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參數(shù)資料
| 型號： | GM2121 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | SXGA LCD Monitor Controller with Integrated Analog Interface and Dual LVDS Transmitter |
| 中文描述： | SXGA液晶顯示器控制器集成模擬接口和雙路LVDS發(fā)送器 |
| 文件頁數(shù)： | 45/51頁 |
| 文件大?。?/td> | 489K |
| 代理商： | GM2121 |
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gm2121 Preliminary Data Sheet
4.17.2 Pulse Width Modulation (PWM) Back Light Control
C2121-DAT-01F
45
December 2002
http://www.genesis-microchip.com
Many of today’s LCD back light inverters require both a PWM input and variable DC voltage to
minimize flickering (due to the interference between panel timing and inverter’s AC timing), and adjust
brightness. Most LCD monitor manufactures currently use a microcontroller to provide these control
signals. To minimize the burden on the external microcontroller, the gm2121 generates these signals
directly.
There are three pins available for controlling the LCD back light, PWM0 (GPIO0), PWM1 (GPIO1) and
PWM2 (GPIO2). The duty cycle of these signals is programmable. They may be connected to an external
RC integrator to generate a variable DC voltage for a LCD back light inverter. Panel HSYNC is used as
the clock for a counter generating this output signal.
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