Field lens, display device and electronic equipment

Abstract

Embodiments of the present application provide a field lens, a display device and an electronic device. The field lens comprises a plurality of converging gratings corresponding to a plurality of waveband lights respectively and a plurality of pre-biased gratings corresponding to the plurality of waveband lights respectively. The plurality of converging gratings corresponding to the plurality of waveband lights respectively and the plurality of pre-biased gratings corresponding to the plurality of waveband lights respectively comprise a first waveband light converging grating and a first waveband light pre-biased grating. The first waveband light converging grating and the first waveband light pre-biased grating are both reflective gratings, and the first waveband light pre-biased grating is arranged on a side of the first waveband light converging grating away from a light entrance surface of the field lens. By using reflective gratings as the pre-biased gratings and the converging gratings corresponding to at least the waveband lights, the number of transmissive gratings in the field lens is reduced, so that external light incident from the light exit surface of the field lens does not need to be transmitted multiple times before being reflected back to the light exit surface of the field lens. Therefore, the occurrence of transmission diffraction can be significantly reduced, and the display effect of the display device provided by the field lens can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, and particularly relates to a field lens, a display device and an electronic equipment. BACKGROUND

[0002] With the development of computer technology and display technology, virtual reality (VR) technology for experiencing virtual world through computer simulation system, augmented reality (AR) technology for fusing display content into real environment background, mixed reality (MR) technology and naked-eye three-dimensional display technology have developed rapidly.

[0003] The development of the above technologies depends on the reliability of the display performance of the display device, and the display device required by the above technologies usually needs to be provided with a field lens to converge light for display. The multiple gratings in the field lens can cause the external light incident to the display device to be reflected and transmitted multiple times, and finally form chaotic diffraction fringes, affecting the display performance of the display device.

[0004] CONTENT

[0005] Therefore, the embodiments of the present application provide a field lens, a display device and an electronic equipment to solve the above problems.

[0006] In a first aspect, the embodiments of the present application provide a field lens, comprising a plurality of converging gratings corresponding to a plurality of waveband lights respectively and a plurality of pre-biased gratings corresponding to the plurality of waveband lights respectively.

[0007] Among the plurality of converging gratings corresponding to the plurality of waveband lights respectively and the plurality of pre-biased gratings corresponding to the plurality of waveband lights respectively, there are a first waveband light converging grating and a first waveband light pre-biased grating; the first waveband light converging grating and the first waveband light pre-biased grating are both reflective gratings, and the first waveband light pre-biased grating is arranged on a side of the first waveband light converging grating away from an incident surface of the field lens.

[0008] In an implementation manner of the first aspect, the first waveband light pre-biased grating is arranged on a side of other converging gratings and other pre-biased gratings in the field lens away from the incident surface of the field lens.

[0009] In an implementation manner of the first aspect, among the plurality of converging gratings corresponding to the plurality of waveband lights respectively and the plurality of pre-biased gratings corresponding to the plurality of waveband lights respectively, there are a second waveband light converging grating and a second waveband light pre-biased grating; the second waveband light converging grating and the second waveband light pre-biased grating are both transmissive gratings, and the second waveband light pre-biased grating is arranged on a side of the second waveband light converging grating close to the incident surface of the field lens.

[0010] In an implementation form of the first aspect, the wavelength range of the first waveband light is greater than the wavelength range of the second waveband light.

[0011] In an implementation form of the first aspect, the converging gratings and the pre-tilt gratings corresponding to the plurality of waveband lights are all reflective gratings, and the pre-tilt gratings corresponding to the same waveband light are arranged on the side of the converging gratings away from the light entrance surface of the field lens.

[0012] In an implementation form of the first aspect, the field lens is configured to receive red light, blue light and green light, and the converging gratings corresponding to the plurality of waveband lights further include a second waveband light converging grating and a third waveband light converging grating, and the pre-tilt gratings corresponding to the plurality of waveband lights further include a second waveband light pre-tilt grating and a third waveband light pre-tilt grating.

[0013] The first waveband light, the second waveband light and the third waveband light are different in color, and the first waveband light, the second waveband light and the third waveband light are one of red light, blue light and green light, respectively.

[0014] In an implementation form of the first aspect, the first waveband light is red light.

[0015] In an implementation form of the first aspect, the pre-tilt angle range of the first waveband light pre-tilt grating is [37°, 43°].

[0016] In an implementation form of the first aspect, the second waveband light is green light, and the pre-tilt angle range of the second waveband light pre-tilt grating is [67°, 73°].

[0017] In an implementation form of the first aspect, the third waveband light is blue light, and the pre-tilt angle range of the third waveband light pre-tilt grating is [27°, 33°].

[0018] In a second aspect, the embodiments of the present application provide a display device, comprising the light emitting module and the field lens provided in the first aspect; the field lens is arranged on the side of the light emitting module away from the light emitting surface and is configured to emit a plurality of waveband lights; the field lens comprises converging gratings and pre-tilt gratings corresponding to the plurality of waveband lights.

[0019] In an implementation form of the second aspect, the converging gratings and the pre-tilt gratings corresponding to the plurality of waveband lights include a first waveband light converging grating and a first waveband light pre-tilt grating; the first waveband light converging grating and the first waveband light pre-tilt grating are both reflective gratings, and the first waveband light pre-tilt grating is arranged on the side of the first waveband light converging grating away from the light emitting module.

[0020] In an implementation form of the second aspect, the first waveband light pre-tilt grating is disposed on a side of the second waveband light focusing grating distal to the light emitting module.

[0021] In an implementation form of the second aspect, the second waveband light focusing grating and the second waveband light pre-tilt grating are both transmissive gratings, and the second waveband light pre-tilt grating is disposed on a side of the second waveband light focusing grating proximal to the light emitting module.

[0022] In an implementation form of the second aspect, the first waveband light has a wavelength range greater than a wavelength range of the second waveband light.

[0023] In an implementation form of the second aspect, the plurality of waveband light focusing gratings and the plurality of waveband light pre-tilt gratings included in the field lens are both reflective gratings; and among the focusing grating and the pre-tilt grating corresponding to the same waveband light, the pre-tilt grating is disposed on a side of the focusing grating distal to the light emitting module.

[0024] In an implementation form of the second aspect, the light emitting module is configured to emit red light, blue light and green light to the field lens; the plurality of waveband light focusing gratings further comprises a second waveband light focusing grating and a third waveband light focusing grating, and the plurality of waveband light pre-tilt gratings further comprises a second waveband light pre-tilt grating and a third waveband light pre-tilt grating.

[0025] The first waveband light, the second waveband light and the third waveband light are different in color, and the first waveband light, the second waveband light and the third waveband light are one of red light, blue light and green light, respectively.

[0026] In an implementation form of the second aspect, the first waveband light is red light.

[0027] In an implementation form of the second aspect, a pre-tilt angle range of the first waveband light pre-tilt grating is [37°, 43°].

[0028] In an implementation form of the second aspect, the second waveband light is green light, and a pre-tilt angle range of the second waveband light pre-tilt grating is [67°, 73°].

[0029] In an implementation form of the second aspect, the third waveband light is blue light, and a pre-tilt angle range of the third waveband light pre-tilt grating is [27°, 33°].

[0030] In an implementation form of the second aspect, the display device further comprises:

[0031] A spatial light modulator is arranged between the light emitting module and the field lens.

[0032] In an implementation form of the second aspect, the display device further includes:

[0033] A polarizer is arranged on a side of the field lens away from the light emitting module.

[0034] In a third aspect, an electronic device is provided, which includes the display device provided in the second aspect.

[0035] In the embodiments of the present application, by using a reflective grating as the pre-biased grating and the converging grating corresponding to at least a waveband of light, the number of reflective gratings in the field lens is increased, and the number of transmissive gratings in the field lens is reduced. Since the number of transmissive gratings in the field lens is reduced, the external light incident from the light exit surface side of the field lens needs to be reflected back to the light exit surface of the field lens after being transmitted multiple times, which can significantly reduce the occurrence of transmission diffraction and improve the display effect of the display device in which the field lens is provided. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0037] Figure 1 An application scenario of a field lens provided in the embodiments of the present application;

[0038] Figure 2 An application scenario of a field lens provided in the embodiments of the present application;

[0039] Figure 3 An application scenario of a field lens provided in the embodiments of the present application;

[0040] Figure 4 A schematic diagram of a field lens provided in the embodiments of the present application;

[0041] Figure 5 A schematic diagram of a field lens provided in the embodiments of the present application;

[0042] Figure 6 A schematic diagram of a field lens provided in the embodiments of the present application;

[0043] Figure 7 A schematic diagram of a display device provided in the embodiments of the present application;

[0044] Figure 8A schematic diagram of a display device provided in an embodiment of this application;

[0045] Figure 9 A schematic diagram of a display device provided in an embodiment of this application;

[0046] Figure 10 A schematic diagram of a display device provided in an embodiment of this application;

[0047] Figure 11 This is a schematic diagram of a display device provided in an embodiment of this application.

Detailed Implementation Methods

[0048] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0049] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0050] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0051] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0052] In the description of this specification, it should be understood that the terms "substantially", "approximately", "about", "about", "generally", "largely" used in the claims and embodiments of this application refer to values ​​that can be generally agreed upon within a reasonable range of process operations or tolerances, rather than a precise value.

[0053] It should be understood that although the terms first, second, third, etc., may be used to describe wavelengths of light in the embodiments of this application, these wavelengths of light should not be limited to these terms. These terms are only used to distinguish wavelengths of light from one another. For example, without departing from the scope of the embodiments of this application, first wavelength light may also be referred to as second wavelength light, and similarly, second wavelength light may also be referred to as first wavelength light.

[0054] The applicant of the case provides a solution through careful and in-depth research on the problems existing in the prior art.

[0055] Figure 1 An application scenario of the field lens provided by the embodiment of the application, Figure 2 An application scenario of the field lens provided by the embodiment of the application, Figure 3 An application scenario of the field lens provided by the embodiment of the application.

[0056] As Figures 1-3 shown, the embodiment of the application provides a field lens, which can be applied to a display device 001. The main role of the field lens in the display device 001 is to adjust the propagation direction of the light received by the display device 001. Specifically, the display device 001 containing the field lens provided by the embodiment of the application can be applied to a head-up display device as Figure 1 shown, a near-eye display device as Figure 2 shown, a naked-eye three-dimensional display device as Figure 3 shown, and the like. The display device 001 applying the field lens provided by the embodiment of the application can specifically realize virtual reality display, augmented reality display, holographic projection display, and the like.

[0057] Figure 4 A schematic diagram of the field lens provided by the embodiment of the application.

[0058] As Figure 4 shown, the field lens 01 provided by the embodiment of the application includes a plurality of converging gratings 20 corresponding to a plurality of waveband lights respectively and a plurality of pre-deflection gratings 10 corresponding to the plurality of waveband lights respectively, that is, the field lens 01 includes a plurality of converging gratings 20 corresponding to a plurality of waveband lights respectively and the field lens 01 includes a plurality of pre-deflection gratings 10 corresponding to the plurality of waveband lights respectively.

[0059] For example, the field lens 01 can include a first waveband light converging grating 21 and a first waveband light pre-deflection grating 11 corresponding to first waveband light L1, a second waveband light converging grating 22 and a second waveband light pre-deflection grating 12 corresponding to second waveband light L2, and a third waveband light converging grating 23 and a third waveband light pre-deflection grating 13 corresponding to third waveband light L3.

[0060] It should be noted that the first waveband light L1, the second waveband light L2, and the third waveband light L3 are different colors of light corresponding to different wavelength ranges, for example, one of the first waveband light L1, the second waveband light L2, and the third waveband light L3 is red light with a wavelength range of 760nm-622nm, one is green light with a wavelength range of 577nm-492nm, and one is blue light with a wavelength range of 450nm-435nm.

[0061] It needs to be further explained that the pre-deflection grating 10 corresponding to a certain waveband light can make the light of the waveband deflected, and the converging grating 20 corresponding to a certain waveband light can make the light of the waveband converge. For example, the first waveband light pre-deflection grating 11 can make the first waveband light L1 incident to the first waveband light pre-deflection grating 11 deflected, the second waveband light pre-deflection grating 12 can make the second waveband light L2 incident to the second waveband light pre-deflection grating 12 deflected, and the third waveband light pre-deflection grating 13 can make the third waveband light L3 incident to the third waveband light pre-deflection grating 13 deflected; the first waveband light converging grating 21 can make the first waveband light L1 incident to the first waveband light converging grating 21 converge, the second waveband light converging grating 22 can make the second waveband light L2 incident to the second waveband light converging grating 22 converge, and the third waveband light converging grating 23 can make the third waveband light L3 incident to the third waveband light converging grating 23 converge.

[0062] The display light L0 received by the light entrance surface of the field lens 01 can be deflected by a certain angle by the pre-deflection grating 10 first, and then converged by the converging grating 20. The role of the pre-deflection grating is to deflect the light vertically incident by a certain angle, so as to avoid the light vertically incident on the converging grating and unable to be deflected and converged by the converging grating. Therefore, the field lens 01 including the pre-deflection grating 10 and the converging grating 20 has a better adjustment effect on the light propagation direction.

[0063] It needs to be explained that the light entrance surface of the field lens 01 is a surface of the field lens 01 for receiving the display light L0, and the light exit surface of the field lens 01 is a surface of the field lens 01 for emitting the display light L0.

[0064] In the embodiments of the present application, at least the first waveband light converging grating 21 and the first waveband light pre-deflection grating 11 in the plurality of converging gratings 20 and the plurality of pre-deflection gratings 10 included in the field lens 01 are reflective gratings, and the first waveband light pre-deflection grating 11 is arranged on the side of the first waveband light converging grating 21 away from the light entrance surface of the field lens 01. That is, in the field lens 01 provided in the embodiments of the present application, the pre-deflection grating 10 and the converging grating 20 corresponding to the light of at least one waveband are reflective gratings; among the pre-deflection grating 10 and the converging grating 20 corresponding to the light of the same waveband and being reflective gratings, the pre-deflection grating 10 is arranged on the side of the converging grating 20 away from the light entrance surface of the field lens 01.

[0065] As shown in FIG. 1, the field lens 01 includes a plurality of pre-deflection gratings 10 and a plurality of converging gratings 20. Figure 4As shown, the first waveband light L1 in the display light L0 received by the light entrance surface of the field lens 01 is first transmitted to the first waveband light pre-deflection grating 11, and since the first waveband light pre-deflection grating 11 is a reflective grating, the first waveband light L1 is reflected by the first waveband light pre-deflection grating 11 and then transmitted to the first waveband light converging grating 21. The first waveband light L1 is deflected while being reflected at the first waveband light pre-deflection grating 11, and is further deflected while being reflected at the first waveband light converging grating 21 and then converges.

[0066] In addition, by adjusting the grating orientation angle in the first waveband light pre-deflection grating 11 and the grating orientation angle in the first waveband light converging grating 21, the first waveband light L1 in the display light L0 incident on the light entrance surface of the field lens 01 is first transmitted through the first waveband light converging grating 21, then transmitted to the first waveband light pre-deflection grating 11 and reflected, and the first waveband light L1 is transmitted to the first waveband light converging grating 21 after being reflected at the first waveband light pre-deflection grating 11 and then converges at the first waveband light converging grating 21, and the first waveband light L1 is transmitted at the first waveband light pre-deflection grating 11 after converging at the first waveband light converging grating 21.

[0067] In an embodiment of the present application, when the pre-deflection grating 10 and the converging grating 20 corresponding to a certain waveband light are both reflective gratings, the waveband light in the display light L0 incident on the light entrance surface of the field lens 01 is first transmitted through the waveband light converging grating 20, then transmitted to the pre-deflection grating 10, deflected, and then reflected to the waveband light converging grating 20, and the waveband light is further deflected at the converging grating 20 and then converges and exits as converging light.

[0068] Since the gratings in the field lens 01 have the selection characteristics of the angle and wavelength of the light, if the external light L0' incident on the light exit surface side of the field lens 01 is transmitted and reflected at multiple gratings in the field lens 01, the diffraction fringes will present a chaotic rainbow pattern, thereby affecting the display effect of the display device 001 in which the field lens 01 is located.

[0069] In an embodiment of the present application, by using reflective gratings as at least the pre-deflection grating 10 and the converging grating 20 corresponding to a certain waveband light, the field lens 01 is provided with reflective gratings, and the reflective gratings can replace at least part of the transmissive gratings, thereby reducing the number of transmissive gratings in the field lens 01. Since the number of transmissive gratings in the field lens 01 is reduced, the external light L0' incident on the light exit surface side of the field lens 01 does not need to be transmitted multiple times and then reflected back to the light exit surface of the field lens 01, so that the occurrence of transmission diffraction can be significantly reduced, and the display effect of the display device 001 in which the field lens 01 is located can be improved.

[0070] In an embodiment of the present application, as shown in FIG. 1, the field lens 01 is provided with a plurality of gratings, and each grating is provided with a plurality of grating lines. Figure 4As shown, the first waveband light pre-polarization grating 11 is arranged on the side of the other converging gratings 20 and the pre-polarization gratings 10 in the field lens 01 away from the light entrance surface of the field lens 01. It can be understood that the first waveband light pre-polarization grating 11 is the grating closest to the light exit surface side of the field lens 01 among the plurality of pre-polarization gratings 10 and the plurality of converging gratings 20 included in the field lens 01.

[0071] Since the first waveband light pre-polarization grating 11 is a reflective grating, part of the wavebands of the external light L0' incident from the light exit surface side of the field lens 01 will be reflected at the first waveband light pre-polarization grating 11, further reducing the number of times that at least part of the wavebands of the external light L0' incident from the light exit surface side of the field lens 01 are transmitted through the gratings, thereby weakening the rainbow stripe phenomenon caused by transmission diffraction.

[0072] In addition, since at least part of the wavebands of the external light L0' are reflected at the first grating encountered after being incident into the field lens 01, the number of times that the wavebands of the external light L0' are reflected and transmitted is significantly reduced, and the problem of polarization state change of the wavebands of the external light L0' due to Fresnel effect is significantly improved. When the polarization state of the external light L0' incident into the field lens 01 is controllable, the external light L0' reflected by the gratings can be filtered out by using a polarizer, so that even if the external light L0' causes diffraction stripes, the diffraction stripes can also be filtered out by the polarizer.

[0073] In some technical solutions corresponding to the embodiment, the wavelength range of the first waveband light L1 in the display light L0 incident into the field lens 01 from the light entrance surface side of the field lens 01 is greater than the wavelength range of other waveband lights, that is, the first waveband light pre-polarization grating 11 can reflect the first waveband light L1 with a greater wavelength range. Since the first waveband light pre-polarization grating 11 is arranged on the side of the other converging gratings 20 and the pre-polarization gratings 10 in the field lens 01 away from the light entrance surface of the field lens 01, the first waveband light pre-polarization grating 11 can directly reflect the first waveband light L1 in the external light L0' incident from the light exit surface side of the field lens 01, that is, reflect the light with a greater wavelength range in the external light L0' incident from the light exit surface side of the field lens 01.

[0074] Figure 5 A schematic diagram of a field lens provided in an embodiment of the present application.

[0075] In an embodiment of the present application, as shown in Figure 5As shown, the plurality of converging gratings 20 included in the field lens 01 further includes a second waveband light converging grating 22, and the plurality of pre-deflection gratings 10 included in the field lens 01 further includes a second waveband light pre-deflection grating 12. The second waveband light converging grating 22 and the second waveband light pre-deflection grating 12 are both transmission gratings, and the second waveband light pre-deflection grating 12 is arranged on the side of the second waveband light converging grating 22 close to the light entrance surface of the field lens 01. That is, in the field lens 01 provided in this embodiment, the pre-deflection grating 10 and the converging grating 20 corresponding to at least one waveband of light are transmission gratings; among the pre-deflection grating 10 and the converging grating 20 which are transmission gratings and correspond to light of the same waveband, the pre-deflection grating 10 is arranged on the side of the converging grating 20 close to the light entrance surface of the field lens 01.

[0076] As shown in FIG. 1, the field lens 01 receives the display light L0 incident from the light entrance surface side thereof, and the display light L0 is transmitted to the pre-deflection gratings 10 and the converging gratings 20 included in the field lens 01. Figure 5 As shown, the second waveband light L2 in the display light L0 received by the field lens 01 and incident from the light entrance surface side thereof is first transmitted to the second waveband light pre-deflection grating 12, and since the second waveband light pre-deflection grating 12 is a transmission grating, the second waveband light L2 is transmitted to the second waveband light converging grating 22 after being transmitted by the second waveband light pre-deflection grating 12. The second waveband light L2 is deflected while being transmitted at the second waveband light pre-deflection grating 12, and is further deflected and converged while being transmitted at the second waveband light converging grating 22.

[0077] That is, in the present embodiment, when the pre-deflection grating 10 and the converging grating 20 corresponding to a waveband of light are both transmission gratings, the light of the waveband in the display light L0 incident to the field lens 01 from the light entrance surface side thereof is deflected at the pre-deflection grating 10 and then transmitted to the converging grating 20, and the light is further deflected and converged at the converging grating 20 and then exits.

[0078] In the present embodiment, the field lens 01 includes both pre-deflection gratings 10 and converging gratings 20 which are reflection gratings and pre-deflection gratings 10 and converging gratings 20 which are transmission gratings. In one technical solution corresponding to the present embodiment, the wavelength range of the light corresponding to at least one pre-deflection grating 10 which is a reflection grating included in the field lens 01 is greater than the wavelength range of the light corresponding to at least one pre-deflection grating 10 which is a transmission grating included in the field lens 01. By replacing only part of the transmission gratings in the field lens 01 with reflection gratings, the design difficulty of the field lens does not increase too much.

[0079] For example, the first waveband light pre-deflection grating 11 and the first waveband light converging grating 21 corresponding to the first waveband light L1 are both reflection gratings, and the second waveband light pre-deflection grating 12 and the second waveband light converging grating 22 corresponding to the second waveband light L2 are both transmission gratings, and the wavelength range of the first waveband light L1 can be greater than the wavelength range of the second waveband light L2.

[0080] When the wavelength range of the light of one waveband is large and the pre-deflection grating 10 corresponding to the light is a reflective grating, the pre-deflection grating 10 can reflect more external light L0' incident from the light exit surface side of the field lens 01.

[0081] Further, the wavelength range of the light of one waveband corresponding to the at least one reflective pre-deflection grating 10 included in the field lens 01 is larger than the wavelength range of the light of all the wavebands corresponding to the transmissive pre-deflection gratings 10. That is, among the multiple wavebands corresponding to the multiple pre-deflection gratings 10 included in the field lens 01, the pre-deflection grating 10 corresponding to the waveband with the largest wavelength range and the condensing grating 20 are both reflective gratings. For example, since the first waveband light condensing grating 21 and the first waveband light pre-deflection grating 11 are both reflective gratings, the first waveband light L1 can be the light with the largest wavelength range among the display light L0 incident from the light exit surface side of the field lens 01.

[0082] Further, among the multiple wavebands corresponding to the multiple pre-deflection gratings 10 included in the field lens 01, the pre-deflection grating 10 corresponding to the waveband with the largest wavelength range is disposed on the side away from the light exit surface of the field lens 01 of the other condensing gratings 20 and pre-deflection gratings 10.

[0083] Figure 6 A schematic diagram of a field lens according to an embodiment of the present application.

[0084] In one embodiment of the present application, as shown in Figure 6 the condensing gratings 20 and the pre-deflection gratings 10 corresponding to the multiple wavebands included in the field lens 01 are both reflective gratings, that is, the condensing gratings 20 and the pre-deflection gratings 10 included in the field lens 01 are both reflective gratings. Further, among the condensing gratings 20 and the pre-deflection gratings 10 corresponding to the same waveband, the pre-deflection grating 10 is disposed on the side away from the light exit surface of the field lens 01 of the condensing grating 20.

[0085] For example, as shown in Figure 6 the first waveband light pre-deflection grating 11 and the first waveband light condensing grating 21 are both reflective gratings, and the first waveband pre-deflection grating 10 is disposed on the side away from the light exit surface of the field lens 01 of the first waveband light condensing grating 21; the second waveband light pre-deflection grating 12 and the second waveband light condensing grating 22 are both reflective gratings, and the second waveband pre-deflection grating 10 is disposed on the side away from the light exit surface of the field lens 01 of the second waveband light condensing grating 22; and the third waveband light pre-deflection grating 13 and the third waveband light condensing grating 23 are both reflective gratings, and the third waveband pre-deflection grating 10 is disposed on the side away from the light exit surface of the field lens 01 of the third waveband light condensing grating 23.

[0086] Further, the pre-deflection gratings 10 in the field lens 01 are located on the side away from the light converging gratings 20 of the light incident surface of the field lens 01. For example, the first waveband light pre-deflection grating 11 is arranged on the side away from the light incident surface of the field lens 01 of the first waveband light converging grating 21, the second waveband light converging grating 22 and the third waveband light converging grating 23; the second waveband light pre-deflection grating 12 is arranged on the side away from the light incident surface of the field lens 01 of the first waveband light converging grating 21, the second waveband light converging grating 22 and the third waveband light converging grating 23; and the third waveband light pre-deflection grating 13 is arranged on the side away from the light incident surface of the field lens 01 of the first waveband light converging grating 21, the second waveband light converging grating 22 and the third waveband light converging grating 23.

[0087] In an embodiment of the present application, the multiple waveband lights in the display light L0 incident from the light incident surface side of the field lens 01 correspond to the first waveband light converging grating 21, the second waveband light converging grating 22 and the third waveband light converging grating 23 in the light converging gratings 20, and the multiple waveband lights in the display light L0 incident from the light incident surface side of the field lens 01 correspond to the first waveband light pre-deflection grating 11, the second waveband light pre-deflection grating 12 and the third waveband light pre-deflection grating 13 in the pre-deflection gratings 10. The first waveband light L1, the second waveband light L2 and the third waveband light L3 are different in color, and the first waveband light L1, the second waveband light L2 and the third waveband light L3 are one of red light, blue light and green light respectively.

[0088] That is, the display light L0 received by the light incident surface of the field lens 01 can include red light, blue light and green light according to the embodiment of the present application, and the multiple pre-deflection gratings 10 included in the field lens 01 can respectively pre-deflect the red light, the blue light and the green light, and the multiple light converging gratings 20 included in the field lens 01 can respectively converge the pre-deflected red light, blue light and green light.

[0089] In a corresponding technical solution of the embodiment, the first waveband light L1 is red light, that is, the first waveband light pre-deflection grating 11 is used for pre-deflecting the red light in the display light L0 incident from the light incident surface of the field lens 01, and the first waveband light converging grating 21 is used for converging the red light in the display light L0 incident from the light incident surface of the field lens 01.

[0090] Therefore, in the technical solution, the pre-deflection grating 10 for deflecting the red light in the display light L0 incident from the light incident surface of the field lens 01 and the light converging grating 20 for converging the red light are both reflective gratings. Since the wavelength range of the red light is wider than that of the blue light and the green light, the first waveband light pre-deflection grating 11 can reflect more wavelength range of light in the external light L0' incident from the light emitting surface side of the field lens 01.

[0091] Further, in the technical solution, the first waveband pre-deflection grating 10 can be arranged on the side of the field lens 01 away from the light incident surface of the field lens 01 and away from the other converging grating 20 and the pre-deflection grating 10.

[0092] Further, when the first waveband light L1 is red light, the pre-deflection angle range of the first waveband pre-deflection grating 11 can be [37°, 43°], for example, can be 40°. The grating period of the first waveband pre-deflection grating 11 can be 1029 nm.

[0093] Optionally, the second waveband light L2 can be green light, the second waveband pre-deflection grating 12 is configured to pre-deflect the green light in the display light L0 incident from the light incident surface side of the field lens 01, and the second waveband converging grating 22 is configured to converge the green light in the display light L0 incident from the light incident surface side of the field lens 01. The pre-deflection angle range of the second waveband pre-deflection grating 12 can be [67°, 73°], for example, can be 70°. The grating period of the second waveband pre-deflection grating 12 can be 478 nm.

[0094] Optionally, the third waveband light L3 can be blue light, the third waveband pre-deflection grating 13 is configured to pre-deflect the blue light in the display light L0 incident from the light incident surface side of the field lens 01, and the third waveband converging grating 23 is configured to converge the blue light in the display light L0 incident from the light incident surface side of the field lens 01. The pre-deflection angle range of the third waveband pre-deflection grating 13 can be [27°, 33°]. For example, can be 30°. The grating period of the third waveband pre-deflection grating 13 can be 836 nm.

[0095] Figure 7 A schematic diagram of a display device provided by an embodiment of the present application.

[0096] As shown in Figure 7 The display device 001 provided by the embodiment of the present application includes a light emitting module 02 and a field lens 01, the field lens 01 is arranged on the light emitting surface side of the light emitting module 02, and the light emitting module 02 is configured to emit a plurality of waveband lights to the field lens 01. That is, in the display device 001 provided by the embodiment of the present application, the light emitting module 02 is arranged on the light incident surface side of the field lens 01, and the light emitting module 02 is mainly configured to emit display light L0 to the field lens 01, and the field lens 01 is mainly configured to adjust the propagation direction of the light incident from the light incident surface thereof.

[0097] Specifically, the display device 001 provided by the embodiment of the present application can be applied to a display device 001 as shown in

[0098] Specifically, the display device 001 provided by the embodiment of the present application can be applied to a display device 001 as shown inFigure 1 The head-up display device, the near-eye display device, the naked-eye three-dimensional display device, etc. Figure 2 The head-up display device, the near-eye display device, the naked-eye three-dimensional display device, etc. Figure 3 The display device 001 provided by the embodiments of the present application can realize virtual reality display, augmented reality display, holographic projection display, etc.

[0099] The field lens 01 includes a plurality of converging gratings 20 corresponding to a plurality of wavebands of light respectively and a plurality of pre-deflection gratings 10 corresponding to the plurality of wavebands of light respectively, wherein the plurality of converging gratings 20 corresponding to the plurality of wavebands of light respectively and the plurality of pre-deflection gratings 10 corresponding to the plurality of wavebands of light respectively include a first waveband light converging grating 21 and a first waveband light pre-deflection grating 11.

[0100] The first waveband light converging grating 21 and the first waveband light pre-deflection grating 11 are both reflective gratings, and the first waveband light pre-deflection grating 11 is arranged on a side of the first waveband light converging grating 21 away from the light-emitting module 02. Then, the first waveband light L1 in the display light L0 emitted by the light-emitting module 02 to the field lens 01 first transmits through the first waveband light converging grating 21 and then is transmitted to the first waveband light pre-deflection grating 11 to be deflected and then is reflected to the first waveband light converging grating 21, and the first waveband light L1 is further deflected and converged at the first waveband light converging grating 21 to be emitted.

[0101] In the embodiments of the present application, the field lens 01 in the display device 001 adopts reflective gratings as the pre-deflection gratings 10 and the converging gratings 20 corresponding to at least the waveband of light, thereby increasing the number of reflective gratings in the field lens 01 and reducing the number of transmissive gratings in the field lens 01. Since the number of transmissive gratings in the field lens 01 is reduced, the external light L0' incident on the light-emitting surface of the field lens 01 needs to be transmitted multiple times and then reflected back to the light-emitting surface of the field lens 01, thereby obviously reducing the transmission and diffraction on the light-emitting surface of the field lens 01 and improving the display effect of the display device 001 provided by the embodiments of the present application.

[0102] In one embodiment of the present application, as shown in Figure 7 The first waveband light pre-deflection grating 11 is arranged on a side of other converging gratings 20 and pre-deflection gratings 10 in the field lens 01 away from the light-emitting module 02. It can be understood that the first waveband light pre-deflection grating 11 is the grating in the field lens 01 farthest away from the light-emitting module 02, i.e., the first waveband pre-deflection grating 10 is the grating in the field lens 01 closest to the light-emitting surface of the field lens 01.

[0103] Since the first waveband light pre-deflection grating 11 is a reflection grating, the external light L0' incident from the light exit side of the field lens 01 will be reflected at the first waveband light pre-deflection grating 11 when incident to the field lens 01, so that the number of times of transmission of at least part of the waveband of the external light L0' incident from the light exit side of the field lens 01 through the grating is further reduced, thereby reducing the rainbow phenomenon caused by transmission diffraction.

[0104] In addition, since at least part of the waveband of the external light is reflected at the first grating encountered after being incident to the field lens 01, the number of times of reflection of the external light of the waveband is significantly reduced, and the problem of polarization state change of the external light L0' due to Fresnel effect is significantly improved. When the polarization state of the external light L0' incident to the field lens 01 is controllable, the external light L0' reflected by the grating can be filtered out by using a polaroid, so that the diffraction fringes caused by the external light can be filtered out by the polaroid.

[0105] Figure 8 A schematic diagram of a display device according to an embodiment of the present application.

[0106] In some embodiments of the present application, as shown in Figure 8 The second waveband light pre-deflection grating 12 is a transmission grating, and the second waveband light pre-deflection grating 12 is arranged on the side of the second waveband light converging grating 22 close to the light emitting module 02, i.e., the second waveband light pre-deflection grating 12 is arranged on the side of the second waveband light converging grating 22 close to the light entrance side of the field lens 01.

[0107] In the embodiment of the present application, the second waveband light L2 in the display light L0 emitted by the light emitting module 02 to the field lens 01 is transmitted to the second waveband light converging grating 22 after being deflected at the second waveband light pre-deflection grating 12, and the second waveband light L2 is emitted after being further deflected and converged at the second waveband light converging grating 22.

[0108] Further, the wavelength range of the first waveband light L1 is greater than the wavelength range of the second waveband light L2.

[0109] Figure 9 A schematic diagram of a display device according to an embodiment of the present application.

[0110] In one embodiment of the present application, as shown in Figure 9As shown, the converging gratings 20 corresponding to the multiple waveband lights respectively comprised by the field lens 01 and the pre-deflection gratings 10 respectively corresponding to the multiple waveband lights are all reflective gratings; and in the converging gratings 20 and the pre-deflection gratings 10 corresponding to the same waveband light, the pre-deflection grating 10 is arranged on the side of the converging grating 20 away from the light-emitting module 02.

[0111] For example, as shown in the figure, Figure 9 As shown, the first waveband light pre-deflection grating 11 and the first waveband light converging grating 21 are both reflective gratings and the first waveband pre-deflection grating 10 is arranged on the side of the first waveband light converging grating 21 away from the light-emitting module 02; the second waveband light pre-deflection grating 12 and the second waveband light converging grating 22 are both reflective gratings and the second waveband pre-deflection grating 10 is arranged on the side of the second waveband light converging grating 22 away from the light-emitting module 02; the third waveband light pre-deflection grating 13 and the third waveband light converging grating 23 are both reflective gratings and the third waveband pre-deflection grating 10 is arranged on the side of the third waveband light converging grating 23 away from the light-emitting module 02.

[0112] In an embodiment of the present application, the converging gratings 20 corresponding to the multiple waveband lights in the display light L0 emitted by the light-emitting module 02 to the field lens 01 comprise the first waveband light converging grating 21, the second waveband light converging grating 22 and the third waveband light converging grating 23, and the pre-deflection gratings 10 corresponding to the multiple waveband lights in the display light L0 emitted by the light-emitting module 02 to the field lens 01 comprise the first waveband light pre-deflection grating 11, the second waveband light pre-deflection grating 12 and the third waveband light pre-deflection grating 13. The first waveband light L1, the second waveband light L2 and the third waveband light L3 emitted by the light-emitting module 02 to the field lens 01 are different in color, and the first waveband light L1, the second waveband light L2 and the third waveband light L3 are each one of red light, blue light and green light.

[0113] For example, the light-emitting module 02 can specifically be a laser emission module that emits red laser, green laser and blue laser.

[0114] In a technical solution corresponding to the embodiment, the first waveband light L1 is red light, i.e. the first waveband light pre-deflection grating 11 is used to pre-deflect the red light in the display light L0 emitted by the light-emitting module 02 to the field lens 01 and the first waveband light converging grating 21 is used to converge the red light in the display light L0 emitted by the light-emitting module 02 to the field lens 01.

[0115] Further, when the first waveband light L1 is red light, the pre-deflection angle range of the first waveband light pre-deflection grating 11 can be [37°, 43°], for example, can be 40°. The grating period of the first waveband light pre-deflection grating 11 can be 1029 nm.

[0116] Optionally, the second waveband light L2 can be green light, the second waveband light pre-deflection grating 12 is used for pre-deflecting the green light in the display light L0 emitted by the light emitting module 02 to the field lens 01, and the second waveband light converging grating 22 is used for converging the green light in the display light L0 emitted by the light emitting module 02 to the field lens 01. The pre-deflection angle range of the second waveband light pre-deflection grating 12 can be [67°, 73°], for example, can be 70°. The grating period of the second waveband light pre-deflection grating 12 can be 478 nm.

[0117] Optionally, the third waveband light L3 can be blue light, the third waveband light pre-deflection grating 13 is used for pre-deflecting the blue light in the display light L0 emitted by the light emitting module 02 to the field lens 01, and the third waveband light converging grating 23 is used for converging the blue light in the display light L0 emitted by the light emitting module 02 to the field lens 01. The pre-deflection angle range of the third waveband light pre-deflection grating 13 can be [27°, 33°]. For example, can be 30°. The grating period of the third waveband light pre-deflection grating 13 can be 836 nm.

[0118] It should be noted that the field lens 01 in the display device 001 provided by the embodiment of the present application can be the field lens 01 provided by any one of the above-mentioned embodiments, which will not be described here.

[0119] Figure 10 A schematic diagram of a display device provided by an embodiment of the present application.

[0120] As shown in Figure 10 , the display device 001 provided by an embodiment of the present application further includes a polaroid 03, the polaroid 03 is arranged on the side of the field lens 01 away from the light emitting module 02, that is, the polaroid 03 is arranged on the light emitting side of the field lens 01. By arranging the polaroid 03 on the light emitting side of the field lens 01, the amount of light of the external light L0' incident to the field lens 01 from the light emitting side of the field lens 01 can be reduced, and the generation of diffraction fringes can be reduced. In addition, the polaroid 03 can reduce the amount of light of the external light L0' incident to the field lens 01 and then emitted from the light emitting side of the field lens 01 and perceived by the human eye.

[0121] Figure 11 A schematic diagram of a display device provided by an embodiment of the present application.

[0122] As shown in Figure 11 , the display device 001 provided by an embodiment of the present application further includes a spatial light modulator 04, the spatial light modulator 04 is arranged between the light emitting module 02 and the field lens 01, that is, the display light L0 emitted by the light emitting module 02 passes through the modulation of the spatial light modulator 04 and then is transmitted to the field lens 01. Specifically, the spatial light modulator 04 can be used to modulate the phase and amplitude of the display light L0 emitted by the light emitting module 02.

[0123] The embodiment of the present application further provides an electronic device comprising the display device provided by any one of the above-mentioned embodiments. Specifically, the electronic device provided by the embodiment of the present application can be one of a head-up display device as shown in Figure 1 , a near-eye display device as shown in Figure 2 , a naked-eye three-dimensional display device as shown in Figure 3 , and the like, and can realize virtual reality display, augmented reality display, holographic projection display and the like.

[0124] The above merely provides the preferred embodiments of the present application, but should not be used to limit the present application, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A field lens characterized in that, The multiple waveband lights respectively correspond to the converging gratings and the pre-biased gratings respectively; the multiple waveband lights are different colors of light corresponding to different wavelength ranges respectively; The multiple waveband lights include first waveband light, and the multiple waveband lights respectively correspond to the converging gratings and the pre-biased gratings respectively, including the first waveband light converging grating and the first waveband light pre-biased grating; the first waveband light converging grating is used for converging the first waveband light incident to the first waveband light converging grating; the first waveband light converging grating and the first waveband light pre-biased grating are both reflective gratings, and the first waveband light pre-biased grating is arranged on the side of the first waveband light converging grating away from the light entrance surface of the field lens; The first waveband light pre-biased grating is arranged on the side of the field lens away from the light entrance surface of the field lens, and the other converging gratings and the other pre-biased gratings are arranged on the side of the field lens close to the light entrance surface of the field lens. The wavelength range of the first waveband light is greater than the wavelength range of the other waveband light. The multiple waveband lights include second waveband light, and the multiple waveband lights respectively correspond to the converging gratings and the pre-biased gratings respectively, including the second waveband light converging grating and the second waveband light pre-biased grating; the second waveband light converging grating and the second waveband light pre-biased grating are both transmissive gratings, and the second waveband light pre-biased grating is arranged on the side of the second waveband light converging grating close to the light entrance surface of the field lens.

2. A field lens characterized in that, The multiple waveband lights respectively correspond to the converging gratings and the pre-biased gratings respectively; the multiple waveband lights are different colors of light corresponding to different wavelength ranges respectively; The multiple waveband lights include first waveband light, and the multiple waveband lights respectively correspond to the converging gratings and the pre-biased gratings respectively, including the first waveband light converging grating and the first waveband light pre-biased grating; the first waveband light converging grating is used for converging the first waveband light incident to the first waveband light converging grating; the first waveband light converging grating and the first waveband light pre-biased grating are both reflective gratings, and the first waveband light pre-biased grating is arranged on the side of the first waveband light converging grating away from the light entrance surface of the field lens; The first waveband light pre-biased grating is arranged on the side of the field lens away from the light entrance surface of the field lens, and the other converging gratings and the other pre-biased gratings are arranged on the side of the field lens close to the light entrance surface of the field lens. The wavelength range of the first waveband light is greater than the wavelength range of the other waveband light. The multiple waveband lights include second waveband light, and the multiple waveband lights respectively correspond to the converging gratings and the pre-biased gratings respectively, including the second waveband light converging grating and the second waveband light pre-biased grating; the second waveband light converging grating and the second waveband light pre-biased grating are both transmissive gratings, and the second waveband light pre-biased grating is arranged on the side of the second waveband light converging grating close to the light entrance surface of the field lens. The first waveband light pre-biased grating is arranged on the side of the first waveband light converging grating and the second waveband light converging grating away from the light entrance surface of the field lens, and the second waveband light pre-biased grating is arranged on the side of the first waveband light converging grating and the second waveband light converging grating away from the light entrance surface of the field lens.

3. The field lens of claim 2, wherein, The converging gratings corresponding to the multiple waveband lights and the pre-biased gratings corresponding to the multiple waveband lights are all reflective gratings; and in the converging grating and the pre-biased grating corresponding to the same waveband light, the pre-biased grating is arranged on the side of the converging grating away from the light entrance surface of the field lens.

4. Field lens according to claim 1 or 2, characterized in that The field lens is used for receiving red light, blue light and green light; the multiple waveband lights include third waveband light, the converging gratings corresponding to the multiple waveband lights further include third waveband light converging gratings, and the pre-biased gratings corresponding to the multiple waveband lights further include third waveband light pre-biased gratings. The colors of the first waveband light, the second waveband light and the third waveband light are different, and the first waveband light, the second waveband light and the third waveband light are one of red light, blue light and green light respectively.

5. The field lens of claim 4, wherein, The first waveband light is red light.

6. The field lens of claim 5, wherein, The pre-biased angle range of the first waveband light pre-biased grating is [37°, 43°].

7. The field lens of claim 4, wherein, The second waveband light is green light, and the pre-biased angle range of the second waveband light pre-biased grating is [67°, 73°].

8. The field lens of claim 4, wherein, The third waveband light is blue light, and the pre-biased angle range of the third waveband light pre-biased grating is [27°, 33°].

9. A display device comprising: The field lens is used for receiving red light, blue light and green light; the multiple waveband lights include third waveband light, the converging gratings corresponding to the multiple waveband lights further include third waveband light converging gratings, and the pre-biased gratings corresponding to the multiple waveband lights further include third waveband light pre-biased gratings. The colors of the first waveband light, the second waveband light and the third waveband light are different, and the first waveband light, the second waveband light and the third waveband light are one of red light, blue light and green light respectively. The first waveband light is red light. The pre-biased angle range of the first waveband light pre-biased grating is [37°, 43°]. The second waveband light is green light, and the pre-biased angle range of the second waveband light pre-biased grating is [67°, 73°].

10. A display device, characterized by comprising: The third waveband light is blue light, and the pre-biased angle range of the third waveband light pre-biased grating is [27°, 33°]. The field lens is used for receiving red light, blue light and green light; the multiple waveband lights include third waveband light, the converging gratings corresponding to the multiple waveband lights further include third waveband light converging gratings, and the pre-biased gratings corresponding to the multiple waveband lights further include third waveband light pre-biased gratings. The colors of the first waveband light, the second waveband light and the third waveband light are different, and the first waveband light, the second waveband light and the third waveband light are one of red light, blue light and green light respectively. The multiple waveband lights include first waveband light, and the multiple waveband lights correspond to multiple focusing gratings and multiple pre-deflection gratings respectively, wherein the multiple waveband lights correspond to first waveband light focusing grating and first waveband light pre-deflection grating respectively; the first waveband light focusing grating is configured to converge the first waveband light incident on the first waveband light focusing grating; the first waveband light focusing grating and the first waveband light pre-deflection grating are both reflective gratings, and the first waveband light pre-deflection grating is arranged on the side of the first waveband light focusing grating away from the light emitting module; The first waveband light pre-deflection grating is arranged on the side of the field lens away from the other focusing gratings and pre-deflection gratings of the field lens. The wavelength range of the first waveband light is greater than the wavelength range of other waveband lights. The multiple waveband lights include second waveband light, and the multiple waveband lights correspond to multiple focusing gratings and multiple pre-deflection gratings respectively, wherein the multiple waveband lights correspond to second waveband light focusing grating and second waveband light pre-deflection grating respectively; the second waveband light focusing grating and the second waveband light pre-deflection grating are both reflective gratings, and the second waveband light pre-deflection grating is arranged on the side of the second waveband light focusing grating away from the light entrance surface of the field lens. The first waveband light pre-deflection grating is arranged on the side of the first waveband light focusing grating and the second waveband light focusing grating away from the light entrance surface of the field lens, and the second waveband light pre-deflection grating is arranged on the side of the first waveband light focusing grating and the second waveband light focusing grating away from the light entrance surface of the field lens.

11. The display device according to claim 10, wherein The multiple waveband lights correspond to multiple focusing gratings and multiple pre-deflection gratings respectively, and the multiple focusing gratings and the multiple pre-deflection gratings are both reflective gratings; and for the same waveband light, the pre-deflection grating is arranged on the side of the focusing grating away from the light emitting module.

12. The display device according to claim 9 or 10, wherein The light emitting module is configured to emit red light, blue light and green light to the field lens; the multiple waveband lights include third waveband light, and the multiple waveband lights correspond to multiple focusing gratings and multiple pre-deflection gratings respectively, wherein the multiple waveband lights correspond to third waveband light focusing grating and third waveband light pre-deflection grating respectively. The first waveband light, the second waveband light and the third waveband light are different in color, and the first waveband light, the second waveband light and the third waveband light are one of red light, blue light and green light respectively.

13. The display device of claim 12, wherein, The first waveband light is red light.

14. The display device of claim 13, wherein, The pre-deflection angle range of the first waveband light pre-deflection grating is [37°, 43°].

15. The display device of claim 12, wherein, The second waveband light is green light, and the pre-deflection angle range of the second waveband light pre-deflection grating is [67°, 73°].

16. The display device of claim 12, wherein, The third waveband light is blue light, and the pre-deflection angle range of the third waveband light pre-deflection grating is [27°, 33°].

17. The display device according to claim 9 or 10, wherein The display device further comprises: A spatial light modulator arranged between the light emitting module and the field lens.

18. The display device according to claim 9 or 10, wherein The display device further comprises: A polarizer arranged on the side of the field lens away from the light emitting module.

19. An electronic device, comprising: The display device comprises the display device according to any one of claims 9-18. The display device comprises the display device according to any one of claims 9-18.

Images