scholarly journals A Light Guide Plate That Uses Asymmetric Intensity Distribution of Mini-LEDs for the Planar Illuminator

Crystals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 141 ◽  
Author(s):  
Zhi-Ting Ye ◽  
Yung-Min Pai ◽  
Cheng-Huan Chen ◽  
Hao-Chung Kuo ◽  
Lung-Chien Chen
Keyword(s):  
Intensity Distribution ◽  
Light Guide ◽  
Light Emitting Diode ◽  
Bottom Surface ◽  
Total Efficiency ◽  
Considerable Time ◽  
Light Emitting ◽  
Light Guide Plate ◽  
Guide Plate ◽  
Diffusion Reflection

Traditional backlights are designed with new dot patterns, and then injection molding, laser beam fabrication, or UV (Ultraviolet) roll-to-plate imprinting is used to apply dot patterns to a light guide plate—the process consumes considerable time and resources. Therefore, we propose a novel light guide design that does not use a dot pattern. We designed an asymmetric intensity distribution of mini-LEDs (Light Emitting Diode) and a light guide plate with a fully printed diffusion reflection on the bottom surface for a planar illuminator. The design rules for the proposed architecture are described in this paper. The archetype design with a 152.4 mm circular down-light has a diameter of 143 mm for the planar light source module. The experiment achieved a total efficiency of 85% and uniformity of 92.6%.

Fabrication of High Performance Light Guide Plate and New Design for High Luminance

2010 ◽  
Author(s):  
Takaya Fujimoto ◽  
Kenji Yamashita ◽  
Satoshi Nishida ◽  
Daiji Noda ◽  
Tadashi Hattori
Keyword(s):  
High Performance ◽  
Light Guide ◽  
Liquid Crystal Display ◽  
Light Emitting Diode ◽  
High Luminance ◽  
Light Emitting ◽  
Light Guide Plate ◽  
Guide Plate ◽  
Average Luminance ◽  
Point Light

Recently, LED (Light Emitting Diode) is paid to attention as a new source of light. However, it doesn’t turn to shine on a wide area efficiently because LED is a point light. Then, the method of the light guide plate technology used for the liquid crystal display etc, and use as the LED lighting is examined. A minute reflection dots exists bottom of the light guide plate, system is such that light comes out from the surface because the light that hits the dots break a total reflection condition. In our laboratory, the function of the diffusion seat and the condensing prism seat that is complete parts of the lighting panel was involved by optimizing shape and the arrangement of the dots, and it works on the research of the light guide plate where uniform luminescence is enabled. In the process of study, it has been understood that luminance increases by increasing the number of dots, too. Therefore, an accumulating method of piling up two or more light guide plates was proposed as a method of achieving high luminance for highly effective lighting usage, and the device was analyzed with an optical simulator. As a result of optimization, the average luminance has improved by 15%. We are starting to fabricate this high luminance light guide plate by accumulating method. If this piled light guide plate is completed and luminance is improved in accordance with the simulation, it will be possible to convert it to a higher luminance light guide plate.

Research on Law of Luminance in Light Guide Plate with Fused Micro-Prisms on Bottom Surface

2009 ◽  
Vol 29 (9) ◽  
pp. 2516-2519 ◽  
Author(s):  
陈祥贤 Chen Xiangxian ◽  
徐平 Xu Ping ◽  
黄洁锋 Huang Jiefeng ◽  
张旭琳 Zhang Xulin ◽  
王冰 Wang Bing ◽  
...  
Keyword(s):  
Light Guide ◽  
Bottom Surface ◽  
Light Guide Plate ◽  
Guide Plate

Algorithm research on microstructure distribution on the bottom surface of an integrated micro-optical light guide plate

2014 ◽  
Vol 53 (7) ◽  
pp. 1322 ◽  
Author(s):  
Ping Xu ◽  
Yanyan Huang ◽  
Zhijie Su ◽  
Xulin Zhang
Keyword(s):  
Light Guide ◽  
Bottom Surface ◽  
Light Guide Plate ◽  
Guide Plate

Fabrication of Light Guide Plate on PDMS-Based Using MEMS Technique for Application of LED-Backlight

2007 ◽  
Vol 364-366 ◽  
pp. 7-12
Author(s):  
Chao Heng Chien ◽  
Zhi Peng Chen
Keyword(s):  
Light Guide ◽  
Recent Decade ◽  
Bottom Surface ◽  
White Led ◽  
Etching Technique ◽  
Silicon Mold ◽  
Light Guide Plate ◽  
Guide Plate ◽  
Light Function ◽  
Led Backlight

Following the development of the thin-LCD, many researchers have improved the traditional backlighting module to make it thinner, lighter, and brighter which has already become the trend. The light guide plate is a very important component in backlighting module. Generally, the traditional light guide plate (LGP) is made of PMMA material. Injection molding technique is applied to fabricate the traditional LGP. In this research, Polydimethylsiloxane (PDMS) material was used to make the LGP, which was fabricated by using MEMS technique. In order to modify the traditional LGP, the micro prisms were constructed on the bottom surface of the PDMS LGP. Silicon mold was used to define the geometry of the micro-prism. Anisotropic etching technique was applied to fabricate the prism silicon mold. A liquid PDMS mixture was cast onto the prism silicon mold and the PDMS LGP was completed. White LED was utilized to be the light source of the PDMS LGP. After going through the illuminative test, PDMS LGP was demonstrated successfully of guide light function and its 77% of illuminative uniformity was achieved requirement of a general v-grooved light guide. The thickness of the PDMS LGP is easy to control and the PDMS is a heat-resistant and cheap material; therefore, the space and fabrication cost are saved. The field of MEMS has experienced rapid growth in the recent decade. In the future, the PDMS LGP can make displays thinner and brighter for thin-LCD applications.

Influence of Multiple Peak Light-emitting-diode Curing Unit Beam Homogenization Tips on Microhardness of Resin Composites

2020 ◽  
Vol 45 (3) ◽  
pp. 327-338 ◽  
Author(s):  
J Soto-Montero ◽  
G Nima ◽  
FA Rueggeberg ◽  
CTS Dias ◽  
M Giannini
Keyword(s):  
Light Guide ◽  
Profile Analysis ◽  
Light Emitting Diode ◽  
Beam Profile ◽  
Composite Resins ◽  
Bottom Surface ◽  
Light Emitting ◽  
Blue Led ◽  
Significant Difference ◽  
Light Guides

SUMMARY This study evaluated the effect of light curing unit (LCU) guide type (regular or homogenizing) on top and bottom microhardness of conventional and bulk-fill resin-based composites (RBCs). A polywave light-emitting-diode (LED) LCU (Bluephase Style, Ivoclar Vivadent AG) was used with two different light guides: a regular tip (RT, 935 mW/cm2 emittance) and a homogenizer tip (HT, 851 mW/cm2 emittance). Two conventional RBCs (Herculite Ultra [HER], Kerr Corp; Tetric EvoCeram [TEC], Ivoclar Vivadent AG) and two bulk-fill RBCs (SonicFill [SOF], Kerr Corp; Tetric EvoCeram Bulk Fill [TBF], Ivoclar Vivadent AG) were tested. Disc-shaped samples (10 mm Ø), 2-mm thick for conventional composites and 4-mm thick for bulk-fill composites were prepared. Samples were light cured according to manufacturer-recommended times. Knoop microhardness values (KHN) were obtained on the top and bottom surfaces of each specimen at locations correlated with the output of the three LED chips emitting blue (456 nm) or violet light (409 nm). Beam profile analysis using both light guides was also performed. Microhardness of each composite was analyzed using three-way analysis of variance and Tukey honestly significant difference post hoc test (α=0.05). Beam profile images showed better light distribution across the surface of the HT light guide. Use of the HT decreased KHN of HER at the locations of the blue LED chips at bottom of the sample but had no effect on the top surface. For TEC, use of HT increased KHN of all three LED locations at the top surface. Use of the HT increased KHN of SOF at locations corresponding to one of the blue and the violet LED chips at the bottom surface. For TBF, HT increased KHN at all top surface locations. All RBCs showed higher mean KHN at the top compared with the bottom surfaces. In general, all composites presented a higher KHN at the blue LED areas regardless of the surface or the tip used. Results suggest that the homogenizer light guide resulted in significantly increased microhardness at the top, in composite resins containing alternative photoinitiators; however, that effect was not observed at the bottom surfaces.

scholarly journals Research of micro-prism distribution on the bottom surface of the small-size integrated light guide plate

2015 ◽  
Vol 23 (4) ◽  
pp. 4887 ◽  
Author(s):  
Ping Xu ◽  
Yanyan Huang ◽  
Zhijie Su ◽  
Xulin Zhang ◽  
Tongzheng Luo ◽  
...  
Keyword(s):  
Light Guide ◽  
Bottom Surface ◽  
Light Guide Plate ◽  
Guide Plate

Design of a Highly-Efficient Light Guide Plate for the Edge Lighting Backlight Module

2007 ◽  
Vol 364-366 ◽  
pp. 128-131 ◽  
Author(s):  
Paul C.P. Chao ◽  
Lun De Liao ◽  
Chi Wei Chiu ◽  
Chien Yu Shen
Keyword(s):  
Light Source ◽  
Light Guide ◽  
Incident Light ◽  
Bottom Surface ◽  
Optical Efficiency ◽  
Highly Efficient ◽  
Light Guide Plate ◽  
Guide Plate ◽  
High Uniformity ◽  
Optical Films

This study develops a highly-efficient light-guide plate for edge lighting backlight module that has no optical films. The light guide plate is designed to control the angle of the incident rays to the top surface from light source, to get the highest uniformity of intensity for thin edge lighting backlight system applications. The micro-prisms of pyramidal shape on the top surface can highly-efficient collimate with the light rays. Another micro-prism of v-cut shape on the bottom surface can reflect the incident light into the front direction and mixing the rays in the lightguide plate with the high uniformity. A novel design concept of the v-cut is the regular density varies of the cut in the LGP. The modeling simulation program, employing a Monte Carlo method based on TracePro software, has optimized the shape of the pyramidal micro-prisms on the top surface and the density distribution condition of the v-cut micro-prisms on the bottom surface, also the multiple scattering characteristics. The two types of the micro-prisms at the top and bottom surface can be highly recommended for the uniformity of the brightness via the optimal design process. Future work is warranted on improving the optical efficiency by using light-emitting diodes as a light source. The backlight module will allow us to increase the optical efficiency and to lower the total cost in portable LCD applications. The study confirms that a uniformity of brightness can be achieved without using any optical films, resulting in a high uniformity of 84%.

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