Touch Display Device Flexible PCB Integration
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Solution Overview
Problem
Conventional touch-sensitive LCD devices, particularly the On Cell type, face issues with increased thickness and manufacturing costs due to the use of flexible PCBs, which are prone to defects and require complex assembly processes, leading to higher production costs and lower yield.
Innovation Solution
A touch display device design that integrates touch-sensitive layers on substrates with pins for connection via flexible PCBs, eliminating the need for external touch PCBs and reducing the length and complexity of flexible PCBs, thereby decreasing thickness and manufacturing costs while improving production yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flexible PCB is used to connect sensitive electrode lines to external touch PCB, then touch signal transmission is achieved, but device thickness increases and manufacturing cost increases
Solution Approach 1:
The patent combines the touch signal processing function directly into the display driver PCB, eliminating the need for a separate external touch PCB. The sensitive electrode lines are connected to the display driver PCB through the flexible PCB, merging the touch control and display driving functions into a single integrated structure, thereby reducing overall device thickness while maintaining touch signal transmission capability
Solution Approach 2:
The patent extracts the touch signal processing function from the external touch PCB and integrates it into the display driver PCB. By taking out the separate touch control unit and combining it with the existing display driver, the design reduces the number of external components and connections needed, thus decreasing device thickness and simplifying the overall structure
2Reliability
If flexible PCB is used to connect sensitive electrode lines to external touch PCB, then touch signal transmission is achieved, but manufacturing cost increases
Solution Approach 1:
The patent merges the touch controller and display driver into a single integrated PCB unit. This consolidation eliminates the need for separate external touch PCB and reduces the number of connection interfaces, thereby lowering manufacturing costs through reduced component count and simplified assembly processes while maintaining reliable touch signal transmission
Solution Approach 2:
The display driver PCB is designed to perform multiple functions: both driving the display and processing touch signals. This multi-functional design eliminates the need for a dedicated external touch PCB, reducing overall system complexity and manufacturing costs while ensuring reliable touch signal transmission through the integrated structure
3Ease of operation
If flexible PCB length is increased to bypass lower substrate, then connection between sensitive electrode lines and external touch PCB is achieved, but stress on flexible PCB increases causing it to break off
Solution Approach 1:
By merging the touch control function into the display driver PCB located at the same side as the sensitive electrode lines, the patent significantly shortens the flexible PCB connection path. This eliminates the need for the flexible PCB to bypass the lower substrate over a long distance, reducing bending stress and improving durability while maintaining full connection capability
4Ease of manufacture
If external touch PCB is eliminated and touch signal processing chip is placed on flexible PCB, then manufacturing cost is reduced, but flexible PCB manufacturing complexity increases
Solution Approach 1:
The patent combines the touch signal processing chip with the display driver PCB, creating a single integrated unit. This approach is more manufacturable than placing the chip on the flexible PCB because rigid PCBs are better suited for housing complex electronic components, while still achieving cost reduction by eliminating the external touch PCB and reducing the number of interconnections required
Data Source
AI summary
A touch display device includes a first substrate, a second substrate opposite to the first substrate, a display medium sandwiched between the two substrates, and a touch-sensitive layer including sensitive electrode lines. The first substrate includes a first surface facing the display medium layer and a second surface far away from the display medium layer and opposite to the first surface. The touch-sensitive layer is disposed on the second surface of the first substrate, and first pins are disposed on a side area of the first substrate corresponding to a side of the touch display device to connect the sensitive electrode lines. Second pins are disposed on a side area of the second substrate corresponding to the same side of the touch display device, and connected to the first pins via a first printed circuit board (PCB). The first PCB is a flexible PCB.