Patent Publication Number: US-2012033061-A1

Title: Shutter glasses capable of changing polarization direction thereof, and associated control system, control method and transmitter

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a pair of shutter glasses, and more particularly, to a pair of shutter glasses for watching a plurality of different types of display apparatuses, and related control system, control method and transmitter thereof. 
     2. Description of the Prior Art 
     Please refer to  FIG. 1 , which is a diagram illustrating a structure of a pair of conventional three-dimensional (3D) glasses  100  and related optical theory thereof. As shown in  FIG. 1 , the pair of 3D glasses  100  is utilized for watching a display apparatus  110  whose image light output has a polarization direction at 135 degrees. Each lens of the pair of 3D glasses  100  includes a front polarizer  102 , a liquid crystal (LC) layer  104  and a back polarizer  106 . Regarding the operation of the pair of 3D glasses  100 , the voltage V LC  on the LC layer  104  determines whether light is allowed to transmit through the lens. For example, when the voltage V LC  on the LC layer  104  is 0V, light transmitted through the LC layer  104  has its polarization direction changed to 45 degrees, and then transmits through the back polarizer  106  successfully; on the contrary, when the voltage V LC  on the LC layer  104  is 12V, light transmitted through the LC layer  104  has its polarization direction still maintained at 135 degrees, and fails to transmit through the back polarizer  106 . Therefore, by providing control voltages on LC layers corresponding to the left-eye lens and the right-eye lens alternately, the pair of 3D glasses  100  may let the user&#39;s left eye and right eye respectively receive suitable images, leading to superimposed images regarded as stereo images in the user&#39;s brain. 
     However, the pair of 3D glasses  100  shown in  FIG. 1  is only suitable for a display apparatus whose image light output has a polarization directions at 135 degrees, and cannot be used by a user to watch display apparatuses whose image light outputs have other polarization directions, e.g. TN (Twisted Nematic) liquid crystal display (LCD) apparatus whose polarization direction is at 45 degrees, IPS (In-plane Switching) LCD apparatus whose polarization direction is at 0 degree, VA (Vertical Alignment) LCD apparatus whose polarization direction is at 90 degrees, etc. Thus, since the pair of 3D glasses  100  may not be suitable for all types of display apparatuses, manufacturers have to redesign the pair of 3D glasses according to each display apparatus type, and the production cost is increased inevitably. Besides, one user has to buy a plurality pairs of 3D glasses suitable for watching a plurality of types of display apparatuses, resulting in unnecessary waste. 
     SUMMARY OF THE INVENTION 
     Therefore, one of the objectives of the present invention is to provide a pair of glasses capable for watching a plurality of different types of display apparatuses, to solve the problem mentioned above. 
     According to a first aspect of the present invention, an exemplary pair of shutter glasses comprises a frame, two lenses disposed on the frame, and a control chip. The control chip is configured to select one of a plurality of operation modes according to a type of the display apparatus to set the pair of shutter glasses, wherein the operation modes respectively correspond to a plurality of types of display apparatuses. 
     According to a second aspect of the present invention, an exemplary control system for controlling a pair of shutter glasses comprises a transmitter disposed in a display apparatus. The transmitter is configured to transmit the information of the display apparatus to the pair of shutter glasses to set the pair of shutter glasses, wherein the information comprises at least one of a type of the display apparatus, a product name of the display apparatus, a corresponding value of the display apparatus, and a polarization direction of an image light output generated by the display apparatus. 
     According to a third aspect of the present invention, an exemplary method for controlling a pair of shutter glasses comprises: providing information of the display apparatus, wherein the information comprises at least one of a type of the display apparatus, a product name of the display apparatus, a corresponding value of the display apparatus, and a polarization direction of an image light output generated by the display apparatus; and transmitting the information to the pair of glasses to set the pair of shutter glasses. 
     According to a fourth aspect of the present invention, an exemplary transmitter comprises an interface circuit, a control unit and a transmitting unit. The interface circuit receives the information of the display apparatus. The control unit is coupled to the interface circuit, and implemented for generating a control signal according to the information, wherein the control signal sets the pair of shutter glasses for selecting one of a plurality of operation modes. The transmitting unit is coupled to the control unit, and implemented for transmitting the control signal to the pair of shutter glasses. 
     These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a diagram illustrating a structure of a pair of conventional three-dimensional glasses and related optical theory thereof. 
         FIG. 2  is a diagram illustrating a pair of shutter glasses according to an exemplary embodiment of the present invention. 
         FIG. 3  is a diagram illustrating a shutter lens shown in  FIG. 1  according to an exemplary embodiment of the present invention. 
         FIG. 4  is a diagram illustrating that a control chip applies voltages on the LC layer when the polarization directions of image light outputs generated by the display apparatuses are respectively at 0 degree, 45 degrees, 90 degrees, 135 degrees. 
         FIG. 5  is a diagram illustrating a pair of shutter glasses according to another exemplary embodiment of the present invention. 
         FIG. 6  is a diagram illustrating a shutter lens shown in  FIG. 5  according to an exemplary embodiment of the present invention. 
         FIG. 7  is a diagram illustrating that a control chip applies voltages on the first LC layer and the second LC layer shown in  FIG. 6  when the polarization directions of image light outputs generated by the display apparatuses are respectively at 0 degree, 45 degrees, 90 degrees and 135 degrees. 
         FIG. 8  is a diagram illustrating a pair of shutter glasses according to another exemplary embodiment of the present invention. 
         FIG. 9  is a diagram illustrating that a transmitter is employed to control an operation mode of a pair of glasses according to an exemplary embodiment of the present invention. 
         FIG. 10  is a diagram illustrating a structure of the transmitter shown in  FIG. 9 . 
         FIG. 11  is a diagram illustrating a pair of shutter glasses with a control panel according to another exemplary embodiment of the present invention. 
         FIG. 12  is a diagram illustrating a control system for controlling a pair of shutter glasses according to an exemplary embodiment of the present invention. 
         FIG. 13  is a flowchart illustrating a method for controlling a pair of shutter glasses according an exemplary embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Please refer to  FIG. 2 , which is a diagram illustrating a pair of shutter glasses  200  according to an exemplary embodiment of the present invention. As shown in  FIG. 2 , the pair of shutter glasses  200  includes a frame  210 , two shutter lenses  220 _ 1 ,  220 _ 2 , a control chip  240  disposed in the frame  210 , and a battery  250 , wherein the battery  250  supplies power to the control chip  240 , and the control chip  240  is configured to control the voltage applied to LC layers in the two LC lenses  220 _ 1 ,  220 _ 2 . 
     Please refer to  FIG. 3 , which is a diagram illustrating a shutter lens  220  according to an exemplary embodiment of the present invention. The shutter lens  220  may be either of the two shutter lenses  220 _ 1 ,  220 _ 2  shown in  FIG. 2 . As shown in  FIG. 3 , the shutter lens  220  includes a first transparent conductive glass  310 , an LC layer  320 , a second transparent conductive glass  330  and a polarizer  340 . 
     Regarding the operation of the pair of shutter glasses  200 , the control chip  240  is configured to select one of a plurality of voltage values according to the polarization direction of the image light output generated by a display apparatus, and the selected voltage value is utilized as the voltage applied to each of the two shutter lenses  220 _ 1 ,  220 _ 2 , wherein the voltage values respectively correspond to a plurality of different types of display apparatuses whose image light outputs have different polarization directions. For example, please refer to the sub-diagrams (a)-(d) of  FIG. 4 . When the polarization directions of image light outputs generated by display apparatuses are respectively at 0 degree, 45 degrees, 90 degrees, and 135 degrees, the control chip  240  is configured to respectively control the voltage V LC  across the LC layer  320  by 2V/0V, 2.3V/0V, 2.8V/0V and 3.1V/0V. That is, when the polarization direction of an image light output generated by a display apparatus is at 0 degree, the control chip  240  is configured to control the voltage V LC  across the LC layer  320  to switch between 2V and 0V, when the polarization direction of an image light output generated by a display apparatus is at 45 degrees, the control chip  240  is configured to control the voltage V LC  across the LC layer  320  to switch between 2.3V and 0V, and so forth. So, shutter lenses  220 _ 1 ,  220 _ 2  may correctly and effectively allow light to transmit therethrough and prevent light from transmitting therethrough, thereby allowing user&#39;s left eye and right eye to respectively receive suitable images and resulting in superimposed images regarded as stereo images in the user&#39;s brain. In other words, in this exemplary embodiment, the control chip  240  is configured to directly control the rotation degree of the image light within the LC layers  320  via supplying different voltages to the LC layers  320  of the shutter lenses  220 _ 1 ,  220 _ 2  for different types of display apparatuses whose image light outputs have different polarization directions. Moreover, it should be noted that the polarization directions of the image light outputs generated by the display apparatuses shown in  FIG. 4  and the corresponding voltage V LC  thereof are for illustrative purposes only, and are not meant to be limitations to the present invention. 
     Please refer to  FIG. 5 , which is a diagram illustrating a pair of shutter glasses  500  according to another exemplary embodiment of the present invention. As shown in  FIG. 5 , the pair of shutter glasses  500  includes a frame  510 , two shutter lenses  520 _ 1 ,  520 _ 2 , a control chip  540  disposed in the frame  510 , and a battery  550 , wherein the battery  550  supplies power to the control chip  540 , and the control chip  540  is configured to control the voltages on the LC layers of the two shutter lenses  520 _ 1 ,  520 _ 2 . 
     Please refer to  FIG. 6 , which is a diagram illustrating a shutter lens  620  according to an exemplary embodiment of the present invention. The shutter lens  620  may be either of the two shutter lenses  520 _ 1 ,  520 _ 2  shown in  FIG. 5 . As shown in  FIG. 6 , the shutter lens  620  includes a first transparent conductive glass  610 , a first LC layer  620 , a second transparent conductive glass  630 , a second LC layer  640 , a third transparent conductive glass  650  and a polarizer  660 . Besides, in another exemplary embodiment of the present invention, the second transparent conductive glass  630  may also be composed of two glasses. 
     Please note that the transparent conductive glass mentioned above may be an optional component. Therefore, in other exemplary embodiments, the transparent conductive glass may be omitted or replaced by a similar component, and the number and material thereof are not limited. 
     Regarding the operation of the pair of shutter glasses  500 , the control chip  540  is configured to select one of a plurality of voltage values according to a polarization direction of an image light output generated by a display apparatus, and the selected voltage value is arranged to be the voltage applied to the first LC layer  620  in each of the shutter lenses  520 _ 1 ,  520 _ 2 , wherein the voltage values respectively correspond to a plurality of different types of display apparatuses whose image light outputs have different polarization directions. Moreover, the control chip  540  is further configured to control the voltage applied to the second LC layer  640  in each of the shutter lenses  520 _ 1 ,  520 _ 2  to thereby control if the polarization direction of the incident light should have a 90-degree rotation. For example, please refer to sub-diagrams (a)-(d) of  FIG. 7 . When the polarization directions of the image light outputs generated by the display apparatuses are respectively at 0 degree, 45 degrees, 90 degrees, and 135 degrees, the control chip  540  is configured to respectively control the voltage V LC1  across the first LC layer  620  by 2V, 2.3V, 2.8V and 3.1V, and controls the voltage V LC2  across the second LC layer  640  by 12V/0V. That is, when the polarization direction of the image light output generated by a display apparatus is at 0 degree, the control chip  540  is configured to control the voltage V LC1  across the first LC layer  620  by a constant voltage level 2V (i.e., no voltage switching operation is performed), and control the voltage V LC2  across the second LC layer  640  to switch between 12V and 0V, when the polarization direction of the image light output generated by a display apparatus is at 45 degrees, the control chip  540  is configured to control the voltage V LC1  across the first LC layer  620  by a constant voltage level 2.3V (i.e., no voltage switching operation is performed), and control the voltage V LC2  across the second LC layer  640  to switch between 12V and 0V, and so forth. So, the shutter lenses  520 _ 1 ,  520 _ 2  may correctly and effectively allow light to transmit therethrough or prevent light from transmitting therethrough, thereby allowing the user&#39;s left eye and right eye to respectively receive suitable images and resulting in superimposed images regarded as stereo images in the user&#39;s brain. In other words, the control chip  540  is configured to directly control the rotation degree of image light within the first LC layer  620  by supplying different voltages to the first LC layers  620  of the shutter lenses  520 _ 1 ,  520 _ 2  for different types of display apparatuses whose image light outputs have different polarization directions. In this way, after the image light has transmitted through the first LC layer  620 , the polarization direction thereof is parallel with or perpendicular to the polarizer  660  shown in  FIG. 6 . Moreover, it should be noted that the polarization directions of the image light outputs generated by the display apparatuses shown in  FIG. 7  and related voltages V LC1 , V LC2  are for illustrative purposes only, and are not meant to be limitations of the present invention. 
     Compared with the pair of conventional 3D glasses  100  shown in  FIG. 1 , the pair of shutter glasses  200  shown in  FIG. 2  and the pair of shutter glasses  500  shown in  FIG. 5  are suitable for a plurality of different types of display apparatuses whose image light outputs have different polarization directions. So, manufacturers do not have to redesign the pair of 3D glasses according to each display apparatus type, and the production cost is saved accordingly. Besides, to watch different types of display apparatuses, one user only needs to buy one pair of 3D glasses, which prevents the user for spending extra money on buying the pair of shutter glasses. 
     Please refer to  FIG. 8 , which is a diagram illustrating a pair of shutter glasses  800  according to another exemplary embodiment of the present invention. As shown in  FIG. 8 , the pair of shutter glasses  800  includes a frame  810 , two shutter lenses  820 _ 1 ,  820 _ 2 , a control chip  840  disposed in the frame  810 , and a battery  850 , wherein the battery  850  supplies power to the control chip  840 , and the control chip  840  is configured to control voltages applied to the LC layers in the two shutter lenses  820 _ 1 ,  820 _ 2 . 
     Regarding the operation of the pair of shutter glasses  800 , the control chip  840  is configured to determine a driving manner (on/off switching mode) for controlling the two shutter lenses  820 _ 1 ,  820 _ 2  according to a type of a display apparatus. For example, the control chip  840  is configured to select one of a plurality of on/off switching frequencies according to a type of the display apparatus to control the on/off statuses of the two shutter lenses  820 _ 1 ,  820 _ 2 , or selects at least one of a plurality of on/off time lengths, on/off cycles, on/off times, and on/off ratios according to the type of the display apparatus to control the on/off statuses of the two shutter lenses  820 _ 1 ,  820 _ 2 . 
     An operation mode of the aforementioned pair of shutter glasses  200  shown in  FIG. 2 , the aforementioned pair of shutter glasses  500  shown in  FIG. 5 , the aforementioned pair of shutter glasses  800  shown in  FIG. 8  or any other pair of glasses capable of adjusting the polarization direction may be controlled by a signal generated from a transmitter or may be manually controlled by the user. The detailed description is given as below. 
     Please refer to  FIG. 9 , which is a diagram illustrating that a transmitter  900  is employed to control an operation mode of a pair of shutter glasses  910  according to an exemplary embodiment of the present invention. As shown in  FIG. 9 , the transmitter  900  is connected to a display apparatus  930  through a universal serial bus (USB) connection cable. The pair of shutter glasses  910  has a plurality of operation modes, and the operation modes respectively correspond to a plurality of types of display apparatuses. That is, the pair of shutter glasses  910  may be the pair of shutter glasses  200  shown in  FIG. 2 , the pair of shutter glasses  500  shown in  FIG. 5 , the pair of shutter glasses  800  shown in  FIG. 8 , or any other pair of glasses capable of adjusting the polarization direction. Besides, please also refer to  FIG. 10 , which is a diagram illustrating the structure of the transmitter  900 . The transmitter  900  includes a control panel  902 , a control unit  904 , an interface circuit (a USB interface  906  in this exemplary embodiment) and a transmitting unit  908 , wherein the control panel  902  may be any operating panel which allows the user to select an operation mode manually. However, the control panel  902  may be optional. That is, in some exemplary embodiments illustrated below, the control panel  902  may be removed from the transmitter  900  without affecting the operation of the present invention. Besides, in other exemplary embodiments of the present invention, the transmitter  900  may be connected to the display apparatus via other connecting/transmitting modes, and the USB interface  906  may be replaced by other standard interface circuit. In the following illustration directed to using the transmitter  900  to control the operation mode of the pair of shutter glasses  910 , only operation modes respectively corresponding to a plurality of types of display apparatuses whose image light outputs have different polarization directions are illustrated. 
     Regarding the operation of the transmitter  900 , the control unit  904  is configured to generate a control signal by searching a look-up table according to a user input from the control panel  902 , and then the transmitting unit  908  transmits the control signal to the pair of shutter glasses  910  via infrared transmission, wireless transmission, ZigBee transmission, WiFi transmission, Bluetooth transmission, ultrawideband (UWB) transmission, DLP light signal transmission, etc. A control chip (not shown) in the pair of shutter glasses  910  is configured to select one of the operation modes to set the pair of shutter glasses  910  according to the information carried by the control signal, such that the pair of shutter glasses  910  is suitable for viewing the image light output generated by the display apparatus  930 . 
     Moreover, in another exemplary embodiment of the present invention, the transmitter  900  may also analyze information from the display apparatus  930 , such as extended display identification data (EDID), USB description or any other information that has identification information of the display apparatus  930 , and transmits a proper control signal to the pair of shutter glasses  910  according to the information. Therefore, the control chip in the pair of shutter glasses  910  is configured to select one of the operation modes according to the control signal to set the pair of shutter glasses  910 , such that the pair of shutter glasses  910  is suitable for viewing image light output generated by the display apparatus  930 . In this exemplary embodiment, the control panel  902  shown in  FIG. 10  may be removed from the transmitter  900  without affecting the operation of the present invention. 
     In another exemplary embodiment of the present invention, the transmitter  900  may actively request the display apparatus  930  for related information of the display apparatus. For example, the display apparatus  930  may display an on-screen display (OSD) shown in  FIG. 9  for allowing the user to determine how to set the operation mode of the pair of shutter glasses  910 . If the user selects “auto setting” in the OSD, the display apparatus  930  actively transmits related information of the display apparatus (e.g. polarization direction of image light) or a corresponding value of the display apparatus (e.g. value=1) to the transmitter  900 . Next, the transmitter  900  generates a control signal by searching the look-up table or using other manners according to the related information of the display apparatus or the corresponding value, and transmits the control signal to the pair of shutter glasses  910 , such that the control chip in the pair of shutter glasses  910  is configured to select one of the operation modes according to the control signal to set the pair of shutter glasses  910 . If the user selects “manual switching mode” in the OSD, the OSD will further display more options for the user, meanwhile, the user may freely select one of the options that may allow the user to perceive image light with highest brightness via the pair of shutter glasses  910  to act as a best operation mode of the pair of shutter glasses  910 . In this exemplary embodiment, the control panel  902  shown in  FIG. 10  may be removed from the transmitter  900  without affecting the operation of the present invention. 
     In another exemplary embodiment of the present invention, if the display apparatus  930  and the transmitter  900  are particularly designed (e.g., the transmitter  900  and the display apparatus  930  are both designed by the same manufacturer), the transmitter  900  does not need to analyze the type of the display apparatus  930  or related information of polarization direction of image light. The transmitter  900  may generate a control signal by searching a look-up table or other manners only according to one or more corresponding values from the display apparatus  930  (e.g., when the corresponding value=0, the type of the display apparatus is # 1 ; when the corresponding value=1, the type of the display apparatus is # 2 , and so forth), and transmits the control signal to the pair of shutter glasses  910 . Therefore, a control chip in the pair of shutter glasses  910  is configured to select one of the operation modes according to the control signal to set the pair of shutter glasses  910 , such that the pair of shutter glasses  910  is suitable for watching image light output generated by the display apparatus  930 . In this exemplary embodiment, the control panel  902  shown in  FIG. 10  may be removed from the transmitter  900  without affecting the operation of the present invention. 
     In another exemplary embodiment of the present invention, after the transmitter  900  is initially connected to the display apparatus  930 , the display apparatus  930  actively transmits related information of the display apparatus (e.g. polarization direction of the image light) or a corresponding value (e.g. value=1) of the display apparatus to the transmitter  900 . Next, the transmitter  900  generates a control signal by searching the look-up table or using other manners according to the related information of the display apparatus or the corresponding value, and transmits the control signal to the pair of shutter glasses  910 . Therefore, the control chip in the pair of shutter glasses  910  is configured to select one of the operation modes according to the control signal to set the pair of shutter glasses  910 , such that the pair of shutter glasses  910  is suitable for watching image light output generated by the display apparatus  930 . In this exemplary embodiment, the control panel  902  shown in  FIG. 10  may be removed from the transmitter  900  without affecting the operation of the present invention. 
     In the aforementioned exemplary embodiments shown in  FIG. 9  and  FIG. 10 , the pair of shutter glasses  910  determines the operation mode according to the signal generated from the transmitter  900 . However, in other exemplary embodiments of the present invention, the user may control the operation mode directly and manually, i.e., the control applied to the operation mode of the pair of glasses is independent of the transmitter. Please refer to  FIG. 11 , which is a diagram illustrating a pair of shutter glasses  900  according to another exemplary embodiment of the present invention. As shown in  FIG. 11 , the pair of shutter glasses  910  includes a control panel  1102  having four operation modes TV-IPS, NB-TN, TV-VA and MNT-TN respectively for watching a television (TV) screen using an in-plane switching (IPS) LC panel, a notebook screen using a twist nematic (TN) LC panel, a TV screen using a vertical alignment (VA) LC panel, and a monitor using a TN LC panel. The control chip (not shown) in the pair of shutter glasses  910  is configured to select one of the operation modes according to a user input from the control panel  1102  to set the pair of shutter glasses  910 . Similarly, the control panel  1102  may also allow the user to manually control the driving manner of the pair of shutter glasses  910  (i.e., on/off switching modes such as on/off time lengths, on/off cycles, on/off times, on/off ratios, etc). Besides, it should be noted that the control panel  1102  mentioned above is for illustrative purposes only. In other exemplary embodiment of the present invention, the control panel may be any control panel which is capable of allowing the user to select an operation mode of the pair of shutter glasses  910 . 
     Please refer to  FIG. 12 , which is a diagram illustrating a control system  1200  for controlling a pair of shutter glasses  1210  according to an exemplary embodiment of the present invention. As shown in  FIG. 12 , the control system  1200  is disposed in a display apparatus  1230 , and the control system  1200  includes a transmitter  1204  and a control panel  1206 . Moreover, the pair of shutter glasses  1210  has a plurality of operation modes respectively corresponding to a plurality of types of display apparatuses. That is, the pair of shutter glasses  1210  may be the pair of shutter glasses  200  shown in  FIG. 2 , the pair of shutter glasses  500  shown in  FIG. 5 , the pair of shutter glasses  800  shown in  FIG. 8 , or any other pair of glasses capable of adjusting the polarization direction. Moreover, the control panel  1206  is an optional component, i.e., in some exemplary embodiments illustrated below, the control panel  1206  may be removed from the system  1200  without affecting the operation of the present invention. In the description below, only the operation modes respectively corresponding to a plurality of types of display apparatuses whose image light outputs have different polarization directions are illustrated. 
     Regarding the operation of the system  1200 , the transmitter  1204  may generate a control signal by searching the look-up table or using other manners according to a user input from the control panel  1206 , and the transmitter  1204  transmits the control signal to the pair of shutter glasses  1210  via infrared transmission, wireless transmission, ZigBee transmission, WiFi transmission, Bluetooth transmission, ultrawideband (UWB) transmission, DLP light signal transmission, etc. A control chip (not shown) in the pair of shutter glasses  1210  is configured to select one of the operation modes according to the information carried by the control signal to set the pair of shutter glasses  1210 , such that the pair of shutter glasses  1210  is suitable for viewing image light output generated by the display apparatus  1230 . 
     In another exemplary embodiment of the present invention, the display apparatus  1230  may display an on-screen display (OSD) shown in  FIG. 12  for allowing the user to determine how to set the operation mode of the pair of shutter glasses  1210 . If the user selects “auto setting” in the OSD, the display apparatus  1230  actively transmits related information of the display apparatus (e.g. polarization direction of image light) or a corresponding value of the display apparatus (e.g. value=1) to the transmitter  1204 . Next, the transmitter  1204  generates a control signal by searching the look-up table or using other manners according to the related information of the display apparatus or the corresponding value, and transmits the control signal to the pair of shutter glasses  1210 . In this way, the control chip in the pair of shutter glasses  1210  is configured to select one of the operation modes according to the control signal to set the pair of shutter glasses  1210 . If the user selects “manual switching mode” in the OSD, the OSD will further display more options for the user, meanwhile, the user may freely select one from the options that may allow the user to perceive image light with highest brightness via the pair of shutter glasses  1230  to act as a best operation mode of the pair of shutter glasses  1210 . In this exemplary embodiment, the control panel  1206  shown in  FIG. 12  may be removed from the system  1200  without affecting the operation of the present invention. 
     Besides, in another exemplary embodiment of the present invention, the designer may load a special wireless electronic signal (e.g., an infrared signal, a wireless signal, a ZigBee signal, a WiFi signal, a Bluetooth signal, a ultrawideband (UWB) signal, a DLP light signal, etc.) on the display apparatus  1230  in advance, and the transmitter  1204  may continuously transmit the special wireless electronic signal or transmit the specific wireless electronic signal only when the 3D mode is enabled or set. The pair of shutter glasses  1210  may directly receive the special wireless electronic signal and analyze it. For example, a control chip (not shown) in the pair of shutter glasses  1210  is configured to determine the type of the special wireless electronic signal (i.e., determine that the special wireless electronic signal belongs to which one of infrared signal, wireless signal, ZigBee signal, WiFi signal, Bluetooth signal, etc.) and identify the value carried by the special wireless electronic signal to recognize the type of the display apparatus (e.g., when the value is 1, it implies that the display apparatus is a TV screen, and when the value is 0, it implies that the display apparatus is a notebook screen), and select at least one of the on/off time lengths, on/off cycles, on/off times, on/off ratios for controlling the on/off manner applied to the shutter lenses of the pair of shutter glasses  1210 . 
     Please refer to  FIG. 13 , which is a flowchart illustrating a method for controlling a pair of shutter glasses according to an exemplary embodiment of the present invention. With reference to  FIG. 13 , the flow is detailed as below: 
     Step  1300 : Provide information of a display apparatus, wherein the information includes at least one of a type of the display apparatus, a product name of the display apparatus, a corresponding value of the display apparatus, and a polarization direction of image light output generated by the display apparatus. 
     Step  1302 : Transmit the information to the pair of glasses to set the pair of glasses. 
     Moreover, it should be noted that the content illustrated above is directed to adjusting a polarization direction for viewing images under a 3D mode. However, by utilizing this method (i.e., changing the polarization direction), the pair of glasses may also be utilized under a two-dimensional (2D) mode. That is, in a case where user&#39;s left eye and right eye both see the same left-eye image/right-eye image under a 2D mode, changing the polarization direction may be employed. 
     In brief conclusion of the present invention, the pair of shutter glasses of the present invention may select one of a plurality of operation modes according to a type of the display apparatus to set the pair of glasses, wherein the operation modes respectively correspond to a plurality of different types of display apparatuses. So, manufacturers do not have to redesign the pair of 3D glasses according to each display apparatus type, and the production cost is saved accordingly. Besides, one user only needs to buy one pair of 3D glasses suitable for viewing a plurality of types of display apparatuses, which prevents the user from spending extra money on buying the pair of shutter glasses. 
     Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention.