Field sequential dual liquid crystal director backlight naked eye 3D display system and control method thereof

Abstract

The application relates to a field sequential dual liquid crystal directional backlight naked eye 3D display system and a control method thereof, and belongs to the 3D display field. The display system comprises a pupil tracking module, a control device, a monochromatic backlight source, a diffusion film layer, a first liquid crystal light valve, a lens array and a second liquid crystal light valve; the monochromatic backlight source, the diffusion film layer, the first liquid crystal light valve, the lens array and the second liquid crystal light valve are sequentially stacked. In the 3D display mode, the control device dynamically calculates the regulation and control combination of the first liquid crystal light valve according to the binocular three-dimensional coordinates of an observer obtained by the pupil tracking module, and cooperates with the lens array to accurately and directionally project light beams to the left eye or the right eye; meanwhile, the monochromatic backlight source and the second liquid crystal light valve are strictly aligned in time sequence, and high-speed alternation loading of left-eye and right-eye RGB color separation images is realized. The application solves the problem that the 3D resolution is reduced and it is difficult to simultaneously consider high-precision spatial deflection of light beams and high-frequency image loading due to the use of a single-sided liquid crystal architecture in the prior art.

Description

Technical Field

[0001] This application relates to the field of 3D display technology, and in particular to a field-sequence dual liquid crystal pointing backlight naked-eye 3D display system and its control method. Background Technology

[0002] With the continuous iteration and upgrading of display technology, naked-eye 3D (Autostereoscopic 3D) display technology has shown great application potential in fields such as medical imaging, industrial design, virtual reality (VR) and high-end consumer electronics because it can provide an immersive stereoscopic visual experience without the need to wear bulky 3D glasses.

[0003] The existing space reuse naked-eye 3D technology has achieved a certain degree of commercialization, but its underlying physical architecture determines that it has the following technical bottlenecks that are difficult to overcome: (1) Most of the current naked-eye 3D displays are based on traditional color liquid crystal panels, using field-sequential color (FSC) technology to eliminate color filters. However, the single-layer liquid crystal architecture is difficult to simultaneously take into account the high-precision spatial deflection of the beam and the loading of high-frequency images. Moreover, the response time of traditional liquid crystal materials is relatively slow, which cannot meet the ultra-high refresh rate required for filter-free field-sequential display, and is very easy to produce color breakup phenomenon; (2) The fixed optical grating makes the clear 3D viewing area extremely narrow. Once the viewer's head deviates from the center position, the phenomenon of reverse viewing or image blurring will immediately occur, which greatly restricts the user's free movement and viewing experience.

[0004] Therefore, there is an urgent need in this field for a completely new display architecture that can fundamentally eliminate the light loss caused by color filters, break through the resolution bottleneck caused by spatial reuse, and enable free viewing over a wide range without crosstalk, so as to meet the demand for high-brightness, full-resolution, high-quality naked-eye 3D display. Summary of the Invention

[0005] This application provides a field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system and its control method, which can solve the problems of reduced 3D display resolution and difficulty in simultaneously achieving high-precision spatial deflection of the beam and loading of high-frequency images due to the use of a single-sided liquid crystal architecture in the prior art.

[0006] To achieve the above objectives, according to a first aspect of this application, a field-sequential dual-liquid crystal pointing backlight naked-eye 3D display system is provided. The display system includes a pupil tracking module, a control device, a monochrome backlight, a diffusion film layer, a first liquid crystal light valve, a lens array, and a second liquid crystal light valve. The pupil tracking module acquires the three-dimensional spatial coordinates of the observer's pupils and transmits them to the control device. The control device controls the pupil tracking module to track the three-dimensional coordinates of the observer's pupils, calculates the on / off control combination of the first liquid crystal light valve, and controls the second liquid crystal light valve to sequentially load the stereoscopic image of the RGB channels. The monochrome backlight, diffusion film layer, first liquid crystal light valve, lens array, and second liquid crystal light valve are stacked sequentially along the direction of light propagation.

[0007] To achieve the above objectives, according to a second aspect of this application, a control method for a field-sequential dual-liquid crystal pointing backlight naked-eye 3D display system is also provided. The control method is applied to the field-sequential dual-liquid crystal pointing backlight naked-eye 3D display system described in the first aspect. The control method includes the following steps: S1. The 3D display system is placed in front of the observer. The control device controls the pupil tracking module to capture and track the three-dimensional spatial coordinates of the observer's pupils in real time. The control device receives the three-dimensional spatial coordinates and outputs a timing synchronization control signal. The monochrome backlight flashes RGB light alternately in sequence according to the timing synchronization control signal. The diffusion film layer diffuses and homogenizes the light formed by the monochrome backlight to form a uniform surface light source. S2. The first liquid crystal light valve rapidly flips the uniform light-transmitting area to form a specific light-transmitting area according to the timing synchronization control signal, and modulates the uniform surface light source into a periodic line light source; the lens array refracts and shapes the periodic line light source to obtain a directional light source and projects it according to the three-dimensional spatial coordinates of the observer's pupils. S3. The second liquid crystal light valve sequentially loads the red, green, and blue grayscale channel information of the image according to the timing synchronization control signal. The grayscale image with color is loaded through the pointing beam and enters the human eye, thus completing the naked-eye 3D display process.

[0008] In this application, a first liquid crystal light valve and a second liquid crystal light valve are used to form a dual monochrome liquid crystal architecture. By coordinating high-frequency timing control of the monochrome backlight, the first liquid crystal light valve, and the second liquid crystal light valve, combined with the homogenization of the diffusion film layer and the optical shaping of the lens array, the hardware architecture of this application without color filters can perfectly achieve compatibility and switching between full-resolution, high-brightness 2D and 3D display modes without the need for any mechanical component movement. In addition, the 3D display system also provides 2D display, which can perfectly achieve compatibility and switching between full-resolution, high-brightness 2D and 3D display modes without the need for any mechanical component movement. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the architecture of a field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system provided according to an embodiment of this application; Figure 2 This is a flowchart of the control method for a field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system provided according to an embodiment of this application; Figure 3 This is a timing diagram of the 3D mode operation of a field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system provided according to an embodiment of this application; Figure 4 This is a working optical path diagram of the 3D mode light of the field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system provided according to the embodiments of this application; Figure 5 This is a diagram of the timing refresh control signal for the 3D mode of the field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system provided in the embodiments of this application; Figure 6 This is a timing diagram of the 2D mode operation of a field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system provided according to an embodiment of this application; Figure 7 This is a working optical path diagram of the 2D mode light of the field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system provided according to an embodiment of this application; Figure 8 This is a diagram of the 2D mode refresh control signal for a field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system provided according to an embodiment of this application. Detailed Implementation

[0011] 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 some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0012] like Figure 1This application provides a field-sequential dual-liquid crystal pointing backlight naked-eye 3D display system. The display system includes a pupil tracking module 101, a control device 102, a monochrome backlight 103, a diffusion film layer 104, a first liquid crystal light valve 105, a lens array 106, and a second liquid crystal light valve 107. The pupil tracking module 101 acquires the three-dimensional spatial coordinates of the observer's pupils and transmits them to the control device 102. The control device 102 controls the pupil tracking module 101 to track the three-dimensional coordinates of the observer's pupils, calculates the switching combination of the first liquid crystal light valve 105, and controls the second liquid crystal light valve 107 to sequentially load the stereoscopic image of the RGB channels. The monochrome backlight 103, the diffusion film layer 104, the first liquid crystal light valve 105, the lens array 106, and the second liquid crystal light valve 107 are stacked sequentially along the direction of light propagation.

[0013] Furthermore, the pupil tracking module 101 is disposed at the upper or lower part of the entire display system; the control device 102 is electrically connected to the pupil tracking module 101, the monochrome backlight 103, the first liquid crystal light valve 105 and the second liquid crystal light valve 107 respectively via data lines.

[0014] Furthermore, the monochromatic backlight 103 includes one or more red-green-blue monochromatic light sources; the lens array 106 is one of a Fresnel lens array, a cylindrical lens array, a plano-convex / biconvex lens array, or a compound lens array; the first liquid crystal light valve 105 and the second liquid crystal light valve 107 are both monochromatic liquid crystal light valves without color filters, and the pixels of the liquid crystal light valves can be grayscale adjusted. The lens array 106 is disposed between the first liquid crystal light valve 105 and the second liquid crystal light valve 107, and shapes the light beam passing through the first liquid crystal light valve in 3D mode; the first liquid crystal light valve 105 is a monochromatic liquid crystal light valve with a refresh rate greater than or equal to 120Hz, including ferroelectric liquid crystals, blue phase liquid crystals, etc.; the second liquid crystal light valve 107 is a monochromatic liquid crystal light valve with a refresh rate greater than or equal to 120Hz, including ferroelectric liquid crystals, blue phase liquid crystals, etc.

[0015] like Figure 2 As shown in the figure, this application embodiment also provides a control method for a field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system. The control method is applied to the above-mentioned field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system; the control method includes the following steps: S1. The 3D display system is placed in front of the observer. The control device 102 controls the pupil tracking module 101 to capture and track the three-dimensional spatial coordinates of the observer's pupils in real time. The control device 102 receives the three-dimensional spatial coordinates and outputs a timing synchronization control signal. The monochrome backlight 103 performs high-speed alternating RGB flashing according to the timing synchronization control signal. The diffusion film layer 104 diffuses and homogenizes the light generated by the monochrome backlight 103 to form a uniform surface light source. S2. The first liquid crystal light valve 105 rapidly flips the uniform light-transmitting area to form a specific light-transmitting area according to the timing synchronization control signal, and modulates the uniform surface light source into a periodic line light source; the lens array 106 refracts and shapes the periodic line light source to obtain a directional light source and projects it according to the three-dimensional spatial coordinates of the observer's pupils. S3. The second liquid crystal light valve 107 loads the red, green, and blue grayscale channel information of the image sequentially according to the timing synchronization control signal. The grayscale image with color is loaded through the pointing beam and enters the human eye, thus completing the naked-eye 3D display process.

[0016] Furthermore, the timing of the monochrome backlight 103, the first liquid crystal light valve 105, and the second liquid crystal light valve 107 is strictly aligned.

[0017] Optionally, S1 further includes the following steps, such as... Figure 3 , Figure 4 and Figure 5 As shown: Time T1 is divided into , and At time; in At any given moment, the monochrome backlight 103 receives a red light-up signal; At any given moment, the monochrome backlight 103 receives a green light-on signal; At time T1, the second liquid crystal light valve 107 inputs the grayscale signal of the blue channel, and the monochrome backlight 103 inputs the blue lighting signal; in a specific embodiment, time T1 is the left eye channel time. Time T2 is divided into , and At time; in At any given moment, the monochrome backlight 103 receives a red light-up signal; At any given moment, the monochrome backlight 103 receives a green light-on signal; At time T2, the monochrome backlight 103 receives a blue illumination signal. In one specific embodiment, time T2 is the right eye channel time.

[0018] Optionally, step S2 further includes the following steps: Throughout time T1, the first liquid crystal light valve 105 forms a periodic light-transmitting slit at a specific spatial position according to the control command preset by the control device 102. The light emitted by the monochromatic backlight 103 is homogenized by the diffusion film layer 104 and passes through the periodic light-transmitting slit. After being deflected and shaped by the lens array 106, it forms a directional beam that only covers the left eye area of ​​the observer. At this time, the right eye is in the non-viewing area. Throughout time T2, the first liquid crystal light valve 105 shifts and switches the position of the light-transmitting slit according to the preset control command of the control device 102. Through the deflection and shaping of the lens array 106, a directional light beam is formed that only covers the right eye area of ​​the observer, while the left eye is in the non-viewing area.

[0019] Optionally, step S3 further includes the following steps: Throughout time T1, the control device 102 controls the first liquid crystal light valve 105 to input a left-eye control signal, forming a directional beam of light directed towards the left eye; At a certain moment, the second liquid crystal light valve 107 receives the grayscale signal from the red channel; At a certain moment, the second liquid crystal light valve 107 receives the grayscale signal from the green channel; At that moment, the second liquid crystal light valve 107 inputs the grayscale signal of the blue channel.

[0020] Optionally, step S3 further includes the following steps: At time T2, the control device 102 controls the first liquid crystal light valve 105 to switch and inputs a right eye control signal, forming a directional beam of light directed toward the right eye; time T2 is divided into... , and At that moment, At a certain moment, the second liquid crystal light valve 107 receives the grayscale signal from the red channel; At a certain moment, the second liquid crystal light valve 107 receives the grayscale signal from the green channel; At that moment, the second liquid crystal light valve 107 inputs the grayscale signal of the blue channel.

[0021] Optionally, the display system also includes a 2D display mode, such as... Figure 6 , Figure 7 and Figure 8 As shown, throughout the entire time period, the control device 102 controls the first liquid crystal light valve 105 to continuously input the full-transmittance control signal; the monochrome backlight 103 maintains the same high-frequency field sequence switching mechanism as the 3D mode; the second liquid crystal light valve 107 no longer distinguishes between left and right eye parallax signals, and sequentially inputs the grayscale signals of the red, green, and blue channels corresponding to the 2D planar image to refresh the entire frame according to the emission timing of the monochrome backlight 103.

[0022] In the several embodiments provided in this application, it should be understood that the disclosed methods and apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between devices or units, and may be electrical, mechanical, or other forms.

[0023] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can be physically comprised separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0024] 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 field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system, characterized in that, The display system includes a pupil tracking module (101), a control device (102), a monochrome backlight (103), a diffusion film (104), a first liquid crystal light valve (105), a lens array (106), and a second liquid crystal light valve (107). The pupil tracking module (101) acquires the three-dimensional spatial coordinates of the observer's pupils and transmits them to the control device (102). The control device (102) controls the pupil tracking module (101) to track the three-dimensional coordinates of the observer's pupils, calculates the switching combination of the first liquid crystal light valve (105), and controls the second liquid crystal light valve (107) to sequentially load the stereoscopic image of the RGB channel. The monochrome backlight (103), the diffusion film (104), the first liquid crystal light valve (105), the lens array (106), and the second liquid crystal light valve (107) are stacked sequentially along the direction of light propagation.

2. The field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system according to claim 1, characterized in that, The pupil tracking module (101) is located on the outside or frame of the entire display system; the control device (102) is electrically connected to the pupil tracking module (101), the monochrome backlight (103), the first liquid crystal light valve (105), and the second liquid crystal light valve (107); the monochrome backlight (103) includes one or more red, green, and blue monochrome light sources; the first liquid crystal light valve (105) and the second liquid crystal light valve (107) are both monochrome liquid crystal light valves without color filters, and the pixels of the liquid crystal light valves can be grayscale adjusted.

3. The field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system according to claim 2, characterized in that, The lens array (106) is one of a Fresnel lens array, a cylindrical lens array, a plano-convex / biconvex lens array, or a compound lens array.

4. A control method for a field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system, characterized in that, The control method is applied to the field-sequential dual-liquid crystal pointing backlight naked-eye 3D display system according to any one of claims 1-3; the control method includes the following steps: S1. The 3D display system is placed in front of the observer. The control device (102) controls the pupil tracking module (101) to capture and track the three-dimensional spatial coordinates of the observer's pupils in real time. The control device (102) receives the three-dimensional spatial coordinates and outputs a timing synchronization control signal. The monochrome backlight (103) performs high-speed alternating RGB flashing according to the timing synchronization control signal. The diffusion film layer (104) diffuses and homogenizes the light formed by the monochrome backlight (103) to form a uniform surface light source. S2. The first liquid crystal light valve (105) rapidly flips the uniform light-transmitting area to form a specific light-transmitting area according to the timing synchronization control signal, and modulates the uniform surface light source into a periodic line light source; the lens array (106) refracts and shapes the periodic line light source to obtain a directional light source and projects it according to the three-dimensional spatial coordinates of the observer's pupils. S3. The second liquid crystal light valve (107) loads the red, green and blue grayscale channel information of the image in sequence according to the timing synchronization control signal. The grayscale image with color is loaded through the pointing beam and enters the human eye, finally completing the naked-eye 3D display process.

5. The control method for the field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system according to claim 4, characterized in that, The timing of the monochrome backlight (103), the first liquid crystal light valve (105), and the second liquid crystal light valve (107) is strictly aligned.

6. The control method for the field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system according to claim 4, characterized in that, S1 further includes the following steps: Time T1 is divided into , and At time; in At a certain moment, the monochrome backlight (103) receives a red lighting signal; At a certain moment, the monochrome backlight (103) receives a green lighting signal; At any given time, the second liquid crystal light valve (107) receives a grayscale signal from the blue channel, and the monochrome backlight (103) receives a blue light-up signal. Time T2 is divided into , and At time; in At a certain moment, the monochrome backlight (103) receives a red lighting signal; At a certain moment, the monochrome backlight (103) receives a green lighting signal; At any given time, the monochrome backlight (103) receives a blue light-up signal.

7. The control method for the field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system according to claim 6, characterized in that, S2 also includes the following steps: Throughout time T1, the first liquid crystal light valve (105) forms a periodic light-transmitting slit at a specific spatial position according to the control command preset by the control device (102). The light emitted by the monochromatic backlight (103) is homogenized by the diffusion film layer (104) and passes through the periodic light-transmitting slit. After being deflected and shaped by the lens array (106), it forms a directional beam that only covers the left eye area of ​​the observer. At this time, the right eye is in the non-viewing area. Throughout time T2, the first liquid crystal light valve (105) shifts and switches the position of the light-transmitting slit according to the control command preset by the control device (102), and forms a directional beam that only covers the right eye area of ​​the observer through the deflection and shaping of the lens array (106), while the left eye is in the non-viewing area.

8. The control method for the field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system according to claim 7, characterized in that, S3 also includes the following steps: Throughout time T1, the control device (102) controls the first liquid crystal light valve (105) to input a left-eye control signal, forming a directional beam of light directed toward the left eye; At a certain moment, the second liquid crystal light valve (107) receives a grayscale signal from the red channel; At a certain moment, the second liquid crystal light valve (107) receives a grayscale signal from the green channel; At that moment, the second liquid crystal light valve (107) inputs the grayscale signal of the blue channel.

9. The control method for the field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system according to claim 8, characterized in that, S3 also includes the following steps: At time T2, the control device (102) controls the first liquid crystal light valve (105) to switch and inputs a right eye control signal, forming a directional beam of light directed toward the right eye; time T2 is divided into , and At that moment, At a certain moment, the second liquid crystal light valve (107) receives a grayscale signal from the red channel; At a certain moment, the second liquid crystal light valve (107) receives a grayscale signal from the green channel; At that moment, the second liquid crystal light valve (107) inputs the grayscale signal of the blue channel.

10. The control method for the field-sequence dual-liquid crystal pointing backlight naked-eye 3D display system according to claim 9, characterized in that, The display system is also equipped with a 2D display mode. During the entire time period, the control device (102) controls the first liquid crystal light valve (105) to continuously input the full-transmittance control signal; the monochrome backlight (103) maintains the same high-frequency field sequence switching mechanism as the 3D mode; the second liquid crystal light valve (107) no longer distinguishes between left and right eye parallax signals, and sequentially inputs the grayscale signals of the red, green and blue channels corresponding to the 2D planar image to refresh the entire frame according to the emission timing of the monochrome backlight (103).

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