Method for measuring the liquid crystal efficiency of the liquid crystal layer to the incident light

A method for measuring a liquid crystal efficiency of a liquid crystal layer to an incident light, wherein, the method comprises:

• keeping a lower polarizing plate of the liquid crystal layer unchanged to make an upper polarizing plate and the lower polarizing plate of the liquid crystal layer are in a first state, in which a polarization axis of the upper polarizing plate is parallel to a polarization axis of the lower polarizing plate;
• in the first state, controlling a brightness of a screen of a liquid crystal panel to be 0 gray and measuring a brightness Lvx of a target position of the liquid crystal panel;
• in the first state, controlling the brightness of the screen of the liquid crystal panel to be 255 gray and measuring a brightness Lvy of the target position of the liquid crystal panel;
• according to the brightness Lvx and the brightness Lvy, determining a liquid crystal efficiency A of the liquid crystal layer to the incident light;
• wherein, the liquid crystal efficiency A of the liquid crystal layer to the incident light is:
• A
• =
• {
• 1
• -
• Lvy
• Lvx
• }
• ⁢
• %
• ;
• or, before the step of keeping the lower polarizing plate of the liquid crystal layer unchanged to make the upper polarizing plate and the lower polarizing plate of the liquid crystal in the first state, the method further comprises:
• making the upper polarizer plate and the lower polarizer plate of the liquid crystal layer to be in a second state, in which the polarization axis of the upper polarizing plate is perpendicular to the polarization axis of the lower polarizing plate;
• in the second state, controls the brightness of the screen of the liquid crystal panel to be 0 gray and measures a brightness Lvz of the target position of the liquid crystal panel;
• and
• the step of determining the liquid crystal efficiency A of the liquid crystal layer to the incident light according to the brightness Lvx and the brightness Lvy comprising:
• determining a liquid crystal efficiency B of the liquid crystal layer to the incident light according to the brightness Lvx, the brightness Lvy and the brightness Lvz.