OLED Display with Yellow-Blue Emission Layers and Optical Filter
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Solution Overview
Problem
Current OLED display technologies face limitations in achieving high resolution due to the minimum margin required for patterning organic emission layers, which restricts the resolution of sub-pixels.
Innovation Solution
The OLED display incorporates an organic emission layer with a blue emission layer and a yellow emission layer, along with a filter that includes blue light transmission, red light conversion, and green light conversion regions, allowing for a reduced number of organic emission layers per unit pixel while maintaining a minimum margin between sub-pixels, thereby enhancing resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple organic emission layers are used per unit pixel to achieve high resolution, then the resolution of sub-pixels is improved, but the minimum margin required for patterning increases, making manufacturing more difficult
Solution Approach 1:
The patent combines multiple emission functions into a single organic emission layer by using a yellow emission layer that can be optically converted to produce both red and green sub-pixels. This merging approach reduces the number of separate emission layers needed, thereby reducing the total patterning margin required while maintaining high resolution.
Solution Approach 2:
The patent introduces an optical conversion layer as an intermediary between the yellow emission layer and the final displayed colors. This conversion layer optically transforms the yellow light into red and green light, eliminating the need for separate red and green emission layers and their associated patterning margins.
2Ease of manufacture
If the number of organic emission layers is reduced, then the minimum margin for patterning is reduced, but the area and efficiency of sub-pixels may be compromised
Solution Approach 1:
The patent applies local quality by creating distinct regions within the yellow emission layer - some regions are optimized for red sub-pixel formation while others are optimized for green sub-pixel formation. This localized optimization ensures that each sub-pixel region maintains high efficiency despite the reduced number of emission layers.
Solution Approach 2:
The patent changes the optical parameters of the yellow emission layer and the optical conversion layer to optimize light conversion efficiency. By carefully selecting materials and adjusting optical properties, the system maintains high sub-pixel efficiency with fewer emission layers.
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 configuration achieves a higher resolution by optimizing the area and efficiency of sub-pixels, reducing the number of organic emission layers and minimizing the margin between neighboring sub-pixels, resulting in improved color temperature and overall display efficiency.
Implementation Method 1
The filter has a pattern corresponding to the yellow emission layer, which converts yellow light into red light and green light
Implementation Method 2
An OLED display emits light when excitons, which are generated by the combination of electrons and holes, fall from an excited state to a ground state
Data Source
AI summary
An OLED display including: a first substrate; an opposing second substrate; an organic light-emitting unit disposed on a side of the first substrate that faces the second substrate; a driving circuit disposed on a side of the second substrate that faces the first substrate and connected to the organic light-emitting unit; and a filter. The organic light-emitting unit includes that is an anode, a cathode, and an organic emission layer disposed therebetween. The organic emission layer includes a blue emission layer a yellow emission layer. The filter is to convert light from the yellow emission layer into red light and green light.