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, and the method comprises the steps: determining a target white light color coordinate value of the projector according to an environment light color coordinate value and a standard white light color coordinate value; determining target light emitting durations of a plurality of preset light sources corresponding to the target white light color coordinate value and the target projection mode from a duration table; and controlling the plurality of preset light sources to emit light without reducing the current according to the target light emitting duration of the plurality of preset light sources. In the application, the chromaticity coordinate of the emergent light of the ray machine is realized by changing the light emitting duration of the preset light source, the white balance of the projection image projected by the projector is changed under the condition of not changing the current of the preset light source, the condition of brightness loss caused by changing the current of the preset light source is avoided, and the brightness of the projector is improved. Therefore, the projection effect and the user experience are 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 computer-readable storage medium. Background Art

[0002] When users use a projector, the brightness and color provided by the projector are the main factors affecting the user's perception, and different application scenarios often result in different picture presentation effects. For example, the wall and ambient light will form diffuse reflections on the projection plane, and enter the human eye together with the diffuse reflections of the light projected by the projector, affecting the color temperature of the presented picture, causing the colors viewed by the user to be distorted, and reducing the user experience. Therefore, how to adaptively adjust the color temperature of the projector according to the current environmental conditions plays an important role in improving the user experience.

[0003] At present, a projected image can be obtained by projecting a standard color image through a projector, and RGB gain parameters can be determined according to the projected standard color image and the projected image. Then, the current of the light source of the projector can be set according to the RGB gain parameters, thereby adjusting the white balance of the projector and improving the user experience.

[0004] However, the existing method for controlling the projector usually reduces the current of some light sources in the projector to achieve the standard white balance color coordinate requirements, and the projected image is prone to brightness loss, resulting in poor projection effect and poor user experience. Summary of the invention

[0005] In view of the above problems, the present application proposes a projection control method, device, projector and computer-readable storage medium, which can improve the projection effect and user experience.

[0006] In a first aspect, an embodiment of the present application provides a projection control method for a projector including a plurality of preset light sources, the method comprising:

[0007] Determine the target white light color coordinate value of the projector according to the ambient light color coordinate value and the standard white light color coordinate value, wherein the standard white light color coordinate value refers to the white light color coordinate value corresponding to the standard image;

[0008] Obtaining a target projection mode, the target projection mode indicating a brightness level of the projector;

[0009] Determine the target light emission durations of multiple preset light sources corresponding to the target white light color coordinate values ​​and the target projection mode from the duration table;

[0010] According to the target light emission durations of the plurality of preset light sources, the plurality of preset light sources are controlled to emit light without reducing the current, so that the light emission modes of the projector are different.

[0011] In a second aspect, an embodiment of the present application provides a projection control device for a projector including a plurality of preset light sources, the device comprising:

[0012] A first determination module is used to determine a target white light color coordinate value of the projector according to an ambient light color coordinate value and a standard white light color coordinate value, where the standard white light color coordinate value refers to a white light color coordinate value corresponding to a standard image;

[0013] An acquisition module, used for acquiring a target projection mode, where the target projection mode indicates a brightness level of the projector;

[0014] A second determination module is used to determine target light emission durations of multiple preset light sources corresponding to target white light color coordinate values ​​and target projection modes from a duration table;

[0015] The control module is used to control the multiple preset light sources to emit light without reducing the current according to the target light emission duration of the multiple preset light sources, so as to make the light emission mode of the projector different.

[0016] In a third aspect, an embodiment of the present application provides a projector, including:

[0017] one or more processors;

[0018] Memory;

[0019] 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.

[0020] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a program code executable by a processor. When the program code is executed by the processor, the processor executes the method of the first aspect above.

[0021] The embodiments of the present application provide a projection control method, device, projector and computer-readable storage medium. In the present application, a target light emission duration corresponding to a target white light color coordinate value and a target projection mode is determined from a duration table. According to the target light emission durations of each of the multiple preset light sources, the multiple preset light sources are controlled to emit light without reducing the current. The color coordinates of the light emitted by the optical machine are achieved by changing the light emission durations of the preset light sources. This achieves the change of the white balance of the projected image projected by the projector without changing the current of the preset light sources, avoids the loss of brightness caused by changing the current of the preset light sources, and improves the projection effect and user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 A schematic diagram of a projection interaction system suitable for the application environment of an embodiment of the present application is shown.

[0024] Figure 2 A flowchart of a projection control method according to an embodiment of the present application is shown.

[0025] Figure 3 A flowchart of a projection control method according to another embodiment of the present application is shown.

[0026] Figure 4 A schematic diagram of the structure of a projector in an embodiment of the present application is shown.

[0027] Figure 5 A schematic diagram of a light source modulation process in a scenario in an embodiment of the present application is shown.

[0028] Figure 6 A schematic diagram of a light source modulation process in another scenario in an embodiment of the present application is shown.

[0029] Figure 7 A schematic diagram of a light source modulation process in another scenario in an embodiment of the present application is shown.

[0030] Figure 8 A schematic diagram of a light source modulation process in another scenario in an embodiment of the present application is shown.

[0031] Fig. 9 A schematic diagram of a light source modulation process in another scenario in an embodiment of the present application is shown.

[0032] Fig.10 A schematic diagram of a projection control process in an embodiment of the present application is shown.

[0033] Fig.11 A flowchart of a projection control method according to another embodiment of the present application is shown.

[0034] Fig.12 A block diagram of a projection control device according to an embodiment of the present application is shown.

[0035] Fig.13 A block diagram of a projector according to an embodiment of the present application is shown.

[0036] Fig.14A structural block diagram of a computer-readable storage medium according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0038] The essence of changing the color coordinates is actually to change the proportion of RGB components in white light. In the prior art, the proportion of RGB in white light is adjusted by RGB gain parameters, thereby affecting the final color temperature. However, when the RGB content in the white point is adjusted by adjusting the RGB gain parameters, the driving current of the light source is actually changed, thereby causing the brightness of the projected image to change.

[0039] For example, Table 1 is an example of RGB gain parameters for adjusting white balance in the related art. Based on the standard mode (the wall is normal white), the RGB gain parameters are usually fully used, and only the gain parameters of at least one channel can be reduced to compensate for the proportion of other components, thereby changing the light output color temperature of the projector. Table 1 is as follows:

[0040] Table 1

[0041] Wall color R gain G gain B gain Normal White 1023 1023 1023 Bluish 1023 1023 800 Yellowish 900 950 1023 Reddish 800 1023 1023 Green 1023 800 1023 Green 1023 900 900 Purple 900 1023 900

[0042] However, when adjusting the white balance by adjusting the RGB gain parameters of the white balance, the projected image is prone to brightness loss, resulting in poor projection effects and poor user experience.

[0043] Therefore, the inventors proposed a projection control method, device, projector and computer-readable storage medium, which determine the target light emission duration corresponding to the target white light color coordinate value and the target projection mode from a duration table, and control multiple preset light sources to emit light without reducing the current according to the target light emission duration of each of the multiple preset light sources. The color coordinates of the light emitted by the optical machine are achieved by changing the light emission duration of the preset light source, which realizes changing the white balance of the projected image projected by the projector without changing the current of the preset light source, avoiding the brightness loss caused by changing the current of the preset light source, thereby improving the projection effect and user experience.

[0044] Reference Figure 1 , Figure 1 A schematic diagram of a projection interaction system suitable for an application environment of an embodiment of the present application is shown. The projection interaction system includes a projector 101 and a camera 102 .

[0045] The projector 101 can be a projector of any type or structure. The resolution of the projector can be 1080p, 2K or 4K, etc. The projector can be placed in a fixed position. The projector can project the acquired projection original image onto the projection area 104 (the area corresponding to the dotted box). The projection area can be provided with a white projection screen, which displays the projected projection original image. The displayed projected projection original image is the projection image in this application.

[0046] The camera 102 may be a high-definition camera or a digital camera, and the camera 102 may have a zoom function. The camera 102 is used to shoot the projection image of the projection area. The image shot by the camera may at least include the projection image in the projection area. The image shot by the camera may also include other contents outside the projection area. The shooting area 103 of the camera (the area corresponding to the solid line frame) includes the projection area 104, and the shooting area 103 is larger than the projection area 104.

[0047] In some embodiments, the projector implements part or all of the camera through software or hardware functions, that is, the projector can also be used as a combination of a projector and a camera to execute the steps of the projection control method of the present application.

[0048] Reference Figure 2 , Figure 2 A flowchart of a projection control method according to an embodiment of the present application is shown. The method is used for a projector and includes:

[0049] S110 , determining a target white light color coordinate value of the projector according to the ambient light color coordinate value and the standard white light color coordinate value.

[0050] In this embodiment, the projector includes multiple preset light sources, including a first type of light source that emits a first color light, a second type of light source that emits a second color light, and a third type of light source that emits a third color light, wherein the first color light is red light, the second color light is green light, and the third color light is blue light.

[0051] In another embodiment, the plurality of preset light sources further include a fourth type of light source emitting a fourth color light, and the fourth color light is blue light different from the third color light.

[0052] Among them, the preset light source in the present application can be a laser light source, an LED light source, and a laser-excited fluorescent light source.

[0053] The standard white light color coordinate value refers to the color coordinate value corresponding to the standard white field image. The standard image is a standard white field image, and the color coordinates of the standard white field image are obtained as the standard white light color coordinate value.

[0054] The projector can be arranged in a certain space, and the projector works in the space, and the ambient light color coordinate value in the space is the ambient light color coordinate value.

[0055] Specifically, the difference between the standard white light color coordinate value and the ambient light color coordinate value can be determined as the target white light color coordinate value of the projector. Since the image projected by the projector will be superimposed with the effect of ambient light, the color coordinates of the projected image finally observed are the superposition effect of the color coordinate values ​​of the projected image projected by the projector and the color coordinates of ambient light; therefore, in order to make the color coordinates of the projected image finally observed consistent with the standard white light color coordinates, it is necessary to subtract the ambient light white light color coordinate value from the standard white light color coordinate value to offset the influence of ambient light.

[0056] As an implementation, the method for obtaining the ambient light color coordinate value includes: when the projector projects the standard image, obtaining a captured image corresponding to the standard image; and calculating the difference between the color coordinates of the captured image and the standard image as the ambient light color coordinate value.

[0057] After the projector projects the standard image onto the projection area, the projection image presented in the projection area is used as the actual projection image. The actual projection image in the projection area is photographed by a camera to obtain a captured image, wherein the brightness and color parameters of the captured image are the brightness and color parameters of the standard image superimposed with ambient light. Then, the color coordinates of the captured image can be determined based on the brightness and color parameters of the captured image, and the color coordinates of the standard image can be determined based on the brightness and color parameters of the standard image. Then, the difference between the color coordinates of the captured image and the color coordinates of the standard image is calculated as the ambient light color coordinate value.

[0058] S120: Acquire a target projection mode, where the target projection mode indicates a brightness level of the projector.

[0059] In the present application, multiple projection modes can be set, each projection mode indicates a brightness level, and a projection mode selected from the multiple projection modes is the target projection mode. The target projection mode can be selected from the multiple projection modes through a user's selection operation, or a target projection mode that takes into account both display effect and energy consumption can be selected from the multiple projection modes according to the default setting.

[0060] S130 , determining target light emission durations of a plurality of preset light sources corresponding to target white light color coordinate values ​​and target projection modes from the duration table.

[0061] In this embodiment, the duration table includes light emission durations corresponding to different projection modes and different target white light color coordinate values. A projection mode and a target white light color coordinate value are used as a data combination. A data combination corresponds to a light emission duration group. A light emission duration group includes the light emission durations of multiple preset light sources of different colors. The light emission duration of a preset light source refers to the duration of light emission of the preset light source in a frame of the picture. For example, the frame rate of the projector is 25 frames, and the display time of a frame of image is 0.04s. Then, the light emission duration of different preset lights in each light emission duration in the duration table refers to the duration of light emission of different preset lights within 0.04s.

[0062] The data combination in the duration table where the projection mode is the target projection mode and the white light color coordinate value is the target white light color coordinate value can be determined as the target data combination, and the light emission duration corresponding to the target data combination in the duration table is used as the target light emission duration. For example, if the plurality of preset light sources include a red light source, a green light source, and a blue light source, the target light emission duration includes the light emission durations of the red light source, the green light source, and the blue light source.

[0063] Exemplarily, the duration table may be shown in Table 2, which is as follows:

[0064] Table 2

[0065]

[0066]

[0067] Among them, the white field coordinates in Table 2 are the white light color coordinates. Table 2 includes 3 projection modes: Look1, Look2 and Look3, and each projection mode is determined by brightness. Table 2 includes 5 different white light color coordinate values: the white light color coordinate value of the standard scene (0.29, 0.31), the white light color coordinate value of scene A (0.30, 0.32), the white light color coordinate value of scene B (0.28, 0.30), the white light color coordinate value of scene C (0.28, 0.31) and the white light color coordinate value of scene D (0.28, 0.31). L1, L2 and L3 represent different brightnesses, respectively, in lumens lm. At this time, there are 15 corresponding light emission durations, each of which includes the light emission duration of the red light source, the green light source and the blue light source. For example, when the target white light color coordinates are determined to be (0.28, 0.30) and the target projection mode is Look2, the determined target light emission duration is (R 32 ,G 32 ,B 32 ), that is, the duration of the red light source is R 32 , the duration of the green light source is G 32 , the duration of the blue light source is B 32 .

[0068] For any projection mode in the duration table, the target white light color coordinate x value in the projection mode is positively correlated with the light emission duration of the first type of light source; for any projection mode in the duration table, the target white light color coordinate y value in the projection mode is positively correlated with the light emission duration of the second type of light source.

[0069] S140 . According to the target light emitting durations of the plurality of preset light sources, control the plurality of preset light sources to emit light without reducing the current, so that the light emitting modes of the projector are different.

[0070] The light emission mode may refer to the display effect of each color light after the light emitted by multiple preset light sources or multiple preset light sources and other optical components of the projector, such as a color wheel, is superimposed when the projector controls the multiple preset light sources to emit light according to the target light emission duration of the multiple preset light sources. For example, the multiple preset light sources include a red light source, a green light source, and a blue light source, and the light emission mode of the projector may be that red light, green light, and blue light are displayed in sequence, and the display duration of red light, green light, and blue light is the same; for example, the multiple preset light sources include a red light source, a green light source, and a blue light source, and the color wheel includes a phosphor section containing yellow phosphor and a section without phosphor that transmits / reflects excitation light.

[0071] After obtaining the target light emission durations of each of the multiple preset light sources, the chip of the projector (such as DLP) obtains the start time of the preset light source to emit light based on the target light emission durations of the multiple preset light sources and through chip analysis of the projector; the chip of the projector generates an enable signal for the preset light source based on the frequency signal input into the optical machine of the projector, the target light emission duration of the preset light source and the start time of the preset light source to emit light, and the control circuit of the projector controls the preset light source to emit light without reducing the current based on the enable signal of the preset light source, so that the light emission mode of the projector is different.

[0072] The starting time when the preset light source emits light may refer to the time when the preset light source starts to emit light within a frame of image. For example, the frame rate of the projector is 25 frames, the display time of a frame of image is 0.04s, the starting time when the red light source emits light is 0.01s, and the target light emission time of the red light source is 0.01s, then the light emission period of the red light source is 0.01s-0.02s.

[0073] In this embodiment, the target light emission duration corresponding to the target white light color coordinate value and the target projection mode is determined from the duration table, and according to the target light emission duration of each of the multiple preset light sources, the multiple preset light sources are controlled to emit light without reducing the current. The color coordinates of the light emitted by the optical machine are realized by changing the light emission duration of the preset light source, and the white balance of the projected image projected by the projector is changed without changing the current of the preset light source, thereby avoiding the loss of brightness caused by changing the current of the preset light source, thereby improving the projection effect and user experience.

[0074] Reference Figure 3 , Figure 3 A flowchart of a projection control method according to another embodiment of the present application is shown. The method is used for a projector and includes:

[0075] S210, determining the target white light color coordinate value of the projector according to the ambient light color coordinate value and the standard white light color coordinate value; obtaining the target projection mode; determining the target light emission durations of multiple preset light sources corresponding to the target white light color coordinate value and the target projection mode from the duration table.

[0076] The description of S210 refers to the description of S110 to S130 above, and will not be repeated here.

[0077] S220, determining respective enable signals of the plurality of preset light sources according to target light emission durations and synchronization signals of the plurality of preset light sources; and controlling the plurality of preset light sources to emit light without reducing current according to respective enable signals of the plurality of preset light sources.

[0078] In this embodiment, the multiple preset light sources include a first type of light source that emits a first color light, a second type of light source that emits a second color light, a third type of light source that emits a third color light, and a fourth type of light source that emits a fourth color light. The first color light may refer to red light, the second color light may refer to green light, the third color light may refer to blue light, and the fourth color light may refer to blue light different from the third color light.

[0079] After obtaining the target light emission durations of each of the multiple preset light sources, the chip of the projector (such as DLP) generates a new synchronization signal according to the frequency signal of the input image and the target light emission durations of each of the preset light sources, and determines the start time of the preset light sources to emit light based on the target light emission durations of the preset light sources and the synchronization signal. Thereafter, the chip of the projector generates an enable signal for the preset light source according to the frequency signal input into the optical machine of the projector, the target light emission duration of the preset light source, and the start time of the preset light source to emit light. The optical machine of the projector controls the preset light source to emit light without reducing the current based on the enable signal of the preset light source.

[0080] Specifically, the structure of the projector can refer to Figure 4 As shown, after the projector obtains the original projection image, the optical machine 401 of the projector generates a new synchronization signal according to the signal frequency of the original projection image and the target light emission durations of the multiple preset light sources (including the first light source 402, the second light source 403 and the third light source 404), and then the chip 405 of the projector determines the start time of the preset light sources to emit light according to the target light emission durations of the preset light sources and the new synchronization signal, and further obtains the enable signals of each preset light source, and controls each preset light source through the enable signals of each preset light source to emit light with their own target light emission durations without reducing the current, so that the light emission modes of the projector are different.

[0081] S230, determining a delay signal of a wavelength conversion device according to target light emission durations of a plurality of preset light sources and synchronization signals; and controlling the wavelength conversion device to rotate according to the delay signal of the wavelength conversion device to achieve synchronization between the wavelength conversion device and the optical modulator.

[0082] In this embodiment, the projector further includes a wavelength conversion device and a light modulator; the wavelength conversion device includes a first area and a second area; the first area is used to convert the third color light emitted by the third type of light source into a fifth color light, and the second area is used to transmit the third color light emitted by the third type of light source. The fifth color light refers to yellow light, and the wavelength conversion device can refer to a color wheel. The light modulator can refer to a spatial light modulator.

[0083] like Figure 4 As shown, the wavelength conversion device further includes a color wheel 406 and a spatial light modulator 407. After the color wheel is turned on, the blue light from the blue light source changes into yellow fluorescence after passing through the first area of ​​the color wheel 406, and the blue light from the blue light source remains unchanged after passing through the first area of ​​the color wheel 406.

[0084] After obtaining the target light emission durations of each of the multiple preset light sources, the chip of the projector (e.g., DLP) generates a new synchronization signal according to the frequency signal of the input image and the target light emission durations of each of the preset light sources, and determines the delay signal of the color wheel 406 according to the target light emission durations of each of the multiple preset light sources and the synchronization signal. According to the delay signal of the color wheel 406, the control unit of the projector controls the rotation of the color wheel 406 to achieve synchronization with the light modulator 407.

[0085] The spatial light modulator 407 can modulate the light emitted by each preset light source to obtain an output image corresponding to the projection original image, and output the image to the projection area to obtain a projection image.

[0086] Exemplarily, the third light source emitting the first blue light is B1, the first light source emitting red light is R1, the second light source emitting green light is G1, the wavelength conversion device is a color wheel S that converts the first blue light into yellow fluorescence, the fourth light source emitting the second blue (dark blue) light is B2,

[0087] For the standard scenarios in Table 2, Figure 5 As shown in the figure (the two sides of the dotted line represent the light source modulation process of the two frames of images), when the blue light B is excited, the third light source B1 emits light; when the red light R is excited, the third light source B1 and the first light source R1 emit light, where B1 excites yellow fluorescence Y at the color wheel S (equivalent to the yellow light source Y1 emitting yellow fluorescence, Figure 6-Figure 9 When green light G is excited, the third light source B1 and the second light source G1 emit light, and B1 excites yellow fluorescence Y at the color wheel S. At this time, the light emission mode is that BRG is displayed in sequence, and the display time of B (blue light emitted by the third light source B1) is the shortest, and the display time of G is the longest.

[0088] For scenario A in Table 2, it can be applied to the case where the projection surface (the wall where the projection area is located) is blue, such as Figure 6 As shown, when blue light B is excited, the third light source B1 emits light; when red light R is excited, the third light source B1 and the first light source R1 emit light, wherein B1 excites yellow fluorescence Y at the color wheel S; when yellow fluorescence Y is excited, the third light source B1, the first light source R1 and the second light source G1 emit light, wherein B1 excites yellow fluorescence Y at the color wheel S; when green light G is excited, the third light source B1 and the second light source G1 emit light, wherein B1 excites yellow fluorescence Y at the color wheel S. Since the RGBY mode is enabled, the timing of the first light source R1 and the second light source G1 is lengthened, which can increase the brightness while correcting the color. At this time, the light emission mode is BYRG displayed in sequence, and the display duration of Y is the smallest, the display duration of B (blue light emitted by the third light source B1) is longer than that of Y, the display duration of R is longer than that of B, and the display duration of G is the largest.

[0089] For scene B in Table 2, it can be applied to the case where the projection surface is yellowish, such as Figure 7As shown, when blue light B is excited, the third light source B1 and the fourth light source B2 emit light; when red light R is excited, the third light source B1 and the first light source R1 emit light, wherein B1 excites yellow fluorescence Y at the color wheel S; when green light G is excited, the third light source B1 and the second light source G1 emit light, wherein B1 excites yellow fluorescence Y at the color wheel S. Since the fourth light source B2 is supplemented, the duration of the light source B1 / R1 / G1 is not changed, so the brightness can be maintained while adjusting the white balance. In addition, B2 can also be overcompensated, and when the yellow fluorescence Y is excited, the third light source B1, the first light source R1 and the second light source G1 emit light, wherein B1 excites yellow fluorescence Y at the color wheel S, and the RGBY mode is enabled to further improve the brightness. At this time, the light emission mode is BYRG displayed in sequence, and the display duration of Y is the smallest, the display duration of B (blue light emitted by the third light source B1) is higher than the display duration of Y, the display duration of R is higher than the display duration of B, and the display duration of G is the largest.

[0090] For scene C in Table 2, it is applicable to the case where the projection surface is reddish, such as Figure 8 As shown, when blue light B is excited, the third light source B1 and the fourth light source B2 emit light; when red light R is excited, the third light source B1 and the first light source R1 emit light, wherein B1 excites yellow fluorescence Y at the color wheel S; when green light G is excited, the third light source B1 and the second light source G1 emit light, wherein B1 excites yellow fluorescence Y at the color wheel S. The difference between scene C and the standard scene is that the fourth light source B2 is used, the duration of the first light source R1 is shortened, and the duration of the second light source G1 is lengthened, thereby increasing the brightness of blue light B and green light G, and even if the brightness of red light R is reduced, the brightness of the light source will not decrease. At this time, the light emission mode is B2B1RG displayed in sequence, and the display duration of B2 (blue light emitted by the fourth light source B2) is the smallest, the display duration of B1 (blue light emitted by the third light source B1) is longer than that of B2, the display duration of R is longer than that of B1, and the display duration of G is the largest.

[0091] For scene D in Table 2, it is suitable for the case where the projection surface is green, such as Fig. 9As shown, when blue light B is excited, the third light source B1 and the fourth light source B2 emit light; when red light R is excited, the third light source B1 and the first light source R1 emit light, wherein B1 excites yellow fluorescence Y at the color wheel S; when green light G is excited, the third light source B1 and the second light source G1 emit light, wherein B1 excites yellow fluorescence Y at the color wheel S. The difference between scene D and the standard scene is that the duration of the first light source R1 is lengthened and the duration of the second light source G1 is shortened. Compared with the existing adjustment method, the scene D in the present application not only reduces the brightness of the green light G, but also increases the brightness of the red light R, minimizing the brightness change. At this time, the light emission mode is B2B1RG displayed in sequence, and the display duration of B2 (blue light emitted by the fourth light source B2) is the smallest, the display duration of B1 (blue light emitted by the third light source B1) is longer than that of B2, the display duration of R is longer than that of B1, and the display duration of G is the largest.

[0092] In addition, it should be noted that when the plurality of preset light sources include a first type of light source emitting a first color of light, a second type of light source emitting a second color of light, a third type of light source emitting a third color of light, a wavelength conversion device and an optical modulator, the enable signals of the plurality of preset light sources can be determined according to the target light emission duration and synchronization signals of the plurality of preset light sources; the plurality of preset light sources can be controlled to emit light without reducing the current according to the enable signals of the plurality of preset light sources. At the same time, the time delay signal of the wavelength conversion device can also be determined according to the target light emission duration and synchronization signals of the plurality of preset light sources; the wavelength conversion device can be controlled to rotate according to the time delay signal of the wavelength conversion device to achieve synchronization with the optical modulator.

[0093] In this embodiment, the projection control process of the projector is as follows: Fig.10 As shown, the captured image is determined by a sensor (such as a camera), and the light emission timing of each preset light source (including the target light emission duration and the start time of light emission) is determined by a controller (such as a chip of a projector), and then the synchronization signal of the optical machine of the projector is determined by the light emission timing of each preset light source, and the optical machine controls the emission of each preset light source according to the synchronization signal to realize the imaging process.

[0094] In this embodiment, the enable signals of the first, second, third and fourth light sources are determined by the target light emission duration. At the same time, the delay signals of the wavelength conversion device and the modulator are determined. The first, second, third and fourth light sources are controlled by the enable signals. The rotation of the wavelength conversion device is controlled by the delay signals and its synchronization with the light modulator is achieved, thereby improving the accuracy of the projection control of the projector and further improving the projection control effect of the projector.

[0095] Reference Fig.11 , Fig.11A flowchart of a projection control method according to another embodiment of the present application is shown. The method is used for a projector and includes:

[0096] S310 . For each projection mode, obtain light emission durations of a plurality of preset light sources in the projection mode for standard white light color coordinate values ​​and a plurality of preset white light color coordinate values.

[0097] In this embodiment, the standard white light color coordinate value may be a standard white field coordinate (0.29, 0.31), and the plurality of preset white light color coordinate values ​​may be other color coordinate values ​​different from the standard white light color coordinate value in the above Table 2. For example, as shown in Table 2, the plurality of preset white light color coordinate values ​​include four white light color coordinate values ​​different from the standard white light color coordinate value: the white light color coordinate value corresponding to scene A, the white light color coordinate value corresponding to scene B, the white light color coordinate value corresponding to scene C, and the white light color coordinate value corresponding to scene D.

[0098] For each projection mode, the projector is controlled to project a standard image. When the white light color coordinate value of the projected standard image is the standard white light color coordinate value, the light emission time of each preset light source is determined as the light emission time of multiple preset light sources under the standard white light color coordinate value in the projection mode.

[0099] S320 , determining a white light color coordinate difference between each preset white light color coordinate value and the standard white light color coordinate value as a color coordinate difference corresponding to each preset white light color coordinate value.

[0100] Other white light color coordinates may refer to any white light color coordinates that are different from the standard white light color coordinates. For example, Table 2 includes four white light color coordinates that are different from the standard white light color coordinates: the white light color coordinates corresponding to scene A, the white light color coordinates corresponding to scene B, the white light color coordinates corresponding to scene C, and the white light color coordinates corresponding to scene D.

[0101] The difference between each other preset white light color coordinate value and the standard white light color coordinate value can be determined as the color coordinate difference corresponding to the preset white light color coordinate value and other white light color coordinates. For example, the four other preset white light color coordinate values ​​in Table 2 each correspond to a color coordinate difference.

[0102] S330. For each projection mode, the light emission duration of each of the multiple preset light sources in the projection mode for the standard white light color coordinate value is adjusted according to the color coordinate difference corresponding to each preset white light color coordinate value, so as to obtain the light emission duration of the multiple preset light sources in the projection mode for each preset white light color coordinate value.

[0103] For example, in projection mode D1, the preset white light color coordinates include preset white light color coordinates F1, preset white light color coordinates F2 and preset white light color coordinates F3, and the standard white light color coordinates are F0; according to the color coordinate difference of the preset white light color coordinate F1, the light emission duration of multiple preset light sources under projection mode D1 for the standard white light color coordinate F0 is adjusted to obtain the light emission duration of multiple preset light sources under projection mode D1 for the preset white light color coordinate F1, and the preset white light color coordinates F2 and the preset white light color coordinates F3 are traversed to obtain the light emission duration of each of the multiple preset light sources under projection mode D1 for the preset white light color coordinates F1, the preset white light color coordinates F2 and the preset white light color coordinates F3.

[0104] As an implementation method, S330 may include: for each projection mode, according to preset rules and according to the color coordinate difference corresponding to each preset white light color coordinate value, adjusting the light emission time of multiple preset light sources in the projection mode for the standard white light color coordinate value, to obtain the light emission time of multiple preset light sources in the projection mode for each preset white light color coordinate value, the preset rules including that the white light color coordinate x value in the projection mode is positively correlated with the light emission time of the first type of light source, and that the white light color coordinate y value in the projection mode is positively correlated with the light emission time of the second type of light source.

[0105] However, since the display duration of a frame of image is fixed, the total RGB luminous duration is certain. For example, for RGB mode, keep one component unchanged, increase the second component, and the third component will naturally decrease. If the x of other white light color coordinates is too small and y is too large relative to the standard white coordinates "that is, the standard white light color coordinates", it is necessary to increase the R duration and reduce the G duration; if the white light color coordinates xy are both too small, reduce the B duration and increase the R and / or G duration.

[0106] The color coordinates of a single color are constant, and the brightness of a single color is proportional to the luminous time. The stimulation values ​​X and Z are calculated based on the luminous time of the single color. The stimulation values ​​X and Z of white light are the sum of the stimulation values ​​X and Z of the single colors, respectively. Since the brightness of white light is constant, the color coordinates of white light can be calculated. Therefore, when the color coordinates and brightness of white light are known, the stimulation values ​​Z and X of white light can be derived, and then the new luminous time of other white light color coordinates can be determined based on the difference between the target white light color coordinates and the standard white light color coordinates.

[0107] S340, obtaining a duration table according to multiple projection modes, the light emission duration of multiple preset light sources in each projection mode for each preset white light color coordinate value, multiple preset white light color coordinate values, a standard white light color coordinate value, and the light emission duration of multiple preset light sources in each projection mode for the standard white light color coordinate value.

[0108] After obtaining multiple projection modes, the light emission duration of multiple preset light sources in each projection mode for each preset white light color coordinate value, multiple preset white light color coordinate values, standard white light color coordinate values, and the light emission duration of multiple preset light sources in each projection mode for the standard white light color coordinate value, a duration table can be constructed according to Table 2.

[0109] As mentioned above, the preset rules include that the x value of the white light color coordinate in the projection mode is positively correlated with the light emission time of the first type of light source, and the y value of the white light color coordinate in the projection mode is positively correlated with the light emission time of the second type of light source. Therefore, for any projection mode in the duration table, the x value of the white light color coordinate in the projection mode is positively correlated with the light emission time of the first type of light source; for any projection mode in the duration table, the y value of the white light color coordinate in the projection mode is positively correlated with the light emission time of the second type of light source.

[0110] S350, determining the target white light color coordinate value of the projector according to the ambient light color coordinate value and the standard white light color coordinate value; obtaining the target projection mode; determining the target light emission durations of multiple preset light sources corresponding to the target white light color coordinate value and the target projection mode from the duration table; according to the target light emission durations of the multiple preset light sources, controlling the multiple preset light sources to emit light without reducing the current, so that the light emission mode of the projector is different.

[0111] The description of S350 refers to the description of S110 to S140 above, which will not be repeated here.

[0112] In this embodiment, for each projection mode, the light emission duration corresponding to the standard white light color coordinate is adjusted according to the color coordinate difference of each preset white light color coordinate value, and the light emission duration of each preset white light color coordinate is obtained to construct a duration table, thereby reducing the steps of manually constructing the duration table and improving the efficiency of constructing the duration table.

[0113] Reference Fig.12 , Fig.12 A block diagram of a projection control device according to an embodiment of the present application is shown, wherein the device 1200 includes:

[0114] A first determination module 1210 is used to determine a target white light color coordinate value of the projector according to an ambient light color coordinate value and a standard white light color coordinate value, where the standard white light color coordinate value refers to a white light color coordinate value corresponding to a standard image;

[0115] An acquisition module 1220 is used to acquire a target projection mode, where the target projection mode indicates a brightness level of the projector;

[0116] The second determination module 1230 is used to determine the target light emission durations of multiple preset light sources corresponding to the target white light color coordinate values ​​and the target projection mode from the duration table;

[0117] The control module 1240 is used to control the multiple preset light sources to emit light without reducing the current according to the target light emission duration of the multiple preset light sources, so as to make the light emission mode of the projector different.

[0118] Optionally, the multiple preset light sources include a first type of light source that emits a first color light, a second type of light source that emits a second color light, a third type of light source that emits a third color light, and a fourth type of light source that emits a fourth color light; the control module 1240 is also used to determine the enable signals of each of the multiple preset light sources based on the target light emission duration and synchronization signals of the multiple preset light sources; and control the multiple preset light sources to emit light without reducing the current based on the enable signals of each of the multiple preset light sources.

[0119] Optionally, the projector also includes a wavelength conversion device and a light modulator; the wavelength conversion device includes a first area and a second area; the first area is used to convert the third color light emitted by the third type of light source into a fifth color light, and the second area is used to transmit the third color light emitted by the third type of light source; the control module 1240 is also used to determine the delay signal of the wavelength conversion device according to the target light emission duration and synchronization signal of multiple preset light sources; according to the delay signal of the wavelength conversion device, the wavelength conversion device is controlled to rotate to achieve synchronization with the light modulator.

[0120] Optionally, the first determination module 1210 is further configured to obtain a captured image corresponding to the standard image when the projector projects the standard image; and calculate a difference between color coordinates of the captured image and the standard image as an ambient light color coordinate value.

[0121] Optionally, the first determination module 1210 is further configured to calculate a difference between a standard white light color coordinate value and an ambient light color coordinate value as a target white light color coordinate value.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] Reference Fig.13, Fig.13 A block diagram of a projector according to another embodiment of the present application is shown. The projector 1300 may include one or more of the following components: a processor 1310, a memory 1320, and one or more application programs, wherein the one or more application programs may be stored in the memory 1320 and configured to be executed by the one or more processors 1310, and the one or more programs are configured to execute the method described in the aforementioned method embodiment.

[0126] The processor 1310 may include one or more processing cores. The processor 1310 uses various interfaces and lines to connect the various parts of the entire projector 1300, and executes various functions of the projector 1300 and processes data by running or executing instructions, programs, code sets or instruction sets stored in the memory 1320, and calling data stored in the memory 1320. Optionally, the processor 1310 can be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), and programmable logic array (Programmable Logic Array, PLA). The processor 110 can integrate one or a combination of a central processing unit (Central Processing Unit, CPU), a graphics processing unit (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 1310, and can be implemented separately through a communication chip.

[0127] The memory 1320 may include a random access memory (RAM) or a read-only memory (ROM). The memory 1320 may be used to store instructions, programs, codes, code sets or instruction sets. The memory 1320 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 1300 during use.

[0128] Please refer to Fig.14 , Fig.14The 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.

[0129] 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.

[0130] 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 plurality of preset light sources, the method comprising: Determine the target white light color coordinate value of the projector according to the ambient light color coordinate value and the standard white light color coordinate value, wherein the standard white light color coordinate value refers to the white light color coordinate value corresponding to the standard image; Acquire a target projection mode, wherein the target projection mode indicates a brightness level of the projector; Determine the target light emission durations of multiple preset light sources corresponding to the target white light color coordinate value and the target projection mode from the duration table; According to the target light emitting durations of the plurality of preset light sources, the plurality of preset light sources are controlled to emit light without reducing the current, so that the light emitting modes of the projector are different.

2. The method according to claim 1, characterized in that The plurality of preset light sources include a first type of light source that emits a first color of light; For any one of the projection modes in the duration table, the target white light color coordinate x value in the projection mode is positively correlated with the light emission duration of the first type of light source.

3. The method according to claim 1, characterized in that The plurality of preset light sources further include a second type of light source that emits a second color light; For any one of the projection modes in the duration table, the target white light color coordinate y value in the projection mode is positively correlated with the light emission duration of the second type of light source.

4. The method according to claim 1, characterized in that: The plurality of preset light sources include a first type of light source emitting a first color light, a second type of light source emitting a second color light, a third type of light source emitting a third color light, and a fourth type of light source emitting a fourth color light; The controlling the plurality of preset light sources to emit light without reducing current according to the target light emitting durations of the plurality of preset light sources comprises: Determining respective enable signals of the plurality of preset light sources according to target light emission durations of the plurality of preset light sources and synchronization signals; According to the respective enable signals of the plurality of preset light sources, the plurality of preset light sources are controlled to emit light without reducing the current.

5. The method according to claim 4, characterized in that The projector further includes a wavelength conversion device and a light modulator; the wavelength conversion device includes a first area and a second area; the first area is used to convert the third color light emitted by the third type of light source into a fifth color light, and the second area is used to transmit the third color light emitted by the third type of light source; the method further includes: Determining a time delay signal of the wavelength conversion device according to target light emission durations of the plurality of preset light sources and synchronization signals; According to the time delay signal of the wavelength conversion device, the wavelength conversion device is controlled to rotate to achieve synchronization of the optical modulator of the wavelength conversion device.

6. The method according to claim 1, characterized in that Before determining the target white light color coordinate value of the projector according to the ambient light color coordinate value and the standard white light color coordinate value, the method further includes: When the projector projects the standard image, acquiring a captured image corresponding to the standard image; The difference between the color coordinates of the captured image and the standard image is calculated as the ambient light color coordinate value.

7. The method according to claim 1, characterized in that The step of determining the target white light color coordinate value of the projector according to the ambient light color coordinate value and the standard white light color coordinate value comprises: The difference between the standard white light color coordinate value and the ambient light color coordinate value is calculated as the target white light color coordinate value.

8. A projection control device, characterized in that: For a projector including a plurality of preset light sources, the device comprises: A first determination module is used to determine a target white light color coordinate value of the projector according to an ambient light color coordinate value and a standard white light color coordinate value, wherein the standard white light color coordinate value refers to a white light color coordinate value corresponding to a standard image; An acquisition module, used for acquiring a target projection mode, wherein the target projection mode indicates a brightness level of the projector; A second determination module is used to determine the target light emission durations of multiple preset light sources corresponding to the target white light color coordinate value and the target projection mode from the duration table; The control module is used to control the plurality of preset light sources to emit light without reducing the current according to the target light emission duration of the plurality of preset light sources, so as to make the light emission mode of the projector different.

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 a program code executable by a processor, and when the program code is executed by the processor, the processor executes the method according to any one of claims 1 to 7.

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