济南广告字恒流驱动电路的设计分析

页面更新时间:2015-08-19 10:10 来源:未知 作者:admin 点击:
济南广告字是80年代后期在全球迅速发展起来的新型信息显示媒体,它利用发光二极管构成的点阵模块或像素单元,组成大面积显示屏幕,以其可靠性高、使用寿命、环境适应能力强、性能价格比高、使用成本低等特点, 在信息显示领域已经得到了非常广泛的应用。
 
Ji'nan is a new type of information display media, which is rapidly developing in the world in the late 80 "s, it uses the dot matrix module or pixel unit, which is composed of a large area display screen, which has been widely used in the field of information display, which is characterized by high reliability, high service life, high performance price ratio and low cost.
 
济南广告字主要包括发光二极管构成的阵列、驱动电路、控制系统及传输接口和相应的应用软件等,其中驱动电路设计的好坏,对济南广告字的显示效果、制作成本及系统的运行性能起着很重要的作用。所以,设计一种既能满足控制驱动的要求,同时使用器件少、成本低的控制驱动电路是很有必要的。本文就常规型驱动电路的设计作些分析并提出恒流驱动电路的设计方式。
 
Ji'nan advertising word mainly includes a light-emitting diode array, driver circuit, control system and transmission interface and the corresponding application software, etc., in which the driving circuit design is good or bad, the display effect, production cost and the operating performance of the system plays an important role in Ji'nan. Therefore, it is necessary to design a kind of control device which can meet the control requirements, while using less components and low cost. In this paper, the design of the conventional driving circuit is analyzed and the design method of the constant current driving circuit is presented.
 
2 、济南广告字常规驱动电路的设计
 
2. The design of the regular driving circuit of Ji'nan advertising word
 
济南广告字 / 驱动电路的设计,与所用控制系统相配合,通常分为动态扫描型驱动及静态锁存型驱动二大类。以下就动态扫描型驱动电路的设计为例为进行分析:
 
The design of the driving circuit of the Ji'nan advertising word, which is matched with the control system, is usually divided into two categories, which are dynamic scan mode and static lock type. The design of dynamic scanning drive circuit is analyzed in the following example:
 
动态扫描型驱动方式是指济南广告字上的4行、8行、16行等n 行发光二极管共用一组列驱动寄存器, 通过行驱动管的分时工作,使得每行led的点亮时间 占总时间的1/n ,只要每行的刷新速率大于50Hz,利用人眼的视觉暂留效应,人们就可以看到一幅完整的文字或画面。
 
Dynamic scanning type driving method is refers to the advertising words in Jinan 4, 8, 16, n light emitting diode share a set of columns drive the register, the drive pipe work, the time for each line of the LED light accounted for 1 / N of the total time, as long as each line of the refresh rate is greater than 50 Hz, using the persistence of vision effect, people can see a complete picture of the text or picture.
 
常规恒流型驱动电路的设计一般是用串入并出的LED显示屏专用集成电路芯片如MBI5026等作为列数据锁存、列驱动,以PMOS管如APM4953等作为行扫描管。
 
Conventional constant flow pattern drive circuit design is generally used to string into and out of the LED display specific integrated circuit chip such as MBI5026, as a column data latch, column driver, PMOS tube, such as APM4953, and so as a line scan tube.
 
如以1/4扫单色点阵、16 行×32 列为一个基本单元,则需用8 片MBI5026、8个APM4953行扫描管(如一个通道带2行,则使用4个 即可)。 其工作原理为:将八片MBI5026级连,共用一个串行时钟CLK及数据锁存信号STR,当第一行需要显示的数据经过8×16= 128 个 CLK时钟后将全部移入MBI5026中,此时产生一个数据锁存信号STR,使数据锁存在MBI5026的后级锁存器中,在由芯片内部的输出驱动器通过电 流量调节器输出预设的电流值到对应的列。
 
Such as 1/4 scan monochrome dot matrix, 16 row x 32 as a basic unit, you need 8 MBI5026, 8 APM4953 line scanning tube (such as a channel with 2 lines, then use 4 can). Its working principle is: the eight MBI5026 level even, sharing a serial clock CLK and data latch signal STR, when the first line need to display the data after 8 x 16= 128 CLK clock will be all moved into STR, this time to generate a data latch signal MBI5026, so that the data lock in the MBI5026 after the output drivers through the electric flow regulator output preset current value to the corresponding column.
 
同时由行扫描控制电路产生信号使第一行扫描管导通,相当于第一行LED的正端都接高平,显然第一行LED管子的亮灭就取决于SUM2016中所锁存的 信号;在第一行LED管子点亮的同时,在MBI5026中移入第二行要显示的数据,随后将其锁存,并同时由行扫描控制电路将第一行扫描管关闭而接通第二 行,使第二行LED 管子点亮。以此类推,当第四行扫描过后再回到第一行,只要扫描速度足够高,就可形成一幅完整的文字或图像。
 
While the line scan control circuit generates a signal to make the first line of LED, the positive end of the first line of MBI5026 is connected to the first line of the LED tube is illuminated by the SUM2016 in the first row of the LED tube light, while the second line to display the data, and then the control circuit will be switched on the first line scan line second lines, so that second lines LED tube light. By analogy, when the fourth line scan after go back to the first line, as long as the scanning speed is high enough, to form a complete picture of the text or image.