OLED Initialization Wiring Overlap Reduces Dead Space
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Solution Overview
Problem
Existing OLED displays have a significant non-display area, also known as dead space, which limits the size of the display and increases the bezel width, failing to meet consumer demands for larger screens with narrower bezels.
Innovation Solution
The OLED display incorporates a lower substrate divided into a display area and a non-display area, where the non-display area includes an embedded circuit unit for signal application and an initialization wiring that overlaps the embedded circuit unit, reducing dead space by allowing the initialization wiring to be formed in the same layer as pixel electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the initialization wiring is disposed adjacent to the embedded circuit unit without overlapping, then the embedded circuit unit is protected from external impacts, but the non-display area increases resulting in larger dead space
Solution Approach 1:
The initialization wiring is moved from a planar adjacent arrangement to a three-dimensional overlapping arrangement above the embedded circuit unit. This vertical positioning in another dimension allows the wiring to be closer to the display area while maintaining protection through the insulating layer, thereby reducing the non-display area without compromising protection functionality.
Solution Approach 2:
The initialization wiring is positioned to overlap and essentially surround the embedded circuit unit in the planar view, creating a nested configuration where the wiring acts as a protective enclosure. This nesting allows the wiring to serve both as a signal conduit and a protective barrier, reducing the need for separate protection structures that would increase dead space.
2Object-affected harmful factors
If the initialization wiring is formed in a separate layer from pixel electrodes, then the embedded circuit unit can be protected, but the manufacturing process becomes more complex
Solution Approach 1:
The initialization wiring is formed in the same layer as the pixel electrodes, merging two functional elements into a single manufacturing step. This integration reduces the total number of layers and simplifies the manufacturing process while the overlapping configuration over the embedded circuit unit maintains the protection function through the insulating layer barrier.
3Area of stationary object
If the initialization wiring completely overlaps the embedded circuit unit, then the dead space is minimized, but the wiring may be exposed to external impacts
Solution Approach 1:
An insulating layer is introduced as an intermediary between the initialization wiring and the embedded circuit unit. This mediator allows the wiring to completely overlap the circuit unit for space efficiency while the insulating layer provides the necessary protection from external impacts and electrical isolation, resolving the contradiction between compactness and protection.
4Area of moving object
If larger display area is achieved by reducing non-display area, then consumer demand for larger screens is met, but the embedded circuit unit and initialization wiring occupy more critical space
Solution Approach 1:
The initialization wiring is positioned in a vertical arrangement overlapping the embedded circuit unit, utilizing the third dimension to reduce planar footprint. This allows the circuits and wiring to occupy less critical horizontal space, enabling an enlarged display area while maintaining all necessary functional elements within the device structure.
Data Source
AI summary
An organic light-emitting diode (OLED) display is disclosed. In one aspect, the OLED display includes a lower substrate including a display area and a non-display area surrounding the display area, wherein a plurality of pixels are formed in the display area. The OLED display also includes an embedded circuit formed in the configured to apply a plurality of signals to the pixels, and an initialization wiring formed in the non-display area and configured to apply an initialization voltage to each of the pixels. The initialization circuit is formed in a layer so as to at least partially overlap with the area of the embedded circuit.