BACKLIGHT DEVICE AND LIQUID CRYSTAL DISPLAY APPARATUS

• US 20090135330A1
• Filed: 11/14/2008
• Published: 05/28/2009
• Est. Priority Date: 11/22/2007
• Status: Active Grant

• Current Assignee: Saturn Licensing LLC (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kawase, Mitsuhiro, Shirakuma, Toshiaki
• Granted Patent: US 7,894,014 B2
• Time in Patent Office: Days
• US Class Current: 349/58
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133608 including particular frames or supporting means
• CPC Class Codes: G02F 1/133613 characterized by the sequence of light sources

Abstract

A backlight device that illuminates a transmissive liquid crystal panel is disclosed. The device includes: a plurality of light source substrates on which a plurality of light emitting devices irradiating illumination light are mounted; drive substrates having drive circuits for the light emitting devices and electrically connected to the light source substrates; a bottom chassis having one surface to which the plurality of light source substrates are attached; a reflector having openings corresponding to the light emitting devices and through which the light emitting devices are exposed, and reflecting the illumination light; a diffuser facing the one surface side of the reflector through a predetermined facing interval and internally diffusing the illumination light; and an optical function sheet laminate combined with the diffuser on one surface side thereof, containing a stack of a plurality of optical function sheets and guiding the illumination light to the liquid crystal panel.

Claims

1. A backlight device that illuminates a transmissive liquid crystal panel from the back side, the backlight device comprising:

a plurality of light source substrates on which a plurality of light emitting devices that irradiate illumination light are mounted;

drive substrates having drive circuits for the light emitting devices and electrically connected to the light source substrates;

a bottom chassis having one surface to which the plurality of light source substrates are attached;

a reflector having openings corresponding to the light emitting devices mounted on the light source substrates attached to the bottom chassis, the light emitting devices being exposed to one surface side through the openings, the reflector reflecting the illumination light irradiated from the light emitting devices;

a diffuser facing the one surface side of the reflector through a predetermined facing interval from the reflector and internally diffusing the illumination light incident from the reflector; and

an optical function sheet laminate combined with the diffuser on one surface side thereof, containing a stack of a plurality of optical function sheets and guiding the illumination light to the transmissive liquid crystal panel,

wherein the drive substrates are attached to the one surface of the bottom chassis on the other surface side of the reflector.

2. The backlight device according to claim 1, wherein power devices are mounted on the light source substrates.

3. The backlight device according to claim 2, wherein the light emitting devices are driven in blocks each including the plurality of light emitting devices by the drive substrates.

4. The backlight device according to claim 1, wherein a tuner is mounted on the other surface side of the bottom chassis.

5. A liquid crystal display apparatus comprising:

a transmissive liquid crystal panel; and

a backlight device that illuminates a transmissive liquid crystal panel from the back side, the backlight device having

a plurality of light source substrates on which a plurality of light emitting devices that irradiate illumination light are mounted;

drive substrates having drive circuits for the light emitting devices and electrically connected to the light source substrates;

a bottom chassis having one surface to which the plurality of light source substrates are attached;

a reflector having openings corresponding to the light emitting devices mounted on the light source substrates attached to the bottom chassis, the light emitting devices being exposed to the other surface side through the openings, the reflector reflecting the illumination light irradiated from the light emitting devices;

a diffuser facing the one surface side of the reflector through a predetermined facing interval from the reflector and internally diffusing the illumination light incident from the reflector; and

an optical function sheet laminate combined with the diffuser on one surface side of, containing a stack of a plurality of optical function sheets and guiding the illumination light to the transmissive liquid crystal panel,

wherein the drive substrates are attached to the one surface of the bottom chassis on the other surface side of the reflector.

6. The liquid crystal display apparatus according to claim 5, wherein power devices are mounted on the light source substrates.

7. The liquid crystal display apparatus according to claim 6, wherein the light emitting devices are driven in blocks each including the plurality of light emitting devices by the drive substrates.

8. The liquid crystal display apparatus according to claim 5, wherein a tuner is mounted on the other surface side of the bottom chassis.