Touch Panel Special-Shaped Regions for FPC Welding
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Solution Overview
Problem
Existing touch panels integrating touch and display functions face challenges with thickness in out-cell structures and high production costs and complexity in ONCELL and INCELL structures.
Innovation Solution
A touch panel design incorporating a liquid crystal display body with special-shaped regions at the lower edges, allowing for pressure welding of driving electrodes with a flexible printed circuit without obstruction, and arranging terminals to reduce scratching risks, enabling efficient electrical connection and integration of touch and display functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lower display screen glass covers the inner surface of the upper display screen glass, then the structure is compact, but the Tx terminals cannot be pressure welded with the FPC
Solution Approach 1:
The patent extracts the lower display screen glass from covering the pressure welding area by creating special-shaped cuttings. This removes the obstruction caused by the glass, allowing the Tx terminals to be accessible for pressure welding with the FPC while maintaining the overall compact structure.
Solution Approach 2:
The lower display screen glass is segmented by creating special-shaped cuttings at the lower edge. This segmentation allows specific regions to be removed (where welding is needed) while retaining the glass coverage in other areas, thus balancing protection and accessibility requirements.
2Ease of operation
If the Tx terminals are arranged on the outer side of the upper display screen glass, then the connection to FPC is easier, but the terminals are more prone to scratching
Solution Approach 1:
Instead of placing the Tx terminals on the outer side of the glass (which would be easier to connect but more exposed to damage), the patent inverts the arrangement by placing them on the inner side. This protects the terminals from scratching while the special-shaped cuttings provide access for connection.
3Adaptability or versatility
If separate structures are used for touch and display functions, then each function can be optimized independently, but the overall device complexity and production cost increase
Solution Approach 1:
The patent merges the touch and display functions into a single integrated panel structure. The sensing electrodes are formed on the same substrate as the display elements, and the special-shaped cuttings serve both structural and functional purposes by enabling welding access while maintaining display integrity. This integration reduces overall complexity compared to separate touch and display assemblies.
Data Source
AI summary
A touch panel includes a liquid crystal display body and a flexible printed circuit (FPC) electrically connected with the liquid crystal display body. The liquid crystal display body includes: sensing electrodes Rx, upper display screen glass, driving electrodes Tx, a color filter with a black frame, liquid crystals, a thin-film transistor drive array and lower display screen glass, where the liquid crystals are filled between the color filter with the black frame and the thin-film transistor drive array; and the liquid crystal display body comprises special-shaped regions at a lower edge of two sides of the liquid crystal display body.