Projector ray machine and projector

Abstract

The invention discloses a projector light machine and a projector. The projector light machine comprises a light source, a display module, a front Fresnel lens and a projection lens group which are sequentially arranged from a light source end to a projection screen; the light emitted by the light source enters the display module, the image light emitted by the display module enters the front Fresnel lens, the converged image light is emitted by the front Fresnel lens, and the converged image light is projected to the projection screen by the projection lens group to form a display image; the projector ray machine further comprises an angle adjusting module, the angle adjusting module is connected with the front Fresnel lens, and the angle adjusting module is used for driving the front Fresnel lens to rotate. The projector light machine has an initial elevation angle, the rotation direction of the front Fresnel lens is the same as the direction of the initial elevation angle, the front Fresnel lens is driven to rotate, and the image gradient change caused by rotation of the front Fresnel lens is opposite to the image gradient change caused by the initial elevation angle of the projector light machine in direction, so that the trapezoidal change of the image is automatically adjusted, and a rectangular image is formed. The projection effect is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of projectors, and in particular to a projector optical machine and a projector. Background Art

[0002] A projector, also known as a projector or projector optical machine, is a device that can project images or videos onto a screen and is very popular in the market. Most of the projectors on the market currently do not have an off-axis function, and the center height of the projected image is consistent with the center height of the projector. Generally, the lower half of the image will be blocked by the desktop or other items on the desktop, thus affecting the projector experience. Usually users need to prepare an unobstructed use environment or add a bracket to use it, which increases the time and cost of use. In order to solve this problem, the off-axis function of the projector appeared. Therefore, designing a projector with an off-axis function has become an urgent problem for technicians in related fields to solve. Summary of the invention

[0003] The present invention provides a projector optical machine and a projector, so as to realize the off-axis function of the projector and achieve lossless trapezoidal picture correction.

[0004] In a first aspect, the present invention provides a projector optical machine, comprising a housing, and a light source, a display module, a front Fresnel mirror and a projection lens group located in the housing and arranged in sequence from a light source end to a projection screen;

[0005] The light emitted by the light source is incident on the display module, the image light emitted by the display module is incident on the front Fresnel mirror, the front Fresnel mirror emits the image light after convergence, and the projection lens group projects the converged image light onto the projection screen to form a display image;

[0006] The projector optical machine further includes an angle adjustment module, which is connected to the front Fresnel mirror and is used to drive the front Fresnel mirror to rotate;

[0007] The projector optical machine has an initial elevation angle, and the rotation direction of the front Fresnel mirror is the same as the direction of the initial elevation angle.

[0008] Optionally, the initial elevation angle of the projector optical machine is equal to the rotation angle of the front Fresnel mirror.

[0009] Optionally, the initial elevation angle of the projector optical machine is 5°.

[0010] Optionally, the angle adjustment module includes a stepping motor and a gear;

[0011] The stepper motor is connected to the gear, and the front Fresnel mirror is meshed with the gear; the stepper motor is used to output the adjustment steps and drive the front Fresnel mirror to rotate via the gear.

[0012] Optionally, the projector optical machine further includes a gravity sensor located on the top of the housing, and the gravity sensor is connected to the stepper motor.

[0013] The gravity sensor is used to detect the elevation angle of the projector optical machine in real time and output elevation angle feedback information to the stepper motor.

[0014] Optionally, the projector optical machine further includes a plane reflector located between the front Fresnel mirror and the projection lens group, and the plane reflector is used to reflect the converged image light emitted by the front Fresnel mirror and emit it to the projection lens group.

[0015] Optionally, the projector optical engine further includes a radiator, and the radiator is used for internally dissipating heat of the projector optical engine.

[0016] Optionally, the projector optical machine further includes a cooling fan, the cooling fan includes an air inlet fan and an air outlet fan, the air outlet of the radiator is arranged adjacent to the air outlet fan, and the air inlet fan and the air outlet fan dissipate heat for the radiator.

[0017] Optionally, the light source includes an LED light source; and the display module includes a liquid crystal display screen.

[0018] In a second aspect, the present invention provides a projector, comprising the projector optical machine described in any one of the first aspects.

[0019] The technical solution of the embodiment of the present invention provides a projector optical machine including a shell, and a light source, a display module, a front Fresnel mirror and a projection lens group located in the shell and arranged in sequence from the light source end to the projection screen; the light emitted by the light source is incident on the display module, the image light emitted by the display module is incident on the front Fresnel mirror, the front Fresnel mirror emits the image light after convergence, and the projection lens group projects the converged image light onto the projection screen to form a display image; the projector optical machine also includes an angle adjustment module, the angle adjustment module is connected to the front Fresnel mirror, and the angle adjustment module is used to drive the front Fresnel mirror to rotate; the projector optical machine has an initial elevation angle, and the rotation direction of the front Fresnel mirror is the same as the direction of the initial elevation angle. By driving the front Fresnel mirror to rotate, the picture gradient change brought about by its rotation is opposite to the picture gradient change brought about by the initial elevation angle of the projector optical machine, so as to realize automatic adjustment of the trapezoidal change of the picture, form a rectangular picture, and ensure the projection effect.

[0020] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the structure of a projector optical machine provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the structure of another projector optical machine provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] Figure 1 A schematic diagram of the structure of a projector optical machine provided by an embodiment of the present invention, Figure 2 A schematic diagram of the structure of another projector optical machine provided by an embodiment of the present invention is shown in FIG. Figure 1 and Figure 2As shown, the projector optical machine 100 includes a shell, and a light source 101, a display module 102, a front Fresnel mirror 103 and a projection lens group 104 located in the shell and arranged in sequence from the light source 101 end to the projection screen; the light emitted by the light source 101 is incident on the display module 102, the image light emitted by the display module 102 is incident on the front Fresnel mirror 103, the front Fresnel mirror 103 emits the image light after convergence, and the projection lens group 104 projects the converged image light onto the projection screen to form a display image; the projector optical machine 100 also includes an angle adjustment module 105, the angle adjustment module 105 is connected to the front Fresnel mirror 103, and the angle adjustment module 105 is used to drive the front Fresnel mirror 103 to rotate; the projector optical machine 100 has an initial elevation angle, and the rotation direction of the front Fresnel mirror 103 is the same as the direction of the initial elevation angle.

[0027] Among them, the projector optical machine 100 includes at least a light source 101, a display module 102, a front Fresnel mirror 103 and a projection lens group 104 arranged in sequence along the optical path. A filter and a light adjustment unit can also be arranged between the light source 101 and the display module 102. The filter can filter out invisible light such as infrared and ultraviolet rays to avoid damage to the liquid crystal panel; the light adjustment unit can correct the light emitted by the light source 101, and correct the conical light into a light that is close to a rectangle, thereby improving the utilization rate. The light emitted by the light source 101 is filtered by the filter, and after being corrected by the light adjustment unit, it is incident on the display module 102. After passing through the display module 102, the light can emit a colored image light, and the image light is incident on the front Fresnel mirror 103. After the front Fresnel mirror 103 converges the parallel image light, it is incident on the projection lens group 104. The projection lens group 104 amplifies the converged image light and projects it to the projection screen to form a display image. In order to realize the projector optical machine 100 with the off-axis function, an initial elevation angle is given to the projector optical machine 100. Correspondingly, the front Fresnel mirror 103 in the projector optical machine 100 has an initial elevation angle relative to the base plane and the projection lens group 104 has an initial elevation angle relative to the base plane. The base plane can be the ground plane or the plane where the projector optical machine 100 is placed. In order to ensure that a rectangular image is formed in the final projection screen, the projector optical machine 100 is also provided with an angle adjustment module 105. The angle adjustment module 105 is connected to the front Fresnel mirror 103. The angle adjustment module 105 drives the front Fresnel mirror 103 to rotate, and drives the front Fresnel mirror 103 to rotate in the direction of the same initial elevation angle. The direction of the initial elevation angle is usually the upward direction relative to the base plane. After the front Fresnel mirror 103 rotates, the display image will undergo a trapezoidal change to offset the display image change in the opposite direction caused by the initial elevation angle, thereby realizing automatic trapezoidal correction, so that the final display image becomes a regular rectangle, and there is no pixel cropping, the display image resolution and clarity are retained, the display image brightness is retained, and automatic lossless trapezoidal image correction can be realized.

[0028] For example, when the initial elevation angle θ 1 The angle adjustment module 105 drives the front Fresnel mirror 103 to rotate upward by 5°. At this time, the angle θ between the front Fresnel mirror 103 and the base surface is 2 is 10°. According to the initial elevation angle θ 1 , the front Fresnel mirror 103 is driven to rotate by the angle adjustment module 105, so that a correct rectangular image can be obtained according to the use scenarios of different elevation angles of the projector optical machine 100, and the function of automatically adjusting the trapezoidal change of the image is realized, thereby ensuring the flexibility of the application scenarios. The initial elevation angle can be selected according to actual design requirements, and the embodiment of the present invention does not make specific limitations.

[0029] The projector optical machine provided by the embodiment of the present invention includes a light source, a display module, a front Fresnel mirror and a projection lens group; the projector optical machine also includes an angle adjustment module, the angle adjustment module is connected to the front Fresnel mirror, and the angle adjustment module drives the front Fresnel mirror to rotate; the projector optical machine has an initial elevation angle, and the rotation direction of the front Fresnel mirror is the same as the direction of the initial elevation angle. By driving the front Fresnel mirror to rotate, the picture gradient change brought about by its rotation is opposite to the picture gradient change brought about by the initial elevation angle of the projector optical machine, thereby realizing automatic adjustment of the trapezoidal change of the picture, forming a rectangular picture, and ensuring the projection effect.

[0030] Optionally, the initial elevation angle θ of the projector optical engine 100 is 1 The rotation angle is equal to that of the front Fresnel mirror 103 .

[0031] The rotation angle of the front Fresnel mirror 103 is determined according to the initial elevation angle θ of the projector optical machine. 1 The angle adjustment module 105 drives the front Fresnel mirror 103 to rotate so that the rotation angle of the front Fresnel mirror 103 is equal to the initial elevation angle θ of the projector optical machine 100. 1 equal to the initial elevation angle θ of the projector optical machine 100, thereby ensuring that the trapezoidal change of the display image brought about by the rotation of the front Fresnel mirror 103 is equal to the initial elevation angle θ of the projector optical machine 100. 1 The trapezoidal changes in the displayed image are in opposite directions, and the two cancel each other out, forming a correct rectangular image on the projected display screen, ensuring the trapezoidal correction effect and no pixel loss or brightness loss in the displayed image.

[0032] Optionally, the initial elevation angle θ of the projector optical engine 100 is 1 is 5°.

[0033] The initial elevation angle θ of the projector optical machine 100 is 1When the angle adjustment module 105 drives the front Fresnel mirror 103 to rotate upward at an angle of 5°, the angle between the front Fresnel mirror 103 and the base surface is 10°, and the 48% off-axis of the projector optical machine 100 is achieved. After the angle adjustment module 105 drives the front Fresnel mirror 103 to rotate and adjust, the rotation angle of the front Fresnel mirror 103 is equal to the initial elevation angle θ of the projector optical machine 100. 1 equal to the initial elevation angle θ of the projector optical machine 100, so that the trapezoidal change of the display image caused by the rotation of the front Fresnel mirror 103 is equal to the initial elevation angle θ of the projector optical machine 100. 1 The trapezoidal changes in the displayed image are in opposite directions, and the two cancel each other out, forming a correct rectangular image on the display screen, ensuring the trapezoidal correction effect and no pixel loss and brightness loss in the displayed image. In addition, the initial elevation angle θ of the projector optical machine 100 can also be 1 Dynamic adjustment is performed to meet the design requirements, and the rotation angle of the front Fresnel mirror 103 is adjusted accordingly to achieve different off-axis values. Table 1 shows the projector off-axis values ​​corresponding to different initial elevation angles when the projection ratio is 1.5.

[0034] Table 1

[0035] Throw Ratio 1.5 1.5 1.5 1.5 1.5 1.5 Initial elevation angle (°) 5 6 7 8 9 10 Projector off-axis (%) 48％ 57％ 66％ 76％ 85％ 94％

[0036] Optionally, the angle adjustment module 105 includes a stepper motor 1051 and a gear 1052 ; the stepper motor 1051 is connected to the gear 1052 , and the front Fresnel mirror 103 is meshed with the gear 1052 ; the stepper motor 1051 is used to output the adjustment step number, and drives the front Fresnel mirror 103 to rotate via the gear 1052 .

[0037] Specifically, the angle adjustment module 105 can include a stepper motor 1051 and a gear 1052. The stepper motor 1051 drives the front Fresnel mirror 103 to rotate via the gear 1052. The front Fresnel mirror 103 is meshed with the gear 1052. The stepper motor 1051 outputs corresponding adjustment steps, and then drives the front Fresnel mirror 103 to rotate via the gear 1052. The rotation angle of the front Fresnel mirror 103 is achieved by correspondingly realizing different output adjustment steps. The correspondence between the adjustment steps output by the stepper motor 1051 and the rotation angle of the front Fresnel mirror 103 can be preset and stored in advance to achieve the adjustment accuracy of the stepper motor 1051.

[0038] Optionally, the projector optical engine 100 also includes a gravity sensor 105 located on the top of the shell, and the gravity sensor 105 is connected to the stepper motor 1051; the gravity sensor 105 is used to detect the elevation angle of the projector optical engine 100 in real time, and output elevation angle feedback information to the stepper motor 1051.

[0039] The projector optical engine 100 further includes a gravity sensor 105 located at the top of the housing. The gravity sensor 105 is generally integrated on the main board PCB. The gravity sensor 105 works based on the principle of piezoelectric effect. The gravity sensor 105 is a cantilever displacement device made of elastic sensitive elements, and drives the electrical contacts with an energy storage spring made of elastic sensitive elements to complete the conversion from gravity changes to electrical signals. The gravity sensor 105 is connected to the stepper motor 1051; the gravity sensor 105 detects the elevation angle of the projector optical machine 100 in real time, that is, detects the elevation angle of the projector optical machine 100 in real time, avoids the initial elevation angle of the projector optical machine 100 from changing, and ensures the trapezoidal correction accuracy of the displayed image. The gravity sensor 105 outputs the elevation angle feedback information to the stepper motor 1051 in real time, and then the stepper motor 1051 outputs the adjustment step number according to the change of the elevation angle of the projector optical machine 100, and drives the front Fresnel mirror 103 to rotate through the gear 1052, so that the image gradient change brought about by the rotation of the front Fresnel mirror 103 is opposite to the image gradient change brought about by the initial elevation angle of the projector optical machine 100, realizes the automatic adjustment of the trapezoidal change of the image, forms a rectangular image, and ensures the projection effect.

[0040] Optionally, the projector optical engine 100 further includes a plane reflector 106 located between the front Fresnel mirror 103 and the projection lens group 104 , and the plane reflector 106 is used to reflect the converged image light emitted by the front Fresnel mirror 103 and emit it to the projection lens group 104 .

[0041] Among them, a plane reflector 106 is also provided in the projector optical machine 100. The plane reflector 106 is arranged between the front Fresnel mirror 103 and the projection lens group 104. The plane reflector 106 reflects the converged image light emitted by the front Fresnel mirror 103 and emits it to the projection lens group 104. The plane reflector 106 can adjust the optical path, reduce the overall volume of the projector optical machine 100, and reduce space occupancy.

[0042] Optionally, the projector optical engine 100 further includes a heat sink 107 , and the heat sink 107 is used to perform internal heat dissipation for the projector optical engine 100 .

[0043] Among them, the projector optical machine also includes a radiator 107, which is arranged adjacent to the light source 101. The light emitted by the light source 101 is the main heat source inside the projector optical machine 100. The radiator 107 may include a liquid-cooled radiator or an auxiliary heat-conducting sheet to achieve effective cooling and heat dissipation, thereby achieving internal heat dissipation of the projector optical machine 100 with the help of the radiator 107.

[0044] Optionally, the projector optical machine 100 further includes a cooling fan 108 , the cooling fan 108 includes an air inlet fan 1081 and an air outlet fan 1082 , the air outlet of the radiator 107 is arranged adjacent to the air outlet fan 1082 , and the air inlet fan 1081 and the air outlet fan 1082 dissipate heat for the radiator 107 .

[0045] Among them, the projector optical engine 100 is also provided with a cooling fan 108 located inside the shell, and the cooling fan 108 includes an air inlet fan 1081 and an air outlet fan 1082 arranged at intervals. The air inlet fan 1081 and the air outlet fan 1082 are located on the same side of the shell, the air inlet fan 1081 is arranged on the upper side of the shell and the air outlet fan 1082 is arranged on the lower side of the shell, and the air outlet fan 1082 is arranged adjacent to the air outlet of the radiator 107, so that the air inlet fan 1081 and the air outlet fan 1082 dissipate the heat generated by the radiator 107 through air circulation, thereby ensuring the working performance of the projector optical engine 100.

[0046] Optionally, the light source 101 includes an LED light source 101; and the display module 102 includes a liquid crystal display screen.

[0047] Wherein, the light source 101 may be an LED light source, and the display module 102 may be a liquid crystal display screen. The LED light source 101 may be used as a backlight light source to provide light for the display module 102, and then, by means of the photoelectric effect of the liquid crystal, the liquid crystal molecules in the liquid crystal display screen are controlled to rotate under the action of the electric field, thereby affecting the light transmittance of the liquid crystal display screen and allowing the light to be output through the liquid crystal display screen. Exemplarily, the display module 102 may include three liquid crystal display screens of different colors, specifically a red liquid crystal display screen, a green liquid crystal display screen, and a blue liquid crystal display screen. The white light emitted by the LED light source generates red light information in the image through the red liquid crystal display screen, the white light emitted by the LED light source generates green light information in the image through the green liquid crystal display screen, and the white light emitted by the LED light source generates blue light information in the image through the blue liquid crystal display screen, thereby mixing the three colors of light to form a color image, so as to form a display image on the projection screen.

[0048] Based on the same inventive concept, an embodiment of the present invention further provides a projector, which includes the technical features of the projector optical engine 100 provided in any embodiment of the present invention, and can achieve the beneficial effects of the projector optical engine 100 provided in any embodiment of the present invention. The similarities can be referred to the above description of the projector optical engine 100 provided in the embodiment of the present invention, and will not be repeated here.

[0049] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A projector optical machine, characterized in that: It comprises a shell, and a light source, a display module, a front Fresnel mirror and a projection lens group which are located in the shell and arranged in sequence from the light source end to the projection screen; The light emitted by the light source is incident on the display module, the image light emitted by the display module is incident on the front Fresnel mirror, the front Fresnel mirror emits the image light after convergence, and the projection lens group projects the converged image light onto the projection screen to form a display image; The projector optical machine further includes an angle adjustment module, which is connected to the front Fresnel mirror and is used to drive the front Fresnel mirror to rotate; The projector optical machine has an initial elevation angle, and the rotation direction of the front Fresnel mirror is the same as the direction of the initial elevation angle.

2. The projector optical machine according to claim 1, characterized in that: The initial elevation angle of the projector optical machine is equal to the rotation angle of the front Fresnel mirror.

3. The projector optical machine according to claim 1, characterized in that: The initial elevation angle of the projector optical machine is 5°.

4. The projector optical machine according to claim 1, characterized in that: The angle adjustment module includes a stepping motor and a gear; The stepper motor is connected to the gear, and the front Fresnel mirror is meshed with the gear; the stepper motor is used to output the adjustment steps and drive the front Fresnel mirror to rotate via the gear.

5. The projector optical machine according to claim 4, characterized in that: The projector optical machine also includes a gravity sensor located on the top of the housing, and the gravity sensor is connected to the stepper motor; The gravity sensor is used to detect the elevation angle of the projector optical machine in real time and output elevation angle feedback information to the stepper motor.

6. The projector optical machine according to claim 1, characterized in that: The projector optical machine also includes a plane reflector located between the front Fresnel mirror and the projection lens group, and the plane reflector is used to reflect the converged image light emitted by the front Fresnel mirror and emit it to the projection lens group.

7. The projector optical machine according to claim 1, characterized in that: The projector optical engine also includes a radiator, which is used for internally dissipating heat of the projector optical engine.

8. The projector optical machine according to claim 7, characterized in that: The projector optical machine also includes a heat dissipation fan, which includes an air inlet fan and an air outlet fan. The air outlet of the radiator is arranged adjacent to the air outlet fan, and the air inlet fan and the air outlet fan dissipate heat for the radiator.

9. The projector optical machine according to claim 1, characterized in that: The light source includes an LED light source; the display module includes a liquid crystal display screen.

10. A projector, characterized in that: A projector optical machine comprising any one of claims 1-9.

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