Recently, the display device was developed to apply to the transparency display device(TDD), but the TDD was no brightness. The purpose of this paper was introduced a double layer optical film to improve luminance of the TDD. The film was doped micro metal oxide particles to increase the effect of scattering and refraction, and the micro structure was fabricated between the top and bottom film to enhance the light into the TDD. This research provided a transparent double layer optical film. The transparency of the film was achieved to 70 %, and the brightness efficiency up to 60 %.
OLEDs(Organic Light Emitting Diodes) has been applied to lighting and display fields. OLEDs has many advantages such as no viewing angle and fast reaction rate and so on. However, OLEDs still has low brightening issue in lighting field. This research fabricates a simple and fast production line, to produce light extraction film of the OLED. Microparticles in light extraction film were provided to enhance light luminance efficiency of the OLED up to 90%. A simple and fast production line was designed and fabricated by mechanical processing mode. It can produce 20 pieces light extraction films within 1hour.
An optical thin film was provided to address light illuminance efficiency of OLED up to 80%. A polymer material was used as a film base material which could avoid the influence of total reflection angle. One kinds of oxidized metal micro-particles was chosen to dope inside the optical thin film and to increase scattering and refractive effect.
In recent years, OLED has advantages including that larger light area, thinner thickness, excellent light uniformity, and can be as a flexible light source. Many display panel and lighting have been started to use the OLED due to OLED without back light system, thus how to make and employ light extracting layer could be important issue to enhance OLED brightness. The purpose of this study is to enhance the light extraction efficiency and light emitting area of OLED, so the micro lens array and the prism reflection layer were provided to enhance the surface light extracting efficiency of OLD. Finally the prism layer and diffusing layer were used to increase the uniformity of emitting area of OLED, which the efficiency of 31% increasing to compare with the OLED without light extracting film.
An edge-backlight unit (EBLU) is applied as the light device to provide uniform light of liquid crystal display (LCD).
Generally, the cathode cold fluorescent lamp (CCFL) is employed as the light source of BLU. 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. 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. In this paper, the integrated LED reflector is proposed because it
enables the point-like light to distribute propagating-light line pattern successfully. 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. Therefore, the integrated LED reflector not only can decrease the number of
LED to save the built space, but also enhance the output efficiency. In the future, an integrated LED reflector could
make displays thinner and brighter for backlight applications.
A conventional backlight unit (BLU) is used to as the light module to present uniform light of liquid crystal display
(LCD). In general, cold cathode fluorescent lamp (CCFL) is utilized to be the light source of BLU. The light emitting
diode (LED) is now considered well known as a promising device for solid state lighting. It has the advantages of long
durability, no mercury substance and good endurance of heavy impact. 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. In this research, the LED uniform lightguide is demonstrated because it enables the point-like
light to distribute propagating-light line pattern successfully. By optimizing the size and the radian of the device, the
designed LED uniform lightguide can achieve the output efficiency more than 85%, and its illuminative uniformity is
improved about 85%. Thus, the LED uniform lightguide not only can decrease the number of LED to save the space, but
also enhance the optical efficiency. In the future, a novel LED uniform module could make displays thinner and lighter
for backlight system applications.
A conventional backlight unit (BLU) is utilized to as the light module to present uniform light of liquid crystal display
(LCD). In general, cold cathode fluorescent lamp (CCFL) is used to be the light source of BLU. The light emitting diode
(LED) is well known as a promising device for solid state lighting. It has the advantages of long life, no mercury
containing and good endurance of heavy impact. 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. 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. 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. Thus, the LED light-linear device with microprsims not only can decrease
the LED to save the space, but also increase the optical efficiency. In future, a novel LED light module could make
displays thinner and lighter for light guide plate (LGP) applications.
An edge-backlight unit (EBLU) is applied to as the light device to provide uniform light of liquid crystal display (LCD).
Generally, cathode cold fluorescent lamp (CCFL) is utilized to be the light source of BLU. With the advantages like long
life, no mercury containing and good endurance of heavy impact, the light emitting diode (LED) is well known as a
viable device for solid state lighting. To achieve the market requirement of the thin-film liquid crystal display (LCD) and
the green-level product, the LED is replaced the CCFL used in monitor to make display thinner, lighter, no Hg
containing. In this paper, the integrated LED luminance-uniform device with right angle microprism structure is
proposed that it can make the point-like light to distribute propagating-light line pattern successfully. To optimize the
distributions and sizes of microprisms, our designed LED-linear device can achieve an optical efficiency more than 85%,
and its light output area is 2.5 times the input light source. Therefore, the LED luminous device with microprsims not
only can decrease the LED to save the space, but also enhance the luminous efficiency. In future, an integrated LED
luminance-uniform device could make displays thinner and brighter for light guide plate (LGP) applications.
Backlight unit (BLU) comprises light sources, light guiding plate (LGP), prism sheets, two diffusive sheets and
reflective sheet. Following the development of the thin-film liquid crystal display (LCD), many researchers have devoted
to improve the BLU and then make it lighter, thinner and brighter. The LGP is a very important component in backlight
unit (BLU). In General, Injection molding technology is utilized to fabricate the LGP, which is made of polymethyl
methacrylate (PMMA). In this research, the integrated LGP with the microstructures of double-sides and a thin-film of
enhanced reflection is fabricated by using Microelectromechanical Systems and hot-embossing techniques. A new BLU
will be simplified to use only one guiding light component without using any optical sheets. The integrated LGP can
eliminate three types of the optical components including reflective sheet, diffusive sheet, prism sheet in BLU; therefore,
the space and the fabrication cost are saved. In future, the integrated LGP could make the display thinner and brighter for
TFT-LCD application.
A backlight unit (BLU) of TFT-LCD is composed of a light source, a light guiding plate (LGP), prism sheets, diffusive sheets and a reflective sheet. The LGP is a very important component in backlight panel (BLP). Generally, Polymethyl methacrylate (PMMA) material is chosen to make the LGP by using injection molding technique. In this research, Microelectromechanical Systems (MEMS) and hot-embossing technology are applied to fabricate the integrated LGP with the microstructures of double-sides and a reflective film. The new BLU will be only one integrated LGP without any other optical components, which are a reflective sheet, a diffusive sheet, and a prism sheet in BLU, and it can save the space and the fabrication cost. In future, the integrated LGP could make the display thinner and brighter for LCD application.
A 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. A typical BLP is comprised of a light-guiding plate (LGP) and some optical components, such as reflective sheets, diffusive sheets, and prism sheets. We propose an integrated LGP that combines three functions of optical components by using microelectromechanical systems (MEMS) and hot-embossing techniques. 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. From experimental illumination results, the maximum illumination is 426.1 lux and the minimum illumination is 370.4 lux. Thus, the integrated LGP achieves a uniformity of illumination of 86.9%. The new BLU could be simplified as only one integrated LGP and only one white LED light source without using any optical components. We anticipate that the integrated LGP could make the displays thinner and brighter for thin LCD application.
A traditional LCD backlight system is consist of light sources, a light guiding plate and prism sheets, diffusive sheets and reflective sheet. Following the development of the thin LCD, modify the backlight system which has already become the trend. The light guiding plate is very important element in backlight unit which is usually made of Polymethyl methacrylate (PMMA). Generally, the light guiding plates is fabricated by injection molding. MEMS and hot embossing technologies are applied to fabricate the integrated light guiding plate in this research. The micro-prisms, the micro pyramids and Al thin film are based on the integrated light guiding plate which is guiding light to the LCD panel evenly. So the backlight system will be simplified to use only one integrated light guiding plate without using any optical sheets. The light guiding plate can reduce three optical sheets in backlight, so it can save the space and lower the process cost. Non-prism LGPs and integrated LGPs are presented in this paper.
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