OLED Panel Concave Structure and Convex Microlens Light Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
OLED panels experience light loss due to photons emitted at large angles not being collected by the human vision system, as existing micro convex lens arrangements are inefficient in converging light from a large area light-emitting surface into a collimated beam.
Innovation Solution
The OLED panel incorporates a concave structure, a light-emitting layer, a planarization layer, and a convex microlens stacked and aligned on a substrate, with the light-emitting layer conformally laminated on the concave structure, allowing light emitted at angles to pass through the focal point of the convex microlens, increasing the proportion of parallel light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a micro convex lens is disposed above each OLED sub-pixel to collect light photons emitted in large angles, then light collection capability is improved, but the light-emitting surface area is large causing light photons to not converge properly into a collimated beam
Solution Approach 1:
The light-emitting surface is divided into multiple independent light-emitting regions, each corresponding to one convex microlens. This segmentation allows each microlens to focus light from a smaller, more manageable area, improving convergence precision while maintaining overall light collection capability.
Solution Approach 2:
The patent introduces a concave curved surface structure on the light-emitting layer that works in conjunction with the convex microlens. This curved surface helps to pre-converge light rays before they enter the microlens, improving the overall convergence effect and enabling better collimation of the output light beam.
2Illumination intensity
If a convex microlens is used to refract light into a parallel beam, then light directionality is improved, but not all light photons from the large area light-emitting surface can be converged
Solution Approach 1:
By dividing the light-emitting surface into multiple regions and assigning each region to a dedicated convex microlens, the system maximizes the utilization of light photons from each segment. This ensures that light photons are more effectively converted into parallel beams, reducing waste and improving overall display brightness.
Solution Approach 2:
The concave curved surface structure pre-converges light rays before they enter the convex microlens, increasing the proportion of light photons that can be effectively converged into parallel beams. This enhances light utilization efficiency and reduces energy loss.
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 enhances display brightness by increasing the effective light-emitting area and reducing light waste, ensuring more photons are emitted as parallel beams that reach the human vision system without increasing voltage across the OLED thin film.
Implementation Method 1
light photons near the focal point of a convex lens will be refracted and emerged into a parallel light beam through the convex lens
Implementation Method 2
through a coupling effect of the concave structure and the convex microlens, a proportion of parallel light in light outputted from the convex microlens is increased
Data Source
AI summary
An organic light-emitting display (OLED) panel includes a substrate and a light-emitting pixel array disposed on the substrate and including a plurality of light-emitting pixels, each of the plurality of light-emitting pixels includes a concave structure, a light-emitting layer, a planarization layer, and a convex microlens which are sequentially stacked up and aligned up on the substrate in such a manner that light emitted in an angle perpendicular to the light-emitting layer on the concave structure pass through an focal point of the convex microlens.