OLED Display Electrode Structure with Step Compensation for Leakage Prevention
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Solution Overview
Problem
In organic light emitting diode (OLED) display devices, forming a light emitting layer that emits white light on all sub-pixels leads to issues such as reduced light extraction efficiency due to absorption by color filters and leakage currents between sub-pixels, resulting in degraded image quality.
Innovation Solution
The OLED display device incorporates an electrode structure with step compensation electrodes that overlap trenches in the boundary areas between sub-pixels, preventing leakage currents and enhancing light extraction efficiency by ensuring proper formation of the light emitting layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a light emitting layer emitting white light is formed on all sub-pixels, then mask alignment problems are eliminated, but light extraction efficiency is reduced due to absorption by color filters
Solution Approach 1:
The patent introduces trenches in the insulating layer to segment and isolate the light emitting layer into separate sub-pixel regions. This segmentation allows each sub-pixel to have its own color filter while maintaining a common white light emitting layer structure, thus resolving the contradiction between manufacturing simplicity and light extraction efficiency.
Solution Approach 2:
The patent introduces an insulating layer with trenches as an intermediary structure between the white light emitting layer and the color filters. This intermediary structure enables optical isolation while maintaining electrical connectivity, allowing light to reach the color filters efficiently without direct contact that would cause absorption losses.
2Device complexity
If a light emitting layer emitting white light is formed on all sub-pixels, then manufacturing complexity is reduced, but leakage current occurs between neighboring sub-pixels
Solution Approach 1:
The patent uses trenches in the insulating layer to segment the sub-pixels electrically while maintaining a common light emitting layer. This segmentation prevents charge carrier leakage between adjacent sub-pixels by creating physical barriers, thus improving reliability without significantly increasing manufacturing complexity.
Solution Approach 2:
The patent employs thin film insulating layers with patterned trenches to create electrical isolation between sub-pixels. These thin film structures provide effective leakage current prevention while maintaining flexibility and simplicity in the overall device structure.
Data Source
AI summary
An organic light emitting diode display device includes a first insulating layer on a substrate; a first reflective electrode on the first insulating layer in a first sub-pixel; a second insulating layer on the first reflective electrode and the first insulating layer; a second reflective electrode on the second insulating layer in a second sub-pixel; a third insulating layer on the second reflective electrode and the second insulating layer; a third reflective electrode on the third insulating layer in a third sub-pixel; trenches in the third insulating layer at boundary areas between the sub-pixels; first step compensation electrodes on the first insulating layer at opposite sides of the second sub-pixel, each first step compensation electrode partially overlapping a trench; and second step compensation electrodes on the second insulating layer at opposite sides of the first sub-pixel and the third sub-pixel, each second step compensation electrode partially overlapping a trench.