High Definition usually refers to 720 or more lines of video format resolution displayed in a horizontal fashion from top to bottom. A common native resolution used in HD Ready LCD TV panels is 1366×768 pixels instead of the ATSC Standard 1280×720 pixels. This is due to maximization of manufacturing yield and the fact that 768 pixels are part of standard computer display resolution of 1024 by 768 pixels (XGA), which is compatible with every modern personal computer. Hence, LCD manufacturers adopt the 16:9 ratio compatible for the HD Ready 1080p video standard, but provide native, non-distorted XGA resolution..

Nevertheless, every HDTV has an overscan processing chipset to fix resolution scaling and color rendering, eg LG XD Engine, SONY BRAVIA Engine. Only when viewing 1080i/1080p HD contents under HD Ready 1080p where there is true pixel-for-pixel reproduction, and for HD ready LCD TV, do some signals undergo a scaling process which results in a 3-5% loss of picture.

It should be noted that the numbers used for HD-Ready image resolutions do not constitute acceptable 750- or 1125-line video signals in most standards-compliant hardware; in this respect terms such as 720p and 1080p are mostly used for advertising, though that does not necessarily mean that HD-Ready TVs labeled in this manner are incapable of accepting those formats as input.Additionally, the clean aperture numbers are almost always contained within the frames of their respective production aperture numbers (e.g., a 1888×1062 rectangle would be contained within a 1920×1080 frame).

This is to maintain compatibility with analog signals, which can often become distorted close to the edge of the frame. It also increases the chance that a digital signal being played on overscan-enabled equipment will display the entire picture visibly

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