Touch Display Device Signal Timing Segmentation
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Solution Overview
Problem
Touch display devices face challenges in achieving high display quality while maintaining accurate touch detection.
Innovation Solution
The touch display device employs a scan driver to output scan signals in alternating display scan periods and a data driver to output display and touch data signals during specific touch scan periods, with touch data signals having distinct voltage levels to improve both display and touch functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch data signals are transmitted during display scan periods, then touch detection can be performed, but display quality and accuracy of touch detection deteriorate due to signal interference
Solution Approach 1:
The patent segments the frame period into distinct display scan periods and touch scan periods. During display scan periods, display data signals are transmitted to scan lines. During dedicated touch scan periods, touch data signals are transmitted instead. This temporal segmentation prevents signal interference between display and touch functions, thereby maintaining both display quality and touch detection accuracy simultaneously.
2Device complexity
If touch data signals share data lines with display data signals, then device complexity is reduced, but signal interference occurs affecting both display quality and touch detection accuracy
Solution Approach 1:
The patent implements periodic action by alternating between display data signal transmission and touch data signal transmission on the same data lines. Each frame period contains designated display scan periods for display signals and touch scan periods for touch signals. This periodic switching ensures that only one type of signal occupies the data lines at any given time, eliminating signal interference while maintaining device simplicity.
Data Source
AI summary
A touch display device includes a plurality of scan lines including first portion scan lines and second portion scan lines; a plurality of data lines crossing the plurality of scan lines; a scan driver outputs a plurality of first portion scan signals to the first portion scan lines in a first display scan period in a frame, a plurality of second portion scan signals to the second portion scan lines in a second display scan period in the frame; and a data driver outputs a plurality of first portion display signals corresponding to the plurality of first portion scan signals in the first display scan period; a plurality of second portion display signals corresponding to the plurality of second portion scan signals in the second display scan period.