Touch Display Apparatus Force Sensing Circuit
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Solution Overview
Problem
Current touch display technologies only sense the user's touch position and are insufficient to meet the diverse functional requirements and user desires, as they do not account for the user's pressing force during the touch input process.
Innovation Solution
A touch display apparatus and driving circuit that senses both the touch position and touch force by utilizing a plurality of first electrodes embedded in the display panel and a second electrode positioned outside, with a gap between them that changes with the touch force, allowing for independent sensing of touch force during display and touch sensing periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only a single electrode structure is used for touch sensing, then the device structure is simple, but only touch position can be sensed without touch force
Solution Approach 1:
The electrode system is segmented into two distinct components: first electrodes embedded in the display panel for touch position sensing, and a second electrode positioned outside the display panel for touch force sensing. This segmentation allows each electrode to be optimized for its specific sensing function, enabling both touch position and touch force to be detected independently and simultaneously.
2Adaptability or versatility
If touch force sensing is added to the existing touch display, then diverse functions are enabled, but device complexity increases
Solution Approach 1:
The first electrodes serve dual purposes: they function as display electrodes during normal display operation and as touch sensing electrodes during touch input. This multi-functionality reduces the need for completely separate components, thereby limiting the increase in device complexity while still enabling both touch position and touch force sensing capabilities.
3Measurement precision
If separate sensing periods are used for touch position and touch force, then independent sensing is achieved, but time consumption increases
Solution Approach 1:
The touch display device operates with periodic alternation between display driving periods and touch sensing periods. During touch sensing periods, both touch position and touch force sensing are performed. This periodic structure allows independent and accurate sensing of both parameters while efficiently utilizing time by combining the sensing operations within the same sensing period rather than requiring completely separate time intervals.
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 the provision of various functions by sensing touch force and position simultaneously or independently, enhancing user interaction with touch display devices by incorporating force sensing into the touch input process.
Implementation Method 1
a touch display apparatus that can sense a touch force corresponding to a user's pressing force on a screen, as well as a touch position (touch coordinates), when a user's touch occurs
Data Source
AI summary
The present embodiments relate to a driving circuit and a touch display apparatus for sensing a user's touch position and touch force with respect to a display panel, and further relate to a driving method thereof. The touch display apparatus may include a plurality of first electrodes that are configured to be embedded in a display panel, and a second electrode that is configured to be positioned outside the display panel. The touch display apparatus may read a force sensing signal from the second electrode through a signal detecting unit that is electrically connected to the second electrode. Therefore, it is possible to sense a touch force without separating a force sensing signal from a signal received from the first electrode, and to sense a user's touch force through the driving of the second electrode regardless of the driving mode of the first electrode.