Reducing power consumption is one of the most important tasks for battery-operated portable devices nowadays as small physical size and light weight are the general norm. New portable devices such as mobile phones, PDAs and digital cameras all deploy large, vivid color LCD for better user experience. However, a bigger and brighter display will consume more power as the display backlight is the single largest power consumer in a typical portable device. The LCD module accounts for around 30~50% of the battery drain when the display is ON.

Dynamic Backlight Control (DBC) technique attempts to reduce the backlight power consumption while maintaining the general image fidelity and quality. While there are quite a number of digital signal processing techniques for DBC, Solomon Systech provides a balanced solution between performance and hardware cost, thereby bringing optimal benefit to our customers.

With deployment of Solomon Systech’s DBC solution, the power consumption of the backlight can be reduced by up to 50%. Depending on the original image content and the required image fidelity after processing, power saving varies. In most cases, the power reduction ranges from 10% to 50% for still images and 20% to 60% for moving pictures (video).

Solomon Systech's DBC solution allow user to choose among different settings:

• Conservative Mode reserves image fidelity as its first priority while performing power reduction. In some cases, only 10% power can be saved. The setting is ideal when a user is interacting with a computer interface (e.g. reading an e-mail or searching for a phone number). 

• Aggressive Mode attempts to save power within an acceptable level of image quality degradation in such cases as when a user watches video. Color tone differences may occur in some cases; however, power saving can increase by up to 60%.  

• Normal Mode takes a balanced approach and is ideal for still images. In this setting, image quality and power saving stand between Conservative and Aggressive modes.

Simplified System Block Diagram of DBC Solution

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