Organic EL display device and organic EL display device manufacturing method
In an organic EL display device, a taper angle of a separation layer surrounding edges of an organic EL layer disposed in each pixel and being disposed between adjacent pixels is different from a taper angle of a frame-shaped bank surrounding edges of an organic layer. As a result, qualities required for layers surrounded by the separation layer and the frame-shaped bank respectively are satisfied.
1. A method of manufacturing an organic EL display device with pixels disposed in a matrix form in a display region, the method comprising:
forming a separation layer surrounding edges of an organic EL layer disposed in each pixel and being disposed between adjacent pixels; and
forming a frame-shaped bank covering a periphery of the display region and surrounding edges of a resin layer sealing the organic EL layer,
wherein in the forming a frame-shaped bank, a taper angle of the frame-shaped bank is different from a taper angle of the separation layer,
the forming a separation layer and the forming a frame-shaped bank are performed in a same manufacturing process step,
in the forming a separation layer and the forming a frame-shaped bank, the separation layer and the frame-shaped bank are formed by patterning and forming with use of a mask a film including a photosensitive material,
slit-like openings are provided in a formation region for forming the separation layer and in a formation region for forming the frame-shaped bank in the mask, and
values of D/L are different in the region for forming the separation layer and the region for forming the frame-shaped bank,
where L represents a width of each of the openings in the region for forming the separation layer and in the region for forming the frame-shaped bank, and D represents a width of a light blocking portion between the openings.
2. The method of manufacturing an organic EL display device according to claim 1 ,
wherein in the forming a frame-shaped bank, the taper angle of the frame-shaped bank is larger than the taper angle of the separation layer.
3. The method of manufacturing an organic EL display device according to claim 1 ,
wherein in the forming a frame-shaped bank, the taper angle of the frame-shaped bank is smaller than the taper angle of the separation layer.
4. The method of manufacturing an organic EL display device according to claim 1 ,
wherein a height of the frame-shaped bank is larger than a height of the separation layer.
5. The method of manufacturing an organic EL display device according to claim 1 ,
wherein a height of the separation layer is larger than a height of the frame-shaped bank.
6. The method of manufacturing an organic EL display device according to claim 1 ,
wherein the frame-shaped bank includes a first frame-shaped bank disposed on an inner side, and a second frame-shaped bank surrounding a periphery of the first frame-shaped bank and having a taper angle different from a taper angle of the first frame-shaped bank.
7. The method of manufacturing an organic EL display device according to claim 2 ,
wherein a height of the frame-shaped bank is larger than a height of the separation layer.
8. The method of manufacturing an organic EL display device according to claim 2 ,
wherein a height of the separation layer is larger than a height of the frame-shaped bank.
9. The method of manufacturing an organic EL display device according to claim 2 ,
wherein the frame-shaped bank includes a first frame-shaped bank disposed on an inner side, and a second frame-shaped bank surrounding a periphery of the first frame-shaped bank and having a taper angle different from a taper angle of the first frame-shaped bank.
10. The method of manufacturing an organic EL display device according to claim 3 ,
wherein a height of the frame-shaped bank is larger than a height of the separation layer.
11. The method of manufacturing an organic EL display device according to claim 3 ,
wherein a height of the separation layer is larger than a height of the frame-shaped bank.
12. The method of manufacturing an organic EL display device according to claim 3 ,
wherein the frame-shaped bank includes a first frame-shaped bank disposed on an inner side, and a second frame-shaped bank surrounding a periphery of the first frame-shaped bank
and having a taper angle different from a taper angle of the first frame-shaped bank.