Display device
A display device includes: a backlight module including a backlight source and a light profile adjustment film; and an optical machine module disposed on a side of the light profile adjustment film away from the backlight source. The light profile adjustment film includes an optical adjustment microstructure, and included angles between main optical axes and normal lines of light emitted from the backlight source after passing through the light profile adjustment film are centrally symmetrical with respect to a center of the light profile adjustment film. The included angle is increased or remains unchanged from the center of the light profile adjustment film to an edge of the light profile adjustment film.
1 . A display device, comprising:
a backlight module, wherein the backlight module comprises a backlight source and a light profile adjustment film disposed on a light exit side of the backlight source, the backlight source is a collimated backlight source, and the light profile adjustment film is configured to receive light emitted from the light exit side of the backlight source and emit beams of light respectively from positions on a surface of the light profile adjustment film away from the backlight source, wherein the backlight source comprises: a reflector disposed at a side of the backlight source away from the light profile adjustment film, a light guide plate disposed between the reflector and the light profile adjustment film, and a light turning film disposed on a side of the light guide plate close to the light profile adjustment film; and
a display module, disposed on the surface of the light profile adjustment film away from the backlight source,
wherein the light profile adjustment film comprises an optical adjustment microstructure, the optical adjustment microstructure comprises a plurality of light diffuser structures arranged in a matrix, a side of each of the plurality of light diffuser structures close to the backlight source is a flat surface, a side of each of the plurality of light diffuser structures away from the backlight source is a curved surface, and the curved surface is expressed as KX 2 +LY 2 =Z, wherein K and L are constants, X, Y, and Z respectively represent variables in a first direction, a second direction perpendicular to the first direction, and a third direction perpendicular to the first direction and the second direction, and a ratio of K to L ranges from one to four;
an angle is formed by a main optical axis of each of the beams of light and a normal line of the light profile adjustment film at a corresponding one of the positions respectively, and the angle between the main optical axis and the normal line of the beams of light, after the light emitted from the backlight source passes through the light profile adjustment film, is centrally symmetrical with respect to a center of the light profile adjustment film, wherein the main optical axis refers to a center line of each of the beams, and the normal line refers to a line perpendicular to a horizontal plane at the corresponding one of the positions, and wherein the horizontal plane is parallel with the flat surface of each of the plurality of light diffuser structures; and
the angle between the main optical axis and the normal line of the beams, after the light emitted from the backlight source passes through the light profile adjustment film, remains unchanged for respective ones of the beams for any position from the center of the light profile adjustment film to an edge of the light profile adjustment film,
wherein a cone of each of the beams, after the light emitted from the backlight source passes through the light profile adjustment film, is within a range from 20° to 25°.
2 . The display device of claim 1 , wherein uniformity of the beams of light emitted from the light profile adjustment film, after the light emitted from the collimated backlight source passes through the light profile adjustment film, is greater than 90%.
3 . The display device of claim 1 , wherein the backlight source further comprises:
a light source disposed on a side of the light guide plate; and
a protection layer disposed on a side of the light turning film close to the light profile adjustment film.
4 . The display device of claim 1 , wherein the ratio of K to L is two.
5 . The display device of claim 1 , wherein the cone of each of the beams of light emitted from the light profile adjustment film, after the light emitted from the backlight source passes through the light profile adjustment film, has a constant value of approximately 25° at any position along the light profile adjustment film from the center of the light profile adjustment film to the edge of the light profile adjustment film.