Touch Display Noise Compensation via Scan Finishing Positions
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Solution Overview
Problem
Touch sensing operations in touch display devices are affected by noise interference from scan driving, leading to issues like ghost points and split points, which existing technologies have not effectively addressed.
Innovation Solution
A touch display device and operating method that include a touch display panel, a touch display driving circuit, and a computing circuit, where the computing circuit determines scan finishing positions based on scan frequency and touch sensing cycles, and compensates touch sensing data using a base value to reduce noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If scan driving is performed at high frequency to improve display refresh rate, then display performance is improved, but noise interference in touch sensing operation increases
Solution Approach 1:
The patent applies preliminary action by determining scan finishing positions in advance based on scan frequency and touch sensing cycles, before actual touch sensing data acquisition. This allows the system to pre-identify which positions will be affected by scan driving noise, enabling targeted compensation rather than reactive noise reduction.
Solution Approach 2:
The patent changes parameters by introducing compensation values based on scan finishing positions. The computing circuit adjusts touch sensing data using position-dependent compensation parameters, transforming the raw noisy data into corrected touch sensing results that account for scan driving interference patterns.
2Adaptability or versatility
If touch sensing operation is performed during display operation, then device functionality is improved, but touch sensing accuracy deteriorates due to noise
Solution Approach 1:
The patent applies segmentation by dividing the touch display panel into multiple scan finishing positions and processing touch sensing data according to their specific positions. Each position receives appropriate compensation based on its characteristics, allowing differentiated noise reduction strategies for different regions affected by scan driving.
Solution Approach 2:
The patent introduces compensation values as an intermediary element between raw touch sensing data and final touch sensing results. This intermediary layer filters out scan driving noise while preserving genuine touch information, enabling accurate touch sensing to occur concurrently with display operation.
3Device complexity
If scan driving and touch sensing share the same circuit, then device complexity is reduced, but noise interference increases affecting touch sensing
Solution Approach 1:
The patent applies self-service by having the computing circuit use the same shared circuit resources to both generate scan driving signals and process touch sensing data. The system serves itself by utilizing existing circuit infrastructure for dual purposes, reducing overall device complexity while implementing noise compensation through software/firmware algorithms.
Data Source
AI summary
A touch display device and an operating method for the touch display device are provided. The touch display device includes a touch display panel, a touch display driving circuit and a computing circuit. The touch display driving circuit drives the touch display panel to perform a display operation based on a scan frequency and to perform a touch sensing operation based on a plurality of touch sensing cycles. The computing circuit determines a plurality of scan finishing positions on the touch display panel in response to the scan frequency and the touch sensing cycles, receives a touch sensing data corresponding to the scan finishing positions, and compensates the touch sensing data based on a base value.