Patent Publication Number: US-9424789-B2

Title: Electronic imaging device and driving method therefor

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation application of U.S. patent application Ser. No. 13/188,326, filed Jul. 21, 2011, which in turn is a divisional application of U.S. Pat. No. 8,018,535, issued Sep. 13, 2011, which claims priority to and the benefit of Korean Patent Application No. 10-2007-0021137 filed in the Korean Intellectual Property Office on Mar. 2, 2007, the entire contents of all of which are incorporated herein by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an electronic imaging device, and more particularly, to an electronic imaging device capable of displaying stereoscopic images. 
     2. Description of the Related Art 
     In general, humans perceive a stereoscopic effect based on physiological and experiential factors, and three-dimensional image displaying technologies express a stereoscopic effect of an object by using binocular parallax, which is a key factor for allowing humans to recognize a stereoscopic effect at a short distance. 
     Typically, an electronic imaging device that displays stereoscopic images use a method in which left and right images are spatially separated by using an optical element so that a stereoscopic image can be seen. Typical methods include a method using a lenticular lens array and a method using a parallax barrier. 
     When displaying a stereoscopic image, a picture quality of the image may be degraded as compared with displaying a planar (or two-dimensional) image. This degradation may be reduced by using an electronic imaging device for displaying a stereoscopic image that can operate at a higher driving frequency as compared with an electronic imaging device for displaying (or only displaying) a planar (or two-dimensional) image. However, the operation at the higher driving frequency causes an increase in power consumption of the electronic imaging device, and despite the operation at the higher driving frequency, picture quality may still not be satisfactory. 
     The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. 
     SUMMARY OF THE INVENTION 
     Aspects of embodiments of the present invention are directed to an electronic imaging device and/or a driving method therefor for improving picture quality of a stereoscopic image and/or reducing power consumption. 
     An exemplary embodiment of the present invention provides an electronic imaging device including a display unit and a barrier layer. The display unit includes scan lines for transferring select signals, data lines for transferring data signals corresponding to first and second images formed according to one or more input signals, and pixels connected with the scan and data lines. The barrier layer includes first barriers and second barriers corresponding to the first barriers. The first image is displayed during a first period of a unit period during which an image of a single frame is displayed. The second image is displayed during a second period different from the first period. The first barriers are driven according to the first image, the second barriers are driven according to the second image, and a region of the barrier layer corresponding to a mixed region in which the first and second images coexist is a non-transmission region. 
     In one embodiment, the first barriers are driven in synchronization with when one of the select signals is transferred to one of a plurality of first scan lines of the plurality of scan lines, the first scan lines corresponding to the first barriers. Here, the first barriers may include a plurality of first electrodes corresponding to each of the plurality of first scan lines and a first connection electrode connected to the plurality of first electrodes. 
     In one embodiment, the second barriers are driven in synchronization with when one of the select signals is transferred to one of a plurality of first scan lines of the plurality of scan lines, the first scan lines corresponding to the second barriers. Here, the second barriers may include a plurality of first electrodes corresponding to each of the plurality of first scan lines and a first connection electrode connected to the plurality of first scan lines. 
     In one embodiment, the first barriers are driven in synchronization with when one of the select signals is transferred to one of a plurality of first scan lines of the plurality of scan lines during the first period, the first scan lines corresponding to the first barriers, and the second barriers corresponding to the first barriers are driven in synchronization with when the one of the select signals is transferred to the one of the plurality of first scan lines during the second period. Here, the first barriers may include a plurality of first electrodes corresponding to each of the plurality of first scan lines and a first connection electrode connected to the plurality of first electrodes, and the second barriers may include a plurality of second electrodes corresponding to each of the plurality of first scan lines and positioned parallel to each of the plurality of first electrodes. 
     In one embodiment, after the second image has been displayed, when a third image of another frame following the single frame is displayed, the two first barriers are driven according to the third image. 
     In one embodiment, the input signal includes a first view point image corresponding to a first view point and a second view point image corresponding to a second view point, and the first image is generated by combining the first and second view point images in the order of the first view point and the second view point, and the second image is generated by combining the first and second view point images in the order of the second view point and the first view point. Here, the first image may be displayed according to a scan direction in which one of the select signals is transferred to the plurality of scan lines during the first period, the second image may be displayed according to the scan direction during the second period, and the mixed region may be a region in which the first and second images coexist as the second image starts to be displayed according to the scan direction after the first image has been displayed. 
     In one embodiment, each of the pixels includes an organic light emitting element. 
     In one embodiment, each of the pixels includes a liquid crystal layer. 
     Another embodiment of the present invention provides a method for driving an electronic imaging device that displays a stereoscopic image according to an input signal. The method includes combining first and second images according to at least one input signal; sequentially driving a plurality of first barriers during a period during which the first image is displayed; sequentially driving a plurality of second barriers during a period during which the second image is displayed; and rendering one of the plurality of first barriers and one of the plurality of second barriers that correspond to a region in which the first and second images coexist as the second image starts to be displayed after the first image has been displayed to become a non-transmission region. 
     In one embodiment, the sequentially driving the plurality of first barriers includes transferring a plurality of select signals according to a direction in which the first image is displayed and driving the first barriers in synchronization with one of a plurality of corresponding first select signals of the plurality of select signals. 
     In one embodiment, the sequentially driving the plurality of second barriers includes transferring a plurality of select signals according to a direction in which the second image is displayed and driving the second barriers in synchronization with one of a plurality of corresponding first select signals of the plurality of select signals. 
     In one embodiment, in the rendering of the one of the plurality of first barriers and the one of the plurality of second barriers to become the non-transmission region, when the second image starts to be displayed after the first image has been displayed, the one of the first barriers and the one of the second barriers corresponding to a region in which the first and second images coexist is changed to become the non-transmission region. 
     Another exemplary embodiment of the present invention provides an electronic imaging device including a display unit and a barrier layer. The display unit includes a plurality of scan lines for transferring a plurality of select signals, a plurality of data lines for transferring a plurality of data signals corresponding to a first image and a second image of a single frame, the first and second images being formed according to at least one input signal, and a plurality of pixels connected with the scan lines and the data lines. The barrier layer includes a plurality of first barriers and a plurality of second barriers corresponding to the first barriers. The single frame is time divided into a first period and a second period differing from the first period. The first image is displayed during the first period. The second image is displayed during the second period. The first barriers are driven according to the first image, the second barriers are driven according to the second image, and a region of the barrier layer corresponding to where the first and second images coexist is a non-transmission region. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  schematically illustrates an electronic imaging device according to an exemplary embodiment of the present invention. 
         FIG. 2  schematically illustrates a structure of a pixel circuit according to an exemplary embodiment of the present invention. 
         FIG. 3  schematically illustrates a time division driving method of a planar/stereoscopic image display device according to an exemplary embodiment of the present invention. 
         FIG. 4  schematically illustrates a barrier driver and a barrier layer according to an exemplary embodiment of the present invention. 
         FIG. 5  schematically illustrates a display unit divided into four regions according to an exemplary embodiment of the present invention. 
         FIG. 6  schematically illustrates a process of displaying a first image during a first period and a second image during a second period on a display unit according to an exemplary embodiment of the present invention. 
         FIG. 7  schematically illustrates barrier drive signals transferred to four first barriers and four second barriers from a barrier driver according to an exemplary embodiment of the present invention. 
         FIG. 8  schematically illustrates an electronic imaging device according to another exemplary embodiment of the present invention. 
         FIG. 9  schematically illustrates the structure of a pixel circuit according to another exemplary embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     In the following detailed description, only certain exemplary embodiments of the present invention have been shown and described, simply by way of illustration. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate like elements throughout the specification. 
     Throughout this specification and the claims that follow, when it is described that a first element is “coupled” or “connected” to a second element, the first element may be “directly coupled” or “directly connected” to the second element or be “electrically coupled” or “electrically connected” to the second element through one or more other elements. In addition, unless explicitly described to the contrary, the word “comprise”, and variations such as “comprises” and “comprising”, will be understood to imply the inclusion of stated elements but not the exclusion of any other elements. 
     The electronic imaging device and its driving method according to exemplary embodiments of the present invention will now be described in more detail below. 
       FIG. 1  schematically shows an electronic imaging device according to an exemplary embodiment of the present invention. 
     As shown in  FIG. 1 , the electronic imaging device according to one embodiment of the present invention is an imaging device that can selectively display a planar image and a stereoscopic image, and includes a display unit (or display region)  100 , a barrier layer  150 , a scan driver  200 , a data driver  300 , a controller  400 , and a barrier driver  500 . 
     The display unit  100  includes a plurality of scan lines S1˜Sn (S1, S2, . . . , Si, . . . , Sn−1, Sn) that transfer select signals, a plurality of data lines D1˜Dm (D1, D2, . . . , Dj, . . . , Dm−1, Dm) that are formed to be insulated from and to cross the plurality of scan lines S1˜Sn and that transfer data signals, and a plurality of pixels  105  formed at crossings of the scan lines and the data lines. In the present exemplary embodiment, it is assumed that a red sub-pixel that displays red (R) color, a green sub-pixel that displays green (G) color, and a blue sub-pixel that displays blue (B) color form a single pixel. Also, in the present exemplary embodiment, the plurality of pixels  105  of the display unit  100  are divided into pixels corresponding to a left-eye image (hereinafter, also referred to as ‘left-eye pixels’), and pixels corresponding to a right-eye image (hereinafter, also referred to as ‘right-eye pixels’). The left-eye pixels and the right eye pixels are formed to be alternately and/or repeatedly arranged. In more detail, the left-eye pixels and the right eye-pixels are alternately and/or repeatedly arranged in parallel with each other to have a stripe pattern and/or a zigzag pattern. The left-eye pixels and the right-eye pixels can be suitably changed (or varied) according to a structure of the barrier layer  150 . According to the present exemplary embodiment, pixels  105  of the display unit  100  may include one or more organic light emitting diodes (OLEDs) and one or more pixel circuits required for driving the one or more OLEDs. 
       FIG. 2  schematically illustrates a structure of a pixel circuit of a pixel according to one exemplary embodiment of the present invention. 
     In one embodiment and referring to  FIG. 2 , a pixel circuit of a pixel  105  includes a driving transistor M 1 , a switching transistor M 2 , a capacitive element (capacitor) C 1 , and an OLED. The OLED has diode characteristics, and has a structure that includes an anode electrode layer (anode), an organic thin film, and a cathode electrode layer (cathode). 
     A pixel circuit is arranged (or positioned) at each crossing of one of the plurality of scan lines (Si) and one of the plurality of data lines (Dj), and is connected to the one of the scan lines (Si) and the one of the data lines (Dj). The driving transistor M 1  generates a driving current in response to a voltage applied to its gate electrode and its source electrode. The switching transistor M 2  is turned on in response to a select signal transferred from the scan line Si, and when the switching transistor M 2  is turned on, a data signal transferred from the data line Dj is transferred to the gate electrode of the driving transistor M 1 . The capacitive element C 1  has first and second ends respectively connected to the gate electrode and the source electrode of the driving transistor M 1 , and uniformly maintains voltages of the first and second ends. The driving transistor M 1  generates a driving current IOLED corresponding to a difference between the voltage of the data signal transferred to the gate electrode of the driving transistor M 1  and a power source voltage VDD applied to the source electrode of the driving transistor M 1 . The thusly generated driving current IOLED flows to the OLED through a drain electrode of the driving transistor M 1 . The OLED emits light corresponding to the driving current IOLED. 
     The scan driver  200  is connected with the scan lines S1˜Sn of the display unit  100  and applies select signals formed of a combination of a gate ON voltage and a gate OFF voltage to the scan lines S1˜Sn. The scan driver  200  may apply the select signals to the plurality of scan lines S1˜Sn such that the select signals have the gate ON voltage sequentially. When the select signals have the gate ON voltage, a switching transistor of a pixel circuit connected with a corresponding scan line is turned on. 
     The data driver  300  is connected with the data lines D1˜Dm of the display unit  100  and applies data signals each representing a gray level to the data lines D1˜Dm. The data driver  300  converts input image data DR, DG, and DB, which are input from the controller  400  and have gray level information, into the data signals in the form of voltage or current. 
     The controller  400  receives an input signal IS, a horizontal synchronization signal Hsync, and a vertical synchronization signal Vsync from one or more external sources, generates a scan control signal CONT1, a data control signal CONT2, the image data DR, DG, and DB, and a barrier driver control signal CONT3, and transfers them respectively to the data driver  300 , the scan driver  200 , the data driver  300 , and the barrier driver  500 . The scan control signal CONT1 includes a scan start signal for indicating the start of scanning and a first clock signal. In the present exemplary embodiment, the scan start signal is a signal that controls a point of time at which an image of a single frame starts to be displayed on the display unit in synchronization with the vertical synchronization signal for indicating the start of transferring of image data of the single frame, and the first clock signal is a signal that controls a point of time at which select signals are transferred to each of the plurality of scan lines S1˜Sn in synchronization with the horizontal synchronization signal for indicating transferring of the input image data with respect to pixels of a single row. The data signal control CONT2 includes a second clock signal having a certain period in synchronization with the horizontal synchronization signal and a horizontal synchronization start signal that controls the start of the transfer of the data signal, etc. In transferring the input image data corresponding to the pixels of a single row to the data driver  300 , the controller  400  may transfer the input image data DR, DG, and DB through three channels by color or may sequentially transfer the input image data DR, DG, and DB through a single channel. 
     Here, the input signal IS input to the controller  400  may be planar (or two-dimensional data (2D)) image data, three-dimensional (3D) graphic data to be displayed in three dimensions on a planar surface by including three-dimensional spatial coordinates and surface information of an object, and stereoscopic image data including time-point image data, and when a planar image and a stereoscopic image are displayed together on the display unit  100 , they may include all the planar image data and stereoscopic image data. When the input signal is stereoscopic image data, the controller  400  transfers the barrier driver control signal CONT3 to the barrier driver  500  in order to control a plurality of barriers constituting the barrier layer  150 . The controller generates the barrier driver control signal CONT3 in order to drive the barrier layer  150  according to a select signal transferred to the plurality of scan lines S1˜Sn. In more detail, in the present exemplary embodiment, when the barrier layer  150  is divided into a plurality of barriers, the barriers are controlled to be operated in synchronization with a point of time at which a select signal is transferred to one of the plurality of scan lines corresponding to one of the barriers. When the scan driver  200  transfers a select signal to each of the plurality of scan lines according to the first clock signal, the controller  400  detects a scan line to which the select signal is applied among the scan lines corresponding to the plurality of barriers. The controller  400  generates the barrier driver control signal so that the barriers can be operated in synchronization with a point of time when an arbitrary select signal is transferred to the plurality of scan lines corresponding to the plurality of barriers. Then, the barrier driver drives the barriers or stops their operation according to the barrier driver control signal. 
     The barrier driver  500  generates a plurality of barrier drive signals CB and transfers them to the barrier layer  150  in order to control the plurality of barriers of the barrier layer  150 . The barrier driver  500  and the barrier layer  150  will be described in more detail below. 
     First, a time division driving method according to an present exemplary embodiment will be described with reference to  FIG. 3 . 
       FIG. 3  schematically illustrates a time division driving method of a planar/stereoscopic image display device according to an exemplary embodiment of the present invention. 
     The time division driving method may include: 1) a method in which a light source is alternately operated at left and right sides, and the left and right sides are divided according to a time division by using an optical element including a combination of a prism and a lenticular lens; or 2) a method in which a slit, through which light passes, in a liquid crystal barrier is divided into several sections and the divided slit sections are moved in synchronization with a displayed image. The electronic imaging device according to the exemplary embodiment of the present invention is driven according to method 2). However, the present invention is not limited thereto, and when method 1) is used, an optical element including a combination of a light source, the prism, and the lenticular lens, instead of the liquid crystal barrier, can be used.  FIG. 3  shows a case of two eyes (e.g., two eyes of one viewer), but the present invention is not limited thereto, and the same (or substantially the same) principle can be applied for a case of multiple viewers with multiple eyes. 
     First,  FIG. 3  shows that an image obtained by combining the left and right sides at a first period T 1  is directed or projected to (or seen by a left eye and a right eye of) a user when driving is performed utilizing time division of one frame into the first and second periods T 1  and T 2 .  FIG. 3  also shows that an image obtained by combining the right and left sides at the second period T 2  is directed or projected to (or seen by the left eye and the right eye of) the user. 
     In the first period T 1 , an odd pixel OP of the display unit  100  is a left-eye pixel and an even pixel EP is a right-eye pixel. An odd pixel BOP of the barrier layer  150  is a non-transmission region and an even pixel BEP of the barrier layer  150  is a transmission region. In the first period T 1 , there are formed a path through which a left-eye image is projected to the left eye and a path through which a right-eye image is projected to the right eye. The left-eye image projected from the odd pixel OP is formed as an image having a certain disparity with respect to the right-eye image, and the right-eye image projected from the even pixel EP is formed as an image having a certain disparity with respect to the left-eye image. Accordingly, when the user recognizes the left-eye image projected from the odd pixel OP and the right-eye image projected from the even pixel EP with his/her left and right eyes, he/she obtains depth information as if he/she were looking at an actual solid target through his/her left and right eyes, thereby perceiving a stereoscopic effect. 
     In the second period T 2 , the odd pixel OP of the display unit  100  is the right-eye pixel and the even pixel EP of the display unit  100  is the left-eye pixel. The odd pixel BOP of the barrier layer  150  is a transmission region and the even pixel BEP of the barrier layer  150  is a non-transmission region. In the second period T 2 , there are formed a path through which a left-eye image is projected to the user&#39;s left eye and a path through which a right-eye image is projected to the user&#39;s right eye. The right-eye image projected from the odd pixel OP is formed as an image having a certain disparity with respect to the left-eye image, and the left-eye image projected from the even pixel EP is formed as an image having a certain disparity with respect to the right-eye image. Accordingly, when the user recognizes the right-eye image projected from the odd pixel OP and the left-eye image projected from the even pixel EP with his/her left and right eyes, he/she obtains depth information as if he/she were looking at an actual solid target through his/her left and right eyes, thereby perceiving a stereoscopic effect. 
     In this manner, during the period T 1 , the odd pixel is seen by a user&#39;s left eye while the even pixel is seen by a user&#39;s right eye, and during the period T 2 , the odd pixel is seen by a user&#39;s right eye while the even pixel is seen by a user&#39;s left eye. Accordingly, the user can watch the stereoscopic image with the same resolution as that of a planar image. However, because an image is displayed according to a scan direction in which the select signals are transferred to the plurality of scan lines S1˜Sn, when a right and left image in which right-eye and left-eye images are combined is displayed during the second period T 2  after a left and right image in which left-eye and right-eye images are combined has been displayed during the first period T 1 , a region where the left and right image and the right and left image are mixed is displayed on the display unit  100 . 
       FIG. 4  illustrates the barrier driver  500  and the barrier layer  150  according to an exemplary embodiment of the present invention. 
       FIG. 5  illustrates the display unit  100  divided into four regions (R 1 , R 2 , R 3 , and R 4 ) in order to explain a corresponding relationship between the display unit  100  and the barrier layer  150  according to the exemplary embodiment of the present invention. In the present exemplary embodiment, the barrier layer  150  is divided into four regions. Also, in each region of the barrier layer  150 , one of four first barriers  150 _ 11 ,  150 _ 12 ,  150 _ 13 , and  150 _ 14  and one of four second barriers  150 _ 21 ,  150 _ 22 ,  150 _ 23 , and  150 _ 24  make a pair, but the present invention is not limited thereto. In the electronic imaging device according to the exemplary embodiment of the present invention, the barrier layer  150  can be divided into at least two regions and be operated with the at least two regions. 
     As shown in  FIG. 4 , the barrier layer  150  includes the plurality of first barriers  150 _ 11 ,  150 _ 12 ,  150 _ 13 , and  150 _ 14 , and the plurality of second barriers  150 _ 21 ,  150 _ 22 ,  150 _ 23 , and  150 _ 24 . The first barrier  150 _ 11  and the second barrier  150 _ 21  are positioned to correspond to the first region R 1  of the display unit  100 . The first barrier  150 _ 12  and the second barrier  150 _ 22  are positioned to correspond to the second region R 2 . The first barrier  150 _ 13  and the second barrier  150 _ 23  are positioned to correspond to the third region R 3 . The first barrier  150 _ 14  and the second barrier  150 _ 24  are positioned to correspond to the fourth region R 4 . The first and second barriers positioned at the same region are operated according to time division driving. In more detail, when a first image in which the left-eye image and the right-eye image are combined and a second image in which the right-eye image and the left-eye image are combined are alternately displayed during a single frame period in order to display an image of the single frame, if the first image is displayed, the plurality of first barriers  150 _ 11 ,  150 _ 12 ,  150 _ 13 , and  150 _ 14  are driven, and if the second image is displayed, the plurality of second barriers  150 _ 21 ,  150 _ 22 ,  150 _ 23 , and  150 _ 24  are driven. Then, the barrier layer  150  is operated during the first period T 1  and the second period T 2 , as described above with reference to  FIG. 3 . Here, the barrier layer is operated by the pluralities of first and second barriers. Namely, the first and second barriers of the same region are operated in synchronization with a point of time when a select signal is transferred to one of the plurality of scan lines of the display unit corresponding to the region of the first and second barriers. The description therefore will be described in more detail below with reference to  FIG. 6 . 
     The barrier driver  500  drives a plurality of barrier drive signals CB 11 , CB 12 , CB 13 , and CB 14  (CB 11 -CB 14 ) and CB 21 , CB 22 , CB 23 , and CB 24  (CB 21 -CB 24 ) at each of the plurality of first barriers  150 _ 11 ,  150 _ 12 ,  150 _ 13 , and  150 _ 14  and the plurality of second barriers  15021 ,  150 _ 22 ,  150 _ 23 , and  150 _ 24  according to a barrier driver control signal. In the exemplary embodiment of the present invention, the barrier drive signals CB 11 -CB 14  and CB 21 -CB 24  have voltages with a level suitable for driving the plurality of first barriers  150 _ 11 ,  150 _ 12 ,  150 _ 13 , and  150 _ 14  and the plurality of second barriers  150 _ 21 ,  15022 ,  150 _ 23 , and  150 _ 24 . 
     The operation will be described in more detail with reference to  FIGS. 6 and 7 . 
       FIG. 6  illustrates a process of displaying the first image during the first period T 1  and the second image during the second period T 2  on the display unit  100  according to the exemplary embodiment of the present invention. Namely,  FIG. 6  shows the images displayed according to the regions of the display unit  100  and the barrier layer  150 , and a state of the barrier layer  150 , according to the lapse of time. 
       FIG. 7  illustrates barrier drive signals transferred to the four first barriers  150 _ 11 ,  150 _ 12 ,  150 _ 13 , and  150 _ 14  and the four second barriers  150 _ 21 ,  150 _ 22 ,  150 _ 23 , and  150 _ 24  from the barrier driver  500  according to the exemplary embodiment of the present invention. In an embodiment of the present invention, if the barrier layer  150  is normally black, it can become a non-transmission region if a driving voltage is not applied to the four first barriers  150 _ 11 ,  150 _ 12 ,  150 _ 13 , and  150 _ 14  and to the four second barriers  150 _ 21 ,  150 _ 22 ,  150 _ 23 , and  150 _ 24 . In another embodiment, if the barrier layer is normally white, it can become a non-transmission region if a driving voltage is applied to the four first barriers  150 _ 11 ,  150 _ 12 ,  150 _ 13 , and  150 _ 14  and to the four second barriers  150 _ 21 ,  150 _ 22 ,  150 _ 23 , and  150 _ 24 . The description herein will be limited to the exemplary case where the four first barriers and the four second barriers are normally white. Accordingly, in the exemplary embodiment of the present invention, the barrier drive signals CB 11 -CB 14  and CB 21 -CB 24  alternately have a barrier driving ON voltage VH and a barrier driving OFF voltage VL. 
     First, immediately before a point of time (S) at which a first image starts to be displayed, a right and left image  2 ′, in which a right-eye image and a left-eye image are combined, of an immediately previous frame to a current frame is displayed on the entire screen. When a left and right image  1 , in which a left-eye image and a right-eye image of the current frame are combined, starts to be output to the display unit, the left and right image  1  starts to be displayed at the plurality of scan lines according to a scan direction of the display unit. Hereinafter, it may be assumed that an overall time during which the right and left image  2 ′ is changed to the left and right image  1  is T 1 . In the exemplary embodiment of the present invention, as shown in  FIGS. 4 and 5 , the barrier layer  150  is divided into four regions, each region including a pair of first and second barriers, and accordingly, the display unit  100  is also divided into four regions (R 1  to R 4  in  FIG. 5 ). The four first barriers and the four second barriers are driven in synchronization with a point of time when one of a plurality of select signals is transferred to the respective regions R 1  to R 4  of the display unit  100 . During the period T 1  in  FIG. 3 , the four first barriers  150 _ 11 ,  150 _ 12 ,  150 _ 13 , and  150 _ 14  corresponding to the left and right image of the current frame are synchronized to be sequentially driven. During the period T 2 , the four second barriers  150 _ 21 ,  150 _ 22 ,  150 _ 23 , and  150 _ 24  corresponding to the right and left image of the current frame are synchronized to be sequentially driven. Here, the first and second barriers of a region in which the right and left image and the left and right image are mixed are driven to become a non-transmission region. 
     More specifically, first, during a period T 11 , e.g., a first quarter of the period T 1 , during which the right and left image  2 ′ starts to be changed to the left and right image  1 , the left and right image  1  is displayed on the one-fourth region R 1  of the display unit  100  according to the scan direction while the right and left image  2 ′ remains on the three-fourths region R 2  to R 4 . Here, the left and right image  1  and the right and left image  2 ′ coexist on the one-fourth region R 1 . The mixture (coexistence) of the image of the current frame and that of the immediately previous frame degrades the picture quality. Thus, in order to reduce or prevent this mixture (coexistence), the portion corresponding to a region (C) of the barrier layer  150  is driven as a non-transmission region. Namely, the barrier drive signals CB 11  and CB 21  have the barrier driving ON voltage VH. Then, the image at the one-fourth region R 1  of the display unit  100  can be rejected. The barrier drive signals CB 22 , CB 23 , and CB 24  have the barrier driving ON voltage VH, and the three second barriers  150 _ 22 ,  150 _ 23 , and  150 _ 24  of the remaining three-fourths region (A) of the barrier layer  150  are driven according to the barrier drive signals CB 22 , CB 23 , and CB 24 , and so the right and left image  2 ′ is displayed as a stereoscopic image on the three-fourths region R 2  to R 4 . 
     During the next period T 12 , the left and right image  1  is displayed on the two-fourths region R 1  and R 2  of the display unit according to the scan direction, while the right and left image  2 ′ remains on the remaining two-fourths region R 3  and R 4 . Here, the left and right image  1  and the right and left image  2 ′ coexist on the region R 2 . Thus, the portion corresponding to a region (C) of the barrier layer  150  is driven as a non-transmission region. Namely, the barrier drive signals CB 12  and CB 22  have the barrier driving ON voltage VH. Then, the image of the region R 2  of the display unit  100  is rejected. The barrier drive signals CB 11 , CB 23 , and CB 24  have the barrier driving ON voltage VH, and the two second barriers  150 _ 23  and  150 _ 24  of the region (A) of the barrier layer  150  and the first barrier  150 _ 11  of a region (B) are driven according to the barrier drive signals CB 11 , CB 23 , and CB 24 , and so the left and right image  1  is displayed as a stereoscopic image on the region R 1  while the right and left image  2 ′ is displayed as a stereoscopic image on the regions R 3  and R 4 . 
     During the next period T 13 , the left and right image  1  is displayed on the three-fourths region R 1  to R 3  of the display unit according to the scan direction, while the right and left image  2 ′ remains on the remaining one-fourth region R 4 . Here, the left and right image  1  and the right and left image  2 ′ coexist on the region R 3 . Thus, the portion corresponding to a region (C) of the barrier layer  150  is driven as a non-transmission region. Namely, the barrier drive signals CB 13  and CB 23  have the barrier driving ON voltage VH. Then, the image of the region R 3  of the display unit  100  is rejected. The barrier drive signals CB 11 , CB 12 , and CB 24  have the barrier driving ON voltage VH, and the second barrier  150 _ 24  of the region (A) of the barrier layer  150  and the two first barriers  150 _ 11  and  150 _ 12  of the region (B) are driven according to the barrier drive signals CB 11 , CB 12 , and CB 24 , and so the left and right image  1  is displayed as a stereoscopic image on the regions R 1  and R 2  while the right and left image  2 ′ is displayed as a stereoscopic image on the one-fourth region R 4 . 
     During the next period T 14 , the left and right image  1  is displayed on the entire region R 1  to R 4  of the display unit  100  according to the scan direction. Here, the left and right image  1  and the right and left image  2 ′ coexist on the region R 4 . Thus, the portion corresponding to the region (C) of the barrier layer  150  is driven as a non-transmission region. Namely, the barrier drive signals CB 14  and CB 24  have the barrier driving ON voltage VH. Then, the image of the region R 4  of the display unit  100  is rejected. The barrier drive signals CB 11 , CB 12 , and CB 13  have the barrier driving ON voltage VH, and the three first barriers  150 _ 11 ,  150 _ 12 , and  150 _ 13  of the region (B) of the barrier layer  150  are driven according to the barrier drive signals CB 11 , CB 12 , and CB 13 , and so the left and right image  1  is displayed as a stereoscopic image on the three-fourths region R 1  to R 3 . 
     The operation during the second period T 2  will now be described below in more detail. 
     First, during a period T 21 , e.g., a first quarter of the period T 2 , during which the left-right image  1  starts to be changed to a right and left image  2 , the right and left image  2  is displayed on the one-fourth region R 1  of the display unit according to a scan direction, while the left and right image  1  remains on the three-fourths region R 2  to R 4 . Here, the left and right image  1  and the right and left image  2  coexist on the one-fourth region R 1 . The mixture (coexistence) of the left and right image and the right and left image of the current frame degrades the picture quality. Thus, in order to reduce or prevent this mixture (coexistence), the barrier drive signals CB 11  and CB 21  have the barrier driving ON voltage VH, and the first barrier  150 _ 11  and the second barrier  150 _ 21  are driven according to the barrier drive signals CB 11  and CB 21 , and so the portion corresponding to the region (C) of the barrier layer  150  is formed as a non-transmission region. Then, the image of the region R 1  of the display unit is rejected. The barrier drive signals CB 12 , CB 13 , and CB 14  have the barrier driving ON voltage VH, and the three first barriers  150 _ 12 ,  150 _ 13 , and  150 _ 14  of the region (B) of the barrier layer  150  are driven according to the barrier drive signals CB 12 , CB 13 , and CB 14 , and so the left and right image  1  is displayed as a stereoscopic image on the three-fourths region R 2  to R 4 . 
     During the next period T 22 , the right and left image  2  is displayed on the two-fourths region R 1  and R 2  of the display unit  100  according to the scan direction, while the left and right image  1  remains on the remaining two-fourths region R 3  and R 4 . Here, the left and right image  1  and the right and left image  2  coexist on the region R 2 . The barrier drive signals CB 12  and CB 22  have the barrier driving ON voltage VH, and the first barrier  150 _ 12  and the second barrier  150 _ 22  are driven according to the barrier drive signals CB 12  and CB 22 , and so the portion corresponding to the region (C) of the barrier layer  150  is formed as a non-transmission region. Then, the image of the region R 2  of the display unit  100  is rejected. Here, the barrier drive signals CB 21 , CB 13 , and CB 14  have the barrier driving ON voltage VH. The second barrier  150 _ 21  corresponding to a region (A′) of the barrier layer  150  is driven according to the barrier drive signal CB 21 , while the two second barrier  150 _ 13  and  150 _ 14  of the region (B) are driven according to the barrier drive signals CB 13  and CB 14 . Then, the right and left image  2  is displayed as a stereoscopic image on the one-fourth region R 1  of the display unit  100 , while the left and right image  1  is displayed as a stereoscopic image on the three-fourths region R 3  and R 4 . 
     During the next period T 23 , the right and left image  2  is displayed on the three-fourths region R 1  to R 3  of the display unit  100  according to the scan direction, while the left and right image  1  remains on the remaining one-fourth region R 4 . Here, the left and right image  1  and the right and left image  2  coexist on the region R 3 . The barrier drive signals CB 13  and CB 23  have the barrier driving ON voltage VH, and the first barrier  150 _ 13  and the second barrier  150 _ 23  are driven according to the barrier drive signals CB 12  and CB 22 , and so the portion corresponding to the region (C) of the barrier layer  150  is formed as a non-transmission region. Then, the image of the region R 3  of the display unit is rejected. Here, the barrier drive signals CB 21 , CB 22 , and CB 14  have the barrier driving ON voltage VH. The first barrier  150 _ 14  corresponding to the region (B) of the barrier layer  150  is driven according to the barrier drive signal CB 14 , and so the left and right image  1  is displayed as a stereoscopic image on the one-fourth region R 4 . The second barriers  150 _ 21  and  150 _ 22  corresponding to the region (A′) of the barrier layer  150  are driven according to the barrier drive signals CB 21  and CB 22 , so the right and left image  2  is displayed as a stereoscopic image on the two-fourths region R 1  and R 2  of the display unit  100 . 
     During the next period T 24 , the right and left image  2  is displayed on the entire region R 1  to R 4  of the display unit  100  according to the scan direction. Here, the left and right image  1  and the right and left image  2  coexist on the region R 4 . The barrier drive signals CB 14  and CB 24  have the barrier driving ON voltage VH, and the first barrier  150 _ 14  and the second barrier  150 _ 24  are driven according to the barrier drive signals CB 14  and CB 24 , and so the portion corresponding to the region (C) of the barrier layer  150  is formed as a non-transmission region. Then, the image of the region R 4  of the display unit is rejected. Here, the barrier drive signals CB 21 , CB 22 , and CB 23  have the barrier driving ON voltage, and the three first barriers  150 _ 21 ,  150 _ 22 , and  150 _ 23  of the region (A′) of the barrier layer  150  are driven according to the barrier drive signals CB 21 , CB 22 , and CB 23 . Then, the right and left image  2  is displayed as a stereoscopic image on the three-fourths region R 1  to R 3 . 
     As mentioned above, the non-transmission regions are formed by simultaneously driving the pairs of first and second barriers. Thus, if it is assumed that the barrier drive signals alternately have the barrier driving ON voltage VH and the barrier driving OFF voltage VL, they can be illustrated as shown in  FIG. 7 . 
     As shown in  FIG. 7 , during the period T 11 , the barrier drive signal CB_ 11  and the barrier drive signals CB_ 21 , CB 22 , CB 23 , and CB 24  have the barrier driving ON voltage. 
     During the period T 12 , the barrier drive signals CB 11  and CB 12  and the barrier drive signals CB 22 , CB 23 , and CB 24  have the barrier driving ON voltage. During the period T 13 , the barrier drive signals CB 11 , CB 12 , and CB 13  and the barrier drive signals CB 23  and CB 24  have the barrier driving ON voltage. During the period T 14 , the barrier drive signals CB 11 , CB 12 , CB 13 , and CB 14  and the barrier drive signals CB 24  have the barrier driving ON voltage. 
     As stated above, the electronic imaging device according to the exemplary embodiment of the present invention displays stereoscopic images according to a time-division driving method, in which the displaying of a region in which the left and right image and the right and left image are mixed can be prevented. In addition, in the electronic imaging device according to the exemplary embodiment of the present invention, the driving frequency and power consumption can be reduced as compared with known devices not driven according to the exemplary embodiment of the present invention. 
       FIG. 8  schematically illustrates an electronic imaging device according to another exemplary embodiment of the present invention. 
     As shown in  FIG. 8 , the electronic imaging device according to another exemplary embodiment of the present invention includes a display unit (or display region)  100 ′ that displays an image by using a liquid crystal layer, a light source  110 , and a light source controller  600  in addition to the elements of the former exemplary embodiment of the present invention. The display unit  100 ′ includes a plurality of scan lines S1′˜S′n (S1′, S2′, . . . , S′i, . . . , S′n−1, S′n) that transfer select signals, a plurality of data lines D′1˜D′m (D′1, D′2, . . . , D′j, . . . , D′m−1, D′m) that transfer data signals and a plurality of pixels  105 ′ that display an image by using the liquid crystal layer. The barrier layer  150  according to the current exemplary embodiment of the present invention is operated in the same manner (or substantially the same manner) as in the previously described exemplary embodiment(s) of the present invention. 
       FIG. 9  schematically illustrates the structure of a pixel circuit according to another exemplary embodiment of the present invention. 
     As shown in  FIG. 9 , a pixel circuit of a pixel  105 ′ includes a switching element Q, a liquid crystal layer Ccl, and a storage capacitor Cst. The switching element Q is turned on in response to a select signal transferred by a scan line Si′. In the current exemplary embodiment of the present invention, as the switching element Q, a p-type transistor is used. When the switching element Q is turned on by a select signal with a sufficiently (or suitably) low level, a data signal of the data line Dj′ is transferred through the turned-on switching element Q and the liquid crystal layer is driven according to a voltage difference between the voltage of the data signal and a common voltage Vc to refract light transferred from the light source  110 . Here, the storage capacitor Cst maintains a uniform voltage difference between both ends of the liquid crystal layer Ccl. 
     In one embodiment, the light source  110  includes red (R), green (G), and blue (B) light emitting diodes (LEDs), and outputs light rays corresponding to red (R), green (G), and blue (B) colors to the display unit  100 ′. In more detail, the red (R), green (G), and blue LEDs of the light source  110  output lights to R, G, and B sub-pixels of the display unit  100 ′, respectively. 
     The light source controller  600  controls a lighting time of the LEDs of the light source  110  in response to a control signal SL. Here, a period during which an analog data voltage is supplied from the data driver  300  to data lines and a period during which the R, G, and B LEDs are turned on by the light source controller  600  can be synchronized by a control signal provided by the controller  400 . 
     The electronic imaging device including the liquid crystal layer and its driving method according to the current exemplary embodiment of the present invention can reduce the driving frequency and power consumption in the time division driving, compared with known devices. 
     The exemplary embodiments of the present invention can provide an electronic imaging device and a driving method therefor that can display a stereoscopic image according to a time division driving method and reduce the driving frequency. 
     Therefore, the electronic imaging device and the driving method can reduce power consumption. 
     While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims, and equivalents thereof.