# US 2021/0280107 A1 · Liquid crystal projector

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- Number: US 2021/0280107 A1
- Document ID: US20210280107A1
- Status: Published application
- Kind: A1
- Application number: 17/189,829
- Filed: 2021-03-02
- Published: 2021-09-09
- Earliest claimed: 2020-03-03
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Hiroyuki HOSAKA
- Web page: https://patentgrep.com/patent/US20210280107A1

## CPC

- G09G 3/007: {Use of pixel shift techniques, e.g. by mechanical shift of the physical pixels or by optical shift of the perceived pixels}
- H04N 9/3188: {Scale or resolution adjustment (scaling in general G06T3/40; resolution modifying circuits for displays in general G09G5/391)}
- G09G 3/3607: {for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels (display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127)}
- H04N 9/317: {Convergence or focusing systems (electronic adjustment of convergence H04N9/3185; convergence or focusing arrangements for cathode ray tubes H04N9/28; means for automatic focusing of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/53)}
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A liquid crystal projector includes: a liquid crystal panel including a plurality of panel pixels; a shift device that shifts projection positions of the plurality of panel pixels; and a display control circuit that controls the liquid crystal panel and the shift device, in which the display control circuit controls the liquid crystal panel to cause one of the panel pixels to represent k (k is an integer equal to or more than 3) display pixels that are in a non-adjacent relationship in k unit periods in a frame period, and the display control circuit controls the shift device to vary the projection position for each of the k unit periods.

## Claims

### Claim 1

A liquid crystal projector comprising:
a liquid crystal panel including a plurality of panel pixels;
a shift device that shifts projection positions of the plurality of panel pixels; and
a display control circuit that controls the liquid crystal panel and the shift device, wherein
the display control circuit controls the liquid crystal panel to cause one of the panel pixels to represent k display pixels that are in a non-adjacent relationship in k unit periods in a frame period, k being an integer equal to or greater than 3, and
the display control circuit controls the shift device to vary the projection position for each of the k unit periods.

### Claim 2 (depends on 1)

The liquid crystal projector according to claim 1, wherein
the display pixels and the panel pixels are arranged in a matrix manner along a first axis and a second axis, and
the k display pixels are not adjacent to each other along the first axis and are not adjacent to each other along the second axis.

### Claim 3 (depends on 1)

The liquid crystal projector according to claim 1, wherein
the display control circuit controls the shift device such that an amount of shift of a projection position from a projection position in a first unit period to a projection position in a second unit period is equal to an amount of shift of a projection position from the projection position in the second unit period to a projection position in a third unit period.

### Claim 4 (depends on 3)

The liquid crystal projector according to claim 3, wherein
the display control circuit controls the shift device such that an angle formed by a first direction and a second direction is equal to an angle formed by the second direction and a third direction,
the first direction being a direction in which the projection position in the first unit period is shifted to the projection position in the second unit period,
the second direction being a direction in which the projection position in the second unit period is shifted to the projection position in the third unit period, and
the third direction being a direction in which the projection position in the third unit period is shifted to a projection position in a following unit period.

### Claim 5 (depends on 1)

The liquid crystal projector according to claim 1, wherein
the liquid crystal panel includes:
a first liquid crystal panel corresponding to a first color;
a second liquid crystal panel corresponding to a second color different from the first color; and
a third liquid crystal panel corresponding to a third color different from the first color or the second color, wherein
a panel pixel in the first liquid crystal panel, a panel pixel in the second liquid crystal panel, and a panel pixel in the third liquid crystal panel are combined.