Display device and manufacturing method of the same

1. A display device comprising:

a display region arranged above a substrate;

a first light emitting element emitting light of a first color, a second light emitting element emitting light of a second color, and a third light emitting element emitting light of a third color arranged in the display region; and

a first optical path length adjustment film, a second optical path length adjustment film, and a third optical path length adjustment film in the display region,

wherein

the first optical path length adjustment film has a first region overlapping the first light emitting element, the second light emitting element and the third light emitting element;

the second optical path length adjustment film has a second region not overlapping the third light emitting element, and overlapping the first light emitting element and the second light emitting element; and

the third optical path length adjustment film has a third region not overlapping the second light emitting element, and overlapping the first light emitting element and the third light emitting element.

2. The display device according to claim 1 , wherein a film thickness of the second optical path length adjustment film is thicker than a film thickness of the first optical path length adjustment film and a film thickness of the third optical path length adjustment film, respectively.

3. The display device according to claim 1 , wherein a first refractive index of the first optical path length adjustment film, a second refractive index of the second optical path length adjustment films and a third refractive index of the third optical path length adjustment films are the same.

4. The display device according to claim 1 , further comprising:

a fourth optical path length adjustment film above the first to third optical path length adjustment films, and a forth refractive index of the fourth optical path length adjustment film is lower than the first refractive index, the second refractive index, and the third refractive index, respectively.

5. A display device comprising:

a display region arranged above a substrate;

a first light emitting element emitting light of a first color, a second light emitting element emitting light of a second color, a third light emitting element emitting light of the second color and a fourth light emitting element emitting light of a third color arranged in the display region; and

a first optical path length adjustment film, a second optical path length adjustment film, and a third optical path length adjustment film in the display region,

wherein

the first optical path length adjustment film has a first region overlapping the first light emitting element, the second light emitting element, the third light emitting element and the fourth light emitting element;

the second optical path length adjustment film has a second region not overlapping the third light emitting element and the fourth light emitting element, and overlapping the first light emitting element and the second light emitting element; and

the third optical path length adjustment film has a third region not overlapping the second light emitting element and the fourth light emitting element, and overlapping the first light emitting element and the third light emitting element.

6. The display device according to claim 5 , wherein a film thickness of the first optical path length adjustment film is thicker than a film thickness of the second optical path length adjustment film and a film thickness of the third optical path length adjustment film, respectively.

7. The display device according to claim 5 , wherein a first refractive index of the first optical path length adjustment film, a second refractive index of the second optical path length adjustment films and a third refractive index of the third optical path length adjustment films are the same.

8. The display device according to claim 5 , further comprising:

a fourth optical path length adjustment film above the first to third optical path length adjustment films, and a forth refractive index of the fourth optical path length adjustment film is lower than the first refractive index, the second refractive index and the third refractive index, respectively.