Touch Display Module Compensation Routing for Active Pen Accuracy
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Solution Overview
Problem
The touch accuracy of touch display devices is adversely affected due to differences in capacitances between touch lines extending from different sides, which impacts the performance of active pens, particularly in high-end tablets and laptops.
Innovation Solution
A touch display module with a first compensation line arranged parallel to the second sub-touch lines to equalize capacitances and reduce noise intensity, coupled to the touch IC via flexible circuit boards, enhancing touch accuracy and pen performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If touch lines extend from two opposite sides to increase coverage, then the touch panel area is improved, but capacitance uniformity deteriorates
Solution Approach 1:
The patent applies asymmetry by configuring different routing paths for touch lines from opposite sides. Specifically, touch lines from the first side are routed through a first flexible circuit board while touch lines from the second side are routed through a second flexible circuit board, creating asymmetric compensation structures that balance the overall capacitance distribution across the touch panel.
Solution Approach 2:
The patent changes physical parameters by introducing compensation lines with specific capacitance values on the flexible circuit boards. These compensation lines are designed with controlled lengths and positions to adjust the total capacitance of each touch line, transforming the capacitance parameter to achieve uniformity across all touch lines regardless of their origin side.
2Area of stationary object
If multiple flexible circuit boards are used to connect touch lines, then touch line coverage is improved, but device complexity increases
Solution Approach 1:
The patent segments the connection structure by dividing the flexible circuit board into multiple independent sections, each handling specific touch lines from particular regions. This segmentation allows for modular design and assembly, where each segment can be independently optimized and connected to the touch panel, reducing overall system complexity despite increased coverage.
Solution Approach 2:
The flexible circuit boards serve as intermediary elements between the touch panel and the driver circuitry. These intermediaries provide a flexible connection medium that can accommodate the routing of multiple touch lines while maintaining electrical connections, thus enabling extended coverage without proportionally increasing the complexity of rigid circuit board structures.
Data Source
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AI summary
The present disclosure provides a touch display module, including: a touch panel, a first binding region and a second binding region being arranged at two opposite ends of the touch panel, the touch panel including a plurality of first touch lines and a plurality of second touch lines, ones of the plurality of first touch lines and the plurality of second touch lines including a plurality of first sub-touch lines extending to the first binding region and a plurality of second sub-touch lines extending to the second binding region; a touch driving circuit board, a touch IC and a plurality of first leads being arranged on the touch driving circuit board; a first flexible circuit board, a plurality of second leads being arranged on the first flexible circuit board, a first compensation line being arranged at a side where the plurality of second leads is located, the first compensation line and the second leads being arranged side by side, one end of the first compensation line being coupled to a corresponding first sub-touch line via the touch driving circuit board; and a second flexible circuit board, a third lead being arranged on the second flexible circuit board, each first sub-touch line being coupled to the touch IC via the third lead and the corresponding first lead on the touch driving circuit board. The present disclosure further provides a touch display device.