Light emitting device, operation device and synchronization method

Abstract

The invention provides a light-emitting device, an operation device and a synchronization method. The light-emitting device comprises a light-emitting element, a control circuit and a photosensitive circuit. The light-emitting element provides a light ray. The control circuit is coupled to the light-emitting element for controlling the light. The photosensitive circuit detects an external light. The control circuit adjusts the light during a synchronization period so that the light has synchronization information.

Description

Technical Field

[0001] The present invention relates to a light-emitting device, and more particularly to a light-emitting device that generates light with synchronization information. Background Art

[0002] With the progress of technology, the types and functions of electronic devices are increasing. To enhance the visual experience, many components inside electronic devices have the function of emitting light. However, since the components operate independently of each other, the light generated by each component may be different from the light generated by another component. Summary of the Invention

[0003] An embodiment of the present invention provides a light-emitting device, including a light-emitting element, a control circuit, and a photosensitive circuit. The light-emitting element provides a first light. The control circuit is coupled to the light-emitting element for controlling the first light. The photosensitive circuit detects a second light. During a synchronization period, the control circuit adjusts the first light such that the first light has synchronization information.

[0004] The present invention further provides an operating device, including a first light-emitting device and a second light-emitting device. The first light-emitting device includes a first light-emitting element and a first control circuit. The first light-emitting element is configured to provide a first light. The first control circuit is coupled to the first light-emitting element for controlling the first light. The second light-emitting device includes a second light-emitting element, a photosensitive circuit, and a second control circuit. The second light-emitting element generates a second light. The photosensitive circuit detects the first light to generate a detection signal. The second control circuit adjusts the time point at which the second light-emitting element generates the second light according to the detection signal.

[0005] The present invention further provides a synchronization method applicable to an operating device, which includes a first light-emitting element and a second light-emitting element. The synchronization method of the present invention includes driving the first light-emitting element to emit a light, determining whether a specified event occurs, setting the light to have synchronization information when the specified event occurs, determining whether the light has synchronization information, and controlling the second light-emitting element when the light has the synchronization information.

[0006] The synchronization method of the present invention can be implemented by the light-emitting device of the present invention, which is hardware or firmware capable of executing specified functions, or can be incorporated in a recording medium in the form of program code and implemented in combination with specified hardware. When the program code is loaded and executed by an electronic device, a processor, a computer, or a machine, the electronic device, the processor, the computer, or the machine becomes a light-emitting device for implementing the present invention. Description of the Drawings

[0007] Figure 1 It is a schematic diagram of the operating device of the present invention.

[0008] Figure 2A Schematic diagram of the synchronization information of the present invention.

[0009] Figure 2B Another schematic diagram of the synchronization information of the present invention.

[0010] Figure 2C Another schematic diagram of the synchronization information of the present invention.

[0011] Figure 3A Another schematic diagram of the operating device of the present invention.

[0012] Figure 3B Another schematic diagram of the operating device of the present invention.

[0013] Figure 4 Schematic diagram of the light-emitting device of the present invention.

[0014] Figure 5 Flow schematic diagram of the synchronization method of the present invention.

[0015] Reference numerals:

[0016] 100, 300A, 300B: Operating device

[0017] 110, 120, 310, 320A, 330A, 340A, 320B, 330B, 340B: Device

[0018] 111, 121, 311, 321A, 331A, 341A, 321B, 331B, 341B: Light-emitting device

[0019] 112, 122, 312, 322, 332, 342: Electronic device

[0020] 114, 124, 410: Light-emitting element

[0021] LL_1, LL_2, LL_2A, LL_3A, LL_4A, LL_2B, LL_3B, LL_4B, LIN, LOUT: Light ray

[0022] 123, 430: Photosensitive circuit

[0023] 130, 140: Slot

[0024] 211, 213, 221, 223, 231, 233: Light-emitting period

[0025] 212, 222, 232: Synchronization period

[0026] 420: Control circuit

[0027] 421: Logic circuit

[0028] 422: Counter

[0029] 440: Oscillation circuit

[0030] CLK: Clock signal

[0031] S1: Detection signal

[0032] S2: Drive signal

[0033] S511~S159: Steps Detailed implementation manners

[0034] To make the objectives, features, and advantages of the present invention more obvious and understandable, embodiments are specifically given below and detailed descriptions are made in conjunction with the accompanying drawings. The specification of the present invention provides different embodiments to illustrate the technical features of different implementation manners of the present invention. Among them, the configurations of the components in the embodiments are for illustrative purposes and are not intended to limit the present invention. In addition, some of the reference numerals in the embodiments are repeated. For the sake of simplifying the description, it does not mean the relevance between different embodiments.

[0035] Figure 1 It is a schematic diagram of the operating device of the present invention. As shown in the figure, the operating device 100 includes devices 110 and 120. In this embodiment, devices 110 and 120 are two independent devices. The present invention does not limit the type of the operating device 100. In a possible embodiment, the operating device 100 is a main board. In this example, devices 110 and 120 are any devices installed on the main board. In this embodiment, device 110 includes a light-emitting device 111 and an electronic device 112, and device 120 includes a light-emitting device 121 and an electronic device 122.

[0036] The light-emitting device 111 has a light-emitting element 114 for providing a light ray LL_1. The light ray LL_1 may sequentially present different colors. For example, the color sequence of the light ray LL_1 may be red -> green -> red -> green -> red -> green. In a possible embodiment, the light-emitting device 111 is disposed above the electronic device 112. The present invention does not limit the connection relationship between the light-emitting device 111 and the electronic device 112. In a possible embodiment, the light-emitting device 111 is attached above the electronic device 112.

[0037] The light-emitting device 121 at least has a photosensitive circuit 123 and a light-emitting element 124. The photosensitive circuit 123 detects the light LL_1. The light-emitting element 124 provides a light LL_2 according to the detection result of the photosensitive circuit 123. In a possible embodiment, the color presented by the light LL_2 is the same as the color presented by the light LL_1. For example, the color sequence of the light LL_2 may be red -> green -> red -> green -> red -> green. In this embodiment, the light-emitting device 121 is disposed on the electronic device 122. The present invention does not limit the connection relationship between the light-emitting device 121 and the electronic device 122. In a possible embodiment, the light-emitting device 121 is attached to the electronic device 122.

[0038] In some embodiments, the operating device 100 further includes slots 130 and 140. The slot 130 is used for inserting the electronic device 112. The slot 140 is used for inserting the electronic device 122. The present invention does not limit the types of the electronic devices 112 and 122. In a possible embodiment, the types of the electronic devices 112 and 122 are the same, such as both being memories, such as Dual In-line Memory Module (DIMM). In other embodiments, the electronic devices 112 and 122 may each have at least one Double Data Rate (DDR) memory. In another possible embodiment, the types of the electronic devices 112 and 122 are different.

[0039] Since the light-emitting devices 111 and 121 are two independent elements and are independent of each other, the color changes of the lights LL_1 and LL_2 may not be synchronized. For example, when the light LL_1 presents red, the light LL_2 should also present red. When the light LL_1 presents green, the light LL_2 should also present green. However, when the colors presented by the lights LL_1 and LL_2 are not synchronized, when the light LL_1 presents red, the light LL_2 may present green. When the light LL_1 presents green, the light LL_2 presents red.

[0040] Therefore, the light-emitting device 111 adjusts the light LL_1 at regular intervals so that the light LL_1 contains a synchronization information. In a possible embodiment, the synchronization information is a visible light or a non-visible light. The light-emitting device 121 modifies the time point of generating the light LL_2 according to the synchronization information of the light LL_1 so that the color presented by the light LL_2 is synchronized with the color presented by the light LL_1. In other embodiments, the light-emitting device 121 adjusts the color of the light LL_2 according to the synchronization information of the light LL_1.

[0041] The present invention does not limit how the light emitting device 111 adds synchronization information to the light beam LL_1. In a possible embodiment, the light emitting device 111 adjusts the time length of the light beam LL_1 emitted by the light emitting element 114. For example, during a light emitting period, the time length for the light emitting element 114 to provide the light beam LL_1 is maintained at a first preset value, and during a synchronization period, the time length for the light emitting element 114 to provide the light beam LL_1 is a second preset value. The first preset value may be greater than or less than the second preset value. In this example, when the light emitting device 121 detects that the time length of the light beam LL_1 is the second preset value, the light emitting device 121 adjusts the time point for emitting the light beam LL_2.

[0042] Figure 2A It is a schematic diagram of the synchronization information of the present invention. During the light emitting periods 211 and 213, the duty cycle of the light emitting element 114 of the light emitting device 111 is 20%, and during the synchronization period 212, the duty cycle of the light emitting element 114 of the light emitting device 111 is 40%. Therefore, the time length for the light emitting element 114 to provide the light beam LL_1 during the synchronization period 212 is greater than the time length for providing the light beam LL_1 during the light emitting periods 211 and 213. In this example, the light beam LL_1 generated by the light emitting element 114 during the synchronization period 212 serves as a synchronization information.

[0043] In other embodiments, during the synchronization period 212, the duty cycle of the light emitting element 114 may be less than the duty cycles during the light emitting periods 211 and 213. For example, during the light emitting periods 211 and 213, the duty cycle of the light emitting element 114 may be 40%, and during the synchronization period 212, the duty cycle of the light emitting element 114 may be 10%. By adjusting the duty cycle of the light emitting element 114 of the light emitting device 111, the light beam LL_1 can carry a special information (i.e., synchronization information).

[0044] In another possible embodiment, the light emitting device 111 adjusts the intensity of the light beam LL_1 to add a synchronization information to the light beam LL_1. For example, during a light emitting period, the intensity of the light beam LL_1 is a third preset value, and during a synchronization period, the intensity of the light beam LL_1 is a fourth preset value. The third preset value may be greater than or less than the fourth preset value. In this example, when the light emitting device 121 detects that the intensity of the light beam LL_1 is the fourth preset value, the light emitting device 121 adjusts the time point for emitting the light beam LL_2.

[0045] Figure 2BAnother schematic diagram of the synchronization information of the present invention. In this embodiment, the light emitting device 111 adjusts the intensity of the light beam LL_1 such that the light beam LL_1 contains synchronization information. For example, during the light emitting periods 221 and 223, the intensity of the light beam LL_1 is a third preset value. During the synchronization period 222, the intensity of the light beam LL_1 is a fourth preset value. In this embodiment, the third preset value is greater than the fourth preset value, but this is not intended to limit the present invention. In other embodiments, during the synchronization period 222, the intensity of the light beam LL_1 may be greater than the intensities during the light emitting periods 221 and 223.

[0046] In other embodiments, the light emitting device 111 inserts the synchronization information into the light beam LL_1. When the light emitting device 121 detects the synchronization information in the light beam LL_1, the light emitting device 121 adjusts the time point of emitting the light beam LL_2. Figure 2C Another schematic diagram of the synchronization information of the present invention. In this embodiment, the light emitting device 111 inserts the synchronization information into the light beam LL_1.

[0047] As shown in the figure, during the light emitting period 231, the light beam LL_1 appears red. During the synchronization period 232, the light emitting device 111 inserts the synchronization information into the light beam LL_1. At this time, the light beam LL_1 may be an invisible light. During the light emitting period 233, the light beam LL_1 appears green.

[0048] Since the light beam LL_1 has synchronization information, when the light emitting device 121 adjusts the light beam LL_2 emitted by itself according to the synchronization information, the color presented by the light beam LL_2 can be synchronized with the color presented by the light beam LL_1. In a possible embodiment, the light emitting device 111 inserts the synchronization information into the light beam LL_1 at regular intervals.

[0049] Figure 3A Another schematic diagram of the operating device of the present invention. As shown in the figure, the operating system 300A includes devices 310, 320A, 330A, 340A, but this is not intended to limit the present invention. In other embodiments, the operating system 300A has more or fewer devices. The devices 310, 320A, 330A, 340A operate independently.

[0050] The device 310 includes a light emitting device 311 and an electronic device 312. The light emitting device 311 adjusts the light beam LL_1 at regular intervals such that the light beam LL_1 has synchronization information. In this embodiment, the characteristics of the light emitting device 311 and the electronic device 312 are the same as Figure 1 those of the light emitting device 111 and the electronic device 112, so they will not be described in detail.

[0051] Device 320A includes a light-emitting device 321A and an electronic device 322. The light-emitting device 321A is disposed on the electronic device 312 and provides a light ray LL_2A according to the synchronization information of the light ray LL_1. Device 330A includes a light-emitting device 331A and an electronic device 332. The light-emitting device 331A is disposed on the electronic device 332 and provides a light ray LL_3A according to the synchronization information of the light ray LL_1. Device 340A includes a light-emitting device 341A and an electronic device 342. The light-emitting device 341A is disposed on the electronic device 342 and provides a light ray LL_4A according to the synchronization information of the light ray LL_1.

[0052] In this embodiment, the characteristics of the light-emitting devices 321A, 331A, and 341A are similar to Figure 1 those of the light-emitting device 121, so they will not be elaborated here. Additionally, the characteristics of the electronic devices 322, 332, and 342 are similar to Figure 1 those of the electronic device 122, so they will not be elaborated either. Furthermore, since the light-emitting devices 321A, 331A, and 341A adjust the light rays LL_2A, LL_3A, and LL_4A according to the synchronization information of the light ray LL_1, the color sequences of the light rays LL_2A, LL_3A, and LL_4A are synchronized with the color sequence of the light ray LL_1.

[0053] Figure 3B This is another schematic diagram of the operating device of the present invention. As shown in the figure, the operating system 300B includes devices 310, 320B, 330B, and 340B, but this is not intended to limit the present invention. In other embodiments, the operating system 300B may have more or fewer devices. Since the characteristics of the device 310 are similar to Figure 1 those of the device 110, they will not be elaborated here. In this embodiment, the light ray LL_1 emitted by the device 310 has a first synchronization information.

[0054] Device 320B includes a light-emitting device 321B and an electronic device 322. The light-emitting device 321B is disposed on the electronic device 312 and provides a light ray LL_2B according to the first synchronization information of the light ray LL_1. In this embodiment, the color presented by the light ray LL_2B is synchronized with the color presented by the light ray LL_1. In other embodiments, the light ray LL_2B has a second synchronization information. Since the characteristics of the light-emitting device 321B are similar to Figure 1 those of the light-emitting device 121, they will not be elaborated here.

[0055] Device 330B includes a light-emitting device 331B and an electronic device 332. The light-emitting device 331B is disposed on the electronic device 332 and provides a light beam LL_3B according to the second synchronization information of the light beam LL_2B. In this embodiment, the color presented by the light beam LL_3B is synchronized with the color presented by the light beam LL_2B. In other embodiments, the light beam LL_3B has a third synchronization information. Since the characteristics of the light-emitting device 331B are similar to those of Figure 1 the light-emitting device 121, they will not be elaborated herein.

[0056] Device 340B includes a light-emitting device 341B and an electronic device 342. The light-emitting device 341B is disposed on the electronic device 342 and provides a light beam LL_4B according to the synchronization information of the light beam LL_3B. In this embodiment, the color presented by the light beam LL_4B is synchronized with the color presented by the light beam LL_3B. In other embodiments, the light beam LL_4B has a fourth synchronization information for controlling a backend device (not shown). Since the characteristics of the light-emitting device 341B are similar to those of Figure 1 the light-emitting device 121, they will not be elaborated herein.

[0057] Figure 4 is a schematic diagram of the light-emitting device of the present invention. As shown in the figure, the light-emitting device 400 includes a light-emitting element 410, a control circuit 420, and a photosensitive circuit 430. The light-emitting element 410 generates a light beam LOUT according to a driving signal S2. In a possible embodiment, the light-emitting element 410 controls the brightness, color, and illumination time of the light beam LOUT according to the driving signal S2. The present invention does not limit the architecture of the light-emitting element 410. In a possible embodiment, the light-emitting element 410 includes a plurality of light-emitting diodes (LEDs).

[0058] The control circuit 420 is coupled to the light-emitting element 410 for controlling the light beam LOUT. In a possible embodiment, the control circuit 420 adjusts the time length for which the light-emitting element 410 provides the light beam LOUT. For example, during a light-emitting period, the control circuit 420 sets the time length for which the light-emitting element 410 provides the light beam LOUT to a first preset value, and during a synchronization period, the control circuit 420 sets the time length for which the light-emitting element 410 provides the light beam LOUT to a second preset value. The second preset value may be greater than or less than the first preset value.

[0059] In another possible embodiment, the control circuit 420 adjusts a physical property of the light beam LOUT, such as intensity. For example, during a light-emitting period, the control circuit 420 sets the physical property of the light beam LOUT to a third preset value. During a synchronization period, the control circuit 420 sets the physical property of the light beam LOUT to a fourth preset value. The third preset value may be greater than or less than the fourth preset value.

[0060] In other embodiments, during a light-emitting period, the control circuit 420 turns on the light-emitting element 410 through the drive signal S2. During a synchronization period, the control circuit 420 sets the drive signal S2 to a specified state so that the light LOUT has a synchronization message. The synchronization message may be an invisible light.

[0061] The present invention does not limit the architecture of the control circuit 420. In a possible embodiment, the control circuit 420 is a microcontroller (MCU) or a microprocessor (MPU). In this embodiment, the control circuit 420 includes a logic circuit 421 and a counter 422.

[0062] The logic circuit 421 adjusts the drive signal S2 according to the count value of the counter 422, and then controls the physical characteristics of the light LOUT, such as intensity, color, and duration. For example, when the count value of the counter 422 falls within a first interval (such as values 0 to 49), the logic circuit 421 sets the drive signal S2 to a first state so that the light LOUT appears red. When the count value of the counter 422 falls within a second interval (such as values 50 to 99), the logic circuit 421 sets the drive signal S2 to a second state so that the light LOUT appears green. When the count value of the counter 422 falls within a third interval (such as values 100 to 149), the logic circuit 421 sets the drive signal S2 to the first state so that the light LOUT appears red. When the count value of the counter 422 falls within a fourth interval (such as values 150 to 199), the logic circuit 421 sets the drive signal S2 to the second state so that the light LOUT appears green.

[0063] In some embodiments, when the count value of the counter 422 reaches a first preset value (such as value 1000), the logic circuit 421 sets the drive signal S2 to a specified state. The light-emitting element 410 adds a synchronization message to the light LOUT according to the drive signal S2. Then, the logic circuit 421 may reset the counter 422 so that the count value of the counter 422 returns to an initial value (such as value 0). Then, the logic circuit 421 triggers the counter 422 again so that the counter 422 resumes the counting operation.

[0064] In a possible embodiment, the counter 422 counts the number of pulses of a clock signal CLK and provides the counting result to the logic circuit 421. The present invention does not limit the source of the clock signal CLK. The clock signal CLK may be provided by an oscillation circuit 440. The oscillation circuit 440 may be independent of the control circuit 420 or integrated into the control circuit 420.

[0065] In some embodiments, different light-emitting devices use different oscillation circuits. Figure 1For example, the oscillation circuit used by the light-emitting device 111 is different from the oscillation circuit used by the light-emitting device 121. Even though the oscillation circuits of the light-emitting devices 111 and 121 generate clock signals of the same frequency, there are slight differences between each oscillation circuit. As the usage time becomes longer, the clock signals generated by the two oscillation circuits gradually become out of sync, and as a result, the light rays LL_1 and LL_2 generated by the light-emitting devices 111 and 121 are no longer in sync. Therefore, the light-emitting device 111 loads a synchronization message into the light ray LL_1 at regular intervals. The light-emitting device 121 updates the time point for emitting the light ray LL_2 based on the synchronization message of the light ray LL_1, so that the light ray LL_2 is synchronized with the light ray LL_1. For example, the color presented by the light ray LL_2 is the same as the color presented by the light ray LL_1.

[0066] The photosensitive circuit 430 detects a light ray LIN to generate a detection signal S1. In a possible embodiment, the light ray LIN is Figure 1 the light ray LL_1. The control circuit 420 determines whether the light ray LIN has a synchronization message based on the detection signal S1. When the light ray LIN has a synchronization message, the control circuit 420 adjusts the time point for the light-emitting element 410 to generate the light ray LOUT, such as emitting the light ray LOUT earlier or delaying the emission of the light ray LOUT. The light ray LOUT at this time can be used as Figure 1 the light ray LL_2.

[0067] In a possible embodiment, the control circuit 420 enables or disables the photosensitive circuit 430 according to an external signal. When the photosensitive circuit 430 is disabled, it means that a light detection function is turned off. Therefore, the control circuit 420 sets the light ray LOUT to have a synchronization message at regular intervals. In this example, the light-emitting device 400 can be used as Figure 1 the light-emitting device 111, Figure 3A or Figure 3B the light-emitting device 311.

[0068] When the photosensitive circuit 430 is enabled, it means that a light detection function is turned on. In a possible embodiment, the control circuit 420 may stop loading the synchronization message into the light ray LOUT. In this example, the light-emitting device 400 may be used as Figure 1 the light-emitting device 121 or Figure 3A the light-emitting devices 321A, 331A or 341A. In another possible embodiment, when the light detection function is turned on, the control circuit 420 determines whether the light ray LIN has a first synchronization message through the detection signal S1. When the light ray LIN has a first synchronization message, the control circuit 420 may load a second synchronization message into the light ray LOUT. In this example, the light-emitting device 400 can be used as Figure 3B the light-emitting devices 321B, 331B or 341B.

[0069] Figure 5 This is a flowchart showing the synchronization method of the present invention. The synchronization method of the present invention can exist in the form of program code. When the program code is loaded and executed by a machine, the machine becomes a light-emitting device for implementing the present invention. First, it is determined whether a light detection function is enabled (step S511). In a possible embodiment, step S511 determines whether a sensing circuit is activated. When the sensing circuit is activated, it indicates that the light detection function is enabled. When the sensing circuit is not activated, it indicates that the light detection function is not enabled.

[0070] When the light detection function is not enabled, a first light ray is emitted (step S512). Then, it is determined whether a first synchronization message needs to be added to the first light ray (step S513). In a possible embodiment, step S513 determines whether a specified event has occurred. The specified event may be that the count value of a counter reaches an upper limit value.

[0071] When the specified event has not occurred, it means that a first synchronization message does not need to be added to the first light ray. Therefore, return to step S512 to continue providing the first light ray. However, when the specified event has occurred, it means that a first synchronization message needs to be added to the first light ray. Therefore, add the first synchronization message to the first light ray and send the first light ray with the first synchronization message (step S514). Then, stop adding the first synchronization message to the first light ray (step S515), and return to step S512 to send the first light ray without the first synchronization message.

[0072] When the light detection function is enabled, a second light ray is emitted (step S516), and a third light ray is detected (step S517). Then, it is determined whether the third light ray has a second synchronization message (step S518). When the third light ray does not have the second synchronization message, return to step S516 to continue emitting the second light ray. However, when the third light ray has the second synchronization message, adjust the emission time point of the second light ray (step S519).

[0073] In other embodiments, steps S511 and S516 - S519 can be omitted. If steps S511 and S516 - S519 are omitted, then step S512 further detects whether the first light ray has a synchronization message. In some embodiments, step S512 drives a first light-emitting element to emit the first light ray and drives a photosensitive element to detect the first light ray.

[0074] Next, it is determined whether a first synchronization information needs to be added to the first light beam (step S513). When it is necessary to add the first synchronization information to the first light beam, the first light beam with the first synchronization information is transmitted (step S514). At this time, since the first light beam has the first synchronization information, step S514 further controls a second light-emitting element. In a possible embodiment, step S514 may adjust the light-emitting time and / or the light color of the second light-emitting element according to the first synchronization information. Next, adding the first synchronization information to the first light beam is stopped (step S515), and the process returns to step S512 to transmit the first light beam without the first synchronization information, and the detection of the first light beam continues.

[0075] By adding synchronization information to a first light beam, a second light beam can be synchronized. Therefore, there is no need to additionally provide physical transmission traces and physical transmission interfaces, so that the operations of two independent devices can be synchronized, and the manufacturing cost can be reduced.

[0076] It must be understood that when an element is mentioned as being "coupled" to another element, it can be directly coupled or connected to other elements, or there may be other elements in between. On the contrary, when an element is "connected" to other elements, there will be no other elements in between.

[0077] Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. For example, the systems, devices or methods described in the embodiments of the present invention can be implemented by physical embodiments of hardware, software or a combination of hardware and software. Therefore, the protection scope of the present invention shall be subject to the scope defined by the appended claims.

Claims

1. A light emitting device, characterized in that: include: A light emitting element, providing a first light; a control circuit, coupled to the light emitting element, for controlling the first light; as well as a photosensitive circuit, detecting a second light, in: During a synchronization period, the control circuit adjusts the first light so that the first light has first synchronization information.

2. The light emitting device according to claim 1, characterized in that: During a light-emitting period, the control circuit sets a physical property of the first light to a first preset value. During the synchronization period, the control circuit sets the physical property of the first light to a second preset value, The second preset value is different from the first preset value.

3. The light emitting device according to claim 2, characterized in that: During the light-emitting period, the time length for which the light-emitting element provides the first light is the first preset value. During the synchronization period, the time length for which the light emitting element provides the first light is the second preset value.

4. The light emitting device according to claim 2, characterized in that: During the light emission period, the intensity of the first light is the first preset value, During the synchronization period, the intensity of the first light is the second preset value.

5. The light emitting device according to claim 1, characterized in that: During a first light-emitting period, the control circuit provides a plurality of first pulses to the light-emitting element. During the synchronization period, the control circuit provides at least one second pulse to the light emitting element. The width of the first pulses is different from the width of the second pulse.

6. An operating device, characterized in that: include: A first light emitting device, comprising: a first light emitting element, for providing a first light; and a first control circuit, coupled to the first light emitting element, for controlling the first light; and A second light emitting device, comprising: a second light emitting element, generating a second light; a photosensitive circuit, detecting the first light to generate a detection signal; and A second control circuit adjusts the time point when the second light emitting element generates the second light according to the detection signal.

7. The operating device according to claim 6, characterized in that When the first light has synchronization information, the second control circuit adjusts the time point when the second light emitting element provides the second light.

8. The operating device according to claim 6, characterized in that The synchronization information is a visible light.

9. The operating device according to claim 6, characterized in that: The synchronization information is an invisible light.

10. A synchronization method, characterized in that: Applicable to an operating device, the operating device includes a first light-emitting element and a second light-emitting element, and includes: Driving the first light emitting element to emit a light; Determine whether a specified event occurs; When the designated event occurs, setting the light to have synchronization information; determining whether the light has the synchronization information; and When the light has the synchronization information, the second light emitting element is controlled.

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