Touch Display FPC Layout With Circuit Board Cutout for Crimping
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Solution Overview
Problem
In large high-resolution touch panel display devices, the placement of flexible printed circuit boards (FPCs) on the same side of the display device can lead to enlarged connection areas and poor connections due to interference from touch panel FPCs, which can inhibit the connection between LCD-FPCs and circuit boards, and may result in damaged wiring during crimping.
Innovation Solution
The design includes a third substrate with cutouts or recesses to accommodate the second flexible printed circuit board, allowing it to extend over the circuit board without interfering with the crimping tool, ensuring sufficient pressure and heat application for reliable connections between FPCs and the circuit board, preventing damage and improving manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the LCD-FPC and TP-FPC are placed on the same side of the display device, then the connection area is reduced and manufacturing is simplified, but the TP-FPC may inhibit connection between the LCD-FPC and the circuit board, and the crimping tool may damage the TP-FPC wiring
Solution Approach 1:
The patent extracts the TP-FPC from the crimping area by creating a cutout in the circuit board at the position where the TP-FPC extends. This allows the TP-FPC to be separated from the crimping operation, eliminating the harmful interference while maintaining the benefit of having both FPCs on the same side for simplified manufacturing
Solution Approach 2:
The cutout in the circuit board acts as an intermediary structure that mediates between the TP-FPC and the crimping tool. It provides a path for the TP-FPC to extend without interfering with the crimping operation, allowing both components to coexist in the same area without harmful interactions
2Area of stationary object
If the LCD-FPC is segmented into small pieces to reduce connection area, then the connection area is reduced, but the TP-FPC still inhibits connection between the LCD-FPC and circuit board
Solution Approach 1:
The cutout extracts the TP-FPC from the connection area, allowing the LCD-FPC segments to connect to the circuit board without being blocked by the TP-FPC. This maintains connection reliability while keeping the connection area small through segmentation
3Productivity
If the crimping tool is used to connect the LCD-FPC and circuit board, then connection efficiency is improved, but the TP-FPC may be crimped together with the LCD-FPC, resulting in poor connection and potential wiring damage
Solution Approach 1:
The cutout extracts the TP-FPC from the crimping zone, allowing the crimping tool to apply full pressure to the LCD-FPC and circuit board without the TP-FPC interfering. This maintains high connection efficiency while ensuring connection quality is not compromised
Solution Approach 2:
The cutout is designed in advance to prevent the TP-FPC from being crimped together with the LCD-FPC. This preliminary structural arrangement prevents the harmful effect before it can occur during the crimping process, ensuring both productivity and connection quality
Data Source
AI summary
An electrooptic display device includes a TFT substrate, a touch panel superimposed and placed on the TFT substrate, a circuit board spaced apart from the TFT substrate and the touch panel, one side of the circuit board facing the TFT substrate and the touch panel, a plurality of first FPCs each including one end electrically connected to one side of the TFT substrate, and the other end electrically connected to one side of the circuit board, and a second FPC that is electrically connected to the touch panel and extends in parallel to the first FPCs. The circuit board includes a cutout in a portion overlapping the second FPC on one side of the circuit board.