CN114613252A - Optical system and display device - Google Patents
Optical system and display device Download PDFInfo
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- CN114613252A CN114613252A CN202011426860.3A CN202011426860A CN114613252A CN 114613252 A CN114613252 A CN 114613252A CN 202011426860 A CN202011426860 A CN 202011426860A CN 114613252 A CN114613252 A CN 114613252A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 323
- 239000000463 material Substances 0.000 claims abstract description 131
- 238000006243 chemical reaction Methods 0.000 claims abstract description 127
- 230000001902 propagating effect Effects 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 7
- 230000005284 excitation Effects 0.000 claims description 127
- 239000003086 colorant Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims 3
- 230000009471 action Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 19
- CNQCVBJFEGMYDW-UHFFFAOYSA-N lawrencium atom Chemical compound [Lr] CNQCVBJFEGMYDW-UHFFFAOYSA-N 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 239000012788 optical film Substances 0.000 description 3
- 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
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- 230000009467 reduction Effects 0.000 description 1
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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
Abstract
The invention discloses an optical system, wherein a wavelength conversion material can generate excited light under the irradiation of the excited light, a first optical element guides the excited light to be incident on the wavelength conversion material and guides the excited light to be separated from the excited light and emitted as emergent light, wherein at least one of a propagation path of the excited light incident on the wavelength conversion material and a propagation path of the excited light propagating towards the incident side of the excited light comprises a total reflection propagation process through the guiding action of the first optical element. The optical system of the invention separates the excited light and the exciting light generated by the wavelength conversion material by utilizing total reflection, has small energy loss of the total reflection to the light, and can improve the light utilization rate of the optical system and the brightness of the output light. The invention also discloses a display device.
Description
Technical Field
The present invention relates to the field of optical systems, and in particular, to an optical system. The invention also relates to a display device.
Background
The application of display devices in various fields is becoming more and more extensive, wherein the brightness index is one of the important indexes of display devices, and in order to make the display devices have better display performance, the technical subject of continuous search and continuous improvement of brightness is the technical subject of people skilled in the art.
Disclosure of Invention
The invention aims to provide an optical system which can improve the brightness of output light. The invention also provides a display device.
In order to achieve the purpose, the invention provides the following technical scheme:
an optical system includes 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 incident side of the excitation light 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 enters the wavelength conversion material, and the excited light propagating toward the side where the excitation light enters is emitted by total reflection through the optical surface of the first optical element;
alternatively, the first optical element includes an optical surface, the excitation light is totally reflected by the optical surface of the first optical element and enters the wavelength conversion material, and the excited light propagating toward the side where the excitation light enters is transmitted through the optical surface of the first optical element and emitted.
Preferably, the optical device further includes a second optical element for compensating an optical path length 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 length for the excited light to be transmitted through the optical surface 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 in a direction away from the wavelength conversion material and enters the second optical surface, and a second optical surface for reflecting the excitation light so that the excitation light enters the wavelength conversion material, and the excited light propagating toward the side where the excitation light enters is transmitted through the first optical element and emitted.
Preferably, the first optical element includes a first optical surface for totally reflecting the excitation light so that the excitation light propagates in a direction away from the wavelength conversion material and enters the second optical surface, a second optical surface for reflecting the excitation light so that the excitation light enters the wavelength conversion material, and a third optical surface for totally reflecting the excited light propagating toward the side where the excitation light enters so that the part of the excited light is separated from the excitation light and 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 away from the first optical element.
Preferably, the wavelength conversion material is specifically used for generating at least excited light respectively propagating towards two sides of the wavelength conversion material under the irradiation of the excited light;
the wavelength conversion device 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 the exciting light and reflecting the excited light generated by the wavelength conversion material and emitted towards the 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 away from the first optical element.
Preferably, the second excitation light enters from the third optical element side, transmits through the third optical element, and irradiates 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 three primary colors of light.
In view of the above technical solutions, the present invention provides an optical system, wherein a wavelength conversion material can generate excited light under 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 as emergent 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 a guiding function of the first optical element. The optical system of the invention separates the excited light and the exciting light generated by the wavelength conversion material by utilizing total reflection, and the total reflection has small energy loss of the light, thereby improving the light utilization rate of the optical system and improving the brightness of the output light.
The display device provided by the invention can achieve the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
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 yet another embodiment of the present invention;
FIG. 4 is a schematic diagram of an optical system according to yet another embodiment of the present invention;
FIG. 5 is a schematic diagram of an optical system according to yet another embodiment of the present invention;
FIG. 6 is a schematic diagram of an optical system according to yet another embodiment of the present invention;
FIG. 7 is a schematic diagram of an optical system according to yet another embodiment of the present invention;
FIG. 8 is a schematic diagram of an optical system according to yet another embodiment of the present invention;
fig. 9 is a schematic diagram of an optical system according to still another embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides an optical system, which comprises a wavelength conversion material and a first optical element, wherein the wavelength conversion material is used for generating excited light under the irradiation of the exciting light, the first optical element is used for guiding the exciting light to be incident to the wavelength conversion material and guiding the excited light to be separated from the exciting light and emitted, and at least one of a propagation path of the exciting light incident to the wavelength conversion material and a propagation path of the excited light propagating towards the incident side of the exciting light comprises a total reflection propagation process.
The wavelength conversion material is a material which can emit light with preset wavelength under the irradiation of exciting light. The wavelength conversion material is preferably distributed in a layered manner, so that the situation that the light generated by the material is excited transversely propagates in the material to cause the reduction of the luminous power density can be reduced, and the light can be more easily transmitted through the wavelength conversion material.
The excited light is separated from the exciting light by the guiding function of the first optical element to form emergent light, wherein at least one of a propagation path of the exciting light incident on the wavelength conversion material and a propagation path of the excited light propagating towards the incident side of the exciting light comprises a total reflection propagation process. Therefore, the optical system of the present embodiment separates the excited light and the excitation light generated by the wavelength conversion material by total reflection, and the total reflection has a small loss of light energy, so that the light utilization rate of the optical system can be improved, and the brightness of the output light can be improved.
Referring to fig. 1, fig. 1 is a schematic diagram of an optical system according to an embodiment, and it can be seen that the optical system includes a wavelength conversion material 100 and a first optical element 101. The wavelength conversion material 100 is used for generating excited light under irradiation of the excited light, and the wavelength conversion material 100 may be, 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 the excited light 2 under 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, 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 excited light 2 is totally reflected through the optical surface 102 of the first optical element and emitted, so that the excited 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 this embodiment, the wavelength conversion material 100 generates the 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, the excitation light 1 is totally reflected by the optical surface 102 of the first optical element 101 and enters the wavelength conversion material 100, and the excited light 2 propagating to the side where the excitation light enters is transmitted by the optical surface 102 of the first optical element and emitted, so that the excited light 2 is separated from the excitation light 1, and the emitted light is formed.
The total reflection of the light ray requires that the light enters the lower refractive index optical medium from the higher refractive index optical medium and the incident angle is larger than the critical angle, so in practical applications, the structure of the first optical element and the refractive index of the optical medium body can be designed according to the wavelength range of the excitation light or the excited light generated by exciting the wavelength conversion material. Alternatively, an optical medium having a refractive index greater than that of air and air may be used to form an optical surface capable of total reflection of light, such as the optical system shown in fig. 1 or fig. 2, and the optical surface 102 capable of total reflection of light is formed by using the optical medium and air. 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 applications, the first optical element may adopt other optical structures based on the same principle, and the present invention is within the protection scope of the present invention.
Optionally, the optical system may further include a second optical element for compensating an optical path length for the excitation light to be transmitted through the optical surface of the first optical element, or a second optical element for compensating an optical path length 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 an excitation light 1 is incident into a first optical element 101 through a second optical element 103, and then is transmitted through an optical surface 102 of the first optical element 101 to irradiate a wavelength conversion material 100. The optical path length of the excitation light 1 is compensated by the second optical element 103, and the light emission direction can be changed by the second optical element 103, and the incident angle of the light irradiated 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 made the same as the original propagation direction. The flexibility of the optical path design is increased by arranging the second optical element 103, which facilitates the arrangement of the elements of the optical system in practical applications.
Optionally, referring to fig. 4, 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 an 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 out through the second optical element 104, the optical path of the excited light 2 is compensated by the second optical element 104, the light emitting 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 light path design is increased by arranging the second optical element 104, and the arrangement of each element of the optical system is convenient in practical application.
The shape of the first optical element, the shape of the second optical element, and the structural arrangement of the first optical element and the second optical element shown in fig. 3 or fig. 4 are only a specific example of the optical system of the present invention, and other optical structures based on the same principle can be adopted for the first optical element and the second optical element in practical applications according to practical application requirements, and are also within the protection scope of the present invention. Alternatively, the first optical element or the second optical element may be an optical medium body having a certain refractive index, and the refractive index of the first optical element and the refractive index of 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 according to yet another embodiment, as can be seen from the figure, a first optical element 101 of the optical system includes a first optical surface 105 and a second optical surface 106, 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 total reflection of the excitation light 1, 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 reflection of the excitation light 1, so that the excitation light 1 is 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, so that the excited light 2 is separated from the excitation light 1 by the first optical element 101.
In practical applications, the first optical surface and the second optical surface can be designed and formed by using an optical medium body with a certain refractive index according to the wavelength range of the excitation light 1 and the incident direction of the excitation light 1, so as to meet the requirements of practical applications.
Optionally, referring to fig. 6, fig. 6 is a schematic diagram of an optical system according to another embodiment, wherein 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 configured to totally reflect the excitation light 1 such 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 configured to reflect the excitation light 1 such that the excitation light 1 is incident on the wavelength conversion material 100. 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 used for totally reflecting the excited light 2 propagating toward the incident side of the excitation light 1, so that the part of the excited light is separated from the excitation light 1 and emitted.
In practical application, the first optical surface, the second optical surface and the third optical surface can be designed and formed by adopting an optical medium body with a certain refractive index according to the waveband range of the exciting light 1, the incident direction of the exciting light 1 and the emergent light direction so as to meet the requirement of practical application. Alternatively, a plurality of independent optical medium bodies may be used to design and form the first optical surface, the second optical surface, and the third optical surface, for example, two optical medium bodies 108 and two optical medium bodies 109 with certain refractive indexes are used as shown in fig. 6, where the incident angle of light irradiated to the wavelength conversion material 100 may be changed through the optical medium bodies 108, and the emitting direction of the excited light 2 may be adjusted through the optical medium bodies 109, so as to increase the flexibility of the light path design. Alternatively, the second optical surface may be formed by plating an optical film to form the reflective surface.
In particular 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 one surface of the prism 109 and 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 applications, the refractive indexes of the respective optical medium bodies used in the first optical element may be selected according to the wavelength ranges of the excitation light and the excited light, and the structure of the optical medium bodies may be 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 protection scope of the present invention.
Therefore, the optical system of the present embodiment separates the excited light and the excitation light generated by the wavelength conversion material by total reflection, and the total reflection has small energy loss to light, so that the light utilization rate of the optical system can be improved, and the brightness of the 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 is improved.
Further preferably, in each of the above embodiments, the wavelength conversion material may be irradiated with multiple excitation lights incident from different directions, so that the wavelength conversion material generates excited light. Referring to fig. 7 by way of example, fig. 7 is a schematic diagram of an optical system according to yet another embodiment, in which a first excitation light 1 is irradiated to a wavelength conversion material 100 from a side where a first optical element 101 is located, and a second excitation light 4 is irradiated to 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 lights with the same wavelength range, 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 use a narrow-band light beam.
Therefore, the optical system of the present embodiment can irradiate the wavelength conversion material with multiple paths of excitation light incident from different directions, and excite the wavelength conversion material to generate excited light, thereby further improving the light conversion efficiency of the wavelength conversion material, enabling the wavelength conversion material to generate more light, and improving 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 the excited light that propagates toward both sides of the wavelength conversion material 100 respectively under irradiation of the excitation light, and specifically the optical system further includes a third optical element, the first optical element and the third optical element are respectively disposed on both sides of the wavelength conversion material, and the third optical element is configured to transmit the excitation light and reflect the excited light generated by the wavelength conversion material and emitted toward the present side. In this way, the light propagating toward the first optical element side includes the excited light generated by the wavelength conversion material and originally propagating toward the first optical element side, and the light generated by the wavelength conversion material, reflected by the second optical element and transmitted through the wavelength conversion material, so that the optical system utilizes the excited light emitted by the wavelength conversion material and respectively propagating toward both sides, guides and emits both the parts of light to be output light, improves the light utilization rate, and can improve the brightness of the output light.
Referring to fig. 8, fig. 8 is a schematic diagram of an optical system according to yet another embodiment, and as can be seen from the diagram, the optical system includes a wavelength conversion material 100, a first optical element 101, and a third optical element 110, the wavelength conversion material 100 can generate at least excited light 2 and excited light 3 respectively propagating toward two sides of the wavelength conversion material 100 under the irradiation of excitation light 1, the excited light 2 propagates toward a side where the first optical element 101 is located, and the excited light 3 propagates toward a side where the third optical element 110 is located. The third optical element 110 reflects the excited light 3 propagating toward the present side back to the wavelength conversion material 100, and transmits the light through the wavelength conversion material 100 to propagate toward the other side, i.e., the side where the first optical element 101 is located. The first optical element 101 separates the excited light beams 2 and 3 propagating to the present side from the excitation light beam 1 and emits them. In the optical system shown in fig. 8, the excitation light 1 is transmitted through the optical surface 102 of the first optical element 101 and enters the wavelength conversion material 100, and the excited light 2 and 3 is totally reflected through the optical surface 102 of the first optical element 101 and emitted, so that the excited light 2 and 3 is separated from the excitation light 1.
In the present embodiment, the wavelength conversion materials 100 are distributed in layers, and by controlling the thickness of the wavelength conversion materials 100, the excited light 3 can be made to easily transmit through the wavelength conversion materials 100. Further preferably, an optical film for antireflection of the excited light 3 may be provided on the side of the wavelength conversion material 100 close to the third optical element 110 to reduce light energy loss.
Further preferably, in the optical system, the wavelength conversion material is irradiated with multiple excitation lights incident from different directions, so that the wavelength conversion material generates excited light. Referring to fig. 9, fig. 9 is a schematic diagram of an optical system according to yet another embodiment, in which, based on the above embodiment, the first excitation light 1 is irradiated to the wavelength conversion material 100 from a side where the first optical element 100 is located, and the second excitation light 4 is irradiated to the wavelength conversion material 100 from a side of the wavelength conversion material 100 away from the first optical element 101. The wavelength conversion material 100 generates the 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 conversion material 100, so that the light is transmitted through the wavelength conversion material 100 and propagates toward the other side, i.e., the side where the first optical element 101 is located. The first optical element 101 separates the excited light beams 2 and 3 propagating to the present side from the excitation light beam 1 and emits them.
In the optical system shown in fig. 9, the excitation light 1 is transmitted through the optical surface 102 of the first optical element 101 and enters the wavelength conversion material 100, and the excited light 2 and 3 is totally reflected through the optical surface 102 of the first optical element 101 and emitted, so that the excited light 2 and 3 is separated from the excitation light 1. In other embodiments of the optical system, the separation of the excited light 2, 3 from the excitation light 1 can be achieved by applying the 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, and may be irradiated to the wavelength conversion material 100 by other methods or optical paths from the side where the third optical element 110 is located, and all of them are within the protection 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 generated second excitation light 4 directly irradiates the wavelength conversion material 100, so that light loss can be reduced, light utilization rate can be improved, output light brightness can be improved, and system volume can be reduced.
Correspondingly, the embodiment of the invention also provides a display device which comprises the optical system.
The display device of the embodiment adopts the optical system, the wavelength conversion material in the optical system can generate excited light under the irradiation of the excited light, the first optical element guides the excited light to be incident to the wavelength conversion material, and guides the excited light to be separated from the excited light and emitted as emergent light, wherein at least one of a propagation path of the excited light incident to the wavelength conversion material and a propagation path of the excited light propagating towards the incident side of the excited 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 excited light by using total reflection, and the total reflection has small light energy loss, so that the light utilization rate can be improved, the output light brightness can be improved, and the brightness of the display device can be improved.
In the display device of the present embodiment, display is realized by using three primary colors, and an optical system may be used to emit any one of the three primary colors.
The optical system and the display device provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (12)
1. An optical system comprising a wavelength conversion material for generating excited light upon irradiation with 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 a side on which the excitation light is incident includes a total reflection propagation process.
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 to the wavelength conversion material, and the excited light propagating toward the incident side of the excitation light is emitted by total reflection through the optical surface of the first optical element;
alternatively, the first optical element includes an optical surface, the excitation light is totally reflected by the optical surface of the first optical element and enters the wavelength conversion material, and the excited light propagating toward the side where the excitation light enters is transmitted through the optical surface of the first optical element and emitted.
3. The optical system according to claim 2, further comprising a second optical element for compensating an optical path length for the excitation light to be transmitted through the optical surface of the first optical element, or for compensating an optical path length for the excited light to be transmitted through the optical surface of the first optical element.
4. The optical system according to claim 1, wherein the first optical element includes a first optical surface for totally reflecting the excitation light so that the excitation light propagates in a direction away from the wavelength conversion material and is incident on 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 a side where the excitation light is incident is transmitted through the first optical element and emitted.
5. The optical system according to claim 1, wherein the first optical element includes a first optical surface for totally reflecting the excitation light so that the excitation light propagates in a direction 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 an incident side of the excitation light so that the part of the excited light is separated from the excitation light and emitted.
6. An optical system according to any one of claims 1 to 5, wherein first excitation light is irradiated to the wavelength converting material from a side of the wavelength converting material remote from 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 any one of claims 1 to 5, characterized in that the wavelength conversion material is specifically configured to generate at least excited light propagating towards both sides of the wavelength conversion material, respectively, under irradiation of the excitation light;
the wavelength conversion device 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 the exciting light and reflecting the excited light generated by the wavelength conversion material and emitted towards the side.
8. The optical system according to claim 7, wherein first excitation light is irradiated to the wavelength conversion material from a side where the first optical element is located, and second excitation light is irradiated to the wavelength conversion material from a side of the wavelength conversion material away from the first optical element.
9. The optical system according to claim 8, wherein second excitation light is incident from the third optical element side, is transmitted through the third optical element, and is irradiated to the wavelength conversion material.
10. The optical system of claim 8, wherein 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.
11. A display device comprising an optical system according to any one of claims 1 to 10.
12. A display device as claimed in claim 11, characterized in that the optical system is arranged to emit light of any of the three primary colors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011426860.3A CN114613252B (en) | 2020-12-09 | 2020-12-09 | Optical system and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011426860.3A CN114613252B (en) | 2020-12-09 | 2020-12-09 | Optical system and display device |
Publications (2)
| Publication Number | Publication Date |
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| CN114613252A true CN114613252A (en) | 2022-06-10 |
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