Patent Publication Number: US-2015070308-A1

Title: Display device with touch detection function, electronic apparatus provided with display device, and cover member of display device

Description:
CROSS REFERENCES TO RELATED APPLICATIONS 
     The present application claims priority to Japanese Priority Patent Application JP 2013-187710 filed in the Japan Patent Office on Sep. 10, 2013, the entire content of which is hereby incorporated by reference. 
     BACKGROUND 
     1. Field of the Invention 
     The present invention relates to a display device with touch detection function, an electronic apparatus provided with the display device, and a cover member of the display device. 
     2. Description of the Related Art 
     In recent years, there has been paid much attention to a touch detection device capable of detecting a target which may be an external object approaching the device itself. Such a touch detection device may be called a “touch panel” and the like. For example, the touch detection device may be used as a device to input information when combined with a display device to display various images for inputting the information. Thus, by combining such a touch detection device with such a display device, it becomes possible to input information without a conventional input device, for example, a keyboard, a mouse, a keypad and the like. 
     As a type of touch detection devices, there are known an optical type, a resistor type, an electrostatic capacity type and so on. An electrostatic capacity type of touch detection devices has a relatively simple structure and allows low power consumption. This type of touch detection devices may be used for mobile phones or mobile terminals. For example, Japanese Patent Application Laid-open Publication Nos. 2011-233018 and 2012-047807 describe an electrostatic capacity type of touch detection devices. 
     When information is input via an operation of a mechanical button, an operator/user can input the information while viewing the mechanical button. The operator/user can also input the information without viewing the mechanical button so long as he/she can feel the mechanical button via his/her finger. When information is input via an operation on a display plane of a display device with touch detection function, however, the operator/user may not easily input the information unless viewing the display plane. There is often the case where information should be input without viewing the display plane of the display device. Thus, there is a need for a display device with touch detection function allowing the operator/user to easily input information via an operation on a display plane of the display device without viewing the display plane. 
     In light of the foregoing, it is desirable to provide a display device with touch detection function that allows the user to facilitate information input operation even if the user cannot view a display plane. 
     SUMMARY 
     According to an aspect of the present disclosure, a display device with touch detection function includes: a display panel including a display plane for displaying images and an electrostatic capacitance type touch detection device; a cover member stacked on the display plane of the display panel, the cover member having at least one recess portion and/or projection portion on the side of a touch surface opposite to a plane that faces the display panel; and a controller configured to send a signal upon the touch detection device detects a variance of electrostatic capacitance proximity to the at least one recess portion and/or projection portion. 
     According to another aspect of the present disclosure, an electronic apparatus includes the display device with touch detection function. The electronic apparatus of the present disclosure may be a television device and a mobile terminal device, such as a digital camera, a laptop computer, a video camera or mobile phone and so on. 
     Therefore, the display device with touch detection function  1  allows the user to facilitate information input operation on the display plane even if the user cannot view the display plane. 
     Additional features and advantages are described herein, and will be apparent from the following Detailed Description and the figures. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         FIG. 1  is a schematic exploded view illustrating a display device with touch detection function according to an embodiment 1; 
         FIG. 2  is a schematic front view of a cover member according to the embodiment 1; 
         FIG. 3  is a schematic back view of a cover member according to the embodiment 1; 
         FIG. 4  is a A-A′ cross-sectional view of  FIG. 1 ; 
         FIG. 5  is a A-A′ cross-sectional view of  FIG. 1  when using a transparent film to provide a recess portion; 
         FIG. 6  is a schematic block diagram illustrating a relationship between a touch detection device and a controller; 
         FIG. 7  is a schematic exploded view illustrating a display device with touch detection function according to an embodiment 2; 
         FIG. 8  is a B-B′ cross-sectional view of  FIG. 7 ; 
         FIG. 9  is a B-B′ cross-sectional view of  FIG. 7  when using a transparent film to provide a projection portion; 
         FIG. 10  is a schematic perspective view of a cover member according to a modification 1; 
         FIG. 11  is a schematic perspective view of a cover member according to a modification 2; 
         FIG. 12  is a schematic perspective view of a cover member according to a modification 3; and 
         FIG. 13  is an exemplary view of an electronic apparatus to which a display device with touch detection function according to the embodiments and modifications is applied. 
     
    
    
     DETAILED DESCRIPTION 
     Exemplary embodiments for implementing the present disclosure will be explained in detail below with reference to the accompanying drawings. The present disclosure is not limited by the contents described in the following embodiments. In addition, the components described as follows include those which can be easily conceived by persons skilled in the art and those which are substantially equivalent thereto. Moreover, the components described as follows can be arbitrarily combined with each other. The explanation is performed in the following order. 
     1. Embodiments (Display Device with Touch Detection Function) 
     1-1. Embodiment 1 
     1-2. Embodiment 2 
     2. Application Examples (Electronic Apparatus) 
     Examples of electronic apparatus to which the display device with touch detection function according to any of embodiments is applied. 
     3. Configuration of Present Disclosure 
     1. EMBODIMENTS 
     Display Device with Touch Detection Function 
     1-1. Embodiment 1 
       FIG. 1  is an exploded view illustrating a display device with touch detection function according to the embodiment 1.  FIG. 2  is a front view illustrating a cover member of the display device according to the embodiment 1.  FIG. 3  is a back view illustrating the cover member of the display device according to the embodiment 1. As illustrated in  FIG. 1 , a display device with touch detection function  1  includes a liquid crystal panel  30  as a display panel, a buffer layer  20 , and a cover member  10 . The display device with touch detection function  1  may include an organic EL (Electroluminescence) module instead of the liquid crystal panel  30 . 
     The liquid crystal panel  30  includes a liquid crystal layer between two transparent substrates. The liquid crystal panel  30  according to the embodiment I is a FFS (Fringe Field Switching) type liquid crystal panel. One transparent substrate carries a drive electrode and pixel electrodes arranged in a matrix corresponding to pixels. The drive electrode and pixel electrodes are formed in a layered structure on the substrate. At least one of the two transparent substrates carries color filters such as R (Red) filter, G (Green) filter and B (Blue) filter arranged correspondingly to pixels. The liquid crystal panel  30  has openings formed on pixel electrodes or the drive electrode. An electric field leaked through openings (such an electric field is called “fringe electric field”) drives the liquid crystal of the liquid crystal layer. The liquid crystal panel  30  displays an image by switching a light transmission state and a light shutoff state at each pixel on the basis of image signals. The liquid crystal panel  30  may be of an IPS (In-plane Switching) type, a TN (Twisted Nematic) type, an OCB (Optically Compensated Bend or Optically Compensated Birefringence) type, or an ECB (Electrically Controlled Birefringence) type. The liquid crystal panel  30  may employ a normally black mode which displays black by shutting off light when supplied with no electric voltage. The liquid crystal panel  30  may employ a normally white mode which displays white by transmitting light when supplied with no electric voltage. 
     The liquid crystal panel  30  includes a touch detection device  40  which is of an electrostatic capacity type. For example, the touch detection device  40  may include a plurality of drive electrodes arranged in a plane, and a plurality of detection electrodes arranged in a plane different from the plane in which the plurality of drive electrodes arranged. The plurality of drive electrodes extend in a first direction, respectively, and aligned with each other in a second direction crossing the first direction. The plurality of touch detection electrodes extend in the second direction, respectively, and aligned with each other in the first direction. Each of the touch detection electrodes crosses the plurality of drive electrodes with a predetermined gap. In other words, each of the plurality of the touch detection electrodes crosses the plurality of drive electrodes with spaced apart respectively in a third direction perpendicular to both the first and the second directions. An electrostatic capacity arises at intersections where the drive electrodes cross the touch detection electrodes. 
     The touch detection device  40  includes a touch detection portion electrically connected to the touch detection electrodes. A variance in the electrostatic capacity arisen at a position where each of the drive electrodes cross the touch detection electrodes is input as a touch detection signal to the touch detection portion. From among positions where the drive electrodes cross the touch detection electrodes, the touch detection portion detects, on the basis of the touch detection signal, a position where the electrostatic capacity varies. On the basis of the touch detection signal, the touch detection portion identifies a position where the subject is in contact with or close to the touch detection device  40 . Hereinafter, a situation or event where the subject is in contact with or close to the touch detection device  40  may be referred to as “touch” appropriately. 
     In the embodiment 1, a touch is detected on the basis of a variance in the electrostatic capacity at a position where a drive electrode crosses a touch detection electrode with spaced apart in the third direction and are opposed to each other. However, a position where any electrostatic capacity arises is not limited thereto. For example, the touch detection device  40  may detect a touch on the basis of an electrostatic capacitance arisen between a conductor extended from the drive electrodes and a conductor extended from the touch detection electrodes where both the conductors are aligned with each other on the same plane. That is, the touch detection device  40  may detect a touch on the basis of an electrostatic capacity arisen between a drive electrode and a touch detection electrode. 
     The buffer layer  20  is interposed between the liquid crystal panel  30  and the cover member  10 . For example, the buffer layer  20  may be an optical elastic resin whose refractive index is the same as the refractive index of the cover member  10  and the same as the refractive index of the transparent substrate of a liquid crystal panel  30 . Since the optical elastic resin has elasticity, the buffer layer  20  can alleviate an external impact and lower a risk of damage of the liquid crystal panel  30 . Since the optical elastic resin has the refractive index the same as the refractive index of the cover member  10  and the refractive index of the liquid crystal panel  30 , it is possible to reduce the light reflection at an interface between the cover member  10  and the optical elastic resin and an interface between the optical elastic resin and the liquid crystal panel  30 . The buffer layer  20  may be an air gap. When the buffer layer  20  is made of the optical elastic resin, however, the refractive index of the buffer layer  20  can be the same as the refractive index of the cover member  10  and the refractive index of the liquid crystal panel  30 . Therefore, it is preferable that the buffer layer  20  is made of the optical elastic resin. It is not necessary that the refractive index of the buffer layer  20  is the same as the refractive index of the cover member  10  and the refractive index of the liquid crystal panel  30 . The buffer layer  20  may have a refractive index around the refractive index of the cover member  10  and the refractive index of the liquid crystal panel  30 . 
     In the embodiment 1, for example, the optical elastic resin has characteristics that it is cured or hardened when heated. Accordingly, the characteristics, the liquid crystal panel  30  is adhered to the cover member  10  via the optical elastic resin by heating the optical elastic resin which is interposed between the liquid crystal panel  30  and the cover member  10 . The optical elastic resin may have characteristics that it is cured or hardened when subjected to UV light. 
     The cover member  10  is stacked on a display plane (a plane for displaying an image) side of the liquid crystal panel  30  and protecting the display plane of the liquid crystal panel  30 . For example, the cover member  10  may be made of glass and has a square shape when viewed from a vertical direction relative to the display plane. The cover member  10  has recess portions  11 ,  12 ,  13  on the side of the touch surface  10   f  which is opposed to a plane that faces the liquid crystal panel  30 . Because the touch detection device  40  is of the electrostatic capacitive type, it is possible to detect that the object comes into touch or close to the touch surface  10   f . For example, the object may be a finger of human-being. As illustrated in  FIG. 3 , the back plane is a plane that faces the liquid crystal panel  30  of the cover member  10 , is flat and contacts with the buffer layer  20 . The cover member  10  can protect a surface of the liquid crystal panel  30 . The material of the cover member  10  may include various materials with transparent characteristics, such a transparent resin. The cover member  10  may have squire or circular shape when viewed from a vertical direction relative to the display plane. 
     As illustrated in  FIG. 3 , when viewed from a vertical direction relative to the touch surface  10   f , the recess portions  11 ,  13  of the embodiment 1 has a circle shape, and the recess portion  12  has substantial rectangular shape. In the following, shape viewed from a vertical direction relative to the touch surface  10   f  simply refers to as a “2-dimensional shape.” The recess portion  12  is located between the recess portions  11  and  13 . The direction of a longitudinal side of the recess portion  12  is parallel to a direction of a linear line passing centers of the recess portions  11 ,  13 . The recess portions  11 ,  12  and  13  may be located along the longitudinal side of the cover member  10  as well as located closer to the longitudinal side of the touch surface  10   f  than a center thereof. 
     Arrangement of the recess portions  12  and  13  are not limited thereto. For example, recess portions  11 ,  12  and  13  may be located along a traverse side of the cover member  10 . Alternatively, the recess portions  11 ,  12  and  13  may be located at the center of the touch surface  10   f . It is, however, preferable that the recess portions are located close to the longitudinal or traverse side away from the center of the touch surface  10   f  because the recess portions  11 ,  12  and  13  are less vivid desirably. The cover member  10  may include the recess portions  11 ,  12  and  13 . For example, one of the recess portions  11 ,  12  and  13 , or combination of two of the recess portions  11 ,  12  and  13  may be formed on the cover member  10 . 
       FIG. 4  illustrates a A-A′ cross-sectional view of  FIG. 1 . As illustrated in  FIG. 4 , the recess portion  12  may be a groove with a dimension L1 in depth. Thereby, the user can recognize the position of the recess portion  12  by touching the edge of the recess portion  12 . For example, the recess portion  12  is formed by ablating the touch surface  10   f . For example, dimension L1 may be 0.1 mm. It is preferable that dimension L1 is from 0.02 mm to 0.5 mm. In the case where dimension L1 is greater than 0.02 mm, the cover member  10  improves the possibility that the human being can recognize the recess portion with his/her sense of finger. In the case where dimension L1 is not more than 0.5 mm, the cover member  10  decreases the possibility that the recess portion  12  interferes with a visibility of the image displayed via the liquid crystal panel  30 . Although the recess portion  12  has been described above, the same description may be also applied to other recess portions  11  and  13 . Thus, the display device with touch detection function  1  allows the user to recognize each position of the recess portions  11 ,  12  and  13  by touching the recess portions  11 ,  12  and  13  without viewing the display plane of the liquid crystal panel  30 . 
     Although the recess portions  11 ,  12  and  13  according to the embodiment 1 are formed by ablating the touch surface  10   f , the recess portions  11 ,  12  and  13  may be provided by transparent film.  FIG. 5  illustrates A-A′ cross-sectional view of  FIG. 1  where the recess portions are formed with transparent film. In this case, a transparent film F1 includes substantially rectangular through hole. The through hole overlaps a part of the touch surface  10   f . Side wall of the recess portion  12  configures a cross-section of the through hole as well as a cross-section of the transparent film F1. For example, the transparent film F1 may be made of polyethylene terephthalate and the like, function as an anti-scattering film with dimension L1 in thickness. The transparent film F1 allows the user to recognize the position of the recess portion  12  by touching the edge of the recess portion  12  of the transparent film F1. The transparent film F1 includes two of circular through holes. The side wall of the recess portion  11  configures cross section of one through hole of the two of circular through holes. The side wall of the recess portion  13  configures cross section of the other through hole of the two of circular through holes. Thus, the display device with touch detection function  1  allows the user to recognize each position of the recess portions  11 ,  12  and  13  by touching the recess portions  11 ,  12  and  13  without viewing the display plane of the liquid crystal panel  30 . The transparent film F1 can provide the display device with touch detection function  1  with recession portions  11 ,  12  and  13  much easier than ablating the touch surface  10   f . The side wall of the recess portions  11 ,  12  and  13  may include at least part of cross section of the transparent film F1. For example, one part of side wall of the recess portions  11 ,  12 ,  13  may be configured by cross section of the transparent film F1, and the other part of side wall of the recess portions  11 ,  12 ,  13  may be configured by a housing and the like which encloses the display device with touch detection function  1 . 
       FIG. 6  is a block diagram illustrating a relationship between a touch detection device and a controller. The display device with touch detection function  1  includes a controller  50  which is connected to a touch detection device  40 . The electrostatic capacitance of a portion where the user brings his/her finger into touch or close to the touch surface  10   f  varies. When the touch detection device  40  detects the variance of the electrostatic capacitance proximate to either the recess portions  11 ,  12  and  13 , the controller  50  can output a signal in accordance with input function assigned to the recess portion. Furthermore, the controller  50  can change an output signal according to locus of a position where the touch detection device  40  detects the variance of electrostatic capacitance. Furthermore, when the touch detection device  40  detects the variance of the electrostatic capacitance proximate to neither the recess portions  11 ,  12  and  13 , the controller  50  does not output a signal according to input function assigned to each of the recess portions. The position proximate to the recess portion is defined as a portion of the touch detection device  40 , which corresponds to an edge of the recess portion, an inner portion from the edge of the recess portion or an outer peripheral portion of the edge of the recess portion. 
     The controller  50  includes a position/shape memory  51 , a locus memory  52 , a comparator  53  and an output device  54 , and is connected to both a touch detection device  40  and a device controller  60 . The controller  50 , for example, may be a microcomputer including CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), and I/O interface circuit (Input/output device). The position/shape memory  51  can store, for example, information associated with a position and 2-dimensional shape of each of the recess portions  11 ,  12  and  13  in accordance with information stored in the RAM as a memory. The locus memory  52  is a function which is realized by the CPU, ROM and RAM, and stores, for example in RAM as a memory, locus of a position where the touch detection device  40  detects the variance of electrostatic capacitance, which is calculated with the CPU. The comparator  53  is a function which is realized by the CPU, ROM and RAM, and compares information of a position where the touch detection device  40  detects the variance of electrostatic capacitance and information stored in the position/shape memory  51 . Furthermore, the comparator  53  compares information stored in the locus memory  52  and information associated with a position and 2-dimensional shape of each of the recess portions  11 ,  12  and  13 , which is stored in the position/shape memory  51 . The output device  54  is a function which is realized by the CPU, ROM, RAM and I/O interface circuit, send a signal in response to the result of comparison to a device controller  60 . 
     For example, the controller  50  captures information of a position where the touch detection device  40  detects the variance of electrostatic capacitance in a periodic manner of a predetermined time interval. The comparator  53  compares a position where the touch detection device  40  detects the variance of electrostatic capacitance and a position of recess portions  11 ,  12 ,  13  stored in the position/shape memory  51 . As a result of the comparison, if the touch detection device  40  has detected a variance of electrostatic capacitance proximate to either the recess portions  11 ,  12  or  13 , the comparator  53  causes the output device  54  to output a signal. The output device  54  sends to a device controller  60  a signal which controls an operation of the liquid crystal panel  30 . For example, upon receiving a signal from the output device  54 , the device controller  60  takes the liquid crystal panel  30  into the state awaiting for change of the signal. 
     The locus memory  52  calculates locus of a position where the touch detection device  40  has detected the variance of electrostatic capacitance on the basis of information received from the touch detection device  40  and stores the locus in itself. The locus of a position where the touch detection device  40  has detected the variance of electrostatic capacitance based on information received from the touch detection device  40  is, for example, a representative of finger movement on the touch surface  10   f . Furthermore, the locus memory  52  calculates a moving rate and a moving direction of a position where the touch detection device  40  has detected the variance of electrostatic capacitance on the basis of information received from the touch detection device  40  and time when the information has been received therefrom, and stores the results in itself. If the comparator  53  makes a determination that the detection device  40  has detected a variance of electrostatic capacitance proximate to either the recess portions  11 ,  12  or  13 , the comparator  53  compares 1) locus of a position, stored in the locus memory  52 , where the touch detection device  40  has detected the variance of electrostatic capacitance and 2) 2-dimensional shape of the recess portion that is the closest to the position where the touch detection device  40  has detected the variance of electrostatic capacitance among the recess portions  11 ,  12  and  13 , which is stored in the position/shape memory  51 . As a result of the comparison, if the locus tracks the 2-dimension shape, the comparator  53  changes a signal output from the output device  54  in accordance with a moving rate and a moving direction of a position, stored in the locus memory  52 , where the touch detection device  40  has detected the variance of electrostatic capacitance. In this way, the controller  50  changes a signal output from the output device  54  in accordance with the locus of a position where the touch detection device  40  has detected the variance of electrostatic capacitance. The device controller  60  controls the liquid crystal panel  30  in accordance with a change of the signal output from the output device  54 . The subjective device to be controlled by the device controller  60  may be an external device such as an audio component set or an air conditioner and the like. 
     The device controller  60  controls the liquid crystal panel  30  to zoom in or zoom out the display image in accordance with variation of the signal output from the output device  54 , for example. The device controller  60  may control the liquid crystal panel  30  to adjust luminance of the display device or scroll displayed image in accordance with the change of the signal output from the output device  54 . The device controller  60  may control an external device such as the audio component set to adjust a volume of the audio and/or select a tune in accordance with the change of the signal output from the output device  54 . The device controller  60  may control an external device such as the air conditioner to adjust preset temperature and/or air flow rate thereof in accordance with a change of the signal output from the output device  54 . Upon the detection device  40  has detected a variance of electrostatic capacitance proximate to either the recess portions  11 ,  12  or  13 , the device controller  60  may control the liquid crystal panel  30  to display several types of images for input on the liquid crystal panel  30 , which correspond to the recess portions  11 ,  12  and  13 . 
     As described above, 2-dimensional shape of the recess portion  11  is circle. When the user brings his/her finger into touch or close to the touch surface  10   f , the detection device  40  detects a position where electrostatic capacitance varies. The comparator  53  compares a position where the touch detection device  40  has detected the variance of electrostatic capacitance and a position of each of the recess portions  11 ,  12  and  13  stored in the position/shape memory  51 . For example, when the user brings his/her finger into touch or close to the recess portion  11 , as a result of the comparison, the comparator  53  makes a determination that the touch detection device  40  has detected the variance of electrostatic capacitance proximity to the recess portion  11 . Then, followed by moving the finger along the edge of the recess portion  11 , the locus memory  52  calculates locus of a position where the touch detection device  40  has detected the change of electrostatic capacitance on the basis of information received from the touch detection device  40 , and stores the circle like locus in itself. Furthermore, the locus memory  52  calculates a moving rate and a moving direction of a position where the touch detection device  40  has detected the variance of electrostatic capacitance on the basis of information received from the touch detection device  40  and time when the information has been received therefrom, and stores the results in itself. If the comparator  53  makes a determination that the detection device  40  has detected a variance of electrostatic capacitance proximate to recess portion  11 , the comparator  53  compares the circular locus stored in the locus memory  52  and 2-dimensional shape of the recess portion  11  stored in the position/shape memory  51 . As a result of the comparison, because the finger moves along the edge of recess portion  11 , the comparator  53  makes a determination that the circular locus tracks the 2-dimensional shape of recess portion  11 . Then, the comparator  53  changes a signal output from the output device  54  in accordance with a moving rate and a moving direction of a position where the touch detection device  40  has detected the variance of electrostatic capacitance. In this way, the controller  50  changes a signal output from the output device  54  in accordance with the locus of a position where the touch detection device  40  has detected the variance of electrostatic capacitance. The device controller  60  controls the liquid crystal panel  30  to adjust luminance of the display device in accordance with change of the signal output from the output device  54 . 
     The subject to be changed by the device controller  60  is not limited to the luminance of the display. 
     As described above, 2-dimensional shape of the recess portion  12  is substantial rectangle. When the user brings his/her finger into touch or close to the touch surface  10   f , the detection device  40  detects a position where electrostatic capacitance varies. The comparator  53  compares a position where the touch detection device  40  has detected the variance of electrostatic capacitance and a position of each of recess portions  11 ,  12  and  13  stored in the position/shape memory  51 . For example, when the user brings his/her finger into touch or close to the recess portion  12 , as a result of the comparison, the comparator  53  makes a determination that the touch detection device  40  has detected the variance of electrostatic capacitance proximity to the recess portion  12 . Then, followed by moving the finger along the edge of the recess portion  12 , the locus memory  52  calculates locus of a position where the touch detection device  40  has detected the variance of electrostatic capacitance on the basis of information received from the touch detection device  40 , and stores the circle like locus in itself. Furthermore, the locus memory  52  calculates a moving rate and a moving direction of a position where the touch detection device  40  has detected the variance of electrostatic capacitance on the basis of information received from the touch detection device  40  and time when the information has been received therefrom, and stores the results in itself. If the comparator  53  makes a determination that the detection device  40  has detected a variance of electrostatic capacitance proximate to recess portion  12 , the comparator  53  compares the circular locus stored in the locus memory  52  and the 2-dimensional shape of the recess portion  12  stored in the position/shape memory  51 . As a result of the comparison, because the finger moves along the edge of recess portion  12 , the comparator  53  makes a determination that the circular locus tracks the 2-dimensional shape of recess portion  12 . Then, the comparator  53  changes a signal output from the output device  54  in accordance with a moving rate and a moving direction of a position where the touch detection device  40  has detected the variance of electrostatic capacitance. In this way, the controller  50  changes a signal output from the output device  54  in accordance with locus of a position where the touch detection device  40  has detected the variance of electrostatic capacitance. The device controller  60  controls the liquid crystal panel  30  to scroll the display image in accordance with a change of the signal output from the output device  54 . 
     The subject to be changed by the device controller  60  is not limited to the scroll of the displayed image. 
     As described above, the 2-dimensional shape of the recess portion  13  is circle. When the user brings his/her finger into touch or close to the touch surface  10   f , the detection device  40  detects a position where electrostatic capacitance varies. The comparator  53  compares a position where the touch detection device  40  has detected the variance of electrostatic capacitance and a position of each the recess portions  11 ,  12  and  13  stored in the position/shape memory  51 . For example, when the user brings his/her finger into touch or close to the recess portion  13 , as a result of the comparison, the comparator  53  makes a determination that the touch detection device  40  has detected the variance of electrostatic capacitance proximity to the recess portion  13 . Then, followed by moving the finger along the edge of the recess portion  13 , the locus memory  52  calculates locus of a position where the touch detection device  40  has detected the variance of electrostatic capacitance on the basis of information received from the touch detection device  40 , and stores the circle like locus in itself. Furthermore, the locus memory  52  calculates a moving rate and a moving direction of a position where the touch detection device  40  has detected the variance of electrostatic capacitance on the basis of information received from the touch detection device  40  and time when the information has been received therefrom, and stores the results in itself. If comparator  53  makes a determination that the detection device  40  has detected a variance of electrostatic capacitance proximate to the recess portion  13 , the comparator  53  compares the circular locus stored in the locus memory  52  and the 2-dimensional shape of the recess portion  13  stored in the position/shape memory  51 . As a result of the comparison, because the finger moves along the edge of the recess portion  13 , the comparator  53  makes a determination that the circular locus tracks the 2-dimensional shape of the recess portion  13 . Then, the comparator  53  changes a signal output from the output device  54  in accordance with a moving rate and a moving direction of a position where the touch detection device  40  has detected the variance of electrostatic capacitance. In this way, the controller  50  changes the signal output from the output device  54  in accordance with the locus of a position where the touch detection device  40  has detected the variance of electrostatic capacitance. The device controller  60  controls the audio component set to adjust a volume in accordance with a change of the signal output from the output device  54 . The subject to be changed by the device controller  60  when the user moves his/her finger along the edge of the recess portion  13  is not limited to the volume of the audio component set. The subject to be changed by the device controller  60  when the user moves his/her finger along the edge of the recess portion  13  may be the same as the subject to be changed by the device controller  60  when the user moves his/her finger along the edge of the recess portion  11 . 
     In this way, when the user moves his/her finger along the recess portion, the display device with touch detection function  1  can assign functions for input to each the recess portions  11 ,  12 ,  13 . Furthermore, when the user moves his/her finger along the edge of either recess portions  11 ,  12  or  13 , the subject to be changed by the device controller  60  is a subject which is easy for the user to associate with the 2-dimensional shape of the recess portion. 
     Thus, the display device with touch detection function  1  enables the user to input information by bringing his/her finger into touch to the recess portions  11 ,  12 ,  13  on the display plane. Furthermore, the display device with touch detection function  1  enables the user to recognize a position of the recess portions  11 ,  12 ,  13  through his/her touch sense even if the user cannot view the recess portions  11 ,  12 ,  13 . Therefore, the display device with touch detection function  1  allows the user to facilitate information input operation on the display plane even if the user cannot view the display plane. 
     Furthermore, because the controller  50  allows the output device  54  to output a signal which is changed in accordance with the locus of a position where the touch detection device  40  has detected a variance of electrostatic capacitance, the display device with touch detection function  1  enables the user to input information in accordance with movement of user&#39;s finger. Accordingly, when the user moves his/her finger along the edge of either the recess portions  11 ,  12  or  13 , the subject to be changed by the device controller  60  is a subject which is easy for the user to associate with the 2-dimensional shape of the recess portion. Therefore, the display device with touch detection function  1  allows the user to facilitate information input operation on the display plane even if the user cannot view the display plane. 
     Moreover, the display device with touch detection function  1  includes a buffer layer  20  that is made of optical elastic resin, which is interposed between the liquid crystal panel  30  and the cover member  10 . This results in decrease of reflection at an interface between the cover member  10  and the optical elastic resin and at an interface between the optical elastic resin and the liquid crystal panel  30 . As the decrease of reflection at the interface, the recess portions  11 ,  12  and  13  are less vivid. Thus, the display device with touch detection function  1  decreases possibility that the recess portions  11 ,  12 ,  13  interfere visibility of the display image. 
     Preferably, the touch surface  10   f  of the cover member  10  is unti-glare treated. Advantageously, it leads to decrease of possibility that glare on the touch surface  10  occurs due to scattering of light incident on the touch surface  10   f . As the decrease of possibility that glare occurs, the recess portions  11 ,  12  and  13  are less vivid. Thus, the display device with touch detection function  1  decreases possibility that the recess portions  11 ,  12 ,  13  interfere visibility of the display image. 
     Preferably, the touch surface  10   f  of the cover member  10  is unti-reflection treated. Advantageously, it leads to decrease of reflectivity of light on the touch surface  10   f . As the decrease of reflectivity of light on the touch surface  10   f , the recess portions  11 ,  12  and  13  are less vivid. Thus, the display device with touch detection function  1  decreases possibility that recess portions  11 ,  12 ,  13  interfere visibility of the display image. 
     Preferably, the touch surface  10   f  of the cover member  10  is treated with a water-shedding coating or an oil-shedding coating. Advantageously, it leads to less vivid of a finger print or other dust adhered on the touch surface  10   f  as well as to easy wipe off the touch surface  10   f . As less vivid of the finger print adhered near the recess portions  11 ,  12  and  13  and easy wipe off, the recess portions  11 ,  12  and  13  are less vivid. Thus, the display device with touch detection function  1  decreases possibility that recess portions  11 ,  12  and  13  interfere with a visibility of the display image. 
     Preferably, the touch surface  10   f  of the cover member  10  is treated with a hydrophilic coating or a lipophilic coating. Advantageously, it leads to less vivid of the finger print or other dust adhered on the touch surface  10   f  because the finger print thinly spreads over the touch surface  10   f . As less vivid of finger print adhered near the recess portions  11 ,  12  and  13 , the recess portions  11 ,  12  and  13  are less vivid. Thus, the display device with touch detection function  1  decreases possibility that the recess portions  11 ,  12  and  13  interfere visibility of the display image. 
     1-2. Embodiment 2 
       FIG. 7  is an exploded view illustrating a display device with touch detection function according to the embodiment 2. As illustrated in  FIG. 7 , a display device with touch detection function  1 A includes a liquid crystal panel  30  as a display panel, a buffer layer  20 , and a cover member  10 A. Elements substantially identical in function and configuration as those of the embodiment 1 are denoted by like reference numerals, and points where the modification differs from the embodiment 1 are mainly described below. 
     The cover member  10 A is a component stacked on a display plane side of the liquid crystal panel  30  and protecting the display plane of the liquid crystal panel  30 . For example, the cover member  10 A may be made of glass and has a rectangle shape when viewed from a vertical direction relative to the display plane. The cover member  10 A has projection portions  11 A,  12 A and  13 A on the side of the touch surface  10 Af which is opposite to a plane that faces the liquid crystal panel  30 . The back plane which faces the liquid crystal panel  30  of the cover member  10 A, is flat and contacts with the buffer layer  20 . The cover member  10 A can protect a surface of the liquid crystal panel  30 . The material of the cover member  10 A may include various materials with transparent characteristics, such as a transparent resin. Alternatively, the cover member  10 A may have a squire or circular shape when viewed from a vertical direction relative to the display plane. 
     As illustrated in  FIG. 7 , each of the projection portions  11 A,  13 A of the embodiment 2 has 2-dimensional circle shape, and the projection portion  12 A has substantial rectangular shape. The projection portion  12 A is located between the projection portions  11 A and  13 A. The direction of a longitudinal side of the projection portion  12 A is parallel to a direction of a linear line passing centers of the projection portions  11 A,  13 A. The projection portions  11 A,  12 A and  13 A may be located along the longitudinal side of the cover member  10 A as well as closer to the longitudinal side of the touch surface  10 Af than a center thereof. 
     Arrangement of the projection portions  11 A,  12 A and  13 A are not limited thereto. For example, the projection portions  11 A,  12 A and  13 A may be located along a traverse side of the cover member  10 A. Alternatively, the projection portions  11 A,  12 A and  13 A may be located in line at the center of the touch surface  10 Af. It is, however, preferable that the projection portions  11 A,  12 A,  13 A are located close to the longitudinal or traverse side away from the center of the touch surface  10 Af because the projection portions  11 A,  12 A and  13 A are less vivid. The cover member  10 A may not include all of the projection portions  11 A,  12 A and  13 A. For example, the cover member  10 A may include one of the projection portions  11 A,  12 A and  13 A, or combination of two of the projection portions  11 A,  12 A and  13 A. 
       FIG. 8  illustrates a A-A′ cross-sectional view of  FIG. 7 . As illustrated in  FIG. 8 , the projection portion  12 A may be a bump with a dimension L2 in height. Thereby, the user can easily recognize the position of the projection portion  12 A by touching the edge of the projection portion  12 A. For example, the projection portion  12 A is formed by ablating the touch surface  10 Af except for the projection portion  12 A. For example, the dimension L2 according to the embodiment 2 may be 0.1 mm. It is preferable that the dimension L2 is from 0.02 mm to 0.5 mm. In the case where the dimension L2 is greater than 0.02 mm, cover member  10 A improves the possibility that the human being can recognize the projection portion with his/her sense of a finger. In the case where the dimension L2 is not more than 0.5 mm, the cover member  10 A decreases the possibility that the projection portion interferes with a visibility of the image displayed on the liquid crystal panel  30 . Although the projection portion  12 A has been described above, the same description may be also applied to other projection portions  11 A and  13 A. Thus, the display device with touch detection function  1 A allows the user to easily recognize each position of the projection portions  11 A,  12 A and  13 A by touching the projection portions  11 A,  12 A and  13 A without viewing the display plane of the liquid crystal panel  30 . 
     Although the projection portions  11 A,  12 A and  13 A according to the embodiment 2 are formed by ablating the touch surface  10 Af except for the projection portions  11 A,  12 A and  13 A, the projection portions  11 A,  12 A and  13 A may be formed with a transparent film.  FIG. 9  illustrates A-A′ cross-sectional view of  FIG. 7  where the projection portions are formed with the transparent film. In this example, the transparent film F2 may have a substantially rectangular shape, and be stacked on a part of the touch surface  10 Af. Side wall of the recess portion  12 A configures a cross-section of the transparent film F2. For example, the transparent film F2 may be made of polyethylene terephthalate and the like, and function as an anti-scattering film with dimension L2 in thickness. The transparent film F2 allows the user to easily recognize the position of the projection portion  12 A by touching the edge of the projection portion  12 A. In addition to the transparent film F2, two of circular transparent films are stacked on a part of the touch surface  10 Af. The side wall of the projection portion  11 A configures cross section of one of the two of circular transparent films. The side wall of the projection portion  13 A configures cross section of the other of the two of circular transparent films. Thus, the display device with touch detection function  1 A allows the user to recognize each position of the projection portions  11 A,  12 A and  13 A by touching the projection portions  11 A,  12 A and  13 A without viewing the display plane of the liquid crystal panel  30 . Transparent film F1 can provide the display device with touch detection function  1 A with projection portions  11 A,  12 A and  13 A much easier than ablating the touch surface  10 Af. The side wall of the projection portions  11 A,  12 A and  13 A may include at least part of cross section of the transparent film F2. For example, one part of the side wall of the projection portions  11 A,  12 A and  13 A may be configured by cross section of the transparent film F2, and the other part of the side wall of the projection portions  11 A,  12 A and  13 A may be configured by a housing and the like which encloses the display device with touch detection function  1 A. 
     The display device with touch detection function  1 A includes a controller  50  that is connected to the touch detection device  40  illustrated in  FIG. 6 . As described above, the 2-dimension shape of the projection portion  11 A is circle. When the user moves his/her finger along the edge of the projection portion  11 A, the device controller  60  controls the liquid crystal panel  30  to adjust luminance of the display device in accordance with a change of the signal output from the output device  54 . The subject to be changed by the device controller  60 , when the user moves his/her finger along the edge of the projection portion  11 A, is not limited to the luminance of the display. 
     As described above, 2-dimensional shape of the projection portion  12 A is substantially rectangular. When the user moves his/her finger along the longitudinal side of the projection portion  12 A, the device controller  60  controls the liquid crystal panel  30  to scroll the displayed image in accordance with a change of the signal output from the output device  54 . The subject to be changed by the device controller  60 , when the user moves his/her finger along the longitudinal side of the projection portion  12 A, is not limited to the scroll of the displayed image. 
     As described above, the 2-dimensional shape of the projection portion  13 A is circle. When the user moves his/her finger along the edge of the projection portion  13 A, the device controller  60  controls an audio component set to adjust a volume in accordance with a change of the signal output from the output device  54 . The subject to be changed by the device controller  60 , when the user moves his/her finger along the edge of the projection portion  13 A, is not limited to the volume of the audio component set. The subject to be changed by the device controller  60  when the user moves his/her finger along the edge of the projection portion  13 A may be the same as the subject to be changed by the device controller  60  when the user moves his/her finger along the edge of the projection portion  11 A. 
     In this way, when the user moves his/her finger along either the projection portions  11 A,  12 A or  13 A, the display device with touch detection function  1 A can assign functions for input to each the projection portions  11 A,  12 A and  13 A. Furthermore, when the user moves his/her finger along the edge of either the projection portions  11 A,  12 A or  13 A, the subject to be changed by the device controller  60  is a subject which is easy for the user to associate with the 2-dimensional shape of the projection portion. 
     Preferably, the touch surface  10 Af of the cover member  10 A is unti-glare treated. Advantageously, it leads to decrease of possibility that glare on the touch surface  10 Af occurs due to scattering of light incident on the touch surface  10 Af. As the decrease of possibility that the glare occurs, the projection portions  11 A,  12 A and  13 A are less vivid. Thus, the cover member  10 A decreases possibility that projection portions  11 A,  12 A and  13 A interfere with a visibility of images displayed on the liquid crystal panel  30 . 
     Preferably, the touch surface  10 Af of the cover member  10 A is unti-reflection treated. Advantageously, it leads to decrease of reflectivity of light on the touch surface  10 Af. As decrease of reflectivity of light on the touch surface  10 Af, the projection portions  11 A,  12 A and  13 A are less vivid. Thus, the cover member  10 A decreases possibility that projection portions  11 A,  12 A,  13 A interfere with a visibility of the displayed image on the liquid crystal panel  30 . 
     Preferably, the touch surface  10 Af of the cover member  10 A is treated with a water-shedding coating or an oil-shedding coating. Advantageously, it leads to less vivid of finger print or other dust adhered on the touch surface  10 Af as well as to easy wipe off the touch surface  10 Af. As less vivid of a finger print adhered near the projection portions  11 A,  12 A and  13 A and easy wipe off, the projection portions  11 A,  12 A and  13 A are less vivid. Thus, the cover member  10 A decreases possibility that the projection portions  11 A,  12 A and  13 A interfere with a visibility of images displayed on the liquid crystal panel  30 . 
     Preferably, the touch surface  10 Af of the cover member  10 A is treated with a hydrophilic coating or a lipophilic coating. Advantageously, it leads to less vivid of a finger print or other dust adhered on the touch surface  10 Af because the finger print thinly spreads over the touch surface  10 Af. As less vivid of the finger print adhered near the projection portions  11 A,  12 A and  13 A, the projection portions  11 A,  12 A and  13 A are less vivid. Thus, the cover member  10 A decreases possibility that projection portions  11 A,  12 A and  13 A interfere with a visibility of images displayed on the liquid crystal panel  30 . 
     [Modification 1] 
     Although a modification of the embodiment 1 is described below, the modification is applicable to the embodiment 2 by replacing the recess portion with projection portion.  FIG. 10  illustrates a schematic perspective view of a cover member according to the modification 1. The cover member  10 B according to the modification 1 has recess portions  14 ,  15  on the side of the touch surface  10 Bf which is opposed to a plane that faces the liquid crystal panel  30 . As illustrated in  FIG. 10 , the recess portions  14 ,  15  have the same 2-dimensional shape and are oriented in a manner of a mirror image. Recess portions  14 ,  15  are located along and closer the traverse side of the touch surface  10 Bf than the center thereof. 
     In the modification 1, the device controller  60  controls the audio component set that is external device in accordance with a change of the signal output from the output device  54 . For example, when the user brings his/her finger into touch to the recess portion  14 , the device controller  60  controls the audio component set to turn up a volume. When the user brings his/her finger into touch to the recess portion  15 , the device controller  60  controls the audio component set to turn down the volume. The subject to be changed by the device controller  60 , when the user brings his/her finger into touch to the recess portions  14 ,  15 , is not limited to the volume of the audio component set. 
     Arrangement of the recess portions  14  and  15  are not limited thereto. For example, the recess portions  14 ,  15  may be located along a longitudinal side of the cover member  10 B. Alternatively, the recess portions  14 ,  15  may be located at the center of the touch surface  10 Bf. It is, however, preferable that the recess portions are located close to the longitudinal or traverse side away from the center of the touch surface  10 Bf because the recess portions  14 ,  15  are less vivid. In addition to the recess portions  14 ,  15 , the cover member  10 B may include one of the recess portions  11 ,  12  and  13 , or combination of a plurality of the recess portions  11 ,  12  and  13 . 
     [Modification 2] 
       FIG. 11  illustrates a schematic perspective view of a cover member according to a modification 2. The cover member  10 C according to the modification 2 has a recess portion  16  on the side of the touch surface  10 Cf which is opposed to a plane that faces the liquid crystal panel  30 . As illustrated in  FIG. 11 , the recess portion  16  has 2-dimensional cross shape and is positioned in a corner of the touch surface  10 Cf. The recess portion  16  includes center portion  160  which is positioned at a center of the cross shape, an extended portion  161  which extends from the center portion  160  to one direction, an extended portion  162  which extends from the center portion  160  to a direction perpendicular to the extended portion  161 , an extended portion  163  which extends from the center portion  160  to a direction opposite to the extend portion  161 , and an extended portion  164  which extends from the center portion  160  to a direction opposite to the extend portion  162 . 
     Arrangement of the recess portion  16  is not limited thereto. For example, the recess portion  16  may be located along a longitudinal side or a traverse side of the cover member  10 C and at nearly middle point of the longitudinal side or the traverse side thereof. It is, however, preferable that the recess portion  16  is located close to the longitudinal or traverse side away from the center of the touch surface  10 Cf because the recess portion  16  is less vivid. In addition to the recess portion  16 , the cover member  10 C may include one of the recess portions  11 ,  12 ,  13 ,  14  and  15  or combination of a plurality of the recess portions  11 ,  12 ,  13 ,  14  and  15 . 
     In the modification 2, the device controller  60  controls the liquid crystal panel  30  in accordance with a signal from the output device  54 . For example, when the user brings his/her finger into touch to the extended portion  161  of the recess portion  16 , the device controller  60  controls the liquid crystal panel  30  to scroll the displayed image in the same direction as a direction in which the extended portion  161  extends from the center portion  160 . When the user brings his/her finger into touch to the extended portion  162  of the recess portion  16 , the device controller  60  controls the liquid crystal panel  30  to scroll the displayed image in the same direction as a direction in which the extended portion  162  extends from the center portion  160 . When the user brings his/her finger into touch to the extended portion  163  of the recess portion  16 , the device controller  60  controls the liquid crystal panel  30  to scroll the displayed image in the same direction as a direction in which the extended portion  163  extends from the center portion  160 . When the user brings his/her finger into touch to the extended portion  164  of the recess portion  16 , the device controller  60  controls the liquid crystal panel  30  to scroll the displayed image in the same direction as a direction in which the extended portion  164  extends from the center portion  160 . 
     In the modification 2, the device controller  60  may control the audio component set which is an external device in accordance with a change of the signal output from the output device  54 . For example, when the user brings his/her finger into touch to the extended portion  161  of the recess portion  16 , the device controller  60  controls the audio component set to turn up a volume. When the user brings his/her finger into touch to the extended portion  163  of the recess portion  16 , the device controller  60  controls the audio component set to turn down the volume. When the user brings his/her finger into touch to the extended portion  162  of the recess portion  16 , the device controller  60  controls the audio component set to skip a tune forwardly. When the user brings his/her finger into touch to the extended portion  164  of the recess portion  16 , the device controller  60  controls the audio component set to skip a tune backwardly. The subject to be changed by the device controller  60  when the user brings his/her finger touch into the recess portion  16  is not limited thereto. 
     In the modification 2, when a moving direction of a position where the touch detection device  40  has detected the change of electrostatic capacitance tracks the edge of the recess portion  16 , the comparator  53  may change a signal output from the output device  54 . For example, when the user moves his/her finger in a direction from either the extended portions  161 ,  162 ,  163  or  164  to another extended portion opposite to the extended portion, the device controller  60  controls the liquid crystal panel  30  to scroll the displayed image in the same direction. 
     [Modification 3] 
       FIG. 12  illustrates a schematic perspective view of a cover member according to a modification 3. The cover member  10 D according to the modification 3 has the recess portions  11 ,  12  and  13  on the side of the touch surface  10 Df which is opposed to a plane that faces the liquid crystal panel  30 . Furthermore, the touch surface  10 Df is convex curve. In this way, because the touch surface  10 Df is convex curve, the touch surface  10 Df allows the user to easily recognize which position he/she is touching in entire the touch surface  10 Df. Therefore, the user can easily recognize a position of the recess portions  11 ,  12 ,  13  on the display plane. Accordingly, the display device with touch detection function  1  enable the user to facilitate information input operation on the display plane even if the user cannot view the display plane. Alternatively, the touch surface  10 Df may be concave curve. 
     2. APPLICATION EXAMPLE 
     Electronic Apparatus 
       FIG. 13  illustrates an example of an electronic apparatus to which the display device with touch detection function according to the embodiments and modifications are applied. Aforementioned display device with touch detection function  1  according to the embodiments and modifications is applicable to the electronic apparatus in any field of art, for example, a vehicle navigation system, a television device, a portable terminal device such as digital camera, a laptop PC, a mobile phone, a video camera and so on. In other words, the display device with touch detection function  1  according to the embodiments and modifications is applicable to the electronic apparatus in any field of art, which displays still images or moving images produced with image signals that are input from an external device or image signals that are produced by itself internally. The electronic apparatus includes a control device that sends image signals to the liquid crystal panel  30  and controls the operation thereof. 
     In  FIG. 13 , the electronic apparatus is vehicle navigation system to which the display device with touch detection function  1  according to the embodiments and modifications is applied. The display device with touch detection function  1  is installed in a dashboard  300  in a car room. Specifically, the display device with touch detection function  1  is installed in the dashboard  300  at the position between a driver&#39;s seat  311  and an assistant driver&#39;s seat  312 . The display device with touch detection function  1  of the vehicle navigation system is used as, for example, a display of navigation, a display of an operation panel of audio, a display of a movie, a display of a man to whom the user is talking over a phone, and so on. Preferably, aforementioned recess portions or projection portions on the touch surface  10   f  are located a side near to a driver&#39;s seat  311 . This allows the user to facilitate information input operation because the user can easily reach the recess portions or projection portions of the display device with touch detection function  1 . 
     While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel embodiments described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the embodiments described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions. 
     3. ASPECTS OF PRESENT DISCLOSURE 
     The present disclosure includes aspects as follows. 
     (1) A display device with touch detection functions comprising: 
     a display panel including a display plane for displaying images and an electrostatic capacitance type touch detection device;
 
a cover member stacked on the display plane of the display panel, the cover member having at least one recess portion and/or projection portion on the side of a touch surface opposite to a plane that faces the display panel; and
 
a controller configured to send a signal upon the touch detection device detects a variance of electrostatic capacitance proximity to the at least one recess portion and/or projection portion.
 
     (2) The device according to (1), wherein the controller changes the signal in accordance with locus of a position where the touch detection device has detected variation of electrostatic capacitance. 
     (3) The device according to (1), wherein the touch surface is unti-glare treated. 
     (4) The device according to (1), wherein the touch surface is unti-reflection treated. 
     (5) The device according to (1), wherein the touch surface is treated with a water-shedding coating or an oil-shedding coating. 
     (6) The device according to (1), wherein the touch surface is treated with a hydrophilic coating or a lipophilic coating. 
     (7) The device according to (1) further comprising a buffer layer interposed between the display panel and the cover member, the buffer layer being made of optical elastic resin. 
     (8) The device according to (1) further comprising a transparent film overlapping a part of the touch surface, wherein side wall of the recess portion includes a cross-section of the transparent film. 
     (9) The device according to (1) further comprising a transparent film overlapping a part of the touch surface, wherein side wall of the projection portion includes a cross-section of the transparent film. 
     (10) The device according to (1), wherein the recess portion and/or projection portion has circular shape when viewed from a vertical direction relative to the touch surface. 
     (11) The device according to (1), wherein the recess portion and/or projection portion has rectangular shape when viewed from a vertical direction relative to the touch surface. 
     (12) The device according to (1), wherein the recess portion and/or projection portion has triangle shape when viewed from a vertical direction relative to the touch surface. 
     (13) The device according to (1), wherein the recess portion and/or projection portion has cross shape when viewed from a vertical direction relative to the touch surface. 
     (14) The device according to (1), wherein the touch surface is concave or convex curve. 
     (15) An electronic apparatus comprising: 
     a display panel including a display plane for displaying image and an electrostatic capacitance type touch detection device;
 
a cover member stacked on the display plane of the display panel, the cover member having at least one recess portion and/or projection portion on the side of a touch surface opposite to a plane that faces the display panel; and
 
a controller configured to send a signal upon the touch detection device detects a variance of electrostatic capacitance proximity to the at least one recess portion and/or projection portion.
 
     (16) A cover member stacked on a display panel including an electrostatic capacitance type touch detection device and a display plane for displaying image, the cover member comprising at least one recess portion and/or projection portion on the side of a touch surface opposite to a plane that faces the display panel. 
     It should be understood that various changes and modifications to the presently preferred embodiments described herein will be apparent to those skilled in the art. Such changes and modifications can be made without departing from the spirit and scope of the present subject matter and without diminishing its intended advantages. It is therefore intended that such changes and modifications be covered by the appended claims.