Abstract:
A geometrically true and perfectly flat display screen includes a first frame, a backlight module and a first bolster. The backlight module is received in the first frame and includes a reflector plate at a lower portion of the backlight module. The first bolster is directly attached to the reflector plate.

Description:
FIELD 
       [0001]    The subject matter herein generally relates to assembly of a touch display to a device. 
       BACKGROUND 
       [0002]    Many electronic devices include a touch display. Gummed foam can be used to attach the display. However, the foam may not be attached to the frame perfectly, which may create bubbles between the foam and the frame, and further cause ripples on the display. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0003]    Many aspects of the disclosure can be better understood with reference to the following figures. The components in the figures are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout several views. 
           [0004]      FIG. 1  is an exploded view of a first exemplary embodiment of a display screen. 
           [0005]      FIG. 2  is another exploded view of the display screen of  FIG. 1 . 
           [0006]      FIG. 3  is a cross-sectional view of a portion of the display screen of  FIG. 1 . 
           [0007]      FIG. 4  is a cross-sectional view of a portion of a second exemplary embodiment of the display screen. 
           [0008]      FIG. 5  is a cross-sectional view of a portion of a third exemplary embodiment of the display screen. 
       
    
    
     DETAILED DESCRIPTION 
       [0009]    It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the exemplary embodiments described herein. However, it will be understood by those of ordinary skill in the art that the exemplary embodiments described herein can be practiced without these specific details. In other instances, methods, procedures and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the exemplary embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure. 
         [0010]    The term “coupled” is defined as connected, whether directly or indirectly through intervening components, and is not necessarily limited to physical connections. The connection can be such that the objects are permanently connected or releasably connected. The term “comprising,” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series and the like. 
         [0011]      FIGS. 1 and 2  illustrate a display  100 . The display  100  can be a touch display for a mobile phone, a computer, a television or a play station. The display  100  includes a base board  10 , a display panel  20 , a backlight module  30 , a first bolster  40 , a first frame  50  and a second frame  60 . 
         [0012]      FIG. 3  illustrates that the base board  10  is parallel to and overlaps above the display panel  20 . The base board  10  is substantially rectangular and has a size larger than that of the display panel  20 . The base board  10  is made of transparent material, such as glass or ceramic. 
         [0013]    The display panel  20  is preferably a liquid crystal display (LCD) panel. The display panel  20  includes an upper polarizer  21 , a color filter (CF)  22 , a thin film transistor layer  23  and a lower polarizer  24  in parallel in the exemplary embodiment. The upper polarizer  21  is stacked on the color filter  22 , the color filter  22  is stacked on the thin film transistor layer  23 , and the thin film transistor layer  23  is stacked on the lower polarizer  24 . The base board  10  is attached to the upper polarizer  21  through a first glue layer  91 . The first glue layer  91  has substantially the same shape and size as the upper polarizer  21 , which is arranged between the base board  10  and the upper polarizer  21 . Preferably, the first glue layer  91  is an optical adhesive. The upper polarizer  21  has substantially the same shape and size as the lower polarizer  24 . The color filter  22  has substantially the same shape and size as the thin film transistor layer  23 . The size of the upper polarizer  21  is smaller than the size of the color filter  22 . The color filter  22  includes a shading portion  25  configured to prevent light leakage and improve color contrast ratio. The shading portion  25  is on a surface of the color filter  22  facing the thin film transistor layer  23 . Preferably, the shading portion  25  is a black matrix. 
         [0014]    The backlight module  30  is arranged below the display panel  20 . The backlight module  30  includes an optical film  31 , a light guide plate (LGP)  32  and a reflector plate  33  in parallel. The optical film is stacked on the light guide plate, and the light guide plate is stacked on the reflector plate. The optical film  31  has substantially the same shape and size as the light guide plate  32  and is smaller than the reflector plate  33 . The optical film  31  includes an upper brightness enhancement film  34 , a lower brightness enhancement film  35  and a diffuser  36  in parallel. The upper brightness enhancement film  34  is stacked on the lower brightness enhancement film  35 , and the lower brightness enhancement film  35  is stacked on the diffuser  36 . The upper brightness enhancement film  34 , the lower brightness enhancement film  35  and the diffuser  36  have substantially similar shapes and sizes. 
         [0015]    The first bolster  40  is parallel to the optical film  31  and directly attached to a bottom surface of the reflector plate  33 . The first bolster  40  has substantially similar shape and size as the reflector plate  33 . The first bolster  40  is adhesive and can attach to the bottom surface of the reflector plate  33 . In at least one exemplary embodiment, the first bolster  40  can be made of acrylic foam. 
         [0016]    The first frame  50  has an opening for receiving the display panel  20 , the backlight module  30 , the first bolster  40  and the second frame  60 . The first frame  50  includes a bottom board  51 , a peripheral wall  52 , and a receiving portion  53 . The bottom board  51  is parallel to the first bolster  40 . The peripheral wall  52  surrounds the bottom board  51 . The bottom board  51  and the peripheral wall  52  enclose the receiving portion  53  for receiving the display panel  20 , the backlight module  30 , the first bolster  40  and the second frame  60 . The bottom board  51  is arranged below the first bolster  40  and spaced from the first bolster  40 . The peripheral wall  52  surrounds the display panel  20  and the backlight module  30 . A top of the peripheral wall  52  and the bottom surface of the base board  10  are attached together through a second glue layer  92 . The second glue layer  92  thus defines an enclosed space between the peripheral wall  52  and the base board  10 . The second glue layer  92  is a hollow rectangular sheet of similar size as the peripheral wall  52 . Preferably, the second glue layer  92  is a gum layer, but is not limited to the exemplary embodiment herein. 
         [0017]    The second frame  60  receives the display panel  20  and the backlight module  30 , the display panel  20  and the backlight module  30  cooperatively form an integral display module. The second frame  60  includes a bottom portion  61 , a side portion  62  and a receiving portion  63 . The bottom portion  61  is hollow and defines a first receiving section  631  in the middle of the bottom portion  61 . The side portion  62  is formed to perpendicularly surround a periphery of the bottom portion  61 . The side portion  62  defines a second receiving section  632  in the middle of the side portion  62 . The receiving portion  63  includes the first receiving section  631  and the second receiving section  632 , the first receiving section  631  and the second receiving section  632  respectively receive the backlight module  30  and the display panel  20 . The bottom portion  61  is located below the lower polarizer  24  and surrounds the backlight module  30 . A top surface of the bottom portion  61  is parallel to the top surface of the upper brightness enhancement film  34 , and a bottom surface of the bottom portion  61  is parallel to the bottom surface of the reflector plate  33 . An adhesive tape  93  is arranged between the top surface of the bottom portion  61 , the top surface of the upper brightness enhancement film  34  and the bottom surface of the lower polarizer  24 . The tape  93  secures these components together and prevents light leakage therebetween. The adhesive tape  93  is substantially a rectangular sheet and covers a gap between the bottom portion  61  and the upper brightness enhancement film  34 . Preferably, the adhesive tape  93  is a shading adhesive tape. The bottom portion  61  is spaced from the bottom board  51 . The bottom surface of the bottom portion  61  defines a groove  64  in air communication with the receiving portion  63 . The groove  64  receives the reflector plate  33 . Preferably, a size of the groove  64  is similar to that of the reflector plate  33 , and a size of the first bolster  40  is greater than that of the reflector plate  33 . The first bolster  40  is coupled to the bottom portion  61 . 
         [0018]    In the first exemplary embodiment, the first bolster  40  is attached to the reflector plate  33  by its own viscosity. Uniform and precise flatness is achieved between the first bolster  40  and the reflector plate  33  and no bubbles are generated. The display  100  is not rippled and has improved shockproofing and impact resistance. 
         [0019]      FIG. 4  illustrates a second exemplary embodiment of a display  100   a,  which is structurally similar to the first exemplary embodiment. Particularly, the display  100   a  further includes a sensor film  70 . Preferably, the sensor film  70  is a touch force sensor film. The sensor film  70  is attached to the first bolster  40  through a third glue layer  94  and spaced from the bottom board  51 . Preferably, the third glue layer  94  is a gum layer. The sensor film  70  is configured to detect force on the display  100   a.  When the display  100   a  receives an external force, the first bolster  40  deforms accordingly, the sensor film  70  detects the force and outputs feedback signals. 
         [0020]    In the second exemplary embodiment, one side of the first bolster  40  is attached to the reflector plate  33  according to its own viscosity. Another side of the first bolster  40  is attached to the sensor film  70 . Microscopic flatness between the first bolster  40  and the reflector plate  33  is thus ensured and no bubbles are generated. 
         [0021]      FIG. 5  illustrates a third exemplary embodiment of a display  100   b,  which is structurally similar to the second exemplary embodiment. Particularly, the display  100   b  further includes a second bolster  80 . The second bolster  80  is sandwiched between the sensor film  70  and the bottom board  51 . Additionally, the second bolster  80  is viscous and sticks between the sensor film  70  and the bottom board  51 . In the third exemplary embodiment, the second bolster  80  is made of acrylic foam of substantially the same size as the first bolster  40 . The display  100   b  of the third exemplary embodiment increases a buffering or shock-absorbing effect by arranging the second bolster  80  between the sensor film  70  and the bottom board  51 . 
         [0022]    In the third exemplary embodiment of a display  100   b  the first bolster  40  is again attached to the reflector plate  33  according to its own viscosity. 
         [0023]    It is believed that the exemplary embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the scope of the disclosure or sacrificing all of its advantages. The examples herein described are mere illustrative exemplary embodiments of the disclosure.