Plug-in Touch Display with Pixel Electrode Pressure Sensing
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Solution Overview
Problem
Current pressure sensing touch-enabled devices for liquid crystal displays require complex structural designs and additional sensors, which negatively impact display quality and increase production difficulties, with limited spatial resolution.
Innovation Solution
A plug-in touch display device with a capacitive touch screen and display module, where the second capacitive sensing electrode is arranged between the middle frame and the backlight module, forming an electrode-induction device with the pixel electrode layer to sense pressure signals, using ITO for the second capacitive sensing electrode, integrated with a touch and pressure sensor driver chip for efficient three-dimensional touch functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional pressure sensors are configured in the display to achieve pressure sensing touch-enabled function, then pressure sensing capability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The pixel electrode layer is designed to perform dual functions: displaying image information and sensing pressure signals. By making the pixel electrode layer capable of both display and pressure sensing, the patent eliminates the need for separate pressure sensors, thereby reducing device complexity while maintaining pressure sensing capability
Solution Approach 2:
The patent combines the display function and pressure sensing function into a single integrated structure. The pixel electrode layer serves as both the display element and the pressure sensing element, merging two previously separate functions into one unified component
2Measurement precision
If the number of pressure sensors is increased to improve spatial resolution, then pressure sensing precision is improved, but display quality deteriorates
Solution Approach 1:
The pixel electrode layer performs dual functions as both display element and pressure sensing element, eliminating the need for separate pressure sensors that would compromise display quality. This multi-functional design maintains display quality while enabling pressure sensing capability
3Measurement precision
If additional pressure sensors are added to achieve pressure sensing function, then pressure sensing capability is improved, but manufacturing cost increases
Solution Approach 1:
The pixel electrode layer is designed to perform dual functions of display and pressure sensing, eliminating the need for separate pressure sensors and reducing manufacturing costs
Solution Approach 2:
The pixel electrode layer serves itself by performing both display and pressure sensing functions, eliminating the need for additional components and reducing overall manufacturing complexity and cost
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 simplifies the structure, reduces production costs, and maintains display quality by enabling three-dimensional touch functionality without compromising the liquid crystal display, using a transparent ITO electrode on the backlight module.
Implementation Method 1
the first capacitive sensing electrode and the second capacitive sensing electrode configure an electrode-induction device jointly, which are used for sensing the pressure signal applied on the capacitive touch screen
Data Source
AI summary
A plug-in touch display device includes a capacitive touch screen stacked on a display module. The display module includes a display panel and a backlight module that are supported in a middle frame. The display panel includes an array substrate that includes a pixel electrode, which also serves as a first capacitive sensing electrode. The middle frame has one side facing the backlight module and receiving a second capacitive sensing electrode arranged therein. A gap exists between the second capacitive sensing electrode and backlight module. The first capacitive sensing electrode and the second capacitive sensing electrode configure an electrode-induction device jointly, for sensing a pressure signal applied on the capacitive touch screen. In a display time period of one frame, the pixel electrode transmits pixel voltage signals and pressure sensing signals alternately.