Touch Control Display Panel with Piezoresistive Sensing
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Solution Overview
Problem
Conventional capacitive touch devices can only detect two-dimensional touch events and are unable to detect pressure, which limits their functionality in applications requiring three-dimensional touch detection.
Innovation Solution
A touch control display panel with a black matrix layer comprising non-sensing and sensing portions, along with first and second electrode layers, that undergo a restorable change in electrical resistivity in response to pressure, allowing for the detection of pressure and position through changes in electrical resistivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional capacitive touch devices are used, then the device can detect two-dimensional touch location, but it cannot detect pressure (third dimension)
Solution Approach 1:
The black matrix layer is segmented into non-sensing portions and multiple sensing portions spaced apart from each other. Each sensing portion functions as an independent pressure sensor, allowing the system to detect pressure information while maintaining the original two-dimensional location detection capability.
Solution Approach 2:
The black matrix layer is given multiple functions: it continues to serve as a light-blocking structure while simultaneously acting as a pressure sensing element through the integrated sensing portions. This multi-functional design enables both 2D location and 3D pressure detection without adding separate components.
2Adaptability or versatility
If sensing portions are added to the black matrix layer, then pressure detection is enabled, but device structure becomes more complex
Solution Approach 1:
The pressure sensing function is merged into the existing black matrix layer by forming sensing portions within it. The first electrode layer and second electrode layer are combined with the sensing portions to create integrated touch units, eliminating the need for separate pressure sensing components and reducing overall device complexity.
Solution Approach 2:
The black matrix layer serves dual purposes as both a light-blocking structure and a pressure sensing element. The sensing portions within the black matrix layer detect pressure through resistivity changes, allowing one component to fulfill multiple functions without significantly increasing structural complexity.
3Measurement precision
If the black matrix layer is made thicker to accommodate sensing portions, then pressure detection sensitivity improves, but light transmission to display elements is reduced
Solution Approach 1:
The black matrix layer exhibits local quality variation: the non-sensing portions maintain standard thickness for effective light blocking, while the sensing portions have increased thickness to enhance pressure detection sensitivity. This localized thickness variation allows each region to optimize its function without compromising the other.
Solution Approach 2:
The black matrix layer is divided into segments with different thicknesses: thinner non-sensing portions that allow light transmission and thicker sensing portions that provide pressure sensitivity. The segmented structure enables simultaneous optimization of both light transmission and pressure detection performance.
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
Enables accurate detection of pressure and position of a touch event, enhancing the functionality of touch control display panels without the need for polarizers, thereby reducing costs and improving display performance.
Implementation Method 1
a respective one of the plurality of sensing portions is configured to undergo a restorable change in electrical resistivity in response to a pressure from a touch
Data Source
AI summary
A touch control display panel is provided. The touch control display panel includes a base substrate; and a black matrix layer on the base substrate and in an inter-subpixel region of the touch control display panel. The black matrix layer includes a non-sensing portion, and a plurality of sensing portions spaced apart from the non-sensing portion. The touch control display panel further includes a first electrode layer including a plurality of first electrode blocks respectively between the plurality of sensing portions and the base substrate; and a second electrode layer including a plurality of second electrode blocks respectively on a side of the plurality of sensing portions away from the first electrode layer. A respective one of the plurality of sensing portions is configured to undergo a restorable change in electrical resistivity in response to a pressure from a touch.