Three-dimensional projection system and control method

Abstract

The invention provides a three-dimensional projection system and a control method. The system comprises a light source module, a first lens, an image source selection liquid crystal light valve, an image display module and a projection module, the first lens is arranged on the light emitting side of the light source module; the image source selection liquid crystal light valve comprises at least two light-transmitting units, and each light-transmitting unit can be switched between a first light-transmitting state and a second light-transmitting state; in the first light-transmitting state, the light-transmitting unit is used for transmitting polarized light of the light-emitting beam in the preset direction. In the second light-transmitting state, the light-transmitting unit is used for shielding the light-emitting beams; the image display module is arranged on the light emitting side of the image source selection liquid crystal light valve and comprises at least two image display units, and each light transmitting unit corresponds to one image display unit. According to the scheme provided by the invention, a relatively high refresh rate of the screen can be kept on the basis of utilizing a common display screen, and the method has the characteristics of good effect and low cost.

Description

Technical Field

[0001] This application relates to the field of projection technology, and in particular to a three-dimensional projection system and control method. Background Technology

[0002] 3D projectors based on Digital Light Processing (DLP) display utilize Texas Instruments' DLP Link technology (3D imaging technology). DLP Link is simply a technology that adds a pulse synchronization signal between the images corresponding to the left and right eyes. At a 120Hz refresh rate, after displaying an image corresponding to either the first or second eye every 1 / 120th of a second, the DLP chip emits a white peak pulse. The photosensitive element at the front of the 3D glasses senses this pulse and alternately opens and closes the liquid crystal light valves of the left and right lenses to achieve synchronization. However, DLP Link relies entirely on a DLP chip, which is expensive. Maintaining a high refresh rate increases the cost and complicates the structure of the 3D projector.

[0003] One implementation of 3D projector design based on a single LCD in related technologies requires a 120Hz high refresh rate screen, while another implementation only requires a regular liquid crystal display (LCD) with a 60Hz refresh rate. However, the latter requires the distance between the image source selection liquid crystal light valve and the pixels of the LCD to be very close, and the strip electrode of the image source selection liquid crystal light valve to be aligned with the pixel row of the LCD, resulting in a complex structure and high manufacturing process requirements. Summary of the Invention

[0004] The purpose of this application is to provide a three-dimensional projection system and control method to solve the problem that achieving high refresh rates in three-dimensional projectors leads to complex structures or high costs in related technologies.

[0005] To achieve the above objectives, embodiments of this application provide a three-dimensional projection system, comprising:

[0006] A light source module, wherein the light source module is used to provide a light beam;

[0007] A first lens and an image source selection liquid crystal light valve. The first lens is disposed on the light-emitting side of the light source module. The light beam provided by the light source module is transmitted to the image source selection liquid crystal light valve after being straightened by the first lens.

[0008] The image source selection liquid crystal light valve includes at least two light-transmitting units, wherein each light-transmitting unit is capable of switching between a first light-transmitting state and a second light-transmitting state; in the first light-transmitting state, the light-transmitting unit is used to transmit preset direction polarized light of the light-emitting beam; in the second light-transmitting state, the light-transmitting unit is used to block the light-emitting beam.

[0009] The system further includes: an image display module and a projection module; the image display module is disposed on the light-emitting side of the image source selection liquid crystal light valve, and includes at least two image display units, wherein each of the light-transmitting units corresponds to one of the image display units;

[0010] The projection module is disposed on the light-emitting side of the image display module and includes at least two projection units. Each projection unit corresponds to one of the image display units, and each projection unit is used to project the preset direction polarized light that passes through the corresponding image display unit.

[0011] Optionally, the image source selection liquid crystal light valve includes:

[0012] A first glass substrate and a second glass substrate disposed opposite to each other;

[0013] At least two liquid crystal control units are located between the first glass substrate and the second glass substrate, and each liquid crystal control unit corresponds to one of the light-transmitting units;

[0014] A reflective polarizer is used to transmit the P-light in the emitted light beam provided by the light source module and to emit the S-light in the emitted light beam back to the light source module.

[0015] The reflective polarizer is disposed on the side of the second glass substrate opposite to the first glass substrate, and the distance between the second glass substrate and the light source module is less than the distance between the first glass substrate and the light source module.

[0016] Optionally, the liquid crystal control unit includes a first electrode layer, a second electrode layer, and a liquid crystal layer disposed opposite to each other;

[0017] The first electrode layers of different liquid crystal control units are interconnected and constitute the same electrode layer; the second electrode layers of different liquid crystal control units are located on the same layer and there is a preset interval between adjacent second electrode layers, or the second electrode layers of different liquid crystal control units are located on different layers and the overlapping structure between the connected second electrode layers is made of insulating material.

[0018] Optionally, the image display module includes:

[0019] A first image display unit and a second image display unit, wherein the light-incident side of the first image display unit is disposed opposite to the area of ​​the first light-transmitting unit of the image source selection liquid crystal light valve, and the light-incident side of the second image display unit is disposed opposite to the area of ​​the second light-transmitting unit of the image source selection liquid crystal light valve; the first light-transmitting unit and the second light-transmitting unit have the same area as the corresponding image display unit.

[0020] Optionally, the first image display unit and the second image display unit are each an independent image display screen; or,

[0021] The first image display unit and the second image display unit share a common image display screen.

[0022] Optionally, the projection module includes:

[0023] A first projection unit and a second projection unit, wherein the first projection unit projects light polarized in a preset direction corresponding to the first image display unit, and the second projection unit projects light polarized in a preset direction corresponding to the second image display unit.

[0024] Optionally, the system further includes:

[0025] The second lens and the third lens are located on the light-emitting side of the image display module;

[0026] The light polarized in the preset direction by the image display module is straightened by the second lens and the third lens and then transmitted to the corresponding projection module.

[0027] Optionally, the system further includes:

[0028] The liquid crystal shutter glasses include a left-eye light valve lens and a right-eye light valve lens; the left-eye light valve lens is used to display a first image formed by the first projection unit; the right-eye light valve lens is used to display a second image formed by the second projection unit.

[0029] To achieve the above objectives, embodiments of this application also provide a control method for a three-dimensional projection system, applied to the three-dimensional projection system described above, comprising:

[0030] At a first moment, a first voltage signal is output to the first light-transmitting unit in the image source selection liquid crystal light valve, and a second voltage signal is output to the second light-transmitting unit in the image source selection liquid crystal light valve; the first voltage signal is used to put the first light-transmitting unit into a first light-transmitting state; the second voltage signal is used to put the second light-transmitting unit into a second light-transmitting state; at the first moment, the image output control of the image display module is controlled, and the left eye image is displayed in the first image display unit corresponding to the image display module;

[0031] At the second moment, the second voltage signal is output to the first light-transmitting unit, and the first voltage signal is output to the second light-transmitting unit; at the second moment, the image output control of the image display module is controlled, and the right eye image is displayed in the second image display unit corresponding to the image display module.

[0032] Optionally, the system further includes: liquid crystal shutter glasses; in the case that the system includes a left-eye light valve lens and a right-eye light valve lens, the method further includes:

[0033] The voltage switching frequency of the image source selection liquid crystal light valve is controlled to be synchronized with the lens voltage switching frequency of the liquid crystal shutter glasses.

[0034] The beneficial effects of the above technical solution in this application are as follows:

[0035] In this embodiment, the system includes: a light source module, a first lens, an image source selection liquid crystal light valve, an image display module, and a projection module; the first lens is disposed on the light-emitting side of the light source module; the image source selection liquid crystal light valve includes at least two light-transmitting units, wherein each light-transmitting unit can switch between a first light-transmitting state and a second light-transmitting state; in the first light-transmitting state, the light-transmitting unit is used to transmit light polarized in a preset direction of the emitted light beam; in the second light-transmitting state, the light-transmitting unit is used to block the emitted light beam; the image display module is disposed on the light-emitting side of the image source selection liquid crystal light valve and includes at least two image display units, wherein each light-transmitting unit corresponds to one image display unit. The solution of this application can maintain a high screen refresh rate while utilizing a conventional display screen, and has the characteristics of good performance and low cost. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the three-dimensional projection system provided in the embodiments of this application;

[0037] Figure 2 This is one of the structural schematic diagrams of the image source selection liquid crystal light valve provided in the embodiments of this application;

[0038] Figure 3 A second schematic diagram of the image source selection liquid crystal light valve provided in the embodiments of this application;

[0039] Figure 4 A flowchart illustrating the control method of the three-dimensional projection system provided in this application embodiment. Detailed Implementation

[0040] To make the technical problems, technical solutions and advantages of this application clearer, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0041] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0042] In the embodiments of this application, the term "multiple" refers to two or more, and other quantifiers are similar.

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0044] Reference Figure 1 As shown, this application provides a three-dimensional projection system, including:

[0045] The light source module 200 is used to provide a light beam; the light source module 200 of this application can be a light-emitting diode (LED) backlight bead, a halogen lamp, etc.

[0046] A first lens 201 and an image source selection liquid crystal light valve 202 are used. The first lens 201 is disposed on the light-emitting side of the light source module 200. The light beam provided by the light source module 200 is transmitted to the image source selection liquid crystal light valve 202 after being straightened by the first lens 201. The first lens 201 may be a Fresnel lens.

[0047] The image source selection liquid crystal light valve 202 includes at least two light-transmitting units, wherein each light-transmitting unit is capable of switching between a first light-transmitting state and a second light-transmitting state; in the first light-transmitting state, the light-transmitting unit is used to transmit preset direction polarized light of the light-emitting beam; in the second light-transmitting state, the light-transmitting unit is used to block the light-emitting beam.

[0048] The system further includes: an image display module and a projection module; the image display module is disposed on the light-emitting side of the image source selection liquid crystal light valve, and includes at least two image display units, wherein each of the light-transmitting units corresponds to one of the image display units;

[0049] The projection module is disposed on the light-emitting side of the image display module and includes at least two projection units. Each projection unit corresponds to one of the image display units, and each projection unit is used to project the preset direction polarized light that passes through the corresponding image display unit.

[0050] In this embodiment, the light emitted from the light source module 200, i.e., the provided light beam, is transmitted to the image source selection liquid crystal light valve 202 after being straightened by the first lens 201. The light is then guided to the image display module by 202. The image source selection liquid crystal light valve 202 can selectively allow some light to pass through and block other light. For example, different voltage values ​​can be input to the image source selection liquid crystal light valve 202 at different times, allowing each light-transmitting unit to switch between a first light-transmitting state and a second light-transmitting state. At the corresponding time, the image display module displays images using the image display units corresponding to different light-transmitting units, and then displays the corresponding images through the projection modules corresponding to the image display units, thereby forming corresponding images with parallax.

[0051] In this application, one light-transmitting unit corresponds to one image display unit, and one image display unit corresponds to one projection unit. It can be seen that the three are corresponding. For example, this application provides a screen 100, on which the left eye image 102 is presented at the first moment, and the right eye image 101 is presented at the second moment. Through different moments, it is used to cooperate with the image source selection liquid crystal light valve 202 to ensure that the left and right eyes see the corresponding images with parallax respectively, thereby forming stereoscopic vision in the brain.

[0052] Optionally, the three-dimensional projection system of this application also includes a light valve control module 400, which is used to input different voltages to the image source selection liquid crystal light valve 202 to control the voltage switching of the image source selection liquid crystal light valve 202.

[0053] Continue to refer to Figure 1 As shown, the image display module includes:

[0054] A first image display unit 203 and a second image display unit 204 are provided. The light-incident side of the first image display unit 203 is disposed opposite to the area of ​​the first light-transmitting unit of the image source selection liquid crystal light valve 202, and the light-incident side of the second image display unit 204 is disposed opposite to the area of ​​the second light-transmitting unit of the image source selection liquid crystal light valve 202. The first light-transmitting unit and the second light-transmitting unit have the same area as the corresponding image display unit.

[0055] In this embodiment, if the image source selection liquid crystal light valve 202 has two light-transmitting units, namely a first light-transmitting unit and a second light-transmitting unit, then the corresponding image display module has two image display units, namely a first image display unit 203 and a second image display unit 204. The area of ​​the first light-transmitting unit is the same as the area of ​​the corresponding first image display unit 203, and the area of ​​the second light-transmitting unit is the same as the area of ​​the corresponding second image display unit 204. That is, the light source module 200 of this application can guide light into the first image display unit 203 and the second image display unit 204. The overall area of ​​the image source selection liquid crystal light valve 202 is equal to the sum of the areas of the first image display unit 203 and the second image display unit 204.

[0056] Optionally, the first image display unit 203 and the second image display unit 204 are each independent image display screens; or,

[0057] The first image display unit 203 and the second image display unit 204 share a common image display screen.

[0058] In this application, the first image display unit 203 and the second image display unit 204 are independent image display screens, which can maintain the resolution of the image emitted by the light source module 200 unchanged. For example, if the original image resolution is 1080P, the resolution will still be 1080P after passing through the first image display unit 203 and the second image display unit 204. In this application, a single image display screen can also be divided into two areas, with the two areas forming the first image display unit 203 and the second image display unit 204 respectively. This is done to save costs. The image display screen can be a liquid crystal display (LCD).

[0059] Furthermore, the projection module includes:

[0060] A first projection unit 207 and a second projection unit 208 are used. The first projection unit 207 projects light polarized in a preset direction corresponding to the first image display unit 203, and the second projection unit 208 projects light polarized in a preset direction corresponding to the second image display unit 204.

[0061] In this embodiment, the first projection unit 207 projects light polarized in a preset direction through the first image display unit 203 to form a left-eye image 102 on the screen 100, and the second projection unit 208 projects light polarized in a preset direction through the second image display unit 204 to form a right-eye image 101 on the screen 100.

[0062] Optionally, the system further includes:

[0063] The second lens 205 and the third lens 206 are located on the light-emitting side of the image display module;

[0064] The light polarized in the preset direction by the image display module is straightened by the second lens 205 and the third lens 206 and then transmitted to the corresponding projection module.

[0065] The second lens 205 and the third lens 206 of this application are used to calibrate the preset direction polarized light passing through the image display module and import the image into the corresponding projection module. The second lens 205 corresponds to the first image display unit 203 and the first projection unit 207, and the third lens 206 corresponds to the first image display unit 204 and the second projection unit 208. This correspondence achieves the projection effect of the projection module. Both the second lens 205 and the third lens 206 can be Fresnel lenses. Both the first projection unit 207 and the second projection unit 208 are projection lens structures.

[0066] Optionally, the system further includes:

[0067] The liquid crystal shutter glasses 500 include a left eye light valve lens 501 and a right eye light valve lens 502; the left eye light valve lens 501 is used to present a first image formed by the first projection unit 207; the right eye light valve lens 502 is used to present a second image formed by the second projection unit 208.

[0068] The liquid crystal shutter glasses 500 of this application can control the opening and closing of the left-eye light valve lens 501 and the right-eye light valve lens 502. The switching frequency of the image source selection liquid crystal light valve 202 is the same as the switching frequency of the liquid crystal shutter glasses 500. For example, when the first light-transmitting unit in the image source selection liquid crystal light valve 202 is in the first light-transmitting state and the second light-transmitting unit is in the second light-transmitting state, the right-eye light valve lens 502 of the liquid crystal shutter glasses 500 is opened synchronously, and the left-eye light valve lens 501 is closed. This ensures that only the right eye can see the right-eye view on the projection screen. When the voltage switching of the image source selection liquid crystal light valve 202 and the lens switch on the liquid crystal shutter glasses 500 (not shown in the figure, this structure is a function or structure inherent in the liquid crystal shutter glasses 500 itself) switch quickly and synchronously, the viewer can form a stereoscopic vision.

[0069] Reference Figure 2 and Figure 3 As shown, the image source selection liquid crystal light valve 202 includes:

[0070] A first glass substrate 301 and a second glass substrate 302 are disposed opposite to each other;

[0071] At least two liquid crystal control units are located between the first glass substrate 301 and the second glass substrate 302, and each liquid crystal control unit corresponds to one of the light-transmitting units;

[0072] The reflective polarizer 303 is used to transmit the P-light in the light-emitting beam provided by the light source module 200 and to emit the S-light in the light-emitting beam back to the light source module 200.

[0073] The reflective polarizer 303 is disposed on the side of the second glass substrate 302 opposite to the first glass substrate 301, and the distance between the second glass substrate 302 and the light source module 200 is less than the distance between the first glass substrate 301 and the light source module 200.

[0074] In this embodiment, at least two liquid crystal control units are located between the first glass substrate 301 and the second glass substrate 302, and are respectively connected to the first glass substrate 301 and the second glass substrate 302. A reflective polarizer 303 is disposed facing the light source module 200. The light emitted from the light source module 200 becomes polarized P-light after passing through the reflective polarizer 303, while the polarized S-light component is reflected back into the structure containing the light source module 200. After multiple reflections and refractions, it becomes a mixture of P-light and S-light. The reflective polarizer 303 and the light source module 200 provided in this application can increase the transmittance of P-light and reduce its impact on brightness.

[0075] Optionally, the liquid crystal control unit includes a first electrode layer 304, a second electrode layer, and a liquid crystal layer 305 located between the first electrode layer 304 and the second electrode layer, which are disposed opposite to each other.

[0076] The first electrode layers of different liquid crystal control units are interconnected and constitute the same electrode layer; the second electrode layers of different liquid crystal control units are located on the same layer and there is a preset interval between adjacent second electrode layers, or the second electrode layers of different liquid crystal control units are located on different layers and the overlapping structure between the connected second electrode layers is made of insulating material.

[0077] In this application, reference is made to Figure 2 or Figure 3 As shown, the first electrode layers 304 of different liquid crystal control units are interconnected and constitute the same electrode layer. The second electrode layers of different liquid crystal control units are located on the same layer, and the second electrode layers of different liquid crystal control units are respectively represented by the first target electrode layer 306 and the second target electrode layer 307, as shown in the figure. Figure 2 As shown, the first target electrode layer 306 and the second target electrode layer 307 can be located in the same layer, and there is a preset interval between adjacent first target electrode layers 306 and second target electrode layers 307; Refer to Figure 3 As shown, the first target electrode layer 306 and the second target electrode layer 307 are located in different layers and have an overlapping structure, which is encapsulated with an insulating material.

[0078] Specifically, refer to Figures 1 to 3 As shown, the three-dimensional projection system of this application includes: liquid crystal shutter glasses 500; a light source module 200; a first lens 201; an image source selection liquid crystal light valve 202; a first image display unit 203 and a second image display unit 204 of the image display module; a second lens 205 and a third lens 206; a first projection unit 207 and a second projection unit 208. The screen is for displaying the projection effect and is not a major component of this invention, but it is listed to illustrate the implementation of the solution.

[0079] The LCD shutter glasses 500 include lenses composed of two liquid crystal light valves, which work in conjunction with the image source selection liquid crystal light valve 202 to ensure that the left and right eyes see corresponding images with parallax, thereby forming stereoscopic vision in the brain. The light source module 200 provides illumination to the first image display unit 203 and the second image display unit 204 of the LCD image area. The first lens 201 collimates and adjusts the light emitted from the light source module 200, guiding the light to the first image display unit 203 and the second image display unit 204 of the LCD image area. The second lens 205 corresponds to the first image display unit 203, and the third lens 206 corresponds to the second image display unit 204. These lenses work in conjunction with the first projection unit 207 and the second projection unit 208 to project the corresponding images from the first image display unit 203 and the second image display unit 204 onto the screen 100, forming images in areas 101 and 102, respectively.

[0080] Furthermore, the image source selection liquid crystal light valve 202 consists of a first glass substrate 301 (i.e., the upper glass substrate), a first electrode layer 304 attached to the first glass substrate 301; and a second glass substrate 302 (i.e., the lower glass substrate), a first target electrode layer 306 and a second target electrode layer 307 attached to the second glass substrate 302.

[0081] Specifically, refer to Figure 2 As shown, the first target electrode layer 306 and the second target electrode layer 307 can be located on the same layer on the second glass substrate 302, with a fine gap between them. The smaller the gap, the better. If a twisted nematic (TN) process is used, it can generally be controlled within 20 micrometers. If a thin film transistor (TFT) process is used, it can generally be controlled within 5 micrometers.

[0082] Or, refer to Figure 3As shown, the first target electrode layer 306 and the second target electrode layer 307 can be located as upper and lower layers on the second glass substrate 302, that is, they are partially overlapping. The overlapping part of the structure can be isolated by an insulating coating, thus completely eliminating the gap. Because the existence of the gap may cause light to form stripes due to the difference in refractive index when passing through the image source selective liquid crystal light valve 202.

[0083] A reflective polarizer 303 is attached to the lower side of the second glass substrate 302, with the reflective surface facing downwards, i.e., towards the side where the light source module 200 is located. Thus, the light emitted from the light source module 200, after passing through the reflective polarizer 303, becomes polarized P-light. The S-polarized component of this light is reflected back into the structure containing the light source module 200, undergoing multiple reflections and refractions to become a mixture of P-light and S-light. This mixture is then reflected again and passes through the reflective polarizer 303, continuing to transmit P-light and reflecting back S-light. This increases the transmittance of P-light and reduces its impact on brightness.

[0084] Between the first glass substrate 301 and the second glass substrate 302, which have electrode layers, there is a TN liquid crystal layer that is twisted at 90°. The liquid crystal layer can rotate the P-light obtained by the reflective polarizer 303 by 90° to obtain S-light. After passing through the first glass substrate 301, the S-light can penetrate the second glass substrate 302, which also allows S-light to pass through, to provide illumination for the images of the corresponding first image display unit 203 and second image display unit 204.

[0085] If a liquid crystal saturation voltage is applied to the region of the first target electrode layer 306, and no voltage is applied to the second target electrode layer 307, the liquid crystal molecules in the region corresponding to the first target electrode layer 306 will be driven to align perpendicularly to the glass substrate, thus losing their rotational effect on polarized light. This ensures that P-light is emitted from the region on the first glass substrate 301 corresponding to the first target electrode layer 306. Similarly, if a liquid crystal saturation voltage is applied to the region of the second target electrode layer 307, and no voltage is applied to the first target electrode layer 306, the liquid crystal molecules in the region corresponding to the second target electrode layer 307 will be driven to align perpendicularly to the glass substrate, thus losing their rotational effect on polarized light. This ensures that P-light is emitted from the region on the first glass substrate 301 corresponding to the second target electrode layer 307.

[0086] Assuming the area of ​​the first target electrode layer 306 corresponds to the first image display unit 203, and the area of ​​the second target electrode layer 307 corresponds to the second image display unit 204, if the first image display unit 203 and the second image display unit 204 respectively display left and right eye views with parallax, by changing the voltage of the first target electrode layer 306 and the second target electrode layer 307, the image of the left eye or the right eye can be selectively projected onto the projection screen through the projection lens to form a magnified real image.

[0087] If the lens corresponding to the view on the LCD shutter glasses 500 is opened and the other is closed at the same time, it can be ensured that the left or right eye always sees the corresponding view. Stereoscopic vision can be formed by the rapid synchronous switching of the image source selection LCD light valve 202 and the LCD shutter glasses 500.

[0088] In a first specific embodiment, when the first image display unit 203 and the second image display unit 204 are independent image display screens, that is, the system includes two LCDs, namely the first image display unit 203 and the second image display unit 204. An image source selection liquid crystal light valve 202 is placed between the first lens and the first image display unit 203 and the second image display unit 204. The area of ​​the image source selection liquid crystal light valve 202 is approximately equal to the sum of the areas of the first image display unit 203 and the second image display unit 204.

[0089] First, the left-eye view is displayed on the first image display unit 203, and the right-eye view is displayed on the second image display unit 204. At time T0, the first target electrode layer 306 on the image source selection liquid crystal light valve 202 is not saturated with voltage, while the second target electrode layer 307 is saturated with voltage. The first image display unit 203 is illuminated by the light source module 200, while the second image display unit 204 is not illuminated by the light source module 200. The light from the first image display unit 203 passes through the second lens 205, then through the first projection unit 207, and reaches the projection screen. Only the left-eye view is projected onto the projection screen. At this time, the left-eye light valve lens 501 of the liquid crystal shutter glasses 500 is opened synchronously, and the right-eye light valve lens 502 is closed, thus ensuring that only the left eye can see the left-eye view on the projection screen.

[0090] At time T1, a saturation voltage is applied to the first target electrode layer 306 on the image source selection liquid crystal light valve 202, while no saturation voltage is applied to the second target electrode layer 307. The second image display unit 204 is illuminated by the light from the light source module 200, while the first image display unit 203 is not illuminated. The light from the second image display unit 204 passes through the third lens 206, then through the second projection unit 208, and reaches the projection screen. Only the right-eye view is projected onto the projection screen. At this time, the right-eye light valve lens 502 of the liquid crystal shutter glasses 500 is simultaneously opened, while the left-eye light valve lens 501 is closed, ensuring that only the right eye can see the right-eye view on the projection screen.

[0091] When the voltage switching of the image source selection liquid crystal light valve 202 and the lens switch switching on the liquid crystal shutter glasses 500 are fast and synchronized, the viewer can form a stereoscopic vision. The advantage of this embodiment is that it uses two LCDs, allowing each view to maintain high-resolution imaging.

[0092] In a second specific embodiment, when the first image display unit and the second image display unit share a single image display screen, that is, the system includes an LCD, which is divided into a first image display unit 203 and a second image display unit 204. An image source selection liquid crystal light valve 202 is placed between the first lens and the first image display unit 203 and the second image display unit 204. The area of ​​the image source selection liquid crystal light valve 202 is approximately equal to the sum of the areas of the first image display unit 203 and the second image display unit 204.

[0093] First, the left-eye view is displayed on the first image display unit 203, and the right-eye view is displayed on the second image display unit 204. At time T0, the first target electrode layer 306 on the image source selection liquid crystal light valve 202 is not saturated with voltage, while the second target electrode layer 307 is saturated with voltage. The first image display unit 203 is illuminated by the light source module 200, while the second image display unit 204 is not illuminated by the light source module 200. The light from the first image display unit 203 passes through the second lens 205, then through the first projection unit 207, and reaches the projection screen. Only the left-eye view is projected onto the projection screen. At this time, the left-eye light valve lens 501 of the liquid crystal shutter glasses 500 is opened synchronously, and the right-eye light valve lens 502 is closed, thus ensuring that only the left eye can see the left-eye view on the projection screen.

[0094] At time T1, a saturation voltage is applied to the first target electrode layer 306 on the image source selection liquid crystal light valve 202, while no saturation voltage is applied to the second target electrode layer 307. The second image display unit 204 is illuminated by the light from the light source module 200, while the first image display unit 203 is not illuminated. The light from the second image display unit 204 passes through the third lens 206, then through the second projection unit 208, and reaches the projection screen. Only the right-eye view is projected onto the projection screen. At this time, the right-eye light valve lens 502 of the liquid crystal shutter glasses 500 is simultaneously opened, while the left-eye light valve lens 501 is closed, ensuring that only the right eye can see the right-eye view on the projection screen.

[0095] The advantage of this embodiment compared to the first specific embodiment is that it reduces the number of LCDs, saving costs, and the resolution that can be provided by the same LCD is divided into two image regions.

[0096] This application may select the corresponding first specific embodiment or the first specific embodiment according to different product positioning, and this application does not impose any restrictions.

[0097] Reference Figure 4 As shown in the embodiments of this application, a control method for a three-dimensional projection system is also provided, which is applied to, for example... Figures 1 to 3The aforementioned three-dimensional projection system further includes a light valve control module 400. The control method of this application is executed by the light valve control module 400, and the control method includes:

[0098] Step 41: At a first moment, a first voltage signal is output to the first light-transmitting unit in the image source selection liquid crystal light valve, and a second voltage signal is output to the second light-transmitting unit in the image source selection liquid crystal light valve; the first voltage signal is used to put the first light-transmitting unit into a first light-transmitting state; the second voltage signal is used to put the second light-transmitting unit into a second light-transmitting state; at the first moment, the image output control of the image display module is controlled, and the left eye image is displayed in the first image display unit corresponding to the image display module;

[0099] Step 42: At the second moment, the second voltage signal is output to the first light-transmitting unit, and the first voltage signal is output to the second light-transmitting unit; at the second moment, the image output control of the image display module is controlled, and the right eye image is displayed in the second image display unit corresponding to the image display module.

[0100] In this embodiment, the first voltage signal is an applied voltage of 0; the second voltage signal is an applied liquid crystal saturation voltage. The first light-transmitting unit corresponds to... Figure 2 or Figure 3 The first target electrode layer 306 of the liquid crystal light valve is selected as the image source; the second light-transmitting unit corresponds to... Figure 2 or Figure 3The second target electrode layer 307 of the image source selection liquid crystal light valve. At a first moment, a 0 voltage is output to the first light-transmitting unit in the image source selection liquid crystal light valve, and a liquid crystal saturation voltage is output to the second light-transmitting unit in the same valve, causing the first light-transmitting unit to be in a first light-transmitting state and the second light-transmitting unit to be in a second light-transmitting state. In the first light-transmitting state, the light-transmitting unit transmits a preset direction-polarized light beam; in the second light-transmitting state, the light-transmitting unit blocks the light beam. At the first moment, the light beam provided by the light source module is transmitted to the image source selection liquid crystal light valve after being straightened by the first lens. The image source selection liquid crystal light valve controls the first target electrode layer 306 to have a 0 voltage and the second target electrode layer 307 to have a liquid crystal saturation voltage, controlling the first image display unit 203 corresponding to the first target electrode layer 306 in the image display module to perform image output control, displaying the left eye image on the first image display unit 203 corresponding to the image display module. At the second moment, a liquid crystal saturation voltage is output to the first light-transmitting unit, and a zero voltage is output to the second light-transmitting unit. At the second moment, the second image display unit 204 of the image display module is controlled to output an image, and the right eye image is displayed on the second image display unit 204 corresponding to the second target electrode layer 307 of the image display module. The above process is similar to the first specific embodiment described above in this application.

[0101] This application periodically outputs different voltage signals to the first and second light-transmitting units in the image source selection liquid crystal light valve, ensuring that the left and right eyes see corresponding images with parallax, thereby forming stereoscopic vision in the brain.

[0102] Optionally, the system further includes: liquid crystal shutter glasses; in the case that the system includes a left-eye light valve lens and a right-eye light valve lens, the method further includes:

[0103] The voltage switching frequency of the image source selection liquid crystal light valve is controlled to be synchronized with the lens voltage switching frequency of the liquid crystal shutter glasses.

[0104] This application enables viewers to form a stereoscopic vision by rapidly and synchronously controlling the voltage switching of the image source selection light valve and the lens switch switching on the LCD shutter glasses.

[0105] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0106] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0107] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0108] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0109] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principles described in this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A three-dimensional projection system, characterized in that, include: A light source module, wherein the light source module is used to provide a light beam; A first lens and an image source selection liquid crystal light valve. The first lens is disposed on the light-emitting side of the light source module. The light beam provided by the light source module is transmitted to the image source selection liquid crystal light valve after being straightened by the first lens. The image source selection liquid crystal light valve includes at least two light-transmitting units, wherein each light-transmitting unit is capable of switching between a first light-transmitting state and a second light-transmitting state; in the first light-transmitting state, the light-transmitting unit is used to transmit preset direction polarized light of the light-emitting beam; in the second light-transmitting state, the light-transmitting unit is used to block the light-emitting beam. The system further includes: an image display module and a projection module; the image display module is disposed on the light-emitting side of the image source selection liquid crystal light valve, and includes at least two image display units, wherein each of the light-transmitting units corresponds to one of the image display units; The projection module is disposed on the light-emitting side of the image display module and includes at least two projection units. Each projection unit corresponds to one of the image display units, and each projection unit is used to project the preset direction polarized light that passes through the corresponding image display unit.

2. The three-dimensional projection system according to claim 1, characterized in that, The image source selection liquid crystal light valve includes: A first glass substrate and a second glass substrate disposed opposite to each other; At least two liquid crystal control units are located between the first glass substrate and the second glass substrate, and each liquid crystal control unit corresponds to one of the light-transmitting units; A reflective polarizer is used to transmit the P-light in the emitted light beam provided by the light source module and to emit the S-light in the emitted light beam back to the light source module. The reflective polarizer is disposed on the side of the second glass substrate opposite to the first glass substrate, and the distance between the second glass substrate and the light source module is less than the distance between the first glass substrate and the light source module.

3. The three-dimensional projection system according to claim 2, characterized in that, The liquid crystal control unit includes a first electrode layer, a second electrode layer, and a liquid crystal layer located between the first electrode layer and the second electrode layer, which are disposed opposite to each other. The first electrode layers of different liquid crystal control units are interconnected and constitute the same electrode layer; the second electrode layers of different liquid crystal control units are located on the same layer and there is a preset interval between adjacent second electrode layers, or the second electrode layers of different liquid crystal control units are located on different layers and the overlapping structure between the connected second electrode layers is made of insulating material.

4. The three-dimensional projection system according to claim 1, characterized in that, The image display module includes: A first image display unit and a second image display unit, wherein the light-incident side of the first image display unit is disposed opposite to the area of ​​the first light-transmitting unit of the image source selection liquid crystal light valve, and the light-incident side of the second image display unit is disposed opposite to the area of ​​the second light-transmitting unit of the image source selection liquid crystal light valve; the first light-transmitting unit and the second light-transmitting unit have the same area as the corresponding image display unit.

5. The three-dimensional projection system according to claim 4, characterized in that, The first image display unit and the second image display unit are each independent image display screens; or, The first image display unit and the second image display unit share a common image display screen.

6. The three-dimensional projection system according to claim 4, characterized in that, The projection module includes: A first projection unit and a second projection unit, wherein the first projection unit projects light polarized in a preset direction corresponding to the first image display unit, and the second projection unit projects light polarized in a preset direction corresponding to the second image display unit.

7. The three-dimensional projection system according to claim 1, characterized in that, The system also includes: The second lens and the third lens, wherein the second lens is located on the light-emitting side of the image display module; The light polarized in the preset direction by the image display module is straightened by the second lens and the third lens and then transmitted to the corresponding projection module.

8. The three-dimensional projection system according to claim 6, characterized in that, The system also includes: The liquid crystal shutter glasses include a left-eye light valve lens and a right-eye light valve lens; the left-eye light valve lens is used to display a first image formed by the first projection unit; the right-eye light valve lens is used to display a second image formed by the second projection unit.

9. A control method for a three-dimensional projection system, characterized in that, Applied to the three-dimensional projection system as described in any one of claims 1 to 8, comprising: At a first moment, a first voltage signal is output to the first light-transmitting unit in the image source selection liquid crystal light valve, and a second voltage signal is output to the second light-transmitting unit in the image source selection liquid crystal light valve; the first voltage signal is used to put the first light-transmitting unit into a first light-transmitting state; the second voltage signal is used to put the second light-transmitting unit into a second light-transmitting state; at the first moment, the image output control of the image display module is controlled, and the left eye image is displayed in the first image display unit corresponding to the image display module; At the second moment, the second voltage signal is output to the first light-transmitting unit, and the first voltage signal is output to the second light-transmitting unit; at the second moment, the image output control of the image display module is controlled, and the right eye image is displayed in the second image display unit corresponding to the image display module.

10. The control method according to claim 9, characterized in that, The system further includes: liquid crystal shutter glasses; in the case of a left-eye light valve lens and a right-eye light valve lens, the method further includes: The voltage switching frequency of the image source selection liquid crystal light valve is controlled to be synchronized with the lens voltage switching frequency of the liquid crystal shutter glasses.

Images