Touch Sensor Driver Transition Voltage Stabilization
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Solution Overview
Problem
Display devices with touch sensors experience touch insensitivity and increasing inaccuracy due to undesirable voltage charging and instability in data lines, primarily caused by external and internal light acting as noise sources.
Innovation Solution
A display device with a touch sensor includes a driver that outputs a set voltage during the transition period between the display period and the touch sensing period, which helps maintain data line stability and reduces noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display panel operates during the display period, then image display function is achieved, but data lines become unstable due to light noise during transition to touch sensing period
Solution Approach 1:
The driver outputs a set voltage during the transition period before the touch sensing period begins. This preliminary action stabilizes the data lines in advance, preventing voltage fluctuations and noise interference that would otherwise occur when transitioning from the display period to the touch sensing period, thereby ensuring accurate touch sensor detection
Solution Approach 2:
The patent converts the harmful effect of light noise (from external or internal sources) into a beneficial outcome by applying a set voltage during the transition period. This approach transforms the problematic transition phase, where light noise typically causes data line instability, into an opportunity to proactively stabilize voltages and eliminate noise interference before touch sensing begins
2Productivity
If the driver outputs data voltage during display period, then image is displayed, but touch sensor becomes insensitive due to voltage interference
Solution Approach 1:
The patent divides the operating cycle into three distinct segments: display period, transition period, and touch sensing period. During the transition period, the driver outputs a set voltage instead of data voltage, creating a clear separation between display operations and touch sensing operations. This segmentation prevents voltage interference and ensures that touch sensor sensitivity is not compromised by display-related electrical noise
Solution Approach 2:
The set voltage output during the transition period acts as an intermediary state between the data voltage used during display and the high-impedance state required for accurate touch sensing. This intermediate voltage level serves as a bridge that stabilizes the data lines and eliminates interference, allowing both display and touch functions to operate reliably without directly conflicting with each other
Data Source
AI summary
The present disclosure provides a display device having a touch sensor, which includes a display panel including a touch sensor configured to display an image and sense presence or absence of a touch, a driver configured to time-division drive the display panel and the touch sensor, and a controller configured to control the driver, wherein the driver outputs a set voltage during a transition period between a display period in which an image is displayed on the display panel and a touch sensing period in which the touch sensor is sensed.