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Display control device

A display device and display control technology, applied in the direction of digital output to display devices, static indicators, cathode ray tube indicators, etc., can solve the problems of large load, narrow selection, and uncommon use.

Inactive Publication Date: 2003-07-09
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the CPU is required to rewrite the entire content of the BPRAM corresponding to the scrolling display line every time a pixel is moved, thus placing a considerable load on the CPU.
[0007] Moreover, the present inventors found that when the liquid crystal display control device is operated under the control of a CPU such as a microcomputer or a data processor, since the interface program for reading / writing data in the display RAM and controlling data transmission is not common , and the CPU tends to be subject to a heavy load such that the choice of any CPU that can be used to control this type of liquid crystal display control device is narrowed

Method used

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Embodiment Construction

[0052] figure 1 It is a block diagram of a system using the liquid crystal display control device of the present invention. The system has (not limited to) a liquid crystal display control device 2 as a data processor or a CPU (Central Processing Unit) of a microcomputer to control the operation of the liquid crystal display device 2 and a liquid crystal display (also called an LCD screen) 3 . Liquid crystal display control device 2 has display RAM (random access memory) 4, is used for storing the character code of the actual character on liquid crystal display screen, and character generator ROM (read-only memory) 5, is used for by the character code of appointment Generate font graphics in the form of dot matrix.

[0053] The liquid crystal display screen 3 is composed of a dot matrix (not limited thereto), and a 1-dot liquid crystal display element is formed at each intersection of a common electrode (not shown) as a scan electrode and a line segment electrode as a signal ...

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Abstract

CPU writes display character codes corresponding to a liquid crystal display position to display RAM to cause any desired character to be read from character generator ROM and to be displayed. There are provided a scroll display line designation register for designating a desired display line to be scrolled and a scroll dot quantity register for designating the scroll quantity in pixels. A scroll register supplies, to a segment shift register, character data which is delayed by the designated number of dots with respect to the character data on the designated display line and causes the display line to be displayed.

Description

[0001] This application is a divisional application of the invention patent application titled "Display Control Device" with the application number 94119367.5 filed by the applicant on December 5, 1994. technical field [0002] The present invention relates to display control technology, more specifically, relate to the rolling screen technology that is used in such as liquid crystal drive control, fluorescent tube drive control, can be effectively applied to liquid crystal control device, by utilizing such as character generator ROM (read-only memory) Display characters in dot matrix. Background technique [0003] A liquid crystal display device using a character generator as a display control form includes: a display RAM (hereinafter referred to as "DDRAM") for storing character codes, a character generator RAM or ROM (hereinafter referred to as "DDRAM") for storing character types such as radicals "CGRAM or CGROM"), which is used to read the display address counter of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/14G02F1/133G06F3/0485G09G3/20G09G3/36G09G5/34
CPCG09G5/343G09G3/3611G09G5/34G09G2310/0286
Inventor 横田善和坂卷五郎谷邦彦
Owner RENESAS ELECTRONICS CORP
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