A bottom-emission organic light emitting display device, comprising: - a display panel including sub-pixels (RSP, GSP, BSP) emitting light of at least three colors (R, G, B); and - a driver supplying a driving signal to the display panel , wherein each of the sub-pixels (RSP, GSP, BSP) emitting light of one of the at least three colors (R, G, B) includes an opening region (EA) having a first color filter (CF) and a first portion of a light-emitting element for emitting its own color, wherein each of the sub-pixels (RSP, GSP, BSP) further includes a light-emitting participation region (EA&NEA) in which a second portion of the light emitting element , at least a first transistor unit (TFTA) and at least one second color filter (DCF) are formed, wherein the at least one second color filter (DCF) is formed separately from the first color filter (CF) included in the opening region (EA), so that light of the same color as the respective own color is additionally emitted, wherein at least one of the sub-pixels (RSP, GSP, BSP) emitting the light of the color includes the lower electrode extending from the opening region (EA) to the light-emitting participation region (EA&NEA), wherein the first portion of the light emitting element comprises a first portion of the lower electrode , an organic light-emitting layer and an upper electrode , and the second portion of the light emitting element comprises a second portion of the lower electrode , the organic light-emitting layer and the upper electrode ; and wherein the light-emitting participation region (EA&NEA) of each of the sub-pixels comprises the at least one second color filter to convert emitted light with the same color as the color converted by the first color filter, included in the opening region (EA) of the respective sub-pixel (RSP, GSP, BSP) and formed under the first portion of the lower electrode . - a display panel including sub-pixels (RSP, GSP, BSP) emitting light of at least three colors (R, G, B); and - a driver supplying a driving signal to the display panel , wherein each of the sub-pixels (RSP, GSP, BSP) emitting light of one of the at least three colors (R, G, B) includes an opening region (EA) having a first color filter (CF) and a first portion of a light-emitting element for emitting its own color, wherein each of the sub-pixels (RSP, GSP, BSP) further includes a light-emitting participation region (EA&NEA) in which a second portion of the light emitting element , at least a first transistor unit (TFTA) and at least one second color filter (DCF) are formed, wherein the at least one second color filter (DCF) is formed separately from the first color filter (CF) included in the opening region (EA), so that light of the same color as the respective own color is additionally emitted, wherein at least one of the sub-pixels (RSP, GSP, BSP) emitting the light of the color includes the lower electrode extending from the opening region (EA) to the light-emitting participation region (EA&NEA), wherein the first portion of the light emitting element comprises a first portion of the lower electrode , an organic light-emitting layer and an upper electrode , and the second portion of the light emitting element comprises a second portion of the lower electrode , the organic light-emitting layer and the upper electrode ; and wherein the light-emitting participation region (EA&NEA) of each of the sub-pixels comprises the at least one second color filter to convert emitted light with the same color as the color converted by the first color filter, included in the opening region (EA) of the respective sub-pixel (RSP, GSP, BSP) and formed under the first portion of the lower electrode . <EOS>