led显示屏亮度和颜色的调整方法（Method for adjusting brightness and color of LED display screen）.docVIP

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led显示屏亮度和颜色的调整方法（Method for adjusting brightness and color of LED display screen）.doc

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led显示屏亮度和颜色的调整方法（Method for adjusting brightness and color of LED display screen）

led显示屏亮度和颜色的调整方法（Method for adjusting brightness and color of LED display screen） Method for adjusting brightness and color of LED display screen The scanning principle, scanning circuit and adjustment method of the dual color LED display screen are introduced. The technical parameters and working state of 74HC595 drive by scanning circuit are analyzed. The technical parameter list of 3 companies is given, and the parameters of 74HC595 are analyzed. Key words: LED display; data communication; display module 1 Introduction At present, the production of dual color LED (LED) display screen is relatively large, and its technology is relatively mature. The structure and principle of the display screen made by each enterprise are basically similar. Some professional production display multimedia cards, therefore, improving the technical performance of the display and reducing the cost is the key to the competition of each enterprise. Now, the LED display on the market price is basically the same, but the quality of the screen production of different, its reason is in many aspects, mainly as follows: LED display quality, brightness, brightness uniformity, module encapsulation technology; communication transmission data, the anti-interference ability; display multiple point adjustment scanning circuit of current, the control current of every point. After a plurality of adjustments, the display screen not only has better uniformity, but also displays the brightness and the color effect of the image better, and the special display scanning circuit has better display effect, but the price is relatively expensive. Now, the LED display on the market is produced by many enterprises using the same design techniques, methods and display modules, but their performance is quite different. The color ratio is different, and the image effect is very different. The scanning frequency, the working current of the module affect the brightness and the service life. Therefore, the correct det