Angled Micro-Cavity OLED Substrate for Enhanced Color Gamut
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Solution Overview
Problem
Current micro-cavity top emitting OLED devices have low efficiency and limited color gamut, restricting their application in display devices due to low light emission and short lifetime, which also limits the display quality and color purity.
Innovation Solution
An organic light emitting diode array substrate is designed with micro-cavity OLEDs arranged at an angle to the substrate plane, featuring slope surfaces that enhance light emission in the direction of direct vision, increasing the color gamut and display quality by altering pixel color coordinates and simplifying the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If micro-cavity top emitting OLEDs are formed on a plane substrate with conventional structures, then the device can be manufactured with standard processes, but the color gamut is limited and display quality is restricted
Solution Approach 1:
The patent introduces asymmetric slope surfaces on the substrate at specific pixel locations, creating angled light emission paths. This asymmetric structural modification enables shorter wavelength light to be emitted toward the direct vision direction, expanding the color gamut while maintaining compatibility with standard manufacturing processes through conventional photolithography and etching techniques.
Solution Approach 2:
The patent transitions from a conventional planar substrate surface to a three-dimensional structure with slope surfaces. This dimensional change introduces angular control over light emission, allowing optimization of color coordinates and gamut by directing different wavelengths at different angles, thereby enhancing display quality without compromising manufacturability.
2Adaptability or versatility
If the light emitting surface is angled to improve color gamut, then shorter wavelengths can be emitted in the direct vision direction, but the device structure becomes more complex
Solution Approach 1:
The patent applies slope surfaces selectively at specific pixel locations rather than uniformly across the entire substrate. This localized structural modification targets specific color enhancement needs while preserving the simplicity of the overall device structure and maintaining ease of manufacturing for the majority of the substrate area.
Solution Approach 2:
The patent uses photolithography patterns to define the slope surface locations and shapes, copying the desired angular geometry through standard semiconductor fabrication processes. This approach replicates the complex angled structures using conventional copying techniques, avoiding the need for specialized manufacturing equipment or processes.
3Manufacturing precision
If deep color light emitting material is used to enhance color purity, then the external quantum efficiency is improved, but the lifetime is far from application standard
Solution Approach 1:
The patent modifies the optical parameters of the device by introducing angled slope surfaces, which change the light extraction geometry and emission direction. This parameter change optimizes the external quantum efficiency and color purity simultaneously by directing shorter wavelengths toward the viewer, while the micro-cavity structure enhances lifetime through improved outcoupling efficiency, resolving the trade-off between color purity and reliability.
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 design significantly enlarges the color gamut and improves display quality by directing shorter wavelengths towards direct vision, maintaining or expanding the visual angle range while enhancing the display's color purity and gorgeousness.
Implementation Method 1
people have begun to study Fabry-Perot (F-P) micro-cavity top emitting OLED device
Implementation Method 2
which usually applies a distributed Bragg reflector with a reflectivity up to 99.9%
Implementation Method 3
an angle exists between a light emitting surface of at least one micro-cavity organic light emitting diode and the plane of the substrate, such that the light with shorter wavelengths in the spectrum of the micro-cavity organic light emitting diode can be emitted in the direction of direct vision
Data Source
AI summary
The present invention relates to the field of display, and discloses an organic light emitting diode array substrate, a manufacturing method thereof, and a display device, for the purposes of enlarging the color gamut of a display device and improving display quality. The organic light emitting diode array substrate comprises a substrate and multiple micro-cavity organic light emitting diodes which are disposed on the substrate and are arranged in arrays; wherein an angle exists between a light emitting surface of at least one micro-cavity organic light emitting diode and the plane of the substrate. In the embodiments of the invention, an angle exists between a light emitting surface of at least one micro-cavity organic light emitting diode and the plane of the substrate, such that the light with shorter wavelengths in the spectrum of the micro-cavity organic light emitting diode can be emitted in the direction of direct vision. The color coordinate value of a pixel can thus be changed, the pixel color is deepened, the color gamut of the display device is enlarged, the display color is more gorgeous, and the display quality is greatly improved.