Adaptive Noise-Sensing Touch Circuits for Large Display Panels
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Solution Overview
Problem
As display device screen sizes increase, noise generated by the display panel adversely affects the sensitivity of touch sensors, leading to reduced performance.
Innovation Solution
A display device with a sensor unit incorporating touch driving electrodes, touch sensing electrodes, and noise sensing electrodes, along with a touch driving circuit that compensates for touch sensing signals using noise signals received from noise sensing channels, and a host that determines noise levels based on device states and screen content to optimize signal compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the screen size of the display device is increased, then the display area and visual quality are improved, but the noise generated by the display panel increases and adversely affects the sensitivity of the touch sensor
Solution Approach 1:
The patent segments the sensing function by introducing separate noise sensing electrodes distinct from the touch sensing electrodes. This segmentation allows the system to independently detect and process noise signals separately from touch signals, thereby mitigating the adverse effect of display panel noise on touch sensor sensitivity while maintaining large screen area.
Solution Approach 2:
The patent introduces noise sensing electrodes as an intermediary element between the display panel and the touch sensing system. These intermediate electrodes specifically detect noise signals generated by the display panel, allowing the system to identify and compensate for noise interference without affecting the primary touch sensing function.
2Measurement precision
If noise sensing channels are continuously activated to compensate for display panel noise, then touch sensor sensitivity is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by activating noise sensing channels only during vertical blank periods when no touch sensing is performed. During these intervals, the system measures noise levels and updates compensation parameters. This periodic activation maintains touch sensing accuracy while significantly reducing power consumption compared to continuous noise sensing.
Solution Approach 2:
The system performs self-service by automatically adjusting noise compensation levels based on measured noise conditions without requiring continuous active sensing. The noise sensing channels measure noise characteristics and the system autonomously applies appropriate compensation, enabling accurate touch detection with minimal energy expenditure.
Data Source
AI summary
A display device includes a display panel, a sensor unit overlapping the display panel and including a plurality of touch driving electrodes, a plurality of touch sensing electrodes, and a plurality of noise sensing electrodes, and a touch driving circuit supplying a driving signal to the plurality of touch driving electrodes and receiving a touch sensing signal from the plurality of touch sensing electrodes. The touch driving circuit is configured to receive a noise level signal indicating a noise level of the display panel from a host that generates image data, select at least some noise sensing channels among a plurality of noise sensing channels connected to the plurality of noise sensing electrodes, based on the noise level signal, receive a noise signal using at least some of the selected noise sensing channels, and compensate for the touch sensing signal using the received noise signal.