【 Weak current College 】 3LCOS competition two projection 3LCD technology quanjiemi 】

The core of the product as a projector, its chip basic determines the quality and characteristics of projector, projector market expansion, 3 piece of architecture to greater advantages accounted for major market base, this will also be projector chip future technology directions. Due to the high end price 3DLP inaccessible, so there will be a 3LCD and 3LCOS 3 chip structure on the battlefield.

First, 3LCD

Three-plece model LCD (3LCD) takes shape very small high penetration type high-temperature polysilicon (HTPS High-TemperaturePolySilicon;) LCD display panel, each piece is very HTPS multiple pixels, such as the resolution of 1024 × 768 HTPS is 1024 × 768 pixels up to correspond with the projected image pixel. Each pixel contains a signal line, control line, TFT and opening area. Which opening area contains the specific arrangement of liquid crystal molecules, depending on the liquid crystal molecules are arranged in different voltages, changes in the way of change through vibration direction of the light pixels, and the combination with polarizing plate from black to white state transition of different gray levels.

Each 3LCD optical system consists of 3 blocks HTPS. The light sources emit light through A Prism separations out red light, then through the separations mirror B is divided into the Green, and blue light, three colors of light projected onto three respectively corresponding to the LCD Panel, and after the middle of the Prism will be after mixing primary colors of light projected images with different colors.

3LCD technology for imaging and color reproduction is characterized by both the color space of the fully mixed, then shadows in different colors of the image, also known as hybrid restore at the space.
3LCOS structure

LCoS structure is in the silicon chip using semiconductor technology production driven panels (also called CMOS-LCD), and Silicon slice through the grinding mill plain and plating on aluminium(Al) as the mirror substrate, forming a CMOS, CMOS substrate and coated with transparent electrode on glass substrate adhesion, and injection of liquid crystal and packaging.

LCOS chips from the bottom up in the first layer is the IC chip on silicon, adoption of complementary gold oxide semiconductor (ComplementaryMetal-OxideSemiconductor; CMOS) process. In the above for polishing CMOS aluminum coating, used to provide electrode and an interface to shoot the light. Aluminium metal layer coating liquid crystal molecules on to and use of grid framework into pixels. LCOS chip top layer is transparent ITO electrode and the glass substrate layer. LCOS chip structure, adopt modern CMOS fabrication process of IC driver layer is the block-on-chip control hub.

From the pixel structure, LCOS chip CMOS active on the back of the display driver matrix for each pixel offers including switch (NMOS transistor), storage capacitor and Oper aluminum reflection electrode. Work, NMOS transistor control column data cables for LCD pixels and storage capacitor charging, the battery charge in established relative to control electrode voltage difference. So at the top of the liquid crystal molecular orientation in accordance with the voltage and the strength to control access to the deflection of light, forming a grayscale image.

LCOS chip typical pixel section as shown, with four layers of metal for scanning lines, data lines, light layer and the aluminium reflector surface electrodes, a layer of liquid crystal layer, a layer of ITO electrode and a layer of glass substrate.
Three-plece model of LCOS imaging system, the first projector light bulbs emit white light, UV systems systems into red-green-blue color of the light, and then, each of the primary colors of light irradiation to a reflective LCOS chip, system by controlling the LCOS panel liquid crystal State to change the block chips each pixel point reflection light intensity, finally after LCOS reflective lightthrough the necessary optical refraction into a beam of light that passes through the lens of the projector to the screen exposure, color of the image.

This imaging system in the light of light in imaging of utilization on-chip imaging system can be achieved by a times. At the same time, therefore, the same light source and power consumption can produce more bright final screen. At the same time, avoiding the time series single-chip DLP imaging defects, three-chip LCOS projection system can also produce more saturated, full color, and there will not be troubled by single-chip DLP imaging system of Rainbow picture problem.
External lead wire less, connect, simple and convenient machine Assembly

Ordinary LCD has a large number of intensive external lead wire, such as a 1024 × 768 pixel dot matrix LCD with 2592 bar external lead wire, machine Assembly brought inconvenience, but due to the LCD LCoS system in monocrystalline silicon slice LCD rows, columns, pinouts are passed within the semiconductor technology in the silicon chip are connected with the IC, so stay outside of only a few data control line, timing and power cables, etc. You can use the generic connection port and the front-stage circuit, quite simple.

Smaller, more delicate appearance

Ordinary LCD in the manufacturing process required in glass substrate on lithography, made of pixels. Usually made of pixels to be difficult, 0.28mm because in each pixel on the need for an active devices. But the PIX are LCoS system in monocrystalline silicon adopts LSIC on that process, you will like the system to 4 μ m. Therefore, in a few inches of the zero point only silicon chip can be made into 1024 × 768 pixels or 1920 × 1240 PIX dot matrix density of display products.

Low-cost potential

Display of information density increases, and the volume is reduced (0.35 ~ 0.5), natural materials and costs will be significantly lower than the same resolution of the LCD and digital micromirror (DMD) is much lower, will overcome the weaknesses of the finished product rate low, the trust will alsoGreater price space.

High resolution, high brightness

LCOS projection technology's greatest features is its Panel of substrate using silicon wafer CMOS substrate, because of the substrate material is silicon, have a good electronic mobile rate, and the formation of Silicon can be smaller of line, and therefore easier to produce a high resolution of the Panel. A reflective LCOS technology, does not like LCD optical engine because the light penetration Panel while significantly reducing light utilization, so light utilization may increase to 40%, and airy LCD 3% compared to reduce power consumption, and can produce higher brightness.
Opening rate high pixels
LCoS solves common TFT-LCD pixel opening rate is not high technology challenges. Open rate refers to remove each and every pixel of wiring and transistors (usually black matrix hidden) light through part of area and each pixel of the area as a whole. The higher the open rate, the higher the efficiency of the light through. Ordinary TFT-LCD required in each pixel area set aside an area to make field-effect transistor and capacitance, as ordinary TFT-LCD is in glass substrate on amorphous silicon film, made of amorphous silicon or polysilicon layers making FET, amorphous silicon or polysilicon of low electron mobility, field effect tube, and other active devices are larger, and LCoS uses Mono, its electron mobility more amorphous silicon or polysilicon is much higher, so its size can be made into a very small and therefore the opening rate is very high, up to 96%.

Because of the LCoS transistors and circuits are made from silicon substrate, is located in the reflector, and do not occupy a surface area, so the only pixel gap opening area is consumed only, unlike the transmissive TFT LCD and conductors are consuming open area, so in theory, regardless of the resolution or open rate, LCoS are a transmissive LCD high.

Optical high utilization rate

LCoS can improve the utilization of light. It and LCD projection panels are similar, the main difference is that in the case of LCoS reflective images, so the light utilization of up to 40 percent, and digital light processing (DLP), but only a transmissive LCD 3 ~ 10%. We all know, the LCD is a passive display, rely on your external ambient light to show that ordinary LCD on the front is fitted with a Polaroid, LCD is relying on a polarized light switch on/off to show. Polaroid is depend on the absorption of light to produce polarized, so for LCD light transmission rate is very low, so the display is clear, in behind the desired TFT-LCD fitted with a strong backlight, the backlight is power consumption, thus TFT-LCD micropower features the loss caused.

LCoS rear substrates using silicon substrate, LCoS are mostly made of reflective. Silicon pixels and reflective film coated optics, optical reflecting all, so most of the incident light is able to be exploited. LCoS reflective Imaging light efficiency high, not only saving electricity, meet green demand, but also to the portable IT products provide high-definition screen surface.

No technical barriers

Currently has the core technology of the LCD only Sony and Epson, and LCOS technology is not the existence of such problems, more manufacturers to enter this area contribute to the improvement of the technology, but there is no uniform technical standards are universal obstacles.

The above said is LCOS technology advantages, but it is not a perfect LCOS technology, there are still many technical problems to be overcome, such as: black and white contrast is poor, three chip LCOS optical engine is large.
LCOSLCD projection technology industry characteristics and prospects

LCOS projection technology owners almost DLP technology and all the benefits of LCD technology, while very good overcome their weaknesses. This is also the reason why the product is called LCOS projection industry star in the future. However, LCOS industrialization road is not easy.

As an emerging technology products, the production conditions of LCOS relatively harsh, it requires a special production process, special materials, special techniques and testing technology, even special designs. LCOS chips need highly polished aluminum layer of liquid crystal molecules on a close connection with the materials. This step is to cause the LCOS chip yield low key. Liquid and solid surface combination of precision, meet excellent optical imaging with the precision required, LCOS chip process improvement is the most important aspects. Yield of LCOS projector directly lead to price does not have a good competitive advantage. In particular, and full HD resolution of single-chip DLP DLP product comparison, product prices are lower than many of the LCOS products.

Competition in the industry, LCOS on the biggest advantage is that no similar to LCD and DLP projectors that monopoly situation. DLP projector chips only Texas instruments have the technology, and commissioned production of enterprise is also very limited. LCD technology of chip technology relatively better. By Sony and Epson available two companies. However, to provide chip and light machine Enterprise only Epson. Sony LCD product to use. But in the high-end products Sony already completed the transformation of lcos technology.

This core technology monopoly situation necessarily lead industry development lag. Especially in the LCD industry, enterprises have chip technology and is the main terminal, this bound to create your own customers is their main competitor's prospect. DLP technology from Texas instrument in itself the holder does not produce projector products, this avoids upstream manufacturers and manufacturers of competition, the formation of good industry value chain. The current global market DLP products regardless ofmarket size or quantity exceeds enterprise support LCD products.

And LCOS industry at this point is more advantage. LCOS chip basic use of the semiconductor industry and LCD industries mature oriented to the technology. This allows many companiesYou can skip the core patent threshold to develop their own chip products. To have a product key chain is a competitive strength and create greater business value. By this point, you can become an LCOS most projection in enterprises, in particular, advocating creative manufacturing enterprise favorite technology types.

However, none of the core enterprises to lead the LCOS industry also has its inherent weaknesses. It is a standard not unified, strength scattered. This feature will be able to give competitors leave more opportunities. At the same time, they also present the projector only those LCOS focus on the performance of areas for good market performance. Because the cost advantages of LCOS need scale of manufacturing, but the scale manufacturing must be built on a unified industry standard.

Generally speaking, have been marches of projectors LCOS technology industry, continues to be a young baby. But this child born wit, great talent, the owner is not limited in the future. Especially for projection with domestic industry, if you really want to be bold, LCOS technology would be the most promising starting point.