US20140321700A1 - Light sensing module and system - Google Patents

Light sensing module and system Download PDF

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US20140321700A1
US20140321700A1 US14/106,835 US201314106835A US2014321700A1 US 20140321700 A1 US20140321700 A1 US 20140321700A1 US 201314106835 A US201314106835 A US 201314106835A US 2014321700 A1 US2014321700 A1 US 2014321700A1
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light
sensing module
light sensing
sensor
control unit
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Peng-Han Zhan
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Dyna Image Corp
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Lite On Semiconductor Corp
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Definitions

  • the present invention relates to a light sensing module and system, and more particularly, to a light sensing module and system capable of performing image sensing and object identification.
  • sensing devices Since mobile devices are equipped with diversified functions, various sensing devices have to be utilized for sensing peripheral environments in order to perform corresponding applications. For example, when a user uses the photographing functions, face recognition techniques are often utilized for focus. When the user plays a motion sensing game, subtle sensing devices are required to perform gesture recognition or object identification. With advancements in three dimensional (3D) display technology, a mobile device needs more complicated sensing devices to perform 3D image sensing and processing. Each sensing device in the current mobile device has a distinctive sensing function, however, and needs to be operated separately. Presently, there is no available sensing system which is capable of integrating various types of sensing devices. Thus, there is a need for improvement over the prior art.
  • the present invention discloses a light sensing module used in a light sensing system.
  • the light sensing system is incorporated with a processor.
  • the light sensing module comprises at least one first light source, for emitting light; at least one first light sensor, for sensing the light emitted by the first light source, light reflected by an ambient object or ambient light, in order to obtain a sensing result; a control unit, for performing image detecting and object identification or ambient light sensing by computing according to the sensing result, and generating a computational result; and at least one interrupt driver, for sending an interrupt signal to the processor, in order to notify the processor to receive the computational result; wherein the processor disposes a type and a number of the first light sensor, and configures the control unit accordingly, so that the control unit performs computation on the sensing result to generate the computational result.
  • the present invention further discloses a light sensing system.
  • the light sensing system comprises a processor; and at least one light sensing module.
  • One of the light sensing modules comprises at least one first light source, for emitting light; at least one first light sensor, for sensing the light emitted by the first light source, light reflected by an ambient object or ambient light, in order to obtain a sensing result; a control unit, for performing image detecting and object identification or ambient light sensing by computing according to the sensing result, and generating a computational result; and at least one interrupt driver, for sending an interrupt signal to the processor, in order to notify the processor to receive the computational result; wherein the processor disposes a type and a number of the first light sensor, and configures the control unit accordingly, so that the control unit performs computation on the sensing result to generate the computational result.
  • FIG. 1 is a schematic diagram of a light sensing module according to an embodiment of the present invention.
  • FIG. 2A is a schematic diagram of a general light sensing system.
  • FIG. 2B is a schematic diagram of a light sensing module according to an embodiment of the present invention.
  • FIG. 3A is a schematic diagram of a general 3D image sensing system.
  • FIG. 3B is a schematic diagram of a light sensing system according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a light sensing system according to an embodiment of the present invention.
  • FIG. 1 is a schematic diagram of a light sensing module 10 according to an embodiment of the present invention.
  • the light sensing module 10 includes light sources 102 _ 1 - 102 _X, light sensors 104 _ 1 - 104 _M, light source ports 106 _ 1 - 106 _Y, light sensor ports 108 _ 1 - 108 _N, a control unit 110 , interrupt drivers 112 _ 1 - 112 _Z, a synchronization device 114 , a light sensor interface 116 and an I/O interface 118 .
  • the light sensing module 10 is electrically connected to a processor 120 , which controls the operations of the light sensing module 10 .
  • the light sources 102 _ 1 - 102 _X are utilized for emitting light. The light may be reflected when reaching an object, and object identification may be performed accordingly.
  • the light source ports 106 _ 1 - 106 _Y which are externally connected to external light sources 130 _ 1 - 130 _Y, respectively, may drive the external light sources 130 _ 1 - 130 _Y to emit light.
  • the control unit 110 may dispose the type and number of the light sources 102 _ 1 - 102 _X and the light source ports 106 _ 1 - 106 _Y according to configurations of the processor 120 .
  • the user may dispose more commonly used light sources as the light sources 102 _ 1 - 102 _X, and dispose less used light sources as the external light sources 130 _ 1 - 130 _Y.
  • the external light sources 130 _ 1 - 130 _Y are externally connected to the light source ports 106 _ 1 - 106 _Y only when they are needed, in order to save on area and cost of the system.
  • the light sensors 104 _ 1 - 104 _M are utilized for detecting the light emitted by the light sources 102 _ 1 - 102 _X or the external light sources 130 _ 1 - 130 _Y, as well as light reflected by peripheral objects or ambient light, in order to obtain a sensing result.
  • the light sensor ports 108 _ 1 - 108 _N which are externally connected to the external light sensors 140 _ 1 - 140 _N, respectively, may be utilized for transmitting data detected by the external light sensors 140 _ 1 - 140 _N.
  • the processor 120 may arbitrarily dispose the type and number of the light sensors 104 _ 1 - 104 _M and the number of the light sensor ports 108 _ 1 - 108 _N. According to system requirements, the user may dispose more commonly used light sensors as the light sensors 104 _ 1 - 104 _M, and dispose less used light sensors as the external light sensors 140 _ 1 - 140 _N.
  • the external light sensors 140 _ 1 - 140 _N are externally connected to the light sensor ports 108 _ 1 - 108 _N only when they are needed, in order to save on area and cost of the system.
  • the light sources 102 _ 1 - 102 _X or the external light sources 130 _ 1 - 130 _Y may emit light, and the light sensors 104 _ 1 - 104 _M and the external light sensors 140 _ 1 - 140 _N detect the reflected light. Accordingly, the light sensors 104 _ 1 - 104 _M and the external light sensors 140 _ 1 - 140 _N may detect locational information such as the movement or distance of the object, in order to perform the object identification.
  • the light sources 102 _ 1 - 102 _X and the external light sources 130 _ 1 - 130 _Y may be composed of various materials or elements which are able to emit light, e.g.
  • the light sources 102 _ 1 - 102 _X or the external light sources 130 _ 1 - 130 _Y may be realized by infrared LEDs, and thus the corresponding light sensors 104 _ 1 - 104 _M or external light sensors 140 _ 1 - 140 _N have to be implemented as infrared sensors for performing the detection.
  • the light sensors 104 _ 1 - 104 _M and the external light sensors 140 _ 1 - 140 _N may include a proximity sensor, ambient light sensor, color sensor, and image sensor, etc. Different types of detectors may be implemented for different applications.
  • the control unit 110 may integrate the sensing results of various light sensors and perform the image sensing, object identification or ambient light sensing via computation in order to generate a computational result.
  • the light sensors 104 _ 1 - 104 _M and the external light sensors 140 _ 1 - 140 _N may include a proximity sensor and an ambient light sensor.
  • the ambient light sensor which may be utilized for detecting the location of a user's hand, may obtain movement information of the hand via the locations detected at different time points.
  • the proximity sensor which may be utilized for detecting the distance between the hand and the device, may obtain information related to proximity movement of the hand via the distances detected at different time points.
  • the control unit 110 may combine the sensing results generated from the ambient light sensor and the proximity sensor and obtain the accurate location and movement of the gesture via computation, in order to accomplish the gesture recognition.
  • the processor 120 may configure the light sensing module 10 to perform 3D image sensing, and thus the light sensing module 10 may include two light sensors 104 _L and 104 _R located in different locations for simulating the gaze of a user's left eye and right eye, respectively.
  • the control unit 110 obtains the sensing results from the light sensors 104 _L and 104 _R, respectively, and then performs follow-up operations and processing by simulating the visual processing analogous to human eyes, in order to generate the computational results.
  • the interrupt drivers 112 _ 1 - 112 _Z are utilized for sending interrupt signals to the processor 120 , in order to notify the processor 120 to receive the computational results.
  • the processor 120 may be a central processing unit (CPU), a microprocessor, or a micro control unit (MCU), etc.
  • the processor 120 may control the operations of the light sensing system and the light sensing module, and may also be utilized for controlling the entire operations of the mobile device. In such a condition, the processor 120 may not dispose all resources for processing data of the light sensing system or the light sensing module.
  • the light sensing module 10 may only notify the processor 120 to read the computational results when the computational results are generated by the control unit 110 .
  • the interrupt drivers 112 _ 1 - 112 _Z may be utilized for sending interrupt signals.
  • the processor 120 may learn that the control unit 110 obtains a specific computational result and dispose resources for receiving the result. If the processor 120 does not receive any interrupt signals, the processor 120 may dispose the resources for other devices, and thus may not need to keep detecting or monitoring the control unit 110 .
  • the resources of the processor 120 may be utilized more efficiently. For example, when gesture recognition is performed, the system is triggered due to variations in the gesture; hence the interrupt drivers 112 _ 1 - 112 _Z may need to send an interrupt signal to notify the processor 120 to receive data only when the gesture varies.
  • the synchronization device 114 of the light sensing module 10 is utilized for connecting other light sensing modules.
  • alight sensing system may include at least one light sensing module, each of which has light sources and light sensors.
  • the processor 120 has to execute operations corresponding to the sensing results generated by these light sensing modules.
  • the synchronization device 114 may be connected to other light sensing modules and utilized for synchronizing the output data generated from each light sensing module, so that the control device 110 may effectively integrate the output data of each light sensing module.
  • the light sensors for simulating the left eye and the right eye may be implemented by two different light sensing modules.
  • the light sensing system may integrate the data generated from these two light sensors.
  • the synchronization device then performs synchronization and outputs the data to the processor 120 , in order to achieve 3D image sensing.
  • the light sensor interface 116 and the I/O interface 118 which are utilized as connection interfaces of the light sensing module 10 , are electrically connected between the control unit 110 and each device of the light sensing module 10 . As shown in FIG. 1 , one terminal of the light sensor interface 116 is connected to the control unit 110 , and the other terminal of the light sensor interface 116 is connected to the light sensors 104 _ 1 - 104 _M and the light sensor ports 108 _ 1 - 108 _N.
  • the light sensor interface 116 provides a medium for signal transmission so that the control unit 110 may control the operations of the light sensors 104 _ 1 - 104 _M and the external light sensors 140 _ 1 - 140 _N and receive the sensing results generated from the light sensors 104 _ 1 - 104 _M and the external light sensors 140 _ 1 - 140 _N.
  • One terminal of the I/O interface 118 is connected to the control unit 110 , and the other terminal of the I/O interface 118 is connected to the light sources 102 _ 1 - 102 _X, the light source ports 106 _ 1 - 106 _Y, the interrupt drivers 112 _ 1 - 112 _Z and the synchronization device 114 .
  • the I/O interface 118 provides a medium for signal transmission so that the control unit 110 may drive the operations of the light sources 102 _ 1 - 102 _X and the light source ports 106 _ 1 - 106 _Y, and control the interrupt drivers 112 _ 1 - 112 _Z to send interrupt signals and control the synchronization operations of the synchronization device 114 .
  • the implementation of the light sensor interface 116 and the I/O interface 118 described here is only one of various embodiments of the connection interface.
  • the control unit 110 may be connected to other devices through other types of interfaces or in other manners, and should not be limited herein.
  • the processor 120 may dispose the type and number of the light sensors 104 _ 1 - 104 _M and the external light sensors 140 _ 1 - 140 _N according to system requirements, and configure various parameters of all light sensors such as resolution and sensing frequency.
  • the processor 120 controls the control unit 110 to perform corresponding settings such as the strength of output signals, the type of output signals and the strength of driving signals according to the above configurations.
  • the control unit 110 may distribute the types and numbers of the light sources 102 _ 1 - 102 _X and the external light sources 130 _ 1 - 130 _Y.
  • the control unit 110 then timely drives the light sources 102 _ 1 - 102 _X or the external light sources 130 _ 1 - 130 _Y for corresponding applications.
  • the control unit 110 may perform computation or analysis on the sensing results according to the above settings, in order to convert the sensing results into computational results which will be outputted to the processor 120 .
  • the sensing results generated by the light sensors 104 _ 1 - 104 _M or the external light sensors 140 _ 1 - 140 _N may be the location of the user's hand at each time point, and the computational results generated via the computation or analysis of the control unit 110 may be meaningful gestures, such as zooming, page turning and moving.
  • the present invention may integrate various image sensors and light sensors, in order to implement various applications such as gesture recognition, face recognition, 3D imaging, information security and interactive games.
  • Those skilled in the art can make modifications and alternations accordingly.
  • the types and numbers of the abovementioned light sources 102 _ 1 - 102 _X, external light sources 130 _ 1 - 130 _Y, light sensors 104 _ 1 - 104 _M and external light sensors 140 _ 1 - 140 _N may arbitrarily be adjusted according to system requirements.
  • such modules or devices may also be adjusted dynamically according to the variations of the sensing mode.
  • the light sensing module 10 may be realized in different ways.
  • the light sensing module 10 may be realized by a system on a chip (SoC), where the cost of the light sensing modules may be significantly reduced when the light sensing modules are integrated into a single chip.
  • SoC system on a chip
  • alight sensing system having multiple light sensing modules may be utilized, and each light sensing module may be realized by an SoC.
  • the light sensing module 10 may be realized inside any type of integrated circuit (IC) packages, and is not limited herein.
  • FIG. 2A is a schematic diagram of a general light sensing system 20 A.
  • the light sensing system 20 A includes light sensors 202 , 204 and light sources 206 , 208 .
  • the light sensing system 20 A is electrically connected to a processor 220 , which controls the operations of the light sensing system 20 A.
  • the light sensor 202 and the light source 206 may co-operate to perform various light sensing functions, and the light sensor 204 and the light source 208 may also co-operate to perform light sensing functions.
  • the present invention may integrate various light sensors and light sources into a light sensing module. Please refer to FIG.
  • FIG. 2B is a schematic diagram of a light sensing module 20 B according to an embodiment of the present invention.
  • the light sensors 202 and 204 may be integrated into the light sensing module 20 B.
  • the light sources 206 and 208 are utilized for emitting light having the same frequency, only one light source (e.g. the light source 206 ) is needed in the light sensing module 20 B to realize light sensing functions of both light sensors 202 and 204 .
  • the integration of the light sensing module 20 B at least two benefits can be achieved.
  • the number of light sources may be reduced, which reduces the area and cost of the system.
  • the processor 220 may not need to process the operations of multiple light sensors simultaneously.
  • the processor 220 may only need to communicate with the control unit, which significantly reduces the load of the processor 220 .
  • the light sensing module 20 B may also be realized by an SoC, which further reduces the cost.
  • FIG. 3A is a schematic diagram of a general 3D image sensing system 30 A.
  • the 3D image sensing system 30 A includes light sensors 302 , 304 and light sources 306 , 308 .
  • the 3D image sensing system 30 A is electrically connected to a processor 320 , which controls the operations of the 3D image sensing system 30 A.
  • the light sensor 302 and the light source 306 may co-operate to simulate the gaze of a user's left eye
  • the light sensor 304 and the light source 308 may co-operate to simulate the gaze of a user's right eye.
  • the processor 320 is electrically connected to both the light sensors 302 and 304 , in order to perform the synchronization between the light sensors 302 and 304 .
  • the light sensing modules may be synchronized with each other via a synchronization device.
  • FIG. 3 B is a schematic diagram of a light sensing system 30 B according to an embodiment of the present invention.
  • different light sensing modules may be utilized for simulating the gaze of the user's left eye and right eye, respectively.
  • the light sensing system 30 B includes light sensing modules 300 and 310 .
  • the light sensor 302 and the light source 306 may co-operate to simulate the gaze of the user's left eye.
  • the light sensing module 300 further includes a synchronization device 340 , which is utilized for performing synchronization.
  • the light sensor 304 and the light source 308 may co-operate to simulate the gaze of the user's right eye.
  • the light sensing module 310 further includes a synchronization device 350 , which is utilized for performing synchronization.
  • the synchronization device 340 is electrically connected to the synchronization device 350 , in order to transmit synchronizing signals between the two for performing synchronization.
  • the synchronization may be performed inside the light sensing system 30 B, so that the processor 320 may not have to process the synchronization between different light sensors. This significantly reduces the load of the processor 320 .
  • FIG. 4 is a schematic diagram of alight sensing system 40 according to an embodiment of the present invention.
  • the light sensing system 40 includes a light sensing module 400 , which is utilized for performing face recognition.
  • the light sensing module 400 includes a light sensor 402 , a light source 404 and a light source port 406 .
  • the light sensing module 400 is electrically connected to a processor 420 , which controls the operations of the light sensing module 400 .
  • the light sensing modules of the present invention may be selectively connected to external light sensors or external light sources via light sensor ports or light source ports, which increases the flexibility in the usage of light sensors or light sources.
  • a greater light source should sometimes be utilized; hence, a larger light source 408 may be externally connected to the light source port 406 , wherein the light source 408 may be turned on when in use, and turned off or removed when not in use. As a result, the flexibility of using the light sources may be increased. When the larger or less used light source 408 is externally connected, the size and cost of the light sensing module 400 may also be reduced.
  • the embodiment of the present invention may also realize wider applications such as information security or games.
  • the user may predefine a specific gesture as a password to turn on a mobile device, or utilize more complex procedures such as eyeball identification or fingerprint identification to perform information security.
  • the gestures and actions of the user may be detected to achieve the interaction.
  • the light sensing module of the present invention may also be considered as a human-based input interface, e.g. the user may use gestures to simulate movements of a mouse. Any types of applications related to devices or elements for image identification or optical sensing may all be included in the light sensing modules or light sensing systems of the present invention, and is not limited herein.
  • each sensing device in the mobile device has a distinctive sensing function and is operated separately.
  • the present invention provides a light sensing module and system, which are capable of integrating various image sensors and light sensors, in order to perform applications such as gesture recognition, face recognition, 3D display, information security and interactive games, etc.
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US9677930B2 (en) 2017-06-13
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US20140320407A1 (en) 2014-10-30
US20140319328A1 (en) 2014-10-30
US9297695B2 (en) 2016-03-29
US9006850B2 (en) 2015-04-14
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CN104123179A (zh) 2014-10-29
US9377354B2 (en) 2016-06-28
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US20140319348A1 (en) 2014-10-30
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