Gate-in-Panel Circuit Layout for Display Bezel Reduction
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Solution Overview
Problem
Conventional display devices have a significant non-display area (bezel) required for accommodating gate driving circuits, which limits the size reduction of the display panel and increases the overall thickness and weight due to longer signal paths and increased metal usage.
Innovation Solution
The display device incorporates a gate-in-panel circuit disposed within the display area, overlapping with the light emitting device layer vertically, and includes a shielding layer to shield electric fields, allowing the cathode and base voltage line connections to be within the display area, thereby reducing the bezel size and optimizing the layout for a thinner, lighter design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the gate driving circuit is disposed in the non-display area, then the circuit can be easily connected to the display panel, but the non-display area size increases
Solution Approach 1:
The gate driving circuit is moved from the planar non-display area into the display area, utilizing the vertical dimension by positioning the circuit in a lower layer that overlaps with the light emitting device layer. This dimensional transition allows the circuit to be accommodated within the display area footprint, reducing the non-display area size while maintaining connection feasibility through inter-layer routing.
Solution Approach 2:
The gate driving circuit is nested within the display area by positioning it in a lower layer that is vertically overlapped by the light emitting device layer. This nesting arrangement allows the circuit to be embedded within the display structure rather than occupying separate horizontal space, effectively reducing the bezel width.
2Area of stationary object
If the gate driving circuit is disposed in the display area, then the non-display area size is reduced, but the signal path length increases
Solution Approach 1:
By positioning the gate driving circuit in a lower layer that vertically overlaps with the light emitting device layer, the signal paths are routed through the vertical dimension using inter-layer connection structures. This vertical routing approach minimizes the horizontal signal path length within the display area while maintaining the reduced non-display area configuration.
3Area of stationary object
If the gate driving circuit overlaps with the light emitting device layer, then the bezel width is reduced, but electric field interference occurs
Solution Approach 1:
A shielding layer is introduced as an intermediary structure between the gate driving circuit in the lower layer and the light emitting device layer in the upper layer. This shielding layer acts as a barrier that blocks electric field interference from the circuit while allowing the overlapping configuration to maintain a reduced bezel width. The shielding layer enables the close vertical proximity of different functional elements without direct electrical interference.
4Ease of manufacture
If longer signal paths are used, then the gate driving circuit can be connected externally, but the device weight increases
Solution Approach 1:
The gate driving circuit is extracted from the external non-display area and integrated into the display area structure itself. This extraction eliminates the need for long external signal paths and reduces the overall device footprint, thereby reducing the weight of the display device while maintaining manufacturing feasibility through the integrated circuit placement.
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 configuration results in a significantly reduced non-display area, shorter signal paths, reduced metal usage, and improved image quality by eliminating unnecessary electrical effects, leading to a more compact and efficient display device.
Implementation Method 1
a shielding layer to shield electric fields, allowing the cathode and base voltage line connections to be within the display area
Data Source
AI summary
A display device according to one or more examples may include a substrate, a display area with a first display area and a second display area, a non-display area, a base circuit layer located on the substrate and including a gate-in-panel circuit and a subpixel circuit array disposed in the display area, and a light emitting device layer located on the base circuit layer and including two or more first light emitting devices disposed in the first display area and two or more second light emitting devices disposed in the second display area. The subpixel circuit array may include one first subpixel circuit configured to simultaneously drive the two or more first light emitting devices, and disposed in the second display area, and two or more second subpixel circuits configured to respectively drive the two or more second light emitting devices, and disposed in the second display area.