Liquid crystal module with top-cut conical supports on the backlight chassis

Abstract

A liquid crystal module includes: a rectangular-frame-shaped mold frame that is provided with a backlight therein; a liquid crystal cell that is arranged on a front face of the mold frame and is illuminated from a rear side by the backlight; a backlight chassis that is made of metal and fixed on a rear face of the backlight via a reflecting sheet made of synthetic resin; a plurality of supports that are formed on the backlight chassis; and a circuit board that is fixed to the supports by screwing, wherein the support is formed in a top-cut conical shape by swelling the backlight chassis backward by being subjected to drawing.

What is claimed is: 
     
       1. A liquid crystal module comprising:
 a rectangular-frame-shaped mold frame that is provided with a backlight therein; 
 a liquid crystal cell that is arranged on a front face of the mold frame and is illuminated from a rear side by the backlight; 
 a backlight chassis that is made of metal and fixed on a rear face of the backlight via a reflecting sheet made of synthetic resin; 
 a plurality of supports that are formed on the backlight chassis; and 
 a circuit board that is fixed to the supports by screwing, 
 wherein the support is formed in a top-cut conical shape by swelling the backlight chassis backward by being subjected to drawing, 
 wherein the supports are grouped into one of a first support and a second support, 
 wherein the first support is formed with a positioning cylindrical portion protruding outward at a top face center thereof, 
 wherein the second support is formed with a fixing cylindrical portion protruding inward at a top face center thereof by burring, 
 wherein the positioning cylindrical portion and the fixing cylindrical portion are provided with a screw hole on an inner circumferential face thereon, and 
 wherein the circuit board is fixed to a reverse face of the backlight chassis by positioning the circuit board by engaging the positioning cylindrical portion to a through-hole formed on the circuit board to concentrically positioning the through-hole to the screw hole, and by screwing a screw into the screw hole. 
 
     
     
       2. A liquid crystal module comprising:
 a rectangular-frame-shaped mold frame that is provided with a backlight therein; 
 a liquid crystal cell that is arranged on a front face of the mold frame and is illuminated from a rear side by the backlight; 
 a backlight chassis that is made of metal and fixed on a rear face of the backlight via a reflecting sheet made of synthetic resin; 
 a plurality of supports that are formed on the backlight chassis; and 
 a first circuit board that is fixed to the supports by screwing, 
 wherein the support is formed in a top-cut conical shape by swelling the backlight chassis backward by being subjected to drawing, and 
 wherein the first circuit board is arranged on the plurality of supports only. 
 
     
     
       3. The liquid crystal module according to  claim 2 ,
 wherein the supports are grouped into one of a first support and a second support, 
 wherein the first support is formed with a positioning cylindrical portion protruding outward at a top face center thereof, 
 wherein the second support is formed with a fixing cylindrical portion protruding inward at a top face center thereof by burring, 
 wherein the positioning cylindrical portion and the fixing cylindrical portion are provided with a screw hole on an inner circumferential face thereon, and 
 wherein the first circuit board is fixed to a reverse face of the backlight chassis by positioning the first circuit board by engaging the positioning cylindrical portion to a through-hole formed on the first circuit board to concentrically positioning the through-hole to the screw hole, and by screwing a screw into the screw hole. 
 
     
     
       4. The liquid crystal module according to claim 2,
 wherein the support comprises opening at a top face of the support, and   wherein the first circuit board is fixed by a screw through the opening.    
     
     
       5. The liquid crystal module according to claim 2, wherein the plurality of supports comprises one or more first supports and one or more second supports of which a shape is different from a shape of the first support.  
     
     
       6. The liquid crystal module according to claim 2, wherein the first circuit board contacts with a top face of the support.  
     
     
       7. The liquid crystal module according to claim 2,
 wherein the support comprises a protruding portion at a top face of the support, and   wherein the first circuit board contacts with the protruding portion.    
     
     
       8. The liquid crystal module according to claim 2,
 wherein the support comprises a protruding portion at a top face of the support, and   wherein the first circuit board comprises opening inserted by the protruding portion.    
     
     
       9. The liquid crystal module according to claim 2,
 wherein at least one of the plurality of supports comprises a protruding portion at a top face of the support, and   wherein the first circuit board contacts with the protruding portion.    
     
     
       10. The liquid crystal module according to claim 9, wherein the at least one of the plurality of supports comprising the protruding portion is disposed near an end portion of the first circuit board.  
     
     
       11. The liquid crystal module according to claim 7,
 wherein the protruding portion comprises opening, and   wherein the first circuit board is fixed by a screw through the opening.    
     
     
       12. The liquid crystal module according to claim 9,
 wherein two of the plurality of supports comprise a protruding portion at a top face of the support, and   wherein the two supports are disposed near one of side edges of the first circuit board.    
     
     
       13. The liquid crystal module according to claim 2, further comprises:
 a second circuit board,   wherein the second circuit board is disposed on a plurality of supports formed in a top-cut conical shape.    
     
     
       14. The liquid crystal module according to claim 13, wherein the second circuit board is a digital circuit board.  
     
     
       15. The liquid crystal module according to claim 13, wherein the first circuit board is a main circuit board.  
     
     
       16. The liquid crystal module according to claim 13, wherein the first circuit board and the second circuit board are disposed on a same plane.  
     
     
       17. The liquid crystal module according to claim 13, wherein a size of the first circuit board is larger than a size of the second circuit board.  
     
     
       18. The liquid crystal module according to claim 17, wherein a number of the supports on which the first circuit board is disposed is larger than a number of the supports on which the second circuit board is disposed.  
     
     
       19. The liquid crystal module according to claim 2, wherein the support is formed on a plane of the backlight chassis that is approximately parallel to a display surface of the liquid crystal cell.  
     
     
       20. The liquid crystal module according to claim 2, wherein holes formed by raising does not exist between the reflecting sheet and the first circuit board.  
     
     
       21. The liquid crystal module according to claim 2,
 wherein the support comprises a cylindrical portion protruding from an opposite face of a top face of the supports,   wherein the first circuit board is fixed by a screw through the cylindrical portion.