Pixel Electrode Edge Overlap in OLED Subpixels Without Edge Cover Film
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Solution Overview
Problem
In display devices with an organic light-emitting layer, the exposed portions of the anode electrode can degrade during the patterning process of the edge cover insulating film.
Innovation Solution
A display device configuration where the entire circumference of the peripheral edge portion of the pixel electrode overlaps with multiple light-emitting layers, eliminating the need for an edge cover insulating film and reducing the number of processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an edge cover insulating film is formed to cover the exposed portion of the pixel electrode, then the pixel electrode is protected from degradation, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The invention extracts and eliminates the edge cover insulating film from the display device structure. By designing the light-emitting layer to extend beyond the pixel electrode boundaries, the patent removes the need for the separate edge cover component, thereby simplifying the manufacturing process while maintaining protection of the pixel electrode through the overlapping light-emitting layer configuration
Solution Approach 2:
The light-emitting layer is given a dual function: it not only emits light in the active area but also extends to cover and protect the peripheral edges of the pixel electrode. This multi-functional design eliminates the need for a separate protective edge cover, reducing manufacturing complexity while maintaining reliability
2Reliability
If an edge cover insulating film is formed to cover the exposed portion of the pixel electrode, then the pixel electrode is protected from degradation, but the manufacturing time and number of processes increase
Solution Approach 1:
The invention merges the protective function with the light-emitting layer formation process. By extending the light-emitting layer to overlap the pixel electrode edges, the patent combines the light emission function and edge protection function into a single layer, eliminating the need for separate edge cover formation processes and improving manufacturing efficiency
Solution Approach 2:
The light-emitting layer is designed to extend beyond the pixel electrode boundaries during the initial layer formation process, providing preliminary protection to the pixel electrode edges before any subsequent processing. This preliminary action eliminates the need for later edge cover formation steps, thereby improving productivity
Data Source
AI summary
A display device according to an aspect of the disclosure includes: a first subpixel including a first pixel electrode, a second subpixel adjacent to the first subpixel and including a second pixel electrode, and a third subpixel adjacent to the first subpixel and including a third pixel electrode, a first light-emitting layer overlapping the entire first pixel electrode, a second light-emitting layer overlapping the entire second pixel electrode, and a third light-emitting layer overlapping the entire third pixel electrode, wherein an entire circumference of a peripheral edge portion of the first pixel electrode overlaps the first light-emitting layer and at least one of the second light-emitting layer and the third light-emitting layer.