Connecting Clad Electrode for OLED Transparent Area Preservation
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Solution Overview
Problem
The existing organic light-emitting display devices face issues with reducing the transparent area due to repair cutting regions, which decreases luminous efficacy and can damage adjacent elements during the repair process of defective light-emitting structures.
Innovation Solution
An organic light-emitting display device with a connecting clad electrode that has higher transmissivity than the lower emission electrode, including a repair cutting region that overlaps with the transparent area, allowing for effective repair without reducing the transparent area's transmissivity or the light-emitting area's aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the lower emission electrode includes a reflective layer to improve light extraction efficiency, then the luminous efficacy is improved, but the transparent area is reduced due to the repair cutting region overlapping with it
Solution Approach 1:
The lower emission electrode is segmented into two distinct regions: a reflective region (first region) that enhances light extraction efficiency in the emission area, and a transparent region (second region) that maintains high transmissivity in the transparent area. This segmentation allows each region to optimize its function without compromising the other, resolving the contradiction between luminous efficacy and transparent area preservation.
2Area of stationary object
If the repair cutting region is disposed in the light-emitting area to prevent reducing the transparent area, then the transparent area is preserved, but the opening of the emission area is reduced
Solution Approach 1:
The lower emission electrode is divided into reflective and transparent regions, allowing the repair cutting to be performed on the transparent region without affecting the light-emitting area opening. The reflective region is confined to the emission area while the transparent region extends into the transparent area, enabling repair operations to occur in the transparent region where cutting does not reduce the emission area opening.
Solution Approach 2:
Different regions of the lower emission electrode are assigned different optical properties: the first region has high reflectivity for light extraction in the emission area, while the second region has high transmissivity for light passage in the transparent area. This local differentiation of properties allows the repair cutting region to be positioned in the transparent area without compromising either the transparent area or the emission area opening.
3Area of moving object
If the repair cutting region overlaps with the transparent area to maintain the emission area opening, then the aperture ratio is maintained, but the transmissivity of the transparent area is reduced
Solution Approach 1:
The lower emission electrode is segmented such that the transparent region (second region) is specifically designed to maintain high transmissivity in the transparent area. This segmentation ensures that even when the repair cutting region overlaps with the transparent area, the transmissivity is preserved because the transparent region is optimized for light transmission rather than reflection.
4Ease of repair
If the lower emission electrode is cut by laser repair process, then defective light-emitting structures can be disconnected, but adjacent elements may be damaged
Solution Approach 1:
The lower emission electrode is designed with different regional properties: the reflective region provides strong light extraction in the emission area, while the transparent region provides high transmissivity and acts as a safer zone for laser repair operations. The localized differentiation allows repair cutting to be performed with reduced risk of damaging adjacent elements, as the transparent region is more tolerant of laser processing.
Data Source
Figure 1~2A
Figure 2B~3
Figure 4
AI summary
An organic light-emitting display device in which a connecting clad electrode (650) is disposed between a thin film transistor (TR2) and a light-emitting structure (500) is provided. The connecting clad electrode (650) may include a repair cutting region (653) overlapping with a transparent area (TA) of a lower substrate (100). Thus, in the organic light-emitting display device, reducing the area of the transparent area (TA) by the repair cutting region (653) may be prevented.