JP2017188106A - Detection device, display device, and detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detection device, a display device, and a detection method which can obtain the excellent detection sensitivity by suppressing the capacitive coupling between electrodes.SOLUTION: A detection device includes: a detection electrode group including a plurality of first electrodes for detecting detection signals that change by the contact or approximation of an external object; an output line; and a selective connection unit which connects between the output signal line and the first electrode of a first detection target among the detection electrode group in accordance with a first selection signal, outputs to the output signal line a first output signal obtained by integrating detection signals from the first electrode of the selected first detection target, connects between the output signal line and the first electrode of a second detection target that is not included in the first detection target among the detection electrode group in accordance with a second selection signal that is different from the first selection signal, and outputs to the output signal line a second output signal obtained by integrating detection signals from the first electrode of the selected second detection target.SELECTED DRAWING: Figure 12

Description

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

  In recent years, a so-called touch panel called a detection device capable of detecting an external proximity object 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. In such a detection apparatus, a plurality of drive electrodes are simultaneously selected, and a drive signal whose phase is determined based on a predetermined code is supplied to each of the selected plurality of drive electrodes to thereby provide an external proximity object. A code division selection drive for detecting the above is known (see Patent Document 1).

JP 2014-199605 A

  However, unlike the case of the mutual capacitance method, in the case of the self-capacitance method that detects an external proximity object based on the capacitance of the detection electrodes, drive signals of different phases are applied to the plurality of detection electrodes. When supplied, the capacitive coupling between the detection electrodes increases, and the detection sensitivity may decrease.

  An object of the present invention is to provide a detection device, a display device, and a detection method capable of suppressing capacitive coupling between electrodes and obtaining good detection sensitivity.

  According to one embodiment of the present invention, a detection device includes a detection electrode group including a plurality of first electrodes for detecting a detection signal that changes due to contact or proximity of an external object, an output signal line, and a first selection signal. A first output signal obtained by connecting the first electrode of the first detection target of the detection electrode group and the output signal line and integrating the detection signals from the selected first electrode of the first detection target. In response to a second selection signal that is output to the output signal line and is different from the first selection signal, the first electrode of the second detection target that is not included in the first detection target in the detection electrode group and the output And a selection connection unit that connects the signal line and outputs a second output signal in which the detection signals from the selected first electrodes of the second detection target are integrated to the output signal line.

  A display device according to one embodiment of the present invention includes a display function layer that displays an image, a detection electrode group including a plurality of first electrodes for detecting a detection signal that changes due to contact or proximity of an external object, and an output signal A detection signal from the first electrode of the first detection target selected by connecting the first electrode of the first detection target of the detection electrode group and the output signal line in accordance with the first selection signal and the line Is output to the output signal line, and a second selection signal different from the first selection signal is not included in the first detection target in the detection electrode group in response to a second selection signal. A selection connecting unit that connects the first electrode to be detected and the output signal line, and outputs a second output signal in which the detection signals from the selected first electrode to be detected are integrated to the output signal line. And having.

  The detection method of one embodiment of the present invention includes a detection electrode group including a plurality of first electrodes for detecting a detection signal that changes due to contact or proximity of an external object, an output signal line, the first electrode, A detection method of a detection device having a selection connection section for switching between connection and disconnection with an output signal line, wherein the selection connection section is a first detection target in the detection electrode group according to a first selection signal. Connecting the first electrode of the first and the output signal line, and outputting to the output signal line a first output signal in which the detection signals from the selected first electrodes of the first detection target are integrated; In response to a second selection signal different from the one selection signal, the first electrode of the second detection target not included in the first detection target in the detection electrode group and the output signal line are connected and selected. Integrated detection signal from the first electrode of the second detection target An output signal and outputting the output signal line.

FIG. 1 is a block diagram illustrating a configuration example of the display device according to the first embodiment. FIG. 2 is a block diagram illustrating a configuration example of the signal processing unit. FIG. 3 is an explanatory view for explaining the basic principle of self-capacitance type touch detection. FIG. 4 is a diagram illustrating an example of a detection drive signal and a waveform of the detection signal in the self-capacitance type touch detection. FIG. 5 is a diagram illustrating an example of a module in which a display device is mounted. FIG. 6 is a cross-sectional view illustrating a schematic cross-sectional structure of the display unit with a detection function. FIG. 7 is a circuit diagram illustrating a pixel arrangement of the display unit with a detection function according to the first embodiment. FIG. 8 is a circuit diagram illustrating an arrangement of the first electrodes of the detection unit according to the first embodiment. FIG. 9 is a schematic diagram illustrating an example of the detection operation. FIG. 10 is a schematic diagram illustrating an example of the arrangement of the display period and the detection period. FIG. 11 is a block diagram illustrating a configuration example of the drive circuit according to the first embodiment. FIG. 12 is an explanatory diagram for explaining a selection pattern of the first electrode selected as a detection target. FIG. 13 is an explanatory diagram illustrating an operation example of the multiplexer and the gate driver according to the first embodiment. FIG. 14 is an explanatory diagram illustrating an operation example of the multiplexer and the gate driver when the second electrode block to be selected is changed. FIG. 15 is a block diagram illustrating a configuration example of the signal processing unit according to the second embodiment. FIG. 16 is a circuit diagram illustrating a configuration example of the selective connection unit according to the second embodiment. FIG. 17 is an explanatory diagram illustrating an operation example of the selective connection unit and the gate driver according to the second embodiment. FIG. 18 is a circuit diagram illustrating another example of the selective connection unit. FIG. 19 is an explanatory diagram for explaining another example of the selection pattern of the first electrode selected as the detection target according to the third embodiment. FIG. 20 is an explanatory diagram for explaining an example of a selection pattern of the first electrode selected as a detection target in the first detection operation and the second detection operation according to the fourth embodiment. FIG. 21 is an explanatory diagram for describing an example of a selection pattern of the first electrode selected as a detection target in the third detection operation and the fourth detection operation. FIG. 22 is an explanatory diagram for explaining an example of a selection pattern of the first electrode selected as a detection target in the fifth detection operation and the sixth detection operation. FIG. 23 is an explanatory diagram for explaining an example of a selection pattern of the first electrode selected as a detection target in the seventh detection operation and the eighth detection operation. FIG. 24 is an explanatory diagram for describing an example of a selection pattern of the first electrode selected as a detection target in the ninth detection operation and the tenth detection operation. FIG. 25 is an explanatory diagram for explaining an example of a selection pattern of the first electrode selected as a detection target in the eleventh detection operation and the twelfth detection operation. FIG. 26 is an explanatory diagram for describing an example of a selection pattern of the first electrode selected as a detection target in the thirteenth detection operation and the fourteenth detection operation. FIG. 27 is an explanatory diagram for explaining an example of a selection pattern of the first electrode selected as a detection target in the fifteenth detection operation and the sixteenth detection operation. FIG. 28 is a block diagram of the first electrode and each drive circuit according to the fifth embodiment. FIG. 29 is a cross-sectional view illustrating a schematic cross-sectional structure of a display device according to the sixth embodiment. FIG. 30 is a schematic diagram for explaining the order of detection of the first electrodes. FIG. 31 is a graph schematically showing the relationship between the sensor number and the correlation function.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following embodiments. The constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the constituent elements described below can be appropriately combined. It should be noted that the disclosure is merely an example, and those skilled in the art can easily conceive of appropriate modifications while maintaining the gist of the invention are naturally included in the scope of the present invention. In addition, the drawings may be schematically represented with respect to the width, thickness, shape, and the like of each part in comparison with actual aspects for the sake of clarity of explanation, but are merely examples, and the interpretation of the present invention is not limited. It is not limited. In addition, in the present specification and each drawing, elements similar to those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description may be omitted as appropriate.

(First embodiment)
FIG. 1 is a block diagram illustrating a configuration example of the display device according to the first embodiment. As shown in FIG. 1, the display device 1 includes a display unit 10 with a detection function, a control unit 11, a display gate driver 12A, a detection gate driver 12B, a source driver 13, and a first electrode driver 14. The signal processing unit 40 is provided. The display device 1 is a display device in which the display unit 10 with a detection function incorporates a detection function. The display unit with a detection function 10 is a device in which a display panel 20 that uses a liquid crystal display element as a display element and a detection unit 30 that is a detection device that detects a touch input are integrated. The device in which the display panel 20 and the detection unit 30 are integrated indicates, for example, that a part of a substrate or an electrode used for the display panel 20 or the detection unit 30 is also used. The display unit 10 with a detection function may be a so-called on-cell type device in which the detection unit 30 is mounted on the display panel 20. The display panel 20 may be an organic EL display panel, for example.

  As will be described later, the display panel 20 is a display device that performs display by sequentially scanning one horizontal line at a time in accordance with the display display scanning signal Vscan supplied from the display gate driver 12A.

  The control unit 11 supplies control signals to the display gate driver 12A, the detection gate driver 12B, the source driver 13, the first electrode driver 14, and the signal processing unit 40 based on the video signal supplied from the outside. These circuits are controlled so as to operate in synchronization with each other or without synchronization.

  The display gate driver 12 </ b> A has a function of sequentially selecting one horizontal line as a display drive target of the display unit 10 with a detection function based on a control signal supplied from the control unit 11. The detection gate driver 12B outputs a detection scanning signal Vscan for detection based on a control signal supplied from the control unit 11, and becomes a detection target among a plurality of first electrodes 25 described later of the detection unit 30. It has a function of selecting the first electrode 25.

  The source driver 13 is a circuit that supplies a pixel signal Vpix to each sub-pixel SPix (described later) of the display unit 10 with a detection function based on a control signal supplied from the control unit 11. The control unit 11 may generate the pixel signal Vpix and supply the pixel signal Vpix to the source driver 13.

  The first electrode driver 14 supplies the detection drive signal Vs for detection or the display drive signal Vcom for display to the first electrode 25 of the display unit 10 with a detection function based on the control signal supplied from the control unit 11. Circuit.

  The detection unit 30 operates based on the basic principle of capacitive touch detection, performs a touch detection operation by a self-capacitance method, and detects contact or proximity of an external conductor. When detecting contact or proximity of an external conductor, the detection unit 30 outputs an output signal Sh that is an integrated value of detection signals from the selected first electrode.

  FIG. 2 is a block diagram illustrating a configuration example of the signal processing unit. The signal processing unit 40 is a circuit that detects the presence or absence of a touch on the detection unit 30 based on the control signal supplied from the control unit 11 and the output signal Sh supplied from the detection unit 30. In addition, the signal processing unit 40 obtains coordinates at which touch input is performed when there is a touch. The signal processing unit 40 includes a detection signal amplification unit 42, an A / D conversion unit 43, a signal calculation unit 44, a coordinate extraction unit 45, and a storage unit 47. Based on the control signal supplied from the control unit 11, the detection timing control unit 46 controls the A / D conversion unit 43, the signal calculation unit 44, and the coordinate extraction unit 45 to operate in synchronization.

  As described above, the detection unit 30 operates based on the basic principle of capacitive touch detection. Here, the basic principle of the self-capacitance type touch detection will be described with reference to FIGS. FIG. 3 is an explanatory view for explaining the basic principle of self-capacitance type touch detection. FIG. 4 is a diagram illustrating an example of a detection drive signal and a waveform of the detection signal in the self-capacitance type touch detection. FIG. 3 also shows the detection circuit.

In a state where the finger is not in contact with or in close proximity, an AC rectangular wave Sg having a predetermined frequency (for example, about several kHz to several hundred 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 a current fluctuation according to the AC rectangular wave Sg into a voltage fluctuation (solid line waveform V ₄ (see FIG. 4)). The voltage detector DET is an integration circuit included in the detection signal amplification unit 42 shown in FIG. 2, for example.

Next, as shown in FIG. 3, in a state where the finger is in contact with or close to the capacitance, the 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 corresponding to the capacitance C1 and the capacitance C2 flows. As shown in FIG. 4, the voltage detector DET converts a current fluctuation according to the AC rectangular wave Sg into a voltage fluctuation (dotted line waveform V ₅ ). Then, by integrating the obtained voltage values of the waveform V ₄ and the waveform V ₅ and comparing these values, it is possible to determine the presence or absence of finger contact or proximity to the detection electrode E1. The signal processing unit 40 is not limited to the content, and may compare the voltage values without integrating them. In FIG. 4, a method may be used in which a period until the waveform V ₂ and the waveform V ₃ are reduced to a predetermined reference voltage V _TH is obtained and these periods are compared.

Specifically, as shown in FIG. 3, the detection electrode E1 can be separated by a switch SW1 and a switch SW2. In FIG. 4, the AC rectangular wave Sg increases the voltage level corresponding to the voltage V ₀ at the timing of time T ₀₁ . At this time, the switch SW1 is on and the switch SW2 is off. Therefore detection electrodes E1 also becomes the voltage rise of the voltage V _0. Then to turn off the switch SW1 in front of the timing of time _{T 11.} At this time, although the detection electrode E1 is in a floating state, the capacitance (C1 + C2) obtained by adding the capacitance C1 of the detection electrode E1 or the capacitance C2 of the detection electrode E1 due to contact or proximity of a finger or the like , by reference to FIG. 3), the potential of the detection electrodes E1 are _{V 0} is maintained. Moreover, to off after a predetermined time has elapsed to turn on the switch SW3 before the timing of time T ₁₁ to reset the voltage detector DET. By this reset operation, the output voltage becomes substantially equal to Vref.

Subsequently, when turning on the switch SW2 at time _{T 11,} next to the voltage _{V 0} which inverting input is the detection electrode E1 of the voltage detector DET, then the capacitance C1 (or C1 + C2) and the voltage of the detection electrodes E1 The inverting input of the voltage detector DET is lowered to the reference voltage Vref according to the time constant of the capacitance C3 in the detector DET. At this time, since the electric charge accumulated in the electrostatic capacitance C1 (or C1 + C2) of the detection electrode E1 moves to the capacitance C3 in the voltage detector DET, the output of the voltage detector DET increases (the detection signal in FIG. 4). Vdet). The output of the voltage detector DET (detection signal Vdet), when the finger or the like to the detection electrodes E1 are not in close proximity, next waveform _{V 4} shown by a solid line, and _{Vdet = C1 · V 0 / C3} . When the electrostatic capacitance due to the influence of such a finger is added, becomes a waveform _{V 5} shown by a dotted line, and _{Vdet = (C1 + C2) ·} V 0 / C3.

Then, turn off the switch SW2 at time _{T 31} after the charge is sufficiently moved to the capacitor C3 of the capacitance C1 of the detection electrodes E1 (or C1 + C2), by turning on the switch SW1 and the switch SW3, the detection electrode The potential of E1 is set to a low level that is the same potential as the AC rectangular wave Sg, and the voltage detector DET is reset. At this time, the timing to turn on the switch SW1 may be any timing before the time _T02 after the switch SW2 is turned off. The timing for resetting the voltage detector DET is, after turning off the switch SW2, may be any timing as long as the time T ₁₂ before.

The above operation is repeated at a predetermined frequency (for example, about several kHz to several hundred kHz). Based on the absolute value | ΔV | of the difference between the waveform V ₄ and the waveform V ₅ , the presence or absence of an external proximity object (the presence or absence of a touch) can be measured. The potential of the detecting electrode E1, as shown in FIG. 4, when the finger or the like is not close has a waveform of V _2, the waveform of V ₃ when the electrostatic capacitance C2 due to the influence of a finger or the like is added It becomes. It is also possible to measure the presence / absence of an external proximity object (the presence / absence of touch) by measuring the time during which the waveform V ₂ and the waveform V ₃ fall to a predetermined reference voltage V _TH .

  The detection signal amplification unit 42 illustrated in FIG. 2 amplifies the output signal Sh supplied from the detection unit 30. The detection signal amplifying unit 42 may include an analog LPF (Low Pass Filter) that is a low-pass analog filter that removes and outputs a high frequency component (noise component) included in the output signal Sh.

  The A / D converter 43 samples the analog signal output from the detection signal amplifier 42 at a timing synchronized with the detection drive signal Vs, and converts it into a digital signal.

The signal calculation unit 44 includes a digital filter that reduces frequency components (noise components) included in the output signal output from the A / D conversion unit 43 other than the frequency obtained by sampling the detection drive signal Vs. The signal calculation unit 44 is a logic circuit that detects the presence or absence of a touch on the detection unit 30 based on the output signal output from the A / D conversion unit 43. The signal calculation unit 44 performs a process of extracting the difference between the detection signals Vdet by the finger included in the output signal Sh. The difference signal by the finger is the absolute value | ΔV | of the difference between the waveform V ₄ and the waveform V ₅ described above. The signal calculation unit 44 compares the detected difference signal by the finger with a predetermined threshold voltage, and determines that the external proximity object is in a non-contact state if it is less than this threshold voltage. On the other hand, the signal calculation unit 44 compares the detected difference signal by the finger with a predetermined threshold voltage, and determines that the contact state of the external proximity object is found if it is equal to or higher than the threshold voltage. In this way, the signal processing unit 40 can perform touch detection. Further, as will be described later, the signal calculation unit 44 receives the output signals Sh from the plurality of first electrodes 25 to be detected, and performs calculation processing based on a predetermined code. The third output signal calculated by the signal calculation unit 44 is temporarily stored in the storage unit 47. The storage unit 47 may be, for example, a RAM (Random Access Memory), a ROM (Read Only Memory), a register circuit, or the like.

  The coordinate extraction unit 45 is a logic circuit that calculates touch panel coordinates when a touch is detected by the signal calculation unit 44. The coordinate extraction unit 45 receives the third output signal stored in the storage unit 47 and performs a decoding process based on a predetermined code. In other words, the coordinate extraction unit 45 calculates the detection signal Vdet based on the output signal Sh. The coordinate extraction unit 45 calculates touch panel coordinates based on the decoded information, and outputs the obtained touch panel coordinates as a detection signal output Vout. Note that the coordinate extraction unit 45 may output the detection signal Vdet as the detection signal output Vout without calculating the touch panel coordinates. As described above, the display device 1 according to the present embodiment can detect touch panel coordinates at a position where a conductor such as a finger contacts or approaches based on the basic principle of touch detection by the self-capacitance method.

  FIG. 5 is a diagram illustrating an example of a module in which a display device is mounted. As shown in FIG. 5, the display device 1 includes a pixel substrate 2 (first substrate 21) described later and a printed circuit board 71. The printed circuit board 71 is a flexible printed circuit board, for example. The pixel substrate 2 (first substrate 21) is mounted with a first semiconductor integrated circuit (first IC) 19, for example, COG (Chip On Glass), and the display area Ad of the display panel 20 described above and the outside of the display area Ad. A frame region Gd, which is a region of A first semiconductor integrated circuit (first IC) 19 is a chip of an IC driver mounted on the first substrate 21, and a control device incorporating each circuit necessary for display operation functioning as the control unit 11 shown in FIG. It is. In the present embodiment, the display gate driver 12 </ b> A, the detection gate driver 12 </ b> B, the source driver 13, and the first electrode driver 14 described above are formed on the first substrate 21. The source driver 13 may be built in the first semiconductor integrated circuit (first IC) 19. Further, the display device 1 may incorporate circuits such as the first electrode driver 14, the display gate driver 12 </ b> A, and the detection gate driver 12 </ b> B in the first semiconductor integrated circuit (first IC) 19. Note that the COG is just a form of mounting and is not limited to this. For example, a configuration having the same function as the first semiconductor integrated circuit (first IC) 19 may be provided by COF (Chip on film or Chip on flexible).

  As shown in FIG. 5, a plurality of first electrodes 25 are provided in a matrix at a position overlapping the display area Ad of the first substrate 21. The first electrode 25 has a rectangular shape, and a plurality of first electrodes 25 are arranged in the direction along the long side and the short side of the display area Ad. A detection drive signal Vs is supplied to each first electrode 25 from the first electrode driver 14. Each first electrode 25 is connected to a second semiconductor integrated circuit (second IC) 49 mounted on the printed circuit board 71 via the printed circuit board 71. The second semiconductor integrated circuit (second IC) 49 functions as the signal processing unit 40 shown in FIG. An output signal Sh obtained by integrating the detection signals Vdet of the first electrodes 25 is output to the second semiconductor integrated circuit (second IC) 49 via the printed circuit board 71. The first electrodes 25 are each connected to a second semiconductor integrated circuit (second IC) 49, but are not limited thereto. For example, the first semiconductor integrated circuit (first IC) 19 may incorporate the function of the signal processing unit 40, and each first electrode 25 may be connected to the first semiconductor integrated circuit (first IC) 19.

  The printed circuit board 71 is not limited to a flexible printed circuit board, and may be a rigid circuit board or a rigid flexible circuit board. Further, the second semiconductor integrated circuit (second IC) 49 may not be mounted on the printed circuit board 71, but on a control board outside the module connected via the printed circuit board 71 or on the first board 21. May be provided. In the present embodiment, the second semiconductor integrated circuit (second IC) 49 is a touch driver IC mounted on the printed circuit board 71, but a part of the function of the signal processing unit 40 is the first semiconductor integrated circuit (first IC). 19 or other MPU functions may be provided. Specifically, some functions (for example, noise removal) among various functions such as A / D conversion and noise removal that can be provided as functions of the touch driver IC are provided separately from the touch driver IC. One semiconductor integrated circuit (first IC) 19 or a circuit such as an MPU may be used. The signal calculation unit 44, the coordinate extraction unit 45, and the storage unit 47 illustrated in FIG. 2 may be included in the first semiconductor integrated circuit (first IC) 19 or an external MPU. Further, when the first semiconductor integrated circuit (first IC) 19 and the second semiconductor integrated circuit (second IC) 49 are integrated into one IC (one-chip configuration), for example, wiring on the first substrate 21 or You may make it transmit a detection signal to the 1st semiconductor integrated circuit (1st IC) 19 on the 1st board | substrate 21 via wiring, such as the printed circuit board 71. FIG.

  The source driver 13 is formed in the vicinity of the display area Ad on the first substrate 21. A large number of sub-pixels SPix, which will be described later, are arranged in a matrix (matrix) in the display area Ad. The frame region Gd is a region where the sub-pixel SPix is not arranged when the surface of the first substrate 21 is viewed from the vertical direction.

  The display gate driver 12A, the detection gate driver 12B, and the first electrode driver 14 are formed in the frame region Gd on the first substrate 21 using TFT elements. In the present embodiment, two circuits of the display gate driver 12A and the detection gate driver 12B are provided. However, the present invention is not limited to this. For example, one circuit provided on one side of the frame region Gd is used. There may be. The first electrode driver 14 is provided on one side of the frame region Gd where the printed circuit board 71 is provided, but is not limited thereto, and may be provided in the vicinity of the display gate driver 12A or the detection gate driver 12B. Good. The first electrode driver 14 is provided with one circuit, but may be configured with two circuits.

  Next, a configuration example of the display unit 10 with a detection function will be described in detail. FIG. 6 is a cross-sectional view illustrating a schematic cross-sectional structure of the display unit with a detection function. As shown in FIG. 6, the display unit 10 with a detection function includes a pixel substrate 2, a counter substrate 3 disposed to face the pixel substrate 2 in a direction perpendicular to the surface, the pixel substrate 2, the counter substrate 3, And a display function layer (for example, a liquid crystal layer 6) inserted between them. In other words, a display function layer is provided between the first substrate 21 and the second substrate 31. The display function layer may be configured as the pixel substrate 2. For example, the display functional layer may be disposed between the first electrode 25 and the second electrode 22.

  The pixel substrate 2 includes a first substrate 21 as a circuit substrate, a plurality of second electrodes (pixel electrodes) 22 disposed in a matrix above the first substrate 21, and the first substrate 21 and the second electrode. A plurality of first electrodes (detection electrodes) 25 formed between the first electrode 25 and the insulating layer 24 that insulates the first electrode 25 and the second electrode 22 from each other. A TFT (Thin Film Transistor) is arranged on the first substrate 21. A polarizing plate (not shown) may be provided below the first substrate 21 via an adhesive layer. For the first electrode 25 and the second electrode 22, for example, a light-transmitting conductive material such as ITO (Indium Tin Oxide) is used.

  In the present embodiment, the first electrode 25, the insulating layer 24, and the second electrode 22 are stacked in this order on the first substrate 21, but the present invention is not limited to this. The second electrode 22, the insulating layer 24, and the first electrode 25 may be stacked in this order on the first substrate 21, and the first electrode 25 and the second electrode 22 are in the same layer via the insulating layer 24. May be formed. Furthermore, at least one of the first electrode 25 and the second electrode 22 may be disposed on the second substrate 31.

  The counter substrate 3 includes a second substrate 31 and a color filter 32 formed on one surface of the second substrate 31. Furthermore, a polarizing plate 35 is provided on the second substrate 31 via an adhesive layer. 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 liquid crystal layer 6 is provided between the first substrate 21 and the second substrate 31. The liquid crystal layer 6 modulates light passing therethrough according to the state of the electric field, and for example, a liquid crystal in a transverse electric field mode such as IPS (in-plane switching) including FFS (fringe field switching) is used. Note that alignment films may be provided between the liquid crystal layer 6 and the pixel substrate 2 and between the liquid crystal layer 6 and the counter substrate 3 shown in FIG.

  An illumination unit (not shown) is provided below the first substrate 21. The illumination unit includes a light source such as an LED, and emits light from the light source toward the first substrate 21. Light from the illumination unit passes through the pixel substrate 2, and an image is displayed on the display surface by switching between a part where light is blocked by the state of the liquid crystal at that position and a part where the light is not emitted. In the case of a reflective liquid crystal display device in which a reflective electrode that reflects light incident from the second substrate 31 side is provided as the second electrode 22 and a translucent first electrode 25 is provided on the counter substrate 3 side. The illumination unit may not be provided below the first substrate 21. The reflective liquid crystal display device may be provided with a front light above the second substrate 31. In this case, light incident from the second substrate 31 side is reflected by the reflective electrode (second electrode 22), passes through the second substrate 31, and reaches the eyes of the observer. Further, when an organic EL display panel is used as the display panel 20 (see FIG. 1), each subpixel SPix has a self-luminous body, and an image is displayed by controlling the lighting amount of the self-luminous body. Therefore, it is not necessary to provide an illumination unit. When an organic EL display panel is used as the display panel 20, the display function layer may be included in the pixel substrate 2. For example, a light emitting layer that is a display function layer may be disposed between the first electrode and the second electrode.

  FIG. 7 is a circuit diagram illustrating a pixel arrangement of the display unit with a detection function according to the first embodiment. The first substrate 21 shown in FIG. 6 includes a switching element Tr of each sub-pixel SPix shown in FIG. 7, a data line SGL that supplies a pixel signal Vpix to each second electrode 22, and a gate line GCL that drives each switching element Tr. Etc. are formed. The data line SGL and the gate line GCL extend in a plane parallel to the surface of the first substrate 21.

  The display panel 20 shown in FIG. 7 has a plurality of subpixels SPix arranged in a matrix. Each subpixel SPix includes a switching element Tr and a liquid crystal element LC. The switching element Tr is composed of a thin film transistor. In this example, the switching element Tr is composed of an n-channel MOS (Metal Oxide Semiconductor) TFT. One of the source and drain of the switching element Tr is connected to the data line SGL, the gate is connected to the gate line GCL, and the other of the source and drain is connected to one end of the liquid crystal element LC. The second electrode 22 (not shown in FIG. 7) is connected to the other of the source and the drain of the switching element Tr, and the liquid crystal element LC is connected to the switching element Tr via the second electrode 22. . The liquid crystal element LC has one end connected to the other of the source and drain of the switching element Tr and the other end connected to the selection electrode block 25A. The selection electrode block 25A includes a plurality of first electrodes 25 corresponding to one horizontal line of the subpixel SPix. Then, the subpixel SPix is driven in accordance with the electric charge applied to the first electrode 25 and the second electrode 22.

  The subpixel SPix is connected to other subpixels SPix belonging to the same row of the display panel 20 by the gate line GCL. The gate line GCL is connected to the display gate driver 12A (see FIG. 1), and the display scanning signal Vscan is supplied from the display gate driver 12A. Further, the subpixel SPix is connected to another subpixel SPix belonging to the same column of the display panel 20 by the data line SGL. The data line SGL is connected to the source driver 13 (see FIG. 1), and the pixel signal Vpix is supplied from the source driver 13. The first electrode 25 (common electrode) is connected to the first electrode driver 14 (see FIG. 1), and the display drive signal Vcom is supplied from the first electrode driver 14. The display drive signal Vcom is a DC voltage signal for applying a common potential to the plurality of subpixels SPix. In this example, a plurality of subpixels SPix belonging to the same row share one selection electrode block 25A.

  In the present embodiment, the extending direction of the selection electrode block 25A has been described as being parallel to the extending direction of the gate line GCL, but is not limited thereto. The extending direction of the selection electrode block 25A may be parallel to the extending direction of the data line SGL. In that case, a plurality of subpixels SPix belonging to the same column share one selection electrode block 25A, and the first electrode driver 14 is connected to either end in the extending direction of the data line SGL on the display panel 20. It will be arranged in the part.

  The display gate driver 12A shown in FIG. 1 is driven so as to sequentially scan the gate lines GCL. The display scanning signal Vscan is applied to the gate of the switching element Tr of the subpixel SPix via the gate line GCL, and one horizontal line of the subpixel SPix is sequentially selected as a display driving target. In the display device 1, the source driver 13 supplies the pixel signal Vpix to the sub-pixel SPix belonging to one horizontal line, so that display is performed for each horizontal line. When performing this display operation, the first electrode driver 14 applies the display drive signal Vcom to at least the selection electrode block 25A corresponding to the one horizontal line. The first electrode driver 14 includes a plurality of first electrodes 25 including the first electrodes 25 (common electrodes) of the selection electrode block 25A corresponding to one horizontal line to which the display scanning signal Vscan is applied or all of the first display drivers Ad. A display drive signal Vcom may be applied to the electrode 25.

  In the color filter 32 shown in FIG. 6, for example, color regions 32R, 32G, and 32B of color filters colored in three colors of red (R), green (G), and blue (B) are periodically arranged. Each of the sub-pixels SPix shown in FIG. 7 is associated with the color regions 32R, 32G, and 32B of three colors R, G, and B as one set, and the pixel Pix with the color regions 32R, 32G, and 32B as a set. Composed. As shown in FIG. 6, the color filter 32 faces the liquid crystal layer 6 in a direction perpendicular to the first substrate 21. The color filter 32 may be a combination of other colors as long as it is colored in a different color. The color filter 32 is not limited to a combination of three colors, and may be a combination of four or more colors. Further, the display unit 10 with the detection function may not be provided with the color filter 32 but may be monochrome display.

  The first electrode 25 illustrated in FIGS. 6 and 7 functions as a common electrode that applies a common potential to the plurality of subpixels SPix of the display panel 20 and also functions as a detection electrode when performing touch detection of the detection unit 30. . FIG. 8 is a circuit diagram illustrating an arrangement of the first electrodes of the detection unit according to the first embodiment.

  The detection unit 30 illustrated in FIG. 8 includes first electrodes 25 provided in a matrix on the first substrate 21 (see FIG. 6). One first electrode 25 (detection electrode) may be provided corresponding to one subpixel SPix described above, and one first electrode 25 is provided corresponding to a plurality of subpixels SPix. Also good. Each of the first electrodes 25 includes a detection switching element Trs. The detection switching element Trs is constituted by a thin film transistor, and in this example, is constituted by an n-channel MOS (Metal Oxide Semiconductor) type TFT. The detection gate lines GCLs extend in the row direction, and a plurality of detection gate lines GCLs are arranged in the column direction. The detection data lines SGLs extend in the column direction and are arranged in the row direction. The first electrode 25 is provided in a region surrounded by the detection gate lines GCLs and the detection data lines SGLs. The detection switching elements Trs are provided in the vicinity of the intersection between the detection gate line GCLs and the detection data line SGLs, and a plurality of detection switching elements Trs are provided corresponding to each of the first electrodes 25.

  The switching element for detection Trs may be provided on the first substrate 21 in the same layer as the switching element Tr illustrated in FIG. 7 or may be provided in a different layer. The detection gate line GCLs extends in a direction parallel to the gate line GCL shown in FIG. 7, and the detection data line SGLs extends in a direction parallel to the data line SGL shown in FIG. The detection gate line GCLs may be provided in the same layer as the gate line GCL, or may be provided in a different layer. The detection data line SGLs may be provided in the same layer as the gate line GCL, or may be provided in a different layer.

  The detection switching element Trs has a source connected to the detection data line SGLs, a gate connected to the detection gate line GCLs, and a drain connected to the first electrode 25. Here, an electrode block including a plurality of first electrodes 25 connected to a common detection gate line GCLs is a selection electrode block 25A, and includes a plurality of first electrodes 25 connected to a common detection data line SGLs. The electrode block is a detection electrode block 25B. Further, as shown in FIG. 8, the detection data lines SGLs and the detection electrode block 25B arranged in the m-th column are indicated as detection data lines SGLs (m) and detection electrode block 25B (m), respectively, and n The detection gate lines GCLs and the selection electrode block 25A arranged in the row are shown as detection gate lines GCLs (n) and a selection electrode block 25A (n), respectively.

  The detection gate driver 12B shown in FIG. 1 is a selection drive unit that drives to select one or more detection gate lines GCLs from among the detection gate lines GCLs. The detection scanning signal Vscans is applied to the gate of the detection switching element Trs via the selected detection gate line GCLs, and one or more selection electrode blocks 25A are selected as detection targets. The first electrode driver 14 (see FIG. 1) supplies the detection drive signal Vs to the first electrodes 25 belonging to the selection electrode block 25A via the detection data lines SGLs. Then, the first electrode 25 belonging to the detection electrode block 25B outputs a detection signal Vdet corresponding to the capacitance change of each first electrode 25 to the signal processing unit 40 via the detection data line SGLs. The first electrode 25 of this embodiment corresponds to the detection electrode E1 in the basic principle of the self-capacitance touch detection described above, and the detection unit 30 follows the basic principle of the self-capacitance touch detection described above. A finger touching or in close proximity can be detected.

  FIG. 9 is a schematic diagram illustrating an example of the detection operation. The first electrode block BKN includes, for example, four selection electrode blocks 25A, and a plurality of first electrode blocks BKN-1, BKN,... BKN + p are arranged in the column direction. The detection gate driver 12B sequentially selects the plurality of first electrode blocks BKN-1, BKN,... BKN + p, and the selected electrode block 25A of the selected plurality of first electrode blocks BKN-1, BKN,. A detection drive signal Vs is supplied. The first electrode blocks BKN-1, BKN,... BKN + p that are not selected are in a so-called floating state in which no voltage signal is supplied and the potential is not fixed. For some non-selected electrode blocks, a voltage signal having the same potential as the detection drive signal Vs is supplied in order to reduce the additional capacitance between the selected first electrode block and the non-selected first electrode block. Also good.

  By sequentially selecting a plurality of first electrode blocks BKN-1, BKN,... BKN + p and performing a detection operation, the entire detection of one detection surface is executed. Each of the first electrode blocks BKN-1, BKN,... BKN + p includes four selection electrode blocks 25A, but is not limited to four, and may be two, three, or five or more. Further, the detection gate driver 12B may sequentially scan the selection electrode block 25A for each row. The first electrode blocks BKN-1, BKN,... BKN + p may be arranged so that some of the selection electrode blocks 25A overlap. Moreover, the plurality of first electrode blocks BKN-1, BKN,... BKN + p are not limited to the configuration arranged in the column direction, and may be arranged in a matrix.

  As an example of the operation method of the display device 1, the display device 1 may perform the above-described display operation (display period) and touch detection operation (detection period) in a time-sharing manner. The touch detection operation and the display operation may be performed in any manner. Hereinafter, one frame period (1F) of the display panel 20, that is, the time required for displaying video information for one screen is displayed. The method for dividing the touch detection operation and the display operation into a plurality of times will be described.

  FIG. 10 is a schematic diagram illustrating an example of the arrangement of the display period and the detection period. One frame period (1F) includes two display periods Pd1 and Pd2 and two detection periods Pt1 and Pt2. These periods are displayed on the time axis as a display period Pd1, a detection period Pt1, and a display period Pd2. The detection periods Pt2 are alternately arranged.

  The control unit 11 (see FIG. 1) sends the pixel signal Vpix to the sub-pixels SPix (see FIG. 7) in a plurality of rows selected in the display periods Pd1 and Pd2 via the display gate driver 12A and the source driver 13. Supply.

  Further, the control unit 11 (see FIG. 1) supplies the detection drive signal Vs to the first electrode 25 selected in each of the detection periods Pt1 and Pt2 by the first electrode driver 14. Based on the detection signal Vdet supplied from the first electrode 25, the signal processing unit 40 calculates the presence / absence of touch input and the coordinates of the input position.

  In the present embodiment, since the first electrode 25 also serves as a common electrode of the display panel 20, the control unit 11 determines the selection electrode block 25A selected via the first electrode driver 14 in the display periods Pd1 and Pd2. A display drive signal Vcom that is a common electrode potential for display is supplied to each first electrode 25.

  In FIG. 10, video display for one screen is performed twice in one frame period (1F), but the display period in one frame period (1F) is further divided into more times. May be. As for the detection period, more times may be provided in one frame period (1F).

  In the detection periods Pt1 and Pt2, half of each detection surface may be touch-detected, or each may perform touch detection for one screen. Touch detection of one first electrode block among the above-described first electrode blocks BKN-1, BKN,... BKN + p may be performed in one detection period Pt1, Pt2. Further, thinning detection or the like may be performed as necessary. Further, the display operation and the touch detection operation during one frame period (1F) may be performed once without dividing into a plurality of times.

  In the detection periods Pt1 and Pt2, the display gate line GCL and the data line SGL (see FIG. 7) may be in a floating state in which a voltage signal is not supplied and a potential is not fixed. The display gate line GCL and the data line SGL may be supplied with signals having the same waveform synchronized with the detection drive signal Vs. Thereby, the parasitic capacitance between the first electrode 25 to be detected and the gate line GCL and the parasitic capacitance between the first electrode 25 and the data line SGL are reduced. The decrease can be suppressed.

  Next, an example of code division selection driving of the detection unit 30 of this embodiment will be described. FIG. 11 is a block diagram illustrating a configuration example of the drive circuit according to the first embodiment. As shown in FIG. 11, the detection gate driver 12B includes a scanning signal generation unit 15a and a counter 15b. Based on the clock signal supplied from the control unit 11, the counter 15b supplies a timing control signal for controlling the timing for selecting the detection gate line GCLs to the scanning signal generation unit 15a. The scanning signal generation unit 15a generates the detection scanning signal Vscans, and supplies the detection scanning signal Vscans to the selected detection gate lines GCLs based on the timing control signal supplied from the counter 15b. The scanning signal generation unit 15a may sequentially select the detection gate lines GCLs or may select a plurality of the gate lines simultaneously.

  For example, the detection gate driver 12B is supplied with the reset signal Reset at the timing when the above-described detection period Pt ends, and the scanning signal generation unit 15a and the counter 15b are reset.

  As shown in FIG. 11, a multiplexer 14 </ b> B is connected to the detection unit 30. The multiplexer 14B connects the first electrode 25 and the drive signal generation unit 14A via the detection data lines SCLs (see FIG. 8), and connects the first electrode 25 and the signal processing unit 40. The selection signal generation unit 16 generates a selection signal for selecting the first electrode 25 to be detected based on a predetermined code described later. Based on the clock signal supplied from the control unit 11, the counter 17 outputs a timing control signal for controlling the timing for selecting the detection-target first electrode 25 to the selection signal generation unit 16. The selection signal generator 16 outputs a selection signal to the multiplexer 14B based on the timing control signal from the counter 17. Based on the selection signal, the multiplexer 14B is connected to the first electrode 25 to be detected via the detection data line SCLs (see FIG. 8) and releases the connection with the first electrode 25 other than the detection target. . In this way, the first electrode 25 to be detected is selected by the multiplexer 14B.

  The drive signal generator 14A supplies the detection drive signal Vs to the selected detection data line SCLs via the multiplexer 14B. The first electrode 25 selected as the detection target is supplied with the detection drive signal Vs sequentially or simultaneously via the detection data line SCLs. The output signal Sh from the first electrode 25 is output to the signal processing unit 40 via the multiplexer 14B. Through the multiplexer 14B, the configuration for switching the connection between the first electrode 25, the drive signal generation unit 14A, and the signal processing unit 40 can be simplified. The supply of the detection drive signal Vs and the output of the output signal Sh can be switched by, for example, the switch elements SW5 and xSW5. When the switch element SW5 is turned on (opened), the switch element xSW5 is turned off (closed), and the output signal Sh is output to the signal processing unit 40 via the wiring L2 and the wiring L3. When the switch element SW5 is off (closed), the switch element xSW5 is turned on (opened), and the detection drive signal Vs is supplied to the detection target first electrode 25 via the wiring L1 and the wiring L3.

  The multiplexer 14B, the switch elements SW5 and xSW5, the wirings L1, L2, and L3, the selection signal generation unit 16, the counter 17, and the drive signal generation unit 14A are included in the first electrode driver 14 and the control unit 11 illustrated in FIG. May be. For example, the first electrode driver 14 may function as the multiplexer 14B, the switch elements SW5 and xSW5, the wirings L1, L2, and L3, and the control unit 11 may function as the selection signal generation unit 16 and the counter 17. The multiplexer 14B, the switch elements SW5 and xSW5, and the wirings L1, L2, and L3 are provided on the first substrate 21. The drive signal generator 14A and the multiplexer 14B may be included in the first electrode driver 14 or may be a circuit provided separately from the first electrode driver 14. The multiplexer 14B corresponds to the “selection connection unit” of the present invention.

  The detection unit 30 of the present embodiment selects the first electrode 25 to be detected for the second electrode block BKNB (n) based on a predetermined code. Specifically, the multiplexer 14B connects the first electrode 25 selected as the detection target and the drive signal generation unit 14A. As a result, the detection drive signal Vs is supplied to the first electrode 25 selected as the detection target. In addition, a detection signal is output from each first electrode 25 based on the capacitance change of the selected first electrode 25. A signal obtained by integrating the detection signals of the first electrodes 25 is output as an output signal to the signal processing unit 40 via the multiplexer 14B.

FIG. 12 is an explanatory diagram for explaining a selection pattern of the first electrode selected as a detection target. FIG. 12A shows a selection pattern of the first electrode of the first detection operation Tc ₀ , and FIG. 12B shows a selection pattern of the first electrode of the second detection operation Tc ₁ , and FIG. ) shows a selection pattern of the third first electrode of the detecting operation Tc _2, FIG. 12 (D) shows a selection pattern of the fourth first electrode of the detection operation Tc _3.

  In FIG. 12, one second electrode block BKNB (n) will be described. The second electrode block BKNB (n) includes a plurality of first electrodes 25 connected to the multiplexer 14B via a common wiring L3. The second electrode block BKNB (n) includes four first electrodes 25 arranged in the row direction, and the four first electrodes 25 are respectively the detection electrode blocks 25B (m), 25B (m + 1), and 25B (m + 2). ), 25B (m + 3). The four first electrodes 25 are connected to common detection gate lines GCLs (n) (see FIG. 8).

Here, the signal value of the detection signal output from each first electrode 25 is represented by Si _q . A signal value obtained by integrating the signal values Si _q of the first electrode 25 selected by the selection signal is output from the second electrode block BKNB (n) through the multiplexer 14B as the output signal Sh _p . The output signal Sh _p is expressed by the following equation (1). That is, the output signal Sh _p is represented by the sum of signal values Si _q output from the plurality of first electrodes 25.

  In FIG. 12, the switch elements SW5 and xSW5, the wirings L1 and L2, the selection signal generation unit 16, the counter 17, and the drive signal generation unit 14A in FIG. 11 are omitted. Also in FIG. 12, as described in FIG. 11, the output signal Sh is output to the signal processing unit 40 via the wiring L2 and the wiring L3, and the detection drive signal Vs is detected via the wiring L1 and the wiring L3. The first electrode 25 is supplied.

Here, Si _q is a signal value corresponding to the detection signal from each first electrode 25 of the detection electrode blocks 25B (m), 25B (m + 1), 25B (m + 2), and 25B (m + 3). Si _q is the capacitance C1 of the detection electrode E1 or the capacitance C2 due to contact or proximity of a finger or the like to the capacitance C1 of the detection electrode E1 in the basic principle of touch detection of the self-capacitance method described above. This is a signal value output based on the added capacitance (C1 + C2, see FIG. 4). Sh _p is an output signal of the second electrode block BKNB (n), and is obtained by calculating an output signal of the first electrode 25 selected based on a predetermined sign in the second electrode block BKNB (n). Value. The predetermined code is defined by, for example, a square matrix H _h in the following formula (2). The square matrix H _h is a Hadamard matrix, and is a square matrix having “1” or “−1” as elements and any two different rows being orthogonal matrices.

Order square matrix _{H h,} the number of the first electrode 25 in the second electrode block BKNB (n), i.e., a 4 is the number of four detection electrodes block 25B. In the present embodiment, the second electrode block BKNB (n) including the four first electrodes 25 will be described. However, the present invention is not limited to this, and the number of the first electrodes 25 included in the second electrode block BKNB (n) is There may be two, three, five or more. In this case, the order of the square matrix H _h is also changed according to the number of first electrodes 25 that are selectively controlled by the multiplexer 14B.

The first electrode 25 corresponding to the square matrix H _h corresponds to a plurality of second electrode blocks BKNB (n), BKNB (n + 1), BKNB (n + 2). The second electrode block BKNB (n), BKNB (n + 1), by sequentially performing the detection operation based on the square matrix _{H h} for BKNB (n + 2) ..., the entire detection of one detection surface is performed. The second electrode blocks BKNB (n), BKNB (n + 1), BKNB (n + 2)... May be arranged so that some of the first electrodes 25 overlap. That is, some detection operations based on the four square matrices H _h may be performed twice for the eight electrodes of the first electrodes 25, and some detection operations based on the five square matrices may be performed twice. You may implement so that it may overlap regarding the 1st electrode 25. FIG. The second electrode blocks BKNB (n), BKNB (n + 1), BKNB (n + 2)... Are not limited to the configuration arranged in the column direction, and may be arranged in a matrix. The number of the second electrode blocks BKNB is not limited to a plurality, and may be one.

As shown in FIG. 12A to FIG. 12D, the detection operation is divided into four detection operations: a first detection operation Tc ₀ , a second detection operation Tc ₁ , a third detection operation Tc _2, and a fourth detection operation Tc _3. An example of code division selection driving will be described. In the first detection operation Tc ₀ shown in FIG. 12A, the first electrode 25 is selected according to the selection signal corresponding to the first row of the square matrix H _h . Second In the detection operation Tc ₁ shown in FIG. 12 (B), the first electrode 25 in response to the selection signal corresponding to the second row of the square matrix H _h is selected. In the third detection operation Tc ₂ shown in FIG. 12 (C), the first electrode 25 in response to the selection signal corresponding to the third row of the square matrix H _h is selected. In the fourth detection operation Tc ₃ shown in FIG. 12 (D), the first electrode 25 in response to the selection signal corresponding to the fourth row of the square matrix H _h is selected.

The first detection operation Tc ₀ , the second detection operation Tc ₁ , the third detection operation Tc _2, and the fourth detection operation Tc ₃ are respectively positive code selection operations Tc ₀ ⁺ , Tc ₁ ⁺ , Tc ₂ ⁺ , Tc ₃ ⁺ , Negative sign selection operations Tc ₀ ⁻ , Tc ₁ ⁻ , Tc ₂ ⁻ and Tc ₃ ⁻ . In the positive code selection operations Tc ₀ ⁺ , Tc ₁ ⁺ , Tc ₂ ⁺ , Tc ₃ ⁺ , the second electrode block BKNB (n) is changed according to the first selection signal corresponding to the component “1” of the square matrix H _h . Of these, the first electrode 25 to be the first detection target is selected. In FIG. 12, the selected first electrode 25 is indicated by hatching. A first output signal Sh _p ⁺ (p = 0, 1, 2, 3) is output from the first electrode 25 to be detected through the multiplexer 14B. Here, the first output signal Sh _p ⁺ is a signal in which the detection signals of the first electrodes 25 of the first detection target included in the second electrode block BKNB (n) are integrated.

In the negative sign selection operations Tc ₀ ⁻ , Tc ₁ ⁻ , Tc ₂ ⁻ , Tc ₃ ⁻ , the second electrode block BKNB (n) is selected according to the second selection signal corresponding to the component “−1” of the square matrix H _h. Among these, the first electrode 25 of the second detection target that is not included in the first detection target is selected. The second output signal Sh _p ⁻ (p = 0, 1, 2, 3) is output from the first electrode 25 to be detected through the multiplexer 14B. Here, the second output signal Sh _p ⁻ is a signal obtained by integrating the detection signals of the first electrodes 25 to be detected included in the second electrode block BKNB (n). In this embodiment, a positive sign selection operation ^{_{Tc p + (p = 0,1,2,3)}} , the negative sign selection operation _Tc ^p - and (p = 0, 1, 2, 3) is performed in time division The Therefore, each output signal is output to one voltage detector DET (see FIGS. 3 and 4) in a time-sharing manner, so that the configuration of the signal processing unit 40 can be simplified.

The signal calculation unit 44 (see FIG. 2) of the signal processing unit 40 calculates the third output signal Sh _p = Sh _p ⁺ by calculating the difference between the first output signal Sh _p ⁺ and the second output signal Sh _p ^−. -Sh _p ^- is calculated. The signal calculation unit 44 outputs the third output signal Sh _p to the storage unit 47 and temporarily stores the third output signal Sh _p . When the first electrode group selected according to the selection signal is the electrode E1, the first output signal Sh _p ⁺ and the second output signal Sh _p ⁻ are the basics of the self-capacitance type touch detection described above. This corresponds to the detection signal Vdet in principle.

When the order of the square matrix H _h is 4, as shown in the following equation (3), four output signals (Sh ₀ , Sh ₁ , Sh ₂ , Sh ₃ ) are generated from one second electrode block BKNB (n). ) Is obtained. In this case, the four first output signals Sh ₀ ⁺ , Sh ₁ ⁺ , Sh ₂ ⁺ , Sh ₃ ⁺ and the four second output signals Sh ₀ ⁻ , Sh ₁ ⁻ , Sh ₂ ⁻ , Sh ₃ ⁻ Three output signals (Sh ₀ , Sh ₁ , Sh ₂ , Sh ₃ ) are respectively obtained.

In the following, the detection signal value detected from each first electrode 25 of the second electrode block BKNB (n) is (Si ₀ , Si ₁ , Si ₂ , Si ₃ ) = ( ₁ , ₇ , ₃ , ₂ ). A case will be described as an example. The detection signal Si ₀ is a detection signal of the first electrode 25 corresponding to the detection electrode block 25B (m). The detection signal Si ₁ is a detection signal of the first electrode 25 corresponding to the detection electrode block 25B (m + 1). The detection signal Si ₂ is a detection signal of the first electrode 25 corresponding to the detection electrode block 25B (m + 2). The detection signal Si ₃ is a detection signal of the first electrode 25 corresponding to the detection electrode block 25B (m + 3).

As shown in FIG. 12A, in the positive sign selection operation Tc ₀ ⁺ of the first detection operation Tc ₀ , four detection targets corresponding to the component “1” in the first row of the square matrix H _h The first electrode 25 is selected. Four first electrodes 25 are connected to the multiplexer 14B. The first output signal Sh ₀ ⁺ is Sh ₀ ⁺ = 1 × 1 + 1 × 7 + 1 × 3 + 1 × 2 = 13 from the equation (3). In the negative sign selection operation Tc ₀ ⁻ , the component “−1” in the first row of the square matrix H _h does not exist, so the first electrode 25 is not selected as the second detection target corresponding to the component “−1”. That is, the four first electrodes 25 are disconnected from the multiplexer 14B. Therefore, the second output signal Sh ₀ ⁻ is Sh ₀ ⁻ = 0 × 1 + 0 × 7 + 0 × 3 + 0 × 2 = 0. From the difference between the first output signal Sh ₀ ⁺ and the second output signal Sh ₀ ⁻ , the third output signal Sh ₀ becomes Sh ₀ = Sh ₀ ⁺ −Sh ₀ ⁻ = 13−0 = 13.

Next, as shown in FIG. 12B, in the positive sign selection operation Tc ₁ ⁺ of the second detection operation Tc ₁ , the first detection target corresponding to the component “1” in the second row of the square matrix H _h is used. The two first electrodes 25 belonging to the detection electrode blocks 25B (m) and 25B (m + 2) are selected. The first electrode 25 selected as the first detection target is connected to the multiplexer 14B, and an output signal is output. On the other hand, the first electrodes 25 belonging to the detection electrode blocks 25B (m + 1) and 25B (m + 3) not selected as the first detection target are disconnected from the multiplexer 14B, and no output signal is output. Therefore, the first output signal Sh ₁ ⁺ is expressed as Sh ₁ ⁺ = 1 × 1 + 0 × 7 + 1 × 3 + 0 × 2 = 4 from Equation (3).

In the negative sign selection operation Tc ₁ ⁻ , as the second detection target corresponding to the component “−1” in the second row of the square matrix H _h , the two first firsts belonging to the detection electrode blocks 25B (m + 1) and 25B (m + 3). The electrode 25 is selected. The first electrode 25 selected as the second detection target is connected to the multiplexer 14B, and an output signal is output. On the other hand, the first electrode 25 belonging to the detection electrode blocks 25B (m) and 25B (m + 2) not selected as the second detection target is disconnected from the multiplexer 14B, and no output signal is output. The second output signal Sh ₁ ⁻ is Sh ₁ ⁻ = 0 × 1 + 1 × 7 + 0 × 3 + 1 × 2 = 9. Third output signal Sh _{1 ^{is, Sh 1 = Sh 1 + -Sh}} 1 - = 4-9 = -5 is obtained.

Next, as shown in FIG. 12C, in the positive sign selection operation Tc ₂ ⁺ of the third detection operation Tc ₂ , the first detection target corresponding to the component “1” in the third row of the square matrix H _h is used. The two first electrodes 25 belonging to the detection electrode blocks 25B (m) and 25B (m + 1) are selected. The first electrode 25 selected as the first detection target is connected to the multiplexer 14B, and an output signal is output. The first output signal Sh ₂ ⁺ is expressed as Sh ₂ ⁺ = 1 × 1 + 1 × 7 + 0 × 3 + 0 × 2 = 8 from Equation (3).

In the negative sign selection operation Tc ₂ ⁻ , as the second detection target corresponding to the component “−1” in the third row of the square matrix H _h , the two first firsts belonging to the detection electrode blocks 25B (m + 2) and 25B (m + 3). The electrode 25 is selected. The first electrode 25 selected as the second detection target is connected to the multiplexer 14B, and an output signal is output. The second output signal Sh ₂ ⁻ is Sh ₂ ⁻ = 0 × 1 + 0 × 7 + 1 × 3 + 1 × 2 = 5. As for the third output signal Sh ₂ , Sh ₂ = Sh ₂ ⁺ −Sh ₂ ⁻ = 8−5 = 3 is obtained.

Next, as shown in FIG. 12D, in the positive sign selection operation Tc ₃ ⁺ of the fourth detection operation Tc ₃ , the first detection target corresponding to the component “1” in the fourth row of the square matrix H _h is used. The two first electrodes 25 belonging to the detection electrode blocks 25B (m) and 25B (m + 3) are selected. The first electrode 25 selected as the first detection target is connected to the multiplexer 14B, and an output signal is output. The first output signal Sh ₃ ⁺ is expressed as Sh ₃ ⁺ = 1 × 1 + 0 × 7 + 0 × 3 + 1 × 2 = 3 from Equation (3).

In the negative sign selection operation Tc ₃ ⁻ , as the second detection target corresponding to the component “−1” in the fourth row of the square matrix H _h , the two first firsts belonging to the detection electrode blocks 25B (m + 1) and 25B (m + 2). The electrode 25 is selected. The first electrode 25 selected as the second detection target is connected to the multiplexer 14B, and an output signal is output. The second output signal Sh ₃ ⁻ is Sh ₃ ⁻ = 0 × 1 + 1 × 7 + 1 × 3 + 0 × 2 = 10. The third output signal Sh _{3 ^{is, Sh 3 = Sh 3 + -Sh}} 3 - = 3-10 = -7 is obtained.

The signal calculation unit 44 sequentially outputs four third output signals (Sh ₀ , Sh ₁ , Sh ₂ , Sh ₃ ) = (13, −5, ₃ , −7) to the storage unit 47. The signal calculation unit 44 includes four first output signals Sh ₀ ⁺ , Sh ₁ ⁺ , Sh ₂ ⁺ , Sh ₃ ⁺ and four second output signals Sh ₀ ⁻ , Sh ₁ ⁻ , Sh ₂ ⁻ , Sh ₂ . ₃ ⁻ may be stored in the storage unit 47, and the four third output signals Sh ₀ , Sh ₁ , Sh ₂ , Sh ₃ may be calculated after all periods have been detected.

The coordinate extraction unit 45 (see FIG. 2) receives the output signals Sh ₀ , Sh ₁ , Sh ₂ , Sh ₃ calculated by the signal calculation unit 44 from the storage unit 47, and four third output signals (Sh ₀ , Sh _1). , Sh ₂ , Sh ₃ ) = (13, −5, ₃ , −7) is decoded by the following equation (4). The coordinate extraction unit 45 calculates a decoded signal (Si ₀ ^′ , Si ₁ ^′ , Si ₂ ^′ , Si ₃ ^′ ) = (4, 28, 12, 8) based on Expression (4). When the finger touches or approaches, the values of the decoded signals Si ₀ ^′ , Si ₁ ^′ , Si ₂ ^′ , Si ₃ ^′ of the first electrode 25 corresponding to the position change. Thereby, the coordinate extraction unit 45 obtains coordinates where the finger is in contact with or close to the second electrode block BKNB (n) based on the decoded signals Si ₀ ^′ , Si ₁ ^′ , Si ₂ ^′ , Si ₃ ^′. Can do. The coordinate extraction unit 45 may output the coordinates obtained based on the decoded signals Si ₀ ^′ , Si ₁ ^′ , Si ₂ ^′ , Si ₃ ^′ as the detection signal output Vout, or the decoded signal Si ₀ ^′. , Si ₁ ^′ , Si ₂ ^′ , Si ₃ ^′ may be output as the detection signal output Vout.

According to the above code division selection driving, the signal values (Si ₀ , Si ₁ , Si ₂ , Si ₃ ) = (1, 7,...) From the first electrode 25 selected as the first detection target and the second detection target. From the third output signals (Sh ₀ , Sh ₁ , Sh ₂ , Sh ₃ ), which are output signals obtained by integrating 3 and 2), the individual first electrodes 25 are obtained by the decoding process of the coordinate extraction unit 45 according to Expression (4). Signal values (Si ₀ , Si ₁ , Si ₃ ) = decoded signals (Si ₀ ^′ , Si ₁ ^′ ) corresponding to four times the order of the square matrix H _h of ( ₁ , ₇ , ₃ , ₂ ) Si ₂ ^′ , Si ₃ ^′ ) = (4, 28, 12, 8) is obtained. That is, a signal strength four times that of the time division selection drive can be obtained without increasing the voltage of the signal value at each node. Further, since the third output signal Sh _p is obtained from the difference between the first output signal Sh _p ⁺ and the second output signal Sh _p ⁻ , the first output signal Sh _p can be obtained even when noise enters from the outside. _p ⁺ noise component and the second output signal Sh _p ^- noise components are canceled. Thereby, noise tolerance can be improved. Further, according to the present embodiment, the detection operation of the first detection target first electrode 25 selected based on the predetermined code and the first detection target selected based on the predetermined code are not included. The detection operation of the first electrode 25 to be detected is performed in a time-sharing manner in different periods. Thereby, since capacitive coupling between the first electrode 25 as the first detection target and the first electrode 25 as the second detection target can be suppressed, it is possible to suppress a detection error and a decrease in detection sensitivity.

Note that the square matrix H _h shown in Expression (2) is an example, and may be, for example, a square matrix H _h shown in Expression (5) below. In this case, in the positive sign selection operation Tc _p ⁺ (p = 0, 1, 2, 3), three first electrodes 25 to be detected corresponding to the component “1” are selected, and the negative sign selection operation Tc. _{In p} ⁻ (p = 0, 1, 2, 3), one first electrode 25 to be detected corresponding to the component “−1” is selected.

As shown in FIG. 12, the first selection pattern indicating the combination pattern of the first electrodes 25 selected as the first detection target corresponding to the component “1” of the square matrix H _h is the positive code selection operation Tc _p ⁺ ( The four patterns shown in p = 0, 1, 2, 3). That is, the first selection pattern of the first electrodes 25 selected as the first detection target is equal to the number of the first electrodes 25 included in the second electrode block BKNB (n). Further, the second selection pattern indicating the combination pattern of the first electrodes 25 selected as the second detection target corresponding to the component “−1” of the square matrix H _h is equal to the number of the first selection patterns. Second selection pattern is a negative sign selection operation _Tc ^p - a four patterns shown in (p = 0, 1, 2, 3), the number of the first electrode 25 in the second electrode block BKNB (n) Is equal to

The positive code selection operation Tc _p ⁺ and the negative code selection operation Tc _p ⁻ are executed in consecutive periods within the detection periods Pt1 and Pt2 (see FIG. 10), and a set of consecutive positive code selection operations Tc _p ⁺ And the negative sign selection operation Tc _p ⁻ are repeatedly executed. Continuously positive sign selection operation Tc _p ⁺ and executed negative sign selection operation Tc _p ^- out with the difference in magnitude of the noise entering from the outside is suppressed. For this reason, the noise component is canceled by the difference between the first output signal Sh _p ⁺ and the second output signal Sh _p ^−, and noise resistance is improved. The present invention is not limited to this, for example, four after performing successively a positive sign selection operation ^{_{Tc p + (p = 0,1,2,3)}} , 4 single negative sign selection operation _Tc ^p - ^(p = 0 , 1, 2, 3) may be changed as appropriate, for example, continuously. Further, a positive sign selection operation _Tc ^{p +} minus sign selection operation Tc _p ^- and, equal to the number of the first electrode 25 in the second electrode block BKNB (n), respectively, are provided one by 4. That is, the number is the same as the number of row components of the square matrix H _h in Expression (1).

The first detection target first electrode 25 and the second detection target first electrode 25 are supplied with a detection drive signal Vs having the same polarity. In the present embodiment, since the detection operation for the first detection target and the detection operation for the second detection target are performed in a time-sharing manner, the detection drive signal Vs has the polarity of the first polarity drive signal, the first polarity drive signal, The first polarity drive signal may be supplied to the first electrode 25 to be detected, and the second polarity drive signal may be supplied to the first electrode 25 to be detected. . In this case, the third output signal Sh _p = Sh _p ⁺ + Sh _p ⁻ is calculated by calculating the sum of the first output signal Sh _p ⁺ and the second output signal Sh _p ⁻ .

  Here, the relationship between the influence of noise and detection timing will be described with reference to FIGS. FIG. 30 is a schematic diagram for explaining the order of detection of the first electrodes. FIG. 31 is a graph schematically showing the relationship between the sensor number and the correlation function. 30 and 31 are diagrams for showing the relationship between the influence of noise and detection timing in a detection apparatus having the same configuration as that of the present invention, and for explaining how the influence of noise changes. It is a drawing of. As shown in FIG. 30, among the plurality of first electrodes 25, the first electrodes 25 (1), 25 (2),... 25 (5),. Specifically, the detection gate line GCLs (n) is selected, and the detection switching element Trs corresponding to the detection gate line GCLs (n) is turned on. The multiplexer 14B selects the detection data lines SGLs (m), (m + 1), (m + 2), and (m + 3) in order, and the detection drive signal Vs is supplied. Thereby, the detection operation is performed in the order of the first electrodes 25 (1), 25 (2), 25 (3), and 25 (4). Next, the detection gate line GCLs (n + 1) is selected, and the multiplexer 14B sequentially selects the detection data lines SGLs (m), (m + 1), (m + 2), and (m + 3), whereby the first electrode 25 is selected. Detection operations are performed in the order of (5),. Note that the detection order shown in FIG. 30 is the order shown for explanation, and the detection operations of the display device 1 and the detection unit 30 of the present embodiment are not limited to this.

  In FIG. 31, the horizontal axis represents the sensor number, and corresponds to the measurement order of the first electrode 25 described above. The vertical axis represents the correlation function of the output signal of each first electrode 25. When noise enters the detection unit 30, an error occurs in the output signal of each first electrode 25. As shown in FIG. 31, the correlation function of the output signal of each first electrode 25 tends to decrease as the sensor number increases. That is, the error component due to noise increases with time. For example, an error due to the influence of noise is large between the output signal of the first electrode 25 (1) measured first and the output signal of the first electrode 25 (5) measured fifth.

Accordingly, the four first output signals Sh ₀ ⁺ , Sh ₁ ⁺ , Sh ₂ ⁺ , Sh ₃ ⁺ and the four second output signals Sh ₀ ⁻ , Sh ₁ ⁻ , Sh ₂ ⁻ , Sh _{3 shown in FIG.} ^- measurement of ^{_{a, Sh 0 +, Sh 0 -}} , Sh 1 +, Sh 1 -, Sh 2 +, Sh 2 -, Sh 3 +, Sh 3 - it is more preferable to measure in order. In this way, the detection time interval between the first output signal Sh _p ⁺ and the second output signal Sh _p ⁻ (p = 1, 2, 3, 4) is reduced, and the difference in noise components is reduced. Since the third output signal Sh _p is obtained by the difference between the first output signal Sh _p ⁺ and the second output signal Sh _p ⁻ as Sh _p = Sh _p ⁺ −Sh _p ⁻ , the first output signal Sh _p The noise component of ^{+ and} the noise component of the second output signal Sh _p ⁻ are canceled.

Next, with reference to FIG. 13 and FIG. 14, an operation example of the plurality of second electrode blocks BKNB will be described. FIG. 13 is an explanatory diagram illustrating an operation example of the multiplexer and the gate driver according to the first embodiment. FIG. 14 is an explanatory diagram illustrating an operation example of the multiplexer and the gate driver when the second electrode block BKNB to be selected is changed. FIGS. 13 (A) and 13 14 (A) is first detected operation Tc indicates a positive sign selection operation _Tc ^{0 +} _0, and FIG. 13 (B) and FIG. 14 (B) is in the first detection operation Tc ₀ The negative sign selection operation Tc ₀ ⁻ is shown, and FIGS. 13C and 14C show the positive sign selection operation Tc ₁ ⁺ of the second detection operation Tc ₁ . In FIGS. 13 and 14, the detection gate driver 12B (see FIG. 1) is not shown.

  As shown in FIGS. 13A to 13C, the detection scanning signal Vscan supplied from the detection gate driver 12B to the detection gate line GCLs (n) is turned on (high level), and the detection gate The detection switching element Trs connected to the line GCLs (n) is turned on. Each first electrode 25 of the second electrode block BKNB (n) corresponding to the detection gate line GCLs (n) can be selected as a detection target. Detection signals can be output from the first electrodes 25 of the second electrode block BKNB (n) via the detection data lines SGLs (m), SGLs (m + 1), SGLs (m + 2), and SGLs (m + 3). Yes.

  On the other hand, for the detection gate lines GCLs (n + 1), GCLs (n + 2), and GCLs (n + 3), the detection scanning signal Vscans is turned off (low level), and the detection gate lines GCLs (n + 1), GCLs (n + 2), GCLs ( The switching element for detection Trs connected to n + 3) is turned off. The first electrodes 25 of the second electrode blocks BKNB (n + 1), BKNB (n + 2), and BKNB (n + 3) are not selected as detection targets.

With each first electrode 25 of the second electrode block BKNB (n) selected, the positive sign selection operation Tc ₀ ⁺ , the negative sign selection operation Tc ₀ ⁻ , and the second detection operation of the first detection operation Tc ₀ described above. plus sign selection operation of Tc ₁ Tc _{1 +} ^... to be executed in order. The first output signal Sh _p ⁺ and the second output signal Sh _p ⁻ are output from the first electrode 25 of the second electrode block BKNB (n) via the multiplexer 14B. As a result, the position in the first direction D _x (direction along the detection gate line GCLs) of the finger or the like in contact with or in proximity to the first electrode 25 of the second electrode block BKNB (n) is detected. The

  Next, as shown in FIGS. 14A to 14C, the detection scanning signal Vscan supplied from the detection gate driver 12B to the detection gate line GCLs (n + 1) is turned on (high level). The detection switching element Trs connected to the detection gate line GCLs (n + 1) is turned on. Each first electrode 25 of the second electrode block BKNB (n + 1) corresponding to the detection gate line GCLs (n + 1) can be selected as a detection target.

  On the other hand, for the detection gate lines GCLs (n), GCLs (n + 2), GCLs (n + 3), the detection scanning signal Vscans is turned off (low level), and the detection gate lines GCLs (n), GCLs (n + 2), GCLs ( The switching element for detection Trs connected to n + 3) is turned off. The first electrodes 25 of the second electrode blocks BKNB (n), BKNB (n + 2), and BKNB (n + 3) are not selected as detection targets.

With each first electrode 25 of the second electrode block BKNB (n + 1) selected, the positive sign selection operation Tc ₀ ⁺ , the negative sign selection operation Tc ₀ ⁻ , and the second detection operation of the first detection operation Tc ₀ described above. plus sign selection operation of Tc ₁ Tc _{1 +} ^... to be executed in order. The first output signal Sh _p ⁺ and the second output signal Sh _p ⁻ are output from the first electrode 25 of the second electrode block BKNB (n + 1) via the multiplexer 14B. Thus, in the region overlapping with the first electrode 25 of the second electrode block BKNB (n + 1), the position of the first direction D _x such as a finger in contact with or close proximity is detected.

In this way, the detection gate driver 12B sequentially supplies the detection scanning signal Vscans to the detection gate lines GCLs (n), GCLs (n + 1), GCLs (n + 2), and GCLs (n + 3). The second electrode blocks BKNB (n), BKNB (n + 1), BKNB (n + 2), and BKNB (n + 3) are selected in order. Position in the first direction _{D x} is the decoded signal of a code division selected driving described above ^{_{(Si 0 ', Si 1'}} , Si 2 ', Si 3') can be calculated based on. The position in the second direction D _y (the direction along the detection data line SGLs) is the detection result of each of the second electrode blocks BKNB (n), BKNB (n + 1), BKNB (n + 2), and BKNB (n + 3). It can be calculated from Thereby, the two-dimensional coordinate of the position where a finger etc. contact or adjoin is obtained.

As shown in FIG. 13 and FIG. 14, the first electrode 25 arranged in the second direction D _y is connected to the common detection data lines SGLS, not limited to this, a separate detection A data line may be connected.

(Second Embodiment)
FIG. 15 is a block diagram illustrating a configuration example of the signal processing unit according to the second embodiment. In the following embodiments and drawings, elements similar to those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate. The signal processing unit 40A of the present embodiment has two detection signal amplification units 42A and 42B and two A / D conversion units 43A and 43B. The detection signal amplification unit 42A receives the first output signal from the detection unit 30, and amplifies the first output signal. The A / D converter 43A samples each analog signal output from the detection signal amplifier 42A and converts it into a digital signal. The digital signal output from the A / D conversion unit 43A is stored in the storage unit 47. The detection signal amplification unit 42B receives the second output signal from the detection unit 30, and amplifies the second output signal. The A / D converter 43B samples each analog signal output from the detection signal amplifier 42B and converts it into a digital signal. The digital signal output from the A / D conversion unit 43B is stored in the storage unit 47.

  Based on the control signal supplied from the control unit 11, the detection timing control unit 46 controls the A / D conversion units 43A and 43B, the signal calculation unit 44, and the coordinate extraction unit 45 to operate in synchronization. To do.

  The signal calculation unit 44 receives information on a signal obtained by digitally converting the first output signal and information on a signal obtained by digitally converting the second output signal from the storage unit 47, and performs calculation processing. The calculation result of the signal calculation unit 44 is stored in the storage unit 47. The coordinate extraction unit 45 receives information from the storage unit 47, performs the above-described decoding process, and obtains touch panel coordinates.

  FIG. 16 is a circuit diagram illustrating a configuration example of the selective connection unit according to the second embodiment. In this embodiment, a selective connection portion 14C is provided instead of the multiplexer 14B as the “selective connection portion” shown in FIG. In FIG. 16, the switch elements SW5 and xSW5, the wirings L1, L2, and L3, the selection signal generation unit 16, and the drive signal generation unit 14A in FIG. 11 are omitted. The selective connection unit 14C includes a first switching element Tr1, a second switching element Tr2, and an inverting unit 85. A first switching element Tr1 and a second switching element Tr2 are connected to each of the detection data lines SGLs. The detection data line SGLs can be connected to the first detector DET1 via the first switching element Tr1, and can be connected to the second detector DET2 via the second switching element Tr2. The first switching element Tr1 and the second switching element Tr2 may be n-channel MOS type TFT elements. The first detector DET1 and the second detector DET2 correspond to the voltage detector DET in the self-capacitance type detection principle described above. The first detector DET1 may be included in the detection signal amplification unit 42A (see FIG. 15), and the second detector DET2 may be included in the detection signal amplification unit 42B (see FIG. 15).

  The selective connection unit 14C, switch elements SW5 and xSW5 (not shown), wirings L1, L2, and L3 (not shown), a selection signal generation unit 16 (not shown), a drive signal generation unit 14A (not shown), a counter 17, and a decoder 18 are illustrated in FIG. It may be included in the first electrode driver 14 and the controller 11 shown. For example, the first electrode driver 14 functions as a selection connection unit 14C, switch elements SW5 and xSW5 (not shown), and wirings L1, L2, and L3 (not shown), and the control unit 11 generates a selection signal generation unit 16 and a drive signal generation (not shown). The unit 14A, the counter 17, and the decoder 18 may function.

The gate of the first switching element Tr1 is connected to the decoder 18. The gate of the second switching element Tr2 is connected to the decoder 18 via the inversion unit 85. The decoder 18 generates a selection signal for selecting the first electrode 25 to be detected based on a predetermined code, and outputs the selection signal to the first switching element Tr1 and the second switching element Tr2. For example, the decoder 18 generates a signal that is turned on (high level) corresponding to the component “1” of the square matrix H _h and turned off (low level) corresponding to the component “−1”. Based on the timing control signal received from the counter 17, the decoder 18 outputs a selection signal corresponding to the component for one row of the square matrix H _h . Here, the wiring selectively connected to the detection data lines SGLs by the switching element Tr1 corresponds to the first output signal line. The first output signal line is connected to the first detector DET1. A first output signal, which is an integrated value of detection signals from the detection electrodes selected by the first selection signal, is transmitted to the first output signal line. Further, the wiring selectively connected to the detection data line SGLs by the switching element Tr2 corresponds to the second output signal line. The second output signal line is connected to the second detector DET2. The second output signal line transmits a second output signal that is an integrated value of the detection signals from the detection electrodes selected by the second selection signal.

  When a high-level selection signal is output from the decoder 18, the first switching element Tr1 is turned on, and the detection data line SGLs and the first detector DET1 are connected. On the other hand, the second switching element Tr2 is supplied with a low-level selection signal obtained by inverting the high-level selection signal by the inverting unit 85. As a result, the second switching element Tr2 is turned off, and the connection between the detection data line SGLs and the second detector DET2 is released.

  When a low-level selection signal is output from the decoder 18, the first switching element Tr1 is turned off, and the connection between the detection data line SGLs and the first detector DET1 is released. On the other hand, the second switching element Tr2 is supplied with a high-level selection signal obtained by inverting the low-level selection signal by the inverting unit 85. As a result, the second switching element Tr2 is turned on, and the detection data line SGLs and the second detector DET2 are connected.

In the present embodiment, the selection connection unit 14C includes the first switching element Tr1, the second switching element Tr2, and the inversion unit 85, and thus the first connection element 14C for selecting the first electrode 25 to be detected. The first selection signal and the second selection signal obtained by inverting the first selection signal are simultaneously supplied to the detection data lines SGLs. Moreover, since it has a first detector DET1 and a second detector DET2, the output signal from the first electrode 25 corresponding to the components of the square matrix H _h "1", components of the square matrix H _h " The output signal from the first electrode 25 corresponding to “−1” can be detected simultaneously.

  In the present embodiment, the selective connection unit 14C includes the inversion unit 85. However, a CMOS (Complementary MOS) circuit configuration using n-channel and p-channel MOS TFT elements may be used.

FIG. 17 is an explanatory diagram illustrating an operation example of the selective connection unit and the gate driver according to the second embodiment. 17A shows the first detection operation Tc ₀ , FIG. 17B shows the second detection operation Tc ₁ , FIG. 17C shows the third detection operation Tc ₂ , and FIG. shows a fourth detection operation Tc _3. In each operation of FIG. 17A to FIG. 17D, the detection gate driver 12B supplies the detection scanning signal Vscans to the detection gate lines GCLs (n), and the second electrode block BKNB (n) is the detection target. As selected.

In the first detection operation Tc ₀ shown in FIG. 17A, the decoder 18 (see FIG. 16) outputs the first selection signal corresponding to the component “1” in the first row of the square matrix H _h to the selection connection unit 14C. To do. As a result, the detection data lines SGLs (m), SGLs (m + 1), SGLs (m + 2), and SGLs (m + 3) are connected to the first detector DET1 via the selection connection unit 14C. The four first electrodes 25 connected to the detection data lines SGLs (m), SGLs (m + 1), SGLs (m + 2), and SGLs (m + 3) are selected as the first detection targets. On the other hand, since the first row of the square matrix H _h does not include the component “−1”, the detection data lines SGLs (m), SGLs (m + 1), and SGLs are generated by the second selection signal obtained by inverting the first selection signal. (M + 2) and SGLs (m + 3) are disconnected from the second detector DET2.

In the first detection operation Tc _0, the first output signal _Sh ^{0 +} is output to the first detector DET1. The first output signal Sh ₀ ⁺ is a signal obtained by integrating the detection signals of the four first electrodes 25 of the second electrode block BKNB (n). On the other hand, the second output signal Sh ₀ ⁻ is not output to the second detector DET2. The first output signal Sh ₀ ⁺ and the second output signal Sh ₀ ⁻ are stored in the storage unit 47 (see FIG. 14).

In the second detection operation Tc ₁ shown in FIG. 17B, the decoder 18 (see FIG. 16) outputs the first selection signal corresponding to the component “1” in the second row of the square matrix H _h to the selection connection unit 14C. To do. Thereby, the detection data lines SGLs (m), SGLs (m + 2) are connected to the first detector DET1 via the selective connection unit 14C. The first electrode 25 connected to the detection data lines SGLs (m) and SGLs (m + 2) is selected as the first detection target. At the same time, the detection data lines SGLs (m + 1) and SGLs (m + 3) correspond to the second selection signal corresponding to the component “−1” in the second row of the square matrix H _h by the second selection signal. Connected to detector DET2. The first electrode 25 connected to the detection data lines SGLs (m + 1) and SGLs (m + 3) is selected as the second detection target.

In the second detection operation Tc _1, the first output signal _Sh ^{1 +} is output to the first detector DET1. The first output signal Sh ₁ ⁺ is a signal obtained by integrating the detection signals of the two first electrodes 25 of the first detection target among the four first electrodes 25 of the second electrode block BKNB (n). On the other hand, the second output signal Sh ₁ ⁻ is output to the second detector DET2. The second output signal Sh ₁ ⁻ is a signal obtained by integrating the detection signals of the two first electrodes 25 to be detected among the four first electrodes 25 of the second electrode block BKNB (n). The first output signal Sh ₁ ⁺ and the second output signal Sh ₁ ⁻ are stored in the storage unit 47 (see FIG. 14).

In the third detection operation Tc ₂ shown in FIG. 17 (C), the decoder 18 (see FIG. 16) output a first selection signal corresponding to the component in the third row of the square matrix _{H h} "1" to the selected connection portion 14C To do. As a result, the first electrode 25 as the first detection target and the first electrode 25 as the second detection target are simultaneously selected. Further, in the fourth detection operation Tc ₃ shown in FIG. 17 (D), the decoder 18 (see FIG. 16) is the first selection signal to select connection section 14C corresponding to components of the fourth row of the square matrix _{H h} "1" Output to. As a result, the first electrode 25 as the first detection target and the first electrode 25 as the second detection target are simultaneously selected.

Next, the detection gate driver 12B is sequentially different second electrode block BKNB be selected as the detection target, the fourth detection operation Tc ₃ performs a first detection operation Tc ₀ every second electrode block BKNB.

As described above, in this embodiment, since the first detector DET1 and the second detector DET2 are included, the positive code selection operation corresponding to the component “1” of the square matrix H _h is performed. Tc _p ⁺ (p = 0, 1, 2, 3) (see FIG. 12) and the negative sign selection operation Tc _p ⁻ (p = 0, 1, 2, 3) corresponding to the component “−1” of the square matrix H _h 3) (see FIG. 12) can be executed simultaneously. An output signal from the first electrode 25 corresponding to the components of the square matrix H _h "+1", the output signal from the first electrode 25 corresponding to the components of the square matrix H _h "-1", but can be detected at the same time It has become. Therefore, the time required for detection can be shortened. In this case, the first detection target first electrode 25 and the second detection target first electrode 25 are supplied with the detection drive signal Vs having the same polarity. Thereby, capacitive coupling between the first electrode 25 as the first detection target and the first electrode 25 as the second detection target is suppressed, and good detection sensitivity is obtained.

  FIG. 18 is a circuit diagram illustrating another example of the selective connection unit. In this embodiment, a selective connection portion 14Ca is provided instead of the multiplexer 14B as the “selective connection portion” shown in FIG. In FIG. 18, the switch elements SW5 and xSW5, the wirings L1, L2, and L3, and the selection signal generation unit 16 in FIG. 11 are not shown. The selective connection portion 14Ca of this modification has common wirings LC1-LC8. One end side of the common lines LC1 to LC8 is connected to the shift register 19. In this modification, one end sides of the common wirings LC1 and LC2 are connected, one end sides of the common wirings LC3 and LC4 are connected, one end sides of the common wirings LC5 and LC6 are connected, and the common wirings LC7 and LC8 are connected. One end sides are connected to each other. The other ends of the common lines LC1, LC3, LC5, and LC7 are connected to the first detector DET1. The other ends of the common lines LC2, LC4, LC6, and LC8 are connected to the second detector DET2.

The common lines LC1, LC3, LC5, and LC7 are connected to the detection data line SGLs corresponding to the component “1” of each row of the square matrix H _h . Specifically, the common line LC1 corresponds to the component “1” in the first row of the square matrix H _h , and the detection data lines SGLs (m), SGLs (m + 1), SGLs (m + 2), and SGLs (m + 3). It is connected to the. Common wiring LC3 is corresponding to the second row of components "1" of the square matrix _{H h,} detection data lines SGLs (m), is connected to the SGLs (m + 2). Common wiring LC5 is corresponding to component "1" in the third line of the square matrix _{H h,} detection data lines SGLs (m), is connected to the SGLs (m + 1). Common wiring LC7 is in correspondence with the components of the fourth row of the square matrix _{H h} "1", detection data lines SGLS (m), is connected to the SGLs (m + 3).

On the other hand, the common lines LC2, LC4, LC6, and LC8 are connected to the detection data line SGLs corresponding to the component “−1” of each row of the square matrix H _h . Specifically, the common wiring LC2 corresponds to the component “−1” in the first row of the square matrix H _h , and the detection data lines SGLs (m), SGLs (m + 1), SGLs (m + 2), and SGLs (m + 3). ) Is not connected. Common wiring LC4 is to correspond to the component "-1" in the second line of the square matrix _{H h,} detection data lines SGLs (m + 1), is connected to the SGLs (m + 3). The common line LC6 is connected to the detection data lines SGLs (m + 2) and SGLs (m + 3) corresponding to the component “−1” in the third row of the square matrix H _h . Common wiring LC8 will correspond to components "-1" in the fourth line of square matrix _{H h,} detection data lines SGLs (m + 1), is connected to the SGLs (m + 2).

Based on the timing control signal from the counter 17, the shift register 19 sequentially supplies the detection drive signal Vs supplied from the drive signal generation unit 14A to the common lines LC1-LC8. Since the common lines LC1-LC8 are connected to the detection data lines SGLs corresponding to the component “1” or the component “−1” of the square matrix H _h , the detection drive signal Vs is supplied to the common lines LC1-LC8. Thus, the first detection operation Tc ₀ to the fourth detection operation Tc ₃ described above are executed. For example, the common line LC1 corresponds to the positive sign selection operation Tc ₀ ⁺ of the first detection operation Tc ₀ . The common line LC2 corresponds to the negative sign selection operation Tc ₀ ⁻ of the first detection operation Tc ₀ . Since the common wiring LC1 and the common wiring LC2 are connected at one end side, the detection drive signal Vs is supplied at the same time, and the positive sign selection operation Tc ₀ ⁺ and the negative sign selection operation Tc ₀ ⁻ are simultaneously performed.

  The selection connection unit 14Ca, switch elements SW5 and xSW5 (not shown), wirings L1, L2, and L3 (not shown), the selection signal generation unit 16, the drive signal generation unit 14A, the counter 17, and the shift register 19 (not shown) are illustrated in FIG. It may be included in the first electrode driver 14 and the control unit 11. For example, the first electrode driver 14 functions as a selection connection unit 14Ca, switch elements SW5, xSW5 (not shown), wirings L1, L2, L3 (not shown), and a shift register 19, and the control unit 11 selects a selection signal generation unit 16, not shown. The drive signal generation unit 14 </ b> A and the counter 17 may function.

(Third embodiment)
In the embodiment described above, by performing the code division selection drive for the second electrode block BKNB, although an example of detecting the touch input position in the first direction D _x, is applied to the detection of the second direction D _y Also good. FIG. 19 is an explanatory diagram for explaining another example of the selection pattern of the first electrode selected as the detection target according to the third embodiment. FIG. 19A shows the positive sign selection operation Td ₀ ⁺ and the negative sign selection operation Td ₀ ⁻ of the first detection operation Td ₀ . FIG. 19B shows a positive sign selection operation Td ₁ ⁺ and a negative sign selection operation Td ₁ ⁻ of the second detection operation Td ₁ . FIG. 19C shows a positive sign selection operation Td ₂ ⁺ and a negative sign selection operation Td ₂ ⁻ of the third detection operation Td ₂ . FIG. 19D shows a positive sign selection operation Td ₃ ⁺ and a negative sign selection operation Td ₃ ⁻ of the fourth detection operation Td ₃ .

In FIG. 19, one detection electrode block 25B (m) will be described. The detection electrode block 25B (m) includes four first electrodes 25 arranged in the column direction (second direction D _y ). The four first electrodes 25 are selected electrode blocks 25A (n), 25A ( n + 1), 25A (n + 2), and 25A (n + 3). The four first electrodes 25 are connected to a common detection data line SGLs (m) (see FIG. 8). In the detection unit 30 of the present embodiment, the detection gate driver 12B selects the first electrode 25 to be detected from the detection electrode block 25B (m) based on a predetermined code. A detection drive signal Vs is supplied to the selected first electrode 25, and a detection signal is output from each first electrode 25 based on the capacitance change of the first electrode 25. Similarly to the above-described equation (1), an output signal Sv _r (r = 0, 1, 2, 3) obtained by integrating the detection signals of the first electrodes 25 is output. In the present embodiment, the detection data driver 12B is a selective connection unit that selectively connects the detection electrodes included in one detection electrode block 25B (m) and the common detection data line SGLs (m). The common detection data line SGLs (m) is an output signal line.

The predetermined code is defined by, for example, a square matrix H _v in the following equation (6), and is the same as the square matrix H _h shown in the equation (1). The square matrix _Hv is not limited to this, and may be another Hadamard matrix. Order square matrix _{H v,} the number of first electrodes 25 included in the detection electrode block 25B (m), i.e., a 4 is the number of four selection electrode block 25A. In the present embodiment, the detection electrode block 25B (m) including the four first electrodes 25 will be described. However, the present invention is not limited to this, and the number of the first electrodes 25 arranged in the column direction is two, three, or There may be five or more. In this case, the order of the square matrix H _v is changed in accordance with the number of the first electrode 25 included in the detection electrode block 25B (m).

In FIG. 19A to FIG. 19D, code division is performed by dividing into four detection operations of a first detection operation Td ₀ , a second detection operation Td ₁ , a third detection operation Td _2, and a fourth detection operation Td _3. An example of selection driving will be described. In the first detection operation Td ₀ shown in FIG. 19 (A), the first electrode 25 in response to the selection signal corresponding to the first row of the square matrix H _v is selected. In the second detection operation Td ₁ shown in FIG. 19 (B), the first electrode 25 in response to the selection signal corresponding to the second row of the square matrix H _v is selected. In the third detection operation Td ₂ shown in FIG. 19 (C), the first electrode 25 in response to the selection signal corresponding to the third row of the square matrix H _v is selected. In the fourth detection operation Td ₃ shown in FIG. 19 (D), the first electrode 25 in response to the selection signal corresponding to the fourth row of the square matrix H _v is selected.

The first detection operation Td ₀ , the second detection operation Td ₁ , the third detection operation Td _2, and the fourth detection operation Td ₃ are respectively positive sign selection operations Td ₀ ⁺ , Td ₁ ⁺ , Td ₂ ⁺ , Td ₃ ⁺ Negative sign selection operations Td ₀ ⁻ , Td ₁ ⁻ , Td ₂ ⁻ and Td ₃ ⁻ . Plus sign selection operation ^{_{Td 0 +, Td 1 +,}} Td 2 +, the _Td ^{3 +,} in response to the first selection signal corresponding to the component of the square matrix _{H v} "1", of the detecting electrode block 25B (m) The first electrode 25 that is the first detection target is selected. In FIG. 19, the selected first electrode 25 is indicated by hatching. A first output signal Sv _r ⁺ (r = 0, 1, 2, 3) is output from the first electrode 25 to be detected through the multiplexer 14B. Here, the first output signal Sv _r ⁺ is a signal in which the detection signals of the first electrodes 25 to be detected included in the detection electrode block 25B (m) are integrated.

Negative sign selection operation ^{_{Td 0 -, Td 1 -,}} Td 2 -, Td 3 - In, in response to the second selection signal corresponding to the component of the square matrix _{H v} "-1", the detection electrode block 25B of the (m) Among these, the first electrode 25 of the second detection target that is not included in the first detection target is selected. The second output signal Sv _r ⁻ (r = 0, 1, 2, 3) is output from the first electrode 25 to be detected through the multiplexer 14B. Here, the second output signal Sv _r ⁻ is a signal obtained by integrating the detection signals of the first electrodes 25 to be detected included in the detection electrode block 25B (m). In the present embodiment, the plus sign selection operation Td _r ⁺ (r = 0, 1, 2, 3) and the minus sign selection operation Td _r ⁻ (r = 0, 1, 2, 3) are executed in a time division manner. The

The signal calculation unit 44 (see FIG. 2) of the signal processing unit 40 calculates the difference between the first output signal Sv _p ⁺ and the second output signal Sv _p ⁻ , whereby the third output signal Sv _r = Sv _r ^+. -Sv _r ^- is calculated. Signal computing unit 44 outputs the third output signal Sv _r in the storage unit 47, and temporarily stores the third output signal Sv _r. The first output signal Sh _p ⁺ and the second output signal Sh _p ⁻ are the basics of the self-capacitance touch detection described above when the first electrode group selected according to the selection signal is the electrode E1. This corresponds to the detection signal Vdet in principle.

If the order of the square matrix _{H v} is 4, similarly to the equation (3) described above, from one detection electrode blocks 25B (m), the four output signals _{(Sv 0, Sv 1, Sv} 2, Sv 3) can get. In this case, the four first output signals Sv ₀ ⁺ , Sv ₁ ⁺ , Sv ₂ ⁺ , Sv ₃ ⁺ and the four second output signals Sv ₀ ⁻ , Sv ₁ ⁻ , Sv ₂ ⁻ , Sv ₃ ⁻ Three output signals (Sv ₀ , Sv ₁ , Sv ₂ , Sv ₃ ) are respectively obtained.

As shown in FIG. 19A, in the positive sign selection operation Td ₀ ^{+ of} the first detection operation Td ₀ , four detection targets corresponding to the component “1” in the first row of the square matrix H _v are four. The first electrode 25 is selected. Specifically, the detection gate driver 12B supplies the detection scanning signal Vscans to the detection gate lines GCLs corresponding to the first electrodes 25 to be detected. As a result, the detection switching element Trs is turned on, and detection based on the basic principle of the self-capacitance method is executed by the first electrode 25 to be detected. As the first output signal Sv ₀ ^+, a signal in which the detection signals of the four first electrodes 25 are integrated is output.

In the negative sign selection operation Td ₀ ^{− of} the first detection operation Td ₀ , since the component “−1” in the first row of the square matrix H _v does not exist, the first detection target corresponding to the component “−1” is the first. The electrode 25 is not selected. Therefore, the second output signal Sv ₀ ⁻ is Sv ₀ ⁻ = 0. From the difference between the first output signal Sv ₀ ⁺ and the second output signal Sv ₀ ⁻ , the third output signal Sv ₀ = Sv ₀ ⁺ −Sv ₀ ⁻ is calculated.

Next, as illustrated in FIG. 19B, in the positive sign selection operation Td ₁ ^{+ of} the second detection operation Td ₁ , the first detection target corresponding to the component “1” in the second row of the square matrix H _v is used. The two first electrodes 25 belonging to the selection electrode blocks 25A (n) and 25A (n + 2) are selected. The first output signal Sv ₁ ⁺ is output from the first electrode 25 selected as the first detection target.

Second negative sign selection operation Td detecting operation Td _{1 1} ^- So, as a second detection target corresponding to the second row of the components of the square matrix _{H v} "-1", the selection electrode block 25A (n + 1), 25A (n + 3 Two first electrodes 25 belonging to) are selected. The second output signal Sv ₁ ⁻ is output from the first electrode 25 selected as the second detection target. From the difference between the first output signal Sv ₁ ⁺ and the second output signal Sv ₁ ⁻ , the third output signal Sv ₁ = Sv ₁ ⁺ −Sv ₁ ⁻ is calculated.

Next, as shown in FIG. 19C, in the positive sign selection operation Td ₂ ^{+ of} the third detection operation Td ₂ , the first detection target corresponding to the component “1” in the third row of the square matrix H _v is used. The two first electrodes 25 belonging to the selection electrode blocks 25A (n) and 25A (n + 1) are selected. The first output signal Sv ₂ ⁺ is output from the first electrode 25 selected as the first detection target.

Negative sign selection operation Td ₂ of the third detection operation Td ₂ ^- In, as a second detection object corresponding to the component of the third row of the square matrix _{H v} "-1", the selection electrode block 25A (n + 2), 25A (n + 3 Two first electrodes 25 belonging to) are selected. The second output signal Sv ₂ ⁻ is output from the first electrode 25 selected as the second detection target. From the difference between the first output signal Sv ₂ ⁺ and the second output signal Sv ₂ ⁻ , a third output signal Sv ₂ = Sv ₂ ⁺ −Sv ₂ ⁻ is calculated.

Next, as illustrated in FIG. 19D, in the positive sign selection operation Td ₃ ^{+ of} the fourth detection operation Td ₃ , the first detection target corresponding to the component “1” in the fourth row of the square matrix H _v is used. The two first electrodes 25 belonging to the selection electrode blocks 25A (n) and 25A (n + 3) are selected. The first output signal Sv ₃ ⁺ is output from the first electrode 25 selected as the first detection target.

In the negative sign selection operation Td ₃ ^{− of} the fourth detection operation Td ₃ , as the second detection target corresponding to the component “−1” in the fourth row of the square matrix H _v , the selection electrode blocks 25A (n + 1) and 25A (n + 2 Two first electrodes 25 belonging to) are selected. The second output signal Sv ₃ ⁻ is output from the first electrode 25 selected as the second detection target. From the difference between the first output signal Sv ₃ ⁺ and the second output signal Sv ₃ ⁻ , the third output signal Sv ₃ = Sv ₃ ⁺ −Sv ₃ ⁻ is calculated.

The signal calculation unit 44 sequentially outputs four output signals Sv ₀ , Sv ₁ , Sv ₂ , Sv ₃ to the storage unit 47. The coordinate extraction unit 45 (see FIG. 2) receives the output signals Sv ₀ , Sv ₁ , Sv ₂ , Sv ₃ calculated by the signal calculation unit 44 from the storage unit 47 and performs the decoding process in the same manner as the above-described equation (4). Run. The coordinate extraction unit 45 can acquire a detection signal of each detection electrode included in the detection electrode block 25B (m) by executing a decoding process. The coordinate extraction unit 45 can obtain the coordinates of the detection electrode block 25B (m) where the finger is in contact or close by calculating the decoded signal.

As described above, it is possible to detect a touch input position in the second direction D _y by code division selection drive. Also in the present embodiment, decoding is performed from an output signal obtained by integrating the detection signals of the first electrodes 25, so that the voltage of the signal value at each node is not increased, and four times that of the time division selection drive. Signal strength will be obtained.

In the present embodiment, the four first electrodes 25 of the detection electrode block 25B (m) are connected to a common detection data line SGLs (m) (see FIG. 8). Therefore, the positive code selection operation Td _r ⁺ and the negative code selection operation Td _r ⁻ are executed in a time division manner. Thereby, the capacitive coupling between the first electrodes 25 can be suppressed, and the detection sensitivity can be improved. When one data line is connected to each of the four first electrodes 25 of the detection electrode block 25B (m), the positive sign selection operation Td _r ⁺ and the negative sign selection operation Td _r ⁻ are performed simultaneously. May be executed.

(Fourth embodiment)
Next, with reference to FIG. 20 to FIG. 27, an example of operation when code division selection driving is applied to detection of touch input positions in the first direction D _x and the second direction D _y will be described. FIG. 20 is an explanatory diagram for explaining an example of a selection pattern of the first electrode selected as a detection target in the first detection operation and the second detection operation according to the fourth embodiment. FIG. 21 is an explanatory diagram for describing an example of a selection pattern of the first electrode selected as a detection target in the third detection operation and the fourth detection operation. FIG. 22 is an explanatory diagram for explaining an example of a selection pattern of the first electrode selected as a detection target in the fifth detection operation and the sixth detection operation. FIG. 23 is an explanatory diagram for explaining an example of a selection pattern of the first electrode selected as a detection target in the seventh detection operation and the eighth detection operation. FIG. 24 is an explanatory diagram for describing an example of a selection pattern of the first electrode selected as a detection target in the ninth detection operation and the tenth detection operation. FIG. 25 is an explanatory diagram for explaining an example of a selection pattern of the first electrode selected as a detection target in the eleventh detection operation and the twelfth detection operation. FIG. 26 is an explanatory diagram for describing an example of a selection pattern of the first electrode selected as a detection target in the thirteenth detection operation and the fourteenth detection operation. FIG. 27 is an explanatory diagram for explaining an example of a selection pattern of the first electrode selected as a detection target in the fifteenth detection operation and the sixteenth detection operation. In the present embodiment, the detection gate driver 12B, and a multiplexer 14B is, corresponds to the first direction D _x and the second direction D _y to arranged detection electrodes block selection connecting unit that selects the first electrode, and a multiplexer 14B The wiring connecting the detectors (first detector and second detector) corresponds to the output signal line. The output signal line transmits an output signal obtained by integrating the detection signals of the first electrodes selected by the detection gate driver 12B and the multiplexer 14B.

  20 to 27, the code division selection drive is executed by combining the selection pattern of the first electrode shown in FIG. 12 and the selection pattern of the first electrode shown in FIG.

20A shows the positive sign selection operation Te ₀₀ ⁺ of the first detection operation, FIG. 20B shows the negative sign selection operation Te ₀₀ ⁻ of the first detection operation, and FIG. FIG. 20D shows the positive sign selection operation Te ₀₁ ⁺ of the second detection operation, and FIG. 20D shows the negative sign selection operation Te ₀₁ ⁻ of the second detection operation. In FIG. 20A, the code division selection drive in the second direction D _y corresponds to the component “1” in the first row of the square matrix H _v , and the second electrode blocks BKNB (n), BKNB (n + 1) , BKNB (n + 2), first electrodes 25 belonging to BKNB (n + 3) is selected as the first electrode 25 of the first detection target square matrix _{H v.} That is, the first electrode 25 connected to the detection gate lines GCLs (n), GCLs (n + 1), GCLs (n + 2), and GCLs (n + 3) is selected.

Further, in FIG. 20 (A), code division selectively driven in the first direction D _x is a positive sign selection operation and the negative sign selection operation are performed simultaneously. The first electrode 25 belonging to the detection electrode blocks 25B (m), 25B (m + 1), 25B (m + 2), and 25B (m + 3) corresponding to the component “1” in the first row of the square matrix H _h is a square matrix. It is selected as the first electrode 25 of the first detection target H _h, are connected to the first detector DET1 via a multiplexer 14B. Since the component “−1” in the first row of the square matrix H _h does not exist, the first electrode 25 is not selected as the second detection target of the square matrix H _h corresponding to the component “−1”.

A signal obtained by integrating the detection signals of the first electrodes 25 is output as a first output signal Svh ₀₀ ⁺⁺ . The second output signal Svh ₀₀ ^{+ −} is Svh ₀₀ ^{+ −} = 0. From these differences, the output signal Svh ₀₀ ⁺ = Svh ₀₀ ⁺⁺ −Svh ₀₀ ^{+ −} is calculated.

In FIG. 20B, the code division selection drive in the second direction D _y does not include the component “−1” in the first row of the square matrix H _v , so the second electrode blocks BKNB (n), BKNB (n + 1) ), BKNB (n + 2) , first electrodes 25 belonging to BKNB (n + 3) is not selected as the second detection target square matrix _{H v} corresponding to component "-1".

The first output signal Svh ₀₀ ^{− +} and the second output signal Svh ₀₀ ⁻⁻ are Svh ₀₀ ^{− +} = Svh ₀₀ ⁻⁻ = 0. From these differences, the output signal Svh ₀₀ ⁻ = Svh ₀₀ ^{− +} −Svh ₀₀ ⁻⁻ is calculated. From the difference between the output signal Svh ₀₀ ⁺ and the output signal Svh ₀₀ ⁻ , the third output signal Svh ₀₀ in the first detection operation is calculated.

In FIG. 20C and FIG. _20D , the code division selection drive in the second direction D _{y is} the same selection as in FIG. 20A and FIG. 20B, respectively. In the code division selection driving in the first direction D _x , the first electrodes 25 of the detection electrode blocks 25B (m) and 25B (m + 2) are square matrices corresponding to the component “1” in the second row of the square matrix H _h. It is selected as the first detection target H _h. In correspondence to the component "-1" in the second line of the square matrix _{H h,} selection detection electrode block 25B (m + 1), the first electrode 25 of the 25B (m + 3) as the second detection target square matrix _{H h} Is done. In the positive sign selection operation Te ₀₁ ^{+ of} the second detection operation shown in FIG. 20C, the output signal Svh ₀₁ ⁺ = Svh ₀₁ ⁺⁺ −Svh ₀₁ ^{+ −} is calculated. In the negative sign selection operation Te ₀₁ ^{− of} the second detection operation shown in FIG. 20D, the output signal Svh ₀₁ ⁻ = Svh ₀₁ ^{− +} −Svh ₀₁ ⁻⁻ is calculated. From the difference between the output signal Svh ₀₁ ⁺ and the output signal Svh ₀₁ ⁻ , the third output signal Svh ₀₁ in the second detection operation is calculated.

FIG. 21A shows the positive sign selection operation Te ₀₂ ⁺ of the third detection operation, FIG. 21B shows the negative sign selection operation Te ₀₂ ⁻ of the third detection operation, and FIG. FIG. 21D shows the positive sign selection operation Te ₀₃ ⁺ of the fourth detection operation, and FIG. 21D shows the negative sign selection operation Te ₀₃ ⁻ of the fourth detection operation. In FIGS. 21A to _21D , the code division selection drive in the second direction D _y is the same as that in FIGS. 20A to 20D. That is, in response to the first row of the components of the square matrix H _v "1", the first electrode 25 of the second detection target of the first first electrode 25 and the square matrix H _v of the detected square matrix H _v is Selected.

In FIGS. 21A and 21B, the code division selection drive in the first direction D _x corresponds to the component “1” in the third row of the square matrix H _h , and the detection electrode block 25B (m). the first electrode 25 of the 25B (m + 1) is selected as the first detection target square matrix _{H h.} In correspondence to the component "-1" in the third line of the square matrix _{H h,} selection detection electrode block 25B (m + 2), first electrode 25 of the 25B (m + 3) as the second detection target square matrix _{H h} Is done. In the positive sign selection operation Te ₀₂ ^{+ of} the third detection operation shown in FIG. 21A, the output signal Svh ₀₂ ⁺ = Svh ₀₂ ⁺⁺ −Svh ₀₂ ^{+ −} is calculated. In the negative sign selection operation Te ₀₂ ^{− of} the third detection operation shown in FIG. 21B, the output signal Svh ₀₂ ⁻ = Svh ₀₂ ^{− +} −Svh ₀₂ ⁻⁻ is calculated. From the difference between the output signal Svh ₀₂ ⁺ and the output signal Svh ₀₂ ⁻ , the third output signal Svh ₀₂ in the third detection operation is calculated.

In FIG. 21C and FIG. _21D , the code division selection drive in the first direction D _x corresponds to the component “1” in the fourth row of the square matrix H _h , and the detection electrode block 25B (m) the first electrode 25 of the 25B (m + 3) is selected as the first detection target square matrix _{H h.} In correspondence to the component "-1" in the third line of the square matrix _{H h,} selection detection electrode block 25B (m + 1), the first electrode 25 of the 25B (m + 2) as the second detection target square matrix _{H h} Is done. In the positive sign selection operation Te ₀₃ ^{+ of} the fourth detection operation shown in FIG. 21C, the output signal Svh ₀₃ ⁺ = Svh ₀₃ ⁺⁺ −Svh ₀₃ ^{+ −} is calculated. In the negative sign selection operation Te ₀₃ ^{− of} the fourth detection operation shown in FIG. 21D, the output signal Svh ₀₃ ⁻ = Svh ₀₃ ^{− +} −Svh ₀₃ ⁻⁻ is calculated. From the difference between the output signal Svh ₀₃ ⁺ and the output signal Svh ₀₃ ⁻ , the third output signal Svh ₀₃ in the fourth detection operation is calculated.

22A shows the positive sign selection operation Te ₁₀ ⁺ of the fifth detection operation, FIG. 22B shows the negative sign selection operation Te ₁₀ ⁻ of the fifth detection operation, and FIG. FIG. 22D shows the positive sign selection operation Te ₁₁ ⁺ of the sixth detection operation, and FIG. 22D shows the negative sign selection operation Te ₁₁ ⁻ of the sixth detection operation. FIG. 23A shows a positive sign selection operation Te ₁₂ ⁺ of the seventh detection operation, FIG. 23B shows a negative sign selection operation Te ₁₂ ⁻ of the seventh detection operation, and FIG. FIG. 23D shows the positive sign selection operation Te ₁₃ ⁺ of the eighth detection operation, and FIG. 23D shows the negative sign selection operation Te ₁₃ ⁻ of the eighth detection operation.

As shown in FIGS. 22 and 23, the code division selectively driven in the first direction _{D x} in the eighth detection operation from the fifth detection operation, from FIG. 20 (D) and FIG. 21 (A) from FIG. 20 (A) similar to FIG. 21 (D), the first electrode 25 of the second detection target of the first detection target and square matrix H _h square matrix H _h is selected.

The positive sign selection operation _{Te 10} ⁺ the fifth detection operation shown in FIG. 22 (A), in correspondence with the components "1" of the second row of square matrix _{H v,} the second electrode block BKNB (n), BKNB ( n + 2) first electrode 25 is selected as the first electrode 25 of the first detection target square matrix _{H v.} Corresponding to the component “1” in the first row of the square matrix H _h , the first electrodes 25 belonging to the detection electrode blocks 25B (m), 25B (m + 1), 25B (m + 2), 25B (m + 3) It is selected as the first electrode 25 of the first detection target square matrix H _h. In the positive sign selection operation Te ₁₀ ^{+ of} the fifth detection operation shown in FIG. 22A, the output signal Svh ₁₀ ⁺ = Svh ₁₀ ⁺⁺ −Svh ₁₀ ^{+ −} is calculated.

Negative sign selection operation _{Te 10} of the fifth detection operation shown in FIG. 22 (B) ^- In, corresponds to the second line of the components of the square matrix _{H v} "-1", the second electrode block BKNB (n + 1), BKNB (n + 3) the first electrode 25 is selected as the first electrode 25 of the second detection target square matrix _{H v.} In the negative sign selection operation Te ₁₀ ^{− of} the fifth detection operation shown in FIG. 22B, the output signal Svh ₁₀ ⁻ = Svh ₁₀ ^{− +} −Svh ₁₀ ⁻⁻ is calculated. From the difference between the output signal Svh ₁₀ ⁺ and the output signal Svh ₁₀ ⁻ , the third output signal Svh ₁₀ in the fifth detection operation is calculated.

In the sixth detection operations of FIGS. 22C and _22D , the code division selection drive in the second direction _{Dy is} the same selection as in FIGS. 22A and 22B, respectively. . In the code division selection driving in the first direction D _x , the first electrodes 25 of the detection electrode blocks 25B (m) and 25B (m + 2) are square matrices corresponding to the component “1” in the second row of the square matrix H _h. It is selected as the first detection target H _h. In correspondence to the component "-1" in the second line of the square matrix _{H h,} selection detection electrode block 25B (m + 1), the first electrode 25 of the 25B (m + 3) as the second detection target square matrix _{H h} Is done. In the positive sign selection operation Te ₁₁ ^{+ of} the sixth detection operation shown in FIG. 22C, the output signal Svh ₁₁ ⁺ = Svh ₁₁ ⁺⁺ −Svh ₁₁ ^{+ −} is calculated. In the negative sign selection operation Te ₁₁ ^{− of} the sixth detection operation shown in FIG. 22D, the output signal Svh ₁₁ ⁻ = Svh ₁₁ ^{− +} −Svh ₁₁ ⁻⁻ is calculated. From the difference between the output signal Svh ₁₁ ⁺ and the output signal Svh ₁₁ ⁻ , the third output signal Svh ₁₁ in the sixth detection operation is calculated.

In the seventh detection operation shown in FIGS. 23A and _23B , the code division selection drive in the second direction Dy is the same selection as in FIGS. 22A and 22B. ing. In the seventh detection operation, the code division selection driving in the first direction D _x corresponds to the component “1” in the third row of the square matrix H _h , and the detection electrode blocks 25B (m) and 25B (m + 1) 1 electrode 25 is selected as the first detection target square matrix H _h. In correspondence to the component "-1" in the third line of the square matrix _{H h,} selection detection electrode block 25B (m + 2), first electrode 25 of the 25B (m + 3) as the second detection target square matrix _{H h} Is done.

In the positive sign selection operation Te ₁₂ ^{+ of} the seventh detection operation shown in FIG. 23A, the output signal Svh ₁₂ ⁺ = Svh ₁₂ ⁺⁺ −Svh ₁₂ ^{+ −} is calculated. In the negative sign selection operation Te ₁₂ ^{− of} the seventh detection operation shown in FIG. 23B, the output signal Svh ₁₂ ⁻ = Svh ₁₂ ^{− +} −Svh ₁₂ ⁻⁻ is calculated. From the difference between the output signal Svh ₁₂ ⁺ and the output signal Svh ₁₂ ⁻ , the third output signal Svh ₁₂ in the seventh detection operation is calculated.

In the eighth detection operation shown in FIGS. 23C and _23D , the code division selection drive in the second direction _{Dy is} the same selection as in FIGS. 22A and 22B, respectively. ing. In an eighth detection operation, code division selectively driven in the first direction _{D x,} corresponding to the components "1" of the fourth line of square matrix _{H h,} detection electrode block 25B (m), 25B of (m + 3) the 1 electrode 25 is selected as the first detection target square matrix H _h. In correspondence to the component "-1" in the fourth line of square matrix _{H h,} selection detection electrode block 25B (m + 1), the first electrode 25 of the 25B (m + 2) as the second detection target square matrix _{H h} Is done.

In the positive sign selection operation Te ₁₃ ^{+ of} the eighth detection operation shown in FIG. 23C, the output signal Svh ₁₃ ⁺ = Svh ₁₃ ⁺⁺ −Svh ₁₃ ^{+ −} is calculated. In the negative sign selection operation Te ₁₃ ^{− of} the eighth detection operation shown in FIG. 23D, the output signal Svh ₁₃ ⁻ = Svh ₁₃ ^{− +} −Svh ₁₃ ⁻⁻ is calculated. From the difference between the output signal Svh ₁₃ ⁺ and the output signal Svh ₁₃ ⁻ , the third output signal Svh ₁₃ in the eighth detection operation is calculated.

FIG. 24A shows a positive sign selection operation Te ₂₀ ⁺ of the ninth detection operation, FIG. 24B shows a negative sign selection operation Te ₂₀ ⁻ of the ninth detection operation, and FIG. FIG. 24D shows the negative sign selection operation Te ₂₁ ⁻ of the tenth detection operation. FIG. 24D shows the positive sign selection operation Te ₂₁ ⁺ of the tenth detection operation. FIG. 25A shows the positive sign selection operation Te ₂₂ ⁺ of the eleventh detection operation, FIG. 25B shows the negative sign selection operation Te ₂₂ ⁻ of the eleventh detection operation, and FIG. FIG. 25D shows the positive sign selection operation Te ₂₃ ⁺ of the twelfth detection operation, and FIG. 25D shows the negative sign selection operation Te ₂₃ ⁻ of the twelfth detection operation.

As shown in FIGS. 24 and 25, the code division selectively driven in the first direction _{D x} in the 12 detection operation from the ninth detection operation, from FIG. 20 (D) and FIG. 21 (A) from FIG. 20 (A) similar to FIG. 21 (D), the first electrode 25 of the second detection target of the first detection target and square matrix H _h square matrix H _h is selected.

Figure 24 9 in the positive sign selection operation _{Te 20} ⁺ detection operation (A), the corresponding to components of "1" in the third line of the square matrix _{H v,} the second electrode block BKNB (n), BKNB ( n + 1) first electrode 25 is selected as the first electrode 25 of the first detection target square matrix _{H v.} Corresponding to the component “1” in the first row of the square matrix H _h , the first electrodes 25 belonging to the detection electrode blocks 25B (m), 25B (m + 1), 25B (m + 2), 25B (m + 3) It is selected as the first electrode 25 of the first detection target square matrix H _h. In the positive sign selection operation Te ₂₀ ^{+ of} the ninth detection operation shown in FIG. 24A, the output signal Svh ₂₀ ⁺ = Svh ₂₀ ⁺⁺ −Svh ₂₀ ^{+ −} is calculated.

Figure 24 (B) are shown the ninth detection operation of the negative code selection operation _{Te 20} ^- In, corresponds to the component of the third row of the square matrix _{H v} "-1", the second electrode block BKNB (n + 2), BKNB (n + 3) the first electrode 25 is selected as the first electrode 25 of the second detection target square matrix _{H v.} In the negative sign selection operation Te ₂₀ ^{− of} the ninth detection operation shown in FIG. 24B, the output signal Svh ₂₀ ⁻ = Svh ₂₀ ^{− +} −Svh ₂₀ ⁻⁻ is calculated. From the difference between the output signal Svh ₂₀ ⁺ and the output signal Svh ₂₀ ⁻ , the third output signal Svh ₂₀ in the ninth detection operation is calculated.

In the tenth detection operations of FIGS. 24C and _24D , the code division selection drive in the second direction _{Dy is} the same selection as in FIGS. 24A and 24B, respectively. . In the code division selection driving in the first direction D _x , the first electrodes 25 of the detection electrode blocks 25B (m) and 25B (m + 2) are square matrices corresponding to the component “1” in the second row of the square matrix H _h. It is selected as the first detection target H _h. In correspondence to the component "-1" in the second line of the square matrix _{H h,} selection detection electrode block 25B (m + 1), the first electrode 25 of the 25B (m + 3) as the second detection target square matrix _{H h} Is done. In the positive sign selection operation Te ₂₁ ^{+ of} the tenth detection operation shown in FIG. 24C, the output signal Svh ₂₁ ⁺ = Svh ₂₁ ⁺⁺ −Svh ₂₁ ^{+ −} is calculated. In the negative sign selection operation Te ₂₁ ^{− of} the tenth detection operation shown in FIG. 24D, the output signal Svh ₂₁ ⁻ = Svh ₂₁ ^{− +} −Svh ₂₁ ⁻⁻ is calculated. From the difference between the output signal Svh ₂₁ ⁺ and the output signal Svh ₂₁ ⁻ , the third output signal Svh ₂₁ in the tenth detection operation is calculated.

In the eleventh detection operations shown in FIGS. 25A and 25B, the code division selection drive in the second direction Dy is the same selection as in FIGS. 24A and _24B , respectively. ing. In the 11 detection operation, code division selectively driven in the first direction _{D x,} corresponding to the components of the third row of the square matrix _{H h} "1", the detection electrode block 25B (m), 25B (m + 1) first 1 electrode 25 is selected as the first detection target square matrix H _h. In correspondence to the component "-1" in the third line of the square matrix _{H h,} selection detection electrode block 25B (m + 2), first electrode 25 of the 25B (m + 3) as the second detection target square matrix _{H h} Is done.

In the positive sign selection operation Te ₂₂ ^{+ of} the eleventh detection operation shown in FIG. 25A, the output signal Svh ₂₂ ⁺ = Svh ₂₂ ⁺⁺ −Svh ₂₂ ^{+ −} is calculated. In the negative sign selection operation Te ₂₂ ^{− of} the eleventh detection operation shown in FIG. 25B, the output signal Svh ₂₂ ⁻ = Svh ₂₂ ^{− +} −Svh ₂₂ ⁻⁻ is calculated. From the difference between the output signal Svh ₂₂ ⁺ and the output signal Svh ₂₂ ⁻ , the third output signal Svh ₂₂ in the eleventh detection operation is calculated.

In the twelfth detection operation shown in FIGS. 25C and _25D , the code division selection drive in the second direction _{Dy is} the same selection as in FIGS. 24A and _24B , respectively. ing. In the twelfth detection operation, the code division selection drive in the first direction D _x corresponds to the component “1” in the fourth row of the square matrix H _h , and the detection electrode blocks 25B (m) and 25B (m + 3) 1 electrode 25 is selected as the first detection target square matrix H _h. In correspondence to the component "-1" in the fourth line of square matrix _{H h,} selection detection electrode block 25B (m + 1), the first electrode 25 of the 25B (m + 2) as the second detection target square matrix _{H h} Is done.

In the positive sign selection operation Te ₂₃ ^{+ of} the twelfth detection operation shown in FIG. 25C, the output signal Svh ₂₃ ⁺ = Svh ₂₃ ⁺⁺ −Svh ₂₃ ^{+ −} is calculated. In the negative sign selection operation Te ₂₃ ^{− of} the twelfth detection operation illustrated in FIG. 25D, the output signal Svh ₂₃ ⁻ = Svh ₂₃ ^{− +} −Svh ₂₃ ⁻⁻ is calculated. From the difference between the output signal Svh ₂₃ ⁺ and the output signal Svh ₂₃ ⁻ , the third output signal Svh ₂₃ in the twelfth detection operation is calculated.

26A shows the positive sign selection operation Te ₃₀ ⁺ of the thirteenth detection operation, FIG. 26B shows the negative sign selection operation Te ₃₀ ⁻ of the thirteenth detection operation, and FIG. FIG. 26D shows the positive sign selection operation Te ₃₁ ⁺ of the fourteenth detection operation, and FIG. 26D shows the negative sign selection operation Te ₃₁ ⁻ of the fourteenth detection operation. 27A shows the positive sign selection operation Te ₃₂ ⁺ of the fifteenth detection operation, FIG. 27B shows the negative sign selection operation Te ₃₂ ⁻ of the fifteenth detection operation, and FIG. FIG. 27D shows the positive sign selection operation Te ₃₃ ⁺ of the sixteenth detection operation, and FIG. 27D shows the negative sign selection operation Te ₃₃ ⁻ of the sixteenth detection operation.

As shown in FIGS. 26 and 27, the code division selectively driven in the first direction _{D x} in the 16 detection operation from the 13 detection operation, from FIG. 20 (D) and FIG. 21 (A) from FIG. 20 (A) similar to FIG. 21 (D), the first electrode 25 of the second detection target of the first detection target and square matrix H _h square matrix H _h is selected.

13 in the detection operation of the positive sign selection operation _{Te 30} ⁺ shown in FIG. 26 (A), corresponding to the components "1" of the fourth line of square matrix _{H v,} the second electrode block BKNB (n), BKNB ( n + 3) the first electrode 25 is selected as the first electrode 25 of the first detection target square matrix _{H v.} Corresponding to the component “1” in the first row of the square matrix H _h , the first electrodes 25 belonging to the detection electrode blocks 25B (m), 25B (m + 1), 25B (m + 2), 25B (m + 3) It is selected as the first electrode 25 of the first detection target square matrix H _h. In the positive sign selection operation Te ₃₀ ^{+ of} the thirteenth detection operation shown in FIG. 26A, the output signal Svh ₃₀ ⁺ = Svh ₃₀ ⁺⁺ −Svh ₃₀ ^{+ −} is calculated.

Negative sign selection operation _{Te 30} of the 13 detection operation shown in FIG. 26 (B) ^- In, corresponding to the components of the fourth row of the square matrix _{H v} "-1", the second electrode block BKNB (n + 1), BKNB (n + 2) first electrode 25 is selected as the first electrode 25 of the second detection target square matrix _{H v.} In the negative sign selection operation Te ₃₀ ^{− of} the thirteenth detection operation shown in FIG. 26B, the output signal Svh ₃₀ ⁻ = Svh ₃₀ ^{− +} −Svh ₃₀ ⁻⁻ is calculated. Output signal _{Svh 30} ⁺ and the output signal _{Svh 30} ^- from the difference, the third output signal _{Svh 30} in the 13 detection operation is calculated.

In the fourteenth detection operations of FIGS. 26C and _26D , the code division selection drive in the second direction _{Dy is} the same selection as in FIGS. 26A and 26B, respectively. . In the code division selection driving in the first direction D _x , the first electrodes 25 of the detection electrode blocks 25B (m) and 25B (m + 2) are square matrices corresponding to the component “1” in the second row of the square matrix H _h. It is selected as the first detection target H _h. In correspondence to the component "-1" in the second line of the square matrix _{H h,} selection detection electrode block 25B (m + 1), the first electrode 25 of the 25B (m + 3) as the second detection target square matrix _{H h} Is done. In the positive sign selection operation Te ₃₁ ^{+ of} the fourteenth detection operation shown in FIG. 26C, the output signal Svh ₃₁ ⁺ = Svh ₃₁ ⁺⁺ −Svh ₃₁ ^{+ −} is calculated. In the negative sign selection operation Te ₃₁ ^{− of} the fourteenth detection operation illustrated in FIG. 26D, the output signal Svh ₃₁ ⁻ = Svh ₃₁ ^{− +} −Svh ₃₁ ⁻⁻ is calculated. From the difference between the output signal Svh ₃₁ ⁺ and the output signal Svh ₃₁ ⁻ , the third output signal Svh ₃₁ in the fourteenth detection operation is calculated.

In the fifteenth detection operations shown in FIGS. 27A and 27B, the code division selection drive in the second direction Dy is the same selection as in FIGS. 26A and _26B , respectively. ing. In the fifteenth detection operation, the code division selection drive in the first direction D _x corresponds to the component “1” in the third row of the square matrix H _h and the detection electrode blocks 25B (m) and 25B (m + 1) 1 electrode 25 is selected as the first detection target square matrix H _h. In correspondence to the component "-1" in the third line of the square matrix _{H h,} selection detection electrode block 25B (m + 2), first electrode 25 of the 25B (m + 3) as the second detection target square matrix _{H h} Is done.

In the positive sign selection operation Te ₃₂ ^{+ of} the fifteenth detection operation shown in FIG. 27A, the output signal Svh ₃₂ ⁺ = Svh ₃₂ ⁺⁺ −Svh ₃₂ ^{+ −} is calculated. In the negative sign selection operation Te ₃₂ ^{− of} the fifteenth detection operation shown in FIG. 27B, the output signal Svh ₃₂ ⁻ = Svh ₃₂ ^{− +} −Svh ₃₂ ⁻⁻ is calculated. Output signal _{Svh 32} ⁺ and the output signal _{Svh 32} ^- from the difference, the third output signal _{Svh 32} in the 15 detection operation is calculated.

In the sixteenth detection operation shown in FIGS. 27C and _27D , the code division selection drive in the second direction _{Dy is} the same selection as in FIGS. 26A and _26B , respectively. ing. In the sixteenth detection operation, the code division selection drive in the first direction D _x corresponds to the component “1” in the fourth row of the square matrix H _h , and the detection electrode blocks 25B (m) and 25B (m + 3) 1 electrode 25 is selected as the first detection target square matrix H _h. In correspondence to the component "-1" in the fourth line of square matrix _{H h,} selection detection electrode block 25B (m + 1), the first electrode 25 of the 25B (m + 2) as the second detection target square matrix _{H h} Is done.

In the positive sign selection operation Te ₃₃ ^{+ of} the sixteenth detection operation shown in FIG. 27C, the output signal Svh ₃₃ ⁺ = Svh ₃₃ ⁺⁺ −Svh ₃₃ ^{+ −} is calculated. In the negative sign selection operation Te ₃₃ ^{− of} the sixteenth detection operation shown in FIG. 27D, the output signal Svh ₃₃ ⁻ = Svh ₃₃ ^{− +} −Svh ₃₃ ⁻⁻ is calculated. From the difference between the output signal Svh ₃₃ ⁺ and the output signal Svh ₃₃ ⁻ , the third output signal Svh ₃₃ in the sixteenth detection operation is calculated.

  As described above, the signal calculation unit 44 (see FIG. 2) calculates data of the 16 output signals Svh by the first detection operation to the sixteenth detection operation. Data of the output signal Svh is stored in the storage unit 47. The coordinate extraction unit 45 (see FIG. 2) receives the data of the output signal Svh from the storage unit 47 and performs a decoding process based on Expression (7).

(Equation 7)
Si ′ = H _v × Svh × H _h (7)

Here, Si ′ is a decoded signal, and is a matrix corresponding to each first electrode 25 shown in FIGS. H _v is the square matrix shown in Equation (2) is a transformation matrix in the second direction _{D y.} H _h is a square matrix shown in Expression (6), and is a transformation matrix in the second direction D _y . The coordinate extraction unit 45 can acquire a detection signal of each detection electrode included in the detection electrode block 25B (m) or the second detection electrode block BKNB (n) by executing the decoding process by the decoding process. The coordinate extraction unit 45 (see FIG. 2) can calculate two-dimensional coordinates such as a finger that touches or approaches based on the decoded signal Si ′. Also in the present embodiment, the decoding process is performed based on the output signal obtained by integrating the detection signals of the first electrodes 25, thereby increasing the signal of 16 times the time division selection drive without increasing the voltage of the signal value of each node. Strength will be obtained.

It is possible to improve noise tolerance by continuously performing the positive code selection operation and the negative code selection operation. For example, in the first detection operation illustrated in FIG. 20, four first output signals Svh ₀₀ ⁺⁺ , second output signal Svh ₀₀ ^{+ −} , first output signal Svh ₀₀ ^{− +} , and second output signal Svh ₀₀ ⁻⁻ When measuring by time division, it is preferable to measure in this order. Since the interval between the detection times of the first detection target and the second detection target of the square matrix H _h is shortened, the noise component on each output signal is canceled. Alternatively, for example, the first output signal Svh ₀₀ ⁺⁺ , the first output signal Svh ₀₀ ^{− +} , the second output signal Svh ₀₀ ^{+ −} , and the second output signal Svh ₀₀ ⁻⁻ may be measured in this order. In this case, a first detection target square matrix H _v, the spacing of the second detection target detection time is shortened, the noise component riding on each output signal is canceled. Alternatively, the negative sign selection operation may be executed after the positive sign selection operation is continuously executed a plurality of times. The order of the detection operations shown in FIGS. 20 to 27 may be changed as appropriate.

(Fifth embodiment)
FIG. 28 is a block diagram of the first electrode and each drive circuit according to the fifth embodiment. In the first to fourth embodiments, the case where the first electrode 25 is used as both the detection electrode of the detection unit 30 and the common electrode of the display panel 20 has been described. However, the present invention is not limited to this. As shown in FIG. 28, the first electrode 25A may be used both as a display pixel electrode and a detection electrode. In the present embodiment, unlike the first to fourth embodiments, the second electrode 22A may not be formed with a slit, and a plurality of first electrodes 25A may be superimposed on the second electrode 22A in a matrix. Has been placed.

  As shown in FIG. 28, the gate line GCL and the data line SGL are arranged to cross each other. The first electrode 25A is disposed in a region surrounded by the gate line GCL and the data line SGL. The source driver 13 includes a multiplexer 13B, a drive signal generation unit 13C, and a pixel signal generation unit 13D. The plurality of first electrodes 25A are connected to the multiplexer 13B via the data line SGL. The gate line GCLt is supplied with a scanning signal for scanning the first electrode 25A arranged extending in a direction parallel to the gate line GCL. The scanning signal includes a display scanning signal Vscan or a detection scanning signal Vscans. Data line SGLt is arranged extending in a direction parallel to data line SGL. A display drive signal Vcom at the time of the display operation is supplied to the data line SGLt.

  28, illustration of the switch elements SW5 and xSW5, the wirings L1, L2, and L3, and the selection signal generation unit 16 in FIG. 11 is omitted.

  In the display periods Pd1 and Pd2 (see FIG. 10), the pixel signal Vpix output from the pixel signal generation unit 13D is supplied to the multiplexer 13B. The pixel signal Vpix is supplied to the first electrode 25A selected by the multiplexer 13B, and the display operation is executed. The first electrode 25 is supplied with a display drive signal Vcom from the first electrode driver 14.

  In the detection periods Pt1 and Pt2 (see FIG. 10), the detection drive signal Vs output from the drive signal generation unit 13C is supplied to the multiplexer 13B. The detection drive signal Vs is supplied to the first electrode 25A selected by the multiplexer 13B, and the detection operation is executed. The multiplexer 13B selects the first electrode 25A that is the first detection target and the first electrode 25A that is the second detection target that is not included in the first detection target based on the predetermined code described above, and detects the detection drive signal Vs. Supply. An output signal obtained by integrating the detection signals from the plurality of first electrodes 25A is output from the multiplexer 13B to the signal processing unit 40 (see FIGS. 1 and 2). Thereby, code division selection driving is executed.

  When the first electrode 25A is used as a detection electrode, the detection drive signal Vs may be supplied to a plurality of adjacent first electrodes 25A, and the plurality of first electrodes 25A may be driven in a bundle. By so doing, detection can be performed with appropriate resolution as compared with the case where the first electrodes 25A are individually driven, and the time required for detection of the entire detection surface can be shortened.

  In the present embodiment, the multiplexer 13B has a function of selecting the first electrode 25A that is the target of the display operation and a function of selecting the first electrode 25A that is the first detection target and the second detection target of the detection operation. The gate line GCL functions as a detection gate line GCLs (see FIG. 8) for scanning the first electrode 25A during the detection operation, and the data line SGL is detection data for supplying the detection drive signal Vs. It functions as a line SGLs.

  In the detection periods Pt1 and Pt2, the first electrode driver 14 may supply a signal having the same waveform synchronized with the detection drive signal Vs to the second electrode 22A. Thereby, since the second electrode 22A is driven at the same potential as the first electrode 25A, the parasitic capacitance between the first electrode 25A and the second electrode 22A is reduced. In this case, the second electrode 22A is used as a guard electrode.

(Sixth embodiment)
FIG. 29 is a cross-sectional view illustrating a schematic cross-sectional structure of a display device according to the sixth embodiment. In the first to fourth embodiments, the case where the first electrode 25 serves as both the detection electrode of the detection unit 30 and the common electrode of the display panel 20 has been described. However, the present invention is not limited to this. A display device 1 </ b> A illustrated in FIG. 29 includes a pixel substrate 2, a counter substrate 3 facing the pixel substrate 2, and a liquid crystal layer 6. In the pixel substrate 2, a common electrode COML is provided on the first substrate 21, and a second electrode (pixel electrode) 22 is provided on the common electrode COML via an insulating layer 24. The common electrode COML is supplied with a display drive signal Vcom that becomes a common potential for the sub-pixel SPix during a display operation.

  In the present embodiment, the common electrode COML, the insulating layer 24, and the second electrode 22 are stacked in this order on the first substrate 21, but the present invention is not limited thereto. An electrode different from the pixel electrode and the common electrode of the display panel 20 may be used as the detection electrode. The second electrode 22, the insulating layer 24, and the common electrode COML may be stacked on the first substrate 21 in this order, and the common electrode COML and the second electrode 22 are formed in the same layer via the insulating layer 24. May be. Furthermore, at least one of the common electrode COML and the second electrode 22 may be disposed on the second substrate 31. The common electrode COML may be provided continuously over the entire surface of the region overlapping the display region Ad (see FIG. 5), or may be provided in a plurality of divisions. Further, the first electrode 25 may be formed on a substrate different from the second substrate 31 and the detection unit 30 may be mounted on the display panel 20.

  In the counter substrate 3, a color filter 32 is provided on the lower surface of the second substrate 31, and a first electrode 25 that is a detection electrode is provided on the second substrate 31. In this case, the above-described detection switching element Trs, detection data line SGLs, detection gate line GCLs, and the like are provided on the second substrate 31 side. In the present embodiment, the detection unit 30 is configured by the second substrate 31 and the first electrode 25. Even in such an aspect, the detection unit 30 can obtain good detection sensitivity by suppressing capacitive coupling between the first electrodes 25 by the above-described code division selection drive.

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

  For example, a detection device that does not include the display panel 20 and includes the detection unit 30 may be used. In this case, at least the first substrate 21, the first electrode 25, the first electrode driver 14, the detection gate driver 12 </ b> B, the signal processing unit 40, and the control unit 11 may be provided. Although the first electrode 25 and the second electrode 22 are rectangular, they are not limited to this, and may have other shapes. For example, the first electrode 25 and the second electrode 22 may have a polygonal shape or a comb shape. Each detection operation is not limited to the order shown in FIGS. 20 to 28, and can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1, 1A Display device 2 Pixel substrate 3 Opposite substrate 6 Liquid crystal layer 10 Display unit with detection function 11 Control unit 12A Display gate driver 12B Detection gate driver 13 Source driver 14 First electrode driver 20 Display panel 21 First substrate 22 First 2 electrode 25 first electrode 30 detection unit 31 second substrate 40 signal processing unit 42 detection signal amplification unit 43 A / D conversion unit 44 signal calculation unit 45 coordinate extraction unit 46 detection timing control unit 47 storage unit GCL gate line GCLs for detection Gate line Pix pixel SPix Subpixel SGL Data line SGLs Detection data line Vcom Display drive signal Vs Detection drive signal Vpix Pixel signal Vscan Display scan signal Vscan Detection scan signal

Claims (17)

A detection electrode group including a plurality of first electrodes for detecting a detection signal that changes due to contact or proximity of an external object;
An output signal line;
In response to the first selection signal, the first electrode of the first detection target in the detection electrode group is connected to the output signal line, and the detection signals from the selected first electrode of the first detection target are integrated. The first output signal is output to the output signal line, and in response to a second selection signal different from the first selection signal, the second detection target of the detection electrode group that is not included in the first detection target. A selection connecting unit that connects the first electrode and the output signal line, and outputs a second output signal integrated with the detection signal from the selected first electrode of the second detection target to the output signal line; Having a detection device.   The detection apparatus according to claim 1, wherein the output signal line includes a first output signal line to which the first output signal is supplied and a second output signal line to which the second output signal is supplied.   The detection device according to claim 2, wherein the selective connection unit simultaneously selects the first electrode to be detected and the first electrode to be detected.   The detection device according to claim 1, wherein the selection connection unit selects the first electrode to be detected first and the first electrode to be detected second by time division.   5. The detection according to claim 4, wherein a detection operation in which the selection connecting unit selects the first electrode to be detected first and a detection operation to select the first electrode to be detected in the second are continuously performed. apparatus.   6. The detection device according to claim 1, wherein at least one of the first selection signal and the second selection signal is generated based on a predetermined code. The first selection signal includes a plurality of first selection patterns that are combination patterns of the first electrodes selected as the first detection target,
The detection device according to claim 6, wherein the number of the first selection patterns is equal to the number of the first electrodes included in the detection electrode group.   The first selection signal includes a plurality of second selection patterns which are combination patterns of the first electrodes selected as the second detection target, and the number of the second selection patterns is the first selection pattern. The detection device according to claim 7, which is equal to the number of. In addition, it has a signal processing unit,
The signal processing unit calculates a detection signal of one of the first electrodes included in the detection electrode group based on the plurality of first output signals and the plurality of second output signals. 9. The detection device according to any one of items 8. A first electrode driver for supplying a drive signal to the first electrode;
10. The detection device according to claim 1, wherein the first electrode is supplied with the driving signal and outputs the detection signal based on a change in capacitance of the first electrode. 11.   The detection according to claim 10, wherein the first electrode driving unit supplies a drive signal having the same polarity as a drive signal supplied to the first electrode to be detected to the first electrode to be detected. apparatus. A switching element provided corresponding to each of the plurality of first electrodes;
Further, the selection connecting unit has a selection driving unit,
The said selection drive part selects the said detection electrode group used as a detection target among the said some detection electrode groups sequentially, and supplies a detection scanning signal to the said switching element of the selected said detection electrode group. Item 12. The detection device according to any one of Items 11.   The detection device according to claim 12, wherein the selection driving unit selects the detection electrode group to be detected based on a predetermined code.   The selective connection unit includes a plurality of data lines and a multiplexer, and each of the plurality of data lines is selectively connected to the detection electrode included in the detection electrode group, and the multiplexer includes the output The detection device according to claim 1, wherein the data line connected to the signal line is selected. A display functional layer for displaying an image;
A detection electrode group including a plurality of first electrodes for detecting a detection signal that changes due to contact or proximity of an external object;
An output signal line;
In response to the first selection signal, the first electrode of the first detection target in the detection electrode group is connected to the output signal line, and the detection signals from the selected first electrode of the first detection target are integrated. The first output signal is output to the output signal line, and in response to a second selection signal different from the first selection signal, the second detection target of the detection electrode group that is not included in the first detection target. A selection connecting unit that connects the first electrode and the output signal line, and outputs a second output signal integrated with the detection signal from the selected first electrode of the second detection target to the output signal line; Display device. A second electrode facing the first electrode;
The display device according to claim 15, wherein a display function layer is controlled by the first electrode and the second electrode. A detection electrode group including a plurality of first electrodes for detecting a detection signal that changes due to contact or proximity of an external object, an output signal line, and connection and disconnection of the first electrode and the output signal line A detection method of a detection device having a selective connection to be switched,
In response to a first selection signal, the selection connection unit connects the first electrode of the first detection target in the detection electrode group and the output signal line, and from the selected first electrode of the first detection target Outputting a first output signal integrated with the detection signal to the output signal line;
In response to a second selection signal different from the first selection signal, the first electrode of the second detection target not included in the first detection target in the detection electrode group and the output signal line are connected and selected. And outputting a second output signal obtained by integrating the detection signals from the first electrodes to be detected to the output signal line.

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