TW202235957A - Virtual reality headset having adjustable focal length - Google Patents

Abstract

A virtual reality (VR) headset having an adjustable focal length is provided. A virtual reality glasses body has a display screen and a frame by which the display screen is supported. A virtual image imaging component outputs a virtual image that is be displayed on the display screen and overlapped or is not overlapped with a real image. A focus adjuster may adjust the focal length of the virtual image imaging component to adjust an imaging position of the virtual image on retinas of human eyes.

Description

Adjustable focus virtual reality glasses

The invention relates to virtual reality glasses, in particular to virtual reality glasses with adjustable focus.

Due to the excessive time of watching TV, surfing the Internet or playing games, the phenomenon of myopia in childhood is becoming more and more serious. When most parents encounter myopia in their children, they often wear myopia glasses for their children to avoid deterioration of vision. However, this leads to permanent myopia for children, and it is very inconvenient to wear glasses for the rest of their lives. In fact, most children and other pseudo-myopia can recover their vision through vision correction. The main principle is to observe through the eyes through tiny eyesight. , Presbyopia can improve presbyopia by staring at the near for a long time. However, most people, especially children, are also affected by factors such as the external environment, and it is difficult to concentrate enough to stare at the same place for a long time.

The technical problem to be solved by the present invention is to provide a virtual reality glasses with adjustable focus, which includes a virtual reality glasses body, a virtual image imaging element and a focus adjuster. The virtual reality glasses body has a display screen and a frame supporting the display screen. The virtual image imaging element is arranged on the mirror frame. The virtual image imaging component is configured to output a virtual image to be displayed on the display screen, and the virtual image and the real image in reality overlap or do not overlap each other. The focus adjuster is arranged on the mirror frame. The focal length adjuster is configured to adjust the focal length of the virtual image imaging element according to a focal length adjustment requirement, so as to adjust the distance between the virtual image formed on the retina of the human eye when the light emitted by the display screen or the light from the external environment is refracted to the pupil of the human eye imaging position.

In one embodiment, the focal length adjuster determines the adjusted focal length of the virtual image imaging element according to the visual state information of the human eye.

In one embodiment, the display screen has two adjacent lenses. The virtual image imaging component displays the virtual image on one of the two lenses, or divides the same virtual image into two consecutive sub-virtual images and displays them on the two lenses respectively, or displays the virtual image contained in the virtual image. Two sub-virtual images discontinuous with each other are displayed on the two lenses respectively. The focal length adjuster adjusts the focal length of the imaging element of the virtual image, so as to adjust the imaging position of one or both of the two sub-virtual images.

In one embodiment, the adjustable-focus virtual reality glasses further include a heart rate detector and a vision evaluation device. The heart rate detector is connected to the focus adjuster. The heart rate detector is configured to use the focus adjuster to adjust the focus before and after, and detect the heart rate variation value of the user who wears the virtual reality glasses and looks at the virtual image. The vision assessment device is connected to a heart rate detector and a focus adjuster. The eyesight evaluation device is configured to determine whether the human eyes feel uncomfortable viewing the virtual image at the currently adjusted focal length according to the heart rate variation value.

In one embodiment, the heart rate detector detects the heart rate variation values of the user as the first heart rate variation value and the second heart rate variation value respectively before and after the focus adjuster adjusts the focus. The vision evaluation device calculates the difference between the first heart rate variation value and the second heart rate variation value. When the vision assessment device judges that the difference is greater than the heart rate variation threshold, it determines that the user cannot see clearly and the heart rate variation is too large, and instructs the focus adjuster to temporarily stop adjusting the focus, reduce the frequency of focus adjustment, or reduce the current focus.

In one embodiment, after the focal length adjuster is adjusted from one of the multiple set focal lengths to another, the visual acuity evaluation device determines that the detected heart rate variation value maintains a fixed value or the variation amount of the heart rate variation value is not greater than the heart rate When a time length of the variation threshold is greater than a time threshold, instruct the focus adjuster to adjust to the next set focus.

In one embodiment, the plurality of set focal lengths of the focus adjuster include a plurality of far set focal lengths within a range of far focal lengths, and the visual acuity evaluation device judges that the user is nearsighted according to a visual state information of the user, and indicates The focal length adjuster adjusts the focal length of the virtual image imaging element to one of the distant set focal lengths.

In one embodiment, the focus adjuster sorts the multiple distant focal lengths within the range of distant focal lengths according to the detected heart rate variation value of the user, and adjusts to each distant focal length progressively and sequentially.

In one embodiment, the multiple set focal lengths of the focus adjuster include multiple near set focal lengths within a range of near focal lengths, and the eyesight assessment device judges the user's presbyopia or hyperopia based on a piece of visual state information of the user When , instruct the focal length adjuster to adjust the focal length of the virtual image imaging element to one of the near setting focal lengths.

In one embodiment, the focus adjuster sorts the multiple near focal lengths within the near focal length range according to the detected heart rate variation value of the user, and gradually adjusts to each near focal length sequentially.

As mentioned above, the present invention provides a kind of virtual reality glasses with adjustable focal length, which can be adjusted between multiple set focal lengths to adjust the imaging position of the three-dimensional virtual reality image in the retina of the human eye, and guide the visual acuity The best users (such as myopia or presbyopia) look at the designated position for a long time, so as to prevent the deterioration of the user's eyesight and correct the vision.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings related to the present invention. However, the provided drawings are only for reference and description, and are not intended to limit the present invention.

The implementation of the present invention is described below through specific specific examples, and those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only for simple illustration, and are not drawn according to the actual size, which is stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention. In addition, the term "or" used herein may include any one or a combination of more of the associated listed items depending on the actual situation.

[first embodiment]

Please refer to Fig. 1 and Fig. 2, wherein Fig. 1 is a schematic diagram of the appearance of the virtual reality glasses with adjustable focus according to the first embodiment of the present invention; Fig. 2 is a schematic view of the virtual reality glasses with adjustable focal length according to the first embodiment of the present invention Use the schematic.

The adjustable focus virtual reality glasses 1000 of this embodiment may include a virtual reality glasses body 10 , a virtual image imaging device 20 and a focus adjuster 30 . The virtual reality glasses body 10 can be VR virtual reality glasses, AR augmented reality glasses or other devices that allow users to see virtual images when wearing them. The virtual reality glasses body 10 can have a display screen 11 and a frame 12 .

The virtual image imaging device 20 and the focus adjuster 30 can be disposed on the frame 12 of the virtual reality glasses body 10 . The virtual image imaging component 20 can output the virtual image 21 to the display screen 11 to display the virtual image 21 on the display screen 11 .

The focus adjuster 30 can be a zoom lens module, which is only used as an example, and the present invention is not limited thereto. The focal length adjuster 30 can adjust the focal length of the virtual image imaging element 20 to adjust the imaging position of the virtual image 21 formed on the retina of the human eye when the light emitted by the display screen 11 or the light of the external environment is refracted to the pupil of the human eye.

Please refer to Fig. 1 to Fig. 6 together, wherein Fig. 3 is a schematic diagram of the use of the virtual reality glasses with adjustable focal length set to the first focal length according to the first embodiment of the present invention; Fig. 4 is the adjustable focal length of the first embodiment of the present invention A schematic diagram of using the virtual reality glasses with the focal length set to the second focal length; FIG. 5 is a schematic diagram of the use of the virtual reality glasses with adjustable focal length set to the third focal length according to the first embodiment of the present invention; FIG. 6 is a schematic diagram of the first embodiment of the present invention Block diagram of an example of adjustable focus virtual reality glasses.

The virtual image imaging component 20 can provide the same default virtual image 21 fixedly, or determine the content of the virtual image 21 provided to the user 90 according to the user 90's vision status information 99 , personal interest data, and the like. For example, the virtual image imaging device 20 selects one of a plurality of pre-stored preset virtual images for the user 90 to watch. For another example, the virtual reality glasses 1000 may further include an image capture component such as a camera, and the virtual image imaging component 20 generates a corresponding virtual image 21 for the user 90 to watch according to the image captured by the image capture component.

The virtual images described in this article are all examples of three-dimensional virtual reality images, especially the images with a sense of extension as shown in FIGS. However, the present invention is not limited thereto.

The focal length adjuster 30 can provide multiple set focal lengths. The plurality of set focal lengths includes a plurality of far set focal lengths within a far focal length range, a plurality of near set focal lengths within a near focal length range, and a plurality of normal vision settings within a normal vision focal length range focal length, or any combination thereof.

The virtual reality glasses 1000 may further include a vision evaluation device 50 . The vision assessment device 50 can obtain the vision state information 99 of the user 90 from the outside (the electronic device 91 ). When the vision assessment device 50 judges that the user 90 is nearsighted according to the vision state information 99 of the user 90 , the vision assessment device 50 instructs the focus adjuster 30 to adjust the focus of the virtual image imaging device 20 to one of the distant set focus distances. The distant set focal length may be the far set focal length with the smallest difference between the multiple far set focal lengths and the currently adjusted normal vision set focal length. In this way, it is possible to prevent the focal length from being suddenly adjusted too much, causing maladaptation to the human eye.

The focus adjuster 30 can use a set frequency or a non-fixed frequency to gradually adjust to each distant set focus within the range of the far focus along with the order of the multiple set focus distances. For myopia, as shown in Figure 3 to Figure 5, the focal length can be adjusted from small to large, and gradually guide the myopia to look farther and farther, and correct (false) myopia by allowing the myopia to look far away for a long time eyesight of the patient.

Conversely, when the vision assessment device 50 judges that the user 90 is presbyopic according to the vision state information 99 of the presbyopia, the vision assessment device 50 instructs the focus adjuster 30 to adjust the focus of the virtual image imaging device 20 to one of the near settings focal length. The near setting focal length may be the near setting focal length with the smallest difference between the multiple near setting focal lengths and the currently adjusted normal vision setting focal length. In this way, it is possible to prevent the focal length from being suddenly adjusted too much, causing maladaptation to the human eye.

The focus adjuster 30 can use a set frequency or a non-fixed frequency to sort according to the size of multiple near set focal lengths within the near focal length range, and gradually adjust to each near set focal length in sequence. For presbyopia patients, the focal length can be adjusted from large to small as shown in Fig. 5 to Fig. 3, and gradually guide the user 90 to look closer. The vision of the flower.

If necessary, the virtual reality glasses 1000 of this embodiment may further include a heart rate detector 40 , such as a smart heart rate bracelet, which is only an example here, and the present invention is not limited thereto.

The heart rate detector 40 can be wired or wirelessly connected to the focus adjuster 30 . The heart rate detector 40 can detect the heart rate variability value 41 or heart rate variability ( heart rate variability). A variety of parameters commonly used in heart rate variability analysis, including the square root of the mean of the sum of the squares of differences between adjacent NN intervals (The square root of the mean of the sum of the squares of differences between adjacent NN intervals) used in the embodiments of the text, as An indicator of short-range heart rhythm variability.

The vision assessment device 50 can be connected to the heart rate detector 40 and the focus adjuster 30 . When the user 90 cannot see the virtual image 21 clearly due to poor eyesight, he may feel flustered or irritable, resulting in unstable heart rate (the heart rate variation value is too large), and the variation is large. On the contrary, when the user 90 can see the virtual image 21 clearly, the heart rate will be stable.

When the visual acuity evaluation device 50 judges that the detected heart rate variation value 41 falls into the abnormal value range or increases to be greater than the heart rate variation threshold value, adjust the focal length of the virtual image imaging element 20, for example, for myopia, reduce the focal length, otherwise, For hyperopia or presbyopia, increase the focal length. Until the user 90 can see the virtual image 21 clearly, the heart rate is stable, and the heart rate variation value 41 falls within the normal range.

Therefore, when the focal length adjuster 30 adjusts the focal length of the virtual image imaging device 20 between multiple set focal lengths, the heart rate detector 40 can detect the heart rate variation 41 of the user 90 at different focal lengths. The vision assessment device 50 can record the heart rate variability 41 of the user 90 under different focal length values 31 as preliminary reference data for the vision state information 99 of the user 90 .

The vision status information 99 of the user 90 can be estimated by the vision assessment device 50 based on the heart rate variation value 41 of the user 90 and the focal length value 31 of the virtual reality glasses 1000 as described above, and can also be detected by the user 90 through detection methods such as a hospital. Obtained, the user 90 or others can transmit the detected vision state information 99 to the focus adjuster 30 through an electronic device 91 such as a mobile phone or a computer, so as to instruct the focus adjuster 30 to adjust the virtual image according to the vision state information 99 of the user 90 The focal length of element 20.

For myopia, the focal length adjuster 30 can be adjusted to each distant focal length progressively and sequentially according to the heart rate variation value 41 of the user 90 , and according to the ordering of multiple distant focal lengths. For people with presbyopia or hyperopia, the focal length adjuster 30 can be based on the heart rate variation value 41 of the user 90, sort according to the size of multiple near focal lengths in the near focal length range, and gradually adjust to each near Set the focal length.

[Second embodiment]

Please refer to FIG. 7 and FIG. 8, wherein FIG. 7 is a schematic diagram of the use of the virtual reality glasses with adjustable focus according to the second embodiment of the present invention; FIG. 8 is a schematic diagram of the virtual reality glasses with adjustable focus according to the second embodiment of the present invention block diagram. The same content as the first embodiment will not be repeated here.

In the first embodiment, for example, the display screen 11 of the virtual reality glasses body 10 has only a single lens. In this embodiment, for example, the display screen 110 of the virtual reality glasses body 100 has double lenses, such as a first lens 111 and a second lens 112 adjacent to each other as shown in FIG. 7 . If the aforementioned virtual reality glasses body 10 is replaced by the virtual reality glasses body 100 of this embodiment, the virtual image 21 generated by the virtual image imaging element 200 can be displayed on the first lens of the display screen 110 of the virtual reality glasses body 100 111 and the second lens 112, or both display the same virtual image 21.

In this embodiment, the virtual image imaging device 200 can divide the same virtual image into continuous first sub-virtual images 211 and second sub-virtual images 212 to be displayed on the first mirror 111 and the second mirror 112 respectively. Alternatively, the virtual image imaging device 200 can display two discontinuous first sub-virtual images 211 and second sub-virtual images 212 on the first mirror 111 and the second mirror 112 respectively.

For example, the virtual image imaging element 200 may include a first imaging element 201 and a second imaging element 202 for outputting a first sub-virtual image 211 and a second sub-virtual image 212 respectively. In practice, multiple sub-virtual images can also be generated by a single imaging element.

Depending on factors such as the user 90's location, orientation, and head tilt angle, the first sub-virtual image 211 and/or the second sub-virtual image 211 and/or the second sub-virtual image that the user 90 sees through the display screen 110 of the virtual reality glasses body 100 The image 212 may or may not overlap with the real image in reality.

The focal length adjuster 30 can adjust the focal length of the virtual image imaging element 200 to adjust the imaging position of the first sub-virtual image 211 on the first lens 111, and/or adjust the imaging of the second sub-virtual image 212 on the second lens 112. Location.

When the user 90 cannot see the virtual image clearly due to poor eyesight, he may feel flustered or irritable, resulting in unstable heart rate (increased heart rate variation can be detected), and the variation of the heart rate of the user 90 is large. On the contrary, when the user 90 can see the virtual image clearly, the heart rate is stable, and the variation range of the user 90's heart rate is small.

Therefore, before the focus adjuster 30 adjusts the focus of the virtual image imaging device 200 , the heart rate detector 40 detects the heart rate variation value of the user 90 as the first heart rate variation value 411 . After the focus adjuster 30 adjusts the focus of the virtual image imaging device 200 , the heart rate detector 40 detects the heart rate variation value of the user 90 as the second heart rate variation value 412 .

The vision assessment device 50 can calculate the difference 51 between the first HRV value 411 and the second HRV value 412 . When the vision evaluation device 50 judges that the difference 51 is greater than the heart rate variation threshold value 52, it is determined that the user 90 cannot see clearly and the heart rate is unstable, and instructs the focus adjuster 30 to temporarily stop adjusting the focus, reduce the frequency of focus adjustment, or reduce the focus to avoid Causes a burden on the eyes or mind of the user 90 .

After the focal length adjuster 30 adjusts from one of the multiple set focal lengths to another set focal length, the visual acuity assessment device 50 judges the detected first heart rate variation value 411 or the second heart rate variation value 412 and maintains a fixed value. Or when the amount of variation is not greater than the time length of the heart rate variation threshold value 52 is greater than the time threshold value, instruct the focus adjuster 30 to adjust to the next larger (for myopia) or smaller (for presbyopia) setting focal length.

In this embodiment, since the display screen 110 of the virtual reality glasses body 100 has a first lens 111 and a second lens 112 aimed at the left eye and the right eye of the user 90 respectively. Therefore, in addition to simultaneously displaying the same or different virtual images such as the first sub-virtual image 211 and the second sub-virtual image 212 on the first lens 111 and the second lens 112 of the display screen 110 of the virtual reality glasses body 100 as described above , the virtual images can also be displayed in different time intervals to detect the heart rate variation values of the left eye of the user 90 and the heart rate variation when watching the virtual images at different focal lengths, so as to know that the right and left eyes of the user 90 are at Comfort at different focal lengths.

To sum up, the present invention provides a virtual reality glasses with adjustable focal length, which can be adjusted among multiple set focal lengths, so as to adjust the imaging position of the three-dimensional virtual reality image on the retina of the user and guide the visual acuity Users with poor performance (such as myopia or presbyopia) stare at a designated location for a long time, so as to correct the user's vision.

The content disclosed above is only a preferred feasible embodiment of the present invention, and does not therefore limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made by using the description and drawings of the present invention are included in the application of the present invention. within the scope of the patent.

1000: virtual reality glasses 10, 100: Virtual reality glasses body 11, 110: display screen 12, 120: mirror frame 20, 200: virtual imaging components 21:Virtual image 30: Focus adjuster 31: focal length value 40:Heart rate detector 41: Heart Rate Variability 50: Vision assessment device 90: user 91: Electronic device 99: Vision status information 111: first lens 112: second lens 211: The first sub-virtual image 212: Second sub-virtual image 201: The first imaging element 202: the second imaging element 411: The first heart rate variation value 412: The second heart rate variation value 51: difference 52: HRV Threshold

FIG. 1 is a schematic diagram of the appearance of virtual reality glasses with adjustable focus according to the first embodiment of the present invention.

FIG. 2 is a schematic diagram of using the virtual reality glasses with adjustable focus according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram of the use of the virtual reality glasses with adjustable focus distance set to a first focus distance according to the first embodiment of the present invention.

FIG. 4 is a schematic diagram showing the use of the virtual reality glasses with adjustable focus distance set to a second focus distance according to the first embodiment of the present invention.

FIG. 5 is a schematic diagram showing the use of the virtual reality glasses with adjustable focus distance set to a third focal length according to the first embodiment of the present invention.

FIG. 6 is a block diagram of the virtual reality glasses with adjustable focus according to the first embodiment of the present invention.

FIG. 7 is a schematic diagram of using the virtual reality glasses with adjustable focus according to the second embodiment of the present invention.

FIG. 8 is a block diagram of virtual reality glasses with adjustable focus according to a second embodiment of the present invention.

10: Virtual reality glasses body

11: display screen

12: frame

20:Virtual image imaging components

21:Virtual image

30: Focus adjuster

31: focal length value

40:Heart rate detector

41: Heart Rate Variability

50: Vision assessment device

90: user

91: Electronic device

99: Vision status information

Claims (10)

A virtual reality glasses with adjustable focus, comprising: A virtual reality glasses body has a display screen and a frame supporting the display screen; A virtual image imaging element is arranged on the frame and is configured to output a virtual image to be displayed on the display screen, and the virtual image overlaps or does not overlap with the real image in reality; and A focal length adjuster, located on the frame, configured to adjust a focal length of the virtual image imaging element according to a focal length adjustment requirement, so as to adjust the refraction of the light emitted by the display screen or the light of the external environment to the human eye When the pupil is opened, the virtual image is imaged at an imaging position on the retina of the human eye. The virtual reality glasses with adjustable focus as described in Claim 1, wherein the focus adjuster determines the size of the focus adjusted by the virtual image imaging element according to a visual state information of the human eye. The virtual reality glasses with adjustable focus as described in claim 1, wherein the display screen has two adjacent lenses, and the virtual image imaging element displays the virtual image on one of the two lenses, or Either divide the same virtual image into two continuous sub-virtual images and display them on the two lenses respectively, or display two discontinuous sub-virtual images contained in the virtual image on the two lenses respectively , the focus adjuster adjusts the focal length of the virtual image imaging element, so as to adjust the imaging position of one or both of the two sub-virtual images. The virtual reality glasses with adjustable focus as described in claim 1, further comprising: A heart rate detector, connected to the focus adjuster, configured to detect a heart rate variation value of a user wearing the virtual reality glasses body looking at the virtual image before and after the focus adjuster adjusts the focus; and A vision evaluation device is connected with the heart rate detector and the focus adjuster, and is configured to determine whether the human eyes feel uncomfortable watching the virtual image at the currently adjusted focus according to the heart rate variation value. The virtual reality glasses with adjustable focus as described in claim 4, wherein the heart rate detector respectively detects the heart rate variation value of the user before and after the focus adjuster adjusts the focus as a first heart rate variation value and A second heart rate variation value, the vision assessment device calculates a difference between the first heart rate variation value and the second heart rate variation value, and determines that the user cannot see clearly when the difference is greater than a heart rate variation threshold value If the heart rate is unstable, the focus adjuster is instructed to temporarily stop adjusting the focus, reduce the frequency of focus adjustment, or reduce the current focus. The virtual reality glasses with adjustable focus as described in claim 4, wherein after the focus adjuster is adjusted from one of the plurality of set focus distances to another, the vision evaluation device judges the detected heart rate When the variation value maintains a fixed value or the variation amount of the heart rate variation value is not greater than a time length of the heart rate variation threshold value and is greater than a time threshold value, instruct the focus adjuster to adjust to the next set focus distance. The virtual reality glasses with adjustable focus as described in claim 4, wherein the plurality of set focal lengths of the focus adjuster include a plurality of far set focal lengths within a range of far focal lengths, and the vision evaluation device is used according to The visual status information of the user is used to instruct the focus adjuster to adjust the focal length of the virtual image imaging element to one of the distant set focal lengths when it is judged that the user is nearsighted. The virtual reality glasses with adjustable focus as described in claim 7, wherein the focus adjuster sets the size of the focal length according to the multiple distances in the distant focal length range according to the detected heart rate variation value of the user Sorting, and gradually adjusting to each distance to set the focal length. The virtual reality glasses with adjustable focus as described in claim 4, wherein the plurality of set focal lengths of the focus adjuster include a plurality of near set focal lengths within a near focal length range, and the vision evaluation device is used according to The visual status information of the user is used to instruct the focus adjuster to adjust the focal length of the virtual image imaging element to one of the near setting focal lengths when it is judged that the user is presbyopic or farsighted. The virtual reality glasses with adjustable focus as described in Claim 9, wherein the focus adjuster sets the size of the focus according to the multiple near distances in the near focal distance range according to the detected heart rate variation value of the user Sorting, gradually adjusting to each near setting focal length in sequence.

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