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

• US 6,587,120 B2
• Filed: 08/09/2001
• Issued: 07/01/2003
• Est. Priority Date: 09/30/1993
• Status: Expired due to Fees

• Current Assignee: Hitachi Maxell Limited (Hitachi, Ltd.)
• Original Assignee: Hitachi, Ltd.
• Inventors: Wakisaka, Shinji, Suzuki, Tetsuya, Uchida, Mitsutoshi, Sato, Hiroko, Hasegawa, Kazuko, Hamada, Tatsuzo, Tanaka, Toshio, Kasai, Naruhiko, Mano, Hiroyuki, Nishitani, Shigeyuki
• Primary Examiner(s): LAO, LUN YI
• Application Number:
  US09/924,583
• Publication Number:
  US 20010048418A1
• Time in Patent Office: 691 Days
• Field of Search: 345/3.1, 345/87, 345/3.2, 345/88, 345/3.3, 345/698, 345/472, 345/472.1, 345/472.2, 345/668-671, 345/673, 345/660, 348/392, 348/424, 348/448, 348/458
• US Class Current: 345/698
• 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. An information processing device that converts a resolution of display data in accordance with a resolution of a display panel, the information processing device comprising:

a lateral direction data conversion unit that enlarges and converts display data corresponding to a number of pixels in a lateral direction of the display data into display data corresponding to a number of pixels in a lateral direction of the display panel; and

a longitudinal direction data conversion unit that enlarges and converts display data corresponding to a number of lines in a longitudinal direction of the display data into display data corresponding to a number of lines in a longitudinal direction of the display panel;

wherein the lateral direction data conversion unit enlarges and converts display data of groups of M pixels in the lateral direction of the display data into display data of groups of N pixels in the lateral direction of the display panel;

wherein display data of each of the groups of M pixels is enlarged and converted into display data of a respective one of the groups of N pixels;

wherein N/M is a fraction obtained by reducing to lowest terms a fraction obtained by dividing a total number of pixels in the lateral direction of the display panel by a total number of pixels in the lateral direction of the display data;

wherein each of the M pixels is divided into N equal parts;

wherein each of the N equal parts of each of the M pixels is assigned to one of the N pixels; and

wherein the display data of each one of the N pixels is obtained by

multiplying the display data of each of the M pixels having at least one N equal part assigned to the one N pixel by a number of the N equal parts of the M pixel assigned to the one N pixel to obtain a contribution to the display data of the one N pixel from the M pixel,

adding up the contributions to the one N pixel from all of the M pixels having at least one N equal part assigned to the one N pixel to obtain a total contribution, and

dividing the total contribution by M to obtain the display data of the one N pixel.

2. An information processing device according to claim 1, wherein the longitudinal direction data conversion unit includes:

a longitudinal direction operation unit that generates display data of a plurality of intermediate lines, each of the intermediate lines being between a respective set of two longitudinally contiguous lines of the display data and being generated based on display data of the two longitudinally contiguous lines; and

a selector that inserts each of the intermediate lines between the two longitudinally contiguous lines in the respective set of two longitudinally contiguous lines.

3. An information processing device according to claim 1, wherein the information processing device converts a resolution of 640 pixels×

480 lines to a resolution of 1024 pixels×

768 lines.

4. An information processing device according to claim 1, further comprising the display panel.

5. An information processing device according to claim 1, further comprising a timing signal generation unit that generates a display timing signal for displaying display data on the display panel, the display data to be displayed on the display panel having been enlarged and converted in accordance with the resolution of the display panel by at least one of the lateral direction data conversion unit and the longitudinal direction data conversion unit.

6. An information processing device according to claim 1, wherein each of the lateral direction data conversion unit and the longitudinal direction data conversion unit enlarge and convert RGB display data by separately enlarging and converting each of R display data, G display data, and B display data.