摘要：LED點陣電子顯示屏制作簡單，安裝方便，被廣泛應用于各種公共場合，但是這種電子顯示屏只能做單一的“顯示”作用，顯示內容的更改、擦除等功能的實現都要在上位機上實現。能否用LED點陣顯示屏實現“書寫”功能，本課題基于這一想法，設計并制作一個基于32×32點陣LED模塊的書寫顯示屏。能夠應用在更多的場合之上，比如學校教室、各種玩具等等。

　　本課題的主要任務是完成設計并制作一個點陣分辨率不低于32×32的書寫LED顯示屏，在控制器的管理下，可以顯示文字和圖片，要有不同的顯示效果（例如：上、下、左、右移動），可以通過一個光筆在屏上實現點亮、劃亮、擦除和書寫等功能。

　　本文先介紹了書寫LED顯示屏硬件的系統設計方案，再具體從書寫LED顯示屏主要元器件的選型上進行介紹，選用了高性能STC12C5A16AD單片機，提高了系統的控制速度和能力；選用1588BH-16LED點陣，達到了直觀的顯示效果，選用74LS138與三極管8550共同作為點陣的行驅動，74LS595級聯來作為列驅動。接著闡述了書寫LED顯示屏的總體硬件設計的原理和方法，給出了具體的設計過程，并且研究了硬件上的一些常見問題的處理方法。最后通過測試，系統真實、安全、可靠，符合設計要求。但是由于系統的連接線路很繁瑣，導致了在硬件的焊接上顯得很粗糙，還有待改進。如果用PCB板來制作的話，效果會更好。

關鍵詞：32×32LED點陣  單片機  陣列驅動 光筆書寫

ABSTRACT：LED dot matrix display of simple production, convenient installation, is widely used in various public places, but the electronic display screen can only do single "display" function, to achieve change, erase function display contents have to be implemented in computer. Can use the LED dot matrix display to achieve the "writing" function, this paper based on this idea, the design and fabrication of a based on writing display 32 * 32 dot-matrix LED module. Can be used on more occasions, such as school classrooms, toys etc..

This paper mainly completed the design and production of a lattice resolution less than 32 × 32 writing LED display, controller of the management, can display text and pictures, have different display (for example: the upper and lower, left, right movement), may through the system design scheme of a LED display hardware, then concrete from the selection of writing LED display on the main components are introduced, selects high a pen on the screen to achieve light, lit and writing function.

This paper first introduces the writing performance of STC12C5A16AD MCU, and improve the control speed and the ability of the system; use 1588BH-16LED dot matrix, to display intuitive, selects the 74LS138 triode and 8550 as the dot matrix line drive, 74LS595 cascade as a column driver. Then the paper describes the principle and method of general hardware write LED display screen, the design process were given, processing method and studies some common problems on the hardware. Finally through the test, the system meets the design requirements. But because the system is very complicated, resulting in the hardware welding is very rough, yet to be improved.

Keywords: 32 × 32LED dot ;SCM;Array Drive ;Light pen to write