Organic Light Emitting Display Subpixel Color Emission
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Solution Overview
Problem
Organic light emitting displays face challenges in achieving full-color imaging without using color filters, which affect brightness and increase manufacturing costs.
Innovation Solution
The use of multiple light emitting devices with specific color emissions, such as magenta, green, and red/blue, along with complementary color filters, allows for full-color image display without the need for a color filter over the green light emitting device, enhancing brightness and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a color filter is used in the organic light emitting display to display full-color images, then the display can achieve full-color imaging, but the brightness in each color becomes different and the manufacturing cost increases
Solution Approach 1:
The pixel is divided into multiple sub-pixels, each containing a specific light emitting device that emits a particular color (red, green, blue, or white). By segmenting the color emission function into separate devices with different emitting characteristics, the display achieves full-color capability without requiring color filters, thereby maintaining brightness uniformity and reducing manufacturing costs.
2Adaptability or versatility
If a color filter is used in the organic light emitting display to display full-color images, then the display can achieve full-color imaging, but the manufacturing cost increases due to the color filter
Solution Approach 1:
The color filter component is completely removed from the display structure. Instead of using a color filter to achieve full-color imaging, the patent extracts the color selection function and implements it through multiple light emitting devices with inherently different emitting colors (red, green, blue, white), thereby eliminating the need for color filters and reducing manufacturing cost.
3Illumination intensity
If multiple light emitting devices with different colors are used, then full-color images can be displayed without color filters, but the device structure becomes more complex
Solution Approach 1:
Multiple light emitting devices (red, green, blue, and white emitting devices) are integrated into a single pixel structure, sharing common components such as the substrate, encapsulation layers, and electrode structures. This merging approach allows the display to achieve full-color capability without color filters while minimizing the increase in structural complexity through shared architectural elements.
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 enables the display of full-color images without color filters, improving brightness and reducing manufacturing costs by leveraging the emission characteristics of different light emitting devices and their corresponding filters.
Implementation Method 1
a hole and an electron are injected into an organic light emitting layer through an anode and a cathode and are recombined in the organic light emitting layer to generate an exciton. The exciton emits energy discharged when an excited state returns to a ground state as light.
Implementation Method 2
The first electrode includes first and second conductive layers that include a transparent conductive oxide material and a third conductive layer disposed between the first conductive layer and the second conductive layer and including a reflective material.
Data Source
AI summary
An organic light emitting display includes an array substrate, a plurality of light emitting devices disposed over the array substrate, and a plurality of color filters having different colors. The plurality of light emitting devices include a first light emitting device configured to emit light having a first color and a second light emitting device configured to emit light having a second color different from the first color, and the plurality of color filters include first and second color filters disposed over the first light emitting device and the second light emitting device, respectively.