Backlight device and liquid crystal display apparatus

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; 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 to one surface side, and 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 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.

What is claimed is: 
     
       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;   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 reflector is directly attached to the one surface of the bottom chassis, and the light source substrates are pushed against the bottom chassis.   
     
     
       2. The backlight device according to  claim 1 , wherein the light source substrates are metal core substrates. 
     
     
       3. The backlight device according to  claim 2 . wherein the a plurality of light source substrates are connected through a wiring member; and
 the wiring member is a metal core substrate.   
     
     
       4. The backlight device according to  claim 3 , wherein the reflector is adhered to one surface of the bottom chassis with an adhesive tape on the one surface of the bottom chassis. 
     
     
       5. The backlight device according to  claim 4 , wherein the reflector further pushes the light source substrates against the bottom chassis through a pushing member. 
     
     
       6. The backlight device according to  claim 5 . wherein:
 the pushing member is a magnet; and   the magnet placed one surface of the reflector magnetically attracts the bottom chassis through the light source substrates so that the reflector can push the light source substrates against the bottom chassis.   
     
     
       7. The backlight device according to  claim 5 , wherein:
 the pushing member is a connecting member; and   the connecting member connects to the bottom chassis through the light source substrates so that the reflector can push the light source substrates against the bottom chassis.   
     
     
       8. A liquid crystal display apparatus comprising:
 a transmissive liquid crystal panel; and   a backlight device that illuminates the 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;   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 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 the 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 reflector is directly attached to one surface of the bottom chassis, and the light source substrates are pushed against the bottom chassis.   
     
     
       9. The liquid crystal display apparatus according to  claim 8 , wherein the light source substrates are metal core substrates. 
     
     
       10. The liquid crystal display apparatus according to  claim 9 , wherein the plurality of light source substrates are connected through a wiring member; and
 the wiring member is a metal core substrate.   
     
     
       11. The liquid crystal display apparatus according to  claim 10 , wherein the reflector is adhered to one surface of the bottom chassis with an adhesive tape on the one surface of the bottom chassis. 
     
     
       12. The liquid crystal display apparatus according to  claim 11 , wherein the reflector further pushes the light source substrates against the bottom chassis through a pushing member. 
     
     
       13. The liquid crystal display apparatus according to  claim 12 , wherein:
 the pushing member is a magnet; and   the magnet placed one surface of the reflector magnetically attracts the bottom chassis through the light source substrates so that the reflector can push the light source substrates against the bottom chassis.   
     
     
       14. The liquid crystal display apparatus according to  claim 12 , wherein:
 the pushing member is a connecting member; and   the connecting member connects to the bottom chassis through the light source substrates so that the reflector can push the light source substrates against the bottom chassis.   
     
     
       15. A light source device, comprising:
 light source substrates each with light sources thereon;   a bottom chassis with a main surface on which the light source substrates are directly mounted;   a reflector with a first surface facing away from the bottom chassis and a second surface facing the bottom chassis, the reflector having openings which respectively correspond to the light sources;   an optical function sheet laminate; and   a diffuser between the optical function sheet laminate and the reflector,   wherein,
 each light source substrate has a wiring pattern on an insulating layer, 
 the reflector is attached to the bottom chassis, and 
 each light source substrate is plate shaped, has flexibility and is bendable in accordance with a form of the main surface of the bottom chassis, and is kept in intimate contact with the main surface of the bottom chassis by pushing that includes pushing by the reflector. 
   
     
     
       16. The light source device of claim 15, wherein the optical sheet laminate has a plurality of optical sheets, one of which optical function sheets is a brightness enhancement sheet. 
     
     
       17. The light source device of claim 15, wherein the optical sheet laminate has a plurality of optical sheets, one of which optical function sheets is a prism sheet. 
     
     
       18. The light source device of claim 15, wherein the diffuser is adjacent the optical sheet laminate. 
     
     
       19. The light source device of claim 15, wherein:
 the bottom chassis has a wall that extends from the main surface of the bottom chassis, and   an outer circumferential edge part of the reflector is attached to the wall.   
     
     
       20. The light source device of claim 15, further comprising adhesive or an adhesive tape between each light source substrate and the main surface of the bottom chassis. 
     
     
       21. The light source device of claim 15, further comprising an optical stud member, wherein:
 the optical stud member defines an interval between the diffuser and the reflector,   the optical stud member has a body and an attachment part,   the optical stud member body has a pointed end abutting a surface of the diffuser and defines the interval between the diffuser and the reflector.   
     
     
       22. A liquid crystal display apparatus comprising:
 a liquid crystal panel; and   a light source device as set forth in claim 15.   
     
     
       23. The liquid crystal display apparatus of claim 22, wherein the optical sheet laminate has a plurality of optical sheets, one of which optical function sheets is a brightness enhancement sheet. 
     
     
       24. The liquid crystal display apparatus of claim 22, wherein the optical sheet laminate has a plurality of optical sheets, one of which optical function sheets is a prism sheet. 
     
     
       25. The liquid crystal display apparatus of claim 22, wherein the diffuser is adjacent the optical sheet laminate. 
     
     
       26. The liquid crystal display apparatus of claim 25, wherein the diffuser faces the first surface of the reflector with a facing interval between them. 
     
     
       27. The liquid crystal display apparatus of claim 22, wherein:
 the bottom chassis has a wall that extends from the main surface of the bottom chassis, and   an outer circumferential edge part of the reflector is attached to the wall.   
     
     
       28. The liquid crystal display apparatus of claim 22, further comprising adhesive or adhesive tape between each light source substrate and the main surface of the bottom chassis. 
     
     
       29. The liquid crystal display apparatus of claim 26, further comprising an optical stud member, wherein:
 the optical stud member defines the facing interval between the diffuser and the reflector,   the optical stud member has a body and an attachment part,   the optical stud member body has the pointed end abutting the surface of the diffuser and defines the facing interval between the diffuser and the reflector.   
     
     
       30. A liquid crystal display apparatus comprising (a) a transmissive liquid crystal panel and (b) a backlight device to illuminate the 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 can radiate illumination light are mounted;   a bottom chassis having a surface on which the plurality of light source substrates are mounted;   a reflector to reflect at least some of the illumination light radiated from the light emitting devices, the reflector having a first surface side facing away from the bottom chassis and a second surface side facing the bottom chassis, the reflector having openings corresponding to the light emitting devices, the light emitting devices being exposed to the first surface side of the reflector through the openings;   a diffuser to internally diffuse the illumination light radiated by the light emitting devices and reflected by the reflector, the diffuser facing the first surface side of the reflector; and   an optical sheet laminate to guide the illumination light to the transmissive liquid crystal panel, the diffuser being adjacent a surface side of the optical sheet laminate, wherein,   the reflector is attached to the bottom chassis,   the diffuser is between the optical sheet laminate and the reflector, and   each light source substrate is plate shaped, has flexibility and is bendable in accordance with a form of the one surface of the bottom chassis, and is kept in intimate contact with the one surface of the bottom chassis by pushing which includes pushing by the reflector.   
     
     
       31. The liquid crystal display apparatus according to claim 30, wherein the light source substrates are metal core substrates. 
     
     
       32. The liquid crystal display apparatus according to claim 30, wherein:
 the plurality of light source substrates are connected through a wiring member; and   each light source substrate comprises a metal core substrate carrying an insulating layer and a conductive layer.   
     
     
       33. The liquid crystal display apparatus according to claim 30, wherein the reflector is adhered to the bottom chassis with an adhesive tape on the one surface of the bottom chassis. 
     
     
       34. The liquid crystal display apparatus according to claim 30, wherein the reflector pushes the light source substrates against the bottom chassis using a pushing member. 
     
     
       35. The liquid crystal display apparatus according to claim 34, wherein:
 the pushing member is a magnet; and   the magnet is on the first surface side of the reflector and is magnetically attracted to the bottom chassis through the light source substrates so that the reflector can push the light source substrates against the bottom chassis.   
     
     
       36. The liquid crystal display apparatus according to claim 34, wherein:
 the pushing member is a connecting member; and   the connecting member connects to the bottom chassis through the light source substrates so that the reflector can push the light source substrates against the bottom chassis.