JP2019091401A - Detecting device and display device - Google Patents

Abstract

To provide a detecting device and a display device which can satisfactorily carry out touch detection and hover detection.SOLUTION: A detecting device has a substrate, a plurality of detection electrodes, a driving circuit, a plurality of pieces of wiring, a plurality of analog front ends, and a multiplexer. The plurality of detection electrodes are disposed, in a sensor region of the substrate, in a matrix fashion in a first direction and a second direction perpendicular to the first direction. The plurality of pieces of wiring are electrically connected to the plurality of detection electrodes, respectively. Each of the plurality of pieces of wiring is extended along the second direction. The plurality of pieces of wiring are disposed in parallel so as to cross the first direction. The analog front end receives, from the detection electrode, a detection signal in response to a change in capacity of the detection electrode caused when a drive signal is supplied to a detection electrode. The multiplexer is connected to one detection electrode through one wiring and can change the number of wiring simultaneously electrically connected to one analog front end.SELECTED DRAWING: Figure 13

Description

  The present invention relates to a detection device and a display device.

  In recent years, a touch detection device capable of detecting an external proximity object, which is called a so-called touch panel, has attracted attention. The touch panel is mounted or integrated on a display device such as a liquid crystal display device, and used as a display device with a touch detection function (see, for example, Patent Document 1). In such a display device, in addition to a touch detection function for detecting a touch of the operator's finger on the screen, hover detection (proximity detection for detecting a proximity state or a gesture or the like when the finger is not touching the screen) ) Is known.

JP, 2009-244958, A Unexamined-Japanese-Patent No. 2017-0592262

  In touch detection and hover detection, the distance between a detection object such as a finger to be detected and a detection electrode to be detected and the required sensitivity associated therewith are largely different. Therefore, if the electrode for touch detection and the drive configuration are adopted as they are for hover detection, it may be difficult to perform hover detection well.

  An object of the present invention is to provide a detection device and a display device capable of favorably performing touch detection and hover detection.

  The detection device according to one aspect includes a substrate, a plurality of detection electrodes arranged in a matrix in a first direction and a second direction intersecting the first direction in a sensor region of the substrate, and a drive signal to the detection electrodes. And a plurality of wirings electrically connected to each of the plurality of detection electrodes, and a detection signal corresponding to a change in capacitance of the detection electrodes when the drive signal is supplied. The number of wires electrically connected to one analog front end can be changed by connecting the analog front end received from the detection electrode and the one detection electrode via the one wire And the plurality of wirings extend along the second direction, and the plurality of wirings are arranged side by side along the first direction.

  A display device according to another aspect includes a display device including a detection device and a display region, the detection electrode is provided in a region overlapping with the display region, the detection device includes a substrate, and the substrate. A plurality of detection electrodes arranged in a matrix in a first direction and a second direction intersecting the first direction, a drive circuit for supplying a drive signal to the detection electrodes, and the plurality of detection electrodes And an analog front end that receives from the detection electrode a plurality of wires electrically connected to each of the plurality of wirings, and a detection signal corresponding to a change in capacitance of the detection electrode when the drive signal is supplied. A multiplexer connected to one of the detection electrodes via one of the wires and capable of changing the number of wires electrically connected simultaneously to one of the analog front ends; For example, each of the plurality of wires extends along said second direction, said plurality of wires are arranged side by side over the first direction.

FIG. 1 is a block diagram showing a configuration example of a detection device and a display device according to the first embodiment. FIG. 2 is a block diagram showing a configuration example of a detection circuit. FIG. 3 is an explanatory view showing an existing state for explaining the basic principle of self-capacitance detection. FIG. 4 is a diagram illustrating an example of a drive signal of self-capacitance detection and a waveform of the detection signal. FIG. 5 is a cross-sectional view illustrating a schematic cross-sectional structure of the detection device and the display device of the first embodiment. FIG. 6 is a plan view schematically showing an array substrate. FIG. 7 is a circuit diagram showing the pixel arrangement of the display area according to the first embodiment. FIG. 8 is a perspective view showing an arrangement example of detection electrodes. FIG. 9 is an explanatory diagram of an example of hover detection according to the first embodiment. FIG. 10 is an explanatory diagram of another example of the hover detection according to the first embodiment. FIG. 11 is a diagram showing the positional relationship between the detection electrode and the detection subject. FIG. 12 is an explanatory diagram for describing a capacitance according to the distance between the detection electrode and the detection subject. FIG. 13 is a plan view schematically showing the relationship between the detection electrode and the connection circuit. FIG. 14 is an explanatory view for explaining a connection circuit. FIG. 15 is an explanatory diagram for describing a specific configuration of the multiplexer shown in FIG. FIG. 16A is an explanatory diagram for describing a state in which detection electrodes to which a drive signal for detection is supplied are sequentially switched. FIG. 16B is an explanatory diagram for describing a state in which detection electrodes to which a drive signal for detection is supplied are sequentially switched. FIG. 16C is an explanatory diagram for describing a state in which the detection electrodes to which the drive signal for detection is supplied are sequentially switched. FIG. 16D is an explanatory diagram for describing a state in which detection electrodes to which a drive signal for detection is supplied are sequentially switched. FIG. 17 is a timing waveform chart showing an operation example of the display device according to the first embodiment. FIG. 18 is an explanatory view for explaining a connection circuit in a state where a plurality of detection electrodes are connected to one analog front end. FIG. 19 is an explanatory view for explaining a detection electrode block. FIG. 20 is a flowchart illustrating an operation example of the display device according to the first embodiment. FIG. 21 is a graph schematically showing the relationship between the detection electrode block and the signal strength. FIG. 22 is a flowchart illustrating an operation example of the display device according to the second embodiment. FIG. 23 is a schematic explanatory view for explaining a change in the state of the detection electrode connected to the analog front end. FIG. 24 is an explanatory view for explaining an analog front end to which each detection electrode block is connected when the detection electrodes are electrically bundled in 4 × 4 to constitute the detection electrode block. FIG. 25 is an explanatory view for explaining an analog front end to which each detection electrode block is connected when the detection electrodes are electrically bundled in 2 × 2 to constitute the detection electrode block. FIG. 26A is an explanatory diagram for describing a state in which detection electrodes to which a drive signal for detection is supplied are sequentially switched. FIG. 26B is an explanatory diagram for describing a state in which the detection electrodes to which the drive signal for detection is supplied are sequentially switched. FIG. 26C is an explanatory diagram for describing a state in which the detection electrodes to which the drive signal for detection is supplied are sequentially switched. FIG. 26D is an explanatory diagram for describing a state in which detection electrodes to which a drive signal for detection is supplied are sequentially switched. FIG. 27 is a flowchart illustrating an operation example of the display device according to the third embodiment. FIG. 28 is a schematic explanatory view for explaining a change in the state of the detection electrode connected to the analog front end. FIG. 29 is a flowchart illustrating an operation example of a display device according to a modification of the third embodiment. FIG. 30 is a schematic explanatory view for explaining changes in the state of detection electrodes connected to the analog front end in the modification of the third embodiment. FIG. 31 is an explanatory diagram of an example of an area where touch detection is performed. FIG. 32 is a schematic explanatory view for explaining changes in the state of detection electrodes connected to the analog front end of the fourth embodiment. FIG. 33 is an explanatory diagram for explaining the connection circuit of the fourth embodiment. FIG. 34 is a schematic explanatory view for explaining a change in the connection circuit of the fourth embodiment in the 2 × 2 bundle hover detection. FIG. 35 is a schematic explanatory view for explaining a change in the state of the connection circuit of the fourth embodiment in the first state in which the detection electrodes are sequentially switched. FIG. 36 is a schematic explanatory view for explaining a change in the state of the detection electrode connected to the analog front end of the fifth embodiment. FIG. 37 is an explanatory diagram for explaining a connection circuit of the fifth embodiment. FIG. 38 is a schematic explanatory diagram for describing changes in the state of the connection circuit of the fifth embodiment in the second state in which the detection electrodes are sequentially switched. FIG. 39 is a schematic explanatory view for explaining changes in the connection circuit of the fifth embodiment in the 2 × 2 bundle hover detection. FIG. 40 is a schematic explanatory view for explaining changes in the connection circuit of the fifth embodiment in the first state in which the detection electrodes are sequentially switched. FIG. 41 is a plan view schematically showing the relationship between the detection electrode and the connection circuit according to the sixth embodiment.

  A mode (embodiment) for carrying out the present invention will be described in detail with reference to the drawings. The present disclosure is not limited by the contents described in the following embodiments. Further, the components described below include those which can be easily conceived by those skilled in the art and those which are substantially the same. Furthermore, the components described below can be combined as appropriate. The disclosure is merely an example, and it is naturally included within the scope of the present disclosure as to what can be easily conceived of by those skilled in the art as to appropriate changes while maintaining the gist of the present disclosure. In addition, the drawings may be schematically represented with respect to the width, thickness, shape, etc. of each portion in comparison with the actual embodiment in order to clarify the description, but this is merely an example, and the interpretation of the present disclosure It is not limited. Further, in the present disclosure and the respective drawings, the same components as those described above with reference to the drawings in the drawings may be denoted by the same reference numerals, and the detailed description may be appropriately omitted.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration example of a detection device and a display device according to the first embodiment. FIG. 2 is a block diagram showing a configuration example of a detection circuit. As shown in FIG. 1, the display device 1 includes a display panel 10, a control circuit 11, and a detection circuit 40. The display panel 10 includes a display area 20 for displaying an image, and a sensor area 30 included in a detection device for detecting a touch input. The block diagrams shown in FIGS. 1 and 2 conceptually illustrate the configuration, and may be other configurations.

  The display panel 10 is a display device in which the display area 20 and the sensor area 30 are integrated. Specifically, in the display panel 10, a part of a member such as an electrode of the display area 20 or a substrate is also used as an electrode or a substrate of the sensor area 30.

  The display area 20 uses a liquid crystal display element as a display element. The display area 20 includes a plurality of pixels having a display element and has a display surface facing the plurality of pixels. Further, the display area 20 receives an input of a video signal and displays an image consisting of a plurality of pixels on the display surface. The display area 20 may be, for example, an organic EL display panel.

  The display panel 10 further includes a connection circuit 18. The connection circuit 18 is provided between the sensor area 30 and the detection circuit 40. The connection circuit 18 is a circuit that switches connection and disconnection between the detection electrode DE to be detected and driven and the detection circuit 40 based on the control signals Vsc1 and Vsc2 supplied from the control circuit 11. The connection circuit 18 has an analog front end SC described later.

  The control circuit 11 includes a gate driver 12, a source driver 13 and a drive circuit 14. The control circuit 11 supplies control signals to the gate driver 12, the source driver 13, the drive circuit 14, the connection circuit 18 and the detection circuit 40 based on the video signal Vdisp supplied from the outside, thereby performing display operation and detection operation. It is a circuit to control.

  The gate driver 12 supplies a scanning signal Vscan to one horizontal line to be subjected to display driving of the display panel 10 based on a control signal supplied from the control circuit 11. Thereby, one horizontal line to be displayed and driven is sequentially or simultaneously selected.

  The source driver 13 is a circuit that supplies the pixel signal Vpix to each sub-pixel SPix (see FIG. 7) in the display area 20. Some of the functions of the source driver 13 may be mounted on the display panel 10. In this case, the control circuit 11 may generate the pixel signal Vpix and supply the pixel signal Vpix to the source driver 13.

  The drive circuit 14 is a circuit that supplies a drive signal VCOM for display to the detection electrodes DE of the display panel 10. Further, the drive circuit 14 supplies a drive signal Vself to the detection electrode DE to be a common electrode of the display panel 10 through the connection circuit 18.

  In the present embodiment, the control circuit 11 performs a display mode in which display is performed by the display area 20 and a detection mode in which an object to be detected is detected in the sensor area 30 in a time division manner. The control circuit 11 has two detection modes of touch detection (first detection mode) and hover detection (second detection mode) as detection modes. Alternatively, the first detection mode and the second detection mode are self-capacitance detection modes. In the present disclosure, the touch detection detects the position of the detection object in a state in which the detection object is in contact with the detection surface or the display surface or in a state close enough to view as contact (hereinafter referred to as “contact state”). Represents to do. In addition, the hover detection is a state in which the detected body is not in contact with the detection surface or the display surface, or in a state in which the detected body is not close enough to view as contact (hereinafter referred to as “non-contact state”). Represents detecting the position or movement of In addition, when there is no detected object at a position facing the detection surface or display surface, or when the detected object is separated from the display surface to such an extent that the detected object can not be detected in hover detection, Represent. In addition, when an object to be detected exists at a position facing the detection surface or the display surface, or a state in which the object to be detected is separated from the display surface to such an extent that the object can be detected in hover detection .

  The touch sensor of the sensor area 30 includes a function of detecting the position of the detection object in contact with or in proximity to the detection surface or the display surface of the display panel 10 based on the detection principle of the detection object by the self-capacitance method. . The display panel 10 outputs a detection signal Vdet to the detection circuit 40 when the touch or proximity of the detection target is detected.

  The connection circuit 18 switches connection and disconnection between the detection circuit 40 and the detection electrode DE. Thereby, in the touch detection, the detection electrodes DE are individually connected to the detection circuit 40, and in the hover detection, the plurality of detection electrodes DE are collectively connected to the detection circuit 40 as a detection electrode block DEB (see FIG. 6). The detection signal Vdet output from the detection electrode DE is supplied to the detection circuit 40 via the connection circuit 18.

  Detection circuit 40 detects the display surface of display panel 10 based on drive signal Vself supplied from drive circuit 14 and detection signal Vdet output from display panel 10 in self-capacitive touch detection. It is a circuit which detects the to-be-detected body which approached the detection surface as a surface. When there is a touch, the detection circuit 40 obtains coordinates at which a touch input is performed.

  As shown in FIG. 2, the detection circuit 40 includes an A / D conversion circuit 43, a signal processing circuit 44, a coordinate extraction circuit 45, and a detection timing control circuit 46. The detection timing control circuit 46 controls the A / D conversion circuit 43, the signal processing circuit 44, and the coordinate extraction circuit 45 to operate in synchronization on the basis of the control signal supplied from the drive circuit 14.

  The drive circuit 14 supplies a drive signal Vself to a detection electrode DE described later via the analog front end SC of the connection circuit 18 (see FIG. 1). The detection circuit 40 is supplied with a detection signal Vdet from a detection electrode DE to be described later via the analog front end SC. The analog front end SC suppresses noise of the supplied detection signal Vdet, and performs signal adjustment such as amplifying a signal component. The A / D conversion circuit 43 samples each analog signal output from the analog front end SC and converts it into a digital signal at a timing synchronized with the drive signal Vself.

  The signal processing circuit 44 is a logic circuit that detects the presence or absence of a touch on the display panel 10 based on the output signal of the A / D conversion circuit 43. The signal processing circuit 44 performs processing for extracting a signal (absolute value | ΔV |) of a difference between detection signals of the finger. The signal processing circuit 44 compares the absolute value | ΔV | with a predetermined threshold voltage, and if the absolute value | ΔV | is less than the threshold voltage, it determines that the object to be detected is absent. On the other hand, when the absolute value | ΔV | is equal to or higher than the threshold voltage, the signal processing circuit 44 determines that the detection object is present. Thus, the detection circuit 40 can perform touch detection or hover detection.

  The coordinate extraction circuit 45 is a logic circuit that obtains the coordinates of the detection object when the signal detection circuit 44 detects the detection object. The coordinate extraction circuit 45 outputs the coordinates of the object to be detected as an output signal Vout. The coordinate extraction circuit 45 may output the output signal Vout to the control circuit 11. The control circuit 11 can execute a predetermined display operation or detection operation based on the output signal Vout.

  The A / D conversion circuit 43 of the detection circuit 40, the signal processing circuit 44, the coordinate extraction circuit 45, and the detection timing control circuit 46 are mounted on the display device 1. However, the present invention is not limited to this, and all or part of the functions of the detection circuit 40 may be mounted on an external processor or the like. For example, the coordinate extraction circuit 45 may be mounted on an external processor other than the display device 1, and the detection circuit 40 may output the signal processed by the signal processing circuit 44 as the output signal Vout.

  The display panel 10 is subjected to touch control based on the basic principle of capacitive touch detection. Here, with reference to FIG. 3 and FIG. 4, the basic principle of detection of an object to be detected by the self-capacitance method of the display panel 10 of the present embodiment will be described. FIG. 3 is an explanatory view showing an existing state for explaining the basic principle of self-capacitance detection. FIG. 4 is a diagram illustrating an example of a drive signal of self-capacitance detection and a waveform of the detection signal. FIG. 3 also shows a detection circuit. In addition, although the case where a to-be-detected body is a finger is demonstrated in the following description, a to-be-detected body is not restricted to a finger, For example, an object containing conductors, such as a stylus pen, may be sufficient.

In the absence state, an alternating current rectangular wave Sg having a predetermined frequency (for example, about several kHz to several hundreds kHz) is applied to the detection electrode E1. The detection electrode E1 has a capacitance C1, and a current corresponding to the capacitance C1 flows. The voltage detector DET converts the fluctuation of the current according to the AC rectangular wave Sg into the fluctuation of the voltage (waveform V _{0 in} solid line (see FIG. 4)).

Next, as shown in FIG. 3, in the presence state of the detection subject, a capacitance C2 between the finger and the detection electrode E1 is added to the capacitance C1 of the detection electrode E1. Therefore, when the AC rectangular wave Sg is applied to the detection electrode E1, a current flows according to the electrostatic capacitance C1 and the electrostatic capacitance C2. As shown in FIG. 4, the voltage detector DET converts the fluctuation of the current according to the AC rectangular wave Sg into the fluctuation of the voltage (waveform V _{1 of a} dotted line). Then, the presence of the object to be detected is measured based on the absolute value | ΔV | of the difference between the waveform V ₀ and the waveform V ₁ .

Specifically, in FIG. 4, the AC rectangular wave Sg at time T ₀₁ rises to a voltage level corresponding to the voltage V _2. At this time, the switch SW1 is a switch SW2 turned on is also the potential of the detection electrodes E1 to become off rises to voltage V _2. Then to turn off the switch SW1 in front of the timing of time _{T 11.} In this case although the detection electrodes E1 are in a floating state, the capacitance C1 (or C1 + C2, see Fig. 3) of the detection electrodes E1, the potential of the detection electrodes E1 are _{V 2} is maintained. Furthermore, the reset operation of the voltage detector DET prior to a timing of time T ₁₁ is performed.

Subsequently, when turning on the switch SW2 at time T _11, since the electrostatic capacitance C1 (or C1 + C2) in stored charge of the detection electrodes E1 moves to the capacitor C3 in the voltage detector DET, the voltage detection The output of the device DET rises (see the detection signal Vdet in FIG. 4). The output of the voltage detector DET (detection signal Vdet), in the absence state, next waveform _{V 0} shown by a solid line, and _{Vdet = C1 × V 2 / C3} . In the presence state, next waveform _{V 1} indicated by a dotted line, and Vdet = (C1 + C2) × V 2 / C3.

Then, turn off the switch SW2 at time T _31, by turning on the switch SW1 and the switch SW3, the reset voltage detector DET with the potential of the detection electrodes E1 to the low level of the AC rectangular wave Sg same potential Let The above operation is repeated at a predetermined frequency (for example, about several kHz to several hundreds kHz). In this manner, the detection circuit 40 can detect the presence state of the detection subject based on the basic principle of detection of the detection subject according to the self-capacitance method.

  Next, a configuration example of the display device 1 of the present embodiment will be described in detail. FIG. 5 is a cross-sectional view illustrating a schematic cross-sectional structure of the detection device and the display device of the first embodiment. As shown in FIG. 5, the display panel 10 includes an array substrate 2, an opposing substrate 3, and a liquid crystal layer 6 as a display function layer. The opposing substrate 3 is disposed to face the surface of the array substrate 2 in the direction perpendicular thereto. Further, the liquid crystal layer 6 is provided between the array substrate 2 and the counter substrate 3.

  The array substrate 2 has a first substrate 21, a pixel electrode 22, a detection electrode DE, an insulating layer 24, and a polarizing plate 35B. The first substrate 21 includes circuits such as a gate scanner included in the gate driver 12, switching elements such as TFT (Thin Film Transistor), and various wirings such as gate lines GCL and signal lines SGL (not shown in FIG. 7). ) Is provided.

  The detection electrode DE is provided on the upper side of the first substrate 21. Further, the pixel electrodes 22 are provided on the upper side of the detection electrode DE via the insulating layer 24, and a plurality of the pixel electrodes 22 are arranged in a matrix in plan view. The pixel electrode 22 is provided corresponding to the sub-pixel SPix that configures each pixel Pix (see FIG. 7) of the display panel 10, and is supplied with a pixel signal Vpix for performing a display operation. The detection electrode DE is supplied with a display drive signal VCOM during a display operation, and functions as a common electrode for a plurality of pixel electrodes 22. The polarizing plate 35 B is provided below the first substrate 21.

  In the present embodiment, for the pixel electrode 22 and the detection electrode DE, for example, a light-transmitting conductive material such as ITO (Indium Tin Oxide) is used.

  In the present specification, in the direction perpendicular to the first substrate 21, the direction from the first substrate 21 to the second substrate 31 is referred to as “upper side”. In addition, the direction from the second substrate 31 toward the first substrate 21 is referred to as “lower side”.

  The arrangement of the plurality of pixel electrodes 22 is not limited to a matrix-like arrangement arranged in a first direction and a second direction orthogonal to the first direction, and the opposing pixel electrodes 22 are arranged in the first direction or It is also possible to adopt a configuration in which it is disposed offset in the second direction. Also, due to the difference in size of the opposing pixel electrodes 22, a plurality of two or three pixel electrodes on one side of the pixel electrode 22 with respect to one pixel electrode 22 configuring the pixel row arranged in the first direction A configuration in which 22 is arranged is also possible.

  The counter substrate 3 has a second substrate 31, a color filter 32 formed on one surface of the second substrate 31, and a polarizing plate 35 A provided on the other surface of the second substrate 31. The color filter 32 faces the liquid crystal layer 6 in the direction perpendicular to the first substrate 21. The color filter 32 may be disposed on the first substrate 21. In the present embodiment, the first substrate 21 and the second substrate 31 are, for example, a glass substrate or a resin substrate.

  The first substrate 21 and the second substrate 31 are disposed to face each other at a predetermined interval. A liquid crystal layer 6 is provided between the first substrate 21 and the second substrate 31. In the liquid crystal layer 6, the alignment state of the liquid crystal molecules changes in accordance with the state of the electric field formed between the layers, whereby the transmitted light is modulated. As such an electric field mode, for example, a transverse electric field mode such as In-Plane Switching (IPS) including Fringe Field Switching (FFS) is adopted. An alignment film (not shown in FIG. 5) for determining an initial alignment state of liquid crystal molecules is formed on the outermost surface of the array substrate 2 facing the liquid crystal layer 6 shown in FIG. It is done.

  An illumination unit (backlight) not shown is provided below the first substrate 21. The illumination unit has a light source such as a light emitting diode (LED), for example, and emits light from the light source toward the first substrate 21. The light from the illumination unit passes through the array substrate 2 and is modulated by the alignment state of the liquid crystal at that position, and the transmission state to the display surface changes depending on the place. Thereby, an image is displayed on the display surface.

  FIG. 6 is a plan view schematically showing an array substrate. As shown in FIG. 6, in the display device 1, a peripheral region 10 b is provided outside the display region 10 a. In the present disclosure, the display area 10a is an area for displaying an image, and is an area overlapping with a plurality of pixels Pix (sub-pixels SPix). The peripheral area 10 b is an area inside the outer periphery of the first substrate 21 and outside the display area 10 a. The peripheral area 10b may have a frame shape surrounding the display area 10a. In this case, the peripheral area 10b can be said to be a frame area.

  In the present embodiment, the first direction Dx is a direction along the short side of the display area 10a. The second direction Dy is a direction orthogonal to the first direction Dx. The second direction Dy may intersect with the first direction Dx at an angle other than 90 °. The plane defined by the first direction Dx and the second direction Dy is parallel to the surface of the first substrate 21. A third direction Dz intersecting the first direction Dx and the second direction Dy is the thickness direction of the first substrate 21.

  As shown in FIG. 6, a plurality of detection electrodes DE are arranged in a matrix in the first direction Dx and the second direction Dy in the display area 10a. Each detection electrode DE is rectangular or square in a plan view. The detection electrode DE is made of, for example, a translucent conductive material such as ITO (Indium Tin Oxide).

  A plurality of pixel electrodes 22 are arranged in a matrix at positions corresponding to one detection electrode DE. The pixel electrode 22 has an area smaller than that of the detection electrode DE. Although FIG. 6 shows a part of the detection electrodes DE and the pixel electrodes 22, the detection electrodes DE and the pixel electrodes 22 are disposed over the entire display region 10a. As described above, the detection electrode DE is provided in the area overlapping with the display area 10a. Further, in the present disclosure, the row direction is also referred to as a first direction Dx, and the column direction is also referred to as a second direction Dy.

  The arrangement of the plurality of pixel electrodes 22 is not limited to a matrix-like arrangement arranged along the first direction Dx and the second direction Dy intersecting the first direction Dx, and the opposing pixel electrodes 22 are not It is also possible to adopt a configuration in which it is disposed to be shifted in the one direction Dx or the second direction Dy. Also, due to the difference in size of the opposing pixel electrodes 22, a plurality of two or three pixels on one side of the pixel electrode 22 with respect to one pixel electrode 22 configuring a pixel row arranged in the first direction Dx A configuration in which the electrodes 22 are arranged can also be employed.

  A connection circuit 18 and an integrated circuit 19 are provided on the short side of the peripheral region 10b. In addition, a flexible substrate (not shown) is connected to the short side of the peripheral region 10b. The flexible substrate 71 is provided with an integrated circuit of a detection circuit. The integrated circuit 19 includes a control circuit 11 and a detection circuit 40 as shown in FIG. In addition, a part of the function of the detection circuit 40 may be included in another integrated circuit for detection, or may be provided as a function of an external MPU (Micro-Processing Unit). The integrated circuit 19 is not limited to this, and may be provided on, for example, a control board outside the module.

  The detection electrode DE is electrically connected to the integrated circuit 19 through the wiring 51 and the connection circuit 18. The plurality of wirings 51 are respectively electrically connected to the plurality of detection electrodes DE disposed in the display area 10a, and are drawn out to the peripheral area 10b. Each of the plurality of wires 51 extends along the second direction Dy, and the plurality of wires 51 are arranged side by side along the first direction Dx. For example, the drive circuit 14 (see FIG. 1) incorporated in the integrated circuit 19 is connected to the plurality of detection electrodes DE via the connection circuit 18 disposed in the peripheral region 10 b and the wiring 51.

  Next, the display operation of the display panel 10 will be described. FIG. 7 is a circuit diagram showing the pixel arrangement of the display area according to the first embodiment. On the first substrate 21 (see FIG. 5), the switching elements Tr, the signal lines SGL, the gate lines GCL and the like of the sub-pixels SPix shown in FIG. 7 are formed. The signal line SGL is a wiring for supplying the pixel signal Vpix to each pixel electrode 22. The gate line GCL is a wiring for supplying a drive signal for driving each switching element Tr. The signal line SGL and the gate line GCL extend in a plane parallel to the surface of the first substrate 21.

  The display area 20 shown in FIG. 7 has a plurality of sub-pixels SPix arranged in a matrix. The sub-pixels SPix each include a switching element Tr and a liquid crystal LC. The switching element Tr is configured by a thin film transistor, and in this example, is configured by an n-channel MOS (Metal Oxide Semiconductor) type TFT. An insulating layer 24 is provided between the pixel electrode 22 and the detection electrode DE, thereby forming a storage capacitance Cs shown in FIG.

  The gate driver 12 shown in FIG. 1 sequentially selects the gate line GCL. The gate driver 12 applies the scan signal Vscan to the gate of the switching element Tr of the sub-pixel SPix via the selected gate line GCL. Thus, one row (one horizontal line) of the sub-pixels SPix is sequentially selected as a display drive target. In addition, the source driver 13 supplies the pixel signal Vpix to the sub-pixel SPix configuring the selected one horizontal line via the signal line SGL. In each of the sub-pixels SPix, display is performed for each horizontal line according to the supplied pixel signal Vpix.

  When performing this display operation, the drive circuit 14 applies a display drive signal VCOM to all the detection electrodes DE. The display drive signal VCOM is a voltage signal which is a common potential for the plurality of sub-pixels SPix. Thus, each detection electrode DE functions as a common electrode for the pixel electrode 22 at the time of display operation. At the time of display, the drive circuit 14 applies the drive signal VCOM to all the detection electrodes DE of the display area 10a.

  In the color filter 32 shown in FIG. 5, for example, color regions of color filters colored in three colors of red (R), green (G), and blue (B) may be periodically arranged. The three color regions 32R, 32G, and 32B of R, G, and B are associated with each sub-pixel SPix shown in FIG. 7 described above as one set. Then, the pixel Pix is configured with the subpixels SPix corresponding to the three color regions 32R, 32G, and 32B as one set. The color filter 32 may include four or more color regions.

  FIG. 8 is a perspective view showing an arrangement example of detection electrodes. As shown in FIG. 8, an outer edge wiring DE-G is provided in the peripheral region 10 b on the side of one surface 21 a of the first substrate 21. For example, the outer edge wiring DE-G is provided continuously along the long side and the short side of the display area 10a, and surrounds the display area 10a. When the display device 1 detects the presence state of the detection subject, a guard signal Vgd having the same waveform as that of the drive signal Vself for detection and synchronized with the drive signal Vself is supplied to the outer edge wiring DE-G. It is also good. Alternatively, the outer edge wiring DE-G may be set to a state (high impedance) where it is not electrically connected anywhere. According to this, generation of electrostatic capacitance between the outer edge wiring DE-G and the detection electrode DE to which the drive signal Vself is supplied can be prevented, so that the detection sensitivity of the detection subject can be enhanced. .

  In the present embodiment, the outer edge wiring 29 may be provided on the other surface 21 b side of the first substrate 21. The outer edge wiring 29 on the back surface may cover a part of the other surface 21 b of the first substrate 21 or may cover the entire other surface 21 b. Further, the outer edge wiring 29 on the back surface may be made of, for example, a light-transmitting conductive material such as ITO, or may be made of a metal frame (not shown) or the like. When the display device 1 detects the presence state of the detection subject, a guard signal Vgd having the same waveform as the detection drive signal Vself and synchronized with the drive signal Vself is supplied to the outer edge wiring 29 on the back surface. It is also good. Alternatively, the outer edge wire 29 on the back surface may be set to a state (high impedance) in which it is not electrically connected anywhere. According to this, since electrostatic capacitance can be prevented from being generated between the outer edge wiring 29 on the back surface and the detection electrode DE to which the drive signal Vself is supplied, it is possible to enhance the sensitivity of the hover detection.

  FIG. 9 is an explanatory view showing an example of hover detection according to the embodiment. FIG. 10 is an explanatory view showing another example of hover detection according to the embodiment. As shown in FIG. 9, the display device 1 performs hover detection in a non-contact state with the finger of the operator who is the detected body with respect to the detection surface DS. The detection circuit 40 can detect the distance D1 between the detection surface DS and the object in the direction perpendicular to the detection surface DS based on the detection signal Vdet. Further, the detection circuit 40 can detect the position R1 of the detection subject based on the detection signal Vdet. The position R1 of the body to be detected is, for example, a position facing the body to be detected in the direction perpendicular to the detection surface DS, and the detection electrode having the largest value among the detection signals Vdet from the plurality of detection electrode blocks DEB. This position corresponds to the block DEB.

  Further, as shown in FIG. 10, the display device 1 can detect an operation such as a gesture of a detected object. The detection circuit 40 calculates a change in the position of the object to be detected based on the detection signal Vdet when the object to be detected moves in the direction of the arrow Da without contact with the detection surface DS. Thereby, the detection circuit 40 detects an operation such as a gesture of the detection subject. The control circuit 11 (see FIG. 1) executes a predetermined display operation or detection operation based on the result of the hover detection.

  FIG. 11 is a diagram showing the positional relationship between the detection electrode and the detection subject. FIG. 12 is an explanatory diagram for describing a capacitance according to the distance between the detection electrode and the detection subject. As shown in FIG. 11, when the detection subject CQ approaches the detection electrode DE, it becomes easy to obtain a detection signal. When the to-be-detected body CQ moves away from the detection electrode DE, the SN ratio of the detection signal and the noise decreases, which makes it difficult to detect the to-be-detected body CQ.

  As shown in FIG. 12, in the case where the distance between the detection surface DS and the detection subject CQ with respect to the third direction Dz is the distance D1 (step ST101), the detection subject CQ is relative to the detection surface DS of the display device 1. In a non-contact state. A capacitance C2a is formed between the detection subject CQ and the detection electrode DE.

  Even when the distance between the detection surface DS and the detection subject CQ is the distance D2 (step ST102), the detection subject CQ is in a non-contact state with the detection surface DS of the display device 1. Here, the distance D2 is smaller than the distance D1. A capacitance C2b is formed between the detection subject CQ and the detection electrode DE.

  When the distance between the detection surface DS and the detection target CQ is 0 (step ST103), the detection target CQ is in contact with the detection surface DS of the display device 1. Further, a capacitance C2c is formed between the detection subject CQ and the detection electrode DE.

  If the size of the detection electrode DE is the same, the capacitance C2b has a larger value than the capacitance C2a. If the size of the detection electrode DE is the same, the capacitance C2c has a larger value than the capacitance C2b. Therefore, even if the distance between the detection electrode DE and the detection subject CQ is increased, in order to maintain the detection sensitivity of the detection subject CQ, the size of the detection electrode DE may be increased. When the size of the detection electrode DE is increased, the area of one detection electrode DE occupied on the detection surface DS is increased, so that the detection accuracy is lowered. To address this issue, the display device 1 of the present embodiment includes the following detection electrodes DE and connection circuits.

  Next, the relationship between the detection electrode DE and the connection circuit 18 will be described. FIG. 13 is a plan view schematically showing the relationship between the detection electrode and the connection circuit. As shown in FIG. 13, a plurality of detection electrodes DE are arranged in a matrix. For example, a plurality of detection electrodes DE (1, 1), DE (1, 2),..., DE (1, n) are arranged in the second direction Dy. Also, a plurality of detection electrodes DE (1, 1),..., DE (m, 1) are arranged in the first direction Dx. Similarly, a plurality of detection electrodes DE (m, 1),..., DE (m, n) are arranged in the second direction Dy. Note that when it is not necessary to distinguish and describe the detection electrodes DE (1, 1),..., DE (m, n), they are simply referred to as detection electrodes DE. In the first embodiment, an example in which m is 12 and n is 16 is shown. However, the values of m and n are not limited to this. The value of m is arbitrary, and the value of n is also arbitrary.

  The detection electrode DE is made of, for example, a translucent conductive material such as ITO. The detection electrode DE is not limited to ITO, and may be made of, for example, tin oxide.

  The connection circuit 18 is a circuit that switches the connection state of the detection electrode DE. In the first embodiment, the connection circuit 18 includes a multiplexer Mu and analog front ends SC1, ..., SC48. Note that when it is not necessary to distinguish and describe the plurality of analog front ends SC1, ..., SC48, they are simply referred to as the analog front end SC.

  The multiplexer Mu is disposed on the first substrate 21 on which the detection electrode DE is located, and is outside the sensor area 30. The analog front end SC is likewise arranged on the first substrate on which the detection electrode DE is located and outside the sensor area 30. The multiplexer Mu and the analog front end SC have a small area, for example, by low temperature polysilicon (Low Temperature Polycrystalline Silicon) formed of polycrystalline silicon at low temperature.

  Each detection electrode DE and the multiplexer Mu of the connection circuit 18 are electrically connected by each wire 51. The wiring 51 of FIG. 13 is connected to each of the detection electrodes DE (1, 1), DE (1, 2),..., DE (1, n), and the other detection electrodes DE are the same. Therefore, the illustration of the wiring 51 is omitted. The multiplexer Mu is also electrically connected to the analog front end SC.

  FIG. 14 is an explanatory view for explaining a connection circuit. FIG. 15 is an explanatory diagram for describing a specific configuration of the multiplexer shown in FIG. As shown in FIG. 14, the connection circuit 18 is configured by combining a plurality of selection circuits EC which constitute the multiplexer Mu shown in FIG.

  As shown in FIG. 15, one select circuit EC has switches SW11, SW12 and SW13. The switches SW11, SW12, and SW13 are formed of, for example, n-channel MOS TFTs, and are formed on the first substrate 21.

  Each of the switches SW11, SW12 and SW13 opens and closes, whereby any one of the supply wiring of the display drive signal VCOM, the supply wiring of the guard signal Vgd and the analog front end SC is connected to one detection electrode DE in a time division manner. Ru.

  In FIG. 14, the detection electrode DE (1, 2) is connected to the analog front end SC2. The detection electrode DE (1, 4) is connected to the analog front end SC1. The detection electrode DE (3, 2) is connected to the analog front end SC4. The detection electrode DE (3, 4) is connected to the analog front end SC3.

  In FIG. 14, detection electrodes DE (1, 1), DE (1, 3), DE (2, 1), DE (2, 2), DE (2, 3), DE (2, 4), DE ( 3, 1), DE (3, 3), DE (4, 1), DE (4, 2), DE (4, 3), DE (4, 4) connect guard signal Vgd to supply wiring It is done. The guard signal Vgd has the same waveform as the detection drive signal Vself supplied to the detection electrodes DE (1, 2), DE (1, 4), DE (3, 2), DE (3, 4), and It is synchronized with the drive signal Vself. According to this, the detection electrodes DE (1, 2), DE (1, 4), DE (3, 2), DE (3, 4) and the detection electrodes DE (1, 1), DE (1, 3) ), DE (2, 1), DE (2, 2), DE (2, 3), DE (2, 4), DE (3, 1), DE (3, 3), DE (4, 1) , DE (4, 2), DE (4, 3), and DE (4, 4) can be prevented from generating a capacitance, so that the detection sensitivity of the detection subject can be enhanced.

  The number of analog front ends SC of the first embodiment is 48, and the number of detection electrodes DE is 192. The number of detection electrodes DE is greater than the number of analog front ends SC. The multiplexer Mu is connected to one detection electrode DE via one wiring 51. Therefore, the multiplexer Mu electrically connects the wires 51 one by one in time division to one analog front end SC.

  16A to 16D are explanatory diagrams for describing a state in which detection electrodes to which a drive signal for detection is supplied are sequentially switched. By the operation of each selection circuit EC shown in FIGS. 14 and 15, as shown in FIG. 16A, detection signal DE for detection is supplied to detection electrode DE (1, 2), and analog front end SC2 (FIG. 14) are connected. A guard signal Vgd is supplied to the detection electrodes DE (1, 1), DE (2, 1), DE (2, 2).

  Next, by the operation of each selection circuit EC shown in FIGS. 14 and 15, as shown in FIG. 16B, the detection electrode DE (1, 1) is supplied with the drive signal Vself for detection, and the analog front end It is connected to SC2 (see FIG. 14). A guard signal Vgd is supplied to the detection electrodes DE (1, 2), DE (2, 1), DE (2, 2).

  Next, by the operation of each selection circuit EC shown in FIGS. 14 and 15, as shown in FIG. 16C, detection signal DE (2, 2) is supplied with detection drive signal Vself, and the analog front end It is connected to SC2 (see FIG. 14). A guard signal Vgd is supplied to the detection electrodes DE (1, 1), DE (1, 2), DE (2, 1).

  Next, as shown in FIG. 16D, the detection electrode DE (2, 1) is supplied with the drive signal Vself for detection by the operation of each selection circuit EC shown in FIGS. 14 and 15, and the analog front end It is connected to SC2 (see FIG. 14). A guard signal Vgd is supplied to the detection electrodes DE (1, 1), DE (1, 2), DE (2, 2).

  As described above, the detection electrodes DE (1, 1), DE (1, 2), DE (2, 1), DE (2, 2) are detected through one analog front end SC 2 The circuit 40 can detect the self-capacitance of each detection electrode DE. In addition, although detection electrode DE (1, 1), DE (1, 2), DE (2, 1), DE (2, 2) was illustrated and demonstrated, the other detection electrode DE is the same. As a result, the size of the connection circuit 18 can be reduced.

  Next, an operation example of the present embodiment will be described with reference to FIGS. 1 and 13 to 21. FIG. 17 is a timing waveform chart showing an operation example of the display device according to the first embodiment. FIG. 18 is an explanatory view for explaining a connection circuit in a state where a plurality of detection electrodes are connected to one analog front end. FIG. 19 is an explanatory view for explaining a detection electrode block. FIG. 20 is a flowchart illustrating an operation example of the display device according to the first embodiment. FIG. 21 is a graph schematically showing the relationship between the detection electrode block and the signal strength. The operation examples shown in FIGS. 17 to 21 are merely examples and may be changed as appropriate.

  As shown in FIG. 17, the display period Pd and the detection period Pt are alternately performed in time division. The detection period Pt includes a hover detection period Pts and a touch detection period Ptm. The order of execution of the display period Pd, the hover detection period Pts, and the touch detection period Ptm is merely an example, and may be changed as appropriate. For example, only one of the hover detection period Pts and the touch detection period Ptm may be present in one detection period Pt. The touch detection of one detection surface may be performed in one touch detection period Ptm, or may be divided and performed in a plurality of touch detection periods Ptm. In addition, an image for one frame may be displayed in the display period Pd, and a plurality of display periods Pd and detection periods Pt may be alternately arranged in the display period of the image for one frame.

  As shown in FIG. 20, the control circuit 11 first executes writing of display data (step ST1). Specifically, similar to the display operation described above, the source driver 13 supplies the pixel signal Vpix to the sub-pixels SPix corresponding to the gate lines GCL1, GCL2 and GCL3 via the signal lines SGL1, SGL2 and SGL3. Do. In each of the sub-pixels SPix, display is performed for each horizontal line according to the supplied pixel signal Vpix. As shown in FIG. 17, in the display period Pd, the drive circuit 14 supplies a drive signal VCOM for display to the detection electrode DE. Further, in the connection circuit 18, the display drive signal VCOM is supplied to all the detection electrodes DE via the switch SW13 shown in FIG. The detection electrode DE is a common electrode that applies a common potential.

  Next, the control circuit 11 executes hover detection (step ST2). Specifically, as shown in FIG. 17, in the hover detection period Pts, the control circuit 11 supplies the control signal Vsc1 to the connection circuit 18, and supplies the control signal Vsc2 to the connection circuit 18. The switch SW11 (see FIG. 15) is turned on by the control signals Vsc1 and Vsc2, and the switches SW12 and SW13 (see FIG. 15) are turned off. Thereby, as shown in FIG. 13, four detection electrodes DE arranged adjacent to the first direction Dx and the second direction Dy are electrically connected to function as one detection electrode block DEB.

  For example, as shown in FIG. 18, the detection electrodes DE (1, 1), DE (1, 1), DE (2, 1), DE (2, 2) have the same analog front end in the connection circuit 18. Connected to SC2. As seen from the detection circuit 40 shown in FIG. 2, the detection electrodes DE (1, 1), DE (1, 2), DE (2, 1), DE (2, 2) are 1 as shown in FIG. One detection electrode block DEB (1, 1). That is, the detection electrodes DE (1, 1), DE (1, 1), DE (2, 1), DE (2, 2) electrically connected to the wiring 51 which can be simultaneously connected to one analog front end SC Includes at least two detection electrodes DE adjacent to a first direction Dx of the first substrate 21 or a second direction Dy intersecting the first direction Dx.

  As shown in FIG. 13, a plurality of detection electrode blocks DEB are arranged in a matrix. For example, a plurality of detection electrode blocks DEB (1, 1),..., DEB (1, N) are arranged in the second direction Dy. Further, a plurality of detection electrode blocks DEB (1, 1),..., DEB (M, 1) are arranged in the first direction Dx. Similarly, a plurality of detection electrode blocks DEB (M, 1),..., DEB (M, N) are arranged in the second direction Dy. When it is not necessary to distinguish and describe the detection electrode blocks DEB (1, 1),..., DEB (M, N), they are simply referred to as detection electrode blocks DEB. In the first embodiment, an example in which M is 6 and N is 8 is shown. However, the values of M and N are not limited to this. The value of M is arbitrary, and the value of N is also arbitrary.

  In the first embodiment, since the detection electrode block DEB is 48, each detection electrode block DEB is electrically connected by the multiplexer Mu so that it is one to one with any one of the analog front end SC1 to the analog front end SC48. It is connected.

  The drive circuit 14 supplies a drive signal Vself to the detection electrode block DEB. Thus, the display device 1 can detect the non-contact object under detection for each detection electrode block DEB. For example, the detection circuit 40 can detect the distance D1 between the detection surface DS and the detection subject in the direction perpendicular to the detection surface DS based on the detection signal Vdet from each detection electrode block DEB. Further, the detection circuit 40 can detect the position R1 of the detection subject based on the detection signal Vdet from each detection electrode block DEB. Further, the drive circuit 14 supplies a guard signal Vgd to the outer edge wiring DE-G (see FIG. 8) in the hover detection period Pts.

  Next, the detection circuit 40 determines whether the detection signal Vdet supplied from the detection electrode block DEB is equal to or higher than a predetermined threshold value ΔVth (step ST3). As shown in FIG. 21, the detection circuit 40 obtains the signal strength of the detection signal Vdet supplied from each detection electrode block DEB, and compares it with a predetermined threshold value ΔVth.

  If the signal strength of any one of the plurality of detection signals Vdet is equal to or higher than the threshold ΔVth (Yes in step ST3), the control circuit 11 executes touch detection (step ST4). If the signal strength of the detection signal Vdet is equal to or higher than the threshold value ΔVth, it is determined that the detected object is in a contact state. In the example shown in FIG. 21, in the detection electrode block DEB (4, 3), the signal strength of the detection signal Vdet is equal to or higher than the threshold ΔVth, and in the other detection electrode blocks DEB, the signal strength of the detection signal Vdet is higher than the threshold ΔVth Too small. In this case, the detection circuit 40 determines that the detection target is in the contact state at the position corresponding to the detection electrode block DEB (4, 3). The control circuit 11 switches from hover detection to touch detection based on the information from the detection circuit 40.

  Specifically, as shown in FIG. 17, in the touch detection period Ptm, the control circuit 11 supplies the control signal Vsc1 to the connection circuit 18, and supplies the control signal Vsc2 to the connection circuit 18. A state in which the switches SW11, SW12, and SW13 (see FIG. 15) operate by the control signals Vsc1 and Vsc2, and the detection electrodes DE to which the drive signal Vself for detection is supplied are sequentially switched as shown in FIGS. 16A to 16D. become.

  The drive circuit 14 sequentially supplies a drive signal Vself to the detection electrode DE. A detection signal Vdet corresponding to a change in capacitance of the detection electrode DE is supplied to the detection circuit 40 via the analog front end SC. Thereby, the display apparatus 1 can detect the to-be-detected body of a contact state for every several detection electrode DE.

  In the touch detection period Ptm, when the detection operation of one detection surface is completed, that is, when the drive signal Vself is sequentially supplied to all the detection electrodes DE to execute touch detection, the control circuit 11 performs the touch operation. The detection is ended and the process returns to the writing of display data (step ST1).

  If all the signal strengths of the plurality of detection signals Vdet are smaller than the threshold value ΔVth (No in step ST3), the control circuit 11 returns to the writing of display data (step ST1) without performing touch detection. In this case, in the detection period Pt shown in FIG. 17, only the hover detection period Pts is performed, and the touch detection period Ptm is not performed. That is, only one hover detection period Pts exists in one detection period Pt.

  Note that the signal line SGL is preferably in a floating state in the hover detection period Pts and the touch detection period Ptm. In this way, the capacitance between the detection electrode DE and the signal line SGL can be reduced. The gate line GCL may be in a floating state in the hover detection period Pts.

  As described above, the detection device of the first embodiment includes the first substrate 21, the plurality of detection electrodes DE, the drive circuit 14, the plurality of analog front ends SC, and the multiplexer Mu. The plurality of detection electrodes DE are provided in the sensor area 30 of the first substrate 21. The drive circuit 14 supplies a drive signal Vself to the detection electrode DE. The analog front end SC receives, from the detection electrode DE, a detection signal Vdet corresponding to a change in capacitance of the detection electrode DE when the drive signal Vself is supplied to the detection electrode DE. The multiplexer Mu is connected to one detection electrode DE via one wire 51, and can change the number of wires 51 simultaneously connected to one analog front end SC.

  According to the first embodiment, the detection electrode DE can be shared in the two detection modes of self-capacitive touch detection and hover detection. Furthermore, in the hover detection, good hover detection can be performed by changing the number of bundling of the detection electrodes DE in accordance with the distance between the detection electrode DE and the detection subject CQ.

  According to the above-described configuration, when the distance between the detection electrode DE and the detection subject CQ is large, the plurality of detection electrodes DE are electrically connected to be connected to one analog front end SC. As a detection electrode block DEB. As a result, the size of the apparent detection electrode DE is increased, and the detection sensitivity of the detection object CQ is improved. When the size of the detection electrode DE is increased, the area of one detection electrode DE occupied on the detection surface DS is increased, and the detection accuracy is reduced. However, the number of detection electrodes DE connected to one analog front end SC is reduced By doing this, it is possible to improve the accuracy of the position coordinates of the detection subject CQ in the existing state. As described above, the detection device according to the first embodiment can perform touch detection and hover detection favorably.

Second Embodiment
FIG. 22 is a flowchart illustrating an operation example of the display device according to the second embodiment. FIG. 23 is a schematic explanatory view for explaining a change in the state of the detection electrode connected to the analog front end. In addition, about the component demonstrated in Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The operation example shown in the first embodiment is merely an example, and may be changed as appropriate. For example, in a plurality of hover detection periods Pts, the number of detection electrodes DE that constitute one detection electrode block DEB may be changed to perform hover detection. The control circuit 11 can change the resolution of hover detection by changing the number of detection electrodes DE included in the detection electrode block DEB according to the distance D1 between the detection surface DS and the detection subject.

  Also in FIG. 22, the display period Pd and the detection period Pt described above are alternately performed in time division. The display period Pd is the same as in the first embodiment, and thus the detailed description is omitted. In the detection period Pt of the second embodiment, the detection circuit is electrically bundled in 4 × 4 by the connection circuit 18 to form a detection electrode block DEB, and the control circuit 11 executes hover detection (step ST11).

  As shown in FIG. 23, in step ST11, since the size of the detection electrode block DEB is large, the detection subject CQ can be easily detected even if the distance between the detection subject CQ and the detection electrode block DEB is large.

  FIG. 24 is an explanatory view for explaining an analog front end to which each detection electrode block is connected when the detection electrodes are electrically bundled in 4 × 4 to constitute the detection electrode block. In FIG. 24, when the 12 × 16 detection electrodes DE are electrically bundled in 4 × 4 to constitute the detection electrode block DEB, the detection electrode blocks DEB are arranged in a 3 × 4 matrix.

  In FIG. 24, the detection electrode block DEB includes detection electrode blocks DEBB (1, 1), DEBB (1, 2), DEBB (1, 3), DEBB (1, 4), DEBB (2, 1), DEBB ( 2, 2), DEBB (2, 3), DEBB (2, 4), DEBB (3, 1), DEBB (3, 2), DEBB (3, 3), DEBB (3, 4) .

  Also in the second embodiment, as shown in FIG. 13, the connection circuit 18 includes a multiplexer Mu and analog front ends SC1,..., SC48. The detection electrodes DE included in the detection electrode block DEBB (1, 1) are electrically connected to the analog front end SC 37, respectively. The detection electrodes DE included in the detection electrode block DEBB (1, 2) are electrically connected to the analog front end SC25. The detection electrodes DE included in the detection electrode block DEBB (1, 3) are electrically connected to the analog front end SC13. The detection electrodes DE included in the detection electrode block DEBB (1, 4) are electrically connected to the analog front end SC1.

  The detection electrodes DE included in the detection electrode block DEBB (2, 1) are electrically connected to the analog front end SC41. The detection electrodes DE included in the detection electrode block DEBB (2, 2) are electrically connected to the analog front end SC 29 respectively. The detection electrodes DE included in the detection electrode block DEBB (2, 3) are electrically connected to the analog front end SC17. The detection electrodes DE included in the detection electrode block DEBB (2, 4) are electrically connected to the analog front end SC5.

  The detection electrodes DE included in the detection electrode block DEBB (3, 1) are electrically connected to the analog front end SC 45, respectively. The detection electrodes DE included in the detection electrode block DEBB (3, 2) are electrically connected to the analog front end SC33. The detection electrodes DE included in the detection electrode block DEBB (3, 3) are electrically connected to the analog front end SC21. The detection electrodes DE included in the detection electrode block DEBB (3, 4) are electrically connected to the analog front end SC9.

  As shown in FIG. 23, in step ST11, the detection circuit 40 detects each detection electrode block DEBB (1, 1), DEBB (1) via 12 analog front ends SC out of 48 analog front ends SC. , 2), DEBB (1, 3), DEBB (1, 4), DEBB (2, 1), DEBB (2, 2), DEBB (2, 3), DEBB (2, 4), DEBB (3, 1) Self-capacitance is detected based on detection signals Vdet supplied from DEBB (3, 2), DEBB (3, 3), DEBB (3, 4). Thereby, the detection circuit 40 detects which detection electrode block DEBB is located among the plurality of detection electrode blocks DEBB.

  Next, the detection circuit 40 compares the strength of the supplied detection signal Vdet with the predetermined threshold ΔVtha to determine whether the strength of the detection signal Vdet is greater than or equal to the predetermined threshold ΔVtha (step ST12).

  When the signal strength of any one of the plurality of detection signals Vdet falls below the threshold value ΔVtha (Step ST12, No), the control circuit 11 returns the process to Step ST11. When the signal strength of any one detection signal Vdet among the plurality of detection signals Vdet is equal to or higher than the threshold ΔVtha (Yes in step ST12), the detection circuit is electrically bundled in 2 × 2 by the connection circuit 18, As shown in FIG. 23, a detection electrode block DEB having a size smaller than that of step ST11 is configured. Then, the control circuit 11 executes hover detection (step ST13).

  FIG. 25 is an explanatory view for explaining an analog front end to which each detection electrode block is connected when the detection electrodes are electrically bundled in 2 × 2 to constitute the detection electrode block. In FIG. 24, when 12 × 16 detection electrodes DE are electrically bundled in 2 × 2 to form a detection electrode block DEB, the detection electrode blocks DEB are arranged in a matrix of 6 × 8.

  The detection electrodes DE included in the detection electrode block DEB (1, 1) are electrically connected to the analog front end SC 39, respectively. The detection electrodes DE included in the detection electrode block DEB (1, 2) are electrically connected to the analog front end SC 37, respectively. Hereinafter, the same applies to the other detection electrode blocks DEB, and the detection electrodes DE included in each detection electrode block DEB are electrically connected to the analog front end SC of the reference numeral described in each detection electrode DE in FIG. There is.

  As shown in FIG. 25, in step ST13, the detection circuit 40 is based on the detection signal Vdet supplied from each detection electrode block DEB via 48 of the 48 analog front ends SC via the analog front end SC. To detect self-capacitance. Thus, the detection circuit 40 detects which detection electrode block DEBB is located among the plurality of detection electrode blocks DEB.

  Next, detection circuit 40 determines whether or not detection signal Vdet supplied from detection electrode block DEB shown in FIG. 25 is equal to or greater than predetermined threshold value ΔVthb (step ST14). If the detection signal Vdet supplied from the detection electrode block DEB shown in FIG. 25 falls below the predetermined threshold value ΔVthb (Yes in step ST14), the detection circuit 40 returns the process to step ST11. When the detection signal Vdet supplied from the detection electrode block DEB shown in FIG. 25 falls below a predetermined threshold value ΔVthb, it is considered that the distance between the detection subject CQ and the detection electrode DE is large. As the distance between the detection object CQ and the detection electrode DE increases, the control circuit 11 sends a control signal to the connection circuit 18 to increase the number of wires 51 electrically connected simultaneously to the analog front end SC. . By this processing, the detection sensitivity is improved, and the possibility of detecting the object CQ again increases.

  If the detection signal Vdet supplied from the detection electrode block DEB shown in FIG. 25 is equal to or higher than the predetermined threshold value ΔVthb (No in step ST14), the detection circuit 40 advances the process to step ST15.

  Next, detection circuit 40 determines whether or not detection signal Vdet supplied from detection electrode block DEB shown in FIG. 25 is equal to or greater than threshold value ΔVthc of a value larger than predetermined threshold value ΔVthb (step ST15). If the detection signal Vdet supplied from the detection electrode block DEB shown in FIG. 25 falls below the predetermined threshold value ΔVthc (No in step ST15), the detection circuit 40 returns the process to step ST13.

  Next, when the detection signal Vdet supplied from the detection electrode block DEB shown in FIG. 25 is equal to or higher than the threshold ΔVthc (Yes in step ST15), the control circuit 11 executes touch detection (step ST16). When the detection signal Vdet supplied from the detection electrode block DEB shown in FIG. 25 is equal to or higher than the threshold value ΔVthc (Yes in step ST15), it is considered that the distance between the detection subject CQ and the detection electrode DE is small. As the distance between the detection subject CQ and the detection electrode DE is smaller, the control circuit 11 sends a control signal to the connection circuit 18 to reduce the number of wires 51 simultaneously connected to the analog front end SC. .

  In step ST16, as in the first embodiment, the connection circuit 18 sequentially switches the detection electrodes DE to which the drive signal Vself for detection is supplied. In the second embodiment, as shown in FIG. 23, the detection electrodes DE included in one row are sequentially selected from step ST161 to step ST164 and connected to the analog front end SC, and the selection of the detection electrodes DE included in one row is performed. Shift one by one. In the present disclosure, selection of detection electrodes DE included in one row is sequentially shifted for each row, but selection of detection electrodes DE included in one column may be sequentially shifted for each column.

  FIGS. 26A to 26D are explanatory diagrams for describing a state in which the detection electrodes to which the drive signal for detection is supplied are sequentially switched. As shown in FIG. 26A, the connection circuit 18 selects the detection electrodes DE in the fourth, eighth, twelfth, and sixteenth rows, and the fourth, eighth, twelfth, twelfth, and sixteenth rows are selected. The connection circuit 18 connects each of the detection electrodes DE of and the analog front end SC of the reference numeral described in each of the detection electrodes DE of FIG. 26A (see FIG. 23, step ST161).

  As shown in FIG. 26B, the connection circuit 18 selects the detection electrodes DE in the third, seventh, eleventh, fifteenth rows, and the third, seventh, eleventh, fifteenth rows The connection circuit 18 connects each of the detection electrodes DE of and the analog front end SC of the reference numeral described in each of the detection electrodes DE of FIG. 26B (see FIG. 23, step ST162).

  As shown in FIG. 26C, the connection circuit 18 selects the detection electrodes DE in the second, sixth, tenth, and fourteenth rows, and the second, sixth, tenth, tenth, and fourteenth rows. The connection circuit 18 connects each of the detection electrodes DE of and the analog front end SC of the reference numeral described in each of the detection electrodes DE of FIG. 26C (see FIG. 23, step ST163).

  As shown in FIG. 26D, the connection circuit 18 selects the detection electrodes DE on the first, fifth, ninth, and thirteenth rows, and the first, fifth, ninth, and thirteenth rows are selected. The connection circuit 18 connects each of the detection electrodes DE of and the analog front end SC of the reference numeral described in each of the detection electrodes DE of FIG. 26D (see FIG. 23, step ST164).

  In FIG. 26A to FIG. 26D, the analog front end SC is not connected to the detection electrode DE in which the analog front end SC is not described.

  As described above, by sequentially shifting the selection of the detection electrodes DE included in one row, the detection circuit 40 detects the detection signals of all the detection electrodes DE even in the analog front end SC smaller than the number of all the detection electrodes DE. The signal strength of Vdet can be obtained.

  Next, detection circuit 40 determines whether or not detection signal Vdet supplied from detection electrode block DEB shown in FIGS. 26A to 26D is equal to or greater than predetermined threshold value ΔVthd (step ST17). If the detection signal Vdet supplied from the detection electrode block DEB shown in FIGS. 26A to 26D falls below the predetermined threshold value ΔVthd (Yes in step ST17), the detection circuit 40 returns the process to step ST13. By this processing, the detection sensitivity is improved, and the possibility of detecting the object CQ again increases.

  If the detection signal Vdet supplied from the detection electrode block DEB shown in FIG. 26A to FIG. 26D is equal to or greater than the predetermined threshold value ΔVthd (No in step ST17), the detection circuit 40 detects the object CQ. Extract the coordinates and then finish the process.

(Embodiment 3)
FIG. 27 is a flowchart illustrating an operation example of the display device according to the third embodiment. FIG. 28 is a schematic explanatory view for explaining a change in the state of the detection electrode connected to the analog front end. In addition, about the component demonstrated in Embodiment 1 and Embodiment 2, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  Also in FIG. 27, the display period Pd and the detection period Pt described above are alternately performed in time division. The display period Pd is the same as in the first embodiment, and thus the detailed description is omitted. In the detection period Pt of the third embodiment, the detection circuit is electrically bundled in 4 × 4 by the connection circuit 18 to form a detection electrode block DEB, and the control circuit 11 executes hover detection (step ST21). Since the process of step S21 is the same as the process of step S11 described above, the detailed description will be omitted.

  Next, the detection circuit 40 obtains the strength of the supplied detection signal Vdet, compares the strength of the detection signal Vdet with a predetermined threshold value ΔVtha, and determines whether or not it is a predetermined threshold value ΔVtha or more (step ST22) .

  If the signal strength of any one detection signal Vdet among the plurality of detection signals Vdet falls below the threshold ΔVtha (step ST22, No), the control circuit 11 returns the process to step ST1. When the signal strength of any one detection signal Vdet among the plurality of detection signals Vdet is equal to or higher than the threshold ΔVtha (Yes in step ST22), the detection circuit is electrically bundled in 2 × 2 by the connection circuit 18, As shown in FIG. 28, a detection electrode block DEB of a size smaller than that of step ST21 is configured. Then, the control circuit 11 performs hover detection (step ST23).

  Next, detection circuit 40 determines whether or not detection signal Vdet supplied from detection electrode block DEB shown in FIG. 27 is equal to or greater than predetermined threshold value ΔVthb (step ST24). If the detection signal Vdet supplied from the detection electrode block DEB shown in FIG. 27 falls below the predetermined threshold value ΔVthb (Yes in step ST24), the detection circuit 40 returns the process to step ST21. By this processing, the detection sensitivity is improved, and the possibility of detecting the object CQ again increases.

  If the detection signal Vdet supplied from the detection electrode block DEB shown in FIG. 25 is equal to or higher than the predetermined threshold value ΔVthb (No in step ST24), the detection circuit 40 advances the process to step ST25.

  Next, when the detection signal Vdet supplied from the detection electrode block DEB shown in FIG. 27 is equal to or higher than the threshold ΔVthb (No in step ST24), the control circuit 11 executes touch detection (step ST 25).

  In the third embodiment, as shown in FIG. 28, in step ST22, touch detection is performed on the detection electrode block DEB which is determined to be equal to or higher than the predetermined threshold value ΔVthb and the detection electrode DE around the detection electrode block DEB. Run.

  As described above, in the hover detection, the control circuit 11 processes the touch detection on the detection electrode block DEB that is equal to or greater than the predetermined threshold value ΔVthb and the area around the detection electrode block DEB. The DE is determined, and the control circuit 11 processes touch detection on the determined detection electrode DE and the detection electrode DE adjacent to the detection electrode DE.

  By this, it is not necessary to detect the capacitances of all the detection electrodes DE, and the detection period Pt can be shortened, or the number of detections in the detection period Pt can be increased with respect to the same detection electrode DE to be detected. , Detection accuracy can be improved.

  FIG. 29 is a flowchart illustrating an operation example of a display device according to a modification of the third embodiment. FIG. 30 is a schematic explanatory view for explaining changes in the state of detection electrodes connected to the analog front end in the modification of the third embodiment. In addition, about the component demonstrated in Embodiment 3, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The modification of the third embodiment differs from the third embodiment in that a plurality of objects to be detected are provided. The processing from step ST21 to step ST24 in FIG. 29 is the same as the processing in the third embodiment, but as shown in FIG. 30, the detection subject CQ1 and the detection subject CQ2 are in the existing state.

  In the modification of the third embodiment, as shown in FIG. 30, the number of detection electrode blocks DEB determined to be equal to or larger than the predetermined threshold value ΔVthb in step ST24 and the number of detection electrodes DE around the detection electrode blocks DEB are When the number of analog front ends SC included in the connection circuit 18 is exceeded, touch detection is performed on two areas.

  First, as shown in FIG. 30, a touch detection is performed on a detection electrode block DEB which is estimated to be equal to or greater than a predetermined threshold ΔVthb, which is estimated to be affected by the detection object CQ1, and a region around the detection electrode block DEB Run.

  FIG. 31 is an explanatory diagram of an example of an area where touch detection is performed. As shown in FIG. 31, the detection electrode block determined to have the predetermined threshold value ΔVthb or more is the detection electrode block DEB (3, 7), DEB (3, 8), DEB (4, 7), DEB (4, 5). 8). The connection circuit 18 has analog front ends SC41, SC42 with respect to the detection electrodes DE included in the detection electrode blocks DEB (3, 7), DEB (3, 8), DEB (4, 7), DEB (4, 8). , SC43, SC44, SC29, SC30, SC31, SC32, SC17, SC18, SC19, SC20, SC5, SC6, SC7, SC8. Since the detection accuracy of coordinate extraction is lower when detecting the detection target CQ1 with the detection electrode block DEB than with the detection electrode DE, the detection electrode blocks DEB (3, 7), DEB (3, 8), DEB (4) , 7) and the detection electrodes DE around DEB (4, 8) are preferably touch-detected.

  The connection circuit 18 compares the detection electrodes DE shown in FIG. 31 with the detection electrodes DE surrounded by the detection electrodes DE (1, 13), DE (1, 16), DE (12, 13), and DE (12, 16). Each is electrically connected to the analog front end SC of the code described in the above.

  Next, as shown in FIG. 30, in the area different from step ST25, touch detection is performed on the detection electrode block DEB determined to be equal to or more than the predetermined threshold value ΔVthb and the area around the detection electrode block DEB. Execute (step ST26).

(Embodiment 4)
FIG. 32 is a schematic explanatory view for explaining changes in the state of detection electrodes connected to the analog front end of the fourth embodiment. FIG. 33 is an explanatory diagram for explaining the connection circuit of the fourth embodiment. FIG. 34 is a schematic explanatory view for explaining a change in the connection circuit of the fourth embodiment in the 2 × 2 bundle hover detection. FIG. 35 is a schematic explanatory view for explaining a change in the state of the connection circuit of the fourth embodiment in the first state in which the detection electrodes are sequentially switched. In addition, about the component demonstrated in Embodiment 1-Embodiment 3, the same code | symbol is attached | subjected and description is abbreviate | omitted. The detection electrodes DE (1, n) to the detection electrodes DE (1, n-15) and the detection electrodes DE (2, n) to the detection electrodes DE (2, n-15) shown in FIGS. A part of the detection electrode DE shown in FIG. 13 is illustrated, and a specific shape is a rectangle as shown in FIG.

  The connection circuit 18 shown in FIG. 33 switches between the step of hover detection (step ST32) and the step of touch detection (step ST33 or step ST34) as shown in FIG.

  The connection circuit 18 shown in FIG. 33 includes switches Mux1, Mux2 and Mux3. The connection circuit 18 shown in FIG. 33 includes relay wirings DEL (1, n) connected to the detection electrodes DE (1, n) via the switch Mux1. Similarly, from detection electrode DE (1, n-1) to detection electrode DE (1, n-15), from relay wiring DEL (1, n-1) to relay wiring DEL (1, n-15) , Connected via switch Mux1. The detection electrode DE (2, n) to the detection electrode DE (2, n-15) are connected from the relay wiring DEL (2, n) to each of the relay wiring DEL (2, n-15) through the switch Mux 1 It is done. When only one of relay wiring DEL (1, n) to relay wiring DEL (1, n-15) and relay wiring DEL (2, n) to relay wiring DEL (2, n-15) is simply described , Relay wiring DEL will be described.

  The switch Mux1 connects each detection electrode DE to the supply wiring of the display drive signal VCOM, the supply wiring of the guard signal Vgd, or the relay wiring DEL connected to the analog front end SC. The relay wiring DEL connects the switch Mux1 and the switch Mux2 and connects the switch Mux1 and the switch Mux3. The switches Mux1, Mux2 and Mux3 are respectively opened and closed, and any one of the supply wiring of the display drive signal VCOM, the supply wiring of the guard signal Vgd and the analog front end SC is connected to one detection electrode DE by time division. Ru.

  In step ST32 shown in FIG. 32, the switch Mux2 disconnects the relay wiring DEL and the analog front end SC. As shown in FIG. 34, the switch Mux 3 and the relay wiring DEL electrically connect the detection electrodes DE adjacent to each other in the first direction Dx and the second direction Dy to bundle 2 × 2 detection electrodes DE. The detection electrode block DEB (1, N) is changed to the detection electrode block DEB (1, N-7). The detection electrode blocks DEB (1, N) to the detection electrode blocks DEB (1, N-7) are connected from the analog front end SC1 to the analog front end SC7, respectively. Then, the control circuit 11 shown in FIG. 1 executes hover detection (step ST32).

  If the detection signal Vdet supplied from each detection electrode block DEB shown in FIG. 34 is equal to or greater than the predetermined threshold value ΔVthb, the detection circuit 40 proceeds with the process to step ST33.

  In the fourth embodiment, in step ST33, touch detection is performed on the detection electrode block DEB which is determined to be equal to or greater than the predetermined threshold value ΔVthb and the detection electrode DE around the detection electrode block DEB.

  For example, in step ST33, there is a detection electrode block DEB (1, N) determined to be equal to or more than a predetermined threshold value ΔVthb, and detection electrode DE (1, n) corresponding to the detection electrode block DEB (1, N) As shown in FIG. 35, touch detection is performed on the electrode DE (1, n-1), the detection electrode DE (2, n), and the detection electrode DE (2, n-1) (step ST33).

  The switch Mux3 disconnects the relay wiring DEL from the analog front end SC. The switch Mux1 is connected to the detection electrodes DE (1, n), DE (1, n-1), DE (1, n-2) and DE (1, n-3) as relay interconnections DEL (1, n), It electrically connects to DEL (1, n-1), DEL (1, n-2), and DEL (1, n-3), respectively. The switch Mux1 connects the other detection electrode DE to the supply line of the guard signal Vgd.

  The switch Mux2 connects the analog front end SC1 and the relay wiring DEL (1, n) and connects the analog front end SC5 and the relay wiring DEL (2, n). Next, the switch Mux2 connects between the analog front end SC1 and the relay wiring DEL (1, n-1), and between the analog front end SC5 and the relay wiring DEL (2, n-1) Connecting. Next, the switch Mux2 connects between the analog front end SC1 and the relay wiring DEL (1, n-2), and between the analog front end SC5 and the relay wiring DEL (2, n-2) Connecting. The switch Mux2 connects between the analog front end SC1 and the relay wiring DEL (1, n-3), and connects between the analog front end SC5 and the relay wiring DEL (2, n-3) Do. By this processing, the detection electrodes DE adjacent in the first direction Dx are simultaneously selected, and each is connected to the analog front end SC. Along with the operation of the switch Mux2, the detection electrodes DE connected to the analog front end SC are sequentially switched in the second direction Dy.

  Next, after the process of step ST33 shown in FIG. 32, another detection electrode block DEB which is determined to be equal to or more than the predetermined threshold ΔVthb in the process of step S32 and the detection electrodes DE around the detection electrode block DEB are targeted. , Touch detection is performed (step ST34). The process of step ST34 is the same as that of step ST33, except that the position in the second direction Dy of the detection electrode DE connected to the analog front end SC is different, and thus the detailed description is omitted.

Embodiment 5
FIG. 36 is a schematic explanatory view for explaining a change in the state of the detection electrode connected to the analog front end of the fifth embodiment. FIG. 37 is an explanatory diagram for explaining a connection circuit of the fifth embodiment. FIG. 38 is a schematic explanatory diagram for describing changes in the state of the connection circuit of the fifth embodiment in the second state in which the detection electrodes are sequentially switched. FIG. 39 is a schematic explanatory view for explaining changes in the connection circuit of the fifth embodiment in the 2 × 2 bundle hover detection. FIG. 40 is a schematic explanatory view for explaining changes in the connection circuit of the fifth embodiment in the first state in which the detection electrodes are sequentially switched. In addition, about the component demonstrated by Embodiment 1-Embodiment 4, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The connection circuit 18 shown in FIG. 37 switches between the touch detection step (step ST31) and the hover detection step (step ST32) as shown in FIG. Further, as in the fourth embodiment, the step of hover detection (step ST32) and the step of touch detection (step ST33 or step ST34) are switched.

  The connection circuit 18 shown in FIG. 37 includes switches Mux1, Mux2, Mux3 and Mux4. The relay wiring DEL connects the switch Mux1 to the switch Mux2, connects the switch Mux1 to the switch Mux3, and connects the switch Mux1 to the switch Mux3. By switching the switches Mux1, Mux2, Mux3 and Mux4, respectively, any of the drive signal VCOM supply wiring for display, the guard signal Vgd supply wiring, and the analog front end SC can be time-divided into one detection electrode DE. Connected

  In step ST31 shown in FIG. 36, as shown in FIG. 38, the switches Mux2 and Mux3 disconnect the relay wiring DEL from the analog front end SC. The switch Mux1 includes the detection electrodes DE (1, n), DE (1, n-4), DE (1, n-8), and DE (1, n-12) as relay interconnections DEL (1, n), Electrically connect to DEL (1, n-4), DEL (1, n-8) and DEL (1, n-12) respectively. The switch Mux1 connects the other detection electrode DE to the supply line of the guard signal Vgd.

  Then, the switch Mux4 electrically connects the analog front end SC1 and the relay wiring DEL (1, n). Similarly, the analog front end SC2 electrically connects to the relay wiring DEL (1, n-4). The analog front end SC3 is electrically connected to the relay wiring DEL (1, n-8). The analog front end SC4 electrically connects to the relay wiring DEL (1, n-12). The analog front end SC5 is electrically connected to the relay wiring DEL (2, n). The analog front end SC6 electrically connects to the relay wiring DEL (2, n-4). The analog front end SC7 electrically connects to the relay wiring DEL (2, n-8). The analog front end SC8 electrically connects to the relay wiring DEL (2, n-12). Thereby, as shown in FIG. 26A described above, the connection circuit 18 selects the detection electrodes DE in the fourth, eighth, twelfth, and sixteenth rows, and the fourth, eighth, and twelfth rows are selected. The connection circuit 18 connects the detection electrodes DE in the sixteenth row and the sixteenth row with the analog front end SC of the reference numeral described in each detection electrode DE in FIG. 26A.

  When the relay wiring DEL electrically connected by the switch Mux4 is sequentially switched, as shown in FIG. 26B, the connection circuit 18 selects the detection electrodes DE in the third, seventh, eleventh, and fifteenth rows. . As a result, the detection electrodes DE in the third, seventh, eleventh, and fifteenth rows shown in FIG. 26B and the analog front end SC with the reference numeral described in each detection electrode DE in FIG. 26B are connected. Ru.

  Furthermore, when the relay wiring DEL electrically connected by the switch Mux4 is sequentially switched, as shown in FIG. 26C, the connection circuit 18 detects the detection electrodes DE in the second, sixth, tenth, and fourteenth rows. select. As a result, the detection electrodes DE in the second, sixth, tenth, and fourteenth rows shown in FIG. 26C and the analog front end SC with the reference numeral described in each detection electrode DE in FIG. 26C are connected. Ru.

  Furthermore, when the relay wiring DEL electrically connected by the switch Mux4 is sequentially switched, as shown in FIG. 26D, the connection circuit 18 detects the detection electrodes DE in the first, fifth, ninth, and thirteenth rows. select. As a result, the detection electrodes DE in the first, fifth, ninth, and thirteenth rows shown in FIG. 26D and the analog front end SC with the reference numeral described in each detection electrode DE in FIG. 26D are connected. Ru.

  As shown in FIG. 36, FIG. 26A, FIG. 26B, FIG. 26C and FIG. 26D, in step ST31, the detection device of the fifth embodiment has more detection electrodes DE than the number of analog front ends SC. Also, touch detection on the entire surface can be processed sequentially.

  In step ST32 shown in FIG. 36, the switches Mux2 and Mux4 disconnect the relay wiring DEL from the analog front end SC. As shown in FIG. 39, the switch Mux 3 and the relay wiring DEL electrically connect the detection electrodes DE adjacent to each other in the first direction Dx and the second direction Dy to bundle 2 × 2 detection electrodes DE. The detection electrode block DEB (1, N) is changed to the detection electrode block DEB (1, N-7). The detection electrode blocks DEB (1, N) to the detection electrode blocks DEB (1, N-7) are connected from the analog front end SC1 to the analog front end SC7, respectively. Then, the control circuit 11 shown in FIG. 1 executes hover detection (step ST32).

  If the detection signal Vdet supplied from each detection electrode block DEB shown in FIG. 39 is equal to or greater than the predetermined threshold value ΔVthb, the detection circuit 40 proceeds with the process to step ST33.

  In the fifth embodiment, in step ST33, touch detection is performed on the detection electrode block DEB which is determined to be equal to or greater than the predetermined threshold value ΔVthb and the detection electrode DE around the detection electrode block DEB.

  For example, in step ST33, there is a detection electrode block DEB (1, N) determined to be equal to or more than a predetermined threshold value ΔVthb, and detection electrode DE (1, n) corresponding to the detection electrode block DEB (1, N) As shown in FIG. 40, touch detection is performed on the electrode DE (1, n-1), the detection electrode DE (2, n), and the detection electrode DE (2, n-1) (step ST33).

  Switches Mux3 and Mux4 disconnect the relay wiring DEL from the analog front end SC. The switch Mux3 connects between the analog front end SC1 and the relay wiring DEL (1, n), and connects between the analog front end SC5 and the relay wiring DEL (2, n). Next, the switch Mux2 connects between the analog front end SC1 and the relay wiring DEL (1, n-1), and between the analog front end SC5 and the relay wiring DEL (2, n-1) Connecting. Next, the switch Mux2 connects between the analog front end SC1 and the relay wiring DEL (1, n-2), and between the analog front end SC5 and the relay wiring DEL (2, n-2) Connecting. The switch Mux2 connects between the analog front end SC1 and the relay wiring DEL (1, n-3), and connects between the analog front end SC5 and the relay wiring DEL (2, n-3) Do. By this processing, the detection electrodes DE adjacent in the first direction Dx are simultaneously selected and connected to the analog front end SC. Along with the operation of the switch Mux2, the detection electrodes DE connected to the analog front end SC are sequentially switched in the second direction Dy.

  Next, after the process of step ST33 shown in FIG. 32, another detection electrode block DEB which is determined to be equal to or more than the predetermined threshold ΔVthb in the process of step S32 and the detection electrodes DE around the detection electrode block DEB are targeted. , Touch detection is performed (step ST34). The process of step ST34 is the same as that of step ST33, except that the position in the second direction Dy of the detection electrode DE connected to the analog front end SC is different, and thus the detailed description is omitted.

Embodiment 6
FIG. 41 is a plan view schematically showing the relationship between the detection electrode and the connection circuit according to the sixth embodiment. In addition, about the component demonstrated in Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The connection circuit 18 of the sixth embodiment incorporates the multiplexer Mu, but does not incorporate the analog front end SC. The analog front end SC is incorporated in the integrated circuit 19. Since the analog front end SC is formed separately from the multiplexer Mu, the number of circuits such as TFTs included in the connection circuit 18 on the first substrate 21 can be reduced, and the area of the connection circuit 18 can be reduced. As a result, the peripheral region 10b can be effectively used as a space for forming another element, or the peripheral region 10b can be made smaller to make a narrow frame.

  The preferred embodiments have been described above, but the present disclosure is not limited to such embodiments. The content disclosed in the embodiment is merely an example, and various modifications can be made without departing from the scope of the present disclosure. Appropriate changes made without departing from the spirit of the present disclosure naturally fall within the technical scope of the present disclosure.

  For example, the shapes, the arrangement, the number, and the like of the detection electrodes DE, the pixel electrodes 22 and the like are merely examples, and can be appropriately changed.

For example, the display device of this aspect can take the following aspects.
(1) substrate,
A plurality of detection electrodes arranged in a matrix in a second direction crossing a first direction and the first direction in a sensor area of the substrate;
A drive circuit for supplying a drive signal to the detection electrode;
A plurality of wires electrically connected to each of the plurality of detection electrodes;
An analog front end that receives, from the detection electrode, a detection signal corresponding to a change in capacitance of the detection electrode when the drive signal is supplied;
And a multiplexer connected to one of the detection electrodes via one of the wires and capable of changing the number of wires electrically connected simultaneously to one of the analog front ends.
Each of the plurality of wires extends along the second direction,
The plurality of wires are arranged side by side along the first direction,
Detection device.
(2) A control circuit for controlling the multiplexer is provided, and the control circuit is electrically connected in accordance with the distance between the object to be detected and the detection electrode in a third direction crossing the first direction and the second direction. The detection device according to (1), wherein the number of the detection electrodes connected simultaneously is changed.
(3) The detection device according to (1), wherein the multiplexer is disposed on the same substrate as the substrate on which the detection electrode is located, and is outside the sensor area.
(4) The detection device according to (3), wherein the analog front end is built in an integrated circuit and formed separately from the multiplexer.
(5) The detection device according to any one of (1) to (4), wherein the analog front end is disposed on the same substrate as the detection electrode and is outside the sensor area.
(6) The detection device according to any one of (1) to (5), wherein the number of detection electrodes is larger than the number of analog front ends.
(7) The plurality of detection electrodes electrically connected to the wiring that can be simultaneously connected to one of the analog front ends includes the two detection electrodes adjacent in the first direction or the second direction (1 ) The detection device according to any one of (6) to (6).
(8) The detection device according to any one of (1) to (7), wherein the multiplexer electrically connects the wires one by one in a time division manner to one of the analog front ends.
(9) A first detection mode in which the number of wires electrically connected simultaneously to one analog front end is one, and the same electrically connected simultaneously to one analog front end The detection device according to any one of (1) to (8), including a control circuit that controls the multiplexer in any one of a plurality of second detection modes in which the number of wires is plural.
(10) The control circuit causes the control signal to increase the number of the wires electrically connected simultaneously with respect to one analog front end as the distance between the detection target and the detection electrode increases. The detection device according to 9).
(11) A detection circuit for processing the detection signal via the analog front end;
When the detection signal detected by the detection circuit is larger than the first threshold, the control circuit changes the number of wires electrically connected simultaneously to one analog front end to be smaller ( The detection device according to 9).
(12) A detection circuit for processing the detection signal through the analog front end
When the detection signal detected by the detection circuit falls below a second threshold smaller than the first threshold, the number of wires electrically connected simultaneously to one analog front end is changed to be larger. The detection apparatus as described in (11).
(13)
In the second detection mode, a detection electrode to process the first detection mode is determined, and the first detection mode is processed for the detection electrode and a detection electrode adjacent to the detection electrode (9). Detection device.
(14) In the first detection mode, the plurality of detection electrodes adjacent in the first direction are connected to the plurality of analog front ends, respectively, according to any one of (9) to (13). Detection device.
(15) A display panel including the detection device according to any one of (1) to (14) and a display area, and the detection electrode is provided in an area overlapping with the display area. , Display device.
(16) The display device according to (15), wherein a display period and a detection period are alternately performed in a time division manner, and a common potential is supplied to all the detection electrodes in the display period.

DESCRIPTION OF SYMBOLS 1 display device 6 liquid crystal layer 10 display panel 10a display area 10b peripheral area 11 control circuit 14 drive circuit 18 connection circuit 19 integrated circuit 20 display area 21 first substrate 22 pixel electrode 30 sensor area 31 second substrate 40 detection circuit 51 wiring DEB Detection electrode block DE Detection electrode SC Analog front end Mu multiplexer

Claims (16)

A substrate,
A plurality of detection electrodes arranged in a matrix in a second direction crossing a first direction and the first direction in a sensor area of the substrate;
A drive circuit for supplying a drive signal to the detection electrode;
A plurality of wires electrically connected to each of the plurality of detection electrodes;
An analog front end that receives, from the detection electrode, a detection signal corresponding to a change in capacitance of the detection electrode when the drive signal is supplied;
And a multiplexer connected to one of the detection electrodes via one of the wires and capable of changing the number of wires electrically connected simultaneously to one of the analog front ends.
Each of the plurality of wires extends along the second direction,
The plurality of wires are arranged side by side along the first direction,
Detection device.   The control circuit includes a control circuit that controls the multiplexer, and the control circuit electrically simultaneously operates according to the distance between the detection target and the detection electrode in a third direction crossing the first direction and the second direction. The detection device according to claim 1, wherein the number of detection electrodes connected is changed.   The detection apparatus according to claim 1, wherein the multiplexer is disposed on the same substrate as the substrate on which the detection electrode is located, and is outside the sensor area.   The detection device according to claim 3, wherein the analog front end is built in an integrated circuit and formed separately from the multiplexer.   The detection apparatus according to any one of claims 1 to 4, wherein the analog front end is disposed on the same substrate as the detection electrode and is outside the sensor area.   The detection device according to any one of claims 1 to 5, wherein the number of detection electrodes is larger than the number of the analog front ends.   The plurality of detection electrodes electrically connected to the wiring that can be simultaneously connected to one of the analog front ends includes at least two of the detection electrodes adjacent in the first direction or the second direction. The detection apparatus of any one of Claim 6.   The detection apparatus according to any one of claims 1 to 7, wherein the multiplexer electrically connects the wirings one by one in a time-division manner to one of the analog front ends.   The first detection mode in which the number of wires electrically connected simultaneously to one analog front end is one, and the number of wires electrically connected simultaneously to one analog front end The detection device according to any one of claims 1 to 8, further comprising: a control circuit that controls the multiplexer in any one of a plurality of second detection modes in which   The control circuit increases the number of wires electrically connected simultaneously to one of the analog front end by a control signal as the distance between the detection target and the detection electrode increases. Detection device as described. Detection circuitry for processing the detection signal via the analog front end;
When the detection signal detected by the detection circuit is larger than a first threshold, the control circuit changes the number of wires electrically connected simultaneously to one analog front end to be smaller. Item 10. The detection device according to item 9. Detection circuitry for processing the detection signal via the analog front end;
When the detection signal detected by the detection circuit falls below a second threshold smaller than the first threshold, the number of wires electrically connected simultaneously to one analog front end is changed to be larger. The detection device according to claim 11.   The detection electrode to process the first detection mode is determined in the second detection mode, and the first detection mode is processed for the detection electrode and a detection electrode adjacent to the detection electrode. Detection device.   The detection device according to any one of claims 9 to 13, wherein in the first detection mode, the plurality of detection electrodes adjacent in the first direction are connected to the plurality of analog front ends, respectively. A display apparatus comprising: the detection device according to any one of claims 1 to 14; and a display panel including a display area, wherein the detection electrode is provided in an area overlapping with the display area. .   The display device according to claim 15, wherein a display period and a detection period are alternately performed in a time division manner, and a common potential is supplied to all the detection electrodes in the display period.