Light collimation device, backlight module and display device
AssigneeBoe Technology Group Co., Ltd.
InventorJifeng Tan
Life of this patent
Estimating the term…
Abstract
The present disclosure provides a light collimation device, a backlight module, and a display device, and relates to the field of display technology. The light collimation device includes: a curved reflection member configured to reflect a light from a light source disposed at a focus of the curved reflection member into a light guide member; the light guide member configured to make the light incident into the light guide member propagate by total reflection; and a light extraction structure disposed on the light guide member and configured to extract the light from the light guide member in a collimated manner.
Claims20
A light collimation device, comprising:
- a curved reflection member configured to reflect a light from a light source disposed at a focus of the curved reflection member into a light guide member;
- the light guide member configured to make the light incident into the light guide member propagate by total reflection;
- and
- a light extraction structure disposed on the light guide member and configured to extract the light from the light guide member in a collimated manner,
- wherein the curved reflection member comprises a curved surface portion and a flat surface portion adjacent to the curved surface portion, the flat surface portion being configured to reflect a light reflected by the curved surface portion into the light guide member, wherein a focus of the curved surface portion is the focus of the curved reflection member, and
- wherein a reflective light modulation grating is disposed on the flat surface portion and is configured to modulate a light from the light source not reflected by the curved surface portion to be incident into the light guide member and propagate by total reflection in the light guide member.
A light collimation device, comprising:
- a curved reflection member configured to reflect a light from a light source disposed at a focus of the curved reflection member into a light guide member;
- the light guide member configured to make the light incident into the light guide member propagate by total reflection;
- and
- a light extraction structure disposed on the light guide member and configured to extract the light from the light guide member in a collimated manner,
- wherein the light guide member comprises a light guide plate comprising a first face and a second face opposite to the first face, wherein an angle between the first face and a main axis of the curved reflection member is configured to make the light incident into the light guide plate propagate by total reflection between the first face and the second face,
- wherein a light modulation layer is disposed on one of the first face and the second face, and the light extraction structure is disposed on the other, and
- wherein a total reflection angle arcsin(n2/n1) at an interface between the light guide plate and the light modulation layer is between θ1 and θ2, wherein n1 is a refractive index of the light guide plate, n2 is a refractive index of the light modulation layer, and θ1 and θ2 are respectively a minimum incident angle and a maximum incident angle of the light incident into the light guide plate.
A light collimation device, comprising:
- a curved reflection member configured to reflect a light from a light source disposed at a focus of the curved reflection member into a light guide member;
- the light guide member configured to make the light incident into the light guide member propagate by total reflection;
- and
- a light extraction structure disposed on the light guide member and configured to extract the light from the light guide member in a collimated manner,
- wherein the light extraction structure comprises at least one of a grating, a prism, or a lens, the grating comprising a plurality of grating units, wherein the closer to the light source for one of the plurality of grating units, the smaller a diffraction efficiency of the one of the plurality of grating units.
Dependencies are inferred from the claim text.