JP6637578B2 - Display device with sensor - Google Patents

Description

  An embodiment of the present invention relates to a display device with a sensor.

  2. Description of the Related Art In recent years, a sensor-equipped display device including a sensor (or sometimes referred to as a touch panel) for detecting contact or approach of an object has been put to practical use. As an example of a sensor, there is a capacitance type sensor that detects contact or approach of a conductor such as a finger based on a change in capacitance. The detection electrode and the sensor drive electrode constituting such a sensor are arranged in a display area for displaying an image, and face each other via a dielectric.

JP 2012-195010 A

  The present embodiment provides a display device with a sensor that can detect an input position and an input pressure.

The display device with the sensor according to one embodiment,
A display panel having a common electrode and a plurality of source lines , a detection electrode, a conductive unit disposed at an interval between the display panel and the detection electrode, and a control unit, wherein the control unit displays an image. a display period for displaying with a common drive signal to drive the common electrode, a first sensing period which deviates from the display period, the input from the detecting electrode to drive the common electrodes using a first sensor drive signal removed position information, the second sensing period deviating from the display period and the first sensing period, using the second sensor drive signal drives the common electrodes second distance between the common electrode and the conductive portion the second input pressure information based on the changed Eject from the conductive portion, wherein, in the first and second sensing period, switching all the source lines electrically floating state .

FIG. 1 is an exploded perspective view illustrating a configuration of a liquid crystal display device according to an embodiment. FIG. 2 is an exploded perspective view showing the backlight unit shown in FIG. FIG. 3 is a sectional view showing a configuration of the liquid crystal display device shown in FIG. FIG. 4 is a cross-sectional view illustrating a configuration of the liquid crystal display device illustrated in FIG. 1 and illustrates a liquid crystal display panel, a cover member, and the like. FIG. 5 is a diagram showing a basic configuration and an equivalent circuit of the liquid crystal display device shown in FIG. FIG. 6 is an equivalent circuit diagram showing the pixel shown in FIG. FIG. 7 is a plan view showing a first substrate of the liquid crystal display device, showing a first insulating substrate, a plurality of divided electrodes of a common electrode, a plurality of lead wires, and a common electrode driving circuit. FIG. 8 is a plan view illustrating a part of the liquid crystal display device, and is a diagram illustrating a first insulating substrate, a second insulating substrate, a peripheral light-shielding layer, and a detection unit. FIG. 9 is a table showing the operation, mode, and method of the liquid crystal display device for each period. FIG. 10A is a diagram for explaining the principle of an example of the first sensing in the first mode. FIG. 10B is a diagram subsequent to FIG. 10A for explaining the principle of an example of the first sensing in the first mode. FIG. 11 is a diagram for explaining the principle of an example of the first sensing in the second mode. FIG. 12 is an enlarged plan view showing a part of a third region outside the display region of the first substrate of the liquid crystal display panel, and is a circuit diagram showing a multiplexer. FIG. 13 is a table showing, in a case where the second sensing in the second mode is performed by the first method, a drive target and a pressure information extraction target in a table. FIG. 14 is a table showing, in a case where the second sensing in the second mode is performed by the second method, a driving target and a pressure information extraction target in a table. FIG. 15 is a table showing, in the case of performing the second sensing in the first mode, a drive target, a pressure information extraction target, and a ground potential target in a table. FIG. 16 is a cross-sectional view illustrating a configuration of a liquid crystal display device with a sensor according to Example 1 of the embodiment. FIG. 17 is a plan view showing the conductive layer and the light reflector shown in FIG. FIG. 18 is a timing chart for explaining the driving method of the liquid crystal display device according to the first embodiment. The control signal, the video signal, the common drive signal, and the control signal in the first period of the F-th one frame period are displayed. FIG. 3 is a diagram illustrating a write signal and a read signal. FIG. 19 is a timing chart for explaining the driving method of the liquid crystal display device according to the first embodiment. The control signal, the video signal, the common drive signal, and the control signal in the second period of the F-th one frame period are shown. FIG. 3 is a diagram illustrating a second write signal and a second read signal. FIG. 20 is a cross-sectional view illustrating a configuration of a liquid crystal display device with a sensor according to Example 2 of the above embodiment. FIG. 21 is a timing chart for explaining the driving method of the liquid crystal display device according to the second embodiment. The control signal, the video signal, the common drive signal, and the control signal in the first period of the F-th one frame period are shown. FIG. 3 is a diagram illustrating a write signal and a read signal. FIG. 22 is a timing chart for explaining the driving method of the liquid crystal display device according to the second embodiment. The control signal, the video signal, the common drive signal, and the control signal in the second period of the F-th one frame period are shown. FIG. 9 is a diagram illustrating a third write signal and a third read signal. FIG. 23 is a cross-sectional view illustrating a configuration of a liquid crystal display device with a sensor according to Example 3 of the above embodiment. FIG. 24 is a plan view showing the sensor electrode and the housing shown in FIG. FIG. 25 is a timing chart for explaining the driving method of the liquid crystal display device according to the third embodiment. The control signal, the video signal, the common drive signal, and the control signal in the first period of the F-th one frame period are shown. FIG. 3 is a diagram illustrating a write signal and a read signal. FIG. 26 is a timing chart for explaining a driving method of the liquid crystal display device according to the third embodiment. The control signal, the video signal, the common driving signal, and the control signal in the second period of the F-th one frame period are shown. FIG. 9 is a diagram illustrating a third write signal and a third read signal. FIG. 27 is a diagram illustrating an example of use of an application by the liquid crystal display device according to the embodiment. FIG. 28 is a diagram for describing an example of use of another application by the liquid crystal display device according to the above embodiment. FIG. 29 is a plan view showing Modification Example 1 of the sensor electrode according to the embodiment. FIG. 30 is a plan view showing Modified Example 2 of the sensor electrode according to the above embodiment. FIG. 31 is a plan view showing Modified Example 3 of the sensor electrode according to the embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the disclosure is merely an example, and those skilled in the art can easily conceive of appropriate changes while maintaining the gist of the invention, which are naturally included in the scope of the present invention. In addition, in order to make the description clearer, the width, thickness, shape, and the like of each part may be schematically illustrated as compared with actual embodiments, but this is merely an example, and the interpretation of the present invention is not limited thereto. There is no limitation. In the specification and the drawings, components similar to those described in regard to a drawing thereinabove are marked with like reference numerals, and a detailed description is omitted as appropriate.

  A display device with a sensor according to one embodiment will be described in detail. In the present embodiment, a case where the display device is a liquid crystal display device will be described. FIG. 1 is an exploded perspective view showing the configuration of the liquid crystal display device according to the first embodiment.

  As shown in FIG. 1, the liquid crystal display device DSP includes a liquid crystal display panel PNL, a backlight unit BL for illuminating the liquid crystal display panel PNL, and a control module CM for electrically controlling the liquid crystal display panel PNL and the backlight unit BL. , A housing CA, and a cover member CG. The liquid crystal display panel PNL has a plane parallel to an XY plane defined by a first direction X and a second direction Y orthogonal to each other. In the present embodiment, the first direction X and the second direction Y are orthogonal to each other, but may intersect at an angle other than 90 °. The third direction Z is orthogonal to each of the first direction X and the second direction Y. The third direction Z corresponds to the thickness direction of the liquid crystal display panel PNL.

  In the third direction Z, the liquid crystal display panel PNL and the backlight unit BL are located between the bottom surface of the housing CA and the cover member CG, and the backlight unit BL is located between the housing CA and the liquid crystal display panel PNL. It is located in. The backlight unit BL may be arranged at an interval on the liquid crystal display panel PNL. Further, the backlight unit BL can be arranged at intervals in the housing CA. The casing CA has a box shape having an opening at the top, and houses the liquid crystal display panel PNL, the backlight unit BL, and the control module CM. The housing CA may be formed of a conductive material such as a metal, or may be formed of a resin and have a surface layer formed of a metal material. The cover member CG closes the opening of the casing CA, and covers the liquid crystal display panel PNL and the like together with the casing CA.

FIG. 2 is an exploded perspective view showing the backlight unit BL shown in FIG. As shown in FIG. 2, the backlight unit BL includes a light guide LG, a light source LS, a light reflector RS, a light diffusion sheet DI, a brightness enhancement film BEF, and a frame FR. The backlight unit BL has a shape and a size corresponding to the liquid crystal display panel PNL.
The light guide LG is located between the liquid crystal display panel PNL and the housing CA. In the present embodiment, the light guide LG is formed in a flat rectangular shape. The light source LS emits light to the light guide LG. In the present embodiment, the light source LS utilizes a light emitting diode (LED) and is arranged to face one side of the light guide LG.

  The light reflector RS is located between the light guide LG and the housing CA. The light reflector RS reflects light emitted from the light guide LG in a direction opposite to the liquid crystal display panel PNL, and emits the light toward the liquid crystal display panel PNL. By reducing the light loss, the luminance level of the displayed image can be improved. In the present embodiment, the light reflector RS is formed in a rectangular sheet shape. In the XY plane, the area of the light reflector RS is substantially the same as the area of the light guide LG. For example, the light reflector RS may have a multilayer film structure using a polyester resin.

  The light diffusion sheet DI is located between the light guide LG and the liquid crystal display panel PNL. The light diffusion sheet DI can diffuse the light incident from the light guide LG and emit the light to the liquid crystal display panel PNL. That is, since the light transmitted through the light diffusion sheet DI is diffused, the light diffusion sheet DI can suppress luminance unevenness of the light emitted from the backlight unit BL on the XY plane. In the present embodiment, the light diffusion sheet DI is formed in a rectangular sheet shape. In the XY plane, the area of the light diffusion sheet DI is substantially the same as the area of the light guide LG.

  The brightness enhancement film BEF is located between the light diffusion sheet DI and the liquid crystal display panel PNL. The brightness enhancement film BEF has a function of improving the brightness level of light emitted from the backlight unit BL. In the present embodiment, the brightness enhancement film BEF is formed in a rectangular film shape. In the XY plane, the area of the brightness enhancement film BEF is substantially the same as the area of the light guide LG.

The frame FR is used for modularizing the backlight unit BL. A light guide LG, a light source LS, and the like are attached to the frame FR, and the relative positions of the light guide LG and the light source LS are fixed. In the present embodiment, the frame FR is formed in a rectangular frame shape. In the XY plane, the frame FR entirely surrounds the aggregate of the light guide LG and the light source LS. Here, a path FRP through which the flexible wiring board connected to the light source LS passes is formed in the frame FR. The frame FR may be formed of a conductive material such as a metal.
The shape of the frame FR in the XY plane can be variously modified, and any shape may be used as long as it does not hinder the illumination of the liquid crystal display panel PNL. For example, in the XY plane, the frame FR has an L-shape facing two adjacent sides of the light guide LG, a Π-shape facing three adjacent sides of the light guide LG, and a facing of the light guide LG. It may have a shape such as a II-shape facing two sides to be formed.

  Here, FIG. 2 exemplarily shows the backlight unit BL, but various forms are applicable as the backlight unit BL. For example, the backlight unit BL may be formed except for at least a part of the light reflector RS, the light diffusion sheet DI, and the brightness enhancement film BEF. Alternatively, the backlight unit BL may be formed by adding an optical member not shown in FIG. The backlight unit BL only needs to be configured to emit light to the liquid crystal display panel PNL. If the liquid crystal display panel PNL is a reflection type having only a reflection display function, the backlight unit BL is omitted.

FIG. 3 is a cross-sectional view showing a configuration of the liquid crystal display device DSP shown in FIG.
As shown in FIG. 3, the liquid crystal display device DSP includes a liquid crystal display panel PNL, a driving IC chip IC1 for driving the liquid crystal display panel PNL, a cover member CG, a first optical element OD1, and a second optical element OD2. , A detection unit D, a drive IC chip IC2 for driving the liquid crystal display panel PNL and the detection unit D, a backlight unit BL, and flexible wiring boards FPC1, FPC2, and FPC3.

  The driving IC chip IC1 is mounted on the first substrate SUB1 of the liquid crystal display panel PNL. The flexible wiring board FPC1 is connected to the liquid crystal display panel PNL. The connectors CO1 and CO2 are mounted on the flexible wiring board FPC1. The flexible wiring board FPC1 is connected to the control module CM via the connector CO1.

  The flexible wiring board FPC2 connects the detection unit D to the connector CO2. The flexible wiring board FPC3 connects the light source LS (backlight unit BL) to the flexible wiring board FPC1. The driving IC chip IC1 and the driving IC chip IC2 are connected via flexible wiring boards FPC1, FPC2 and the like. To exemplify the arrangement of the driving IC chip IC2, the driving IC chip IC2 is mounted on any one of the flexible wiring boards FPC1, FPC2, and FPC3, or each of the flexible wiring boards FPC1 and FPC2. And can be mounted separately.

  The means for connecting the control module CM, the liquid crystal display panel PNL, and the detection unit D to each other, and the means for connecting the light source LS to the control module CM can be variously modified. For example, one flexible wiring board may be used instead of the three independent flexible wiring boards FPC1, FPC2, and FPC3 and the connectors CO1 and CO2. In this case, the flexible wiring board is connected to the control module CM, the first branch of the flexible wiring board is connected to the liquid crystal display panel PNL, the second branch of the flexible wiring board is connected to the detection unit D, The third branch portion of the flexible wiring board can be connected to the light source LS.

The control module CM, the drive IC chip IC1, and the drive IC chip IC2 function as a control unit of the first sensor SE1 including the common electrode CE and the detection unit D of the liquid crystal display panel PNL. The control unit has a function as a driving unit that drives the common electrode CE and a function as a detection unit that extracts a signal from the detection unit D. The control module CM can be referred to as an application processor. The drive IC chip IC2 can provide the drive IC chip IC1 with a timing signal notifying the drive timing of the first sensor SE1. Alternatively, the driving IC chip IC1 can provide a timing signal for notifying the driving timing of the common electrode CE to the driving IC chip IC2. Alternatively, the control module CM can supply a timing signal to each of the driving IC chips IC1 and IC2. The drive of the drive IC chip IC1 and the drive of the drive IC chip IC2 can be synchronized by the timing signal.
Note that the control module CM is connected to the light source LS and controls driving of the light source LS.

FIG. 4 is a cross-sectional view illustrating a configuration of the liquid crystal display device DSP illustrated in FIG. 1 and illustrates a liquid crystal display panel PNL, a cover member CG, and the like.
As shown in FIG. 4, the liquid crystal display device DSP includes a liquid crystal display panel PNL, a cover member CG, a first optical element OD1, a second optical element OD2, a backlight unit BL, and the like.

  The liquid crystal display panel PNL includes a first flat substrate SUB1, a second flat substrate SUB2 opposed to the first substrate SUB1, and a liquid crystal held between the first and second substrates SUB1 and SUB2. And a layer LC. The liquid crystal display panel PNL includes a display area (active area) DA for displaying an image. Outside the display area DA, the first substrate SUB1 and the second substrate SUB2 are joined by a sealing material SEA. For example, the first substrate SUB1 is formed using a light-transmitting first insulating substrate 10 such as a glass substrate or a resin substrate. The first substrate SUB1 has a common electrode CE, a plurality of pixel electrodes PE, and an insulating film IF interposed between the common electrode CE and the plurality of pixel electrodes PE on a side of the first insulating substrate 10 facing the second substrate SUB2. And so on. The common electrode CE and the pixel electrode PE are formed of a transparent conductive material such as indium tin oxide (Indium Tin Oxide: ITO), indium zinc oxide, (Indium Zinc Oxide: IZO), and zinc oxide (Zinc Oxide: ZnO). Have been. The second substrate SUB2 is formed using a light-transmitting second insulating substrate 20, such as a glass substrate or a resin substrate.

  The illustrated liquid crystal display panel PNL has a configuration corresponding to an FFS (Fringe Field Switching) mode as a display mode, but may have a configuration corresponding to another display mode. For example, the liquid crystal display panel PNL may have a configuration corresponding to an IPS (In-Plane Switching) mode using a horizontal electric field substantially parallel to the main surface of the substrate, such as an FFS mode. In the display mode using the horizontal electric field, for example, a configuration in which both the pixel electrode PE and the common electrode CE are provided on the first substrate SUB1 is applicable. Alternatively, the liquid crystal display panel PNL has a configuration corresponding to a mode mainly using a vertical electric field generated between the main surfaces of the substrate, such as a TN (Twisted Nematic) mode, an OCB (Optically Compensated Bend) mode, and a VA (Vertical Aligned) mode. It may be. In the display mode using the vertical electric field, for example, a configuration in which the pixel electrode PE is provided on the first substrate SUB1 and the common electrode CE is provided on the second substrate SUB2 is applicable. Note that the substrate main surface here is a surface parallel to the XY plane.

  In the present embodiment, the first substrate SUB1 can be paraphrased as an array substrate, and the second substrate SUB2 can be paraphrased as a counter substrate. The liquid crystal display panel PNL is a transmissive liquid crystal display panel having a transmissive display function of displaying an image by selectively transmitting light from the backlight unit BL. The liquid crystal display panel PNL may be a transflective liquid crystal display panel having a reflective display function of displaying an image by selectively reflecting external light in addition to the transmissive display function.

The cover member CG is located outside the liquid crystal display panel PNL and faces the second substrate SUB2. In this example, the input surface IS of the liquid crystal display device DSP is the surface of the cover member CG. The liquid crystal display device DSP can detect the position information (input position information) of the first input means when the first input means contacts or approaches the input surface IS. The liquid crystal display device DSP can detect pressure information (input pressure information) when the input surface IS is pressed by the second input means. The pressure information is information relating to the force by which the second input means presses the input surface IS, and the information obtained varies depending on the magnitude of the pressure. As the first input unit, a conductor or a conductive object such as a finger can be used. The second input means may be any object that can apply a load to the input surface IS, and may use a dielectric or an insulator in addition to the conductor, the finger, and the like.
For example, a finger can serve as both the first input means and the second input means. Then, the liquid crystal display device DSP can detect both the position information and the pressure information of the location pressed by the finger.

  In the XY plan view, for example, the size of the cover member CG is larger than the size of the second substrate SUB2 or the size of the first substrate SUB1. The cover member CG is formed of, for example, a glass substrate. In this case, the cover member CG may be called a cover glass. Alternatively, the cover member CG can be formed using a light-transmitting substrate such as a resin substrate.

The first optical element OD1 is arranged between the first insulating substrate 10 and the backlight unit BL. The first optical element OD1 is attached to the first insulating substrate 10 with an adhesive AD1. The second optical element OD2 is located between the liquid crystal display panel PNL and the cover member CG. The second optical element OD2 is attached to the second insulating substrate 20 and the detection unit D with an adhesive AD2. The first optical element OD1 and the second optical element OD2 each include at least a polarizing plate, and may include a retardation plate as needed. The absorption axis of the polarizing plate included in the first optical element OD1 intersects with the absorption axis of the polarizing plate included in the second optical element OD2. For example, the absorption axes of the polarizing plates are orthogonal to each other.
In order to prevent charging in the second optical element OD2, an antistatic layer AS is provided between the second optical element OD2 and the adhesive AD2. However, the antistatic layer AS may be located between the second optical element OD2 and the cover member CG, and the antistatic layer AS may be provided on the liquid crystal display device DSP as needed.

  The cover member CG is joined to the second optical element OD2 by the adhesive layer AL. For example, the adhesive layer AL is formed of an optically transparent resin (OCR). As described above, since the liquid crystal display device DSP detects pressure information, the adhesive layer AL may be elastically deformed, but it is sufficient that the force applied from the cover member CG can be transmitted to the second optical element OD2.

  The detection unit D is located between the common electrode CE and the cover member CG. In this embodiment, the detection unit D is provided above a surface of the second insulating substrate 20 facing the second optical element OD2. For this reason, the detection unit D may be in contact with the second insulating substrate 20 or may be located away from the second insulating substrate 20. In the latter case, a member such as an insulating film (not shown) is interposed between the second insulating substrate 20 and the detection unit D. The detection unit D has a plurality of detection electrodes DE extending in the second direction Y. Note that the detection unit D also has a function of releasing charges accumulated in the antistatic layer AS to the outside.

  The plurality of common electrodes CE and the detection unit D form a capacitance-type first sensor SE1. The common electrode CE functions as a display electrode and also functions as a sensor drive electrode. The first sensor SE1 is used for detecting position information.

FIG. 5 is a diagram showing a basic configuration and an equivalent circuit of the liquid crystal display device DSP shown in FIG.
As shown in FIG. 5, the liquid crystal display panel PNL is an active matrix type liquid crystal display panel. The liquid crystal display panel PNL includes a gate line drive circuit GD located in a non-display area NDA outside the display area DA. The driving IC chip IC1 that drives the liquid crystal display panel PNL is located in the non-display area NDA of the liquid crystal display panel PNL. In the present embodiment, the drive IC chip IC1 includes a source line drive circuit SD and a common electrode drive circuit CD. Note that the driving IC chip IC1 may include at least a part of the source line driving circuit SD and the common electrode driving circuit CD. The shape of the non-display area NDA is a frame shape surrounding the display area DA, and is a rectangular frame shape. The display area may have a non-rectangular configuration in plan view, such as a circular shape, an elliptical shape, or a shape obtained by curving a part of a rectangular shape.

  The liquid crystal display panel PNL includes a plurality of pixels PX in the display area DA. The plurality of pixels PX are provided in a matrix in the first direction X and the second direction Y, and are arranged by m × n (where m and n are positive integers). Further, the liquid crystal display panel PNL includes, in the display area DA, n gate lines G (G1 to Gn), m source lines S (S1 to Sm), a common electrode CE, and the like. In the present embodiment, the three pixels PX arranged in the first direction X are a red pixel, a green pixel, and a blue pixel, and constitute one main pixel.

  The gate line G extends substantially linearly in the first direction X, extends outside the display area DA, and is connected to the gate line drive circuit GD. The gate lines G are arranged at intervals in the second direction Y. The source line S extends substantially linearly in the second direction Y, extends outside the display area DA, and is connected to the source line drive circuit SD. The source lines S are arranged at intervals in the first direction X and intersect with the gate lines G. Note that the gate lines G and the source lines S do not necessarily have to extend linearly, and some of them may be bent. The common electrode CE is provided at least in the display area DA, and is electrically connected to the common electrode drive circuit CD. The common electrode CE has a plurality of divided electrodes C. The split electrode C is shared by a plurality of pixels PX.

FIG. 6 is an equivalent circuit diagram showing the pixel PX shown in FIG.
As shown in FIG. 6, each pixel PX includes a pixel switching element PSW, a pixel electrode PE, a common electrode CE (divided electrode C), a liquid crystal layer LC, and the like. The pixel switching element PSW is formed of, for example, a thin film transistor. The pixel switching element PSW is electrically connected to the gate line G and the source line S. The pixel switching element PSW may be either a top gate type or a bottom gate type. Further, the semiconductor layer of the pixel switching element PSW is formed of, for example, polysilicon, but may be formed of amorphous silicon, an oxide semiconductor, or the like. The pixel electrode PE is formed of a transparent conductive film such as ITO and is electrically connected to the pixel switching element PSW. The pixel electrode PE faces the common electrode CE. The common electrode CE, the insulating film (the above-described insulating film IF), and the pixel electrode PE form a storage capacitor CS.

FIG. 7 is a plan view showing a first substrate SUB1 of the liquid crystal display device DSP, showing a first insulating substrate 10, a plurality of divided electrodes C of a common electrode CE, a plurality of lead lines LCE, and a common electrode drive circuit CD. It is.
As shown in FIG. 7, the plurality of divided electrodes C are each formed in a strip shape, extend in the first direction X, and are arranged at intervals in the second direction Y. In the present embodiment, the common electrode CE is formed in the display area DA. However, the present invention is not limited to this, and a part of the common electrode CE may be formed to extend to the non-display area NDA. .

  The plurality of lead lines LCE are located in the non-display area NDA, and electrically connect the common electrode CE to the common electrode drive circuit CD. Here, the lead wire LCE is electrically connected to the split electrode C one-to-one. The lead wire LCE may be formed of a transparent conductive material such as ITO, IZO, or ZnO similarly to the split electrode C, but may be formed of metal instead of the transparent conductive material.

  The number, size, and shape of the divided electrodes C are not particularly limited and can be variously changed. The common electrode CE may be a single plate electrode formed continuously in the display area DA without being divided. In the present embodiment, an example is shown in which the split electrode C extends in the first direction X, but the present invention is not limited to this, and the split electrode C may extend in the second direction Y. In this case, the detection electrode DE May extend in the first direction X.

  Here, of the non-display area NDA, the left side of the display area DA is the first area A1 (a band-shaped area extending in the second direction Y), and the right side of the display area DA is the second area A2 (the second direction Y). A third area A3 (a belt-shaped area extending in the first direction X) below the display area DA, and a fourth area A4 (a first area X) extending above the display area DA. Banded area). For example, the common electrode drive circuit CD is arranged in the third area A3, and the lead LCE extends in the first area A1 and the third area A3.

FIG. 8 is a plan view illustrating a part of the liquid crystal display device DSP, and is a diagram illustrating the first insulating substrate 10, the second insulating substrate 20, the peripheral light-shielding layer LS, and the detection unit D. FIG. 8 is a plan view of the detection unit D and the like viewed from the direction opposite to the third direction Z.
As shown in FIG. 8, a peripheral light-shielding layer LS is arranged in the non-display area NDA of the second substrate SUB2. The peripheral light-shielding layer LS extends over substantially the entire non-display area NDA of the second substrate SUB2. For example, the peripheral light-shielding layer LS is provided on the side of the second insulating substrate 20 facing the first substrate SUB1.

The detection unit D includes a plurality of detection electrodes DE, a plurality of dummy units DU, and a plurality of lead lines LDE. The plurality of detection electrodes DE are each formed in a band shape, extend in the second direction Y, and are arranged at intervals in the first direction X.
The lead line LDE is located in the non-display area NDA, and electrically connects the detection electrode DE to the flexible wiring board FPC2. Here, the lead wire LDE is electrically connected to the detection electrode DE on a one-to-one basis. Here, the lead line LDE extends in the third region A3.

The dummy unit DU is arranged between the adjacent detection electrodes DE. It is desirable that the dummy portion DU be formed at least in the entire display area DA deviating from the detection electrode DE. The dummy unit DU is not connected to wiring such as the lead line LDE and is in an electrically floating state. The dummy unit DU has a plurality of dummy electrodes DR provided with a gap therebetween. The dummy electrode DR is also arranged with a gap from the detection electrode DE.
The detection electrode DE and the dummy part DU are formed of a transparent conductive material such as ITO, IZO, ZnO. The lead wire LDE may be formed of a transparent conductive material such as ITO, IZO, or ZnO in the same manner as the detection electrode DE, but instead of a transparent conductive material, a thin metal wire having a thickness of several μm to several tens μm is used. It may be formed.
Since the gap is formed between the dummy electrodes DE as described above, a signal can be sent from the common electrode CE to the detection electrode DE through the gap. For example, the common electrode CE and the detection electrode DE can be capacitively coupled.

Next, an operation at the time of display driving for displaying an image in the above-mentioned FFS mode liquid crystal display device DSP will be described.
First, an off state in which no voltage is applied to the liquid crystal layer LC will be described. The off state corresponds to a state where no potential difference is formed between the pixel electrode PE and the common electrode CE. In such an off state, the liquid crystal molecules included in the liquid crystal layer LC are initially aligned in one direction in the XY plane due to the alignment control force of the alignment films of the first substrate SUB1 and the second substrate SUB2. . Part of the light from the backlight unit BL passes through the polarizing plate of the first optical element OD1, and enters the liquid crystal display panel PNL. Light incident on the liquid crystal display panel PNL is linearly polarized light orthogonal to the absorption axis of the polarizing plate. The polarization state of such linearly polarized light hardly changes when passing through the liquid crystal display panel PNL in the off state. Therefore, most of the linearly polarized light transmitted through the liquid crystal display panel PNL is absorbed by the polarizing plate of the second optical element OD2 (black display). Such a mode in which the liquid crystal display panel PNL performs black display in the off state is called a normally black mode.

  Subsequently, an ON state in which a voltage is applied to the liquid crystal layer LC will be described. The ON state corresponds to a state where a potential difference is formed between the pixel electrode PE and the common electrode CE. That is, a common drive signal (common voltage) is supplied to the common electrode CE from the common electrode drive circuit CD. On the other hand, a video signal (image signal) that forms a potential difference with respect to the common voltage is supplied to the pixel electrode PE. Accordingly, in the ON state, a fringe electric field is formed between the pixel electrode PE and the common electrode CE.

  In such an ON state, the liquid crystal molecules are aligned in a different direction from the initial alignment direction in the XY plane. In the ON state, linearly polarized light orthogonal to the absorption axis of the polarizing plate of the first optical element OD1 is incident on the liquid crystal display panel PNL, and its polarization state depends on the alignment state of liquid crystal molecules when passing through the liquid crystal layer LC. Change. Therefore, in the ON state, at least a part of the light that has passed through the liquid crystal layer LC passes through the polarizing plate of the second optical element OD2 (white display).

Next, the operation of the liquid crystal display device DSP will be described. FIG. 9 is a table showing the operation, mode, and mode of the liquid crystal display device DSP for each period.
As illustrated in FIG. 9, the operation of the liquid crystal display device DSP includes display driving in a display period and sensing driving in a sensing period (touch detection period). The sensing drive is divided into a first sensing drive and a second sensing drive.

At the time of the first sensing drive, first sensing for detecting contact or approach of a finger (first input means) to the input surface IS of the liquid crystal display device DSP is performed. The first sensing can detect input position information by a finger using the first sensor SE1. The first sensing may be referred to as position detection. The control unit formed by the driving IC chips IC1 and IC2 of the liquid crystal display device DSP and the control module CM controls the first sensor SE1 by switching to one of the first mode and the second mode, and performs the first sensing. The first mode may be referred to as a self-capacitive sensing mode, and the second mode may be referred to as a mutual-capacitive sensing mode.
On the other hand, at the time of the second sensing drive, the second sensing for detecting the pressure information (the magnitude and distribution of the pressure) in a state where the input surface IS of the liquid crystal display device DSP is pressed by the finger (the second input means) is performed. It is. The second sensing can detect input pressure information by a finger using a second sensor (SE2) described later. The second sensing may be referred to as pressure detection. The control unit formed by the driving IC chips IC1 and IC2 of the liquid crystal display device DSP and the control module CM controls the second sensor by switching to one of the first mode and the second mode, and performs the second sensing. In the second sensing, the first mode may be referred to as a self-capacitive sensing mode, and the second mode may be referred to as a mutual-capacitive sensing mode. The second sensing in the second mode can be further roughly divided into a first method and a second method.

Next, the first sensing will be described.
<Position detection in the first mode (self-capacity mode)>
First, the first sensing in the first mode will be described. The first mode has a feature that the position information of the finger can be roughly detected in a short time for the entire input area. Here, in the first sensing in the first mode, the drive target Tx1 and the target Rx1 from which the position information is extracted are as follows.
Tx1: detection electrode DE
Rx1: detection electrode DE
As shown in FIG. 10A, first, the drive IC chip IC2 writes a write signal Vw to each detection electrode DE and drives the detection electrode DE. Thereafter, as shown in FIG. 10B, the driving IC chip IC2 reads the read signal Vr from the detection electrode DE. Here, the read signal Vr indicates a change in the sensor signal generated on the detection electrode DE by the write signal Vw. The drive IC chip IC2 can extract the position information of the finger by reading the read signal Vr.

As shown in FIGS. 10A and 10B, in this example, the user's finger approaches the second detection electrode DE from the right, and capacitance coupling occurs between the detection electrode and the finger. The read signal Vr read from the second detection electrode DE from the right has a larger voltage value change than the read signal Vr read from the other detection electrodes DE.
Therefore, it is possible to determine that the area facing the second detection electrode DE from the right is the X coordinate of the input position. That is, it is possible to detect that the finger has contacted or approached the input surface IS of the liquid crystal display device DSP in the region facing the detection electrode DE.

<Position detection in the second mode (mutual capacitance mode)>
Next, the first sensing in the second mode will be described. The second mode has a feature that the X coordinate and the Y coordinate of the input position can be detected in detail for at least a part of the input area. Here, in the first sensing in the second mode, the drive target Tx1 and the target Rx1 from which the position information is extracted are as follows.
Tx1: Common electrode CE
Rx1: detection electrode DE
As shown in FIG. 11, a capacitance Cc exists between the common electrode CE and the detection electrode DE. That is, the detection electrode DE is capacitively coupled to the common electrode CE. In this example, it is assumed that the user's finger exists close to the position where the second divided electrode C from the top and the second detection electrode DE from the right intersect. When a user's finger approaches the detection electrode DE, a coupling capacitance Cx is generated.

  First, the drive IC chip IC1 writes a pulse-like write signal (sensor drive signal) Vw to the divided electrode C, and generates a sensor signal between the divided electrode C and the detection electrode DE. Next, the drive IC chip IC2 reads a read signal Vr indicating a change in a sensor signal (for example, a capacitance generated in the detection electrode DE) from the detection electrode DE. The drive IC chip IC2 can extract the position information of the finger by reading the read signal Vr. Finger position information can be detected based on the timing at which the write signal Vw is supplied to the divided electrode C and the read signal Vr from the detection electrode DE.

Here, the first sensing in the second mode can be performed after the approximate position information of the finger is detected in the first sensing in the first mode. In the above example, in the first sensing in the first mode, it is specified that an input has been made in the area facing the second detection electrode DE from the right, so that only the above area or only the vicinity of the above area is targeted. The X coordinate and the Y coordinate of the input position may be detected in detail by the first sensing in the second mode.
In the above description, in the position detection, the second mode is performed after passing through the first mode, but it is also possible to perform only the second mode. In addition, by arranging the common electrodes in a matrix shape instead of a band shape, it is possible to adopt a configuration in which position detection is performed only in the second mode.

  The details of the second sensing for detecting the pressure information (hereinafter, may be referred to as pressure detection) will be described later. However, the liquid crystal display device DSP performs the second sensing using the second sensor SE2 to input the input surface IS. Can be detected when the finger is pressed by a finger (second input means) (the magnitude and distribution of pressure).

  The above display driving and sensing driving are performed, for example, within one frame period. The sensing drive includes a first sensing drive and a second sensing drive. In one example, one frame period is divided into a first period and a second period. In the first period, display driving for writing video signals to all the pixels PX in the display area DA is performed in a time-division manner (display period). In the second period following the first period, sensing driving for detecting an object is performed in a time-division manner in the entire display area DA (touch detection period or sensing period).

  In another example, one frame period is further divided into a plurality of periods. The display area is divided into a plurality of blocks, and display driving and sensing driving are performed for each block. That is, in the first period of one frame period, the first display driving for writing the video signal to the pixels PX of the first display block in the display area DA is performed. In a second period following the first period, a first sensing drive for detecting an object is performed in a first sensing block of the display area DA. The first sensing block and the first display block may be the same area or different areas. In a third period following the second period, a second display drive for writing a video signal to a pixel in a second display block different from the first display block is performed. In a fourth period following the third period, a second sensing drive for detecting an object is performed in a second sensing block different from the first sensing block. As described above, the display drive and the sensing drive are alternately performed within one frame period to write the video signal to all the pixels PX of the display area DA, and it is also possible to detect an object in the entire area of the display area DA. It is possible.

For example, during one frame period, the display driving and the first sensing drive (position detection) may be alternately performed, and the last first sensing drive may be replaced with the second sensing drive (pressure detection). The liquid crystal display device DSP can use two types of input information in a complex manner by performing both the first sensing and the second sensing.
Note that the liquid crystal display device DSP may perform only one of the first sensing and the second sensing and use only one type of input information.

  Although several examples of the sensing drive have been described above, the liquid crystal display device DSP can basically obtain the position information by sensing the entire display area in one sensing period (touch detection period). it can. Alternatively, position detection and pressure detection can be performed alternately for each sensing period. Alternatively, switching between position detection and pressure detection can be performed once in a plurality of sensing periods. Alternatively, pressure detection can be performed after position detection is performed on the entire display area within one sensing period. Alternatively, within a single sensing period, position detection in the first mode (self-capacity mode), then position detection in the second mode (mutual capacitance mode), and then pressure detection can be performed.

FIG. 12 is an enlarged plan view showing a part of the third area A3 outside the display area DA of the first substrate SUB1 of the liquid crystal display panel PNL, and is a circuit diagram showing the multiplexer MU.
As shown in FIG. 12, the source line S is connected to a source line driving circuit SD via a multiplexer MU. The multiplexer MU has a plurality of control switching element groups CSWG. Each control switching element group CSWG has a plurality of control switching elements CSW. In this embodiment, each control switching element group CSWG has three control switching elements CSW. In this embodiment, the multiplexer MU is a 1/3 multiplexer.

The multiplexer MU is connected to a plurality of source lines S. The multiplexer MU is connected to the source line driving circuit SD via the connection line W. The connection line W is a line for outputting an image signal from the source line driving circuit SD to the multiplexer MU. Here, the number of connection lines W is １ ／ of the number of source lines S.
The control switching element CSW is sequentially turned on by the control signals SELR, SELG, and SELB so that three source lines S are output in a time-division manner per one output (connection line W) of the source line drive circuit SD. That is, the control switching element CSW is switched between a conductive state (ON) and a non-conductive state (OFF) by the control signals SELR, SELG, SELB. These control signals SELR, SELG, and SELB are supplied from the driving IC chip IC1 to the control switching elements CSW through a plurality of control lines (not shown).

When the control switching element CSW is turned on, transmission of a signal from the source line driving circuit SD to the source line S is permitted. An example of the signal is a video signal. On the other hand, the drive IC chip IC1 can simultaneously output the control signals SELR, SELG, and SELB for turning off (non-conducting) the control switching element CSW, and can switch all the source lines S to the electrically floating state. it can. Thereby, for example, the source line S can be set to high impedance (Hi-Z). Alternatively, the drive IC chip IC1 can simultaneously output the control signals SELR, SELG, and SELB for turning on (conducting) the control switching element CSW, and set all the source lines S to the ground potential (GND). Can be.
The liquid crystal display panel PNL may use various types of conventionally known multiplexers (selector circuits) instead of the multiplexer MU. For example, the liquid crystal display panel PNL can utilize a 1/2 multiplexer.
Further, the liquid crystal display panel PNL may be formed without the multiplexer (for example, the multiplexer MU). In this case, each source line S may be connected to the source line drive circuit SD via another control switching element. For example, by turning off all the other control switching elements, all the source lines S can be switched to an electrically floating state.

  Next, the second sensing will be described. The second sensing is performed by switching to one of the first mode (self-capacitance mode) and the second mode (mutual capacitance mode) to control the second sensor SE2. The second sensing period is a period different from the display period and the first sensing period, and deviates from the display period and the first sensing period. In order to perform the second sensing, at least one of the conductive portion CON and the sensor electrode SEE may be added to the above-described liquid crystal display device DSP. The second sensing in the second mode can be roughly classified into a first method and a second method. Here, in the second sensing, the drive target is Tx2, and the pressure information extraction target is Rx2.

<Pressure detection by the second mode (first method)>
FIG. 13 is a diagram showing, in a table, a driving target Tx2 and a target Rx2 from which pressure information is to be extracted when performing the second sensing in the second mode by the first method.

As shown in FIGS. 13 and 3, when performing the second sensing in the second mode by the first method, a drive target Tx2 and a target Rx2 from which pressure information (first input pressure information) is extracted are selected. Is done.
As the target Rx2, one of (2) the detection electrode DE and (5) the common electrode CE shown in FIG. 3 can be used.
However, the target Rx2 is not limited to the above (2) and (5), and the sensor electrode SEE can be selected as the target Rx2 by separately providing the sensor electrode SEE in the liquid crystal display device DSP. It becomes possible. Such sensor electrodes SEE include: (1) the sensor electrode SEE on the side of the cover member CG facing the second substrate SUB2, which is different from the detection electrode DE; and (3) the cover member of the second insulating substrate 20. (4) the sensor electrode SEE on the side facing the first substrate SUB1 of the second insulating substrate 20, which is the sensor electrode SEE on the side facing the CG and is different from the detection electrode DE; (6) the first insulating substrate 10 Of the sensor electrode SEE on the side facing the second substrate SUB2 and different from the common electrode CE, and (7) the sensor electrode SEE on the side of the first insulating substrate 10 facing the backlight unit BL. One can be mentioned. In this case, any one of the sensor electrodes SEE of (1), (3), (4), (6) and (7) can be added to the liquid crystal display device DSP. The position of the sensor electrode SEE in the liquid crystal display device DSP can be varied as described above.
Any one of (1) to (7) is selected as the target Rx2. When the sensor electrode SEE is selected as the target Rx2, the second sensor SE2 uses the sensor electrode SEE added to the liquid crystal display device DSP.

On the other hand, as the target Tx2, one of the (13) frame FR and the (14) housing CA shown in FIG. 3 can be used. Here, when the above (13) is selected, the frame FR functions as the conductive part CON, and when the above (14) is selected, the housing CA functions as the conductive part CON.
However, the target Tx2 is not limited to the above (13) and (14), and the conductive layer can be selected as the target Rx2 by separately providing a conductive layer in the liquid crystal display device DSP. Become. In this case, the conductive layer functions as the conductive part CON. Examples of such a conductive layer include (8) a conductive layer on the side of the brightness enhancement film BEF facing the liquid crystal display panel PNL, (9) a conductive layer between the brightness enhancement film BEF and the light diffusion sheet DI, and (10) A conductive layer between the light diffusion sheet DI and the light guide LG; (11) a conductive layer between the light guide LG and the light reflector RS; and (12) a housing CA of the light reflector RS. Side conductive layer. In this case, any one of the conductive layers (8) to (12) can be added to the liquid crystal display device DSP. The position of the conductive layer in the liquid crystal display device DSP can be varied.
Any one of (8) to (14) is selected as the target Tx2. When the conductive layers (8) to (12) are selected as the target Tx2, the second sensor SE2 uses a conductive layer added to the liquid crystal display device DSP.

For example, when the target Rx2 is (2) the detection electrode DE or (5) the common electrode CE, the second sensor SE2 is controlled as follows.
The control unit drives the conductive unit CON and transmits first input pressure information based on a change in a first distance between the conductive unit CON and one of the first electrodes of the common electrode CE and the detection electrode DE. Remove from At this time, the control unit generates a first write signal to the conductive unit CON, generates a first sensor signal between the write conductive unit CON and the first electrode, and changes the first sensor signal based on the change in the first distance. Is read from the first electrode.

On the other hand, when the target Rx2 is the sensor electrode SEE, the second sensor SE2 is controlled as follows.
The control unit drives the conductive unit CON and extracts first input pressure information based on a change in the distance between the conductive unit CON and the sensor electrode SEE from the sensor electrode SEE. At this time, the control unit generates a first write signal to the conductive unit CON and generates a first sensor signal between the write conductive unit CON and the sensor electrode SEE to indicate a change in the first sensor signal based on the change in the distance. The first read signal is read from the sensor electrode SEE.

<Pressure detection by the second mode (second method)>
FIG. 14 is a table showing, in a case where the second sensing in the second mode is performed by the second method, a drive target Tx2 and a target Rx2 from which pressure information is extracted, in a table.

As shown in FIGS. 14 and 3, when performing the second sensing in the second mode by the second method, the drive target Tx2 and the target Rx2 from which the pressure information (second input pressure information) is extracted are selected. Is done.
As the target Rx2, one of the (13) frame FR and the (14) housing CA shown in FIG. 3 can be used. Here, when the above (13) is selected, the frame FR functions as the conductive part CON, and when the above (14) is selected, the housing CA functions as the conductive part CON. However, the target Rx2 is not limited to the above (13) and (14), and the liquid crystal display device DSP may be provided with any one of the conductive layers (8) to (12) to obtain the above-described conductive property. The layer can be selected as the target Rx2. In this case, the conductive layer functions as the conductive part CON. Any one of (8) to (14) is selected as the target Rx2.
On the other hand, as the target Tx2, one of (2) the detection electrode DE and (5) the common electrode CE shown in FIG. 3 can be used. However, the target Tx2 is not limited to the above (2) and (5), but is separately provided on the liquid crystal display device DSP as (1), (3), (4), (6) and (7). By providing any one of the sensor electrodes SEE, the sensor electrode SEE can be selected as the target Tx2. Any one of (1) to (7) is selected as the target Tx2.

For example, when the target Tx2 is (2) the detection electrode DE or (5) the common electrode CE, the second sensor SE2 is controlled as follows.
The control unit drives one of the second electrode of the common electrode CE and the detection electrode DE, and outputs the second input pressure information based on a change in the second distance between the second electrode and the conductive unit CON. Remove from CON. At this time, the control unit writes a second write signal to the second electrode, generates a second sensor signal between the second electrode and the conductive part CON, and changes the second sensor signal based on the change in the second distance. Is read from the conductive part CON.

On the other hand, when the target Tx2 is the sensor electrode SEE, the second sensor SE2 is controlled as follows.
The control unit drives the sensor electrode SEE and extracts second input pressure information from the conductive unit CON based on a change in the distance between the sensor electrode SEE and the conductive unit CON. At this time, the control unit generates a second write signal to the sensor electrode SEE and generates a second sensor signal between the write sensor electrode SEE and the conductive part CON to indicate a change in the second sensor signal based on the change in the distance. The second read signal is read from the conductive part CON.

<Pressure detection by the first mode>
FIG. 15 is a table showing, in the case of performing the second sensing in the first mode, a drive target Tx2, a target Rx2 for extracting pressure information, and a ground potential target (conductive part CON).

As shown in FIGS. 15 and 3, in the second sensing in the first mode, a drive target Tx2, a target Rx2 for extracting pressure information (first input pressure information), and a ground potential target (conductive part CON). Is selected. Here, the target Tx2 to be driven is the same as the target Rx2 from which the pressure information is extracted.
As the target Tx2 and the target Rx2, one of (2) the detection electrode DE and (5) the common electrode CE already shown in FIG. 3 can be used. However, the targets Tx2 and Rx2 are not limited to the above (2) and (5), but are separately provided on the liquid crystal display device DSP by (1), (3), (4), (6) and (7). By providing any one of the sensor electrodes SEE), the sensor electrode SEE can be selected as the target Tx2 or Rx2. Any one of (1) to (7) is selected as the target Tx2, Rx2.
On the other hand, as the conductive portion CON, one of the (13) frame FR and the (14) housing CA shown in FIG. 3 can be used. However, the conductive part CON is not limited to the above (13) and (14), but can be obtained by separately providing any one of the conductive layers (8) to (12) in the liquid crystal display device DSP. The conductive layer can be selected as the conductive part CON. Any one of (8) to (14) is selected as the conductive part CON.

  When the conductive layer (8) to (12) is selected as the conductive part CON, the conductive layer is connected to the ground part (GND) of the control module CM via the flexible wiring board, so that the conductive layer is connected to the ground potential. Can be set to (13) When the frame FR is selected as the conductive part CON, the frame R is connected to the ground part (GND) of the control module CM or to the casing CA as necessary, so that the conductive layer Can be set to the ground potential. When (14) the housing CA is selected as the conductive portion CON, the housing CA can be connected to the ground portion (GND) of the control module CM as needed.

For example, when the targets Tx2 and Rx2 are (2) the detection electrode DE or (5) the common electrode CE, the second sensor SE2 is controlled as follows.
The control unit drives a third electrode of one of the common electrode CE and the detection electrode DE, and outputs third input pressure information based on a change in a third distance between the third electrode and the conductive unit CON. Remove from electrode. At this time, the control unit writes a third write signal to the third electrode, generates a third sensor signal between the third electrode and the conductive unit CON, and changes the third sensor signal based on the change in the third distance. Is read from the third electrode.

On the other hand, when the targets Tx2 and Rx2 are the sensor electrodes SEE, the second sensor SE2 is controlled as follows.
The control unit drives the sensor electrode SEE and extracts third input pressure information based on a change in the distance between the sensor electrode SEE and the conductive unit CON from the conductive unit CON. At this time, the control unit generates a third write signal to the sensor electrode SEE and generates a third sensor signal between the write sensor electrode SEE and the conductive part CON to indicate a change in the third sensor signal based on the change in the distance. The second read signal is read from the sensor electrode SEE.

  Next, several examples of the above-described liquid crystal display device with sensor DSP will be illustratively described. In each embodiment, a method of driving the liquid crystal display device DSP will be described as appropriate.

(Example 1)
First, the configuration of the liquid crystal display device DSP according to the first embodiment will be described.
FIG. 16 is a cross-sectional view illustrating the configuration of the sensor-equipped liquid crystal display device DSP according to the first embodiment. As shown in FIG. 16, the liquid crystal display device DSP further includes a conductive layer CL. The conductive layer CL is provided on the side of the light reflection pair RS facing the housing. The flexible wiring board FPC3 has a first branch part FB1 and a second branch part FB2. The first branch portion FB1 is connected to the light source LS (backlight unit BL). The second branch portion FB2 is connected to the conductive layer CL.

In the first embodiment, when detecting the pressure information, the second sensing in the second mode is performed by the second method. The drive target Tx2 and the target Rx2 from which the pressure information is extracted, which form the second sensor SE2, are as follows.
Tx2: common electrode CE (common electrode of (5) in FIG. 14)
Rx2: conductive layer CL (conductive layer (12) in FIG. 14)
The backlight unit BL is arranged at an interval on the liquid crystal display panel PNL. In the first embodiment, an air layer or a resin layer is interposed between the liquid crystal display panel PNL and the conductive layer CL. The conductive layer CL is arranged at an interval from the common electrode CE. At least a part of the space between the conductive layer CL and the common electrode CE is formed by the air layer or the resin layer. Due to the presence of the air layer and the resin layer having a male restoring force, the distance between the conductive layer CL and the common electrode CE can be changed according to the magnitude of the load applied to the input surface IS. When the load applied to the input surface IS is removed, the distance between the conductive layer CL and the common electrode CE can return to the original distance as time passes. Here, the distance (second distance) from the conductive layer CL to the common electrode CE is d2. The distance d2 is a distance in the third direction Z, and is a distance from a surface of the conductive layer CL facing the common electrode CE to a surface of the common electrode CE facing the conductive layer CL. The distance d2 changes according to the magnitude of the force (pressing force) applied to the cover member CG and the position where the force is applied.

  Further, a capacitance Cp2 exists between the common electrode CE and the conductive layer CL. That is, the conductive layer CL is capacitively coupled to the common electrode CE. Therefore, pressure information can be detected by detecting a change in the capacitance Cp2 corresponding to the distance d2. For this reason, the driving unit (the driving IC chip IC1) drives the common electrode CE, and the detecting unit (the driving IC chip IC1, the driving IC chip IC2, or the control module CM) generates pressure information (second input) based on the change in the distance d2. Pressure information) is extracted from the conductive layer CL. Specifically, the drive unit writes the second write signal Vw2 to the common electrode CE, and the detection unit generates a second sensor signal between the common electrode CE and the conductive layer CL to generate a second sensor signal based on a change in the distance d2. Is read from the conductive layer CL.

FIG. 17 is a plan view showing the conductive layer CL and the light reflector RS shown in FIG. FIG. 17 is a plan view of the conductive layer CL and the like viewed from the third direction Z.
As shown in FIG. 17, in the first embodiment, the conductive layer CL as the conductive part CON has a plurality of divided parts CL1. The plurality of divided portions CL1 are each formed in a belt shape, extend in the second direction Y, and are arranged at intervals in the first direction X. The division part CL1 intersects with the division electrode C. For this reason, the capacitance Cp2 is formed at each intersection between the divided part CL1 and the divided electrode C. The conductive layer CL can be formed of a transparent conductive material such as ITO, IZO, and ZnO. In the first embodiment, since the conductive layer CL is located closer to the housing CA than the light reflector RS, the conductive layer CL can be formed of a conductive material having a low light transmittance such as a metal. This is because even if the conductive layer CL is formed of metal or the like, the adverse effect on the visibility of the displayed image is small.

  Further, the dividing part CL1 may be indirectly connected to the second branch part FB2 via a lead wire (not shown). In this case, the plurality of lead wires are concentrated in a part of the area, so that the size of the second branch portion FB2 can be reduced. The lead wire may be formed of a transparent conductive material similarly to the division part CL1, but may be formed of metal instead of the transparent conductive material.

Next, a method of driving the liquid crystal display device DSP according to the first embodiment will be described.
First, the first sensing drive in the second mode will be described. Here, a case will be described as an example where the first sensing drive in the second mode is performed during a plurality of successive display drives. Here, one display drive is a display drive in one horizontal scanning period, and means that one row of pixels PX arranged in the first direction X is driven.

  FIG. 18 is a timing chart for explaining a method of driving the liquid crystal display device DSP according to the first embodiment. The control signal SEL, the video signal Vsig, and the common drive in the first period of the F-th one frame period are shown. FIG. 3 is a diagram illustrating a signal Vcom, a write signal Vw0, and a read signal Vr0.

  As shown in FIG. 18 and FIGS. 16 and 17, in the first period of the F-frame period, which is the F-th one-frame period, the control unit (the driving IC chip IC1, the driving IC chip IC2, and the control module CM) The display driving in each display period Pd and the first sensing drive in the first sensing period Ps1 are performed.

  In each display period Pd, the driving IC chip IC1 drives the plurality of source lines S in a time-sharing manner by the control signals SELR, SELG, and SELB, the source line driving circuit SD outputs the video signal Vsig, and the common electrode driving circuit CD is common. The common drive signal Vcom is applied to the electrodes (the plurality of divided electrodes C) to drive the liquid crystal display panel PNL. Here, the source line S (3i-2) is connected to the red pixel PX, and the control signal SELR is used to switch the connection relationship between the source line S (3i-2) and the source line driving circuit SD. . The source line S (3i-1) is connected to the green pixel PX, and the control signal SELG is used to switch the connection relationship between the source line S (3i-1) and the source line driving circuit SD. The source line S (3i) is connected to the blue pixel PX, and the control signal SELB is used to switch the connection between the source line S (3i) and the source line driving circuit SD. In the display period Pd, the detection electrode DE and the conductive layer CL are fixed, for example, in an electrically floating state.

In the first sensing period Ps1, the drive IC chip IC1 maintains the control switching element CSW in a non-conductive state by the control signals SELR, SELG, and SELB, and brings all the source lines S into an electrically floating state (high-impedance). .
During the first sensing period Ps1, the common electrode CE (Tx1) of the first sensor SE1 is driven. When driving the first sensor SE1, the common electrode drive circuit CD writes a write signal (sensor drive signal) Vw0 to at least one of the divided electrodes C. Note that the write signal Vw0 is a pulse signal. For example, the low-level potential of the write signal Vw0 is the same as the potential of the common drive signal Vcom.

  The drive IC chip IC2 reads the read signal Vr0 from the detection electrode DE during the first sensing period Ps1. That is, the position information of the input location can be extracted from the detection electrode DE (Rx1). The read signal Vr0 is a signal indicating a change in the sensor signal generated between the divided electrode C and the detection electrode DE. For example, the read signal Vr0 is a signal indicating a change in a sensor signal generated between the divided electrode C and the detection electrode DE. In the first sensing period Ps1, the conductive layer CL is fixed, for example, in an electrically floating state.

Next, the second sensing drive in the second mode performed by the second method will be described. Here, a case will be described as an example where the second sensing drive is performed during a plurality of successive display drives.
FIG. 19 is a timing chart for explaining a driving method of the liquid crystal display device DSP according to the first embodiment. The control signal SEL, the video signal Vsig, and the common driving in the second period of the F-th one frame period are shown. FIG. 4 is a diagram illustrating a signal Vcom, a second write signal Vw2, and a second read signal Vr2.

As shown in FIG. 19 and FIGS. 16 and 17, in the second period of the F frame period, the control unit (the driving IC chip IC1, the driving IC chip IC2, and the control module CM) performs the display driving in each display period Pd. And the second sensing drive in the second sensing period Ps2.
The display drive in each display period Pd is the same as the display drive described with reference to FIG.

In the second sensing period Ps2, the drive IC chip IC1 maintains the control switching element CSW in a non-conductive state by the control signals SELR, SELG, and SELB, and brings all the source lines S into an electrically floating state (high-impedance). .
In the second sensing period Ps2, the common electrode CE (Tx2) of the second sensor SE2 is driven. When driving the second sensor SE2, the common electrode drive circuit CD writes the second write signal (second sensor drive signal) Vw2 to one, a plurality, or all of the divided electrodes C. Note that the second write signal Vw2 is a pulse signal. For example, the low-level potential of the second write signal Vw2 is the same as the potential of the common drive signal Vcom.

  The detection unit (the driving IC chip IC1, the driving IC chip IC2, or the control module CM) transmits the second read signal Vr2 from the conductive layer CL (one or a plurality or all of the divided units CL1) during the second sensing period Ps2. Read. That is, pressure information (second input pressure information) of the pressed location can be extracted from the conductive layer CL (Rx2). The second read signal Vr2 is a signal indicating a change in the second sensor signal generated between the divided electrode C and the divided part CL1. For example, the second read signal Vr2 is a signal indicating a change in the second sensor signal generated between the divided electrode C and the divided part CL1. Note that, in the second sensing period Ps2, the detection electrode DE is fixed, for example, in an electrically floating state.

(Example 2)
Next, a configuration of the liquid crystal display device DSP according to the second embodiment will be described.
FIG. 20 is a cross-sectional view illustrating a configuration of a liquid crystal display device with a sensor DSP according to the second embodiment.

As shown in FIG. 20, the casing CA is formed of aluminum as a conductive material. The potential of the casing CA is a ground potential of a ground portion (GND) of the control module CM. In the second embodiment, when detecting the pressure information, the second sensing in the first mode is performed. The target Tx2 to be driven, the target Rx2 from which the pressure information is extracted, and the target of the ground potential (conductive part CON) forming the second sensor SE2 are as follows.
Tx2: common electrode CE (common electrode of (5) in FIG. 15)
Rx2: common electrode CE (common electrode of (5) in FIG. 15)
CON: Case CA (case (14) in FIG. 15)
The housing CA is arranged on the liquid crystal display panel PNL with an interval. In the second embodiment, an air layer or a resin layer is interposed between the liquid crystal display panel PNL and the casing CA. That is, the liquid crystal display device DSP has at least one of an air layer or a resin layer between the liquid crystal display panel PNL and the backlight unit BL and an air layer or a resin layer between the backlight unit BL and the casing CA. have. At least a part of the interval between the casing CA and the common electrode CE is formed by the air layer or the resin layer. Due to the presence of the air layer and the resin layer, the distance between the casing CA and the common electrode CE can be changed according to the magnitude of the load applied to the input surface IS. Further, when the load applied to the input surface IS is removed, the interval between the casing CA and the common electrode CE can be returned to the original interval as time passes. Here, the distance (third distance) from the casing CA to the common electrode CE is d3. The distance d3 is a distance in the third direction Z, and is a distance from the surface of the casing CA on the side facing the common electrode CE to the surface of the common electrode CE on the side facing the casing CA. The distance d3 changes according to the magnitude of the force (pressing force) applied to the cover member CG and the position where the force is applied.

  Further, a capacitance Cp3 exists between the common electrode CE and the housing CA. That is, the common electrode CE is capacitively coupled to the housing CA. Therefore, pressure information can be detected by detecting a change in the capacitance Cp3 corresponding to the distance d3. For this reason, the drive unit (drive IC chip IC1) drives the common electrode CE, and the detection unit (drive IC chip IC1) extracts pressure information (third input pressure information) based on the change in the distance d3 from the common electrode CE. . More specifically, the driving unit writes a third write signal Vw3 to the common electrode CE, and the detection unit generates a third sensor signal between the common electrode CE and the casing CA to generate a third sensor signal based on a change in the distance d3. Is read from the common electrode CE.

Next, a method for driving the liquid crystal display device DSP according to the second embodiment will be described.
First, the first sensing drive in the second mode will be described.
FIG. 21 is a timing chart for explaining a method of driving the liquid crystal display device DSP according to the second embodiment. The control signal SEL, the video signal Vsig, and the common drive in the first period of the F-th one frame period are shown. FIG. 3 is a diagram illustrating a signal Vcom, a write signal Vw0, and a read signal Vr0.

  As shown in FIGS. 21 and 20, in the first period of the F-frame period, which is the F-th one-frame period, the control unit (the driving IC chip IC1, the driving IC chip IC2, and the control module CM) operates in each display period. The display drive in Pd and the first sensing drive in the first sensing period Ps1 are performed. Note that the display drive and the first sensing drive in the second embodiment are performed in the same manner as the display drive and the first sensing drive in the first embodiment. Note that the potential of the casing CA is the ground potential of the ground portion (GND) of the control module CM.

Next, the second sensing drive in the first mode will be described. Here, a case will be described as an example where the second sensing drive is performed during a plurality of successive display drives.
FIG. 22 is a timing chart for explaining a method of driving the liquid crystal display device DSP according to the second embodiment. The control signal SEL, the video signal Vsig, and the common drive in the second period of the F-th one frame period are shown. FIG. 9 is a diagram illustrating a signal Vcom, a third write signal Vw3, and a third read signal Vr3.

As shown in FIGS. 22 and 20, in the second period of the F frame period, the control unit (the driving IC chip IC1, the driving IC chip IC2, and the control module CM) performs the display driving in each display period Pd and the second driving period. And second sensing driving in the sensing period Ps2.
The display drive in each display period Pd is the same as the display drive described above.

In the second sensing period Ps2, the drive IC chip IC1 maintains the control switching element CSW in a non-conductive state by the control signals SELR, SELG, and SELB, and brings all the source lines S into an electrically floating state (high-impedance). .
In the second sensing period Ps2, the common electrode CE (Tx2) of the second sensor SE2 is driven. When driving the second sensor SE2, the common electrode drive circuit CD writes the third write signal (third sensor drive signal) Vw3 to one, a plurality, or all of the divided electrodes C. Note that the third write signal Vw3 is a pulse signal. For example, the low-level potential of the third write signal Vw3 is the same as the potential of the common drive signal Vcom.

  During the second sensing period Ps2, the detection unit (the driving IC chip IC1, the driving IC chip IC2, or the control module CM) reads the third read signal from the common electrode CE (one or more or all of the above-mentioned divided electrodes C). Read Vr3. That is, the pressure information (third input pressure information) of the pressed location can be extracted from the common electrode CE (Rx2). The third read signal Vr3 is a signal indicating a change in the third sensor signal generated between the divided electrode C and the housing CA. For example, the third read signal Vr3 is a signal indicating a change in the third sensor signal generated between the divided electrode C and the housing CA. Note that, in the second sensing period Ps2, the detection electrode DE is fixed, for example, in an electrically floating state. Note that the potential of the casing CA is the ground potential of the ground portion (GND) of the control module CM.

(Example 3)
Next, the configuration of the liquid crystal display device DSP according to the third embodiment will be described.
FIG. 23 is a cross-sectional view illustrating a configuration of a liquid crystal display device with a sensor DSP according to the third embodiment. As shown in FIG. 23, the liquid crystal display device DSP further includes a sensor electrode SEE. The sensor electrode SEE is provided on the side of the first insulating substrate 10 facing the backlight unit BL. The flexible wiring board FPC3 has a first branch part FB1 and a second branch part FB2. The first branch portion FB1 is connected to the light source LS (backlight unit BL). The second branch portion FB2 is connected to the sensor electrode SEE. The housing CA is formed of aluminum as a conductive material. The potential of the casing CA is a ground potential of a ground portion (GND) of the control module CM.

In the third embodiment, when detecting the pressure information, the second sensing in the first mode is performed. The target Tx2 to be driven, the target Rx2 from which the pressure information is extracted, and the target of the ground potential (conductive part CON) forming the second sensor SE2 are as follows.
Tx2: sensor electrode SEE (sensor electrode of (7) in FIG. 15)
Rx2: sensor electrode SEE (sensor electrode of (7) in FIG. 15)
CON: Case CA (case (14) in FIG. 15)
The housing CA is arranged on the liquid crystal display panel PNL with an interval. In the third embodiment, an air layer or a resin layer is interposed between the liquid crystal display panel PNL and the casing CA. That is, the liquid crystal display device DSP has at least one of an air layer or a resin layer between the liquid crystal display panel PNL and the backlight unit BL and an air layer or a resin layer between the backlight unit BL and the casing CA. have. At least a part of the space between the casing CA and the sensor electrode SEE is formed of the air layer or the resin layer. Due to the presence of the air layer or the resin layer, the distance between the casing CA and the sensor electrode SEE can be changed according to the magnitude of the load applied to the input surface IS. Further, when the load applied to the input surface IS is removed, the distance between the housing CA and the sensor electrode SEE can return to the original distance as time passes. Here, the distance (third distance) from the housing CA to the sensor electrode SEE is d3. The distance d3 is a distance in the third direction Z, and is a distance from the surface of the housing CA facing the sensor electrode SEE to the surface of the sensor electrode SEE facing the housing CA. The distance d3 changes according to the magnitude of the force (pressing force) applied to the cover member CG and the position where the force is applied.

  Further, a capacitance Cp3 exists between the sensor electrode SEE and the housing CA. That is, the sensor electrode SEE is capacitively coupled to the housing CA. Therefore, pressure information can be detected by detecting a change in the capacitance Cp3 corresponding to the distance d3. Therefore, the driving unit (the driving IC chip IC1, the driving IC chip IC2, or the control module CM) drives the sensor electrode SEE, and the detecting unit (the driving IC chip IC1, the driving IC chip IC2, or the control module CM) moves the distance d3. The pressure information (third input pressure information) based on the change in is extracted from the sensor electrode SEE. More specifically, the driving unit writes a third write signal Vw3 to the sensor electrode SEE, and the detection unit generates a third sensor signal between the sensor electrode SEE and the housing CA to generate a third sensor signal based on a change in the distance d3. Is read from the sensor electrode SEE.

FIG. 24 is a plan view showing the sensor electrode SEE and the housing CA shown in FIG. FIG. 24 is a plan view of the sensor electrode SEE and the like as viewed from the direction opposite to the third direction Z.
As shown in FIG. 24, in the third embodiment, the sensor electrode SEE has a plurality of divided electrodes SEE1. The plurality of divided electrodes SEE1 are each formed in a rectangular shape, and are arranged in a matrix at intervals in the first direction X and the second direction Y. Therefore, the capacitance Cp3 is formed between each divided electrode SEE1 and the housing CA. The sensor electrode SEE is formed of a transparent conductive material such as ITO, IZO, and ZnO.
Further, the split electrode SEE1 may be indirectly connected to the second branch portion FB2 via a lead wire (not shown). The lead wire may be formed of a transparent conductive material like the split electrode SEE1, but may be formed of metal instead of the transparent conductive material. Note that the housing CA has a conductive surface that is continuously formed to face the plurality of divided electrodes SEE1.

Next, a method of driving the liquid crystal display device DSP according to the third embodiment will be described.
First, the first sensing drive in the second mode will be described.
FIG. 25 is a timing chart for explaining a driving method of the liquid crystal display device DSP according to the third embodiment. The control signal SEL, the video signal Vsig, and the common drive in the first period of the F-th one frame period are shown. FIG. 3 is a diagram illustrating a signal Vcom, a write signal Vw0, and a read signal Vr0.

  As shown in FIGS. 25, 23, and 24, in the first period of the F-frame period, which is the F-th one-frame period, the control unit (the driving IC chip IC1, the driving IC chip IC2, and the control module CM) The display driving in each display period Pd and the first sensing drive in the first sensing period Ps1 are performed. The display drive and the first sensing drive in the third embodiment are performed in the same manner as the display drive and the first sensing drive in the first and second embodiments. Note that the potential of the casing CA is the ground potential of the ground portion (GND) of the control module CM.

Next, the second sensing drive in the first mode will be described. Here, a case will be described as an example where the second sensing drive is performed during a plurality of successive display drives.
FIG. 26 is a timing chart for explaining a method of driving the liquid crystal display device DSP according to the third embodiment. The control signal SEL, the video signal Vsig, and the common drive in the second period of the F-th one frame period are shown. FIG. 9 is a diagram illustrating a signal Vcom, a third write signal Vw3, and a third read signal Vr3.

As shown in FIGS. 26, 23, and 24, in the second period of the F frame period, the control unit (the driving IC chip IC1, the driving IC chip IC2, and the control module CM) performs the display driving in each display period Pd. And the second sensing drive in the second sensing period Ps2.
The display drive in each display period Pd is the same as the display drive described above.

In the second sensing period Ps2, the drive IC chip IC1 maintains the control switching element CSW in a non-conductive state by the control signals SELR, SELG, and SELB, and brings all the source lines S into an electrically floating state (high-impedance). .
In the second sensing period Ps2, the sensor electrode SEE (Tx2) of the second sensor SE2 is driven. When driving the second sensor SE2, the driving unit (the driving IC chip IC1, the driving IC chip IC2, or the control module CM) applies a third write signal (third sensor driving) to one or more or all of the divided electrodes SEE1. Signal) Vw3 is written. Note that the third write signal Vw3 is a pulse signal. For example, the low-level potential of the third write signal Vw3 is the same as the potential of the common drive signal Vcom.

  During the second sensing period Ps2, the detection unit (the driving IC chip IC1, the driving IC chip IC2, or the control module CM) outputs the third read signal from the sensor electrode SEE (one or more or all of the above-described divided electrodes SEE1). Read Vr3. That is, pressure information (third input pressure information) of the pressed location can be extracted from the sensor electrode SEE (Rx2). The third read signal Vr3 is a signal indicating a change in the third sensor signal generated between the sensor electrode SEE and the casing CA. For example, the third read signal Vr3 is a signal indicating a change in the third sensor signal generated between the divided electrode SEE1 and the housing CA. Note that, in the second sensing period Ps2, the detection electrode DE is fixed, for example, in an electrically floating state. Note that the potential of the casing CA is the ground potential of the ground portion (GND) of the control module CM.

  According to the sensor-equipped liquid crystal display device DSP and the driving method thereof according to the embodiment configured as described above, the liquid crystal display device DSP has two types of sensors, the first sensor SE1 and the second sensor SE2. . The first sensor SE1 can detect position information of a place where a finger or the like has touched or approached the input surface IS. The second sensor SE2 can detect the magnitude of the force (pressing force) applied to the input surface IS. Depending on the configuration of the second sensor SE2, the second sensor SE2 can also detect a position on the input surface IS where a force is applied.

For example, the liquid crystal display device DSP capable of performing the first sensing using the first sensor SE1 and the second sensing using the second sensor SE2 enables use of various applications. Some applications will be described by way of example.
(Application 1)
As shown in FIG. 27, when characters are input on the input surface IS of the liquid crystal display device DSP using the pen functioning as the first input means and the second input means, the liquid crystal display device DSP Can also be displayed. In this example, when a line is input to the input surface IS with a low writing pressure, the liquid crystal display device DSP displays a line L1 having a small width. On the other hand, when a line is input to the input surface IS with a high pen pressure, the liquid crystal display device DSP displays a line L2 having a width relatively larger than the line L1. The liquid crystal display device DSP can display an image (video) as if it were written with a brush.
(Application 2)
As shown in FIG. 28, when a finger is pressed into a certain area of the input surface IS, the liquid crystal display device DSP can specify the position and pressure of the pressed point. The liquid crystal display device DSP can cope with pressing by two (a plurality of) fingers.
As described above, it is possible to obtain a liquid crystal display device with a sensor DSP capable of detecting an input position and an input pressure and a driving method thereof.

  Although the embodiment of the present invention has been described, the above-described embodiment has been presented by way of example and is not intended to limit the scope of the invention. These new embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and their equivalents.

For example, the shapes of the conductive layer CL and the sensor electrode SEE are not limited to the examples described above, but can be variously modified. Here, the sensor electrode SEE will be described as a representative example.
As shown in FIG. 29, the sensor electrode SEE may have a plurality of divided electrodes SEE1 located outside the display area DA. Here, the divided electrodes SEE1 are arranged at four corners of the input surface IS. In this case, the sensor electrode SEE can be formed of a transparent conductive material or a conductive material having low light transmittance. Each divided electrode SEE1 is driven, and pressure information is extracted from each divided electrode SEE1.
When it is necessary to arrange at least a part of the divided electrode SEE1 in the display area DA, a dummy unit may be arranged in the display area DA at an interval from the divided electrode SEE1. The dummy section is in an electrically floating state. In this case, by forming the divided electrode SEE1 and the dummy portion with a transparent conductive material, it is possible to make it difficult for a user to visually recognize the contour of the divided electrode SEE1, the shape of the divided electrode SEE1, and the like.
Further, the sensor electrode SEE may have five or more divided electrodes SEE1, and by increasing the number of divided electrodes SEE1, pressure information at an arbitrary position can be detected.
As shown in FIG. 30, the sensor electrode SEE may be located outside the display area DA and formed in a rectangular frame shape. Note that at least a part of the sensor electrode SEE may be located in the display area DA.
As shown in FIG. 31, the sensor electrode SEE may be a single plate electrode formed continuously in the display area DA without being divided.

  The split electrode C may extend in the second direction Y, and the detection electrode DE may extend in the first direction X. As described above, the air layer may be interposed between objects in order to change the distance d such as the distances d2 and d3 described above, but instead of the air layer, the resin layer may be used. May be interposed. Further, the member interposed between the objects is not limited to the resin layer, and may be an elastic insulating member.

The driving IC chip IC1 and the driving IC chip IC2 may be formed integrally. That is, the driving IC chip IC1 and the driving IC chip IC2 may be integrated into a single driving IC chip. In this case, the single drive IC chip drives the liquid crystal display panel PNL, the first sensor SE1 and the second sensor SE2, detects position information from the first sensor SE1, and detects pressure information from the second sensor SE2. Should be detected or if possible.
The above-described control unit is not limited to the drive IC chips IC1 and IC2 and the control module CM, but can be variously modified, and electrically controls the liquid crystal display panel PNL, the first sensor SE1, and the second sensor SE2. Anything that can do it is acceptable.

In the above-described embodiment, a liquid crystal display device is disclosed as an example of the display device. However, the embodiments described above are applicable to any flat panel display device such as an organic EL (electroluminescent) display device, another self-luminous display device, or an electronic paper display device having an electrophoretic element or the like. . In addition, it is needless to say that the above-described embodiments can be applied without limitation to a small-sized display device to a large-sized display device.
Hereinafter, the invention described in the original application of the present application will be additionally described.
[1] A display panel having a common electrode, a detection electrode, a conductive unit disposed at intervals between the display panel and the detection electrode, and a control unit,
The control unit includes:
The common electrode is driven during a display period for displaying an image,
In a first sensing period deviating from the display period, the common electrode or the detection electrode is driven to extract input position information from the detection electrode,
In the display period and the second sensing period deviating from the first sensing period,
Driving the conductive portion and extracting first input pressure information from the first electrode based on a change in a first distance between the conductive portion and a first electrode of one of the common electrode and the detection electrode, or
Driving a second electrode of one of the common electrode and the detection electrode to extract second input pressure information from the conductive portion based on a change in a second distance between the second electrode and the conductive portion, or
Driving a third electrode of either the common electrode or the detection electrode to extract third input pressure information from the third electrode based on a change in a third distance between the third electrode and the conductive portion;
Display device with sensor.
[2] The control unit includes:
When extracting the second input pressure information from the conductive portion, a second write signal is written to the common electrode, a second sensor signal is generated between the common electrode and the conductive portion, and a second sensor signal is generated based on the change in the second distance. Reading a second read signal indicating a change in the second sensor signal from the conductive portion,
The display device with a sensor according to [1].
[3] The control unit includes:
When extracting the third input pressure information from the common electrode, a third write signal is written to the common electrode, a third sensor signal is generated between the common electrode and the conductive part, and a third sensor signal is generated based on the change in the third distance. Reading a third read signal indicating a change in the third sensor signal from the common electrode.
The display device with a sensor according to [1].
[4] The conductive unit is set to a ground potential when extracting the third input pressure information from the common electrode.
The display device with a sensor according to [3].
[5] a light guide disposed opposite to the display panel at an interval, and positioned between the display panel and the conductive portion; a light source for emitting light to the light guide; and the light guide. A light reflector positioned between the conductive unit and the display unit, further comprising a backlight unit that emits light to the display panel,
The display panel includes: a first substrate located between the backlight unit and the common electrode; and a second substrate facing the first substrate and located between the common electrode and the detection electrode. Have,
The display device with a sensor according to [1].
[6] The common electrode has a plurality of divided electrodes each extending in the first direction and arranged at intervals from each other,
The conductive portion has a plurality of divided portions that extend in a second direction that intersects the first direction and are arranged at intervals.
The control unit includes:
When extracting the first input pressure information from the common electrode, at least one of the plurality of divided portions is driven, and the first input pressure information is extracted from at least one of the plurality of divided electrodes, or the second input pressure is extracted. When extracting information from the conductive portion, at least one of the plurality of divided electrodes is driven, and the second input pressure information is extracted from at least one of the plurality of divided portions.
The display device with a sensor according to [5].
[7] a backlight unit that is disposed to face the display panel at an interval and emits light to the display panel;
The display panel includes: a first substrate located between the backlight unit and the common electrode; and a second substrate facing the first substrate and located between the common electrode and the detection electrode. Have
The conductive unit is a housing that houses the display panel, the detection electrode, the control unit, and the backlight unit.
The display device with a sensor according to [1].
[8] A display panel having a common electrode, a detection electrode, a sensor electrode, a conductive part disposed at intervals between the display panel, the detection electrode and the sensor electrode, and a control part,
The control unit includes:
The common electrode is driven during a display period for displaying an image,
In a first sensing period deviating from the display period, the common electrode or the detection electrode is driven to extract input position information from the detection electrode,
In the display period and the second sensing period deviating from the first sensing period,
Driving the conductive portion and extracting first input pressure information from the sensor electrode based on a change in the distance between the conductive portion and the sensor electrode, or
Driving the sensor electrode and extracting second input pressure information based on the change in the distance from the conductive portion, or
Driving the sensor electrode and extracting third input pressure information based on the change in the distance from the sensor electrode;
Display device with sensor.
[9] The control unit includes:
When extracting the third input pressure information from the sensor electrode, a third write signal is written to the sensor electrode, a third sensor signal is generated between the sensor electrode and the conductive portion, and the third write signal is generated based on the change in the distance. Reading a third read signal indicating a change in a third sensor signal from the sensor electrode;
The display device with a sensor according to [8].
[10] The conductive unit is set to a ground potential when extracting the third input pressure information from the sensor electrode.
The display device with a sensor according to [9].
[11] The display panel includes a first substrate located between the sensor electrode and the common electrode, and a second substrate facing the first substrate and located between the common electrode and the detection electrode. , And
The sensor electrode is located on a side of the first substrate facing the conductive portion,
The conductive unit is a housing that houses the display panel, the detection electrode, and the control unit.
The display device with a sensor according to [8].
[12] The sensor electrode has a plurality of divided electrodes arranged at intervals from each other,
The conductive portion is formed continuously facing the plurality of divided electrodes,
The control unit drives at least one of the plurality of divided electrodes when extracting the third input pressure information from the sensor electrode, and extracts the third input pressure information from the driven divided electrode.
The display device with a sensor according to [11].
[13] At least a part of the space is formed by an air layer interposed between the display panel and the conductive portion.
The display device with a sensor according to [1] or [8].
[14] The control unit includes:
When driving the common electrode during the display period, applying a common drive signal to the common electrode,
When extracting the input position information from the detection electrode, drive the common electrode to extract the input position information from the detection electrode,
The display device with a sensor according to [1] or [8].

  DSP: liquid crystal display device, PNL: liquid crystal display panel, SUB1: first substrate, 10: first insulating substrate, PX: pixel, CE: common electrode, C: split electrode, PE: pixel electrode, SUB2: second substrate, Reference numeral 20: second insulating substrate, SE1: first sensor, D: detecting section, DE: detecting electrode, SE2: second sensor, CON: conductive section, CL: conductive layer, CL1: dividing section, SEE: sensor electrode, SEE1 ... Divided electrodes, BL: Backlight unit, CA: Housing, CG: Cover member, IC1, IC2: Drive IC chip, CM: Control module, CD: Common electrode drive circuit, DA: Display area, NDA: Non-display area , D: distance, X: first direction, Y: second direction, Z: third direction.

Claims (5)

A display panel having a common electrode and a plurality of source lines , a detection electrode, a conductive unit disposed at an interval between the display panel and the detection electrode, and a control unit,
The control unit includes:
Driving the common electrode using a common drive signal during a display period for displaying an image,
Wherein the first sensing period out of the display period, remove the input position information from the detection electrodes to drive the common electrodes using a first sensor drive signal,
The display period and the second sensing period deviating from the first sensing period, based on a change in the second distance between the common collector drives electrode and the common electrode and the conductive portion using a second sensor drive signal the second input pressure information Eject from the conductive portion,
The display device with the sensor , wherein the control unit switches all the source lines to an electrically floating state in the first and second sensing periods . A light guide that is disposed to face the display panel at an interval and is located between the display panel and the conductive part, a light source that emits light to the light guide, the light guide and the conductive part A light reflector positioned between the display panel, and a backlight unit that emits light to the display panel,
The display panel includes: a first substrate located between the backlight unit and the common electrode; and a second substrate facing the first substrate and located between the common electrode and the detection electrode. Have,
A display device with a sensor according to claim 1. The common electrode has a plurality of divided electrodes extending in the first direction and arranged at intervals from each other,
The conductive portion has a plurality of divided portions that extend in a second direction that intersects the first direction and are arranged at intervals.
The control unit includes:
When extracting the second input pressure information from the conductive portion, at least one of the plurality of divided electrodes is driven, and the second input pressure information is extracted from at least one of the plurality of divided portions.
A display device with a sensor according to claim 2 . A backlight unit that is disposed to face the display panel at an interval and emits light to the display panel,
The display panel includes: a first substrate located between the backlight unit and the common electrode; and a second substrate facing the first substrate and located between the common electrode and the detection electrode. Have
The conductive unit is a housing that houses the display panel, the detection electrode, the control unit, and the backlight unit.
A display device with a sensor according to claim 1. At least a part of the interval is formed of an air layer interposed between the display panel and the conductive portion,
A display device with a sensor according to claim 1.

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