Backlight unit

Abstract

A backlight unit includes: a light guide plate of an entirely flat structure; a light emitting element disposed on at least one side of the light guide plate; a first reflection part disposed under the light guide plate and having one side thereof extended to a region where the light emitting element is positioned; a second reflection part disposed on the light emitting element; and a housing for accommodating the light guide plate, the light emitting element, and the first and second reflection parts, wherein the housing has a second side which is vertically extended upwards with respect to a first side which defines a lateral cross section of the housing in which the light emitting element is accommodated as the lower side, and a third side which is vertically extended inwards with respect to the second side.

1 . A backlight unit comprising:
 a light guide plate having an overall flat structure;   a light emitting device disposed on at least one side of the light guide plate;   a first reflector disposed under the light guide plate and having one side extending to an area in which the light emitting device is disposed;   a second reflector disposed on the light emitting device; and a housing receiving the light guide plate, the light emitting device, and the first and second reflectors,   wherein the housing has a side portion on which the light emitting device is received, the side portion having a cross-section including a first side defined as a lower surface of the housing, a second side vertically extending from the first side in an upper direction of the housing and a third side vertically extending from the second side in an inner direction of the housing, and   wherein the light emitting device comprises a flip-chip type light emitting diode chip and a wavelength conversion layer covering an upper surface and both side surfaces of the light emitting diode chip.   
     
     
         2 . The backlight unit of  claim 1 , further comprising: a circuit board disposed on the second side within the housing. 
     
     
         3 . The backlight unit of  claim 2 , wherein the circuit board has one surface facing the second side within the housing, and the other surface on which the light emitting device is mounted. 
     
     
         4 . The backlight unit of  claim 3 , wherein the first reflector has an upper surface facing a lower surface of the light guide plate and one side surface of the light emitting device, and a distal end facing a portion of the other surface of the circuit board. 
     
     
         5 . The backlight unit of  claim 2 , wherein the second reflector has a portion extending to a position between the second side and the circuit board. 
     
     
         6 . The backlight unit of  claim 2 , wherein the second reflector has a portion of an upper surface contacting a portion of a lower surface of the third side, a portion of a lower surface contacting a portion of the circuit board, and another portion of the lower surface contacting a portion of an upper surface of the light guide plate. 
     
     
         7 . The backlight unit of  claim 1 , wherein the wavelength conversion layer comprises a first layer covering the upper surface of the light emitting diode chip and a second layer covering both side surfaces of the light emitting diode chip, the first layer having a higher thickness than the second layer. 
     
     
         8 . The backlight unit of  claim 2 , further comprising: optical sheets disposed on the light guide plate; and a light shielding tape disposed parallel to the third side to cover edges of the optical sheets in order to secure the optical sheets while preventing light leakage. 
     
     
         9 . A backlight unit comprising:
 a light guide plate having an overall flat structure;   a light emitting device disposed on at least one side of the light guide plate; and   a housing receiving the light guide plate and the light emitting device, and having a side portion, on which the light emitting device is received, having a cross section comprising a second side vertically extending in an upper direction based on a first side defined as a lower side, and a third side vertically extending in an inner direction based on the second side,   wherein the light emitting device comprises a flip-chip type light emitting diode chip and a wavelength conversion layer covering an upper surface and both side surfaces of the light emitting diode chip,   wherein the wavelength conversion layer comprises a first layer covering the upper surface of the light emitting diode chip and a second layer covering both side surfaces of the light emitting diode chip, the first layer having a higher thickness than the second layer.   
     
     
         10 . The backlight unit of  claim 9 , further comprising:
 a circuit board disposed on the second side within the housing.   
     
     
         11 . The backlight unit of  claim 9 , further comprising:
 a first reflector disposed under the light guide plate and having one side extending to an area in which the light emitting device is disposed.   
     
     
         12 . The backlight unit of  claim 11 , further comprising: a circuit board disposed on the second side within the housing, wherein the first reflector has an upper surface facing a lower surface of the light guide plate and one side surface of the light emitting device, and a distal end facing a portion of the other surface of the circuit board. 
     
     
         13 . The backlight unit of  claim 12 , further comprising:
 a second reflector disposed on a portion of an upper surface of the light guide plate,   wherein the second reflector has a portion extending to a position between the second side and the circuit board.   
     
     
         14 . The backlight unit of  claim 13 , wherein the second reflector has a portion of an upper surface contacting a lower surface of the third side, a portion of a lower surface contacting a portion of the circuit board, and another portion of the lower surface contacting a portion of an upper surface of the light guide plate. 
     
     
         15 . The backlight unit of  claim 9 , further comprising: optical sheets disposed on the light guide plate; and a light shielding tape disposed parallel to the third side to cover edges of the optical sheets in order to secure the optical sheets while preventing light leakage.