Liquid crystal display panel, image displaying method and image displaying system

An image displaying system, comprising:

• a liquid crystal display panel, wherein the liquid crystal display panel comprises a plurality of three-pixel display units, each of the plurality of three-pixel display units comprises a first red sub-pixel unit, a first green sub-pixel unit and a first blue sub-pixel unit, and the liquid crystal display panel further is demarcated to form a plurality of four-pixel display units, each of the plurality of four-pixel display units comprises four of the three-pixel display units, and the four three-pixel display units are a second red sub-pixel unit, a second green sub-pixel unit, a second blue sub-pixel unit, and a fourth sub-pixel unit, respectively;
• a data signal receiving unit, configured for receiving three-pixel data signals of an image including a red pixel data signal, a green pixel data signal and a blue pixel data signal;
• and
• a data signal processing unit, coupled to the data signal receiving unit and configured for simulating four-pixel data signals of the image according to the three-pixel data signals of the image including generating gray scales of a red pixel data signal, a green pixel data signal and a blue pixel data signal according to luminance and chrominance of the red pixel data signal, the green pixel data signal and the blue pixel data signal and thereby calculating a gray scale of a fourth pixel data signal, wherein the gray scale of the fourth pixel data signal X(gray)=a×R(gray)+b×G(gray)+c×B(gray), where R(gray), G(gray) and B(gray) respectively represent the gray scales of the red pixel data signal, the green pixel data signal and the blue pixel data signal, and a, b, c are constant;
• wherein the liquid crystal display panel is coupled to the data signal processing unit and configured for displaying the image according to the gray scales of the red pixel data signal, the green pixel data signal, the blue pixel data signal and the fourth pixel data signal.