Display unit, method of manufacturing same, organic light emitting unit, and method of manufacturing same

Abstract

A display unit capable of being simply designed and manufactured by using more simplified light emitting device structure while capable of high definition display and display with superior color reproducibility and a manufacturing method thereof are provided. The display unit is a display, wherein a plurality of organic EL devices in which a function layer including a light emitting layer is sandwiched between a lower electrode made of a light reflective material and a semi-transmissive upper electrode, and which has a resonator structure in which light emitted in the light emitting layer is resonated using a space between the lower electrode and the upper electrode as a resonant section and is extracted from the upper electrode side are arranged on a substrate. In the respective organic EL devices, the function layer is made of an identical layer, and an optical distance of the resonant section is set to a value different from each other so that blue, green, or red wavelength region is resonated.

The invention is claimed as follows: 
     
         1 . A display unit comprising a plurality of light emitting devices in which a function layer includes
 at least a light emitting layer between a lower electrode made of a light reflective material and an upper electrode, and   a barrier layer between the light emitting layer and the lower electrode,   wherein a thickness of the barrier layer in each color pixel is respectively different from one another.   
     
     
         2 . The display unit according to  claim 1 , wherein colors of the pixels are at least red, green and blue. 
     
     
         3 . The display unit according to  claim 1 , wherein the thickness corresponds to a resonance of emitted light from the light emitting layer. 
     
     
         4 . The display unit according to  claim 1 , wherein the lower electrode includes a first layer. 
     
     
         5 . The display unit according to  claim 4 , wherein the lower electrode includes a second layer. 
     
     
         6 . The display unit according to  claim 4 , wherein the first layer is made of at least one metal selected from the group consisting of chromium, indium, tin, zinc, cadmium, titanium, aluminum, magnesium, and molybdenum, an alloy of the metal, a metal oxide thereof, and a metal nitride thereof. 
     
     
         7 . The display unit according to  claim 5 , wherein the second layer is made of silver or an alloy containing silver. 
     
     
         8 . The display unit according to  claim 5 , the second layer is made of an alloy containing silver and at least one selected from the group consisting of palladium, neodymium, samarium, yttrium, cerium, europium, gadolinium, terbium, dysprosium, erbium, ytterbium, scandium, ruthenium, copper, and gold. 
     
     
         9 . The display unit according to  claim 1 , wherein the barrier layer is made of a material containing at least one metal selected from the group consisting of indium, tin, zinc, cadmium, titanium, chromium, gallium, and aluminum; an alloy of the metal; a metal oxide thereof; and a metal nitride thereof. 
     
     
         10 . The display unit according to  claim 1 , the barrier layer is made of a material containing at least one metal oxide selected from the group consisting of indium tin oxide, indium zinc oxide, indium oxide, tin oxide, zinc oxide, cadmium oxide, titanium oxide, and chromium oxide. 
     
     
         11 . The display unit according to  claim 1 , wherein the barrier layer is made of a material with a work function larger than that of the resonant layer. 
     
     
         12 . The display unit according to  claim 1 , wherein in the plurality of light emitting devices, the function layer including the light emitting layer is made of an identical layer. 
     
     
         13 . The display unit according to  claim 1 , wherein the light emitting layer emits light in blue, green, and red wavelength regions, and
 in the respective light emitting devices, an optical distance is set so that extraction of light in blue, green, or red wavelength region becomes a maximum, respectively.   
     
     
         14 . The display unit according to  claim 1 , wherein the mirror and the half mirror are used as an electrode. 
     
     
         15 . The display unit according to  claim 1 , wherein a transparent conductive layer is provided between the mirror and the half mirror, and the optical distance is adjusted by the transparent conductive layer. 
     
     
         16 . The display unit according to  claim 1 , wherein where a phase shift generated when light generated in the light emitting layer is reflected on the both ends of the resonant section is cp radian, an optical distance of the resonant section is L, and a peak wavelength of the spectrum of light desired to be extracted among the light is λ, the optical distance L is in a range that satisfies a following formula (1):
   (2 L )/λ+φ/(2π)= m , where  m  is an integer  (1).
 
 
     
     
         17 . The display unit according to  claim 16 , wherein a transparent conductive layer is provided between the mirror and the half mirror, and
 where an optical distance of the transparent conductive layer is Lt, and an optical distance of the function layer including the light emitting layer is Lf, the optical distance Lt of the transparent conductive layer of the respective light emitting devices is set to satisfy a following formula (2):
     Lt=L−Lf   (2).
 
   
     
     
         18 . The display unit according to  claim 1 , wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror. 
     
     
         19 . The display unit according to  claim 12  wherein the light emitting layer emits light in blue, green, and red wavelength regions and,
 in the respective light emitting devices, the optical distance is set so that extraction of light in blue, green, or red wavelength region becomes the maximum, respectively. 
 
     
     
         20 . The display unit according to  claim 19 , wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror. 
     
     
         21 . The display unit according to  claim 19 , wherein the mirror and the half mirror are used as an electrode, and
 a transparent conductive layer is provided between the minor and the half mirror, and the optical distance is adjusted by the transparent conductive layer.   
     
     
         22 . The display unit according to  claim 21 , wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror. 
     
     
         23 . The display unit according to  claim 19 , wherein the mirror and the half mirror are used as an electrode, and
 where a phase shift generated when light generated in the light emitting layer is reflected on the both ends of the resonant section is φ radian, an optical distance of the resonant section is L, and a peak wavelength of the spectrum of light desired to be extracted among the light is λ, the optical distance L is in a range satisfying a following formula (1).
   (2 L )/λ+φ/(2π)= m , where  m  is an integer  (1).
 
   
     
     
         24 . The display unit according to  claim 23 , wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror. 
     
     
         25 . The display unit according to  claim 23 , wherein a transparent conductive layer is provided between the mirror and the half mirror, and
 where an optical distance of the transparent conductive layer is Lt, and an optical distance of the function layer including the light emitting layer is Lf, the optical distance Lt of the transparent conductive layer of the respective light emitting devices is set to meet the following formula (2).
     Lt=L−Lf   (2).
 
   
     
     
         26 . The display unit according to  claim 25 , wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror. 
     
     
         27 . The display unit according to  claim 1 , wherein the reflectance of the half mirror ranges from 0.1% to less than 50%. 
     
     
         28 . The display unit according to  claim 27 , wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror. 
     
     
         29 . The display unit according to  claim 27 , wherein the mirror and the half mirror are used as an electrode, and
 a transparent conductive layer is provided between the mirror and the half mirror, and the optical distance is adjusted by the transparent conductive layer.   
     
     
         30 . The display unit according to  claim 29 , wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror. 
     
     
         31 . The display unit according to  claim 27 , wherein the mirror and the half mirror are used as an electrode, and
 where a phase shift generated when light generated in the light emitting layer is reflected on the both ends of the resonant section is φ radian, an optical distance of the resonant section is L, and a peak wavelength of the spectrum of light desired to be extracted among the light is λ, the optical distance L is in a range satisfying a following formula (1):
   (2 L )/λ+φ/(2π)= m , where  m  is an integer  (1).
 
   
     
     
         32 . The display unit according to  claim 31 , wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror. 
     
     
         33 . The display unit according to  claim 31 , wherein a transparent conductive layer is provided between the mirror and the half mirror, and
 where an optical distance of the transparent conductive layer is Lt, and an optical distance of the function layer including the light emitting layer is Lf, the optical distance Lt of the transparent conductive layer of the respective light emitting devices is set to satisfy a following formula (2):
     Lt=L−Lf   (2).
 
   
     
     
         34 . The display unit according to  claim 33 , wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror. 
     
     
         35 . The display unit according to  claim 27 , wherein a color filter for transmitting light in the wavelength regions, which is resonated in the resonant section and is extracted from the half mirror side is provided above the half mirror,
 the mirror and the half mirror are used as an electrode,   a transparent conductive layer is provided between the mirror and the half mirror,   where a phase shift generated when light generated in the light emitting layer is reflected on the both ends of the resonant section is φ radian, an optical distance of the resonant section is L, and a peak wavelength of the spectrum of light desired to be extracted among the light is λ, the optical distance L is in a range satisfying a following formula (1), and   where an optical distance of the transparent conductive layer is Lt, and an optical distance of the function layer including the light emitting layer is Lf, the optical distance Lt of the transparent conductive layer of the respective light emitting devices is set to satisfy a following formula (2).
   (2 L )/λ+φ/(2π)= m , where  m  is an integer  (1)
 
     Lt=L−Lf   (2).
 
   
     
     
         36 . The display unit according to  claim 35 , wherein the optical distances Lt and Lf in the formula (2) are set so that the value of m in the formula (1) meets m=0 for the light emitting device of the light emitting devices for emitting blue light; m=0 for the light emitting device of the light emitting devices for emitting green light; and m=0 for the light emitting device of the light emitting devices for emitting red light. 
     
     
         37 . The display unit according to  claim 35 , wherein the optical distances Lt and Lf in the formula (2) are set so that the value of m in the formula (1) meets m=1 for the light emitting device of the light emitting devices for emitting blue light; m=0 for the light emitting device of the light emitting devices for emitting green light; and m=0 for the light emitting device of the light emitting devices for emitting red light. 
     
     
         38 . The display unit according to  claim 35 , wherein the optical distances Lt and Lf in the formula (2) are set so that the value of m in the formula (1) meets m=1 for the light emitting device of the light emitting devices for emitting blue light; m=1 for the light emitting device of the light emitting devices for emitting green light; and m=0 for the light emitting device of the light emitting devices for emitting red light. 
     
     
         39 . The display unit according to  claim 35 , wherein the optical distances Lt and Lf in the formula (2) are set so that the value of m in the formula (1) meets m=1 for the light emitting device of the light emitting devices for emitting blue light; m=1 for the light emitting device of the light emitting devices for emitting green light; and m=1 for the light emitting device of the light emitting devices for emitting red light. 
     
     
         40 . The display unit according to  claim 35 , wherein the optical distances Lt and Lf in the formula (2) are set so that the value of m in the formula (1) meets m=2 for the light emitting device of the light emitting devices for emitting blue light; m=1 for the light emitting device of the light emitting devices for emitting green light; and m=1 for the light emitting device of the light emitting devices for emitting red light. 
     
     
         41 . The display unit according to  claim 35 , wherein the optical distances Lt and Lf in the formula (2) are set so that the value of m in the formula (1) meets m=2 for the light emitting device of the light emitting devices for emitting blue light; m=2 for the light emitting device of the light emitting devices for emitting green light; and m=1 for the light emitting device of the light emitting devices for emitting red light. 
     
     
         42 . The display unit according to  claim 35 , wherein the optical distances Lt and Lf in the formula (2) are set so that the value of m in the formula (1) meets m=2 for the light emitting device of the light emitting devices for emitting blue light; m=2 for the light emitting device of the light emitting devices for emitting green light; and m=2 for the light emitting device of the light emitting devices for emitting red light.