Why overscan hdtv

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Mount an ISO image in Windows. Boot Into Safe Mode. PC monitors made this clear with "X inches viewable" in their spec sheet, which is just the area reserved for overscan. It also maintains compatibility with SDTVs through converter boxes. Don't forget how many old people are still running those.

It's not like you're bumping p down to p Finally finally, all you have to do to get rid of overscan is change your TV's input type to PC. That automatically gets rid of any scaling issues, and gives you max resolution. Last edited: Jun 8, Luke M Limp Gawd. Joined Apr 20, Messages It's a cheat to make the TV seem bigger.

Joined Nov 16, Messages 2, Stayed at a hotel for two weeks for work. Used the TV as a monitor. Everyday when I got back to the room overscan was magically back on. Joined Jun 3, Messages 9, Click to expand Logan M Limp Gawd. Joined Nov 25, Messages My relatively new 4k TCL still has it.

I have to go in and adjust every resolution using it as a monitor with the Nvidia control panel to have the UI on everything fit properly. Its not that hard but just "Why? SvenBent 2[H]4U. Joined Sep 13, Messages 3, The other 40 lines was a vertical blanking interval to allow time at the end of each frame we're simplifying here, as each frame consisted of two fields for the electron gun to realign from the bottom of the screen to the top.

This took about 2. If all this seems like an awful lot of wasted signal, you should remember that these standards were developed to cope with the relatively wide tolerances involved in mass production in the s. Later, some of these empty scan lines were employed for other purposes: two of them were encoded with data that formed teletext, for example.

Once again, a sync signal was included in this empty space, but the electron guns in CRTs could drift and lose the ability to deflect the electron beam widely. A common-enough sight twenty years ago was to see older TVs with black bars at the top and bottom of the screen as the vertical height of the picture gradually narrowed. These days, with bitmapped digital displays, we are used to perfect picture geometry. The obvious solution to these problems — raggedy left and right edges to the picture, and possible black bars at the top and bottom — was overscanning.

This pushed the ugliness off the actual viewable part of the screen, giving a full picture and nice crisp edges. This process is shown in the two Norman Gunston frames on this page. The first was taken directly from a DVD, but which actually originated as an analogue TV picture in the s. You will see that there are black bars to the left and right and a narrower one at the top.

In addition, at the picture reaches all the way to the bottom on the left hand side, falls one scan line short in the middle area, and two scan lines short at the right side. Clean edges were the result, at the cost of the loss of generally unimportant stuff at the edges. Instead of transmitting a wavering continuous analogue line representing a sequence of analogue scan lines, TV transmissions and DVD and Blu-ray video are handled as a series of frames constituted by a bitmap of pixels.

These are encoded by a compression algorithm — then in the case of digital TV, sent over that wavering broadcast signal — but then reconstituted into their original picture frame format. There are no scan lines as such any more. If the TV station or movie maker wants crisp clean edges to the picture then all they have to do is make sure that the picture entirely fills the frame.