Transmitting Electrode Scan Driving Unit for In-Cell Touch Panels
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Solution Overview
Problem
In-cell touch screen panels face limitations in large size applications due to the increased number of transmitting (TX) electrodes requiring more space for fan-out lead wires, leading to potential cross-talk issues with gate driver circuits, which reduces reliability.
Innovation Solution
A transmitting electrode scan driving unit with a shift register and scan driving signal generation units, which reduces the need for fan-out lead wires by cascading shift register units and using AND gate and voltage conversion modules to generate scan driving signals, allowing for efficient signal transmission without extensive wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the number of TX electrodes is increased to support larger panel sizes, then the coverage area is improved, but the number of fan-out lead wires required increases, leading to more space consumption and potential cross-talk issues
Solution Approach 1:
The patent combines the TX electrode driving function with the GOA circuit by integrating scan signal generation directly into the array substrate. The shift register units and scan driving signal generation units are merged into a unified circuit structure that eliminates the need for separate fan-out lead wires, as the driving signals are generated locally within the GOA circuit itself.
Solution Approach 2:
The GOA circuit is designed to generate its own scan driving signals through integrated shift register units and scan driving signal generation units. This self-service mechanism eliminates the need for external ICs to provide TX driving signals through fan-out lead wires, as the circuit autonomously produces the required scan signals for TX electrode control.
2Area of stationary object
If fan-out lead wires are placed above or below the GOA circuit to reduce space consumption, then the area usage is improved, but signal cross-talk between TX electrodes and GOA circuit occurs, reducing reliability
Solution Approach 1:
The patent extracts the TX electrode driving function from external ICs and relocates it directly into the GOA circuit on the array substrate. By taking out the scan signal generation function and integrating it into the GOA circuit, the design eliminates the physical fan-out lead wires that caused cross-talk, as the driving signals are now generated at the source without requiring long external connections.
3Reliability
If external ICs are used to drive TX electrodes through fan-out lead wires, then the driving capability is ensured, but the bezel area required increases, limiting scalability
Solution Approach 1:
The patent transitions from a external IC-based driving architecture to an integrated on-substrate GOA circuit architecture. This dimensional change moves the driving function from outside the array substrate to within the substrate itself, eliminating the need for fan-out lead wires extending to external ICs and thereby reducing bezel area requirements while maintaining full driving capability.
Data Source
AI summary
A transmitting electrode scan driving unit is disclosed including a shift register unit having a start signal input terminal, a first clock signal input terminal and a scan signal output terminal, and a plurality of scan driving signal generation unit each having a second clock signal input terminal, a scan signal input terminal, a driving signal input terminal and a scan driving signal output terminal. The scan signal input terminal is connected with the scan signal output terminal of the shift register unit. Also disclosed are a driving circuit, a driving method, an array substrate and a display apparatus.