Array Substrate Microcavity Structure for WOLED Brightness
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Solution Overview
Problem
Conventional microcavity structures in WOLED display devices require complex fabrication processes due to the need for different thicknesses in microcavity structures corresponding to color filter films of different colors, increasing production complexity and costs.
Innovation Solution
An array substrate design where color filter films of different colors have varying thicknesses, forming microcavity structures by positioning the transflective layer between the organic light-emitting diode and the color filter film, allowing for adjustable microcavity thicknesses without additional layers, simplifying the fabrication process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If microcavity structures with different thicknesses are formed for different color pixel units, then light extraction efficiency and brightness are improved, but fabrication process complexity increases
Solution Approach 1:
The patent merges the color filter layer and the microcavity structure into a single integrated layer. The color filter layer itself serves as the microcavity structure, eliminating the need for separate microcavity layers with different thicknesses for different colors. This integration maintains the light enhancement function while significantly simplifying the fabrication process.
Solution Approach 2:
The color filter layer is given multiple functions: it serves both as the color filtering element and as the microcavity structure for light enhancement. This multi-functionality eliminates the need for additional dedicated microcavity layers, reducing fabrication complexity while maintaining brightness enhancement across all color pixel units.
2Illumination intensity
If separate microcavity structures with different thicknesses are formed for different colors, then wavelength-specific light enhancement is achieved, but production costs increase
Solution Approach 1:
By combining the color filter and microcavity functions into a single layer, the patent reduces the number of fabrication steps and material layers required. This integration directly lowers production costs while maintaining the ability to enhance specific wavelengths through the color filter's optical properties.
Solution Approach 2:
The color filter layer performs dual functions as both color selector and microcavity structure, eliminating the need for additional costly layers and fabrication steps. This multi-functional design reduces material costs and manufacturing complexity while achieving wavelength-specific light enhancement.
3Illumination intensity
If multiple layers are added to form microcavity structures, then light extraction efficiency is improved, but device structure complexity increases
Solution Approach 1:
The patent eliminates the need for separate microcavity layers by integrating this function into the color filter layer. This merging reduces the overall number of layers in the device structure while maintaining light extraction efficiency through the color filter's inherent optical resonance properties.
Solution Approach 2:
The color filter layer is designed to serve multiple purposes: color selection and light extraction enhancement through microcavity effects. This multi-functionality reduces structural complexity by eliminating dedicated microcavity layers while maintaining improved light extraction 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 design enhances light brightness by adjusting microcavity thicknesses for different colors, increasing blue light by 1.6 times, green light by 2.5 times, and red light by 2.2 times, while simplifying the fabrication process and reducing production costs.
Implementation Method 1
light with particular wavelength among the light ultimately emitted from the transflective layer will be enhanced due to the resonance effect
Implementation Method 2
Light from the light-emitting layer is repeatedly reflected between the reflecting layer and the transflective layer
Data Source
Figure 1(a)~3
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Figure 7~9
AI summary
Embodiments of the invention disclose an array substrate and a fabrication method thereof, and a display device. The array substrate comprises a plurality of pixel units disposed on a base substrate. Each pixel unit comprises a thin-film transistor region and a display region (A) other than the thin-film transistor region. A thin-film transistor structure is formed in the thin-film transistor region, and an organic light-emitting diode driven by the thin-film transistor structure is disposed in the display region. The organic light-emitting diode comprises a transparent first electrode (11), a light-emitting layer (13), and a second electrode (14) for reflecting light that are sequentially formed in a direction away from the base substrate. A transflective layer (8) is formed in the display region. A color filter film (9) is formed in the display region and is disposed between the second electrode (14) of the organic light-emitting diode and the transflective layer (8). The second electrode of the organic light-emitting diode and the transflective layer form a microcavity structure. The color filter films in the pixel units of different colors have different thicknesses.