Far image display device and control method thereof

Abstract

The invention belongs to the field of display devices, and discloses a far image display device and a control method thereof. The far image display device comprises a shell, a control assembly, a first image display unit, a second image display unit, a display panel, a light emitting panel and a reflecting part. The first image display unit is used for emitting first polarized light in a first polarization direction, and at least part of the first polarized light penetrates through the light emitting panel and enters the display panel; the second image display unit is used for emitting second polarized light in a second polarization direction, the second polarized light is reflected by the light emitting panel and then enters the display panel, and the first polarized light and the second polarized light are reflected by the display panel, then enter the reflecting part, and are reflected by the reflecting part and then penetrate through the display panel to be emitted; and the control assembly is used for controlling the first image display unit and the second image display unit to alternately emit light, so that two images with different distances can be alternately observed from the light emitting surface of the display panel. The vision correction device has the advantages that vision can be corrected through switching of the far image and the near image, and operation is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of display devices, and in particular to a telescopic image display device and a control method thereof. Background Art

[0002] The retinal imaging and focusing function required by the eye for objects at different distances is achieved through the contraction and relaxation of the ciliary muscle. For people who are prone to myopia, the ciliary muscle has insufficient regulatory power and is unable to contract and relax, leading to myopia.

[0003] At present, when preventing myopia, the ciliary muscles are often stretched and contracted by switching between observing near and far images, and the ciliary muscles are trained to improve the visual accommodation reserve and the image fusion reserve. In the related art, a double-sided mirror flip camera is used to train and improve the visual accommodation reserve and the image fusion reserve. The double-sided mirror flip camera consists of a convex mirror and a concave mirror. By switching back and forth, the ciliary muscles can be stretched and contracted to exercise the ability to see near and far. However, this method requires manual switching back and forth, which is not only laborious for children to see, but also time-consuming and energy-consuming for parents to flip, and the switching frequency and timing cannot be effectively controlled, which is very inconvenient to use. Summary of the invention

[0004] The main purpose of the present invention is to provide a telescopic image display device and a control method thereof, aiming to solve the technical problem that the related art is inconvenient for vision adjustment training.

[0005] To achieve the above object, according to one aspect of the present invention, the present invention provides a telescopic image display device, comprising a housing, a control component, a first image display unit, a second image display unit, a display panel, a light emitting panel and a reflector, wherein a receiving cavity and an opening communicating with the receiving cavity are formed in the housing, and the display panel is installed in the opening; the first image display unit, the second image display unit, the light emitting panel and the reflector are all arranged in the receiving cavity;

[0006] The first image display unit is used to emit a first polarized light in a first polarization direction and at least partially pass through the light emitting panel to be incident on the display panel; the second image display unit is used to emit a second polarized light in a second polarization direction and reflect from the light emitting panel to be incident on the display panel, the first polarized light and the second polarized light are reflected from the display panel and are incident on the reflector, and are reflected from the reflector and then emitted through the display panel;

[0007] The control component is used to control the first image display unit and the second image display unit to emit light alternately, so that two images at different distances can be alternately observed from the light emitting surface of the display panel.

[0008] In some embodiments, the path through which the first polarized light propagates from the first image display unit to the reflective concave surface of the reflector is defined as a first light path, and the path through which the second polarized light propagates from the second image display unit to the reflective concave surface of the reflector is defined as a second light path; then:

[0009] A path length of the first light path is different from a path length of the second light path.

[0010] In some embodiments, the light emitting panel includes a front side and a back side, and the front side is arranged facing the display panel;

[0011] The first light path includes a first incident segment emitted from the first image display unit and incident on the front side through the back side; the second light path includes a second incident segment emitted from the second image display unit and incident on the front side;

[0012] The path length of the first incident segment is different from the path length of the second incident segment.

[0013] In some embodiments, the light output panel includes a reflective polarizer, which can transmit most of the first polarized light and reflect most of the second polarized light; and the display panel includes a semi-transmissive and semi-reflective layer.

[0014] In some embodiments, the first image display unit includes a first display screen and a first polarizer, the second image display unit includes a second display screen and a second polarizer, the polarization direction of the first polarizer is perpendicular to the polarization direction of the second polarizer, and the first polarization direction of the first polarized light and the second polarization direction of the second polarized light are perpendicular to each other.

[0015] In some embodiments, an adjustment lens and an adjustment assembly are also provided in the accommodating cavity, and the adjustment assembly includes a driving member, a driving screw connected to the driving member, and a driving screw sleeve mounted on the driving screw. The telephoto display device also includes a limiting assembly, and the limiting assembly includes a limiting slide rod installed on the outer shell and a limiting slide sleeve slidably installed on the limiting slide rod. The two ends of the adjustment lens are respectively installed on the limiting slide sleeve and the driving screw sleeve.

[0016] In some embodiments, a mounting frame is further disposed in the accommodating cavity, the mounting frame, the light emitting panel and the first image display unit are surrounded to form an inner cavity, and a light absorbing layer is disposed on a side of the mounting frame facing the inner cavity; and / or,

[0017] The housing is provided with a light shield facing the light emitting surface; and / or,

[0018] The first image display unit and the second image display unit are located on top of the display panel.

[0019] According to another aspect of the present invention, the present invention further provides a control method for a telescopic image display device, which is used to control the telescopic image display device according to the above-mentioned method, and the control method for the telescopic image display device comprises the following steps:

[0020] Acquire training parameters; wherein the training parameters include the luminous frequency and the ghosting time of the luminous light of the first image display unit and the second image display unit;

[0021] The first image display unit and the second image display unit are controlled to emit light alternately according to the training parameters.

[0022] In some embodiments, the ghosting time includes at least one of the following:

[0023] The ghosting time is greater than 0; or,

[0024] The ghosting time is equal to 0; or,

[0025] The ghosting time is less than 0; wherein, when the ghosting time is less than 0, the ghosting time represents a time interval during which the first image display unit and the second image display unit do not emit light at the same time.

[0026] In some embodiments, the training parameters further include image position information, and after the step of acquiring the training parameters and before the step of controlling the first image display unit and the second image display unit to alternately emit light according to the training parameters, the following steps are further included:

[0027] According to the image position information, obtaining a target position of the adjustment lens;

[0028] The control adjustment component drives the adjustment lens to move to the target position.

[0029] The present invention provides a telescopic image display device, which can realize automatic near and far adjustment of images seen by human eyes by switching the alternating switching of the first image display unit and the second image display unit through the control component, and stretch and contract the ciliary muscle by switching the way of observing near and far images, and train the ciliary muscle to improve the visual adjustment reserve and the far fusion reserve. This embodiment replaces the technical solution of manually flipping the double-sided mirror flip shot in the related art, improves the convenience of operation, and can effectively control the switching frequency and timing. In addition, the scheme of switching near and far is applied to the telescopic image display device, and correction can be performed when training is not possible. For example, the double-sided mirror flip shot used in the related art is generally corrected by comparing with the eye chart, and the training process is very boring, especially for children, long-term training is unacceptable. However, this embodiment can change the content played by the first image display unit and the second image display unit to cartoons or conscious educational films needed by children, and the setting can be applied to the learning machine commonly used by children. The purpose of vision correction is achieved through normal learning and entertainment, and the vision correction training will not bring too much extra burden to parents and children. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic structural diagram of a telescopic image display device according to an embodiment of the present invention;

[0031] Figure 2 It is a partial structural schematic diagram of a telescopic image display device according to an embodiment of the present invention;

[0032] Figure 3 Another schematic structural diagram of a telescopic image display device according to an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of an adjustment component, a limit component and an adjustment lens of a telescopic image display device according to an embodiment of the present invention;

[0034] Figure 5 This is a schematic structural diagram of a reflector and a control circuit layer of a telescopic display device according to an embodiment of the present invention;

[0035] Figure 6 It is a structural schematic diagram of a second image display unit, a second sliding frame and a part of the housing of a telescopic image display device according to an embodiment of the present invention;

[0036] Figure 7 It is another structural schematic diagram of a telescopic image display device according to an embodiment of the present invention;

[0037] Figure 8 1 is a flow chart of a control method of a telescopic image display device according to a first embodiment of the present invention;

[0038] Fig. 9A schematic diagram of the opening timing of the first image display unit and the second image display unit of the control method of the telescopic image display device of the present invention;

[0039] Fig.10 Another schematic diagram of the opening timing of the first image display unit and the second image display unit of the control method of the telescopic image display device of the present invention;

[0040] Fig.11 Another schematic diagram of the opening timing of the first image display unit and the second image display unit of the control method of the telescopic image display device of the present invention;

[0041] Fig.12 FIG. 4 is a flow chart of a control method of a telescopic image display device according to a second embodiment of the present invention.

[0042] Description of Figure Numbers:

[0043] 100. Telescopic image display device; 1. Casing; 2. Accommodating cavity; 3. Display panel; 31. Light emitting surface; 4. First image display unit; 41. First display screen; 42. First polarizer; 5. Second image display unit; 51. Second display screen; 52. Second polarizer; 6. Light emitting panel; 7. Reflector; 71. Support area; 72. Reflector area; 8. Adjustment assembly; 81. Drive member; 82. Drive screw; 83. Drive screw sleeve; 9. Limit assembly; 91. Limit slide rod; 92. Limit slide sleeve; 10. Adjustment lens; 11. Mounting frame; 12. Light absorbing layer; 13. Second notch; 14. Second sliding frame; 15. Second charging interface; 16. Control assembly; 17. Control circuit layer; 18. Inner cavity; 19. Touch layer.

[0044] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0047] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] At present, when preventing myopia, the ciliary muscles are often stretched and contracted by switching between observing near and far images, and the ciliary muscles are trained to improve the visual accommodation reserve and the image fusion reserve. In the related art, a double-sided mirror flip camera is used to train and improve the visual accommodation reserve and the image fusion reserve. The double-sided mirror flip camera is composed of a convex mirror and a concave mirror. By switching back and forth, the ciliary muscles can be stretched and contracted to exercise the ability to see near and far. However, this method requires manual switching back and forth, which is not only laborious for children to see, but also time and energy for parents to flip, and the switching frequency and timing cannot be effectively controlled; furthermore, especially when used in cold weather, it is easy for the user to form water mist on the lens when breathing and reading the card, which is very inconvenient to use. In general, children use a double-sided mirror flip camera to observe the eye chart, and the training process is also relatively boring and difficult to persist for a long time.

[0049] Reference Figure 1 and Figure 2 According to one aspect of the present invention, a telescopic image display device 100 is provided, comprising a housing 1, a control assembly 16, a first image display unit 4, a second image display unit 5, a display panel 3, a light emitting panel 6 and a reflector 7. A housing 1 is formed with a receiving cavity 2 and an opening communicating with the receiving cavity 2, and the display panel 3 is installed in the opening; the first image display unit 4, the second image display unit 5, the light emitting panel 6 and the reflector 7 are all arranged in the receiving cavity 2;

[0050] The first image display unit 4 is used to emit a first polarized light in a first polarization direction and at least partially pass through the light emitting panel 6 to be incident on the display panel 3; the second image display unit 5 is used to emit a second polarized light in a second polarization direction and reflect from the light emitting panel 6 to be incident on the display panel 3, the first polarized light and the second polarized light are reflected from the display panel 3 and are incident on the reflector 7, and are reflected from the reflector 7 and then emitted from the display panel 3;

[0051] The control component 16 is used to control the first image display unit 4 and the second image display unit 5 to emit light alternately, so that two images at different distances can be alternately observed from the light emitting surface 31 of the display panel 3 .

[0052] It should be noted that the display panel 3 can reflect part of the light and transmit another part of the light, and has a semi-reflective and semi-transparent property. The light output panel 6 can also reflect part of the light and transmit another part of the light, and has a semi-reflective and semi-transparent property. In a specific embodiment, the display panel 3 can be a semi-transparent and semi-reflective plate. The first image display unit 4 and the second image display unit 5 are used to generate an image, and the image information is emitted in the form of light. In the above embodiment, the first polarized light of the first polarization direction emitted from the first image display unit 4 (such as can be Figure 1 The S polarized light represented by E in the figure) can at least partially pass through the light emitting panel 6 and be emitted from the light emitting panel 6 to the display panel 3, and the second polarized light of the second polarization direction emitted from the second image display unit 5 (such as can be Figure 1 The P polarized light represented by F in the figure can be at least partially reflected by the light emitting panel 6 and then incident on the display panel 3, wherein the first polarization direction and the second polarization direction are different. At this time, the first polarized light and the second polarized light merge to form a light beam that is emitted to the display panel 3 and is reflected by the display panel 3 to the reflector 7. After being reflected by the reflector 7, the incident angle changes, and the formed light beam passes through the display panel 3 and is received by the human eye. The position of the human eye is as shown in FIG. Figure 1 As shown in A. The incident angle here refers to the incident angle of the light beam relative to the display panel 3. It should be noted that the fusion in the present invention means that the propagation paths of the two polarized light rays are the same, not that they are combined into one light ray. The first polarized light ray and the second polarized light ray are still propagated independently of each other, but the propagation paths of the fused light rays are highly overlapped.

[0053] The control component 16 is used to control the first image display unit 4 and the second image display unit 5 to emit light alternately. The alternate light emission here may include at least the following three situations: Fig. 9 , the first case is that the first image display unit 4 and the second image display unit 5 emit light alternately and have a certain time interval, that is, there is a time interval in which both the first image display unit 4 and the second image display unit 5 do not emit light; Fig. 9 In the first case, the first image display unit 4 and the second image display unit 5 are illuminated alternately and have a certain ghosting time, that is, the second image display unit 5 is illuminated when the first image display unit 4 is not turned off, or the first image display unit 4 is illuminated when the second image display unit 5 is not turned off; Fig.10In the second case, the luminous time of the first image display unit 4 and the second image display unit 5 is seamlessly connected, with neither ghosting time nor time interval; Fig.11 , the third situation is that the first image display unit 4 and the second image display unit 5 emit light alternately with a certain time interval.

[0054] Reference Figure 1 , where the human eye position is Figure 1 As shown in A, the location of the virtual image is Figure 1 When the control component 16 controls the first image display unit 4 to turn on and the second image display unit 5 to turn off, at least part of the light emitted by the first image display unit 4 passes through the light emitting panel 6 and enters the display panel 3, and then is reflected by the display panel 3 and the reflector 7 and enters the display panel 3 again, and then passes through the display panel 3 and enters the human eye, and the human eye can see an image, which is a virtual image, such as Figure 1 Similarly, when the control component 16 controls the second image display unit 5 to turn on and the first image display unit 4 to turn off, at least part of the light emitted by the second image display unit 5 passes through the light emitting panel 6 and enters the display panel 3, and after being reflected by the display panel 3 and the reflector 7, enters the display panel 3 again and passes through the display panel 3 to enter the human eye. The human eye can see an image, which is a virtual image. For example, it can be Figure 1By setting the path lengths of the optical paths of the first image display unit 4 and the second image display unit 5 to be different, the distances of the images of the light emitted by the first image display unit 4 and the images of the light emitted by the second image display unit 5 seen by the human eye can be different, as shown in the figure, the positions of the virtual image S and the virtual image P are different. In this way, by switching the alternating switching of the first image display unit 4 and the second image display unit 5 by the control component 16, the automatic far and near adjustment of the image seen by the human eye can be achieved, and the ciliary muscle can be stretched and contracted by switching the way of observing far and near images, and the ciliary muscle can be trained to improve the visual adjustment reserve and the far fusion reserve. This embodiment replaces the technical solution of manually flipping the double-sided mirror flip shot in the related art, improves the convenience of operation, and can effectively control the switching frequency and timing. In addition, the far and near switching solution is applied to the telescopic image display device 100, and correction can be performed in various application scenarios. For example, the double-sided mirror flip shot used in the related art is generally corrected by comparing the eye chart, and the training process is very boring, especially for children, long-term training is unacceptable. In this embodiment, the content played by the first image display unit 4 and the second image display unit 5 can be changed to a cartoon or an interesting educational film that children need, or can be set to be applied to a learning machine commonly used by children, so that the purpose of vision correction can be achieved through normal learning and entertainment, and the vision correction training will not bring too much extra burden to parents and children. This embodiment is particularly suitable for vision adjustment reserve training.

[0055] Reference Figure 2 In some embodiments, the path through which the first polarized light propagates from the first image display unit 4 to the reflecting concave surface of the reflecting element 7 is defined as the first light path, and the path through which the second polarized light propagates from the second image display unit 5 to the reflecting concave surface of the reflecting element 7 is defined as the second light path; then: the path length of the first light path is different from the path length of the second light path.

[0056] The first optical path Figure 2 The optical path indicated by X1 is as follows: Figure 2 X2 refers to the optical path. The first optical path is the image distance, which determines the distance from the virtual image generated by the first image display unit 4 seen by the human eye to the reflector 7; similarly, the second optical path is the image distance, which determines the distance from the virtual image generated by the second image display unit 5 seen by the human eye to the reflector 7. In this embodiment, the path length of the first optical path is different from the path length of the second optical path, so the image distances generated by the first image display unit 4 and the second image display unit 5 will also be different. For people observing from the light-emitting surface of the display panel 3, it is equivalent to being able to alternately see two virtual images of different distances.

[0057] In some embodiments, the light emitting panel 6 includes a front side and a back side, and the front side is arranged to face the display panel 3; the first light path includes a first incident segment emitted from the first image display unit 4 and incident to the front side through the back side; the second light path includes a second incident segment emitted from the second image display unit 5 and incident to the front side; the path length of the first incident segment is different from the path length of the second incident segment.

[0058] In the second half of the first optical path and the second optical path, that is, the section from the light emitting panel 6 to the display panel 3, and then reflected from the display panel 3 to the reflective concave surface of the reflector 7, the optical paths of the two can be set to basically overlap, so the difference in the path length of the first optical path and the second optical path is set in the first half of the first optical path and the second optical path. The first half of the first optical path is called the first incident section, and the first incident section includes the path length of the first light emitted from the first image display unit 4 to the back, and from the back of the light emitting panel 6 to the front. The first half of the second optical path is called the second incident section, and the second incident section includes the path length of the second light emitted from the second image display unit 5 to the front. The path lengths of the second half of the first optical path and the second optical path are the same, and the difference is set in the first half of the first optical path and the second optical path, that is, the path lengths of the first incident section and the second incident section are different. Therefore, the distance of the virtual image position generated can be adjusted by adjusting the positions of the first image display unit 4, the second image display unit 5 and the light emitting panel 6.

[0059] In some embodiments, the light output panel 6 includes a reflective polarizer, which can transmit most of the first polarized light and reflect most of the second polarized light; the display panel 3 includes a semi-transmissive and semi-reflective layer.

[0060] The reflective polarizer can transmit most of the light in a certain polarization direction, and transmit most of the light in another polarization direction. For example, if the reflective polarizer is a P reflective polarizing film, the first polarized light can be S polarized light, and the second polarized light can be P polarized light, then the P reflective polarizing film will reflect most of the P polarized light, and transmit most of the S polarized light. Specifically, the reflective polarizing film can adopt PBS (polarizing beam splitter), which can reflect more than 95% of the P polarized light and transmit more than 95% of the S polarized light, thereby improving the utilization rate of light energy. The display panel 3 includes a semi-transparent and semi-reflective layer, which can transmit part of the light and reflect part of the light, and the utilization rate of light energy is about 50%.

[0061] Reference Figure 2In some embodiments, the first image display unit 4 includes a first display screen 41 and a first polarizer 42, the second image display unit 5 includes a second display screen 51 and a second polarizer 52, the polarization direction of the first polarizer 42 and the polarization direction of the second polarizer 52 are perpendicular to each other, and the first polarization direction of the first polarized light and the second polarization direction of the second polarized light are perpendicular to each other.

[0062] The first image display unit 4 and the second image display unit 5 may be image generating units that can directly emit polarized light. In another embodiment, the first image display unit 4 includes a first display screen 41 and a first polarizer 42, and the second image display unit 5 includes a second display screen 51 and a second polarizer 52. The light emitted from the first display screen 41 forms a first polarized light in a first polarization direction after passing through the first polarizer 42, and the light emitted from the second display screen 51 forms a second polarized light in a second direction after passing through the second polarizer 52, and the polarization directions of the first polarizer 42 and the second polarizer 52 are perpendicular to each other, so as to make the first polarization direction of the first polarized light and the second polarization direction of the second polarized light respectively passing through the first polarizer 42 and the second polarizer 52 perpendicular to each other.

[0063] Reference Figure 3 In some embodiments, an adjustment lens 10 and an adjustment component 8 are further provided in the accommodating cavity 2. The adjustment component 8 includes a driving member 81, a driving screw 82 connected to the driving member 81, and a driving screw sleeve 83 mounted on the driving screw 82. The telescopic display device 100 also includes a limiting component 9. The limiting component 9 includes a limiting slide rod 91 installed on the housing 1 and a limiting sleeve 92 slidably installed on the limiting slide rod 91. The two ends of the adjustment lens 10 are respectively installed on the limiting sleeve 92 and the driving screw sleeve 83.

[0064] An adjustment lens 10 is also provided in the accommodating cavity 2. The first polarized light and the second polarized light are reflected by the display panel 3, pass through the adjustment lens 10, and enter the reflector 7. After being reflected by the reflector 7, the adjustment lens 10 is emitted from the display panel 3. In this embodiment, by providing the adjustment lens 10 between the display panel 3 and the reflector 7, the refractive power can be improved, and the thickness of the optical system can be shortened, thereby reducing the volume of the telescopic display device 100.

[0065] The adjustment component 8 is connected to the adjustment lens 10 to adjust the position of the adjustment lens 10. This embodiment can adjust the position of the adjustment lens 10 by setting the adjustment component 8. The adjustment of the lens position can adjust the position of the virtual image. Specifically, the virtual image position can be adjusted within a range of 0.8m to 10m from the human eye, that is, the position of the virtual image P and the virtual image S can be adjusted to facilitate people with different myopia levels to effectively read information, and by slightly exceeding the limit position where the myopic user can see the picture clearly, pseudomyopia can be corrected through micro-stimulation and true myopia can be controlled. Specifically, the adjustment of the position of the adjustment lens 10 can be moved along the central axis direction of the adjustment lens 10.

[0066] In some embodiments, the adjustment component 8 includes a driving member 81, a driving screw 82 connected to the driving member 81, and a driving screw sleeve 83 sleeved on the driving screw 82. The telescopic display device 100 also includes a limiting component 9, the limiting component 9 includes a limiting slide bar 91 installed on the housing 1 and a limiting sleeve 92 slidably installed on the limiting slide bar 91, and the two ends of the adjustment lens 10 are respectively installed on the limiting sleeve 92 and the driving screw sleeve 83. This embodiment describes the situation where an adjustment lens 10 is connected to only one driving member 81. The driving member 81 drives the driving screw 82 to move, and then drives the driving screw sleeve 83 to move through the driving screw 82, so that the adjustment lens 10 connected to the driving screw sleeve 83 moves together. In order to ensure the smoothness of movement and ensure that the adjusting lens 10 moves parallel to the central axis of the adjusting lens 10 itself, a fixed limiting slide rod 91 can be further provided at the other end of the adjusting lens 10, and a slidable limiting sleeve 92 is provided on the limiting slide rod 91. The two ends of the adjusting lens 10 are respectively installed on the limiting sleeve 92 and the driving screw sleeve 83. In this way, the limiting slide rod 91 and the limiting sleeve 92 themselves do not have power, but can guide and limit the movement of the adjusting lens 10.

[0067] In some embodiments, the number of the adjustment components 8 is two groups, and each group of the adjustment components 8 includes a driving member 81, a driving screw 82 connected to the driving member 81, and a driving screw sleeve 83 sleeved on the driving screw 82. The two driving screws 82 are arranged in parallel, and the two ends of the adjustment lens 10 are respectively installed on the two driving screw sleeves 83. This embodiment describes a situation in which a driving member 81 is respectively arranged at both ends of an adjustment lens 10. The driving member 81 moves through the driving screw 82, and then drives the driving screw sleeve 83 to move through the driving screw 82, so that the adjustment lens 10 connected to the driving screw sleeve 83 moves together. By arranging the driving members 81 at both ends of the adjustment lens 10, the movement of the adjustment lens 10 is more stable and the adjustment is more convenient.

[0068] In some embodiments, the central axis of the driving screw 82 is arranged parallel to the central axis of the adjusting lens 10, and the adjusting assembly 8 is used to adjust the position of the adjusting lens 10 along the central axis direction of the adjusting lens 10. The central axis of the driving screw 82, the central axis of the adjusting lens 10, and the central axis of the limiting slide bar 91 are all parallel to each other, so as to ensure that the directions and distances of movement of the two ends of the adjusting lens 10 are consistent, and the central axis position of the adjusting lens 10 is kept unchanged, and the adjusting lens 10 always moves in parallel, which is convenient for adjusting the virtual image distance.

[0069] In some embodiments, the driving member 81 includes a servo motor, the driving screw 82 is a screw, and the driving screw sleeve 83 is provided with an internal thread, and the driving screw sleeve 83 is threadedly connected to the driving screw 82 through the internal thread. The number of transmission circles of the screw can be accurately controlled by the servo motor. The screw rotates but does not move along its own central axis. During the rotation of the screw, the driving screw sleeve 83 connected thereto will be driven to move along the central axis of the screw, thereby driving the adjustment lens 10 to move, thereby adjusting the virtual image position. This embodiment is more accurate in adjustment by setting the servo motor and the screw, thereby improving the adjustment accuracy.

[0070] Reference Figure 3 In some embodiments, a mounting frame 11 is further provided in the accommodating cavity 2, and the mounting frame 11, the light emitting panel 6, and the first image display unit 4 are surrounded to form an inner cavity 18, and a light absorbing layer 12 is provided on the side of the mounting frame 11 facing the inner cavity 18. The mounting frame 11 can be provided independently of the outer shell 1, or can be formed by partially extending the outer shell 1 into the accommodating cavity 2, and is used to form a mounting position for the light emitting panel 6 and the first image display unit 4, and the mounting frame 11, the light emitting panel 6, and the first image display unit 4 are surrounded to form an inner cavity 18. Since the first polarized light may be partially reflected on the light emitting panel 6, or the second polarized light may be partially transmitted through the light emitting panel 6 into the inner cavity 18, a light absorbing layer 12 may be coated on the inner wall surface of the inner cavity 18 to absorb the excess light in the inner cavity 18 and reduce the crosstalk of the light. The light absorbing layer 12 here can be made of a light absorbing material, such as a black coating.

[0071] Reference Figure 3 In some embodiments, a light shield facing the light emitting surface 31 is provided on the housing 1. The semi-transparent and semi-reflective plate can reflect light and also transmit part of the light. Part of the light incident from the light emitting panel 6 to the display panel 3 will be reflected to the reflective member 7 at the display panel 3, and part of it will be emitted through the display panel 3. This part of the light is emitted upward. Therefore, a light shield can be provided on the housing 1 to absorb this part of the light, absorb the light emitted upward, and avoid the influence of excess light on the human eye's observation of the image.

[0072] Reference Figure 3 In some embodiments, the angle between the display panel 3 and the central axis of the adjustment lens 10 is 45° to 85°. Figure 3 As shown in α. In other words, the angle between the display panel 3 and the horizontal line is 45° to 85°. This embodiment enables the user to watch the telescopic display device 100 by basically looking directly at the display panel 3, which conforms to the viewing habits of the human eye and improves the user experience; at the same time, by setting the display panel 3 as close to vertical as possible, it can also reduce dust falling on the light-emitting surface 31, reduce dust accumulation, and thus reduce the wiping frequency, thereby avoiding damage to the telescopic display device 100. At the same time, the telescopic display device 100 can also be flipped so that the display panel 3 is set nearly vertically or at an obtuse angle to the horizontal line, further reducing the risk of dust accumulation.

[0073] Reference Figure 3 In some embodiments, a touch layer 19 is further provided on one side of the display panel 3 located on the light emitting surface 31. The touch layer 19 can realize touch screen control, and the telescopic display device 100 can be controlled by touching it, thereby improving the convenience of operation.

[0074] Reference Figure 5 In some embodiments, the reflector 7 includes a supporting area 71 and a reflecting area 72. The supporting area 71 is formed with a mounting hole. The reflecting area 72 is arranged in the mounting hole. A control circuit layer 17 is arranged on the side of the supporting area 71 away from the display panel 3. The reflector 7 can be a curved imaging mirror, including a reflecting area 72. The light emitted from the display screen is reflected to the reflecting area 72 through a semi-transparent and semi-reflective plate. Specifically, the reflecting area 72 is a curved reflecting area 72. The reflecting area 72 is made of glass, and a reflective coating is applied to the reflecting area 72 to reflect light. A control circuit layer 17 is arranged on the surface of the supporting area 71 away from the display screen. The control circuit layer 17 is arranged in a layered form on the supporting area 71, replacing the control component 16 in the related art. Refer to Figure 1 When the control component 16 is provided, the control component 16 generally appears in the form of a module, and space needs to be reserved for the control component 16 in the housing 1, which will undoubtedly increase the volume of the telescopic display device 100.

[0075] In the above-mentioned embodiment of the present invention, the control circuit layer 17 is arranged on the surface of the side of the support area 71 away from the display screen, which has at least the following advantages: 1. By eliminating the arrangement of the control component 16, the production cost is reduced, and the control component 16 does not need to be assembled, thereby improving the assembly efficiency; 2. After the arrangement of the control component 16 is eliminated, the overall size of the telescopic display device 100 can be reduced, and it is suitable for installation in some small-sized spaces, such as the headrest area of ​​a car. In the scene of a car, the general control component 16 (PCB board) is not firmly positioned due to the split design. The integrated design of the reflector 7 and the control circuit layer 17 can also reduce the vibration of the control circuit layer 17 during the driving process of the car; 3. The control circuit layer 17 is arranged on the support area 71 without involving the reflective area 72, so as to avoid the manufacturing of the drive circuit damaging the thinner position of the curved reflective area 72; 4. The control circuit layer 17 is arranged away from the side of the display screen. At this time, the reflector 7, as a heat insulating member, can separate the control circuit layer 17 from the environment where the display screen is located, so as to avoid the heat generated by the display screen from affecting the stability of the control circuit layer 17.

[0076] Reference Figure 6 In some embodiments, the image generating unit is a display screen, and the display screen is one of LCD, OLED, and MLED. It can be pulled out from the housing 1 by pulling and used as a display flat panel alone, which is also convenient for the maintenance and replacement of the display screen. Specifically, a notch is provided on the housing 1, and a sliding frame is slidably provided on the notch. The display screen is mounted on the sliding frame. The sliding frame is formed with a card slot that at least partially accommodates the display screen, and the sliding frame can slide on the notch and then pull out the display screen located on the sliding frame together, so as to facilitate the removal of the display screen. In addition, a charging interface can be provided on the sliding frame or the housing 1. When the display screen is put back into the sliding frame, the display screen can be electrically connected to the charging interface to charge the display screen. The charging interface can be electrically connected to the display screen through a power cord, or it can be directly connected in the form of a gold finger.

[0077] In some embodiments, the housing 1 is provided with a first notch, a first sliding frame is slidably provided on the first notch, the first image display unit 4 is provided on the first sliding frame, and a first charging interface is provided on the first sliding frame; and / or,

[0078] The housing 1 is provided with a second notch 13 , a second sliding frame 14 is slidably provided on the second notch 13 , the second image display unit 5 is provided on the second sliding frame 14 , and a second charging interface 15 is provided on the second sliding frame 14 .

[0079] The first image display unit 4 and the second image display unit 5 include a first display screen 41 and a second display screen 51, respectively. The first display screen 41 and the second display screen 51 are one of LCD, OLED, and MLED, and can be pulled out from the housing 1 by pulling, and used as a display panel alone, which is also convenient for the maintenance and replacement of the display screen. Specifically, a notch is provided on the housing 1, and a sliding frame is slidably provided on the notch. The display screen is mounted on the sliding frame. The sliding frame is formed with a card slot that at least partially accommodates the display screen, and the sliding frame can slide on the notch and then pull out the display screen located on the sliding frame together, so as to facilitate the removal of the display screen. In addition, a charging interface can be provided on the sliding frame or the housing 1. When the display screen is put back into the sliding frame, the display screen can be electrically connected to the charging interface to charge the display screen. The charging interface can be electrically connected to the display screen through a power cord, or it can be directly connected in the form of a gold finger. Specifically in this embodiment, a first sliding frame is correspondingly provided at the first notch, and a first charging interface is provided on the first sliding frame or the housing 1. The first display screen 41 is mounted on the first sliding frame, and can be electrically connected to the first charging interface for charging. Refer to Figure 6 , Figure 6 The structure diagram shown is that the second display screen 51 is slidably mounted on the housing 1. A second sliding frame 14 is correspondingly arranged at the second notch 13, and a second charging interface 15 is arranged on the second sliding frame 14 or the housing 1. The second display screen 51 is mounted on the second sliding frame 14 and can be electrically connected to the second charging interface 15 for charging.

[0080] Reference Figure 7 In some embodiments, the first image display unit 4 and the second image display unit 5 are located on the top of the display panel 3. To further reduce the possibility of dust accumulation, the telescopic display device 100 can be inverted, that is, the first image display unit 4 and the second image display unit 5 are arranged at the top position, and the display panel 3 is arranged at the bottom position, which can further reduce the possibility of dust accumulation.

[0081] Reference Figure 8 , Figure 8 FIG. 1 is a flow chart of a control method of a telescopic image display device 100 according to a first embodiment of the present invention. The control method of the telescopic image display device 100 is used to control the telescopic image display device 100 according to the above-mentioned telescopic image display device 100. The control method of the telescopic image display device 100 comprises the following steps:

[0082] S10, acquiring training parameters; wherein the training parameters include the luminous frequency and the ghosting time of the luminous light of the first image display unit 4 and the second image display unit 5;

[0083] According to the training mode we need, we can input training parameters into the telescopic image display device 100, or call the parameters built into the telescopic image display device 100. The training parameters at least include the luminous frequency of the first image display unit 4 and the second image display unit 5 and the ghosting time of the luminous light. The definition of the ghosting time is: the time interval from the closing of one display unit to the opening of the other display unit, which can be the time interval between the closing of the first image display unit 4 and the opening of the second image display unit 5, or the time interval between the closing of the second image display unit 5 and the opening of the first image display unit 4. Of course, the training parameters can also include information such as the switching frequency, the display time of the first image display unit 4 and the second image display unit 5, etc.

[0084] In step S10, the ghosting time includes at least one of the following:

[0085] Figure 9-11 In FIG. 1 , the dotted line indicated by C represents the timing line of opening and closing of the first image display unit 4, and the dotted line indicated by D represents the timing line of opening and closing of the second image display unit 5. Fig. 9 , the ghosting time is greater than 0; the ghosting time is greater than means that the first image display unit 4 and the second image display unit 5 are both turned on for a period of time, which is also to leave a transition time for the human eye to switch between near and far, reducing the fatigue of the human eye. Fig. 9 The H in the figure indicates the time portion when the coincidence is open.

[0086] Reference Fig.10 , the ghosting time is equal to 0; the ghosting time is equal to 0, which is equivalent to seamless switching, that is, when the first image display unit 4 is closed, the second image display unit 5 is immediately turned on; or when the second image display unit 5 is turned on, the first image display unit 4 is immediately turned on. Seamless switching can improve switching efficiency.

[0087] Reference Fig.11 , the ghosting time is less than 0; wherein, when the ghosting time is less than 0, the ghosting time indicates the time interval during which the first image display unit 4 and the second image display unit 5 are simultaneously non-luminous. The ghosting time is less than 0, which means that the first image display unit 4 and the second image display unit 5 emit light alternately and have a certain time interval, that is, there is a time interval during which both the first image display unit 4 and the second image display unit 5 are non-luminous. That is, the second image display unit 5 is turned on after the first image display unit 4 is turned off for a period of time, or the first image display unit 4 is turned on after the second image display unit 5 is turned off for a period of time, and the human eye sees a short period of black screen time. This embodiment can not only give the human eye time to rest and adjust during the switching process of far and near images, but also reduce the waste of light energy.

[0088] S20, controlling the first image display unit 4 and the second image display unit 5 to emit light alternately according to the training parameters.

[0089] When the control component 16 controls the first image display unit 4 to turn on and the second image display unit 5 to turn off, at least part of the light emitted by the first image display unit 4 passes through the light emitting panel 6 and enters the display panel 3, and then is reflected by the display panel 3 and the reflector 7 and enters the display panel 3 again, and then passes through the display panel 3 and enters the human eye, and the human eye can see an image, which is a virtual image, such as Figure 1 Similarly, when the control component 16 controls the second image display unit 5 to turn on and the first image display unit 4 to turn off, at least part of the light emitted by the second image display unit 5 passes through the light emitting panel 6 and enters the display panel 3, and after being reflected by the display panel 3 and the reflector 7, enters the display panel 3 again and passes through the display panel 3 to enter the human eye. The human eye can see an image, which is a virtual image. For example, it can be Figure 1 By setting the path lengths of the optical paths of the first image display unit 4 and the second image display unit 5 to be different, the distances between the image of the light emitted by the first image display unit 4 and the image of the light emitted by the second image display unit 5 seen by the human eye can be different.

[0090] In the above-mentioned embodiment of the present invention, the alternating switching of the first image display unit 4 and the second image display unit 5 is switched by the control component 16, so that the automatic far and near adjustment of the image seen by the human eye can be realized, and the ciliary muscle is stretched and contracted by switching the way of observing far and near images, and the ciliary muscle is trained to improve the visual adjustment reserve and the far fusion reserve. This embodiment replaces the technical solution of manually flipping the double-sided mirror flip shot in the related art, improves the convenience of operation, and can effectively control the switching frequency and timing. In addition, the far and near switching solution is applied to the far image display device 100, and correction can be performed when training is not possible. For example, the double-sided mirror flip shot used in the related art is generally corrected by comparing the eye chart, and the training process is very boring, especially for children, long-term training is unacceptable. However, this embodiment can change the content played by the first image display unit 4 and the second image display unit 5 to cartoons or interesting educational films needed by children, and the setting can be applied to the learning machine commonly used by children. The purpose of vision correction is achieved through normal learning and entertainment, and it will not bring too much extra burden to parents and children because of vision correction training. This embodiment is particularly suitable for vision adjustment reserve training.

[0091] Reference Fig.12 , Fig.12The flowchart of the control method of the telescopic image display device 100 according to the second embodiment of the present invention is shown. The training parameters also include image position information. After the step of acquiring the training parameters, and before the step of controlling the first image display unit 4 and the second image display unit 5 to alternately emit light according to the training parameters, the following steps are also included:

[0092] S11, obtaining a target position of the adjustment lens 10 according to the image position information;

[0093] The image position information refers to the position of the virtual image to be seen, that is, the distance from the virtual image to the human eye or the reflector 7. Of course, the size information of the image can be obtained first, and then converted into the image position information according to the size information of the image. Because the position of the image can be adjusted by adjusting the lens 10, the target position to which the adjusting lens 10 needs to be adjusted can be inferred according to the image position information.

[0094] S12, controlling the adjusting component 8 to drive the adjusting lens 10 to move to the target position.

[0095] The adjusting lens 10 is driven to move along the direction of its own optical axis by the adjusting component 8, and the adjusting lens 10 is moved to the target position. The adjustment of the position of the adjusting lens 10 can adjust the position of the virtual image, and specifically can realize the adjustment of the virtual image position in the range of 0.8m-10m from the human eye. The adjusting component 8 includes a driving member 81, a driving screw 82 connected to the driving member 81, and a driving screw sleeve 83 sleeved on the driving screw 82. The telescopic image display device 100 also includes a limiting component 9, and the limiting component 9 includes a limiting slide bar 91 installed on the housing 1 and a limiting sleeve 92 slidably installed on the limiting slide bar 91. The two ends of the adjusting lens 10 are respectively installed on the limiting sleeve 92 and the driving screw sleeve 83. The embodiment describes the situation that an adjusting lens 10 is only connected to one driving member 81. The driving member 81 drives the driving screw 82 to move, and then drives the driving screw sleeve 83 to move through the driving screw 82, so that the adjusting lens 10 connected to the driving screw sleeve 83 moves together. In order to ensure the smoothness of movement and ensure that the adjusting lens 10 moves parallel to the central axis of the adjusting lens 10 itself, a fixed limiting slide rod 91 can be further provided at the other end of the adjusting lens 10, and a slidable limiting sleeve 92 is provided on the limiting slide rod 91. The two ends of the adjusting lens 10 are respectively installed on the limiting sleeve 92 and the driving screw sleeve 83. In this way, the limiting slide rod 91 and the limiting sleeve 92 themselves do not have power, but can guide and limit the movement of the adjusting lens 10.

[0096] In the above-mentioned embodiment of the present invention, since each user has different vision conditions, it is necessary to switch between images of different sizes or images of different positions. Therefore, the adjustment component 8 drives the adjustment lens 10 to move, so as to change the imaging position of the virtual image on the reflector 7, thereby changing the image size and position, so that the user can adjust the image position according to different training needs.

[0097] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A telescopic image display device, characterized in that: The device comprises a housing, a control component, a first image display unit, a second image display unit, a display panel, a light emitting panel and a reflector, wherein a receiving cavity and an opening communicating with the receiving cavity are formed in the housing, and the display panel is installed in the opening; the first image display unit, the second image display unit, the light emitting panel and the reflector are all arranged in the receiving cavity; The first image display unit is used to emit a first polarized light in a first polarization direction and at least partially pass through the light emitting panel to be incident on the display panel; the second image display unit is used to emit a second polarized light in a second polarization direction and reflect from the light emitting panel to be incident on the display panel, the first polarized light and the second polarized light are reflected from the display panel and are incident on the reflector, and are reflected from the reflector and then emitted through the display panel; The control component is used to control the first image display unit and the second image display unit to emit light alternately, so that two images at different distances can be alternately observed from the light emitting surface of the display panel.

2. The telescopic image display device according to claim 1, characterized in that: Define the path that the first polarized light propagates from the first image display unit to the reflective concave surface of the reflector as the first light path, and the path that the second polarized light propagates from the second image display unit to the reflective concave surface of the reflector as the second light path; then: A path length of the first light path is different from a path length of the second light path.

3. The telescopic image display device according to claim 2, characterized in that: The light emitting panel comprises a front side and a back side, and the front side is arranged facing the display panel; The first light path includes a first incident segment emitted from the first image display unit and incident on the front side through the back side; the second light path includes a second incident segment emitted from the second image display unit and incident on the front side; The path length of the first incident segment is different from the path length of the second incident segment.

4. The telescopic image display device according to claim 1, characterized in that: The light emitting panel includes a reflective polarizer, which can transmit most of the first polarized light and reflect most of the second polarized light; the display panel includes a semi-transmissive and semi-reflective layer.

5. The telescopic image display device according to any one of claims 1 to 4, characterized in that: The first image display unit includes a first display screen and a first polarizer, the second image display unit includes a second display screen and a second polarizer, the polarization direction of the first polarizer is perpendicular to the polarization direction of the second polarizer, and the first polarization direction of the first polarized light and the second polarization direction of the second polarized light are perpendicular to each other.

6. The telescopic image display device according to any one of claims 1 to 4, characterized in that: An adjustment lens and an adjustment component are also provided in the accommodating cavity, wherein the adjustment component includes a driving member, a driving screw connected to the driving member, and a driving screw sleeve sleeved on the driving screw. The telescopic image display device also includes a limiting component, wherein the limiting component includes a limiting slide rod installed on the outer shell and a limiting slide sleeve slidably installed on the limiting slide rod, and the two ends of the adjustment lens are respectively installed on the limiting slide sleeve and the driving screw sleeve.

7. The telescopic image display device according to any one of claims 1 to 4, characterized in that: A mounting frame is further provided in the accommodating cavity, the mounting frame, the light emitting panel and the first image display unit are surrounded to form an inner cavity, and a light absorbing layer is provided on a side of the mounting frame facing the inner cavity; and / or, The housing is provided with a light shield facing the light emitting surface; and / or, The first image display unit and the second image display unit are located on top of the display panel.

8. A control method for a telescopic image display device, characterized in that: Used to control the telescopic image display device according to any one of claims 1 to 7, the control method of the telescopic image display device comprises the following steps: Acquire training parameters; wherein the training parameters include the luminous frequency and the ghosting time of the luminous light of the first image display unit and the second image display unit; The first image display unit and the second image display unit are controlled to emit light alternately according to the training parameters.

9. The control method of the telescopic image display device according to claim 8, characterized in that: The ghosting time includes at least one of the following: The ghosting time is greater than 0; or, The ghosting time is equal to 0; or, The ghosting time is less than 0; wherein, when the ghosting time is less than 0, the ghosting time represents a time interval during which the first image display unit and the second image display unit do not emit light at the same time.

10. The control method of the telescopic image display device according to claim 9, characterized in that: The training parameters also include image position information. After the step of acquiring the training parameters and before the step of controlling the first image display unit and the second image display unit to alternately emit light according to the training parameters, the following steps are also included: According to the image position information, obtaining a target position of the adjustment lens; The control adjustment component drives the adjustment lens to move to the target position.

Images