Light emitting display device
A light emitting display device includes an inclined reflective portion that is below a bank and disposed in each of a plurality of pixel regions. The device includes a light emitting diode disposed in an opening. Each of the plurality of pixel regions is configured such that the corresponding opening and reflective portion have a cardioid-shaped structure with a cusp. A display region includes a first region of a first PPI and a second region of a second PPI smaller than the first PPI. The pixel region disposed in the first region has a first type cardioid-shaped structure, and the pixel region disposed in the second region has a second type cardioid-shaped structure. The first type cardioid-shaped structure has a smaller rate of change in curvature than the second type cardioid-shaped structure.
1 . A light emitting display device, comprising:
a bank that is on a substrate and includes an opening corresponding to each of a plurality of pixel regions of a display region;
an inclined reflective portion that is below the bank and disposed in each of the plurality of pixel regions; and
a light emitting diode disposed in the opening,
wherein each of the plurality of pixel regions is configured such that the corresponding opening and reflective portion have a cardioid-shaped structure that includes a cusp,
wherein the display region includes a first region of a first pixels per inch (PPI) and a second region of a second PPI smaller than the first PPI,
wherein the pixel region disposed in the first region has a first type cardioid-shaped structure, and the pixel region disposed in the second region has a second type cardioid-shaped structure, and
wherein the first type cardioid-shaped structure has a smaller rate of change in curvature than the second type cardioid-shaped structure.
2 . The light emitting display device of claim 1 , wherein the reflective portion of the pixel region disposed in the first region has a linear inclination form, and
wherein the reflective portion of the pixel region disposed in the second region has a curved inclination form of being convex toward an inside of the pixel region.
3 . The light emitting display device of claim 2 , wherein the reflective portion of the first region has a first inclination angle, and
wherein the reflective portion of the second region has a second inclination angle at its bottom that is larger than the first inclination angle, and decreases in inclination angle toward its top.
4 . The light emitting display device of claim 1 , wherein the pixel regions of the first region include a pixel region whose cardioid-shaped structure is located in a first orientation, and a pixel region whose cardioid-shaped structure is located in a second orientation opposite to the first orientation.
5 . The light emitting display device of claim 1 , wherein the pixel regions of the second region include a pixel region whose cardioid-shaped structure is located in a first orientation, and a pixel region whose cardioid-shaped structure is located in a second orientation opposite to the first orientation.
6 . The light emitting display device of claim 4 , wherein in the first region, the pixel regions of the first and second orientations are arranged alternately along one direction.
7 . The light emitting display device of claim 5 , wherein in the second region, the pixel regions of the first and second orientations are arranged alternately along one direction.
8 . The light emitting display device of claim 1 , wherein the cardioid-shaped structure is defined as r=r0*(1+ε*cos(θ/2)), where θ is an azimuth angle, r0 is a radius at the cusp, r is a radius at θ, and ε is a deformation parameter.
9 . The light emitting display device of claim 1 , wherein the light emitting diode includes a first electrode, an emission layer on the first electrode, and a second electrode on the emission layer, and
wherein the reflective portion extends from the first electrode.