DLPC3421 datasheet(35/63 Pages) TI

35 / 63 page

0.33

0.22

0.18

CAIC Disabled

PTOTAL = 1 W

CAIC Enabled

(1)

PTOTAL = 0.73 W

(1) With CAIC enabled, if red and blue LEDs require less than nominal power for a given input image, the red and blue LED power will

reduce.

Figure 7-8. CAIC Power Reduction Mode (for Constant Brightness)

As CAIC applies a digital gain to each color channel and adjusts the power to each LED, CAIC ensures the

resulting color balance in the final image matches the target color balance for the projector system. Thus, the

effective displayed white point of images is held constant by CAIC from frame to frame.

CAIC can be used to increase the overall image brightness while holding the total power for all LEDs constant,

or CAIC can be used to hold the overall image brightness constant while decreasing LED power. In summary,

CAIC has two primary modes of operation:

• Power reduction mode holds overall image brightness constant while reducing LED power

• Enhanced brightness mode holds overall LED power constant while enhancing image brightness

In power reduction mode, since the R, G, and B channels can be gained up by CAIC inside the DLPC34xx, the

LED power can be reduced for any color channel until the brightness of the color on the screen is unchanged.

Thus, CAIC can achieve an overall LED power reduction while maintaining the same overall image brightness as

if CAIC was not used. Figure 7-8 shows an example of LED power reduction by CAIC for an image where the

red and blue LEDs can consume less power.

In enhanced brightness mode the R, G, and B channels can be gained up by CAIC with LED power generally

being held constant. This results in an enhanced brightness with no power savings.

While there are two primary modes of operation described, the DLPC34xx actually operates within the extremes

of pure power reduction mode and enhanced brightness mode. The user can configure which operating

mode the DLPC34xx will more closely follow by adjusting the CAIC gain setting as described in the software

programmer's guide.

In addition to the above functionality, CAIC also can be used as a tool with which FOFO (full-on full-off) contrast

on a projection system can be improved. While operating in power reduction mode, the DLPC34xx reduces

LED power as the intensity of the image content for each color channel decreases. This will result in the LEDs

operating at nominal settings with full-on content (a white screen) and reducing power output until the dimmest

possible content (a black screen) is reached. In this latter case, the LEDs will be operating at minimum power

output capacity and thus producing the minimum possible amount of off-state light. This optimization provided

by CAIC will thereby improve FOFO contrast ratio. The given contrast ratio will further increase as nominal LED

current (full-on state) is increased.

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DLPC3421

DLPS231 – OCTOBER 2021

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