Touch Display Pseudo Signal Layout for EMI-Stable Sensing
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Solution Overview
Problem
Touch display devices experience malfunctions and degraded image quality due to electromagnetic noise generated by signal lines, which affect touch sensing operations.
Innovation Solution
The implementation of pseudo gate clock and pseudo touch lines in the non-display area of the display panel, along with a pseudo signal control circuit, to manage and reduce electromagnetic noise by supplying pseudo gate signals during touch processing periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal lines are used to transmit various signals in the touch display device, then signal transmission function is achieved, but electromagnetic noise is generated which causes malfunctions in touch sensing operation and degrades image quality
Solution Approach 1:
The patent introduces pseudo signal lines as intermediary elements that carry pseudo signals to counterbalance electromagnetic noise generated by actual signal lines. These pseudo signal lines act as mediators that create compensating electromagnetic fields to cancel out the harmful noise, thereby protecting touch sensing operations without disrupting the functionality of the original signal transmission lines.
Solution Approach 2:
The patent converts the harmful electromagnetic noise generated by signal lines into a beneficial effect by introducing pseudo signals that generate counteracting electromagnetic fields. The noise that would normally degrade image quality and cause touch sensing malfunctions is transformed into a balancing force that improves overall system reliability when properly managed through the pseudo signal transmission mechanism.
2Reliability
If pseudo signal lines are added to reduce electromagnetic noise, then touch sensing reliability is improved, but device structure becomes more complex
Solution Approach 1:
The patent merges the functionality of noise reduction with the existing signal transmission infrastructure by integrating pseudo signal lines alongside the original signal lines. Rather than creating a completely separate noise cancellation system, the approach combines noise reduction functionality with the existing line structure, allowing both actual signals and pseudo signals to coexist and work together within a unified transmission framework.
Solution Approach 2:
The pseudo signal lines serve multiple functions: they generate electromagnetic fields to counterbalance noise, maintain structural symmetry with actual signal lines, and can be routed through existing non-display areas. This multi-functionality reduces the need for additional dedicated noise cancellation components, thereby limiting the increase in device complexity while achieving reliable touch sensing operation.
3Loss of energy
If pseudo gate clock and pseudo touch lines are formed in non-display area, then electromagnetic noise is reduced and power consumption is lowered, but manufacturing process becomes more complex
Solution Approach 1:
The patent implements preliminary action by forming pseudo signal lines in the non-display area during the manufacturing process, before the device is fully assembled and operational. This allows the noise-reducing structure to be pre-configured and integrated into the display panel fabrication process, ensuring that the electromagnetic noise cancellation capability is built-in from the start rather than requiring post-manufacturing modifications or additional assembly steps.
Solution Approach 2:
The patent applies local quality by confining the pseudo signal lines specifically to the non-display area, where they perform noise reduction functions without interfering with the display functionality. This localized approach allows the manufacturing process to handle different regions of the display panel with different requirements, simplifying the overall manufacturing by focusing the complex pseudo signal line integration only where it is needed for noise cancellation, rather than throughout the entire device.
Data Source
AI summary
A touch display device, comprising a display panel in which a plurality of subpixels are disposed in a display area, and a first pseudo signal line and a second pseudo signal line are disposed in a non-display area, a gate driving circuit configured to supply gate signals to the display panel using a plurality of gate clocks, a touch circuit configured to supply a plurality of touch driving signals to touch electrodes disposed on the display panel and detect touch coordinates by receiving touch sensing signals, a timing controller configured to control the gate driving circuit and the touch circuit, and a pseudo signal control circuit configured to control paths of a first pseudo signal and a second pseudo signal supplied to the first pseudo signal line and the second pseudo signal line.