Patent Publication Number: US-2015085090-A1

Title: Three-dimensional display device and three-dimensional display method thereof

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to the field of displaying techniques, and in particular to a three-dimensional display device and three-dimensional display method thereof. 
     2. The Related Arts 
     The shutter glass technique of three-dimensional (3D) display device in general suffers a problem of cross-talk. To solve the problem, the known technique is to utilize a technique called black insertion, i.e., backlight unit (BLU) blinking mode, which is realized by inserting a black image at the switching of right-eye and left-eye signals. For example, at the end of the right-eye frame, a black image is inserted, followed by the scanning of the left-eye frame. However, the black insertion technique has a fixed insertion time and the duration of the black image; in other words, the 3D display luminance and the cross-talk problem are also fixed. 
     As the development of the display panel technology, the viewer demands versatile in display panel quality. For 3D technology, the higher luminance and the lower cross-talk in 3D mode are both important parameters to the viewers. However, the different viewers may demand different 3D display luminance and 3D cross-talk. Thus, the known black insertion technique is unable to meet the demands of the viewers. 
     SUMMARY OF THE INVENTION 
     The technical issue to be addressed by the present invention is to provide a 3D display device and 3D display method thereof, able to adjust the insertion time of the black image to obtain different 3D display quality based on the viewing demands to improve viewing experience. 
     The present invention provides a 3D display method, applicable to a 3D display device, the method comprising: providing a first signal to the 3D display device sequentially for providing left-eye image and right-eye image sequentially: providing a second signal at the time of switching the left-eye image and the right-eye image for inserting a black image; wherein the period of the left-eye image and the right-eye image being t1, the second signal being provided at a time greater than 1/2t1, inserting the black image to obtain higher 3D luminance; or, the second signal being provided at a time smaller than 1/2t1 inserting the black image to obtain lower 3D cross-talk. 
     According to a preferred embodiment of the present invention, to obtain a higher 3D display luminance, the insertion time of the black image is postponed later. 
     According to a preferred embodiment of the present invention, to obtain a lower 3d cross-talk, the insertion time of the black image is advanced earlier. 
     The present invention provides a 3D display method, applicable to a 3D display device, the method comprising: providing a first signal to the 3D display device sequentially for providing left-eye image and right-eye image sequentially; providing a second signal at the time of switching the left-eye image and the right-eye image for inserting a black image; wherein different 3D display quality being obtained through adjusting the insertion time of the black image. 
     According to a preferred embodiment of the present invention, the period of the left-eye image and the right-eye image is t1, and the step of providing a second signal at the time of switching the left-eye image and the right-eye image for inserting a black image further comprises: the second signal being provided at a time greater than 1/2t1, inserting the black image to obtain higher 3D luminance. 
     According to a preferred embodiment of the present invention, to obtain a higher 3D display luminance, the insertion time of the black image is postponed later. 
     According to a preferred embodiment of the present invention, the period of the left-eye image and the right-eye image is t1, and the step of providing a second signal at the time of switching the left-eye image and the right-eye image for inserting a black image further comprises: the second signal being provided at a time smaller than 1/2t1 inserting the black image to obtain lower 3D cross-talk. 
     According to a preferred embodiment of the present invention, to obtain a lower 3d cross-talk, the insertion time of the black image is advanced earlier. 
     The present invention provides a 3D display device, which comprises: a display panel, for providing display image; a driver chip, for providing a first signal to the display panel sequentially for providing left-eye image and right-eye image sequentially, and providing a second signal at the time of switching the left-eye image and the right-eye image for inserting a black image; and a controller, for controlling the driver chip to adjust the insertion time of the black image to obtain different 3D display quality. 
     According to a preferred embodiment of the present invention, the period of the left-eye image and the right-eye image is t1, and the controller provides the second signal at a time greater than 1/2t1, inserting the black image to obtain higher 3D luminance. 
     According to a preferred embodiment of the present invention, to obtain a higher 3D display luminance, the insertion time of the black image is postponed later. 
     According to a preferred embodiment of the present invention, the period of the left-eye image and the right-eye image is t1, and the controller provides the second signal at a time smaller than 1/2t1, inserting the black image to obtain lower 3D cross-talk. 
     According to a preferred embodiment of the present invention, to obtain a lower 3d cross-talk, the insertion time of the black image is advanced earlier. 
     The efficacy of the present invention is that to be distinguished from the state of the art. Through providing a first signal to the display panel sequentially for providing left-eye image and right-eye image sequentially, and providing a second signal at the time of switching the left-eye image and the right-eye image for inserting a black image, wherein the different 3D display quality being obtained through adjusting the insertion time of the black image, the present invention can adjust the insertion time of the black image to meet demands of higher 3D display luminance or lower 3D cross-talk for various 3D display qualities to improve viewing experience. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       To make the technical solution of the embodiments according to the present invention, a brief description of the drawings that are necessary for the illustration of the embodiments will be given as follows. Apparently, the drawings described below show only example embodiments of the present invention and for those having ordinary skills in the art, other drawings may be easily obtained from these drawings without paying any creative effort. In the drawings: 
         FIG. 1  is a flowchart of a preferred embodiment of 3D display method according to the present invention; 
         FIG. 2  is a schematic view showing the waveform of the first signal and the second signal of the 3D display method according to the present invention; 
         FIG. 3  is a schematic view showing another waveform of the first signal and the second signal of the 3D display method according to the present invention: 
         FIG. 4  is a schematic view showing the structure of an embodiment of 3D display device according to the present invention; 
         FIG. 5  is a plot of gamma (γ) characteristic of the known liquid crystal display device; 
         FIG. 6  is a schematic view illustrating the structure of a preferred embodiment of liquid crystal display device according to the present invention; 
         FIG. 5  is a schematic view showing the structure of another embodiment of 3D display device according to the present invention; 
         FIG. 6  is an enlarged schematic view showing the structure of pixel of  FIG. 5 ; and 
         FIG. 7  is a schematic view showing the equivalent circuit of the pixel structure of  FIG. 6 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The following refers to the drawings and embodiments for describing the present invention in details. 
     Referring to  FIG. 1 ,  FIG. 1  is a flowchart of a preferred embodiment of 3D display method according to the present invention. The 3D display method is applicable to a 3D display device. As shown in  FIG. 1 , the 3D display method of the present invention comprises the following steps: 
     Step S 1 : providing a first signal to the display panel sequentially for providing left-eye image and right-eye image sequentially. 
     Step S 2 : providing a second signal at the time of switching the left-eye image and the right-eye image for inserting a black image, wherein the different 3D display quality being obtained through adjusting the insertion time of the black image. 
     The 3D display method of the present invention can adjust the insertion time of the black image to meet demands of higher 3D display luminance or lower 3D cross-talk for various 3D display qualities to improve viewing experience. 
     The present invention further provides another embodiment of 3D display method for detailed description on the basis of the above embodiment. 
     Referring to  FIG. 2 ,  FIG. 2  is a schematic view showing the waveform of the first signal and the second signal of the 3D display method according to the present invention. As shown in  FIG. 2 , the period of the first signal is t1. In other words, the left-eye image and the right-eye image have a period of t1. When the viewer demands higher 3D luminance, the above step S 2  further comprises: providing the second signal at a time larger than 1/2t1 for inserting the black image to obtain higher 3D display luminance. In addition, the higher 3D display luminance the view demands, the later the insertion time of the black image is postponed. 
     When the viewer demands lower 3D cross-talk, the above step S 2  further comprises: providing the second signal at a time smaller than 1/2t1 for inserting the black image to obtain lower 3D cross-talk. In addition, specifically as shown in  FIG. 3 , the lower 3D cross-talk the view demands, the earlier the insertion time of the black image must be advanced. 
     Therefore, the 3D display method of the present invention can meet demands of higher 3D display luminance or lower 3D cross-talk through postponing or advancing the insertion time of the black image to achieve various 3D display qualities to improve viewing experience. 
     Referring to  FIG. 4 ,  FIG. 4  is a schematic view showing the structure of an embodiment of 3D display device according to the present invention. As shown in  FIG. 4 , the 3D display device  40  of the present invention comprises a controller  41 , a driver chip  42  and a display panel  43 . 
     In the present embodiment, the display panel  43  is for providing display image. The driver chip  42  is for providing a first signal to the display panel  43  sequentially for providing left-eye image and right-eye image sequentially, and providing a second signal at the time of switching the left-eye image and the right-eye image for inserting a black image. The controller  41  is for controlling the driver chip  42  to adjust the insertion time of the black image to obtain different 3D display quality. 
     Therefore, the 3D display device of the present invention can adjust the insertion time of the black image to meet demands of higher 3D display luminance or lower 3D cross-talk for various 3D display qualities to improve viewing experience. 
     The present invention further provides another embodiment of 3D display device for detailed description on the basis of the above embodiment. Refer to  FIG. 5 ,  FIG. 6  and  FIG. 7 .  FIG. 5  is a schematic view showing the structure of another embodiment of 3D display device according to the present invention,  FIG. 6  is an enlarged schematic view showing the structure of pixel of  FIG. 5 , and  FIG. 7  is a schematic view showing the equivalent circuit of the pixel structure of  FIG. 6 . As shown in  FIG. 5  and  FIG. 6 , the driver chip  42  comprises a first driver chip  421  and a second driver chip  422 . The display panel  43  comprises a plurality of pixels  430 . Each pixel  430  comprises a data line  431 , a first scan line  432 , intersecting perpendicularly to the data line  431 , a second scan line  433 , disposed in parallel with the first scan line  432 , a pixel electrode  434 , disposed between the first scan line  4332  and the second scan line  433 , and a common electrode line  435  for providing common voltage. The pixel  430  further comprises a first switch  436 , electrically connected to the first scan line  432 , and a second switch  437 , electrically connected to the second scan line  433 . 
     In the present embodiment, the gate G 1  of first switch  436  is electrically connected to the first scan line  432 , the source S 1  of the first switch  436  is electrically connected to the data line  431 , and the drain D 1  of the first switch  436  is electrically connected to the pixel electrode  434 . 
     The gate G 2  of second switch  437  is electrically connected to the second scan line  433 , the source S 2  of the second switch  437  is electrically connected to the common electrode line  435 , and the drain D 2  of the second switch  437  is electrically connected to the pixel electrode  434 , wherein the common electrode line  435  comprises two branches  4351 ,  4352 , disposed in a perpendicular intersection manner. The source S 2  of second switch  437  is connected to the branch  4352  of the common electrode line  435 . 
     In the present embodiment, a liquid crystal layer (not shown) is disposed above the pixel electrode  434 , and the common electrode line  435  is disposed below the pixel electrode  434  Therefore, a liquid crystal capacitor (CLC) is formed between the pixel electrode  434  and the liquid crystal layer, and a storage capacitor (CST) is formed between the pixel electrode  434  and the common electrode line  435  (as shown in  FIG. 7 ). 
     The following explains the operating theory of the 3D display device. 
     Also refer to  FIG. 2  and  FIG. 3 . The first driver chip  421  controls the first scan line  432  to propagate the first signal to turn on the first switch  436 . The data line  431  provides a pixel electrode voltage through the first switch  436  to the pixel electrode  434  so as to charge the pixel electrode  434 . At the end of charging, the pixel electrode  434  is in the charged state and the second driver chip  422  controls the second scan line  433  to propagate the second signal to turn on the second switch  437 . The common electrode line  435  provides a common voltage through the second switch  437  to the pixel electrode  434  to raise the voltage of the pixel electrode to the common voltage to realize the black insertion. 
     In the present embodiment, the controller  41  controls the first driver chip  421  ad the second driver chip  422  to output the first signal and the second signal, and further controls the second chip  422  to adjust the insertion time of the black image to obtain different 3d Display quality. Specifically, the period of the first signal is t1. When the viewer demands higher 3D luminance, the controller  41  further controls the second driver chip  422  at a time larger than 1/2t1 o provide the second signal for turning on the second switch  437 . The common electrode line  435  provides a common voltage through the second switch  437  to the pixel electrode  434  to realize the black insertion to obtain higher 3D display luminance. In addition, the higher 3D display luminance the view demands, the later the insertion time of the black image is postponed. 
     When the viewer demands lower 3D cross-talk, the controller  41  further controls the second driver chip  422  at a time smaller than 1/2t1 to provide the second signal for turning on the second switch  437 . The common electrode line  435  provides a common voltage through the second switch  437  to the pixel electrode  434  to realize the black insertion to obtain lower 3D cross-talk. In addition, the lower 3D cross-talk the view demands, the earlier the insertion time of the black image is advanced. 
     It should be noted that the structure of display panel  43  shown in  FIGS. 5-7  is only an embodiment of the present invention. Other structures able to realize the adjustment of insertion time of the black image are also within the scope of the present invention. 
     Therefore, the 3D display device of the present invention can meet demands of higher 3D display luminance or lower 3D cross-talk through postponing or advancing the insertion time of the black image to achieve various 3D display qualities to improve viewing experience. 
     Embodiments of the present invention have been described, but not intending to impose any unduly constraint to the appended claims Any modification of equivalent structure or equivalent process made according to the disclosure and drawings of the present invention, or any application thereof, directly or indirectly, to other related fields of technique, is considered encompassed in the scope of protection defined by the clams of the present invention.