Projection equipment

Abstract

The embodiment of the invention belongs to the projection display technology, and provides projection equipment. The projection equipment comprises a lens assembly, a controller and a plurality of temperature sensors, the lens assembly comprises a lens barrel, a plurality of lenses and a focusing lens group, the plurality of lenses comprise a lens and a curved reflector, and the plurality of lenses in the lens assembly are respectively provided with the corresponding temperature sensors. The controller obtains a first temperature value of each lens in a current sampling period and a second temperature value of each lens in a previous sampling period of the current sampling period through the sensor. And determining a target lens from the plurality of lenses according to a difference value between the first temperature value and the second temperature value, determining target moving data according to the first temperature value and the second temperature value of the target lens, and sending the target moving data to the focusing lens group. And the focusing lens group moves according to the target movement data to perform focusing. Focusing can be carried out when the temperature changes, the temperature drift phenomenon is corrected, the focusing accuracy is high, and the projected image is clearer.

Description

Technical Field

[0001] Embodiments of the present application relate to projection display technology. More specifically, it relates to a projection device. Background Art

[0002] With the development of technology, projection devices can project images or videos onto a screen or wall and have been widely used in scenarios such as homes and meeting rooms.

[0003] In the prior art, during the operation of a projection device, a large amount of heat is generated, the internal temperature of the projection device rises, the lens assembly in the projection device is affected by the high temperature, the lenses in the lens assembly are deformed, resulting in a change in the focal position of the lens assembly and an unclear projection image, and a temperature drift phenomenon occurs.

[0004] Therefore, there is an urgent need for a projection device that can perform focusing when the temperature changes to correct the temperature drift phenomenon. Summary of the Invention

[0005] Embodiments of the present application provide a projection device for solving the problem that the focal position of an existing projection device changes due to temperature changes, resulting in a temperature drift phenomenon.

[0006] In a first aspect, embodiments of the present application provide a projection device, the projection device includes:

[0007] A lens assembly, a controller, and a plurality of temperature sensors. The lens assembly includes a lens barrel, a focusing lens group and a plurality of lenses in the lens barrel. The plurality of lenses include a lens and a curved mirror;

[0008] The controller is respectively connected to the focusing lens group and the plurality of temperature sensors; at least one temperature sensor corresponding to the lens is installed outside the connection position of the lens barrel and the lens in the plurality of lenses; at least one temperature sensor corresponding to the curved mirror is installed on the curved mirror in the plurality of lenses;

[0009] The controller is configured to:

[0010] Obtain a first temperature value of the lens in the current sampling period and a second temperature value in the previous sampling period of the current sampling period through the temperature sensor corresponding to the lens;

[0011] If the absolute value of the difference between the first temperature value and the second temperature value is greater than a preset temperature difference threshold, the lens is used as the target lens;

[0012] Determine target movement data according to the first temperature value and the second temperature value of the target lens;

[0013] Send the target movement data to the focusing lens group;

[0014] The focusing lens group is configured to move according to the target movement data for focusing.

[0015] Advantages of this embodiment: By configuring corresponding temperature sensors for multiple lenses in the lens assembly, the controller obtains the first temperature value of each lens in the current sampling period and the second temperature value in the previous sampling period of the current sampling period through the sensors. Then, according to the difference between the first temperature value and the second temperature value, the target lens is determined from multiple lenses. After that, according to the first temperature value and the second temperature value of the target lens, the target movement data is determined and sent to the focusing lens group in the lens assembly. The focusing lens group moves according to the target movement data for focusing. It can achieve focusing when the temperature changes, correct the temperature drift phenomenon, and the accuracy of focusing is relatively high, and the projected image is clearer.

[0016] In some embodiments of the present application, when the controller is configured to determine the target movement data according to the first temperature value and the second temperature value of the target lens, it is specifically configured to:

[0017] Determine the initial temperature difference of the target lens according to the first temperature value and the second temperature value of the target lens;

[0018] Calculate the target movement data according to the initial temperature difference of the target lens and the preset regression equation.

[0019] Advantages of this embodiment: By calculating the initial temperature difference of each target lens and then combining the preset regression equation to calculate the target movement data, the target movement data is more accurate.

[0020] In some embodiments of the present application, when the controller is configured to calculate the target movement data according to the initial temperature difference of the target lens and the preset regression equation, it is specifically configured to:

[0021] Generate a target temperature difference according to the initial temperature difference of the target lens;

[0022] Calculate the target movement data according to the target temperature difference and the preset first regression equation.

[0023] Advantages of this embodiment: By generating a target temperature difference according to the initial temperature difference of all target lenses and then combining the first regression equation to calculate the target movement data, the accuracy of the target movement data can be improved.

[0024] In some embodiments of the present application, when the controller is configured to generate a target temperature difference according to the initial temperature difference of the target lens, it is specifically configured to:

[0025] Take the maximum value of the initial temperature difference or the average value of the initial temperature differences as the target temperature difference.

[0026] Advantageous effects of this embodiment: Taking the maximum value or the average value of all the initial temperature differences as the target temperature difference enables the target temperature difference to better represent the temperature change of the lens and makes the target temperature difference more accurate.

[0027] In some embodiments of the present application, when the controller is configured to calculate the target movement data according to the initial temperature difference of the target lens and a preset regression equation, it is specifically configured to:

[0028] Calculate the initial movement data of the target lens according to the initial temperature difference of the target lens and the preset second regression equation corresponding to the target lens;

[0029] Generate the target movement data according to the initial movement data of the target lens.

[0030] Advantageous effects of this embodiment: By calculating the initial movement data of each target lens according to the initial temperature difference of each target lens and its corresponding second regression equation, and then generating the target movement data according to the initial movement data of all the target lenses, the accuracy of the target movement data can be improved.

[0031] In some embodiments of the present application, when the controller is configured to generate the target movement data according to the initial movement data, it is specifically configured to:

[0032] Determine the maximum value of the initial movement data or the average value of the initial movement data as the target movement data.

[0033] Advantageous effects of this embodiment: Determining the maximum value or the average value of all the initial movement data as the target movement data makes the target movement data more accurate, and the focusing lens group moves according to the target movement data, resulting in more accurate focus adjustment.

[0034] In some embodiments of the present application, the preset regression equation is an equation obtained by fitting based on multiple temperature difference data and the movement data corresponding to the temperature difference data.

[0035] Advantageous effects of this embodiment: The regression equation is an equation obtained by fitting based on the temperature difference data and the movement data, enabling the playback equation to better reflect the relationship between the temperature difference and the movement data.

[0036] In some embodiments of the present application, the first temperature value is the average value of the third temperature values obtained by the temperature sensor corresponding to the lens in the current sampling period, or the maximum value of the third temperature values;

[0037] The second temperature value is the average value of the fourth temperature values obtained by the temperature sensor corresponding to the lens in the previous sampling period of the current sampling period, or the maximum value of the fourth temperature values.

[0038] Advantages of this embodiment: The first temperature value and the second temperature value are the average value or the maximum value of the temperature values obtained by at least one temperature sensor, and can accurately reflect the temperature of the lens.

[0039] In some embodiments of the present application, if the lens with a temperature sensor installed is a lens, the temperature sensor is installed outside the connection position between the light-transmitting area of the lens and the lens barrel in the lens barrel.

[0040] Advantages of this embodiment: When the lens is a lens, the temperature change in the light-transmitting area of the lens is more obvious. Therefore, the temperature sensor is installed outside the connection position between the light-transmitting area of the lens and the lens barrel in the lens barrel, so that the temperature value obtained by the temperature sensor is more accurate.

[0041] In some embodiments of the present application, if the lens with a temperature sensor installed is a curved mirror, the temperature sensor is installed on the non-reflective surface of the lens.

[0042] Advantages of this embodiment: When the lens is a curved mirror, the temperature sensor is installed on the non-reflective surface of the lens, which will not affect imaging. Description of the Drawings

[0043] In order to more clearly illustrate the embodiments of the present application or the implementation manners in the related art, the following will briefly introduce the drawings required for use in the description of the embodiments or the related art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings.

[0044] Figure 1 Structural schematic diagram of the projection device provided by the present application Figure 1 ;

[0045] Figure 2 Schematic diagram of the change in the focal position provided by the present application;

[0046] Figure 3 Structural schematic diagram of the projection device provided by the present application Figure 2 ;

[0047] Figure 4 Schematic diagram of the light-transmitting area provided by the present application;

[0048] Figure 5a Flow schematic diagram of the temperature drift correction method provided by the present application;

[0049] Figure 5b Schematic diagram of the preset regression equation provided by this application;

[0050] Figure 5c Schematic diagram for comparing projection images before and after focusing provided by this application;

[0051] Figure 6 Schematic flow chart for determining target movement data provided by this application Figure 1 ;

[0052] Figure 7 Schematic flow chart for determining target movement data provided by this application Figure 2 ;

[0053] Figure 8 Schematic structural diagram of an embodiment of the temperature drift correction device provided by this application. Detailed implementation manners

[0054] To make the objectives, implementation manners, and advantages of this application clearer, the following will clearly and completely describe the exemplary implementation manners of this application with reference to the accompanying drawings in the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only a part rather than all of the embodiments of this application.

[0055] It should be noted that the brief description of terms in this application is only for facilitating the understanding of the subsequent described implementation manners, rather than intending to limit the implementation manners of this application. Unless otherwise specified, these terms should be understood in their ordinary and general meanings.

[0056] In this application, terms such as "first", "second", "third", etc. in the description, claims, and the above-mentioned drawings are used to distinguish similar or like objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that such terms can be interchanged under appropriate circumstances, for example, it is possible to implement in an order other than those given in the illustration or description of the embodiments of this application.

[0057] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclude inclusion. For example, a product or device including a series of components does not necessarily have to be limited to those components clearly listed, but may include other components not clearly listed or inherent to these products or devices.

[0058] With the development of technology, projection devices can project images or videos onto a screen or wall, and have been widely used in scenarios such as homes and meeting rooms.

[0059] Exemplarily, Figure 1 Schematic diagram of the structure of the projection device provided by this application Figure 1 , such asFigure 1 As shown in the figure, the projection device includes a light source, a light homogenizing component, a light modulation component, and a lens component. The light generated by the light source irradiates on the light homogenizing component, and the light homogenizing component homogenizes the light generated by the light source, which can improve the brightness and contrast, and then irradiates on the light modulation component. After the light modulation component modulates the light, it is projected onto the screen through the lens component.

[0060] During the operation of the projection device, a large amount of heat is generated, and the internal temperature of the projection device rises. According to the formula ε = α * ΔT, where ε represents the deformation amount, α represents the thermal expansion coefficient, and ΔT represents the temperature change amount, it can be known that the lens component in the projection device is affected by the temperature change, and the lenses in the lens component will deform, resulting in a change in the focal position of the lens component, the projection image is not clear, and a temperature drift phenomenon occurs.

[0061] Exemplarily, Figure 2 is a schematic diagram of the change in the focal position provided by this application. As Figure 2 shown in the figure, the lens formed by the solid line in the figure is the lens before being affected by the temperature, and the corresponding focal point of this lens is focal point A. The lens formed by the dotted line is the lens after being affected by the temperature. Compared with the lens before being affected by the temperature, this lens has deformed, and the corresponding focal point of this lens is focal point B. Focal point A and focal point B are not in the same position, the focal position has changed, and further the projection image will not be clear.

[0062] In view of the problems existing in the prior art, the inventor found during the research on the temperature drift correction method that a focusing lens group can be added to the lens. For multiple lenses in the lens, temperature sensors are set for the lenses, and it is determined whether the lenses are affected by the temperature according to the temperature values obtained by the temperature sensors. When it is determined that the lens is affected by the temperature, the target movement data is determined according to the temperature value of the lens, and then the focusing lens group moves according to the target movement data for focusing. It realizes focusing when the temperature changes, corrects the temperature drift phenomenon, and the accuracy of focusing is relatively high, and the projected image is clearer.

[0063] The application scenarios of the projection device provided by this application will be exemplified below.

[0064] Exemplarily, in this application scenario, after the projection device is powered on, the temperature gradually rises during the operation. The controller in it obtains the temperature value of the lens through the temperature sensor in each sampling period.

[0065] For each lens equipped with a temperature sensor, if the absolute value of the difference between the first temperature value obtained by this lens in the current sampling period and the second temperature value obtained in the previous sampling period of the current sampling period is greater than the preset temperature difference threshold, the controller takes it as the target lens.

[0066] After determining the target movement data based on the first temperature value and the second temperature value of the target lens, send it to the focusing lens group.

[0067] The focusing lens group moves according to the target movement data for focusing, compensating for the focal change amount of the lens assembly, correcting the temperature drift phenomenon, and making the projected image clearer.

[0068] It should be noted that the above scenario is only an example of an application scenario provided by the embodiments of the present application. The embodiments of the present application do not limit the actual forms of various devices included in this scenario, nor do they limit the interaction methods between devices. In the specific application of the solution, it can be set according to actual needs.

[0069] Figure 3 Structural schematic of the projection device provided by the present application Figure 2 , as Figure 3 shown, the projection device includes a lens assembly, a controller 301, and multiple temperature sensors (7 temperature sensors are shown in the figure, namely temperature sensors 302 - 308). The lens assembly includes a lens barrel 309, a focusing lens group 310 in the lens barrel 309, and multiple lenses (4 lenses are shown in the figure, namely lenses 311 - 314). The multiple lenses include a lens and a curved mirror. In the figure, lens 311 is a curved mirror, and lenses 312 - 314 are lenses.

[0070] The controller 301 is respectively connected to the focusing lens group 310 and multiple temperature sensors (temperature sensors 302 - 308); at least one temperature sensor corresponding to the lens is installed outside the connection position of the lens barrel 309 to the lens among the multiple lenses; at least one temperature sensor corresponding to the curved mirror is installed on the curved mirror among the multiple lenses. Lens 311 corresponds to 3 temperature sensors, namely temperature sensors 302 - 304; lens 312 corresponds to 2 temperature sensors, namely temperature sensors 305 - 306; lens 314 corresponds to 1 temperature sensor, namely temperature sensor 307; lens 315 corresponds to 1 temperature sensor, namely temperature sensor 308.

[0071] It should be noted that when the lens with the temperature sensor installed is a curved mirror, the temperature sensor is installed on the non - reflective surface of the lens, which does not affect imaging and can also obtain the temperature of the lens.

[0072] It should be noted that for the lens with the temperature sensor installed in the lens assembly, it can be divided into a light - transmitting area and a non - light - transmitting area. The light - transmitting area refers to the area through which light passes during the operation of the projection device. Exemplarily, Figure 4 Schematic diagram of the light - transmitting area provided by the present application, as Figure 4As shown in the figure, the lines in the figure represent light rays. It can be seen that there are areas where light passes through and areas where light does not pass through in the lens. The area where light passes through is the light-transmitting area, and the area where light does not pass through is the non-light-transmitting area. Only the light-transmitting area and the non-light-transmitting area of one lens are shown in the figure. The light-transmitting area is more affected by temperature. By installing the temperature sensor outside the connection position between the light-transmitting area of the lens in the lens barrel and the lens barrel, it is possible to avoid affecting imaging and obtain the lens temperature.

[0073] It should be noted that the materials of the multiple lenses in the lens assembly can be plastic, glass, polycarbonate, etc. In the embodiments of the present application, the materials, quantities, and shapes of the multiple lenses in the lens assembly are not limited, the positions of the focusing lens group and the lenses in the lens assembly are not limited, and the number of temperature sensors corresponding to one lens is not limited, and can be set according to actual situations.

[0074] It should be noted that corresponding heat dissipation devices can also be installed for the lens assembly and the controller to reduce the temperatures of the lens assembly and the controller.

[0075] Figure 5a It is a schematic flowchart of the temperature drift correction method provided by the present application. The execution subject of this method can be a projection device. The method in this embodiment can be implemented by software, hardware, or a combination of software and hardware.

[0076] As Figure 5a shown, the controller in the projection device is configured to perform the following steps:

[0077] S501: Through the temperature sensor corresponding to the lens, obtain the first temperature value of the lens in the current sampling period and the second temperature value of the lens in the previous sampling period of the current sampling period.

[0078] In this step, the controller obtains the temperature value of the lens through the temperature sensor in each sampling period. In the current sampling period, for each lens equipped with a temperature sensor, through the temperature sensor corresponding to the lens, obtain the first temperature value of the lens in the current sampling period and the second temperature value of the lens in the previous sampling period of the current sampling period.

[0079] The first temperature value is the average value of the third temperature values obtained through the temperature sensor corresponding to the lens in the current sampling period, or the maximum value among the third temperature values.

[0080] The second temperature value is the average value of the fourth temperature values obtained through the temperature sensor corresponding to the lens in the previous sampling period of the current sampling period, or the maximum value among the fourth temperature values.

[0081] When the first temperature value is the average value of the third temperature values, the second temperature value is the average value of the fourth temperature values; when the first temperature value is the maximum value among the third temperature values, the second temperature value is the maximum value among the fourth temperature values.

[0082] S502: If the absolute value of the difference between the first temperature value and the second temperature value is greater than the preset temperature difference threshold, then the lens is regarded as the target lens.

[0083] In this step, after the controller obtains the first temperature value and the second temperature value, for each lens installed with a temperature sensor, if the absolute value of the difference between the first temperature value and the second temperature value of the lens is greater than the preset temperature difference threshold, it indicates that the lens is affected by temperature, then the lens is regarded as the target lens.

[0084] It should be noted that the preset temperature difference threshold can be 0.5°C, 1°C, 2°C, etc. The embodiments of the present application do not limit the preset temperature difference threshold, which can be set according to the actual situation.

[0085] S503: Determine the target movement data according to the first temperature value and the second temperature value of the target lens.

[0086] In this step, after the controller determines the target lens, it determines the target movement data according to the first temperature value and the second temperature value of the target lens.

[0087] Specifically, according to the first temperature value and the second temperature value of the target lens, determine the initial temperature difference of the target lens; that is, for each target lens, subtract the second temperature value from the first temperature value of the target lens to obtain the initial temperature difference of the target lens.

[0088] Furthermore, calculate the target movement data according to the initial temperature difference of the target lens and the preset regression equation.

[0089] It should be noted that the preset regression equation is an equation obtained by fitting according to multiple temperature difference data and the movement data corresponding to the temperature difference data, and this equation can more accurately reflect the corresponding relationship between the temperature difference and the movement data.

[0090] Exemplarily, Figure 5b is a schematic diagram of the preset regression equation provided by the present application, as Figure 5b shown, the regression equation is a quadratic equation of one variable.

[0091] It should be noted that the above example is only an example of the regression equation. The regression equation can be a linear equation of one variable, a quadratic equation of one variable, a cubic equation of one variable, etc. The embodiments of the present application do not limit the regression equation, which can be set according to the actual situation.

[0092] S504: Send the target movement data to the focusing lens group.

[0093] In this step, after obtaining the target movement data, the controller needs to send the target movement data to the focusing lens group so that the focusing lens group can move.

[0094] The focusing lens group is configured to move according to the target movement data for focusing.

[0095] Exemplarily, Figure 5c is a schematic diagram of the comparison of the projection images before and after focusing provided by this application. As Figure 5c shown, before focusing, the text in the projection image is not clear. After focusing, the text in the projection image becomes clear.

[0096] It should be noted that the focusing lens group includes a motor and at least one lens. The rotation of the motor can drive the movement of the focusing lens group. If the motor rotates precisely according to the control parameters, the rotation direction and control parameters corresponding to the target movement data can be determined. The control parameters can be the number of turns, the number of steps, the rotation duration, etc. The motor rotates according to the rotation direction and control parameters to realize the movement of the focusing lens group for focusing.

[0097] If only the rotation direction of the motor can be controlled, the focusing lens group further includes a position sensor. The focusing lens group determines the rotation direction corresponding to the target movement data, controls the motor to rotate according to the rotation direction, and sends the position of the focusing lens group to the controller in real time through the position sensor. When the controller monitors that the position sent by the position sensor is consistent with the position corresponding to the target movement data, it sends a stop instruction to the focusing lens group and the motor stops rotating.

[0098] It should be noted that if the current cycle is the first cycle after the projection device is powered on, after the controller obtains the first temperature value of the lens in the current sampling cycle, it determines the corresponding reference position data according to the first temperature value, and then sends the reference position data to the focusing lens group. The focusing lens group moves to the position corresponding to the reference position data.

[0099] It should be noted that if the absolute value of the difference between each lens equipped with a temperature sensor is less than or equal to the preset temperature difference threshold, it means that each lens is not affected by temperature. In the current sampling cycle, the controller does not need to determine the target movement data, and the focusing lens group does not need to move either.

[0100] The projection device provided in this embodiment includes a lens assembly, a controller, and multiple temperature sensors. The lens assembly includes a lens barrel, multiple lenses, and a focusing lens group. The multiple lenses include a lens and a curved mirror. Corresponding temperature sensors are respectively configured for the multiple lenses in the lens assembly. The controller obtains the first temperature value of each lens in the current sampling period and the second temperature value in the previous sampling period of the current sampling period through the sensors. Then, according to the difference between the first temperature value and the second temperature value, the target lens is determined from the multiple lenses. After that, according to the first temperature value and the second temperature value of the target lens, the target movement data is determined and sent to the focusing lens group. The focusing lens group moves according to the target movement data for focusing. It can achieve focusing when the temperature changes, correct the temperature drift phenomenon, and the accuracy of focusing is relatively high, and the projected image is clearer.

[0101] Further, on the basis of the above embodiment, this embodiment of the present application describes the situation where the controller determines the target temperature difference according to the initial temperature difference, and then combines the preset first regression equation to obtain the target movement data. Figure 6 Schematic flow of determining the target movement data provided by the present application Figure 1 Among them, the controller in the projection device is configured to execute the following steps:

[0102] S601: Generate a target temperature difference according to the initial temperature difference of the target lens.

[0103] In this step, after the controller obtains the initial temperature difference of each target lens, it generates a target temperature difference according to the initial temperature difference of the target lens.

[0104] Specifically, the maximum value of the initial temperature differences of all target lenses, or the average value of the initial temperature differences of all target lenses, is used as the target temperature difference.

[0105] S602: Calculate the target movement data according to the target temperature difference and the preset first regression equation.

[0106] In this step, after the controller obtains the target temperature difference, it substitutes the target temperature difference into the preset first regression equation to obtain the target movement data.

[0107] The projection device provided in this embodiment first obtains the target temperature difference according to the initial temperature difference, and then substitutes it into the first regression equation to obtain the target movement data, so that the accuracy of the obtained target movement data is relatively high and can meet the focusing requirements.

[0108] Further, on the basis of the above embodiment, this embodiment of the present application describes the situation where the controller obtains the initial movement data according to the initial temperature difference and the preset second regression equation, and then generates the target movement data. Figure 7Flow diagram for determining target movement data provided by this application Figure 2 , where the controller in the projection device is configured to perform the following steps:

[0109] S701: Calculate the initial movement data of the target lens according to the initial temperature difference of the target lens and the preset second regression equation corresponding to the target lens.

[0110] In this step, after the controller obtains the initial temperature difference of each target lens, for each target lens, substitute the initial temperature difference of the target lens into the preset second regression equation corresponding to the target lens to obtain the initial movement data of the target lens.

[0111] S702: Generate target movement data according to the initial movement data of the target lens.

[0112] In this step, after the controller obtains the initial movement data of each target lens, generate target movement data according to the initial movement data of the target lens.

[0113] Specifically, determine the maximum value among the initial movement data of all target lenses, or the average value of the initial movement data of all target lenses, as the target movement data.

[0114] The projection device provided in this embodiment first determines the initial movement data of each target lens according to the initial temperature difference and the second regression equation, and then generates the target movement data, so that the obtained target movement data has high accuracy and can meet the focusing requirements.

[0115] In this application, a temperature drift correction method is also provided, and its steps can be:

[0116] Obtain the first temperature value of the lens in the current sampling period and the second temperature value in the previous sampling period of the current sampling period;

[0117] If the absolute value of the difference between the first temperature value and the second temperature value is greater than the preset temperature difference threshold, then regard the lens as the target lens;

[0118] Determine the target movement data according to the first temperature value and the second temperature value of the target lens;

[0119] Control the focusing lens group to move according to the target movement data for focusing.

[0120] For the specific implementation steps and technical effects, please refer to the above embodiments, and this application will not repeat them.

[0121] Figure 8Schematic diagram of the structure of the embodiment of the temperature drift correction device provided by the present application; this device can be integrated into the projection device in the above method embodiment, or can be implemented by the projection device in the above method embodiment. As Figure 8 shown, the temperature drift correction device 80 includes:

[0122] An acquisition module 81, configured to acquire a first temperature value of the lens in the current sampling period and a second temperature value of the lens in the previous sampling period of the current sampling period;

[0123] A processing module 82, configured to:

[0124] If the absolute value of the difference between the first temperature value and the second temperature value is greater than a preset temperature difference threshold, then use the lens as the target lens;

[0125] Determine target movement data according to the first temperature value and the second temperature value of the target lens;

[0126] A focusing module 83, configured to control the focusing lens group to move according to the target movement data for focusing.

[0127] Further, the processing module 82 is specifically configured to:

[0128] Determine an initial temperature difference of the target lens according to the first temperature value and the second temperature value of the target lens;

[0129] Calculate the target movement data according to the initial temperature difference of the target lens and a preset regression equation.

[0130] Further, the processing module 82 is specifically configured to:

[0131] Generate a target temperature difference according to the initial temperature difference of the target lens;

[0132] Calculate the target movement data according to the target temperature difference and a preset first regression equation.

[0133] Further, the processing module 82 is specifically configured to:

[0134] Use the maximum value in the initial temperature difference, or the average value of the initial temperature differences, as the target temperature difference.

[0135] Further, the processing module 82 is specifically configured to:

[0136] Calculate the initial movement data of the target lens according to the initial temperature difference of the target lens and a preset second regression equation corresponding to the target lens;

[0137] Generate the target movement data according to the initial movement data of the target lens.

[0138] Further, the processing module 82 is specifically configured to:

[0139] Determine the maximum value in the initial movement data or the average value of the initial movement data as the target movement data. Further, the preset regression equation is an equation obtained by fitting based on multiple temperature difference data and the movement data corresponding to the temperature difference data.

[0140] Further, the first temperature value is the average value of the third temperature values obtained by the temperature sensor corresponding to the lens in the current sampling period, or the maximum value of the third temperature values;

[0141] The second temperature value is the average value of the fourth temperature values obtained by the temperature sensor corresponding to the lens in the sampling period previous to the current sampling period, or the maximum value of the fourth temperature values.

[0142] Further, if the lens with the temperature sensor installed is a lens, the temperature sensor is installed outside the connection position between the light-transmitting area of the lens in the lens barrel and the lens barrel.

[0143] Further, if the lens with the temperature sensor installed is a curved mirror, the temperature sensor is installed on the non-reflective surface of the lens.

[0144] The temperature drift correction device provided in this embodiment is used to execute the technical solutions in any of the foregoing embodiments, and its implementation principle and technical effects are similar, and will not be elaborated here.

[0145] The embodiment of the present application further provides a readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the technical solutions provided in any of the foregoing embodiments are implemented.

[0146] The embodiment of the present application further provides a computer program product, including a computer program, and when the computer program is executed by a processor, it is used to implement the technical solutions provided in any of the foregoing embodiments.

[0147] Those of ordinary skill in the art can understand that all or part of the steps of implementing the foregoing method embodiments can be completed by hardware related to program instructions. The foregoing program can be stored in a computer-readable storage medium. When the program is executed, the steps of the foregoing method embodiments are executed; and the foregoing storage medium includes: various media such as ROM, RAM, magnetic disk, or optical disc that can store program codes.

[0148] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0149] For the sake of explanation, the above description has been presented in connection with specific embodiments. However, the above exemplary discussions are not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Many modifications and variations are possible in light of the above teaching. The selection and description of the embodiments are intended to best explain the principles and practical applications, to thereby enable those skilled in the art to best utilize the embodiments and various embodiments adapted to specific uses contemplated.

Claims

1. A projection device, characterized in that, The projection device includes: a lens assembly, a controller, and multiple temperature sensors. The lens assembly includes a lens barrel, a focusing lens group and multiple lenses in the lens barrel. The multiple lenses include a lens and a curved mirror; The controller is respectively connected to the focusing lens group and the multiple temperature sensors; at least one temperature sensor corresponding to the lens is installed outside the connection position of the lens barrel and the lens among the multiple lenses; at least one temperature sensor corresponding to the curved mirror is installed on the curved mirror among the multiple lenses; The controller is configured to: obtain, through the temperature sensor corresponding to the lens, a first temperature value of the lens in the current sampling period and a second temperature value in the previous sampling period of the current sampling period; if the absolute value of the difference between the first temperature value and the second temperature value is greater than a preset temperature difference threshold, then take the lens as the target lens; determine target movement data according to the first temperature value and the second temperature value of the target lens; send the target movement data to the focusing lens group; The focusing lens group is configured to: move according to the target movement data for focusing.

2. The projection device according to claim 1, wherein When the controller is configured to determine the target movement data according to the first temperature value and the second temperature value of the target lens, it is specifically configured to: determine an initial temperature difference of the target lens according to the first temperature value and the second temperature value of the target lens; calculate the target movement data according to the initial temperature difference of the target lens and a preset regression equation.

3. The projection device according to claim 2, wherein When the controller is configured to calculate the target movement data according to the initial temperature difference of the target lens and a preset regression equation, it is specifically configured to: generate a target temperature difference according to the initial temperature difference of the target lens; calculate the target movement data according to the target temperature difference and a preset first regression equation.

4. The projection device according to claim 3, wherein When the controller is configured to generate a target temperature difference according to the initial temperature difference of the target lens, it is specifically configured to: take the maximum value in the initial temperature difference, or the average value of the initial temperature differences, as the target temperature difference.

5. The projection device according to claim 2, wherein, When the controller is configured to calculate the target movement data according to the initial temperature difference of the target lens and a preset regression equation, it is specifically configured to: calculate the initial movement data of the target lens according to the initial temperature difference of the target lens and a preset second regression equation corresponding to the target lens; generate the target movement data according to the initial movement data of the target lens.

6. The projection device according to claim 5, characterized in that, When the controller is configured to generate the target movement data according to the initial movement data, it is specifically configured to: determine the maximum value in the initial movement data, or the average value of the initial movement data, as the target movement data.

7. The projection device according to claim 2, wherein The preset regression equation is an equation obtained by fitting multiple temperature difference data and the movement data corresponding to the temperature difference data.

8. The projection device according to any one of claims 1 to 7, characterized in that, The first temperature value is the average value of the third temperature values obtained by the temperature sensor corresponding to the lens in the current sampling period, or the maximum value among the third temperature values; The second temperature value is the average value of the fourth temperature values obtained by the temperature sensor corresponding to the mirror in the previous sampling period of the current sampling period, or the maximum value among the fourth temperature values.

9. The projection device according to any one of claims 1 to 7, characterized in that, If the lens with the temperature sensor installed is a lens, the temperature sensor is installed outside the connection position between the light-transmitting area of the lens in the lens barrel and the lens barrel.

10. The projection device according to any one of claims 1 to 7, characterized in that, If the lens with the temperature sensor installed is a curved mirror, the temperature sensor is installed on the non-reflecting surface of the lens.

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