Home > Help Center

Basic Knowledge

TopWhat are the differences between CCD and CMOS?

CCD (charge-coupled device) and CMOS (complimentary metal-oxide semiconductor) are image sensors that convert light into electrons. The sensors are the devices that capture pictures. The differences between CCD and CMOS are shown in the following table:

Mechanism A digital signal processor is required to change the signal from an analog to a digital value. Digital signals can be transmitted with a digital signal processor.
Quality Low-noise images Better quality
More pixels
More susceptible to noise
Lower quality
Lower resolution
Power Consumption More Less
Size Larger Smaller
Len Focus Flexible Limited range


The infrared lighting tool using LED technology is used for supplementing night-time performance of video surveillance cameras. The product can automatically turn itself on/off by self-detecting darkness to preserve energy. It is ideal for infrared enhancement of dark areas in restaurants, night-clubs, warehouses, and wherever video surveillance requires night-time performance. (Some surveillance cameras cannot capture pictures amid darkness.)

INFRARED ILLUMINATOR: It is infrared lighting tool.

INFRARED:It is a detector that shows images clearly even at night.

AUTO: This product automatically detects darkness to preserve energy. In other words, it does not operate amid the brightness.

LED: LED stands for light-emitting diode: a device which produces a light

48 LEDs: This product has 48 leds, as you see from our photo

TopWhat is LCD?

LCD stands for liquid crystal display. It consists of several layers: polarizing filter, sheet of glass, electrode, alignment layer, liquid crystals, alignment layer, electrode, sheet of glass and polarizing filter. Applying an electric current to the crystals will untwist them to varying degrees, subject to the current's voltage. The amount of light passage is controlled by the twist/untwist mechanism.

Unlike CRT monitors, LCD monitors are digital in nature, making possible a direct digital connection to the computer. Because digital-to-analog conversion is not needed, loss of signal is virtually eliminated, resulting in a better image quality.

TopWhat is TFT?

TFT , which is also known as active matrix stands for Thin Film Transistor. In a TFT screen, one transistor is located for each color (RGB) of each pixel. The transistor is to control whether light is allowed to pass from the backlight. Each pixel is made up of three sub-pixels with each having its own transistor.

TopWhat are the differences between TN, STN and TFT?

TN stands for Twisted Nematics, a particular sort of nematic liquid crystal.
STN stands for Super-Twist-Nematic
TFT stands for Thin-Film-Transistor or active matrix displays

Mechanism A particular type of Liquid crystals for display use; In a LCD, TN crystals are twisted 90 degrees from the top piece of glass to the bottom piece of glass. An improved version of TN;
STN are twisted at 270 degrees, instead of 90 degrees.
TFT screen is made up of a grid of pixels, with each pixel having a transistor for each color turning it on or off. The implementation is by controlling the degree of twist
Benefits Low power consumption
Low production cost
Wider viewing angle. Higher colour sensitivity than TN Higher refresh rate
Higher contrast ratio than STN-LCD
Problems Narrow viewing angle
Slow response while applied for high resolution displays
The response speed is still not fast enough for displaying fast moving images (e.g. video) A faulty transistor leads to a defective LCD pixel.
Application Wrist-watches, calculators, pagers, etc Notebooks of early versions Notebooks of latest versions, LCD monitor with wider viewing angles, etc
TopHow do I know which broadcasting/video format is workable in my country? NTSC or PAL or SECAM?

NTSC stands for North American Television Standards Commission. It is a video signal standard used by the color television industry in the United States and Japan.
PAL stands for the Phase Alternating Line. This is a video standard used by the color television industry and is the common standard used in Europe.
SECAM stands for Systeme Electronique Couleur Avec Memoire.
For more details, please find in here.

Broadcast Format Countries Horizontal Lines
NTSC USA, Canada, Japan, Korea, Kexico, Latin America, Taiwan, etc. 525
PAL Belgium, Bosnia, Croatia, Czech, Denmark, Estonia, Finland, Germany, Greece, Hungary, Iceland, Italy, Liechtenstein, Luxembourg, Netherlands, Norway, Montenegro, Poland, Portugal, Ireland, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, etc. 625
SECAM Bulgaria, Estonia, Latvia, Lithuania, Luxembourg, Slovakia, France, Russia, Eastern Europe, Hungary, Iran, Iraq, some African countries, etc. 625


Australia 240
Japan 110
Singapore 220
Taiwan 110
United Kingdom 220-240
United States of America 120
TopA glossary of technical terms
Contrast Ratio The difference between the purest white and the darkest black. It could be 350:1, 400:1, 500:1 and 600:1, etc. A higher ratio means a better image.
Refresh Rate If the refresh rate is 60Hz, the screen will refresh itself 60times per second. If a monitor is refreshing too slow, the image will appear to flicker.
Hz/ Hertz The number of times a monitor can refresh per second. The higher value of Hz means that the screen is less likely to flicker.
Cd/m2 The brightness level of a monitor display is measured in candelas per meter squared. The higher the Cd/m2 is, the brighter the monitor can display.
Resolution The amount of detail can be seen on the screen, measured in terms of pixels. The more pixels the monitor has, the greater detail and the more information can be displayed on the screen at one time. A common resolution is 1024*768.
TopWhat is 1 DIN, 2 DIN, and half DIN?

    DIN refers to a standardized radio/stereo size for vehicles (large enough to accept a CD). 1 DIN is the standard DIN specification. 2 DIN or double DIN refers to units that are twice as high as the standard DIN, half DIN is half high as 1 DIN.
    International standard ISO 7736 defines a standard size for car audio head units. The standard was originally established by the German standards body Deutsches Institut fur Normung, and is therefore commonly referred to as the "DIN car radio size". It was adopted as an international standard in 1984.
    Head units generally come in either single DIN (1 DIN), which is 50 mm high; or double DIN (2 DIN), which is 100 mm high. So please check the player position height of your car carefully, if 50mm, please choose 1 Din Car DVD Player / Monitor, and if 100mm, please choose 2 Din series.

  • pic