Method and device for correcting visual acuity by means of VR display device for VR experience

Abstract

A method and device for correcting visual acuity by means of a VR display device for VR experience. A varifocal liquid crystal lens (03) is added to a VR display device, an electronic visual acuity chart is displayed on a display screen (02), a zoom instruction is sent on a VR display interface to generate a picture corresponding to a focal length, and the picture is sent by means of a video interface to control the varifocal liquid crystal lens (03) to change the diopter, so as to match the visual acuity value of a wearer, so that a clear VR picture can be viewed. Thus, the same VR display device can be used by users having different visual acuity values.

Description

Method and device for correcting vision and performing VR experience through VR display device

[0001] This application claims priority to a Chinese patent application filed with the Patent Office of China on January 13, 2024, with application number 202410049745.0, entitled “Method and device for correcting vision for VR experience through VR display device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The embodiments of the present application belong to the field of AR display technology, and in particular to a method for correcting vision through a VR display device to provide a VR experience, and a VR display device. Background Art

[0003] Currently, VR display devices are widely used. When a VR display device needs to be used by people with different vision strengths, vision correction is required. There are generally three vision correction methods for VR devices on the market: the first is to watch directly through myopia glasses. This method will cause interference with structural parts, making it uncomfortable to wear and difficult to adjust for the best viewing effect; the second is to add an additional pair of suction-type myopia lenses. This method requires changing different lenses for people with different degrees of vision, which is very inconvenient to use; the third is to adjust the eyepiece power by mechanically adjusting the distance between the eyepiece lens groups or the distance between the eyepiece group and the screen. This method increases the thickness of the VR device and requires a physical knob for adjustment, which is also inconvenient in actual use. Technical Solutions

[0004] To solve or alleviate the problems in the prior art, an embodiment of the present invention provides a method for correcting vision and providing a VR experience through a VR display device. The VR display device includes a variable-focus liquid crystal lens and a display screen. The variable-focus liquid crystal lens and the display screen are connected via a controller. The method is applied to the controller in the VR display device, and the method includes:

[0005] receiving a request from a user to change the diopter of the variable focus liquid crystal lens by inputting a corrected target vision degree or a vision plus or minus degree on a display screen of a VR display device;

[0006] determining a focal length of the variable focus liquid crystal lens according to a request to change the diopter of the variable focus liquid crystal lens;

[0007] By testing the optical path difference of the variable focus liquid crystal lens at different grayscales, a grayscale-optical path difference curve is obtained;

[0008] Determining the grayscale that should be input to each annular electrode corresponding to any focal length based on an optical path difference curve of an ideal lens and the grayscale-optical path difference curve, and then determining the grayscale that should be input to each annular electrode based on the determined focal length of the variable focus liquid crystal lens. A color image is obtained based on the grayscale that should be input to each annular electrode, wherein the grayscale of a sub-pixel of each pixel in the color image corresponds to the voltage of different annular electrodes of the variable focus liquid crystal lens;

[0009] The color image is converted into an electrical signal, which is used to control the liquid crystal molecules in the variable focus liquid crystal lens to form an optical path difference distribution corresponding to the focal length, thereby adjusting the diopter of the variable focus liquid crystal lens and providing the user with a VR experience after vision correction.

[0010] As a preferred embodiment of the present application, before receiving a user's request to change the diopter of the variable focus liquid crystal lens by inputting a corrected target vision degree or a vision plus or minus degree on a display screen of a VR display device, the method includes:

[0011] An electronic eye chart is sent to a display screen of a VR display device, and the user uses the electronic eye chart to test his or her vision.

[0012] As a preferred embodiment of the present application, a display screen of the VR display device is provided with an eyepiece diopter adjustment control, and the target visual acuity correction degree or visual acuity addition or subtraction degree is input through the adjustment control.

[0013] As a preferred embodiment of the present application, converting the color image into an electrical signal, and controlling the liquid crystal molecules in the variable focus liquid crystal lens to form an optical path difference distribution corresponding to the focal length by the electrical signal to adjust the diopter of the variable focus liquid crystal lens, includes:

[0014] The color image is transmitted to a display driver chip connected to a variable focus liquid crystal lens through a video interface, and the display driver chip distributes the video signal output by the video interface to each signal channel of the output end of the display driver chip to form an electrical signal;

[0015] The liquid crystal molecules in the variable focus liquid crystal lens are controlled by the electrical signal in each signal channel to deflect under the action of the electric field, forming an optical path difference distribution corresponding to the focal length, thereby adjusting the diopter of the variable focus liquid crystal lens.

[0016] As a preferred embodiment of the present application, controlling the liquid crystal molecules in the liquid crystal lens to deflect under the action of an electric field by using an electrical signal in each signal channel includes:

[0017] Each annular electrode of the variable focus liquid crystal lens is charged to a target voltage through the electrical signal in each signal channel, forming a vertical electric field between the lower substrate and the upper substrate of the variable focus liquid crystal lens. This controls the liquid crystal molecules in the variable focus liquid crystal lens to deflect under the action of the electric field, thereby adjusting the diopter of the variable focus liquid crystal lens.

[0018] As a preferred embodiment of the present application, the method of converting the color image into an electrical signal and controlling the liquid crystal molecules in the variable focus liquid crystal lens to form an optical path difference distribution corresponding to the focal length by the electrical signal to adjust the diopter of the variable focus liquid crystal lens, thereby providing a VR experience after the user's vision is corrected, includes:

[0019] determining whether a request for readjusting the diopter by the user has been received;

[0020] If yes, the diopter of the zoom liquid crystal lens is readjusted; if not, the VR experience after the user's vision is corrected is performed according to the currently adjusted diopter of the zoom liquid crystal lens.

[0021] Compared with the existing technology, the embodiments of the present application provide a method for correcting vision and experiencing VR through a VR display device. By adding an electronic zoom liquid crystal lens to the VR display device and displaying an electronic eye chart on the VR display screen, zoom instructions are sent on the VR display interface, and pictures are sent through the video interface to control the zoom liquid crystal lens to change the refractive power to adapt to the wearer's eyesight, so that clear VR images can be viewed, allowing the same VR display device to be used by people with different eyesight.

[0022] In a second aspect, an embodiment of the present application provides a head-mounted VR display device with a vision correction function, for implementing the method described in any one of the first aspects; the device includes:

[0023] A display screen is used to display a user's eye chart so that the user can perform self-testing of vision, and is also used for the user to input a corrected target visual acuity value or a visual acuity plus or minus value based on the self-tested vision;

[0024] A variable focus liquid crystal lens for correcting the user's vision according to the target vision correction degree or vision plus or minus degree input by the user on the display screen;

[0025] The controller is used to receive a request to change the diopter of the variable focus liquid crystal lens, and the optical path difference curve of the ideal lens and the grayscale-optical path difference curve, to obtain the grayscale that should be input by each annular electrode corresponding to any focal length, and then determine the grayscale that should be input by each corresponding annular electrode according to the determined focal length of the variable focus liquid crystal lens, and obtain a color picture according to the grayscale that should be input by each annular electrode, wherein the grayscale of the sub-pixel of each pixel in the color picture corresponds to the different annular electrodes of the variable focus liquid crystal lens, and the color picture is converted into an electrical signal, and the liquid crystal molecules in the variable focus liquid crystal lens are controlled by the electrical signal to form an optical path difference distribution corresponding to the focal length, so as to adjust the diopter of the variable focus liquid crystal lens, and then provide the user with a VR experience after vision correction.

[0026] Compared with the prior art, the beneficial effects of a head-mounted VR display device with vision correction function provided by an embodiment of the present application are the same as those of the first aspect and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. Some specific embodiments of the present application will be described in detail in an illustrative and non-restrictive manner with reference to the drawings. The same reference numerals in the drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the drawings:

[0028] FIG1 is a flow chart of a method for correcting vision and performing a VR experience through a VR display device, provided in an embodiment of the present application;

[0029] FIG2 is a schematic diagram of each sub-pixel of a color image corresponding to different annular electrodes of a strain-focus liquid crystal lens provided by an embodiment of the present application;

[0030] FIG3 is a schematic diagram of a grayscale-optical path difference test optical path provided in an embodiment of the present application;

[0031] FIG4 is a grayscale-light intensity relationship diagram of a color image provided in an embodiment of the present application;

[0032] FIG5 is a diagram showing the relationship between grayscale and optical path difference of a color image provided in an embodiment of the present application;

[0033] FIG6 is a diagram showing the relationship between electrodes and grayscale in a liquid crystal lens according to an embodiment of the present application;

[0034] FIG7 is a schematic structural diagram of a head-mounted VR display device with vision correction function provided in an embodiment of the present application. Modes for Carrying Out the Invention

[0035] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0036] As shown in FIG1 , in a first aspect, an embodiment of the present application provides a method for correcting vision and performing a VR experience through a VR display device, wherein the VR display device includes a variable focus liquid crystal lens and a display screen, wherein the variable focus liquid crystal lens and the display screen are connected via a controller, and the method is applied to the controller in the VR display device, and the method includes:

[0037] Step S01, receiving a request from a user to change the diopter of a variable focus liquid crystal lens by inputting a target vision correction value or a vision plus or minus value on a display screen of a VR display device;

[0038] Before step S01, the following steps are included:

[0039] An electronic eye chart is sent to a display screen of a VR display device, and the user uses the electronic eye chart to test his or her vision.

[0040] Specifically, when a user uses a VR display device to correct their vision for a VR experience, they need to wear the VR display device on their head. If the user needs to correct their vision, they can control the VR display device to turn on the vision correction function. The VR display screen will display an electronic eye chart, which can be displayed separately for the left and right eyes. That is, when the electronic eye chart is displayed for the left eye, the right eye will see a black screen, and when the electronic eye chart is displayed for the right eye, the left eye will see a black screen. This allows the vision correction status of the left and right eyes to be tested separately. After the user tests their vision using the electronic eye chart, they can input the target corrected vision degree or the visual acuity plus or minus degree on the VR display screen to request a change in the diopter of the zoom liquid crystal lens.

[0041] Specifically, a display screen of the VR display device is provided with an eyepiece diopter adjustment control, and the target visual acuity correction degree or visual acuity addition or subtraction degree is input through the adjustment control.

[0042] It should be noted that the user can directly input the degree based on self-tested vision through the diopter adjustment control, or can input the degree that needs to be increased or decreased based on the original degree through the adjustment control. This can be decided by the user according to his or her usage habits.

[0043] Step S02, determining the focal length of the variable focus liquid crystal lens according to a request to change the diopter of the variable focus liquid crystal lens;

[0044] Step S03, obtaining a grayscale-optical path difference curve by measuring the optical path difference of the variable focus liquid crystal lens at different grayscales;

[0045] Step S04: Based on the optical path difference curve of the ideal lens and the grayscale-optical path difference curve, the grayscale that each annular electrode should input corresponding to any focal length is obtained, and then the grayscale that each annular electrode should input corresponding to the determined focal length of the variable focus liquid crystal lens is determined, and a color image is obtained based on the grayscale that each annular electrode should input.

[0046] It should be noted that after receiving the user's corresponding refractive power instruction, the controller generates a color image. This color image contains the grayscale information corresponding to each annular electrode of the zoom liquid crystal lens. Specifically, as shown in Figure 2, it is a certain area of ​​the color image, where R (red), G (green), and B (blue) represent the red, green, and blue sub-pixels corresponding to each pixel, respectively. Each sub-pixel corresponds to a different annular electrode of the zoom liquid crystal lens. Therefore, the color image can be used as an input signal to control the zoom liquid crystal lens.

[0047] In the embodiments of this application, to obtain color images at different focal lengths, it is necessary to first establish the following optical path. By measuring the optical path difference of the variable focus liquid crystal lens at different grayscales, a grayscale-optical path difference curve can be obtained. The specific method is to establish the optical path shown in Figure 3 before assembling the variable focus liquid crystal lens. The liquid crystal lens is controlled by inputting an entire grayscale image. At each grayscale, a camera is used to capture an intensity image of the collimated laser passing through the first polarizer, the liquid crystal lens, and the second polarizer. The grayscale-light intensity curve shown in Figure 4 can be obtained.

[0048] According to the variation law of the optical path difference and light intensity of the liquid crystal lens, that is, the optical path difference between two peaks is one wavelength, the curve shown in FIG4 can be converted into the relationship between grayscale and optical path difference, as shown in FIG5.

[0049] According to the optical path difference curve of the ideal lens and the grayscale-optical path difference curve obtained in Figure 5, the grayscale that should be input to each annular electrode corresponding to any focal length can be obtained. As shown in Figure 6, it is the grayscale corresponding to each electrode at a certain focal length of the variable focus liquid crystal lens.

[0050] Step S05: converting the color image into an electrical signal, and controlling the liquid crystal molecules in the variable focus liquid crystal lens through the electrical signal to form an optical path difference distribution corresponding to the focal length, thereby adjusting the diopter of the variable focus liquid crystal lens and providing the user with a VR experience after vision correction.

[0051] It should be noted that converting the color image into an electrical signal and controlling the liquid crystal molecules in the variable focus liquid crystal lens to form an optical path difference distribution corresponding to the focal length by the electrical signal to adjust the diopter of the variable focus liquid crystal lens includes:

[0052] The color image is transmitted to a display driver chip connected to a liquid crystal lens through a video interface, and the display driver chip distributes the video signal output by the video interface to each signal channel of the output end of the display driver chip to form an electrical signal;

[0053] The liquid crystal molecules in the variable focus liquid crystal lens are controlled by the electrical signal in each signal channel to deflect under the action of the electric field, forming an optical path difference distribution corresponding to the focal length, thereby adjusting the diopter of the variable focus liquid crystal lens.

[0054] The method of controlling the liquid crystal molecules in the liquid crystal lens to deflect under the action of the electric field by the electric signal in each signal channel includes:

[0055] Each annular electrode of the variable focus liquid crystal lens is charged to a target voltage through the electrical signal in each signal channel, forming a vertical electric field between the lower substrate and the upper substrate of the variable focus liquid crystal lens. This controls the liquid crystal molecules in the variable focus liquid crystal lens to deflect under the action of the electric field, thereby adjusting the diopter of the variable focus liquid crystal lens.

[0056] Step S06, after adjusting the diopter of the liquid crystal lens according to the color image, includes:

[0057] determining whether a request for readjusting the diopter by the user has been received;

[0058] If yes, the diopter of the zoom liquid crystal lens is readjusted; if not, the VR experience after the user's vision is corrected is performed according to the currently adjusted diopter of the zoom liquid crystal lens.

[0059] In an embodiment of the present application, if the user finds that the most recent VR experience has not been achieved after correcting their vision once, they can correct their vision again. The second vision correction process is the same as the first vision correction method, and will not be repeated here.

[0060] As shown in FIG7 , in a second aspect, an embodiment of the present application provides a head-mounted VR display device with a vision correction function, the device comprising:

[0061] Display screen 02 is used to display a user's eye chart so that the user can self-test their eyesight, and is also used for the user to input the corrected target vision degree or vision plus or minus degree according to the self-tested vision;

[0062] A variable focus liquid crystal lens 03 is used to correct the user's vision according to the target vision correction degree or vision plus or minus degree input by the user on the display screen;

[0063] Controller 01 is used to receive a request to change the diopter of the variable focus liquid crystal lens, and obtain a grayscale-optical path difference curve by testing the optical path difference of the variable focus liquid crystal lens at different grayscales; obtain the grayscale that should be input by each annular electrode corresponding to any focal length according to the optical path difference curve of the ideal lens and the grayscale-optical path difference curve, and then determine the grayscale that should be input by each corresponding annular electrode according to the determined focal length of the variable focus liquid crystal lens, and obtain a color picture according to the grayscale that should be input by each annular electrode, in which the grayscale of the sub-pixel of each pixel in the color picture corresponds to the voltage of different annular electrodes of the variable focus liquid crystal lens; convert the color picture into an electrical signal, and control the liquid crystal molecules in the variable focus liquid crystal lens through the electrical signal to form an optical path difference distribution corresponding to the focal length, thereby adjusting the diopter of the variable focus liquid crystal lens to provide the user with a VR experience after vision correction.

[0064] The present invention provides a head-mounted VR display device with a vision correction function. An electronic eye chart is displayed on the VR screen of the VR display device. The electronic eye chart is converted from a standard eye chart based on the virtual image distance of the VR display device and the magnification of the imaging system, and can be used for self-testing of the user's vision. At the same time, the VR screen also displays an eyepiece diopter adjustment control, which allows direct input of diopter values ​​or addition and subtraction of diopter values. After receiving the corresponding diopter command, the controller generates a color image and transmits it to an LCD-DDIC (display driver IC, DDIC) connected to a liquid crystal lens via a video interface. The LCD-DDIC distributes the video signal to various signal channels at the output end of the LCD-DDIC in the form of line scans. Each signal channel is connected to each annular electrode corresponding to the lower substrate of the liquid crystal lens (the side with patterned electrodes is referred to as the lower substrate here). The annular electrodes are charged to a corresponding voltage, forming a vertical electric field with the upper substrate of the liquid crystal lens (the side with the entire surface of electrodes is referred to as the upper substrate here). Liquid crystal molecules in the corresponding area are deflected by the electric field, forming an OPD (optical path difference) corresponding to the focal length. The eyepiece and display are pre-designed for a close virtual image distance. By designing the eyepiece's focal length or the distance between the eyepiece and the screen, the initial state is set to accommodate x D of diopters, meaning the distance is set to 1 / x meters. The varifocal liquid crystal lens itself can achieve ±y D of diopters. Therefore, the combined diopters of the varifocal liquid crystal lens and eyepiece system have an adjustable diopter range of (x+y)D to (xy)D. For example, if the eyepiece's initial state is -3D diopters and the varifocal liquid crystal lens's adjustment range is ±3D diopters, the total diopter adjustment range is 0D to 6D, meeting the vision needs of people with normal vision and those with myopia within 6D (600 degrees).

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for correcting eyesight through a VR display device for VR experience, characterized in that, The VR display device includes a zoom liquid crystal lens and a display screen. The zoom liquid crystal lens and the display screen are connected by a controller. The method is applied to the controller in the VR display device, and the method includes: Receiving a request from a user to change the diopter of the zoom liquid crystal lens by inputting a corrected target refractive power or a refractive power addition or subtraction degree on the display screen of the VR display device; Determining the focal length of the zoom liquid crystal lens according to the request to change the diopter of the zoom liquid crystal lens; Obtaining a gray scale - optical path difference curve by testing the optical path difference of the zoom liquid crystal lens at different gray scales; According to the optical path difference curve of the ideal lens and the gray scale - optical path difference curve, obtaining the gray scale that should be input for each annular electrode corresponding to any focal length, and then determining the gray scale that should be input for each corresponding annular electrode according to the determined focal length of the zoom liquid crystal lens. Obtaining a color picture according to the gray scale that should be input for each annular electrode, where the gray scale of the sub - pixels of each pixel in the color picture corresponds to the voltage of different annular electrodes of the zoom liquid crystal lens; Converting the color picture into an electrical signal, and controlling the liquid crystal molecules in the zoom liquid crystal lens to form an optical path difference distribution corresponding to the focal length through the electrical signal, so as to adjust the diopter of the zoom liquid crystal lens, and further performing a VR experience after correcting the user's eyesight.

2. The method for correcting eyesight through a VR display device for VR experience according to claim 1, wherein Before the step of receiving a request from a user to change the diopter of the zoom liquid crystal lens by inputting a corrected target refractive power or a refractive power addition or subtraction degree on the display screen of the VR display device, it includes: Sending an electronic eye chart to the display screen of the VR display device, and the user tests their eyesight by themselves through the electronic eye chart.

3. A method for correcting eyesight through a VR display device for VR experience as claimed in claim 1, characterized in that, A display eyepiece diopter adjustment control is provided on the display screen of the VR display device, and a corrected target refractive power or a refractive power addition or subtraction degree is input through the adjustment control.

4. A method for correcting eyesight through a VR display device for VR experience as claimed in claim 1, wherein, The step of converting the color picture into an electrical signal, and controlling the liquid crystal molecules in the zoom liquid crystal lens to form an optical path difference distribution corresponding to the focal length through the electrical signal, so as to adjust the diopter of the zoom liquid crystal lens, includes: Transmitting the color picture to a display driver chip connected to the zoom liquid crystal lens through a video interface, and the display driver chip distributes the video signal output from the video interface to each signal channel at the output end of the display driver chip to form an electrical signal; Controlling the liquid crystal molecules in the zoom liquid crystal lens to deflect under the action of an electric field through the electrical signal in each signal channel, forming an optical path difference distribution corresponding to the focal length, so as to adjust the diopter of the zoom liquid crystal lens.

5. A method for correcting vision through a VR display device for VR experience as claimed in claim 4, wherein The step of controlling the liquid crystal molecules in the zoom liquid crystal lens to deflect under the action of an electric field through the electrical signal in each signal channel includes: Charging each annular electrode of the zoom liquid crystal lens to a target voltage through the electrical signal in each signal channel, forming a vertical electric field between the lower substrate and the upper substrate of the zoom liquid crystal lens, and then controlling the liquid crystal molecules in the zoom liquid crystal lens to deflect under the action of the electric field, so as to adjust the diopter of the zoom liquid crystal lens.

6. The method for correcting eyesight through a VR display device for VR experience according to claim 1, wherein, After converting the color picture into an electrical signal, controlling liquid crystal molecules in the zoom liquid crystal lens to form an optical path difference distribution corresponding to a focal length through the electrical signal to adjust the diopter of the zoom liquid crystal lens, and then performing a VR experience after user visual acuity correction, it includes: Determine whether a request for the user to readjust the diopter is received; If so, readjust the diopter of the zoom liquid crystal lens; if not, perform a VR experience after user visual acuity correction according to the diopter of the currently adjusted zoom liquid crystal lens.

7. A head-mounted VR display device with vision correction function, characterized in that, For implementing the method according to any one of claims 1 to 6; the device includes: A display screen for displaying a user eye chart for the user to self-test visual acuity, and also for the user to input a target diopter for correction or a diopter addition or subtraction based on the self-tested visual acuity; A zoom liquid crystal lens for correcting the user's visual acuity according to the target diopter for correction or the diopter addition or subtraction input by the user on the display screen; A controller for receiving a request to change the diopter of the zoom liquid crystal lens, and obtaining the gray levels that should be input to each annular electrode corresponding to any focal length according to the optical path difference curve of the ideal lens and the gray level - optical path difference curve, and then determining the gray levels that should be input to the corresponding annular electrodes according to the determined focal length of the zoom liquid crystal lens, and obtaining a color picture according to the gray levels that should be input to each annular electrode, where the gray levels of the sub-pixels of each pixel in the color picture correspond to different annular electrodes of the zoom liquid crystal lens; Convert the color picture into an electrical signal, control liquid crystal molecules in the zoom liquid crystal lens to form an optical path difference distribution corresponding to a focal length through the electrical signal to adjust the diopter of the zoom liquid crystal lens, and then perform a VR experience after user visual acuity correction.

Images