Organic Light Emitting Display Anode Electrode Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-resolution organic light emitting display devices face issues with anode electrode partial detachment due to reduced spacing between the anode electrode and contact hole, and color filters peeling due to island-type arrangement in high-resolution models.
Innovation Solution
The organic light emitting display device incorporates a pixel structure where anode electrodes extend away from contact holes by a certain distance to prevent partial detachment, and arranges color filters in a stripe type across multiple subpixels to prevent peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the area of subpixels is reduced to achieve high resolution, then the resolution is improved, but the anode electrode becomes partially detached due to reduced spacing from the contact hole
Solution Approach 1:
The anode electrode is segmented into multiple regions: a first anode electrode region directly connected to the contact hole, and a second anode electrode region extending toward the subpixel center. This segmentation allows the first region to maintain reliable connection at the contact hole interface while the second region provides sufficient spacing to prevent detachment, thus resolving the contradiction between high resolution (small subpixel area) and anode electrode attachment reliability.
2Measurement precision
If the area of subpixels is reduced to achieve high resolution, then the resolution is improved, but the color filters peel due to island-type arrangement
Solution Approach 1:
The color filters for adjacent subpixels are merged into a continuous stripe-type structure rather than being arranged as separate islands. This merging creates a larger, more stable color filter structure that spans multiple subpixels, preventing peeling while allowing each subpixel to maintain its reduced area for high resolution display.
3Reliability
If the contact hole area is maintained constant while increasing resolution, then the connection reliability is maintained, but the area occupied by contact holes increases relative to the subpixel area
Solution Approach 1:
The anode electrode structure is designed with different local qualities: the first anode electrode region has a configuration optimized for reliable connection to the contact hole (maintaining constant contact hole area and connection reliability), while the second anode electrode region is optimized to extend toward the subpixel center with appropriate spacing to prevent detachment. This local differentiation allows the system to maintain connection reliability without increasing the overall contact hole area ratio in high-resolution displays.
Data Source
AI summary
Disclosed is an organic light emitting display device for reducing or preventing anodes from being partially detached or torn in high resolution models. The organic light emitting display device includes a substrate including first and second subpixels disposed adjacent to each other in a first axis direction, a first anode electrode provided in the first subpixel and connected to a first TFT of the first subpixel through a first contact hole, and a second anode electrode provided in the second subpixel and connected to a second TFT of the second subpixel through a second contact hole. The first and second contact holes are disposed in a diagonal direction, the first anode electrode protrudes from the first contact hole in a direction toward the second subpixel, and the second anode electrode protrudes from the second contact hole in a direction toward the first subpixel. Accordingly, partial detachment of anode electrodes is reduced, or in some cases, prevented.