DMD devices are the basis of DLP. A DMD can be simply described as a semiconductor optical switch. The working principle of DMD is to reflect the required light by means of the micro-mirror device, and absorb the unwanted light through the light absorber to realize the projection of the image. The direction of illumination is achieved by controlling the microlens angle by means of static electricity.
Three advantages of DMD chip technology
First, small size
The DMD chip is densely packed with 800,000 to 1 million small mirrors, and each small mirror can be flipped 10 degrees in both positive and negative directions and can be flipped 65,000 times per second. The light source is reflected by these small mirrors onto the screen to form an image directly. Its optical path is also quite simple and smaller.
Second, the imaging is realistic
DMD offers 16.7 million colors and 256-segment gray levels to ensure that the DLP projector's projected motion picture is colorful, natural and realistic. With up to 2048 x 1152 arrays, each DMD can generate approximately 2.3 million mirrors. This DMD has the ability to make true HDTVs.
Third, health and environmental protection
The general three-tube rear projection TV inevitably generates X-ray radiation, but the DLP DMD chip itself uses the principle of digital optical reflection, does not emit X-rays, and can protect the viewer's health.
These advantages can be widely used in the following industries
No screen TV
This is due to TI's DLP technology, which first digitally processes the image signal and then projects it out. The core device of DLP technology is called DMD chip, which is a digital micromirror component. It is a device formed on a standard semiconductor process of CMOS, plus a rotating mechanism that can modulate the reflective surface. DMD is also known as an optical modulator that modulates the direction of light. The digital current of the IC is controlled on and off with the 0 and 1 signals. The DMD lens controls the opening and closing of the light to correspond to different reflection angles.
Laser TV: 4K Ultra HD
For TV, Volkswagen consistently advocates ultra-high definition and large screen, these two can make the viewing effect even more shocking. For example, Hisense's 4K ultra-high definition laser TV has a very clear picture and uses TI's DLP chip DLP660TE. 4K shows that it has to meet the two core factors of the CA standard. First, it must be able to display 8.3 million pixels, which is the most basic requirement of 4K DLP. Second, 8.3 million pixels are displayed on large screens. Pixels are precisely aligned. If there is a slight deviation in the alignment process, the imaging effect will be very poor. In the single-chip DLP, there is no such problem, and the pixel points are one-to-one correspondence, so the single-chip DLP scheme has a very good advantage in 4K.
Desktop display
The computer desktop of the projection display can be directly touched by the user, which is convenient and quick. The author thinks that the only problem is the lack of clarity, professional analysis, "the clarity of the desktop display is affected by several factors: First, the panel resolution, the higher the resolution, the higher the clarity; the second is the performance of the optical lens, because this It is an ultra-short projection optics, so the user may see some blurring of the corners, which is related to the manufacturing process of the lens."
Car head up display
Head-up display has always been a hot spot for automotive applications. What would happen if DLP technology was used? At present, Lincoln's Continental is the first HUD that has integrated DLP front-loading. Next year, Lincoln has a second model called navigator, which will also release models with DLP gauges. Texas Instruments has introduced the DLP3030-Q1 chipset and an accompanying evaluation module (EVM) for on-board head-up display (HUD) systems to help automotive manufacturers and Tier 1 suppliers display high-brightness Dynamic Augmented Reality (AR) content On the windshield, the key information is presented within the driver's line of sight.
Designers can use the DLP3030-Q1 chipset certified by the car to develop an AR HUD system that can project a virtual image distance (VID) of 7.5 meters or more. The unique architecture of DLP technology enables the HUD system to withstand the intense solar load associated with projecting far VIDs (up to 105 degrees Celsius). The combination of enhanced VID and the ability to display images in a wide field of view (FOV) gives designers the flexibility to create AR HUD systems with enhanced depth of field for interactive, non-discrete infotainment and instrument cluster systems.
Spectral detection
Display is naturally the highlight of DLP. In addition to display, more areas can be expanded, such as spectral detection. What is the traditional way of spectral detection? Pure optical way. First determine the spectral characteristics and degree of absorption of a substance, and then light up the specific spectrum, analyze whether it is 50% of the true absorption, to outline the spectrum after it is processed, and then compare it with the standard spectrum. .
If a substance has three spectral curves, followed by a so-called linear array, I use three detection lines to detect the absorption effects of different wavelengths. The problem is that the detection of water is done in an array, the test oil is replaced by another array, and the cost of replacing the array is very expensive. The DLP technology is a digital method that can be scanned in digital programming. Three different spectral scans are scanned once or scanned ten times to improve the signal-to-noise ratio. After the scan, the examiner only needs a single detector. The biggest advantage of digital technology is its repeatability, responsiveness, and digital programming technology are very secure.
Digital exposure is applied to PCB boards, beauty equipment, etc.
In the PCB board process, the application of digital exposure to replace the traditional mask is a big trend. There are two ways: the first is to replace the existing PCB circuit-making process; the second is its digital advantage to optimize high-density and multi-layer PCB circuit board. In addition to PCB boards, there are many applications, such as beauty equipment. In laser ecchymosis and scar removal surgery, it is actually used to irradiate the diseased skin with UV light to kill the fungus. Because the location of the lesion is generally not a regular pattern, it will more or less damage normal skin when it is illuminated.
If you use high-precision DLP-based digital exposure technology, you can clearly outline the lesion area without the risk of damaging normal skin.
Summary: As the core of DLP, DMD chip technology has been popularized in the field of industrial projection, but it has not been widely used in the field of civilian consumption. The reason is nothing but the price, scene and mass production factors. Cognitive promotion, the promotion of enterprises, I believe that like a mobile phone, a projector is not known.
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