Display device

Abstract

To display a high-quality video regardless of a usage environment. To provide a display device which is lightweight and less likely to be broken. To reduce power consumption of the display device. The display device includes a first display element, a first transistor connected to the first display element, a second display element, and a second transistor connected to the second display element. The first display element is a reflective display element. The first display element and the first transistor are bonded to the second display element and the second transistor with an adhesive layer. Light from the second display element is extracted to the display surface on the first display element side. The light is condensed or guided by a light-condensing means or a light-guiding means provided in a path of the light from the second display element to the display surface.

1 . (canceled) 
     
     
         2 . A display device comprising:
 a first substrate;   a first transistor over the first substrate;   a light-emitting element over the first substrate, the light-emitting element being electrically connected to the first transistor;   a light-condensing means over the light-emitting element; and   a liquid crystal element over the light-condensing means, the liquid crystal element comprising a pixel electrode comprising a first conductive layer and a second conductive layer,   wherein the first conductive layer is configured to reflect visible light, and   wherein the second conductive layer is configured to transmit visible light.   
     
     
         3 . The display device according to  claim 2 , wherein the light-condensing means has a tapered shape. 
     
     
         4 . The display device according to  claim 2 , further comprising a coloring layer in contact with a bottom surface of the light-condensing means. 
     
     
         5 . The display device according to  claim 2 , further comprising a second substrate over the liquid crystal element,
 wherein light from the light-emitting element is extracted outside of the display device through the second substrate.   
     
     
         6 . The display device according to  claim 2 ,
 wherein the first transistor comprises a channel formation region comprising an oxide semiconductor.   
     
     
         7 . The display device according to  claim 2 , further comprising a second transistor electrically connected to the liquid crystal element. 
     
     
         8 . A display device comprising:
 a first substrate;   a first transistor over the first substrate;   a light-emitting element over the first substrate, the light-emitting element being electrically connected to the first transistor;   a first insulating layer over the light-emitting element;   a second insulating layer covering a side surface of the first insulating layer; and   a liquid crystal element over the first insulating layer, the liquid crystal element comprising a pixel electrode comprising a first conductive layer and a second conductive layer,   wherein a refractive index of the first insulating layer is higher than a refractive index of the second insulating layer,   wherein the first conductive layer is configured to reflect visible light, and   wherein the second conductive layer is configured to transmit visible light.   
     
     
         9 . The display device according to  claim 8 ,
 wherein the first insulating layer comprises SiC, TiO 2 , ZnS, CeO 2 , or an indium tin oxide, and   wherein the second insulating layer comprises silicon oxide, CaF 2 , MgF 2 , acrylic, or a fluorine resin.   
     
     
         10 . The display device according to  claim 8 , wherein the first insulating layer has a tapered shape. 
     
     
         11 . The display device according to  claim 8 , further comprising a coloring layer in contact with a bottom surface of the first insulating layer. 
     
     
         12 . The display device according to  claim 8 , further comprising a second substrate over the liquid crystal element,
 wherein light from the light-emitting element is extracted outside of the display device through the second substrate.   
     
     
         13 . The display device according to  claim 8 ,
 wherein the first transistor comprises a channel formation region comprising an oxide semiconductor.   
     
     
         14 . The display device according to  claim 8 , further comprising a second transistor electrically connected to the liquid crystal element. 
     
     
         15 . A display device comprising:
 a first substrate;   a first transistor over the first substrate;   a light-emitting element over the first substrate, the light-emitting element being electrically connected to the first transistor;   an insulating layer over the light-emitting element;   a metal film covering a side surface of the insulating layer; and   a liquid crystal element over the insulating layer, the liquid crystal element comprising a pixel electrode comprising a first conductive layer and a second conductive layer,   wherein the first conductive layer is configured to reflect visible light, and   wherein the second conductive layer is configured to transmit visible light.   
     
     
         16 . The display device according to  claim 15 , wherein the insulating layer has a tapered shape. 
     
     
         17 . The display device according to  claim 15 , further comprising a coloring layer in contact with a bottom surface of the insulating layer. 
     
     
         18 . The display device according to  claim 15 , further comprising a second substrate over the liquid crystal element,
 wherein light from the light-emitting element is extracted outside of the display device through the second substrate.   
     
     
         19 . The display device according to  claim 15 ,
 wherein the first transistor comprises a channel formation regions comprising an oxide semiconductor.   
     
     
         20 . The display device according to  claim 15 , further comprising:
 a second transistor electrically connected to the liquid crystal element.