OLED Micro Display Panel with Tuned Microcavity Layers
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Solution Overview
Problem
Existing OLED micro displays face challenges in achieving higher color gamut and brightness due to limitations in fine metal mask technology, which restricts the full potential of OLED color gamut and brightness.
Innovation Solution
An organic light emitting display substrate is designed with a reflecting layer, blocking layer, and transparent conducting layers of varying thicknesses to create a strong microcavity effect, allowing for optimized light emission and color gamut enhancement, featuring a structure with retaining walls, a light emitting layer, and semi-transparent, semi-reflective electrodes, along with a manufacturing method that includes forming retaining walls and printing transparent conductive liquid within pixel units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If white light and color film are used in OLED micro display, then the device can be manufactured, but the color gamut is limited to about 80% instead of greater than 100%
Solution Approach 1:
The patent divides the display into separate red, green, and blue pixel units with different cavity structures, eliminating the need for white light and color film. Each pixel unit independently emits its primary color through the microcavity effect, achieving color gamut greater than 100% while maintaining manufacturability through standardized pixel structures.
Solution Approach 2:
The patent implements local quality by creating different cavity lengths in different pixel units (red, green, blue) to optimize light emission for each color. The transparent conducting layers have varying thicknesses in different pixel units to achieve the strong microcavity effect for specific wavelengths, enabling high color gamut without compromising manufacturing.
2Illumination intensity
If traditional OLED structure is used, then the device can be manufactured, but higher brightness is difficult to obtain
Solution Approach 1:
The patent changes the optical parameters of the device by introducing a reflecting layer and transparent conducting layers with specific thicknesses to create a microcavity structure. This modifies the light emission characteristics to enhance brightness through constructive interference, achieving higher brightness without significantly increasing device complexity.
Solution Approach 2:
The patent converts the limitation of traditional OLED structures into an advantage by introducing the microcavity effect. The reflecting layer and transparent conducting layers transform ordinary light emission into enhanced brightness through optical interference, turning a standard structure into a high-performance display solution.
3Ease of manufacture
If fine metal mask is used for OLED manufacturing, then the device can be manufactured, but the manufacturing process is complex and costly
Solution Approach 1:
The patent extracts the color generation function from the traditional white light and color film approach, implementing direct color emission through red, green, and blue pixel units. This eliminates the need for fine metal mask patterning of color films, simplifying manufacturing while achieving color gamut greater than 100% and higher brightness through the microcavity effect.
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 higher color gamut and brightness by forming microcavity structures that enhance light emission intensity and color purity, simplifying the manufacturing process and reducing costs compared to traditional methods.
Implementation Method 1
the thicknesses of the transparent conducting layers of pixel units with different emitting colors are different, such that the light emitted by each pixel unit is transmitted between the reflecting layer and the second electrode to satisfy the strong microcavity effect
Data Source
AI summary
The present application discloses an organic light emitting display panel, a display device and a manufacturing method thereof. The organic light emitting display substrate includes: a reflecting layer disposed on a substrate and a blocking layer disposed on the reflecting layer, where the blocking layer includes retaining walls configured to separate each pixel unit, and a transparent conducting layer, a first electrode, a light emitting layer and a second electrode which is semi-transparent and semi-reflective are arranged in sequence on a side, facing away from the substrate, of the reflecting layer within each pixel unit defined by retaining walls; in a direction vertical to the substrate, the thicknesses of the transparent conducting layers of pixel units with different emitting colors are different, such that the light emitted by each pixel unit is transmitted between the reflecting layer and the second electrode to satisfy the strong microcavity effect.