Backlight and Display Device

Abstract

A backlight of which power consumption can be reduced is provided. Further, by effective use of light emitted from the backlight, a display device with low power consumption is provided. The display device includes a light source device in which a plurality of light-emitting elements are arranged, a diffusion plate which is bonded to the light source device, a first polarizing plate which is bonded to the diffusion plate, a liquid crystal panel which is bonded to the first polarizing plate, and a second polarizing plate which is bonded to the liquid crystal panel. The light source device includes an organic resin having a projected spherical surface and a light-transmitting property covering each of the plurality of light-emitting elements and an organic resin having a planarized surface and a light-transmitting property covering the plurality of light-emitting elements and the organic resin having a projected spherical surface and a light-transmitting property.

What is claimed is: 
     
         1 - 16 . (canceled) 
     
     
         17 . A display device comprising:
 a light source device in which a plurality of light-emitting elements are arranged;   a pair of light-transmitting substrates which are provided over the light source device;   a reflective layer including an opening portion, which is formed between the pair of light-transmitting substrates;   a movable microstructure including a shutter provided to correspond to the opening portion; and   a transistor which is connected to the movable microstructure,   wherein the light source device comprises:
 a first organic resin having a projected spherical surface and a light-transmitting property covering each of the plurality of light-emitting elements; and 
 a second organic resin having a planarized surface and a light-transmitting property covering the plurality of light-emitting elements and the first organic resin. 
   
     
     
         18 . The display device according to  claim 17 , further comprising a diffusion plate which is bonded to the light source device; 
     
     
         19 . The display device according to  claim 17 , wherein the second organic resin further comprises an object which causes scattering of light. 
     
     
         20 . The display device according to  claim 17 , wherein a light refractive index of the first organic resin is greater than a light refractive index of the second organic resin. 
     
     
         21 . The display device according to  claim 17 , wherein the movable microstructure comprising a shutter includes a first movable electrode which is connected to one side of the shutter, a second movable electrode provided in the vicinity of the first movable electrode, and a spring which is connected to the other side of the shutter. 
     
     
         22 . The display device according to  claim 21 ,
 wherein the first movable electrode and the spring are electrically connected to a common electrode or a ground electrode, and   wherein the second movable electrode is electrically connected to the transistor.   
     
     
         23 . The display device according to  claim 17 , wherein the movable microstructure comprising a shutter is moved in a direction parallel to a surface of the pair of light-transmitting substrates. 
     
     
         24 . The display device according to  claim 17 , wherein the plurality of light-emitting elements comprises a white light-emitting element. 
     
     
         25 . The display device according to  claim 17 ,
 wherein the plurality of light-emitting elements comprise a light-emitting element that emits red light, a light-emitting element that emits green light, and a light-emitting element that emits blue light, and   wherein a field-sequential method for color display is employed in which the light-emitting element that emits red light, the light-emitting element that emits green light, and the light-emitting element that emits blue light are sequentially turned on.   
     
     
         26 . The display device according to  claim 17 , further comprising an optical member over the light source device, 
     
     
         27 . The display device according to  claim 26 , wherein the optical member is an optical member improving luminance. 
     
     
         28 . The display device according to  claim 17 , wherein the transistor comprises a semiconductor film which comprises a channel formation region, the semiconductor film comprising an oxide semiconductor material. 
     
     
         29 . The display device according to  claim 28 , wherein the oxide semiconductor material is an In—Ga—Zn—O-based oxide semiconductor. 
     
     
         30 . A display device comprising:
 a backlight module comprising a plurality of light-emitting elements; and   a plurality of pixels, each comprising a switching element and a MEMS switch for controlling transmittance of light from the backlight module, the MEMS switch comprising a shutter,   wherein the switching element comprises a transistor, the transistor comprising a semiconductor film which comprises a channel formation region, the semiconductor film comprising an oxide semiconductor material.   
     
     
         31 . The display device according to  claim 30 , wherein the oxide semiconductor material is an In—Ga—Zn—O-based oxide semiconductor. 
     
     
         32 . The display device according to  claim 30 , wherein the display device is driven in a field sequential method. 
     
     
         33 . The display device according to  claim 30 , wherein the MEMS switch comprises an actuator coupled with the shutter. 
     
     
         34 . The display device according to  claim 30 , wherein the backlight module comprises a plurality of light emitting diodes. 
     
     
         35 . A display device comprising:
 a plurality of pixels, each comprising a switching element and a MEMS switch for controlling transmittance of light, the MEMS switch comprising a shutter, an actuator connected with one side of the shutter, and a spring connected to the other side of the shutter,   wherein the switching element comprises a transistor, the transistor comprising a semiconductor film which comprises a channel formation region, the semiconductor film comprising an oxide semiconductor material.   
     
     
         36 . The display device according to  claim 35 , wherein the oxide semiconductor material is an In—Ga—Zn—O-based oxide semiconductor. 
     
     
         37 . The display device according to  claim 35 , wherein the display device is driven in a field sequential method.