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: determining a dynamic pure black pulse width modulation signal corresponding to a to-be-projected frame picture; determining a target driving current corresponding to a target light source in the plurality of light sources according to the dynamic pure black pulse width modulation signal; determining a target current combination pair including the target driving current in the white balance calibration current set; and controlling the target light source to emit light according to the target driving current, and controlling other light sources to emit light according to the driving current of other light sources in the target current combination pair so as to project a frame picture. In the invention, the driving current of different light sources is determined from the white balance calibration current set according to the target driving current of the target power supply, and is not the product of the dynamic pure black pulse width modulation signal and the maximum current, so that the determined driving current of the light source is more matched with the actual display color of the frame picture; therefore, the display effect of the projected frame picture is improved.

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] Currently, in teaching or meetings, during the projection process of the projector, the projector can determine the pulse width modulation according to the frame image, and then calculate the duty cycle of the pulse width modulation and the product of the maximum current of each light source with different light colors in the projector as the target current of each light source. The projector then controls each light source to emit light according to the target current of each light source to project the projection frame image.

[0003] However, the color coordinates of different light sources vary within a certain range under different current intensities, and the brightness does not change linearly. Therefore, simply changing the current in proportion to multiple light sources will lead to inaccurate white balance of the picture at different brightness, further resulting in poor display effect of the projected frame picture. Summary of the invention

[0004] In view of the above problems, the present application proposes a projection control method, device, projector and storage medium, which can improve the display effect of the projected frame image.

[0005] In a first aspect, an embodiment of the present application provides a projection control method for a projector including a plurality of light sources with different light colors; the method comprises:

[0006] Determine a dynamic pure black pulse width modulation signal corresponding to the frame image to be projected;

[0007] Determining a target driving current corresponding to a target light source among the multiple light sources according to a dynamic pure black pulse width modulation signal;

[0008] Determine a target current combination pair including a target driving current in the white balance calibration current set, each current combination pair in the white balance calibration current set including a driving current corresponding to the target light source and a driving current corresponding to other light sources; the other light sources refer to light sources other than the target light source among the multiple light sources;

[0009] The target light source is controlled to emit light according to the target driving current, and the other light sources are controlled to emit light according to the driving currents of the other light sources in the target current combination pair, so as to project a frame picture.

[0010] In a second aspect, an embodiment of the present application provides a projection control device for a projector including a plurality of light sources with different light colors; the device includes:

[0011] A first determination module is used to determine a dynamic pure black pulse width modulation signal corresponding to a frame image to be projected;

[0012] A second determination module is used to determine a target driving current corresponding to a target light source among the multiple light sources according to the dynamic pure black pulse width modulation signal;

[0013] A third determination module is used to determine a target current combination pair including a target driving current in the white balance calibration current set, each current combination pair in the white balance calibration current set including a driving current corresponding to a target light source and a driving current corresponding to other light sources; the other light sources refer to light sources other than the target light source among the multiple light sources;

[0014] The control module is used to control the target light source to emit light according to the target driving current, and to control the other light sources to emit light according to the driving current of the other light sources in the target current combination pair, so as to project a frame picture.

[0015] In a third aspect, an embodiment of the present application provides a projector, including:

[0016] one or more processors;

[0017] Memory;

[0018] 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.

[0019] 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.

[0020] The embodiments of the present application provide a projection control method, device, projector and storage medium. In the present application, the driving current of different light sources is determined from a white balance calibration current set according to a target driving current of a target power supply, and does not change in proportion, so that the color temperature of the emitted light at different brightness levels can be corrected to normal parameters, thereby reducing the color cast of the picture, which is beneficial to solving the white balance abnormality of the picture. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 A flow chart of a projection control method proposed in an embodiment of the present application is shown.

[0023] Figure 2 A structural block diagram of a projector in an embodiment of the present application is shown.

[0024] Figure 3 A schematic diagram of a pulse width modulation signal in an embodiment of the present application is shown.

[0025] Figure 4 A schematic diagram showing the light emitting period of each light source in an embodiment of the present application is shown.

[0026] Figure 5 A flowchart of a projection control method proposed in yet another embodiment of the present application is shown.

[0027] Figure 6 A schematic diagram of a projection control process in an embodiment of the present application is shown.

[0028] Figure 7 A block diagram of a projection control device proposed in one embodiment of the present application is shown.

[0029] Figure 8 A block diagram of a projector proposed in yet another embodiment of the present application is shown.

[0030] Fig. 9 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 plurality of light sources with different light colors. The method includes:

[0034] S110, determining a dynamic pure black pulse width modulation signal corresponding to the frame image to be projected.

[0035] In this embodiment, the structure of the projector can refer to Figure 2As 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: parses and processes the signal of the input frame image, and outputs related image signals (dynamic pure black pulse width modulation signal and jitter ratio, etc.), the IDU control processing module 203: parses 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 to obtain the dynamic black pulse width modulation signal (DynamicBlackPWM) corresponding to the frame and the jitter ratio corresponding to the digital microlens device.

[0039] 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.

[0040] The DLP control processing module can analyze the signal of the frame image to obtain a frame image sequence of the frame image, and then determine the brightness data of the frame image based on the frame image sequence. The DLP control processing module determines the jitter ratio of the digital microlens device and the dynamic pure black pulse width modulation signal based on the brightness data of the frame image.

[0041] Among them, the frame 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 sequence includes a sequence composed of red pure color frame pictures, blue pure color frame pictures and green pure color frame pictures.

[0042] S120 , determining a target driving current corresponding to a target light source among the multiple light sources according to the dynamic pure black pulse width modulation signal.

[0043] In this embodiment, one light source may be selected from the multiple light sources as the target light source. For example, when the multiple light sources include a red light source, a green light source, and a blue light source, the target light source may be a green light source or a blue light source.

[0044] When the target light source is a green light source, since the green light source is the light source that mainly contributes to the brightness, when the target light source is green light, the brightness can be maintained to a greater extent while maintaining the white balance, thereby reducing power consumption.

[0045] The IDU control processing module may calculate the product of the duty cycle and the maximum current of the target light source as the specific value of the target driving current corresponding to the target light source.

[0046] S130 , determining a target current combination pair including a target driving current in the white balance calibration current set.

[0047] Each current combination pair in the white balance calibration current set includes a driving current corresponding to the target light source and a driving current corresponding to other light sources; other light sources refer to light sources other than the target light source among the multiple light sources. The white balance calibration current set may be in a table form.

[0048] For example, when the multiple light sources include a red light source, a green light source and a blue light source, and the target light source is a green light source, each current combination pair in the white balance calibration current set includes the driving currents corresponding to the red light source, the green light source and the blue light source, respectively, and the red light source and the blue light source serve as other light sources.

[0049] The IDU control processing module may determine a target current combination pair including the target driving current in the white balance calibration current set, wherein the current combination pair including the target driving current may be determined as the target current combination pair.

[0050] In this embodiment, the method for obtaining a white balance calibration current set may include: obtaining a maximum driving current and a minimum driving current of a target light source; determining a plurality of first driving currents based on the maximum driving current and the minimum driving current; obtaining a color coordinate value of the target light source corresponding to each first driving current, the color coordinate value of the first driving current refers to the color coordinate value of the target light source when the target light source emits light according to the first driving current; determining a second driving current of other light sources corresponding to each first driving current based on the color coordinate value of each first driving current and a preset white balance value; and constructing a white balance calibration current set based on each first driving current and the second driving current of other light sources corresponding to each first driving current.

[0051] The current interval of the driving current of the target light source may be determined according to the maximum driving current and the minimum driving current of the target light source, and then the current interval is divided into a plurality of sub-intervals of equal size, and the boundary value of the first sub-interval and the maximum boundary value of each other sub-interval are determined as a plurality of first driving currents. For example, the current interval is divided into 63 sub-intervals, the minimum boundary value of the first sub-interval (that is, the minimum driving current) is obtained as a first driving current, and the maximum boundary value of each sub-interval is obtained as a first driving current, so as to obtain 64 first driving currents.

[0052] For each first driving current, the target light source is controlled to emit light according to the first driving current, and the color coordinate value of the target light source is obtained as the color coordinate value of the first driving current. In other words, the driving current of the target light source is divided into multiple first driving currents, and other light sources correspond to the second driving current for each first driving current. When the target light source is driven to emit light according to the first driving current and when other light sources are driven to emit light according to the second driving current corresponding to the first driving current, the brightness of the light output by the projector as a whole is displayed as a brightness level corresponding to a current combination pair, that is, each current combination pair corresponds to a brightness level.

[0053] The preset white balance value may be a value set by the user based on demand, and may include a standard white field color coordinate or a preset white balance color coordinate. The preset color temperature mode may be set based on the user's setting operation and demand, and then when the combined light emitted by multiple light sources is controlled to meet the preset color temperature mode, the white balance value of the combined light is obtained as the preset white balance value. The preset color temperature mode may include a warm color mode, a cool color mode, and a standard color temperature mode, etc., which are not specifically limited in this application.

[0054] In this embodiment, when the combined light emitted by the multiple light sources meets the standard color temperature mode, the color coordinates of the light output by the projector as a whole are standard white field coordinates, when the combined light emitted by the multiple light sources meets the warm color mode, the color coordinates of the light output by the projector as a whole are preset white balance color coordinates in the warm color mode, and when the combined light emitted by the multiple light sources meets the cold color mode, the color coordinates of the light output by the projector as a whole are preset white balance color coordinates in the cold color mode. In other words, when the multiple light sources emit light according to the current combination centering driving current, the color coordinates of the light output by the projector as a whole are standard white field color coordinates (satisfying the standard color temperature mode) or preset white balance color coordinates (satisfying the warm color temperature mode or satisfying the cold color temperature mode).

[0055] After the preset color temperature mode is obtained, the driving current of each other light source can be determined according to the color coordinate value of each first driving current and the preset white balance value, as the second driving current of the other light source corresponding to each first driving current.

[0056] For example, the target light source is a green light source, and the other light sources are a red light source and a blue light source; for the blue light source, the driving current of the blue light source is determined according to the preset white balance value and the color coordinate value of the first driving current, as the second driving current of the blue light source for the first driving current; for the red light source, the driving current of the red light source is determined according to the preset white balance value and the color coordinate value of the first driving current, as the second driving current of the red light source for the first driving current.

[0057] After traversing each first driving current and each other light source, each first driving current and the second driving current of each other light source corresponding to each first driving current are obtained. For each first driving current under the target light source, a current combination pair is constructed according to the first driving current and the second driving current of each other light source corresponding to the first driving current. All the first driving currents are traversed to obtain various current combination pairs, and all the current combination pairs are merged into a set to obtain a white balance calibration current set.

[0058] For example, the target light source is a green light source, and the other light sources are a blue light source and a red light source. The green light source corresponds to 64 first driving currents. For each first driving current, the color coordinate value of the first driving current is calculated, and the second driving current of the blue light source corresponding to the first driving current and the second driving current of the red light source corresponding to the first driving current are determined according to the color coordinate value of the first driving current and the preset white balance value. According to the first driving current of the green light source, the second driving current of the blue light source corresponding to the first driving current, and the second driving current of the red light source corresponding to the first driving current, a current combination pair is constructed, and the 64 first driving currents corresponding to the green light source are traversed in this way to obtain 64 current combination pairs, and the 64 current combination pairs are used as a white balance calibration current set. The white balance calibration current set is shown in Table 1, which is as follows:

[0059] Table 1

[0060]

[0061] Currentx for the green light source refers to the xth first driving current, Currentx for the red light source refers to the second driving current corresponding to the xth first driving current, and Currentx for the blue light source refers to the second driving current corresponding to the xth first driving current, that is, the three driving currents in each row in Table 1 are a current combination pair.

[0062] As described above, the user can set different color temperature modes based on the needs, and determine different preset white balance values ​​for different color temperature modes, so that the white balance calibration current sets corresponding to the different color temperature modes can be obtained. Accordingly, S130 may include: obtaining the target color temperature mode of the current projector; obtaining the white balance calibration current set corresponding to the target color temperature mode as the target set; and determining the target current combination pair including the target drive current in the target set.

[0063] For example, the target color temperature mode is a cool color mode, and from the white balance calibration current set a1 corresponding to the cool color mode, the white balance calibration current set a2 corresponding to the warm color mode, and the white balance calibration current set a3 corresponding to the standard color temperature mode, the white balance calibration current set a1 corresponding to the cool color mode is taken as the target set, and then a current combination pair including the target driving current in the target set is determined as the target current combination pair.

[0064] S140, controlling the target light source to emit light according to the target driving current, and controlling other light sources to emit light according to the driving currents of other light sources in the target current combination pair, so as to project a frame image.

[0065] After the target current combination pair is obtained, the target light source is controlled to emit light according to the target driving current, and the other light sources are controlled to emit light according to the driving currents of the other light sources in the target current combination pair.

[0066] For example, the target light source includes a green light source, and the other light sources include a red light source and a blue light source. The green light source is controlled to emit light according to the target driving current, and the red light source is controlled to emit light according to the driving current of the red light source in the target current combination, and the blue light source is controlled to emit light according to the driving current of the blue light source in the target current combination.

[0067] As an implementation manner, the process of emitting light from a plurality of light sources may include: configuring each light source respectively by its own driving current, so that each light source emits light according to the configured driving current.

[0068] In one embodiment, the light-emitting period of each light source can also be determined according to the frame sequence, and there is a non-light-emitting period between the light-emitting periods of different light sources; at this time, when the projection time point of the frame is reached, each light source is configured according to its own driving current through the IDU control processing module, and then the IDU control processing module sends the configured driving current of each light source to the light source driving module, and the light source driving module controls each light source to emit light according to the configured driving current of each light source, and the light-emitting time of each light source is the display time.

[0069] like Figure 4 As shown, the frame sequence index signal 1 is the projection time point of the frame 1, the frame sequence index signal 2 is the projection time point of the frame 2, the frame sequence index signal 3 is the projection time point of the 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 red light-emitting period, the green light-emitting period, and the blue light-emitting period, respectively. The non-luminous period between the first light-emitting period of the frame 1 (the light-emitting period of the red light source) and the last light-emitting period of the previous frame (the light-emitting period of the blue light source) is the non-luminous period 1, and so on, to obtain the non-luminous periods 2-7. Each light source can be configured separately by the respective driving current of each light source at the arrival time of the frame sequence index signal 1 (which can also be the non-luminous period 1). At the arrival moment of the frame picture sequence index signal 1, that is, during the non-luminous period 1, each light source can be configured separately by using the respective driving current of each light source under the frame picture 1, so that each 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, during the non-luminous period 4, each light source can be configured separately by using the respective driving current of each light source under the frame picture 2, so that each light source emits light according to its respective configured current within the frame duration of the frame picture 2.

[0070] As an implementation mode, the process of controlling the power supply to emit light may also include: for each light source, configuring the light source through a driving current corresponding to the light source during a non-lighting period before the light-emitting period of the light source, so that the light source emits light according to the configured driving current during the light-emitting period of the light source.

[0071] At this time, for each light source, in the non-light-emitting period before the light-emitting period of the light source, the light source is configured according to the driving current of the light source through the IDU control processing module, and then the IDU control processing module sends the driving current after the configuration of the light source to the light source driving module. The light source driving module controls the light source to emit light in the light-emitting period of the light source according to the driving current after the configuration of the light source, and the light-emitting duration of each light source is the duration of the light-emitting period of each light source.

[0072] For example, Figure 4 As shown, the red light source can be configured according to the driving current of the red light source under the frame picture 1 at the non-luminous time 1, the green light source can be configured according to the driving current of the green light source under the frame picture 1 at the non-luminous time 2, and the blue light source can be configured according to the driving current of the blue light source under the frame picture 1 at the non-luminous time 3. Similarly, the red light source can be configured according to the driving current of the red light source under the frame picture 2 at the non-luminous time 4, the green light source can be configured according to the driving current of the green light source under the frame picture 2 at the non-luminous time 5, and the blue light source can be configured according to the driving current of the blue light source under the frame picture 2 at the non-luminous time 6.

[0073] In this embodiment, the driving current of different light sources is determined from the white balance calibration current set according to the target driving current of the target power supply, and is not the product of the dynamic pure black pulse width modulation signal and the maximum current. This makes the determined driving current of the light source more consistent with the actual display color of the frame image, thereby improving the display effect of the projected frame image.

[0074] Reference Figure 5 , Figure 5 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 plurality of light sources with different light colors. The method includes:

[0075] S210, determining frame picture brightness data of the frame picture; determining a dynamic pure black pulse width modulation signal according to the brightness calibration value set and the frame picture brightness data.

[0076] The brightness calibration value set includes a plurality of brightness combination pairs, each brightness combination pair corresponds to a current combination pair, and each brightness combination pair includes a plurality of brightness data corresponding to when a plurality of light sources emit light according to respective driving currents in the corresponding current combination pair. The brightness calibration value set may be in a table form. For example, the brightness combination pair LD1 includes the brightness s1 of the red light source, the brightness s2 of the green light source, and the brightness s3 of the blue light source. The current combination pair DL1 corresponding to the brightness combination pair LD1 includes the driving current t1 of the red light source, the driving current t2 of the green light source, and the driving current t3 of the blue light source. When the red light source is driven to emit light according to the driving current t1, the brightness of the light emitted by the red light source is s1. When the green light source is driven to emit light according to the driving current t2, the brightness of the light emitted by the green light source is s2. When the blue light source is driven to emit light according to the driving current t3, the brightness of the light emitted by the blue light source is s3.

[0077] The brightness calibration value set can be stored in the DLP control processing module. After the DLP control processing module obtains the signal of the frame picture, it processes the signal of the frame picture and the frame picture brightness data of the frame picture, and then determines the dynamic pure black pulse width modulation signal based on the brightness calibration value set and the frame picture brightness data.

[0078] In this embodiment, the method for obtaining the brightness calibration value set includes: controlling the target light source to emit light according to the driving current of the target light source in each current combination pair, and obtaining the brightness data of the target light source corresponding to each current combination pair; controlling the other light sources to emit light according to the driving current of the other light sources in each current combination pair, and obtaining the brightness data of the other light sources corresponding to each current combination pair; obtaining and summarizing the brightness data of the target light source and other light sources corresponding to each current combination pair, and obtaining the brightness calibration value set. It can be seen that each current group corresponds to a brightness combination pair, and the brightness display effect displayed by the brightness data of each light source in each brightness combination pair can be used as a brightness level. For example, if the current combination pairs include 10, the corresponding brightness combination pairs include 10, and the brightness levels also include 10.

[0079] For each current combination pair in the white balance calibration current set, the target light source is controlled to emit light according to the driving current of the target power source in the current combination pair to obtain the brightness data of the target light source, and the other light sources are controlled to emit light according to the driving current of the other light sources in the current combination pair to obtain the brightness data of the other light sources, and the brightness data of the other light sources under each current combination pair and the brightness data of the target light source are summarized into a current combination pair to obtain the brightness current combination pair under the current combination pair, and the brightness current combination pairs corresponding to all current combination pairs are summarized to obtain the brightness calibration value set. Obviously, a white balance current calibration value set determines a brightness calibration value set.

[0080] For example, the brightness calibration value set constructed according to the above Table 1 can refer to Table 2, which is as follows:

[0081] Table 2

[0082]

[0083] Wherein, Brightness x is the brightness data of the xth driving current in Table 1.

[0084] When there are multiple color temperature modes, each color temperature mode corresponds to a respective brightness calibration value set and a white balance calibration current set.

[0085] Similarly, a dynamic pure black pulse width modulation signal is determined based on a brightness calibration value set and frame picture brightness data, including: obtaining a target color temperature mode of the current projector; obtaining a brightness calibration value set corresponding to the target color temperature mode as a target brightness calibration value set; and determining a dynamic pure black pulse width modulation signal based on the target brightness calibration value set and frame picture brightness data.

[0086] According to the target color temperature mode set for the projector, a target brightness calibration value set corresponding to the target color temperature mode can be determined, and a dynamic pure black pulse width modulation signal can be determined according to the target brightness calibration value set and frame picture brightness data.

[0087] In this embodiment, the driving current in the white balance calibration current set is actually the product of the maximum driving current of the light source and the duty cycle of the dynamic pure black pulse width modulation signal. At this time, the current duty cycle set can also be determined based on the white balance calibration current set. Therefore, a white balance current calibration value set determines a current duty cycle set.

[0088] For example, the current duty cycle set determined according to the white balance calibration current set shown in Table 1 is shown in Table 3. Table 3 is as follows:

[0089] Table 3

[0090]

[0091] Wherein, Duty x is the duty cycle of the xth driving current in Table 1.

[0092] Similarly, when there are multiple color temperature modes, each color temperature mode corresponds to its own brightness calibration value set, white balance calibration current set, and current duty cycle set.

[0093] When the brightness calibration value set, the white balance calibration current set, and the current duty cycle set are respectively shown in Table 1, Table 2, and Table 3, the relationship among the brightness calibration value set, the white balance calibration current set, and the current duty cycle set is shown in Table 4. Table 4 is as follows:

[0094] Table 4

[0095]

[0096] Among them, R, G, and B are red light source, green light source, and blue light source respectively, and the data in each row of Table 4 is a group of data with a corresponding relationship.

[0097] S220, determining a target driving current corresponding to a target light source among the multiple light sources according to the dynamic pure black pulse width modulation signal; and determining a target current combination pair including the target driving current in the white balance calibration current set.

[0098] The description of S220 refers to the description of S110 to S130 above, which will not be repeated here.

[0099] S230 , determining a jitter ratio corresponding to the digital microlens device according to the frame picture brightness data and the brightness calibration value set.

[0100] In this embodiment, the projector also includes a digital microlens device; after determining the frame image brightness data and the brightness calibration value set, the DLP control processing module can also determine the jitter ratio of the digital microlens according to the frame image brightness data and the brightness calibration value set.

[0101] 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.

[0102] The signal input module sends the signal of each frame to the DLP control processing module in turn. The DLP control processing module determines the frame brightness data of each frame according to the signal of each frame, and then determines the dynamic pure black pulse width modulation signal and the corresponding jitter ratio of the digital microlens device according to the frame brightness data and the brightness calibration value set.

[0103] S240, controlling the operation of the digital microlens device according to the jitter ratio, controlling the target light source to emit light according to the target driving current, and controlling other light sources to emit light according to the driving currents of other light sources in the target current combination pair, so as to project a frame image.

[0104] The light source emits light as described in S150 above, which will not be described again here. After the jitter ratio is obtained, the power source is controlled to emit light according to the driving current, and the digital microlens device is controlled to operate, and the frame image is projected on the projection area of ​​the projector through the reflection imaging of the digital microlens device to obtain a projection image.

[0105] based on Figure 2 The projector structure shown in FIG. 1 is a projection control process of the embodiment. Figure 6 As shown, including:

[0106] S601: constructing a brightness calibration value set and a white balance calibration current set according to the maximum current and the minimum current of each light source, storing the brightness calibration value set in the DLP control processing module, and storing the white balance calibration current set in the IDU control processing module;

[0107] S602: The signal input module obtains a frame image and sends a signal of the frame image to the control processing module. The DLP control processing module determines the frame image brightness data according to the signal of the frame image, and determines the dynamic pure black pulse width modulation signal and the DMD jitter ratio according to the brightness calibration value set and the frame image brightness data.

[0108] S603: The DLP control processing module sends the dynamic pure black pulse width modulation signal and the frame sequence of each light source corresponding to the frame to the IDU control processing module, and sends the DMD jitter ratio to the DMD;

[0109] S604: The IDU control processing module determines the target driving current according to the dynamic pure black pulse width modulation signal, determines the target current combination pair according to the white balance calibration current set and the target driving current, and configures each light source according to the driving current in the target current combination pair, and finally determines the light-emitting period and the non-light-emitting period of each light source according to the frame sequence of each light source;

[0110] S605: The light source current driving module controls each light source to emit light according to the configured driving current, light-emitting period and non-light-emitting period of each light source;

[0111] S606: Controlling the DMD operation according to the DMD jitter ratio;

[0112] S607: Project the frame image to obtain a projection image.

[0113] In this embodiment, a brightness calibration value set is also provided in the projector. The dynamic pure black pulse width modulation signal determined according to the brightness calibration value set is more diverse, so that the target driving current determined according to the dynamic pure black pulse width modulation signal is also more diverse, thereby improving the diversity of the determined target driving current, making the accuracy of the target driving current higher, and further making the driving current of the light source determined according to the target driving current more consistent with the actual display color of the frame picture, thereby further improving the display effect of the projected frame picture.

[0114] Reference Figure 7 , Figure 7A 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 plurality of light sources with different light colors; the device 1100 includes:

[0115] A first determination module 1110 is used to determine a dynamic pure black pulse width modulation signal corresponding to a frame image to be projected;

[0116] A second determination module 1120 is used to determine a target driving current corresponding to a target light source among the multiple light sources according to the dynamic pure black pulse width modulation signal;

[0117] A third determining module 1130 is used to determine a target current combination pair including a target driving current in the white balance calibration current set, each current combination pair in the white balance calibration current set including a driving current corresponding to a target light source and a driving current corresponding to other light sources; the other light sources refer to light sources other than the target light source among the multiple light sources;

[0118] The control module 1140 is used to control the target light source to emit light according to the target driving current, and control the other light sources to emit light according to the driving current of the other light sources in the target current combination pair, so as to project a frame image.

[0119] Optionally, the first determination module 1110 is also used to determine the frame picture brightness data of the frame picture; determine the dynamic pure black pulse width modulation signal according to the brightness calibration value set and the frame picture brightness data; wherein the brightness calibration value set includes multiple brightness combination pairs, each brightness combination pair corresponds to a current combination pair, and each brightness combination pair includes multiple brightness data corresponding to when multiple light sources emit light according to their respective driving currents in the corresponding current combination pairs.

[0120] Optionally, the white balance calibration current set includes white balance calibration current sets for different color temperature modes; the third determination module 1130 is also used to obtain the target color temperature mode of the current projector; obtain the white balance calibration current set corresponding to the target color temperature mode as the target set; and determine a target current combination pair including a target drive current in the target set.

[0121] Optionally, the brightness calibration value set includes respective brightness calibration current sets for different color temperature modes; the first determination module 1110 is also used to obtain the target color temperature mode of the current projector; obtain the brightness calibration value set corresponding to the target color temperature mode as the target brightness calibration value set; determine the dynamic pure black pulse width modulation signal according to the target brightness calibration value set and the frame picture brightness data.

[0122] Optionally, the projector also includes a digital microlens device; the control module 1140 is further used to determine the jitter ratio corresponding to the digital microlens device according to the frame image brightness data and the brightness calibration value set; control the operation of the digital microlens device according to the jitter ratio, and control the target light source to emit light according to the target driving current, and control other light sources to emit light according to the driving current of other light sources in the target current combination, so as to project the frame image.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] Reference Figure 8 , Figure 8 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] Please refer to Fig. 9 , Fig. 9 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.

[0131] 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.

[0132] 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: A projector comprising a plurality of light sources having different light colors; the method comprising: Determine a dynamic pure black pulse width modulation signal corresponding to the frame image to be projected; Determining a target driving current corresponding to a target light source among the multiple light sources according to the dynamic pure black pulse width modulation signal; Determine a target current combination pair including the target driving current in a white balance calibration current set, each current combination pair in the white balance calibration current set including a driving current corresponding to the target light source and a driving current corresponding to other light sources; the other light sources refer to light sources other than the target light source among the multiple light sources; The target light source is controlled to emit light according to the target driving current, and the other light sources in the target current combination pair are controlled to emit light according to the driving current of the other light sources, so as to project the frame picture.

2. The method according to claim 1, characterized in that Each current combination pair corresponds to a brightness level. When the multiple light sources emit light according to the driving current in the current combination pair, the color coordinates of the overall output light of the projector are standard white field color coordinates or preset white balance color coordinates.

3. The method according to claim 2, characterized in that The step of determining a dynamic pure black pulse width modulation signal corresponding to a frame image to be projected includes: Determining frame picture brightness data of the frame picture; Determine a dynamic pure black pulse width modulation signal according to a brightness calibration value set and frame picture brightness data; The brightness calibration value set includes a plurality of brightness combination pairs, each of which corresponds to a current combination pair, and each brightness combination pair includes a plurality of brightness data corresponding to when the plurality of light sources emit light according to respective driving currents in the corresponding current combination pair.

4. The method according to claim 1, characterized in that: The white balance calibration current set includes respective white balance calibration current sets for different color temperature modes; The step of determining a target current combination pair including the target driving current in the white balance calibration current set comprises: Get the target color temperature mode of the current projector; Acquire a white balance calibration current set corresponding to the target color temperature mode as a target set; A target current combination pair including the target drive current is determined in the target set.

5. The method according to claim 2, characterized in that: The brightness calibration value set includes respective brightness calibration current sets for different color temperature modes. The dynamic pure black pulse width modulation signal is determined according to the brightness calibration value set and the frame picture brightness data, including: Get the target color temperature mode of the current projector; Acquire a brightness calibration value set corresponding to the target color temperature mode as a target brightness calibration value set; A dynamic pure black pulse width modulation signal is determined according to the target brightness calibration value set and the frame picture brightness data.

6. The method according to claim 3, characterized in that The projector further includes a digital microlens device; before controlling the target light source to emit light according to the target driving current and controlling the other light sources to emit light according to the driving currents of the other light sources in the target current combination pair to project the frame picture, the method further includes: Determining a jitter ratio corresponding to the digital microlens device according to the frame picture brightness data and the brightness calibration value set; The step of controlling the target light source to emit light according to the target driving current, and controlling the other light sources to emit light according to the driving currents of the other light sources in the target current combination pair, so as to project the frame picture, includes: The digital microlens device is controlled to operate according to the jitter ratio, the target light source is controlled to emit light according to the target driving current, and the other light sources in the target current combination are controlled to emit light according to the driving current of the other light sources to project the frame image.

7. The method according to claim 1, characterized in that The target light source is a green light source.

8. A projection control device, characterized in that: A projector for a plurality of light sources having different light colors; the device comprising: A first determination module is used to determine a dynamic pure black pulse width modulation signal corresponding to a frame image to be projected; A second determination module, configured to determine a target driving current corresponding to a target light source among the multiple light sources according to the dynamic pure black pulse width modulation signal; a third determining module, configured to determine a target current combination pair including the target driving current in a white balance calibration current set, wherein each current combination pair in the white balance calibration current set includes a driving current corresponding to the target light source and driving currents corresponding to other light sources; the other light sources refer to light sources other than the target light source among the multiple light sources; A control module is used to control the target light source to emit light according to the target driving current, and to control the other light sources to emit light according to the driving current of the other light sources in the target current combination pair, so as to project the frame image.

9. 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 1-7.

10. 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 7 is executed.

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