DLP4710AFQL datasheet(31/43 Pages) TI1

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DLP4710

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DLPS125 – NOVEMBER 2018

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8.2.1 Design Requirements

A pico-projector is created by using a DLP chip set comprised of a DLP4710 DMD, two DLPC3439 or DLPC3479

controllers and a DLPA3000/DLPA3005 PMIC/LED driver. The DLPC3439 or DLPC3479 controllers do the digital

image processing, the DLPA3000/DLPA3005 provides the needed analog functions for the projector, and the

DLP4710 DMD is the display device for producing the projected image.

In addition to the three DLP chips in the chip set, other chips are needed. At a minimum a Flash part is needed

to store the software and firmware to control each DLPC3439 or DLPC3479 controller.

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 DLPC3439 or DLPC3479 controllers to the multimedia front end for receiving images, a 24-bit

parallel interface is used. An I2C interface should be connected to the multimedia front end for sending

commands to one of the DLPC3439 or DLPC3479 controllers for configuring the DLPC3439 or DLPC3479

controller for different features.

8.2.2 Detailed Design Procedure

For connecting the two DLPC3439 or DLPC3479 controllers, the DLPA3000/DLPA3005, and the DLP4710 DMD,

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. Layout

guidelines should be followed 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.

8.2.3 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 as shown in Figure 21. For the LED currents shown, it’s assumed

that the same current amplitude is applied to the red, green, and blue LEDs.

SPACE

Figure 21. Luminance vs Current

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