Common-Electrode Light-Emitting Device with Overlapping RGB Layers
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Solution Overview
Problem
Existing layering type light-emitting devices have a high number of layers, which hinders background light transmission and complicates manufacturing.
Innovation Solution
A light-emitting device configuration with a common electrode and reduced number of layers, where the blue light-emitting layer overlaps the red and green layers, allowing for a tandem structure with two main layers and improved light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light-emitting layers are arranged in separate layers, then each color can be emitted independently, but the number of layers increases and background light transmission is reduced
Solution Approach 1:
The patent combines multiple light-emitting layers (red, green, blue) into a single integrated layer structure where different regions of the same layer emit different colors. This merging approach maintains color emission independence while reducing the total number of separate layers, thereby improving background light transmission.
Solution Approach 2:
The patent transitions from a vertical stacking arrangement (multiple layers in the thickness direction) to a planar arrangement (different color regions within the same layer). This dimensional change allows multiple colors to be emitted independently within a single layer, reducing device complexity and improving light transmission.
2Manufacturing precision
If multiple light-emitting layers are stacked vertically, then each layer can be optimized for its color, but the device thickness increases and material usage increases
Solution Approach 1:
The patent merges multiple color-specific light-emitting layers into a single layer with spatially separated emission regions. This allows each color to be optimized within its designated region while maintaining a reduced overall device thickness compared to vertical stacking of separate layers.
Solution Approach 2:
The patent implements local quality by creating distinct regions within the same layer that are optimized for specific colors (red, green, blue). Each region has tailored properties for its intended color emission while being part of an integrated single-layer structure, thereby reducing device thickness.
3Ease of operation
If separate pixel electrodes are provided for each color layer, then each layer can be controlled independently, but the number of electrodes and device complexity increases
Solution Approach 1:
The patent merges multiple color-specific pixel electrodes into a single pixel electrode that controls the entire light-emitting layer. This single electrode provides independent control over the integrated multi-color layer, reducing device complexity while maintaining ease of operation for color control.
Solution Approach 2:
The single pixel electrode serves multiple functions by controlling different regions of the light-emitting layer that emit different colors. This universal electrode replaces multiple specialized electrodes, reducing device complexity while maintaining independent color control capability.
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 configuration reduces the number of layers, enhances background light transmission, simplifies manufacturing, and enables high-resolution displays at a lower cost.
Implementation Method 1
a red light-emitting layer located between the red pixel electrode and the common electrode; a green light-emitting layer located between the green pixel electrode and the common electrode; a blue light-emitting layer located between the common electrode and the blue pixel electrode
Data Source
AI summary
A light-emitting device includes, on a substrate, a red pixel electrode and a green pixel electrode, a common electrode, and a blue pixel electrode, in order from the substrate side, and includes a transparent region adjacent to a light-emitting region including a position overlapping the red light-emitting layer, the green light-emitting layer, and the blue light-emitting layer in a plan view. At least a part of the blue light-emitting layer overlaps the red light-emitting layer and the green light-emitting layer adjacent to the red light-emitting layer in the plan view.