Display-to-Touch Noise Compensation Using Predictive Display Data
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Solution Overview
Problem
The interference noise between display and input devices, particularly in thinner and sleeker touch display devices, affects user experience and device functionality due to electromagnetic interference caused by simultaneous operation of display and input devices.
Innovation Solution
A noise compensation system that utilizes display data to predict and generate estimated noise compensation data, which is applied to touch data to mitigate the effect of display-to-touch noise during display updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If display and input devices operate simultaneously in thinner devices, then device sleekness and integration are improved, but electromagnetic interference noise increases
Solution Approach 1:
The system performs preliminary actions by obtaining display data before touch data acquisition, determining estimated noise compensation data in advance, and applying compensation to mitigate interference effects before they degrade touch sensing performance
Solution Approach 2:
The patent introduces an intermediary processing system that acts as a mediator between the display device and input device. This processing system obtains display data, determines estimated noise compensation data based on the display data, and applies this compensation to touch data to reduce electromagnetic interference effects
2Productivity
If display updates occur during touch sensing, then display refresh performance is improved, but touch data accuracy deteriorates due to noise
Solution Approach 1:
The system uses feedback by obtaining display data that reflects the current display state, determining estimated noise compensation data based on this feedback information, and applying the compensation to correct touch data measurements affected by display updates
Solution Approach 2:
The processing system performs preliminary actions by obtaining display data before touch data acquisition, determining estimated noise compensation data in advance, and applying compensation to mitigate interference effects before they degrade touch sensing performance
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
Minimizes interference noise between display and input devices, improving input sensing performance and overall user experience by subtracting expected noise from touch data during display updates.
Implementation Method 1
interference noise between the display and input devices... electromagnetic interference caused by simultaneous operation of display and input devices
Data Source
AI summary
A system for noise compensation include: an input device comprising a plurality of sensor electrodes configured to obtain touch data; a display device configured to provide display data for display on a display; and a processing system configured to: obtain the display data, the display data comprising first display data for updating a plurality of subpixels of the display during a first display update period; determine, based on the first display data, estimated noise compensation data for the plurality of subpixels for the first display update period; and apply the estimated noise compensation data to touch data obtained during the first display period to mitigate an effect of display-to-touch noise on the touch data obtained during the first display update.