Image display apparatus

1. An image display apparatus, comprising:

a light source section configured to emit light;

an image projection section that includes an emission surface, wherein the image projection section is configured to project an image based on the emitted light from the emission surface; and

a controller comprising:

a calculator configured to calculate a reference distance from the emission surface to a determined position, wherein the reference distance is a distance at which power of the emitted light per unit area at the determined position is equal to or less than a determined value; and

a notification section configured to notify information related to the calculated reference distance, wherein

the light source section is further configured to emit the light at a determined power,

the calculator is further configured to calculate the reference distance in response to a power supply of the image display apparatus turned on,

the controller is configured to determine whether to continue emission of the light from the light source section at the determined power or to switch to emission of the light from the light source section at a power higher than the determined power, and

the switch is after the notification of the information by the notification section.

2. The image display apparatus according to claim 1 , wherein

the calculator is further configured to calculate the reference distance based on a property of the emitted light.

3. The image display apparatus according to claim 1 , wherein

the image projection section is further configured to project the image at a determined projection ratio, and

the calculator is further configured to calculate the reference distance based on the determined projection ratio.

4. The image display apparatus according to claim 1 , further comprising

an operation section configured to receive a user operation,

wherein the calculator is further configured to calculate the reference distance based on the user operation in real time.

5. The image display apparatus according to claim 1 , wherein

the notification section is further configured to:

generate image information including information on an influence of the emitted light; and

control the image projection section to project the image information.

6. The image display apparatus according to claim 1 , wherein

the notification section is further configured to output information on an influence of the emitted light as an audio.

7. The image display apparatus according to claim 1 , further comprising

a storage unit configured to store a first look-up table for associating a property of the emitted light with the reference distance, wherein

the calculator is further configured to calculate the reference distance to based on the first look-up table.

8. The image display apparatus according to claim 7 , wherein

the image projection section is projecting further configured to project the image at a determined projection ratio, and

the storage unit is further configured to store a second look-up table for associating the determined projection ratio with the reference distance.

9. The image display apparatus according to claim 7 , wherein

the image projection section further includes a mounting section on which a plurality of types of projection lens sections are mountable, and

the storage unit is further configured to store a third look-up table corresponding to the plurality of types of projection lens sections.

10. The image display apparatus according to claim 1 , further comprising

an operation section configured to receive a user operation, wherein

the controller is further configured to determine, based on the user operation, whether to continue the emission of the light from the light source section at the determined power or to switch to the emission of the light from the light source section at the power higher than the determined power, and

the switch is after the notification of the information by the notification section.