Touch Display Device Parasitic Capacitance Reduction
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Solution Overview
Problem
Touch display devices face performance deterioration due to parasitic capacitance between display driving electrodes and touch sensing electrodes, which is influenced by the arrangement of touch electrodes and routing lines, leading to noise and reduced sensing accuracy.
Innovation Solution
A touch display device design that includes a plurality of light emitting elements with encapsulation, touch electrode lines in an active area, and touch routing lines in a non-active area, where the touch electrode lines are separated into portions and connected in a way that minimizes parasitic capacitance by shortening the touch routing lines to a predetermined length, enhancing touch sensing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch routing lines are extended to connect touch electrode lines, then electrical connection is achieved, but parasitic capacitance increases causing noise and reduced sensing accuracy
Solution Approach 1:
The touch routing lines are divided into multiple segments with different connections. Specifically, first routing lines connect to first portions of touch electrode lines, while second routing lines connect to second portions. This segmentation allows optimization of each routing line's path to minimize overall parasitic capacitance while maintaining electrical connectivity.
Solution Approach 2:
The patent utilizes the non-active area (border region) as an additional spatial dimension to route the routing lines. By extending routing lines into this unused border region rather than confining them to the active display area, the routing paths can be optimized to minimize parasitic capacitance without interfering with the display function.
2Adaptability or versatility
If touch electrode lines are arranged in active area, then touch sensing function is provided, but parasitic capacitance with display driving electrodes increases
Solution Approach 1:
The patent extracts the routing lines from the active display area and places them in the non-active border region. This separation removes the source of parasitic capacitance (the routing lines) from the sensitive active area where touch electrode lines are located, thereby reducing noise while maintaining touch sensing functionality.
Solution Approach 2:
The non-active border region serves as an intermediary space that mediates between the touch electrode lines in the active area and the routing requirements. This intermediate region allows routing lines to be positioned away from sensitive areas, reducing parasitic capacitance while still providing necessary electrical connections.
3Object-affected harmful factors
If routing lines are placed in non-active area, then parasitic capacitance is reduced, but routing line length increases
Solution Approach 1:
The patent applies different routing strategies to different portions of touch electrode lines. First routing lines connect to first portions while second routing lines connect to second portions, allowing each routing line to be optimized locally for minimum length while collectively achieving reduced parasitic capacitance through their distributed arrangement in the non-active area.
Data Source
AI summary
Embodiments of the disclosure relate to touch display devices. The difference in parasitic capacitance due to the difference in length between the touch routing lines may be reduced by separately arranging touch electrode lines in the active area and connecting the touch routing line connected with each portion of a touch electrode line with the touch routing line connected with each portion of another touch electrode line. Therefore, it is possible to reduce loads and the differences in touch sensing depending on the connection structure and position of the touch routing line by driving the touch electrode line in a double-routing structure. By so doing, the performance of touch sensing may be enhanced.