Display Device With Shared Emission Layer and Selective Openings
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Solution Overview
Problem
The production process of display devices is complex due to the need for separate light-emitting layers that emit red, green, and blue lights, which complicates the manufacturing process.
Innovation Solution
A display device with a continuous first light-emitting layer that coincides in plan view with multiple pixel electrodes, sharing the layer across different sub-pixels, and opening configurations for other light-emitting layers to simplify the production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate light-emitting layers are used for red, green, and blue sub-pixels, then each sub-pixel can emit its specific color, but the production process becomes complex
Solution Approach 1:
The patent merges the light-emitting layers by making the first light-emitting layer (for red emission) continuous and shared across red, green, and blue sub-pixels. This single continuous layer replaces what would traditionally require three separate patterned layers, thereby simplifying the production process while maintaining color emission accuracy through selective activation in different sub-pixel types
Solution Approach 2:
The first light-emitting layer serves multiple functions simultaneously: it acts as the light-emitting layer for red sub-pixels, and as an electron-transport layer or charge-generating layer for green and blue sub-pixels. This multi-functionality reduces the total number of layers needed and simplifies manufacturing while preserving the specific color emission capabilities of each sub-pixel type
2Manufacturing precision
If multiple separate light-emitting layers are patterned for different colors, then color accuracy is maintained, but manufacturing steps increase
Solution Approach 1:
By combining the light-emitting layers into a single continuous first light-emitting layer that spans red, green, and blue sub-pixels, the patent eliminates the need for multiple separate patterning steps. This merging approach maintains color accuracy through the layer's uniform structure while dramatically improving production efficiency by reducing the number of manufacturing steps
Solution Approach 2:
While the first light-emitting layer is continuous, the patent applies segmentation to the second and third light-emitting layers by providing openings only in specific regions (green and blue sub-pixel areas). This selective segmentation allows the continuous first layer to function differently in different regions, maintaining color precision while simplifying production
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The continuous light-emitting layer simplifies the production steps by reducing the need for separate patterning, enhancing electron injection efficiency, and improving charge transportation between layers.
Implementation Method 1
a first light-emitting layer that coincides in plan view with a plurality of the pixel electrodes included in the plurality of first sub-pixels; a second light-emitting layer that coincides in plan view with a plurality of the pixel electrodes included in the plurality of second sub-pixels; and a third light-emitting layer that coincides in plan view with a plurality of the pixel electrodes included in the plurality of third sub-pixels
Data Source
AI summary
According to an aspect of the disclosure, a first light-emitting layer coincides in plan view with each whole of a plurality of pixel electrodes included in a plurality of second sub-pixels, and with each whole of a plurality of pixel electrodes included in a plurality of third sub-pixels. The first light-emitting layer is shaped into a continuous form. A third light-emitting layer in plan view: has an opening kb1 inside a peripheral end portion of each of a plurality of pixel electrodes included in a plurality of first sub-pixels, and coincides with a whole circumference of the peripheral end portion; and has an opening inside a peripheral end portion of each of a plurality of pixel electrodes included in the plurality of second sub-pixels, and coincides with a whole circumference of the peripheral end portion.