A diopter digital display method and system for head mounted display and head mounted display

Abstract

The present invention relates to a diopter digital display method, system and head-mounted display of a head-mounted display, wherein the diopter digital display method comprises the following steps: using a cam structure to adjust the relative distance between a display component and an optical component of the head-mounted display, and driving the sliding part of a sliding rheostat to move during the adjustment; presetting a mapping relationship between a diopter value and a change amount of the sliding rheostat; according to the mapping relationship, converting the change amount into a corresponding diopter numerical signal; and the display component displays the diopter value according to the diopter numerical signal. The present application utilizes the motion change of a mechanical structure to realize the feedback of an electronic signal and realize the diopter digital display, and can avoid the errors existing in components such as a cam structure, a sliding rheostat and a main control component from affecting the adjustment accuracy of the diopter, and control the precision error of the diopter digital display within the range of ±25°.

Description

Technical Field

[0001] The present invention relates to the technical field of head mounted displays, and more particularly to a method and system for digitally displaying diopter of a head mounted display and a head mounted display. Background Art

[0002] The head-mounted display uses optical technology to guide the video image light emitted by a micro-image display (such as a transmissive or reflective liquid crystal display, an organic electroluminescent device, a DMD device) to the user's pupil, realizing virtual and magnified images within the user's near-eye range, and providing the user with intuitive and visual 2D / 3D images, videos and text information.

[0003] For people with poor vision, before using the head-mounted display, it is necessary to adjust the diopter of the head-mounted display to adapt to the user's vision. Traditional head-mounted displays do not have specific adjustment values ​​displayed, and adjustments can only be made through blind operation, which is not convenient for memorizing and tracing adjustments.

[0004] To solve the above problems, existing head-mounted displays use the cooperation of mechanical structures and electronic components. The mechanical movement of the mechanical structure drives the electronic components to generate signal changes. After the signal is processed, the diopter value is projected on the display screen of the head-mounted display for display. However, there are errors in the mechanical structure, electronic components, and signal reading, which makes it impossible to guarantee the accuracy of the diopter digital display, affecting the experience of the head-mounted display. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method and system for digitally displaying the diopter of a head-mounted display and a head-mounted display in view of the above-mentioned defects of the prior art.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A method for digitally displaying diopter of a head mounted display is constructed, comprising the following steps:

[0008] A cam structure is used to adjust the relative distance between the display component and the optical component of the head mounted display, and the sliding part of the sliding rheostat is driven to move during the adjustment;

[0009] A mapping relationship between a preset diopter value and a change amount of the sliding rheostat;

[0010] According to the mapping relationship, converting the change amount into a corresponding diopter value signal;

[0011] The display component displays the diopter value according to the diopter value signal.

[0012] Furthermore, the step of converting the variation into a diopter value signal according to the mapping relationship specifically includes:

[0013] Calculating the average change of the sliding rheostat at the current scale;

[0014] The rotation direction of the cam structure is determined, and according to the mapping relationship, the average change amount is converted into a diopter numerical signal and output to the display component.

[0015] Furthermore, the step of calculating the average change of the sliding rheostat at the current scale specifically includes:

[0016] Read the analog voltage value of the sliding rheostat at the current scale multiple times and convert it into a digital value;

[0017] Calculates the average change from multiple digital quantities.

[0018] Furthermore, the step of determining the rotation direction of the cam structure specifically includes:

[0019] Compare the current average change with the previous change;

[0020] If the current average variation increases, the rotation direction of the cam structure is clockwise;

[0021] If the current average variation decreases, the rotation direction of the cam structure is counterclockwise.

[0022] Furthermore, the step of presetting the mapping relationship between the diopter value and the change amount of the sliding rheostat specifically includes:

[0023] Setting the diopter value that changes each time the cam structure rotates one scale;

[0024] Reading and saving a first change amount of the sliding rheostat when the cam structure rotates one scale clockwise;

[0025] Reading and saving a second variation of the sliding rheostat when the cam structure rotates counterclockwise by one scale;

[0026] A mapping relationship between the diopter value and the change amount of the sliding resistor is set according to the diopter value, the first change amount and the second change amount.

[0027] Furthermore, the method further comprises the steps of:

[0028] Set the number of times the analog voltage value of the sliding resistor is read at the current scale.

[0029] Furthermore, the number of readings is set to n, and the value range of n satisfies the following relationship (1):

[0030] 80 ≤ n ≤ 200 (1).

[0031] Furthermore, the diopter value of the cam structure changes by 50° each time it rotates one scale.

[0032] The present invention provides a diopter digital display system for a head mounted display, comprising:

[0033] Display components and optical components of head-mounted displays;

[0034] A cam structure, used for adjusting the relative distance between the display assembly and the optical assembly;

[0035] A sliding rheostat, wherein the sliding portion of the sliding rheostat is driven to move by the cam structure;

[0036] a correction module, used for presetting a mapping relationship between a diopter value and a change amount of the sliding rheostat; and

[0037] The calculation module is used to convert the change amount into a diopter value signal according to the mapping relationship.

[0038] Furthermore, it also includes:

[0039] A reading module, used for reading the analog voltage value of the sliding rheostat; and

[0040] The ADC conversion module is used to convert the analog voltage value into a digital value.

[0041] Furthermore, it also includes:

[0042] The output module is used to output the diopter value signal to the display component.

[0043] The present invention provides a head mounted display, comprising a diopter digital display system of the head mounted display as described in any one of the above.

[0044] The beneficial effects of the present invention are as follows: the present application presets a mapping relationship between a diopter value and a change amount of a sliding rheostat. When a cam structure is used to adjust the relative distance between a display component and an optical component of a head mounted display, the cam structure drives the sliding part of the sliding rheostat to move, and the sliding rheostat produces a change amount. According to the mapping relationship, a diopter value signal corresponding to the change amount is calculated, and the display component displays the diopter value according to the diopter value signal. This can avoid the errors existing in the cam structure, the sliding rheostat, the main control component and other components from affecting the adjustment accuracy of the diopter, and control the accuracy error of the diopter digital display within the range of ±25°. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work:

[0046] Figure 1 is a flowchart of a diopter digital display method of a head mounted display according to Embodiment 1 of the present invention;

[0047] Figure 2 is a flowchart of the diopter value correction of the left and right eyes in the first embodiment of the present invention;

[0048] Figure 3 is a flowchart of generating a diopter value signal according to the first embodiment of the present invention;

[0049] Figure 4 is a flowchart of calculating the average change value according to the first embodiment of the present invention;

[0050] Figure 5 is a structural schematic diagram of a cam structure according to a first embodiment of the present invention;

[0051] Figure 6 is a principle block diagram of a diopter digital display system of a head mounted display in a fourth embodiment of the present invention;

[0052] Figure 7 FIG. 1 is a schematic diagram of a partial structure of a head mounted display according to an embodiment of the present invention. Figure 1 ;

[0053] Figure 8 The embodiment of the present invention Figure 7 The enlarged schematic diagram of point A in the middle;

[0054] Fig. 9 FIG. 1 is a schematic diagram of a partial structure of a head mounted display according to an embodiment of the present invention. Figure 2 .

[0055] In the figure, 1. MCU component; 2. button; 3. sliding rheostat; 5. display component; 6. optical component; 7. head-mounted display mainboard; 11. correction module; 12. reading module; 13. calculation module; 14. output module; 41. driving cam; 42. knob; 43. mounting bracket; 44. transmission slider; 45. steel ball; 46. spring; 47. cam driving handle; 411. arc adjustment groove; 412. groove; 441. card slot. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be described clearly and completely in combination with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are partial embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0057] Embodiment 1

[0058] Embodiment 1 of the present invention provides a method for digitally displaying diopter of a head mounted display, combining Figure 1 It can be obtained, including the following steps:

[0059] S100: using a cam structure to adjust the relative distance between the display component and the optical component of the head mounted display, and driving the sliding part of the sliding rheostat to move during the adjustment process;

[0060] S200: Preset the mapping relationship between the diopter value and the change amount of the sliding rheostat;

[0061] S300: converting the change amount into a corresponding diopter value signal according to the mapping relationship;

[0062] S400: The display component displays the diopter value according to the diopter value signal.

[0063] The cam structure is connected to the display assembly of the head mounted display and is used to drive the display assembly to move toward or away from the optical assembly to adjust the relative distance between the display assembly and the optical assembly. In the process of adjusting the position of the display assembly, the cam structure will also drive the sliding part of the sliding rheostat to move, thereby changing the analog voltage value at both ends of the sliding rheostat and generating a change. According to the mapping relationship, the change is converted into a corresponding diopter numerical signal and sent to the display assembly, which displays the diopter value on the display screen according to the diopter numerical signal.

[0064] This application uses the movement change of the mechanical structure to realize the feedback of the electronic signal. By presetting the mapping relationship between the diopter value and the change amount of the sliding rheostat, the diopter value is determined to realize the diopter digital display. It can avoid the error of the cam structure, sliding rheostat and main control components affecting the adjustment accuracy of the diopter, and control the accuracy error of the diopter digital display within the range of ±25°. This is the difference between the technical solution of this application and the accuracy guarantee of common digital signals such as "sound" and "brightness" in other head-mounted display products.

[0065] In the above embodiment, the precision error of the diopter digital display is controlled within the range of ±25°, because the mechanical coordination of the cam structure, the displacement of the sliding rheostat, and the reading of the main control component will all produce errors. For example, the diopter is adjusted to myopia 200°, and this myopia 200° is only the display adjustment of the scale of the cam structure, and the actual diopter may be 180°, 220°, etc.; the diopter is adjusted to myopia 250°, and the actual diopter may be 260°, 240°, etc.

[0066] In a further embodiment, the step of converting the variation into a diopter numerical signal according to the mapping relationship specifically includes:

[0067] Calculate the average change of the sliding rheostat at the current scale;

[0068] The rotation direction of the cam structure is determined, and according to the mapping relationship, the average change is converted into a diopter numerical signal and output to the display component.

[0069] The average change is calculated because errors are also generated in the process of reading the sliding rheostat. Therefore, it is necessary to find the average change of the sliding rheostat at the current scale to reduce this error. The rotation direction of the cam structure is judged based on the average change. This is because each part in the cam structure has a gap at the connection. When the cam structure rotates in different directions, this gap has a greater impact on the judgment of the diopter accuracy. Therefore, after calculating the average change, the rotation direction of the cam structure needs to be identified to avoid errors in the structure. According to the average change and the rotation direction of the cam structure, the current diopter is determined, and a diopter numerical signal is generated and output to the display component. The display component displays the diopter value on the display screen based on the diopter numerical signal.

[0070] In a further embodiment, the step of calculating the average change of the sliding rheostat at the current scale specifically includes:

[0071] Read the analog voltage value of the sliding rheostat at the current scale multiple times and convert it into digital value;

[0072] Calculates the average change from multiple digital quantities.

[0073] Specifically, after the signal change of the sliding rheostat is identified, the analog voltage value of the sliding rheostat at the current scale is read multiple times. During the multiple readings, the cam structure always remains at the current scale and does not allow scale jumps. The analog voltage value of the sliding rheostat is read. After reading, the analog voltage value needs to be converted to an AD, that is, an analog-to-digital conversion, to convert the analog voltage value into a digital quantity. Based on the multiple digital quantities read, the average change of the sliding rheostat at the current scale is calculated, which can reduce the error generated in reading the sliding rheostat value, reduce the impact on the adjustment accuracy of the diopter, and control the accuracy error of the diopter digital display within the range of ±25°.

[0074] In a further embodiment, the step of determining the rotation direction of the cam structure specifically includes:

[0075] Compare the current average change with the previous change;

[0076] If the current average change increases, the rotation direction of the cam structure is clockwise;

[0077] If the current average change decreases, the rotation direction of the cam structure is counterclockwise.

[0078] When the cam structure rotates from the previous diopter scale to the current diopter scale, the rotation direction of the cam structure needs to be determined by the average change of the sliding rheostat. If the current average change is greater than the change of the previous diopter, the cam structure rotates clockwise; if the current average change is less than the change of the previous diopter, the cam structure rotates counterclockwise. The rotation direction of the cam structure needs to be determined mainly because each part of the cam structure has a gap at the connection. This gap has a greater impact on the judgment of the diopter accuracy when the cam structure rotates in different directions. Therefore, after calculating the average change, the rotation direction of the cam structure needs to be identified to avoid errors in the structure.

[0079] In a further embodiment, the step of presetting the mapping relationship between the diopter value and the change amount of the sliding rheostat specifically includes:

[0080] Set the diopter value that changes every time the cam structure rotates one scale;

[0081] Read and save the first change amount of the sliding rheostat when the cam structure rotates one scale clockwise;

[0082] Read and save the second change amount of the sliding rheostat when the cam structure rotates one scale counterclockwise;

[0083] A mapping relationship between the diopter value and the change amount of the sliding resistor is set according to the diopter value, the first change amount and the second change amount.

[0084] There are two groups of mapping relationships, corresponding to the diopter of the left and right eyes respectively. Setting the mapping relationship between the diopter value and the change of the sliding rheostat is essentially to correct the diopter of the left and right eyes of the head-mounted display. This is because there will be errors in the movement of the cam structure of each head-mounted display, the movement of the sliding rheostat, data reading, etc. By setting the mapping relationship, the diopter of the left and right eyes of the head-mounted display is corrected to ensure the accuracy of the diopter digital display, and the accuracy error of the diopter digital display is controlled within the range of ±25°.

[0085] Specifically, Figure 2 As shown, the diopter value that changes when the cam structure rotates one scale clockwise or counterclockwise is set. This diopter value is the display adjustment of the scale of the cam structure. For example, the scale of the cam structure is +2 to -7, where +2 refers to 200 degrees of hyperopia and -7 refers to 700 degrees of myopia. When the cam structure is adjusted from +2 to +1, although the current diopter value is 100° of hyperopia, the actual diopter is not 100°, but is within the range of 100°±25°.

[0086] In the correction mode, the cam structure rotates in a clockwise direction (+2 to -7). Each time it rotates one scale, the first change of the sliding resistor at the diopter scale is read and saved by pressing a button on the head-mounted display.

[0087] The implementation code of this step is as follows:

[0088]

[0089] After the first changes corresponding to all clockwise scales are saved, the cam structure rotates in the counterclockwise direction (-7 to +2). Every time it rotates one scale, the second change of the sliding resistor at the diopter scale is read and saved by pressing a button on the head-mounted display.

[0090] The implementation code of this step is as follows:

[0091]

[0092] When the second variation corresponding to all the scales in the clockwise direction are saved, the diopter correction of the single eye is completed.

[0093] The implementation code of ADC reading storage part is as follows:

[0094]

[0095]

[0096] The diopter of the other eye is corrected in the same manner, and the corrected first variation, second variation and set diopter value are all stored in the storage area of ​​the column hole assembly.

[0097] During the calibration process, the left eye is usually calibrated first, and then the right eye. When the diopter calibration of the left and right eyes is completed, the main control component will save the reference data of the left and right eyes in both directions of each scale. The first change amount and the second change amount are both digital values ​​converted from the analog voltage value of the sliding resistor.

[0098] In a further embodiment, Figure 4 As shown, the steps include:

[0099] Set the number of times the analog voltage value of the sliding resistor is read at the current scale.

[0100] When the cam structure rotates one scale, the analog voltage value of the sliding resistor at the current scale is read multiple times. When the number of readings reaches the set number, the reading of the analog voltage value of the sliding resistor is stopped, and the average change of the sliding resistor at the current scale is calculated based on the multiple changes.

[0101] In a further embodiment, the number of reads is set to n, and the value range of n satisfies the following relationship (1):

[0102] 80 ≤ n ≤ 200 (1).

[0103] The number of times of reading the real-time change value of the sliding rheostat at the same scale depends on actual needs, and can be 80 times, 90 times, 100 times, 115 times, 130 times, 150 times, 200 times, etc. The calculation of the average change is similar to normal distribution sampling. The more samples are taken, the longer the time is, and the more accurate the result is. In this embodiment, the number is 100 times.

[0104] When the number of times the real-time change of the sliding resistor at the current scale is read reaches 100 times, stop reading, and calculate the average change of the sliding resistor at the current scale based on these 100 real-time changes. Compare this average change with the average change of the previous scale to determine the rotation direction of the cam structure. According to the rotation direction of the cam structure and the mapping relationship, convert the current average change into a refractive index signal and output it. The display component displays the refractive index value based on the refractive index signal.

[0105] In a further embodiment, the diopter value that changes each time the cam structure rotates one scale is 50°.

[0106] The diopter display of the scale corresponding to each rotation of the cam structure is adjusted to 50 degrees. For example, the scale of the cam structure is set to +2 to -7, where +2 refers to 200 degrees of hyperopia and -7 refers to 700 degrees of myopia. When the cam structure is adjusted from +2 to +1, the cam structure rotates through two scales.

[0107] In the above embodiment, if Figure 3 As shown, after determining the rotation direction of the cam structure, the mapping relationship corresponding to the corresponding eye and the rotation direction is searched, and the diopter value corresponding to the average change of the sliding rheostat at the current scale is found in these mapping relationships, and the interval range of the average change is determined. After determining the current diopter, a diopter value signal is generated.

[0108] The code for the diopter numerical processing is as follows:

[0109]

[0110]

[0111] In the above embodiment, if Figure 5 As shown, the cam structure includes a driving cam 41, a knob 42 connected to the driving cam 41, a mounting bracket 43 for mounting the driving cam 41, a transmission slider 44, a steel ball 45 arranged in the mounting bracket 43, and a spring 46 pressed by the steel ball 45. Specifically, a clamping groove 441 is provided on the transmission slider 44, and the sliding part of the sliding rheostat 3 is clamped in the clamping groove 441 and moves together with the transmission slider 44. An arc-shaped adjustment groove 411 is provided on the driving cam 41, and a cam driving handle 47 is provided on the transmission slider 44. By utilizing the cooperation between the cam driving handle 47 and the arc-shaped adjustment groove 411, when the knob 42 drives the driving cam 41 to rotate, the cam driving handle 47 moves along the arc-shaped adjustment groove 411, drives the transmission slider 44 to perform linear reciprocating movement, and then drives the sliding part of the sliding rheostat 3 to move, so that the voltage at both ends of the sliding rheostat 3 changes. A plurality of grooves 412 are provided on the surface of the driving cam 41 , and the number of the grooves 412 is the same as the number of the set scales. When the driving cam 41 is adjusted to a scale, the steel ball 45 will be stuck in the groove 412 under the action of the spring 46 .

[0112] Embodiment 2

[0113] Embodiment 2 provides a diopter digital display method for a head mounted display. The diopter digital display method uses a cam structure to adjust the relative distance between a display component and an optical component of the head mounted display, and drives a sliding part of a sliding resistor to move during the adjustment process.

[0114] Among them, the difference from the first embodiment is that the cam structure in the second embodiment drives the optical component to move toward or away from the display component to adjust the relative distance between the display component and the optical component, and drives the sliding part of the sliding rheostat to move during the adjustment process. The present application utilizes the movement change of the mechanical structure to realize the feedback of the electronic signal, and determines the diopter value by presetting the mapping relationship between the diopter value and the change amount of the sliding rheostat to realize the diopter digital display, which can avoid the errors existing in the cam structure, sliding rheostat and main control component affecting the adjustment accuracy of the diopter, and control the accuracy error of the diopter digital display within the range of ±25°. This is the difference between the technical solution of the present application and the accuracy assurance of common digital signals such as "sound" and "brightness" in other head-mounted display products.

[0115] Embodiment 3

[0116] Embodiment 3 provides a diopter digital display method for a head mounted display. The diopter digital display method uses a cam structure to adjust the relative distance between a display component and an optical component of the head mounted display, and drives a sliding part of a sliding rheostat to move during the adjustment process.

[0117] Among them, the difference from the first embodiment is that the cam structure in the third embodiment drives the movement of the optical lens in the optical assembly, that is, internal zoom, so as to realize the diopter adjustment of the head-mounted display, and drives the sliding part of the sliding rheostat to move during the adjustment process. The present application utilizes the movement change of the mechanical structure to realize the feedback of the electronic signal, and determines the diopter value by the mapping relationship between the preset diopter value and the change amount of the sliding rheostat to realize the diopter digital display, which can avoid the errors existing in the cam structure, sliding rheostat and main control assembly and other components affecting the adjustment accuracy of the diopter, and control the accuracy error of the diopter digital display within the range of ±25°. This is the difference between the technical solution of the present application and the accuracy assurance of common digital signals such as "sound" and "brightness" in other head-mounted display products.

[0118] Embodiment 4

[0119] Embodiment 4 of the present invention provides a diopter digital display system for a head mounted display, such as Figure 6 As shown, including:

[0120] A display component 5 and an optical component 6 of a head mounted display;

[0121] A cam structure, used to adjust the relative distance between the display component 5 and the optical component 6;

[0122] A sliding rheostat 3, wherein the sliding part of the sliding rheostat 3 is driven to move by a cam structure;

[0123] A correction module 11, used for presetting a mapping relationship between a diopter value and a change amount of a sliding rheostat; and

[0124] The calculation module 13 is used to convert the change amount into a diopter value signal according to the mapping relationship.

[0125] Furthermore, it also includes:

[0126] A reading module 12, used to read the analog voltage value of the sliding resistor; and

[0127] The ADC conversion module is used to convert analog voltage values ​​into digital quantities; the ADC conversion module is an analog-to-digital conversion module.

[0128] Furthermore, it also includes:

[0129] The output module 14 is used to output the diopter value signal to the display component.

[0130] Specifically, the correction module 11, the calculation module 13, the reading module 12, the output module 14 and the ADC conversion module constitute a control element, namely, the MCU element 1. The correction module 11 of the MCU element 1 stores the mapping relationship between two sets of preset diopter values ​​for the left and right eyes and the change amount of the sliding rheostat.

[0131] The cam structure is used to adjust the relative distance between the display component and the optical component to adjust the diopter of the head mounted display, and in the process of adjusting the diopter, the sliding part of the sliding resistor 3 will be driven by the cam structure to move, generating a signal change.

[0132] When the sliding rheostat 3 generates a signal change, the reading module 12 reads the analog voltage value of the sliding rheostat 3, and converts the analog voltage value into a digital value through the ADC conversion module, that is, the change amount of the sliding rheostat 3. The reading module 12 reads the change amount of the sliding rheostat 3 at the current scale for multiple times. When the number of readings by the reading module 12 reaches a preset number, the reading stops, and the calculation module 13 calculates the average change amount from the multiple changes read, and determines the rotation direction of the cam structure according to the average change amount. According to the rotation direction of the cam structure and the mapping relationship, the average change amount is converted into a diopter numerical signal, and the output module 14 transmits the diopter numerical signal to the display driving module 52 of the display component 5, so that the corresponding diopter value is displayed on the display screen 51.

[0133] This application uses the movement change of the mechanical structure to realize the feedback of the electronic signal. By presetting the mapping relationship between the diopter value and the change amount of the sliding rheostat and calculating the average change amount, the diopter value is determined to realize the diopter digital display. It can avoid the error of the cam structure, sliding rheostat and main control components affecting the adjustment accuracy of the diopter, and control the accuracy error of the diopter digital display within the range of ±25°. This is the difference between the technical solution of this application and the accuracy guarantee of common digital signals such as "sound" and "brightness" in other head-mounted display products.

[0134] Embodiment 5

[0135] A fifth embodiment of the present invention provides a head mounted display, such as Figures 7 to 9 As shown, a diopter digital display system including a head-mounted display as described in any of the above items.

[0136] The head-mounted display includes a head-mounted part and a main body, wherein the main body includes a head-mounted display mainboard 7, a display component 5, an optical component 6, a cam structure, a sliding rheostat 3 and an MCU component 1. The MCU component 1 and the sliding rheostat 3 are both arranged on the head-mounted display mainboard 7 of the head-mounted display. The feedback of the electronic signal is realized by using the movement change of the mechanical structure, and the mapping relationship between the preset diopter value and the change amount of the sliding rheostat and the average change amount is obtained to determine the diopter value, and realize the diopter digital display. It can avoid the errors existing in the cam structure, the sliding rheostat and the main control component and other components from affecting the adjustment accuracy of the diopter, and control the accuracy error of the diopter digital display within the range of ±25°. This is the difference between the technical solution of the present application and the accuracy assurance of common digital signals such as "sound" and "brightness" in other head-mounted display products.

[0137] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A method for digitally displaying diopter of a head mounted display, characterized in that: The following steps are involved: A cam structure is used to adjust the relative distance between the display component and the optical component of the head mounted display, and the sliding part of the sliding rheostat is driven to move during the adjustment; Calculate the average change of the sliding rheostat at the current scale, determine the rotation direction of the cam structure according to the average change, and compare the current average change with the previous change; if the current average change increases, the rotation direction of the cam structure is clockwise; if the current average change decreases, the rotation direction of the cam structure is counterclockwise; Set the diopter value that changes every time the cam structure rotates one scale; Read and save the first change amount of the sliding rheostat when the cam structure rotates one scale clockwise; Read and save the second change amount of the sliding rheostat when the cam structure rotates one scale counterclockwise; According to the diopter value, the first change amount and the second change amount, a mapping relationship between the diopter value and the change amount of the sliding rheostat is set, wherein the mapping relationship has two groups, corresponding to the diopter of the left eye and the right eye respectively; According to the mapping relationship, converting the average change amount into a diopter numerical signal and outputting the signal to the display component; The display component displays the diopter value according to the diopter value signal; The step of calculating the average change of the sliding rheostat at the current scale specifically includes: Read the analog voltage value of the sliding rheostat at the current scale multiple times and convert it into a digital value; Calculate average change based on multiple digital quantities; Also includes the steps: The number of times the analog voltage value of the sliding rheostat is read at the current scale is set; the number of times read is set to n, and the value range of n satisfies the following relationship (1): 80 ≤ n ≤ 200 (1)。 2. The method for digitally displaying diopter of a head mounted display according to claim 1, characterized in that: The diopter value of the cam structure changes by 50° each time it rotates one scale.

3. A diopter digital display system for a head mounted display, characterized in that: include: Display components and optical components of head-mounted displays; A cam structure, used for adjusting the relative distance between the display assembly and the optical assembly; A sliding rheostat, wherein the sliding portion of the sliding rheostat is driven to move by the cam structure; A correction module, used for presetting a mapping relationship between a diopter value and a change amount of the sliding rheostat; as well as, A calculation module, used for calculating the average change of the sliding rheostat at the current scale, judging the rotation direction of the cam structure according to the average change, and comparing the current average change with the previous change; if the current average change increases, the rotation direction of the cam structure is clockwise; if the current average change decreases, the rotation direction of the cam structure is counterclockwise; Setting cam The diopter value that changes every time the structure rotates one scale; Read and save the first change amount of the sliding rheostat when the cam structure rotates one scale clockwise; Read and save the second change amount of the sliding rheostat when the cam structure rotates one scale counterclockwise; According to the diopter value, the first change amount and the second change amount, a mapping relationship between the diopter value and the change amount of the sliding rheostat is set, wherein the mapping relationship has two groups, corresponding to the diopter of the left eye and the right eye respectively; According to the mapping relationship, the average change amount is converted into a diopter value signal and output to the display component; and further comprising: A reading module, used for reading the analog voltage value of the sliding rheostat; and An ADC conversion module, used to convert the analog voltage value into a digital value; and further comprising: The output module is used to output the diopter value signal to the display component.

4. A head mounted display, characterized in that: A diopter digital display system comprising the head mounted display as claimed in claim 3.

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