Capacitive In-Cell Touch Panel Dual Gate Structure
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Solution Overview
Problem
Current capacitive in-cell touch panels do not exist based on the dual gate structure, which could reduce the number of data signal lines and source driver ICs, thereby increasing the aperture ratio and reducing production costs.
Innovation Solution
A capacitive in-cell touch panel is developed with a dual gate structure, featuring two gate signal lines between adjacent rows of pixel units and shared data signal lines between columns, along with touch driving electrodes between pixel unit columns and touch sensing electrodes on the color filter substrate, allowing for efficient touch functionality without compromising display accuracy or aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional single gate structure is used in TFT array substrate, then the number of data signal lines and source driver ICs can be reduced, but the aperture ratio is limited and production cost is higher
Solution Approach 1:
The gate signal lines are segmented into two separate lines (Gate 1 and Gate 2) between adjacent rows of pixel units, allowing independent control of pixel rows. This segmentation enables the use of fewer data signal lines while maintaining display capabilities, thereby reducing the aperture ratio occupation and increasing the aperture ratio.
Solution Approach 2:
The gate signal lines are designed to serve dual purposes: they control the pixel rows for display functions and simultaneously provide touch sensing capabilities by acting as touch driving electrodes. This multi-functionality reduces the need for separate touch electrode structures, increasing the aperture ratio while maintaining touch functionality.
2Measurement precision
If touch driving electrodes are added to enable touch functionality, then touch accuracy is improved, but the aperture ratio decreases due to additional electrode structures
Solution Approach 1:
The gate signal lines are designed to serve dual purposes: they control the pixel rows for display functions and simultaneously provide touch sensing capabilities by acting as touch driving electrodes. This multi-functionality reduces the need for separate touch electrode structures, increasing the aperture ratio while maintaining touch functionality.
Solution Approach 2:
The display gate signal lines and touch driving electrodes are merged into a single structure. The same physical conductors that transmit gate signals to control pixel rows also function as driving electrodes for capacitive touch sensing, eliminating the need for separate touch electrode layers and thereby maximizing the aperture ratio.
3Ease of manufacture
If the number of data signal lines is reduced through dual gate structure, then production cost decreases, but touch functionality becomes more complex to implement
Solution Approach 1:
The gate signal lines are designed to serve dual purposes: they control the pixel rows for display functions and simultaneously provide touch sensing capabilities by acting as touch driving electrodes. This multi-functionality reduces the need for separate touch electrode structures, increasing the aperture ratio while maintaining touch functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances touch accuracy and maintains a high aperture ratio by doubling the number of gate signal lines, reducing the need for data signal lines, and integrating touch driving electrodes at saved positions, ensuring effective touch functionality without affecting display performance.
Implementation Method 1
the color filter substrate includes a plurality of touch sensing electrodes extended along a row direction of the pixel units
Data Source
AI summary
Embodiments of the present invention disclose a capacitive in-cell touch panel, a driving method thereof and a display device. Touch sensing electrodes extended along the row direction of pixel units are arranged on a color filter substrate; a thin-film transistor (TFT) array substrate adopts a dual gate structure, that is, two gate signal lines are disposed between every two adjacent rows of pixel units; every two adjacent columns of pixel units are taken as a group of pixel unit columns and share a data signal line disposed between the two pixel unit columns, so that the positions of a part of data signal lines can be saved; and touch driving electrodes for achieving the touch function are arranged at the saved positions of the data signal lines.