Projection control method and device, projector and storage medium

Abstract

The invention discloses a projection control method and device, a projector and a storage medium. The method comprises the following steps: calculating a light source intensity control parameter and a jitter ratio of a digital micromirror device according to a to-be-projected frame picture; when an acquisition time point corresponding to the frame picture to be projected arrives, acquiring a light source intensity control signal to obtain a light source intensity control parameter corresponding to the frame picture; when the issuing time point corresponding to the frame picture to be projected arrives, issuing a current control signal of the light source; and when the projection time point of the frame picture arrives, controlling the light source to emit light according to the current control signal, and controlling the digital microlens device to operate according to the jitter proportion so as to project the frame picture. In the application, the current control signal of the light source can change along with the change of the frame picture, so that the intensity of the current of the light source is smaller when the frame picture with lower brightness or black is projected, thereby reducing the energy consumption and the picture display effect of the projector, and improving the resource utilization rate of the projector.

Description

Technical Field

[0001] The present application relates to the field of image projection technology, and more specifically, to a projection control method, device, projector and storage medium. Background Art

[0002] At present, in teaching or meetings, videos or pictures can be projected with the help of a projector. During the projection process of the projector, some black images may appear. However, when projecting black images, the light output is mainly reduced by adjusting the flip of the light modulator, and the light output of the projector is not reduced in a targeted manner. With this projection control method, the energy consumption of the projector is high and the user experience is poor. Summary of the invention

[0003] In view of the above problems, the present application proposes a projection control method, device, projector and storage medium, which can reduce the energy consumption of the projector.

[0004] In a first aspect, an embodiment of the present application provides a projection control method for a projector including a light source and a digital microlens device; the method includes:

[0005] The light source intensity control parameter and the jitter ratio of the digital micromirror device are calculated according to the frame image to be projected, and the light source intensity control parameter is sent down through the light source intensity control signal;

[0006] When the acquisition time point corresponding to the frame picture to be projected arrives, the light source intensity control signal is acquired to obtain the light source intensity control parameter corresponding to the frame picture;

[0007] When the time point corresponding to the frame to be projected is reached, a current control signal of the light source is sent down, at least part of the current control signal is determined according to the light source intensity control parameter;

[0008] When the projection time point of the frame picture arrives, the light source is controlled to emit light according to the current control signal, and the digital microlens device is controlled to operate according to the jitter ratio to project the frame picture.

[0009] In a second aspect, an embodiment of the present application provides a projection control device, characterized in that it is used for a projector including a light source and a digital microlens device; the device includes:

[0010] A calculation module, used to calculate the light source intensity control parameter and the jitter ratio of the digital micromirror device according to the frame image to be projected, and the light source intensity control parameter is sent through the light source intensity control signal;

[0011] An acquisition module, used for acquiring a light source intensity control signal to acquire a light source intensity control parameter corresponding to a frame image when an acquisition time point corresponding to a frame image to be projected arrives;

[0012] A sending module, used for sending a current control signal of the light source when the sending time point corresponding to the frame to be projected arrives, at least part of the current control signal is determined according to the light source intensity control parameter;

[0013] The control module is used to control the light source to emit light according to the current control signal when the projection time point of the frame picture arrives, and control the operation of the digital microlens device according to the jitter ratio to project the frame picture.

[0014] In a third aspect, an embodiment of the present application provides a projector, including:

[0015] one or more processors;

[0016] Memory;

[0017] One or more applications, wherein the one or more applications are stored in a memory and configured to be executed by one or more processors, and the one or more programs are configured to execute the method of the first aspect above.

[0018] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, in which a program code is stored, wherein when the program code is executed by a processor, the method of the first aspect described above is executed.

[0019] The embodiments of the present application provide a projection control method, device, projector and storage medium. In the present application, the projector obtains light source intensity control parameters according to the light source intensity control signal of the frame image, and determines the current control signal of the light source through the light source intensity control parameters. The current control signal of the light source changes with the change of the frame image. The current control signal of the light source is no longer determined according to the set fixed brightness information. The current control signal of the light source can change with the change of the frame image, so that the intensity of the current of the light source is smaller when the projection brightness is low or the frame image is black, thereby reducing the energy consumption of the projector and the picture display effect, and improving the resource utilization of the projector. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A flow chart of a projection control method proposed in one embodiment of the present application is shown.

[0022] Figure 2 A structural block diagram of a projector in an embodiment of the present application is shown.

[0023] Figure 3 A schematic diagram of a pulse width modulation signal in an embodiment of the present application is shown.

[0024] Figure 4 A flowchart of a projection control method proposed in yet another embodiment of the present application is shown.

[0025] Figure 5 A schematic diagram showing the color segments of each sub-light source in an embodiment of the present application is shown.

[0026] Figure 6 A flowchart of a projection control method proposed in yet another embodiment of the present application is shown.

[0027] Figure 7 A flowchart of a projection control method proposed in yet another embodiment of the present application is shown.

[0028] Figure 8 A block diagram of a projection control device proposed in one embodiment of the present application is shown.

[0029] Fig. 9 A block diagram of a projector proposed in yet another embodiment of the present application is shown.

[0030] Fig.10 A structural block diagram of a computer-readable storage medium according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. According to the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0033] Reference Figure 1 , Figure 1 A flowchart of a projection control method proposed in one embodiment of the present application is shown. The method is used for a projector including a light source and a digital microlens device. The method includes:

[0034] S110 , calculating a light source intensity control parameter and a jitter ratio of a digital micromirror device according to a frame image to be projected, and sending the light source intensity control parameter via a light source intensity control signal.

[0035] In this embodiment, the structure of the projector can refer to Figure 2 As shown, the projector may include a signal input module 201 , a DLP control processing module 202 (which may include a DLP chip), an IDU control processing module 203 , a light source current driving module 204 , and a digital microlens device (DMD) 205 .

[0036] Among them, the signal input module 201: provides the frame image to be projected, the DLP control processing module 202: analyzes and processes the signal of the input frame image, and outputs related image signals (light source intensity control signal and jitter ratio of the digital microlens device, etc.), the IDU control processing module 203: analyzes and processes the related image signals output by the DLP control processing module, controls the light source and configures the current of the light source, etc., the light source current driving module 204: receives the set current signal, converts the output current and excites the light source, DMD205: an array composed of multiple high-speed digital light reflection switches, which operates according to the jitter ratio to achieve reflective imaging.

[0037] The signal input module is used to obtain the frame to be projected. The frame to be projected may refer to the frame that the projector needs to display at each refresh moment when the projector works at a set refresh rate. The frame to be projected may be any video frame of the video stream acquired by the projector, and the frame to be projected may also be any static picture or image acquired by the projector. For example, the projector projects movie A, and each video frame of movie A is a frame to be projected. For another example, the projector projects a PPT document, and each page of the PPT document is a frame to be projected. For another example, the projector projects the screen of a computer, and any picture displayed on the computer screen may be a frame to be projected.

[0038] After the signal input module obtains the frame to be projected, it sends the signal of the frame to be projected (also called image signal) to the DLP control processing module. The DLP control processing module processes the image signal of the frame to be projected according to the built-in dynamic black algorithm, and obtains the dynamic black pulse width modulation (DynamicBlack PWM) corresponding to the frame and the jitter ratio corresponding to the digital microlens device. The calculated dynamic black pulse width modulation signal is the light source intensity control signal.

[0039] The signal input module determines the light source intensity control parameters at different times according to the frame information, and modulates the light source intensity control signal according to the light source intensity control parameters at different times. At a certain moment, the obtained light source intensity control signal can be read to obtain the signal value of the light source intensity control signal at that moment as the light source intensity control parameter, that is, the light source intensity control parameter is read through the light source intensity control signal.

[0040] Among them, PWM signal (pulse width modulation signal) refers to a rectangular signal with a duty cycle obtained by digitally encoding the analog signal level. The duty cycle can refer to the proportion of the power-on time to the total time in a pulse cycle, such as Figure 3 As shown, the duty cycle of the pulse width modulation signal corresponding to the current is 1 / 2, that is, in one pulse cycle, the power-on time is 1 / 2 of the total time.

[0041] The jitter ratio of the digital microlens device refers to the ratio of the jitter duration of the digital microlens device to the duration of the control period in one control period. For example, if the jitter ratio of the digital microlens device is 0.5, it means that the jitter duration of the digital microlens device in one control period is half of the control period.

[0042] The signal input module sends the signal of each frame to the DLP control processing module in turn. The DLP control processing module modulates the light source intensity control signal of each frame according to the signal of each frame, and determines the jitter ratio corresponding to the digital microlens device.

[0043] S120 , when the acquisition time point corresponding to the frame image to be projected arrives, the light source intensity control signal is acquired to obtain the light source intensity control parameter corresponding to the frame image.

[0044] For each frame, corresponding to the respective acquisition time point, when the acquisition time point of the frame is reached, it indicates that the DLP control processing module has obtained the light source intensity control parameters corresponding to the frame and the jitter ratio corresponding to the digital microlens device, and directly obtains the light source intensity control parameters corresponding to the frame from the light source intensity control signal output by the DLP control processing module, and obtains the jitter ratio corresponding to the digital microlens device.

[0045] The acquisition time point can be determined according to the moment when the DLP control processing module receives the signal of each frame and the processing time of the signal of each frame by the DLP control processing module. For example, the moment t1 when the DLP control processing module receives the signal of frame A1 and the processing time t2 of the signal of frame A1 by the DLP control processing module are added to obtain t3, and t3 is used as the acquisition time point of frame A.

[0046] It can be understood that when the projector works at the set refresh rate, the signal input module sends the signal of each frame at a fixed sending interval, and the processing time of the DLP control processing module for each frame signal can also be a fixed time. Therefore, the acquisition time point of each frame can be determined in advance based on the moment when the DLP control processing module receives the signal of each frame and the processing time of the DLP control processing module for each frame signal.

[0047] It should be noted that the DLP control processing module can pre-process the signals of each frame in advance to obtain the light source intensity control parameters of each frame, and obtain the light source intensity control signal according to the light source intensity control modulation of each frame.

[0048] S130. When the sending time point corresponding to the frame to be projected arrives, send a current control signal of the light source, at least part of which is determined according to the light source intensity control parameter.

[0049] Among them, the current control signal includes a switch signal and a current magnitude signal. After obtaining the light source intensity control parameter, the light source intensity control parameter can be sent to the IDU control processing module of the projector, and the IDU control processing module determines the current magnitude signal of the light source according to the duty cycle of the light source intensity control parameter and the maximum current of the light source, and obtains the switch signal of the light source according to the frame sequence of the frame picture, and summarizes the switch signal and the current magnitude signal as the current control signal.

[0050] As an implementation method, the DLP control processing module can parse the signal of the frame picture to obtain a frame picture sequence of the frame pictures, wherein the frame picture sequence refers to a sequence composed of pure color frame pictures corresponding to each light source. For example, the light source includes a red light source, a blue light source and a green light source, and the frame picture sequence includes a sequence composed of red pure color frame pictures, blue pure color frame pictures and green pure color frame pictures.

[0051] The product of the duty cycle and the maximum current of the light source may be calculated as the signal value of the current magnitude signal of the light source. For example, the duty cycle of the light source intensity control signal is 1 / 2, and the rated current of the light source is 0.5A. According to the duty cycle of the light source intensity control signal and the rated current of the light source, the signal value of the current magnitude signal of the light source is determined to be 0.5×1 / 2=0.25A, and a current magnitude signal of 0.25A is generated according to the signal value of the current magnitude signal.

[0052] S140, when the projection time point of the frame picture arrives, control the light source to emit light according to the current control signal, and control the digital microlens device to operate according to the jitter ratio to project the frame picture.

[0053] Each frame image corresponds to its own projection time point, and when the projection time point arrives, the projector projects the frame image. When the projection time point of the frame image arrives, the projector controls the light source to emit light according to the current control signal of the light source, and at the same time, controls the operation of the digital microlens device according to the jitter ratio of the digital microlens device, and projects the frame image on the projection area of ​​the projector through the reflection imaging of the digital microlens device to obtain the projection image.

[0054] The projection time point may be the arrival time of the frame sequence index signal (Sequence_index) corresponding to the acquired frame. The frame sequence index signal refers to an indication signal before the frame starts to be output. When the frame sequence index signal arrives, it means that the frame indicated by the frame sequence index signal will be output immediately.

[0055] When the projection time point of the frame image arrives, the light source is turned on by the switch signal in the current control signal, and the power source is controlled to emit light according to the current magnitude signal in the current control signal. At the same time, the operation of the digital microlens device is controlled according to the jitter ratio.

[0056] In this embodiment, the projector obtains the light source intensity control parameters according to the light source intensity control signal of the frame image, and determines the partial current control signal of the light source through the light source intensity control parameters. The current control signal of the light source changes with the change of the frame image. The current control signal of the light source is no longer determined according to the set fixed brightness information. The current control signal of the light source can change with the change of the frame image, so that the current intensity of the light source is smaller when the projection brightness is low or the frame image is black, thereby reducing the energy consumption of the projector and the picture display effect, and improving the resource utilization of the projector.

[0057] Reference Figure 4 , Figure 4 A flowchart of a projection control method proposed in another embodiment of the present application is shown. The method is used for a projector including a light source and a digital microlens device. The method includes:

[0058] S210 , calculating a light source intensity control parameter and a jitter ratio of a digital micromirror device according to a frame image to be projected.

[0059] The description of S210 refers to the description of S110 above, and will not be repeated here.

[0060] S220, monitor the frame picture sequence index signal, take the moment when the frame picture sequence index signal changes as the first moment, and collect the light source intensity control signal after a first delay on the basis of the first moment to obtain the light source intensity control parameter corresponding to the frame picture; take the moment when the light source intensity control signal changes for the first time after the first moment as the second moment, wherein the moment corresponding to the first delay is between the first moment and the second moment.

[0061] In this embodiment, a frame picture sequence index signal (Sequence index signal) is used as a guide signal, and the indication signal is used to indicate the acquisition of the light source intensity control signal to obtain the light source intensity control parameter corresponding to the frame picture and to indicate the sending of the current control signal. The change in the frame picture sequence index signal may refer to the change in the level of the frame picture sequence index signal and the change in the frame picture sequence index signal suddenly becoming high.

[0062] The change of the light source intensity control signal may refer to the change of the signal value of the light source intensity control signal. The signal value of the light source intensity control signal may be higher or lower, which may be regarded as the change of the light source intensity control signal. For a frame, the boundary indication signal appears first, and then the light source intensity control signal of the frame is obtained, and then the frame sequence index signal of the frame is obtained.

[0063] When the Sequence index signal is used as the indicator signal, when the change of the Sequence index signal is monitored, the light source intensity control signal output by the DLP control processing module starts to be sampled. Since the Sequence index signal appears after the DLP control processing module parses the frame image signal to obtain the updated DynamicBlack PWM signal, the frame image light source brightness information will be output after the DynamicBlack PWM signal changes, so the sampling time only needs to be sampled before the DynamicBlack PWM signal of the frame image changes at the latest. In other words, the acquisition time point obtained after the first delay based on the first moment is between the changing moments of the DynamicBlack PWM signal, that is, the delay time is less than the time difference between the second moment and the first moment.

[0064] For example, the frame picture includes frame picture a1, frame picture a2 and frame picture a3 arranged in sequence. For frame picture a3, the arrival time b2 of the Sequence index signal of frame picture a2 can be determined as the first moment, and the arrival time of the DynamicBlack PWM signal of frame picture a3 can be determined as the second moment b3. After the first moment is delayed for the first time, the acquisition time point obtained is between b2 and b3. At this time, b2 can be used as an acquisition time point, that is, at this time, the DynamicBlack PWM of frame picture a3 is sampled when the Sequence index signal of frame picture a2 arrives, and the DynamicBlack PWM of frame picture a3 is applied when the Sequenceindex signal of frame picture a3 arrives.

[0065] S230: After monitoring that the frame picture sequence index signal changes again, current control signals determined according to the light source control parameters are sent to all sub-light sources within the first spoke period.

[0066] The light source includes a plurality of sub-light sources with different luminous colors, and the plurality of sub-light sources emit light in corresponding color segments. The color segment of each sub-light source can be determined according to the frame sequence, and the color segments of different sub-light sources may be different. The color segment refers to the luminous period of the sub-light source.

[0067] After monitoring that the frame picture sequence index signal changes again, indicating that a current control signal needs to be sent down, the current control signal determined according to the light source control parameters for all sub-light sources - the current size signal - can be directly sent down. That is, the current control signal determined according to the light source control parameters for the sub-light source refers to the current size signal corresponding to the sub-light source, and does not include the switch signal corresponding to the sub-light source.

[0068] The spoke period refers to the spoke segment between the color segments corresponding to the multiple sub-light sources, and the sub-light source does not emit light during the spoke period. The multiple sub-light sources can emit light in a certain order. After the frame sequence index signal changes again, the spoke period before the color segment of the first sub-light source is the first spoke period.

[0069] For example, the sub-light source includes a red sub-light source, a green sub-light source and a blue sub-light source, which emit light in sequence. The first spoke period is the spoke period before the color segment of the red sub-light source, and the current size signals of the red sub-light source, the green sub-light source and the blue sub-light source are respectively emitted during the first spoke period before the color segment of the red sub-light source.

[0070] like Figure 5As shown, the frame sequence index signal 1 is the projection time point of frame 1, the frame sequence index signal 2 is the projection time point of frame 2, the frame sequence index signal 3 is the projection time point of frame 3, the duration between the frame sequence index signal 1 and the frame sequence index signal 2 is the frame duration, and RGB represents the color segment of the red light source, the color segment of the green light source, and the color segment of the blue light source, respectively. The spoke period between the color segment of the first light source of frame 1 (the color segment of the light source of the red sub-light source) and the color segment of the last light source of the previous frame (the color segment of the light source of the blue sub-light source) is taken as the spoke period 1, and so on, to obtain the spoke periods 2-7. Each sub-light source can be configured respectively by the current magnitude signal of each sub-light source at the arrival time of the frame sequence index signal 1 (which can also be the spoke period 1). At the arrival moment of the frame picture sequence index signal 1, that is, within the spoke period 1, each sub-light source can be configured respectively through the respective current size signals of each sub-light source under the frame picture 1, so that each sub-light source emits light according to its respective configured current within the frame duration of the frame picture 1. Similarly, at the arrival moment of the frame picture sequence index signal 2, that is, within the spoke period 4, each sub-light source can be configured respectively through the respective current size signals of each sub-light source under the frame picture 2, so that each sub-light source emits light according to its respective configured current within the frame duration of the frame picture 2.

[0071] S240: After the frame picture sequence index signal is monitored to change again, a current control signal determined according to the light source control parameter is sent to the sub-light source emitting light in the subsequent color segment in each spoke period.

[0072] That is to say, the current magnitude signal of each sub-light source is issued in a spoke period adjacent to and before each sub-light source. For example, the sub-light sources include a red sub-light source, a green sub-light source and a blue sub-light source, which emit light in sequence, and the current magnitude signal of the red sub-light source is issued in a spoke period adjacent to and before the color segment of the red sub-light source, the current magnitude signal of the green sub-light source is issued in a spoke period adjacent to and before the color segment of the green sub-light source, and the current magnitude signal of the blue sub-light source is issued in a spoke period adjacent to and before the color segment of the blue sub-light source.

[0073] For example, Figure 5As shown, the red sub-light source can be configured according to the current signal pair of the red sub-light source under frame picture 1 in spoke period 1, the green sub-light source can be configured according to the current signal pair of the green sub-light source under frame picture 1 in spoke period 12, and the blue sub-light source can be configured according to the current signal pair of the blue sub-light source under frame picture 1 in spoke period 13. Similarly, the red sub-light source can be configured according to the current signal pair of the red sub-light source under frame picture 2 in spoke period 14, the green sub-light source can be configured according to the current signal pair of the green sub-light source under frame picture 2 in spoke period 15, and the blue sub-light source can be configured according to the current signal pair of the blue sub-light source under frame picture 2 in spoke period 16.

[0074] S250, when the projection time point of the frame picture arrives, control the light source to emit light according to the current control signal, and control the digital microlens device to operate according to the jitter ratio to project the frame picture.

[0075] The description of S250 refers to the description of S140 above and will not be repeated here.

[0076] In this embodiment, the acquisition time point after the first delay is determined according to the frame sequence index signal corresponding to the frame image, so that the light source intensity control parameter and the jitter ratio corresponding to the digital microlens device can be accurately acquired at the acquisition time point, so that the control effect of the projection control process is better.

[0077] Reference Figure 6 , Figure 6 A flowchart of a projection control method proposed in another embodiment of the present application is shown. The method is used for a projector including a light source and a digital microlens device. The method includes:

[0078] S310 , calculating a light source intensity control parameter and a jitter ratio of a digital micromirror device according to a frame image to be projected.

[0079] The description of S310 refers to the description of S110 above and will not be repeated here.

[0080] S320, monitor the boundary indication signal, take the moment when the boundary indication signal changes as the third moment, collect the light source intensity control signal after the second delay on the basis of the third moment to obtain the light source intensity control parameter corresponding to the frame image; take the moment when the light source intensity control signal changes for the first time after the third moment as the fourth moment, wherein the moment corresponding to the second delay is after the fourth moment.

[0081] In this embodiment, a boundary indication signal (Frame Vsync) is used as a guide signal. Frame Vsync refers to an indication signal when the DLP control processing module receives a new frame. The change in the boundary indication signal may refer to a change in the level of the boundary indication signal and a sudden change in the level of the boundary indication signal.

[0082] The change of the light source intensity control signal may refer to the change of the signal value of the light source intensity control signal. The signal value of the light source intensity control signal may be higher or lower, which may be regarded as the change of the light source intensity control signal. For a frame, the boundary indication signal appears first, then the light source intensity control signal of the frame is obtained, and then the boundary indication signal of the frame is obtained.

[0083] When the Frame Vsync signal is used as the indicator signal, when the Frame Vsync signal changes, the light source intensity control signal output by the DLP control processing module starts to be sampled. Since the Frame Vsync signal is before the DLP control processing module parses the frame image signal update DynamicBlack PWM signal changes, the frame image light source brightness information will be output after the DynamicBlack PWM signal changes, so the sampling time needs to be carried out at the earliest after the DynamicBlackPWM signal of the previous frame image changes. In other words, the sampling time after the third moment is delayed by the second delay needs to be after the first change of the light source intensity control signal, that is, the moment corresponding to the second delay is after the fourth moment.

[0084] For example, the frame picture includes frame pictures a4, frame pictures a5 and frame pictures a6 arranged in sequence. For frame picture a6, the moment when the boundary indication signal of frame picture a5 changes can be determined as the third moment, the arrival of the DynamicBlack PWM signal b5 of frame picture a5 can be determined as the fourth moment, and the moment after the second delay from the third moment is determined as the acquisition time point, which is after b5.

[0085] S330: on the basis of the third moment, after a third delay, a current control signal determined according to the light source control parameter is issued to all sub-light sources in the first spoke period.

[0086] Since the time node for writing the current control signal must be within the spoke period after the receiving time node for the frame picture sequence index signal, however, in this embodiment only the boundary indication signal is monitored, the receiving time node for the frame picture sequence index signal after the boundary indication signal can be inferred by a fixed delay, that is, the time difference between the direct receiving time points of the frame picture sequence index signal and the boundary indication signal can be used as the third delay.

[0087] After the third delay is reached, the current control signal determined by the light source control parameter is sent to all sub-light sources in the first spoke period. The sending process of the current control signal determined by the light source control parameter in S330 is described in S230 above and will not be repeated here.

[0088] As an implementation method, the projector can also detect a color segment selection signal (RGB Sel signal), the color segment selection signal includes an RSel signal, a G Sel signal and a G Sel signal, the signal value of the RSel signal is not 0 in the color segment of the red light source, the signal value of the G Sel signal is not 0 in the color segment of the green light source, the signal value of the B Sel signal is not 0 in the color segment of the blue light source, and the signal values ​​of the RSel signal, the G Sel signal and the G Sel signal are all 0 during the spoke period.

[0089] In a specific embodiment, the length of the second delay is such that the light source intensity control signal is collected just within the last color segment after the second delay based on the third moment, and then the change of the color segment selection signal is detected, and when the signal values ​​of the R Sel signal, the G Sel signal, and the G Sel signal all become 0, the current control signal determined by the light source control parameter is sent to all sub-light sources.

[0090] S340. Based on the third moment, after a third delay, a current control signal determined according to the light source control parameter is issued to a portion of the sub-light sources emitting light in the subsequent color segment in each spoke period.

[0091] After the third delay is reached, the current control signal determined by the light source control parameter is sent to the part of the sub-light source emitting light in the subsequent color segment in each spoke period. The process of sending the current control signal determined by the light source control parameter to the part of the sub-light source in S340 is similar to the description of S240 above, which will not be repeated here.

[0092] In a specific embodiment, the length of the second delay is such that the light source intensity control signal is collected just in the last color segment after the second delay based on the third moment, and then the change of the color segment selection signal is detected, and each time the signal values ​​of the R Sel signal, the G Sel signal, and the G Sel signal all become 0, the current control signal determined by the light source control parameter is sent to the part of the sub-light source that emits light in the subsequent color segment.

[0093] For example, when the signal values ​​of the R Sel signal, the G Sel signal, and the G Sel signal all become 0 for the first time, the part of the red sub-light source that emits light in the subsequent color segment is issued according to the current control signal determined by the light source control parameters, so that the red sub-light source emits light; when the signal values ​​of the R Sel signal, the G Sel signal, and the GSel signal all become 0 for the second time, the part of the green sub-light source that emits light in the subsequent color segment is issued according to the current control signal determined by the light source control parameters, so that the green sub-light source emits light; when the signal values ​​of the RSel signal, the G Sel signal, and the G Sel signal all become 0 for the third time, the part of the blue sub-light source that emits light in the subsequent color segment is issued according to the current control signal determined by the light source control parameters, so that the blue sub-light source emits light.

[0094] S350, when the projection time point of the frame picture arrives, control the light source to emit light according to the current control signal, and control the digital microlens device to operate according to the jitter ratio to project the frame picture.

[0095] The description of S350 refers to the description of S140 above and will not be repeated here.

[0096] In this embodiment, the acquisition time point after the second delay is determined according to the boundary indication signal corresponding to the frame image, so that the light source intensity control parameter and the jitter ratio corresponding to the digital microlens device can be accurately acquired at the acquisition time point, so that the control effect of the projection control process is better.

[0097] At the same time, at the time point after the third delay, the signal can accurately determine the writing time of the current size signal by monitoring the boundary indication signal alone. There is no need to monitor the boundary indication signal and the frame sequence index signal at the same time, which reduces the number of pins required for monitoring the signal, thereby reducing the possibility of data errors and improving the accuracy of the monitored signal.

[0098] Reference Figure 7 , Figure 7 A flowchart of a projection control method proposed in another embodiment of the present application is shown. The method is used for a projector including a light source and a digital microlens device. The method includes:

[0099] S410 , calculating a light source intensity control parameter and a jitter ratio of a digital micromirror device according to a frame image to be projected.

[0100] The description of S410 refers to the description of S110 above and will not be repeated here.

[0101] S420, monitoring the level change of the boundary indicator signal, taking the moment when the boundary indicator signal changes as the third moment, and collecting the light source intensity control signal after a second delay based on the third moment to obtain the light source intensity control parameter corresponding to the frame image.

[0102] In this embodiment, when the frame picture sequence index signal and the boundary indication signal are used as the guide signal, that is, the frame picture sequence index signal and the boundary indication signal exist at the same time.

[0103] The level change of the boundary indicator signal can be monitored, and the moment when the boundary indicator signal changes is taken as the third moment. The light source intensity control signal is collected after the second delay based on the third moment to obtain the light source intensity control parameter corresponding to the frame. The moment when the light source intensity control signal changes for the first time after the third moment is taken as the fourth moment, and the moment corresponding to the second delay is located after the fourth moment.

[0104] S430: After monitoring the change of the frame picture sequence index signal after the third moment, a current control signal determined according to the light source control parameter is sent to all sub-light sources within the first spoke period.

[0105] In this embodiment, after monitoring the change of the frame picture sequence index signal after the third moment, the current magnitude signal determined according to the light source control parameter may be directly sent to all sub-light sources in the first spoke period.

[0106] S440: After monitoring the occurrence of a change in the frame picture sequence index signal after the third moment, a current control signal determined according to the light source control parameter is issued to the portion of the sub-light sources emitting light in the subsequent color segment in each spoke period.

[0107] In this embodiment, after monitoring the change of the frame picture sequence index signal after the third moment, the current control signal determined by the light source control parameter may be sent to the part of the sub-light source emitting light in the subsequent color segment in each spoke period.

[0108] Take the frames c1, c2, c3 and c4 as examples of frames displayed in sequence. When the Sequence index signal corresponding to the frame c1 is monitored to change, it indicates that the frame c1 is about to be projected and displayed. The DLP control processing module obtains the light source intensity control signal, and the IDU control processing module generates the light source current signal according to the light source intensity control signal, and outputs the light source current signal to the light source driving module. The light source driving module controls the light source according to the light source current signal. However, when the Sequence index corresponding to the frame c1 changes, the light source intensity control signal corresponding to the frame c1 is generated. Since it takes time to sample and analyze the light source intensity control signal, it will cause the control signal of the initial color segment in the frame display to be lost, resulting in the DMD screen display being misaligned. If the effect after the measured loss is acceptable, then this solution is feasible.

[0109] In order to solve the technical problem that the frame image c1 loses part of its frame time, resulting in the inability to align the DMD image display, the DLP control processing module can be delayed by one frame function. After the Sequence index of the frame image c1 changes, the light source intensity control signal of the next frame image c2 can be obtained, and the light source intensity control signal of the frame image c2 can be obtained when the Sequence index signal of the next frame c2 changes.

[0110] When the DLP control processing module monitors the change of the Frame Vsync signal corresponding to the frame image c3, the DLP control processing module generates a light source intensity control signal, and the IDU control processing module generates a light source current signal according to the light source intensity control signal, and outputs the light source current signal to the light source driving module, and the light source driving module controls the light source according to the light source current signal. Since the DLP control processing module obtains the Frame Vsync signal corresponding to the frame image c3 in advance of the Sequence index signal corresponding to the frame image c3 display, the problem of the light source control signal in the above scheme being unable to align with the DMD image display will not occur, and the light source brightness configuration parameters of the next frame image can be applied at the time of display of the frame image calculated by the fixed time difference, so it has better application real-time performance.

[0111] Since the DLP control processing module obtains the Frame Vsync signal corresponding to frame image c4 in advance of the Sequence index signal corresponding to frame image c4, when the level of the Frame Vsync signal of frame image c4 is monitored to change, the light source intensity control signal of frame image c4 is read; when the level of the Sequence index signal of the frame image is monitored to change, the actual light source control is performed according to the light source intensity control signal of frame image c4.

[0112] S450, when the projection time point of the frame picture arrives, control the light source to emit light according to the current control signal, and control the digital microlens device to operate according to the jitter ratio to project the frame picture.

[0113] The description of S450 refers to the description of S140 above and will not be repeated here.

[0114] In this embodiment, the acquisition time point is determined according to the boundary indication signal corresponding to the frame image and the frame image sequence signal, so that the light source intensity control signal and the jitter ratio corresponding to the digital microlens device can be accurately acquired at the acquisition time point, so that the control effect of the projection control process is better.

[0115] Reference Figure 8 , Figure 8 A block diagram of a projection control device proposed in one embodiment of the present application is shown, which is used for a projector including a light source and a digital microlens device. The device 1100 includes:

[0116] A calculation module 1110 is used to calculate a light source intensity control parameter and a jitter ratio of a digital micromirror device according to a frame image to be projected, and the light source intensity control parameter is sent via a light source intensity control signal;

[0117] An acquisition module 1120 is used to acquire a light source intensity control signal to acquire a light source intensity control parameter corresponding to a frame image when an acquisition time point corresponding to a frame image to be projected arrives;

[0118] A sending module 1130, configured to send a current control signal of a light source when a sending time point corresponding to a frame to be projected arrives, wherein at least part of the current control signal is determined according to a light source intensity control parameter;

[0119] The control module 1140 is used to control the light source to emit light according to the current control signal when the projection time point of the frame picture arrives, and control the operation of the digital microlens device according to the jitter ratio to project the frame picture.

[0120] Optionally, when the frame picture sequence index signal is used as the guide signal, the acquisition module 1120 is also used to monitor the frame picture sequence index signal, and take the moment when the frame picture sequence index signal changes as the first moment, and collect the light source intensity control signal after a first delay on the basis of the first moment to obtain the light source intensity control parameter corresponding to the frame picture; the moment when the light source intensity control signal changes for the first time after the first moment is taken as the second moment, wherein the moment corresponding to the first delay is between the first moment and the second moment.

[0121] Optionally, the light source includes multiple sub-light sources with different luminous colors, and the multiple sub-light sources emit light in corresponding color segments respectively; when the frame picture sequence index signal is used as the guidance signal, the sending module 1130 is also used to monitor that after the frame picture sequence index signal changes again, a current control signal determined according to the light source control parameters is sent to part of all sub-light sources within the first spoke period.

[0122] Optionally, the light source includes multiple sub-light sources with different luminous colors, and the multiple sub-light sources emit light in corresponding color segments respectively; when the frame picture sequence index signal is used as the guidance signal, the sending module 1130 is also used to monitor that after the frame picture sequence index signal changes again, it sends the current control signal determined by the light source control parameters to the part of the sub-light source that emits light in the subsequent color segment in each spoke period.

[0123] Optionally, when a boundary indication signal is used as a guide signal, the acquisition module 1120 is also used to monitor the boundary indication signal, and the moment when the boundary indication signal changes is taken as the third moment, and the light source intensity control signal is collected after the second delay on the basis of the third moment to obtain the light source intensity control parameter corresponding to the frame image; the moment when the light source intensity control signal changes for the first time after the third moment is taken as the fourth moment, wherein the moment corresponding to the second delay is after the fourth moment.

[0124] Optionally, the light source includes multiple sub-light sources with different luminous colors, and the multiple sub-light sources emit light in corresponding color segments respectively. The sending module 1130 is also used to send a current control signal determined according to the light source control parameters to part of all sub-light sources within the first spoke period after a third delay based on the third moment.

[0125] Optionally, the light source includes multiple sub-light sources with different luminous colors, and the multiple sub-light sources emit light in corresponding color segments respectively. The sending module 1130 is also used to send a current control signal determined by the light source control parameters to the part of the sub-light source that emits light in the subsequent color segment in each spoke period after a third delay based on the third moment.

[0126] Optionally, when the frame picture sequence index signal and the boundary indication signal are used as the guidance signal, the acquisition module 1120 is also used to monitor the level change of the boundary guidance signal, and take the moment when the boundary guidance signal changes as the third moment. On the basis of the third moment, after a second delay, the light source intensity control signal is collected to obtain the light source intensity control parameters corresponding to the frame picture.

[0127] Optionally, the light source includes multiple sub-light sources with different luminous colors, and the multiple sub-light sources emit light in corresponding color segments respectively. The sending module 1130 is also used to send a current control signal determined according to the light source control parameters to part of all the sub-light sources within the first spoke cycle after monitoring the change of the frame sequence index signal after the third moment.

[0128] Optionally, the light source includes a plurality of sub-light sources with different luminous colors, and the plurality of sub-light sources emit light in corresponding color segments respectively. When a frame picture sequence index signal and a boundary indication signal are used as guidance signals, the sending module 1130 is also used to monitor the occurrence of changes in the frame picture sequence index signal after a third moment, and then send a current control signal determined by the light source control parameters to the part of the sub-light source that emits light in subsequent color segments in each spoke period.

[0129] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and modules can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0130] In several embodiments provided in the present application, the coupling or direct coupling or communication connection between the modules shown or discussed may be an indirect coupling or communication connection through some interfaces, devices or modules, which may be electrical, mechanical or other forms.

[0131] In addition, each functional module in each embodiment of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or software functional modules.

[0132] Reference Fig. 9 , Fig. 9 A block diagram of a projector proposed in another embodiment of the present application is shown. The projector 1200 may include one or more of the following components: a processor 1210, a memory 1220, and one or more application programs, wherein the one or more application programs may be stored in the memory 1220 and configured to be executed by the one or more processors 1210, and the one or more programs are configured to execute the method described in the aforementioned method embodiment.

[0133] The processor 1210 may include one or more processing cores. The processor 1210 uses various interfaces and lines to connect the various parts of the entire projector 1200, and executes various functions of the projector 1200 and processes data by running or executing instructions, programs, code sets or instruction sets stored in the memory 1220, and calling data stored in the memory 1220. Optionally, the processor 1210 can be implemented in at least one hardware form of digital signal processing (DSP), field-programmable gate array (FPGA), and programmable logic array (PLA). The processor 110 can integrate one or a combination of a central processing unit (CPU), a graphics processing unit (GPU), and a modem. Among them, the CPU mainly processes the operating system, user interface, and application programs; the GPU is responsible for rendering and drawing display content; and the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor 1210, but may be implemented separately through a communication chip.

[0134] The memory 1220 may include a random access memory (RAM) or a read-only memory (ROM). The memory 1220 may be used to store instructions, programs, codes, code sets or instruction sets. The memory 1220 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the following various method embodiments, etc. The data storage area may also store data (such as a phone book, audio and video data, chat record data) created by the terminal 1200 during use.

[0135] In addition, in this embodiment, the projector may further include a light source (not shown) and a digital microlens device (not shown), and the light source may include a plurality of sub-light sources, and the light emission colors of each purple light source may be different.

[0136] Please refer to Fig.10 , Fig.10 The structure block diagram of a computer-readable storage medium in an embodiment of the present application is shown. The computer-readable medium 800 stores program codes, which can be called by a processor to execute the method described in the above method embodiment.

[0137] The computer readable storage medium 800 may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read-only memory), an EPROM, a hard disk, or a ROM. Optionally, the computer readable storage medium 800 includes a non-transitory computer-readable storage medium. The computer readable storage medium 800 has storage space for program code 810 that performs any method step of the above method. These program codes can be read from or written to one or more computer program products. The program code 810 can be compressed, for example, in an appropriate form.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A projection control method, characterized in that: For a projector including a light source and a digital microlens device, the method comprising: Calculating a light source intensity control parameter and a jitter ratio of a digital micromirror device according to a frame image to be projected, wherein the light source intensity control parameter is sent down via a light source intensity control signal; When the acquisition time point corresponding to the frame picture to be projected arrives, the light source intensity control signal is acquired to obtain the light source intensity control parameter corresponding to the frame picture; When the sending time point corresponding to the frame to be projected arrives, sending the current control signal of the light source, at least part of the current control signal is determined according to the light source intensity control parameter; When the projection time point of the frame picture arrives, the light source is controlled to emit light according to the current control signal, and the digital microlens device is controlled to operate according to the jitter ratio to project the frame picture.

2. The method according to claim 1, characterized in that When the frame picture sequence index signal is used as the guide signal, when the acquisition time point corresponding to the frame picture to be projected arrives, the light source intensity control signal corresponding to the frame picture is obtained, including: Monitoring the frame picture sequence index signal, taking the moment when the frame picture sequence index signal changes as the first moment, and collecting the light source intensity control signal after a first delay based on the first moment to obtain the light source intensity control parameter corresponding to the frame picture; The moment when the light source intensity control signal changes for the first time after the first moment is taken as the second moment, wherein the moment corresponding to the first delay is between the first moment and the second moment.

3. The method according to claim 2, characterized in that The light source includes a plurality of sub-light sources with different luminous colors, and the plurality of sub-light sources emit light in corresponding color segments respectively; when a frame picture sequence index signal is used as a guide signal, when a corresponding sending time point of a frame picture to be projected arrives, a current control signal of the light source is sent, including: After monitoring that the frame picture sequence index signal changes again, the current control signals determined according to the light source control parameters are sent to all sub-light sources within the first spoke period.

4. The method according to claim 2, characterized in that: The light source includes a plurality of sub-light sources with different luminous colors, and the plurality of sub-light sources emit light in corresponding color segments respectively; when the frame image sequence index signal is used as the guide signal, when the corresponding sending time point of the frame image to be projected arrives, the current control signal of the light source sent includes: After monitoring that the frame picture sequence index signal changes again, the current control signal determined according to the light source control parameter is sent to the part of the sub-light sources emitting light in the subsequent color segment in each spoke period.

5. The method according to claim 1, characterized in that When the boundary indication signal is used as the guide signal, when the acquisition time point corresponding to the frame image to be projected arrives, obtaining the light source intensity control signal corresponding to the frame image includes: monitoring the boundary indication signal, taking the moment when the boundary indication signal changes as the third moment, and collecting the light source intensity control signal after a second delay based on the third moment to obtain the light source intensity control parameter corresponding to the frame image; The first change moment of the light source intensity control signal after the third moment is taken as the fourth moment, wherein the moment corresponding to the second delay is located after the fourth moment.

6. The method according to claim 5, characterized in that The light source includes a plurality of sub-light sources with different luminous colors, and the plurality of sub-light sources emit light in corresponding color segments respectively. When a corresponding sending time point of a frame image to be projected arrives, a current control signal of the light source is sent, including: On the basis of the third moment, after a third delay, the current control signals of the part of all sub-light sources determined according to the light source control parameters are sent down in the first spoke period.

7. The method according to claim 5, characterized in that The light source includes a plurality of sub-light sources with different luminous colors, and the plurality of sub-light sources emit light in corresponding color segments respectively. When a corresponding sending time point of a frame image to be projected arrives, a current control signal of the light source is sent, including: On the basis of the third moment, after a third delay, a current control signal determined according to the light source control parameter is issued to the portion of sub-light sources emitting light in the subsequent color segment in each spoke period.

8. The method according to claim 1, characterized in that When the frame sequence index signal and the boundary indication signal are used as the guide signal, When the acquisition time point corresponding to the frame picture to be projected arrives, obtaining the light source intensity control signal corresponding to the frame picture includes: Monitor the level change of the boundary indicator signal, take the moment when the boundary indicator signal changes as the third moment, and collect the light source intensity control signal after a second delay based on the third moment to obtain the light source intensity control parameter corresponding to the frame image.

9. The method according to claim 8, characterized in that The light source includes a plurality of sub-light sources with different luminous colors, and the plurality of sub-light sources emit light in corresponding color segments respectively. When the corresponding sending time point of the frame picture to be projected arrives, the current control signal of the light source is sent down, including: After the frame picture sequence index signal is monitored to change after the third moment, the current control signal determined according to the light source control parameter is sent to all sub-light sources in the first spoke cycle.

10. The method according to claim 8, characterized in that The light source includes a plurality of sub-light sources of different luminous colors, and the plurality of sub-light sources emit light in corresponding color segments respectively. When the frame image sequence index signal and the boundary indication signal are used as the guide signal, when the corresponding sending time point of the frame image to be projected arrives, the current control signal of the light source is sent down, including: After the frame picture sequence index signal is monitored to change after the third moment, a current control signal determined according to the light source control parameter is issued to the portion of sub-light sources emitting light in the subsequent color segment in each spoke period.

11. A projection control device, characterized in that: It is characterized in that For a projector comprising a light source and a digital microlens device; the device comprising: A calculation module, used for calculating a light source intensity control parameter and a jitter ratio of a digital micromirror device according to a frame image to be projected, wherein the light source intensity control parameter is sent down via a light source intensity control signal; An acquisition module, used for acquiring a light source intensity control signal to acquire a light source intensity control parameter corresponding to a frame image to be projected when an acquisition time point corresponding to the frame image to be projected arrives; A sending module, used for sending a current control signal of the light source when a sending time point corresponding to a frame image to be projected arrives, wherein at least part of the current control signal is determined according to the light source intensity control parameter; The control module is used to control the light source to emit light according to the current control signal when the projection time point of the frame picture arrives, and control the operation of the digital microlens device according to the jitter ratio to project the frame picture.

12. A projector, characterized in that: include: one or more processors; Memory; One or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs are configured to execute the method according to any one of claims 1-10.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores program code, wherein when the program code is executed by a processor, the method according to any one of claims 1 to 10 is executed.

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