CN219758643U - Monolithic liquid crystal projector - Google Patents

Abstract

The present utility model relates to a monolithic liquid crystal projector. The single-chip liquid crystal projector comprises a shell, a liquid crystal light valve, a first lens component, a second lens component, a cooling fan and a temperature sensor, wherein the liquid crystal light valve, the first lens component, the second lens component, the cooling fan and the temperature sensor are arranged in the shell; a circulation air duct is formed in the shell, and the circulation air duct comprises: the heat radiator is arranged on at least one of the first channel section, the second channel section, the third channel section and the fourth channel section, and a temperature sensor is arranged at least one of the position of the air outlet adjacent to the first channel section in the third channel section, the position of the air inlet adjacent to the second channel section in the third channel section, the position of the air inlet adjacent to the first channel section in the fourth channel section and the position of the air outlet adjacent to the second channel section in the fourth channel section. The monolithic liquid crystal projector can accurately monitor the real temperature of the liquid crystal light valve.

Description

Monolithic liquid crystal projector

Technical Field

The utility model relates to the technical field of projection devices, in particular to a monolithic liquid crystal projector.

Background

A projector, also known as a projector, is a device that projects images or video onto a curtain. The liquid crystal projector is one type of projector, has the advantages of better color reduction, high resolution, small volume and light weight, is very convenient to carry, and is a main stream product in the current projector market.

At present, in the actual use process of the projector based on the single-chip liquid crystal technology, as the transmissivity of the liquid crystal screen is only 5-7%, and the residual 93-95% of light rays are concentrated on the liquid crystal screen and absorbed by the liquid crystal screen, the actual temperature of the liquid crystal screen is higher than the standard use temperature, cooling equipment such as a fan, a heat exchanger and the like is required to be arranged for forced heat dissipation, the temperature of the liquid crystal screen can be ensured to be lower than the use temperature required by the standard of the liquid crystal screen, and meanwhile, the temperature of the liquid crystal screen is required to be monitored to ensure that the temperature is lower than the required use temperature in normal use. In the projector of the related art, a temperature sensing device for measuring the screen temperature of the liquid crystal screen is arranged on the heat exchanger, indirectly reflects the screen temperature by actually measuring the temperature of the heat exchanger, and monitors the screen temperature.

However, because the environmental temperature in the use environment of the projector is continuously changed, and the cooling efficiency and the like of cooling equipment such as a fan and the like have great influence on the temperature of the monitoring point of the temperature sensing device on the heat exchanger, the temperature detected by the temperature sensing device has great uncertainty, and the correlation with the real temperature of the liquid crystal screen is poor, so that the real temperature of the liquid crystal screen is difficult to accurately monitor.

Disclosure of Invention

Based on this, it is necessary to provide a monolithic liquid crystal projector capable of accurately monitoring the true temperature of the liquid crystal light valve.

The single-chip liquid crystal projector provided by the embodiment of the utility model comprises a shell, a liquid crystal light valve, a first lens component, a second lens component, a cooling fan and a temperature sensor, wherein the liquid crystal light valve, the first lens component, the second lens component, the cooling fan and the temperature sensor are arranged in the shell;

a circulation air duct is formed in the shell, and the circulation air duct comprises:

a first channel segment defined by the first lens assembly and the liquid crystal light valve;

a second channel segment defined by the second lens assembly and the liquid crystal light valve; and

the third channel section is connected between the air outlet of the first channel section and the air inlet of the second channel section; and

the fourth channel section is connected between the air outlet of the second channel section and the air inlet of the first channel section; at least one of the third channel section and the fourth channel section is provided with a radiator, a cooling fan is arranged in the fourth channel section, an air outlet of the cooling fan is communicated with an air inlet of the first channel section, and an air inlet of the cooling fan is communicated with an air outlet of the second channel section;

the temperature sensor is arranged at least one of the position of the third channel section adjacent to the air outlet of the first channel section, the position of the third channel section adjacent to the air inlet of the second channel section, the position of the fourth channel section adjacent to the air inlet of the first channel section and the position of the fourth channel section adjacent to the air outlet of the second channel section.

In one embodiment, the heat sink comprises a first heat sink disposed on the third channel section;

when the temperature sensor is arranged in the third channel section and is adjacent to the air outlet of the first channel section, the temperature sensor is positioned between the air outlet of the first channel section and the first radiator.

In one embodiment, the heat sink includes a second heat sink disposed on the fourth channel segment.

In one embodiment, the liquid crystal light valve is configured as a pellet, and the temperature sensor is disposed at a position corresponding to a longitudinal middle position of the liquid crystal light valve.

In one embodiment, the third channel segment and the fourth channel segment are respectively located on opposite sides of the liquid crystal light valve.

In one embodiment, the first lens assembly includes a front fresnel lens, and an insulating glass disposed between the front fresnel lens and the liquid crystal light valve, the insulating glass and the liquid crystal light valve together defining a first channel segment.

In one embodiment, the monolithic liquid crystal projector further comprises a light cone;

the shell is internally provided with a bracket for installing the light cone, the shell is provided with an installation opening corresponding to the liquid crystal light valve, one end of the bracket, which is close to the liquid crystal light valve, is connected to the installation opening, and the front Fresnel lens is installed at one end of the bracket, which is close to the liquid crystal light valve.

In one embodiment, a first extension wall is arranged in the shell, one end of the first extension wall is connected with the liquid crystal light valve, and the other end of the first extension wall extends in a direction away from the second lens component;

the first extension wall and the wall portion of the housing together define a third channel segment.

In one embodiment, the second lens assembly includes a rear fresnel lens, the rear fresnel lens and the liquid crystal light valve together defining a second channel segment; and/or

The first lens component is positioned on the front side of the liquid crystal light valve, and the second lens component is positioned on the rear side of the liquid crystal light valve.

In one embodiment, the shell is further provided with a second extending wall and a third extending wall which are arranged at intervals;

one end of the second extension wall is connected with the liquid crystal light valve, and the other end extends towards the air inlet of the cooling fan; one end of the third extension wall is connected with the rear Fresnel lens, and the other end of the third extension wall extends towards the air inlet of the cooling fan, so that a space defined by the second extension wall and the third extension wall forms part of a fourth channel section.

The beneficial effects of the monolithic liquid crystal projector are that:

the temperature sensor is arranged in the third channel section and is adjacent to the position of the air outlet of the first channel section; or when the temperature sensor is arranged in the fourth channel section and is adjacent to the position of the air outlet of the second channel section, the temperature sensor can avoid the radiators arranged on the third channel section and the fourth channel section, and compared with the temperature of the liquid crystal light valve represented by the temperature of the heat exchanger which is arranged on the heat exchanger in the related technology, the temperature sensor has the advantages that the testing precision of the temperature sensor is not easily influenced by factors such as the ambient temperature, the heat exchange efficiency and the like, and the temperature state of the real liquid crystal light valve can be accurately reflected.

On the other hand, in the case where the temperature sensor is provided in the third channel section, a position adjacent to the air inlet of the second channel section; or the temperature sensor is arranged in the fourth channel section and is close to the position of the air inlet of the first channel section, so that the consistency and the correlation between the temperatures of the circulating air at the two positions and the temperature of the liquid crystal light valve are good, and the temperature state of the real liquid crystal light valve can be accurately reflected.

Drawings

Fig. 1 is a schematic structural diagram of a monolithic liquid crystal projector according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a monolithic liquid crystal projector according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a circulating air duct in a housing of a monolithic liquid crystal projector according to an embodiment of the present utility model;

FIG. 4 is a schematic view of another angle of FIG. 3;

FIG. 5 is a schematic diagram of another structure of a monolithic liquid crystal projector according to an embodiment of the utility model;

FIG. 6 is a schematic view of another angle of a fourth segment of the monolithic liquid crystal projector shown in FIG. 5;

fig. 7 is a schematic diagram of still another structure of a monolithic liquid crystal projector according to an embodiment of the utility model.

Reference numerals illustrate:

100. a monolithic liquid crystal projector; 10. a housing; 11. an outer wall portion; 12. a first extension wall; 13. a second extension wall; 14. a third extension wall;

20. a liquid crystal light valve; 30. a first lens assembly; 31. a front fresnel lens; 32. a heat insulating glass; 33. a bracket;

50. a second lens assembly; 51. a rear fresnel lens;

61. a temperature sensor;

80. a circulating air duct; 81. a first channel segment; 82. a second channel segment; 83. a third channel segment; 84. a fourth channel segment;

91. a first heat sink; 92. and a second heat sink.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

A monolithic liquid crystal projector according to an embodiment of the present utility model is described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a monolithic liquid crystal projector according to an embodiment of the present utility model, fig. 2 is a cross-sectional view of the monolithic liquid crystal projector according to an embodiment of the present utility model, and fig. 3 is a schematic diagram of an internal circulation duct of a housing in the monolithic liquid crystal projector according to an embodiment of the present utility model.

Referring to fig. 1, 2 and 3, a monolithic liquid crystal projector 100 according to an embodiment of the present utility model includes a housing 10, a liquid crystal light valve 20 disposed in the housing 10, a first lens assembly 30, a second lens assembly 50, a cooling fan (not shown) and a temperature sensor 61, wherein the first lens assembly 30 and the second lens assembly 50 are disposed on opposite sides of the liquid crystal light valve 20, respectively, and the temperature sensor 61 is used for detecting the temperature of circulating wind flowing through a detection end thereof.

A circulation duct 80 is formed in the housing 10, and the circulation duct 80 includes: a first channel segment 81 defined by the first lens assembly 30 and the liquid crystal light valve 20 together; a second channel segment 82, collectively defined by second lens assembly 50 and liquid crystal light valve 20; a third channel section 83 connected between the air outlet of the first channel section 81 and the air inlet of the second channel section 82; and a fourth channel section 84 connected between the air outlet of the second channel section 82 and the air inlet of the first channel section 81; at least one of the third channel section 83 and the fourth channel section 84 is provided with a radiator, the cooling fan is arranged in the fourth channel section 84, the air outlet of the cooling fan is communicated with the air inlet of the first channel section 81, and the air inlet of the cooling fan is communicated with the air outlet of the second channel section 82.

The positions include a position of the third channel section 83 adjacent to the air outlet of the first channel section 81, a position of the third channel section 83 adjacent to the air inlet of the second channel section 82, a position of the fourth channel section 84 adjacent to the air inlet of the first channel section 81, and a position of the fourth channel section 84 adjacent to the air outlet of the second channel section 82, at least one of which is provided with the temperature sensor 61. Of course, the setting positions of the temperature sensors 61 may be any permutation and combination of the above four positions.

In the above-described aspect, in the case where the temperature sensor 61 is provided in the third passage section 83, a position adjacent to the air outlet of the first passage section 81; or when the temperature sensor 61 is arranged in the fourth channel section 84 and is adjacent to the position of the air outlet of the second channel section 82, the temperature sensor 61 can avoid the radiators arranged on the third channel section 83 and the fourth channel section 84, and compared with the temperature sensor arranged on the heat exchanger to represent the temperature of the liquid crystal light valve 20 in the related art, the temperature sensor is not easy to be influenced by factors such as ambient temperature, heat exchange efficiency and the like, and the temperature state of the real liquid crystal light valve 20 can be accurately reflected.

On the other hand, in the case where the temperature sensor 61 is provided in the third channel section 83, a position adjacent to the air inlet of the second channel section 82; or when the temperature sensor 61 is arranged in the fourth channel section 84 and is adjacent to the position of the air inlet of the first channel section 81, the consistency and the correlation between the temperature of the circulating air at the two positions and the temperature of the liquid crystal light valve 20 are good, and the real temperature state of the liquid crystal light valve 20 can be accurately reflected. In the embodiment of the present utility model, the setting position of the temperature sensor 61 is set at least one of the four positions, so that the real temperature state of the liquid crystal light valve 20 can be accurately reflected.

Specifically, when the third channel section 83 is provided with a radiator, by providing the temperature sensor 61 in the third channel section 83 adjacent to the position of the air outlet of the first channel section 81, at which position the circulating air just flows out of the first channel section 81 defined by the first lens assembly 30 and the liquid crystal light valve 20 together, and has not yet dissipated via the radiator in the third channel section 83, the temperature of the circulating air at which position is most likely to reflect the actual temperature state of the liquid crystal light valve 20, and thus the accuracy and reliability of monitoring the temperature of the liquid crystal light valve 20 by the temperature value detected by the temperature sensor 61 provided at this position are high.

When the fourth channel section 84 is provided with a radiator, the temperature sensor 61 is provided in the fourth channel section 84 at a position adjacent to the air outlet of the second channel section 82, and the circulating air is not radiated through the radiator in the fourth channel section 84 after flowing out of the first channel section 81, so that the influence of uncertainty factors such as the radiation efficiency of the radiator in the fourth channel section 84 can be avoided, and the temperature of the circulating air at these positions can also reflect the actual temperature state of the liquid crystal light valve 20.

In an embodiment of the present utility model, the first lens assembly 30 may be, for example, a front fresnel lens assembly, where the first lens assembly 30 includes a front fresnel lens 31, and a heat insulating glass 32 disposed between the front fresnel lens 31 and the liquid crystal light valve 20, and the heat insulating glass 32 and the liquid crystal light valve 20 together define a first channel segment 81.

The liquid crystal light valve 20 may be a liquid crystal panel. The front fresnel lens 31 is used for collimating and shaping the condensed light, and a projection light source (not shown) or the like may be further provided on a side of the front fresnel lens 31 facing away from the second lens assembly 50. A polarizing film is attached to the insulating glass 32, so that polarized light usable for liquid crystal control is transmitted for imaging, and unusable light is reflected. It will be appreciated that, the first channel section 81 is the incident side of the projection light, the temperature of the first channel section 81 will be higher than that of the second channel section 82, the circulating air in the third channel section 83 just flows out of the first channel section 81 defined by the first lens assembly 30 and the liquid crystal light valve 20 together, the temperature sensor 61 is disposed in the third channel section 83, and the measured temperature of the circulating air at the air outlet of the first channel section 81 monitors the temperature of the liquid crystal light valve 20, so that the accuracy and reliability are high.

Further, with reference to fig. 1, 2, and 3, the monolithic liquid crystal projector 100 further includes a light cone; the housing 10 is further provided with a bracket 33 for mounting the light cone, the housing 10 is provided with a mounting opening (not shown) corresponding to the liquid crystal light valve 20, one end of the bracket 33 close to the liquid crystal light valve 20 is connected to the mounting opening, and the front fresnel lens 31 is mounted at one end of the bracket 33 close to the liquid crystal light valve 20. Illustratively, a mounting space K is formed within the housing 10 between the third channel section 83 and the fourth channel section 84, and the bracket 33 may be positioned within the mounting space K.

In the embodiment of the present utility model, the first extension wall 12 is disposed in the housing 10, one end of the first extension wall 12 is connected to the liquid crystal light valve 20, and the other end extends in a direction away from the second lens assembly 50. In this way, the air flow can fully pass through the radiator after exiting from the air outlet of the first channel section 81, and heat exchange can be performed. The first extension wall 12 and the wall portion of the housing 10 together define a third channel segment 83. For example, the first extension wall 12 and the outer wall portion 11 of the housing 10 form part of the third channel section 83, the first extension wall 12 also forming another part of the third channel section 83 with the inner wall of the housing 10. This also allows one end of the third channel section 83 to be connected to the air outlet of the first channel section 81.

In the embodiment of the present utility model, the radiator includes a first radiator 91, and the first radiator 91 is disposed on the third channel section 83. Specifically, the first heat sink 91 is disposed on a part of the outer wall of the housing 10 corresponding to the third channel section 83, and the first heat sink 91 may be made of metal with good heat conductivity.

Further, when the temperature sensor 61 is provided in the third channel section 83 adjacent to the air outlet of the first channel section 81, the temperature sensor 61 may be located between the air outlet of the first channel section 81 and the first heat sink 91.

With continued reference to FIG. 2, second lens assembly 50 may be, for example, a rear Fresnel lens assembly, second lens assembly 50 including a rear Fresnel lens 51, rear Fresnel lens 51 and liquid crystal light valve 20 together defining a second channel segment 82. Further, the first lens assembly 30 is located on the front side of the liquid crystal light valve 20, and the second lens assembly 50 is located on the rear side of the liquid crystal light valve 20.

Illustratively, the front fresnel lens 31, the liquid crystal light valve 20 and the rear fresnel lens 51 are all disposed at intervals and opposite to each other, as before, one end of the first extension wall 12 is connected to the liquid crystal light valve 20, and the inner surface of the housing 10 is also connected to the rear fresnel lens 51, so that the other end of the third channel section 83 is connected to the air inlet of the second channel section 82.

It will be appreciated that when the first lens assembly 30 is a front phenanthrene mirror assembly and the second lens assembly 50 is a rear phenanthrene mirror assembly, the first lens assembly 30 is located on the front side of the second lens assembly 50 in the light transmission direction. First channel segment 81 and first lens assembly 30 are both located on the front side of liquid crystal light valve 20, and second channel segment 82 and second lens assembly 50 are located on the rear side of liquid crystal light valve 20.

And when the first lens assembly 30 is a rear phenanthrene mirror assembly and the second lens assembly 50 is a front phenanthrene mirror assembly, the first lens assembly 30 is positioned at a rear side of the second lens assembly 50 in a light transmission direction. First channel segment 81 and first lens assembly 30 are both located on the rear side of liquid crystal light valve 20, and second channel segment 82 and second lens assembly 50 are located on the front side of liquid crystal light valve 20.

In the embodiment of the present utility model, with continued reference to fig. 2, the housing 10 is further provided with a second extension wall 13 and a third extension wall 14 which are arranged at intervals. One end of the second extension wall 13 is connected to the liquid crystal light valve 20, the other end extends towards the air inlet of the cooling fan, one end of the third extension wall 14 is connected to the rear fresnel lens 51, and the other end extends towards the air inlet of the cooling fan, so that the space defined by the second extension wall 13 and the third extension wall 14 forms part of the fourth channel section 84.

In addition, the heat sink also includes a second heat sink 92, the second heat sink 92 being disposed on the fourth channel section 84. The heat sink 90 may be a heat sink fin disposed outside the fourth channel section 84, such as outside the third extension wall 14.

In some embodiments, the third channel segment 83 and the fourth channel segment 84 may be located on opposite sides of the liquid crystal light valve 20, respectively. Making the layout of the entire monolithic liquid crystal projector 100 more compact.

Next, the circulating air flow in the circulating air duct 80 will be described with reference to fig. 3. The temperature sensor 61 is disposed in the third channel section 83, and is disposed between the air outlet of the first channel section 81 and the first radiator 91 disposed on the third channel section 83, which is similar to the case where the temperature sensor 61 is disposed at other positions in the circulation duct 80, and will not be repeated herein.

As shown by the arrow in fig. 3, the air flow generated by the cooling fan enters between the insulating glass 32 and the liquid crystal light valve 20 through the air inlet of the first channel section 81 and continues to flow into the third channel section 83, the air flow takes away the heat on the liquid crystal light valve 20, at this time, the air flow flows through the temperature sensor 61 in the third channel section 83, and the temperature of the air flow is relatively high due to the fact that the air just leaves the first channel section 81, that is, the temperature difference between the air flow and the temperature of the liquid crystal light valve 20 is relatively small, and the temperature detected at the position is relatively stable and consistent with the temperature of the liquid crystal light valve 20. After the air flow flows through the first radiator 91 arranged in the third channel section 83, the first radiator 91 cools the air flow, the cooled air flow enters the second channel section 82 between the rear Fresnel lens 51 and the liquid crystal light valve 20, and after fully exchanging heat with the liquid crystal light valve 20, the air flow continuously flows into the fourth channel section 84, radiates heat through the second radiator 92 arranged in the fourth channel section 84, and the cooled air flow enters the cooling fan again, so that a cooling cycle is completed. The heat dissipated from the liquid crystal light valve 20 is taken away by the airflow, and the circulating airflow is cooled by the first radiator 91 and the second radiator 92, so as to achieve the purpose of cooling the liquid crystal light valve 20.

In the embodiment of the present utility model, in combination with fig. 2 and 3, a case is shown in which the temperature sensor 61 is provided only at a position adjacent to the air outlet of the first passage section 81 in the third passage section 83. At this position, the temperature of the air is relatively highest when the air just leaves the first channel section 81, that is, the temperature difference between the air and the temperature of the liquid crystal light valve 20 is smallest, and the temperature detected at this position is the most stable and consistent temperature difference relative to the temperature of the liquid crystal light valve 20.

Of course, in addition to this, the temperature sensor may also be arranged only in the third channel section 83 adjacent to the inlet opening of the second channel section 82. Or only in the fourth channel section 84 adjacent to the inlet of the first channel section 81 or only in the fourth channel section 84 adjacent to the outlet of the second channel section 82.

Fig. 4 is a schematic view of another angle of fig. 3. Referring to fig. 4, the liquid crystal light valve 20 is configured as a sheet-like device, and the temperature sensor 61 is disposed at a position corresponding to a central position in the longitudinal direction of the liquid crystal light valve 20, which can receive a temperature flowing through the center of the liquid crystal light valve 20, that is, a wind flow at a position having a highest temperature, so that the temperature of the liquid crystal light valve 20 can be detected more accurately.

Fig. 5 is a schematic view of another structure of a monolithic liquid crystal projector according to an embodiment of the utility model, fig. 6 is a schematic view of another angle of a fourth segment in the monolithic liquid crystal projector shown in fig. 5, and fig. 7 is a schematic view of yet another structure of the monolithic liquid crystal projector according to an embodiment of the utility model.

The monolithic liquid crystal projector 100 further includes a controller electrically connected to the temperature sensor 61, the controller being configured to be able to adjust the rotational speed of the cooling fan according to the temperature value detected by the temperature sensor 61. The controller is further configured to be able to monitor the heat radiation efficiency of the circulation duct 80 according to the temperature value detected by the temperature sensor 61. In particular, when the temperature difference detected by the temperature sensor 61 is monitored by the controller, if the temperature difference is smaller than the preset value, it is determined that the situation that the wind resistance of the circulation air duct 80 is too large or the heat dissipation performance of the heat radiator is poor is likely to occur, which results in lower heat dissipation efficiency.

Referring to fig. 6, as described above, the position where the temperature sensor 61 is provided corresponds to the longitudinal middle position of the liquid crystal light valve 20. In other words, the temperature sensor 61 is disposed at a central position of the air outlet of the fan cavity 15, and the air temperature at this position is homogenized by the cooling fan and blown out, and the temperature difference between the air temperature and the liquid crystal light valve 20 is also relatively consistent, which is also a preferred position for monitoring the temperature of the liquid crystal light valve 20.

As described above, the setting position of the temperature sensor 61 may be at least one of the four positions described above. Of course, a scheme of two being located at the same time is included.

Referring to fig. 5, as one possible embodiment, there are two temperature sensors 61, and a part of the temperature sensors 61 is disposed in the third channel section 83 adjacent to the air outlet of the first channel section 81 (corresponding to the right side of the drawing in fig. 5), and a part of the temperature sensors 61 is disposed in the fourth channel section 84 adjacent to the air inlet of the first channel section 81 (corresponding to the left side of the drawing in fig. 5).

Referring to fig. 7, as another possible embodiment, when the second heat sinks 92 are provided on the fourth channel section 84, a part of the temperature sensors 61 are provided in the third channel section 83 adjacent to the air inlet of the second channel section 82 (corresponding to the right side of the drawing in fig. 7), and a part of the temperature sensors 61 are provided in the fourth channel section 84 adjacent to the air outlet of the second channel section 82 (corresponding to the left side of the drawing in fig. 7).

In addition, in the arrangement of the temperature sensor 61 shown in fig. 7, the arrangement position of the temperature sensor 61 corresponds to the middle position of the liquid crystal light valve 20 in the longitudinal direction, and the temperature that can be received at this position is the air flow flowing through the center of the liquid crystal light valve 20, that is, the position with the highest temperature, so that the temperature of the liquid crystal light valve 20 can be detected more accurately.

Further, the temperature sensor 61 in the embodiment of the present utility model may be configured as a negative temperature coefficient thermistor, a positive temperature coefficient thermistor, a semiconductor temperature sensor, or the like.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. The single-chip liquid crystal projector is characterized by comprising a shell, a liquid crystal light valve, a first lens component, a second lens component, a cooling fan and a temperature sensor, wherein the liquid crystal light valve, the first lens component, the second lens component, the cooling fan and the temperature sensor are arranged in the shell, the first lens component and the second lens component are respectively arranged on two opposite sides of the liquid crystal light valve, and the temperature sensor is used for detecting the temperature of circulating wind flowing through a detection end of the liquid crystal light valve;

a circulation air duct is formed in the shell, and the circulation air duct comprises:

a first channel segment defined by the first lens assembly and the liquid crystal light valve;

a second channel segment defined by the second lens assembly and the liquid crystal light valve; and

the third channel section is connected between the air outlet of the first channel section and the air inlet of the second channel section; and

the fourth channel section is connected between the air outlet of the second channel section and the air inlet of the first channel section; the cooling fan is arranged in the fourth channel section, an air outlet of the cooling fan is communicated with an air inlet of the first channel section, and an air inlet of the cooling fan is communicated with an air outlet of the second channel section;

the temperature sensor is arranged at least one of the position of the third channel section adjacent to the air outlet of the first channel section, the position of the third channel section adjacent to the air inlet of the second channel section, the position of the fourth channel section adjacent to the air inlet of the first channel section and the position of the fourth channel section adjacent to the air outlet of the second channel section.

2. The monolithic liquid crystal projector of claim 1, wherein the heat sink comprises a first heat sink disposed on the third channel segment;

when the temperature sensor is arranged in the third channel section and is adjacent to the air outlet of the first channel section, the temperature sensor is positioned between the air outlet of the first channel section and the first radiator.

3. The monolithic liquid crystal projector of claim 1 or 2, wherein the heat sink comprises a second heat sink disposed on the fourth channel section.

4. The single-chip liquid crystal projector according to claim 1 or 2, wherein the liquid crystal light valve is configured as a sheet-like device, and the temperature sensor is disposed at a position corresponding to a lengthwise middle position of the liquid crystal light valve.

5. The monolithic liquid crystal projector of claim 1 or 2, wherein the third channel segment and the fourth channel segment are located on opposite sides of the liquid crystal light valve, respectively.

6. The monolithic liquid crystal projector of claim 1 or 2, wherein the first lens assembly comprises a front fresnel lens and an insulating glass disposed between the front fresnel lens and the liquid crystal light valve, the insulating glass and the liquid crystal light valve together defining the first channel segment.

7. The monolithic liquid crystal projector of claim 6, further comprising a light cone;

the LED light source is characterized in that a support for mounting the light cone is further arranged in the shell, a mounting opening corresponding to the liquid crystal light valve is formed in the shell, one end, close to the liquid crystal light valve, of the support is connected to the mounting opening, and the front Fresnel lens is mounted at one end, close to the liquid crystal light valve, of the support.

8. The monolithic liquid crystal projector of claim 7, wherein a first extension wall is disposed within the housing, the first extension wall having one end connected to the liquid crystal light valve and another end extending away from the second lens assembly;

the first extension wall and a wall portion of the housing together define the third channel segment.

9. The monolithic liquid crystal projector of claim 1 or 2, wherein the second lens assembly comprises a rear fresnel lens, the rear fresnel lens and the liquid crystal light valve together defining the second channel segment; and/or

The first lens component is positioned on the front side of the liquid crystal light valve, and the second lens component is positioned on the rear side of the liquid crystal light valve.

10. The monolithic liquid crystal projector of claim 9, wherein second and third extension walls are further disposed in the housing in a spaced apart arrangement;

one end of the second extension wall is connected with the liquid crystal light valve, and the other end extends towards the air inlet of the cooling fan; one end of the third extension wall is connected to the rear Fresnel lens, and the other end of the third extension wall extends towards the air inlet of the cooling fan, so that a space defined by the second extension wall and the third extension wall forms part of the fourth channel section.