Touch Display Panel Electrode Grouping for Reduced Scan Time
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Solution Overview
Problem
Capacitive touch panels face limitations in size due to the need for a longer time to scan multiple channels, which interferes with display signals and restricts the panel's size, as the time required for touch control is directly proportional to the number of channels.
Innovation Solution
The design includes a substrate with first touch electrodes and second touch sub-electrodes that are insulated and intersecting, with at least two first touch electrodes connected as a group and each second touch electrode unit having multiple sub-electrodes connected through different wires, allowing for reduced scan channels and shorter scan times by grouping and connecting electrodes efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of scan channels is increased to support larger touch panels, then the touch control capability is improved, but the scan time increases and interferes with display signals
Solution Approach 1:
The patent segments the touch electrode scan channels into multiple groups that can be scanned in parallel. Specifically, it divides the drive electrodes into multiple groups, each group being scanned by a separate scan channel, allowing simultaneous scanning of multiple groups. This segmentation enables the touch panel to support larger areas without proportionally increasing the total scan time, as multiple segments are processed concurrently rather than sequentially.
2Productivity
If the scan time is reduced to minimize interference with display signals, then the display performance is improved, but the number of supported channels is limited
Solution Approach 1:
The patent implements dynamic scan channel allocation where the number and configuration of scan channels can be adjusted based on the touch panel size and requirements. The system dynamically assigns multiple scan channels to different electrode groups, allowing the display controller to adaptively manage the scanning process. This dynamic approach enables efficient use of scan time while supporting a flexible number of channels, resolving the contradiction between display efficiency and channel adaptability.
Data Source
AI summary
A touch display panel is disclosed. The touch display panel includes first touch electrodes and second touch sub-electrodes. The first touch electrodes are insulated from and intersect with the second touch sub-electrodes. At least two of the first touch electrodes are connected as at least one first touch electrode group, where each first touch electrode group is connected with a touch drive detection unit through a wire. In addition, second touch sub-electrodes corresponding to each of the first touch electrode groups form a second touch electrode group. Each second touch electrode group includes second touch electrode units, each including at least two second touch sub-electrodes. Each of the second touch sub-electrodes is connected with the touch drive detection unit through a different wire. Additionally, the touch drive detection unit transmits a touch drive signal to or receives a detection signal from the first touch electrodes or the second touch sub-electrodes.