如何防止调光突发引起的闪烁

摘要： DS3881和DS3882 CCFL控制器，用于汽车，工业和航空电子应用背光液晶面板，需要高的调光比。这些CCFL控制器使用模拟灯电流的振幅调制和数字脉冲宽度的脉冲调光技术，以实现高的调光比。然而，数字PWM脉冲调光，可以创建可见闪烁调光在非常低的水平。本应用笔记介绍了如何消除闪烁。

Maxim > App Notes > Automotive Display Drivers

Keywords: CCFL, cold cathode fluorescent lamp, automotive, liquid crystal display, LCD Jan 28, 2009

APPLICATION NOTE 4092
How to Prevent Flicker Caused by Burst Dimming

Abstract: The DS3881 and DS3882 CCFL controllers are used in automotive, industrial, and avionic
applications to backlight LCD panels that require a high dimming ratio. These CCFL controllers use both analog
lamp-current amplitude modulation and digital pulse-width burst-dimming techniques to achieve the high
dimming ratio. The digital PWM burst dimming can, however, create visible flicker at very low dimming levels.
This application note describes how to eliminate the flicker.


Introduction

The DS3881 and DS3882 CCFL controllers use both analog lamp-cur