Touch Screen Electrode Integration for Force Detection
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Solution Overview
Problem
Current display technologies with force touch functions face challenges in accuracy and cost due to complex assembly requirements and high production costs, limiting the widespread adoption of pressure-sensitive touch control in displays like mobile phones and flat panels.
Innovation Solution
A touch screen design utilizing a self-capacitance principle with a common electrode and a shielding electrode, where the common electrode serves as the first drive electrode and the fixed electrode assists in force touch detection, reducing production complexity and costs while improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a force touch mechanism is additionally provided in a backlight part or middle frame of a display, then the display can achieve pressure-sensitive touch control function, but the structure complexity increases and assembly tolerance becomes large which limits detection accuracy
Solution Approach 1:
The patent merges the force touch detection function with the existing liquid crystal display structure by integrating drive electrodes and sensing electrodes directly into the display panels. The common electrode of the liquid crystal cell serves dual purposes: as a drive electrode for liquid crystal control and as a sensing electrode for force touch detection, eliminating the need for separate force touch mechanisms in the backlight or middle frame.
Solution Approach 2:
The patent implements multi-functionality by enabling the liquid crystal display electrodes to perform both display control and force touch detection. The first drive electrode and second drive electrode of the liquid crystal cell are utilized as sensing electrodes, allowing the same structural components to serve multiple functions and reducing overall device complexity.
2Adaptability or versatility
If a force touch mechanism is additionally provided in a backlight part or middle frame of a display, then the display can achieve pressure-sensitive touch control function, but the assembly tolerance is large which greatly limits the accuracy of force detection
Solution Approach 1:
The patent combines force touch detection with the intrinsic structure of the liquid crystal display, using the display's own electrodes as sensing elements. This integration eliminates assembly interfaces between separate components, thereby minimizing assembly tolerance and significantly improving force detection accuracy.
Solution Approach 2:
The patent divides the detection function into multiple independent electrode regions (first drive electrode, second drive electrode, common electrode) that can be independently controlled and measured. This segmentation allows for more precise localization and measurement of touch forces at different positions.
3Adaptability or versatility
If a force touch mechanism is additionally provided in a backlight part or middle frame of a display, then the display can achieve pressure-sensitive touch control function, but the production and assembly costs increase
Solution Approach 1:
The patent achieves cost reduction by making existing display components multi-functional. The liquid crystal cell electrodes serve both display and force touch detection purposes, eliminating the need for additional force touch mechanism components and reducing material costs, assembly steps, and production complexity.
Solution Approach 2:
The patent merges force touch detection functionality into the existing liquid crystal display manufacturing process. By integrating the sensing electrodes with the display electrodes, the patent eliminates separate assembly steps for installing force touch mechanisms, thereby reducing assembly costs and simplifying production.
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 enables accurate force touch detection with reduced production and assembly costs, facilitating the rapid and widespread promotion of pressure-sensitive touch control in displays.
Implementation Method 1
the common electrode serves as a first drive electrode in force touch... the fixed electrode is configured to assist the first drive electrode to detect a touch force in force touch
Data Source
AI summary
The present invention provides a touch screen, a driving method thereof, and a display apparatus. The touch screen includes a liquid crystal cell formed by assembling an array substrate and a color filter substrate and a fixed electrode provided at a side of the array substrate distal to the color filter substrate, and further includes a common electrode provided on the array substrate and a shielding electrode provided at a side of the common electrode distal to the fixed electrode, the common electrode serves as a first drive electrode in force touch, a position of the fixed electrode corresponds to that of the common electrode, and the fixed electrode is configured to assist the first drive electrode to detect a touch force in force touch.