Datasheet

Chapter 4

DLPU006C–January 2012–Revised December 2013

Pattern Sequences

This chapter describes the pattern sequences supported by the DLP LightCrafter Module

4.1 Pattern Sequence Background

The DLPC300 device takes as input 16-, 18-, or 24-bit RGB data at up to 60-Hz frame rate. This frame

rate is composed of three colors (red, green, and blue) with each color equally divided in the 60-Hz frame

rate. Thus, each color has a 5.55 ms time slot allocated. Because each color has 5-, 6-, or 8-bit depth,

each color time slot is further divided into bit-planes. A bit-plane is just one-bit representation of all the

pixels in the image. A 24-bit image is decomposed into its bit planes in Figure 4-1.

Figure 4-1. Relationship Between Bit Planes and 24-Bit RGB Images

The length of each bit-plane in the time slot is weighted by the corresponding power of 2 of its binary

representation. This provides a binary pulse-width modulation of the image. For example, a 24-bit RGB

input has three colors with 8-bit depth each. Each color time slot is divided into eight bit-planes, with the

sum of all bit planes in the time slot equal to 256. Figure 4-2 illustrates this partition of bits in a frame.

Figure 4-2. Relationship Between Bit Partition and Time

Therefore, a single video frame is composed of a series of bit planes. Because the DMD mirrors can be

either on or off, an image is created by turning on the mirrors corresponding to the bit set in a bit plane.

With the binary pulse-width modulation, the intensity level of the color is reproduced by controlling the

amount of time the mirror is on. For a 24-bit RGB frame image inputted to the DLPC300, the DLPC300

creates 24 bit planes, stores them on the mDDR, and sends them to the DLP3000 DMD, one bit plane at

a time. Depending on the bit weight of the bit plane, the DLPC300 device controls the time this bit plane is

exposed to light, controlling the intensity of the bit plane. To improve image quality in video frames, the bit

planes, time slots, and color frames are intertwined and interleaved with spatial-temporal algorithms by the

DLPC300 device.

Pattern Sequences DLPU006C–January 2012–Revised December 2013

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