TWI854127B - Projection system and projection method - Google Patents

Abstract

A projection system and a projection method are provided. The projection system includes a projection device. The projection device includes a projection module, a controller, and an audio player. The controller is coupled to the projection module. The audio player is coupled to the controller. When the controller executes a sleep-ready mode, the controller operates the projection module to dim the projection light or project a preset projection image, and operates the audio player to play a preset sound.

Description

Projection system and projection method

The present invention relates to an audio-visual system, and in particular to a projection system and a projection method.

At present, entertainment electronic products have become an indispensable part of human life, and many people will still use electronic products such as mobile phones, televisions or projectors until the last moment before going to bed. However, excessive dependence on these electronic products not only delays the user's sleep time, but also causes insomnia. In addition, after the user falls asleep, the display device of such electronic products may not be turned off, causing the display device to continue to operate. In other words, if such electronic products cannot be turned off automatically, it is not only easy to waste power, but may even disturb the user's sleep.

This "Prior Art" section is only used to help understand the content of the present invention. Therefore, the content disclosed in the "Prior Art" section may contain some knowledge that does not constitute the knowledge of the person with ordinary knowledge in the relevant technical field. The content disclosed in the "Prior Art" section does not mean that the content or the problems to be solved by one or more embodiments of the present invention have been known or recognized by the person with ordinary knowledge in the relevant technical field before the application of the present invention.

The present invention provides a projection system and a projection method that can provide appropriate projection images and audio effects in accordance with the user's sleeping behavior.

The projection system of the present invention includes a projection device. The projection device includes a projection module, a controller and an audio player. The controller is coupled to the projection module. The audio player is coupled to the controller. When the controller executes the sleep preparation mode, the controller operates the projection module to dim the projection beam or project a preset projection image, and operates the audio player to play a preset sound.

The projection method of the present invention is used for a projection system. The projection system includes a projection device. The projection device includes a projection module, a controller, and an audio player. The projection method includes the following steps: when the controller executes the sleep preparation mode, the controller operates the projection module to dim the projection beam or project a preset projection picture; and the controller operates the audio player to play a preset sound.

Based on the above, the projection system and projection method of the present invention can automatically adjust the projection beam or projection image, and can automatically adjust the audio effect to create an audio-visual environment suitable for the user to prepare for sleep.

In order to make the above features and advantages of the present invention more clearly understood, the following is a detailed description of the embodiments with the accompanying drawings.

100: Projection system

101: Physiological information

102: Physiological characteristic signals

103: Control signal

110: Processor

120: Physiological characteristics sensing device

130: Projection device

131: Controller

132: Projection module

133: Audio player

S210~S230: Steps

410~460, 510~520: Default projection screen

411~461, 511, 521: Image

Figure 1 is a circuit diagram of a projection system of an embodiment of the present invention.

Figure 2 is a flow chart of a projection method of an embodiment of the present invention.

FIG3A is a schematic diagram of an approximate power spectrum of white noise according to an embodiment of the present invention.

FIG. 3B is a schematic diagram of an approximate power spectrum of pink noise according to an embodiment of the present invention.

Figure 4A is a schematic diagram of the first projection image of an embodiment of the present invention.

Figure 4B is a schematic diagram of the second projection screen of an embodiment of the present invention.

Figure 4C is a schematic diagram of the third projection image of an embodiment of the present invention.

Figure 4D is a schematic diagram of the fourth projection image of an embodiment of the present invention.

Figure 4E is a schematic diagram of the fifth projection image of an embodiment of the present invention.

Figure 4F is a schematic diagram of the sixth projection image of an embodiment of the present invention.

FIG5A is a schematic diagram of a projection image with a specific wavelength according to an embodiment of the present invention.

FIG5B is a schematic diagram of a projection screen with a specific color temperature according to an embodiment of the present invention.

The above-mentioned other technical contents, features and effects of the present invention will be clearly presented in the detailed description of the preferred embodiment with reference to the following drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used are used for explanation and not for limiting the present invention.

In order to make the content of the present invention more understandable, the following embodiments are specifically cited as examples on which the present invention can be implemented. In addition, wherever possible, the elements/components/steps with the same labels in the drawings and embodiments represent the same or similar parts.

FIG1 is a circuit diagram of a projection system of an embodiment of the present invention. Referring to FIG1 , the projection system 100 includes a processor 110, a physiological characteristic sensing device 120, and a projection device 130. The processor 110 is coupled (electrically connected) to the physiological characteristic sensing device 120 and the projection device 130. The projection device 130 includes a controller 131, a projection module 132, and an audio player 133. The controller 131 is coupled to the projection module 132 and the audio player 133. In this embodiment, the physiological characteristic sensing device 120 can obtain physiological information 101 of a sensing target (e.g., a user). The physiological information 101 may include, for example, heartbeat information, respiratory information, and/or blood pressure information, etc., but the present invention is not limited thereto. The physiological characteristic sensing device 120 can output a corresponding physiological characteristic signal 102 to the processor 110 according to the physiological information 101, wherein the physiological characteristic signal 102 can include at least one of a heartbeat signal, a pulse signal, an eye movement signal, a breathing frequency signal, and a brain wave signal.

In this embodiment, the processor 110 can analyze the physiological characteristic signal 102 and output the corresponding control signal 103 to the controller 131 of the projection device 130. The processor 110 can analyze the physiological characteristic signal 102, or summarize the characteristic curve of the human body state within a specific period of time, and then determine whether the sensing target is currently in a general state, a state of preparing to fall asleep, a deep sleep state, or a state of preparing to wake up, and the processor 110 can control the projection device 130 to perform corresponding operations in response to the current state of the sensing target. The control signal 103 can be a control signal of a mode of preparing to fall asleep, a control signal of a deep sleep mode, or a control signal of a mode of preparing to wake up.

In this embodiment, for example, the sleep stage of the sensing target may include a sleep preparation stage, a deep sleep stage, and a wake-up preparation stage. Therefore, the processor 110 may determine the sleep stage of the sensing target according to the analysis result of the physiological characteristic signal 102 to determine the output of, for example, a sleep preparation mode control signal, a deep sleep mode control signal, or a wake-up preparation mode control signal to the controller 131 of the projection device 130, so that the controller 131 may control the projection device 130 to execute the sleep preparation mode, the deep sleep mode, or the wake-up preparation mode to perform the corresponding projection image adjustment and audio playback effect. The controller 131 may operate the projection module 132 and the audio player 133 according to the control signal 103.

In this embodiment, the processor 110 and the physiological characteristic sensing device 120 may be, for example, disposed in a portable electronic device, such as a smart phone, a smart watch, a smart bracelet or a smart clothing, and the present invention does not limit the type of portable electronic device. The portable electronic device may communicate wirelessly with the projection device 130. In this regard, the sensing target may carry/wear the portable electronic device so that the portable electronic device may automatically and instantly sense the physiological information of the sensing target, and transmit the corresponding control signal 103 to the projection device 130 in a wireless or wired transmission manner. Further, the projection device 130 has an application program that can read the control signal 103 so that the projection device 130 performs a corresponding operation. In one embodiment, the processor 110 and the physiological characteristic sensing device 120 may also be integrated in the projection device 130. The physiological characteristic sensing device 120 may sense the physiological information of the sensing target in a non-contact remote measurement manner. For example, the physiological characteristic sensing device 120 may be an image sensor. The physiological characteristic sensing device 120 may sense a plurality of continuous blood vessel images of the sensing target, and may analyze the changes of the plurality of continuous blood vessel images to output a corresponding heartbeat characteristic signal to the processor 110. In another embodiment, the processor 110 may be integrated in the controller 131 of the projection device 130, and the physiological characteristic sensing device 120 may be provided in a portable electronic device. In another embodiment, the physiological characteristic sensing device 120 may be disposed in a portable electronic device, and the processor 110 may be disposed in a host device (such as a computer host, a tablet, etc.). The portable electronic device communicates wirelessly with the host device, and the host device communicates wirelessly with the projection device 130.

In this embodiment, the processor 110 and the controller 131 may include a central processing unit (CPU) with relevant data computing functions and projection control functions, or other programmable general-purpose or special-purpose microprocessors, digital signal processors (DSP), image processors (IPU), graphics processors (GPU), programmable controllers, application-specific integrated circuits (ASIC), programmable logic devices (PLD), other similar control devices or a combination of these devices.

In this embodiment, the projection device 130 may further include a memory, wherein the memory may be, for example, a removable random access memory (RAM), a read-only memory (ROM), a flash memory or a similar element or a combination of the above elements. The memory may be used to store relevant projection image data, audio data, projection control program and audio playback program, etc., for the controller 131 to access and execute.

In this embodiment, the projection module 132 may include a projection light source, an optical engine, and an optical system. The projection light source may include a light emitting unit such as a discharge bulb, a light emitting diode, or a laser light source. The optical engine may include a reflective spatial light modulator or a transmissive spatial light modulator. The reflective spatial light modulator may, for example, include a reflective liquid crystal on silicon (LCOS) or a digital micro-mirror device (DMD). The transmissive spatial light modulator may, for example, include a transparent liquid crystal panel. The optical system may include a plurality of lenses, and the plurality of lenses may be arranged on the optical path of the projection light beam. In this embodiment, the audio player 133 may include a speaker.

In addition, in some embodiments of the present invention, the projection system 100 may not include the processor 110 and the physiological characteristic sensing device 120. In this regard, the projection device 130 may automatically execute the sleep preparation mode, deep sleep mode or wake-up preparation mode according to the preset time set by the user.

FIG. 2 is a flowchart of a projection method according to an embodiment of the present invention. Referring to FIG. 1 and FIG. 2, the projection system 100 may execute the following steps S210-S230 to perform automatic projection and audio playback operations. It should be noted that in some implementation scenarios of the present invention, only at least one of the following steps S210-S230 may be executed. In this embodiment, when the processor 110 determines that the current sleep stage of the sensing target is the preparation-to-sleep stage according to the physiological characteristic signal 102 provided by the physiological characteristic sensing device 120, the processor 110 may output a preparation-to-sleep mode control signal to the controller 131, so that the controller 131 executes the preparation-to-sleep mode. Alternatively, the controller 131 may execute the preparation-to-sleep mode according to a preset time set in advance. Alternatively, the projection device 130 may further include a light sensor. The light sensor is coupled to the controller 131. When it gets darker, the light sensor may provide an ambient light sensing signal to the controller 131 according to the decreasing ambient brightness, so that the controller 131 decides to execute the sleep preparation mode according to the ambient light sensing signal. Therefore. In step S210, when the controller 131 executes the sleep preparation mode, the projection device 130 may operate the projection module 132 through the controller 131 to dim the projection beam (reduce the intensity of the projection beam) or project a preset projection image, and operate the audio player 133 through the controller 131 to play a preset sound. In other words, when the heartbeat, breathing and/or brain wave activity of the sensing target decreases, the projection device 130 can automatically operate the projection module 132 to project a preset projection image that helps prepare for sleep, and operate the audio player 133 to play a preset audio that helps prepare for sleep. In addition, in some embodiments of the present invention, the projection module 132 also includes a fan. When the controller 131 executes the sleep preparation mode, the controller 131 can also increase the speed of the fan accordingly. The purpose of increasing the speed of the fan is to increase the noise of the fan. The noise of the fan is a relatively stable continuous noise that people are more accustomed to and ignore. This loud fan noise is used to cover other discontinuous noises that people are not accustomed to and ignore (such as objects falling from upstairs, sudden knocking sounds or dog barking, etc.), so that people are less likely to be frightened by these discontinuous noises and affect their sleep.

Next, when the processor 110 determines that the current sleep stage of the sensing target is a deep sleep stage according to the physiological characteristic signal 102 provided by the physiological characteristic sensing device 120, the processor 110 may output a deep sleep mode control signal to the controller 131 so that the controller 131 executes the deep sleep mode. Alternatively, the controller 131 may execute the deep sleep mode according to another preset time pre-set by the user. Therefore. In step S220, when the controller 131 executes the deep sleep mode, the projection device 130 may turn off the projection module 132 and the audio player 133 through the controller 131. In other words, when the heartbeat, breathing and/or brain wave activity of the sensing target is in a state corresponding to the deep sleep stage, the projection device 130 may automatically turn off the projection module 132 and the audio player 133.

Next, when the processor 110 determines that the current sleep stage of the sensing target is the preparation wake-up stage according to the physiological characteristic signal 102 provided by the physiological characteristic sensing device 120, the processor 110 can output a preparation wake-up mode control signal to the controller 131, so that the controller 131 executes the preparation wake-up mode. Alternatively, the controller 131 can execute the preparation wake-up mode according to another preset time set in advance. Alternatively, the projection device 130 may also include a light sensor. The light sensor is coupled to the controller 131. When the sky gradually brightens, the light sensor can provide an ambient light sensing signal to the controller 131 according to the increasing ambient brightness, so that the controller 131 decides to execute the preparation wake-up mode according to the ambient light sensing signal. Therefore. In step S230, when the controller 131 executes the preparation wake-up mode, the controller 131 operates the projection module 132 to brighten the projection beam (increase the intensity of the projection beam) or project another preset projection image, and the controller 131 operates the audio player 133 to play another preset sound in a gradually increasing volume. In other words, when the heartbeat, breathing and/or brain wave activity of the sensing target gradually increases to a state corresponding to the preparation wake-up stage, the projection device 130 can automatically turn on the projection module 132 and the audio player 133, and the controller 131 can operate the projection module 132 to brighten the projection beam or project another preset projection image, and operate the audio player 133 to play another preset sound in a gradually increasing volume. Therefore, the projection system 100 of this embodiment can provide adaptive audio and video playback functions according to the sleep stage of the sensing target. In addition, in some embodiments of the present invention, when the controller 131 executes the preparation wake-up mode, the controller 131 can also increase the fan speed of the projection module 132 accordingly.

In this embodiment, the above-mentioned preset sound may be white noise, pink noise or sleep-aiding music, and the audio data of white noise, pink noise or sleep-aiding music may be pre-stored in the projection device 130 or provided by an electronic device (such as the above-mentioned portable electronic device), wherein the electronic device communicates wirelessly with the projection device 130. With reference to FIG. 3A, FIG. 3A is a schematic diagram of an approximate power spectrum of white noise of an embodiment of the present invention. The audio player 133 of this embodiment may continuously play white noise with an approximate power spectrum as shown in FIG. 3A. Alternatively, with reference to FIG. 3B, FIG. 3B is a schematic diagram of an approximate power spectrum of pink noise of an embodiment of the present invention. The audio player 133 of this embodiment may also continuously play pink noise with an approximate power spectrum as shown in FIG. 3B.

In some embodiments of the present invention, with reference to FIGS. 4A to 4F, FIGS. 4A to 4F are schematic diagrams of the first to sixth projection images of an embodiment of the present invention. For example, the audio player 133 can play forest environment sounds or forest background music, and the projection module 132 can project a preset projection image 410 as shown in FIG. 4A, wherein the preset projection image 410 includes a forest image 411. The audio player 133 can play ocean environment sounds or ocean background music, and the projection module 132 can project a preset projection image 420 as shown in FIG. 4B, wherein the preset projection image 420 includes an ocean image 421. The audio player 133 can play rural environment sounds or rural background music, and the projection module 132 can project a preset projection image 430 as shown in FIG. 4C, wherein the preset projection image 430 includes a rural image 431. The audio player 133 can play the rainy environment sound or the rainy background music, and the projection module 132 can project the default projection screen 440 as shown in FIG. 4D, wherein the default projection screen 440 includes the rainy background image 441. The audio player 133 can play the river environment sound or the river background music, and the projection module 132 can project the default projection screen 450 as shown in FIG. 4E, wherein the default projection screen 450 includes the river background image 451. The audio player 133 can play the underwater environment sound or the underwater background music, and the projection module 132 can project the default projection screen 460 as shown in FIG. 4F, wherein the default projection screen 460 includes the underwater background image 461. The default projection screens 410-460 can be low-brightness projection screens. In addition, the audio player 133 can also automatically generate and play at least one of the forest environment sound, ocean environment sound, rural environment sound, rain environment sound, river environment sound, and seabed environment sound according to the play list set by the user or according to the user's historical preferences, and the projection module 132 can also automatically play at least one of the preset projection images 410~460.

In other embodiments of the present invention, with reference to FIG. 5A and FIG. 5B, FIG. 5A is a schematic diagram of a projection screen with a specific wavelength of an embodiment of the present invention, and FIG. 5B is a schematic diagram of a projection screen with a specific color temperature of an embodiment of the present invention. For example, the projection module 132 can automatically play a preset projection screen 510 with a specific wavelength as shown in FIG. 5A. The projection image 511 of the preset projection screen 510 can be, for example, an image content mainly composed of green light, such as an aurora image, to provide soft light. Or it can be a preset projection screen 520 with a specific color temperature as shown in FIG. 5B. The projection image 521 of the preset projection screen 520 can be, for example, an image content mainly composed of low-brightness warm-colored light, such as a light bar changing image, to provide low-irritation light. In other words, the projection system 100 can automatically create a projection scenario that helps the sensing target enter the sleep preparation stage or deep sleep stage.

In addition, the above-mentioned sensing target is not limited to one. In some embodiments of the present invention, the projection system 100 may also include another physiological characteristic sensing device. Another physiological characteristic sensing device can be used to obtain another physiological information to generate another physiological characteristic signal. The processor 110 can analyze another physiological characteristic signal, and output a ready-to-sleep mode control signal, a deep sleep mode control signal, or a ready-to-wake-up mode control signal to the projection device 130 based on the above-mentioned physiological characteristic signal and the other physiological characteristic signal. In other words, the projection system 100 can comprehensively evaluate the status of multiple sensing targets to control the projection device 130 to perform corresponding projection and audio playback.

In addition, in some embodiments of the present invention, the processor 110 can also output a warning signal to the projection device 130 based on whether the physiological characteristic signal is abnormal, so that the projection device 130 operates at least one of the projection module 132 and the audio player 133 to play the warning information. In other words, since the physiological characteristic sensing device 120 continuously senses the physiological information of the sensing target, it can be applied to health and personal safety monitoring. For example, due to the fire smoke or gas leakage, the heartbeat and/or breathing rate of the sensing target is too low or too high. In this regard, the processor 110 can also determine whether to issue a warning through the projection device 130 based on whether the physiological characteristic signal is higher than the first preset value or lower than the second preset value.

In an implementation scenario of the present invention, the above-mentioned multiple modes can be further divided into multiple operation modes, but are not limited to the above. For example, before the sensing target falls asleep, when the processor 110 determines that the time has reached a first preset time (or according to the sleeping habits of the sensing target), the processor 110 can provide a corresponding first control signal to the controller 131, so that the controller 131 can operate the projection module 132 to project a preset projection image to remind the sensing target to prepare for sleep. Next, when the sensing target is about to fall asleep, when the processor 110 determines that the time has reached the second preset time (or according to the sleeping habits of the sensing target), the processor 110 may provide a corresponding second control signal to the controller 131, so that the controller 131 can operate the projection module 132 to project the preset projection image, and operate the audio player 133 to play white noise, pink noise or preset sound. Alternatively, the controller 131 can adjust the fan speed of the projection module 132 from the first speed to the second speed. Next, when the sensing target is about to fall asleep, when the processor 110 determines that the time has reached the third preset time (or according to the sleeping habits of the sensing target), the processor 110 may provide a corresponding third control signal to the controller 131, so that the controller 131 can dim the projection brightness of the projection module 132. Alternatively, the controller 131 may adjust the volume of the white noise or pink noise from the first volume to the second volume.

Next, when the sensing target is in a light sleep period, when the processor 110 determines that the time has reached a fourth preset time (or based on the sleeping habits of the sensing target), the processor 110 can provide a corresponding fourth control signal to the controller 131, so that the controller 131 can simultaneously or non-simultaneously dim the projection brightness of the projection module 132 and reduce the volume of the white noise, pink noise or preset sound played by the audio player 133. Among them, the periods of falling asleep, falling asleep, and light sleep mentioned in the above paragraphs are all controlled by the processor 110 to control the projection device 130 to dim the projection beam (reduce the intensity of the projection beam), project a preset projection image, or adjust the volume of the preset sound played by the audio player 133, etc. Different operation modes, the periods of falling asleep, falling asleep, and light sleep all correspond to the stage of the sensing target preparing to fall asleep. Then, during the deep sleep stage of the sensing target, when the processor 110 determines that the time has reached the fifth preset time (or according to the sleeping habits of the sensing target), the processor 110 can provide a corresponding fifth control signal to the controller 131, so that the controller 131 can turn off the projection module 132 and the audio player 133. Finally, when the sensing target is in the stage of preparing to wake up, when the processor 110 determines that the time has reached the sixth preset time (or according to the sleeping habits of the sensing target), the processor 110 can provide a corresponding sixth control signal to the controller 131, so that the controller 131 can turn on the projection module 132 and the audio player 133 simultaneously or non-simultaneously.

In summary, the projection system and projection method of the present invention can continuously sense the physiological characteristic information of the sensing target, and can automatically adjust the projection beam or projection image according to the changes in the physiological characteristic information of the sensing target. The projection system and projection method of the present invention can automatically create an audio-visual situation that helps the sensing target prepare for sleep and/or sleep by projecting a preset projection image and/or playing a preset audio, and can gradually maintain the sleep quality of the sensing target. Moreover, the projection system and projection method of the present invention can also automatically wake up the sensing target. In addition, the projection system and projection method of the present invention can also monitor the physiological characteristic information of the sensing target to provide a practical warning function.

However, the above is only the preferred embodiment of the present invention, and it cannot be used to limit the scope of the implementation of the present invention. That is, all simple equivalent changes and modifications made according to the scope of the patent application and the content of the invention description of the present invention are still within the scope of the present invention. In addition, any embodiment or patent application scope of the present invention does not need to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract part and the title are only used to assist the search of patent documents, and are not used to limit the scope of rights of the present invention.

In addition, the terms "first" and "second" mentioned in this specification or patent application are only used to name the element or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.

S210, S220, S230: Steps

Claims (30)

A projection system includes: a projection device, including: a projection module; a controller coupled to the projection module; and an audio player coupled to the controller, wherein the controller is used to execute a sleep preparation mode, the sleep preparation mode includes an operation mode corresponding to a sleep period and an operation mode corresponding to a light sleep period, the light sleep period is after the sleep period, when the controller executes the operation mode corresponding to the sleep period, the controller operates the projection module to dim a projection beam or project a preset projection image with low brightness, and increases a volume of a preset sound played by the audio player, when the controller executes the operation mode corresponding to the light sleep period, the controller operates the projection module to dim the projection beam, and decreases the volume of the preset sound played by the audio player. A projection system as described in claim 1, wherein when the controller executes a deep sleep mode, the controller turns off the projection module and the audio player. A projection system as described in claim 2, wherein when the controller executes a preparation wake-up mode, the controller operates the projection module to brighten the projection beam or project another preset projection image, and operates the audio player to play another preset sound in a gradually increasing volume manner. The projection system as described in claim 3 further includes: a physiological characteristic sensing device for obtaining a physiological characteristic signal; and a processor coupled to the physiological characteristic sensing device and used to analyze the physiological characteristic signal, wherein the processor outputs one of a ready-to-sleep mode control signal, a deep sleep mode control signal and a ready-to-wake-up mode control signal to the projection device according to the physiological characteristic signal, so that the controller executes one of the ready-to-sleep mode, the deep sleep mode and the ready-to-wake-up mode according to one of the ready-to-sleep mode control signal, the deep sleep mode control signal and the ready-to-wake-up mode control signal. A projection system as described in claim 4, wherein the physiological characteristic sensing device and the processor are disposed in a portable electronic device, and the portable electronic device communicates wirelessly with the projection device. A projection system as described in claim 4, wherein the physiological characteristic sensing device is disposed in a portable electronic device, and the controller includes the processor, wherein the portable electronic device communicates wirelessly with the projection device. A projection system as described in claim 4, wherein the physiological characteristic sensing device is disposed in a portable electronic device, and the processor is disposed in a host device, wherein the portable electronic device communicates wirelessly with the host device, and the host device communicates wirelessly with the projection device. A projection system as described in claim 4, wherein the physiological characteristic signal includes at least one of a heartbeat signal, a pulse signal, an eye movement signal, a breathing frequency signal, and a brain wave signal. A projection system as described in claim 4, wherein the projection system further comprises: another physiological characteristic sensing device for obtaining another physiological information to generate another physiological characteristic signal, wherein the processor analyzes the other physiological characteristic signal, wherein the processor outputs one of another ready-to-sleep mode control signal, another deep sleep mode control signal and another ready-to-wake-up mode control signal to the projection device according to the physiological characteristic signal and the other physiological characteristic signal. The projection system as described in claim 4, wherein the processor further outputs a warning signal to the projection device according to whether the physiological characteristic signal is abnormal, so that the projection device operates at least one of the projection module and the audio player to play the warning information. A projection system as described in claim 3, wherein the controller executes the sleep preparation mode, the deep sleep mode and the wake-up preparation mode respectively according to three preset times. A projection system as described in claim 3, wherein the projection device further comprises: a light sensor coupled to the controller and used to provide an ambient light sensing signal, wherein the controller selects to execute the ready-to-sleep mode or the ready-to-wake-up mode according to the ambient light sensing signal. A projection system as described in claim 3, wherein when the controller executes the sleep mode or the wake-up mode, the controller adjusts the rotation speed of a fan of the projection module. A projection system as described in claim 1, wherein the preset sound is a white noise, a pink noise or a sleep-aiding music, wherein an audio data of the white noise, the pink noise or the sleep-aiding music is pre-stored in the projection device or provided by an electronic device, wherein the electronic device communicates wirelessly with the projection device. A projection system as described in claim 1, wherein the preset projection screen has at least one of a specific wavelength and a specific color temperature. A projection method is used in a projection system, wherein the projection system includes a projection device, and the projection device includes a projection module, a controller and an audio player, wherein the projection method includes: executing a sleep preparation mode by the controller, the sleep preparation mode includes an operation mode corresponding to a sleep period and an operation mode corresponding to a light sleep period, the light sleep period is after the sleep period; when the controller executes the operation mode corresponding to the sleep period When the controller executes the operation mode corresponding to the sleep period, the controller operates the projection module to dim the projection beam or project a preset projection image with low brightness, and the controller increases the volume of a preset sound played by the audio player; and when the controller executes the operation mode corresponding to the sleep period, the controller operates the projection module to dim the projection beam, and the controller decreases the volume of the preset sound played by the audio player. The projection method as described in claim 16 further includes: When the controller executes a deep sleep mode, the controller turns off the projection module and the audio player. The projection method as described in claim 17 further includes: when the controller executes a preparation wake-up mode, the controller operates the projection module to brighten the projection beam or project another preset projection image; and the controller operates the audio player to play another preset sound in a gradually increasing volume manner. The projection method as described in claim 18, wherein the projection system further includes a physiological characteristic sensing device and a processor, and the projection method further includes: obtaining a physiological characteristic signal by the physiological characteristic sensing device; analyzing the physiological characteristic signal by the processor; outputting one of a ready-to-sleep mode control signal, a deep sleep mode control signal and a ready-to-wake-up mode control signal to the projection device by the processor according to the physiological characteristic signal; and executing the ready-to-sleep mode, the deep sleep mode or the ready-to-wake-up mode by the controller according to the ready-to-sleep mode control signal, the deep sleep mode control signal or the ready-to-wake-up mode control signal. As described in claim 19, the physiological characteristic sensing device and the processor are disposed in a portable electronic device, and the portable electronic device communicates wirelessly with the projection device. The projection method as described in claim 19, wherein the physiological characteristic sensing device is disposed in a portable electronic device, and the controller includes the processor, wherein the portable electronic device communicates wirelessly with the projection device. The projection method as described in claim 19, wherein the physiological characteristic sensing device is disposed in a portable electronic device, and the processor is disposed in a host device, wherein the portable electronic device communicates wirelessly with the host device, and the host device communicates wirelessly with the projection device. The projection method as described in claim 19, wherein the physiological characteristic signal includes at least one of a heartbeat signal, a pulse signal, an eye movement signal, a breathing frequency signal, and a brain wave signal. The projection method as described in claim 19, wherein the projection system further includes another physiological characteristic sensing device, and the projection method further includes: obtaining another physiological information by the other physiological characteristic sensing device to generate another physiological characteristic signal; analyzing the other physiological characteristic signal by the processor; and outputting one of another ready-to-sleep mode control signal, another deep sleep mode control signal and another ready-to-wake-up mode control signal to the projection device by the processor according to the physiological characteristic signal and the other physiological characteristic signal. The projection method as described in claim 18 further includes: the processor also outputs a warning signal to the projection device according to whether the physiological characteristic signal is abnormal, so that the projection device operates at least one of the projection module and the audio player to play the warning information. The projection method as described in claim 18, wherein the controller executes the sleep preparation mode, the deep sleep mode and the wake-up preparation mode respectively according to three preset times. The projection method as described in claim 18, wherein the projection device further includes a light sensor, wherein the light sensor provides an ambient light sensing signal, so that the controller selects to execute the ready-to-sleep mode or the ready-to-wake-up mode according to the ambient light sensing signal. The projection method as described in claim 18 further includes: when the controller executes the sleep preparation mode or the wake-up preparation mode, the controller adjusts the rotation speed of a fan of the projection module. The projection method as described in claim 16, wherein the preset sound is a white noise, a pink noise or a sleep-aiding music, wherein an audio data of the white noise, the pink noise or the sleep-aiding music is pre-stored in the projection device or provided by an electronic device, wherein the electronic device communicates wirelessly with the projection device. A projection method as described in claim 16, wherein the preset projection screen has at least one of a specific wavelength and a specific color temperature.

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