WO2022033384A1

WO2022033384A1 - Projection system and projection device

Info

Publication number: WO2022033384A1
Application number: PCT/CN2021/110773
Authority: WO
Inventors: 胡飞; 陈彦哲; 陈晨; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2020-08-13
Filing date: 2021-08-05
Publication date: 2022-02-17
Also published as: CN114079757A

Abstract

The embodiments of the present application provide a projection system and a projection device. The projection system comprises a light source (11), a spatial light modulator (12) and a displacement structure (13); the light source (11) is used for emitting display light; the spatial light modulator (12) is provided on a light path of the display light emitted from the light source (11), and the spatial light modulator (12) is used for modulating the display light emitted from the light source (11), so as to emit image light; the spatial light modulator (12) comprises a plurality of pixel units arranged in an array, each pixel unit comprising a plurality of sub-pixel units; and the displacement structure (13) is used for moving images displayed by the plurality of sub-pixel units of the spatial light modulator (12), so that in any image, each sub-pixel unit can display white light in space. The resolution of the spatial light modulator (12) can be improved without reducing the aperture ratio of the spatial light modulator (12), and the problem of color separation can be further avoided.

Description

Projection system and projection equipment

technical field

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

Background technique

Projection equipment is a popular and widely used product for projecting images on a large screen for single or multiple viewing. Projection equipment includes spatial light modulators. Currently commonly used spatial light modulators include Digital Light Processing (DLP), Liquid Crystal Display (LCD), and Liquid Crystal on Silicon (Liquid Crystal on Silicon, Referred to as LCOS) and so on.

Compared with traditional systems, display systems using LCD as spatial modulator have many advantages, such as larger size ratio of projected images, portability and low 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 includes non-light-transmitting areas other than the effective light-transmitting area. The area of the non-light-transmitting area depends on the design process capability of the LCD. Under the condition that the size and process capability of the LCD are certain, the larger the aperture ratio, the higher the resolution. smaller.

When the resolution is too low, it is easy to cause the display screen of the LCD to be distorted or unclear; when the aperture ratio is too low, the screen window effect will appear due to the large unlit area of the LCD, affecting the user's visual experience.

SUMMARY OF THE INVENTION

In view of the above problems, the purpose of the present application is to provide a projection system and a projection device, which can improve the resolution of the spatial light modulator without reducing the aperture ratio of the spatial light modulator; and can also avoid the occurrence of color separation. question.

In a first aspect, the embodiments of the present application provide a projection system, including a light source, a spatial light modulator and a displacement structure; the light source is used to emit display light; the spatial light modulator is arranged on the optical path of the display light emitted from the light source, and the spatial light The light modulator is used to modulate the display light emitted from the light source to emit image light; the spatial light modulator includes a plurality of pixel units arranged in an array, and each pixel unit includes a plurality of sub-pixel units; the displacement structure is used to modulate the spatial light The image displayed by the multiple sub-pixel units of the monitor is moved, so that in any frame of image, each sub-pixel unit can spatially display white light.

In a second aspect, the present application provides a projection device including a lens module and the projection system described in the first aspect.

The projection system and the projection device according to the embodiments of the present invention include a light source, a spatial light modulator, and a displacement structure. While the spatial light modulator is imaging, the spatial light modulator is moved along the row direction by the displacement structure, so that in one cycle, the number of unidirectional movement of the image light of any color from the spatial light modulator is N, and any one The position of the image light of any color emitted by the sub-pixel after one movement is the position of the light emitted by the sub-pixel adjacent to the sub-pixel before the movement. In this way, any sub-pixel can display N sub-pictures in the process of moving in one cycle. After moving in one cycle, every N sub-pictures constitute a new pixel unit that can display a white picture as a whole. Spatially, , which effectively increases the number of white light (full color light) pixel units, so that the resolution of the spatial light modulator becomes N times that of the prior art without changing the aperture ratio of the display panel, avoiding resolution due to If it is too small, there will be a problem of color separation, which will affect the display effect. At the same time, since the present invention only needs one spatial light modulator and does not need to make the light sources emit light of different colors according to a certain sequence, the present invention does not need to increase the volume and cost of the projection system, and does not need to increase the difficulty of the light source emitting light.

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 skilled in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic structural diagram of a projection system proposed by an embodiment of the present application;

FIG. 2 is a schematic diagram of the arrangement of a plurality of sub-pixel units according to an embodiment of the present application;

FIG. 3 is a schematic diagram of the arrangement of a plurality of sub-pixel units according to an embodiment of the present application;

FIG. 4 is an expanded schematic diagram of a pixel unit proposed by an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a spatial light modulator proposed by an embodiment of the present application;

FIG. 6 is a timing diagram of displacement of a sub-pixel according to an embodiment of the present application;

FIG. 7 is an expanded schematic diagram of a pixel unit proposed by an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a projection system proposed by an embodiment of the present application;

FIG. 9 is a schematic structural diagram of a projection system proposed by an embodiment of the present application;

FIG. 10 is an expanded schematic diagram of a pixel unit proposed by an embodiment of the present application;

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

Reference number:

10-projection system; 11-light source; 12-spatial light modulator; 121-pixel unit; 13-displacement structure; 14-anti-reflection film; 15-lower polarizer; 16-upper polarizer; 17-color filter layer ; 21-array substrate; 22-cell substrate; 23-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. 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 work fall within the protection scope of the present application.

For a spatial light modulator with a lower resolution, if the picture displayed by the spatial light modulator with a lower resolution is projected as a large-size picture, the spacing between adjacent sub-pixel units will be able to be distinguished by the human eye. As a result, the color separation problem occurs, which affects the display effect.

The related art proposes two solutions: the first one uses multiple spatial light modulators to display images of red, green and blue colors respectively, and superimposes the images displayed by the three spatial light modulators; , a single spatial light modulator displays pictures of three colors of red, green and blue according to a certain time sequence, and superimposes the three pictures.

Among them, the first solution needs to use multiple spatial light modulators, which will increase the overall volume and investment cost of the projection device. The second scheme displays pictures of three colors of red, green, and blue according to the time sequence, which will increase the difficulty of emitting light of the light source, thereby increasing the volume and cost of the projection equipment.

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

Described below in conjunction with specific embodiments:

Example 1

An embodiment of the present invention provides a projection system 10 . As shown in FIG. 1 , the projection system 10 includes a light source 11 , a spatial light modulator 12 and a displacement structure 13 . The light source 11 is disposed on the light incident side of the spatial light modulator 12 , the light source 11 is used for providing display light, and the spatial light modulator 12 is used for modulating the light emitted from the light source 11 to emit image light. The displacement structure 13 may be a micro-actuator for moving the spatial light modulator 12 to move images displayed by a plurality of sub-pixel units, so that in any frame of image, each sub-pixel unit can spatially display white light.

As shown in FIGS. 2 and 3 , the spatial light modulator 12 includes a plurality of pixel units 121 arranged in an array, and each pixel unit 121 includes N sub-pixel units 101 . The N sub-pixel units 101 in each pixel unit 121 are arranged in the row direction.

As shown in FIG. 4 , the displacement structure 13 is used to move and move the spatial light modulator 12 N times along the row direction, so that any color light emitted from the spatial light modulator 12 or an image displayed by any sub-pixel unit 101 Moving along the row direction, and then on the target plane, the image area corresponding to any sub-pixel unit 101 can display white light or full-color light. In one cycle or in one frame of image, the number of times of unidirectional movement of the image light of any color emitted from the spatial light modulator 12 or the image displayed by any sub-pixel unit 101 is N. It should be noted that, in one frame of image, one frame of image may be divided into multiple sub-frame images, wherein the number of sub-frame images is equal to the number N of sub-pixel units 101 . In addition, the position of the image light of any color emitted from any sub-pixel unit 101 can be moved once in each moving process, which is the image emitted by the sub-pixel unit 101 adjacent to the sub-pixel unit 101 before the movement. where the light is.

As shown in FIG. 1 , the projection system 10 may further include an anti-reflection film 14 disposed between the light source 11 and the spatial light modulator 12 . The spatial light modulator 12 may be an LCD) or an LCOS), and the projection system 10 further includes a lower polarizer 15 disposed on the light incident side of the spatial light modulator 12 and an upper polarizer 16 disposed on the light exit side of the spatial light modulator 12 .

In some embodiments, as shown in FIG. 5 , the spatial light modulator 12 may include an array substrate 21 , a cell assembling substrate 22 , and a liquid crystal layer 23 between the array substrate 21 and the cell assembling substrate 22 . The array substrate 21 includes a plurality of thin film transistors, gate lines, data lines and pixel electrodes. The common electrode and the black matrix (BM) can be arranged on the array substrate 21 or on the cell assembly 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 gate line is electrically connected to the gate electrode of the thin film transistor, the data line is electrically connected to the source electrode of the thin film transistor, and the drain electrode of the thin film transistor is electrically connected to the pixel electrode.

The material of the active layer may be low temperature polysilicon (Low Temperature Poly-Silicon, LTPS for short), single crystal silicon, amorphous silicon, metal oxide semiconductor, and the like.

Preferably, the material of the active layer is LTPS. On the one hand, the response speed of the thin film transistor including LTPS is fast, which can improve the refresh frequency of the spatial light modulator 12; It can be made smaller, thereby reducing the size of the thin film transistor to reduce the area of the non-sub-pixel area in the display area, thereby increasing the area of the sub-pixel area in the display area and increasing the aperture ratio of the spatial light modulator 12 .

In some embodiments, the driving modes of the LCD and the LCOS are not limited. Twisted Nematic (TN) type, Vertical Alignment (VA) type, Fringe Field Switching (FFS) type, In Plane Switch (IPS) type, Advanced super-dimensional field switch (ADvanced Super Dimension Switch, ADS for short) type and other ways to drive.

Here, taking TN-type driving and the lower polarizer 15 and the upper polarizer 16 being vertically orthogonal as an example, whether or not an electric field is formed between the pixel electrode and the common electrode, the display conditions of LCD and 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 first passes through the lower polarizer 15, and the light passing through the lower polarizer 15 is the first linearly polarized light; after that, the first linearly polarized light enters the LCD (or LCOS) and passes through the liquid crystal layer 23, according to the birefringence of the liquid crystal. In principle, the first linearly polarized light is decomposed into two beams of light, and the two beams of light travel at different speeds. When the two beams of light are combined into one beam of light, the polarization direction of the first linearly polarized light changes, becoming the same as the upper polarizer. The second linearly polarized light with the same polarization direction of 16; finally, the second linearly polarized light is emitted (or reflected) from the upper polarizer 16 to realize normal display. That is, the LCD or LCOS is in the normally white mode.

When a voltage is applied, an electric field is formed between the pixel electrode and the common electrode, and under the action of the electric field, the liquid crystal in the liquid crystal layer 23 is in a vertical "standing" state. The light emitted by the light source 11 first passes through the lower polarizer 15, and the light passing through the lower polarizer 15 is the first linearly polarized light; after that, the first linearly polarized light enters the LCD or LCOS and passes through the liquid crystal layer 23, and its polarization direction does not change, Therefore, it cannot be emitted (or reflected) from the second polarizer 16, and a black screen is displayed.

For the above, if the spatial light modulator 12 is an LCD, the light is emitted from the LCD to achieve display; if the spatial light modulator 12 is an LCOS, the light is reflected from the LCOS to achieve display. In some embodiments, if the liquid crystal spatial light modulator is driven in a TN-type or VA-type manner, the pixel electrodes may be arranged on the array substrate 21 , and the common electrodes may be arranged on the cell assembly substrate 22 .

If the LCD and the LCOS are driven in the FFS type, the IPS type, or the ADS type, both the pixel electrodes and the common electrodes can be arranged on the array substrate 21 .

In some embodiments, each pixel unit 121 may include three sub-pixel units 101 that display different colors; or, each pixel unit 121 may include four sub-pixel units 101 that display different colors; or, some sub-pixels in the pixel unit 121 The color displayed by the unit 101 is the same, and the display displayed by the other sub-pixels 101 is different.

If each pixel unit 121 includes three sub-pixel units 101 with different display colors, the lights emitted by the three sub-pixel units 101 in the pixel unit 121 can be three primary colors of each other. If each pixel unit 121 includes four sub-pixel units 101 with different display colors, the light emitted by the four sub-pixel units 101 in the pixel unit 121 includes at least three primary color lights or the mixed light emitted by the four sub-pixel units 101 is white light.

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

In some embodiments, the color of the light emitted by the light source 11 includes three primary colors; or, the color of the light emitted by the light source 11 is white.

Here, the color of the light emitted by the light source 11 is related to whether the spatial light modulator 12 includes a color filter layer. If the spatial light modulator 12 includes a color filter layer, the color of the light emitted by the light source 11 may include three primary colors, or may be white. If the spatial light modulator 12 does not include a color filter layer, the color of the light emitted by the light source 11 includes three primary colors.

In some embodiments, along the row direction, when the colors of the N sub-pixel units 101 in each pixel unit 121 are different, as shown in FIG. 2 , along the column direction, the plurality of sub-pixel units 101 in any column The colors are all the same; or, as shown in FIG. 3 , along the column direction, the colors of the sub-pixel units 101 in a column are all different.

In some embodiments, the embodiments of the present invention do not specifically limit the "row direction", but only refer to a one-dimensional direction. The row direction in the embodiment of the present invention is related to the placement method of the spatial light modulator 12 , and the row direction may be the left-right direction or the up-down direction.

Optionally, as shown in FIG. 2 , if the row direction is the left and right direction, the displacement structure 13 can move the image light of any color emitted from the spatial light modulator 12 along the left and right direction; as shown in FIG. If the direction is the up-down direction, the displacement 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, one frame of image may be divided into multiple subframes, each N subframes constitute a period, and one frame of image corresponds to one period. Here, N is a positive integer. Wherein, N sub-images displayed by N sub-frames in a period may constitute a complete image.

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

As an example, as shown in FIG. 4 , taking the pixel unit 121 including red sub-pixels R1, green sub-pixels G1, and blue sub-pixels B1 arranged in sequence from left to right as an example, in the process of displaying one frame of image, the displacement structure 13 controls the spatial light modulator 12 to move to the right three times, namely the first stage T1, the second stage T2, and the third stage T3. The T0 stage is the initial position of the image light of any color emitted from the pixel unit 121; the T1 stage is the image light of any color emitted from the pixel unit 121 after the spatial light modulator 12 moves to the right once. At this stage, the position of the image light emitted from the red sub-pixel R1 after being moved is the position of the image light emitted from the green sub-pixel G1 before the movement, and so on; the T2 stage is spatial light modulation After the detector 12 is moved to the right twice, the position of the image light of any color emitted from the pixel unit 121, at this stage, the position of the image light emitted from the red sub-pixel R1 after being moved is the position of the image light emitted from the red sub-pixel R1 before moving. The position of the image light emitted by the blue sub-pixel B1, and so on; the stage T3 is the position of the image light of any color emitted from the pixel unit 121 after the spatial light modulator 12 moves to the right three times. This stage The position of the image light emitted from the red sub-pixel R1 after being moved may be the position of the image light emitted from the red sub-pixel unit R2 of another pixel unit 121 before the movement, and so on.

Among them, 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 is located in the T0 stage as an example, in the sub-pixel region A and the T1 stage, the The image light emitted from the red sub-pixel R2, the image light emitted from the blue sub-pixel B1 in the T2 stage, and the image light emitted from the green sub-pixel G1 in the T3 stage form a frame in the sub-pixel area A, which can display white as a whole. The new pixel unit A of the picture (full color), that is, the sub-pixel area 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 is located in the T0 stage as an example, in the sub-pixel region B and the T1 stage, the The image light emitted by the green sub-pixel G2, the image light emitted from the red sub-pixel R2 in the T2 stage, and the image light emitted by the blue sub-pixel B1 in the T3 stage constitute a frame in the sub-pixel area B, which can display white as a whole. The new pixel unit B of the picture (full color), that is, the sub-pixel area 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.

In the same way, new pixel unit C, pixel unit D, pixel unit E...

To sum up, by moving the spatial light modulator 12 at different time stages in one frame of image, the sub-pixels emitted by any sub-pixel unit 101 of the spatial light modulator 12 can spatially realize white light display, which further enables the projection of white light. The image resolution of the system in the target projection area is increased by 3 times.

As shown in Figure 6, for the image light emitted by the red sub-pixel R2: in the T1 stage, it is the red light that forms a white screen (full color) in the sub-pixel area A; in the T2 stage, it is the sub-pixel area B to form a white screen. (full color) red light; in the T3 stage, it is the red light that constitutes a white screen (full color) in the sub-pixel area C.

For the image light emitted by the sub-pixel G2: in the T1 stage, it is the green light that forms a white screen (full color) in the sub-pixel area B; in the T2 stage, it is the green light that forms a white screen (full color) in the sub-pixel area C ; In the T3 stage, it is the green light that constitutes a white screen (full color) in the sub-pixel area D.

For the image light emitted by the sub-pixel B2: in the T1 stage, it is the blue light that constitutes a white picture (full color) in the sub-pixel region C; in the T2 stage, it is the blue light that constitutes a white picture (full color) in the sub-pixel region D; Stage T3 is the blue light that constitutes a white screen (full color) in the sub-pixel area E.

To sum up, by moving the spatial light modulator 12 at different time stages in one frame of image, any sub-pixel unit of the projection system can realize white light display in space, which further enables the image resolution of the projection system in the target projection area. rate increased to 3 times the original.

To sum up, for “in any frame of image, each sub-pixel unit can spatially display white light” in this application, it can be understood that a frame of image includes a period, and within a period, the spatial light modulator 12 can be Or the image light emitted by the spatial light modulator 12 moves N times, so that the image light emitted by the sub-pixel units included in the spatial light modulator moves N times, and then the target imaging area corresponding to each sub-pixel unit is N times of different sub-pixel images. Superposition, that is, through N times of movement, the target imaging area corresponding to each sub-pixel unit can realize white light display, that is, each sub-pixel unit can display white light in space. Compared with the existing spatial light modulator solution in which multiple sub-pixel units are combined into one pixel unit, the present application uses a low-resolution spatial light modulator to achieve high-resolution image display, which greatly saves costs. 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 a plurality of pixel units 121 are located in the display area. As shown in FIG. 4 , when the spatial light modulator 12 is moved, for a circle of pixel units 121 in the display area closest to the peripheral area, after a period of movement, N−1 sub-pixel units 101 are removed from each pixel unit 121 The emitted light of any color cannot form a new pixel unit 121 . However, considering that a circle of pixel units 121 in the display area closest to the peripheral area is very small in number for all pixel units 121 in the spatial light modulator 12, and a circle of pixel units 121 in the display area closest to the peripheral area may be It is the dummy part covered by BM, so even if the light emitted from N-1 sub-pixel units 101 in each pixel unit 121 cannot form a new pixel unit 121, it will not affect the display of the spatial light modulator 12. screen.

In some embodiments, in the foregoing embodiments, one frame of image is composed of sub-images displayed by multiple sub-frames. Under the condition that the refresh frequency corresponding to one frame of image is constant, the higher the refresh frequency of each sub-frame, the better the visual acuity of the user. the better. Therefore, optionally, the number of unidirectional movements of light of any color emitted by the spatial light modulator 12 in one period is 3 times. In this way, the refresh rate of each frame can reach 1/3 of the total refresh rate of one frame.

Here, the LTPS liquid crystal display panel can be used to ensure that the refresh frequency of each sub-frame is 60 Hz, so that the refresh frequency of each frame of image is 180 Hz.

In some embodiments, as shown in FIG. 4 , the shape of the orthographic projection of the sub-pixel unit 101 on the light source 11 may be a rectangular row, and the short side of the rectangle is consistent 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 also be separately fixed in the projection system 10 . If the light source 11 and the spatial light modulator 12 are fixedly connected to each other, when the spatial light modulator 12 is moved, the light source 11 is also moved by the same displacement in the same direction. If the light source 11 and the spatial light modulator 12 are separately fixed in the projection system 10, only the spatial light modulator 12 moves.

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

In some embodiments, the microactuator may be a stepping piezoelectric ceramic microactuator or a stepping voice coil motor. Wherein, under the condition of applying voltage, the stepping piezoelectric ceramic micro-actuator can produce deformation in the longitudinal direction, thereby driving the spatial light modulator 12 to move linearly. The stepping voice coil motor is a DC servo motor that can convert electrical signals into linear displacement, and can drive the spatial light modulator 12 to move linearly by inputting electrical signals to the stepping voice coil motor.

Here, the stepping piezoelectric ceramic micro-actuator and the stepping voice coil motor have the advantages of simple overall structure, fast driving speed, and high positioning accuracy. Therefore, the embodiment of the present invention can utilize the stepping piezoelectric ceramic micro-actuator and the stepping voice coil motor. The voice coil motor drives the spatial light modulator 12 to move, so that the image light of any color emitted from the spatial light modulator 12 moves in the row direction.

An embodiment of the present invention provides a projection system 10 including a light source 11 , a spatial light modulator, and a displacement structure 13 . While the spatial light modulator 12 is imaging, the displacement structure 13 is used to move the spatial light modulator 12 in the row direction, so that the number of unidirectional movement of the image light of any color emitted from the spatial light modulator 12 in one cycle is N , and the position of the image light of any color emitted by any sub-pixel 101 after moving once is the position of the light emitted by the sub-pixels 101 adjacent to the sub-pixel 101 before the movement. In this way, any sub-pixel 101 can display N sub-pictures in the process of moving in one cycle. After moving in one cycle, every N sub-pictures constitute a new pixel unit 121 that can display a white picture as a whole. Spatially, the number of white light (full color light) pixel units 121 is effectively increased, so that the resolution of the spatial light modulator 12 becomes N times that of the prior art without changing the aperture ratio of the display panel 12 , to avoid the problem of color separation due to too small resolution, which will affect the display effect. At the same time, since the present invention only needs one spatial light modulator 12, and it is not necessary to make the light sources 11 emit light of different colors according to a certain sequence, the present invention does not need to increase the volume and cost of the projection system 10, and does not need to increase the light emission of the light source 11. difficulty.

Embodiment 2

Please refer to FIG. 7 , which shows a projection system 10 according to a second embodiment of the present application. The structure of the projection system 10 in this embodiment is substantially the same as that of the projection system 10 provided in the above-mentioned first embodiment. The length is the same as the length of the short side of the sub-pixel unit 101 whose shape is a rectangle.

An embodiment of the present invention provides a projection system 10, the projection system 10 includes a spatial light modulator 12, the spatial light modulator 12 includes a plurality of sub-pixel units 101, and the shape of the sub-pixel units 101 is square. Compared with the solution in which the sub-pixels 101 are rectangular in shape, more square sub-pixel units 101 can be provided in the spatial light modulator 12 of this embodiment. For example, the aspect ratio of the rectangular sub-pixels 101 is usually 3:1. When the size of the spatial light modulator 12 is constant, the number of the square sub-pixels 101 is equal to the number of the rectangular sub-pixels 101 . three times. That is, in the case of obtaining the same resolution as the aforementioned first embodiment, the number of sub-pixel units 101 required to be controlled in this embodiment is only one-third of the number of sub-pixel units 101 required to be controlled in the first embodiment one.

Embodiment 3

Please refer to FIG. 8 , which shows a projection system 10 according to a third embodiment of the present application. The structure of the projection system 10 in this embodiment is substantially the same as that of the projection system 10 provided in the above-mentioned first and second embodiments, and the main difference is that the displacement structure 13 is a beam deflector, and the beam deflector is arranged in a space from a On the optical path of the image light emitted from the light modulator 12, the beam deflector is used to deflect the image light, instead of the displacement 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 the sub-pixel unit 101 can be deflected along the row direction by utilizing the principle of refraction of light. The acousto-optic deflector can change the angle of the laser according to the acousto-optic interaction mechanism.

An embodiment of the present invention provides a projection system 10 , including a light source 11 , a spatial light modulator 12 , and a displacement structure 13 . While the spatial light modulator 12 is displaying, the image light emitted from the spatial light modulator 12 is deflected along the row direction by the displacement structure 13, so that the image light of any color emitted from the spatial light modulator 12 in one cycle The number of unidirectional movements is N, and the position where the light of any color emitted by any sub-pixel unit 101 moves once is the position of the light emitted by the sub-pixel unit 101 adjacent to the sub-pixel unit 101 before the movement. location. In this way, in the projection target imaging plane, the sub-pixel area corresponding to any sub-pixel 101 can display N sub-pictures in the process of moving within one cycle. The new pixel unit 121 that displays a white picture effectively increases the number of pixel units 121 in the projection target imaging plane in space, so that the spatial light modulator 12 can be adjusted without changing the aperture ratio of the spatial light modulator 12. The resolution becomes N times that of the prior art, which avoids the problem of color separation due to too small resolution, which affects the display effect. At the same time, since the present invention only needs one spatial light modulator 12, and it is not necessary to make the light sources 11 emit light of different colors according to a certain sequence, the present invention does not need to increase the volume and cost of the projection system 10, and does not need to increase the light emission of the light source 11. difficulty.

Embodiment 4

Please refer to FIG. 9 and FIG. 10 , which show a projection system 10 according to a fourth embodiment of the present application. The structure of the projection system 10 in this embodiment is substantially the same as that of the projection system 10 provided by the first embodiment, the second embodiment, and the third embodiment. The main difference is that the light emitted by the light source 11 is white light, and the space The light modulator 12 also includes a color filter layer 17 located on the optical path of the image light. The color filter layer 17 filters at least the white light emitted by the light source 11 into three primary colors; the displacement structure 13 is a micro-actuator, and the micro-actuator is used for multiple The images displayed by the sub-pixel units 101 are moved, so that in any frame of images, each sub-pixel unit 101 can spatially display white light.

Here, the color filter layer 17 includes a plurality of filter units, and each sub-pixel unit 101 corresponds to one filter unit after each movement of the color filter layer 17 .

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

For example, the material of the color filter layer 17 may include dyes. Alternatively, the color filter layer 17 is composed of a plurality of alternating first insulating films and second insulating films, and the filtering effect is realized by utilizing the coherence principle. The refractive index of the first insulating film is different from that of the second insulating film.

In some embodiments, the color filter layer 17 can be integrated on the spatial light modulator 12; alternatively, the color filter layer 17 can also be independently formed outside the spatial light modulator 12, and the upper polarizer 16 is located away from the spatial light modulator 12 sides.

Optionally, the color filter layer 17 is independently formed outside the spatial light modulator 12 .

In some embodiments, the microactuator may be a stepping piezoelectric ceramic microactuator or a stepping voice coil motor. Wherein, under the condition of applying voltage, the stepping piezoelectric ceramic micro-actuator can produce deformation in the longitudinal direction, thereby driving the color filter layer 17 to move linearly. The stepping voice coil motor is a DC servo motor that can convert electrical signals into linear displacement, and can drive the color filter layer 17 to move linearly by inputting electrical signals to the stepping voice coil motor.

Here, the stepping piezoelectric ceramic micro-actuator and the stepping voice coil motor have the advantages of simple overall structure, fast driving speed, and high positioning accuracy. Therefore, the embodiment of the present invention can utilize the stepping piezoelectric ceramic micro-actuator and the stepping voice coil motor. The voice coil motor drives the color 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 of image includes one period, within one period, the color filter layer 17 can be moved to the left N times; or, the color filter layer 17 can be moved to the right N times.

As an example, as shown in FIG. 10 , the shadow system 10 includes a plurality of fixed sub-pixel regions, and the pixel unit 121 includes red sub-pixels R1, green sub-pixels G1, and blue sub-pixels B1 arranged in sequence from left to right. For example, in the process of displaying one frame of image, the displacement structure 13 controls the color filter layer 17 to move to the right three times, which are the first stage T1, the second stage T2, and the third stage T3 respectively.

As shown in FIG. 10 , taking the sub-pixel region A where the image light emitted from the red sub-pixel R1 is located in the T0 stage as an example, in the sub-pixel region A, the image light emitted from the blue sub-pixel B2 in the T1 stage, the image light emitted from the blue sub-pixel B2 in the T2 stage The image light emitted by the green sub-pixel G2 and the image light emitted from the red sub-pixel R2 in the T3 stage constitute a new pixel unit A in the sub-pixel area A that can display a white image (full color) as a whole, that is, The sub-pixel area A corresponding to the new pixel unit A can display a white picture.

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

As shown in FIG. 10 , taking the sub-pixel region C where the image light emitted from the blue sub-pixel B1 is located in the T0 stage as an example, in the sub-pixel region C, the image light emitted from the green sub-pixel G1 in the T1 stage and the image light emitted from the green sub-pixel G1 in the T2 stage are The image light emitted by the red sub-pixel R2 and the image light emitted from the blue sub-pixel B2 in the T3 stage constitute a new pixel unit C in the sub-pixel area C that can display a white image (full color) as a whole, That is, the sub-pixel area C corresponding to the new pixel unit C can display a white picture.

To sum up, by moving the color filter layer 17 at different time stages in one frame of image, any sub-pixel area of the projection system 10 can realize white light display, which further improves the image resolution of the projection system 10 in the target projection area. increased to 3 times the original.

An embodiment of the present invention provides a projection system 10 , including a light source 11 , a spatial light modulator 12 , and a displacement structure 13 . While the spatial light modulator 12 is displaying, the color filter layer 17 is moved along the row direction by the displacement structure 13, so that the number of unidirectional movements of light of any color emitted from the spatial light modulator 12 in one cycle is N, And the position of the image light of any color emitted by any sub-pixel unit 101 after moving once is the position of the image light emitted by the sub-pixels 101 adjacent to the sub-pixel unit 101 before the movement. In this way, any sub-pixel unit 101 can display N sub-pictures in the process of moving in one cycle. After moving in one cycle, every N sub-pictures constitute a new pixel unit 121 that can display a white picture as a whole. In space, the number of pixel units 121 is effectively increased, 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 spatial light modulator 12, avoiding the If the resolution is too small, there is a problem of color separation, which affects the display effect. At the same time, since the present invention only needs one spatial light modulator 12, and it is not necessary to make the light sources 11 emit different colors of display light according to a certain sequence, the present invention does not need to increase the volume and cost of the projection system 10, and does not need to increase the size of the light source 11. Luminous difficulty.

Embodiment 5

An embodiment of the present invention further provides a projection device, as shown in FIG. 11 , which includes a lens module 20 and the projection system 10 described in any of the foregoing embodiments.

The working process of the projection device is as follows: the image light emitted from the spatial light modulator 10 is enlarged by the lens module 20 and projected on the object to be projected.

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

The explanation about the projection device in the projection device of the embodiment of the present invention is the same as the explanation of the projection system 10 in the foregoing embodiment, and will not be repeated here.

Optionally, the projection device further includes a controller for controlling the displacement structure 13 while the spatial light modulator 12 is displaying, so as to move the images displayed by the multiple sub-pixel units 101 of the spatial light modulator 12, so that in any one In a frame image, each sub-pixel unit 101 can spatially display white light.

In some embodiments, as long as the controller can control the displacement structure 13 , this embodiment of the present invention does not make any special limitation on this. By way of example, the controller may be a control circuit.

In the embodiment of the present invention, the controller can be used to control the displacement structure 13. When the spatial light modulator 12 displays a picture, the control displacement structure 13 can control the unidirectional movement of the image light of any color emitted from the spatial light modulator 12; When the spatial light modulator 12 does not display a picture, the control displacement structure 13 stops working.

An embodiment of the present invention provides a projection apparatus, including the projection system 10 described in any of the foregoing embodiments. The projection system 10 includes a light source 11 , a spatial light modulator 12 , and a displacement structure 13 . The beneficial effects of the projection device are the same as those of the aforementioned projection system 10 , which will not be repeated here.

Embodiment 6

An embodiment of the present invention further provides a method for controlling a projection device as described in the fifth embodiment, including: controlling the displacement structure 13 while the spatial light modulator 12 is displaying, so as to control a plurality of sub-pixel units of the spatial light modulator 12 The image displayed by 101 is moved, so that in any frame of image, each sub-pixel unit 101 can spatially display white light.

An embodiment of the present invention provides a method for controlling a projection device, the explanation and beneficial effects of which are the same as those of the aforementioned projection device, and are not repeated here.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

A projection system is characterized by 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 disposed on the optical path of the display light emitted from the light source, and the spatial light modulator is used for modulating the display light emitted from the light source to emit image light;

The spatial light modulator includes a plurality of pixel units arranged in an array, and each of the pixel units includes a plurality of sub-pixel units;

The displacement structure is used to move the image displayed by the plurality of sub-pixel units of the spatial light modulator, so that in any frame of image, each sub-pixel unit can spatially display white light.
The projection system according to claim 1, wherein the displacement structure is a micro-actuator, and the micro-actuator is used to move the spatial light modulator, so as to adjust the plurality of components included in the spatial light modulator. The image displayed by the sub-pixel unit is moved.
The projection system according to claim 1, wherein the displacement structure is a beam deflector, and the beam deflector is arranged on the optical path of the image light emitted by the spatial light modulator; the beam deflector is used for The image displayed by the plurality of sub-pixel units included in the spatial light modulator is moved.
The projection system of claim 3, wherein the beam deflector comprises a glass lens or an acousto-optic deflector.
The projection system according to claim 2, wherein the spatial light modulator further comprises a color filter layer, the color filter layer at least filters the display light into three primary colors;

The micro-actuator is used for moving the color filter layer to move the images displayed by the plurality of sub-pixel units.
The projection system according to claim 2 or 5, wherein the micro-actuator comprises a stepping piezoelectric ceramic micro-actuator or a stepping voice coil motor.
The projection system according to any one of claims 1-5, wherein the pixel unit of the spatial light modulator comprises a red sub-pixel unit, a green sub-pixel unit and a blue sub-pixel unit arranged in sequence;

In displaying a frame of image, the displacement structure is used to move the image light emitted by the red sub-pixel unit, the green sub-pixel unit and the blue sub-pixel unit three times in the same direction, so that the red sub-pixel unit, Any one of the green sub-pixel unit and the blue sub-pixel unit can spatially display white light.
The projection system according to any one of claims 1-5, wherein the image light spot emitted by the sub-pixel unit is a square or a rectangle.
A projection device, characterized by comprising a lens module and the projection system according to any one of claims 1-8.
The projection device according to claim 9, characterized in that, the projection device further comprises a controller for controlling the displacement structure when the spatial light modulator displays, so as to display the data displayed on the plurality of sub-pixel units of the spatial light modulator. The image is moved so that in any frame of image, each sub-pixel unit can spatially display white light.