Liquid crystal display system capable of reducing and enlarging resolution of input display data

• US 20010048418A1
• Filed: 08/09/2001
• Published: 12/06/2001
• Est. Priority Date: 09/30/1993
• Status: Active Grant

• Current Assignee: Hitachi Maxell Limited (Hitachi, Ltd.)
• Original Assignee: Hiroko Sato, Hiroyuki Mano, Kazuko Hasegawa, Mitsutoshi Uchida, Naruhiko Kasai, Shigeyuki Nishitani, Shinji Wakisaka, Tatsuzo Hamada, Tetsuya Suzuki, Toshio Tanaka
• Inventors: Tanaka, Toshio, Wakisaka, Shinji, Suzuki, Tetsuya, Uchida, Mitsutoshi, Hasegawa, Kazuko, Hamada, Tatsuzo, Kasai, Naruhiko, Mano, Hiroyuki, Nishitani, Shigeyuki, Sato, Hiroko
• Granted Patent: US 6,587,120 B2
• Time in Patent Office: Days
• US Class Current: 345/87
• CPC Class Codes: G09G 2340/0414 Vertical resolution change
• CPC Class Codes: G09G 2340/0421 Horizontal resolution change
• CPC Class Codes: G09G 2360/02 Graphics controller able to handle multiple formats, e.g. input or output formats
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

A liquid crystal display system which can accept input display data having a resolution which is larger (e.g. 1120×780 dots) or smaller (e.g. 640×480 dots) than a resolution of a liquid crystal panel (e.g. 1024×768 dots), and convert the input display data to reduced or enlarged display data for display on the liquid crystal panel. The system generates, for example, one new vertical or horizontal line based on two contiguous vertical or horizontal lines in the input display data. If the resolution of the input display data is larger than the resolution of the liquid crystal panel, the system replaces the two contiguous lines with the one new line. If the resolution of the input display data is smaller than the resolution of the liquid crystal panel, the system inserts the one new line between the two contiguous lines.

Claims

1. A method of converting first display data in a raster scan format having a first resolution received from an external system into second display data for a liquid crystal display having a second resolution different from the first resolution, said method comprising the steps of:

a) generating data for n vertical or horizontal lines based on specific m vertical or horizontal lines contiguous to each other of the first display data, where m is an integer of two or greater and n is an integer less than m;

b) repeating at least one of the following steps c) and d) as many times as required in sequence at different positions on a screen of the liquid crystal display;

c) replacing k (n<

k≦

m) lines of the m vertical or horizontal lines with the n vertical or horizontal lines; and

d) adding the n vertical or horizontal lines to the m vertical or horizontal lines.