Pressure Touch Electrode Placement in Display Devices
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Solution Overview
Problem
In display devices with both capacitive and pressure touch panels, interference between touch electrodes leads to noise in sensing signals, reducing sensitivity and image quality due to the placement of pressure electrodes and polarizing films.
Innovation Solution
A display device design where the first pressure electrode is adhered to a polarizing film on the display panel, with a second pressure electrode spaced apart and a light guide plate and optical sheet configured to minimize interference and enhance sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first pressure electrode is disposed between the first substrate and the first polarizing film, then the pressure touch panel can be configured, but interference occurs between the first pressure electrode and the capacitive touch panel electrodes, adding noise to sensing signals
Solution Approach 1:
The patent moves the first pressure electrode from the traditional position between the substrate and polarizing film to a position on the outer surface of the polarizing film. This spatial relocation in a different dimension eliminates the interference path between the pressure electrode and capacitive touch electrodes while preserving the pressure sensing function through the light guide plate and optical sheet.
2Ease of manufacture
If the first polarizing film is disposed between the first pressure electrode and the second pressure electrode, then the polarizing function is achieved, but the interval between pressure electrodes increases, reducing sensitivity of the pressure touch sensing signal
Solution Approach 1:
The patent segments the optical path by placing the light guide plate and optical sheet between the pressure electrodes, allowing the first polarizing film to be positioned on the outer surface of the first pressure electrode. This segmentation enables the polarizing function to be maintained while reducing the effective interval between pressure electrodes, thereby preserving sensing sensitivity.
3Ease of manufacture
If a light guide plate or optical sheet is disposed between the first polarizing film and the second pressure electrode, then light guidance is achieved, but the sensitivity of the pressure touch sensing signal is further reduced
Solution Approach 1:
The patent repositions the light guide plate and optical sheet to be located between the first pressure electrode and the first polarizing film, rather than between the polarizing film and the second pressure electrode. This dimensional reconfiguration allows the light guidance function to be maintained while minimizing the impact on the electric field interaction between pressure electrodes, thereby preserving sensing sensitivity.
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 configuration reduces interference between touch sensing signals, enhances sensitivity, and improves image quality by optimizing the placement of pressure electrodes and polarizing films.
Implementation Method 1
the touch sensing unit may sense a capacitance variation of each of touch electrodes included in a touch panel when a finger contacts the touch panel
Implementation Method 2
a first polarizing film adhered to a first side surface of the display panel, a second polarizing film adhered to a second side surface of the display panel
Data Source
AI summary
Discussed is a display device in which a first pressure electrode configuring a pressure touch panel is adhered to a first polarizing film attached on a lower end of a panel. The display device includes a display panel displaying an image, a capacitive touch panel provided in the display panel and including a plurality of touch electrodes, a first polarizing film adhered to a first side surface of the display panel, a first pressure electrode part adhered to a first side surface of the first polarizing film and including a first pressure electrode, and a second pressure electrode part spaced apart from the first pressure electrode part and including a second pressure electrode facing the first pressure electrode.