LCD Projector
LCD projector key technology is the manufacture of liquid crystal panels. The LCD projector utilizes the photovoltaic effect of the liquid crystal, that is, the alignment of the liquid crystal molecules changes under the action of the electric field, affecting the light transmittance or reflectivity of its liquid crystal cell, which affects its optical properties, generates images having different gray levels and color. .
LCD projector maximum support resolution can reach 1600 × 1200 (UXGA), using time can be extended to 8 hours, with high brightness and high-fidelity image color, easy access to each Video signal. They are small, lightweight, easy to carry. The development of the projector has entered a new era.
Projector brand
LCD projector underlayer - LCD board has only only Sony and EPSON two companies have R & D and production capacity, after years of development, LCD technology is mature . Shanghai LCD technology has been committed to improving performance and reducing processing costs. In terms of improving performance, it is mainly to improve the light efficiency by increasing the opening rate, and also use microscope array techniques to increase the light transmittance of the liquid crystal panel, reducing the pixelation of the display image, making the image more delicate. The LCD projector has reached a considerable level in terms of brightness indicators and image exquisite. In addition to high-end cinema products, LCD products maintain the brightness leading advantages of single-piece DLP products in ordinary applications and low-end high-performance projector products. The manufacturer of LCD projectors is mainly Japanese manufacturers.
Barco projector
Barco is a global leader in designing and developing visual solutions for professional markets. Bar can be active in the world, with its own market sales, customer service institutions and production R & D bases in Europe, North America and Asia Pacific.
Barco projector is high-end products, and general sound projects or families will not be used.
Barco China has six officers in the country, including Hong Kong and Taiwan, and has a research and development and production base in Changping, Beijing.
ZoTV projector
Christie is a leading manufacturer of visual solutions for world-class organizations, providing various applications applicable to commercial, entertainment and industries.
Panasonic Projector
Panasonic Group is a global electronic manufacturer, engaged in the production and sales of various electrical products. In 1978, Chinese national leaders visited the Japanese TV factory.
NEC projector
NEC (Japan Electric Co., Ltd.) was founded in 1899, Headquartered in Tokyo, Japan, is one of the world's top 500 companies
EPSON projector
The EPSON projector has been favored by consumers for so many years.
Performance
Output resolution
refers to the resolution of the image spectroelectric. Or call the physical resolution, the actual resolution, that is, the resolution of the LCD liquid crystal panel. The liquid crystal is divided by a mesh on the LCD liquid crystal plate, and a liquid crystal is a pixel point. Then, when the output resolution is 800 x 600, it is said that 800 pixel points are divided in the horizontal direction of the LCD liquid crystal panel, and 600 pixel points are divided vertically. The higher the physical resolution, the greater the range of the resolution, and the wider the adaptation range of the projector. The value of the liquid crystal projector is typically evaluated by physical resolution.
Maximum input resolution
means that the projector can receive a large resolution than the physical resolution, and the signal is performed by the compression algorithm.
1) Early projectors take the extract algorithm, namely: linear compression technology.
This algorithm has a drop problem.
2) The products of each manufacturer have launched a new algorithm for compressed signals.
LCD liquid crystal plate
Liquid crystal has an active liquid crystal and an inactive liquid crystal. Non-active liquid crystals reflect light, generally used in laptops, film projectors. The active liquid crystal has light transmittance, which is used as a LCD plate for use in the projector. By controlling the system, the brightness, color, contrast, and the like by the LCD can be controlled.
The size of the LCD liquid crystal panel determines the size of the projector. The smaller the LCD, the smaller the optical system of the projector, so that the projector is smaller. It is desirable to achieve high resolution on a small LCD, and maintain high brightness, and the difficulty of its technology is imagined. The conference room is more than 1.32-inch LCD liquid crystal panels, and the portable projector is a 0.9-inch LCD liquid crystal panel. In 2000, there will be a 0.7-inch LCD on SVGA and XGA in 2000.
When evaluating the LCD projector, in addition to the size of the LCD board, it is necessary to see the number of projectors using the LCD board. There is a single liquid crystal plate, the projector of three liquid crystal panels. There are many liquid crystal panels, the number of pixels is large. The pixel is the basic unit of forming an image, the larger the number of pixels, the more delicate the image.
pixel = number of physical resolution X liquid crystal plates
, for example: SVGA model pixel number = (800x600) x3horizontal scan line
is also called a video scan line. Mainly used to evaluate the quality of the video signal. Default refers to NTSC system. Generally, VCD is 220 line, LD is 450 line, DVD is 500 lines. The highest support line of the projector is 700 lines.
Brightness
International standard unit is ANSI LD. The measurement environments are as follows:
1) The distance between the projector and the scene: 2.4 meters
2) The curtain is 60 inch
3) Measurement The brightness of 9 points of the projection screen
4) finds the average of 9 brightness, which is ANSI LD.
Various brands of projectors are different from the same environment due to the difference in the environment, but the actual brightness is different.
Color
Almost all projectors support 24-bit true color. So to evaluate the color of the projector, not only look color, but also to look at the contrast.
7. Contrast
is black and white ratio, that is, from black to white Gradient level. The larger the ratio, the more the gradient level of black to the white, so that the color performance is rich.
Screen size
refers to the size of the picture. To put the required size, you need to place the projector on the distance corresponding to the curtain.
Different from various models, the relationship between picture size and projection distance is different.
Projection distance
refers to the distance between the projector lens and the scene.
uniformity
refers to the ratio of the intermediate brightness and the surrounding brightness. The intermediate is generally defined as 100%.
Lens
f is the transluncy of the lens. The smaller f, the better the light transmittance of the lens.
is the magnification ratio of the lens. 77/55 = 1.4, that is, in a fixed position, the picture can be magnified 1.4 times.
ceiling function
Put the projector inverted the roof.
rear projection function
Place the projector behind the back of the carrier.
Ladder Correction
Some projectors can provide an electronic trapezoidal correction function that easily corrects the picture trapezoidal deformation due to the projection projection of the ceiling.
Horizontal Scan Frequency
is also called the frequency. The horizontal scanning frequency of the projector has a range. If the horizontal scan frequency of the input signal from the computer exceeds this range, the projector will not be able to play (no Signal).
Vertical Scan Frequency
is also called. If the vertical scan frequency from the input signal from the computer exceeds this range, the projector will not be able to play (no Signal). Within the scope, the projection effect is good when the vertical scan frequency of the computer is set to a high value.
Input interface
refers to the input interface of the computer display signal. The conference room models typically have two interfaces, which can connect two computers at the same time, and the portable machine is usually only one interface.
Computer Output Interface
refers to the output interface of the computer display signal. Connect the display by this interface. If the projector does not interface, you want to connect the display, you can use the VGA distributor to be implemented.
Video signal
can support three types for video signals: NTSC, PAL, Secam
standard video input
has standard video Input Interface (RCA). The standard video signal is encoded when the output is output, and the signal is compressed, and the decoding is also decoded when receiving. This will lose some signals.
s video input
has an S video input interface (s video). Since the S video signal does not need to be encoded, decoded, there is no signal loss, so the S video signal is better than the standard video signal quality.
Audio input Output
has an audio input output interface. The audio signals such as a computer, a recorder, etc. can be input to play with a speaker. It is also possible to connect the power amplifier, and the external speaker can also be connected.
Power Power
The smaller the power supply, the heat generated by the machine is small, so that the machine continuous projection time is long. In order to use safety, the projector is generally equipped with an overheat protection device.