Orthogonal Flexible Substrates for Touch Panel Signal Isolation
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Solution Overview
Problem
In display devices with electrostatic capacitive touch panels, signal interference occurs due to overlapping flexible substrates, leading to inaccurate detection of contact, as noise from the display panel's signal is superimposed on the touch panel's signal.
Innovation Solution
The design includes a display panel and an electrostatic capacitive touch panel with non-overlapping flexible substrates that intersect and couple with the circuit substrate at different angles, reducing signal interference by making the flexible substrates orthogonal to each other and preventing overlap, thereby enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the flexible substrate for the display panel and the flexible substrate for the touch panel are made to overlap each other to simplify the device structure, then the device complexity is reduced, but signal interference occurs and the detection precision of the touch panel deteriorates
Solution Approach 1:
The patent resolves the signal interference problem by changing the spatial arrangement from a stacked configuration (overlapping in the vertical dimension) to a planar non-overlapping configuration. The flexible substrates are routed to intersect at the circuit substrate while remaining separate in the planar view, eliminating the vertical overlap that causes electromagnetic interference and ensuring accurate touch detection.
2Measurement precision
If the flexible substrates are routed to intersect and couple with the circuit substrate to reduce signal interference, then the detection precision is improved, but the device complexity increases due to more complex routing
Solution Approach 1:
The patent merges the routing paths of both flexible substrates at the circuit substrate, where they intersect and couple together. This merging point serves as a common connection location for both the display panel and touch panel signals, simplifying the overall connection architecture while maintaining the non-overlapping arrangement that prevents signal interference.
Data Source
AI summary
Provided is a display device with an electrostatic capacitive touch panel including a display panel having a first side that extends in a first direction and a second side that extends in a second direction intersecting the first direction, an electrostatic capacitive touch panel having a third side that extends in the first direction and a fourth side that extends in the second direction, a circuit substrate having a fifth side that extends in the first direction and a sixth side that extends in the second direction, a first flexible substrate that is pulled out from the first side of the display panel, intersects the fifth side, and is coupled to the circuit substrate, and a second flexible substrate that is pulled out from the fourth side of the electrostatic capacitive touch panel, intersects the sixth side, and is coupled to the circuit substrate.