Posts Tagged ‘ LCD Monitor ’

LCD Video Camera Monitor

Wednesday, June 22nd, 2011

Most digital video security systems today are designed for use with an LCD video camera monitor.  There are a few reasons for this, but there are also reasons why it may be difficult to use an LCD monitor.  In the following article will discuss LCD monitors how they differ from CRT (Cathode Ray Tube) monitors and some of the advantages of using them instead of a CRT.

First of all, to understand the difference that exists between the two types of monitors let’s briefly discuss how each one works.  The CRT monitor receives an analog radio frequency signal that contains the information for drawing a picture on the front of the CRT or screen.   The CRT shoots horizontal beams of light back and forth from behind the screen very rapidly.  If your camera is a 500 TVL (TeleVision Line) camera and your CRT monitor screen is made up of 500 horizontal lines or more, then you’ll see every bit of the video image that is sent to the CRT in good detail.

In other words, the analog resolution measurement as it pertains to non-digital hardware is the TVL.  The higher the number the TVL the higher the resolution of the picture display.  A 500 TVL display means there are 500 horizontal lines (created by the ray of beams from the CRT).  This obviously will show less detail than say a 380 TVL of the same image.

Remember too that these lines can vary in size from monitor to monitor.  A 19 inch monitor will have much finer (thinner) lines than a 32 inch monitor.

Also, most analog screens have only two types of possible input/output connectors; a 75 ohm cable connector or an RCA plug.  These are a “standard” for analog video connections and are on the backs of most monitors and televisions.

A digital video security camera system Liquid Crystal Display or LCD video camera monitor differs from the CRT type in many ways.  First an LCD monitor is designed for digital input not analog.  This means there are different standards of measurement for the LCD monitor as compared to the CRT.

Another major difference is in the way the LCD video camera monitor displays its images.  Unlike the CRT whose picture consists of horizontal lines, the LCD monitor displays are in pixels.  Pixels are very small dots usually round or square in shape that make up the image and entire LCD screen viewing area.  Like the CRT’s horizontal lines being an indication of resolution or detail, the LCD’s standard for measurement is the pixel.  Keep in mind that pixels vary in size especially from small monitors to large monitors.

However, because these pixels on the average are much smaller than the TVL the LCD video camera monitor automatically makes for a good competitor to the CRT because of the enhanced capability to display a greater resolution or in other words, higher detail.

So the pixel is really the standard of measurement with an LCD video camera monitor.  This can be confusing as well because both resolution and size on an LCD video camera monitor are based on pixel measurements.  For example your monitor may have a screen that is 800 x 600 pixels.  Let’s re-emphasize that the 800 x 600 is the total amount of pixels available for displaying an image.

The image could be 340 x 280 pixels, so what does that tell us?  Basically it tells us the SIZE of the image–on your monitor or anyone else’s, the image will be 340 x 280 pixels.  (Remember that earlier we said pixel size can change with total screen size.)  The actual resolution or detail hasn’t been stated yet but generally speaking, the greatest resolution that can be obtained on an LCD Video Camera Monitor is 96 dpi or dots per inch.

So 96 dpi is actually the resolution.  Any image viewed on the monitor with a resolution greater than 96 would be wasting information.

To summarize then, a CRT monitor’s resolution is displayed as TVL or horizontal lines; the more the TVL the more detailed the picture.  High definition monitors and TV’s display 1080 TVL.  An LCD video camera monitor’s resolution is usually around 96 dots per inch.  The pixel measurement, such as 800 x 600 tells how big the image is but not what the resolution is.

So when shopping for an LCD video camera monitor be sure to keep these things in mind to make sure you get the type/size you need.


Security Camera Monitor

Thursday, March 3rd, 2011

The security camera monitor is probably considered one of the most important components of a digital video security system.  Yet, it is not purchased as often as other components like cameras and Digital Video Recorders (DVRs) and today’s systems can actually run without one.  In fact, Security Camera King takes pride in offering a complete digital video security package that includes the cameras, cables, connectors, power supply, and DVR but no monitor.  Why is that?  Read on to find out why, and to learn some other interesting facts about the security camera monitor.

There are three types of security camera monitors based on how they are used.  The first is a set-up monitor.  This monitor is only used when the system is first installed or any future changes are made to the system.  It may come in a variety of styles and sizes.  Security Camera King offers, for example, our product number VX-WLCDM, a 2.5 inch LCD service monitor with a wrist strap.

Use this monitor to aim cameras, choose settings on the DVR, and check connections.  Once the system is set up or the changes are made, the monitor is usually disconnected from the system.

The second type of security camera monitor is called the “spot monitor.”  A spot monitor is usually a monitor that is connected to just one camera.  It allows the user to specifically monitor full-time that one area of the security system that the specific camera covers.  The monitor maybe located in close vicinity of the camera it is monitoring or may be located in another location, whichever is most appropriate for the user.

If the spot monitor is used on a “cabled” system, there must be a separate cable run to the spot monitor in addition to the DVR.  This is usually accomplished by adding a splitter to the cable at some point to create a feed to the spot monitor and another to the DVR input.

The third type of security camera monitor is the system or main monitor.  This monitor is generally connected to the DVR by one or more cables and displays the on-screen information of the cameras and the DVR.  Usually this monitor is bigger in size than a spot monitor so that it can accommodate the simultaneous displaying of all or groups of cameras in the system at the same time.

Security camera monitors are like televisions (or perhaps more like personal computer monitors) in composition.  There are basically two types of monitors that are used today, but generally there is only one type that is used the most often.  The two types based on composition are the CRT and LCD monitors.

The CRT or Cathode Ray Tube monitor is the oldest type.  As its name implies it consists of a Cathode Ray Tube that produces the picture.  The CRT monitor is bulkier, heavier, and produces a lower resolution picture than the LCD monitor; basically, its equivalent to the older models of televisions that also used a CRT.  These monitors are still used today, but usually in older systems or as spot monitors.

The LCD or Liquid Crystal Display security camera monitor is probably the single most popular monitor type in use today.  It is much lighter than the CRT, it uses less energy, and displays at a much higher resolution and color, capable of providing quality high definition displays.  These monitors were once limited in size, but as technology advances so do the available sizes.  Security Camera King offers monitors as large as 42 inches.

A monitor is required to initially set-up a system.  However, all systems do not necessarily have system monitors.  The reason for is because once the system is set up it can record and function automatically.  More often however, users have personal computer systems or older monitors from computer systems in which the system is outdated but the monitor is still useful.  Then again, many users opt to connect their systems to the Internet and use any computer system’s monitor or even a Smartphone instead.

One last note; if you are considering purchasing a security camera monitor, regardless of the type, make sure the monitor has the proper connection input type available.  Our DVRs have HDMI, VGA, and BNC connections to make connecting the monitor an easy process for you.  However, many monitors, especially those once used for computers, only have a VGA connection for example.  So be certain to make sure your monitors, camera and DVR display types, and connectors match.


Wireless Security Cameras with Computer Monitor

Monday, May 17th, 2010

Wireless security cameras with computer monitor provide excellent security and surveillance for both businesses and residents alike. A wireless security camera system set up with a computer monitor can provide live real-time monitoring of any area, indoors or outdoors in well lit areas or at night.

Wireless security cameras with a computer monitor can be used just about anywhere. A wireless security camera transmits it video images using either the 2.8 or 5.8 KHz frequencies to a receiver that is tuned to the same channel. The receiver then passes the signal on to the processor or a personal computer.

The advantage of using a wireless security camera is that no cabling is required for transmission of data. This has several beneficial implications. First, installation is much simpler and faster. Second, security cameras can be placed in areas that might otherwise be impractical. Third, security cameras can be located in positions that are relatively remote from the processor, digital video recorder or DVR, or personal computer.

Wireless security cameras can be used with personal computers to complete the security system. If this is the case, a computer monitor is ideal for viewing wireless camera transmissions or for playing back recorded data. In this case, the computer becomes the processor and the DVR but a good quality, high resolution monitor is still needed to view the security camera transmissions in real time.

Contemporary computer monitors are typically Liquid Crystal Display or LCD types with very high resolution capabilities. Security system computer monitors usually provide a variety of connection inputs including composite, S-video, component, and personal computer capabilities. Their response times are normally very fast (for example 16ms) which allows for high quality display of multiple video feeds. Computer monitors for security systems often have an amplifier and speakers built right in to the monitor so that audio may be heard as well.

Of all the components of a security/surveillance camera system, the monitor is probably used the most. The greatest advantage to Closed Circuit Television or CCTV cameras is the ability to view the target area in real time; live. For this reason you should choose your wireless security camera system’s monitor carefully. Be certain that it has a high enough resolution display to be able to display all of your cameras’ feeds simultaneously with good clarity and quality.

There are many uses for wireless security cameras with computer monitor. One very popular application for a wireless security camera with computer monitor is in a nursery or baby’s room. These systems allow you to monitor your baby any time day or night by using spot monitors or a central computer monitor.
Another popular application of a wireless security camera system with computer monitor is for monitoring the entering and exit of customers into and out of various business locations. Wireless cameras can easily be installed in lobbies and vestibules where entrance and exit doors are located. Real-time monitoring of every individual that enters and leaves the premises can be accomplished with relative ease.