【正文】 display device is posed of many: evenly posed of light emitting diode matrix display module, suitable for broadcast text, images of information. LED video display: display device is posed by many lightemitting diodes, video, animation shows various video files. 3, by using occasions classification Indoor display: light point is lesser, general Φ 3mm Φ 8mm, display area of general several ten square meters to. Outdoor screen area to several hundred square meters general dozens, high brightness, can work under the sun, in the wind, rain, waterproof function. 4 points, according to the classification of light in diameter Indoor screens: Φ 3mm, Φ mm, Φ 5mm, Outdoor screen: Φ 10mm, Φ 12mm and Φ 16mm Φ, 19mm, Φ 20mm, Φ 21mm, Φ 22mm, Φ 26mm The basic unit of the light outdoor screen for led light cone tube, the principle is a group of red, green, and blue light emitting diode sealed in a plastic tube in mon 5. Display horizontally scrolling, static, vertical scroll and flip shows, etc. Single block module control drive 12 (maximum control and block), 16X48 matrix 8X8 matrix (or 32X48 matrix), is a single block of MAX7219 (or PS7219, HD7279, ZLG7289 8279 and other similar LED display driver module) 12 times (or 24 times)! Can use cascade means any bitmap big screen posed. Show good effect, low consumption, and the cost of using MAX7219 circuit is lower. The LED display inspection method, See appearance, specifications, screen body flatness, screen the attachment within 2 look bad, after the light screen is not in scope, the screen (generally now basically no) Color consistency, displays text display is normal, the picture to screen, fullcolor play white, red, green and blue. Technical advantage Existing mon indoor fullcolor scheme parison: 1 the matrix modules: design, color dot matrix LCD by indoor artifacts Advantage: the cost of raw materials, production and processing of the most advantage of simple process, quality is stable. Faults: color consistency, Mosaic phenomenon, serious effect. 沈陽工程學(xué)院畢業(yè)設(shè)計(jì)（論文） 4 2. Single lamp schemes for solving the bitmap screen color: for outdoor screen technology, a scheme of pixels, outdoor multiplexing technique (also called pixel sharing technology, virtual pixels to indoor display technology) transplantation. Advantage: color consistency than bitmap module of good way. Weakness: the effect not beautiful, color mixing, horizontal Angle and have off color. Process is relatively plex, antistatic high. Actual pixel resolution do 10,000 more difficult. Features ? Compatible with MCS51174。半導(dǎo)體晶片由兩部分組成，一部分是 P 型半導(dǎo)體，在它里面空穴占主導(dǎo)地位，另一端是 N 型半導(dǎo)體，在這邊主要是電子。 PN 結(jié)施加反向電壓時(shí)，少數(shù)載流子難以注入，故不發(fā)光。 對于一般照明而言，人們更需要白色的光源。 上個(gè)世紀(jì) 60 年代，科技工作者利用半導(dǎo)體 PN 結(jié)發(fā)光的原理，研制成了 LED 發(fā)光二極管。 LED 之所以受到廣泛重視而得到迅速發(fā)展，是與它本身所具有的優(yōu)點(diǎn)分不開的。 LED 視頻顯示屏：顯示器件是由許多發(fā)光二極管組成，可以顯示視頻、動畫等各種視頻文件。顯示效果好，功耗小，且比采用 MAX7219 電路的成本更低。 優(yōu)勢： 色彩一致性比點(diǎn)陣模塊方式的好。 AT89C52 具有以下標(biāo)準(zhǔn)功能： 8k字節(jié) Flash， 256 字節(jié) RAM，32 位 I/O 口線，看門狗 定時(shí)器， 2 個(gè)數(shù)據(jù)指針，三個(gè) 16 位定時(shí)器 /計(jì)數(shù)器，一個(gè) 6 向量 2級中斷結(jié)構(gòu)，全雙工串行口，片內(nèi)晶振及時(shí)鐘電路。 DISRTO 默認(rèn)狀態(tài)下，復(fù)位高電平有效。這個(gè)ALE 使能標(biāo)志位（地址為 8EH 的 SFR 的第 0 位）的設(shè)置對微控制器處于外部執(zhí)行模式下無效。 XTAL2:振蕩器反相放大器的輸出端。 。它們的值一直到下一個(gè)周期被電路捕捉下來。 定時(shí)器 2可以被寄存器 T2CON中的 TF2和 EXF2的 或 邏輯觸發(fā)。對于 89C52，如果EA 接 VCC，程序讀寫先從內(nèi)部存儲器（地址為 0000H～ 1FFFH）開始，接著從外部尋址，尋址地址為： 2020H~FFFFH。為使能從 0000H 到 FFFFH的外部程序存儲器讀取指令， EA 必須接 GND。然而，特別強(qiáng)調(diào)，在每次訪問外部數(shù)據(jù)存儲器時(shí)， ALE 脈沖將會跳過。 ST: 復(fù)位輸入。 主要性能 ① 與 MCS51 單片機(jī)產(chǎn)品兼容 ② 8K 字節(jié)在系統(tǒng)可編程 Flash存儲器 ③ 1000 次擦寫周期 ④ 全靜態(tài)操作： 0Hz～ 33Hz ⑤ 三級加密程序存儲器 ⑥ 32 個(gè)可編程 I/O 口線 ⑦ 三個(gè) 16 位定時(shí)器 /計(jì)數(shù)器 ⑧ 八個(gè)中斷源 ⑨ 全雙工 UART 串行通道 ⑩ 低功耗空閑和掉電模式 ? 掉電后中斷可喚醒 ? 看門狗定 時(shí)器 ? 雙數(shù)據(jù)指針 ? 掉電標(biāo)識符 功能特性描述 AT89C52 是一種低功耗、高性能 CMOS8 位微控制器，具有 8K 在系統(tǒng)可編程 Flash 存儲器。現(xiàn)有常見的室內(nèi)全彩方案的比較： 1．點(diǎn)陣模塊方案： 最早的設(shè)計(jì)方案，由室內(nèi)偽彩點(diǎn)陣屏發(fā)展而來 。室外屏：Φ 10mm、Φ 12m