Touch Display Substrate Signal Line Sharing for Narrow Borders
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Solution Overview
Problem
Current touch display substrates with integrated touch and display driver (TTDI) technology face challenges such as low process yield, large module thickness, and inability to implement narrow borders due to a 1:1 ratio of touch signal lines to touch electrodes, leading to a large-sized touch IC that is not conducive to narrow-border designs.
Innovation Solution
A touch display substrate design that includes signal transmission circuits connected to multiple touch electrodes, allowing at least two signal transmission circuits to share the same touch signal line, with independent control via different control lines, reducing the number of touch signal lines and enabling a narrow-border design by facilitating time-division driving of touch electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a 1:1 ratio of touch signal lines to touch electrodes is used, then each touch electrode can be independently controlled, but the number of touch signal lines increases leading to large module thickness and inability to implement narrow borders
Solution Approach 1:
The patent merges multiple touch electrode control functions into a single touch signal line by using a touch signal line sharing circuit. This circuit allows one touch signal line to sequentially control multiple touch electrodes (e.g., first touch electrode and second touch electrode) through time-division multiplexing, thereby reducing the total number of touch signal lines required and enabling narrower module thickness
Solution Approach 2:
The patent introduces dynamic control mechanisms where the touch signal line sharing circuit can dynamically switch between different touch electrodes based on control signals. The circuit dynamically adjusts which touch electrode is connected to the shared touch signal line at any given time, enabling flexible and independent control of multiple electrodes while using fewer physical signal lines
2Ease of operation
If a 1:1 ratio of touch signal lines to touch electrodes is used, then each touch electrode can be independently controlled, but the number of touch signal lines increases leading to large-sized touch IC not conducive to narrow-border designs
Solution Approach 1:
The patent combines multiple electrode control functions into a single touch signal line through the touch signal line sharing circuit. This merging approach reduces the number of signal lines from the touch IC, thereby reducing the touch IC size and enabling narrow-border display designs while maintaining independent control capability for each touch electrode through sequential activation
3Quantity of substance
If multiple signal transmission circuits share the same touch signal line, then the number of touch signal lines is reduced, but control complexity increases requiring independent control lines for each circuit
Solution Approach 1:
The patent segments the control function by introducing separate control lines (first control line and second control line) for each signal transmission circuit. This segmentation allows independent control of each circuit's operation timing, enabling the circuits to share a common touch signal line without interference while maintaining simple and clear control logic for each individual circuit
4Quantity of substance
If at least two signal transmission circuits are connected to the same touch signal line, then the number of touch signal lines is reduced, but the process yield decreases
Solution Approach 1:
The patent uses dynamic control signals to manage the operation of multiple signal transmission circuits sharing a common touch signal line. By dynamically activating only one circuit at a time through controlled signal timing, the system avoids signal conflicts and interference that would degrade process yield, while still achieving the benefit of reduced signal line count through the sharing architecture
Data Source
AI summary
Provided is a touch display substrate. The touch display substrate includes a base substrate, including a display region and a non-display region; a plurality of touch electrodes disposed in the display region; and a plurality of signal transmission circuits, a plurality of first control lines, a plurality of second control lines, a target signal line, and a plurality of touch signal lines that are disposed in the non-display region.