Projection type display apparatus and control method for projection type display apparatus

Patent metadata

Field	Value
Publication number	US-2016105652-A1
Application number	US-201314778542-A
Country	US
Kind code	A1
Filing date	Mar 27, 2013
Priority date	Mar 27, 2013
Publication date	Apr 14, 2016
Grant date	—

Abstract

A color wheel includes a plural of transmission areas (R, G, B, C, W and Y) on which light from a light source is made incident and which each transmit light of a different wavelength. A detector detects ambient information. A power supplier supplies power to the light source. A controller controls the supply power to be supplied to the light source by the power supplier. The transmission areas (R, G, B, C, W and Y) on which light from the light source is made incident are sequentially changed. When the ambient information satisfies a predetermined condition, the controller changes the supply power in synchrony with the transmission areas (R, G, B, C, W and Y).

First claim

1 . A projection type display apparatus comprising:
a light source; a light separation device that includes a plurality of transmission areas on which light from the light source is made incident and which each transmit light of a different wavelength; a detector that detects ambient information; a power supplier that supplies power to the light source; and a controller that controls a supply power to be supplied to the light source by the power supplier, wherein the transmission areas, on which light from the light source is made incident, are sequentially changed, and when the ambient information satisfies a predetermined condition, the controller changes the supply power in synchrony with changes in the plurality of transmission areas.

2 . The projection type display apparatus according to claim 1 , wherein when the ambient information satisfies the predetermined condition, the controller changes the supply power so as to reduce a total amount of light that passes through the light separation device compared to the case where the ambient information does not satisfy the predetermined condition.

3 . The projection type display apparatus according to claim 1 , wherein when the ambient information satisfies the predetermined condition, the higher the transmittance of the transmission area, on which light from the light source is made incident, the greater is the reduction, by the controller, in the amount of the supply power.

4 . The projection type display apparatus according to claim 1 , wherein
the detector detects the temperature inside or around the projection type display apparatus to be used as the ambient information, and the controller determines that the ambient information satisfies the predetermined condition when the temperature detected by the detector exceeds a predetermined temperature.

5 . The projection type display apparatus according to claim 1 , wherein
the detector detects the air pressure inside or around the projection type display apparatus to be used as the ambient information, and the controller determines that the ambient information satisfies the predetermined condition when the air pressure detected by the detector becomes lower than a predetermined temperature.

6 . The projection type display apparatus according to claim 1 , wherein
the detector detects the airflow or the wind speed inside the projection type display apparatus to be used as the ambient information, and the controller determines that the ambient information satisfies the predetermined condition when the airflow or wind speed detected by the detector becomes lower than a predetermined airflow or wind speed.

7 . The projection type display apparatus according to claim 1 , further comprising an image forming device that modulates light that passes through the light separation device to form an image in accordance with a video signal, wherein
the controller, based on the ambient information, changes an average power level that is an average value of the supply power per frame in the video signal.

8 . The projection type display apparatus according to claim 7 , wherein the controller reduces the average power level to a predetermined lower limit while keeping a ratio of the supply power that is set for each transmission area constant, then changes the ratio when the ambient information satisfies a predetermined condition.

9 . The projection type display apparatus according to claim 1 , wherein the light separation device comprises a color wheel.

10 . A control method for a projection type display apparatus, comprising:
emitting light from a light source; making the light incident on a light separation device that includes a plurality of transmission areas that each transmit light of a different wavelength; sequentially changing the transmission areas on which light from the light source is made incident; detecting ambient information; and changing a power that is supplied to the light source in synchrony with changes in the transmission areas, based on the ambient information.

Assignees

• Nec Display Solutions Ltd

Inventors

• Yamashita Eisuke

Classifications

• G02B26/008

  in the form of devices for effecting sequential colour changes, e.g. colour wheels · CPC title

• H04N9/3144 Primary

  Cooling systems (cooling of liquid crystal cells in general G02F1/133382; cooling of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/16) · CPC title

• H04N9/3155

  for controlling the light source (light source control per se H05B35/00 – H05B47/00; control of an illumination source for displays in general G09G3/3406) · CPC title

• H04N9/3111

  for displaying the colours sequentially, e.g. by using sequentially activated light sources (sequential projection in colour photography G03B33/08) · CPC title

• G03B33/08

  Sequential recording or projection (G03B33/02, G03B33/04, G03B33/06 take precedence) · CPC title