CN117221500A

CN117221500A - Projection apparatus and projection display method

Info

Publication number: CN117221500A
Application number: CN202310987182.5A
Authority: CN
Inventors: 朱小龙; 尹蕾; 聂思永
Original assignee: Yibin Jimi Photoelectric Co Ltd
Current assignee: Yibin Jimi Photoelectric Co Ltd
Priority date: 2023-08-07
Filing date: 2023-08-07
Publication date: 2023-12-12

Abstract

The invention discloses projection equipment and a projection display method, and relates to the technical field of display. According to the invention, the light spot adjusting device is arranged in the illumination system of the projection equipment, the working pixel area of the display chip is determined according to the target projection picture, and then the light spot adjusting device is adjusted according to the working pixel area of the display chip, so that the formed light spots irradiated on the display chip cover the working pixel area of the display chip, the shape of the formed light spots is the same as that of the working pixel area of the display chip, the projection picture with a specific shape and/or size can be projected according to the requirement, and further, the gray edges of the projection picture can be eliminated or reduced.

Description

Projection apparatus and projection display method

Technical Field

The present invention relates to the field of display technologies, and in particular, to a projection device and a projection display method.

Background

Currently, projectors are widely used in a variety of contexts, such as office briefs, playing movies, device art, and the like. Most projectors are based on spatial light modulators (SLM, spatial Light Modulator), which mainly include transmissive LCD (Liquid Crystal Display, liquid crystal) projection, reflective LCoS (Liquid Crystal on Silicon ) projection, and reflective DMD (Digital Micro-Mirror Device) projection. In different application scenes, projection pictures with different shapes and/or sizes may need to be formed, for example, when the projector is used for projecting the jittering audio and video played by the intelligent terminal, the projection pictures are long and narrow rectangles, and when scenes such as family photo album and the like are played, projection pictures with round or pentagonal shapes and the like can be formed so as to improve interestingness.

Meanwhile, the projector is used as an intelligent portable display device, can be placed at will according to the requirements of a user, and when the projector is placed to be sideways or is placed with an inclined angle, a projection picture can be inclined. At this time, a trapezoidal correction technique may be introduced to correct the projection screen, so that the projection screen presents a regular rectangular projection. However, after the trapezoid correction, the edges of the picture will usually have a circle of gray edges, which affects the viewing experience.

Disclosure of Invention

The invention provides a projection device and a projection display method, which can project a projection picture with a specific shape and/or size according to the requirement, and further can eliminate or reduce the gray edges of the projection picture.

In a first aspect, the present invention provides a projection apparatus comprising:

a light source device for generating illumination light;

the light homogenizing element is used for homogenizing the illumination light generated by the light source device and forming an original light spot on the emergent surface of the light homogenizing element;

the illumination system is used for imaging the original light spots on the display chip at a first magnification when the original light spots are not adjusted by the light spot adjusting device;

a display chip for modulating the illumination light into image light;

the light spot adjusting device is positioned on the emergent surface of the light homogenizing element or the relay image surface of the lighting system and is used for adjusting the effective light spot area of the original light spot, so that the light spot formed on the display chip covers the working pixel area of the display chip, and the shape of the light spot formed is the same as that of the working pixel area of the display chip.

In a possible implementation manner, a distance between a surface of the light spot adjusting device, which is close to the light homogenizing element, and an emergent surface of the light homogenizing element is 0-5mm.

In a possible implementation manner, the method further includes:

and the fixing device is used for fixing the dodging element and the light spot adjusting device so that the relative positions of the dodging element and the light spot adjusting device are kept unchanged.

In a possible implementation, the light homogenizing element comprises a light bar, and the light spot adjusting device comprises one or more blocking pieces, and the one or more blocking pieces can rotate and/or move and/or swing.

In a possible implementation manner, the dodging element includes a compound eye, and the compound eye includes a plurality of lens units; the light spot adjusting device comprises a liquid crystal panel, the liquid crystal panel comprises a plurality of pixel units, the pixel units are in one-to-one correspondence with the lens units, and a plurality of pixels in each pixel unit can be opened or closed.

In a possible implementation manner, the one or more baffles are connected with the optical machine housing of the projection device through a heat dissipation medium, or the one or more baffles are connected with a heat dissipation device.

In a possible implementation manner, the method further includes:

And the control module is used for determining the working pixel area of the display chip according to the target projection picture and adjusting the light spot adjusting device according to the working pixel area of the display chip.

In a possible implementation manner, the determining the working pixel area of the display chip according to the target projection picture includes:

when the placement position of the projection device changes, trapezoidal correction is performed, and the working pixel area of the display chip is determined according to the corrected target projection picture.

In a possible implementation manner, the adjusting the light spot adjusting device according to the working pixel area of the display chip includes:

acquiring a second amplification factor, wherein the second amplification factor is the amplification factor of a light spot on a display chip on a first plane where the light spot adjusting device is positioned; determining a target light spot area on the first plane according to the working pixel area of the display chip and the second magnification; and adjusting the light spot adjusting device according to the target light spot area to form a light spot forming area covering the target light spot area on the first plane.

In a possible implementation manner, each side of the light spot forming area is parallel to or coincides with the corresponding side of the target light spot area.

In a possible implementation, the second magnification includes a longitudinal magnification and a lateral magnification;

the determining, according to the working pixel area of the display chip and the second magnification, the target light spot area on the first plane includes:

acquiring longitudinal distances and transverse distances between each vertex of a working pixel area of the display chip and the edge of an original pixel area of the display chip;

according to the longitudinal distance between each vertex and the edge of the original pixel area of the display chip and the longitudinal magnification, determining the longitudinal distance between the corresponding vertex of the target light spot area on the first plane and the edge of the original light spot area on the first plane;

and determining the transverse distance between the corresponding vertex of the target light spot area on the first plane and the edge of the original light spot area on the first plane according to the transverse distance between each vertex and the edge of the original pixel area of the display chip and the transverse magnification.

In a possible implementation manner, the dodging element includes a compound eye, the compound eye includes a plurality of lens units, the target light spot area includes a plurality of sub-target light spot areas, the light spot forming area includes a plurality of sub-light spot forming areas, the sub-target light spot areas are in one-to-one correspondence with the lens units, and the sub-light spot forming areas are in one-to-one correspondence with the sub-target light spot areas.

In a second aspect, the present invention provides a projection display method, applied to the projection device of the first aspect, the method comprising:

and determining a working pixel area of a display chip according to the target projection picture, and adjusting the light spot adjusting device according to the working pixel area of the display chip, so that the working pixel area of the display chip is covered by the formed light spots irradiated on the display chip, and the shape of the formed light spots is the same as that of the working pixel area of the display chip.

According to the invention, the light spot adjusting device is arranged in the illumination system of the projection equipment, the working pixel area of the display chip is determined according to the target projection picture, and then the light spot adjusting device is adjusted according to the working pixel area of the display chip, so that the formed light spots irradiated on the display chip cover the working pixel area of the display chip, the shape of the formed light spots is the same as that of the working pixel area of the display chip, the projection picture with a specific shape and/or size can be projected according to the requirement, and further, the gray edges of the projection picture can be eliminated or reduced.

Drawings

Fig. 1 is a schematic functional block diagram of a projection device according to an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a projection device according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an illumination system according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a light spot adjusting device according to an embodiment of the present invention;

FIG. 5 is a flowchart of a method for controlling projection display according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a compound eye according to an embodiment of the present invention;

fig. 7 is a schematic view illustrating a lens optical axis of a projection apparatus according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a front projection position of a projection device according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a tilt position of a projection device according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a projection screen after trapezoidal correction according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a working pixel area of a trapezoid-corrected display chip according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of a position of a working pixel region of a display chip according to an embodiment of the present invention;

fig. 13 is a schematic diagram of a position of a target spot area according to an embodiment of the present invention;

fig. 14 is a schematic view of a target spot area according to an embodiment of the present invention;

Fig. 15 is a schematic view of spot imaging according to an embodiment of the present invention;

fig. 16 is a schematic view of a spot forming area of a compound eye cell according to an embodiment of the present invention;

fig. 17 is a schematic view of a spot forming area of a compound eye according to an embodiment of the present invention;

fig. 18 is a schematic structural diagram of a liquid crystal panel according to an embodiment of the present invention;

FIG. 19 is a schematic diagram of a polarization conversion element according to an embodiment of the present invention;

fig. 20 is a flowchart of a projection display method according to an embodiment of the present invention.

Detailed Description

In order to better understand the technical solutions of the present invention, the following description will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. While the present disclosure has been described in terms of an exemplary embodiment or embodiments, it should be understood that each aspect of the disclosure may be separately provided as a complete solution. The following embodiments and features of the embodiments may be combined with each other without conflict.

In the present invention, for the purpose of clearly describing the technical solutions of the embodiments of the present invention, the words "first", "second", etc. are used to distinguish identical items or similar items having substantially identical functions and actions, and those skilled in the art will understand that the words "first", "second", etc. do not limit the number and execution order, but merely serve to illustrate and distinguish between the objects to be described, without separating the order, nor do they represent that the number of devices or messages in the embodiments of the present invention is particularly limited, and cannot constitute any limitation of the embodiments of the present invention. "plurality" means two or more, and the like, means that the element or article recited in the preceding word "comprise" or "comprises", and the like, is meant to encompass the element or article listed thereafter and equivalents thereof without precluding other elements or articles.

In order that the invention may be fully understood, a detailed description will be provided below in order to illustrate the technical aspects of the invention. Preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments in addition to these detailed descriptions.

Fig. 1 is a schematic functional block diagram of a projection device according to an embodiment of the present invention. As shown in fig. 1, the projection device includes an image processor 101 and a projection light engine 102. Wherein:

The image processor 101 may be a microcontroller, a dedicated image processing chip, etc., and the microcontroller may be an ARM chip, a micro control unit (Microcontroller Unit; MCU), etc.; the dedicated image processing chip may be an image signal processor (Image Signal Processing, ISP), a graphics processor (graphics processing unit, GPU), an embedded neural network processor (neural-network process units, NPU), or the like. The image processor 101 may be used for video decoding, image quality processing, and the like.

The projection light engine 102 may include a driver chip, a spatial light modulator, a light source, and the like. Wherein the light source may include a laser light source, an LED light source, a fluorescent light source, etc.; the spatial light modulator may be a digital micromirror device (Digtial Micromirror Devices, DMD), a liquid crystal device (Liquid Crystal Display, LCD), a liquid crystal on silicon device (Liquid Crystal on Silicon, LCOS), or the like, for modulating light source light to generate image light; the driver chip corresponds to a spatial light modulator, for example, a digital micromirror device may be driven with a digital light processing element (Digital Light Processing, DLP). The projection light machine 102 is used for projecting an image to be projected into a projection screen.

In some embodiments, the projection device further includes a central controller 103, which may be a CPU, ARM, MCU or like controller, of one or more processing cores. The central controller 103 is a control center of the projection device, and may run or execute software programs and/or an operating system stored in the storage module 104 and invoke data stored in the storage module 104 using various interfaces and lines to connect various parts of the entire projection device. Alternatively, the image processor 101 and the central controller 103 may be integrated as one processor.

In some embodiments, the projection device further includes a storage module 104, an input module 105, and components of a communication module 106, a power supply 107, and the like, of one or more computer-readable storage media. It will be appreciated by those skilled in the art that the projection device structure shown in FIG. 1 is not limiting of the projection device and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components. Wherein:

the memory module 104 may be used to store software programs and an operating system, and the central controller 103 executes various functional applications and data processing by running the software programs and the operating system stored in the memory module 104. The storage module 104 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data created according to the use of the projection device, etc. In addition, the memory module 104 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory module 104 may also include a memory controller to provide access to the memory module 104 by the central controller 103.

The projection device may further comprise an input module 105, which input module 105 may be used to receive entered numerical or character information and to generate remote control, keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

The projection device may also include a communication module 106, and in some embodiments the communication module 106 may include a wireless module, through which the projection device may wirelessly transmit over short distances, thereby providing wireless broadband internet access to the user. For example, the communication module 106 may be used to assist a user in accessing streaming media, and the like.

The projection device further includes a power supply 107 for powering the various components, and in some embodiments, the power supply 107 may be logically connected to the central controller 103 via a power management system, such that charge, discharge, and power consumption management functions are performed by the power management system. The power supply 107 may also include one or more of any of a direct current or alternating current power supply, a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator, and the like.

Fig. 2 is a schematic structural diagram of a projection device according to an embodiment of the present invention. As shown in fig. 2, the projection apparatus includes a light source device 201, a dodging element 202, an illumination system 203, a display chip 204, and an imaging system 205. The illumination light generated by the light source device 201 is homogenized by the homogenizing element 202, the illumination system 203 images a light spot on the exit surface of the homogenizing element 202 on the display chip 204 at a first magnification, the display chip 204 modulates the incident illumination light into image light, and the image light enters the imaging system 205, and finally, the image light is imaged on a projected object such as a screen to form a projection screen. The display chip 204 may be any one of DMD, LCOS, LCD; imaging system 205 is typically a lens system, such as a projection lens.

The projection apparatus may further include a light source control module (not shown in the figure) that controls the operation of one or more light sources in the light source device 201 such that the light source device 201 emits light of a prescribed wavelength band required when generating an image. Further, the light source device 201, the light homogenizing element 202, the illumination system 203, the display chip 204, and the imaging system 205 may be included in the projection light engine 102 (refer to fig. 1).

The light source device 201 may include one or more light sources. The light source can be a laser light source, an LED light source, a fluorescent light source, or the like. Further, the light source may be a single light emitting element or an array of light emitting elements, and the array of light emitting elements may include light emitting elements of different colors. For example, the light source may be an LD light source or an LED light source, which generates blue light or green light or red light, or the light source may be a multicolor laser, that is, an array of light emitting elements including a plurality of lasers, for example, the light source may include a blue laser and a red laser, or include a blue laser and a green laser, or include a blue laser, a red laser, and a green laser at the same time.

The light homogenizing element 202 is used for homogenizing illumination light generated by the light source device 201. Specifically, the light homogenizing element 202 includes an incident surface and an exit surface, and the light homogenizing element 202 is configured to perform a homogenizing process on illumination light incident from the incident surface thereof to form a light spot having the same shape as that of the display chip, such as a light spot having a shape of a rectangle, a circle, or the like, on the exit surface thereof. Illustratively, the light homogenizing element 202 may be a light bar, compound eye, or the like.

The illumination system 203 is a portion from the light homogenizing element to the display chip, and is configured to image a light spot on an exit surface of the light homogenizing element 202 on the display chip 204 with an magnification n (n may be greater than 1, less than 1, or equal to 1). In some embodiments, a relay image plane may also exist in the illumination system, where the relay image plane refers to an imaging plane of a light spot on an exit surface of the dodging element in the illumination system, and at this time, the light spot on the exit surface of the dodging element is imaged on the relay image plane and then imaged on the display chip again.

In some embodiments, the light homogenizing element 202 is a light bar, and the light spot on the exit surface of the light bar is amplified by the illumination system 203 (n>1) Or reduce (n)<1) Then, the light beam irradiates the display chip 204, and assuming that the length and width dimensions of the light beam emergent surface are a and b, respectively, and the length and width dimensions of the display chip 204 are a 'and b', a '=n×a, b' =n×b, respectively. Longitudinal magnification n if magnification n _{Longitudinal direction} And a lateral magnification n _{Transverse bar} Different, then a' =n _{Longitudinal direction} *a，b’＝n _{Transverse bar} * b. In other embodiments, the light homogenizing element 202 For the compound eye, the compound eye includes a plurality of (two or more) lens units, and the light spot of each lens unit is amplified by the illumination system 203 (n>1) Or reduce (n)<1) After that, the display chip 204 is irradiated, and the relationship between the size of each lens unit and the size of the display chip is the same as that of the light bar scheme, which is not described herein.

Fig. 3 is a schematic structural diagram of an illumination system according to an embodiment of the present invention. As shown in fig. 3, the illumination system includes a lens 2, a lens 3, and a lens 4, and the light spot on the exit surface 1 of the dodging element is magnified by the lens 2, the lens 3, and the lens 4 and then imaged on the surface 5 of the display chip.

Further, the lighting system further includes a spot adjusting device (not shown in the figure), where the spot adjusting device is used to adjust an effective spot area (i.e. a spot area that can be irradiated onto the display chip), for example, a spot on the light bar outgoing surface is rectangular, and the shape and/or the size of the spot irradiated onto the display chip can be changed by adjusting the spot adjusting device through the control module. Specifically, the control module can determine the working pixel area of the display chip according to the target projection picture, and then adjust the light spot adjusting device according to the working pixel area of the display chip, so that the forming light spot irradiated on the display chip covers the working pixel area of the display chip, and the shape of the forming light spot is the same as that of the working pixel area of the display chip.

Optionally, the projection apparatus further includes a fixing device (not shown in the figure) for fixing the light homogenizing element and the light spot adjusting device, so that the relative positions of the light homogenizing element and the light spot adjusting device remain unchanged, for example, the distance between the light homogenizing element and the light spot adjusting device is 2mm, and when the light spot adjusting device is adjusted, the distance between the light homogenizing element and the light spot adjusting device is ensured to be 2mm unchanged, thereby ensuring the adjustment effectiveness of the light spot adjusting device. For example, the light homogenizing element and the light spot adjusting device may be both fixed in the housing of the optical machine, so as to keep the relative position between the two unchanged, or the light homogenizing element and the light spot adjusting device may be fixed together by means of a buckle or high-temperature-resistant glue.

Preferably, the light spot adjusting device is located at the exit surface of the light homogenizing element, and the light spot adjusting device can be disposed as close to the exit surface of the light homogenizing element as possible, for example, the distance between the surface of the light spot adjusting device close to the light homogenizing element and the exit surface of the light homogenizing element is 0-5mm, for example, 3mm or 2mm, so that the shape and/or the size of the light spot irradiated on the display chip can be controlled more accurately. The embodiment of the invention does not limit the structure of the spot adjusting device, and in order to facilitate understanding of the invention, a schematic structure of the spot adjusting device is given below by way of example.

Referring to fig. 4, the spot adjusting apparatus includes one or more blocking pieces, and illustratively, the spot adjusting apparatus includes 4 independent blocking pieces 7, each of which is linked to a gear 8, and the gears 8 are linked to a track 6. The motor drives the gear 8 to slide and/or rotate independently on the track 6 to drive the baffle 7 to move and/or rotate and/or swing, and 4 baffles 7 can enclose light holes with any shape, so that diaphragms with any shape can be obtained.

In some embodiments, the light homogenizing element is a light rod, the light energy of the light emitting surface of the light rod is generally concentrated, the energy irradiated on the baffle 7 is also strong, most of the energy is absorbed by the baffle 7 and then converted into heat energy, the baffle 7 is connected with the housing of the optical machine by using heat dissipation mud or other heat dissipation mediums, or a heat dissipation device such as a heat dissipation fin is designed outside the optical machine, and the heat dissipation device is connected with the baffle 7 to dissipate heat.

Fig. 5 is a flowchart of a projection display control method according to an embodiment of the present invention. As shown in fig. 5, the projection display control method includes the following:

s1001, acquiring a working pixel area of a display chip and a second amplification factor, wherein the second amplification factor is the amplification factor of a light spot on the display chip on a first plane where the light spot adjusting device is located.

Specifically, the working pixel area of the display chip may be determined according to the target projection screen. In some embodiments, when it is required to form a projection screen having a shape such as an elongated shape or a circular shape on the projection screen, the working pixel area of the display chip corresponds to the shape such as an elongated shape or a circular shape. In other embodiments, when the placement position of the projection device is changed, the active pixel area of the display chip is changed if the trapezoidal correction is performed.

When the position of the light spot adjusting device is determined, the second magnification is a determined value, if the light spot adjusting device is arranged close to the emergent surface of the light homogenizing element, the second magnification is the first magnification n; in another example, if the illumination system has a relay image plane, the spot adjusting device may also be disposed at the position of the relay image plane (may deviate from the position of the relay image plane by a certain distance, but is optimally at the position of the relay image plane), where the spot size of the relay image plane has a relationship with the spot size on the display chip, for example, the first magnification n=3, where the magnification may be 1.5 or 2.

S1002, determining a target light spot area on the first plane according to the working pixel area of the display chip and the second magnification.

Specifically, if the size of the working pixel area of the display chip is Q and the second magnification is m, the size p=q/m of the target spot area on the first plane is the same as the shape of the working pixel area of the display chip. For example, assume that the longitudinal magnification of the light spot on the first plane in the longitudinal direction of the display chip is m _{Longitudinal direction} A lateral magnification m in a lateral direction of the display chip _{Transverse bar} The working pixel area of the display chip is rectangular with length i and width j, and the target light spot area is i/m _{Longitudinal direction} Width of j/m _{Transverse bar} Is a rectangular shape of (c).

In some embodiments, the longitudinal distance and the transverse distance between each vertex of the working pixel region of the display chip and the edge of the original pixel region of the display chip can be obtained first; then, according to the longitudinal distance between each vertex and the edge of the original pixel area of the display chip and the longitudinal magnification, determining the longitudinal distance between the corresponding vertex of the target light spot area on the first plane and the edge of the original light spot area on the first plane; and determining the transverse distance between the corresponding vertex of the target light spot area on the first plane and the edge of the original light spot area on the first plane according to the transverse distance between the vertices relative to the edge of the original pixel area of the display chip and the transverse magnification, and determining the position of the target light spot area on the first plane according to the longitudinal distance and the transverse distance between the vertices of the target light spot area on the first plane and the edge of the original light spot area on the first plane. The original pixel area of the display chip refers to an original pixel area of the display chip, and the original light spot area on the first plane refers to a light spot area corresponding to the original pixel area of the display chip.

S1003, adjusting the light spot adjusting device according to the target light spot area so as to form a light spot forming area covering the target light spot area on the first plane.

In some embodiments, after the target light spot area is determined, the light spot adjusting device may be used to block the area outside the target light spot area to form a light spot forming area covering the target light spot area, where the light spot forming area should be as close to the target light spot area as possible, so as to reduce or eliminate the gray edges of the projection picture, and improve the projection effect. Preferably, each side of the spot forming area is parallel to (the distance between two parallel sides is within a preset range) or coincides with the corresponding side of the target spot area, so as to further improve the projection effect.

For a dodging element including a plurality of sub-dodging units, for example, the dodging element is a compound eye including a plurality of lens units, light spots of each sub-dodging unit are irradiated on a display chip through an illumination system, as shown in fig. 6, outgoing light spots of each sub-dodging unit 10 of the dodging element 9 are mapped on the display chip 11 one by one, so that the light spot adjusting device needs to adjust the outgoing light spot of each sub-dodging unit, so that each sub-dodging unit outputs a light spot with a required shape and/or size, and at this time, each sub-dodging unit corresponds to a target light spot area.

After the light spot of the emergent surface of the light homogenizing element passes through the light spot adjusting device, only the light passing through the light spot forming area irradiates the display chip, and the light spot forming area is basically the same as the target light spot area which is determined according to the working pixel area required by the display chip, so that a projection picture with any shape can be projected, and the gray edges of the projection picture can be reduced or eliminated.

For a better understanding of the present invention, a scenario of trapezoidal correction is further described below as an example. In this embodiment, it is assumed that the flare adjusting device is disposed close to the exit surface of the light homogenizing element, and the light homogenizing element is a light rod.

When the lens optical axis of the projection light machine and the projection screen are in a vertical state (as shown in fig. 7) and the projection light machine is horizontally arranged (as shown in fig. 8), the projection image is a regular horizontal rectangle. When the projection light machine does not meet the above two conditions, the projection screen is subjected to keystone distortion or tilting, as shown in fig. 9.

The most common approach to solving the above picture distortion is currently trapezoidal correction. The trapezoidal correction is to cut a new horizontal and regular rectangle in the distorted picture. After the trapezoidal correction is performed, the projection picture is shown in fig. 10, in which the area a is the actual viewing picture area, i.e., the effective projection picture, and the area b is the peripheral area of the effective projection picture. The pixel control unit of the display chip corresponding to the effective projection picture is in an on state, and as shown in a region c in fig. 11, the pixel control unit corresponds to a region a in the projection picture (fig. 10); the peripheral area of the effective projection screen corresponds to the pixel control unit of the display chip in an off state, as shown in fig. 11 as the d area, and corresponds to the b area of the projection screen (fig. 10).

Because the display chip still has a part of illumination light to illuminate the area or has a small part of light energy to project to the screen in the non-working state, after the trapezoid correction, the area outside the effective cutting picture still has some illumination to form gray edges, so that the viewing experience of a user is affected.

After the projection equipment is started or the placement position of the projection equipment is changed, trapezoidal correction can be started, for example, trapezoidal correction is started when the placement position of the projection equipment is detected to be changed, for example, the projection equipment (such as an eagle eye system of the projection equipment) can detect whether a projection picture is distorted or inclined, a threshold value is set for the distortion or inclination degree, and trapezoidal correction cannot be started when the projection picture is within the threshold value; when the projected picture exceeds the threshold, the trapezoidal correction is initiated.

After the trapezoid correction is started, the pixel area in the on state (namely, the working pixel area of the display chip) in the display chip is known, and the working pixel area of the display chip is determined as the area c shown in fig. 11 through the pixel positions of the four vertexes. According to the working pixel area of the display chip and the magnification n of the lighting system, a target light spot area at the outlet end of the light rod can be calculated, a dotted line frame shown in fig. 14 is an original light spot area at the outlet end of the light rod designed by the initial lighting system, the original light spot area and the light rod end are formed to be identical, such as rectangular, and a solid line frame is the target light spot area at the outlet end of the light rod corresponding to the working pixel area of the display chip after the trapezoid correction is started, and the target light spot area is identical to the working pixel area of the display chip in shape. The following exemplarily provides a method for calculating the target spot area:

1) After the trapezoid correction is started, 4 vertexes of the working pixel area of the display chip are determined to be (1), (2), (3) and (4), wherein (1) is the m1 th column n1 row of the display chip, as shown in fig. 12.

2) The size of each pixel of the display chip is known, and is set to k, so that the distance between the vertex of the working pixel area of the display chip and the edge of the chip is equal to k×pixel number, that is, (1) the distance between the vertex and the edge of the short side of the chip is k×m1, and the distance between the vertex and the edge of the long side of the chip is k×n1.

3) The vertex of the target light spot area at the outlet end of the light bar is in one-to-one mapping relation with the display chip, as shown in fig. 13, wherein, i, ii, iii, iv are the vertex of the target light spot area at the outlet end of the light bar, and are in one-to-one correspondence with 4 vertices (1), (2), (3), and (4) of the working pixel area of the display chip.

4) According to the magnification n of the illumination system, the distance between the vertex I and the short side of the optical rod end face is k x m1/n, and the distance between the vertex I and the long side of the optical rod end face is k x n1/n.

5) The same algorithm can calculate the distances between the peaks II, III and IV and the edge of the optical rod, and then the position of the target light spot area at the outlet end of the optical rod can be determined.

In some embodiments, the illumination system may have a relay image plane, and the spot adjusting device may be further placed at the relay image plane. The more the spot adjusting device is overlapped with the position of the relay image surface, the better the shielding effect is. The calculation method of the target spot area on the relay image plane is the same as that of the light bar emergent plane, and will not be described in detail here.

The light spot adjusting device is adjusted to block the area outside the solid line frame in fig. 14 on the light-rod outgoing surface (i.e., the light-rod end surface). Preferably, the shielding frame of the light spot adjusting device and the corresponding edge of the target light spot area of the light rod emergent surface are in a combined or parallel state; preferably, in order to make the light spot adjusting device not shade the effective light energy of the edge of the picture, the light passing area surrounded by the light spot adjusting device is larger than or equal to the target light spot area of the light rod emergent surface. By arranging the light spot adjusting device, the gray edges formed by trapezoidal correction of the picture can be effectively eliminated, and the effect is shown in fig. 15.

When the placement position of the projection equipment is changed, the shape and the size of the gray edge of the trapezoid correction image surface are changed, and the light spot forming area surrounded by the light spot adjusting device of the light rod outgoing surface is also changed.

In other embodiments, the light homogenizing element may be a compound eye, which is composed of a plurality of small lens unit arrays, the number of the units is equal to or greater than 2, and each small lens unit is simply called a cell. The emergent light spots of each cell of the compound eye are mapped on the display chip one by one. Therefore, the shape of the light spot irradiated on the display chip can be controlled by adjusting the shape of the outgoing light spot of the cell. After the trapezoid correction can be calculated through the working pixel area of the display chip and the amplification rate of the illumination system, the shape of the light spot (namely the target light spot area) required to be emitted by each cell is calculated by the same method as the method for calculating the target light spot area of the light bar emergent surface, and the calculation is not repeated here.

For example, a liquid crystal panel, namely a flare adjusting device of the compound eye, is added between the compound eye and the display chip at a position close to the compound eye. One cell corresponds to a plurality of pixels of the liquid crystal panel, such as 30, 50 or 80 pixels. Different shapes of cell emission light spots are formed by controlling the on-off of the liquid crystal pixel, as shown in fig. 16. Preferably, the number of liquid crystal pixels corresponding to one cell is greater than or equal to 100, so that the shape of the liquid crystal on-off control approaches to the target light spot area. In other embodiments, the electro-optic filter device may be used as the light spot adjusting device, so as to control the light transmittance of the corresponding area of the electro-optic filter device according to the target light spot area to realize light blocking and light transmittance.

After the target light spot area of each cell is obtained, the parameter information of the target light spot area can be stored in the control module, and the opening and closing of the liquid crystal pixels are controlled according to the parameter information of the target light spot area, so that the cell emergent light spots with any shape are finally achieved. Preferably, each side of a light spot forming area formed by opening and closing the liquid crystal pixels is in a coincident or parallel state with each side of a target light spot area, so that gray edges can be eliminated or reduced; in order to prevent effective light energy at the edge of the screen from being blocked, a light spot forming area formed by opening and closing the liquid crystal pixels is larger than or equal to a target light spot area. In the whole compound eye, the spot forming area corresponding to each cell is the same, as shown in fig. 17, the left side of the figure is the open-close state of the liquid crystal pixel corresponding to each cell, and the right side is the open-close device of the liquid crystal pixel corresponding to the whole compound eye.

Fig. 18 is a schematic structural diagram of a liquid crystal panel according to an embodiment of the present invention. As shown in fig. 18, the liquid crystal panel includes a polarizer 801, a liquid crystal layer 802 and an analyzer 803, when natural light passes through the polarizer 801, only linear polarized light in one direction can pass through, when the liquid crystal layer 802 is turned on, the polarization direction of the light can be rotated by 90 degrees, and when the polarizer 801 is turned on, the polarization direction of the light which can pass through the analyzer 803 is perpendicular to the polarization direction of the polarizer, for example, the polarizer 801 can only pass through light in S polarization state, and when the liquid crystal layer 802 is turned on, the analyzer 803 can pass through light in P polarization state, and when the polarizer 801 is turned on, the light in S polarization state is converted into light in P polarization state, and then the light is transmitted through the analyzer 803. When the liquid crystal panel controls a pixel to not pass light, the liquid crystal layer is in a closed state, and the polarization direction of the light passing through the liquid crystal layer 802 is unchanged, so that the light cannot pass through the pixel. When the liquid crystal panel controls light passing through a pixel, the liquid crystal layer 802 is in an on state, and the polarization direction of the light passing through the liquid crystal layer 802 is changed, so that the light can pass through the pixel.

In some embodiments, when the light emitted from the light source device is natural light, a polarization conversion element may be added between the light source device and the compound eye to convert the natural light into linear polarized light, so as to reduce the loss of energy of the light source, as shown in fig. 19, the polarization conversion element 901 converts the natural light into light in S polarization state, and the light in S polarization state is still in S polarization state after passing through the compound eye, and finally enters the liquid crystal panel 903.

With continued reference to fig. 19, the polarization conversion element may include a first prism 9011, a half-wave plate 9012, and a second prism 9013, where a P-permeable S-back film is plated on a bonding surface of the first prism 9011 and the second prism 9013, and the film layer may be disposed on an inclined surface of the first prism 9011 or on an inclined surface of the second prism 9013, and a surface opposite to the bonding surface of the second prism 9013 is a reflective surface. A beam of natural light mainly comprises light rays in two polarization states of S and P, and the natural light is divided into the light rays in the P polarization state and the S polarization state on the joint surface of the two prisms. Wherein, the prism outlet of the P-polarized light path is tightly attached to a half wave plate, so that the P-polarized light is converted into S-polarized light, and the S-polarized light is reflected by the reflecting surface of the second prism 9013 and is incident to the compound eye 902; or the P polarized light is directly incident to the compound eye 902 through the first prism 9011, and a half wave plate is tightly attached to the prism outlet of the S polarized light path, so that the S polarized light is converted into the P polarized light. Therefore, all the light rays entering the compound eye are in the same polarization state, and the disadvantage of 1/2 of light energy loss after passing through the liquid crystal panel is avoided. Optionally, the air cooling device can be used for cooling the liquid crystal panel, so that the service life of the liquid crystal panel is prolonged.

Fig. 20 is a flowchart of a projection display method according to an embodiment of the present invention. As shown in fig. 20, the projection display method includes:

s2001, determining the target shape.

In some embodiments, the target shape may be determined according to user needs. For example, after the projection device is turned on, a projection screen including a display selection interface (such as a pop-up window, a dialog box, etc.) is displayed, where parameters such as a display mode and/or a display shape may be included in the display selection interface. Wherein, the display mode can comprise a film watching mode, a personality mode, a screen throwing mode and the like, and the display shape can comprise a rectangle, a circle, a pentagon, a heart shape and the like. After the user selects the related content in the display selection interface through a remote controller, gestures, voices and the like, the display selection interface is hidden to the side of the picture or directly disappears. If the display shape selected by the user is pentagonal, the target shape is pentagonal. It should be understood that the projection device may also automatically select a corresponding display mode and/or display shape, and the target shape may also be the shape of the target projection screen after performing the trapezoidal correction.

In other embodiments, the projection device may automatically determine the target shape. For example, the projection device may determine the target shape from the data source, such as when the projection device identifies the data source being played as a movie, may automatically determine the target shape as a 16:9 rectangular shape; when the projection device recognizes that the played data source is a photograph, the target shape can be randomly determined to be heart-shaped, pentagonal, and the like.

Optionally, user portrait information and/or environmental information may also be obtained, where the user portrait information includes a viewing frame size, a brightness parameter, a color gamut parameter, and the like; the environment information comprises environment light intensity, time and the like, and the target shape is determined based on the user portrait information and/or the environment information, so that the projection picture shape can be adjusted according to user preference or environment, for example, the gray edges are observed at night, the gray edges are not observed in the daytime, or the gray edges are less in cutting.

S2002, controlling a light spot adjusting device in the projection equipment according to the target shape, and adjusting the effective light spot area of the original light spot emitted by the light homogenizing element so as to project a projection picture of the target shape.

Specifically, when the target shape is pentagon, the light spot adjusting device is controlled to form a pentagon effective light spot area, if the original light spot of the light bar emergent surface is rectangular, the baffle plate position of the light spot adjusting device is adjusted, and the baffle plate is utilized to enclose the pentagon effective light spot area, so that a pentagon projection picture is projected.

In some embodiments, if the display mode selected by the user is the movie mode, the display shape corresponds to a 16:9 rectangular shape, and the spot adjusting device is controlled to form a spot area with the 16:9 rectangular shape. Further, film viewing parameters of the film source can be obtained, the film viewing parameters comprise resolution, whether the 16:9 rectangular shape is supported or not is judged according to the resolution, and if the film viewing parameters are supported, the light spot adjusting device is controlled to form a light spot area in the 16:9 rectangular shape; if not, the projection screen is presented.

In other embodiments, if the display mode and the display shape selected by the user are respectively a projection mode and a vertical screen rectangle, the spot adjusting device is controlled to form a corresponding vertical screen rectangle spot area. Further, whether the data source supports the corresponding shape can be judged, if the data source is obtained, the data source picture is judged to belong to a horizontal screen or a vertical screen, whether the data source supports a vertical screen rectangle is judged, and if so, the light spot adjusting device is controlled to form a corresponding vertical screen rectangle light spot area; if not, the projection screen is presented.

It is to be understood that the term "module" of embodiments of the present invention may refer to an application specific integrated circuit (application specific integrated circuit, ASIC), an electronic circuit, a processor (e.g., a shared, dedicated, or group processor, etc.) and memory that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that support the described functionality. The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, that is, may be located in one place, or may be distributed over a plurality of network modules, where some or all of the modules may be selected according to actual needs to achieve the purposes of the embodiment of the present invention. The division of the modules is merely a logic function division, and there may be other division manners in actual implementation, for example, one module or component may be divided into multiple modules or components, or multiple modules or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules, which may be in electrical, mechanical, or other forms.

Those of ordinary skill in the art will appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A projection device, comprising:

a light source device for generating illumination light;

a display chip for modulating the illumination light into image light;

2. A projection device as claimed in claim 1, characterized in that the distance between the surface of the spot adjusting means close to the light homogenizing element and the exit surface of the light homogenizing element is 0-5mm.

3. A projection device as claimed in claim 1, further comprising:

4. A projection device as claimed in claim 1, characterized in that the light homogenizing element comprises a light bar and the spot adjusting means comprise one or more shutters which are rotatable and/or movable and/or swingable.

5. The projection device of claim 1, wherein the light homogenizing element comprises a compound eye comprising a plurality of lens units; the light spot adjusting device comprises a liquid crystal panel, the liquid crystal panel comprises a plurality of pixel units, the pixel units are in one-to-one correspondence with the lens units, and a plurality of pixels in each pixel unit can be opened or closed.

6. The projection device of claim 4, wherein the one or more baffles are coupled to the bare engine housing of the projection device via a heat sink medium or the one or more baffles are coupled to a heat sink.

7. A projection device as claimed in claim 1, further comprising:

8. The projection device of claim 7, wherein the determining the working pixel area of the display chip based on the target projection screen comprises:

9. The projection device of claim 7, wherein the means for adjusting the spot size based on the active pixel area of the display chip comprises:

10. A projection device as claimed in claim 9, wherein each side of the spot-forming area is parallel or coincident with a corresponding side of the target spot area.

11. The projection device of claim 9, wherein the second magnification includes a longitudinal magnification and a lateral magnification;

12. The projection apparatus of claim 9 wherein the dodging element comprises a compound eye comprising a plurality of lens units, the target spot area comprises a plurality of sub-target spot areas, the spot forming area comprises a plurality of sub-spot forming areas, wherein the sub-target spot areas are in one-to-one correspondence with the lens units, and the sub-spot forming areas are in one-to-one correspondence with the sub-target spot areas.

13. A projection display method applied to the projection device of any one of claims 1-12, the method comprising: