CN116360115B - Near-to-eye display device - Google Patents
Near-to-eye display device Download PDFInfo
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- CN116360115B CN116360115B CN202310634635.6A CN202310634635A CN116360115B CN 116360115 B CN116360115 B CN 116360115B CN 202310634635 A CN202310634635 A CN 202310634635A CN 116360115 B CN116360115 B CN 116360115B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
- G02B2027/0174—Head mounted characterised by optical features holographic
Abstract
The application relates to the technical field of optics, and discloses near-eye display equipment, which comprises a waveguide element; a projection light source for outputting projection light; the coupling-in element is used for coupling the projection light into the waveguide element for total reflection transmission; a coupling-out element for coupling out the projection light transmitted by total internal reflection of the waveguide element; the coupling-out element at least comprises a first coupling-out structure corresponding to the first coupling-out region and a second coupling-out structure corresponding to the second coupling-out region; the first coupling-out structure of the coupling-out element has a set optical power; setting the focal power as the focal power corresponding to correcting the ametropia of the user; or, the second out-coupling structure of the out-coupling element has an optical power opposite to the set optical power. The near-to-eye display device provided by the application can meet the requirements that a wearer can normally watch various projection pictures, and is beneficial to relieving the refractive errors of the wearer, so that the electronic device is used and the vision health is improved.
Description
Technical Field
The application relates to the technical field of optics, in particular to near-eye display equipment.
Background
At present, the proportion of refractive errors such as myopia or hyperopia of teenagers is higher and deeper, and once the refractive errors occur in teenagers, the degree of the refractive errors also rises year by year, and the rising speed is also fast. The problem is that the texting pressure is increased, and the electronic products are used more. However, with the development of science and technology, electronic products have gradually become an indispensable part of people's life. This gives people a somewhat dilemma in using electronics and vision health.
Disclosure of Invention
The application aims to provide near-eye display equipment which can meet the requirement that a wearer can normally watch various projection pictures and is beneficial to relieving refractive errors of the wearer, so that the electronic equipment is used and vision health is improved.
In order to solve the technical problems, the application provides a near-eye display device, which comprises a waveguide element; a projection light source for outputting projection light; a coupling-in element for coupling the projection light into the waveguide element for total reflection transmission; a coupling-out element for coupling out the projection light transmitted by total internal reflection in the waveguide element;
the coupling-out element at least comprises a first coupling-out structure corresponding to the first coupling-out area and a second coupling-out structure corresponding to the second coupling-out area;
the first coupling-out structure of the coupling-out element has a set optical power; the set optical power is the optical power corresponding to the correction of the ametropia of the user;
or, the second out-coupling structure of the out-coupling element has an optical power opposite to the set optical power.
In an alternative embodiment of the application, when the first out-coupling structure of the out-coupling element has a set optical power;
the coupling-out element comprises a coupling-out grating covering the first coupling-out region and the second coupling-out region, and a first holographic optical element which is arranged corresponding to the first coupling-out region in a fitting way; wherein the first holographic optical element has a set optical power.
In an alternative embodiment of the application, a second holographic optical element is provided on the outcoupling grating in a position corresponding to the second outcoupling area.
In an alternative embodiment of the application, when the second out-coupling structure of the out-coupling element has an optical power opposite to the set optical power;
the coupling-out element comprises a coupling-out grating covering the first coupling-out region and the second coupling-out region, and the coupling-out grating is attached to a second holographic optical element arranged corresponding to the second coupling-out region;
wherein the second holographic optical element is an element having an optical power opposite to the set optical power.
In an optional embodiment of the present application, the coupling-out grating includes a first coupling-out grating, a second coupling-out grating, and a third coupling-out grating that are stacked in order;
the first coupling-out grating, the second coupling-out grating and the third coupling-out grating are respectively used for diffracting projection light rays in different wavelength ranges.
In an alternative embodiment of the application, when the first out-coupling structure of the out-coupling element has a set optical power;
the coupling-out element comprises a first holographic optical element arranged in the first coupling-out region and a second holographic optical element arranged in the second coupling-out region; wherein the first holographic optical element has the set optical power.
In an alternative embodiment of the application, the second outcoupling area is a ring-shaped area centered on the first outcoupling area.
In an optional embodiment of the present application, the set optical power is an optical power corresponding to correction of a projection picture formed by viewing green light waves by a user with myopia ametropia; after the projection light outputted by the projection light source is outputted through the first coupling-out structure, blue light rays in the projection light rays are imaged in front of retina of the user, green light rays are imaged on retina of the user, and red light rays are imaged behind retina of the user.
In an alternative embodiment of the present application, the projection light source is configured to switch and output at least a first projection light and a second projection light; the laser power of the first projection light is 1.5-3mW, the wavelength is 647 nm-660 nm, and the laser power for entering eyes is not more than 0.39mW.
In an alternative embodiment of the application, the device further comprises a red light emitter for outputting red light with a wavelength of 650nm into the eye of the wearer, wherein the power of the incident laser is not more than 0.39mW.
The near-eye display device provided by the application comprises a waveguide element; a projection light source for outputting projection light; the coupling-in element is used for coupling the projection light into the waveguide element for total reflection transmission; a coupling-out element for coupling out the projection light transmitted by total internal reflection of the waveguide element; the coupling-out element at least comprises a first coupling-out structure corresponding to the first coupling-out region and a second coupling-out structure corresponding to the second coupling-out region; the first coupling-out structure of the coupling-out element has a set optical power; setting the focal power as the focal power corresponding to correcting the ametropia of the user; or, the second out-coupling structure of the out-coupling element has an optical power opposite to the set optical power.
The near-eye display device is further divided into a first coupling-out area and a second coupling-out area in the coupling-out area corresponding to the coupling-out element of the waveguide element on the basis that the near-eye projection display can be realized by utilizing the waveguide element and the projection light source; and the structure of the coupling-out element corresponding to the first coupling-out region is used as a first coupling-out structure, and the structure corresponding to the second coupling-out region is used as a second coupling-out structure; the first coupling-out structure has a set optical power and the second coupling-out structure has no optical power, or the first coupling-out structure has no optical power and the second coupling-out structure has optical power opposite to the set optical power for a wearer wearing the glasses with refractive correction. The projection light coupled out by the first coupling-out area can be imaged on the retina of the wearer with refractive errors, so that the wearer can see a clear projection picture; the projection light coupled out by the second coupling-out region is imaged at a position deviated from the retina of the wearer, so that the problem of further deepening the degree of refractive error of the wearer is solved, and the gradual recovery of the refractive error of the wearer can be facilitated.
Therefore, the near-to-eye display device provided by the application can meet the requirement that a wearer can normally watch various projection pictures, and is beneficial to relieving the ametropia of the wearer, so that the electronic device is used and the vision health is improved.
Drawings
For a clearer description of embodiments of the application or of the prior art, the drawings that are used in the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an optical path structure of a near-eye display device according to an embodiment of the present application;
fig. 2 is a schematic diagram of an optical path principle for correcting myopic refractive errors according to an embodiment of the present application;
fig. 3 is a schematic diagram of an optical path for correcting hyperopic refractive errors according to an embodiment of the present application;
fig. 4 is a schematic diagram of another optical path structure of a near-eye display device according to an embodiment of the present application;
fig. 5 is a schematic view of another optical path structure of a near-eye display device according to an embodiment of the present application;
fig. 6 is a schematic diagram of a further optical path structure of a near-eye display device according to an embodiment of the present application;
fig. 7 is a schematic diagram of coupling-out region distribution in a near-eye display device according to an embodiment of the present application;
fig. 8 is another schematic distribution diagram of the coupling-out area in the near-eye display device according to the embodiment of the application.
Detailed Description
Ametropia includes both hyperopia and myopia; the main reason of the hyperopia is the hyperopia defect caused by the shortened eye axis, so that under the condition of not using an external auxiliary tool, the light rays can be imaged behind the retina of the human eye after being incident on the human eye, and the problem of unclear vision is caused; myopia is mainly caused by defects caused by elongation of the eye axis, and under the condition of no aid, light rays are incident to human eyes and then can be imaged before the retina of the human eyes, so that the problem of unclear vision is also caused.
Therefore, the application provides an optical display technology, so that a wearer with abnormal wearing can normally watch the projection image and simultaneously has a certain effect of relieving the refraction error, thereby achieving the aim of taking into account the use of electronic equipment and vision health.
In order to better understand the aspects of the present application, the present application will be described in further detail with reference to the accompanying drawings and detailed description. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As shown in fig. 1 to 6, fig. 1 is a schematic view of an optical path structure of a near-eye display device according to an embodiment of the present application; fig. 2 is a schematic diagram of an optical path principle for correcting myopic refractive errors according to an embodiment of the present application; fig. 3 is a schematic diagram of an optical path for correcting hyperopic refractive errors according to an embodiment of the present application; fig. 4 is a schematic diagram of another optical path structure of a near-eye display device according to an embodiment of the present application; fig. 5 is a schematic view of another optical path structure of a near-eye display device according to an embodiment of the present application; fig. 6 is a schematic diagram of another optical path structure of a near-eye display device according to an embodiment of the application.
A specific near-eye display device provided by the application may include:
a waveguide element 1; a projection light source for outputting projection light; a coupling-in element 2 for coupling the projection light into the waveguide element 1 for total reflection transmission; a coupling-out element 3 for coupling out the projection light transmitted by total internal reflection of the waveguide element 1;
wherein the coupling-out element 3 comprises at least a first coupling-out structure corresponding to the first coupling-out region and a second coupling-out structure corresponding to the second coupling-out region;
the first out-coupling structure of the out-coupling element 3 has a set optical power; setting the focal power as the focal power corresponding to correcting the ametropia of the user;
alternatively, the second out-coupling structure of the out-coupling element 3 has an optical power opposite to the set optical power.
As shown in fig. 1, the projection light outputted from the projection light source is coupled into the waveguide element 1 through the coupling-in element 2 at the coupling-in end of the waveguide element 1, and is incident into the coupling-out region of the waveguide element 1 after the total reflection transmission is generated in the waveguide element 1, and the projection light is coupled out to the human eye through the coupling-out element 3.
But further taking into account that a wearer wearing the near-eye display device may have a myopic or hyperopic refractive error. For this purpose, the coupling-out region in which the coupling-out element 3 is located is divided into a first coupling-out region and a second coupling-out region in the present embodiment.
Wherein, when the first coupling-out structure of the coupling-out element 3 located in the first coupling-out region has a set optical power corresponding to the refractive error of the user; accordingly, there may be a plurality of different arrangements for the second out-coupling structure; taking the second coupling-out structure without optical power as an example, if the user has refractive error, it is obvious that the projection light is coupled out to the human eye through the first coupling-out structure corresponding to the first coupling-out region, because the first coupling-out structure has the set optical power, the projection light output through the first coupling-out structure can be imaged on the retina of the human eye.
Since the second coupling-out structure has no optical power, if the user is near-sighted, the projection light output by the second coupling-out structure is obviously imaged at a position in front of the retina of the human eye. As shown in fig. 1, the second coupling-out structure is at a peripheral portion of the first coupling-out structure; accordingly, the projection light outputted by the first coupling-out structure is mainly transmitted to the area of the center of the retina, and the projection light outputted by the second coupling-out structure is mainly transmitted to the area of the edge of the retina. As shown in fig. 2, the dotted line in fig. 2 is the imaging plane of the projection light, and the solid line is the actual position of the retina. Because the eyes have physiological tendencies, the retina can approach to a clear place, when the periphery of the second coupling-out structure is out of focus, so that projection light is imaged in front of the retina, the retina has a forward approach trend, the rearward expansion trend of the periphery retina is eliminated, the growth of the eye axis is controlled, and the further deepening of myopia and ametropia can be relieved to a certain extent. And along with the increase of the using time of near-eye display equipment, the length of an eye axis can be shortened to a certain extent, so that the purpose of reducing myopia and ametropia is achieved.
In addition, on the basis that the first coupling-out structure of the first coupling-out region has the set optical power corresponding to the refractive error of the user, the second coupling-out structure can also have the optical power which is positive and negative as the first coupling-out structure but has the size smaller than the set optical power. The projection light which is output by the second coupling-out structure can be imaged at a position in front of the retina of the eye with myopia and ametropia; and for imaging positions of the projection light rays when the second outcoupling structure has no optical power, the imaging positions of the projection light rays in the present embodiment are closer to the retina.
In addition, the second coupling-out structure may have an optical power opposite to the optical power of the first coupling-out structure on the basis that the first coupling-out structure of the first coupling-out region has the optical power set to correct the refractive error of the user. The projection light which is output by the second coupling-out structure can be imaged at a position in front of the retina of the eye with myopia and ametropia; and for imaging positions of the projection light rays when the second outcoupling structure has no optical power, the imaging positions of the projection light rays in the present embodiment are further away from the retina.
If the user is far vision, the second coupling-out structure can be provided with three different structures of optical power which are not provided with optical power, have optical power which is positive and negative opposite to the set optical power and have optical power which is positive and negative the same as the set optical power but smaller than the set optical power, and can also ensure that
The projection light output by the second out-coupling structure is imaged at a position behind the retina of the human eye. As shown in fig. 3, the eye axis is also elongated subconsciously because of the tendency of the retina to see the image imaged behind the retina, thereby achieving a further deepening of the relief of hyperopic refractive errors and achieving the purpose of relief of hyperopic refractive errors with prolonged use of the near-eye display device.
Furthermore, it is further contemplated in the present application that during actual use of the near-eye display device, the user may be accustomed to wearing near-or far-vision glasses that correct their own refractive errors, and then wear the near-eye display device of the present application. Obviously, the coupling-out element 3 of the near-eye display device according to the application does not need to correct the refraction abnormality of the projection light, so that the user can clearly view the projection image by means of the glasses worn by the user.
On the basis of ensuring that the user can clearly watch the projection image, the ametropia of the user can be relieved to a certain extent. A further alternative embodiment is provided in the application, in which the part of the waveguide element 1 where the outcoupling element 3 is located in the first outcoupling region is provided as a first outcoupling structure having no optical power; the second coupling-out structure in the second coupling-out region has the optical power opposite to the set optical power; the set optical power is also optical power capable of correcting refractive errors of the user.
Therefore, when a user wearing the glasses with the ametropia correction uses the near-eye display device, obviously, the projection light is transmitted through the glasses lenses of the user again after being output by the first coupling-out structure and then is incident to the human eyes, and obviously, the part of projection light can be normally imaged on the retina of the human eyes due to the ametropia correction function of the glasses lenses. However, the second coupling-out structure couples out the output projection light, because the second coupling-out structure has the optical power opposite to the set optical power, and the projection light is transmitted to the glasses lens with the set optical power and then is incident to the human eye after being coupled out by the second coupling-out structure. Obviously, the same principle as that of relieving the ametropia of the wearer is adopted, and the near-eye display device in the embodiment can also achieve the effect of relieving the ametropia of the user and relieving the ametropia to a certain extent.
In addition, the optical power of the spectacle lens used by the wearer can be generally closer to the optical power corresponding to the actual refractive error of the user, and the optical power of the second coupling structure can be opposite to the optical power of the spectacle lens of the user, so that the embodiment is not particularly limited.
In addition, although the coupling-out element 3 is divided into the first coupling-out structure and the second coupling-out structure in the present embodiment, in practical application, it is not necessarily required that the coupling-out element 3 is provided with mutually independent coupling-out structures in the first coupling-out region and the second coupling-out region, in this embodiment and the following embodiments, only the structure of the coupling-out element provided on the coupling-out element in the first coupling-out region is referred to as a first coupling-out structure, and the structure of the coupling-out element provided on the second coupling-out region is referred to as a second coupling-out structure, and the first coupling-out structure and the second coupling-out structure may be one optical element structure or a structure including a plurality of optical elements, and the first coupling-out structure and the second coupling-out structure may be mutually independent structures or be an integral structure.
Embodiments of the various structures of the coupling-out element will be described in detail below.
In an alternative embodiment of the application, the first out-coupling structure when the out-coupling element 3 has a set optical power;
the coupling-out element 3 comprises a coupling-out grating 31 covering the first and second coupling-out regions, and a first holographic optical element 321 arranged in correspondence of the first coupling-out region in a fitting manner with the coupling-out grating 31; wherein the first holographic optical element 321 has a set optical power.
As shown in fig. 4, based on the above discussion, for the present embodiment, the first coupling-out structure of the coupling-out element 3 includes a partial grating of the coupling-out grating located in the first coupling-out region and the first holographic optical element 321; the second coupling-out structure of the coupling-out element 3 is a part of the coupling-out grating 31 covering the second coupling-out region. Because the first holographic optical element 321 has a set optical power, and the coupling-out grating 31 does not have optical power, the portion of the coupling-out grating 31 located in the first coupling-out region and the first holographic optical element 321 as a whole have set optical power, and the second coupling-out structure formed by the partial grating of the coupling-out grating 21 does not have optical power.
Therefore, when the projection light outputted by the projection light source is coupled into the waveguide element 1 through the coupling-in element 2 and then is incident into the coupling-out area where the coupling-out element 3 is located, a part of the projection light is diffracted and outputted through the coupling-out grating 3 and then is diffracted for the second time through the first holographic optical element 321, so that a user can watch a clear projection picture; and a part of projection light is diffracted by the coupling-out grating 31 at the second coupling-out region and then enters the human eye, and is imaged before or after the retina, so that the aim of relieving or even reducing the refractive abnormality of the human eye is fulfilled.
Of course, in practical applications, it is also conceivable to provide the second holographic optical element 322 without optical power in a lamination on the portion of the outcoupling grating 31 located in the second outcoupling region.
It will be appreciated that the coupling-out element 3 on the waveguide element of the present application has two functions, namely, that of coupling out the projection light from the waveguide element, that of enabling the projection light coupled out from the first coupling-out region to be imaged on the retina of a human eye, and that of enabling the projection light coupled out from the second coupling-out region to be imaged off the retina of a human eye.
For the present embodiment, the function of coupling out the projection light from the waveguide element 1 is mainly implemented by the coupling-out grating 31, and the first holographic optical element 321 is used for imaging a part of the coupled-out projection light on the retina of the human eye, and the other part of the projection light can be directly deflected from the retina for imaging after being coupled out from the coupling-out grating 31, or can be deflected from the retina for imaging after being diffracted and output by the second holographic optical element 322.
It is clear that the above two functions for the coupling-out element 3 can also be achieved by the same optical element. In a further alternative embodiment of the application, the first out-coupling structure when the out-coupling element 3 has a set optical power;
the outcoupling element 3 comprises a first holographic optical element 321 arranged in a first outcoupling region and a second holographic optical element 322 arranged in a second outcoupling region; wherein the first holographic optical element 321 has a set optical power.
In this embodiment, the first holographic optical element 321 can diffract the projection light incident on the first coupling-out area to couple out the waveguide element 1, and meanwhile, the first holographic optical element 321 also has a set optical power, so that the first holographic optical element 321 also has the function of adjusting the divergence or convergence of the projection light, and further ensures that the part of projection light can be imaged on the retina of the human eye after being directly diffracted and output to the human eye through the first holographic optical element 321.
In the second holographic optical element 322, the projection light incident on the second coupling-out region is diffracted and then directly coupled out to the human eye, and the second holographic optical element 322 has no optical power, so that the divergence of the projection light is not adjusted, and the projection light of the portion can deviate from retinal imaging.
In a further alternative embodiment of the application, the first out-coupling structure when the out-coupling element 3 has a set optical power;
the coupling-out element 3 comprises a coupling-out grating 31 covering the first and the second coupling-out regions, and a second holographic optical element 322 is arranged on the coupling-out grating 31 in a position corresponding to the second coupling-out region.
The coupling-out grating 31 has a set optical power, and the second holographic optical element 322 has an optical power opposite to the set optical power.
In the present embodiment, the coupling-out grating 31 diffracts the coupled projection light, and the projection light output corresponding to the first coupling-out region is directly incident to the human eye, so that the image can be formed on the retina of the human eye; and the projection light outputted corresponding to the second coupling-out region is outputted after being diffracted again by the second holographic optical element 322, because the optical powers of the second holographic optical element 322 and the coupling-out grating 31 are opposite, the adjustment of the divergence angle of the projection light is also mutually offset, so that the part of the projection light can deviate from the retinal image of the human eye.
As described above, when the user wears the near-eye display device of the present application, the user may also wear glasses for correcting refractive errors thereof, and thus, the near-eye display device used may include, for the user himself already wearing glasses for correcting Ji Quguang errors:
when the second out-coupling structure of the out-coupling element 3 has an optical power opposite to the set optical power;
the coupling-out element 3 comprises a coupling-out grating 31 covering the first and second coupling-out regions, and a second holographic optical element 322 arranged in correspondence of the second coupling-out region to which the coupling-out grating 3 is attached;
the second hologram optical element 322 is an element having an optical power opposite to the set optical power.
As shown in fig. 5, in the embodiment shown in fig. 5, after the projection light is completely diffracted and coupled out from the waveguide element 1 by the coupling-out grating 31, the projection light coupled out corresponding to the first coupling-out area is subjected to refractive correction effect of the glasses lens worn by the user, so that the part of the projection light can be imaged on the retina of the user, and the projection light coupled out corresponding to the second coupling-out area is finally deviated from the retina of the human eye because of the refractive adjustment effect of the second holographic optical element 322 and the glasses lens on the part of the projection light.
Based on the above embodiments, in the embodiment in which the coupling-out element 3 includes the coupling-out grating 31, the projection light is mainly diffracted and coupled out by the coupling-out grating 31. In order to further increase the efficiency with which the projection light is diffraction-coupled out of the waveguide element 1. In another alternative embodiment of the present application, the out-coupling grating 31 includes a first out-coupling grating 311, a second out-coupling grating 312, and a third out-coupling grating 313 stacked in order;
the first outcoupling grating 311, the second outcoupling grating 312, and the third outcoupling grating 313 are respectively configured to diffract the projection light within different wavelength ranges.
The wavelength ranges in which the first, second and third outcoupling gratings 311, 312 and 313 can diffract more efficiently may be a red wavelength range, a green wavelength range and a blue wavelength range, respectively. Of course, in practical applications, the diffractable waveguide ranges corresponding to the three coupling gratings are not excluded from other wavelength range ranges in the present application, and may be specifically set according to practical needs.
As shown in fig. 6, in the embodiment shown in fig. 6, the coupling-out region of the waveguide element 1 is provided with a first coupling-out grating 311, a second coupling-out grating 312, and a third coupling-out grating 313, which are stacked in order. And a first holographic optical element 321 and a second holographic optical element 322 are further stacked on the side of the third outcoupling grating 313 facing away from the second outcoupling grating 312.
It will be appreciated that in the embodiment shown in fig. 6, the first holographic optical element 321 has a set optical power, mainly for the case where the user does not wear glasses for correcting his refractive error. Wherein the second holographic optical element 322 may also be considered for removal.
For embodiments of near-eye display devices where the user wears spectacle lenses capable of correcting their refractive errors, it is equally possible to use a first outcoupling grating 311, a second outcoupling grating 312 and a third outcoupling grating 313, similar to those shown in fig. 6, for diffracting projection light in different wavelength ranges, respectively, but different from this embodiment, it is not necessary to provide a first holographic optical element 321 corresponding to the first outcoupling region, but a second holographic optical element 322 corresponding to the second outcoupling region should have an optical power opposite to the set optical power.
In the above embodiments, the projection light outputted from the first coupling-out region of the coupling-out end of the waveguide element 1 is finally clearly imaged on the retina of the human eye, so that the user can normally watch the projection image; the projection light output from the second coupling-out region is finally imaged at a position deviated from the retina. To this end, in order to ensure that the user can more clearly and completely view the projection screen, as shown in fig. 7, in another alternative embodiment of the present application, the second coupling-out area is a ring-shaped area centered on the first coupling-out area. In general, the area occupied by the first coupling-out region should not be too small, and the projection light coupled out by the second coupling-out region is generally incident to human eyes from the edge portion of the projection light beam as the residual light received by the human eye edge position.
The specific shape of the second coupling-out region may be a circular ring region, an elliptical ring region, a square ring region, or other regular polygon regions, which is not particularly limited in the present application.
Of course, in practical applications, it is not excluded that the second coupling-out area is a non-annular area, as shown in fig. 8, and the second coupling-out area may be just a strip-shaped area near the edge of the entire coupling-out area or an area formed by a plurality of spot-shaped areas together.
Further considering, there is sufficient experimental evidence that longitudinal chromatic aberration of red, green and blue light can induce the animal to develop toward hyperopia. For the animals with myopia, the animals are exposed to light rays forming three-color longitudinal chromatic aberration, so that the growth of the eye axis can be inhibited, and the myopia degree can be prevented from being increased. And blue light promotes the most amount of dopamine secreted by the retina compared with white light and green light. And in the influence of white light, green light and blue light under the same frequency condition on the development of the eye axis, the eye axis of the blue light group is obviously increased less than that of the white light group and the green light group. Blue light is able to promote dopamine secretion to the greatest extent, which is likely to inhibit the growth of the ocular axis through the pathway of dopamine regulation of the sclera.
To this end, in another alternative embodiment of the present application, it may further include:
setting the focal power as the focal power corresponding to correcting a projection picture formed by watching green light waves by a user with myopia and ametropia; after the projection light outputted by the projection light source is outputted through the first coupling-out structure, blue light in the projection light is imaged in front of retina of a user, green light is imaged on retina of the user, and red light is imaged behind retina of the user;
optionally, the first coupling-out structure in the coupling-out element has a diffraction efficiency for projection light in the blue band range that is greater than for projection light in other visible light waveguides.
It should be noted that, the set optical power in the embodiment is optical power corresponding to correction of a projection image formed by viewing a green light wave by a user with myopia and ametropia, which means that when a green light ray in the projection light ray passes through a first coupling-out structure on a first coupling-out area in the coupling-out element, the first coupling-out structure can enable the green light ray to image on a retina of the user with myopia and ametropia; that is, the imaging picture of green light can be clearly seen; on this basis, since the red wavelength and the blue wavelength are different from the green wavelength, for the first coupling-out structure (specifically, a holographic element with a set optical power in the first coupling-out structure) capable of imaging the green wavelength on the retina of the user, the red light wave can be imaged at the rear position of the retina, and the blue light wave can be imaged at the front position of the retina; therefore, a red, green and blue longitudinal color difference picture is formed, and different defocus signals caused by the red, green and blue longitudinal color difference trigger eyes to start different adjusting actions so as to adjust the length of an eye axis and the thickness of a choroid membrane, thereby finding the clearest retina image.
On the basis, the diffraction efficiency of the first coupling-out structure on projection light rays in the blue wave band range is higher than that of projection light rays in other visible light wave guide ranges, the myopia defocus signal generated by focusing light rays with blue light wavelengths in front of retina is enhanced, the myopia defocus signal generated by focusing light with blue light wavelengths in front of retina is stronger, further the eye axis growth is inhibited, and the myopia degree is prevented from being deepened.
In practical application, a red light coupling-in grating, a green light coupling-in grating and a blue light coupling-in grating which are respectively used for diffracting and coupling out three different color light waves of red light waves, green light waves and blue light waves can be arranged in the first coupling-out area; wherein the diffraction efficiency of the coupling-out grating for red light is lowest, the diffraction efficiency of the coupling-out grating for green light is inferior, and the diffraction efficiency of the coupling-out grating for blue light is highest.
Of course, it is also possible to directly set the highest light wave energy of the blue light wave output in the projection light source, while the light wave energy in other wave band ranges is relatively weaker, and embodiments of the present application can also be implemented.
In addition, further considering that since the red light has a warm effect, the red light laser irradiates on the retina of the user, the choroid behind the retina is also affected by the red light laser, and through the light effect, the blood microcirculation of the fundus is improved, the secretion of dopamine by the retinal pigment epithelial cells is promoted, and thus the thinned choroid is restored to normal; in addition, by continuous irradiation of red light, sufficient oxygen can be supplied to the sclera, thereby strengthening the strength of the reinforcing membrane, and finally, by irradiation of red light, the effect of inhibiting abnormal growth of the ocular axis can be achieved, thereby achieving the effect of relieving the myopia condition. To this end, in another alternative embodiment of the present application, it may further include:
the projection light source is used for switching and outputting a first projection light ray and a second projection light ray with different laser powers; wherein, the laser power of the first projection light is 1.5-3mW, the wavelength is 647 nm-660 nm, and the incident laser power is not more than 0.39mW.
It should be noted that, the first projection light in the embodiment is a red light capable of improving the health condition of human eyes to a certain extent, and the power of the incident laser of the red light is the power of the incident laser of the red light when the red light is diffracted and coupled out to the human eyes through the coupling-out element 3 after being transmitted through the waveguide element 1. The power should not be too high to avoid burning eyes, should not be too low to avoid increasing blood circulation, and in practical application, the power can be determined based on repeated experiments, and the application is not particularly limited.
The second projection light in this embodiment is the color light normally required for projection display for the user. In practical applications, the projection light source may alternately output the first projection light, for example, when the user starts to use the near-eye display device, the projection light source outputs the first projection light for three minutes and then normally outputs the second projection light, so that the user can normally watch the projection image. When the user watches the projection picture for too long, fatigue is easy to generate, the first projection light can be switched and output again.
In addition, the projection light source can be connected with the processor, the processor is connected with the light switch, and a user can manually switch the type of projection light output by the projection light source according to the light switch. The processor can be connected with mobile terminals such as mobile phones and tablet computers, and a user can manually select and switch the types of the output projection light on the mobile terminals.
Further, it is considered that the near-eye display device is in different environments, and the degree to which the laser power of the first projection light beam finally incident on the human eye may be lost is different, so in practical application, the first projection light beam output by the projection light source may be red light beam with adjustable laser power, for example, if the ambient temperature is low, the output laser power of the red light beam may be slightly increased, and if the ambient temperature is high, the output laser power of the red light beam may be appropriately reduced, and so on. That is, the red light outputted by the projection light source can be switched among a plurality of different laser powers so as to ensure that the power of the red light entering the eye is more proper.
Based on the above discussion, the purpose of improving the health of human eyes by illuminating eyes of a user with red light is not limited to the purpose of switching different projection light sources. In another alternative embodiment of the present application, it may further include:
a red light emitter for outputting red light with a wavelength of 650nm into the eye of a wearer, the incident laser power not greater than 0.39mW.
In this embodiment, a red light emitter for directly outputting red light to human eyes is additionally disposed on the near-eye display device, and the red light emitter may be fixed on the waveguide element, so long as the sight of human eyes is not affected, and may also be disposed on other structural components similar to those for supporting and connecting the waveguide element, which is not particularly limited in the present application.
Compared with the first projection light output by the projection light source, the red light emitter in the embodiment directly outputs red light to human eyes, and the light energy loss is smaller, so that the output power of the red light output by the red light emitter in the embodiment can be smaller, and the requirement can be met only by ensuring that the power of the incident light can be met.
In summary, in the near-eye display device of the present application, on the basis that the near-eye projection display can be realized by using the waveguide element and the projection light source, the coupling-out element is divided into the first coupling-out structure and the second coupling-out structure; and the first out-coupling structure has a set optical power and the second out-coupling structure does not have optical power, or the first out-coupling structure does not have optical power and the second out-coupling structure has optical power opposite to the set optical power. Finally, the projection light coupled out by the first coupling-out structure can be imaged on the retina of a wearer with refractive errors, so that the wearer can see a clear projection picture; the projection light coupled out by the second coupling-out structure is imaged at a position deviated from the retina of the wearer, so that the problem of further deepening the degree of refractive error of the wearer is solved, and the gradual recovery of the refractive error of the wearer can be facilitated. Therefore, the method can meet the requirement that the wearer can watch various projection pictures normally and simultaneously is beneficial to relieving the ametropia of the wearer, and the electronic equipment is used and the vision health is improved.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is inherent to. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. In addition, the parts of the above technical solutions provided in the embodiments of the present application, which are consistent with the implementation principles of the corresponding technical solutions in the prior art, are not described in detail, so that redundant descriptions are avoided.
The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present application and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the application can be made without departing from the principles of the application and these modifications and adaptations are intended to be within the scope of the application as defined in the following claims.
Claims (7)
1. A near-eye display device comprising a waveguide element; a projection light source for outputting projection light; a coupling-in element for coupling the projection light into the waveguide element for total reflection transmission; a coupling-out element for coupling out the projection light transmitted by total internal reflection in the waveguide element;
the coupling-out element at least comprises a first coupling-out structure corresponding to the first coupling-out area and a second coupling-out structure corresponding to the second coupling-out area;
the first coupling-out structure of the coupling-out element has a set optical power; the set optical power is the optical power corresponding to the correction of the ametropia of the user;
or, the second out-coupling structure of the out-coupling element has an optical power opposite to the set optical power;
the set focal power is corresponding focal power for correcting a projection picture formed by watching green light waves by a user with myopia and ametropia; after the projection light rays output by the projection light source are output through the first coupling-out structure, blue light rays in the projection light rays are imaged in front of retina of the user, green light rays are imaged on retina of the user, and red light rays are imaged behind retina of the user; wherein the first out-coupling structure is a holographic element;
the projection light source is used for switching and outputting at least a first projection light ray and a second projection light ray; wherein the laser power of the first projection light is 1.5-3mW, the wavelength is 647-660 nm, and the laser power for entering eyes is not more than 0.39mW;
or, the infrared transmitter is used for outputting the laser light with the wavelength of 650nm to eyes of a wearer, and the power of the laser light entering the eyes is not more than 0.39mW.
2. The near-eye display device of claim 1 wherein when the first out-coupling structure of the out-coupling element has a set optical power;
the coupling-out element comprises a coupling-out grating covering the first coupling-out region and the second coupling-out region, and a first holographic optical element which is arranged corresponding to the first coupling-out region in a fitting way; wherein the first holographic optical element has a set optical power.
3. A near-eye display device as claimed in claim 2, further comprising a second holographic optical element arranged in a conforming manner on the outcoupling grating at a position corresponding to the second outcoupling area.
4. A near-eye display device as claimed in claim 1, characterized in that when the second out-coupling structure of the out-coupling element has an optical power opposite to the set optical power;
the coupling-out element comprises a coupling-out grating covering the first coupling-out region and the second coupling-out region, and the coupling-out grating is attached to a second holographic optical element arranged corresponding to the second coupling-out region;
wherein the second holographic optical element is an element having an optical power opposite to the set optical power.
5. The near-eye display device of any one of claims 2 to 4, wherein the out-coupling grating comprises a first out-coupling grating, a second out-coupling grating, and a third out-coupling grating, stacked in order;
the first coupling-out grating, the second coupling-out grating and the third coupling-out grating are respectively used for diffracting projection light rays in different wavelength ranges.
6. The near-eye display device of claim 1 wherein when the first out-coupling structure of the out-coupling element has a set optical power;
the coupling-out element comprises a first holographic optical element arranged in the first coupling-out region and a second holographic optical element arranged in the second coupling-out region; wherein the first holographic optical element has the set optical power.
7. A near-eye display device as claimed in claim 1, characterized in that the second outcoupling region is a ring-shaped region centered on the first outcoupling region.
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