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The standard display rates are 60Hz for North America and 50Hz for Europe. No broadcast material is delivered at 120Hz nor at 100Hz in Europe. There are no plans to move to higher frame rates.
120Hz (100Hz in Europe) is offered as a "flicker free" technology in some high end televisions. The television takes the incoming signal and adds intermediate frames to double the number of frames each second.
Whether or not the process offers a better picture is a matter of opinion. Some say that it actually reduces image quality and others will say it improves it. Adding frames will not actually add more information to the image because no interpolation system can add detail that has not been captured by the original cameras. If the view prefers a frame doubled image, that is good enough reason to use it.
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What is better a 1080p 120hz or a 1080p 240hz?
1080p 240hz is the better choice, the numbers 120hz and 240hz are the speeds in which the picture refreshs itself. Which means 240hz is going refresh 240 times per second which is twice as fast as the 120hz models.
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Generally, a 120Hz display will not blur images of any content. However, all incoming video signals are 60 Hz, whether from cable, terrestrial or disc. The 120Hz display is generated by taking the 60Hz signal and adding a new image between each of the incoming frames or fields. The process takes a great deal of computing power to work out what the intermediate image would be like if it had been captured by the camera. The process is known as temporal interpolation and has been around for 30 years or more. Even though the technology has been with us for 3 decades, it is still not an exact science and there can be occasions when the incoming signal can fool the processor. When it happens, there may be a visible judder in the image or small details in the picture may be lost completely. In almost all models of television, the 120Hz feature can be turned off if the content is not helped by the frame doubling circuitry. As a final note, 60 and 120Hz are the frequencies used in North America. Europe uses 50Hz so a frame doubling model in Europe will be advertised as a 100Hz display.
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