CN114079757A - Projection system and projection equipment - Google Patents

Abstract

The embodiment of the application provides a projection system and projection equipment, wherein the projection system comprises a light source, a spatial light modulator and a displacement structure; the light source is used for emitting display light; the spatial light modulator is arranged on a light path of display light emitted from the light source, and is used for modulating the display light emitted from the light source to emit image light; the spatial light modulator comprises a plurality of pixel units which are arranged in an array, and each pixel unit comprises a plurality of sub-pixel units; the displacement structure is used for moving the images displayed by the plurality of sub-pixel units of the spatial light modulator, so that each sub-pixel unit can display white light in space in any frame of image. The resolution of the spatial light modulator can be improved under the condition of not reducing the aperture ratio of the spatial light modulator; the problem of color separation can also be avoided.

Description

Projection system and projection equipment

Technical Field

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

Background

Projection devices are a popular and widely used product for projecting images onto a large screen for viewing by a single person or multiple persons. The projection device includes a spatial Light modulator, and the currently commonly used spatial Light modulator includes a Digital Light Processing (DLP), a Liquid Crystal Display (LCD), a Liquid Crystal On Silicon (LCOS), and the like.

Display systems using LCDs as spatial modulators have many advantages over conventional systems, such as larger projected image size, portability, and lower cost. The display effect of the liquid crystal display panel is related to parameters such as aperture ratio and resolution.

The aperture ratio is related to the area of the effective light-transmitting area in the display area of the LCD, and the ratio of the area of the effective light-transmitting area to the area of the display area is the aperture ratio of the LCD. Generally, the aperture ratio of the LCD is 50% to 80%.

The display area also comprises a non-light-transmission area except the effective light-transmission area, the area of the non-light-transmission area depends on the design scheme and process capability of the LCD, and under the condition that the size and the process capability of the LCD are certain, the larger the aperture ratio is, the smaller the resolution ratio is.

When the resolution is too low, the displayed picture of the LCD is easy to be distorted or unclear; when the aperture opening ratio is too low, the screen window effect occurs due to the large unlit area of the LCD, and the visual experience of a user is affected.

Disclosure of Invention

In view of the above problems, it is an object of the present application to provide a projection system and a projection apparatus that can improve the resolution of a spatial light modulator without reducing the aperture ratio of the spatial light modulator; the problem of color separation can also be avoided.

In a first aspect, an embodiment of the present application provides a projection system, including a light source, a spatial light modulator, and a displacement structure; the light source is used for emitting display light; the spatial light modulator is arranged on an optical path of display light emitted from the light source, and is used for modulating the display light emitted from the light source to emit image light; the spatial light modulator comprises a plurality of pixel units which are arranged in an array, and each pixel unit comprises a plurality of sub-pixel units; the displacement structure is used for moving the images displayed by the plurality of sub-pixel units of the spatial light modulator, so that each sub-pixel unit can display white light in space in any frame of image.

In a second aspect, the present application provides a projection apparatus, which includes a lens module and the projection system of the first aspect.

The projection system and the projection equipment provided by the embodiment of the invention comprise a light source, a spatial light modulator and a displacement structure. And when the spatial light modulator images, the spatial light modulator is moved along the row direction by using the displacement structure, so that the number of times of unidirectional movement of the image light of any color emitted from the spatial light modulator in one period is N, and the position of the image light of any color emitted from any sub-pixel after once movement is the position of the light emitted from the sub-pixel adjacent to the sub-pixel before movement. Therefore, any sub-pixel can display N sub-pictures in the process of moving in one period, after moving in one period, every N sub-pictures form a frame of new pixel units capable of displaying white pictures integrally, and the number of white light (full color light) pixel units is effectively increased in space, so that the resolution of the spatial light modulator is changed to be N times of that of the prior art under the condition of not changing the aperture ratio of the display panel, and the problem of color separation caused by over-small resolution is avoided, and the display effect is influenced. Meanwhile, only one spatial light modulator is needed, and the light sources do not need to respectively emit light with different colors according to a certain time sequence, so that the size and the cost of a projection system do not need to be increased, and the light emitting difficulty of the light sources does not need to be increased.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a projection system according to an embodiment of the present disclosure;

fig. 2 is a schematic layout diagram of a plurality of sub-pixel units according to an embodiment of the present disclosure;

fig. 3 is a schematic layout diagram of a plurality of sub-pixel units according to an embodiment of the present disclosure;

fig. 4 is an expanded schematic view of a pixel unit according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a spatial light modulator according to an embodiment of the present application;

FIG. 6 is a timing diagram illustrating the shifting of sub-pixels according to an embodiment of the present disclosure;

fig. 7 is an expanded schematic view of a pixel unit according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a projection system according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a projection system according to an embodiment of the present application;

fig. 10 is an expanded schematic view of a pixel unit according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application.

Reference numerals:

10-a projection system; 11-a light source; 12-a spatial light modulator; 121-pixel cells; 13-a displacement structure; 14-an antireflection film; 15-lower polarizer; 16-an upper polarizer; 17-a color filter layer; 21-an array substrate; 22-pair of cassette substrates; 23-a liquid crystal layer; 101-sub-pixel unit.

Detailed Description

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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

For the spatial light modulator with lower resolution, if the image displayed by the spatial light modulator with lower resolution is projected to be a large-size image, the distance between adjacent sub-pixel units can be resolved by human eyes, so that the problem of color separation occurs, and the display effect is affected.

The related art proposes two solutions: the first method is that a plurality of spatial light modulators are utilized to respectively display pictures with three colors of red, green and blue, and the pictures displayed by the three spatial light modulators are superposed; secondly, a single spatial light modulator respectively displays three pictures of red, green and blue according to a certain time sequence, and the three pictures are overlapped.

Among them, the first solution requires a plurality of spatial light modulators, which increases the overall size and investment cost of the projection apparatus. The second scheme displays pictures of three colors of red, green and blue according to time sequence, and increases the light emitting difficulty of the light source, thereby increasing the volume and the cost of the projection equipment.

Based on the above, the embodiment of the present invention provides a projection system, as shown in fig. 1, 8 and 9, including a light source 11, a spatial light modulator 12 and adisplacement structure 13. The light source 11 is used for emitting display light; the spatial light modulator 12 is disposed on an optical path of the display light emitted from the light source 11, and the spatial light modulator 12 is configured to modulate the display light emitted from the light source 11 to emit image light; the spatial light modulator 12 includes a plurality of pixel units arranged in an array, each pixel unit including a plurality of sub-pixel units; thedisplacement structure 13 is used to shift the images displayed by the sub-pixel units of the spatial light modulator 12, so that each sub-pixel unit can display white light spatially in any frame of image.

The following description is given with reference to specific examples:

example one

An embodiment of the present invention provides aprojection system 10, as shown in fig. 1, theprojection system 10 includes a light source 11, a spatial light modulator 12, and adisplacement structure 13. The light source 11 is disposed on the light incident side of the spatial light modulator 12, the light source 11 is configured to provide light for display, and the spatial light modulator 12 is configured to modulate light emitted from the light source 11 to emit image light. Thedisplacement structure 13 may be a micro actuator for moving the spatial light modulator 12 to move the image displayed by the plurality of sub-pixel units, so that each sub-pixel unit can display white light in space in any one frame of image.

As shown in fig. 2 and 3, the spatial light modulator 12 includes a plurality ofpixel units 121 arranged in an array, and eachpixel unit 121 includesN sub-pixel units 101. TheN sub-pixel units 101 in eachpixel unit 121 are arranged in the row direction.

As shown in fig. 4, thedisplacement structure 13 is configured to move the spatial light modulator 12N times along the row direction, so that any color light emitted from the spatial light modulator 12 or an image displayed by anysub-pixel unit 101 moves along the row direction, and an image area corresponding to anysub-pixel unit 101 on the target plane can display white light or full color light. The number of times of unidirectional movement of image light of any color emitted from the spatial light modulator 12 or an image displayed by anysub-pixel unit 101 in one period or one frame of image is N. It should be noted that, in one frame image, one frame image may be divided into a plurality of sub-frame images, where the number of sub-frame images is equal to the number N ofsub-pixel units 101. In addition, each moving process may move the image light of any color emitted from anysub-pixel unit 101 once to the position where the image light emitted from thesub-pixel unit 101 adjacent to thesub-pixel unit 101 before the moving is located.

As shown in fig. 1,projection system 10 may further include anantireflection film 14 disposed between light source 11 and spatial light modulator 12. Spatial light modulator 12 may be an LCD) or LCOS),projection system 10 further includes alower polarizer 15 disposed on the light-in side of spatial light modulator 12 and anupper polarizer 16 disposed on the light-out side of spatial light modulator 12.

In some embodiments, as shown in fig. 5, the spatial light modulator 12 may include anarray substrate 21, a pair of cell substrates 22, and a liquid crystal layer 23 between thearray substrate 21 and the pair of cell substrates 22. Thearray substrate 21 includes a plurality of thin film transistors, a gate line, a data line, and a pixel electrode. The common electrode and the Black Matrix (BM) may be disposed on thearray substrate 21 or may be disposed on the opposing substrate 22.

The thin film transistor may be a top gate type thin film transistor, a bottom gate type thin film transistor, a double gate type thin film transistor, or the like. The thin film transistor includes at least a gate electrode, a gate insulating layer, an active layer, a source electrode, and a drain electrode. The grid line is electrically connected with the grid electrode of the thin film transistor, the data line is electrically connected with the source electrode of the thin film transistor, and the drain electrode of the thin film transistor is electrically connected with the pixel electrode.

The material of the active layer may be Low Temperature Polysilicon (LTPS), monocrystalline Silicon, amorphous Silicon, metal oxide semiconductor, or the like.

Preferably, the material of the active layer is LTPS. On one hand, the thin film transistor including LTPS has a fast reaction speed, which can increase the refresh frequency of the spatial light modulator 12; on the other hand, compared with the active layer made of amorphous silicon or the like, the size of the active layer including LTPS can be made smaller, so as to reduce the size of the thin film transistor, so as to reduce the area of the non-sub-pixel region in the display region, thereby increasing the area of the sub-pixel region in the display region and improving the aperture ratio of the spatial light modulator 12.

In some embodiments, the driving manner of the LCD and the LCOS is not limited. The driving method can be driven by a Twisted Nematic (TN) type, a Vertical Alignment (VA) type, a Fringe Field Switching (FFS) type, an In Plane Switching (IPS) type, an ADvanced Super Dimension Switching (ADS) type, or the like.

Here, taking the TN mode driving, thelower polarizer 15 and theupper polarizer 16 as vertical and orthogonal as an example, whether an electric field is formed between the pixel electrode and the common electrode or not, the display conditions of the LCD and the LCOS are as follows:

when no voltage is applied, no electric field is formed between the pixel electrode and the common electrode, and the liquid crystal in the liquid crystal layer 23 is in a horizontal "lying" state. The light emitted by the light source 11 firstly passes through thelower polarizer 15, and the light passing through thelower polarizer 15 is first linearly polarized light; then, the first linearly polarized light enters the LCD (or LCOS) and passes through the liquid crystal layer 23, and according to the birefringence principle of the liquid crystal, the first linearly polarized light is decomposed into two beams of light, and the two beams of light have different propagation speeds, and when the two beams of light are combined into one beam of light, the polarization direction of the first linearly polarized light changes, and becomes a second linearly polarized light having the same polarization direction as theupper polarizer 16; finally, the second linearly polarized light is emitted (or reflected) from theupper polarizer 16, and normal display is realized. That is, the LCD or LCOS is normally white mode.

When a voltage is applied, an electric field is formed between the pixel electrode and the common electrode, and the liquid crystal in the liquid crystal layer 23 is in a vertical "standing" state by the electric field. The light emitted by the light source 11 firstly passes through thelower polarizer 15, and the light passing through thelower polarizer 15 is first linearly polarized light; thereafter, the first linearly polarized light enters the LCD or LCOS and passes through the liquid crystal layer 23 without changing its polarization direction, and thus, cannot exit (or reflect) from thesecond polarizer 16, displaying a black picture.

As for the above, if the spatial light modulator 12 is an LCD, the light is emitted from the LCD to realize display; if the spatial light modulator 12 is an LCOS, the light is reflected from the LCOS to realize the display. In some embodiments, if the liquid crystal spatial light modulator is driven in a TN-type or VA-type manner, the pixel electrode may be disposed on thearray substrate 21 and the common electrode may be disposed on the counter cell substrate 22.

If the LCD and the LCOS are driven by FFS, IPS, or ADS modes, both the pixel electrode and the common electrode may be disposed on thearray substrate 21.

In some embodiments, eachpixel cell 121 may include threesub-pixel cells 101 that differ in display color; alternatively, eachpixel unit 121 may include foursub-pixel units 101 different in display color; alternatively, the colors displayed by somesub-pixel units 101 in thepixel unit 121 are the same, and the displays displayed by other sub-pixels 101 are different.

If eachpixel unit 121 includes threesub-pixel units 101 with different display colors, the light emitted by the threesub-pixel units 101 in thepixel unit 121 may be three primary colors. If eachpixel unit 121 includes foursub-pixel units 101 with different display colors, the light emitted from the foursub-pixel units 101 in thepixel unit 121 at least includes three primary colors or the mixed light emitted from the foursub-pixel units 101 is white light.

Wherein, the three primary colors are red, green and blue respectively; alternatively, the three primary colors are magenta, cyan, and yellow, respectively.

In some embodiments, the color of the light emitted by the light source 11 comprises three primary colors; alternatively, the light emitted by the light source 11 is white in color.

Here, the color of the light emitted by the light source 11 depends on whether the spatial light modulator 12 includes a color filter layer. If the spatial light modulator 12 comprises a color filter layer, the color of the light emitted by the light source 11 may comprise three primary colors or may be white. If the spatial light modulator 12 does not comprise a color filter layer, the color of the light emitted by the light source 11 comprises three primary colors.

In some embodiments, in the case where the colors of theN sub-pixel units 101 in eachpixel unit 121 are different in the row direction, as shown in fig. 2, the colors of the plurality ofsub-pixel units 101 in any one column are the same in the column direction; alternatively, as shown in fig. 3, the colors of the plurality ofsub-pixel units 101 in one column are different in the column direction.

In some embodiments, the "row direction" in the embodiments of the present invention is not particularly limited, and refers to only one dimension. The row direction of the embodiment of the present invention is related to the placement of the spatial light modulator 12, and the row direction may be a left-right direction or an up-down direction.

Alternatively, as shown in fig. 2, if the row direction is the left-right direction, thedisplacement structure 13 may move the image light of any color emitted from the spatial light modulator 12 in the left-right direction; as shown in fig. 3, if the row direction is the up-down direction, thedisplacement structure 13 can move the image light of any color emitted from the spatial light modulator 12 in the up-down direction.

In some embodiments, a frame of image may be divided into a plurality of subframes, and every N subframes constitute one period, and one frame of image corresponds to one period. Here, N is a positive integer. The N sub-images displayed by the N sub-frames in one period may form a complete image of one frame.

Assuming that one frame image includes one period, the spatial light modulator 12 can be moved to the left N times within one period; alternatively, the spatial light modulator 12 may be moved to the right N times.

For example, as shown in fig. 4, taking thepixel unit 121 including the red sub-pixel R1, the green sub-pixel G1, and the blue sub-pixel B1 sequentially arranged from left to right as an example, in the process of displaying an image of one frame, thedisplacement structure 13 controls the spatial light modulator 12 to move rightward three times, namely, the first stage T1, the second stage T2, and the third stage T3. The stage T0 is the initial position of the image light of any color emitted from thepixel unit 121; the stage T1 is the position of the image light of any color emitted from thepixel unit 121 after the spatial light modulator 12 moves to the right once, and this stage can make the image light emitted from the red sub-pixel R1 move to the position of the image light emitted from the green sub-pixel G1 before moving, and so on; the stage T2 is the position of the image light of any color emitted from thepixel unit 121 after the spatial light modulator 12 moves to the right twice, and this stage can make the image light emitted from the red sub-pixel R1 move to the position of the image light emitted from the blue sub-pixel B1 before moving, and so on; the stage T3 is the position of the image light of any color emitted from thepixel unit 121 after the spatial light modulator 12 has moved three times to the right, and this stage can make the position of the image light emitted from the red sub-pixel R1 after the movement be the position of the image light emitted from the red sub-pixel R2 of anotherpixel unit 121 before the movement, and so on.

As shown in fig. 4, the projection system includes a plurality of fixed sub-pixel regions, taking the sub-pixel region a where the image light emitted from the green sub-pixel G2 at the stage T0 is located as an example, the image light emitted from the red sub-pixel R2 at the stage T1, the image light emitted from the blue sub-pixel B1 at the stage T2, and the image light emitted from the green sub-pixel G1 at the stage T3 form a new pixel unit a which can display a white picture (full color) in a whole frame in the sub-pixel region a, that is, the sub-pixel region corresponding to the new pixel unit a can display a white picture, that is, the sub-pixel unit can display a white picture (full color) in space.

As shown in fig. 4, the projection system includes a plurality of fixed sub-pixel regions B, taking the sub-pixel region B where the image light emitted from the blue sub-pixel B2 at the stage T0 is located as an example, the image light emitted from the green sub-pixel G2 at the stage T1, the image light emitted from the red sub-pixel R2 at the stage T2, and the image light emitted from the blue sub-pixel B1 at the stage T3 form a new pixel unit B in one frame which can display a white picture (full color) in its entirety in the sub-pixel region B, that is, the sub-pixel region B corresponding to the new pixel unit B can display a white picture, that is, the sub-pixel unit can display a white picture (full color) in space.

Similarly, a new pixel cell C, a new pixel cell D, and a new pixel cell E … … are formed

In summary, by moving the spatial light modulator 12 at different time stages within one frame of image, the sub-pixels emitted from anysub-pixel unit 101 of the spatial light modulator 12 can achieve white light display in space, and further the image resolution of the projection system in the target projection area is increased to 3 times of the original image resolution.

As shown in fig. 6, for the image light emitted from the red sub-pixel R2: at stage T1, the red light constituting a white (full-color) picture in the sub-pixel region a; at stage T2, the red light constituting a white (full-color) picture in the sub-pixel region B; at stage T3, the red light constituting a white (full-color) picture in the sub-pixel region C.

For the image light exiting the sub-pixel G2: at stage T1, green light constituting a white picture (full color) in the sub-pixel region B; at stage T2, green light constituting a white picture (full color) in the sub-pixel region C; at stage T3, green light constituting a white (full-color) picture in the sub-pixel region D is generated.

For the image light exiting the sub-pixel B2: at stage T1, blue light constituting a white picture (full color) in the sub-pixel region C; at stage T2, blue light constituting a white (full-color) picture in the sub-pixel region D; at stage T3, blue light constituting a white (full-color) picture in the sub-pixel region E.

In summary, by moving the spatial light modulator 12 at different time stages within one frame of image, any sub-pixel unit of the projection system can achieve white light display in space, and further the image resolution of the projection system in the target projection area is increased to 3 times of the original image resolution.

To sum up, it can be understood that "in any frame of image, each sub-pixel unit can display white light in space" in the present application, a frame of image includes a period, and in a period, image light emitted from the spatial light modulator 12 or the spatial light modulator 12 can be moved N times, so that image light emitted from sub-pixel units included in the spatial light modulator is moved N times, and then a target imaging area corresponding to each sub-pixel unit is a superposition of N different sub-pixel images, that is, by moving N times, a target imaging area corresponding to each sub-pixel unit can achieve white light display, that is, each sub-pixel unit can display white light in space. Compared with the existing spatial light modulator scheme that a plurality of sub-pixel units are combined into one pixel unit, the method and the device have the advantages that the high-resolution image display is realized by the low-resolution spatial light modulator, and the cost is greatly saved. In some embodiments, the spatial light modulator 12 is divided into a display area and a peripheral area located at the periphery of the display area, and the plurality ofpixel units 121 are located in the display area. As shown in fig. 4, when moving the spatial light modulator 12, for a circle ofpixel units 121 closest to the peripheral area in the display area, light of any color emitted from N-1sub-pixel units 101 in eachpixel unit 121 cannot constitute anew pixel unit 121 after one cycle of movement. However, considering that the circle ofpixel cells 121 closest to the peripheral region in the display region is very small in number for all thepixel cells 121 in the spatial light modulator 12, and the circle ofpixel cells 121 closest to the peripheral region in the display region may be an auxiliary (dummy) portion covered by BM, even if light emitted from N-1sub-pixel cells 101 in eachpixel cell 121 cannot constitute anew pixel cell 121, the picture displayed by the spatial light modulator 12 is not affected.

In some embodiments, in the foregoing embodiments, a frame of image is composed of sub-images displayed by a plurality of sub-frames, and under the condition that the refresh frequency corresponding to a frame of image is constant, the higher the refresh frequency of each sub-frame is, the better the eyesight of the user is. Therefore, the number of unidirectional light movements of any color emitted from the spatial light modulator 12 in one period is optionally 3. Thus, the refresh rate of each frame can reach 1/3 of the total refresh rate of one frame of picture.

Here, the LTPS liquid crystal display panel may be used to ensure that the refresh rate of each sub-frame is 60Hz, thereby achieving a refresh rate of 180Hz per frame image.

In some embodiments, as shown in fig. 4, the shape of the orthographic projection of thesub-pixel unit 101 on the light source 11 may be a rectangular row, and the short side of the rectangle coincides with the row direction.

In some embodiments, the light source 11 and the spatial light modulator 12 may be fixedly connected to each other; alternatively, the light source 11 and the spatial light modulator 12 may be separately fixed in theprojection system 10. If the light source 11 and the spatial light modulator 12 are fixedly connected to each other, the light source 11 is moved in the same direction by the same displacement while the spatial light modulator 12 is moved. If the light source 11 and the spatial light modulator 12 are fixed separately within theprojection system 10, only the spatial light modulator 12 is moved.

In some embodiments, if the light source 11 and the spatial light modulator 12 are separately fixed in theprojection system 10, the spatial light modulator 12 may move within the optical path of the display light emitted from the light source 11 in order not to affect the normal display of the spatial light modulator 12.

In some embodiments, the micro-actuator may be a step piezo ceramic micro-actuator or a step voice coil motor. Under the condition of applying voltage, the stepping piezoelectric ceramic micro actuator can generate deformation in the length direction, so as to drive the spatial light modulator 12 to move linearly. The stepping voice coil motor is a direct current servo motor which can convert an electric signal into linear displacement, and the spatial light modulator 12 can be driven to move linearly by inputting the electric signal into the stepping voice coil motor.

Here, the step piezoelectric ceramic micro actuator and the step voice coil motor have the advantages of simple overall structure, high driving speed, high positioning accuracy, and the like, and therefore, the embodiment of the present invention may use the step piezoelectric ceramic micro actuator and the step voice coil motor to drive the spatial light modulator 12 to move, so that the image light of any color emitted from the spatial light modulator 12 moves along the row direction.

The embodiment of the invention provides aprojection system 10, which comprises a light source 11, a spatial light modulator and adisplacement structure 13. While the spatial light modulator 12 forms an image, the spatial light modulator 12 is moved in the row direction by thedisplacement structure 13, so that the number of times of unidirectional movement of the image light of any color emitted from the spatial light modulator 12 in one period is N, and the position where the image light of any color emitted from any sub-pixel 101 is moved once is the position where the light emitted from the sub-pixel 101 adjacent to the sub-pixel 101 before the movement is located. Thus, any sub-pixel 101 can display N sub-pictures in the process of moving in one period, after moving in one period, every N sub-pictures form anew pixel unit 121 capable of displaying a white picture as a whole, and the number of white (full color)pixel units 121 is effectively increased spatially, so that the resolution of the spatial light modulator 12 is N times that of the prior art without changing the aperture ratio of the display panel 12, thereby avoiding the problem of color separation due to too small resolution and affecting the display effect. Meanwhile, the invention only needs one spatial light modulator 12, and the light source 11 does not need to emit light with different colors according to a certain time sequence, so the invention does not need to increase the volume and the cost of theprojection system 10, and does not need to increase the light emitting difficulty of the light source 11.

Example two

Referring to fig. 7, aprojection system 10 according to a second embodiment of the present application is shown. Theprojection system 10 in this embodiment has substantially the same structure as theprojection system 10 provided in the first embodiment, and the difference is mainly that: thesub-pixel unit 101 in the spatial light modulator 12 is square in shape, and the side length of the square is the same as the short side length of thesub-pixel unit 101 that is rectangular in shape.

The embodiment of the invention provides aprojection system 10, where theprojection system 10 includes a spatial light modulator 12, the spatial light modulator 12 includes a plurality ofsub-pixel units 101, and thesub-pixel units 101 are square. Compared with the scheme that the shape of the sub-pixel 101 is rectangular, moresub-pixel units 101 in a square shape can be disposed in the spatial light modulator 12 of the present embodiment. For example, the aspect ratio of therectangular subpixels 101 is usually 3:1, and when the size of the spatial light modulator 12 is constant, the number ofsquare subpixels 101 is three times the number ofrectangular subpixels 101. That is, in the case of obtaining the same resolution as that of the foregoing first embodiment, the number ofsub-pixel units 101 required to be controlled in the present embodiment is only one third of the number ofsub-pixel units 101 required to be controlled in the first embodiment.

EXAMPLE III

Referring to fig. 8, aprojection system 10 according to a third embodiment of the present application is shown. Theprojection system 10 in this embodiment has substantially the same structure as theprojection system 10 provided in the first and second embodiments, and the difference is mainly that: thedisplacement structure 13 is a beam deflector provided on the optical path of the image light emitted from the spatial light modulator 12, the beam deflector being used to deflect the image light, instead of thedisplacement structure 13 of the first embodiment driving the spatial light modulator 12 to move.

In some embodiments, the beam deflector may be a glass mirror or an acousto-optic deflector.

The glass lens may be a thin glass lens, and the light emitted from thesub-pixel unit 101 can be deflected in the row direction by using the refraction principle of the light. The acousto-optic deflector can change the angle of the laser according to an acousto-optic interaction mechanism.

The embodiment of the invention provides aprojection system 10, which comprises a light source 11, a spatial light modulator 12 and adisplacement structure 13. While the spatial light modulator 12 is displaying, the image light emitted from the spatial light modulator 12 is deflected in the row direction by thedisplacement structure 13, so that the number of times of unidirectional movement of the image light of any color emitted from the spatial light modulator 12 in one period is N, and the position where the light of any color emitted from anysub-pixel unit 101 is located after once movement is the position where the light emitted from thesub-pixel unit 101 adjacent to thesub-pixel unit 101 before movement is located. Thus, in the projection target imaging plane, N sub-pictures can be displayed in the process that the sub-pixel region corresponding to any sub-pixel 101 moves in one period, after the sub-pictures move in one period, every N sub-pictures form anew pixel unit 121 which can display a white picture as a whole, and the number of thepixel units 121 of the projection target imaging plane is effectively increased in space, so that the resolution of the spatial light modulator 12 is changed to be N times of that of the prior art under the condition that the aperture ratio of the spatial light modulator 12 is not changed, and the problem of color separation caused by over-small resolution is avoided, and the display effect is not influenced. Meanwhile, the invention only needs one spatial light modulator 12, and the light source 11 does not need to emit light with different colors according to a certain time sequence, so the invention does not need to increase the volume and the cost of theprojection system 10, and does not need to increase the light emitting difficulty of the light source 11.

Example four

Referring to fig. 9 and 10, aprojection system 10 according to a fourth embodiment of the present application is shown. Theprojection system 10 in this embodiment is substantially the same as theprojection system 10 provided in the first, second, and third embodiments, and the difference is mainly that: the light emitted by the light source 11 is white light, the spatial light modulator 12 further includes acolor filter layer 17 located on the optical path of the image light, and thecolor filter layer 17 filters at least the white light emitted by the light source 11 into three primary colors; thedisplacement structure 13 is a micro actuator, and the micro actuator is used to move the images displayed by thesub-pixel units 101, so that eachsub-pixel unit 101 can display white light spatially in any one frame of image.

Here, thecolor filter layer 17 includes a plurality of filter units, and eachsub-pixel unit 101 corresponds to one filter unit each time thecolor filter layer 17 is moved.

In some embodiments, the material of thecolor filter layer 17 is not limited as long as thecolor filter layer 17 can filter white light into three primary colors. Taking three primary colors of red, green and blue as an example, in the red sub-pixel region, thecolor filter layer 17 can only allow light in a red waveband to pass through; in the green sub-pixel region, thecolor filter layer 17 can pass only light in the green wavelength band; in the blue sub-pixel region, thecolor filter layer 17 can pass only light in the blue wavelength band.

For example, the material of thecolor filter layer 17 may include a dye. Alternatively, thecolor filter layer 17 is formed of a plurality of first insulating films and second insulating films alternately, and achieves a filtering effect by utilizing the principle of coherence. Wherein the refractive index of the first insulating film is different from the refractive index of the second insulating film.

In some embodiments, thecolor filter layer 17 may be integrated on the spatial light modulator 12; alternatively, thecolor filter layer 17 may be formed separately from the spatial light modulator 12 on the side of theupper polarizer 16 facing away from the spatial light modulator 12.

Alternatively, thecolor filter layer 17 is separately formed outside the spatial light modulator 12.

In some embodiments, the micro-actuator may be a step piezo ceramic micro-actuator or a step voice coil motor. Under the condition of applying voltage, the stepping piezoelectric ceramic micro actuator can generate deformation in the length direction, so that thecolor filter layer 17 is driven to move linearly. The stepping voice coil motor is a direct current servo motor which can convert an electric signal into linear displacement, and thecolor filter layer 17 can be driven to move linearly by the mode of inputting the electric signal into the stepping voice coil motor.

Here, the step piezoelectric ceramic micro actuator and the step voice coil motor have the advantages of simple overall structure, high driving speed, high positioning accuracy, and the like, and therefore, in the embodiment of the present invention, the step piezoelectric ceramic micro actuator and the step voice coil motor may be used to drive thecolor filter layer 17 to move, so that the image light of any color emitted from the spatial light modulator 12 moves in the row direction.

In some embodiments, assuming that one frame image includes one period, thecolor filter layer 17 may be moved to the left N times within one period; or, thecolor filter layer 17 may be moved to the right N times.

For example, as shown in fig. 10, theshadow system 10 includes a plurality of fixed sub-pixel regions, and taking as an example that thepixel unit 121 includes a red sub-pixel R1, a green sub-pixel G1, and a blue sub-pixel B1 sequentially arranged from left to right, thedisplacement structure 13 controls thecolor filter layer 17 to move rightward three times in the process of displaying one frame of image, which are the first stage T1, the second stage T2, and the third stage T3.

As shown in fig. 10, taking the sub-pixel region a where the image light emitted from the red sub-pixel R1 at the stage T0 is located as an example, the image light emitted from the blue sub-pixel B2 at the stage T1, the image light emitted from the green sub-pixel G2 at the stage T2, and the image light emitted from the red sub-pixel R2 at the stage T3 form a new pixel unit a capable of displaying a white screen (full color) in one frame in the sub-pixel region a, that is, the sub-pixel region a corresponding to the new pixel unit a can display a white screen.

As shown in fig. 10, taking the sub-pixel region B where the image light emitted from the green sub-pixel G1 at the stage T0 is located as an example, in the sub-pixel region B, the image light emitted from the red sub-pixel R1 at the stage T1, the image light emitted from the blue sub-pixel B2 at the stage T2, and the image light emitted from the green sub-pixel G2 at the stage T3 form a new pixel unit B which can display a white screen (full color) in a whole frame in the sub-pixel region B, that is, the sub-pixel region B corresponding to the new pixel unit B can display a white screen.

As shown in fig. 10, taking the sub-pixel region C where the image light emitted from the blue sub-pixel B1 at the stage T0 is located as an example, the image light emitted from the green sub-pixel G1 at the stage T1, the image light emitted from the red sub-pixel R2 at the stage T2, and the image light emitted from the blue sub-pixel B2 at the stage T3 in the sub-pixel region C constitute a new pixel cell C which can display a white screen (full color) in a whole frame in the sub-pixel region C, that is, the sub-pixel region C corresponding to the new pixel cell C can display a white screen.

In summary, by moving thecolor filter layer 17 at different time stages within one frame of image, white light display can be realized in any sub-pixel area of theprojection system 10, and the image resolution of theprojection system 10 in the target projection area is further increased to 3 times of the original image resolution.

The embodiment of the invention provides aprojection system 10, which comprises a light source 11, a spatial light modulator 12 and adisplacement structure 13. While the spatial light modulator 12 is displaying, thecolor filter layer 17 is moved in the row direction by thedisplacement structure 13, so that the number of times of unidirectional movement of light of any color emitted from the spatial light modulator 12 in one period is N, and the position where image light of any color emitted from anysub-pixel unit 101 is located after once movement is the position where image light emitted from a sub-pixel 101 adjacent to thesub-pixel unit 101 before movement is located. Thus, anysub-pixel unit 101 can display N sub-pictures in the process of moving in one period, after moving in one period, every N sub-pictures form anew pixel unit 121 capable of displaying a white picture as a whole, and the number of thepixel units 121 is effectively increased spatially, so that the resolution of the spatial light modulator 12 is N times that of the prior art under the condition of not changing the aperture ratio of the spatial light modulator 12, and the problem of color separation caused by too small resolution is avoided, and the display effect is not affected. Meanwhile, the invention only needs one spatial light modulator 12, and does not need to make the light source 11 emit the display lights with different colors according to a certain time sequence, so the invention does not need to increase the volume and the cost of theprojection system 10, and does not need to increase the light emitting difficulty of the light source 11.

EXAMPLE five

An embodiment of the present invention further provides a projection apparatus, as shown in fig. 11, including a lens module 20 and theprojection system 10 according to any of the foregoing embodiments.

The working process of the projection equipment is as follows: the image light emitted from the spatiallight modulator 10 is magnified by the lens module 20 and projected onto an object to be projected.

Here, the object to be projected may be a wall or a curtain or the like.

The explanation of the projection apparatus in the embodiment of the present invention is the same as the explanation of theprojection system 10 in the foregoing embodiment, and is not repeated herein.

Optionally, the projection apparatus further comprises a controller for controlling thedisplacement structure 13 while the spatial light modulator 12 is displaying, so as to move the images displayed by thesub-pixel units 101 of the spatial light modulator 12, so that eachsub-pixel unit 101 can display white light spatially in any one frame of image.

In some embodiments, thedisplacement structure 13 may be controlled by a controller, and this is not particularly limited in the embodiments of the present invention. Illustratively, the controller may be a control circuit.

In the embodiment of the present invention, the controller may be used to control thedisplacement structure 13, and when the spatial light modulator 12 displays a picture, thedisplacement structure 13 is controlled to control image light of any color emitted from the spatial light modulator 12 to move in a single direction; when the spatial light modulator 12 does not display a picture, thedisplacement structure 13 is controlled to stop working.

An embodiment of the present invention provides a projection apparatus, including theprojection system 10 according to any of the foregoing embodiments, where theprojection system 10 includes a light source 11, a spatial light modulator 12, and adisplacement structure 13. The advantages of the projection apparatus are the same as those of theprojection system 10, and will not be described herein.

EXAMPLE six

An embodiment of the present invention further provides a method for controlling a projection device according to a fifth embodiment, where the method includes: thedisplacement structure 13 is controlled to move the images displayed by thesub-pixel units 101 of the spatial light modulator 12 while the spatial light modulator 12 is displaying, so that eachsub-pixel unit 101 can display white light spatially in any one frame of image.

The embodiment of the invention provides a control method of a projection device, and the explanation and the beneficial effects of the control method are the same as those of the projection device, and are not repeated herein.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A projection system comprising a light source, a spatial light modulator and a displacement structure;

the light source is used for emitting display light;

the spatial light modulator is arranged on a light path of display light emitted from the light source, and is used for modulating the display light emitted from the light source to emit image light;

the spatial light modulator comprises a plurality of pixel units which are arranged in an array, and each pixel unit comprises a plurality of sub-pixel units;

the displacement structure is used for moving the images displayed by the plurality of sub-pixel units of the spatial light modulator, so that each sub-pixel unit can display white light in space in any frame of image.

2. The projection system of claim 1, wherein the displacement structure is a micro-actuator configured to move the spatial light modulator to move the image displayed by the plurality of sub-pixel units included in the spatial light modulator.

3. The projection system of claim 1, wherein the displacement structure is a beam deflector disposed in an optical path of the image light emitted from the spatial light modulator; the beam deflector is used for moving the image displayed by a plurality of sub-pixel units contained in the spatial light modulator.

4. The projection system of claim 3, wherein the beam deflector comprises a glass mirror or an acousto-optic deflector.

5. The projection system of claim 2, wherein the spatial light modulator further comprises a color filter layer that filters at least the display light to three primary colors;

the micro actuator is used for moving the color filter layer so as to move the images displayed by the plurality of sub-pixel units.

6. The projection system of claim 2 or 5, wherein the micro-actuator comprises a stepping piezoceramic micro-actuator or a stepping voice coil motor.

7. The projection system of any of claims 1-5, wherein the pixel elements of the spatial light modulator comprise a red sub-pixel element, a green sub-pixel element, and a blue sub-pixel element arranged in sequence;

in displaying a frame of image, the displacement structure is used for moving image light emitted by the red sub-pixel unit, the green sub-pixel unit and the blue sub-pixel unit 3 times along the same direction, so that any one of the red sub-pixel unit, the green sub-pixel unit and the blue sub-pixel unit can display white light spatially.

8. The projection system of any of claims 1-5, wherein the image light spot emerging from the sub-pixel element is square or rectangular.

9. A projection apparatus comprising a lens module and the projection system of any one of claims 1-8.

10. The projection apparatus of claim 9 further comprising a controller for controlling the displacement structure to move the image displayed by the plurality of sub-pixel elements of the spatial light modulator while the spatial light modulator is displaying such that each sub-pixel element is spatially displayable as white light in any one frame of image.

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