Display device and backlight unit included therein

Abstract

A display device includes a light source to emit light, a light guide plate on which the light emitted from the light source is incident and which irradiates light through a first and a second surface of the light guide plate, a quantum dot sheet on which the light irradiated through the first surface of the light guide plate is incident and which irradiates blue light, green light and red light, a reflective sheet for reflecting the irradiated light to the light guide plate, and a light-converting material at an edge portion of the light guide plate, the quantum dot sheet and the reflective sheet, for converting the light into a yellow light, green light or red light. The light incident on the quantum dot sheet includes the light emitted from the light source and the yellow light, the green light or the red light.

What is claimed is: 
     
       1. A display device, comprising:
 at least one light source configured to emit a blue light; 
 a light guide plate on which the blue light emitted from the at least one light source is incident, and which is configured to irradiate light through a first surface and a second surface of the light guide plate; 
 a quantum dot sheet on which the light irradiated through the first surface of the light guide plate is incident, and which is configured to irradiate the blue light, a green light and a red light; 
 a reflective sheet configured to reflect the light, which is irradiated through the second surface of the light guide plate, to the light guide plate; and 
 a light-converting material provided on a surface of an edge portion of the reflective sheet and configured to convert at least a portion of the blue light incident thereto into light of a different color and irradiate the converted light to the light guide plate. 
 
     
     
       2. The display device according to  claim 1 , wherein the light-converting material is configured to convert the at least the portion of the blue light incident thereto into a yellow light, and
 the blue light emitted from the at least one light source and the yellow light converted by the light-converting material are incident on the quantum dot sheet. 
 
     
     
       3. The display device according to  claim 1 , wherein the light-converting material comprises a fluorescent material, the fluorescent material converting the blue light into a yellow light. 
     
     
       4. The display device according to  claim 1 , wherein the light-converting material is applied to the reflective sheet in an area extending from at least one edge of the reflective sheet. 
     
     
       5. The display device according  claim 4 , wherein the light-converting material is applied in patterns to the reflective sheet, and
 an area of the patterns of the light-converting material decreases as a distance from the at least one edge of the reflective sheet is increased. 
 
     
     
       6. The display device according to  claim 4 , wherein the light-converting material is applied in patterns to the reflective sheet, and
 a density of the patterns of the light-converting material decreases as a distance from the at least one edge of the reflective sheet is increased. 
 
     
     
       7. The display device according to  claim 4 , wherein the light-converting material is applied in a circular pattern to the reflective sheet, and
 the circular pattern comprises a plurality of circles, a size of the plurality of circles decreasing as a distance from the at least one edge of the reflective sheet is increased. 
 
     
     
       8. The display device according to  claim 1 , wherein the light-converting material is applied in a polygonal pattern to the reflective sheet. 
     
     
       9. The display device according to  claim 1 , wherein the light-converting material is applied in a stripe pattern to the reflective sheet. 
     
     
       10. A display device, comprising:
 at least one light source configured to emit a blue light; 
 a light guide plate on which the blue light emitted from the at least one light source is incident, and which is configured to irradiate light through a first surface and a second surface of the light guide plate; 
 a quantum dot sheet on which the light irradiated through the first surface of the light guide plate is incident, and which is configured to irradiate the blue light, a green light, and a red light; and 
 a reflective sheet configured to reflect the light, which is irradiated through the second surface of the light guide plate, to the light guide plate, 
 wherein at least a portion of the blue light incident on a surface of an edge portion of the reflective sheet is converted into light of a color different from a color of the blue light. 
 
     
     
       11. The display device according to  claim 10 , wherein the at least the portion of the blue light incident on the surface of the edge portion of the reflective sheet is converted into a yellow light, and
 the yellow light converted by the edge portion of the reflective sheet and the blue light emitted from the at least one light source are incident on the quantum dot sheet. 
 
     
     
       12. The display device according to  claim 10 , wherein a fluorescent material is applied to the edge portion of the reflective sheet, the fluorescent material converting the light into a yellow light. 
     
     
       13. The display device according to  claim 12 , wherein the fluorescent material is applied to the reflective sheet in an area extending from at least one edge of the reflective sheet. 
     
     
       14. The display device according to  claim 13 , wherein the fluorescent material is applied in patterns to the reflective sheet, and
 an area of the patterns of the fluorescent material decreases as a distance from the at least one edge of the reflective sheet is increased. 
 
     
     
       15. The display device according to  claim 13 , wherein the fluorescent material is applied in patterns to the reflective sheet, and
 a density of the patterns of the fluorescent material decreases as a distance from the at least one edge of the reflective sheet is increased. 
 
     
     
       16. The display device according to  claim 13 , wherein the fluorescent material is applied in a circular pattern to the reflective sheet, and
 the circular pattern comprises a plurality of circles, a size of the plurality of circles decreasing as a distance from the at least one edge of the reflective sheet is increased. 
 
     
     
       17. The display device according to  claim 12 , wherein the fluorescent material is applied in a polygonal pattern to the reflective sheet. 
     
     
       18. The display device according to  claim 12 , wherein the fluorescent material is applied in a stripe pattern to the reflective sheet. 
     
     
       19. A display device, comprising:
 at least one light source configured to emit a blue light; 
 a light guide plate on which the blue light emitted from the at least one light source is incident, and which is configured to irradiate light through a first surface and a second surface of the light guide plate; 
 a quantum dot sheet on which the light irradiated through the first surface of the light guide plate is incident, and which is configured to irradiate the blue light, a green light, and a red light; 
 a reflective sheet configured to reflect the blue light, which is irradiated through the second surface of the light guide plate, to the light guide plate; and 
 an optical sheet disposed on the reflective sheet, 
 wherein at least a portion of the blue light incident on a surface of an edge portion of the optical sheet through the second surface is converted into light of a color different from a color of the blue light and is irradiated to the light guide plate. 
 
     
     
       20. The display device according to  claim 19 , wherein the at least the portion of the blue light incident on the edge portion of the optical sheet is converted into a yellow light, and
 wherein the blue light emitted from the at least one light source and the yellow light converted by the optical sheet are incident on the quantum dot sheet. 
 
     
     
       21. A display device, comprising:
 at least one light source configured to emit blue light;   a light guide plate on which the blue light emitted from the at least one light source is incident, and which is configured to irradiate light through a first surface and a second surface of the light guide plate;   a quantum dot sheet on which the light irradiated through the first surface of the light guide plate is incident, and which is configured to irradiate the blue light, a green light and a red light;   a reflective sheet configured to reflect the light, which is irradiated through the second surface of the light guide plate, to the light guide plate; and   a plurality of light-converting dots provided on a surface of an edge portion of the reflective sheet and configured to convert at least a portion of the blue light incident thereto into light of a different color and irradiate the converted light to the light guide plate,   wherein the plurality of light-converting dots includes first dots, second dots, and third dots, the second dots having a dot size smaller than a dot size of the first dots, respectively, and the third dots having a dot size smaller than a dot size of the second dots, respectively,   the first dots are located closer to an edge of the reflective sheet than the second dots, and   the second dots are located closer to the edge of the reflective sheet than the third dots.    
     
     
       22. A display device, comprising:
 a display panel;   at least one light source configured to emit a blue light;   a light guide plate on which the blue light emitted from the at least one light source is incident;   a quantum dot sheet disposed between the display panel and the light guide plate;   a reflective sheet disposed below the light guide plate; and   a plurality of light-converting dots provided on a surface of an edge portion of the reflective sheet and configured to convert at least a portion of the blue light incident thereto into light of a different color,   wherein the plurality of light-converting dots includes first dots, second dots, and third dots, the second dots having a dot size smaller than a dot size of the first dots, respectively, and the third dots having a dot size smaller than a dot size of the second dots, respectively,   the first dots are located closer to an edge of the reflective sheet than the second dots, and   the second dots are located closer to the edge of the reflective sheet than the third dots.