Lcd Backlighting For Hdtv

Lcd is winning the race to be the dominant display technology for Hdtv. Agreeing to DisplaySearch, in 2007, the shop for Lcd (liquid crystal diode) Tvs was estimated at .4 billion. Lcd Tv shipments rose a stronger than expected 52% year to year in the second quarter of 2008 to nearly 7.5 million units (79.8% of total Hdtv sales).

The Lcd screen on a Lcd Hdtv is a selective light filter. It does not in itself emit light, but selectively filters light passing through the display from the back. Most Hdtvs comprise either a single sheet of luminescent plastic or sidelighting with fluorescent lamps to contribute the backlight. Both techniques are difficult to control.

Many consumers focus on screen resolution when choosing a High Def (Hdtv) system. Is this Hdtv 720p, 1020i, or 1020p? However, when an expert group, the Smpte (Society of motion Pictures and Television Engineers), recently ranked the significance of screen resolution, it ranked fourth. The Smpte ranked inequity ratio, color saturation, color climatic characteristic and grayscale ahead of screen resolution in importance. The Imaging Science Foundation reached a similar conclusion. Backlighting is the key component to revision in inequity ratio and grayscale.

It is prominent that an Lcd law allows for adjustment of the level of backlighting, and preferably, performs this function automatically. This will heighten the inequity of the picture. Also, a reduced backlight level will also sacrifice power consumption and extend lamp life, as the power used and lamp lifetime is directly associated to the backlight level. A lamp with a 50,000 hour lifetime at 6 milliamps may only have a 30,000 hour lifetime if the current is 7 milliamps, just 1 milliamp higher (Example: Sharp Electronics Lcd Display).

Another prominent factor in the selection of backlighting is the observation of "blur". Blur occurs when there is rapid motion in the programming, such as sports. When the picture changes quickly, the pixels can lag in response. Productive backlight engineering can sacrifice this significantly by strobing the backlighting, so that the personel pixels do not remain lit longer than needed. Examples of this technique comprise the Philips "Aptura" and the Samsung "Led motion Plus".

Sidelighting

With sidelighting, the backlight is settled in the back of the Lcd panel, and to each side to originate panel illumination. To make the light more uniform, a light diffuser is settled in the middle of the lamps and the rear of the optical filter module. Most Lcd systems that use sidelighting use cold cathode fluorescents (Ccf) lamps. This technology provides a very enchanting white light. The lifetime of the lamps is normally in the middle of 10,000 to 20,000 hours (6-12 years at a rate of 5 hours of use per day).

The most prominent disadvantage is that the intensity of light cannot be varied locally, and sidelighting can look non-uniform. Some Ccf lamps comprise mercury. This is an ecological disadvantage.

The major drawbacks:

The intensity of light cannot be varied locally. This results in a lower inequity picture. The light can be non-uniform. Some Ccf lamps comprise mercury.
Conventional Backlighting

Most backlighting is performed with a single sheet of electroluminescent plastic. These panels can age (though improvements in this area have reduced this problem). Electroluminescent Panel backlighting uses colored phosphors to originate light. Displays using this technique can be thin and lightweight, and contribute even light distribution.

The major drawbacks:

Limited life of 3,000 to 5,000 hours to half radiance (2-3 years at a rate of 5 hours of use per day). The intensity of light cannot be varied locally.
Led Backlighting

Led backlighting uses a matrix of Leds that can be controlled individually to offer very good control. In this configuration, a large whole of Leds are mounted uniformly behind the display. radiance improvements in Leds have made them more practical for backlighting. Nec pioneered this technique with their monitor, the 2180Wg. Other companies, such as Samsung, have recently introduced versions of this technology. This should push prices down (the Samsung model cost less than 1/3 the price of a comparable Nec monitor).

This law offers local dimming technology and can perform 1,000,000:1 dynamic inequity ratio. True actual black levels (the "Holy Grail" of Lcd) are attainable by shutting off a pixel's light source. This can eliminate the grayish black picture typical of many Lcd Hdtvs. Groups of Leds can be locally controlled to yield more light, increasing the radiance when necessary.

The problem with accepted white Leds is that their spectrum is not ideal for photographic pregnancy because they are basically blue Leds with a yellow phosphor on top. Their color spectrum has two peaks, one at blue and other at yellow. White Leds that are based on a group of red, green and blue Leds are ideal for the Rgb color filters of an Lcd and can result in the most saturated colors. Sony's "Triluminos" Led backlight law is an example of this technique.
Sometimes, these Hdtvs have a row of Leds across the top and bottom of the display. This improves the radiance and color reproduction, and enables approximately faultless uniformity across the display.

Led backlights are much more Productive that alternative techniques. And since the Led backlight waste less energy, less heat is generated, that must be managed with air conditioning. Led backlights offer a long operating lifetime of more than 50,000 hours (more than 25 years of use at a rate of 5 hours a day).

Led backlit systems may not show well in a typical sell environment. Typically, the screens are somewhat reflective in order to perform the high inequity ratio, and subsequently, a brightly lit showroom may not flatter this technology. In a more typical less-lit environment, this problem should not be as noticeable.

Engineering Concerns

The electrical engineering is simpler with Led backlights. Cold cathode fluorescent lamps (Ccf) need high Ac voltages (1,500 Vac) at startup, and operating voltages of 700 Vac or more. When the lamp is new it may take much less voltage to start, but with age the voltage requirements normally increase, complicating a designer's problem. An electroluminescent panel requires a voltage of about 100 Vac @ 400 Hertz.

A power inverter (to originate Vac) is needed for both Ccf and electroluminescent panels to control with a Dc power supply. This is a principal expense, in cost, size, and weight of the system. The best inverter for this application permits the output voltage to automatically growth as the lamps age, extending the beneficial life of the lamps.

Lcd systems with Led backlighting apply low voltage Dc, normally 12 or 24 Vdc. This results in a smaller, simpler, and more trustworthy system. Led backlit systems must be well cooled or their performance can suffer. The Leds originate less heat than Ccf lamps, but the heat is very concentrated. Operating at high temperatures reduces the Led lifetime and shifts their light spectrum, while reducing output luminance.

Oled

A new technology that you will be hearing about in the future is Organic Led (Oled). This technology has a wholly different backlight technology, it doesn't need one. Because of this, they draw much less power. And because there is no backlight, an Oled law has a larger viewing angle than an Led system. An Oled display is much thinner than an Lcd display. The response time for Oled is faster than general Lcd screens. An mean of 8 to 12 milliseconds in response time is general for a Lcd compared to 0.01 milliseconds in response time for an Oled.

Sony introduced an 11" Hdtv at the buyer Electronics Show in Vegas. The new 11" Sony Tv is called the "Xel-1". It's very thin (1/10") and currently sells for 00. Samsung demonstrated a 31" Oled Hdtv with 1080P resolution at a tradeshow in Asia in November. Lg, Toshiba, Matsushita (Panasonic), and others are investing hundreds of millions of dollars, developing this highly promising technology. Toshiba has plans to sell a 30" Oled display in 2009. Samsung has announced they will sell large screen Oled Hdtvs in 2010.

Oled displays have already been used for some time in digital cameras, cell phones and other devices with relatively small panels, because they are very energy efficient, which is very prominent in movable devices.

In theory, Oled displays can be more inexpensively man-made than Lcd or plasma displays, meaning that they should not be as expensive. Remember that the first large Lcd and Plasma displays were much more costly when they were first introduced.

Summary

Lcd Hdtvs and monitors with Led array backlighting are now the coming of selection because they exhibit best image quality while rescue power. The quality to locally control light output is key to achieving high inequity ratios.