TW202111387A - Head-mounted display apparatus and visual inspection method thereof - Google Patents

Abstract

A head-mounted display apparatus and visual inspection method are provided. The head-mounted display apparatus is adapted to be disposed in front of eyes of a user and includes at least one display, at least on lens, a storage circuit and a processor. The display provides image light and the lens is disposed on the transmission path of the image light to transmit the image light to one eye. The storage circuit records a plurality of instructions. The processor is coupled to the display and the storage circuit and configured to execute the instructions to perform the following steps. A visual inspection pattern is displayed by controlling the display, such that a visual image including the visual inspection pattern is provided by the lens. A user response corresponding to the visual inspection pattern is received. A visual condition of the user is determined according to the user response.

Description

Head-mounted display device and its vision inspection method

The present invention relates to an electronic device, and more particularly to a head-mounted display device and its vision inspection method.

With the progress of display technology and people's desire for high technology, the technology of virtual reality (virtual reality) has gradually matured, and head mounted display (HMD) is the display used to realize this technology. In recent years, as the resolution of micro-displays has become higher and the size and power consumption have become smaller and smaller, the head-mounted display has also developed into a portable display device. Generally speaking, head-mounted displays usually use Near Eye Display (NED) to display images. In order to produce a head-mounted display device with a larger field of view, the design of the optical system of the head-mounted display device (such as lens type, lens size or lens position, etc.) and the configuration of the display screen are all considered by developers The key point, which can directly affect the experience of the visual sense organs.

However, the vision status of different users is different. Specifically, some people suffer from myopia, some people suffer from presbyopia, and some people suffer from astigmatism. Even some people suffer from color blindness. Moreover, even if the same person suffers from myopia, everyone's degree of myopia is not the same. In other words, the conditions under which everyone can see clearly through their eyes are different, and even have great differences. Therefore, if the head-mounted display device uses a fixed configuration to provide images to users with different vision status, the viewing experience of these users will be quite different due to their personal vision status.

In view of this, the present invention provides a head-mounted display device and its vision detection method, which allows users to perform vision detection through a head-mounted display device that provides virtual reality, and adjust the head-mounted display device according to the personalized vision state. The display settings of the display device.

The invention provides a head-mounted display device, which is suitable for being arranged in front of a user's eyes, and includes at least one display screen, at least one lens, a storage circuit, and a processor. The display screen provides an image light beam, and the lens is arranged on the transmission path of the image light beam to transmit the image light beam to the eyes. The storage circuit stores a plurality of instructions. The processor is coupled to the storage circuit and the display screen, and is configured to execute the instructions to control the display screen to display a visual inspection pattern so that the lens provides a virtual image including the visual inspection pattern. Receive a user response corresponding to the vision check pattern. Judge the user's vision status based on the user's response.

The invention provides a vision detection method, which is suitable for a head-mounted display device. The head-mounted display device is suitable for being placed in front of the user's eyes, and the method includes the following steps. The at least one display screen of the head-mounted display device is controlled to display the visual inspection pattern so that the at least one lens of the head-mounted display device provides a virtual image including the visual inspection pattern. Receive a user response corresponding to the vision check pattern. Judge the user's vision status based on the user's response.

Based on the above, in the embodiment of the present invention, the head-mounted display device can display the vision inspection pattern according to the user's control, so that the user can perform the vision inspection. In addition, based on the user response issued by the user, the head-mounted display device can confirm the user's vision status according to the display content or display mode of the vision check pattern related to the user's response.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

Part of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The component symbols used in the following description will be regarded as the same or similar components when the same component symbols appear in different drawings. These embodiments are only a part of the present invention, and do not disclose all the possible implementation modes of the present invention. More precisely, these embodiments are only examples of methods and devices within the scope of the patent application of the present invention.

FIG. 1A is a block diagram of a head-mounted display device according to an embodiment of the present invention. FIG. 1B is a schematic diagram of a head-mounted display device according to an embodiment of the present invention. Referring to FIGS. 1A and 1B at the same time, the head-mounted display device 10 is suitable for being worn on the head of a user and can display images for the user to view, and it includes a wearing part W1 and a main body B1. In this embodiment, the main body B1 is composed of a shell covering various elements. The above-mentioned components may include a lens 110, a display screen 120, a processor 130, a driving mechanism 140, a storage circuit 150, a display screen 160, and a lens 170.

The display screens 120 and 160 are respectively used to provide image light beams including image content to the left and right eyes of the user, such as liquid crystal displays (LCD) and light-emitting diode (LED) displays Or other types of displays, the present invention is not limited to this.

The lenses 110 and 170 respectively correspond to the left eye and the right eye of the user, and are respectively arranged on the transmission path of the image light beam to respectively transmit the image light beam to the left eye and the right eye of the user. The lenses 110 and 170 may be composed of one or more lenses, respectively, which is not limited in the present invention. Specifically, the user's left eye can view the display screen 120 through the lens 110, and the user's right eye can view the display screen 160 through the lens 170. Through the refraction of the lenses 110 and 170, the user can view the virtual image of the screen provided by the display screens 120 and 160 based on the close distance. The lenses 110 and 170 are, for example, Fresnel lenses or other types of lenses, and the present invention is not limited thereto.

The lenses 110 and 170 are connected to a driving mechanism 140, and the driving mechanism 140 can be used to adjust the positions of the lenses 110 and 170. Alternatively, the driving mechanism 140 can also be used to adjust the positions of the display screens 120 and 160. For example, the driving mechanism 140 may include a stepping motor to push the lenses 110 and 170 away from or close to the display screens 120 and 160. Alternatively, the driving mechanism 140 can push the display screens 120 and 160 in a direction away from or close to the eyes of the user.

The storage circuit 150 is, for example, any type of fixed or removable random access memory (Random Access Memory, RAM), read-only memory (Read-Only Memory, ROM), flash memory (Flash memory) or others. Similar devices or a combination of these devices are used to record multiple instructions that can be executed by the processor 130, and these instructions can be loaded into the processor 130.

The processor 130 is, for example, a central processing unit (Central Processing Unit, CPU), or other programmable general-purpose or special-purpose microprocessor (Microprocessor), digital signal processor (Digital Signal Processor, DSP), programmable Controllers, Application Specific Integrated Circuits (ASIC), Programmable Logic Device (PLD) or other similar devices or a combination of these devices. The processor 130 is coupled to the display screen 120, the display screen 160, the driving mechanism 140, and the storage circuit 150, and can access and execute the instructions recorded in the storage circuit 150 to implement the vision detection method of the embodiment of the present invention. In addition, the processor 130 can drive the display screens 120 and 160 so that the display screens 120 and 160 display images to the user.

It should be understood that the head-mounted display device 10 shown in FIG. 1B is only an example of implementation, which is not restrictive, but merely illustrative. According to design requirements, the head-mounted display device including the components shown in FIG. 1A can be embodied in other structural forms different from the example of FIG. 1B.

However, it should be noted that, in order to clearly explain the vision detection method of the embodiment of the present invention, the subsequent embodiments will take the display screen 120 and the lens 110 that provide images to a single eye as an example for description. Those with ordinary knowledge can understand the same. The process can also be applied to the display screen 160 and the lens 170 that provide images to the other eye.

FIG. 2 is a method flowchart of the vision detection method according to an embodiment of the present invention. Please refer to FIG. 2, the method of this embodiment is applicable to the head-mounted display device 10 in the above-mentioned embodiment. The detailed steps of this embodiment are described below with various components in the head-mounted display device 10.

It should be noted that while the processor 130 controls the display screen 120 to display the vision check pattern, the processor 130 controls the display screen 160 to display a black screen to measure one of the eyes. On the contrary, while the processor 130 controls the display screen 160 to display the vision check pattern, the processor 130 controls the display screen 120 to display a black screen to measure the other of the eyes.

First, in step S201, the processor 130 controls the at least one display screen 120 to display a vision check pattern so that the at least one lens 110 provides a virtual image including the vision check pattern. The visual inspection pattern can present different pattern contents according to the inspection items. Generally speaking, the vision test pattern may include letters, numbers, geometric symbols, or designed test patterns, and so on. When the visual inspection pattern is displayed on the display screen 120, the user can control the display mode of the visual inspection pattern or the content of the pattern through voice input or manipulation of a wand. In addition, the head-mounted display device 10 is based on the principle of virtual image imaging to allow the user's eyes to see a virtual image including a visual inspection pattern. The virtual image distance between the virtual image and the eye depends on the physical focal length of the lens 110 and the distance between the display screen 120 and the lens 110. In an application example, taking the lens 110 with a lens focal length of 9mm as an example, if the distance between the display screen 120 and the lens 110 is 36mm, the virtual image distance is 0.5m; if the distance between the display screen 120 and the lens 110 If it is 34mm, the virtual image distance is 0.333m.

Next, in step S202, the processor 130 receives a user response corresponding to the vision check pattern. In step S203, the processor 130 determines the user's vision state based on the user's response. In view of the above, when the visual inspection pattern is displayed on the display screen 120, the user can control the configuration state of the display screen 120 and/or the lens system through voice input or the manipulation of the control stick, thereby further controlling the display mode of the visual inspection pattern or the content of the pattern. . Therefore, in response to the processor 130 detecting the user's response, the processor 130 will determine the current configuration state of the display screen 120 and/or the lens 110, and thereby determine the user's vision state according to the above current configuration state. The aforementioned visual state may be the degree of myopia, the degree of presbyopia, the axial degree of astigmatism, the degree of astigmatism, the resolution of vision, or whether they suffer from color blindness, etc. However, for different vision detection items, the control method of the display screen 120 and/or the lens 110 is also different, and the following examples will be listed to explain more clearly.

FIG. 3 is a flowchart of a vision detection method according to an embodiment of the present invention. Please refer to FIG. 3, the method of this embodiment is applicable to the head-mounted display device 10 in the above-mentioned embodiment. The detailed steps of this embodiment are described below with various components in the head-mounted display device 10.

In step S301, the processor 130 drives the display screen 120 to display a graphical interface including a vision detection pattern. In step S302, the processor 130 detects the user's control command. The above-mentioned user's control command is, for example, the user clicks on the arrow pattern in the graphical interface through the control stick. In step S303, the processor 130 controls the driving mechanism 140 to adjust the distance between the at least one display screen 120 and the at least one lens 110 according to the control command issued by the user, so that the virtual image distance between the virtual image and the eye is within a preset interval change. At the same time, the processor 130 detects the user's user response. In detail, the processor 130 can adjust the distance between the display screens 120 and 110 by pushing the display screen 120 or the lens 110. In response to the change in the distance between the screens 120 and 110, the virtual image distance between the virtual image and the eyes also changes correspondingly.

After that, in step S304, the processor 130 obtains the selected virtual image distance in the preset interval in response to receiving the user response. In step S305, the processor 130 determines the refractive power of the eye according to the selected virtual image distance. In view of the above, since the virtual image distance between the virtual image and the eyes can be increased or decreased based on the user's control commands, users suffering from myopia or presbyopia will feel that the clarity of the virtual image including the vision detection pattern will also correspond to the virtual image distance It's different. Therefore, in this embodiment, when the distance between the display screens 120 and 110 is changed, once the user feels that the vision detection pattern can be clearly seen, the user can send a user response through the control stick. The above-mentioned user response may be that the user presses a button on the control stick or the user clicks a specific icon on the graphical interface through the control stick. In response to the user's response, the processor 130 may obtain the selected virtual image distance at which the user can clearly see the vision detection pattern. Based on this, the processor 130 can determine the diopter of the eye according to the selected virtual image distance selected by the user in response. The above-mentioned refractive power may be myopia power or presbyopia power.

In an embodiment of the present invention, when detecting the degree of myopia, the processor 130 controls the driving mechanism 140 to gradually increase the distance between the display screen 120 and the lens 110, so that the virtual image distance between the virtual image and the eye is at a preset value. The interval gradually increases within the first preset interval. The aforementioned first predetermined interval is, for example, 0.25 meters to 5 meters. Then, the processor 130 obtains the first selected virtual image distance among the selected virtual image distances in response to receiving the user's response, and determines the myopia degree of the eye according to the first selected virtual image distance.

For example, FIGS. 4A and 4B are schematic diagrams of detecting myopia according to an embodiment of the present invention. 4A and 4B, the processor 130 can drive the display screen 120 to display the graphic interface 41. The graphical interface 41 includes a vision detection pattern 40, and the vision detection pattern 40 is illustrated as a capital English letter "E" here. In addition, the graphical interface 41 further includes arrow icons (icons) 42 and 43 and a nearsightedness display icon (icon) 44. The user can move the cursor to the arrow icon 42 or the arrow icon 43 by controlling the stick to give control commands. The processor 130 will control the driving mechanism 140 to gradually increase the distance between the display screen 120 and the lens 110 according to the above-mentioned control command.

In the example of FIG. 4B, the driving mechanism 140 pushes the lens 110 to move closer to the eye E1, so that the distance between the display screen 120 and the lens 110 gradually increases from the distance G1. Correspondingly, the virtual image distance between the eye E1 and the virtual image V1 will gradually increase from the distance Vd1. For myopia patients, the virtual image V1 is getting farther and farther from the eye E1, so the user may find that the vision detection pattern 40 can no longer be clearly seen. In this exemplary embodiment, when the distance between the display screen 120 and the lens 110 is the distance G2, the user can clearly see the vision detection pattern 40. However, when the distance between the display screen 120 and the lens 110 is greater than the distance G2, the user will not be able to see the vision detection pattern 40 clearly. In other words, the distance G2 is the farthest distance that the user's eyes can see clearly. Therefore, when the distance between the display screen 120 and the lens 110 is the distance G2 and the virtual image distance between the eye E1 and the virtual image V1 is the distance Vd2, the user can click the myopia display icon 44 by controlling the stick to provide the user with Response.

Accordingly, the processor 130 may obtain the selected virtual image distance (ie, the first selected virtual image distance) between the eye E1 and the virtual image V1 as the distance Vd2 in response to receiving the user clicking the myopia display icon 44. The processor 130 can then determine the degree of myopia of the eye E1 according to the distance Vd2. As far as general myopia detection standards are concerned, the degree of myopia is approximately equal to the reciprocal of the farthest distance that can be seen clearly multiplied by 100. For example, when the maximum distance that the eyes can see clearly is 0.5 meters, it means that the eyes are nearsighted by 200 degrees. When the farthest distance that the eyes can see clearly is 0.25 meters, it means that the eyes are nearsighted 400 degrees. In the embodiment of the present invention, the storage circuit 150 may store a look-up table established according to the above-mentioned myopia detection criteria, so the processor 130 may search the above-mentioned look-up table according to the selected virtual image distance corresponding to the user's response to obtain the user The degree of myopia. Table 1 is an example of a lookup table, but it is not used to limit the present invention. Table 1 Myopia Selected virtual image distance 100 1.00m 200 0.50m 400 0.25m 500 0.20m

On the other hand, in an embodiment of the present invention, when detecting the degree of presbyopia, the processor 130 controls the driving mechanism 140 to gradually reduce the distance between the display screen 120 and the lens 110, so that the gap between the virtual image and the eye The virtual image distance gradually decreases in the second preset interval in the preset interval. The aforementioned first predetermined interval is, for example, 1 meter to 0.1 meter. Then, the processor 130 obtains the second selected virtual image distance among the selected virtual image distances in response to receiving the user's response, and determines the presbyopia degree of the eye according to the second selected virtual image distance.

For example, FIGS. 5A and 5B are schematic diagrams of detecting presbyopia according to an embodiment of the present invention. Referring to FIGS. 5A and 5B, the processor 130 can drive the display screen 120 to display the graphic interface 51. The graphical interface 51 includes a vision detection pattern 50, and the vision detection pattern 50 is exemplified here as a capital English letter "E". In addition, the graphic interface 51 further includes arrow icons (icons) 52 and 53 and a presbyopia degree display icon (icon) 54. The user can move the cursor to the arrow icon 52 or the arrow icon 53 by controlling the stick to give a control command. The processor 130 will control the driving mechanism 140 to gradually reduce the distance between the display screen 120 and the lens 110 according to the above-mentioned control command.

In the example of FIG. 5B, the driving mechanism 140 pushes the lens 110 to move away from the eye E2, so that the distance between the display screen 120 and the lens 110 gradually decreases from the distance G3. Correspondingly, the virtual image distance between the eye E2 and the virtual image V2 will gradually decrease from the distance Vd3. For the presbyopic patient, the virtual image V2 is getting closer and closer to the eye E2, so the user may find that the vision test pattern 50 can no longer be clearly seen. In this exemplary embodiment, when the distance between the display screen 120 and the lens 110 is the distance G4, the user can clearly see the vision detection pattern 50. In a television, when the distance between the display screen 120 and the lens 110 is less than the distance G4, the user will no longer be able to clearly see the vision detection pattern 50 clearly. In other words, the distance G4 is the closest distance that the user can see clearly. Therefore, when the distance between the display screen 120 and the lens 110 is the distance G4 and the virtual image distance between the eye E2 and the virtual image V2 is the distance Vd4, the user will click on the presbyopic power display icon 44 by controlling the walking stick to provide use The person responded.

Accordingly, the processor 130 may obtain the selected virtual image distance (ie, the second selected virtual image distance) between the eye E2 and the virtual image V2 as the distance Vd4 in response to receiving the user clicking the presbyopia display icon 54. The processor 130 can then determine the presbyopia degree of the eye E2 according to the distance Vd4. Similarly, in the embodiment of the present invention, the storage circuit 150 may store a look-up table associated with the presbyopia degree. The look-up table may record multiple presbyopia degrees and the selected virtual image distance corresponding to each presbyopia degree. Therefore, the processor 130 can search the above-mentioned look-up table according to the selected virtual image distance corresponding to the user's response to obtain the user's presbyopia degree.

It is worth mentioning that after performing vision detection of the degree of myopia and presbyopia, the processor 130 may record the user's diopter (ie, the degree of myopia and/or the degree of presbyopia) in the storage circuit 150. Later, when the user wants to use the head-mounted display device 10, the processor 130 can automatically adjust the distance between the display screen 120 and the lens 110 according to the recorded diopter to control the imaging position of another virtual image. In other words, the head-mounted display device 10 can be individually and automatically adjusted according to the diopters of the user's eyes, so that the user can clearly see the virtual image provided by the head-mounted display device 10.

Fig. 6 is a flowchart of a vision detection method according to an embodiment of the present invention. Please refer to FIG. 6, the method of this embodiment is applicable to the head-mounted display device 10 in the above-mentioned embodiment. The detailed steps of this embodiment are described below with various components in the head-mounted display device 10.

It should be noted that, in this embodiment, the vision check pattern may include a plurality of sub-patterns corresponding to a plurality of preset vision resolutions. The aforementioned sub-patterns may be the same symbols or characters corresponding to different pattern sizes, and correspond to different preset vision resolutions based on the corresponding pattern sizes.

In step S601, the processor 130 controls the display screen 120 to sequentially display sub-patterns corresponding to a plurality of preset vision resolutions according to the control command issued by the user. Specifically, the processor 130 can control the display screen 120 to sequentially display sub-patterns corresponding to different pattern sizes according to the control command. In one embodiment, the above-mentioned user's control command is, for example, the user clicks on an arrow pattern or other prompt icon in the graphical interface through a control stick. In step S602, the processor 130 detects the user's response. The above-mentioned user response may be a response operation of the user clicking a specific icon, or a response operation of the user replying to an incorrect answer.

In step S603, in response to receiving a user response when one of the sub-patterns is displayed, the processor 130 obtains the default vision resolution corresponding to the one of the sub-patterns. In step S604, the processor 130 determines the preset vision resolution corresponding to the one of the sub-patterns as the actual vision resolution of the eye. In other words, by sequentially displaying sub-patterns of different pattern sizes, the processor 130 can determine the actual vision resolution of the eye according to the user's response. It can be seen that the better the vision resolution of the eyes, the user can clearly see the sub-pattern with the smaller pattern size.

For example, FIG. 7 is a schematic diagram of detecting vision resolution according to an embodiment of the present invention. Please refer to FIG. 7, the processor 130 may first control the display screen 120 to display the graphic interface 71 including the sub-pattern 70 a of the first size. In this embodiment, the display screen 120 displays the English letter "E" including the first font size. The graphical interface 71 also includes arrow icons (icons) 72 and 73 and a vision display icon (icon) 74. If the user can clearly see the sub-pattern 70a consciously, the user can click the arrow icon 73 by controlling the stick. After that, the processor 130 may control the display screen 120 to display the graphic interface 75 including the sub-pattern 70b of the second size. In this embodiment, the display screen 120 displays the English letter "E" including the second font size. The second size is smaller than the first size. Assuming that the user feels that the sub-pattern 70b cannot be seen clearly, the user can click the vision display icon 74 by controlling the stick to move the cursor. Based on this, the processor 130 can obtain the default vision resolution "0.2" corresponding to the sub-pattern 70b in response to the user's response that the user clicks the vision display icon 74 when the sub-pattern 70b is displayed. And the default vision resolution "0.2" is judged as the user's actual vision resolution.

It is worth mentioning that the example shown in FIG. 7 is based on whether the user can clearly see the sub-patterns to determine the actual vision resolution. In another embodiment, the processor 130 can notify the user to make an answer based on the content or characteristics of the sub-pattern through a graphical interface, and the processor 130 can objectively determine the user's actual vision resolution according to whether the user's answer is correct. . For example, sub-patterns of different pattern sizes can also have different opening directions, and the user can answer the opening directions of the sub-patterns by waving the control stick. Once the user answers the wrong direction of the opening, the processor 130 can determine the user's response and determine the user's actual vision resolution.

In addition, in an embodiment of the present invention, the processor 130 can control the display resolution of the display screen 120 according to the user's actual vision resolution at a glance. Specifically, when the actual vision resolution is the first value, the display resolution of the screen displayed on the display screen 120 is adjusted to the first resolution. When the actual vision resolution is a second value lower than the first value, the display resolution of the picture displayed on the display screen 120 is adjusted to a second resolution lower than the first resolution. Specifically, for users with poor eyesight resolution, even if the display resolution is provided, it may be limited by the poor eyesight of the user and will not improve the viewing experience. Based on this, when the user's actual vision resolution is lower, the display resolution of the screen displayed on the display screen 120 can be configured to be lower. In this way, as the display resolution decreases, the computing resources for processing images can be significantly reduced. Similarly, the processor 130 can also control the display resolution of the display screen 160 according to the actual vision resolution of the user's other eye. For example, the processor 130 may adjust the display resolution according to Table 2. Among them, VGA in Table 2 is a video graphic array, and 2K, 4K, and 8K are high-definition (HD) corresponding to different resolutions. In other words, when a user with poor actual vision resolution uses the head-mounted display device 10, the present invention can increase the screen processing speed without affecting the user's experience. Table 2 Actual vision resolution 0.1 0.12 0.2 0.8 1.0 1.5 2.0 Resolution VGA 2K 4K 8K

FIG. 8 is a flowchart of a vision detection method according to an embodiment of the present invention. Please refer to FIG. 8, the method of this embodiment is applicable to the head-mounted display device 10 in the above-mentioned embodiment. The detailed steps of this embodiment are described below with various components in the head-mounted display device 10.

In step S801, the processor 130 controls the display screen 120 to display a vision check pattern related to color blindness detection. In other words, the vision inspection pattern is a designed color blindness inspection pattern. In step S802, the processor 130 detects the user's response. The user can answer the numbers or characters represented by the color blindness detection pattern by controlling the stick. Normal people and color blind patients have different answers. Therefore, in step S803, the processor 130 determines whether the user response is correct. If not, in step S804, the processor 130 determines that the user has color blindness. If yes, in step S805, the processor 130 determines that the user does not have color blindness.

For example, FIG. 9 is a schematic diagram of detecting color blindness according to an embodiment of the present invention. The display screen 120 displays a graphical interface 91 including a color blindness detection pattern 90. In addition, the graphical interface 91 further includes a confirmation icon 92 and an answer field 93. The user can watch the color blindness detection pattern 90, answer the number indicated by the color blindness detection pattern 90 in the answer column 93 by controlling the stick, and click the confirmation icon 92 after completing the answer. In this way, the processor 130 can determine whether the user suffers from color blindness according to whether the information input by the user in the answer field 93 is correct.

In an embodiment of the present invention, when the processor 130 determines that the user is color-blind, the display screen 120 displays the image at the first color depth. When the processor 130 determines that the user is not color-blind, the display screen 120 displays the image in the second color depth. In detail, for users suffering from color blindness, the color recognition rate is not good, so displaying too many colors wastes computing resources. Therefore, when the user is color-blind, the processor 130 can control the display screen 120 to display the image in the first color depth with fewer color types. When the user is color-blind, the processor 130 can control the display screen 120 to display the image in the second color depth with more color types. The first color depth is, for example, an 8-bit color depth, and the second color depth is, for example, a 24-bit color depth. In other words, when a user suffering from color blindness uses the head-mounted display device 10, the present invention can increase the screen processing speed without affecting the user experience.

FIG. 10 is a block diagram of a head-mounted display device according to an embodiment of the present invention. 10, the head-mounted display device 20 of this embodiment is different from the head-mounted display device 10 in that the head-mounted display device 20 further includes a rotation driving mechanism 180, a slot H1, a slot H2, and an auxiliary lenticular lens. 190a, and auxiliary lenticular lens 190b.

The auxiliary lenticular lenses 190a and 190b can be arranged in the transmission path of the image beam to change the refractive index of the light in a specific direction, so as to achieve the functions of correcting astigmatism and measuring astigmatism. In the embodiment of the present invention, the mechanism of the head-mounted display device 20 may be designed to have a slot H1 and a slot H2 respectively located in front of the eyes. The auxiliary lenticular lenses 190a and 190b are adapted to be inserted into the slot H1 and the slot H2, respectively. The rotation driving mechanism 180 connects the processor 130 and the auxiliary lenticular lenses 190a and 190b, and the rotation driving mechanism 180 is used to rotate the auxiliary lenticular lenses 190a and 190b in the slots H1 and H2.

FIG. 11 is a flowchart of a vision detection method according to an embodiment of the invention. The method shown in FIG. 11 is applicable to the head-mounted display device 20 in the above-mentioned embodiment. The detailed steps of this embodiment are described below with various components in the head-mounted display device 20.

It should be noted that, in the embodiment of the present invention, the visual acuity detection pattern may include an astigmatism axis meter to perform astigmatism detection. For example, FIG. 12 is an example of an astigmatism axis table according to an embodiment of the present invention. The astigmatism axis degree table X1 has a plurality of radially black lines, and these black lines respectively correspond to different astigmatism axis degrees. In step S1101, the processor 130 controls the display screen 120 to display the astigmatism axis meter. In detail, when a user suffers from astigmatism, the degree of deformation of the cornea of his eye is uneven. Therefore, when the user looks at the astigmatism axis degree table X1, the black line on the astigmatism axis degree table X1 will show a different definition. In step S1102, the processor 130 receives a user response of the selected astigmatism axis degree on the astigmatism axis degree table. Specifically, the user can select a specific astigmatism axis degree by clicking on the clearest black line on the astigmatism axis degree table by controlling the stick, and the processor 130 will also receive the user’s selected astigmatism axis degree table. The user’s response to the astigmatism axis. For example, if the user feels that the black line with the astigmatism axis degree of 40∘ on the astigmatism axis meter X1 is the clearest, the user can use the cursor to select the black line with the astigmatism axis degree of 40∘.

Based on this, in step S1103, the processor 130 obtains the astigmatism axial degree of the eye according to the user's response. After obtaining the axial degree of astigmatism, the user can insert the auxiliary lenticular lens 190a into the slot H1. After that, in step S1104, the processor 130 determines whether another user response is received while rotating the auxiliary lenticular lens 190a through the rotation driving mechanism 180 and adjusting the position of the lens 110 through the driving mechanism 140. Specifically, as the auxiliary lenticular lens 190a rotates, the user can feel that each black line on the astigmatism axis scale is uniformly displayed and clear when the auxiliary lenticular lens 190a is rotated to a specific angle. In addition, the processor 130 can measure the astigmatism by adjusting the rotation state of the auxiliary lenticular lens 190a and the position of the control lens 110, so as to obtain the refractive power of the eye in different axial degrees. In other words, the processor 130 can determine whether another user response is received while rotating the auxiliary lenticular lens 190a and adjusting the position of the lens 110 through the rotation driving mechanism 180. Then, in step S1105, the processor 130 obtains the astigmatism of the eye according to the rotation state of the auxiliary lenticular lens 190a and the position of the lens 110 in response to another user's response.

FIG. 13 is a block diagram of a head-mounted display device according to an embodiment of the present invention. Referring to FIG. 13, the head-mounted display device 30 of this embodiment differs from the head-mounted display device 10 in that the head-mounted display device 30 further includes an electrically controlled liquid crystal lens VL1 and a battery respectively arranged in front of the left eye and the right eye. Control liquid crystal lens VL1.

The electronically controlled liquid crystal lenses VL1 and VL1 can be arranged in the transmission path of the image beam to change the refractive index of different positions on the electronically controlled liquid crystal lenses VL1 and VL1, so as to achieve the functions of correcting astigmatism and measuring astigmatism. In the embodiment of the present invention, the electrically controlled liquid crystal lenses VL1 and VL1 can use voltage to change the rotation direction of the liquid crystal cell, thereby providing different refractive indexes at different positions on the lens.

FIG. 14 is a flowchart of a vision detection method according to an embodiment of the present invention. The method shown in FIG. 14 is applicable to the head-mounted display device 30 in the above-mentioned embodiment. The detailed steps of this embodiment will be described below in conjunction with various components in the head-mounted display device 30.

In step S1401, the processor 130 controls the display screen 120 to display the astigmatism axis meter. In step S1402, the processor 130 receives a user response of the selected astigmatism axis degree on the astigmatism axis degree table. In step S1403, the processor 130 obtains the astigmatism axial degree of the eye according to the user's response. Steps S1401 to S1403 are similar to steps S1101 to S1103 in the embodiment of FIG. 11, and will not be repeated here.

It should be particularly noted that in step S1404, the processor 130 controls the rotation of the liquid crystal unit of the electronically controlled liquid crystal lens VL1 and determines whether another user response is received. In step S1405, the processor 130 obtains the astigmatism of the eye according to the rotation state of the liquid crystal cell in response to another user's response. Specifically, after obtaining the astigmatism axis degree of the user, the processor 130 can control the plurality of liquid crystal cells on the electronically controlled liquid crystal lens VL1 to rotate to a specific angle according to the astigmatism axis degree, which can achieve the astigmatism correction effect such as a cylindrical lens . In addition, the processor 130 can control the rotation of multiple liquid crystal cells on the electronically controlled liquid crystal lens VL1 based on the astigmatism refraction process, so that the electronically controlled liquid crystal lens VL1 can present different refraction states, so that the processor 130 can obtain the astigmatism power according to the user's response. .

It is worth mentioning that after obtaining the astigmatism and the astigmatism of the user, the processor 130 may record the astigmatism and the astigmatism in the storage circuit 150. In the future, when the user wants to use the head-mounted display device 20, 30, the processor 130 can automatically adjust the rotation angle of the auxiliary lenticular lens 190a, 190b or automatically adjust the electronically controlled liquid crystal lens VL1, VL2 according to the astigmatism axis degree and the astigmatism degree. The rotation state of the upper liquid crystal cell. In this way, even if the degree of astigmatism of the user is different, the head-mounted display device 20, 30 provided by the present invention can still provide a good display effect.

To sum up, in the embodiment of the present invention, the head-mounted display device can display the visual inspection pattern according to the user's control, so that the user can perform visual inspection. In addition, based on the user response issued by the user, the head-mounted display device can confirm the user's vision status according to the display content or display mode of the vision check pattern related to the user's response. Based on this, the head-mounted display device can automatically adjust the configuration of the optical components and/or the display screen according to the personalized vision state to provide the best viewing experience. In addition, when a user with a special vision condition uses the head-mounted display device, the embodiment of the present invention can save computing performance without affecting the viewing experience.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be determined by the scope of the attached patent application.

10, 20, 30: head-mounted display device 110, 170: lens 120, 160: display screen 130: processor 140: drive mechanism 150: storage circuit 41, 51, 71, 75, 91: Graphical interface 40, 50, 90: vision test pattern 42, 43, 52, 53, 72, 73: Arrow icon 44: Myopia degree display icon 53: Presbyopia degree display icon 74: Vision display icon 92: Answer field 93: Confirmation icon E1, E2: eyes V1, V2: virtual image 70a, 70b: Sub-pattern G1～G4, Vd1～Vd4: distance H1, H2: Slot 190a, 190b: auxiliary cylindrical lens 180: Rotary drive mechanism VL1, VL1: Electronically controlled liquid crystal lens S201～S203, S301～S305, S601～S604, S801～S805, S1101～S1105, S1401～S1405: steps

FIG. 1A is a block diagram of a head-mounted display device according to an embodiment of the present invention. FIG. 1B is a schematic diagram of a head-mounted display device according to an embodiment of the present invention. Fig. 2 is a flowchart of a vision detection method according to an embodiment of the present invention. FIG. 3 is a flowchart of a vision detection method according to an embodiment of the present invention. 4A and 4B are schematic diagrams of detecting myopia according to an embodiment of the present invention. 5A and 5B are schematic diagrams of detecting presbyopia according to an embodiment of the present invention. Fig. 6 is a flowchart of a vision detection method according to an embodiment of the present invention. FIG. 7 is a schematic diagram of detecting vision resolution according to an embodiment of the present invention. FIG. 8 is a flowchart of a vision detection method according to an embodiment of the present invention. FIG. 9 is a schematic diagram of detecting color blindness according to an embodiment of the present invention. FIG. 10 is a block diagram of a head-mounted display device according to an embodiment of the present invention. FIG. 11 is a flowchart of a vision detection method according to an embodiment of the invention. FIG. 12 is an example of an astigmatism axial degree table drawn according to an embodiment of the present invention. FIG. 13 is a block diagram of a head-mounted display device according to an embodiment of the present invention. FIG. 14 is a flowchart of a vision detection method according to an embodiment of the present invention.

S201~S203: steps

Claims (10)

A head-mounted display device, suitable for being arranged in front of an eye of a user, includes: At least one display screen, providing image beams; At least one lens is arranged on the transmission path of the image light beam, and transmits the image light beam to the eye; A storage circuit storing a plurality of instructions; and A processor, coupled to the storage circuit and the at least one display screen, and configured to execute the commands to: Controlling the at least one display screen to display a vision inspection pattern so that the at least one lens provides a virtual image including the vision inspection pattern; Receiving a user response corresponding to the vision check pattern; and Judging a vision state of the user based on the user's response. The head-mounted display device described in item 1 of the scope of patent application further includes: A driving mechanism connected to the at least one display screen or the at least one lens, The processor is configured to control the driving mechanism to adjust the distance between the at least one display screen and the at least one lens according to the control command issued by the user, so that the virtual image distance between the virtual image and the eye is within a range Change within the preset interval, The processor is configured to obtain a selected virtual image distance in the predetermined interval in response to receiving the user response, and determine a diopter of the eye according to the selected virtual image distance. According to the head-mounted display device of claim 2, wherein the processor is configured to control the driving mechanism to gradually increase the distance between the at least one display screen and the at least one lens, so that the virtual image and The virtual image distance between the eyes gradually increases in the first preset interval among the preset intervals, The processor is configured to obtain a first selected virtual image distance in the selected virtual image distance in response to receiving the user response, and determine a myopia degree of the eye according to the first selected virtual image distance. According to the head-mounted display device of claim 2, wherein the processor is configured to control the driving mechanism to gradually reduce the distance between the at least one display screen and the at least one lens, so that the virtual image and The virtual image distance between the eyes gradually decreases in a second preset interval of the preset interval, The processor is configured to obtain a second selected virtual image distance in the selected virtual image distance in response to receiving the user response, and determine a presbyopia degree of the eye according to the second selected virtual image distance. The head-mounted display device according to claim 1, wherein the vision check pattern includes a plurality of sub-patterns corresponding to a plurality of preset vision resolutions, and the processor is configured to follow a control command issued by the user To control the at least one display screen to sequentially display the sub-patterns, The processor is configured to respond to receiving the user response when displaying one of the sub-patterns, and according to one of the predetermined vision resolutions corresponding to the one of the sub-patterns Determine the actual vision resolution of the eye. The head-mounted display device according to claim 5, wherein the processor is configured to control the display resolution of the at least one display screen according to the actual vision resolution; when the actual vision resolution is the first value When the display resolution is adjusted to a first resolution, when the actual vision resolution is a second value lower than the first value, the display resolution is adjusted to a lower resolution than the first resolution. The second resolution. The head-mounted display device described in item 1 of the scope of patent application further includes: An auxiliary lenticular lens arranged on the transmission path of the image beam; and A rotation driving mechanism connected to the auxiliary lenticular lens, wherein the processor is configured to control the rotation of the auxiliary lenticular lens according to the astigmatism axis degree, The processor is configured to determine whether another user response is received while rotating the auxiliary lenticular lens and adjusting the position of the at least one lens, and in response to the other user’s response, according to the auxiliary lenticular lens Get the astigmatism of the eye. The head-mounted display device described in item 1 of the scope of patent application further includes: An electrically controlled liquid crystal lens is arranged on the transmission path of the image beam, The processor is configured to control the rotation of the liquid crystal cells on the electronically controlled liquid crystal lens according to the astigmatism axis degree, The processor is configured to determine whether to receive a response from another user while controlling the rotation of the liquid crystal units, and to obtain the astigmatism of the eye according to the rotation state of the liquid crystal units in response to the response of the other user . According to the head-mounted display device described in claim 1, wherein the vision check pattern includes a color blindness detection pattern, and the processor is configured to receive the user response corresponding to the color blindness detection pattern, and based on the use The user responds correctly to determine whether the user has color blindness; when it is determined that the user has color blindness, the at least one display screen displays the screen with the first color depth; and when it is determined that the user is not color blind, the at least one display screen is displayed with the first color depth. Two color depth display screen. A vision detection method is suitable for a head-mounted display device, wherein the head-mounted display device is suitable for being arranged in front of an eye of a user, and the method includes: Controlling at least one display screen of the head-mounted display device to display a vision inspection pattern so that at least one lens of the head-mounted display device provides a virtual image including the vision inspection pattern; Receiving a user response corresponding to the vision check pattern; and Judging a vision state of the user based on the user's response.

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