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 a back side of the liquid crystal panel, the backlight device comprising:
 a plurality of light source substrates on each of which a plurality of light emitting devices that irradiate radiate illumination light are mounted; 
 a bottom chassis having one a main surface to on which the plurality of light source substrates are attached directly mounted; 
 a reflector having openings corresponding to the plurality of light emitting devices mounted on the plurality of light source substrates attached to directly mounted on the bottom chassis, the plurality of light emitting devices being exposed to one surface side through the openings, the reflector reflecting the illumination light irradiated from the plurality of light emitting devices; 
 a diffuser facing the one surface side of the reflector through a predetermined with a facing interval from the reflector and internally therebetween, the diffuser diffusing the illumination light incident from reflected by the reflector; and 
 an optical function sheet laminate combined with the diffuser on one surface side thereof, of the diffuser and containing a stack of a plurality of optical function sheets and guiding that guide the illumination light from the diffuser to the transmissive liquid crystal panel, 
 wherein, 
 the reflector is directly attached to the one main surface of the bottom chassis, and 
 each light source substrate has a plate shape and a wiring pattern on an insulating layer, 
 theeach light source substrates aresubstrate has flexibility and is pushed againstinto direct intimate contact with the main surface of the bottom chassis to be in accordance with a form of the bottom chassis, and 
 the reflector is bent such that a part of the reflector is at an oblique angle with respect to the main surface of the bottom chassis. 
 
 
     
     
       2. The backlight device according to  claim 1 , wherein the plurality of 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 the main surface of the bottom chassis with an adhesive tape on the one main surface of the bottom chassis. 
     
     
       5. The backlight device according to  claim 4 , wherein the reflector further pushes the plurality of light source substrates against the main surface of the bottom chassis through via a pushing member. 
     
     
       6. The backlight device according to  claim 5 , wherein:
 the pushing member is a magnet; and 
 the magnet is placed one on a surface of the reflector and magnetically attracts the bottom chassis through the plurality of light source substrates so that the reflector can push the plurality of light source substrates against the main surface of the bottom chassis. 
 
     
     
       7. The backlight device according to  claim 5 , wherein:
 the pushing member is a connecting member includes connecting members; and 
 the connecting member connects members connect to the bottom chassis through the plurality of light source substrates so that the reflector can push the plurality of light source substrates against the main surface of 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. The light source device of claim 1, wherein the surface of the bottom chassis has projections, the projections being in contact with the reflector. 
     
     
       16. The backlight device according to claim 1, wherein the reflector further pushes the plurality of light source substrates against the main surface of the bottom chassis by means of screws. 
     
     
       17. The backlight device according to claim 1, wherein the reflector is directly attached to the bottom chassis by means of screws. 
     
     
       18. A liquid crystal device comprising the backlight device and the transmissive liquid crystal panel according to claim 1. 
     
     
       19. A liquid crystal display apparatus comprising:
 (a) a liquid crystal panel; and   (b) a backlight device, the backlight device including
 (1) at least one light source substrate having a plurality of light sources thereon, 
 (2) a bottom chassis having a main surface facing the liquid crystal panel and on which the at least one light source substrate is directly mounted, 
 (3) a reflector having a first surface facing the liquid crystal panel and a second surface facing the bottom chassis, the reflector having at least an opening, the opening aligning with one of the plurality of light sources, 
   wherein,
 the reflector is attached to the bottom chassis, 
 the at least one light source substrate has flexibility and is in direct contact with the main surface of the bottom chassis, 
 the reflector is bent such that a part of the reflector is at an oblique angle with respect to the main surface of the bottom chassis, and 
 the reflector is secured to the bottom chassis by means of a tape with adhesive. 
   
     
     
       20. The liquid crystal display apparatus of claim 19, further comprising a diffuser facing the first surface of the reflector with a facing interval therebetween. 
     
     
       21. The liquid crystal display apparatus of claim 19, 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.   
     
     
       22. The liquid crystal display apparatus of claim 20, further comprising:
 a plurality of optical function sheets between the diffuser and the liquid crystal panel, the plurality of optical function sheets being effective to guide light from the plurality of light sources toward the liquid crystal panel,   wherein,
 the plurality of optical function sheets are stacked to form a laminate and guide illumination light from the diffuser. 
   
     
     
       23. A liquid crystal display apparatus comprising:
 (a) a liquid crystal panel; and   (b) a backlight device, the backlight device including
 (1) at least one light source substrate having a plurality of light sources thereon, 
 (2) a bottom chassis having a main surface facing the liquid crystal panel and on which the at least one light source substrate is directly mounted, 
 (3) a reflector having a first surface facing the liquid crystal panel and a second surface facing the bottom chassis, the reflector having at least an opening, the opening aligning with one of the plurality of light sources, 
   wherein,
 the reflector is attached to the bottom chassis, 
 the at least one light source substrate has flexibility and is in direct contact with the main surface of the bottom chassis, and 
 the reflector is bent such that a part of the reflector is at an oblique angle with respect to the main surface of the bottom chassis, and 
 the reflector has a magnet on the first surface of the reflector, the magnet being configured to magnetically attract the bottom chassis through the at least one light source substrate. 
   
     
     
       24. A light source device, comprising:
 (a) at least one light source substrate with a plurality of light sources thereon,   (b) a bottom chassis with a surface on which the at least one light source substrate is directly mounted,   (c) a reflector with a first surface facing away from the bottom chassis and a second surface facing the bottom chassis, the reflector having at least an opening, the opening corresponding to one of the plurality of light sources,   wherein,
 the reflector is mounted on the bottom chassis, 
 the at least one light source substrate has flexibility and is held in direct contact with the main surface of the bottom chassis, 
 the reflector is bent such that a part of the reflector is at an oblique angle with respect to the main surface of the bottom chassis, and 
 a magnet on the first surface of the reflector, the magnet being configured to magnetically attract the bottom chassis through the at least one light source substrate. 
   
     
     
       25. The light source device of claim 24, 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.   
     
     
       26. The light source device of claim 24, wherein the at least one light source substrate is held in direct contact with the main surface of the bottom chassis by the reflector. 
     
     
       27. The light source device of claim 25, wherein a vertex of the oblique angle of the reflector is spaced from the wall of the bottom chassis.