Browse Prior Art Database

Method for Mapping Medium Resolution Graphic of Four Colors on a Two Color Liquid Crystal Display

IP.com Disclosure Number: IPCOM000061305D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Arismendi, A: AUTHOR

Abstract

Medium resolution graphic mode contains a maximum of 200 rows of 320 pels (picture elements) each, where each pel is 1 wide by 1 high. Each byte in display storage defines 4 pels as shown below: (Image Omitted) Although a Liquid Crystal Display only has black and grey as its colors, graphics can be displayed as follows: A 640x200 LCD is twice as wide as is used in medium resolution graphics. Since 2 bits defined each graphics pel and each row was 320 pels wide, this graphics data can be sent directly to the LCD to fill its 640-pel-wide rows. Therefore, what was a 1 wide, 1 high pel on a color monitor is mapped to a 2 wide, 1 high pel on the LCD. The LCD pel definition and mapping is described below: (Image Omitted) The 4 "colors" are created by the 4 different C1/C0 combinations.

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Method for Mapping Medium Resolution Graphic of Four Colors on a Two Color Liquid Crystal Display

Medium resolution graphic mode contains a maximum of 200 rows of 320 pels (picture elements) each, where each pel is 1 wide by 1 high. Each byte in display storage defines 4 pels as shown below:

(Image Omitted)

Although a Liquid Crystal Display only has black and grey as its colors, graphics can be displayed as follows: A 640x200 LCD is twice as wide as is used in medium resolution graphics. Since 2 bits defined each graphics pel and each row was 320 pels wide, this graphics data can be sent directly to the LCD to fill its 640-pel-wide rows. Therefore, what was a 1 wide, 1 high pel on a color monitor is mapped to a 2 wide, 1 high pel on the LCD. The LCD pel definition and mapping is described below:

(Image Omitted)

The 4 "colors" are created by the 4 different C1/C0 combinations. The alternating OFF/ON or ON/OFF pels for C1 and C0 give the illusion of a dark grey tone. Color separation is achieved by the borders created with areas of distinct colors, i.e., C1/C0 combinations, which lie adjacent to each other. With this LCD graphics mapping scheme, an application program using medium resolution graphics can be transported to execute directly on a 640x200 LCD with no alteration of its graphics data.

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