Integrated Touch Screen Assembly with Liquid Crystal Layers
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Solution Overview
Problem
Conventional touch screens require high precision and time-consuming assembly processes, resulting in increased thickness and production costs due to the separate manufacturing and assembly of touch panels and liquid crystal panels.
Innovation Solution
A touch screen design where the upper and lower transparent conductive layers, polarizing plates, and circuit layers are integrated directly on and under a liquid crystal layer, eliminating the need for a separate touch panel and reducing material thickness, with optional shielding and dielectric layers for noise rejection and light blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch panel and liquid crystal panel are manufactured separately and then assembled, then the touch control functionality is achieved, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The patent merges the touch panel and liquid crystal panel into a single integrated structure. The touch-sensitive circuit layers are formed directly on the liquid crystal display substrate, eliminating the need for separate assembly of touch panel and LCD panel. This integration maintains touch control functionality while significantly simplifying the manufacturing process and reducing assembly complexity.
2Reliability
If the touch panel and liquid crystal panel are manufactured separately and then assembled, then the touch control functionality is achieved, but the production time increases
Solution Approach 1:
The touch panel and liquid crystal panel are combined into a single manufacturing process. The circuit layers are formed directly on the liquid crystal display substrate through sequential deposition steps, eliminating the need for separate assembly operations. This integration reduces production time while ensuring functional reliability.
3Reliability
If multiple separate layers and panels are used, then the touch control functionality is achieved, but the thickness of the touch screen increases
Solution Approach 1:
The patent integrates the touch panel and liquid crystal panel into a single thin structure. By forming the touch-sensitive circuit layers directly on the LCD substrate and using thin-film deposition techniques, the overall thickness is reduced compared to conventional separate-panel designs, while maintaining full touch control functionality.
4Reliability
If conventional separate manufacturing and assembly is used, then the touch control functionality is achieved, but the production cost increases
Solution Approach 1:
The integrated manufacturing process combines touch panel and liquid crystal panel fabrication into a single production line. The circuit layers are formed using standard thin-film deposition techniques that can be performed in existing LCD manufacturing equipment, eliminating the need for separate touch panel assembly facilities and reducing overall production costs while maintaining touch control functionality.
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
Simplifies the assembly process, reduces thickness, and lowers production costs while maintaining touch control functionality, and enhances electromagnetic interference protection.
Implementation Method 1
The transparent over coat 55 is dielectric, which is connected to the adhesive layer 6. The transparent over coat 55 is used for preventing the second circuit layer 53 from being damaged/scratched.
Implementation Method 2
The liquid crystal panel 1c includes a liquid crystal layer 15c, an upper glass plate 11c, an upper transparent conductive layer 12c, a lower glass plate 13c, a lower transparent conductive layer 14c, an upper polarizing plate 16c and a lower polarizing plate 17c.
Implementation Method 3
The first circuit layer 52 and the second circuit layer 53 can be made of indium-tin oxide (ITO). The upper transparent conductive layer 12c, the upper glass plate 11c and the upper polarizing plate 16c are deposed on the liquid crystal layer 15c
Implementation Method 4
The liquid crystal panel 1c includes a liquid crystal layer 15c, an upper glass plate 11c, an upper transparent conductive layer 12c, a lower glass plate 13c, a lower transparent conductive layer 14c, an upper polarizing plate 16c and a lower polarizing plate 17c.
Data Source
AI summary
A touch screen includes a liquid crystal layer, an upper transparent conductive layer, a lower transparent conductive layer, an upper transparent plate, a lower transparent plate, an upper polarizing plate, a lower polarizing plate and a circuit unit. The upper transparent conductive layer, the upper transparent plate, the circuit unit and the upper polarizing plate are disposed on the liquid crystal layer in the above-mentioned order from one side of the liquid crystal layer. The lower transparent conductive layer, the lower transparent plate and the lower polarizing plate are disposed under the liquid crystal layer in the above-mentioned order from another side of the liquid crystal layer.