Organic Light Emitting Display Device Groove Pixel Electrode
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Solution Overview
Problem
Conventional organic light emitting display devices face challenges in manufacturing due to the time-consuming formation of partitions, which can damage the organic layer and reduce the device's lifetime due to moisture, oxygen, or solvent permeation.
Innovation Solution
The design includes a substrate with sub-pixel areas, switching and driving thin film transistors, a color filter, an insulating layer with grooves, and pixel electrodes with edges declined in the grooves, eliminating the need for partitions and enhancing insulation between the pixel and common electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If partitions are formed to define pixels in conventional organic light emitting display devices, then pixel definition is achieved, but manufacturing time increases and the organic layer is damaged by moisture, oxygen, or solvent permeation
Solution Approach 1:
The patent removes the partition structure entirely from the device architecture. Instead of forming partitions to define pixels, the invention uses the color filter pattern itself to define pixel boundaries, eliminating the partition formation step and its associated manufacturing time while avoiding damage to the organic layer from partition-related moisture and solvent permeation
Solution Approach 2:
The color filter layer serves dual functions: it provides color filtering for display purposes and simultaneously acts as the pixel definition structure. This multi-functionality eliminates the need for separate partition structures, reducing manufacturing steps and protecting the organic layer while maintaining proper pixel boundaries
2Reliability
If partitions are formed to define pixels in conventional organic light emitting display devices, then pixel definition is achieved, but the organic layer is damaged and device lifetime is reduced
Solution Approach 1:
The patent removes the partition structure that creates pathways for moisture, oxygen, and solvent permeation. By eliminating partitions and using color filter patterns for pixel definition, the harmful permeation paths are removed, protecting the organic layer and extending device lifetime
Solution Approach 2:
The invention converts the potential harm of extending color filters into pixel-defining structures into a benefit. The color filter patterns, which would normally just provide color filtering, now serve as the pixel boundary definition, eliminating the need for harmful partition structures while maintaining proper pixel isolation
3Manufacturing precision
If partitions are formed to define pixels, then pixel boundaries are defined, but manufacturing complexity and time increase
Solution Approach 1:
The color filter layer performs dual functions as both the color filtering element and the pixel definition structure. This eliminates the need for separate partition formation steps, maintaining precise pixel boundaries while significantly improving manufacturing efficiency by reducing the number of process steps
Solution Approach 2:
The patent merges the pixel definition function with the color filter structure. By combining these two functions into a single integrated structure, the invention maintains precise pixel boundaries without requiring separate partition formation, thereby improving manufacturing efficiency
Data Source
AI summary
Disclosed is an organic light emitting display device including a substrate having a plurality of sub-pixel areas, a switching thin film transistor formed on each of the sub-pixel areas, a driving thin film transistor connected to the switching thin film transistor, a color filter formed on at least one of sub-pixel areas, an insulating layer formed on the switching thin film transistor, the driving thin film transistor and the color filter, a pixel electrode connected to the driving thin film transistor, an organic light emitting member formed on the pixel electrode, and a common electrode formed on the organic light emitting member. The insulating layer has a groove. The groove is formed along a boundary of the pixel electrode. The groove has a width of about 0.2 to about 4 μm. The groove has a depth of about 0.2 to about 4 μm. The pixel electrode has an edge declined in the groove.