DLPC3470 datasheet(44/70 Pages) TI1

44 / 70 page

DLPC3470

DLPS110 – APRIL 2018

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CAIC can alternatively be used to increase the overall brightness of an image while holding the total power for all

LEDs constant. In summary, when CAIC is enabled CAIC can operate in one of two distinct modes:

•

Power Reduction Mode – holds overall image brightness constant while reducing LED power

•

Enhanced Brightness Mode – holds overall LED power constant while enhancing image brightness

Figure 25. CAIC Power Reduction Mode (for Constant Brightness)

8.3.2.7 Local Area Brightness Boost

Local area brightness boost (LABB), is an image processing algorithm that adaptively gains up regions of an

image that are dim relative to the average picture level. Some regions of the image will have significant gain

applied, and some regions will have little or no gain applied. LABB evaluates images frame by frame and derives

the local area gains to be used uniquely for each image. Since many images have a net overall boost in gain

even if some parts of the image get no gain, the overall perceived brightness of the image is boosted.

Figure 26 shows a split screen example of the impact of the LABB algorithm for an image that includes dark

areas.

Figure 26. Boosting Brightness in Local Areas of an Image

LABB works best when the decision about the strength of gains used is determined by ambient light conditions.

For this reason, there is an option to add an ambient light sensor which can be read by the DLPC3470 controller

during each frame. Based on the sensor readings, LABB will apply higher gains for bright rooms to help

overcome any washing out of images. LABB will apply lower gains in dark rooms to prevent over-punching of

images.

DLPC3470 Datasheet(PDF) 44 Page - Texas Instruments