WO2022089024A1

WO2022089024A1 - Projection display system

Info

Publication number: WO2022089024A1
Application number: PCT/CN2021/117260
Authority: WO
Inventors: 胡飞; 陈彦哲; 陈晨; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2020-10-29
Filing date: 2021-09-08
Publication date: 2022-05-05
Also published as: CN213987157U

Abstract

A projection display system, a light-emitting assembly (10) in the projection display system being used for producing laser light; a light guide assembly (20) is used for controlling the transmission direction of the laser light and the light reflected on the light guide assembly (20); a wavelength conversion apparatus (30) comprises a first area and a second area, the first area comprising a plurality of modules (31) used for converting a first laser light into excited laser light and transmitting the excited laser light and a second laser light, and the second area being used for reflecting a third laser light; a display apparatus (40) is arranged on the emergent light path of the wavelength conversion apparatus (30), and is used for receiving the excited laser light and the second laser light; the display apparatus (40) comprises a plurality of pixel areas (41) corresponding on a one-to-one basis to the plurality of modules (31); first excited laser light is transmitted to the display apparatus (40), and recovered light is reflected by the light guide assembly (20) to be incident on the wavelength conversion apparatus (30) again. The present projection display system can reduce energy loss and increase the efficiency of energy utilisation.

Description

A projection display system

technical field

The present application relates to the field of display technology, and in particular, to a projection display system.

Background technique

At present, the methods for improving the system efficiency of liquid crystal display (LCD, Liquid Crystal Display) include increasing the aperture ratio and increasing the purity of the polarization state. However, due to the limitation of the process, it is difficult to improve the aperture ratio after reaching a certain level; in addition, after the purity of the polarization state is increased, the energy utilization efficiency can only be doubled at most.

Utility model content

The present application provides a projection display system capable of reducing energy loss and improving energy utilization efficiency.

In order to solve the above technical problems, the technical solution adopted in this application is to provide a projection display system, the projection display system includes a light-emitting component for generating laser light, and the laser light includes a first laser, a second laser and a third laser; a guide component, arranged on the transmission light path of the laser light emitted by the light-emitting component, and used for controlling the transmission direction of the laser light and the light reflected to the light guide component; a wavelength conversion device, arranged on the light guide The outgoing light path of the component includes a first area and a second area, the first area includes a plurality of modules, and the plurality of modules include a wavelength conversion area and a transmission/scattering area, wherein the wavelength conversion area is used to convert the The first laser light irradiated to the wavelength conversion region is converted into received laser light, and the transmission/scattering region is used to transmit the second laser light irradiated to the transmission/scattering region, so that the received laser light and the second laser light are common The wavelength conversion device is transmitted out, and the second area is used to reflect the third laser light irradiated to the second area to form recovered light and transmit it to the light guide assembly, and through the light guide assembly After being reflected, it continues to enter the first area and the second area of the wavelength conversion device; a display device is arranged on the outgoing light path of the wavelength conversion device, and is used for receiving the received laser light and the second laser light, and the display device It includes a plurality of pixel regions, and the sub-pixel regions of the plurality of pixel regions are in one-to-one correspondence with the sub-modules of the plurality of modules.

Through the above solution, the beneficial effects of the present application are: the light-emitting component can generate laser light, and the laser light is guided by the light guide component to the wavelength conversion device, the first laser light excites the wavelength conversion material in the wavelength conversion device to generate the corresponding received laser light, and at the same time the first laser light excites the wavelength conversion material in the wavelength conversion device. The second laser can be directly incident to the display device through the wavelength conversion device, the received laser can be directly injected into the display device, and the third laser can be reflected by the wavelength conversion device to form recovered light, which can be reflected to the light guide assembly, After the guide component is reflected, it is injected into the wavelength conversion device again, and after being processed by the wavelength conversion device, it is recycled again, so as to achieve a higher energy utilization efficiency and help improve the energy utilization efficiency of display using a single LCD panel.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort. in:

Fig. 1 is the structural representation of TFT-LCD;

2 is a schematic structural diagram of a first embodiment of a projection display system provided by the present application;

Figure 3 (a) is a schematic diagram of the arrangement of modules in the embodiment shown in Figure 2;

Figure 3 (b) is a schematic diagram of the arrangement of pixel regions in the embodiment shown in Figure 2;

4 is a schematic structural diagram of a second embodiment of a projection display system provided by the present application;

Fig. 5 (a) is the arrangement schematic diagram of the module in the embodiment shown in Fig. 4;

FIG. 5(b) is a schematic diagram of the arrangement of pixel regions in the embodiment shown in FIG. 4;

6 is a schematic structural diagram of a third embodiment of a projection display system provided by the present application;

Figure 7 is a schematic diagram of beam propagation in the embodiment shown in Figure 6;

8 is a schematic structural diagram of a fourth embodiment of a projection display system provided by the present application;

Fig. 9 is the schematic diagram of the module in the embodiment shown in Fig. 8;

Figure 10 is a schematic diagram of beam propagation in the embodiment shown in Figure 8;

FIG. 11 is a schematic structural diagram of a fifth embodiment of a projection display system provided by the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

The principle of liquid crystal display is: based on the characteristics that the transmittance of liquid crystal molecules changes with the magnitude of the applied voltage, the incident light first passes through the polarizer and becomes linearly polarized light that is consistent with the polarization direction of the polarizer, and is consistent with the order of the liquid crystal molecules. ; When the light passes through the liquid crystal layer, according to the principle of liquid crystal birefringence, the linearly polarized light is decomposed into two beams of light, and the two beams of light travel at different speeds. When the two beams of light are combined into one beam of light, the polarization direction of the light will change. , the light passing through the liquid crystal layer will be gradually twisted, and the optical axis vibration direction is just deflected by 90 degrees when it reaches the analyzer, which is consistent with the direction of the analyzer. At this time, the light can pass through the analyzer to form a bright field; when a voltage is applied, the liquid crystal The orientation of the molecules disappears under the action of the electric field, the light does not undergo polarization in the vibration direction after passing through the liquid crystal molecules, and cannot pass through the analyzer, forming a dark field and completing the modulation of the light.

At present, most of the thin film transistor liquid crystal displays (TFT-LCD, Thin Film Transistor Liquid Crystal Display) are used for liquid crystal display. The structure of TFT-LCD is shown in Figure 1. Layer 104, color filter 105 and upper polarizer 106, the white light emitted by the backlight 101 first passes through the lower polarizer 102 to become linearly polarized light, then modulates through the liquid crystal layer 104, and then changes into color through the color filter 105 The separated three colors of R (Red, red), G (Green, green), and B (Blue, blue) are finally emitted through the upper polarizer 106, and the three color bars of R, G, and B together form a pixel. The limitation of the resolution of the corner of the human eye, so it appears as a colored pixel. However, when the white light passes through the lower polarizer 102 to obtain polarized light, it will lose about one-half of the energy, and then pass through the TFT substrate 103. Due to the limited aperture ratio of the TFT substrate 103, about one-half of the light will be lost at this time, and then pass through the TFT substrate 103. The color filter 105 loses about two-thirds of the energy, so the energy utilization efficiency is about 1/2*1/3*1/2=8.3%.

It can be seen from the above analysis that the energy utilization rate in the current liquid crystal display solution is low. In order to improve the energy utilization efficiency, the present application uses the idea that the light beam can be recycled repeatedly in the projection display system. The specific solution will be described in detail below.

Please refer to FIG. 2 . FIG. 2 is a schematic structural diagram of a first embodiment of a projection display system provided by the present application. The projection display system includes a light emitting component 10 , a light guide component 20 , a wavelength conversion device 30 and a display device 40 .

The light-emitting component 10 is used to generate laser light. The light-emitting component 10 can be a laser. The laser light emitted by the laser can be polarized light or non-polarized light. If the laser light emitted by the laser is polarized light, the polarization state of the polarized light can be S polarization state or P polarization state. polarization state.

The light guide assembly 20 is arranged on the transmission light path of the laser light emitted by the light emitting assembly 10, and is used to control the transmission direction of the laser light and the light reflected to the light guide assembly; Its forward incident light is transmitted, and the light incident from its back is reflected, such as a regional diaphragm, a through hole is arranged in the middle of the regional diaphragm for transmitting the forward incident from the regional diaphragm, and other areas are used for reflection. Light incident on the area diaphragm from the back. The light guide assembly 20 can also be an area blue and inverse yellow filter, the laser light emitted by the light emitting assembly 10 can be transmitted by the blue and yellow transparent area in the middle of the light guide assembly 20, and light of other wavelengths is irradiated to other areas of the light guide assembly. is reflected.

The wavelength conversion device 30 is disposed on the outgoing light path of the light guide assembly 20 , and is used to reflect, convert, transmit or scatter the light incident on the wavelength conversion device 30 . The wavelength conversion device 30 includes a first region and a second region, the first region includes a plurality of modules 31, and each module includes a wavelength conversion region and a transmission/scattering region.

Wherein, for the convenience of description, it is defined herein that the laser light emitted by the emitting component 10 is represented by the first laser, the second laser and the third laser. It can be understood that the sum of the energy of the first laser, the second laser and the third laser is the emitting component 10 The energy of the laser light emitted. Specifically, the laser irradiated to the wavelength conversion region of the first region is the first laser, the laser irradiated to the transmission/scattering regions of the plurality of modules in the first region is the second laser, and the laser irradiated to the second region is the third laser .

As shown in FIG. 3( a ), each module 31 in the first region is used to receive the first laser light and the second laser light, convert the first laser light irradiated to the wavelength conversion region into the received laser light, and transmit the second laser light , so that the received laser light and the second laser light are transmitted together from the wavelength conversion device 30; the second area is used to reflect the third laser light to form recycled light and transmit it to the light guide assembly 20; The recycled light is irradiated to the light guide assembly After 20, it will be transmitted to the first area and the second area of the wavelength conversion area again to be recycled. After multiple optical cycles, the light utilization rate is improved. Specifically, the wavelength conversion device 30 may be a fluorescent chip, and the above-mentioned first area and second area are provided on the fluorescent chip.

The display device 40 is disposed on the outgoing light path of the wavelength conversion device 30, and is used for receiving the received laser light and the second laser light emitted from the wavelength conversion device; It includes a plurality of pixel areas 411 . As shown in FIG. 3( b ), the plurality of pixel areas 411 are in one-to-one correspondence with the plurality of modules 31 .

This embodiment provides a projection display system that uses the light-emitting component 10 to generate laser light, and the laser light is guided by the light guide component 20 to the wavelength conversion device 30 , wherein the first laser light is irradiated to the wavelength conversion area of the wavelength conversion device 30 to generate a laser Laser, the second laser is irradiated to the transmission/scattering area and then transmitted, and is incident on the display device 40 together with the received laser light, and the third laser is irradiated to the second area of the wavelength conversion device 30 and is reflected to form recovered light, and the recovered light returns The light guide assembly 20 is reflected by the light guide assembly 20 and then incident on the wavelength conversion device 30 again to perform optical circulation, thereby achieving higher energy utilization efficiency, which is helpful for improving the energy utilization efficiency of displaying with a single LCD panel.

Please refer to FIG. 4 , which is a schematic structural diagram of a second embodiment of the projection display system provided by the present application. The projection display system includes: a laser 10 , a blue and inverse yellow filter 20 , a fluorescent chip 30 and a display device 40 .

The laser 10 is a blue laser, that is, the laser is a blue laser; the blue laser can be transmitted to the fluorescent chip 30 by the blue-transmitting anti-yellow filter 20, and the fluorescent chip 30 is composed of a first area and a second area, and the first area is provided with A plurality of modules 31 with pixel size, as shown in FIG. 5(a), each module 31 includes a wavelength conversion area and a transmission/scattering area 313, wherein the wavelength conversion area includes a first wavelength conversion area 311 and a second wavelength conversion area 311 The region 312, the first wavelength conversion region 311, the second wavelength conversion region 312, and the transmission/scattering region 313 together constitute each module 31 as sub-modules. The shapes of the sub-pixel regions in the pixel region 411 are matched.

Further, the first wavelength conversion area 311 is provided with a red wavelength conversion material, such as red phosphor powder, and the red wavelength conversion material can generate red fluorescence under the excitation of the blue laser; the second wavelength conversion area 312 is provided with a green wavelength conversion material, such as Green phosphor powder, the green wavelength conversion material can generate green fluorescence under the excitation of blue laser light, that is, the received laser light emitted from the phosphor chip 30 includes red fluorescence and green fluorescence, and the transmission/scattering area 313 can scatter or transmit the incident blue laser light .

The display device 40 includes a display panel 41 , a polarizer 42 and an analyzer 43 . The polarizer 42 is disposed on the outgoing light path of the fluorescent chip 30 , and is used to obtain light having a first polarization state from the light emitted from the fluorescent chip 30 . Light. The display panel 41 is disposed on the outgoing light path of the polarizer 42 and is used for receiving the light emitted by the polarizer 42 . The display panel 41 includes a plurality of pixel areas 411 , and the number of the pixel areas of the display panel 41 and the number of the modules 31 are The same, and the sub-modules of the module 31 are in one-to-one correspondence with the sub-pixel regions of the corresponding pixel region 411 , that is, the positions along the optical axis direction overlap.

Further, each pixel area 411 includes a red sub-pixel area 4111 , a green sub-pixel area 4112 and a blue sub-pixel area 4113 . As shown in FIG. 5( b ), the red sub-pixel area 4111 corresponds to the first wavelength conversion area 311 , the green sub-pixel area 4112 corresponds to the second wavelength conversion area 312, and the blue sub-pixel area 4113 corresponds to the transmission/scattering area 313; the display panel 41 may be an LCD panel, which includes a TFT, a liquid crystal layer and a color filter (Fig. not shown), the red sub-pixel region 4111 is provided with a red filter, the green sub-pixel region 4112 is provided with a green filter, and the blue sub-pixel region 4113 is provided with a blue filter.

The analyzer 43 is disposed on the outgoing light path of the display panel 41, and is used to convert the light outgoing from the display panel 41 into image light, and the outgoing image light can be transmitted or directly imaged by a lens (not shown in the figure).

Since the second area is set on the wavelength conversion device in this embodiment, the third laser light that is not irradiated to the first area can be reflected back to the light guide component by the second area, and then re-reflected by the light guide component and then enters the wavelength conversion device again for processing. Transmission and conversion, after many cycles, most of the illumination light can be emitted to the display device 40 through the wavelength conversion device. The cost of the system is low, the structure is simple, and the energy utilization efficiency is doubled compared with the single LCD system in the prior art.

For a saturated light source, since the LCD requires the incident light to be polarized light, a polarizer can be placed before the light path of the LCD for filtering, but half of the energy will be lost when the light source passes through the polarizer, and the efficiency is low. Increasing the polarization state purity of the light source improves the energy utilization efficiency of the system. For example, a prismatic brightness enhancement film (BEF, Brightness Enhancement Film) is added to correct the direction of the light through the surface microstructure prism array, so that the light can be concentrated on the front, and the light outside the viewing angle can be reflected and recycled, thereby improving the energy utilization efficiency and brightness of the light source. In addition, a reflective polarized brightness enhancement film (DBEF, Dual Brightness Enhancement Film) can also be used to improve the energy utilization efficiency, as shown in Figure 6.

Please refer to FIG. 6. FIG. 6 is a schematic structural diagram of a third embodiment of the projection display system provided by the present application. The difference from the embodiment shown in FIG. 4 is that the projection display system in this embodiment further includes a DBEF 50, a first microcomputer The lens array 60 and the second microlens array 70 .

Micro-lens arrays for light-receiving are provided at the front and rear of the fluorescent chip 30 . The micro-lens array includes a plurality of micro-lenses, and each micro-lens corresponds to a sub-module in the fluorescent chip 30 ; specifically, the first micro-lens array 60 The second microlens array 70 is disposed on the outgoing light path of the laser light, and is used for collecting and collimating the laser light; the second microlens array 70 is disposed on the outgoing light path of the received laser light, and is used for collecting and collimating the received laser light.

Further, the first microlens array 60 and the second microlens array 70 are arranged on both sides of the first wavelength conversion area, and the first microlens array 60 and the second microlens array 70 are arranged on both sides of the second wavelength conversion area , the first micro-lens array 60 and the second micro-lens array 70 are arranged on both sides of the scattering area, and the scattering angle of the scattering area includes but is not limited to the Lambertian scattering area or the scattering sheet with a larger angle, so as to achieve a good scattered speckle Effect.

Further, the blue laser light generated by the laser 10 may be linearly polarized light or non-linearly polarized light. The blue laser light passes through the first microlens array 60 and becomes a collimated blue laser light, and the collimated blue laser light is injected into the fluorescent chip. 30. Excite the phosphor to generate red fluorescence and green fluorescence.

It can be understood that when the blue laser light passes through the transmission/scattering area of the phosphor chip 30, it can directly pass through to the DBEF 50. If the transmission/scattering area is the transmission area, the blue laser light can pass directly; if the transmission/scattering area is the scattering area, The scattering area is provided with a scattering sheet, which can suppress speckle. At this time, the blue and anti-yellow transmissive filter 20 can be replaced with a blue and anti-yellow transmissive filter that transmits P-polarized light and reflects S-polarized light.

The DBEF 50 is arranged on the outgoing light path of the fluorescent chip 30. The principle of the DBEF 50 is: using two materials with different refractive indices to form a multilayer film to achieve the effect of transmitting the P-polarized light and reflecting the S-polarized light. Placing some optical elements at the S-polarized light, such as a quarter-wave plate, can convert the S-polarized light to P-polarized light and re-irradiate it on the DBEF 50, thereby improving the energy utilization efficiency.

The DBEF 50 is used to transmit the first outgoing light with the first polarization state emitted from the fluorescent chip 30, adjust the transmission direction of the first outgoing light, and reflect the second outgoing light with the second polarization state to the fluorescent chip 30, The second outgoing light passes through the fluorescent chip 30 and reaches the blue and yellow transmissive filter 20 , and is reflected by the blue and yellow transmissive filter 20 , and then enters the fluorescent chip 30 again.

Further, the second received laser light in the laser light can be reflected by the DBEF 50 to form a recovered light and transmitted to the light guide assembly 20, that is, the recovered light includes the second outgoing light and the third laser light; the first outgoing light has the first outgoing light. The first received laser light with the first polarization state and the second laser light with the first polarization state, and the second outgoing light is the second received laser light with the second polarization state and the second laser light with the second polarization state; The second polarization state is the P polarization state, and the second polarization state is the S polarization state.

The blue laser passes through the blue-transmitting anti-yellow filter 20 and then reaches the fluorescent chip 30 to be excited to generate fluorescence or be scattered; specifically, the blue laser passes through the blue-transmitting anti-yellow filter 20 and the fluorescent chip 30 in turn to reach the DBEF 50, and has a first polarization. The first blue laser light in the state is transmitted to the display device 40 through the DBEF 50, the second blue laser light with the second polarization state is reflected to the phosphor chip 30 by the DBEF 50, and the spatial angle of the fluorescence generated by excitation or the light scattered by the Lambertian scattering plate is 4π, after the collection of the front and rear microlenses, it becomes a saturated collimated beam, and the collimated beam propagates along the optical axis toward the DBEF 50 and the blue-transparent anti-yellow filter 20 respectively.

Further, the DBEF 50 can transmit the first fluorescence in the fluorescence and correct the direction of the first fluorescence. The first fluorescence is P-polarized light, and the second fluorescence in the fluorescence (ie, the S-polarized light) returns and passes through the fluorescence chip 30 again. , the fluorescence will not be excited again at this time, but the fluorescent chip 30 will disperse the light again, the polarization state will be disrupted, and become S-polarized light with impure polarization state. The reflection of the light sheet 20 reaches the fluorescent chip 30, is scattered again, and then reaches the DBEF 50 again, and passes through part of the P-polarized light, so as to circulate, so that most of the light becomes P-polarized light and exits from the DBEF 50; The light in the direction of the blue-transmitting anti-yellow filter 20 is reflected by the blue-transmitting anti-yellow filter 20 to reach the fluorescent chip 30, and after being scattered, it reaches the DBEF 50. At this time, the light reaching the DBEF 50 is saturated light.

In a specific embodiment, the beam propagation is shown in FIG. 7 , the blue laser is denoted as B, and the blue laser can reach the fluorescent chip 30 through the blue-transmitting anti-yellow filter 20 . In the first wavelength conversion region of the fluorescent chip 30, The blue laser excites the red phosphor to generate red fluorescence, denoted as R(P+S), the red fluorescence can pass forward through the DBEF 50 and be transmitted or reflected by the DBEF 50, and the first red fluorescence (that is, the red fluorescence in the transmitted part) is denoted as R(P), the second red fluorescence (that is, the red fluorescence in the reflection part) is denoted as R(S), the reflected red fluorescence can be scattered by the red phosphor into unpolarized light, and the unpolarized light is filtered by blue-transmitting and anti-yellow filters. After the light sheet 20 is reflected, it enters the first wavelength conversion area and continues to circulate; in the second wavelength conversion area of the fluorescent chip 30, the blue laser excites the green phosphor to generate green fluorescence, denoted as G(P+S), and the green fluorescence can be Passing forward through DBEF 50 and being transmitted or reflected by DBEF 50, the first green fluorescence (ie the green fluorescence of the transmission part) is denoted as G(P), and the second green fluorescence (ie the green fluorescence of the reflection part) is denoted as G(S) , the reflected green fluorescent light can be scattered by the green fluorescent powder into unpolarized light, and the unpolarized light is reflected by the blue-transmitting anti-yellow filter 20 and then enters the second wavelength conversion area, and continues to circulate; in the scattering area of the fluorescent chip 30 , the blue laser can be transmitted or reflected by the fluorescent chip 30, denoted as B(P+S), the first blue laser can pass forward through the DBEF 50 and be transmitted or reflected by the DBEF 50, and the first blue laser in the transmission part is denoted as B ( P), the first blue laser in the reflection part is denoted as B(S), the reflected blue laser can be transmitted by the fluorescent chip 30 and then enter the blue-transmitting anti-yellow filter 20, and is reflected by the blue-transmitting anti-yellow filter 20 Then, it is injected into the fluorescent chip 30, and the cycle is continued.

Through the cooperation of the blue and anti-yellow filter 20, the fluorescent chip 30 and the DBEF 50, the energy of the light source is fully utilized, so that when the light source enters the LCD panel, the light of three color bars of R, G and B corresponds to the LCD panel respectively. The color filter of the panel; the optical utilization efficiency of the whole system is high. After excitation by the blue laser, the beam combination of a certain polarization state and color corresponding to the color filter in the LCD panel is emitted from the DBEF 50. There will be no two-thirds of the energy loss when passing through the polarizer and the color filter, and almost no energy will be lost, which improves the energy utilization efficiency.

Please refer to FIGS. 8 to 10. FIG. 8 is a schematic structural diagram of the fourth embodiment of the projection display system provided by the present application. The difference from the embodiment shown in FIG. 6 is that the blue laser in this embodiment is linearly polarized light, which transmits The scattering area 313 is a transmissive area, and no corresponding microlenses are required to receive light.

The first microlens array 60 is disposed on the first side of the first wavelength conversion area 311 and the second wavelength conversion area 312, and is adapted to the first wavelength conversion area 311 and the second wavelength conversion area 312, that is, the first microlens The size of the array 60 matches the size of the wavelength conversion area (including the first wavelength conversion area 311 and the second wavelength conversion area 312), and the first microlens array 60 is only arranged in the area corresponding to the wavelength conversion area, which is the same as the transmission/scattering area. 313 has no overlapping area in the direction of the optical path; the second microlens array 70 is arranged on the second side opposite to the first side of the first wavelength conversion area 311 and the second wavelength conversion area 312, and is opposite to the first wavelength conversion area 311 And the second wavelength conversion area 312 is adapted, that is, the size of the second microlens array 70 matches the size of the wavelength conversion area, and the second microlens array 70 is only arranged in the area corresponding to the wavelength conversion area, which is different from the transmission/scattering area. 313 has no overlapping area in the optical path direction; the microlens array (including the first microlens array 60 and the second microlens array 70 ) can be a cylindrical microlens array.

The linearly polarized light enters the display device 40 through the blue-transmitting anti-yellow filter 20, the fluorescent chip 30 and the DBEF 50 in turn. It can directly pass through the area and pass through DBEF 50, reducing the energy loss caused by collecting Lambertian light or large-angle light.

The structure of the fluorescent chip 30 is shown in FIG. 9 . For most single LCD panels, the space of the red filter, green filter and blue filter corresponding to each pixel in the color filter in a certain direction Therefore, the wavelength conversion region of the fluorescent chip 30 can be in the shape of a long strip, and it is sufficient to ensure that it can correspond to each color filter in the color filter.

In a specific embodiment, the blue laser is P-polarized light, denoted as B(P), and the beam propagation is shown in FIG. 10 . In the first wavelength conversion region 311 of the chip 30, the P polarized light excites the red phosphor to generate red fluorescence, which is denoted as R(P+S), and the red fluorescence can pass forward through the DBEF 50 and be transmitted or reflected by the DBEF 50. The fluorescence (that is, the red fluorescence of the transmission part) is denoted as R(P), and the second red fluorescence (that is, the red fluorescence of the reflective part) is denoted as R(S), and the reflected red fluorescence can be scattered by the red phosphor into unpolarized light , the non-polarized light is reflected by the blue-transmitting anti-yellow filter 20 and then enters the first wavelength conversion area 311, and the cycle continues; in the second wavelength conversion area 312 of the fluorescent chip 30, the P-polarized light excites the green phosphor to generate green Fluorescence, denoted as G(P+S), green fluorescence can pass forward through DBEF 50 and be transmitted or reflected by DBEF 50, the first green fluorescence (ie the green fluorescence of the transmitted part) is denoted as G(P), the second green fluorescence (ie, the green fluorescence in the reflection part) is denoted as G(S), the reflected green fluorescence can be scattered by the green phosphor into unpolarized light, and the unpolarized light is reflected by the blue-transmitting and anti-yellow filter 20 and then enters the second The wavelength conversion area 312 continues to circulate; in the transmission area of the fluorescent chip 30, the P-polarized light directly passes through, and reaches the display device 40 through the DBEF 50.

It can be understood that, in order to further improve the energy utilization efficiency, corresponding microlenses may also be arranged in the transmission area.

This embodiment provides a high-efficiency, single-LCD panel projection display system. The polarized blue laser reaches the fluorescent chip 30 through a blue-reflecting lens, and excites the fluorescent powder in the area corresponding to the color filter to generate red Fluorescence and green fluorescence, and through partially polarized blue laser, red fluorescence and green fluorescence pass forward through DBEF 50, and part of the reflected polarized light is scattered by the phosphor to become unpolarized light, and the unpolarized light propagates backward through blue-transmitting light. The anti-yellow filter 20 is reflected by the blue-transmitting anti-yellow filter 20 and then scattered by the phosphor powder, and then reaches the DBEF 50, passing through part of the polarized light, and the other part of the light returns, and continues to circulate, so as to achieve higher energy Utilization efficiency, the energy utilization efficiency of the whole system is slightly higher than that of the embodiment shown in FIG. 6, and compared with the conventional single LCD system, the energy utilization efficiency is three times that; in addition, since there is no need to arrange microlenses on both sides of the scattering area , the number of units of the microlens can be reduced.

Please refer to FIG. 11 . FIG. 11 is a schematic structural diagram of a fifth embodiment of the projection display system provided by the present application. The difference from the embodiment shown in FIG. 6 is that the projection display system in this embodiment further includes a third microlens array 80 , the third microlens array 80 is disposed on the incident light path of the display device 40 , and the third microlens array 80 includes a plurality of microlenses 81 .

Each microlens 81 covers at least two sub-pixel regions in the pixel region (including the red sub-pixel region, the green sub-pixel region or the blue sub-pixel region), so as to perform face angle conversion on the light incident on the display device 40; specifically , since each microlens 81 covers at least two sub-pixels in the display area of the display device 40 , the incident light of the three colors (including red fluorescence, green fluorescence and blue laser light) separated from each other in angular space passes through the microlens 81 The surface angle conversion will be performed, that is, after passing through the microlens 81, the incident light separated in the angular space will be separated in the surface space, so that the light beams of different colors shine on the corresponding pixels, so as to avoid the TFT wires in the display panel 41. , so as to further effectively reduce the loss of light efficiency caused by the TFT wires, improve the utilization efficiency of light, and increase the maximum output brightness.

The above are only the embodiments of the present application, and are not intended to limit the scope of the patent of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present application, or directly or indirectly applied to other related technologies Fields are similarly included within the scope of patent protection of this application.

Claims

A projection display system, comprising:

a light-emitting component for generating laser light, the laser light includes a first laser light, a second laser light and a third laser light;

a light guide assembly, disposed on the transmission optical path of the laser light emitted by the light-emitting assembly, for controlling the transmission direction of the laser light and the light reflected to the light guide assembly;

a wavelength conversion device, which is arranged on the outgoing light path of the light guide assembly, and includes a first area and a second area, the first area includes a plurality of modules, and the plurality of modules includes a wavelength conversion area and a transmission/scattering area, Wherein, the wavelength conversion area is used for converting the first laser light irradiated to the wavelength conversion area into received laser light, and the transmission/scattering area is used for transmitting the second laser light irradiated to the transmission/scattering area, so that the The received laser light and the second laser light are transmitted out of the wavelength conversion device together, and the second region is used to reflect the third laser light irradiated to the second region to form recovered light and transmit it to the light a guide component, and after being reflected by the light guide component, it continues to enter the first area and the second area of the wavelength conversion device;

A display device, arranged on the outgoing light path of the wavelength conversion device, for receiving the received laser light and the second laser light, the display device includes a plurality of pixel regions, and the sub-pixel regions of the plurality of pixel regions are Sub-modules of a plurality of the modules are in one-to-one correspondence.
The projection display system according to claim 1, wherein,

The laser is a blue laser, the light guide component is a blue-transmitting anti-yellow filter, and the received laser includes red fluorescence and green fluorescence.
The projection display system according to claim 2, wherein:

Each of the pixel areas includes a red sub-pixel area, a green sub-pixel area and a blue sub-pixel area, the sub-module includes a first wavelength conversion area, a second wavelength conversion area and the transmission/scattering area, the red The sub-pixel region corresponds to the first wavelength conversion region, the green sub-pixel region corresponds to the second wavelength conversion region, and the blue sub-pixel region corresponds to the transmission/scattering region.
The projection display system according to claim 3, wherein the projection display system further comprises:

a first microlens array, arranged on the outgoing light path of the laser light, for collecting and collimating the laser light;

The second microlens array is arranged on the outgoing light path of the received laser light, and is used for collecting and collimating the received laser light.
The projection display system according to claim 4, wherein,

The projection display system further includes a reflective polarized brightness enhancement film, the reflective polarized brightness enhancement film is arranged on the outgoing light path of the wavelength conversion device, and is used to transmit the light having the first polarization output from the wavelength conversion device. and adjust the transmission direction of the first outgoing light to reflect the second outgoing light with a second polarization state to the wavelength conversion device, wherein the second outgoing light transmits the The wavelength conversion device reaches the light guide assembly, is reflected by the light guide assembly and then enters the wavelength conversion device again, forming a first outgoing light with a first polarization state and a second outgoing light with a second polarization state again After that, the re-formed first outgoing light is transmitted through the reflective polarized light-enhancing film and then incident on the display device, and the re-formed second outgoing light is reflected by the reflective polarized light-enhancing film to The recovered light is formed together with the third laser light reflected by the second region and transmitted to the light guide assembly.
The projection display system according to claim 5, wherein,

The blue laser light passes through the light guide assembly and the wavelength conversion device in sequence to reach the reflective polarized light enhancement film, and the first blue outgoing light with the first polarization state is transmitted through the reflective polarized light enhancement film To the display device, the second blue outgoing light having the second polarization state is reflected to the wavelength conversion device by the reflective polarized brightness enhancement film.
The projection display system according to claim 4, wherein,

The first microlens array and the second microlens array are disposed on both sides of the first wavelength conversion area, the second wavelength conversion area and the transmission/scattering area.
The projection display system according to claim 5, wherein,

The blue laser light is linearly polarized light, and the linearly polarized light enters the display device sequentially through the light guide assembly, the wavelength conversion device, and the reflective polarized brightness enhancement film.
The projection display system according to claim 8, wherein,

The first microlens array is arranged on the first side of the first wavelength conversion area and the second wavelength conversion area, and is adapted to the first wavelength conversion area and the second wavelength conversion area, The second microlens array is disposed on a second side opposite to the first side of the first wavelength conversion region and the second wavelength conversion region, and is opposite to the first wavelength conversion region and the second wavelength conversion area.
The projection display system according to claim 3, wherein,

The first wavelength conversion area, the second wavelength conversion area and the transmission/scattering area are elongated.
The projection display system according to claim 1, wherein the display device comprises:

a polarizer, arranged on the outgoing light path of the wavelength conversion device, and used for obtaining light having a first polarization state from the light emitted by the wavelength conversion device;

a display panel, arranged on the outgoing light path of the polarizer, for receiving the light emitted by the polarizer;

The analyzer is arranged on the outgoing light path of the display panel, and is used for converting the light outgoing from the display panel into image light.
The projection display system according to claim 1, wherein,

The projection display system further includes a third microlens array, which is disposed on the incident light path of the display device and includes a plurality of microlenses, each of which covers at least the pixel area The two sub-pixel regions are used to convert the surface angle of the light incident on the display device.