Touch Display Signal Charging Time Compensation
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Solution Overview
Problem
As the resolution of display panels increases, the accuracy and sensitivity of touch sensing in touch display devices deteriorate due to reduced charging time of touch signals, leading to decreased touch sensitivity and accuracy.
Innovation Solution
A touch device and method that simultaneously apply touch signals to multiple touch lines, duplicating signals during scanning to compensate for charging time and improve sensitivity, utilizing both self-capacitive and mutual capacitive types to calculate touch coordinates accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the display panel increases, then the resolution of the touch panel increases, but the charging time of the touch signal is reduced and touch sensitivity is deteriorated
Solution Approach 1:
The patent applies periodic action by scanning touch lines in a sequential manner rather than simultaneously. The controller scans X-touch lines and Y-touch lines in alternating periods, applying touch signals during specific time intervals. This periodic scanning approach allows sufficient charging time for each touch line while maintaining high touch frequency and resolution, thereby resolving the contradiction between high resolution and adequate charging time.
Solution Approach 2:
The patent segments the touch panel into multiple touch lines (X-touch lines and Y-touch lines) that are scanned sequentially. Instead of applying signals to all touch lines simultaneously, the system divides the scanning process into separate phases for different touch line groups. This segmentation enables extended charging time for each segment while maintaining overall system performance at high resolution.
2Productivity
If the touch frequency of the touch panel increases, then the resolution increases, but the charging time of the touch signal is reduced and touch sensitivity is deteriorated
Solution Approach 1:
The patent implements periodic action through sequential scanning of touch lines at high frequencies. The controller rapidly alternates between scanning different touch line groups, maintaining high touch frequency while ensuring each line receives sufficient charging time during its designated scan period. This periodic approach decouples the conflict between frequency and charging time.
Solution Approach 2:
The patent applies preliminary action by pre-charging touch lines before they are scanned for touch detection. The controller applies touch signals to touch lines in advance during their designated scan periods, ensuring they are fully charged before measurement. This preliminary charging action maintains adequate charging time even at high touch frequencies.
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
Enhances touch sensing accuracy and sensitivity by extending the charging time of touch signals, ensuring sufficient signal application during high touch frequencies and resolutions, thereby improving the overall performance of touch display devices.
Implementation Method 1
a touch panel including a plurality of X-touch lines and a plurality of Y-touch lines crossing each other; an X-touch driving part simultaneously transmitting at least two of a plurality of X-self signals to the plurality of X-touch lines and sequentially transmitting a plurality of X-mutual signals to the plurality of X-touch lines
Data Source
AI summary
A touch device includes: a touch panel including a plurality of X-touch lines and a plurality of Y-touch lines crossing each other; an X-touch driving part simultaneously transmitting at least two of a plurality of X-self signals to the plurality of X-touch lines and sequentially transmitting a plurality of X-mutual signals to the plurality of X-touch lines; and a Y-touch driving part simultaneously transmitting at least two of a plurality of Y-self signals to the plurality of Y-touch lines and transmitting at least two of a plurality of Y-mutual signals to the plurality of Y-touch lines.