Projection display device, control method for projection display device, and control program for projection display device

A control method for a projection display device having:

• a projection display unit that includes a light modulating unit spatially modulating light emitted from a light source on the basis of input image information and projects image light obtained as a result of spatial modulation onto a projection surface of a vehicle to display an image based on the image light;
• a housing that accommodates the projection display unit and has an opening portion through which the image light exits;
• a cover that covers the opening portion;
• and an object removing mechanism that removes an object adhered to a front surface of the cover by scraping the front surface of the cover, the control method comprising:
• a region detecting step of detecting an object adhesion region in which the object is adhered to the cover;
• and
• an object removal control step of controlling an operation of the object removing mechanism that comprises a sweeper, wherein
• in a case where predetermined display content is included in a portion of the image light, the portion being blocked due to the object adhesion region detected in the region detecting step, the object removal control step further comprises activating the object removing mechanism to automatically remove the object adhered to the front surface of the cover by enabling the sweeper to scrape the front surface of the cover, wherein each of a plurality of pieces of display content which is able to be displayed by the projection display unit is set with a degree of importance concerning safety, wherein the degree of importance of a piece of display content corresponds to a value set in relation to safety, and the predetermined display content corresponds to a value set in relation to safety, and the predetermined display content is display content for which the degree of importance is equal to or higher than a threshold, wherein the threshold is a preset value representing a maximum degree of importance.

A non-transitory computer readable recording medium storing a control program for a projection display device having:

• a projection display unit that includes a light modulating unit spatially modulating light emitted from a light source on the basis of input image information and projects image light obtained as a result of spatial modulation onto a projection surface of a vehicle to display an image based on the image light;
• a housing that accommodates the projection display unit and has an opening portion through which the image light exits;
• a cover that covers the opening portion;
• and an object removing mechanism that removes an object adhered to a front surface of the cover by scraping the front surface of the cover, the control program causing a computer to execute a process comprising:
• a region detecting step of detecting an object adhesion region in which the object is adhered to the cover;
• and
• an object removal control step of controlling an operation of the object removing mechanism that comprises a sweeper, wherein
• in a case where predetermined display content is included in a portion of the image light, the portion being blocked due to the object adhesion region detected in the region detecting step, the object removal control step further comprises activating the object removing mechanism to automatically remove the object adhered to the front surface of the cover by enabling the sweeper to scrape the front surface of the cover, wherein each of a plurality of pieces of display content which is able to be displayed by the projection display unit is set with a degree of importance concerning safety, wherein the degree of importance of a piece of display content corresponds to a value set in relation to safety, and the predetermined display content is display content for which the degree of importance is equal to or higher than a threshold, wherein the threshold is a preset value representing a maximum degree of importance.