Touch Display Driving Circuit for Simultaneous Sensing and Imaging
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Solution Overview
Problem
Conventional touch display devices struggle to perform high-speed image display and touch sensing simultaneously, often requiring separate times for each function, leading to inefficiencies.
Innovation Solution
A touch display device with integrated circuits that enable simultaneous image display and touch sensing by using a touch-driving signal with a predetermined amplitude, adjusting gate and data signals during high-level periods, and applying a common voltage to touch electrodes for both functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If display function and touch function are performed at different times, then each function can be completed separately, but high-speed image display and high-speed touch sensing cannot be achieved simultaneously
Solution Approach 1:
The patent merges the display function and touch sensing function into a single time period. The touch electrode serves dual purposes: as a display electrode for image rendering and as a touch sensing electrode for detecting user input. This is achieved by applying a touch driving signal to the touch electrode while simultaneously driving data lines and gate lines for display operation, thereby eliminating the need for separate time periods and enabling high-speed simultaneous operations.
Solution Approach 2:
The touch electrode is designed to perform multiple functions: it acts as both a display electrode for showing images and a touch sensing electrode for detecting user interactions. The driving circuit applies a touch driving signal to the touch electrode during display operation, allowing the same physical component to serve dual purposes without requiring additional electrodes or separate operational phases.
2Productivity
If touch electrode is driven with touch driving signal during display operation, then simultaneous display and touch sensing is enabled, but image distortion may occur
Solution Approach 1:
The patent employs parameter changes to maintain image quality while enabling touch sensing. The driving circuit adjusts the voltage levels of data signals and gate signals based on the amplitude of the touch driving signal. When the touch driving signal has a high level, the circuit modifies the data and gate signal parameters accordingly to compensate for potential image distortion, ensuring that the displayed image remains accurate and undistorted during simultaneous touch sensing operations.
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 without image distortion, allowing for simultaneous operations in high-resolution displays.
Implementation Method 1
a capacitive touch mode 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, such as a finger
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.