Diffusion member, stacked body, diffusion member set, led backlight, and displaying apparatus
AssigneeDai Nippon Printing Co., Ltd.
InventorsMarii NISHIKAWA, Seiichi YOSHIMI, Keita ARIHARA
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Abstract
A diffusion member includes a first layer and a second layer, in this order, wherein the first layer has a light transmissivity and a light diffusivity, in the second layer, a reflectance of light increases as an absolute value of an incident angle with respect to a first layer side surface of the second layer decreases, and a transmittance of light increases as an absolute value of an incident angle with respect to a first layer side surface of the second layer increases.
Claims21
A diffusion member comprising a transmission type diffractive grating or a microlens array, and a dielectric multi-layer.
A diffusion member set comprising:
- a first member including a first layer, and a sealing material sheet configured to seal an LED element, and
- a second member including a second layer, and being used by placing on a first layer side surface of the first member via a void portion,
- wherein the first layer has a light transmissivity and a light diffusivity,
- in the second layer, a reflectance of light increases as an absolute value of an incident angle with respect to a first layer side surface of the second layer decreases, and a transmittance of light increases as an absolute value of an incident angle with respect to a first layer side surface of the second layer increases, and
- the sealing material sheet includes a sealing material composition containing a thermoplastic resin.
An LED backlight comprising:
- an LED substrate including a plurality of LED elements placed on one surface side of a supporting substrate, and
- a diffusion member placed on the LED element side surface of the LED substrate, and including a first layer and a second layer in this order from the LED substrate side,
- wherein the first layer has a light transmissivity and a light diffusivity,
- in the second layer, a reflectance of light increases as an absolute value of an incident angle with respect to a first layer side surface of the second layer decreases, and a transmittance of light increases as an absolute value of an incident angle with respect to a first layer side surface of the second layer increases.
An LED backlight comprising:
- an LED substrate including a plurality of LED elements placed on one surface side of a supporting substrate, and
- a diffusion member placed on the LED element side surface of the LED substrate,
- wherein the diffusion member includes a transmission type diffractive grating or a microlens array, and a dielectric multi-layer, in this order from the LED substrate side.
Dependencies are inferred from the claim text.