Three-dimensional image display system and method of operating the same

Abstract

The present application provides a three-dimensional image display system and an operating method thereof. The three-dimensional image display system comprises a display device and shutter glasses. The display device alternately displays a first picture suitable for left eye viewing and a second picture suitable for right eye viewing in time sequence. The first picture has a first luminance characteristic different from a second luminance characteristic of the second picture. The shutter glasses comprise a left eye shutter part, a right eye shutter part, an image sensor and a control circuit. When the image sensor senses the first luminance characteristic, the control circuit controls the right eye shutter part to be in a shielding state. When the image sensor senses the second luminance characteristic, the control circuit controls the left eye shutter part to be in a shielding state.

Description

TECHNICAL FIELD

[0001] The present application relates to a three-dimensional image display, and more particularly, to a three-dimensional image display system and an operating method thereof. BACKGROUND

[0002] Currently, three-dimensional (3D) image display systems provide glasses for users to wear. A 3D imaging implementation is that a user's left eye and right eye respectively view left-eye pictures and right-eye pictures through 3D glasses. Through special glasses lenses, a person's left and right eyes receive different image information, and then the two-eye images (parallax images) are combined into a stereoscopic image in the brain. For example, a display device can alternately display left-eye pictures and right-eye pictures in time sequence. Based on the switching timing of the left-eye pictures and the right-eye pictures, shutter glasses can synchronously shield one of the left-eye lenses and the right-eye lenses. Currently, 3D image display systems need to use an additional infrared emitter to transmit / emits synchronization information about the switching timing of the left-eye pictures and the right-eye pictures to the shutter glasses. The shutter glasses can shield one of the left-eye lenses and the right-eye lenses according to the timing of the received infrared signals (synchronization information). Whether the additional infrared emitter can be omitted does not affect the synchronization operation between the display device and the shutter glasses, which is one of many technical problems in the field of 3D image display technology. SUMMARY

[0003] The present application provides a three-dimensional (3D) image display system and an operating method thereof, so that the switching operation of the display device and the shutter glasses can be synchronized.

[0004] In embodiments according to the present application, the three-dimensional image display system comprises a display device and shutter glasses. The display device is configured to alternately display a first image adapted for left-eye viewing and a second image adapted for right-eye viewing in time sequence. The first image has a first luminance characteristic different from a second luminance characteristic of the second image. The shutter glasses comprise a left-eye shutter, a right-eye shutter, an image sensor, and a control circuit. The control circuit is configured to sense the first luminance characteristic of the first image and the second luminance characteristic of the second image by the image sensor. When the image sensor senses the first luminance characteristic, the control circuit controls the right-eye shutter to be in a shielding state. When the image sensor senses the second luminance characteristic, the control circuit controls the left-eye shutter to be in the shielding state. The first luminance characteristic comprises a first average luminance of the first image, the second luminance characteristic comprises a second average luminance of the second image, the first average luminance is different from the second average luminance, and a difference between the first average luminance and the second average luminance is not perceptible to a user. The not perceptible to the user is defined as follows: assuming one of the first average luminance and the second average luminance is LD, the other one of the first average luminance and the second average luminance is not LD and is between LD and i*LD, where i is a real number less than 1 and greater than 0.

[0005] In embodiments according to the present application, the operation method comprises: alternately displaying, by a display device of a three-dimensional image display system, a first image adapted for left-eye viewing and a second image adapted for right-eye viewing in time sequence, wherein the first image has a first luminance characteristic different from a second luminance characteristic of the second image; sensing, by a control circuit of shutter glasses of the three-dimensional image display system, the first luminance characteristic of the first image and the second luminance characteristic of the second image by an image sensor of the shutter glasses; when the image sensor senses the first luminance characteristic, controlling, by the control circuit, a right-eye shutter of the shutter glasses to be in a shielding state; and when the image sensor senses the second luminance characteristic, controlling, by the control circuit, a left-eye shutter of the shutter glasses to be in the shielding state. The first luminance characteristic comprises a first average luminance of the first image, the second luminance characteristic comprises a second average luminance of the second image, the first average luminance is different from the second average luminance, and a difference between the first average luminance and the second average luminance is not perceptible to a user. The not perceptible to the user is defined as follows: assuming one of the first average luminance and the second average luminance is LD, the other one of the first average luminance and the second average luminance is not LD and is between LD and i*LD, where i is a real number less than 1 and greater than 0.

[0006] Based on the above, the display device according to embodiments of the present application can make the first picture (left-eye picture) and the second picture (right-eye picture) have slightly different luminance characteristics. For example, the average luminance of the left-eye picture can be slightly brighter (or slightly darker) than the average luminance of the right-eye picture. The difference between the first luminance characteristic of the left-eye picture and the second luminance characteristic of the right-eye picture is sufficient for the shutter glasses to perceive, but is not perceived (or is not easily perceived) by the user. Based on the difference between the first luminance characteristic and the second luminance characteristic, the shutter glasses can determine whether the current display picture of the display device is a left-eye picture or a right-eye picture, and then dynamically control the left-eye shutter part or the right-eye shutter part to be in the shielding state according to the determination result. Therefore, the picture switching operation of the display device and the shielding switching operation of the shutter glasses can be synchronized. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 is a circuit block schematic diagram of a three-dimensional image display system according to an embodiment of the present application;

[0008] Figure 2 is a flowchart schematic diagram of an operation method of a three-dimensional image display system according to an embodiment of the present application;

[0009] Figure 3 is a flowchart schematic diagram of an operation method of a three-dimensional image display system according to another embodiment of the present application.

[0010] REFERENCE SIGNS

[0011] 100: three-dimensional (3D) image display system

[0012] 110: shutter glasses

[0013] 111: control circuit

[0014] 112: image sensor

[0015] 120: display device

[0016] 121: control circuit

[0017] 122: display panel

[0018] 123: backlight module

[0019] BL: backlight

[0020] IMG_L: first picture

[0021] IMG_R: second picture

[0022] SL: left-eye shutter part

[0023] SR: right-eye shutter part

[0024] S210-S250, S310-S395: steps DETAILED DESCRIPTION

[0025] Reference will now be made in detail embodiments of the application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or similar parts.

[0026] The term "coupled" or "connected" used in the entire description (including claims) of the present application can refer to any direct or indirect connection. For example, if a first device is described as being coupled or connected to a second device, it should be interpreted that the first device can be directly connected to the second device, or that the first device can be indirectly connected to the second device through other devices or some connection means. The terms "first", "second", and the like used in the entire description (including claims) of the present application are used to name components, or to distinguish different embodiments or ranges, and are not intended to limit the upper or lower limit of the number of components, nor to limit the order of components. In addition, wherever possible, the same reference numbers are used in the drawings and the embodiments to represent the same or similar parts. Components / elements / steps using the same reference numbers or using the same terms in different embodiments can be cross-referenced to the relevant description.

[0027] Figure 1 is a circuit block schematic diagram of a three-dimensional image display system 100 according to an embodiment of the present application. Figure 1 The three-dimensional (3D) image display system 100 shown includes shutter glasses 110 and a display device 120. In the 3D image display system 100 shown, the shutter glasses 110 are coupled to the display device 120. Figure 1 In the embodiment shown, the display device 120 includes a control circuit 121, a display panel 122, and a backlight module 123. Based on the control / drive of the control circuit 121, the backlight module 123 can provide backlight BL to the display panel 122, and the display panel 122 can display images for a user to view. In the application context of 3D images, the display device 120 can alternately display a first image (left-eye image) IMG L suitable for left-eye viewing and a second image (right-eye image) IMG R suitable for right-eye viewing in time sequence. The first luminance characteristic of the first image IMG L is different from the second luminance characteristic of the second image IMG R. For example, in some embodiments, the average luminance of the first image IMG L can be slightly brighter than the average luminance of the second image IMG R. In other embodiments, the average luminance of the first image IMG L can be slightly dimmer than the average luminance of the second image IMG R.

[0028] In the embodiment shown, the control circuit 121 includes a first control circuit 121a and a second control circuit 121b. The first control circuit 121a is configured to control the backlight module 123 to provide the backlight BL to the display panel 122. The second control circuit 121b is configured to control the display panel 122 to display the first image IMG L and the second image IMG R in time sequence. Figure 1In the illustrated embodiment, shutter glasses 110 include control circuit 111, image sensor 112, left-eye shutter portion SL, and right-eye shutter portion SR. A user can wear shutter glasses 110 and view a picture displayed by display panel 122 through left-eye shutter portion SL and / or right-eye shutter portion SR. Control circuit 111 can sense a first luminance characteristic of first picture IMG L and a second luminance characteristic of second picture IMG R by image sensor 112. The present embodiment is not limited to a specific implementation of image sensor 112. Depending on actual design, in some embodiments, image sensor 112 can include a rolling shutter image sensor (RSIS) and / or other sensors.

[0029] Figure 2 FIG. 1 is a schematic diagram of a three-dimensional image display system according to an embodiment of the present application. Please refer to FIG. 1. Figure 1 Figure 2 In step S210, display panel 122 of display device 120 alternately displays first picture IMG L suitable for left-eye viewing and second picture IMG R suitable for right-eye viewing in time sequence. First picture IMG L has a first luminance characteristic different from a second luminance characteristic of second picture IMG R. For example, in some embodiments, when display panel 122 displays first picture IMG L, control circuit 121 of display device 120 can adjust display backlight luminance (luminance of backlight BL) of backlight module 123 to a first luminance state so that first picture IMG L exhibits first luminance characteristic. When display panel 122 displays second picture IMG R, control circuit 121 can adjust display backlight luminance to a second luminance state different from the first luminance state so that second picture IMG R exhibits second luminance characteristic different from the first luminance characteristic.

[0030] ​For example, but not limited to, the first luminance feature includes a first average luminance of the first image IMG L, and the second luminance feature includes a second average luminance of the second image IMG R. Wherein, the first average luminance is different from the second average luminance, and the difference between the first average luminance and the second average luminance is not perceived (or not easily perceived) by a user. The definition of "not perceived by a user" can be determined according to the actual design. For example, but not limited to, the "not perceived by a user" can be defined as: assuming that one of the first average luminance of the first image IMG L and the second average luminance of the second image IMG R is LD, then the other one of the first average luminance and the second average luminance is not LD and is between LD and i*LD, where the coefficient i is a real number less than 1 and greater than 0. The coefficient i can be determined according to the actual design. For example, in some embodiments, the coefficient i can be 0.95 or other values.

[0031] In step S220, the control circuit 111 of the shutter glasses 110 can sense the current luminance feature of the image displayed by the display panel 122 through the image sensor 112. For example, when the display panel 122 displays the first image IMG L, the image sensor 112 can sense the first luminance feature of the first image IMG L in step S220. When the display panel 122 displays the second image IMG R, the image sensor 112 can sense the second luminance feature of the second image IMG R in step S220. The first luminance feature of the first image IMG L is different from the second luminance feature of the second image IMG R. Based on the difference between the first luminance feature and the second luminance feature, the control circuit 111 can determine whether the current luminance feature of the image displayed by the display panel 122 is the first luminance feature of the first image IMG L or the second luminance feature of the second image IMG R in step S230.

[0032] When the image sensor 112 senses the first luminance feature (the determination result of step S230 is "the first luminance feature of the first image"), the control circuit 111 can perform step S240 to control the right eye shutter part SR to be in the shielding state (the left eye shutter part SL is in the non-shielding state). When the image sensor 112 senses the second luminance feature (the determination result of step S230 is "the second luminance feature of the second image"), the control circuit 111 can perform step S250 to control the left eye shutter part SL to be in the shielding state (the right eye shutter part SR is in the non-shielding state).

[0033] For example, the control circuit 111 can sense a previous luminance characteristic of a previous frame displayed by the display panel 122 of the display device 120 via the image sensor 112. Then, the control circuit 111 can sense a current luminance characteristic of a current frame displayed by the display device via the image sensor 112, where the current frame is temporally adjacent to the previous frame. The control circuit 111 can compare the previous luminance characteristic with the current luminance characteristic. When the previous luminance characteristic is darker than the current luminance characteristic, the control circuit 111 can control one of the left shutter portion SL and the right shutter portion SR to be in the shielding state. When the previous luminance characteristic is brighter than the current luminance characteristic, the control circuit 111 can control the other one of the left shutter portion SL and the right shutter portion SR to be in the shielding state. For example, in some embodiments, the left shutter portion SL is in the shielding state (the right shutter portion SR is in the non-shielding state) when the previous luminance characteristic is darker than the current luminance characteristic, and the right shutter portion SR is in the shielding state (the left shutter portion SL is in the non-shielding state) when the previous luminance characteristic is brighter than the current luminance characteristic. In other embodiments, the right shutter portion SR is in the shielding state (the left shutter portion SL is in the non-shielding state) when the previous luminance characteristic is darker than the current luminance characteristic, and the left shutter portion SL is in the shielding state (the right shutter portion SR is in the non-shielding state) when the previous luminance characteristic is brighter than the current luminance characteristic.

[0034] In summary, the display device 120 of the above-described embodiments can cause the first frame (left-eye frame) IMG L and the second frame (right-eye frame) IMG R to have slightly different luminance characteristics. For example, the average luminance of the first frame IMG L can be slightly brighter (or slightly darker) than the average luminance of the second frame IMG R. The difference between the first luminance characteristic of the first frame IMG L and the second luminance characteristic of the second frame IMG R is sufficient for the shutter glasses 110 to perceive, but is imperceptible (or not easily perceptible) to the user. Based on the difference between the first luminance characteristic and the second luminance characteristic, the shutter glasses can determine whether the current display frame of the display device 120 is the first frame IMG L or the second frame IMG R, and dynamically control the left shutter portion SL or the right shutter portion SR to be in the shielding state according to the determination result. Thus, the frame switching operation of the display device 120 and the shielding switching operation of the shutter glasses 110 can be synchronized.

[0035] Figure 3 is a flowchart of an operation method of a three-dimensional image display system according to another embodiment of the present application. In Figure 3In the illustrated embodiment, the 3D image display system 100 can increase the frame rate of the display device 120 according to the present flicker rate during an initialization period, and then decrease the detection frequency of the image sensor 112 according to the increased frame rate of the display device 120 to reduce the power consumption of the shutter glasses 110. The present flicker rate is related to a first flicker rate corresponding to the ambient light and a second flicker rate corresponding to the display device 120. The initialization period can include Figure 3 The steps S320, S330, S340 and S350 are illustrated. After the initialization period ends, the 3D image display system 100 can enter a normal operation period to perform Figure 3 The steps S360, S370, S380, S390 and S395 are illustrated. Figure 3 The steps S360, S370, S380, S390 and S395 can be referred to the related descriptions of the steps S320, S330, S340 and S350, and thus are not described again. Figure 2 The steps S210, S220, S230, S240 and S250 are illustrated. The steps S360, S370, S380, S390 and S395 can be referred to the related descriptions of the steps S210, S220, S230, S240 and S250, and thus are not described again.

[0036] The steps S210, S220, S230, S240 and S250 are illustrated. The steps S360, S370, S380, S390 and S395 can be referred to the related descriptions of the steps S210, S220, S230, S240 and S250, and thus are not described again. Figure 1 The steps S360, S370, S380, S390 and S395 can be referred to the related descriptions of the steps S320, S330, S340 and S350, and thus are not described again. Figure 3 After the system is started (step S310), the 3D image display system 100 can calculate the present flicker rate PF (step S320). The present flicker rate PF is related to a first flicker rate fl corresponding to the ambient light and a second flicker rate f2 corresponding to the display device 120. The 3D image display system 100 can increase the frame rate of the display device 120 according to the present flicker rate PF (step S330).

[0037] For example, the control circuit 111 can sense the first flicker rate fl mainly contributed by the ambient light through the image sensor 112. In some practical application scenarios, the display device 120 can turn off (or pause) the display operation of the display panel 122, and the control circuit 111 can sense the first flicker rate fl through the image sensor 112. Since the display panel 122 has been turned off, the first flicker rate fl sensed by the image sensor 112 is mainly contributed by the stroboscopic of the ambient light. Generally, the stroboscopic of the ambient light is about 60 Hz. After the first flicker rate fl is measured, the display device 120 can turn on (or resume) the display operation of the display panel 122. The control circuit 111 can sense the second flicker rate f2 mainly contributed by the frame rate of the display device 120 through the image sensor 112.

[0038] The control circuit 111 can use the first flicker rate f1 and the second flicker rate f2 to calculate a present flicker rate PF. For example, but not limited to, the control circuit 111 can calculate PF = [(f2-f1) / (f2+f1)]*100% to obtain the present flicker rate PF. The control circuit 111 can send an adjustment request to the display device 120 according to the present flicker rate PF to increase the frame rate of the display device 120 as much as possible. For example, but not limited to, the control circuit 111 can compare the present flicker rate PF with a first threshold. The control circuit 111 can send an adjustment request to adjust the frame rate of the display device 120 if the present flicker rate PF is greater than the first threshold. In addition, the control circuit 111 can send an adjustment request to adjust the frame rate of the display device 120 if the second flicker rate is less than a second threshold. The first threshold and the second threshold can be determined according to actual design.

[0039] For example, assume that the frame rate of the display device 120 has ten steps, in which the first step has the minimum frame rate and the tenth step has the maximum frame rate. It should be noted that the number of steps, the minimum frame rate and the maximum frame rate can be determined according to actual design. Assume further that, according to actual design, the first threshold can be 37% (or other value) and the second threshold can be 120 Hz (or other value). At the beginning of step S330, the control circuit 111 can send an adjustment request to adjust the frame rate of the display device 120 to the tenth step (the maximum frame rate), and then the control circuit 111 can sense the present second flicker rate f2 through the image sensor 112 and calculate the present flicker rate PF. The control circuit 111 can check the present flicker rate PF and the second flicker rate f2. When the present flicker rate PF is greater than 37% (under the condition that the second flicker rate f2 is greater than or equal to 120 Hz), the control circuit 111 can decrease the frame rate of the display device 120 from the tenth step to the ninth step, and then the control circuit 111 re-obtains the present second flicker rate f2 and the present flicker rate PF. In this way, the control circuit 111 can continue to decrease the frame rate of the display device 120 until the present flicker rate PF is less than or equal to 37% (under the condition that the second flicker rate f2 is greater than or equal to 120 Hz). Therefore, the control circuit 111 of the shutter glasses 110 can adjust the frame rate of the display device 120 as much as possible according to the present flicker rate PF.

[0040] In the above embodiments, the calculation of the present flicker rate PF and the decision of the frame rate adjustment are performed by the control circuit 111 of the shutter glasses 110. However, the embodiments of the present application are not limited thereto. For example, in other embodiments, the control circuit 111 can provide the display device 120 with the information of the first flicker rate fl and the second flicker rate f2. The control circuit 121 of the display device 120 can calculate the present flicker rate PF using the first flicker rate fl and the second flicker rate f2, and the control circuit 121 of the display device 120 can adjust the frame rate of the display panel 122 as much as possible according to the present flicker rate PF.

[0041] By adjusting the detection frequency of the image sensor 112 as much as possible, the power consumption of the shutter glasses 110 can be reduced as much as possible. In step S340, the control circuit 111 can adjust the detection frequency of the image sensor 112 as much as possible according to the adjusted frame rate of the display device 120. For example (but not limited thereto), the control circuit 111 can adjust the detection frequency of the image sensor 112 as much as possible under the condition that the detection frequency of the image sensor 112 is greater than or equal to the frame rate of the display panel 122.

[0042] In step S350, the display device 120 can display two test pictures with different luminance characteristics (the first luminance characteristic and the second luminance characteristic) in time division. In some practical designs, the contents of the two test pictures are consistent. In other practical designs, the contents of the two test pictures can be different from each other. The control circuit 111 can sense the luminance characteristics (the first luminance characteristic and the second luminance characteristic) of the two test pictures in time division by the image sensor 112. The control circuit 111 can record the related setting parameters (sensing parameters) of the first luminance characteristic and the second luminance characteristic in step S350. After obtaining the first luminance characteristic and the second luminance characteristic, the control circuit 111 can perform steps S360-S395 so that the shielding switching operation (the shielding switching of the left shutter portion SL and the right shutter portion SR) of the shutter glasses 110 can be synchronized with the picture switching operation (the display switching of the first picture IMG_L and the second picture IMG_R) of the display device 120. Figure 3 The steps S360-S395 can be referred to the related descriptions of steps S210-S250, and thus will not be described in detail. Figure 2 The steps S210-S250 can be referred to the related descriptions of steps S360-S395, and thus will not be described in detail.

[0043] According to different design requirements, the implementation of the control circuit 111 and / or the control circuit 121 can be hardware, firmware, software (i.e., a program), or a combination of multiple ones of the foregoing. In the form of hardware, the control circuit 111 and / or the control circuit 121 can be implemented as a logic circuit on an integrated circuit. The functions of the control circuit 111 and / or the control circuit 121 can be implemented as hardware using a hardware description language (e.g., Verilog HDL or VHDL) or other suitable programming language. For example, the functions of the control circuit 111 and / or the control circuit 121 can be implemented in various logic blocks, modules, and circuits of one or more controllers, microcontrollers, microprocessors, application-specific integrated circuits (ASICs), digital signal processors (DSPs), field programmable gate arrays (FPGAs), and / or other processing units. In the form of software and / or firmware, the functions of the control circuit 111 and / or the control circuit 121 can be implemented as programming codes. For example, the control circuit 111 and / or the control circuit 121 can be implemented using general programming languages (e.g., C, C++, or assembly language) or other suitable programming languages. The programming codes can be recorded / stored in a “non-transitory computer readable medium”. In some embodiments, the non-transitory computer readable medium includes, for example, a read-only memory (ROM), a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, and / or a storage device. The storage device includes a hard disk drive (HDD), a solid-state drive (SSD), or other storage devices. A central processing unit (CPU), a controller, a microcontroller, or a microprocessor can read and execute the programming codes from the non-transitory computer readable medium to implement the functions of the control circuit 111 and / or the control circuit 121.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A three-dimensional image display system, characterized by comprising: The three-dimensional image display system comprises: a display device for alternately displaying a first picture adapted for left-eye viewing and a second picture adapted for right-eye viewing in time sequence, wherein a first luminance characteristic of the first picture is different from a second luminance characteristic of the second picture; and shutter glasses comprising a left-eye shutter portion, a right-eye shutter portion, an image sensor, and a control circuit, wherein the control circuit is configured to sense the first luminance characteristic of the first picture and the second luminance characteristic of the second picture by the image sensor, to control the right-eye shutter portion to be in a shielding state when the image sensor senses the first luminance characteristic, and to control the left-eye shutter portion to be in the shielding state when the image sensor senses the second luminance characteristic; wherein the first luminance characteristic comprises a first average luminance of the first picture, the second luminance characteristic comprises a second average luminance of the second picture, the first average luminance is different from the second average luminance, and a difference between the first average luminance and the second average luminance is not perceptible to a user; wherein user unaware is defined as: assuming one of the first average luminance and the second average luminance is LD, then the other of the first average luminance and the second average luminance is not LD and is between LD and LD + i * (max - min), where i is a real number less than 1 and greater than 0. wherein user unaware is defined as: assuming one of the first average luminance and the second average luminance is LD, then the other of the first average luminance and the second average luminance is not LD and is between LD and LD + i * (max - min), where i is a real number less than 1 and greater than 0. wherein the three-dimensional image display system adjusts a frame rate of the display device according to a current flicker rate, the control circuit adjusts a detection frequency of the image sensor according to the adjusted frame rate of the display device, the current flicker rate is related to a first flicker rate corresponding to ambient light and a second flicker rate corresponding to the display device, the control circuit senses the first flicker rate mainly contributed by the ambient light by the image sensor, the control circuit senses the second flicker rate mainly contributed by the frame rate of the display device by the image sensor, the control circuit calculates the current flicker rate using the first flicker rate and the second flicker rate, and the control circuit sends an adjustment request to the display device to adjust the frame rate of the display device according to the current flicker rate.

2. The three-dimensional image display system according to claim 1, wherein The display device adjusts a display backlight luminance to a first luminance state to make the first picture present the first luminance characteristic, the display device adjusts the display backlight luminance to a second luminance state to make the second picture present the second luminance characteristic, and the first luminance state is different from the second luminance state.

3. The three-dimensional image display system of claim 1, wherein: the control circuit senses a previous luminance characteristic of a previous picture displayed by the display device by the image sensor; the control circuit senses a current luminance characteristic of a current picture displayed by the display device by the image sensor, wherein the current picture is adjacent to the previous picture in time; the control circuit compares the previous luminance characteristic with the current luminance characteristic; when the previous luminance characteristic is darker than the current luminance characteristic, the control circuit controls one of the left-eye shutter portion and the right-eye shutter portion to be in the shielding state; and the control circuit controls the other of the left-eye shutter portion and the right-eye shutter portion to be in a non-shielding state. When the previous brightness feature is brighter than the current brightness feature, the control circuit controls the other one of the left shutter portion and the right shutter portion to be in the shielding state.

4. The three-dimensional image display system of claim 1, wherein said first flicker rate is f1, said second flicker rate is f2, and said control circuit calculates to obtain said present flicker rate PF.

5. The three-dimensional image display system according to claim 1, wherein The control circuit compares the current flicker rate with a first threshold, and the control circuit issues the adjustment request to adjust the frame rate of the display device when the current flicker rate is greater than the first threshold.

6. The three-dimensional image display system according to claim 5, wherein The control circuit further issues the adjustment request to adjust the frame rate of the display device when the second flicker rate is greater than or equal to a second threshold.

7. The three-dimensional image display system of claim 1, wherein The control circuit further adjusts the detection frequency of the image sensor when the detection frequency is greater than or equal to the frame rate.

8. An operating method of a three-dimensional image display system, characterized by, The operation method further comprises: displaying, by a display device of the three-dimensional image display system, a first image suitable for left-eye viewing and a second image suitable for right-eye viewing alternately in time sequence, wherein a first brightness feature of the first image is different from a second brightness feature of the second image; sensing, by a control circuit of shutter glasses of the three-dimensional image display system, the first brightness feature of the first image and the second brightness feature of the second image by an image sensor of the shutter glasses; controlling, by the control circuit, a right shutter portion of the shutter glasses to be in a shielding state when the image sensor senses the first brightness feature; controlling, by the control circuit, a left shutter portion of the shutter glasses to be in the shielding state when the image sensor senses the second brightness feature; adjusting, by the control circuit, a frame rate of the display device according to a current flicker rate, wherein the current flicker rate is related to a first flicker rate corresponding to ambient light and a second flicker rate corresponding to the display device; adjusting, by the control circuit, a detection frequency of the image sensor according to the frame rate of the display device after being adjusted; sensing, by the control circuit, the first flicker rate mainly contributed by the ambient light by the image sensor; sensing, by the control circuit, the second flicker rate mainly contributed by the frame rate of the display device by the image sensor; calculating, by the control circuit, the current flicker rate using the first flicker rate and the second flicker rate; and issuing, by the control circuit, an adjustment request to the display device according to the current flicker rate to increase the frame rate of the display device wherein the first brightness feature comprises a first average brightness of the first image, the second brightness feature comprises a second average brightness of the second image, the first average brightness is different from the second average brightness, and a difference between the first average brightness and the second average brightness is not perceived by a user; wherein user unaware is defined as: assuming one of the first average luminance and the second average luminance is LD, then the other of the first average luminance and the second average luminance is not LD and is between LD and LD + i * (Lmax - LD), where i is a real number less than 1 and greater than 0.

9. The method of claim 8, wherein, The operation method further comprises: adjusting, by the display device, a display backlight brightness to a first brightness state to make the first image present the first brightness feature; and adjusting, by the display device, the display backlight brightness to a second brightness state to make the second image present the second brightness feature, wherein the first brightness state is different from the second brightness state.

10. The operating method according to claim 8, characterized in that, The operation method further comprises: sensing, by the control circuit, a previous luminance characteristic of a previous frame displayed by the display device via the image sensor; sensing, by the control circuit, a current luminance characteristic of a current frame displayed by the display device via the image sensor, wherein the current frame is temporally adjacent to the previous frame; comparing, by the control circuit, the previous luminance characteristic and the current luminance characteristic; controlling, by the control circuit, one of the left shutter portion and the right shutter portion to the occluded state when the previous luminance characteristic is darker than the current luminance characteristic; and controlling, by the control circuit, the other of the left shutter portion and the right shutter portion to the occluded state when the previous luminance characteristic is brighter than the current luminance characteristic.

11. The operating method according to claim 8, characterized in that, The operation method further comprises: calculating, by the control circuit to obtain the present flicker rate PF, wherein fi is the first flicker rate and f2 is the second flicker rate.

12. The operating method according to claim 8, characterized in that, The operation method further comprises: comparing, by the control circuit, the current flicker rate and a first threshold; and issuing, by the control circuit, the adjustment request to adjust the frame rate of the display device when the current flicker rate is greater than the first threshold.

13. The method of operation of claim 12, wherein, The operation method further comprises: issuing, by the control circuit, the adjustment request to adjust the frame rate of the display device when the second flicker rate is greater than or equal to a second threshold.

14. The operating method according to claim 8, characterized in that, The operation method further comprises: adjusting, by the control circuit, the detection frequency when the detection frequency is greater than or equal to the frame rate.

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