OLED Array Substrate Curved Light-Emitting Unit
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Solution Overview
Problem
Organic light-emitting diode (OLED) display panels suffer from a microcavity effect that limits view angle and light emission area due to the interference of photon beams between the anode and cathode, resulting in narrow view angles and uneven light intensities at different observation angles.
Innovation Solution
The array substrate features a light-emitting unit with a concave or convex structure formed on a planarizing layer with a recess, increasing the light-emitting area by allowing light to emerge in multiple directions, and a semitransparent metal cathode enhances this effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a flat light-emitting unit structure is used, then the manufacturing process is simple, but the light-emitting area is limited and view angle is narrow
Solution Approach 1:
The patent applies curvature by forming a recess (concave structure) in the planarizing layer beneath the light-emitting unit. This curved surface allows light to emerge in multiple directions rather than perpendicular to a flat surface, thereby increasing the effective light-emitting area and view angle without significantly complicating the manufacturing process
Solution Approach 2:
The patent transitions from a two-dimensional flat light-emitting surface to a three-dimensional concave structure by forming a recess in the planarizing layer. This dimensional change enables light to be emitted from both the bottom surface and the side walls of the recess, effectively increasing the light-emitting area beyond the projected area on the base substrate
2Illumination intensity
If a flat light-emitting unit structure is used, then the device structure is simple, but light intensities are uneven at different observation angles
Solution Approach 1:
The concave recess structure acts as a micro-cavity that redistributes light emission in multiple directions. The curved side walls of the recess enable light to emerge at various angles, creating more uniform light intensity distribution across different observation angles and reducing the microcavity effect that causes uneven illumination
3Area of moving object
If the light-emitting area is increased using a concave structure, then view angle and light emission are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the recess dimensions by controlling the thickness of the planarizing layer (5-7 μm) and the depth of the recess to be less than this thickness. These parameter specifications ensure that the concave structure can be manufactured with standard precision while still achieving the desired light-emitting area increase and view angle improvement
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 the light-emitting area and view angle, providing more uniform light intensities and colors at different angles, thereby improving the display effect.
Implementation Method 1
a light-emitting unit is provided above a base substrate, wherein the light-emitting unit is formed to comprise a concave or convex structure
Implementation Method 2
the cathode away from the base substrate typically uses a semitransparent metal structure, which may also increase the reflection of light
Implementation Method 3
The microcavity effect mainly means that photon densities of different energy states are redistributed such that only the light having a specific wavelength is emitted at a specific angle after complying with the resonant cavity mode
Data Source
AI summary
The present disclosure provides an array substrate and a manufacturing method thereof and an organic light-emitting display apparatus. The array substrate comprises a plurality of sub-pixel zones, each of which comprising a light-emitting unit provided above a base substrate, wherein the light-emitting unit is formed to comprise a concave or convex structure, so that the light-emitting area of the light-emitting unit is greater than the projected area of the light-emitting unit onto the base substrate. Compared to the prior art, the present disclosure can increase the amount of light emission in each sub-pixel zone, so that the view angle of the display may be increased and the display effect may be improved.