Touch Sensor Embedded Display Device Parallel Scanning Method
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Solution Overview
Problem
The existing in-cell touch sensor technology faces challenges in increasing touch sensitivity without compromising the display quality of input images, as it struggles to implement fast touch input responses due to the time-divided frame period approach, which reduces the display period and affects image quality.
Innovation Solution
A touch sensor embedded display device and method that performs a display scan of one display line in a display period and simultaneously conducts touch scans of overlapping touch lines in a touch period, allowing for increased touch report rates without reducing display quality by using a double feeding method to minimize signal distortion and parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch period length is increased to increase the touch report rate, then the touch sensitivity is improved, but the display period length is reduced leading to reduced display quality
Solution Approach 1:
The patent segments the touch scan operation into multiple independent touch lines that can be scanned simultaneously. Instead of scanning all touch lines sequentially in one period, the touch scan is divided into multiple parallel operations across different touch lines, allowing the touch report rate to be effectively doubled without extending the overall touch period duration.
Solution Approach 2:
The patent implements periodic touch scanning at doubled frequency by alternating between different touch line groups in successive periods. The touch period is structured to scan even-numbered touch lines in one period and odd-numbered touch lines in the next period, creating a periodic pattern that achieves doubled touch report rate while maintaining the original period length.
2Speed
If the touch report rate is increased to improve touch input response speed, then the touch input trace representation is improved, but the display period is reduced affecting image quality
Solution Approach 1:
The display scan is segmented to operate independently on display lines while the touch scan operates independently on touch lines. This segmentation allows the touch scanning operations to be performed in parallel with display scanning, effectively doubling the touch report rate without encroaching on the display period time allocation.
Solution Approach 2:
The patent merges the display scan and touch scan operations into a unified time-division framework where both operations coexist within the same frame period. By carefully coordinating the timing and using the double feeding method, both display and touch functions are maintained at their required performance levels simultaneously.
3Device complexity
If sequential touch line scanning is used to simplify the scanning process, then the device complexity is reduced, but the touch report rate is limited
Solution Approach 1:
The touch lines are segmented into multiple groups that can be scanned independently and simultaneously. This segmentation enables parallel processing of touch data across multiple lines, dramatically increasing the touch report rate. The segmentation is managed through systematic indexing and timing control rather than complex hardware.
Solution Approach 2:
The patent implements dynamic scanning patterns where the touch scanner can adaptively switch between different scanning modes. The scanning process dynamically adjusts which touch lines are scanned in each period based on a systematic pattern, allowing flexible and efficient utilization of the scanning resources to achieve doubled report rates.
Data Source
AI summary
Provided are a touch sensor embedded display device and a method for driving the same. A method includes: sequentially, in the display period: performing a display scan of a first area of the display panel based on one display line; and applying data of an input image to the pixels of the first area; simultaneously performing: a touch scan of a first touch line of the display panel and a touch scan of a second touch line of the display panel in a touch period following the display period; and simultaneously sensing touch inputs of the touch sensors on the first and second touch lines in the touch period, wherein each of the first and second touch lines overlaps a plurality of display lines, and wherein a width of each of the first and second touch lines is greater than a width of each of the plurality of display lines.