Reflective LCD panel by disposing a white sub-pixel unit in the pixel unit and using the while sub-pixel unit in collaboration with the pixel electrode to increase brightness of the pixel unit

A reflective liquid crystal display (LCD) panel, which comprises:

• an upper substrate and a lower substrate disposed opposite to each other, and a liquid crystal (LC) layer sandwiched between the upper substrate and the lower substrate;
• the upper substrate comprising:
• a first base substrate, and a common electrode disposed on the first base substrate;
• the lower substrate comprising:
• a second base substrate, a thin film transistor (TFT) device layer disposed on the second base substrate, a color filter (CF) layer and a black matrix (BM) disposed on the TFT device layer, and a pixel electrode disposed on the CF layer and the BM;
• wherein the CF layer comprises a plurality of pixel units arranged in an array, each of the plurality of pixel units comprising:
• a red sub-pixel unit, a green sub-pixel unit, a blue sub-pixel unit, and a white sub-pixel unit separated by the BM;
• the red sub-pixel unit reflecting red light and absorbing green light and blue light;
• the green sub-pixel unit reflecting green light and absorbing red light and blue light;
• the blue sub-pixel unit reflecting blue light and absorbing red light and green light;
• wherein the white sub-pixel unit comprises a reflective film and reflects red light, green light, and blue light, and the pixel electrode comprises a transparent electrode that is disposed on the CF layer and the BM, wherein the transparent electrode is directly disposed on red sub-pixel unit, the green sub-pixel unit, the blue sub-pixel unit, and the white sub-pixel unit of the CF layer, and a part of the transparent electrode is stacked directly on the reflective film of the white sub-pixel unit;
• wherein the red sub-pixel unit, the green sub-pixel unit, the blue sub-pixel unit, and the white sub-pixel unit of the pixel unit are arranged in following arrangement:
• the red sub-pixel unit, the green sub-pixel unit, the blue sub-pixel unit, and the white sub-pixel unit being arranged in a column from top to bottom.