| US 7,513,632 B2 | ||
| Direct-illumination backlight apparatus having transparent plate acting as light guide plate | ||
| Hyung Suk Kim, Kyungki-Do (Korea, Republic of); Jung Kyu Park, Seoul (Korea, Republic of); Ho Sik Ahn, Kyungki-Do (Korea, Republic of); Young June Jeong, Kyungki-Do (Korea, Republic of); Young Sam Park, Seoul (Korea, Republic of); Hun Joo Hahm, Kyungki-Do (Korea, Republic of); and Bum Jin Kim, Kyungki-Do (Korea, Republic of) | ||
| Assigned to Samsung Electro-Mechanics Co., Ltd., Suwon-Kyungki-Do (Korea, Republic of) | ||
| Filed on Sep. 24, 2007, as Appl. No. 11/860,391. | ||
| Application 11/860391 is a continuation of application No. 11/136529, filed on May 25, 2005, granted, now 7,273,291. | ||
| Claims priority of application No. 10-2005-13659 (KR), filed on Feb. 18, 2005. | ||
| Prior Publication US 2008/0013315 A1, Jan. 17, 2008 | ||
| Int. Cl. G01D 11/28 (2006.01) | ||
| U.S. Cl. 362—30 [362/330; 362/27; 362/29] | 20 Claims |
| 1. A direct-illumination backlight apparatus, comprising:
a flat reflective plate;
an LED light source arranged on the reflective plate;
a transparent plate arranged above the LED light source;
a scattering pattern arranged on an underside of the transparent plate in a position corresponding to the LED light source,
the scattering pattern spaced apart from the LED light source; and
a light guide made of transparent material, and arranged around the scattering pattern to introduce light incident from below
into the transparent plate so that the light is internally reflected by the transparent plate.
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