TFT Array Substrate Shielding Layer for EMI Reduction
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Solution Overview
Problem
Conventional liquid crystal display panels face significant stability and reliability issues due to electromagnetic interference (EMI) from signal lines, which can cause image distortion, color shift, or a blank screen, especially in electronic devices like cellphones, where EMI can degrade radio frequency sensitivity.
Innovation Solution
A TFT array substrate with a peripheral area that includes a shielding layer covering the signal lines to shield the display area from EMI, using an electric potential to enhance the shielding effect without increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a closed grounding line is provided within the peripheral area to shield environmental electromagnetic interference, then shielding effect is improved, but power consumption increases and signal line interference is not effectively eliminated
Solution Approach 1:
The patent extracts the shielding function from the traditional closed grounding line structure and relocates it to the signal line area. By providing a shielding layer specifically above the signal line that transmits EMI to the display area, the shielding function is separated from the peripheral grounding structure, achieving targeted protection without the need for extensive closed grounding lines throughout the peripheral area.
Solution Approach 2:
The patent applies local quality by concentrating the shielding function specifically in the signal line area where EMI transmission occurs, rather than uniformly distributing shielding throughout the entire peripheral area. The shielding layer is positioned above the signal line to locally address the EMI issue at its source, reducing overall material usage and power consumption while maintaining effective shielding where needed.
2Adaptability or versatility
If signal lines are provided in the peripheral area for IC connection, then device functionality is improved, but electromagnetic interference to the display area is caused
Solution Approach 1:
The patent introduces a shielding layer as an intermediary element positioned between the signal line and the display area. This shielding layer acts as a mediator that allows the signal line to perform its communication function while simultaneously blocking the transmission of EMI to the display area, thus resolving the conflict between functionality and interference prevention.
Solution Approach 2:
The patent segments the peripheral area into distinct functional zones: a signal line area where EMI is generated and a display area where EMI must be prevented. By spatially separating these zones and placing the shielding layer at the boundary, the patent allows each zone to perform its intended function without interfering with the other.
3Object-affected harmful factors
If conventional shielding structures are used, then EMI shielding is provided, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent employs a shielding layer constructed from thin film materials deposited on the substrate, rather than using bulky three-dimensional shielding structures. This thin film approach provides effective EMI shielding while maintaining device simplicity, reducing manufacturing complexity, and avoiding the need for complex assembly processes associated with traditional shielding enclosures.
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
The shielding layer effectively reduces EMI, improving the stability and reliability of the display panel and electronic devices, such as cellphones, by minimizing interference and maintaining communication signal sensitivity.
Implementation Method 1
the shielding layer covers the signal line to shield the display area against EMI caused by a signal outputted by the signal line
Data Source
AI summary
A TFT array substrate, a display panel and a display device are disclosed. The TFT array substrate includes a substrate, a display area and a peripheral area surrounding the display area. The display area and the peripheral area are arranged above the substrate. The peripheral area comprises a signal line and a shielding layer arranged above the signal line, and the shielding layer covers the signal line to shield EMI caused by a signal on the signal line. The TFT array substrate, the display panel and the display device can protect the display panel against EMI caused by the signal on the signal lines in the peripheral area, thereby improving stability and reliability of the TFT array substrate, the display panel and the display device, and enhancing sensitivity of a cellphone having the display panel.