Saturday, November 14, 2009

Light Emitting Diode Television (LED TV)

Advanced research and developments in semiconductor electronics is ramping up its applications in every stream of life. Once the TVs looked like big cubical boxes, which was heavy and large in size. Today we talk about thin “Plasma” or “LCD” display screen, which are about 25mm in thickness, also there is a buzz about LED TVs even though they are not released commercially yet all over the world.

The technology incorporated in LED TVs can have revolutionary impact as the power consumption is expected to reduce drastically compared to its predecessors. Actually LED TVs work on same principle as well known LCD display TVs, but in the former LEDs are used to light the screen instead of conventional incandescent source.

There are two different ways to light up screen, it can be lit either from back or from side (Edge). Both these techniques have their own advantages and disadvantages. If the screen is lit from backside then we can get highly effective contrast in pictures with compromise on thickness of screen. Where as if Edge lighting is used then contrast effect may reduce with advantage of thin screen. Also some limitations arise, as cost becomes major consideration in practical applications. The entire screen having around 2million pixel is lit with mesh of just 1000 LEDs in case of Back lighting. With increase in number of LEDs no doubt we get better quality picture but cost also shoots up rapidly not only because of LED count but also due to the complexity involved in control circuit of LED mesh. Theoretically speaking each pixel should have independent LED in which case LCD screen itself may be eliminated and entire picture can be formed using LEDs itself.

Back LED lighting LCDs

In this technology the LED mesh is placed exactly behind the LCD screen as can be seen in the picture, and a group of LEDs is switched ON depending on the picture required. Controlling the lighting of each LED independently is very complicated process. As LEDs are backside leakage of light on dark pixel is very less because of which we get very sharp contrast. In the backlight simulation slide (middle) we can see that the brightness of screen at different parts is varied depending on which LCD displays the picture.

The clarity of the screen also depends on the LED density and controlling ability of circuitry attached. Presently optimum density is maintained in spite of which the cost of this type of TVs is around 25% more than fluorescent lamp lit LCD TVs.

Edge LED TV

Another way of lighting the screen is edge lighting in which the LEDs are placed along the periphery of the screen and intensity and brightness of pixel depends upon the intersection of vertical line LED and horizontal line LED.

 

 

In this type of technology the contrast is not as sharp as previous one due to leakage of light (Light incident on other pixels than intended one) to the adjacent pixels. But at the same time the thickness of screen becomes very thin.

 

Source: http://www.technoveda.net

Posted via web from san09's posterous

LED TV

Advanced research and developments in semiconductor electronics is ramping up its applications in every stream of life. Once the TVs looked like big cubical boxes, which was heavy and large in size. Today we talk about thin “Plasma” or “LCD” display screen, which are about 25mm in thickness, also there is a buzz about LED TVs even though they are not released commercially yet all over the world.
The technology incorporated in LED TVs can have revolutionary impact as the power consumption is expected to reduce drastically compared to its predecessors. Actually LED TVs work on same principle as well known LCD display TVs, but in the former LEDs are used to light the screen instead of conventional incandescent source.
There are two different ways to light up screen, it can be lit either from back or from side (Edge). Both these techniques have their own advantages and disadvantages. If the screen is lit from backside then we can get highly effective contrast in pictures with compromise on thickness...
TO READ FULL VISIT:
http://www.technoveda.net

Thursday, October 1, 2009

Tips & Tricks to run Electronic gadgets without Battery!!!...

The near and dear create fear when you need them most!…

Almost all gadgets we use need uninterrupted energy source either with mains plugged in or with battery backups, but they never move inch without power. And they love to drain out exactly when you need them most, Laptops blinks red when you are middle of the presentation in conference hall or you are sending very important mail, Digicams warns low power the moment you spot beauty to capture, mobile display low battery when you are in the middle of very important / interesting conversation. Under these circumstances some tips and tricks can definitely make one breath longer...

Continue here For TIPS & TRICKS

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Monday, September 21, 2009

Free Software utilities Absolutelly FREE Download...

Hi, Utilities play as important role as OS for everyone who really wants his system to be dynamic. So lot many times people download either validation copy or sometimes pirated versions but having a grnuine softwares give completely new life to your system. You can use genuine utilities as long as you want without any legal threat or any problem.

So dont wait to download FREE utility software

FREE DOWNLOAD

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Wednesday, September 16, 2009

Future with Organic LEDs (OLEDs)

With increasing energy crisis and environmental worries researchers are looking for more efficient methods of lightning the world. The organic LEDs (OLED) take them a step ahead, these OLEDs are expected to be much more efficient than inorganic or normal LEDs with life span of 20years. 

 

OLED are composed of thin layer of organic compounds which can illuminate in a wide range of colors. As OLED is thin layer it is also flexible and..

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Google is Integrating HTML5 standard in mobile browser

The search engine giant Google will soon give an another reason to smile for mobile internet browsers. It is working closely with open source developers for integrating HTML5 technology in mobile browser. Google's PC based web browser 'Chrome' is also actively involved in developing HTML5 standard which aims to provide powerful web applications to web browser without need for proprietary plug ins. The HTML5 is expected to take user experience to completely new level with richer and faster applications on internet.

Google is focusing on mobile application as mobiles market growth in India is considered to be the fastest in the world and also its emerging as major device for people to connect to web. There is also a huge potential

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Saturday, August 15, 2009

Blackberry or iPhone?...

Blackberry is a business device trying hard to appeal and popularize itself, while iPhone appears to be the present generation trinket clamoring for corporate acceptance. Its hard to compare these, as with every other feature one appear to be out shadowing the other. Both exhibit their excellence in some features and falters in some other. Which one to go for completely depends on what their personal lifestyle demands. Here are few points in which Blackberry holds an upper hand over iPhone.
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Is Yahoo-Microsoft deal a real threat to Google?

The speculative journey of Yahoo-Microsoft deal is finally concluded, when two companies announced a partnership in Internet search and advertising to take on industry powerhouse Google. There is lot of skepticism about whether the this partnership can have strong impact on Google's dominance.

Even with the deal it appears very difficult for Yahoo-Microsoft to wean people away from Google's simple white search engine. If they fail to build larger audience base then it will definitely hit the major revenue source through Ads tied with searches.

Last year Microsoft rated 3rd in search market bid $47.5 billion to buy Yahoo, rated 2nd in search market. Finally Microsoft withdrawn the offer, this led to lot of soul searching in Yahoo and replacement of its co-founder.

Under this agreement Microsoft will provide the underlying search technology on Yahoo's popular websites. This deal is expected to boost recently launched Microsoft search engine Bing,
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Friday, August 7, 2009

Will 3G meet consumer expectations?!!

By Sandeep S C, 30th July 08

The ever growing demand for richer and sophisticated applications on mobile cell phone has greatly influenced the exponential growth in wireless communication. Even before the penetration of 2.5G in to the rural market already urbanites are counting days for full fledged 3G network with great expectation.

Many developed countries are already functioning with full stretched wings in 3G. In India government is yet to auction the bandwidth that 3G is demanding. As 3G is having very large bandwidth compared to its predecessors, consumers are expecting much luxurious services from it, such as high speed internet, video conferencing on move, high quality picture, online streaming video & audio etc. Nearly 5% of mobile users have already upgraded themselves with 3G handsets.
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Saturday, August 1, 2009

 
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