# US 2025/0093757 A1 · Projection device

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- Number: US 2025/0093757 A1
- Document ID: US20250093757A1
- Status: Published application
- Kind: A1
- Application number: 18/291,570
- Filed: 2023-01-19
- Published: 2025-03-20
- Earliest claimed: 2022-10-18
- Assignees: Beijing Boe Display Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Applicants: Beijing Boe Display Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Inventors: Xi LI; Wei ZHANG; Guangquan WANG; Yujie WANG; Jingang WANG; Fengyan CUI; Tianyang HAN; Xiaolong LIU
- Web page: https://patentgrep.com/patent/US20250093757A1

## CPC

- G03B 21/16: Cooling; Preventing overheating
- G03B 21/006: {using LCD's}
- G03B 21/145: {Housing details, e.g. position adjustments thereof}
- G03B 21/2066: {Reflectors in illumination beam (in projection beam G03B21/28)}
- G03B 21/2073: {Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197)}
- G03B 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)}
- G03B 21/53: Means for automatic focusing, e.g. to compensate thermal effects
- 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)}
- H04N 9/3152: {for shaping the light beam (beam shaping per se G02B27/09)}
- 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

The present disclosure provides a projection device, including: a housing, a light source component, and a projection lens; an accommodating space is formed inside the projection device; the projection device further includes a second mirror, a second fan and a lens component in the accommodating space; the second mirror is arranged on a light outgoing side of the light source component and is configured to reflect light emitted from the light source component into the lens component, and the lens component is configured to collimate light; the accommodating space includes an air flowing space including a first subspace and a second subspace; the first subspace is defined by the light source component, the second mirror, the lens component and a part of the housing, and the second subspace is around the first subspace; the second fan is configured to promote internal air within the air flowing space to circulate.

## Claims

### Claim at position 1

1-29. (canceled)

### Claim 30

A projection device, comprising a housing, a light source component, a projection lens, a first heat sink and a first fan, wherein the light source component comprises a light emitting element, wherein
the housing comprises a front surface and a rear surface opposite to each other, the front surface comprises a first opening and a second opening; the housing further comprises a third opening, at least a part of the third opening is in the rear surface; the light emitting element is at the first opening; the projection lens is at the second opening; and the first heat sink is at the third opening of the housing;
wherein the light emitting element, the projection lens, the first heat sink, and the housing together form an accommodating space; and the first fan is on a side of the light emitting component away from the accommodating space; and
the light source component further comprises a light emitting element base, and the light emitting element is on the light emitting element base; the first fan comprises a first air inlet close to the light emitting element base; and the first air inlet and the light emitting element base comprise a first gap therebetween.

### Claim 31 (depends on 30)

The projection device of claim 30, wherein the first air inlet comprises a first region covered by an orthographic projection of the light emitting element base on the first air inlet and a second region on a side of the first region away from the projection lens.

### Claim 32 (depends on 31)

The projection device of claim 31, wherein the first air inlet further comprises a third region on a side of the first region away from the second region, wherein a width of the third region is less than a width of the second region.

### Claim 33 (depends on 31)

The projection device of claim 31, wherein the projection device comprises a base plate;
the base plate is opposite to the housing; the housing and the base plate comprise a first outer air duct therebetween, and/or the base plate is opposite to a portion of the first heat sink, and the portion and the base plate comprise a first outer air duct therebetween; and
the first outer air duct is configured such that air passes through the first outer air duct and then enters the first fan when the projection device is operating; and
wherein the first outer air duct is opposite to the second region.

### Claim 34 (depends on 31)

The projection device of claim 31, wherein the projection device comprises a circuit board;
the circuit board is opposite to the housing; the housing and the circuit board comprise a second outer air duct therebetween; and/or the circuit board is opposite to a portion of the first heat sink, and the portion and the circuit board comprise a second outer air duct therebetween; and
the second outer air duct is configured such that air passes through the second outer air duct and then enters the first fan when the projection device is operating; the second outer air duct is opposite to the second region.

### Claim 35 (depends on 30)

The projection device of claim 30, wherein the first heat sink has an arcuate shape as a whole.

### Claim 36 (depends on 30)

The projection device of claim 30, wherein the first heat sink comprises a wrapping portion and a plurality of first heat dissipation fins on a side of the wrapping portion away from the accommodating space; the wrapping portion covers the third opening, the plurality of first heat dissipation fins comprise a plurality of first heat dissipation portions, respectively, and the first heat sink is configured to allow air to enter the first fan from the first air inlet after passing through the plurality of first heat dissipation portions.

### Claim 37 (depends on 36)

The projection device of claim 36, wherein the projection device comprises at least one of a circuit board and a base plate;
the projection device comprises the circuit board, at least a portion of the first heat dissipation portion is between the wrapping portion and the circuit board, and/or,
the projection device comprises the base plate, at least a portion of the first heat dissipation portion is between the wrapping portion and the base plate; and
wherein the circuit board comprises a second heat dissipation portion on a side of the circuit board close to the housing and/or on a side of the circuit board close to the first heat dissipation portion.

### Claim 38 (depends on 36)

The projection device of claim 36, wherein the wrapping portion comprises a first wrapping sub-portion on a side on which the rear surface of the housing is located, and a second wrapping sub-portion on a different side from the side on which the rear surface of the housing is located; the second wrapping sub-portion and the first wrapping sub-portion are sequentially arranged; the first heat dissipation portion is a heat dissipation fin on a side of the second wrapping sub-portion away from the accommodating space.

### Claim 39 (depends on 30)

The projection device of claim 30, wherein in an operating state of the projection device, the projection lens is higher than the light source component; the housing further comprises a bottom surface and a top surface, the bottom surface is lower than the top surface, and the front surface and the rear surface are connected to the top and bottom surfaces, respectively.

### Claim 40 (depends on 30)

The projection device of claim 30, further comprising:
a first polarizing element on a light outgoing side of the light source component to convert light emitted from the light source component into first polarized light having a first polarization direction;
a display panel on a side of the first polarizing element away from the light source component;
a first lens on a side of the display panel away from the light source component or between the display panel and the first polarizing element;
a first mirror configured to reflect light emitted from the display panel into the projection lens; and
a second polarizing element on a side of the display panel away from the first polarizing element to cause polarized light in the first polarization direction or a second polarization direction to emit outside from the projection lens, wherein the first polarization direction is perpendicular to the second polarization direction;
wherein the first mirror and the second polarizing element are of a same element or different elements; the display panel is a liquid crystal display panel; and
wherein the projection device further comprises a light-transparent part;
the first lens is on a side of the display panel away from the light source component, the light-transparent part is between the light source component and the display panel, and the light-transparent part and the display panel comprise a second gap therebetween; or
the first lens is between the display panel and the first polarizing element, the light-transparent part is between the light source component and the first lens, and the light-transparent part and the first lens comprise a second gap therebetween;
the first polarizing element is attached to the light-transparent part.

### Claim 41 (depends on 40)

The projection device of claim 40, comprising a second fan in the accommodating space and configured to promote internal air in the accommodating space to circulate, so that the internal air exchanges heat through the first heat sink; and
the second fan comprises a second air inlet and a second air outlet, the second air outlet is configured to discharge the internal air, and the second air inlet is configured to suck the internal air, so that the internal air is circularly flow in the accommodating space; a flow path of the internal air comprises the second gap; and
wherein the first lens and the display panel have a third gap therebetween; the flow path of the internal air comprises the third gap, and the third gap and the second gap are disposed side by side; and a flow direction of the internal air in the second gap and a flow direction of the internal air in the third gap are identical or opposite to each other.

### Claim 42 (depends on 41)

The projection device of claim 41, wherein the internal air sequentially flows through the second air outlet, a second air duct, a third air duct, a first air duct, and the second air inlet in an internal circulation; and
the second air duct comprises the second gap; the third air duct comprises the third gap; at least a part of the first heat sink forms a side wall of the first air duct.

### Claim 43 (depends on 42)

The projection device of claim 42, further comprising a second mirror and a second lens; wherein the second mirror is configured to reflect the light emitted from the light emitting element into the second lens; the second lens is configured to collimate light; and
the second fan is on a side of the second mirror away from the light source component; and the second fan and the first heat sink comprise a fourth gap therebetween, and the first air duct comprises the fourth gap.

### Claim 44 (depends on 40)

The projection device of claim 40, further comprising a fixing frame, wherein the display panel and the first lens are inlaid on two opposite sides of the fixing frame, respectively; the first lens and the display panel comprises a third gap therebetween; and
the fixing frame comprises two through sides opposite to each other, and each through side comprises hollowed-out portions.

### Claim 45 (depends on 44)

The projection device of claim 44, wherein the fixing frame comprises two positioning sides opposite to each other; and
two ends of each positioning side are connected to the two through sides, respectively; each positioning side comprises a positioning portion for cooperating with the housing for positioning the fixing frame.

### Claim 46 (depends on 45)

The projection device of claim 45, wherein each positioning portion comprises a rib, and the rib extends in a same direction as the display panel;
the fixing frame further comprises a U-shaped clip; the display panel, the fixing frame, and the first lens are all between both ends of the U-shaped clip, and the U-shaped clip clamps at least one side of the fixing frame; and
the projection device further comprises a matching rib at a position where the U-shaped clip clamps the side of the fixing frame; the matching rib and the rib of the positioning portion are disposed continuously; and
wherein an inner surface of the housing comprises a groove, and the rib cooperates with the groove for positioning the fixing frame; and
one of the two through sides is arranged to face the first heat sink.

### Claim 47 (depends on 30)

The projection device of claim 30, comprising a focusing component for adjusting a focus of the projection lens;
wherein the focusing component comprises a sensing component and a driving component; the sensing component is configured to measure a projection distance between the projection lens and a projected image; the driving component is configured to drive the projection lens to adjust the focus according to the measured projection distance;
the driving component comprises a driving motor, an actuator, and a focus adjuster on the projection lens; the driving motor drives the actuator to move, and the actuator is coupled to the focus adjuster.

### Claim 48 (depends on 47)

The projection device of claim 47, wherein the actuator comprises a first gear, and the focus adjuster comprises a transmission gear at an outer circumference of the projection lens, and the first gear and the transmission gear are engaged with each other and coupled with each other;
the focusing component comprises a limiting component for controlling a focusing range for the projection lens;
the limiting component comprises an optical coupler and a baffle plate, and a relative position between the baffle plate and the focalizer is fixed; and
a relative position between the optical coupler and the housing is fixed; the optical coupler is configured to determine whether light is shielded or not by the baffle plate and to send a signal for providing a command to the driving motor; and
wherein the focusing component comprises a focusing ring, and the baffle plate and the transmission gear are secured around the focusing ring.

### Claim 49 (depends on 40)

The projection device of claim 40, further comprising a second fan in the accommodating space and configured to promote internal air in the accommodating space to circulate so that the internal air exchanges heat through the first heat sink;
the second fan comprises a second air inlet and a second air outlet, the second air outlet is configured to discharge the internal air, and the second air inlet is configured to suck the internal air, so that the internal air circularly flows in the accommodating space; and
wherein the second fan is a centrifugal fan; the second air inlet is opposite to the first heat sink.