Head-worn display device, scientific or surgical imaging system and procedure

Abstract

Examples include a head-worn display device, a method for providing a head-worn display device, and a scientific or surgical imaging system with a head-worn display device. The head-worn display device comprises a display assembly (110) including one or more displays (112) for displaying the image. The head-worn display device includes a video processing assembly (120) comprising a processing circuit for generating at least one processed display signal for the one or more displays based on an input display signal. The head-worn display device includes a main mounting structure (130) for attaching the display assembly and the video processing assembly to the user's head.The weight of the display assembly and the video processing assembly and / or the positioning of the display assembly and the video processing assembly on the main mounting structure is such that the weight distribution between the front and the rear of the head-mounted display device is balanced.

Description

Technical area

[0001] Examples include a head-worn display device, a method for providing a head-worn display device, and a scientific or surgical imaging system with a head-worn display device. background

[0002] In microsurgery, a distortion-free, magnified stereoscopic view of the surgical field is often required. Digital stereomicroscopes can provide such views. The image can be viewed through eyepieces on the microscope or displayed on an external screen or via head-mounted displays. Since surgical procedures often last several hours, the ergonomics of the display device used must be considered. However, many head-mounted displays place a strain on the user, potentially leading to headaches, neck pain, or other forms of discomfort. Similar strain can also occur with users of virtual reality headsets, head-mounted augmented reality devices, or similar equipment.

[0003] There may be a desire to provide an improved concept for a head-worn display device, for example, for a head-worn display device for use with a surgical or scientific imaging device. Summary

[0004] This wish is fulfilled by the subject matter of the independent claims.

[0005] Several examples of independent claims are based on the finding that in many head-worn display devices, the balance between the front of the device, which typically contains the digital display(s), and the back, which often only contains a mechanism for mechanically adjusting a headband, is not taken into account. In many cases, head-worn display devices have a suboptimal weight distribution between the front and back.In various examples of the proposed concept, an improved balance between the front and back of the head-mounted display device is achieved by dividing the functionality of the device into a display assembly located at the front and a video processing assembly located at the back. This video processing assembly generates a processed display signal that drives the display(s) of the display assembly. Both the display assembly and the video processing assembly are held by a main mounting structure, and the weight and / or positioning of the display assembly and the main mounting structure are such that a balance between the front and back of the head-mounted display device is achieved. In other words, a balanced headset is provided.This provides a head-worn display device that can prevent discomfort such as headaches or neck pain when worn by a user, e.g., a surgeon during an operation. This makes the head-worn display device particularly suitable for use in surgical procedures, such as microsurgical or ophthalmic procedures.

[0006] Some aspects of the present disclosure relate to a head-worn display device for displaying an image. The head-worn display device comprises a display assembly with one or more displays for showing the image. The head-worn display device comprises a video processing assembly with a processing circuit for generating at least one processed display signal for the one or more displays based on an input display signal. The head-worn display device comprises a main mounting structure for attaching the display assembly and the video processing assembly to the user's head.The weight of the display assembly and the video processing assembly, and / or their positioning on the main mounting structure, is selected to ensure a balanced weight distribution between the front and back of the head-worn display device. This provides a head-worn display device that can prevent discomfort such as head or neck pain when worn by a user, such as a surgeon during an operation.

[0007] For example, the weight of the display and video processing assembly and / or the positioning of the display and video processing assembly on the main mounting structure can be such that the center of gravity of the head-worn display device lies on (or is orthogonal to) a midpoint of an imaginary line between the display and video processing assembly. Placing the center of gravity at this point can position it above the spine of the user wearing the head-worn display device, which can help avoid the aforementioned discomfort.

[0008] In various examples, the imaginary line extends from a center of gravity of the display unit to a center of gravity of the video processing unit. For instance, when using a single display, the imaginary line might extend from a center point of the display, or when using two displays, from a center point between the two displays to a center point of the processing circuitry. The displays and processing circuitry are typically located at or near the center of gravity of their respective assemblies and can therefore serve as reference points for balancing the head-mounted display device.

[0009] According to one example, at least one of the weights of the display assembly and the video processing assembly, and the positioning of the display assembly and the video processing assembly on the main mounting structure, can be selected such that the weight distribution between the front and back of the head-worn display device is substantially equal (e.g., substantially symmetrical between the front and back). In this way, a head-worn display device is provided that can avoid discomfort such as headaches or neck pain when worn by a user, e.g., a surgeon during an operation, because the user's head is not pulled forward or backward.

[0010] For example, the weight of the video processing unit can be no more than 50% greater than the weight of the display unit. Choosing a weight that makes the display unit lighter or the same as the video processing unit can increase comfort during surgery, as the surgeon's head is typically tilted slightly downwards during the procedure.

[0011] In various examples, the main support structure may comprise a first headband and a second headband, with the first headband positioned to cross the user's head while the head-worn display device is mounted on it, and the second headband positioned to encircle the user's head. According to one example, a center of gravity may be positioned orthogonally from a mid-segment of an imaginary line toward the first headband. In this way, a significant portion of the weight of the head-worn display device can be supported by the first headband across the user's spine, which may help to avoid the aforementioned discomfort.

[0012] According to one example, the video processing assembly can include at least one interface to deliver the at least one processed display signal to the one or more displays of the display assembly via at least one cable attached to the main mounting structure, and to receive the input display signal via an input cable. This cable between the video processing assembly and the display assembly can support the separation of the video processing circuitry from the display assembly, resulting in improved balance of the head-worn display device.

[0013] For example, the video processing circuit can be configured to split the input display signal into two processed display signals for two displays on the display unit. Additionally or alternatively, the video processing circuit can be configured to adjust at least one brightness, one x / y shift, and one white balance in the at least one processed display signal. Additionally or alternatively, the video processing circuit can be configured to generate the at least one processed display according to at least one calibration parameter. Thus, the video processing assembly can perform any video processing carried out by the head-mounted display device.These types of video processing can make the head-worn display device less dependent on the source of the input display signal, so that the same input display signal can be supplied to different head-worn display devices and then tailored to the individual user or head-worn display device by the processing circuitry of each device.

[0014] As described above, the video processing assembly comprises the processing circuitry used to generate the processed display signal(s) for one or more displays. This processing circuitry can be housed on a printed circuit board (PCB), which may also include the interfaces for the cable to the display assembly and the input cable. To protect the PCB containing the processing circuitry and interfaces, it can be enclosed in a housing. In other words, the video processing assembly can consist of a housing and a PCB containing the processing circuitry.

[0015] In some examples, the housing and circuit board may have holes to allow the passage of a shaft for a size adjustment mechanism to adjust the circumference of the main mounting assembly. Passing the shaft through the housing and circuit board enables a more compact design of the video processing assembly with a center of gravity that is easier to balance with the display assembly.

[0016] Some components of the head-worn display device can perform multiple functions. For example, the rear wall (e.g., the back cover) of the housing can serve both as a counterweight for the typically heavy display unit and as a heat sink for the processing circuitry. For instance, at least one wall of the housing can be made of metal and act as a heat sink for the processing circuitry. This at least one wall can be positioned to face away from the head-worn display device, thus directing heat away from the user / surgeon. Furthermore, the at least one metal wall can act as a counterweight for the display assembly, helping to balance the head-worn display device.

[0017] As explained above, such a head-worn display device can be used by a surgeon as a viewer during a surgical procedure. Accordingly, the processing circuitry of the video processing assembly can be configured to receive the input display signal from a scientific or surgical imaging device of a scientific or surgical imaging system. Another aspect of the present disclosure relates to a scientific or surgical imaging system comprising a scientific or surgical imaging device and the head-worn display device. For example, the scientific or surgical imaging device can be configured to supply the input display signal to the head-worn display device.This provides a head-worn display device that can avoid discomfort such as headaches or neck pain when worn by a surgeon during an operation.

[0018] Some aspects of the present disclosure relate to a method for providing a head-mounted display device. The method comprises arranging a display assembly, comprising one or more displays for showing the image, on a main mounting structure of the head-mounted display device, the main mounting structure being suitable for attaching the display assembly and the video processing assembly to the user's head. The method also includes arranging a video processing assembly with a processing circuit for generating at least one processed display signal for the one or more displays based on an input display signal at the main mounting structure.At least one of the weight of the display assembly and the video processing assembly and the positioning of the display assembly and the video processing assembly on the main mounting structure is such that a weight distribution between the front and the back of the head-mounted display device is balanced. Brief description of the characters

[0019] Some examples of devices and / or methods are described below only by way of example and with reference to the accompanying illustrations, in which: Fig. shows a schematic diagram of a side view of an example of a head-worn display device; Fig. shows another schematic diagram of a side view of an example of a head-worn display device, illustrating the placement of the head-worn display device on a user's head; Fig. shows a schematic diagram of a front view of an example of a head-worn display device; Fig. shows another schematic diagram of a side view of an example of a head-worn display device, showing a cable routed between a video processing assembly and a display assembly; Fig. shows a schematic representation of a sectional view of a video processing assembly and a size adjustment mechanism of an example of a head-worn display device; Fig. Figure 2 shows a schematic diagram of an example of a scientific or surgical imaging device; and Fig. shows a flowchart of an example of a method for providing a head-worn display device. Detailed description

[0020] Several examples will now be described in more detail with reference to the accompanying drawings, which illustrate some of these examples. The thicknesses of the lines, layers, and / or areas may be exaggerated in the illustrations for clarity.

[0021] Fig. Figure 1a shows a schematic diagram of a side view of an example of a head-mounted display device 100 for displaying an image. The in Fig. The head-mounted display device 100 shown in Figure 1a comprises a display assembly 110 on its front side, which includes one or more displays 112 for displaying the image. The Fig. The head-mounted display device 100 shown in Figure 1a further comprises a video processing assembly 120 on its rear side, which includes a processing circuit for generating at least one processed display signal for the one or more displays based on an input display signal. The display assembly 110 and the video processing assembly can be attached to the user's head via a main mounting structure 130. The main mounting structure 130 serves to attach the display assembly and the video processing assembly to the user's head. The division of functionality of the head-mounted display device allows for improved weight distribution of the head-mounted display device and thus improved placement of the center of gravity.In particular, the weight of the display unit and the video processing unit, and / or the positioning of the display unit and the video processing unit on the main mounting structure, is such that the weight distribution between the front and rear of the head-mounted display device is balanced. In this context, the front and rear are aligned with the direction of view of the user wearing the head-mounted display device, with the front being located on the display assembly (i.e., in the direction the user is looking) and the rear being located on the video processing assembly (i.e., at the back of the head).

[0022] A head-mounted display (HMD) is a wearable device designed to be worn on the head like a helmet or goggles. It consists of one or more screens, along with other electronic components, positioned in front of the user's eyes. Head-mounted display devices can be used for a variety of applications, such as virtual reality gaming, medical training, surgery, and more. Fig. The head-mounted display device 100 shown in Figure 1a is designed such that the weight is balanced between the front and back of the head-mounted display device. For this purpose, the electronics of the head-mounted display device, i.e., the video processing assembly, are located at the back of the head-mounted display device and thus at the back of the head, e.g., to achieve a substantially equal weight distribution between the front and back. Fig. Figure 1b shows another schematic side view of an example of the head-worn display device 100, illustrating the placement of the head-worn display device on a user's head. As shown in Fig. As shown in Figure 1b, the center of gravity 144 (further represented by the downward-pointing arrow above the center of gravity) of the head-worn display device can be placed on top of the spine 146. This can result in a comfortable wearing experience with the headset, thus avoiding headaches, neck pain, or other discomfort when wearing the head-worn display device. To further illustrate the effects of the following, see Figure 1b. Fig. The construction of the head-worn display device 100 discussed in sections 1a to 1e is in Fig. Figure 1c shows a front view of the head-worn display device 100. Fig. Figure 1c shows a schematic representation of a front view of an example of the head-worn display device 100.

[0023] This in connection with the Fig. The head-mounted display device 100 shown consists of three main components: the display assembly 110, the video processing assembly 120 and the main mounting structure 130.

[0024] The display assembly 110 is the component of the head-worn display that shows the image to the user. It comprises one or more displays 112 for displaying the image. In some examples, as in the Fig. As shown in Figures 1a to 1d, two separate displays 112 can be used, one for each eye. Alternatively, a single display 112 can be used, e.g., a single display for both eyes or a single display for only one eye, with the image not displayed for the other eye. The display(s) 112 can be, for example, an LCD (liquid crystal display), a TFT (thin-film transistor display), or an OLED (organic light-emitting diode display). The display diagonal of each of the displays 112 can be at least 0.5 inches (or at least 0.6 inches) and / or at most 1 inch (or at most 0.8 inches), particularly when two separate displays are used.The display(s) 112 can be combined with an optical arrangement comprising one or more optical elements, such as one or more lenses, to improve the user's view of the display(s) 112 and / or to perform diopter adjustment for the user's eyes (separately).

[0025] The in the Fig. The display assembly 110 shown in Figures 1a to 1d further comprises an optional tilting mechanism 114 with which the display(s) 112 (with the optical arrangement) can be tilted upwards so that the display(s) 112 are no longer in the user's field of vision. The tilting mechanism 114 is attached to the connector 116 and to the display(s) 112. It can be tilted using handles (which are shown in Figures 1a to 1d). Fig. 1b are visible) on both sides of the tilting mechanism 114 can be moved manually between the position in front of the user's eyes and the upward-facing position.

[0026] Furthermore, the display unit 110 includes an optional rotary knob 118 for adjusting the interpupillary distance between the displays 112. The rotary knob 118 is attached to an adjustment mechanism configured to adjust (i.e., vary) the distance between the two displays 112 of the display assembly 110 and thus the interpupillary distance. The rotary knob 118 is located in the center of the display unit 110.

[0027] While the display assembly 110 is arranged on the front of the head-mounted display device 100, the video processing assembly 120 is arranged on the other side, i.e., the rear, of the head-mounted display device to serve as a counterweight for the display assembly 110. Further details about the video processing assembly will be given in connection with Fig. 1e discussed.

[0028] To improve the front-to-back balance of the head-mounted display device, the display assembly 110 and the video processing assembly 120 are arranged on opposite sides of the main mounting structure 130, with the arrangement and weight of the respective assemblies being selected to ensure balance of the head-mounted display device. In other words, the electronics, e.g., including a heat sink, for the display(s) 112 are located on the rear of the head-mounted display device, so that the weight is distributed substantially evenly between the front and rear.More generally, the weight of the display assembly and the video processing assembly, and / or the positioning of the display assembly and the video processing assembly on the main mounting structure, is such that the weight distribution between the front and rear of the head-worn display device is balanced. In this context, "balanced" is not an absolute term—it is used only to distinguish head-worn displays from those that have a weight distribution where more than two-thirds of the weight is concentrated either on the front or the rear of the head-worn display device. In other words, the head-worn display device can be considered balanced if less than two-thirds (or at most 60% or at most 55%) of the weight of the head-worn display device is distributed on either side (e.g., the front or the rear).(on the front and rear parts) of the head-mounted display device. This can be achieved by balancing the weight and placement of the individual components so that the center of gravity lies laterally towards the center of the head-mounted display device.

[0029] In the Fig. Various visual methods are presented to explain the effect. Fig. 1a and Fig. Figure 1b shows an imaginary line 140 between the display unit 110 (e.g., the displays of the display unit) and the video processing unit 120. The imaginary line can, for example, extend from a center of gravity of the display assembly to a center of gravity of the video processing assembly (e.g., when the display assembly 110 is in front of the eyes and is not tilted upwards). Alternatively (although the result may be similar), when using a single display 112, the imaginary line can extend from a center point of the display, or when using two displays, from a center point between the two displays 112 to a center point of the processing circuitry of the video processing assembly 120 (e.g., when the display assembly 110 is in front of the eyes and is not tilted upwards).

[0030] This imaginary line 140 includes a middle section 142 which, for example, occupies 20% (or 30% or 40%) of the length of the imaginary line 140 in the middle (i.e. centered around the middle) of the imaginary line 140 (i.e. extends along it). Fig. 1a and Fig. 1b further shows the center of gravity 144, which is located in the Fig. 1a and Fig. The example shown in Figure 1b is located near the position of joint 138a. However, since the head-mounted display device 100 is a three-dimensional object, its center of gravity lies midway between the two joints 138a located on either side of the head-mounted display device. The center of gravity of the head-mounted device can be located on this central segment of the imaginary line or laterally offset from it (e.g., at an orthogonal angle). In other words, the weight of the display assembly and the video processing assembly, and / or the positioning of the display assembly and the video processing assembly on the main mounting structure, can be chosen such that the center of gravity 144 of the head-mounted display device lies on the central segment 142 of an imaginary line 140 between the display assembly and the video processing assembly, or is orthogonally offset from it.

[0031] It should be noted that this particular center of gravity is only one example; the proposed concept is applicable to a wide range of possible center of gravity positions. While a perfect 50% / 50% front-to-back weight distribution may be desirable in some cases, a 60% / 40% or 40% / 60% weight distribution may also be convenient in practice. For example, the weight of the display and video processing assembly and / or the positioning of the display and video processing assembly on the main mounting structure may be chosen such that the weight distribution between the front and rear of the head-mounted display device is essentially equal.For example, between 40% and 60% (or between 45% and 55% or between 47% and 53%) of the weight of the head-worn display device can be distributed to the front of the device (relative to a geometric center of the head-worn display device), and the remaining weight of the head-worn display device to the back of the device (relative to a geometric center of the head-worn display device). In some examples, it may even be desirable to have slightly more weight at the back, since surgeons often work with their heads tilted slightly downwards, which would be uncomfortable with additional weight at the front. For example, the weight of the video processing unit 120 may be greater than the weight of the display unit 110.For example, the weight of the video processing assembly can be at most 50% (or at most 40%, at most 25% or at most 10%) greater than the weight of the display assembly.

[0032] The main mounting structure 130 serves to attach, secure, fix, and / or mount the display unit 110 and the video processing unit 120 to a user's head. The main mounting structure 130 can have various structural features to enable secure and stable attachment of the head-worn display device 100 to a user's head. For example, the main mounting structure 130 can include one or more headbands 132, 134, 136, a head strap, an adjustable frame, and / or a head suspension assembly configured to distribute the weight of the head-worn display device 100 across the user's head. In the Fig. In the example shown in 1a to 1d, the main fastening structure 130 is depicted with two headbands: a first headband 136 that crosses the user's head (i.e., passes over the user's head), and a second headband 132, 134 that extends around the user's head. The center of gravity 144 can, for example, be offset orthogonally from the mid-segment 142 of the imaginary line 140 in the direction of the (center point of the) first headband 136.

[0033] In the example of the Fig. In figures 1a to 1d, the first headband 136 is arranged such that it crosses the head of the user of the head-worn display device parallel to the display unit. Alternatively, the first headband 136 can also be arranged from front to back. In the figures described in the Fig. In the example shown in Figures 1a to 1c, the second headband 132, 134 comprises a front part 132 and a rear part 134, which are connected to each other by a connecting piece 138 on both sides of the user's head. Furthermore, the first headband 136 is connected to the connecting piece. In the example shown in the Fig. In the example shown in 1a to 1d, the first headband 136 is fixedly connected to the connecting piece 138, while the front and rear parts 132, 134 of the second headband are movably connected to the connecting piece 138. For this purpose, the Fig. The connecting piece 138 shown in Figures 1a to 1d is a joint or joint element 138a to which the front and rear sections 132, 134 of the second headband are movably connected. The front section 132 of the second headband is also connected to the display unit 110, for example, via a connector 116 of the display unit 110. The rear section 134 of the second headband is also connected to the video processing unit 120. This headband configuration is only one example, and other configurations are possible, for example, with the first headband attached directly to the display assembly 110 and the video processing assembly 120, and with the second headband not being divided into a front and a rear section.

[0034] The main mounting structure 130 can be configured to support the weight (e.g., the entire weight) of the display device 110 and the video processing device 120. For example, less than 40% (or less than 50%, less than 30%, or less than 20%) of the weight of the head-mounted display device, or no weight of the head-mounted display device, can rest on the user's nose (e.g., by means of a nosepiece).

[0035] To enable the separation of the display assembly 110 and the video processing assembly 120 at the front and rear of the head-mounted display device 100, a cable can be used to transmit data, and in particular the processed display device, from the processing circuit of the video processing assembly 120 to the display(s) 112 of the display assembly 110. In other words, the data can be transmitted to the front part via cables. Fig. Figure 1d shows another schematic side view of an example of a head-worn display device, showing a cable 170 (or rather, cables) routed (on both sides) between the video processing assembly 120 and the display assembly 110. The video processing assembly 120 (and the respective display 112) can each have an interface for the cable 170. In addition, the video processing assembly 120 can have an interface (which can be the same or a different interface) for an input cable 150, which is used to supply the input display signal to the video processing assembly 120. In summary, the video processing assembly can have at least one interface for supplying the at least one processed display signal to the one or more displays of the display assembly via at least one cable (e.g.,two cables, one for each display 112), which is attached to the main mounting structure (via the in . Fig. 1d shown cable clamps 138b, 138c) is attached, and include for receiving the input indicator signal via the input cable 150.

[0036] The processing circuit of the video processing assembly is used to perform video processing tasks within the head-worn display device. Specifically, the processing circuit is configured to generate the at least one processed display signal (e.g., two processed display signals) for the one or more displays 112 based on the input display signal. To generate the at least one processed display signal, the processing circuit can perform various video processing tasks. For example, if two separate displays 112 are used, the video processing circuit can be configured to split the input display signal into two processed display signals for the two displays 112 of the display assembly, for example, to supply a portion of the input display signal to each display 112.The input display signal may, for example, contain a stereoscopic video signal (e.g., with a left and a right channel), such as a stereoscopic video signal from a stereoscopic scientific or surgical imaging device. The processing circuit may be configured to split the stereoscopic video signal into two channels and route one of the channels to each of the two displays 112. Furthermore, the processing circuit may be used to adjust the image displayed by each display 112 to the specific head-mounted display device, e.g., according to user preferences. For example, the video processing circuit may be configured to apply at least one brightness setting, one x / y shift (e.g.,a spatial relationship between the two channels provided to the two displays 112 for the horizontal and vertical alignment of the two displays 112 (which may differ for different interpupillary distances) and sets a white balance in the at least one processed display signal. For example, properties such as brightness, x / y shift, and white balance may be typical for the specific head-worn display device (e.g., depending on the physical properties of the display(s) and / or the range of supported interpupillary distances) and may be defined by a calibration parameter specific to the head-worn display device.The x / y shift can, for example, refer to the horizontal and vertical alignment of the image displayed on the two displays 112, whereby the processed display signal is electronically shifted so that the left and right channels are aligned. Accordingly, the video processing circuit can be configured to generate at least one processed display according to at least one calibration parameter.

[0037] An example of the construction of the video processing module 120 is shown in Fig. 1e shown. Fig. Figure 1e shows a schematic diagram of a sectional view of an example of the video processing assembly 120. The video processing assembly 120 can comprise a housing 122, 124 and a printed circuit board 126, which houses the processing circuitry (not shown). In the Fig. In the example shown, the housing comprises a first component (with one or more walls) 124, which faces the rest of the head-mounted display device (e.g., the main mounting structure 130 (in Fig. 1e shown on the left), and a second component (with one or more further walls 122) facing away from the rest of the head-mounted display device. The second component can, for example, be considered the rear cover of the housing of the video processing assembly 120.

[0038] The in the Fig. The head-worn display device 100 shown in Figures 1a to 1e further includes an optional size adjustment mechanism 160 for adjusting the circumference (e.g., the length of the rear section 134 of the second headband) of the main mounting structure 130. The size adjustment mechanism 160 comprises a rotary knob, a shaft 162, and a gear connected to the rear section(s) of the headband to adjust the circumference of the main mounting structure 130. The size adjustment mechanism 160 can, for example, be a ratchet mechanism. To improve the placement of the rotary knob, the housing and the circuit board have holes that pass through the shaft 162 of the size adjustment mechanism 160. In other words, in the video processing assembly 120, the circuit board 126 can have a hole through which the shaft of the ratchet mechanism can pass through the electronics. This can reduce the space required for the video processing assembly 120.

[0039] The rear cover 122 of the video processing assembly 120 can serve a dual purpose: it can be used to balance the weight distribution of the head-worn display device (by being made of metal, such as aluminum), and, since it is made of metal, it can also be used as a heat sink for the processing circuits. For example, at least one wall 122 of the housing, such as the rear cover 122, can be made of metal and serve as a heat sink for the processing circuits. For example, an aluminum plate can be used as the rear wall and thus also as a heat sink for the electronics (e.g., the processing circuits and the rear interface(s)). To prevent the heat from affecting the wearer's comfort, the wall serving as a heat sink can face away from the user. In other words, the at least one wall serving as a heat sink (e.g.,The rear cover can be positioned so that it faces away from the head-mounted display device. The metal plate (e.g., made of aluminum) can also help to balance the weight of the head-mounted display device (front and rear). For example, at least one metal wall can serve as a counterweight for the display unit. Furthermore, the rear cover 122 can be used as a mounting plate for cables, fiber optic O-rings, etc.

[0040] The interfaces of the video processing assembly, which can be arranged on the circuit board and connected to the processing circuits, can correspond to one or more inputs and / or outputs for receiving and / or transmitting information. This information may be in the form of digital (bit) values ​​according to a specific code within a module, between modules, or between modules of different units. The interfaces arranged on the circuit board can, for example, include interface circuits configured for receiving and / or transmitting information.

[0041] The processing circuitry of the video processing assembly can be implemented with one or more processing units, one or more processing devices, or any processing means such as a processor, a computer, or a programmable hardware component that can be operated with appropriately adapted software. In other words, the described function of the video processing assembly's processing circuitry can also be implemented in software, which is then executed on one or more programmable hardware components. Such hardware components can include a general-purpose processor, a digital signal processor (DSP), a microcontroller, etc.

[0042] Further details and aspects of the head-worn display device will be mentioned in connection with the proposed concept or one or more of the examples described above or below (e.g. Fig. 2 to 3). The head-worn display device may have one or more additional optional features corresponding to one or more aspects of the proposed concept or to one or more of the examples described above or below.

[0043] The ones associated with the Fig. The head-worn display device described in 1a to 1e can, for example, be used to view images produced by a scientific or surgical imaging device of a scientific or surgical imaging system, such as a scientific or surgical imaging device 210 of the scientific or surgical imaging system 200. Fig. 2. Fig. Figure 2 shows a schematic representation of an example of a scientific or surgical imaging system. The scientific or surgical imaging system 200 comprises the scientific or surgical imaging device 210 and, optionally, the head-worn display device 100. Alternatively, the head-worn display device 100 can be connected to the scientific or surgical imaging system 200. For example, the processing circuitry of the video processing assembly can be configured to receive the input display signal from the scientific or surgical imaging device 210 of the scientific or surgical imaging system 200. Accordingly, the scientific or surgical imaging device 210 can be configured to supply the input display signal to the head-worn display device 100.For example, the input display signal can consist of a (stereoscopic) video stream based on data from the image sensor of the scientific or surgical imaging device.

[0044] An example of such a scientific or surgical imaging device is, as in Fig. Shown is an operating microscope, which is a type of surgical imaging device. A microscope is an optical instrument used to view and magnify small objects, usually too small to see with the naked eye. It uses a combination of lenses and light to create a magnified image of the object being viewed. An operating microscope is a microscope used in surgical procedures. Alternatively, the surgical imaging device could also be a surgical exoscope or a surgical endoscope. Exoscopes are camera-based imaging systems, particularly camera-based 3D imaging systems, that are capable of providing images of surgical sites with high magnification and great depth of field. Compared to purely optical or hybrid microscopes, which can be used via eyepieces, exoscopes are used only with display modalities such as monitors or head-mounted displays.An endoscope is a medical instrument consisting of a flexible tube with a light and camera attached. Endoscopes are used to examine the inside of the body, for example, during a surgical procedure.

[0045] Alternatively, the scientific or surgical microscope system could be a scientific microscope system, such as a system with a laboratory microscope for use in a scientific environment.

[0046] Further details and aspects of the scientific or surgical imaging system and / or the head-worn display device will be mentioned in connection with the proposed concept or one or more of the examples described above or below (e.g. Fig. 1a to 1e, 3). The scientific or surgical imaging system and / or the head-worn display device may have one or more additional optional features corresponding to one or more aspects of the proposed concept or to one or more of the examples described above or below.

[0047] Fig. Figure 3 shows a flowchart of an example of a method for providing a head-worn display device, as used in conjunction with the Fig. The method comprises the head-worn display device 100 described in Figures 1a to 1e. The method includes arranging a display assembly 310 with one or more displays for showing the image on a main mounting structure of the head-worn display device. The main mounting structure is suitable for attaching the display assembly and the video processing assembly to the user's head. The method also includes arranging a video processing assembly with a processing circuit for generating at least one processed display signal for the one or more displays based on an input display signal on the main mounting structure.The weight of the display assembly and the video processing assembly and / or the positioning of the display assembly and the video processing assembly on the main mounting structure is such that the weight distribution between the front and the rear of the head-mounted display device is balanced.

[0048] For example, the procedure can be carried out to identify the issues associated with one of the Fig. to obtain the head-worn display device shown in 1a to 1e. Features related to the head-worn display device 100 of the Fig. Items 1a to 1e, which have been introduced, can also be included in the corresponding procedure.

[0049] Further details and aspects of the method will be mentioned in connection with the proposed concept or one or more examples described above or below (e.g. Fig.1a to 2). The procedure may include one or more additional optional features corresponding to one or more aspects of the proposed concept or to one or more of the examples described above or below.

[0050] The term “and / or” used here includes all combinations of one or more of the listed points and can be abbreviated with “ / ”.

[0051] Although some aspects related to a device have been described, it is clear that these aspects also constitute a description of the corresponding process, where a block or device corresponds to a process step or a feature of a process step. Similarly, aspects described in connection with a process step also constitute a description of a corresponding block, element, or feature of a corresponding device. Reference symbol list 100 Head-worn display device 110 Display assembly 112 ads (n) 114 Tilting mechanism 116 connectors 118 Rotary knob 120 video editing units 122 Second component of the housing, back panel, wall 124 First component of the housing, wall 126 Printed circuit board 130 Main assembly structure 132 Front part of a second headband 134 Back part of a second headband 136 First headband 138 connectors 138a Joint, joint element 138b, 138c cable clamp 140 Imaginary line 142c Middle part of the imaginary line 144 Focus 146 User's spine 150 input cables 160 size adjustment mechanism 162 Shaft of a size adjustment mechanism 170 cables 200 Scientific or surgical imaging system 210 Scientific or surgical imaging instrument, operating microscope 310 Arrangement of a display unit 320 Arrangement of a video processing unit

Claims

[1] A head-mounted display device (100) for displaying an image, the head-mounted display device comprising: a display assembly (110) comprising one or more displays (112) for displaying the image; a video processing arrangement (120) comprising processing circuitry for generating at least one processed display signal for the one or more displays based on an input display signal; and a main mounting structure (130) for mounting the display unit and the video processing unit on the head of a user, where at least one of a weight of the display unit and the video processing unit and the positioning of the display and video processing assembly on the main mounting structure is such that the weight distribution between the front and rear of the head-mounted display device is balanced. [2] The head-mounted display device of claim 1, wherein at least one of the weight of the display assembly and the video processing assembly and the positioning of the display assembly and the video processing assembly on the main mounting structure is such that a center of gravity (144) of the head-mounted display device is offset at a mid-portion (142) of an imaginary line (140) between the display assembly and the video processing assembly or orthogonally thereto. [3] The head-mounted display device according to any one of claims 1 or 2, wherein the weight of the display assembly and the video processing assembly and / or the positioning of the display assembly and the video processing assembly on the main mounting structure is selected such that the weight distribution between the front and rear of the head-mounted display device is substantially equal. [4] The head-mounted display device according to any one of claims 1 to 3, wherein the weight of the video processing assembly is at most 50% greater than the weight of the display assembly. [5] The head-mounted display device according to any one of claims 1 to 4, wherein the main attachment structure comprises a first headband (136) and a second headband (132; 134), the first headband being arranged to cross the head of the user of the head-mounted display device, and the second headband being arranged to extend around the head of the user. [6] The head-mounted display device according to claim 5, wherein a center of gravity is orthogonally offset from a central portion of the imaginary line toward the first headband (136). [7] The head-mounted display device of any one of claims 1 to 6, wherein the video processing assembly comprises at least one interface for providing the at least one processed display signal to the one or more displays of the display assembly via at least one cable attached to the main mounting structure and for receiving the input display signal via an input cable (150). [8] The head-mounted display device according to any one of claims 1 to 7, wherein the video processing circuit is configured to split the input display signal into two processed display signals for two displays of the display arrangement, and / or wherein the video processing circuit is configured to adjust at least one of brightness, x / y shift, and white balance in the at least one processed display signal, and / or wherein the video processing circuit is configured to generate the at least one processed display according to at least one calibration parameter. [9] The head-mounted display device according to any one of claims 1 to 8, wherein the video processing assembly (120) comprises a housing (122; 124) and a circuit board (126) having the processing circuitry, the housing and the circuit board including holes for passing a shaft (162) of a size adjustment mechanism (160) for adjusting a circumference of the main mounting structure. [10] The head-mounted display device according to any one of claims 1 to 9, wherein the video processing assembly comprises a housing and a circuit board with the processing circuitry, wherein at least one wall (122) of the housing comprises a metal and serves as a heat sink for the processing circuitry. [11] The head-mounted display device of claim 10, wherein the at least one wall acting as a heat sink is arranged to face away from the head-mounted display device. [12] The head-mounted display device according to any one of claims 10 or 11, wherein the at least one metal wall serves as a counterweight for the display assembly. [13] The head-mounted display device of any one of claims 1 to 12, wherein the processing circuitry of the video processing arrangement is configured to receive the input display signal from a scientific or surgical imaging device of a scientific or surgical imaging system. [14] A scientific or surgical imaging system comprising a scientific or surgical imaging device and the head-mounted display device of claim 13, wherein the scientific or surgical imaging device is configured to provide the input display signal to the head-mounted display device. [15] A method of providing a head-mounted display device, the method comprising: Arranging (310) a display assembly having one or more displays for displaying the image on a main mounting structure of the head-mounted display device, the main mounting structure being suitable for attaching the display assembly and the video processing assembly to the head of a user; and Arranging (320) a video processing assembly comprising a processing circuit for generating at least one processed display signal for the one or more displays based on an input display signal on the main mounting structure, wherein at least one of a weight of the display assembly and the video processing assembly and a positioning of the display assembly and the video processing assembly on the main mounting structure is such that a weight distribution between the front and back of the head-mounted display device is balanced.

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