In-cell Multi-touch Display Panel with Segmented Gate Lines
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Solution Overview
Problem
The increasing image resolution of display panels limits the ability to perform both image displaying and touch sensing within the required time frame, especially due to the need for maintaining a high display frame rate, and existing in-cell multi-touch technologies face challenges in cost-effectiveness and display quality due to the stacking of touch panels with flat displays.
Innovation Solution
An in-cell multi-touch display panel system that utilizes a common-voltage and touch-driving layer with a TFT layer and conductive electrode layer, where the K gate driving lines are divided into N groups corresponding to N second conduct lines, allowing concurrent display and touch detection without time sharing, thus saving cost and maintaining high display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the image resolution of display panels is increased, then the display quality is improved, but the time required for image displaying increases, limiting the ability to perform both image displaying and touch sensing within the required time frame
Solution Approach 1:
The patent segments the gate driving lines into multiple groups (first gate driving line group, second gate driving line group, etc.) that can be driven independently and concurrently. This segmentation allows the display panel to perform touch sensing operations on certain line groups while simultaneously performing image displaying on other line groups, thereby resolving the time conflict between high-resolution display and touch sensing.
Solution Approach 2:
The patent implements continuous useful action by enabling concurrent operations of image displaying and touch sensing through multiple gate driving line groups. While one group of lines is being used for image display, another group simultaneously performs touch sensing, ensuring that both functions continue without interruption and maximizing the utilization of the display panel's capabilities.
2Device complexity
If time sharing is used for display and touch sensing, then the hardware cost is reduced, but the display frame rate decreases and display quality deteriorates
Solution Approach 1:
The patent divides the gate driving lines into multiple independently controllable groups, allowing concurrent execution of display and touch sensing operations. This segmentation eliminates the need for time-sharing mechanisms while maintaining hardware simplicity, as the same physical hardware can operate in parallel modes rather than sequentially.
Solution Approach 2:
The patent introduces dynamic control mechanisms that allow the display panel to flexibly switch between different operating modes (image display, touch sensing, or concurrent operations) based on real-time requirements. This dynamic approach enables the system to maintain high frame rates while supporting both functions simultaneously, avoiding the performance degradation associated with static time-sharing arrangements.
3Device complexity
If the same transparent conductive layer is shared for both common voltage layer and touch sensor driving, then the hardware cost is reduced, but the ability to maintain high display frame rate while performing touch sensing is limited
Solution Approach 1:
The patent implements multi-functionality by designing the common voltage layer to serve dual purposes: as the common voltage layer for LCD operation and as the touch sensor driving layer for capacitive touch sensing. This universal design allows the same hardware structure to perform multiple functions simultaneously, reducing hardware costs while maintaining high display frame rates through concurrent operations enabled by segmented gate driving lines.
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 approach enables concurrent display and touch detection, maintaining high display quality and frame rates while reducing hardware costs by sharing the common voltage layer for both display and touch functions, overcoming the limitations of prior technologies in handling higher resolutions.
Implementation Method 1
a capacitive touch panel uses a capacitance change generated in an electrostatic combination of the arranged transparent electrodes with the touching part of a human body to generate a current or voltage for detecting the coordinate of the touching part
Implementation Method 2
a capacitance change generated in an electrostatic combination of the arranged transparent electrodes with the touching part of a human body
Data Source
AI summary
An in-cell multi-touch display panel system includes a touch LCD panel and a touch display control subsystem. The touch LCD panel has a TFT layer, a conductive electrode layer, and a common-voltage and touch-driving layer. The TFT layer has K gate driving lines and L source driving lines for a display operation. The conductive electrode layer has M first conduct lines for a touch detection operation by sampling a touch detection result from the M first conduct lines. The common-voltage and touch-driving layer has N second conduct lines for receiving a common voltage signal in display and receiving a touch-driving signal in touch detection. The K gate driving lines are divided into N groups respectively corresponding to the N second conduct line. When one group of gate driving lines has the display driving signal, the corresponding second conduct line is connected to the common voltage signal.