Abstract:
There has been a problem with a film provided on a surface of an input section such as a touch panel etc., which is arranged on a display such as a conventional type of liquid crystal display or the like is swelled or corrugated owing to deterioration with the lapse of time, or change in temperature and humidity. 
     According to the present invention, there is provided an information input display device. The device comprises a drawing action section which generates tension to draw outward directly or indirectly by elasticity in a film, when an input section capable of displaying in a transmittable manner, which is arranged on a surface of a display section, is attached to an housing. The device prevents swelling or corrugation of the film from occurring by the tension.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to the improvement in an information input display device, which comprises a display mounted on an information terminal represented by a portable telephone or PDA (personal digital assistant) and an input section disposed on the display. 
     2. Description of the Related Art 
     An information terminal having a liquid crystal display for displaying information are generally known. On the liquid crystal display, there is provided a device mounted with a touch panel serving as an input section. Through the input section, instructions to select display items, or input of characters, numerals, etc. can be carried out by touching the touch panel so as to put pressure thereon. 
     The touch panel generally has a structure as shown in FIG.  9 . In the touch panel  1 , a conductive layer  102  is formed on a glass substrate  101  (or a plastic substrate) by using a technique of forming layer such as a vapor deposition method, and wiring  103  made of material having low resistivity such as silver (Ag) etc. is formed on the conductive layer  102 . The glass substrate  101  with insulating properties is transparent or capable of display in a transmittable manner. Separately from the above, coating layers  105  are formed on both surfaces of a film  104  so as to make the film  104  durable. The film  104  is made of a PET (polyethylene terephthalate) sheet etc. and transparent or capable of display in a transmittable manner. A conductive layer  106  is formed on one of the coating layers  105 . 
     A surface of the glass substrate  101  on which conductive layer  102  is formed and a surface of the film  104  on which the conductive layer  106  is formed are opposed to each other, and both peripheral end portions of the above surfaces are bonded together with a space of about 0.1 mm interposed therebetween with an adhesive  107  such as a adhesives double sided tape etc. In such a structure, by putting pressure on the film  104  from above, the conductive layer  106  is brought into contact with the conductive layer  102 , thereby input can be carried out. 
     Being manufactured for portable use, this information terminal is miniaturized and lightened. Therefore, a user can carry the terminal in bag or a pocket. Naturally enough, the information terminal may be dropped mistakenly while the user is carrying it with him or her, or holding it in his or her hand. So, measures to relieve impact caused by being dropped have been taken to the terminal, so as to prevent it from being damaged. With respect to the display section including the touch panel, an elastic member such as rubber etc. surrounds an edge of the display section to protect the display from an impact and from water damage. In addition, preventive measures against damage caused by static electricity are also taken. For example, as such a structure, the present applicant has disclosed a constitution as shown in  FIG. 10  to realize the moderation of impact and waterproofing. 
       FIG. 10  is a cross-section view of a device, wherein a touch panel  109  is superposed with a liquid crystal display (not shown), and a gasket  108  with a hook-shaped cross-section, which has elasticity and thus can be a buffer, is fitted in a manner of surrounding an edge of the superposed touch panel  109  and liquid crystal display around. The superposed touch panel  109  and liquid crystal display is fixed by means of a metal frame (not shown) so as to support and press the gasket  108  against a housing  110 . In such a structure, as shown in  FIG. 10 , an end portion of the gasket  108 , which comes into contact with the touch panel  109 , is formed into a ring shape. When the gasket  108  is pressed by the metal frame (not shown), the end portion of the gasket  108  is crushed between a surface of the touch panel  109  and an inner surface of the housing  110 . Thus, the touch panel  109  can be held and fixed with proper force, while having a waterproof function. 
     In the aforementioned touch panel, a case may occur in that the film  104  constituting a surface of the panel is swelled or corrugated owing to deterioration with lapse of time, temperature or humidity. In the touch panel, the almost entire periphery of the film  104  is bonded to the glass substrate  101  with the adhesive  107  so that the film  104  is fixed. There is a difference in the coefficient of thermal expansion or elongation caused by moisture absorption between the film  104  and the glass substrate  101 . Therefore, the swell or corrugation may occur easily owing to the influence of heat or humidity, or deformation of the adhesive  107  owing to heat. 
     In the case where the film  104  is swelled or corrugated as having previously been described, a problem arises in that: even if input operation is performed by signing with light force, the operation can not be carried out properly; or input operation can not be performed because of a short-circuit between the conductive layer  106  of the film  104  and the conductive layer  102  on the glass substrate  101 . In addition, when the distance between the film  104  and the glass substrate  101  becomes considerably short, another problem thus arises in that Newton ring occurs so that it becomes difficult to see information displayed on the panel. 
     This touch panel is seldom used alone. In general, the touch panel is disposed on a display screen and incorporated in a device for use. If the aforementioned information terminal mounted with the touch panel is for industrial use, the touch panel is to be used under severe conditions (for example, the operation environment is in the range of −20 to 50° C., the storage environment is in the range of −40 to 70° C.). For this reason, it is required for the touch panel to have excellent durability. 
     A touch panel (information input device) to be mounted on an information terminal shown in  FIG. 10  is fixed through the gasket  108  so as to provide protection from impact and water. In a structure in which the gasket  108  surrounds the touch panel  109  as shown in  FIG. 10 , assume that the film  104  of the touch panel  109  elongates owing to high temperature or moisture absorption. In this case, even if the temperature or humidity has fallen and thus a portion of the film, which is drawn to the inner side from the point where the gasket holds the film down, is intended to revert to its former state, it cannot be achieved owing to the pressure from the gasket. The portion remains on the display screen so that swelling or corrugation may occur. 
     In addition to such a phenomenon, assume a state in which the touch panel moves in assembly to the housing  110  or after shipment, and the gasket  108  holds an end portion of the touch panel  109  as shown in FIG.  11 . In such a state, the force (denoted by a reference character Fe in  FIG. 11 ) to intend the film  104  to move to the inner side occurs, and thus an adhered portion is displaced to the inner side. Therefore, the film is swelled or corrugated. In addition, as the degree of crushing an end portion of the gasket  108  is increased so as to hold the film  104  harder for the purpose to waterproof the device or prevent the touch panel  109  from being moved, swelling or corrugation appears remarkably and easily. When the swelling or corrugation occurs of the film, a problem similar to ones described above arises. 
     BRIEF SUMMARY OF THE INVENTION 
     An object of the present invention is to provide an information input display device, which has a mechanism to perform a process of suppressing the occurrence of swelling or corrugation of a film of an input section disposed on a display such as a liquid crystal display etc. 
     To achieve the above-described object, according to a first aspect of the invention, there is provided an information input display device, comprising: 
     a display section to indicate information; 
     an input section arranged on a surface of the display section and capable of displaying the information in a transmittable manner; and 
     a casing to contain the display section and the input section, wherein 
     the input section comprises: a base material capable of displaying in a transmittable manner; a film capable of displaying in a transmittable manner; and an adhesives to adhere a surrounding portion of the film to the base material on which the film is superposed, and 
     the casing has a drawing action section to apply tension to the film directly or indirectly. 
     In addition, according to a second aspect of the invention, there is provided an information input display device, comprising: 
     a display section to indicate information; 
     an input section arranged on a surface of the display section and capable of displaying the information in a transmittable manner; 
     a casing to contain the display section and the input section; 
     an elastic member to surrounds the entire side portion of the input section and the display section; and 
     a frame member to protect the surround of the display section and the input section through the elastic member and support the display section and the input section by connecting with the casing, wherein 
     the input section comprises a base material capable of displaying in a transmittable manner; a film capable of displaying in a transmittable manner; and an adhesives to adhere a surrounding portion of the film to the base material on which the film is superposed, and 
     the casing has a drawing action section to apply tension to the film directly or indirectly. 
     In the information input display device having the above-described constitution, tension is applied to the film of the input section to draw the film outward through the drawing action section, so that swelling or corrugation can be prevented from occurring. In addition, even there is a dislocation in a positional relationship in assembling the drawing action section, the drawing action section guides to the proper position. Thus, the entire periphery of the display section can be held uniformly. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
         FIG. 1  is a view showing a constitution example of assembly in mounting a touch panel on an information terminal device; 
         FIG. 2  is a cross-sectional view showing in detail a constitution example of assembly in mounting the touch panel on an information terminal device according to a first embodiment; 
         FIGS. 3A ,  3 B,  3 C are views for explaining tension generated by a gasket in assembly according to a first embodiment; 
         FIGS. 4A ,  4 B are diagrams for explaining an annealing process to a touch panel; 
         FIGS. 5A ,  5 B are cross-sectional views in detail showing a constitution example of assembly in mounting the touch panel on an information terminal device according to a second embodiment; 
         FIG. 6  is a cross-sectional view in detail showing a constitution example of assembly in mounting the touch panel on an information terminal device according to a third embodiment; 
         FIGS. 7A ,  7 B are cross-sectional views in detail showing a constitution example of assembly in mounting the touch panel on an information terminal device according to a fourth embodiment; 
         FIGS. 8A ,  8 B are cross-sectional views in detail showing a constitution example of assembly in mounting the touch panel on an information terminal device according to a fifth embodiment; 
         FIG. 9  is a view showing a general constitution example of a conventional touch panel; 
         FIG. 10  is a view showing an example of an assembly mechanism including conventional functions of relieving impact and waterproofing in a touch panel to be mounted on a portable information terminal device; and 
         FIG. 11  is a view for explaining problems in an assembly mechanism of a conventional touch panel having functions of relieving impact and waterproofing. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. 
     A process to be explained first is an annealing process for suppressing the occurrence of swelling or corrugation in a film integrated with a touch panel. The touch panel has the aforementioned structure as shown in FIG.  9  and serves as an input section capable of displaying information in a transmittable manner. The annealing process is applied before to assembly of the touch panel into a mechanism which prevents swelling or corrugation from occurring in the film of the touch panel in each embodiment to be described later. 
     As shown in  FIG. 4A , touch panels  1  are mounted on a flat glass plate  2 . A flat PET sheet  3  is put on upper surfaces of the touch panels  1 , and further a flat glass plate  4  serving as a weight is mounted thereon so as to put a load to the respective touch panels  1  equally. In this embodiment, a load of about 240 g is put on each of the touch panels, for example. Then, the annealing process is applied at 120° C. in the atmosphere and for the duration of 45 minutes. The annealing process is applied using a heater or a heating lamp. 
     An effect of preventing swelling or corrugation in the film of the touch panels  1  whereto the annealing process described above is applied will be explained. 
     Prepare a touch panel to which the annealing process is applied and another touch panel to which the annealing process is not applied, and the degree of swelling in each of the touch panels is measured. Next, acceleration tests are carried out so as to observe how the degrees of swelling in both of the touch panels change with the lapse of time. The acceleration tests are conducted such that the touch panels are left under the state of high temperature and high humidity such as the temperature of 70° C. and relative humidity of 85%, for twelve hours, for example. Table 1 shows the measurement results of the acceleration tests carried out under the above described state to the both touch panels, one to which the annealing process is applied and the other one to which the annealing process is not applied. 
     
       
         
               
               
             
               
               
               
               
               
               
             
               
             
               
               
               
               
               
               
             
               
             
               
               
               
               
               
               
             
           
               
                   
                 TABLE 1 
               
             
             
               
                   
                   
               
               
                   
                 Degree of sweelling (at the most swelled part) 
               
             
          
           
               
                 Sample No. 
                 1 
                 2 
                 3 
                 4 
                 Average 
               
               
                   
               
             
          
           
               
                 Touch Panel Annealed 
               
             
          
           
               
                 Before the 
                 0.097  mm   
                 0.101  mm   
                  0.09  mm   
                 0.095  mm   
                 0.096  mm   
               
               
                 acceleration 
               
               
                 test 
               
               
                 After the 
                 0.088  mm   
                 0.086  mm   
                 0.099  mm   
                 0.085  mm   
                  0.09  mm   
               
               
                 acceleration 
               
               
                 test 
               
               
                 Change in 
                 0.91% 
                 0.85% 
                 1.10% 
                 0.89% 
                 0.93% 
               
               
                 swelling 
               
               
                 degree 
               
             
          
           
               
                 Touch Panel not Annealed 
               
             
          
           
               
                 Before the 
                 0.111  mm   
                 0.144  mm   
                 0.093  mm   
                 0.125  mm   
                 0.118  mm   
               
               
                 acceleration 
               
               
                 test 
               
               
                 After the 
                 0.474  mm   
                 0.545  mm   
                 0.273  mm   
                 0.527  mm   
                 0.455  mm   
               
               
                 acceleration 
               
               
                 test 
               
               
                 Change in 
                 4.27% 
                 3.78% 
                 2.94% 
                 4.22% 
                 3.85% 
               
               
                 swelling 
               
               
                 degree 
               
               
                   
               
             
          
         
       
     
     According to the measurement results, with respect to the touch panel whereto the annealing process is applied, values before and after the acceleration test are almost the same, so that it can be find that no swelling occurs in the touch panel itself. On the other hand, with respect to the touch panel whereto the annealing process is not applied, the degree of swelling increased four point three times as much as its initial condition at the maximum, and three point nine times as much as it was on average. 
     It is obvious that factors in occurrence of swelling or corrugation, which the touch panel originally has, can be suppressed by applying the annealing process. 
     Next, as a first embodiment, a mechanism to prevent the occurrence of swelling or corrugation in a film of a touch panel mounted on an information terminal device will be described.  FIG. 1  shows a constitution of assembly in mounting a touch panel with an annealing process applied thereto on an information terminal device. The information terminal device is designed for portable use, with a structure of preventing from being damaged by dropping, waterproof, dustproof and preventing from being damaged caused by static electricity. 
     In this constitution, the touch panel  1  is disposed on a liquid crystal display (LCD)  11 . A driving circuit is mounted on the rear surface of the liquid crystal display  11 . The touch panel  1  and the LCD  11  are surrounded by a gasket  12  to be described later, which has elasticity so as to serve as a buffer member and has a frame shape with a hook-shaped cross-section. The gasket  12  is supported by a metal frame  14  and fixed in a manner of being held to a housing  13 .  FIG. 2  shows a cross-sectional constitution of the enlarged state where the gasket  12  is fixed to the housing  13 . 
     An end portion of a film  1   a  included in the touch panel  1  is cut so as not to extend to an end surface of a touch panel substrate  1   b . This arrangement is provided as a “relief” such that, even if the touch panel is pressed from its end surface side, the touch panel is not to be pressed from an end face of the film. 
     The gasket  12  is formed of a member, which has elasticity and heat resistance, does not easily deteriorate, and is transformed without difficulty. The gasket  12  may be constructed from many different types of materials. Preferably, the gasket  12  is constructed from rubber such as silicone rubber etc. On the inner side of the housing, a sloping portion  13   a  in  FIG. 3A  is provided so that a corner portion of the gasket  12  is contacted thereto. 
     With reference to  FIGS. 3A ,  3 B and  3 C, the generation of pushing force to the end surface side (outward) of the touch panel through the gasket  12  in assembly will be described. 
       FIG. 3A  shows a state of the gasket  12  before it is assembled to the housing  13  by enlarging FIG.  2 . Assume that the touch panel  1  is to be pressed to the housing  13 . As shown in  FIG. 3B , when the metal frame  14  is pressed to the housing  13 , an inside corner  12   a  of the gasket  12  comes into contact with the sloping portion  13   a  located at the inside of the housing. When the metal frame  14  is further pressed to the housing  13 , the inside corner  12   a  is indented through the sloping portion  13   a  and transformed in a manner that the corner is extruded outward. That is, when the gasket  12  is pressed to the housing  13 , force f in a diagonal direction (force f 1  in a horizontal direction, force f 2  in a vertical direction) is applied from the sloping portion  13   a  to the inside corner  12   a . The force (tension) f 1  of the force f in a horizontal direction affects the film  1   a  of the touch panel  1  to be drawn outward. The force f 2  in a vertical direction affects the film  1   a  to be held so as to fix the touch panel  1 , and further acts so as to prevent moisture or dust from coming into the device. 
     An upper portion  14   a  of the frame  14  is formed low so as not to come into contact with the housing  13  in assembly. By providing a portion which is not supported by the frame  14 , the gasket  12  can be transformed easily when it is extruded outward. Note that a counterbore portion is provided at an inner side corner portion  12   b  of the gasket  12  so that the gasket  12  is formed so as not to contact with the end portion of the film  1   a  included in the touch panel  1 . 
     When the gasket  12  is assembled to the housing  13 , it may be considered that a dislocation in a positional relationship occurs owing to an error etc. and thus the inside corner  12   a  does not come into contact with the optimal portion of the sloping portion  13   a . To deal with this case, as shown in  FIG. 3C , the inside corner  12   a  moves along the sloping portion  13   a  until an upper surface of the gasket  12  comes into contact with a inside flat portion  13   b  of the housing  13  so that the positional relationship is corrected. By this correction, even when the positional relationship in assembly is not accurate one, the gasket is adjusted so as to hold the entire periphery of the touch panel  1  uniformly. 
     According to the constitution described in the first embodiment, the tension to draw outward is applied to the film  1   a  of the touch panel  1 . Therefore, swelling or corrugation can be prevented from occurring in the film. In addition, it is possible to prevent moisture or dust from coming into the device, and further possible to relieve an impact applied from the outside so as to prevent the device from being damaged. Furthermore, even there is a dislocation in a positional relationship in assembly, the gasket guides the touch panel to the proper position so that the entire periphery of the touch panel can be hold uniformly. 
     When the touch panel is fixed to the housing  13  by means of the metal frame  14 , the inside corner  12   a  of the gasket  12  is pressed against the sloping portion  13   a  of the housing  13  and thus transformed to be indented. This is because that some crushing is required to prevent water or dust from coming in. The effects of the crushing on swelling or corrugation in the film  1   a  of the touch panel  1  will be described. With reference to Table 2, deformation (the degree of crushing) of the gasket in assembling of the touch panel will be described. Table 2 shows an example of measurement results in a state where the touch panel is fixed in accordance with the structure described in the embodiment. That is, in assembling the touch panel to a device, it is assumed that the crushing degrees of the pressed inside corner  12   a  of the gasket  12  are 0.2, 0.4, 0.6 and 0.8 mm. Table 2 shows the results obtained by measuring the degree of swelling in the film  1   a  immediately after the assembly and the degree of swelling in the film  1   a  to which the acceleration test (for example, leaving the touch panel for twelve hours under the condition of the temperature of 70° C. and 85% of humidity in the atmosphere) is carried out after the assembly, respectively. TABLE 2 also shows the measurement result after carrying out the acceleration test to a touch panel having a conventional structure for the comparison. 
     
       
         
               
             
               
               
               
             
               
               
               
               
               
             
               
             
               
               
             
               
               
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
             
             
               
                 Swelling (mm) of Panel assembly in the Structure of the Present Invention 
               
             
          
           
               
                   
                 Degree of swelling (mm) 
                   
               
               
                   
                 (at the most swelled part) 
               
             
          
           
               
                 Degree of crush 
                 0.2 
                 0.4 
                 0.6 
                 0.8 
               
               
                   
               
               
                 Before the acceleration test 
                 0.161 
                 0.192 
                 0.279 
                 0.225 
               
               
                 After the acceleration test 
                 0.144 
                 0.176 
                 0.169 
                 0.177 
               
               
                 Change in swelling degree 
                 0.89  
                 0.92  
                 0.61  
                 0.79  
               
               
                   
               
             
          
           
               
                 Swelling (mm) of Panel assembly in the Conventional Structure 
               
             
          
           
               
                   
                 Degree of swelling (mm) 
               
               
                   
                 (at the most swelled part) 
               
             
          
           
               
                 Degree of crush 
                 0 
                 0.2 
                 0.4 
               
               
                   
               
               
                 Before the acceleration test 
                 0.189 
                 0.16  
                 0.158 
               
               
                 After the acceleration test 
                 0.219 
                 0.278 
                 0.305 
               
               
                 Change in swelling degree 
                 1.16  
                 1.74  
                 1.93  
               
               
                   
               
             
          
         
       
     
     From the results in Table 2, in the structure according to the present invention, the degree of swelling after carrying out the acceleration test tends to decrease as compared to the degree of swelling immediately after the assembly. In addition, it is found that the degree of swelling in the film is seldom influenced by the degree of crushing. Consequently, with a method of mounting the touch panel in accordance with the mechanism described in the present embodiment, even pressure is applied to the gasket so as to prevent moisture or dust from coming into the touch panel, the effect can be obtained in that no swelling or corrugation occurs in the film of the touch panel. 
     Next, as a second embodiment, a mechanism to prevent the occurrence of swelling or corrugation in a film of a touch panel mounted on an information terminal device will be described. The present embodiment is an embodiment in which a gasket, which is transformed from the gasket  12  described in the aforementioned first embodiment, is used.  FIGS. 5A ,  5 B show cross-sectional constitution of the gasket. In the above-described first embodiment, the sloping portion is provided on the inner side of the housing  13 . However, in this embodiment, such a sloping portion is not provided and tension to draw the touch panel outward through only the gasket. 
     As shown in  FIG. 5A , on an upper surface of a gasket  21  having a hook shaped cross-section, wedge-shaped projecting portions  22  ( 22   a ,  22   b ), each lying around the gasket in a frame-like manner, are provided. These projecting portions  22  are formed such that their outsides are oblique sides (acute angles) a and the insides are vertical sides b. Note that the vertical sides b may be oblique sides which have an larger angle than one of the oblique sides a (obtuse angles) and the same inclination direction as one of the oblique sides a. 
     As shown in  FIG. 5B , when the touch panel is assembled to the housing  23 , tip portions of the projecting portions  22  come into contact with the inner upper surface of the housing  23 . Being further pressed after contacting with the surface, the projecting portions  22  are transformed in a manner of being extruded outward, thereby force f 1  to draw the upper portion of the gasket  21  in a horizontal direction outward occurs. 
     Therefore, tension f 1  is applied to the film  1   a  of the touch panel  1  so that the film is drawn outward. Thus swelling or corrugation in the film can be prevented from occurring. In addition, it is possible to prevent moisture or dust from coming into the device, and further possible to relieve an impact applied from the outside so as to prevent the device from being damaged. Furthermore, the present embodiment can be carried out to the gasket only and thus can be applied easily to a conventional housing, which does not have a sloping portion. Therefore, the embodiment also has an effect on improvement of the conventional device. 
     Next, as a third embodiment, a mechanism to prevent the occurrence of swelling or corrugation in a film of a touch panel mounted on an information terminal will be described. Since the portable information terminal is an object to be described in the first and second embodiments, a gasket having a frame shape with a hook shaped cross-section is used therein while considering moderation of impact against a touch panel to be mounted on the terminal. However, in the present embodiment, a constitution is simple, considering waterproof and dustproof and regarding moderation of impact by means of a gasket has little importantanc. 
     As shown in  FIG. 6 , the touch panel  1  disposed on the liquid crystal display (LCD)  11  is supported by a metal frame (not shown) with a frame-like gasket  31  intervened between the housing  13  and the touch panel. The gasket  31  makes goes around the perimeter of the panel. The touch panel  1  is fixed in a manner of being pressed to the housing  13 . 
     When the gasket  31  is pressed by the housing  13 , force f is applied from the sloping portion  13   a  to the inside corner  12   a  in the same manner as one in the first embodiment. The force (tension)f 1  of the force f in a horizontal direction affects the film  1   a  of the touch panel  1  to be drawn outward. The force f 2  of the force f in a vertical direction affects the film  1   a  to be held so as to fix the touch panel  1 , and further acts so as to prevent water or dust from coming into the device. According to the embodiment, with a simple constitution, it is possible to prevent the occurrence of swelling or corrugation of the film, and prevent water or dust from coming in. 
     Next, as another embodiment, a mechanism to prevent the occurrence of swelling or corrugation in a film of a touch panel mounted on an information terminal will be described. Similarly to the above-described third embodiment, a constitution in the fourth embodiment is simple, considering waterproof and dustproof and regarding moderation of impact by means of a gasket has little importantance. 
     As shown in  FIGS. 7A ,  7 B, a frame-like gasket  42  having a wedge-shaped cross-section is mounted on an inner surface of an housing  41 . The gasket  42  is formed of rubber or sponge using the same material as one in the aforementioned gasket  12 . Using elastomer etc. as a material, the gasket can also be formed while integrating with the housing  41 . The touch panel  1  is supported by a metal frame (not shown) together with the LCD  11  and fixed in a manner of being pressed to the housing  41 . In this case, after contacting of a tip portion of the gasket  42  with the film  1   a , if the gasket  41  is further pressed to the film, it is transformed in a manner of being folded outward. Owing to this deformation, tension f 1  acting to draw the film  1   a  outward occurs. 
     According to the present embodiment, with a simple constitution, it is possible to generate the tension f 1  so as to prevent swelling or corrugation of the film from occurring, and further possible to prevent water or dust from coming in. 
     Next, as a fifth embodiment, a constitutional example of a mechanism, which prevents swelling or corrugation from occurring in a film of a touch panel included in an information input display device mounted on an information terminal, will be shown in FIGS.  8 A, 8 B and described. 
     In this constitution, a display device shown in  FIGS. 8A and 8B  is constituted by: a liquid crystal display elements  61 ; light guide  62 ; a touch panel  63  wherein input operation is executed by contact (pressure); a supporting section  64  which supports the liquid crystal display elements  61 , light guide  62 , and touch panel  63  in a integrated manner; a frame-like gasket  65  having a hook shaped cross-section, which interfits the above incorporated members around; and a sheet  66 , which is inserted between the touch panel  63  and gasket  65  when the gasket  65  interfits the incorporated members. The incorporated members are fixed to a housing  68  by means of a metal frame  67 . 
     As shown in  FIG. 8A , in a case where lighting etc. is arranged at an end portion of the light guide  62 , portions covered by the gasket  65  may not be sufficient to cover the touch panel. As a result, tension through the gasket  65  may have no affect. In addition, as shown in  FIG. 8B , in a case where an opening exists between the touch panel  63  and supporting section  64 , even if the opening exists slightly, the gasket  65  may not come into contact with the touch panel  63  sufficiently. As a result, water and dust can easily penetrate. 
     So, in the present embodiment, the sheet  66  is adhered to the touch panel  63  so as to eliminate the opening between the supporting section  64  and the touch panel  63 . In addition, the sheet  66  is adhered to a film  63   a  so as to cause tension generated in the gasket  65  to affect the film  63   a  sufficiently. Note that the sheet  66  can be formed of, for example, a resin material such as polyethylene terephthalate (PET) etc. However, it is not limited to that material. In the embodiment, it has been ascertained that sufficient tension is transmitted from the gasket  65  to the film  63   a  while using a sheet having about 0.3 mm of its thickness for the sheet  66 . 
     Consequently, according to the embodiment, the device is arranged such that a sheet is intervened between the touch panel and the gasket so as to enhance adhesion, with the result that generated tension is affected sufficiently. Thus, it is possible to prevent swelling or corrugation of the film from occurring, and further possible to prevent water or dust from coming in the device. 
     As having been described in detail above, according to the present invention, it is possible to provide an information input display device, which has a mechanism to perform a process of suppressing the occurrence of swelling or corrugation of a film included in an input section which is disposed on a display such as a liquid crystal display etc., and also has a mechanism to prevent swelling or corrugation from occurring in the case where the device is incorporated and fixed.