Magnetic Anisotropy Barrier Wall for PL-LCD Light Efficiency
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Solution Overview
Problem
Photo-luminescent liquid crystal display (PL-LCD) devices suffer from diminished light emission efficiency due to significant light loss through total internal reflection at substrate boundaries, resulting in only about 10% of the backlight light being emitted externally, compared to conventional LCDs.
Innovation Solution
Incorporating a magnetic anisotropy barrier wall within the color conversion layer of the display device, aligned perpendicular to the substrate, to enhance light emission efficiency by reflecting and redirecting excited light away from the substrate boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a photo-excited member is used in the color conversion layer to emit excited lights of different colors, then the light emission efficiency is improved compared to conventional color filters, but total internal reflection at substrate boundaries causes significant light loss (only about 10% of backlight light is emitted externally)
Solution Approach 1:
A magnetic anisotropy barrier wall is introduced as an intermediary component within the color conversion layer. This barrier wall serves as a mediator to intercept and redirect excited light that would otherwise undergo total internal reflection at substrate boundaries, converting the harmful reflective loss into useful external emission.
Solution Approach 2:
The magnetic anisotropy barrier wall changes the optical parameters of the color conversion layer by introducing magnetic particles with specific anisotropy properties. This alters the light propagation characteristics, enabling the barrier wall to reflect and redirect excited light at controlled angles, thereby changing the emission pattern from total internal reflection to useful external emission.
2Illumination intensity
If a magnetic anisotropy barrier wall is added to the color conversion layer to redirect excited light, then light emission efficiency is improved, but the device complexity increases
Solution Approach 1:
The magnetic anisotropy barrier wall is merged with the existing color conversion layer structure rather than being implemented as a separate component. The barrier wall is formed within the same layer that contains the photo-excited members, combining the color conversion function and the light redirection function into a single integrated structure, thereby minimizing additional complexity.
Solution Approach 2:
The color conversion layer is designed to perform multiple functions simultaneously: it contains the photo-excited members for color emission and the magnetic anisotropy barrier wall for light redirection. This multi-functional design eliminates the need for separate components, reducing overall device complexity while achieving improved light emission efficiency.
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 magnetic anisotropy barrier wall significantly improves light emission efficiency by reflecting excited light back into the display panel, increasing the external emission of light from the display device.
Implementation Method 1
when the excited light of the photo-excited member included in the color conversion layer is emitted through a substrate covering the color conversion layer or emitted in the air, a considerable amount of the excited light undergoes total internal reflection at boundary surfaces of layers forming the substrate or the like to be emitted downwards into the color conversion layer
Implementation Method 2
Photo-luminescent liquid crystal display (PL-LCD) devices are a type of liquid crystal display (LCD) device that commonly include a fluorescence pattern and an ultraviolet (UV) lamp in lieu of a color filter pattern and a fluorescent lamp
Data Source
AI summary
A display device includes a first substrate including a first surface and a second surface, a second substrate disposed on the second surface of the first substrate, a liquid crystal layer disposed between the first substrate and the second substrate, a color conversion layer disposed on the second substrate, and a third substrate disposed on the color conversion layer. The second surface of the first substrate is opposite the first surface of first substrate. The color conversion layer includes a magnetic anisotropy barrier wall.