Whats difference between HD-READY and FULL-HD

Whats difference between HD-READY and FULL-HD LCD TV

My assumptions:

Scenario 1 - I dont need a Full HD and can do with a HD READY + a good AV receiver (which upscales the video)

Scenario 2 - I buy a FULL HD TV which i can directly hook up to HD player / Bluray player / DVD player and it still gives me full resolution

I have one more question in addition to the questions raised by prasad. Can an HD Ready TV actually display images at resolutions of 1920 x 1080p which have been upscaled via a DVD player or AV receiver?

I am asking this since HD Ready TV's are specified to have a resolution of 1366 x 768. Also which is a better option, going for a DVD player with HD upscaling or an AV receiver with HD upscaling?

A Full HD is a screen that has a native resolution of 1920x1080 pixles. This can accept and play images that have been scaled up to 1080 with progressive scanning. This is what is known as 1080p upscaling.

A HD Ready screen on the other hand has a native resolution of 1366x768 pixels and can display images with upto 720p resolutions. Though it will also accept a 1080p image, this will be down scaled to match the screen's parameters.

As has been mentioned elsewhere many times, a Full HD system will make sense only if you have a screen size of 42 inches or more. Less than that, a HD Ready system is more that ample.

Cheers

Thanks Venkat but i have one more query.

So will the AV Receiver upscaling (to 1080p) feature be effective with the HD-READY (less than 42")

well in these images u can notice the difference of 720p and 1080p image on a sony 32inch FHD lcd KLV-32W400A .

Attached Images

	720p.jpg (26.0 KB, 176 views)
	1080p.jpg (27.7 KB, 172 views)

Thanks a Ton - Adder

If you do not have a TV or screen that has a native resolution of 1920x1080, you cannot display 1080p images on it even if the AVR does 1080p up scaling.

When you have a AVR that does 1080p up scaling and only a HR Ready TV, you have to set the AVR to upscale only up to 720p. If you set it for 1080i or 1080p upscaling, nothing may happen, excepting that some parts of the movie may get distorted as the TV screen will not be able to handle the incoming data. The TV will try to scale down the images to it's native resolution. If the AVR is sending data at 1080p and the TV is looking at displaying at 720p, there may be a conflict. It is best to ensure that the AVr and the TV are both talking at 720p.

Regarding the choice between the AVR or DVD player to be the upscaling engine, this can only be answered against specific models. For example the Onkyo 875 uses a Reon upscaling engine, one the best in the world. The Oppo 983 Advanced video processing featuring "VRS™ by Anchor Bay" Technologies through two different processing chips.

In the case of the Onkyo, a decent DVD Player would do and you can route both the video and the sound through the AVR.

If you are using the Oppo 983, you can connect the DVD Player to the TV directly, and use the AVR just for sound processing. In this case, a simpler AVR that has decent sound processing engine would suffice.

Today most DVD Players and most AVRs (other than entry level ones) provide video upscaling, So you have to make your choice carefully looking carefully at the video processing capabilities of each unit.

Hi,

According to me 32 in LCDs are out with Full HD logo.So do you think they

are not actual Full HD?

One more thing,do we always need DVD player with upscaling feature to
1080p to get HD image or ordinary DVD player(not blueray) with HDMI out
when connected to Full HD will automaticaly show it?

Spirovious, any TV that has a native resolution of 1920x1080 pixles and can accept and play images that have been scaled up to 1080 with progressive scanning is a Full HD TV.

To fully understand the implications of high resolution and high definition vs size, we must first understand something called acuity of vision. The Dictionary of Visual Science defines visual acuity as "acuteness or clearness of vision, especially form vision, which is dependent on the sharpness of the retinal focus within the eye, the sensitivity of the nervous elements, and the interpretative faculty of the brain." What this means is our eyes have a resolution limit. Increased image resolution is simply an technical exercise, beyond our ability to see it, and does not play any part in improving the viewing experience. Our visual acuity is unambiguous and relatively simple to measure.

The most common vision measuring tool is called the Snellen chart. An optometrist will ask you to read from a chart standing 20 feet (or six meters) away from it. The smallets number you can read defines your acuity of vision. This is expressed as a fraction. A normal vision is supposed to be 20/20. 20/10 means that a subject can read, from a distance of twenty feet, the line that a subject with "normal" vision could only read from ten feet. 20/10 vision is therefore twice as good as 20/20. In comparison, 20/40 is twice as bad.

Coming to video display, the human eye’s resolution (acuity) is directly proportional to the size of the elements of the image and inversely proportional to distance from the elements. This relationship is best expressed in degrees.

In simple terms, we can see things that exist within a known angle with the apex being our nose. If you stare straight ahead, you will have a stereoscopic field of view of about 100 degrees, or about 50 degress to the left and right of your nose. We also have a lower limit to our field of view. Scientists express this as an angle as well, but it is less than a degree, and is expressed differently, For angles smaller than 1 degree we use arcminutes and arcseconds as a measurement. An arcminute is equal to one sixtieth (1/60) of one degree. "Normal" visual acuity is considered to be the ability to recognize an optotype (letter on the Snellen chart) when it goes down to 5 minutes of arc. Taking this to displays, the average person cannot see more than two pixels separated by less than 2 arcminutes of angle.

A 42 inch screen is the minimum size, where the pixels are seperated by 2 arcminutes of angle, if you sit some 6 feet away from it. In smaller screens, the pixels are closer. Though they can also display images with 1080p resolutions, the eye will not be able to appreciate that as compared to say 720p even if you sit very near the screen. Both will look the same.

To get 1080p on the screen you have to upscale data from a regular DVD media. This is called a Standard Definition DVD (SD DVD), by the way. The upscaling can be done by either the DVD player or the AVR. If you have an ordinary DVD player and have a AVR that upscales, it will accept the image through it's component video (or HDMI in some cases) and upscale to 1080p. If you have a DVD player that upscales, and an AVR that does not, you can connect that directly to the TV with a separate connection to the AVR for sound.

What if both have upscaling features? Here you have two options.

(1) Most AVRs have a feature called pass-through. In other words, the AVR will transfer the upscaled vidoe images from the DVD player directly to the TV without any processing.You should use HDMI in this case.
(2) You can connect the DVD player to the AVR with a component video cable and allow the AVR to do the upscaling. The AVR will be connected to the TV through an HDMI.

It is in this situation that you have to switch between the upscaling capabilities of the AVR and DVD player to see which you like and use that method.