An active matrix structure, comprising: a substrate; a plurality of active devices disposed on the substrate; a plurality of pixel electrodes respectively electrically connected to the plurality of active devices and arranged in a delta-arrangement to form a two-dimensional array inside a rectangular-shaped display area with two parallel first sides extending in a first direction (y) and two parallel second sides extending in a second direction (x) orthogonal to said first direction (y), and characterized in that each of the plurality of pixel electrodes has the shape of a concave butterfly-like polygon with slanted sides each inclined in plan view with respect to all sides each inclined of the display area, the slanted sides of each of the pixel electrodes being each parallel to a respective neighboring slanted side of an adjacent pixel electrode, and each slanted side is inclined at a first angle (φ1, (φ2') with respect to the parallel first sides of the display area and at a second angle (φ1', (φ2) with respect to the parallel second sides, and the smaller one of the first and second angles (φ1, (φ2, φ1', φ2') is less than or equal to 10 degrees; and in that a color filter layer is disposed on the plurality of pixel electrodes, the color filter layer comprising plural sets of color filter areas with different colors, wherein each color filter area is associated with a respective one of the plurality of pixel electrodes, and the shape of each color filter area in plan view is a quadrangle which can be considered as being composed of a rectangular first portion and a contiguous second portion that has two parallel straight sides and two parallel identically curved sides, wherein one of the straight sides of the second portion abuts one of the sides of the rectangular first portion, and wherein the two parallel identically curved sides continuously adjoin opposed parallel sides of the rectangular first portion. a substrate; a plurality of active devices disposed on the substrate; a plurality of pixel electrodes respectively electrically connected to the plurality of active devices and arranged in a delta-arrangement to form a two-dimensional array inside a rectangular-shaped display area with two parallel first sides extending in a first direction (y) and two parallel second sides extending in a second direction (x) orthogonal to said first direction (y), and characterized in that each of the plurality of pixel electrodes has the shape of a concave butterfly-like polygon with slanted sides each inclined in plan view with respect to all sides each inclined of the display area, the slanted sides of each of the pixel electrodes being each parallel to a respective neighboring slanted side of an adjacent pixel electrode, and each slanted side is inclined at a first angle (φ1, (φ2') with respect to the parallel first sides of the display area and at a second angle (φ1', (φ2) with respect to the parallel second sides, and the smaller one of the first and second angles (φ1, (φ2, φ1', φ2') is less than or equal to 10 degrees; and in that a color filter layer is disposed on the plurality of pixel electrodes, the color filter layer comprising plural sets of color filter areas with different colors, wherein each color filter area is associated with a respective one of the plurality of pixel electrodes, and the shape of each color filter area in plan view is a quadrangle which can be considered as being composed of a rectangular first portion and a contiguous second portion that has two parallel straight sides and two parallel identically curved sides, wherein one of the straight sides of the second portion abuts one of the sides of the rectangular first portion, and wherein the two parallel identically curved sides continuously adjoin opposed parallel sides of the rectangular first portion.