Highly-efficient backlight for liquid crystal display having no optical films

Okumura, Takamitsu; Tagaya, Akihiro; Koike, Yasuhiro; Horiguchi, Masahiro; Suzuki, Hiromasa

doi:10.1063/1.1613051

Cited by 77 publications

(22 citation statements)

References 4 publications

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“…5. The critical angle for total reflection is expressed as (1) where n i and n fra are the refraction indexes of at the incident light (i) and at the refraction light (fra). When the incident angle of light is smaller than the critical angle of light, refraction occurs.…”

Section: Design Principle and Conception Of The Integrated Lgpmentioning

confidence: 99%

Fabrication of concentric light guiding plate with SiO 2 reflective film

Chien

Chen

2006

SPIE Proceedings

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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.

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Section: Design Principle and Conception Of The Integrated Lgpmentioning

confidence: 99%

Fabrication of concentric light guiding plate with SiO 2 reflective film

Chien

Chen

2006

SPIE Proceedings

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“…In order to improve the uniformity of the BLU, some optical sheets including the diffusion sheet, the prism sheet and the reflection sheet are combined into the conventional LGP to make the light emit in a direction perpendicular toward the BLU top and to enhance luminous uniformity. For the market of small size panel increasing, it is desirable to make the BLU to be thinner, brighter and lighter in many researches (Akihiro and Yasuhior 2000;Serge and Denis 2000;Takamitsu et al 2003). There are also many patents, which have been proposed for small size LCD backlight panel (Kenmochi 1992;Ciupke et al 1996).…”

Section: Introductionmentioning

confidence: 97%

The study of integrated LED-backlight plate fabricated by micromachining technique

Chien

Chen

2008

Microsyst Technol

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Generally, a backlight unit (BLU) is considered for the light module of a thin film transistor (TFT) LCD. A typical BLU is comprised of a light guide plate (LGP) and some optical sheets, such as two diffusion sheets, two prism sheets and a reflection sheet. To make the traditional BLU thinner and brighter, we develop an integrated LEDbacklight plate (BLP) on microstructures-based, which combine several functions of optical sheets to save the space and fabrication process. The microstructures and the reflective thin film are constructed on the BLP by using micromachining and hot-embossing techniques in the research. From the results of luminous measurements, the luminous uniformity of 86.1% of our fabricated BLP has achieved a demand of a general panel. In future, the micromachining BLP could make the LED-backlight thinner, brighter and lighter for mobile phone applications.

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“…Till now, there have been many types of the LGP to be proposed. [1][2][3][4][5][6]. The LGP has many microstructures on its top, bottom surface, or the both to frustrate TIR to let light emerge from the LGP inside.…”

Section: Introductionmentioning

confidence: 99%

Optical characteristic of the light guide plate with microstructures engraved by laser

Teng

Kuo²

2012

SPIE Proceedings

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In this paper, we investigated the optical characteristic of the light guide plate (LGP) with microstructures engraved by a CO 2 laser. The LGP is for edge-lit backlighting of liquid crystal display. Traditionally, the microstructures on largescaled LGP are formed by screen-printing, which are hardly formed by inject molding. However, the screen-printed LGP highly scatters light and has lower optical efficiency. Therefore, a method was proposed to use the laser to directly engrave the flat surface of a bare LGP with microstructures. The engraved LGP has better optical performance due to the polished surface of the engraved-microstructures, and can be used for large-scaled application such LCD TV backlighting. We used different processing parameters to engrave the microstructures of 11 different shapes on a bare LGP and measured the cross-sectional dimensions of the microstructure. Among them, five kinds of shapes were chosen to be engraved on the bare LGPs respectively as samples. The five LGP samples were measured for spatial and angular luminance by the BM7 and Conoscope. With difference in the profiles of the microstructures, the angular distributions of light emitting from the LGP also differ. All the experimental data of the samples were compared with one another and the on-axis luminance of the best LGP sample could potentially increase 50% more than the reference sample if a proper optical film was chosen to accompany it.

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Highly-efficient backlight for liquid crystal display having no optical films

Cited by 77 publications

References 4 publications

Fabrication of concentric light guiding plate with SiO 2 reflective film

Fabrication of concentric light guiding plate with SiO 2 reflective film

The study of integrated LED-backlight plate fabricated by micromachining technique

Optical characteristic of the light guide plate with microstructures engraved by laser

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