Abstract:
A double-sided display is provided. The double-sided display includes two display panels comprising electroluminescene panels, organic light emitting panels, and polymer light emitting panels. The two display panels are stacked partially overlapped. A flexible printed circuit board having a bending portion adapted for electrically connecting with the two display panels.

Description:
FIELD OF THE INVENTION  
       [0001]     The present invention relates to a double-sided display, and more particularly relates to a double-sided display including an integrated printed circuit and two display panels partially overlapped each other.  
       DESCRIPTION OF THE RELATED ART  
       [0002]     A normal double-sided display used in the electronic products includes two display panels disposed back-to-back to each other. And the two display panels are connected respectively with the corresponding printed circuits and the integrated circuits (IC). However, by the trend of light weight and thin thickness of the electronic products, the excess and complicated circuits of the conventional double-sided display would not meet the requirements of this trend of the electronic products. And the way to connect the printed circuit of the two display panels and the integrated circuit (IC) together without affecting the output of the normal display is a very important issue in design.  
       SUMMARY OF THE INVENTION  
       [0003]     According to the above description of the related art, since the front and back display panels of the conventional double-sided display need to be connected with different printed circuit boards and integrated circuit, the conventional double-sided display can&#39;t meet the requirements of simplification, low weight and thin thickness. Therefore, a double-sided display is provided herein. This double-sided display is provided to simplify the circuit design or layout of the double-sided display and reduce the amount of the devices to achieve the requirement of low weight and thin thickness. The present invention also provides a printed circuit board design to meet the requirements of the display panels of the double-sided display without affecting the normal output of the display panels.  
         [0004]     According to the purposes described above, a double-sided display is provided which includes two display panels stacked partially overlapped and a flexible printed circuit board bonded with two electrical bonding areas after being bended and exposing the display area of the double-sided display via an opening. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0005]     The accompany drawings incorporated in and forming a part of the specification illustrate several aspects of the present invention, and together with the description serve to explain the principles of the invention. In the drawings:  
         [0006]      FIG. 1A-1C  are assembling process drawings illustrating a double-sided display provided in the preferred embodiment of the present invention; and  
         [0007]      FIG. 2A-2B  are assembling process drawings illustrating a double-sided display provided in another preferred embodiment of the present invention. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0008]     The following detailed description of the present invention describes a double-sided display necessary to provide an understanding of the present invention, but does not cover a complete structure composition and the operating theory. The portions related to the conventional techniques are briefly described, and the parts of the drawings are not proportionally drafted. While embodiments are discussed, it is not intended to limit the scope of the present invention. Except expressly restricting the amount of the components, it is appreciated that the quantity of the disclosed components may be greater than that disclosed.  
         [0009]     Referring to  FIG. 1A , according to a double-sided display provided in a preferred embodiment of the present invention, the double-sided display  1  includes a first display panel  10 , a second display panel  11 , and a printed circuit board  12  for providing driving signals. In order to reduce the thickness of the double-sided display  1  and consider the convenience of the connecting operation of the first display panel  10  and the second display panel  11  together with the printed circuit board  12 , the first display panel  11  and the second display panel  12  are connected and partially overlapped so that a first bonding area  101  and a second bonding area  111  thereof are exposed and a first edge connector  102  and a second edge connector (not shown) are exposed as well.  
         [0010]     Besides, a first polarizer (not shown) and a second polarizer  113  can be disposed on the first display region (not shown) of the first display panel  10  and the second display region  112  of the second display panel  11 , respectively. A first integrated circuit (IC)  103  and a second integrated circuit (IC) (not shown) for processing driving signals can be disposed on the first bonding area  101  and the second bonding area  111 , respectively. Furthermore, the first integrated circuit (IC)  103  or the second integrated circuit (not shown) can also be disposed on the printed circuit board  12 , and connected with the first bonding area  101  or the second bonding area  111 , respectively.  
         [0011]     In the embodiment of the present invention, since the printed circuit board  12 , which may be a flexible printed circuit board for example, can be connected with the first display panel  10  and the second display panel  11 , can be used to expose the third edge connector  121  and the fourth edge connector  122  which, can connect with the first edge connector  102  and the second edge connector (not shown), respectively.  
         [0012]     Still referring to  FIG. 1A , the printed circuit board  12  and the second display panel  11  partially overlapped can be connected, wherein the fourth edge connector  122  and the second edge connector (not shown) are connected by pressing processes. After the fourth edge connector  122  and the second edge connector (not shown) are connected, as shown in FIG.  1 B, through the bending portion  130 , therefore the printed circuit board  12  can be bent and easily connect the third edge connector  121  and the first edge connector  102 .  
         [0013]     Referring to  FIG. 1B  and  FIG. 1C , in order not to affect the normal display of the second display panel  11  and to avoid increasing the thickness of the whole double-sided display  2 , an opening  123 A structure is formed between the fourth edge connector  122  and the third edge connector  121  on the printed circuit board  12  so that when the third edge connector  121  and the first edge connector  102  are connected by pressing processes as shown in  FIG. 1C , the second polarizer  113  disposed on the second display region  112  can be disposed within the region of the opening  123 A without overlapping the printed circuit board  12 . The area of the second polarizer  113  can be smaller than the area of the opening  123 A. Besides, in order to reduce the retracting force resulting from the connection of the fourth edge connector  122  and the second edge connector (not shown) by pressing processes, which would affect the connection of the third edge connector  121  and the first edge connector  102 . Therefore, the width W of the connecting area of the fourth edge connector  122  and the third edge connector  121  on the printed circuit board  12  is reduced. In order to achieve a smooth connection between the third edge connecter  121  and the first edge connecter  102 , the region  124  of the printed circuit board  12  closed to the third edge connector  121  is made of a continuous copper layer to increase the strength of the printed circuit board  12 .  
         [0014]     Referring to  FIG. 1A , the opening  123 A formed in the printed circuit board  12  is a closed opening. However, in another embodiment of the present invention, referring to  FIG. 2A , the opening  123 B formed in the printed circuit board  12  is a non-closed opening. The fourth edge connector  122  and the third edge connector  121  formed neighboring to the opening  123 B can be sequentially connected with the second edge connector (not shown) of the second display panel  11  and the first edge connector  102  of the first display panel  10 .  
         [0015]     According to the embodiments of the present invention described above, electroluminescene (EL) panels, such as organic light emitting diode (OLED) panels or polymer light emitting diode (PLED) panels, can be used respectively or together in the first display panel  10  and the second display panel  11 . And the first integrated circuit  103  disposed on the first display panel  10  and the second integrated circuit (not shown) disposed on the second display panel  11  can be integrated into one integrated circuit disposed on any one of the display panels and reduce the amount of devices of the double-sided display.  
         [0016]     The foregoing description is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obvious modifications or variations are possible in light of the above teachings. In this regard, the embodiment or embodiments discussed were chosen and described to provide the best illustration of the principles of the invention and its practical application to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such modifications and variations are within the scope of the invention as determined by the appended claims when interpreted in accordance with the breadth to which they are fairly and legally entitled.