Organic light-emitting display device and manufacturing method thereof

A light-emitting display device comprising:

• a substrate including a red light-emitting area, a green light-emitting area, and a blue light-emitting area;
• a driving element comprising a first thin film transistor (TFT) formed in the red light-emitting area, a second TFT formed in the green light-emitting area, and a third TFT formed in the blue light-emitting area;
• a planarization layer covering the first, second, and third TFTs and including via holes exposing at least a part of each of drain electrodes of the first, second, and third TFTs;
• a light-emitting element comprising:
• pattern electrodes electrically connected to the drain electrodes through the via holes,
• a red organic light-emitting layer disposed on a pattern electrode corresponding to the first TFT,
• a green organic light-emitting layer disposed on a pattern electrode corresponding to the second TFT,
• a blue organic light-emitting layer disposed on a pattern electrode corresponding to the third TFT, and
• a common electrode covering the red organic light-emitting layer, the green organic light-emitting layer, and the blue organic light-emitting layer;
• and
• a pixel defining layer covering at least a part of each of the pattern electrodes electrically connected to the drain electrodes and at least a part of the planarization layer exposed by the pattern electrodes,
• wherein a surface level difference of the planarization layer corresponding to the green organic light-emitting layer is greater than a surface level difference of the planarization layer corresponding to the red organic light-emitting layer and smaller than a surface level difference of the planarization layer corresponding to the blue organic light-emitting layer.

A method of manufacturing a light-emitting display device, the method comprising:

• forming a first thin film transistor (TFT), a second TFT, and a third TFT in a red light-emitting area, a green light-emitting area, and a blue light-emitting area, respectively, on a substrate;
• forming a planarization layer covering the first, second, and third TFTs and including via holes exposing at least a part of each of drain electrodes of the first, second, and third TFTs;
• forming pattern electrodes electrically connected to the drain electrodes through the via holes;
• forming a pixel defining layer covering at least a part of each of the pattern electrodes and at least a part of the planarization layer exposed by the pattern electrodes;
• forming a red organic light-emitting layer, a green organic light-emitting layer, and a blue organic light-emitting layer on a pattern electrode corresponding to the first TFT, a pattern electrode corresponding to the second TFT, and a pattern electrode corresponding to the third TFT, respectively;
• and
• forming a common electrode covering the pixel defining layer and the organic light-emitting layer,
• wherein a surface level difference of the planarization layer corresponding to the green organic light-emitting layer is greater than a surface level difference of the planarization layer corresponding to the red organic light-emitting layer and smaller than a surface level difference of the planarization layer corresponding to the blue organic light-emitting layer.

A method of manufacturing a light-emitting display device, the method comprising:

• forming a first thin film transistor (TFT), a second TFT, and a third TFT in a first light-emitting area, a second light-emitting area, and a third light-emitting area, respectively, on a substrate, respectively;
• forming a first planarization layer covering the first, second, and third TFTs and including first via holes exposing at least a part of each of drain electrodes of the first to third TFTs;
• forming contact metals electrically connected to the drain electrodes through the first via holes;
• forming a second planarization layer covering at least a part of each of the contact metals and at least a part of the first planarization layer and including second via holes exposing at least a part of each of the contact metals;
• forming pattern electrodes electrically connected to the contact metals through the second via holes;
• forming a pixel defining layer on the second planarization layer to expose the pattern electrodes through openings formed to define a plurality of pixels;
• and
• forming a red organic light-emitting layer, a green organic light-emitting layer, and a blue organic light-emitting layer on a pattern electrode corresponding to the first TFT, a pattern electrode corresponding to the second TFT, and a pattern electrode corresponding to the third TFT, respectively,
• wherein a surface level difference of the planarization layer corresponding to the green organic light-emitting layer is greater than a surface level difference of the planarization layer corresponding to the red organic light-emitting layer and smaller than a surface level difference of the planarization layer corresponding to the blue organic light-emitting layer.