CN110351539B - Projection display apparatus - Google Patents
Projection display apparatus Download PDFInfo
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- CN110351539B CN110351539B CN201910609205.2A CN201910609205A CN110351539B CN 110351539 B CN110351539 B CN 110351539B CN 201910609205 A CN201910609205 A CN 201910609205A CN 110351539 B CN110351539 B CN 110351539B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/18—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical projection, e.g. combination of mirror and condenser and objective
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- 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
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- 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]
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- 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]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3155—Modulator illumination systems for controlling the light source
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- Optics & Photonics (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Abstract
A projection display apparatus comprising a light source, control means, a spatial light modulator, a projection lens and a light absorbing element, wherein: the light source is used for emitting light source light, and the light source light comprises three primary color light source lights; the control device is used for sending a driving signal to the spatial light modulator; the spatial light modulator is used for modulating the light source light according to the driving signal to form image light and non-image light, the image light is output to the projection lens, and the non-image light is output to the light absorption element; the projection lens is used for projecting image light to form an image; the light absorbing element is used for absorbing non-image light; under the condition that the image signal is abnormally obtained, the control device controls the light source to close any one or two of the three primary color light source lights in a color image frame modulation period. The projection display device can reduce the non-image light output to the light absorbing element, thereby prolonging the service life of the light absorbing element and reducing the maintenance cost of the projection display device.
Description
Technical Field
The invention relates to the field of projection display, in particular to projection display equipment.
Background
The projection display equipment projects and displays a video image signal input by external equipment or a video image signal transmitted by a network into a corresponding image; alternatively, the projection display device projects and displays a corresponding image based on the image data stored in the local storage device.
The spatial light modulator plays an important role in the projection display apparatus projecting a display image. The spatial light modulator modulates the light source light into image light for forming an image, the ratio of the image light to the light source light depends on image data according to the spatial light modulator in the modulation process, and non-image light other than the image light is generally formed in the image modulation process. If the non-image light is not absorbed, it may be repeatedly reflected and emitted from the projection lens, which may affect the contrast of the image. Therefore, in an appropriate position of the internal space of the projection display device, for example, on the inner wall of the housing of the projection display device, or on the exit optical path of the non-image light formed by the spatial light modulator, a light absorbing element is disposed to absorb the non-image light. However, the light absorbing element ages over time, the absorption is reduced, and it needs to be replaced periodically, which results in high maintenance costs.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a projection display device with reduced cost.
A projection display apparatus comprising a light source, control means, a spatial light modulator, a projection lens and a light absorbing element, wherein:
the light source is used for emitting light source light, and the light source light comprises three primary color light source lights;
the control device is used for sending a driving signal to the spatial light modulator;
the spatial light modulator is used for modulating the light source light according to the driving signal to form image light and non-image light, the image light is output to the projection lens, and the non-image light is output to the light absorbing element;
the projection lens is used for projecting the image light to form an image;
the light absorbing element is used for absorbing the non-image light;
under the condition that the image signal is abnormally obtained, the control device controls the light source to close any one or two of the three primary color light source lights in a color image frame modulation period.
In this embodiment, under the abnormal condition of image signal acquisition, one or two kinds of primary color light source light are turned off in one frame of image modulation period, and compared with the case of not turning off any one kind of primary color light source light, the non-image light output to the light absorbing element can be reduced, so that the service life of the light absorbing element can be prolonged, and the maintenance cost of the projection display device can be reduced.
In one embodiment, the light source comprises:
a first light source for emitting light of a first primary color, a second light source for emitting light of a second primary color, and a third light source for emitting light of a third primary color;
the step of controlling the light source to turn off any one or two of the three primary color light source lights by the control device in a color image frame modulation period comprises: the control device controls to turn off any one or two of the first light source, the second light source and the third light source in a color image frame modulation period;
wherein the light source not turned off among the first, second and third light sources continuously emits light during a color image frame modulation period.
In one embodiment, the light source comprises:
a first light source for emitting light of a first primary color, a second light source for emitting light of a second primary color, and a third light source for emitting light of a third primary color;
a color image frame modulation period is divided into three types of time periods which are mutually connected and are not overlapped: a first type of time period for the first light source to emit light, a second type of time period for the second light source to emit light, and a third type of time period for the third light source to emit light;
the step of controlling the light source to turn off any one or two of the three primary color light source lights by the control device in a color image frame modulation period comprises: in a color image frame modulation period, the control device controls to turn off any one or two of the first light source, the second light source and the third light source in the corresponding time period of the three types of time periods.
In one embodiment, a color image frame modulation period is divided into three types of time periods that are contiguous and non-overlapping: a first type time period, a second type time period and a third type time period;
the light source is configured to emit a first primary light source light during the first type of time period, a second primary light source light during the second type of time period, and a third primary light source light during the third type of time period;
the step of controlling the light source to turn off any one or two of the three primary color light source lights by the control device in a color image frame modulation period comprises:
the control device turns off the light source during any one or two of the three types of time periods during a color image frame modulation period.
In one embodiment, in the event of an image signal acquisition abnormality, the control device issues a drive signal to the spatial light modulator so that the spatial light modulator modulates the image light and the non-image light formed by the light source light, satisfying the following relationship: the ratio of the image light to the light source light is larger than the ratio of the non-image light to the light source light, so that an information prompt image with a bright background is formed to reduce the light output to the light absorbing element.
In one embodiment, in an external image source playing mode, the control device sends a driving signal to the spatial light modulator according to an image signal received by a signal receiving interface to form an image corresponding to the received image signal;
the image signal acquisition abnormal condition includes: in the display mode of the external image source, the signal receiving interface does not receive the image signal or the image signal receiving of the signal receiving interface is in a buffer state.
In one embodiment, in the local image source display mode, the control device generates an image signal according to locally stored image data to be displayed, and sends a driving signal to the spatial light modulator according to the generated image signal to form an image corresponding to the generated image signal;
the image signal acquisition abnormal condition includes: and in the local image source display mode, generating an image signal according to the locally stored image data to be displayed, wherein the process is abnormal.
A projection display apparatus comprising a light source, control means, a spatial light modulator, a projection lens and a light absorbing element, wherein:
the light source is used for emitting light source light;
the control device is used for sending a driving signal to the spatial light modulator;
the spatial light modulator is used for modulating the light source light according to the driving signal to form image light and non-image light, the image light is output to the projection lens, and the non-image light is output to the light absorbing element;
the projection lens is used for projecting the image light to form an image;
the light absorbing element is used for absorbing the non-image light;
and under the condition that the image signal is abnormal, the control device is also used for controlling the light source to be turned on and off according to a preset frequency, so that the frame rate of an image formed by the image light projected by the projection lens is smaller than the image display frame rate under the condition that the image signal is normal.
In this embodiment, the light source is turned off in some time periods, so that a frame rate of an image formed by image light projected by the projection lens is smaller than an image display frame rate in a normal case of image signal acquisition, which reduces output of the image light on one hand and correspondingly reduces output of non-image light on the other hand, thereby reducing non-image light output to the light absorbing element, prolonging a service life of the light absorbing element, and reducing a maintenance cost of the projection display device.
In one embodiment, in the event of an image signal acquisition abnormality, the control device issues a drive signal to the spatial light modulator so that the spatial light modulator modulates the image light and the non-image light formed by the light source light, satisfying the following relationship: the ratio of the image light to the light source light is larger than the ratio of the non-image light to the light source light, so that an information prompt image with a bright background is formed to reduce the light output to the light absorbing element.
In one embodiment, in an external image source playing mode, the control device sends a driving signal to the spatial light modulator according to an image signal received by a signal receiving interface to form an image corresponding to the received image signal;
the image signal acquisition abnormal condition includes: in the display mode of the external image source, the signal receiving interface does not receive the image signal or the image signal receiving of the signal receiving interface is in a buffer state.
In one embodiment, in the local image source display mode, the control device generates an image signal according to locally stored image data to be displayed, and sends a driving signal to the spatial light modulator according to the generated image signal to form an image corresponding to the generated image signal;
the image signal acquisition abnormal condition includes: and in the local image source display mode, generating an image signal according to the locally stored image data to be displayed, wherein the process is abnormal.
A projection display apparatus comprising a light source, control means, a spatial light modulator, a projection lens and a light absorbing element, wherein:
the light source is used for emitting light source light;
the control device is used for sending a driving signal to the spatial light modulator;
the spatial light modulator is used for modulating the light source light according to the driving signal to form image light and non-image light, the image light is output to the projection lens, and the non-image light is output to the light absorbing element;
the projection lens is used for projecting the image light to form an image;
the light absorbing element is used for absorbing the non-image light;
in one or both of an abnormal image signal acquisition state and a standby mode, the control device sends a drive signal to the spatial light modulator so that the spatial light modulator modulates image light and non-image light formed by the light source light, and satisfies the following relationship: the ratio of the image light to the light source light is larger than the ratio of the non-image light to the light source light, so that an information prompt image with a bright background is formed to reduce the light output to the light absorbing element.
The projection display device outputs the information prompt image of bright background under the condition of abnormal image signal acquisition or in the standby mode, so that the non-image light output to the light absorbing element is less, the service life of the light absorbing element can be prolonged relative to the condition of outputting the information prompt image of dark background, and the maintenance cost of the projection display device is reduced.
In one embodiment, in an external image source playing mode, the control device sends a driving signal to the spatial light modulator according to an image signal received by a signal receiving interface to form an image corresponding to the received image signal;
the image signal acquisition abnormal condition includes: in the display mode of the external image source, the signal receiving interface does not receive the image signal or the image signal receiving of the signal receiving interface is in a buffer state.
In one embodiment, in the local image source display mode, the control device generates an image signal according to locally stored image data to be displayed, and sends a driving signal to the spatial light modulator according to the generated image signal to form an image corresponding to the generated image signal;
the image signal acquisition abnormal condition includes: and in the local image source display mode, generating an image signal according to the locally stored image data to be displayed, wherein the process is abnormal.
In one embodiment, the bright background information cue image comprises a bright background standby image; in the standby mode, the control device is used for sending a driving signal to the spatial light modulator when the duration of a time period in which no input instruction is detected exceeds a threshold value, so that the spatial light modulator modulates the light source light to form a standby image of the bright background;
and/or the presence of a gas in the gas,
the information indicative of a bright background image comprises: a menu interface image with a bright background; in the standby mode, the control device is configured to send a driving signal to the spatial light modulator when an input instruction is detected, so that the spatial light modulator modulates the light source light to form a bright background menu interface image corresponding to the detected input instruction.
In one embodiment, the light source light emitted by the light source comprises three primary color light source lights;
and during the period of forming the information prompt image of the bright background, the control device controls the light source to turn off any one or two of the three primary color light source lights in one frame of image modulation period.
In one embodiment, the light source comprises:
a first light source for emitting light of a first primary color, a second light source for emitting light of a second primary color, and a third light source for emitting light of a third primary color;
the step of controlling the light source to turn off any one or two of the three primary color light source lights by the control device in a color image frame modulation period comprises: the control device controls to turn off any one or two of the first light source, the second light source and the third light source in a color image frame modulation period;
wherein the light source not turned off among the first, second and third light sources continuously emits light during a color image frame modulation period.
In one embodiment, the light source comprises:
a first light source for emitting light of a first primary color, a second light source for emitting light of a second primary color, and a third light source for emitting light of a third primary color;
a color image frame modulation period is divided into three types of time periods which are mutually connected and are not overlapped: a first type of time period for the first light source to emit light, a second type of time period for the second light source to emit light, and a third type of time period for the third light source to emit light;
the step of controlling the light source to turn off any one or two of the three primary color light source lights by the control device in a color image frame modulation period comprises: in a color image frame modulation period, the control device controls to turn off any one or two of the first light source, the second light source and the third light source in the corresponding time period of the three types of time periods.
In one embodiment, a color image frame modulation period is divided into three types of time periods that are contiguous and non-overlapping: a first type time period, a second type time period and a third type time period;
the light source is configured to emit a first primary light source light during the first type of time period, a second primary light source light during the second type of time period, and a third primary light source light during the third type of time period;
the step of controlling the light source to turn off any one or two of the three primary color light source lights by the control device in a color image frame modulation period comprises:
the control device turns off the light source during any one or two of the three types of time periods during a color image frame modulation period.
In one embodiment, in the case of abnormal image signal acquisition, the control device is further configured to control the light source to be turned on and off at a preset frequency, so that the frame rate of an image formed by image light projected by the projection lens is smaller than the image display frame rate in the case of normal image signal acquisition.
Drawings
FIG. 1 is a schematic diagram showing a configuration of a projection display apparatus in one embodiment;
fig. 2 shows a schematic control flow diagram of the control device 60 for the light source 10 in one embodiment;
fig. 3 shows a schematic control flow diagram of the control device 60 for the light source 10 in one embodiment;
FIG. 4 shows a schematic control flow diagram of the control apparatus 60 for the spatial light modulator 30 in one embodiment;
FIG. 5 shows a schematic control flow diagram of the control apparatus 60 for the spatial light modulator 30 in one embodiment;
fig. 6 shows a control flow diagram of the control device 60 for the spatial light modulator 30 in an embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a projection display device according to an embodiment of the present invention. As shown in fig. 1, in one embodiment, the projection display device includes a light source 10, a relay system 20, a spatial light modulator 30, a projection lens 40, a light absorbing element 50 and a control device 60, a signal receiving interface 70, and a storage device 80. Wherein:
the light source 10 emits a light beam (hereinafter referred to as light source light). The light source 10 is driven by the control device 60 to be turned on and off. The relay system 20 condenses the light source light toward the spatial light modulator 30; the spatial light modulator operates under the drive of the control device 60, and the source light condensed to the spatial light modulator 30 forms image light and non-image light under the operation of the spatial light modulator 30. For example, the spatial light modulator 30 is a DMD (digital micromirror device) which is composed of a digital micromirror array, each micromirror constitutes a modulation unit, and one modulation unit is used for modulating an image corresponding to one pixel. Each micromirror flips under the driving of a driving signal. The flipped micromirrors reflect the source light to form image light and non-image light. The number of flips of each micromirror is determined by the driving signal, which in turn determines the ratio of the image light to the non-image light formed. The image light is output to the projection lens 40; the non-image light is output to the light absorbing element 50. The projection lens 40 projects image light to form an image; the light absorbing element 50 absorbs at least a portion of the non-image light. The light absorbing element 50 may be disposed on an inner wall of a housing of the projection display device, or the light absorbing element 50 may be disposed on an exit optical path of the non-image light exiting the spatial light modulator 30.
The control device 60 includes a controller 602, a light source driving circuit 604, an image conversion unit 606, a display encoder 608, a display driver 610, and an image decompression unit 612; the controller 602 controls the operations of the light source driving circuit 604, the image converter 606, the display encoder 608, the display driver 610, and the image decoder 612, and the respective circuits of the controller 602, the light source driving circuit 604, the image converter 606, the display encoder 608, the display driver 610, and the image decoder 612 perform data communication via the system bus SB.
The light source driving circuit 604 is used for driving the light source 10 to turn on and off.
In the external image source playing mode, the signal receiving interface 70 receives an image signal transmitted by an external device, or the signal receiving interface 70 receives an image signal transmitted by a network side. The control device 60 sends a driving signal to the spatial light modulator 30 according to the image signal received by the signal receiving interface to form an image corresponding to the received image signal. The image signal is converted by the image conversion unit 606 in a format suitable for display, and is further output to the display encoder 608. The display encoder 608 generates a video signal from an input image signal and outputs the video signal to the display driver 610; the display driver 610 generates a drive signal to drive the spatial light modulator 30 according to the video signal. In one embodiment, the external image source playing mode may be started by the control device 60 after receiving a preset input command, and the input command may be received by a command receiving portion (not shown); alternatively, the external image source playing mode may be started by the control device 60 after a signal data line for transmitting an image signal is inserted into an input connection portion (not shown).
In the local image source display mode, the control device 60 generates an image signal according to locally stored image data to be displayed, and transmits a driving signal to the spatial light modulator 30 according to the generated image signal to form an image corresponding to the generated image signal. The image decompression section 612 reads and decompresses the image data stored in the storage device 80, and transmits the decompressed image data to the image conversion section 606. The storage device 80 may be a detachable memory card or a removable hard disk, or may be other forms of storage devices, etc. The image conversion unit 606 generates an image signal from the image data and in a format suitable for display, and further outputs the image signal to the display encoder 608. The display encoder 608 generates a video signal from an input image signal and outputs the video signal to the display driver 610; the display driver 610 generates a drive signal to drive the spatial light modulator 30 according to the video signal. In one embodiment, the local image source display mode may be turned on by the control device 60 after receiving a preset input command, which may be received by a command receiving part (not shown). For example, after receiving an instruction to play a locally stored video, or after receiving an instruction to play a locally stored PPT, or after receiving an instruction to play an album, or the like, the control device 60 turns on the local image source display mode.
In one embodiment, in the external image source display mode, the signal receiving interface 70 does not receive the image signal, which is an abnormal image signal acquisition condition. In one embodiment, in the external image source display mode, the image signal received by the signal receiving interface 70 is in a buffered state, for example, the transmission rate of the image signal is slow, and the received image signal is not sufficient to smoothly display the corresponding video, which is also an image signal acquisition abnormal condition. In the external image source display mode, the image signal received by the signal receiving interface 70 is not interrupted and the transmission speed of the image signal is fast enough (the image signal is received at the preset frame rate) so that the corresponding video can be displayed smoothly, which is the normal case of image signal acquisition. In one embodiment, when the signal receiving interface 70 does not receive the image signal, the control device 60 controls the spatial light modulator 30 to perform the image modulation operation to form the information prompt image for indicating no signal input. In one embodiment, when the image signal reception of the signal receiving interface 70 is in a buffered state, the control device 60 controls the spatial light modulator 30 to perform image modulation to form an information presentation image indicating that buffering is being performed.
In one embodiment, in the local image source display mode, an abnormality occurs in the process of generating an image signal according to locally stored image data to be displayed, for example, a storage device of the projection display device for storing the image data is detached from the projection display device, the storage device is damaged, and a data reading error occurs, which is an abnormal situation in image signal acquisition. In the local image source display mode, the image signal generated by the image decoding section 612 reading and analyzing the image data stored in the storage device 80 is not interrupted and the generation speed of the image signal is fast enough to smoothly display the corresponding video (generate the image signal at the preset frame rate), which is the normal case of image signal acquisition. In one embodiment, when an abnormality occurs in the process of generating an image signal from locally stored image data to be displayed, the control device 60 controls the spatial light modulator 30 to perform an image modulation operation to form an information presentation image indicating that the image signal is abnormally generated, for example, to form an information presentation image indicating that the storage device has been detached, or to form an information presentation image indicating that the storage device is damaged, or the like.
It is to be understood that the projection display device of the present invention is not limited to the schematic structure shown in fig. 1, and the projection display device may have more or less components. The structural composition of the control device 60 is not limited to fig. 1, and the control device 60 may be configured in another configuration.
In one embodiment, the light source light emitted by the light source 10 comprises three primary color light source lights; in the case of an abnormal image signal acquisition, the control device 60 controls the light source 10 to turn off any one or two of the three primary color light source lights during a color image frame modulation period.
The invention does not limit the number of the color image frame modulation periods in one color image frame modulation period, and the terms of "one" and "one" are used for describing the unit of one color image frame modulation period, but do not limit the related control and operation only in one color image frame modulation period.
The three primary light source lights may be, for example, red, green and blue light source lights. It will be appreciated that the three primary color light source lights may also be, for example, magenta, yellow, cyan, etc. The light of the three primary color light sources is combined according to a certain proportion to obtain white light.
A frame of color image signals includes image frame signals corresponding to three primary colors, for example, a frame of color image signals includes: a first primary color frame signal, a second primary color frame signal, and a third primary color frame signal; the light source 10 emits first primary color light source light, second primary color light source light, and third primary color light source light during one frame image modulation period. In a color image frame modulation period, the spatial light modulator 30 operates according to a driving signal corresponding to a first primary color frame signal of a frame of color image signal, and the first primary color source light is condensed to the spatial light modulator 30 and forms a first primary color image light and a first primary color non-image light under the operation of the spatial light modulator 30; the spatial light modulator 30 operates according to a driving signal corresponding to a second primary color frame signal of the frame color image signal, and the second primary color source light is condensed to the spatial light modulator 30 and forms a second primary color image light and a second primary color non-image light under the operation of the spatial light modulator 30; and similarly, third primary color image light and third primary color non-image light are formed.
In a color image frame modulation period, the control device 60 controls the light source 10 to turn off any one or two of the three primary color light source lights, for example, to turn off the first primary color light source light and the second primary color light source light, so that only image light and non-image light corresponding to the turned-on primary color light source light are formed in a color image frame modulation period. Therefore, the non-image light output to the light absorption element can be reduced, the service life of the light absorption element is prolonged, and the maintenance cost of the projection display equipment is reduced.
Fig. 2 shows a control flow diagram of the control device 60 for the light source 10 in one embodiment. As shown in fig. 2: s202, in the external image source display mode or the local image source display mode, the control device 60 detects whether an image signal acquisition abnormality occurs. S204, when an image signal is abnormally obtained, the control device 60 controls the light source 10 to turn off any one or two of the three primary color light source lights within a color image frame modulation period.
In one embodiment, the light source 10 includes: a first light source (not shown) for emitting light of a first primary color, a second light source (not shown) for emitting light of a second primary color, and a third light source (not shown) for emitting light of a third primary color.
In this embodiment, the projection display apparatus has three spatial light modulators 30, and the light beams emitted by the first light source, the second light source, and the third light source are condensed to one of the three spatial light modulators 30, respectively, and one light source corresponds to one spatial light modulator 30. Under the normal condition of image signal acquisition, in a color image frame modulation period, the three light sources all continuously emit light, and the three spatial light modulators 30 respectively modulate the corresponding light source light, so that three primary color images are simultaneously formed and displayed in an overlapping manner, and the visual effect of a color image is formed.
In this embodiment, in the case of an abnormal image signal acquisition, the control device 60 controls to turn off any one or two of the first light source, the second light source, and the third light source in a color image frame modulation period; wherein, the light source which is not turned off in the first light source, the second light source and the third light source is still continuously lighted in a color image frame modulation period.
In one embodiment, the light source 10 includes: a first light source (not shown) for emitting light of a first primary color, a second light source (not shown) for emitting light of a second primary color, and a third light source (not shown) for emitting light of a third primary color.
A color image frame modulation period is divided into three types of time periods which are mutually connected and are not overlapped: a first type of time period for the first light source to emit light, a second type of time period for the second light source to emit light, and a third type of time period for the third light source to emit light. For example, a color image frame modulation cycle may be divided into three time segments, respectively: a first type of time period, a second type of time period and a third type of time period. For another example, a color image frame modulation cycle may be divided into 6 time segments, respectively: the time period comprises a first type time period, a second type time period, a third type time period, a first type time period, a second type time period and a third type time period. And so on, and so on.
In the time period divided by a color image frame modulation period, the two time periods which are connected back and forth do not overlap on the time axis, and the two time periods which are connected back and forth can have no interval (seamless connection); however, in actual operation, the two time periods of the consecutive connection may not be strictly seamless, and a certain interval may be allowed between the two time periods of the consecutive connection. In addition, the interval duration between two time periods which are connected back and forth can be set according to requirements. In this embodiment, the projection display device has at least one spatial light modulator 30. Under the normal condition of image signal acquisition, in a color image frame modulation period, first primary color light source light emitted by a first light source is condensed to the spatial light modulator 30 in a first type of time period, second primary color light source light emitted by a second light source is condensed to the spatial light modulator 30 in a second type of time period, third primary color light source light emitted by a third light source is condensed to the spatial light modulator 30 in a third type of time period, the spatial light modulator 30 modulates corresponding light source light in the first type of time period, the second type of time period and the third type of time period respectively, three primary color image lights are formed in a time sequence, and the corresponding three primary color images are displayed in a time sequence to form a video effect of a color image.
In this embodiment, in the case of an abnormal image signal acquisition, the control device 60 controls to turn off any one or two of the first light source, the second light source and the third light source in the corresponding time period of the three types of time periods in one color image frame modulation period. For example, a first light source is turned off for a first type of time period, or a second type of light source is turned off for a second type of time period, and so on.
In one embodiment, a color image frame modulation period is divided into three types of time periods that are contiguous and non-overlapping: a first type time period, a second type time period and a third type time period; the light source 10 is configured to emit a first primary light source light during a first type of time period, a second primary light source light during a second type of time period, and a third primary light source light during a third type of time period;
during a color image frame modulation period, the control device 60 turns off the light source 10 during any one or two of the three types of time periods so that the corresponding primary color light source light is not emitted. For example, when the light source 10 is turned off in the first type of time period, the first primary color light source light is not emitted; when the light source 10 is turned off during the second type of time period, the light source light of the second primary color is not emitted.
In one embodiment, in the event of an abnormal image signal acquisition, the control device 60 is further configured to control the light source 10 to be turned on and off at a preset frequency, so that the frame rate of an image formed by the image light projected by the projection lens is smaller than the image display frame rate in the event of a normal image signal acquisition. In one implementation, the image display frame rate is a color image display frame rate, i.e., the number of frames of a color image displayed per unit time (e.g., within 1 second). In another embodiment, the image display frame rate is a monochrome image display frame rate, i.e., the number of frames of a monochrome image displayed per unit time (e.g., within 1 second). It is understood that, on the basis that one frame of a color image is composed of three frames of monochrome images, the monochrome image display frame rate is three times the color image display frame rate.
For example, the image display frame rate in the normal case of image signal acquisition is 60 frames/S, and the control device 60 may control the light source 10 to be turned on and off at a preset frequency such that the frame rate of the image formed by the image light projected by the projection lens is less than 60/S.
In this embodiment, the light source 10 is turned off in some time periods, so that the frame rate of an image formed by image light projected by the projection lens is smaller than the image display frame rate in a normal case of image signal acquisition, which reduces the output of the image light on the one hand and correspondingly reduces the output of non-image light on the other hand, thereby reducing the non-image light output to the light absorbing element, prolonging the service life of the light absorbing element, and reducing the maintenance cost of the projection display device.
Fig. 3 shows a control flow diagram of the control device 60 for the light source 10 in one embodiment. As shown in fig. 3: s302, in the external image source display mode or the local image source display mode, the control device 60 detects whether an image signal acquisition abnormality occurs. S304, when an abnormal image signal acquisition occurs, the control device 60 controls the light source 10 to turn on and off according to a preset frequency, so that the frame rate of an image formed by the image light projected by the projection lens is smaller than the image display frame rate in the normal image signal acquisition.
In one embodiment, the light source light emitted by the light source 10 comprises three primary color light source lights; the light source 10 may be turned off in the manner of the above embodiment, for example, the control device 60 may control the light source 10 to turn off any one of the three primary color light source lights or any two of the three primary color light source lights within one color image frame modulation period, so that the frame rate of the image formed by the image light projected by the projection lens 40 is smaller than the image display frame rate in the normal case of image signal acquisition. In one embodiment, the control device 60 may control the light source 10 to turn off any one or two of the three primary color light source lights in each color image frame modulation period. In one embodiment, the control device 60 may control the light source 10 to turn off any one or two of the three primary color light source lights within one color image frame modulation period according to a preset frequency, and a preset color image frame modulation period may be spaced between two closest color image frame modulation periods in which the one or two primary color light source lights are turned off.
In another embodiment, the control device 60 may control the light source 10 to be turned off for the whole period of some color image frame modulation periods according to a preset frequency, and no image light is formed and thus no image is formed during one color image frame modulation period in which the light source 10 is turned off. The two closest color image frame modulation periods in which the light source 10 is turned off may be separated by a preset number of color image frames, or the control device 60 may control the light source 10 to be turned off during the whole period of several consecutive color image frame modulation periods, so that the frame rate of the image formed by the image light projected by the projection lens is lower than the image display frame rate in the case of normal image signal acquisition.
In other embodiments, the light source light emitted by the light source 10 comprises three primary color light source lights; the control device 60 may turn off any one or two of the three primary color light source lights in some color image frame modulation periods, and control the light source 10 to turn off the three primary color light source lights in some color image frame modulation periods, so that the frame rate of the image formed by the image light projected by the projection lens is less than the image display frame rate in the normal case of image signal acquisition.
In one embodiment, the frame rate of an image formed by image light projected by the projection lens is not infinitesimal but 1 frame/S or more. The image displayed at the frame rate of 1 frame/S or more can still provide an information presentation function to the user, and the information presentation to the user is not hindered even when the non-image light output to the light absorbing element is reduced.
In the above embodiment, the control device 60 controls the turning on and off of the light source 10. In one embodiment, the control device 60 may also control the output intensity of the light source light to decrease during the period when the light source 10 is controlled to be turned on and output the light source light. In one embodiment, the light source 10 outputs light source light formed by combining light beams emitted from a plurality of light source units; in the case of an image signal acquisition abnormality, the control device may further control a part of the plurality of light source units to be turned off, thereby reducing the intensity of the output light source light.
In one embodiment, in one or both of the image signal acquisition abnormal condition and in the standby mode, the control device 60 issues a drive signal to the spatial light modulator 30 so that the spatial light modulator 30 modulates the image light and the non-image light formed by the light source light to satisfy the following relationship: the ratio of image light to light source light is larger than the ratio of non-image light to light source light, and the light output to the light absorbing element is reduced by forming an information presentation image with a bright background.
When forming the information presentation image with a bright background, the spatial light modulator 30 modulates more image light formed by the light source light and forms less non-image light, in other words, the ratio of the image light to the light source light is larger than the ratio of the non-image light to the light source light.
In one embodiment, the information cue image of the light background is composed of the light background and a dark pattern symbol, and the dark pattern symbol comprises one or more of dark text, dark lines and dark frames. In one embodiment, the dark pattern symbols are darker than the light background to a greater extent than minimally perceptible to the human eye. For example, in the image modulation scheme with 255 as the highest image gray scale value, the image gray scale value corresponding to the pixel of the bright background is greater than or equal to 200, and the image gray scale value corresponding to the pixel of the dark pattern symbol is less than or equal to 100. Wherein, the degree of darkness of the dark pattern symbol compared with the bright background is at least 100 gray levels.
In one embodiment, the information cue image for a bright background includes the following images: the background is white or grey white, and one or more of black characters, black lines, black block diagrams and the like are embedded in the background.
Fig. 4 shows a control flow diagram of the control device 60 for the spatial light modulator 30 in an embodiment. As shown in fig. 4: s402, in the external image source display mode or the local image source display mode, the control device 60 detects whether an image signal acquisition abnormality occurs. S404, when an image signal acquisition abnormality occurs, the control device 60 sends a drive signal to the spatial light modulator 30 so that the spatial light modulator 30 modulates the image light and the non-image light formed by the light source light to satisfy the following relationship: the ratio of image light to light source light is larger than the ratio of non-image light to light source light, and the light output to the light absorbing element is reduced by forming an information presentation image with a bright background.
In one embodiment, the state of not being in the external image source display mode and not being in the local image source display mode and waiting for the instruction input belongs to the standby mode. In one embodiment, the bright background informational cue image comprises a bright background standby image; in the standby mode, the control device 60 is configured to issue a driving signal to the spatial light modulator when a duration of a period in which the input instruction is not detected exceeds a threshold value, so that the spatial light modulator modulates the light source light to form a standby image of a bright background.
Fig. 5 shows a control flow diagram of the control device 60 for the spatial light modulator 30 in an embodiment. As shown in fig. 5: s502, in the standby mode, the control device 60 determines whether or not the duration of the period in which the input instruction is not detected exceeds the threshold. S504, when the duration of the period in which the input instruction is not detected exceeds the threshold, the control device 60 issues a drive signal to the spatial light modulator 30 so that the spatial light modulator modulates the light source light to form a standby image of a bright background.
In one embodiment, the information indicative of a bright background image comprises: a menu interface image with a bright background; in the standby mode, the control device is used for sending a driving signal to the spatial light modulator when an input instruction is detected, so that the spatial light modulator modulates the light source light to form a menu interface image with a bright background corresponding to the detected input instruction.
The menu interface image comprises a plurality of control icons, and when the control image obtains a focus, the preset instruction can trigger an event which is bound by the control image and corresponds to the preset instruction, so that the corresponding user interaction function is realized.
Fig. 6 shows a control flow diagram of the control device 60 for the spatial light modulator 30 in an embodiment. As shown in fig. 6: s620, in the standby mode, the control device 60 determines whether an input instruction is detected; s640, when the input instruction is detected, the control device 60 sends a driving signal to the spatial light modulator 30, so that the spatial light modulator modulates the light source light to form a menu interface image of a bright background corresponding to the detected input instruction.
The embodiments in the present specification are described with different emphasis points, and technical features of the embodiments can be combined without contradiction; combinations of the various embodiments described herein will be apparent to those skilled in the art without the exercise of inventive faculty, and are within the scope of the claims.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. A projection display apparatus comprising a light source, control means, a spatial light modulator, a projection lens and a light absorbing element, wherein:
the light source is used for emitting light source light;
the control device is used for sending a driving signal to the spatial light modulator;
the spatial light modulator is used for modulating the light source light according to the driving signal to form image light and non-image light, the image light is output to the projection lens, and the non-image light is output to the light absorbing element;
the projection lens is used for projecting the image light to form an image;
the light absorbing element is used for absorbing the non-image light;
the control device is further used for controlling the light source to be turned on and off according to a preset frequency under the condition that the image signal is abnormal, so that the frame rate of an image formed by image light projected by the projection lens is smaller than the image display frame rate under the condition that the image signal is normal.
2. The projection display apparatus according to claim 1, wherein in the event of an image signal acquisition abnormality, the control means is configured to issue a drive signal to the spatial light modulator so that the spatial light modulator modulates the image light and the non-image light formed by the light source light so as to satisfy the following relationship: the ratio of the image light to the light source light is larger than the ratio of the non-image light to the light source light, so that an information prompt image with a bright background is formed to reduce the light output to the light absorbing element.
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| CN201910609205.2A CN110351539B (en) | 2016-11-17 | 2016-11-17 | Projection display apparatus |
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| CN201611010430.7A CN108076330B (en) | 2016-11-17 | 2016-11-17 | Projection display apparatus |
| CN201910609205.2A CN110351539B (en) | 2016-11-17 | 2016-11-17 | Projection display apparatus |
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| CN116800939A (en) * | 2019-07-29 | 2023-09-22 | 深圳光峰科技股份有限公司 | Projection display device |
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| JP2001166255A (en) * | 1999-12-06 | 2001-06-22 | Sharp Corp | Image projecting device |
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| CN103297734A (en) * | 2012-03-02 | 2013-09-11 | 三菱电机株式会社 | Multi-screen display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1157623C (en) * | 2001-01-22 | 2004-07-14 | 台达电子工业股份有限公司 | Optical path design of optical system |
| JP2005092182A (en) * | 2003-08-13 | 2005-04-07 | Sony Corp | Projection type display device |
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| JP2001166255A (en) * | 1999-12-06 | 2001-06-22 | Sharp Corp | Image projecting device |
| CN1580867A (en) * | 2003-08-14 | 2005-02-16 | 台达电子工业股份有限公司 | Digital light treating projecting system and its projecting method |
| CN103297734A (en) * | 2012-03-02 | 2013-09-11 | 三菱电机株式会社 | Multi-screen display device |
| WO2013150604A1 (en) * | 2012-04-03 | 2013-10-10 | Ｎｅｃディスプレイソリューションズ株式会社 | Image display apparatus and abnormality notifying method |
| JP2014016561A (en) * | 2012-07-11 | 2014-01-30 | Seiko Epson Corp | Projector, and control method of projector |
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| CN108076330A (en) | 2018-05-25 |
| CN110225325B (en) | 2021-06-11 |
| WO2018090843A1 (en) | 2018-05-24 |
| CN108076330B (en) | 2019-09-20 |
| CN110225325A (en) | 2019-09-10 |
| CN110351539A (en) | 2019-10-18 |
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