JP2008033134A - Liquid crystal display element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure a necessary number of routing wirings even when a non-display area is narrow where the routing wirings spanning from a signal input terminal of a panel terminal part to a transparent electrode of a display area are passed through. <P>SOLUTION: The liquid crystal display element includes a liquid crystal cell 1A wherein one panel substrate 21 on which a first transparent electrode (for example, common electrode) 23 and a second transparent electrode (for example, segment electrode) 12 are formed, and the other panel substrate 11 are laminated via a peripheral seal member 31, and wherein a liquid crystal substance is sealed in the formed cell 1a. A panel terminal 22 is provided to a side of one panel substrate 21 in a continuous manner. First and second signal input terminals 43 and 42 respectively connected to the first and second transparent electrodes 23 and 12 via prescribed wiring routes are formed on the panel terminal part 22. In the liquid crystal display element, a part of the wiring route connecting a part of specific input terminals of the first signal input terminal 43 to specific transparent electrodes corresponding to the specific input terminals in the first transparent electrode 23 is formed on a side of the other panel substrate 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid crystal display element, and more particularly to a technique for routing wiring from a signal input terminal of a panel terminal portion to a transparent electrode in a display area.

  In the liquid crystal display element of the simple matrix drive system, the common electrode (scanning electrode) and the segment electrode (signal electrode) formed in stripes are orthogonally arranged, and the liquid crystal is sandwiched therebetween and arranged oppositely. And a predetermined image is displayed with the intersection of the common electrode and the segment electrode as a minimum pixel unit.

  The general configuration of the liquid crystal cell will be described with reference to the exploded perspective view of FIG. The liquid crystal cell 1 includes a first panel substrate 11 and a second panel substrate 21 that are made of, for example, a glass material and are disposed to face each other. In this example, a panel terminal portion 22 to which an external substrate (not shown) (in many cases, a flexible substrate) (not shown) is connected on the second panel substrate 21 side is connected to the panel substrate portion 11. May be provided.

  In this example, the segment electrode 12 is formed on the inner surface side of the first panel substrate 11, and the common electrode 23 is formed on the inner surface side of the second panel substrate 21. The segment electrode 12 and the common electrode 23 are both formed in a stripe shape by a transparent electrode material (hereinafter, also referred to as ITO material) such as ITO (Indium Tin Oxide), and are arranged so as to be orthogonal to each other.

  The first panel substrate 11 and the second panel substrate 21 are bonded to each other except for the panel terminal portion 22 via a frame-shaped peripheral sealing material 31, and a predetermined number such as TN or STN is formed in the cell 1a formed thereby. Liquid crystal material is enclosed. An alignment film or the like is provided on the inner surface of each panel substrate 11 or 21, and a polarizing film or the like is provided on the outer surface of each panel substrate 11 or 21, but description thereof is omitted here.

  In the panel terminal portion 22, a signal input terminal 42 for the segment electrode 12 and a signal input terminal 43 for the common electrode 23 are formed. The signal input terminal 42 is connected to the segment electrode 12 via the transfer portion 32 provided on the peripheral sealing material 31, and the signal input terminal 43 is drawn into the cell 1 a through the peripheral sealing material 31, and a predetermined routing wiring To the common electrode 23. Usually, the signal input terminals 42 and 43 and the lead wiring are formed of an ITO material in the electrode forming process.

  In the case of a COG (Chip On Glass) type, a bare chip 41 such as an LSI or an IC is mounted on the panel terminal unit 22 as shown in FIG. The bare chip 41 processes a liquid crystal drive signal supplied from an external substrate (not shown) and outputs a liquid crystal drive signal to the signal input terminals 42 and 43 at a predetermined timing.

  By the way, the segment electrode 12 and the common electrode 23 are provided in the display area 2 of the liquid crystal cell 1. For example, depending on the design of a not shown bezel case (exterior case of the liquid crystal display element), an original image may be displayed on the display area 2. In addition to the display main body 2a to be displayed, a background display 2b for displaying a background color in a portion adjacent to the display main body 2a may be included. Note that a space between the display region 2 and the peripheral sealing material 31 is, for example, a non-display portion that is covered with the light-shielding portion of the bezel case, and a lead wiring or the like is formed in the non-display portion.

  Thus, when the background display part 2b is included in the display area 2, a dummy electrode for applying a background display voltage to the background display part 2b is required. Therefore, in this example, on the first panel substrate 11 side, the segment electrode 12 is extended to the background display portion 2 b to form the segment side dummy electrode 13.

  On the second panel substrate 21 side, as shown in FIG. 4, the common side dummy electrode 24 is formed in the background display portion 2 b separately from the common electrode 23. For example, Patent Document 1 discloses that a background display unit is disposed adjacent to a display main body unit, and a dummy electrode for applying a background display voltage is provided on the background display unit.

JP-A-9-160065

  As described above, when the background display unit 2b is provided with the dummy electrode, it can be dealt with by extending the segment electrode 12 on the first panel substrate 11 side, but on the second panel substrate 21 side, the background display unit 2b is provided separately from the common electrode 23. Since the common-side dummy electrode 24 must be provided in this, the following problems arise.

  That is, as an example, when ten common-side dummy electrodes 24 are required, the number of routing wirings is also ten. However, due to the space limitation of the non-display area between the display area 2 and the peripheral sealing material 31, You may not be able to pass everything.

  In such a case, in the prior art, as shown in FIG. 4, for example, the common side dummy electrode lead wires are two wires 43a and 43b, and each of them is provided in the background display portion 2b with five branches. . That is, each common wiring 43a, 43b is provided with five common-side dummy electrodes 24.

  However, according to this, since the resistance values of the common electrode 23 in the display main body 2a and the common side dummy electrode 24 in the background display 2b are different, the background display The background color of 2b and the background color of the display main body 2a are not in the same display state, and the display quality is deteriorated.

  Therefore, the object of the present invention is to secure the required number of routing wires even when the non-display area through which the routing wiring from the signal input terminal of the panel terminal section to the transparent electrode of the display area is passed is narrow. It is to prevent deterioration of display quality.

  In order to solve the above-mentioned problems, the present invention is to bond one panel substrate having the first transparent electrode and the second transparent electrode facing each other on the inner surface and the other panel substrate through a peripheral sealing material. A liquid crystal cell in which a liquid crystal substance is sealed, and a panel terminal portion is connected to the one panel substrate side, and the panel terminal portion is connected to the panel terminal via a predetermined wiring path. In a liquid crystal display element in which a first signal input terminal and a second signal input terminal connected to the first transparent electrode and the second transparent electrode are formed, a specific input terminal as a part of the first signal input terminal And a part of the wiring path that connects the specific transparent electrode corresponding to the specific input terminal of the first transparent electrode is formed on the other panel substrate side.

  In the present invention, a part of the wiring path includes a first transfer portion formed on the peripheral sealing material so as to guide the specific input terminal from the one panel substrate to the other panel substrate, and one end of the wiring path. A jumper wiring portion formed on the other panel substrate so as to be connected to the first transfer portion, and the peripheral portion so as to guide the other end of the jumper wiring portion from the other panel substrate to the one panel substrate side. And a second transfer portion formed in the sealing material.

  In the present invention, the jumper wiring portion is wired in a non-display area between the display area including the second transparent electrode on the other panel substrate side and the peripheral sealing material.

  In a preferred embodiment of the present invention, the driving method is a simple matrix method, one of the first transparent electrode and the second transparent electrode is a common electrode, and the other is a segment electrode. The display area including one transparent electrode and the second transparent electrode includes a display main body that displays a predetermined image and a background display that displays a background color in a portion adjacent to the display main body. The liquid crystal display element in which the specific transparent electrode is a dummy electrode disposed in the background display unit is included.

  According to the present invention, since a part of the routing wiring from the signal input terminal of the panel terminal portion to the transparent electrode of the display area can be passed using the empty area of the other panel substrate of the other party, the routing wiring is arranged. Even if there is a space limitation in the non-display area, it is possible to secure the required number of routing wires.

  Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2, but the present invention is not limited to this. FIG. 1 is a schematic exploded perspective view showing a liquid crystal cell provided in the liquid crystal display element of the present invention, and FIG. 2 is a schematic view showing a main part of the present invention. It should be noted that the same reference numerals are used for constituent elements that do not need to be changed from those of the liquid crystal cell 1 described with reference to FIGS.

  As shown in FIG. 1, a liquid crystal cell 1A according to this embodiment includes a display main body 2a that displays an original image in a display area 2, like the liquid crystal cell 1 described in FIGS. A liquid crystal cell including a background display portion 2b that displays a background color in a portion adjacent to the display main body portion 2a, for example, a first panel substrate 11 and a second panel substrate 21 that are made of a glass material and are opposed to each other. With.

  Also in this example, a panel terminal portion 22 to which an external substrate (not shown) (in many cases, a flexible substrate) (not shown) is connected on the second panel substrate 21 side, is connected to each panel substrate 11, 21. A part may be provided.

  Also in this example, the segment electrode 12 is formed on the inner surface side of the first panel substrate 11, and the common electrode 23 is formed on the inner surface side of the second panel substrate 21. The segment electrode 12 and the common electrode 23 are both formed in a stripe shape from an ITO material, and are arranged so as to be orthogonal to each other.

  The segment electrode 12 and the common electrode 23 are arranged in the display body 2a, and the background display 2b is provided with a dummy electrode for applying a background display voltage. The segment-side dummy electrode 13 on the first panel substrate 11 side is formed by an extension of the segment electrode 12, but the common-side dummy electrode 24 on the second panel substrate 21 side is shown in FIG. As shown in FIG. 4, the electrode is formed separately from the common electrode 23 in the display main body 2a.

  The first panel substrate 11 and the second panel substrate 21 are bonded to each other except for the panel terminal portion 22 via a frame-shaped peripheral sealing material 31, and a predetermined number such as TN or STN is formed in the cell 1a formed thereby. Liquid crystal material is enclosed. Although not shown, an alignment film or the like is provided on the inner surface of each panel substrate 11 or 21, and a polarizing film or the like is provided on the outer surface of each panel substrate 11 or 21.

  The panel terminal portion 22 is formed with a signal input terminal 42 for segment electrodes and a signal input terminal 43 for common electrodes. The signal input terminal 43 for the common electrode includes a signal input terminal for the common electrode 23 and a signal input terminal for the common-side dummy electrode 24.

  Since the liquid crystal cell 1A in this example is a COG type, a bare chip 41 such as an LSI or an IC is mounted on the panel terminal portion 22. The bare chip 41 processes a liquid crystal drive signal supplied from an external substrate (not shown) and outputs a liquid crystal drive signal to the signal input terminals 42 and 43 at a predetermined timing. The signal input terminal 42 is connected to the segment electrode 12 via the transfer portion 32 provided on the peripheral sealing material 31.

  On the other hand, the signal input terminal for the common electrode 23 among the signal input terminals 43 is drawn into the cell 1a through the peripheral sealing material 31, and is connected to the common electrode 23 via a predetermined routing wire. In this embodiment, the signal input terminal for the common side dummy electrode 24 is connected to the common side dummy electrode 24 via the first panel substrate 11 (corresponding to the other panel substrate in claim 1).

  This will be described with reference to FIG. For example, if there are four signal input terminals (corresponding to the specific signal input terminal in claim 1) 431 to 434 for the common side dummy electrode 24, these signal input terminals 431 to 434 are connected to the peripheral sealing material 31. It is guided to the first panel substrate 11 side by the formed transfer part 33.

  On the inner surface side of the first panel substrate 11, jumper wirings 14 (141 to 144) corresponding to the signal input terminals 431 to 434 are formed. The jumper wirings 141 to 144 are preferably formed of an ITO material in the electrode forming process.

  The jumper wirings 141 to 144 are wired in a non-display area between the display area 2 and the peripheral sealing material 31 on the first panel substrate 11, and one end thereof is connected to the signal input terminals 431 to 434 via the transfer unit 33. The other end extends to the side of the non-panel terminal portion 22 side.

  Further, a transfer portion 34 is formed in a portion where the other end side of the jumper wirings 141 to 144 of the peripheral sealing material 31 is located, and the jumper wirings 141 to 144 are guided to the second panel substrate 21 side by the transfer portion 34. .

  On the second panel substrate 21, lead wires 431a to 434a are formed from the transfer portion 34 to the background display portion 2b and connected to the common side dummy electrode 24 in the background display portion 2b.

  Therefore, the signal input terminals 431 to 434 for the common side dummy electrode 24 are connected to the common side dummy electrode 24 via the transfer portion 33, the jumper wires 141 to 144, the transfer portion 34, and the routing wires 431a to 434a. Therefore, even when there is a space restriction in the non-display area through which the routing wiring of the second panel substrate 21 is passed, the required number of routing wirings for the common side dummy electrode 24 can be secured.

  This makes it possible to reduce the difference in resistance value between the common electrode 23 in the display main body 2a and the common side dummy electrode 24 in the background display 2b without any design difficulties. In the case of colors, the background color of the background display unit 2b and the background color of the display main body unit 2a can be set to substantially the same display state.

  In this case, since the signal input terminal 431 is connected to the routing wiring 431a, and similarly 432 is connected to 432a, 433 is connected to 433a, and 434 is connected to 434a, the signal input terminals 431 to 434 and the routing wiring 431a to Although the arrangement order of 434a is reversed, since the background display unit 2b is turned off by the background display voltage, there is no adverse effect on the background color display.

  It should be noted that the routing wirings 431a to 434a can be branched and a plurality of common-side dummy electrodes 24 can be connected to each of the wirings 431a to 434a within a range that does not adversely affect the background color display. In the above embodiment, the signal input terminal for the common side dummy electrode 24 is connected to the common side dummy electrode 24 via the substrate side of the first panel 11, but for the common electrode in the display main body 2 a. These signal input terminals may be routed to the first panel 11 substrate side.

  In contrast to the above embodiment, the present invention is applied in the same manner as described above even when the common electrode is formed on the first panel substrate 11 side and the segment electrode is formed on the second panel substrate 21 side. can do. Furthermore, the present invention can be applied even when panel terminal portions are connected to each of the first panel substrate 11 and the second panel substrate 21.

The typical disassembled perspective view which shows embodiment of the liquid crystal cell with which the liquid crystal display element of this invention is provided. The schematic diagram which shows the principal part of this invention. The typical disassembled perspective view which shows the conventional liquid crystal cell. The typical top view which shows the panel substrate by the side of the common in the said conventional liquid crystal cell.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A Liquid crystal cell 2 Display area 2a Display main-body part 2b Background display part 11 1st panel board 12 Segment electrode 13 Segment side dummy electrode 14 (141-144) Jumper wiring 21 2nd panel board 22 Panel terminal part 23 Common electrode 24 Common side Dummy electrode 31 Peripheral sealing material 32 to 34 Transfer part 41 Bare chip 42 Segment electrode signal input terminal 43 Common electrode signal input terminal 431 to 434 Common side dummy electrode signal input terminal 431a to 434a Common side dummy electrode routing wiring

Claims (4)

A liquid crystal substance is enclosed in a cell formed by bonding one panel substrate on which the first transparent electrode and the second transparent electrode facing each other are formed on the inner surface and the other panel substrate through a peripheral sealing material. A liquid crystal cell, and a panel terminal portion is continuously provided on the one panel substrate side, and the first transparent electrode and the second transparent electrode are respectively connected to the panel terminal portion via predetermined wiring paths. In a liquid crystal display element in which a first signal input terminal and a second signal input terminal connected to the liquid crystal display element are formed,
A part of a wiring path that connects a part of the specific input terminals of the first signal input terminal and a specific transparent electrode corresponding to the specific input terminal of the first transparent electrodes is formed on the other panel substrate side. The liquid crystal display element characterized by the above-mentioned.   A part of the wiring path includes a first transfer portion formed on the peripheral sealing material so as to guide the specific input terminal from the one panel substrate to the other panel substrate, and one end of the first transfer portion. A jumper wiring portion formed on the other panel substrate so as to be connected to the other panel substrate, and the other end of the jumper wiring portion is formed on the peripheral sealing material so as to guide the other panel substrate to the one panel substrate side. The liquid crystal display element according to claim 1, further comprising: a second transfer unit.   3. The jumper wiring portion is wired in a non-display area between the display area including the second transparent electrode on the other panel substrate side and the peripheral sealing material. Liquid crystal display element. The driving method is a simple matrix method, and either the first transparent electrode or the second transparent electrode is a common electrode and the other is a segment electrode, and the first transparent electrode and the second transparent electrode are connected to each other. The display area includes a display main body that displays a predetermined image, and a background display that displays a background color in a portion adjacent to the display main body, and the specific transparent electrode is included in the background display. The liquid crystal display element according to claim 1, wherein the liquid crystal display element is a dummy electrode arranged.

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