Touch Screen Panel Router Arrangement for RC Delay Reduction
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Solution Overview
Problem
As the resolution of touch panels increases, the number of routers increases, leading to decreased intervals between router lines, increased parasitic capacitance, and longer touch response times due to resistive-capacitive (RC) delay.
Innovation Solution
A touch screen panel design with a reduced number of routers, where driving lines and sensing lines are arranged in a zigzag pattern, with even and odd-numbered units connected to separate routers, reducing the total number of sensing routers connected to driving lines and minimizing parasitic capacitance and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of routers is increased to support higher resolution touch panels, then the touch panel can accommodate more touch units, but the interval between router lines decreases and parasitic capacitance increases
Solution Approach 1:
Multiple touch units (specifically even-numbered and odd-numbered units) are connected to a single shared router. This merging approach reduces the total number of routers required in the system, thereby maintaining larger intervals between router lines and reducing parasitic capacitance while still supporting high-resolution touch detection across multiple units.
Solution Approach 2:
Each router is designed to serve multiple functions by connecting to and controlling multiple touch units simultaneously. This multi-functionality allows the router infrastructure to support higher resolution displays without proportionally increasing the number of routers, thus avoiding the parasitic capacitance issues that would arise from densely packed individual router connections.
2Measurement precision
If the number of routers is increased to support higher resolution touch panels, then more touch units can be addressed, but RC delay increases and touch response time decreases
Solution Approach 1:
By merging multiple touch unit connections into shared routers, the overall router count is reduced. This reduction decreases the total RC delay in the system because there are fewer router components contributing to the cumulative resistive-capacitive time constant, thereby improving touch response time while maintaining the ability to address high-resolution touch units.
3Measurement precision
If the interval between router lines is decreased to support more routers, then higher resolution is achieved, but parasitic capacitance increases
Solution Approach 1:
The patent merges connections from multiple touch units to share common routers, which allows the system to achieve high resolution without physically decreasing the interval between router lines. By consolidating connection paths, the physical spacing between routers can be maintained at larger intervals, thus reducing parasitic capacitance while still supporting a large number of touch units through logical multiplexing.
Data Source
AI summary
A touch screen panel includes a first touch electrode part, a second touch electrode part, a first touch router, a second touch router and plural third touch routers. The first touch electrode part includes plural first touch units. The second touch electrode part is substantially parallel to the first touch electrode part. The second touch electrode part includes plural second touch units. The first touch router is disposed adjacent to the first touch electrode part and is connected to one of an even-numbered first touch unit and an odd-numbered first touch unit of the first touch units. The second touch router is disposed adjacent to the first touch electrode part and is connected to the other of the even-numbered first touch unit and the odd-numbered first touch unit of the first touch units. The third touch routers are connected to each of the second touch units, respectively.