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Projection Display

IP.com Disclosure Number: IPCOM000041725D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Golledge, I: AUTHOR [+2]

Abstract

This article relates to the optical and mechanical structure of a small projection display employing a liquid-filled passive display module which is illuminated through a sidewall. The module is supported on a plinth beneath a lens mounting ring set in a box casing. The module includes a number of projecting integral pillars which locate on the lens mounting ring to give precise spacing and alignment of the surface of the display element with the lens. As shown in more detail in Fig. 1, an electrochromic display cell 10 consists of a transparent sidewall 11, made of acrylic material, which includes a side light guide portion 12. An array of display electrodes is formed on the upper surface of a silicon wafer 13 which is supported by an anodized aluminum plate 14 and sealed to the lower edge of wall 11 with an O-ring gasket.

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Projection Display

This article relates to the optical and mechanical structure of a small projection display employing a liquid-filled passive display module which is illuminated through a sidewall. The module is supported on a plinth beneath a lens mounting ring set in a box casing. The module includes a number of projecting integral pillars which locate on the lens mounting ring to give precise spacing and alignment of the surface of the display element with the lens. As shown in more detail in Fig. 1, an electrochromic display cell 10 consists of a transparent sidewall 11, made of acrylic material, which includes a side light guide portion 12. An array of display electrodes is formed on the upper surface of a silicon wafer 13 which is supported by an anodized aluminum plate 14 and sealed to the lower edge of wall 11 with an O-ring gasket. The top cover of the cell is a glass plate 15, sealed against the upper edge of wall 11 by another O-ring gasket. Clamping pressure is provided by a frame 16 which is bolted to the support plate 14 through bores (not shown) in the wall 11. The cell is filled with an electrolyte which contains an electrochromic substance, in solution, which may be deposited upon energized display electrodes to form an image. When such an image is formed on the wafer 13, the display area is illuminated by lamp 20 via side light guide 12. Light is scattered from the display area through cover glass 15 into the projection lens 30. The lens 30 is adjustably supported in a mounting ring 31 which is itself keyed, at 32, into an outer rigid cas...