Touch Display Device Signal Interference Reduction
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Solution Overview
Problem
The existing touch display devices face issues with signal interference due to the integration of touch and display signal lines on multi-layer flexible circuit boards, leading to increased thickness, cost, and difficulties in bending, as well as signal attenuation and new interference problems.
Innovation Solution
A touch display device is designed with a touch display substrate and a flexible circuit board, where the touch chip, touch signal line, and touch bonding region are positioned on the same side as the display signal line, preventing intersection and thus eliminating signal interference. The flexible circuit board is configured as a two-layer board, with the display signal line on one layer and the touch signal line on the other, further minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layer flexible circuit board is used to avoid signal interference, then signal interference is reduced, but the thickness, cost, and bendability deteriorate
Solution Approach 1:
The patent transitions from a multi-layer board structure to a single-layer board structure by arranging touch and display signal lines on opposite sides of the flexible circuit board in different spatial dimensions, eliminating the need for multiple layers while preventing signal interference
Solution Approach 2:
The patent segments the signal lines into separate groups (touch signal lines and display signal lines) and positions them on opposite sides of the flexible circuit board, creating physical separation that prevents interference while simplifying the overall structure
2Reliability
If a multi-layer flexible circuit board is used to avoid signal interference, then signal interference is reduced, but the cost increases
Solution Approach 1:
The patent merges the touch and display signal line routing into a single-layer flexible circuit board structure, combining what would have been separate multi-layer structures into one unified design that is easier and cheaper to manufacture
3Reliability
If a multi-layer flexible circuit board is used to avoid signal interference, then signal interference is reduced, but the bendability deteriorates
Solution Approach 1:
The patent uses spatial arrangement on opposite sides of the board (dimensional separation) to prevent signal interference, which allows the board to remain thin and flexible while maintaining signal isolation without requiring multiple layers that would reduce bendability
4Device complexity
If touch and display signal lines are arranged on the same side of the flexible circuit board, then the structure is simplified, but signal interference occurs
Solution Approach 1:
The patent positions touch and display signal lines on opposite sides of the flexible circuit board, using the third dimension (depth/thickness) to separate signal paths and prevent interference while maintaining a simple single-layer structure
Data Source
AI summary
A touch display device, including: a touch display substrate, provided with a display region and a non-display region provided adjacent to the display region, wherein the non-display region is provided with a display bonding region and a touch bonding region; and a flexible circuit board, provided with a touch signal line, a touch chip and a display signal line, wherein the touch signal line is connected with the touch chip, the flexible circuit board is bound with the touch display substrate in the display bonding region and the touch bonding region, the touch chip is connected to the touch bonding region through the touch signal line, and the display signal line is connected to the display bonding region; where the touch chip, the touch signal line and the touch bonding region are provided on a same side of the display signal line.