LED Display Shielding Layer for Backside Wiring Interference
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Solution Overview
Problem
LED display panels face electrical coupling issues between pixel driving circuits on the front side and backside wiring, leading to display defects like pattern mura due to the electrical coupling effect, which affects the seamless splicing of panels.
Innovation Solution
Incorporating a conductive shielding layer with a DC level between the pixel structure and the substrate, or between the backside signal line and the substrate, to prevent voltage signal interference and mitigate display defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If backside wiring is disposed on the back side of the substrate to achieve ultra-narrow borders for seamless splicing, then the seamless splicing capability is improved, but electrical coupling effect occurs between the pixel driving circuit on the front side and the backside wiring, causing display defects
Solution Approach 1:
The patent introduces a shielding layer as an intermediary component between the pixel driving circuit on the front side and the backside wiring on the back side. This shielding layer acts as a mediator that blocks the electrical coupling effect, allowing the backside wiring to be positioned close to the edge for seamless splicing while preventing interference with the pixel driving circuit. The shielding layer is electrically connected to ground potential to effectively suppress the harmful electrical coupling.
2Manufacturing precision
If backside wiring is positioned close to the edge for seamless splicing, then the display quality is improved, but the operation stability of the pixel driving circuit deteriorates due to electrical coupling
Solution Approach 1:
The shielding layer serves as a protective intermediary that allows the backside wiring to be positioned close to the display edge for high manufacturing precision and seamless splicing, while simultaneously protecting the pixel driving circuit from electrical coupling interference, thus maintaining operation stability.
Solution Approach 2:
The shielding layer is pre-configured in the substrate structure to prevent electrical coupling interference before it can affect the pixel driving circuit operation. By establishing this protective barrier in advance, the patent ensures that the close positioning of backside wiring for seamless splicing does not compromise circuit reliability.
3Reliability
If a shielding layer is added to prevent electrical coupling, then the operation stability is improved, but the device complexity increases
Solution Approach 1:
The shielding layer is merged with the substrate structure and integrated into the existing manufacturing process flow. The shielding layer is formed as part of the substrate fabrication process, combining the shielding function with the substrate structure itself, thereby improving operation stability while minimizing the increase in device complexity.
Solution Approach 2:
The shielding layer serves multiple functions: it blocks electrical coupling interference, provides electrical connection to ground potential, and can be integrated with the substrate structure. This multi-functionality allows the patent to improve operation stability without proportionally increasing device complexity, as a single component achieves multiple protective and functional goals.
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 conductive shielding layer effectively reduces the interference from backside signal lines, improving the display quality by minimizing pattern mura and enabling seamless splicing of LED display panels.
Implementation Method 1
the pixel driving circuit disposed on the front side of the substrate and the backside wiring disposed on the back side of the substrate may produce an electrical coupling effect
Data Source
AI summary
A display apparatus includes a substrate, a pixel structure, a back side signal line, and a conductive shielding layer. The substrate has a first surface and a second surface opposite to each other. The pixel structure is disposed on the first surface of the substrate. The back side signal line is disposed on the second surface of the substrate and is electrically connected to the pixel structure. The conductive shielding layer is disposed between the pixel structure and the first surface of the substrate, and the conductive shielding layer has a DC level. Moreover, other display apparatuses are also provided.