Source: http://www.google.com/patents/US7738189?dq=7800613
Timestamp: 2017-08-19 17:15:06
Document Index: 381202758

Matched Legal Cases: ['art.\n2', 'art.\n6', 'art,\n9', 'art,\n10', 'art.\n13', 'art,\n15', 'art 460', 'art 460', 'art 460', 'art 480', 'art 460', 'art 460']

Patent US7738189 - Side emitting lens, and backlight unit and liquid crystal display including ... - Google Patents
The present invention provides a side emitting lens that may reduce optical loss and improve light emitting ratios, and a backlight unit and liquid crystal display including the side emitting lens. The side emitting lens may have a substantially dome-shaped body. The body includes a base part on which...http://www.google.com/patents/US7738189?utm_source=gb-gplus-sharePatent US7738189 - Side emitting lens, and backlight unit and liquid crystal display including the same
Publication number US7738189 B2
Application number US 11/928,717
Also published as US20080297918
Publication number 11928717, 928717, US 7738189 B2, US 7738189B2, US-B2-7738189, US7738189 B2, US7738189B2
Inventors Se Ki PARK, Gi Cherl KIM, Seock Hwan Kang, Eun Jeong KANG
Side emitting lens, and backlight unit and liquid crystal display including the same
US 7738189 B2
a reflecting part in the shape of a conical recess at a central portion of the refracting part to fully reflect the incident light toward at least one of the refracting part and the base part, the reflecting part comprising two or more reflecting surfaces,
wherein at least two of the two or more reflecting surfaces are curved surfaces,
wherein the reflecting part comprises a first reflecting surface and a second reflecting surface,
wherein each of the first reflecting surface, second reflecting surface, and second refracting surface is a curved surface,
wherein each of the first refracting surface and third refracting surface is a flat surface, and
wherein each of the first refracting surface and third refracting surface is inclined with respect to the base part.
2. The side emitting lens of claim 1, a radius of curvature of the first reflecting surface is in the range of 1.3 to 1.5 times of the height of the side emitting lens, a radius of curvature of the second reflecting surface is in the range of 0.4 to 0.6 times of the height of the side emitting lens, and a radius of curvature of the second refracting surface is in the range of 0.2 to 0.4 times of the height of the side emitting lens.
3. The side emitting lens of claim 2, wherein a center of the radius of curvature of the first reflecting surface is located outside the side emitting lens and above the base part, and
4. The side emitting lens of claim 2, a diameter of the base part is in the range of 2.8 to 3 times of the height of the side emitting lens, and a diameter of the recess is in the range of 1.9 to 2.1 times of the height of the side emitting lens.
5. A side emitting lens, comprising:
a reflecting part in the shape of a conical recess at a central portion of the refracting part to fully reflect the incident light toward at least one of the refracting part and the base part, the reflecting part comprising two or more reflecting surfaces, wherein at least two of the two or more reflecting surfaces are curved surfaces,
wherein the reflecting part comprises a first reflecting surface, a second reflecting surface, and a third reflecting surface,
wherein each of the third reflecting surface, first refracting surface, and third refracting surface is a flat surface, and
wherein each of the third reflecting surface, first refracting surface, and third refracting surface is inclined with respect to the base part.
6. The side emitting lens of claim 5, a radius of curvature of the first reflecting surface is in the range of 2.9 to 3.1 times of the height of the side emitting lens, a radius of curvature of the second reflecting surface is in the range of 0.3 to 0.5 times of the height of the side emitting lens, and a radius of curvature of the second refracting surface is in the range of 0.2 to 0.4 times of the height of the side emitting lens.
7. The side emitting lens of claim 5, a radius of curvature of the first reflecting surface is in the range of 1.3 to 1.5 times of the height of the side emitting lens, a radius of curvature of the second reflecting surface is in the range of 0.5 to 0.7 times of the height of the side emitting lens, and a radius of curvature of the second refracting surface is in the range of 0.2 to 0.4 times of the height of the side emitting lens.
8. The side emitting lens of claim 6, wherein a center of the radius of curvature of the first reflecting surface is located below the base part,
9. The side emitting lens of claim 7, wherein a center of the radius of curvature of the first reflecting surface is located below the base part,
10. The side emitting lens of claim 6, a diameter of the base part is in the range of 2.8 to 3 times of the height of the side emitting lens, and a diameter of the recess is in the range of 1.9 to 2.1 times of the height of the side emitting lens.
11. The side emitting lens of claim 7, a diameter of the base part is in the range of 2.8 to 3 times of the height of the side emitting lens, and a diameter of the recess is in the range of 1.9 to 2.1 times of the height of the side emitting lens.
12. A side emitting lens, comprising:
wherein the refracting part comprises a first refracting surface adjacent to the third reflecting surface and a second refracting surface adjacent to the base part,
wherein each of the first reflecting surface, second reflecting surface, third reflecting surface, and first refracting surface is a curved surface,
wherein the second refracting surface is a flat surface, and
wherein the second refracting surface is substantially perpendicular to the base part.
13. The side emitting lens of claim 12, a radius of curvature of the first reflecting surface is in the range of 2.6 to 2.8 times of the height of the side emitting lens, a radius of curvature of the second reflecting surface is in the range of 2.1 to 2.3 times of the height of the side emitting lens, a radius of curvature of the third reflecting surface is in the range of 0.8 to 1 times of the height of the side emitting lens, and a radius of curvature of the first refracting surface is in the range of 0.5 to 0.7 times of the height of the side emitting lens.
14. The side emitting lens of claim 13, wherein centers of the radii of curvature of the first reflecting surface and second reflecting surface are located below the base part,
15. The side emitting lens of claim 13, a diameter of the base part is in the range of 3.6 to 3.8 times of the height of the side emitting lens, and a diameter of the recess is in the range of 2.7 to 2.9 times of the height of the side emitting lens.
16. The side emitting lens of claim 1, wherein the side emitting lens comprises a transparent resin having a refractive index of more than 1.
wherein the side emitting lens has a body,
wherein at least two of the two or more reflecting surfaces are curved surfaces, and the refracting part comprises at least one refracting surface that is a curved surface,
a light guide plate disposed on each side emitting lens; and
19. The backlight unit of claim 17, the distance between the light emitting chip and the base part is in the range of 0.1 to 0.3 times of the height of the side emitting lens.
The invention is described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure is thorough, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of the layers and regions may be exaggerated for clarity. Like reference numerals in the drawings denote like elements.
The base part 460 has a circular shape. However, the shape of the base part 460 is not limited to a circular shape and may be modified in various ways to correspond to the shape of a light emitting diode. In this embodiment, the diameter W1 of the base part 460 is 9.40.
The reflecting part 480 includes a fourth reflecting surface S4-1, a fifth reflecting surface S5-1, and a sixth reflecting surface S6-1. The fourth reflecting surface S4-1 is adjacent to a vertex of the recess, and the sixth reflecting surface S6-1 is adjacent to an inlet of the recess. The fifth reflecting surface S5-1 is disposed between the fourth reflecting surface S4-1 and the sixth reflecting surface S6-1.
In this case, each of the seventh reflecting surface S7, the eighth reflecting surface S8, and the ninth reflecting surface S9 is a curved surface having a predetermined curvature. In this exemplary embodiment, the radius of curvature of the seventh reflecting surface S7 is 8.75, the radius of curvature of the eighth reflecting surface S8 is 7, and the radius of curvature of the ninth reflecting surface S9 is 2.98. Further, the centers C7 and C8 of the radii of curvature of the seventh reflecting surface S7 and the eighth reflecting surface S8, respectively, are located outside the side emitting lens 450 and below the base part 460, and the center C9 of the radius of curvature of the ninth reflecting surface S9 is located outside the side emitting lens 450 and above the base part 460.
FIG. 15B shows the simulation results of illuminance distribution detected by the photodetector disposed above a light guide plate of conventional light source units, and FIG. 16B shows the simulation results of illuminance distribution detected by a photodetector disposed above a light guide plate of light source units according to the present invention. FIG. 15C shows the simulation results of illuminance distribution of light that passes through the upper surface of the light guide plate disposed above a conventional light source unit, and FIG. 16C shows the simulation results of illuminance distribution of light that passes through the upper surface of a light guide plate disposed above a light source unit according to the present invention. FIG. 15D shows the simulation results of illuminance distribution of light that is incident on the lower surface of a light guide plate disposed above a conventional light source unit, and FIG. 16D shows the simulation results of illuminance distribution of light that is incident on the lower surface of a light guide plate disposed above a light source unit according to the present invention. FIG. 15E shows the simulation results of illuminance distribution of light that is incident on a reflecting sheet disposed below a conventional light source unit, and FIG. 15E shows the simulation results of illuminance distribution of light that is incident on a reflecting sheet disposed below a light source unit according to the present invention. Further, FIG. 15F shows the simulation results of uniformity in illuminance of light that passes through the upper surface of a light guide plate disposed above a conventional light source unit, and FIG. 16F shows the simulation results of uniformity in illuminance of light that passes through the upper surface of a light guide plate disposed above a light source unit according to the present invention.
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US8142056 * Jul 16, 2010 Mar 27, 2012 Chia-Mao Li High efficiency refraction body
US9010951 May 12, 2014 Apr 21, 2015 Lg Innotek Co., Ltd. Optical lens, light emitting device, and display
U.S. Classification 359/727, 345/102
International Classification H01L33/58, G02B17/00
Cooperative Classification H01L2224/49107, H01L2224/48091, G02B19/0061, G02B19/0028, G02B19/0071, G02F2001/133607, H01L33/58, G02F1/133611, G02F1/133603, G02B3/08
European Classification G02F1/1336B1, G02B17/08N1P, G02B3/08