Organic EL Display Scan Driver Layout for Bezel Reduction
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Solution Overview
Problem
Conventional organic EL display devices have large Bezel areas due to unnecessary curing margins, which increase the device size and create dead spaces where no images can be displayed, while attempting to protect the scan drivers from damage during the sealing process.
Innovation Solution
Optimizing the placement of the power supply line and ground line to be on the outer sides of the scan drivers, rather than between them, minimizes the need for curing margins and reduces the Bezel area by positioning the scan drivers inwardly, thus allowing for a more compact display device design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If curing margins are increased to protect scan drivers from UV damage, then reliability of scan drivers is improved, but Bezell area increases resulting in more dead spaces
Solution Approach 1:
The harmful factor (UV rays) is blocked by extracting the scan drivers from the direct path of UV exposure. The drivers are positioned in regions that do not receive UV irradiation during the curing process, eliminating the need for large curing margins while maintaining driver protection.
Solution Approach 2:
The layout transitions from a conventional arrangement where drivers are positioned at the edges requiring horizontal curing margins, to a configuration where drivers are placed in regions protected by the vertical arrangement of components. The power supply lines and ground lines are strategically positioned to create UV-shaded zones that protect the drivers without requiring additional horizontal space.
2Ease of operation
If scan drivers and power lines are positioned between pixel circuit and substrate, then connectivity is improved, but Bezel area increases
Solution Approach 1:
The electrical connections are routed through the vertical dimension by positioning power supply lines and ground lines in specific regions between the pixel circuit and substrate. This spatial arrangement maintains electrical connectivity while optimizing the horizontal layout to minimize the Bezel area.
Data Source
Figure 1a
Figure 1b
Figure 2a
AI summary
The present invention provides electro luminescence display devices comprising a pixel circuit comprising a pixel circuit comprising a plurality of pixels on a substrate; a data driver formed on one side of the pixel circuit for supplying a data signal to the plurality of pixels; at least one scan driver formed on at least one side of the pixel circuit for supplying a scan signal to the plurality of pixels; and a plurality of wirings connected to an outer circuit, wherein at least one of the plurality of wings is formed on a portion of perimeter of one or more of the data driver, the pixel circuit or the substrate.