Laser projection device and display method of projected image

Abstract

This application discloses a laser projection device and a method for displaying projected images, belonging to the field of electronic technology. During the process of the projection screen rising to a height greater than a first height threshold and less than or equal to a second height threshold, the laser projection device determines a first sub-region and a second sub-region from the current display area of ​​the projection screen. A reference image is displayed in the first sub-region, and a first viewing image is displayed in the second sub-region. Since the second and first sub-regions are arranged along the rising direction of the projection screen, and the color of the reference image is more similar to the color of the lifting rod than a similarity threshold, or the grayscale value of the pixels in the reference image is less than a grayscale value threshold, this ensures that the rising of the projection screen and the display of the image remain synchronized.

Description

Technical Field

[0001] This disclosure relates to the field of electronic technology, and in particular to a laser projection device and a method for displaying projected images. Background Technology

[0002] The projection screen and main unit in a projection device can be integrated into one unit. The main unit can respond to a power-on command, drive the projection screen to rise, and display the projected image on the projection screen during the rising process. Summary of the Invention

[0003] This disclosure provides a laser projection device and a method for displaying projected images, which can solve the problem of poor display effect of projected images in related technologies. The technical solution is as follows:

[0004] On one hand, a method for displaying projected images is provided, applied to a laser projection device. The laser projection device includes: a housing, a projection screen, and a lifting assembly. A lifting rod in the lifting assembly is connected to one end of the projection screen, and a receiving groove for accommodating the projection screen is provided on one side of the housing. The method includes:

[0005] In response to a power-on command, the lifting assembly controls one end of the projection screen to rise from the receiving slot.

[0006] During the process of the projection screen rising to a height greater than a first height threshold and less than or equal to a second height threshold, a first sub-region and a second sub-region are determined from the current display area of ​​the projection screen.

[0007] A reference image is displayed in the first sub-region, and a first viewing image is displayed in the second sub-region;

[0008] The second sub-region and the first sub-region are arranged along the upward direction of the projection screen. The color of the reference image is more similar to the color of the lifting rod than a similarity threshold, or the grayscale value of the pixels in the reference image is less than a grayscale value threshold.

[0009] On the other hand, a laser projection device is provided, comprising: a housing, a projection screen, and a lifting assembly, wherein a lifting rod in the lifting assembly is connected to one end of the projection screen, and a receiving groove for accommodating the projection screen is provided on one side of the housing; the laser projection device is used for:

[0010] In response to a power-on command, the lifting assembly controls one end of the projection screen to rise from the receiving slot.

[0011] During the process of the projection screen rising to a height greater than a first height threshold and less than or equal to a second height threshold, a first sub-region and a second sub-region are determined from the current display area of ​​the projection screen.

[0012] A reference image is displayed in the first sub-region, and a first viewing image is displayed in the second sub-region;

[0013] The second sub-region and the first sub-region are arranged along the upward direction of the projection screen. The color of the reference image is more similar to the color of the lifting rod than a similarity threshold, or the grayscale value of the pixels in the reference image is less than a grayscale value threshold.

[0014] In another aspect, a laser projection device is provided, comprising: a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the method for displaying the projected image as described above.

[0015] In another aspect, a computer-readable storage medium is provided, wherein instructions are stored therein, which are loaded and executed by a processor to implement the method for displaying a projected image as described above.

[0016] In another aspect, a computer program product containing instructions is provided, which, when run on the computer, causes the computer to perform the method for displaying the projected image described above.

[0017] The beneficial effects of the technical solutions provided in this disclosure include at least the following:

[0018] This disclosure provides a laser projection device and a method for displaying projected images. During the process of the projection screen rising to a height greater than a first height threshold and less than or equal to a second height threshold, the laser projection device determines a first sub-region and a second sub-region from the current display area of ​​the projection screen. A reference image is displayed in the first sub-region, and a first viewing image is displayed in the second sub-region. Since the second and first sub-regions are arranged along the rising direction of the projection screen, and the color of the reference image is more similar to the color of the lifting rod than a similarity threshold, or the grayscale value of the pixels in the reference image is less than a grayscale value threshold, it can be ensured that the rise of the projection screen is synchronized with the display of the image, thus ensuring a good viewing experience for the user. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a laser projection device provided in an embodiment of this disclosure;

[0021] Figure 2 This is a schematic diagram of another laser projection device provided in an embodiment of this disclosure;

[0022] Figure 3 This is a schematic diagram of the structure of another laser projection device provided in the embodiments of this disclosure;

[0023] Figure 4 This is a schematic diagram of the structure of another laser projection device provided in the embodiments of this disclosure;

[0024] Figure 5 This is a flowchart of a method for displaying a projected image provided in an embodiment of this disclosure;

[0025] Figure 6 This is a flowchart of a method for displaying a projected image provided in an embodiment of this disclosure;

[0026] Figure 7 This is a schematic diagram of the current display area of ​​a projection screen provided in an embodiment of this disclosure;

[0027] Figure 8 This is a schematic diagram of the current display area of ​​another projection screen provided in this embodiment of the present disclosure;

[0028] Figure 9 This is a schematic diagram of the current display area of ​​another projection screen provided in this embodiment of the present disclosure;

[0029] Figure 10 This is a schematic diagram of an image displayed on a projection screen according to an embodiment of this disclosure. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0031] Figure 1 This is a schematic diagram of the structure of a laser projection device provided in an embodiment of this disclosure. Figure 2 This is a schematic diagram of another laser projection device provided in an embodiment of this disclosure. Figure 3This is a schematic diagram of the structure of another laser projection device provided in this disclosure embodiment. For example... Figure 1 , Figure 2 and Figure 3 As shown, the laser projection device may include a housing 10, a projection screen 20, a lifting assembly 30, a control assembly 40, and a display assembly 50.

[0032] refer to Figure 1 The housing 10 has a receiving groove 001 on one side for accommodating the projection screen 20, which is a rollable screen.

[0033] The lifting assembly 30 may include a lifting rod 31, which is connected to one end of the projection screen 20. One end of the projection screen 20 is the top of the projection screen 20.

[0034] refer to Figure 3 The control component 40 is connected to the lifting component 30 and the display component 50 respectively. The control component 40 is used to control the lifting component 30 to push one end of the projection screen 20 out of the receiving slot 001 in response to the power-on command, until the projection screen 20 rises to the top position.

[0035] The lifting assembly 30 may also include a motor 32 and a lifting rod drive assembly 33. The motor 32 is connected to the control assembly 40 and the lifting rod drive assembly 33 respectively, and the lifting rod drive assembly 33 is also connected to the lifting rod 31.

[0036] The control component 40 is used to provide drive current to the motor 32 in response to a power-on command. The motor 32 is used to drive the lifting rod drive component 33 to push the lifting rod 31 upward under the drive current, so that the lifting rod 31 drives the projection screen 20 upward until the projection screen 20 rises to the top position.

[0037] refer to Figure 4 The lifting rod drive assembly 33 may include a slider driver ( Figure 4 (Not shown), guide rail 331, first slider 332, second slider 333, first fixing block 334 and second fixing block 335. The lifting rod 31 may include a first connecting rod 311, a second connecting rod 312 and a crossbar 313.

[0038] The first fixing block 334 and the second fixing block 335 are respectively fixed on both sides of the guide rail 331, and the first slider 332 and the second slider 333 are both slidably connected to the guide rail 331. One end of the first connecting rod 311 is connected to one end of the crossbar 312, and the other end of the first connecting rod 311 is connected to the first fixing block 334 and the first slider 332 respectively. One end of the second connecting rod 312 is connected to one end of the crossbar 313, and the other end of the second connecting rod 312 is connected to the second fixing block 335 and the second slider 333 respectively. The other end of the crossbar 313 is connected to one end (i.e., the top) of the projection screen 20.

[0039] Optionally, the slider driver is connected to the motor 32, the first slider 332, and the second slider, respectively. The slider driver, driven by the motor 32, drives the first slider 332 to slide towards the first fixed block 334, and drives the second slider 333 to move towards the second fixed block 335. During the sliding of the first slider 332, it pushes the first connecting rod 311 upward, thereby causing the first connecting rod 311 to push one end of the projection screen 20 upward. During the sliding of the second slider 333, it pushes the second connecting rod 312 upward, thereby causing the second connecting rod 312 to push one end of the projection screen 20 upward.

[0040] When the laser projection equipment is powered off, the projection screen 20 retracts into the receiving slot 001, and both the first connecting rod 311 and the second connecting rod 312 are in the retracted state. (Reference) Figure 4 After the projection screen 20 is raised to the top position, both the first connecting rod 311 and the second connecting rod 312 are in the unfolded state.

[0041] The control component 40 is also used to periodically determine the rising height of the projection screen 20 during the process of controlling the lifting component 30 to push one end of the projection screen 20 out of the receiving slot 001, and to send the determined rising height to the display component 50.

[0042] The display component 40 determines the number of pixel rows in the current display area of ​​the projection screen 20 based on the rising height, and displays an image on the projection screen 20 according to the number of pixel rows in the current display area. Furthermore, the number of pixel rows in the display area is positively correlated with the rising height, so the image displayed on the projection screen 20 changes with the rising height.

[0043] Figure 5 This is a flowchart of a method for displaying a projected image according to an embodiment of this disclosure. The method is applied to the above-mentioned... Figures 1 to 4 In the laser projection device shown. For example... Figure 5 As shown, the method includes:

[0044] Step 501: In response to the power-on command, control one end of the projection screen to rise from the receiving slot via the lifting component.

[0045] The laser projection device can respond to a power-on command by raising one end of the projection screen from its receiving slot via a lifting assembly. This power-on command can be a click of the power button on the laser projection device.

[0046] Understandably, when the laser projection device is powered off, the projection screen retracts into its receiving slot, with one end of the screen at its initial position. The laser projection device can respond to a power-on command by using a lifting mechanism to control one end of the projection screen to rise from that initial position.

[0047] Step 502: During the process where the rising height of the projection screen is greater than the first height threshold and less than or equal to the second height threshold, determine the first sub-region and the second sub-region from the current display area of ​​the projection screen.

[0048] During the process of controlling one end of the projection screen to rise from the receiving slot through the lifting component, the laser projection device can periodically or in real time determine the rising height of the projection screen, and determine the first sub-region and the second sub-region from the current display area of ​​the projection screen when the rising height of the projection screen is greater than the first height threshold and less than or equal to the second height threshold.

[0049] The second sub-region and the first sub-region are arranged along the upward direction of the projection screen, that is, the first sub-region is farther away from the receiving slot relative to the second sub-region.

[0050] The rise height refers to the current rise height of the projection screen, that is, the rise height of the projection screen at the current moment. Furthermore, this rise height refers to the height between the initial position of the projection screen and one end of the projection screen. During the process where the rise height of the projection screen is greater than a first height threshold and less than or equal to a second height threshold, this rise height is relatively small.

[0051] Optionally, the laser projection device can determine the rising height of the projection screen and the number of pixel rows in the current display area of ​​the projection screen based on the current number of rotations of the motor. The current number of rotations of the motor refers to the number of rotations the motor has made since the laser projection device began controlling the motor to rotate in response to the power-on command.

[0052] Step 503: Display the reference image in the first sub-region and the first viewing image in the second sub-region.

[0053] After determining a first sub-region and a second sub-region from the current display area of ​​the projection screen, the laser projection device can display a reference image in the first sub-region and a first viewing image in the second sub-region.

[0054] Specifically, the color of the reference image is more similar to the color of the lifting rod than the similarity threshold, meaning that the color of the reference image is similar to the color of the lifting rod.

[0055] Here, "the similarity between the color of the reference image and the color of the lifting rod is greater than the similarity threshold" means that the similarity between the color of the reference image and the color of the top area is greater than the similarity threshold. The top area of ​​the lifting rod can refer to the area where the crossbar of the lifting rod is located.

[0056] Understandably, the first connecting rod, the second connecting rod, and the crossbar of the lifting rod can be the same color or similar in color.

[0057] Alternatively, the grayscale values ​​of the pixels in the reference image are less than a grayscale threshold; that is, the reference image can also be called a low-grayscale image. Optionally, the reference image can be a grayscale image or a black image, etc. When the reference image is a low-grayscale image, its color can also be similar to the color of the lifting rod.

[0058] Understandably, when the laser projection device is powered off, the projection screen retracts into its receiving slot, and both the first and second connecting rods in the lifting mechanism are in a retracted state. Upon receiving the power-on command, while the projection screen's rising height is less than or equal to a second height threshold, both the first and second connecting rods begin to unfold from their retracted state. Because the rising speeds of the first and second connecting rods are unstable at this time, the height the laser projection device determines based on the current number of motor rotations for the projection screen's rise differs from the actual height the projection screen rises.

[0059] If the current rise height determined by the laser projection device is less than the actual rise height of the projection screen, then the number of pixel rows in the current display area of ​​the projection screen determined by the laser projection device based on the current rise height will be less than the actual number of pixel rows in the actual display area of ​​the projection screen. The actual number of pixel rows in the display area is positively correlated with the actual rise height of the projection screen. If the current rise height is greater than the actual rise height, then the number of pixel rows in the current display area of ​​the projection screen determined by the laser projection device based on the current rise height will be greater than the actual number of pixel rows in the actual display area of ​​the projection screen.

[0060] In this embodiment of the present disclosure, when the rising height of the projection screen is greater than a first height threshold and less than or equal to a second height threshold, the laser projection device determines a first sub-region and a second sub-region from the current display area of ​​the projection screen, displays a reference image in the first sub-region, and displays a first viewing image in the second sub-region.

[0061] If the number of pixel rows in the current display area of ​​the projection screen, determined by the laser projection device based on the current rising height, is less than the number of pixel rows in the actual display area of ​​the projection screen, then since the image is displayed in the first and second sub-regions of the current display area, the number of pixel rows in the image displayed in the current display area is equal to the number of pixel rows in the current display area. However, the number of pixel rows in the viewing image displayed on the projection screen is much greater than the number of pixel rows in the current display area, causing the viewing image to exceed the actual display area of ​​the projection screen, and the user can clearly see that the viewing image exceeds the projection screen. The method provided in this disclosure embodiment can ensure that the reference image and the first viewing image displayed on the projection screen are within the projection screen even when the number of pixel rows in the current display area is less than the number of pixel rows in the actual display area, thereby ensuring a better image display effect.

[0062] Furthermore, since the first sub-region is farther from the receiving slot than the second sub-region, and the color of the reference image is more similar to the color of the lifting rod than a similarity threshold, or the grayscale value of the pixels in the reference image is less than a grayscale value threshold, when the color of the reference image is similar to the color of the lifting rod, even if the number of pixel rows in the current display area is less than the number of pixel rows in the actual display area, the user will not perceive that at least one row of pixels on the side of the actual display area farther from the receiving slot is not displaying an image. This ensures that the rise of the projection screen is synchronized with the display of the image and ensures the user's viewing experience.

[0063] If the number of pixel rows in the current display area of ​​the projection screen, determined by the laser projection device based on the current rising height, is greater than the number of pixel rows in the actual display area of ​​the projection screen, then since the first sub-region is far from the receiving slot relative to the second sub-region, the method provided by the embodiments of this disclosure can effectively ensure that the reference image is displayed outside the projection screen and the first viewing image is displayed inside the projection screen, that is, ensure that the image with actual content is displayed inside the projection screen.

[0064] Furthermore, because the color similarity between the reference image and the lifting rod is greater than a similarity threshold, or the grayscale value of the pixels in the reference image is less than a grayscale value threshold, the user will not perceive that the reference image is displayed outside the projection screen. In contrast, the number of pixel rows of the viewing image displayed on the projection screen is much greater than the number of pixel rows in the current display area, causing the user to clearly see the viewing image exceeding the projection screen. The method provided in this disclosure ensures that the rise of the projection screen is synchronized with the display of the image, even when the number of pixel rows in the current display area is greater than the number of pixel rows in the actual display area, and ensures that the user does not perceive the image being displayed outside the projection screen, resulting in a better viewing experience.

[0065] In summary, this disclosure provides a method for displaying a projected image. In this method, as the projection screen rises to a height greater than a first height threshold and less than or equal to a second height threshold, the laser projection device determines a first sub-region and a second sub-region from the current display area of ​​the projection screen. A reference image is displayed in the first sub-region, and a first viewing image is displayed in the second sub-region. Since the second and first sub-regions are arranged along the rising direction of the projection screen, and the color of the reference image is more similar to the color of the lifting rod than a similarity threshold, or the grayscale value of the pixels in the reference image is less than a grayscale value threshold, it is possible to ensure that the rise of the projection screen is synchronized with the display of the image, thus ensuring a good viewing experience for the user.

[0066] Figure 6 This is a flowchart of another method for displaying a projected image provided in this disclosure embodiment, which can be applied to the above-described method. Figures 1 to 4 In the laser projection device shown. For example... Figure 6 As shown, the method may include:

[0067] Step 601: In response to the power-on command, control one end of the projection screen to rise from the receiving slot via the lifting component.

[0068] The laser projection device can respond to a power-on command by raising one end of the projection screen from its receiving slot via a lifting assembly. This power-on command can be a click of the power button on the laser projection device.

[0069] Understandably, when the laser projection device is powered off, the projection screen retracts into its receiving slot, with one end of the screen at its initial position. The laser projection device can respond to a power-on command by using a lifting mechanism to control one end of the projection screen to rise from that initial position.

[0070] Step 602: While the projection screen rises to a height less than or equal to the first height threshold, display a reference image in the current display area of ​​the projection screen.

[0071] During the process of raising one end of the projection screen from the receiving slot via a lifting assembly, the laser projection device can determine the rising height of the projection screen in real time or periodically. When the rising height of the projection screen is less than or equal to a first height threshold, the laser projection device can display a reference image in the current display area of ​​the projection screen.

[0072] Specifically, the color of the reference image is more similar to the color of the lifting rod than a similarity threshold; that is, the color of the reference image is close to the color of the lifting rod. This reference image can be pre-stored in the laser projection device.

[0073] Here, "the similarity between the color of the reference image and the color of the lifting rod is greater than the similarity threshold" means that the similarity between the color of the reference image and the color of the top area is greater than the similarity threshold. The top area of ​​the lifting rod can refer to the area where the crossbar of the lifting rod is located.

[0074] Understandably, the first connecting rod, the second connecting rod, and the crossbar of the lifting rod can be the same color or similar in color.

[0075] Alternatively, the grayscale values ​​of the pixels in the reference image are less than a grayscale threshold; that is, the reference image can also be called a low-grayscale image. Optionally, the reference image can be a grayscale image or a black image, etc. When the reference image is a low-grayscale image, its color can also be similar to the color of the lifting rod.

[0076] In this embodiment, the rising height of the projection screen refers to its current rising height, that is, the rising height of the projection screen at the current moment. Furthermore, this rising height refers to the height between the initial position of the projection screen and one end of the projection screen. When the rising height of the projection screen is less than or equal to a first height threshold, the rising height is very small, and the number of pixel rows in the current display area of ​​the projection screen is very small. For example, the number of pixel rows in the current display area can be 5. By displaying only a reference image in the current display area of ​​the projection screen, the user's viewing experience can be ensured.

[0077] In one optional implementation of this disclosure, the laser projection device can determine the rising height of the projection screen based on the current number of rotations of the motor in the lifting assembly, and determine the number of pixel rows of the current display area of ​​the projection screen based on the rising height when the rising height of the projection screen is less than or equal to a first height threshold.

[0078] The current number of rotations of the motor refers to the number of rotations the motor has made since the laser projection device began controlling the motor to rotate in response to the power-on command. The rise height is positively correlated with the current number of rotations of the motor, and the number of pixel rows in the current display area is also positively correlated with the current rise height. This first height threshold can be pre-stored in the laser projection device.

[0079] For example, if the height of the projection screen is 3 centimeters and the height of the projection screen is 1 meter, then the ratio of the height of the projection screen to the height of the projection screen can be 0.03.

[0080] In another optional implementation of the present disclosure, the laser projection device can determine a first ratio of the rise height to the height of the projection screen. If the first ratio is less than or equal to a first ratio threshold, the rise height can be determined to be less than or equal to a first height threshold. The product of the first ratio and the number of pixel rows of the projection screen can be determined as the number of pixel rows of the current display area.

[0081] The height of the projection screen refers to the distance between the initial position of the projection screen and the top position of the projection screen. The height of the projection screen and the first ratio threshold can be pre-stored in the laser projection device.

[0082] Optionally, the laser projection device can determine the first ratio as a first reference ratio of the rise height to the height of the projection screen. Alternatively, it can determine the first ratio as a second reference ratio of the current number of rotations of the motor to the total number of rotations.

[0083] Understandably, if a laser projection device controls the rising height of the projection screen to match the screen's height, then the number of rotations of the motor must be controlled to match the preset total number of rotations. Since the current rising height is positively correlated with the current number of rotations of the motor, and the number of pixel rows in the current display area is also positively correlated with the current rising height, the first reference ratio and the second reference ratio are equal. Furthermore, the third reference ratio, which is the ratio of the number of pixel rows in the current display area to the number of pixel rows in the projection screen, is equal to the first reference ratio. In other words, the first, second, and third reference ratios are all equal.

[0084] The number of pixel rows in the projection screen refers to the number of pixel rows in the current display area of ​​the projection screen when the screen is raised to its current height. The laser projection device can pre-store the number of pixel rows and the preset total number of revolutions for this projection screen.

[0085] Optionally, the resolution of the projection screen can be M×N, where M is the number of pixel rows and N is the number of pixel columns. Both M and N are integers greater than 1. For example, M can be 2160 and N can be 3840.

[0086] Understandably, when the laser projection device is powered off, the projection screen retracts into its receiving slot, and both the first and second connecting rods in the lifting mechanism are in a retracted state. Upon receiving the power-on command, while the projection screen's rising height is less than or equal to a second height threshold, both the first and second connecting rods begin to unfold from their retracted state. Because the rising speeds of the first and second connecting rods are unstable at this time, the height the laser projection device determines based on the current number of motor rotations for the projection screen's rise differs from the actual height the projection screen rises.

[0087] If the current rise height determined by the laser projection device is less than the actual rise height of the projection screen, then the number of pixel rows in the current display area of ​​the projection screen determined by the laser projection device based on the current rise height will be less than the number of pixel rows in the actual display area of ​​the projection screen. The number of pixel rows in the actual display area is positively correlated with the actual rise height of the projection screen.

[0088] refer to Figure 7 The actual display area may include a current display area 002 and a blank area 003 arranged along the upward direction S of the projection screen. The blank area 003 includes at least one row of pixels, and no image is displayed in the blank area 003.

[0089] If the current rising height is greater than the actual rising height, then the number of pixel rows in the current display area of ​​the projection screen, determined by the laser projection device based on the current rising height, will be greater than the number of pixel rows in the actual display area of ​​the projection screen.

[0090] refer to Figure 8 The current display area 002 is larger than the actual display area 003 of the projection screen 20.

[0091] Step 603: During the process where the rising height of the projection screen is greater than the first height threshold and less than or equal to the second height threshold, determine the first sub-region and the second sub-region from the current display area of ​​the projection screen.

[0092] The laser projection device can determine a first sub-region and a second sub-region from the current display area of ​​the projection screen while the projection screen rises to a height greater than a first height threshold and less than or equal to a second height threshold.

[0093] refer to Figure 1 , Figure 8 and Figure 9 The second sub-region 202 and the first sub-region 201 are arranged along the upward direction S of the projection screen, that is, the first sub-region 201 is farther away from the receiving slot 001 relative to the second sub-region 202. (Reference) Figure 8 and Figure 9 The first sub-region 201 is the top region of the current display area 002 of the projection screen, and the second sub-region 202 is the bottom region of the current display area 002 of the projection screen.

[0094] Optionally, the process by which the laser projection device determines the first sub-region and the second sub-region from the current display area of ​​the projection screen may include the following steps:

[0095] S1. Determine the first ratio between the rising height and the height of the projection screen.

[0096] The laser projection device can determine a first ratio by using a first reference ratio between the current rising height and the height of the projection screen as the first ratio, while the rising height of the projection screen is greater than a first height threshold and less than or equal to a second height threshold. Alternatively, it can determine the first ratio by using a second reference ratio between the current number of rotations of the motor and the total number of rotations.

[0097] S2. Determine the first sub-region and the second sub-region based on the first ratio, the number of pixel rows of the projection screen, and the preset second ratio.

[0098] After determining the first ratio, the laser projection device can determine the first sub-region and the second sub-region based on the first ratio, the number of pixel rows of the projection screen, and the preset second ratio.

[0099] The number of pixel rows in the first sub-region is positively correlated with the first ratio, the number of pixel rows in the projection screen, and the second ratio. The number of pixel rows in the second sub-region is positively correlated with the first ratio and the number of pixel rows in the projection screen, and negatively correlated with the second ratio. The laser projection device may pre-store the preset second ratio. Optionally, the second ratio may be greater than or equal to 0.2 and less than or equal to 1.

[0100] The number of pixel rows m1 in the first sub-region can satisfy: m1=M×d×a. The number of pixel rows m2 in the second sub-region can satisfy: m2=M×d×(1-a), where M is the number of pixel rows of the projection screen, d is the first ratio, and a is the second ratio.

[0101] In one optional implementation of this disclosure, the laser projection device can determine the rising height of the projection screen based on the current number of rotations of the motor in the lifting assembly. While the rising height of the projection screen is greater than a first height threshold and less than or equal to a second height threshold, the device determines the number of pixel rows in the current display area of ​​the projection screen based on this rising height. The laser projection device can pre-store the second height threshold. The second height threshold can be the product of a preset value and the height of the projection screen, where the preset value is greater than 0 and less than 1.

[0102] In another optional implementation of this disclosure, if the laser projection device determines that the first ratio is greater than a first ratio threshold and less than or equal to a second ratio threshold, it can determine that the rising height is greater than a first height threshold and less than or equal to the second height threshold. Furthermore, the product of the first ratio and the number of pixel rows of the projection screen can be determined as the number of pixel rows in the current display area. The laser projection device may pre-store the second ratio threshold.

[0103] The second ratio threshold can be equal to a preset value. For example, the second ratio threshold can be 0.3.

[0104] Step 604: Display the reference image in the first sub-region and the first viewing image in the second sub-region.

[0105] After determining a first sub-region and a second sub-region from the current display area of ​​the projection screen, the laser projection device can display a reference image in the first sub-region and a first viewing image in the second sub-region.

[0106] The first viewing image can be a pre-stored startup screen in the laser projection device, a video signal, or a multimedia signal. The first viewing image can be a static image or a dynamic image.

[0107] In this embodiment of the present disclosure, when the rising height of the projection screen is greater than a first height threshold and less than or equal to a second height threshold, the laser projection device determines a first sub-region and a second sub-region from the current display area of ​​the projection screen, displays a reference image in the first sub-region, and displays a first viewing image in the second sub-region.

[0108] If the number of pixel rows in the current display area of ​​the projection screen, determined by the laser projection device based on the current rising height, is less than the number of pixel rows in the actual display area of ​​the projection screen, then since the image is displayed in the first and second sub-regions of the current display area, the number of pixel rows in the image displayed in the current display area is equal to the number of pixel rows in the current display area. However, the number of pixel rows in the viewing image displayed on the projection screen is much greater than the number of pixel rows in the current display area, causing the viewing image to exceed the actual display area of ​​the projection screen, and the user can clearly see that the viewing image exceeds the projection screen. The method provided in this disclosure embodiment can ensure that the reference image and the first viewing image displayed on the projection screen are within the projection screen even when the number of pixel rows in the current display area is less than the number of pixel rows in the actual display area, thereby ensuring a better image display effect.

[0109] Furthermore, since the first sub-region is farther from the receiving slot than the second sub-region, and the color of the reference image is more similar to the color of the lifting rod than a similarity threshold, or the grayscale value of the pixels in the reference image is less than a grayscale value threshold, when the color of the reference image is similar to the color of the lifting rod, even if the number of pixel rows in the current display area is less than the number of pixel rows in the actual display area, the user will not perceive that at least one row of pixels on the side of the actual display area farther from the receiving slot is not displaying an image. This ensures that the rise of the projection screen is synchronized with the display of the image and ensures the user's viewing experience.

[0110] If the number of pixel rows in the current display area of ​​the projection screen, determined by the laser projection device based on the current rising height, is greater than the number of pixel rows in the actual display area of ​​the projection screen, then the first sub-region is farther away from the receiving slot relative to the second sub-region. The method provided in this embodiment effectively ensures that the reference image is displayed outside the projection screen, while the first viewing image is displayed inside the projection screen, that is, it ensures that the image displaying actual content is displayed inside the projection screen.

[0111] Furthermore, because the color similarity between the reference image and the lifting rod is greater than a similarity threshold, or the grayscale value of the pixels in the reference image is less than a grayscale value threshold, the user will not perceive that the reference image is displayed outside the projection screen. In contrast, the number of pixel rows of the viewing image displayed on the projection screen is much greater than the number of pixel rows in the current display area, causing the user to clearly see the viewing image exceeding the projection screen. The method provided in this disclosure ensures that the rise of the projection screen is synchronized with the display of the image, even when the number of pixel rows in the current display area is greater than the number of pixel rows in the actual display area, and ensures that the user does not perceive the image being displayed outside the projection screen, resulting in a better viewing experience.

[0112] Optionally, the color of the reference image is the same as the background color of the first viewing image, which ensures a natural color transition at the junction of the reference image and the first viewing image, thereby ensuring a better image display effect.

[0113] Furthermore, the second sub-area may include a pattern display area, for example, which may display the logo of the laser projection device, or startup text, etc.

[0114] refer to Figure 10 The reference image is the same color as the background color of the first viewing image, which can be black, and can display the logo of the laser projection device.

[0115] Step 605: While the projection screen rises to a height greater than the second height threshold, display the second viewing image in the current display area of ​​the projection screen.

[0116] The laser projection device can display a second viewing image in the current display area of ​​the projection screen while the screen rises to a height greater than a second height threshold. This second viewing image may be the same as or different from the first viewing image. The second viewing image can be a video signal or a multimedia signal.

[0117] Understandably, during the process where the projection screen rises to a height greater than the second height threshold, the rising speeds of the first and second connecting rods have stabilized. At this point, the height the projection screen rises, determined by the laser projection device based on the current number of rotations of the motor, is the same as the actual height the projection screen rises. Therefore, the number of pixel rows in the current display area of ​​the projection screen, determined by the laser projection device based on the current rising height, is equal to the actual number of pixel rows in the display area of ​​the projection screen. Thus, the laser projection device can directly display the second viewing image in the current display area.

[0118] In one optional implementation of this disclosure, the laser projection device can determine the rising height of the projection screen based on the current number of rotations of the motor in the lifting assembly, and determine the number of pixel rows of the current display area of ​​the projection screen based on the rising height when the rising height of the projection screen is greater than a second height threshold.

[0119] In another optional implementation of the present disclosure, if the laser projection device determines that the first ratio is greater than the second ratio threshold, it can determine that the rising height is greater than the second height threshold, and the product of the first ratio and the number of pixel rows of the projection screen can be determined as the number of pixel rows of the current display area.

[0120] In summary, this disclosure provides a method for displaying a projected image. In this method, as the projection screen rises to a height greater than a first height threshold and less than or equal to a second height threshold, the laser projection device determines a first sub-region and a second sub-region from the current display area of ​​the projection screen. A reference image is displayed in the first sub-region, and a first viewing image is displayed in the second sub-region. Since the second and first sub-regions are arranged along the rising direction of the projection screen, and the color of the reference image is more similar to the color of the lifting rod than a similarity threshold, or the grayscale value of the pixels in the reference image is less than a grayscale value threshold, it is possible to ensure that the rise of the projection screen is synchronized with the display of the image, thus ensuring a good viewing experience for the user.

[0121] This disclosure provides a laser projection device, with reference to... Figures 1 to 4 The laser projection equipment includes: a housing, a projection screen, and a lifting assembly. A lifting rod in the lifting assembly is connected to one end of the projection screen, and a receiving slot for accommodating the projection screen is provided on one side of the housing. The laser projection equipment is used for:

[0122] In response to the power-on command, the lifting assembly controls one end of the projection screen to rise from the receiving slot.

[0123] During the process of the projection screen rising to a height greater than a first height threshold and less than or equal to a second height threshold, a first sub-region and a second sub-region are determined from the current display area of ​​the projection screen.

[0124] The reference image is displayed in the first sub-region, and the first viewing image is displayed in the second sub-region.

[0125] The second sub-region and the first sub-region are arranged along the upward direction of the projection screen. The color of the reference image is more similar to the color of the lifting rod than the similarity threshold, or the grayscale value of the pixel in the reference image is less than the grayscale value threshold.

[0126] In summary, this disclosure provides a laser projection device. During the process of the projection screen rising to a height greater than a first height threshold and less than or equal to a second height threshold, the laser projection device determines a first sub-region and a second sub-region from the current display area of ​​the projection screen. A reference image is displayed in the first sub-region, and a first viewing image is displayed in the second sub-region. Since the second and first sub-regions are arranged along the rising direction of the projection screen, and the color of the reference image is more similar to the color of the lifting rod than a similarity threshold, or the grayscale value of the pixels in the reference image is less than a grayscale value threshold, it is possible to ensure that the rise of the projection screen is synchronized with the display of the image, thus ensuring a good viewing experience for the user.

[0127] Optionally, laser projection equipment is used for:

[0128] Determine the first ratio between the height of the rise and the height of the projection screen.

[0129] The first sub-region and the second sub-region are determined based on the first ratio, the number of pixel rows on the projection screen, and the preset second ratio.

[0130] Among them, the number of pixel rows in the first sub-region is positively correlated with the first ratio, the number of pixel rows in the projection screen, and the second ratio. The number of pixel rows in the second sub-region is positively correlated with the first ratio and the number of pixel rows in the projection screen, and negatively correlated with the second ratio.

[0131] Optionally, the number of pixel rows m1 in the first sub-region satisfies: m1=M×d×a;

[0132] The number of pixel rows m2 in the second sub-region satisfies: m2=M×d×(1-a);

[0133] Where M is the number of pixel rows of the projection screen, d is the first ratio, and a is the second ratio.

[0134] Optionally, the second ratio is greater than or equal to 0.2 and less than or equal to 1.

[0135] Optionally, the reference image may be the same color as the background color of the first viewed image.

[0136] Optionally, laser projection equipment is also used for:

[0137] While the projection screen rises to a height less than or equal to a first height threshold, a reference image is displayed in the current display area of ​​the projection screen.

[0138] As the projection screen rises to a height greater than the second height threshold, a second viewing image is displayed in the current display area of ​​the projection screen.

[0139] In summary, this disclosure provides a laser projection device. During the process of the projection screen rising to a height greater than a first height threshold and less than or equal to a second height threshold, the laser projection device determines a first sub-region and a second sub-region from the current display area of ​​the projection screen. A reference image is displayed in the first sub-region, and a first viewing image is displayed in the second sub-region. Since the second and first sub-regions are arranged along the rising direction of the projection screen, and the color of the reference image is more similar to the color of the lifting rod than a similarity threshold, or the grayscale value of the pixels in the reference image is less than a grayscale value threshold, it is possible to ensure that the rise of the projection screen is synchronized with the display of the image, thus ensuring a good viewing experience for the user.

[0140] This disclosure provides a laser projection device, including: a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement a method for displaying projected images as described above.

[0141] This disclosure provides a computer-readable storage medium storing instructions that are loaded and executed by a processor to implement a method for displaying a projected image as described above.

[0142] This disclosure provides a computer program product containing instructions that, when run on a computer, cause the computer to perform the method for displaying projected images as described above.

[0143] In the embodiments of this disclosure, the terms "first," "second," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the embodiments of this disclosure, the term "multiple" means two or more. In the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone.

[0144] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A display method of projecting an image, characterized by, The application is applied to a laser projection device, which comprises a shell, a projection screen and a lifting assembly, a lifting rod in the lifting assembly is connected with one end of the projection screen, and one side of the shell is provided with a containing groove for containing the projection screen; the method comprises: in response to a start-up instruction, controlling one end of the projection screen to rise from the containing groove through the lifting assembly; during the rising height of the projection screen being greater than a first height threshold and less than or equal to a second height threshold, determining a first sub-region and a second sub-region from a current display region of the projection screen; displaying a reference image in the first sub-region and displaying a first viewing image in the second sub-region; wherein the second sub-region and the first sub-region are arranged along the rising direction of the projection screen, the color similarity of the reference image and the color of the lifting rod is greater than a similarity threshold, or the gray scale value of the pixels in the reference image is less than a gray scale value threshold.

2. The method of claim 1, wherein, the determination of the first sub-region and the second sub-region from the current display region of the projection screen comprises: determining a first ratio of the rising height to the height of the projection screen; determining the first sub-region and the second sub-region according to the first ratio, the pixel row number of the projection screen and a preset second ratio; wherein the pixel row number of the first sub-region is positively correlated with the first ratio, the pixel row number of the projection screen and the second ratio, the pixel row number of the second sub-region is positively correlated with the first ratio and the pixel row number of the projection screen, and negatively correlated with the second ratio.

3. The method of claim 2, wherein, the pixel row number m1 of the first sub-region satisfies: m1=M×d×a; the pixel row number m2 of the second sub-region satisfies: m2=M×d×(1-a); wherein M is the pixel row number of the projection screen, d is the first ratio, and a is the second ratio.

4. The method of claim 2, wherein, the second ratio is greater than or equal to 0.2 and less than or equal to 1.

5. The method according to any one of claims 1 to 4, characterized in that, the color of the reference image is the same as the background color of the first viewing image.

6. The method according to any one of claims 1 to 4, characterized in that, the method further comprises: during the rising height of the projection screen being less than or equal to the first height threshold, displaying the reference image in the current display region of the projection screen; during the rising height of the projection screen being greater than the second height threshold, displaying a second viewing image in the current display region of the projection screen.

7. A laser projection device, comprising: the laser projection device comprises a shell, a projection screen and a lifting assembly, a lifting rod in the lifting assembly is connected with one end of the projection screen, and one side of the shell is provided with a containing groove for containing the projection screen; the laser projection device is used for: in response to a start-up instruction, controlling one end of the projection screen to rise from the containing groove through the lifting assembly; during the rising height of the projection screen being greater than a first height threshold and less than or equal to a second height threshold, determining a first sub-region and a second sub-region from a current display region of the projection screen; displaying a reference image in the first sub-region and displaying a first viewing image in the second sub-region; The second sub-region and the first sub-region are arranged along a rising direction of the projection curtain, a color similarity between the reference image and the color of the lifting rod is greater than a color similarity threshold, or a gray scale value of a pixel in the reference image is less than a gray scale value threshold.

8. The laser projection device of claim 7, wherein, The laser projection device is used for: determining a first ratio of the rising height and a height of the projection curtain; determining the first sub-region and the second sub-region according to the first ratio, a pixel row number of the projection curtain and a preset second ratio; wherein the pixel row number of the first sub-region is positively correlated with the first ratio, the pixel row number of the projection curtain and the second ratio, the pixel row number of the second sub-region is positively correlated with the first ratio and the pixel row number of the projection curtain, and negatively correlated with the second ratio.

9. The laser projection device of claim 8, wherein, The pixel row number m1 of the first sub-region satisfies: m1=M×d×a; The pixel row number m2 of the second sub-region satisfies: m2=M×d×(1-a); wherein the M is the pixel row number of the projection curtain, the d is the first ratio, and the a is the second ratio.

10. The laser projection device of claim 8, wherein, The second ratio is greater than or equal to 0.2 and less than or equal to 1.

Images