# US 10,122,979 B2 · Projector and method of controlling projector

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- Number: US 10,122,979 B2
- Document ID: US10122979B2
- Status: Granted
- Kind: B2
- Application number: 15/427,734
- Filed: 2017-02-08
- Published: 2017-09-21
- Granted: 2018-11-06
- Earliest claimed: 2016-03-16
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Hideaki Nishizawa; Satoru Nasukawa; Takao Hirakura; Shohei Minato
- Web page: https://patentgrep.com/patent/US10122979B2

## CPC

- H04N 9/3185: {Geometric adjustment, e.g. keystone or convergence (optical or mechanical adjustment of convergence H04N9/317; using scanning means H04N3/22; optical or mechanical adjustments of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/14)}
- G02B 26/08: for controlling the direction of light (in light guides G02B6/35)
- G02B 26/0816: {by means of one or more reflecting elements}
- G03B 21/005: {Projectors using an electronic spatial light modulator but not peculiar thereto}
- G03B 21/142: {Adjusting of projection optics}
- H04N 9/312: {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)}
- H04N 9/3141: {Constructional details thereof (details not peculiar to the presence of an electronic spatial light modulator G03B21/14)}
- H04N 9/3188: {Scale or resolution adjustment (scaling in general G06T3/40; resolution modifying circuits for displays in general G09G5/391)}
- H04N 9/3194: {including sensor feedback}
- H04N 5/04: Synchronising (for television systems using pulse code modulation H04N7/56)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)

## Abstract

A projector includes: an I/F unit to which an image signal is input; a display unit that displays an image based on the image signal input to the I/F unit; a shift device that changes a position of an image to be displayed by the display unit; a signal processing unit that outputs a driving signal to the shift device and drives the shift device; and a shift control unit that controls the driving signal output by the signal processing unit. The shift control unit changes an output timing of the driving signal to correspond to a change in a frequency of the image signal.

## Claims

### Claim 1

A projector comprising:
a processor configured to receive an image signal as an input;
a display that displays an image based on the inputted image signal; and
an image displacement unit that changes a position of the image displayed by the display, wherein
the processor is configured to:
output a driving signal to the image displacement unit to drive the image displacement unit; and
control the outputted driving signal such that an output timing of the driving signal is changed corresponding to a change in a frequency of the image signal by correcting a delay time of the output timing based on a difference between the frequency of the image signal and a preset frequency.

### Claim 2 (depends on 1)

The projector according to claim 1, further comprising:
a memory that stores information in which the frequency of the image signal is associated with the output timing of the driving signal,
wherein the processor acquires the output timing associated with the frequency of the image signal from the memory and outputs the driving signal at the acquired output timing.

### Claim 3 (depends on 1)

The projector according to claim 1, wherein the processor calculates the output timing associated with the frequency of the image signal and outputs the driving signal at the calculated output timing.

### Claim 4 (depends on 1)

The projector according to claim 1, wherein the processor sets a delay time of the output timing of the driving signal with respect to a vertical synchronization signal of the image signal.

### Claim 5 (depends on 1)

The projector according to claim 1, wherein the processor changes the output timing of the driving signal in a case in which the frequency of the image signal is different from the preset frequency.

### Claim 6 (depends on 5)

The projector according to claim 5, further comprising:
a memory that stores information in which the frequency of the image signal is associated with the output timing of the driving signal;
wherein the processor is configured to:
detect the frequency of the image signal;
calculate a correction value for correcting the output timing of the driving signal in a case in which the detected frequency is different from the preset frequency; and
correct the output timing of the driving signal acquired from the memory based on the calculated correction value.

### Claim 7 (depends on 6)

The projector according to claim 6, wherein the processor is configured to:
calculate a correction value for latening the output timing of the driving signal in response to the detected frequency being less than the preset frequency, and
calculate a correction value for advancing the output timing of the driving signal in response to the detected frequency being greater than the preset frequency.

### Claim 8 (depends on 1)

The projector according to claim 1, wherein:
the image displacement unit includes:
an optical member,
a movable unit that holds the optical member, and
an actuator that pivots the movable unit, and
the processor changes a current value of a driving current to be supplied as the driving signal to the image displacement unit according to the frequency of the image signal.

### Claim 9 (depends on 8)

The projector according to claim 8, wherein:
the processor increases the current value of the driving current to be supplied to the image displacement unit in response to the frequency of the image signal being greater than the preset frequency, and
the processor decreases the current value of the driving current to be supplied to the image displacement unit in response to the frequency of the image signal being less than the preset frequency.

### Claim 10

A projector comprising:
a sensor that detects an attitude of the projector;
a processor configured to receive an image signal as an input;
a display that displays an image based on the inputted image signal; and
an image displacement unit that includes an optical member held to be pivotable and changes a position of an image displayed by the display to a first display position and a second display position according to the detected attitude of the optical member, wherein
the processor is configured to:
output a driving signal to the image displacement unit to drive the image displacement unit; and
control the outputted driving signal by setting a waveform of the outputted driving signal output according to the attitude of the projector detected by the sensor.

### Claim 11

A method of controlling a projector, the method comprising:
inputting an image signal;
displaying, by a display, an image based on the image signal;
driving an image displacement unit according to a driving signal to change a position of the image to be displayed by the display; and
changing an output timing at which the driving signal is output to the image displacement unit according to a change in a frequency of the image signal by correcting a delay time of the output timing based on a difference between the frequency of the image signal and a preset frequency.