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Effect of Height and Radius(h/r)Ratio of micro lens array Pattern on the Light Extraction of OLEDs

MOLECULAR CRYSTALS AND LIQUID CRYSTALS 2011年第1期550卷 278-283页

作者： Lee, Hyung Jin Bae, Heung Kwon Kim, Bo-Sung Park, Lee Soon Son, Chang Gyun Kwon, Jin Hyuk Kyungpook Natl Univ Dept Sensor Display Engn Taegu 702701 South Korea Kyungpook Natl Univ Dept Polymer Sci Taegu 702701 South Korea Mobile Display Res Ctr Taegu 702701 South Korea Yeungnam Univ Dept Phys Gyongsan South Korea

In this paper we discussed the effect of micro lens array(MLA) pattern fabricated on the glass substrate of organic light emitting diode(OLED) for improvement of light extraction efficiency. The MLA patterns were formed by combination of photolithography and thermal reflow method and its effect on light extraction efficiency form OLED device was examined.

关键词： Organic Light Emtting Diode OLED Light extraction efficiency micro lens array

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To enhance light extraction of OLED devices by multi-optic layers including a micro lens array 18

To enhance light extraction of OLED devices by multi-optic l...

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Conference on Organic Light Emitting Materials and Devices XVIII

作者： Chiu, Chuang-Hung Chien, Chao-Heng Kuo, Yu-Xaong Lee, Jen-Chi Chunghwa Picture Tubes LTD Taiwan Chunghwa Taiwan Tatung Univ Dept Mech Engn Taipei Taiwan

ISBN: (纸本)9781628412109

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.

关键词： light extracting efficiency micro lens array OLED

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Effect of Height and Radius(h/r)Ratio of micro lens array Pattern on the Light Extraction of OLEDs

Effect of Height and Radius(h/r)Ratio of Micro Lens Array Pa...

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14h International Symposium on Advanced Display Materials and Devices (ADMD)

关键词： Organic Light Emtting Diode OLED Light extraction efficiency micro lens array

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Improvement on the surface roughness of micro lens array in the excimer laser machining process

Improvement on the surface roughness of micro lens array in ...

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Conference on MOEMS and Miniaturized Systems II

作者： Wang, SY Huang, CS Chou, HY Lee, TY Chang, RS Precis Instrument Dev Ctr Hsinchu 30077 Taiwan

ISBN: (纸本)0819442895

A new process that improves the surface roughness of micro lens array after the excimer laser machining is studied. The results show that the smoother surface has been fabricated by this innovatory method. The excimer laser with mask projection machining has been successfully applied for the fabrication of 2.5D micro parts. Furthermore, the workpiece dragging machining is capable of manufacturing microstructure array with curved surface by using various shape of mask. But during the machining process, the laser is cutting shoot by shoot and the material is gradually removed layer by layer. The laser mark on the curved surface of micro lens array is obvious and inevitable. This defect limits the product of dragging in real optical application. To overcome this drawback, an improved process is studied. When the desired shape of lens array was machined by the excimer laser machining, the attaching photo resist with the thickness of several micro meter is coated on the rough surface by spin coating or spraying. Then the lens array is baked to get the mirror surface. This original method combines the advantage of the higher fill factor and the smoother surface for the fabrication of micro lens array.

关键词： excimer laser machining micro lens array mirror surface

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Thin micro lens array realizing wide and uniform illumination 13

Thin micro lens array realizing wide and uniform illuminatio...

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Conference on Advanced Fabrication Technologies for micro/Nano Optics and Photonics XIII

作者： Matsuo, Takeshi Takaoka, Toshimitsu Arai, Sho Kitagawa, Seiichiro NALUX CO LTD Yamazaki 2-1-7 Shimamoto Osaka 6180001 Japan

ISBN: (纸本)9781510633483

In recent years, Time-of-Flight (TOF) camera technology is widely adopted for 3D mapping and motion gestures. TOF camera generally consists of light emitting and receiving elements. The micro lens array (MLA) which had been commercialized as a lens for light projection for TOF camera could be made of a resin with a product size of 6 x 5 x 0.85 mm while the projection range was 120 degrees and the light amount unevenness was 10 % or less. In general, a plurality of lenses in MLA are regularly arranged, and this arrangement causes light interference. Since the light amount unevenness occurred due to the interference, the unevenness could be reduced by arranging the lenses at random in three axes. The light amount unevenness was also caused by transfer errors that occurred in the molding process. The shape error of lens was controlled to nanometer-size by developing a correction process that functioned the shape error and adapted it to mold processing. Although a high refractive resin was used to widen the projection angle, it was difficult to manufacture a thin lens by injection molding because of the high viscosity. This problem was also solved by developing a heating and cooling method in the molding process. As a result, by optimizing the lens arrangement and controlling the error of the lens shape, the light amount unevenness of projection could be suppressed to 10% or less.

关键词： micro lens array TOF Ultra-precision processing

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Homogenization of power intensity based on micro lens array in optical wireless communication systems 17

Homogenization of power intensity based on micro lens array ...

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17th International Conference on Optical Communications and Networks (ICOCN)

作者： Mu, Xin Wei, Zixian Wu, Sailong Chen, Zhenmin Dong, Ying Fu, H. Y. Tsinghua Univ TBSI Shenzhen Guangdong Peoples R China Tsinghua Univ Grad Sch Shenzhen Div Adv Mfg Shenzhen 518055 Guangdong Peoples R China

ISBN: (数字)9781510627710

ISBN: (纸本)9781510627710

For systems based on array source, owing to discrete single sources in the array, variation in power intensity can usually be detected as the receiving end moves. Although uniform illumination in lighting system has been widely investigated, its implemented light sources are commonly LEDs with Lambertian distribution. We further study an optical design applied for optical wireless communication system with VCSEL in this article. The optical system mainly consists of collimating lens and micro lens array to homogenize power intensity of the communication system based on VCSEL array source which has a Gaussian distribution. Our proposed scheme was verified with commercial optical design software Zemax. The simulation result shows that illumination uniformity can reach up to 91% after passing through this optical system, which can fulfill the requirements of high power uniformity in practical applications. The homogenization of power intensity solves the issue of signal power variation at the moving receiver end in optical wireless communication system, which guarantees stable communication link and robust system performance.

关键词： Beam homogenization micro lens array optical design optical wireless communication

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Fabrication of a micro lens array with a High Filling factor Using a Direct Molding Method

Fabrication of a Micro Lens Array with a High Filling factor...

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15th International Conference on Advances in Materials and Processing Technologies (AMPT)

作者： Huang, Chien-Yao Chen, Chun-Chieh Chou, Hsiao-Yu Pen, Wei-Long Lin, Yu-Wei 1001 Daxue Rd Hsinchu 300 Taiwan

ISBN: (纸本)9783037859216

In recent years, micro lens arrays have played a crucial role in optical illumination systems. The function of micro lens arrays (MLAs) is to create a uniform light intensity or shape the light profile. Polymers that are commonly used as MLAs have several advantages, such as cost effectiveness, light weight, and easy formation. In general, the ultra-precision diamond-turning technique and plastic injection molding technique have been combined to fabricate MLAs with polymer materials. However, residual stress and non-balance injection pressure are produced on MLAs during injecting processing. Therefore, this paper presents the fabrication of MLAs using a direct molding method (DMM). The STAVAX with electroless nickel coating and PMMA were used as the mold and polymer preform, respectively. First, a mold of MLA with 100% filling factor was fabricated using the ultra-precision diamond-turning technique. A high filling factor can decrease the non-effective area of the MLA in an optical system. Subsequently, an MLA was formed on the PMMA surface using DMM processing. This paper shows the DMM process parameters, including molding temperature, molding force, and cooling rate. Moreover, the profile of the MLA was measured using a laser confocal microscope. Finally, a high filling factor MLA with a diameter of 11.5 mm, and lenses with a height of 8.5 mu m and a radius of 470 mu m were formed on PMMA.

关键词： Direct molding method micro lens array PMMA precision diamond turning

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Light field imaging based on electrically tunable nematic liquid crystal micro lens array 4

Light field imaging based on electrically tunable nematic li...

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4th Seminar on Novel Optoelectronic Detection Technology and Application

作者： Hui, Li Jing, Peng Fan, Pan Wu Yuntao Zhang Yanduo Xie Xiaolin Wuhan Inst Technol Sch Comp Sci & Engn 693 Xiongchu Ave Wuhan 430073 Hubei Peoples R China Huazhong Univ Sci & Technol Sch Chem & Chem Engn 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China Wuhan Inst Technol Coll Post & Telecommun 693 Xiongchu Ave Wuhan 430073 Hubei Peoples R China Hubei Key Lab Intelligent Robot 693 Xiongchu Ave Wuhan 40073 Hubei Peoples R China

ISBN: (数字)9781510619487

ISBN: (纸本)9781510619487

A light field imaging system based on electrically tunable nematic liquid crystal (LC)-micro lens array (MLA) is proposed. In this system, a LC-MLA is utilized to replace the conventional glass MLA. The LC-MLA has an advantage of electrically controlled without any mechanical movements. This feature could extend depth of field (DOF) of the LC-MLA. In the measurements, the relationship between the external applied voltage and the focal length of the LC-MLA is discussed. The point spread function (PSF) of the LC-MLA is given. An interesting experiment for measuring the direction of the incident light is presented. Those measurements show that the proposed LC-MLA has greatly potential in light field imaging system.

关键词： Light field imaging liquid crystal micro lens array

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A design method of gap filling type micro lens array to improve homogeneity and maintain efficiency 15

A design method of gap filling type micro lens array to impr...

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Conference on Nanoengineering - Fabrication, Properties, Optics, and Devices XV

作者： Yang, Daewoong Oh, Eunsong Song, Ho-Young YNG Inc Res & Dev Dept 357 Guseong Ro Yoingin Si 16914 South Korea

ISBN: (数字)9781510620322

ISBN: (纸本)9781510620322

micro-lens array (MLA) for diffusing incident light has been widely used for 3D depth measurement. Especially in Time-of-Flight (TOF) 3D sensor, output beam uniformity through the MLA is one of the most important factors to determine the sensor accuracy. This performance is highly related to a MLA lens structure. Randomized MLA, a substitute for regular periodic MLA, does not overcome a low diffusing efficiency due to the leaking light. To tackle this issue, we propose a new MLA design methodology which is comprised of various unit lenses having different curvatures and sizes (hereafter referred to as the "Mini-lens" ). The design method is to randomly overlap a sub lens having different curvatures and sizes into the regular periodic arrange. The Mini-lens type MLA shows a non-periodic structure and no height difference. The experiments with our design show similar to 30% improvements in uniformity and efficiency compared to the regular periodic MLA and the randomly distributed MLA, respectively. New Mini-lens can achieve a fill factor of 100% over various designed base and sub lens. In addition, the suggested methodology will be useful for designing all the structures that are difficult to arrange apart from rectangular and hexagonal type. Our methodology will be a new design method to overcome the limitation of its structure.

关键词： micro lens array Diffuser 3D recognition sensor TOF sensor

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Designing Freeform micro lens array With Prescribed Luminous Intensity for LCD Backlight Units

IEEE PHOTONICS JOURNAL

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IEEE PHOTONICS JOURNAL 2023年第3期15卷 1页

作者： Zhu, Zhengbo Yang, Le Ma, Donglin Huazhong Univ Sci & Technol Sch Opt & Elect Informat Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol MOE Key Lab Fundamental Phys Quant Measurement Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol Hubei Key Lab Gravitat & Quantum Phys PGMF Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol Sch Phys Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol Tongji Hosp Tongji Med Coll Dept Emergency MedDept Crit Care Med Wuhan 430030 Peoples R China

The precise luminous intensity control for liquid crystal display (LCD) backlight units is an important issue that has not been well addressed in current research. A proper luminous intensity distribution can significantly enhance the viewing experience. In this paper, we propose a method for designing a freeform micro lens array that is capable of producing a prescribed luminous intensity distribution for direct-lit LED backlight module. As the luminous intensity distribution is usually need to be constrained within a quadrilateral pyramid region, a special coordinate system is developed by scanning two semicircles containing light rays along the X axis and Y axis to provide a flexible model for luminous intensity tailoring. Further, we convert the luminous intensity design problem to a specific illuminance problem by using a lossless energy conversion strategy. Then, an integrable ray mapping between the source domain and the target domain is established to implement the freeform optics design to regulate the converted illuminance distribution. The effectiveness of the proposed method is verified via various design examples including on-axis configuration and axis-off configuration, the influence of the LED size on the optical performance is also analyzed.

关键词： Liquid crystal displays Light emitting diodes Light sources Optics Lighting lenses Optical imaging Backlight system freeform optics design LED micro lens array

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