Multilayer OLED Display Using Cyan Magenta Emission and Color Filters
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Solution Overview
Problem
Existing organic EL display units with white light emitting devices face challenges in achieving sufficient color separation and compactness while maintaining high light emitting efficiency, as they require thick color filters to achieve favorable display performance.
Innovation Solution
A display unit with a multilayer structure comprising cyan and magenta organic light emitting devices and a color filter group with blue, yellow, red, green, and blue filters, which converts the emitted cyan and magenta lights into blue, green, and red lights, respectively, allowing for thinner color filters and improved light emitting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a white light emitting device is used with a color filter to achieve full color display, then the display can be fabricated without fine separate coating operations, but the color filter thickness must be increased to achieve sufficient color separation
Solution Approach 1:
The invention divides the light emitting function into multiple separate organic light emitting devices, each emitting a specific color (red, green, blue). This segmentation allows each device to emit light with a narrow bandwidth that is inherently well-separated, eliminating the need for thick color filters to achieve color separation while maintaining the simplified fabrication approach of using a color filter layer.
2Manufacturing precision
If the color filter thickness is increased to achieve sufficient color separation, then color purity improves, but light emitting efficiency decreases and compact characteristics worsen
Solution Approach 1:
The invention applies local quality by having each organic light emitting device emit light with a specific color and narrow bandwidth tailored to its function. The red, green, and blue devices each emit light with optimized spectral characteristics for their respective color, allowing the color filter layer to be thin while still achieving excellent color separation and high light emitting efficiency.
3Manufacturing precision
If the color filter thickness is increased to achieve sufficient color separation, then color purity improves, but the display unit compactness deteriorates
Solution Approach 1:
By segmenting the light emitting function into multiple dedicated color devices, the invention achieves superior color separation with thin color filters, thereby reducing the overall display unit thickness and improving compactness while maintaining high color purity.
4Device complexity
If multiple light emitting layers are used in a single light emitting unit to emit white light, then the structure is simplified, but color separation becomes insufficient without thick color filters
Solution Approach 1:
The invention resolves this contradiction by segmenting the single white light emitting unit into multiple separate organic light emitting devices, each dedicated to emitting a specific color. This segmentation provides inherent color separation through narrow bandwidth emission, allowing the use of thin color filters while maintaining simplified overall device structure.
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 enables effective color separation with reduced color filter thickness, enhancing light emitting efficiency and compactness of the display unit, while simplifying the manufacturing process by using fewer color filters.
Implementation Method 1
a light emitting device group that respectively has a plurality of cyan organic light emitting devices emitting cyan light and a plurality of magenta organic light emitting devices emitting magenta light
Implementation Method 2
a color filter group that has a plurality of blue filters transmitting blue light and a plurality of yellow filters transmitting yellow light
Data Source
AI summary
A display unit that secures favorable display performance and has a simple structure is provided. The display unit includes a multilayer structure in which an organic light emitting device group respectively having a plurality of organic light emitting devices that emits cyan light and a plurality of organic light emitting devices that emits magenta light and a color filter group having a plurality of blue filters that transmit blue light and a plurality of yellow filters that transmit yellow light are sequentially layered. In the display unit, the cyan light and the magenta light entering from the organic light emitting device group to the color filter group is converted to blue light by the blue filter, and is respectively converted to green light and red light by the yellow filter. Therefore, compared to a case that the organic light emitting device group emits white light, color separation is more facilitated.