An organic light emitting display device comprising at least a first sub-pixel configured to emit white or blue light and a second sub-pixel configured to emit red or green light, each sub-pixel comprising: an emission unit including an organic light emitting diode (OLED); and a pixel circuit unit including: a driving transistor, at least one switching transistor (ST1, ST2), a capacitor (Cst), a light blocking unit including a light blocking layer, and an opening in the light blocking layer, wherein the pixel circuit unit is configured to drive the emission unit, and the light blocking layer and opening are configured to selectively block the light input to the pixel circuit unit; wherein the area of the opening in the light blocking layer of the first sub-pixel is different from the area of the opening in the light blocking layer of the second sub-pixel, and the light blocking unit in each sub-pixel is an area other than the emission unit and the opening in the respective sub-pixel; wherein the opening in the light blocking layer of the first sub-pixel is an area in which at least one of the switching transistors (ST1; ST2) of the first sub-pixel is provided and at least a portion of an area in which the driving transistor of the first sub-pixel is provided, and the opening in the light blocking layer of the second sub-pixel is an area in which at least one of the switching transistors (ST1; ST2) of the second sub-pixel is provided, and the light blocking layer is provided in an area including the driving transistor of the second sub-pixel. an emission unit including an organic light emitting diode (OLED); and a pixel circuit unit including: a driving transistor, at least one switching transistor (ST1, ST2), a capacitor (Cst), a light blocking unit including a light blocking layer, and an opening in the light blocking layer, wherein the pixel circuit unit is configured to drive the emission unit, and the light blocking layer and opening are configured to selectively block the light input to the pixel circuit unit; wherein the area of the opening in the light blocking layer of the first sub-pixel is different from the area of the opening in the light blocking layer of the second sub-pixel, and the light blocking unit in each sub-pixel is an area other than the emission unit and the opening in the respective sub-pixel; wherein the opening in the light blocking layer of the first sub-pixel is an area in which at least one of the switching transistors (ST1; ST2) of the first sub-pixel is provided and at least a portion of an area in which the driving transistor of the first sub-pixel is provided, and the opening in the light blocking layer of the second sub-pixel is an area in which at least one of the switching transistors (ST1; ST2) of the second sub-pixel is provided, and the light blocking layer is provided in an area including the driving transistor of the second sub-pixel. a driving transistor, at least one switching transistor (ST1, ST2), a capacitor (Cst), a light blocking unit including a light blocking layer, and an opening in the light blocking layer, wherein the pixel circuit unit is configured to drive the emission unit, and the light blocking layer and opening are configured to selectively block the light input to the pixel circuit unit; wherein the area of the opening in the light blocking layer of the first sub-pixel is different from the area of the opening in the light blocking layer of the second sub-pixel, and the light blocking unit in each sub-pixel is an area other than the emission unit and the opening in the respective sub-pixel; wherein the opening in the light blocking layer of the first sub-pixel is an area in which at least one of the switching transistors (ST1; ST2) of the first sub-pixel is provided and at least a portion of an area in which the driving transistor of the first sub-pixel is provided, and the opening in the light blocking layer of the second sub-pixel is an area in which at least one of the switching transistors (ST1; ST2) of the second sub-pixel is provided, and the light blocking layer is provided in an area including the driving transistor of the second sub-pixel.