JP2013080091A - Projection type image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type image display device configured to increase the success rate of turning on a lamp, to extend the lifetime, and to reduce high-voltage pulse noise.SOLUTION: The projection type image display device includes: a light source lamp 13; a light source lamp lighting control circuit part 14 for controlling turn-on of the light source lamp 13; a projection image forming part 17 for forming a projection image; a cooling part 15 for cooling the light source lamp 13; an operation part 18 for turning on/off the device; a power supply part 10 for supplying power; a sub power supply part 11 having a capacitor and supplying power to each part even when an AC power source is cut off; a control part 12 having a microprocessor and a non-volatile memory to control each part; a light source lamp lighting state detection part; an AC power source connection detection part for detecting whether the AC power source is connected or not; a capacitor voltage detection part for detecting a voltage value of the capacitor in the sub power supply part; and a light source lamp cooling time detection part for detecting cooling time of the light source lamp 13.

Description

  The present invention relates to a projection-type image display device, and more particularly to an increase in light source lamp lighting success probability / lifetime and high-pressure pulse noise reduction by improving a light source lamp lighting flow and a cooling method.

  In a projection display device, a high pressure discharge lamp such as a high pressure mercury lamp is mainly used as a light source lamp (hereinafter referred to as a lamp). In this high pressure discharge lamp, it is necessary to apply a high pressure pulse to the electrodes of the high pressure discharge lamp at the time of start-up to perform dielectric breakdown between the electrodes. However, if the high-pressure discharge lamp is at a certain temperature or higher, even if a high-pressure pulse is applied to the electrodes of the high-pressure discharge lamp, the dielectric breakdown between the electrodes may fail.

  For this reason, in the conventional projection type image display device, when the high pressure discharge lamp is at a certain temperature or more, a high pressure pulse is applied for a long time, and the high pressure discharge lamp is deteriorated and high pressure pulse noise is generated in the projection type display device. There was a problem that the time to do increased.

In view of the above, in Patent Document 1, when the AC power supply is reconnected after the AC power supply is shut off while the lamp is lit, the lamp cooling time during the AC power supply shutoff is counted by the secondary power supply that is activated during the AC power supply shutoff , A means to calculate the lamp temperature based on the lamp cooling time while the AC power is cut off, and to control the lamp cooling time before the lamp is turned on, or a temperature sensor is installed near the lamp and the lamp is not turned on until the lamp reaches the specified temperature Means are disclosed.

Also, in Patent Document 2, if the AC power is cut off while the lamp is lit, it is determined that the process has terminated abnormally, and the fact that the lamp has been terminated abnormally is recorded. Means are disclosed.

JP2003-5287 Japanese Unexamined Patent Publication No. 2006-32111

  However, in Patent Document 1, since the lamp cooling time during AC power supply interruption must be counted while AC power supply is shut off, the load on the subpower supply during AC power supply interruption increases accordingly, and the power of the limited subpower supply is limited. It will tighten capacity. In addition, the cost increases due to the installation of the temperature sensor.

  Further, in Patent Document 2, since there is no means for detecting the lamp temperature, the lamp is cooled for a certain time regardless of the lamp temperature when the lamp is turned on after being abnormally terminated. There is a possibility that.

  Accordingly, an object of the present invention is to reduce the load on the secondary power source at a low cost, and to increase the probability of successful lamp lighting / life and reduce high-pressure pulse noise while minimizing the lamp start time. A projection type image display device is provided.

In order to achieve the above object, a projection-type image display device according to claim 1 comprises:
A light source lamp,
A light source lamp lighting control circuit for controlling lighting of the light source lamp;
A projection image forming unit that forms a projection image using light of a light source lamp;
A cooling unit for cooling the light source lamp;
An operation unit that performs operations such as power ON / OFF of the device,
A power supply unit that converts power from an AC power supply and supplies the converted power to each unit;
A sub-power supply unit that has a capacitor and stores the power supplied from the power supply unit while the AC power supply is connected, and can supply power to each unit even when the AC power supply is shut off,
A control unit having a microprocessor and a non-volatile memory to control each unit;
A light source lamp lighting state detector for detecting a lighting state of the light source lamp;
An AC power connection detector that detects connection and disconnection of AC power;
A capacitor voltage detection unit for detecting the voltage value of the capacitor of the sub power supply unit;
A light source lamp cooling time detection unit for detecting a cooling time of the light source lamp;
It is characterized by having.

  According to invention of Claim 1, the following effects are acquired. If the AC power is cut off when the lamp is lit, the AC power connection detector detects the AC power cut. Information indicating that the apparatus has been terminated abnormally by the control unit is recorded in the nonvolatile memory, and the lamp is cooled by switching the power supply to the cooling unit from the power supply unit to the sub power supply unit. When the AC power supply is connected again and the lamp is turned on from the operation unit, if the control unit records that the previous end state was abnormal end in the non-volatile memory, the remaining capacitor of the sub power source unit remains. The voltage is detected by a capacitor voltage detector. By determining the lamp cooling state based on the remaining voltage of the capacitor and determining the lamp cooling time before the lamp is lit, it is possible to increase the lamp lighting success probability.

  Further, according to the first aspect of the present invention, the following effects can also be obtained. When AC power is shut off during lamp cooling after the lamp is turned off, the AC power connection detector detects the AC power cutoff. The information that the control unit is abnormally terminated by the control unit and the lamp cooling time after the lamp is turned off detected by the lamp cooling time detection unit are recorded in the nonvolatile memory, and the power supply to the cooling unit is transferred from the power supply unit to the sub power supply unit. Switch to cool the lamp. When the AC power supply is connected again and the lamp is turned on from the operation unit, if the control unit records that the previous end state was abnormal end in the non-volatile memory, the remaining capacitor of the sub power source unit remains. The voltage is detected by a capacitor voltage detector. The controller determines the lamp cooling state based on the remaining voltage of the capacitor and the lamp cooling time after the lamp is turned off at the previous end, and determines the lamp cooling time before the lamp is turned on. Increase and reduction of high voltage pulse noise can be made possible.

Projector configuration Control flow when AC power is cut off Control flow from AC power supply connection to lamp lighting

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[Example 1]
FIG. 1 shows a configuration of a projector (projection type image display device) according to an embodiment of the present invention. In FIG. 1, the projector 1 has the following functions. A power supply unit 10 that converts power from an AC power source and supplies the converted power to each unit. A sub-power supply unit 11 that has a capacitor and can store power supplied from the power supply unit 10 while the AC power supply is connected to the capacitor and supply power to each unit even when the AC power supply is shut off. A control unit 12 having a microprocessor and a nonvolatile memory and controlling each unit. Lamp 13 as a light source. A lamp lighting control circuit unit 14 that controls lighting of the lamp 13. A cooling unit 15 for cooling the lamp 13. A lamp lighting state detection unit for detecting the lighting state of the lamp, an AC power source connection detection unit for detecting connection and disconnection of the AC power source, a capacitor voltage detection unit for detecting the voltage value of the capacitor of the sub power source unit 11, and the lamp 13 A detector 16 having a lamp cooling time detector for detecting the cooling time of the lamp; A projection image forming unit 17 that forms a projection image using the light of the lamp. An operation unit 18 that performs operations such as power ON / OFF of the device.

  FIG. 2 shows a control flow when the AC power supply of the projector 1 is shut off, and FIG. 3 shows a control flow from connection of the AC power supply to lamp 13 lighting.

  In FIG. 2, first, at step 101, the control unit 12 detects connection / cutoff of the AC power supply by the AC power supply connection detection unit of the detection unit 16, and when the AC power supply is detected to be cut off, the process proceeds to step.

  In step 102, the control unit 12 proceeds to step 106 if the projector 1 is in the standby state, and proceeds to step 103 if the projector 1 is not in the standby state.

  In step 103, the control unit 12 stores the lamp cooling time after the lamp is turned off detected by the lamp cooling time detection unit of the detection unit 16 in the nonvolatile memory of the control unit 12, and proceeds to step 104. (If AC power is cut off while the lamp 13 is lit, the lamp cooling time after the lamp is extinguished is 0).

  In step 104, the control unit 12 stores a flag indicating that the projector 1 has ended abnormally in the nonvolatile memory of the control unit 12, and proceeds to step 105.

  In step 105, the control unit 12 switches the power supply to the cooling unit 15 from the power supply unit 10 to the sub power supply unit 11, and the cooling unit 15 cools the lamp 13 by the power supply from the sub power supply unit 11 and proceeds to step 106. .

  In step 106, the control unit 12 performs other termination processing of the projector 1.

  As described above, in the control flow of FIG. 2, when the AC power is shut off while the lamp 13 is on or the lamp 13 is cooled, the control unit 12 displays the lamp cooling time after the lamp is turned off and the abnormal end flag. It is characterized by being stored in a non-volatile memory. At this time, the cooling of the lamp 13 while the AC power supply is cut off is performed by power feeding from the sub power supply unit 11.

  Next, in FIG. 3, first in step 201, the control unit 12 continues the operation when the cooling unit 15 is operated by the power supply from the sub power supply unit 11 when the AC power source is connected.

  In step 202, the control unit 12 proceeds to step 203 if the start button of the projector 1 is depressed by the operation unit 18, and proceeds to step 201 if not depressed.

  In step 203, the control unit 12 proceeds to step 204 if the abnormal end flag is stored in its own non-volatile memory, and proceeds to step 206 if not stored.

  In step 204, the control unit 12 detects the residual voltage of the capacitor of the sub power supply unit 11 from the capacitor voltage detection unit of the detection unit 16, and proceeds to step 205.

  In step 205, the control unit 12 switches the lamp based on the lamp cooling time after the lamp is extinguished stored in its non-volatile memory in step 103 of FIG. 2 and the remaining voltage of the capacitor of the sub power supply unit 11 detected in step 204. The cooling state of 13 is judged, the lamp cooling time before the lamp is lit is calculated and set, and the routine proceeds to step 207.

  In step 206, the control unit 12 sets the lamp cooling time before lamp lighting to 0, and proceeds to step 207.

  In step 207, the control unit 12 supplies power from the main power supply unit 10 to the cooling unit 15 and activates the cooling unit 15. Simultaneously with the activation of the cooling unit 15, the count of the lamp cooling time before lighting of the lamp 13 set in steps 205 and 206 is started, and the routine proceeds to step 208.

  In step 208, when the control unit 12 finishes counting the lamp cooling time before lamp lighting set in steps 205 and 206, the control unit 12 proceeds to step 209.

  In step 209, the control unit 12 transmits a lamp lighting signal to the lamp lighting control circuit unit 14 to turn on the lamp 13.

  As described above, the lamp 13 is lit after the lamp 13 is sufficiently cooled by performing the control flow of FIGS. 2 and 3, so that the lamp lighting success probability / lifetime increase and high-pressure pulse noise are reduced. It can be made possible.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

DESCRIPTION OF SYMBOLS 1 Projector 10 Power supply part 11 Sub power supply part 12 Control part 13 Lamp 14 Lamp lighting control circuit part 15 Cooling part 16 Detection part 17 Projection image formation part 18 Operation part

Claims (1)

A light source lamp,
A light source lamp lighting control circuit for controlling lighting of the light source lamp;
A projection image forming unit that forms a projection image using light of a light source lamp;
A cooling unit for cooling the light source lamp;
An operation unit for turning on / off the device,
A power supply unit that converts power from an AC power supply and supplies the converted power to each unit;
A sub-power supply unit that has a capacitor and stores the power supplied from the power supply unit while the AC power supply is connected, and can supply power to each unit even when the AC power supply is shut off,
A control unit having a microprocessor and a non-volatile memory to control each unit;
A light source lamp lighting state detector for detecting a lighting state of the light source lamp;
An AC power connection detector that detects connection and disconnection of AC power;
A capacitor voltage detection unit for detecting the voltage value of the capacitor of the sub power supply unit;
A light source lamp cooling time detection unit for detecting a cooling time of the light source lamp;
A projection-type image display device.