Toshiba 20VL63 LCD TV
July 17, 2007
Toshiba 20VL63 LCD TV is the newly launched LCD TV by the company TOSHIBA. This firm is a world class firm for the manufacturing of plasma as well as 
LCD TV. They have their own name in the market. This model of LCD TV contains a lot of new technologies. Mainly it won’t give eye irritation even if you watch the TV continuously for a very long time. For this advantage the whole system has been adopted by a new technology.
Toshiba 20VL63 LCD TV has no compact flash card. The contrast ratio of this LCD is 500: 1. The interfaces DVB-C, DVB-S, DVB-T are not attached with the system. The system does not contain DVD player or recorder. The system does not contain EPG (Electronic Programme Guide). The system is not supported with energy saving trust feature. The frequency needed by this system is 50 hertz. The HD Ready option is unavailable with this LCD. The HDMI interface is not aided with the system.
The horizontal resolution of the screen is 640 pixels. Toshiba 20VL63 LCD TV has loud speakers for the audio unit. The memory stick, multimedia card are not available with the system. The total number of SCART sockets in this TV is 2, which is more than sufficient for the integration of your TV with camcorders, game console, etc. The PCMIA interface too is not available in this system. The screen format of this system is 4: 3. The screen size of this LCD is 20 inches.
The vertical resolution of this system is 480. The system does not have the XD card.
Toshiba LCD TV does not have any additional attachments. The system is good at the resolution. The picture quality from this system is just excellent. The audio set used in this system is really amazing. Generally the resolution of the screen is measured in pixels. It is always advisable to have a television set with higher solutions.
LCD screen: Can Image persistence be corrected?
July 16, 2007
Screen burns and Image persistence
LCD screens may sometimes be afflicted by a temporary problem known as image persistence. As the continuous, static image produces so called ‘screen burns’ on a plasma screen, in a similar way, they cause LCD screen to display the previous image or part of it on the background thus producing picture of poor quality.
Difference between screen burns and Image persistence
Screen burns of CRT monitors and plasma TVs are often permanent as the phosphors that produce display become pre-maturely old or damaged by the continuous display of some bright, static image on the screen. Screen burns are not reversible because the phosphors cannot be replaced and this leads to permanent imprint of the image on the screen. This is what is normally called ‘screen burns’.
On the other hand, image persistence or image retention on a LCD screen, though produced similarly, is hardly permanent and reversible if you take some remedial steps. LCDs use liquid crystals that produce images using a backlight source. When the voltage is passed through the crystals, they twist and relax depending on the varying voltage. When you let any image on the screen for longer period, the same voltage continues for same amount of time resulting in crystals to stay in one state. So, when the next image appears on the screen, the colours on the affected area will still have a faint imprint of the previous image.
Why Image persistence occurs on a LCD screen?
Any static images that are displayed for a quite longer time like tool bars, program icons or background images tend to produce image persistence on LCD screens.
Fortunately, image persistence does not produce permanent effect on LCD screen, as it is caused by the state of crystals which tend to change depending on the voltage used. When different images appear on the screen they usually prevent image persistence from occurring. However, if any static image is left for a longer duration to cause image persistence, it produces permanent imprint of image only in rare circumstances.
Preventive measures
Image persistence on LCD screens can be prevented by observing certain methods which are given below:
- If you use LCD screens with your PC for much longer time, you can use appropriate power settings in your PC, so that LCD monitors will be off for a few minutes after prolonged use.
- When you are using your monitor, either make some screen saver to rotate over the screen. Generally some graphic images or some blank screen savers are generally preferred for this purpose.
- If you use any background images on your desktop, it is highly recommended that you change them periodically to prevent image persistence from occurring.
Corrective measures
Image persistence can not only be prevented but also can be rectified using following methods:
- If a image persists on your LCD screen, you may keep your LCD screen unused for hours together. If it still persists, turn it off for a few weeks. Often it enables your LCD screen to correct the problem itself.
- Any graphical image used as screen saver often helps to remove the image persistence if it is kept rotating over the screen for longer periods.
Sharp LC37GD8E LCD TV
July 16, 2007
Sharp LC37GD8E LCD TV is introduced to fulfil the desires of the television viewers. This is launched into the market recently to grab the attention of new 
buyers. It is equipped with the latest technologies and innovations. New innovations are put in to this TV to make it a different product in this current market trend. It is designed with the upcoming technology of LCD.
This Sharp LC37GD8E LCD TV has a screen size of 37 inches. The size of the screen is measured diagonally and it is other wise called wide screen system. The dimensions of this television are 92.6 cm in width, 30.4 cm in depth and 70.5 cm in heights. The total weight of this TV is only 23 kilograms and so it is easy to move or to shift this product from place to other place.
The Sharp LCD TV can produce resolutions up to 1366 x 768 pixels. It has a display format of 720 p. The back light life of this TV is 60000 hours. The image aspect ratio of this television is 16:9. Another remarkable feature of this TV is the progressive scan feature. This TVGA (HD-15), HDMI are the PC interfaces supported. The upcoming technology of TFT active matrix technology is used in the display of this TV. This system can produce 20 watts of power as total audio output. It can produce Virtual Dolby Surround sound effects. The sound system consists of 2 x right/left channel speaker.
This Sharp LC37GD8E LCD TV comes with various interfaces or connectors that include 2 SCART (21 PIN SCART), an HDMI interface, one S-Video input, one VGA input, one composite video/audio input and one headphones (mini-phone stereo 3.5 mm).
The operational power consumption of this Sharp TV is 175 watts. This TV has equipped with internal power supply. It needs only AC 230 voltage required for its functioning. The response time of this TV is only 9 ms and the view angle of this TV is 176 degrees.
This Sharp LC37GD8E LCD TV can capable of tuning 99 channels. This uses a reception system called PAL and SECAM. It has only one tuner. You are provided with an electronic programme guide in the format of Digital EPG. This TV is having the capacity of keeping 500 pages of tele text.
Panasonic TX32LXD60 LCD TV
July 15, 2007
Panasonic is a very remarkable name in the manufacturing of electronic products and over the past few years they have established a very good reputation for themselves in the market. With the introduction of their new Panasonic TX32LXD60 LCD TV this has been proved in an unambiguous way. This new Panasonic LCD TV is the perfect blend of the most contemporary design with the most advanced technology. With unique and great design this new model of Panasonic LCD TV is sure to add a flattering remark for your home.
With an active matrix LCD wide screen of 32 inches that displays the images with great perfection you will love to watch this new LCD TV. This new LCD TV is based on tube technology that delivers perfect, sharp and flicker free images. The new digital Panasonic TX32LXD60 LCD TV is an HDTV compatible television as well as HD Ready television that can receive and display high-resolution signals.
The integrated digital TV tuner of this new Panasonic is worth mentioning as it can receive digital signals and also supports Freeview. This new Panasonic TX32LXD60 LCD TV supports a display resolution of 1366 x 768 pixels and a contrast ratio of 1200:1. This new LCD TV also supports a native aspect ratio of 16:9 and an interpolated aspect ratio of 4:3 and 14:9. Another remarkable feature of this new LCD TV is its viewing angle. This television supports a wide viewing angle with support for 170 degrees.
This device comes integrated with 2 stereo speakers with support for 10 watts each. This television set supports Nicam sound format that deliver mind-blowing music to compliment the brilliant images that are displayed on the flat panel LCD screen.
The additional features supported by the Panasonic TX32LXD60 LCD include the following:
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- Progressive scan
- Zoom
- Frequency is 50 Hz
- Integrated tuner
- NTSC playback
- Teletext
- Picture in picture feature
- Picture and text feature
- Sleep timer
- Parental lock
Supported interfaces
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- Headphone jack
- Phono output
- Scart
- S-video
- HDMI
- Composite interfaces
- Component interfaces
Physical specifications
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- Height: 615 mm
- Width: 791 mm
- Depth: 301 mm
- Weight: 19.5 kg
Progressive scan and LCD screens
July 14, 2007
What is interlaced scan?
Standard Television sets use anyone of the interlaced scan systems - namely NTSC or PAL. Both these systems display analog video signals that are broadcast from TV stations or from some video sources. Although the display using these scanning systems produced acceptable results, they failed to create exact images on a PC or when DVD materials are used. It is because the video images produced by these scan system always had a few limitations in terms of resolution and picture quality. In an interlaced scan system, an image is scanned in an alternate order (1, 3, 5) skipping next line. As a result, the images lack smoothness and details and also become prone to constant flickering. Although certain improvements like ‘line doubling’ have been made in this system to produce images of higher resolution, they also produced some undesirable effects like ‘motion lag’ on the screen. Some of the video processors handle these problems quite efficiently, but the display needed an entirely different scanning system to completely remove flaws of the interlaced images.
What is progressive scan?
On the other hand, progressive scan system scans images in a sequential manner (1, 2, 3 etc), from top to bottom on the screen. This scanning method renders more details and smoothness to the images, especially when some text materials are shown on the screen. Presently, progressive scan is used in DVD, Digital TV and HDTV. Progressive scan is ideal for viewing DVDs and HDTV broadcast so high end PCs and flat panel television sets use this scan system to display images.
Progressive scan with 3:2 pull down and different progressive scans
There are two kinds of progressive scans that are being used. Progressive scan and progressive scan combined with 3:2 pull down. Whether your display device uses 3:2 pull down or not, the images are definitely better in terms of picture quality when compared with interlaced video images. However, the 3:2 pull down offers a film-like image quality and is often preferred if you wish to watch some HDTV sources or HD DVDs. Based on number of lines or pixel rows scanned, there are different progress scans like 480p, 720p, 1080i and 1080p. While a typical digital TV uses 480p (480 lines progressively scanned), the rest of the scans are applied in HDTV broadcast. Thus a HDTV broadcast or DVD will have resolution of 720p or higher. So if you plan to view a DVD or HDTV materials and to get enriched visual experience, you should go for TVs that come with progressive scan inputs.
What you should look for in your LCD TV?
If you want to access progressive scan pictures from DVD or TV broadcast, your TV should have anyone or all of the following connectivity options:
- Digital Video Interface (DVI)
- High Definition Multi-media Interface (HDMI)
- Component video input
Together with these inputs, either your TV or your DVD player should have 3:2 pull down detection, so that you can view progressive scan images with reverse 3:2 pulldown.
