CN215416254U - Projection display optical device - Google Patents

Abstract

The application relates to the technical field of projection display optics, and provides a projection display optical device, which comprises a light source assembly, wherein the light source assembly comprises: the light source group comprises a plurality of luminous pieces which are arranged in an array and can independently control light emission, and emergent light of the luminous pieces is parallel light. Compared with the prior art, the projection display optical device has the advantages that the light source group is formed by the plurality of luminous pieces which are arranged in the array and can independently control the light emission, and the light emission of different luminous pieces is respectively controlled to obtain projections with different shapes and sizes; meanwhile, because the emergent light of the light-emitting piece is parallel light, the parallel light can be directly projected to a projection plane, so that the projection display optical device does not need to be additionally provided with an optical component for converting the parallel light, the size of the projection display optical device can be very small, the light path is simple, and the transmission efficiency of the light is higher.

Description

Projection display optical device

Technical Field

The application belongs to the technical field of projection display optics, and particularly relates to a projection display optical device.

Background

The current mainstream Display systems displayed by the projector include DLP (Digital Light Processing), LCOS (Liquid Crystal on Silicon), 3LCD (Liquid Crystal Display), single-chip LCD, laser scanning, and the like. Except for the laser scanning technology, other projection technologies emit light through a light source, the light is shaped and then enters a display chip, a point light source needs to be converted into parallel light through a first lens, the parallel light is converged into the point light source again through a second lens, and then the point light source is converted into a surface light source with the required size through a third lens. However, the use of a large number of optical components makes the optical path complicated and also makes the size of the projector large.

Disclosure of Invention

The application aims to provide a projection display optical device, which aims to solve the technical problems that the existing projector needs to use more optical components to cause complex light path and the size of the projector is larger.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: there is provided a projection display optical device comprising a light source assembly comprising: the light source group comprises a plurality of luminous pieces which are arranged in an array and can independently control light emission, and emergent light of the luminous pieces is parallel light.

Furthermore, the projection display optical device further comprises a fixed focus lens, wherein the fixed focus lens is arranged on the light emitting path of the light source group and is used for focusing the parallel light emitted by the light source group.

Furthermore, the projection display optical device includes a plurality of light source assemblies, and a color combining prism disposed on the light-emitting paths of the light source assemblies, where the color combining prism is configured to combine the parallel light emitted from the light source assemblies into a beam of parallel light and then emit the beam of parallel light to the fixed-focus lens.

Further, the projection display optical device further comprises a control assembly connected with the light source group, and the control assembly can independently control the luminous intensity of each luminous element.

Furthermore, the light source assembly further comprises a driving flat cable for driving the light emitting element to emit light, and two ends of the driving flat cable are respectively electrically connected with the control assembly and the light emitting element.

Further, the light emitting member is a laser diode.

Furthermore, the projection display optical device further comprises a micro lens, and the micro lens is arranged between the light source assembly and the fixed-focus lens.

Further, the surface area of the fixed-focus lens is larger than the projection area of the parallel light emitted by the light source group.

Further, the substrate is a heat conducting member.

Compared with the prior art, the projection display optical device has the advantages that the light source group is formed by the plurality of luminous pieces which are arranged in the array and can independently control the light emission, and the light emission of different luminous pieces is respectively controlled to obtain projections with different shapes and sizes; meanwhile, because the emergent light of the light-emitting piece is parallel light, the parallel light can be directly projected to a projection plane, so that the projection display optical device does not need to be additionally provided with an optical component for converting the parallel light, the size of the projection display optical device can be very small, the light path is simple, and the transmission efficiency of the light is higher.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a first schematic structural diagram of an optical device for projection display according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a projection display optical device according to an embodiment of the present application.

Wherein, in the figures, the respective reference numerals:

1-a light source assembly; 11-a substrate; 12-a light source group; 121-a light emitting member; 13-driving the flat cable; 2-a fixed focus lens; 3-a color-combining prism; 4-micro lens.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, is not to be considered as limiting.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Referring to fig. 1, the optical device for projection display provided in the present application is now described, the optical device for projection display includes a light source assembly 1, the light source assembly 1 includes: the light source module comprises a substrate 11 and a light source group 12 packaged on the substrate 11, wherein the light source group 12 comprises a plurality of light emitting members 121 which are arranged in an array and can independently control light emission, and emergent light of the light emitting members 121 is parallel light. In specific implementation, the substrate 11 may also be a housing, as long as the light source group 12 can be encapsulated, and those skilled in the art can select and arrange the substrate according to actual needs; the light emitting element 121 may be a laser light emitting diode, or may be other light sources as long as it can directly emit parallel light, and those skilled in the art may select the arrangement according to actual needs. The mode of each parallel light source independently emitting light may be that each parallel light source has a control switch, and the control switch of each parallel light source is controlled by the control panel, or may be other modes, as long as the mode can independently control each parallel light source to emit light, and the mode is not limited herein, and the setting can be selected by a person skilled in the art according to actual needs. Since each parallel light source can independently emit light, and the plurality of parallel light sources emit parallel light toward the outside of the substrate 11, different parallel light sources are controlled to emit parallel light, and then the parallel light is projected onto a projection plane, so that projection of different shapes and sizes can be realized.

Compared with the prior art, the projection display optical device provided by the application has the advantages that the light source group 12 is formed by the plurality of luminous pieces 121 which are arranged in an array and can independently control to emit light, and the light emission of different luminous pieces 121 is respectively controlled to obtain projections with different shapes and sizes; meanwhile, since the emergent light of the light emitting member 121 is parallel light, the parallel light can be directly projected onto a projection plane, so that the projection display optical device does not need to be additionally provided with an optical component for converting the parallel light, the size of the projection display optical device can be very small, the light path is simple, and the transmission efficiency of the light is higher.

In an embodiment, referring to the drawings, the projection display optical device further includes a fixed focus lens 2, and the fixed focus lens 2 is disposed on the light exit path of the light source group 12 and is used for focusing the parallel light emitted from the light source group 12. Because the fixed focus lens 2 can enlarge or reduce the received parallel light, the parallel light emitted by the light source group 12 is projected to an external projection plane after being enlarged or reduced by the fixed focus lens 2, and then a required picture can be projected. Meanwhile, the fixed-focus lens 2 has the characteristics of high focusing speed, stable imaging quality and the like, and the arrangement of the fixed-focus lens 2 can also ensure that the imaging quality of the projection display optical device is stable.

In an embodiment, referring to fig. 2, the projection display optical device includes a plurality of light source modules 1, and a color combining prism 3 disposed on the light-emitting paths of the light source modules 1, where the color combining prism is configured to combine the parallel light emitted from the light source modules 1 into a beam of parallel light and then emit the beam of parallel light to the fixed-focus lens 2. In specific implementation, the emergent light of the light source assemblies 1 may be light of the same color or light of different colors. For example, when light to be projected is white light, the number of the light source assemblies 1 may be three, that is, the first light source assembly 1, the second light source assembly 1, and the third light source assembly 1, and respectively emit red, green, and blue parallel light, the color combining prism 3 may have a three-dimensional structure including six surfaces, that is, an upper surface, a lower surface, a left surface, a right surface, a front surface, and a rear surface, the first light source assembly 1 and the third light source assembly 1 may be respectively disposed on the left surface and the right surface of the color combining prism 3, and the second light source may be disposed behind the color combining prism 3; the red parallel light emitted by the first light source assembly 1 enters from the left surface of the color combining prism 3 and then emits from the front surface of the color combining prism 3, the blue parallel light emitted by the third light source assembly 1 enters from the right surface of the color combining prism 3 and then emits from the front surface of the color combining prism 3, the green parallel light emitted by the second light source enters from the rear surface of the color combining prism 3 and then emits from the front surface of the color combining prism 3, and the parallel light of the three colors can be converged into white light in front of the color combining prism 3 and then emitted to the fixed focus lens 2 for projection. Through the setting of color composition prism 3, can emit out after synthesizing the light of a plurality of light source module 1 that send the light of different colours for projection display optical device's range of application is wider.

In one embodiment, the projection display optical apparatus further includes a control component (not shown) connected to the light source set 12, and the control component can individually control the light intensity of each light emitting element 121. In specific implementation, the method for the control component to individually control the light emitting intensity of each light emitting element 121 is implemented by the prior art, for example, the control component may control the PWM or the current to realize the adjustment, which is not limited herein, as long as the control component can control the light emitting intensity of each light emitting element 121, and a person skilled in the art can select the setting according to actual needs. Since the control component can individually control the light-emitting intensity of each light-emitting member 121, the user can adjust the light-emitting intensity of each light-emitting member 121 according to the actual projection requirement, thereby meeting the requirement of the user on the projection graph.

Further, as a specific embodiment of the projection display optical device provided in the present application, the light source assembly 1 further includes a driving flat cable 13 for driving the light emitting element 121 to emit light, and two ends of the driving flat cable 13 are electrically connected to the control assembly and the light emitting element 121 respectively. The control component can be electrically connected with the light emitting component 121 by driving the flat cable 13, so that the control component can control the light emitting intensity of the light emitting component 121.

In one embodiment, the projection display optical device further includes a microlens 4, and the microlens 4 is disposed between the light source assembly 1 and the fixed-focus lens 2. Because the laser emitting has a certain divergence angle, although the divergence angle is very small, the light emitting element 121 can be influenced to emit parallel light, and the light emitted by the light emitting element 121 can be collimated and then projected by arranging the micro lens 4 between the light source assembly 1 and the fixed-focus lens 2, so that the light passing through the micro lens 4 is ensured to be the parallel light.

In one embodiment, the surface area of the fixed-focus lens 2 is larger than the projection area of the parallel light emitted from the light source group 12. Therefore, all the parallel light emitted by the light source group 12 can be received by the fixed-focus lens 2, and the parallel light emitted by the light source group 12 can be fully utilized.

In one embodiment, the light emitting element 121 is a laser diode. The light emitted by the common light source is transmitted along all directions, the divergence angle is large, the light dispersion of the laser is small, and the laser is almost emitted along the parallel direction, so that the requirement that the light-emitting element 121 emits the parallel light can be met by adopting the laser diode as the light-emitting element 121. Of course, it is understood that the light emitting element 121 may also be other light emitting devices capable of emitting parallel light, as long as the light emitting device can directly emit parallel light, and those skilled in the art can select the arrangement according to actual needs.

In one embodiment, the substrate 11 is a heat conducting member. During specific implementation, the substrate 11 can be made into various shapes, the volume of the package of the substrate 11 to the array light source can be increased according to actual needs, the substrate 11 is set to be a heat conducting piece, heat of the array light source can be dissipated through heat conductivity of the substrate 11, and overheating of the array light source is avoided. Optionally, the substrate 11 is a copper substrate, an aluminum substrate, or a ceramic substrate, and in specific implementation, a user may select settings according to actual needs.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (9)

1. Projection display optical apparatus, comprising a light source assembly, said light source assembly comprising: the light source group comprises a plurality of luminous pieces which are arranged in an array and can independently control light emission, and emergent light of the luminous pieces is parallel light.

2. The optical device for projection display according to claim 1, further comprising a fixed focus lens disposed on the light exit path of the light source set and used for focusing the parallel light emitted from the light source set.

3. The optical device for projection display according to claim 2, wherein the optical device for projection display comprises a plurality of the light source modules, and a color combining prism disposed on the light-emitting paths of the light source modules, and the color combining prism is configured to combine the parallel light emitted from the light source modules into a parallel light beam and emit the parallel light beam to the fixed-focus lens.

4. The projection display optical apparatus according to claim 1, further comprising a control unit connected to the light source group, the control unit being capable of individually controlling the intensity of light emitted from each of the light emitting elements.

5. The optical device for projection display of claim 4, wherein the light source module further comprises a driving cable for driving the light emitting element to emit light, and two ends of the driving cable are electrically connected to the control module and the light emitting element, respectively.

6. The projection display optical apparatus according to claim 2 or 3, further comprising a microlens provided between the light source module and the fixed-focus lens.

7. The projection display optical device according to claim 2 or 3, wherein the surface area of the fixed-focus lens is larger than the projection area of the parallel light emitted from the light source group.

8. The projection display optical apparatus according to any one of claims 1 to 5, wherein the light emitting member is a laser diode.

9. The projection display optical apparatus according to any one of claims 1 to 5, wherein the substrate is a heat conductive member.

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