Liquid crystal display device with touch function

Abstract

Liquid crystal display device with a black matrix (31), multiple data lines (D1, D2, D3, D4 and D5) and multiple scanning lines (S1, S2 and S3), wherein the multiple data lines (D1, D2, D3, D4 and D5) are isolated and intersect the multiple scanning lines (S1, S2 and S3), and the multiple data lines (D1, D2, D3, D4 and D5) and the multiple scanning lines (S1, S2 and S3) define multiple pixel units, Each of the multiple pixel units has a common electrode (10, 20, 40, 50 and 60) and a pixel electrode (11, 21, 41, 51 and 61), an insulating layer (12, 22 and 42) is arranged between the common electrode (10, 20, 40, 50 and 60) and the pixel electrode (11, 21, 41, 51 and 61), a field is formed within the plane through the common electrode (10, 20, 40, 50 and 60) and the pixel electrode (11, 21, 41, 51 and 61) when a voltage is applied to the common electrode (10, 20, 40, 50 and 60) and to the pixel electrode (11, 21, 41, 51 and 61), and several of the common electrodes (10, 20, 40, 50 and 60) are connected to each other to form a common electrode layer, the common electrode layer being further suited to form touch electrodes (15 and 45) and touch signal veins (16, 46, 56 and 66), each of the touch signal veins (16, 46,56 and 66) is electrically connected to the corresponding touch electrode (15 and 45), and several first columns (19, 29, 49, 59 and 69), which run parallel to the several data rows, are each located between adjacent touch electrodes (15) or between the touch electrode (15 and 45) and the adjacent touch signal wire (16, 46, 56 and 66), with the exception of a connection point (161, 461 and 561) between the touch signal wire (16, 46 and 56) and the touch electrode (15, 45), , the first slit (19, 29, 59 and 69) overlaps with the pixel electrode (11, 21, 51 and 61) within the pixel unit, wherein the black matrix (31) is configured to shield the data rows (D1, D2, D3, D4 and D5) and the sample rows (S1, S2 and S3), wherein the first slit (29 and 69) overlaps with the sample row (S1, S2 and S3) and the black matrix (31) comprises a first extension section (33) extending from a region corresponding to an overlap region of the first slit (29 and 69) and the sample row (S1, S2 and S3) to the interior of the pixel unit, and wherein the first extension section (33) overlaps with the first slit (29 and 69).

Description

AREA OF INVENTION

[0001] The present invention relates to a liquid crystal display device and in particular to a liquid crystal display device with a touch function. BACKGROUND OF THE INVENTION

[0002] When used as a flat screen display device, a liquid crystal display device (LCD device), a plasma display panel (PDP) device, a field emission display (FEE) device, and an electroluminescent display device (ELD device) each have a flat screen for displaying images. The flat screen has two combined, opposing transparent and insulated substrates, with a special luminescent or polarized material layer placed between the two substrates. In these flat screen display devices, the LCD device controls the transmittance of liquid crystals via an electric field to display images. For this purpose, the LCD device has a display panel with liquid crystal units, a backlight unit to direct light to the display panel, and a driver circuit to drive the liquid crystal units.Recently, there has been an increasing need to integrate a touch-sensitive field into the LCD device to detect an area of ​​the touch-sensitive field that is touched by hand or other means and to transmit touch-related information. Furthermore, to miniaturize the device, some components of the LCD device and the touch-sensitive field can be shared. However, this has led to the problem of defects due to mutual interference between the LCD device and the touch-sensitive field.

[0003] US 2012 / 0313881A1 discloses a shield positioned over the opening between individual common electrodes or the open slot between two adjacent edges of the common electrodes to reduce or eliminate the electric field that can extend from data lines through the opening or open slot and cause tilting of the liquid crystal material. The shield can be charged with a potential such that an electric field is generated essentially between the shield and the data line. Alternatively, the pixel electrode finger can be positioned over the opening or open slot so that the field strength of the electric field that can pass from the data line through the opening or open slot into the liquid crystal can be reduced or eliminated.

[0004] DE 10 2008 050 216 A1 discloses a touch sensor panel with coplanar single-layer touch sensors. The sensors and the metal traces are provided on a single layer of a substrate. SUMMARY OF THE INVENTION

[0005] It is an object of the invention to eliminate or at least reduce the disadvantages of known liquid crystal display devices. This object is achieved according to the invention by the subject matter of the independent claim.

[0006] The present application discloses a liquid crystal display device having multiple data lines and multiple scan lines, wherein the multiple data lines insulately intersect the multiple scan lines and the multiple data lines and the multiple scan lines define multiple pixel units, wherein the multiple pixel units have a common electrode and a pixel electrode, an insulating layer is arranged between the common electrode and the pixel electrode, a field in the same plane is formed by the common electrode and the pixel electrode when a voltage is applied to the common electrode and the pixel electrode, and several of the common electrodes are connected to each other to form a common electrode layer, wherein the common electrode layer is further suited to form touch electrodes and touch signal veins.wherein each of the touch signal veins is electrically connected to the corresponding touch electrode, and wherein several first columns, running parallel to the multiple data rows, are provided between adjacent touch electrodes or between the touch electrode and the adjacent touch signal vein, with the exception of a connection point between the touch signal vein and the touch electrode, and wherein the first column within the pixel unit overlaps with the pixel electrode. In the liquid crystal display device according to embodiments of the disclosure, although the touch function is included, the transmittance of the liquid crystal display device is very uniform. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a schematic representation of an array substrate of a liquid crystal display device according to a first embodiment of the disclosure; Fig. Figure 2 is a schematic representation of a common electrode layer of the liquid crystal display device according to the first embodiment of the disclosure; Fig. 3 is a section view along a line A1-A2 from Fig. 1; Fig. 4A is a graph showing the transmittance of a pixel unit where columns are arranged in the common electrode layer above the data rows; Fig. 4B is a graph showing the transmittance of a pixel unit where there is no gap in the common electrode layer above a data row; Fig. Figure 5 is a schematic representation of the transmittance of one of the pixel units of the liquid crystal display device according to the first embodiment of the disclosure; Fig. 6 is a schematic representation of a liquid crystal display device according to a second embodiment of the disclosure; Fig. 7 is a section view along a line B1-B2 from Fig. 6; Fig. 8 is a section view along a line C1-C2 from Fig. 6; Fig. Figure 9 is a schematic representation of an array substrate of a liquid crystal display device according to a third embodiment of the disclosure; Fig. 10 is a section view along a line D1-D2 from Fig. 9; Fig. Figure 11 is a schematic representation of a common electrode layer of the liquid crystal display device according to the third embodiment of the disclosure; Fig. Figure 12 is a schematic representation of an array substrate of a liquid crystal display device according to a fourth embodiment of the disclosure; Fig. Figure 13 is a schematic representation of a common electrode layer of the liquid crystal display device according to the fourth embodiment of the disclosure; Fig. Figure 14 is a schematic representation of a common electrode layer of another liquid crystal display device according to the fourth embodiment; and Fig. Figure 15 is a schematic representation of an array substrate of another liquid crystal display device according to the fourth embodiment. DETAILED DESCRIPTION OF THE EXECUTION FORMS

[0007] In a first embodiment of the present disclosure, an LCD device is provided. With reference to the Fig. 1 to 3 is Fig. 1 a schematic representation of an array substrate of the LCD device according to the first embodiment of the present disclosure, Fig. 2 a schematic representation of a common electrode layer of the liquid crystal display device according to the first embodiment of the present disclosure and Fig. 3 a sectional view along a line A1-A2 from Fig. 1. The LCD device has multiple data lines, e.g., D1, D2, D3, D4, and D5, and multiple sample lines, e.g., S1, S2, and S3. The multiple data lines intersect the multiple sample lines in an isolating manner, and the multiple data lines and the multiple sample lines define multiple pixel units to form a pixel unit array. Fig. Figure 1, for example, illustrates only pixel units in 3 rows and 5 columns.

[0008] Each pixel unit has a common electrode 10 and a pixel electrode 11. An insulating layer 12 is arranged between the common electrode 10 and the pixel electrode 11, and a field in the same plane can be formed by the common electrode 10 and the pixel electrode 11. In the first embodiment, the common electrode 10 is arranged, in particular, below the pixel electrode 11, and the common electrode 10 is a planar electrode. The pixel electrode 11 comprises several ribbon electrodes 111. The field in the same plane formed between the planar common electrode 10 and the several ribbon electrodes 111 of the pixel electrode 11 is intended to drive liquid crystal molecules so that they rotate. The field in the same plane refers, in particular, to an electric field formed between the pixel electrode 11 and the common electrode 10 and is aligned parallel to the array substrate.In a display mode of the type Fringe-Field Switching (FFS) or In-Plane Switching (IPS), the liquid crystal molecules are driven to display images from a field in the same plane. The liquid crystal display device according to the disclosure can be an FFS liquid crystal display device or an IPS liquid crystal display device.

[0009] With reference to Fig. 2 is a common electrode layer that forms several of the common electrodes 10 and is further suited to form touch electrodes 15 and touch signal veins 16 of a touch structure. Each touch signal vein 16 is electrically connected to a corresponding touch electrode 15. First columns 19, which run parallel to the data rows, are present between the adjacent touch electrodes 15 or between the touch electrode 15 and the adjacent touch signal vein 16, with the exception of a connection point 16 between the touch signal vein 16 and the touch electrode 15. The first columns 19 overlap with the pixel electrode 11.

[0010] In the prior art, the common electrode layer is, in particular, a complete plane with respect to the pixel unit array, and the portion of the common electrode layer corresponding to each pixel unit forms a common electrode, and several of the common electrodes are interconnected. In the first embodiment of the disclosure, the touch electrodes 15 and the touch signal wires 16 are formed by etching the common electrode layer. The dimensions of the touch electrode 15 are generally much larger than a pixel unit and can correspond to a size of 60 x 60 pixel units.However, there are gaps between adjacent touch electrodes 15 and between the adjacent electrode 15 and the touch signal wire 16 to separate and isolate the adjacent touch electrodes 15 from each other and the adjacent touch signal wire 16 from each other. The gaps include the first column 19, which runs parallel to the data rows, with the first column 19 overlapping the ribbon electrodes 111 of the pixel electrode 11.

[0011] In the first embodiment, the contact structure is a single-layer structure with intrinsic capacitance. In other embodiments, the common electrode layer can also be used to form other structures or other types of contact structures.

[0012] In a known touch-enabled liquid crystal display, the columns in the common electrode layer overlap the data lines. Since a black matrix on a color filter substrate is placed over the data lines, thus covering the columns, they are invisible. However, the columns overlapping the data lines affect the image display. Particularly when displaying a low-grayscale image, the columns in the common electrode layer over the data lines are visible to the human eye, resulting in a poor display. With reference to Fig. 4A and Fig. 4B is Fig. 4A a graph showing the transmittance of a pixel unit where the columns lie in the common electrode layer above the data rows, and Fig. Figure 4B shows a graph illustrating the transmittance of a pixel unit where there is no gap in the common electrode layer across a data row. As in Fig. As can be seen in Figure 4A, the data lines at the 5 µm and 35 µm positions are arranged along a distance axis, resulting in essentially zero transmittance at these positions. Fig. 4A represents the two positions circled by dashed lines where the pixel electrodes are located close to the data lines, and where the transmittance is also much lower than in an area near the interior of the pixel unit. Referring now to Fig. 4B: The transmittance is uniform and is not affected by the data lines in the pixel unit along the distance axis. This is mainly due to the common electrode layer above the data lines shielding their electrical field. If columns are present above the data lines, their electrical field negatively impacts the display of the pixel units, thus reducing transmittance.

[0013] To shield the data lines through the common electrode layer in the first embodiment of the disclosure, the first columns 19 are arranged such that they overlap with the pixel electrodes 11. In particular, the first columns 19 are arranged such that they overlap at least partially with the multiple ribbon electrodes 111 of the pixel electrodes 11. The portion of the first column 19 that is shielded by the ribbon electrode 111 has no negative effect on the display effect of the pixel units.

[0014] Preferably, the first columns 19 completely overlap with the band electrodes 111 in the pixel electrode 11 and are thus completely shielded by the band electrodes 111, so that the first columns 19 have no negative effect on the display effect of the pixel units.

[0015] Taking into account available techniques and actual design, it is permissible for the distance between an edge of the first slit 19 and an edge of the band electrode 111, which overlaps with this first slit 19, to be less than 1 µm, such a distance having no significant effect on the display effect of the pixel units.A projection of each first slit 19 optionally coincides in the direction of light transmission with a projection of the corresponding band electrode 111 of the pixel electrode 11, wherein each of the first slits 19 completely overlaps with the corresponding band electrode 111 and the width of the first slit 19 is less than the width of the corresponding band electrode 111, or the projection of the corresponding band electrode 111 of the pixel electrode 11 coincides in the direction of light transmission with the projection of the first slit 19, wherein each of the first slits 19 completely overlaps with the corresponding band electrode 111 and the width of the corresponding band electrode 111 is less than the width of the first slit 19, as long as the distance between the adjacent edges of the first slit and the band electrode 111 does not exceed 1 µm.

[0016] With reference to Fig. Figure 5, which shows a schematic representation of the transmittance of a pixel unit of the liquid crystal display device according to the first embodiment of the disclosure, the pixel electrode 11 comprises three ribbon electrodes 111. The first slit 19 overlaps with the middle of the three ribbon electrodes 111, the edge of the first slit 19 is spaced 1 µm from the edge of the middle of the three ribbon electrodes 111, and the pixel unit operates at a low grayscale level. As shown in Figure 5, the transmittance of a pixel unit is 1 µm. Fig. 5 can be seen across the entire width of a pixel unit, which, as on the distance axis, Fig. 5 is specified, at 35 µm the transmittance is uniform and the display effect is good across the entire width of a pixel unit.

[0017] In the first embodiment of the disclosure, the first gap 19 overlaps with the middle of the three band electrodes 111. In other embodiments, the first gap 19 can overlap with any of the three band electrodes 111 of the pixel electrode 11, while maintaining the same effect as in the first embodiment.

[0018] All first columns 19 are preferably located within the pixel units of the same color. As shown above, the edge of each first slit 19 can be spaced at a certain distance from the edge of the band electrode 111 that overlaps with the first slit 19, which slightly affects the display effect. This is because the transmittance of a pixel unit with the first slit 19 differs slightly from that of a pixel unit without the first slit 19. If all first columns 19 are arranged within the pixel units of the same color, the effect caused by the transmittance difference is visibly reduced. All first columns 19 are preferably arranged in the blue pixel units, since the human eye is primarily insensitive to blue among the colors red, green, and blue, thus further reducing the effect caused by the transmittance difference.

[0019] In a second embodiment of the disclosure, a liquid crystal display device is provided. With reference to Fig. 6 to Fig. 8 is Fig. 6 a schematic representation of the liquid crystal display device according to the second embodiment of the disclosure, Fig. 7 a section view along a line B1-B2 from Fig. 6 and Fig. 8 a section view along a line C1-C2 from Fig. 6. As with the liquid crystal display device of the first embodiment, the liquid crystal display device of the second embodiment has several data lines, e.g. D1, D2, D3, D4 and D5, and several scanning lines, e.g. S1, S2 and S3 (where only one data line S2 in Fig. (as shown in Figure 8). The multiple data lines intersect the multiple sample lines in an isolating manner, and the multiple data lines and the multiple sample lines define multiple pixel units, each of which has a common electrode 20 and a pixel electrode 21. An insulating layer 22 is arranged between the common electrode 20 and the pixel electrode 21, and a coplane field can be formed by the common electrode 20 and the pixel electrode 21. In the second embodiment, the common electrode 20, which is a planar electrode, is arranged below the pixel electrode 21, and the pixel electrode 21 comprises multiple ribbon electrodes 211. The coplane electric field formed between the common electrode 20 and the multiple ribbon electrodes 211 of the pixel electrode 21 is used to drive the rotation of liquid crystal molecules.A common electrode layer, forming several of the common electrodes 20, is further suitable for forming touch electrodes and touch signal veins of a touch structure. Each touch signal vein is electrically connected to the corresponding touch electrode, and first columns 29, running parallel to the data row, are present between adjacent touch electrodes or between the touch electrode and the adjacent touch signal vein, with the exception of a connection point between the touch signal vein and the touch electrode. Each of the first columns 29 overlaps with a pixel electrode 21.

[0020] The liquid crystal display device further comprises a color filter substrate 30, and a black matrix 31 is arranged on one side of the color filter substrate 30 facing the array substrate. The black matrix 31 corresponds to the multiple data rows and the multiple sample rows and shields the multiple data rows and the multiple sample rows. Color filters are also arranged in the columns of the black matrices 31. The color filters here comprise blue color filters B, green color filters G, and red color filters R. The first columns 29 are preferably arranged within the pixel units corresponding to the blue color filters B.

[0021] The common electrode further comprises a second slit 28. The second slit 28 is specifically arranged within a pixel unit corresponding to the blue color filter B, wherein no first slit 29 is arranged within the pixel unit in which the second slit 28 is located. The width of the second slit 28 corresponds to the width of the first slit 29. Similar to the first slit 29, the second slit 28 also overlaps with one of the multiple band electrodes 211 of the pixel electrode 21.

[0022] The first columns 29 are each arranged within the pixel units corresponding to the blue color filters B, since the human eye is least sensitive to blue light. This reduces the influence caused by the difference in transmittance. To ensure uniform transmittance among the pixel units corresponding to the blue color filters B, the second column 28 is located in the common electrode of the blue pixel unit, excluding the first column 29. The width of the second column 28 is the same as that of the first column 29, and the second column 28 also overlaps with one of the multiple band electrodes 211 of the pixel electrode 21. The pixel units corresponding to all the blue color filters B are thus provided with columns of the same width on the common electrode layer, resulting in a more uniform display effect.

[0023] A conductive metal layer 32 is preferably arranged at positions on the common electrode layer corresponding to the data lines or scanning lines. The conductive metal layer 32 is electrically connected to the common electrode layer. The conductive metal layer 32 completely overlaps the data lines or scanning lines in the direction of light transmission and is also shielded by the black matrix 31. Since the common electrode layer is typically made of high-resistance indium tin oxide, the resistance can be reduced by adding the conductive metal layer 32, thus reducing the energy consumption for transmitting the touch signal. Furthermore, since the conductive metal layer 32 is shielded by the black matrix 31, the display effect is not affected.In other implementations, the conductive metal layer can alternatively be arranged below the common electrode layer and electrically connected to the common electrode layer.

[0024] The first slit 29 overlaps with the scanning line. The black matrix 31 preferably extends towards the interior of the pixel unit to form a first extension section 33 in an overlap region where the first slit 29 and the scanning line overlap. The first extension section 33 partially shields the first slit 29. The first slit 29 typically penetrates several slits of the pixel units, causing the first slit 29 to overlap with the scanning line(s). This means that the common electrode layer cannot shield the scanning line in the overlap region, and the electric field of the scanning lines affects the display. Therefore, in this embodiment, the first extension section 33 of the black matrix 31 is designed to partially shield the first slit 29 in order to eliminate this interference.If the length of the first expansion section 33 is in the range of 1 µm to 3 µm, an abnormal indication is preferably partially shielded without excessively reducing the aperture ratio. The first expansion section 33 can preferably be rectangular or trapezoidal.

[0025] At the second slit 28, the black matrix 31 preferably extends towards the interior of the pixel unit to form a second extension section whose shape corresponds to the shape of the first extension section 33. The first extension section 33, located at the pixel unit corresponding to the first slit 29, is primarily intended to shield the anomalous display caused by the electric field of the scanning lines.The second column 28 does not necessarily overlap with the scanning lines in order to expose the scanning lines from the common electrode layer, but since the first extension section 33 partially reduces the aperture ratio, the second extension section, corresponding to the second slit 28, is also arranged, the shape of the second extension section corresponding to the shape of the first extension section 33 in order to reduce the aperture ratio to the same extent and to ensure a uniform visual effect, thereby achieving uniformity of representation.

[0026] In the third embodiment of the disclosure, a liquid crystal display device is provided. With reference to Fig. 9 to Fig. 11 is Fig. 9 a schematic representation of an array substrate of the liquid crystal display device according to the third embodiment of the disclosure, Fig. 10 a sectional view along a line D1-D2 from Fig. 9 and Fig. 11 a schematic representation of a common electrode layer of the liquid crystal display device according to the third embodiment of the disclosure.

[0027] As shown in the figures, the liquid crystal display device has multiple data lines, e.g., D1, D2, D3, D4, and D5, and multiple sample lines, e.g., S1, S2, and S3. The multiple data lines intersect the multiple sample lines in an isolating manner, and the multiple data lines and the multiple sample lines define multiple pixel units. Fig. 9 simply shows pixel units in 3 rows and 5 columns.

[0028] Each pixel unit has a common electrode 40 and a pixel electrode 41, an insulating layer 42 is arranged between the common electrode 40 and the pixel electrode 41, and a field in the same plane can be formed by the common electrode 40 and the pixel electrode 41. In the third embodiment, the common electrode 40 is arranged above the pixel electrode 41, which is a planar electrode, and the common electrode 40 has a third gap 48 for forming the field in the same plane with the pixel electrode 41.

[0029] With reference to Fig. 11 is a common electrode layer forming several of the common electrodes 40, furthermore suitable for forming touch electrodes 45 and touch signal veins 46 of a touch structure. Each touch signal vein 46 is electrically connected to a corresponding touch electrode 45, and first columns 49, running parallel to the data rows, are provided between adjacent touch electrodes 45 or between the touch electrode 45 and the touch signal vein 46 that are adjacent to each other, with the exception of a connection point 461 between the touch signal vein 46 and the touch electrode 45. The first column 49 overlaps at least partially with the third column 48.

[0030] The pixel electrode is designed as a planar electrode, and the common electrode is formed with slits, resulting in a structure for generating a field in the same plane. The first slits 49 between adjacent touch electrodes 45 and between the touch electrode 45 and the adjacent touch signal vein 46 overlap at least partially with the third slits 48, thereby compensating for the reduction in the aperture ratio caused by the first slit 49 and improving the display effect of the liquid crystal display device. The width of the first slit 49 can optionally be approximately 1 µm larger than that of the third slit 48.

[0031] The first column 49 are preferably all arranged within pixel units of the same color. The influence caused by the transmittance difference is visibly reduced by arranging all first column 49 within pixel units of the same color. All first column 49 are preferably arranged within pixel units corresponding to blue color filters, since the human eye is least sensitive to blue among red, green, and blue, thus further reducing the influence caused by the transmittance difference.

[0032] Preferably, a conductive metal layer is further arranged at a position on the common electrode layer corresponding to the data line or scanning line. The conductive metal layer is electrically connected to the common electrode layer. The conductive metal layer completely overlaps the data line or scanning line in the direction of light transmission and is also shielded by the black matrix. Since the common electrode layer is typically made of high-resistance indium tin oxide, the resistance can be reduced by adding the conductive metal layer, thus reducing the energy consumption when transmitting a touch signal. Furthermore, since the conductive metal layer is shielded by the black matrix, the display effect is not affected. In other implementations, the conductive metal layer can alternatively be arranged beneath the common electrode layer.

[0033] The first slit preferably overlaps the scanning line. The black matrix extends towards the interior of the pixel unit to form a first extension section in an overlapping area where the first slit and the scanning line overlap, partially shielding the first slit. The length of the first extension section is preferably in the range of 1 µm to 3 µm, and the first extension section can be rectangular or trapezoidal.

[0034] In the fourth embodiment of the disclosure, a liquid crystal display device is provided. With reference to the Fig. 12 and Fig. 13 is Fig. 12 a schematic representation of an array substrate of the liquid crystal display device according to the fourth embodiment of the disclosure and Fig. 13 A schematic representation of a common electrode layer of the liquid crystal display according to the fourth embodiment of the disclosure. The liquid crystal display device has multiple data lines, e.g. D1, D2, D3, D4 and D5, and multiple scanning lines, e.g. S1, S2 and S3. The multiple data lines intersect the multiple scanning lines in an isolating manner, and the multiple data lines and the multiple scanning lines define multiple pixel units. Fig. 12 simply shows pixel units in 3 rows and 5 columns.

[0035] Each pixel unit has a common electrode 50 and a pixel electrode 51. An insulating layer is arranged between the common electrode 50 and the pixel electrode 51, and a field in the same plane can be formed by the common electrode 50 and the pixel electrode 51. In the fourth embodiment, the common electrode 50, which is a planar electrode, is arranged below the pixel electrode 51, and the pixel electrode 51 comprises several ribbon electrodes 511. A field in the same plane can be formed between the planar common electrode 50 and the several ribbon electrodes 511 of the pixel electrode 51 to drive the rotation of the liquid crystal molecules.

[0036] With reference to Fig. 13 is a common electrode layer forming several of the common electrodes 50, furthermore suitable for forming touch electrodes and touch signal veins 56 of a touch structure. The touch electrodes comprise, in particular, driver electrodes 54 and sensing electrodes 55. The touch signal vein 56 connects adjacent driver electrodes 54 to one another. Gaps are provided between the driver electrodes 54, the sensing electrodes 55, and the touch signal veins 56, such that the driver electrodes 54 are separated and isolated from the sensing electrodes 55, except for a connection point 561 between the touch signal vein 56 and the driver electrode 54. The gaps include the first column 59, which runs parallel to the data rows, and the first column 59 overlaps with the pixel electrode 51.

[0037] In the fourth embodiment, the touch structure is a structure with two conductive layers, wherein the common electrode layer is one of the two conductive layers and forms the driver electrodes 54, the sensing electrodes 55, and the touch signal wire 56. The touch signal wire 56 is a wire for connecting the driver electrodes 54. The other of the two conductive layers is hereinafter referred to as the second conductive layer, and an insulating layer is arranged between the second conductive layer and the common electrode layer. The second conductive layer comprises second touch signal wires, each configured to connect the adjacent sensing electrodes 55. The second touch signal wire electrically connects two adjacent sensing electrodes 55 via a through-hole in the insulating layer.

[0038] In the fourth embodiment, the driver electrode 54 and the sensing electrode 55 are each essentially rhombic. The gap between the driver electrode 54 and the sensing electrode 55 is formed as a polygonal line. This polygonal gap includes the first gap 59, which runs parallel to the data lines. The first gap 59 overlaps the pixel electrode 51. In particular, the first gap 59 superimposes one of the several band electrodes 511 of the pixel electrode 51.

[0039] Alternatively, in other embodiments, detection electrodes adjacent to the touch signal wire are electrically connected to each other, with the second touch signal wire electrically connecting adjacent driver electrodes to each other via a through-hole in the insulating layer.

[0040] In the liquid crystal display device according to the fourth embodiment of the disclosure, the contact structure is a two-layer structure with mutual capacitance. In other embodiments, the common electrode layer may also be suitable for forming a two-layer structure with intrinsic capacitance.

[0041] With regard to the Fig. 14 and Fig. 15 is Fig. 14 a schematic representation of a common electrode layer of another liquid crystal display device according to the fourth embodiment of the disclosure and Fig. 15 a schematic representation of an array substrate of the further liquid crystal display device according to the fourth embodiment of the disclosure.

[0042] As shown in the figures, the liquid crystal display device has multiple data lines, e.g. D1, D2, D3, D4 and D5, and multiple sampling lines, e.g. S1, S2 and S3, wherein the multiple data lines are insulated and intersect the multiple sampling lines, and the multiple data lines and the multiple sampling lines define multiple pixel units. Fig. 15 simply shows pixel units in 3 rows and 5 columns.

[0043] Each pixel unit has a common electrode 60 and a pixel electrode 61. An insulating layer is arranged between the common electrode 60 and the pixel electrode 61, and a field in the same plane can be formed by the common electrode 60 and the pixel electrode 61. In the array substrate of the further liquid crystal display device according to the fourth embodiment, the common electrode 60 is arranged, in particular, above the pixel electrode 61, which is a planar electrode, and the common electrode 60 has a third gap 68 for forming a field in the same plane with the pixel electrode 61.

[0044] With reference to Fig.15 is a common electrode layer forming several of the common electrodes 60, further suited to forming touch electrodes and touch signal veins 66 of a touch structure. The touch electrodes comprise driver electrodes 64 and sensing electrodes 65, and each touch signal vein 66 electrically connects two adjacent driver electrodes 64. Gaps are provided between the driver electrodes 64, the sensing electrodes 65, and the touch signal veins 66, such that the driver electrodes 64 are separated and insulated from the sensing electrodes 65, except for a junction 661 between the touch signal vein 66 and the driver electrode 64. The gaps include a first column 69 that runs parallel to the data rows, with the first gap 69 overlapping the pixel electrode 61.

[0045] In a further liquid crystal display device according to the fourth embodiment, the touch structure is a structure with two conductive layers. The common electrode layer is one of the two conductive layers and forms the driver electrodes 64, the sensing electrodes 65, and the touch signal wires 66, and the touch signal wire 66 is configured to connect the driver electrodes 64. The other of the two conductive layers is hereinafter referred to as the second conductive layer, wherein an insulating layer is arranged between the second conductive layer and the common electrode layer. The second conductive layer comprises two additional touch signal wires for connecting adjacent sensing electrodes 65, and the second touch signal wire electrically connects two adjacent sensing electrodes 65 to each other via a through-hole in the insulating layer.

[0046] In the further liquid crystal display device according to the fourth embodiment, the driver electrode 64 and the sensing electrode 65 are each substantially rhombic. The gap between the driver electrode 64 and the sensing electrode 65 is formed as a polygonal line. The polygonal gap comprises a first gap 69, which is parallel to the data lines, and which overlaps with the pixel electrode 61. In particular, the first gap 69 overlaps at least partially with the third gap 68. The width of the first gap 69 is optionally larger than that of the third gap 68 by a difference of approximately 1 µm.

[0047] A conductive metal layer is preferably arranged at positions on the common electrode layer corresponding to the data lines or the scanning lines. The conductive metal layer is electrically connected to the common electrode layer and completely overlaps the data lines or scanning lines in the direction of light transmission. It is also shielded by the black matrix. Since the common electrode layer is typically made of high-resistance indium tin oxide, the resistance can be reduced by adding the conductive metal layer, thus reducing the energy consumption required to transmit the touch signal. Furthermore, because the conductive metal layer is shielded by the black matrix, the display effect is not affected. In other implementations, the conductive metal layer can alternatively be located beneath the common electrode.

[0048] The slit 69 preferably overlaps with the scanning line, and the black matrix extends towards the interior of the pixel unit to form a first extension section in an overlap region where the first slit 69 and the scanning line overlap, thus partially shielding the first slit 69. The first slit 69 typically penetrates several columns of the pixel units, causing it to overlap with the scanning line(s). This means that the common electrode layer cannot shield the scanning lines in the overlap region, and the electric field of the scanning lines affects the display. Therefore, in this embodiment, the first extension section of the black matrix is ​​designed to partially shield the first slit 69 to eliminate this interference.If the length of the first expansion section is in the range of 1 µm to 3 µm, an abnormal indication is preferably partially shielded without excessively reducing the aperture ratio. The first expansion section can preferably be rectangular or trapezoidal.

[0049] The first column 69 are preferably all located within pixel units of the same color. By arranging all first column 69 within pixel units of the same color, the influence caused by the transmittance difference is significantly reduced. All first column 69 are preferably arranged within the pixel units corresponding to the blue color filters, since the human eye is primarily insensitive to blue among red, green, and blue, thus further reducing the influence caused by the transmittance difference.

[0050] In a further liquid crystal display device according to the fourth embodiment of the disclosure described above, the contact structure is a two-layer structure with mutual capacitance. In further embodiments, the common electrode layer can also be suitable for forming a two-layer structure with intrinsic capacitance.

[0051] The above order of embodiments of the disclosure is intended only to describe the disclosure and not to indicate the priority of the embodiments. It is obvious that various modifications and changes can be made by a person skilled in the art to the present invention without departing from the inventive concept and scope. Therefore, if these modifications and changes made to the present invention relate to the scope of the invention as defined by the claims and their equivalents, the invention shall be deemed to have been disclosed.

Claims

[1] Liquid crystal display device with a black matrix (31), multiple data lines (D1, D2, D3, D4 and D5) and multiple scanning lines (S1, S2 and S3), wherein the multiple data lines (D1, D2, D3, D4 and D5) intersect the multiple scanning lines (S1, S2 and S3) in an isolating manner and the multiple data lines (D1, D2, D3, D4 and D5) and the multiple scanning lines (S1, S2 and S3) define multiple pixel units, Each of the multiple pixel units has a common electrode (10, 20, 40, 50 and 60) and a pixel electrode (11, 21, 41, 51 and 61), an insulating layer (12, 22 and 42) is arranged between the common electrode (10, 20, 40, 50 and 60) and the pixel electrode (11, 21, 41, 51 and 61), a field is formed within the plane through the common electrode (10, 20, 40, 50 and 60) and the pixel electrode (11, 21, 41, 51 and 61) when a voltage is applied to the common electrode (10, 20, 40, 50 and 60) and to the pixel electrode (11, 21, 41, 51 and 61), and several of the common electrodes (10, 20, 40, 50 and 60) are connected to each other to form a common electrode layer, the common electrode layer being further suited to form touch electrodes (15 and 45) and touch signal veins (16, 46, 56 and 66), each of the touch signal veins (16, 46,56 and 66) is electrically connected to the corresponding touch electrode (15 and 45), and several first columns (19, 29, 49, 59 and 69) running parallel to the multiple data rows are each located between adjacent touch electrodes (15) or between the touch electrode (15 and 45) and the adjacent touch signal wire (16, 46, 56 and 66), with the exception of a connection point (161, 461 and 561) between the touch signal wire (16, 46 and 56) and the touch electrode (15, 45), the first slit (19, 29, 59 and 69) overlaps with the pixel electrode (11, 21, 51 and 61) within the pixel unit, wherein the black matrix (31) is configured to shield the data rows (D1, D2, D3, D4 and D5) and the sample rows (S1, S2 and S3), wherein the first slit (29 and 69) overlaps with the sample row (S1, S2 and S3) and the black matrix (31) comprises a first extension section (33) extending from a region corresponding to an overlap region of the first slit (29 and 69) and the sample row (S1, S2 and S3) to the interior of the pixel unit, and wherein the first extension section (33) overlaps with the first slit (29 and 69). [2] Liquid crystal display device according to claim 1, wherein the common electrode (10 and 20) is arranged below the pixel electrode (11 and 21), the pixel electrode (11 and 21) has several band electrodes (111 and 211) and the first gap (19 and 29) overlaps with one of the several band electrodes (111 and 211) of the pixel electrode (11 and 21) in at least one of the several pixel units. [3] Liquid crystal display device according to claim 2, in which a projection of the first slit (19) which overlaps with one of the multiple band electrodes (111) of the pixel electrode (11) coincides in the direction of light transmission with a projection of one of the multiple band electrodes (111) and a distance from an edge of the first slit (19) to an edge of one of the multiple band electrodes (111) is less than or equal to 1 µm, or the projection of one of the multiple band electrodes (111) of the pixel electrode (11) coincides with the projection of the first slit (19) and the distance from the edge of the first slit (19) to the edge of one of the multiple band electrodes (111) is less than or equal to 1 µm. [4] Liquid crystal display device according to claim 1, wherein the common electrode (40 and 60) is arranged in the pixel unit above the pixel electrode (41 and 61), which is a planar electrode, the common electrode (40 and 60) has a third slit (48 and 68) for forming the field in the same plane as the pixel electrode (41 and 61), and the first slit (49 and 69) overlaps at least partially with the third slit (48 and 68). [5] Liquid crystal display device according to claim 1, wherein the multiple first columns (19, 49 and 69) in the pixel units are arranged with the same color. [6] Liquid crystal display device according to claim 5, wherein the multiple first columns (19, 49 and 69) are arranged in the blue pixel units. [7] Liquid crystal display device according to claim 2, in which in at least one of the multiple pixel units without the first slit (29) the common electrode (20) has a second slit (28), wherein a width of the second slit (28) corresponds to a width of the first slit (19) and the second slit (28) overlaps with the band electrode (211) of the pixel electrode (21). [8] Liquid crystal display device according to claim 5, in which in at least one of the several blue pixel units without the first slit (29) the common electrode (20) has a second slit (28), wherein a width of the second slit (28) corresponds to a width of the first slit (29) and the second slit (28) overlaps with the band electrode (211) of the pixel electrode (21). [9] Liquid crystal display device according to claim 1, wherein the length of the first extension section (33) of the black matrix (31) is in a range of 1 µm to 3 µm. [10] Liquid crystal display device according to claim 1, wherein the first extension section (33) of the black matrix (31) is rectangular or trapezoidal. [11] Liquid crystal display device according to claim 1, in which in at least one of the multiple pixel units excluding the first slit (29) the common electrode has a second slit (28), the width of the second slit (28) corresponds to the width of the first slit (29), and the second slit (28) overlaps with the band electrode (211) of the pixel electrode (21), the black matrix (31) extends to the interior of the at least one of the multiple pixel units excluding the first slit (29) to form a second extension section, and the second extension section has the same shape as the first extension section (33). [12] Liquid crystal display device according to claim 1, wherein a conductive metal layer (32) is arranged above or below the common electrode layer in positions corresponding to the data lines (D1, D2, D3, D4 and D5) or the scanning lines (S1, S2 and S5), and the conductive metal layer (32) is electrically connected to the common electrode layer.

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