WO2021175341A1 - Display module having multiple backlight light sources - Google Patents

Abstract

A display module having multiple backlight light sources, comprising a sequential line light-source array (110)/sequential point light-source array (120), a display device (20), a convergence device (30), a light path guide device (40), and a control device (60); the sequential line light-source array (110)/sequential point light-source array (120) comprises more than one line light source/point light source, each line light source/point light source is switched on and off sequentially in each cycle period, and only one line light source/point light source is turned on at any one time point. By way of the convergence device (30), the light emitted by each light source is converged to the area where the pupil (50) of an observer is located; the display device (20) loads two-dimensional projection image information of a scene to be displayed; under the guidance of the light path guide device (40), and a time sequence projection display device (20) loads the two-dimensional projection image information to the area where the pupil (50) of the observer is located. The design of the spatial distribution of the light sources is such that the display device (20) projects one or at least two image information of the scene to be displayed into the pupil (50) of the observer in each cycle period, and on the basis of Maxwell projection or monocular multi-imaging, achieves three-dimensional display which overcomes the vergence–accommodation conflict.

Description

Display module with multiple backlight light sources Technical field

The present invention relates to the field of three-dimensional display technology, and more specifically to a display module with multiple backlight sources.

Background technique

Compared with the traditional two-dimensional display, the three-dimensional display can provide more dimensional information and is receiving more and more attention. The existing three-dimensional display technology mainly uses the principle of binocular parallax to project a corresponding two-dimensional image to the observer's binoculars, and stimulate the depth perception of the brain through the cross of binocular viewing directions to realize the presentation of three-dimensional vision. In order to see the corresponding two-dimensional image clearly, each eye needs to always focus on the display surface, and the binocular viewing direction needs to cross the display scene out of the screen to realize depth perception. The depth of focus and binocular convergence are inconsistent. Under natural circumstances, when an observer observes a real three-dimensional scene, the monocular focus depth and binocular convergence depth are consistent with the spatial depth of the observer's focus. Therefore, traditional optical devices that only realize 3D display based on binocular parallax have inherent focus-convergence conflicts that are contrary to the natural evolutionary physiological habits of the human body, resulting in visual discomfort for the observer, which is currently a bottleneck hindering the promotion and application of 3D display technology. Sexual issues.

Multi-images per eye (PCT/CN2017/080874, THREE-DIMENTIONAL DISPLAY SYSTEM BASED ON DIVISION MULTIPLEXING OF VIEWER'S ENTRANCE-PUPIL AND DISPLAY MEHOD) and Maxwell projection method (maxwellian view) (US2019/0204600, INT WITH RRTIC view) There are two technical paths that can solve the problem of focus-convergence conflict. In the former, the display device projects at least two two-dimensional images of the scene to be displayed to each eye of the observer, so as to realize that at least two light beams enter the pupil of the observer through each display object point, and the at least two light beams are spatially superimposed to form a light spot. The light intensity distribution at the superimposed spot has sufficient traction capability within a certain depth range, and can draw the observer's eyes to freely focus on the superimposed spot, and overcome the above-mentioned focus-convergence conflict problem. In the latter, each pixel projects a light beam with a small divergence to the observer’s eye, and the light beam has a small change in light intensity along the transmission direction. Therefore, within a certain depth range on the transmission path, the light beam has a small divergence. The light intensity distribution has little difference in the traction ability of the observer's monocular focus, then the binocular convergence can lead the observer's monocular to freely focus on the binocular convergence depth within this depth range, to achieve the monocular focus depth and the binocular convergence depth Unanimous.

Summary of the invention

The present invention provides a display module with multiple backlight light sources, which includes a sequential line light source array or a sequential point light source array, a display device, a convergence device, a light path guiding device, and a control device. The display module with multiple backlight sources may also include other components. The sequential line light source array includes more than one line light source, and each line light source is switched on and off sequentially in each cycle formed by adjacent time points, and only one line light source is turned on at a time point; wherein the sequential point light source array includes more than one line light source. For one point light source, each point light source is switched on and off sequentially in each cycle formed by adjacent time points, and only one point light source is turned on at a time point. Each line light source or each point light source is formed into a convergent image of the line light source or point light source through the converging device or converging device and other components. The display device is placed on the transmission path of the light emitted by each line light source or each point light source, and the scene to be displayed is loaded. The image information, under the guidance of the light path guiding device, sequentially projects the image of the scene to be displayed loaded by the display device to the area where the pupil of the observer is located. Design the spatial distribution of each line light source or point light source so that the display device projects one or at least two image information of the scene to be displayed into the pupil of the observer in each cycle, and overcomes the focus-convergence conflict based on Maxwell projection or monocular multi-image Three-dimensional display. This patent introduces line light sources. Compared with the two-dimensional distribution requirements for point light sources in the two-dimensional viewing area, the one-dimensionally distributed line light sources can realize the two-dimensional viewing area, which reduces the requirements for the frame rate of the display device; this patent also introduces The sub-light source with orthogonal characteristics can increase the number of two-dimensional projected images that the module can project by sacrificing resolution. The display module with multiple backlight sources can be used alone as a binocular three-dimensional display optical engine, or can be used as an eyepiece, using two of the modules to build a binocular three-dimensional display optical engine.

In order to overcome the focus-convergence conflict and introduce a timing light source as a timing backlight source, and realize a monocular freely focusable display based on monocular multi-image or/and Maxwell projection method, the present invention provides the following solutions:

A display module with multiple backlight sources includes:

The sequential line light source array includes M line light sources arranged in a one-dimensional direction, which are turned on sequentially in each cycle composed of M adjacent time points, and only one line light source is turned on at a time point, where M≧2;

The display device includes a plurality of pixels, which are located at positions corresponding to the sequential line light source array and use projection light from the sequential line light source array as a backlight, and load and project light information;

Convergence device, used to modulate the display device to load light information, and guide the projection beam of each pixel to converge and transmit;

A light path guiding device is placed on the transmission path of the light emitted from the time series line light source array, and guides the light from the time series line light source array to enter the display device or/and guide the light information from the display device to enter the area where the pupil of the observer is located ；

The control device is respectively connected to the sequential line light source array and the display device, and is used to control each cycle composed of M line light sources of the sequential line light source array at adjacent M time points, each time point only has one Turn on the ground in turn, and synchronously load the corresponding light information to each pixel of the display device;

The display module with multiple backlight sources is set so that the light information loaded by each pixel of the display device is along the sagittal direction of the light beam from the pixel that enters the area where the pupil of the observer is located, and the scene to be displayed is in the sagittal direction and The projection information on the intersection of the observer’s pupil.

Further, each pixel of the display device projects at least two light beams to the pupil of the observer in each cycle period and time sequence.

Further, the display module with multiple backlight light sources further includes a front converging device, which is placed between the sequential line light source array and the display device to adjust the divergence of incident light from the display device.

Further, the display module with multiple backlight sources further includes a tracking device connected to the control device for real-time tracking and determining the spatial position of the observer's pupil.

Further, the control device is configured to be able to select K out of the M line light sources of the sequential line light source array as effective line light sources in real time according to the spatial position of the pupil, and the control device can control the K effective line light sources to be in adjacent K light sources. The time sequence switch works in each effective cycle composed of two time points, and refreshes each pixel of the display device with corresponding light information synchronously, where M﹥K≧2.

Further, each line light source of the sequential line light source array is composed of L sub-line light sources with orthogonal characteristics, and each line light source is turned on (that is, the corresponding L orthogonal characteristic sub-line light sources are turned on), and the display device Among the pixels in at least one direction, pixels separated by (L-1) pixels are respectively grouped, and the pixels of the display device form L orthogonal characteristic pixel groups, where L≧2;

Wherein, the L orthogonal characteristic sub-line light sources of each line light source correspond to the L orthogonal characteristics one-to-one, and each orthogonal characteristic sub-line light source only emits light corresponding to the orthogonal characteristic; the L orthogonal characteristic pixel groups and The L orthogonal characteristic sub-line light sources of each line light source are in one-to-one correspondence, and the pixels of each orthogonal characteristic pixel group only allow the projection light of the corresponding orthogonal characteristic sub-line light source to enter, be modulated and emitted, and the non-corresponding orthogonal characteristic sub-line light source is cut off. Line light source projecting light;

The display module with multiple backlight sources is characterized in that the number of light beams incident on the pupil of the observer in each cycle period is at least equal to the number of pixels included in two orthogonal characteristic pixel groups.

Further, the display module with multiple backlight sources further includes a tracking device connected to the control device for real-time tracking and determining the spatial position of the observer's pupil;

The control device is set to be able to select K line light sources whose projected light enters the observer’s pupil in real time according to the spatial position of the observer’s pupil as the effective line light source, and the control device can control the composition of the K effective line light sources at adjacent K time points. The time sequence switch in each effective cycle period of, and the corresponding light information refreshes the pixels of the display device synchronously, where M﹥K≧2.

Further, the display module with multiple backlight light sources further includes a tracking device connected to the control device to track and determine the spatial position of the observer's pupil in real time;

The control device is set to be able to select a line light source whose projected light enters the observer’s pupil as an effective line light source in real time according to the spatial position of the observer’s pupil at each time point. The control device can control the L positive line light sources of the effective line light source. The cross-characteristic sub-line light source is turned on at this point in time, and the pixels of the display device are refreshed synchronously with corresponding light information.

The present invention also provides another solution.

A display module with multiple backlight light sources includes:

The sequential point light source array includes M point light sources, which are turned on sequentially in each cycle composed of M adjacent time points, and only one point light source is turned on at a time point, where M≧2;

Among them, each point light source is composed of L orthogonal characteristic sub-point light sources, each point light source is turned on (that is, its corresponding L orthogonal characteristic sub-point light sources are turned on), and the L orthogonal characteristic sub-point light sources and L kinds of sub-point light sources are turned on. Orthogonal characteristics correspond one-to-one, and each orthogonal characteristic sub-point light source only projects the light corresponding to the orthogonal characteristic, where L≧2;

The display device includes a plurality of pixels, which are located at positions corresponding to the time-series line light source array and use the projection light from the time-series point light source array as backlight, load and project light information, and the pixels are spaced in at least one direction (L- 1) Pixels of each pixel are grouped separately to form L orthogonal characteristic pixel groups;

Among them, the L orthogonal characteristic pixel groups of the display device correspond to the L orthogonal characteristic sub-point light sources of each point light source respectively, and the pixels of each pixel group only allow the light projected by the corresponding orthogonal characteristic sub-point light sources to enter and be Modulate and emit, cut off the light projected by other non-corresponding orthogonal characteristic sub-point light sources;

Convergence device, modulates the display device to load light information, and guides the projection beam of each pixel to converge and transmit;

A light path guiding device is placed on the transmission path of the light emitting path of the time sequence point light source array, and guides the light from the time sequence point light source array to enter the display device or/and guide the light from the display device to enter the area where the pupil of the observer is located ；

The control device is respectively connected to the time sequence point light source array and the display device, and is used to control the M point light sources of the time sequence point light source array in each cycle composed of M adjacent time points, and there is only one time point at a time Turn on the ground in turn, and synchronously load the corresponding light information to each pixel of the display device;

The display module with multiple backlight sources is set so that the light information loaded by each pixel of the display device is along the sagittal direction of the light beam from the pixel that enters the area where the pupil of the observer is located, and the scene to be displayed is in the sagittal direction and The projection information on the intersection of the observer’s pupil, and in each cycle, the number of beams incident on the observer’s pupil is at least equal to the number of pixels included in an orthogonal characteristic pixel group.

Further, the display module with multiple backlight light sources further includes a front converging device, which is placed between the sequential point light source array and the display device, and is used to adjust the divergence of incident light from the display device.

Further, the display module with multiple backlight sources further includes a tracking device connected to the control device for real-time tracking and determining the spatial position of the observer's pupil;

The control device is set to be able to select K point light sources whose projected light enters the observer’s pupil in real time as effective point light sources according to the spatial position of the observer’s pupil. The time sequence is switched in each effective cycle period composed of time points, and each pixel of the display device is refreshed in synchronization with the corresponding optical information, where M﹥K≧2.

Further, the display module with multiple backlight sources further includes a tracking device connected to the control device for real-time tracking and determining the spatial position of the observer's pupil;

The control device is set to be able to select a point light source whose projected light enters the observer’s pupil as an effective point light source in real time according to the spatial position of the observer’s pupil at each time point, and the control device can control L of the effective point light sources. The orthogonal characteristic sub-point light source is turned on at this point in time, and each pixel of the display device is refreshed synchronously with corresponding light information.

The present invention has the following technical effects: the present invention uses a light source that is turned on sequentially as a backlight, loads different two-dimensional projected images of the display target scene, and is guided by the light path guide device to the area where the observer’s pupil is located. The construction can be based on monocular multi-image or / Display module for displaying with Maxwell projection. The design of the line light source alleviates the excessively high requirements for the number of light sources in the two-dimensional viewing area, and the design of the orthogonal characteristic sub-light source uses spatial multiplexing to increase the number of images of the scene to be displayed. The present invention is a display module with multiple backlight sources, based on monocular multiple images or/and Maxwell projection for three-dimensional display without focus-convergence conflict.

The details of the embodiments of the present invention are embodied in the drawings or the following description. Other characteristics, objects and advantages of the present invention will become more apparent through the following description and the accompanying drawings.

Description of the drawings

The drawings are used to help better understand the present invention and are also part of this specification. The drawings and descriptions illustrating the embodiments are used to explain the principle of the present invention.

FIG. 1 is a schematic diagram of the optical structure of a display module using a sequential line light source array.

Fig. 2 is another schematic diagram of the positional relationship between the display device and the converging device when a line light source is used.

Fig. 3 is a schematic diagram showing the structure of a display module incorporating a front converging device when a line light source is used.

4 is a schematic diagram of a display module with line light sources staggered and arranged along the transmission direction of the emitted light.

Fig. 5 is another example of the light path guiding device when a line light source is used.

Fig. 6 is another example 2 of the light path guiding device when a line light source is used.

Fig. 7 is another example three of the optical path guiding device when a line light source is used.

Fig. 8 is another example 4 of the optical path guiding device when a line light source is used.

FIG. 9 is a schematic diagram of an example of a display module incorporating orthogonal characteristic sub-line light sources.

FIG. 10 is a schematic diagram of another pixel arrangement of the orthogonal characteristic pixel group.

FIG. 11 is a schematic diagram of the optical structure of a display module using a sequential point light source array.

Fig. 12 is another positional relationship between the display device and the converging device when the orthogonal characteristic sub-point light source is used.

FIG. 13 is a schematic diagram of the structure of a display module incorporating a front convergent device when the orthogonal characteristic sub-point light source is adopted.

14 is a schematic diagram of a display module with orthogonal characteristic sub-point light sources staggered and arranged along the transmission direction of the emitted light.

Fig. 15 is another example of the light path guiding device when a point light source is used.

Fig. 16 is another example 2 of the light path guiding device when a point light source is used.

Fig. 17 is another example 3 of the light path guiding device when a point light source is used.

Detailed ways

The present invention is a display module with multiple backlight light sources. By introducing sequential light sources as the backlight of the display device, multiple two-dimensional projection images of the scene to be displayed are projected to the area where the observer’s pupil is located along different sagittal directions, based on monocular multi-image or / And Maxwell projection to achieve a three-dimensional display of non-focus-convergence conflict.

Example 1

A display module with multiple backlight sources of this patent includes a sequential line light source array 110, a display device 20, a convergence device 30, a light path guiding device 40, and a control device 60. The display module with multiple backlight sources may also include other components. The sequential line light source array 110 includes more than one line light sources, and each line light source is switched on and off sequentially in each cycle formed by adjacent time points, and only one line light source is turned on at a time point. The light emitted from each line light source is converged to the corresponding convergent image through the converging device 30 or the converging device 30 and other components. The display device 20 is placed on the light transmission path of the line light source array 110, and loads the two-dimensional projected image information of the scene to be displayed. Under the guidance of the light path guide device 40, it is projected to the pupil 50 of the observer near the convergent image of the line light source. area. The display device 20 is designed to project at least two image information of the scene to be displayed into the pupil of the observer in each cycle, and realize a three-dimensional display that overcomes the focus-convergence conflict based on the single-eye multi-image.

Figure 1 shows the basic structure of a display module using a line light source, including a timing line light source array 110, a display device 20, a convergence device 30, a light path guiding device 40, and a control device 60. The control device 60 is connected to the timing line. The light source array 110 is connected to the display device 20. Wherein, the sequential line light source array 110 includes M≧2 line light sources. The light emitted by the M line light sources is condensed toward the corresponding convergent image by the condensing device 30. Figure 1 takes M=3 as an example. M=3 z-direction line light sources LS ₁ , LS ₂ , and LS ₃ are arranged along the y direction, and the light emitted by the converging device 30 is respectively converged to the corresponding convergent images I _LS1 , I _LS2 , and I _LS3 . The display device 20 uses the light projected by each line light source as a backlight, is placed on the transmission path of the light projected by the sequential line light source array 110, and modulates, loads and projects light information. The light path guiding device 40 may be a single device or may include multiple components, and is placed on the propagation path of the light projected by the sequential line light source array 110 to guide the display device 20 to project light information into the area where the pupil 50 of the observer is located. In the module shown in FIG. 1, the light path guiding device 40 includes three reflecting surfaces 401a, 401b, and 401c, which are respectively placed at the convergent images I _LS1 , I _LS2 , and I _LS3 corresponding to M=3 line light sources. In each cycle composed of adjacent M=3 time points, each line light source is controlled by the control device 60 and timed on and off, and at one time point, only one line light source is turned on. Specifically, at time point t, only the line light source LS _{1 is} turned on, _{and both LS 2} and LS ₃ are turned off. The light _{projected by the line light source LS 1} is modulated by the display device 20, and the light information is projected to the convergence of the _{line light source LS 1 via the converging device 30.} The image I _{LS1 is then reflected by the reflecting surface 401a at the convergent image I LS1} of the line light source, and propagates to the area where the pupil 50 of the observer is located; at the time point t+Δt/3, only the line light source LS _{2 is} turned on, LS ₁ and LS ₃ are all turned off, the light _{projected by the line light source LS 2} is modulated by the display device 20, and the light information is projected to the convergent image I _{LS2 of the line light source LS 2} through the converging device 30, and then is reflected by the reflective surface 401b at the _{convergent image I LS2.} The area where the pupil 50 of the observer is spread; and so on. At each point in time, the light information loaded by each pixel of the display device 20 is along the sagittal direction of the light beam projected by the pixel and incident on the area where the pupil 50 of the observer is located. The projection information at the intersection point of each pixel, and the information loaded by each pixel, constitute a two-dimensional projection image of the scene to be displayed. Then, in one cycle, M=3 two-dimensional projection images with the scene to be displayed are projected to the area where the pupil 50 of the observer is located. When the distance between the convergent images of adjacent line light sources is less than a certain value, the pupil 50 of the observer can receive at least two two-dimensional projected images from the display device 20. Then, after one display object point, at least two light beams enter the pupil 50 of the observer, so that a three-dimensional display without focus-convergence conflict is realized based on the monocular multi-image. In the above process, the pupil 50 of the observer may not be able to receive all the light beams corresponding to at least two complete two-dimensional projected images, for example, when the convergent image deviates from the line light source far away. In fact, different parts of different two-dimensional projected images can be spliced together to form a spliced two-dimensional projected image. The number of pixels contained in this type of split two-dimensional projected image is equal to the number of pixels of the two-dimensional projected image, and its pixel distribution range is consistent with the pixel distribution range of the two-dimensional projected image. To perform monocular multi-image display, it is required to project at least two images of the scene to be displayed into the pupil 50 of the observer in one cycle. The two images may be two-dimensional projected images, or a split-type two-dimensional projected image. In other words, it is required that in each cycle period, each pixel of the display device 20 projects at least two light beams to enter the pupil 50 of the observer under the condition that corresponding light information is loaded.

Using a line light source as a backlight, the light beam emitted from each pixel of the display device 20 is a one-dimensional diverging light, and there is a diverging surface corresponding to the line direction of the line light source. The spatial orientation of the emitting surface may change with the transmission of the light beam, but the emitting surface is uniformly present. The beam vector in the above "At each point in time, the light information loaded by each pixel of the display device 20 is along the sagittal direction of the beam projected by the pixel and incident on the area where the pupil 50 of the observer is located", in the beam divergence plane, It is often set to point to a position where the pupil 50 of the observer often appears. Alternatively, a tracking device 80 is introduced, which is connected to the control device 60 to determine the position of the pupil 50 of the observer in real time, and set the sagittal direction of the light beam emitted by each pixel in real time to point to the real-time position of the pupil 50 of the observer in its divergence plane.

When the converging device 30 is placed in front of the display device 20 along the light beam transmission direction, the modulation function of the converging device 30 also appears as an enlarged virtual image of the display device 20. In addition, along the light beam transmission direction, the display device 20 can also be placed in front of the converging device 30, as shown in FIG. 2. In a display module with multiple backlight sources of this patent, a front convergent device 70 can be introduced between the sequential line light source array 110 and the display device 20 to modulate the divergence of each line light source when the backlight is incident on the display device 20. In FIG. 3, the front converging device 70 takes a lens as an example, and each line light source is placed on the front focal plane of the front converging device 70. The light-emitting points on each light source project parallel light beams into the display device 20 through the front converging device 70. In fact, the position of each line light source and the front converging device 70 can also be such that the luminous points on each line light source emit light, which enters the display device 20 in a divergent state or a convergent state through the front converging device 70. Further, each line light source can also be placed in a staggered position along the transmission direction of the projected light, as shown in FIG. 4.

The light path guiding device 40 is used to adjust the light beam transmission path of the display module described in this patent to make it suitable for various application environments. For example, in the above figures, the reflective surface where the convergent image of each line light source is placed is a component of the light path guide device 40, which is consistent with the strip shape of the convergent image of the line light source, and can allow passing through the gap between the reflective surfaces. Receive external ambient light information. In addition, the size and position of each reflecting surface are reasonably designed, and it can also play a low-pass or band-pass filter function. If there is no need for external ambient light applications, in the above figures, the multiple reflective surfaces where the line light sources converge can be removed or replaced with a whole reflective surface, and the integral reflective surface can deviate from the convergent image of the line light sources place. At this time, the pupil 50 of the observer can be designed to be placed at the convergent image of the line light source, or even closer to the convergent device 30. Further, the optical path guiding device 40 can be designed in a variety of other different structures, as shown in the examples shown in Figs. 5 to 8. In FIG. 5, adding the component reflection surface 402 to the light path guiding device 40 is more conducive to the compactness of the display module structure. FIG. 6 shows an optical path structure using a reflective display device 20. As shown in FIG. The optical path guiding device 40 is composed of a polarizer 403, a polarization beam splitting surface 404, a quarter-wave plate 405, and reflecting surfaces 401a, 401b, 401c, and 401d placed at the convergent image of each orthogonal characteristic sub-line light source. The polarizer 403 polarizes the incident light so that it enters the polarized light splitting surface 404 with the "-" state linearly polarized light and transmits it, and then enters the reflective display device 20 through the quarter wave plate 405 for information loading. The light projected by the reflective display device 20 carries light information and enters the quarter-wave plate 405 for a second time, and is converted into the "·" state linear polarization with the polarization direction and the polarization direction of the "-" state linear polarization perpendicular to each other, and then passes through the polarization splitting surface. 404 reflects and propagates to the converging device 30. Among them, the polarized light splitting surface 404 transmits linearly polarized light in the "-" state and reflects linearly polarized light in the "·" state. Further, the polarized light splitting surface 404 in FIG. 6 is replaced by a semi-transmissive and semi-reversed surface 406, as shown in FIG. 7. In this case, the polarizer 403 and the quarter-wave plate 405 are no longer needed. In FIGS. 5 to 7, the reflective surface placed at the convergent image of each line light source is reserved as a component of the light path guiding device 40, and four are shown as an example. FIG. 8 uses a free-form surface optical component as the guiding device 40, and the converging device 30 is compounded. Among them, the free-form surfaces F3, F2, and F4 are used as components of the guiding device 40, and the free-form surfaces F1, F2, F3, and F4 function as the converging device 30. In addition, the free-form surface F5 eliminates the influence of the free-form surfaces F2 and F4 on the incident light of the external environment, and allows the external environment light and the display scene to enter the pupil 50 of the observer together.

In this embodiment of a display module with multiple backlight light sources using linear light sources, a larger M value is beneficial to obtaining a larger viewing area. However, at the same time, higher requirements are also put on the frame rate of the display device 20. The use of line light sources only needs to consider the expansion of the viewing area along the direction of the line light source arrangement, and the expansion of the viewing area along the other direction does not need to be considered, which can reduce the alignment deviation of the pupil 50 of the observer. The required two-dimensional viewing area is 20 frames for the display device. Rate requirements. In addition, according to the spatial position of the observer’s pupil 50 determined in real time by the tracking device 80, from the M line light sources of the sequential line light source array 110, the control device 60 selects in real time K necessary for realizing monocular multi-images as effective line light sources. , K<M, and controlling the K effective line light sources to switch on and off for display in each effective cycle period composed of adjacent K time points, which can also reduce the requirement for the 20 frame rate of the display device.

When the value of M is large, the light projected by the display device 20 can cover the eyes of the observer, and each eye can receive at least two images of the scene to be displayed, the display module of this patent with multiple backlight sources can be independent As the optical engine of the 3D display system. In addition, a display module with multiple backlight sources of this patent can be used as an eyepiece, only projecting two or more images to one eye of the observer, and using two such modules to build a binocular display system, such as AR /VR, the optical engine.

In the above-mentioned various structures, each line light source of the sequential line light source array 110 may also be composed of L≧2 orthogonal characteristic sub-line light sources, and the L orthogonal characteristic sub-line light sources correspond to L kinds of orthogonal characteristics in a one-to-one correspondence. , Each only emits light with corresponding orthogonal characteristics. At this time, the display device 20 is required to also have orthogonal characteristics: along at least one direction, pixels with an interval of (L-1) pixels are respectively grouped, and the pixels of the display device 20 form a total of L orthogonal characteristic pixel groups. , The L pixel groups correspond to the L orthogonal characteristic sub-line light sources of each line light source respectively. The pixels of each orthogonal characteristic pixel group only allow the projection light of the corresponding orthogonal characteristic sub-line light source to be incident and modulated, and cut off the projection light of other orthogonal characteristic sub-line light sources. The L sub-line light sources with orthogonal characteristics of the same line light source are simultaneously turned on or off at a time point. In this way, at each point in time, the L orthogonal characteristic pixel groups of the display device 20 are equivalent to L display screens, and the L orthogonal characteristic sub-line light sources that are turned on correspondingly and synchronously project the scenes to be displayed independently of each other. L two-dimensional projected images. In contrast, when the orthogonal characteristic sub-line light source design is not adopted, the display device 20 is used as a display screen, and at each time point, only one two-dimensional projection image of the scene to be displayed is projected through the corresponding line light source that is turned on synchronously. . Therefore, the introduction of the orthogonal characteristic sub-line light source increases the number of two-dimensional projected images that can be projected in one cycle to M×L by sacrificing the resolution of the projected two-dimensional projected image. Fig. 9 illustrates the pixel grouping rule of the orthogonal characteristic pixel group and the arrangement of the orthogonal characteristic sub-line light sources by taking M×L=3×2 as an example. The M×L=6 z-direction orthogonal characteristic sub-line light sources are arranged along the one-dimensional y-direction, and L=2 orthogonal characteristics are taken as mutually perpendicular linear polarization states "·" and "-". Specifically, the line light source LS ₁ includes L=2 orthogonal characteristic sub-line light sources LS ₁₁ and LS ₁₂ ; the line light source LS ₂ includes L=2 orthogonal characteristic sub-line light sources LS ₂₁ and LS ₂₂ ; the line light source LS ₃ includes L=2 orthogonal characteristic sub-line light sources LS ₃₁ and LS ₃₂ . Among them, the orthogonal characteristic sub-line light sources LS ₁₁ , LS ₂₁ , and LS ₃₁ only emit "-" orthogonal characteristic light, and the orthogonal characteristic sub-line light sources LS ₁₂ , LS ₂₂ and LS ₃₂ only emit "-" orthogonal characteristic light. Along the y direction, the pixels of the display device 20 with an interval of L-1=1 pixels are grouped, that is, the pixels marked with "·" and "-" in the figure are grouped into groups, forming L=2 orthogonal characteristic pixel groups , Respectively named the "·" state orthogonal characteristic pixel group and the "-" state orthogonal characteristic pixel group, which correspond to allowing only the "·" state light and the "-" state light to enter and modulate them respectively. In the module shown in Fig. 9, the optical path guiding device 40 includes M×L=6 reflecting surfaces 401a, 401b, 401c, 401d, 401e, 401f, and the orthogonal characteristic sub-line light source convergent images I _LS11 , I _LS21 , I _LS31 , I _LS12 , I _LS22 , I _LS32 . In each cycle composed of adjacent M=3 time points, each line light source is controlled by the control device 60 and timed on and off, and at one time point, only one line light source has L=2 orthogonal characteristic sub-line light sources at the same time Was opened. For example, at time t, when only the orthogonal characteristic sub-line light sources LS ₁₁ and LS _{12 are} turned on, the "·" state orthogonal characteristic pixel group uses the _{projection light of the orthogonal characteristic sub-line light source A 12} as the backlight to load and project light information. The "-" state orthogonal characteristic pixel group uses the _{projection light of the orthogonal characteristic sub-line light source A 11} as the backlight to load and project light information, as shown in Figure 9. The light information loaded by each pixel at each time point is the sagittal direction of the light beam projected by the pixel at that time point and incident on the area where the observer’s pupil 50 is located, and the scene to be displayed is at the sagittal direction and where the observer’s pupil 50 is located. The projection information on the intersection of the faces. In one cycle, M×L=6 two-dimensional projected images of the scene to be displayed are projected to the area where the pupil 50 of the observer is located. When the pupil 50 of the observer can receive the optical information of at least two two-dimensional projected images, at least two beams enter the pupil 50 of the observer through a display object point, thereby realizing a three-dimensional without focus-convergence conflict based on the monocular multi-image show. In the above process, the grouping manner of the orthogonal characteristic pixel groups of the display device 20 can also be grouping of pixels separated by (L-1) pixels in two directions, as shown in FIG. 10. In this process, the pupil 50 of the observer may not be able to receive all the light beams corresponding to the two complete two-dimensional projected images, for example, when the convergent image of the sub-line light source deviates from the orthogonal characteristic far away. In fact, different parts of different two-dimensional projected images can be spliced together to form a spliced two-dimensional projected image. The number of pixels contained in this type of split two-dimensional projected image is equal to the number of pixels of the two-dimensional projected image, and its pixel distribution range is consistent with the pixel distribution range of the two-dimensional projected image. To realize single-eye multi-image display, it is required to project at least two images of the scene to be displayed to the pupil 50 of the observer within one cycle. The two images may be two-dimensional projected images or split two-dimensional projected images. In other words, it is required that the number of light beams projected to the pupil 50 of the observer with the corresponding light information loaded in each pixel of the display device 20 in each cycle period is at least equal to that of the pixels contained in the two orthogonal characteristic pixel groups. Number.

When each line light source of each sequential line light source array 110 is composed of L≧2 orthogonal characteristic sub-line light sources, the spatial position of the observer’s pupil 50 determined in real time by the tracking device 80 can also be obtained from the time sequence line light source array 110 Among the M line light sources, the control device 60 selects K line light sources that meet the requirements of monocular multi-image in real time as effective line light sources, 2≦K<M, and controls the K effective line light sources to be composed at adjacent K time points The time sequence switch in each valid cycle period of, the same is displayed. In another case, at one point in time, only L sub-line light sources with orthogonal characteristics of one line light source can meet the requirements of monocular multi-view display. In this case, at each point in time, according to the spatial position of the observer’s pupil 50 determined by the tracking device 80, the control device 60 determines in real time the line light source that meets the requirements for monocular multi-image display as the effective line light source, and the control device 60 controls The L orthogonal characteristic sub-line light sources of the effective orthogonal characteristic light source are projected and turned on, and each pixel of the display device 20 is refreshed synchronously with corresponding light information.

Example 2

A display module with multiple backlight sources of this patent is composed of a sequential point light source array 120, a display device 20, a convergence device 30, a light path guiding device 40, a control device 60 and other components. The sequential point light source array 120 includes more than one Point light sources, each point light source is composed of more than one orthogonal characteristic sub-point light sources that respectively emit different orthogonal characteristic lights. Each point light source is switched on and off sequentially in each cycle composed of adjacent time points, and at a time Point only one point light source's orthogonal characteristic sub-point light source is turned on. The light emitted by each orthogonal characteristic sub-point light source is condensed to the convergence image of the orthogonal characteristic sub-point light source through the converging device 30 or the converging device 30 and other components. The display device 20 is placed on the light transmission path of the point light source array 120, and is composed of pixel groups that allow light of different orthogonal characteristics to enter, and loads the two-dimensional projected image information of the scene to be displayed. Under the guidance of the light path guide device 40, the time sequence The projection load light information to the area where the pupil 50 of the observer near the convergence image of the orthogonal characteristic sub-point light source is located. The display device 20 is designed to project at least one image information of the scene to be displayed into the pupil of the observer in each cycle, and realize a three-dimensional display that overcomes the focus-convergence conflict based on Maxwell projection or/and monocular multi-image.

FIG. 11 shows the basic structure of a display module using point light sources, including a sequential point light source array 120, a display device 20, a converging device 30, a light path guiding device 40, and a control device 60. Among them, the sequential point light source array 120 includes M≧2 point light sources, and each point light source is composed of L≧2 orthogonal characteristic sub-point light sources. Each point light source has L orthogonal characteristic sub-point light sources and L orthogonal characteristic. There is a one-to-one correspondence, and only the light with the corresponding orthogonal characteristic is emitted. The light emitted by the M×L orthogonal characteristic sub-point light sources of the M point light sources is condensed toward the corresponding converging image by the condensing device 30. Figure 11 takes M=3 and L=2 as an example. M×L=6 orthogonal characteristic sub-point light sources PS ₁₁ , PS ₁₂ , PS ₂₁ , PS ₂₂ , PS ₃₁ , PS ₃₂ are arranged along the y direction, and the light emitted by the converging device 30 is respectively converged to the corresponding convergent image I _PS11 , I _PS12 , I _PS21 , I _PS22 , I _PS31 , I _PS32 . The display device 20 uses the light emitted by each orthogonal characteristic sub-point light source as a backlight, and is placed on the transmission path of the projected light to modulate, load and project light information. The light path guiding device 40 may be a single device or may include multiple components, which are placed on the propagation path of the light projected by each orthogonal characteristic sub-point light source, and guide the light projected by the display device 20 to transmit to the area where the pupil 50 of the observer is located. The display device 20 also has orthogonal characteristics: along at least one direction, pixels with an interval of (L-1) pixels are grouped respectively, and the pixels of the display device 20 are formed into a total of L orthogonal characteristic pixel groups, and the L The pixel group and the L orthogonal characteristic sub-point light sources of each point light source are in one-to-one correspondence respectively. The pixels of each orthogonal characteristic pixel group only allow the projection light of the corresponding orthogonal characteristic sub-point light source to be incident modulation, and cut off the projection light of other non-corresponding orthogonal characteristic sub-point light sources. The L sub-point light sources with orthogonal characteristics of the same point light source are turned on or off synchronously at one point in time. In this way, at each point in time, the L orthogonal characteristic pixel groups of the display device 20 are equivalent to L display screens, and the corresponding L orthogonal characteristic sub-point light sources that are turned on synchronously can independently project the scenes to be displayed. L two-dimensional projected images. In Figure 11, L=2 orthogonal characteristics are taken as mutually perpendicular linear polarization states "·" and "-". Specifically, the point light source PS ₁ includes L=2 orthogonal characteristic sub-point light sources PS ₁₁ and PS ₁₂ ; the point light source PS ₂ includes L=2 orthogonal characteristic sub-point light sources PS ₂₁ and PS ₂₂ ; the point light source PS ₃ includes L=2 orthogonal characteristic sub-point light sources PS ₃₁ and PS ₃₂ . Among them, the orthogonal characteristic sub-point light sources PS ₁₁ , PS ₂₁ , and PS ₃₁ emit “-” orthogonal characteristic light, and the orthogonal characteristic sub-point light sources PS ₁₂ , PS ₂₂ , and PS ₃₂ emit “-” orthogonal characteristic light. Along the y direction, the pixels of the display device 20 with an interval of L-1=1 pixels are grouped, that is, the pixels marked with "·" and "-" in the figure are grouped into groups, forming L=2 orthogonal characteristic pixel groups , Respectively named the "·" state orthogonal characteristic pixel group and the "-" state orthogonal characteristic pixel group, which correspond to allowing only the "·" state light and the "-" state light to enter and modulate them respectively. Then at a point in time, L=2 orthogonal characteristic sub-point light sources of only one point light source are turned on. For example, when only the orthogonal characteristic sub-point light sources PS ₁₁ and PS _{12 are} turned on, the "·" state orthogonal characteristic pixel group is turned on. The projection light of the intersection characteristic sub-point light source A ₁₂ is the backlight for light information loading and projection, and the "-" state orthogonal characteristic pixel group uses the _{projection light of the orthogonal characteristic sub-point light source A 11} as the backlight for light information loading and projection. The light information loaded by each pixel at each time point is the sagittal direction of the light beam projected by the pixel at that time point and incident on the area where the observer’s pupil 50 is located, and the scene to be displayed is at the sagittal direction and where the observer’s pupil 50 is located. The projection information on the intersection of the faces. In the module shown in FIG. 11, the optical path guiding device 40 includes M×L=6 reflective surfaces 401a, 401b, 401c, 401d, 401e, and 401f, respectively, with orthogonal characteristic sub-point light source convergence images I _PS11 , I _PS21 , I _PS31 , I _PS12 , I _PS22 , I _PS32 . In each cycle composed of adjacent M=3 time points, each point light source is controlled by the control device 60, and time sequence is switched on, and at a time point, only one point light source is turned on. Specifically, at the time point t, only the point light source PS _{1 is} turned on, _{and both PS 2} and PS ₃ are turned off, and the light emitted by the orthogonal characteristic sub-point light sources PS _{11 and PS 12} are respectively modulated by the two orthogonal characteristic pixel groups of the display device 20 , The corresponding light information is projected to the convergent images I _PS11 and I _{PS12 of the orthogonal characteristic sub-point light sources PS 11} and PS ₁₂ through the converging device 30, and then reflected by the reflective surfaces 401a and 410d, respectively, to the pupil 50 of the observer. Area propagation; at the time point t+Δt/3, only the point light source PS _{2 is} turned on, _{and both PS 1} and PS ₃ are turned off. The orthogonal characteristic sub-point light sources PS ₂₁ and PS ₂₂ emit light through the two orthogonal characteristics of the display device 20 The pixel groups are respectively modulated, carrying their corresponding light information and projected to the convergent images I _PS21 and I _{PS22 of the orthogonal characteristic sub-point light sources PS 21} and PS ₂₂ through the converging device 30, and then are respectively reflected by the reflective surfaces 401b and 410e to the observer The area where the pupil 50 is located spreads; and so on. Then, in one cycle, the projection of M×L=6 two-dimensional projected images of the scene to be displayed is realized to the area where the pupil 50 of the observer is located. When the distance between the convergent images of adjacent point light sources is less than a certain value, the pupil 50 of the observer can receive at least two two-dimensional projected images from the display device 20, and then at least two light beams enter the pupil 50 of the observer through a display object point. A three-dimensional display without focus-convergence conflict is realized based on single-lens multiple images. When the observer pupil 50 can receive a two-dimensional projected image from the display device 20 by itself, a beam of light enters the observer pupil 50 through a display object point, so that a three-dimensional display without focus-convergence conflict is realized based on Maxwell projection .

In the above process, the pupil 50 of the observer may not be able to receive all the light beams corresponding to exactly one or at least two complete two-dimensional projected images, for example, when the convergent image deviates from the point light source far away. In fact, different parts of different two-dimensional projected images can be spliced together to form a spliced two-dimensional projected image. The number of pixels contained in this type of split two-dimensional projected image is equal to the number of pixels of the two-dimensional projected image, and its pixel distribution range is consistent with the pixel distribution range of the two-dimensional projected image. To perform monocular multi-image display, it is required to project at least two images of the scene to be displayed into the pupil 50 of the observer in one cycle. The two images can be two-dimensional projected images, or can be split two-dimensional projected images. In other words, monocular multi-image display requires that the number of light beams incident on the observer's pupil 50 be at least equal to the number of pixels in the two orthogonal characteristic pixel groups in each cycle period. To perform Maxwell projection display, it is required to project an image of the scene to be displayed into the pupil 50 of the observer within a cycle period. The one image may be a two-dimensional projected image, or a split-type two-dimensional projected image. In other words, Maxwell projection requires that in each cycle period, the number of beams incident on the observer's pupil 50 is equal to the number of pixels in an orthogonal characteristic pixel group. When the number of light beams received by the pupil 50 of the observer is between the number of pixels in one orthogonal characteristic pixel group and the number of pixels in two orthogonal characteristic pixel groups, monocular multi-image and Maxwell projection can work together. Ensure the free focus of a single purpose.

When the converging device 30 is placed in front of the display device 20 along the light beam transmission direction, the modulation function of the converging device 30 also appears as an enlarged virtual image of the display device 20. In addition, along the light beam transmission direction, the display device 20 can also be placed in front of the converging device 30, as shown in FIG. 12. In a display module with multiple backlight sources of this patent, a front converging device 70 can also be introduced between the sequential point light source array 120 and the display device 20 to modulate each orthogonal characteristic sub-point light source when the backlight is incident on the display device 20. Divergence. In FIG. 13, the front converging device 70 takes a lens as an example, and each orthogonal characteristic sub-point light source is placed on the front focal plane of the front converging device 70. Each orthogonal characteristic sub-light source projects parallel light beams into the display device 20 through the front converging device 70. In fact, the positions of the orthogonal characteristic sub-point light sources and the front converging device 70 can also be such that the orthogonal characteristic sub-point light sources project divergent or convergent light into the display device 20 through the front converging device 70. Further, the sub-point light sources with orthogonal characteristics can also be placed in a staggered position along the transmission direction of the projected light, as shown in FIG. 14.

The light path guiding device 40 is used to adjust the light beam transmission path of the display module described in this patent to make it suitable for various application environments. For example, in the above figures, the reflective surface on which each orthogonal characteristic sub-point light source converges as a component of the light path guiding device 40 can receive external ambient light information through the gap between the reflective surfaces. In addition, setting the size and position of each reflecting surface can also play a low-pass or band-pass filter function. If there is no need for external ambient light, the multiple reflective surfaces at the convergence image of the sub-point light sources with the orthogonal characteristics of the above figures can be removed or replaced with a whole reflective surface, and the integral reflective surface can deviate from the convergence image of each point light source place. At this time, the pupil 50 of the observer can be designed to be placed at the convergent image of the orthogonal characteristic sub-point light source, or even closer to the convergent device 30. Further, the optical path guiding device 40 can be designed in a variety of other different structures, such as the examples shown in FIG. 15, FIG. 16, and FIG. 17. Figure 15, Figure 16, and Figure 17 take M×L=2×2 for examples. In FIG. 15, adding the component reflection surface 402 to the light path guiding device 40 is more conducive to the compactness of the display module structure. FIG. 16 shows an optical path structure using a reflective display device 20. As shown in FIG. The optical path guiding device 40 is composed of a semi-transparent and semi-reversed surface 406 and reflective surfaces 401a, 401b, 401c, and 401d placed at the convergent image of each orthogonal characteristic sub-point light source. The emitted light from each orthogonal characteristic sub-point light source enters the reflective display device 20 through the front convergent device 70 and the semi-transparent and semi-transparent surface 406 for information loading. The light projected by the reflective display device 20 carries light information into the transflective surface 406 again and is reflected, and then is guided by the reflective surfaces 401a, 401b, 401c, and 401d to the area where the pupil 50 of the observer is located. FIG. 17 uses a free-form surface optical component as the guiding device 40, and the converging device 30 is compounded. Among them, the free-form surfaces F3, F2, and F4 are used as components of the guiding device 40, and the free-form surfaces F1, F2, F3, and F4 function as the converging device 30. In addition, the free-form surface F5 eliminates the influence of the free-form surfaces F2 and F4 on the incident light of the external environment, and allows the external environment light and the display scene to enter the pupil 50 of the observer together.

In the above figures of this embodiment, the one-dimensional arrangement of the sub-point light sources with orthogonal characteristics is taken as an example, which can also be extended to the two-dimensional arrangement. In the above process of this embodiment, the grouping manner of the orthogonal characteristic pixel groups of the display device 20 can also be grouping of pixels separated by (L-1) pixels in two directions, as shown in FIG. 10.

In a display module with multiple backlight light sources using orthogonal characteristic sub-point light sources in this embodiment, a larger M value is beneficial to obtaining a larger viewing area. However, at the same time, higher requirements are also put on the frame rate of the display device 20. According to the real-time determination of the spatial position of the observer’s pupil 50 by the tracking device 80, from the M orthogonal characteristic sub-point light sources of the sequential point light source array 120, the control device 60 selects the K necessary to realize Maxwell projection or monocular multi-image in real time. As an effective point light source, 2≦K<M, and control the K effective orthogonal characteristic sub-point light sources to switch in sequence in each effective cycle composed of adjacent K time points. The display can also be reduced by the same reason. Display device 20 frame rate requirements. There is also a situation that at one point in time, only L orthogonal characteristic sub-point light sources of one point light source can meet the requirements of monocular multi-view or Maxwell projection display. In this case, at each time point, according to the spatial position of the observer’s pupil 50 determined by the tracking device 80, the control device 60 determines in real time a point light source that meets the requirements of monocular multi-image or Maxwell projection display as an effective point light source, and the control device 60 controls the L orthogonal characteristic sub-point light sources of the effective point light source to turn on, and refreshes each pixel of the display device 20 with corresponding light information in synchronization.

When the value of M is large, the light projected by the display device 20 can cover the eyes of the observer, and each eye can receive one or at least two images of the scene to be displayed required for Maxwell projection display or monocular multi-view display, A display module with multiple backlight sources of this patent can independently be used as the optical engine of a three-dimensional display system. In addition, a display module with multiple backlight sources of this patent can be used as an eyepiece, and only project one or at least two images required for Maxwell projection display or monocular multi-view display to one eye of the observer, using two such The module builds the optical engine of the binocular display system, such as AR/VR.

In this patent, each light source, including the line light source described in this patent, or the orthogonal characteristic sub-line light source, or the orthogonal characteristic sub-point light source, and its corresponding convergent image, is not required to be an object image in a strict sense. relation. The meaning is that after the light projected by a light source is modulated by the display device 20, the light emitted by each pixel is projected to an area in a convergent form, and the area can be used as a corresponding convergent image of the light source.

The core idea of the present invention is to use the light source of the time sequence switch as the backlight source, based on the time sequence multiplexing, project one or at least two images of the scene to be displayed to the pupil 50 of the observer. Focus-convergence conflict three-dimensional display display modules, in which the linear light source design relieves the display module’s excessively high requirements for the number of light sources, and the orthogonal characteristic design increases the number of two-dimensional projected images that the display module can project.

The above are only preferred embodiments of the present invention, but the design concept of the present invention is not limited to this, and any insubstantial modifications made to the present invention using this concept also fall within the protection scope of the present invention. Accordingly, all related embodiments fall within the protection scope of the present invention.

Claims (12)

1. A display module with multiple backlight light sources, characterized in that it comprises:

   The sequential line light source array (110) includes M line light sources arranged in a one-dimensional direction, which are turned on sequentially in each cycle composed of M adjacent time points, and only one line light source is turned on at a time point, where M≧ 2;

   A display device (20), comprising a plurality of pixels, is located at a position corresponding to the time-series line light source array (110) and uses projection light from the time-series line light source array (110) as a backlight, and loads and projects light information;

   A converging device (30) for modulating the display device (20) to load light information and guiding the projection beams of each pixel to converge and transmit;

   The light path guiding device (40) is placed on the transmission path of the light emitted from the sequential line light source array (110), and guides the light from the sequential line light source array (110) to enter the display device (20) or/and guide the light from the The light information of the display device (20) enters the area where the pupil (50) of the observer is located;

   The control device (60) is respectively connected to the sequential line light source array (110) and the display device (20), and is used to control the M line light sources of the sequential line light source array (110) to operate at M adjacent times. For each cycle composed of dots, only one at a time point is sequentially turned on, and corresponding light information is synchronously loaded to each pixel of the display device (20);

   The display module with multiple backlight sources is set so that the light information loaded by each pixel of the display device (20) is along the sagittal direction of the light beam from the pixel that enters the area where the observer’s pupil (50) is located. Display the projection information of the scene on the intersection of the sagittal direction and the plane where the pupil (50) of the observer is located.
2. The display module with multiple backlight sources according to claim 1, characterized in that each pixel of the display device (20) projects at least two light beams to the pupil (50) of the observer in each cycle and time sequence.
3. A display module with multiple backlight light sources according to any one of claims 1 and 2, characterized in that it further comprises a front convergent device (70) placed on the sequential line light source array (110) and the display device (20), adjust the divergence of the incident light of the display device (20).
4. The display module with multiple backlight sources according to any one of claims 1 and 2, further comprising a tracking device (80) connected to the control device (60) for real-time tracking and determining the pupils of the observer (50) The spatial location.
5. The display module with multiple backlight light sources according to claim 4, characterized in that the control device (60) is configured to be able to select M of the sequential line light source array (110) in real time according to the spatial position of the pupil (50). K of the line light sources are used as effective line light sources, and the control device (60) can control the K effective line light sources to switch on and off in each effective cycle composed of adjacent K time points, and refresh the display with corresponding light information in synchronization Each pixel of the device (20), where M﹥K≧2.
6. The display module with multiple backlight light sources according to claim 1, characterized in that, each line light source of the sequential line light source array (110) is composed of L sub-line light sources with orthogonal characteristics, and each line light source is turned on. Among the pixels of the display device (20), pixels separated by (L-1) pixels along at least one direction are respectively grouped, and the pixels of the display device (20) form L orthogonal characteristic pixel groups, where L≧2 ；

   Wherein, the L orthogonal characteristic sub-line light sources of each line light source correspond to the L orthogonal characteristics one-to-one, and each orthogonal characteristic sub-line light source only emits light corresponding to the orthogonal characteristic; the L orthogonal characteristic pixel groups and The L orthogonal characteristic sub-line light sources of each line light source are in one-to-one correspondence, and the pixels of each orthogonal characteristic pixel group only allow the projection light of the corresponding orthogonal characteristic sub-line light source to enter, be modulated and emitted, and the non-corresponding orthogonal characteristic sub-line light source is cut off. Line light source projecting light;

   The display module with multiple backlight sources is characterized in that the number of light beams incident on the pupil (50) of the observer in each cycle is at least equal to the number of pixels included in two orthogonal characteristic pixel groups.
7. The display module with multiple backlight sources according to claim 6, further comprising a tracking device (80) connected to the control device (60) for real-time tracking and determining the space of the pupil (50) of the observer Location;

   The control device (60) is set to be able to select K line light sources whose projected light enters the observer’s pupil (50) as effective line light sources in real time according to the spatial position of the observer’s pupil (50). The control device (60) can control the The K effective line light sources are switched on and off sequentially in each effective cycle formed by adjacent K time points, and the pixels of the display device (20) are refreshed in synchronization with corresponding optical information, where M﹥K≧2.
8. The display module with multiple backlight sources according to claim 6, further comprising a tracking device (80) connected to the control device (60) to track and determine the spatial position of the observer's pupil (50) in real time;

   The control device (60) is set to be able to select a line light source whose projection light enters the observer's pupil (50) as an effective line light source in real time according to the spatial position of the observer's pupil (50) at each time point. The control device ( 60) The L orthogonal characteristic sub-line light sources capable of controlling the effective line light source to be turned on at this point in time, and synchronously refresh each pixel of the display device (20) with corresponding light information.
9. A display module with multiple backlight light sources, characterized in that it comprises:

   The sequential point light source array (120) includes M point light sources, which are turned on sequentially in each cycle composed of M adjacent time points, and only one point light source is turned on at a time point, where M≧2;

   Among them, each point light source is composed of L orthogonal characteristic sub-point light sources, and each point light source is turned on. The L orthogonal characteristic sub-point light sources correspond to L orthogonal characteristics one-to-one, and each orthogonal characteristic sub-point light source only projects Corresponding to light with orthogonal characteristics, where L≧2;

   The display device (20) includes a plurality of pixels, is located at a position corresponding to the sequential line light source array (110) and uses the projection light from the sequential point light source array (120) as a backlight, loads and projects light information, and Pixels separated by (L-1) pixels along at least one direction are respectively grouped to form L orthogonal characteristic pixel groups;

   Among them, the L orthogonal characteristic pixel groups of the display device (20) correspond to the L orthogonal characteristic sub-point light sources of each point light source respectively, and the pixels of each pixel group only allow the light projected by the corresponding orthogonal characteristic sub-point light sources. Incident, modulated and emitted, and cut off the light projected by other non-corresponding orthogonal characteristic sub-point light sources;

   A converging device (30), which modulates the display device (20) to load light information, and guides the projection beams of each pixel to converge and transmit;

   The light path guide device (40) is placed on the transmission path of the light emitting path of the time sequence point light source array (120), and guides the light from the time sequence point light source array (120) to enter the display device (20) or/and guide the light from the time sequence point light source array (120). The area where the light of the display device (20) is incident on the pupil (50) of the observer;

   The control device (60) is respectively connected with the time sequence point light source array (120) and the display device (20), and is used to control the M point light sources of the time sequence point light source array (120) to operate at M adjacent times. For each cycle composed of dots, only one at a time point is sequentially turned on, and corresponding light information is synchronously loaded to each pixel of the display device (20);

   The display module with multiple backlight sources is set so that the light information loaded by each pixel of the display device (20) is along the sagittal direction of the light beam from the pixel that enters the area where the observer’s pupil (50) is located. Displays the projection information of the scene at the intersection of the sagittal direction and the observer’s pupil (50), and in each cycle, the number of beams incident on the observer’s pupil (50) is at least equal to that of the pixels contained in an orthogonal characteristic pixel group number.
10. The display module with multiple backlight sources according to claim 9, characterized in that it further comprises a front converging device (70), which is placed between the sequential point light source array (120) and the display device (20), To adjust the divergence of incident light of the display device (20).
11. The display module with multiple backlight sources according to claim 9, further comprising a tracking device (80) connected to the control device (60) for real-time tracking and determining the space of the pupil (50) of the observer Location;

    The control device (60) is set to be able to select K point light sources whose projected light enters the observer’s pupil (50) as effective point light sources in real time according to the spatial position of the observer’s pupil (50). The control device (60) can The K effective point light sources are controlled to switch sequentially in each effective cycle formed by adjacent K time points, and the pixels of the display device (20) are refreshed synchronously with corresponding light information, where M﹥K≧2.
12. The display module with multiple backlight sources according to claim 9, further comprising a tracking device (80) connected to the control device (60) for real-time tracking and determining the space of the pupil (50) of the observer Location;

    The control device (60) is set to be able to select a point light source whose projection light enters the observer's pupil (50) as an effective point light source in real time according to the spatial position of the observer's pupil (50) at each time point, and control the effective point The L sub-point light sources with orthogonal characteristics of the light source are turned on at this time point, and the pixels of the display device (20) are refreshed synchronously with corresponding light information.

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