An organic light emitting display device comprising: a substrate; a pixel having a first subpixel, a second subpixel, and a third subpixel, wherein each of the first subpixel, the second subpixel, and the third subpixel includes: a first electrode including a reflective metal material, wherein the first electrode is a bottom electrode; an organic light emitting layer disposed on the first electrode, a second electrode disposed on the organic light emitting layer and formed of a transparent metal material, and a semi-transmissive electrode disposed on the second electrode, wherein the first subpixel further includes: a first part of a photo-reactive organic film disposed between the second electrode of the first subpixel and the semi-transmissive electrode, and a first optical auxiliary layer disposed between the first part of the photo-reactive organic film and the semi-transmissive electrode, wherein the second subpixel further includes: a second part of the photo-reactive organic film disposed between the second electrode of the second subpixel and the semi-transmissive electrode, and a second optical auxiliary layer disposed between the second part of the photo-reactive organic film and the semi-transmissive electrode, and wherein the third subpixel further includes: a third part of the photo-reactive organic film disposed between the second electrode of the third subpixel and the semi-transmissive electrode, and a third optical auxiliary layer disposed between the third part of the photo-reactive organic film and the semi-transmissive electrode, wherein a first distance between the first electrode and the semi-transmissive electrode of the first subpixel, a second distance between the first electrode and the semi-transmissive electrode of the second subpixel, and a third distance between the first electrode and the semi-transmissive electrode of the third subpixel are different from one another, and wherein a thickness of the first optical auxiliary layer, a thickness of the second optical auxiliary layer, and a thickness of the third optical auxiliary layer are different from one another, characterized in that: the photo-reactive organic film includes diarylethene molecules. a substrate; a pixel having a first subpixel, a second subpixel, and a third subpixel, wherein each of the first subpixel, the second subpixel, and the third subpixel includes: a first electrode including a reflective metal material, wherein the first electrode is a bottom electrode; an organic light emitting layer disposed on the first electrode, a second electrode disposed on the organic light emitting layer and formed of a transparent metal material, and a semi-transmissive electrode disposed on the second electrode, a first electrode including a reflective metal material, wherein the first electrode is a bottom electrode; an organic light emitting layer disposed on the first electrode, a second electrode disposed on the organic light emitting layer and formed of a transparent metal material, and a semi-transmissive electrode disposed on the second electrode, wherein the first subpixel further includes: a first part of a photo-reactive organic film disposed between the second electrode of the first subpixel and the semi-transmissive electrode, and a first optical auxiliary layer disposed between the first part of the photo-reactive organic film and the semi-transmissive electrode, a first part of a photo-reactive organic film disposed between the second electrode of the first subpixel and the semi-transmissive electrode, and a first optical auxiliary layer disposed between the first part of the photo-reactive organic film and the semi-transmissive electrode, wherein the second subpixel further includes: a second part of the photo-reactive organic film disposed between the second electrode of the second subpixel and the semi-transmissive electrode, and a second optical auxiliary layer disposed between the second part of the photo-reactive organic film and the semi-transmissive electrode, and a second part of the photo-reactive organic film disposed between the second electrode of the second subpixel and the semi-transmissive electrode, and a second optical auxiliary layer disposed between the second part of the photo-reactive organic film and the semi-transmissive electrode, and wherein the third subpixel further includes: a third part of the photo-reactive organic film disposed between the second electrode of the third subpixel and the semi-transmissive electrode, and a third optical auxiliary layer disposed between the third part of the photo-reactive organic film and the semi-transmissive electrode, a third part of the photo-reactive organic film disposed between the second electrode of the third subpixel and the semi-transmissive electrode, and a third optical auxiliary layer disposed between the third part of the photo-reactive organic film and the semi-transmissive electrode, wherein a first distance between the first electrode and the semi-transmissive electrode of the first subpixel, a second distance between the first electrode and the semi-transmissive electrode of the second subpixel, and a third distance between the first electrode and the semi-transmissive electrode of the third subpixel are different from one another, and wherein a thickness of the first optical auxiliary layer, a thickness of the second optical auxiliary layer, and a thickness of the third optical auxiliary layer are different from one another, characterized in that: the photo-reactive organic film includes diarylethene molecules.