# US 2017/0255091 A1 · Light source system and related projection system

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- Number: US 2017/0255091 A1
- Document ID: US20170255091A1
- Status: Published application
- Kind: A1
- Application number: 15/599,364
- Filed: 2017-05-18
- Published: 2017-09-07
- Earliest claimed: 2012-09-28
- Assignees: Appotronics China Corporation
- Applicants: Appotronics China Corporation
- Inventors: Fei HU; Yi LI; Liangliang CAO; Yi YANG
- Web page: https://patentgrep.com/patent/US20170255091A1

## CPC

- G03B 21/204: {using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197)}
- F21V 14/08: by movement of the screens {or filters}
- G02B 27/141: {using dichroic mirrors}
- G03B 21/005: {Projectors using an electronic spatial light modulator but not peculiar thereto}
- G03B 21/20: Lamp housings
- G03B 21/2013: {Plural light sources}
- G03B 21/2033: {LED or laser light sources}
- G03B 21/206: {Control of light source other than position or intensity}
- G03B 21/2066: {Reflectors in illumination beam (in projection beam G03B21/28)}
- G03B 33/08: Sequential recording or projection (G03B33/02, G03B33/04, G03B33/06 take precedence)
- H04N 9/3105: {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)}
- H04N 9/3114: {by using a sequential colour filter producing one colour at a time}
- H04N 9/3117: {by using a sequential colour filter producing two or more colours simultaneously, e.g. by creating scrolling colour bands}
- 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 9/3158: {for controlling the spectrum}
- H04N 9/3164: {using multiple light sources}
- 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)
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A light source system comprises: a light-emitting device for emitting a first light and a second light in sequence; a beam splitting system with which the first light is divided into one beam in a first range of wavelength and the other beam in a second range of wavelength, respectively emitted along a first optical path and a second optical path, and also with which at least a part of the second light is emitted along the first optical path; a first spatial light modulator for modulating the beam emitted from the beam splitting system along the first optical path; a second spatial light modulator for modulating the beam emitted from the beam splitting system along the second optical path. The light source system has the advantages of high light-emitting efficiency and low cost. A projection system comprising the aforementioned light source system is also provided.

## Claims

### Claim 1

A light source system, comprising:
a light generating device which sequentially generates a first light and a second light; the first light is yellow light and the second light is blue light;
a light division system which divides the first light from the light generating device into a light in a first wavelength range and a light in a second wavelength range and outputs them along a first light path and a second light path, and divides the second light from the light generating device into a first sub-light and a second sub-light and respectively outputs them along the first light path and the second light path;
a first spatial light modulator, which modulates the lights outputted along the first light path of the light division system; and
a second spatial light modulator, which modulates at least a part of the lights outputted along the second light path of the light division system.

### Claim 2 (depends on 1)

The light source system of claim 1, wherein the light generating device includes an excitation light source, a wavelength conversion layer and a first drive device;
wherein the excitation light source generates an excitation light;
wherein the wavelength conversion layer has a first segment and a second segment, the first segment carrying a first wavelength conversion material which absorbs the excitation light and emits the first light, the second segment either carrying a second wavelength conversion material which absorbs the excitation light and emits the second light or being a light transmitting segment which transmits the excitation light as the second light; and
wherein the first drive device drives the wavelength conversion layer such that a light spot formed by the excitation light on the wavelength conversion layer falls on the wavelength conversion layer along a predetermined path and the wavelength conversion layer sequentially generates the first light and the second light.

### Claim 3 (depends on 1)

The light source system of claim 1, wherein the light generating device sequentially outputs the first light, the second light and a third light;
wherein the light division system divides the third light from the light generating device into a light in a fifth wavelength range and a light in a sixth wavelength range and respectively outputs them along the first light path and the second light path;
wherein the first spatial light modulator modulates the light in the first wavelength range, the first sub-light and the light in the fifth wavelength range output from the light division system along the first light path; and
wherein the second spatial light modulator modulates the light in the second wavelength range, the second sub-light and the light in the sixth wavelength range output from the light division system along the second light path.

### Claim 4 (depends on 3)

The light source system of claim 3, wherein the first light and the third light have the same color;
wherein the light division system includes a first light filter plate which reflects the light in the first wavelength range of the first light and transmits the light in the second wavelength range; and
the first light filter plate which transmits the light in the fifth wavelength range of the third light and reflects the light in the sixth wavelength range;
wherein the first light and the third light are incident onto the first light filter plate from its two different sides.

### Claim 5 (depends on 1)

The light source system of claim 1, wherein the first sub-light is blue light and the second sub-light is blue light or green light.

### Claim 6 (depends on 3)

The light source system of claim 3, wherein the third light is yellow light, the light in the second wavelength range and the light in the fifth wavelength range are green light, and the light in the first wavelength range and the light in the sixth wavelength range are red light.

### Claim 7 (depends on 3)

The light source system of claim 3, wherein the light generating device includes a first yellow light source generating the first light, a blue light source generating the second light, a second yellow light source generating the third light and a first control device;
wherein the first control device alternatingly turns on the first yellow light source, the blue light source and the second yellow light source during at least some time intervals, and simultaneously turns on the first yellow light source, the blue light source and the second yellow light source during at least some other time intervals.

### Claim 8 (depends on 7)

The light source system of claim 7, wherein the brightness of the two yellow light sources is controlled to adjust the brightness of the red and green light modulated by the two spatial light modulators.

### Claim 9 (depends on 2)

The light source system of claim 2, wherein the wavelength conversion layer further includes a third segment, the third segment carrying a third wavelength conversion material which absorbs the excitation light and emits a third light;
wherein the first drive device drives the wavelength conversion layer to sequentially generates the first light, the second light and the third light; and
wherein the light division system includes a first light division device having a first segment, a second segment and a third segment, the first segment divides the first light from the light generating device into a light in a first wavelength range and a light in a second wavelength range and outputs them along a first light path and a second light path, the second segment divides the second light from the light generating device into a first sub-light and a second sub-light and respectively outputs them along the first light path and the second light path, and the third segment divides the third light from the light generating device into a light in a fifth wavelength range and a light in a sixth wavelength range and respectively outputs them along the first light path and the second light path; and
wherein the first light division device moves in synchrony with the wavelength conversion layer to achieve light division of the first light, the second light and the third light.

### Claim 10 (depends on 9)

The light source system of claim 9, wherein the wavelength conversion layer and the first light division device are fixedly connected and mounted on a color wheel, and the first drive device drives the color wheel to sequentially generate the first light, the second light and the third light; and
wherein the light generating device further includes a light guiding device which guides the sequence of output lights from the first segment, the second segment and the third segment of the wavelength conversion layer respectively to the first segment, the second segment and the third segment of the first light division device.

### Claim 11 (depends on 9)

The light source system of claim 9, wherein the first segment carries a yellow phosphor, the second segment carries a blue phosphor and the third segment carries a yellow phosphor.

### Claim 12 (depends on 11)

The light source system of claim 11, wherein the first sub-light is blue light and the second sub-light is green light.

### Claim 13 (depends on 1)

A projection system comprising the light source system of claim 1.