What to do with DLP projection products, we use this article to tell you

DLP stands for Digital Light Processing, Chinese means digital optical processing technology, and DLP core is DMD chip. The DMD chip is a data micromirror device that achieves the purpose of displaying a projected image by controlling the deflection of the light by the microlens. DLP technology is different from what we call big screen, flat panel display and LCD liquid crystal display. It is a front projection (also called front projection) system, which is mainly used in micro projection products on the market today, mainly involving 3D stereo projectors. , mobile HD video products, portable LED micro projection applications (such as handheld, pocket) and so on. According to the internal structure of the product, DLP projectors can be divided into single-chip DLP projectors, two-chip DLP projectors and three-chip DLP projectors.

DLP technology is a light projection display technology independently developed by Texas Instruments (TI) developed by Dr. Larry Hornbeck of Texas Instruments. In the early years, DMD chips were mainly used in ticket printing machines. Until 1993, this DMD-based optical system was named DLP.

DMD chip works:

DMD chip internal structure diagram

Micromirror

In DMD chips, micromirrors are the smallest unit of work and the key to their performance. Micromirrors are very small in size, but still have a complex mechanical structure different from liquid crystals - each micromirror has a separate support frame and is deflected by +/- 12° around the hinged oblique axis. For micro-mirrors such as micro-mirrors, traditional mechanical or hydraulic control is no longer available (even if it can be used, it can be quickly damaged by mechanical wear), so two electrodes are placed at the two corners of the micro-mirror, and the voltage is passed. Control control deflection for high precision control and unlimited polarization lifetime.

DMD is deflected by +/-12° on each side of the DMD

Micro-mirror working diagram

The micro-mirror works by reflecting light, and its deflection capability is the key. As shown in the above figure, this is a working diagram of a micro-mirror with a deflection angle of +/- 12°. When the micro-mirror is on (On State, +12°), the incident angle of the incident light (light source) reaches 12°, and the reflection angle is also 12° (the sum of the two is 24°). At this time, the maximum light energy is (255, 255, 255); When the micromirror is off (Off State, -12°), the light received by the lens becomes smaller and smaller. When it reaches the off state, the brightness is the lowest, which is (0, 0, 0).

DMD micro mirror works

Texas Instruments DLP Pico projection technology solution:

As the owner of DLP technology, Texas Instruments introduced DMD chips and corresponding video processing chips for the projection market, called DLP Pico display technology, a series of DLP products. Texas Instruments does not manufacture DLP projectors, only DLP Pico chipsets, including two devices: digital micromirror devices (DMDs) and display controllers. Some chipsets also include PMIC/LED drivers. For different DLP micro-projection technology applications, Texas Instruments has introduced mobile portable devices such as smartphones and tablets, Pico projectors for HD/Full HD, wearable devices such as helmets, headphones and glasses, smart home displays, digital signage, A variety of DLP Pico chipset integrated solutions such as mobile smart TV.

Texas Instruments' DLP product line for mobile portable products

Texas Instruments' DLP product line for pico projectors

Texas Instruments' DLP product line for wearable devices

In response to the problem of low color saturation and low brightness of DLP projectors, Texas Instruments also introduced the "extreme color" technology, which uses DDR chips instead of SDR chipset changes to achieve enhanced image color processing. To put it simply, the ultimate color technology is a color wheel that combines three primary colors and three complementary colors, and an appropriate color matching algorithm circuit to achieve the purpose of improving the color display capability of a single-chip DLP projector. In response to the concept of Texas Instruments, the DLR projector manufacturers have different color color wheel designs according to different situations, so the imaging quality will have a big difference.

At present, for the mainstream display technology in the projection market, there are DLP projectors using conventional LCD liquid crystal display projectors, micro-projection technology, and 3LCD projection technology which is said to have good effects in color saturation and contrast. Most non-Japanese projector brands use DLP projection technology, and DLP projectors in Japanese brands including Mitsubishi Electric, Hitachi, Sharp and other brands also occupy a more important position.

Let's take a look at some of the common DLP brands in the projector market and their integrated DLP technology advantages. Introduce targeted DLP series development tools (Texas DLP LightCrafter evaluation module) and DLP finished product integration solutions.

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