Display apparatus having a backlight unit

Abstract

A display apparatus includes a display panel, a panel guide supporting a lower edge of the display panel, and a backlight unit supplying light to the display panel. The backlight unit includes at least one first substrate, a plurality of light emitting elements, and a plurality of light guide structures disposed on the at least first one substrate and arranged relative to one or more of the plurality of light emitting elements.

We claim: 
     
         1 . A display apparatus comprising:
 a display panel;   a backlight unit supplying light to the display panel and comprising:
 at least one first substrate; 
 a plurality of light emitting elements arranged in a first pattern on the at least one first substrate; and 
 a light guide structure disposed on the at least one substrate and arranged in a second pattern relative to one or more of the plurality of light emitting elements; 
 wherein one or more of the plurality of light emitting elements comprise:
 a first conductivity type semiconductor layer, an active layer, and a second conductivity type semiconductor layer; 
 an ohmic layer disposed on the second conductivity type semiconductor layer to form ohmic contact therewith; and 
 a first pad metal layer electrically connected to the first conductivity type semiconductor layer; 
 a second pad metal layer electrically connected to the ohmic layer; 
 an upper insulation layer covering the first and second pad metal layers, the upper insulation layer having a plurality of openings exposing upper surfaces of the first and second pad metal layers, respectively; and 
 a first bump pad and a second bump pad connected to upper surfaces of the first pad metal layer and the second pad metal layer exposed through the plurality of openings of the upper insulation layer, respectively; 
 wherein the light guide structure further comprises a first light guide structure and a second light guide structure, and 
 a first distance from a top surface of the first light guide structure to a top surface of the one or more light emitting elements is different from a second distance from a top surface of the second light guide structure to the top surface of the one or more light emitting elements. 
 
   
     
     
         2 . The display apparatus of  claim 1 ,
 wherein the upper insulation layer further comprises a distributed Bragg reflector in which SiO 2  and TiO 2  are repeatedly stacked on each other.   
     
     
         3 . The display apparatus of  claim 1 , further comprising:
 a lower insulation layer arranged between the second conductivity type semiconductor layer and the upper insulation layer, and   wherein the upper insulation layer further comprises a first opening region and the lower insulation layer has a second opening region, and the first opening region does not overlap with the second open region.   
     
     
         4 . The display apparatus of  claim 1 ,
 wherein a portion of the lower insulation layer contacting the ohmic layer has a different thickness with a portion of the lower insulation layer disposed around the ohmic layer.   
     
     
         5 . The display apparatus of  claim 3 , wherein:
 the one or more light emitting elements further comprise a second substrate; and   an edge of the lower insulation layer is farther to an edge of the second substrate that an edge of the upper insulation layer is.   
     
     
         6 . The display apparatus of  claim 1 ,
 wherein the second bump pad further comprises an inclined surface.   
     
     
         7 . The display apparatus of  claim 1 ,
 wherein the light guide structure further comprises a protrusion region.   
     
     
         8 . A display apparatus comprising:
 a display panel;   a backlight unit supplying light to the display panel and comprising:
 at least one first substrate; 
 a plurality of light emitting elements arranged in a first pattern on the at least one first substrate; 
 a light guide structure disposed on the at least one first substrate and arranged in a second pattern relative to one or more of the plurality of light emitting elements; 
 wherein one or more of the plurality of light emitting elements comprise:
 a first conductivity type semiconductor layer, an active layer, and a second conductivity type semiconductor layer; 
 an ohmic layer disposed on the second conductivity type semiconductor layer to form ohmic contact therewith; and 
 a first pad metal layer electrically connected to the first conductivity type semiconductor layer; 
 a second pad metal layer electrically connected to the ohmic layer; 
 an upper insulation layer covering the first and second pad metal layers, the upper insulation layer having a plurality of openings exposing upper surfaces of the first and second pad metal layers, respectively; and 
 a first bump pad and a second bump pad connected to upper surfaces of the first pad metal layer and the second pad metal layer exposed through the plurality of openings of the upper insulation layer, respectively, 
 wherein the light guide structure further comprises a first light guide structure and a second light guide structure, and the first light guide structure comprises a protrusion region. 
 
   
     
     
         9 . The display apparatus of  claim 8 , wherein the first light guide structure further comprises a lens disposed on the one or more light emitting elements and configured to adjust uniformity of light. 
     
     
         10 . The display apparatus of  claim 8 , wherein the first light guide structure is configured to cover the one or more light emitting elements and configured to adjust uniformity of light. 
     
     
         11 . The display apparatus of  claim 8 , wherein the second light guide structure further comprises a plurality of reflective sheets and a light emitting element is disposed between a pair of reflective sheets. 
     
     
         12 . A display apparatus comprising:
 a display panel;   a backlight unit supplying light to the display panel and comprising:
 at least one first substrate; 
 a plurality of light emitting elements arranged in a first pattern on the at least one first substrate and comprising a first light emitting element disposed at a first terminal of the first pattern and a last light emitting element disposed at a last terminal of the first pattern; 
 a light guide structure disposed on the at least first one substrate and arranged in a second pattern relative to one or more of the plurality of light emitting elements; 
 wherein one or more of the plurality of light emitting elements comprise:
 a first conductivity type semiconductor layer, an active layer, and a second conductivity type semiconductor layer; 
 an ohmic layer disposed on the second conductivity type semiconductor layer to form ohmic contact therewith; and 
 a first pad metal layer electrically connected to the first conductivity type semiconductor layer; 
 a second pad metal layer electrically connected to the ohmic layer; 
 an upper insulation layer covering the first and second pad metal layers, the upper insulation layer having a plurality of openings exposing upper surfaces of the first and second pad metal layers, respectively; and 
 a first bump pad and a second bump pad connected to the upper surfaces of the first pad metal layer and the second pad metal layer exposed through the plurality of openings of the upper insulation layer, respectively. 
 
   
     
     
         13 . The display apparatus of  claim 12 ,
 wherein the plurality of light emitting elements are regularly arranged in the first pattern; and   further comprising one or more connectors electrically connecting adjacent light emitting elements to each other to form a series array of light emitting elements.   
     
     
         14 . The display apparatus of  claim 13 , wherein:
 the light guide structure further comprise a first light guide structure and a second light guide structure, and   a first distance from a top surface of the first light guide structure to a top surface of one or more of the plurality of light emitting elements is different from a second distance from a top surface of the second light guide structure to the top surface of the one or more of the plurality of light emitting elements.   
     
     
         15 . The display apparatus of  claim 13 ,
 wherein the upper insulation layer further comprises a distributed Bragg reflector in which SiO 2  and TiO 2  are repeatedly stacked on each other.   
     
     
         16 . The display apparatus of  claim 12 , further comprising a lower insulation layer arranged between the second conductivity type semiconductor layer and the upper insulation layer, and
 wherein the upper insulation layer further comprises a first opening region and the lower insulation layer has a second opening region, and the first opening region does not overlap with the second open region.   
     
     
         17 . The display apparatus of  claim 16 ,
 wherein a portion of the lower insulation layer contacting the ohmic layer has a different thickness from a portion of the lower insulation layer disposed around the ohmic layer.   
     
     
         18 . The display apparatus of  claim 12 , wherein:
 one or more of the plurality of light emitting elements further comprise a second substrate; and   an edge of the lower insulation layer is farther to an edge of the second substrate that an edge of the upper insulation layer is.   
     
     
         19 . The display apparatus of  claim 12 ,
 wherein the second bump pad further comprises an inclined surface.   
     
     
         20 . The display apparatus of  claim 12 ,
 wherein the light guide structure further comprise a protrusion region.