Abstract: A projector that outputs a first image and a second image alternately while performing switching between the first image and the second image, includes: a discharge lamp driving section that supplies, to a discharge lamp, a drive current that drives the discharge lamp; a state detecting section that detects a deteriorating state of the discharge lamp; and a control section that controls the discharge lamp driving section, wherein the control section controls the discharge lamp driving section so that the absolute value of the drive current becomes relatively small in a first period and relatively large in a second period and controls the discharge lamp driving section so that the ratio of the absolute value of the drive current in the second period to the absolute value of the drive current in the first period is increased with the progress of the deteriorating state.

Abstract: A projector includes a discharge lamp, a discharge-lamp driving unit, a control unit, a light modulating element, and a projection optical system. The control unit alternately repeats a high luminance period in which a driving current having a relatively large absolute value is supplied to the discharge lamp and a low luminance period in which the driving current having a relatively small absolute value is supplied to the discharge lamp. The control unit controls the discharge-lamp driving unit according to a driving current waveform formed by the control waveform unit including a direct-current waveform pattern in which the driving current in a first high luminance period, the driving current in a first low luminance period immediately after the first high luminance period, and the driving current in a second high luminance period immediately after the first low luminance period have the same first polarity.

Abstract: A projector adapted to switch between a right-eye image and a left-eye image at predetermined timings to output the right-eye image and the left-eye image alternately, includes: a discharge lamp; a discharge lamp drive section adapted to supply the discharge lamp with a drive current for driving the discharge lamp; and a control section adapted to control the discharge lamp drive section, wherein a period between the switching timings temporally adjacent to each other starts with a first period and ends with a second period, and the control section performs a second period alternating-current control process for controlling the discharge lamp drive section so that an absolute value of the drive current becomes relatively small in the first period, and becomes relatively large in the second period, and an alternating current is supplied to the discharge lamp as the drive current in the second period.

Abstract: A projector adapted to switch between a right-eye image and a left-eye image at predetermined timings to output the right-eye image and the left-eye image alternately, includes: a discharge lamp; a discharge lamp drive section adapted to supply the discharge lamp with a drive current for driving the discharge lamp; and a control section adapted to control the discharge lamp drive section, wherein a period between the switching timings temporally adjacent to each other starts with a first period and ends with a second period, and the control section performs a second period alternating-current control process for controlling the discharge lamp drive section so that an absolute value of the drive current becomes relatively small in the first period, and becomes relatively large in the second period, and an alternating current is supplied to the discharge lamp as the drive current in the second period.

Abstract: In at least one embodiment of the disclosure, a discharge lamp driving device includes a discharge lamp lighting unit configured to supply power to a discharge lamp while alternately switching a polarity of a voltage applied across two electrodes of the discharge lamp. A controller performs a modulation control of the power in accordance with a power ratio characterized by the power supplied in a polarity switching period. The controller starts the modulation control at a predetermined time after the power supplied to the discharge lamp reaches a predetermined power value.

Abstract: A discharge lamp drive device for driving a discharge lamp including a first electrode and a second electrode, include: a power supply unit which supplies alternating power to the discharge lamp by inputting alternating current between the first electrode and the second electrode, wherein the power supply unit includes a power reduction control unit which reduces the alternating power from a first level to a second level lower than the first level, and a duty ratio control unit which steppedly varies duty ratio of the alternating current in a predetermined period at the time of reduction of the alternating power.

Abstract: A projector includes a light source lamp, a lighting control unit adapted to supply a lamp electric power to turn on the light source lamp, a cooling unit adapted to send a cooling fluid to cool the light source lamp, and a start control unit adapted to, from the start of turn-on of the light source lamp until a predetermined period elapses, adjust at least one of the length of the predetermined period and a limited flow rate, which is the flow rate of the cooling fluid per unit time sent from the cooling unit within the predetermined period, on the basis of an operation history of the light source lamp to control the operation of the cooling unit.

Abstract: To prevent biased consumption of electrodes in a discharge lamp and to prevent biased precipitation of the electrode material, a light source is provided. The light source device has a discharge lamp that emits light by discharge between a first electrode and a second electrode; and a driver that supplies alternating current to the first and the second electrodes so as to maintain the discharge, and changes duty ratio of the alternating current in accordance with predetermined pattern. The predetermined pattern includes a plurality of section periods for which the duty ratio maintains mutually different values for a predetermined period.

Abstract: A projector includes a light source lamp, a cooling device adapted to feed a cooling fluid to the light source lamp to thereby cool the light source lamp, a lighting control section adapted to supply the light source lamp with the lamp electric power having either one of a first electric power value and a second electric power value higher than the first electric power value to thereby light the light source lamp, and a cooling control section adapted to control the cooling device, and the cooling control section controls the cooling device so that the cooling fluid at a flow rate lower than a set flow rate set in accordance with the second electric power value is fed to the light source lamp during a predetermined period after the lamp electric power is switched from the first electric power value to the second electric power value.

Abstract: A projector includes a discharge lamp, a discharge lamp driver that supplies the discharge lamp with a current, a voltage detector that detects a drive voltage for driving the discharge lamp, and a controller that controls the discharge lamp driver. The controller carries out a first control process in which the discharge lamp driver is so controlled that an absolute magnitude of the drive current in a first period is smaller than that in a second period and that an AC current is supplied to the discharge lamp in a second period. The first control process includes a first electric power control process in which first average drive electric power is determined based on the voltage detected by the voltage detector and a current is supplied to the discharge lamp in such a way that average drive electric power is set at the first average drive electric power.

Abstract: A projector includes: a discharge lamp; a discharge lamp drive section which supplies an electric power to the discharge lamp; and a control section which controls the discharge lamp drive section, wherein a period interposed between the switching timings which are temporally adjacent to each other starts in a first period and ends in a second period, wherein the control section controls, on the basis of a correlation pattern which indicates the correlation between a first electric power and a second electric power, the discharge lamp drive section to supply the first electric power to the discharge lamp in the first period and to supply the second electric power to the discharge lamp in the second period, and wherein the correlation pattern includes a pattern in which as the second electric power is decreased, the ratio of the first electric power to the second electric power is increased.

Abstract: A control section relatively decreases an absolute value of a current supplied to a discharge lamp in a first period and relatively increases the absolute value in a second period, and in the second period, performs any one of a first control for supplying an alternating current to the discharge lamp, a second control for supplying, to the discharge lamp, a current in which a maximum duration of a first polarity is longer than that in the first control, and a third control for supplying, to the discharge lamp, a current in which a maximum duration of a second polarity is longer than that in the first control, and as the state of deterioration proceeds, decreases at least one of the maximum duration of the first polarity in the second control and the maximum duration of the second polarity in the third control.

Abstract: In at least one embodiment of the disclosure, a discharge lamp lighting device comprises a discharge lamp driving section and a control unit. The control unit alternately performs a first DC driving processing and a first AC driving processing in a first portion of the driving current. The control unit alternately performs a second DC driving processing and a second AC driving processing in a second portion of the driving current different from the first portion. The control unit performs the first AC driving processing and the second AC driving processing such that a frequency of a first alternating current and a frequency of a second alternating current have different values.

Abstract: In at least one embodiment of the disclosure, a discharge lamp lighting device comprises a discharge lamp driving section and a control unit. The control unit alternately performs a first DC driving processing and a first AC driving processing in a first section of the driving current. The control unit alternately performs a second DC driving processing and a second AC driving processing in a second section of the driving current different from the first section. The control unit temporally changes a length of at least one of: (i) a period for which the first DC driving processing is performed, and (ii) a period for which the second DC driving processing is performed.

Abstract: To prevent biased consumption of electrodes in a discharge lamp and to prevent biased precipitation of the electrode material, a light source is provided. The light source device has a discharge lamp that emits light by discharge between a first electrode and a second electrode; and a driver that supplies alternating current to the first and the second electrodes so as to maintain the discharge, and changes duty ratio of the alternating current in accordance with predetermined pattern. The predetermined pattern includes a plurality of section periods for which the duty ratio maintains mutually different values for a predetermined period.

Abstract: A projector includes: a discharge lamp; a discharge lamp driving unit that drives the discharge lamp by supplying a driving power to the discharge lamp through supply of a driving current thereto; and a control unit that controls the discharge lamp driving unit based on plural operating modes in which maximum values of the driving power are different from one another, wherein the control unit switches the operating mode through a transition period and controls the discharge lamp driving unit so that an average value of a frequency of the driving current in the former half of the transition period becomes larger than an average value of a frequency of the driving current in the latter half of the transition period.

Abstract: In at least one embodiment of the disclosure, a discharge lamp lighting device comprises a discharge lamp driving section, a state detecting section that detects a deterioration state of an electrode of a discharge lamp, and a control unit. The control unit alternately performs a first DC driving processing and a first AC driving processing in a first section of the driving current. The control unit alternately performs a second DC driving processing and a second AC driving processing in a second section of the driving current different from the first section. According to a progress of the deterioration state of the electrode, the control unit increases a length of at least one of: (i) a period for which the first DC driving processing is performed, and (ii) a period for which the second DC driving processing is performed.

Abstract: In at least one embodiment of the disclosure, a discharge lamp lighting device includes a discharge lamp driving unit that drives a discharge lamp by supplying an AC driving current to the discharge lamp. A memory unit is configured to store driving parameters for the AC driving current. A control unit is configured to control the discharge lamp driving unit based on the driving parameters stored in the memory unit. The driving parameters comprise a range of holding time values, each holding time value representing a time period in which the AC driving current is to be continuously maintained at a same polarity. Upon a predetermined time condition, the control unit selects one of the holding time values based on a predetermined probability and controls the discharge lamp driving unit based on the selected holding time value.

Abstract: A driving device adapted to drive a discharge lamp including first and second electrodes adapted to generate discharge light, a primary reflecting mirror disposed on a side of the second electrode and adapted to reflect the discharge light, a secondary reflecting mirror disposed on a side of the first electrode and adapted to reflect the discharge light. The driving device includes: a deterioration detection section adapted to detect a degree of progression of deterioration in the first and the second electrodes; and a deterioration handling section adapted to increase first anode power energy, which is supplied while the first electrode acts as an anode, in accordance with the degree of progression of the deterioration detected by the deterioration detection section.

Abstract: A light source device includes: a discharge lamp provided with two electrodes; a discharge lamp lighting section adapted to light the discharge lamp by supplying the discharge lamp with electrical power while alternately switching a polarity of one of the electrodes of the discharge lamp with respect to the other of the electrodes; and a time-division color separation section adapted to receive light emitted from the discharge lamp in a lighted state and sequentially emit light beams with colors different from each other, wherein the discharge lamp lighting section switches the polarity in sync with a change in the color of the light beam emitted from the time-division color separation section, and provides, as retentive periods in which a duty ratio, which is a ratio of a positive polarity period with the polarity kept positive to a period of the polarity switching, is retained at a constant value over a predetermined period of time, a first retentive period and a second retentive period different in the dut