OLED Display Panel Light Adjustment Structure for 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 extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If organic light emitting diode (OLED) is used as a light emitting device, then self-illumination is achieved and additional light source is not required, but large-angle light is limited to an interior of the display panel and cannot exit the display panel to contribute to light emitting of pixels
Solution Approach 1:
The patent changes the refractive index parameter by introducing a light adjustment structure layer with specific refractive index characteristics. This layer includes regions with different refractive indices that are optimized to refract large-angle light emitted by the OLED, enabling it to exit the display panel and contribute to pixel illumination, thereby improving light extraction efficiency and reducing power consumption.
Solution Approach 2:
The light adjustment structure layer acts as an intermediary between the OLED and the external environment. This intermediate layer with specific refractive index properties facilitates the transition of large-angle light from the OLED interior to the exterior, allowing light that would otherwise be trapped to contribute to the display output, thus resolving the contradiction between self-illumination capability and light extraction efficiency.
2Illumination intensity
If liquid crystals are used in liquid crystal display apparatus, then a backlight module is required to provide light source, but the display apparatus has a relatively large overall thickness and weight
Solution Approach 1:
The patent extracts the light source function from the traditional backlight module by using self-illuminating OLEDs. By removing the separate backlight unit and its associated structural components, the display apparatus achieves significant reduction in overall thickness and weight while maintaining the light emission capability through the OLED's intrinsic luminescence property.
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 adjusting the light paths of large-angle emissions, reducing power consumption and enhancing the display panel's performance by allowing more light to contribute to pixel illumination.
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
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.