DLPA2000 datasheet(32/68 Pages) TI

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7.3.5 Content Adaptive Illumination Control (CAIC)

Content Adaptive Illumination control (CAIC) is part of the IntelliBright® suite of advanced image processing

algorithms that adaptively enhances brightness and reduces power. In common, real-world image content, most

pixels in the images are well below fullscale for the for the R (red), G (green), and B (blue) digital channels input

to the DLPC34xx. As a result of this, the average picture level (APL) for the overall image is also well below full

scale, and the dynamic range for the collective set of pixel values is not fully used. CAIC takes advantage of the

headroom between the source image APL and the top of the available dynamic range of the display system.

CAIC evaluates images on a frame-by-frame basis and derives three unique digital gains, one for each of the R,

G, and B color channel. During image processing, CAIC applies each gain to all pixels in the associated color

channel. The calculated gain is applied to all pixels in that channel so that the pixels as a group collectively shift

upward and as close to full scale as possible. To prevent any image quality degradation, the gains are set at

the point where just a few pixels in each color channel are clipped. The Source Pixels for a Color Channel and

Pixels for a Color Channel After CAIC Processing figures below show an example of the application of CAIC for

one color channel.

APL Headroom

Single-pixel

Headroom

Time

255

110

(1) APL = 110

Figure 7-5. Source Pixels for a Color Channel

Clipped

to 255

Time

255

166

(1) APL = 166

(2) Channel gain = 166/110 = 1.51

Figure 7-6. Pixels for a Color Channel After CAIC

Processing

Above, Figure 7-6 shows the gain that is applied to a color processing channel inside the DLPC34xx.

Additionally, CAIC adjusts the power for the R, G, and B LED by commanding different LED currents. For

each color channel of an individual frame, CAIC intelligently determines the optimal combination of digital gain

and LED power. The user configurable CAIC settings heavily influence the amount of digital gain that is applied

to a color channel and the LED power for that color.

DLPC3436

DLPS156E – JANUARY 2019 – REVISED APRIL 2023

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