HEAD MOUNTED DEVICE AND OPERATING METHOD FOR HEAD MOUNTED DEVICE

A head mounted device and an operating method for the head mounted device are provided. The head mounted device includes a display unit, a first sensing device and a second sensing device. The display unit displays an image. The first sensing device detects whether there is an object causing harm to the user within a specific range. The second sensing device captures an object image of the object, so that the display unit displays the object image.

BACKGROUND

Technical Field

The disclosure relates to an electronic device and an operating method for the electronic device, and in particular relates to a head mounted device and an operating method for the head mounted device.

Description of Related Art

Users may enjoy audio-visual entertainment or play games through head mounted devices. The head mounted device is, for example, a head mounted display. When a user enjoys audio-visual entertainment or plays games through a head mounted device, the user cannot know about the conditions of the environment around the user. It may be seen from this that the user who is using the head mounted device has no way of knowing that the user himself may be exposed to danger. Therefore, how to provide a head mounted device that may detect whether there is an object causing harm to the user is one of the research focuses of those skilled in the art.

SUMMARY

A head mounted device and an operating method for the head mounted device, which may detect whether there is an object causing harm to a user, are provided in the disclosure.

According to an embodiment of the disclosure, a head mounted device is worn on a user and provides an image to the user. The head mounted device includes a display unit, a first sensing device, and a second sensing device. The display unit displays the image. The first sensing device detects whether there is an object causing harm to the user within a specific range. The second sensing device captures an object image of the object, so that the display unit displays the object image.

According to embodiments of the disclosure, an operating method is configured for a head mounted device. The head mounted device is worn on a user and provides an image to the user. The head mounted device includes a display unit, a first sensing device, and a second sensing device. The operating method includes the following operation. Whether there is an object causing harm to the user within a specific range is detected by the first sensing device. An object image of the object is captured by the second sensing device when the object causing harm to the user is detected within the specific range. The display unit is controlled to display the object image.

Based on the above, in this disclosure, whether there is an object causing harm to the user within a specific range is detected by the first sensing device. When an object causing harm to the user within the specific range is detected, the display unit displays the object image of the object. In this way, the head mounted device may know about that there is an object causing harm to the user within a specific range, and display the object image of the object through the display unit. The usage safety of the head mounted device may be improved.

DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS

The disclosure may be understood by referring to the following detailed description in conjunction with the accompanying drawings as described below. It should be noted that, for purposes of clarity and easy understanding by readers, each drawing of the disclosure depicts a part of an electronic device, and some components in each drawing may not be drawn to scale. In addition, the number and size of each device depicted in the drawings are illustrative only and not intended to limit the scope of the disclosure.

Certain terms are used throughout the description and claims below to refer to specific components. It should be understood by those skilled in the art, manufacturers of electronic equipment may refer to components by different names. The disclosure does not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms “comprising”, “including”, and “having” are used in an open-ended manner, and should therefore be construed to mean “including but not limited to . . . ”, therefore, when the terms “comprising”, “including”, and/or “having” are used in the description, it indicates the existence of corresponding features, regions, steps, operations, and/or components, but are not limited to the existence of one or more corresponding features, regions, steps, operation, and/or components.

It should be understood that when a component is referred to as being “coupled to”, “connected to”, or “conducted to” another component, the component may be directly connected to another component and an electrical connection may be established directly, or there may be an intermediate component between these components for a relay electrical connection (indirect electrical connection). In contrast, when a component is referred to as being “directly coupled to,” “directly connected to”, or “directly connected to” another component, there are no intermediate components present.

Although terms such as first, second, third, etc. may be used to describe various constituent components, such constituent components are not limited by these terms. The terms are only used to distinguish a constituent component from other constituent components in the specification. Claims may not use the same terms, but may use the terms first, second, third, etc. with respect to the required order of the components. Therefore, in the following description, the first constituent component may be the second constituent component in the claims.

The electronic device of the disclosure may include a display unit, an antenna device, a sensing device, a light-emitting device, a touch display device, a curved display device, or a free shape display, but not limited thereto. The electronic device may include a bendable or flexible electronic device. The electronic device may, for example, comprise liquid crystal, light-emitting diode, quantum dot (QD), fluorescence, phosphor, other suitable display materials, or a combination of the materials thereof, but not limited thereto. The light emitting diode may include, for example, an organic light-emitting diode (OLED), a mini light emitting diode (mini LED), a micro light emitting diode (micro LED), or a quantum dot light emitting diode (quantum dot LED, which may include QLED, QDLED), or other suitable materials, or a combination thereof, but not limited thereto. The display device may include, for example, but not limited to, a spliced display device. The antenna device may be, for example, a liquid crystal antenna, but not limited thereto. The antenna device may, for example, include an antenna splicing device, but not limited thereto. It should be noted that, the electronic device may be any arrangement and combination of the foregoing, but not limited thereto. In addition, the shape of the electronic device may be rectangular, circular, polygonal, a shape with curved edges, or other suitable shapes. The electronic device may have peripheral systems such as a driving system, a control system, a light source system, etc. to support a display device, an antenna device, or a spliced device, but the disclosure is not limited thereto. The sensing device may include a camera, an infrared sensor, or a fingerprint sensor, etc., and the disclosure is not limited thereto. In some embodiments, the sensing device may further include a flash, an infrared (IR) light source, other sensors, electronic components, or a combination thereof, but not limited thereto.

In the disclosure, the embodiments use “pixel” or “pixel unit” as a unit for describing a specific region including at least one functional circuit for at least one specific function. The region of the ‘pixels’ depends on the unit configured to provide a specific function, adjacent pixels may share the same parts or wires, but may also contain specific parts within themselves. For example, adjacent pixels may share the same scan line or the same data line, but a pixel may also have its own transistors or capacitors.

It should be noted that technical features in different embodiments described below may be replaced, reorganized or mixed with each other to form another embodiment without departing from the spirit of the disclosure.

Referring toFIG.1andFIG.2at the same time,FIG.1is a usage scenario diagram of a head mounted device according to an embodiment of the disclosure.FIG.2is a schematic diagram of a head mounted device according to an embodiment of the disclosure. In this embodiment, a head mounted device (HMD)100is worn on the user U and provides an image IMG to the user U. The head mounted device100is, for example, any form of head mounted display device. In this embodiment, the head mounted device100includes a display unit110, a first sensing device120, and a second sensing device130. The display unit110displays the image IMG. The first sensing device120detects whether there is an object OBJ causing harm to the user U within a specific range PR. The second sensing device130captures an object image OIMG of the object OBJ, so that the display unit110displays the object image OIMG.

Referring toFIG.1,FIG.2, andFIG.3at the same time,FIG.3is a flowchart of an operating method according to an embodiment of the disclosure. In this embodiment, the operating method S100is configured for the head mounted device100. The operating method S100includes steps S110to S130. The user U enjoys audio-visual entertainment or plays games through the head mounted device100. The first sensing device120starts to detect the environment around the user U. During use, the first sensing device120detects in step S110whether there is an object OBJ that may cause harm to the user U within the specific range PR. When the first sensing device120detects that there is an object OBJ causing harm to the user U within the specific range PR, the second sensing device130captures the object image OIMG of the object OBJ in step S120. Next, the head mounted device100controls the display unit110to display the object image OIMG of the object OBJ in step S130. After step S130, the operating method S100returns to the operation of step S110.

It is worth mentioning here that during use, the head mounted device100may detect the object OBJ causing harm to the user within a specific range PR, and display the object image OIMG through the display unit110. In this way, the usage safety of the head mounted device100may be improved.

On the other hand, in step S110, when the first sensing device120does not detect the object OBJ causing harm to the user U within the specific range PR, the first sensing device120continues to detect in step S110whether there is an object OBJ that may cause harm to the user U within the specific range PR.

In this embodiment, the first sensing device120is an infrared detection device. The first sensing device120is, for example, a long-wave infrared (LWIR) detection device. The specific range PR may be the physical activity range centered on the user U (however, this disclosure is not limited thereto). Therefore, the physical activity range of the user U is set to the specific range PR. The specific range PR may move as the user U moves. In this embodiment, the area of the specific range PR may be determined according to the detection distance of the first sensing device120, alternatively, the user U may set the area range of the specific range PR in the head mounted device100.

In this embodiment, the head mounted device100may analyze the infrared image IRIMG based on the infrared data IRD corresponding to the infrared image IRIMG captured by the first sensing device120. For example, the head mounted device100also includes a processor140. The processor140is coupled to the display unit110, the first sensing device120, and the second sensing device130. The head mounted device100may utilize the processor140to determine whether there is an object OBJ in the infrared image IRIMG that may cause harm to the user U. The object OBJ may be a pet, a person, a heat source, or an obstacle, but the disclosure is not limited thereto. The obstacle may be, for example, a furniture or a wall. When it is determined that there is an object OBJ causing harm to the user U in the infrared image IRIMG, it means that there is an object OBJ causing harm to the user U within the specific range PR. Therefore, the processor140notifies the second sensing device130to capture the object image OIMG of the object OBJ, and controls the display unit110to display the object image OIMG of the object OBJ.

It should be noted that the head mounted device100preferentially utilizes the first sensing device120to detect the environment around the user U. Therefore, the infrared image IRIMG shows the outline of the object around the user U, rather than showing the real visual appearance of the object around the user U. Therefore, the environment around user U is not leaked. The privacy of user U is ensured. Color interference from ambient light may be reduced. In addition, when the environment is dark, the head mounted device100may also determine whether there is an object OBJ causing harm to the user within the specific range PR.

In this embodiment, the head mounted device100may perform wired communication or wireless communication with the external device ED. The external device ED may be an electronic device with computing capabilities, such as a server, a host, a desktop computer, a laptop, a tablet, or a smartphone. The external device ED receives the infrared image IRIMG. The external device ED determines whether there is an object OBJ in the infrared image IRIMG that may cause harm to the user U. When it is determined that there is an object OBJ causing harm to the user U in the infrared image IRIMG, the external device ED notifies the second sensing device130to capture the object image OIMG of the object OBJ, and controls the display unit110to display the object image OIMG of the object OBJ. In some embodiments, the external device ED includes circuitry similar to the functionality of the processor140.

The processor140is, for example, a central processing unit (CPU), or other programmable general-purpose or special-purpose microprocessor, a digital signal processor (DSP), a programmable controller, an application specific integrated circuit (ASIC), a programmable logic device (PLD), or other similar devices, or a combination of these devices, which may load and execute computer programs. The second sensing device130may be any form of visible light image capturing device (but the disclosure is not limited thereto). The second sensing device130may be implemented by, for example, a charge coupled device (CCD) or an under-display image capturing device (but the disclosure is not limited thereto).

In some embodiments, the processor140may be disposed inside the first sensing device of the head mounted device100, alternatively, the processor140may be disposed on other electronic devices. The head mounted device100may transmit data to the processor140for processing through data transmission. Therefore, the first sensing device120itself may determine whether there is an object OBJ in the infrared image IRIMG that may cause harm to the user U without the help of an external device. It notifies the second sensing device130to capture the object image OIMG of the object OBJ, and controls the display unit110to display the object image OIMG of the object OBJ.

Referring toFIG.2andFIG.4at the same time,FIG.4is a schematic diagram of a processor according to an embodiment of the disclosure. In this embodiment, the processor140includes an image circuit141, an analysis circuit142, and a notification circuit143. The image circuit141receives the infrared data IRD from the first sensing device120and renders the infrared data IRD into an infrared image IRIMG. The infrared image IRIMG may show the outline and temperature of the heat source around the user U.

The analysis circuit142is coupled to the image circuit141and the notification circuit143. The analysis circuit142receives the infrared image IRIMG, and analyzes the infrared image IRIMG to determine whether there is an object OBJ causing harm to the user U within the specific range PR. When there is an object OBJ causing harm to the user U within the specific range PR, the analysis circuit142controls the notification circuit143to provide the notification signal SN. Therefore, the second sensing device130captures the object image OIMG of the object OBJ in response to the notification signal SN. The display unit110displays the object image OIMG of the object OBJ.

Referring toFIG.1,FIG.2, andFIG.5at the same time,FIG.5is a flowchart of an operating method according to another embodiment of the disclosure. The operating method S200is configured for the head mounted device100. The operating method S200includes steps S210to S270. The first sensing device120detects the surrounding of the user U in step S210. For example, in step S210, the first sensing device120detects the surrounding of the user U to provide infrared data IRD corresponding to the infrared image IRIMG.

In step S220, the processor140determines whether there is an object OBJ that may cause harm to the user U within the specific range PR. For example, in step S220, the processor140may determine whether there is an object OBJ within the specific range PR by using the infrared data IRD. When the object OBJ is located outside the specific range PR, the operating method S200returns to the operation of step S210. Furthermore, when the object OBJ is located outside the specific range PR, the processor140stops providing the notification signal SN.

On the other hand, when the object OBJ is located within the specific range PR, the processor140further determines the movement of the object OBJ within the specific range PR in step S230.

In step S230, when the object OBJ within the specific range PR is moving away from the user U, the processor140determines that the object OBJ moving away from the user U will not cause harm to the user U. For example, the processor140determines that the outline of the infrared image IRIMG within the specific range PR becomes smaller rapidly. Therefore, the operating method S200returns to the operation of step S210. Furthermore, when the object OBJ within the specific range PR is moving away from the user U, the processor140stops providing the notification signal SN.

In step S230, when the object OBJ within the specific range PR is approaching the user U, the processor140determines that the object OBJ approaching the user U will cause harm to the user U. For example, the processor140determines that the outline of the infrared image IRIMG within the specific range PR becomes larger rapidly. Therefore, the processor140provides the notification signal SN in step S240. Therefore, the head mounted device100alerts the user U based on the notification signal SN. For example, the display unit110may provide an alert light signal. When the object OBJ approaches the user U and its movement speed increases, the alert light signal becomes more obvious. For example, the flashing frequency or brightness of the alert light signal increases. In some embodiments, the head mounted device100may provide an alert sound to alert the user U in step S240. When the object OBJ approaches the user U and its movement speed increases, the alert sound becomes more obvious. For example, the tempo of the alert sound may increase or the volume may increase.

In addition, in step S240, the second sensing device130captures the object image OIMG of the object OBJ in response to the notification signal SN. The display unit110displays the object image OIMG of the object OBJ.

In step S250, the alert provided by the head mounted device100is adjusted or disarmed. For example, when the user U knows about that the object OBJ is approaching through the display unit110, the user U may move away from the object OBJ or move the object OBJ to a safe region. Therefore, the user U disarms the alert through the head mounted device100. For example, when the user U knows about through the display unit110that the approaching object OBJ will not cause harm, the user U adjusts the alert conditions through the head mounted device100. Therefore, the processor140may learn about the infrared image of the object OBJ that does not cause harm. For example, when the user U knows about through the display unit110that the specific range PR needs to be adjusted, the user U adjusts the specific range PR through the head mounted device100. Therefore, the alert conditions are also adjusted.

After step S250, the operating method S200returns to the operation of step S210.

In step S230, when the object OBJ within the specific range PR does not approach or move away from the user U, this means that the object OBJ stays around the user U without moving. For example, the processor140determines that the size of the outline of the infrared image IRIMG within the specific range PR has not changed. Therefore, the processor140provides the notification signal SN in step S260. The second sensing device130captures the object image OIMG of the object OBJ in response to the notification signal SN. The display unit110displays the object image OIMG of the object OBJ. In addition, the head mounted device100alerts the user U based on the notification signal SN.

In step S270, when the object OBJ continues to stay, the user U may selectively disarm the alert provided by the head mounted device100.

After step S270, the operating method S200returns to the operation of step S210.

Referring toFIG.1,FIG.2, andFIG.6at the same time,FIG.6is a flowchart of an operating method according to an embodiment of the disclosure. The operating method S300is configured for the head mounted device100. The operating method S300includes steps S310to S350. The first sensing device120detects the surrounding of the user U in step S310. For example, in step S310, the first sensing device120detects the surrounding of the user U to provide infrared data IRD corresponding to the infrared image IRIMG.

In step S320, the processor140determines whether there is a high temperature region around the user U. The high temperature region is, for example, a heat source having a temperature greater than a predetermined temperature. In step S320, the processor140may determine whether there is a high temperature region around the user U by using the infrared data IRD. When there is no high temperature region around the user U, the operating method S300returns to the operation of step S310.

On the other hand, when there is a high temperature region around the user U, the processor140further determines changes in the high temperature region in step S330.

In step S330, when the high temperature region does not change over time, this means that the high temperature region may be a fixed heat source (e.g., a heater or an electric lamp). Therefore, the processor140does not provide the notification signal SN. The operating method S300returns to the operation of step S310.

In step S330, when the area of the high temperature region increases with time, it means that the heat source is gradually approaching the user U or the heat source is expanding. Therefore, the processor140provides the notification signal SN in step S340. Therefore, the head mounted device100alerts the user U based on the notification signal SN. The second sensing device130captures a surrounding image in response to the notification signal SN. The display unit110displays the surrounding image.

In addition, when the temperature of the high temperature region increases rapidly, the processor140also provides the notification signal SN in step S340. The head mounted device100alerts the user U. The second sensing device130captures the surrounding image. The display unit110displays the surrounding image.

Referring toFIG.1andFIG.7at the same time,FIG.7is a schematic diagram of a head mounted device according to an embodiment of the disclosure.FIG.7shows a schematic diagram of the head mounted device200from different viewing angles. In this embodiment, the head mounted device200includes a display unit (not shown), a first sensing device220, a second sensing device230, a headband250, and an eye mask260. The display unit is disposed on the eye mask260. The head mounted device200may be worn on the head of the user U through the headband250. The first sensing device220includes first sensors220_1and220_2. The second sensing device230includes second sensors230_1to230_4. In this embodiment, the first sensors220_1and220_2are disposed on the headband250and the eye mask260. The second sensors230_1to230_4are disposed on the headband250and the eye mask260.

Taking this embodiment as an example, the first sensor220_1is disposed on the front surface of the eye mask260. The first sensor220_2is disposed on the headband250. When the user U wears the head mounted device200, the first sensor220_1detects toward the front of the user U. The first sensor220_2detects toward the rear of the user U.

The second sensor230_1is disposed on the front surface of the eye mask260. The second sensor230_2is disposed on the headband250. The second sensor230_3is disposed on the left surface of the eye mask260. The second sensor230_4is disposed on the right surface of the eye mask260.

Taking this embodiment as an example, the detectable angle (or viewing angle) of the first sensors220_1and220_2is approximately 180°. The detectable angle of the second sensors230_1to230_4may be approximately 120°. Based on the configuration ofFIG.7, the first sensing device220may detect the infrared image around the user U. The second sensing device230may capture the visible light image around the user U.

This embodiment takes two first sensors220_1and220_2and four second sensors230_1to230_4as an example, but the disclosure is not limited thereto. The disclosure may determine the placement position of the first sensor and the number of the first sensor based on the detectable angle and/or the detectable wavelength of the first sensor. The disclosure may determine the placement position of the second sensor and the number of the second sensor based on the detectable angle of the second sensor.

Referring toFIG.1andFIG.8at the same time,FIG.8is a schematic diagram of a head mounted device according to an embodiment of the disclosure. In this embodiment, the head mounted device200′ includes a display unit (not shown), a first sensing device220, a second sensing device230, a headband250, and an eye mask260. The first sensing device220includes first sensors220_1and220_2. The second sensing device230includes second sensors230_1to230_5.

Taking this embodiment as an example, the first sensor220_1is disposed on the front surface of the eye mask260. The first sensor220_2is disposed on the headband250. When the user U wears the head mounted device200, the first sensor220_1detects toward the front of the user U. The first sensor220_2detects toward the rear of the user U.

The second sensors230_1and230_2are disposed on the front surface of the eye mask260. The second sensor230_1is disposed on the eye mask260at a position corresponding to the left eye of the user U. The second sensor230_2is disposed on the eye mask260at a position corresponding to the right eye of the user U.

The second sensor230_3is disposed on the headband250. The second sensor230_4is disposed on the right surface of the eye mask260. The second sensor230_5is disposed on the left surface of the eye mask260.

Based on the configuration ofFIG.8, the first sensing device220may detect the infrared image around the user U. The second sensing device230may capture the visible light image around the user U.

In addition, it should be noted that the disposed positions of the second sensors230_1and230_2correspond to the positions of both eyes of the user U. The visible light images captured by the second sensors230_1and230_2help generate a three-dimensional image.

Referring toFIG.9,FIG.9is a schematic diagram of a display unit and a first sensor according to an embodiment of the disclosure. In this embodiment,FIG.9shows the display unit210and the first sensor220_1. In this embodiment, the display unit210includes multiple display pixels PD and a substrate SB. The display pixels PD are disposed on the substrate SB. The first sensor220_1includes multiple sensing pixels PS. The sensing pixels PS may be disposed in an array on the substrate SB. In other words, the first sensor220_1and the display pixels PD of the display unit210are disposed on the same substrate SB.

In this embodiment, the display unit210is a transparent display panel. The substrate SB may be a glass substrate (but the disclosure is not limited thereto). In some embodiments, the substrate SB may be a flexible substrate. In this embodiment, the layout positions of the display pixels PD are substantially the same as the layout positions of the sensing pixels PS. In addition, the size and position of the display pixels PD are substantially the same as the size of the sensing pixels PS. Therefore, corresponding regions between the display pixels PD and the sensing pixels PS may have transparency.

In this embodiment, the transparency of the display unit210is adjusted so that the user may view the external environment through the display unit210. In this way, the user may view the external environment without taking off the head mounted device.

In this embodiment, each of the sensing pixels PS is a micro electro mechanical (MEM) structure. The sensing pixels PS may each include pads PAD1and PAD2, a resistive structure CN, and a sensing structure SL. The resistive structure CN is electrically connected to the pads PAD1and PAD2. The sensing structure SL partially covers the resistive structure CN and is in contact with the resistive structure CN. The sensing structure SL may change the impedance value of the resistive structure CN according to infrared. The sensing structure SL may be a heat-absorbing structure, metal, or a material that easily absorbs the infrared band. The first sensor220_1provides infrared data corresponding to the infrared image (infrared data IRD of the infrared image IRIMG shown inFIG.2) according to changes in the impedance value. The first sensor220_1can, for example, receive the signal current generated by the impedance change of the sensing pixel PS through the pads PAD1and PAD2.

Referring toFIG.9andFIG.10at the same time,FIG.10is a schematic diagram of a display unit and a first sensor according to an embodiment of the disclosure. In this embodiment,FIG.10shows the display unit210and the first sensor220_1. The first sensor220_1is attached to the display unit210. For example, the display pixels PD are disposed on the first side of the substrate SB. The first sensor220_1is attached on the second side of the substrate SB. The second side is opposite to the first side. The positions of the display pixels PD correspond to the positions of the sensing pixels PS. Therefore, the region between the display pixels PD has transparency.

Referring toFIG.7andFIG.11at the same time,FIG.11is a schematic diagram of a display unit and a mask according to an embodiment of the disclosure. In this embodiment, the head mounted device200further includes a mask270. The display unit210is a transparent display panel. The mask270is operated to cover the display unit210. Therefore, the mask270may block the light L from the external environment. The immersive experience of the head mounted device200may be enhanced. On the other hand, the mask270is moved to not cover the display unit210. The light L from the external environment penetrates the display unit210. Therefore, the user views the external environment through the display unit210.

Referring toFIG.9andFIG.12Aat the same time,FIG.10is a schematic diagram of a display unit, a first sensor, and a mask according to an embodiment of the disclosure. In this embodiment, the head mounted device200further includes a mask270. The display unit210is a transparent display panel. The first sensor220_1is attached to the display unit210. There may be transparency between the display pixels PD and the sensing pixels PS. The light L from the external environment may penetrate the first sensor220_1and the display unit210.

In this embodiment, the mask270is operated to cover the display unit210and the first sensor220_1, thereby blocking the light L from the external environment. Therefore, the immersive experience of the head mounted device200may be enhanced. On the other hand, the mask270is moved to not cover the display unit210. The light L from the external environment penetrates the display unit210and the first sensor220_1. Therefore, the user may view the external environment through the display unit210and the first sensor220_1.

Referring toFIG.9andFIG.12Bat the same time,FIG.10is a schematic diagram of a display unit, a first sensor, and a mask according to an embodiment of the disclosure. In this embodiment, the display unit210is a transparent display panel. The first sensor220_1is not attached to the display unit210. However, the positions of the display pixels PD correspond to the positions of the sensing pixels PS. Therefore, the light L from the external environment may still penetrate the first sensor220_1and the display unit210. When the mask270is operated to cover the display unit210, the mask270is located between the first sensor220_1and the display unit210. The mask270may block the light L from the external environment. The immersive experience of the head mounted device200may be enhanced. On the other hand, the mask270is moved to not cover the display unit210. The light L from the external environment penetrates the display unit210. Therefore, the user may view the external environment through the display unit210and the first sensor220_1.

To sum up, whether there is an object causing harm to the user within a specific range is detected by the first sensing device. When an object causing harm to the user within the specific range is detected, the display unit displays the object image of the object. In this way, the head mounted device may know about that there is an object causing harm to the user within a specific range, and display the object image of the object through the display unit. The usage safety of the head mounted device may be improved. Furthermore, in one embodiment, the first sensing device is an infrared detection device. The head mounted device detects the environment around the user by preferentially using the first sensing device. The infrared image shows the outline of the object around the user, but does not show the real visual appearance of the object around the user. Therefore, the environment around user is not leaked. The privacy of user is ensured. In addition, when the environment is dark, the head mounted device may also determine whether there is an object causing harm to the user within the specific range.

Finally, it should be noted that the foregoing embodiments are only used to illustrate the technical solutions of the disclosure, but not to limit the disclosure; although the disclosure has been described in detail with reference to the foregoing embodiments, persons of ordinary skill in the art should understand that the technical solutions described in the foregoing embodiments may still be modified, or parts or all of the technical features thereof may be equivalently replaced; however, these modifications or substitutions do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the disclosure.