Electronic apparatus

Abstract

It is an object of the invention to achieve weight saving and downsizing of an electronic apparatus, in particular a portable electronic apparatus while enlarging a display screen thereof. The invention provides an electronic apparatus using a light emitting device which includes a light emitting element, a color filter provided on either side of an anode or a cathode of the light emitting element, and two polarizers sandwiching the light emitting element and the color filter, in which the anode and the cathode transmit light, deflection angles of the two polarizers are different from each other, and light obtained from the light emitting element is white.

1 . An electronic apparatus comprising: 
 a light emitting element;    a color filter provided in either side of an anode or a cathode of the light emitting element; and    two polarizers sandwiching the light emitting element and the color filter,    wherein the anode and the cathode transmit light,    wherein deflection angles of the two polarizers are different from each other, and    wherein light obtained from the light emitting element is white.    
     
     
         2 . An electronic apparatus according to  claim 1 , wherein the light emitting element comprises a first light emitting layer which exhibits blue emission and a second light emitting layer dispersed with a phosphorescent material with a concentration of 10 wt % or more in a host material, and exhibiting both phosphorescence from the phosphorescent material and emission from the phosphorescent material in the excimer state.  
     
     
         3 . An electronic apparatus according to  claim 2 , wherein the highest peak in the emission spectrum of the first light emitting layer is located in the region from 400 nm to 500 nm.  
     
     
         4 . An electronic apparatus according to  claim 2 , wherein the phosphorescent material exhibits emission having two or more peaks in the region from 500 nm to 700 nm, and one of the two or more peaks corresponds to the excimer emission.  
     
     
         5 . An electronic apparatus according to  claim 1 , wherein the electronic apparatus is used in a portable information terminal, a portable phone, or an electronic book.  
     
     
         6 . An electronic apparatus comprising: 
 a light emitting element;    two color filters sandwiching the light emitting element; and    two polarizers sandwiching the light emitting element and the two color filters, wherein an anode and a cathode transmit light, wherein deflection angles of the two polarizers are different from each other, and wherein light obtained from the light emitting element is white.    
     
     
         7 . An electronic apparatus according to  claim 6 , wherein the light emitting element comprises a first light emitting layer which exhibits blue emission and a second light emitting layer dispersed with a phosphorescent material with a concentration of 10 wt % or more in a host material, and exhibiting both phosphorescence from the phosphorescent material and emission from the phosphorescent material in the excimer state.  
     
     
         8 . An electronic apparatus according to  claim 7 , wherein the highest peak in the emission spectrum of the first light emitting layer is located in the region from 400 nm to 500 nm.  
     
     
         9 . An electronic apparatus according to  claim 7 , wherein the phosphorescent material exhibits emission having two or more peaks in the region from 500 nm to 700 nm, and one of the two or more peaks corresponds to the excimer emission.  
     
     
         10 . An electronic apparatus according to  claim 6 , wherein the electronic apparatus is used in a portable information terminal, a portable phone, or an electronic book.  
     
     
         11 . An electronic apparatus comprising: 
 a light emitting element;    a first transistor for determining a current value supplied to the light emitting element;    a second transistor for selecting emission or non-emission of the light emitting element;    a color filter provided in either side of an anode or a cathode of the light emitting element; and    two polarizers sandwiching the light emitting element and the color filter,    wherein the anode and the cathode transmit light,    wherein deflection angles of the two polarizers are different from each other,    wherein light obtained from the light emitting element is white,    wherein the first transistor and the second transistor are connected in series between a first power supply and the light emitting element, and    wherein a gate of the first transistor is connected to the first power supply.    
     
     
         12 . An electronic apparatus according to  claim 11 , wherein the light emitting element comprises a first light emitting layer which exhibits blue emission and a second light emitting layer dispersed with a phosphorescent material with a concentration of 10 wt % or more in a host material, and exhibiting both phosphorescence from the phosphorescent material and emission from the phosphorescent material in the excimer state.  
     
     
         13 . An electronic apparatus according to  claim 12 , wherein the highest peak in the emission spectrum of the first light emitting layer is located in the region from 400 nm to 500 nm.  
     
     
         14 . An electronic apparatus according to  claim 12 , wherein the phosphorescent material exhibits emission having two or more peaks in the region from 500 nm to 700 nm, and one of the two or more peaks corresponds to the excimer emission.  
     
     
         15 . An electronic apparatus according to  claim 11 , wherein the electronic apparatus is used in a portable information terminal, a portable phone, or an electronic book.  
     
     
         16 . An electronic apparatus comprising: 
 a light emitting element;    a first transistor for determining a current value supplied to the light emitting element;    a second transistor for selecting emission or non-emission of the light emitting element;    two color filters sandwiching the light emitting element; and    two polarizers sandwiching the light emitting element and the two color filters,    wherein an anode and a cathode transmit light,    wherein deflection angles of the two polarizers are different from each other,    wherein light obtained from the light emitting element is white,    wherein the first transistor and the second transistor are connected in series between a first power supply and the light emitting element and    wherein a gate of the first transistor is connected to the first power supply.    
     
     
         17 . An electronic apparatus according to  claim 16 , wherein the light emitting element comprises a first light emitting layer which exhibits blue emission and a second light emitting layer dispersed with a phosphorescent material with a concentration of 10 wt % or more in a host material, and exhibiting both phosphorescence from the phosphorescent material and emission from the phosphorescent material in the excimer state.  
     
     
         18 . An electronic apparatus according to  claim 17 , wherein the highest peak in the emission spectrum of the first light emitting layer is located in the region from 400 nm to 500 nm.  
     
     
         19 . An electronic apparatus according to  claim 17 , wherein the phosphorescent material exhibits emission having two or more peaks in the region from 500 nm to 700 nm, and one of the two or more peaks corresponds to the excimer emission.  
     
     
         20 . An electronic apparatus according to  claim 16 , wherein the electronic apparatus is used in a portable information terminal, a portable phone, or an electronic book.  
     
     
         21 . An electronic apparatus comprising: 
 a light emitting element;    a color filter provided in either side of an anode or a cathode of the light emitting element; and    two liquid crystal panels sandwiching the light emitting element and the color filter,    wherein the anode and the cathode transmit light, and    wherein light obtained from the light emitting element is white.    
     
     
         22 . An electronic apparatus according to  claim 21 , wherein the light emitting element comprises a first light emitting layer which exhibits blue emission and a second light emitting layer dispersed with a phosphorescent material with a concentration of 10 wt % or more in a host material, and exhibiting both phosphorescence from the phosphorescent material and emission from the phosphorescent material in the excimer state.  
     
     
         23 . An electronic apparatus according to  claim 22 , wherein the highest peak in the emission spectrum of the first light emitting layer is located in the region from 400 nm to 500 nm.  
     
     
         24 . An electronic apparatus according to  claim 22 , wherein the phosphorescent material exhibits emission having two or more peaks in the region from 500 nm to 700 nm, and one of the two or more peaks corresponds to the excimer emission.  
     
     
         25 . An electronic apparatus according to  claim 21 , wherein the electronic apparatus is used in a portable information terminal, a portable phone, or an electronic book.  
     
     
         26 . An electronic apparatus comprising: 
 a light emitting element;    two color filters sandwiching the light emitting element; and    two liquid crystal panels sandwiching the light emitting element and the two color filters;    wherein an anode and a cathode transmit light, and    wherein light obtained from the light emitting element is white.    
     
     
         27 . An electronic apparatus according to  claim 26 , wherein the light emitting element comprises a first light emitting layer which exhibits blue emission and a second light emitting layer dispersed with a phosphorescent material with a concentration of 10 wt % or more in a host material, and exhibiting both phosphorescence from the phosphorescent material and emission from the phosphorescent material in the excimer state.  
     
     
         28 . An electronic apparatus according to  claim 27 , wherein the highest peak in the emission spectrum of the first light emitting layer is located in the region from 400 nm to 500 nm.  
     
     
         29 . An electronic apparatus according to  claim 27 , wherein the phosphorescent material exhibits emission having two or more peaks in the region from 500 nm to 700 nm, and one of the two or more peaks corresponds to the excimer emission.  
     
     
         30 . An electronic apparatus according to  claim 26 , wherein the electronic apparatus is used in a portable information terminal, a portable phone, or an electronic book.  
     
     
         31 . An electronic apparatus comprising: 
 a light emitting element;    a first transistor for determining a current value supplied to the light emitting element;    a second transistor for selecting emission or non-emission of the light emitting element;    a color filter provided in either side of an anode or a cathode of the light emitting element; and    two liquid crystal panels sandwiching the light emitting element and the color filter,    wherein the anode and the cathode transmit light,    wherein light obtained from the light emitting element is white,    wherein the first transistor and the second transistor are connected in series between a first power supply and the light emitting element, and    wherein a gate of the first transistor is connected to the first power supply.    
     
     
         32 . An electronic apparatus according to  claim 31 , wherein the light emitting element comprises a first light emitting layer which exhibits blue emission, and a second light emitting layer dispersed with a phosphorescent material with a concentration of 10 wt % or more in a host material, and exhibiting both phosphorescence from the phosphorescent material and emission from the phosphorescent material in the excimer state.  
     
     
         33 . An electronic apparatus according to  claim 32 , wherein the highest peak in the emission spectrum of the first light emitting layer is located in the region from 400 nm to 500 nm.  
     
     
         34 . An electronic apparatus according to  claim 32 , wherein the phosphorescent material exhibits emission having two or more peaks in the region from 500 nm to 700 nm, and one of the two or more peaks corresponds to the excimer emission.  
     
     
         35 . An electronic apparatus according to  claim 31 , wherein the electronic apparatus is used in a portable information terminal, a portable phone, or an electronic book.  
     
     
         36 . An electronic apparatus comprising: 
 a light emitting element;    a first transistor for determining a current value supplied to the light emitting element;    a second transistor for selecting emission or non-emission of the light emitting element;    two color filters sandwiching the light emitting element; and    two liquid crystal panels sandwiching the light emitting element and the two color filters,    wherein an anode and a cathode transmit light,    wherein light obtained from the light emitting element is white,    wherein the first transistor and the second transistor are connected in series between a first power supply and the light emitting element and    wherein a gate of the first transistor is connected to the first power supply.    
     
     
         37 . An electronic apparatus according to  claim 36 , wherein the light emitting element comprises a first light emitting layer which exhibits blue emission and a second light emitting layer dispersed with a phosphorescent material with a concentration of 10 wt % or more in a host material, and exhibiting both phosphorescence from the phosphorescent material and emission from the phosphorescent material in the excimer state.  
     
     
         38 . An electronic apparatus according to  claim 37 , wherein the highest peak in the emission spectrum of the first light emitting layer is located in the region from 400 nm to 500 nm.  
     
     
         39 . An electronic apparatus according to  claim 37 , wherein the phosphorescent material exhibits emission having two or more peaks in the region from 500 nm to 700 nm, and one of the two or more peaks corresponds to the excimer emission.  
     
     
         40 . An electronic apparatus according to  claim 36 , wherein the electronic apparatus is used in a portable information terminal, a portable phone, or an electronic book.