Array Substrate Touch Driving Circuit Simplification
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Solution Overview
Problem
Existing mutual-capacitive touch display screens have complex touch driving circuits with numerous components, occupying large space, which hinders the design of narrow edge frames due to the need for multiple shifting and driving modules.
Innovation Solution
The touch driving circuit is simplified by grouping data lines and using switch units to connect touch electrodes directly with a common signal line and data lines, reducing the number of elements and circuit complexity, allowing for a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional touch driving circuit with shifting module and driving module is used, then the touch electrodes can be driven, but the circuit structure becomes complex and occupies large area
Solution Approach 1:
The patent combines the shifting module and driving module into a single integrated touch driving circuit. The gate electrode of each touch electrode is directly connected to a data line, eliminating the need for separate shifting and driving modules. This integration reduces the number of components and simplifies the overall circuit structure while maintaining the ability to sequentially drive multiple touch electrodes.
Solution Approach 2:
The data lines serve dual functions: they transmit display data to pixel electrodes during the display period and transmit touch driving signals to touch electrode gates during the touch detection period. This multi-functionality eliminates the need for dedicated shifting and driving modules, reducing circuit complexity and occupied area.
2Reliability
If a traditional touch driving circuit with multiple modules is used, then the touch electrodes can be driven, but the occupied panel area increases
Solution Approach 1:
The patent merges the shifting and driving functions into a single compact circuit structure where the gate electrode of each touch electrode is directly connected to a data line. This eliminates the need for separate shifting modules with multiple transistor levels and driving modules with NAND gates and inverters, significantly reducing the occupied panel area.
Solution Approach 2:
Data lines are designed to serve both display and touch driving functions. During the display period, they transmit display data; during the touch detection period, they transmit touch driving signals. This multi-functionality reduces the need for dedicated touch driving circuitry, minimizing the occupied area.
3Device complexity
If data lines are grouped and switch units are used to connect touch electrodes directly, then the circuit complexity is reduced, but the switching control must be precisely managed
Solution Approach 1:
The touch driving circuit operates in periodic cycles, alternating between display periods and touch detection periods. During each touch detection period, the switching units are controlled to connect specific data lines to specific touch electrode gates in a predetermined sequence. This periodic operation simplifies the control logic compared to continuous complex switching, as the switching pattern repeats regularly and can be managed through timing signals.
Data Source
AI summary
The present disclosure provides an array substrate, a method for driving the array substrate, a display panel, and a display device. The array substrate includes a plurality of data lines, a plurality of touch electrodes, and a touch driving circuit, the plurality of data lines are divided into a plurality of data line groups, and each of the data line groups corresponds respectively to one of the respective touch electrodes; the touch driving circuit includes a common signal line, a first switch unit, and a second switch unit. The first switch unit and the second switch unit are electrically connected with the touch electrodes. When the data line groups are electrically connected with the touch electrodes, at least one data line in each of the data line groups is provided with a touch detecting signal.