Projector and projection method

Patent metadata

Field	Value
Publication number	US-10861364-B2
Application number	US-201816118920-A
Country	US
Kind code	B2
Filing date	Aug 31, 2018
Priority date	Sep 27, 2017
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

A projector includes a light source unit having a first light source emitting first wavelength range light and a luminescent wheel having a first wavelength range light transmission area and a luminescent material area receiving the first wavelength range light and reflecting second different wavelength range light provided circumferentially end to end, a light source control unit controlling the light source unit, a display device receiving light from the light source unit to form image light, a pixel shifting unit shifting a display position of the image light for each of a plurality of sub-frame periods forming one image frame period, and a control unit controlling the light source control unit and the pixel shifting unit, the control unit synchronizing a timing the pixel shifting unit shifts the display position for each sub-frame period with a timing the emitted light from the light source unit is switched over.

First claim

What is claimed is:

1. A projector comprising:
a light source unit having:
a first light source configured to emit light of a first wavelength range;
a luminescent wheel on which a transmission area configured to transmit the light of the first wavelength range and a luminescent material area on to which the light of the first wavelength range is shone and which is configured to be excited thereby to emit (reflect) light of a second wavelength range that differs from the light of the first wavelength range are provided sequentially in a circumferential direction; and
a third light source configured to emit light of a third wavelength range different from light of the first wavelength range and light of the second wavelength range;

a display device on to which emitted light from the light source unit is shone to form image light;
a parallel and flat glass sheet that makes use of a refracting action of light and shifts a display position of the image light for each sub-frame period of a plurality of sub-frame periods making up one image frame period; and
a processor configured to control the light source unit and the parallel and flat glass sheet,
wherein the processor synchronizes a timing at which the parallel and flat glass sheet shifts the display position for each of the plurality of sub-frame periods with a timing of emission of light of a fourth wavelength range which is a color mixture of light of the second wavelength range and light of the third wavelength range.

2. The projector according to claim 1 ,
wherein the parallel and flat glass sheet is disposed on an optical path between the display device and a projection lens unit with stacked lenses, and the parallel and flat glass sheet has an actuator is configured to change an emerging position relative to an incident position of image light by inclining the parallel and flat glass sheet in a plurality of predetermined directions relative to an optical axis of the parallel and flat glass sheet, and
wherein the processor drives and controls the actuator configured to change the emerging position relative to the incident position of the image light by inclining the parallel and flat glass sheet in one of the plurality of predetermined directions relative to the optical axis of the parallel and flat glass sheet for each of the plurality of sub-frame periods.

3. The projector according to claim 1 ,
wherein the processor turns off the light source unit at a same time that the light of the first wavelength range and light of the second wavelength range are switched over as the emitted light.

4. The projector according to claim 1 ,
wherein display positions of the image light to be shifted are a first state, a second state, a third state and a fourth state.

5. The projector according to claim 1 ,
wherein the processor forms one pixel on the basis of overlapping image areas before and after a shift of each pixel where a display device of the image light is shifted.

6. The projector according to claim 1 , comprising further:
a projection lens unit with stacked lenses on which the image light is incident and which is configured to emit projected light.

7. A projection method for a projector comprising:
a light source unit having:
a first light source configured to emit light of a first wavelength range; and
a luminescent wheel on which a transmission area configured to transmit the light of the first wavelength range and a luminescent material area on to which the light of the first wavelength range is shone and which is configured to be excited thereby to emit (reflect) light of a second wavelength range that differs from the light of the first wavelength range are provided sequentially in a circumferential direction; and

a third light source configured to emit light of a third wavelength range different from light of the first wavelength range and light of the second wavelength range;
a display device on to which emitted light from the light source unit is shone to form image light;
a parallel and flat glass sheet that makes use of a refracting action of light and shifts a display position of the image light for each sub-frame period of a plurality of sub-frame periods making up one image frame period; and
a processor configured to control the light source unit and the parallel and flat glass sheet, the projection method comprising:
synchronizing a timing at which the parallel and flat glass sheet shifts the display position for each of the plurality of sub-frame periods with a timing of emission of light of a fourth wavelength range which is a color mixture of light of the second wavelength range and light of the third wavelength range.

Assignees

• Casio Computer Co Ltd

Inventors

• Masuda Hiroki

Classifications

• H04N9/3158 Primary

  for controlling the spectrum · CPC title

• H04N9/3188

  Scale or resolution adjustment (scaling in general G06T3/40; resolution modifying circuits for displays in general G09G5/391) · CPC title

• H04N9/3164

  using multiple light sources · CPC title

• H04N9/3161

  using laser light sources (using laser beams scanning the display screen H04N9/3129) · CPC title

• G09G2320/0238

  Improving the black level · CPC title