Capacitive Touch Panel Conductive Film Peripheral Stability
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Solution Overview
Problem
Conventional capacitance-type touch panels with front and touch panels attached only at peripheral portions suffer from false operations due to changes in the thickness of the air layer between them, leading to incorrect input recognition.
Innovation Solution
A conductive film is placed on the touch panel to surround the effective touch area, supplied with a predetermined electric potential, and positioned to overlap the peripheral areas, preventing false reactions by maintaining a constant capacitance value regardless of the air layer thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the front panel and touch panel are attached only at peripheral portions using adhesives, then the front panel can be easily exchanged, but the interval between the front panel and touch panel becomes unstable causing false operations
Solution Approach 1:
A conductive film is introduced as an intermediary element between the front panel and the touch panel. This conductive film is attached to the front panel at peripheral portions and extends to overlap with the effective touch area, serving as a mediator that stabilizes the electrical environment without preventing front panel replacement
Solution Approach 2:
The conductive film is connected to a reference potential (ground) to create an equipotential region that stabilizes the electrical potential in the peripheral areas of the touch panel, preventing false operations caused by potential fluctuations from air layer thickness changes
2Ease of operation
If the front panel is pressed hard, then the air layer thickness changes, but this causes false reactions at peripheral portions due to capacitance changes
Solution Approach 1:
The conductive film acts as an intermediary that shields the touch panel electrodes from electrical fluctuations caused by air layer thickness changes. By providing a stable reference potential, it prevents these mechanical pressing actions from causing false capacitive reactions
Solution Approach 2:
The invention converts the harmful effect of air layer thickness changes into a beneficial shielding effect. The conductive film utilizes the same mechanical pressing that causes the problem to also compress the film against the front panel, enhancing the shielding effect and stabilizing the electrical environment
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
This solution effectively prevents false operations at the peripheral portions of the touch panel by stabilizing the capacitance value, ensuring accurate input detection.
Implementation Method 1
the capacitance-type touch panel includes a plurality of X-electrodes and Y-electrodes... detect the capacity of each electrode... the capacitance-type touch panel and the front panel are attached to each other at peripheral portions... a conductive film that is provided so as to surround an effective touch area... is provided on the uppermost layer of the capacitance-type touch panel
Data Source
AI summary
The present invention provides a display device having a touch panel including: a display panel; a capacitance-type touch panel arranged on the display panel; and a front panel arranged on the capacitance-type touch panel, wherein the capacitance-type touch panel includes a plurality of X-electrodes and Y-electrodes, the capacitance-type touch panel and the front panel are attached to each other at peripheral portions of the capacitance-type touch panel using adhesives, a conductive film that is provided so as to surround an effective touch area of the capacitance-type touch panel is provided on the uppermost layer of the capacitance-type touch panel, predetermined electric potential is supplied to the conductive film, and the conductive film overlaps peripheral portions of the effective touch area of the capacitance-type touch panel in planar view.