laser? lumen? 4K? The concept of laser television that you don't know is here

Laser is a simplest light source

Sunlight and electric light seem to be white, but when you pass it through a prism, you can see the seven colors of red, orange, yellow, green, blue, blue, and purple. This is due to the fact that the various photons emitted by an ordinary light source are different in frequency/wavelength, and the photons contain various colors.

The same photon frequency/wavelength emitted by the laser is the simplest light source for color. This monochromatic characteristic of lasers has been widely used in clinical selective treatment, optical measurement, and spectroscopic techniques.

Laser is a highly directional light source

The divergence angle of the laser beam is very small, and it is almost a parallel light beam. If the laser is irradiated from the earth to the moon, the diameter of the formed light spot is only about 1 km. The light emitted by ordinary light sources is directed in all directions. In order to concentrate ordinary light in a certain direction, people have developed a concentrating device, even the best searchlight currently focused on, such as the light from the Earth, on the moon, Its spot diameter will expand to more than 1,000 kilometers.

From the perspective of geometrical optics, the better the parallelism, the smaller the focal spot size obtained by focusing the beam, the less dispersion aberrations after laser focusing, and the smaller spot size (up to micron level), which can be used to cut cells or molecules. Fine "scalpel".

Laser is a highly concentrated source of energy

The laser's directionality is good, and its energy is highly concentrated in a limited space, which can lead to a rapid increase in local temperature. A strong laser can even generate hundreds of millions of high temperatures.

Due to the high energy of the laser, the steel plate can be easily punched, cut and welded in industrial production. In medicine, retinal retinal detachment and surgery can be performed. In terms of mapping, measurements of the distance between the Earth and the moon and satellite geodetic measurements can be made. In the military field, light weapons that can destroy enemy planes and missiles can be made.

Laser is a very bright light source

The principle of synthetic images of laser televisions is similar to that of televisions. The laser beam "sweeps" from top to bottom and from left to right. Horizontal deflection (row scanning) is achieved by a multi-faceted rotating mirror in the projection head, and vertical deflection (frame scanning) is achieved by a tilting mirror.

The laser light source of the laser television mainly has three kinds of realization methods, including three primary colors pure laser light source, fluorescent pink wheel plus blue laser, LED plus blue laser mixed light source.

Laser TV user experience changes

Highest demand: screen calibration, connecting external devices

Medium demand: play peripheral files, play network videos, product maintenance and cleaning

Minimum requirements: switch convenience, volume image adjustment, installation of APP, etc. UI interface innovation, simple operation, surround sound.

Compared with the traditional projection, the viewing is cumbersome, and it is necessary to lift the curtain, open the projector, find the film source... and the laser television just meets the simple operation that the projection user wishes to enjoy a good audio-visual experience, and the quality is superior to the projection. These home users will be the mainstream customers of laser TV now.

4K laser television

Taking the example of a 4K laser television on the market, the high processing power optical engine was first used, and its processing capability was improved by 300% compared with 2K laser television products, thus achieving a fine control of 8.3 million light beams and achieving an image performance of 8.3 million pixels. Second, 4K laser television needs high-resolution lens design, Hisense 4K lens achieves an optical resolution of 186 beams per millimeter; Third, 4K laser television manufacturing to achieve micron-level material control accuracy and lens mounting accuracy, Hisense The 4K laser cinema TV adopts a high-precision manufacturing process, and the mechanical processing reaches a precision of 10 microns close to the limit value. The lens adjustment accuracy reaches 5 microns, and the error is less than 1/20 of a hairline diameter. DLP 4K projection technology, the optical part of ANSI brightness has reached a level of about 3,000 lumens, higher than the traditional professional projector ANSI brightness (1000 lumens) is even higher, also supports the support of 3D cinema technology, to achieve a 8.3 million pixel image performance, This perfectly combines reflective ultra-short focus and 4K ultra-clear resolution.

Keywords inventory

laser

The English word for laser is "LASER", which stands for "Light Amplification by Stimu Iatad Emission of Radiation" and means "enlarged radiation of stimulated emission." In 1964, according to the famous scientist Mr. Qian Xuesen’s suggestion, China changed “enlarged radiation of stimulated emission” to “laser.” Although laser is "light," it is totally different from ordinary light. It is another major invention since the 20th century after human beings succeeded in atomic energy, computers, and semiconductors.

ANSI lumens

The brightness of the outdoor shade is 1000 lumens, and the sunlight is slightly stronger. Generally between 2,000 and 3,000 lumens, and below the brightness of 3,500 lumens, our eyes feel very comfortable. When the brightness of direct light or reflected light reaches 4000 lumens, the human eye receives light and becomes difficult. People who drive regularly may experience deeper, hot summer days. The speed of high-speed concrete roads is often as high as 6000 lumens, so we will feel dazzling when we drive. Old drivers will often wear sunglasses.

Contrast

In simple terms, the contrast is high, the picture is more layered, the black and white is distinct, and more details can be highlighted. The effect on the picture is very great. For example, on high-contrast images, in snow, you can see a snow fox running in the distance. If the contrast is low, you may only see snow. High-contrast American movies are also extremely cool. You can see the action in night fighting situations. If the contrast is low, you can only watch the shadows and hear the sound.

Laser crystal

A laser crystal is a working substance of a laser, and emits a laser after being pumped, so it is called a laser crystal.

Color gamut

The color of the visible spectrum in the natural world constitutes the largest color space, but for so many colors it requires a more intuitive representation. The CIE International Lighting Association developed a CIE-xy chromaticity diagram for the intuitive performance gamut.

In the CIE-xy chromaticity diagram, the range of color gamuts that can be represented by various real-world devices can be represented by a triangular region consisting of RGB three-point lines. The larger the area of ​​the triangle, the larger the gamut of the display device. . However, this range is too large for display technology. The colors we display through the screen are much smaller than this. So in 1953, the National Television Standards Institute (NTSC) developed the NTSC color gamut standard based on the CIE chromaticity diagram, and planned a 100% gamut space, quantifying the size of the gamut by percentage.

The coverage of the color gamut of early LCD TVs can only reach 40% to 50% of the NTSC standard. After that, the coverage of TV color gamuts continues to increase. At present, even the most mainstream LCD TVs can reach about 72% NTSC coverage. In recent years, with the continuous development of wide color gamut technology and quantum dot technology, the NTSC gamut coverage of television has basically reached more than 90%, and some may even reach about 140%.

There are two types of TVs currently on the market, which are our common liquid crystals and OLEDs. Quantum-dot TVs are essentially LCDs because they do not get rid of backlight control. The OLED's display principle is self-luminous. After being excited by electricity, it can directly display very pure red, green and blue primary colors, so the color gamut coverage can easily achieve a higher level.

At present, OLED TVs have basically added white pixels (WRGB) to reduce the high color purity of RGB OLEDs. Quantum dots are the most ideal materials for improving the color gamut. Its luminescent purity is higher than that of organic molecules and is higher than that of inorganic phosphors. The stability of quantum dots is similar to that of inorganic phosphors, but the processing performance is the same as that of organic molecules. Therefore, quantum dots are quantum. The point can be said to take into account the advantages of organic and inorganic materials. Quantum-dot TVs excite quantum dot crystals on thin films by irradiating a pure blue light source, releasing pure red and pure green light, and projecting the remaining pure blue light onto the imaging system. This provides extremely pure and far-reaching light. LED phosphor lighting principle. . The color gamut coverage of the top TV products under the joint venture brand is basically maintained at between 85% and 95%. Since the end of 2014, high-color televisions have been blessed with new types of backlight technology assisted by quantum dot materials, which has brought the gamut coverage of televisions to a higher standard. In recent years, high-gamut televisions have become televisions. The focus of the manufacturer's publicity. The pump emits laser light, so it is called a laser crystal.

DMD chip

Color wheel single-chip digital micromirror (DMD) chip. DLP is based on the digital micromirror device DMD developed by Texas Instruments Texas Instruments to complete the display of digital visual information. DMD Digital Micromirror Components Digital Micromirror Device The core of the DLP technology system—the digital micromirror chip used in the heart of the optical engine—is formed on a standard CMOS semiconductor device with a rotating mechanism that can adjust the angle of the reflective surface.

A DMD can be simply described as a semiconductor optical switch. Thousands of tiny square lenses are mounted on the deflection structure to form a DMD chip, each lens size is about 16x16um.

Linear Encoder

Draw-wire sensors of the wire sensor series measure with high linearity across the entire measuring range and are used for distance and position measurements of 100mm up to 20,000mm. Draw-wire sensors from LANDER are ideal for integration and subsequent assembly in serial OEM applications, e.g., in medical devices, lifts, conveyors and automotive engineering.

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