Light Emitting Device

Abstract

The invention provides a light emitting device which is capable of displaying on both sides, has a small volume, and is capable of being used as a module. A light emitting element represented by an EL element and the like is used in a pixel portion, and two pixel portions are provided in one light emitting device. A first pixel portion has a structure to emit light only from a counter electrode side of the light emitting element. A second pixel portion has a structure to emit light only from a pixel electrode side of the light emitting element. That is, in the first pixel portion and the second pixel portion, directions of light emission are reverse in front and back.

What is claimed is: 
     
         1 . A semiconductor device comprising:
 a display portion, the display portion comprising:   a first pixel portion in which a plurality of first pixels are arranged in matrix over a substrate, each of the plurality of first pixels comprises a first light emitting element, wherein the first light emitting element comprises a first pixel electrode, a first electroluminescent layer, and a first counter electrode;   a second pixel portion in which a plurality of second pixels are arranged in matrix over the substrate, each of the plurality of second pixels comprises a second light emitting element, wherein the second light emitting element comprises a second pixel electrode, a second electroluminescent layer, and a second counter electrode; and   a driver circuit positioned between the first pixel portion and the second pixel portion,   wherein the first pixel electrode comprises a first reflecting film and the second pixel electrode comprises a transparent film,   wherein the second light emitting element further comprises a second reflecting film over the second counter electrode, and   wherein a direction of light emission of the first pixel portion is different from a direction of light emission of the second pixel portion.   
     
     
         2 . The semiconductor device according to  claim 1 , wherein an area of the first pixel portion is different from an area of the second pixel portion. 
     
     
         3 . The semiconductor device according to  claim 1 , further comprising a protective film over the first counter electrode and the second counter electrode. 
     
     
         4 . The semiconductor device according to  claim 1 , further comprising a protective film between the second counter electrode and the second reflecting film. 
     
     
         5 . The semiconductor device according to  claim 1 , further comprising:
 a first gate signal line driver circuit for operating the first pixel portion;   a second gate signal line driver circuit for operating the second pixel portion; and   a first source signal line driver circuit for operating the first pixel portion,   wherein the driver circuit is a second source signal line driver circuit for operating the second pixel portion.   
     
     
         6 . The semiconductor device according to  claim 5 , further comprising:
 a wiring for supplying a signal or a voltage to the first source signal line driver circuit and the second source signal line driver circuit, and   a means for operating either of the first pixel portion or the second pixel portion.   
     
     
         7 . An electronic apparatus using the semiconductor device according to  claim 1 . 
     
     
         8 . A semiconductor device comprising:
 a display portion, the display portion comprising:   a first pixel portion in which a plurality of first pixels are arranged in matrix over a substrate, each of the plurality of first pixels comprises a first light emitting element, wherein the first light emitting element comprises a first pixel electrode, a first electroluminescent layer, and a first counter electrode;   a second pixel portion in which a plurality of second pixels are arranged in matrix over the substrate, each of the plurality of second pixels comprises a second light emitting element, wherein the second light emitting element comprises a second pixel electrode, a second electroluminescent layer, and a second counter electrode; and   a driver circuit positioned between the first pixel portion and the second pixel portion,   wherein the first pixel electrode comprises a first reflecting film and the second pixel electrode comprises a transparent film,   wherein the second counter electrode comprises a second reflecting film, and   wherein a direction of light emission of the first pixel portion is different from a direction of light emission of the second pixel portion.   
     
     
         9 . The semiconductor device according to  claim 8 , wherein an area of the first pixel portion is different from an area of the second pixel portion. 
     
     
         10 . The semiconductor device according to  claim 8 , further comprising a protective film over the first counter electrode and the second counter electrode. 
     
     
         11 . The semiconductor device according to  claim 8 , further comprising:
 a first gate signal line driver circuit for operating the first pixel portion;   a second gate signal line driver circuit for operating the second pixel portion; and   a first source signal line driver circuit for operating the first pixel portion,   wherein the driver circuit is a second source signal line driver circuit for operating the second pixel portion.   
     
     
         12 . The semiconductor device according to  claim 11 , further comprising:
 a wiring for supplying a signal or a voltage to the first source signal line driver circuit and the second source signal line driver circuit, and   a means for operating either of the first pixel portion or the second pixel portion.   
     
     
         13 . An electronic apparatus using the semiconductor device according to  claim 8 . 
     
     
         14 . A semiconductor device comprising:
 a display portion, the display portion comprising:   a first pixel portion in which a plurality of first pixels are arranged in matrix over a substrate, each of the plurality of first pixels comprises a first light emitting element, wherein the first light emitting element comprises a first pixel electrode, a first electroluminescent layer, and a first counter electrode;   a second pixel portion in which a plurality of second pixels are arranged in matrix over the substrate, each of the plurality of second pixels comprises a second light emitting element, wherein the second light emitting element comprises a second pixel electrode, a second electroluminescent layer, and a second counter electrode; and   a driver circuit positioned between the first pixel portion and the second pixel portion,   wherein the first pixel electrode comprises a first reflecting film and the second pixel electrode comprises a transparent film,   wherein the first light emitting element further comprises a color filter over the first counter electrode,   wherein the second light emitting element further comprises a second reflecting film over the second counter electrode, and   wherein a direction of light emission of the first pixel portion is different from a direction of light emission of the second pixel portion.   
     
     
         15 . The semiconductor device according to  claim 14 , wherein an area of the first pixel portion is different from an area of the second pixel portion. 
     
     
         16 . The semiconductor device according to  claim 14 , further comprising a protective film over the first counter electrode and the second counter electrode. 
     
     
         17 . The semiconductor device according to  claim 14 , further comprising a protective film between the second counter electrode and the second reflecting film. 
     
     
         18 . The semiconductor device according to  claim 14 , further comprising:
 a first gate signal line driver circuit for operating the first pixel portion;   a second gate signal line driver circuit for operating the second pixel portion; and   a first source signal line driver circuit for operating the first pixel portion,   wherein the driver circuit is a second source signal line driver circuit for operating the second pixel portion.   
     
     
         19 . The semiconductor device according to  claim 18 , further comprising:
 a wiring for supplying a signal or a voltage to the first source signal line driver circuit and the second source signal line driver circuit, and   a means for operating either of the first pixel portion or the second pixel portion.   
     
     
         20 . An electronic apparatus using the semiconductor device according to  claim 14 .