JP2015191066A - liquid crystal display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display element suppressing leak light.SOLUTION: A liquid crystal display element 100 comprises a liquid crystal 30; and a first substrate 10 and a second substrate 20 which hold the liquid crystal 30 therebetween. The first substrate 10 and the second substrate 20 each includes an electrode pattern 11 which is composed of a drive electrode 12 for applying a voltage to the liquid crystal 30 and a leading wire 13 for supplying a voltage signal to the drive electrode 12. A distance between a ground pattern 14 and the leading wire 13 each provided on the first substrate 10 and on the second substrate 20 satisfies the following formula. The formula) y=0.013x+1.450, where y≥Vlcd/2 and x>100 μm are satisfied, y represents abnormal lighting voltage, and x represents inter-wire distance.

Description

  The present invention relates to a liquid crystal display element.

  Patent Document 1 discloses a liquid crystal display element in which a static electricity ground pattern is provided on the outer periphery of a liquid crystal display region in order to suppress erroneous lighting due to static electricity.

JP 2008-170812 A

  In the liquid crystal display device according to Patent Document 1, it is desirable to increase the area of the electrostatic ground pattern in order to reduce the area where the highly insulating substrate is exposed. When the area of the electrostatic ground pattern is widened, the distance between the lead wiring that supplies a voltage signal to the transparent electrode for display and the ground pattern for static electricity is reduced, so that An electric field is generated. The lateral electric field generated between the lead wiring and the electrostatic ground pattern disturbs the alignment of the liquid crystal, and thus light leakage (abnormal lighting) occurs in the liquid crystal display element.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a liquid crystal display element in which light leakage is suppressed.

In order to achieve the above object, the liquid crystal display element of the present invention comprises:
A liquid crystal display element comprising a liquid crystal, and a first substrate and a second substrate sandwiching the liquid crystal,
Each of the first substrate and the second substrate has an electrode pattern;
The electrode pattern includes a drive electrode for applying a voltage to the liquid crystal and a lead wiring for supplying a voltage signal to the drive electrode,
The distance between the ground pattern provided on at least one of the first substrate and the second substrate and the routing wiring is as follows:
Formula satisfying the following formula) y = 0.013x + 1.450
However, y ≧ Vlcd / 2 and x> 100 μm, y is an abnormal lighting voltage, and x is a distance between wirings.

  ADVANTAGE OF THE INVENTION According to this invention, the liquid crystal display element which suppressed light leakage can be provided.

1 is a diagram showing an external appearance of a liquid crystal display element according to Embodiment 1 of the present invention. The schematic sectional drawing of the AA in the liquid crystal display element shown in FIG. FIG. 2 is a schematic sectional view taken along line BB in the liquid crystal display element shown in FIG. 1. The figure which shows the relationship between the abnormal lighting voltage which concerns on Embodiment 1 of this invention, and the distance between wiring.

(Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIGS.

  FIG. 1 shows an appearance of a liquid crystal display element 100 according to the present embodiment. 2 shows an outline of the AA line cross section in FIG. 1, and FIG. 3 shows an outline of the BB line cross section in FIG.

  The liquid crystal display element 100 according to the present embodiment includes a first substrate 10 and a second substrate 20 that face each other, and a liquid crystal 30 that is sandwiched between the first substrate 10 and the second substrate 20. . The first substrate 10 and the second substrate 20 are bonded together by a seal member 40. The liquid crystal display element 100 is sandwiched between polarizing plates (not shown).

  The first substrate 10 and the second substrate 20 each have an electrode pattern 11. The electrode pattern 11 includes a drive electrode 12 that applies a voltage to the liquid crystal 30 and a lead wiring 13 that supplies a voltage signal to the drive electrode 12. The drive electrode 12 of the first substrate 10 and the drive electrode 12 of the second substrate 20 are composed of a plurality of segment electrodes or common electrodes. That is, the liquid crystal display element 100 in the present embodiment is a liquid crystal display element that performs segment display.

  The first substrate 10 and the second substrate 20 each have a ground pattern 14 that protects the liquid crystal display element 100 against static electricity. In the present embodiment, the ground pattern 14 of the first substrate 10 and the second substrate 20 causes static electricity to flow to the grounding portion. The ground pattern 14 of the first substrate 10 and the ground pattern 14 of the second substrate 20 are the electrode pattern 11 of the first substrate 10 and the electrode pattern 11 of the second substrate 20 when the liquid crystal display element 100 is viewed in plan view. It is arranged to surround

Further, the first substrate 10 and the second substrate 10 are arranged such that the ground pattern 14 and the lead wiring 13 provided on the first substrate 10 and the second substrate 10 when the liquid crystal display element 100 is viewed in plan. The distance between and satisfies the following formula.
Formula) y = 0.013x + 1.450
However, y ≧ Vlcd / 2 and x> 100 μm. y is an abnormal lighting voltage, and x is a distance between wirings. As described above, light leakage due to a lateral electric field generated between the routing wiring 13 of each substrate 10 and the ground pattern 14 of each substrate 10 can be prevented.

A specific configuration of the liquid crystal display element 100 will be described.
The first substrate 10 is made of glass, plastic or the like. The first substrate 10 has an electrode pattern 11 and a ground pattern 14 on the surface facing the second substrate 20. The electrode pattern 11 of the first substrate 10 includes a drive electrode 12 that applies a voltage to the liquid crystal 30 and a lead wiring 13 that supplies a voltage signal to the drive electrode 12. In the present embodiment, the routing wiring 13 of the first substrate 10 has an outer edge of the liquid crystal display element 100 rather than the region 50 where the driving electrode 12 of the first substrate 10 and the driving electrode 12 of the second substrate 20 overlap. Through the terminal 15 to be described later.

  The ground pattern 14 of the first substrate 10 is disposed so as to surround the electrode pattern 11 of the first substrate 10 and the electrode pattern 11 of the second substrate 20 when the liquid crystal display element 100 is viewed in plan. The ground pattern 14 of the first substrate 10 is connected to a terminal 15 described later, and causes static electricity to flow through the grounding portion.

  Further, the first substrate 10 has terminals 15 for connecting the routing wiring 13 and the ground pattern 14 in the first substrate 10 and the routing wiring 13 and the ground pattern 14 in the second substrate 20 to an external circuit (not shown). Have.

  The drive electrode 12, the routing wiring 13, and the ground pattern 14 in the first substrate 10 are made of, for example, an ITO (Indium Tin Oxide) film. The driving electrode 12, the routing wiring 13 and the ground pattern 14 on the first substrate 10 are respectively formed on the first substrate 10 by a known method (sputtering, vapor deposition, etching, etc.).

  In addition, the insulating layer 60 that covers the drive electrode 12 and the lead wiring 13 in the first substrate 10 is formed by a known method (for example, flexographic printing). The insulating layer 60 is made of, for example, silicon dioxide.

  The insulating layer 60 is provided between the electrode pattern 11 and the liquid crystal 30, is provided until the ground pattern 14 is reached, and the space between the ground pattern 14 and the lead wiring 13 is covered with the insulating layer 60.

  In addition, an alignment film 70 that covers the drive electrode 12 and the routing wiring 13 in the first substrate 10 is formed by a known method (for example, flexographic printing). The alignment film 70 is made of polyimide, for example. In the present embodiment, a vertical alignment type alignment film 70 is used as the alignment film 70. The alignment film 70 is subjected to an alignment process (for example, a rubbing process).

  The alignment film 70 is provided between the electrode pattern 11 and the liquid crystal 30 and is provided until reaching the ground pattern 14. The alignment film 70 covers the space between the ground pattern 14 and the lead wiring 13.

  Similar to the first substrate 10, the second substrate 20 is made of glass, plastic, or the like. The second substrate 20 has an electrode pattern 11 and a ground pattern 14 on the surface facing the first substrate 10.

  Similarly to the electrode pattern 11 of the first substrate 10, the electrode pattern 11 of the second substrate 20 includes a drive electrode 12 that applies a voltage to the liquid crystal 30 and a lead wiring 13 that supplies a voltage signal to the drive electrode 12. Is done. Further, the routing wiring 13 of the second substrate 20 passes through the outer edge of the liquid crystal display element 100 rather than the region 50 where the driving electrode 12 of the first substrate 10 and the driving electrode 12 of the second substrate 20 overlap with each other. 15 is connected.

  The ground pattern 14 of the second substrate 20 is disposed so as to surround the electrode pattern 11 of the first substrate 10 and the electrode pattern 11 of the second substrate 20 when the liquid crystal display element 100 is viewed in plan. The ground pattern 14 of the second substrate 20 is connected to the terminal 15 and causes static electricity to flow to the grounding portion.

  As in the case of the first substrate 10, the drive electrode 12, the lead wiring 13, and the ground pattern 14 in the second substrate 20 are made of, for example, an ITO (Indium Tin Oxide) film. The drive electrode 12, the routing wiring 13 and the ground pattern 14 on the second substrate 20 are respectively formed on the second substrate 20 by a known method (sputtering, vapor deposition, etching, etc.).

  Further, as in the case of the first substrate 10, the insulating layer 60 covering the drive electrodes 12 and the lead wirings 13 in the second substrate 20 is formed on the second substrate 20 by a known method (for example, flexographic printing). Formed by. The insulating layer 60 is made of, for example, silicon dioxide.

  The insulating layer 60 is provided between the electrode pattern 11 and the liquid crystal 30, is provided until the ground pattern 14 is reached, and the space between the ground pattern 14 and the lead wiring 13 is covered with the insulating layer 60.

  Further, similarly to the first substrate 10, a vertical alignment type alignment film 70 that covers the drive electrode 12 and the lead wiring 13 is formed on the second substrate 20, and an alignment process is performed. In the present embodiment, the alignment treatment direction (not shown) of the alignment film 70 on the first substrate 10 and the alignment treatment direction (not shown) of the alignment film 70 on the second substrate 20 are parallel in opposite directions. It is.

  The first substrate 10 and the second substrate 20 are bonded together via a seal member 40. When the first substrate 10 and the second substrate 20 are bonded together, the ground pattern 14 of the first substrate 10 and the ground pattern 14 of the second substrate 20 are electrically connected to the sealing member 40. Connected by members.

  The first substrate 10 and the second substrate 20 sandwich the liquid crystal 30. In the present embodiment, the liquid crystal 30 has negative dielectric anisotropy. Further, the liquid crystal display element 100 is sandwiched between two polarizing plates arranged in crossed Nicols. That is, in the present embodiment, the liquid crystal display element 100 is a VA (Vertical alignment) liquid crystal display element that performs display in normally black (negative).

  When the liquid crystal display element 100 is viewed in plan, a voltage is applied to the liquid crystal 30 in a region 50 where the drive electrode 12 of the first substrate 10 and the drive electrode 12 of the second substrate 20 overlap each other, and display is performed. A voltage is applied to the liquid crystal 30 from an external circuit (not shown) through the terminal 15, the lead wiring 13, and the drive electrode 12.

  Since the routing wiring 13 transmits a voltage signal to be applied to the liquid crystal 30, it is between the routing wiring 13 and the ground pattern 14 in the first substrate 10 and between the routing wiring 13 and the ground pattern 14 in the second substrate 20. Produces a transverse electric field. In addition, since the ground pattern 14 causes static electricity to flow to the ground portion via the terminal 15, when the static electricity is caused to flow to the ground portion, the second substrate is provided between the routing wiring 13 and the ground pattern 14 on the first substrate 10. In some cases, a lateral electric field is generated between the lead wiring 13 and the ground pattern 14 in FIG. These lateral electric fields disturb the alignment of the liquid crystal 30 and cause light leakage.

In the present embodiment, the first substrate 10 and the second substrate 20 are the ground patterns 14 provided on the first substrate 10 and the second substrate 10 when the liquid crystal display element 100 is viewed in plan. And the distance between the routing wiring 13 satisfies the following formula,
Formula) y = 0.013x + 1.450
However, y ≧ Vlcd / 2 and x> 100 μm. (Note that y is an abnormal lighting voltage (V), x is an inter-wiring distance (μm), and Vlcd is a liquid crystal driving voltage) The lead wiring 13 and the ground pattern 14 on the first substrate 10 In the meantime, it is possible to suppress the generation of a lateral electric field between the routing wiring 13 and the ground pattern 14 in the second substrate 20, to suppress the disturbance of the alignment of the liquid crystal 30, and to suppress light leakage.

  For example, when the liquid crystal drive voltage Vlcd is 5V, the abnormal lighting voltage y is 2.5V. Therefore, as shown in FIG. 4, when the abnormal lighting voltage y is 2.5 V, the inter-wiring distance x between the lead wiring 13 and the ground pattern 14 is (2.5-1.45) /0.013. However, since x> 100 μm, the inter-wiring distance x between the routing wiring 13 and the ground pattern 14 is 100 μm or more.

  As shown in FIG. 4, when the abnormal lighting voltage y is lower than 2.75 V, the inter-wiring distance x is set larger than 100 μm under the condition of x> 100 μm to disturb the alignment of the liquid crystal 30. This can be suppressed and light leakage can be suppressed. Moreover, when the abnormal lighting voltage y is larger than 2.75 V, by using the inter-wiring distance x obtained by the mathematical formula, the alignment of the liquid crystal 30 can be prevented from being disturbed, and light leakage can be suppressed.

  In particular, the vertical alignment type liquid crystal display element 100 is particularly effective in the vertical alignment type liquid crystal display element 100 because the alignment is affected by a small electric field.

  In the present embodiment, the insulating layer 60 provided between the electrode pattern 11 and the liquid crystal 30 is provided until reaching the ground pattern 14, and the space between the ground pattern 14 and the lead wiring 13 is covered with the insulating layer 60. Thus, it is possible to provide the liquid crystal display element 100 that suppresses the occurrence of alignment disorder due to the end of the insulating layer 60 and suppresses light leakage.

  In the present embodiment, the alignment film 70 provided between the electrode pattern 11 and the liquid crystal 30 is provided until reaching the ground pattern 14, and the ground pattern 14 and the routing wiring 13 are covered with the alignment film 70. Thus, it is possible to provide the liquid crystal display element 100 in which the occurrence of alignment disorder due to the end of the alignment film 70 is suppressed and light leakage is suppressed.

  In the above description, in order to facilitate the understanding of the present invention, the description of known unimportant technical matters is appropriately omitted.

  In the above embodiment, the segment display liquid crystal display element 100 including the segment electrode and the common electrode is used. However, the segment display liquid crystal display element 100 may be employed.

  The present invention can be used for a liquid crystal display element, and in particular, can be used for a liquid crystal display element in which an electrostatic ground pattern is provided on the outer peripheral portion of a liquid crystal display area in order to suppress erroneous lighting due to static electricity.

DESCRIPTION OF SYMBOLS 10 1st board | substrate 11 Electrode pattern 12 Drive electrode 13 Lead wiring 14 Ground pattern 20 2nd board | substrate 30 Liquid crystal 40 Sealing member 50 Area | region with which the drive electrode of a 1st board | substrate and the drive electrode of a 2nd board | substrate overlap 60 Insulating layer 70 Alignment film 100 Liquid crystal display element

Claims (3)

A liquid crystal display element comprising a liquid crystal, and a first substrate and a second substrate sandwiching the liquid crystal,
Each of the first substrate and the second substrate has an electrode pattern;
The electrode pattern includes a drive electrode for applying a voltage to the liquid crystal and a lead wiring for supplying a voltage signal to the drive electrode,
The distance between the ground pattern provided on the first substrate and the second substrate and the routing wiring is as follows:
Formula that satisfies the following formula: y = 0.013x + 1.450
However, y ≧ Vlcd / 2 and x> 100 μm,
A liquid crystal display element, wherein y is an abnormal lighting voltage and x is a distance between wirings. The insulating layer provided between the electrode pattern and the liquid crystal is provided until reaching the ground pattern, and the space between the ground pattern and the routing wiring is covered with the insulating layer. The liquid crystal display element as described. The alignment film provided between the electrode pattern and the liquid crystal is provided until reaching the ground pattern, and the space between the ground pattern and the routing wiring is covered with the alignment film. The liquid crystal display element as described.

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