated Touch Screen Substrate Structure for Reduced Thickness
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Solution Overview
Problem
Conventional touch screens have a large thickness and low light-transmittance due to their four-layer structure, which can be improved by integrating the color filter substrate with the lower substrate to achieve a three-layer structure.
Innovation Solution
A touch screen is designed with a first substrate, a second substrate, and a third substrate sequentially stacked, where the second substrate with a first sensing layer and the third substrate with a second sensing layer form a touch unit, and the second substrate and the first substrate constitute a display unit, allowing for a capacitive or resistance type touch screen with reduced thickness and increased light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a four-layer structure (array substrate, color filter substrate, lower substrate, upper substrate) is used, then the touch screen can be assembled with separate display and touch units, but the thickness becomes large and light-transmittance decreases
Solution Approach 1:
The color filter substrate and lower substrate are integrated into a single component, reducing the four-layer structure to a three-layer structure. This merging eliminates the need for separate assembly of these two substrates, thereby reducing overall thickness while maintaining the functional separation between display and touch units through the polarizer sheet replacement approach
2Ease of manufacture
If a four-layer structure (array substrate, color filter substrate, lower substrate, upper substrate) is used, then the touch screen can be assembled with separate display and touch units, but the light-transmittance becomes low
Solution Approach 1:
By integrating the color filter substrate with the lower substrate, the number of optical interfaces and bonding layers is reduced, minimizing light loss at interfaces and improving overall light-transmittance
Solution Approach 2:
The patent replaces cover lenses with polarizer sheets, which are thin film components that provide the necessary optical function with minimal thickness and high light-transmittance, further contributing to the overall improvement in light transmission through the touch screen structure
3Length of stationary object
If the thickness of substrates in the display unit and/or touch unit is decreased, then the overall thickness is reduced, but the structural strength and reliability may be compromised
Solution Approach 1:
The integration of color filter substrate and lower substrate creates a more robust single component that maintains structural integrity while reducing overall thickness, as the merged structure eliminates potential weak points at bonding interfaces
Solution Approach 2:
The patent employs composite material structures in the integrated substrate design, combining materials with complementary properties to achieve both thinness and structural strength, ensuring reliability is maintained despite reduced thickness
Data Source
AI summary
A touch screen comprises a first substrate, a second substrate and a third substrate sequentially stacked. A first sensing layer is provided on a first surface of the second substrate opposing to the third substrate, and a second sensing layer is provided on a surface of the third substrate opposing to the second substrate. The second substrate provided with the first sensing layer and the third substrate provided with the second sensing layer constitute a touch unit for sensing a touch signal, and the second substrate and the first substrate constitute a display unit for displaying.