JP2015018331A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device incorporating a touch panel function that has high reading performance and can reduce costs.SOLUTION: A display device includes: an array substrate 7 that has a plurality of pixel electrodes or light emitting elements arranged in matrix; an opposing substrate 8 that is arranged opposite to the array substrate and has a black matrix; a plurality of transparent first electrode groups 20a that extend in a first direction; a plurality of transparent second electrode groups 20b that extend in a second direction intersecting the first direction; a drive circuit 21 that supplies drive signals to the first electrode group; and a detection circuit that acquires touch detection signals corresponding to the drive signals from the second electrode group. The second electrode group is formed on one layer of the opposing substrate, the first electrode group is formed on one layer of the array substrate or of the opposing substrate, and the touch detection signals are transmitted from the opposing substrate side to the array substrate side through capacitive coupling (25a, 25b).

Description

  Embodiments described herein relate generally to a display device.

  Electronic devices such as mobile phones, personal digital assistants, and personal computers equipped with a display device having a touch panel function have been developed as a form of user interface. In an electronic device having such a touch panel function, it has been studied to add a touch panel function by separately attaching a touch panel substrate to a display device such as a liquid crystal display device or an organic EL display device.

  In recent years, thin films are formed of various materials on a transparent insulating substrate such as a glass substrate by CVD (Chemical Vapor Deposition) method, etc., and by repeating operations such as cutting and grinding, scanning lines and signal lines can be used. A technique for manufacturing an image reading device by forming a display element, an optical sensor element, or the like is being studied.

  In addition, as a reading method of the image reading apparatus, a so-called conductive sensor electrode is arranged instead of the optical sensor element and so on, and information such as a finger or a pen on the panel surface is detected by a change in capacitance between the electrode and the finger. A technique for detecting a contact position by a capacitance method has been studied.

JP 2006-59034 A

  The display device with a touch panel described in Patent Document 1 is configured by bonding a touch panel in which matrix-like electrodes are formed on the upper surface of the display device. Hereinafter, this method is referred to as an external method. Therefore, in this external method, the thickness of the touch panel is added in addition to the thickness of the display device, so that the display device becomes thicker and an additional glass substrate is required, so that reflection of surface incident light is increased and display quality is improved. Problems such as a decline were pointed out.

  On the other hand, it is possible to reduce the cost of the touch panel by providing at least a part of the touch electrode described above over the substrate constituting the display device. However, even when such a configuration is used, it is desirable to realize good sensing performance that is not inferior to the conventional external method while avoiding an increase in cost due to an increase in processes and members. It is.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a display device with a built-in touch panel function that has high reading performance and can reduce costs.

  One embodiment of the present invention includes an array substrate having a plurality of pixel electrodes or light-emitting elements arranged in a matrix, a counter substrate facing the array substrate and having a black matrix, and a plurality of transparent wires extending in a first direction. A first electrode group, a plurality of transparent second electrode groups extending in a second direction intersecting the first direction, a drive circuit for supplying a drive signal to the first electrode group, and the second electrode A detection circuit that acquires a touch detection signal corresponding to the drive signal from a group, wherein the second electrode group is formed on one layer of the counter substrate, and the first electrode group is formed on the array substrate or the counter substrate. The display device is provided in a single layer, and the touch detection signal is transmitted from the counter substrate side to the array substrate side by capacitive coupling.

It is sectional drawing which shows the structure of the display apparatus examined prior to invention. It is a schematic diagram which shows the structure of a touch panel. It is a figure which shows roughly the circuit structure in connection with the display of a display apparatus. It is a figure which shows the basic composition of the display apparatus which concerns on 1st Embodiment. It is a top view which shows the structure at the time of using the IPS liquid crystal of the display apparatus of 1st Embodiment. FIG. 6 is a cross-sectional view taken along A-A ′ of FIG. 5. It is sectional drawing which follows B-B 'of FIG. It is a top view which shows the structure at the time of using the liquid crystal of the vertical electric field system of the display apparatus of 1st Embodiment. It is sectional drawing which follows A-A 'of FIG. It is sectional drawing which follows B-B 'of FIG. It is sectional drawing which follows C-C 'of FIG. It is a top view which shows the structure at the time of using the liquid crystal of the vertical electric field system of the display apparatus of 1st Embodiment. It is sectional drawing which follows A-A 'of FIG. It is sectional drawing which follows B-B 'of FIG. It is sectional drawing which follows C-C 'of FIG. It is a top view which shows the structure at the time of using OLED of the display apparatus of 1st Embodiment. It is sectional drawing which follows A-A 'of FIG. It is sectional drawing which follows B-B 'of FIG. It is sectional drawing which follows C-C 'of FIG. It is a figure which shows the basic composition of the display apparatus which concerns on 2nd Embodiment. It is a figure which shows the basic composition of the display apparatus which concerns on 3rd Embodiment.

[First Embodiment]
FIG. 1 is a cross-sectional view showing the configuration of a display device studied prior to the invention.
A display device 100 illustrated in FIG. 1 includes a protective cover 2, a touch panel 3, a display unit 4, and a backlight 5. The display unit 4 is, for example, a liquid crystal display panel. The display unit 4 may be formed as a thin display using an OLED (organic light emitting diode). In the case of a self-luminous display such as an OLED, the backlight 5 is not necessary.

  The touch panel 3 includes a touch signal electrode 3a and a touch panel electrode substrate 3b. The touch signal electrode 3a is electrically connected to the touch signal control circuit 11 via the touch connection component 11a. The touch panel 3 detects the approach (contact) position of a dielectric such as a finger based on the capacitance change of the electrode 3a. The touch panel 3 is a transparent electrode using a material such as ITO (Indium Tin Oxide) or silver nanowire, and is disposed on a substrate such as glass or plastic as a large number of vertical and horizontal mosaic electrode patterns.

  The display unit 4 has a structure in which a liquid crystal layer LQ is sandwiched between an array substrate 7 and a counter substrate 8 which are a pair of substrates. Further, polarizing plates PL1 and PL2 are provided on the opposite sides of the array substrate 7 and the counter substrate 8 from the liquid crystal layer, respectively. In the IPS liquid crystal, the transmittance of the liquid crystal layer LQ is controlled by a liquid crystal driving voltage applied to the liquid crystal layer LQ from a pixel electrode PE (not shown) and a common electrode CE (not shown) provided on the array substrate 7. . The pixel electrode PE and the common electrode CE are connected to the display panel control circuit 12 via the display electrode 12a.

  The protective cover 2 protects the touch panel 3 and the display unit 4 against external impacts. The protective cover 2 is made of glass, but may be formed as a transparent dielectric such as acrylic, polycarbonate, or PET.

  Since the display device shown in FIG. 1 is an external system, a dedicated touch panel unit 3 and a touch connection component 11a are necessary.

  Next, circuit configurations and operation principles of the touch panel 3 and the display unit 4 will be described.

  FIG. 2 is a schematic diagram illustrating the configuration of the touch panel 3.

  The touch panel 3 includes a plurality of transparent row electrodes (1 row, 2 rows,...) Extending in the left-right direction and a plurality of transparent column electrodes (A column, B column,...) Extending in the vertical direction.・) Are provided in a grid pattern. The row electrode and the column electrode are disposed in different layers with a transparent insulating film interposed therebetween. For example, the row electrodes can be provided on the touch panel electrode substrate 3b, and the column electrodes can be configured as the touch signal electrodes 3a.

  FIG. 2 shows a state where the finger is in contact with the vicinity of the intersection of the row electrode of the second row of the touch panel 3 and the column electrode of the Ath column. At this time, the mutual capacitance between the row electrode of the second row and the column electrode of the Ath column changes due to the presence of the dielectric finger. Therefore, the position where the finger is present can be detected by measuring the mutual capacitance between the row electrode and the column electrode.

  Note that the self-capacitance of the row electrode of the second row or the self-capacitance of the column electrode of the A-th column changes due to the presence of the dielectric finger. Here, the self-capacitance refers to a capacitance existing between each row electrode or column electrode and a surrounding conductor. Therefore, the position of the finger can also be detected by measuring the change in self-capacitance with the row electrode or the column electrode due to the finger contact.

  The detection operation is executed as follows, for example.

  The touch signal control circuit 11 supplies a signal to the row electrode of the first row and reads the signal of each electrode of the column electrodes (A column, B column,...). The read signal includes information on the mutual capacitance between the row electrode and the column electrode. Next, a signal is supplied to the row electrode of the second row, and the signal of each electrode of the column electrode (column A, column B,...) Is read. By performing this operation by sequentially switching the row electrodes, it is possible to detect the position of the finger (row electrode position and column electrode position). In this operation, the touch signal control circuit 11 outputs an AC waveform signal (for example, a rectangular wave signal), switches the row electrode supplied in synchronization with the AC waveform signal, and switches the column electrodes (A column, B column, ..)) Can be realized by reading the signal of each electrode.

  FIG. 3 is a diagram schematically showing a circuit configuration relating to display of the display device 1. In the following description, the IPS liquid crystal will be described. However, as will be described later, the present application is not limited to the IPS liquid crystal. Can also be widely applied.

  The display device 1 includes a display unit 4, a backlight 5 that illuminates the display unit 4, and a display panel control circuit 12. As described above, the display unit 4 has a structure in which the liquid crystal layer LQ is sandwiched between the array substrate 7 and the counter substrate 8 which are a pair of substrates. The display panel control circuit 12 controls the transmittance of the display unit 4 by controlling the liquid crystal driving voltage applied to the liquid crystal layer LQ.

  In the array substrate 7, a plurality of pixel electrodes PE are arranged in a substantially matrix on the array glass substrate GL. In addition, a plurality of gate lines Y (Y1 to Ym) are arranged along the rows of the plurality of pixel electrodes PE, and a plurality of source lines X (X1 to Xn) are arranged along the columns of the plurality of pixel electrodes PE. . Further, the array substrate 7 is provided with the common electrode CE in a layer different from that of the pixel electrode PE.

  A plurality of pixel switching elements W are arranged in the vicinity of the intersection position of the gate line Y and the source line X. Each pixel switching element W is formed of a thin film transistor in which a gate is connected to the gate line Y and a source-drain path is connected between the source line X and the pixel electrode PE, and corresponds to when driven through the corresponding gate line Y. Conduction is established between the source line X and the corresponding pixel electrode PE.

  Each of the pixel electrodes PE and the common electrode CE is covered with an alignment film, and liquid crystal together with a pixel region that is a part of the liquid crystal layer LQ that is controlled to a liquid crystal molecular arrangement corresponding to the electric field from the pixel electrode PE and the common electrode CE. A pixel PX is configured.

  Each of the plurality of liquid crystal pixels PX has a liquid crystal capacitor CLC between the pixel electrode PE and the common electrode CE. Each of the plurality of auxiliary capacitance lines C1 to Cm constitutes an auxiliary capacitance Cs that is capacitively coupled to the pixel electrode PE of the liquid crystal pixel PX in the corresponding row. The auxiliary capacitor Cs has a sufficiently large capacitance value with respect to the parasitic capacitance of the pixel switching element W.

The display panel control circuit 12 controls operations of the gate driver YD and the source driver XD.
The gate driver YD sequentially drives the plurality of gate lines Y1 to Ym so that the plurality of switching elements W are conducted in units of rows. The source driver XD outputs the pixel voltage Vs to the plurality of source lines X1 to Xn in a period in which the switching elements W in each row are turned on by driving the corresponding gate line Y. The backlight drive unit LD controls the turning on / off operation of the backlight 5.

  On the counter substrate 8, a color filter and a black matrix are arranged corresponding to each pixel. The color filter is a colored layer that transmits R (red), G (green), and B (blue) light corresponding to the sub-pixels. The black matrix is an opaque substance provided at the boundary between the color filters of the respective colors, and prevents light leakage when the display device 1 displays black and mixing of light between adjacent colored layers.

FIG. 4 is a diagram illustrating a basic configuration of the display device 1 according to the first embodiment.
In the display device 1 shown in FIG. 4, the touch signal electrode 3a is provided between the counter substrate 8 and the polarizing plate PL1, and the touch panel electrode substrate 3b is not provided. As will be described later, the function of the touch panel electrode substrate 3b is incorporated in the display unit 4, for example, on the array substrate 7 side. The touch signal electrode 3 a is connected to the electrode on the array substrate 7 side by the capacitive coupling 15. That is, the touch signal is transmitted / received to / from a touch signal control circuit 11 provided outside via the array substrate 7. Since signal exchange with external circuits (touch signal control circuit 11 and display panel control circuit 12) can be performed collectively on the array substrate 7 side, the touch signal line and the display signal line are shared on the array substrate side. It becomes possible to do.

  As described above, according to the first embodiment, the touch panel electrode substrate 3b is not provided, and the touch signal is exchanged by capacitive coupling between the touch signal electrode 3a on the counter substrate 8 side and the electrode on the array substrate 7 side. Since the connection to the external circuit can be performed via the connection component for display, the thickness can be reduced and the cost can be reduced.

  Next, a configuration for realizing the touch function in the display device 1 according to the first embodiment will be described. In the following description, it should be noted that the reference numerals may be changed as appropriate and may be different from the above description.

[Configuration using horizontal electric field type liquid crystal]
FIG. 5 is a plan view showing a configuration when the IPS liquid crystal of the display device according to the first embodiment is used.

  The array substrate 7 is provided with a touch row electrode 20a, a touch signal driver 21, a shared electrode 14, an array side capacitor electrode 25a, and a connection line 26. The counter substrate 8 includes a touch column electrode 20b and a counter capacitor electrode 25b.

  The touch row electrode 20a corresponds to the row electrode (1 row, 2 rows,...) Shown in FIG. The touch signal driver 21 outputs an AC waveform signal (for example, a rectangular wave signal) to the touch row electrode 20a. In the touch column electrode 20b, a signal (touch signal) corresponding to the mutual capacitance between the touch column electrode 20a and the self capacitance of the touch column electrode 20b is generated. The counter-side capacitor electrode 25b is capacitively coupled to the array-side capacitor electrode 25a. The generated signal is sent to the shared electrode 14 via the array-side capacitive electrode 25a. The common electrode 14 is electrically connected to the touch signal driver 21 and the array-side capacitor electrode 25a by a connection line 26.

  FIG. 6 is a cross-sectional view taken along A-A ′ in FIG. 5. The liquid crystal layer LQ is sandwiched between the array substrate 7 and the counter substrate 8.

  The array substrate 7 has a common electrode CE disposed on the array glass substrate via an organic insulating film (HRC). The common electrode CE is covered with an interlayer insulating film such as a SiN film, and the pixel electrode PE is disposed on the interlayer insulating film. An alignment film is provided on the surface of the array substrate 7 on the side in contact with the liquid crystal layer LQ. The counter substrate 8 includes a black matrix (BM) layer and a color filter (CF) layer on a counter glass substrate, and further provides an alignment film on the surface in contact with the liquid crystal layer LQ.

  The touch row electrode 20a is shared with the common electrode CE of the array substrate 7, and the touch column electrode 20b is provided on the surface of the counter substrate 8 opposite to the liquid crystal layer LQ of the counter glass substrate.

  FIG. 7 is a cross-sectional view taken along B-B ′ in FIG. 5. Since the configurations of the array substrate 7 and the counter substrate 8 have already been described, redundant description will be omitted.

  The array-side capacitor electrode 25a can be formed in the same process as the transparent electrode that forms the pixel electrode PE and the like on the interlayer insulating film such as the SiN film by using a transparent electrode. The connection line 26 is provided on the array glass substrate. The array-side capacitor electrode 25a and the connection line 26 can be formed in the same process as the transparent electrode forming the array-side capacitor electrode 25a by being electrically connected by a transparent contact electrode 25c. The counter-side capacitor electrode 25b can be formed in the same process as the touch column electrode 20b by using a transparent electrode.

  As shown in FIGS. 5 to 7, since the touch row electrode 20 a is shared with the common electrode CE of the array substrate 7, the touch panel electrode substrate 3 b becomes unnecessary, and thus the thickness of the display device 1 can be reduced. . Further, by capacitively coupling the capacitor electrode 25b provided on the counter substrate side and the capacitor electrode 25a provided on the frame on the array substrate side, the touch signal can be taken out to the electrode on the array substrate. Further, by sharing the display operation and the touch operation, it is possible to share the display electrode signal, and it is possible to reduce costs such as component reduction.

  In FIG. 6, the touch column electrode 20b is provided on the surface of the counter glass substrate opposite to the liquid crystal layer LQ of the counter substrate 8, but is further provided on the surface of the polarizing plate PL1 opposite to the liquid crystal layer LQ. Also good. Alternatively, the counter substrate 8 may be provided on the surface of the counter glass substrate on the liquid crystal layer LQ side. However, when the influence on the display operation is taken into consideration, it is desirable to provide the counter glass substrate on the surface opposite to the liquid crystal layer LQ.

[Configuration using vertical electric field type liquid crystal-1]
FIG. 8 is a plan view showing a configuration when the vertical electric field type liquid crystal of the display device of the first embodiment is used. In a display device using a vertical electric field type liquid crystal, the common electrode CE is provided on the counter substrate 8 side. For this reason, the touch row electrode 20a is also provided on the counter substrate 8 side.

  The array substrate 7 is provided with a touch signal driver 21, a shared electrode 14, an array side capacitor electrode 25 a, a connection line 26, and an array side connection pad 31. The counter substrate 8 includes a touch row electrode 20a, a touch column electrode 20b, and a counter-side capacitance electrode 25b.

  Since the touch row electrode 20a is provided on the counter substrate 8, an array side connection pad 31 for electrically connecting the electrode on the array substrate 7 side and the touch row electrode 20a is newly provided. Since the arrangement of components other than the touch row electrodes 20a and the array side connection pads 31 is the same as described above, the description thereof is omitted.

  FIG. 9 is a cross-sectional view taken along A-A ′ of FIG. 8. The liquid crystal layer LQ is sandwiched between the array substrate 7 and the counter substrate 8.

  The array substrate 7 has an auxiliary capacitance electrode CsE disposed on the array glass substrate via an organic insulating film (HRC). The auxiliary capacitance electrode CsE is covered with an interlayer insulating film such as SiN, and the pixel electrode PE is disposed on the interlayer insulating film. An alignment film is provided on the surface of the array substrate 7 on the side in contact with the liquid crystal layer LQ. The counter substrate 8 includes a black matrix (BM) layer and a color filter (CF) layer on a counter glass substrate, and further has a common electrode CE on the surface in contact with the liquid crystal layer LQ. An alignment film is provided so as to cover the black matrix (BM) layer, the color filter (CF), and the touch row electrode 20a.

  The touch row electrode 20a is shared with the common electrode CE of the counter substrate 8, and the touch column electrode 20b is provided on the surface of the counter glass substrate opposite to the liquid crystal layer LQ of the counter substrate 8.

  FIG. 10 is a sectional view taken along B-B ′ of FIG. 8. 10 has the same configuration as the cross-sectional view shown in FIG.

  FIG. 11 is a cross-sectional view taken along C-C ′ in FIG. 8. An array side connection pad 31 is provided at the output terminal of the touch signal driver 21. The touch row electrode 20a (common electrode CE) provided on the counter substrate 8 side is electrically connected to the array side connection pad 31 via, for example, an Au-plated pearl material 30 that is conductive fine particles. Thereby, the touch signal driver 21 can supply an AC waveform signal to the touch row electrode 20a.

[Configuration using vertical electric field type liquid crystal-2]
FIG. 12 is a plan view showing a configuration when the vertical electric field type liquid crystal of the display device of the first embodiment is used. In a display device using a vertical electric field type liquid crystal, the common electrode CE is provided on the counter substrate 8 side. For this reason, the touch row electrode 20a is also provided on the counter substrate 8 side.

  The array substrate 7 is provided with a common electrode 14, an array side capacitor electrode 25 a, a connection line 26, and an array side connection pad 31. The counter substrate 8 includes a touch row electrode 20a, a touch column electrode 20b, a counter-side capacitor electrode 25b, and a wiring 27.

  Since the wiring 27 is provided on the counter substrate 8, an array-side connection pad 31 for electrically connecting the electrode on the array substrate 7 side and the wiring 27 is newly provided. The array substrate 7 is not provided with the touch signal driver 21. Since the planar arrangement of the components other than the touch row electrode 20a, the array side connection pad 31, and the wiring 27 is the same as described above, the description thereof is omitted.

  FIG. 13 is a cross-sectional view taken along A-A ′ of FIG. 12. The liquid crystal layer LQ is sandwiched between the array substrate 7 and the counter substrate 8.

  The array substrate 7 has an auxiliary capacitance electrode CsE disposed on the array glass substrate via an organic insulating film (HRC). The auxiliary capacitance electrode CsE is covered with an interlayer insulating film such as SiN, and the pixel electrode PE is disposed on the interlayer insulating film. An alignment film is provided on the surface of the array substrate 7 on the side in contact with the liquid crystal layer LQ. The counter substrate 8 includes a black matrix (BM) layer and a color filter (CF) layer on a counter glass substrate. The touch row electrode 20a and the black matrix layer are provided at the same position in the plan view. An alignment film is provided so as to cover the black matrix (BM) layer, the color filter (CF), and the touch row electrode 20a. The touch row electrode 20a may be configured to be shared with the black matrix layer.

  The touch column electrode 20b is provided on the surface of the counter glass 8 opposite to the liquid crystal layer LQ of the counter glass substrate.

  FIG. 14 is a cross-sectional view taken along B-B ′ in FIG. 12. FIG. 14 has the same configuration as the cross-sectional view shown in FIG.

  FIG. 15 is a cross-sectional view taken along C-C ′ in FIG. 12. The array substrate 7 is provided with array-side connection pads 31 connected to an external control circuit. The wiring 27 provided on the counter substrate 8 side is electrically connected to the array-side connection pad 31 via the Au-plated pearl material 30 which is conductive fine particles. The wiring 27 and the touch row electrode 20a are connected.

  In the configuration (No. 2) using the vertical electric field type liquid crystal shown in FIGS. 12 to 15, the signal is directly supplied from the outside without including the touch signal driver 21. Therefore, compared with the configuration using the vertical electric field type liquid crystal shown in FIGS. 8 to 11 (No. 1), it is not necessary to arrange the driver circuit and the array side connection pads at the same place, so the frame width is reduced. It becomes possible to do.

  In the configuration (No. 2), the touch row electrode 20a is not a transparent electrode but an opaque metal electrode, and is formed so as to be used as a BM or not to protrude from the BM separately from the common electrode CE. When the conventional transparent electrode is used for the touch row electrode 20a, the wiring resistance of the frame routing portion is high, but the resistance of the metal electrode is lower than that of the transparent electrode. Can be formed.

  As shown in FIGS. 12 to 15, the touch row electrode 20 a is formed of an opaque metal electrode and is formed so as to be used as a BM or not to protrude from the BM separately from the common electrode CE. Since it becomes unnecessary, the thickness of the display device 1 can be reduced. In addition, the touch signal can be taken out to the electrode on the array substrate by capacitively coupling the electrode provided on the counter substrate side and the electrode provided on the frame on the array substrate side. In addition, it is possible to reduce the frame width by forming the wiring around the frame portion in a fine and compact pattern. Further, by sharing the display operation and the touch operation, it is possible to share the display electrode signal and the touch signal, and it is possible to reduce costs such as component reduction.

  In FIG. 13, the touch column electrode 20b is provided on the surface of the counter glass 8 opposite to the liquid crystal layer LQ of the counter glass substrate, but is further provided on the surface of the polarizing plate PL1 opposite to the liquid crystal layer LQ. Also good. Alternatively, the counter substrate 8 may be provided on the surface of the counter glass substrate on the liquid crystal layer LQ side. However, when the influence on the display operation is taken into consideration, it is desirable to provide the counter glass substrate on the surface opposite to the liquid crystal layer LQ.

[Configuration using organic light emitting diode (OLED)]
FIG. 16 is a plan view showing a configuration when the OLED of the display device according to the first embodiment is used. In a display device using OLED, there is no common electrode CE used for liquid crystal.

  The array substrate 7 is provided with a common electrode 14, an array side capacitor electrode 25 a, a connection line 26, a wiring 27, and an array side connection pad 31. The counter substrate 8 includes a touch row electrode 20a, a touch column electrode 20b, and a counter side capacitor electrode 25b.

  Since the wiring 27 is provided on the counter substrate 8, an array-side connection pad 31 for electrically connecting the electrode on the array substrate 7 side and the wiring 27 is newly provided. The array substrate 7 is not provided with the touch signal driver 21. Since the planar arrangement of the components other than the touch row electrode 20a, the array side connection pad 31, and the wiring 27 is the same as described above, the description thereof is omitted.

  FIG. 17 is a cross-sectional view taken along A-A ′ of FIG. 16. The array substrate 7 and the counter substrate 8 sandwich a filler layer.

  The array substrate 7 is provided with a barrier layer in which an OLED and an OLED drive circuit 35 are arranged on an array glass substrate. The OLED is configured by sandwiching a light emitting layer between an OLED cathode and an OLED anode.

The counter substrate 8 includes a black matrix (BM) layer and a color filter (CF) layer on a counter glass substrate. The touch row electrodes 20a and the black matrix layer are provided at the same position in the plan view. The touch row electrode 20a may be configured to be shared with the black matrix layer.

  The touch column electrode 20b is provided on the surface of the counter substrate 8 opposite to the filler layer of the counter glass substrate.

  18 is a cross-sectional view taken along B-B ′ of FIG.

  The array-side capacitor electrode 25a is a transparent electrode and is provided on the barrier layer. The connection line 26 is provided on the array glass substrate. The array-side capacitor electrode 25a and the connection line 26 are electrically connected by a transparent contact electrode 25c. The counter-side capacitance electrode 25b is a transparent electrode and is formed in the same layer as the touch column electrode 20b.

  In FIG. 18, the contact electrode 25c penetrating the barrier layer is provided. However, when a through hole is provided in the barrier layer, a wet process is used, so that it is not necessarily a manufacturing method suitable for OLED. Therefore, as a variation, the array-side capacitor electrode 25a may be extended to the outside of the barrier layer and electrically connected to the connection line 26 outside.

  FIG. 19 is a cross-sectional view taken along C-C ′ in FIG. 16.

  The array substrate 7 is provided with array-side connection pads 31 connected to an external control circuit. The wiring 27 provided on the counter substrate 8 side is electrically connected to the array-side connection pad 31 via the Au-plated pearl material 30 which is conductive fine particles. The wiring 27 and the touch row electrode 20a are electrically connected.

  In the configuration using the OLED shown in FIGS. 16 to 19, the touch row electrode 20 a is not a transparent electrode but an opaque metal electrode, and is formed so as to be used as a BM or not protrude from the BM. When a conventional transparent electrode is used as the touch row electrode 20a, there is a problem that the wiring resistance of the frame routing portion is high. However, since the resistance of the metal electrode is lower than that of the transparent electrode, the wiring routing of the frame portion is low. Can be formed in a fine and compact pattern.

  As shown in FIGS. 16 to 19, the touch row electrode 20 a is formed of an opaque metal electrode and is formed so as to be used as a BM or not to protrude from the BM, thereby eliminating the need for the touch panel electrode substrate 3 b. 1 can be reduced in thickness. In addition, the touch signal can be taken out to the electrode on the array substrate by capacitively coupling the electrode provided on the counter substrate side and the electrode provided on the frame on the array substrate side. In addition, it is possible to reduce the frame width by forming the wiring around the frame portion in a fine and compact pattern. Further, by sharing the display operation and the touch operation, it is possible to share the display electrode signal, and it is possible to reduce costs such as component reduction.

[Second Embodiment]
FIG. 20 is a diagram illustrating a basic configuration of the display device 1 according to the second embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the second embodiment, an amplifier circuit (AMP) 40 is provided on the array substrate so as to convert it into an amplified signal. As a result, the external circuit configuration is simplified, and the touch performance can be improved and the cost of the external circuit can be reduced.

[Third embodiment]
FIG. 21 is a diagram illustrating a basic configuration of the display device 1 according to the third embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the third embodiment, an amplification conversion circuit (AMP + ADC) 41 is provided on the array substrate, and a signal is amplified and converted into a digital signal (A / D conversion) for output. Thereby, the external circuit configuration is simplified, and the touch performance can be improved and the touch signal control circuit 11 can be further simplified.

  The several embodiments described above have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  For example, in the above-described embodiment, the touch row electrode 20a is shared with the auxiliary capacitance electrode CsE, the common electrode CE, and the BM25. However, the touch row electrode 20a is configured to be shared with the gate line Y and the source line X. Also good.

  Further, an AC waveform signal is input to the touch row electrode 20a and a touch signal is read from the touch column electrode 20b. Conversely, an AC waveform signal is input to the touch column electrode 20b and a touch signal is read from the touch row electrode 20a. Also good.

  Further, a self-capacitance method may be adopted so that an AC waveform signal is input to a part of the touch column electrode 20b, and the touch position is detected by reading the signal from the remaining touch column electrode 20b.

  Further, the counter substrate 8 may include a polarizing plate, and the touch column electrode 20b may be provided on the upper surface of the polarizing plate.

  The driving element on the array substrate 7 can be composed of a low-temperature polysilicon TFT. As a result, the frame can be used widely and the opening can be enlarged.

  The driving element on the array substrate 7 can be composed of an oxide TFT. This can further reduce the cost.

  Further, the driving element on the array substrate 7 can be composed of an organic thin film TFT. Thereby, a flexible display part can be formed.

  LQ ... liquid crystal layer, PE ... pixel electrode, CE ... common electrode, GL ... array glass substrate, Y ... gate line, X ... source line, C1-Cm ... auxiliary capacitance line, CsE ... auxiliary capacitance electrode, PL1, PL2 ... polarized light Plate: 1 Display device 3 Touch panel 3a Touch signal electrode 3b Touch panel electrode substrate 4 Display unit 5 Backlight 7 Array substrate 8 Counter substrate 11a Touch connection component 11 ... Touch signal control circuit, 12a ... Display electrode, 12 ... Display panel control circuit, 14 ... Common electrode, 20a ... Touch row electrode, 20b ... Touch column electrode, 21 ... Touch signal driver, 25a ... Capacitance electrode on the array side 25b: Opposite side capacitance electrode, 25c: Contact electrode, 26 ... Connection line, 27 ... Wiring, 30 ... Pearl material, 31 ... Array side connection pad, 35 ... OLED drive Road, 40 ... amplifier, 41 ... amplifier converter circuit.

Claims (9)

An array substrate having a plurality of pixel electrodes or light emitting elements arranged in a matrix;
A counter substrate facing the array substrate and having a black matrix;
A plurality of transparent first electrode groups extending in a first direction;
A plurality of transparent second electrode groups extending in a second direction intersecting the first direction;
A drive circuit for supplying a drive signal to the first electrode group;
A detection circuit that acquires a touch detection signal corresponding to the drive signal from the second electrode group,
The second electrode group is formed on one layer of the counter substrate,
The first electrode group is formed on one layer of the array substrate or the counter substrate,
The display device, wherein the touch detection signal is transmitted from the counter substrate side to the array substrate side by capacitive coupling. The display device sandwiches a horizontal electric field type liquid crystal layer between the array substrate and a counter substrate,
The first electrode group is shared with the common electrode of the array substrate,
The second electrode group is formed on the back side of the insulating substrate of the counter substrate.
The display device according to claim 1. The display device sandwiches a vertical electric field type liquid crystal layer between the array substrate and a counter substrate,
The first electrode group is shared with the common electrode of the counter substrate,
The second electrode group is formed on the back side of the insulating substrate of the counter substrate.
The display device according to claim 1. The drive circuit is provided on the frame of the array substrate,
The drive circuit and the first electrode group are electrically connected via conductive fine particles,
The display device according to claim 3. The display device sandwiches a vertical electric field type liquid crystal layer between the array substrate and a counter substrate,
The first electrode group is shared with the black matrix of the counter substrate, or is shared with a common electrode in a region of the black matrix of the counter substrate in a plan view,
The second electrode group is formed on the back side of the insulating substrate of the counter substrate.
The display device according to claim 1. The display device sandwiches a filler between the array substrate including a light emitting element and a counter substrate,
The first electrode group is shared with the black matrix of the counter substrate, or formed in a region of the black matrix of the counter substrate in a plan view,
The second electrode group is formed on the back side of the insulating substrate of the counter substrate.
The display device according to claim 1. The frame of the array substrate is provided with a signal terminal from the drive circuit outside the array substrate,
The signal terminal and the first electrode group are electrically connected via conductive fine particles,
The display device according to claim 5 or 6.   The analog amplifier circuit according to claim 1, further comprising an analog amplifier circuit that amplifies a touch detection signal transmitted to the array substrate side by the capacitive coupling and outputs the amplified signal to the detection circuit outside the array substrate. The display device according to item. An analog amplification circuit that amplifies a touch detection signal transmitted to the array substrate side by the capacitive coupling;
The display device according to claim 1, further comprising a digital conversion circuit that digitizes the amplified touch detection signal and outputs the digitized touch detection signal to the detection circuit outside the array substrate.

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