CN105632384A - Projection display system and projection display method - Google Patents

Projection display system and projection display method Download PDF

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Publication number
CN105632384A
CN105632384A CN201610118184.0A CN201610118184A CN105632384A CN 105632384 A CN105632384 A CN 105632384A CN 201610118184 A CN201610118184 A CN 201610118184A CN 105632384 A CN105632384 A CN 105632384A
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China
Prior art keywords
light
light source
dmd
angle
image
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CN201610118184.0A
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Chinese (zh)
Inventor
徐爱臣
赵树斌
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Qingdao Hisense Electronics Co Ltd
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Qingdao Hisense Electronics Co Ltd
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Application filed by Qingdao Hisense Electronics Co Ltd filed Critical Qingdao Hisense Electronics Co Ltd
Priority to CN201610118184.0A priority Critical patent/CN105632384A/en
Publication of CN105632384A publication Critical patent/CN105632384A/en
Priority to US15/212,862 priority patent/US20160327783A1/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2066—Reflectors in illumination beam
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)

Abstract

The invention discloses a projection display system and a projection display method for realizing display of a higher-resolution picture on the premise of not increasing the number of DMDs. The projection display system provided by the embodiment of the invention comprises a light source system, a DMD and an imaging system, wherein the light source system is used for emitting light periodically at different angles to irradiate on the DMD; the DMD is used for receiving the light emitted by the light source system according to a corresponding relationship between angle pictures, reflecting the received light emitted by the light source system according to driving signals corresponding to any part of the picture which needs to be displayed, forming reflection light corresponding to each pixel of the part of picture and sending the reflection light to the imaging system; and the corresponding relationship between angle pictures is that an angle of the light emitted by the light source system irradiating on the DMD is corresponding to display of a part of picture which needs to be displayed.

Description

Projection display system and method
Technical Field
The invention relates to the technical field of display, in particular to a projection display system and a projection display method.
Background
A Digital Micromirror Device (DMD) is a core device in the industries of current projectors, laser televisions, etc., and is a fully digital spatial light modulator, which utilizes fast switching speed and pulse width modulation to generate accurate image color and gray scale control. The DMD surface is full of two-dimensional micromirror arrays, each micromirror is equivalent to a pixel point in a projection picture, each micromirror can deflect freely, and the micromirrors can deflect at different deflection angles to present different states. Therefore, the reflection of light is controlled by the deflection angle of each micro lens, and the real-time display of images is realized. However, the resolution of the DMD is limited by the manufacturing process, and when the resolution required for imaging is greater than the resolution limit provided by the DMD, the resolution improvement of the DMD is difficult to achieve by only the manufacturing process.
In order to realize the display of higher resolution pictures, the prior art proposes to realize the display by increasing the number of DMDs, as shown in fig. 1, the principle of which is mainly as follows: the method comprises the steps of dividing an image to be displayed (with the resolution of 4 Kx4K) into two images (with the resolution of 4 Kx2K, for example: images with 3840 x2160 pixel points and the intrinsic resolution of DMD of 4 Kx2K), and respectively transmitting the images to two DMD chips (namely, a first DMD chip 101 and a second DMD chip 102); the first DMD chip 101 and the second DMD chip 102 are enabled to work simultaneously through the DMD driving module, the LED driving module drives the lighting system to start working simultaneously, the first DMD chip 101 and the second DMD chip 102 are illuminated through the lighting system 103 to generate images, the images emitted from the second DMD chip 102 are emitted into an optical splicing module 105 (for example, a half-reflecting and half-transmitting prism) through a collimating optical system 104 in parallel, reflection images are generated on a CCD106 through a half-reflecting and half-transmitting film, the images emitted from the first DMD chip 101 are emitted into the optical splicing module 105 in parallel through the collimating optical system 104, transmission images are generated on the CCD106 through the half-reflecting and half-transmitting film, the reflection images and the transmission images are spliced together after mechanical adjustment and calibration, and the edges are fused within one pixel, so that 4 Kx 4K resolution display is achieved.
In summary, the prior art cannot utilize a single DMD of an existing specification to achieve a higher resolution display.
Disclosure of Invention
The embodiment of the invention provides a projection display system and a projection display method, which are used for realizing the display of a picture with higher resolution ratio on the premise of not increasing the number of DMDs.
The embodiment of the invention provides a projection display system, which comprises: the digital micromirror device comprises a light source system, a digital micromirror device DMD and an imaging system; wherein,
the light source system is used for periodically emitting light rays at different angles to irradiate the DMD;
the DMD is used for receiving the light emitted by the light source system according to the corresponding relation of the angle images, reflecting the received light emitted by the light source system according to a driving signal corresponding to any partial image of the image required to be displayed, forming a reflected light corresponding to each pixel of the partial image and sending the reflected light to the imaging system; the corresponding relation of the angle images is as follows: the light emitted by the light source system irradiates one angle of the DMD, and corresponds to the display of one partial image of the image to be displayed;
the imaging system is used for imaging the reflected light corresponding to each pixel of each partial image sent by the DMD in different imaging areas of a display screen according to the corresponding relation of the angle imaging areas, wherein the images of the imaging areas form a complete image; the corresponding relation of the angle imaging area is as follows: the light emitted by the light source system irradiates one angle of the DMD, and corresponds to one imaging area of the display screen.
The projection display system provided by the embodiment of the invention is directed to the display of any partial image of an image to be displayed, and according to an angle of irradiating a DMD by light rays emitted by a light source system, the display of a partial image of the image to be displayed corresponds to the display of the DMD, and an angle of irradiating the DMD by light rays emitted by the light source system corresponds to an imaging area of a display screen, the DMD receives the irradiation of light rays of a light source at a corresponding angle, and under the driving of a driving signal corresponding to the partial image, the partial image is projected to a corresponding imaging area of the display screen, and the image of each imaging area forms a complete image, so that each partial image of the image to be displayed is imaged in each determined imaging area of the display screen, and the image of each imaging area forms a complete image, and as a complete image on the display screen is formed by images projected to each imaging area by the same DMD in a time sharing manner, therefore, a higher resolution picture can be displayed without increasing the number of DMDs.
Preferably, the light source system comprises a plurality of angularly disposed light sources; the light sources are lightened according to a time sequence, and periodically emit light to irradiate the DMD; or
The light source system comprises a light source, wherein a reflector which can rotate in time sequence is arranged in a light path of the light source; the mirror has a plurality of rotational angular positions; the light source is continuously lightened, and light rays with corresponding angles are output according to any rotation angle position to irradiate the DMD.
Preferably, the imaging system comprises: the optical light-combining element and the projection lens; wherein,
the optical light combination element is used for adjusting the direction of the reflected light corresponding to each pixel of each partial image emitted by the DMD so as to enable the reflected light to be incident to different areas of the projection lens in parallel;
and the projection lens is used for focusing and imaging the reflected light rays corresponding to each pixel of each partial image emitted by the DMD after passing through the optical light combination element in different imaging areas of the display screen according to the corresponding relation of the angle imaging areas.
Preferably, when the light source system includes two first light sources and two second light sources arranged at an angle, the first light sources and the second light sources are turned on in time sequence, and light is alternately emitted to irradiate the DMD at a first angle and a second angle, respectively.
Preferably, when the light source system comprises a light source, a reflector which can rotate in time sequence is arranged in the light source light path, and the reflector has a first rotation angle position and a second rotation angle position; the light source is continuously lightened, and light rays with a first angle and light rays with a second angle are output to irradiate the DMD corresponding to the first rotating angle position and the second rotating angle position.
Preferably, any one of the light sources is a Light Emitting Diode (LED) light source or a laser light source.
Preferably, the DMD is specifically configured to receive the first-angle light source light according to the output timing sequence of the first-angle light source light and the second-angle light source light and the corresponding relationship between the angle images, and reflect the first-angle light source light according to a driving signal corresponding to a first partial image of an image to be displayed, so as to form a reflected light corresponding to each pixel of the first partial image to the imaging system; receiving light of a light source at a second angle, reflecting the light of the light source at the second angle according to a driving signal corresponding to a second partial image of the image to be displayed, and forming reflected light corresponding to each pixel of the second partial image to the imaging system; wherein the first partial image and the second partial image constitute a complete image of the image to be displayed.
Preferably, the imaging system comprises: the optical light-combining element and the projection lens; wherein,
the optical light combining element is used for changing the direction of the reflected light ray corresponding to each pixel of the first partial image emitted by the DMD and/or the reflected light ray corresponding to each pixel of the second partial image emitted by the DMD, so that the reflected light rays are incident to different areas of the projection lens in parallel;
the projection lens is used for focusing and imaging the reflected light rays corresponding to each pixel of the first partial image emitted by the DMD after passing through the optical light combination element in a first imaging area of a display screen according to the corresponding relation of the angle imaging area; according to the corresponding relation of the angle imaging area, reflected light rays corresponding to each pixel of a second partial image emitted by the DMD after passing through the optical light combination element are focused and imaged in a second imaging area of the display screen; wherein the images of the first imaging region and the second imaging region constitute a complete image.
Preferably, the system further comprises a signal processing system; the signal processing system is used for dividing the image to be displayed into at least two partial images, generating a digital signal of each partial image and respectively outputting the digital signals of each partial image to the DMD.
Preferably, the system further comprises a synchronization control device; the synchronous control device is used for generating a synchronous control signal and respectively sending the synchronous control signal to the signal processing system and the light source system; the synchronous control signal is used for controlling the time sequence of the light emitted by the light source system irradiating the DMD according to the corresponding relation of the angle images, and is synchronous with the time sequence of the digital signals of all the images output to the DMD by the signal processing system.
The time sequence that the light emitted by the light source system irradiates the DMD can be realized by arranging the synchronous control device, the time sequence is synchronous with the time sequence that the signal processing system outputs the digital signals of all the images to the DMD, and the display of a partial image of the image to be displayed corresponds to one angle that the light emitted by the light source system irradiates the DMD and corresponds to one imaging area of the display screen, so that each partial image of the image to be displayed can be accurately imaged in each determined imaging area of the display screen.
The projection display method provided by the embodiment of the invention comprises the following steps:
dividing an image to be displayed into at least two partial images and generating a digital signal of each partial image;
according to the angle of light source light irradiating a Digital Micromirror Device (DMD) and the one-to-one correspondence relationship between each part of an image to be displayed, periodically irradiating the DMD by the light source light with different angles, and respectively outputting digital signals of each part of the image to the DMD, wherein the time sequence of irradiating the DMD by the light source light with each angle is synchronous with the time sequence of respectively outputting the digital signals of each part of the image to the DMD;
imaging the reflected light corresponding to each pixel of each partial image emitted by the DMD in different imaging areas of the display screen according to the one-to-one correspondence between the angle of the light source irradiating the DMD and each imaging area of the display screen; wherein the images of the imaging regions form a complete image.
The projection display method provided by the embodiment of the invention aims at the display of any partial image of an image to be displayed, according to the one-to-one correspondence relationship between the angle of light source light irradiating a DMD and each part of the image to be displayed and the one-to-one correspondence relationship between the angle of light source light irradiating the DMD and each imaging area of a display screen, the DMD receives the irradiation of light source light of a corresponding angle, and projects the partial image to a corresponding imaging area of the display screen under the driving of a driving signal corresponding to the partial image, and the image of each imaging area forms a complete image, so that each partial image of the image to be displayed is imaged in each determined imaging area of the display screen, the image of each imaging area forms a complete image, and as the complete image on the display screen is formed by the image projected to each imaging area by the same DMD in a time-sharing manner, therefore, a higher resolution picture can be displayed without increasing the number of DMDs.
Preferably, the periodically illuminating the DMD with the light rays of the light source at different angles specifically includes: the light sources arranged at a plurality of angles are lightened according to time sequence, and light rays are emitted periodically to irradiate the DMD; or
The periodically illuminating the DMD with light from light sources at different angles specifically includes: a light source is continuously lighted, a reflector with a plurality of rotation angle positions is arranged in the light source light path, the reflector rotates according to time sequence, and light rays with a corresponding angle are output to any rotation angle position to irradiate the DMD.
Drawings
Fig. 1 is a schematic structural diagram of a display system for improving a picture resolution provided in the prior art;
fig. 2 is a schematic structural diagram of a projection display system according to an embodiment of the present invention;
FIG. 3 is a schematic view of a first variant of a projection display system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first light source system in a projection display system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a DMD in a projection display system according to an embodiment of the invention;
fig. 6(a), fig. 6(b), and fig. 6(c) are schematic views of reflected light rays of incident light in three different states at the DMD micromirror respectively according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a first imaging system of a projection display system according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a projection display system according to a second variation of the present invention;
fig. 9 is a schematic structural diagram of a second light source system in a projection display system according to an embodiment of the invention;
FIG. 10 is a schematic structural diagram of a third variation of a projection display system according to an embodiment of the invention;
fig. 11 is a schematic structural diagram of a third light source system in a projection display system according to an embodiment of the invention;
FIG. 12 is a schematic structural diagram of a fourth variation of a projection display system according to an embodiment of the invention;
FIG. 13 is a schematic diagram of a second imaging system in a projection display system according to an embodiment of the present invention;
fig. 14 is a flowchart illustrating a projection display method according to a second embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a projection display system and a projection display method, which are used for realizing the display of a picture with higher resolution ratio on the premise of not increasing the number of DMDs.
The embodiment of the invention improves the light source irradiating the DMD, the control of the light source, the drive of the DMD, an imaging system and the like on the basis of the existing single DMD projection system, so as to realize the display of a picture with higher resolution by utilizing the single DMD with the existing specification.
The imaging principles of all images imaged by the projection display system provided by the embodiment of the present invention are the same, and the imaging principles of the projection display system provided by the embodiment of the present invention are described below in terms of imaging of one image, and the imaging principles include:
firstly, dividing a sub-image to be displayed into at least two partial images, according to light source light rays with one angle irradiating the DMD, corresponding to the display of one partial image and one imaging area of a display screen, utilizing the light source light rays with different angles to alternately provide illumination for the DMD, imaging each partial image of the image to be displayed on each determined imaging area of the display screen by the same DMD in a time-sharing manner, and forming a complete image by the images of each imaging area.
The following describes examples of the present invention.
The first embodiment is as follows:
the embodiment of the invention provides a projection display system, which comprises: light source system, DMD, and imaging system.
The light source system is used for periodically emitting light rays to irradiate the DMD at different angles;
the DMD is used for receiving light rays emitted by the light source system according to the corresponding relation of the angle images, reflecting the received light rays emitted by the light source system according to a driving signal corresponding to any partial image of an image required to be displayed, forming reflected light rays corresponding to each pixel of the partial image and sending the reflected light rays to the imaging system; wherein, the corresponding relation of the angle image is as follows: the light emitted by the light source system irradiates one angle of the DMD, and corresponds to the display of one partial image of the image to be displayed;
the imaging system is used for imaging the reflected light rays corresponding to each pixel of each partial image sent by the DMD in different imaging areas of the display screen according to the corresponding relation of the angle imaging areas, wherein the images of the imaging areas form a complete image; the corresponding relation of the angle imaging area is as follows: the light emitted by the light source system irradiates an angle of the DMD, corresponding to an imaging area of the display screen.
The corresponding relation of the angle imaging area is set before the projection display system leaves factory, for example, when the first angle light source irradiates the DMD, the imaging area of the display screen corresponding to the first angle light source is the first imaging area; when the light of the second angle light source irradiates the DMD, the imaging area of the display screen corresponding to the DMD is the second imaging area.
The setting of the corresponding relationship of the angle image is based on the corresponding relationship of the angle imaging area, in order to image a certain partial image of the image to be displayed on a determined imaging area of the display screen, the corresponding DMD needs to be irradiated by a light source light ray of a determined angle, so that a corresponding relationship exists between the angle of irradiating the DMD by the light source system and the display of each partial image of the image to be displayed, for example, a first angle light source light ray corresponding to the display of a first partial image of the image to be displayed, and a second angle light source light ray corresponding to the display of a second partial image of the image to be displayed.
Preferably, the light source system comprises a plurality of angularly disposed light sources; a plurality of light sources are lightened according to time sequence, and periodically emit light to irradiate the DMD; or
The light source system comprises a light source, a reflector which can rotate according to time sequence is arranged in a light path of the light source; the mirror has a plurality of rotational angular positions; the light source is continuously lightened, and light rays with a corresponding angle are output to irradiate the DMD according to any rotation angle position; the light source may be an ultra-high pressure mercury lamp light source, a Light Emitting Diode (LED) light source, a laser light source, or the like, and preferably a laser light source.
Preferably, the imaging system comprises: the optical light-combining element and the projection lens; wherein,
the optical light combination element is used for adjusting the direction of the reflected light corresponding to each pixel of each partial image emitted by the DMD so as to enable the reflected light to be incident to different areas of the projection lens in parallel;
and the projection lens is used for focusing and imaging the reflected light rays corresponding to each pixel of each partial image emitted by the DMD after passing through the optical light combination element in different imaging areas of the display screen according to the corresponding relation of the angle imaging areas.
Of course, the projection display system described above may also preferably include a signal processing system; the signal processing system is used for dividing an image to be displayed into at least two partial images, generating a digital signal of each partial image and respectively outputting the digital signals of each partial image to the DMD.
Preferably, the projection display system may further include a synchronization control device; the synchronous control device is used for generating synchronous control signals and respectively sending the synchronous control signals to the signal processing system and the light source system; the synchronous control signal is used for controlling the time sequence of the DMD irradiated by the light rays emitted by the light source system according to the corresponding relation of the angle images, and is synchronous with the time sequence of the DMD to which the digital signals of the images of all parts are output by the signal processing system.
The synchronization control signal may be generated by another method, for example, by a system that can realize both the function of the signal processing system and the function of the synchronization control device. The embodiment of the present invention does not limit the generation manner of the synchronization control signal, as long as it can ensure that each partial image of the image to be displayed can be imaged on each determined imaging area of the display screen by the same DMD in a time-sharing manner.
Moreover, the projection display system provided by the embodiment of the invention can improve the resolution of a single dimension (for example, the width direction or the length direction) of the image, and can also improve the resolution of two dimensions (for example, the width direction and the length direction) of the image in principle, wherein the image is divided into at least four parts and has an even number of parts.
The technical solution provided by the embodiment of the present invention is described below by taking as an example that an image is divided into two parts and displayed by the projection display system provided by the embodiment of the present invention, and the projection display system includes a signal processing system and a synchronization control device.
In all the figures, the lines with arrows represent the transmission directions of light, and are not used to indicate the connection relationship.
As shown in fig. 2, an embodiment of the present invention provides a projection display system, including: signal processing system 11, light source system 12, synchronization control device 13, DMD14, and imaging system 15.
A signal processing system 11, which is used for dividing the image to be displayed into a first partial image and a second partial image and generating a digital signal of each partial image, and receiving the synchronization control signal sent by the synchronization control device 13, and respectively outputting the digital signals of the first partial image and the second partial image to the DMD14 according to the synchronization control signal; the first partial image and the second partial image are respectively one half of the image to be displayed, and the first part and the second part can be a left half part and a right half part, or an upper half part and a lower half part.
And a light source system 12 for receiving the synchronization control signal sent by the synchronization control device 13, and alternately emitting light to illuminate the DMD14 at the first angle and the second angle according to the control of the synchronization control signal.
A synchronization control device 13 for generating a synchronization control signal and transmitting the synchronization control signal to the signal processing system 11 and the light source system 12, respectively; the synchronous control signal is used for controlling the time sequence of irradiating the DMD14 by the light rays emitted by the light source system 12 according to the corresponding relation of the angle images, and is synchronous with the time sequence of outputting the digital signals of each part of the image to the DMD14 by the signal processing system 11; the corresponding relation of the angle images is as follows: the first angle light source light corresponds to display of a first partial image, and the second angle light source light corresponds to display of a second partial image.
The DMD14 is configured to receive the first-angle light source light and the digital signal of the first partial image sent by the signal processing system 11 according to the output timing of the first-angle light source light and the second-angle light source light and the corresponding relationship of the angle images, form a driving signal corresponding to the digital signal of the first partial image, reflect the first-angle light source light according to the driving signal, form a reflected light corresponding to each pixel of the first partial image, and focus and image the reflected light on the first imaging area of the display screen through the imaging system 15 (i.e., display of the first partial image); and receiving the second angle light source light and the digital signal of the second partial image sent by the signal processing system 11, and forming a driving signal corresponding to the digital signal of the second partial image, reflecting the second angle light source light according to the driving signal, and forming a reflected light corresponding to each pixel of the second partial image, wherein the reflected light is focused and imaged (i.e. the display of the second partial image) on a second imaging area of the display screen through the imaging system 15.
The imaging system 15 is used for imaging the reflected light rays corresponding to each pixel of the first partial image emitted by the DMD14 in the first imaging area of the display screen according to the corresponding relation of the angular imaging areas; imaging the reflected light corresponding to each pixel of the second partial image emitted by the DMD14 in the second imaging area of the display screen according to the corresponding relation of the angle imaging area; the images of the first imaging area and the second imaging area form a complete image; the corresponding relation of the angle imaging area is as follows: the first angle light source light corresponds to a first imaging area of the display screen, and the second angle light source light corresponds to a second imaging area of the display screen.
The structure of the projection display system in the preferred embodiment of the present invention is described below with reference to the accompanying drawings:
the first implementation mode comprises the following steps: referring to fig. 3, the projection display system includes: a signal processing system (not shown in fig. 3), a light source system 12, a synchronization control device (not shown in fig. 3), a DMD14, and an imaging system 15;
the signal processing system 11 is configured to divide an image to be displayed into a first partial image and a second partial image, generate a digital signal for each partial image, receive a synchronization control signal sent by the synchronization control device, and output the digital signals of the first partial image and the second partial image to the driving device inside the DMD14 according to the synchronization control signal; the first partial image and the second partial image are respectively one half of the image to be displayed, and the first part and the second part can be a left half part and a right half part, and can also be an upper half part and a lower half part;
as shown in fig. 4, the light source system 12 includes: a first light source 121, a second light source 122 and a light source control device 123 (not shown in fig. 3). The first light source 121 and the second light source 122 are disposed at an angle; and a light source control device 123, configured to receive the synchronization control signal sent by the synchronization control device, control the first light source 121 or the second light source 122 to light in a time sequence according to the synchronization control signal, and emit light beams alternately at a first angle and a second angle to illuminate the micromirror array of the DMD 14. The light source can be an ultra-high pressure mercury lamp light source, an LED light source, a laser light source or the like, and preferably a laser light source; both the first light source and the second light source can illuminate the DMD entirely.
A synchronization control device for generating a synchronization control signal and transmitting the synchronization control signal to the signal processing system 11 and the light source system 12, respectively; the synchronous control signal is used for controlling the time sequence of irradiating the DMD14 by the light rays emitted by the light source system 12 according to the corresponding relation of the angle images, and is synchronous with the time sequence of outputting the digital signals of each part of the image to the DMD14 by the signal processing system 11; the corresponding relation of the angle images is as follows: the first angle light source light corresponds to display of a first partial image, and the second angle light source light corresponds to display of a second partial image.
As shown in fig. 5, DMD14 includes: a driving device 141 and a micromirror array 142.
The driving device 141 is configured to receive the digital signal of the first partial image sent by the signal processing system 11 according to the output timing sequence of the first angle light source and the second angle light source and the corresponding relationship of the angle image, and form a driving signal corresponding to the digital signal of the first partial image, and according to the driving signal, control the reflection of each micromirror in the micromirror array 142 to the first angle light source to form a reflected light corresponding to each pixel of the first partial image, where the reflected light is focused and imaged (i.e. displayed in the first partial image) in the first imaging area 161 of the display screen 16 through the imaging system 15; and receiving the digital signal of the second partial image sent by the signal processing system 11, forming a driving signal corresponding to the digital signal of the second partial image, and controlling the reflection of the second angle light source light by each micromirror in the micromirror array 142 according to the driving signal to form a reflected light corresponding to each pixel of the second partial image, wherein the reflected light is focused and imaged (i.e. displayed of the second partial image) on the second imaging area 162 of the display screen 16 through the imaging system 15.
The micromirror array 142 is configured to receive the first-angle light source according to the output timing of the first-angle light source and the second-angle light source and the corresponding relationship of the angle images, and reflect the first-angle light source in response to the control of the driving device 141 to form a reflected light corresponding to each pixel of the first partial image, and the reflected light is focused and imaged (i.e. displayed of the first partial image) on the first imaging area 161 of the display screen 16 by the imaging system 15; and receives the second angle light source light and reflects the second angle light source light in response to the control of the driving device 141 to form reflected light corresponding to each pixel of the second partial image, which is focused and imaged (i.e., displayed of the second partial image) on the second imaging area 162 of the display screen 16 via the imaging system 15.
It is noted that the angle between the first angle source light and the second angle source light incident on the micromirror array of the DMD is not equal to 48 degrees (provided that the deflection angle of the micromirror in the micromirror array of the DMD is 12 degrees). The reason for this will be described below with reference to fig. 6(a), 6(b), and 6 (c):
any micromirror in the micromirror array on the DMD can be in three states according to different deflection angles: flat state (as shown in fig. 6 (a)), ON state (as shown in fig. 6 (b)), and OFF state (as shown in fig. 6 (c)). When the micro-mirror is not deflected, namely in a Flat state; when the micromirror is deflected by +12 °, it is in the ON state; when the micromirror deflects-12 deg., it is in the OFF state. When a certain light ray is incident on the micromirror at an arbitrary angle, the angle between the reflected light ray deflected by +12 ° by the micromirror and the reflected light ray deflected by-12 ° by the micromirror is 48 degrees according to the principle of light reflection. DMD projection systems typically image with reflected light in the ON state and reflected light in the OFF state not used, typically absorbing reflected light in the OFF state with a light absorber, assuming that the light from both sources is incident ON the micromirror array of the DMD at different angles, and the angle between the first angle source light and the second angle source light is equal to 48 degrees, according to the principle of light reflection, the reflected light of one angle light source deflected by-12 deg. at the micro mirror is the same as the reflected light of another angle light source deflected by +12 deg. at the micro mirror, and the reflected light in this direction is absorbed, that is, the reflected light of an angular light source light beam deflected by +12 ° at the micromirror is absorbed, and thus affects the image formation, the angle between the first angle source light and the second angle source light incident on the micromirror array of the DMD is not equal to 48 degrees.
As shown in fig. 7, the imaging system 15 includes: an optical light combining element 134 and a projection lens 135.
The optical light combining element 134 is configured to change a direction of a reflected light ray corresponding to each pixel of the first partial image emitted by the DMD14 and/or a direction of a reflected light ray corresponding to each pixel of the second partial image emitted by the DMD14, so that the reflected light rays are incident in parallel to different areas of the projection lens 135;
a projection lens 135, configured to focus and image (i.e., display the first partial image) the reflected light corresponding to each pixel of the first partial image emitted by the DMD14 after passing through the optical combiner 134 in the first imaging region 161 of the display screen 16 according to the corresponding relationship of the angular imaging regions, and focus and image (i.e., display the second partial image) the reflected light corresponding to each pixel of the second partial image emitted by the DMD14 after passing through the optical combiner 134 in the second imaging region 162 of the display screen 16 according to the corresponding relationship of the angular imaging regions, where the images of the first imaging region 161 and the second imaging region 162 form a complete image; the corresponding relation of the angle imaging area is as follows: the first angle light source light corresponds to a first imaging area of the display screen, and the second angle light source light corresponds to a second imaging area of the display screen.
The second embodiment: referring to fig. 8, the difference between the projection display system and the projection display system provided in the first embodiment is a light source system 12, and other structures that are the same as those in the first embodiment are not repeated herein, and the following describes the structure of the light source system 12 in the projection display system provided in the second embodiment with reference to fig. 8:
as shown in fig. 9, the light source system 12 includes a light source 126, a mirror 127 disposed in the optical path of the light source 126 and rotatable in time series, and a light source control device (not shown in fig. 8 and 9); the mirror 127 has a first rotational angular position and a second rotational angular position; the light source 126 is continuously turned on and outputs light rays of a first angle and light rays of a second angle to illuminate the DMD14 corresponding to the first rotation angle position and the second rotation angle position; the light source control device is used for receiving the synchronous control signal sent by the synchronous control device and controlling the reflector 127 to rotate to a first rotation angle position or a second rotation angle position according to the synchronous control signal; the light source may be an ultra-high pressure mercury lamp light source, an LED light source, a laser light source, or the like, and preferably a laser light source.
The third embodiment is as follows: referring to fig. 10, the difference between the projection display system and the projection display system provided in the first embodiment is a light source system 12, and other structures that are the same as those in the first embodiment are not repeated herein, and the following describes the structure of the light source system 12 in the projection display system provided in the third embodiment with reference to fig. 10:
as shown in fig. 11, the light source system 12 includes a first light source 121, a second light source 122, a half-black and half-white color wheel 124, a light source control device 123 (not shown in fig. 10), and a first optical element 125;
the emergent light beams of the first light source 121 and the second light source 122 are irradiated onto the half-black and half-white color wheel 124 in parallel; the light source control device 123 is configured to receive a synchronization control signal sent by the synchronization control device, and control the half-black and half-white color wheel 124 to rotate in time sequence according to the synchronization control signal, so that the emergent light beams of the first light source 121 and the second light source 122 are respectively and alternately irradiated onto the micromirror array of the DMD14 at a first angle and a second angle; a half-black half-white color wheel for preventing the outgoing light of the first light source or the second light source from passing through the half-black half-white color wheel 124 in response to the control of the light source control device 123 so that only the light of one light source can be irradiated to the DMD at the same time; a first optical element 125 (e.g., a prism or a mirror) for changing the direction of the outgoing light of the second light source 122 transmitted through the half-black and half-white color wheel 124, so that the changed direction of the outgoing light of the second light source 122 and the outgoing light of the first light source 121 irradiate onto the micromirror array of the DMD14 at different angles; the light source can be an ultra-high pressure mercury lamp light source, an LED light source, a laser light source or the like, and preferably a laser light source; both the first light source and the second light source can illuminate the DMD.
Of course, the first optical element 125 may also be used to change the direction of the outgoing light of the first light source 121 transmitted through the half-black and half-white color wheel 124, so that the outgoing light of the first light source 121 after changing the direction and the outgoing light of the second light source 122 irradiate onto the micromirror array of the DMD14 at different angles.
The fourth embodiment: referring to fig. 12, the projection display system is different from the projection display system provided in the first embodiment in an imaging system 15, and other structures that are the same as those in the first embodiment are not described again, and the following describes the structure of the imaging system 15 in the projection display system provided in the fourth embodiment with reference to fig. 12:
as shown in fig. 13, the imaging system 15 includes: a second optical element 131, a first projection lens 132, and a second projection lens 133.
The second optical element 131 (which may be a prism or a mirror, for example) is configured to change the direction of the reflected light corresponding to each pixel of the second partial image emitted by the DMD14, so that the direction of the reflected light corresponding to each pixel of the second partial image emitted by the DMD14 after the change of the direction of the incident light to the second projection lens 133 is parallel to the direction of the reflected light corresponding to each pixel of the first partial image emitted by the DMD14 incident to the first projection lens 132; a first projection lens 132, configured to focus and image (i.e., display the first partial image) the reflected light corresponding to each pixel of the first partial image emitted by the DMD14 in the first imaging area 161 of the display screen 16 according to the corresponding relationship between the angular imaging areas; a second projection lens 133, configured to focus and image (i.e., display the second partial image) the reflected light corresponding to each pixel of the second partial image emitted by the DMD14 with the changed direction in a second imaging area 162 of the display screen 16 according to the corresponding relationship between the angle imaging areas; wherein, the images of the first imaging region 161 and the second imaging region 162 constitute a complete image; the corresponding relation of the angle imaging area is as follows: the first angle light source light corresponds to a first imaging area of the display screen, and the second angle light source light corresponds to a second imaging area of the display screen.
Of course, the second optical element 131 may be configured to change the direction of the reflected light beam corresponding to each pixel of the first partial image emitted from the DMD14 such that the direction of the reflected light beam corresponding to each pixel of the first partial image emitted from the DMD14 after the direction change incident on the first projection lens 132 is parallel to the direction of the reflected light beam corresponding to each pixel of the second partial image emitted from the DMD14 incident on the second projection lens 133.
It should be noted that the projection display system provided by the embodiment of the present invention needs to perform image stitching calibration in advance before leaving the factory, and the projection display system using two projection lenses for focusing and imaging needs to perform image stitching calibration when being used for the first time.
Further, assuming that the DMD is at a resolution of 4K × 2K, it is understood that the DMD has 4K × 2K tiny mirrors, each corresponding to one pixel in the image. The resolution of the image picture imaged by the existing single DMD projection system is 4 Kx 2K, while the resolution of the image picture imaged by the projection display system provided by the embodiment of the invention is 8 Kx 2K when the image picture is spliced left and right, and is 4 Kx 4K when the image picture is spliced up and down, namely the resolution of the image picture with one-way dimension is improved.
Example two:
as shown in fig. 14, a projection display method provided in an embodiment of the present invention includes the following steps:
s11, dividing the image to be displayed into at least two partial images and generating a digital signal of each partial image;
s12, periodically irradiating the DMD by light source light rays with different angles according to the angle of the light source light rays irradiating the DMD and the one-to-one corresponding relation between each part of the image to be displayed, and respectively outputting the digital signals of each part of the image to the DMD, wherein the time sequence of irradiating the DMD by the light source light rays with each angle is synchronous with the time sequence of respectively outputting the digital signals of each part of the image to the DMD;
s13, according to the angle of the light source irradiating the DMD and the one-to-one correspondence between the imaging areas of the display screen, imaging the reflected light corresponding to each pixel of each partial image emitted by the DMD in different imaging areas of the display screen; wherein the images of the imaging regions form a complete image.
The angle of the light source illuminating the DMD corresponds to each portion of the image to be displayed, that is, the angle image.
The angle of the light source irradiating the DMD corresponds to each imaging region of the display screen, that is, the angle imaging region corresponds to each other.
It should be noted that the images of the imaging regions form a complete image, and the images of the imaging regions can be spliced into a complete image by an image splicing method in the prior art.
Preferably, the light of the light source at different angles periodically illuminates the DMD, and the light of the light source at multiple angles periodically illuminates the DMD; the DMD may be configured such that a single light source is continuously turned on, a mirror having a plurality of rotation angle positions is provided in the light source path, the mirror rotates in time series, and light of a corresponding angle is output for any one of the rotation angle positions to irradiate the DMD; of course, the periodic illumination of the DMD with light from the light source at different angles may be achieved in other ways. Any of the light sources may be an ultra-high pressure mercury lamp light source, an LED light source, a laser light source, or the like, preferably a laser light source.
All the working processes of image display by the projection display method provided by the embodiment of the invention are similar, and specifically, the steps of the projection display method provided by the embodiment of the invention are described as follows by displaying a frame of image divided into two parts:
the method comprises the following steps: dividing an image to be displayed into two partial images (namely a first partial image and a second partial image) and generating a digital signal of each partial image; the first partial image and the second partial image are respectively one half of the image to be displayed, and the first part and the second part can be a left half part and a right half part, and can also be an upper half part and a lower half part;
step two: the DMD is irradiated by first-angle light source light, digital signals of the first partial image are output to the DMD, and reflected light corresponding to each pixel of the first partial image sent by the DMD is imaged in a first imaging area of the display screen;
step three: the light of the light source with the second angle irradiates the DMD, meanwhile, digital signals of the second partial image are output to the DMD, and reflected light corresponding to each pixel of the second partial image sent by the DMD is imaged in a second imaging area of the display screen; wherein the images of the first imaging area and the second imaging area constitute a complete image.
In summary, according to the technical solution provided by the embodiments of the present invention, for displaying any partial image of an image to be displayed, according to an angle at which light emitted by a light source system illuminates a DMD, a partial image corresponding to the image to be displayed is displayed, and an angle at which light emitted by the light source system illuminates the DMD corresponds to an imaging area of a display screen, the DMD receives illumination of light from the light source at a corresponding angle, and under driving of a driving signal corresponding to the partial image, the partial image is projected onto a corresponding imaging area of the display screen, and the image of each imaging area forms a complete image, so that each partial image of the image to be displayed is imaged in each determined imaging area of the display screen, and the image of each imaging area forms a complete image, and as a complete image on the display screen is formed by images that are time-divisionally projected onto each imaging area by the same DMD, therefore, a higher resolution picture can be displayed without increasing the number of DMDs.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (12)

1. A projection display system, comprising: the digital micromirror device comprises a light source system, a digital micromirror device DMD and an imaging system; wherein,
the light source system is used for periodically emitting light rays at different angles to irradiate the DMD;
the DMD is used for receiving the light emitted by the light source system according to the corresponding relation of the angle images, reflecting the received light emitted by the light source system according to the driving signal corresponding to any partial image of the image required to be displayed, and forming reflected light corresponding to each pixel of the partial image to the imaging system; the corresponding relation of the angle images is as follows: the light emitted by the light source system irradiates one angle of the DMD, and corresponds to the display of one partial image of the image to be displayed;
the imaging system is used for imaging the reflected light corresponding to each pixel of each partial image sent by the DMD in different imaging areas of the display screen according to the corresponding relation of the angle imaging areas; wherein the images of the imaging regions form a complete image; the corresponding relation of the angle imaging area is as follows: the light emitted by the light source system irradiates one angle of the DMD, and corresponds to one imaging area of the display screen.
2. A projection display system according to claim 1, wherein the light source system comprises a plurality of angularly disposed light sources; the light sources are lightened according to a time sequence, and periodically emit light to irradiate the DMD; or
The light source system comprises a light source, wherein a reflector which can rotate in time sequence is arranged in a light path of the light source; the mirror has a plurality of rotational angular positions; the light source is continuously lightened, and light rays with corresponding angles are output according to any rotation angle position to irradiate the DMD.
3. The projection display system of claim 1 wherein the imaging system comprises: the optical light-combining element and the projection lens; wherein,
the optical light combination element is used for adjusting the direction of the reflected light corresponding to each pixel of each partial image emitted by the DMD so as to enable the reflected light to be incident to different areas of the projection lens in parallel;
and the projection lens is used for focusing and imaging the reflected light rays corresponding to each pixel of each partial image emitted by the DMD after passing through the optical light combination element in different imaging areas of the display screen according to the corresponding relation of the angle imaging areas.
4. A projection display system according to claim 2, wherein when the light source system comprises two first and second light sources arranged at an angle, the first and second light sources are illuminated in time sequence to alternately emit light to illuminate the DMD at the first and second angles, respectively.
5. A projection display system according to claim 2, when the light source system comprises a light source, a mirror rotatable in time series is provided in the light source path, and the mirror has a first rotational angle position and a second rotational angle position; the light source is continuously lightened, and light rays with a first angle and light rays with a second angle are output to irradiate the DMD corresponding to the first rotating angle position and the second rotating angle position.
6. A projection display system as claimed in claim 2, 4 or 5, wherein any of the light sources is a light emitting diode, LED, light source or a laser light source.
7. The projection display system according to claim 4 or 5, wherein the DMD is specifically configured to receive the first-angle light source light according to the output timing sequence of the first-angle light source light and the second-angle light source light and the corresponding relationship between the angle images, and reflect the first-angle light source light according to the driving signal corresponding to the first partial image of the image to be displayed, so as to form a reflected light corresponding to each pixel of the first partial image to the imaging system; receiving light of a light source at a second angle, reflecting the light of the light source at the second angle according to a driving signal corresponding to a second partial image of the image to be displayed, and forming reflected light corresponding to each pixel of the second partial image to the imaging system; wherein the first partial image and the second partial image constitute a complete image of the image to be displayed.
8. The projection display system of claim 7 wherein the imaging system comprises: the optical light-combining element and the projection lens; wherein,
the optical light combining element is used for changing the direction of the reflected light ray corresponding to each pixel of the first partial image emitted by the DMD and/or the reflected light ray corresponding to each pixel of the second partial image emitted by the DMD, so that the reflected light rays are incident to different areas of the projection lens in parallel;
the projection lens is used for focusing and imaging the reflected light rays corresponding to each pixel of the first partial image emitted by the DMD after passing through the optical light combination element in a first imaging area of a display screen according to the corresponding relation of the angle imaging area; according to the corresponding relation of the angle imaging area, reflected light rays corresponding to each pixel of a second partial image emitted by the DMD after passing through the optical light combination element are focused and imaged in a second imaging area of the display screen; wherein the images of the first imaging region and the second imaging region constitute a complete image.
9. The projection display system of claim 1, further comprising a signal processing system; the signal processing system is used for dividing the image to be displayed into at least two partial images, generating a digital signal of each partial image and respectively outputting the digital signals of each partial image to the DMD.
10. A projection display system according to claim 9, characterized in that the system further comprises synchronization control means; the synchronous control device is used for generating a synchronous control signal and respectively sending the synchronous control signal to the signal processing system and the light source system; the synchronous control signal is used for controlling the time sequence of the light emitted by the light source system irradiating the DMD according to the corresponding relation of the angle images, and is synchronous with the time sequence of the digital signals of all the images output to the DMD by the signal processing system.
11. A method of projection display, the method comprising:
dividing an image to be displayed into at least two partial images and generating a digital signal of each partial image;
according to the angle of light source light irradiating a Digital Micromirror Device (DMD) and the one-to-one correspondence relationship between each part of an image to be displayed, periodically irradiating the DMD by the light source light with different angles, and respectively outputting digital signals of each part of the image to the DMD, wherein the time sequence of irradiating the DMD by the light source light with each angle is synchronous with the time sequence of respectively outputting the digital signals of each part of the image to the DMD;
imaging the reflected light corresponding to each pixel of each partial image emitted by the DMD in different imaging areas of the display screen according to the one-to-one correspondence between the angle of the light source irradiating the DMD and each imaging area of the display screen; wherein the images of the imaging regions form a complete image.
12. The method of claim 11, wherein the periodically illuminating the DMD with light from the light source at different angles comprises: the light sources arranged at a plurality of angles are lightened according to time sequence, and light rays are emitted periodically to irradiate the DMD; or
The periodically illuminating the DMD with light from light sources at different angles specifically includes: a light source is continuously lighted, a reflector with a plurality of rotation angle positions is arranged in the light source light path, the reflector rotates according to time sequence, and light rays with a corresponding angle are output to any rotation angle position to irradiate the DMD.
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Application publication date: 20160601