	US 12,066,697 B2
	Quantum dot light diffuser plate and method for making the same
Chih-Wen Yang, Taoyuan (TW); and Yu Wei Chang, Taoyuan (TW)
Assigned to Entire Technology Co., Ltd., Taoyuan (TW)
Filed by Entire Technology Co., Ltd., Taoyuan (TW)
Filed on Jul. 27, 2022, as Appl. No. 17/875,047.
Claims priority of application No. 111101887 (TW), filed on Jan. 17, 2022.
Prior Publication US 2023/0229027 A1, Jul. 20, 2023
Int. Cl. G02F 1/017 (2006.01); G02F 1/13357 (2006.01)

CPC G02F 1/01791 (2021.01) [G02F 1/133603 (2013.01); G02F 1/133606 (2013.01)]

16 Claims

1. A quantum dot light diffuser plate capable of being assembled on a backlight module with a plurality of blue light emitting diodes (LEDs); the backlight module comprising a substrate and the blue LEDs arranged on the substrate in an array form; the quantum dot light diffuser plate being located above the substrate and comprising:

a plate body, having an upper surface and a lower surface; the lower surface facing the substrate;

a plurality of microstructures, formed on the upper surface of the plate body in an array form; the microstructures forming a plurality of convex portions and a plurality of concave portions on the upper surface of the plate body; the concave portions being separated by the convex portions, such that the concave parts are independent and not communicated with each other;

a quantum dot layer, disposed at the plurality of the concave portions on the upper surface of the plate body; wherein, a thickness of the quantum dot layer is t1, a distance from a top of the convex portions to a bottom of the concave portions is t2; wherein t1<t2; and

a water-blocking and gas-blocking layer, disposed on the upper surface of the plate body and covering the plurality of the convex portions and the quantum dot layer;

wherein, the plate body comprises one of the following material: polycarbonate (PC), polystyrene (PS), polymethyl methacrylate (PMMA), polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET);

wherein, the plate body is formed by foam extrusion molding, and includes a plurality of microbubbles in the plate body; a weight reduction rate of the microbubbles to the plate body is 15-25%, and an average size of the microbubbles is between 60˜800 μm; wherein, a calculation formula of the weight reduction rate is:

weight reduction rate (%)=(W1−W2)/W2*100%;

W1=H*(L1*L2*D);

wherein:

H is an average thickness of the plate body (mm);

L1 is a length of the plate body (mm);

L2 is a width of the plate body (mm);

D is a density of a raw material of the plate body (g/mm³);

W1 is a theoretical weight (g) of the plate body, that is, the weight when the microbubbles are not included;

W2 is an actual weight (g) of the plate body, that is, the actual weight of the plate body containing a plurality of the microbubbles is actually weighed by a scale.