CN114613252B - Optical system and display device - Google Patents
Optical system and display device Download PDFInfo
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- CN114613252B CN114613252B CN202011426860.3A CN202011426860A CN114613252B CN 114613252 B CN114613252 B CN 114613252B CN 202011426860 A CN202011426860 A CN 202011426860A CN 114613252 B CN114613252 B CN 114613252B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 325
- 230000005284 excitation Effects 0.000 claims abstract description 162
- 239000000463 material Substances 0.000 claims abstract description 129
- 238000006243 chemical reaction Methods 0.000 claims abstract description 112
- 230000001902 propagating effect Effects 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000003086 colorant Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 18
- CNQCVBJFEGMYDW-UHFFFAOYSA-N lawrencium atom Chemical compound [Lr] CNQCVBJFEGMYDW-UHFFFAOYSA-N 0.000 description 4
- 239000012788 optical film Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Multimedia (AREA)
- Optics & Photonics (AREA)
- Optical Filters (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses an optical system, wherein a wavelength conversion material can generate excited light under the irradiation of excitation light, a first optical element guides the excitation light to enter the wavelength conversion material and guides the excited light to be separated from the excitation light and emitted out as emergent light, and at least one of a propagation path of the excitation light entering the wavelength conversion material and a propagation path of the excited light propagating towards the incident side of the excitation light comprises a total reflection propagation process through the guiding action of the first optical element. The optical system separates the excited light generated by the wavelength conversion material from the excitation light by utilizing total reflection, has small loss of light energy by total reflection, and can improve the light utilization rate of the optical system and the brightness of output light. The invention also discloses a display device.
Description
Technical Field
The invention relates to the technical field of optical systems, in particular to an optical system. The invention also relates to a display device.
Background
Display devices are increasingly used in various fields, wherein brightness indexes are one of important indexes of the display devices, and in order to enable the display devices to have better display performance, brightness improvement is a technical subject which is continuously explored and improved by those skilled in the art.
Disclosure of Invention
The invention aims to provide an optical system capable of improving the brightness of output light. The invention further provides a display device.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an optical system comprising a wavelength conversion material for generating excited light under irradiation of excitation light, and a first optical element for guiding the excitation light to be incident on the wavelength conversion material and guiding the excited light to be emitted separately from the excitation light, wherein at least one of a propagation path of the excitation light to be incident on the wavelength conversion material and a propagation path of the excited light to propagate toward a side on which the excitation light is incident includes a total reflection propagation process.
Preferably, the first optical element includes an optical surface, the excitation light is transmitted through the optical surface of the first optical element and is incident on the wavelength conversion material, and the excited light propagating toward the excitation light incident side is emitted by total reflection through the optical surface of the first optical element;
alternatively, the first optical element may include an optical surface, and the excitation light is totally reflected by the optical surface of the first optical element and is incident on the wavelength conversion material, and the excited light propagating toward the excitation light incident side is transmitted by the optical surface of the first optical element and is emitted.
Preferably, the optical system further comprises a second optical element for compensating an optical path for excitation light to be transmitted through the optical face of the first optical element, or for compensating an optical path for excited light to be transmitted through the optical face of the first optical element.
Preferably, the first optical element includes a first optical surface for totally reflecting the excitation light so that the excitation light propagates away from the wavelength conversion material and is incident on the second optical surface, and a second optical surface for reflecting the excitation light so that the excitation light is incident on the wavelength conversion material, and the excited light propagating toward the excitation light incident side is transmitted through the first optical element and is emitted.
Preferably, the first optical element includes a first optical surface for totally reflecting the excitation light so that the excitation light propagates away from the wavelength conversion material and is incident on the second optical surface, a second optical surface for reflecting the excitation light so that the excitation light is incident on the wavelength conversion material, and a third optical surface for totally reflecting the excited light propagating toward the excitation light incidence side so that the part of the excited light is separated from the excitation light and is emitted.
Preferably, the first excitation light is irradiated to the wavelength conversion material from a side where the first optical element is located, and the second excitation light is irradiated to the wavelength conversion material from a side of the wavelength conversion material remote from the first optical element.
Preferably, the wavelength conversion material is specifically configured to generate at least excited light propagating towards two sides of the wavelength conversion material under irradiation of the excitation light;
the light source further comprises a third optical element, wherein the first optical element and the third optical element are respectively arranged on two sides of the wavelength conversion material, and the third optical element is used for transmitting excitation light and reflecting the excited light which is generated by the wavelength conversion material and is emitted towards the self side.
Preferably, the first excitation light is irradiated to the wavelength conversion material from a side where the first optical element is located, and the second excitation light is irradiated to the wavelength conversion material from a side of the wavelength conversion material remote from the first optical element.
Preferably, the second excitation light is incident from the third optical element side, transmitted through the third optical element, and then irradiated to the wavelength conversion material.
Preferably, the second excitation light is generated by a solid-state light source, the wavelength conversion material is attached to the solid-state light source, and the third optical element is formed by a reflective layer of the solid-state light source.
A display device comprising the optical system described above.
Preferably, the optical system is configured to emit any one of the primary colors of light.
As can be seen from the above-mentioned aspects, the present invention provides an optical system, wherein the wavelength conversion material is capable of generating excited light under irradiation of excitation light, the first optical element guides the excitation light to enter the wavelength conversion material, and guides the excited light to be emitted separately from the excitation light, and become outgoing light, wherein at least one of a propagation path of the excitation light entering the wavelength conversion material and a propagation path of the excited light propagating toward an incident side of the excitation light includes a total reflection propagation process by guiding action of the first optical element. The optical system separates the excited light generated by the wavelength conversion material from the excitation light by utilizing total reflection, and the total reflection has small loss on light energy, so that the light utilization rate of the optical system can be improved, and the brightness of output light can be improved.
The display device provided by the invention can achieve the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an optical system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an optical system according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of an optical system according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of an optical system according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of an optical system according to another embodiment of the present invention;
FIG. 6 is a schematic diagram of an optical system according to another embodiment of the present invention;
FIG. 7 is a schematic diagram of an optical system according to another embodiment of the present invention;
FIG. 8 is a schematic diagram of an optical system according to another embodiment of the present invention;
fig. 9 is a schematic diagram of an optical system according to another embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
An embodiment of the present invention provides an optical system including a wavelength conversion material for generating excited light under irradiation of excitation light, and a first optical element for guiding the excitation light to be incident on the wavelength conversion material and guiding the excited light to be emitted separately from the excitation light, wherein at least one of a propagation path of the excitation light incident on the wavelength conversion material and a propagation path of the excited light propagating toward an excitation light incident side includes a total reflection propagation process.
The wavelength conversion material is a material that emits light of a predetermined wavelength when irradiated with excitation light. The wavelength conversion material is preferably distributed in a layered form, so that on one hand, light generated by excitation of the material can be reduced from traveling laterally inside the material, and the light emission power density can be reduced, and on the other hand, the light can be easily transmitted through the wavelength conversion material.
The light is guided by the first optical element, and the excited light is separated from the excitation light and emitted to form emergent light, wherein at least one of a propagation path of the excitation light incident on the wavelength conversion material and a propagation path of the excited light propagating toward the excitation light incident side includes a total reflection propagation process. Therefore, the optical system of the embodiment separates the excited light generated by the wavelength conversion material from the excitation light by using total reflection, and the total reflection has small loss of light energy, so that the light utilization rate of the optical system can be improved, and the brightness of output light can be improved.
Referring to fig. 1, fig. 1 is a schematic diagram of an optical system according to an embodiment, and as can be seen from the figure, the optical system includes a wavelength conversion material 100 and a first optical element 101. The wavelength conversion material 100 is used to generate excited light under irradiation of the excited light, and the wavelength conversion material 100 may employ, but is not limited to, phosphor. In practical application, the wavelength band of the excited light generated by the wavelength conversion material can be selected according to practical application requirements.
In the optical system shown in fig. 1, the wavelength conversion material 100 generates excited light 2 under irradiation of excitation light 1, and the excited light 2 propagates toward the incident side of the excitation light 1. The first optical element 101 includes an optical surface 102, and the excitation light 1 is transmitted through the optical surface 102 of the first optical element and enters the wavelength conversion material 100, and the excitation light 2 is emitted by total reflection through the optical surface 102 of the first optical element, so that the excitation light 2 is separated from the excitation light 1.
Referring to fig. 2, fig. 2 is a schematic diagram of an optical system according to another embodiment, and it can be seen that in the present embodiment, the wavelength conversion material 100 generates excited light 2 under the irradiation of the excitation light 1, and the excited light 2 propagates toward the incident side of the excitation light 1. The first optical element 101 includes an optical surface 102, and the excitation light 1 is totally reflected by the optical surface 102 of the first optical element 101 and is incident on the wavelength conversion material 100, and the excited light 2 propagating toward the excitation light incidence side is transmitted by the optical surface 102 of the first optical element and is emitted, so that the excited light 2 is separated from the excitation light 1, and the emitted light is formed.
The total reflection of light requires that light enters the lower refractive index optical medium from the higher refractive index optical medium and that the incident angle is larger than the critical angle, so that in practical applications, the structure of the first optical element and the refractive index of the optical medium body used can be designed according to the wavelength range of the excitation light or the excited light generated by excitation of the wavelength converting material. Alternatively, an optical medium having a refractive index greater than that of air may be used with air to form an optical surface capable of total reflection of light, such as the optical system shown in fig. 1 or 2, and the optical medium and air may be used to form an optical surface 102 capable of total reflection of light. It should be noted that the optical structure adopted by the first optical element shown in fig. 1 or fig. 2 is only a specific example, and in practical application, other optical structures based on the same principle may be adopted by the first optical element, which are all within the scope of the present invention.
Optionally, the optical system may further include a second optical element for compensating an optical path for the excitation light to be transmitted through the optical surface of the first optical element, or the second optical element for compensating an optical path for the excited light to be transmitted through the optical surface of the first optical element. Referring to fig. 3, fig. 3 is a schematic diagram of an optical system according to another embodiment, in which excitation light 1 enters a first optical element 101 through a second optical element 103, and is transmitted through an optical surface 102 of the first optical element 101 to be irradiated to a wavelength conversion material 100. The optical path length of the excitation light 1 is compensated by the second optical element 103, and in addition, the light emission direction can be changed by the second optical element 103, so that the incident angle of the light to the wavelength conversion material 100 can be adjusted, for example, the propagation direction of the excitation light 1 after entering the first optical element 101 can be the same as the original propagation direction. The flexibility of the optical path design is increased by arranging the second optical element 103, facilitating the arrangement of the elements of the optical system in practical applications.
Referring to fig. 4 optionally, fig. 4 is a schematic diagram of an optical system according to another embodiment, which includes a first optical element 101 and a second optical element 104, wherein the excitation light 1 enters the first optical element 101 and enters the optical surface 102, and is totally reflected by the optical surface 102 and enters the wavelength conversion material 100. The excited light 2 generated by the wavelength conversion material 100 enters the first optical element 101 and enters the optical surface 102, is transmitted through the optical surface 102 and is emitted through the second optical element 104, the second optical element 104 compensates the optical path of the excited light 2, in addition, the light emission direction can be changed through the second optical element 104, the emitting direction of the excited light 2 can be adjusted, the flexibility of the optical path design is improved through arranging the second optical element 104, and the arrangement of all elements of the optical system is facilitated in practical application.
The first optical element shape, the second optical element shape and the structural arrangement of the two shown in fig. 3 or fig. 4 are only a specific example of the optical system of the present invention, and in practical application, other optical structures based on the same principle can be adopted for the first optical element and the second optical element according to practical application requirements, which are also within the scope of protection of the present invention. Alternatively, the first optical element or the second optical element may use an optical medium body having a refractive index, and the refractive indices of the first optical element and the second optical element may be the same or different.
Optionally, referring to fig. 5, fig. 5 is a schematic diagram of an optical system provided in another embodiment, and as can be seen from the fig. 5, a first optical element 101 of the optical system includes a first optical surface 105 and a second optical surface 106, where the excitation light 1 is incident on the first optical surface 105 of the first optical element 101, the first optical surface 105 is used to make the excitation light 1 totally reflected, so that the excitation light 1 propagates in a direction away from the wavelength conversion material 100 and is incident on the second optical surface 106, and the second optical surface 106 is used to reflect the excitation light 1 and make the excitation light 1 incident on the wavelength conversion material 100. The excited light 2 generated by the wavelength conversion material 100 and traveling toward the incident side of the excitation light 1 is transmitted through the first optical element 101 and emitted, whereby the excited light 2 is separated from the excitation light 1 by the first optical element 101.
In practical application, the first optical surface and the second optical surface can be designed and formed by adopting an optical medium body with a certain refractive index according to the wave band range of the excitation light 1 and the incident direction of the excitation light 1 so as to meet the practical application requirements.
Optionally, referring to fig. 6, fig. 6 is a schematic diagram of an optical system according to another embodiment, where a first optical element 101 of the optical system includes a first optical surface 105, a second optical surface 106, and a third optical surface 107. The excitation light 1 is incident on the first optical surface 105 of the first optical element 101, the first optical surface 105 is used for making the excitation light 1 totally reflected, so that the excitation light 1 propagates in a direction away from the wavelength conversion material 100 and is incident on the second optical surface 106, and the second optical surface 106 is used for reflecting the excitation light 1 and making the excitation light 1 incident on the wavelength conversion material 100. The excited light 2 generated by the wavelength conversion material 100 and propagating toward the incident side of the excitation light 1 is incident on the third optical surface 107, and the third optical surface 107 is configured to cause total reflection of the excited light 2 propagating toward the incident side of the excitation light 1, so that the excited light is separated from the excitation light 1 and emitted.
In practical application, the optical medium body with a certain refractive index can be designed and formed into the first optical surface, the second optical surface and the third optical surface according to the wave band range of the excitation light 1, the incident direction and the emergent light direction of the excitation light 1, so as to meet the practical application requirements. Alternatively, a plurality of optical media bodies that are independent may be used to design and form the first optical surface, the second optical surface, and the third optical surface, for example, two optical media bodies 108 and 109 each having a refractive index are used as shown in fig. 6, where the incident angle of light irradiated to the wavelength conversion material 100 may be changed by the optical media bodies 108, and the outgoing direction of the excited light 2 may be adjusted by the optical media bodies 109, so as to increase flexibility of the optical path design. Alternatively, the reflective surface may be formed by plating an optical film to form the second optical surface.
In implementations, the first optical surface 105, the second optical surface 106, and the third optical surface 107 may be formed by using prisms. For example, referring to fig. 6, with the prism 108 and the prism 109, the first optical surface 105 may be formed by an interface between one surface of the prism 108 and air, and the second optical surface 106 may be formed by plating an optical film on one surface of the prism 108. The third optical surface 107 may be formed by an interface of a surface of the prism 109 with air. The optical structure of the first optical element shown in fig. 6 is only a specific example of the optical system of the present invention, and in practical application, the refractive index of each optical medium body used by the first optical element can be selected according to the excitation light and the band range of the excited light, and the structure of the optical medium body designed according to the optical path arrangement, and other optical structures adopting the same principle as that shown in fig. 6 are also within the scope of the present invention.
Therefore, the optical system of the embodiment separates the excited light generated by the wavelength conversion material from the excitation light by using total reflection, and the total reflection has small loss of light energy, so that the light utilization rate of the optical system can be improved, and the brightness of output light can be improved. The optical system is applied to the display equipment, so that the light utilization rate of the display equipment can be improved, and the brightness can be improved.
Further preferably, in each of the above embodiments, the optical system may be configured such that a plurality of excitation lights incident from different directions are irradiated to the wavelength conversion material together, so that the wavelength conversion material generates the excited light. Referring to fig. 7 for an exemplary embodiment, fig. 7 is a schematic diagram of an optical system provided in a further embodiment, in which the first excitation light 1 irradiates the wavelength conversion material 100 from a side where the first optical element 101 is located, and the second excitation light 4 irradiates the wavelength conversion material 100 from a side of the wavelength conversion material 100 away from the first optical element 101, so that the wavelength conversion material 100 generates excited light under irradiation of the first excitation light 1 and the second excitation light 4. In practical applications, the first excitation light 1 and the second excitation light 4 may be two paths of light with identical wavelength ranges, or the wavelength ranges of the first excitation light 1 and the second excitation light 4 may be different. Preferably, the first excitation light 1 or the second excitation light 4 may employ a narrow band light beam.
Therefore, the optical system of the embodiment can irradiate the wavelength conversion material with multiple paths of excitation light incident from different directions, excite the wavelength conversion material to generate excited light, further improve the light conversion efficiency of the wavelength conversion material, enable the wavelength conversion material to generate more light, and improve the brightness of output light.
Further preferably, in each of the above embodiments, the wavelength conversion material 100 of the optical system may specifically generate at least excited light propagating toward both sides of the wavelength conversion material 100 under irradiation of excitation light, and specifically the optical system further includes third optical elements, the first optical element and the third optical element being disposed on both sides of the wavelength conversion material, respectively, the third optical element being configured to transmit the excitation light, and reflect the excited light generated by the wavelength conversion material and emitted toward the present side. Thus, the light traveling toward the first optical element side includes the excited light generated by the wavelength conversion material and originally traveling toward the first optical element side, and the light generated by the wavelength conversion material and transmitted through the wavelength conversion material after being reflected back by the second optical element side, and therefore, the present optical system utilizes the excited light emitted by the wavelength conversion material and traveling toward both sides, and guides and emits both of the light to output light, thereby improving the light utilization ratio and improving the output light brightness.
For example, referring to fig. 8, fig. 8 is a schematic diagram of an optical system provided in yet another embodiment, where the optical system includes a wavelength conversion material 100, a first optical element 101 and a third optical element 110, and the wavelength conversion material 100 is capable of generating at least excited light 2 and 3 propagating toward two sides of the wavelength conversion material 100 under irradiation of the excitation light 1, where the excited light 2 propagates toward one side of the first optical element 101, and the excited light 3 propagates toward one side of the third optical element 110. The third optical element 110 reflects the excited light 3 propagating towards the present side back towards the wavelength converting material 100, so that this light propagates towards the other side, i.e. the side where the first optical element 101 is located, after having transmitted through the wavelength converting material 100. The first optical element 101 emits the excited light 2 and 3 propagating toward the present side separately from the excitation light 1. In the optical system shown in fig. 8, excitation light 1 is transmitted through the optical surface 102 of the first optical element 101 to be incident on the wavelength conversion material 100, and excited light 2 and 3 are emitted by total reflection through the optical surface 102 of the first optical element 101 so that the excited light 2, 3 is separated from the excitation light 1.
The wavelength conversion material 100 is distributed in layers in this embodiment, and by controlling the thickness of the wavelength conversion material 100, the excited light 3 can be made to easily transmit through the wavelength conversion material 100. Further preferably, an optical film for anti-reflection of the excited light 3 may be provided on the side of the wavelength converting material 100 close to the third optical element 110 to reduce the light energy loss.
Further preferably, in the optical system, the wavelength conversion material may be irradiated with a plurality of excitation lights incident from different directions, so that the wavelength conversion material generates the excited light. Referring to fig. 9, fig. 9 is a schematic diagram of an optical system according to another embodiment, in which, based on the above embodiment, the first excitation light 1 irradiates the wavelength conversion material 100 from a side where the first optical element 100 is located, and the second excitation light 4 irradiates the wavelength conversion material 100 from a side of the wavelength conversion material 100 away from the first optical element 101. The wavelength converting material 100 generates excited light 2 and 3 under the irradiation of the first excitation light 1 and the second excitation light 4, and the third optical element 110 reflects the excited light 3 propagating toward the present side back to the wavelength converting material 100, so that the light propagates toward the other side, i.e., the side where the first optical element 101 is located after transmitting through the wavelength converting material 100. The first optical element 101 emits the excited light 2 and 3 propagating toward the present side separately from the excitation light 1.
In the optical system shown in fig. 9, excitation light 1 is transmitted through the optical surface 102 of the first optical element 101 to be incident on the wavelength conversion material 100, and excited light 2 and 3 are emitted by total reflection through the optical surface 102 of the first optical element 101 so that the excited light 2, 3 is separated from the excitation light 1. In other embodiments of the present optical system, the separation of the excited light 2, 3 from the excitation light 1 may be achieved in various ways of separating the excited light from the excitation light by the first optical element 101 provided in the above embodiments.
In addition, in the optical system shown in fig. 9, the second excitation light 4 is incident from the side of the third optical element 110, and is transmitted through the third optical element 110 to irradiate the wavelength conversion material 100, and in other embodiments, the second excitation light 4 is not limited to be incident to the wavelength conversion material 100 by being transmitted through the third optical element 110, but may be irradiated to the wavelength conversion material 100 from the side of the third optical element 110 by other means or an optical path, which is also within the scope of the present invention.
Further in a preferred embodiment, the second excitation light 4 may be generated by a solid-state light source, the wavelength conversion material 100 is attached to the solid-state light source, the third optical element is formed by a reflective layer of the solid-state light source, the solid-state light source is attached to the wavelength conversion material 100, and the second excitation light 4 generated by the solid-state light source directly irradiates the wavelength conversion material 100, so that light loss can be reduced, light utilization efficiency can be improved, output brightness can be improved, and system volume can be reduced.
Correspondingly, the embodiment of the invention also provides display equipment, which comprises the optical system.
The display device of this embodiment adopts the optical system described above, in which the wavelength conversion material is capable of generating excited light under irradiation of excitation light, the first optical element guides the excitation light to enter the wavelength conversion material, and guides the excited light to be separated from the excitation light and emitted out as outgoing light, wherein at least one of the propagation path of the excitation light entering the wavelength conversion material and the propagation path of the excited light propagating toward the excitation light incident side includes a total reflection propagation process, and the optical system separates the excited light generated by the wavelength conversion material from the excitation light by total reflection, and the total reflection has a small energy loss for light, thereby improving the light utilization ratio, improving the output luminance, and improving the brightness of the display device.
In the display device of this embodiment, display is realized by using three primary colors of light, and an optical system may be used for emitting any one of the three primary colors of light.
The above describes in detail an optical system and a display device provided by the present invention. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (10)
1. An optical system comprising a wavelength conversion material for generating excited light under irradiation of excitation light, and a first optical element for guiding the excitation light to be incident on the wavelength conversion material and guiding the excited light to be emitted separately from the excitation light, wherein at least one of a propagation path of the excitation light incident on the wavelength conversion material and a propagation path of the excited light propagating toward an excitation light incident side includes a total reflection propagation process;
the first optical element comprises a first optical surface and a second optical surface, the first optical surface is used for enabling excitation light to be subjected to total reflection, so that the excitation light propagates away from the wavelength conversion material and is incident on the second optical surface, the second optical surface is used for enabling the excitation light to be reflected and to be incident on the wavelength conversion material, and the excited light propagating towards the incidence side of the excitation light is transmitted through the first optical element and is emitted, wherein the first optical surface and the second optical surface are designed and formed by adopting a prism according to the wave band range of the excitation light and the incidence direction of the excitation light;
alternatively, the first optical element includes a first optical surface for totally reflecting the excitation light so that the excitation light propagates away from the wavelength conversion material and is incident on the second optical surface, a second optical surface for reflecting the excitation light so that the excitation light is incident on the wavelength conversion material, and a third optical surface for totally reflecting the excited light propagating toward the excitation light incidence side so that the part of the excited light is separated from the excitation light and is emitted, wherein the first optical surface and the second optical surface are designed and formed using prisms, and the third optical surface is designed and formed using prisms according to a wavelength range of the excitation light, an incidence direction of the excitation light, and an emission direction of the excitation light.
2. The optical system according to claim 1, wherein the first optical element includes an optical surface, the excitation light is transmitted through the optical surface of the first optical element to be incident on the wavelength conversion material, and the excited light traveling toward the excitation light incidence side is emitted by total reflection through the optical surface of the first optical element;
alternatively, the first optical element may include an optical surface, and the excitation light is totally reflected by the optical surface of the first optical element and is incident on the wavelength conversion material, and the excited light propagating toward the excitation light incident side is transmitted by the optical surface of the first optical element and is emitted.
3. The optical system of claim 2, further comprising a second optical element for compensating an optical path for excitation light to be transmitted through an optical face of the first optical element or for compensating an optical path for excited light to be transmitted through an optical face of the first optical element.
4. An optical system according to any one of claims 1-3, wherein a first excitation light is irradiated to the wavelength converting material from a side of the first optical element, and a second excitation light is irradiated to the wavelength converting material from a side of the wavelength converting material remote from the first optical element.
5. An optical system according to any one of claims 1-3, characterized in that the wavelength converting material is specifically adapted to generate at least excited light propagating towards both sides of the wavelength converting material under irradiation of excitation light;
the light source further comprises a third optical element, wherein the first optical element and the third optical element are respectively arranged on two sides of the wavelength conversion material, and the third optical element is used for transmitting excitation light and reflecting the excited light which is generated by the wavelength conversion material and is emitted towards the self side.
6. An optical system according to claim 5, wherein first excitation light is irradiated to the wavelength converting material from a side of the first optical element, and second excitation light is irradiated to the wavelength converting material from a side of the wavelength converting material remote from the first optical element.
7. The optical system according to claim 6, wherein the second excitation light is incident from the third optical element side, transmitted through the third optical element, and irradiated to the wavelength conversion material.
8. The optical system of claim 6, wherein the second excitation light is generated by a solid state light source, the wavelength conversion material is bonded to the solid state light source, and the third optical element is formed by a reflective layer of the solid state light source.
9. A display device comprising the optical system of any one of claims 1-8.
10. The display device according to claim 9, wherein the optical system is configured to emit any one of three primary colors of light.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011426860.3A CN114613252B (en) | 2020-12-09 | 2020-12-09 | Optical system and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011426860.3A CN114613252B (en) | 2020-12-09 | 2020-12-09 | Optical system and display device |
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