Conductive Layer Noise Filtering for Touch Panel Lead Lines
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Solution Overview
Problem
Liquid crystal display devices with touch sensor functions face issues with noise immunity, leading to erroneous touch operations due to external electromagnetic noise, and existing shielding methods are costly and inefficient.
Innovation Solution
A display device design that includes a conductive layer overlapping lead lines connecting touch panel electrodes to a controller, which acts as a noise filter by creating a coupling capacitance and redirecting noise currents to ground, reducing noise interference and simplifying the structure while lowering production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full shielding methods are used to protect detection electrodes from noise waves, then noise immunity is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent applies shielding selectively only to the peripheral area where lead lines are located, rather than shielding the entire touch panel. This local shielding approach protects the noise-sensitive lead lines while avoiding the cost and complexity of full-panel shielding, directly resolving the contradiction between noise immunity and device complexity
Solution Approach 2:
The patent introduces a conductive layer as an intermediary shielding structure positioned between the noise source and the lead lines. This conductive layer acts as a noise barrier specifically for the peripheral region, providing effective noise protection without requiring complete enclosure or full-panel shielding
2Reliability
If full shielding methods are used to protect detection electrodes from noise waves, then noise immunity is improved, but manufacturing cost increases
Solution Approach 1:
The shielding is implemented only in the peripheral area where lead lines are present, rather than across the entire display device. This localized approach reduces material consumption and manufacturing steps, directly lowering production costs while maintaining adequate noise immunity for the critical regions
Solution Approach 2:
The patent employs a simple conductive layer as the shielding structure, which can be implemented using cost-effective conductive materials and straightforward fabrication processes. This replaces expensive complex shielding structures with a more economical solution that achieves the same protective function
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
Effectively suppresses noise-induced malfunctions and improves display quality by reducing noise contamination on video signals, while also simplifying the structure and reducing production costs compared to full shielding methods.
Implementation Method 1
acts as a noise filter by creating a coupling capacitance and redirecting noise currents to ground
Implementation Method 2
The conductive layer provided in a region overlapping lead lines functions as a noise filter
Data Source
AI summary
According to one embodiment, a display device includes a display panel which displays an image, a touch panel provided on the display panel and including a sensor area in which a plurality of electrodes for detecting touch operation are provided and a peripheral area provided around the sensor area, a controller which controls the plurality of electrodes, lead lines provided in the peripheral area to connect the electrodes provided in the sensor area to the controller and a conductive layer provided in a region which overlaps at least part of the lead lines.