Abstract:
A method of driving plane light is used in a liquid crystal display. A plane light device includes a first substrate, a frame, a second substrate, a fluorescent layer, a plurality of spacers, and an outer electrode layer. A plane chamber is formed between the first substrate and the second substrate to filling mixed gases therein. The outer electrode layer includes a plurality of independent electrode pairs. The mixed gas is discharged by the fluorescent layer to produce a plurality of corresponding light emitting regions after driving respectively the plurality of electrode pairs. The plurality of light emitting regions have interval lines parallel or perpendicular to scanning lines of the liquid crystal display. The plurality of light emitting regions are opened synchronously, in series or alternately. The image blurry phenomenon displayed in the LCDs will be effectively improved caused by slow response of LCD&#39;s cells.

Description:
1. FIELD OF THE INVENTION 
       [0001]    The present invention relates to plane light devices for liquid crystal displays and driving methods thereof, more specifically, to a plane light device for a liquid crystal display and a driving method thereof, which improves phenomenon of blurry images produced by overlapping video data of the liquid crystal display. 
       2. DESCRIPTION OF THE RELATED ART 
       [0002]    Liquid crystal displays are developed as a main technology of display devices. The main principle thereof is that liquid crystal molecule has a twisting character, and light pass through twisting angles of the light crystal molecule to produce different transmittance luminance, and pass through three predistributing RGB color filters to display images. 
         [0003]    Since the liquid crystal molecule itself cannot emit light, the liquid crystal display must have a light device to provide the light such that the liquid crystal display may operate normally. A conventional light device generally includes a cold cathode tube for providing linear light and a light guide plate cooperates with the cold cathode tube. The cold cathode tube provides the linear light, and the light guide plate transfers the linear light to plane light for the liquid crystal display. 
         [0004]    Since the displaying area of the LCD grows, another conventional plane light device has been developed. The conventional plane light device fills mixed gas into a plane chamber, covers a fluorescent material in the plane chamber, and provides an electrical field by using an electrode of the plane chamber to discharge the mixed gas for providing the plane light for the light crystal display. The conventional plane light device needs not the light guide plate and can eliminate dark regions produced in the large size liquid crystal display, which cooperates with the code cathode tube. 
         [0005]    However, when the light crystal display displays the images, if the light device maintains to emit the light, blurry images will be produced since the video data overlaps. This influences greatly the display quality and needs to be solved immediately. 
         [0006]    What is needed is a plane light device which can solve the above problems. 
       BRIEF SUMMARY 
       [0007]    The present invention uses a decaying element between microphones and ears to decay wanted environmental noise and music or broadcasting. 
         [0008]    A plane light device used in a liquid crystal display in accordance with a preferred embodiment of the present invention, includes a first substrate, a fluorescent layer arranged on the first substrate, a frame arranged at a periphery of the first substrate, a second substrate connecting to the frame to form a plane chamber arranged between the first substrate and the second substrate for filling mixed gas therein, a plurality of spacers arranged between the first substrate and the second substrate, and an outer electrode layer arranged another surface of the first substrate opposite to the plane chamber. The outer electrode layer includes a plurality of independent electrode pairs, and the mixed gas is discharged by the fluorescent layer to produce a plurality of corresponding light emitting regions after driving respectively the plurality of electrode pairs. 
         [0009]    The plane light device further includes an insulated layer arranged another surface of the first substrate opposite to the outer electrode layer and covering the outer electrode layer to protect the outer electrode layer. The insulated layer is an insulated adhesive tape. 
         [0010]    The plane chamber is a communicated plane chamber, and the mixed gas has no hydrargyrum. 
         [0011]    The plurality of electrode pairs are driven synchronously, in series or alternately to open the light emitting regions synchronously, in series or alternately. When the image data is not inputted, the corresponding light emitting region closes to reduce probability for displaying blurry images by overlapping the image data of the liquid crystal display. 
         [0012]    A method driving plane light in accordance with another preferred embodiment of the present invention is used to drive a plane light device used in a liquid crystal display. The plane light device includes a plurality of light emitting regions, and the plurality of light emitting regions have interval lines parallel or perpendicular to scanning lines of the liquid crystal display. The method includes following steps: closing the plurality of light emitting regions at an original point of time of inputting predetermined image data of the liquid crystal display; opening the plurality of light emitting regions in series during time of inputting real image data of the liquid crystal display; and closing the plurality of light emitting regions at finishing the time of inputting real image data of the liquid crystal display. 
         [0013]    Each following light emitting region is opened synchronously after closing each last light emitting region. 
         [0014]    Opening periods of the plurality of light emitting regions have overlapped parts. 
         [0015]    The each opening period of the each light emitting region is same. 
         [0016]    Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which: 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0017]    These and other features and advantages of the various embodiments disclosed herein will be better understood with respect to the following description and drawings, in which like numbers refer to like parts throughout, and in which: 
           [0018]      FIG. 1  is a schematic, partial cross-sectional view of a plane light device of a first embodiment of the present invention; 
           [0019]      FIG. 2  is a schematic view of a liquid crystal display corresponding to the plane light device having a plurality of light emitting regions of the first embodiment of the present invention; 
           [0020]      FIG. 3  is a schematic, partial cross-sectional view of a plane light device of a second embodiment of the present invention; 
           [0021]      FIG. 4  is a schematic view of a driving clock of a method of driving plane light of the present invention; 
           [0022]      FIG. 5  is a schematic view of a driving clock of the method of driving plane light in accordance with a third preferred embodiment of the present invention; and 
           [0023]      FIG. 6  is a schematic view of a driving clock of the method of driving plane light in accordance with a fourth preferred embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION 
       [0024]    Reference will now be made to the drawings to describe a preferred embodiment of the present plane light device, in detail. 
         [0025]    Referring to  FIG. 1 , a plane light device  1  in accordance with a first preferred embodiment of the present invention is shown. The plane light device  1  includes a first substrate  10 , a fluorescent layer  14 , a frame  13 , a second substrate  12 , a plurality of spaces  15 , an outer electrode layer  16  and an insulated layer  17 . Preferably, the first substrate  10  is a glass substrate. The fluorescent layer  14  is arranged on the first substrate  10  and is manufactured by covering fluorescent powder on the first substrate  10 . The frame  13  is arranged at the periphery of the first substrate  10 , and the periphery of the second substrate  12  connects with the frame  13  to form a plane chamber  11  between the first substrate  10  and the second substrate  12 . The frame  13  is used to support the first substrate  10  and the second substrate  12 , and the plane chamber  11  is a communicated plane chamber to fill mixed gas therein. Preferably, the mixed gas has no hydrargyrum. The plurality of spacers  15  are arranged between the first substrate  10  and the second substrate  12  to support the first substrate  10  and the second substrate  20  and maintain space of the plane chamber  11 . The outer electrode layer  16  is arranged on the substrate  10  opposite to the plane chamber  11 . The insulated layer  17  is arranged on the outer electrode layer  16  opposite to the first substrate  10  and covers the outer electrode layer  16  to protect the outer electrode layer  16 . Preferably, the insulated layer  17  is an insulated adhesive tape. 
         [0026]    The outer electrode layer  16  includes at least a plurality of independent electrode pairs (not shown). The plurality of electrode pairs are driven respectively and the driving power are transmitted through a dielectric barrier (for example, the first substrate  10  made of glass material) to discharge the mixed gas activated by the fluorescent layer  14  corresponding to the plurality of electrode pairs since the plurality of electrode pairs are arranged on the exterior of the plane chamber  11 . Therefore, a plurality of corresponding light emitting regions  100 ,  100 ′ are produced to emit light out of the second substrate  12 . Referring to  FIG. 2 , the plurality of light emitting regions  100 ,  100 ′ has a plurality of interval lines  101  arranged therebetween. The plurality of interval lines  101  are parallel to scanning lines  20  of the liquid crystal display  2  to divide the whole plane light device  1  into the plurality of parallel light emitting regions  100 ,  100 ′. In this exemplary embodiment, the plane light device  1  is divided into four light emitting regions. The amount of the light emitting regions are related to the size of the liquid crystal display  2 , and the plurality of electrode pairs are distributed and configured by the need of the light emitting regions. The interval lines  101  between the plurality of light emitting regions  100 ,  100 ′ may be also designed to be perpendicular to the scanning lines  20  of the liquid crystal display  2  for corresponding to the configuration of the scanning lines of the liquid crystal display (not shown). 
         [0027]    The plurality of electrode pairs are driven synchronously, in series or alternately to make the plurality of light emitting regions  100 ,  100 ′ emit synchronously, in series or alternately. If the time of closing or opening the plurality of light emitting regions correspond to the time of inputting data signals of the liquid crystal display  2 , and the corresponding light emitting regions close when the data signals of the liquid crystal display  2  produce overlapping images, the overlapping images can be avoided. Therefore, the amount of the plurality of light emitting regions is corresponding to the data transmitting amount and time of the liquid crystal display  2 . For example, this exemplary embodiment includes the four light emitting regions. 
         [0028]    Referring to  FIG. 3 , a plane light device in accordance with a second preferred embodiment of the present invention is shown. The plane light device  3  also includes a first substrate  30 , a fluorescent layer  34 , a frame  43 , a second substrate  32 , a plurality of spaces  35 , and so on. The plane light device  3  is similar to that of the first preferred embodiment, for example, a plane chamber  31  is formed between the first substrate  30  and the second substrate  32 , and the plane chamber  31  is a communicated plane chamber to fill mixed gas therein, except that the plane light device  3  further includes a first outer electrode layer  36 , a second outer electrode layer  38 , a first insulated layer  37 , and a second outer insulated layer  39 . The first outer electrode layer  36  is arranged on another surface of the first substrate  30  opposite to the plane chamber  31 . The second outer electrode layer  38  is arranged on another surface of the second substrate  32  opposite to the plane chamber  31 . The first insulated layer  37  is arranged on another surface of the first outer electrode layer  36  opposite to the first substrate  30 , and covers the first outer electrode layer  36  to protect the first outer electrode layer  36 . The second outer insulated layer  39  is arranged on another surface of the second outer electrode layer  38  opposite to the second substrate  32 , and covers the second outer electrode layer  38  to protect the second outer electrode layer  38 . Preferably, the first insulated layer  37  and the second insulated layer  39  are respectively an insulated adhesive tape, and the second insulated layer  39  is a transparent insulated adhesive tape. 
         [0029]    The first outer electrode layer  36  and the second outer electrode layer  38  respectively include at least a plurality of independent electrodes (not shown) to form a plurality of independent electrode pairs (not shown). The plurality of electrode pairs are driven respectively and the driving power are transmitted through a dielectric barrier (for example, the first substrate  30  and the second substrate  32  made of glass material, etc.) to discharge the mixed gas activated by the fluorescent layer  34  corresponding to the plurality of electrode pairs since the plurality of electrode pairs are arranged on the exterior of the plane chamber  11 . Therefore, a plurality of corresponding light emitting regions  100 ,  100 ′ are produced to emit light out of the second substrate  12 . Referring to  FIG. 2 , the plurality of light emitting regions  100 ,  100 ′ has a plurality of interval lines  101  arranged therebetween. The plurality of interval lines  101  are parallel to scanning lines  20  of the liquid crystal display  2  to divide the whole plane light device  1  into the plurality of parallel light emitting regions  100 ,  100 ′. In this exemplary embodiment, the plane light device  1  is divided into four light emitting regions. The amount of the light emitting regions are related to the size of the liquid crystal display  2 , and the plurality of electrode pairs are distributed and configured by the need of the light emitting regions. The interval lines  101  between the plurality of light emitting regions  100 ,  100 ′ may be also designed to be perpendicular to the scanning lines  20  of the liquid crystal display  2  for corresponding to the configuration of the scanning lines of the liquid crystal display (not shown). 
         [0030]    The present invention also discloses a driving method of plane light to drive a plane light device of a liquid crystal display. The plane light device includes a plurality of light emitting regions distributed parallel. Interval lines of the plurality of the light emitting regions are parallel or perpendicular to scanning lines of the liquid crystal display. The driving method includes the following steps. 
         [0031]    Firstly, referring to  FIG. 4 , the plurality of light emitting regions are closed during time  40  of inputting predetermined image data of the liquid crystal display, that is, no any light emitting regions are opened at the first interval period  42 , wherein the time  40  of inputting predetermined image data is a standard of a general liquid crystal display. For example, if the liquid crystal display has a frequency of 120 Hz, the time  40  of inputting image predetermined data is 8.3 ms, and the first interval period  42  (that is, the time of having no any light emitting regions opened) is 0.052 ms. Therefore, since no any real image data are input during the first interval period  42 , no any light emitting regions are opened, thus the probability for displaying error images is decreased. 
         [0032]    Next, the plurality of light emitting regions are opened in series during the time  41  of inputting real image data of the liquid crystal display, wherein the time  41  of inputting real image data is an interval of inputting real image data of the liquid crystal display. In fact, the original point of the time  41  of inputting real image data is later than that of the time  40  of the predetermined image data to ensure the image data to be displayed early for avoiding to display error images since the image data are inputted early. In this exemplary embodiment, the plane light device includes the four parallel light emitting regions, and a plurality of opening periods  51 ,  52 ,  53 ,  54  are opened in series. That is, each following light emitting region is opened synchronously at each last light emitting region is closed. For example, if the time  41  of inputting real image data of the liquid crystal display is 7.92 ms, each light emitting region has a same interval period of being opened, and the same interval period is 1.98 ms. Referring to  FIG. 5 , a plane light device  4  in accordance with a third preferred embodiment of the present invention is shown. The plane light device  4  also includes four parallel light emitting regions. Opening periods  55 ,  56 ,  57 ,  58  of the plurality of light emitting regions have overlapped parts. That is, each following light emitting region is opened before each last light emitting region is closed completely. The above embodiments correspond to the inputting image data and the amount of the light emitting region. 
         [0033]    Lately, the whole plurality of light emitting regions are closed at finishing the time  41  of inputting real image data of the liquid crystal display, that is, no any light emitting regions are opened during the second interval period  43 . For example, the second interval period  43  (the interval period having no any light emitting regions opened) is 0.052 ms. Stored current is discharged by displaying capacitor of the liquid crystal display during the second interval period  43 , the probability for displaying error images is decreased since no any light emitting regions are opened. 
         [0034]    Referring to  FIG. 6 , opening periods  55 ′  56 ′  57 ′  58 ′ of the light emitting regions in FIG. can be designed into the time  41  of inputting real image data synchronous (opening and closing synchronously). That is, the plurality of electrodes are driven synchronously to achieve the same effect through real design and test. 
         [0035]    The above description is given by way of example, and not limitation. Given the above disclosure, one skilled in the art could devise variations that are within the scope and spirit of the invention disclosed herein, including configurations ways of the recessed portions and materials and/or designs of the attaching structures. Further, the various features of the embodiments disclosed herein can be used alone, or in varying combinations with each other and are not intended to be limited to the specific combination described herein. Thus, the scope of the claims is not to be limited by the illustrated embodiments.