US2013088857A1PendingUtilityA1

Optical assembly, backlight unit having the same, and display apparatus thereof

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Assignee: LEE KYUNGJOONPriority: Oct 11, 2011Filed: Jul 25, 2012Published: Apr 11, 2013
Est. expiryOct 11, 2031(~5.2 yrs left)· nominal 20-yr term from priority
Inventors:Kyungjoon LeeWoongjoon HwangJuyong Joung
H10H 20/855G02B 19/0061G02B 6/0068G02B 6/0031G02B 2207/113F21V 5/04G02F 1/133603G02B 19/0028G02B 6/0073G02B 6/0021G09F 13/14G02B 19/0047
52
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Claims

Abstract

The present invention provides an optical assembly, a backlight unit having the same, and a display apparatus thereof, and the optical assembly includes: a light emitting device; and a lens disposed above the light emitting device, and the lens has: a lower surface portion through which light emitted from the light emitting device travels inside; an upper surface portion that totally reflects at least some of the light traveling inside through the lower surface portion, downward to the side; and a side portion through which the light totally reflected from the upper surface portion is discharged to the outside.

Claims

exact text as granted — not AI-modified
1 . A backlight unit comprising a plurality of light sources,
 wherein the light source includes:   a light emitting device; and   a lens disposed above the light emitting device, and the lens has:   a lower surface portion through which light emitted from the light emitting device travels inside;   an upper surface portion that totally reflects at least some of the light traveling inside through the lower surface portion, downward to the side; and   a side portion through which the light totally reflected from the upper surface portion is discharged to the outside.   
     
     
         2 . The backlight unit of  claim 1 , wherein the lower surface portion of the lens has a shape recessed upward to cover the light emitting device. 
     
     
         3 . The backlight unit of  claim 2 , wherein at least a portion of the lower surface portion of the lens has any one cross-sectional shape of a straight line, a triangle, a circle, and an ellipse. 
     
     
         4 . The backlight unit of  claim 1 , wherein the upper surface portion of the lens has a shape recessed downward at the center portion. 
     
     
         5 . The backlight unit of  claim 4 , wherein the depth of the upper surface portion is 0.3 or more times the distance from the center potion to the end of the upper surface portion. 
     
     
         6 . The backlight unit of  claim 1 , wherein at least a portion of the upper surface portion of the lens has any one cross-sectional shape of a parabola, a circle, and an ellipse. 
     
     
         7 . The backlight unit of  claim 6 , wherein the surface curvature of a parabola corresponding to the cross-sectional shape of the upper surface portion is ¼ to 4. 
     
     
         8 . The backlight unit of  claim 1 , wherein the upper surface portion of the lens includes a plurality of light emission patterns having a shape that is convex upward. 
     
     
         9 . The backlight unit of  claim 1 , wherein the side portion of the lens is inclined at a predetermined angle toward the inside the lens. 
     
     
         10 . The backlight unit of  claim 1 , wherein the side portion of the lens is inclined at a predetermined angle outward from the lens. 
     
     
         11 . The backlight unit of  claim 9 , wherein the inclination angle of the side portion of the lens is 0 degree to 45 degrees. 
     
     
         12 . The backlight unit of  claim 1 , wherein at least a portion of the side portion of the lens has any one cross-sectional shape of a straight line, a circle, and an ellipse. 
     
     
         13 . The backlight unit of  claim 1 , wherein the side portion of the lens includes a plurality of protrusion patterns that is convex outward. 
     
     
         14 . The backlight unit of  claim 1 , wherein the lens includes a plurality of particles for diffusing light. 
     
     
         15 . The backlight unit of  claim 1 , wherein the light source further includes a diffusion layer disposed at a lower side of the lens. 
     
     
         16 . The backlight unit of  claim 1 , wherein the light source further includes a second lens disposed above the lens and adjusting light discharged through the upper surface portion of the lens. 
     
     
         17 . The backlight unit of  claim 1 , wherein the light source further includes a light shielding layer disposed above the lens and the light shielding layer includes a plurality of patterns for transmitting or blocking light emitted through the upper surface portion of the lens. 
     
     
         18 . The backlight unit of  claim 1 , further comprising a reflective sheet disposed under the light source and having a plurality of embossed or intagliated patterns. 
     
     
         19 . A display apparatus comprising:
 a backlight unit including a plurality of light sources; and   a display panel disposed on the backlight unit,   wherein at least one of the plurality of light sources of the backlight unit includes:   a light emitting device; and   a lens disposed above the light emitting device, and the lens has:   a lower surface portion through which light emitted from the light emitting device travels inside;   an upper surface portion that totally reflects at least some of the light traveling inside through the lower surface portion, downward to the side; and   a side portion through which the light totally reflected from the upper surface portion is discharged to the outside.   
     
     
         20 . The display apparatus of  claim 19 , wherein the lower surface portion of the lens has a shape recessed upward to cover the light emitting device. 
     
     
         21 . The display apparatus of  claim 19 , wherein the upper surface portion of the lens has a shape recessed downward at the center portion. 
     
     
         22 . The display apparatus of  claim 19 , wherein the side portion of the lens is inclined at a predetermined angle toward the inside the lens. 
     
     
         23 . The display apparatus of  claim 19 , wherein the lens includes a plurality of particles for diffusing light. 
     
     
         24 . The display apparatus of  claim 19 , wherein the light source further includes a diffusion layer disposed on the underside of the lens. 
     
     
         25 . The display apparatus of  claim 19 , wherein the light source further includes a second lens disposed above the lens and adjusting light discharged through the upper surface portion of the lens. 
     
     
         26 . The display apparatus of  claim 19 , further comprising an optical sheet disposed between the backlight unit and the display panel,
 wherein the lens further includes at least one protrusion supporting the optical sheet.   
     
     
         27 . An optical assembly comprising:
 a light emitting device; and   a lens disposed above the light emitting device, and the lens has:   a lower surface portion through which light emitted from the light emitting device travels inside;   an upper surface portion that totally reflects at least some of the light traveling inside through the lower surface portion, downward to the side; and   a side portion through which the light totally reflected from the upper surface portion is discharged to the outside.   
     
     
         28 . The optical assembly of  claim 27 , wherein the lower surface portion of the lens has a shape recessed upward to cover the light emitting device. 
     
     
         29 . The optical assembly of  claim 27 , wherein the upper surface portion of the lens has a shape recessed downward at the center portion. 
     
     
         30 . The optical assembly of  claim 27 , wherein the side portion of the lens is inclined at a predetermined angle toward the inside the lens.

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