JP6268313B2 - Display device - Google Patents

Description

  The present invention relates to a display device capable of detecting an external proximity object, and more particularly to a display device capable of detecting an external proximity object based on a change in capacitance.

  In recent years, a so-called touch panel called a touch detection device capable of detecting an external proximity object has attracted attention. The touch panel is mounted on or integrated with a display device such as a liquid crystal display device, and is used for a display device with a touch detection function. The display device with a touch detection function displays various button images and the like on the display device, thereby enabling information input using the touch panel as a substitute for a normal mechanical button. A display device with a touch detection function having such a touch panel does not require an input device such as a keyboard, a mouse, or a keypad, so that it can be used not only in computers but also in portable information devices such as mobile phones. Tend to.

  There are several types of touch detection devices such as an optical type, a resistance type, and a capacitance type. When a capacitive touch detection device is used for a portable information terminal or the like, a device having a relatively simple structure and low power consumption can be realized. For example, Patent Literature 1 and Patent Literature 2 describe capacitive touch panels.

JP 2011-2333018 A JP 2012-047807 A

  By the way, the display device with a touch detection function needs to increase the frequency of the drive signal supplied to the drive electrode in order to increase the screen size or the definition. In contrast, in the display device with a touch detection function, a pixel signal for displaying an image on the pixel electrode is also supplied to the plurality of signal lines. In recent years, a display device with a touch detection function is required to be thin, and thus the distance between the drive electrode and the signal line is shortened. When the drive electrode and the signal line are three-dimensionally crossed, the parasitic capacitance between the drive electrode and the signal line increases, and it may take time to charge and discharge the drive electrode.

  The display devices with a touch detection function described in Patent Document 1 and Patent Document 2 described above do not take into account that the parasitic capacitance between the drive electrode and the signal line increases.

  The present disclosure has been made in view of such problems, and an object thereof is to provide a display device capable of performing touch detection while suppressing the influence of parasitic capacitance between a drive electrode and a signal line. .

  The display device of the present disclosure is configured to face the substrate, the plurality of pixel electrodes arranged on the substrate, the plurality of signal lines electrically connected to the plurality of pixel electrodes, and the plurality of signal lines. A plurality of drive electrodes arranged; and a scan drive unit that applies a touch drive signal for touch detection to at least one selected first drive electrode among the plurality of drive electrodes, and the scan drive unit Applies the same rectangular wave as the touch drive signal to at least one first signal line facing the selected first drive electrode.

  An electronic apparatus according to the present disclosure includes the display device, and includes, for example, a television device, a digital camera, a personal computer, a video camera, or a mobile terminal device such as a mobile phone.

  The display device of the present disclosure can reduce the parasitic capacitance between the drive electrode and the signal line, and can suppress the influence of charging and discharging of the drive electrode. For this reason, the display device of the present disclosure can suppress power consumption for touch detection. Further, the display device of the present disclosure can increase the frequency of the drive signal supplied to the drive electrode.

  According to the display device of the present disclosure, it is possible to reduce the thickness, enlarge the screen, or increase the definition.

FIG. 1 is a block diagram illustrating a configuration example of a display device with a touch detection function according to the first embodiment. FIG. 2 is an explanatory diagram illustrating a state in which a finger is not in contact with or in proximity to the device in order to explain the basic principle of the capacitive touch detection method. FIG. 3 is an explanatory diagram showing an example of an equivalent circuit in a state where the finger shown in FIG. 2 is not in contact with or close to the device. FIG. 4 is an explanatory diagram illustrating a state in which a finger is in contact with or close to the device in order to explain the basic principle of the capacitive touch detection method. FIG. 5 is an explanatory diagram showing an example of an equivalent circuit in a state where the finger shown in FIG. 4 is in contact with or close to the apparatus. FIG. 6 is a diagram illustrating an example of waveforms of the drive signal and the touch detection signal. FIG. 7 is a diagram illustrating an example of a module in which the display device with a touch detection function according to the first embodiment is mounted. FIG. 8 is a schematic diagram illustrating the relationship between drive electrodes and pixel signal lines in a module in which the display device with a touch detection function according to the first embodiment is mounted. FIG. 9 is a cross-sectional view illustrating a schematic cross-sectional structure of the display unit with a touch detection function according to the first embodiment. FIG. 10 is a circuit diagram illustrating a pixel array of the display unit with a touch detection function according to the first embodiment. FIG. 11 is a schematic cross-sectional view illustrating the relationship among the drive electrode, the pixel signal line, and the pixel electrode in the module in which the display device with a touch detection function according to the first embodiment is mounted. FIG. 12 is a schematic diagram for explaining the relationship among drive electrodes, pixel signal lines, and pixels in the module in which the display device with a touch detection function according to the first embodiment is mounted. FIG. 13 is a perspective view illustrating a configuration example of drive electrodes and touch detection electrodes of the display unit with a touch detection function according to the first embodiment. FIG. 14 is a schematic diagram illustrating an operation example of the drive electrode driver according to the first embodiment. FIG. 15 is a schematic diagram illustrating the relationship between the display operation period and the touch detection operation period according to the first embodiment. FIG. 16 is a schematic diagram for explaining the relationship among drive electrodes, pixel signal lines, and pixels in a module in which a display device with a touch detection function according to a modification of the first embodiment is mounted. FIG. 17 is a schematic cross-sectional view illustrating the relationship among drive electrodes, pixel signal lines, and pixel electrodes in a module in which the display device with a touch detection function according to the second embodiment is mounted. FIG. 18 is a schematic diagram for explaining a relationship among drive electrodes, pixel signal lines, and pixels in a module in which the display device with a touch detection function according to the second embodiment is mounted. FIG. 19 is a schematic cross-sectional view illustrating the relationship among a drive electrode, a pixel signal line, and a pixel electrode in a module in which a display device with a touch detection function according to a modification of the second embodiment is mounted. FIG. 20 is a schematic diagram for explaining the relationship among drive electrodes, pixel signal lines, and pixels in a module in which a display device with a touch detection function according to a modification of the second embodiment is mounted. FIG. 21 is a diagram illustrating an example of a module in which the display device with a touch detection function according to the third embodiment is mounted. FIG. 22 is a schematic diagram illustrating the relationship between drive electrodes and pixel signal lines in a module in which the display device with a touch detection function according to the third embodiment is mounted. FIG. 23 is a schematic diagram illustrating the relationship between drive electrodes and pixel signal lines in a module in which the display device with a touch detection function according to the fourth embodiment is mounted. FIG. 24 is a diagram illustrating an example of an electronic apparatus to which the display device with a touch detection function according to the present embodiment is applied. FIG. 25 is a diagram illustrating an example of an electronic apparatus to which the display device with a touch detection function according to the present embodiment is applied. FIG. 26 is a diagram illustrating an example of an electronic apparatus to which the display device with a touch detection function according to the present embodiment is applied. FIG. 27 is a diagram illustrating an example of an electronic apparatus to which the display device with a touch detection function according to the present embodiment is applied. FIG. 28 is a diagram illustrating an example of an electronic apparatus to which the display device with a touch detection function according to the present embodiment is applied. FIG. 29 is a diagram illustrating an example of an electronic apparatus to which the display device with a touch detection function according to the present embodiment is applied. FIG. 30 is a diagram illustrating an example of an electronic apparatus to which the display device with a touch detection function according to the present embodiment is applied. FIG. 31 is a diagram illustrating an example of an electronic apparatus to which the display device with a touch detection function according to the present embodiment is applied. FIG. 32 is a diagram illustrating an example of an electronic apparatus to which the display device with a touch detection function according to the present embodiment is applied. FIG. 33 is a diagram illustrating an example of an electronic apparatus to which the display device with a touch detection function according to the present embodiment is applied. FIG. 34 is a diagram illustrating an example of an electronic apparatus to which the display device with a touch detection function according to the present embodiment is applied. FIG. 35 is a diagram illustrating an example of an electronic apparatus to which the display device with a touch detection function according to the present embodiment is applied.

A mode (embodiment) for carrying out the present disclosure will be described in detail with reference to the drawings. The present disclosure 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. The description will be given in the following order.
1. Embodiment (display device with touch detection function)
1-1. Embodiment 1
1-2. Embodiment 2
1-3. Embodiment 3
1-4. Embodiment 4
1-5. Other embodiments and modifications Application example (electronic equipment)
2. An example in which the display device with a touch detection function according to the embodiment is applied to an electronic device. Aspects of the present disclosure

<1. Embodiment>
<1-1. Embodiment 1>
[Configuration example]
(Overall configuration example)
FIG. 1 is a block diagram illustrating a configuration example of a display device with a touch detection function according to the first embodiment. The display device with a touch detection function 1 includes a display unit with a touch detection function 10, a control unit 11, a gate driver 12, a source driver 13, a source selector unit 13S, a drive electrode driver 14, and a drive signal selector unit 14S. And a touch detection unit 40. The display device with a touch detection function 1 is a display device in which the display unit with a touch detection function 10 has a touch detection function. The display unit 10 with a touch detection function is a so-called in-cell type device in which a liquid crystal display unit 20 using a liquid crystal display element as a display element and a capacitive touch detection device 30 are integrated. The display unit 10 with a touch detection function is a so-called on-cell type device in which a capacitive touch detection device 30 is mounted on a liquid crystal display unit 20 using a liquid crystal display element as a display element. May be.

  As will be described later, the liquid crystal display unit 20 is a device that performs scanning by sequentially scanning one horizontal line at a time in accordance with a scanning signal Vscan supplied from the gate driver 12. The control unit 11 supplies control signals to the gate driver 12, the source driver 13, the drive electrode driver 14, and the touch detection unit 40 based on the video signal Vdisp supplied from the outside, and these are synchronized with each other. The circuit is controlled to operate.

  The gate driver 12 has a function of sequentially selecting one horizontal line as a display driving target of the display unit 10 with a touch detection function based on a control signal supplied from the control unit 11.

  The source driver 13 is a circuit that supplies a pixel signal Vpix to each pixel Pix (sub-pixel SPix) described later of the display unit 10 with a touch detection function based on a control signal supplied from the control unit 11. As will be described later, the source driver 13 generates a pixel signal obtained by time-division multiplexing the pixel signals Vpix of the plurality of sub-pixels SPix of the liquid crystal display unit 20 from the video signal for one horizontal line, and sends it to the source selector unit 13S. Supply. The source driver 13 generates a switch control signal SEL necessary for separating the pixel signal Vpix multiplexed on the image signal Vsig, and supplies the switch control signal SEL together with the pixel signal Vpix to the source selector unit 13S. Note that the source selector unit 13S can reduce the number of wires between the source driver 13 and the control unit 11.

  The drive electrode driver 14 is a circuit that supplies a drive signal Vcom to a drive electrode COML (to be described later) of the display unit 10 with a touch detection function based on a control signal supplied from the control unit 11. The drive signal selector unit 14S selects a later-described drive electrode COML that supplies the drive signal Vcom in accordance with the switch control signal SELC generated by the drive electrode driver 14.

  The touch detection unit 40 touches the touch detection device 30 based on the control signal supplied from the control unit 11 and the touch detection signal Vdet supplied from the touch detection device 30 of the display unit 10 with a touch detection function (described above). This is a circuit that detects the presence or absence of a contact state and obtains the coordinates in the touch detection area when there is a touch. The touch detection unit 40 includes a touch detection signal amplification unit 42, an A / D conversion unit 43, a signal processing unit 44, a coordinate extraction unit 45, and a detection timing control unit 46.

  The touch detection signal amplification unit 42 amplifies the touch detection signal Vdet supplied from the touch detection device 30. The touch detection signal amplifying unit 42 may include a low-pass analog filter that removes a high frequency component (noise component) included in the touch detection signal Vdet, extracts the touch component, and outputs it.

(Basic principle of capacitive touch detection)
The touch detection device 30 operates based on the basic principle of capacitive touch detection and outputs a touch detection signal Vdet. With reference to FIGS. 1-6, the basic principle of the touch detection in the display apparatus 1 with a touch detection function of this embodiment is demonstrated. FIG. 2 is an explanatory diagram illustrating a state in which a finger is not in contact with or in proximity to the device in order to explain the basic principle of the capacitive touch detection method. FIG. 3 is an explanatory diagram showing an example of an equivalent circuit in a state where the finger shown in FIG. 2 is not in contact with or close to the device. FIG. 4 is an explanatory diagram illustrating a state in which a finger is in contact with or close to the device in order to explain the basic principle of the capacitive touch detection method. FIG. 5 is an explanatory diagram showing an example of an equivalent circuit in a state where the finger shown in FIG. 4 is in contact with or close to the apparatus.

  For example, as illustrated in FIG. 2, the capacitive element C <b> 1 includes a pair of electrodes, a drive electrode E <b> 1, and a touch detection electrode E <b> 2 that are disposed to face each other with the dielectric D interposed therebetween. As shown in FIG. 3, the capacitive element C1 has one end connected to an AC signal source (drive signal source) S and the other end connected to a voltage detector (touch detection unit) DET. The voltage detector DET is, for example, an integration circuit included in the touch detection signal amplification unit 42 illustrated in FIG.

  When an AC rectangular wave Sg having a predetermined frequency (for example, about several kHz to several hundred kHz) is applied from the AC signal source S to the drive electrode E1 (one end of the capacitive element C1), the touch detection electrode E2 (the other end of the capacitive element C1) An output waveform (touch detection signal Vdet) appears via the voltage detector DET connected to the side. The AC rectangular wave Sg corresponds to a touch drive signal Vcomt described later.

In a state where the finger is not in contact with (or close to) the device (non-contact state), as shown in FIG. 2 and FIG. I ₀ flows. As shown in FIG. 6, the voltage detector DET converts the fluctuation of the current I ₀ according to the AC rectangular wave Sg into the fluctuation of the voltage (solid line waveform V ₀ ).

On the other hand, when the finger is in contact with (or close to) the device (contact state), as shown in FIG. 4, the capacitance C2 formed by the finger is in contact with or near the touch detection electrode E2. The electrostatic capacitance corresponding to the fringe between the drive electrode E1 and the touch detection electrode E2 is blocked, and acts as a capacitive element C1 ′ having a capacitance value smaller than that of the capacitive element C1. When seen in the equivalent circuit shown in FIG. 5, the current I ₁ flows through the capacitor C1 '. As shown in FIG. 6, the voltage detector DET converts the fluctuation of the current I ₁ according to the AC rectangular wave Sg into the fluctuation of the voltage (dotted line waveform V ₁ ). In this case, the waveform V ₁ has a smaller amplitude than the waveform V ₀ described above. As a result, the absolute value | ΔV | of the voltage difference between the waveform V ₀ and the waveform V ₁ changes according to the influence of an adjacent object such as a finger from the outside. Note that the voltage detector DET accurately detects the absolute value | ΔV | of the voltage difference between the waveform V ₀ and the waveform V ₁ , so that the capacitance of the capacitor is adjusted according to the frequency of the AC rectangular wave Sg by switching in the circuit. It is more preferable to perform an operation provided with a period RESET for resetting charge / discharge.

  The touch detection device 30 shown in FIG. 1 performs touch detection by sequentially scanning one detection block at a time in accordance with a drive signal Vcom (touch drive signal Vcomt described later) supplied from the drive electrode driver 14.

  The touch detection device 30 outputs a touch detection signal Vdet for each detection block from a plurality of touch detection electrodes TDL described later via the voltage detector DET shown in FIG. 3 or FIG. The signal is supplied to the signal amplifier 42.

  The A / D converter 43 is a circuit that samples each analog signal output from the touch detection signal amplifier 42 and converts it into a digital signal at a timing synchronized with the touch drive signal Vcomt.

The signal processing unit 44 includes a digital filter that reduces frequency components (noise components) included in the output signal of the A / D conversion unit 43 other than the frequency obtained by sampling the touch drive signal Vcomt. The signal processing unit 44 is a logic circuit that detects the presence or absence of a touch on the touch detection device 30 based on the output signal of the A / D conversion unit 43. The signal processing unit 44 performs processing for extracting only the voltage difference by the finger. The difference in voltage by the finger is the absolute value | ΔV | of the difference between the waveform V ₀ and the waveform V ₁ described above. The signal processing unit 44 may perform an operation of averaging the absolute value | ΔV | per detection block to obtain an average value of the absolute value | ΔV |. Thereby, the signal processing unit 44 can reduce the influence of noise. The signal processing unit 44 compares the detected voltage difference by the finger with a predetermined threshold voltage, and if the voltage difference is equal to or greater than the threshold voltage, an external proximity object that is approaching from the outside is in contact. Judge. On the other hand, if the voltage difference is less than the threshold voltage, the signal processing unit 44 determines that the external proximity object is in a non-contact state. In this way, the touch detection unit 40 can perform touch detection.

  The coordinate extraction unit 45 is a logic circuit that calculates touch panel coordinates when a touch is detected by the signal processing unit 44. The detection timing control unit 46 controls the A / D conversion unit 43, the signal processing unit 44, and the coordinate extraction unit 45 to operate in synchronization. The coordinate extraction unit 45 outputs the touch panel coordinates as a signal output Vout.

(module)
FIG. 7 is a diagram illustrating an example of a module in which the display device with a touch detection function according to the first embodiment is mounted. As shown in FIG. 7, the display device 1 with a touch detection function includes a display unit 10 with a touch detection function, a drive electrode driver 14, and a COG (Chip On Glass) 19. The COG 19 includes the source driver 13 and the source selector unit 13S described above. The drive signal selector unit 14S is disposed at the same position as the drive electrode driver 14 although not shown. The drive electrode driver 14 is formed on a TFT substrate 21 that is a glass substrate. The COG 19 is a chip mounted on the TFT substrate 21 and incorporates each circuit necessary for display operation such as the control unit 11 and the source driver 13 shown in FIG. The display device with a touch detection function 1 may incorporate circuits such as the drive electrode driver 14 and the gate driver 12 in COG (Chip On Glass).

  FIG. 7 shows a scanning signal connected to the driving electrode COML and the gate driver 12 formed so as to cross the driving electrode COML in the display unit 10 with a touch detection function in a direction perpendicular to the surface of the TFT substrate 21. A line GCL is schematically shown. FIG. 7 shows the drive electrode COML and the pixel signal line formed so as to extend in a direction parallel to the drive electrode COML in the display unit 10 with a touch detection function in a direction perpendicular to the surface of the TFT substrate 21. SGL is schematically shown.

  The display unit 10 with a touch detection function is of a so-called landscape type (landscape). The drive electrode COML is formed in the long side direction of the display unit 10 with a touch detection function, and the touch detection electrode TDL described later is formed in the short side direction of the display unit 10 with a touch detection function. The output of the touch detection electrode TDL is provided on the short side of the display unit 10 with a touch detection function, and is connected to the touch detection unit 40 (mounted outside the module via a terminal unit T formed of a flexible substrate or the like. (Not shown).

  As described above, the display device with a touch detection function 1 illustrated in FIG. 7 outputs the touch detection signal Vdet from the short side of the display unit with a touch detection function 10. Thereby, the display device with a touch detection function 1 can easily route the wiring when connecting to the touch detection unit 40 via the terminal unit T.

(Display unit 10 with touch detection function)
Next, a configuration example of the display unit 10 with a touch detection function will be described in detail. FIG. 8 is a schematic diagram illustrating the relationship between drive electrodes and pixel signal lines in a module in which the display device with a touch detection function according to the first embodiment is mounted. FIG. 9 is a cross-sectional view illustrating a schematic cross-sectional structure of the display unit with a touch detection function according to the first embodiment. FIG. 10 is a circuit diagram illustrating a pixel array of the display unit with a touch detection function according to the first embodiment.

  As shown in FIG. 8, in the display device with a touch detection function 1, the pixel signal line SGL is connected to the source driver 13 built in the COG 19 via the source selector unit 13S. The source selector unit 13S opens and closes according to the switch control signal SEL. In the display device 1 with a touch detection function, the drive electrode COML is connected to the drive electrode driver 14 built in the COG 19. The color filter 32 includes color regions 32R, 32G, and 32B colored in three colors of red (R), green (G), and blue (B). The color filter 32 faces the drive electrode COML in the direction perpendicular to the TFT substrate 21 and overlaps when viewed in the direction perpendicular to the surface of the TFT substrate 21.

  For example, the drive electrode driver 14 supplies the drive signal Vcom only to the selected drive electrode block Stx, and does not supply the drive signal Vcom to the drive electrode block Ntx that is not selected.

  As shown in FIG. 9, the display unit 10 with a touch 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 thereof, and the pixel substrate 2 and the counter substrate 3. And a liquid crystal layer 6 interposed therebetween.

  The liquid crystal layer 6 modulates the light passing therethrough according to the state of the electric field. For example, a liquid crystal in a horizontal electric field mode such as an FFS (fringe field switching) mode or an IPS (in-plane switching) mode is used. A liquid crystal display unit 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.

  The counter substrate 3 includes a glass substrate 31 and a color filter 32 formed on one surface of the glass substrate 31. A touch detection electrode TDL, which is a detection electrode of the touch detection device 30, is formed on the other surface of the glass substrate 31, and a polarizing plate 35A is disposed on the touch detection electrode TDL.

  The pixel substrate 2 includes a TFT substrate 21 as a circuit substrate, a plurality of pixel electrodes 22 arranged in a matrix on the TFT substrate 21, and a plurality of drives formed between the TFT substrate 21 and the pixel electrodes 22. The electrode COML, the insulating layer 24 that insulates the pixel electrode 22 and the drive electrode COML, and the incident-side polarizing plate 35B on the lower surface side of the TFT substrate 21 are included.

  On the TFT substrate 21, a thin film transistor (TFT) element Tr of each sub-pixel SPix shown in FIG. 10, a pixel signal line SGL that supplies a pixel signal Vpix to each pixel electrode 22, and a scan that drives each TFT element Tr. Wirings such as signal lines GCL are formed. Thus, the pixel signal line SGL extends in a plane parallel to the surface of the TFT substrate 21 and supplies a pixel signal Vpix for displaying an image on the pixel. The liquid crystal display unit 20 shown in FIG. 10 has a plurality of subpixels SPix arranged in a matrix. The subpixel SPix includes a TFT element Tr and a liquid crystal element LC. The TFT element Tr is composed of a thin film transistor. In this example, the TFT element Tr is composed of an n-channel MOS (Metal Oxide Semiconductor) TFT. The source of the TFT element Tr is connected to the pixel signal line SGL, the gate is connected to the scanning signal line GCL, and the drain is connected to one end of the liquid crystal element LC. The liquid crystal element LC has one end connected to the drain of the TFT element Tr and the other end connected to the drive electrode COML.

  The sub-pixel SPix is connected to another sub-pixel SPix belonging to the same row of the liquid crystal display unit 20 by the scanning signal line GCL. The scanning signal line GCL is connected to the gate driver 12, and the scanning signal Vscan is supplied from the gate driver 12. The sub-pixel SPix is connected to another sub-pixel SPix belonging to the same column of the liquid crystal display unit 20 by the pixel signal line SGL. The pixel signal line SGL is connected to the source driver 13, and the pixel signal Vpix is supplied from the source driver 13. Further, the sub-pixel SPix is connected to another sub-pixel SPix belonging to the same column of the liquid crystal display unit 20 by the drive electrode COML. The drive electrode COML is connected to the drive electrode driver 14, and a drive signal Vcom is supplied from the drive electrode driver 14. That is, in this example, a plurality of subpixels SPix belonging to the same column share one drive electrode COML.

  The gate driver 12 shown in FIG. 1 forms a matrix in the liquid crystal display unit 20 by applying the scanning signal Vscan to the gate of the TFT element Tr of the subpixel SPix via the scanning signal line GCL shown in FIG. One row (one horizontal line) among the sub-pixels SPix being selected is sequentially selected as a display drive target. The source driver 13 shown in FIG. 1 supplies the pixel signal Vpix to each subpixel SPix constituting one horizontal line sequentially selected by the gate driver 12 via the pixel signal line SGL shown in FIG. In these sub-pixels SPix, one horizontal line is displayed in accordance with the supplied pixel signal Vpix. The drive electrode driver 14 shown in FIG. 1 applies the drive signal Vcom, and drives the drive electrode COML for each drive electrode block including a predetermined number of drive electrodes COML shown in FIGS.

  As described above, in the liquid crystal display unit 20, one horizontal line is sequentially selected by driving the gate driver 12 to scan the scanning signal lines GCL in a time-division manner. In the liquid crystal display unit 20, the source driver 13 supplies the pixel signal Vpix to the subpixels SPix belonging to one horizontal line, so that display is performed for each horizontal line. When performing this display operation, the drive electrode driver 14 applies the drive signal Vcom to the drive electrode block including the drive electrode COML corresponding to the one horizontal line.

  The color filter 32 shown in FIG. 9 is shown in FIG. 10 described above by periodically arranging color regions of color filters colored in, for example, red (R), green (G), and blue (B). Each sub-pixel SPix is associated with three color regions 32R, 32G, and 32B (see FIG. 8) of R, G, and B as a pixel Pix. The color filter 32 faces the liquid crystal layer 6 in a direction perpendicular to the TFT substrate 21. The color filter 32 may be a combination of other colors as long as they are colored in different colors.

  The drive electrode COML according to the present embodiment functions as a drive electrode of the liquid crystal display unit 20 and also functions as a drive electrode of the touch detection device 30. FIG. 11 is a schematic cross-sectional view illustrating the relationship among the drive electrode, the pixel signal line, and the pixel electrode in the module in which the display device with a touch detection function according to the first embodiment is mounted. FIG. 12 is a schematic diagram for explaining the relationship among drive electrodes, pixel signal lines, and pixels in the module in which the display device with a touch detection function according to the first embodiment is mounted. FIG. 13 is a perspective view illustrating a configuration example of drive electrodes and touch detection electrodes of the display unit with a touch detection function according to the first embodiment. As shown in FIG. 11, the drive electrode COML faces the pixel electrode 22 in the direction perpendicular to the surface of the TFT substrate 21. As shown in FIGS. 11 and 12, one drive electrode COML is arranged so as to correspond to three pixel electrodes 22 (pixel electrodes 22 constituting three columns). The insulating layer 24 insulates the pixel electrode 22 and the drive electrode COML, and insulates the pixel electrode 22 and the pixel signal line SGL formed on the surface of the TFT substrate 21.

  As shown in FIG. 12, the drive electrode COML extends in a direction parallel to the direction in which the pixel signal line SGL extends. The drive electrode COML is configured such that an AC rectangular waveform drive signal Vcom is applied from the drive electrode driver 14 to the drive electrode COML via a conductive contact column having conductivity (not shown). In the pixel Pix, the color regions 32R, 32G, and 32B of R, G, and B are assigned to the sub-pixels SPix illustrated in FIG. 10 described above. As shown in FIG. 12, a gap between adjacent drive electrodes COML is located between adjacent pixels Pix. In this way, the drive electrode COML is arranged in parallel for each pixel Pix that includes the red (R) color region 32R, the green (G) color region 32G, and the blue (B) color region 32B of the color filter 32. It extends to. Thereby, since the gaps between the adjacent drive electrodes COML are periodically arranged in units of pixels Pix, it is possible to reduce the possibility that a streak associated with the gap between the adjacent drive electrodes COML will be recognized by humans.

  In general, in the color filter 32, the luminance of the green (G) color region 32G is higher than the luminance of the red (R) color region 32R and the blue (B) color region 32B. The drive electrode COML is a transparent electrode formed of a transparent conductive material (transparent conductive oxide) such as ITO (Indium Tin Oxide). The drive electrode COML is transparent, but a gap between adjacent drive electrodes COML is easily recognized by human eyes as a streak. For this reason, in the display device with a touch detection function 1 according to the first embodiment, between the red (R) color region 32R and the blue (B) color region 32B having relatively low luminance, the adjacent drive electrodes COML are arranged. There is a gap. Thereby, since the gaps between the adjacent drive electrodes COML are periodically arranged in units of pixels Pix, it is possible to reduce the possibility that a streak associated with the gap between the adjacent drive electrodes COML will be recognized by humans. In the display device 1 with a touch detection function according to the first embodiment, the aperture ratio of the green (G) color region 32G having a higher luminance than the red (R) color region 32R and the blue (B) color region 32B is obtained. Maintained.

  FIG. 13 is a perspective view illustrating a configuration example of the touch detection device 30. FIG. 14 is a schematic diagram illustrating an operation example of the drive electrode driver according to the first embodiment. The touch detection device 30 includes a drive electrode COML and a touch detection electrode TDL. The drive electrode COML is composed of a plurality of striped electrode patterns extending in one direction. When the touch detection operation is performed, a drive signal Vcom is sequentially supplied to each electrode pattern by the drive electrode driver 14, and line-sequential scanning drive is performed in a time-division manner as will be described later. The touch detection electrode TDL includes a striped electrode pattern extending in a direction intersecting with the extending direction of the electrode pattern of the drive electrode COML. The touch detection electrode TDL faces the drive electrode COML in a direction perpendicular to the surface of the TFT substrate 21. Each electrode pattern of the touch detection electrode TDL is connected to an input of the analog LPF unit 42 of the touch detection unit 40. The electrode pattern in which the drive electrode COML and the touch detection electrode TDL intersect each other generates capacitance at the intersection.

  With this configuration, in the touch detection device 30, when performing the touch detection operation, the drive electrode driver 14 is driven to sequentially scan in a time-division manner using the drive electrode COML as the drive electrode block. Thereby, one detection block of the drive electrode COML is sequentially selected in the scan direction Scan, and the touch detection device 30 outputs the touch detection signal Vdet from the touch detection electrode TDL. As described above, the touch detection device 30 is configured to perform touch detection of one detection block. In the touch detection device 30, each of the drive electrode block Tx1 to the drive electrode block Txi shown in FIG. 14 corresponds to the drive electrode E1 in the basic principle of touch detection described above. In the touch detection device 30, each of the detection blocks Rx1 to Rxq of the touch detection electrode TDL corresponds to the touch detection electrode E2. The touch detection device 30 detects a touch according to the basic principle described above. And as shown in FIG. 13, the electrode pattern which carried out the three-dimensional intersection mutually comprises the electrostatic capacitance type touch sensor in the matrix form. Therefore, by scanning the entire touch detection surface of the touch detection device 30, it is possible to detect the position where the contact or proximity of the external proximity object has occurred.

  Here, the TFT substrate 21 corresponds to a specific example of “substrate” in the present disclosure. The pixel electrode 22 corresponds to a specific example of “pixel electrode” in the present disclosure. The pixel signal line SGL corresponds to a specific example of “signal line” in the present disclosure. The drive electrode COML corresponds to a specific example of “drive electrode” in the present disclosure. The liquid crystal element LC corresponds to a specific example of “display function layer” in the present disclosure. The source driver 13 and the drive electrode driver 14 correspond to a specific example of “scan driver” in the present disclosure. The touch detection electrode TDL corresponds to a “touch detection electrode” in the present disclosure. The color filter 32 corresponds to a “color filter” in the present disclosure.

[Operation and action]
Next, the operation and action of the display device with a touch detection function 1 according to the first embodiment will be described. FIG. 15 is a schematic diagram illustrating the relationship between the display operation period and the touch detection operation period according to the first embodiment.

  Since the drive electrode COML functions as a drive electrode of the liquid crystal display unit 20 and also functions as a drive electrode of the touch detection device 30, the drive signals Vcom may influence each other. For this reason, the drive signal Vcom is applied to the drive electrode COML in the display operation period Pd in which the display operation is performed and the touch detection operation period Pt in which the touch detection operation is performed. The drive electrode driver 14 applies the drive signal Vcom as a display drive signal during the display operation period Pd in which the display operation is performed. The drive electrode driver 14 applies the drive signal Vcom as a touch drive signal during the touch detection operation period Pt in which the touch detection operation is performed. In the following description, the drive signal Vcom as a display drive signal may be described as a display drive signal Vcomd, and the drive signal Vcom as a touch detection drive signal may be described as a touch drive signal Vcomt.

(Overview of overall operation)
The control unit 11 supplies control signals to the gate driver 12, the source driver 13, the drive electrode driver 14, and the touch detection unit 40 based on the video signal Vdisp supplied from the outside, and these are synchronized with each other. And control to work. In the display operation period Pd shown in FIG. 15, the gate driver 12 supplies the scanning signal Vscan to the liquid crystal display unit 20 and sequentially selects one horizontal line to be displayed. The source driver 13 supplies the pixel signal Vpix to each pixel Pix constituting one horizontal line selected by the gate driver 12 in the display operation period Pd.

  The drive electrode driver 14 applies the display drive signal Vcomd from the drive electrode block Tx1 related to one horizontal line to the drive electrode block Txi in the display operation period Pd. In the touch detection operation period Pt, the touch drive signal Vcomt having a frequency higher than the display drive signal Vcomd is sequentially applied to the drive electrode block Tx1 related to the touch detection operation, and one detection block is sequentially selected. The display unit with a touch detection function 10 performs a display operation based on signals supplied from the gate driver 12, the source driver 13, and the drive electrode driver 14 in the display operation period Pd. The display unit with a touch detection function 10 performs a touch detection operation based on the touch drive signal Vcomt supplied by the drive electrode driver 14 in the touch detection operation period Pt, and outputs the touch detection signal Vdet from the touch detection electrode TDL. The touch detection signal amplifier 42 amplifies and outputs the touch detection signal Vdet. The A / D conversion unit 43 converts the analog signal output from the touch detection signal amplification unit 42 into a digital signal at a timing synchronized with the touch drive signal Vcomt. The signal processing unit 44 detects the presence or absence of a touch on the touch detection device 30 based on the output signal of the A / D conversion unit 43. When the signal processing unit 44 detects touch in the signal processing unit 44, the coordinate extracting unit 45 obtains the touch panel coordinates and outputs the touch panel coordinates as a signal output Vout.

(Detailed operation)
Next, detailed operation of the display device with a touch detection function 1 will be described. In accordance with the scanning signal Vscan supplied from the gate driver 12, the liquid crystal display unit 20 performs scanning by sequentially scanning adjacent scanning signal lines GCL among the scanning signal lines GCL one horizontal line at a time. Similarly, the drive electrode driver 14 is based on the control signal supplied from the control unit 11 and is adjacent to the drive electrode block Tx1 column shown in FIG. 14 in the drive electrodes COML of the display unit 10 with a touch detection function. The drive signal Vcom is supplied to the drive electrode COML in the order of the drive electrode block Tx 2nd row,..., The drive electrode block Txi row.

  In the display device 1 with a touch detection function, a drive signal is applied to the drive electrodes COML in a time-divided manner, divided into a touch detection operation (touch detection operation period Pt) and a display operation (display period Pd) for each display horizontal period 1SF. Vcom (display drive signal Vcomd and touch drive signal Vcomt) is supplied. The frame period 1F is a period that elapses when all horizontal lines on the display surface of the liquid crystal display unit 20 to be subjected to display driving are selected. As shown in FIGS. 14 and 15, in the touch detection operation, after the lapse of the frame period 1F, a different drive electrode COML in the drive electrode block Txi is selected from the drive electrode block Tx1 for each display horizontal period 1SF, and the touch drive signal is selected. A touch detection scan is performed by applying a rectangular wave of Vcomt.

  For example, as shown in FIG. 14, in the second one display horizontal period 1SF, the drive electrode block Tx2 among the drive electrode blocks Tx1 to Txi becomes the selected drive electrode block Stx, as shown in FIG. In addition, the rectangular wave of the touch drive signal Vcomt is supplied in the second touch detection operation period Pt. At this time, the drive signal selector unit 14S shown in FIG. 8 responds to the switch control signal SEL to both the drive electrode COML serving as the drive electrode block Stx and the pixel signal line SGL facing in the direction perpendicular to the substrate. In addition, a rectangular wave having the same touch drive signal Vcomt is supplied.

  The drive electrode block Tx1 and the drive electrode blocks Tx3 to Txi are not selected drive electrode blocks Ntx, and the potential of the drive electrode COML of the unselected drive electrode block Ntx is fixed to GND. In addition, the potential of the drive electrode COML serving as the drive electrode block Ntx and the pixel signal line SGL facing the direction perpendicular to the substrate is also fixed to GND.

  This operation is sequentially repeated from the drive electrode block Tx1 to the drive electrode block Txi, as shown in FIG. Accordingly, the display device with a touch detection function 1 performs a display operation by scanning the entire display surface, and performs a touch detection operation by scanning the entire touch detection surface.

  As described above, the display device with a touch detection function 1 applies the display drive signal Vcomd to the drive electrode COML during the display period pd and displays an image on the pixel electrode on the pixel signal line SGL. A pixel signal Vpix is supplied. The display device with a touch detection function 1 applies the touch drive signal Vcomt to the drive electrode COML during the touch detection operation period pt, and overlaps the drive electrode COML to which the touch drive signal Vcomt is applied in the above-described vertical direction. In this way, the touch drive signal Vcomt is supplied to the opposing pixel signal lines SGL. In the touch detection operation period pt, when the drive electrode COML and the pixel signal line SGL cross three-dimensionally, the parasitic capacitance between the drive electrode COML and the pixel signal line SGL increases, and it takes time to charge and discharge the drive electrode COML. May take. As shown in FIG. 12, the drive electrode COML of Embodiment 1 extends in a direction parallel to the direction in which the pixel signal line SGL extends. For this reason, the drive electrode driver 14 has the same rectangular shape of the touch drive signal Vcomt for both the drive electrode COML to which the touch drive signal Vcomt is applied and the pixel signal line SGL that overlaps in the direction perpendicular to the drive electrode COML and the TFT substrate 21. Can supply waves. As a result, in the display device with a touch detection function 1, the parasitic capacitance between the drive electrode COML and the pixel signal line SGL is reduced by about 50%.

[effect]
As described above, the display device with a touch detection function 1 can suppress the power consumption of the touch detection when the parasitic capacitance between the drive electrode COML and the pixel signal line SGL is suppressed. For this reason, since the electric power supplied to the touch detection part 40 can be suppressed, a driver IC can be reduced in size. As a result, the electronic device including the display device with a touch detection function 1 according to the first embodiment can be reduced in size.

  In addition, the display device with a touch detection function 1 according to the first embodiment can suppress the influence of charging and discharging when the parasitic capacitance between the drive electrode COML and the pixel signal line SGL is suppressed. For this reason, the frequency of the rectangular wave of the touch drive signal Vcomt can be increased. As a result, the display device with a touch detection function 1 according to the first embodiment can suppress the influence of low frequency noise caused by the AC power supply. In addition, the display device with a touch detection function 1 according to the first embodiment increases the frequency of the rectangular wave of the touch drive signal Vcomt supplied to the drive electrode COML, and can detect touch detection in a short time. As a result, the display device with a touch detection function 1 according to the first embodiment can cope with the touch detection device 30 even if the area of the touch detection device 30 is increased in screen size or resolution. Further, the display device with a touch detection function 1 according to the first embodiment can reduce the parasitic capacitance between the drive electrode COML and the pixel signal line SGL even when the distance between the drive electrode COML and the pixel signal line SGL is shortened. Therefore, the display unit 10 with a touch detection function can be thinned.

[Modification of Embodiment 1]
FIG. 16 is a schematic diagram for explaining the relationship among drive electrodes, pixel signal lines, and pixels in a module in which a display device with a touch detection function according to a modification of the first embodiment is mounted. As described above, the drive electrode COML is transparent, but the gap between adjacent drive electrodes COML is easily recognized by human eyes as a streak. For this reason, the display device with a touch detection function 1 according to the modification of the first embodiment drives adjacently between the red (R) color region 32R and the blue (B) color region 32B having relatively low luminance. A gap between the electrodes COML is located. For this reason, the aperture ratio of the red (R) color region 32R and the blue (B) color region 32B may be reduced. For example, in the display device 1 with a touch detection function according to the modification of the first embodiment, as illustrated in FIG. 16, pixel signal lines between a red (R) color region 32R and a blue (B) color region 32B. The length between the SGLs is Ls, and the length of the width orthogonal to the extending direction of the drive electrode COML is Lc. As shown in FIG. 16, the display device 1 with a touch detection function according to the modification of the first embodiment has a red (R) color filter 32 of the color filter 32 as viewed in the direction perpendicular to the surface of the TFT substrate 21 described above. The length between the pixel signal lines SGL arranged via the sub-pixel SPix shown in FIG. 10 that overlaps the color region 32R, the green (G) color region 32G, and the blue (B) color region 32B is set to a width Δr. , Width Δg and width Δb.

  A gap between the adjacent drive electrodes COML is located between the red (R) color region 32R and the blue (B) color region 32B having relatively low luminance. Therefore, the aperture ratio of the green (G) color region 32G having higher luminance than the red (R) color region 32R and the blue (B) color region 32B is maintained. The aperture ratios of the red (R) color region 32R and the blue (B) color region 32B can be improved by making the width Δr and the width Δb larger than the width Δg. In the display device 1 with a touch detection function according to the modification of the first embodiment, the red (R) color region 32R and the blue (B) color region 32B of the color filter 32 sandwich the green (G) color region 32G. The widths in the direction orthogonal to the extending direction of the red (R) color region 32R and the blue (B) color region 32B are the same as the extending direction of the green (G) color region 32G. It becomes narrower than the width in the orthogonal direction. Accordingly, the display device with a touch detection function 1 according to the modification of the first embodiment has the color regions 32R and 32G of the color filter 32 colored in three colors of red (R), green (G), and blue (B). And the transmittance of 32B can be made equal. For example, the width Δr and the width Δb can be made larger than the width Δg by ((length Ls−length Lc) / 2).

  In the display device with a touch detection function 1 according to the modification of the first embodiment, the lengths of the gaps between the adjacent drive electrodes COML are periodically arranged in units of pixels Pix. The possibility that a streak associated with the gap is recognized by a human can be reduced.

<1-2. Second Embodiment>
Next, the display device 1 with a touch detection function according to the second embodiment will be described. FIG. 17 is a schematic cross-sectional view illustrating the relationship among drive electrodes, pixel signal lines, and pixel electrodes in a module in which the display device with a touch detection function according to the second embodiment is mounted. FIG. 18 is a schematic diagram for explaining a relationship among drive electrodes, pixel signal lines, and pixels in a module in which the display device with a touch detection function according to the second embodiment is mounted. In addition, the same code | symbol is attached | subjected to the same component as what was demonstrated in Embodiment 1 mentioned above, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 17, the drive electrode COML faces the pixel electrode 22 in the direction perpendicular to the surface of the TFT substrate 21. As shown in FIGS. 17 and 18, one drive electrode COML is arranged so as to correspond to three pixel electrodes 22 (pixel electrodes 22 constituting three columns).

  Further, as shown in FIG. 18, the drive electrode COML extends in a direction parallel to the direction in which the pixel signal line SGL extends. In the pixel Pix, the color regions 32R, 32G, and 32B of R, G, and B are assigned to the sub-pixels SPix illustrated in FIG. 10 described above. As shown in FIG. 18, a gap between adjacent drive electrodes COML is located between adjacent pixels Pix. A metal auxiliary wiring ML is arranged in the insulating layer 24 between the gap between the adjacent drive electrodes COML and the pixel signal line SGL facing in the direction perpendicular to the gap and the surface of the TFT substrate 21. The metal auxiliary wiring ML extends in a direction parallel to the direction in which the pixel signal line SGL extends. The metal auxiliary wiring ML and the drive electrode COML are applied such that the drive signal Vcom having an AC rectangular waveform is applied from the drive electrode driver 14 to the drive electrode COML and the metal auxiliary wiring ML via a conductive contact column having conductivity (not shown). It has become.

  When the rectangular wave of the same touch drive signal Vcomt is supplied to the drive electrode COML and the pixel signal line SGL, the potential of the metal auxiliary wiring ML becomes the same as that of the drive electrode COML and the pixel signal line SGL, so that the liquid crystal layer 6 The potential change to the is suppressed, and the transmission loss is reduced.

[Modification of Embodiment 2]
FIG. 19 is a schematic cross-sectional view illustrating the relationship among a drive electrode, a pixel signal line, and a pixel electrode in a module in which a display device with a touch detection function according to a modification of the second embodiment is mounted. FIG. 20 is a schematic diagram for explaining the relationship among drive electrodes, pixel signal lines, and pixels in a module in which a display device with a touch detection function according to a modification of the second embodiment is mounted. In addition, the same code | symbol is attached | subjected to the same component as what was demonstrated in Embodiment 1 mentioned above, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 19, the drive electrode COML faces the pixel electrode 22 in the direction perpendicular to the surface of the TFT substrate 21. As shown in FIGS. 19 and 20, one drive electrode COML is arranged so as to correspond to three pixel electrodes 22 (pixel electrodes 22 constituting three columns).

  As shown in FIG. 20, the drive electrode COML extends in a direction parallel to the direction in which the pixel signal line SGL extends. In the pixel Pix, the color regions 32R, 32G, and 32B of R, G, and B are assigned to the sub-pixels SPix illustrated in FIG. 10 described above. As shown in FIG. 20, a gap between adjacent drive electrodes COML is located between adjacent pixels Pix. A metal auxiliary wiring ML is stacked on the edge of the drive electrode COML near the gap between the adjacent drive electrodes COML. The metal auxiliary wiring ML extends in a direction parallel to the direction in which the pixel signal line SGL extends. The metal auxiliary wiring ML opposes one of the pixel signal lines SGL in a direction perpendicular to the surface of the TFT substrate 21. The metal auxiliary wiring ML and the drive electrode COML are applied such that the drive signal Vcom having an AC rectangular waveform is applied from the drive electrode driver 14 to the drive electrode COML and the metal auxiliary wiring ML via a conductive contact column having conductivity (not shown). It has become.

  When the rectangular wave of the same touch drive signal Vcomt is supplied to the drive electrode COML and the pixel signal line SGL, the potential of the metal auxiliary wiring ML becomes the same as that of the drive electrode COML and the pixel signal line SGL, so that the liquid crystal layer 6 The potential change to the is suppressed, and the transmission loss is reduced. Further, the metal auxiliary wiring ML can use one or more of metals, aluminum (Al), copper (Cu), gold (Au), and alloys thereof having a lower resistance than that of the drive electrode COML. For this reason, the display device with a touch detection function 1 according to the modification of the second embodiment is less susceptible to the voltage drop of the drive electrode COML, and can cope with an increase in the size of the screen.

[effect]
As described above, in the display device with a touch detection function 1 according to the second embodiment and the modification, the parasitic capacitance between the drive electrode COML and the pixel signal line SGL is suppressed. Thereby, the display device with a touch detection function 1 can suppress the power consumption of the touch detection. For this reason, since the electric power supplied to the touch detection part 40 can be suppressed, a driver IC can be reduced in size. As a result, the electronic device including the display device with a touch detection function 1 according to the second embodiment and the modification can be reduced in size.

  Further, in the display device with a touch detection function 1 according to the second embodiment and the modification example, when the parasitic capacitance among the metal auxiliary wiring ML, the drive electrode COML, and the pixel signal line SGL is suppressed, the influence of charging / discharging. Can be suppressed. For this reason, the frequency of the rectangular wave of the touch drive signal Vcomt can be increased. As a result, the display device with a touch detection function 1 according to the second embodiment and the modification can suppress the influence of low frequency noise caused by the AC power supply. In addition, the display device with a touch detection function 1 according to the second embodiment and the modification can increase the frequency of the rectangular wave of the touch drive signal Vcomt supplied to the metal auxiliary wiring ML and the drive electrode COML, and can detect touch detection in a short time. It becomes like this. Thereby, the display device with a touch detection function 1 according to the second embodiment and the modification example can cope with the touch detection device 30 even if the area of the touch detection device 30 is increased in screen size or resolution. In addition, the display device with a touch detection function 1 according to the second embodiment and the modification has a parasitic capacitance between the drive electrode COML and the pixel signal line SGL even when the distance between the drive electrode COML and the pixel signal line SGL is short. Therefore, the display unit with a touch detection function 10 can be thinned.

<1-3. Embodiment 3>
Next, a display device with a touch detection function 1A according to Embodiment 3 will be described. FIG. 21 is a diagram illustrating an example of a module in which the display device with a touch detection function according to the third embodiment is mounted. FIG. 22 is a schematic diagram illustrating the relationship between drive electrodes and pixel signal lines in a module in which the display device with a touch detection function according to the third embodiment is mounted. In addition, the same code | symbol is attached | subjected to the same component as what was demonstrated in Embodiment 1 and Embodiment 2 mentioned above, and the overlapping description is abbreviate | omitted.

  FIG. 21 is connected to the drive electrode COML and the gate driver 12 formed to three-dimensionally intersect the drive electrode COML in the display unit 10 with a touch detection function in a direction perpendicular to the surface of the TFT substrate 21 described above. A scanning signal line GCL is schematically shown. FIG. 21 shows the drive electrode COML and the pixel signal line formed so as to extend in a direction parallel to the drive electrode COML in the display unit 10 with a touch detection function in a direction perpendicular to the surface of the TFT substrate 21. SGL is schematically shown. The drive signal selectors 14S1 and 14S2 are arranged so as to sandwich both ends in the extending direction of the drive electrode COML.

  As shown in FIG. 22, in the display device with a touch detection function 1A, the pixel signal line SGL is connected to the source driver 13 built in the COG 19 via the source selector sections 13S1 and 13S2. The source selector sections 13S1 and 13S2 are arranged so as to sandwich both ends of the pixel signal line SGL in the extending direction. The source selector unit 13S1 opens and closes according to the switch control signal SELC. The source selector unit 13S2 opens and closes according to the switch control signal SEL. The drive signal selector unit 14S1 and the drive signal selector unit 14S2 on the COG 19 side including the drive electrode driver 14 are arranged so as to sandwich both ends in the extending direction of the drive electrode COML. The drive signal selector units 14S1 and 14S2 open and close according to the switch control signal SELC. The display device with a touch detection function 1A according to the third embodiment includes a drive electrode signal line selector switch SW that opens and closes an electrical connection between the drive electrode COML and the pixel signal line SGL according to the switch control signal SELC. Yes. In the display device with a touch detection function 1 </ b> A, the drive electrode COML is connected to the drive electrode driver 14 built in the COG 19. The color filter 32 includes color regions 32R, 32G, and 32B colored in three colors of red (R), green (G), and blue (B). The color filter 32 faces the drive electrode COML in the direction perpendicular to the TFT substrate 21 and overlaps when viewed in the direction perpendicular to the surface of the TFT substrate 21.

  As illustrated in FIG. 22, the drive electrode COML of Embodiment 3 extends in a direction parallel to the direction in which the pixel signal line SGL extends. For example, in the display device with a touch detection function 1A, in the display period pd, the drive electrode signal line selector switch SW disconnects the drive electrode COML and the pixel signal line SGL in response to the switch control signal SELC, and the drive electrode COML is connected. On the other hand, the display drive signal Vcomd is applied. In the display device with a touch detection function 1A, in the display period pd, one of the source selector units 13S1 and 13S2 opens according to the switch control signal SELC, and the other of the source selector units 13S1 and 13S2 becomes the switch control signal SEL. The pixel signal Vpix for displaying an image on the pixel electrode is supplied to the pixel signal line SGL by performing an opening / closing operation accordingly. Thereby, the source selector units 13S1 and 13S2 can suppress a short circuit of the pixel signal line SGL.

  In the display device with a touch detection function 1A, the drive electrode signal line selector switch SW connects the drive electrode COML and the pixel signal line SGL according to the switch control signal SELC in the touch detection operation period pt. The display device with a touch detection function 1A applies the touch drive signal Vcomt to the drive electrode COML, and the pixel signal lines facing the drive electrode COML to which the touch drive signal Vcomt is applied so as to overlap in the vertical direction described above. A touch drive signal Vcomt is supplied to SGL. Therefore, the drive electrode driver 14 can supply the same rectangular wave of the touch drive signal Vcomt to the drive electrode COML and the pixel signal line SGL from both ends in the extending direction of the drive electrode COML and the pixel signal line SGL.

[effect]
As described above, the display device with a touch detection function 1A according to the third embodiment has the same touch drive signal Vcomt applied to the drive electrode COML and the pixel signal line SGL from both ends in the extending direction of the drive electrode COML and the pixel signal line SGL. Since the rectangular wave is supplied, the voltage drop can be suppressed, and the display unit 10 with a touch detection function can be enlarged or increased in definition.

<1-4. Embodiment 4>
Next, a display device 1B with a touch detection function according to the fourth embodiment will be described. FIG. 23 is a schematic diagram illustrating the relationship between drive electrodes and pixel signal lines in a module in which the display device with a touch detection function according to the fourth embodiment is mounted. In addition, the same code | symbol is attached | subjected to the same component as what was demonstrated in Embodiment 1 and Embodiment 2 mentioned above, and the overlapping description is abbreviate | omitted.

  FIG. 23 is connected to the drive electrode COML and the gate driver 12 formed to three-dimensionally intersect the drive electrode COML in the display unit with a touch detection function 10 in the direction perpendicular to the surface of the TFT substrate 21 described above. A scanning signal line GCL is schematically shown. FIG. 23 shows the drive electrode COML and the pixel signal line formed to extend in a direction parallel to the drive electrode COML in the display unit 10 with a touch detection function in a direction perpendicular to the surface of the TFT substrate 21. SGL is schematically shown.

  As shown in FIG. 23, in the display device with a touch detection function 1B, the pixel signal line SGL is connected to the source driver 13 built in the COG 19 via the source selector unit 13S. The source selector unit 13S opens and closes according to the switch control signal SEL. The drive signal selector unit 14S also opens and closes according to the switch control signal SELC. The display device 1B with a touch detection function according to the fourth embodiment includes a drive electrode signal line selector switch SW that opens and closes an electrical connection between the drive electrode COML and the pixel signal line SGL according to the switch control signal SELC. Yes. In the display device with a touch detection function 1 </ b> B, the drive electrode COML is connected to the drive electrode driver 14 built in the COG 19. The color filter 32 includes color regions 32R, 32G, and 32B colored in three colors of red (R), green (G), and blue (B). The color filter 32 faces the drive electrode COML in the direction perpendicular to the TFT substrate 21 and overlaps when viewed in the direction perpendicular to the surface of the TFT substrate 21.

  In the drive electrode COML of the fourth embodiment, as illustrated in FIG. 23, the drive electrode COML extends in a direction parallel to the direction in which the pixel signal line SGL extends. For example, the display device with a touch detection function 1 </ b> B drives the drive electrode signal line selector switch SW in accordance with the switch control signal SELC to disconnect the drive electrode COML and the pixel signal line SGL in the display period pd. A display drive signal Vcomd is applied to the electrode COML, and a pixel signal Vpix for displaying an image on the pixel electrode is supplied to the pixel signal line SGL. In the touch detection operation period pt, the display device with a touch detection function 1 </ b> B drives the drive electrode signal line selector switch SW according to the switch control signal SELC to connect the drive electrode COML and the pixel signal line SGL. The display device with a touch detection function 1B applies the touch drive signal Vcomt to the drive electrode COML, and the pixel signal lines facing the drive electrode COML to which the touch drive signal Vcomt is applied so as to overlap in the vertical direction described above. A touch drive signal Vcomt is supplied to the SGL. For this reason, the drive electrode driver 14 can supply the rectangular wave of the same touch drive signal Vcomt to the drive electrode COML and the pixel signal line SGL.

[effect]
As described above, the display device with a touch detection function 1B according to the fourth embodiment can suppress the power consumption of the touch detection when the parasitic capacitance between the drive electrode COML and the pixel signal line SGL is suppressed. For this reason, since the electric power supplied to the touch detection part 40 can be suppressed, a driver IC can be reduced in size. As a result, an electronic apparatus including the display device with a touch detection function 1B according to the fourth embodiment can be reduced in size.

  In addition, the display device with a touch detection function 1 </ b> B according to the fourth embodiment can suppress the influence of charging and discharging when the parasitic capacitance between the drive electrode COML and the pixel signal line SGL is suppressed. For this reason, the frequency of the rectangular wave of the touch drive signal Vcomt can be increased. As a result, the display device with a touch detection function 1 </ b> B according to the fourth embodiment can suppress the influence of low frequency noise caused by the AC power supply. In addition, the display device with a touch detection function 1B according to the fourth embodiment increases the frequency of the rectangular wave of the touch drive signal Vcomt supplied to the drive electrode COML, and can detect touch detection in a short time. Thereby, the display device with a touch detection function 1B according to the fourth embodiment can cope with the touch detection device 30 even if the area of the touch detection device 30 is increased in screen size or resolution. Further, the display device with a touch detection function 1B according to the fourth embodiment can reduce the parasitic capacitance between the drive electrode COML and the pixel signal line SGL even when the distance between the drive electrode COML and the pixel signal line SGL is shortened. Therefore, the display unit 10 with a touch detection function can be thinned.

<1-5. Other Embodiments and Modifications>
As described above, the embodiments have been described with some embodiments and modifications, but the present disclosure is not limited to these embodiments and the like, and various modifications are possible.

  In the display devices 1 and 1A with a touch detection function according to the above embodiments and modifications, the liquid crystal display unit 20 and the touch detection device 30 using liquid crystal in various modes such as the FFS mode and the IPS mode are integrated. The display unit with a touch detection function can be used. Instead of this, the display unit 10 with a touch detection function includes various modes such as a TN (Twisted Nematic) mode, a VA (Vertical Alignment) mode, and an ECB (Electrically Controlled Birefringence) mode. A display unit with a touch detection function in which the liquid crystal and the touch detection device are integrated.

  For example, the display devices 1 and 1A with a touch detection function may use a liquid crystal in a horizontal electric field mode. In each of the above embodiments, the so-called in-cell type in which the liquid crystal display unit 20 and the capacitive touch detection device 30 are integrated is not limited to this, and instead of this, for example, a liquid crystal An on-cell type in which a capacitive touch detection device 30 is mounted on the display unit 20 may be used. Even in this case, with the configuration described above, touch detection can be performed while suppressing the influence of external noise and noise transmitted from the liquid crystal display unit (corresponding to internal noise in each of the above embodiments).

<2. Application example>
Next, an application example of the display device with a touch detection function 1 described in the embodiment and the modification will be described with reference to FIGS. FIGS. 24-35 is a figure which shows an example of the electronic device to which the display apparatus with a touch detection function which concerns on this embodiment is applied. The display device with a touch detection function 1 according to the first, second, third, fourth, and modification examples is applicable to various fields such as a television device, a digital camera, a notebook personal computer, a mobile terminal device such as a mobile phone, or a video camera. It can be applied to electronic devices. In other words, the display device with a touch detection function 1 according to the first, second, third, fourth, and modification examples is capable of displaying a video signal input from the outside or a video signal generated inside as an image or a video. It can be applied to other electronic devices.

(Application example 1)
The electronic device illustrated in FIG. 24 is a television device to which the display device with a touch detection function 1 according to the first, second, third, fourth, and modification examples is applied. The television apparatus includes, for example, a video display screen unit 510 including a front panel 511 and a filter glass 512. The video display screen unit 510 is related to the first, second, third, fourth, and modification examples. This is a display device with a touch detection function.

(Application example 2)
The electronic device illustrated in FIGS. 25 and 26 is a digital camera to which the display device 1 with a touch detection function according to the first, second, third, fourth, and modification examples is applied. The digital camera includes, for example, a flash light emitting unit 521, a display unit 522, a menu switch 523, and a shutter button 524. The display unit 522 is the same as in the first, second, third, fourth, and modification examples. This is a display device with a touch detection function.

(Application example 3)
27 represents an appearance of a video camera to which the display device with a touch detection function 1 according to the first, second, third, fourth, and modification examples is applied. This video camera has, for example, a main body 531, a subject photographing lens 532 provided on the front side surface of the main body 531, a start / stop switch 533 during photographing, and a display 534. The display unit 534 is a display device with a touch detection function according to the first, second, third, fourth, and modification examples.

(Application example 4)
The electronic device shown in FIG. 28 is a notebook personal computer to which the display device with a touch detection function 1 according to the first, second, third, fourth, and modification examples is applied. The notebook personal computer includes, for example, a main body 541, a keyboard 542 for inputting characters and the like, and a display unit 543 for displaying an image. The display unit 543 is provided in the first, second, third, fourth embodiments. And a display device with a touch detection function according to a modification.

(Application example 5)
The electronic device illustrated in FIGS. 29 to 35 is a mobile phone to which the display device with a touch detection function 1 according to the first, second, third, fourth, and modification examples is applied. This mobile phone is, for example, one in which an upper housing 551 and a lower housing 552 are connected by a connecting portion (hinge portion) 553, and includes a display 554, a sub display 555, a picture light 556, and a camera 557. Yes. The display 554 or the sub display 555 is a display device with a touch detection function according to the first, second, third, fourth, and modification examples.

<3. Aspect of the Present Disclosure>
The present disclosure also includes the following aspects.
(1)
A substrate,
A plurality of pixel electrodes arranged in a matrix on a plane parallel to the substrate;
A plurality of signal lines extending in a plane parallel to the surface of the substrate and supplying pixel signals for displaying images on the plurality of pixel electrodes;
A display functional layer that exhibits an image display function based on the pixel signal;
A plurality of drive electrodes facing the plurality of pixel electrodes in a direction perpendicular to the surface of the substrate and extending in a direction parallel to a direction in which the plurality of signal lines extend;
A plurality of touch detection electrodes facing the plurality of drive electrodes in the vertical direction and extending in a direction different from a direction in which the plurality of signal lines extend and capacitively coupled to the plurality of drive electrodes; ,
A scanning drive unit that scans the plurality of drive electrodes and applies a touch drive signal for touch detection to the plurality of drive electrodes, and
The display device with a touch detection function, wherein the scan driving unit applies the touch drive signal to a signal line facing the drive electrode to which the touch drive signal is applied so as to overlap in the vertical direction.
(2)
The scan driver is
In the display operation period, a display drive signal for display is applied to the plurality of drive electrodes, and pixel signals for displaying images on the plurality of pixel electrodes are supplied to the plurality of signal lines,
The display device with a touch detection function according to (1), wherein the touch drive signal is applied to the plurality of drive electrodes and the touch drive signal is applied to the signal line in a touch detection operation period.
(3)
A color filter facing the display function layer in the vertical direction and colored in a red region, a green region and a blue region which are different for each pixel electrode;
The extending direction of each red region, green region and blue region of the color filter coincides with the direction in which the plurality of signal lines extend,
The touch detection function according to (1) or (2), wherein the plurality of drive electrodes extend in parallel for each pixel including the red region, the green region, and the blue region of the color filter as a set. Display device.
(4)
The touch detection according to (3), wherein the plurality of drive electrodes are arranged so that adjacent drive electrodes overlap between a red region and a blue region of the color filter when viewed in the vertical direction. Display device with function.
(5)
The red region and the blue region of the color filter are arranged so as to sandwich the green region, and the respective widths in the direction orthogonal to the extending direction of the red region and the blue region are the green region of the color filter The display device with a touch detection function according to (4), which is narrower than a width in a direction orthogonal to the extending direction of.
(6)
The plurality of signal lines extend in a direction parallel to the direction in which the plurality of signal lines extend, and are arranged for each of the gaps of the adjacent drive electrodes, and each corresponds to the gap in the vertical direction. A plurality of metal auxiliary wirings arranged between the gap and the corresponding signal line among the plurality of signal lines,
The scanning drive unit applies the touch drive signal to a metal auxiliary wiring that is vertically opposed to a signal line to which the touch drive signal is applied among the plurality of metal auxiliary wirings, (2) to (5) The display device with a touch detection function according to any one of the above.
(7)
The plurality of signal lines extend in a direction parallel to a direction in which the plurality of signal lines extend, and are stacked on each of the plurality of drive electrodes of a transparent conductive material, and each of the plurality of signal lines as viewed in the vertical direction The display device with a touch detection function according to any one of (2) to (5), comprising a plurality of metal auxiliary wirings arranged at positions facing corresponding signal lines.
(8)
The touch according to any one of (1) to (7), wherein the plurality of touch detection electrodes detect the external proximity object using a change in capacitance based on proximity or contact of the external proximity object. Display device with detection function.
(9)
An electronic device including a display device with a touch detection function capable of detecting an external proximity object,
The display device with a touch detection function is:
A substrate,
A plurality of pixel electrodes arranged in a matrix on a plane parallel to the substrate;
A plurality of signal lines extending in a plane parallel to the surface of the substrate and supplying pixel signals for displaying images on the plurality of pixel electrodes;
A display functional layer that exhibits an image display function based on the pixel signal;
A plurality of drive electrodes facing the plurality of pixel electrodes in a direction perpendicular to the surface of the substrate and extending in a direction parallel to a direction in which the plurality of signal lines extend;
A plurality of touch detection electrodes facing the plurality of drive electrodes in the vertical direction and extending in a direction different from a direction in which the plurality of signal lines extend and capacitively coupled to the plurality of drive electrodes; ,
A scanning drive unit that scans the plurality of drive electrodes and applies a touch drive signal for touch detection to the plurality of drive electrodes, and
The scan driving unit applies the touch drive signal to a signal line facing the drive electrode to which the touch drive signal is applied so as to overlap in the vertical direction.
Electronics.

DESCRIPTION OF SYMBOLS 1 Display device with a touch detection function 2 Pixel substrate 3 Counter substrate 6 Liquid crystal layer 10 Display unit with a touch detection function 11 Control unit 12 Gate driver 13 Source driver 14 Drive electrode driver 20 Liquid crystal display unit 21 TFT substrate 22 Pixel electrode 30 Touch detection device 31 glass substrate 32 color filter 35 polarizing plate 40 touch detection unit 42 touch detection signal amplification unit 43 A / D conversion unit 44 signal processing unit 45 coordinate extraction unit 46 detection timing control unit COML drive electrode GCL scanning signal line LC liquid crystal element Pd display Period Pt Touch Detection Operation Period Pix Pixel R Resistance SGL Pixel Signal Line TDL Touch Detection Electrode Tr TFT Element Vcom Drive Signal Vdet Touch Detection Signal Vdisp Video Signal Vpix Pixel Signal Vscan Scan Signal

Claims (17)

A substrate,
A plurality of pixel electrodes disposed on the substrate;
A plurality of signal lines electrically connected to the plurality of pixel electrodes;
A plurality of drive electrodes arranged to face the plurality of signal lines;
A scanning drive unit that applies a touch drive signal for touch detection to at least one selected first drive electrode among the plurality of drive electrodes;
The scanning drive unit applies the same rectangular wave as the touch drive signal to at least one first signal line facing the selected first drive electrode. The display device according to claim 1, wherein the scanning drive unit applies a display drive signal for display to at least one selected second drive electrode among the plurality of drive electrodes. The display device according to claim 2, wherein the scan driving unit applies a pixel signal to at least one second signal line facing the selected second driving electrode among the plurality of signal lines. The display device according to claim 2, wherein the scan driving unit has a display operation period for supplying the display drive signal and a touch operation period for supplying the touch drive signal. The display device according to claim 1, wherein the scan driving unit fixes at least one third driving electrode other than the first driving electrode to a first reference potential. The display device according to claim 5, wherein the scan driving unit fixes at least one third signal line facing the third driving electrode to a first reference potential. The display according to claim 1, wherein the scan driver applies the same signal to at least one third drive electrode other than the first drive electrode and a third signal line facing the third drive electrode. apparatus. A plurality of first wirings connecting the scan driver and the plurality of drive electrodes;
A plurality of first switch elements electrically connected to the plurality of first wirings;
The display device according to claim 1, wherein at least one first switch element among the plurality of first switch elements is electrically connected to at least one signal line among the plurality of signal lines. The scanning drive unit turns on at least one selected first switch element among the plurality of first switch elements to drive the drive electrode electrically connected to the selected first switch element. The display device according to claim 8, wherein a touch drive signal is supplied to both the signal line electrically connected to the selected first switch element. A second wiring for supplying the touch drive signal;
A plurality of first switch elements electrically connected to the second wiring;
The plurality of signal lines extend in a first direction and are arranged in a second direction intersecting the first direction,
The plurality of signal lines have a plurality of first ends and a plurality of second ends as ends in the first direction,
The second wiring extends along a plurality of end portions of at least one of the plurality of first end portions or the plurality of second end portions,
The display device according to claim 1, wherein the plurality of first switch elements are electrically connected to the plurality of one end portions. A second switch element electrically connected to the second wiring;
The second wiring extends along a plurality of other end portions of the plurality of first end portions or the plurality of second end portions,
The display device according to claim 10, wherein the plurality of second switch elements are electrically connected to the other plurality of ends. A first control signal line for supplying a plurality of control signals for the first switch elements;
A second control signal line for supplying a plurality of control signals for the second switch elements,
The display device according to claim 11, wherein the first control signal line and the second control signal line are electrically connected. The plurality of signal lines extend in the first direction and are arranged in the second direction,
The display device according to claim 1, wherein the plurality of drive electrodes extend in a first direction and are arranged in a second direction. A plurality of detection electrodes facing the plurality of drive electrodes;
The display device according to claim 1, further comprising: a touch detection unit that detects a change in capacitance between the plurality of drive electrodes and the plurality of detection electrodes. A color filter layer facing the plurality of drive electrodes;
The color filter layer has a red region, a green region, a blue region,
The slit between the at least one drive electrode and the drive electrode adjacent to the at least one drive electrode among the plurality of drive electrodes is opposed to the slit between the red region and the blue region. Display device. Having multiple metal auxiliary wires,
The plurality of metal auxiliary wirings are opposed to the plurality of signal lines,
The scanning drive unit applies the same rectangular wave as the touch drive signal to at least one metal auxiliary wiring among the plurality of metal auxiliary wirings facing the first signal line. Display device. Having multiple metal auxiliary wires,
The plurality of drive electrodes are formed of a transparent conductive material,
The display device according to claim 1, wherein the plurality of metal auxiliary wirings are stacked on the plurality of drive electrodes.

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