Array Substrate Discrete Pads for Touch Display Thickness Reduction
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Solution Overview
Problem
Touch display screens have a thickened structure due to intersecting wires and require a large bezel for control chips and touch electrode signal selection circuits, increasing the device's thickness and bezel width.
Innovation Solution
The array substrate design includes discrete pads in the non-display area that supply both data and touch signals to data lines and touch electrodes, respectively, using time division multiplexing to reduce the number of pads and eliminate the need for additional functional circuits, thereby minimizing the thickness and bezel width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate wires and circuits are used for data transmission and touch signal transmission, then the functions are reliable and independent, but the display screen thickness increases due to wire intersections and the bezel width increases due to large space requirements for control circuits
Solution Approach 1:
The patent combines data transmission and touch signal transmission into a single wire structure. The same physical wire carries both data signals during display phase and touch signals during touch phase, eliminating the need for separate wires and reducing screen thickness while maintaining functional independence through time-division multiplexing control
Solution Approach 2:
The patent makes the data wire serve multiple functions by enabling it to transmit both data signals and touch signals. The wire structure is designed to be universal, handling different signal types at different times, thereby reducing the number of dedicated components and minimizing bezel width
2Reliability
If separate wires and circuits are used for data transmission and touch signal transmission, then the functions are reliable and independent, but the bezel width increases due to large space requirements for control circuits
Solution Approach 1:
The patent merges the data transmission circuit and touch signal control circuit into a shared circuit structure. The same circuit components handle both data and touch functions by switching between modes, eliminating the need for separate large-area control circuits and reducing bezel width
Solution Approach 2:
The control circuit is designed with universal functionality to handle both data transmission and touch signal processing. By making the circuit multi-functional through time-division operation, the patent reduces the space required for control circuits, thereby minimizing bezel width
3Reliability
If a control chip with dedicated touch signal control pin and large-volume touch electrode signal selection circuit are used, then the touch function is reliable, but the number of pins increases and the bezel width increases
Solution Approach 1:
The control chip is designed with universal pins that can serve both data transmission and touch signal control functions. The same pin outputs data signals during display phase and touch control signals during touch phase, eliminating the need for dedicated touch signal pins and reducing the total pin count while maintaining touch function reliability
Solution Approach 2:
The control chip operates in periodic phases, switching between display mode and touch mode. During display phase, pins transmit data signals; during touch phase, the same pins transmit touch control signals. This periodic operation allows pin sharing without compromising the reliability of either function
Data Source
AI summary
An array substrate, a display panel and a display device are provided. The array substrate includes a display area and a non-display area surrounding the display area. The display area includes a plurality of data lines and a plurality of first touch electrodes. A plurality of data signal lines and a plurality of discrete pads are provided in a first non-display area at a side of the display area. Each data signal line is connected to at least one data line, each pad is electrically connected to a respective data signal line, and at least one pad is electrically connected to a respective first touch electrode. The pads are configured to supply a data signal to the data lines in a display phase and to supply a touch signal to the first touch electrodes in a touch phase.