Touch Sensor Driving Lines Sharing Odd Even Electrodes
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Solution Overview
Problem
The increasing demand for display devices with touch input capabilities leads to larger sizes of touch pads and flexible films due to the need for more driving lines and I/O pins, resulting in higher costs.
Innovation Solution
A display device design that reduces the number of driving lines by using time-division multiplexing with odd and even electrodes in adjacent touch sensor areas, allowing multiple driving electrodes to share the same driving lines and reducing the overall size of touch pads and flexible films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensor layers are added to support touch input, then touch sensing capability is improved, but the size of flexible films and touch pads increases
Solution Approach 1:
The patent combines odd and even touch sensor areas into a single integrated touch sensing unit that shares common driving lines and sensing lines. By merging the electrode structures and signal pathways, the overall area required for flexible films and touch pads is reduced while maintaining full touch sensing functionality across both areas.
Solution Approach 2:
The patent implements a universal driving line structure that serves multiple functions: the same driving lines are used to drive electrodes in both odd and even touch sensor areas. Similarly, sensing lines are shared between areas. This multi-functional approach eliminates the need for separate dedicated lines for each area, reducing the overall size of flexible films and touch pads.
2Adaptability or versatility
If the number of driving lines is increased to cover more touch sensor areas, then touch coverage is improved, but the complexity and cost of the system increases
Solution Approach 1:
The patent merges the driving line structures for odd and even touch sensor areas by having them share common driving lines. The driving electrodes in both areas are connected to the same driving lines through appropriate switching mechanisms, reducing the total number of driving lines and I/O pins required while maintaining comprehensive touch coverage.
Solution Approach 2:
The patent employs periodic scanning of touch sensor areas using odd and even periods. During odd periods, odd touch sensor areas are scanned, and during even periods, even touch sensor areas are scanned. This time-division multiplexing approach allows a reduced set of driving lines to cover the entire touch area sequentially, reducing system complexity and cost.
Data Source
AI summary
A display device includes: a display unit including a plurality of pixels; and a touch sensing unit on a surface of the display unit, the touch sensing unit including first and second touch sensor areas adjacent to each other along a first direction, wherein the touch sensing unit comprises: a plurality of driving electrodes branched off from a plurality of driving lines, with the plurality of driving electrodes extending in a second direction intersecting the first direction, in each of the first and second touch sensor areas; a plurality of sensing electrodes extending in the first direction; a plurality of odd electrodes extending in the second direction in the first touch sensor area; and a plurality of even electrodes extending in the second direction in the second touch sensor area.