OLED Subpixel Translucent Reflection Layer for Viewing Angle
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Solution Overview
Problem
Conventional OLED display devices using microcavity technology improve color purity and luminous efficiency for red and green but have low luminous efficiency for blue, and also suffer from reduced viewing angle characteristics.
Innovation Solution
The OLED display device selectively forms a translucent reflection layer in two or less of the red, green, and blue subpixels, with specific materials like aluminum, silver, or gold, and varying thicknesses of the common layer to enhance color purity and efficiency across all colors while maintaining or improving the viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a translucent reflection layer is formed in all three subpixels (red, green, and blue), then color purity and luminous efficiency are improved, but viewing angle characteristics deteriorate
Solution Approach 1:
The patent applies different structures to different subpixels: red and green subpixels include a translucent reflection layer to improve luminous efficiency and color purity, while the blue subpixel excludes this layer to maintain viewing angle characteristics. This local differentiation resolves the contradiction by optimizing each color channel according to its specific requirements.
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
This approach enhances the color purity and luminous efficiency of red, green, and blue subpixels, as well as the viewing angle characteristics, by optimizing the placement and thickness of the translucent reflection layer and common layers in the OLED display device.
Implementation Method 1
The microcavity technology is an optical technology using an effect that pieces of light emitted from an emission layer interfere with each other between the cathode and the anode
Implementation Method 2
Each of two or less of the three subpixels may comprise a translucent reflection layer
Data Source
AI summary
An organic light emitting diode (OLED) display device is provided. The OLED display device according to an embodiment of this document may comprise a substrate and a number of unit pixels placed over the substrate. Each of the unit pixels comprises emission layers each interposed between first electrodes and a second electrode. The unit pixel further comprises three subpixels emitting respective pieces of light of red, green, and blue. Each of two or less of the three subpixels may comprise a translucent reflection layer.