CN106126000A - display device - Google Patents

Abstract

The invention discloses a display device, which includes a first substrate, a second substrate and a plurality of first conductive bumps therebetween. The first substrate has a first conductive layer, and the first conductive layer includes a plurality of independent first electrodes; the second substrate is opposite to the first substrate, and the second substrate has a touch detection chip and a plurality of independent second electrodes. Electrodes, a plurality of first conductive bumps correspond to a plurality of second electrodes one by one, the projection of the first electrode on the second substrate corresponds to at least one second electrode, and each first conductive bump is electrically connected to the corresponding first electrode. The electrodes and the second electrodes, the plurality of second electrodes are electrically connected to the touch detection chip, the touch detection chip is used to load the common electrode signal to the plurality of second electrodes during the display period, and detect the plurality of second electrodes during the touch period. The capacitance value of the first electrode is changed to determine the touch position. The display device of the present invention has a new touch function in addition to the display function.

Description

display device

technical field

The invention relates to a display device, in particular to a display device with a touch function.

Background technique

With the rapid development of display technology, touch screen panels (Touch Screen Panels) have gradually spread in people's lives. According to the composition and structure, touch screens can be divided into: external touch screens, surface-covering touch screens and built-in touch screens. Among them, the embedded touch screen embeds the touch electrodes of the touch screen inside the liquid crystal display, which can reduce the overall thickness of the module and greatly reduce the production cost of the touch screen, and is favored by major panel manufacturers. In order to make the production of the embedded touch screen more convenient, the manufacturer multiplexes the common electrode layer on the array substrate of the Advanced Hyper-Viewing Angle (AHVA) display screen as a self-capacitance electrode layer to realize the touch screen. For some display screens, because the common electrode layer is provided on the color filter substrate, such as the Twisted Nematic (TN) display screen, it is impossible to follow the method of making a touch screen with the AHVA display screen.

Contents of the invention

The purpose of the present invention is to provide a general display device with touch function.

In order to achieve the above object, the present invention proposes a display device comprising: a first substrate, a plurality of first conductive bumps and a second substrate. The first substrate has a first conductive layer, and the first conductive layer includes a plurality of first electrodes independent of each other; a plurality of first conductive bumps are arranged between the first substrate and the second substrate; the second substrate and the second substrate The first substrate is oppositely arranged, and the second substrate has a touch detection chip and a plurality of independent second electrodes, and the plurality of first conductive bumps correspond to the plurality of second electrodes one by one, and the first electrodes are in a one-to-one correspondence with the plurality of second electrodes. The projection on the second substrate corresponds to at least one second electrode, each first conductive bump is electrically connected to the corresponding first electrode and the second electrode, and the plurality of second electrodes are electrically connected to the touch detection Chip, the touch detection chip is used to load the common electrode signal to the plurality of second electrodes during the display period, and determine the touch position by detecting the capacitance value change of the plurality of first electrodes during the touch period.

As an optional technical solution, the first substrate further includes a second conductive layer, the second conductive layer is disposed between the first conductive layer and the first substrate, and the second conductive layer and the first conductive layer Insulated from each other, the second conductive layer shields the gaps between the plurality of first electrodes.

As an optional technical solution, the second conductive layer includes a plurality of independent third electrodes, and the second substrate also has a plurality of independent fourth electrodes, and there is a gap between the first substrate and the second substrate. A plurality of second conductive bumps are provided, the plurality of second conductive bumps correspond to the plurality of fourth electrodes one by one, the projection of the third electrode on the second substrate corresponds to at least one fourth electrode, each A second conductive bump is electrically connected to the corresponding third electrode and the fourth electrode.

As an optional technical solution, there is a first insulating layer between the second conductive layer and the first conductive layer, and the second conductive bump and the third electrode pass through the first through hole on the first insulating layer electrical connection.

As an optional technical solution, the first conductive layer and the second conductive layer have the same potential during the display period; or the first conductive layer and the second conductive layer are short-circuited during the display period.

As an optional technical solution, a plurality of transmission wires are further arranged on the second substrate, the plurality of transmission wires are electrically connected to the touch detection chip, and each transmission wire is electrically connected to at least one second electrode.

As an optional technical solution, a first switch is further arranged on the second substrate, one end of the first switch is electrically connected to the transmission wire, and the other end of the first switch is electrically connected to the second electrode, and the first switch is connected to the second electrode. The touch time period is selectively turned on.

As an optional technical solution, a plurality of second common electrodes of the same layer but not connected are also arranged on the second substrate, and the plurality of second electrodes are electrically connected to the touch detection device through the plurality of second common electrodes. chip.

As an optional technical solution, gate lines are further arranged on the second substrate, and the extension direction of the plurality of second common electrodes is parallel to the gate lines.

As an optional technical solution, the first conductive bump includes a spacer and a conductive layer, and the conductive layer covers the spacer.

In the display device of the present invention, the conductive layer on the first substrate is divided into a plurality of independent first electrodes, and at the same time, a plurality of first conductive bumps arranged between the first substrate and the second substrate and a plurality of first conductive bumps arranged on the second substrate are arranged together. The plurality of second electrodes on the second substrate realizes the electrical connection between the first electrodes and the touch detection chip, so that the display device of the present invention has a new touch function in addition to the original display function.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

1 is a partial cross-sectional view of a first embodiment of a display device of the present invention;

Fig. 2 is a partial bottom view of the first substrate in Fig. 1;

3A is a partial top view of a second substrate of the display device of the present invention;

Figure 3B is a partially enlarged view of Figure 3A;

4A is a partial top view of another embodiment of the second substrate of the display device of the present invention;

Figure 4B is a partially enlarged view of Figure 4A;

5 is a partial cross-sectional view of a second embodiment of the display device of the present invention;

FIG. 6 is a partial cross-sectional view of a third embodiment of the display device of the present invention.

detailed description

The following descriptions of the various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention can be practiced. The directional terms mentioned in the present invention, such as "upper", "lower", "front", "rear", "left", "right", "side", etc., are only referring to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present invention, but not to limit the present invention.

In the following embodiments, the same parts are denoted by the same symbols in different drawings.

Please refer to FIG. 1 and FIG. 2 , FIG. 1 is a partial cross-sectional view of the display device of the present invention, and FIG. 2 is a partial bottom view of the first substrate of the display device of the present invention. The display device includes a first substrate 100, a second substrate 200, and a plurality of first conductive bumps 300. The first substrate 100 is arranged opposite to the second substrate 200, and the plurality of first conductive bumps 300 are arranged on the first substrate 100 and the second substrate 200. between the two substrates 200 . The first substrate 100 has a first conductive layer 110, and the first conductive layer 110 includes a plurality of first electrodes 111 that are independent from each other. The second substrate 200 has a touch detection chip 250 (see FIG. 4 ) and a plurality of independent second electrodes 210. The plurality of first conductive bumps 300 correspond to the plurality of second electrodes 210 one by one. The first electrodes 111 The projection on the second substrate 200 corresponds to at least one second electrode, and each first conductive bump 300 is electrically connected to the corresponding first electrode 111 and the second electrode 210 . The plurality of second electrodes 210 are connected to the touch detection chip 250 . The touch detection chip 250 is used to load the common electrode signal to the plurality of second electrodes 210 during the display time period, and determine the touch position by detecting the capacitance value change of the plurality of first electrodes 111 during the touch time period. In actual operation, the second substrate 200 has a display area (not shown) and a peripheral area (not shown), the peripheral area surrounds the display area, a plurality of second electrodes 210 are arranged in the display area, and the touch detection chip 250 can be arranged in the peripheral area.

In the display device of the present invention, during the display time period, the touch detection chip 250 loads a common electrode signal to the plurality of second electrodes 210. Since the second electrodes 210 are electrically connected to the first electrodes 111 through the first conductive bumps 300, Finally, the common electrode signal is transmitted to the plurality of first electrodes 111 on the first substrate 100 . Therefore, during the display period, the first conductive layer 110 including the plurality of first electrodes 111 can be used as a common electrode layer. During the touch time period, a plurality of first electrodes 111 are used as self-capacitance electrodes. When the human body touches the display device, the capacitance value of a certain first electrode 111 changes. The block 300 is electrically connected to the touch detection chip 250 , so the touch detection chip 250 can determine the touch position by detecting the capacitance value change of each first electrode 111 .

In this embodiment, the first substrate 100 is a color filter substrate, on which a color filter layer 160 is disposed, and a first insulating layer 150 is disposed between the color filter layer 160 and the first conductive layer 110 . The second substrate 200 is an array substrate. For convenience of illustration, only a plurality of first electrodes 111 and the first insulating layer 150 are shown in FIG. 2 . The present invention is preferably applicable to a twisted nematic (Twisted Nematic, TN) liquid crystal display. In general TN-type liquid crystal displays, the color filter substrate is provided with a whole layer of transparent conductive layer as a common electrode layer, and the present invention divides the whole layer of common electrode layer into a plurality of first electrodes that are independent of each other. A plurality of first conductive bumps between the first substrate and the second substrate and a plurality of second electrodes disposed on the second substrate realize the electrical connection between the first electrodes and the touch detection chip 250, In addition to the original display function, the display device of the present invention adds a touch function.

In actual operation, since the display device of the present invention needs to multiplex the first conductive layer 110 in time division, it is necessary to adopt a time-division driving method for the display period and the touch period. In addition, the display driver chip and the above-mentioned touch detection chip 250 can be integrated into one chip to further reduce the production cost and improve the production efficiency.

How to realize the electrical connection between the second electrode 210 and the touch detection chip 250 will be described in detail below. Generally speaking, the density of the display device is usually on the order of millimeters. Users can set the density and area of the first electrodes 111 according to actual needs to ensure the required touch density. For example, the first electrodes 111 are designed to be about 5mm*5mm. square electrodes. The density of a display device is usually on the order of microns, therefore, one first electrode 111 corresponds to a plurality of pixel units in the display device, that is, when the first substrate 100 and the second substrate 200 are aligned, one first electrode 111 A vertical projection range on the second substrate 200 includes a plurality of pixel units. Please refer to FIG. 2 , FIG. 3A and FIG. 3B at the same time. FIG. 3A is a partial top view of the second substrate of the display device of the present invention, and FIG. 3B is a partial enlarged view of FIG. 3A . For convenience of illustration, FIG. 2 only shows six first electrodes 111 , which are marked as TP1 - TP6 respectively. A plurality of pixel units 213 are correspondingly shown in FIG. 3, and the plurality of pixel units 213 are divided into 6 pixel groups, respectively marked as PX1-PX6. When the first substrate 100 and the second substrate 200 are paired, FIG. 2 The vertical projection range of the first electrode 111 marked as TP1 on the second substrate 200 corresponds to the pixel group marked as PX1 in FIG. 3A , and the vertical projection range of the first electrode 111 marked as TP2 on the second substrate 200 in FIG. 2 Corresponds to the pixel group marked as PX2 in FIG. 3A , and so on.

As shown in FIG. 3A, a plurality of data lines 211 and a plurality of gate lines 212 are arranged on the second substrate 200. The data lines 211 and the gate lines 212 are not parallel. Preferably, the two are perpendicular to each other, and two adjacent data lines A pixel unit 213 is formed by an area enclosed by a line 211 intersecting with two adjacent gate lines 212 . As shown in FIG. 3A and FIG. 3B , a plurality of transmission wires 220 are disposed on the second substrate 200 , the transmission wires 220 are electrically connected to the touch detection chip 250 , and each transmission wire 220 is electrically connected to at least one second electrode 210 . In this embodiment, the transmission wire 220 is arranged adjacent to the data line 211, and the transmission wire 220 is parallel to the data line 211. When actually manufacturing the second substrate 200, the transmission wire 220 and the data line 211 can be formed in the same mask process.

In this embodiment, the transmission wires 220 are uniformly arranged on the second substrate 200 , and each pixel group includes 6 (3*2) pixel units 213 , so every third data line 211 is provided with a transmission wire 220 . As shown in FIG. 3B , the second substrate 200 is also provided with a first switch 221, one end of the first switch 221 is electrically connected to the transmission wire 220, and the other end of the first switch 221 is electrically connected to the second electrode 210, and the first switch 221 is connected to the second electrode 210. The touch time period is selectively turned on. In this embodiment, the first switch 221 is a thin film transistor, and the first switch 221 and the second electrode 210 are arranged in different layers, so the first switch 221 is electrically connected to the second electrode 210 through the first via hole 222 . In addition, in this embodiment, although the first switch 221 and the second electrode 210 are both arranged in the region of the pixel unit 213, only one first switch 221 and the second electrode 210 are arranged for every 6 pixel units, so the pixel unit 213 has less impact. It should be noted that, in this embodiment, each pixel group includes 6 pixel units. In actual operation, the user can determine the number of pixel units included in each pixel group according to the actual process level and touch density requirements.

In the present invention, since each transmission wire 220 is electrically connected to at least one second electrode 210, and a first switch 221 is arranged between the second electrode 210 and the transmission wire 220, if the first switch 221 connected to the same transmission wire 220 Turning on at the same time will cause a short circuit, affect the use of the display device, and even cause damage to the components. Therefore, the first switches 221 connected to the same transmission wire 220 cannot be turned on at the same time, but only one of them can be turned on. For example, during the touch time period, the first switch 221 in the first pixel group PX1 is turned on, so that the driving signal of the touch detection chip 250 can be transmitted to the second electrode 210, and then transmitted to the second electrode 210 through the first conductive bump 300. first electrode 111 , while the first switches 221 in the remaining pixel groups are turned off; then, the first switches 221 in the second pixel group PX2 are turned on, while the first switches 221 in the remaining pixel groups are turned off, and so on. In the present invention, the turn-on sequence of the first switch 221 in the touch time period is similar to the scan driving sequence in the display time period. Of course, the user may also adopt other driving methods, for example, the first switches 221 connected to different transmission wires 220 are turned on at the same time, which is not limited to the above. In actual operation, the number of transmission wires 220 can also be increased, so that each transmission wire 220 is electrically connected to a first switch 221, so that the opening and closing of each first switch 221 can be set arbitrarily without considering other The state of the first switch 221 will cause more transmission wires 220 on the second substrate 200, which will affect the production cost and aperture ratio.

Please refer to FIG. 2 and FIG. 4 at the same time. FIG. 4 is a partial top view of another embodiment of the second substrate of the display device of the present invention. For the convenience of description, only the plurality of pixel units shown in FIG. 4 are divided into 4 pixel groups, respectively marked as PX1, PX2, PX4 and PX5. The vertical projection range of the first electrode 111 marked as TP1 on the second substrate 200 corresponds to the pixel group marked as PX1 in FIG. 4 , and the vertical projection of the first electrode 111 marked as TP2 on the second substrate 200 in FIG. 2 The range corresponds to the pixel group labeled PX2 in Figure 4, and so on. As shown in FIG. 4 , a plurality of second common electrodes 230 of the same layer but not connected are also arranged on the second substrate 200, and the plurality of second electrodes 210 on the second substrate 200 are connected by the plurality of second common electrodes 230. It is electrically connected to the touch detection chip 250 . As shown in FIG. 4, the second common electrode 230 is located between two adjacent gate lines 212, and the extension direction of the second common electrode 230 is parallel to the gate lines 212. The second common electrode 230 and the gate line 212 are formed in the mask process.

In this embodiment, the second electrodes 210 and the second common electrodes 230 are arranged in different layers, so each second common electrode 230 is electrically connected to the corresponding second electrode 210 through the second via hole 223 . In this embodiment, each pixel group includes 12 (6*2) pixel units, and the second common electrode 230 is electrically connected to six of the second electrodes 210, because the second electrodes 210 connected to the second common electrode 230 A large number can effectively reduce impedance and reduce signal attenuation. In actual operation, the user can select the number of the second electrodes 210 connected to the second common electrode 230 by himself, which is not limited to the above. As shown in FIG. 4, a plurality of peripheral traces are also provided on the second substrate 200. For convenience of illustration, only four second common electrodes 230 and four peripheral traces are shown in FIG. 230 are marked as 230-1, 230-2, 230-3 and 230-4 respectively, and the four peripheral traces are marked as 240-1, 240-2, 240-3 and 240-4 respectively. The second common electrodes 230-1 to 230-4 are respectively connected to the touch detection chip 250 through peripheral wires 240-1 to 240-4. During the touch time period, the capacitance value of the first electrode 111 marked as TP1 is transmitted to the second common electrode 230-2 through the first conductive bump 300 and the second electrode 210, and then transmitted through the peripheral wiring 240-2. To the touch detection chip 250; the capacitance value of the first electrode 111 marked as TP2 is transmitted to the second common electrode 230-1 through the first conductive bump 300 and the second electrode 210, and then through the peripheral wiring 240- 1 is transmitted to the touch detection chip 250; the capacitance value of the first electrode 111 marked as TP4 is transmitted to the second common electrode 230-4 through the first conductive bump 300 and the second electrode 210, and then through the peripheral wiring 240-4 is transmitted to the touch detection chip 250; the capacitance value of the first electrode 111 marked as TP5 is transmitted to the second common electrode 230-3 through the first conductive bump 300 and the second electrode 210, and then through the peripheral The wire 240 - 3 is passed to the touch detection chip 250 . When the user touches the display device, the touch detection chip 250 can determine the touch position according to the change of the capacitance value of each first electrode 111 .

Please refer to FIG. 5 , which is a partial cross-sectional view of a second embodiment of the display device of the present invention. Different from the first embodiment, in this embodiment, the first substrate 100 further includes a second conductive layer 140, the second conductive layer 140 is disposed between the first conductive layer 110 and the first substrate 100, and the second conductive The layer 140 is insulated from the first conductive layer 110 , and the second conductive layer 140 covers the gaps between the plurality of first electrodes 111 . Please refer to FIG. 6 , which is a partial cross-sectional view of a third embodiment of the display device of the present invention. The second conductive layer 140 includes a plurality of independent third electrodes 141. Unlike the second embodiment, in this embodiment, the second substrate 200 also has a plurality of independent fourth electrodes 240. The first substrate 100 and the second substrate 200 are also provided with a plurality of second conductive bumps 310, the plurality of second conductive bumps 310 correspond to the plurality of fourth electrodes 240 one by one, and the third electrodes 141 on the second substrate 200 The projection corresponds to at least one fourth electrode 240 , and each second conductive bump 310 is electrically connected to the corresponding third electrode 141 and fourth electrode 240 . Each second conductive bump 310 is electrically connected to the corresponding third electrode 141 and the fourth electrode 240 . As shown in FIG. 6 , a first insulating layer 150 is disposed between the second conductive layer 140 and the first conductive layer 110 , and the second conductive bump 310 and the third electrode 141 are electrically connected through the through holes on the first insulating layer 150 . connect.

In the second embodiment and the third embodiment, since two conductive layers are provided on the first substrate 100, the potential of the first conductive layer 110 and the potential of the second conductive layer 140 can be set to be the same during the display period; Alternatively, the first conductive layer 110 and the second conductive layer 140 are short-circuited so that both the first conductive layer 110 and the second conductive layer 140 serve as a common electrode layer. In addition, the implementation of the electrical connection between the second electrode 210 and the touch detection chip 250 and the implementation of the electrical connection between the fourth electrode 240 and the touch detection chip 250 in the second embodiment and the third embodiment are the same as those in the first embodiment. The embodiments are similar and will not be repeated here.

In the present invention, the first conductive bump 300 may include a spacer and a conductive layer, and the conductive layer covers the spacer. Certainly, the first conductive bump 300 may also be entirely made of conductive materials. Since the first conductive bump 300 is disposed between the first substrate 100 and the second substrate 200, in addition to being electrically conductive, the first conductive bump 300 can also support the first substrate 100 to maintain the first substrate 100 and the second substrate 200. The distance between the second substrates 200 . When making a display device, the first conductive bump 300 can be formed on the first substrate 100 first, and then the first substrate 100 and the second substrate 200 are aligned; or, the first conductive bump 300 can be formed on the second substrate first. On the substrate 200 , the first substrate 100 and the second substrate 200 are boxed together. The second conductive bump 310 is similar to the first conductive bump 300 , and will not be repeated here.

In the display device of the present invention, the conductive layer on the first substrate is divided into a plurality of independent first electrodes, and at the same time, a plurality of first conductive bumps arranged between the first substrate and the second substrate and a plurality of first conductive bumps arranged on the second substrate are arranged together. The plurality of second electrodes on the second substrate realizes the electrical connection between the first electrodes and the touch detection chip 250, so that the display device of the present invention adds a touch function in addition to the original display function.

Through the above detailed description of the preferred embodiments, it is hoped that the characteristics and spirit of the present invention can be described more clearly, and the protection scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, the intention is to cover various changes and equivalent arrangements within the protection scope of the appended claims of the present invention. Therefore, the protection scope of the claims applied for in the present invention should be interpreted in the broadest way based on the above description, so as to cover all possible changes and equivalent arrangements.

Claims (10)

1. a display device, it is characterised in that comprise:

First substrate, has the first conductive layer, and this first conductive layer comprises separate a plurality of first electrodes；

A plurality of first conductive projections, are arranged between this first substrate and this second substrate；And

Second substrate, is oppositely arranged with this first substrate, and this second substrate has touch detection chip and separate answering Several second electrodes, these a plurality of first conductive projections and these a plurality of second electrode one_to_one corresponding, each first electrode is in this Projection correspondence at least one second electrode on second substrate, each first conductive projection electrically connects the first corresponding electrode and the Two electrodes, these a plurality of second electrodes electrically connect this touch detection chip, and this touch detection chip is in the display time period pair These a plurality of second electrodes load common electrode signal, in the touch-control time period by detecting the capacitance of these a plurality of first electrodes Change is to judge position of touch.

Display device the most according to claim 1, it is characterised in that: this first substrate also comprises the second conductive layer, and this is years old Two conductive layers are arranged between this first conductive layer and this first substrate, and this second conductive layer is the most exhausted with this first conductive layer Edge, this second conductive layer covers this plurality of first interelectrode spaces.

Display device the most according to claim 2, it is characterised in that: this second conductive layer comprises separate a plurality of 3rd electrode, this second substrate also has separate a plurality of 4th electrodes, this first substrate and this second substrate it Between be additionally provided with a plurality of second conductive projection, these a plurality of second conductive projections and these a plurality of 4th electrode one_to_one corresponding, Each 3rd electrode projection correspondence at least the 4th electrode on this second substrate, each second conductive projection electrical connection is relatively The 3rd electrode answered and the 4th electrode.

Display device the most according to claim 3, it is characterised in that: have between this second conductive layer and this first conductive layer The first insulating barrier, the second corresponding conductive projection and the 3rd electrode is had electrically to connect through the first through hole on this first insulating barrier Connect.

Display device the most according to claim 2, it is characterised in that: this first conductive layer and this second conductive layer are in display Time period current potential is identical；Or this first conductive layer and this second conductive layer are in the short circuit of display time period.

Display device the most according to claim 1, it is characterised in that: it is additionally provided with complex root transmission on this second substrate and leads Line, this complex root transfer wire electrically connects this touch detection chip, and each transfer wire electrical connection at least one second electrode.

Display device the most according to claim 6, it is characterised in that: it is additionally provided with the first switch on this second substrate, should One end of first switch electrically connects this transfer wire, and the other end of this first switch electrically connects the second electrode, and this first switch exists The touch-control time period selectively turns on.

Display device the most according to claim 1, it is characterised in that: it is additionally provided with same layer on this second substrate but is not attached to A plurality of second public electrodes, these a plurality of second electrodes electrically connect this touch detection by these a plurality of second public electrodes Chip.

Display device the most according to claim 8, it is characterised in that: being additionally provided with gate line on this second substrate, this is multiple The bearing of trend of several second public electrodes is parallel with this gate line.

Display device the most according to claim 1, it is characterised in that: each first conductive projection comprises sept and leads Electric layer, this conductive layer is coated with this sept.