WO2020078187A1

WO2020078187A1 - Projector

Info

Publication number: WO2020078187A1
Application number: PCT/CN2019/107999
Authority: WO
Inventors: 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2018-10-19
Filing date: 2019-09-26
Publication date: 2020-04-23
Also published as: CN111077718A

Abstract

Provided is a projector, including a housing (120) and an optical machine (110), wherein a correction device (130) is arranged inside the housing (120), and the correction device (130) is used for changing a projection direction of an image projected by the optical machine (110) without changing the position of the housing (120). By means of arranging the correction device (130) inside the housing (120) of the projector, the projector can change the projection direction of the image projected by the optical machine (110) without moving the housing (120). Compared with the prior art, the correction device consumes less energy when working, and the projector can be prevented from undergoing collision during movement.

Description

Projector

Technical field

The invention relates to a projector, which belongs to the technical field of manufacturing of projection equipment.

Background technique

The projector forms an image by projecting the emitted light onto the screen, so the positional relationship between the projector and the screen directly affects the quality of the projected image. Generally, since the display chips are all rectangles with preset aspect ratios, it is expected that the image projected on the screen is also a rectangle that satisfies the same aspect ratio. However, since it is difficult to manually place the projector accurately, it is usually necessary to correct the position of the projector after turning it on.

In the prior art, the adjustment mechanism is generally used to correct the position of the projector. The adjustment mechanism may be provided with a plurality of feet provided at the bottom of the projector, which adjusts the position of the projector by changing the length of the feet; the adjustment mechanism may also be a rotating bracket provided on the projector or a three-dimensional adjustable tripod.

During the calibration process, the above solution needs to move the position of the entire projector. Due to the large mass of the projector and the large load of the adjustment mechanism, it consumes more energy and increases the mechanical wear of the adjustment mechanism, affecting its use. Life; In addition, the whole projector may collide during movement, causing unnecessary damage.

With the development of electronic control technology and processors, a technology for electronic correction based on images has appeared on the market, such as trapezoidal correction of images by changing the projection pixels. However, this technology has defects such as reduced light utilization and light leakage. The corrected area is prone to dark area projection, and the display effect is poor.

Summary of the invention

The technical problem to be solved by the present invention is to provide a projector in response to the shortcomings of the prior art. By providing a correction device in the projector housing, the projector can change the projection direction of the image projected by the optical machine without moving the housing Compared with the prior art, the energy consumption of the correction device during operation is smaller, and it can prevent the projector from colliding during the movement.

The technical problem to be solved by the present invention is achieved by the following technical solutions:

The projector of the present invention includes a housing and an optical machine. The housing is provided with a correction device. The correction device is used to change the projection direction of the image projected by the optical machine without changing the position of the housing.

Specifically, the optical machine includes:

Light source module for emitting light from the light source to the light guide module;

A light guide module, used to guide the light source to the light modulation module;

The light modulation module includes a light modulator and a projection lens, and is used to receive the light source light guided by the light guide module, modulate it into image light, and project it to the display device.

In order to change the projection direction of the projected image, the correction device includes a driver for driving the optical machine to change the projection direction so that the optical axis of the image light is tilted.

Preferably, the light source module, the light guide module and the light modulation module are fixedly connected, and the driver is fixed on the housing and drives the light source module, the light guide module and the light modulation module to move integrally.

In order to further miniaturize the projector and reduce the load on the correction device, the light source module and the housing are fixedly connected, the light guide module and the light modulation module are fixedly connected, and the driver is fixed on the light source module or the housing and drives The light modulation module or drives the light modulation module and the light guide module to move relative to the light source module.

In order to prevent the projector from reaching the adjustment boundary after undergoing adjustment and causing no adjustment space for the next calibration, the projector also includes an automatic reset module, which is used to adjust the projector's optical machine to the initial position .

In order to ensure the sealing, an opening provided around the projection lens is formed on the casing, the opening is in the shape of a trumpet, and the opening and the projection lens are connected by a retractable rubber.

In order to limit the rotation angle of the optical machine, a plurality of limit posts for limiting the rotation angle of the optical machine are provided in the housing.

In order to keep the projected image of the projector horizontal, the projector includes a gravity detection module electrically connected to the correction device, and the gravity detection module is used to receive or generate a gravity signal.

Preferably, the driver may also rotate the optical axis of the image light or move the image light forward and backward along the optical axis direction.

In summary, in the present invention, by installing a correction device in the projector housing, the projector can change the projection direction of the image projected by the optical machine when the housing is not moving. Compared with the prior art, the correction device consumes The energy source is small, and can prevent the projector from colliding while moving.

The technical solution of the present invention will be described in detail below with reference to the drawings and specific embodiments.

BRIEF DESCRIPTION

FIG. 1 is a schematic structural diagram of a projector of the present invention;

2 is a schematic structural view of the optical machine of the present invention;

FIG. 3 is a schematic diagram of the light guide module and the light modulation module after rotating in an embodiment of the present invention.

detailed description

FIG. 1 is a schematic structural diagram of a projector of the present invention, and FIG. 2 is a schematic structural diagram of an optical machine of the present invention. As shown in FIGS. 1 and 2, the present invention provides a projector. The projector includes a housing 120, an optical machine 110 and a correction device 130.

The optical machine 110 is used to generate a projection image and project the projection image to a display device.

The housing 120 is used for accommodating and protecting the optical machine 110, for example, it has the functions of dust prevention and loading.

The correction device 130 is disposed in the housing 120 and is used to change the position of the optical machine 110 without changing the position of the housing 120, thereby changing the projection direction of the image projected by the optical machine 110.

The optical machine 110 includes a light source module 01, a light guide module 03 and a light modulation module 02.

The light source module 01 is used to emit light from the light source to the light guide module 03. The light source light is usually a uniform rectangular light spot, of course, it can also be a circular light spot and other shapes. The light source module 01 may be various types of light source modules.

The light source module 01 may include a light bulb light source, a uniform light device, and a light spot shaping device. The light source of the light bulb is a known halogen lamp, xenon lamp, etc. The light source module 01 may directly emit white light, or may form a time series of RGB or through the filter light wheel. RGBW, a uniform light device is used to homogenize the light emitted by the light source of the light bulb, and the light spot shaping device makes the light spot at the exit end of the light source module 01 matched to the light spot corresponding to the light modulation module 02.

The light source module 01 may further include an LED light source, a uniform light device and a spot shaping device, wherein the LED light source is an RGB three-color LED light source, each color LED light source may include multiple LEDs, and various color LED light sources pass the wavelength combination Light. The LED light source can be an HLD (High Lumen Density) light source, that is, multiple LEDs are integrated into a high-brightness light source through a light collecting rod.

The light source module 01 may further include a laser phosphor light source (ALPD, Advanced Laser Display Light source) and a light collecting device, and the laser phosphor powder light source includes a blue laser light source and a fluorescent color wheel.

The light source module 01 may further include a pure laser RGB light source and a speckle-reducing element. The speckle-removing element is a scattering sheet or an optical element vibration device.

The light guide module 03 may include a mirror and other elements, which are used to guide the light source light emitted by the light source module 01 to the light modulation module 02.

The light modulation module 02 includes a light modulator and a projection lens 111 for receiving light source light from the light source module 01 guided by the light guide module 03 and modulating the light source light into image light and projecting it to the display device. Specifically, the light source The light source light emitted by the module 01 (such as a rectangular light spot, which will be described below as a rectangular light spot) is guided to the light modulator by the light guide module 03, and after being modulated by the light modulator, generates an image light spot, which is passed through the projection lens 111 Projection imaging onto a display device (such as a screen outside the projector) to form a projected image.

The light modulator may be an LCD light modulator, an LCoS light modulator, a DMD light modulator, or a MEMS scanning light modulator, wherein the LCD light modulator and the LCoS light modulator require the light source to be a polarized light source, and the MEMS scanning light modulation The light source needs to be a laser light source or a small divergence angle light source.

The correction device 130 includes a driver for driving the optical machine 110 to change the projection direction so that the optical axis of the image light (that is, the optical axis of the projection lens 111) is tilted. Further, the driver can also rotate the optical axis of the image light or move the image light forward and backward along the optical axis direction. Specifically, through the drive control of the correction device 130, the light modulation module 02 of the optical machine 110 is driven to be displaced, thereby changing the projection direction of the projected image. The correction device 130 may be composed of existing stepping motors, gears, and the like. For example, the correction device 130 may be an adjustment device for an adaptive (Front-Lighting) system headlight in an automobile of the prior art, and it may also be another mechanical structure for adjusting position and angle. The adjustment device It is the prior art and will not be repeated here. For example, the components that need to be adjusted in the present invention (such as the light modulation module 02) can be set at the position of the original car light module, so that the angle of the light emitted by the adjustment device can be adjusted. The correction device 130 includes a horizontal adjustment device and a vertical adjustment device. The horizontal adjustment device and the vertical adjustment device may be two independent adjustment members or an integrated two-dimensional adjustment device.

The correction device 130 can also be other types of drivers, for example, it can be adjusted by a stepping motor through a column, or can also be adjusted by a gear transmission. The correction device 130 may also include various auxiliary structures.

For example, when the optical machine 110 is required to rotate in the horizontal direction, a shaft column may be provided at the bottom / top / side of the housing 120 close to the projection lens 111, and a through hole or pit may be provided at the corresponding position of the optical machine base or structural frame, so The shaft column passes through the through hole or pit, and the optomechanical base or the structural frame can rotate around the shaft column, thereby driving the optical machine 110 to rotate.

In order to limit the rotation angle of the optical machine 110, a plurality of limit posts are provided in the housing 120 of the projector to prevent the optical machine 110 from rotating beyond the range.

In order to avoid overloading a single shaft column, a groove or a convex section can also be provided on the base or structural frame of the optical machine 110, and a corresponding convex section or a groove can be provided on the projector housing 120 to make the light The machine 110 is able to rotate in a slide rail composed of grooves.

In order to improve the adjustment accuracy and prevent the optical machine 110 from moving back and forth during the rotation, the movement of the optical machine 110 may be restricted by a spring member or a friction resistance member. Specifically, the base or structural frame of the optomechanical machine can be connected to the two fixed columns through two springs. When rotating in one direction, one spring compresses the other spring and vice versa; or, A high-damping ferrule is set in the middle to increase the frictional resistance of the optical machine 110 moving.

The above describes the situation when the optical machine 110 rotates in the horizontal direction, and corresponds to the projected image, that is, horizontal keystone correction.

When the optical machine 110 needs to rotate along the optical axis of the image light, the side wall of the optical machine base or the structural frame immediately outside the projection lens 111 can be set as a cylindrical surface, and a circular cylindrical shape is provided on the housing 120 close to the cylindrical surface The groove body, so that the cylindrical surface is accommodated in the groove body. At this time, the correction device 130 may further include a retractable upright post, which is disposed on the side of the optical machine base or structural frame away from the projection lens 111, and the retractable upright post enables the optical machine to rotate around the optical axis of the projection lens 111 .

For the case where the pitch angle of the projected image needs to be adjusted, the above two adjustment methods can be referred to, the principle is the same, and both are rotated around one axis.

The correction device 130 may be set to manual adjustment or automatic adjustment. For example, when manual adjustment is used, the user can manipulate the correction device 130 by pressing or toggling buttons, knobs, gears, etc. outside the projector housing 120, or control the driver (such as a motor) on the correction device through the remote control To adjust the movement of the correction device. When using automatic adjustment, you can use the built-in program, use the camera to shoot the image and then adjust.

In order to ensure that the correction device 130 can drive the light modulation module 02 to move, a space for the light modulation module 02 to move needs to be provided in the housing 120. Taking a projector with a length of 20 cm as an example, when the projection lens 111 rotates ± 5 ° in a certain direction, it means that the light modulation module 02 moves 20 cm × sin5 ° ≈1.74 cm in that direction. If the projection distance of the projector If it is 3m, the projection lens 111 rotated by ± 5 ° can make the screen deviate from the distance of 3m × tan5 ° ≈26cm, and when the user manually places the projector, it generally does not make the center of the screen deviate as far as 26cm, that is, through the housing 120 Less than 2cm of space can be used to meet the calibration needs of ordinary users. In other words, preferably, considering the internal space of the projector, it is recommended that the adjustment range be within ± 5 °, so that the optical machine has at most ± 1.74 cm of moving space.

In an embodiment of the present invention, the light source module 01, the light guide module 03, and the light modulation module 02 are relatively stationary, for example, a fixed structure is provided to form an integrated structure, that is, the light source module 01, the light guide module 03, and the light modulation module 02 The relative position is unchanged. At this time, the driver of the correction device 130 is fixed on the housing 120. When the correction device 130 is in operation, the driver drives the optical machine 110 to move relative to the housing 120, thereby changing the position of the projection lens 111. Based on the change, the position of the projection light on the screen can be adjusted to obtain a better rectangular projection effect.

In another embodiment of the present invention, the light source module 01 and the housing 120 are fixedly connected, and the light guide module 03 and the light modulation module 02 are fixedly connected, that is, the relative position of the light source module 01 and the housing 120 is unchanged, and the light The relative position of the guide module 03 and the light modulation module 02 remains unchanged, and the latter can move relative to the former. FIG. 3 is a schematic diagram of the light guide module and the light modulation module after rotating in an embodiment of the present invention. As shown in FIG. 3, at this time, the driver of the correction device 130 is fixed on the housing 120. When the correction device 130 works, it drives the light guide module 03 and the light modulation module 02 to move relative to the housing 120, or drives the light modulation module 02 moves relative to the housing 120, thereby changing the position of the projection lens 111. On the basis that the positions of the projector housing and the light source module 01 are not changed, the position of the projection light on the screen is adjusted to obtain a better rectangular projection effect. In view of the characteristics of light reflection, in this embodiment, as shown in FIG. 3, in order to ensure that the direction of the main optical axis of the light source light incident on the light modulation module 02 does not change and the optical path does not change, when the light guide module 03 is in a certain position When the direction rotation angle is β, the rotation angle of the light modulation module 02 is α, where α = 2β. For the case of α = 2β in this embodiment, the light modulation module 02 and the light guide module 03 can be linked by using a gear with a radius of 1: 2, and the connection between different parts of each other can be realized by a circular arc combination. The present invention is not limited to this, and those skilled in the art can adjust it according to the actual optical path inside the projector.

In this embodiment, since the light source module 01 does not move, only the positions of the light guide module 03 and the light modulation module 02 change, or only the positions of the light modulation module 02 change, and the number of components requiring movement is reduced. The space for the movement of the optical machine 110 can be further reduced, thereby facilitating the miniaturization design of the projector, and the weight load of the correction device 130 is reduced, and its energy consumption and mechanical wear are reduced.

In order to prevent the projector from reaching the adjustment boundary after adjustment, resulting in the phenomenon that there is no adjustment space for the next calibration, the projector also includes an automatic reset module, which is used to adjust the light modulation module 02 of the projector to initial position. Specifically, the user can start the automatic reset module when needed, so that the light modulation module 02 returns to the initial position, and then fix the position of the projector, so that the projection image of the projector may still be adjusted.

In order to keep the projected image of the projector horizontal, the projector further includes a gravity detection module electrically connected to the correction device 130, and the gravity detection module can receive or generate a gravity signal. Specifically, the gravity detection module includes a gravity sensor, or the gravity detection module includes a gravity signal receiver, and the gravity signal receiver is used to receive signals from other devices (such as mobile phones) with a gravity sensor, for example Put the mobile phone with gravity sensor on the surface of the projector to keep the two level. Since the two have the same posture, the signal sent by the gravity sensor in the mobile phone can be applied to the projector.

During the adjustment process, due to the movement of the projection lens of the light modulation module, the housing may block the projected image from the projection lens, or a gap between the housing and the projection lens may affect its sealing performance. The opening is trumpet-shaped, and the opening and the projection lens are connected by a retractable rubber.

In the present invention, by providing a correction device in the projector housing, the projector can change the projection direction of the image projected by the optical machine when the housing is not moving. Compared with the prior art, the correction device consumes less energy during operation, and It can prevent the projector from colliding while moving.

Claims

A projector includes a housing and an optical machine, wherein the housing is provided with a correction device, and the correction device is used to change the projection direction of the image projected by the optical machine without changing the position of the housing.
The projector according to claim 1, wherein the optical machine comprises:

Light source module for emitting light from the light source to the light guide module;

A light guide module, used to guide the light source to the light modulation module;

The light modulation module includes a light modulator and a projection lens, and is used to receive the light source light guided by the light guide module, modulate it into image light, and project it to the display device.
The projector according to claim 2, wherein the correction device includes a driver for driving the optical machine to change the projection direction so that the optical axis of the image light is tilted.
The projector according to claim 3, wherein the light source module, the light guide module and the light modulation module are fixedly connected, and the driver is fixed on the housing and drives the light source module, the light guide module and the light modulation module as a whole mobile.
The projector according to claim 3, wherein the light source module and the housing are fixedly connected, the light guide module and the light modulation module are fixedly connected, and the driver is fixed on the light source module or the housing, and Drive the light modulation module or drive the light modulation module and the light guide module to move relative to the light source module.
The projector according to claim 2, wherein the projector further comprises an automatic reset module, the automatic reset module is used to adjust the optical machine of the projector to an initial position.
The projector according to claim 2, wherein an opening provided around the projection lens is formed in the housing, the opening is in a trumpet shape, and the opening and the projection lens are connected by a retractable rubber.
The projector according to claim 1, wherein a plurality of limit posts for limiting the rotation angle of the optical machine are provided in the housing.
The projector according to claim 1, wherein the projector includes a gravity detection module electrically connected to the correction device, and the gravity detection module is used to receive or generate a gravity signal.
The projector according to claim 3, wherein the driver can further rotate the optical axis of the image light or move the image light forward and backward in the optical axis direction.