Display Panel Through-Hole Optics for Large-Angle Light Extraction
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Solution Overview
Problem
Current organic light emitting display technology suffers from low light extraction efficiency due to large-angle light being restricted within the display panel, which affects power consumption and overall performance.
Innovation Solution
A display panel with a light adjustment structure layer comprising light adjustment units and a dielectric layer, where the light adjustment units have a smaller refractive index than the dielectric layer, and include a through hole overlapping a light emitting device, allowing for refraction and adjustment of light paths to reduce total reflection and enhance light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If organic light emitting diode is used as light emitting device, then self-illumination is achieved and overall thickness is reduced, but light extraction efficiency is low due to large-angle light being restricted within the display panel
Solution Approach 1:
A light adjustment structure layer is introduced as an intermediary between the light emitting device layer and the external environment. This layer includes light adjustment units with through-holes that mediate the passage of light, allowing large-angle light to be extracted while blocking harmful elements, thereby improving light extraction efficiency without increasing power consumption
Solution Approach 2:
The light adjustment structure layer is positioned locally at the light emitting surface of the display panel, specifically where light extraction is needed. This localized structure adjusts the optical properties only in the critical region where light exits the panel, improving overall light extraction efficiency without affecting other parts of the display device
2Illumination intensity
If light adjustment structure layer is added to improve light extraction efficiency, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The light adjustment structure layer is implemented as a thin film structure with light adjustment units embedded within it. This thin-film approach adds minimal thickness to the display panel while providing the necessary optical adjustment function, thereby reducing structure complexity compared to bulkier alternative solutions
Solution Approach 2:
The light adjustment structure layer is formed using composite materials with specific refractive index properties. By selecting materials with appropriate optical characteristics, the structure achieves effective light extraction enhancement while maintaining a simple and integrated design, avoiding the need for multiple separate components
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
The solution improves light extraction efficiency by refracting large-angle light, reducing the probability of total reflection, and thereby lowering power consumption and enhancing the display panel's performance.
Implementation Method 1
each of the plurality of light adjustment units has a smaller refractive index than the dielectric layer... allowing for refraction and adjustment of light paths
Implementation Method 2
part of large-angle light emitted by the light emitting device is limited to an interior of the display panel and cannot exit the display panel to contribute to light emitting of pixels
Data Source
AI summary
Provided is a display panel, including: a base substrate, a light emitting device layer provided on the base substrate and including light emitting devices, and a light adjustment structure layer provided at a side of the light emitting device layer facing away from the base substrate and including light adjustment units and a dielectric layer covering the light adjustment units. Each light adjustment unit has a smaller refractive index than the dielectric layer and includes a light adjustment sub-section and a through hole penetrating the light adjustment unit in a direction perpendicular to the base substrate. The through hole overlaps one light emitting device, and the light adjustment sub-section surrounds the through hole. For one light adjustment unit, a thickness of the light adjustment sub-section gradually increases in a direction from the through hole to the light adjustment sub-section.