Projector having adjustment circuit and method of controlling projector

Patent metadata

Field	Value
Publication number	US-11895443-B2
Application number	US-202217848541-A
Country	US
Kind code	B2
Filing date	Jun 24, 2022
Priority date	Jun 25, 2021
Publication date	Feb 6, 2024
Grant date	Feb 6, 2024

Abstract

A projector includes: an electro-optical panel including a plurality of pixels; an optical-path shift element configured to change an optical path of light emitted from the plurality of pixels; and an image processing circuit configured to, in a unit period, supply an image signal to the plurality of pixels in an order, the unit period being included in one frame period for displaying an image of one frame indicated by an input image signal, the image signal corresponding to the plurality of pixels and being generated on a basis of the input image signal, in which the image processing circuit includes an adjustment circuit configured to adjust a response velocity of the plurality of pixels when the image displayed by the electro-optical panel is switched, on a basis of an order of supply of the image signal or of a position of a pixel at the electro-optical panel.

First claim

What is claimed is:

1. A projector comprising:
an electro-optical panel including a plurality of pixels;
an optical-path shift element configured to change an optical path of light emitted from the plurality of pixels; and
an image processing circuit configured to supply image signals to the plurality of pixels in a predetermined order in a unit period included in one frame period for displaying one frame of an image indicated by an input image signal, the image signals being generated in response to the input image signal and corresponding to the plurality of pixels, wherein
the image processing circuit includes an adjustment circuit configured to adjust a response velocity of the plurality of pixels at a time of switching the image displayed by the electro-optical panel, based on the order in which the image signals are supplied or positions of the plurality of pixels at the electro-optical panel,
the plurality of pixels include a first pixel and a second pixel, the first pixel being supplied with the image signal in a first half of the order, the second pixel being supplied with the image signal in a second half of the order,
the one frame period includes a first unit period and a second unit period subsequent to the first unit period, and
in the second unit period, the adjustment circuit
corrects a gradation value of the image signal to be supplied to the first pixel to reduce a difference between a gradation value of the image signal to be supplied to the first pixel in the second unit period and a gradation value of the image signal supplied to the first pixel in the first unit period, and
corrects a gradation value of the image signal to be supplied to the second pixel to increase a difference between a gradation value of the image signal to be supplied to the second pixel in the second unit period and a gradation value of the image signal supplied to the second pixel in the first unit period.

2. A projector comprising:
an electro-optical panel including a plurality of pixels;
an optical-path shift element configured to change an optical path of light emitted from the plurality of pixels; and
an image processing circuit configured to supply image signals to the plurality of pixels in a predetermined order in a unit period included in one frame period for displaying one frame of an image indicated by an input image signal, the image signals being generated in response to the input image signal and corresponding to the plurality of pixels, wherein
the image processing circuit includes an adjustment circuit configured to adjust a response velocity of the plurality of pixels at a time of switching the image displayed by the electro-optical panel, based on the order in which the image signals are supplied or positions of the plurality of pixels at the electro-optical panel,
the adjustment circuit
performs overdrive processing of determining, based on a gradation indicated by the image signal, a compensation amount for compensating the response velocity, and
adjusts, based on the order in which the image signals are supplied, for each of the plurality of pixels, the compensation amount determined through the overdriving processing to generate the image signal based on the compensation amount after the adjustment,
the plurality of pixels include a first pixel and a second pixel, the first pixel being supplied with the image signal in a first half of the order, the second pixel being supplied with the image signal in a second half of the order, and
the adjustment circuit
makes the compensation amount used to generate the image signal supplied to the first pixel smaller than the compensation amount determined through the overdrive processing, and
makes the compensation amount used to generate the image signals supplied to the second pixel larger than the compensation amount determined through the overdrive processing.

3. A projector comprising:
an electro-optical panel including a plurality of pixels;
an optical-path shift element configured to change an optical path of light emitted from the plurality of pixels; and
an image processing circuit configured to supply image signals to the plurality of pixels in a predetermined order in a unit period included in one frame period for displaying one frame of an image indicated by an input image signal, the image signals being generated in response to the input image signal and corresponding to the plurality of pixels, wherein
the image processing circuit includes an adjustment circuit configured to adjust a response velocity of the plurality of pixels at a time of switching the image displayed by the electro-optical panel, based on the order in which the image signals are supplied or positions of the plurality of pixels at the electro-optical panel,
the adjustment circuit
performs overdrive processing of determining, based on a gradation indicated by the image signal, a compensation amount for compensating the response velocity, and
adjusts, based on the order in which the image signals are supplied, for each of the plurality of pixels, the compensation amount determined through the overdriving processing to generate the image signal based on the compensation amount after the adjustment,
the plurality of pixels include a first pixel and a second pixel, the first pixel being supplied with the image signals in a first half of the order, the second pixel being supplied with the image signals in a second half of the order,
the unit period includes a first period and a second period subsequent to the first period,
the adjustment circuit
makes the compensation amount used to generate the image signal supplied to the first pixel in the first period smaller than the compensation amount determined through the overdrive processing, and
makes the compensation amount used to generate the image signal supplied to the second pixel in the first period larger than the compensation amount determined through the overdrive processing, and
the adjustment circuit does not change the compensation amount used to generate the image signals supplied to the first pixel in the second period and the compensation amount used to generate the image signals supplied to the second pixel in the second period, from the compensation amount determined through the overdrive processing.

Assignees

• Seiko Epson Corp

Inventors

• Aoki Toru

Classifications

• H04N9/3135 Primary

  Driving therefor · CPC title

• H04N9/312

  Driving therefor (driving of electronic spatial light modulators in displays other than projection devices G09G3/34, G09G3/36; control of liquid crystal elements G02F1/133; control of micromechanical modulators G02B26/08) · CPC title

• H04N9/3132

  using one-dimensional electronic spatial light modulators · CPC title

• H04N9/3188 Primary

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

• H04N9/3105

  for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators (simultaneous projection in colour photography G03B33/10; beam splitting or combining systems per se G02B27/10) · CPC title