Touch Compensation Circuit for Stable Display Initialization Voltage
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Solution Overview
Problem
The overlap between display driving and touch driving in display devices leads to deterioration of image quality due to the effect of touch driving on display driving, particularly when the display unit and sensor unit are closely disposed.
Innovation Solution
Incorporation of a compensation circuit between the driving lines and the initialization line, which includes a resistor and a compensation capacitor, to adjust the initialization voltage in response to changes in the first power source voltage caused by touch driving, ensuring the initialization voltage changes by an amount equal to the change in the first power source voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display unit and sensor unit are closely disposed to improve device integration, then device compactness is improved, but image quality deteriorates due to interference between display driving and touch driving
Solution Approach 1:
A compensation circuit is introduced as an intermediary component between the display driving circuit and the sensor driving circuit. This compensation circuit includes a compensation capacitor that couples the initialization line and the power source line, serving as a mediator to transfer compensation signals that cancel out the interference effects between touch driving and display driving, thereby resolving the image quality deterioration caused by close disposition
2Speed
If touch driving is performed during display driving period to improve touch response speed, then touch response time is improved, but image quality deteriorates due to voltage fluctuations
Solution Approach 1:
The compensation circuit performs preliminary compensation by coupling the initialization line and power source line through a compensation capacitor. This preliminary action establishes a compensation signal path that proactively counteracts voltage fluctuations before they affect the display output, enabling touch driving during the display period without image quality degradation
3Device complexity
If initialization voltage is kept constant to simplify circuit design, then circuit complexity is reduced, but image quality deteriorates due to power source voltage changes during touch driving
Solution Approach 1:
The compensation capacitor acts as an intermediary that automatically adjusts the initialization voltage in response to power source voltage changes. This passive compensation mechanism maintains image quality without requiring complex active control circuits, achieving voltage stabilization with minimal additional circuit complexity
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
The compensation circuit effectively prevents image quality deterioration by stabilizing the initialization voltage, maintaining consistent luminance of the light emitting elements despite touch driving influences.
Implementation Method 1
A capacitance of the compensation capacitor may be the same as a capacitance of a capacitor formed between the plurality of driving lines and the first power source line
Data Source
AI summary
A display device includes a display unit including a plurality of pixels connected to an initialization line and a first power source line, a sensor unit provided on the display unit and including a plurality of driving electrodes, a sensor driver providing a touch driving voltage to a plurality of driving lines connected to the plurality of driving electrodes, a power supply providing an initialization voltage to the initialization line and providing a first power source voltage to the first power source line, and a compensation circuit compensating for the initialization voltage.