| 摘要 |
PROBLEM TO BE SOLVED: To improve the safety in a projection video display apparatus. SOLUTION: A first detection unit 150a and a second detection unit 150b detect the light that is incident from the direction where a screen is to be located. A control section 180 determines whether the screen is located at a recommended position based on output signals from the first detection unit 150a and the second detection unit 150b. When the screen is located at the recommended position, the control section controls the projection display apparatus to be in the state where a significant image can be projected. The control section 180 may determine whether the screen is located at the recommended position and in a normal state based on the output signals. When the screen is located at the recommended position in a normal state, the control section may control the projection display apparatus to be in the state where a significant image can be projected. COPYRIGHT: (C)2011,JPO&INPIT |
