Active One-Layer Multi-Touch Sensor Panel Noise Isolation
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Solution Overview
Problem
One-layer multi-touch sensor panels are prone to noise interference, leading to reduced signal-to-noise ratio (SNR) and decreased accuracy in touch detection, and require a larger flexible printed circuit board (FPC) area, increasing costs.
Innovation Solution
An active one-layer multi-touch sensor panel device with a die of touch controller IC bonded to the panel using a chip-on-glass (COG) method, featuring switch sets connected to conductive lines to isolate noise interference by activating only one switch set at a time, and a flexible PCB with reduced traces to minimize noise impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sensing conductive lines are short-circuited to form lines on the FPC to enable one-layer multi-touch sensor panel, then manufacturing cost is reduced, but noise interference increases and signal-to-noise ratio decreases
Solution Approach 1:
The patent divides the sensor panel into multiple sensing blocks, each with its own dedicated sensing conductive lines that are not short-circuited together. This segmentation isolates the sensing signals from noise sources, improving the signal-to-noise ratio while maintaining the one-layer structure for cost effectiveness.
Solution Approach 2:
The patent introduces switch sets as intermediary components between the driving conductive lines and sensing conductive lines. These switches act as mediators that selectively connect driving lines to sensing lines only when needed for touch detection, preventing continuous noise coupling while enabling the simplified one-layer design.
2Ease of manufacture
If sensing conductive lines are short-circuited to form lines on the FPC to enable one-layer multi-touch sensor panel, then manufacturing cost is reduced, but FPC area increases
Solution Approach 1:
By segmenting the sensor into independent sensing blocks with dedicated conductive lines, the patent eliminates the need for extensive short-circuit connections on the FPC. This reduces the FPC trace area while maintaining the cost benefits of the one-layer panel structure.
Solution Approach 2:
The patent utilizes the temporal dimension through sequential scanning of sensing blocks, allowing multiple sensing lines to be multiplexed over time. This eliminates the need for parallel physical connections on the FPC, reducing the required FPC area while maintaining full sensing functionality.
3Ease of manufacture
If one-layer multi-touch sensor panel is used to reduce cost, then manufacturing cost decreases, but noise interference between sensing blocks increases
Solution Approach 1:
The patent segments the sensor panel into isolated sensing blocks, each with dedicated conductive lines that do not intersect or short-circuit with other blocks. This physical segmentation prevents noise propagation between blocks while maintaining the cost-effective one-layer design.
Solution Approach 2:
The switch sets serve as intermediary components that selectively activate specific sensing blocks only when touch detection is required. This temporal isolation prevents continuous noise coupling between blocks, reducing noise interference while maintaining the simplified one-layer structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances touch detection accuracy by mitigating noise interference and reduces the FPC area, thereby lowering manufacturing costs.
Implementation Method 1
a capacitive touch panel uses a capacitance change generated in an electrostatic combination of the arranged transparent electrodes and a human body to generate a current or voltage for detecting the touching coordinates
Implementation Method 2
the die of touch controller IC has a plurality of switch sets connected to the plurality of conductive lines, such that only one of the switch sets is activated in a specific time interval to perform a touch sensing on a part of the conductive lines connected to the switch set activated
Data Source
AI summary
An active one-layer multi-touch sensor panel device includes a one-layer multi-touch sensor panel, a die of touch controller IC, and a flexible printed circuit board. The one-layer multi-touch sensor panel has a plurality of conductive lines for forming a plurality of touch sensing areas thereon. The die of touch controller IC is bonded onto the one-layer multi-touch sensor panel by a chip-on-glass method. The die of touch controller IC is connected to the plurality of conductive lines to drive the plurality of conductive lines and receive sensing signals associated with the plurality of conductive lines for detecting touch positions on the one-layer multi-touch sensor panel. The flexible printed circuit board is electrically connected to the die of touch controller IC by the one-layer multi-touch sensor panel to transmit the sensing signals received.