Display Device Electrostatic Dissipation Protective Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display devices with integrated touch panels face issues with electrostatic charging, leading to malfunction when used with fingers or pens, as charges accumulate on the display cell surface and are transferred to the touch panel.
Innovation Solution
A display device design featuring a touch panel with detection electrodes covered by a protective layer and an optical film, where the protective layer is made of a conductive and insulating material to quickly dissipate electrostatic charges, preventing surface charging and ensuring proper operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a touch panel is integrated inside the display cell, then the device thickness is reduced, but electrostatic charges accumulate on the display cell surface causing malfunction
Solution Approach 1:
A protective layer is introduced as an intermediary component between the detection electrode and the external environment. This protective layer serves as a mediator that prevents direct contact between electrostatic charges and the detection electrode, thereby maintaining touch panel reliability while preserving the integrated thin design.
Solution Approach 2:
The protective layer is constructed from composite materials that simultaneously provide electrical insulation to prevent charge accumulation and maintain optical transparency to preserve display functionality. This composite material approach resolves the contradiction by integrating multiple functional properties into a single thin layer.
2Reliability
If the protective layer covers the entire detection electrode area, then electrostatic protection is improved, but the external shape becomes larger than necessary
Solution Approach 1:
The protective layer is designed with local quality by extending only to the peripheral regions where electrostatic charge accumulation occurs, rather than covering the entire detection electrode area. This localized approach provides sufficient electrostatic protection while minimizing the protective layer area and maintaining a compact device form factor.
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 suppresses electrostatic charging, enhancing the reliability and functionality of the touch panel by ensuring that electrostatic charges are released outside quickly, thus preventing malfunctions and maintaining the display's performance.
Implementation Method 1
the protective layer is made of a conductive and insulating material to quickly dissipate electrostatic charges
Data Source
AI summary
Provided is a display device including a touch panel, the display device having a function of being suppressed from being charged with electricity. A display device including a touch panel includes a detection electrode of the touch panel, the detection electrode being provided on one surface of a display cell; a protective layer covering the detection electrode; and an optical film bonded to the protective layer, the optical film having an external shape smaller than that of the protective layer. The protective layer may be a single layer substantially formed of a conductive polymer and an insulating material, or may have a stack structure including an insulating layer and a conductive layer.