Laser projection image display method, apparatus, and computer storage medium

Abstract

The application discloses a laser projection image display method, device and computer storage medium, and belongs to the technical field of projection. The method obtains a first distance between a target point in a screen and a projection lens, obtains a primary color offset corresponding to the first distance from a dispersion correspondence relationship, obtains a target offset, and corrects first primary color light at the target point according to the target offset. In this way, the projection device can project a display image onto the screen according to the position of the corrected first primary color light to display an adjusted image, and the coincidence degree of the first primary color light and the fixed primary color light projected onto the screen can be improved to solve the dispersion problem.

Description

Technical Field

[0001] This application relates to the field of projection technology, and in particular to a laser projection image display method, device, and computer storage medium. Background Technology

[0002] Laser light sources, used as the light source for projection devices, offer advantages such as high brightness, vibrant colors, low energy consumption, and long lifespan, resulting in high image contrast. A projection device can include a light source assembly, a light modulation assembly, and a projection lens.

[0003] Currently, during the projection process, the light source component of the projection device emits primary color light of different colors in sequence. After being modulated by the light modulation component, the primary color light is incident on the projection lens. The projection lens can guide the received primary color light to the screen of the projection TV. The projection device includes multiple optical lenses.

[0004] However, different primary colors of light have different refractive indices in optical lenses. The primary colors of light emitted by the light source component have dispersion problems after passing through the optical lenses, resulting in poor image clarity of the projection device. Summary of the Invention

[0005] This application provides a laser projection image display method, device, and computer storage medium. The technical solution is as follows:

[0006] According to one aspect of this application, a laser projection image display method is provided, the method comprising:

[0007] Obtain the dispersion correspondence, which includes the correspondence between reference distance and primary color offset. The reference distance is used to characterize the distance between a point on the screen and the projection lens. The screen is used to display the display image projected by the projection lens. The primary color offset is the offset of the first primary color light projected to a point on the screen relative to a fixed primary color light.

[0008] Obtain a first distance between a target point on the screen and the projection lens, wherein the target point is a point on the screen;

[0009] From the dispersion correspondence, obtain the primary color offset corresponding to the first distance to obtain the target offset;

[0010] Based on the target offset, the first primary color light at the target point is corrected;

[0011] The light modulation signal is obtained based on the position of the fixed primary color light and the position of the corrected first primary color light;

[0012] The image is displayed based on the optical modulation signal.

[0013] Optionally, obtaining the first distance between the target point on the screen and the projection lens includes:

[0014] Obtain the second distance between the target point and the first point, where the first point is the position of the orthographic projection of the projection lens on the plane of the screen;

[0015] Obtain the third distance between the projection lens and the screen;

[0016] Based on the first formula, the first distance is determined, and the first formula is: Wherein, X is the first distance, Y is the second distance, and Z is the third distance.

[0017] Optionally, obtaining the dispersion correspondence includes:

[0018] The first primary color light at multiple reference points on the screen is obtained relative to the fixed primary color light, and at least two of the multiple reference points are at different distances from the projection lens.

[0019] Obtain a fourth distance between each of the reference points and the projection lens;

[0020] The multiple fourth distances are normalized to obtain multiple reference distances;

[0021] Multiple reference distance ranges are determined based on the multiple reference distances, and the reference distance ranges include the multiple reference distances;

[0022] Based on the plurality of reference distance ranges and the plurality of primary color offsets, the dispersion correspondence is determined, wherein the plurality of reference distance ranges and the plurality of primary color offsets correspond one-to-one.

[0023] Optionally, obtaining the primary color offset corresponding to the first distance from the dispersion correspondence to obtain the target offset includes:

[0024] Determine the ratio between the first distance and the maximum distance, where the maximum distance is the maximum distance between the projection lens and a point on the screen;

[0025] From the plurality of reference distance ranges, determine the reference distance range corresponding to the ratio to obtain the target reference range;

[0026] From the dispersion correspondence, the primary color offset corresponding to the target reference range is determined to obtain the target offset.

[0027] Optionally, correcting the first primary color light at the target point based on the target offset includes:

[0028] Based on the second formula, the lateral offset of the first primary color light at the target point is determined. The second formula is V = U × sinα, where U is the target offset, V is the lateral offset, and α is the angle between the first line segment and the second line segment. The first line segment is the projection of the optical axis of the projection lens onto the plane of the screen, and the second line segment is the line segment between the first point and the target point. The first point is the position of the orthographic projection of the projection lens onto the plane of the screen.

[0029] Based on the third formula, the longitudinal offset of the first primary color light at the target point is determined. The third formula is W = U × cosα, where W is the longitudinal offset.

[0030] Based on the horizontal offset and the vertical offset, and the position of the target point on the screen, the adjusted position of the first primary color light at the target point is determined, so as to correct the first primary color light at the target point.

[0031] Optionally, the screen includes multiple areas;

[0032] The step of obtaining the first distance between the target point on the screen and the projection lens includes:

[0033] Obtain the first distance between a target point in each of the regions and the projection lens;

[0034] The correction of the first primary color light at the target point includes:

[0035] For each region, the target offset of the target point in the region is used as the target offset of the region to correct the first primary color light in the region.

[0036] According to another aspect of this application, a laser projection device is provided, the laser projection device comprising:

[0037] Controller, laser source, and light valve;

[0038] The controller is used to acquire the dispersion correspondence, which includes the correspondence between the reference distance and the primary color offset. The reference distance is used to characterize the distance between a point on the screen and the projection lens. The screen is used to display the display image projected by the projection lens. The primary color offset is the offset of the first primary color light projected to a point on the screen relative to a fixed primary color light.

[0039] The controller is further configured to obtain a first distance between a target point on the screen and the projection lens, wherein the target point is a point on the screen;

[0040] The controller is further configured to obtain the primary color offset corresponding to the first distance from the dispersion correspondence, so as to obtain the target offset;

[0041] The controller is further configured to correct the first primary color light at the target point based on the target offset;

[0042] The controller is also used to acquire a light modulation signal based on the position of the fixed primary color light and the position of the corrected first primary color light;

[0043] The laser source is used to provide a laser beam to the optical valve under the control of the controller;

[0044] The light valve is used to display an image based on the light modulation signal under the control of the controller.

[0045] Optionally, the laser source includes a blue laser emitter, a green laser emitter, and a red laser emitter.

[0046] According to another aspect of this application, a laser projection device is provided, the laser projection device including a processor and a memory, the memory storing at least one instruction, at least one program, code set or instruction set, the at least one instruction, the at least one program, the code set or instruction set being loaded and executed by the processor to implement the laser projection image display method described above.

[0047] According to another aspect of this application, a computer storage medium is provided, wherein at least one instruction, at least one program, code set, or instruction set is stored therein, wherein the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by a processor to implement the laser projection image display method as described above.

[0048] According to another aspect of this application, a computer program product or computer program is provided, comprising computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the aforementioned laser projection image display method.

[0049] The beneficial effects of the technical solutions provided in this application include at least the following:

[0050] A laser projection image display method is provided. It involves obtaining a first distance between a target point on the screen and the projection lens, and then obtaining the primary color offset corresponding to this first distance from a chromatic dispersion correspondence to obtain the target offset. Based on this target offset, the primary color light at the target point is corrected. In this way, the projection device can project the image onto the screen according to the position of the corrected primary color light, thus displaying the adjusted image. This improves the overlap between the projected primary color light and the fixed primary color light, thereby mitigating chromatic dispersion. This method solves the problem of poor image clarity in related technologies, achieving an improvement in the clarity of the displayed image. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of the principle of dispersion;

[0053] Figure 2 This is a schematic diagram of color difference distribution on a screen;

[0054] Figure 3 This is a schematic diagram of the implementation environment of the laser projection image display method provided in the embodiments of this application;

[0055] Figure 4 This is a flowchart of an image correction method provided in an embodiment of this application;

[0056] Figure 5 This is a flowchart of another laser projection image display method provided in the embodiments of this application;

[0057] Figure 6 This is a flowchart illustrating how to obtain a dispersion correspondence, provided in an embodiment of this application.

[0058] Figure 7 This is a schematic diagram of a reference point provided in an embodiment of this application;

[0059] Figure 8 This is a schematic diagram of a dispersion correspondence provided in an embodiment of this application;

[0060] Figure 9 This is a schematic diagram of coordinates on a screen provided in an embodiment of this application;

[0061] Figure 10 yes Figure 9The coordinate diagram shown is a coordinate diagram viewed from the screen along the first direction;

[0062] Figure 11 This is a flowchart of a first primary color correction method provided in an embodiment of this application;

[0063] Figure 12 This is a schematic diagram of a first primary color light correction provided in an embodiment of this application;

[0064] Figure 13 This is a schematic diagram of primary color light shift provided in an embodiment of this application;

[0065] Figure 14 This is a structural block diagram of a laser projection device provided in an embodiment of this application;

[0066] Figure 15 This is a structural block diagram of a laser projection device provided in an embodiment of this application;

[0067] Figure 16 This is a structural block diagram of another laser projection device provided in the embodiments of this application.

[0068] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0069] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0070] In laser projection displays, Digital Light Processing (DLP) technology is widely used. DLP refers to the process of digitally processing image signals before projecting the processed image onto a display screen through a projection lens. Projection equipment includes a light source assembly, a light modulation assembly, and a projection lens. During projection, the light source assembly emits different primary colors of light in a sequential manner. These primary colors are modulated by the light modulation assembly and then incident on the projection lens, which guides the received primary color light to the projection screen.

[0071] like Figure 1 As shown, Figure 1This is a schematic diagram illustrating the principle of dispersion. A projection lens is used to image a light beam emitted from a light modulation component, which may include three primary colors of light. Because the projection lens includes multiple lenses, and the refractive indices of the three primary colors of light are different within the lenses, the imaging positions of the three primary colors of light incident on the same position of the lens will deviate after passing through the lens. For example, as shown... Figure 1 As shown, the light beam S1 emitted by the light source assembly includes three primary colors of light. The light beam S1 is incident on the lens 101. After passing through the lens 101, the three primary colors of light (R, G and B) emitted have a dispersion problem, which makes the transmission direction of the three primary colors of light (R, G and B) and their projection position on the screen 12 different, resulting in color deviation in the displayed image projected onto the screen by the projection lens.

[0072] like Figure 2 As shown, Figure 2 This is a schematic diagram of color difference distribution on a screen. The three primary colors of light (R, G, and B) are red (R), blue (G), and green (B), respectively. The image projected onto screen 12 by the projection device can be formed by superimposing a red image formed by red primary color light R, a blue image formed by blue primary color light G, and a green image formed by green primary color light B to display a color image on screen 12. Due to chromatic aberration caused by the projection lens, the red, green, and blue images projected onto screen 12 cannot completely overlap, resulting in poor image clarity. For example, each pixel position in the image projected onto screen 12 corresponds to an image, which can include images of the three primary colors of light. That is, one pixel position can correspond to a red image formed by red primary color light R, a blue image formed by blue primary color light G, and a green image formed by green primary color light B. The superposition of these three primary color light images at the same pixel position forms a colored pixel.

[0073] However, due to the dispersion problem of the three primary colors of light emitted after passing through the lens, the three primary colors of light emitted from the light modulation component to the same position of the projection lens will be shifted after passing through the projection lens, resulting in a positional deviation between the different primary colors of light projected at a pixel position.

[0074] Figure 3 This is a schematic diagram of a projection system provided in an embodiment of this application. The projection system may include a projection device 11, a screen 12, and a controller 13.

[0075] The projection device 11 may include a light source assembly 111, a light valve 112, and a projection lens 113. The light source assembly 111 may include a laser emitter, which can emit laser light of different colors as primary color light in a sequential manner. This primary color light can be transmitted to the light valve 112, which can be a digital micromirror device (DMD). A DMD can be considered as an optical switch composed of many micromirrors, i.e., the opening and closing of the optical switch is achieved by rotating the micromirrors. The number of mirrors is determined by the display resolution, with one small mirror corresponding to one pixel. Each micromirror has an independent support frame and deflects around a hinged oblique axis by positive or negative n degrees (n>0).

[0076] Micromirrors work by reflecting light. When the micromirror is in the "on state" (meaning it's deflected by +n degrees), the incident angle of the light ray (light source) reaches n degrees, and the reflection angle also reaches n degrees (totaling to 2n degrees). In this state, the lens can receive the maximum amount of light energy. When the micromirror is in the "off state" (meaning it's deflected by -n degrees), the lens receives the minimum amount of light energy, resulting in the lowest brightness.

[0077] The projection lens 113 can receive the light beam emitted from the light valve 112 and project the received light beam onto the screen 12 to form a display image on the screen 12, so that the viewer can see the display image by looking at the projection screen.

[0078] The controller 13 may be located in the projection device and may be electrically connected to the light valve 112 to provide a drive signal to the light valve 112. The controller 13 may control the rotation angle and duration of the micromirror in the light valve 112 via the drive signal. The controller 13 may include a processor.

[0079] Figure 4 This is a flowchart of an image correction method provided in an embodiment of this application. This method can be applied to... Figure 3 In the controller of the projection system in the illustrated implementation environment. The method may include the following steps:

[0080] Step 201: Obtain the dispersion correspondence.

[0081] The dispersion correspondence includes the correspondence between the reference distance and the primary color offset. The reference distance is used to characterize the distance between a point on the screen and the projection lens. The screen is used to display the image projected by the projection lens. The primary color offset is the offset of the first primary color light at a point on the screen relative to the fixed primary color light.

[0082] Step 202: Obtain the first distance between the target point on the screen and the projection lens.

[0083] The target point is a point on the screen.

[0084] Step 203: Obtain the primary color offset corresponding to the first distance from the dispersion correspondence to obtain the target offset.

[0085] Step 204: Based on the target offset, correct the first primary color light at the target point.

[0086] Step 205: Obtain the light modulation signal based on the position of the fixed primary color light and the position of the corrected first primary color light.

[0087] Step 206: Display the image based on the optical modulation signal.

[0088] Correcting the primary color light at the target point means adjusting the projection position of the primary color light at the target point on the screen so that the primary color light and the fixed primary color light have a high degree of overlap.

[0089] In summary, this application provides a laser projection image display method. It obtains a first distance between a target point on the screen and the projection lens, and then obtains the primary color offset corresponding to the first distance from a chromatic dispersion correspondence to obtain the target offset. Based on the target offset, the first primary color light at the target point is corrected. Thus, the projection device can project the image onto the screen according to the position of the corrected first primary color light, thereby improving the overlap between the projected first primary color light and the fixed primary color light, thus mitigating chromatic dispersion. This solves the problem of poor image clarity in related technologies, achieving the effect of improving the clarity of the displayed image.

[0090] Figure 5 This is a flowchart of another laser projection image display method provided in an embodiment of this application. This method can be applied to... Figure 3 In the controller of the projection system in the illustrated implementation environment. The method may include the following steps:

[0091] Step 301: Obtain the dispersion correspondence.

[0092] The dispersion correspondence can include the correspondence between the reference distance and the primary color offset. The reference distance can be used to characterize the distance between a point on the screen and the projection lens. The screen can be used to display the image projected by the projection lens. The primary color offset is the offset of the first primary color light at a point on the screen relative to the fixed primary color light.

[0093] The first primary color light and the fixed primary color light can be two different primary color lights from a variety of primary color lights emitted by the light source component. In the embodiments of this application, the fixed primary color light may include green primary color light G, and the first primary color light may include red primary color light R and blue primary color light B. That is, in the display image projected onto the screen, with the position where the green primary color light G is projected onto the screen as a fixed position, the positions where the red primary color light R and the blue primary color light B are projected onto the screen deviate from the aforementioned fixed position. The degree of this deviation can be measured by the primary color offset. For example, the offset of the red primary color light R relative to the green primary color light G at a certain point on the screen is 0.3 pixels.

[0094] like Figure 6 As shown, step 301 may include the following five sub-steps:

[0095] Sub-step 3011: Obtain the primary color offsets of the first primary color light at multiple reference points on the screen relative to the fixed primary color light.

[0096] In this system, at least two of the multiple reference points are at different distances from the projection lens. Because the distances between the two reference points on the screen and the projection lens are different, the light beam emitted from the projection lens and directed to the two reference points is deflected to different degrees within the lens, resulting in different primary color shifts in the displayed images projected onto the two reference points on the screen. Conversely, when the distances between the two reference points on the screen and the projection lens are the same, the light beam emitted from the projection lens and directed to the two reference points is deflected to the same degree within the lens, allowing for the same primary color shift in the displayed images projected onto different locations on the screen.

[0097] like Figure 7 As shown, Figure 7This is a schematic diagram of a reference point provided in an embodiment of this application. Multiple reference points may include a first reference point c1, a second reference point c2, a third reference point c3, a fourth reference point c4, and a fifth reference point c5. The third reference point c3 and the fourth reference point c4 are at the same distance from the projection lens 113; therefore, the offset of the first primary color light (red primary color light R and blue primary color light B) at the third reference point c3 and the fourth reference point c4 relative to the fixed primary color light (green primary color light G) is the same. The first reference point c1, the second reference point c2, and the third reference point c3 are arranged in a direction away from the projection lens 113, and the distances between the first reference point c1, the second reference point c2, and the third reference point c3 and the projection lens 113 are all different. Therefore, the offsets of the first primary color light (red primary color light R and blue primary color light B) at the first reference point c1, the second reference point c2, and the third reference point c3 relative to the fixed primary color light (green primary color light G) are also all different. The offsets of the first primary color light (red primary color light R and blue primary color light B) and the fixed primary color light (green primary color light G) at these multiple reference points can be obtained by measurement.

[0098] It should be noted that the multiple reference points in the embodiments of this application are not limited to the first reference point c1, the second reference point c2, the third reference point c3, the fourth reference point c4 and the fifth reference point c5 mentioned above. The multiple reference points may also include the sixth reference point, the seventh reference point and other reference points.

[0099] Sub-step 3012: Obtain the fourth distance between each reference point and the projection lens.

[0100] The fourth distance between the reference point and the projection lens can refer to the distance between the reference point on the screen 12 and the light outlet of the projection lens 113.

[0101] Sub-step 3013: Normalize the multiple fourth distances to obtain multiple reference distances.

[0102] Normalization is a method to simplify calculations; that is, it transforms a dimensional expression into a dimensionless expression, becoming a scalar. The reference distance can be the ratio of the fourth distance to the maximum distance between the projection lens 112 and the screen 12. For example, among the multiple fourth distances mentioned above, the distance between the fifth reference point c5 and the projection lens 113 is the maximum distance between the projection lens 112 and the screen 12, which can be 5 meters. The distance between the fourth reference point c4 and the projection lens 113 is 4 meters. The normalized reference distance of the fourth reference point c4 is 4 / 5 = 0.8. The range of the normalized reference distances is between [0, 1].

[0103] Sub-step 3014: Determine multiple reference distance ranges based on multiple reference distances, where each reference distance range includes multiple reference distances.

[0104] Among multiple reference distances, adjacent reference distances or reference distances with relatively close ratios correspond to primary color offset values ​​that are relatively close. Therefore, multiple reference distances with relatively close ratios can be set as a reference distance range. For example, a reference distance range may include reference distances between 0.5 and 0.15.

[0105] Sub-step 3015: Determine the dispersion correspondence based on multiple reference distance ranges and multiple primary color offsets.

[0106] In the dispersion correspondence, multiple reference distance ranges and multiple primary color offsets correspond one-to-one.

[0107] like Figure 8 As shown, Figure 8 This is a schematic diagram of a dispersion correspondence provided in an embodiment of this application. In this schematic diagram of the dispersion correspondence, different reference distance ranges can correspond to different primary color offsets. For example, the fixed primary color light may include green primary color light, and the first primary color light may include red primary color light and blue primary color light, by... Figure 8 It can be seen that the deviation of the red primary color light from the green primary color light shows a trend of first gradually increasing and then gradually decreasing as the reference distance increases, with the maximum primary color offset of the red primary color light relative to the green primary color light reaching 0.5 pixels; the deviation of the blue primary color light from the green primary color light also shows a trend of gradually increasing as the reference distance increases, with the maximum primary color offset of the blue primary color light relative to the green primary color light reaching 0.5 pixels.

[0108] Figure 8 The one-to-one correspondence between the multiple reference distance ranges and multiple primary color offsets shown can be illustrated in Table 1 below. The reference ranges can be divided equally between [0, 1], or flexibly divided according to the degree of change in the primary color offsets corresponding to the actual reference distance ranges. This application embodiment does not limit the division of the reference ranges. For example, when the reference distance at a certain point on the screen is between 0.55 and 0.65, the offset of the red primary color light projected to that point relative to the green primary color light is 0.4 pixels, and the offset of the blue primary color light projected to that point relative to the green primary color light is 0.2 pixels.

[0109] Table 1

[0110]

[0111]

[0112] Step 302: Obtain the second distance between the target point and the first point.

[0113] Here, the first point d1 is the position of the orthographic projection of the projection lens 113 onto the plane where the screen 12 is located. The screen 12 includes multiple regions, and the target point d3 can be a point within the screen 12.

[0114] Because laser display devices typically have high resolution, with each pixel corresponding to an image, adjusting the image at each pixel location would require a large amount of computation. Therefore, this embodiment divides the screen into multiple regions and adjusts the images at multiple points within the same region in the same direction. This reduces the computational load.

[0115] For example, such as Figure 9 As shown, Figure 9 This is a schematic diagram of coordinates on a screen provided in an embodiment of this application. The screen 12 can be 100 inches in size and can be divided into 32*62 areas. The resolution of the laser display device can be 3840*2160. Taking the upper left corner of the screen 12 as the origin (0, 0), the coordinates of the lower right corner of the screen 12 are (3840, 2160), with the horizontal axis as the x-axis and the vertical axis as the y-axis. The width step of each area can be set to 62.5 pixels, and the height step can be set to 69.5 pixels, so that the multiple areas in the screen 12 are evenly distributed.

[0116] The coordinates of the intersection point d2 of the optical axis s1 of the projection lens 113 and the screen 12 can be (1920, 1080), where, for example Figure 9 and Figure 10 As shown, Figure 10 yes Figure 9 The coordinate diagram shown is a coordinate diagram of the view from the screen along the first direction f1. The first direction f1 is a direction parallel to the upper and lower edges of the screen 12. L1 is the distance between the first point d1 and the lower edge of the screen 12. The first point d1 is the position of the orthographic projection of the projection lens 113 on the plane where the screen 12 is located. The x-coordinate of the first point d1 can be equal to that of the intersection point d2. Then the distance L2 between the first point d1 and the intersection point d2 (1920, 1080) can be 1080+L1, and the coordinates of the first point d1 can be (1920, 2160+L1).

[0117] Let the coordinates of the target point d3 be (x1, y1). Then, the difference L2 between the x-coordinates of the target point d3 and the first point d1 is 1920-x1, and the difference L3 between the y-coordinates of the target point d3 and the first point d1 is 2160+L1-y1.

[0118] The second distance Y between the target point d3 and the first point d1 can be obtained by satisfying the following formula: Y 2 =(1920-x1) 2 +(2160+L1-y1) 2 L1 can be obtained from measurements. Therefore, the second distance Y between the target point d3 and the first point d1 can be obtained from the coordinates of the target point d3.

[0119] Step 303: Obtain the third distance between the projection lens and the screen.

[0120] like Figure 10 As shown, the third distance Z can be the distance between the projection lens 113 and the screen 12 in the direction perpendicular to the plane where the screen 12 is located, which can be obtained by measurement.

[0121] Step 304: Based on the first formula, obtain the first distance between the target point on the screen and the projection lens.

[0122] like Figure 9 As shown, after obtaining the second distance Y and the third distance Z, the first distance X can be determined according to the first formula, which is:

[0123] Optionally, steps 302 to 304 can be repeated to obtain a first distance between a target point in each region and the projection lens. The target point in each region can be the center point of that region.

[0124] Step 305: Determine the ratio between the first distance and the maximum distance.

[0125] The maximum distance is the maximum distance between the projection lens and a point on the screen. The normalized value of the first distance can be obtained by calculating the ratio between the first distance and the maximum distance, ensuring that the normalized value corresponds to the reference distance.

[0126] Step 306: From multiple reference distance ranges, determine the reference distance range corresponding to the ratio to obtain the target reference range.

[0127] After obtaining the normalized value of the first distance to the target point, you can refer to... Figure 8 Based on Table 1, determine which reference distance range the ratio belongs to, so as to obtain the target reference range corresponding to the target point.

[0128] Step 307: Determine the primary color offset corresponding to the target reference range from the dispersion correspondence to obtain the target offset.

[0129] Further references are available. Figure 8According to Table 1, the primary color offset corresponding to the first distance is obtained from the dispersion correspondence to obtain the target offset. For example, if the ratio between the first distance and the maximum distance is 0.5, and the corresponding target reference range is 0.55 to 0.65, then the offset of the red primary color light projected to the target point relative to the green primary color light is 0.4 pixels, and the offset of the blue primary color light projected to the target point relative to the green primary color light is 0.2 pixels.

[0130] Step 308: Based on the target offset, correct the first primary color light at the target point.

[0131] Based on the established coordinate system and the target offset, the lateral and vertical offsets of the first primary color light relative to the fixed primary color light can be determined. After determining the lateral and vertical offsets, the position of the first primary color light can be adjusted in the opposite directions along the horizontal and vertical axes to achieve a higher degree of overlap between the adjusted primary color lights of different colors.

[0132] like Figure 11 As shown, step 308 may include the following three sub-steps:

[0133] Sub-step 3081: Based on the second formula, determine the lateral offset of the first primary color light at the target point. The second formula is V = U × sinα, where U is the target offset, V is the lateral offset, α is the angle between the first line segment and the second line segment, the first line segment is the orthographic projection of the optical axis of the projection lens onto the plane of the screen, and the second line segment is the line segment between the first point and the target point.

[0134] like Figure 7 As shown, as the angle α between the first line segment t1 and the second line segment t2 changes, the offset direction of the first primary color light relative to the fixed primary color light at different target points is different. When multiple target points are at the same distance from the first point, as the angle α between the first line segment t1 and the second line segment t2 increases, the lateral offset of the first primary color light relative to the fixed primary color light gradually increases, while the longitudinal offset gradually decreases.

[0135] For example, the first primary color light at the third reference point c3 and the fourth reference point c4 has the same offset relative to the fixed primary color light, but the offset directions of the first primary color light at the third reference point c3 and the fourth reference point c4 relative to the fixed primary color light are different. The lateral offset of the first primary color light at the third reference point c3 relative to the fixed primary color light is 0 (V = U × sin0° = 0), and the lateral offset of the first primary color light at the fourth reference point c4 relative to the fixed primary color light is approximately 0.7U (V = U × sin45° = 0.7U). The third reference point c3 and the fourth reference point c4 can be two of multiple target points.

[0136] Sub-step 3082: Based on the third formula, determine the longitudinal offset of the first primary color light at the target point. The third formula is W = U × cosα, where W is the longitudinal offset.

[0137] Similarly, the longitudinal offset of the first primary color light at the target point can be determined based on the relationship between the angle α between the first line segment t1 and the second line segment t2 and the target offset. For example, the longitudinal offset of the first primary color light at the third reference point c3 relative to the fixed primary color light is U (V = U × cos0°), and the longitudinal offset of the first primary color light at the fourth reference point c4 relative to the fixed primary color light is approximately 0.7U (V = U × cos45°). The lateral and longitudinal offsets of the first primary color light at the fourth reference point c4 relative to the fixed primary color light are equal.

[0138] Sub-step 3083: Based on the horizontal and vertical offsets and the position of the target point on the screen, determine the adjusted position of the first primary color light at the target point in order to correct the first primary color light at the target point.

[0139] Optionally, for each region of the screen, the target offset of the target point in the region can be used as the target offset of the region to correct the first primary color light in the region.

[0140] like Figure 12 As shown, Figure 12 This is a schematic diagram of a first primary color light correction provided in an embodiment of this application. The coordinates of the green primary color light at the target point can be (G x1, G y1). It can be understood that the coordinates of the green, blue, and red primary color lights projected onto the target point by the projection device are preset to be the same; that is, the original coordinates of the green, blue, and red primary color lights at the target point are all (G x1, G y1). However, due to the influence of chromatic aberration, the coordinates of the blue and red primary color lights actually projected onto the target point through the projection lens deviate to a certain extent from the original coordinates. Therefore, it is necessary to reset the coordinates of the blue and red primary color lights so that the coordinates of the blue and red primary color lights actually projected onto the target point through the projection lens are the same as those of the green primary color light, thereby improving the impact of chromatic aberration.

[0141] The blue primary color light is offset by V1 in the opposite direction along the x-axis and by W1 in the positive direction along the y-axis relative to the green primary color light. By offsetting the blue primary color light by V1 in the positive direction along the x-axis and by W1 in the negative direction along the y-axis, the blue primary color light and the green primary color light at the target point can be made to coincide.

[0142] That is, the corrected coordinates of the blue primary color light set in the controller can be (G x1+V1, Gy1-W1), so that the blue primary color light and red primary color light actually projected to the target point through the projection lens coincide with the green primary color light.

[0143] Similarly, the red primary color light is offset by V2 in the opposite direction along the x-axis and by W2 in the positive direction along the y-axis relative to the green primary color light. By offsetting the red primary color light by V2 in the positive direction along the x-axis and by W2 in the negative direction along the y-axis, the red primary color light and the green primary color light at the target point can be made to coincide.

[0144] That is, the corrected coordinates of the red primary color light set in the controller can be (G x1+V2, Gy1-W2), so that the red primary color light and the red primary color light actually projected to the target point through the projection lens coincide with the green primary color light.

[0145] It should be noted that in the embodiments of this application, W and V include both the magnitude and direction of the offset, therefore W and V are distinguished by positive and negative signs. For example, as shown... Figure 7 As shown, if the target point is located to the right of the first line segment t1 (the orthographic projection of the optical axis of the projection lens onto the plane of the screen), and the blue primary color light is offset by V1 relative to the green primary color light along the x-axis, then the blue primary color light can be adjusted to offset V1 in the positive x-axis direction. In this case, the required adjustment amount for the blue primary color light is +V1. If the target point is located to the left of the first line segment t1, and the blue primary color light is offset by V1 relative to the green primary color light along the x-axis, then the blue primary color light can be adjusted to offset V1 in the negative x-axis direction. In this case, the required adjustment amount for the blue primary color light is -V1. The position of the target point can be determined by judging its coordinates. For example, when the x-coordinate of the target point is less than 1920, the target point can be considered to be located to the left of the first line segment t1.

[0146] Step 309: Obtain the light modulation signal based on the position of the fixed primary color light and the position of the corrected first primary color light.

[0147] After determining the corrected coordinates of the first primary color light, these corrected coordinates can be image pixel signals. These image pixel signals can be converted into optical modulation signals in the controller. These optical modulation signals can be used to drive the optical valve and control the micromirrors within the optical valve. The optical modulation signals can include both the corrected image pixel signals of the first primary color light and the uncorrected image pixel signals of the fixed primary color light.

[0148] Step 310: Display the image based on the optical modulation signal.

[0149] The projection lens can receive the light beam emitted from the light valve. The first primary color light, modulated by the light valve, shines onto the projection lens at the adjusted position to improve the overlap between the first primary color light and the fixed primary color light in the image projected onto the screen.

[0150] like Figure 13 As shown, Figure 13 This is a schematic diagram of primary color light shift provided in an embodiment of this application. After correcting the first primary color light, the maximum shift of the red primary color light relative to the green primary color light, and the maximum shift of the blue primary color light relative to the green primary color light, in this embodiment of the application is only 0.2 pixels. Compared with related technologies, where the maximum shift of the red primary color light relative to the green primary color light, and the maximum shift of the blue primary color light relative to the green primary color light, is 0.5 pixels, the dispersion problem is significantly improved.

[0151] In summary, this application provides a laser projection image display method. It obtains a first distance between a target point on the screen and the projection lens, and then obtains the primary color offset corresponding to the first distance from a chromatic dispersion correspondence to obtain the target offset. Based on the target offset, the first primary color light at the target point is corrected. Thus, the projection device can project the image onto the screen according to the position of the corrected first primary color light, thereby improving the overlap between the projected first primary color light and the fixed primary color light, thus mitigating chromatic dispersion. This solves the problem of poor image clarity in related technologies, achieving the effect of improving the clarity of the displayed image.

[0152] Figure 14 This is a structural block diagram of a laser projection device provided in an embodiment of this application. The laser projection device 1300 includes: a controller 1310, a laser light source 1320, and a light valve 1330.

[0153] The controller 1310 is used to acquire the dispersion correspondence, which includes the correspondence between the reference distance and the primary color offset. The reference distance is used to characterize the distance between a point on the screen and the projection lens. The screen is used to display the image projected by the projection lens. The primary color offset is the offset of the first primary color light projected to a point on the screen relative to the fixed primary color light.

[0154] The controller 1310 is also used to obtain a first distance between a target point on the screen and the projection lens, wherein the target point is a point on the screen;

[0155] The controller 1310 is also used to obtain the primary color offset corresponding to the first distance from the dispersion correspondence to obtain the target offset;

[0156] The controller 1310 is also used to correct the first primary color light at the target point based on the target offset;

[0157] The controller 1310 is also used to acquire an optical modulation signal based on the position of the fixed primary color light and the position of the corrected first primary color light;

[0158] Laser source 1320 is used to provide a laser beam to light valve 1330 under the control of controller 1310;

[0159] The light valve 1330 is used to display images based on light modulation signals under the control of the controller 1310.

[0160] Optionally, the laser source may include a blue laser emitter, a green laser emitter, and a red laser emitter. The blue laser emitter emits a blue laser beam, the green laser emitter emits a green laser beam, and the red laser emitter emits a red laser beam.

[0161] Figure 15 This is a structural block diagram of a laser projection device provided in an embodiment of this application. The laser projection device 1400 includes:

[0162] The relationship acquisition module 1410 is used to acquire the dispersion correspondence, which includes the correspondence between the reference distance and the primary color offset. The reference distance is used to characterize the distance between a point on the screen and the projection lens. The screen is used to display the image projected by the projection lens. The primary color offset is the offset of the first primary color light projected to a point on the screen relative to the fixed primary color light.

[0163] The distance acquisition module 1420 is used to acquire the first distance between a target point on the screen and the projection lens, where the target point is a point on the screen.

[0164] The offset acquisition module 1430 is used to obtain the primary color offset corresponding to the first distance from the dispersion correspondence to obtain the target offset.

[0165] The correction module 1440 is used to correct the first primary color light at the target point based on the target offset.

[0166] The control module 1450 is used to acquire the light modulation signal based on the position of the fixed primary color light and the position of the corrected first primary color light;

[0167] Display module 1460 is used to display images based on optical modulation signals.

[0168] Optionally, such as Figure 16 As shown, Figure 16 This is a structural block diagram of another laser projection device provided in the embodiments of this application. The laser projection device 1400 may further include:

[0169] The second distance determination module 1470 is used to obtain the second distance between the target point and the first point, where the first point is the position of the orthographic projection of the projection lens on the plane of the screen.

[0170] The third distance determination module 1480 is used to obtain the third distance between the projection lens and the screen.

[0171] The first distance determination module 1490 is used to determine a first distance based on a first formula, which is: Where X is the first distance, Y is the second distance, and Z is the third distance.

[0172] Optionally, the relationship acquisition module in the laser projection device may include:

[0173] The first acquisition unit is used to acquire multiple primary color offsets of the first primary color light at multiple reference points on the screen relative to the fixed primary color light, wherein at least two of the multiple reference points are at different distances from the projection lens.

[0174] The second acquisition unit is used to acquire the fourth distance between each reference point and the projection lens.

[0175] The first determining unit is used to normalize multiple fourth distances to obtain multiple reference distances.

[0176] The second determining unit is used to determine multiple reference distance ranges based on multiple reference distances, wherein the reference distance ranges include multiple reference distances.

[0177] The third determining unit is used to determine the dispersion correspondence based on multiple reference distance ranges and multiple primary color offsets, in which multiple reference distance ranges and multiple primary color offsets correspond one-to-one.

[0178] Optionally, the offset acquisition module in the laser projection device may include:

[0179] The ratio determination unit is used to determine the ratio between the first distance and the maximum distance, where the maximum distance is the maximum distance between the projection lens and a point on the screen.

[0180] The first target determination unit is used to determine the reference distance range corresponding to the ratio from multiple reference distance ranges in order to obtain the target reference range.

[0181] The second target determination unit is used to determine the primary color offset corresponding to the target reference range from the dispersion correspondence, so as to obtain the target offset.

[0182] Optionally, the correction module in the laser projection device may include:

[0183] The lateral acquisition unit is used to determine the lateral offset of the first primary color light at the target point based on the second formula, which is V = U × sinα, where U is the target offset, V is the lateral offset, and α is the angle between the first line segment and the second line segment. The first line segment is the projection of the optical axis of the projection lens onto the plane of the screen, and the second line segment is the line segment between the first point and the target point. The first point is the position of the orthographic projection of the projection lens onto the plane of the screen.

[0184] The longitudinal acquisition unit is used to determine the longitudinal offset of the first primary color light at the target point based on the third formula, which is W=U×cosα, where W is the longitudinal offset.

[0185] The correction unit is used to determine the adjusted position of the first primary color light at the target point based on the horizontal offset, the vertical offset, and the position of the target point on the screen, so as to correct the first primary color light at the target point.

[0186] In summary, the laser projection device provided in this application obtains a first distance between a target point on the screen and the projection lens, and obtains the primary color offset corresponding to the first distance from the chromatic dispersion correspondence to obtain the target offset. Then, based on the target offset, the first primary color light at the target point is corrected. In this way, the projection device can project a display image onto the screen according to the position of the corrected first primary color light, thereby improving the overlap between the first primary color light projected onto the screen and the fixed primary color light, thus mitigating the chromatic dispersion problem. This solves the problem of poor image clarity in related technologies, achieving the effect of improving the clarity of the displayed image.

[0187] Furthermore, this application also provides a laser projection device, which includes a processor and a memory. The memory stores at least one instruction, at least one program, code set, or instruction set. The processor loads and executes the at least one instruction, at least one program, code set, or instruction set to implement any of the laser projection image display methods provided in the above embodiments.

[0188] Furthermore, this application also provides a computer storage medium storing at least one instruction, at least one program, code set, or instruction set, wherein the at least one instruction, at least one program, code set, or instruction set is loaded and executed by a processor to implement any of the laser projection image display methods provided in the above embodiments.

[0189] In this application, the terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" means two or more, unless otherwise expressly defined.

[0190] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0191] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0192] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0193] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A laser projection image display method characterized by, The method includes: Obtain the dispersion correspondence, which includes the correspondence between reference distance and primary color offset. The reference distance is used to characterize the distance between a point on the screen and the projection lens. The screen is used to display the display image projected by the projection lens. The primary color offset is the offset of the first primary color light projected to a point on the screen relative to a fixed primary color light. Obtain the second distance between the target point on the screen and the first point, wherein the target point is a point on the screen and the first point is the position of the orthographic projection of the projection lens on the plane of the screen; Obtain the third distance between the projection lens and the screen; Based on the first formula, a first distance between the target point and the projection lens is determined, the first formula being: wherein X is the first distance, Y is the second distance, and Z is the third distance. From the dispersion correspondence, obtain the primary color offset corresponding to the first distance to obtain the target offset; Based on the target offset, the first primary color light at the target point is corrected; The light modulation signal is obtained based on the position of the fixed primary color light and the position of the corrected first primary color light; The image is displayed based on the optical modulation signal.

2. The method of claim 1, wherein, The acquisition of the dispersion correspondence includes: The first primary color light at multiple reference points on the screen is obtained relative to the fixed primary color light, and at least two of the multiple reference points are at different distances from the projection lens. Obtain a fourth distance between each of the reference points and the projection lens; The multiple fourth distances are normalized to obtain multiple reference distances; Multiple reference distance ranges are determined based on the multiple reference distances, and the reference distance ranges include the multiple reference distances; Based on the plurality of reference distance ranges and the plurality of primary color offsets, the dispersion correspondence is determined, wherein the plurality of reference distance ranges and the plurality of primary color offsets correspond one-to-one.

3. The method of claim 2, wherein, The step of obtaining the primary color offset corresponding to the first distance from the dispersion correspondence to obtain the target offset includes: Determine the ratio between the first distance and the maximum distance, where the maximum distance is the maximum distance between the projection lens and a point on the screen; From the plurality of reference distance ranges, determine the reference distance range corresponding to the ratio to obtain the target reference range; From the dispersion correspondence, the primary color offset corresponding to the target reference range is determined to obtain the target offset.

4. The method of claim 1, wherein, The step of correcting the first primary color light at the target point based on the target offset includes: Based on the second formula, the lateral offset of the first primary color light at the target point is determined. The second formula is V=U×sinα, where U is the target offset, V is the lateral offset, and α is the angle between the first line segment and the second line segment. The first line segment is the projection of the optical axis of the projection lens onto the plane of the screen, and the second line segment is the line segment between the first point and the target point. The first point is the position of the orthographic projection of the projection lens onto the plane of the screen. Based on the third formula, the longitudinal offset of the first primary color light at the target point is determined. The third formula is W=U×cosα, where W is the longitudinal offset. Based on the horizontal offset and the vertical offset, and the position of the target point on the screen, the adjusted position of the first primary color light at the target point is determined, so as to correct the first primary color light at the target point.

5. The method according to claim 1, characterized in that, The screen includes multiple areas; Determining the first distance between the target point and the projection lens includes: Obtain the first distance between a target point in each of the regions and the projection lens; The correction of the first primary color light at the target point includes: For each region, the target offset of the target point in the region is used as the target offset of the region to correct the first primary color light in the region.

6. A laser projection device, characterized in that, The laser projection device includes: a controller, a laser light source, and a light valve; The controller is used to acquire the dispersion correspondence, which includes the correspondence between the reference distance and the primary color offset. The reference distance is used to characterize the distance between a point on the screen and the projection lens. The screen is used to display the display image projected by the projection lens. The primary color offset is the offset of the first primary color light projected to a point on the screen relative to a fixed primary color light. The controller is further configured to: obtain a second distance between a target point on the screen and a first point, wherein the target point is a point on the screen and the first point is the position of the orthographic projection of the projection lens onto the plane of the screen; obtain a third distance between the projection lens and the screen; and determine the first distance between the target point and the projection lens based on a first formula, wherein the first formula is: Where X is the first distance, Y is the second distance, and Z is the third distance; The controller is further configured to obtain the primary color offset corresponding to the first distance from the dispersion correspondence, so as to obtain the target offset; The controller is further configured to correct the first primary color light at the target point based on the target offset; The controller is also used to acquire a light modulation signal based on the position of the fixed primary color light and the position of the corrected first primary color light; The laser source is used to provide a laser beam to the optical valve under the control of the controller; The light valve is used to display an image based on the light modulation signal under the control of the controller.

7. The laser projection device according to claim 6, characterized in that, The laser source includes a blue laser emitter, a green laser emitter, and a red laser emitter.

8. A laser projection device, characterized in that, The laser projection device includes a processor and a memory. The memory stores at least one instruction, at least one program, a code set, or an instruction set. The at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by the processor to implement the laser projection image display method as described in any one of claims 1 to 5.

9. A computer storage medium, characterized in that, The computer storage medium stores at least one instruction, at least one program, code set, or instruction set, wherein the at least one instruction, the at least one program, the code set, or instruction set is loaded and executed by a processor to implement the laser projection image display method as described in any one of claims 1 to 5.

Images