Capacitive Touch Panel Layout for Pressure Sensing Without Display Loss
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Solution Overview
Problem
Existing touch input devices struggle to detect the magnitude of touch pressure without degrading the performance of the display module.
Innovation Solution
A touch input device comprising a display panel with a touch sensor that includes driving and receiving electrodes, a controller, and a pressure detection module, which uses capacitance changes to detect both touch position and pressure by applying driving signals and sensing signals through electrode patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch sensor panel is attached to the front side of the display screen, then touch detection capability is improved, but display clarity and optical transmittance are degraded
Solution Approach 1:
The patent moves the pressure detection function from the front surface (2D plane affecting display) to the bottom surface of the display module (another dimension). The electrode pattern is disposed on the bottom surface of the display panel, separating the display optical path from the sensing elements, thus maintaining display clarity while enabling touch and pressure detection.
Solution Approach 2:
The patent introduces an intermediary electrode pattern on the bottom surface of the display panel that mediates between the display module and the touch detection system. This electrode pattern receives driving signals from the controller and transmits sensing signals, enabling touch and pressure detection without interfering with the display's optical properties.
2Measurement precision
If touch pressure detection is added to the touch screen, then pressure magnitude detection is improved, but device complexity increases
Solution Approach 1:
The electrode pattern on the bottom surface serves multiple functions: it acts as a driving electrode for touch detection, a receiving electrode for sensing touch position, and a pressure detection element for measuring pressure magnitude. By making the electrode pattern multi-functional, the patent avoids adding separate components for each function, thus reducing overall device complexity while achieving precise pressure detection.
Solution Approach 2:
The patent merges the touch detection and pressure detection functions into a single integrated system using the electrode pattern on the bottom surface. The same electrode structure is used for both detecting touch position and measuring pressure magnitude, combining multiple functions into one component to simplify the device architecture.
3Measurement precision
If electrode pattern is disposed on the bottom surface of display panel, then pressure detection sensitivity is improved, but manufacturing complexity increases
Solution Approach 1:
The electrode pattern is integrated into the bottom surface of the display panel during the display module manufacturing process, before the touch detection system is assembled. This preliminary integration allows the electrode pattern to be manufactured using existing display manufacturing techniques, avoiding the need for separate complex assembly steps and reducing overall manufacturing complexity.
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
Simultaneously detects touch position and pressure without compromising the display module's performance, improving detection sensitivity and maintaining display clarity and optical transmittance.
Implementation Method 1
The touch input device may comprise a controller that may be configured to provide a first driving signal to the driving electrode of the touch sensor. The controller may be configured to receive a touch detection signal from the receiving electrode of the touch sensor.
Data Source
AI summary
A touch input device is disclosed that may comprise a display panel and/or a touch sensor. The touch sensor may include a driving electrode and/or a receiving electrode that may be disposed on the display panel and/or inside the display panel. The touch input device may comprise an electrode pattern that may be disposed on a bottom surface of the display panel. The touch input device may comprise a controller that may be configured to provide a first driving signal to the driving electrode of the touch sensor. The controller may be configured to receive a touch detection signal from the receiving electrode of the touch sensor. The controller may be configured to detect a touch position, perhaps for example based on the touch detection signal. The controller may be configured to provide a second driving signal different from the first driving signal to the electrode pattern.