Gate Driver Interlacing for Integrated Touch Display
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Solution Overview
Problem
Display devices with integrated in-cell type touch screens face image quality degradation due to suboptimal gate-on time, which is reduced during interlacing operations, affecting touch report rates and overall display performance.
Innovation Solution
The implementation of a display device with a panel operating in multiple periods, where a gate driver applies a gate-on voltage to odd- and even-numbered gate lines during alternating horizontal periods, increasing the gate-on time and optimizing data voltage output, thereby enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an interlacing method is used to divide the display operation period for increasing touch report rate, then the touch report rate is improved, but the gate-on time is reduced causing degradation in image quality
Solution Approach 1:
The gate driver divides gate lines into odd-numbered and even-numbered groups, sequentially applying gate-on voltage to each group during alternating horizontal periods. This segmentation allows the display operation period to be divided into first and second display operation periods, enabling interlacing operation that increases touch report rate while maintaining adequate gate-on time for each segment
Solution Approach 2:
The gate driver implements periodic action by alternating between applying gate-on voltage to odd-numbered gate lines and even-numbered gate lines across multiple horizontal periods. This periodic switching pattern ensures that each gate line receives sufficient gate-on time while maintaining the interlacing structure needed for high touch report rate
2Manufacturing precision
If the gate-on time is increased to improve image quality, then the quality of displayed image is improved, but the touch report rate may be reduced
Solution Approach 1:
The invention transitions from a single sequential scanning approach to a two-dimensional interlacing approach, where odd and even gate lines are scanned in alternating horizontal periods. This dimensional change allows simultaneous optimization of both gate-on time (vertical dimension) and touch report rate (horizontal dimension) by utilizing the additional time dimension created by interlacing
Data Source
AI summary
A display device with an integrated touch screen and a method of driving the same are provided. The display device includes a panel configured to operate in a first display operation period, a first touch operation period, a second display operation period, and a second touch operation period, and include a touch electrode overlapping a plurality of gate lines and a plurality of data lines, and a gate driver configured to sequentially apply a gate-on voltage to an odd-numbered gate line among the plurality of gate lines during two horizontal periods in the first display operation period, and in the second display operation period, sequentially apply the gate-on voltage to an even-numbered gate line among the plurality of gate lines during two horizontal periods.