JP2020013598A - Picture display device - Google Patents

Abstract

To provide a picture display device of a full flat structure including capacitive touch switches that are inexpensive and easy to assemble.SOLUTION: The picture display device includes a capacitive touch switch 25 that detects a finger and performs switching on the basis of a change in capacitance that occurs when a finger approaches the panel. The touch switch 25 includes: a panel (operation panel section 251); a substrate 31 on which electrodes (electrode part 252) for detecting capacitance are mounted; and conductive members 29A and 29B corresponding the electrodes. The conductive members 29A and 29B are formed and fixed being sandwiched between the panel and the electrodes.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an image display device, and more particularly, to an image display device having a full flat structure provided with a touch switch.

  2. Description of the Related Art In recent years, as an image display device, a full flat structure image display device in which a display screen and a frame are integrated has been known. The image display device of the full flat structure has a superior sense of design because it has a sense of unity as compared with an image display device in which the display screen and the frame are separate as in the past, and the frame portion is inconspicuous from the sense of unity. This gives the viewer an impression that the image display devices are connected smoothly when the image display devices are arranged vertically and horizontally. Therefore, an image display device having a full flat structure is being demanded in the market.

  When an attempt is made to realize a touch panel with an image display device having a full flat structure, as a method of detecting touch on glass, for example, an operation is performed based on a change in capacitance that occurs when a fingertip or the like approaches a known glass. A capacitive touch panel is preferable (for example, see Patent Document 1).

JP 2013-106308 A

  In addition, with the recent trend of image display devices having a large screen, a full-flat image display device having a large screen is required. In the case of a large-screen image display device, the glass on the entire surface of the display screen may be very thick in order to secure strength. For example, in the case of an 80-inch display, a thickness of 3 mm or more is required.

  Therefore, if a mechanical operation button is to be provided in a frame portion of a large-screen image display device having a full flat structure, it is necessary to make a hole in a large-sized thick glass, so that processing is not easy and cost is reduced. There is a problem of becoming high.

  On the other hand, it is conceivable to provide a capacitance type touch switch instead of a mechanical operation button on the frame, but in this case, the area of the capacitance detection sheet for detecting a change in capacitance should be extended to the frame portion. You need to spread it.

  However, since the capacitance detection sheet is usually made according to the size of the display screen, it cannot be applied to a switch such as a power supply located in a frame portion outside the display screen. In addition, when a capacitance detection sheet that is slightly larger than the display screen is used, the frame portion extends beyond the portion where the switch such as the power supply is arranged, so that the design property is impaired, and a plurality of image display devices can be vertically and horizontally. A problem arises when configuring a multi-screen by combining them. In addition, there is a problem in that placing an order for a capacitance detection sheet that does not correspond to the size of the display screen increases the cost burden.

  A touch panel and a touch switch may be configured by joining a plurality of small-area capacitance detection sheets. In this case, not only the small-area capacitance detection sheet but also the capacitance detection sheet is used. Since extra members such as cable wiring connecting the sheets are increased, there is a problem that not only the cost burden is increased but also the assemblability is deteriorated.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an image of a full flat structure provided with a capacitive touch switch which is inexpensive and easy to assemble. A display device is provided.

  The present invention relates to an image display device including a capacitance-type touch switch that detects a finger and performs switching based on a change in capacitance generated when a finger approaches a panel, wherein the touch switch The panel, comprising a substrate on which electrodes for detecting capacitance are mounted, and a conductive member corresponding to the electrodes, the conductive member is provided between the panel and the electrodes, An image display device is provided which is sandwiched and fixed between a panel and the electrode.

  According to the present invention, it is possible to realize an image display device having a full flat structure provided with a capacitive touch switch that is easy to assemble and inexpensive. Further, even if an electrode component is not separately provided, it is sufficient to form the electrode on the substrate on which the control circuit is mounted by using a conductive member having a thickness greater than that of the component mounted on the substrate.

1 is a block diagram illustrating a schematic configuration of an image display device according to the present invention. It is a front view of the image display device of the present invention. FIG. 3 is a left side view of a display unit and an operation unit shown in FIG. 2. FIG. 3 is an enlarged view of an X part of the operation unit shown in FIG. 2. FIG. 5 is a cross-sectional view taken along the line AA ′ of the operation unit shown in FIG. 4. 5 is a flowchart illustrating a procedure for detecting the capacitance of the touch switch of the image display device according to the present invention. It is an explanatory view showing an example of the detection value of the capacitance of the electrode of the conventional touch switch 25. FIG. 9 is an explanatory diagram showing a mechanism in which an erroneous operation occurs due to coupling of capacitance in a capacitance type touch panel using large glass. 5 is a graph illustrating an example of a detection value of a capacitance of an electrode of a touch switch according to the present invention. It is explanatory drawing which shows the reason that the coupling | bonding of the electrostatic capacitance with the electrode adjacent to the touch switch of this invention is reduced. FIG. 9 is a perspective view of a conductive member of the touch switch according to the second embodiment. FIG. 12 is an explanatory diagram illustrating an example of installation of the conductive member illustrated in FIG. 11 on a touch switch. It is an explanatory view showing the structure of the conventional touch switch 25. FIG. 9 is an explanatory diagram illustrating a structure of a touch switch according to a third embodiment. FIG. 9 is an explanatory diagram illustrating a problem when a GND pattern is provided in a touch switch. FIG. 14 is an explanatory diagram illustrating a structure of a touch switch according to a fourth embodiment.

  Hereinafter, the present invention will be described in more detail with reference to the drawings. It should be noted that the following description is an example in all points and should not be construed as limiting the present invention.

(Embodiment 1)
<Configuration of Image Display Device 100>
Hereinafter, the configuration of the image display device 100 including the touch switch 25 according to the first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a block diagram showing a schematic configuration of an image display device 100 according to the present invention. FIG. 2 is a front view of the image display device 100 of the present invention. FIG. 3 is a left side view of the display unit 101 and the operation unit 102 shown in FIG. FIG. 4 is an enlarged view of an X part of the operation unit 102 shown in FIG.

The image display device 100 is a device that displays an image or a video such as a moving image, a still image, or a 3D image. A touch switch for performing a power on / off operation, a menu screen display operation, and the like.
Examples of the image display device 100 include a television, a personal computer (PC), a public display, a monitor, and a display such as an electronic blackboard.
The image display device 100 is not limited to a stationary image display device, but may be a portable image display device such as a smartphone or a tablet terminal.

  As shown in FIG. 1, an image display device 100 of the present invention mainly includes a microcomputer 10, a signal detection unit 11, a scaler 12, an image memory 13, an image display unit 14, a nonvolatile memory 15, a volatile memory 16, It includes a light 17, a power supply unit 18, a DC-DC converter 19, a timer 20, a light receiving unit 21, a communication unit 22, an input terminal unit 23, an indicator light 24, and a touch switch 25.

Hereinafter, each component shown in FIG. 1 will be described.
The microcomputer 10 is a circuit mainly composed of a microprocessor (Microprocessor), and is an arithmetic device that performs control processing of various devices and processing of an operating system, application software, and the like. Further, the peripheral circuit may include an ASIC (Application Specific Integrated Circuit) which is an integrated circuit designed and manufactured for a specific application, and other circuits having an arithmetic function.

The signal detection unit 11 is a unit that detects an input signal input from an external device (not shown) through the input terminals 231 to 234.
The types of input signals include, for example, analog input terminals such as VGA terminals and component terminals, digital input elements such as DVI terminals, HDMI (registered trademark) terminals and DisplayPort terminals, and control system input terminals such as USB connectors. Input signal.
Further, the present invention is not limited to the detection of a wired input signal, but may be a device for detecting a wireless input signal such as Bluetooth (registered trademark) or a wireless LAN.

  The scaler 12 is a part that processes image data. For example, processing such as image correction, color correction, γ correction, double-speed processing, OSD generation, and OSD superposition are performed.

  The image memory 13 is a part that stores the image data processed by the scaler 12. For example, it is used for FRC (Frame Rate Conversion) and the like.

  The image display unit 14 is a part that displays various information such as an input image and a setting screen 140.

The image display unit 14 has a display surface covered with a touch panel, and can perform a touch panel operation by detecting a position of a user's fingertip or the like in contact with the display surface. As a position detection method of the touch panel, a capacitance method for detecting a change in capacitance generated when a finger approaches a panel is used.
In addition, as the display panel of the image display unit 14, a glass 26 common to the touch switch 25 is used (see FIG. 3).

  The non-volatile memory 15 is a part for storing information necessary for realizing various functions of the image display device 100, such as a control program, log information, user setting information, and fixed text for system information. As the nonvolatile memory 15, for example, a storage medium such as a flash memory or an EEPROM is used.

  The volatile memory 16 is a part for temporarily storing various data and transaction results. The volatile memory 16 is also used as a work area of the program. As the volatile memory 16, for example, a semiconductor element such as an SRAM or a storage medium such as a hard disk is used.

  The backlight 17 illuminates the liquid crystal from the back of the image display unit 14. As a light source of the backlight 17, for example, an LED or a cold cathode fluorescent lamp (CCFL) is used. In addition, a direct type system, an edge light system, and other systems are used.

  The power supply unit 18 is a part that converts external AC power into DC and supplies power to each part of the image display device 100. As the power supply unit 18, for example, an AT power supply, an ATX power supply, or an SFX power supply is used.

  The DC-DC converter 19 is a part that steps down or boosts the DC current input from the power supply unit 18 and supplies necessary power to each part of the image display device 100.

  The timer 20 is a part that measures the elapsed time of various processes of the image display device 100.

  The light receiving unit 21 is a part that receives an infrared (IR) signal from the remote controller, and receives a command from the user through receiving the infrared signal from the remote controller.

The communication unit 22 is a part that performs wired or wireless communication with an external device via a network to transmit and receive data. As the network, a LAN, a wide area network (WAN) such as the Internet, a dedicated communication line, or the like is used.
Examples of the wireless communication standard include Bluetooth (registered trademark) and wireless LAN standards such as IEEE 802.11a, IEEE 802.11b, IEEE 802.11g, and IEEE 802.11n.
Examples of the external device at the communication destination include devices capable of wired or wireless communication, such as a PC, a mobile terminal, and a server, and include a legacy interface, such as RS-232C.

The input terminal unit 23 is a part for connecting a terminal of an external device and inputting a signal.
Although the input terminal unit 23 shown in FIG. 1 has four input terminals 231 to 234 connectable to terminals of an external device, this is an example, and may have an arbitrary number of input terminals.
Examples of the terminal connectable to the input terminal unit 23 include an analog input terminal such as a VGA terminal and a component terminal, a digital input element such as a DVI terminal, an HDMI terminal, and a DisplayPort terminal, and a control system input terminal such as a USB connector. can give.
Examples of the external device include a device capable of outputting a moving image or a still image signal, such as a PC, a portable terminal, a recorder, and a video camera.

  The display lamp 24 is a lamp that displays the power state of the image display device 100 using an LED or the like. For example, when the power of the image display apparatus 100 is turned off, a red LED is displayed, and when the power is on, a green LED is displayed.

The touch switch 25 is a part that uses a capacitance type touch switch and receives a power on / off operation, a menu screen display operation, and the like.
The touch switch 25 receives an operation when the electrode 30 detects that the capacitance generated when touching with a fingertip or the like is equal to or larger than a predetermined threshold.

  As shown in FIG. 2, the image display device 100 is roughly divided into three parts, a display unit 101, an operation unit 102, and a support unit 103, and the operation unit 102 is provided with a touch switch 25.

  Hereinafter, the side viewed from the front of the image display device 100 is referred to as front (or front), and the back side is referred to as rear (or rear).

  As shown in FIG. 3, the display unit 101 and the operation unit 102 share the glass 26 as a common panel.

In the display unit 101, a capacitance detection sheet 141, an image display unit 14, and a substrate 32 are sequentially provided on the back surface of the glass 26.
In the operation unit 102, a conductive member 29, an electrode 30, and a substrate 31 are sequentially provided on the back surface of the glass 26.
Note that the number of the substrates 31 is not limited to one, and a plurality of substrates may be mounted.

  As described above, while the glass 26 is shared, the substrate 32 of the display unit 101 and the substrate 31 of the operation unit 102 are separately provided, so that maintenance such as replacement of the touch switch 25 becomes easy.

  As shown in FIG. 4, the operation unit 102 includes a light receiving unit 21, an indicator 24, and a touch switch 25. The user performs an operation such as a power on / off operation or a menu screen display operation by touching a predetermined portion of the glass surface of the touch switch 25 with a fingertip or the like.

  The “substrate” of the present invention is realized by the substrate 31. Further, the “panel” of the present invention is realized by the glass 26.

<Configuration and Operation of Touch Switch 25>
Next, the configuration and operation of the touch switch 25 of the present invention will be described with reference to FIGS.
FIG. 5 is a cross-sectional view of the operation unit 102 shown in FIG. FIG. 6 is a flowchart showing a procedure for detecting the capacitance of the touch switch 25 of the image display device 100 according to the present invention. FIG. 7 is an explanatory diagram showing an example of a detected value of the capacitance of the electrode 30 of the conventional touch switch 25. FIG. 9 is a graph showing an example of the detected value of the capacitance of the electrode 30 of the touch switch 25 according to the present invention. FIG. 10 is an explanatory diagram showing the reason why the coupling of the capacitance with the electrode 30 adjacent to the touch switch 25 of the present invention is reduced.

  As shown in FIG. 5, the touch switch 25 of the present invention includes an operation panel unit 251, an electrode unit 252, and a substrate 31.

The operation panel section 251 is provided in the order of an AG (Anti-Glare, antireflection) film 27, glass 26, and ink 28 from the front side. The ink 28 uses black ink or the like, and is applied to the back surface of the glass 26.
Here, the AG film 27 is 0.1 mm thick, the glass 26 is 3.2 mm thick, and the ink 28 is 20 μm thick.

  The substrate 31 includes electrodes 30A and 30B, and conductive members 29A and 29B are provided on the electrodes 30A and 30B, respectively. The thickness of the conductive members 29A and 29B in the front-rear direction after being incorporated in the touch switch 25 is about 3 mm.

  In FIG. 6, after the startup process of the microcomputer 10 is performed, when the electrode 30 detects a change in the capacitance in step S1 (step S1), the microcomputer 10 determines in step S2 the detected value of the capacitance. Is larger than a predetermined threshold value (step S2).

  When the detected value of the capacitance is larger than the predetermined threshold value (when the determination in step S2 is Yes), the microcomputer 10 performs a process according to the detection result (step S3). Thereafter, the microcomputer 10 repeats the process of step S1 (step S1).

  On the other hand, when the detected value of the capacitance is equal to or smaller than the predetermined threshold value (when the determination in step S2 is No), the microcomputer 10 repeats the processing in step S1 (step S1).

FIGS. 7A and 7B are examples of graphs showing the change over time of the detected value of the capacitance detected by two adjacent electrodes 30A and 30B in the conventional touch switch 25. FIG.
Here, the horizontal axis in FIGS. 7A and 7B indicates time, and the vertical axis indicates the magnitude (arbitrary unit) of the detected value of the capacitance detected by the electrode 30.

  As shown in FIGS. 7A and 7B, in the conventional touch switch 25, when a user's finger touches the touch switch 25, the corresponding electrode 30A not only detects a change in capacitance, A change in the capacitance of the adjacent electrode 30B may be detected due to the coupling of the capacitance with the fingertip. Such a tendency is remarkable especially in the case of a large-sized glass having a large thickness, and often causes an erroneous operation.

  When the electrostatic switch is mounted using the thick glass 26, as shown in FIG. 8A, when the user presses the glass surface of the touch switch 25 with a finger, an electrode corresponding to the glass surface is pressed. In addition to 30A, capacitance coupling may occur between the electrode 30B and the adjacent electrode 30B.

In addition, as shown in FIG. 8B, in the glass 26 having a large thickness, the capacitance may be coupled between the adjacent electrodes 30A and 30B, and the sensitivity of the sensor may be deteriorated.
Therefore, when the glass 26 having a large thickness is used for the touch switch 25, an erroneous operation that the user does not intend often occurs.

  Therefore, conventionally, in order to prevent erroneous operation due to the coupling of the capacitance with the adjacent electrode 30B and correctly determine that the electrode 30A has been selected by the user, it is often necessary to change the capacitance. There is a problem that complicated analysis is required and power is unnecessarily consumed.

On the other hand, FIG. 9 shows a result of measuring a change in capacitance using the touch switch 25 of the present invention.
FIGS. 9A and 9B are examples of graphs showing the change over time of the capacitance detection values respectively detected by two adjacent electrodes 30 in the touch switch 25 of the present invention.
Here, the horizontal axis in FIGS. 9A and 9B indicates time, and the vertical axis indicates the magnitude (arbitrary unit) of the detected value of the capacitance.

  In FIG. 9, the user touches only one of the glass surfaces of the touch switch 25 corresponding to the electrode 30A or the electrode 30B in the period 1, and the touch switch 25 corresponding to the electrode 30A and the electrode 30B in the period 2. The fingers touch both sides of the glass.

As shown in FIGS. 9A and 9B, in period 1, when the user's finger touches the glass surface of the touch switch 25 corresponding to the electrode 30A and the electrode 30A detects a change in the capacitance, the finger touches the glass. No electrode 30B detected a change in capacitance.
On the other hand, when the user's finger touched the glass surface of the touch switch 25 corresponding to the electrode 30B and the electrode 30B detected a change in capacitance, the adjacent electrode 30A did not detect a change in capacitance.

  Further, in the period 2, when the user's finger touched the glass surface of the touch switch 25 corresponding to the electrodes 30A and 30B, both the electrodes 30A and 30B detected a change in capacitance.

  The reason for this improvement is that, as shown in FIG. 10, a linear path connecting the finger touching the glass surface of the touch switch 25 corresponding to the electrode 30A and the adjacent electrode 30B. Since RT1 is obstructed by the air gap between the two electrodes 30A and 30B, the finger and the electrode 30B must be coupled through a longer path RT2, resulting in reduced capacitive coupling strength. It is thought that it is because.

  Also, unlike the case where the conductive members 29A and 29B are directly coupled to the planar electrodes 30A and 30B, the conductive members 29A and 29B have a three-dimensional structure having a thickness in the front-rear direction. Here, considering that the relative permittivity of air is about 1.00058 and the relative permittivity of glass is about 3.5 to 9.9, the contribution of the capacitance from the side surface of the conductive member 29B is also considered. This cannot be completely neglected, and the possibility that the contribution of the coupling of the capacitance directly connecting the finger and the upper surface of the conductive member 29B can be considered as one factor.

(Embodiment 2)
Next, the touch switch 25 of the image display device 100 according to the second embodiment of the present invention will be described with reference to FIGS.
FIG. 11 is a perspective view of the conductive member 29 of the touch switch 25 according to the second embodiment. FIG. 12 is an explanatory diagram illustrating an example of installation of the conductive member 29 illustrated in FIG. 11 on the touch switch 25.

  As shown in FIG. 11, the conductive member 29 includes an internal elastic member 291 and a conductive sheet 292 provided on a peripheral surface of the elastic member 291.

As shown in FIG. 12A, after the conductive member 29 is placed on the electrode 30 and the operation panel 251 is pushed toward the substrate 31, the conductive member 29 is brought into contact with the substrate 31 and the operation panel 251. Deformed under pressure from.
At this time, as shown in FIG. 12B, the conductive member 29 contracts in the direction of the arrow DA and also extends in the directions of the arrows RA and LA.

However, the conductive member 29 does not extend in the direction of the surface on which the conductive sheet 292 is not wound.
This is because the conductive sheet 292 has no or low elasticity, and thus, by attaching such a conductive sheet 292 to a specific surface of the elastic member 291, the elasticity of the elastic member 291 is reduced. This is because control becomes possible.

  For example, as shown in FIG. 11, when the conductive sheet 292 is wound around the elastic member 291, the deformation of the conductive member 29 extending in the x direction is prevented. This is because the length Lx of the conductive sheet 292 in the x direction is kept constant.

  On the other hand, with respect to the deformation of the conductive member 29 in the y direction, the deformation such that the conductive member 29 extends in the y direction is allowed on condition that the circumference 2Ly + 2Lz of the conductive sheet 292 is constant.

  In this manner, the conductive member 29 that extends only in a predetermined direction when pressure is applied from the substrate 31 and the operation panel 251 can be realized.

(Embodiment 3)
Next, the touch switch 25 of the image display device 100 according to the second embodiment of the present invention will be described with reference to FIGS.
FIG. 13 is an explanatory diagram showing the structure of a conventional touch switch 25. FIG. 14 is an explanatory diagram illustrating the structure of the touch switch 25 according to the third embodiment.

  When the light receiving section 21 and the indicator light 24 are provided in the conventional touch switch 25, these elements cannot be directly bonded to the glass 26. Therefore, as shown in FIG. 37 two-part configurations.

In FIG. 13, a substrate 31 provided with electrodes 30A and 30B is bonded to glass 26 by an adhesive layer 33, and is connected to a control substrate 37 through a cable wiring.
The control board 37 includes the light receiving unit 21 and the indicator lamp 24 on the front surface facing the glass 26, and includes the connector 35 and the control device 36 on the rear surface.

  However, such a configuration has a problem that the cable wiring 34 is susceptible to noise and the cost is increased.

  Therefore, in order to solve such a problem, as shown in FIG. 14, the light receiving unit 21 and the indicator lamp 24 are provided in a gap created by the conductive member 29 sandwiched between the glass 26 and the substrate 31.

  By doing so, not only can a space for arranging the light receiving unit 21 and the indicator lamp 24 be secured, but also it is not necessary to provide the unstable cable wiring 34 between the board 31 and the control board 37. Sensitivity becomes very high.

(Embodiment 4)
Next, an arrangement of the GND pattern 38 of the touch switch 25 of the image display device 100 according to the third embodiment of the present invention will be described with reference to FIGS.
FIG. 15 is an explanatory diagram illustrating a problem when the GND pattern 38 is provided in the touch switch 25. FIG. 16 is an explanatory diagram illustrating the structure of the touch switch 25 according to the fourth embodiment.

  As shown in FIG. 15A, a GND pattern 38 may be provided on the substrate 31 in order to prevent the influence of noise due to electrostatic coupling with an adjacent electrode.

  However, as shown in FIG. 15B, when the GND pattern 38 is provided in the vicinity of the conductive member 29, the conductive member 29 is not connected to the electrode 30 and the GND pattern due to an operation mistake at the time of installation of the conductive member 29 or the like. If the touch switch 38 is short-circuited, the sensitivity of the touch switch 25 may be reduced, or the touch switch 25 may not operate normally.

  Therefore, in order to prevent such a problem, a GND pattern 38 is provided on the rear surface side of the substrate 31 as shown in FIG. From the viewpoint of the lines of electric force, even if the position of the GND pattern 38 comes to the rear side of the substrate 31, the physical effect is small.

  Further, by arranging the GND pattern 38 in this way, even if the arrangement of the conductive member 29 is shifted laterally due to a work error or the like, as shown in FIG. Problems caused by short circuits can be avoided.

(Other embodiments)
1. In the first to fourth embodiments, the conductive member 29 is not limited to the rectangular parallelepiped shape, and may be, for example, a column, a semi-column, or a combination thereof. (Embodiment 5)

  In this way, it is possible to provide an optimal conductive member 29 according to the area and shape of the electrode 30.

2. In the first to fifth embodiments, the conductive member 29 may use an elastic body such as rubber or resin, or the elastic body itself may have conductivity. (Embodiment 6)

  This makes it possible to provide an optimal conductive member 29 according to the structure of the touch switch 25.

As mentioned above,
(I) An image display device according to the present invention includes an electrostatic capacitance type touch switch that detects a finger and performs switching based on a change in capacitance generated when the finger approaches a panel. The touch switch includes the panel, a substrate on which an electrode for detecting capacitance is mounted, and a conductive member corresponding to the electrode, wherein the conductive member includes the panel and the electrode. And is fixed between the panel and the electrode.

In the present invention, an “image display device” is a device that displays an image or a video such as a moving image, a still image, or a 3D image. And a touch switch for performing a power on / off operation, a menu screen display operation, and the like by touching the touch panel.
Examples of the image display device include a television, a personal computer (PC), a public display, a monitor, and a display such as an electronic blackboard.
Further, the present invention is not limited to the stationary image display device, and may be a portable image display device such as a smartphone or a tablet terminal.

  “When a finger approaches the panel” is not limited to a finger, but may be a pen tip or the like.

Further, a preferred embodiment of the present invention will be described.
(Ii) The image display device according to the present invention, further includes a capacitance detection sheet, wherein the panel has a larger area than the capacitance detection sheet, and the panel has an area other than the area of the capacitance detection sheet. May have a configuration in which the touch switch is arranged in the region of the above.

  According to this configuration, a part of the panel can be effectively used by configuring the touch switch by using a part of the panel as a panel for a touch switch, and the capacitance detection sheet can be used for the panel for a touch switch. Is unnecessary, so that the cost can be significantly reduced. Further, the assembling work of the image display device with the touch switch is also facilitated.

(Iii) In the image display device according to the present invention, the substrate has the two or more electrodes mounted thereon, and the conductive member is separated from the panel and the electrode by a predetermined distance from another conductive member. May be provided between them.

  With this configuration, the conductive member is provided between the panel and the electrodes at a predetermined interval from the other conductive members, so that the coupling strength of the capacitance between the electrodes is reduced. It is possible to realize an image display device provided with a touch switch that reduces the occurrence of unintended erroneous operation due to the coupling of the capacitance in the panel with a simple structure and at low cost.

  (Iv) In the image display device according to the present invention, when the conductive member is provided between the panel and the electrode, the conductive member deforms in a predetermined direction by receiving pressure from the panel and the electrode. You may.

  With this configuration, when a conductive member is deformed in a specific direction when pressure is applied from the panel and the electrode, the conductive member is deformed when the conductive member is incorporated between the panel and the substrate. It is possible to prevent the conductive member from unintentionally coming into contact with another electrode, element, or the like.

(V) In the image display device according to the present invention, the substrate has two or more electrodes mounted thereon, and when one of the conductive members receives pressure from the panel and the electrodes, the one conductive member is deformed in a direction in which the one conductive member is deformed. The one conductive member may be arranged on the substrate so that the other conductive member is not positioned.

  According to this configuration, when the conductive member is incorporated between the panel and the electrode, the conductive member is oriented and arranged so that the other conductive member is not positioned in the direction in which the conductive member is deformed. The member can be prevented from being deformed and coming into contact with another conductive member in advance.

  (Vi) In the image display device according to the present invention, the conductive member is formed by winding a conductive sheet on a predetermined surface of an elastic body having a rectangular parallelepiped, a cylinder, a semi-cylindrical shape, or a combination thereof. The elastic body may include at least one of urethane foam, rubber and resin, and may be fixed between the panel and the electrode when pressure is applied from the panel and the electrode.

  With this configuration, a conductive member that is deformed in a specific direction can be easily realized only by winding the conductive sheet around the elastic body.

(Vii) In the image display device according to the present invention, a ground pattern for preventing noise from the outside to the electrodes may be provided on a surface of the substrate opposite to the surface on which the electrodes are provided.

  With this configuration, by providing the ground pattern on the substrate on the side opposite to the electrode, even if the conductive member is displaced from the electrode due to a work error or the like, there is no short circuit due to contact with the guard ground pattern. .

  (Viii) In the image display device according to the present invention, when the conductive member is provided between the panel and the electrode, the conductive member is provided so as to generate a gap having a predetermined size between the panel and the substrate. And an element may be provided on the substrate having the gap.

  In this way, by disposing the indicator LED and the IR light receiving section in the gap between the panel and the corresponding board, it is not necessary to separate the sensor board from the control board, so that unstable cable wiring is eliminated. This increases sensitivity and eliminates the need for a sensor sheet, so that costs such as a mold cost and a mouse cost can be reduced.

A preferred embodiment of the present invention also includes a combination of any of the above-described embodiments.
There may be various modifications of the present invention other than the above-described embodiment. These modifications are not to be construed as not belonging to the scope of the present invention. The present invention should include meanings equivalent to the claims and all modifications within the scope.

10: microcomputer, 11: signal detector, 12: scaler, 13: image memory, 14: image display, 15: nonvolatile memory, 16: volatile memory,
17: backlight, 18: power supply unit, 19: DC-DC converter,
20: timer, 21: light receiving section, 22: communication section, 23: input terminal section, 24: indicator light, 25: touch switch, 26: glass, 27: AG film, 28: ink, 29, 29A, 29B: conductive 30, 30A, 30B: electrode, 31, 32: board, 33: adhesive layer, 34: cable wiring, 35: connector, 36: control device, 37: control board, 38: GND pattern, 100: image display device Reference numeral 101: display unit, 102: operation unit, 103: support unit, 140: setting screen, 141: capacitance detection sheet, 231, 232, 233, 234: input terminal, 251: operation panel unit, 252: electrode Part, 291: elastic member, 292: conductive sheet, DA, LA, RA: arrow, RT1, RT2: path

Claims (6)

A panel, a capacitance detection sheet that detects a change in capacitance that occurs when a finger approaches the panel, and a capacitance-type sheet that detects and switches the finger based on the change in capacitance. With a touch switch,
The panel is made of one piece of glass without holes,
An image display device, wherein the one glass is commonly used as a display area of an image corresponding to the capacitance detection sheet and an operation area including the touch switch. It further includes a substrate on which electrodes for detecting capacitance are mounted,
The display area of the image, the capacitance detection sheet and an image display panel are sequentially provided on the back surface of the glass,
2. The image display device according to claim 1, wherein the operation area includes a conductive member corresponding to the electrode, the electrode, and the substrate sequentially provided on a back surface of the glass. 3.   The image display device according to claim 1, wherein the operation of the touch switch includes at least one of a power on / off operation and a menu screen display operation.   The image display device according to claim 1, wherein the touch switch is configured by sandwiching the conductive member between the glass and the substrate. The substrate mounts two or more electrodes,
The two or more electrodes are configured such that when a finger touches the glass corresponding to one electrode, a linear path connecting the finger and another electrode located next to the one electrode is formed by air. The image display device according to claim 1, wherein the image display device is disposed on the substrate at a predetermined interval and a predetermined thickness so as to be blocked by a gap.   The image display device according to any one of claims 1 to 5, wherein a ground pattern for preventing noise from outside to the electrodes is provided on a surface of the substrate opposite to a surface on which the electrodes are provided. .