Abstract:
Provided is an electronic device that includes a touch panel configured to detect pressed coordinates and a pressing force from a change in capacitances, and a shape memory wire portion configured to restore its shape of shape memory wires by applying current through one nor more shape memory wires of a first layer and a second layer accordingly. A display is configured to display a normal image and a corrected image. In addition, a processor is configured to provide a corrected image for a location of the touch panel which is currently being touched and to apply a current to the shape memory wire portion to restore the shape memory wire portion to an original shape.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims under 35 U.S.C. §119(a) the benefit of Japanese Patent Application No. 2012-152584 filed on Jul. 6, 2012, the entire contents of which are incorporated herein by reference. 
       BACKGROUND 
       [0002]    (a) Technical Field 
         [0003]    The present invention relates to an electronic device including a touch panel and a display, which is touch sensitive and is deformable by finger pressing manipulation. 
         [0004]    (b) Background Art 
         [0005]    Recently, mobile phones have begun to adopt touch screen technology in which the display also functions as an input. Such a function is implemented by applying an input means on top of the display panel called a touch panel. The touch panel is touch sensitive and recognizes when a user&#39;s, finger for example, comes in contact with the panel and inputs position information associated with the movement of the pen or finger across or on the touch panel. Redundant arrangement of buttons can be avoided and electronic devices having elegant designs can be provided due to the current state of the technology. However, since the touch panel is still flat, there is still no way to improve the sense of touch perceived by the user. 
         [0006]    That is, unlike the normal keyboard of a desktop computer or the conventional type of a mobile phone where each alphabetic letter can be distinguished from another letter due to the presence of a certain projection/protrusion and/or between them and from the bottom surface, the surface of the touch panel is smooth surface without such projection/protrusion or a distinguishable partition. Therefore, it is not possible to improve the sense of touch perceived by a user. 
         [0007]    Additionally, the electronic device proposed in Patent Document 1 is shown in  FIG. 7 . As shown in  FIG. 7 , a shape memory wire in the form of a coil spring is installed at four corners on the bottom inside a frame, and a display and a touch panel are overlaid on the shape memory wires. A processor turns on/off current of the shape memory wires to control expansion and contraction. For example, the shape memory wire may be configured to contract if current flows. In this way, the entire surface of the display and the touch screen is moved. With such a structure, (a) a frame is required to allow the shape memory wire to expand and contract; (b) both of the display and the touch screen are pressed down and then restored; and (c) only an instruction of a single event is valid. 
         [0008]    The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. 
       SUMMARY OF THE DISCLOSURE 
       [0009]    Accordingly, the present invention has been made to solve the foregoing problem, and provides an electronic device which is capable of local deformation and multi-point input and also miniaturization, reduced thickness and an excellent sense of touch. 
         [0010]    According to an aspect of the present invention, there is provided an electronic device (touch panel display unit) that includes a touch panel having an X-axis position detecting conductive layer, a Y-axis position detecting conductive layer, and a pressed position detection circuit configured to detect pressed coordinates and a pressing force from a change in capacitances. The electronic device also includes a shape memory wire portion that has a shape-memory-wire first layer deposited on the touch panel in which a plurality of shape memory wires are arranged towards one side, a shape-memory-wire second layer in which a plurality of shape memory wires are arranged orthogonally to the first layer, and an actuator that is configured to restore the shapes of the shape memory wires deformed by flowing current through the shape memory wires of the first layer and the second layer accordingly. In addition, the electronic device also has a display (e.g., screen) that is configured to display a normal image and a corrected image, as well as a processor that is configured to transmit a normal image held in a memory device to the display, receive the pressed coordinates and pressing force from the touch panel and store the pressed coordinates and the pressing force in the memory device, generate a corrected image at the pressed position based on the pressing force and transmit the corrected image to the display, and instruct the actuator to conduct current through the shape memory wires whose shapes are to be restored. 
         [0011]    The shape memory wires of the shape-memory-wire first layer and the shape-memory-wire second layer may be arranged in a latticed pattern, and the X-axis position detecting conductive layer and the Y-axis position detecting conductive layer may be arranged on the lattice in a zigzag pattern when viewed from top. 
         [0012]    The processor may also be configured to instruct the actuator to restore a shape of a portion deformed by pressing for an arbitrary amount of time based the amount of force that is applied at a particular position on the touch panel. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]    The above and other features of the present invention will now be described in detail with reference to an exemplary embodiment thereof illustrated the accompanying drawings which are given hereinbelow by way of illustration only, and thus are not limitative of the present invention, and wherein: 
           [0014]      FIG. 1  is a block diagram showing a basic schematic structure of the control mechanism associated with the exemplary embodiment of the present invention; 
           [0015]      FIG. 2  is a descriptive diagram of a shape memory wire portion and a touch panel shown in  FIG. 1 ; 
           [0016]      FIGS. 3A-C  is a descriptive diagram showing a change in the shape of a shape memory wire; 
           [0017]      FIG. 4  is an enlarged diagram of a portion A shown in  FIG. 2 , viewed from top; 
           [0018]      FIG. 5  is a diagram showing a structure of an electronic device according to an exemplary embodiment of the present invention; 
           [0019]      FIG. 6  is a diagram showing a detailed structure of a touch panel including a shape memory wire shown in  FIG. 5 ; and 
           [0020]      FIG. 7  is a structural diagram of a conventional electronic device. 
       
    
    
     DETAILED DESCRIPTION 
       [0021]    Hereinafter, an electronic device according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings to allow those of ordinary skill in the art to easily carry out the present invention. While the invention will be described in conjunction with the exemplary embodiment, it will be understood that present description is not intended to limit the invention to the exemplary embodiment. On the contrary, the invention is intended to cover not only the exemplary embodiment, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims. 
         [0022]    The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
         [0023]    Furthermore, the control logic of the present invention may be embodied as non-transitory computer readable media on a computer readable medium containing executable program instructions executed by a processor, controller or the like e.g., within the MCU  14  and the IPS device  12 . Examples of the computer readable mediums include, but are not limited to, ROM, RAM, compact disc (CD)-ROMs, magnetic tapes, floppy disks, flash drives, smart cards and optical data storage devices. The computer readable recording medium can also be distributed in network coupled computer systems so that the computer readable media is stored and executed in a distributed fashion, e.g., by a telematics server or a Controller Area Network (CAN). 
         [0024]    Although the below exemplary embodiment is described as using a single controller/processor to perform the above process, it is understood that the above processes may also be performed by a plurality of controllers/processors. 
         [0025]      FIG. 1  is a block diagram showing a basic schematic structure of the control mechanism associated with the exemplary embodiment of the present invention. As shown in  FIG. 1 , the electronic device according to the present invention includes a controller and a display unit. In the controller  3  is installed a processor  10  and a memory device  9 . The display unit  4  includes a touch panel  1 , a shape memory wire portion  2 , and a display  7  (e.g., a liquid crystal display (LCD) or light emitting diode (LED) screen). The touch panel  1  has a separate circuit for screening the pressing position of the touch panel embedded therein, calculates coordinates pressed and a pressing force by a finger, etc., and outputs the calculated coordinates and a pressing force to the processor  10 . 
         [0026]    The shape memory wire portion  2  includes a shape-memory-wire first layer  2   a  in which a plurality of shape memory wires are arranged toward one side, a shape-memory-wire second layer  2   b  in which a plurality of shape memory wires are arranged orthogonally to the first layer  2   a , and an actuator  2   c  which restores the shapes of the shape memory wires deformed by current flowing to the shape memory wires of the first layer  2   a  and the second layer  2   b . The memory device  9  in the controller  3  stores the pressed coordinates and a pressing force of e.g., a finger coming in contact with the display unit  4 . The memory device  9  typically also stores a plurality of images as well. 
         [0027]    The processor  10  in the controller  3  is configured/programmed to transmit a normal image held in the memory device  9  to the display  7 , receive one or more pressed coordinates and the pressing force from the touch panel  1  and store the pressed coordinates and pressing force in the memory device  9 . The process is also configured to generate a corrected image at a pressed position based on the pressing force and transmits the generated image to the display  7 , and instructs the actuator  2   c  of the shape memory wire portion  2  to conduct a shape memory wire whose shape is to be restored. The display  7  displays the corrected image or the normal image. 
         [0028]      FIG. 2  is a descriptive diagram of the shape memory wire portion  2  and the touch panel  1  shown in  FIG. 1 . From top to bottom in  FIG. 2 , four layers, that is, a transparent conductive layer  1   a  for detecting an X-axis position, the shape-memory-wire first layer  2   a , a transparent conductive layer  1   b  for detecting a Y-axis position, and the shape-memory-wire second layer  2   b  are deposited. The X-axis position detecting transparent conductive layer  1   a  and the Y-axis position detecting transparent conductive layer  1   b  are connected to a pressed position detection circuit  1   c . The shape-memory-wire first layer  2   a  and the shape-memory-wire second layer  2   b  are connected to the actuator  2   c.    
         [0029]      FIGS. 3A-C  is a descriptive diagram showing a change in the shape of a shape memory wire  5 . Generally, the shape memory wire  5 , as shown in  FIG. 3A , illustrate a state in which the power is not connected. For this reason, the shape memory wire  5  is deformed when a finger touches or presses on the touch panel. Such deformation improves the sense of touch when compared to pressing on a hard flat inflexible surface. 
         [0030]    Once the processor  10  instructs the actuator  2   c  to provide current therein to reform the shape memory wire  5  back into its designated shape, the shape memory wire  5  returns to its designated shape (e.g., flat) as shown in  FIG. 3B . That is, the shape memory wire  5  is powered up and thus is restored to its original shape. That is, wires manufactured using Ti—Ni, etc., have the shape memory effect (SME) of emitting heat thereby restoring the original shape as the current flows thereon. A cross-section of the shape memory wire  5  may be covered with a transparent elastic material  6  around its circumference, as shown in  FIG. 3C . Without being limited to the foregoing example, a plurality of shape memory wires  5  may also be inserted between transparent elastic material  6  in the shape of two separate sheets. 
         [0031]      FIG. 4  is an enlarged diagram of a portion A shown in  FIG. 2 , viewed from top. The shape memory wires  5  of the shape-memory-wire first layer  2   a  and the shape-memory-wire second layer  2   b  are arranged to be orthogonal to each other, that is, in a latticed manner. At least one side of the lattice may be about 5 mm, and the interval between conductive layers may be about 1 mm. Corresponding to the lattice, the X-axis position detecting transparent conductive layer  1   a  and the Y-axis position detecting transparent conductive layer  1   b  may be arranged in a zigzag pattern when viewed from above. The X-axis position detecting transparent conductive layer  1   a  or the Y-axis position detecting transparent conductive layer  1   b  may be an element whose capacitance is changed when the element is touched by, e.g., a finger. 
         [0032]      FIG. 5  is a diagram showing a structure of the electronic device/touch panel display unit according to the exemplary embodiment of the present invention. As shown in  FIG. 5 , the shape memory wire portion  2  is embedded in the touch panel  1 . Under the touch panel  1  is disposed the display  7  under which a backlight unit  8  is disposed. For effectiveness of deformation of the shape memory wire portion  2 , a predetermined interval is preferably provided between a layer of the touch panel  1  and the shape memory wire portion  2  and a layer of the display  7 . When a self-light-emitting element such as an organic electroluminescence (EL) element is used, the display  7  may have a spherical surface or a convex surface. 
         [0033]      FIG. 6  is a diagram showing a detailed structure of the touch panel  1  including the shape memory wire portion  2  shown in  FIG. 5 . As shown in  FIG. 6 , a bottom layer in which intermediate layers and the shape memory wires  5  are arranged in an X-axis direction; a layer of an X-axis position detecting transparent conductive layer; a layer in which an intermediate layer and the shape memory wires  5  are arranged in a Y-axis direction; and the Y-axis position detecting transparent conductive layer are sequentially deposited from bottom to top. 
         [0034]    According to the present invention, by disposing shape memory wires in a latticed pattern, local pressing is possible. Thus, for example, a plurality of buttons may be displayed, a position corresponding to each button may be pressed, a pressed portion may be locally deformed, and the sense of touch can be improved. That is, application to a touch panel capable of multi-point input is possible. Even when the shape memory wire is deformed by pressing, the touch panel can be restored to its original shape by current flowing therethrough, thereby maintaining a contact surface of the touch panel. The shape memory wire does not extend in a vertical direction like a coil spring, and is arranged on a surface, thereby achieving miniaturization and reduced thickness. The processor generates a corrected image based on a pressing force of each point, thus preventing a distorted image from being displayed on the display while still allowing the user to feel or sense the screen actually being touched. 
         [0035]    The shape-memory-wire first layer and second layer may also be arranged in a latticed pattern, and the X-position detecting transparent conductive layer and the Y-axis position detecting transparent conductive layer may be arranged in a zigzag pattern on the lattice, when viewed from above, to prevent detection of capacitances of the first layer and the second layer from overlapping. In addition, precision of a pressed position of a finger, etc., can be guaranteed. 
         [0036]    Moreover, the processor may control shape restoration of a portion deformed by pressing the actuator for an arbitrary amount of time based the amount of force that is applied at a particular position on the touch panel, thereby rapidly restoring the shape of the shape memory wire. In particular, the arbitrary amount of time is the amount of time it takes to change from on job application using the display to another. 
         [0000]    
       
         
               
             
               
               
             
           
               
                   
               
               
                 [Description of Reference Numerals] 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 1: Touch Panel 
                 1a: X-Axis Position Detecting 
               
               
                   
                 Transparent Conductive Layer 
               
               
                 1b: Y-Axis Position Detecting 
                 1c: Pressed Position Detection Circuit 
               
               
                 Transparent Conductive Layer 
               
               
                 2: Shape Memory Wire Portion 
                 2a: First Layer 
               
               
                 2b: Second Layer 
                 2c: Actuator 
               
               
                 3: Controller 
                 4: Display Unit 
               
               
                 5: Shape Memory Wire 
                 6: Transparent Elastic Material 
               
               
                 7: Display 
                 8: Backlight 
               
               
                 9: Memory Device 
                 10: Processor