Display Panel Lens Layer for Higher Light Extraction
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Solution Overview
Problem
Existing display panels suffer from low light extraction efficiency due to total internal reflection at the interface between the cover plate and air, limiting brightness without increasing power consumption.
Innovation Solution
Incorporation of a lens layer with central and peripheral lenses having different refractive indices to converge light emission, reducing the incident angle and minimizing total reflection, thereby enhancing light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional flat display panel structure is used, then the device complexity is low, but the light extraction efficiency is low due to total internal reflection
Solution Approach 1:
The lens layer is segmented into multiple lens groups, where each lens group corresponds to a light-emitting device and contains multiple lenses with different refractive indices. This segmentation allows targeted light extraction optimization for each pixel region while maintaining overall structural organization.
Solution Approach 2:
Different regions of the lens layer have different refractive indices - the first lens group has a first refractive index and the second lens group has a second refractive index that is different from the first. This local quality variation enables optimized light extraction for different color channels or pixel types without requiring complete structural redesign.
2Illumination intensity
If the brightness of the display panel is increased by increasing power consumption, then the illumination intensity improves, but the energy efficiency deteriorates
Solution Approach 1:
The invention converts the harmful effect of total internal reflection (which causes light loss) into a beneficial effect by using the refractive index difference at the lens interfaces to redirect light that would otherwise be trapped. The lenses utilize the same optical phenomenon that causes the problem to instead enhance light extraction efficiency, thereby increasing brightness without additional power consumption.
3Loss of energy
If a single refractive index lens layer is used, then the manufacturing precision is easier to control, but the light extraction efficiency is limited
Solution Approach 1:
The lens layer is divided into multiple lens groups with different refractive indices, allowing each group to be optimized for specific light extraction requirements. This segmentation enables graduated complexity - starting with basic lens structures and adding refractive index variation only where needed for specific color channels or performance requirements.
Solution Approach 2:
The invention changes the refractive index parameter across different lens groups to optimize light extraction. By varying the refractive index between the first and second lens groups, the system can tailor light extraction characteristics for different regions or color channels, achieving superior optical performance through parameter optimization rather than structural complexity.
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
Improves brightness by increasing light extraction efficiency without increasing power consumption, utilizing refractive index differences in the lens layers to direct light away from critical angles of total reflection.
Implementation Method 1
each of the central lens and the peripheral lens includes an inner light-transmissive area and an outer light-transmissive area fitting and surrounding the inner light-transmissive area, and the refractive index of the inner light-transmissive area is greater than the refractive index of the outer light-transmissive area in the same lens group
Implementation Method 2
total internal reflection at the interface between the cover plate and air, limiting brightness
Data Source
AI summary
A display panel includes a driving backplane, a light-emitting layer, a lens layer, and a cover plate. The light-emitting layer is arranged on a side of the driving backplane and includes a plurality of light-emitting devices. The lens layer is arranged on a side of the light-emitting layer away from the driving backplane and includes a plurality of lens groups. One lens group is arranged corresponding to at least one light-emitting device. The lens group includes a central lens and a peripheral lens surrounding the central lens. The central lens and the peripheral lens include an inner light-transmissive area and an outer light-transmissive area surrounding the inner light-transmissive area. The refractive index of the inner light-transmissive area is greater than that of the outer light-transmissive area in the same lens group. The cover plate is arranged on a side of the lens layer away from the driving backplane.