Display Device Noise Immunity via Insulating Material
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Solution Overview
Problem
Liquid crystal display devices with touch sensor functions face challenges in noise immunity, particularly with regards to external electromagnetic noise, which can cause erroneous touch operations and permanent malfunctions due to static electricity.
Innovation Solution
A display device configuration that includes a touch panel with first and second electrodes, an insulating material positioned in the peripheral area overlapping the opposed portion, and a conductive layer at ground potential, which helps absorb noise currents and prevent electrical breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the touch panel structure is simplified without additional noise protection layers, then manufacturing cost and device complexity are reduced, but noise immunity deteriorates leading to erroneous touch operations and permanent malfunctions from static electricity
Solution Approach 1:
An insulating material is introduced as an intermediary layer between the touch panel and display panel, specifically positioned to cover the opposed portion where first and second electrodes face each other. This insulating material acts as a mediator that blocks noise current paths from reaching the electrodes, preventing erroneous touch operations and permanent malfunctions while maintaining the existing touch panel structure without adding complex protective layers
Solution Approach 2:
The insulating material is selectively applied only in the region overlapping the opposed portion of the electrodes, rather than covering the entire touch panel area. This localized approach provides noise protection precisely where the electrodes are most vulnerable to static electricity interference, while avoiding unnecessary material usage and device complexity in other regions
2Object-affected harmful factors
If external electromagnetic noise protection is enhanced through additional protective layers, then noise immunity is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The insulating material serves multiple functions simultaneously: it provides noise protection by blocking electromagnetic interference from reaching the electrodes, acts as an insulating barrier to prevent electrical breakdown, and can be integrated into the existing display device structure without requiring separate protective layers. This multi-functional approach enhances noise immunity while avoiding additional device complexity
Solution Approach 2:
The insulating material is formed as a composite structure that can be integrated with the existing touch panel and display panel layers. By using materials with appropriate insulating properties and integrating them into the existing layered structure, the patent achieves effective noise protection without requiring entirely new protective layer systems, thereby reducing manufacturing difficulty
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
The solution effectively reduces noise current paths and prevents electrical breakdown, enhancing noise immunity and the reliability of touch operations in display devices.
Implementation Method 1
an insulating material is located in a region overlapping the opposed portion or on a peripheral area side with respect to the opposed portion and contacts the touch panel and the display panel
Implementation Method 2
a conductive layer at ground potential, which helps absorb noise currents and prevent electrical breakdown
Data Source
AI summary
A display device is provided and includes touch panel including first substrate, detection electrodes located in a detection area on first substrate, and outer peripheral lines provided in peripheral area on first substrate and electrically connected to detection electrodes; display panel overlapping touch panel in plan view; insulating layer covering detection electrodes and having surface facing display panel; protection film overlapping outer peripheral lines and provided on surface of insulating layer; polarizer disposed between insulating layer and display panel; and insulating material contacting surface of insulating layer between protection film and polarizer, side surface of protection film and side surface of polarizer, and not directly contacting detection electrodes.