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Optoelectronics/Displays  

Benefits of dynamic backlighting for small LCD

Posted: 26 Nov 2012     Print Version  Bookmark and Share

Keywords:Backlit liquid crystal displays  contrast ratio  Dynamic backlighting 

Backlit liquid crystal displays (LCDs) are found in many consumer products ranging from tiny mobile phones to large televisions. However, there are often many complaints about the contrast ratio, particularly the black level. Since LCDs require a backlight for illumination—the black level, which is the absence of light, doesn't quite look natural. Dynamic backlighting allows the ability to customise the backlight on LCD screens to increase the contrast ratio by varying the backlight intensity. With more handheld devices capable of playing video files, delivering an improved the viewing experience is a key selling point.

The perceived contrast ratio of a cell phone LCD display can be enhanced by using dynamic LED backlighting for enhanced video viewing. This application note describes how to add instantaneous pulse-width modulation (PWM) intensity control to an existing LED driver, using the MAX6948B as an example.

View the PDF document for more information.

Originally published by Maxim Integrated at www.maximintegrated.com as "Dynamic Backlighting Improves Contrast Ratio and Trims Power for Small LCD Panels".





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