The display is finished by adding color filters for a color display. The color will be a combination of the three colors: red, green and blue with different intensities. Another glass substrate will be added for stability. At the end is a polarizer with a polarization plane perpendicular on the first one. Due to the fact that the crystal liquid changes the polarization plane, the light can pass thorugh the last polarizer. However, when an electric field is applied, the cells will tend to alineate parallel with the electric field and the liquid crystall will lose its properties. Therefore, light will not pass anymore.