OLED Array Substrate Microcavity Design
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Solution Overview
Problem
The existing microcavity structure in WOLED display devices is complex and requires different thicknesses for each color filter, making the manufacturing process complicated and costly.
Innovation Solution
A simplified array substrate design where a transflective layer and color filters of varying thicknesses are integrated between the OLED and the thin film transistor structure, forming a microcavity structure with the second electrode, allowing for easy control of microcavity thickness and reduced manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If microcavity structures with different thicknesses are formed for each color filter region, then light transmittance and brightness are improved, but the layer structure becomes complicated and manufacturing process complexity increases
Solution Approach 1:
The patent combines multiple functions into the color filter layer: it serves as both the color filtering element and the microcavity thickness control layer. By integrating the microcavity structure formation with the color filter deposition process, the patent eliminates the need for separate microcavity structure manufacturing steps, thereby reducing overall device complexity while maintaining the light transmittance enhancement benefit
Solution Approach 2:
The color filter layer is designed to perform multiple functions simultaneously: (1) color separation and filtering, (2) microcavity thickness determination for resonance enhancement, and (3) structural integration with the OLED device. This multi-functionality approach allows a single layer to address multiple requirements, simplifying the overall device architecture
2Illumination intensity
If microcavity structures with different thicknesses are formed for each color filter region, then light transmittance and brightness are improved, but the manufacturing process becomes complicated
Solution Approach 1:
The patent merges the microcavity structure formation with the color filter deposition into a single manufacturing step. The color filter layer is deposited to different thicknesses in different regions (RGB areas) while simultaneously forming the microcavity structures, thereby achieving brightness enhancement without adding manufacturing process complexity
Solution Approach 2:
The color filter layer is designed with spatially varying thickness: thicker in the blue region, medium in the green region, and thinner in the red region. This local quality variation allows each color region to have its optimal microcavity thickness for maximum brightness while using a single deposition process, maintaining ease of manufacture
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 increases light transmittance by forming a microcavity structure between the transflective layer and the reflective electrode, with color filters inside the microcavity, enabling easier manufacturing and cost-effective production of WOLED display devices with enhanced brightness.
Implementation Method 1
due to resonance effect, in light finally coming out of the transflective layer, light with a specific wavelength will be intensified
Implementation Method 2
light rays can be continuously reflected between layers
Data Source
Figure 1(a)~3
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Figure 7~9
AI summary
Embodiments of the present invention disclose an array substrate comprising a plurality of pixel units disposed on a base substrate (1), the pixel units comprising: a thin film transistor structure formed on the base substrate; and an OLED driven by the thin film transistor structure, the OLED disposed in a pixel region (A) of the pixel units, the OLED comprising sequentially in a direction away from the base substrate a first electrode (11) which is transparent, a light-emitting layer (13) and a second electrode (14) which reflects light; a transflective layer (8) disposed between the OLED and the thin film transistor structure; a color filter (9) disposed between the second electrode of the OLED (14) and the transflective layer (8); the second electrode of the OLED and the transflective layer constitute a microcavity structure.