CN220626838U - Projection module and car light - Google Patents

Abstract

The utility model discloses a projection module and a car lamp, and relates to the technical field of optical projection structures. The projection module includes: a light source that emits an illumination beam; a collimator lens located on a propagation path of the illumination beam; the projection element is positioned on the emergent path of the collimating lens and comprises a first substrate and a plurality of microprisms positioned on the first substrate, wherein the microprisms comprise microplanes, and the included angle between each microplane and the first direction is an inclined angle; the first direction is parallel to the plane of the first substrate; one microprism corresponding to one optical projection channel; a second substrate positioned on the optical path between the collimating lens and the projection element; the first substrate or the second substrate comprises an optical device, and the optical device comprises a plurality of switch units for electrically controlling the opening or closing of the optical projection channel. The embodiment of the utility model realizes flexible control of the opening and closing of the optical projection channel.

Description

Projection module and car light

Technical Field

The present disclosure relates to optical projection structures, and particularly to a projection module and a vehicle lamp.

Background

Microlens arrays (MLAs) are a group of closely manufactured microlenses or "microlenses". The array is a custom designed module. Its optical principle is based on a combination of illumination optics and projection optics. First, the light emitted by the light source is projected onto the field lens array, and then converged on the focal plane of the projection lens array. The focal plane has a projection source with a plurality of micro-shading openings through which light can project bright and dark light patterns. Microlens arrays are widely used, such as vehicle lighting systems, projection displays.

In the prior art, the opening and closing of the optical projection channels in the microlens array are controlled by arrayed light emitting diodes, and the optical projection channels corresponding to the light emitting diodes are closed by controlling the light emitting diodes of the light emitting diodes to emit no light.

Disclosure of Invention

The embodiment of the utility model provides a projection module and a car lamp, which are used for flexibly controlling the opening and closing of an optical projection channel.

In a first aspect, the present utility model provides a projection module, including:

a light source that emits an illumination beam;

a collimator lens located on a propagation path of the illumination beam;

the projection element is positioned on the emergent path of the collimating lens and comprises a first substrate and a plurality of microprisms positioned on the first substrate, wherein the microprisms comprise microplanes, and an included angle between each microplane and a first direction is an inclined angle; the first direction is parallel to the plane where the first substrate is located;

one of the microprisms corresponds to one of the optical projection channels;

a second substrate positioned on the optical path between the collimating lens and the projection element;

the first substrate or the second substrate comprises an optical device, the optical device comprises a plurality of switch units used for electrically controlling the opening or closing of the optical projection channel, when the optical projection channel is opened, the light in the optical projection channel keeps the original propagation direction to continue to propagate forwards, and when the optical projection channel is closed, the light in the optical projection channel is completely blocked from continuing to propagate or is scattered and cannot propagate to a far place.

Further, the field lens array is arranged on one side surface of the second substrate facing the collimating lens and comprises a plurality of field lenses.

Further, the projection module further comprises a projection lens array, wherein the projection lens array is arranged on the surface of one side of the second substrate, which faces the projection element, and comprises a plurality of projection lenses;

the field lenses are in one-to-one correspondence with the projection lenses and are coaxially arranged.

Further, the projection module further comprises a mask layer, wherein the mask layer is positioned between the field lens array and the projection lens array and comprises a plurality of projection patterns;

the projection patterns are in one-to-one correspondence with the field lenses and the projection lenses, and the optical projection channels are formed.

Further, the optical device is a liquid crystal panel, and the liquid crystal panel includes a plurality of sub-pixels, and the sub-pixels serve as the switching units.

Further, the subpixels are arranged in one-to-one correspondence with the microprisms.

Further, the liquid crystal panel includes a first electrode, a second electrode, and a liquid crystal layer;

the liquid crystal layer includes a plurality of liquid crystal molecules configured to rotate under the driving of an electric field generated by the first electrode and the second electrode.

Further, the liquid crystal panel includes a first electrode, a second electrode, and a liquid crystal layer;

the liquid crystal layer is positioned between the first electrode and the second electrode;

the liquid crystal layer includes a polymer dispersed liquid crystal including liquid crystal molecules configured to rotate under the drive of an electric field generated by the first electrode and the second electrode, and a matrix.

Further, the liquid crystal panel includes a plurality of the first electrodes and one of the second electrodes; the first electrodes are arranged in an array along the first direction and the second direction, and the first direction is perpendicular to the second direction;

or,

the liquid crystal panel comprises a plurality of first electrodes and a plurality of second electrodes; the plurality of first electrodes extend in the first direction and are arranged in a second direction, and the plurality of second electrodes extend in the second direction and are arranged in the first direction.

In a second aspect, the present utility model provides a vehicle lamp, including the projection module set in the first aspect.

In an embodiment of the present utility model, the optical device includes a plurality of switch units for electrically controlling the optical projection channel to be opened or closed. The parallel light is projected to the optical projection channel through the collimating lens. When the optical projection channel is opened, the light in the optical projection channel keeps the original propagation direction to continue to propagate forward. When the optical projection channel is closed, the light in the optical projection channel is blocked completely from continuing or scattered from propagating to a distant place. The light projected to the projection element is controlled by controlling the opening or closing of the optical projection channel, so that the emergent light type can be adaptively changed according to the requirement. The flexible control of the opening and closing of the optical projection channel is realized.

Drawings

Fig. 1 is a schematic structural diagram of a first projection module according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a second projection module according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram showing the light distribution when the optical projection channels are all opened according to the embodiment of the present utility model;

FIG. 4 is a schematic diagram showing the light distribution when the number of optical projection channels is partially closed according to an embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a third projection module according to an embodiment of the present utility model;

fig. 6 is a schematic structural diagram of a fourth projection module according to an embodiment of the present utility model;

fig. 7 is a schematic structural diagram of a fifth projection module according to an embodiment of the present utility model;

FIG. 8 is a schematic top view of an optical device according to an embodiment of the present utility model;

FIG. 9 is a schematic cross-sectional view taken along line AA' of FIG. 8;

FIG. 10 is a schematic top view of another optical device according to an embodiment of the present utility model;

FIG. 11 is a schematic view showing a sectional structure along BB' in FIG. 10;

FIG. 12 is a schematic cross-sectional view of another optical device according to an embodiment of the present utility model;

FIG. 13 is a schematic cross-sectional view of another optical device according to an embodiment of the present utility model;

FIG. 14 is a schematic top view of another optical device according to an embodiment of the present utility model;

fig. 15 is a schematic structural diagram of a vehicle lamp according to an embodiment of the present utility model.

Detailed Description

In order to further describe the technical means and effects adopted for achieving the preset purposes of the present utility model, the following detailed description refers to the specific implementation, structure, characteristics and effects of a display panel defect detection device according to the present utility model with reference to the accompanying drawings and preferred embodiments.

Fig. 1 is a schematic structural diagram of a first projection module according to an embodiment of the utility model, and referring to fig. 1, the projection module includes a light source 100, a collimating lens 110, a projection element 120, and a second substrate 130. The projection element 120 includes a first substrate 121 and a plurality of microprisms 122 located on the first substrate 121. Wherein the light source 100 emits an illumination beam. The collimator lens 110 is located on the propagation path of the illumination beam. The projection element 120 is located on the exit path of the collimator lens 110. The illumination beam emitted from the light source 100 is projected onto the collimator lens 110, transmitted through the collimator lens 110 as parallel light, and projected onto the projection element 120.

The microprisms 122 comprise microplates 123, the microplates 123 being inclined at an inclination angle θ to the first direction X. The first direction X is parallel to the plane of the first substrate 121. The absolute value of the angle between the micro-plane 123 and the first direction X is equal to the angle between the micro-plane 123 and the plane of the first substrate 121. The micro prism 122 receives the parallel light projected by the collimating lens 110, and projects the light after refraction of the micro plane 123 to form a light spot. The tilt angle θ of the microprisms 122 determines the position of the spot after deflection by the microprisms 122, i.e. the tilt angle θ of the microprisms 122 determines the position of the illumination range after deflection by the microprisms 122. One microprism 122 corresponds to one optical projection channel 134. The light emitted from the optical projection channel 134 is projected to the micro-prism 122, and is deflected to a predetermined angle and a predetermined position by the micro-prism 122. By configuring the exit directions of the light rays of the plurality of optical projection channels 134, the effect of converging to form a desired light distribution is achieved.

The second substrate 130 is located on the optical path between the collimating lens 110 and the projection element 120. The second substrate 130 includes an optical device 140, and the optical device 140 includes a plurality of switching units 141 for electrically controlling the opening or closing of the optical projection channel 134. When the switch unit 141 is turned on, the parallel light projected by the collimator lens 110 passes through the optical projection channel 134, and keeps the original propagation direction to continue to propagate forward to the projection element 120. When the switching unit 141 is turned off, the parallel light projected to the optical projection channel 134 through the collimator lens 110 is completely blocked by the switching unit 141 from continuing to propagate, or the parallel light projected to the optical projection channel 134 through the collimator lens 110 is scattered to form a frosted glass state or an opaque milky state, and cannot propagate to a distant place. The distance between the projection module and the remote location is greater than or equal to 25 meters.

Referring to fig. 2, the first substrate 120 may also be used as the optical device 140, and the switch unit 141 may be disposed on the first substrate 121. The switching unit 141 may implement flexible control of opening and closing of the optical projection channel by controlling light propagation in the optical projection channel 134 based on the same control method, which is not described herein.

It should be noted that, as shown in fig. 1 and fig. 2, the projection module is turned on or off by controlling the switch unit 141 to control the light propagation in the optical projection channel 134, and is particularly suitable for an application scene requiring an adaptive variable light type, such as an adaptive high beam system. The self-adaptive high beam system is an intelligent high beam control system capable of adaptively changing high beam patterns according to road conditions. According to the vehicle position in the front view of the vehicle, the high beam light type is adaptively changed so as to avoid glaring other road users.

In an embodiment of the present utility model, the optical device 140 includes a plurality of switch units 141 for electrically controlling the optical projection channel 134 to be opened or closed. The parallel light is projected to the optical projection channel 134 through the collimator lens 110. When the optical projection channel 134 is opened, the light in the optical projection channel 134 keeps the original propagation direction to continue to propagate forward. With optical projection channel 134 closed, light in optical projection channel 134 is completely blocked from continuing or scattered from propagating to the distant location. By controlling the opening or closing of the optical projection channel 134, the light projected onto the projection element 120 is controlled, so that the emitted light pattern can be adaptively changed according to the need. Flexible control of opening and closing of the optical projection channel 134 is achieved.

Fig. 3 is a schematic diagram of light distribution when all the optical projection channels are opened, referring to fig. 1-3, the switch units 141 in the optical device 140 are all opened, the optical projection channels 134 are all opened, and light can pass through the optical projection channels 134, keep the original propagation direction to continue to propagate forward to the projection element 120, and be projected by the projection element 120 to form the light distribution shown in fig. 3.

Fig. 4 is a schematic diagram of light distribution when a part of the optical projection channels are closed, and referring to fig. 1, 2 and 4, a part of the switch units 141 in the optical device 140 are closed, and a part of the optical projection channels 134 are closed. The light may pass through the open optical projection channel 134, maintaining the original propagation direction forward to the projection element 120. And a dark region is formed at a position corresponding to the light distribution of the closed optical projection channel 134. The dark area is the middle position of the light distribution as shown in fig. 4.

Illustratively, referring to fig. 1, the number of light sources 100 may be customized according to the requirements, and in the embodiment of the present utility model, the number of light sources 100 is 1. In other embodiments, the number of the light sources 100 may be plural, the plural light sources 100 are formed into a light source array, and the light sources 100 in the light source array may be uniformly controlled by the switch, and part of the light sources in the light source array may not be individually turned on, so that the light source array may be regarded as one uniform light source.

Fig. 5 is a schematic structural diagram of a third projection module according to an embodiment of the utility model, and referring to fig. 5, the projection module further includes a field lens array 131. The field lens array 131 is disposed on a surface of the second substrate 130 facing the collimating lens 110. The field lens array 131 is located between the second substrate 130 and the collimating lens 110. The field lens array 131 includes a plurality of field lenses 1310. The illumination beam emitted by the light source 100 is projected to the collimating lens 110, the parallel light formed by the collimating lens 110 is projected to the second substrate 130, and the parallel light is focused by the field lens array 131 disposed on the second substrate 130 and facing one side of the collimating lens 110, and then projected to the micro prism 122. Since the field lens array 131 breaks up light, brightness uniformity of light distribution is improved.

Illustratively, referring to fig. 5, field lens 1310 includes a stack of first field lens film layer 1311 and second field lens film layer 1312. The first field lens film 1311 is located between the second field lens film 1312 and the second substrate 130, and the second field lens film 1312 conformally covers a side of the first field lens film 1311 away from the second substrate 130. The first field lens film 1311 and the second field lens film 1312 may comprise different materials for eliminating chromatic aberration generated during the projection process, and in other embodiments, the field lens 1310 may further comprise a film, which is not limited in this embodiment of the utility model.

Fig. 6 is a schematic structural diagram of a fourth projection module according to an embodiment of the utility model, and referring to fig. 6, the projection module further includes a projection lens array 132. The projection lens array 132 is disposed on a side surface of the second substrate 130 facing the projection element 120. The projection lens array 132 is located between the second substrate 130 and the microprisms 122. Projection lens array 132 includes a plurality of projection lenses 1320. The field lenses 1310 are in one-to-one correspondence with the projection lenses 1320, and the field lenses 1310 are coaxially arranged with the projection lenses 1320. The primary optical axes of the one-to-one field lenses 1310 coincide with the primary optical axis of the projection lens 1320, and the one-to-one field lenses 1310 are not decentered with the projection lens 1320.

Illustratively, referring to FIG. 6, projection lens 1320 includes a stack of first projection lens film 1321 and second projection lens film 1322. The first projection lens film 1321 is disposed between the second projection lens film 1322 and the second substrate 130, and the second projection lens film 1322 conformally covers a side of the first projection lens film 1321 away from the second substrate 130. The first projection lens film 1321 and the second projection lens film 1322 comprise different materials for eliminating chromatic aberration generated during the projection process. In other implementations, projection lens 1320 may also include a film layer, as embodiments of the utility model are not limited in this respect.

Fig. 7 is a schematic structural diagram of a fifth projection module according to an embodiment of the utility model, and referring to fig. 7, the projection module further includes a mask layer 133. Wherein, the mask layer 133 is located between the field lens array 131 and the projection lens array 132, and the mask layer 133 includes a plurality of projection patterns. The projected pattern corresponds one-to-one with field lens 1310 and projection lens 1320 and forms optical projection channel 134.

It should be noted that, as shown in the projection module of fig. 7, the light is blocked by the mask layer 133, so that the shape of the light beam projected onto the projection element 120 can be changed, and the projection module is suitable for a scene requiring flexible control of the shape of the projected light beam. For example, in a scene where low beam projection is required. In a scene where high beam projection is required, the mask layer 133 may not be provided.

Fig. 8 is a schematic top view of an optical device according to an embodiment of the present utility model, fig. 9 is a schematic cross-sectional view along AA' in fig. 8, and referring to fig. 8 and 9, the optical device 140 is a liquid crystal panel, and the liquid crystal panel includes a plurality of sub-pixels 150, and the sub-pixels 150 serve as a switching unit 141. The plurality of sub-pixels 150 are arrayed along the first direction X and the second direction Y. The opening or closing of the optical projection channel 134 is controlled by controlling the opening or closing of the sub-pixels 150 in the liquid crystal panel, thereby controlling the brightness of the light beam transmitted by the sub-pixels 150.

Alternatively, referring to fig. 1, 8 and 9, since the optical projection channels 134 are disposed in one-to-one correspondence with the microprisms 122, the optical projection channels 134 are disposed in one-to-one correspondence with the sub-pixels 150, so that the sub-pixels 150 are disposed in one-to-one correspondence with the microprisms 122. One sub-pixel 150 controls the opening or closing of a corresponding one of the optical projection channels 134, thereby controlling the light beam deflected by a corresponding one of the microprisms 122, and flexibly controlling the light pattern of the outgoing light beam.

Fig. 10 is a schematic top view of another optical device according to an embodiment of the present utility model, fig. 11 is a schematic cross-sectional view along BB' in fig. 10, and referring to fig. 10 and 11, one optical projection channel 134 is disposed corresponding to a plurality of sub-pixels 150 (in fig. 10, one optical projection channel 134 is disposed corresponding to four sub-pixels 150, but not limited thereto). The optical projection channels 134 are arranged in a one-to-one correspondence with the microprisms 122, so that one microprism 122 is arranged in correspondence with a plurality of sub-pixels 150. In other embodiments, a plurality of microprisms 122 may be disposed corresponding to one subpixel 150. Thus, one sub-pixel 150 is disposed corresponding to the plurality of optical projection channels 134, and one sub-pixel 150 simultaneously controls the opening or closing of the plurality of optical projection channels 134.

1-11, the micro prisms 122 in the projection element 120 are arranged in an array along a first direction X and a second direction Y, and the light source 100, the collimating lens 110, and the projection element 120 are arranged along a third direction Z. The first direction X, the second direction Y and the third direction Z constitute a cartesian coordinate system.

Alternatively, referring to fig. 8-11, the optical device 140 includes a liquid crystal panel. The liquid crystal panel includes a first electrode 155, a second electrode 156, and a liquid crystal layer. The liquid crystal layer includes a plurality of liquid crystal molecules 157, and the liquid crystal molecules 157 are configured to rotate under the driving of an electric field generated by the first electrode 155 and the second electrode 156.

Illustratively, when a voltage is applied across the first electrode 155 and the second electrode 156, an electric field is generated between the first electrode 155 and the second electrode 156, driving the liquid crystal molecules 157 to rotate, and light can pass through the sub-pixel 150. The sub-pixel 150 is in an on state, the optical projection channel 134 corresponding to the sub-pixel 150 is on, and the light in the optical projection channel 134 keeps the original propagation direction to continue to propagate forward. When no voltage is applied to the first electrode 155 and the second electrode 156, no electric field is generated between the first electrode 155 and the second electrode 156, the liquid crystal molecules 157 are not driven to rotate, and light cannot pass through the sub-pixel 150. The sub-pixel 150 is in an off state and the optical projection channel 134 corresponding to the sub-pixel 150 is off. The light in the optical projection channel 134 is completely blocked from continuing to propagate.

Referring to fig. 8 to 11, the liquid crystal panel further includes a first substrate 151 and a second substrate 152, a first electrode 155 is disposed on the first substrate 151, and a second electrode 156 is disposed on the second substrate 152. The liquid crystal layer is located between the first electrode 155 and the second electrode 156.

Fig. 12 is a schematic cross-sectional view of another optical device according to an embodiment of the utility model, and referring to fig. 12, a first electrode 155 and a second electrode 156 are disposed on a first substrate 151. The liquid crystal layer is located on the same side of the first electrode 155 and the second electrode 156.

Referring to fig. 8 to 12, the liquid crystal panel further includes a first polarizer 153, a second polarizer 154, and a pixel driving circuit. The first polarizer 153 is located at a side of the first substrate 151 remote from the second substrate 152. The second polarizer 154 is located at a side of the second substrate 152 remote from the first substrate 151. The pixel driving circuit includes a thin film transistor 158. The pixel driving circuit may further include a capacitor, which is not limited in the embodiment of the present utility model.

Fig. 13 is a schematic cross-sectional structure of another optical device according to an embodiment of the present utility model, and referring to fig. 13, a liquid crystal panel includes a first electrode 155, a second electrode 156, and a liquid crystal layer. The liquid crystal layer is located between the first electrode 155 and the second electrode 156. The liquid crystal layer includes polymer dispersed liquid crystal 159, and polymer dispersed liquid crystal 159 includes liquid crystal molecules 157 and a matrix 1590. The liquid crystal molecules 157 are configured to rotate under the driving of the electric field generated by the first electrode 155 and the second electrode 156.

Illustratively, when a voltage is applied across the first electrode 155 and the second electrode 156, an electric field is generated between the first electrode 155 and the second electrode 156 to drive the liquid crystal molecules 157 to rotate, which is the optical axis orientation of the liquid crystal molecules 157, and when the refractive index of the liquid crystal molecules 157 matches the refractive index of the matrix 1590, a transparent state is exhibited. Light may be transmitted through the sub-pixels 150. The sub-pixel 150 is in an on state, the optical projection channel 134 corresponding to the sub-pixel 150 is on, and the light in the optical projection channel 134 keeps the original propagation direction to continue to propagate forward.

When no voltage is applied to the first electrode 155 and the second electrode 156, no electric field is generated between the first electrode 155 and the second electrode 156, the liquid crystal molecules 157 are not driven to rotate, the optical axes of the liquid crystal molecules 157 are in a free orientation, the refractive index of the liquid crystal molecules 157 is not matched with that of the matrix 1590, and the liquid crystal molecules are scattered to be in an opaque milky state or a semitransparent state when light passes through. The sub-pixel 150 is in the off state and the optical projection channel 134 corresponding to the sub-pixel 150 is turned off, and light in the optical projection channel 134 is scattered and cannot propagate to the distant place.

Alternatively, referring to fig. 8 and 9, the liquid crystal panel includes a plurality of first electrodes 155 and one second electrode 156. The plurality of first electrodes 155 are arranged in an array along the first direction X and the second direction Y. The first direction X is perpendicular to the second direction Y. In the embodiment of the present utility model, different voltages are provided for different first electrodes 155 through the first electrodes 155 which are independently and in an array, so that independent control of turning on or off the sub-pixels 150 can be realized through the voltages provided for the first electrodes 155.

Fig. 14 is a schematic top view of another optical device according to an embodiment of the present utility model, and referring to fig. 14, a liquid crystal panel includes a plurality of first electrodes 155 and a plurality of second electrodes 156. The plurality of first electrodes 155 extend in the first direction X and are arranged in the second direction Y, and the plurality of second electrodes 56 extend in the second direction Y and are arranged in the first direction X. The first electrode 155 and the second electrode 156 cross each other in different layers, and the sub-pixel 150 is formed at the crossing position of the first electrode 155 and the second electrode 156. Control of turning on or off the sub-pixel 150 is achieved by the first electrode 155 extending in the first direction X and the second electrode 156 extending in the second direction Y. It should be noted that other devices may be used as the optical device 140 in addition to the liquid crystal panel.

In one embodiment, the optics 140 employs an electronically controlled switch that controls the flipping of the shade unit and a shade unit. By controlling the flip angle of the light shielding unit, the opening or closing of the optical projection channel 134 is controlled.

Based on the same technical conception, the embodiment of the utility model also provides a car lamp. Fig. 15 is a schematic structural diagram of a vehicle lamp according to an embodiment of the present utility model, and as shown in fig. 15, the vehicle lamp includes a projection module according to any one of the embodiments of the present utility model. Therefore, the vehicle lamp provided by the embodiment of the utility model has the corresponding beneficial effects of the projection module provided by the embodiment of the utility model, and the description is omitted here.

The present utility model is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalent changes and variations in the above-mentioned embodiments can be made by those skilled in the art without departing from the scope of the present utility model.

Claims (10)

1. A projection module comprising a light source that emits an illumination beam, the projection module further comprising:

a collimator lens located on a propagation path of the illumination beam;

the projection element is positioned on the emergent path of the collimating lens and comprises a first substrate and a plurality of microprisms positioned on the first substrate, wherein the microprisms comprise microplanes, and an included angle between each microplane and a first direction is an inclined angle; the first direction is parallel to the plane where the first substrate is located;

one of the microprisms corresponds to one of the optical projection channels;

a second substrate positioned on the optical path between the collimating lens and the projection element;

the first substrate or the second substrate comprises an optical device, the optical device comprises a plurality of switch units used for electrically controlling the opening or closing of the optical projection channel, when the optical projection channel is opened, the light in the optical projection channel keeps the original propagation direction to continue to propagate forwards, and when the optical projection channel is closed, the light in the optical projection channel is completely blocked from continuing to propagate or is scattered and cannot propagate to a far place.

2. The projection module of claim 1, further comprising a field lens array disposed on a side surface of the second substrate facing the collimating lens, the field lens array comprising a plurality of field lenses.

3. The projection module of claim 2, further comprising a projection lens array disposed on a side surface of the second substrate facing the projection element, the projection lens array comprising a plurality of projection lenses;

the field lenses are in one-to-one correspondence with the projection lenses and are coaxially arranged.

4. The projection module of claim 3, further comprising a mask layer positioned between the field lens array and the projection lens array, comprising a plurality of projected patterns;

the projection patterns are in one-to-one correspondence with the field lenses and the projection lenses, and the optical projection channels are formed.

5. The projection module of claim 1, wherein the optical device is a liquid crystal panel, the liquid crystal panel including a plurality of sub-pixels, the sub-pixels serving as the switching units.

6. The projection module of claim 5, wherein the subpixels are disposed in one-to-one correspondence with the microprisms.

7. The projection module of claim 5, wherein the liquid crystal panel comprises a first electrode, a second electrode, and a liquid crystal layer;

the liquid crystal layer includes a plurality of liquid crystal molecules configured to rotate under the driving of an electric field generated by the first electrode and the second electrode.

8. The projection module of claim 5, wherein the liquid crystal panel comprises a first electrode, a second electrode, and a liquid crystal layer;

the liquid crystal layer is positioned between the first electrode and the second electrode;

the liquid crystal layer includes a polymer dispersed liquid crystal including liquid crystal molecules configured to rotate under the drive of an electric field generated by the first electrode and the second electrode, and a matrix.

9. The projection module of claim 7 or 8, wherein the liquid crystal panel includes a plurality of the first electrodes and one of the second electrodes; the first electrodes are arranged in an array along the first direction and the second direction, and the first direction is perpendicular to the second direction;

or,

the liquid crystal panel comprises a plurality of first electrodes and a plurality of second electrodes; the plurality of first electrodes extend in the first direction and are arranged in a second direction, and the plurality of second electrodes extend in the second direction and are arranged in the first direction.

10. A vehicle lamp comprising at least one projection module according to any one of claims 1-9.