WO2022127544A1

WO2022127544A1 - Light modulator and projection display system

Info

Publication number: WO2022127544A1
Application number: PCT/CN2021/132906
Authority: WO
Inventors: 胡飞; 张翠萍; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2020-12-18
Filing date: 2021-11-24
Publication date: 2022-06-23
Also published as: CN114647137A

Abstract

A light modulator (10) and a projection display system. The light modulator (10) comprises a surface-angle conversion assembly (11) and a modulation assembly (12). The surface-angle conversion assembly (11) is used for performing surface-angle conversion and converging on multiple light source beams to form multiple convergent beams corresponding to the light source beams, the multiple convergent beams being separated in an angle space. The modulation assembly (12) is used for modulating the multiple convergent beams to form image light; and the modulation assembly (12) comprises multiple pixel units (121); each pixel unit (121) comprises at least three sub-pixels; and the convergent beams respectively enter sub-pixels of the pixel units, and are in one-to-one correspondence with the sub-pixels. The surface-angle conversion assembly (11) comprises a microlens array consisting of multiple microlenses, each microlens being matched with the position of at least one pixel unit to converge the convergent beams to the pixel units (121). The method above can improve the light efficiency, and the present invention is simple in structure and small in volume.

Description

A light modulator and projection display system

technical field

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

Background technique

The projection display system mainly includes light source, lighting system, opto-mechanical system and projection lens. Spatial Light Modulator (SLM) is an important device in the opto-mechanical system, which can be realized by regulating the luminous flux of independent pixels. Pixelated image display. SLMs commonly used in modern projection display systems do not have wavelength selectivity for visible light, and include reflective digital micromirror devices (DMDs) based on Micro-Electro-Mechanical System (MEMS) technology, reflective Liquid Crystal on Silicon (LCoS) and transmissive liquid crystal displays (LCD, Liquid Crystal Display) are commonly used for display at present, but they have large volume, poor display effect, short life of LCD display chips and The problem of large light loss and so on.

SUMMARY OF THE INVENTION

The present application provides a light modulator and a projection display system, which can improve light efficiency, and have a simple structure and a small volume.

In order to solve the above-mentioned technical problems, the technical solution adopted in this application is to provide a light modulator, the light modulator includes: a face angle conversion assembly and a modulation assembly, and the face angle conversion assembly is arranged on the outgoing optical path of the multiple light source beams, It is used to convert and converge multiple light source beams to form multiple convergent beams corresponding to the light source beams, wherein each light source beam is separated in surface space, and multiple convergent beams are separated in angular space; the modulation component is arranged on the surface The outgoing light path of the angle conversion component is integrally arranged with the face angle conversion component, and is used to modulate multiple convergent light beams to form image light; wherein the modulation component includes a plurality of pixel units, and each pixel unit includes at least three There are sub-pixels, each condensed beam is incident on the sub-pixels in the pixel unit respectively, and the condensed beams correspond to the sub-pixels one-to-one, and at least three sub-pixels include red sub-pixels, green sub-pixels or supplementary sub-pixels; the face angle conversion component includes a A microlens array composed of a plurality of microlenses, each of which is matched with the position of at least one pixel unit.

In order to solve the above technical problems, another technical solution adopted in the present application is to provide a projection display system, the projection display system includes: a light-emitting component and a light modulator, the light-emitting component is used to generate multiple light beams of light sources; On the outgoing optical paths of the multiple light source light beams, the light modulator is used for modulating the multiple light source light beams, and the light modulator is the above-mentioned light modulator.

Through the above solution, the beneficial effects of the present application are as follows: the present application proposes a solution for matching the face angle conversion assembly on the adjustment assembly, using the face angle conversion assembly to receive multiple light source beams, and the face angle conversion assembly includes a plurality of microlenses , each microlens can perform surface angle conversion processing on the incident light source beam to obtain a convergent beam corresponding to the light source beam, and inject multiple convergent beams into the modulation component, and the modulation component is arranged on the outgoing light of the surface angle conversion component On the road, and integrally arranged with the face angle conversion assembly, it can ensure the accuracy of the cooperation between the face angle conversion assembly and the modulation assembly and the structural stability of the integrated light modulator. At the same time, the modulation assembly includes a plurality of pixel units, a micro The lens may correspond to the position of at least one pixel unit, and input the beam converted by the face angle to the corresponding pixel unit, thereby generating colored light. Through a face angle conversion component, the angular space-separated light source beams of different colors can be converted into surface-space-separated converging beams that enter the modulation component at different incident angles, so as to realize the separation of spatial pixel positions. The structure is relatively simple, and The volume is small; and because the microlens array is used as the surface angle conversion component, on the one hand, the light efficiency loss caused by the opaque structure in the LCD panel is improved through the regulation of the light beam by the microlens array, and the LCD panel is improved. On the other hand, the color pixel separation can be realized by using the microlens array itself, without using the color filter film for pixel separation, which avoids the loss of light efficiency caused by the color filter film, and improves the utilization of light efficiency. , and also reduces the thermal load of the LCD panel, and improves the display effect and reliability.

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:

1 is a schematic structural diagram of an embodiment of an optical modulator provided by the present application;

FIG. 2 is a schematic structural diagram of a pixel unit in the embodiment shown in FIG. 1;

Fig. 3 (a) is the three-dimensional structure schematic diagram of the face angle conversion assembly in the embodiment shown in Fig. 1;

Fig. 3 (b) is another three-dimensional structural schematic diagram of the face angle conversion assembly in the embodiment shown in Fig. 1;

Figure 4 is a schematic cross-sectional structure diagram of the face angle conversion assembly in Figure 3(b);

FIG. 5 is a schematic diagram of different light source beams irradiating on sub-pixels through the face angle conversion assembly in FIG. 3;

Fig. 6 is the schematic diagram of the sub-pixel arrangement corresponding to Fig. 5;

FIG. 7 is another schematic diagram of different light source beams irradiating on sub-pixels through the face angle conversion assembly in FIG. 3;

Fig. 8 is the schematic diagram of the sub-pixel arrangement corresponding to Fig. 7;

Fig. 9 is another three-dimensional structural schematic diagram of the face angle conversion assembly in the embodiment shown in Fig. 1;

FIG. 10 is a schematic diagram of different light source beams irradiating on sub-pixels through the face angle conversion component in FIG. 9;

Fig. 11 is another three-dimensional structural schematic diagram of the face angle conversion assembly in the embodiment shown in Fig. 1;

Fig. 12(a) is a schematic structural diagram of the sub-pixel in the face angle conversion component and the pixel unit shown in Fig. 11;

Fig. 12(b) is another structural schematic diagram of the sub-pixel in the face angle conversion component and the pixel unit shown in Fig. 11;

Fig. 12(c) is another structural schematic diagram of the sub-pixel in the face angle conversion component and the pixel unit shown in Fig. 11;

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

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

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

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

FIG. 17 is a schematic structural diagram of the light-emitting assembly in the embodiment shown in FIG. 16;

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

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

FIG. 20 is a schematic structural diagram of the wavelength conversion assembly in the embodiment shown in FIG. 19;

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

FIG. 22 is a schematic structural diagram of an eighth 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.

In the display system, the core principle of display is to use red, green, and blue three primary colors for display, that is, it is necessary to display the image display information of red, green and blue three primary colors through SLM, and then integrate the three primary colors through time integration or space integration. The combination of primary color image information enables the human eye to observe full-color image information. Different display systems use different methods to achieve three primary color display.

At present, the single-chip color liquid crystal screen LCD display chip is often used in the projection system as a spatial light modulator, which maintains the advantages of the single-chip SLM projection system with a simple structure, low cost, and avoids the rainbow effect. However, this solution It will cause a large amount of light energy loss (more than 60%), affect the display effect and the life of the display chip, and cannot take into account portability and large light transmittance.

In order to solve the problem of low utilization of light efficiency caused by light blocking by structures such as color filter films and TFT circuits in existing LCDs, this solution can convert light beams with different incident angles into convergent light beams with different spatial positions through the face angle conversion component. , respectively irradiating on the corresponding sub-pixels, the color filter film can no longer be used, which helps to increase the utilization rate of light efficiency. And each microlens in the face angle conversion assembly can be matched with a pixel unit including at least three sub-pixels (ie, red sub-pixels, green sub-pixels, blue sub-pixels or supplementary sub-pixels), and the color of the supplementary sub-pixels can be matched. Setting according to specific application scenarios can fully meet diverse application requirements. The optical modulator of the present application will be introduced in detail below.

Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of an embodiment of an optical modulator provided by the present application. The optical modulator 10 includes a face angle conversion component 11 and a modulation component 12 .

The face angle conversion component 11 is arranged on the outgoing light path of the multiple light source beams, and is used to perform face angle conversion and convergence on the multiple light source beams to form multiple convergent beams corresponding to the light source beams; specifically, the multiple light source beams can be Including red light beams, green light beams and blue light beams, the face angle conversion component 11 includes a microlens array composed of a plurality of microlenses, each light source beam is separated in angular space, and the light source beam and the condensing beam are in one-to-one correspondence. In the example, multiple convergent beams are spaced apart in the plane.

The modulation component 12 is arranged on the outgoing light path of the face angle conversion component 11, and is integrally arranged with the face angle conversion component 11. It is used to modulate multiple convergent light beams to form image light. The modulation component 12 can be an LCD, a liquid crystal Devices with beam modulation function such as silicon display LCOS or digital mirror component DMD are attached.

Further, as shown in FIG. 2 , the modulation component 12 includes a plurality of pixel units 121, each pixel unit 121 includes at least three sub-pixels, each convergent light beam is incident on the sub-pixels in the pixel unit 121 respectively, and the converged light beam and the sub-pixels are respectively incident. Pixels are in one-to-one correspondence, and each microlens is matched with the position of at least one pixel unit 121 to condense the condensed light beam on the pixel unit, thereby maximizing the light modulation efficiency of the modulation component; specifically, at least three The sub-pixels may include red sub-pixels, green sub-pixels, blue sub-pixels or supplementary sub-pixels. The number and type of sub-pixels included in each pixel unit 121 can be set according to specific needs. The arrangement of sub-pixels not only It can be the currently commonly used three sub-pixels arranged side by side, or four sub-pixels or more than four sub-pixels can be arranged side by side, or two-dimensionally arranged in a 2×2 manner, which is not limited in this embodiment. For example, as shown in FIG. 2, the number of sub-pixels in each pixel unit 121 is 4, which are denoted as 121a-121d respectively, and they can be the first red sub-pixel, the second red sub-pixel, the green sub-pixel and the blue sub-pixel The sub-pixel, that is, the supplementary sub-pixel is the second red sub-pixel.

In a specific embodiment, as shown in FIGS. 3( a )- 3 ( b ) and 4 , the light modulator 10 further includes a glass sheet 13 , and the glass sheet 13 is arranged between the face angle conversion component 11 and the modulation component 12 . Between the three sub-pixels, the three are arranged together, which can further ensure the accuracy of the surface angle conversion component and the modulation component and the structural stability of the integrated light modulator. At the same time, at least three sub-pixels are arranged in the row direction/column direction. is a one-dimensional cylindrical microlens array, as shown in Figure 3(a), or the microlens array is a two-dimensional square microlens array, as shown in Figure 3(b); wherein, the cylindrical microlens array includes multiple rows of microlenses, When at least three sub-pixels in each pixel unit 121 are arranged in a column direction, each column of microlenses corresponds to one column of pixel units 121, that is, each column of pixel units 121 is matched with one cylindrical microlens, and the entire modulation component 12 is matched with a one-dimensional arrangement Similarly, when at least three sub-pixels in each pixel unit 121 are arranged in a row direction, each row of microlenses corresponds to a row of pixel units 121 .

In one embodiment, the modulation component 12 is an LCD panel. As shown in FIG. 5 , the three light source light beams 201a-203a or the three light source light beams 201b-203b can be incident on the microlens array on the LCD panel from different angles. The lens array can condense the three light source beams 201-203 (including 201a-203a and 201b-203b) with different incident angles to the positions of the three different sub-pixels 121a-121c respectively, realizing the spatial utilization of three sub-pixels Display different colors to get the effect of color display.

The arrangement of the sub-pixels in each pixel unit 121 can be shown in FIG. 6 , that is, each pixel unit 121 includes three sub-pixels 121a-121c, and the three sub-pixels 121a-121c are arranged side by side in a line, which can be used for the corresponding light source. The light beam is regulated and displayed for brightness.

In another embodiment, four sub-pixels or more sub-pixels can be set in one pixel unit 121. This embodiment mainly describes the case where one pixel unit 121 includes four vertical strip-shaped sub-pixels, that is, each pixel unit The number of sub-pixels included in 121 is four.

As shown in FIG. 7 and FIG. 8 , the modulation element 12 includes four sub-pixels: 121a, 121b, 121c and 121d. The sub-pixels 121a-121d can be arranged in the row direction, and their corresponding colors are denoted as A, B, C and D respectively. , A-D can be any color, and different options can be used according to different application scenarios. For example, for wide color gamut display, at least three sub-pixels include a first red sub-pixel, a second red sub-pixel, a green sub-pixel and a blue sub-pixel. Pixels can be arranged in RRGB, and A-D represent red (R, Red), red, green (G, Green), and blue (B, Blue) respectively; for scenes with high brightness requirements, RGGB or RGBY can be used. Arrangement, etc., that is, at least three sub-pixels include red sub-pixels, first green sub-pixels, second green sub-pixels, and blue sub-pixels, A-D represent red, green, green, and blue, respectively, or at least three sub-pixels include red. Sub-pixels, green sub-images, blue sub-pixels, and yellow sub-pixels, A-D are red, green, blue, and yellow (Y, Yellow), respectively.

The beams separated in angular space are input to the cylindrical microlens array for face angle conversion, and after passing through the cylindrical microlens, the beams separated in angular space are separated in face space. Specifically, as shown in FIG. 7 , the light source beam 211a and the light source beam 211b are incident at a specific angle, and after passing through the cylindrical microlens, they reach the position of the sub-pixel 121a; similarly, the light source beams 212a-212b reach the position of the sub-pixel 121b. , the light source beams 213a-103b reach the position of the sub-pixel 121c, and the light source beams 214a-214b reach the position of the sub-pixel 121d, so that the four light source beams can be separated in space by the cylindrical microlens, thereby avoiding the horizontal TFT wires on the top, improving the efficiency of the light beam passing through the LCD panel. In addition, since light of different colors (either single wavelength or broad spectrum) can accurately reach specific sub-pixels through the cylindrical microlens, the loss when passing through the color filter film in the LCD panel can be minimized, and even no The color filter film is further arranged, thereby increasing the maximum output brightness and reducing the heat on the LCD panel, thereby improving the reliability of the LCD panel and helping to prolong the service life.

In another specific embodiment, as shown in FIG. 9 , the microlens array is a two-dimensional microlens array, that is, a two-dimensional microlens array is matched on the modulation component 12, and the two-dimensional microlens array includes a plurality of microlenses, The microlenses are in one-to-one correspondence with the pixel units 121 .

Each microlens can cover 2×2 sub-pixels. As shown in FIG. 10 , four light source

light beams

221 a , 222 a , 221 b and 222 b are irradiated on the face angle conversion assembly 11 , along the direction of the microlens in the face angle conversion assembly 11 . The light source light beams 221a-221b and 222a-222b incident in different directions on the diagonal plane are condensed by the microlenses to the sub-pixel 121c and the sub-pixel 121a respectively due to different incident angles. Likewise, two light beams with different angles incident along the other diagonal plane of the microlens can be condensed to the sub-pixel 121b and the sub-pixel 121d. That is, after light beams of different angles pass through a microlens, they can be spatially separated and irradiated on the four sub-pixels 121a-121d respectively, so as to realize 2×2 sub-pixel display.

In a specific embodiment, as shown in FIG. 11 , the face angle conversion device 11 includes a plurality of microlenses 111 , the shape of the microlenses 111 is a hexagon, and each microlens 111 covers a pixel unit 121 , and the pixel unit 121 Several sub-pixels are included, for example, the number of at least three sub-pixels in the pixel unit 121 is four to seven, and the distribution of the sub-pixels can adopt various designs to meet application requirements of multiple scenarios.

At least three sub-pixels in each pixel unit 121 may be arranged in a column direction, a row direction or a circumferential direction. For example, as shown in FIG. 12( a ), the pixel unit 121 includes four sub-pixels 121 a - 121 d -121d can be arranged in a column direction, each hexagonal microlens 111 covers four sub-pixels 121a-121d, and the colors of the four sub-pixels 121a-121d can be RRGB, RGGB or RGBY; or as shown in Figure 12(b) As shown, the pixel unit 121 includes six sub-pixels 121a-121f, the six sub-pixels 121a-121f are arranged in the circumferential direction of the column, each hexagonal microlens 111 covers the six sub-pixels 121a-121f, the six sub-pixels 121a-121f The colors can be RGBRGB, RRRGGB or RRGGGB, and the wavelengths corresponding to the same color can be the same or the same color can be located in different wavelength bands; or as shown in FIG. 12(c), the pixel unit 121 includes seven sub-pixels 121a-121g, six sub-pixels 121a-121g, The pixels 121a-121f are arranged in the circumferential direction of the column virtual circle, the remaining sub-pixels 121g are arranged at the center of the virtual circle, and each hexagonal microlens 111 covers the seven sub-pixels 121a-121g, and the Color can be RRRGGBB.

This embodiment provides a light modulator 10, which directly converts the light beams of different light sources separated by surface space into light beams of different colors separated by angular space through a surface angle conversion component 11, and irradiated on the modulation component 12; One column of pixel units 121 matches the structure of one cylindrical microlens or one pixel unit 121 matches the structure of one two-dimensional microlens, that is, the entire modulation component 12 matches the cylindrical microlens array or the two-dimensional microlens array. Since the light beams of different colors have been separated in angular space, resulting in different angles incident on the modulation component 12, they are converted into spatially separated beams by the modulation component 12, and then irradiated on the sub-pixels of different colors. By using space integration as a pixel unit 121, full-color display can be realized; and because only one surface angle conversion component 11 is used to realize the conversion of the light source beam from angular space to surface space, the structure is simple. In addition, since the microlens array is used as the surface angle conversion component 11, on the one hand, the control effect of the microlens array on the light beam improves the light-tight structure (such as TFT circuit or black film, etc.) in the LCD panel. The loss of light efficiency improves the equivalent aperture ratio of the LCD panel and increases the maximum output brightness. The utilization rate of light efficiency is improved, the heat load of the LCD panel is also reduced, and the display effect and reliability are improved.

Please refer to FIG. 13. FIG. 13 is a schematic structural diagram of the first embodiment of the projection display system provided by the present application. The projection display system includes: a light modulator 10 and a light-emitting component 30, and the light-emitting component 30 is used to generate multiple light source beams; light modulation The device 10 is arranged on the outgoing optical path of the multiple light source beams, the light modulator 10 is used for modulating the multiple light source beams, and the light modulator 10 adopts the light modulator in the above-mentioned embodiment.

The projection display system further includes a first lens assembly 40, the first lens assembly 40 is disposed on the outgoing light path of the light-emitting assembly 30, and the first lens assembly 40 is used for converting multiple light source light beams, so that each light source light beam has a different value. The incident angle is incident on the light modulator 10; specifically, the light emitting component 30 is disposed near the front focal plane of the first lens component 40, and the first lens component 40 may be a face angle conversion lens.

In a specific embodiment, please refer to FIG. 14. FIG. 14 is a schematic structural diagram of the second embodiment of the projection display system provided by the present application. The light-emitting component 30 includes: a red light source 301, a green light source 302, and a blue light source 303, The multiple light source beams include red light beams, green light beams and blue light beams.

The red light source 301 is used to generate the red light beam; the green light source 302 is used to generate the green light beam; the blue light source 303 is used to generate the blue light beam, and the red light source 301, the green light source 302 and the blue light source 303 are all arranged on the first lens Near the front focal plane of the component 40; specifically, the red light source 301, the green light source 302 and the blue light source 303 can be light emitting diode (LED, Light Emitting Diode) light sources, and the first lens component 40 can be a lens or a lens group.

Further, as shown in FIG. 14 , three different color LED light sources of red LED, green LED and blue LED are used as the light-emitting component 30, and they are placed near the front focal plane of the first lens component 40, The face angle conversion function of the lens assembly 40 directly converts the three light beams into

light beams

231R, 231G, and 231B of different angles. On the LCD panel, the subsequent working principle is the same as the working principle of the light modulator 10 in the above-mentioned embodiment, which will not be repeated here.

In other embodiments, the light-emitting component 30 may further include a supplementary light source (not shown in the figure), the supplementary light source is used to generate a supplementary light beam, and the supplementary light beam is used to improve the luminous brightness or color gamut of the light-emitting component 30, and the supplementary light source is also arranged in the Near the front focal plane of the first lens assembly 40, that is, the multiple light source beams are red light beams, green light beams, blue light beams and supplementary light beams, there are four light source light beams in total, and the colors of the supplementary light beams can be red, green, blue , yellow or white, the working principle is similar to that of the three light source beams, and will not be repeated here.

In this embodiment, light sources of different colors are used to convert the surface angle through a first lens assembly 40, and the light beams of the light sources are directly irradiated on the LCD panel matched with the microlens array at different angles, thereby achieving high light efficiency utilization, simple structure and low cost. lower.

In another specific embodiment, please refer to FIG. 15. FIG. 15 is a schematic structural diagram of the third embodiment of the projection display system provided by the present application. The difference from the second embodiment is that the projection display system in this embodiment further includes: The scattering component 50 is arranged on the outgoing light path of the light-emitting component 30 . The scattering component 50 is used to scatter multiple light source beams to form multiple scattered beams, and the light spot of the scattered beam is located at the front focus of the first lens component 40 . near the face.

Further, the scattering assembly 50 includes three scattering devices 51-53; the red light source 301, the green light source 302 and the blue light source 303 are respectively laser light sources, and the red light source 301, the green light source 302 and the blue light source 303 emit three-color quasi-chromatic light sources. The straight beams are converted into scattered beams through the corresponding scattering devices 51-53 respectively. Since the light spots of the scattered beams are located near the front focal plane of the lens or lens group, the scattered beams with different positions on the front focal plane are converted after passing through the lens or lens group. are

light beams

232R, 232G, and 232B with different angles. The three light beams are incident on the LCD panel matched with the microlens array at different angles. The subsequent working principle is the same as the working principle of the light modulator 10 in the above-mentioned embodiment. To repeat; finally, high light efficiency utilization rate is realized, and the structure is simple and cost-effective.

In another specific embodiment, please refer to FIG. 16 and FIG. 17 . FIG. 16 is a schematic structural diagram of the fourth embodiment of the projection display system provided by the present application. The devices 311-314 may be arranged in a two-dimensional matrix, and the four light-emitting devices 311-314 may be solid light sources, and the solid light sources may be LEDs or phosphors that generate fluorescence after being excited.

Further, the light-emitting colors of the four light-emitting devices 311-314 at different angles can be any color, and different options can be used according to different application scenarios. For example, for wide color gamut display, RRGB can be used; for high brightness requirements In the scene, RGGB or RGBY can be used.

As shown in FIG. 16 , the projection display system further includes: a second lens assembly 60 , a third lens assembly 70 and a first uniform light device group 80 .

The second lens assembly 60 is disposed on the outgoing light paths of the four light-emitting devices 311-314, and is used for shaping the four light beams of the light source. The second lens assembly 60 may be a lens or a lens group.

The third lens assembly 70 is disposed on the outgoing light path of the second lens assembly 60 , and is used for condensing the light beams emitted from the second lens assembly 60 .

The first homogenizing device group 80 is disposed on the outgoing light path of the third lens assembly 70 , and is used for homogenizing the light beam emitted from the third lens assembly 70 .

The working principle of the projection display system is as follows: the light-emitting device 311 and the light-emitting device 312 emit light beams, which are shaped into

parallel beams

241a and 241b through the second lens assembly 60, and then pass through a third lens assembly 70 to form condensed beams and enter the first uniform beam respectively. In the optical device group 80, the uniform light beam emitted from the first uniform light device group 80 becomes two light beams with different angles through the first lens assembly 40, and the two light beams are irradiated on the modulation assembly 12. The subsequent working principle is the same as the above-mentioned embodiment. The working principle of the medium light modulator 10 is the same, which is not repeated here.

In another specific embodiment, please refer to FIG. 18 . FIG. 18 is a schematic structural diagram of the fifth embodiment of the projection display system provided by the present application. The light-emitting component 30 includes a white light source 321 , a fourth lens component 322 and a wavelength selection component 323 .

The white light source 321 is used to generate a white light beam with a certain divergence angle, and the white light source 321 includes a combination of a white light LED or a laser and a phosphor powder that generates white light after being excited.

The fourth lens component 322 is disposed on the optical path of the white light beam, and is used for condensing the white light beam. The fourth lens component 322 may be a lens or a lens group.

The wavelength selection component 323 is disposed on the outgoing light path of the fourth lens component 322 , and is used for receiving the light beam emitted by the fourth lens component 322 to generate red light beam, green light beam and blue light beam, and enter the first lens component 40 .

Further, the wavelength selection component 323 includes a first dichroic plate 3231, a second dichroic plate 3232 and a third dichroic plate 3233. The three dichroic plates 3231-3233 have different color selections, and different dichroic plates can be used. coating design, so that the first dichroic plate 3231, the second dichroic plate 3232 and the third dichroic plate 3233 can reflect R, G and B respectively, or reflect B, G and R respectively, or reflect G , B, and R color beams.

Specifically, the first dichroic plate 3231 is used for reflecting the green light component in the white light beam to emit the green light beam; the second dichroic plate 3232 is used for reflecting the red light component in the white light beam to emit the red light beam The third dichroic plate 3233 is used to reflect the blue light component in the white light beam to emit the blue light beam; that is, the white light beam is first reflected in the first dichroic plate 3231, and the first dichroic plate 3231 is provided with a special coating, The green component in the white light beam can be reflected to the first lens assembly 40, and the light beams of other colors can pass through the first dichroic plate 3231; the light beams of other colors are reflected by the second dichroic plate 3232, and the second The dichroic plate 3232 is provided with a special coating, so that the red component of the light beams of other colors is reflected to the first lens assembly 40, and the remaining blue component is transmitted through the second dichroic plate 3232; The specially coated third dichroic plate 3233 is reflected and reaches the first lens assembly 40 .

The working principle is: the white light beam passes through the fourth lens assembly 322 to form a convergent beam, which can form a very small image, and three different dichroic films 3231-3233 are placed near the small image. The wavelength selectivity of 3233 is different and the placement angle is different, so that the light beam emitted by the white light source 321 forms a small-sized image of three different colors separated by surface space, which can be used as the light source beam 251R of different colors separated by surface space in the subsequent optical path. , 251G, 251B, the three light source beams 251R, 251G, 251B are located near the front focal plane of the first lens assembly 40, through the action of the first lens assembly 40, three

convergent beams

252R, 252G, 252B with different angles are formed to Different angles are irradiated on the light modulator 10 matched with the microlens array, and the subsequent working principle is the same as the working principle of the light modulator 10 in the above-mentioned embodiment, which is not repeated here.

In other embodiments, the multiple light source light beams further include supplementary light beams, there are four light source light beams in total, and the wavelength selection component 323 is configured to receive the light beams emitted by the fourth lens component 322 to generate red light beams, green light beams, blue light beams and The supplementary light beam is injected into the first lens assembly 40; the wavelength selection assembly 323 includes a first dichroic plate 3231, a second dichroic plate 3232, a third dichroic plate 3233 and a fourth dichroic plate (Fig. Not shown), the fourth dichroic plate is used to reflect the component of the white light beam with the same wavelength as the supplementary light beam to emit the supplementary light beam; its working principle is similar to that of the three light source beams, and will not be repeated here.

In this embodiment, through the function of the fourth lens assembly 322 to condense light beams, the white light source 321 is equivalently formed into three colored light sources of different colors separated in surface space through three dichroic sheets 3231-3233 with different angles. The separated and separated color light-emitting sources are then converted into light source beams of different angles through the first lens assembly 40, and irradiated on the light modulator 10 matched with the microlens array at different angles to form a full-color display. Due to the use of the fourth lens assembly 322, the white light source 321 forms a color light source with a smaller size at the three dichroic plates 3231-3233, which makes the size of the projection display system smaller, and avoids the dichroism caused by the traditional telecentric light path. The larger size of the color chips reduces the overall size of the projection display system. In addition, three dichroic sheets 3231-3233 can be used to select light beams of different colors without sacrificing light efficiency, that is, the light utilization efficiency of the system is improved; at the same time, because the microlenses have a certain convergence effect, the LCD panel is avoided. The shading of the middle TFT circuit further improves the light efficiency.

In another specific embodiment, please refer to FIG. 19. FIG. 19 is a schematic structural diagram of the sixth embodiment of the projection display system provided by the present application. The light-emitting component 30 includes: a blue laser 331, a selective reflection device 332, and a fifth lens The component 333 , the wavelength conversion device 334 , the sixth lens component 335 and the second uniform light device group 336 .

The blue laser 331 is used to generate three blue laser beams with different angles, and the selective reflection device 332 is arranged on the outgoing optical path of the blue laser beam, which is used to reflect the blue laser beam, and the selective reflection device 332 can be Dichroic chips.

The fifth lens assembly 333 is disposed on the outgoing optical path of the blue laser beam, and is used for condensing the blue laser beam reflected by the selective reflection device 332 .

The wavelength conversion device 334 is arranged on the outgoing light path of the blue laser beam, and is used for receiving the blue laser beam reflected by the selective reflection device 332, and generates a red light beam, a green light beam and a blue light beam, and a red light beam and a green light beam. And the blue light beam becomes three collimated light beams with different colors separated by beam angles after passing through the fifth lens component 333 .

Further, the red light beam is red fluorescent light, and the green light beam is green fluorescent light. As shown in FIG. 20 , the wavelength conversion device 334 includes three red light areas 3341 , green light areas 3342 and blue light areas 3343 arranged at the same center. The region 3341 is provided with a red light wavelength conversion material, the red light wavelength conversion material is used to receive a blue laser beam and generate red fluorescence, and the red light wavelength conversion material can be red fluorescent powder; the green light region 3342 is provided with a green light wavelength conversion material, The green light wavelength conversion material is used to receive the blue laser beam to generate green fluorescence, and the green light wavelength conversion material can be green phosphor; the blue light region 3343 is provided with a scattering sheet, which is used for scattering the blue laser beam. Specifically, as shown in FIG. 20 , the red light region 3341, the green light region 3342 and the blue light region 3343 are arranged at different radii of the wavelength conversion device 334, and red phosphors, green phosphors and scattering sheets are respectively arranged from outside to inside , it can be understood that the regions of each phosphor circle in FIG. 20 are only shown schematically, and those skilled in the art can arrange them arbitrarily as required.

The sixth lens assembly 335 is disposed on the outgoing light paths of the three collimated light beams with different colors, and is used for condensing the three collimated light beams with different colors.

The second light homogenizing device group 336 is disposed on the outgoing light path of the sixth lens assembly 335 , and is used for homogenizing the light beam emitted by the sixth lens assembly 335 .

The working principle is as follows: the blue laser 331 emits a blue laser beam 261 of different angles, which is appropriately shaped, and irradiates the red light region 3341, green light region 3342 and blue light region 3343 of the wavelength conversion device 334 through the selective reflection device 332, respectively. The red, green and blue Lambertian light sources are formed, and then the fifth lens assembly 333 becomes three

collimated beams

261R, 261G, 261B separated by three beam angles. The collimated light beams 261R, 261G, and 261B separated by the three beam angles pass through the selective reflection device 332, and then enter the second homogenizing device group 336 through the converging action of the sixth lens assembly 335; The outgoing light source light beams of different colors are located on the front focal plane of the first lens assembly 40, so the light source light beams of different colors and different surface space positions are converted into angularly separated light beams by the first lens assembly 40, and are irradiated to the matching microscopic light beams. On the LCD panel of the lens array, the subsequent working principle is the same as the working principle of the light modulator 10 in the above-mentioned embodiment, which will not be repeated here.

In other embodiments, the multiple light source beams further include supplementary beams, there are four light source beams in total, and the wavelength conversion device 334 is used to receive the blue laser beam reflected by the selective reflection device 332 to generate red light beams, green light beams, The blue light beam and the supplementary light beam, the red light beam, the green light beam and the supplementary light beam are respectively red fluorescence, green fluorescence and supplementary fluorescence; The collimated light beams separated by beam angle space; the sixth lens assembly 335 can condense the four collimated light beams; the wavelength conversion device 334 includes four red light regions 3341, green light regions 3342, blue light regions 3343 and In the supplementary area (not shown in the figure), the red light area 3341 is provided with a red light wavelength conversion material, and the red light wavelength conversion material is used to receive a blue laser beam to generate red fluorescence, and the red light wavelength conversion material can be red phosphor; The green light region 3342 is provided with a green light wavelength conversion material, the green light wavelength conversion material is used to receive a blue laser beam and generate green fluorescence, and the green light wavelength conversion material can be green phosphor powder; the blue light region 3343 is provided with a scattering sheet, the scattering sheet It is used to scatter the blue laser beam; the supplementary area is provided with a supplementary wavelength conversion material, which can receive the blue laser beam and generate supplementary fluorescence; its working principle is similar to that of the three light source beams, and will not be repeated here.

This embodiment describes a method of exciting phosphors or scattering sheets at different positions and colors by blue laser beams to form light-emitting light sources of different colors with surface space separation, and then performing surface angle conversion through the first lens assembly 40, and finally Light beams of different colors are irradiated on the LCD panel at different incident angles to realize spatial integration display; the wavelength conversion device 334 is equipped with red phosphors and green phosphors, which can be excited by the blue laser beam when the wavelength conversion device 334 rotates , produce red fluorescence and green fluorescence, which can effectively reduce the load in the fixed area, avoid the thermal quenching effect of the phosphor, increase the luminous intensity, and realize a projection display solution with high brightness, high light efficiency, simple structure and high cost performance. .

In another specific embodiment, please refer to FIG. 21. FIG. 21 is a schematic structural diagram of the seventh embodiment of the projection display system provided by the present application. The light-emitting component 30 can be the light-emitting component in the above-mentioned embodiment, and its working principle is the same as the above-mentioned The embodiment is the same and will not be repeated here; the modulation component 12 is a DMD, as shown in FIG. 21 , the projection display system further includes a reflection device 90 and a total internal reflection device 100, and the reflection device 90 is arranged on the optical path of the multiple light source beams, The reflection device 90 is used to reflect the multiple light source beams to the total internal reflection device 100, and the total internal reflection device 100 is used to reflect the multiple light source beams to the DMD, and transmit the reflected beams modulated by the DMD to the subsequent optical system.

The light-emitting assembly 30 emits light source beams 271R, 271G, and 271B of different angles and colors, and after passing through the reflective device 90 and the total internal reflection device 100 in sequence, they are irradiated on the DMD matched with the microlens array. The subsequent working principle is the same as that in the above embodiment. The working principle of the light modulator 10 is similar, and details are not repeated here.

In other specific embodiments, please refer to FIG. 22. FIG. 22 is a schematic structural diagram of the eighth embodiment of the projection display system provided by the present application. The light-emitting component 30 may be the light-emitting component in the above-mentioned embodiment, and its working principle is the same as that of the above-mentioned embodiment. The modulation component 12 is LCoS, as shown in FIG. 22 , the projection display system further includes a polarization beam splitting device 110, and the polarization beam splitting device 110 is arranged on the optical path of the multiple light source beams, which is used for multiple The light source beam is processed and the processed light beam is injected into the LCoS, and the light beam reflected by the LCoS modulation is transmitted to the subsequent optical system.

The light-emitting assembly 30 generates light source beams 281R, 281G, and 281B of different angles and colors. After the three light source beams 281R, 281G, and 281B pass through the polarization beam splitting device 110, they are irradiated onto the LCoS matched with the microlens array. The subsequent working principle is the same as the above. The working principle of the light modulator 10 in the embodiment is similar, and details are not repeated here.

The present application provides a spatial integral projection solution with high light efficiency utilization, simple structure and low cost, which can realize high-performance projection display effect in a low-cost manner, and can be applied to various products, such as stage lights , spotlights, educational machines, cinema machines, engineering machines, micro-projection or laser TV and other projection products. Light sources of different colors are located in different surface spaces. Since the light beams of different colors have been separated in angular space, the incident angles to the modulation component are different; since the surface angle conversion component has a surface angle conversion function for the light sources on its front focal surface. Function, a surface angle conversion component can directly convert different light source beams separated in angular space into light beams of different colors separated by surface space, and irradiate the modulation component to form sub-pixels of different colors. One pixel unit can realize full-color display; because the light source beam can be converted from angular space to surface space through one surface angle conversion component, which simplifies the projection display system, makes the system structure simple, and reduces the cost. In addition, the projection display system can be adapted to different application scenarios by designing the light-emitting components.

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 light modulator, characterized in that it includes:

The face angle conversion component is arranged on the outgoing light path of the multiple light source beams, and is used for performing face angle conversion on the multiple light source beams to form multiple convergent beams corresponding to the light source beams, wherein the multiple convergent beams are The beams are separated in surface space;

a modulation component, which is arranged on the outgoing light path of the face angle conversion component, and is integrally arranged with the face angle conversion component, and is used for modulating the multiple convergent light beams to form image light;

Wherein, the modulation component includes a plurality of pixel units, each of the pixel units includes at least three sub-pixels, each of the condensed light beams is respectively incident on the sub-pixels in the pixel unit, and each of the condensed light beams and the The sub-pixels are in one-to-one correspondence;

The face angle conversion assembly includes a microlens array composed of a plurality of microlenses, each of which is matched with a position of at least one of the pixel units, so as to converge the condensed light beam on the pixel unit.
The light modulator of claim 1, wherein:

The microlens array is a one-dimensional cylindrical microlens array, and the cylindrical microlens array includes a plurality of columns of microlenses, and each column of the microlenses corresponds to one column of the pixel units.
The light modulator of claim 2, wherein:

The number of the sub-pixels is four, the sub-pixels include red sub-pixels, green sub-pixels, blue sub-pixels and supplementary sub-pixels, and the color of the supplementary sub-pixels is red, green, blue or yellow. anyone.
The light modulator of claim 1, wherein:

The microlens array is a two-dimensional microlens array, and the microlenses of the two-dimensional microlens array are in one-to-one correspondence with the pixel units.
The light modulator of claim 4, wherein:

The shape of the microlens is hexagon, the number of the sub-pixels is four to seven, and the sub-pixels are arranged in a column direction, a row direction or a circumferential direction.
A projection display system is characterized by comprising: a light-emitting component and a light modulator, wherein the light-emitting component is used to generate multiple light source beams; the light modulator is arranged on the exit light path of the multiple light source light beams, and uses For modulating the multiple light source beams, the light modulator is the light modulator described in any one of claims 1-5.
The projection display system according to claim 6, wherein,

The projection display system further includes a first lens component, which is arranged on the outgoing light path of the light-emitting component, and is used for converting the multiple light source light beams, so that each light source light beam is Different incident angles are incident on the light modulator, wherein the light-emitting component is disposed near the front focal plane of the first lens component.
The projection display system according to claim 7, wherein the multiple light source beams include red light beams, green light beams and blue light beams, and the light-emitting components include:

A red light source for generating the red light beam;

a green light source for generating the green light beam;

a blue light source for generating the blue light beam;

Wherein, the red light source, the green light source and the blue light source are all disposed near the front focal plane of the first lens assembly.
The projection display system according to claim 8, wherein,

The projection display system further includes a scattering component, which is arranged on the outgoing light path of the light-emitting component, and is used for scattering the multiple light source beams to form multiple scattered beams; wherein, the scattered beams are The light spot is located near the front focal plane of the first lens assembly.
The projection display system according to claim 8 or 9, characterized in that:

The multiple light source beams include supplementary light beams, the light-emitting component includes supplemental light sources, the supplementary light sources are used to generate the supplementary light beams, and the supplementary light beams are used to improve the luminous brightness or color gamut of the light-emitting component, the The supplementary light source is disposed near the front focal plane of the first lens assembly.
The projection display system according to claim 7, wherein the light-emitting assembly comprises four light-emitting devices, and the four light-emitting devices are arranged in a two-dimensional matrix, and the projection display system further comprises:

The second lens assembly is arranged on the outgoing light paths of the four light-emitting devices, and is used for shaping the four light beams of the light source;

a third lens assembly, disposed on the outgoing light path of the second lens assembly, and used for condensing the light beams emitted by the second lens assembly;

The first homogenizing device group is arranged on the outgoing light path of the third lens assembly, and is used for homogenizing the light beam emitted by the third lens assembly.
The projection display system according to claim 7, wherein,

White light source, used to generate white light beam;

a fourth lens assembly, arranged on the optical path of the white light beam, for condensing the white light beam;

The wavelength selection component is arranged on the outgoing light path of the fourth lens component, and is used for receiving the light beam emitted by the fourth lens component, generating a red light beam, a green light beam and a blue light beam, and entering the first lens components.
The projection display system according to claim 12, wherein,

The wavelength selection component includes a first dichroic plate, a second dichroic plate and a third dichroic plate, and the first dichroic plate is used for reflecting the green light component in the white light beam to exit the green light beam; the second dichroic plate is used for reflecting the red light component in the white light beam to emit the red light beam; the third dichroic plate is used for reflecting the white light beam in the blue light component to exit the blue light beam.
The projection display system according to claim 7, wherein the light-emitting assembly comprises:

blue lasers for generating blue laser beams;

a selective reflection device, arranged on the outgoing optical path of the blue laser beam, for reflecting the blue laser beam;

a fifth lens assembly, disposed on the outgoing optical path of the blue laser beam, and used for condensing the blue laser beam reflected by the selective reflection device;

a wavelength conversion device, arranged on the outgoing optical path of the blue laser beam, for receiving the blue laser beam reflected by the selective reflection device, and generating a red light beam, a green light beam and a blue light beam, wherein the red light beam The light beam, the green light beam and the blue light beam become collimated beams with different colors separated by three beam angles after passing through the fifth lens assembly;

The sixth lens assembly is arranged on the outgoing optical path of the three collimated light beams with different colors, and is used for condensing the three collimated light beams with different colors;

The second homogenizing device group is arranged on the outgoing light path of the sixth lens assembly, and is used for homogenizing the light beam emitted by the sixth lens assembly.
The projection display system according to claim 14, wherein,

The red light beam is red fluorescent light, the green light beam is green fluorescent light, the wavelength conversion device includes three co-centered red light areas, green light areas and blue light areas, the red light area is provided with red light a wavelength conversion material for receiving the blue laser beam and generating the red fluorescence; the green light region is provided with a green wavelength conversion material for receiving the blue laser beam and generating the green fluorescence; the The blue light region is provided with a diffusing sheet, and the diffusing sheet is used for diffusing the blue laser beam.
The projection display system according to claim 6, wherein,

The modulation component in the light modulator is a digital micromirror device, and the projection display system further includes a reflection device and a total internal reflection device, the reflection device is arranged on the optical path of the multiple light source beams, and is used to The multiple light source light beams are reflected to the total internal reflection device, and the total internal reflection device is used to reflect the multiple light source light beams to the digital micromirror device, and modulate the digital micromirror array to reflect it out. The beam is transmitted to the subsequent optical system.
The projection display system according to claim 6, wherein,

The modulation component in the light modulator is a liquid crystal display with silicon, and the projection display system further includes a polarization beam splitting device, the polarization beam splitting device is arranged on the optical path of the multiple light source beams, and is used for the multiple beams. The light beam of the light source is processed and the processed light beam is injected into the liquid crystal with silicon display, and the light beam reflected by the liquid crystal with silicon display after modulation is transmitted to the subsequent optical system.