DLPC3433 Datasheet, PDF (41/62 Pages) Texas Instruments – Display Controller

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DLPC3433, DLPC3438
DLPS035B – FEBRUARY 2014 – REVISED JANUARY 2016
Typical Application (continued)
9.2.1 Design Requirements
A Pico projector is created by using a DLP chipset comprised of DLP3010 ( .3 720p) DMD, DLPC343x controller
and DLPA200x/DLPA3000 PMIC/LED driver. The DLPC343x does the digital image processing, the
DLPA200x/DLPA3000 provides the needed analog functions for the projector, and DMD is the display device for
producing the projected image.
In addition to the three DLP chips in the chipset, other chips may be needed. At a minimum a flash part is
needed to store the software and firmware to control the DLPC343x.
The illumination light that is applied to the DMD is typically from red, green, and blue LEDs. These are often
contained in three separate packages, but sometimes more than one color of LED die may be in the same
package to reduce the overall size of the pico-projector.
For connecting the DLPC343x to the host processing for receiving images, parallel interface is used. I²C should
be connected to the host processor for sending commands to the DLPC343x.
The only power supplies needed external to the projector are the battery (SYSPWR) and a regulated 1.8-V
supply.
The entire pico-projector can be turned on and off by using a single signal called PROJ_ON. When PROJ_ON is
high, the projector turns on and begins displaying images. When PROJ_ON is set low, the projector turns off and
draws just microamps of current on SYSPWR. When PROJ_ON is set low, the 1.8V supply can continue to be
left at 1.8 V and used by other non-projector sections of the product. If PROJ_ON is low, the
DLPA200x/DLPA3000 will not draw current on the 1.8-V supply.
9.2.2 Detailed Design Procedure
For connecting together the DLP3010 (.3 720p) DMD, DLPC343x controller and DLPA200x/DLPA3000
PMIC/LED Driver see the reference design schematic. When a circuit board layout is created from this schematic
a very small circuit board is possible. An example small board layout is included in the reference design data
base. Follow the layout guidelines to achieve a reliable projector.
The optical engine that has the LED packages and the DMD mounted to it is typically supplied by an optical
OEM who specializes in designing optics for DLP projectors.
9.2.3 Application Curve
As the LED currents that are driven time-sequentially through the red, green, and blue LEDs are increased, the
brightness of the projector increases. This increase is somewhat non-linear, and the curve for typical white
screen lumens changes with LED currents is shown in Figure 22 when using the DLPA2005. For the LED
currents shown, it is assumed that the same current amplitude is applied to the red, green, and blue LEDs.
SPACE
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