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2024年6月22日发(作者:)
Design of LED Display Control System Based on
AT89C52 Single Chip Microcomputer
Institute of Machinery, on 5 February 2004
Maurice Wilkes
ABSTRACT :THIS paper introduces display design process about hardware
and software based on AT89C52 single chip microcomputer. We use a simple
external circuit to control the display screen,which size is 32 × 192. The display
screen also can display the size of the six 32 × 32 dot matrix Chinese characters by
a dynamic scan mode, and can be divided into two small display screens, which
can display twenty-four Chinese characters whose size is 16×16. We can modify
the code to change the content of the display, subtitles can achieve scrolling
function and the scroll speed can be adjusted according to requirements, subtitles
can also achieve pause function. The Chinese character code stored in external
data memory, the capacity of data memory is expanded according to the
requirements of Chinese characters we want to show. This display screen has
advantages of small volume, few hardware and simple circuit structure.
KEY WORDS: LED, Chinese Character Display, AT89C52
I. INTRODUCTION
LED display has become an important symbol of the city lighting,
modernization and informationsociety with continuous improvement and
beautification of people’s living environment. LED lights can be seen in the large
shopping malls, railway station, docks, underground station, and a variety of
management window and so on. LED business has become a fast-growing new
industry, a huge market space and bright prospects. The text, pictures, animation
and video are displayed by LED’s light, and content can be changed. Some
components are the display devices of the modular structure, and which usually
consists of a display module, control system and power system. The display
module is constituted by the lattice structure which consists of LED, and is
responsible for light-emitting display; the screen can display text, pictures, video
and so on by control system which can control light or dark of LED in the
corresponding region; Power system is responsible for transforming input voltage
an d current into voltage and current which the screen needs. LED dot matrix
display extracted display character font through PC, and sent to the
microcontroller, then displayed in the dot matrix screen, which mainly used for
display of indoor and outdoor characters. LED dot matrix display can be divided
into graphic display, image display and video display by displayed content.
Compared with the image display,the characteristics of graphic display is no
difference in gray color whether it is monochrome or color display. Therefore,
graphic display also fails to reflect the richness of color, and video display can not
only show exercise, clear and full-color images but also show television and
computer signals. Although there are some differences between the three, but the
most basic principles are similar.
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