Notch Display Wiring Layout for Luminance Uniformity
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Solution Overview
Problem
Luminance variation occurs in display devices with camera notches due to non-uniform bus line loads between the main display portion and the notch display portion.
Innovation Solution
A display device design that includes a frame region surrounding the notch portion with lead wiring lines formed of different metal layers, where these lines overlap via an inorganic insulating film, with specific regions designed to straddle the ends of the wiring lines, effectively distributing the load and reducing misalignment capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display region includes a notch portion for camera integration, then the adaptability and functionality of the display device are improved, but luminance variation occurs due to non-uniform bus line loads between the main display portion and the notch display portion
Solution Approach 1:
The patent applies local quality by forming lead wiring lines using different metal layers in different regions. Specifically, in the frame region on the periphery of the notch portion, the first lead wiring line is formed of a first metal layer while the second lead wiring line is formed of a second metal layer, creating region-specific electrical characteristics that balance the bus line loads between the main display and notch display portions, thereby suppressing luminance variation.
Solution Approach 2:
The patent utilizes the layer dimension by forming lead wiring lines in different metal layers (first metal layer and second metal layer) that are stacked in the vertical direction. These lead wiring lines overlap via an inorganic insulating film, effectively using the third dimension (depth/layer) to distribute electrical loads and reduce luminance variation caused by the notch portion.
2Illumination intensity
If lead wiring lines are formed of different metal layers in the frame region, then the bus line load difference between main and notch display portions is reduced, but the manufacturing process complexity increases
Solution Approach 1:
The patent changes the material parameter of the lead wiring lines by using different metal layers (first metal layer and second metal layer) in the frame region. This parameter change allows for differential electrical characteristics that balance the bus line loads, achieving luminance uniformity while the manufacturing process incorporates these variations through standard multi-layer metal formation techniques.
3Illumination intensity
If the first and second lead wiring lines overlap via an inorganic insulating film, then the electrical load distribution is improved and luminance variation is suppressed, but the device structure becomes more complex
Solution Approach 1:
The patent merges the first lead wiring line and second lead wiring line in the vertical direction by having them overlap via an inorganic insulating film. This merging in the layer dimension allows both wiring lines to coexist in a compact space while maintaining their respective electrical functions, achieving load distribution without excessive horizontal expansion.
Solution Approach 2:
The inorganic insulating film serves as an intermediary between the first lead wiring line and the second lead wiring line. It provides electrical isolation while allowing the two metal layer wiring lines to overlap and function together, enabling the complex wiring structure to be manufactured using standard semiconductor fabrication processes.
Data Source
AI summary
A display device includes: a display region formed with a notch portion; and a frame region surrounding the display region, wherein the display region includes a first lead wiring line and a second lead wiring line. In a plan view, an extending direction of the first lead wiring line and an extending direction of the second lead wiring line are same. Either one lead wiring line of the first lead wiring line and the second lead wiring line includes a first region a second region.