Power control method, projection device and computer readable storage medium

Abstract

The application provides a power control method, a projection device and a computer readable storage medium. The power control method is applied to the projection device, the projection device comprises a light source, and the power control method comprises the following steps: recording the cumulative use time of the projection device; determining a preset time interval in which the cumulative use time is located according to the cumulative use time; determining a preset power value corresponding to the preset time interval according to the preset time interval; and controlling the light source of the projection device to work according to the preset power value. The power control method can effectively prolong the service life of the polarizer.

Description

Technical Field

[0001] This invention relates to the field of projection display technology, and in particular to a power control method, a projection device, and a computer-readable storage medium. Background Technology

[0002] Single-LCD projection technology is widely used due to its low cost, small size, and simple principle. The optical path is as follows: the light beam emitted from the light source is polarized by a polarizer, then spatially modulated by the liquid crystal display panel, and finally projected onto the image through components such as a Fresnel lens. Specifically, a polarizer is placed on both the light-incident and light-exit sides of the liquid crystal display panel to jointly control the brightness and color of the light.

[0003] Currently, polarizers work by transmitting light along their transmission axis and absorbing light in orthogonal directions. Because absorbing a large amount of light generates significant heat, polarizers operating in high-temperature environments for extended periods will yellow and fail, leading to display abnormalities and severely impacting the lifespan of projection devices.

[0004] Therefore, how to effectively extend the service life of polarizers is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] This application provides a power control method, a projection device, and a computer-readable storage medium, which can effectively extend the service life of polarizers.

[0006] This application provides a power control method applied to a projection device, the projection device including a light source, the power control method comprising: Record the cumulative usage time of the projection device; Based on the accumulated usage time, determine the preset time interval in which the accumulated usage time falls; Based on the preset time interval, determine the preset power value corresponding to the preset time interval; The light source of the projection device is controlled to operate according to the preset power value.

[0007] In some embodiments, the preset time interval includes multiple consecutive time intervals; when the cumulative usage time is less than a first threshold, as the cumulative usage time increases, the preset power value corresponding to the later time interval is less than the preset power value corresponding to the previous time interval.

[0008] In some embodiments, the decrease in the preset power value of the later time interval relative to the earlier time interval is a fixed percentage or a fixed difference.

[0009] In some embodiments, the first threshold is 400 hours; the preset power value corresponding to the later time interval is less than the preset power value corresponding to the previous time interval, including: When the cumulative usage time is between 0 and 100 hours, the preset power value is 100%. When the cumulative usage time is between 101 and 200 hours, the preset power value is 90%. When the cumulative usage time is between 201 and 300 hours, the preset power value is 80%. When the cumulative usage time is between 301 and 400 hours, the preset power value is 70%.

[0010] In some embodiments, the preset time interval includes multiple consecutive time intervals; when the cumulative usage time exceeds the second threshold, the preset power value corresponding to the next time interval is greater than the preset power value corresponding to the previous time interval.

[0011] In some embodiments, the increase in the preset power value of the later time interval relative to the earlier time interval is a fixed percentage or a fixed difference.

[0012] In some embodiments, the second threshold is 2000 hours; the preset power value corresponding to the later time interval is greater than the preset power value corresponding to the previous time interval, including: when the cumulative usage time reaches 2000 hours, the preset power value is adjusted to 80%; when the cumulative usage time reaches 3000 hours, the preset power value is adjusted to 100%.

[0013] In some embodiments, the preset power value is updated when the projection device is powered on for the next time.

[0014] This application also provides a projection device, including: light source; A liquid crystal light valve, wherein the liquid crystal light valve is disposed on the light-emitting side of the light source; A first polarizer and a second polarizer, wherein the first polarizer is disposed on the light-incident side of the liquid crystal light valve and the second polarizer is disposed on the light-outceasing side of the liquid crystal light valve; A processor, connected to the light source, is used to execute the power control method described above.

[0015] In some embodiments, the projection device further includes heat-insulating glass disposed between the first polarizer and the light source.

[0016] In some embodiments, the projection device further includes a storage module connected to a processor, the storage module being used to record the cumulative usage time of the projection device.

[0017] In some embodiments, the storage module is a non-volatile memory.

[0018] This application also provides a computer-readable storage medium storing computer instructions thereon, which, when executed by a processor, implement the power control method described above.

[0019] This application provides a power control method, a projection device, and a computer-readable storage medium. The power control method is applied to a projection device. The power control method includes: first, recording the cumulative usage time of the projection device as a control basis; second, determining a preset time interval based on the cumulative usage time; then, calling a preset power value corresponding to the preset time interval; and finally, controlling the light source of the projection device to operate according to the preset power value. In this embodiment, by dynamically reducing the light source power, the luminous flux illuminating the polarizer is reduced from the source, thereby suppressing temperature rise and effectively extending the lifespan of the polarizer. Attached Figure Description

[0020] 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 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.

[0021] Figure 1 This is a schematic diagram of a first structure of the projection device provided in an embodiment of this application.

[0022] Figure 2 This is a schematic flowchart of the power control method provided in an embodiment of this application.

[0023] Figure 3 This is a schematic diagram of a second structure of the projection device provided in an embodiment of this application.

[0024] Figure 4 This is a schematic diagram of a third structure of the projection device provided in the embodiments of this application. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] This application provides a power control method, a projection device, and a computer-readable storage medium, which can effectively extend the service life of polarizers. The following is a detailed description in conjunction with the accompanying drawings.

[0027] Please see Figure 1 , Figure 1 This is a schematic diagram of a first structure of the projection device provided in an embodiment of this application.

[0028] This application provides a power control method applied to a projection device 100, particularly a single-panel liquid crystal (LCD) projection device.

[0029] The projection device 100 includes a light source 101. The light source 101 refers to the optical components within the projection device 100 used to generate an illumination beam. In this application, the light source 101 can be a light-emitting diode (LED) or a laser diode. The light source 101 also includes a drive circuit that provides it with a stable current or pulse-width modulation signal, which enables dynamic adjustment of the output power.

[0030] Furthermore, the projection device 100 also includes a liquid crystal light valve 102, a first polarizer 103, a second polarizer 104, and a lens assembly 105. The liquid crystal light valve 102 is disposed on the light-emitting side of the light source 101, the first polarizer 103 is disposed on the light-incident side of the liquid crystal light valve 102, the second polarizer 104 is disposed on the light-emitting side of the liquid crystal light valve 102, and the lens assembly 105 is disposed on the light-emitting side of the second polarizer 104.

[0031] The function of the first polarizer 103 is to convert the light emitted from the light source 101 into linearly polarized light, providing input conditions for the modulation of the liquid crystal light valve 102.

[0032] The liquid crystal light valve 102 is the core component for image generation, typically comprising a color filter, a liquid crystal cell, and a thin-film transistor (TFT) layer arranged sequentially. Since the liquid crystal cell is a polarized device, linearly polarized light is required for effective grayscale modulation. Unpolarized light emitted from the light source must pass through the first polarizer 103 before being used by the liquid crystal cell. The color filter consists of an array of red, green, and blue sub-pixels, and its function is to spatially separate the linearly polarized white light passing through the first polarizer 103, transmitting one of the three primary colors (red, green, and blue) at each sub-pixel position. The liquid crystal cell encapsulates a layer of liquid crystal molecules, and transparent electrodes and alignment layers are provided on the upper and lower substrates. The TFT layer acts as an active driving matrix, controlling the voltage on each sub-pixel electrode, thereby changing the twist angle of the liquid crystal molecules at the corresponding position, and thus controlling the polarization direction of the emitted light.

[0033] The second polarizer 104, also known as an analyzer, has its transmission axis orthogonal or parallel to that of the first polarizer 103. Together with the liquid crystal light valve 102, it modulates the grayscale of the light. After being modulated by the liquid crystal light valve 102, the polarization direction of the emitted light has been rotated according to the grayscale level. The second polarizer 104 selectively allows or blocks the light to pass through according to its transmission axis direction, thereby converting polarization information into brightness information and forming a grayscale image.

[0034] Lens assembly 105 is disposed on the light-emitting side of the second polarizer 104. Lens assembly 105 generally includes a Fresnel lens for converging light and a projection lens for imaging. Its function is to magnify the imaging beam after passing through the second polarizer 104 and project it onto a screen or wall to form a visible image.

[0035] The first polarizer 103 or the second polarizer 104 can be an absorption polarizer, optionally an iodine-based polarizer. An iodine-based polarizer is a polarizing element made by adsorbing and orienting iodine molecular chains onto a polyvinyl alcohol film. The working principle of an iodine-based polarizer is that the component of light aligned with the transmission axis of the polarizer passes through, while the component orthogonal to it is absorbed by the iodine molecular chains and converted into heat energy. Iodine-based polarizers have advantages such as high polarization degree, readily available raw materials, and low manufacturing cost.

[0036] However, especially for the first polarizer 103, which is closer to the light source 101, the iodine-based polarizer is prone to breakage, diffusion or bleaching of its internally oriented iodine molecular chains under long-term exposure to high-intensity light and continuous heating, which can easily lead to problems such as decreased light transmittance, yellowing and deterioration of contrast.

[0037] By using the above-described projection device 100 and in conjunction with the power control method provided in the embodiments of this application, active management can be achieved from the source of heat without increasing costs or changing the optical architecture, thus achieving a balance between the lifespan and performance of the projection device 100.

[0038] Please see Figure 2 , Figure 2 This is a schematic flowchart of the power control method provided in an embodiment of this application.

[0039] The power control method includes the following steps.

[0040] S10, Record the cumulative usage time of the projection device 100.

[0041] The cumulative usage time refers to the total working time of the projection device 100 from its first power-on or from a certain reference time point, such as when it leaves the factory, while its light source 101 is in the lit state. In this embodiment of the application, the cumulative usage time is accumulated and recorded by the processor of the projection device 100, such as an MCU (microcontroller unit), in conjunction with a real-time clock or timer.

[0042] Specifically, the processor within the projection device 100, such as a microcontroller unit, starts timing each time the light source 101 is turned on, and adds the timing value to a variable representing the cumulative usage time stored in non-volatile memory. This recording process can save data when the projection device 100 is in standby mode or when the power is off, ensuring that the data is not lost.

[0043] S20. Determine the preset time interval in which the cumulative usage time falls based on the cumulative usage time.

[0044] The preset time interval refers to a range of consecutive cumulative usage time pre-defined based on experimental or theoretical analysis of the thermal aging characteristics of the polarizer. Each preset time interval corresponds to a specific power control scheme for the light source 101.

[0045] S30. Determine the preset power value corresponding to the preset time interval based on the preset time interval.

[0046] The preset power value refers to the power that the light source 101 of the projection device 100 should output for each of the above preset time intervals. This preset power value is usually expressed as a percentage of the rated power or a specific power value.

[0047] S40. Control the light source 101 of the projection device 100 to work according to the preset power value.

[0048] Specifically, a command is sent to the driving circuit of the light source 101 via a pulse width modulation signal or an analog dimming signal to adjust its output power to a preset power value.

[0049] In the power control method provided in this application embodiment, by dynamically reducing the power of the light source 101 when it is working, the light flux irradiated onto the first polarizer 103 or the second polarizer 104 is reduced from the source, thereby suppressing the temperature rise and effectively extending the service life of the first polarizer 103 and / or the second polarizer 104.

[0050] In some embodiments, the preset time interval includes multiple consecutive time intervals; when the cumulative usage time is less than a first threshold, as the cumulative usage time increases, the preset power value corresponding to the later time interval is less than the preset power value corresponding to the previous time interval.

[0051] Among them, sequential continuity means that on the time axis, multiple time intervals are connected end to end without overlap or gap, together covering the complete span from time zero to the first threshold.

[0052] The first threshold is a preset time boundary point, the specific value of which can be calibrated based on the experimental data of the thermal aging characteristics of the polarizer, such as, but not limited to, 300 hours, 400 hours, 500 hours or other reasonable durations.

[0053] During the period when the cumulative usage time has not exceeded the first threshold, the power of the light source 101 of the projection device 100 decreases in a stepwise manner with the usage time, that is, the longer the usage time, the lower the preset power value.

[0054] Understandably, in the early stages of use of the projection device 100, the first polarizer 103 and the second polarizer 104 perform well. By actively reducing the preset power value of the light source 101, the thermal stress input within a unit time can be effectively reduced, thus delaying the aging time.

[0055] The decrease in the preset power value of the later time interval relative to the previous time interval is a fixed percentage or a fixed difference.

[0056] Specifically, the decrease was quantified using two methods: a fixed percentage and a fixed difference.

[0057] A fixed percentage means, for example, that the power value decreases by a fixed percentage compared to the previous interval after each time interval, such as 10%.

[0058] A fixed difference means that, for example, after each time interval, the power value is directly subtracted by a fixed power value, such as 1 watt.

[0059] In one optional implementation, the first threshold is 400 hours. The preset power value corresponding to the later time interval is less than the preset power value corresponding to the previous time interval, including the following steps.

[0060] When the cumulative usage time is between 0 and 100 hours, the preset power value is 100%.

[0061] When the cumulative usage time is between 101 and 200 hours, the preset power value is 90%.

[0062] When the cumulative usage time is between 201 and 300 hours, the preset power value is 80%.

[0063] When the cumulative usage time is between 301 and 400 hours, the preset power value is 70%.

[0064] In the above implementation, the power value in the later time interval is 10% lower than that in the previous time interval, forming a uniform step-down.

[0065] It should be noted that the preset power values ​​mentioned above are expressed as percentages and are relative numbers. This percentage refers to the ratio of the currently set light source output power to the rated power of the projection device, i.e., the standard operating power specified at the factory. For example, "preset power value is 90%" means that the actual output power of the light source is adjusted to 0.9 times the rated power. The rated power is a fixed reference value, usually calibrated based on the maximum allowable drive current and heat dissipation capacity of the light source.

[0066] The above-mentioned interval length of 100 hours per segment and the decrease rate of 10% per segment are merely examples. Depending on the different types of light sources 101, heat dissipation designs, target lifespan requirements, and the thermal tolerance curve of the polarizer, the number of intervals, interval length, and decrease rate per segment can be flexibly adjusted, such as a 5% decrease every 200 hours, or a 15% decrease for the first two segments and a 5% decrease for the last two segments, etc., all of which are reasonable variations covered by this solution.

[0067] In some embodiments, the preset time interval includes multiple consecutive time intervals; when the accumulated usage time exceeds the second threshold, the preset power value corresponding to the next time interval is greater than the preset power value corresponding to the previous time interval.

[0068] The second threshold is a preset time boundary point used to define the critical value for switching from the stage of actively reducing power to protect the polarizer to the stage of gradually restoring power to compensate for the inherent decay of the light source 101. The reason for setting the second threshold is that the thermal aging rate of the first polarizer 103 and the second polarizer 104 has slowed down after the initial protection; after several thousand hours of use, the luminous efficiency of the light source 101 will inevitably decay due to the accumulation of material defects, encapsulation aging, and other reasons. By gradually increasing the power after the second threshold, the inherent light decay of the light source 101 can be offset, and the relative stability of the brightness of the projected image can be maintained.

[0069] The second threshold is usually much larger than the first threshold; for example, the first threshold is 400 hours and the second threshold is 2000 hours. When the cumulative usage time exceeds the first threshold but does not reach the second threshold, the light source of the projection device maintains a minimum preset power value, such as 70%.

[0070] As defined above, consecutive time intervals refer to multiple time intervals that are connected end to end on the time axis without overlap or gaps, jointly covering the entire span from the second threshold to the end of the expected lifespan of the projection device, such as 5000 hours or longer.

[0071] The increase in the preset power value of the later time interval relative to the previous time interval is a fixed percentage or a fixed difference.

[0072] Similar to the aforementioned descent phase, the increase in the preset power value corresponding to the previous time interval in the later time interval can be quantified using either a fixed percentage or a fixed difference.

[0073] A fixed percentage means that, for example, the power value increases by a fixed percentage compared to the previous interval after each time interval, such as 20%.

[0074] A fixed difference means that, for example, the power value increases by a fixed power value, such as 1.5 watts, for each time interval.

[0075] In one optional implementation, the second threshold is 2000 hours. The preset power value corresponding to the later time interval is greater than the preset power value corresponding to the earlier time interval, including: when the cumulative usage time reaches 2000 hours, the preset power value is 80%; when the cumulative usage time reaches 3000 hours, the preset power value is adjusted to 100%.

[0076] In the example above, the time interval is 1000 hours, from 2000 hours to 3000 hours, and the preset power value increases by 20%, that is, from 80% to 100%.

[0077] As mentioned above, the preset power values ​​are expressed as percentages and are relative numbers. This percentage refers to the ratio of the currently set light source output power to the rated power of the projection device, i.e., the standard operating power specified at the factory.

[0078] It should be noted that this solution does not limit the second threshold to 2000 hours, nor does it limit it to only two time points. Depending on the type of light source 101, such as LEDs and laser diodes, and the specific tolerance of the polarizer, the start time, interval length, and rise amplitude of the power recovery can be flexibly configured. For example, the second threshold can be set to 1500 hours, with a 10% rise every 500 hours, or a non-uniform rise can be used, such as a slow rise at the beginning and a fast rise at the end. Any solution that uses power recovery to compensate for the attenuation of the light source 101 after the cumulative usage time exceeds a certain threshold falls within the protection scope of this application.

[0079] As described in the two embodiments above, the projection device 100 of this application embodiment can achieve three-stage power management during its use.

[0080] Phase 1: The cumulative usage time is 0 to 400 hours. In this phase, the power value of the light source 101 is reduced to protect the first polarizer 103 and / or the second polarizer 104, thereby significantly improving the lifespan of the first polarizer 103 and / or the second polarizer 104.

[0081] Second stage: The cumulative usage time is 400 to 2000 hours. In this second stage, the light source 101 is kept at a low power value, so that the first polarizer 103 and the second polarizer 104 are in a stable period.

[0082] Phase 3: Gradually increase the power value to 100% to compensate for the light decay of the light source and maintain the brightness level.

[0083] In some embodiments, the preset power value is updated when the projection device 100 is powered on for the next time.

[0084] The update of the preset power value refers to the process by which the projection device 100 re-queries or calculates the corresponding target power value based on the currently recorded cumulative usage time, and applies the target value to the driving circuit of the light source 101. This update may involve a decrease in the power value, for example, switching from 100% to 90%, or an increase, for example, switching from 80% to 100%.

[0085] The next power-on startup refers to the startup phase after the projection device 100 resumes power supply from a completely powered-off or standby state and executes the initialization process. Specifically, this moment falls between the completion of the system's power-on self-test and the normal illumination and image output of the light source 101, and is usually completed within a few milliseconds to a few seconds, to exclude the possibility of real-time or periodic power adjustments during continuous operation of the projection device 100, i.e., when the light source 101 is continuously illuminated.

[0086] In a specific implementation scenario, the control flow of the projection device 100 is as follows.

[0087] When a user powers on the device for the first time on a given day, the processor reads the cumulative usage time stored in non-volatile memory. Assuming the current cumulative usage time is 150 hours, but the last power-on time might have been 95 hours, and the current power-on determines that the usage time has entered the 101-200 hour range, the preset power value is updated from 100% in the previous cycle to 90%. Throughout this power-on cycle, the preset power value remains unchanged at 90%.

[0088] After watching continuously for 4 hours, the user shuts down the device. At this point, the cumulative usage time has increased to 154 hours, but has not yet entered the next range. Upon the next power-on, since the cumulative usage time is still in the 101-200 hour range, the preset power value remains unchanged at 90%.

[0089] The user continued to use the device multiple times, accumulating a total usage time of 210 hours. Upon the next power-on, the processor detected that the accumulated usage time had entered the 201-300 hour range and therefore updated the preset power consumption to 80%. The device then operated at 80% of the preset power consumption throughout the subsequent power-on cycle.

[0090] In the above process, each change in the preset power value occurs during the two power-on cycles, rather than during the viewing process.

[0091] This application embodiment prevents sudden brightness fluctuations in the projector during use. It is understood that if the power value of the light source 101 is suddenly changed during continuous operation of the projection device 100, for example, from 100% to 90%, the user will perceive a significant change in screen brightness, easily causing visual discomfort or even being mistaken for a malfunction of the projection device 100. This negative experience is particularly pronounced when the power drop is large, such as 10 percentage points, or when dynamic images are being played. In this application embodiment, by delaying the update of the power value until the next power-on, the brightness perceived by the user remains constant throughout a complete viewing cycle, thereby eliminating interference caused by dynamic adjustments.

[0092] Please continue reading. Figure 1 as well as Figure 3 , Figure 3 This is a second structural schematic diagram of the projection device provided in an embodiment of this application. An embodiment of this application also provides a projection device 100. The projection device 100 includes a light source 101, a liquid crystal light valve 102, a first polarizer 103, a second polarizer 104, a lens assembly 105, and a processor 106. The liquid crystal light valve 102 is disposed on the light-emitting side of the light source 101. The first polarizer 103 is disposed on the light-incident side of the liquid crystal light valve 102, and the second polarizer 104 is disposed on the light-emitting side of the liquid crystal light valve 102; the processor 106 is connected to the light source 101 and is used to execute the aforementioned power control method.

[0093] For a description of the light source 101, liquid crystal light valve 102, first polarizer 103, second polarizer 104 and lens assembly 105, please refer to the previous text, and it will not be repeated here.

[0094] The processor 106 is electrically connected to the light source 101. The processor 106 is the main body that executes the power control method. It runs firmware or software algorithms internally, which can record the cumulative usage time, determine the current time interval, determine the corresponding preset power value, and output control signals such as pulse width modulation signals or analog voltage signals to the light source 101 so that the light source 101 operates according to the preset power value.

[0095] The processor 106 is configured to execute the power control method described in any of the foregoing embodiments. Specifically, the control method includes at least the following steps: recording the cumulative usage time of the projection device 100; determining a preset time interval based on the cumulative usage time; determining a preset power value corresponding to the preset time interval based on the preset time interval; and controlling the light source 101 of the projection device 100 to operate according to the preset power value.

[0096] Please see Figure 4 ,Figure 4 This is a schematic diagram of a third structure of the projection device provided in the embodiments of this application.

[0097] In some embodiments, the projection device 100 further includes heat-insulating glass 107, which is disposed between the first polarizer 103 and the light source 101 to filter out infrared radiation and further reduce the heat load of the first polarizer 103 and the second polarizer 104.

[0098] An APF (Advanced Polarization Film) layer 108 is provided on the side of the heat-insulating glass 107 closest to the light source 101. The APF layer 108 acts as a reflective polarizer, pre-polarizing the incident light before the first polarizer 103: reflecting the orthogonal components back to the light source 101 side instead of absorbing them. In this way, the parallel components are transmitted into the first polarizer 103. Therefore, the first polarizer 103 only needs to handle about 50% of the incident light intensity, and its absorbed heat can theoretically be reduced by about half.

[0099] In some embodiments, the projection device 100 further includes a light cup 109, which is disposed between the light source 101 and the heat insulation glass 107, that is, located on the light-emitting side of the light source 101 and the light-incoming side of the heat insulation glass 107.

[0100] A reflector cup 109, also known as a reflector cup, condenser cup, or reflector bowl, is an optical element with a specific curved surface shape (such as a parabola, ellipsoid, or freeform surface). Its inner surface is coated or deposited with a highly reflective material (such as aluminum, silver, or a multilayer dielectric film) to collect light emitted from the light source 101 in various directions, reflecting, converging, or collimating it before guiding it into subsequent optical paths. The reflector cup 109 works in conjunction with the light source 101 to compensate for the light source 101's own large emission angle and poor directionality. The reflector cup 109 effectively improves light energy utilization.

[0101] In some embodiments, the projection device 100 further includes a storage module connected to the processor 106, the storage module being used to record the cumulative usage time of the projection device 100.

[0102] The storage module is a non-volatile memory, ensuring that data is not lost after power failure.

[0103] In some embodiments, the projection device 100 further includes heat dissipation components such as a fan or heat sink to reduce the overall internal temperature of the projection device 100, which can complement the active power reduction of this solution.

[0104] This application also provides a computer-readable storage medium storing computer instructions thereon, which, when executed by a processor, implement the power control method described above.

[0105] Computer-readable storage media refers to a physical carrier capable of storing data in a readable form and read by a computer or embedded device (such as a microcontroller in a projector). This medium is non-transitory, meaning the data stored in it is not lost after a power outage. Common implementations include: read-only memory (ROM), programmable read-only memory (PROM), electrically erasable programmable read-only memory (EEPROM), flash memory, solid-state drive (SSD), optical disc (CD-ROM, DVD), or magnetic storage media (hard disk, floppy disk), etc. In this application, the medium is preferably non-volatile memory to ensure that the firmware and configuration parameters of the projection device 100 are not lost after a long-term power outage.

[0106] Computer instructions are a set of executable operations represented in a specific encoding format (such as binary machine code, assembly code, or object code compiled from a high-level language). These instructions are organized into programs, firmware, or software modules, and when read and executed one by one by a processor, they enable the processor to perform specific logical operations, numerical judgments, and control output functions.

[0107] As defined above, a processor refers to an integrated circuit within the projection device 100 used to perform arithmetic and logic operations and control processes, including but not limited to a microcontroller unit (MCU), a central processing unit (CPU), a digital signal processor (DSP), or an application-specific integrated circuit (ASIC). The processor reads instructions from the computer-readable storage medium and executes them, forming the material basis for implementing the power control method.

[0108] When the projection device 100 is powered on, the processor reads instructions from the storage medium and performs the following operations according to the instruction sequence: records the cumulative usage time of the projection device 100; determines the preset time interval in which the cumulative usage time is located based on the cumulative usage time; determines the preset power value corresponding to the preset time interval based on the preset time interval; and controls the light source 101 of the projection device 100 to work according to the preset power value.

[0109] The power control method, projection device 100, and computer-readable storage medium provided in this application embodiment are applied to the projection device 100. The power control method includes: first, recording the cumulative usage time of the projection device 100 as a control basis; second, determining a preset time interval based on the cumulative usage time; then, calling a preset power value corresponding to the preset time interval; and finally, controlling the light source 101 of the projection device 100 to operate according to the preset power value. In this embodiment, by dynamically reducing the power of the light source 101, the luminous flux irradiating the polarizer is reduced from the source, thereby suppressing temperature rise and effectively extending the service life of the polarizer.

[0110] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0111] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0112] The power control method, projection device, and computer-readable storage medium provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application, and the descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A power control method, characterized in that, Applied to a projection device, the projection device including a light source, the power control method includes: Record the cumulative usage time of the projection device; Based on the accumulated usage time, determine the preset time interval in which the accumulated usage time falls; Based on the preset time interval, determine the preset power value corresponding to the preset time interval; The light source of the projection device is controlled to operate according to the preset power value.

2. The power control method according to claim 1, characterized in that, The preset time interval includes multiple consecutive time intervals; when the cumulative usage time is less than the first threshold, as the cumulative usage time increases, the preset power value corresponding to the later time interval is less than the preset power value corresponding to the previous time interval.

3. The power control method according to claim 2, characterized in that, The decrease in the preset power value of the later time interval relative to the previous time interval is a fixed percentage or a fixed difference.

4. The power control method according to claim 2, characterized in that, The first threshold is 400 hours; the preset power value corresponding to the later time interval is less than the preset power value corresponding to the earlier time interval, including: When the cumulative usage time is between 0 and 100 hours, the preset power value is 100%. When the cumulative usage time is between 101 and 200 hours, the preset power value is 90%. When the cumulative usage time is between 201 and 300 hours, the preset power value is 80%. When the cumulative usage time is between 301 and 400 hours, the preset power value is 70%.

5. The power control method according to claim 1, characterized in that, The preset time interval includes multiple consecutive time intervals; when the cumulative usage time exceeds the second threshold, the preset power value corresponding to the next time interval is greater than the preset power value corresponding to the previous time interval.

6. The power control method according to claim 5, characterized in that, The increase in the preset power value of the later time interval relative to the previous time interval is a fixed percentage or a fixed difference.

7. The power control method according to claim 5, characterized in that, The second threshold is 2000 hours; the preset power value corresponding to the later time interval is greater than the preset power value corresponding to the previous time interval, including: when the cumulative usage time reaches 2000 hours, the preset power value is 80%; when the cumulative usage time reaches 3000 hours, the preset power value is adjusted to 100%.

8. The power control method according to any one of claims 1 to 7, characterized in that, The preset power value is updated when the projection device is powered on for the next time.

9. A projection device, characterized in that, include: light source; A liquid crystal light valve, wherein the liquid crystal light valve is disposed on the light-emitting side of the light source; A first polarizer and a second polarizer, wherein the first polarizer is disposed on the light-incident side of the liquid crystal light valve and the second polarizer is disposed on the light-outceasing side of the liquid crystal light valve; A lens assembly disposed on the light-emitting side of the second polarizer; A processor connected to the light source for executing the power control method according to any one of claims 1 to 8.

10. The projection device according to claim 9, characterized in that, It also includes heat-insulating glass, which is disposed between the first polarizer and the light source.

11. The projection device according to claim 9, characterized in that, It also includes a storage module connected to the processor, which is used to record the cumulative usage time of the projection device.

12. The projection device according to claim 11, characterized in that, The storage module is a non-volatile memory.

13. A computer-readable storage medium storing computer instructions thereon, characterized in that, When the computer instructions are executed by the processor, they implement the power control method according to any one of claims 1 to 8.

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