CN116540482A - Projection display system, method and projector - Google Patents

Abstract

The application discloses a projection display system, a projection display method and a projector. Wherein, this system includes: the light combining and illuminating module is used for combining, homogenizing and scaling the light source to obtain a first light beam; a spatial light modulator for modulating the incident beam and the projection screen information to obtain an emergent beam; the transmission type grating is positioned between the combined light illumination module and the spatial light modulator, adjusts the light intensity distribution of the first light beam based on projection picture information to obtain an incident light beam, or is positioned between the combined light illumination module and the imaging module, and adjusts the light intensity distribution of the emergent light beam based on the projection picture information to obtain a second light beam; the imaging module projects the emergent light beam or the second light beam to obtain a projection picture; and the control module is used for transmitting the projection picture information to the transmission type grating and the spatial light modulator. The technical problems that the projector is affected by stray light when in projection display, so that the contrast of a projection picture is poor, and the user watching experience is poor are solved.

Description

Projection display system, method and projector

technical field

The present application relates to the field of projection technology, in particular, to a projection display system, method and projector.

Background technique

Compared with projectors or TVs with other architectures, DLP (Digital Light Processing)-based projectors have a disadvantage in that the contrast of the projection screen is not good. The main reason is that its core component DMD (Digital Micromirror Device, digital micromirror device) All light rays (stray light and imaging light) are collected and processed, and no other scheme is adopted to distinguish stray light. If the contrast of the DLP architecture projector can be improved, the DLP architecture projector will have greater advantages than other architecture projectors.

For the above problems, no effective solution has been proposed yet.

Contents of the invention

Embodiments of the present application provide a projection display system, method, and projector to at least solve the technical problems that the projector is affected by stray light during projection display, resulting in poor contrast of projection images and poor viewing experience for users.

According to an aspect of an embodiment of the present application, there is provided a projection display system, including: a light-combining lighting module, configured to perform light-combining processing, uniform light processing, and scaling processing on a light source to obtain a first light beam; a spatial light modulator , used to modulate the outgoing light beam based on the incident light beam and the projection picture information; the transmissive grating, located between the light-combining lighting module and the spatial light modulator, is used to adjust the first light beam based on the projection picture information The light intensity distribution is used to obtain the incident light beam, and the imaging module is used to project the outgoing light beam to obtain a projection image; or, the spatial light modulator uses the first light beam as the incident light beam, and the transmissive The grating is located between the combined light illumination module and the imaging module, and is used to adjust the light intensity distribution of the outgoing light beam based on the projection picture information to obtain a second light beam. The imaging module is used to project the The second light beam is used to obtain a projected image; a control module is configured to transmit information of the projected image to the transmission grating and the spatial light modulator.

Optionally, the transmissive grating includes a plurality of grating partitions of the same size, and for any of the grating partitions, the switch state of the grating partition can be controlled based on the projected picture information; When the type grating is located between the light-combining lighting module and the spatial light modulator, each of the grating partitions corresponds to at least one first sub-beam in the first light beam, and the grating partition is in an open state The at least one first sub-beam is allowed to pass through, the grating partition prohibits the passage of the at least one first sub-beam in an off state, and all the first sub-beams passing through the transmissive grating are used as the incident light beam; when the transmissive grating is located between the light-combining illumination module and the imaging module, each of the grating partitions corresponds to at least one outgoing sub-beam in the outgoing light beam, and the grating partition is in the The at least one outgoing sub-beam is allowed to pass in the on state, and the at least one outgoing sub-beam is prohibited in the off state of the grating partition, and all the outgoing sub-beams passing through the transmissive grating are used as the first Two beams.

Optionally, for any of the grating partitions, the light transmittance of the grating partitions can be controlled based on the projection picture information, so as to adjust the at least one first sub-beam or all the light beams passing through the grating partitions. Describe the light intensity of at least one outgoing sub-beam.

Optionally, the spatial light modulator is: a digital micromirror element or a liquid crystal on silicon element, wherein the spatial light modulator has a plurality of mirrors, and each of the mirrors corresponds to one of the incident light beams. A bundle of incident sub-beams; or, the spatial light modulator is: a liquid crystal screen, wherein, there are multiple liquid crystal control units on the liquid crystal screen, and each of the liquid crystal control units corresponds to one of the incident light beams sub-beam.

Optionally, when the spatial light modulator is a digital micromirror element or a liquid crystal on silicon element, the number of grating divisions of the transmissive grating is less than or equal to the number of pixels of the spatial light modulator, and any two phases The interval between adjacent grating partitions is smaller than the interval between two adjacent mirrors in the spatial light modulator; when the spatial light modulator is a liquid crystal screen, the number of grating partitions of the transmissive grating is less than or It is equal to the number of pixels of the liquid crystal screen, and the interval between any two adjacent grating divisions is smaller than the interval between two adjacent liquid crystal control units in the liquid crystal screen.

Optionally, the imaging module includes an imaging lens, and the spatial light modulator reflects the outgoing light beam to the imaging lens through the combined light illumination module; wherein, the spatial light modulator is the In the case of a liquid crystal screen, the combined light illumination module includes an X prism, and the spatial light modulator reflects the outgoing light beam to the imaging lens through the X prism.

Optionally, the control module includes: a signal processing module, configured to acquire the projection image information, and convert the projection image information into a target electrical signal; a transmission module, configured to transmit the target electrical signal to the The transmission grating and the spatial light modulator.

According to another aspect of the embodiment of the present application, there is also provided a projection display method, including: acquiring a target electrical signal corresponding to the projection screen information; determining the target switch of each grating partition on the transmissive grating based on the target electrical signal state and target light transmittance; based on the target switch state and target light transmittance of each grating partition, adjust the light intensity distribution of the first light beam passing through the transmission grating, and project the obtained incident light beam into the space A light modulator, the spatial light modulator is used to modulate the outgoing light beam based on the incident light beam and the projection picture information, and project the outgoing light beam to an imaging module, and the imaging module is used to project the outgoing light beam to obtain Projecting a picture; or, based on the target switch state and target light transmittance of each grating partition, adjust the light intensity distribution of the outgoing light beam passing through the transmissive grating, and project the obtained second light beam to the imaging module, so The imaging module is used to project the second light beam to obtain a projection picture, the outgoing light beam is modulated by the spatial light modulator based on the incident light beam and the projection picture information, and the incident light beam is the first a beam of light.

According to another aspect of the embodiments of the present application, there is also provided a non-volatile storage medium, the non-volatile storage medium includes a stored program, wherein the non-volatile memory is controlled when the program is running. The device where the storage medium is located executes the projection display method described above.

According to another aspect of the embodiments of the present application, there is also provided a processor, the processor is configured to run a program, wherein the above-mentioned projection display method is executed when the program is running.

According to another aspect of the embodiments of the present application, a projector is further provided, and the projector includes the above-mentioned projection display system.

In the embodiment of the present application, a transmissive grating that can adjust the light intensity distribution of the passing beam based on the projection screen information is introduced into the projection display system, which uses the principle of optical path control to control the on-off of light in the corresponding area of the projection screen in real time, which can realize Filter the stray light in the illumination beam, and dynamically adjust the sensitivity of each area of the projection screen; further, by adjusting the light transmittance of each partition of the transmissive grating, more orders of grayscale contrast can be achieved, which significantly enhances the The imaging contrast of the projected picture improves the display quality of the entire projected picture, and then solves the technical problem of poor contrast of the projected picture caused by stray light when the projector is projected and displayed, and poor viewing experience for users.

Description of drawings

The drawings described here are used to provide a further understanding of the application and constitute a part of the application. The schematic embodiments and descriptions of the application are used to explain the application and do not constitute an improper limitation to the application. In the attached picture:

FIG. 1 is a schematic structural diagram of a projection display system according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a transmission grating applied to a DLP projector according to an embodiment of the present application;

3 is a schematic structural diagram of a transmissive grating applied to an LCD projector according to an embodiment of the present application;

FIG. 4 is a schematic diagram of projection display in an LCD projector according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of another projection display system according to an embodiment of the present application;

FIG. 6 is a schematic flowchart of a projection display method according to an embodiment of the present application;

Fig. 7 is a schematic flowchart of another projection display method according to an embodiment of the present application.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

Example 1

In order to solve the technical problem that the projector is affected by stray light when projecting and displaying, resulting in poor contrast of the projected picture and poor viewing experience for users, an embodiment of the present application provides a projection display system, which can be adjusted based on the projected picture information. The transmissive grating with beam light intensity distribution can control the light on and off in the corresponding area of the projection screen in real time based on the principle of light path control, realize the filtering of stray light in the illumination beam, and dynamically adjust the sensitivity of each area of the projection screen; at the same time, By adjusting the light transmittance of each partition of the transmissive grating, more grayscale contrasts can be achieved, and the imaging contrast of the projection screen can be significantly enhanced, thereby improving the display quality of the entire projection screen and enhancing the user's viewing experience.

Fig. 1 shows a schematic structural diagram of an optional projection display system. As shown in Fig. 1, the system at least includes: a combined light illumination module 10, a spatial light modulator 12, a transmissive grating 14, and an imaging module 16 and control module 18, wherein:

The combined light lighting module 10 is used to perform combined light processing, uniform light processing and scaling processing on the light source to obtain the first light beam;

A spatial light modulator 12, configured to modulate an outgoing light beam based on the incident light beam and projection picture information;

The transmissive grating 14 is located between the light-combining lighting module and the spatial light modulator, and is used to adjust the light intensity distribution of the first light beam based on the projection picture information to obtain the incident light beam;

An imaging module 16, configured to project an outgoing light beam to obtain a projected image;

The control module 18 is used to transmit the projected image information to the transmissive grating and the spatial light modulator.

Specifically, the light-combining lighting module usually includes: a light source module for providing three primary color light sources of R, G, and B; a light-combining element, such as a dichroic filter, for transmitting or reflecting the three primary color light sources to obtain Combining light beams; homogenizing components, such as fly-eye structural optical devices or optical rods composed of microlens arrays, are used to homogenize the combined light beams; lens groups, composed of single or multiple optical lenses, are used to homogenize light beams The processed light spot is scaled to obtain the first light beam, and the light spot formed by the first light beam on the spatial light modulator (that is, the controlled illumination area) matches the pixel pitch of the spatial light modulator, thereby realizing pixel-level illumination control.

The spatial light modulator can modulate a certain parameter of the light field through liquid crystal molecules, such as modulating the amplitude of the light field, modulating the phase through the refractive index, modulating the polarization state through the rotation of the polarized front, or realizing the conversion of incoherent to coherent light. In this way, certain information is written into the light wave to achieve the purpose of light wave modulation. It can easily load information into a one-dimensional or two-dimensional light field, and use the advantages of wide bandwidth of light and multi-channel parallel processing to quickly process the loaded information. It is a real-time optical information processing, optical interconnection , optical computing and other systems core devices.

In some optional embodiments of the present application, the spatial light modulator may be a DMD or LCOS (Liquid Crystal On Silicon, liquid crystal on silicon component), corresponding to a DLP projector and an LCOS projector respectively, and this type of spatial light modulator has Multiple reflectors, each reflector corresponds to a beam of incident sub-beams in the incident beam, that is, corresponds to a pixel. Since the imaging principles of DMD and LCOS are similar, only the principle of reflection is different. The following mainly uses DMD to illustrate, and DMD can be used Replaced by LCOS. Optionally, the spatial light modulator can also be a liquid crystal screen, corresponding to an LCD projector, with multiple liquid crystal control units (also called liquid crystal molecules) on the liquid crystal screen, and each liquid crystal control unit corresponds to a bunch of incident sub-units in the incident light beam. A light beam corresponds to a pixel.

In order to deal with the stray light in the illumination beam and enhance the imaging contrast of the projected picture, the embodiment of the present application introduces a transmissive grating (which can be a liquid crystal screen, a photoelectric conversion film or other through Electronically controlled to change the light transmittance components), used to adjust the light intensity distribution of the first light beam based on the projection screen information to obtain the incident light beam.

Specifically, FIG. 2 is a schematic structural diagram of an optional transmissive grating applied to a DLP projector, and FIG. 3 is a schematic structural schematic diagram of an optional transmissive grating applied to an LCD projector, wherein, The transmissive grating includes a plurality of grating partitions of the same size. For any grating partition, the switch state of the grating partition can be controlled based on the projection picture information; wherein, each grating partition corresponds to at least one of the first beams of the first beam. The sub-beams, the grating partition allows the at least one first sub-beam to pass through in the on state, and the grating partition prohibits the at least one first sub-beam from passing through in the off state, and all the first sub-beams passing through the transmission grating serve as a space The incident light beam to the light modulator.

As shown in Figure 2, when the spatial light modulator is a digital micromirror element or a silicon-based liquid crystal element, the length and width of the transmissive grating must be greater than or equal to the size of the effective area of light on the spatial light modulator, and the number of grating divisions Less than or equal to the number of pixels of the spatial light modulator; since the grating partitions are physically assembled, in order to ensure that each grating partition will not block the reflector on the spatial light modulator, the distance between any two adjacent grating partitions is less than the space The spacing between two adjacent mirrors in a light modulator.

As shown in Figure 3, when the spatial light modulator is a liquid crystal screen, the length and width of the transmissive grating are greater than or equal to the size of the effective area of light on the liquid crystal screen, and the number of grating divisions is less than or equal to the number of pixels of the liquid crystal screen. Each grating partition will not block the liquid crystal control unit on the liquid crystal screen, and the interval between any two adjacent grating partitions needs to be smaller than the interval between two adjacent liquid crystal control units in the liquid crystal screen.

In some optional embodiments of the present application, for any grating partition, the light transmittance of the grating partition can be controlled based on the projection picture information, so as to adjust the light intensity of at least one first sub-beam passing through the grating partition.

The imaging module includes an imaging lens, and the spatial light modulator reflects the outgoing light beam to the imaging lens through the light-combining lighting module; wherein, when the spatial light modulator is a liquid crystal screen, the light-combining lighting module includes an X prism, and the spatial light modulator will The outgoing beam is reflected by the X prism to the imaging lens.

The control module includes: a signal processing module, used to obtain projection image information, and convert the projection image information into a target electrical signal; a transmission module, used to transmit the target electrical signal to the transmissive grating and the spatial light modulator.

In the above-mentioned projection display system, the specific light control logic is as follows: the light-combining lighting module performs light-combining processing, uniform light processing, and scaling processing on the light source to obtain the first light beam; the transmissive grating adjusts The light intensity distribution of the first light beam is used to obtain the incident light beam; the spatial light modulator obtains the outgoing light beam based on the modulation of the incident light beam and the projection picture information transmitted by the control module, and reflects the outgoing light beam to the imaging module through the combined light illumination module; the imaging module projects the outgoing light beam Get the projected screen.

When the above system is applied to a DLP projector (the same is true for LCOS projectors), the first light beam passes through the transmission grating, and hits the DMD reflector as an incident light beam, and the reflected outgoing light beam is reflected to the Imaging lens, in this process, when a local dark picture is required, the grating partition of the transmissive grating corresponding to the DMD reflector corresponding to the dark picture of the projected picture will be closed, thereby blocking the corresponding illumination beam, and DMD will no longer be generated. Reflected light beams, naturally there is no reflected light beams reflected into the imaging lens.

When the above system is applied to an LCD projector, the first light beam passes through the transmission grating, hits the liquid crystal screen as an incident light beam, and is reflected to the imaging lens through the X-shaped prism. This process can be referred to in Figure 4. In this process In the case of a partial dark screen, the grating partitions of the transmissive grating corresponding to the liquid crystal area of the dark screen corresponding to the projected screen will be closed, thereby blocking the corresponding illuminating light beam so that it cannot enter the lens.

By matching with the picture signal (projection picture information), using the electronic control method, the grating partitions of the transmission grating can be continuously switched on and off, so that the sensitivity of each area of the projection picture can be dynamically adjusted; further, by adjusting the transmission The light transmittance of each grating partition of the type grating can achieve more gray-scale contrasts, thereby improving the display quality of the entire projection screen.

Fig. 5 shows a schematic structural diagram of another optional projection display system. As shown in Fig. 5, the system also includes: a combined light illumination module 50, a spatial light modulator 52, a transmissive grating 54, and an imaging module 56 and control module 58, wherein:

A light-combining lighting module 50, configured to perform light-combining processing, uniform light processing, and scaling processing on the light source to obtain the first light beam;

The spatial light modulator 52, using the first light beam as an incident light beam, is used to modulate and obtain an outgoing light beam based on the incident light beam and projection picture information;

The transmissive grating 54 is located between the combined light illumination module and the imaging module, and is used to adjust the light intensity distribution of the outgoing light beam based on the information of the projected picture to obtain the second light beam;

an imaging module 56, configured to project a second light beam to obtain a projected image;

The control module 58 is used to transmit the projected image information to the transmissive grating and the spatial light modulator.

In this system, the spatial light modulator can be DMD or LCOS, which correspond to DLP projectors and LCOS projectors respectively. There are multiple mirrors on this type of spatial light modulator, and each mirror corresponds to one of the incident beams. The sub-beam corresponds to one pixel. Since the imaging principles of DMD and LCOS are similar, there is only a difference in the principle of reflection. The following mainly uses DMD to illustrate, and DMD can be replaced by LCOS.

The transmissive grating is located between the light-combining lighting module and the imaging module, and it includes multiple grating partitions of the same size. For any grating partition, the switch state of the grating partition can be controlled based on the projection screen information; each grating partition corresponds to At least one outgoing sub-beam in the outgoing beam, the grating partition allows at least one outgoing sub-beam to pass through in the on state, and prohibits at least one outgoing sub-beam in the off state, and all the exiting beams passing through the transmission grating The sub-beam is used as the second beam, and the specific structure can refer to FIG. 2 .

Optionally, for any grating partition, the light transmittance of the grating partition can be controlled based on the projection picture information, so as to adjust the light intensity of at least one outgoing sub-beam passing through the grating partition.

The specific light control logic in this system is as follows: the combination light module performs light combination processing, uniform light processing and scaling processing on the light source to obtain the first light beam; the spatial light modulator takes the first light beam as the incident light beam, based on the incident light beam and the control module The transmitted projection picture information is modulated to obtain an outgoing light beam; the transmission grating adjusts the light intensity distribution of the outgoing light beam based on the projection picture information transmitted by the control module to obtain a second light beam; the imaging module projects the second light beam to obtain a projection picture.

When the above system is applied to a DLP projector (the same is true for LCOS projectors), the first light beam hits the DMD reflector as the incident light beam, and the reflected outgoing light beam is reflected by the light-combining lighting module and then passes through the transmissive grating The obtained second light beam is then projected to the imaging lens. In the process, when a local dark picture is required, the grating partition of the transmissive grating corresponding to the DMD reflector corresponding to the dark picture of the projected picture will be closed, thereby blocking the corresponding of the illuminating beam so that it cannot enter the lens.

By matching with the picture signal (projection picture information), using the electronic control method, the grating partitions of the transmission grating can be continuously switched on and off, so that the sensitivity of each area of the projection picture can be dynamically adjusted; further, by adjusting the transmission The light transmittance of each grating partition of the type grating can achieve more gray-scale contrasts, thereby improving the display quality of the entire projection screen.

In the embodiment of the present application, a transmissive grating that can adjust the light intensity distribution of the passing beam based on the projection screen information is introduced into the projection display system, which uses the principle of optical path control to control the on-off of light in the corresponding area of the projection screen in real time, which can realize Filter the stray light in the illumination beam, and dynamically adjust the sensitivity of each area of the projection screen; further, by adjusting the light transmittance of each partition of the transmissive grating, more orders of grayscale contrast can be achieved, which significantly enhances the The imaging contrast of the projected picture improves the display quality of the entire projected picture, and then solves the technical problem of poor contrast of the projected picture caused by stray light when the projector is projected and displayed, and poor viewing experience for users.

Example 2

On the basis of the projection display system in Embodiment 1, this embodiment of the present application also provides a projection display method. It should be noted that the steps shown in the flow chart of the accompanying drawings can be implemented in a set of computer-executable instructions such as computer system, and although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

FIG. 6 is a schematic flowchart of an optional projection display method according to an embodiment of the present application. As shown in FIG. 6, the method includes at least steps S602-S606, wherein:

Step S602, acquiring a target electrical signal corresponding to the projected picture information.

Step S604, determining the target switch state and target light transmittance of each grating partition on the transmissive grating based on the target electrical signal.

Step S606, based on the target switching state and target light transmittance of each grating partition, adjust the light intensity distribution of the first light beam passing through the transmissive grating, and project the obtained incident light beam to the spatial light modulator, and the spatial light modulator is used for The outgoing light beam is modulated based on the incident light beam and the projection picture information, and the outgoing light beam is projected to the imaging module, and the imaging module is used to project the outgoing light beam to obtain the projection picture.

In some optional embodiments of the present application, after the signal processing module in the control module obtains the projection picture information, it will convert the projection picture information into a target electrical signal, and then transmit the target electrical signal synchronously to the transmission through the synchronization module. grating and spatial light modulator.

The transmissive grating includes multiple grating partitions of the same size. For any grating partition, the switch state of the grating partition can be controlled based on the projected picture information, or the light transmittance of the grating partition can be controlled based on the projected picture information to adjust the light passing through the grating. The light intensity of the partitioned beam.

After the transmissive grating acquires the target electrical signal corresponding to the projected picture information, the target switch state and the target light transmittance of each grating partition on the transmissive grating are determined based on the target electrical signal. In some optional embodiments of the present application, the complete process of realizing the projection display is as follows: the light-combining lighting module performs light-combining processing, uniform light processing, and scaling processing on the light source to obtain the first light beam; The projection picture information of the first light beam is adjusted to obtain the incident light beam; the spatial light modulator obtains the outgoing light beam based on the incident light beam and the projection picture information transmitted by the control module, and the outgoing light beam is reflected to the imaging module through the combined light illumination module ; The imaging module projects an outgoing light beam to obtain a projected image.

FIG. 7 is a schematic flowchart of another optional projection display method according to an embodiment of the present application. As shown in FIG. 7, the method includes at least steps S702-S706, wherein:

Step S702, acquiring a target electrical signal corresponding to the projected picture information.

Step S704, determining the target switch state and target light transmittance of each grating partition on the transmissive grating based on the target electrical signal.

Step S706, based on the target switching state and target light transmittance of each grating partition, adjust the light intensity distribution of the outgoing light beam passing through the transmission grating, and project the obtained second light beam to the imaging module, and the imaging module is used to project the second The light beam is used to obtain a projected picture, the outgoing light beam is modulated by the spatial light modulator based on the incident light beam and the projected picture information, and the incident light beam is the first light beam.

Wherein, after the transmissive grating acquires the target electrical signal corresponding to the projection image information, the target switch state and the target light transmittance of each grating partition on the transmissive grating are determined based on the target electrical signal. In some optional embodiments of the present application, the complete process of realizing the projection display is as follows: the light combination lighting module performs light combination processing, uniform light processing and scaling processing on the light source to obtain the first light beam; the spatial light modulator converts the first light beam As the incident light beam, based on the modulation of the incident light beam and the projection picture information transmitted by the control module, the outgoing light beam is obtained; based on the projection picture information transmitted by the control module, the transmissive grating adjusts the light intensity distribution of the outgoing light beam to obtain the second light beam; the imaging module projects the second light beam The two light beams obtain the projected picture.

In the embodiment of the present application, by matching with the screen signal (projection screen information), using an electronic control method, the grating partitions of the transmission grating are continuously switched on and off, so that the sensitivity of each area of the projection screen can be dynamically adjusted; Furthermore, by adjusting the light transmittance of each grating partition of the transmissive grating, more gray scale contrasts can be achieved, thereby improving the display quality of the entire projection screen, and further solving the problem of stray light caused by the projector during projection display. The impact leads to poor contrast of the projection screen and poor viewing experience for users. Technical problems.

Example 3

According to an embodiment of the present application, a non-volatile storage medium is also provided, the non-volatile storage medium includes a stored program, wherein, when the program is running, the device where the non-volatile storage medium is located is controlled to execute the method described in Embodiment 2. projection display method.

According to an embodiment of the present application, a processor is further provided, and the processor is configured to run a program, wherein the projection display method in Embodiment 2 is executed when the program is running.

Specifically, the following steps are implemented when the program is running: obtain the target electrical signal corresponding to the projected picture information; determine the target switch state and target light transmittance of each grating partition on the transmissive grating based on the target electrical signal; The target switch state and target light transmittance of the partitions, adjust the light intensity distribution of the first beam passing through the transmission grating, and project the obtained incident beam to the spatial light modulator. The spatial light modulator is used to The information is modulated to obtain an outgoing light beam, and the outgoing light beam is projected to an imaging module, and the imaging module is used to project the outgoing light beam to obtain a projection image.

Optionally, the following steps are implemented when the program is running: acquiring the target electrical signal corresponding to the projection screen information; determining the target switch state and target light transmittance of each grating partition on the transmissive grating based on the target electrical signal; The target switch state and target light transmittance of the grating partition, adjust the light intensity distribution of the outgoing beam passing through the transmission grating, and project the obtained second beam to the imaging module, which is used to project the second beam to obtain the projection screen , the outgoing light beam is modulated by the spatial light modulator based on the incident light beam and projection picture information, and the incident light beam is the first light beam.

According to an embodiment of the present application, there is also provided a projector, which includes the projection display system in Embodiment 1 and can implement the projection display method in Embodiment 2.

The serial numbers of the above embodiments of the present application are for description only, and do not represent the advantages and disadvantages of the embodiments.

In the above-mentioned embodiments of the present application, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed technical content can be realized in other ways. Wherein, the device embodiments described above are only illustrative. For example, the division of units can be a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into Another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of units or modules may be in electrical or other forms.

A unit described as a separate component may or may not be physically separated, and a component shown as a unit may or may not be a physical unit, that is, it may be located in one place, or may be distributed over multiple units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

If an integrated unit is implemented in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods in various embodiments of the present application. The aforementioned storage media include: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes. .

The above are only the preferred embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the principle of the application, and these improvements and modifications should also be considered as For the scope of protection of this application.

Claims (11)

1. A projection display system, comprising:

the light combination illumination module is used for carrying out light combination treatment, light homogenizing treatment and scaling treatment on the light source so as to obtain a first light beam;

the spatial light modulator is used for modulating the incident light beam and the projection picture information to obtain an emergent light beam;

the transmission grating is positioned between the light combining module and the spatial light modulator and is used for adjusting the light intensity distribution of the first light beam based on projection picture information to obtain the incident light beam; the imaging module is used for projecting the emergent light beam to obtain a projection picture; or alternatively, the first and second heat exchangers may be,

the spatial light modulator takes the first light beam as the incident light beam; the transmission type grating is positioned between the combined light irradiation module and the imaging module and is used for adjusting the light intensity distribution of the emergent light beam based on the projection picture information to obtain a second light beam; the imaging module is used for projecting the second light beam to obtain a projection picture;

and the control module is used for transmitting the projection picture information to the transmission type grating and the spatial light modulator.

2. The system of claim 1, wherein the system further comprises a controller configured to control the controller,

the transmission type grating comprises a plurality of grating partitions with the same size, and for any grating partition, the switching state of the grating partition can be controlled based on the projection picture information;

when the transmission type grating is positioned between the light combining module and the spatial light modulator, each grating partition corresponds to at least one first sub-beam in the first light beams, the grating partition allows the at least one first sub-beam to pass through in an on state, and the grating partition prohibits the at least one first sub-beam from passing through in an off state, and all the first sub-beams passing through the transmission type grating are taken as the incident light beams;

when the transmission type grating is positioned between the illumination combining module and the imaging module, each grating partition corresponds to at least one emergent sub-beam in the emergent beams, the grating partition allows the at least one emergent sub-beam to pass through in an on state, the grating partition prohibits the at least one emergent sub-beam from passing through in an off state, and all emergent sub-beams passing through the transmission type grating are used as the second beams.

3. The system of claim 2, wherein for any of the grating sections, the light transmittance of the grating section is controllable based on the projection screen information to adjust the light intensity of the at least one first sub-beam or the at least one outgoing sub-beam passing through the grating section.

4. The system of claim 1, wherein the system further comprises a controller configured to control the controller,

the spatial light modulator is: a digital micromirror element or a liquid crystal on silicon element, wherein the spatial light modulator has a plurality of mirrors thereon, each of the mirrors corresponding to one of the incident sub-beams; or alternatively, the first and second heat exchangers may be,

the spatial light modulator is: the liquid crystal display comprises a liquid crystal screen, wherein the liquid crystal screen is provided with a plurality of liquid crystal control units, and each liquid crystal control unit corresponds to one incident sub-beam in the incident light beams.

5. The system of claim 2, wherein the system further comprises a controller configured to control the controller,

when the spatial light modulator is a digital micro-mirror element or a silicon-based liquid crystal element, the number of grating partitions of the transmission grating is smaller than or equal to the number of pixels of the spatial light modulator, and the interval between any two adjacent grating partitions is smaller than the interval between two adjacent reflectors in the spatial light modulator;

when the spatial light modulator is a liquid crystal screen, the number of grating partitions of the transmission type grating is smaller than or equal to the number of pixels of the liquid crystal screen, and the interval between any two adjacent grating partitions is smaller than the interval between two adjacent liquid crystal control units in the liquid crystal screen.

6. The system of claim 4, wherein the imaging module includes an imaging lens, the spatial light modulator reflecting the outgoing light beam through the combined illumination module to the imaging lens;

when the spatial light modulator is the liquid crystal screen, the light combining illumination module comprises an X prism, and the spatial light modulator reflects the emergent light beam to the imaging lens through the X prism.

7. The system of claim 1, wherein the control module comprises:

the signal processing module is used for acquiring the projection picture information and converting the projection picture information into a target electric signal;

and the transmission module is used for transmitting the target electric signal to the transmission grating and the spatial light modulator.

8. A projection display method applied to the projection display system according to any one of claims 1 to 7, comprising:

acquiring a target electric signal corresponding to projection picture information;

determining a target switch state and a target light transmittance of each grating partition on the transmission grating based on the target electric signal;

based on the target on-off state and the target light transmittance of each grating partition, adjusting the light intensity distribution of a first light beam passing through the transmission grating, and projecting the obtained incident light beam to a spatial light modulator, wherein the spatial light modulator is used for modulating the obtained emergent light beam based on the incident light beam and the projection picture information, and projecting the emergent light beam to an imaging module, and the imaging module is used for projecting the emergent light beam to obtain a projection picture; or alternatively, the first and second heat exchangers may be,

based on the target on-off state and the target light transmittance of each grating partition, the light intensity distribution of the emergent light beam passing through the transmission grating is adjusted, the obtained second light beam is projected to an imaging module, the imaging module is used for projecting the second light beam to obtain a projection picture, the emergent light beam is modulated by the spatial light modulator based on the incident light beam and the projection picture information, and the incident light beam is the first light beam.

9. A nonvolatile storage medium, characterized in that the nonvolatile storage medium includes a stored program, wherein the program, when run, controls a device in which the nonvolatile storage medium is located to execute the projection display method of claim 8.

10. A processor for executing a program, wherein the program when executed performs the projection display method of claim 8.

11. A projector comprising the projection display system according to any one of claims 1 to 7.