wk 13 LIGA

wk 13 LIGA - Digital Display, LIGA, and Other...

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Digital Display, LIGA, and Other Miniaturization David T. Shaw 11/24/09
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LCD Display Technology
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LCD There are many modes operation TN 90 deg twist STN 270 deg twist IPS in plane switching MVA multidomain vertival alignment OCB optically self compensated birefringence
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LCD Imaging Process
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A Close Cousin? (Venetian Blinds)
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What’s Ahead for TFT LCDs Size - 82” TFT LCD panels achieved Resolution - 1920x1080 has been achieved LCD has taken over the flat panel market to 32” 32” - 42” is the current LCD - plasma battleground Market prices falling as new, larger fabs start up Some plasma manufacturers hedging bets with LCD (Samsung, LG, Panasonic, Hitachi, CPT)
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Plasma Display Technology
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Gas Plasma Discharge Principle
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Structure of a PDP
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A Close Cousin? (Fluorescent Lamps)
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What’s Ahead for Plasma Has conceded 32” and smaller market due to prices and mass availability of LCD Longevity - est. 30,000 - 60,000 hours Size - 80” current production max, >100” possible Resolution - HDTV (1920x1080) at 65” and above 42” EDTV plasma was the ‘hot’ product for 2004-2005 holiday selling seasons Gradual shift to 42-inch HD plasma * Range of PDP manufacturer’s claims
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Digital Displays
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The DMD is an array of several lakhs of aluminium mirrors, each of which acts as a light switch. It is a MEMS device. Digital Mirror Device
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Problems (Do not submit) What is operational principles of GLV? How can GLV be used to build laser-base TV in the future (See the paper in the COURSE DOCUMENTS; search the literature). What are the technical issues which need to be overcome before we see laser-based TVs on the market?
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LIGA is the German acronym for… Lithography ( Li thographie), Electro-deposition ( G alvanoformung), Molding ( A bformtechnik)
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MEMS Technologies for Fabrication There are several standard methods for fabricating MEMS devices that employ many of the same methods used for microelectronics. These methods are: 1. Bulk micromachining —uses chemical etches of materials to produce articulated MEMS features that may be very thick. 2. Surface micromachining —uses microelectronic processes to produce thin film MEMS structures. 3. LIGA —a specialized method for producing very thick structures with high aspect ratios (ratio of lateral size to height).
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Comparison of MEMS Technologies Capability Bulk Micromachining Surface Micromachining LIGA Conventional Machining Min feature size few microns ~ 1 micron few microns ~ 25 microns Device thickness > 1 mm few microns > 1 mm unlimited Lateral size > 1 mm ~ 1 mm > 1 mm unlimited Materials used limited to Si-based microelectronic Electroplated metals or injection molded plastics virtually unlimited Scalability limited scalable limited scalable Assembly requirements assembly required assembled in situ assembly required assembly required Integration to microelectronics yes (SOI processes)
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This note was uploaded on 02/19/2011 for the course EE 515 taught by Professor Dr.shaw during the Fall '10 term at SUNY Buffalo.

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wk 13 LIGA - Digital Display, LIGA, and Other...

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