CN211014865U - Near-to-eye display device - Google Patents
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- CN211014865U CN211014865U CN202020050366.0U CN202020050366U CN211014865U CN 211014865 U CN211014865 U CN 211014865U CN 202020050366 U CN202020050366 U CN 202020050366U CN 211014865 U CN211014865 U CN 211014865U
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Abstract
The utility model discloses a near-to-eye display device, including display screen and imaging system, imaging system includes: the display screen comprises a biconvex lens, a plane semi-transparent semi-reflective mirror and a curved surface semi-transparent semi-reflective mirror, wherein the biconvex lens is used for amplifying a display image of the display screen, the plane semi-transparent semi-reflective mirror is used for receiving imaging light rays of the biconvex lens and reflecting the imaging light rays to the curved surface semi-transparent semi-reflective mirror, and the curved surface semi-transparent semi-reflective mirror is used for converging the imaging light rays and reflecting the imaging light rays to the position of. The plane half-transmitting half-reflecting mirror and the curved surface half-transmitting half-reflecting mirror have the function of turning back light, and the whole volume of the near-to-eye display device is favorably reduced. The imaging system adopts the biconvex lens and the curved surface half-transmitting and half-reflecting mirror, so that the three curved surfaces can be optimized, the imaging quality of the imaging system is improved, more imaging devices are prevented from being introduced for optimizing parameters, the using number of the lenses is reduced on the whole, the structure of the imaging system is simplified, and the whole weight of the near-to-eye display device is reduced.
Description
Technical Field
The utility model relates to a show technical field, especially relate to a near-to-eye display device.
Background
With the recent continuous development of Virtual Reality (VR) and Augmented Reality (AR) technologies, near-eye display products are being widely used in civil fields such as movies, education, and medical treatment from the beginning of military fields. Because the image source of the near-eye display product is very small, the image can be clearly imaged within the range observable by human eyes by setting the image source at a position close to the human eyes. This poses a great difficulty in designing a near-eye display device.
The current near-eye display device is large in size and heavy, so that a viewer wears the near-eye display device with great pressure, and the problem of wearing discomfort often occurs. Simplifying the design of a near-eye display device to reduce the weight of the near-eye display device causes problems of poor imaging quality and small field of view.
SUMMERY OF THE UTILITY MODEL
The utility model provides a display device for.
The utility model provides a display device, include:
a display screen for displaying an image;
the imaging system is positioned on the light emitting side of the display screen and is used for imaging the display image of the display screen at the position of human eyes;
wherein the imaging system comprises:
the lenticular lens is positioned on the light emitting side of the display screen;
the plane semi-transmitting and semi-reflecting mirror is positioned on one side of the biconvex lens, which is far away from the display screen;
the curved surface semi-transparent semi-reflecting mirror is positioned on a reflection light path of the plane semi-transparent semi-reflecting mirror;
the connecting line of the optical center of the biconvex lens and the optical center of the plane half-transmitting half-reflecting mirror is intersected with the connecting line of the optical center of the plane half-transmitting half-reflecting mirror and the optical center of the curved surface half-transmitting half-reflecting mirror;
the lenticular lens is used for amplifying a display image of the display screen, the planar semi-transparent mirror is used for receiving imaging light rays of the lenticular lens and reflecting the imaging light rays to the curved surface semi-transparent mirror, and the curved surface semi-transparent mirror is used for converging the imaging light rays and reflecting the imaging light rays to the position where human eyes are located.
In a possible implementation manner, in the above display device provided by the present invention, the display screen is located within one focal length of the imaging system.
In one possible implementation manner, in the above display device provided by the present invention, the exit pupil distance of the imaging system is greater than 18 mm.
In a possible implementation manner, in the above display device provided by the present invention, a distance between an optical center of the lenticular lens and an optical center of the planar half mirror is 7mm to 10 mm.
In a possible implementation manner, in the above display device provided by the present invention, a distance between an optical center of the planar half mirror and an optical center of the curved half mirror is 8mm to 11 mm.
In a possible implementation manner, the present invention provides an above display device, wherein the optical center of the lenticular lens is perpendicular to the line connecting the optical center of the plane half mirror and the optical center of the curved surface half mirror.
In a possible implementation manner, in the above display device provided by the present invention, the two optical surfaces of the lenticular lens are spherical surfaces, odd-order aspheric surfaces, even-order aspheric surfaces, or free-form surfaces.
In a possible implementation manner, in the above display device provided by the present invention, both optical surfaces of the lenticular lens satisfy the following relationship:
where z represents the surface form equation of the optical surface, c represents the radius of curvature, k represents the conic coefficient, r represents the half aperture, α1、α2、α3、α4、α5Both represent coefficients.
In a possible implementation manner, the present invention provides the above display device, wherein the lenticular lens is close to the optical surface on one side of the display screen:
r＝-49.00863899098125mm；
k＝-95.04941082200814；
α1＝0；
α2＝-1.037904547482000×10-6；
α3＝-1.752251362999443×10-8；
α4＝7.636861093444737×10-11；
α5＝-4.351559618685465×10-13；
the optical surface of the side of the lenticular lens, which faces away from the display screen, meets the following conditions:
r＝14.05871803442135mm；
k＝-1.367399296176254；
α1＝0；
α2＝-6.706673225527226×10-5；
α3＝8.892596162790160×10-7；
α4＝2.719516289317158×10-9；
α5＝-2.562235658581397×10-11。
in a possible implementation manner, in the display device provided by the present invention, two optical surfaces of the curved surface half mirror are parallel to each other; the two optical surfaces of the curved surface semi-transparent semi-reflecting mirror are spherical surfaces, odd-order aspheric surfaces, even-order aspheric surfaces or free curved surfaces.
In a possible implementation manner, the present invention provides an above display device, wherein the two optical surfaces of the curved semi-transparent and semi-reflective mirror all satisfy the following relationships:
where z represents the surface form equation of the optical surface, c represents the radius of curvature, k represents the conic coefficient, r represents the half aperture, α1、α2、α3、α4、α5Both represent coefficients.
In a possible implementation manner, the utility model provides an in the above-mentioned display device, the optical surface of curved surface transflective mirror satisfies:
r＝-52.20409394488124mm；
k＝-1.604779554699603；
α1＝0；
α2＝-4.991846957838716×10-6；
α3＝2.130618444391338×10-8；
α4＝-1.601068438007377×10-10；
α5＝3.674816411704089×10-13。
in a possible implementation manner, in the above display device provided by the present invention, the surfaces of the planar half mirror and the curved half mirror are provided with optical films, and the ratio of light transmission to light reflection of the optical films is 4:6 to 5: 5.
In one possible implementation manner, in the display device provided by the present invention, the near-eye display device is glasses or a helmet;
the curved surface semi-transparent semi-reflecting mirror is reused as the lens of the glasses or the helmet.
The utility model discloses beneficial effect as follows:
the utility model provides a near-to-eye display device, include: a display screen for displaying an image; the imaging system is positioned on the light emitting side of the display screen and is used for imaging the display image of the display screen at the position of human eyes; wherein, imaging system includes: the lenticular lens is positioned on the light emergent side of the display screen; the plane semi-transmitting and semi-reflecting mirror is positioned on one side of the biconvex lens, which is far away from the display screen; the curved surface semi-transparent semi-reflecting mirror is positioned on a reflecting light path of the plane semi-transparent semi-reflecting mirror; the connecting line of the optical center of the biconvex lens and the optical center of the plane half-transmitting half-reflecting mirror is intersected with the connecting line of the optical center of the plane half-transmitting half-reflecting mirror and the optical center of the curved surface half-transmitting half-reflecting mirror; the lenticular lens is used for amplifying a display image of the display screen, the planar half-transmitting mirror is used for receiving imaging light rays of the lenticular lens and reflecting the imaging light rays to the curved surface half-transmitting mirror, and the curved surface half-transmitting mirror is used for converging the imaging light rays and reflecting the imaging light rays to the position where human eyes are located. The plane half-transmitting half-reflecting mirror and the curved surface half-transmitting half-reflecting mirror have the function of turning back light, so that the light path can be increased through reflection, a near-to-eye display device does not need to be designed according to the length of a light path, and the whole volume of the near-to-eye display device is favorably reduced. The imaging system adopts the biconvex lens and the curved surface half-transmitting and half-reflecting mirror, so that the three curved surfaces can be optimized to improve the imaging quality of the imaging system, avoid introducing more imaging devices for optimizing parameters, reduce the using number of the lenses on the whole, simplify the structure of the imaging system and reduce the whole weight of the near-to-eye display device.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a near-eye display device according to an embodiment of the present invention;
fig. 2 is a field curvature diagram of a near-eye display device according to an embodiment of the present invention;
fig. 3 is a distortion diagram of a near-eye display device according to an embodiment of the present invention;
fig. 4 is a grid distortion diagram of a near-to-eye display device according to an embodiment of the present invention;
fig. 5 is a graph of an optical transfer function of a near-eye display device according to an embodiment of the present invention;
fig. 6 is an external schematic view of a near-to-eye display device according to an embodiment of the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described with reference to the accompanying drawings and examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words for expressing the position and direction described in the present invention are all the explanations given by taking the drawings as examples, but can be changed according to the needs, and the changes are all included in the protection scope of the present invention. The drawings of the present invention are only for illustrating the relative positional relationship and do not represent true proportions.
A near-eye display device refers to a display apparatus worn on the eyes of a user, and for example, the near-eye display device is generally presented in the form of glasses or a helmet. Near-eye display devices may provide AR and VR experiences for users. In the AR near-eye display technology, a virtual image generated by a near-eye display device is displayed in a superimposed manner with a real image of the real world, so that a user can see a final enhanced real image from a screen. The VR near-eye display technology is to display images of the left and right eyes on near-eye displays corresponding to the left and right eyes, respectively, and the left and right eyes can synthesize stereoscopic vision in the brain after acquiring image information with differences, respectively.
Present near-to-eye display device still has bulky, and weight is big and the not good problem of imaging quality, the embodiment of the utility model provides a near-to-eye display device for alleviate complete machine weight, promote the imaging quality.
Fig. 1 is the utility model provides a near-to-eye display device's schematic structure diagram, as shown in fig. 1, the utility model provides a near-to-eye display device, include:
a display screen 100 for displaying images.
The display screen 100 serves as an image source for displaying images. The display panel 100 may be a liquid crystal display panel or an organic light emitting diode display panel, and is not limited herein. The display screen 100 of the near-eye display device is generally small in size, and is installed in the near-eye display device, and in the implementation, a display screen with higher resolution can be used, so that a display image with a finer picture can be provided.
The imaging system 200 is located on the light emitting side of the display screen 100, and is configured to image the display image of the display screen 100 at a position where human eyes are located.
The imaging system 200, which is indispensable in the near-eye display device, is located on the light-emitting side of the display screen 100, and is configured to image the display image of the display screen 100 at the position where the human eyes are located. A near-eye display device may include two display screens 100 and two sets of imaging systems 200, corresponding to the left and right eyes, respectively. The images displayed by the display screens corresponding to the left eye and the right eye can have some information differences, so that after the left eye and the right eye receive the corresponding images, the images can be synthesized in the brain to generate a stereoscopic visual effect.
Specifically, as shown in fig. 1, the imaging system 200 includes:
a lenticular lens 21 positioned at a light exit side of the display screen 100;
a planar half-mirror 22 located on a side of the lenticular lens 21 facing away from the display screen 100;
the curved half mirror 23 is located on the reflection light path of the planar half mirror 22.
Wherein, the connecting line of the optical center of the lenticular lens 21 and the optical center of the plane half mirror 22 intersects with the connecting line of the optical center of the plane half mirror 22 and the optical center of the curved surface half mirror 23.
The light emitted by the display screen 100 firstly enters the lenticular lens 21, the lenticular lens 21 is used for amplifying a display image, the light enters the plane half-transmitting half-reflecting mirror 22 after passing through the effect of the lenticular lens 21, the plane half-transmitting half-reflecting mirror 22 reflects the light to the curved surface half-transmitting half-reflecting mirror 23, the light is reflected and converged to one side of the plane half-transmitting half-reflecting mirror 22 through the reflection effect of the curved surface half-transmitting half-reflecting mirror 23, and finally the light penetrates through the plane half-transmitting half-reflecting mirror 23 to enter the position s where human eyes are located.
The plane half mirror 22 and the curved surface half mirror 23 have the function of turning back light, so that the light path can be increased through reflection, a near-eye display device does not need to be designed according to the length of a light path, and the whole volume of the near-eye display device is favorably reduced.
The imaging system 200 adopts the lenticular lens 22 and the curved semi-transparent mirror 23, so that the three curved surfaces can be optimized to improve the imaging quality of the imaging system, avoid introducing more imaging devices for optimizing parameters, and reduce the number of lenses on the whole, thereby simplifying the structure of the imaging system and reducing the overall weight of the near-eye display device.
In particular implementations, the display screen 100 may be placed within one focal length of the imaging system 200.
The display screen 100 is small in size in a near-eye display device, and cannot be directly observed by human eyes when the display screen with the small size is used for displaying rich image details. The display screen 100 may therefore be placed within one focal length of the imaging system 200 so that the imaging system may erect a magnified virtual image, magnifying the displayed image of the display screen 100 for human eye viewing of details in the displayed image.
The distance between the display screen 100 and the imaging system 200 can also be adjusted to influence the distance between the imaging positions. As the distance between the display screen 100 and the imaging system 200 decreases, the image is seen by the human eye farther; as the distance between the display screen 100 and the imaging system 200 increases, the image to be seen by the eye is closer. Therefore, in practical applications, the imaging position can be adjusted by adjusting the distance between the display screen 100 and the imaging system 200 to find the optimal imaging position.
As shown in fig. 1, the distance between the optical center of the imaging position s and the plane half mirror 22 is the exit pupil distance of the imaging system 200, in the embodiment of the present invention, the exit pupil distance of the imaging system 200 is greater than 18mm, so that the distance between the human eye and the near-to-eye display device is avoided too close, which is more convenient for the viewer to wear, and the optimization design.
In a specific implementation, as shown in fig. 1, a connection line between the optical center of the lenticular lens 21 and the optical center of the planar half mirror 22 is perpendicular to a connection line between the optical center of the planar half mirror 22 and the optical center of the curved half mirror 23. Taking the structure shown in fig. 1 as an example, when the display surface of the display screen 100 is vertically downward, the planar half mirror 22 may be disposed to be inclined by 45 degrees from the horizontal plane, and the curved half mirror 23 may be disposed to be vertical to the horizontal plane, so that a connection line between the optical center of the lenticular lens 21 and the optical center of the planar half mirror 22 is perpendicular to a connection line between the optical center of the planar half mirror 22 and the optical center of the curved half mirror 23, thereby simplifying the design of the optical path.
The distance between the optical center of the lenticular lens 21 and the optical center of the planar half mirror 22 refers to the distance between the center point of the optical surface of the side of the lenticular lens 21 facing away from the display screen 100 and the center point of the optical surface of the side of the planar half mirror 22 facing the lenticular lens 21. In the embodiment of the present invention, the distance between the optical center of the lenticular lens 21 and the optical center of the plane half mirror 22 is 7mm to 10mm, and when the value is 8.7mm to 8.8mm, the imaging effect is better.
As shown in fig. 1, the distance between the optical center of the planar half mirror 22 and the optical center of the curved half mirror 23 is a distance between the center of the optical surface of the planar half mirror 22 on the side facing the curved half mirror 23 and the center of the optical surface of the curved half mirror 23 on the side facing the planar half mirror 22. In the embodiment of the present invention, the distance between the optical center of the planar half mirror 22 and the optical center of the curved half mirror 23 is 8mm to 11mm, and when the value is 9.7mm to 9.8mm, the imaging effect is better.
The face type of each lens among the imaging system and the distance between each lens all can influence imaging quality, the embodiment of the utility model provides a many-sided factors such as field curvature, distortion and optics transfer function have been considered, the interval between each optical component has been confirmed to and each optical component's face type.
Specifically, the two optical surfaces of the lenticular lens 21 in the embodiment of the present invention may be any one of a spherical surface, an odd aspheric surface, an even aspheric surface, and a free-form surface. The aspheric lens has better imaging quality because the parameters that can be optimized are more comprehensive than the spherical lens.
In specific implementation, both optical surfaces of the lenticular lens 21 may be designed to be any one of an odd-order aspheric surface, an even-order aspheric surface, or a free-form surface. Odd-order aspheric surface is asymmetric aspheric surface, and even-order aspheric surface is symmetric aspheric surface, considers the processing degree of difficulty, the embodiment of the utility model provides a can be with two optical surface designs of biconvex lens 21 for even-order aspheric surface.
Specifically, both optical surfaces of the lenticular lens 21 may satisfy the following relationship:
wherein z represents the surface equation of the optical surface, c represents the radius of curvature, k represents the conic coefficient, and r representsSemi-pore size, α1、α2、α3、α4、α5Both represent coefficients.
The value of k can influence the surface profile of the optical surface, α1、α2、α3、α4、α5For the coefficients of the higher-order terms, the greater the number of the higher-order terms, the finer the design, and the imaging quality of the lenticular lens can be optimized by increasing the number of the higher-order terms when the optical design is performed.
Further, when the optical surface of the lenticular lens 21 close to the display screen 100 satisfies the above formula, the values of the parameters are as follows:
r＝-49.00863899098125mm；
k＝-95.04941082200814；
α1＝0；
α2＝-1.037904547482000×10-6；
α3＝-1.752251362999443×10-8；
α4＝7.636861093444737×10-11；
α5＝-4.351559618685465×10-13。
when the optical surface of the lenticular lens 21 on the side away from the display screen 100 satisfies the above formula, values of the parameters are as follows:
r＝14.05871803442135mm；
k＝-1.367399296176254；
α1＝0；
α2＝-6.706673225527226×10-5；
α3＝8.892596162790160×10-7；
α4＝2.719516289317158×10-9；
α5＝-2.562235658581397×10-11。
thereby, the optical design of both optical surfaces of the lenticular lens 21 is completed.
In the embodiment of the present invention, the two optical surfaces of the curved semi-transparent and semi-reflective mirror 23 are parallel to each other; the two optical surfaces of the curved half mirror 23 can be any one of a spherical surface, an odd-order aspheric surface, an even-order aspheric surface, or a free-form surface. The aspheric lens has better imaging quality because the parameters that can be optimized are more comprehensive than the spherical lens.
In specific implementation, the two optical surfaces of the curved half mirror 23 may be designed as any one of an odd-order aspheric surface, an even-order aspheric surface, or a free-form surface. Odd-order aspheric surface is asymmetric aspheric surface, and even-order aspheric surface is the symmetric aspheric surface, considers the processing degree of difficulty, the embodiment of the utility model provides a can be with two optical surface designs of curved surface semi-transparent half-reflecting mirror 23 for even-order aspheric surface.
Specifically, both optical surfaces of the curved half mirror 23 may satisfy the following relationship:
where z represents the surface form equation of the optical surface, c represents the radius of curvature, k represents the conic coefficient, r represents the half aperture, α1、α2、α3、α4、α5Both represent coefficients.
The value of k can influence the surface profile of the optical surface, α1、α2、α3、α4、α5The higher the number of the high-order terms, the finer the design is, and the imaging quality of the curved surface half-mirror can be optimized by increasing the number of the high-order terms when the optical design is performed.
Further, when the optical surface of the curved half mirror 23 satisfies the above formula, values of the parameters are as follows:
r＝-52.20409394488124mm；
k＝-1.604779554699603；
α1＝0；
α2＝-4.991846957838716×10-6；
α3＝2.130618444391338×10-8；
α4＝-1.601068438007377×10-10；
α5＝3.674816411704089×10-13。
thereby, the optical design of the two optical surfaces of the curved half mirror 23 is completed.
The parameter values of the optical surfaces of the lenticular lens 21 and the curved surface half-mirror 23 can be optimized according to the final performance of the imaging system in the aspects of field curvature, distortion, optical transfer function and the like, the surface types of the lenticular lens 21 and the curved surface half-mirror 23 and the distances among optical components can influence the imaging quality of the imaging system, and various factors need to be comprehensively considered when optical design is carried out.
When carrying out optical design, biconvex lens 21 and curved surface transflective mirror 23 also can choose odd aspheric surface or free-form surface for use, the embodiment of the utility model provides an only exemplify with the implementation of even aspheric surface, do not restrict the specific face type of biconvex lens 21 and curved surface transflective mirror 23. When the lenticular lens 21 and the curved half mirror 23 are of other types of surface types, the corresponding parameters should be reset.
The embodiment of the present invention further provides an imaging performance of the imaging system 200 in terms of field curvature, distortion, and optical transfer function when each optical component in the imaging system satisfies the above conditions.
Fig. 2 is a field curvature diagram of a near-eye display device according to an embodiment of the present invention, in which an abscissa represents a field curvature amount and an ordinate represents a viewing field height. The closer the field curvature of the imaging system at each field height is to 0, the better the imaging effect is. The field curvature in the sagittal direction and the meridional direction are shown in the field curvature diagram, wherein the dotted line represents the field curvature in the sagittal direction, the solid line represents the field curvature in the meridional direction, and different gray scales represent the field curvature of light rays with different wavelengths. As shown in fig. 2, the imaging system 200 provided by the embodiment of the present invention controls the field curvature within ± 0.1 after parameter optimization, the field curvature is smaller, and the imaging effect is good.
Fig. 3 is a distortion diagram of a near-eye display device according to an embodiment of the present invention, in which an abscissa represents a distortion amount and an ordinate represents a viewing field height. The closer the field curvature of the imaging system at each field height is to 0, the better the imaging effect is. Different gray scales in the distortion diagram represent the distortion amount of light with different wavelengths. As shown in fig. 3, the distortion of the imaging system 200 provided by the embodiment of the present invention is less than 2% after parameter optimization, the distortion is small, and the imaging effect is good.
Fig. 4 is the grid distortion diagram of the near-to-eye display device provided by the embodiment of the present invention, wherein, "×" represents the real imaging point, "· represents the ideal imaging point, as can be seen from fig. 3, the embodiment of the present invention provides an imaging system 200 after parameter optimization, the position difference between the real imaging point and the ideal imaging point is smaller, the network distortion is smaller than 1.4%, the distortion is smaller, and the imaging effect is better.
Fig. 5 is a graph of an optical Transfer Function of a near-eye display device according to an embodiment of the present invention, in which an abscissa represents a spatial frequency, and an ordinate represents a Modulation Transfer Function (MTF) value, which is an important parameter of a reactive optical system. The uppermost curve in fig. 5 indicates the diffraction limit corresponding to the viewing angle of 0, and the closer the MTF value at different viewing angles is to the uppermost curve indicates the better imaging effect of the imaging system. The optical transfer function graph shows MTF curves in sagittal and meridional directions, wherein a dotted line represents the MTF curve in the sagittal direction, a solid line represents the MTF curve in the meridional direction, and different grays represent the MTF curves of light rays with different wavelengths. As shown in fig. 5, after the imaging system 200 provided by the embodiment of the present invention is optimized through parameters, the optical transfer function of the full field of view is greater than 0.3 at 31lp/mm, and the optical transfer function of the full field of view is greater than 0.1 at 62lp/mm, which has better imaging performance.
In the specific processing procedure, the lenticular lens 21, the planar half mirror 22 and the curved half mirror 23 can be made of optical glass, resin, plastic or other materials, which are not limited herein.
Optical films are arranged on the surfaces of the planar half-mirror 22 and the curved half-mirror 23, and the ratio of light transmission to light reflection of the optical films is 4: 6-5: 5. The embodiment of the utility model provides an optical film utilizes the film to interfere the principle, through quantity of piles of adjustment optical film, the refracting index of material and thickness isoparametric, makes it have the effect of transmission or reflection. Adjusting the above parameters also controls the ratio of optical film light transmission to light reflection.
In practical use, the reflected light from the planar half mirror 22 is used for imaging, but the reflected light from the curved half mirror 23 finally passes through the planar half mirror 22 before entering the human eye, so the transmittance and reflectance of the planar half mirror 22 are comparable, and neither the reflected light nor the transmitted light is lost too much. When the curved surface half-mirror 23 is applied to the VR field, the reflectivity of the curved surface half-mirror 23 can be improved, so that more light rays are used for imaging; when the curved-surface half mirror 23 is applied to the AR field, ambient light needs to penetrate through the curved-surface half mirror 23 to participate in image synthesis, and at this time, the transmittance and reflectance of the curved-surface half mirror 23 need to be set reasonably. In the embodiment of the present invention, the ratio of light transmission and light reflection of the optical film on the surfaces of the planar half mirror 22 and the curved half mirror 23 can be controlled within the range of 4:6 to 5:5, so as to achieve a better imaging effect.
The embodiment of the utility model provides an above-mentioned near-to-eye display device can be glasses or helmet, can reuse the lens of glasses or helmet with curved surface semi-transparent and semi-reflective mirror 23 this moment to reduce the lens quantity that near-to-eye display device used. When the near-eye display device is a pair of glasses, the appearance diagram can be seen in fig. 6.
The embodiment of the utility model provides a near-to-eye display device, include: a display screen for displaying an image; the imaging system is positioned on the light emitting side of the display screen and is used for imaging the display image of the display screen at the position of human eyes; wherein, imaging system includes: the lenticular lens is positioned on the light emergent side of the display screen; the plane semi-transmitting and semi-reflecting mirror is positioned on one side of the biconvex lens, which is far away from the display screen; the curved surface semi-transparent semi-reflecting mirror is positioned on a reflecting light path of the plane semi-transparent semi-reflecting mirror; the connecting line of the optical center of the biconvex lens and the optical center of the plane half-transmitting half-reflecting mirror is intersected with the connecting line of the optical center of the plane half-transmitting half-reflecting mirror and the optical center of the curved surface half-transmitting half-reflecting mirror; the lenticular lens is used for amplifying a display image of the display screen, the planar half-transmitting mirror is used for receiving imaging light rays of the lenticular lens and reflecting the imaging light rays to the curved surface half-transmitting mirror, and the curved surface half-transmitting mirror is used for converging the imaging light rays and reflecting the imaging light rays to the position where human eyes are located. The plane half-transmitting half-reflecting mirror and the curved surface half-transmitting half-reflecting mirror have the function of turning back light, so that the light path can be increased through reflection, a near-to-eye display device does not need to be designed according to the length of a light path, and the whole volume of the near-to-eye display device is favorably reduced. The imaging system adopts the biconvex lens and the curved surface half-transmitting and half-reflecting mirror, so that the three curved surfaces can be optimized to improve the imaging quality of the imaging system, avoid introducing more imaging devices for optimizing parameters, reduce the using number of the lenses on the whole, simplify the structure of the imaging system and reduce the whole weight of the near-to-eye display device.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (14)
1. A near-eye display device, comprising:
a display screen for displaying an image;
the imaging system is positioned on the light emitting side of the display screen and is used for imaging the display image of the display screen at the position of human eyes;
wherein the imaging system comprises:
the lenticular lens is positioned on the light emitting side of the display screen;
the plane semi-transmitting and semi-reflecting mirror is positioned on one side of the biconvex lens, which is far away from the display screen;
the curved surface semi-transparent semi-reflecting mirror is positioned on a reflection light path of the plane semi-transparent semi-reflecting mirror;
the connecting line of the optical center of the biconvex lens and the optical center of the plane half-transmitting half-reflecting mirror is intersected with the connecting line of the optical center of the plane half-transmitting half-reflecting mirror and the optical center of the curved surface half-transmitting half-reflecting mirror;
the lenticular lens is used for amplifying a display image of the display screen, the planar semi-transparent mirror is used for receiving imaging light rays of the lenticular lens and reflecting the imaging light rays to the curved surface semi-transparent mirror, and the curved surface semi-transparent mirror is used for converging the imaging light rays and reflecting the imaging light rays to the position where human eyes are located.
2. The near-eye display device of claim 1, wherein the display screen is located within one focal length of the imaging system.
3. The near-eye display device of claim 1 wherein the imaging system has an exit pupil distance greater than 18 mm.
4. The near-eye display device of claim 1, wherein a distance between an optical center of the lenticular lens and an optical center of the planar half mirror is 7mm to 10 mm.
5. The near-eye display device of claim 4, wherein a distance between an optical center of the planar half mirror and an optical center of the curved half mirror is 8mm to 11 mm.
6. The near-eye display device of claim 1, wherein a line connecting an optical center of the lenticular lens and an optical center of the planar half mirror is perpendicular to a line connecting an optical center of the planar half mirror and an optical center of the curved half mirror.
7. The near-eye display device of claim 1, wherein both optical surfaces of the lenticular lens are spherical, odd-order aspheric, even-order aspheric, or free-form surfaces.
8. The near-eye display device of claim 7, wherein both optical surfaces of the lenticular lens satisfy the following relationship:
where z represents the surface form equation of the optical surface, c represents the radius of curvature, k represents the conic coefficient, r represents the half aperture, α1、α2、α3、α4、α5Both represent coefficients.
9. The near-eye display device of claim 8, wherein an optical surface of the lenticular lens on a side near the display screen satisfies:
r＝-49.00863899098125mm；
k＝-95.04941082200814；
α1＝0；
α2＝-1.037904547482000×10-6；
α3＝-1.752251362999443×10-8；
α4＝7.636861093444737×10-11；
α5＝-4.351559618685465×10-13；
the optical surface of the side of the lenticular lens, which faces away from the display screen, meets the following conditions:
r＝14.05871803442135mm；
k＝-1.367399296176254；
α1＝0；
α2＝-6.706673225527226×10-5；
α3＝8.892596162790160×10-7；
α4＝2.719516289317158×10-9；
α5＝-2.562235658581397×10-11。
10. the near-eye display device of claim 1, wherein the two optical surfaces of the curved half mirror are parallel to each other; the two optical surfaces of the curved surface semi-transparent semi-reflecting mirror are spherical surfaces, odd-order aspheric surfaces, even-order aspheric surfaces or free curved surfaces.
11. The near-eye display device of claim 10, wherein both optical surfaces of the curved transflector satisfy the relationship:
where z represents the surface form equation of the optical surface, c represents the radius of curvature, k represents the conic coefficient, r represents the half aperture, α1、α2、α3、α4、α5Both represent coefficients.
12. The near-eye display device of claim 11, wherein the curved half mirror has an optical surface satisfying:
r＝-52.20409394488124mm；
k＝-1.604779554699603；
α1＝0；
α2＝-4.991846957838716×10-6；
α3＝2.130618444391338×10-8；
α4＝-1.601068438007377×10-10；
α5＝3.674816411704089×10-13。
13. the near-eye display device according to any one of claims 1 to 12, wherein optical films are disposed on the surfaces of the planar half mirror and the curved half mirror, and the optical films have a ratio of light transmission to light reflection of 4:6 to 5: 5.
14. The near-eye display device of any one of claims 1-12, wherein the near-eye display device is glasses or a helmet;
the curved surface semi-transparent semi-reflecting mirror is reused as the lens of the glasses or the helmet.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965820A (en) * | 2020-08-07 | 2020-11-20 | 联想(北京)有限公司 | Optical structure and wearable equipment |
| WO2021139725A1 (en) * | 2020-01-10 | 2021-07-15 | 京东方科技集团股份有限公司 | Near-to-eye display apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021139725A1 (en) * | 2020-01-10 | 2021-07-15 | 京东方科技集团股份有限公司 | Near-to-eye display apparatus |
| CN111965820A (en) * | 2020-08-07 | 2020-11-20 | 联想(北京)有限公司 | Optical structure and wearable equipment |
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