Patent ID: 8653753
Filing Date: 2014-02-18
Classification: H05B,Y02B

Abstract:
1. A projection-type image display apparatus that uses a high pressure discharge lamp, which utilizes a halogen cycle, as a light source by lighting the high pressure discharge lamp at one of a rated power and a power that is lower than the rated power, the projection-type image display apparatus comprising: a processing unit to temporarily execute property improvement processing that improves a lamp property while the high pressure discharge lamp is being lit; a reception unit configured to receive an instruction from a user to execute the property improvement processing; and a control unit configured when the reception unit has received the user instruction, to execute the property improvement processing by instructing the processing unit to execute the property improvement processing, wherein said temporary time is between 5 and 60 minutes, wherein the property improvement processing includes: processing for performing low power lighting of the high pressure discharge lamp by temporarily changing the lighting power of the high pressure discharge lamp to a first value that is lower than the rated power; processing for, after performing the low power lighting, performing high power lighting of the high pressure discharge lamp by temporarily changing the lighting power of the high pressure discharge lamp to a second value that is higher than the lighting power during the low power lighting; and processing for temporarily changing at least one of a lighting frequency and a lighting waveform while performing the low power lighting and the high power lighting, in the low power lighting, temporarily changing the lighting frequency involves changing the lighting frequency of the high pressure discharge lamp to a value that is less than or equal to the lighting frequency being used in rated power lighting, and temporarily changing the lighting waveform involves changing the lighting waveform of the high pressure discharge lamp to a value that is greater than or equal to the lighting waveform being used in the rated power lighting, and in the high power lighting, temporarily changing the lighting frequency involves changing the lighting frequency of the high pressure discharge lamp to a value that is greater than or equal to the changed lighting frequency being used in the low power lighting, and temporarily changing the lighting waveform involves changing the lighting waveform of the high pressure discharge lamp to a value that is less than or equal to the changed lighting waveform being used in the low power lighting.