Touch Display Driving Circuits for Simultaneous Image and Touch Sensing
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Solution Overview
Problem
Conventional touch-sensing-enabled display devices struggle with high-speed image display and touch sensing, as these functions are typically performed at different times, leading to inefficiencies and delays in completing both operations.
Innovation Solution
A touch display device with integrated circuits for driving data, gate, and touch electrodes, where touch-driving signals with a predetermined amplitude synchronize with data and gate signals to enable simultaneous high-speed image display and touch sensing, using a self-capacitance touch-sensing mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If display function and touch function are performed at different times, then each function can be completed, but the overall operation speed is reduced and time efficiency deteriorates
Solution Approach 1:
The patent merges the display function and touch sensing function into a single integrated operation by applying both data signals for image display and touch-driving signals for touch sensing simultaneously to the same display panel. This allows both functions to be performed in parallel rather than sequentially, resolving the contradiction between reliable function completion and operation time efficiency.
Solution Approach 2:
The display panel is designed to serve multiple functions simultaneously - it acts as both the display medium for image output and the sensing medium for touch detection. The same physical structure (display panel with electrodes) performs dual roles, enabling high-speed simultaneous operation of display and touch functions without requiring separate dedicated hardware for each function.
2Speed
If touch-driving signal amplitude is increased to improve touch sensing speed, then touch sensing performance improves, but image display quality may deteriorate due to signal interference
Solution Approach 1:
The patent applies different signal characteristics to different spatial locations within the display panel. Touch-driving signals with higher amplitude are applied to touch electrodes for sensitive touch detection, while data signals for image display are applied to data lines with controlled amplitude. This local differentiation of signal properties allows high-speed touch sensing without compromising overall image display quality.
Solution Approach 2:
The touch-driving signal is designed with periodic characteristics where the amplitude modulation occurs at specific timing intervals that do not interfere with the image display refresh cycle. By synchronizing the periodic touch signal with the display timing, the system achieves high-speed touch sensing while maintaining stable image display without mutual interference.
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 high-speed image display and touch sensing simultaneously without image distortion, allowing for efficient and synchronized performance of both functions.
Implementation Method 1
a capacitive touch mode is frequently adopted, which detects the occurrence of a touch and the coordinates of a touch based on a change in capacitance between touch electrodes or a change in capacitance between a touch electrode and a pointer
Data Source
AI summary
The present embodiments may provide a touch display device including: a display panel in which a plurality of data lines, a plurality of gate lines, and a plurality of touch electrodes are disposed; a gate-driving circuit configured to drive the plurality of gate lines; a data-driving circuit configured to drive the plurality of data lines; and a touch-driving circuit configured to drive the plurality of touch electrodes while the plurality of data lines and the plurality of gate lines are driven. In this touch display device, while a touch-driving signal swings with a predetermined amplitude, a data signal and a gate signal may also swing with the predetermined amplitude. According to the present embodiments, it is possible to enable high-speed image display and high-speed touch sensing, to perform a display operation and a touch operation simultaneously, and to display an image normally without any image change.