JP6240278B2 - LCD with built-in touch panel - Google Patents

Description

  The present invention relates to a liquid crystal display device with a built-in touch panel.

  Touch panel technology that supports graphical user interfaces has become important for the spread of mobile devices. As a touch panel technology, a capacitive bonding type touch panel is known. In a general capacitive bonding type touch panel, a touch panel substrate with a conductive coating (transparent conductive film) is provided on the surface of a glass substrate, and the position is detected by touching a finger on the touch panel substrate. There is also known a liquid crystal display panel with a touch panel that performs an operation corresponding to a menu by attaching a touch panel substrate to the liquid crystal display panel and touching a menu screen displayed on the liquid crystal display panel with a finger (Patent Document 1). reference).

JP 2006-146895 A

  In the display panel with a touch panel, the touch panel is used on the display area surface of the display panel that displays image or character information. However, in the conventional display panel with a touch panel, the touch panel and the display panel are manufactured separately, Combined with each other to make the final product. Therefore, in the conventional display panel with a touch panel, since the touch panel manufactured separately and the display panel need to be stacked, there is a problem that the display panel with the touch panel becomes thick and a countermeasure for overlay deviation when stacking is required. there were.

  An object of the present invention is to provide a display device with a built-in touch panel that can be made thinner than the conventional one by incorporating a touch panel, and does not require a countermeasure against overlay deviation.

  (1) A liquid crystal display device with a built-in touch panel according to the present invention includes a liquid crystal material, a first substrate and a second substrate sandwiching the liquid crystal material, and a pixel electrode formed between the first substrate and the second substrate. A common electrode formed between the first substrate and the second substrate, a detection electrode formed on the first substrate, and a second electrode formed on the second substrate so as to be electrically connected to the common electrode. And driving the liquid crystal material with an electric field formed between the pixel electrode and the common electrode to block the electric field formed between the detection electrode and the common electrode. The presence / absence of a touch is detected by a difference in capacitance depending on the presence / absence of a substance, and the common electrode includes a plurality of divided electrode portions extending in a horizontal direction and arranged next to each other in a vertical direction, , At least one of the divided power The plurality of common wires are adjacent to each other in the width direction orthogonal to the length, and the widths of the common wires are different from each other. Further, the longer the length, the wider the width. According to the present invention, the touch panel is configured by the first substrate, the detection electrode, and the common electrode, and the touch panel is built in. Therefore, the touch panel can be made thinner than the conventional one and no countermeasure for overlay deviation is required. In addition, since the plurality of common wires are formed so that the width becomes wider as the length is longer, the difference in resistance value due to the difference in length can be reduced.

  (2) In the liquid crystal display device with a built-in touch panel described in (1), each of the plurality of common wirings has one end in the region adjacent to the lateral direction of the common electrode, The position of the one end portion is shifted in the extension direction from one end portion in the extension direction, which is one of the longitudinal directions, in order from the longest common wire to the shortest common wire. It may be a feature.

  (3) In the liquid crystal display device with a built-in touch panel described in (2), the shortest common wiring is arranged on the side closest to the horizontal direction from the common electrode, and the side farthest in the horizontal direction from the common electrode The longest common wiring is arranged, and the plurality of common wirings may be separated from the common electrode in the lateral direction as the length increases.

  (4) In the liquid crystal display device with a built-in touch panel described in (3), each of the common wirings has a plurality of portions so that the widths are different in the length direction, except for at least the shortest common wiring. The number of the plurality of common lines is n, and extends in the width direction adjacent to the one end of the m (1 ≦ m) th common line from the shortest side on the opposite side to the extension direction. In the vertical region, the (m + 1) th to nth common wirings are arranged in parallel, and the horizontal line adjacent to the one end of the m (1 ≦ m) th common wiring from the shortest side is in the horizontal direction. In the side region, the (m + 1) th to nth common wires are arranged in parallel, and the vertical region is wider in the horizontal direction than the horizontal region, and the (m + 1) th to nth The common wiring has a width of a portion located in the vertical region, Wider than the width of the portion located on the side region may be characterized.

  (5) In the liquid crystal display device with a built-in touch panel according to (4), the difference in width in the horizontal direction between the vertical region and the horizontal region is the one end of the m-th common wiring. The width may be equal to the width in the horizontal direction.

  (6) In the liquid crystal display device with a built-in touch panel according to (5), the total of the widths of the portions located in the vertical region of the (m + 1) th to nth common wirings and the horizontal side The difference from the sum of the widths of the portions located in the region may be equal to the lateral width of the one end of the mth common wiring.

  (7) In the liquid crystal display device with a built-in touch panel according to any one of (1) to (6), each of the plurality of common wirings is electrically connected to two or more of the divided electrode portions. This may be a feature.

  (8) In the liquid crystal display device with a built-in touch panel described in any one of (1) to (6), each of the plurality of common wirings is electrically connected to one divided electrode portion. It may be a feature.

  (9) In the liquid crystal display device with a built-in touch panel described in any one of (1) to (8), each of the plurality of common wires and at least one of the divided electrode portions are connected at least one It may be characterized by being electrically connected by the unit.

  (10) In the liquid crystal display device with a built-in touch panel described in (9), the number of the at least one connection portion increases as the length of the one common wire electrically connected increases. It may be a feature.

  (11) In the liquid crystal display device with a built-in touch panel described in (9) or (10), the length of the at least one connection portion is shorter as the length of the one common wire that is electrically connected is shorter. It may be characterized by being long.

  (12) In the liquid crystal display device with a built-in touch panel according to any one of (9) to (11), the at least one connection portion has a length of one common wire that is electrically connected. The shorter the length, the thinner.

  (13) In the liquid crystal display device with a built-in touch panel described in any one of (1) to (12), the second substrate further includes a circuit, and the plurality of common wirings overlap the circuit. It may be characterized by being formed as described above.

  (14) In the liquid crystal display device with a built-in touch panel described in any one of (1) to (13), the pixel electrode and the common electrode are formed on the second substrate, and the pixel electrode and the common electrode are formed. The electric field formed between the two may be a transverse electric field.

It is sectional drawing of the liquid crystal display device with a built-in touch panel which concerns on embodiment of this invention. 1 is an exploded perspective view of a main part of a liquid crystal display device with a built-in touch panel according to an embodiment of the present invention. It is a perspective view which shows the detail of a 2nd board | substrate. It is a figure which shows the circuit for displaying an image on a liquid crystal display panel. It is a figure which shows the detail of a common electrode and common wiring. It is a figure which shows the VI-VI line cross section of the common wiring shown in FIG. It is a figure which shows the modification 1 of embodiment of this invention. It is a figure which shows the modification 2 of embodiment of this invention. It is a figure which shows the modification 3 of embodiment of this invention. It is a figure which shows the modification 4 of embodiment of this invention. It is a figure which shows the modification 5 of embodiment of this invention. It is a figure which shows the XII-XII line cross section of the common wiring shown in FIG. It is a figure which shows the structure which further deform | transformed the example shown in FIG. It is a figure for demonstrating the resistance value of a common wiring.

  FIG. 1 is a cross-sectional view of a liquid crystal display device with a built-in touch panel according to an embodiment of the present invention. The touch panel built-in type liquid crystal display device includes a first substrate 10 and a second substrate 12. A liquid crystal material 14 is disposed between the first substrate 10 and the second substrate 12. Alignment films 16 are formed between the first substrate 10 and the second substrate 12 at positions where the liquid crystal material 14 is sandwiched.

  The first substrate 10 is made of a light transmissive material (for example, glass). The first substrate 10 is a color filter substrate on which a colored layer and a black matrix (not shown) are formed. An alignment film 16 is formed on the first substrate 10. The alignment film 16 is formed on a colored layer and a black matrix (not shown).

  The second substrate 12 is made of a light transmissive material (for example, glass). The second substrate 12 is also called a TFT substrate because a thin film transistor 18 is formed. The thin film transistor 18 includes a semiconductor film 20 such as polysilicon, a gate insulating film 22 covering the semiconductor film 20, a gate electrode 24 disposed above the semiconductor film 20 with the gate insulating film 22 interposed therebetween, and the gate insulating film 22. A source electrode 26 and a drain electrode 28 which penetrate and are electrically connected to the semiconductor film 20.

  One of the source electrode 26 and the drain electrode 28 is electrically connected to the pixel electrode 30. A common electrode 34 is formed at a layer position different from that of the pixel electrode 30 with the insulating film 32 interposed therebetween. In the example of FIG. 1, the pixel electrode 30 is located above the common electrode 34 (on the side away from the second substrate 12), but may be disposed upside down.

  A liquid crystal display panel 36 is constituted by the above components, and the liquid crystal material 14 is driven by an electric field formed between the pixel electrode 30 and the common electrode 34. Since the pixel electrode 30 and the common electrode 34 are formed on the second substrate 12, the electric field formed between the pixel electrode 30 and the common electrode 34 is a lateral electric field. Alternatively, the pixel electrode 30 may be formed on the second substrate 12, the common electrode 34 may be formed on the first substrate 10, and the liquid crystal material 14 may be driven by a vertical electric field. In any configuration, the pixel electrode 30 and the common electrode 34 are disposed between the first substrate 10 and the second substrate 12.

  The liquid crystal display device with a built-in touch panel has a detection electrode 38 formed on the first substrate 10. In the example of FIG. 1, the detection electrode 38 is disposed on the surface of the first substrate 10 opposite to the liquid crystal material 14. Different voltages are applied to the detection electrode 38 and the common electrode 34 to form an electric field (fringe electric field) between the two (specifically, outside the opposing region). The presence / absence of a touch is detected based on the difference in capacitance due to the presence / absence of a substance (for example, finger 40) that blocks the electric field formed between the detection electrode 38 and the common electrode 34. That is, the touch panel 42 is configured by the first substrate 10, the detection electrode 38, and the common electrode 34. A front panel 46 is attached to the touch panel 42 via an adhesive layer 44 to be reinforced. According to the present embodiment, since the touch panel 42 is built in, the apparatus can be made thinner than before. In addition, since the liquid crystal display panel 36 and the touch panel 42 share the first substrate 10, it is not necessary to take measures against misalignment between them.

  FIG. 2 is an exploded perspective view of a main part of the liquid crystal display device with a built-in touch panel according to the embodiment of the present invention. The first substrate 10 has a rectangular planar shape, and a plurality of detection electrodes 38 extend in the vertical direction along the long side. A flexible wiring substrate 48 is attached to the first substrate 10 for electrical connection between the detection electrode 38 and the outside. An integrated circuit chip 50 incorporating a liquid crystal drive circuit is mounted on the second substrate 12, and a flexible wiring substrate 52 is attached for electrical connection with the outside.

  FIG. 3 is a perspective view showing details of the second substrate 12. The common electrode 34 includes a plurality of divided electrode portions 54 that extend in the horizontal direction and are arranged next to each other in the vertical direction. The second substrate 12 has a rectangular planar shape, and a plurality of divided electrode portions 54 extend in the lateral direction along the short side. The direction in which the plurality of divided electrode portions 54 extend and the direction in which the plurality of detection electrodes 38 (FIG. 2) extend intersect (for example, orthogonal).

  FIG. 4 is a diagram showing a circuit for displaying an image on the liquid crystal display panel 36. A pixel electrode 30 is formed in the image display area 56. Since pixels are formed by the plurality of pixel electrodes 30, an area surrounding the plurality of pixel electrodes 30 is an image display area 56. In the image display area 56, the common electrode 34 including a plurality of divided electrode portions 54 is formed. The divided electrode unit 54 is set to a reference potential (for example, GND), and a voltage corresponding to the brightness of the pixel is applied to the pixel electrode 30. An image is displayed by controlling light using an electric field generated between the pixel electrode 30 and the common electrode 34 (for example, driving the liquid crystal material 14).

  The common electrode 34 is electrically connected to the common wiring 58, and the pixel electrode 30 is electrically connected to the signal line 60. A switching element 62 (for example, the thin film transistor 18 shown in FIG. 1) is connected between the pixel electrode 30 and the signal line 60 so that the pixel electrode 30 and the signal line 60 can be electrically connected and disconnected. . The switching element 62 is connected to a scanning line 64 drawn from a scanning circuit (not shown), and is driven (ON / OFF) by a scanning signal input to the scanning line 64.

  FIG. 5 is a diagram showing details of the common electrode 34 and the common wiring 58. 6 is a view showing a cross section taken along line VI-VI of the common wiring 58 shown in FIG.

  The common electrode 34 is made of a transparent conductive material such as ITO (Indium Tin Oxide). Although the common electrode 34 includes a plurality of divided electrode portions 54, two or more (six in FIG. 5) divided electrode portions 54 are electrically connected to each other at the end portions. The common electrode 34 includes a connection portion 66 drawn from the divided electrode portion 54. The connection part 66 is integrally and continuously formed of the same material as that of the divided electrode part 54.

  A plurality of common wirings 58 made of, for example, metal are formed on the second substrate 12. As shown in FIG. 6, a first inorganic passivation film 68 and an organic passivation film 70 are sequentially stacked on the common wiring 58. On the organic passivation film 70, a connection portion 66 integrated with the divided electrode portion 54 is disposed. A second inorganic passivation film 72 is formed so as to cover the connection portion 66 and the organic passivation film 70.

  The first inorganic passivation film 68 has an opening 78 that exposes the common wiring 58. The organic passivation film 70 has a through hole 74 larger than the opening 78 so as to communicate with the opening 78. The second inorganic passivation film 72 is also provided on the inner surface of the through hole 74 of the organic passivation film 70, but does not block the opening 78 of the first inorganic passivation film 68. The second inorganic passivation film 72 has an opening 76 that exposes the connecting portion 66.

  A conductive film 80 is formed on the second inorganic passivation film 72. The conductive film 80 also extends inside the opening 76 and is electrically connected to the connection portion 66. The conductive portion 80 extends to the inside of the opening 78 and is electrically connected to the common wiring 58. The conductive film 80 continuously extends from the inside of the opening 76 to the inside of the opening 78. The conductive film 80 is formed simultaneously with the pixel electrode 30 with the same material (for example, ITO (Indium Tin Oxide)) as the pixel electrode 30 (see FIG. 1). The common wiring 58 and the connection portion 66 are electrically connected by the conductive film 80. The common wiring 58 is electrically connected to the common electrode 34 (see FIG. 5).

  As shown in FIG. 5, each of the plurality of common wirings 58 is electrically connected to at least one (for example, two or more) divided electrode portions 54. Each of the plurality of common wirings 58 and at least one (six in FIG. 5) divided electrode portion 54 are electrically connected by at least one (one in FIG. 5) connection portion 66.

  The plurality of common wirings 58 pass through adjacent regions in the direction (lateral direction) in which the common electrode 34 extends. The plurality of common wirings 58 are arranged next to each other in the width direction orthogonal to the length. As shown in FIG. 3, the shortest common wiring 58a is disposed on the side closest to the horizontal direction from the common electrode 34. The longest common wiring 58b is disposed on the side farthest from the common electrode 34 in the lateral direction. The plurality of common wires 58 are separated from the common electrode 34 in the lateral direction as the length increases (see FIG. 3).

  As shown in FIG. 5, each of the plurality of common wirings 58 has one end portion in a region adjacent to the common electrode 34 in the lateral direction (right side in FIG. 5). The common wiring 58 extends from one end in the extension direction (downward in FIG. 5) which is one of the vertical directions. As shown in FIG. 3, the positions of one end of the plurality of common lines 58 are shifted in the extending direction (downward in FIG. 5) in order from the longest common line 58b to the shortest common line 58a.

As shown in FIG. 5, the vertical region RL that extends in the width direction adjacent to one end of the m (1 ≦ m) th common wiring 58 from the shortest side on the opposite side to the extension direction has (m + 1). ) Th to nth (n is the number of common wires 58) common wires 58 are arranged in parallel. For example, taking the case of m = 1 as an example, the vertical region RL ₁ that extends in the width direction adjacent to one end portion of the first common wiring 58 from the shortest side on the opposite side to the extension direction includes: Second to nth (n is the number of common wires 58) common wires 58 are arranged in parallel. Taking the case of m = 2 as an example, the vertical region RL ₂ extending in the width direction adjacent to one end of the second common wiring 58 from the shortest side on the opposite side to the extension direction is the third one. To n-th common wiring 58 (n is the number of common wirings 58).

The (m + 1) th to nth common wirings 58 are arranged in parallel in the lateral region RW laterally adjacent to one end of the m (1 ≦ m) th common wiring 58 from the shortest side. For example, taking the case of m = 1 as an example, the lateral side area RW ₁ laterally adjacent to one end of the shorter from the first common lines 58, n-th common line from the second 58 Are in parallel. Taking the case of m = 2 as an example, the lateral side area RW ₂ laterally adjacent to one end of the shorter from the second common lines 58, n-th common line 58 parallel with the third To do.

The vertical region RL is wider in the horizontal direction than the horizontal region RW. The difference in the lateral width between the vertical region RL and the lateral region RW adjacent to the mth common wiring 58 is equal to the lateral width of one end of the mth common wiring 58. For example, the difference in the lateral width between the vertical region RL ₁ and the lateral region RW ₁ adjacent to the first common wiring 58 is the lateral width W _{1 of one} end of the first common wiring 58. be equivalent to.

The plurality of common wires 58 have different widths from each other, and are formed such that the longer the length, the wider the width. In the example shown in FIG.
W ₁ <W ₂ <... <W _n
Is established.

  Except at least the shortest common wiring 58, each common wiring 58 has a plurality of portions having different widths in the length direction. The shortest common wiring 58 may or may not have a plurality of portions so that the widths are different in the length direction.

  Each of the (m + 1) th to nth common wirings 58 has a width of a portion located in the vertical region RL adjacent to the mth common wiring 58 and a lateral region adjacent to the mth common wiring 58. It is wider than the width of the part located at RW.

For example, taking the case of m = 1 as an example, the second common wire 58 has a width W _{22 of} a portion located in the vertical region RL ₁ adjacent to the first common wire 58 and the first common wire 58. It is wider than the width W _{2 of} the portion located in the lateral region RW ₁ next to 58. Further, the third common wiring 58 has a width W _{32 of} a portion located in the vertical region RL ₁ adjacent to the first common wiring 58 in the horizontal region RW ₁ adjacent to the first common wiring 58. wider than the width W ₃ of the portion. The n-th common wiring 58 is a portion in which the width W _{n2 of} the portion located in the vertical region RL ₁ next to the first common wiring 58 is located in the horizontal region RW ₁ next to the first common wire 58. wider than the width _{W n} of.

Taking the case of m = 2 as an example, the third common wiring 58 has a width W _{33 of} a portion located in the vertical region RL ₂ next to the second common wiring 58 and the second common wiring 58 has a width W ₃₃ . wider than the width _{W 32} of the portion located in the lateral side area RW ₂ neighbors.

In the example of FIG. 5, the following expression is satisfied.
W ₂ <W ₂₂ , W ₃ <W ₃₂ <W ₃₃ ,..., W _n <W _n2 ... <W _nn

  The total width of the portions of the (m + 1) th to nth common lines 58 in the vertical region RL adjacent to the mth common line 58 and the (m + 1) th to nth common lines 58 are the mth number. The difference from the sum of the widths of the portions included in the lateral region RW adjacent to the common wiring 58 is equal to the lateral width of one end of the mth common wiring 58.

For example, taking the case of m = 1 as an example, the width W ₂₂ , W ₃₂ ,..., Of the portion of the second to nth common wiring 58 in the vertical region RL ₁ adjacent to the first common wiring 58. The difference between the sum of W _{n2 and} the sum of the widths W ₂ , W ₃ ,..., W _n of the portion in the lateral region RW ₁ adjacent to the first common wire 58 is one of the first common wires 58. equal to the width W ₁ of the end lateral. That is, the following expression is satisfied.
(W ₂₂ −W ₂ ) + (W ₃₂ −W ₃ ) +... + (W _n2 −W _n ) = W ₁

  According to the present embodiment, the plurality of common wirings 58 are formed such that the longer the length, the wider the width, so that the difference in resistance value due to the difference in length can be reduced.

[Modification]
FIG. 7 is a diagram illustrating a first modification of the embodiment of the present invention. In this example, an inorganic passivation film 182 is formed on the common wiring 158 as an example of an inorganic film. The inorganic passivation film 182 has a through hole 184 that exposes the common wiring 158. A connection portion 166 that is a part of the common electrode is formed on the inorganic passivation film 182 so as to be electrically connected to the common wiring 158 through the through hole 184. The common wiring 158 is electrically connected to the common electrode by the connection portion 166. This example is a modification of the structure shown in FIG. 6, and the details described in the above embodiment apply to other details.

  FIG. 8 is a diagram illustrating a second modification of the embodiment of the present invention. In this example, the connection portion 266 is thinner as the length of the electrically connected common wiring 258 is shorter. As described in the above embodiment, the common wiring 258 is shorter as it is closer to the common electrode 234. The connecting portion 266a connected to the common wiring 258a closest to the common electrode 234 is the thinnest. The connection portion 266 is thinner as the common wiring 258 that is electrically connected is closer to the common electrode 234. By making the connecting portion 266 thinner, the resistance value can be increased. Since the resistance value is lower as the length of the common wire 258 is shorter, the resistance from the other common wire 258 to the divided electrode portion 254 can be obtained by connecting the high resistance connection portion 266a to the low resistance common wire 258a. The difference from the value can be reduced.

  In addition, the length of the connection portion 266 is longer as the length of the electrically connected common wiring 258 is shorter. The connecting portion 266 is elongated by forming a bent shape. The length can be changed by changing the bent shape. The resistance value can be increased by lengthening the connection portion 266. Since the resistance value is lower as the length of the common wire 258 is shorter, the resistance from the other common wire 258 to the divided electrode portion 254 can be obtained by connecting the high resistance connection portion 266a to the low resistance common wire 258a. The difference from the value can be reduced. The details described in the above embodiment apply to other details.

  FIG. 9 is a diagram showing a third modification of the embodiment of the present invention. In this example, each of the plurality of common wirings 358 is electrically connected to one divided electrode portion 354. Alternatively, the divided electrode portion 354 shown in FIG. 9 is wider than the divided electrode portion 54 shown in FIG. Alternatively, one divided electrode portion 354 shown in FIG. 9 has a shape in which a plurality of divided electrode portions 54 shown in FIG. 5 are integrated. The details described in the above embodiment apply to other details.

  FIG. 10 is a diagram showing a fourth modification of the embodiment of the present invention. In this example, the number of connection portions 466 connected to the common wiring 458 increases as the length of the common wiring 458 increases. The number of connection portions 466a connected to the common wiring 458a closest to the common electrode 434 is the smallest. By increasing the number of connection portions 466, the resistance value can be lowered. Since the resistance value of the common wiring 458 is longer, the resistance value from the common wiring 458a to the divided electrode portion 454a can be increased by connecting the plurality of connection portions 466b having a low combined resistance value to the high resistance common wiring 458b. And the difference can be reduced. The details described in the above embodiment apply to other details.

  FIG. 11 is a diagram illustrating a fifth modification of the embodiment of the present invention. 12 is a view showing a cross section taken along line XII-XII of the common wiring shown in FIG. In this example, the second substrate 512 includes a circuit 586 such as a scanning circuit. The circuit 586 is composed of a film stacked on the second substrate 12. For example, a semiconductor film 520 made of polysilicon or the like is formed on the second substrate 12 as shown in FIG. 12, and a first metal film 590 is formed above the semiconductor film 520 with an insulating film 588 interposed therebetween. Yes. The first metal film 590 forms a gate electrode at a position not shown, and a thin film transistor is formed from a laminated film including these. The circuit 586 includes an active element such as a thin film transistor.

  The plurality of common wirings 558 are formed so as to overlap with the circuit 586. For example, an interlayer insulating film 592 is formed on the first metal film 590 for constituting the gate electrode, and a second metal film 594 for constituting the common wiring 558 is formed thereon. A first inorganic passivation film 568 and an organic passivation film 570 are sequentially stacked on the second metal film 594. A transparent conductive film 580 for forming a common electrode is formed on the organic passivation film 570, and a second inorganic passivation film 572 is formed thereon. The transparent conductive film 580 is made of ITO (Indium Tin Oxide) or the like. The details described in the above embodiment apply to other details.

  FIG. 13 is a diagram showing a structure obtained by further modifying the example shown in FIG. In this example, a metal film 596 is formed in contact with the bottom of the transparent conductive film 580. The metal film 596 is formed at a position overlapping the circuit 586 such as a scanning circuit, avoiding the image display region 556 (see FIG. 11). A part (for example, a connection portion) of the common electrode 534 formed of the transparent conductive film 580 is located outside the image display region 556, and the metal film 596 overlaps with the portion (the connection portion or the like). The resistance value from the wiring 558 to the divided electrode portion 554 can be lowered.

FIG. 14 is a diagram for explaining the resistance value of the common wiring. The end of the _mth common wiring 658 _{m and} the end of the (m−1) th common wiring 658 _m−1 are shown from the closest to the common electrode (not shown). the first region _{A 1} having a length of _{D 1} of the to the end of the (m-1) th common line _{658 m-1,} to the end of the m-th common line 658 _m adjacent to the first region _{A 1} The second region A ₂ having a length of D ₂ will be described as an example.

The width of the m-th common wiring 658 _m in the first area A ₁ is W _1A, and the width in the second area A ₂ is W _1B . In the example shown in FIG. 14, the second region A ₂ has a portion having a width smaller than the width W _1B , but an increase in resistance due to this is negligible. Then, the width in the (m-1) th common line ₆₅₈ first region _{A 1} of the _m-1 and _{W 2.} The common wirings 658 _m and 658 _m−1 are made of metal having the same film thickness, and these sheet resistances are both R _metal .

Connection portions 666 _m and 666 _m−1 which are part of the common electrode are connected to the common wirings 658 _m and 658 _m−1 . The connecting portions 666 _m and 666 _m−1 are made of ITO (Indium Tin Oxide), and the widths W _ito1 and W _ito2 are the same. Further, the connecting portions 666 _m and 666 _m−1 have different lengths as the positions of the common wirings 658 _m and 658 _m−1 are shifted, but the resistance value of the portion of the length difference W _min is assumed to be negligible, the length D ₁ of the first region a ₁ and the second region a _2, D ₂ is assumed to be equal to either the length D. That means
W _min ≒ 0
D ₁ = D ₂ = D
It is.

In these conditions, the resistance value _{R m} of the m-th common line 658 _m is
R _m = {(D × R _metal ) / W _1A } + {(D × R _metal ) / W _1B }
Next, the resistance value _{R m-1} of the (m-1) th common line _{658 m-1,} the
R _m-1 = {(D × R _metal ) / W ₂ }
It becomes.

Here, since the m-th common wiring 658 _m has an increased width in the second region A ₂ , the resistance is reduced as compared with the case where all are formed with the same width as the width W _1A of the first region A _1. The value R _decrease is
R _decrease = [{(D × R _metal ) / W _1A } + {(D × R _metal ) / W _1A }] − [{(D × R _metal ) / W _1A } + {(D × R _metal ) / W _1B }]
= {(D × R _metal ) / W _1A } − {(D × R _metal ) / W _1B }
= D x R _metal x (1 / W _1A -1 / W _1B )
= D × R _metal × {(W _1B −W _1A ) / W _1A × W _1B } (1)
It becomes.

Much as the width _{W 2} of the common wiring _{658 m-1} which is not present in the second region _{A 2,} if it in the second area _{A 2} is enlarged the width of the m-th common line 658 _m,
W _1B −W _1A ≒ W2
Therefore, substituting this into equation (1)
R _decrease = D1 x R _metal x {W2 / (W _1A x W _1B )}
It becomes.

Using the above relationship, adjacent to each other in the first area A ₁ or the second area A ₂ or the terminal of the common wiring 658 _m , 658 _m−1 (portion where a flexible wiring board (not shown) is connected). These common wirings 658 _m and 658 _m−1 can be designed to have the same resistance value.

  The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, the configuration described in the embodiment can be replaced with substantially the same configuration, a configuration that exhibits the same operational effects, or a configuration that can achieve the same purpose.

  10 first substrate, 12 second substrate, 14 liquid crystal material, 16 alignment film, 18 thin film transistor, 20 semiconductor film, 22 gate insulating film, 24 gate electrode, 26 source electrode, 28 drain electrode, 30 pixel electrode, 32 insulating film, 34 common electrode, 36 liquid crystal display panel, 38 detection electrode, 40 fingers, 42 touch panel, 44 adhesive layer, 46 front panel, 48 flexible wiring board, 50 integrated circuit chip, 52 flexible wiring board, 54 split electrode section, 56 image display Area, 58 common wiring, 60 signal line, 62 switching element, 64 scanning line, 66 connection portion, 68 first inorganic passivation film, 70 organic passivation film, 72 second inorganic passivation film, 74 through hole, 76 opening, 78 opening , 80 conductive film, 158 common Wire, 166 connection portion, 182 inorganic passivation film, 184 through hole, 234 common electrode, 254 divided electrode portion, 258 common wire, 266 connection portion, 354 divided electrode portion, 358 multiple common wires, 434 common electrode, 454 divided electrode Part, 458 common wiring, 466 connection part, 512 second substrate, 520 semiconductor film, 534 common electrode, 554 divided electrode part, 556 image display area, 558 common wiring, 568 first inorganic passivation film, 570 organic passivation film, 572 Second inorganic passivation film, 580 transparent conductive film, 586 circuit, 588 insulating film, 590 first metal film, 592 interlayer insulating film, 594 second metal film, 596 metal film, 658 common wiring, 666 connection part.

Claims (14)

Liquid crystal material,
A first substrate and a second substrate sandwiching the liquid crystal material;
A pixel electrode formed between the first substrate and the second substrate;
Between the first substrate and the second substrate, on the surface having said second substrate so as to extend in the horizontal direction and the vertical direction cross each other, lined next to each other in the longitudinal direction extends in the transverse direction A common electrode formed to include a plurality of divided electrode portions;
A detection electrode formed on the first substrate;
A plurality of common wires formed on the second substrate to be electrically connected to the common electrode;
An insulating film formed between the common electrode and the plurality of common wires;
A drive circuit for driving the liquid crystal material;
Have
Driving the liquid crystal material with an electric field formed between the pixel electrode and the common electrode;
Detecting the presence or absence of touch by the difference in capacitance due to the presence or absence of a substance that blocks the electric field formed between the detection electrode and the common electrode;
Each end of the plurality of common wirings is electrically connected to the common electrode,
The plurality of common wires pass through the adjacent wiring region in the lateral direction of the common electrode, are adjacent to each other in a width direction orthogonal to the extending direction of the common wire, and have a lateral width on a straight line extending in the width direction. And the width is different from each other, the longer the common wiring, the wider the width,
A plurality of openings arranged in the vertical direction are formed in the insulating film above the end portions of the common wires,
The common electrode is connected to the end of each of the common wires through the plurality of openings,
The plurality of divided electrode portions have a first divided electrode portion and a second divided electrode portion in order from the side closer to the drive circuit,
The wiring region includes a first wiring region adjacent to the horizontal direction of the first divided electrode portion and a second wiring region adjacent to the horizontal direction of the second divided electrode portion. And
Each common wiring that passes through both the first wiring area and the second wiring area has a first portion that passes through the first wiring area and a second portion that passes through the second wiring area. ,
It said second portion than said first portion Ri through the position closer to the common electrode in the lateral direction, the touch panel built-in liquid crystal display device comprising the possible width is wider than the first portion. The liquid crystal display device with a built-in touch panel according to claim 1.
Each of the plurality of common wirings has the end portion in the wiring region, and extends in the extension direction which is one of the longitudinal directions so as to approach the drive circuit from the end portion.
The liquid crystal display device with a built-in touch panel, wherein the end portions are arranged in the extension direction in order from the end portion of the longest common line to the end portion of the shortest common line. The liquid crystal display device with a built-in touch panel according to claim 2,
The end portion is formed on the side of the plurality of common wirings closest to the lateral direction with respect to the common electrode,
Among the plurality of common wires arranged on the straight line in the lateral direction from the end portion,
The shortest common wiring is arranged on the side closest to the lateral direction from the common electrode,
The longest common wiring is arranged on the side farthest in the lateral direction from the common electrode,
The liquid crystal display device with a built-in touch panel, wherein the plurality of common wires are separated from the common electrode in the lateral direction as the length increases. The touch panel built-in type liquid crystal display device according to claim 3,
Except for at least the shortest common wiring, each of the common wiring has a plurality of portions so that the width is different in the length direction,
The number of the plurality of common wires is n,
A region adjacent to the end of the m (1 ≦ m) th common wiring from the shortest side, the first region adjacent to the end on the side away from the drive circuit in the vertical direction, and the lateral direction In the vertical region including the second region adjacent to the first region on the side away from the common electrode, the end of the (m + 1) th common wiring and the (m + 2) th to nth common The wiring is parallel,
In a region adjacent to the end of the m (1 ≦ m) th common wiring from the shortest side, the lateral region adjacent to the end on the side away from the common electrode in the lateral direction, The (m + 1) th to nth common wires are in parallel,
The vertical region in which the nth common wiring is formed from the (m + 1) th end is more than the lateral region in which the (m + 1) th to nth common wiring is formed. , Wide in the lateral direction,
The liquid crystal display with a built-in touch panel, wherein the (m + 1) th to nth common lines are wider in a portion located in the vertical region than in a portion located in the horizontal region. apparatus. In the liquid crystal display device with a built-in touch panel according to claim 4,
The difference in width in the horizontal direction between the vertical region and the horizontal region adjacent to the end of the m (1 ≦ m) common wire from the shortest is the m-th common wire. A liquid crystal display device with a built-in touch panel, which is equal to the width in the lateral direction of the end portion. In the liquid crystal display device with a built-in touch panel according to claim 5,
In the vertical region adjacent to the end of the m-th common line, each of the (m + 1) -th to n-th common lines, including the (m + 1) -th end, Having a width in the longitudinal region,
In the lateral region adjacent to the end of the mth common wiring, each of the (m + 1) th to nth common wirings has a width in the lateral region,
The sum of the widths in the vertical regions of the (m + 1) th to nth common lines, including the (m + 1) th end, and the (m + 1) th to nth A liquid crystal display device with a built-in touch panel, wherein a difference between the width of each of the common wirings in the lateral region is equal to a width of the end of the mth common wiring in the horizontal direction .   7. The liquid crystal display device with a built-in touch panel according to claim 1, wherein the divided electrode portion has a slit extending in the lateral direction, and a portion sandwiching the slit at an end portion of the slit. A liquid crystal display device with a built-in touch panel, which is electrically connected to each other. The touch panel built-in type liquid crystal display device according to any one of claims 1 to 6,
Each of the plurality of openings has an outer periphery;
Of the plurality of openings, when the distance of the outer circumferences of two adjacent openings in the vertical direction is the distance between the two adjacent openings, the lateral width of the end portion is A liquid crystal display device with a built-in touch panel, which is longer than the separation distance between two adjacent openings . The touch panel built-in type liquid crystal display device according to any one of claims 1 to 8,
Each of the plurality of common wirings and the divided electrode portion are electrically connected by a connection portion. In the liquid crystal display device with a built-in touch panel according to claim 9,
The liquid crystal display device with a built-in touch panel is characterized in that the number of the connection portions increases as the length of one of the common wirings electrically connected increases. In the liquid crystal display device with a built-in touch panel according to claim 9 or 10,
The length of the connecting portion becomes longer as the length of one of the common wirings to be electrically connected is shorter. The touch panel built-in type liquid crystal display device according to any one of claims 9 to 11,
The liquid crystal display device with a built-in touch panel is characterized in that the connection portion becomes thinner as the length of one of the common wirings to be electrically connected becomes shorter. The touch panel built-in type liquid crystal display device according to any one of claims 1 to 12,
The second substrate further includes a built-in circuit;
The liquid crystal display device with a built-in touch panel, wherein the plurality of common wirings are formed so as to overlap the built-in circuit. The touch panel built-in type liquid crystal display device according to any one of claims 1 to 13,
The pixel electrode and the common electrode are formed on the second substrate,
The liquid crystal display device with a built-in touch panel, wherein the electric field formed between the pixel electrode and the common electrode is a lateral electric field.

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