Picture quality of different pixel arrangements for large‐sized matrix displays

The image information theory is introduced to the study of pixel arrangement for flat displays which has been based mainly on subjective evaluation tests. the objective is to make a theoretical elucidation of the relations between different pixel arrangements-particularly pixel arrangements of light-emissive elements for large-sized matrix displays-and picture quality. First, the factors determining picture quality are identified using a picture model incorporating the sampling of the original picture. As a result, the Nyquist limits are shown to be essential. Second, the Nyquist limits of different pixel arrangements are evaluated. the areas surrounded by the Nyquist limits are shown to consist of colored and discolored regions. This observation is used to relate the Nyquist limits to visual limits and picture quality. Third, the picture quality of typical pixel arrangements for large-sized matrix displays is examined. the quality of still and motion pictures displayed by the RGB-trio and RGGB-mosaic arrangements are compared by means of subjective evaluation tests and three-dimensional spectrum analysis. the comparative analysis gives the following conclusions: (1) In displaying still pictures, the RGGB-mosaic arrangement has the effective number of pixels about twice the real number of pixels because of the overlaps of adjacent pixels, but the RGB-trio does not have this effect. (2) In displaying motion pictures, the RGGB-mosaic arrangement provides better picture quality than in the case of still pictures but the RGB-trio arrangement does not.