An organic light emitting display device comprising: a substrate (101, 201, 301, 401); a transistor on the substrate (101, 201, 301, 401) and including an active layer (124, 224, 324, 424), a gate electrode (121, 221, 321, 421), a source electrode (123, 223, 323, 423), and a drain electrode (122, 222, 322, 422); a light blocking layer (125, 225, 325, 425) disposed over the substrate (101, 201, 301, 401) and below the active layer (124, 224, 324, 424) of the transistor; an interlayer insulating layer (115c, 215c, 315c, 415c) formed on the substrate (101, 201, 301, 401) including a region on which the gate electrode (121, 221, 321, 421) of the transistor is formed, and including regions provided between the gate electrode (121, 221, 321, 421) and the source electrode (123, 223, 323, 423) and the drain electrode (122, 222, 322, 422); a color filter on the interlayer insulating layer (115c, 215c, 315c, 415c); a first electrode (118, 218, 318, 418) on the color filter, wherein the first electrode (118, 218, 318, 418) at least partially laterally overlaps the color filter and extends toward the transistor so as to be electrically connected to the drain electrode (122, 222, 322, 422), thereby forming an extended portion of the first electrode (118, 218, 318, 418); a barrier layer (115e, 215e, 315e, 415e) surrounding the edges of the first electrode (118, 218, 318, 418) to define a light emitting region; and an organic light emitting layer (130, 230, 330, 430) and a second electrode (128, 228, 328, 428) formed on the first electrode and on the barrier layer (115e, 215e, 315e, 415e), wherein at least a portion of the extended portion of the first electrode (118, 218, 318, 418) is positioned between the drain electrode (122, 222, 322, 422) and the interlayer insulating layer (115c, 215c, 315c, 415c), wherein the drain electrode (122, 222, 322, 422) comprises a first portion electrically connected to the active layer (124, 224, 324, 424) through a first contact hole formed in the interlayer insulating layer (115c, 215c, 315c, 415c) and exposing the active layer (124, 224, 324, 424), and a second portion formed on the first electrode (118, 218, 318, 418) and connected to an upper surface of the first electrode (118, 218, 318, 418), and wherein the second portion is electrically connected to the light blocking layer (125, 225, 325, 425) through a second contact hole formed in the interlayer insulating layer (115c, 215c, 315c, 415c) and exposing the light blocking layer (125, 225, 325, 425). a substrate (101, 201, 301, 401); a transistor on the substrate (101, 201, 301, 401) and including an active layer (124, 224, 324, 424), a gate electrode (121, 221, 321, 421), a source electrode (123, 223, 323, 423), and a drain electrode (122, 222, 322, 422); a light blocking layer (125, 225, 325, 425) disposed over the substrate (101, 201, 301, 401) and below the active layer (124, 224, 324, 424) of the transistor; an interlayer insulating layer (115c, 215c, 315c, 415c) formed on the substrate (101, 201, 301, 401) including a region on which the gate electrode (121, 221, 321, 421) of the transistor is formed, and including regions provided between the gate electrode (121, 221, 321, 421) and the source electrode (123, 223, 323, 423) and the drain electrode (122, 222, 322, 422); a color filter on the interlayer insulating layer (115c, 215c, 315c, 415c); a first electrode (118, 218, 318, 418) on the color filter, wherein the first electrode (118, 218, 318, 418) at least partially laterally overlaps the color filter and extends toward the transistor so as to be electrically connected to the drain electrode (122, 222, 322, 422), thereby forming an extended portion of the first electrode (118, 218, 318, 418); a barrier layer (115e, 215e, 315e, 415e) surrounding the edges of the first electrode (118, 218, 318, 418) to define a light emitting region; and an organic light emitting layer (130, 230, 330, 430) and a second electrode (128, 228, 328, 428) formed on the first electrode and on the barrier layer (115e, 215e, 315e, 415e), wherein at least a portion of the extended portion of the first electrode (118, 218, 318, 418) is positioned between the drain electrode (122, 222, 322, 422) and the interlayer insulating layer (115c, 215c, 315c, 415c), wherein the drain electrode (122, 222, 322, 422) comprises a first portion electrically connected to the active layer (124, 224, 324, 424) through a first contact hole formed in the interlayer insulating layer (115c, 215c, 315c, 415c) and exposing the active layer (124, 224, 324, 424), and a second portion formed on the first electrode (118, 218, 318, 418) and connected to an upper surface of the first electrode (118, 218, 318, 418), and wherein the second portion is electrically connected to the light blocking layer (125, 225, 325, 425) through a second contact hole formed in the interlayer insulating layer (115c, 215c, 315c, 415c) and exposing the light blocking layer (125, 225, 325, 425).