WO2018133325A1

WO2018133325A1 - Fluorescence chip and display system having same

Info

Publication number: WO2018133325A1
Application number: PCT/CN2017/089851
Authority: WO
Inventors: 胡飞; 郭祖强; 李屹
Original assignee: 深圳市绎立锐光科技开发有限公司
Priority date: 2017-01-17
Filing date: 2017-06-23
Publication date: 2018-07-26
Also published as: CN112596331A; CN108319096B; CN108319096A; CN112596331B

Abstract

Provided are a fluorescence chip (1) and a display system having the same. The fluorescence chip (1) comprises a plurality of fluorescence modules (10). The fluorescence modules (10) are arranged in an array. Each fluorescence module (10) comprises a substrate (101), a functional material (103) and a light collection structure (104). Recessed accommodation cavities (102) are arranged at respective same sides of the substrates (101) of the fluorescence modules (10). The accommodation cavity (102) has an opening (1021) allowing entrance of incoming light and emission of outgoing light. The functional material (103) is provided at the bottom of the accommodation cavity (102). The functional material (103) is a wavelength conversion material or a light scattering material. The light collection structure (104) of each fluorescence module (10) is provided inside the accommodation cavity (102) to converge incoming light entering the accommodation cavity (102) on the functional material (103), to emit, from the opening (1021), outgoing light generated after the functional material (103) has received the incoming light, and to control a divergence angle of the outgoing light within a preset range, thereby providing image light emitted in parallel.

Description

Fluorescent chip and display system thereof

Technical field

The present invention relates to the field of image display technologies, and in particular, to a fluorescent chip and a display system thereof.

Background technique

In the current display field, the display method mainly uses a DMD (Digital Micromirror Device) or an LCD (Liquid Crystal Display) as a light modulator to modulate the illumination light to obtain image light. However, DMD technology is in the hands of American companies. LCD technology is in the hands of Japanese companies, forming a technological monopoly. New companies enter the display field and cannot bypass the technology, which is not conducive to the reduction of display costs. In addition, display devices based on DMD or LCD technology have their own drawbacks in terms of efficiency.

Specifically, in a display device that uses a laser to excite a fluorescent material to generate polychromatic light as a light source, light emitted from the laser light emitting element reaches an optical material through an optical element (such as a light combining device or a beam shaping device), and is converted by the fluorescent material to obtain illumination light. The illumination light is coupled to the optical system; the optical system is modulated into image light; and finally the image light is projected onto the screen through the projection lens. In the above process, the light-emitting efficiency of the phosphor is about 90%, the efficiency coupled to the optomechanical system is about 94%, and the efficiency of the image light modulated by the optomechanical system is about 30% to 40%. It can be seen that in the above process, the efficiency of the optical machine is low, which seriously restricts the high brightness display.

Taking the 3DMD optomechanical system as an example, the illumination light first needs to form a spot suitable for the size and shape of the DMD, and then passes through the total reflection prism and the beam splitting prism to reach the DMD, and after modulation, passes through the beam splitting prism and the total reflection prism again into the projection lens. This loses a lot of light and limits the upper limit of high brightness display.

Taking a 3LCD optical system as an example, illumination light is irradiated onto the LCD to be modulated into image light, and then the Image light is imaged from the LCD position through the projection lens onto the screen. Due to the limitation of the projection lens, the area of the LCD should not be too large; at the same time, the necessary components such as wiring and electronic components of each pixel of the LCD limit the aperture ratio of the LCD. Therefore, the LCD used in the prior art is limited by the area and its own structure, and the LCD of a small area is inefficient, resulting in a large loss of light.

Summary of the invention

The technical problem to be solved by the present invention is to provide a fluorescent chip and a display system thereof, which are intended to provide parallel light that can be applied to display.

The present invention is achieved by a fluorescent chip comprising a plurality of fluorescent modules, each of the fluorescent modules being arranged in a matrix;

Each of the fluorescent modules includes a substrate, a functional material, and a light collecting structure;

The base of each of the fluorescent modules is formed with a concave-shaped receiving cavity on the same side, and the receiving cavity has an opening for incident light and emitted light;

The functional material is placed at the bottom of the accommodating cavity, and the functional material is a wavelength converting material or a scattering material, and the wavelength converting material is configured to receive incident light to generate a laser beam different from the wavelength of the incident light, the scattering material. For reflecting and scattering incident light and then emitting;

The light collecting structure of each of the fluorescent modules is disposed in the accommodating cavity, concentrating incident light incident into the accommodating cavity onto the functional material, and receiving the incident light after the functional material is received The generated emitted light is emitted from the opening, and the divergence angle of the emitted light is controlled within a preset range, so that each of the fluorescent modules constitutes a surface light source that emits approximately parallel light.

Further, the receiving cavity is an inverted trapezoidal shape, an inverted polygonal table shape or a rounded table shape.

Further, the light collecting structure is an optical lens placed at a position of the opening of the accommodating cavity, and the functional material is placed at a focus position of the optical lens.

Further, the inner surface of the accommodating cavity is in a parabolic shape, the light collecting structure is a reflective film placed on the paraboloid, and the functional material is placed at a focus position of the paraboloid.

Further, the fluorescent chip further includes a dimming device for reducing an exiting light angle, the adjusting A light device is placed at the opening of the receiving chamber.

Further, the dimming device is a lens or a light homogenizing rod.

Further, the substrate is a metal plate, a transparent silicon substrate or an aluminum nitride substrate.

Further, each of the four adjacent fluorescent modules constitutes one pixel, and at least one of the pixels has a fluorescent module that emits blue light, and at least one fluorescent module that emits red light, at least one of which emits green. A fluorescent module that emits light.

Further, the divergence angle of the outgoing light emerging from the opening ranges from 0 to 17 degrees.

Further, the radius of the receiving cavity opening is less than or equal to 0.2 times the height of the receiving cavity.

Further, the area at the opening is at least 25 times the area of the functional material filled at the bottom of the receiving chamber.

Further, the fluorescent chip further includes a plurality of filters, the number of the plurality of filters being consistent with the number of the plurality of fluorescent modules, the plurality of filters being respectively placed above the respective fluorescent modules and The opening of the receiving chamber is sealed.

Further, the filter is an angle selection filter capable of transmitting light of less than a preset angle and reflecting light of other angles.

The present invention also provides a display system comprising a light source, and the fluorescent chip according to any one of the above, the light source for emitting excitation light, the fluorescent chip receiving the excitation light and generating different wavelength ranges The laser is received and the laser is emitted in approximately parallel directions.

Further, the display system further includes a light modulator disposed on an outgoing light path of the light source for converting the excitation light into monochromatic image light and outputting to the fluorescent chip; The fluorescent chip receives the monochromatic image light and generates laser light of different wavelength ranges, and the laser light is emitted in approximately parallel directions.

Compared with the prior art, the present invention has the beneficial effects that each of the fluorescent modules in the fluorescent chip places the wavelength converting material at the bottom of the accommodating cavity, and the incident light is focused on the wavelength converting material through the light collecting structure, and at the same time, the light The collecting structure can also generate the laser light generated by the wavelength converting material from the opening of the receiving chamber Parallel exit, that is, the image light can be converted into parallel colored light after passing through the fluorescent chip, that is, the light source emitted from the fluorescent chip is a surface light source, so that the fluorescent chip can be applied to the display field.

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 description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and those skilled in the art can obtain other drawings according to these drawings without any creative work.

1 is a schematic structural view of a fluorescent chip according to an embodiment of the present invention;

2 is another schematic structural diagram of a fluorescent chip according to an embodiment of the present invention;

3 is a schematic structural diagram of still another fluorescent chip according to an embodiment of the present invention;

4 is a schematic structural diagram of still another fluorescent chip according to an embodiment of the present invention;

5 is a schematic diagram of a divergence angle formed by a laser exiting an opening in a single fluorescent module according to an embodiment of the present invention;

FIG. 6 is a schematic diagram showing the relationship between the height of the receiving cavity and the width of the opening in the fluorescent module according to the embodiment of the present invention.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention provides a fluorescent chip and a display system thereof, which are intended to improve the display technology in the current display field, and the main idea is that the fluorescent chip is composed of a plurality of fluorescent modules, and the fluorescent modules can be arranged in a one-dimensional matrix and two-dimensional. A matrix or a matrix of n×m, where n and m are both positive integers. The fluorescent chip can directly receive the modulated monochromatic image light and convert the monochromatic image light into color image light for image display. Each fluorescent module includes a substrate, a light collecting structure, and a functional material, and each fluorescent mode The base of the block is formed with a concave-shaped receiving cavity on the same side. The light collecting structure can guide the incident light onto the functional material, and guide the outgoing light generated by the functional material to be emitted, and the emitted light is parallelly emitted from the opening of the receiving cavity, so that the divergence angle of the light emitted by the fluorescent chip is as small as possible. That is to say, the light emitted from the fluorescent chip is a surface light source that is emitted in an approximately parallel direction, and does not need to collect the emitted light through the optical device, thereby reducing the light waste phenomenon in the light collecting process, and can be applied to the display with high efficiency.

In order to facilitate the understanding of the fluorescent module and the fluorescent chip, the optical path of the display system corresponding to the fluorescent chip will be briefly described. The monochromatic excitation light emitted by the light source passes through the light shaping system to form a uniform spot, and the spot is irradiated onto the light modulator, and modulated by the light modulator to form a monochromatic image light, and the monochromatic image light is imaged onto the fluorescent chip, thereby Get color image light. The light source may be an LD (Laser Diode) array. Preferably, the area of the fluorescent chip is larger than the area of the exit surface of the light modulator. According to the conservation of the optical spread amount, the light divergence angle of the image light incident on the fluorescent chip can be made smaller during the imaging process, thereby improving the utilization of light. rate.

As shown in FIG. 1, it is a schematic structural view of a fluorescent chip. The fluorescent chip 1 includes a plurality of fluorescent modules 10, and each of the fluorescent modules 10 is arranged in a matrix. The fluorescent module 10 includes a substrate 101, a functional material 103, and a light collecting structure 104. The base body 101 of each of the fluorescent modules 10 is formed with a concave-shaped receiving cavity 102 on the same side. The receiving cavity 102 has an opening 1021 for incident light entering and exiting light. The functional material 103 is placed at the bottom of the receiving cavity 102, and the functional material 103 is A wavelength converting material or a scattering material. The wavelength converting material is for generating at least a portion of the incident light to generate a laser that is different from the wavelength of the incident light, the incident light being the excitation light. The scattering material is used to reflect and scatter incident light and then exit.

The light collecting structure 104 of each of the fluorescent modules 10 is placed in the accommodating cavity 102, and the incident light incident into the accommodating cavity 102 is condensed onto the functional material 103, and the emitted light generated by the functional material 103 after receiving the incident light is emitted from the opening 1021. And controlling the divergence angle of the emitted light to be within a preset range, so that each of the fluorescent modules 10 constitutes a surface light source that emits approximately parallel light. Each of the fluorescent modules 10 constitutes a fluorescent chip, and the light exiting surface of each of the fluorescent modules 10 forms a plane, and the divergence angle is an angle formed by a straight line having the largest angle of the outgoing beam and a straight line perpendicular to the plane of the fluorescent chip. As shown in Fig. 5, the angle θ _{1 is} the divergence angle. The ideal state is that all the beams formed by the outgoing light are parallel beams, that is, the divergence angle of the beam is 0 degrees. Of course, as long as the outgoing direction of the beam is well controlled, it is permissible to control the divergence angle within a reasonable range. That is, the outgoing beam is similar to the parallel light. In order to cause the outgoing light to exit in parallel, the functional material 103 is placed near the focal position of the light collecting structure 104 such that the emitted laser light is parallel light under the illumination of any incident light. The parallel light is a surface-distributed light source and can be applied to display technology. Since the image light required for the display technology is a surface light source, the light directly emitted by the fluorescent chip is a surface light source, and can be directly used without adjustment of the optical element, thereby avoiding light loss during light conversion and improving light. Use efficiency.

In the above embodiment, the bases 101 of the respective fluorescent modules 10 are connected as a whole to facilitate the accumulation of the surface light sources emitted by the fluorescent chips in actual use. Preferably, the base body 101 can be integrally formed, that is, the base body 101 can be composed of a complete block material with better heat dissipation effect, for example, the base body 101 is a rectangular parallelepiped aluminum substrate, and a plurality of concave structures are arranged on one plane of the aluminum substrate. The adjacent concave structures are equally spaced apart, and the space formed by each concave structure is the receiving cavity 102. For example, the concave structure may be a groove, or a concave surface perpendicular to the horizontal plane may be trapezoidal, semi-circular, semi-elliptical, etc., that is, the inner space of the concave structure may have an inverted quadrangular shape and an inverted polygon. Table shape, hemisphere, semi-ellipsoid, etc. The functional material 103 is applied to the bottom of the receiving cavity 102, and the functional material 103 may be a wavelength converting material or a scattering material. That is, the functional material 103 disposed at the bottom of the accommodating cavity 102 of each fluorescent module 10 is different. For example, the bottom of the accommodating cavity 102 of the partial fluorescent module 10 is provided with a wavelength converting material that receives incident light to generate incident light. The laser light of different wavelengths is disposed at the bottom of the accommodating cavity 102 of the partial fluorescent module 10, and the scattering material reflects and scatters the incident light, thereby eliminating the coherence of the incident light.

There are several fluorescent modules 10, and each of the fluorescent modules 10 is arranged in a matrix. For example, each of the fluorescent modules 10 may be arranged in a one-dimensional array, a two-dimensional array, an n×m-dimensional array, or the like, wherein n and m are positive integers. For example, FIG. 1 shows a 1×n array, and only four fluorescent modules 10 are schematically illustrated as an example.

The incident light is excitation light, for example, it may be blue excitation light generated by a blue laser, or may be an LED light source. The light source generating the excitation light is placed above the opening 1021 of the accommodating cavity 102, After passing through the spatial light modulator, the light is directly incident into the accommodating cavity 102, and can be incident on the shortest path, thereby reducing the optical path and reducing the light loss. Of course, according to the actual structure of the product, the placement position of the light source and the type of the light source can also be adjusted. For example, the light source can be placed on the side of the substrate 101, and then the excitation light emitted by the light source can be guided into the accommodating cavity 102 through the optical device, such as The propagation direction of the excitation light is changed by the mirror so that the excitation light energy is incident into the accommodating cavity 102 from the opening 1021.

The accommodating cavity 102 may be one of an inverted trapezoidal shape, an inverted polygonal ridge shape, and a rounded table shape. The accommodating chamber 102 is mainly used for placing the functional material 103 and providing a accommodating space for the light collecting structure 104. In a specific application, the structure of the accommodating chamber 102 can also be improved.

The light collecting structure 104 is an optical lens, and may be, for example, a spherical transparent body or a convex lens, which is not required for the shape of the convex lens. The optical lens is placed at the open position of the accommodating cavity 102, and the functional material is placed at the focus position of the optical lens. Here, from the bottom of the accommodating chamber 102, the functional material, the optical lens, and the opening of the accommodating chamber are sequentially arranged. It can be understood that the opening position of the present invention also includes the technical solution of the plane of the opening passing through the optical lens. Of course, the light collecting structure 104 may be other structures as long as the incident excitation light is concentrated on the functional material 103 and the emitted light generated by the functional material 103 is emitted in parallel.

In combination with the above embodiments, the fluorescent chip may further include a filter 105 placed at the opening 1021 of the accommodating chamber 102. Specifically, the number of the filters is the same as the number of the fluorescent modules, and the respective filters are respectively disposed above the respective fluorescent modules and seal the openings of the receiving chambers. The filter 105 can not only filter the outgoing light emitted from the opening 1021, but also seal the opening 1021 of each of the accommodating cavities 102 in the fluorescent chip to form a space between the interior of the accommodating chamber 102 and the filter 105. A closed receiving space prevents dust, water vapor and the like from entering the internal space of the accommodating chamber 102. Alternatively, the filter 105 may be an angle selection filter that is capable of emitting light smaller than a specific angle, and light of other angles is reflected to reuse light of other angles that are not emitted. The angle selection filter can control the angle of the outgoing light so that the outgoing light of the fluorescent chip is controlled to exit in an appropriate direction and angle.

In the specific production, for example, a material with better heat dissipation effect can be selected as the fluorescent chip. The substrate is a rectangular parallelepiped, a cube or a prismatic body, and the surface of the substrate is divided into a plurality of blocks on average, and the blocks are arranged in a matrix. The accommodating cavity is digged on the same surface of each of the fluorescent modules on the same surface of the substrate, preferably, in the middle of one side of the fluorescent module, and some edges are reserved, that is, the area of the opening is smaller than the fluorescence of the opening The surface area of the module, and the edge of the opening and the edge of the fluorescent module are reserved with a base material. This design not only makes the processing convenient, but also the base material reserved at the edge can increase the mechanical strength of the overall structure of the fluorescent chip. The accommodating cavity has an opening, a side wall and a bottom, and the two opposite faces of the base body are not completely excavated when being dig, and the accommodating cavity is a accommodating cavity of the fluorescent module. The bottom surface of each of the receiving chambers of the base body is provided with a functional material, and the functional materials disposed adjacent to the two receiving chambers may be the same or different. The light collecting structure is an optical lens disposed above the functional material; or the light collecting structure is a reflective film, and correspondingly, the inner surface of the receiving cavity is in the shape of a paraboloid, and the reflective film is disposed on the side wall of the receiving cavity of the parabolic shape The upper part is used to concentrate the incident light onto the functional material, and the outgoing light guided by the conversion of the functional material is guided out in parallel from the opening.

As shown in FIG. 2, it is another structural diagram of a fluorescent chip. The embodiment shown in Fig. 2 is obtained by deformation on the basis of the embodiment of Fig. 1. Similarly, the fluorescent chip 2 includes a plurality of fluorescent modules 20, and each of the fluorescent modules 20 is arranged in a matrix. For example, each of the fluorescent modules 20 may be arranged in a one-dimensional array, a two-dimensional array, an n×m-dimensional array, or the like, wherein n and m are positive integers. The fluorescent module 20 includes a substrate 201, a functional material 203, and a light collecting structure (not shown in the figures). The base 201 of each fluorescent module is formed on the same side with a concave-shaped receiving cavity 202 having an opening 2021 for incident light entering and exiting light, and a functional material 203 is placed at the bottom of the receiving cavity 202. The light collecting structure is placed in the accommodating cavity 202, and the incident light incident into the accommodating cavity 202 is concentrated on the functional material 203, and the emitted light generated by the functional material 203 is emitted from the opening 2021, and the divergence angle of the laser is controlled. Within the preset range. Preferably, when the divergence angle is 0 degrees, the laser light generated by the conversion of the functional material 203 is parallelly emitted from the opening 2021.

The base body 101 of each of the fluorescent modules 20 may be integrally connected by respective mutually independent modules, or the structure of each of the fluorescent modules 20 may be integrally formed. When the base body 201 is integrally formed, the base body 201 may be composed of a complete block material having a better heat dissipation effect, for example, the base body 201 has a rectangular parallelepiped shape. The metal substrate is provided with a plurality of concave structures on one plane of the metal substrate, and the adjacent concave structures are equally spaced, and the space formed by each of the concave structures is a receiving cavity 202. The functional material 203 is applied to the bottom of the accommodating cavity 202 for converting at least a portion of the incident light into a laser light having a different wavelength from the incident light, or reflecting and scattering at least a portion of the incident light to be emitted.

Since the functional materials 203 of each of the fluorescent modules 20 are respectively disposed at the focus positions of the respective light collecting structures, the emitted light emitted by the incident light is parallel light, so that the fluorescent chip 2 becomes a surface having a small divergence angle. A distributed light source that can be used in display technology.

The inner surface of the accommodating cavity 202 is in the shape of a paraboloid, and the light collecting structure is a reflective film placed on the paraboloid surface, and the reflective film may be adhered to the inner surface of the accommodating cavity 202, or directly coated on the inner surface of the accommodating cavity 202, or It can be a plated reflective film. The functional material is disposed at the bottom of the receiving cavity 202, that is, at the focus of the parabolic shaped cavity.

In combination with the above embodiments, as shown in FIG. 3, the fluorescent chip 2 may further include a dimming device 206 for reducing the angle of the outgoing light, the dimming device 206 being placed at the opening of the parabolic shape to further emit The laser is converted into parallel light. Reducing the exiting light angle means that the solid angle of the emitted light in the case where the dimming device 206 is used is smaller than the solid angle of the emitted light in the case where the dimming device 206 is not used. For example, the dimming device 206 is provided as a lens or a light homogenizing rod or the like. The dimming device 206 is not limited to a lens or a homogenizing rod as long as it can convert the emitted light into a device in which parallel light is emitted. The arrangement of the dimming device 206 can further reduce the divergence angle of the laser light emitted from the opening, so that the light emitted from the fluorescent chip 2 becomes a surface-distributed light source having a small divergence angle.

In combination with the various embodiments described above, the fluorescent chip may further include a filter 205 disposed at the opening 2021 of the accommodating cavity 202 for filtering the emitted laser light. The filter 205 can also seal the openings 2021 of the respective receiving chambers 202 in the fluorescent chip, so that the respective receiving chambers 202 and the filter sheets 205 are enclosed to form a plurality of closed receiving spaces to prevent impurities such as dust and water vapor from entering. The internal space of the accommodating cavity 202 affects the conversion efficiency of the functional material and the heat dissipation efficiency. A filter film may also be disposed on the filter 205, and the filter film is placed on the filter 205 and located at the opening of each of the fluorescent modules to further perform color correction on the emitted light.

In addition to the above respective embodiments, the

substrates

101 and 201 can be fabricated using a metal plate, an aluminum substrate, a transparent silicon substrate, an aluminum nitride substrate, or the like. When selecting the materials for the

substrates

101 and 201, it is mainly considered to select a material having good heat dissipation properties, and the

substrates

101 and 201 can dissipate heat of the wavelength conversion material during the conversion of the excitation light into the laser light.

The

functional materials

103, 203 may include phosphors, fluorescent ceramics, quantum dots, and the like. The phosphor may be a yellow phosphor, a blue phosphor, a green phosphor, a red phosphor or the like. The

functional materials

103, 203 are only provided at the bottom of the

accommodating cavities

102, 202 and at the focus of the light collecting structure, and the angle of the diverging angle of the emitted laser light can be well controlled. When the excitation light is blue light, the fluorescent module in which the blue phosphor is disposed may replace the blue phosphor with a white scattering material powder, that is, a white scattering material powder is disposed at the bottom of the housing chamber of the partial fluorescent module. The white scattering material powder diffuses and reflects the incident blue laser light, thereby eliminating the coherence of the blue laser.

The fluorescent ceramics may be pure phase fluorescent ceramics, specifically various oxide ceramics, nitride ceramics or oxynitride ceramics, and a luminescent center is formed by incorporating a trace amount of activator elements (such as lanthanides) into the ceramic preparation process. . Alternatively, the fluorescent ceramic may be a composite ceramic in which a transparent/translucent ceramic is used as a matrix, and luminescent ceramic particles (such as phosphor particles) are distributed in the ceramic matrix. The transparent/translucent ceramic substrate may be various oxide ceramics (such as alumina ceramics, Y ₃ Al ₅ O ₁₂ ceramics), nitride ceramics (such as aluminum nitride ceramics) or oxynitride ceramics, and the role of the ceramic matrix is to Light and heat conduct, so that the excitation light can be incident on the luminescent ceramic particles, and the laser light can be emitted from the luminescent ceramic. The phosphor particles in the fluorescent ceramic bear the main illuminating function for absorbing the excitation light and converting it. For the laser.

In one embodiment, the

functional materials

103, 203 are capable of converting at least incident light into two different wavelength ranges of outgoing light. For example, the bottom of the receiving cavity of a part of the fluorescent module in the fluorescent chip is coated with a red phosphor material, and the bottom of the receiving cavity of another fluorescent module is coated with a green phosphor material. When the excitation light is incident on the red phosphor material, the red phosphor material is excited to generate a red laser beam, and the red laser beam passes through the light collecting structure to form a nearly parallel exit beam. When the excitation light is incident on the green fluorescent material, the green phosphor material is excited to generate a green laser, and the green laser is received. After the light collecting structure, a nearly parallel outgoing beam is formed. For another example, the functional material may further include a yellow phosphor material. The bottom of the receiving cavity of the partial fluorescent module is coated with a yellow phosphor material, and the yellow phosphor material receives the excitation light and is excited to generate a yellow laser, wherein the yellow laser is included. Red and green light, the use of yellow light can increase the brightness of the entire image.

The fluorescent chip in each of the above embodiments can be applied to a projection system, and can also be applied to a lighting system such as a stage lighting, a car headlight, a surgical lamp, or the like.

As shown in FIG. 5, it is a schematic diagram of a divergence angle formed by an exiting light emitted from an opening in a single fluorescent module, and the divergence angle is a straight line of a plane where the angle of the outgoing beam formed by the outgoing light is the largest and the plane of the opening of the vertical fluorescent module. The angle, as shown in Fig. 5, is the angle θ _{1 which is} the divergence angle. Preferably, when the divergence angle θ ₁ is 0 degrees, the outgoing beams formed by the laser light are emitted in parallel. Due to the structure of the fluorescent module, the location of the functional materials, and the influence of factors such as process manufacturing, the divergence angle is controlled at 0 degrees, and it is necessary to strictly control the processing precision and each process in the manufacturing process. When the divergence angle is controlled within a preset range, the laser beam emitted from the opening is close to the parallel beam, and can also be applied to the display field, and the divergence angle is preset to a range of 0 to 17 degrees. The divergence angle is controlled within the range of 0 to 17 degrees, and the emitted laser light can be regarded as parallel light. For example, in practical applications, the divergence angle can be controlled within a range of 3 degrees, 5 degrees, 7 degrees, 10 degrees, 12 degrees, or 15 degrees, and the laser applied to the display technology can achieve the required requirements. effect.

As shown in FIG. 6 , which is a relationship between the height of the receiving cavity and the width of the opening in a single fluorescent module, in order to control the divergence angle of the laser light within a preset range, it is necessary to define the relationship between the height of the receiving cavity and the width of the opening. , provided the functional material disposed at the height of the bottom of the receiving chamber is d _1, the upper surface functional material to the height of the opening is d _2, the receiving chamber height H, the radius of the opening is R, the divergence angle θ _1. According to the trigonometric relationship, there is a divergence angle of tan θ ₁ = R / H, that is, controlling the proportional relationship between the height of the accommodating cavity and the diameter of the opening, so that the divergence angle can be controlled within the required range.

When the divergence angle θ _{1 is} controlled at 17 degrees, R/H is about 0.3, that is, the radius R of the opening is 0.3 times the height H of the accommodating cavity, and the radius R of the control opening is controlled when the divergence angle is controlled within the range of 17 degrees. The height H of the accommodating chamber may be 0.3 times or less. When the divergence angle θ _{1 is} controlled at 12 degrees, R/H is about 0.2, that is, the radius R of the opening is 0.2 times the height H of the accommodating cavity, and the radius R of the control opening is controlled when the divergence angle is controlled within the range of 12 degrees. The height H of the accommodating chamber may be 0.2 times or 0.2 times or less. When the divergence angle θ _{1 is} controlled at 5 degrees, R/H is about 0.09, that is, the radius R of the opening is 0.09 times the height H of the accommodating cavity, and the radius R of the control opening is controlled when the divergence angle is controlled within a range of 5 degrees. The height H of the accommodating chamber may be 0.09 times or less.

In the embodiment shown in FIG. 2 or FIG. 3, the area where the functional material is placed at the bottom of the accommodating chamber is S ₂ , the area of the opening of the accommodating chamber is S ₁ , and the angle of divergence of the emitted light on the surface of the functional material is θ ₂ . The divergence angle of the light at the opening is θ ₁ . According to the conservation of optical expansion, S ₁ sin ² θ ₁ =S ₂ sin ² θ ₂ can be obtained, wherein the divergence angle of the emitted light on the surface of the functional material is θ _{2 and the} maximum value is 90 degrees, and when θ ₂ is 90 degrees, S ₂ /S ₁ =sin ² θ ₁ , that is, the relationship between the area of the opening of the accommodating chamber and the area of the functional material formed at the bottom of the accommodating chamber is related to the angle of the divergence angle, that is, it is necessary to control the outgoing light from the opening. The angular extent of the divergence angle of the exit can be achieved by controlling the proportional relationship between the area of the functional material in each of the fluorescent modules and the area of the opening.

When θ ₁ is 17 degrees, S ₂ /S ₁ =sin ² 17°, that is, S ₁ is about 11 times that of S ₂ ; when the divergence angle needs to be controlled within the range of 17 degrees, the area S _{1 of the} opening of the accommodating chamber is controlled. It is greater than or equal to 11 times the area S ₂ of the functional material placed at the bottom of the accommodating chamber. That is, when the angle of θ ₁ is controlled within the range of 17 degrees, the area at the opening is at least 11 times the area of the functional material filled at the bottom of the accommodating chamber. When θ ₁ is 12 degrees, S ₂ /S ₁ =sin ² 12°, that is, S ₁ is about 25 times that of S ₂ ; when the divergence angle needs to be controlled within the range of 12 degrees, the area S _{1 of the} opening of the accommodating chamber is controlled. It is greater than or equal to 25 times the area S ₂ of the functional material placed at the bottom of the accommodating chamber. That is, when the angle of θ ₁ is controlled within the range of 12 degrees, the area at the opening is at least 25 times the area of the functional material filled at the bottom of the accommodating chamber. When θ ₁ is 8 degrees, S ₂ /S ₁ =sin ² 8°, that is, S ₁ is about 52 times S ₂ ; when the divergence angle needs to be controlled within 8 degrees, the area S _{1 of the} accommodating cavity opening is controlled. It may be greater than or equal to 52 times the area S ₂ of the functional material placed at the bottom of the accommodating chamber. That is, when the angle of θ ₁ is controlled within the range of 8 degrees, the area at the opening is at least 52 times the area of the functional material filled at the bottom of the accommodating chamber. When θ ₁ is 5 degrees, S ₂ /S ₁ =sin ² 5°, that is, S ₁ is about 125 times of S ₂ ; when the divergence angle needs to be controlled within 5 degrees, the area S _{1 of the} opening of the accommodating cavity is controlled. It is greater than or equal to 125 times the area S ₂ of the functional material placed at the bottom of the accommodating chamber. That is, when the angle of θ ₁ is controlled within a range of 5 degrees, the area at the opening is at least 125 times the area of the functional material filled at the bottom of the accommodating chamber.

As shown in FIG. 4, it is a further schematic structural view of the fluorescent chip 3, which schematically shows the face of the fluorescent chip 3 incident/exiting light. The fluorescent chip 3 is arranged in a two-dimensional matrix by a plurality of fluorescent modules 30, wherein adjacent two fluorescent modules 30 emit light of the same color or different colors. For example, two adjacent fluorescent modules 30 may be provided with different wavelength converting materials to be excited to generate laser light of different wavelength ranges.

For example, when several fluorescent modules 30 form an array of 9 columns and 6 rows, the colors of the light emitted by the nine fluorescent modules in the first row are red, green, blue, red, green, blue, red, green, blue. Color; the color of the light emitted by the nine fluorescent modules in the second row is red, green, blue, red, green, blue, red, green, blue; the light emitted by the nine fluorescent modules in the third row The colors are red, green, blue, red, green, blue, red, green, and blue; the colors of the light emitted by the nine fluorescent modules in the fourth, fifth, and sixth rows are emitted in the first row. The order of the colors of the light is consistent. That is to say, each of the fluorescent modules in the first row sequentially emits light of three colors in a certain order, and the colors of the emitted light in the other rows are consistent with the order of the colors of the outgoing light in the first row. That is, the color of the emitted light of each fluorescent module in each column is the same, and the colors of the emitted light of the adjacent two columns of fluorescent modules are different.

For another example, when a plurality of fluorescent modules 30 form an array of 9 columns and 6 rows, the colors of the light emitted by the nine fluorescent modules in the first row are red, green, blue, red, green, blue, red, green, Blue; the color of the light emitted by the nine fluorescent modules in the second row is blue, red, green, blue, red, green, blue, red, green; the light emitted by the nine fluorescent modules in the third row The colors are green, blue, red, green, blue, red, green, blue, and red. The color of the light emitted by the nine fluorescent modules in the fourth row is the same as the color of the light emitted in the first row. The color of the light emitted by the nine fluorescent modules in the fifth row is consistent with the order of the colors of the outgoing light in the second row; the order of the color of the light emitted by the nine fluorescent modules in the sixth row and the color of the outgoing light in the third row Consistent. By analogy, it can be extended to more fluorescent modules composed of fluorescent modules.

As shown in FIG. 4, in a fluorescent chip, a bottom portion of a receiving cavity in a part of the fluorescent module 30 is provided. The blue fluorescent material 301 or the scattering material, the bottom of the receiving cavity of the partial fluorescent module 30 is provided with a green fluorescent material 302, and the bottom of the receiving cavity of the partial fluorescent module 30 is provided with a red fluorescent material 303, wherein two adjacent fluorescent modules 30 Set different colors of fluorescent materials. In this embodiment, it is a matrix of 8×9, that is, there are 8 rows and 9 columns, and the specific number of rows and columns can be determined according to actual conditions. For example, each adjacent four fluorescent modules may constitute one pixel, at least one fluorescent module of one pixel emits blue outgoing light, at least one fluorescent module emits red outgoing light, and at least one fluorescent module emits green. The outgoing light. The fluorescent module that emits the blue light may be provided with a blue fluorescent material, or when the incident excitation light is a blue laser, the fluorescent module that emits the blue outgoing light is provided with a scattering material.

When the excitation light is incident on the fluorescent chip 3, it can be excited to generate laser light of different colors, and the light beam formed by the laser light is close to the parallel light beam, that is, the laser beam is perpendicular to the plane where the exit of the cavity is located. When the excitation light is incident on the red fluorescent material 303, the red fluorescent material 303 is excited to generate a red laser, and the red light emitted from each of the fluorescent modules 30 provided with the red fluorescent material 303 is emitted by the approximately parallel beam of the laser, so that the fluorescent chip 3 When the red light is emitted by the laser, it is a red surface light source that is approximately parallel. When the excitation light is incident on the green fluorescent material 302, the green fluorescent material 302 is excited to generate a green laser light, and the green light emitted from each of the fluorescent modules 30 provided with the green fluorescent material 302 is emitted by the approximately parallel light beam, so that the fluorescent chip 3 When the green light is emitted by the laser, it is a green surface light source that emits approximately parallel. When the excitation light is incident on the blue fluorescent material 301, the blue fluorescent material 301 is excited to generate a blue laser light, and the blue light emitted from each of the fluorescent modules 30 provided with the blue fluorescent material 301 is emitted by the approximately parallel laser beam. Therefore, the fluorescent chip 3 emits a blue surface light source that emits in a nearly parallel direction when the blue light is received by the laser light.

The embodiment of the invention further provides a display system comprising a light source and a fluorescent chip, wherein the fluorescent chip is the fluorescent chip described in any of the above embodiments. The light source is used to emit excitation light. For example, the light source may be an LD array, an LED, a laser diode, a laser, or the like. The excitation light generated by the light source is shaped by a shaping device to form a uniform spot, and the spot enters the fluorescent chip. The fluorescent chip receives the excitation light and generates laser light of different wavelength ranges, and is exposed to the laser in approximately parallel directions. The display system can For television systems, projection systems, etc., such as cinema projectors, laser TVs, engineering projectors, educational projectors, splicing screen projectors, etc.

The display system may further include a light modulator disposed on the optical path of the excitation light emitted by the light source, and the excitation light is shaped by the shaping device to form a uniform spot, and the spot is re-entered into the light modulator. The modulation forms a monochromatic image light that is imaged onto a fluorescent chip, and each of the fluorescent modules on the fluorescent chip receives the image light and generates laser light of different wavelength ranges, and the laser light is emitted in parallel. Each of the fluorescent modules on the fluorescent chip can receive the image light at the same time, or partially receive the image light, or can receive the image light according to a certain timing or arrangement, thereby emitting the color image light.

The fluorescent chip 3 shown in Fig. 4 corresponds to a display system employing a spatial light modulator. When three spatial light modulators are used in the display system, the three spatial light modulators respectively modulate image light of one color. At this time, three fluorescent chips may be corresponding, and one fluorescent chip corresponds to one spatial light modulator, and each of the fluorescent chips corresponds to one spatial light modulator. The fluorescent chip only emits a surface light source of one color. For example, the first spatial light modulator is used to modulate blue image light, and the first fluorescent chip corresponding to the first spatial light modulator receives the image light to generate blue outgoing light, and the first fluorescent chip emits light. a blue surface light source that emits approximately parallel; a second spatial light modulator is used to modulate the green image light, and a second fluorescent chip corresponding to the second spatial light modulator receives the image light and is excited to generate a green laser light, the green When the laser light is emitted from the second fluorescent chip, the green surface light source is approximately parallel; the third spatial light modulator is used to modulate the red image light, and the third fluorescent chip corresponding to the third spatial light modulator receives the image light to generate the image light. The red laser is a red surface light source that is approximately parallel to the laser when it is emitted from the third fluorescent chip.

In another embodiment, the display system may further include only one spatial light modulator and three fluorescent chips, and the three fluorescent chips are monochromatic fluorescent chips (that is, the functional materials of the fluorescent modules in the fluorescent chip are the same), and the space The image light emitted by the light modulator is sequentially supplied to the three fluorescent chips in time series, so that the images emitted by the three fluorescent chips are combined and time-synthesized to obtain a color image.

The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

A fluorescent chip, comprising: a plurality of fluorescent modules, wherein the fluorescent modules are arranged in a matrix;

Each of the fluorescent modules includes a substrate, a functional material, and a light collecting structure;

The base of each of the fluorescent modules is formed with a concave-shaped receiving cavity on the same side, and the receiving cavity has an opening for incident light and emitted light;

The functional material is placed at the bottom of the accommodating cavity, and the functional material is a wavelength converting material or a scattering material, and the wavelength converting material is configured to receive incident light to generate a laser beam different from the wavelength of the incident light, the scattering material. For reflecting and scattering incident light and then emitting;

The light collecting structure of each of the fluorescent modules is disposed in the accommodating cavity, concentrating incident light incident into the accommodating cavity onto the functional material, and receiving the incident light after the functional material is received The generated emitted light is emitted from the opening, and the divergence angle of the emitted light is controlled within a preset range, so that each of the fluorescent modules constitutes a surface light source that emits approximately parallel light.
The fluorescent chip according to claim 1, wherein the accommodating chamber has an inverted trapezoidal shape, an inverted polygonal plate shape or a rounded table shape.
The fluorescent chip according to claim 1, wherein the light collecting structure is an optical lens placed at an opening position of the accommodating chamber, and the functional material is placed at a focus position of the optical lens.
The fluorescent chip according to claim 1, wherein an inner surface of the accommodating chamber is in a parabolic shape, the light collecting structure is a reflective film placed on the paraboloid, and the functional material is placed on the paraboloid The focus position.
The fluorescent chip according to claim 4, wherein the fluorescent chip further comprises a dimming device for reducing an exiting light angle, the dimming device being disposed at an opening of the receiving chamber.
The fluorescent chip according to claim 5, wherein the dimming device is a lens or a light homogenizing rod.
The fluorescent chip according to claim 1, wherein the substrate is a metal plate, a transparent silicon substrate or an aluminum nitride substrate.
The fluorescent chip according to claim 1, wherein each of the four adjacent fluorescent modules constitutes one pixel, and at least one of the pixels has a fluorescent module that emits blue light, at least one of which is emitted. The red-emitting light fluorescent module has at least one fluorescent module that emits green light.
The fluorescent chip according to any one of claims 1 to 8, characterized in that the divergence angle of the outgoing light emitted from the opening ranges from 0 to 17 degrees.
The fluorescent chip according to any one of claims 1 to 8, characterized in that the radius of the accommodating chamber opening is less than or equal to 0.2 times the height of the accommodating chamber.
The fluorescent chip according to any one of claims 1 to 8, characterized in that the area at the opening is at least 25 times the area of the functional material filled at the bottom of the accommodating chamber.
The fluorescent chip according to any one of claims 1 to 8, wherein the fluorescent chip further comprises a plurality of filters, the number of the plurality of filters being consistent with the number of the plurality of fluorescent modules, the plurality of Filters are respectively placed over the respective fluorescent modules and seal the opening of the receiving chamber.
The fluorescent chip according to claim 12, wherein the filter is an angle selection filter capable of transmitting light of less than a predetermined angle and reflecting light of other angles.
A display system, comprising: a light source, and the fluorescent chip according to any one of claims 1 to 13, the light source for emitting excitation light, the fluorescent chip receiving the excitation light and generating different wavelength ranges The laser is received and the laser is approximately parallel to the laser.
A display system according to claim 14 wherein said display system further comprises a light modulator disposed on an outgoing light path of said light source for converting said excitation light to a single color The image light is output to the fluorescent chip; the fluorescent chip receives the monochromatic image light and generates laser light of different wavelength ranges, and the laser light is emitted in approximately parallel directions.