Capacitive Touch Panel Sensing Circuit Channel Reduction
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Solution Overview
Problem
As touch panels increase in size, the number of required IC channels grows, significantly increasing material and production costs.
Innovation Solution
The design incorporates first, second, and third lead wires arranged on a glass substrate, where second and third lead wires are parallel and intersect with first lead wires, allowing signal input channels to be coupled to first lead wires and signal output channels to be divided into second and third lead wire channels, reducing the overall number of output channels needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of IC channels is increased to cover larger touch panel areas, then the sensing coverage is improved, but the material cost and production cost are enormously increased
Solution Approach 1:
The patent divides the lead wires into three distinct groups (first, second, and third lead wires) with different functions. The second and third lead wires are further segmented into multiple output channels, where the second lead wires connect to multiple second lead wire signal output channels, and the third lead wires connect to multiple third lead wire signal output channels. This segmentation allows efficient signal routing with fewer total channels needed compared to a fully connected architecture.
Solution Approach 2:
The first lead wires serve multiple functions by being intersected by both second and third lead wires, allowing a single set of first lead wires to be sensed by multiple output channels. This multi-functionality reduces the total number of independent signal paths required, thereby reducing the number of IC channels needed while maintaining comprehensive coverage.
2Reliability
If the number of IC channels is increased to ensure touch sensing function, then the sensing capability is improved, but the material cost is enormously increased
Solution Approach 1:
The patent segments the signal output channels into two distinct types: second lead wire signal output channels and third lead wire signal output channels. Each type handles signals from specific lead wire groups, creating a structured sensing architecture that ensures comprehensive touch detection while minimizing the total channel count through organized signal routing.
Solution Approach 2:
The patent introduces a dimensional organization to the lead wire connections by creating two separate output channel systems (second and third lead wire channels) that operate in parallel. This dimensional separation allows the system to cover the same sensing space with fewer total channels by distributing the sensing load across multiple organized layers rather than requiring a single large channel array.
3Quantity of substance
If the number of output channels is reduced to save material cost, then the material cost is reduced, but the signal detection capability may be compromised
Solution Approach 1:
The patent segments the detection function across two separate output channel systems (second and third lead wire channels), where each system detects signals from specific lead wire groups. This segmentation ensures that signal detection capability is maintained across the entire touch panel area while using fewer total channels, as each segment handles a specific portion of the sensing task efficiently.
Solution Approach 2:
The first lead wires are designed to be universally sensed by both second and third lead wire output channels, allowing a single first lead wire to contribute to multiple detection channels. This multi-functionality ensures comprehensive signal detection coverage while reducing the total number of independent output channels required, maintaining measurement precision with reduced channel count.
Data Source
AI summary
Disclosed are a sensing circuit and a capacitive touch panel having the sensing circuit. The capacitive touch panel has a glass substrate, first lead wires, second lead wires, third lead wires, signal input channels and signal output channels; amounts of the second, third lead wires are N, and any two of the first, the second and the third lead wires are isolated; each signal input channel is coupled to the first lead wire corresponding thereto; each third lead wire signal output channel of the signal output channels is coupled to the N/2 third lead wires, and an amount of the second lead wire signal output channels is N/2, and each second lead wire signal output channel of the signal output channels is coupled to two second lead wires. The amount of the IC channels is decreased to save the touch panel material cost with the present invention.