L E D REFLECTOR FREE
This part must be free from the light extraction structures (white paint dots or microprisms). Previously proposed solution (1) was to perform the mixing in a part of the main light guide. If a string of high-brightness red, green and blue LEDs is used as a light source in an edge-lit backlight system, additional arrangements are required to allow the light of different colors to mix before it can be used as the light source for LCD. Furthermore, conceptually the system is very close to the existing CCFL backlights and allows re-use of the existing components and infrastructure. The components of the system have been optimized enabling high optical efficiency while maintaining low cost and good manufacturability. The system uses high-power red, green and blue LEDs and has a minimum thickness despite the arrangement for color mixing. We have developed a novel optical system for an edge-lit LED backlight. (C) 2006 Society of Photo-Optical Instrumentation Engineers. We anticipate that the integrated LGP could make the displays thinner and brighter for thin LCD application. The new BLU could be simplified as only one integrated LGP and only one white LED light source without using any optical components. Thus, the integrated LGP achieves a uniformity of illumination of 86.9%. From experimental illumination results, the maximum illumination is 426.1 lux and the minimum illumination is 370.4 lux. The microprism structure, the micropyramid structure, and an aluminum thin film are used for the integrated LGP not only to eliminate the five optical components, but also to save the space and the cost of the BLU. We propose an integrated LGP that combines three functions of optical components by using microelectromechanical systems (MEMS) and hot-embossing techniques. A typical BLP is comprised of a light-guiding plate (LGP) and some optical components, such as reflective sheets, diffusive sheets, and prism sheets. In future, a novel LED light module could make displays thinner and lighter for light guide plate (LGP) applications.Ī backlight panel (BLP) with a cold cathode fluorescent lamp (CCFL) light source, which is referred to as the backlight unit (BLU) is considered in the light module of a thin film transistor (TFT) LCD. Thus, the LED light-linear device with microprsims not only can decrease the LED to save the space, but also increase the optical efficiency. By optimizing the distributions and sizes of microprisms, the designed LED-linear device can achieve an illuminative efficiency more than 80%~90%, and its light output area is two times the input light source. In this research, the LED light-linear device with microprism structure is demonstrated that it can make the point-like light to distribute propagating-light line pattern successfully.
To satisfy the market demands of the thin-film liquid crystal display (LCD) and the green product, the LED is applied to as the light source to make display thinner, lighter, no Hg containing. It has the advantages of long life, no mercury containing and good endurance of heavy impact. The light emitting diode (LED) is well known as a promising device for solid state lighting. In general, cold cathode fluorescent lamp (CCFL) is used to be the light source of BLU. In the future, an integrated LED reflector could make displays thinner and brighter for backlight applications.Ī conventional backlight unit (BLU) is utilized to as the light module to present uniform light of liquid crystal display (LCD). Therefore, the integrated LED reflector not only can decrease the number of LED to save the built space, but also enhance the output efficiency. To optimize the size and the radian of the reflector, our designed integrated LED reflector can achieve an optical efficiency more than 85%, and its light output length is 11 times of the input light source. In this paper, the integrated LED reflector is proposed because it enables the point-like light to distribute propagating-light line pattern successfully.
To achieve the market requirement of the thin-film liquid crystal display (LCD) and the green-level product, the LED is replaced with the CCFL used in monitor in order to make display thinner, lighter, no Hg containing. With the advantages such as long durability, no mercury substance and good endurance of heavy impact, the light emitting diode (LED) is now accepted well known as available device for solid state lighting. Generally, the cathode cold fluorescent lamp (CCFL) is employed as the light source of BLU.
An edge-backlight unit (EBLU) is applied as the light device to provide uniform light of liquid crystal display (LCD).
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