In-cell Touch Screen Parallel Electrode Driving
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Solution Overview
Problem
Conventional in-cell touch screens face limitations in achieving high definition displays and improved touch functionality due to time division driving methods, which reduce the frequency of touch signal scanning and interfere with display and touch functions.
Innovation Solution
The in-cell touch screen employs a division driving mode where display and touch signals are input simultaneously to multiple rows of electrodes during a frame period, ensuring adequate time for both display and touch operations, allowing for increased touch signal scanning frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time division driving method is used to prevent interference between display and touch functions, then interference between functions is prevented, but the time period for both touch and display operations is significantly reduced
Solution Approach 1:
The patent segments the electrode layer into multiple independent electrode rows, allowing different rows to perform different functions simultaneously. This segmentation enables parallel operation of touch and display functions without time division, resolving the contradiction by eliminating the need to reduce time period while preventing interference through spatial separation.
Solution Approach 2:
The patent transitions from time-based multiplexing (one dimension) to space-based parallel processing (another dimension). By arranging electrodes in multiple rows that can be independently controlled, the system achieves both functions simultaneously in the spatial domain, thereby increasing the time period available for each function while preventing interference.
2Reliability
If time division driving method is used, then display and touch functions operate independently, but the frequency for scanning touch signals cannot be raised
Solution Approach 1:
By segmenting the electrode layer into multiple independently controllable rows, the patent enables parallel scanning of touch signals across different rows. This allows the scanning frequency to be increased without compromising function independence, as each row can be scanned at high frequency while other rows perform display functions.
Solution Approach 2:
The patent enables continuous touch signal scanning across multiple rows simultaneously, eliminating the interruptions inherent in time division driving. This continuous action allows for higher scanning frequencies while maintaining function independence through spatial separation of operations.
3Reliability
If time division driving method is used, then interference is prevented, but both touch function and display function deteriorate
Solution Approach 1:
The patent segments the electrode layer into multiple independent rows that can operate in parallel. This segmentation allows both touch and display functions to operate simultaneously at full performance levels without interference, resolving the contradiction by enabling high productivity while maintaining reliability through spatial separation.
Solution Approach 2:
The patent moves from sequential time-based operation to parallel space-based operation. This dimensional change allows both functions to achieve high performance simultaneously while preventing interference, thereby improving overall productivity without sacrificing reliability.
Data Source
AI summary
The present disclosure relates to a field of displaying technology, and describes an in-cell touch screen and a method for driving the same. The in-cell touch screen comprises: a substrate; an electrode layer, formed on the substrate; and a touch driving module, wherein multiple rows of electrodes are formed on the electrode layer, and each row of electrodes is configured to drive at least one row of pixel units; the touch driving module comprises a plurality of signal lines corresponding to electrodes in one-to-one correspondence; and during a time period for displaying an image, when the image is to be displayed by the pixel units corresponding to a row of electrodes, the touch driving module is configured to input display driving signals to the row of electrodes and input touch driving signals to the other rows of electrodes simultaneously.