Touch Display Data Driving Circuit Simultaneous Sensing
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Solution Overview
Problem
Touch display devices face challenges in implementing large sizes due to complexity and increased size caused by separate touch sensor structures, which also lead to insufficient display and touch driving times.
Innovation Solution
A touch display device design that integrates touch sensing capability without a separate touch sensor structure, using a display panel with intersecting data and gate lines, a gate driving circuit, and a data driving circuit with a sensing circuit that groups data lines and outputs image data voltages, allowing simultaneous display and touch sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate touch sensor structure is added to the display device, then touch sensing capability is improved, but device complexity and size increase
Solution Approach 1:
The patent merges the touch sensing function with the display driving structure by using the same data lines and gate lines for both display driving and touch sensing. The data driving circuit is configured to perform both display data output and touch sensing operations, eliminating the need for separate touch sensor structures and reducing overall device complexity while maintaining dual functionality.
Solution Approach 2:
The data lines and gate lines are designed to serve multiple purposes: they function as signal transmission lines for display driving and simultaneously as sensing electrodes for touch detection. The data driving circuit universally handles both display data output and touch sensing signal processing, allowing one structure to fulfill multiple functions without requiring additional dedicated components.
2Adaptability or versatility
If a separate touch sensor structure is added, then touch sensing function is enabled, but manufacturing difficulty increases
Solution Approach 1:
The manufacturing process is simplified by combining touch sensing electrode formation with the existing display electrode fabrication steps. The same transparent conductive oxide layers and patterning processes used for display electrodes are utilized to create touch sensing electrodes, eliminating the need for separate manufacturing stages and reducing overall manufacturing complexity.
3Measurement precision
If separate touch driving and display driving are performed sequentially, then touch sensing accuracy is improved, but display driving time becomes insufficient
Solution Approach 1:
The patent enables continuous operation by performing touch sensing and display driving simultaneously rather than sequentially. The data driving circuit continuously outputs display data while concurrently performing touch sensing operations on the same data lines, ensuring that display driving time is not reduced while maintaining touch sensing functionality through overlapping operational phases.
Solution Approach 2:
The touch sensing operation is performed periodically during the display driving cycle by utilizing specific time slots within the continuous display refresh cycle. The data driving circuit periodically switches between display data output mode and touch sensing mode on the same data lines, allowing both functions to operate in an interleaved manner that maintains display continuity while enabling regular touch sensing updates.
Data Source
AI summary
Embodiments of the present disclosure relate to a touch display device, a data driving circuit, and a touch sensing method. By sensing multiple data lines simultaneously using gate signals for display as touch driving pulses, it is possible to provide touch sensing without having a separate touch electrode for touch sensing and touch driving pulses. The touch sensing method includes outputting gate signals sequentially having a pulse section including two or more pulses to gate lines, by a gate driving circuit; outputting an image data voltage to data lines, by a source driving circuit; sensing the data lines by combining every N (N is a natural number of 2 or more) data lines or sensing a plurality of reference voltage lines by combining every N reference voltage lines, by a sensing circuit; and determining a touch or a touch coordinate, based on sensing values obtained by sensing of the sensing circuit.