WO2021077850A1

WO2021077850A1 - Display panel, near-eye display optical system, and head-mounted display device

Info

Publication number: WO2021077850A1
Application number: PCT/CN2020/107209
Authority: WO
Inventors: 朱璐璐; 罗诚; 邓焯泳
Original assignee: 华为技术有限公司
Priority date: 2019-10-21
Filing date: 2020-08-05
Publication date: 2021-04-29

Abstract

A display panel, a near-eye display optical system, and a head-mounted display device, relating to the technical field of smart wearable electronic devices. The display panel is disposed in a near-eye display optical system. The display panel comprises: a substrate; a self-luminescent pixel light source array; and a microlens array, the microlens array being disposed on the light-emitting side of the pixel light source array. After the light emitted by pixel light sources (11) passes through microlenses (2), and the central axis of the light-emitting angle coincides with the chief ray of the near-eye display optical system at the pixel light sources (11) or the included angle between the central axis and the chief ray is less than or equal to 5°; the pixel light source array and the microlens array are both integrated on the substrate.

Description

Display panel, near-eye display optical system and head-mounted display equipment

This application claims the priority of the Chinese patent application filed with the State Intellectual Property Office on October 21, 2019, the application number is 201911002097.9, and the invention title is "a display panel, near-eye display optical system and head-mounted display device", and requirements The priority of the Chinese patent application filed with the State Intellectual Property Office, the application number is 201911061361.6, and the invention title is "a display panel, near-eye display optical system and head-mounted display device" on November 1, 2019, the entire content of which is incorporated by reference Incorporated in this application.

Technical field

This application relates to the technical field of smart wearable electronic devices, and in particular to a display panel, a near-eye display optical system, and a head-mounted display device.

Background technique

In recent years, the application of Augmented Reality (AR) technology and Virtual Reality (VR) technology in smart wearable electronic devices has developed rapidly. Among them, the core components of augmented display technology and virtual display technology are the display optical system and the display optical system. The display effect directly determines the quality of the smart wearable electronic device. To make the smart wearable electronic device perform well, the display optical system needs to meet the technical requirements of high light efficiency and uniform screen brightness, and the smart wearable electronic device also needs to meet the small size Therefore, the display optical system must also be miniaturized.

However, it is difficult for the current display optical system to meet the requirements of small size, high luminous efficiency, and uniform brightness of the screen at the same time. Referring to Figure 1, the display screens currently used in the display optical system are mostly self-luminous displays, such as liquid crystal displays (Liquid Crystal Display, LCD), Organic Light-emitting Diode (Organic Light-emitting Diode, OLED), the central axis 002 of the solid angle A of the self-luminous display is perpendicular to the surface of the self-luminous display 001, referring to Figure 2, the light-emitting angle is different and the luminous intensity It is also different, that is, the farther away from the central axis 002, the lower the luminous intensity.

In order to pursue the effect of high light efficiency and uniform brightness of the picture, referring to Figure 3, the display optical system is usually designed as a telecentric optical system. The telecentric optical system means that the chief ray Q entering the lens group 003 is parallel to the optical axis of the entire optical system. The optical system, that is, the chief ray of the effective beam of the optical system coincides with the central axis of the luminous solid angle of the display screen, but the disadvantage of the telecentric optical system is: because the chief ray Q entering the lens group 003 needs to be aligned with the luminous solid angle of the display screen The central axis of the lens group 003 coincides, resulting in a larger volume of the lens group 003, which in turn causes a larger volume of the entire telecentric optical system; in order to obtain a smaller optical system, referring to Figure 4-A, the display optical system is usually designed to be non-telecentric Optical system, non-telecentric optical system refers to an optical system in which at least part of the chief ray Q entering the lens group 003 is not parallel to the optical axis of the entire optical system, that is, at least part of the chief ray Q of the effective light beam of the optical system and the display screen The central axis of the light-emitting solid angle has an included angle, the included angle is too large, and the included angles of different pixel positions are different, the included angle of the center pixel unit is 0°, the more the edge pixel unit, the larger the included angle, as shown in Figure 4-B As shown, the area of area M represents the brightness of the center of the screen, and the area of area N represents the brightness of the edge of the screen. Referring to Figure 5, this will cause the brightness of the effective light to decrease from the center pixel unit to the edge pixel unit. The final effect is The brightness of the center of the picture is high, and the brightness of the edge of the picture is low, which means that the picture brightness is uneven.

Therefore, small size, high luminous efficiency, and uniform brightness of the picture are not available for the current display optical system at the same time.

Summary of the invention

The embodiments of the present application provide a display panel, a near-eye display optical system, and a head-mounted display device, and the main purpose is to provide a near-eye display optical system that can achieve small size, high light efficiency, and uniform picture brightness.

In order to achieve the foregoing objectives, the embodiments of the present application adopt the following technical solutions:

In a first aspect, the present application provides a display panel, the display panel is configured to be installed in a near-eye display optical system, and the display panel includes:

Substrate

Pixel light source array that emits light spontaneously;

The microlens array is arranged on the light-emitting side of the pixel light source array. After the light emitted by the pixel light source passes through the microlens, the central axis of the light-emitting angle and the near-eye display optical system are on the main side of the pixel light source. The light rays coincide or the angle between the central axis and the chief ray is less than or equal to 5°;

Both the pixel light source array and the micro lens array are integrated on the substrate.

In the display panel provided by the embodiments of the present application, since the microlens array is arranged on the light-emitting side of the pixel light source array, when the light emitted by each pixel light source passes through the corresponding microlens, the central axis of its light-emitting angle can be aligned with the near-eye display optical system. The chief ray of the pixel light source is matched, that is, the central axis of the emission angle coincides with the chief ray or the angle between the two is less than or equal to 5°. If the display panel is applied to a near-eye display optical system, the near-eye display optical system can make full use of the light emitted by the pixel light source, thereby ensuring high light efficiency, and because the central axis of the luminous angle coincides with the chief ray or the sandwich between the two The angle is less than or equal to 5°, which can ensure that the brightness of the effective light is uniform from the center pixel light source to the edge pixel light source in the pixel light source array, thereby ensuring uniform brightness of the displayed picture. At the same time, the setting of the micro lens array can also effectively shorten the near eye The focal length of the display optical system reduces the volume of the entire near-eye display optical system.

In a possible implementation manner of the first aspect, the display screen is a liquid crystal display, an organic light emitting diode, or a micro light emitting diode array.

In a possible implementation manner of the first aspect, the microlenses in the microlens array are free-form surface lenses, spherical lenses, aspheric lenses, cylindrical lenses, or lenses with other structures.

In a possible implementation of the first aspect, the optical parameters of at least part of the microlenses in the microlens array are the same, or the optical parameters of every two microlenses in the microlens array are different. The selection of the optical parameters of the microlens is determined based on the value of the included angle between the central axis of the luminous angle emitted from the microlens and the chief ray of the pixel light source by the near-eye display optical system.

In the second aspect, the present application also provides a near-eye display optical system, including:

A display panel, the display panel being the display panel in the first aspect or any implementation of the first aspect;

An imaging lens group, the imaging lens group is arranged on the light exit side of the display panel.

The near-eye display optical system provided by the embodiments of the present application includes the display panel provided in the above-mentioned embodiments. After the light emitted by the pixel light source passes through the microlens, the central axis of the light emission angle coincides with the chief ray of the near-eye display optical system at the pixel light source. Or the included angle is less than or equal to 5°, that is to say, the light emitted by not only the edge pixel light source but also the center pixel light source in the pixel light source can effectively penetrate the imaging lens group, thereby ensuring high light efficiency and ultimately ensuring the displayed picture The brightness is uniform, avoiding the phenomenon of high brightness in the center of the picture and low brightness at the edges of the picture. Compared with the near-eye display optical system without microlenses in the prior art, the size of the imaging lens group can be effectively reduced, thereby reducing the entire The volume of the near-eye display optical system. At the same time, due to the setting of the microlens array, the optical system is designed as a non-telecentric optical system, which will also reduce the focal length of the entire near-eye display optical system and further reduce the volume to realize the near-eye display optical system. Miniaturization design requirements.

In a possible implementation manner of the second aspect, the lens group includes a plurality of lenses, and the plurality of lenses are arranged in sequence along the light path on the light exit side of the display panel, and the edge pixel light source of the pixel light source array transmits light. After passing through the microlens, the central axis of the light emission angle is inclined toward the direction close to the central pixel light source of the pixel light source array. When the size of the display panel is large, the light emitted from the edge pixel light source in the pixel light source array is used to make the light emitted from the edge pixel light source in the pixel light source array pass through the micro lens, and the central axis of the emission angle is inclined toward the center pixel light source of the pixel light source array. The length of the entire near-eye display optical system is shortened, the volume is reduced, and the technical effect of high light efficiency and uniform brightness is achieved.

In a possible implementation manner of the second aspect, the imaging lens group includes a free-form surface lens, a first reflector, and a second reflector, the free-form surface lens is close to the light exit side of the display panel, and the first reflector It is arranged on the light-emitting side of the free-form surface lens, the second mirror is arranged on the light-reflecting side of the first mirror, and the light emitted by the edge pixel light source of the pixel light source array passes through the micro lens. The central axis of is inclined toward the direction away from the central pixel light source of the pixel light source array. When the size of the display panel is small, the light emitted by the edge pixel light source of the pixel light source array is transmitted through the micro lens by using the micro lens, and the central axis of the light emission angle is inclined toward the direction away from the central pixel light source of the pixel light source array to ensure the appearance of the picture. Under the premise of the effect, the entire near-eye display optical system is small in size, compact in structure, high in light efficiency and good in brightness uniformity.

In a possible implementation of the second aspect, the imaging lens group includes an eccentric free-form surface lens and a mirror, the eccentric free-form surface lens is close to the light exit side of the display panel, and the mirror is disposed on the eccentric free-form surface On the light-emitting side of the lens, at least part of the light emitted from the pixel light source passes through the microlens and the central axis of the light-emitting angle is inclined toward the same direction of the eccentric free-form surface lens. If the near-eye display optical system is a non-axisymmetric optical system, the use of microlenses also achieves the technical effect of the entire near-eye display optical system with small size, compact structure, high light efficiency and good brightness uniformity.

In the third aspect, this application also provides an optical display module, including:

A near-eye display optical system, where the near-eye display optical system is the near-eye display optical system in the foregoing second aspect or any implementation manner of the second aspect;

Optical waveguide, the light emitted by the near-eye display optical system can enter the coupling-in area of the optical waveguide, and after propagating in the optical waveguide, can exit through the coupling-out area of the optical waveguide.

In a possible implementation manner of the third aspect, the optical waveguide is a diffractive optical waveguide and a reflective optical waveguide.

In a fourth aspect, this application also provides a head-mounted display device, including:

chassis;

An optical display module. The optical display module is the optical display module in the foregoing third aspect or any implementation of the third aspect, and the optical display module is disposed in the casing.

In the head-mounted display device provided by the embodiment of the present application, since the head-mounted display device adopts the optical display module described in the implementation manner of the third aspect, the head-mounted display device provided in the embodiment of the present application is similar to the foregoing technical solution. The optical display module can solve the same technical problem and achieve the same expected effect.

In a possible implementation manner of the fourth aspect, the head-mounted display device is augmented reality glasses or virtual reality glasses.

In a possible implementation manner of the fourth aspect, the optical display module has one set to form a monocular head-mounted display device, or the optical display module has two sets to form a binocular head-mounted display device.

Description of the drawings

FIG. 1 is a two-dimensional schematic diagram of the light-emitting solid angle of a conventional self-luminous display screen;

2 is a schematic diagram of the relationship between the luminous angle and luminous intensity of the existing self-luminous display screen;

Fig. 3 is a schematic diagram of the structure of a telecentric optical system in the prior art;

Fig. 4-A is a schematic diagram of the structure of a non-telecentric optical system in the prior art;

Figure 4-B is a schematic diagram of the luminous intensity of the display screen used in a non-telecentric optical system;

Fig. 5 is a picture brightness diagram when the non-telecentric optical system of Fig. 4-A is used with the self-luminous display of Fig. 1;

6 is a schematic structural diagram of a near-eye display optical system according to an embodiment of the application;

FIG. 7-A is a schematic diagram of the structure of the display panel of FIG. 6;

7-B is a schematic diagram of the luminous intensity distribution of five pixel light sources at different positions in FIG. 6;

FIG. 8 is a schematic structural diagram of a near-eye display optical system according to an embodiment of the application;

FIG. 9 is a schematic diagram of the structure of the display panel of FIG. 8;

10 is a schematic structural diagram of an optical system for near-eye display according to an embodiment of the application;

FIG. 11 is a schematic diagram of the structure of the display panel of FIG. 10;

FIG. 12 is a schematic diagram of the structure of a microlens on a display panel according to an embodiment of the application;

FIG. 13 is a schematic diagram of the structure of a microlens on a display panel according to an embodiment of the application;

FIG. 14 is a schematic structural diagram of a head-mounted display device according to an embodiment of the application;

15 is a schematic structural diagram of a near-eye display optical system applied to a monocular module according to an embodiment of the application;

16 is a schematic structural diagram of a near-eye display optical system applied to a binocular module according to an embodiment of the application;

FIG. 17 is a picture brightness diagram when the near-eye display optical system according to the embodiment of the present application is adopted.

Detailed ways

The embodiments of the present application relate to a display panel, a near-eye display optical system, and a head-mounted display device. The display panel, a near-eye display optical system, and a head-mounted display device will be described in detail below with reference to the accompanying drawings.

On the one hand, an embodiment of the present application provides a display panel, which is used to be arranged in a near-eye display optical system. Referring to FIGS. 7-A, 9 and 11, the display panel includes a substrate and self-emitting pixels. The light source array and the micro lens array. The micro lens array is arranged on the light emitting side of the pixel light source array. After the light emitted by the pixel light source 11 passes through the micro lens 2, the central axis of the light emission angle coincides with the chief ray of the near-eye display optical system at the pixel light source 11 Or the angle between the central axis and the chief ray is less than or equal to 5°, and the pixel light source array and the micro lens array are integrated on the substrate.

In the art, referring to FIG. 1, the central axis of the light emitted by the pixel light source and the normal line of the light-emitting surface of the display panel are parallel to each other. The microlens 2 is arranged on the light-emitting side of the pixel light source 11 to make any pixel light source 11 After the emitted light passes through the microlens 2, the central axis of the luminous angle coincides with the chief ray or the angle between the central axis and the chief ray is less than or equal to 5°, that is, the central axis of the luminous angle after passing through the microlens 2 and The angles of the normals of the light-emitting surface of the display panel are different. When the display panel is applied to the near-eye display optical system, the microlens 2 can ensure that the light emitted by each pixel light source 11 becomes the effective light of the near-eye display optical system. To achieve high luminous efficiency; in all pixel light sources 11, whether it is an edge pixel light source or a central pixel light source, the central axis of the emission angle after the microlens 2 coincides with the chief ray of the optical system or the angle between the two is less than or equal to 5 °, this can ensure that the brightness of the effective light is uniform from the center pixel light source to the edge pixel light source, thereby ensuring that the brightness of the picture is uniform. Compared with Figure 3 and Figure 6, the setting of the microlens array not only effectively shortens the near-eye display optical system The focal length can also reduce the volume of the entire near-eye display optical system, so that the entire near-eye display optical system can achieve miniaturization design requirements.

It should be noted that the edge pixel light source in the pixel light source refers to the pixel light source close to the edge of the active area (AA) of the display panel, and the central pixel light source in the pixel light source refers to the pixel light source close to the center of the AA area of the display panel.

In order to further reduce the volume of the near-eye display optical system, further improve the light efficiency, and further improve the uniformity of the picture, after the light emitted by the pixel light source 11 passes through the microlens 2, the central axis of the light-emitting angle and the near-eye display optical system are in the pixel light source 11 The chief rays coincide or the angle between the central axis and the chief rays is less than or equal to 3°.

For example, the microlens in the microlens array can be a free-form surface lens, a spherical lens, aspherical lens, a cylindrical lens or a Fresnel lens can be selected, according to the distance between the central axis of the light-emitting angle of the microlens and the light-emitting surface of the display screen. The specific included angles of the normals design the specific structure of the microlens, and the specific structure of the microlens is not limited here.

The pixel light source array is a liquid crystal display array (Liquid Crystal Display, LCD), an organic light-emitting diode array (Organic Light-emitting Diode, OLED) or a micro LED array (micro LED) array. Of course, other self-luminous pixel light source arrays can also be selected for the pixel light source array.

In the display panel, as shown in Figure 12, the optical parameters of all the microlenses in the microlens array can be all the same, or it can be that some of the microlenses in the microlens array have the same optical parameters, and some of the microlenses have different optical parameters. Alternatively, as shown in FIG. 13, the optical parameters of every two microlenses in the microlens array are different. The optical parameters of the microlens refer to: radius of curvature, center/edge thickness, effective focal length, front and rear focal length, center deviation, refractive index, etc.

On the other hand, an embodiment of the present application also provides a near-eye display optical system. Referring to FIGS. 6, 8 and 10, the near-eye display optical system includes a display panel and an imaging lens group 3. The display panel is the display provided by the above-mentioned embodiment. For the panel, the imaging lens group 3 is arranged on the light emitting side of the display panel, that is, the micro lens array is arranged between the pixel light source array and the imaging lens group 3. The specific light path is: after the light emitted by the pixel light source 11 passes through the microlens 2, the central axis of the emission angle coincides with the chief ray or the angle between the two is less than or equal to 5°, and the light on the light exit side of the microlens 2 is transmitted again To the imaging lens group 3, the display of the image is finally realized.

Since the near-eye display optical system adopts the display panel provided by the above-mentioned embodiment, referring to FIGS. 6, 8 and 10, the light emitted by the pixel light source 11 can be effectively transmitted to the imaging lens group 3, thereby improving the entire near-eye display optical system. The edge pixel light source of the pixel light source 11 is the same as the central pixel light source, and the light is effectively transmitted to the imaging lens group 3. As shown in Figure 7-A and Figure 7-B, the first pixel light source 11 located at the edge -1 and the second pixel light source 11-2, as well as the fourth pixel light source 11-4 and the fifth pixel light source 11-5, respectively, and the third pixel light source 11-3 located in the center have different emission angle directions but the same luminous intensity. 17 Compared with the prior art shown in FIG. 5, it avoids the phenomenon of high brightness at the center of the picture and low brightness at the edges of the picture. Compared with the prior art shown in FIG. 3, the size of the entire imaging lens group 3 can also be reduced. Furthermore, the volume of the entire near-eye display optical system is reduced, and the focal length is shortened, which also reduces the volume of the entire near-eye display optical system. Finally, under the premise of ensuring that the near-eye display optical system has high luminous efficiency and uniform picture brightness, it is realized The miniaturization of the near-eye display optical system is consistent with the current miniaturization design requirements for electronic equipment.

In some embodiments, referring to FIG. 6, the imaging lens group 3 includes a plurality of lenses 31, which are arranged in sequence along the light path on the light emitting side of the display panel. Referring to FIG. 7-A, the edge pixel light source in the pixel light source 11 After the emitted light passes through the microlens 2, the central axis of the emission angle is inclined toward the direction of the central pixel light source in the pixel light source. That is, when the size of the display panel is large, the light emitted from the edge pixel light source in the pixel light source 11 is transmitted through the micro lens 2 by using a micro lens array, and the central axis of the emission angle is inclined toward the direction close to the central pixel light source in the pixel light source. , The length and size of the entire near-eye display optical system are shortened, the volume is reduced, and the technical effects of high light efficiency and uniform brightness are realized.

The embodiment will be described below with reference to FIG. 7-A. The five pixel light sources located along different positions from right to left are the first pixel light source 11-1, the second pixel light source 11-2, and the third pixel light source 11, respectively. -3. The fourth pixel light source 11-4 and the fifth pixel light source 11-5, the angle α1 between the chief ray of the first pixel light source 11-1 and the normal of the display screen surface is 20°, and the second pixel light source 11- The angle α2 between the chief ray of 2 and the normal of the display surface is 10°, and the angle α3 between the chief ray of the third pixel light source 11-3 and the normal of the display surface is 0° (when the chief ray and the display surface When the normals of the pixels overlap, there is no need to provide a microlens on the pixel unit), the angle α4 between the chief ray of the fourth pixel light source 11-4 and the normal of the display screen surface is 10°, and the fifth pixel light source 11- The angle α5 between the chief ray of 5 and the normal of the display surface is 20°, which defines the angle between the normal of the display surface and the chief ray of the pixel light source when rotating counterclockwise as a positive value, and rotating clockwise as a negative value, then From right to left, the angles between the chief rays of the five pixel light sources and the normal of the display surface are 20°, 10°, 0°, -10°, and -20°, respectively. Therefore, the angle between the central axis of the luminous angle emitted by the corresponding five microlenses and the normal line of the display surface is 20°±5°, 10°±5°, 0°±5°, -10°±5 ° and -20°±5°. It should be noted that the near-eye display optical system is explained here only through five pixel light sources, and the layout principle of the angle between the central axis of the other pixel light sources and the normal line of the display screen surface is the same as the above five pixel units, which will not be repeated here. Exhaustive.

In some embodiments, referring to FIGS. 8 and 9, the imaging lens group 3 in the near-eye display optical system includes a free-form surface lens 32, a first mirror 33, and a second mirror 34, and the free-form surface lens 32 is close to the display panel. The first reflecting mirror 33 is arranged on the light-exiting side of the free-form surface lens 32, and the second reflecting mirror 34 is arranged on the reflecting side of the first reflecting mirror 33. The light emitted by the edge pixel light source in the pixel light source passes through the microlens 2. The central axis of the back light emission angle is inclined toward the direction away from the central pixel light source in the pixel light source. When the size of the display panel is small, the light emitted by the edge pixel light source in the pixel light source passes through the microlens 2 and the central axis of the emission angle is inclined toward the direction away from the central pixel light source in the pixel light source, which ensures that the near-eye display optical system has high light. Under the premise of high efficiency and uniform picture brightness, the entire near-eye display optical system has a compact structure and a small volume.

The embodiment is described below with reference to FIG. 9. The three pixel light sources located at different positions from right to left are the first pixel light source, the second pixel light source, and the third pixel light source. The chief ray of the first pixel light source is the same as that of the third pixel light source. The included angle β1 of the normal line of the display screen surface is 15°, and the included angle β2 between the chief ray of the second pixel light source and the normal line of the display screen surface is 0° (when the chief ray coincides with the normal line of the display screen surface, it is not necessary It is necessary to set a microlens on the pixel light source), the angle β3 between the chief ray of the third pixel light source and the normal of the display surface is 15°, which defines the inverse of the angle between the normal of the display surface and the principal ray of the pixel light source The clockwise rotation is a positive value, and the clockwise rotation is a negative value. From right to left, the angles between the chief rays of the three pixel light sources and the normal of the display surface are -15°, 0°, and 15°, respectively. Therefore, the included angles between the central axis of the light-emitting angles emitted by the corresponding three microlenses and the normal line of the display screen surface are -15°±5°, 0°±5°, and 15°±5°. It should be noted that the near-eye display optical system is explained here only through three pixel light sources, and the layout principle of the angle between the central axis of the other pixel light sources and the normal line of the display screen surface is the same as the above three pixel light sources, which will not be repeated here. Enumerate.

In some embodiments, referring to FIGS. 10 and 11, the imaging lens group 3 includes an eccentric free-form surface lens 35 and a mirror 36. The eccentric free-form surface lens 35 is close to the light exit side of the display screen assembly, and the mirror 36 is disposed on the eccentric free-form surface lens. On the light emitting side of 35, at least part of the light emitted from the pixel light source 11 passes through the microlens 2 and the central axis of the light emission angle is inclined toward the same direction of the eccentric freeform lens 35. In this embodiment, the display panel is applied to a non-axisymmetric optical system. By providing a microlens array, the entire near-eye display optical system has high luminous efficiency and uniform picture brightness, as well as the advantages of small size.

The embodiment is described below with reference to FIG. 11. The five pixel light sources located along different positions from right to left are the first pixel light source, the second pixel light source, the third pixel light source, the fourth pixel light source, and the fifth pixel light source. Light source, the angle γ1 between the chief ray of the first pixel light source and the normal line of the display screen surface is 3°, the angle γ2 between the chief ray of the second pixel light source and the normal line of the display screen surface is 4°, the third pixel light source The angle γ3 between the chief ray and the normal of the display surface is 5°, the angle γ4 between the chief ray of the fourth pixel light source and the normal of the display surface is 20°, the chief ray of the fifth pixel light source and the display screen The angle γ5 of the normal of the surface is 40°, which defines the angle between the normal of the display screen surface and the chief ray of the pixel light source when rotated counterclockwise as a positive value, and rotated clockwise as a negative value, and from right to left, there are five The angles between the chief ray of the pixel light source and the normal of the display screen surface are -3°, 4°, 5°, 20°, and 40°, respectively. Therefore, the angle between the central axis of the luminous angle emitted by the corresponding five microlenses and the normal of the display surface is -3°±5°, 4°±5°, 5°±5°, 20°±5 ° and 40°±5°. It should be noted that the near-eye display optical system is explained here only through five pixel units, and the layout principle of the angle between the central axis of the other pixel light sources and the normal line of the display screen surface is the same as the above five pixel units, and will not be repeated here. Enumerate.

Of course, the imaging lens group 3 may also have other structures, and any structure falls within the protection scope of the present application.

On the other hand, an embodiment of the present application also provides an optical display module. As shown in FIG. 14, the optical display module includes a near-eye display optical system 1 and an optical waveguide 4, and the near-eye display optical system is provided by the above-mentioned embodiment. The near-eye display optical system, the light emitted by the near-eye display optical system 1 enters the coupling-in area 41 of the optical waveguide 4 through the exit pupil, and exits through the coupling-out area 42 of the optical waveguide 4 after the optical waveguide propagates.

In some embodiments, the optical waveguide 4 includes, but is not limited to, a diffractive optical waveguide and a reflective optical waveguide. The optical waveguide is not limited here.

On the other hand, an embodiment of the present application also provides a head-mounted display device, which includes a casing, a near-eye display optical system 1 and an optical waveguide 4 (refer to FIG. 14) arranged in the casing.

A near-eye optical display system 1 and an optical waveguide 4 are an optical display module. When the head-mounted display device is single-purpose, the casing is an optical display module. When the head-mounted display device is dual-purpose, it is inside the casing Two optical display modules. FIG. 15 shows a monocular head-mounted display device, that is, it has a set of optical display modules, and FIG. 16 shows a binocular head-mounted display device that has two sets of optical display modules.

Since the head-mounted display device includes the optical display module provided in the foregoing embodiment, the head-mounted display device and the optical display module described in the foregoing technical solution can solve the same technical problems and achieve the same expected effects.

In some embodiments, the head-mounted display device is augmented reality glasses or virtual reality glasses. Of course, the head-mounted display device may also be other devices.

In some embodiments, when the monocular module is formed, referring to FIG. 15, the left or right eye adopts the optical display module (including the near-eye display optical system 1 and the optical waveguide 4) provided in the embodiments of the application, and when the binocular mode is formed In the grouping, the left eye and the right eye adopt the optical display module (including the near-eye display optical system 1 and the optical waveguide 4) provided by the embodiments of the present application.

Of course, in the structure shown in FIG. 15 and FIG. 16, the optical display module may only include the near-eye optical display system instead of the optical waveguide. Such an optical display module can be used as an AR optical display module or a VR optical display module. In the description of this specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. It should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

A display panel, wherein the display panel is used to be installed in a near-eye display optical system, wherein the display panel includes:

Substrate

Pixel light source array that emits light spontaneously;

The microlens array is arranged on the light-emitting side of the pixel light source array. After the light emitted by the pixel light source passes through the microlens, the central axis of the light-emitting angle and the near-eye display optical system are on the main side of the pixel light source. The light rays coincide or the angle between the central axis and the chief ray is less than or equal to 5°;

Both the pixel light source array and the micro lens array are integrated on the substrate.
The display panel of claim 1, wherein the pixel light source array is a liquid crystal display array, an organic light emitting diode array, or a micro light emitting diode array.
The display panel of claim 1 or 2, wherein the microlens in the microlens array is a free-form surface lens, a spherical lens, an aspherical lens, or a cylindrical lens.
The display panel according to any one of claims 1 to 3, wherein the optical parameters of at least part of the microlenses of the microlens array are the same, or the optical parameters of every two microlenses in the microlens array The optical parameters are all different.
A near-eye display optical system, which is characterized in that it comprises:

A display panel, the display panel being the display panel according to any one of claims 1 to 4;

An imaging lens group, the imaging lens group is arranged on the light exit side of the display panel.
The near-eye display optical system according to claim 5, wherein the imaging lens group comprises a plurality of lenses, and the plurality of lenses are arranged in sequence along the light path on the light exit side of the display panel, and the pixel light source array After the light emitted by the edge pixel light source passes through the microlens, the central axis of the emission angle is inclined toward the direction of the central pixel light source of the pixel light source array.
The near-eye display optical system according to claim 5, wherein the imaging lens group includes a free-form surface lens, a first reflector and a second reflector, and the free-form surface lens is close to the light exit side of the display panel, The first reflecting mirror is arranged on the light emitting side of the free-form surface lens, the second reflecting mirror is arranged on the reflecting side of the first reflecting mirror, and the light emitted by the edge pixel light source in the pixel light source array is transmitted through The central axis of the light-emitting angle behind the microlens is inclined toward a direction away from the central pixel light source of the pixel light source array.
The near-eye display optical system according to claim 5, wherein the imaging lens group comprises an off-center free-form surface lens and a mirror, the off-center free-form surface lens is close to the light exit side of the display panel, and the mirror is disposed On the light exit side of the eccentric free-form surface lens, at least part of the light emitted from the pixel light source passes through the microlens and the central axis of the light-emitting angle is inclined toward the same direction of the eccentric free-form surface lens.
An optical display module, characterized in that it comprises:

A near-eye display optical system, wherein the near-eye display optical system is the near-eye display optical system according to any one of claims 5 to 8;

Optical waveguide, the light emitted by the near-eye display optical system can enter the coupling-in area of the optical waveguide, and after propagating in the optical waveguide, can exit through the coupling-out area of the optical waveguide.
A head-mounted display device is characterized in that it comprises:

chassis;

An optical display module, the optical display module being the optical display module of claim 9;

The optical display module is arranged in the casing.
The head-mounted display device according to claim 10, wherein the optical display module has one set to form a monocular head-mounted display device, or the optical display module has two sets to form a dual Head-mounted display device.
The head-mounted display device according to claim 10 or 11, wherein the head-mounted display device is augmented reality glasses or virtual reality glasses.