Touch Driving IC Noise Detection and Compensation
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Solution Overview
Problem
Miniaturization of touch display devices leads to issues with display noise interference, affecting the reliability of touch sensing operations due to parasitic capacitors between the touch and display panels, causing inaccuracies in user touch detection.
Innovation Solution
A touch driving integrated circuit (TDI) is used to detect and offset display noise by transmitting touch signals through specific transmission lines and receiving sensing signals through corresponding reception lines, improving the reliability of touch sensing operations by canceling noise from the sensing signals using detected display noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If miniaturization is pursued to reduce device size, then device dimensions are reduced, but display noise interference increases due to parasitic capacitors between touch and display panels
Solution Approach 1:
A dedicated detection line is introduced as an intermediary channel to separately detect display noise from the touch sensing signal. This detection line acts as a mediator that captures the noise component without interfering with the primary touch sensing function, enabling subsequent noise compensation in the sensing signal.
Solution Approach 2:
The signal transmission path is segmented into multiple independent channels: a first transmission line for touch signals, a second transmission line (detection line) for noise detection, and corresponding reception lines. This segmentation allows independent optimization of each channel's function, with the detection line dedicated solely to capturing display noise characteristics.
2Device complexity
If display noise is not compensated, then device complexity remains low, but touch sensing accuracy deteriorates due to noise interference
Solution Approach 1:
The system implements feedback by continuously monitoring display noise through the detection line and using this information to compensate for noise in the touch sensing signal. The noise detected on the second transmission line is fed back to correct the sensing signal on the first transmission line, maintaining high accuracy despite increased complexity.
Solution Approach 2:
The detection line performs preliminary noise acquisition before the noise can corrupt the touch sensing measurement. By detecting and characterizing the display noise in advance through the dedicated second transmission line, the system prepares compensation data that can be applied to subsequent touch sensing operations.
Data Source
AI summary
An operating method of a touch driving integrated circuit (TDI) sensing a user touch on a touch panel includes: transmitting a first touch signal through a transmission line connected with the touch panel; receiving a first sensing signal through a reception line connected to the touch panel; receiving a first display noise through a detection line connected to the touch panel; and offsetting a noise included in the first sensing signal by using the first display noise.