JP4356976B2 - LCD panel - Google Patents

Description

  The present invention relates to a liquid crystal display panel, and more particularly to a liquid crystal display panel having a non-display area that can be a uniform load on a rubbing roller used for rubbing treatment of an alignment film.

  Each of the two panel substrates (transparent electrode substrates) constituting the liquid crystal display panel is provided with an alignment film for aligning liquid crystal molecules in a certain direction. The alignment film is formed with fine grooves that control the alignment of liquid crystal molecules by rubbing treatment, but its quality directly affects the display, so the rubbing treatment step is an important step in the manufacturing process of liquid crystal display panels. It is considered as one of

  For the rubbing treatment, a rubbing roller around which a cloth (rubbing cloth) such as nylon or polyester is wound is generally used. However, Patent Document 1 proposes easy setting of conditions in the mass production process. Further, Patent Document 2 proposes as a method that hardly generates rubbing streaks to incline the relative movement direction of the rubbing roller and the substrate support stage by a predetermined angle with respect to the rubbing direction.

JP-A-63-240522 Japanese Patent Laid-Open No. 10-268311, FIG. 6 (b)

  However, in the actual rubbing treatment process, the rubbing roller does not move while rotating only on the alignment film formed in the display area, but also on the non-display area where the alignment film does not exist and the application portion of the peripheral sealing material. Since it moves while rotating, there is still a problem that rubbing streaks are generated.

  This will be described with reference to FIGS. FIG. 3A is a plan view schematically showing, for example, the front panel substrate 10 on the observation surface side, which is one of the two panel substrates constituting the liquid crystal display panel, and FIG. It is a top view which shows typically the rear panel board | substrate 20 by the side of the non-observation surface which is this board | substrate. In each plan view, only the right half portion from the panel center CL is shown. FIG. 3B and FIG. 4B are enlarged views of the encircled portions described in the non-display areas of the panel substrates 10 and 20.

  The front panel substrate 10 and the rear panel substrate 20 are bonded to each other through a peripheral sealing material (not shown) with their inner surfaces facing each other. In the illustrated example, the inner surface of the front panel substrate 10 is the paper surface of FIG. On the other hand, the inner surface of the rear panel substrate 20 is the front side of the paper surface of FIG. That is, it is assumed that the front panel substrate 10 is translated while being in the state of FIG. 3A and is superimposed on the rear panel substrate 20 of FIG.

  Both the front panel substrate 10 and the rear panel substrate 20 are provided with display areas 10A and 20A in the central portion (within a frame indicated by a dotted line). The liquid crystal display panel described here is a dot matrix display type. In this example, the segment electrodes 11 are formed as a group in the display area 10A of the front panel substrate 10, and the common in the display area 20A of the rear panel substrate 20. The electrodes 21 are formed as a group along a direction orthogonal to the segment electrodes 11.

  The non-display areas 10B and 20B that do not contribute to the display are the periphery of the display areas 10A and 20A, that is, between the display areas 10A and 20A and the application portion of the peripheral sealing material (not shown). For display using this non-display area A lead wire for the transparent electrode is formed. In this example, a lead-out wiring 22 connected to the common electrode 21 is formed in the non-display area 20B on the rear panel substrate 20 side.

  The routing wiring 22 is divided into, for example, two groups from the relationship with the space of the non-display area 20B. In this example, the routing wiring 22 of the common electrode 21 included in the upper half group is illustrated in the non-display area 20B. The routing wiring of the common electrode 21 included in the lower half group is formed in a non-display area (not shown) located on the opposite side to the non-display area 20B.

  A part of the pattern of the routing wiring 22 is enlarged and shown in FIG. According to this, each of the routing wirings 221, 222, 223,... Has a wide strip line portion 22a that is drawn out in parallel with the same width from the corresponding common electrode 21, and a narrow width that is bent at a right angle from the terminal. Lead portions 22b, and the respective lead portions 22b are wired in parallel to each other.

  On the other hand, when the routing wiring of the segment electrode 11 is formed in the non-display area 10B on the front panel substrate 10 side, the portion facing the routing wiring 22 of the common electrode 21 is lit, so the non-display area on the front panel substrate 10 side. A dummy electrode 12 electrically separated from the segment electrode 11 is formed on 10B.

  The dummy electrode 12 is used to make the in-plane gap uniform, and has the same pattern as the routing wiring 22 on the rear panel substrate 20 side as shown in the enlarged view of FIG. That is, it has a wide band portion 12a and a narrow lead portion 12b bent at a right angle from the end thereof, and the lead portions 12b are wired in parallel to each other.

  An alignment film (polyimide film) is formed in the display areas 10A and 20A, and a rubbing process is performed for each panel substrate. The rubbing process is performed by, for example, rotating the rubbing roller 30 having a predetermined angle with respect to the panel substrates 10 and 20 while moving the rubbing roller 30 in the arrow X direction. At this time, the rubbing roller 30 is not only on the alignment film. Also, it passes over the non-display areas 10B and 20B where the alignment film is not formed.

  When passing over the non-display areas 10B and 20B, only a portion where there is a bent portion bent at a right angle at the end of the band portions 12a and 22a (an upper portion of the non-display area) and the lead portions 12b and 22b Since the load on the rubbing roller 30 is different between the parallel portion (the lower portion of the non-display area), the rubbing roller 30 is biased in the process of repeated use.

  That is, for example, the range indicated by the double-headed arrow D that passes over the bent portion of the rubbing cloth wound around the rubbing roller 30 progresses faster than the other portions, and this causes rubbing streaks on the alignment film. There are things to do. In order to prevent this, the load on the rubbing roller 30 may be made uniform.

  One of them is to apply an alignment film over the entire inner surface of the panel substrates 10 and 20 including the non-display areas 10B and 20B and the peripheral sealing material application portion. The alignment film has adhesion to the panel substrate. This is not a preferable method because there is a possibility that a sealing failure that the sealing material for encapsulating the liquid crystal peels off together with the alignment film frequently occurs.

  Therefore, the subject of this invention is providing the liquid crystal display panel provided with the non-display area | region which can become a uniform load with respect to the rubbing roller used for the rubbing process of alignment film.

  In order to solve the above-described problem, a first invention of the present application includes a first panel substrate and a second panel substrate that are bonded to each other via a peripheral sealing material, and the first panel substrate and the second panel substrate include dots. A display region having a transparent electrode for matrix display and a non-display region existing between the display region and the peripheral sealing material, and the non-display region on the first panel substrate side includes the display region In addition, there is formed a lead-out wiring having a wide strip line portion that is led out in parallel from each of the transparent electrodes and a narrow lead portion that is bent at a right angle from the end of the strip line portion and extends in a predetermined direction. In the liquid crystal display panel in which a dummy electrode facing the routing wiring is formed in the non-display area on the second panel substrate side, the band portion of the routing wiring Is nonexistent slit electrode is characterized in that it is formed in a strip shape in the line pitch and the same pitch of the lead portion.

  In order to solve the above problem, the second invention of the present application includes a first panel substrate and a second panel substrate that are bonded to each other via a peripheral sealing material, and the first panel substrate and the second panel substrate are A display region having a transparent electrode for dot matrix display and a non-display region existing between the display region and the peripheral sealing material, and the non-display region on the first panel substrate side includes the display A lead-out wiring is formed having a wide strip line portion that is led out in parallel from each transparent electrode in the region and a narrow lead portion that is bent at a right angle from the end of the strip line portion and extends in a predetermined direction. In addition, in the liquid crystal display panel in which a dummy electrode facing the routing wiring is formed in the non-display area on the second panel substrate side, the routing wiring In the line portion, a slit having no electrode is formed in a strip shape at the same pitch as the line interval of the lead portion, and the dummy electrode on the second panel substrate side is uniform over almost the entire non-display area. It is characterized by being formed as a simple pattern.

  In the second aspect of the invention, when the dummy electrodes are formed as stripe patterns extending in parallel to each other along a predetermined direction, the slits may be disposed so as to be positioned between the lines of the stripe dummy electrodes. preferable.

  The dummy electrode only needs to be formed as a uniform pattern over almost the entire surface of the non-display area, and may be formed not only as the stripe pattern but also as a dotted island pattern. Moreover, a continuous solid pattern may be sufficient and such an aspect is also included in the present invention as a uniform pattern.

  According to the present invention, even when the rubbing roller is moved from the display area where the alignment film is formed to the non-display area where the dummy electrode is exposed, at least the lead wiring, preferably the lead wiring and the dummy electrode are not displayed. Since it is formed as a uniform pattern over almost the entire area, there is no bias in the rubbing roller wear. Therefore, no rubbing streaks are generated.

  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.

  1 (a) and 1 (b) showing the embodiment of the present invention correspond to FIGS. 3 (a) and 3 (b), and FIG. 1 (a) constitutes a liquid crystal display panel 2 of the present invention. FIG. 1B is a plan view schematically showing, for example, the front panel substrate 100 on the observation surface side which is one of the panel substrates, and FIG. 1B is shown in a non-display area of the front panel substrate 100. It is an enlarged view of a circled part.

  2 (a) and 2 (b) showing the embodiment of the present invention correspond to the previous FIGS. 4 (a) and 4 (b), and FIG. 2 (a) constitutes the liquid crystal display panel of the present invention. 2B is a plan view schematically showing the rear panel substrate 200 on the side opposite to the observation surface, which is the other substrate, and FIG. 2B is an enlarged view of the encircled portion described in the non-display area of the rear panel substrate 200. .

  As described above, the front panel substrate 100 and the rear panel substrate 200 shown as the embodiment of the present invention may have the same basic configuration as the front panel substrate 10 and the rear panel substrate 20 described in the conventional example.

  That is, the front panel substrate 100 includes a display area 10A and a non-display area 10B as a basic configuration, and for example, a segment electrode 11 that is one display electrode of dot matrix display may be formed in the display area 10A. Although not shown, an alignment film made of polyimide resin is formed in the display region 10A.

  The rear panel substrate 200 also includes a display area 20A and a non-display area 20B as a basic configuration, and the display area 20A may be formed with, for example, a common electrode 21 which is the other display electrode for dot matrix display. However, an alignment film made of polyimide resin is formed in the display region 20A.

  For both the front panel substrate 100 and the rear panel substrate 200, the rubbing roller 30 around which a cloth (rubbing cloth) such as nylon or polyester is wound is used for the rubbing process as in the conventional example. The rubbing roller 30 is prepared separately for the front panel substrate 100 and the rear panel substrate 200.

  In this embodiment, the front panel substrate 100 corresponds to the second panel substrate in claim 1, and a dummy electrode 120 is formed in the non-display region 10B. Further, the rear panel substrate 200 corresponds to the first panel substrate in claim 1, and the lead wiring 220 for the common electrode 21 is formed in the non-display area 20 </ b> B.

  In the present invention, the dummy electrode 120 on the front panel substrate 100 side and / or the routing wiring 220 on the rear panel substrate 200 side are uniform over almost the entire non-display area 10B, 20B so that the load on the rubbing roller 30 is uniform. Patterned.

  First, since the dummy electrode 120 on the front panel substrate 100 side is provided in order to make the in-plane gap uniform only in relation to the routing wiring 220 on the opposite rear panel substrate 200 side, it is not necessarily on the rear panel substrate 200 side. It is not necessary to use the same pattern as the routing wiring 220.

  Therefore, as an example, as shown in the enlarged view of FIG. 1B, the dummy electrodes 120 on the front panel substrate 100 side have a stripe pattern extending in parallel to each other. The direction is the vertical direction in this example, but it may be the horizontal direction. The line widths of the stripes are preferably the same width but may be different. For example, an S-shaped curve may be attached.

  As another example of the pattern for forming the dummy electrode 120, although not shown in the figure, an isomorphic island pattern (so-called dot pattern) that is preferably scattered evenly over almost the entire surface of the non-display area 10B can be adopted. In the case of a dot pattern, dots having different diameters may be arranged uniformly.

  In addition, a mode in which the continuous solid pattern is formed over almost the entire surface of the non-display area 10B is also included in the present invention. The above-described stripe pattern or dot pattern with less is preferred.

  Next, the routing wiring 220 on the rear panel substrate 200 side will be described with reference to the enlarged view of FIG. As in the conventional example described above, each of the routing wires 221, 222, 223,... Included in the routing wire 220 has a wide strip portion 22 a that is drawn out in parallel as the same width from the corresponding common electrode 21, and Each of the lead portions 22b is wired in parallel to each other, but in the present invention, the wide strip portion 22a is replaced with the lead portion 22b. Are formed in the band portion 22a.

  The slits 22c are portions where the electrodes are partially deleted from the band portion 22a, and the slits 22c may be formed in a strip shape so that a plurality of the slits 22c are arranged side by side at the same pitch as the line spacing of the lead portions 22b. preferable. By adopting such an arrangement, it is possible to suppress an increase in resistance value as much as possible.

  Further, in terms of the relationship with the dummy electrode 120 on the front panel substrate 100 side, when the dummy electrode 120 is formed as a stripe pattern, the slits 22c are positioned between the lines of the stripe pattern (portions where no electrode is provided). It is preferable to design.

  As described above, according to the present invention, the patterns of the dummy electrode 120 in the non-display area 10B on the front panel substrate 100 side and the routing wiring 220 in the non-display area 20B on the rear panel substrate 200 side are made uniform. Even if 30 is moved from the display areas 10A and 20A where the alignment film is formed to the non-display areas 10B and 20B where there is no alignment film, the rubbing roller 30 will not be unevenly worn.

(A) The top view which shows typically one panel board | substrate contained in the liquid crystal display panel of this invention, (b) The enlarged view which shows a part of the non-display area | region. (A) The top view which shows typically the other panel board | substrate contained in the liquid crystal display panel of this invention, (b) The enlarged view which shows a part of the non-display area | region. (A) The top view which shows typically one panel board | substrate contained in the conventional liquid crystal display panel, (b) The enlarged view which shows a part of the non-display area | region. (A) The top view which shows typically the other panel board | substrate contained in the conventional liquid crystal display panel, (b) The enlarged view which shows a part of the non-display area | region.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Front panel board | substrate 10A Display area 10B Non-display area 11 Segment electrode 120 Dummy electrode 200 Rear panel board | substrate 20A Display area 20B Non-display area 220 Lead-out wiring 22a Band part 22b Lead part 22c Slit 30 Rubbing roller

Claims (5)

The display panel includes a first panel substrate and a second panel substrate that are bonded to each other via a peripheral sealing material, the first panel substrate and the second panel substrate having a transparent electrode for dot matrix display, and the display region And a non-display area existing between the peripheral sealing material and the non-display area on the first panel substrate side has a wide width drawn in parallel from the transparent electrodes in the display area. A lead-out wiring having a narrow lead portion that is bent at a right angle from the end of the strip portion and extending in a predetermined direction is formed, and in the non-display region on the second panel substrate side In the liquid crystal display panel in which the dummy electrode facing the routing wiring is formed,
The liquid crystal display panel according to claim 1, wherein slits having no electrodes are formed in a strip shape at the same pitch as the line pitch of the lead portions in the band portion of the routing wiring. The display panel includes a first panel substrate and a second panel substrate that are bonded to each other via a peripheral sealing material, the first panel substrate and the second panel substrate having a transparent electrode for dot matrix display, and the display region And a non-display area existing between the peripheral sealing material and the non-display area on the first panel substrate side has a wide width drawn in parallel from the transparent electrodes in the display area. A lead-out wiring having a narrow lead portion that is bent at a right angle from the end of the strip portion and extending in a predetermined direction is formed, and in the non-display region on the second panel substrate side In the liquid crystal display panel in which the dummy electrode facing the routing wiring is formed,
In the strip portion of the routing wiring, slits having no electrode are formed in a strip shape with the same pitch as the line spacing of the lead portion, and the dummy electrode on the second panel substrate side is not displayed. A liquid crystal display panel, characterized in that it is formed as a uniform pattern over substantially the entire area.   3. The liquid crystal display according to claim 2, wherein the dummy electrodes are formed as stripe patterns extending in parallel to each other along a predetermined direction, and the slits are arranged so as to be positioned between lines of the stripe dummy electrodes. panel.   The liquid crystal display panel according to claim 2, wherein the dummy electrode is formed as an island pattern interspersed.   The liquid crystal display panel according to claim 2, wherein the dummy electrodes are formed as a continuous solid pattern.

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