BACKLIGHT MODULE AND LIQUID CRYSTAL DISPLAY DEVICE
First Claim
1. A backlight module, comprisinga light guide plate having a light incident surface, a light emitting surface and a reflective surface respectively connected to the light incident surface and opposite to each other;
- a light source provided adjacent to the light incident surface, and the light source having a blue LED, red quantum dots and green quantum dots, the light emitted from the blue LED is mixed with the red quantum dots and green quantum dots to form white light;
a diffusion sheet provided adjacent to the light emitting surface of the light guide plate;
a metal wire grid polarizing film disposed on a side of the light emitting surface of the light guide plate, and the diffusion sheet is disposed between the light guide plate and the metal wire grid polarizing film;
a quarter-wave plate disposed adjacent to the reflective surface of the light guide plate, wherein the angle between the fast axis of the quarter wave plate and the direction of the metal wire grid of the metal wire grid polarizing film is 45°
; and
a reflective sheet disposed on the side of the quarter-wave plate facing away from the light guide plate.
1 Assignment
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Accused Products
Abstract
The present application discloses a backlight module and a liquid crystal display device, the application utilizes a metal wire grid polarizing film instead of the rear polarizer, and an additional layer of quarter-wave plate is deposited on the reflective sheet. The light emitted from the light source and passed into the metal wire grid polarizing film, the light component perpendicular to the metal wire grid is effectively utilized, the light components parallel to the metal wire grid is reflected into the quarter-wave plate, the reflected light is converted into circularly polarized light by the quarter wave plate, after reflected by the reflective sheet, the direction of the circularly polarized light is reversed, the reversed circularly polarized light is further pass the quarter wave plate and into a polarized light perpendicular to the metal wire grid
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Citations
13 Claims
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1. A backlight module, comprising
a light guide plate having a light incident surface, a light emitting surface and a reflective surface respectively connected to the light incident surface and opposite to each other; -
a light source provided adjacent to the light incident surface, and the light source having a blue LED, red quantum dots and green quantum dots, the light emitted from the blue LED is mixed with the red quantum dots and green quantum dots to form white light; a diffusion sheet provided adjacent to the light emitting surface of the light guide plate; a metal wire grid polarizing film disposed on a side of the light emitting surface of the light guide plate, and the diffusion sheet is disposed between the light guide plate and the metal wire grid polarizing film; a quarter-wave plate disposed adjacent to the reflective surface of the light guide plate, wherein the angle between the fast axis of the quarter wave plate and the direction of the metal wire grid of the metal wire grid polarizing film is 45°
; anda reflective sheet disposed on the side of the quarter-wave plate facing away from the light guide plate. - View Dependent Claims (2, 3, 5, 6, 7)
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4. A backlight module, comprising
a light guide plate having a light incident surface, a light emitting surface and a reflective surface respectively connected to the light incident surface and opposite to each other; -
a light source provided adjacent to the light incident surface; a metal wire grid polarizing film disposed on a side of the light emitting surface of the light guide plate; a quarter-wave plate disposed adjacent to the reflective surface of the light guide plate, wherein the angle between the fast axis of the quarter wave plate and the direction of the metal wire grid of the metal wire grid polarizing film is 45°
; anda reflective sheet disposed on the side of the quarter-wave plate facing away from the light guide plate. - View Dependent Claims (8)
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9. A liquid crystal display device, comprising a liquid crystal panel and a backlight module to provide light to the liquid crystal panel, wherein the backlight module further comprising:
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a light guide plate having a light incident surface, a light emitting surface and a reflective surface respectively connected to the light incident surface and opposite to each other; a light source provided adjacent to the light incident surface; a metal wire grid polarizing film disposed on a side of the light emitting surface of the light guide plate; a quarter-wave plate disposed adjacent to the reflective surface of the light guide plate, wherein the angle between the fast axis of the quarter wave plate and the direction of the metal wire grid of the metal wire grid polarizing film is 45°
; anda reflective sheet disposed on the side of the quarter-wave plate facing away from the light guide plate. - View Dependent Claims (10, 11, 12, 13)
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Specification