Touch Detection Method Using Grouped Sensing Pads
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Solution Overview
Problem
Conventional touch display panels face high touch detection latency due to the need for precise scanning of all sensing pads, which increases power consumption and delays in identifying touch events.
Innovation Solution
The touch detection method divides sensing pads into groups and columns, allowing for a doze mode with reduced power consumption and rapid switching to active mode for precise touch position identification by scanning specific groups and columns, thereby reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing pads are scanned column-by-column to identify precise touch position, then touch detection precision is improved, but touch detection latency increases
Solution Approach 1:
The sensing pad array is segmented into multiple groups, where each group contains multiple columns. The scanning process is divided into two phases: first scanning groups to identify which group contains a touch event, then scanning only the columns within that identified group to determine the precise touch position. This segmentation allows the system to balance between quick touch detection and precise position identification.
2Reliability
If all sensing pads are scanned to ensure complete touch detection, then touch detection reliability is improved, but power consumption increases
Solution Approach 1:
The sensing pad array is segmented into multiple groups, where each group contains multiple columns. The scanning process is divided into two phases: first scanning groups to identify which group contains a touch event, then scanning only the columns within that identified group to determine the precise touch position. This segmentation allows the system to balance between quick touch detection and precise position identification.
3Use of energy by moving object
If sensing pads are scanned group-by-group to reduce power consumption, then power efficiency is improved, but touch detection speed decreases
Solution Approach 1:
The system performs a preliminary group-level scanning phase before the detailed column-level scanning. During this preliminary phase, the system quickly identifies which group contains a touch event without scanning all columns. This preliminary action reduces the overall scanning time and power consumption while maintaining the ability to detect touches accurately.
4Reliability
If conventional scanning methods are used, then complete touch coverage is ensured, but response time increases
Solution Approach 1:
The sensing pad array is segmented into multiple groups, where each group contains multiple columns. The scanning process is divided into two phases: first scanning groups to identify which group contains a touch event, then scanning only the columns within that identified group to determine the precise touch position. This segmentation allows the system to balance between quick touch detection and precise position identification.
Solution Approach 2:
The system performs a preliminary group-level scanning phase before the detailed column-level scanning. During this preliminary phase, the system quickly identifies which group contains a touch event without scanning all columns. This preliminary action reduces the overall scanning time and power consumption while maintaining the ability to detect touches accurately.
Data Source
AI summary
A touch detection method, suitable for a touch display panel including multiple sensing pads, is disclosed. The sensing pads are divided into groups and each of the groups includes at least two columns of the sensing pads. The touch detection method includes following steps. In a first mode, the sensing pads are scanned group-by-group for detecting whether a touch event occurs on a touch identified group. In a second mode, the sensing pads are scanned column-by-column to identify a touch position of the touch event.