An LCD having switchable viewing angles comprises a display panel and a light source. The display panel comprises a first and a second substrates and a liquid crystal layer disposed between the first and the second substrates, wherein the liquid crystal layer comprises a phase retardation having a predetermined range of value more than wavelength of light produced form the light source so that the LCD displays at least a bright state and at least two dark states, or displays at least two bright states and at least a dark state. Therefore, the LCD provides switchable viewing angles.