LED Display Layout With Shielding Layer for Narrow Bezels
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Solution Overview
Problem
Existing display devices with drive circuits on the substrate face challenges in narrowing the frame while maintaining a large display surface, due to increased complexity and cost associated with mounting ICs, and inefficient use of space.
Innovation Solution
The display device incorporates a shielding layer with a fixed potential between the display portion and the drive circuit portion, allowing the LED to overlap the drive circuit while minimizing noise interference and maintaining a narrow frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the drive circuit is arranged outside the display portion to narrow the frame, then the frame size is reduced, but the display surface area is limited and the layout becomes complex
Solution Approach 1:
The patent transitions from a planar arrangement where the drive circuit is separated from the display portion to a three-dimensional overlapping arrangement. The drive circuit is positioned to overlap with the display portion in the vertical direction, allowing the frame to be narrowed while maintaining both the drive circuit functionality and the display surface area. This dimensional change resolves the contradiction by utilizing the vertical space rather than being constrained to a two-dimensional layout.
2Length of stationary object
If the LED overlaps the drive circuit to achieve narrow frame, then the frame is narrowed and display surface is enlarged, but noise interference increases
Solution Approach 1:
The patent introduces a shielding layer as an intermediary element between the LED and the drive circuit. This shielding layer, positioned in the overlapping region, acts as a mediator that blocks or reduces the noise interference from the drive circuit while allowing the structural overlap to be maintained for frame narrowing purposes. The shielding layer enables the beneficial overlap configuration without suffering from the harmful noise effects.
Solution Approach 2:
The shielding layer is preliminarily positioned between the LED and drive circuit to prevent noise interference before it can affect the LED operation. By establishing this protective barrier in advance, the design proactively counteracts the potential harmful electromagnetic interference that would otherwise result from the overlapping arrangement, allowing the narrow frame configuration to be implemented successfully.
3Ease of operation
If ICs are mounted to drive the LEDs, then the drive function is achieved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent merges the drive circuit with the pixel circuit, integrating both functions into a unified circuit structure formed on the same substrate. This combination eliminates the need for separate IC mounting and wiring, thereby reducing manufacturing complexity and cost while maintaining the necessary drive functionality. The merged circuit approach consolidates multiple components into a single integrated structure.
Solution Approach 2:
The circuit structure is designed to perform multiple functions simultaneously - serving as both the pixel circuit for display control and the drive circuit for LED driving. This multi-functional design eliminates the need for separate dedicated drive circuit ICs, reducing the overall device complexity and manufacturing steps while achieving comprehensive drive functionality for the LED display.
Data Source
AI summary
A display device includes a display portion mounted with a first LED and a second LED are mounted, a pixel circuit portion provided with a first pixel-circuit thin film transistor electrically connected to the first LED and a second pixel-circuit thin film transistor electrically connected to the second LED, a drive circuit portion provided with a drive-circuit thin film transistor, and a shielding layer provided between the display portion and the drive circuit portion. A fixed potential is applied to the shielding layer. The second LED overlaps the drive circuit portion with the shielding layer therebetween.