Source: http://www.docstoc.com/docs/57740503/Optical-Sheet-And-Backlight-Assembly-Of-Liquid-Crystal-Display-With-The-Same---Patent-7645057
Timestamp: 2014-07-30 03:50:26
Document Index: 92605963

Matched Legal Cases: ['Application No. 10', 'arts 511', 'arts 511', 'arts 511', 'arts 511', 'arts 511', 'arts 511', 'arts 511', 'art 511']

Optical Sheet And Backlight Assembly Of Liquid Crystal Display With The Same - Patent 7645057
United States Patent: 7645057
12/016,756
11318922Dec., 20057344282
2005-0033262
362/330,331,333,335,607,611,613,614,619,625 359/362,364-366,664,710,727
2003/0086030
02-214287
5-089827
8-240720
08-248403
9-101401
10-010304
11-142609
2002-120230
2004-006256
2004-126376
2004-145328
2004-145329
2004-191611
2004-200072
2004-309557
2005-55485
10-2001-0055519
10-2005-0083468
2006-38128
11/318,922, filed Dec. 27, 2005, now U.S. Pat. No. 7,344,282 which claims
the benefit of Korean Application No. 10-2005-0033262, filed on Apr. 21,
1.  An optical sheet comprising: a substrate;  and a plurality of convex parts protruded from the substrate by a predetermined thickness, a thickness of each of the plurality
of convex parts increasing from an edge to a center thereof, wherein each of the plurality of convex parts is formed in a circular shape, wherein at least two convex parts are formed in different sizes on the substrate, and an average length of the
convex parts is provided in a range of 45.about.70 .mu.m, and the plurality of convex parts are ununiformly arranged in plurality on the substrate.
5.  An optical sheet comprising: a substrate;  and a plurality of convex parts protruded from the substrate, wherein each of the plurality of convex parts is formed in a substantially hemispherical, and at least two convex parts are formed in
different sizes on the substrate, and an average length of the convex parts is in a range of 45.about.70 .mu.m, and the plurality of convex parts are ununiformly arranged in plurality on the substrate.
6.  A backlight assembly of a liquid crystal display, comprising: a lamp for emitting light;  and an optical sheet comprising a substrate, and a plurality of convex parts protruded from the substrate, wherein each of the plurality of convex
parts is a circular shape, and at least two convex parts are formed in different sizes on the substrate, and an average length of the convex parts is provided in a range of 45.about.70 .mu.m, and the plurality of convex parts are ununiformly arranged in
plurality on the substrate.
7.  A backlight assembly of a liquid crystal display, comprising: a lamp for emitting light;  and an optical sheet comprising a substrate, and a plurality of convex parts protruded from the substrate, wherein at least one convex part is formed
in a hemisphere shape, and at least two convex parts are formed in different sizes on the substrate, and an average length of the convex parts is in a range 45.about.70 .mu.m, and the plurality of convex parts are ununiformly arranged in plurality on the
The light guide unit includes the reflection plate 54, the light guide plate 52, and a plurality of optical sheets 53.  The light guide plate 52 is disposed on one side of the lamp unit 51 and guides the light emitted from the lamp unit 51.
The reflection plate 54 is disposed under the light guide plate 52.  Light leaking out from the light guide plate 52 is again reflected toward the light guide plate 52 by the reflection plate 54.
Since the sheets can be interchangeable with the diffusion sheet, the prism sheet, and the protection sheet, although the title of the invention is the optical sheet, the term &quot;prism sheet &quot; is used in some portions for explaining the invention
The substrate 510 and the convex parts 511 can be formed in one body.  Even when the convex parts 511 are ununiformly arranged, the light can be efficiently diffused and condensed.  Meanwhile, a total thickness (h) of the optical sheet 500 may
The number of the convex parts 511 can be given as Eq.  (1) below Number of convex parts (n)=150.sup.2/r.sup.2&amp;gt;18 (1) where n: number of convex parts per 300 .mu.m.times.300 .mu.m r=d/2 (d: average length of convex parts) 45 .mu.m&amp;lt;d&amp;lt;70
Using Eq.  (1), when the average length of the convex parts is 45 .mu.m, maximum 44 convex parts per 300 .mu.m.times.300 .mu.m can be arranged.
Meanwhile, Table 1 below shows the luminance gain in the case where 27 convex parts 511 per 300 .mu.m.times.300 82 m are formed and the case where 34 convex parts 511 per 300 .mu.m.times.300 .mu.m are formed.
In Table 1, the sheet 1 is an optical sheet where 27 convex parts 511 per 300 .mu.m.times.300 .mu.m are formed, and the sheet 2 is an optical sheet where 34 convex parts 511 per 300 .mu.m.times.300 .mu.m are formed.  The luminance gain is
convex parts per 300 .mu.m.times.300 .mu.m are formed.
Also, the thickness (h2) of the protruded convex part 511 can be changed in a range of 1/3-2/3 times of the average length (d) of the convex parts.  In this manner, the luminance gain of the optical sheet 500 can be improved.
Optical sheet and backlight assembly of liquid crystal display with the same, et al., Cheul Yong Kim, Sang Mook Kim, Jong Wook Huh, Dong Ryoul Kim, Ki Won Jeon, Ju Won Lee, Eun Jung Ham, Myung Su Lee, Application number 12 016-756, Illumination, Optical: Systems And Elements, liquid crystal display, light source, light guide, patent search, liquid crystal panel, Patent Attorney, English Español, Patent Inventor, Last name, display device
The present invention relates to a backlight assembly of a liquid crystal display device, and more particularly, to an optical sheet and a backlight assembly of a liquid crystal display with the same.DESCRIPTION OF THE RELATED ARTRecently, to replace heavy and bulky cathode ray tube (CRTs), various kinds of flat panel displays have been developed. Examples of the flat panel displays are a liquid crystal display (LCD), a field emission display (FED), a plasma displaypanel (PDP), an electro-luminescence display (ELD), and so on. Many attempts have been made to provide an enhanced display quality and large screen of the flat panel displays.The LCD has advantages of a small size, lightweight, and low power consumption. Therefore, the use of the LCD tends to gradually increase.The LCD is a non-luminous display device that displays an image using a light source such as a lamp. The LCD displays an image using electrical and optical properties of liquid crystals injected inside a liquid crystal panel.Unlike the CRT, the liquid crystals injected between a thin film transistor (TFT) substrate and a color filter substrate are not a light emitting material that emits light by itself, but a light receiving material that emits light by controllingan amount of an external light. Therefore, the LCD requires a backlight unit that irradiates light onto the liquid crystal panel.The backlight unit includes a mold frame with a receiving space, a reflection sheet disposed in a base of the receiving space to reflect the light toward the liquid crystal panel, a light guide plate disposed on the reflection sheet to guide thelight, a lamp unit disposed between the light guide plate and a sidewall of the receiving space to emit the light, optical sheets stacked on the light guide plate to diffuse and condense the light, and a top chassis disposed on the mold frame to coverfrom an edge portion of the liquid crystal panel to a side of the mold frame.The optical sheets include a diffusion s
LCD backlight containing a LED with adapted light emission and BACKlight Power Chain
LED BACKLIGHT BOARD ASSEMBLY 751-144-01 REV B