Capacitive Pressure Detection for Curved Display Modules
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Solution Overview
Problem
Existing touch input devices struggle to efficiently detect touch position and pressure across various types and shapes of display modules, particularly lacking in mechanical button alternatives that are simple in design and cost-effective.
Innovation Solution
A touch input device incorporating a display module with a flat and curved portion, along with a pressure detection module under the display module, which detects touch pressure based on capacitance changes between electrodes and a reference potential layer, allowing for efficient detection regardless of display module type or shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a mechanical button is used for touch input, then the device structure is simple and cost-effective, but the device cannot detect touch pressure efficiently and has mechanical defects
Solution Approach 1:
The patent replaces the mechanical button system with a capacitive sensing system. The touch sensor panel includes capacitance sensing electrodes that detect touch pressure through capacitance changes, eliminating mechanical components while enabling precise pressure detection. This substitution resolves the contradiction by providing accurate measurement without mechanical complexity.
2Adaptability or versatility
If various types and shapes of display modules are used, then the device versatility is improved, but the touch pressure detection efficiency decreases
Solution Approach 1:
The patent implements a universal pressure detection structure where the touch sensor panel with capacitance sensing electrodes can be integrated with various types and shapes of display modules. The sensing electrodes are arranged to work with different display configurations (flat, curved, various sizes), enabling the same detection mechanism to efficiently detect touch pressure across diverse display module types, thus resolving the contradiction between versatility and detection efficiency.
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 precise detection of touch position and pressure, simplifies design by eliminating mechanical buttons, reduces manufacturing costs, and enhances durability by avoiding mechanical defects.
Implementation Method 1
The pressure detection module detects the touch pressure on the basis of a capacitance change amount according to a distance change between a reference potential layer and the pressure detection module
Data Source
AI summary
A touch input device which includes a display module and is capable of detecting a pressure may be provided. The touch input device includes: a display module including a flat portion and at least one curved portion which extends from the flat portion and is curved with a predetermined curvature; and a pressure detection module which is formed under the display module and detects a touch pressure applied to a surface of the display module. The pressure detection module detects the touch pressure on the basis of a capacitance change amount according to a distance change between a reference potential layer and the pressure detection module. As a result, the touch input device including various types and forms of the display modules is capable of efficiently detecting the touch position and touch pressure.