Active optical rotator and optical system for LCD projector

8:

• An active optical rotator, comprising a first glass substrate (1), a liner frame (2), a liquid crystal cell (3), a second glass substrate (4), and a first connecting wire (5) and a second connecting wire (6);
• wherein at least one light-transmitting window is provided on the liner frame (2);
• the liner frame (2) is interposed between an exit surface of the first glass substrate (1) and an incident surface of the second glass substrate (4), and are mounted by surface, and then the liquid crystal cell (3) is provided in the light-transmitting window;
• a first transparent conductive film (101) is provided on the exit surface of the first glass substrate (1), and a first alignment film (102) is provided on the first transparent conductive film (101);
• the first connecting wire (5) is connected with the first transparent conductive film (101);
• a second transparent conductive film (401) is provided on the incident surface of the second glass substrate (4), and a second alignment film (402) is provided on the second transparent conductive film (401);
• the second connecting wire (6) is connected with the second transparent conductive film (401);
• and
• the first transparent conductive film (101), the first alignment film (102), the liquid crystal cell (3), the second alignment film (402) and the second transparent conductive film (401) are sequentially arranged according to a light traveling direction.

13:

• An optical system for an LCD projector, comprising an LED light source (11), a transflective plate (12), a square cone condenser (13), a collimating lens (14), the active optical rotator (15) as recited in claim 8, a brightness enhancement polarizer (16), an LCD light valve (17), field lens (18), a reflector (19) and projection lens (20);
• wherein a light-transmitting portion (121) that allows light to pass through is provided on the transflective plate (12);
• a size and an area of the light-transmitting portion (121) are greater than or equal to that of a light-emitting surface (1101) of the LEI) light source (11);
• a reflection part (122) that reflects light is provided on the exit surface of the transflective plate (12);
• the light emitting surface (1101) of the LED light source (1) faces the light transmitting portion (121);
• an external dimension of the reflecting portion (122) is greater than or equal to the dimension of the light-passing hole at the incident end of the square cone-shaped condenser (13).