Display device

Abstract

The utility model discloses a display device which comprises a light source module used for emitting image light; the waveguide is used for coupling out the image light at a target emergent angle, and the target emergent angle is within a set angle range; the angle filter is arranged at the light emitting position of the waveguide and comprises a light passing area used for selectively transmitting image light with the incident angle within a set angle range; and the displacement table is mechanically connected with the angle filter and is used for driving the angle filter to move, so that the image light transmitted by the moved angle filter enters human eyes. The angle filter is arranged at the light emitting position of the waveguide to selectively transmit the image light with the incident angle within the set angle range, ambient light can be restrained, the display effect of the display device is improved, the angle filter is moved through the displacement table, and it can be guaranteed that when the angle screening range of the angle filter is small, the display effect is improved. The image light incident to the human eyes can form a complete display image, so that the suppression effect of the display device on the ambient light is improved.

Description

Technical Field

[0001] The present application relates to the field of optical technology, and in particular to a display device. Background Art

[0002] With the rapid development of display technology, when waveguides are used in display devices, the image light emitted by the waveguide can be projected to the human eye, generating a complete display image on the retina of the human eye. However, due to the presence of some reflective elements in the display device, when the ambient light is reflected and enters the human eye along with the image light emitted by the waveguide, the image formed by the ambient light will be superimposed on the display image formed by the display device, resulting in poor display effect of the image at the human eye. Utility Model Content

[0003] The present application proposes a display device, comprising: a light source module, for emitting image light; a waveguide, arranged in the light emitting direction of the light source module, for coupling out the image light at a target emission angle, wherein the target emission angle is within a set angle range; an angle filter, arranged at the light emitting part of the waveguide, wherein the angle filter comprises a light-transmitting area, wherein the light-transmitting area is used to selectively transmit the image light whose incident angle is within the set angle range; a displacement stage, mechanically connected to the angle filter, wherein the displacement stage is used to drive the angle filter to move, so that the image light transmitted by the angle filter after movement is incident to the human eye.

[0004] Optionally, the light-transmitting area includes a plurality of through holes distributed in an array, the inclination angles of the plurality of through holes are within the set angle range, and the inclination angles of the plurality of through holes gradually increase from the middle to the edge of the angle filter.

[0005] Optionally, the angle screening range of each through hole is greater than or equal to for:

[0006]

[0007] Wherein, D is the relative distance between the centers of two adjacent through holes, D is less than or equal to the pupil radius of the human eye, and L is the relative distance between the human eye and the waveguide.

[0008] Optionally, each of the through holes is used to transmit The image light inside, N is the tilt angle of the through hole.

[0009] Optionally, the waveguide includes a coupling-in region and a coupling-out region; the coupling-in region is arranged in the light emitting direction of the light source module, and the coupling-in region is used to couple the image light projected onto the coupling-in region into the waveguide; the coupling-out region is used to couple out the image light transmitted by the waveguide at the target emission angle.

[0010] Optionally, the light-transmitting area is used to receive the first image light coupled out by a target area in the outcoupling area, the target area is located at a position aligned with the light-transmitting area, and a size of the light-transmitting area is smaller than a size of the outcoupling area.

[0011] Optionally, the angle filter further includes a light absorption region, which is surrounded by the light-transmitting region; the light absorption region is used to absorb second image light and ambient light, and the second image light is image light emitted from an area in the outcoupling region other than the target area.

[0012] Optionally, the waveguide is a two-dimensional pupil expansion waveguide, and any position of the outcoupling region of the two-dimensional pupil expansion waveguide is used to couple out the image light at the target exit angle.

[0013] Optionally, the display device also includes a human eye tracking module, which is electrically connected to the displacement stage; the human eye tracking module is used to track the position of the human eye; the displacement stage is used to drive the angle filter to move in the first plane to a target position corresponding to the position of the human eye, so that the image light passed by the angle filter moved to the target position is incident on the human eye, and the first plane is parallel to the plane where the waveguide is located.

[0014] Optionally, the display device further comprises a reflector, wherein the reflector is arranged in the light beam output direction of the angle filter, and the reflector is used to reflect the image light and output it to human eyes.

[0015] The display device provided by the present application includes: a light source module for emitting image light; a waveguide, arranged in the light emitting direction of the light source module, for coupling out the image light at a target emitting angle, the target emitting angle being within a set angle range; an angle filter, arranged at the light emitting part of the waveguide, the angle filter including a light-transmitting area, the light-transmitting area being used for selectively transmitting the image light whose incident angle is within a set angle range; a displacement stage, mechanically connected to the angle filter, the displacement stage being used for driving the angle filter to move, so that the image light transmitted by the angle filter after the movement is incident to the human eye. Based on this, by arranging the angle filter at the light emitting part of the waveguide to selectively transmit the image light whose incident angle is within a set angle range, the ambient light existing in the display device can be suppressed, and the display effect of the display device can be improved; at the same time, when the position of the human eye moves, the angle filter can be moved correspondingly by the displacement stage, so that when the angle screening range of the angle filter is small, the image light selectively transmitted by the angle filter can form a complete display image at the human eye, thereby improving the suppression effect of the display device on ambient light.

[0016] These and other aspects of the present application will become more clearly understood in the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic structural diagram of a display device provided in one embodiment of the present application is shown.

[0019] Figure 2 A top view of a light-transmitting area provided in an embodiment of the present application is shown.

[0020] Figure 3 A cross-sectional view of a light-transmitting area provided in an embodiment of the present application is shown.

[0021] Figure 4 Shows this application Figure 3 Schematic diagram of the structure of the provided through hole.

[0022] Figure 5 A schematic structural diagram of a display device provided in another embodiment of the present application is shown.

[0023] Figure 6 Shows this application Figure 5 A top view of a display device is provided.

[0024] Figure 7A schematic diagram of image light emitted from an outcoupling region of a waveguide provided in an embodiment of the present application is shown.

[0025] Figure 8 A schematic diagram showing image light passing through a light-transmitting area provided by an embodiment of the present application is shown.

[0026] Fig. 9 A schematic structural diagram of a display device provided in yet another embodiment of the present application is shown. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0028] The terms "first", "second", etc. in this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] Please refer to Figure 1 , Figure 1 The structure diagram of the display device 1 provided by an embodiment of the present application is shown below. Figure 1 The display device 1 provided in the embodiment of the present application is described in detail. Figure 1 As shown, the display device 1 of the present application includes a light source module 10 , a waveguide 20 , an angle filter 30 and a translation stage 40 .

[0031] In this embodiment, the light source module 10 is used to emit image light for forming a display image, and a waveguide 20 is provided in the light emitting direction of the light source module 10. The waveguide 20 is used to receive the image light projected to the waveguide 20 by the light source module 10, and after totally reflecting the coupled-in image light, couple out the totally reflected-transmitted image light at a target emission angle, and the target emission angle is within a set angle range.

[0032] Optionally, the image light emitted by the waveguide 20 in the display device 1 is used to project to the human eye to form a complete display image on the retina of the human eye. In addition, since there are some reflective elements in the display device 1, for example, the surface of the waveguide 20 can reflect ambient light, when the image light coupled out of the waveguide 20 enters the human eye, the ambient light reflected by the surface of the waveguide 20 will enter the human eye along with the image light coupled out of the waveguide 20, resulting in poor display effect of the image displayed at the human eye.

[0033] In this embodiment, an angle filter 30 is provided at the light outlet of the waveguide 20. When the image light coupled out of the waveguide 20 is projected onto the angle filter 30, the angle filter 30 is used to selectively transmit the light beam projected onto the angle filter 30. The angle filter 30 includes a light-transmitting area 31. The light-transmitting area 31 of the angle filter 30 is used to selectively transmit the image light whose incident angle is within a set angle range, and project the selectively transmitted image light to the human eye. Since the ambient light projected onto the angle filter 30 along with the image light is scattered light, the image light is filtered by the angle filter 30 when it is projected onto the angle filter 30 and cannot enter the human eye, thereby avoiding the interference of ambient light during the image display process.

[0034] Optionally, the waveguide 20 is a two-dimensional pupil expansion waveguide, and when the two-dimensional pupil expansion waveguide couples out the image light, any position of the two-dimensional pupil expansion waveguide couples out the image light at a target exit angle. The image light that can be transmitted at each position in the light-transmitting area 31 of the angle filter 30 has different incident angles. For example, the middle area of ​​the light-transmitting area 31 can at least transmit the image light vertically emitted from the area on the waveguide 20 where the middle area of ​​the light-transmitting area 31 is located, and the edge area of ​​the light-transmitting area 31 can at least transmit the image light emitted at the maximum angle within a set angle range from the area on the waveguide 20 where the edge area of ​​the light-transmitting area 31 is located, so that after the light-transmitting area 31 selectively transmits the image light whose incident angle is within the set angle range, the image light projected to the human eye can form a complete display image.

[0035] When the image light coupled out of the waveguide 20 in the display device 1 enters the human eye, the position of the human eye changes. The image light emitted from the target out-coupling position on the waveguide 20 has different transmission angles required to enter the human eye at different positions of the human eye. At this time, the incident angles of the image light received at the positions corresponding to the target out-coupling position in the light-transmitting area 31 are different.

[0036] In this embodiment, if the angle screening range of each position in the light-transmitting area 31 of the angle filter 30 is set to be large, so that when the position of the human eye moves, each position of the light-transmitting area 31 can form a complete display image at the human eye after selectively transmitting the image light, which will lead to poor suppression effect of the angle filter 30 on ambient light. Therefore, in order to ensure that the image light selectively transmitted by the angle filter 30 can form a complete display image on the retina of the human eye when projected to the human eye, and to ensure the suppression effect of the angle filter 30 on ambient light, a displacement stage 40 is further provided in this embodiment.

[0037] Optionally, the translation stage 40 is mechanically connected to the angle filter 30, and the translation stage 40 is used to drive the angle filter 30 to move, so that the image light transmitted by the moved angle filter 30 is incident on the human eye.

[0038] Specifically, after the translation stage 40 drives the angle filter 30 to move, the position of the light-transmitting area 31 of the angle filter 30 corresponds to the position of the human eye. At this time, the middle area of ​​the light-transmitting area 31 only needs to transmit the image light vertically emitted from the area on the waveguide 20 aligned with the middle area of ​​the light-transmitting area 31, and the edge area of ​​the light-transmitting area 31 only needs to transmit the image light emitted at the maximum angle within the set angle range from the area on the waveguide 20 aligned with the edge area of ​​the light-transmitting area 31. Based on this, when the angle screening range of each position of the light-transmitting area 31 is set to be small, while ensuring the suppression effect of the angle filter 30 on the ambient light, by correspondingly moving the angle filter 30 through the translation stage 40 when the position of the human eye moves, it can also be ensured that the image light selectively transmitted by the angle filter 30 can form a complete display image at the human eye.

[0039] In this embodiment, the display device 1 includes: a light source module 10, which is used to emit image light; a waveguide 20, which is arranged in the light emitting direction of the light source module 10, and is used to couple out the image light at a target emission angle, and the target emission angle is within a set angle range; an angle filter 30, which is arranged at the light outlet of the waveguide 20, and the angle filter 30 includes a light-transmitting area 31, and the light-transmitting area 31 is used to selectively transmit image light whose incident angle is within the set angle range; a displacement stage 40, which is mechanically connected to the angle filter 30, and the displacement stage 40 is used to drive the angle filter 30 to move, so that the image light transmitted by the angle filter 30 after movement is incident to the human eye. Based on this, by setting an angle filter 30 at the light outlet of the waveguide 20 to selectively transmit image light with an incident angle within a set angle range, the ambient light existing in the display device 1 can be suppressed, thereby improving the display effect of the display device 1; at the same time, when the position of the human eye moves, the angle filter 30 is moved accordingly by the displacement stage 40, so that when the angle screening range of the angle filter 30 is small, the image light selectively transmitted by the angle filter 30 can form a complete display image at the human eye, thereby improving the display device 1 The suppression effect of ambient light.

[0040] See also Figure 2 , Figure 2 FIG. 2 shows a top view of the light-transmitting area 31 provided in an embodiment of the present application. Figure 2 As shown, the light passing area 31 includes a plurality of through holes 311 distributed in an array, and the inclination angles of the plurality of through holes 311 relative to the normal direction of the waveguide surface are within a set angle range.

[0041] Specifically, Figure 3 As shown, Figure 3 A cross-sectional view of a light-transmitting area 31 provided in an embodiment of the present application is shown. The inclination angle N of the plurality of through holes 311 relative to the normal direction of the waveguide surface gradually increases from the middle to the edge of the angle filter 30, and each through hole 311 can at least transmit image light whose incident angle matches the inclination angle N of each through hole 311. Based on this, the middle area of ​​the light-transmitting area 31, which is provided with through holes 311 with a smaller inclination angle N, can at least transmit image light incident at a smaller incident angle, and the edge area of ​​the light-transmitting area 31, which is provided with through holes 311 with a larger inclination angle N, can at least transmit image light incident at the maximum angle within a set angle range. Among them, the through hole shapes of the plurality of through holes 311 are the same, and the through hole shape of each through hole 311 can be at least one of circular, square and rectangular, without limitation herein.

[0042] Alternatively, if Figure 4 As shown, Figure 4 Shows this application Figure 3 The schematic diagram of the structure of the through hole provided. For example, the pupil center of the human eye is located at O0, and the inclination angle of the through hole A is The inclination angle of through hole B is At this time, the emission angles of the waveguide at points A and B are The light 1 and The light 2 can reach the pupil center O0 of the human eye through the corresponding through hole, and the angle range is and The light between points A and B needs to be emitted from the area between the waveguide to reach the pupil center O0 of the human eye. The light within the remaining angle range will be blocked by the side wall of the through hole and then absorbed.

[0043] Optionally, in order to ensure that the image light selectively transmitted by the angle filter can form a complete display image at the human eye and avoid the loss of the display image, it is necessary to ensure that the angle range is within and The light between can at least reach the human eye through through hole A or through hole B, and the incident position at the human eye is less than or equal to the pupil radius of the human eye from the pupil center O0. For example, at the entrance of through hole B, if the exit angle of the waveguide at point C is When the light 3 can pass through the through hole B and project to the plane where the human eye is located at the position of O1, the distance between O0 and O1 is less than or equal to the pupil radius of the human eye, so that the light 3 can be incident on the human eye. Therefore, it is necessary to ensure that through hole A or through hole B can accommodate an angle range of and All light between them passes through, and through hole A and through hole B are less than or equal to the pupil radius of the human eye.

[0044] Based on this, in this embodiment, the angle screening range of each through hole is greater than or equal to for:

[0045]

[0046] Wherein, D is the relative distance between the centers of two adjacent through holes, D is less than or equal to the pupil radius of the human eye, and L is the relative distance between the human eye and the waveguide 20 .

[0047] Furthermore, each through hole has an inclination angle of N, and each through hole is used to transmit light having an incident angle of Image light within.

[0048] In the embodiment of the present application, the middle area of ​​the light-transmitting area 31 in the angle filter is provided with a through hole 311 with a smaller tilt angle for transmitting image light incident at a smaller incident angle, and the edge area of ​​the light-transmitting area 31 is provided with a through hole 311 with a larger tilt angle for transmitting image light incident at a larger angle within a set angle range, and the angle screening range of the multiple through holes 311 in the light-transmitting area 31 is set to be smaller, thereby improving the angle filter's suppression effect on ambient light. In addition, when the position of the human eye moves, the angle filter is correspondingly moved by the displacement stage, so that when the angle screening range of the angle filter is smaller, the image light selectively transmitted by the angle filter can also form a complete display image at the human eye, thereby ensuring the display effect of the display device at the human eye.

[0049] See also Figure 5 , Figure 5 A schematic diagram of the structure of a display device provided by another embodiment of the present application is shown. Figure 5 The display device provided in the embodiment of the present application is described in detail. Figure 5 As shown, the display device of the present application includes a light source module 10 , a waveguide 20 , an angle filter 30 and a translation stage 40 .

[0050] In this embodiment, the waveguide 20 includes a coupling-in region 21 and a coupling-out region 22. The coupling-in region 21 is arranged in the light emitting direction of the light source module 10, and the coupling-in region 21 is used to couple the image light projected onto the coupling-in region 21 into the waveguide 20; the coupling-out region 22 is used to couple out the image light transmitted by the waveguide 20 at a target emission angle. The waveguide 20 is a two-dimensional pupil expansion waveguide, and any position of the coupling-out region 22 of the two-dimensional pupil expansion waveguide is used to couple out the image light at a target emission angle.

[0051] Optionally, the angle filter 30 is arranged at the light output of the outcoupling area 22 of the waveguide 20, and the light-transmitting area 31 of the angle filter 30 is used to receive the first image light coupled out by the target area in the outcoupling area 22, the position of the target area is aligned with the position of the light-transmitting area 31, and the size of the light-transmitting area 31 is smaller than the size of the outcoupling area 22.

[0052] Furthermore, the angle filter 30 further includes a light absorption region 32, which is disposed around the light transmission region 31. The light absorption region 32 is used to absorb the second image light and the ambient light, wherein the second image light is the image light emitted from the region other than the target region in the outcoupling region 22.

[0053] Optionally, the light absorbing region 32 is made of a light absorbing material, and in the light-transmitting region 31 of the angle filter 30, a plurality of array-distributed through holes in the light-transmitting region 31 are used to selectively transmit image light whose incident angle is within a set angle range, and the region between two adjacent through holes in the light-transmitting region 31 is also made of a light absorbing material to absorb ambient light. When a partially reflective element exists in the display device, sunlight is projected to the coupling region 21 of the waveguide 20 in the opposite direction of the emission direction of the image light, causing the waveguide 20 to overheat and affecting the performance of the waveguide 20. By using light absorbing materials in the light-transmitting region 31 and the light absorbing region 32 on the angle filter 30, the incident sunlight can be absorbed, thereby ensuring the performance of the waveguide 20.

[0054] In this embodiment, if Figure 6 As shown, Figure 6 Shows this application Figure 5 A top view of a display device is provided. In the display device, the size of the angle filter 30 including the light-transmitting area 31 and the light-absorbing area 32 is greater than or equal to the size of the outcoupling area 22 of the waveguide 20, while the size of the light-transmitting area 31 in the angle filter 30 is smaller than the size of the outcoupling area 22 of the waveguide 20, and the light-transmitting area 31 only receives the first image light coupled out by the target area in the outcoupling area 22 of the waveguide 20. After the angle filter 30 is moved by the translation stage 40, since any position of the outcoupling area 22 of the waveguide 20 couples out the image light at the target emission angle, the light-transmitting area 31 only selectively transmits the first image light coupled out by the target area in the outcoupling area 22.

[0055] For example, Figure 7 As shown, Figure 7 A schematic diagram of image light emitted from the outcoupling region 22 of a waveguide provided in an embodiment of the present application is shown. In the outcoupling region 22 of the waveguide, the image light coupled out of region E, the image light coupled out of region F, and the image light coupled out of region G are all coupled out at a target emission angle, and the target emission angle is within a set angle range.

[0056] In this embodiment, after the angle filter is moved by the translation stage, the light-transmitting area of ​​the angle filter only receives the first image light coupled out of the target area in the outcoupling area, and the position of the target area is aligned with the position of the light-transmitting area. Figure 8 As shown, Figure 8 A schematic diagram showing image light passing through a light-transmitting area provided by an embodiment of the present application is shown.

[0057] Exemplarily, after the angle filter is moved by the translation stage, if the light-transmitting area 31 of the angle filter is located at an area E of the out-coupling area 22, the light-transmitting area 31 of the angle filter only receives the image light coupled out of area E; if the light-transmitting area 31 of the angle filter is located at an area F of the out-coupling area 22, the light-transmitting area 31 of the angle filter only receives the image light coupled out of area F; if the light-transmitting area 31 of the angle filter is located at an area G of the out-coupling area 22, the light-transmitting area 31 of the angle filter only receives the image light coupled out of area G.

[0058] Based on this, when the position of the human eye moves, after the angle filter is driven to move by the translation stage, the position of the light-transmitting area 31 in the angle filter corresponds to the position of the human eye, and the light-transmitting area 31 selectively transmits only the first image light coupled out of the target area in the coupling-out area 22. At this time, the actual eye box area of ​​the display device is equivalent to the eye box area corresponding to the target area in the eye box area of ​​the waveguide, that is, the setting of the angle filter can selectively enable a small area in the eye box area of ​​the waveguide. Among them, the eye box area refers to a conical area between the near-eye display optical module and the eyeball, and is also the area where the display content is clearest.

[0059] In this embodiment, the light-transmitting area 31 is provided with a middle area of ​​through holes with a smaller inclination angle for transmitting the first image light incident at a smaller incident angle, and the light-transmitting area 31 is provided with an edge area of ​​through holes with a larger inclination angle for transmitting the first image light incident at the maximum angle within a set angle range, so that when the angle screening range of the multiple through holes in the light-transmitting area 31 is small, it can also be ensured that the image light selectively transmitted by the angle filter 30 can form a complete display image at the human eye. In addition, when the position of the human eye moves, the angle filter 30 is driven to move by the displacement stage 40, so that the actual eye box area of ​​the display device is equivalent to the eye box area corresponding to the target area in the eye box area of ​​the waveguide 20, so that the angle screening range of the angle filter 30 is no longer restricted by the actual larger eye box area of ​​the waveguide 20, and the angle filter 30 with a smaller angle screening range can be set, thereby ensuring the suppression effect of the angle filter 30 on ambient light.

[0060] See also Fig. 9 , Fig. 9 A schematic diagram of the structure of a display device provided by another embodiment of the present application is shown. Fig. 9 The display device provided in the embodiment of the present application is described in detail. Fig. 9 As shown, the display device of the present application includes a light source module 10 , a waveguide 20 , an angle filter 30 and a translation stage 40 .

[0061] In this embodiment, the display device further includes an eye tracking module 50, which is electrically connected to the translation stage 40. The eye tracking module 50 is used to track the position of the human eye; the translation stage 40 is used to drive the angle filter 30 to move to a target position corresponding to the position of the human eye on the first plane, so that the image light transmitted by the angle filter 30 moved to the target position is incident on the human eye, and the first plane is parallel to the plane where the waveguide 20 is located.

[0062] Optionally, the display device further includes a reflector 60 , which is disposed in the light beam output direction of the angle filter 30 , and is used to reflect the image light and output it to human eyes.

[0063] In some embodiments, the display device is applied to a head-up display (HUD) system of a car. The head-up display system can project important information such as vehicle speed and navigation onto the front windshield in front of the driver, allowing the driver to see important driving information such as vehicle speed and navigation without lowering or turning his head, thereby improving the driver's driving safety.

[0064] Specifically, when the display device is applied to a head-up display system, the light source module 10, waveguide 20, angle filter 30, displacement stage 40 and eye tracking module 50 in the display device are all arranged on the dashboard of the car, and the reflector 60 in the display device is arranged on the front windshield of the car.

[0065] Optionally, the image light emitted by the light source module 10 is projected to the coupling-in region of the waveguide 20, and the coupling-out region of the waveguide 20 couples out the image light after total reflection transmission through the waveguide 20 at a target exit angle, and projects the coupled-out image light to the angle filter 30. According to the position of the driver's eyes detected in real time by the eye tracking module 50, the translation stage 40 drives the angle filter 30 to move in the first plane, so that the position of the light-transmitting region 31 in the angle filter 30 after the movement is at the target position corresponding to the position of the eyes.

[0066] Furthermore, the image light selectively transmitted through the out-coupling area 22 of the waveguide 20 after being filtered by the angle filter 30 is projected onto the reflector 60 of the front windshield, that is, the image light in the out-coupling area of ​​the waveguide 20 coupled out from the target area where the light-transmitting area 31 in the angle filter 30 is located is projected onto the reflector 60, and then enters the human eye after being reflected by the reflector 60, while the image light and ambient light emitted from areas other than the target area in the out-coupling area are absorbed by the light-absorbing area 32 in the angle filter 30, thereby improving the screening effect on ambient light.

[0067] In this embodiment, the eye tracking module 50 is provided to track the eye position, so that when the eye position of the displacement stage 40 changes, the displacement stage 40 can drive the angle filter 30 to move to the target position corresponding to the eye position based on the tracking result of the eye tracking module 50, so that when the angle screening range of the angle filter 30 is small, the image light passing through the angle filter 30 moved to the target position can form a complete display image at the eye after entering the eye, thereby ensuring the display integrity of the display device and improving the display device's suppression effect on ambient light.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A display device, characterized in that: The display device comprises: A light source module, used for emitting image light; A waveguide, arranged in the light emitting direction of the light source module, for coupling out the image light at a target emitting angle, wherein the target emitting angle is within a set angle range; An angle filter is arranged at the light outlet of the waveguide, the angle filter comprises a light-transmitting area, and the light-transmitting area is used to selectively transmit the image light whose incident angle is within the set angle range; The displacement stage is mechanically connected to the angle filter, and the displacement stage is used to drive the angle filter to move so that the image light transmitted by the moved angle filter is incident on the human eye.

2. The display device according to claim 1, characterized in that The light-transmitting area includes a plurality of through holes distributed in an array, the inclination angles of the plurality of through holes are within the set angle range, and the inclination angles of the plurality of through holes gradually increase from the middle to the edge of the angle filter.

3. The display device according to claim 2, characterized in that: The angular screening range of each through hole is greater than or equal to for: Wherein, D is the relative distance between the centers of two adjacent through holes, D is less than or equal to the pupil radius of the human eye, and L is the relative distance between the human eye and the waveguide.

4. The display device according to claim 3, characterized in that: Each of the through holes is used to transmit light at an incident angle of The image light inside, N is the tilt angle of the through hole.

5. The display device according to claim 1, characterized in that The waveguide comprises an incoupling region and an outcoupling region; The coupling-in region is arranged in the light emitting direction of the light source module, and the coupling-in region is used to couple the image light projected onto the coupling-in region into the waveguide; The outcoupling region is used to couple out the image light transmitted by the waveguide at the target exit angle.

6. The display device according to claim 5, characterized in that: The light-transmitting area is used to receive the first image light coupled out by the target area in the outcoupling area, the target area is located at the position of the light-transmitting area, and the size of the light-transmitting area is smaller than the size of the outcoupling area.

7. The display device according to claim 6, characterized in that: The angle filter further comprises a light absorption region, and the light absorption region is arranged around the light transmission region; The light absorption region is used for absorbing second image light and ambient light, where the second image light is image light emitted from a region other than the target region in the outcoupling region.

8. The display device according to claim 5, characterized in that The waveguide is a two-dimensional pupil expansion waveguide, and any position of the outcoupling region of the two-dimensional pupil expansion waveguide is used to couple out the image light at the target exit angle.

9. The display device according to any one of claims 1 to 8, characterized in that: The display device further comprises an eye tracking module, and the eye tracking module is electrically connected to the displacement stage; The human eye tracking module is used to track the position of human eyes; The translation stage is used to drive the angle filter to move to a target position corresponding to the human eye position in a first plane, so that the image light transmitted by the angle filter moved to the target position enters the human eye, and the first plane is parallel to the plane where the waveguide is located.

10. The display device according to any one of claims 1 to 8, characterized in that: The display device further comprises a reflector, which is arranged in the light beam output direction of the angle filter and is used to reflect the image light and output it to human eyes.

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