Touch-Display Driving Circuit Simultaneous Display and Touch Detection
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Solution Overview
Problem
Existing touch-display apparatuses face interference between display operations and touch detection operations, particularly during the touch detection period, due to the need for separate control periods for display and touch signals, which affects the display quality and increases with improved resolution.
Innovation Solution
A driving method and circuit that simultaneously perform pixel display and touch detection operations using a common electrode driving signal, which satisfies both voltage and waveform requirements for display and touch detection, allowing continuous operation without time-division control, utilizing signals like sine or cosine waves with specific amplitudes and frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time-division control is used to separate display and touch detection operations, then interference between operations is reduced, but display continuity is interrupted and detection accuracy is reduced
Solution Approach 1:
The patent merges the display operation and touch detection operation into a single simultaneous execution phase. The common electrode serves dual purposes: maintaining display voltage and detecting touch input. This eliminates the need for time-division control, allowing continuous display operation while simultaneously detecting touch events, thus resolving the contradiction between operational stability and display continuity.
Solution Approach 2:
The common electrode is designed to perform multiple functions simultaneously: it acts as both a display electrode maintaining the liquid crystal state and a touch detection electrode sensing user input. This multi-functionality allows the system to conduct display and touch detection operations concurrently without interference, eliminating the need for separate control periods.
2Reliability
If separate control periods are used for display and touch signals, then signal interference is minimized, but operational efficiency decreases
Solution Approach 1:
The patent combines display signal control and touch detection signal control into a single unified control period. The driving circuit simultaneously applies display voltage to the common electrode while detecting touch capacitance changes, eliminating the need for separate control periods and improving operational efficiency without sacrificing signal accuracy.
Solution Approach 2:
The system maintains continuous display operation and continuous touch detection capability throughout the entire scanning period. By using the common electrode for both display and touch functions simultaneously, the system ensures uninterrupted useful action for both operations, improving productivity while maintaining reliability.
3Illumination intensity
If common electrode voltage is optimized for display, then display quality is maintained, but touch detection sensitivity is reduced
Solution Approach 1:
The patent optimizes the parameters of the common electrode driving signal, specifically using a sine wave or cosine wave with frequency greater than a preset frequency. This parameter optimization allows the common electrode to simultaneously maintain display quality and provide sufficient sensitivity for touch detection, resolving the contradiction between display quality and touch detection sensitivity.
Solution Approach 2:
The system employs periodic sine wave or cosine wave signals for the common electrode driving. This periodic action at optimized frequencies enables the common electrode to maintain stable display performance while creating detectable capacitance variations for touch sensing, simultaneously achieving both display quality and touch detection sensitivity.
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
Ensures uninterrupted and accurate display operations while enabling simultaneous touch detection across the entire scanning period, improving detection accuracy and resolving the interference issues in touch-display apparatuses.
Implementation Method 1
providing a common electrode driving signal to common electrodes, wherein a pixel driving is performed based on the gate driving signal, the pixel voltages, and the common electrode driving signal
Implementation Method 2
a touch detection operation is simultaneously performed based on the common electrode driving signal
Data Source
AI summary
A driving method, a driving circuit and a touch-display apparatus are provided. The driving method includes providing a gate driving signal to a gate line, providing a pixel voltage to a data line, and providing a common electrode driving signal to a common electrode, wherein a pixel display operation is performed based on the gate driving signal, the pixel voltage, and the common electrode driving signal, and simultaneously, a touch detection operation is performed based on the common electrode driving signal. The driving method realizes the effect of simultaneously performing a pixel display operation and a touch detection operation, and solves the problem that the pixel display operation of the touch-display apparatus is affected in the touch detection stage.