TWI714249B - Projection device and projection signal search method - Google Patents

Abstract

A projection device having a plurality of signal receivers, a processor and a projection module is provided. The signal receivers are configured to receive an image signal when connected to a signal source via cables. The processor connected to the signal receivers receives the image signal from one of the signal receivers. The processor determines whether the signal receiver is connected to the cable, and search the signal receivers connected to the cable to determine whether the signal receiver receives the image signal. The projection module connected to the processor is configured to project an image according to the image signal.

Description

Projection device and projection signal search method

The invention relates to a signal search technology, and more particularly to a projection device and a projection signal search method.

In the existing projector, when the automatic search signal is turned on, the processor searches the signal receivers in a fixed order to determine whether the signal receivers receive the signal. For example, if the signal receiver of the projector includes a first high-definition multimedia interface (High Definition Multimedia Interface, referred to as HDMI interface), a second HDMI interface, and a video graphic array (Video Graphic Array, referred to as VGA interface), each In a process of searching for signals, the processing unit searches for signals in the order of the first HDMI interface, the second HDMI interface, and the VGA interface, for example.

With the development of various types of signal receivers and the improvement of hardware, there are more and more different types of signal receivers on the market. In order to maintain the compatibility between the projector and the signal source, the projector mostly retains various types of signal receivers and is equipped with multiple mainstream signal receivers. In this way, the signal receiver of each projector There will be more than one signal. If the projector searches each signal receiver one by one, it will be quite inefficient. In particular, if there are signal receivers that are not required by the user or have special specifications, the utilization rate of these signal receivers is usually quite low.

The "prior art" paragraph is only used to help understand the content of the present invention. Therefore, the content disclosed in the "prior art" paragraph may contain some conventional technologies that do not constitute the common knowledge in the technical field. The content disclosed in the "prior art" paragraph does not represent the content or the problem to be solved by one or more embodiments of the present invention, and has been known or recognized by those with ordinary knowledge in the technical field before the application of the present invention.

The invention provides a projection device and a projection signal search method, which are used to improve the process of searching for image signals, so as to improve the efficiency of searching for image signals and save search time.

In order to achieve one or part or all of the above-mentioned objectives or other objectives, the present invention provides a projection device having multiple signal receivers, processors, and projection modules. The signal receiver is used to receive the image signal when connected to the signal source through the transmission line. The processor is connected to the signal receiver to receive the image signal from one of the signal receivers. The processor determines whether the signal receiver is connected to the transmission line, and searches for whether the signal receiver connected to the transmission line receives the image signal. The projection module is connected to the processor for projecting an image according to the image signal.

In an embodiment of the present invention, the above-mentioned projection device further includes a storage The search processor is connected to the search processor. The search processor records the usage status of searching for some signal receivers in the search memory. The search usage status includes at least the cumulative number of times each search signal receiver receives the search image signal at all times, each One of the cumulative number of times a search signal receiver receives search image signals within a specified time interval or the frequency at which each search signal receiver receives search image signals within a search specified time interval.

In an embodiment of the present invention, in the above-mentioned projection device, the search processor searches for some signal receivers connected to the search transmission line according to the search mode, and the search mode corresponds to the search designation according to the order of the cumulative search times from high to low. Search for at least one of the search signal receivers connected to the search transmission line in the descending order of the cumulative search times in the time interval or the search frequency in the search specified time interval.

In an embodiment of the present invention, the above-mentioned projection device further includes an input device connected to the search processor to receive a search mode setting command, so that the search processor can change the search mode according to the search mode setting command.

In an embodiment of the present invention, in the above-mentioned projection device, the search input device receives a clear command, so that the search processor resets the search usage in the search storage to zero according to the search clear command.

In an embodiment of the present invention, in the above-mentioned projection device, at least one of the search signal receivers includes a pin, and the search pin is connected to the search processor, so that the search processor detects the voltage of the search pin When it is the preset voltage, it is determined that at least one of the signal receivers is connected to the search transmission line.

In an embodiment of the present invention, in the above-mentioned projection device, at least one of the searched signal receivers is a High Definition Multimedia Interface (HDMI).

In an embodiment of the present invention, in the above-mentioned projection device, at least one of the search signal receivers includes a signal module and a register, and when the search signal module is connected to the search transmission line, the search register changes The connection state setting value allows the search processor to determine that at least one of the signal receivers is connected to the search transmission line according to the search connection state setting value.

In an embodiment of the present invention, in the above-mentioned projection device, the search signal receivers include at least one of a video graphics interface (Video Graphics Array, VGA) and a composite video broadcast signal interface (Composite Video Baseband Signal, CVBS).

In an embodiment of the present invention, in the above-mentioned projection device, the search processor also determines whether the connection status of the search signal receivers and the search transmission line when the search signal receivers of the search connection search transmission line receive the search image signal Change, and when it detects that one of the signal receivers is not connected, the search transmission line is changed to the search transmission line is connected, and it is determined that one of the search receivers receives the search image signal, based on the search for the signal receivers One of the search image signals is projected to search the image.

In an embodiment of the present invention, in the above-mentioned projection device, the search processor stops searching for the connection search transmission line when one of the search signal receivers receiving the search image signal is received Whether the device receives the search image signal.

In order to achieve one or part or all of the above objectives or other objectives, the present invention provides a projection signal search method, which is suitable for a projection device, and the projection device has a plurality of signal receivers, processors, and projection modules. This projection signal search method has the following steps: through the processor, determine whether the signal receiver is connected to the transmission line; through the processor, search for whether the signal receiver connected to the transmission line receives the image signal; and through the projection module, the signal receiver One of the received image signals is projected into an image.

In an embodiment of the present invention, the projection signal search method described above, wherein the memory of the search processor is used to record the use situation of searching for some signal receivers, and the use situation includes at least that each search signal receiver receives at all times One of the cumulative number of search image signals, the cumulative number of search image signals received by each search signal receiver in the specified time interval, or the frequency at which each search signal receiver receives the search image signal in the search specified time interval.

In an embodiment of the present invention, the above-mentioned projection signal search method, wherein search some signal receivers connected to search transmission lines according to the search mode, the search mode corresponds to searching at a specified time according to the order of cumulative search times from high to low Search for at least one of the search signal receivers connected to the search transmission line in the descending order of the cumulative search times in the interval or the search frequency in the search specified time interval.

In an embodiment of the present invention, in the projection signal search method described above, the search processor receives a search mode setting command to set the search mode according to the search processor. Order to change the search mode.

In an embodiment of the present invention, the above-mentioned projection signal search method includes receiving a clear command through the search processor and zeroing the search usage condition according to the search clear command through the search processor.

In an embodiment of the present invention, the above-mentioned projection signal search method, in which the step of determining whether the search signal receivers are connected to the search transmission line, further includes detecting the connection of one of the search signal receivers through the search processor Whether the voltage of the pin is the preset voltage, wherein when the voltage of the search pin is the preset voltage, it is determined that at least one of the search signal receivers is connected to the search transmission line.

In an embodiment of the present invention, in the above projection signal search method, at least one of the search signal receivers includes a signal module and a register, and in the step of determining whether the search signal receivers are connected to the search transmission line , Also includes changing the connection status setting value in the search register through the search signal module; and judging to search for at least one of the signal receivers connected to the search transmission line according to the search connection status setting value through the search processor.

In an embodiment of the present invention, the above-mentioned projection signal search method, in the step of searching for connection and searching transmission lines for searching whether some signal receivers receive the search image signal, further includes determining to search for some signal receivers through the search processor Whether the connection status with the search transmission line has changed; through the search processor, when one of the signal receivers is detected, the search transmission line is changed from disconnected search transmission line to connection search transmission line, search for whether one of the signal receivers is receiving the search Video signal; and through the search processor, search for one of the signal receivers to receive When searching for an image signal, the search image is projected based on the search image signal of one of the search receivers.

In an embodiment of the present invention, in the above-mentioned projection signal search method, the step of searching for the connection search transmission line to search whether some signal receivers receive the search image signal further includes searching the connection search transmission line through the search processor When searching for one of the signal receivers to receive the search image signal, stop searching the connection and search the transmission line to search whether the signal receiver receives the search image signal.

Based on the above, the projection device and the projection signal search method of the present invention will determine which signal receivers are connected to the transmission line, and search for the signal receivers connected to the transmission line, which reduces unnecessary searches and saves unnecessary search time. The projection device can project images faster.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

100, 400: Projection device

110, 410: signal receiver

120, 420: processor

130, 430: projection module

440: Storage

450: Input

S310~S330: steps

FIG. 1 shows a schematic diagram of a projection device according to an embodiment of the invention.

FIG. 2 is a block diagram of a projection device according to an embodiment of the invention.

3 is a schematic flowchart of a projection signal search method according to an embodiment of the invention.

4 is a schematic block diagram of a projection device according to another embodiment of the invention.

FIG. 1 shows a schematic diagram of a projection device 100 according to an embodiment of the invention. FIG. 2 is a block diagram of the projection apparatus 100 according to an embodiment of the invention. 1 and 2 at the same time, the projection device 100 has a signal receiver 110, a processor 120 and a projection module 130.

The signal receiver 110 is used for receiving various types of image signals. In detail, when the signal receiver 110 is connected to a signal source (for example, a personal computer, a mobile phone, an external storage device for storing images), etc. through a transmission line, it can receive an image signal from the signal source. In an embodiment of the present invention, the signal receiver 110 is, for example, various types of image transmission interfaces, for example, it supports High Definition Multimedia Interface (HDMI interface) and Video Graphic Array (Video Graphic Array). VGA interface), composite video broadcast signal interface (Composite Video Baseband Signal, CVBS), mobile high definition link technology (Mobile High Definition Link, MHL), digital video interface (Digital Visual Interface, DVI), S/PDIF (Sony/ Philips Digital Interface Format), Ethernet adapter, etc., the present invention is not limited to this. In addition, the transmission line connected to the signal receiver 110 is compatible with the transmission line of the signal receiver 110. For example, if the signal receiver 110 is an HDMI interface, the transmission line connected here is an HDMI connection line. In addition, the number of signal receivers 110 can be multiple, and each signal receiver 110 can support the same or different types of image signals, and the present invention is not limited to this.

The processor 120 is connected to the signal receiver 110 and used to execute the projection device 100 required various operations. In particular, the processor 120 searches the signal receiver 110 to detect whether the signal receiver 110 receives an image signal, and thereby receives the image signal from one of the signal receiver 110. Specifically, the processor 120 can determine whether the signal receiver 110 is connected to a transmission line, the processor 120 can search for whether one or more signal receivers 110 connected to one or more transmission lines receive the image signal, and the processor 120 can send the signal The image signal received by one of the receivers 110 is projected into an image. In an embodiment of the present invention, the processor 120 is, for example, a central processing unit (CPU), or other programmable general-purpose or special-purpose microprocessors or digital signal processors. (Digital Signal Processor, DSP), programmable controller, Application Specific Integrated Circuit (ASIC) or other similar components or a combination of the above components, the present invention is not limited to this.

The projection module 130 is connected to the processor 120. When the processor 120 receives the image signal, it instructs the projection module 130 to project an image according to the image signal. In an embodiment of the present invention, the projection module 130 is, for example, a device composed of a light source module, a light valve, and a projection lens, and has the ability to receive image signals and project images. The hardware structure of the projection module 130 is not limited to this. For example, the light source module may include multiple visible light emitting elements, multiple non-visible light emitting elements, or a combination of the above two light emitting elements. The visible light emitting element may be a light-emitting diode (LED) or a laser diode (LD), but is not limited thereto. The visible light emitting element may include a blue light emitting element, and the non-visible light emitting element may include an ultraviolet light emitting element, but is not limited thereto. The light valve can be a transmissive LCD panel or other spatial light modulation The light valve is, for example, a digital micro-mirror device (DMD), a liquid crystal on silicon (LCOS) or a liquid crystal display panel (LCD panel), and the number of light valves It can be one to more, but is not limited to this. The projection lens includes, for example, a combination of one or more optical lenses with refractive power. The optical lenses include, for example, biconcave lenses, biconvex lenses, meniscus lenses, convex-concave lenses, plano-convex lenses, plano-concave lenses and other non-planar lenses or various combinations thereof. The type and type of projection lens are not limited.

3 is a schematic flowchart of a projection signal search method according to an embodiment of the invention. The projection signal search method of this embodiment is at least applicable to the projection apparatus 100 of FIG. 1 and FIG. 2, but the invention is not limited to this. Hereinafter, the operation details of the projection apparatus 100 and the steps S310 to S330 of the projection signal search method will be described with reference to FIGS. 1 to 3. Specifically, the projection device 100 may execute steps S310 to S330 through the processor 120. In one embodiment, the projection device 100 may include one or more processors 120 to control other devices to perform steps S310 to S330 respectively, such as a processor. 120 controls the projection module 130 to perform step S330 through the projection module 130, and the present invention is not limited to this.

In an embodiment of the present invention, the projection signal search method is executed when the projection device 100 receives a command to search for the signal source. Or, in another embodiment of the present invention, the projection device 100 is preset to automatically search for the signal source. Therefore, if the projection device 100 is in a shutdown or sleep state, when the enable signal is received, the projection device 100 will run the projection signal search method.

In step S310, the processor 120 determines whether the signal receiver 110 is No connection to the transmission line.

Specifically, in the first aspect of the signal receiver 110, the signal receiver 110 has pins, such as, but not limited to, a universal input and output pin with a voltage of 5 volts. This pin is connected to the processor 120. The processor 120 determines that at least one of the signal receivers 110 is connected to the transmission line when detecting that the voltage of the pin is a predetermined voltage (5 volts (voltage) in this embodiment). It is worth mentioning that this type of signal receiver 110 is for example but not limited to an HDMI interface.

In addition, in the second aspect of the signal receiver 110, the signal receiver 110 may also include a signal module and a register. The signal module is, for example, an AFE1000 chip, and is connected to the processor 120 through an integrated circuit bus (Inter-Integrated Circuit, I ² C), but the present invention is not limited thereto. When the transmission line is connected, the signal module will change the connection state setting value in the register, for example, but not limited to, the connection state setting value is 0 and changed to 1. And, if the signal module loses connection with the transmission line, the connection status setting value is changed from 1 to 0. Thereby, the processor 120 can directly read the connection state setting value in the register, and determine that the signal receiver 110 is connected to the transmission line according to the connection state setting value. The signal receiver 110 of this type is, for example, but not limited to, a video graphics interface (Video Graphics Array, VGA) and a composite video broadcast signal interface (Composite Video Baseband Signal, CVBS).

It should be noted that in the embodiment of the present invention, the plurality of signal receivers 110 may respectively adopt the aforementioned first aspect, second aspect, or a combination of the first aspect and the second aspect. In addition, the signal receiver 110 is not limited to the first and second aspects, and anything that can provide the processor 120 to detect the signal receiver 110 and the transmission line The signal receiver 110 in the connected state can be applied to the present invention.

In step S320, the processor 120 searches whether one or more signal receivers 110 connected to one or more transmission lines receive an image signal to determine whether each signal receiver 110 receives an image signal. Specifically, in an embodiment of the present invention, the processor 120 will only search for whether the signal receiver 110 connected to the transmission line receives the image signal according to the search mode, and does not search for other signal receivers 110 that are not connected to the transmission line.

In this way, the processor 120 searches for one or more signal receivers 110 connected to the transmission line according to the search mode, which can reduce unnecessary searching, thereby saving unnecessary searching time, and enabling the projection device to project images faster.

第一HDMI接口與VGA接口分別與傳輸線相連，而其餘訊號連接 器110則不與傳輸線相連。 In order to easily understand the process of the processor 120 searching for the signal receiver 110, the following example of a projection device will be used to assist in the description. In this case, the projection device 100 has five signal receivers 110, and the manner in which they are connected to the transmission line is shown in Table 1:

The first HDMI interface and the VGA interface are respectively connected to the transmission line, and the remaining signal connectors 110 are not connected to the transmission line.

In an embodiment of the present invention, the processor 120 searches whether the signal receiver 110 connected to the transmission line receives the image signal every time according to a preset sequence. Take the case of Table 1 to illustrate, the preset sequence is, for example, the first HDMI interface, the second HDMI interface, the third HDMI interface, the VGA interface, and the CVBS interface. However, since in this case, the second HDMI interface, the third HDMI interface and the CVBS interface are not connected to the transmission line, when the processor 120 searches for the first HDMI interface, it will skip the second HDMI interface and the third HDMI interface. HDMI port, directly search whether the VGA port receives video signal. However, the present invention does not limit the sequence in which the processor 120 searches for the signal receiver 110.

In this embodiment, if the processor 120 is searching for one of the plurality of signal receivers 110 connected to the transmission line to receive an image signal, and confirms that the signal receiver 110 has received an image signal, it stops searching for other signal receivers 110. Furthermore, in step S330, the image signal received from one of the signal receivers 110 is projected into an image through the projection module 130. For example, when the processor 120 scans the first HDMI interface, if the image signal has been searched for the first HDMI interface, the processor 120 does not search for the VGA interface, and controls so that the projection module 130 receives the projection from the first HDMI interface Video signal.

In another embodiment of the present invention, when the processor 120 searches for an image signal, it will project the image signal into an image through the projection module 130. However, the processor 120 will continue to search for other signal receivers 110 connected to the transmission line, and use the projection module 130 to project the name of the signal receiver 110 that has received the image signal into Like. Or, when the menu of the signal receiver 110 is displayed, the signal receiver 110 that receives the image signal is marked with different colors, and the present invention is not limited to this.

It is worth mentioning that in this embodiment, when the processor 120 searches for whether the signal receiver 110 connected to the transmission line receives the image signal, it will continue to determine whether the connection state between the signal receiver 110 and the transmission line has changed, and detect When one of the signal receivers 110 is disconnected from the transmission line to be connected to the transmission line, and when one of the signal receivers 110 receives the image signal, the image is projected according to the image signal of one of the signal receivers. For example, when the processor 120 is searching for whether the first HDMI interface receives the image signal, the connection state of the second HDMI interface suddenly changes from disconnected to connected. At this time, the processor 120 will further determine whether the second HDMI interface is receiving Video signal. If the second HDMI interface has received the image signal, the processor 120 will transmit the image signal received by the second HDMI interface to the projection module 130, so that the projection module 130 can place the image according to the image information received by the second HDMI interface .

With the projection device 100 and the projection signal search method, the processor 120 can search for the signal receiver 110 connected to the transmission line to improve the search efficiency.

FIG. 4 is a block diagram of a projection device 400 according to another embodiment of the invention. Please refer to FIG. 4, in this embodiment, the projection apparatus 400 includes a storage 440 and an input 450 in addition to the signal receiver 410, the processor 420 and the projection module 430. The signal receiver 410, the processor 420 and the projection module 430 are the same as the signal receiver 110, the processor 120 and the projection module 130 in the embodiment of FIG. In addition, the projection device 400 can execute the projection signal search method of FIG. 3, so it will not be repeated here.

The storage 440 is connected to the processor 420 for storing software, data, and various program codes. In particular, the processor 420 can record the usage status of the signal receiver 410 in the storage 440. In this embodiment, the usage scenarios include, but are not limited to, the cumulative number of video signals received by each signal receiver 410 at all times, the cumulative number of video signals received by each signal receiver 410 in a specified time interval, or each A signal receiver 410 receives one of the frequency of the video signal in a specified time interval, etc. All times mentioned here refer to the time from the moment when the projection device 400 is initialized to the current time, and the specified time interval is, for example, 1 week, 1 month, 1 year, or an interval represented by an absolute date (for example, April 1, 2019 to April 30, 2019). The present invention does not limit the length and the representation mode of the designated time interval. The storage 440 can be any type of fixed or removable random access memory (Random Access Memory, RAM), read-only memory (Read-Only Memory, ROM), and electronic erasing is a rewritable read-only memory ( Electrically-Erasable Programmable Read-Only Memory (EEPROM), flash memory (flash memory), hard disk (HDD), solid state drive (Solid State Drive, SSD) or similar components or a combination of the above components.

The input 450 is connected to the processor 420 for generating corresponding input signals according to the user's operation, and transmitting them to the processor 420. The input 450 is, for example, an infrared signal receiver, a physical button provided on the casing of the projection device 400, and an Internet Network transmission interface (for example, WiFi interface, Ethernet interface, etc.), the present invention is not limited to this. The functions of the storage 440 and the input 450 in the projection device 400 will be described below.

In an embodiment of the present invention, the projection device 400 allows the user to select different search modes through the input 450. For example, the search mode can correspond to the order of accumulative times used by the signal receiver 410 from high to low, the order of accumulative times used by the signal receiver 410 in a specified time interval, or the signal receiving in a specified time interval. The frequency of the receiver 410 receives the image signal from high to low to schedule a search sequence, and searches whether the signal receiver 410 connected to the transmission line receives at least one of the image signals. Since these data have been recorded in the storage 440, when the input 450 receives the search mode setting command, the search mode setting command will be sent to the processor 420 so that the processor 420 can set the command according to the search mode Change the search mode. Since the processor 420 can read the usage conditions stored in the storage 440, it can further search the signal receiver 410 according to the specified search mode.

從表二可以看出，在所有時間內，第二HDMI接口是最常被使用的，接著是VGA接口、第三HDMI接口、第一HDMI接口以及CVBS接口。因此，倘若搜尋模式是依據訊號接收器410使用的累積次數由高到低的順序進行搜尋，並排除掉不連接的訊號接收器410，處理器410會先搜尋VGA接口，接著搜尋第一HDMI接口。 For example, if the projection device 400 is always placed in the same conference room, the user can set the search mode of the projection device 400 to be based on the signal receiver because the department personnel using the conference room and the environment of the conference room are relatively small. 410 uses the cumulative number of times from high to low. Let’s take the aforementioned case to illustrate. In this case, there are five signal receivers 410, and the cumulative number of uses is recorded as Table 2:

It can be seen from Table 2 that the second HDMI interface is the most commonly used at all times, followed by the VGA interface, the third HDMI interface, the first HDMI interface, and the CVBS interface. Therefore, if the search mode is to search based on the cumulative number of times the signal receiver 410 is used from high to low, and exclude the signal receiver 410 that is not connected, the processor 410 will first search for the VGA interface, and then search for the first HDMI interface .

If the projection device 400 is changed from the original meeting room to another meeting room, at this time, the environment of the meeting room and the department staff used may be changed. Therefore, the user can adjust the search mode to be in the specified time interval. The order of the cumulative number of times used by the signal receiver 410 is from high to low, or the order of the frequency used by the signal receiver 410 in a specified time interval from high to low, so as to improve the search efficiency. The method of searching in the order of the cumulative number of times used by the signal receiver 410 in the specified time interval or the order of the used frequency from high to low is similar to the order of the cumulative times used by the signal receiver 410 from high to low. , No further explanation here.

It is worth mentioning that in other embodiments of the present invention, the projection device 400 may further have the capability of environmental sensing (for example, installing a light sensor, distance Away from the sensor, or the user adjusts the record of the image delivery settings to estimate whether the environment has changed, etc.). When the projection device 400 detects a change in the environment, it automatically adjusts the search mode to the order of the cumulative number of times the signal receiver 410 is used in the specified time interval, or the signal receiver 410 is used in the specified time interval. The order of frequency from high to low to improve search efficiency.

In addition, the user can also issue a command to clear the record through the input 450. When the input 450 receives the clear instruction, it sends the clear instruction to the processor 420, so that the processor 420 resets the usage status in the storage 440 to zero according to the clear instruction. In this way, to clear the accumulated usage.

Based on the projection device 400 of the embodiment in FIG. 4, the processor 420 can not only search for the signal receiver 410 connected to the transmission line, but can also adjust the search sequence according to the user's usage, thereby improving the search efficiency.

In summary, the projection device and projection signal search method of the present invention will determine which signal receivers are connected to the transmission line, and search for the signal receivers connected to the transmission line, reducing unnecessary searches. Not only that, by adjusting the search order, the projection device and the projection signal search method can preferentially search for signal receivers with a higher utilization rate, which improves the efficiency of signal search, thereby saving unnecessary search time, and making the projection device project faster. Out of the image.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be determined by the scope of the attached patent application.

S310~S330: steps

Claims (20)

A projection device includes: a plurality of signal receivers for receiving an image signal when connected to a signal source through a transmission line; a processor connected to the signal receivers to receive from one of the signal receivers For the image signal, the processor determines whether the signal receivers are connected to the transmission line, and searches whether the signal receivers connected to the transmission line receive the image signal and does not search for the signal receivers that are not connected to the transmission line; and The projection module is connected to the processor for projecting an image according to the image signal. For example, the projection device described in item 1 of the scope of patent application further includes: a memory connected to the processor, and the processor records the usage status of the signal receivers in the memory, wherein the usage status is at least Including the cumulative number of times that each signal receiver receives the image signal at all times, the cumulative number of times that each signal receiver receives the image signal in a specified time interval, or the cumulative number of times that each signal receiver receives the image signal in the specified time interval One of the frequencies at which the video signal is received. For example, the projection device described in item 2 of the scope of patent application, wherein the processor searches for the signal receivers connected to the transmission line according to a search mode, and the search mode corresponds to the order of accumulative times in descending order. The order of the cumulative number of times in the specified time interval from high to low or the frequency in the specified time interval from high to low In a low order, it searches whether the signal receivers connected to the transmission line receive at least one of the image signals. For example, the projection device described in item 3 of the scope of patent application further includes: an input device connected to the processor to receive a search mode setting command so that the processor can change the search mode according to the search mode setting command. For the projection device described in item 4 of the scope of patent application, the input device receives a clearing instruction, so that the processor resets the usage condition in the storage to zero according to the clearing instruction. For the projection device described in claim 1, wherein at least one of the signal receivers includes a pin, and the pin is connected to the processor, so that the processor detects the pin When the voltage is the preset voltage, it is determined that at least one of the signal receivers is connected to the transmission line. According to the projection device described in item 6 of the patent application, at least one of the signal receivers is a high-definition multimedia interface. For the projection device described in item 1 of the scope of patent application, wherein at least one of the signal receivers includes a signal module and a register, and when the signal module is connected to the transmission line, the register in the register is changed The connection state setting value enables the processor to determine that at least one of the signal receivers is connected to the transmission line according to the connection state setting value. According to the projection device described in item 8 of the scope of patent application, the signal receivers include at least one of a video graphics interface and a composite video broadcast signal interface. For example, the projection device described in item 1 of the scope of patent application, wherein the processor, when searching for whether the signal receivers connected to the transmission line receive the image signal, also determines whether the connection status of the signal receivers and the transmission line is Change, and when detecting that one of the signal receivers changes from disconnecting the transmission line to connecting the transmission line, and determining that one of the signal receivers receives the image signal, according to the signal receivers The image signal of one of them projects the image. For example, the projection device described in claim 1, wherein the processor stops searching for the signal receivers connected to the transmission line when one of the signal receivers connected to the transmission line receives the image signal Whether the receiver receives the image signal. A projection signal search method is suitable for a projection device, and the projection device includes a plurality of signal receivers, a processor, and a projection module. The projection signal search method includes: judging whether the signal receivers are connected to the processor through the processor A transmission line; through the processor, search for whether the signal receivers connected to the transmission line receive an image signal and do not search for the signal receiver not connected to the transmission line; and through the projection module, the signal receiver One of the received image signals is projected into an image. For example, the projection signal search method described in item 12 of the scope of patent application further includes: recording the usage of the signal receivers through a memory of the processor, Wherein, the use situation includes at least the cumulative number of times that each signal receiver receives the image signal at all times, the cumulative number of times that each signal receiver receives the image signal in a specified time interval, or each of the signal receivers One of the frequencies at which the video signal is received in the specified time interval. For example, the projection signal search method described in item 13 of the scope of patent application, wherein the signal receivers connected to the transmission line are searched according to the search mode, and the search mode corresponds to the order according to the cumulative number of times in descending order. Search for at least one of the signal receivers connected to the transmission line in the descending order of the cumulative number of times in the time interval or in the descending order of the frequency in the designated time interval. For example, the projection signal search method described in item 14 of the scope of patent application further includes: receiving a search mode setting command through the processor, so as to change the search mode according to the search mode setting command. For example, the projection signal search method described in item 13 of the scope of patent application further includes: receiving a clear command through the processor; and resetting the usage situation to zero according to the clear command through the processor. For example, the projection signal search method described in item 12 of the scope of patent application, wherein the step of determining whether the signal receivers are connected to the transmission line further includes: detecting one of the signal receivers through the processor Voltage of one pin Whether it is a preset voltage, wherein when the voltage of the pin is a preset voltage, it is determined that at least one of the signal receivers is connected to the transmission line. For example, the projection signal search method described in item 12 of the patent application, wherein at least one of the signal receivers includes a signal module and a register, and it is determined whether the signal receivers are connected to the transmission line The step further includes: changing the connection state setting value in the register through the signal module; and judging that at least one of the signal receivers is connected to the transmission line according to the connection state setting value through the processor. For example, the projection signal search method described in item 12 of the scope of patent application, wherein, in the step of searching whether the signal receivers connected to the transmission line receive the image signal, the step further includes: judging the signal reception through the processor Whether the connection status between the transmitter and the transmission line is changed; and through the processor, when one of the signal receivers is detected, it is changed from disconnecting the transmission line to the transmission line, searching for one of the signal receivers Whether to receive the image signal; through the processor, when one of the signal receivers receives the image signal, the image is projected according to the image signal of one of the signal receivers. For example, the projection signal search method described in item 12 of the scope of patent application, wherein the step of searching whether the signal receivers connected to the transmission line receive the image signal further includes: searching through the processor to connect the transmission line Of those signal receivers When one of them receives the image signal, it stops searching whether the signal receivers connected to the transmission line receive the image signal.

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