Perovskite Color Conversion Layer for High-Saturation OLED Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current OLED display technologies face limitations in achieving high-resolution color displays with sufficient color saturation and gamut, as existing methods either rely on fine metal mask techniques that are resolution-limited or use white light and RGB filters resulting in low color saturation and narrow color gamut.
Innovation Solution
The implementation of a color conversion layer comprising red and green light conversion units made of organometallic halide perovskite materials, which absorb blue light and convert it into red and green light, respectively, allowing for improved color saturation and gamut, while eliminating the need for fine metal mask alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fine metal mask (FMM) is used to manufacture OLED display device with three sub-pixels of red, green, and blue, then color display is achieved, but resolution cannot be improved and high-resolution requirements cannot be satisfied
Solution Approach 1:
The patent extracts the color conversion function from the traditional FMM-based sub-pixel structure. Instead of using FMM to directly form red, green, and blue sub-pixels, the invention uses a blue light emitting layer combined with a color conversion layer containing red and green light conversion units. This extraction of the color conversion function eliminates the need for complex FMM alignment while achieving high resolution, as the color conversion layer can be formed by simple coating processes without requiring precise mask alignment.
Solution Approach 2:
The patent inverts the traditional approach by starting with a blue light emitting layer and converting it to red and green colors through the color conversion layer, rather than directly forming red, green, and blue sub-pixels using FMM. This inversion simplifies the manufacturing process by eliminating mask alignment requirements while maintaining high resolution capabilities, as the color conversion layer can be deposited as a continuous film that is then patterned or selectively activated.
2Ease of manufacture
If white light and RGB filters are used, then mask alignment is not required, but color saturation is low and color gamut is not wide enough
Solution Approach 1:
The patent changes the material parameters of the color conversion layer by using organometallic halide perovskite materials with specific optical properties. These materials have high photoluminescence quantum efficiency and can be tuned to emit highly saturated red and green light when excited by blue light. This parameter change in material composition enables high color saturation and wide color gamut while maintaining the ease of manufacture advantage, as the perovskite layer can be deposited by simple coating methods without requiring mask alignment.
Solution Approach 2:
The patent employs composite material structure combining blue light emitting organic materials with organometallic halide perovskite color conversion materials. This composite approach leverages the advantages of both materials: the blue OLED layer provides efficient light emission, while the perovskite color conversion layer provides high saturation red and green light conversion. The composite structure achieves wide color gamut and high color saturation without the manufacturing complexity of FMM alignment.
3Illumination intensity
If organometallic halide perovskite material is used for color conversion layer, then color saturation and gamut are improved, but manufacturing process complexity increases
Solution Approach 1:
The patent replaces complex mechanical mask alignment systems with a chemical/material-based solution. Instead of using FMM requiring precise mechanical alignment, the invention uses organometallic halide perovskite materials that can be deposited by wet chemical methods such as spin-coating or inkjet printing. These materials inherently provide the desired color conversion function through their optical properties, eliminating the need for complex mechanical alignment processes while achieving high color gamut.
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 color saturation and gamut to 120.2% of the standard color gamut, improves manufacturing flexibility, and reduces manufacturing costs by eliminating the resolution limitations of fine metal mask techniques.
Implementation Method 1
the red light conversion unit and the green light conversion unit absorb respectively blue light emitted from the blue light emitting layer and convert the blue light into red light and green light
Data Source
AI summary
The present invention provides an OLED display device and a manufacturing method thereof, and an OLED display. The OLED display device comprises a substrate, and a color conversion layer and a blue light emitting layer are stacked sequentially on the substrate; the color conversion layer comprises red light conversion units, green light conversion units, and opening units which are arranged separately; the red light conversion unit and the green light conversion unit are both film layers made of an organometallic halide perovskite material. The red light conversion unit and the green light conversion unit absorb blue light emitted from the blue light emitting layer and convert the blue light into red light and green light, respectively, and the opening unit transmits the blue light, so that the color conversion layer can output color light with high saturation to achieve color display.