TWI479360B - Optical sensing device capable of switching operation mode and control method thereof - Google Patents

Description

Optical sensing device capable of switching operation mode and control method thereof

The present invention relates to an optical sensing device, and more particularly to an operation mode capable of switching an optical sensing device, so that the optical sensing device not only has the function of light sensing, but also has other functions such as a remote controller. Optical sensing device of switchable operation mode and control method thereof.

In recent years, optical sensing devices have been widely used in various electronic products. Smart Phone, Desk Top Computer, Note Book, Tablet Computer, Liquid Crystal Displayer (LCD), Plasma TV (Plasma TV) And electronic navigation devices such as Kiosh Station, which need to detect specific light sources, are equipped with optical sensing devices.

Among them, the Proximity Sensor can sense whether an object is close to the sensor. Taking a common smart phone as an example, the proximity sensor is set on the mobile phone to detect whether the user is close to the mobile phone, so that the mobile phone can react differently, and the proximity sensor has no other. The function. However, the infrared light-emitting diodes provided on the proximity sensor can actually be used for a variety of purposes. Therefore, how to develop an optical sensing device, in addition to being executed when being disposed in an electronic device In addition to the light sensing operation, it is also possible to perform other different functions by using the infrared light emitting diode provided therein, which is the problem to be solved by the present invention.

In view of the above problems of the prior art, an object of the present invention is to provide an optical sensing device and a control method thereof that can switch operating modes, so as to solve the optical sensing device of the prior art, which can only perform light sensing work, functions. Insufficient issues.

According to an object of the present invention, an optical sensing device capable of switching operation modes is provided, comprising: an infrared light emitting diode emitting infrared light; and a multiplexer having an output end, a first input end and a second input end, The output end is coupled to the infrared light emitting diode; the sensing device driver is coupled to the first input end of the multiplexer and the driven device, and the driven device is coupled to the first input end of the multiplexer, and then connected through the serial The Serial Data Line (SDA) and the Serial Clock Line (SCK) are connected to the Master Device; and the direct access line directly connects the second input of the multiplexer. Connecting with the serial data line; wherein, when in the normal mode, the multiplexer connects the output end to the first input end, so that the main control device transmits the signal to the serial data line and the serial clock line according to an external command to The slave device enables the sensing device driver to control the infrared light emitting diode to perform light sensing work; when in the direct access mode, the multiplexer connects the output end with the second input terminal to enable multiplexing Illuminated by Diode driver switches to the direct access line, the external command received by the master device directly controls the infrared light emitting diode.

According to the purpose of the present invention, a control method for switching an operation mode of an optical sensing device is further provided, which comprises the steps of: directly connecting a second input end of the multiplexer to the serial data line by using a direct access line; using the main control The device, when in the normal operation mode, connects the output end of the multiplexer to the first input end, and then transmits the serial data line and The serial clock transmits a signal to the slave device, so that the sensing device driver controls the infrared light emitting diode to perform the light sensing operation; and receives an external command via the master device, so that the multiplexer outputs the output terminal and the second input terminal Connected, the multiplexer is switched from the LED driver to the direct access line to enter the direct access mode; and the external control unit receives the external command to directly control the infrared illuminator.

Wherein, when the slave device detects that the signal of the pulse transmission stops in the serial sequence, it switches to the direct access mode.

Wherein, when the slave device detects that the voltage of the pulse line is fixed to the power supply voltage (V _DD ) or zero, it is determined that the serial line pulse transmission signal stops.

Wherein, the external command can be received by the main control device to drive the serial pulse line to retransmit the signal, and when the slave device senses that the complete command signal is input by the serial clock line, the direct access mode is switched to the normal operation. mode.

Wherein, when the slave device senses that the signals of the plurality of timing periods are input by the serial clock line, the direct access mode is switched to the normal operation mode.

Among them, when the master device and the slave device can use an Inter-Integrated Circuit (I ² C) communication protocol or a system management bus (SMBUS) communication protocol.

Wherein, the optical sensing device can be a Proximity Sensor.

In view of the above, an optical sensing device and a control method thereof according to the switchable operation mode of the present invention may have one or more of the following advantages:

(1) The optical sensing device of the switchable operation mode and the control method thereof can be performed by switching the operation mode of the optical sensing device, so that the optical sensing device performs the light sensing In addition, it can be used for other purposes, so it is very practical.

(2) The optical sensing device and the control method thereof of the switchable operation mode do not need to add too much extra circuit, so that the operation mode of switching the optical sensing device can be achieved at a low cost, so effectiveness.

1‧‧‧Optical sensing device

4~6‧‧‧ proximity sensor

11‧‧‧Driver

12‧‧‧Sensor device driver

13‧‧‧Multiplexer

131, 431‧‧‧ first input

132, 432‧‧‧ second input

133, 433‧‧‧ output

14, 44‧‧‧ Infrared light-emitting diode

15‧‧‧Direct access line

16‧‧‧ Serial data line

17‧‧‧ Serial clock line

18, 48‧‧‧Switch signal line

40‧‧‧I ² C master control unit

41‧‧‧I ² C slave

42‧‧‧ proximity sensor driver

43‧‧‧Multiplexer

45‧‧‧Direct access line

46‧‧‧ Serial data line

47‧‧‧ Serial clock line

51, 61‧‧‧ mobile phones

62‧‧‧TV

V _DD ‧‧‧ power supply

S31~S33, S71~S74‧‧‧ Step procedure

1 is a block diagram of a first embodiment of an optical sensing device of the switchable mode of operation of the present invention.

2A and 2B are schematic views of a first embodiment of the optical sensing device of the switchable operation mode of the present invention.

Figure 3 is a flow diagram of a first embodiment of an optical sensing device of the switchable mode of operation of the present invention.

Figure 4 is a circuit diagram of a second embodiment of the optical sensing device of the switchable mode of operation of the present invention.

Figure 5 is a schematic illustration of a third embodiment of the optical sensing device of the switchable mode of operation of the present invention.

Figure 6 is a schematic illustration of a fourth embodiment of an optical sensing device of the switchable mode of operation of the present invention.

Figure 7 is a flow chart showing a method of controlling the operation mode of the switching optical sensing device of the present invention.

Embodiments of the optical sensing device and the control method thereof according to the switchable operation mode of the present invention will be described below with reference to the related drawings. For ease of understanding, the same components in the following embodiments are denoted by the same reference numerals. Description.

Please refer to FIG. 1 , which is an optical sensing device of the switchable operation mode of the present invention. A block diagram of the first embodiment. As shown, the optical sensing device 1 includes a sensing device driver 12, a multiplexer 13, an infrared light emitting diode 14, a direct access line 15, and a switching signal line 18.

In the normal operating mode, the multiplexer 13 communicates the output 133 with the first wheel-in terminal 131. The master device transmits the serial data to the slave device 11 through the Serial Data Line (SDA), and then passes through the sensing device driver 12, and then passes through the multiplexer. 13 is transmitted to the infrared light emitting diode 14. At the same time, the master device transmits the clock signal to the slave device 11 through the serial clock line 16 (SCK). Therefore, the sensing device driver 12 can operate the LED 26 according to each of the above signals to perform a general photo sensing operation.

The master device and the slave device 11 can use an Inter-Integrated Circuit (I ² C) communication protocol or a System Management Bus (SMBUS) communication protocol.

The optical sensing device 11 further includes a direct access line 15. When the serial pulse signal is stopped and enters the direct access mode (Direct Access Mode), in order to allow the user to control the infrared light-emitting diode 14 by directly inputting the signal, the serial clock line 17 also needs to be stopped. The clock signal 102 is transmitted. When the slave device 11 detects that the signal of the pulse line 17 is stopped, the switching signal line 18 transmits a switching signal to the multiplexer 13 to connect the output terminal 133 with the second input terminal 132. At this time, the multiplexer 13 has been switched by the sensing device driver 12 to the direct access line 115. In this way, the user can directly input the signal to control the infrared light-emitting diode 14. In practical applications, the serial clock line 17 can be grounded or the serial clock line 17 can be connected to the power supply (Vcc) to fix the voltage of the serial clock line 12 to the power supply voltage V _DD or zero. Stop transmitting the clock signal 102.

If the user wants to return the optical sensing device 1 to the normal operation mode, the slave device 11 can be controlled to switch the direct access mode to the normal operation mode by inputting an external command. In addition, the user can retransmit the clock signal 102 by driving the serial clock pulse line 12. When the slave device 11 senses the clock signal 102 of the plurality of clock cycles, the signal line 18 is transmitted through the switching signal line 18. The switching signal is transmitted to the multiplexer 13, and the direct access mode is switched to the normal operation mode.

When the user inputs an external command to switch the optical sensing device 1 to the normal operation mode, the slave device 11 must receive the complete command signal of the external command to transmit the switching signal to the multiplex through the switching signal line 18. The device 13 enables the optical sensing device to return to the normal mode of operation. At the same time, part of the external command is transmitted through the infrared light-emitting diode 14, and thus an unrecognizable signal is generated. Of course, the user can also switch the serial clock pulse 17 to cause the slave device 11 to detect the signal of the serial pulse line 17 having several timing cycles, so that the user can switch to the normal operation mode.

Therefore, the concept proposed by the present invention can be utilized in any optical sensing device having an infrared light emitting diode. For example, a proximity sensor or the like, by switching the operation mode of the optical sensing device, enables the optical sensing device to perform other different functions in addition to performing general light sensing operations.

For example, a proximity sensor having the structure of the present invention is disposed in a smart phone, and can be used as a bar code generator or a remote controller through software control. use.

Please refer to FIG. 2A, which is a schematic diagram of a first embodiment of an optical sensing device of the switchable operation mode of the present invention. As shown in the figure, when the user inputs an instruction to switch the optical sensing device to the direct access mode, the infrared light emitting diode can be directly controlled via the serial data line (SDA). When the user inputs an instruction to switch the optical sensing device back to the normal operating mode, the optical sensing device can return to the normal operating mode because the slave device must receive the complete command signal. Some of the command content is transmitted through the infrared light-emitting diode, so the infrared light-emitting diode emits a meaningless signal at this time.

Please refer to FIG. 2B, which is a schematic diagram of a first embodiment of an optical sensing device of the switchable operation mode of the present invention. In this embodiment, the user switches the serial pulse line to generate a plurality of timing signals, and when the slave receives the signal, the optical sensing device can be switched to the normal operation mode.

Please refer to FIG. 3, which is a flow chart of the first embodiment of the optical sensing device of the switchable operation mode of the present invention.

In step S31, the main control device transmits the serial data and the pulse signal to the slave device through the serial data line and the serial clock line in the normal operation mode to control the infrared light emitting diode through the sensing device driver. The body performs light sensing work.

In step S32, the external control device accepts an external command to switch the multiplexer from the sensing device driver to the direct access line, and grounds the serial clock line to enter the direct access mode.

In step S33, an external command is received by the master device to directly control the infrared light emitting diode.

Please refer to FIG. 4, which is a circuit diagram of a second embodiment of the optical sensing device of the switchable operation mode of the present invention. In this embodiment, the proximity sensor 4 is disposed on the handset. The proximity sensor 4 includes an internal integrated circuit (I ² C) slave device 41, a proximity sensor driver 42, a multiplexer 43, an infrared light emitting diode 44, and a switching signal line 48.

Similarly, when the proximity sensor 4 performs a light sensing operation in the normal operation mode, the multiplexer 43 communicates the output terminal 433 with the first input terminal 431. The serial data is transmitted by the I ² C master device 40 via the serial data line 46 to the I ² C slave device 41. At the same time, the I ² C master device 40 transmits the clock signal to the I ² C slave device 41 via the serial clock line 47. The proximity sensor driver 42 can operate the infrared light emitting diode 44 according to the above signals, so that the proximity sensor 4 can perform normal light sensing work.

When the user of the mobile phone wants to use the proximity sensor 4 to perform different functions, the normal operation mode is switched to the direct access mode by inputting an instruction via the I ² C master device 40. At this time, the serial clock line 47 is grounded, and when the proximity sensor driver 42 detects that the signal of the serial line pulse 47 is stopped, the switching signal is transmitted to the multiplexer 43 through the switching signal line 48, and the multiplexer 43 will The proximity sensor driver 42 is switched to the direct access line 45. In this way, the user can directly control the infrared illuminating diode 44.

Please refer to FIG. 5, which is a schematic diagram of a third embodiment of the optical sensing device of the switchable operation mode of the present invention. As shown, the user wants to use the proximity sensor 5 of the handset 51 as a barcode generator. The user inputs an instruction to activate the function of the barcode generator of the mobile phone. The barcode stored in the mobile phone 5 can be converted into a digital signal corresponding to the black and white stripes of the barcode by using the software, and the proximity sensor 5 sends a corresponding light and dark signal according to the digital signal. In this way, the proximity sensor 5 of the mobile phone 51 can be used as a barcode generator.

Please refer to FIG. 6 , which is a schematic diagram of a fourth embodiment of the optical sensing device of the switchable operation mode of the present invention. As shown, the user wants to use the proximity sensor 6 of the handset 61 as a remote control to control the television 62. The user first switches the operation mode of the proximity sensor 6 to the direct access mode. In this case, the infrared light emitting diode of the proximity sensor 6 can be controlled by the software to simulate the same optical signal as the infrared remote control. Mobile phones can also be used as infrared remote controls that are commonly found on the market.

Although the foregoing description of the method of controlling the operation mode of the switching photosensor of the present invention has been described in the course of explaining the photosensor of the switchable operation mode of the present invention, for the sake of clarity, the following is still A detailed description of the flow chart is shown.

Please refer to FIG. 7 , which is a flow chart of a method for controlling the operation mode of the switching optical sensing device of the present invention.

In step S71, the serial data line is directly connected to the infrared light emitting diode via the multiplexer by the direct access line.

In step S72, the main control device transmits the signal to the slave device through the serial data line and the serial clock line when in the normal operation mode, and controls the infrared light emitting diode to perform the light sense through the sensing device driver. Test work.

In step S73, an external command is received via the master device, the multiplexer is switched from the sensing device driver to the direct access line, and the serial clock transmission signal is stopped to enter the direct access mode.

In step S74, the infrared light-emitting diode is directly controlled by the master device receiving an external command.

Detailed description of the control method of the operation mode of the switching optical sensing device of the present invention The embodiment has been described above in connection with the optical sensing device of the switchable operation mode of the present invention, and will not be repeatedly described herein for the sake of brevity.

In summary, the optical sensing device of the switchable operation mode of the present invention and the control method thereof can enable the optical sensing device to perform the work of the light sensing device by switching the operation mode of the optical sensing device. For other uses, it is extremely practical. On the other hand, the present invention does not require the addition of too many additional circuit components in the optical sensing device, so that the purpose of switching the operation mode of the optical sensing device can be achieved at a low cost, and thus is very efficient. It can be seen that the present invention has achieved the desired effect under the prior art, and is not familiar with the skill of the artist, and its progressiveness and practicability have been met with the patent application requirements.提出 Submit a patent application in accordance with the law, and ask your bureau to approve the application for this invention patent, in order to encourage creation, to the sense of virtue.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1‧‧‧Optical sensing device

11‧‧‧Driver

12‧‧‧Sensor device driver

13‧‧‧Multiplexer

131‧‧‧ first input

132‧‧‧second input

133‧‧‧output

14‧‧‧Infrared light-emitting diode

15‧‧‧Direct access line

16‧‧‧ Serial data line

17‧‧‧ Serial clock line

18‧‧‧Switch signal line

V _DD ‧‧‧ power supply

Claims (14)

The optical sensing device of the switchable operation mode comprises: an infrared light emitting diode emitting infrared light; a multiplexer having an output end, a first input end and a second input end, the output The end is connected to the infrared illuminating diode; a sensing device driver is coupled to the first input end of the multiplexer and a slave device, and the slave device is coupled to the multiplexer The first input end is connected to a master device (Serial Device) by a serial data line (SDA) and a serial clock line (SCK); The access line connects the second input end of the multiplexer directly to the serial data line; wherein, when in a normal mode, the multiplexer connects the output end to the first input end, And causing the main control device to transmit the signal to the slave device via the serial data line and the serial clock line according to an external command, so that the sensing device driver controls the infrared light emitting diode to perform a light sensing operation; When in a direct access mode, the multiplex The output terminal communicates with the second input terminal, so that the multiplexer is switched from the sensing device driver direct access to the line, received by the master device directly controls the external command infrared light emitting diode. The optical sensing device of the switchable operation mode according to the first aspect of the invention, wherein when the slave device detects that the signal of the pulse transmission is stopped, switching to the direct access mode. The optical sensing device of the switchable operation mode of claim 2, wherein when the slave device detects that the voltage of the pulse line is fixed to the power supply voltage (V _DD ) or zero, the slave device determines The serial clock transmission signal stops. The optical sensing device of the switchable operation mode according to claim 1, wherein the external control device receives an external command to drive the serial clock to retransmit the signal, and the slave device senses the complete When the command signal is input by the serial clock line, the direct access mode is switched to the normal operation mode. The optical sensing device of the switchable operation mode according to claim 1, wherein when the slave device senses that the signals of the plurality of timing cycles are input by the serial clock line, the direct storage is performed. The mode is switched to the normal mode of operation. The optical sensing device of the switchable operation mode according to claim 1, wherein the master device and the slave device use an Inter-Integrated Circuit (I ² C) communication protocol or system. Manage the System Management Bus (SMBUS) protocol. The optical sensing device of the switchable operation mode according to claim 1, wherein the optical sensing device is a Proximity Sensor. A control method for switching an operation mode of an optical sensing device includes the steps of: connecting a second input end of a multiplexer directly to a serial data line by using a direct access line; using a master control device, When in a normal operation mode, one output end of the multiplexer is connected to a first input end, and then the signal is transmitted through the serial data line and the serial pulse line to a slave device to enable a sensing The device driver controls an infrared light emitting diode to perform a light sensing operation; receiving an external command via the main control device, causing the multiplexer to communicate the output end with the second input end, so that the multiplexer is sensed by the sensing Device driver switches to the direct access a line to enter a direct access mode; and the external control unit receives the external command to directly control the infrared light emitting diode. The method for controlling the operation mode of the switchable optical sensing device according to claim 8 further includes the following steps: when the signal of the pulse transmission is stopped when the sensing device driver detects the serial port, Switch to this direct access mode. The control method for switching the operation mode of the optical sensing device according to claim 9, wherein when the slave device detects that the voltage of the pulse line is fixed to the power supply voltage (V _DD ) or zero, It is determined that the serial pulse transmission signal stops. The control method for switching the operation mode of the optical sensing device according to claim 8 further includes the following steps: receiving an external command via the main control device to drive the serial clock retransmission signal, the slave device When it is sensed that the complete command signal is input from the serial clock line, the direct access mode is switched to the normal operation mode, and a switching signal is transmitted to the multiplexer through a switching signal line. The control method for switching the operation mode of the optical sensing device according to claim 8 , further comprising the step of: sensing, by the slave device, the signal of the plurality of timing cycles by the serial clock line input When the direct access mode is switched to the normal operation mode. The control method for switching an operation mode of an optical sensing device according to claim 8, wherein the master device and the slave device use an internal integrated circuit communication protocol or a system management bus bar communication protocol. The control method for switching an operation mode of an optical sensing device according to claim 8, wherein the optical sensing device is a proximity sensor.