3D projection system

Abstract

The embodiment of the utility model provides a 3D projection system, and the system comprises 3D projection equipment which comprises a light source module, a single-chip display light valve, and a polarized light processing element. The light source module is used for emitting polarized light to the display light valve; the display light valve is used for displaying a 3D display image, polarized light of an emergent surface of the display light valve has a polarization state in a specified direction, an area image displayed by a first display area of the display light valve is a left eye image, and an area image displayed by a second display area of the display light valve is a right eye image; and the polarized light processing element is arranged behind the emergent surface of the display light valve and is used for carrying out phase delay on at least one of the polarized light emitted by the first display area and the polarized light emitted by the second display area, so that the polarization state of the left eye image is different from that of the right eye image. According to the invention, the problem that the 3D effect in the 3D projection system is easy to cause image crosstalk due to poor alignment precision of left and right eye images is solved.

Description

Technical Field

[0001] This application relates to the field of projection technology, and more specifically, to a 3D projection system. Background Technology

[0002] Currently, 3D projection technology is used in cinemas, home entertainment, and other fields. The essence of 3D projection is to make the left eye see only the left view and the right eye see only the right view. A parallax is created between the left and right views, allowing the viewer to perceive depth and stereoscopic effect, thus making the image they are viewing appear as a 3D object. To ensure that the left eye sees only the left view and the right eye sees only the right view, the two views need to be isolated from each other.

[0003] LCD (Liquid Crystal Display) projectors are inexpensive, high-resolution projectors with rich colors and good image depth, making LCD 3D projection a highly cost-effective solution. In related technologies, LCD 3D projection typically employs a dual-LCD projection scheme, with the right-eye and left-eye images projected from two separate projectors. However, this scheme is not only bulky and expensive, but also requires precise alignment control of the two projectors, making the 3D effect susceptible to image crosstalk due to poor alignment accuracy between the left and right eye images.

[0004] It is evident that 3D projection systems in related technologies suffer from image crosstalk issues due to differences in the alignment accuracy of the left and right eye images. Utility Model Content

[0005] This application provides a 3D projection system to at least solve the problem in related technologies where the 3D effect is prone to image crosstalk due to the poor alignment accuracy of the left and right eye images in 3D projection systems.

[0006] According to one aspect of the embodiments of this application, a 3D projection system is provided, comprising: a 3D projection device, the 3D projection device including a light source module, a monolithic display light valve, and a polarization processing element; wherein, the light source module is used to emit polarized light to the display light valve; the display light valve is used to display a 3D display image, wherein the polarized light from the exit surface of the display light valve has a polarization state in a specified direction, the area image displayed in a first display area of ​​the display light valve is a left-eye image, and the area image displayed in a second display area of ​​the display light valve is a right-eye image; the polarization processing element is disposed after the exit surface of the display light valve, and is used to perform a phase delay on at least one of the polarized light emitted from the first display area and the polarized light emitted from the second display area, so that the polarization state of the left-eye image is different from the polarization state of the right-eye image.

[0007] According to another aspect of the embodiments of this application, a 3D projection device is also provided, comprising: a light source module, a monolithic display light valve, and a polarization light processing element; wherein, the light source module is used to emit polarized light to the display light valve; the display light valve is used to display a 3D display image, wherein the polarized light from the exit surface of the display light valve has a polarization state in a specified direction, the area image displayed in the first display area of ​​the display light valve is a left-eye image, and the area image displayed in the second display area of ​​the display light valve is a right-eye image; the polarization light processing element is disposed after the exit surface of the display light valve and is used to perform phase delay on the polarized light emitted from the first display area and the polarized light emitted from the second display area, so that the polarization state of the left-eye image is different from the polarization state of the right-eye image.

[0008] This application discloses a 3D projection system constructed based on polarization separation technology. The 3D projection system includes a 3D projection device, which comprises a light source module, a monolithic display light valve, and a polarization processing element. The light source module emits polarized light to the display light valve. The display light valve displays a 3D image, wherein the polarized light emitted from the exit surface of the display light valve has a polarization state in a specified direction. The first display area of ​​the display light valve displays a left-eye image, and the second display area displays a right-eye image. The polarization processing element is disposed after the exit surface of the display light valve. The light valve is used to delay the phase of at least one of the polarized light emitted from the first display area and the polarized light emitted from the second display area, so that the polarization state of the left-eye image is different from that of the right-eye image, thereby achieving parallax separation between the left-eye and right-eye images. Since a single-chip LCD liquid crystal light valve is used, the optical path structure is simple and the cost is low. Furthermore, there is no need to align the left and right eye images. Therefore, it can solve the problem of image crosstalk caused by poor alignment accuracy of the left and right eye images in 3D projection systems in related technologies, thereby achieving the technical effect of improving 3D projection effect and avoiding image crosstalk. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of a 3D projection system in related technologies;

[0010] Figure 2 This is a schematic diagram of another 3D projection system in related technologies;

[0011] Figure 3 This is a schematic diagram of an optional 3D projection system according to an embodiment of this application;

[0012] Figure 4 This is a structural block diagram of an optional 3D projection device according to an embodiment of this application;

[0013] Figure 5 This is a schematic diagram of an optional row segmentation strategy according to an embodiment of this application;

[0014] Figure 6 This is a schematic diagram of an optional row group segmentation strategy according to an embodiment of this application;

[0015] Figure 7 This is a schematic diagram of an optional polarization compensation film pixel according to an embodiment of this application;

[0016] Figure 8 This is a schematic diagram of an optional pixel block segmentation strategy according to an embodiment of this application;

[0017] Figure 9 This is a schematic diagram of another optional polarization compensation film pixel according to an embodiment of this application;

[0018] Figure 10 This is a computer system architecture block diagram of an optional electronic device according to an embodiment of this application. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, including a system, product, or device is not necessarily limited to those units explicitly listed, but may include other units not explicitly listed or inherent to such products or devices.

[0021] According to one aspect of the embodiments of this application, a 3D projection system is provided, which can be applied to the field of 3D (Three Dimensional) projection and to scenarios where 3D projection is performed using LCD projection devices. 3D projection mainly simulates the different viewing angles of the left and right eyes when viewing an object, transmitting two images with different viewing angles to each eye separately. The brain then recognizes the images to produce a stereoscopic effect. Most related technologies employ a dual-LCD projection scheme, where two projectors project polarized light with different polarization directions. Finally, the human eye needs to wear polarized glasses (also called polarized glasses) to independently observe the polarized images of the left and right eyes, achieving parallax between the left and right eyes.

[0022] However, dual-panel LCD 3D projection technology requires precise alignment of the left and right projected images, and the 3D effect is prone to image crosstalk due to poor alignment accuracy between the left and right eyes. Furthermore, dual-panel LCD 3D projection systems are bulky and have complex optical path structures; dual-panel LCDs also consume a lot of power, resulting in high production costs. In addition, shutter-based single-panel LCD 3D projection requires a high refresh rate, and the human eye is prone to dizziness due to the fast shutter speed.

[0023] For example, a related technology provides a dual-color LCD 3D projection display technology, in which two LCD projector optical engines emit RGB three primary color light, and the polarized light emitted by the two LCDs is perpendicular to each other. In the above scheme, the 3D effect is achieved by combining two LCD projectors, two polarizing lenses, and stereoscopic glasses. Figure 1 As shown, the 3D signal is simultaneously output to two LCD projectors with identical performance parameters. Polarizing lenses installed in front of the projector lenses filter the light horizontally and vertically, achieving image separation. Then, the images are viewed through polarized glasses worn by the user, with the horizontal and vertical images appearing separately to the left and right eyes, respectively. This creates an image superposition in the user's eyes, achieving a 3D effect. This technology requires two projection devices, increasing costs. Furthermore, assembling the two optical paths necessitates precise alignment and adjustment of each pixel in the left and right projected images, resulting in a large, inconvenient size, high production costs, and significant power consumption.

[0024] For example, a related technology provides a dual-LCD 3D projection display technology, in which the linear polarization directions of the two primary colors are the same, and the linear polarization direction of the other primary color is perpendicular to it, such as... Figure 2As shown. Similar to the previous scheme, the polarizers in front of the left and right projection lenses are still perpendicular to each other, simultaneously projecting two images of the same scene for the left and right eyes. The user needs to wear polarized glasses to separate the images for each eye. The difference from the previous scheme is that the output light from the projection optical engine is linearly polarized, with the two primary colors having the same polarization direction, and the other primary color having a polarization direction perpendicular to it. The red and blue LCD panels of one projection engine change from a normally dark mode to a normally bright mode, and the green LCD panel changes from a normally bright mode to a normally dark mode. The polarization state of the red, green, and blue output light is rotated by 90°, thus maintaining the system's light efficiency without rotating one of the optical engines. This scheme, because it still uses dual LCD optical engines, still suffers from problems such as large size, high cost, and the need for accurate pixel alignment.

[0025] In this embodiment, a single-chip LCD light valve is used, which has a simple optical path structure and low cost. Furthermore, a polarization light processing element is set after the emission surface of the display light valve. The polarization light processing element performs phase delay on the polarized light emitted from different display areas, thereby making the polarization state of the left-eye image different from that of the right-eye image, so as to achieve parallax separation between the left-eye image and the right-eye image. Then, the left and right lenses of polarized glasses can be used to receive the left-eye image and the right-eye image respectively. Since a single-chip LCD light valve is used, the technical problems existing due to the use of dual-chip LCD can be solved at least partially.

[0026] Another approach is to use a time-division multiplexing method to achieve single-panel LCD projection. This method involves alternately projecting the left-eye and right-eye images frame by frame. The shutter glasses worn by the user synchronously receive the frame synchronization signal and open or close the shutters of the left and right lenses in sync with the displayed image sequence, thus achieving image separation for the left and right eyes. However, this method uses expensive shutter glasses, requires a high frame rate from the LCD, and necessitates precise timing control of the LCD. Furthermore, prolonged use of these shutter glasses can easily cause visual fatigue. This embodiment, however, provides a polarized LCD 3D projection solution that achieves small size, low power consumption, and high cost-effectiveness.

[0027] As an optional implementation method, such as Figure 3As shown, the 3D projection system includes: a 3D projection device 300, which includes a light source module 302, a monolithic display light valve 304, and a polarization light processing element 306. The light source module 302 emits polarized light to the display light valve 304. The display light valve 304 displays a 3D image. The polarized light emitted from the exit surface of the display light valve 304 has a polarization state in a specified direction. The image displayed in the first display area of ​​the display light valve 304 is a left-eye image, and the image displayed in the second display area of ​​the display light valve 304 is a right-eye image. The polarization light processing element 306 is disposed after the exit surface of the display light valve 304 and is used to perform a phase delay on at least one of the polarized light emitted from the first display area and the polarized light emitted from the second display area, so that the polarization state of the left-eye image is different from that of the right-eye image.

[0028] The primary function of the light source module is to generate light and emit polarized light to the display light valve. It may include a light source for emitting light, which may include, but is not limited to, at least one of halogen lamps, mercury lamps, LEDs, and lasers. In some exemplary embodiments, in addition to providing a stable light source, the light source module may also include optical components (e.g., lenses, mirrors, filters, etc.) to adjust the direction and intensity of the light to meet the requirements of the display light valve. After passing through the optical components, the light emitted by the light source is shaped into a uniform parallel beam, and unwanted infrared and ultraviolet rays are removed by the filter to prevent damage to the display light valve. Furthermore, the light emitted by the light source can also be modulated into polarized light. The polarized light emitted by the light source module does not contain any image information.

[0029] A display light valve is an optical modulation device used to control the passage or reflection of light to form an image. When polarized light emitted by the light source module reaches the display light valve, the display light valve can modulate the polarized light according to the input image information, thereby projecting a 3D display image. In this embodiment, the display light valve can use a field-sequential monolithic LCD to achieve 3D projection, or it can use a monolithic color filter LCD to achieve the effect of 3D images.

[0030] The display light valve may include, but is not limited to, the following components: liquid crystal layer, display driving unit, and color filter. Polarized light enters the liquid crystal layer, and the liquid crystal molecules, under the control of the display driving chip, undergo an alignment change, thereby altering the polarization direction and transmittance of the light. The display driving unit receives image signals and distributes them to the individual pixel electrodes of the liquid crystal panel. By adjusting the electric field intensity and the alignment state of the liquid crystal molecules, a transition from completely transparent to completely opaque can be achieved, thus controlling the brightness and grayscale of the pixels. To achieve color display, an RGB color filter is also added to the liquid crystal panel. Each pixel consists of three sub-pixels: red, green, and blue. By controlling the brightness of the sub-pixels, various colors are synthesized. Finally, the light, after a series of modulations, forms an image.

[0031] An LCD panel consists of numerous tiny pixels, each containing three sub-pixels: red, green, and blue. Changing the transmittance of polarized light adjusts the transmittance of these three primary color sub-pixels. For example, when a pixel needs to display black, the liquid crystal molecules arrange themselves to block light, making that pixel completely opaque; conversely, when white needs to be displayed, the liquid crystal molecules arrange themselves to allow light to pass through, allowing light from all three sub-pixels to pass, thus mixing to produce white. For color displays, each pixel can include three sub-pixels (RGB), controlling the transmittance of red, green, and blue colors respectively. Through the selective transmission of color filters, different colors of light can be mixed to generate the desired color. For example, when displaying red, only the red sub-pixel is allowed to transmit light; when displaying green, only the green sub-pixel is allowed to transmit light. By controlling the transmittance through the arrangement of liquid crystal molecules, combined with the mixing principle of RGB sub-pixels, rich and precise color display can be achieved.

[0032] In this embodiment, the polarized light emitted from the light valve's exit surface has a polarization state with a specified direction. To facilitate the separation of left and right eye images with polarized glasses, the 3D display image can be divided into an area image displayed in the first display area of ​​the light valve and an area image displayed in the second display area of ​​the light valve. The area image displayed in the first display area is the left eye image, and the area image displayed in the second display area is the right eye image. This image division can be achieved through an image synthesis process; that is, the 3D display image used for 3D projection already meets the display requirements for the left and right eye images.

[0033] For polarized light emitted from the light valve's exit surface, the polarization direction can be controlled by a polarization processing element, thereby generating two images with different polarization directions and achieving image separation. The polarization processing element can be positioned after the light valve's exit surface, applying a corresponding phase delay to at least one of the polarized light emitted from the first display area and the polarized light emitted from the second display area, so that the polarization state of the left-eye image differs from that of the right-eye image. This difference in polarization state between the left and right-eye images can lead to a certain parallax, thus achieving stereoscopic vision (3D effect). To ensure accurate image separation, the polarization states of the left-eye and right-eye images can be orthogonal to each other.

[0034] For example, the polarization processing element can perform corresponding phase delays on the polarized light emitted from the first display area and the polarized light emitted from the second display area, respectively, so that the polarization state of the left-eye image is different from that of the right-eye image, satisfying the condition for a certain parallax. Considering that the polarized light emitted from the first and second display areas themselves have certain polarization directions, phase delay can also be performed on one of the polarized light emitted from the first and second display areas, as long as the parallax requirement of the polarization state of the left-eye image and the right-eye image is met.

[0035] It should be noted that the first display area and the second display area can be set as needed. They can be set by row (single or multiple rows), by column (single or multiple columns), or by pixel block (e.g., 2*2 pixel block, 3*3 pixel block). In this embodiment, the division method of the first display area and the second display area is not limited.

[0036] Polarized light, after being processed by a polarization processing element, can be projected onto a projection screen. The projection screen is used to display left-eye and right-eye images with different polarization states. Here, the projection screen refers to the medium on which the 3D display image is projected, which may include, but is not limited to, at least one of the following: a screen (e.g., a white screen, a gray screen, an anti-glare screen, etc.), a wall, or a floor. In this embodiment, the type of projection screen is not limited.

[0037] To view 3D images on a projection screen, polarized glasses are required, such as... Figure 4 The 3D projection device 300 shown projects images onto a projection screen 402, and viewers can view the 3D images displayed on the projection screen through polarized glasses 404. Here, the polarized glasses include a left lens and a right lens, used for polarization direction matching to receive the left-eye image through the left lens and the right-eye image through the right lens. The polarization direction of the left lens matches the polarization direction of the left-eye image, and the polarization direction of the right lens matches the polarization direction of the right-eye image. Therefore, the left lens can receive the left-eye image, and the right lens can receive the right-eye image, achieving separation of the left and right eye parallax images. Compared to shutter-type 3D glasses that rapidly alternate between displaying left-eye and right-eye images, polarized glasses-type 3D displays are passive devices that do not require power to change their polarization state and avoid the dizziness often caused by shutter-type 3D glasses. The projection screen 402 and the polarized glasses 404 can be part of the 3D projection system or independent of it.

[0038] According to the embodiments provided in this application, a 3D projection system includes: a 3D projection device, comprising a light source module, a monolithic display light valve, and a polarization processing element; wherein, the light source module is used to emit polarized light to the display light valve; the display light valve is used to display a 3D display image, wherein the polarized light emitted from the exit surface of the display light valve has a polarization state in a specified direction, the area image displayed in the first display area of ​​the display light valve is a left-eye image, and the area image displayed in the second display area of ​​the display light valve is a right-eye image; the polarization processing element is disposed after the exit surface of the display light valve and is used to perform phase delay on at least one of the polarized light emitted from the first display area and the polarized light emitted from the second display area, so that the polarization state of the left-eye image is different from that of the right-eye image, thereby solving the problem of poor alignment accuracy and image crosstalk in the 3D projection display systems of related technologies, improving the alignment accuracy of the left and right-eye images, and avoiding image crosstalk.

[0039] In one exemplary embodiment, the polarization processing element includes: a polarization compensation film for performing a first phase delay on polarized light emitted from a first display area and a second phase delay on polarized light emitted from a second display area, so that the polarization state of the left-eye image is perpendicular to the polarization state of the right-eye image.

[0040] In this embodiment, to reduce the size of the 3D projection device and improve the convenience of polarized light processing, the polarization light processing element may include a polarization compensation film. A polarization compensation film is an optical thin film that can apply a specific phase delay to polarized light passing through it. During the use of the polarization compensation film, including but not limited to adjusting its thickness and material properties to adapt to optical fibers of different wavelengths, good polarization effects are ensured in the display of images of different colors, enhancing system compatibility and display quality.

[0041] In this embodiment, the polarization compensation film is disposed after the emission surface of the display light valve and corresponds one-to-one with the pixels of the display light valve. The emission surface of the display light valve emits polarized light in the same direction. By adding the polarization compensation film, different phase delays can be applied to different display areas. Optionally, the polarization compensation film can apply a first phase delay to the polarized light emitted from the first display area and a second phase delay to the polarized light emitted from the second display area. By applying different phase delays, the polarization states of the left-eye image and the right-eye image can be precisely controlled, thereby making the polarization states of the left-eye image different from those of the right-eye image.

[0042] Optionally, to ensure accurate separation of the left and right eye images, the polarization state of the left eye image is perpendicular to the polarization state of the right eye image. When the polarization state of the left eye image is perpendicular to the polarization state of the right eye image, when a portion of the polarized light passes through the polarized glasses, it can completely block the other portion of polarized light that is 90° orthogonal, thus avoiding visual crosstalk between the left and right eyes and preventing any impact on the viewing experience of 3D projection.

[0043] To ensure that the polarization state of the left-eye image is perpendicular to that of the right-eye image, the first phase and the second phase can differ by λ / 2, for example, the first phase is 0 and the second phase is -λ / 2. Optionally, the first phase can be λ / 4 and the second phase can be -λ / 4; or, the first phase can be -λ / 4 and the second phase can be λ / 4, where λ is the wavelength, which is the wavelength of the polarized light emitted by the light source module. By applying phase delays of λ / 4 and -λ / 4 to the first and second display areas, the polarized light in the display areas can be converted from linearly polarized light to right-handed circularly polarized light (corresponding to a phase delay of λ / 4) and left-handed circularly polarized light (corresponding to a phase delay of -λ / 4), respectively. Compared to linearly polarized light, circularly polarized light retains more light energy when passing through polarized glasses, reducing light energy loss and thus improving the overall brightness and color reproduction of the image; furthermore, it can ensure the symmetry of the human eye, avoiding crosstalk between the left and right eye images caused by the tilt of the polarized glasses, so that the viewing effect is not affected when the polarized glasses are tilted.

[0044] For example, a 3D projection device includes a light source, an LCD display light valve (i.e., an example of a display light valve, also called an LCD panel), and an intermediate optical system for imaging. A polarization compensation film is added after the LCD light-emitting surface to ensure that the polarized light from different display areas is perpendicular to each other. When the light emitted from the light source passes through the LCD display light valve, the light emitted from the emitting surface is polarized in the same direction. The added polarization compensation film delays the phase of the polarized light from different display areas in different directions, achieving orthogonal polarization states for the left and right eye images. This is then projected onto the projection screen through a projection lens. The human eye, by wearing polarized glasses with different polarization directions for the left and right lenses, separates the left and right eye images, achieving binocular parallax.

[0045] In this embodiment, by using a polarization compensation film to delay the polarized light of the two display areas in a specific phase, the polarization states of the polarized light of the two display areas can be made orthogonal, avoiding visual crosstalk and improving the effect of human eyes viewing 3D projection.

[0046] In an exemplary embodiment, the first display area is one of the two display areas of the display light valve, and the second display area is the other of the two display areas. The two display areas (i.e., the first display area and the second display area) can be obtained through various segmentation strategies. These various segmentation strategies may include, but are not limited to, at least one of the following: row segmentation strategy, column segmentation strategy, row group segmentation strategy, column group segmentation strategy, and pixel block segmentation strategy. Specifically, the row segmentation strategy separates the image according to rows, the column segmentation strategy separates the image according to columns, the row group segmentation strategy separates the image according to row groups, the column group segmentation strategy separates the image according to column groups, and the pixel block segmentation strategy separates the image according to pixel blocks. The segmentation strategy used for the two display areas can be selected according to the actual situation, and this embodiment does not limit it.

[0047] As an optional implementation, a row segmentation strategy can be adopted. The row segmentation strategy can be a strategy of separating the image according to odd-numbered rows and even-numbered rows. Correspondingly, the first display area (or the second display area) can be the display area corresponding to the odd-numbered rows of the display light valve and the 3D display image, and the second display area (or the first display area) can be the display area corresponding to the even-numbered rows of the display light valve and the 3D display image.

[0048] In this embodiment, image separation of odd-numbered rows and even-numbered rows can be performed. By splitting the 3D display image into a left-eye image and a right-eye image, in a single frame of display, the scan lines of odd-numbered rows can be scanned to form a left-eye image (or a right-eye image), and the scan lines of even-numbered rows can be scanned to form a right-eye image (or a left-eye image).

[0049] The polarization compensation film on the exit surface of the display light valve is a thin film with different phase differences arranged at intervals according to the correspondence with different display areas (first display area and second display area). That is, the polarization compensation film on the exit surface of the display light valve is arranged at intervals with different phase differences corresponding to the areas of the LCD row pixels. For example, even-numbered rows have a phase delay of λ / 4 (or -λ / 4), and odd-numbered rows have a phase delay of -λ / 4 (or λ / 4). Correspondingly, a part of the polarization compensation film on the exit surface of the display area has a phase delay of λ / 4, and another part has a phase delay of -λ / 4. In this way, the linearly polarized light projected from the LCD exit surface passes through this polarization phase delay film, and the even-numbered rows emit left-handed (or right-handed) and right-handed (or left-handed) polarized light, respectively.

[0050] like Figure 5As shown, polarized light projected from the output surface of the display light valve passes through a polarization compensation film (i.e., a polarization phase retardation film), resulting in even-numbered rows and odd-numbered rows emitting corresponding polarized light (left-handed or right-handed), with the polarization directions of the even-numbered and odd-numbered rows being orthogonal to each other. When wearing polarized glasses, the left and right eyes can only see the corresponding row pixels, thus achieving image separation and parallax in the 3D viewpoint.

[0051] As an alternative implementation, a column segmentation strategy can be employed, which can be a strategy of separating the image according to odd-numbered columns and even-numbered columns. Correspondingly, the first display area (or the second display area) can be the display area corresponding to the odd-numbered columns of the 3D display image and the display light valve, and the second display area (or the first display area) can be the display area corresponding to the even-numbered columns of the 3D display image and the display light valve. The process of segmenting by column in the column segmentation strategy is similar to the process of segmenting by row in the row segmentation strategy, and will not be described in detail here.

[0052] The aforementioned row and column separation strategies require high precision in the attachment and alignment of the polarization compensation film, making it difficult to achieve a one-to-one correspondence between each row / column pixel of the display light valve and the phase retardation film. Furthermore, in 3D projection systems, the display light valve is small, with pixels typically around 30µm. Therefore, the polarization compensation film exhibits significant deviations in the vertical / horizontal directions, potentially exceeding ±10µm, which can cause crosstalk between the left and right eye images in the 3D projection display. To avoid crosstalk, the black matrix (BM) of the display light valve can be widened; however, this reduces the transmittance of the light valve, significantly decreasing the brightness and luminous efficacy of the 3D image. Therefore, row or column group segmentation strategies can be employed for image separation.

[0053] As another optional implementation, a row group segmentation strategy can be adopted. This strategy can be to separate the image into odd-numbered and even-numbered row groups, where N is a positive integer greater than or equal to 2. Correspondingly, the first display area (or the second display area) can be the display area corresponding to the odd-numbered row groups of the 3D display image and the display light valve, and the second display area (or the first display area) can be the display area corresponding to the even-numbered row groups of the 3D display image and the display light valve.

[0054] In this embodiment, image separation can be performed between odd-numbered rows and even-numbered rows. By splitting the 3D display image into a left-eye image and a right-eye image, in a single frame of display, the scan lines of the odd-numbered rows can scan to form a left-eye image (or a right-eye image), and the scan lines of the even-numbered rows can scan to form a right-eye image (or a left-eye image).

[0055] The polarization compensation film on the exit surface of the display light valve can provide a λ / 4 (or -λ / 4) phase delay for even-numbered row groups and a -λ / 4 (or λ / 4) phase delay for odd-numbered row groups. Thus, linearly polarized light projected from the LCD exit surface passes through this polarization phase delay film, resulting in left-handed (or right-handed) and right-handed (or left-handed) polarized light exiting from the even-numbered and odd-numbered row groups, respectively.

[0056] For example, such as Figure 6 As shown, the LCD scanning design divides the 3D display image into alternating rows. For example, rows 1, 2, 5, 6, 9, 10... display the left-eye image (or right-eye image), and rows 3, 4, 7, 8, 11, 12... display the right-eye image (or left-eye image). Correspondingly, the polarization phase retardation film provides a λ / 4 (or -λ / 4) phase retardation for rows 1, 2, 5, 6, 9, 10... and a -λ / 4 (or λ / 4) phase retardation for rows 3, 4, 7, 8, 11, 12... Thus, one row of the polarization phase retardation film corresponds to two rows of pixels in the LCD display light valve, as shown... Figure 7 As shown. The alignment accuracy tolerance of the polarization phase retardation film is increased in the vertical direction, avoiding crosstalk between the left and right eyes in 3D projection without sacrificing transmittance. When wearing polarized glasses, the left eye (or right eye) can only see rows 1, 2, 5, 6, 9, 10… of pixels, while the right eye (or left eye) can only see rows 3, 4, 7, 8, 11, 12… of pixels, thus achieving image separation and parallax in the 3D viewing angle. Here, one row of the polarization phase retardation film corresponds to two rows of pixels in the display light valve, as shown... Figure 7 As shown, this can increase the alignment accuracy tolerance of the polarization phase retardation film in the vertical direction, avoiding crosstalk between the left and right eyes in 3D projection without sacrificing transmittance.

[0057] As another optional implementation, a column group segmentation strategy can be adopted. This strategy can be to separate the image into M columns, with odd-numbered and even-numbered columns, where M is a positive integer greater than or equal to 2. Correspondingly, the first display area (or the second display area) can be the display area corresponding to the odd-numbered column group of the 3D display image, and the second display area (or the first display area) can be the display area corresponding to the even-numbered column group of the 3D display image. The process of segmenting by column group using the column group segmentation strategy is similar to that of segmenting by row group using the row group segmentation strategy, and will not be described again here.

[0058] As another optional implementation, to achieve 3D projection effects and make the human eye less sensitive to row and column segmentation, a pixel partitioning approach (i.e., pixel block segmentation strategy) can be used for image separation. This ensures the uniformity of resolution for human eye recognition of rows and columns, improving eye comfort. The pixel block segmentation strategy can divide the 3D display image into M*N pixel blocks according to M rows and N columns, and then further divide these M*N pixel blocks into multiple groups of pixel blocks by alternating row and column directions. No two first display areas in any row or column are adjacent, and no two second display areas are adjacent either. Here, M and N are both positive integers greater than or equal to 2. Correspondingly, the first display area can be the display area corresponding to the first group of pixel blocks of the 3D display image and the display valve, and the second display area can be the display area corresponding to the second group of pixel blocks of the 3D display image and the display valve.

[0059] For example, the LCD scanning design can be modified to invert the pixel partitioning of the 3D display image. For instance, pixels in rows 1 and 2, and columns 1 and 2, etc., display the left-eye (or right-eye) image, while pixels in rows 3 and 4, and columns 3 and 4, etc., display the right-eye (or left-eye) image. A synchronous polarization phase retardation film provides a λ / 4 (or -λ / 4) phase retardation for pixels in rows 1 and 2, and columns 1 and 2, etc., and a -λ / 4 (or λ / 4) phase retardation for pixels in rows 3 and 4, etc., such as... Figure 8 As shown; and the correspondence between the polarization phase retardation film and the LCD display light valve pixels is as follows. Figure 9 As shown. This not only increases the alignment accuracy tolerance of the polarization phase retardation film and avoids crosstalk between the left and right eyes in the display of 3D projection images, but also ensures the uniformity of resolution in the recognition rows for the human eye, thus improving the comfort of the human eye.

[0060] This embodiment provides different display area segmentation strategies, including segmentation according to rows, columns, row groups, column groups, and pixel blocks, to avoid crosstalk between the left and right eyes of the 3D projected image, thereby optimizing the display effect of the 3D projection device.

[0061] In one exemplary embodiment, the polarized glasses include a width-adjustable mechanism for adjusting the spacing between the left and right lenses based on the detected interpupillary distance of the wearer.

[0062] Here, the width-adjustable mechanism can automatically or manually adjust the distance between the left and right lenses according to the wearer's interpupillary distance, ensuring accurate alignment of the left and right eye images. At the same time, it can also ensure that the left and right lenses of the polarized glasses match the wearer's interpupillary distance, avoiding image overlap or misalignment (i.e., image crosstalk) caused by differences in interpupillary distance, thus improving the comfort and accuracy of stereoscopic vision.

[0063] The pupillary distance (PD) detection module can be integrated into the lenses or frame of polarized glasses. It automatically measures the wearer's PD using an infrared sensor or other non-contact measurement technology, providing adjustment parameters for the width-adjustable mechanism. Optionally, when the wearer wears the polarized glasses, the PD detection module immediately activates, using infrared or image recognition technology to measure the distance between the wearer's eyes, obtaining the PD. This measured PD data is then sent to the width-adjustable mechanism. Based on the received PD data, the width-adjustable mechanism drives the lens frame or sliding mechanism to automatically adjust the spacing between the left and right lenses to achieve the theoretically optimal image alignment.

[0064] In this embodiment, in addition to the automatic adjustment function, a manual fine-tuning option is also provided. The wearer can manually adjust the lens spacing using the fine-tuning knob on the glasses according to their personal visual comfort. This spacing adjustment can be fine-tuned to ensure the most comfortable 3D visual experience.

[0065] Through this embodiment, the adjustable-width mechanism allows polarized glasses to adapt to wearers with different interpupillary distances, avoiding image crosstalk caused by inaccurate lens alignment.

[0066] In one exemplary embodiment, the light source module includes: a light source for emitting light; and a polarizing filter disposed between the light source and the display light valve for converting the light emitted from the light source into polarized light, wherein the polarization direction of the converted polarized light matches the polarization sensitive direction of the display light valve.

[0067] The light source module is a component in a 3D projection system that generates light and performs preliminary optical processing. Considering that the display light valve needs polarized light to display the image, in this embodiment, the light source module may include a light source and a polarizing filter. Here, the light source is used to generate and provide light with sufficient brightness to support subsequent 3D projection display; it can be an LED light source, a laser light source, etc. The polarizing filter only allows light with a specific polarization direction to pass through, while filtering out light with other directions, ensuring that the emitted light is polarized light. That is, the polarizing filter can convert unpolarized light into polarized light.

[0068] Here, a polarizing filter is placed behind the light source to convert the unpolarized light generated by the light source into polarized light. Since the liquid crystal molecules in the display light valve are only sensitive to light with a specific polarization direction, the polarized light generated by the polarizing filter needs to match the arrangement of the liquid crystal molecules in the display light valve. That is, the polarization direction of the polarized light converted by the polarizing filter matches the polarization-sensitive direction of the display light valve (a specific direction determined by the arrangement of the liquid crystal molecules) to ensure that the light can effectively pass through the display light valve for image display.

[0069] For example, the LED light source in the light source module emits unpolarized light. This unpolarized light first passes through a polarizer, which converts the unpolarized light into vertically polarized light that matches the direction of the display light valve. The display light valve then receives and processes the converted vertically polarized light.

[0070] In this embodiment, by using a polarizing filter to convert the light emitted from the light source into polarized light that matches the polarization-sensitive direction of the display light valve, it can be ensured that the light passes through the display light valve with the highest efficiency.

[0071] In one exemplary embodiment, the light source module includes a temperature control device for controlling the temperature of the light source module so that the light source module operates within a preset temperature range.

[0072] During operation, excessively high temperatures in the light source module will accelerate its aging process, while excessively low temperatures may affect its startup and efficiency. To prevent damage from overheating or underheating and to extend its lifespan, temperature control can be implemented for the light source module.

[0073] In this embodiment, a temperature control device can be introduced into the light source module to detect and adjust the internal temperature of the light source module, ensuring that the light source module operates within the optimal temperature range and avoiding performance degradation due to excessively high or low temperatures. This ensures the stability of the light source module and reduces display failures in the 3D projection system caused by fluctuations in the light source module.

[0074] Here, the optimal temperature range of the light source module can be preset according to the characteristics of the light source. The temperature control device may include, but is not limited to, a temperature sensor, a control module, a heat dissipation module, and a heating module. Optionally, the temperature sensor can continuously monitor the real-time temperature of the light source module. When the temperature of the light source module exceeds the preset temperature range (the preset optimal temperature range), the control module can automatically make corresponding adjustments. If the temperature of the light source module is too high, the control module can dissipate heat from the light source module through the heat dissipation module, such as through a cooling fan or liquid cooling system. If the temperature of the light source module is too low, the control module can heat the light source module through the heating module, such as through a heat pipe or heating element, to ensure that the light source module operates within the preset temperature range.

[0075] In this embodiment, by introducing a temperature control device into the light source module, the temperature of the light source module can be controlled within a preset temperature range, thereby improving the stability and service life of the light source module.

[0076] In one exemplary embodiment, the 3D projection device further includes a polarizer disposed between the exit surface of the display light valve and the polarization processing element, for selecting the polarized light emitted from the exit surface of the display light valve so that the polarized light entering the polarization processing element is polarized light of the same direction.

[0077] During the modulation of polarized light by the display light valve based on the input image information, due to the response characteristics of liquid crystal molecules and the limitations of electric field control, the polarization state of the polarized light may not be modulated exactly as designed, resulting in deviations in the polarization direction of some polarized light. This deviation affects the quality of the 3D image, including sharpness, contrast, and stereoscopic effect. Therefore, a polarizing filter can be placed between the exit surface of the display light valve and the polarization processing element. The polarizing filter can selectively allow light with a specific polarization direction to pass through while blocking polarized light with other directions, thus filtering out light with mismatched polarization directions (i.e., deviations) and improving the image quality of the 3D projection.

[0078] Optionally, the polarization direction of the polarizer can be set to match the natural alignment of the liquid crystal molecules inside the display light valve when no electric field is applied. When the polarized light emitted from the display light valve reaches the polarizer, the polarizer only allows polarized light with the same polarization direction as itself to pass through, while blocking polarized light with other directions. The polarized light passing through the polarizer has a completely unified polarization direction, becoming polarized light in the same direction. In other words, the polarized light subsequently entering the polarization processing element is polarized light with a unified direction. This avoids the influence of non-target polarized light on the light processing element, thereby improving the image separation efficiency of the polarization processing element.

[0079] In this embodiment, a polarizer is used to ensure that the polarization direction of the polarized light emitted from the display light valve is consistent, thereby ensuring that the polarization direction of the polarized light entering the polarization light processing element is consistent. This can improve the efficiency of the subsequent polarization light processing element in image separation and achieve high-quality 3D projection.

[0080] It should be noted that the above modules can be implemented by software or hardware. For the latter, they can be implemented in the following ways, but are not limited to: all the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0081] According to another aspect of the embodiments of this application, a 3D projection device is also provided. The 3D projection device may be the 3D projection device in the 3D projection system provided in the above embodiments, and will not be described again as already described.

[0082] Combination Figure 3The block diagram of the 3D projection device in the 3D projection system shown in this embodiment includes: a light source module 302, a monolithic display light valve 304, and a polarization light processing element 306; wherein:

[0083] The light source module 302 is used to emit polarized light to the display light valve 304;

[0084] The display light valve 304 is used to display a 3D display image. The polarized light emitted from the exit surface of the display light valve 304 has a polarization state in a specified direction. The area image displayed in the first display area of ​​the display light valve 304 is the left-eye image, and the area image displayed in the second display area of ​​the display light valve 304 is the right-eye image.

[0085] The polarization processing element 306 is disposed after the emission surface of the display light valve 304 and is used to perform phase delay on the polarization light emitted from the first display area and the polarization light emitted from the second display area so that the polarization state of the left eye image is different from that of the right eye image.

[0086] According to the embodiments provided in this application, a 3D projection device includes: a light source module, a monolithic display light valve, and a polarization light processing element; wherein, the light source module is used to emit polarized light to the display light valve; the display light valve is used to display a 3D display image, wherein the polarized light emitted from the exit surface of the display light valve has a polarization state in a specified direction, the area image displayed in the first display area of ​​the display light valve is a left-eye image, and the area image displayed in the second display area of ​​the display light valve is a right-eye image; the polarization light processing element is disposed after the exit surface of the display light valve, and is used to perform phase delay on at least one of the polarized light emitted from the first display area and the polarized light emitted from the second display area, so that the polarization state of the left-eye image is different from that of the right-eye image, thereby solving the problem in related technologies where the 3D effect in 3D projection systems is prone to image crosstalk due to the poor alignment accuracy of the left and right eye images, and thus achieving the technical effect of improving the 3D projection effect and avoiding image crosstalk.

[0087] In one exemplary embodiment, the polarization processing element includes: a polarization compensation film for performing a first phase delay on polarized light emitted from a first display area and a second phase delay on polarized light emitted from a second display area, so that the polarization state of the left-eye image is perpendicular to the polarization state of the right-eye image.

[0088] In one exemplary embodiment, the first phase is λ / 4 and the second phase is -λ / 4; or, the first phase is -λ / 4 and the second phase is λ / 4, where λ is the wavelength.

[0089] In one exemplary embodiment, the first display area is one of two display areas of the display light valve, and the second display area is the other of the two display areas; wherein, the two display areas are one of the following: a display area corresponding to an odd-numbered row of the 3D display image and a display area corresponding to an even-numbered row of the 3D display image; a display area corresponding to an odd-numbered column of the 3D display image and a display area corresponding to an even-numbered column of the 3D display image; a display area corresponding to an odd-numbered group of rows of the 3D display image and a display area corresponding to an even-numbered group of rows of the 3D display image, wherein, in the 3D display image, a group of rows includes Two consecutive rows, with different rows comprising distinct rows; the display area corresponding to the odd-numbered column groups of the display light valve and the 3D display image, and the display area corresponding to the even-numbered column groups of the display light valve and the 3D display image, wherein in the 3D display image, a column group comprises two consecutive columns, with different columns comprising distinct columns; the display area corresponding to the first group of pixel blocks of the display light valve and the 3D display image, and the display area corresponding to the second group of pixel blocks of the display light valve and the 3D display image, wherein the 3D display image is divided into a first group of pixel blocks and a second group of pixel blocks according to M rows and N columns, and the pixel blocks in the first group and the second group of pixel blocks are arranged alternately in the row direction and the column direction, where M and N are both positive integers greater than or equal to 1.

[0090] In one exemplary embodiment, the light source module includes: a light source for emitting light; and a polarizing filter disposed between the light source and the display light valve for converting the light emitted from the light source into polarized light, wherein the polarization direction of the converted polarized light matches the polarization sensitive direction of the display light valve.

[0091] In one exemplary embodiment, the light source module includes a temperature control device for controlling the temperature of the light source module so that the light source module operates within a preset temperature range.

[0092] In one exemplary embodiment, the 3D projection device further includes a polarizer disposed between the exit surface of the display light valve and the polarization processing element, for selecting the polarized light emitted from the exit surface of the display light valve so that the polarized light entering the polarization processing element is polarized light of the same direction.

[0093] It should be noted that the above modules can be implemented by software or hardware. For the latter, they can be implemented in the following ways, but are not limited to: all the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0094] According to another aspect of the embodiments of this application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein the program executes the steps in any of the above method embodiments when it is run.

[0095] In one exemplary embodiment, the aforementioned computer-readable storage medium may include, but is not limited to, various media capable of storing computer programs, such as USB flash drives, ROMs, RAMs, portable hard drives, magnetic disks, or optical disks.

[0096] According to another aspect of the embodiments of this application, a computer program product is also provided, comprising a computer program / instructions containing program code for performing the methods shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via communication section 1009, and / or installed from removable medium 1011. When the computer program is executed by central processing unit 1001, it performs various functions provided in the embodiments of this application. The sequence numbers of the embodiments of this application above are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0097] Figure 10 This is a computer system architecture block diagram of an optional electronic device according to an embodiment of this application. For example... Figure 10 As shown, the computer system 1000 includes a CPU (Central Processing Unit) 1001, which can perform various appropriate actions and processes according to programs stored in ROM 1002 or programs loaded into RAM 1003 from storage section 1008. Random access memory 1003 also stores various programs and data required for system operation. The CPU 1001, ROM 1002, and RAM 1003 are interconnected via bus 1004. An I / O (Input / Output) interface 1005 is also connected to bus 1004.

[0098] The following components are connected to I / O interface 1005: input section 1006 including keyboard, mouse, etc.; output section 1007 including CRT (Cathode Ray Tube), LCD (Liquid Crystal Display), etc., and speakers, etc.; storage section 1008 including hard disk, etc.; and communication section 1009 including network interface card, modem, etc. Communication section 1009 performs communication processing via a network such as the Internet. Drive 1010 is also connected to I / O interface 1005 as needed. Removable media 1011, such as disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 1010 as needed so that computer programs read from them can be installed into storage section 1008 as needed.

[0099] Specifically, according to embodiments of this application, the processes described in the various method flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 1009, and / or installed from removable medium 1011. When the computer program is executed by central processing unit 1001, it performs various functions defined in the system of this application.

[0100] It should be noted that, Figure 10 The computer system 1000 of the electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0101] Obviously, those skilled in the art should understand that the modules or steps of this application described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, this application is not limited to any particular combination of hardware and software.

[0102] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the protection scope of this application.

Claims

1. A 3D projection system, characterized by, The application relates to a 3D projection device, which comprises a light source module, a single-chip display light valve and a polarized light processing element. The light source module is used for emitting polarized light to the display light valve. The display light valve is used for displaying a 3D display image, wherein the polarized light on the exit surface of the display light valve has a specified direction of polarization state, a region image displayed by a first display region of the display light valve is a left eye image, and a region image displayed by a second display region of the display light valve is a right eye image. The polarized light processing element is arranged behind the exit surface of the display light valve and is used for performing phase delay on at least one of the polarized light emitted by the first display region and the polarized light emitted by the second display region, so that the polarization state of the left eye image is different from the polarization state of the right eye image. The polarized light processing element comprises a polarization compensation film, which is used for performing phase delay on the polarized light emitted by the first display region and performing phase delay on the polarized light emitted by the second display region, so that the polarization state of the left eye image is perpendicular to the polarization state of the right eye image.

2. The 3D projection system of claim 1, wherein, The first phase is lambda / 4, and the second phase is -lambda / 4; or the first phase is -lambda / 4, and the second phase is lambda / 4, wherein lambda is wavelength. The first display region is one of two display regions of the display light valve, and the second display region is the other of the two display regions.

3. The 3D projection system of claim 2, wherein, The two display regions are one of the following:

4. The 3D projection system according to any one of claims 1 to 3, characterized in that, The display region corresponding to the odd rows of the 3D display image and the display region corresponding to the even rows of the 3D display image; The display region corresponding to the odd columns of the 3D display image and the display region corresponding to the even columns of the 3D display image; The display region corresponding to the odd row groups of the 3D display image and the display region corresponding to the even row groups of the 3D display image, wherein one row group comprises two continuous rows in the 3D display image, and the rows included in different row groups are different from each other; The display region corresponding to the odd column groups of the 3D display image and the display region corresponding to the even column groups of the 3D display image, wherein one column group comprises two continuous columns in the 3D display image, and the columns included in different column groups are different from each other; The display region corresponding to the first group of pixel blocks of the 3D display image and the display region corresponding to the second group of pixel blocks of the 3D display image, wherein the 3D display image is divided into the first group of pixel blocks and the second group of pixel blocks according to M rows and N columns, the pixel blocks in the first group of pixel blocks and the pixel blocks in the second group of pixel blocks are arranged in an interlaced manner in the row direction and the column direction, and M and N are both positive integers greater than or equal to 1. ​ ​ 5. The 3D projection system of claim 4, wherein, The polarized light processing element comprises a polarized compensation film, which comprises thin films with different phase differences arranged in a spaced manner according to the alignment relationship with the first display area and the second display area.

6. The 3D projection system of claim 4, wherein, The 3D projection system further comprises: Polarized glasses comprising a left eye lens and a right eye lens, configured to receive the left eye image through the left eye lens and the right eye image through the right eye lens based on polarized direction matching.

7. The 3D projection system of claim 6, wherein, The polarized glasses comprise: A width adjustable mechanism configured to adjust the distance between the left eye lens and the right eye lens based on the detected interpupillary distance of the wearer.

8. The 3D projection system of claim 4, wherein, The light source module comprises: A light source configured to emit light rays; A polarized light source configured to convert the light rays emitted by the light source into polarized light, and the polarized direction of the converted polarized light matches the polarized sensitive direction of the display light valve.

9. The 3D projection system of claim 4, wherein, The light source module comprises: A temperature control device configured to control the temperature of the light source module so that the light source module works within a preset temperature range.

10. The 3D projection system of claim 4, wherein, The 3D projection device further comprises: An analyzing polarized light source arranged between the exit surface of the display light valve and the polarized light processing element, configured to select the polarized light emitted by the exit surface of the display light valve so that the polarized light entering the polarized light processing element is polarized light with the same direction.

Images