RGBG

RGBG refers to a subpixel arrangement used in some display panels, most notably certain PenTile OLED screens. In this scheme, each logical pixel is composed of four subpixels arranged in a repeating 2x2 tile: red, green, green, blue (often described as RGGB). The two green subpixels are the dominant element of the pattern, which helps sustain higher brightness and efficiency.

The RGBG layout is designed to exploit human visual perception, which is more sensitive to green luminance. By allocating more subpixels to green and using fewer red and blue subpixels, manufacturers can achieve similar perceived brightness with lower power consumption and potentially higher effective resolution than a strict one-to-one RGB stripe. This approach can also simplify manufacturing and reduce costs for color filters and pixel circuits.

Advantages of RGBG include increased luminance efficiency and potential energy savings, along with the ability to deliver bright, high-contrast images on compact displays. It can also contribute to thinner, lighter panels and extended battery life in mobile devices.

Disadvantages include potential color accuracy and uniformity challenges, especially at small font sizes or sharp edges, where the nonstandard subpixel pattern can produce visible color fringing or moiré effects unless compensated by specialized rendering and text anti-aliasing techniques. Some users may perceive less crisp text compared with traditional RGB stripes, depending on viewing distance and content. Modern displays often balance these factors with advanced subpixel rendering and calibration.

See also: Bayer RGGB patterns in image sensors refer to a different use of similar letters and are unrelated to display subpixel layouts.