# US 2019/0171092 A1 · Projection-type display device

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- Number: US 2019/0171092 A1
- Document ID: US20190171092A1
- Status: Published application
- Kind: A1
- Application number: 16/324,531
- Filed: 2016-08-25
- Published: 2019-06-06
- Earliest claimed: 2016-08-25
- Assignees: NEC Display Solutions, Ltd.
- Applicants: NEC Display Solutions, Ltd.
- Inventors: Eisuke YAMASHITA
- Web page: https://patentgrep.com/patent/US20190171092A1

## CPC

- G03B 21/16: Cooling; Preventing overheating
- G03B 21/145: {Housing details, e.g. position adjustments thereof}
- H04N 9/3144: {Cooling systems (cooling of liquid crystal cells in general G02F1/133382; cooling of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/16)}
- 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)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A projection-type display device includes: a light source; a dust-proof case; heat-dissipating fins; a heat-dissipation fan that causes cooling air to flow into the heat-dissipating fins; a prism unit that is provided inside the dust-proof case and that separates light from the light source into a multiplicity of illumination light beams; an internal circulation fan; heat-receiving fins; and heat pipes that connect the heat-dissipating fins and the heat-receiving fins. The heat-receiving fins and the heat-dissipating fins are both formed in a substantially rectangular parallelepiped shape, each having, as cooling air inflow surfaces that are effective in heat dissipation or heat reception, a first surface and a second surface whose area is greater than the first surface. The cooling airflow inside the dust-proof case that is supplied by the internal circulation fan flows from the first and second surfaces of the heat-receiving fins.

## Claims

### Claim 1

A projection-type display device comprising:
a light source;
a dust-proof case;
heat-dissipating fins; and
a heat-dissipation fan that causes inflow of cooling airflow to said heat-dissipating fins,
wherein:
a prism unit, that splits light from said light source into a plurality of illumination light beams, and an internal circulation fan and heat-receiving fins are provided inside said dust-proof case;
said heat-dissipating fins and said heat-receiving fins are connected by heat pipes, are both substantially rectangular parallelepipeds in shape, and each have a first surface and a second surface whose area is greater than the first surface;
a cooling airflow inside said dust-proof case that is supplied by said internal circulation fan flows in from said first surface and second surface of said heat-receiving fins; and
a cooling airflow that is supplied by said heat-dissipation fan flows in from said second surface of said heat-dissipating fins.

### Claim 2 (depends on 1)

The projection-type display device as set forth in claim 1, wherein said heat-dissipation fan is set adjacent to said heat-dissipating fins.

### Claim 3 (depends on 1)

The projection-type display device as set forth in claim 1, further comprising:
a plurality of image-forming elements that are provided inside said dust-proof case and that are provided corresponding to each of a plurality of illumination light beams that are split by said prism unit.

### Claim 4 (depends on 3)

The projection-type display device as set forth in claim 3, wherein said plurality of image-forming elements comprise Micro-mirror Devices (DMDs).

### Claim 5 (depends on 1)

The projection-type display device as set forth in claim 1, further comprising:
an optical engine that is provided inside said dust-proof case and includes mirrors and lenses that guide light from said light source to said prism unit.

### Claim 6 (depends on 1)

The projection-type display device as set forth in claim 1, further comprising:
an unnecessary light receiving surface that is provided at a position irradiated by unnecessary light inside said dust-proof case; and
unnecessary light heat-dissipating fins that are provided outside said dust-proof case that is a position that receives cooling airflow realized by said heat-dissipation fan and that are connected with said unnecessary light-receiving surface by way of heat pipes.

### Claim 7 (depends on 1)

The projection-type display device as set forth in claim 1, further comprising:
a cooling duct that covers said prism unit; and
a cooling opening that is provided in said cooling duct and that blows cooling airflow supplied by said internal circulation fan toward said prism unit.