CN218122458U - Light source device - Google Patents

Abstract

The application discloses a light source device. The light source device comprises a first light source, an adjustable element, a polarization beam splitting element, a first excited light source, a first light combining element and a light homogenizing element; when the adjustable element is in a first state, a light beam emitted by the first light source enters the first excited light source along a first light path through the polarization beam splitting element, and the first excited light source is excited by the light beam emitted by the first light source to generate first excited light; when the adjustable element is in a second state, the light beam emitted by the first light source passes through the polarization light splitting element, is combined with the first excited light at the first light combining element along a second light path, and is emitted into the light homogenizing element for homogenizing after being combined. The light source device obtains stimulated light by introducing the light source and deexcitation of the light source, can take advantages of various light sources into consideration, and can balance comprehensive optical properties such as brightness, color gamut, cost, picture effect and the like to a certain extent.

Description

Light source device

Technical Field

The present application relates to the field of projection display, and in particular, to a light source device.

Background

In projection display products, light source devices are very important components, whose function is to convert light rays of different colors, different angular distributions, different brightnesses and different shapes into uniform light spots which impinge on the active area of the display chip.

Currently, the mainstream light sources in projection display products include light-emitting diodes (LEDs), laser phosphors, and three-color lasers, which have excellent characteristics in brightness, color, lifetime, and energy consumption. However, it is difficult to realize high brightness in the LED light source, and the three-color laser light source has speckle trouble, and thus ideal image quality cannot be obtained.

Disclosure of Invention

In view of this, the present application provides a light source device, which can balance the advantages of multiple light sources and balance the overall optical properties such as brightness, color gamut, cost, and picture effect to a certain extent.

In a first aspect, the present application provides a speckle suppression element, where a light source device includes a first light source, an adjustable element, a polarization splitting element, a first excited light source, a first light combining element, and a light homogenizing element;

when the adjustable element is in a first state, a light beam emitted by the first light source passes through the polarization light splitting element and is emitted into the first excited light source along the first light path, and the first excited light source is excited by the light beam emitted by the first light source to generate first excited light;

when the adjustable element is in a second state, the light beam emitted by the first light source passes through the polarization light splitting element, is combined with the first excited light at the first light combining element along a second light path, and is emitted into the light homogenizing element for homogenizing after light combination.

Optionally, the tunable element comprises a target region and a polarization conversion region;

the first state is that the polarization conversion area is positioned on the first light path and is used for converting the polarization state of the light beam emitted by the first light source;

the second state is that the target area is positioned on the second light path and used for carrying out speckle suppression on the light beam emitted by the first light source or transmitting the light beam emitted by the first light source.

Optionally, a collimating element and at least one of a beam expanding element and a speckle reduction element are further disposed on the second optical path.

Optionally, the first state is that the adjustable element is located on the first light path, and the adjustable element is configured to convert a polarization state of a light beam emitted by the first light source;

the second state is that the tunable element is not located on the second optical path.

Optionally, the second light path is further provided with a collimating element, and at least two of the first speckle suppression element, the beam expansion element and the second speckle suppression element.

Optionally, the light source device further includes a second light source, and an optical path of a light beam emitted by the second light source is overlapped with the second optical path after passing through the polarization beam splitter.

Optionally, a speckle suppression element and a collimation element are further disposed on the first optical path.

Optionally, the light source device further includes a target light source, a second light combining element, and a focusing collimating element, where a light beam emitted from the target light source is combined with the excited light at the second light combining element, and the combined light passes through the focusing collimating element and enters the first light combining element.

Optionally, the tunable element is a polarization modulating element;

the first state represents that the working voltage of the polarization regulating element is a first voltage, and the polarization state of the light beam passing through the polarization regulating element in the first state is a first polarization state;

the second state indicates that the working voltage of the polarization control element is the second voltage, the polarization state of the light beam passing through the polarization control element in the second state is the second polarization state, and the polarization directions of the light beam in the first polarization state and the light beam in the second polarization state are orthogonal.

Optionally, a second excited light source is disposed on the second light path, the light beam emitted from the first light source enters the second excited light source, the second excited light source is excited by the light beam emitted from the first light source to generate second excited light, and the second excited light and the first excited light are combined at the first light combining element.

The light source device provided by the application comprises a first light source, an adjustable element, a polarization light splitting element, a first excited light source, a first light combining element and a light homogenizing element; when the adjustable element is in a first state, a light beam emitted by the first light source enters the first excited light source along a first light path through the polarization beam splitting element, and the first excited light source is excited by the light beam emitted by the first light source to generate first excited light; when the adjustable element is in a second state, the light beam emitted by the first light source passes through the polarization light splitting element, is combined with the first excited light at the first light combining element along a second light path, and is emitted into the light homogenizing element for homogenizing after being combined. The light source device obtains stimulated light by introducing the light source and deexcitation of the light source, can take advantages of various light sources into consideration, and can balance comprehensive optical properties such as brightness, color gamut, cost, picture effect and the like to a certain extent.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numerals generally refer to like parts. Wherein:

FIG. 1 is a schematic structural diagram of an adjustable element provided in the present application

Fig. 2 is a schematic structural diagram of a light source device provided in the present application;

FIG. 3 is a schematic structural view of another adjustable element provided herein;

fig. 4 is a schematic structural diagram of another light source device provided in the present application;

fig. 5 is a schematic structural diagram of another light source device provided in the present application;

fig. 6 is a schematic structural diagram of another light source device provided in the present application.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the 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. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort shall fall within the protection scope of the present application. Moreover, while the disclosure herein has been presented in terms of exemplary embodiment or embodiments, it is to be understood that each aspect of the disclosure can independently be implemented as a single unitary embodiment. The embodiments and features of the embodiments described below can be combined with each other without conflict.

In the embodiments of the present application, "at least one" means one or more, "a plurality" means two or more. The use of "first," "second," and similar terms in this application do not denote any order, quantity, or importance, but rather the description is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The term "and/or" includes any and all combinations of one or more of the associated listed items. It is to be understood that the terms "upper", "lower", "inner", "outer", "front", "back", and the like are used merely for convenience in describing the present application and for simplicity in description, and are not intended to imply or imply any limitations on the present application.

In order to thoroughly understand the present application, a detailed description will be provided below in order to explain the technical solution of the present application. The following detailed description of the preferred embodiments of the present application, however, will suggest that the present application may have other embodiments in addition to these detailed descriptions.

In some embodiments, the light source device includes a first light source, an adjustable element, a polarization splitting element, a first excited light source, a first light combining element, and a light homogenizing element; when the adjustable element is in a first state, a light beam emitted by the first light source enters the first excited light source along a first light path through the polarization beam splitting element, and the first excited light source is excited by the light beam emitted by the first light source to generate first excited light; when the adjustable element is in a second state, the light beam emitted by the first light source passes through the polarization light splitting element, is combined with the first excited light at the first light combining element along a second light path, and is emitted into the light homogenizing element for homogenizing after being combined.

The first light source is not limited, and may be any one of a blue light source, a red light source, and a green light source. For example, the blue light source may be a laser light source (B-LD) capable of emitting a blue light beam, the red light source may be a laser light source (R-LD) capable of emitting a red light beam, and the green light source may be a laser light source (G-LD) capable of emitting a green light beam.

The polarization light splitting element can be plated with a polarization light splitting film, can transmit light with a P-state polarization state and reflect light with an S-state polarization state; light with the polarization state of P may be reflected, and light with the polarization state of S may be transmitted.

The excited light source can be excited by other light beams to emit excited light; for example, the first excited light source may be an LED (G-LED) that emits a green light beam when excited by the blue light beam.

The first light combining element can be a dichroic mirror or the like, and the light homogenizing element can be a fly eye or a fresnel lens or a micro-lens array or the like.

Optionally, a collimating element and at least one of a beam expanding element and a speckle reduction element are further disposed on the second optical path. The beam expanding element can be a lens assembly capable of changing the diameter and the divergence angle of the light beam emitted by the first light source. The collimating element may collimates and filters diffused light in the light beam emitted by the first light source to form normal collimated light or near collimated light. The speckle suppression element is a diffusion sheet or a diffusion wheel, if the suppression element is a diffusion sheet, the second suppression element is a diffusion wheel; the diffuser may be a microstructure; the diffusion sheet may contain scattering particles, and the scattering particles may include one or more of Al2O3, tiO2, alN, mgO, BN, znO, zrO2, baSO4, polycarbonate, polyethylene terephthalate, polyvinyl chloride, polyurethane, and methyl methacrylate.

Optionally, a speckle suppression element and a collimation element are further disposed on the first optical path. It should be noted that a mirror, a focusing lens, a collimating lens, and the like for changing the optical path direction may be provided on the first optical path and the second optical path as necessary.

Optionally, the light source device further includes a target light source, a second light combining element, and a focusing collimating element, where a light beam emitted from the target light source is combined with the excited light at the second light combining element, and the combined light passes through the focusing collimating element and enters the first light combining element. The target light source is not limited, and may be, for example, an LED light source such as an LED (R-LED) emitting a red light beam, and an LED (B-LED) emitting a blue light beam. The second light combination element can reflect light beams of one color and transmit light beams of other colors; for example, a green light beam may be reflected and blue and red light beams may be transmitted.

In some embodiments, the tunable element includes a target region and a polarization conversion region; for example, the target area may be a diffuser or a transmissive area, the polarization converting area may be a phase element, and the like. The first state is that the polarization conversion area is positioned on the first light path and is used for converting the polarization state of the light beam emitted by the first light source; the second state is that the target area is positioned on the second light path and used for carrying out speckle suppression on the light beam emitted by the first light source or transmitting the light beam emitted by the first light source. The adjustable element can be a rotatable element, and when the adjustable element is required to be in a first state, the polarization conversion area is adjusted to be located on the first light path; when the adjustable element is required to be in the second state, the target area is adjusted to be positioned on the second light path. For example, fig. 1 is a schematic diagram of an adjustable element provided in the present application; as shown in fig. 1, the tunable element may be composed of a phase element and a diffusion sheet.

For example, fig. 2 is a schematic diagram of a light source device provided in the present application. As shown in fig. 2, the light source device includes a first light source (B-LD), an adjustable element 31 (the adjustable element 31 includes a target region and a polarization conversion region), a polarization splitting element 32, a first excited light source (G-LED), a first light combining element 7, and a light uniformizing element 8; and a beam expanding element 33, a collimating element 34, and a speckle reduction element 35 disposed on the second optical path. And a reflecting mirror 41, a speckle suppressing element 42, a collimating element 43, a second light combining element 5, focusing collimating lenses 22 and 21, and a focusing lens 6, which are disposed on the first optical path. The light source arrangement further comprises a target light source (R-LED) and corresponding focusing collimator lenses 11 and 12.

When the tunable element 31 is in the first state, assuming that the polarization state of the blue light beam emitted by the B-LD is in the P state, the polarization state is converted into the S state after passing through the polarization conversion region of the tunable element 31, the polarization beam splitter 32 reflects the blue light beam, and then the blue light beam is reflected by the reflector 41, passes through the speckle suppressing element 42, the collimating element 43, the second light combiner 5, and the focusing collimating lenses 22 and 21, and then enters the G-LED. The G-LED is excited to emit a green light beam, which is reflected by the second light combining element 5 after passing through the focusing collimating lenses 22 and 21, and enters the first light combining element 7 and the dodging element 8 after passing through the focusing lens 6. The red light beam emitted from the R-LED is combined with the green light beam at the second light combining element 5 through the focusing collimating lenses 11 and 12, and the second light combining element 5 reflects the green light beam and transmits the red and blue light beams.

When the tunable element 31 is in the second state, the blue light beam emitted by the B-LD passes through the target region of the tunable element 31 to perform speckle suppression, and after the speckle suppression, the blue light beam passes through the polarization beam splitter 32, and then enters the first beam combiner 7 and the light uniformizer 8 through the beam expander 33, the collimator 34 and the speckle suppression element 35.

In some embodiments, the adjustable element is a phase element, and may be an element coated with a phase retardation film, a half-wave plate, or the like. The first state is that the adjustable element is positioned on the first light path and is used for converting the polarization state of the light beam emitted by the first light source; the second state is that the tunable element is not located on the second optical path. FIG. 3 is a schematic view of another adjustable element provided herein; as shown in the left diagram of fig. 3, the adjustable element may be left-right switched with respect to the first light source; as shown in the right diagram of fig. 3, the switching may be performed up and down with respect to the first light source.

Optionally, a collimating element and at least two of the first speckle suppression element, the beam expanding element and the second speckle suppression element are further disposed on the second optical path. For example, a diffusion sheet, a beam expander, a collimating lens, and a diffusion wheel are further disposed on the second light path. The two speckle suppression elements are used for performing speckle suppression on the light beams emitted by the light sources or transmitting the light beams emitted by the first light source, so that the display effect can be improved.

For example, fig. 4 is a schematic view of another light source device provided in the present application. Compared with the light source device shown in fig. 2, the adjustable element 31 in the present embodiment is an element that can be switched left and right or up and down. And a first speckle reduction element 33, a beam expanding element 34, a collimating element 35, and a second speckle reduction element 36 are disposed on the second optical path. When the tunable element 31 is in the first state, the blue light beam emitted from the B-LD is converted into the S state by the polarization state of the tunable element 31, and is reflected by the polarization beam splitter element 32 to enter the first optical path. When the tunable element 31 is in the second state, the blue light beam emitted from the B-LD directly enters the polarization beam splitter 32, is transmitted by the polarization beam splitter 32, and then passes through the first speckle reduction element 33, the beam expander 34, the collimator 35, and the speckle reduction element 36.

Optionally, the light source device further includes a second light source, and an optical path of a light beam emitted by the second light source is overlapped with the second optical path after passing through the polarization beam splitter. The second light source is not limited and may be, for example, an LED light source. Specifically, when the optical axis of the second light source is parallel to the optical axis of the first light source, and the second light source emits a light beam, the adjustable element is not located on the light path, or the target area of the adjustable element is located on the light path, and the light beam emitted by the second light source directly enters the polarization beam splitting element or enters the polarization beam splitting element through the target area. When the optical axis of the second light source is perpendicular to the optical axis of the first light source, the polarization beam splitting element reflects or transmits the light beam emitted by the second light source.

For example, fig. 5 is a schematic view of another light source device provided in the present application. In comparison with the light source device shown in fig. 2, in which the second light source (R-LD) is added, the polarization splitting element 32 may be coated with a film that transmits the red and blue light beams. The optical path of the red light beam emitted by the R-LD is superposed with the second optical path after passing through the polarization beam splitting element. When the B-LD emits a blue light beam, the corresponding description of fig. 2 may be referred to. When the R-LD emits the red light beam, the target area of the tunable element 31 is located on the optical path, and the red light beam enters the polarization beam splitter 32 after passing through the target area.

For example, fig. 6 is a schematic diagram of another light source device provided in the present application. In comparison with the light source device shown in fig. 4, a second light source (R-LD) is added, and the polarization beam splitter 32 may be plated with a film that reflects the red light beam and transmits the blue light beam. The red light beam emitted from the R-LD is reflected by the polarization beam splitter 32, and then passes through the first speckle reduction element 33, the beam expander 34, the collimator 35, and the second speckle reduction element 36. By increasing the R-LD, the red field brightness is increased.

In some embodiments, the tunable element is a polarization modulating element; the first state represents that the working voltage of the polarization regulating element is a first voltage, and the polarization state of the light beam passing through the polarization regulating element in the first state is a first polarization state; the second state indicates that the working voltage of the polarization control element is the second voltage, the polarization state of the light beam passing through the polarization control element in the second state is the second polarization state, and the polarization directions of the light beam in the first polarization state and the light beam in the second polarization state are orthogonal. The first voltage and the second voltage can be set in a user-defined mode according to practical application conditions. The first polarization state and the second polarization state are not limited, for example, the first polarization state may be a P state, the second polarization state may be an S state, or the second polarization state may be a P state, and the first polarization state is an S state. The polarization control element may be an electrically controlled liquid crystal panel in which liquid crystals are deflected upon voltage conversion so that the polarization state of the light beam can be switched.

In some embodiments, a second excited light source is disposed on the second light path, the light beam emitted from the first light source enters the second excited light source, the second excited light source is excited by the light beam emitted from the first light source to generate second excited light, and the second excited light and the first excited light are combined at the first light combining element. For example, the second excited light source may be an LED (R-LED) that emits a red light beam when excited by the blue light beam.

The light source device provided by the application comprises a first light source, an adjustable element, a polarization light splitting element, a first excited light source, a first light combining element and a light homogenizing element; when the adjustable element is in a first state, a light beam emitted by the first light source enters the first excited light source along a first light path through the polarization beam splitting element, and the first excited light source is excited by the light beam emitted by the first light source to generate first excited light; when the adjustable element is in a second state, the light beam emitted by the first light source passes through the polarization light splitting element, is combined with the first excited light at the first light combining element along a second light path, and is emitted into the light homogenizing element for homogenizing after light combination. The light source device obtains stimulated light by introducing the light source and deexcitation of the light source, can take advantages of various light sources into consideration, and can balance comprehensive optical properties such as brightness, color gamut, cost, picture effect and the like to a certain extent.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A light source device is characterized by comprising a first light source, an adjustable element, a polarization beam splitting element, a first excited light source, a first light combining element and a light homogenizing element;

when the adjustable element is in a first state, a light beam emitted by the first light source enters the first excited light source along a first light path through the polarization beam splitting element, and the first excited light source is excited by the light beam emitted by the first light source to generate first excited light;

when the adjustable element is in a second state, the light beam emitted by the first light source passes through the polarization light splitting element, is combined with the first stimulated luminescence at the first light combining element along a second light path, and is emitted into the light homogenizing element for homogenizing after light combination.

2. A light source device according to claim 1, wherein said tunable element comprises a target region and a polarization conversion region;

the first state is that the polarization conversion area is positioned on the first light path and is used for converting the polarization state of the light beam emitted by the first light source;

the second state is that the target area is located on the second light path, and the target area is used for performing speckle suppression on the light beam emitted by the first light source or transmitting the light beam emitted by the first light source.

3. A light source device according to claim 2, wherein a collimating element and at least one of a beam expanding element and a speckle reduction element are further disposed on the second optical path.

4. The light source device according to claim 1, wherein the first state is that the tunable element is located on the first optical path, and the tunable element is configured to convert a polarization state of the light beam emitted by the first light source;

the second state is that the tunable element is not located on the second optical path.

5. The light source device according to claim 4, wherein a collimating element and at least two of the first speckle reduction element, the beam expanding element and the second speckle reduction element are further disposed on the second optical path.

6. A light source device according to any one of claims 1-5, further comprising a second light source, wherein the path of the light beam emitted from the second light source is coincident with the second light path after passing through the polarization beam splitting element.

7. A light source device according to any one of claims 1 to 5, wherein a speckle reduction element and a collimating element are further disposed on the first optical path.

8. The light source device according to any one of claims 1 to 5, further comprising a target light source, a second light combining element and a focusing collimating element, wherein the light beam emitted from the target light source is combined with the excited light at the second light combining element, and the combined light passes through the focusing collimating element and enters the first light combining element.

9. A light source device according to claim 1, wherein the adjustable element is a polarization control element;

the first state represents that the working voltage of the polarization regulating and controlling element is a first voltage, and the polarization state of the light beam passing through the polarization regulating and controlling element in the first state is a first polarization state;

the second state indicates that the working voltage of the polarization regulating element is a second voltage, the polarization state of the light beam passing through the polarization regulating element in the second state is a second polarization state, and the polarization directions of the light beam in the first polarization state and the light beam in the second polarization state are orthogonal.

10. A light source device according to claim 1, wherein a second excited light source is disposed on the second light path, the light beam emitted from the first light source enters the second excited light source, the second excited light source is excited by the light beam emitted from the first light source to generate a second excited light, and the second excited light and the first excited light are combined at the first light combining element.

Images