# US 2013/0155128 A1 · Light source device having first light source, second light source, and control section to control drive timing of first light source and second light source such that drive pattern of second light source is inversion of drive pattern of first light source, and projection apparatus and projection method which utilize said light source device

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- Number: US 2013/0155128 A1
- Document ID: US20130155128A1
- Status: Published application
- Kind: A1
- Application number: 13/766,610
- Filed: 2013-02-13
- Published: 2013-06-20
- Earliest claimed: 2009-06-30
- Assignees: Casio Computer Co., Ltd.
- Inventors: Takeshi Miyazaki
- Web page: https://patentgrep.com/patent/US20130155128A1

## CPC

- H05B 47/10: Controlling the light source
- G03B 21/2013: {Plural light sources}
- G03B 21/204: {using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197)}
- G03B 33/08: Sequential recording or projection (G03B33/02, G03B33/04, G03B33/06 take precedence)
- G09G 3/22: using controlled light sources
- H04N 9/3114: {by using a sequential colour filter producing one colour at a time}
- H04N 9/3155: {for controlling the light source (light source control per se H05B35/00 – H05B47/00; control of an illumination source for displays in general G09G3/3406)}
- H04N 9/3164: {using multiple light sources}
- H05B 47/165: following a pre-assigned programmed sequence; Logic control [LC]
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- 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)
- 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 light source device includes a first light source configured to emit light within a first wavelength band, a second light source configured to emit light within a second wavelength band, and a light source control section configured to control drive timing of the first light source with a first drive pattern, and to control drive timing of the second light source with a second drive pattern which is an inverted pattern of the first drive pattern of the first light source, such that a light emission period for light-source light using light emitted by the second light source is positioned between light emission periods for the light-source light emitted by the first light source, and such that a frequency of the light-source light using light emitted by the second light source is higher than a frequency of light emitted by the first light source.

## Claims

### Claim 1

A light source device comprising:
a first light source configured to emit light within a first wavelength band;
a second light source configured to emit light within a second wavelength band; and
a light source control section configured to control drive timing of the first light source with a first drive pattern, and to control drive timing of the second light source with a second drive pattern which is an inverted pattern of the first drive pattern of the first light source, such that a light emission period for light-source light using light emitted by the second light source is positioned between light emission periods for the light-source light emitted by the first light source, and such that a frequency of the light-source light using light emitted by the second light source is higher than a frequency of light emitted by the first light source.

### Claim 2 (depends on 1)

The light source device according to claim 1, wherein the light source control section intermittently drives the first light source at predetermined time intervals, and intermittently drives the second light source such that the second light source is activated during intermittent periods of the first light source.

### Claim 3 (depends on 1)

The light source device according to claim 1, wherein the light source control section controls the drive timing for each of the first light source and the second light source such that the light emission period for the light-source light using light emitted by the second light source is positioned between the light emission periods for the light-source light emitted by the first light source, and such that the frequency of the light-source light using light emitted by the second light source is synchronized with the frequency of light emitted by the first light source and the frequency of the light-source light using light emitted by the second light source is a plurality of times higher than the frequency of light emitted by the first light source.

### Claim 4 (depends on 1)

The light source device according to claim 1, further comprising a third light source configured to emit light within a third wavelength band;
wherein the light source control section is configured to control drive timing of the second light source with the second drive pattern, and to control drive timing of the third light source with a third drive pattern which is an inverted pattern of the second drive pattern of the second light source, such that a light emission period for light-source light using light emitted by the second light source is positioned between light emission periods for the light-source light emitted by the third light source, and such that a frequency of the light-source light using light emitted by the second light source is higher than a frequency of light emitted by the third light source.

### Claim 5 (depends on 4)

The light source device according to claim 4, wherein the third light source comprises a light-source light production section configured to produce light-source light within the third wavelength band by using light emitted by the first light source.

### Claim 6

A projection apparatus comprising:
a first light source configured to emit light within a first wavelength band;
a second light source configured to emit light within a second wavelength band;
a light source control section configured to control drive timing of the first light source, and to control drive timing of the second light source;
an input section configured to input an image signal; and
a projection section configured to use light-source light emitted based on the control of the light source control section and to form and project a color optical image corresponding to the image signal input through the input section;
wherein the light source control section is configured to control drive timing of the first light source with a first drive pattern, and to control drive timing of the second light source with a second drive pattern which is an inverted pattern of the first drive pattern of the first light source, such that a light emission period for light-source light using light emitted by the second light source is positioned between light emission periods for the light-source light emitted by the first light source, and such that a frequency of the light-source light using light emitted by the second light source is higher than a frequency of light emitted by the first light source.

### Claim 7 (depends on 6)

The projection apparatus according to claim 6, wherein the light source control section intermittently drives the first light source at predetermined time intervals, and intermittently drives the second light source such that the second light source is activated during intermittent periods of the first light source.

### Claim 8 (depends on 6)

The projection apparatus according to claim 6, wherein the light source control section controls the drive timing for each of the first light source and the second light source such that the light emission period for the light-source light using light emitted by the second light source is positioned between the light emission periods for the light-source light emitted by the first light source, and such that the frequency of the light-source light using light emitted by the second light source is synchronized with the frequency of light emitted by the first light source and the frequency of the light-source light using light emitted by the second light source is a plurality of times higher than the frequency of light emitted by the first light source.

### Claim 9 (depends on 6)

The projection apparatus according to claim 6, further comprising a third light source configured to emit light within a third wavelength band;
wherein the light source control section is configured to control drive timing of the second light source with the second drive pattern, and to control drive timing of the third light source with a third drive pattern which is an inverted pattern of the second drive pattern of the second light source, such that a light emission period for light-source light using light emitted by the second light source is positioned between light emission periods for the light-source light emitted by the third light source, and such that a frequency of the light-source light using light emitted by the second light source is higher than a frequency of light emitted by the third light source.

### Claim 10 (depends on 9)

The projection apparatus according to claim 9, wherein the third light source comprises a light-source light production section configured to produce light-source light within the third wavelength band by using light emitted by the first light source.

### Claim 11

A projection method for a projection apparatus including a first light source configured to emit light within a first wavelength band, a second light source configured to emit light within a second wavelength band, a light source control section configured to control drive timing of each of the first light source and the second light source, an input section configured to input an image signal, and a projection section configured to use the light-source light emitted based on the control of the light source control section and form and project a color optical image corresponding to the image signal input through the input section, the method comprising:
controlling drive timing of the first light source with a first drive pattern and controlling drive timing of the second light source with a second drive pattern which is an inverted pattern of the first drive pattern of the first light source, such that a light emission period for light-source light using light emitted by the second light source is positioned between light emission periods for the light-source light emitted by the first light source, and such that a frequency of the light-source light using light emitted by the second light source is higher than a frequency of light emitted by the first light source.