The green subpixels are mapped to input pixels on a one-to-one basis. The human eye is most sensitive to green, especially for high resolution luminance information. PenTile RGBG layout used in AMOLED and plasma displays uses green pixels interleaved with alternating red and blue pixels. That is, that any given input pixel is mapped to either a red-centered logical pixel, or a green-centered logical pixel. This layout is specifically designed to work with and be dependent upon subpixel rendering that uses only one and a quarter subpixel per pixel, on average, to render an image. As the S cones are primarily responsible for perceiving blue colors, which do not appreciably affect the perception of luminance, reducing the number of blue subpixels with respect to the red and green subpixels in a display does not reduce the image quality. It was inspired by biomimicry of the human retina which has nearly equal numbers of L and M type cone cells, but significantly fewer S cones. The layout consists of a quincunx comprising two red subpixels, two green subpixels, and one central blue subpixel in each unit cell. 'PenTile Matrix' (a neologism from penta-, meaning 'five' in Greek and tile) describes the geometric layout of the prototypical subpixel arrangement developed in the early 1990s.
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