Light emitting display apparatus

1 . A light emitting display apparatus comprising:

a substrate comprising a light emitting surface and a plurality of pixels having an emission area, the plurality of pixels including a first pixel, a second pixel, and a third pixel, the second pixel disposed between and immediately adjacent to the first pixel and the third pixel, each of the first pixel, the second pixel, and the third pixel including a plurality of subpixels;

a pixel circuit layer comprising a plurality of insulating layers over the substrate;

a protection layer over the pixel circuit layer;

a light extraction portion formed at an upper surface of the protection layer in the emission area, the light extraction portion comprising a plurality of concave portions and a plurality of convex portions each formed between the plurality of concave portions;

a light emitting device layer on the light extraction portion, the light emitting device layer configured to emit light to the light emitting surface; and

a light guide surface at the protection layer disposed at each of the plurality of pixels, the light guide surface including:

a first step transitioning from a first height to a second height from a bottom surface of the protection layer and overlapping, in a plan view of the light emitting display apparatus, a first bank between the first pixel and the second pixel, the second height being non-zero and shorter than the first height, and

a second step transitioning from a third height to a fourth height from the bottom surface of the protection layer and overlapping, in the plan view of the light emitting display apparatus, a second bank between the second pixel and the third pixel, the fourth height being non-zero and shorter than the third height;

wherein the light guide surface is inclined with respect to the light emitting surface from the second height of the first step to the third height of the second step across the plurality of subpixels of the second pixel.

2 . The light emitting display apparatus of claim 1 , wherein the light guide surface commonly overlaps with respective emission areas of the plurality of subpixels within one pixel.

3 . The light emitting display apparatus of claim 2 , wherein the light guide surface comprises:

a first end portion at a first side of each of the plurality of pixels; and

a second end portion at second side of each of the plurality of pixels that is opposite the first side; and

the first end portion and the second end portion of the light guide surface are parallel to a second direction intersecting a first direction.

4 . The light emitting display apparatus of claim 3 , wherein a distance between the light emitting surface of the substrate and the light guide surface gradually increases as the light guide surface extends from the first end portion to the second end portion, or gradually increases as the light guide surface extends from the second end portion to the first end portion.

5 . The light emitting display apparatus of claim 1 , wherein the light guide surface is at the protection layer and the plurality of concave portions are concave away from the substrate.

6 . The light emitting display apparatus of claim 5 , wherein an inclination angle of the light guide surface with respect to the light emitting surface of the substrate satisfies a following Expression:

W ×tan(β)≤ T

where, W is a pixel width parallel to a first direction, β is the inclination angle of the light guide surface, and T is a thickness of the protection layer.

7 . The light emitting display apparatus of claim 1 , wherein an inclination of the light guide surface with respect to the light emitting surface is from 0.03° to 0.72°.

8 . The light emitting display apparatus of claim 1 , further comprising:

a third bank between the plurality of subpixels of one of the first pixel, second pixel, or third pixel; and

data lines and a reference line disposed under the third bank.

9 . A light emitting display apparatus comprising:

a substrate comprising a light emitting surface and a plurality of pixels, the plurality of pixels including a first pixel, a second pixel, and a third pixel, the second pixel disposed between and immediately adjacent to the first pixel and the third pixel, each of the first pixel, the second pixel, and the third pixel including a plurality of subpixels;

a light extraction portion over the substrate, the light extraction portion comprising a plurality of concave portions and a plurality of convex portions each formed between the plurality of concave portions;

a light emitting device layer over the light extraction portion, the light emitting device layer comprising light emitting layer and a light reflection surface; and

a light guide surface at a layer between the light emitting surface and the light reflection surface, the light guide surface including:

a first step transitioning from a first height to a second height from a bottom surface of the layer and overlapping, in a plan view of the light emitting display apparatus, a first bank between the first pixel and the second pixel, the second height being non-zero and shorter than the first height, and

a second step transitioning from a third height to a fourth height from the bottom surface of the layer and overlapping, in the plan view of the light emitting display apparatus, a second bank between the second pixel and the third pixel, the fourth height being non-zero and shorter than the third height,

wherein the light guide surface is inclined with respect to the light emitting surface from the second height of the first step to the third height of the second step across the plurality of subpixels of the second pixel.

10 . The light emitting display apparatus of claim 9 , wherein the light guide surface is at a path along which light emitted from the light emitting device layer is extracted to the light emitting surface.

11 . The light emitting display apparatus of claim 10 , further comprising:

a pixel circuit layer over the substrate, the pixel circuit layer comprising a plurality of insulating layers; and

a protection layer between the pixel circuit layer and the light emitting device layer, the protection layer having the light extraction portion, and

wherein the layer is the protection layer.

12 . The light emitting display apparatus of claim 11 , wherein the light guide surface is at the protection layer and the plurality of concave portions are concave away from the substrate.

13 . The light emitting display apparatus of claim 10 , wherein the light guide surface commonly overlaps with respective emission areas of the plurality of subpixels within one pixel or individually overlaps with respective emission areas of the plurality of subpixels within one pixel.

14 . The light emitting display apparatus of claim 10 , further comprising:

a color filter layer at a path along which light emitted from the light emitting device layer is extracted to the light emitting surface.

15 . The light emitting display apparatus of claim 9 , wherein the light emitting device layer further comprises:

a first electrode between the light extraction portion and the light emitting layer; and

a second electrode over the light emitting layer, the second electrode having the light reflection surface.

16 . The light emitting display apparatus of claim 9 , wherein the light guide surface is a blazed grating.

17 . The light emitting display apparatus of claim 9 , further comprising:

a polarization member coupled to the light emitting surface of the substrate.

18 . The light emitting display apparatus of claim 9 , wherein an inclination of the light guide surface with respect to the light emitting surface is from 0.03° to 0.72°.

19 . The light emitting display apparatus of claim 9 , further comprising:

a third bank between the plurality of subpixels of one of the first pixel, second pixel, or third pixel; and

data lines and a reference line disposed under the third bank.