Display Device Touch Sensor Power Supply Segmentation
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Solution Overview
Problem
The integration of touch sensor drivers and data drivers in a single Integrated Circuit (SRIC) for display devices can lead to unstable touch sensing operations due to shared power supply, resulting in malfunctions and errors such as ghost touches and noise in touch data.
Innovation Solution
Separating the power supply paths for the data driver and touch sensor driver, and deactivating control signals during the touch sensing period to prevent interference, allowing the data driver and touch sensor driver to operate independently with separate power sources and timing control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If touch sensor driver and data driver are integrated in a single SRIC with shared power supply, then device complexity is reduced and manufacturing is simplified, but touch sensing stability deteriorates due to noise interference and parasitic capacitance
Solution Approach 1:
The patent segments the power supply system by providing separate power supply lines for the touch sensor driver and data driver within the integrated SRIC. This segmentation isolates the power consumption paths, preventing noise from the data driver from interfering with the touch sensor driver, thereby maintaining touch sensing stability while preserving circuit integration benefits.
Solution Approach 2:
The patent applies local quality by providing differentiated power supply conditions to different functional blocks within the SRIC. The touch sensor driver receives power through a dedicated power supply line with specific electrical characteristics optimized for low-noise analog operations, while the data driver uses a separate power supply line suited for digital switching operations. This localized optimization resolves the contradiction between integration and stability.
2Reliability
If separate power supply lines are provided for touch sensor driver and data driver, then touch sensing stability is improved by reducing noise interference, but device complexity increases
Solution Approach 1:
The patent merges the touch sensor driver and data driver into a single integrated SRIC chip, consolidating multiple functional blocks into one device. By integrating these functions while providing separate internal power supply lines, the patent achieves both circuit integration benefits and noise isolation, resolving the contradiction between simplicity and stability.
Solution Approach 2:
The patent introduces separate power supply lines as intermediary pathways between the power source and the functional blocks. These intermediary power lines act as isolated channels that prevent noise coupling between the touch sensor driver and data driver, enabling stable touch sensing operation within the integrated circuit without requiring complete physical separation of the drivers.
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
This solution stabilizes touch sensing operations by minimizing parasitic capacitance and reducing noise, thereby enhancing the Signal-to-Noise Ratio (SNR) and preventing malfunctions like ghost touches, resulting in improved touch sensitivity and accuracy.
Implementation Method 1
the touch sensors are capacitance-type touch sensors which senses a touch based on a variation of capacitance before and after the touch
Implementation Method 2
the touch sensors are coupled to pixels through a parasitic capacitance
Data Source
AI summary
Disclosed is a display device having touch sensors and a driving method thereof, and the display device includes an integrated circuit (IC) having a data driver and a touch sensor driver. The display device prevents malfunction of the touch sensor driver by separating at least one of power for the data driver and the touch sensor driver.