Display control system

• US 4,779,083 A
• Filed: 01/31/1986
• Issued: 10/18/1988
• Est. Priority Date: 03/08/1985
• Status: Expired due to Term

• Current Assignee: Yamaha Corporation
• Original Assignee: Ascii Corp. (Kadokawa Dwango Corp.), Nippon Yusen Kabushiki Kaisha
• Inventors: Kaneko, Makoto, Ishii, Takatoshi
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US06/824,952
• Time in Patent Office: 991 Days
• Field of Search: 340/784, 340/805, 340/793, 340/767, 315/169.1, 315/169.3, 315/250, 315/217, 315/224
• US Class Current: 345/692
• CPC Class Codes: G06T 3/40 Scaling of whole images or parts thereof, e.g. expanding or contracting
• CPC Class Codes: G09G 3/2018 by time modulation using two or more time intervals
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 3/3644 with the matrix divided into sections
• CPC Class Codes: G09G 3/3685 Details of drivers for data electrodes
• CPC Class Codes: H04N 3/127 using liquid crystals

Abstract

A display control system can implement a gray-scale display of an image composed of a plurality of display dots on a display screen. A plurality of luminance data each representing an intensity level of a corresponding one of the plurality of display dots are first generated. Each luminance data is then converted into a pulse signal whose pulse number corresponds to an intensity level of the corresponding display dot represented by the luminance data. And, each display dot on the display screen is activated in accordance with a corresponding one of the thus produced pulse signals. To eliminate flicker of the display dots, the display dots on the display screen are grouped into a plurality of display sections each composed of a predetermined number of adjacent display dots, and if the display dots in one display section are equal in intensity level, these display dots are activated by the pulse signals which are equal in pulse-number but different in phase.

Claims

1. A display control system for displaying an image composed of a plurality of display dots provided on a display screen, the plurality of display dots on the display screen being grouped into a plurality of display sections, each of which has an equal number of display dots and each of said display sections including at least two adjacent display dots, comprising:

(a) luminance data generating means for generating a plurality of luminance data, each representing an intensity level of a respective one of the plurality of display dots on the display screen;

(b) conversion means, coupled to said luminance data generating means for converting each said luminance data from said luminance data generating means into a pulse signal whose pulse number corresponds to an intensity level represented by said each luminance data such that those of said pulse signals for activating display dots in a same display section are indentical in pulse number but substantially different in phase from one another when luminance data representative of intensity levels of said display dots in the same display section are identical to one another; and

(c) activation means for activating each of the plurality of display dots on the display screen in accordance with a respective one of the pulse signals fed from said conversion means.

2. A display control system according to claim 1, wherein those of said pulse signals for activating those of the display dots which are included respectively in different display sections but disposed at corresponding positions in said different display sections are identical in number and phase to one another if luminance data representative of intensity levels of said those of the display dots are the same.

3. A display control according to claim 1, wherein said conversion means comprises conversion circuits equal in number to the display dots of each display section, each of said conversion circuits corresponding to a respective one of the display dots of each of said display sections, and converting those of said luminance data representing intensity levels of the respective ones of the display dots of said display sections into the pulse signals.

4. A display control system according to claim 1, wherein said luminance data generating means comprises memory means for storing color data each representative of a color of a respective one of the display dots on the display screen, and data conversion means for converting said color data into said luminance data.

5. A display control system according to claim 1, wherein the image composed of the plurality of display dots is displayed on the display screen in a scanning manner, and wherein said conversion means converting each luminance data into the corresponding pulse signal using a predetermined number of frame cycles of the scanning of the display screen, said conversion means determining in each frame cycle in accordance with said each luminance data whether a pulse is to be outputted as said pulse signal, said activation means sequentially activating the display dots on the display screen in accordance with said pulse signals fed from said conversion means.