Projector and control method for projector

Patent metadata

Field	Value
Publication number	US-12149871-B2
Application number	US-202318372404-A
Country	US
Kind code	B2
Filing date	Sep 25, 2023
Priority date	Jun 25, 2021
Publication date	Nov 19, 2024
Grant date	Nov 19, 2024

Abstract

A projector including an electro-optical panel in which a plurality of pixels are arrayed, an optical path shifting element configured to change an optical path of light emitted from the plurality of pixels, and a control circuit configured to control a state of the optical path shifting element such that light emitted from a predetermined pixel among the plurality of pixels reaches a first position on a display screen in the first unit period, control a state of the optical path shifting element such that light emitted from the predetermined pixel reaches a second position on the display screen in the second unit period, and control a state of the optical path shifting element in a transition period in which a unit period transitions from the first unit period to the second unit period based on a type of image indicated by an input image signal.

First claim

What is claimed is:

1. A projector comprising:
an electro-optical panel in which a plurality of pixels are arrayed;
an optical path shifting element configured to change an optical path of light emitted from the plurality of pixels;
an image processing circuit configured to supply a first image signal based on an input image signal to the electro-optical panel in a first unit period among a plurality of unit periods included in one frame period and supply a second image signal based on the input image signal to the electro-optical panel in a second unit period after the first unit period among the plurality of unit periods; and
a control circuit configured to control a state of the optical path shifting element such that light emitted from a predetermined pixel among the plurality of pixels reaches a first position on a display screen in the first unit period, control a state of the optical path shifting element such that light emitted from the predetermined pixel reaches a second position on the display screen in the second unit period, and control, based on a type of image indicated by the input image signal, a state of the optical path shifting element in a transition period in which a unit period transitions from the first unit period to the second unit period, wherein
the control circuit controls a state of the optical path shifting element such that light emitted from the predetermined pixel reaches a third position on the display screen in the transition period, and
the image processing circuit generates a third image signal to be supplied to the electro-optical panel based on the first image signal and the second image signal in the transition period.

2. The projector according to claim 1 , wherein
the control circuit controls, based on the type of the image, at least one of a speed of change and an amount of change of the state of the optical path shifting element in the transition period.

3. The projector according to claim 1 , wherein
the image processing circuit includes an overdrive processing circuit configured to perform overdrive processing to determine a compensation amount for compensating response characteristics of the electro-optical panel based on a grayscale indicated by the first image signal and a grayscale indicated by the second image signal, and
the overdrive processing circuit adjusts the compensation amount determined in the overdrive processing based on the type of the image.

4. The projector according to claim 1 , wherein
the third position is an intermediate position between the first position and the second position.

5. The projector according to claim 4 , wherein
the image processing circuit supplies a third image signal based on the input image signal to the electro-optical panel as the image signal in a third unit period after the second unit period among the plurality of unit periods included in one frame period, and supplies a fourth image signal based on the input image signal to the electro-optical panel as the image signal in a fourth unit period after the third unit period among the plurality of unit periods,
the control circuit controls a state of the optical path shifting element such that light emitted from the predetermined pixel among the plurality of pixels reaches a fourth position on the display screen in the third unit period, controls a state of the optical path shifting element such that light emitted from the predetermined pixel reaches a fifth position on the display screen in the fourth unit period, and controls a state of the optical path shifting element such that light emitted from the predetermined pixel reaches the third position on the display screen in a transition period in which the unit period transitions from the third unit period to the fourth unit period, and
the third position is an intermediate position between the fourth position and the fifth position.

6. The projector according to claim 5 , wherein
the first position and the second position are positioned in a first diagonal direction with respect to a direction in which the plurality of pixels are arrayed, and the fourth position and the fifth position are in a second diagonal direction with respect to the direction in which the plurality of pixels are arrayed, the second diagonal direction being a direction orthogonal to the first diagonal direction.

7. A projector comprising:
an electro-optical panel in which a plurality of pixels are arrayed;
an optical path shifting element configured to change an optical path of light emitted from the plurality of pixels;
an image processing circuit configured to supply a first image signal based on an input image signal to the electro-optical panel in a first unit period among a plurality of unit periods included in one frame period and supply a second image signal based on the input image signal to the electro-optical panel in a second unit period after the first unit period among the plurality of unit periods; and
a control circuit configured to control a state of the optical path shifting element such that light emitted from a predetermined pixel among the plurality of pixels reaches a first position on a display screen in the first unit period, control a state of the optical path shifting element such that light emitted from the predetermined pixel reaches a second position on the display screen in the second unit period, and control, based on a type of image indicated by the input image signal, a state of the optical path shifting element in a transition period in which a unit period transitions from the first unit period to the second unit period, wherein
the control circuit controls a state of the optical path shifting element such that light emitted from the predetermined pixel reaches a third position on the display screen in the transition period, and
the third position is deviated from an intermediate position between the first position and the second position.

8. The projector according to claim 7 , wherein
the control circuit switches a direction in which a position of light emitted from a predetermined pixel of the plurality of pixels transitions from the first position to the third position on the display screen and a direction in which a position of the light transitions from the third position to the second position based on whether the one frame period is a frame period of an odd-numbered frame or a frame period of an even-numbered frame.

9. The projector according to claim 8 , wherein
a subframe period including the first unit period, the transition period, and the second unit period is repeated at least twice in the one frame period, and a position that the light emitted from the predetermined pixel reaches on the display screen differs in the transition period in an odd-numbered subframe period of the one frame period.

10. The projector according to claim 1 , wherein
the control circuit causes a transition between the first position and the second position based on the type of the image indicated by the input image signal.

11. A projector comprising:
an electro-optical panel in which a plurality of pixels are arrayed;
an optical path shifting element configured to change an optical path of light emitted from the plurality of pixels;
an image processing circuit configured to supply a first image signal based on an input image signal to the electro-optical panel in a first unit period among a plurality of unit periods included in one frame period and supply a second image signal based on the input image signal to the electro-optical panel in a second unit period after the first unit period among the plurality of unit periods; and
a control circuit configured to control a state of the op

Assignees

• Seiko Epson Corp

Inventors

• Aoki Toru
• Hosaka Hiroyuki

Classifications

• G09G5/391

  Resolution modifying circuits, e.g. variable screen formats · CPC title

• G09G2320/0285

  using tables for spatial correction of display data · CPC title

• G09G2360/18

  Use of a frame buffer in a display terminal, inclusive of the display panel · CPC title

• G09G3/007 Primary

  Use of pixel shift techniques, e.g. by mechanical shift of the physical pixels or by optical shift of the perceived pixels · CPC title

• G09G2340/16

  Determination of a pixel data signal depending on the signal applied in the previous frame · CPC title