Projection display device, lighting device and temperature measuring method thereof

Abstract

This invention relates to a project device and illumination device and its temperature detecting method, wherein its method comprises the following steps: first, providing an illumination device with one invisible light filter pad to reflect the first light beam back to the illumination device generated by the illumination beam; then, setting at most two heat sensing detecting elements in the illumination device, wherein each element is set outside the first beam moving route; final, using each heat sensing detecting element to measure the temperature in the illumination device.

Description

technical field [0001] The invention relates to a projection display device, an illuminating device and a temperature measurement method thereof, in particular to a temperature measurement method capable of making lamp temperature measurement more accurate. Background technique [0002] In an existing projection display device (for example, a projector), in order to make the lighting device (for example, a mercury lamp) within a suitable temperature, it is necessary to measure the temperature of each key point in the lighting device. [0003] At present, in terms of temperature measurement, it is roughly divided into two types: the adhesion of thermal induction detection components (such as thermocouples, thermalcouples) and infrared (IR) measurement. When measuring temperature with thermocouples, it is necessary to measure the adhesion at each key point. If there are too many adhesion measurement points or improper routing, the wires will interfere with the cooling flow fie...

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Problems solved by technology

[0003] At present, in terms of temperature measurement, it is roughly divided into two types: the adhesion of thermal induction detection components (such as thermocouples, thermalcouples) and infrared (IR) measurement. When measuring temperature with thermocouples, it is necessary to measure the adhesion at each key point. If there are too many adhesion measurement points or improper routing, the wires will interfere with the cooling flow field in the lighting device, and the temperature will be overestimated

[0004] Also, refer to Figure 1a , on a projector (such as a digital light processing [DLP] projector), an invisible light reflector 12a (Invisible-LightFilter) will be installed in front of the light source 11 in the lighting device 10a to filter ultraviolet (UV) and infrared ( IR), but when the light passes through the invisible light reflector 12a, it will penetrate and reflect at the same time, so that the reflected light will focus on the lamp post 13 of the lighting device 10 and the vicinity of the light source 11, resulting in a phenomenon that the measured temperature is higher than the actual value

[0005] Furthermore, if Figure 1b As shown in Chinese Patent Application No. 03119907.0 "Projection Display Device with Invisible Light Reflecting Sheet that Can Disperse Heat Energy", the invisible light reflecting sheet 12b is set in such a way that its normal line and the light path have an acute angle, and the reflected light is easy to Focusing on the cathode line 14 of the lighting device 10 also causes the phenomenon that the measured temperature is higher than the actual value

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