Organic Light-Emitting Display Device Red Wavelength Conversion
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Solution Overview
Problem
Traditional organic light-emitting display devices fail to effectively convert emitted light into a dominant wavelength of a particular color, particularly red, which limits their ability to produce a user-desired color output.
Innovation Solution
The device incorporates a substrate with three sub-pixels for emitting different colors, each with a specific organic light-emitting device and color filter configuration, including a transparent region in the red color filter to allow mixed light emission, enabling the conversion of red light to a user-desired wavelength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a traditional color filter is used in the red sub-pixel, then the structure is simple, but the dominant wavelength of red light cannot be converted to the desired wavelength
Solution Approach 1:
The color filter in the red sub-pixel is segmented into multiple regions (first region and second region) with different optical properties. The first region contains a red color filter layer that transmits red light, while the second region is transparent or has a different color filter that allows passage of other wavelengths. This segmentation enables precise control over the dominant wavelength of red light by adjusting the area ratios and positions of these regions, thereby resolving the contradiction between wavelength conversion precision and structural simplicity.
2Adaptability or versatility
If a red color filter is used to transmit red light, then red color is achieved, but the dominant wavelength cannot be extended beyond standard range
Solution Approach 1:
Different regions of the color filter are assigned different local qualities: the first region has red color filtering properties to ensure red color transmission, while the second region has transparent or different color filtering properties to enable wavelength extension. By locally optimizing the optical properties of each region, the patent achieves both color accuracy and wavelength adaptability, resolving the contradiction between wavelength adjustment range and color transmission precision.
3Manufacturing precision
If white light is emitted and separated through color filter, then color image is realized, but red light wavelength conversion is insufficient
Solution Approach 1:
The color filter is pre-configured with specific optical properties and geometric patterns (first and second regions with defined area ratios and positions) to perform wavelength conversion of red light before the light reaches the viewer. This preliminary wavelength adjustment ensures that the red light emitted from the organic light-emitting layer is converted to the desired dominant wavelength, improving both wavelength conversion precision and overall color image realization efficiency.
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 extends the dominant wavelength of red light emission, improving color realization and meeting recommended standards, such as for vehicle dashboard warning lights, by mixing red and blue light.
Implementation Method 1
an organic light-emitting display device, including an emission layer formed of an organic material
Implementation Method 2
separate the white color into three colors (e.g., primary colors) by passing the white color through a color filter
Data Source
AI summary
An organic light-emitting display device including a first organic light-emitting device including a first pixel electrode, a first organic emission layer (EML) for emitting white light, and an opposite electrode; a first color filter between an insulating layer and the first pixel electrode, and transmitting blue light; a second organic light-emitting device including a second pixel electrode, the first organic EML for emitting white light, and the opposite electrode; a second color filter between the insulating layer and the second pixel electrode, and transmitting green light; a third organic light-emitting device including a third pixel electrode, a second organic EML for emitting a mixture light including a red color and a blue color, and the opposite electrode; and a third color filter between the insulating layer and the third pixel electrode, and including a first region for transmitting red light and a second region for transmitting the mixture light.