Active 3D glasses and control method thereof, 3D display system, and dual-purpose glasses

Abstract

The present invention is applicable to the field of three-dimensional display technology, and provides an active 3D glasses and a control method thereof, a 3D display system, and dual-purpose glasses. The active 3D glasses include a control component and left and right lens components; both the left and right lens components include: a polarization converter having a first polarization conversion mode and a second polarization conversion mode, and a polarizer that only allows part of the output light of the polarization converter to pass through; the control component is used to control the two polarization converters to switch between the first polarization conversion mode and the second polarization conversion mode; in the first polarization conversion mode, the two polarization converters keep the polarization state of the light from the screen unchanged; in the second polarization conversion mode, the two polarization converters modulate the polarization state of all the light from the screen in opposite or orthogonal directions. The active 3D glasses can simultaneously receive a half-frame left eye image and a half-frame right eye image in the same timing sequence, and the viewed 3D image has no dark frame and no flicker, and the human eye will not be tired, with full screen resolution.

Description

Technical Field

[0001] The present invention belongs to the field of three-dimensional display technology, and in particular relates to active 3D glasses and a control method thereof, a 3D display system, and dual-purpose glasses. Background Art

[0002] The principle of viewing 3D images is that the left and right eyes of a person receive the left and right eye video images played in frame order respectively, and then the left and right eye video images are synthesized by the brain to produce a 3D effect. When watching a movie, the left and right eyes need to receive the video images through 3D glasses, so that the left eye image can only be received by the left eye, and the right eye image can only be received by the right eye.

[0003] There are many types of 3D display screens. LED, OLED, and LCD screens have gradually attracted attention. There are also many types of 3D glasses used with them. Among them, active shutter 3D glasses and polarized 3D glasses are more widely used.

[0004] The working principle of active 3D glasses is: the left and right eye images are displayed alternately on the LED screen in frame order. Under the control of the frame rate signal, when the left eye image is displayed, the left eye lens is opened and the right eye lens is closed. And vice versa. In terms of structure, each lens of shutter 3D glasses contains a liquid crystal box with a polarizer. The opening and closing of the liquid crystal box is controlled to switch the glasses between black and white. However, at a relatively low frame rate (for example, at 60 frames per second, 30 frames for each left and right eye image), this switching between black and white will produce a flickering feeling, which makes the eyes feel tired.

[0005] Therefore, it is necessary to provide a new 3D playback and viewing mode to solve the problems of flickering and eye fatigue caused by the current active 3D glasses and low resolution, and to improve the user's viewing experience. Summary of the invention

[0006] The technical problem to be solved by the embodiments of the present invention is to provide a 3D display device, which aims to solve the problem that the current active 3D glasses are prone to flickering and cause eye fatigue.

[0007] The embodiment of the present invention is implemented as follows: an active 3D glasses comprises temples and a frame, wherein a left lens assembly and a right lens assembly are installed in the frame;

[0008] The left lens assembly comprises: a left polarization converter having a first polarization conversion mode and a second polarization conversion mode, and a left polarizer that allows only a portion of the output light of the left polarization converter to pass through;

[0009] The right lens assembly includes: a right polarization converter having a first polarization conversion mode and a second polarization conversion mode, and a right polarizer that allows only part of the output light of the right polarization converter to pass through;

[0010] The active 3D glasses further include a control component, which is connected to the left polarization converter and the right polarization converter and is used to control the left polarization converter and the right polarization converter to switch between the first polarization conversion mode and the second polarization conversion mode;

[0011] Furthermore, in the first polarization conversion mode, the left polarization converter and the right polarization converter keep the polarization state of the light from the screen unchanged; in the second polarization conversion mode, the left polarization converter and the right polarization converter modulate the polarization state of all the light from the screen in opposite or orthogonal directions; wherein the light from the screen always includes two different polarization states.

[0012] Furthermore, the control component comprises:

[0013] A synchronization signal receiving module, used for receiving timing information of the played stereoscopic image;

[0014] A control module is connected to the synchronization signal receiving module and is used to control the left polarization converter and the right polarization converter to be in matching polarization conversion modes according to the timing information.

[0015] Furthermore, the polarization states of light allowed to pass through the left polarizer and the right polarizer are consistent; when the control component controls the left polarization converter to be in the first polarization conversion mode, it simultaneously controls the right polarization converter to be in the second polarization conversion mode; and when the control component controls the left polarization converter to be in the second polarization conversion mode, it simultaneously controls the right polarization converter to be in the first polarization conversion mode.

[0016] Furthermore, the polarization state of the light allowed to pass through by the left polarizer is opposite to or orthogonal to the polarization state of the light allowed to pass through by the right polarizer; when the control component controls the left polarization converter to be in the first polarization conversion mode, the right polarization converter is also synchronously controlled to be in the first polarization conversion mode; and when the control component controls the left polarization converter to be in the second polarization conversion mode, the right polarization converter is also synchronously controlled to be in the second polarization conversion mode.

[0017] Furthermore, the control component controls the polarization conversion modes of the left polarization converter and the right polarization converter to switch once every half image frame.

[0018] Furthermore, the left polarization converter and the right polarization converter are selected from the following modes of liquid crystal cells: TN mode liquid crystal cell, vertical alignment mode liquid crystal cell, ECB mode liquid crystal cell, OCB mode liquid crystal cell, IPS mode liquid crystal cell, FLC mode liquid crystal cell; the left polarizer and the right polarizer are linear polarizers or circular polarizers.

[0019] The embodiment of the present invention further provides a method for controlling the active 3D glasses as described above, the method comprising the following steps:

[0020] In the upper half image frame, when the left polarization converter is controlled to be in the first polarization conversion mode, the right polarization converter is simultaneously controlled to be in the second polarization conversion mode;

[0021] In the lower image frame, when the left polarization converter is controlled to be in the second polarization conversion mode, the right polarization converter is simultaneously controlled to be in the first polarization conversion mode.

[0022] The embodiment of the present invention further provides another method for controlling the active 3D glasses as described above, the method comprising the following steps:

[0023] In the upper half image frame, controlling the left polarization converter and the right polarization converter to be in the first polarization conversion mode;

[0024] In the lower image frame, the left polarization converter and the right polarization converter are both controlled to be in the second polarization conversion mode.

[0025] The embodiment of the present invention further provides a 3D display system, including:

[0026] A video source device, used for outputting video image frames to be displayed, each frame of image including a half-frame left-eye image and a half-frame right-eye image;

[0027] A timing synchronization signal transmitter, used to send out timing information of the played 3D images;

[0028] A 3D screen, comprising a first pixel area and a second pixel area, wherein the first pixel area comprises a plurality of first pixel points, and the second pixel area comprises a plurality of second pixel points; wherein the first pixel points and the second pixel points are arranged alternately in a horizontal direction and / or a vertical direction; according to the timing information, the first pixel area and the second pixel area both alternately display a half-frame left-eye image and a half-frame right-eye image, and within the same timing, one of the first pixel area and the second pixel area displays the half-frame left-eye image, and the other displays the half-frame right-eye image; and within the same timing, the polarization state of light displayed by each first pixel point is orthogonal to or opposite to the polarization state of light displayed by each second pixel point;

[0029] The active 3D glasses as described above are used to control the left polarization converter and the right polarization converter to be in matching polarization conversion modes according to the timing information.

[0030] The embodiment of the present invention also provides a pair of dual-purpose glasses with the functions of 3D glasses and sunglasses, comprising temples and a frame, wherein a left lens assembly and a right lens assembly are installed in the frame;

[0031] The left lens assembly comprises: a left polarization converter having a first polarization conversion mode and a second polarization conversion mode, and a left polarizer that allows only a portion of the output light of the left polarization converter to pass through;

[0032] The right lens assembly includes: a right polarization converter having a first polarization conversion mode and a second polarization conversion mode, and a right polarizer that allows only a portion of the output light of the right polarization converter to pass through; the active 3D glasses also include a control component, which is connected to the left polarization converter and the right polarization converter and is used to control the left polarization converter and the right polarization converter to switch between the first polarization conversion mode and the second polarization conversion mode;

[0033] Furthermore, in the first polarization conversion mode, the left polarization converter and the right polarization converter keep the polarization state of the light from the screen unchanged; in the second polarization conversion mode, the left polarization converter and the right polarization converter modulate the polarization state of all the light from the screen in opposite or orthogonal directions; wherein the light from the screen includes two different polarization states at all times;

[0034] The structures of the left polarizer and the right polarizer meet one of the following conditions:

[0035] Case 1: the left polarizer and the right polarizer are horizontal linear polarizers, and the left polarization converter and the right polarization converter are TN liquid crystal cells or are in the second polarization conversion mode at zero voltage;

[0036] Case 2: the left polarizer and the right polarizer are vertical linear polarizers, and the left polarization converter and the right polarization converter are VA liquid crystal cells or are in the first polarization conversion mode at zero voltage;

[0037] Situation 3: the left polarizer is a horizontal linear polarizer and the left polarization converter is in the second polarization conversion mode, the right polarizer is a vertical linear polarizer and the right polarization converter is in the first polarization conversion mode;

[0038] Situation 4: the right polarizer is a horizontal linear polarizer and the right polarization converter is in the second polarization conversion mode, the left polarizer is a vertical linear polarizer and the left polarization converter is in the first polarization conversion mode;

[0039] Case 5: The left polarizer and the right polarizer are both circular polarizers comprising a vertical linear polarizer and a quarter-wavelength retardation film; the structural order of the left lens and the right lens can be flipped, and when the left polarizer and the right polarizer are flipped to be located outside, their respective vertical polarizers are located at the outermost side.

[0040] The active 3D glasses provided by the embodiment of the present invention can simultaneously receive a half-frame left-eye image and a half-frame right-eye image in the same timing, so that the left and right eyes of the audience can always see the image, avoiding the situation in the prior art that only one eye can receive the image at each moment. Therefore, the 3D image viewed by the eyes has no dark frames, no flickering, and the human eye will not be tired. In addition, although each eye only sees a half-frame left-eye image and a half-frame right-eye image at the same time, the resolution is temporarily low, but when the next frame of the image is displayed, the first pixel area and the second pixel area will be converted to display the other half of the image, and the resolution is replenished. At the current refresh rate of 3D video images, the human eye can fully see stable left and right separated images, and the left and right images intuitively perceived by the human eye are full-screen resolution. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figures 1A to 1D It is a schematic diagram of the arrangement of pixels of the 3D screen provided by the present invention;

[0042] Figure 2 is a structural diagram of a 3D display system provided by a first embodiment of the present invention;

[0043] Figure 3 is a structural diagram of active 3D glasses provided by a second embodiment of the present invention;

[0044] Figure 4 is a structural diagram of a control component provided by a second embodiment of the present invention;

[0045] Figure 5 is a schematic diagram of timing synchronization between a 3D screen and active 3D glasses provided by a second embodiment of the present invention;

[0046] Fig. 6A is a schematic diagram of the conversion of the polarization state of the polarized light of the left lens assembly and the right lens assembly of the upper half image frame when the control mode 1 is adopted provided by the second embodiment of the present invention;

[0047] Figure 6Bis a schematic diagram of the conversion of the polarization state of the polarized light of the left lens assembly and the right lens assembly in the lower half image frame when the control mode 1 is adopted provided by the second embodiment of the present invention;

[0048] Fig. 7A It is a schematic diagram of the conversion of the polarization state of the polarized light of the left lens assembly and the right lens assembly of the upper half image frame when the control mode 2 is adopted provided by the second embodiment of the present invention;

[0049] Figure 7B It is a schematic diagram of the conversion of the polarization state of the polarized light of the left lens assembly and the right lens assembly in the lower half image frame when the control method 2 is adopted provided by the second embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0051] The screen adapted to the active 3D glasses provided in the embodiment of the present invention can be implemented by LED display or OLED display screen. The pixels of the screen are divided into two groups. When one group displays the left eye image, the other group displays the right eye image, and the screen switches once every half image frame. For example, in the upper half image frame, the first group of pixel areas A displays half a frame of the left eye image, and the second group of pixel areas B displays half a frame of the right eye image. In the lower half image frame, the first group of pixel areas A switches to display another half frame of the right eye image, and the second group of pixel areas B displays another half frame of the left eye image.

[0052] That is, in two adjacent frame sequences, each group of pixel areas alternately displays half a frame of left eye image and half a frame of right eye image. Moreover, in the same sequence, two groups of pixel areas respectively display half a frame of left eye image and half a frame of right eye image with orthogonal or opposite polarization states, thereby ensuring that the active 3D glasses can simultaneously receive left eye and right eye images in the same sequence.

[0053] The design of the first pixel area G1 and the second pixel area G2 on the screen can be in various forms. Specifically, the first pixel area G1 includes a plurality of first pixel points, and the second pixel area G2 includes a plurality of second pixel points; wherein the arrangement of the first pixel points and the second pixel points is as follows:

[0054] The first is to form a staggered arrangement in the horizontal direction. Figure 1A As shown, the 1st, 3rd, 5th odd-numbered columns all belong to the first pixel area G1, the 2nd, 4th, 6th even-numbered columns all belong to the second pixel area G2, and A and B are alternately arranged in each row.

[0055] The second type is to form a staggered arrangement in the vertical direction. Figure 1BAs shown, the 1st, 3rd, 5th and other odd-numbered rows all belong to the first pixel area G1, the 2nd, 4th, 6th and other even-numbered rows all belong to the second pixel area G2, and A and B are alternately arranged in each column.

[0056] The third type is to form a staggered arrangement both horizontally and vertically. Figure 1C and Figure 1D As shown, no matter in each row or column, A and B are interlaced or B and A are interlaced to form a chessboard structure.

[0057] Based on the above principles, Figure 2 The 3D display system provided by the first embodiment of the present invention is shown, which specifically includes a video source device 1, a 3D screen 2 and active 3D glasses 3, and also includes a timing synchronization signal transmitter for sending timing information of the played stereoscopic image. The timing synchronization signal transmitter can be built into the video source device 1 or independent of the video source device 1.

[0058] Wherein, the video source device 1 is used to output the video image frames to be displayed, and each frame image includes a half-frame left eye image and a half-frame right eye image. The half-frame left eye image in each odd-numbered frame image and the half-frame left eye image in the next frame image constitute a complete left eye image. For example, the half-frame left eye image in the first frame and the half-frame left eye image in the second frame can constitute a complete left eye image, and the half-frame left eye image in the third frame and the half-frame left eye image in the fourth frame can constitute a complete left eye image. Similarly, the half-frame right eye image in each odd-numbered frame image and the half-frame right eye image in the next frame image also constitute a complete right eye image. Therefore, each odd-numbered frame is equivalent to the upper half of the image frame, and each even-numbered frame is equivalent to the lower half of the image frame.

[0059] The 3D screen 2 is connected to the video source device 1, and is also connected to the timing synchronization signal transmitter in a wired or wireless manner. The 3D display device 2 has a first pixel area G1 and a second pixel area G2. The first pixel area G1 includes a plurality of first pixel points, and the second pixel area G2 includes a plurality of second pixel points, such as Figure 1A-Figure 1DAs shown, the first pixel point and the second pixel point are arranged alternately in the horizontal direction and / or the vertical direction. According to the timing information, the first pixel area G1 and the second pixel area G2 both alternately display a half-frame left eye image and a half-frame right eye image, and the first pixel area G1 displays a half-frame left eye image and a half-frame right eye image in two adjacent timings; the second pixel area G2 displays a half-frame right eye image and a half-frame left eye image in two adjacent timings. For example, at the Nth timing (N is a natural number greater than or equal to 1, corresponding to the upper half image frame), the first pixel area G1 first displays a half-frame left eye image, and at the N+1th timing (corresponding to the lower half image frame), the first pixel area G1 then displays a half-frame right eye image. On the contrary, at the Nth timing, the second pixel area G2 first displays a half-frame right eye image, and at the N+1th timing, the second pixel area G2 then displays a half-frame left eye image.

[0060] It can be seen that since the first pixel area G1 and the second pixel area G2 only occupy half of the entire display screen, in each frame displayed on the display screen, the left eye image and the right eye image each occupy only half of the resolution. However, although each eye only sees half a frame of the left eye image and half a frame of the right eye image at the same time, the resolution is temporarily low, but when the next frame of the image is displayed, the first pixel area G1 and the second pixel area G2 will be used in reverse to make up the resolution. At the current refresh rate of 3D video images, the human eye can fully see stable left and right separated images, and the left and right images intuitively perceived by the human eye are full-screen resolution.

[0061] In the same time sequence, the polarization state of the half-frame right eye image is orthogonal or opposite to the polarization state of the half-frame left eye image. In any time sequence, although the half-frame left eye image and the half-frame right eye image are displayed alternately in two pixel areas, the half-frame left eye image and the half-frame right eye image in half an image frame need to always maintain orthogonal or opposite polarization states. In an embodiment of the present invention, "orthogonal" refers to linear polarized light with two polarization angles perpendicular, and "opposite" refers to left-handed circularly polarized light and right-handed circularly polarized light, also called counterclockwise circularly polarized light and clockwise circularly polarized light. Specifically as shown in Table 1 below (wherein it is assumed that the polarization state of the light emitted by the first pixel area G1 is P1, and the polarization state of the light emitted by the second pixel area G2 is P2, L represents the left eye image, and R represents the right eye image):

[0062]

[0063] Table 1

[0064] The active 3D glasses 3 include a left lens assembly and a right lens assembly, the left lens assembly only receives a half-frame left eye image, the right lens assembly only receives a half-frame right eye image, the left lens assembly includes a left polarization converter, the right lens assembly includes a right polarization converter, and the left polarization converter and the right polarization converter have two polarization conversion modes. The active 3D glasses 3 control the left polarization converter and the right polarization converter to be in matching polarization conversion modes according to the timing information.

[0065] According to the above description, the half-frame left-eye image received by the left lens assembly can come from both the first pixel area G1 and the second pixel area G2, and the half-frame right-eye image received by the right lens assembly can also come from both the first pixel area G1 and the second pixel area G2.

[0066] When the display screen displays the upper half of the image frame, the left lens assembly allows the light emitted by the first pixel area G1 to pass through and blocks the light emitted by the second pixel area G2. At the same time, the right lens assembly allows the light emitted by the second pixel area G2 to pass through and blocks the light emitted by the first pixel area G1. When the display screen displays the lower half of the image frame, the left lens assembly allows the light emitted by the second pixel area G2 to pass through and blocks the light emitted by the first pixel area G1. At the same time, the right lens assembly allows the light emitted by the first pixel area G1 to pass through and blocks the light emitted by the second pixel area G2. This cycle is analogous and will not be repeated.

[0067] It can be understood from the above discussion that the polarization state of the light emitted by the 3D screen 2 and the polarization state of the active 3D glasses 3 need to be adapted. Specifically, it is necessary to ensure that the polarization state of the light of each half-frame left-eye image is always consistent with the polarization state of the left lens component of the active 3D glasses 3, and it is also necessary to ensure that the polarization state of the light of each half-frame right-eye image is always consistent with the polarization state of the right lens component of the active 3D glasses 3. In specific implementation, the polarization state of the first pixel area G1 and the second pixel area G2 can be kept unchanged, and only the polarization state of the left and right lenses can be changed, or the polarization state of the left and right lenses can be kept unchanged, while the polarization state of the first pixel area G1 and the second pixel area G2 can be changed.

[0068] The second embodiment of the present invention provides an active 3D glasses, which can be applied to the first embodiment. Figure 3The active 3D glasses include temples 31 and a frame, in which a left lens assembly and a right lens assembly are installed. The left lens assembly includes a left polarization converter 321 and a left polarizer 322, the left polarization converter 321 has a first polarization conversion mode and a second polarization conversion mode, and the left polarizer 322 allows only a portion of the output light of the left polarization converter 321 to pass through. The right lens assembly includes a right polarization converter 323 and a right polarizer 324, the right polarization converter 323 has a first polarization conversion mode and a second polarization conversion mode, and the right polarizer 323 allows only a portion of the output light of the right polarization converter 324 to pass through.

[0069] The active 3D glasses further include a control component 33 connected to the left polarization converter 321 and the right polarization converter 323 for controlling the left polarization converter 321 and the right polarization converter 323 to switch between a first polarization conversion mode and a second polarization conversion mode.

[0070] In the first polarization conversion mode, the left polarization converter 321 and the right polarization converter 323 keep the polarization state of the light from the screen unchanged. In the second polarization conversion mode, the left polarization converter 321 and the right polarization converter 323 modulate the polarization state of all the light from the screen to their respective opposite or orthogonal directions. Specifically, when the light from the screen is linearly polarized light, the left polarization converter 321 and the right polarization converter 323 convert the linearly polarized light into another linearly polarized light with an orthogonal polarization direction in the second polarization conversion mode. For example, when the light from the screen is vertically polarized light, the left polarization converter 321 and the right polarization converter 323 convert the vertically polarized light into horizontally polarized light in the second polarization conversion mode. Conversely, when the light from the screen is horizontally polarized light, the left polarization converter 321 and the right polarization converter 323 convert the horizontally polarized light into vertically polarized light in the second polarization conversion mode. When the light from the screen is left-handed circularly polarized light, the left polarization converter 321 and the right polarization converter 323 convert the left-handed circularly polarized light into right-handed circularly polarized light in the second polarization conversion mode. Conversely, when the light from the screen is right-handed circularly polarized light, the left polarization converter 321 and the right polarization converter 323 convert the right-handed circularly polarized light into left-handed circularly polarized light in the second polarization conversion mode. The details are shown in Table 2:

[0071] Input polarization state P1 P2 The first polarization conversion mode S1 (maintaining polarization state) P1 P2 Second polarization conversion mode S2 (converting polarization state) P2 P1

[0072] Table 2

[0073] As described in the first embodiment, the light from the screen includes two different polarization states at all times, that is, the left polarization converter 321 and the right polarization converter 323 convert both polarized lights in the second polarization conversion mode, and convert them into polarized lights different from their original polarization states. In addition, the control component 33 controls the polarization conversion mode switching of the left polarization converter 321 and the right polarization converter 323 once every half image frame.

[0074] Furthermore, if Figure 4 As shown, the control component 33 includes: a synchronization signal receiving module 331 and a control module 332. The synchronization signal receiving module 331 is used to receive the timing information of the played stereoscopic image; the control module 332 is connected to the synchronization signal receiving module 331, and is used to control the left polarization converter 321 and the right polarization converter 323 to be in a matching polarization conversion mode according to the timing information.

[0075] When the video source device sends video data to the screen, the timing synchronization signal transmitter will simultaneously send the playback timing information of the image to the screen and the synchronization signal receiving module 331, so that the control module 332 can control the operation of the left polarization converter 321 and the right polarization converter 323 according to the timing information, and finally the timing of the screen and the glasses can be synchronized. Figure 5 shown.

[0076] The left polarization converter 321 and the right polarization converter 323 are selected from the following liquid crystal cells: TN (Twisted Nematic) liquid crystal cell, vertical alignment liquid crystal cell, ECB (Electrically Controlled Birefringence) liquid crystal cell, OCB (Optical Compensated Birefringence) liquid crystal cell, IPS (In-Plane Switching) liquid crystal cell, FLC (Ferroelectric Liquid Crystal) liquid crystal cell. The left polarizer 322 and the right polarizer 324 are linear polarizers or circular polarizers.

[0077] As described above, the control component 33 is used to control the working state of the left polarization converter 321 and the right polarization converter 323. The specific control principle is not limited as long as the above control effect can be achieved. This embodiment now provides two control methods, as follows (it should be understood that other control methods can also be used according to actual conditions during specific implementation):

[0078] Mode 1: At this time, the polarization states of the light allowed to pass through by the left polarizer 322 and the right polarizer 324 are consistent.

[0079] When the control component 33 controls the left polarization converter 321 to be in the first polarization conversion mode, it also controls the right polarization converter 323 to be in the second polarization conversion mode; and when the control component 33 controls the left polarization converter 321 to be in the second polarization conversion mode, it also controls the right polarization converter 323 to be in the first polarization conversion mode. For the conversion process of the polarization state of polarized light in this control method, please refer to Fig. 6A and Figure 6B .

[0080] from Fig. 6A It can be seen that in the upper half image frame, the left polarization converter 321 and the right polarization converter 323 simultaneously receive the light of the polarization state P1 (left eye image) emitted by the first pixel area G1 and the light of the polarization state P2 (right eye image) emitted by the second pixel area G2, but since the left polarization converter 321 operates in the first polarization conversion mode S1, P1 and P2 remain unchanged, but the left polarizer 322 only allows P1 to pass. Since the right polarization converter 323 operates in the second polarization conversion mode S2, P1 and P2 are converted to P2 and P1 respectively, but the right polarizer 324 only allows the converted P1 to pass.

[0081] from Figure 6B It can be seen that in the lower half image frame, the left polarization converter 321 and the right polarization converter 323 simultaneously receive the light of the P2 polarization state emitted by the second pixel area G2 (left eye image) and the light of the P1 polarization state emitted by the first pixel area G1 (right eye image), but because the left polarization converter 321 works in the second polarization conversion mode S2, P1 and P2 are converted to P2 and P1 respectively, but the left polarizer 322 only allows the converted P1 to pass. Because the right polarization converter 323 works in the first polarization conversion mode S1, P1 and P2 remain unchanged, but the right polarizer 324 only allows P1 to pass.

[0082] The polarization states of the light seen by the audience's eyes in the upper and lower half image frames are shown in Table 3:

[0083]

[0084] Table 3

[0085] Mode 2: At this time, the polarization state of the light allowed to pass through the left polarizer 322 is opposite or orthogonal to the polarization state of the light allowed to pass through the right polarizer 324. The definition of "orthogonal or opposite" is as described above and will not be repeated here.

[0086] When the control component 33 controls the left polarization converter 321 to be in the first polarization conversion mode, it synchronously controls the right polarization converter 323 to be in the first polarization conversion mode; and when the control component 33 controls the left polarization converter 321 to be in the second polarization conversion mode, it synchronously controls the right polarization converter 324 to be in the second polarization conversion mode.

[0087] from Fig. 7A It can be seen that in the upper half image frame, the left polarization converter 321 and the right polarization converter 323 simultaneously receive the light of the P1 polarization state emitted by the first pixel area G1 (left eye image) and the light of the P2 polarization state emitted by the second pixel area G2 (right eye image). Since the left polarization converter 321 and the right polarization converter 323 both operate in the first polarization conversion mode S1, their respective P1 and P2 remain unchanged, but the left polarizer 322 only allows P1 to pass, and the right polarizer 324 only allows P2 to pass.

[0088] from Figure 7B It can be seen that in the lower half image frame, the left polarization converter 321 and the right polarization converter 323 simultaneously receive the light of the P2 polarization state emitted by the second pixel area G2 (left eye image) and the light of the P1 polarization state emitted by the first pixel area G1 (right eye image). Since the left polarization converter 321 and the right polarization converter 323 both operate in the second polarization conversion mode S2, their respective P1 and P2 are converted to P2 and P1 respectively, but the left polarizer 322 only allows the converted P1 to pass through, and the right polarizer 324 only allows the converted P2 to pass through.

[0089] The polarization states of the light seen by the audience's eyes in the upper and lower half image frames are shown in Table 4:

[0090]

[0091] Table 4

[0092] Further, assuming that the light of polarization state P1 emitted by the first pixel region G1 is horizontal linear polarization H, and the light of polarization state P2 emitted by the second pixel region G2 is vertical linear polarization V, the left polarization converter 321 and the right polarization converter 323 can be implemented by the following liquid crystal devices:

[0093] 1. 90° twisted nematic (TN) liquid crystal box, when the voltage value is 0 volts, it corresponds to the S2 state; when the voltage is large enough, it corresponds to the S1 state.

[0094] 2. Vertical alignment (VA) liquid crystal box, when the voltage value is 0 volts, it corresponds to the S1 state; when the voltage is large enough, it corresponds to the S2 state.

[0095] 3. OCB liquid crystal box, when the voltage value is a certain low voltage value, it corresponds to the S2 state; when the voltage is large enough, it corresponds to the S1 state.

[0096] In the above embodiments, when a high voltage is applied to the TN liquid crystal cell and the OCB liquid crystal cell, the liquid crystal molecules are pulled vertically by the electric field and have no effect on the polarization state of the incident light, which is the S1 state; when the voltage is zero or low, the TN liquid crystal cell acts as a 90° polarization rotator, and the OCB liquid crystal cell acts as a half-wave plate, resulting in P1 being converted to P2, and P2 being converted to P1, which is the S2 state. For the vertical alignment (VA) liquid crystal cell, the situation is just the opposite. When no voltage is applied, it is in the vertical state (S1), and when voltage is applied, it acts as a half-wave plate (S2). The corresponding relationship between the applied voltage and the polarization conversion mode of the above three liquid crystal devices is shown in Table 5 below, where H: represents high voltage and L represents low (or zero) voltage:

[0097] TN VA OCB S1 state H L H S2 state L H L

[0098] Table 5

[0099] Other liquid crystal modes such as ECB, IPS, and FLC can also be used in a similar principle. At this time, the left polarizer 322 and the right polarizer 324 are matched linear polarizers.

[0100] Furthermore, assuming that the P1 state is left-handed circular polarization LC and the P2 state is right-handed circular polarization RC, the specific implementation methods of the left polarization converter 321 and the right polarization converter 323 are the same as those when the linear polarization is input, except that the TN liquid crystal cell is not applicable at this time, and other liquid crystal cells acting between the vertical and half-wave plates are applicable. At this time, the vertical state is S1, and the left and right circular polarization states remain unchanged. In the half-wave state, the left-handed circular polarization LC will be converted into the right-handed circular polarization RC, and at the same time, the right-handed circular polarization RC will be converted into the left-handed circular polarization LC, which is the S2 state.

[0101] At this time, the left polarizer 322 and the right polarizer 324 are matched circular polarizers. The function of the circular polarizer is to allow only left circular or right circular polarized light to pass through, and the usage is the same as the linear polarizer during linear polarization input. The structure of the circular polarizer is generally realized by attaching a quarter wave plate to the linear polarizer.

[0102] The third embodiment of the present invention further provides a control method for active 3D glasses, the active 3D glasses are the 3D glasses described in the second embodiment, and the method comprises the following steps:

[0103] Step S301, in the upper half image frame, when the left polarization converter is controlled to be in the first polarization conversion mode, the right polarization converter is controlled to be in the second polarization conversion mode.

[0104] Step S302 : in the lower half image frame, while controlling the left polarization converter to be in the second polarization conversion mode, the right polarization converter is simultaneously controlled to be in the first polarization conversion mode.

[0105] The first polarization conversion mode and the second polarization conversion mode are as defined in the second embodiment and are not described in detail herein.

[0106] The fourth embodiment of the present invention further provides another control method for active 3D glasses, the active 3D glasses are the 3D glasses described in the second embodiment, and the method comprises the following steps:

[0107] Step S401 : In the upper image frame, the left polarization converter and the right polarization converter are controlled to be in a first polarization conversion mode.

[0108] Step S402: In the lower half image frame, the left polarization converter and the right polarization converter are controlled to be in the second polarization conversion mode.

[0109] The fifth embodiment of the present invention also provides a pair of dual-purpose glasses, which have the functions of 3D glasses and sunglasses, and include temples, a frame, and a control assembly, wherein a left lens assembly and a right lens assembly are installed in the frame. The left lens assembly includes: a left polarization converter having a first polarization conversion mode and a second polarization conversion mode, and a left polarizer that only allows part of the output light of the left polarization converter to pass through.

[0110] The right lens assembly includes: a right polarization converter having a first polarization conversion mode and a second polarization conversion mode, and a right polarizer that allows only a portion of the output light of the right polarization converter to pass.

[0111] The active 3D glasses further include a control component, which is connected to the left polarization converter and the right polarization converter and is used to control the left polarization converter and the right polarization converter to switch between the first polarization conversion mode and the second polarization conversion mode.

[0112] Furthermore, in the first polarization conversion mode, the left polarization converter and the right polarization converter keep the polarization state of the light from the screen unchanged; in the second polarization conversion mode, the left polarization converter and the right polarization converter modulate the polarization state of all the light from the screen in opposite or orthogonal directions; wherein the light from the screen always includes two different polarization states.

[0113] The working principles of the control assembly, the left polarization converter and the right polarization converter are as described in the second embodiment and will not be described in detail. Since the function of sunglasses is to filter out horizontal polarized light while retaining vertical polarized light, active 3D glasses with polarizers can be used as sunglasses. The specific conditions are:

[0114] Scenario 1: The left polarizer and the right polarizer are horizontal linear polarizers, and the left polarization converter and the right polarization converter are TN liquid crystal cells or are in the second polarization conversion mode at zero voltage.

[0115] Scenario 2 :The left polarizer and the right polarizer are vertical linear polarizers, and the left polarization converter and the right polarization converter are VA liquid crystal cells or are in the first polarization conversion mode at zero voltage.

[0116] Scenario 3: The left polarizer is a horizontal linear polarizer and the left polarization converter is in the second polarization conversion mode, and the right polarizer is a vertical linear polarizer and the right polarization converter is in the first polarization conversion mode.

[0117] Scenario 4 : The right polarizer is a horizontal linear polarizer and the right polarization converter is in the second polarization conversion mode, and the left polarizer is a vertical linear polarizer and the left polarization converter is in the first polarization conversion mode.

[0118] Scenario 5 : The left polarizer and the right polarizer are circular polarizers, and both the left polarizer and the right polarizer are circular polarizers containing a vertical linear polarizer and a quarter-wavelength retardation film; the structural order of the left lens and the right lens can be flipped, and when the left polarizer and the right polarizer are flipped to be located outside, their respective vertical polarizers are located at the outermost side.

[0119] In situation 5, since the circular polarizer cannot filter the incident light with linear polarization, the linear polarizer originally placed at the end can only be turned over to face outwards to achieve the effect of sunglasses. Therefore, the structural order of the left lens and the structural order of the right lens are required to be reversed. At the same time, the linear polarizer facing outwards is required to be a vertical polarizer.

[0120] The above description is about how to use 3D glasses as sunglasses when no power is required. If the 3D glasses are used as sunglasses when they are electrically driven (obviously not the preferred method), the principle is the same. In this case, the "zero voltage" in the above situations 1, 2, and 3 can be changed to "voltage applied".

[0121] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An active 3D glasses, comprising temples and a frame, characterized in that: The active 3D glasses are used to receive light from a screen, and the light from the screen always includes two different polarization states; a left lens assembly and a right lens assembly are installed in the frame; The left lens assembly comprises: a left polarization converter having a first polarization conversion mode and a second polarization conversion mode, and a left polarizer that allows only one of the two types of light output by the left polarization converter to pass through; wherein the left polarization converter allows the two different polarization states of light from the screen to pass through in their original polarization states or in their converted polarization states at the same time; The right lens assembly comprises: a right polarization converter having a first polarization conversion mode and a second polarization conversion mode, and a right polarizer that allows only one of the two types of light output by the right polarization converter to pass through; wherein the right polarization converter allows the two different polarization states of light from the screen to pass through in their original polarization states or in their converted polarization states at the same time; The active 3D glasses further include a control component, which is connected to the left polarization converter and the right polarization converter and is used to control the left polarization converter and the right polarization converter to switch between the first polarization conversion mode and the second polarization conversion mode; The left polarization converter and the right polarization converter need to simultaneously receive two lights of different polarization states from the screen. In the first polarization conversion mode, the left polarization converter and the right polarization converter keep the polarization states of the two lights unchanged; in the second polarization conversion mode, the left polarization converter and the right polarization converter modulate the polarization states of the two lights in opposite or orthogonal directions.

2. The active 3D glasses according to claim 1, wherein: The control component comprises: A synchronization signal receiving module, used for receiving timing information of the played stereoscopic image; A control module is connected to the synchronization signal receiving module and is used to control the left polarization converter and the right polarization converter to be in matching polarization conversion modes according to the timing information.

3. The active 3D glasses according to claim 1, wherein: The polarization states of the light allowed to pass through by the left polarizer and the right polarizer are consistent; When the control component controls the left polarization converter to be in the first polarization conversion mode, it simultaneously controls the right polarization converter to be in the second polarization conversion mode; and when the control component controls the left polarization converter to be in the second polarization conversion mode, it simultaneously controls the right polarization converter to be in the first polarization conversion mode.

4. The active 3D glasses according to claim 1, wherein: The polarization state of the light allowed to pass through the left polarizer is opposite to or orthogonal to the polarization state of the light allowed to pass through the right polarizer; When the control component controls the left polarization converter to be in the first polarization conversion mode, it synchronously controls the right polarization converter to be in the first polarization conversion mode; and when the control component controls the left polarization converter to be in the second polarization conversion mode, it synchronously controls the right polarization converter to be in the second polarization conversion mode.

5. The active 3D glasses according to any one of claims 1 to 4, characterized in that: The control component controls the polarization conversion modes of the left polarization converter and the right polarization converter to switch once every half image frame.

6. The active 3D glasses according to any one of claims 1 to 4, characterized in that: The left polarization converter and the right polarization converter are selected from the following liquid crystal cells: a TN mode liquid crystal cell, a vertical alignment mode liquid crystal cell, an ECB mode liquid crystal cell, an OCB mode liquid crystal cell, an IPS mode liquid crystal cell, and an FLC mode liquid crystal cell; The left polarizer and the right polarizer are linear polarizers or circular polarizers.

7. A method for controlling the active 3D glasses according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: In the upper half image frame, when the left polarization converter is controlled to be in the first polarization conversion mode, the right polarization converter is simultaneously controlled to be in the second polarization conversion mode; In the lower image frame, when the left polarization converter is controlled to be in the second polarization conversion mode, the right polarization converter is simultaneously controlled to be in the first polarization conversion mode.

8. A method for controlling the active 3D glasses according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: In the upper half image frame, controlling the left polarization converter and the right polarization converter to be in the first polarization conversion mode; In the lower image frame, the left polarization converter and the right polarization converter are both controlled to be in the second polarization conversion mode.

9. A 3D display system, characterized in that: include: A video source device, used for outputting video image frames to be displayed, each frame of image including a half-frame left-eye image and a half-frame right-eye image; A timing synchronization signal transmitter, used to send out timing information of the played 3D images; A 3D screen, comprising a first pixel area and a second pixel area, wherein the first pixel area comprises a plurality of first pixel points, and the second pixel area comprises a plurality of second pixel points; wherein the first pixel points and the second pixel points are arranged alternately in a horizontal direction and / or a vertical direction; according to the timing information, the first pixel area and the second pixel area both alternately display a half-frame left-eye image and a half-frame right-eye image, and within the same timing, one of the first pixel area and the second pixel area displays the half-frame left-eye image, and the other displays the half-frame right-eye image; and within the same timing, the polarization state of light displayed by each first pixel point is orthogonal to or opposite to the polarization state of light displayed by each second pixel point; The active 3D glasses according to any one of claims 1 to 6 are used to control the left polarization converter and the right polarization converter to be in matching polarization conversion modes according to the timing information.

10. A pair of dual-purpose glasses with the functions of 3D glasses and sunglasses, comprising temples and a frame, characterized in that: The dual-purpose glasses can receive light from a screen, and the light from the screen always includes two different polarization states; a left lens assembly and a right lens assembly are installed in the frame; The left lens assembly comprises: a left polarization converter having a first polarization conversion mode and a second polarization conversion mode, and a left polarizer that allows only one of the two types of light output by the left polarization converter to pass through; wherein the left polarization converter allows the two different polarization states of light from the screen to pass through in their original polarization states or in their converted polarization states at the same time; The right lens assembly comprises: a right polarization converter having a first polarization conversion mode and a second polarization conversion mode, and a right polarizer that allows only one of the two types of light output by the right polarization converter to pass through; wherein the right polarization converter allows the two different polarization states of light from the screen to pass through in their original polarization states or in their converted polarization states at the same time; The dual-purpose glasses further include a control component, which is connected to the left polarization converter and the right polarization converter and is used to control the left polarization converter and the right polarization converter to switch between the first polarization conversion mode and the second polarization conversion mode; The left polarization converter and the right polarization converter both need to receive two lights of different polarization states from the screen at the same time. In the first polarization conversion mode, the left polarization converter and the right polarization converter keep the polarization states of the two lights unchanged; in the second polarization conversion mode, the left polarization converter and the right polarization converter modulate the polarization states of the two lights in opposite or orthogonal directions; wherein the light from the screen includes two different polarization states at all times; The structures of the left polarizer and the right polarizer meet one of the following conditions: Case 1: the left polarizer and the right polarizer are horizontal linear polarizers, and the left polarization converter and the right polarization converter are TN liquid crystal cells or are in the second polarization conversion mode at zero voltage; Case 2: the left polarizer and the right polarizer are vertical linear polarizers, and the left polarization converter and the right polarization converter are VA liquid crystal cells or are in the first polarization conversion mode at zero voltage; Situation 3: the left polarizer is a horizontal linear polarizer and the left polarization converter is in the second polarization conversion mode, the right polarizer is a vertical linear polarizer and the right polarization converter is in the first polarization conversion mode; Situation 4: the right polarizer is a horizontal linear polarizer and the right polarization converter is in the second polarization conversion mode, the left polarizer is a vertical linear polarizer and the left polarization converter is in the first polarization conversion mode; Case 5: The left polarizer and the right polarizer are both circular polarizers comprising a vertical linear polarizer and a quarter-wavelength retardation film; the structural order of the left lens and the right lens can be flipped, and when the left polarizer and the right polarizer are flipped to be located outside, their respective vertical polarizers are located at the outermost side.

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