Patent Publication Number: US-2023132771-A1

Title: Surface-emitting laser device and distance measurement device having same

Description:
TECHNICAL FIELD 
     An embodiment of the invention relates to a surface-emitting laser device and a distance measurement device having the same. 
     BACKGROUND ART 
     A sensor for depth determination based on a semiconductor laser has been developed. One technique for using these sensors is the time-of-flight technique. The time-of-flight technique requires accurate detection of the delay between the transmitted and received light pulses to measure the distance. In general, the delay is detected based on the time difference between the time of the transmitted light pulse and the time of the received light pulse (i.e., the time-delay between the transmitted light pulse and the received light pulse), and the distance to the object may be determined based on the delay (e.g., since the speed of light is known). Images may be generated based on determining distances for various locations in the field of view. A light source generating a light pulse of a specific wavelength is capable of oscillating in a single longitudinal mode of a narrow spectrum, and has a high coupling efficiency due to a small radiation angle of the beam. Research into a technology for manufacturing a light source matrix by patterning such a light source in the form of a two-dimensional array is active. By irradiating light pulses to an object in the form of a two-dimensional array and analyzing the reflected light pulses through a processor, a three-dimensional image and distance of the object can be extracted. 
     DISCLOSURE 
     Technical Problem 
     An embodiment of the invention provides a surface-emitting laser device having different regions or areas of a plurality of light emitting portions that irradiate light toward an object. An embodiment of the invention provides a surface-emitting laser device having a first light emitting portion in the entire region and a second light emitting portion in a partial region for irradiating light toward the object. An embodiment of the invention may provide a surface-emitting laser device having a first light emitting portion that emits light through the entire region and a second light emitting portion that emits light from a center region. An embodiment of the invention may provide a surface-emitting laser device having a plurality of light emitting portions that irradiate light of different angles of view toward the object. 
     An embodiment of the invention may provide a surface-emitting laser device in which a connection portion or a bridge electrode of the second emitter is disposed to overlap the connection portion of the first emitter to connect the second emitter and the second pad. An embodiment of the invention may provide a surface-emitting laser device in which a connection portion or a bridge electrode is extended through the outside of the protruding portions of the first and second emitters in order to connect the second emitter and the second pad. An embodiment of the invention may provide a surface-emitting laser device having a plurality of light emitting portions that irradiate light of different angles of view toward a target. An embodiment of the invention may provide a surface-emitting laser device having a plurality of light emitting portions and a distance measurement device having the same. 
     Technical Solution 
     A surface-emitting laser device according to an embodiment of the invention includes a first region in which a plurality of first emitters are arranged; and a second region in which a portion of the plurality of first emitters and a plurality of second emitters are arranged, wherein an area of the second region is smaller than an area of the first region, and the second region is disposed in a center region of the first region, and the first emitter and the second emitter may be driven separately. 
     According to an embodiment of the invention, the number of the second emitters disposed in the second region may be smaller than the number of the first emitters disposed in the first region. a first pad disposed outside the first region in which the first emitters are arranged and electrically connected to the plurality of first emitters; and a second pad is disposed outside the first region and electrically connected to the second emitters may include. A pitch between adjacent first emitters in the first region may be the same as a pitch between adjacent second emitters in the second region. The second region may be arranged with the second emitters, and pitches of the first and second emitters in the first region and the second region may be the same. 
     According to an embodiment of the invention, a first insulating layer disposed between the first connection portion and the second connection portion on the second region may include, wherein the second pad is disposed on a portion of an outside of the first region and has an area smaller than the area of the first pad, and is electrically connected to the plurality of second emitters, wherein each of the first and second emitters may include a light emitting layer disposed on a lower first reflective layer, respectively, an oxide layer having an opening on the light emitting layer, a second reflective layer on the oxide layer, and a passivation layer on the second reflective layer. 
     According to an embodiment of the invention, the first emitter includes a first contact portion in contact with the second reflective layer of the first emitter, and a first electrode including the first connection portion extending from the first contact portion to the passivation layer, wherein the second emitter may include a second contact portion in contact with the second reflective layer of the second emitter, and the second connection portion extending from the second contact portion to the passivation layer. 
     According to an embodiment of the invention, the second region includes a first flat portion disposed between the protruding portions of the first and second emitters, and the protruding portions of the first and second emitters include the light emitting layer, the oxide layer and the second reflective layer, wherein the first connection portion of the first electrode and the second connection portion of the second electrode may overlap a portion of the first flat portion in a vertical direction. 
     According to an embodiment of the invention, a third region in which a bridge electrode connecting the second electrode to the second pad is disposed between the second region and the second pad, wherein the bridge electrode extends outside the protrusions of the plurality of first emitters disposed in the third region, and the third region includes a second flat portion extending outside of the protruding portion of the first emitter, and the first connection portion of the electrode and the bridge electrode of the second electrode on the second flat portion overlap in a vertical direction, and the first insulating layer is disposed between the upper surface of the first connection portion of the first electrode and the lower surface of the bridge electrode, and a second insulating layer for protecting the outside of the bridge electrode of the electrode may be included. 
     A surface-emitting laser device according to an embodiment of the invention includes a plurality of first emitters disposed in a first region and a second region; a plurality of second emitters disposed in the second region, wherein the second region is included in the first region, has a smaller area than the first region, and may be driven separately the plurality of first emitters and the plurality of emitters, wherein a pitch between the first emitter and the second emitter may be smaller than a pitch between the first emitters. 
     According to an embodiment of the invention, in the second region, the second emitters disposed in the second region may be respectively disposed between the first emitters. A pitch between adjacent first and second emitters in the second region may be ½ of a pitch between adjacent first emitters. Each of the first emitters disposed in the first region includes a first electrode on an upper portion of the first emitter, each of the second emitters disposed in the second region includes a second electrode on an upper portion of the second emitter, and the second electrode of the second emitter may include a bridge electrode connected to the second pad, and the bridge electrode may extend over the first region to the second pad. Each of the first and second emitters includes a lower electrode; a substrate on the lower electrode; a first reflective layer disposed on the substrate; a light emitting layer disposed on the first reflective layer; an oxide layer including an opening and an insulating region on the light emitting layer; a second reflective layer disposed on the oxide layer; and a passivation layer on the second reflective layer, wherein the first electrode or the second electrode may include a contact portion in contact with the second reflective layer and a connection portion extending on the passivation layer. 
     A surface-emitting laser device according to an embodiment of the invention includes: a first light emitting portion in which a plurality of first emitters irradiating light in an infrared region are arranged and have O rows and P columns; at least one second light emitting portion in which a plurality of second emitters for irradiating infrared light are arranged and have M rows and N columns; An area of a second region in which the second emitters are disposed is smaller than an area of a first region, and the number of the second emitters disposed in the second region is smaller than the number of the first emitters disposed in the first region, the second region is disposed in the center region of the first region, the first emitter and the second emitter are driven separately, and O, P, M, N are integers; and have a relationship of O&gt;P&gt;M&gt;N. 
     According to an embodiment of the invention, the first light emitting portion may emit light for a reference angle of view, and the second light emitting portion may emit light for a smaller angle of view than the reference angle of view. The reference angle of view may be greater than or equal to 70 degrees, and the angle of view smaller than the reference angle of view may be less than or equal to 50 degrees. 
     According to an embodiment of the invention, the first emitter and the second emitter are repeatedly driven on/off with a predetermined period, and the driving period of the first emitter at the reference angle of view may be smaller than the driving period of the second emitter at the angle of view smaller than the reference angle of view. An area of the second region may be 30% or less of an area of the first region, and the second region may be disposed in a polygonal shape with respect to the centers of the first and second regions. The second light emitting portion may have the second emitter having a zoom magnification of 2× or more. 
     A distance measurement device according to an embodiment of the invention includes: a light source having the surface-emitting laser device disclosed above; and a light receiving portion configured to receive light scattered or reflected from an object by driving the first or second light emitting portion of the light source to emit light in the irradiated infrared region. 
     Advantageous Effects 
     The surface-emitting laser device according to an embodiment of the invention may reduce the power consumption of the camera module by individually driving the first light emitting portion and the second light emitting portion partially emitting light within the region of the first light emitting portion. According to the surface-emitting laser device according to the embodiment of the invention, by selectively emitting light from a plurality of light emitting portions having different areas, the light emitting portions may be selectively driven according to a zoom function or a measurement distance. According to the surface-emitting laser device according to the embodiment of the invention, there is an effect of selectively emitting light from the first light emitting portion that emits light through the entire region and the second light emitting portion that emits light through the partial or center region. 
     According to the surface-emitting laser device according to the embodiment of the invention, the connection portion or the bridge electrode of the second emitter extends to the outside of the protruding portion part of the first and second emitters, so that the connection resistance is not increased and the operating voltage may be suppressed from increasing. In addition, it is possible to spread the current, thereby improving the operating voltage of the second emitter. In addition, since the connecting portion or the bridge electrode of the second emitter id disposed to overlap the first electrode of the first emitter, light loss may be reduced. 
     The surface-emitting laser device and the distance measurement device having the same according to an embodiment of the invention may have improve reliability. The surface-emitting laser device may be applied as a distance measurement device to a moving object such as a vehicle, a portable terminal, a camera, various information measurement devices, robots, computers, medical devices, home appliances or wearables. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG.  1    is a conceptual diagram illustrating a distance measurement device according to an embodiment of the invention. 
         FIG.  2    is a plan view of a surface-emitting laser device in a light source in the distance measurement device of  FIG.  1   . 
         FIG.  3    is a view illustrating region of the first and second light emitting portions in the surface-emitting laser device of  FIG.  2   . 
         FIG.  4    is an enlarged view of the first light emitting portion and the second light emitting portion of  FIG.  3   . 
         FIG.  5 (A) (B) is diagrams for explaining the operation of the first light emitting portion and the second light emitting portion of  FIG.  3   . 
         FIG.  6    is a modified example of a bridge electrode connected to a second light emitting portion in the surface-emitting laser device of  FIG.  3   . 
         FIG.  7    is a side cross-sectional view taken along line A 1 -A 1  of  FIG.  4   . 
         FIG.  8    is a side cross-sectional view taken along line A 2 -A 2  of  FIG.  4   . 
         FIG.  9    is a side cross-sectional view taken along line A 3 -A 3  of  FIG.  4   . 
         FIG.  10    is a side cross-sectional view taken along line A 4 -A 4  of  FIG.  4   . 
         FIG.  11    is a view for explaining another example of the second light emitting portion in the surface-emitting laser device according to an embodiment of the invention. 
         FIG.  12 (A) -(D) are views for explaining a region according to driving of the second light emitting portion of  FIG.  11   . 
         FIG.  13    is a view illustrating a first light emitting portion and a second light emitting portion of the surface-emitting laser device of  FIGS.  11  and  12   . 
         FIG.  14    is a block diagram of a distance measurement device according to an embodiment of the invention. 
         FIG.  15    is an example of a flowchart of a distance measurement device according to an embodiment of the invention. 
         FIG.  16    is an example of a portable terminal coupled with a distance measurement device according to an embodiment of the invention. 
     
    
    
     BEST MODE 
     Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical spirit of the invention is not limited to some embodiments to be described, and may be implemented in various other forms, and one or more of the components may be selectively combined and substituted for use within the scope of the technical spirit of the invention. In addition, the terms (including technical and scientific terms) used in the embodiments of the invention, unless specifically defined and described explicitly, may be interpreted in a meaning that may be generally understood by those having ordinary skill in the art to which the invention pertains, and terms that are commonly used such as terms defined in a dictionary should be able to interpret their meanings in consideration of the contextual meaning of the relevant technology. Further, the terms used in the embodiments of the invention are for explaining the embodiments and are not intended to limit the invention. In this specification, the singular forms also may include plural forms unless otherwise specifically stated in a phrase, and in the case in which at least one (or one or more) of A and (and) B, C is stated, it may include one or more of all combinations that may be combined with A, B, and C. In addition, in describing the components of the embodiments of the invention, terms such as first, second, A, B, (a), and (b) may be used. Such terms are only for distinguishing the component from other component, and may not be determined by the term by the nature, sequence or procedure etc. of the corresponding constituent element. And when it is described that a component is “connected”, “coupled” or “joined” to another component, the description may include not only being directly connected, coupled or joined to the other component but also being “connected”, “coupled” or “joined” by another component between the component and the other component. In addition, in the case of being described as being formed or disposed “above (on)” or “below (under)” of each component, the description includes not only when two components are in direct contact with each other, but also when one or more other components are formed or disposed between the two components. In addition, when expressed as “above (on)” or “below (under)”, it may refer to a downward direction as well as an upward direction with respect to one element. 
       FIG.  1    is a conceptual diagram illustrating a distance measurement device according to an embodiment of the invention,  FIG.  2    is a plan view of a surface-emitting laser device in a light source in the distance measurement device of  FIG.  1   ,  FIG.  3    is a view illustrating region of the first and second light emitting portions in the surface-emitting laser device of  FIG.  2   ,  FIG.  4    is an enlarged view of the first light emitting portion and the second light emitting portion of  FIG.  3   ,  FIG.  5 (A) (B) is diagrams for explaining the operation of the first light emitting portion and the second light emitting portion of  FIG.  3   ,  FIG.  6    is a modified example of a bridge electrode connected to a second light emitting portion in the surface-emitting laser device of  FIG.  3   ,  FIG.  7    is a side cross-sectional view taken along line A 1 -A 1  of  FIG.  4   ,  FIG.  8    is a side cross-sectional view taken along line A 2 -A 2  of  FIG.  4   ,  FIG.  9    is a side cross-sectional view taken along line A 3 -A 3  of  FIG.  4   , and  FIG.  10    is a side cross-sectional view taken along line A 4 -A 4  of  FIG.  4   . 
     Referring to  FIG.  1   , the distance measurement device  10  may be a sensor that irradiates light for detecting 3D information such as distance information on an object  1  located in front and obtains the irradiated light in real time. Here, the 3D information may include a 3D image or distance information. For example, the distance measurement device  10  may be applied to a portable terminal, an unmanned vehicle, an autonomous vehicle, a robot, a drone, a medical device, and the like. The distance measurement device  10  may include a light detection and ranging (LiDAR) device, a sensing device, or a camera module. 
     The distance measurement device  10  may include one or a plurality of light sources  30  and one or a plurality of light receiving portions  20 . As for the light source  30 , the output light  11  may be irradiated to the object  1 , and the received light  12  reflected from the object  1  may be detected by the light receiving portion  20 . The light source  30  may include an element irradiating light toward the object  1 . The light source  30  may generate and irradiate a sine wave, a ramp wave, a square wave, a pulse wave, or continuous light. The light source  30  may generate and irradiate light of the same wavelength or light of a plurality of different wavelength bands. The light source  30  may output light by performing, for example, amplitude modulation or phase modulation. The light source  30  may emit light in the infrared region. When the light in the infrared region is used, mixing with natural light in the visible region including sunlight may be prevented. However, it is not necessarily limited to the infrared region and may emit light of various wavelength regions. In this case, correction may be required to remove the mixed natural light information. For example, the light source  30  may include a laser light source, but is not limited thereto. The light source  30  may include any one of an edge emitting laser, a vertical-cavity surface emitting laser (VCSEL), and a distributed feedback laser. For example, the light source  30  may include a laser diode. In addition, the light source  30  may be various types of lasers, such as a near-infrared semiconductor laser. According to the needs of the implementation, the light source  30  may be included in another device, and does not necessarily consist of hardware included in the distance measurement device  10 . 
     The light receiving portion  20  may obtain, as the received light  12 , intensity information of the light and distance information from the object  1 . The light intensity information may include intensity values of lights reflected according to a region of the object  1 , and the distance information may indicate a distance between the object  1  and the distance measurement device  10 . The light receiving portion  20  may include a sensor (not shown) and a lens (not shown) therein, and light incident through the lens may be detected through the sensor. 
     The light source  30  is employed in a camera module, for example, a camera module for 3D image sensing. For example, the camera module for 3D image sensing may be a camera capable of capturing depth information of an object. Meanwhile, a separate sensor is mounted for depth sensing of the camera module, and it is divided into two types: a structured light (SL) method and a time of flight (ToF) method. The structured light (SL) method emits a laser of a specific pattern to the subject, and calculates the depth based on the degree of pattern deformation according to the shape of the subject&#39;s surface, and a shooting result of the three-dimensional image is obtained by synthesizing it with the image taken by the image sensor. In contrast, the ToF method measures the time it takes for the laser to reflect off the subject, calculates the depth, and combines it with the image taken by the image sensor to obtain a 3D shooting result. Accordingly, the SL method requires that the laser be positioned very accurately, but the ToF method has an advantage in mass production in that it relies on an improved image sensor, and either one of the SL and ToF methods, or both methods may be employed in one mobile phone. 
     The ToF has a direct/in-direct type, and the indirect type measures the distance using the phase difference between emitted light and received light, modulates the light source of the surface-emitting laser device (VCSEL) and may be driven so that turn on/off is repeated at a predetermined cycle. Here, the pixel of the sensor may include a pixel that is turned on and off in the same period as the light source and a pixel that is turned on/off with a phase difference of 180 degrees. In the in-direct type, in order to measure a distance by detecting a phase difference, a case of 0 and a case of 360 degrees may be recognized as the same distance. For example, the first case in which an object is located right in front of the light source and the second case in which the phase is changed by 360 degrees for the return time of the light because it is far from the light source and the period is the same may be processed and recognized as the same distance. In the first case, the light emitted from the light source may be directly detected by the sensor without a phase difference, and in the second case, the phase difference between the light source and the reflected light received by the sensor becomes 360 degrees, so that the phase difference disappears again. Accordingly, the blinking cycle of the light source and the sensor must be adjusted according to the target distance. In particular, as the distance between the object increases, the blinking cycle may be set longer (the modulation frequency is small). 
     As shown in  FIGS.  1  and  2   , the light source  30  may include a surface-emitting laser device  200  in which a plurality of emitters  201  and  202  are arranged. The surface-emitting laser device  200  may include a plurality of light emitting portions E 1  and E 2  that selectively emit light according to the regions R 1  and R 2 . For example, the surface-emitting laser device  200  may include a first light emitting portion E 1  that emits light in the entire region (e.g., R 1 ) and a second light emitting portion E 2  that emits light in a partial region (e.g., R 2 ). The partial region is a region having a size smaller than the size of the entire region, and may be a center region within the entire region. The surface-emitting laser device  200  may include a first light emitting portion E 1  and/or a second light emitting portion E 2  having different field of view (FOV) and irradiating light. The surface-emitting laser device  200  may include the first light emitting portion E 1  and/or the second light emitting portion E 2  for irradiating light for different zoom functions. 
     Referring to  FIGS.  2  and  3   , the surface-emitting laser device  200  includes a first light emitting portion E 1  and a first pad  101  connected to the first emitters  201  of the first light emitting portion E 1 , a second light emitting portion E 2 , and a second pad  102  connected to the second emitters  202  of the second light emitting portion E 2 . The first light emitting portion E 1  may include the array of the first emitters  201 , and the array of the first emitters  201  may be arranged in a matrix in the first region R 1 . The first region R 1  is the entire region of the surface-emitting laser device  200 , and may have a horizontal length H 1  in the first direction H greater than a vertical length V 1  in the second direction V. Here, the first direction H may be a horizontal direction, a row direction, or a first horizontal direction. The second direction V may be a direction orthogonal to the first direction, and may be a column direction or a second horizontal direction orthogonal to the first horizontal direction. The third direction may be a diagonal direction between the first direction H and the second direction V. The horizontal length H 1  and the vertical length V 1  of the first region R 1  may be provided as a light emitting area for a zoom region of 1× based on a predetermined angle of view FOV. The angle of view due to the light irradiated by the first light emitting portion E 1  or the reference angle of view may be, for example, 70 degrees or more, for example, 80 degrees to 90 degrees. The horizontal length H 1  may be in the range of 1 mm or more, for example, 1.2 mm to 1.5 mm. The vertical length V 1  may be in the range of 0.7 mm or more, for example, 0.7 mm to 1.2 mm. When the ratio of the horizontal length H 1  to the vertical length V 1  is 4:3 or the ratio H 1 :V 1  is a ratio of a:b, a&gt;b has a relationship, wherein a may be greater than one times than the b. 
     The second light emitting portion E 2  includes an array of the second emitters  202 , and the array of the second emitters  202  may be disposed in an area of the second region R 2  smaller than an area of the first region R 1 . The first region R 1  may be a region in which the first emitters  201  are disposed in the entire region. The second region R 2  is a region in which the first emitters  201  and the second emitters  202  are alternately arranged in the center region of the first region R 1 , or the second emitter  202  may be arranged. In the second region R 2 , first emitters  201  and second emitters  202  may be alternately arranged, and each of the second emitters  202  may be disposed between the first emitters  201 . As another example, the second region R 2  may be surrounded by a region in which the second emitter  202  is not disposed among the first region R 1 . Accordingly, the second emitters  202  in the second region R 2  may be arranged in the form of an open looped and/or closed loop by the first region R 1  or the first emitters  201 . Alternatively, the first emitters  201  in the second region R 2  may be disposed in an open loop or/and a closed loop form by the second emitters  201 . 
     Referring to  FIGS.  4  and  3   , the first region R 1  may include a third region R 3 , and the third region R 3  may disposed between the second region R 2  and the second pad  102 . In the second region R 2 , first and second emitters  201  and  202  may be alternately disposed in the first and second directions H and V. In the first region R 1  and/or the third region R 3 , the first emitters  201  may be arranged at the same pitch D 1  in the first direction H or/and the second direction V. In the first region R 1  and/or the third region R 3 , the separation distance D 6  of the first emitters  201  in the first direction H and/or the second direction V may be greater than the separation distance D 4  in the diagonal direction. The pitch D 1  between the first emitters  201  in the first and second directions H and V may be greater than the pitch D 3  of the first emitters  201  in the oblique direction (i.e., the third direction). The pitch D 1  between the first emitters  201  adjacent in the first region R 1  in the first and second directions H and V may be equal to the pitch D 2  between the second emitter  202  adjacent in the second region R 2 . And, the pitch D 5  between the first and second emitters  201  and  202  adjacent in the second region R 2  in the first direction H or/and the second direction V may be ½ of the pitch D 2  of the second emitter  202 . The pitch D 5  between the first and second emitters  201  and  202  adjacent in the second region R 2  in the first and second directions H and V may be 1.2 of the pitch D 1  of the first emitters  201  adjacent to each other in the first region R 1 . The second emitters  202  may be disposed at a uniform pitch D 2  in each region between the first emitters  201  having a uniform pitch D 1  in the second region R 2 . A pitch D 3  between the first and second emitters  201  and  202  in a third direction (i.e., an oblique direction) in the second region R 2  may be the same as the pitch D 8  the adjacent first emitters  201  in the first region R 1 . A pitch between the first emitters  201  and a pitch D 8  between the second emitters  202  in the third direction in the second region R 2  may be the same. The pitch D 5 , which is an interval between the first and second emitters  201  and  202 , may be, for example, 40 μm or more or a range of 40 to 60 μm in consideration of the light emitting layer. 
     The separation distance D 7  between the emitters  201  and  202  adjacent in the first and second directions within the second region R 2 , that is, the minimum distance may be the same from each other. The distance D 7  between the emitters  201  and  202  adjacent in the first and second directions H and V in the second region R 2  may be smaller than the distance between the first emitters  201  in the third direction (that is, D 4 ) or the separation distance D 9  between the second emitters  202  D 9 . The separation distance D 7  may be ½ of the separation distance D 6 . 
     The area of the second region R 2  may be 30% or less, for example, 4% to 25% within the area of the first region R 1 . Here, the second region R 2  may have the same length in the first direction from the center position of the first and second regions R 1  and R 2  and may have the same length in the second direction. The second region R 2  may be disposed in a circular or polygonal shape at the center of the first region R 1 . 
     As a first example, when the second region R 2  has an area of 25%±2% of the total area, the angle of view by the light irradiated by the second light emitting portion E 2  may be provided in the range of 40 degrees to 50 degrees. As a second example, when the second region R 2  has an area of 11%±1.5% of the total area, the angle of view by the light irradiated by the second light emitting portion E 2  may be provided in the range of 25 degrees to 35 degrees. As a third example, when the second region R 2  has an area of 6%±1% of the total area, the angle of view by the light irradiated by the second light emitting portion E 2  may be provided in the range of 20 degrees to 25 degrees. As a fourth example, when the second region R 2  has an area of 4%±1% of the total area, the angle of view by the light irradiated by the second light emitting portion E 2  may be provided in the range of 15 degrees to 23 degrees. Here, the total area may be the area of the first region R 1 . 
     Here, in the first example, the total number of the second emitters  202  of the second light emitting portion E 2  may be 25% or less of the total number of the first emitters  201 , for example, in the range of 20% to 25%. In the second example, the total number of the second emitters  202  of the second light emitting portion E 2  may be 15% or less of the total number of the first emitters  201 , for example, in the range of 9% to 15%. In the third example, the total number of the second emitters  202  of the second light emitting portion E 2  may be 8% or less, for example, in the range of 4% to 8% of the total number of the first emitters  201 . In the fourth example, the total number of the second emitters  202  of the second light emitting portion E 2  may be 6% or less, for example, in the range of 2% to 6% of the total number of the first emitters  201 . Here, the total number of the first emitters  201  may be 450 or more, for example, in the range of 450 to 1000, and the number of the second emitters  202  may be at least 20 or more. According to the first to fourth examples, the number of second emitters  202  may be calculated and disposed. Here, the total number of first emitters  201  is the number of first emitters  201  disposed in the first region R 1 . 
     The second region R 2  may be provided according to a zoom magnification and an angle of view according to any one of the first to fourth examples. According to the first example, the light from the second light emitting portion E 2  may be provided in a zoom mode of 2 times compared to the reference multiple 1×, and according to the second example, the light from the second light emitting portion E 2  may be provided in a zoom mode of 3 times the compared to the reference multiple, and according to the third example, the light of the second light emitting portion E 2  may be provided in a zoom mode of 4 times the reference multiple, or according to the fourth example, the light from the second light emitting portion E 2  may be provided in a zoom mode of 5 times compared to the reference multiple. Here, when only the second light emitting portion E 2  is driven according to the first example, power consumption of 5.8%±1.2% may be saved compared to the power consumption of the first light emitting portion E 1 . When only the second light emitting portion E 2  is driven according to the second example, power consumption of 2.9%±0.5% may be saved compared to the power consumption of the first light emitting portion E 1 . When only the second light emitting portion E 2  is driven according to the third example, power consumption of 1.7%±0.3% may be saved compared to the power consumption of the first light emitting portion E 1 . Alternatively, when only the second light emitting portion E 1  is driven according to the first example, power consumption of 1%±0.2% may be saved compared to the power consumption of the first light emitting portion E 1 . 
     By selectively driving the first and second light emitting portions E 1  and E 2  to the first region R 1  and/or the second region R 2 , it is possible to provide light according to different angles of view and different zoom magnifications. In addition, power consumption may be reduced by up to 6% compared to the case in which the second region R 2  is not provided. As another example, a sub-region (not shown) having a third emitter (not shown) may be disposed in the second region R 2 , and sub-region (not shown) having a fourth emitter (not shown) may be disposed in the third region, for example, an n+1 region having n+1 emitters disposed within an n (n is 3 or more) region having n emitters may be disposed. 
     The first and second emitters  201  and  202  may include, for example, a vertical-cavity surface-emitting laser (VCSEL). Each of the first and second emitters  201  and  202  may be defined as an emitter having an opening. The first and second emitters  201  and  202  may emit light in a range of 750 nm or more, for example, in a range of 750 nm to 1100 nm or in a range of 750 nm to 950 nm. The first and second emitters  201  and  202  may emit the same peak wavelength. 
     As shown in  FIG.  5 (A) , the first emitters  201  may emit light when power is supplied to the first pad  101 . The first pad  101  may be electrically connected to the first electrode  280  extending through the upper portion of the first light emitting portion E 1 . As shown in  FIG.  5 (B) , the second emitters  202  may emit light when power is supplied to the second pad  102 . The second emitters  202  may be electrically connected to a second electrode  290  extending through upper portions of the first light emitting portion E 1  and the second light emitting portion E 2 . The first pad  101  may be a region to which an external power terminal, for example, a wire or a bonding member, is connected among the external regions of the first electrode  280 . The second pad  102  may be a region to which an external power terminal, for example, a wire or a bonding member, is connected among the external regions of the second electrode  290 . The second pad  102  may be disposed in a region closest to the second region R 2  among areas in which the first pad  101  is disposed, and may be disposed between regions of the first pad  101 . The second pad  102  may be disposed on an outer portion of the first region R 1  with an area smaller than that of the first pad  101 . 
     As shown in  FIGS.  4  and  6   , the second electrode  290  of the second pad  102  and the second emitter  202  may be connected to a bridge electrode  295 . One or a plurality of bridge electrodes  295  may be disposed. The bridge electrode  295  may be disposed along a third region R 3  between the second pad  102  and the second region R 2 , and may extend along the outer upper portions of the first emitters  201 . The width of the bridge electrode  295  may be equal to or smaller than the width of the second pad  102 . The width of the bridge electrode  295  may be equal to or smaller than the width of the second light emitting portion E 2 . 
     Here, when the bridge electrode  295  extends on the third region R 3  and is formed without the first emitter  201 , a loss in luminous intensity may occur due to a decrease in the number of the first emitters  201  due to the area covered by the bridge electrode  295 , and a desired field of illumination (FOI) may not be obtained. In addition, when extending through the first connection portion  284  of the first electrode  280  between the first emitters  201 , the width of the bridge electrode  295  of the second electrode  280  may be narrow, and accordingly, the resistance of the bridge electrode  295  may increase and the operating voltage increase. According to an embodiment of the invention, the light loss may be reduced by arranging the bridge electrode  295  of the second electrode  290  to overlap the first connection portion  284  of the first electrode  280  in the vertical direction Y. In addition, the region in which the second pad  102  is formed is formed separately from the first pad  101 , so that it may be formed as a single layer. Accordingly, by partially stacking the first and second electrodes  280  and  290  in multi-layers in the second region R 2  and the third region R 3 , a metal (e.g., Au) material may be saved, and since the width of the bridge electrode of the second electrode  290  is formed as wide as possible, the operating voltage may be reduced and current diffusion may be improved. 
     The second region R 2  may be an area of the first region R 1 , that is, an area of 30% or less of the total area, for example, in a range of 4% to 30% or in a range of 4% to 25%. This second region R 2  includes the second emitter  202  within the above range and selectively drives the second emitter  202 , thereby reducing the power consumption of the surface-emitting laser device  200 . In addition, power consumption by the second region R 2  having second emitters  202  for a zoom function higher than that of the first emitter  201  or the angle of view smaller than the reference angle of view (FOV) may be reduced by up to 6%. That is, when the zoom function of more than 1× is used, power consumption may be reduced by driving only the second emitter  202  of the second region R 2  and turning off the first emitter  201 . Also, in the case of the reference angle of view or the 1× zoom mode, the first emitter  201  may be turned on and the second emitter  202  may be turned off. 
     In addition, when driving the second region R 2  other than the entire region in the surface-emitting laser device, since the first emitter  201  and the second emitter  202  are used to independently drive, while the difference in current applied to each second emitter  202  to obtain the same current density is removed, the current supplied to the second region R 2  may be reduced, and total power consumption may also be reduced. Here, since the stacked structure of the first and second emitters  201  and  202  is provided in the same structure, the first emitter  201  will be mainly described, and for the second emitter  202 , the first emitter  201  will be referred to. In addition, a configuration different from the first emitter  201  and an additional configuration in the stacked structure of the second emitter  202  will be described later. 
     Referring to  FIGS.  4 ,  7  and  8   , the first emitter  201  may include a lower electrode  215 , a substrate  210 , a first reflective layer  220 , a light emitting layer  230 , an oxide layer  240 , a second reflective layer  250 , a passivation layer  270 , and a first electrode  280 . The first electrode  280  may include a first contact portion  282  and a first connection portion  284 . The second electrode  290  may include a second contact portion  292  and a second connection portion  294 , and the description of the first electrode  280  will be referred to. 
     The first emitter  201  may include a substrate  210 . The substrate  210  is disposed between the first reflective layer  220  and the lower electrode  215  and may be a conductive substrate or a non-conductive substrate. As the conductive substrate, a metal having excellent electrical conductivity may be used. Since the substrate  210  must be able to sufficiently dissipate heat generated during the operation of the first emitter  201 , a GaAs substrate or a metal substrate having high thermal conductivity may be used, or a silicon (Si) substrate may be used. As the non-conductive substrate, an AlN substrate, a sapphire (Al 2 O 3 ) substrate, or a ceramic-based substrate may be used. 
     The lower electrode  215  may be disposed under the substrate  210 . The lower electrode  215  may be formed of a conductive material in a single layer or in multiple layers. For example, the lower electrode  215  may be a metal, and has a single-layer or multi-layer structure including at least one of aluminum (Al), titanium (Ti), chromium (Cr), nickel (Ni), copper (Cu), and gold (Au) and may increase the light output by improving the electrical characteristics. The lower electrode  215  may be a common electrode or a cathode terminal commonly connected to the first emitter  201  and the second emitter  202 . 
     The first reflective layer  220  may be disposed on the substrate  210 . When the substrate  210  is omitted to reduce the thickness, the lower surface of the first reflective layer  220  may be in contact with the upper surface of the lower electrode  215 . The first reflective layer  220  may be doped with a first conductivity-type dopant. For example, the first conductivity-type dopant may include an n-type dopant such as Si, Ge, Sn, Se, Te, or the like. The first reflective layer  220  may include a gallium-based compound, for example, AlGaAs, but is not limited thereto. The first reflective layer  220  may be a distributed Bragg reflector (DBR). For example, the first reflective layer  220  may have a structure in which first and second layers including materials having different refractive indices are alternately stacked at least once or more. The thickness of the layer in the first reflective layer  220  may be determined according to each refractive index and the wavelength of light emitted from the light emitting layer  230 . 
     The light emitting layer  230  may be disposed on the first reflective layer  220 . Specifically, the light emitting layer  230  may be disposed between the first reflective layer  220  and the second reflective layer  250 . The light emitting layer  230  may be disposed between a partial region of the first reflective layer  220  and the second reflective layer  250 . The light emitting layer  230  may include an active layer and at least one cavity therein, and the active layer may include any one of a single well structure, a multi well structure, a single quantum well structure, a multi quantum well (MQW) structure, a quantum dot structure, and a quantum wire structure. The active layer may have a pair of InGaAs/AlxGaAs, AlGaInP/GaInP, AlGaAs/AlGaAs, AlGaAs/GaAs, GaAs/InGaAs, etc. using a Group III-V or a Group II-VI compound semiconductor material and be formed in a 1 to 3 pair structure, but is not limited thereto. The cavity may be formed of an Al y Ga (1-y) As (0&lt;y&lt;1)  material, and may include a plurality of layers of Al y Ga (1-y) As, but is not limited thereto. 
     The oxide layer  240  may include an insulating region  242  and an opening  241 . The insulating region  242  may surround the opening  241 . For example, the opening  241  may be disposed on a light emitting region (center region) of the light emitting layer  230 , and the insulating region  242  may be disposed on a non-emitting region (edge region) of the light emitting layer  230 . The non-emitting region may surround the light-emitting region. The opening  241  may be a passage region through which current flows. The insulating region  242  may be a blocking region that blocks the flow of current. The insulating region  242  may be referred to as an oxide layer or an oxide layer. The oxide layer  240  restricts the flow or density of current so that a more concentrated laser beam is emitted, and thus may be referred to as a current confinement layer. 
     The amount of current supplied from the first electrode  280  to the light emitting layer  230 , i.e., a current density, may be determined by the size of the opening  241 . The size of the opening  241  may be determined by the insulating region  242 . As the size of the insulating region  242  increases, the size of the opening  241  decreases, and when the size of the opening  241  decreases, the current density supplied to the light emitting layer  230  may increase. In addition, the opening  241  may be a passage through which the beam generated by the light emitting layer  230  travels in the upper direction, that is, in the direction of the second reflective layer  250 . That is, the divergence angle of the beam of the light emitting layer  230  may vary according to the size of the opening  241 . 
     The insulating region  242  may be formed of an insulating layer, for example, aluminum oxide (Al 2 O 3 ). For example, when the oxide layer  240  includes aluminum gallium arsenide (AlGaAs), in the AlGaAs of the oxide layer  240 , the edge region that reacts with H 2 O is changed to aluminum oxide (Al 2 O 3 ) to form an insulating region  242 , and the central region that does not react with H 2 O becomes an opening  241  containing AlGaAs. 
     Light emitted from the light emitting layer  230  through the opening  241  may be emitted to the upper region, and the light transmittance of the opening  241  may be higher than that of the insulating region  242 . The insulating region  242  may include a plurality of layers, for example, at least one layer may include a Group III-V or a Group II-VI compound semiconductor material. The second reflective layer  250  may be disposed on the oxide layer  240 . The second reflective layer  250  may include a gallium-based compound, for example, AlGaAs. The second reflective layer  250  may be doped with a second conductivity-type dopant. The second conductivity-type dopant may be a p-type dopant such as Mg, Zn, Ca, Sr, or Ba. As another example, the first reflective layer  220  may be doped with a p-type dopant, and the second reflective layer  250  may be doped with an n-type dopant. The second reflective layer  250  may be a distributed Bragg reflector (DBR). For example, the second reflective layer  250  may have a structure in which a plurality of layers including materials having different refractive indices are alternately stacked at least once or more. Each layer of the second reflective layer  250  may include AlGaAs, and specifically, may be made of a semiconductor material having a composition formula of Al x Ga (1-x) As (0&lt;x&lt;1)  having a different composition of x. have. Here, when Al increases, the refractive index of each layer may decrease, and when Ga increases, the refractive index of each layer may increase. The thickness of each layer of the second reflective layer  250  may be λ/4n, λ may be the wavelength of light emitted from the active layer, and n may be the refractive index of each layer at the wavelength of light. The second reflective layer  250  may be formed by alternately stacking layers, and the number of pairs of layers in the first reflective layer  220  may be greater than the number of pairs of layers in the second reflective layer  250 . Here, the reflectance of the first reflective layer  220  may be greater than that of the second reflective layer  250 . Here, the layers from the first reflective layer  220  to the second reflective layer  250  may be defined as light emitting structures. The upper portion of the light emitting structure may be provided as an inclined side surface. An upper portion of the light emitting structure may be exposed to an inclined side surface by a mesa etching process. 
     The passivation layer  270  may be disposed around the upper portion of the light emitting structure. The upper portion of the light emitting structure may include, for example, a light emitting layer  230 , an oxide layer  240 , and a second reflective layer  250 . The passivation layer  270  may be disposed on the upper surface of the first reflective layer  220 . The passivation layer  270  may be disposed on an edge region of the second reflective layer  250 . When the light emitting structure is partially etched, a portion of the upper surface of the first reflective layer  220  may be exposed, and a portion of the light emitting structure may be disposed in a protruding form. The passivation layer  270  may be disposed on the periphery of a partial region of the light emitting structure and on the exposed upper surface of the first reflective layer  220 . 
     The passivation layer  270  may protect the light emitting structure from the outside and may block an electrical short between the first reflective layer  220  and the second reflective layer  250 . The passivation layer  270  may be formed of an insulating material or a dielectric material, for example, may be formed of an inorganic material such as SiO 2 , but is not limited thereto. 
     The first electrode  280  may include a first contact portion  282  and a first connection portion  284  connected to the first contact portion  282 . The first contact portion  282  may be in contact with a portion of the upper surface of the second reflective layer  250 . The first contact portion  282  may be in ohmic contact with the second reflective layer  250 . The first connection portion  284  may connect the first contact portion  282  and the first pad (see  101  of  FIG.  4   ), and may connect the adjacent first emitters  201 . The first contact portion  282  and the first connection portion  284  may be formed of a conductive material. For example, the first contact portion  282  and the first connection portion  284  may be formed in a single-layer or multi-layer structure including at least one aluminum (Al), titanium (Ti), chromium (Cr), nickel (Ni), copper (Cu), or gold (Au). The first contact portion  282  and the first connection portion  284  may be formed of the same metal or non-metal material, or may be formed of different materials. The second contact portion  292  and the second connection portion  294  may be selected from materials of the first contact portion  282  and the first connection portion  284 . The first contact portion  282  may be in contact with the second reflective layer  250  on the outer periphery of the passivation layer  270  overlapping the opening  241  in the vertical direction Y. The first contact portion  282  may be in contact with the second reflective layer  250  through the passivation layer  270 , and may be disposed around the upper periphery of the second reflective layer  250  in a loop shape or a closed loop shape. 
     As shown in  FIG.  4   , in each of the first and second emitters  201  and  202 , when viewed from a top view, the opening  241  is disposed at the center, and the insulating region  242  and the first and second contact portions  282  and  292  may be disposed around the insulating region  242 . 
     As shown in  FIG.  10   , the first insulating layer  285  may be disposed on the third region R 3  between the second region R 2  and the second pad  102 . The first insulating layer  285  may be disposed between the first electrode  280  of the first light emitting portion E 1  and the bridge electrode  295  of the second electrode  290  of the second light emitting portion E 2 . The first insulating layer  285  may be disposed on an upper portion of the first electrode  280  of the first emitter  201  and a lower portion of the bridge electrode  295  of the second electrode  290  of the second emitter  202 , and may electrically and physically separate the first connection portion  284  of the first electrode  280  from the bridge electrode  295 . Accordingly, the bridge electrode  295  of the second electrode  290  on the third region R 3  may be electrically insulated from the first electrode  280  by the first insulating layer  285 . The second insulating layer  287  may extend on an outer upper portion of the bridge electrode  295 . The first insulating layer  285  is disposed between the second connection portion  294  of the second electrode  290  and the first connection portion  284  of the first electrode  280  in the second region R 2 , and may insulate between the first and second connection portions  284  and  294 . The first connection portion  284 , the first insulating layer  285 , and the second connection portion  294  may be disposed to overlap in the vertical direction Y in a portion of the second region R 2 . That is, after the first contact portion  292  of the first electrode  280  and the second electrode  290  is formed, the passivation layer may be formed or may be formed by a reverse process, after which the first insulating layer  285  is formed, thereafter, the process of forming the second connection portion  294  of the second electrode  290  may be performed. Accordingly, the first insulating layer  285  may separate the first electrode  280  and the second electrode  290  on the first connection portion  284  of the first electrode  280 . The vertical direction Y is a direction orthogonal to the first and second directions H and V of  FIG.  4   , and the direction X orthogonal to the vertical direction Y is the first direction H or the second direction V of  FIG.  4   , or may be in a diagonal direction. Here, as shown in  FIGS.  4  and  10   , the second connection portion  294  of the second electrode  290  the bridge electrode  295  connected to the second connection portion  294  may extend on the flat portions F 1  and F 2  outside the light emitting structure. The flat portions F 1  and F 2  are flat portions of upper portions of the first and second emitters  201  and  202 , and may be mesa-etched regions around the protruding portions P 1  and P 2  of the light emitting structure. With respect to the adjacent protruding portions P 1  and P 2 , the minimum width of the first flat portion F 1  of the second region R 2  may be a separation distance D 7  between the adjacent protruding portions P 1  and P 2  of the first and second emitters  201  and  202 . In the region between the adjacent protruding portions P 1  and P 2 , the maximum width of the first flat portion F 1  of the second region R 2  may be the distance between the first protruding portions P 1  of the first emitter  201  or may be the separation distance D 9  between the second protruding portions P 2  of the second emitter  202 . Here, the separation distance D 7 , which is the minimum width, may be formed in a range of at least 7 μm or more, for example, in the range of 7 μm to 12 μm, and the separation distance D 9 , which is the maximum width, may be formed of in 10 μm or more, for example, in the range of 10 μm to 20 μm. Accordingly, the second connection portion  294  of the second electrode  290  may have the above-described separation distances D 7  and D 9  depending on the region, and may connect the adjacent second emitters  202  to each other, and may give a current spreading effect without increasing the connection resistance. Also, the bridge electrode  295  of the second electrode  290  has a minimum width (i.e., D 7 ) along the region between the first protruding portions P 1  of the first emitter  202 , and may extended to both sides of each of the first protruding portion P 1 . Accordingly, the connection resistance by the bridge electrode  295  is not increased, the current is spread, and the operating voltage may be decreased. 
     As shown in  FIGS.  4  and  9   , the second insulating layer  287  may be further disposed in a boundary region between the first light emitting portion E 1  and the second light emitting portion E 2 . The second insulating layer  287  may insulate between the first connection portion  284  of the first electrode  280  of the first light emitting portion E 1  and the second connection portions  294  of the second electrode  290  of the second light emitting portion E 2 . Accordingly, the second insulating layer  287  may electrically and physically separate the second connection portion  294  of the second electrode  290  of the second light emitting portion E 2  from the first electrode  280  of the first light emitting portion E 1  to on the outside of the second region R 2 . The second insulating layer  287  may extend in a straight line in one direction along the boundary region or in a zigzag shape. That is, the second insulating layer  287  is disposed in a region that does not spatially affect the adjacent emitters  201  and  202  or may extend between the first connection portion  284  of the first electrode  280  and the second connection portion  294  of the second electrode  290  or the bridge electrode  295  so that the opening  241  is not affected. The first insulating layer  285  and the second insulating layer  287  may be made of an insulating material, for example, may include at least one of nitride or oxide, for example, polyimide, silica (SiO 2 ), or silicon nitride (Si 3 N 4 ). 
     Referring to  FIGS.  11  to  13   , in the surface-emitting laser device, the first region R 1  may include the third region R 3  and may be a region excluding the second region R 2 . In the full driving mode or the reference angle of view, all of the light emitting portions E 1  and E 2  of the first region R 1  and the second region R 2  may emit light. The second region R 2  may be any one of a plurality of sub-regions Ra, Rb, Rc, and Rd according to an angle of view smaller than a reference or a zoom magnification. The region corresponding to the angle of view and the zoom magnification smaller than the reference may be each of the sub-regions Ra, Rb, Rc, and Rd set in the first, second, third, and fourth examples described above. As shown in  FIGS.  11  and  12   , the second region R 2  may implement any one of the plurality of sub-regions Ra, Rb, Rc, and Rd. Here, the second emitter disposed on the second light emitting portion E 2  may include M rows and N columns, the M rows may include at least 8 rows, and the N columns may include at least 4 columns. For example, according to Examples 1 to 4, M rows may be 8 to 20 rows, and N (N&lt;M) columns may be 4 to 15 columns smaller than 18 columns. The second emitters may be arranged in the same column for each adjacent row or arranged in a zigzag manner. The first emitter may include rows O and columns P, and rows O (O&gt;M, O&gt;N) may have at least 30 rows, and columns P (P&gt;M, P&gt;N) may have at least 15 columns, may be arranged in a matrix manner, or may be arranged in a zigzag form. Here, when only the second emitters in the second region R 2  are arranged, the first emitters may be arranged at the same pitch according to rows and columns. And, the number of rows and columns may have a relationship of O&gt;P&gt;M&gt;N. 
     The area of the sub-region Ra may be 30% or less, for example, in the range of 4% to 25% within the area of the first region R 1 . The sub-region Ra may be the size of the second region R 2  in  FIG.  2   . Here, the sub-regions Ra may have the same length in the first direction from the central positions of the first and second regions R 1  and R 2  and may have the same length in the second direction. As a first example, when the sub-region Ra has an area of 25%±2% of the total area, the angle of view by the light irradiated by the second light emitting portion E 2  may be provided in the range of 40 degrees to 50 degrees (see  FIG.  12 (A) ). As a second example, when the sub-region Rb has an area of 11%±1.5% of the total area, the angle of view by the light irradiated by the second light emitting portion E 2  may be provided in the range of 25 degrees to 35 degrees (see  FIG.  12 (B) ). As a third example, when the sub-region Rc has an area of 6%±1% of the total area, the angle of view by the light irradiated by the second light emitting portion E 2  may be provided in the range of 20 degrees to 25 degrees (see  FIG.  12 (C) ). As a fourth example, when the sub-region Rc has an area of 4%±1% of the total area, the angle of view by the light irradiated by the second light emitting portion E 2  may be provided in the range of 15 degrees to 23 degrees (see  FIG.  12 (D) ). Here, the total area may be the area of the first region R 1 . 
     In the first example, the total number of the second emitters  202  of the second light emitting portion E 2  may be 25% or less of the total number of the first emitters  201 , for example, in the range of 20% to 25%. In the second example, the total number of the second emitters  202  of the second light emitting portion E 2  may be 15% or less of the total number of the first emitters  201 , for example, in the range of 9% to 15%. In the third example, the total number of the second emitters  202  of the second light emitting portion E 2  may be 8% or less, for example, in the range of 4% to 8% of the total number of the first emitters  201 . Here, the total number of the first emitters  201  may be 450 or more, for example, in the range of 450 to 1000, and the number of the second emitters  202  may be at least 20 or more. According to the first to fourth examples, the number of second emitters  202  may be calculated and disposed. In the fourth example, the total number of the second emitters  202  of the second light emitting portion E 2  may be 6% or less, for example, in the range of 2% to 6% of the total number of the first emitters  201 . The sub-regions Ra, Rb, Rc, and Rd of the second region R 2  may be provided according to a zoom magnification and an angle of view according to any one of the first to fourth examples. According to the first example, the light from the second light emitting portion E 2  may be provided in a zoom mode of 2 times compared to the reference multiple 1×, and according to the second example, the light from the second light emitting portion E 2  may be provided in zoom mode of 3 times compared to the reference multiple, and according to the third example, the light of the second light emitting portion E 2  may be provided in a zoom mode of 4 times the reference multiple, or according to the fourth example, the light from the second light emitting portion E 2  may be provided in a zoom mode of 5 times compared to the reference multiple. 
     Here, when only the second light emitting portion E 2  is driven according to the first example, power consumption of 5.8%±1.2% is saved compared to the power consumption of the first light emitting portion E 1 , and when only the second light-emitting unit E 2  is driven according to the second example, power consumption of 2.9%±0.5% is saved compared to the power consumption of the first light emitting portion E 1 , and when only the second light emitting portion E 2  is driven according to the third example, power consumption of 1.7%±0.3% is saved compared to the power consumption of the first light emitting portion E 1 , or when only the second light emitting portion E 2  is driven according to the first example, the power consumption of 1%±0.2% may be saved compared to the power consumption of the first light emitting portion E 1 . As described above, by driving the light emitting portions E 1  and E 2  to the first region R 1  and/or the second region R 2 , light according to different angles of view and different zoom magnifications may be provided. In addition, power consumption may be reduced by up to 6% compared to the case in which the second region R 2  is not provided. 
     As shown in  FIG.  14   , the distance measurement device may include a light source  30 , a light receiving portion  20 , a plurality of amplifiers  70 , a peak detector  72 , a selector  74 , and a processor  76 . As shown in  FIGS.  2  to  10    disclosed above, the light source  30  may radiate light toward the object  1  through the first and second light emitting portions  51  and  52  having the sub-regions Ra, Rb, Rc and Rd of the first region R 1  and/or the second region R 2 . The light source  30  may include a driver  60  having a first driver  61  for driving the first light emitting portion  51  and a second driver  62  for driving the second light emitting portion  52 . The first and second drivers  61  and  62  may be implemented as driver ICs. A description of overlapping contents of the light source  30  will be omitted. 
     The light receiving portion  20  may detect light reflected or scattered from the object  1  and output an electrical signal. The light receiving portion  20  may detect the scattered light and output an electrical signal. The light receiving portion  20  may convert reflected or scattered light into a voltage signal. The plurality of amplifiers  70  may generate a plurality of amplified electrical signals by amplifying the electrical signal with different gains, respectively. The plurality of amplifiers  70  may have different gain values from a low gain value to a high gain value. The plurality of peak detectors  72  may detect a peak for each of the amplified signals to generate a peak detection signal, and each of the peak detectors  72  may detect the center position of the amplified electrical signal, thereby detecting the peak. The selector  74  may select an optimal peak detection signal based on the level of at least one amplified electric signal among the plurality of amplified electric signals. The processor  76  may control the operation of each component of the distance measurement device. The distance measurement device may include a memory in which programs and other data for operations performed by the processor  76  are stored. The processor  76  may include a time to digital converter (TDC) for measuring the time between the irradiation time of the light irradiated from the first and/or second light emitting portions  50  (i.e.,  51  and  52 ) of the light source  30  and the detection time of the peak detected by the peak detector  74 , and the processor  76  may measure the distance to the object  1  based on the time measured by the TDC. According to another embodiment, the processor  76  may include an analog digital converter (ADC) that converts a peak that is an analog signal into a digital signal, and the processor  76  may measure the distance to the object  1  by processing the digital signal converted by the ADC. 
     As shown in  FIG.  15   , the surface-emitting laser device may select any one or both of the first and second light emitting portions (S 21 ), and the selected light emitting portion is driven by the first and second driving portions (S 22 ), and the infrared light may be irradiated towards the object. Thereafter, the light receiving portion receives the light irradiated by the first and/or second light emitting portion (S 24 ), and analyzes the received light to detect a 3D image or distance. In this case, when the second light emitting portion is driven, light for a magnification higher than the reference magnification, that is, 2 magnification or more and smaller than the reference angle of view, for example, light for an angle of view of less than 80 degrees may be irradiated. Accordingly, the 3D image or distance corresponding to the object may be measured by the light received by the light receiving portion. Accordingly, power consumption at the zoom magnification may be reduced compared to the case of the reference mode (reference angle of view, reference magnification). 
       FIG.  16    is a perspective view illustrating an example of a mobile terminal to which a surface-emitting laser device according to an embodiment of the invention is applied. 
     As shown in  FIG.  16   , the mobile terminal  1500  may include a camera module  1520 , a flash module  1530 , and an autofocus device  1510  provided on one or the rear side. Here, the autofocus device  1510  may include the above-described surface-emitting laser device and a light receiving portion as a light emitting layer. The flash module  1530  may include an emitter emitting light therein. The flash module  1530  may be operated by a camera operation of a mobile terminal or a user&#39;s control. The camera module  1520  may include an image capturing function and an auto focus function. For example, the camera module  1520  may include an auto-focus function using an image. The autofocus device  1510  may include an autofocus function using a laser. The autofocus device  1510  may be mainly used in a condition in which the auto focus function using the image of the camera module  1520  is deteriorated, for example, in proximity of 10 m or less or in a dark environment. The above detailed description should not be construed as restrictive in all respects and should be considered as illustrative. The scope of the embodiments should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the embodiments are included in the scope of the embodiments.