Backlight module having grating plate and liquid crystal display with same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F21V-009/14
F21V-007/04
F21V-011/02
F21V-007/00
G02F-001/1335
출원번호
UP-0005799
(2007-12-27)
등록번호
US-7748859
(2010-07-26)
우선권정보
TW-95149678 A(2006-12-29)
발명자
/ 주소
Qi, Xiao-Jing
출원인 / 주소
Innocom Technology (Shenzhen) Co., Ltd.
Innolux Display Corp.
대리인 / 주소
Chung, Wei Te
인용정보
피인용 횟수 :
1인용 특허 :
8
초록▼
A backlight module (1) includes a light source (121), a light guide plate (122) and a grating plate (123). The light guide plate includes a light incident surface (1221), a bottom surface (1223) adjacent the light incident surface. The light source is provided adjacent to the light incident surface
A backlight module (1) includes a light source (121), a light guide plate (122) and a grating plate (123). The light guide plate includes a light incident surface (1221), a bottom surface (1223) adjacent the light incident surface. The light source is provided adjacent to the light incident surface of the light guide plate. The grating plate is provided adjacent to the bottom surface of the light guide plate. The grating plate is configured for reflecting light beams and polarizing the light beams.
대표청구항▼
What is claimed is: 1. A backlight module comprising: a light guide plate comprising a light incident surface, a top surface adjacent to the light incident surface, and a bottom surface adjacent to the light incident surface, a light source provided adjacent to the light incident surface of the lig
What is claimed is: 1. A backlight module comprising: a light guide plate comprising a light incident surface, a top surface adjacent to the light incident surface, and a bottom surface adjacent to the light incident surface, a light source provided adjacent to the light incident surface of the light guide plate, and a grating plate provided adjacent to the bottom surface of the light guide plate, the grating plate comprising a base plate and a plurality of sub-wavelength gratings arranged on a surface of the base plate facing the light guide plate, the sub-wavelength gratings reflecting light beams directly to the bottom surface the light guide plate and polarizing the light beams, the reflected light beams are polarized to have parallel polarized directions by the sub-wavelength gratings, are transmitted through the light guide plate, and are directly emitted out of the top surface of the light guide plate, wherein the sub-wavelength gratings are parallel to each other and arranged in a grating period Λ, and the grating period Λ of the sub-wavelength gratings is in a range from about 0.08 μm to about 0.14 μm. 2. The backlight module as claimed in claim 1, wherein each of the sub-wavelength gratings comprises a dielectric layer extending from a surface of the base plate facing the light guide plate and a metal layer provided on a surface of the dielectric layer facing the light guide plate. 3. The backlight module as claimed in claim 2, wherein the dielectric layer is made from silicon dioxide. 4. The backlight module as claimed in claim 2, wherein a height d1 of the metal layer is in a range from about 0.0556 μm to about 0.0973 μm, and a height d2 of the dielectric layer is in a range from about 0.11 μm to about 0.1925 μm. 5. A liquid crystal display comprising a liquid crystal panel and a backlight module parallel to the liquid crystal panel, the backlight module comprising: a light guide plate comprising a light incident surface, a top surface adjacent to the light incident surface, and a bottom surface adjacent to the light incident surface, a light source provided adjacent to the light incident surface of the light guide plate, and a grating plate provided adjacent to the bottom surface of the light guide plate, the grating plate comprising a base plate and a plurality of sub-wavelength gratings arranged on a surface of the base plate facing the light guide plate, the sub-wavelength gratings reflecting light beams directly to the bottom surface of the light guide plate and polarizing the light beams, the reflected light beams are polarized to have parallel polarized directions by the sub-wavelength gratings, are transmitted through the light guide plate, and are directly emitted out of the top surface of the light guide plate to be provided to the liquid crystal panel, wherein the sub-wavelength gratings are parallel to each other and arranged in a grating period Λ, and the grating period Λ of the sub-wavelength gratings is in a range from about 0.08 μm to about 0.14 μm. 6. The liquid crystal display as claimed in claim 5, wherein each of the sub-wavelength gratings comprises a dielectric layer extending from a surface of the base plate facing the light guide plate and a metal layer provided on a surface of the dielectric layer facing the light guide plate. 7. The liquid crystal display as claimed in claim 6, wherein the dielectric layer is made from silicon dioxide. 8. The liquid crystal display as claimed in claim 6, wherein a height d1 of the metal layer is in a range from about 0.0556 μm to about 0.0973 μm, and a height d2 of the dielectric layer is in a range from about 0.11 μm to about 0.1925 μm. 9. The liquid crystal display as claimed in claim 5, wherein the liquid crystal panel further comprises a polarizer adjacent to the backlight module, and a polarization axis of the polarizer is parallel to polarization directions of the light beams reflected by the grating plate.
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이 특허에 인용된 특허 (8)
Hsu,Shih Chia; Huang,Jyh Haur, Backlight module capable of interchanging polarized states of light.
Perkins Raymond T. ; Hansen Douglas P. ; Gardner Eric W. ; Thorne James M. ; Robbins Arthur A., Broadband wire grid polarizer for the visible spectrum.
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