Date: Thu, 11 Oct 2001 20:26:20 From: "neil barnes" <[EMAIL PROTECTED]> Subject: Re: [LIB] Nuts and bolts of impoving LCD
>Date: Thu, 11 Oct 2001 19:41:23 +0000 >From: "Matthew Hanson" <[EMAIL PROTECTED]> >Subject: Re: [LIB] Re: [LIBRETTO] Re: Nuts and bolts of impoving LCD > Matt, I just found an interesting comment in a web site by densitron (who make custom LCDs) at http://www.densitron.com/product/lcd/custom/culcdglass.html The relevant bit is: ------ Densitron custom LCD panels can be designed to operate in a variety of viewing modes to allow operation in any lighting condition, from direct sunlight to total darkness. The polarizers used and the LCD panel construction determine the viewing mode of the LCD. There are three elements which contribute to the LCD viewing mode. These are the polarizer type, the display image and the preferred viewing direction. The customer needs to define these elements and indicate them on the Custom LCD Design Form. Below is a discussion of these elements. LCD's have the ability either to reflect ambient light, to transmit a backlight, or to do both. These operating modes are determined by the type of polarizer film applied to the rear glass plate of the LCD panel. Reflective LCD's have a full reflector attached to the rear polarizer and cannot be backlit. They are often used in battery-powered application and provide the best contrast in high ambient light conditions. Transflective LCD's have a partially reflecting film attached to the rear polarizer and can either reflect ambient light or transmit EL, LED, fluorescent or incandescent backlights. They provide the most versatile viewing mode with only a slight reduction in contrast. Transmissive LCD's do not have any reflective properties and must be used with a backlight. Depending on the backlight brightness, they can be used in well-lit indoor environments as well as dark conditions, however, this mode is not recommended for daylight usage. Transmissive LCDs offer a different appearance for typical LCD's, bringing a light emitting look to the product. ---- This suggests that the beastie might benefit in daylight by the addition of a semisilvered layer between the lamp and the rear polarizer (at the cost of some contrast)...how brave do you feel? It occurs to me that metallised Mylar might be a suitable semi-silver source without any thickness problems. Neil (recovering from 24 handwritten pages in the exam!) _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp ************************************************************** http://libretto.basiclink.com - Libretto mailing list http://libretto.basiclink.com/archive - Archives http://www.picante.com/~gtaylor/portable/faq.html - FAQ -------TO UNSUBSCRIBE------- Reply to any of the list messages. The reply mail should be addressed to: [EMAIL PROTECTED] - Then replace any text on the message's subject line: cmd:unsubscribe --------TO UNSUBSCRIBE DIGEST------ Do above but with this on subject line: cmd:unsubscribe digest **************************************************************
