JP4781866B2 - Liquid crystal display element - Google Patents

Description

  The present invention relates to a liquid crystal display element with improved viewing angle characteristics.

  Conventionally, as this type of liquid crystal display element, the one described in Patent Document 1 is known. As shown in FIG. 6, this liquid crystal display element is provided on a pair of substrates 1, 2 on the back side and the front side facing each other, and on both substrates 1, 2. And a pair of transparent electrodes 4 and 5 on the front side. As shown in FIG. 8, the elongated slits 6 and 7 are spaced apart in the longitudinal direction of the slits at the portions corresponding to the display areas of the transparent electrodes 4 and 5, respectively, and the back-side transparent electrode 4. A plurality of slits 6 and slits 7 of the front transparent electrode 5 are formed so as to be alternately arranged in the slit lateral direction. The reason why the slits 6 and 7 are formed at intervals in the slit longitudinal direction is to reduce the electrode resistance value by using the interval portions 6a and 7a between the slits as energization portions.

  In this case, when a voltage is applied, an oblique electric field is generated between the transparent electrodes 4 and 5 on the back side and the front side as shown by the dotted lines in FIG. To do. If the liquid crystal layer 3 is of the vertical alignment type, as shown in FIG. 7, the liquid crystal molecules 8 will fall in the opposite direction with the slits 6 and 7 as the boundary, and a so-called two-domain alignment structure can be realized. Further, if the liquid crystal layer 3 is a horizontal alignment type such as a TN type, the liquid crystal molecules rise from the opposite direction with each slit as a boundary, and also in this case, a two-domain alignment structure is realized and the viewing angle characteristics are improved. Is done.

  However, in this case, display failure is liable to occur when energization is continued for a long time in a high temperature atmosphere. FIG. 9 is a diagram showing a display defect portion of the conventional liquid crystal display element when the liquid crystal layer 3 is a TN type. In the figure, 6 'and 7' are dark portions corresponding to the slits 6 and 7, respectively. In this liquid crystal display element, a low pretilt angle alignment film is used, and the rubbing direction of the substrate on one side is opposite to the normal direction, and the liquid crystal molecules are splay aligned with respect to the thickness direction of the liquid crystal layer. The pre-tilt angle of the liquid crystal molecules in the central portion in the thickness direction is set to 0 ° so that two-domain alignment can be stably obtained.

  In the part surrounded by a circle in FIG. 9, in place of the original disclination line D1 that appears by connecting adjacent slits in the slit longitudinal direction, disclination lines connecting the edges of the slits adjacent in the slit short direction. D2 appears. The reason for this will be described with reference to FIG. 10 schematically showing the state of alignment of liquid crystal molecules in the portion connecting the gap between the slits of the rear transparent electrode and the gap between the slits of the front transparent electrode. . As shown in FIG. 10, this portion originally has a two-domain orientation of a region a1 where the liquid crystal molecules 8 rise from the right direction and a region a2 where the liquid crystal molecules 8 rise from the left direction. Then, the orientation of the liquid crystal molecules 8 continuously changes, and a disclination line D1 connecting slits adjacent in the longitudinal direction of the slit centering on a portion where the tilt angle of the liquid crystal molecules 8 in the central portion in the thickness direction is 0 ° is formed. It is formed.

  Here, if the pretilt angle θ1 with respect to the back substrate 1 and the pretilt angle θ2 with respect to the front substrate 2 are equal, the splay alignment is symmetric with respect to the liquid crystal molecules 8 having a pretilt angle of 0 ° in the center in the thickness direction. The free energy due to the elastic deformation of the liquid crystal molecules 8 in the region a1 and the region a2 becomes equal, and the disclination line D1 is stabilized without moving over time. On the other hand, when the pretilt angles θ1 and θ2 with respect to the substrates 1 and 2 on the back side and the front side are different due to a slight deviation in rubbing conditions, for example, when θ2> θ1 as shown in FIG. The free energy of the region a1 and the region a2 is not equal, and the region a2 rising to the larger pretilt angle has a smaller free energy and is more stable than the region a1. In such a state, since the liquid crystal molecular arrangement tends to transition to a more stable state, the movement of the disclination line D1 occurs as shown by the arrow in FIG. 10, and the region a1 becomes smaller with time. Eventually, the area a2 will be filled up. As a result, a display defect including the disclination line D2 connecting the edges of the slits adjacent in the slit short direction occurs. In particular, when the temperature is increased, the elastic constants of the liquid crystal molecules are reduced and the fluctuations of the liquid crystal molecules are also increased. Therefore, many such display defects are generated, and a rough feeling of display occurs due to the influence.

In order to solve this problem, Patent Document 2 also discloses a liquid crystal display element formed by shifting the slit of one transparent electrode on the back side and the front side by a half pitch in the slit longitudinal direction with respect to the slit of the other transparent electrode. Yes. In this case, each interval portion between the slits of the rear surface side transparent electrode and each interval portion between the slits of the front surface side transparent electrode are shifted from each other by a half pitch in the slit longitudinal direction, and display defects are less likely to occur. However, as a result of the test, it was found that a display defect occurred although it was rare.
JP 2004-252298 A JP 2005-43696 A

  From the above, the present invention has slits in the longitudinal direction of both transparent electrodes, and the slits of one transparent electrode and the slits of the other transparent electrode are alternately arranged in the slit short direction. A liquid crystal display element that is considered to inevitably cause a display defect in a liquid crystal display element that is formed so as to be arranged, so that even if a display defect occurs, it is difficult to visually recognize this and display quality deterioration can be prevented. The challenge is to provide

  The present invention relates to a liquid crystal display element comprising a pair of substrates disposed opposite to each other and a pair of transparent electrodes provided on both substrates and overlapping each other with a liquid crystal layer interposed therebetween to form a display region. The slits of the elongated electrodes are spaced apart in the slit longitudinal direction, and the slits of one transparent electrode and the slit of the other transparent electrode are alternately arranged in the slit short direction. In order to solve the above-mentioned problems, a plurality of items formed so as to be arranged are characterized in that the following matters are adopted. That is, according to the present invention, an array of a plurality of slits in the longitudinal direction of the slit is used as a slit row, each interval portion between slits belonging to each slit row of one transparent electrode, and adjacent to each slit row in the slit short direction. The slits of the transparent electrodes are formed so that the relative positional relationship in the slit longitudinal direction with the intervals between the slits belonging to the slit rows of the other transparent electrode is uneven.

  As a result of observing display defects occurring in various arrangements, the inventor of the present application has come to find that display defects generated in a regular arrangement increase the feeling of display roughness. In the above-mentioned Patent Document 1, each interval portion between slits belonging to each slit row of one transparent electrode and each slit row of the other transparent electrode adjacent to each slit row in the slit short direction. The relative positional relationship in the slit longitudinal direction with the respective spacing portions between the slits is the same in that the former spacing portions and the latter spacing portions are all arranged at equal intervals without any deviation in the slit longitudinal direction. Moreover, also in the thing of the said patent document 2, each space | interval part between the slits which belong to each slit row | line | column of one transparent electrode, and each of the other transparent electrode adjacent to a slit transversal direction with respect to this each slit row | line | column The relative positional relationship in the slit longitudinal direction with the respective spacing portions between the slits belonging to the slit row is uniform in that the former spacing portions and the latter spacing portions are all shifted by a half pitch in the slit longitudinal direction. For this reason, in any of the devices described in Patent Documents 1 and 2, display defects may occur in a regular arrangement at equal intervals.

  On the other hand, in the present invention, each interval portion between the slits belonging to each slit row of one transparent electrode, and the slit belonging to each slit row of the other transparent electrode adjacent to each slit row in the slit lateral direction Since the relative positional relationship in the slit longitudinal direction with each interval portion between them is uneven, even if a display failure occurs, the arrangement of display failures becomes irregular. As a result, compared with the case where display defects occur in a regular arrangement, the feeling of display roughness is reduced and display quality deterioration is suppressed. Each interval between the slits belonging to each slit row of one transparent electrode, and each interval between the slits belonging to each slit row of the other transparent electrode adjacent to each slit row in the slit short direction, That the relative positional relationship in the slit longitudinal direction is uneven means that the amount of deviation in the slit longitudinal direction between the former interval portions and the latter interval portions is at least partially different from the other portions.

  Further, the present invention provides a slit pitch that is the length of the slit plus the length of the interval between the slits, and the slit pitch of one transparent electrode of both transparent electrodes and the slit pitch of the other transparent electrode are It is different from each other.

  Here, when the slit pitch of the slit formed in each transparent electrode is the same for each transparent electrode, the slit pitch of one transparent electrode is a length that is an integral multiple of the slit pitch of the other transparent electrode, The relative positional relationship is aligned. However, since a display defect occurs starting from the edge of the slit, if the slit pitch of one transparent electrode is an integral multiple of 2 or more of the slit pitch of the other transparent electrode, the display defect that occurs The number is reduced, and deterioration of display quality is suppressed.

  If the slit pitch of one transparent electrode is set to a length other than an integer of the slit pitch of the other transparent electrode, the relative positional relationship can be made uneven, and even if a display failure occurs, a display failure occurs. The arrangement of becomes irregular and difficult to see. Moreover, as a result obtained experimentally, it is appropriate that the magnification is a value excluding an integer in the range of 1.1 times to 10 times, and more preferably 1.4 times to 5 times. Should be a value that excludes integers in the range of.

  It is also effective to form a mixture of a plurality of types of slits having different slit pitch magnifications within a predetermined range in one transparent electrode within a predetermined range. In this case, as long as it is a part of the plurality of types of slits, a slit having an integer magnification of the slit pitch with respect to the slit pitch of the other transparent electrode may be included. The predetermined range is desirably a range from 1.4 times to 5 times. In addition, as a form in which a plurality of types of slits are formed in a mixed manner, there are a form in which a plurality of types of slits are arranged in the order of the length of the slit pitch, and a form in which the slits are randomly arranged regardless of the length of the slit pitch. It is done.

  It is also effective to form a mixture of a plurality of types of slits having different slit pitches on both transparent electrodes without making all the slit pitches of the other transparent electrode the same. In this case, even if the slit pitch of some or all slits of one transparent electrode is equal to the slit pitch of some or all slits of the other transparent electrode, By arranging the slits at random regardless of the length of the slit pitch, the relative positional relationship can be made uneven. If the slit pitch of the plurality of slits of one transparent electrode is all different from the slit pitch of the plurality of slits of the other transparent electrode, the plurality of slits of each transparent electrode are arranged in the order of the length of the slit pitch. You may make it arrange.

  Hereinafter, an embodiment in which the present invention is applied to a vertical alignment type liquid crystal display element for segment display will be described. As shown in FIG. 1, the liquid crystal display element includes a glass back side substrate 1 and a glass front side substrate 2 facing the back side substrate 1, and a liquid crystal layer between the substrates 1 and 2. 3 is provided. A rear transparent electrode 4 serving as a segment electrode is provided on the rear substrate 1, and a front transparent electrode 5 serving as a common electrode is provided on the front substrate 2. Then, both transparent electrodes 4 and 5 overlap with the liquid crystal layer 3 interposed therebetween, and a display region is formed at the overlapping portion. In addition, a plurality of elongated slits 6 and 7 are formed in portions corresponding to the display areas of the transparent electrodes 4 and 5, respectively, as will be described later.

  In manufacturing the liquid crystal display element, a vertical alignment film is applied and baked on each of the substrates 1 and 2 so as to cover the transparent electrodes 4 and 5, and then a main sealant is applied to each of the substrates 1 and 2. After spraying a gap control material having a predetermined diameter, the substrates 1 and 2 are overlapped to cure the main seal material. Next, a liquid crystal layer 3 is formed by injecting liquid crystal into an empty cell between the substrates 1 and 2. The liquid crystal molecules 8 of the liquid crystal layer 3 are vertically aligned by the action of the vertical alignment film. Thereafter, the back-side polarizing plate 9 is bonded to the outside of the back-side substrate 1, and the viewing angle compensation plate 10 and the front-side polarizing plate 11 are stacked and bonded to the outside of the front-side substrate 2. Here, as shown in FIG. 2, the transmission axis 9a of the back-side polarizing plate 9 and the transmission axis 11a of the front-side polarizing plate 11 are orthogonal to each other, so that a normal black liquid crystal display element is obtained. Further, the longitudinal direction of the slits 6 and 7 is the vertical direction in FIG. 2, and is oblique to the transmission axes 9 a and 11 a of both polarizing plates 9 and 11 at an angle of 45 °.

  With reference to FIG. 3, the slit 6 shown by the solid line formed on the back surface side transparent electrode 4 and the slit 7 shown by the dotted line formed on the front surface side transparent electrode 5 are arranged at intervals in the slit longitudinal direction, respectively. In addition, the slits 6 and the slits 7 are alternately arranged in the slit lateral direction. Therefore, when a voltage is applied, an oblique electric field whose tilt direction is reversed at the slits 6 and 7 is generated (see FIG. 6), and the liquid crystal molecules 8 are tilted in the reverse direction at the slits 6 and 7 ( The so-called two-domain alignment structure is realized, and the viewing angle characteristics are improved.

  Here, the arrangement of a plurality of slits in the longitudinal direction of the slit is defined as slit rows 6L and 7L, and each interval portion 6a between the slits 6 belonging to each slit row 6L of the back-side transparent electrode 4 and a slit with respect to each slit row 6L. The relative positional relationship in the slit longitudinal direction with the spacing portions 7a between the slits 7 belonging to the slit rows 7L of the front transparent electrode 5 adjacent in the short side direction is uneven. More specifically, the slit 6 and the slit 7 have different slit pitches (the length obtained by adding the length of the interval portion between the slits to the length of the slit), and the slit 7 for each interval portion 6 a between the slits 6. The amount of shift in the slit longitudinal direction of each interval portion 7a is not constant.

  According to this, even if a display defect is formed including a disclination line connecting the edges of the slits 6 and 7 adjacent in the slit short direction, the arrangement of display defects is irregular. As a result, the feeling of display roughness is reduced compared to the case where display defects occur in a regular arrangement. In order to confirm this, various liquid crystal display elements in which the magnification of the slit pitch of the slit 7 with respect to the slit pitch of the slit 6 was changed were manufactured, and the initial display of voltage application was visually evaluated for each liquid crystal display element (initial lighting evaluation) In addition, an experiment was conducted to visually evaluate (evaluation after high-temperature energization) when energization continued for 500 hours in an atmosphere at 85 ° C., and the results shown in Table 1 below were obtained.

  In any liquid crystal display element, the vertical alignment film is SE-1211 manufactured by Nissan Chemical Industries, the thickness of the liquid crystal layer 3 is 4 μm, the liquid crystal is a liquid crystal with a birefringence of 0.15 manufactured by Merck, and the viewing angle compensation plate 10. Is a VAC-180 film manufactured by Sumitomo Chemical Co., Ltd., and the interval between the slit row 6L and the slit row 7L is 40 μm, the width of the slit 6 and the width of the slit 7 are both 20 μm, the length of the interval portion 6a of the slit 6 and the slit 7, the length of the spacing portion 7a is 20 μm, and the length of the slit 6 is 80 μm. Further, the liquid crystal display element having a magnification of 1 in Table 1 has a length of the slit 7 of 80 μm and a slit pitch of 100 μm, which is the same as the slit pitch of the slit 6, and corresponds to the conventional example shown in FIG. To do. In FIG. 3, the length of the slit 7 is 120 μm, and the magnification of the slit pitch of the slit 7 with respect to the slit pitch of the slit 6 is 1.4.

  From Table 1, compared with the magnification of 1, the magnification of other than 1, that is, the slit pitch of the slit 6 of the back side transparent electrode 4 and the slit pitch of the slit 7 of the front side transparent electrode 5 are different from each other. It can be seen that the display quality is improved. When analyzed in more detail, it can be seen that even when a magnification other than 1 is used, a magnification other than an integer has a higher effect of improving display quality than a magnification of an integer. This is because by using a magnification other than an integer, the relative positional relationship in the slit longitudinal direction between the gap 6a between the slits 6 and the gap 7a between the slits 7 becomes uneven as described above, and display defects occur. However, it is considered that the arrangement of display defects becomes irregular and is difficult to be visually recognized as a rough feeling. Accordingly, it is desirable that the magnification is a value other than an integer of 1.1 or more.

  Moreover, it can be seen from Table 1 that the display quality tends to improve as the magnification increases. This is because the display defect occurs so as to connect the edge of the slit 7 to the edge of the slit 6 adjacent to the edge of the slit 7, so that the display defect occurs as the magnification increases and the length of the slit 7 increases. It is thought that the absolute number of decreases. From the above, it is desirable that the magnification is 1.4 or more. The length of the slit 7 is limited by the size of the display area, and the length of the slit 7 cannot be increased because the number of the interval portions 7a decreases and the electrode resistance increases as the slit 7 becomes longer. Therefore, the magnification should be 10 times or less, preferably 5 times or less.

  Next, the liquid crystal display element of 2nd Embodiment is demonstrated. This liquid crystal display element is a segment display vertical alignment type liquid crystal display element similar to that of the first embodiment, and the cross-sectional structure and the directions of the transmission axes 9a and 11a of the polarizing plates 9 and 11 are the same as those in FIGS. It is. Similarly to the first embodiment, the vertical alignment film is SE-1211 manufactured by Nissan Chemical Industries, the thickness of the liquid crystal layer 3 is 4 μm, the liquid crystal is a liquid crystal with a birefringence of 0.15 manufactured by Merck, and the viewing angle compensation plate 10. Is a VAC-180 film manufactured by Sumitomo Chemical Co., Ltd., the gap between the slit row 6L and the slit row 7L is 40 μm, the width of the slit 6 and the width of the slit 7 are both 20 μm, the length of the gap 6a of the slit 6 and the slit 7 The length of the spacing portion 7a is 20 μm, and the length of the slit 6 is 80 μm.

  The difference of the second embodiment from the first embodiment is that the front side transparent electrode 5 has a plurality of kinds of different slit pitch ratios with respect to the slit pitch of the slit 6 of the rear side transparent electrode 4 as shown in FIG. The slit 7 is formed in a mixed manner. More specifically, the slit pitch of the slits 7 of the front transparent electrode 5 is randomly set within a range of 1.4 to 5 times the slit pitch (100 μm) of the slits 6 of the rear transparent electrode 4. The slits 7 having different slit pitches are randomly arranged regardless of the length of the slit pitch. Thereby, each space | interval part 6a between the slits 6 which belong to each slit row | line 6L of the back side transparent electrode 4 and each slit row | line 7L of the front side transparent electrode 5 adjacent to this slit row | line | column 6L in a slit transversal direction. The relative positional relationship in the slit longitudinal direction with the respective spacing portions 7a between the slits 7 to which it belongs becomes uneven.

  In this case, all of the slits 7 of the front transparent electrode 5 may have different slit pitches, or a certain number of 20 slits 7 having different slit pitches, and the slits 7 having different slit pitches. It is also possible to repeat this block with this arrangement as one block. In fact, since it takes a lot of man-hours in designing to make all the slits 7 different in slit pitch, the latter is preferable.

  In the second embodiment, the slits 7 having different slit pitches are randomly arranged regardless of the length of the slit pitch. However, the slits 7 may be arranged in the order of the length of the slit pitch. The slit pitch of some of the slits 7 may be an integral multiple of the slit pitch of the slit 6.

  Regarding the liquid crystal display element of the second embodiment, the display at the beginning of voltage application is visually evaluated (initial lighting evaluation), and the display when energized for 500 hours in an atmosphere of 85 ° C. is visually evaluated (after high-temperature energization) As a result of conducting an evaluation), the initial lighting evaluation was good in display quality, and the evaluation after high-temperature energization was good in display quality although there was a slight roughness.

  Next, a third embodiment will be described. This liquid crystal display element is a segment display vertical alignment type liquid crystal display element similar to that in the first and second embodiments. The cross-sectional structure and the directions of the transmission axes 9a and 11a of the polarizing plates 9 and 11 are shown in FIGS. Is the same. As in the first and second embodiments, the vertical alignment film is SE-1211 manufactured by Nissan Chemical Industries, the thickness of the liquid crystal layer 3 is 4 μm, the liquid crystal is a liquid crystal having a birefringence of 0.15 manufactured by Merck, and viewing angle compensation. The board 10 is a VAC-180 film manufactured by Sumitomo Chemical Co., Ltd., the interval between the slit row 6L and the slit row 7L is 40 μm, the width of the slit 6 and the width of the slit 7 are both 20 μm, and the length of the interval portion 6a of the slit 6 and the slit The lengths of the 7 spacing portions 7a are both 20 μm.

  In the third embodiment, as shown in FIG. 5, a plurality of types of slits 7 having different slit pitches are formed in the front side transparent electrode 5, and a plurality of types of slit pitches are also different in the rear side transparent electrode 4. The slits 6 are mixed and formed. More specifically, the slit pitch of the slits 6 and 7 of the transparent electrodes 4 and 5 on the back side and the front side is set randomly within a range from 100 μm to 400 μm, and the slits 6 and 7 having different slit pitches are set. The transparent electrodes 4 and 5 are randomly arranged regardless of the slit pitch length. Thereby, each space | interval part 6a between the slits 6 which belong to each slit row | line 6L of the back side transparent electrode 4 and each slit row | line 7L of the front side transparent electrode 5 adjacent to this slit row | line | column 6L in a slit transversal direction. The relative positional relationship in the slit longitudinal direction with the respective spacing portions 7a between the slits 7 to which it belongs becomes uneven.

  In this case, all of the slits 6 and 7 may have different slit pitches, and a certain number of 20 slits 6 and 7 having different slit pitches, and these slit pitches 6 and 7 having different slit pitches. It is also possible to repeat this block with this arrangement as one block. In fact, it takes a lot of man-hours in designing to make all the slits 6 and 7 have different slit pitches, so the latter is preferable.

  The slit pitch of some or all of the slits 6 of the plurality of types of slits 6 having different slit pitches of the back side transparent electrode 4 is one of the slit pitches of the plurality of types of slits 7 of which the slit pitch of the front side transparent electrode 5 is different. Even if it is equal to the slit pitch of a part or the whole, these plural types of slits 6 and 7 are randomly arranged regardless of the length of the slit pitch, or the slit 6 of the back surface side transparent electrode 4 has a short slit pitch or By arranging the slits 7 of the front transparent electrode 5 in order from the longest one and arranging the slits 7 in the order from the longest or shortest slit pitch, the relative positional relationship can be made uneven. Further, when the slit pitches of the plurality of types of slits 6 of the back surface side transparent electrode 4 are all different from the slit pitches of the plurality of types of slits 7 of the front surface side transparent electrode 5, the plurality of types of slits 6, 6 of each transparent electrode 4,5. 7 may be arranged in the order of the length of the slit pitch.

  For the liquid crystal display element of the third embodiment, the initial display of voltage application is visually evaluated (initial lighting evaluation), and the display when the current is continued for 500 hours in an atmosphere of 85 ° C. is visually evaluated (after high-temperature power supply) As a result of conducting an evaluation), the initial lighting evaluation was good in display quality, and the evaluation after high-temperature energization was good in display quality although there was a slight roughness.

  In addition, when a plurality of types of slits 6 and 7 having different slit pitches are mixed and formed as in the second and third embodiments, the resistance value is sufficient for the display region where the length in the slit longitudinal direction is the shortest. If the maximum slit pitch is determined so as to be reduced, the transparent electrodes 4 and 5 can be designed without enormous man-hours such as examining the slit pitch for each display region and examining the resistance value.

  In general, the length of the transparent electrode in the slit longitudinal direction is longer in the front transparent electrode 5 serving as the common electrode than in the rear transparent electrode 4 serving as the segment electrode. Accordingly, when the transparent electrode forming the plurality of types of slits having different slit pitches is only one transparent electrode, the front-side transparent electrode (common electrode) 5 is used as the one transparent electrode as in the second embodiment. It is desirable to choose.

  The embodiment in which the present invention is applied to the segment display vertical alignment type liquid crystal display element has been described above. However, the present invention can also be applied to a dot matrix display liquid crystal display element and a horizontal alignment type liquid crystal display element such as a TN type. . Further, the present invention can also be applied to an active matrix type liquid crystal display element using a switching element such as a TFT, in which an off voltage is set to be higher than a voltage at which liquid crystal molecules start to move.

1 is a schematic cross-sectional view of a liquid crystal display element according to a first embodiment of the present invention. Explanatory drawing which shows the direction of the transmission axis of the polarizing plate of the liquid crystal display element of 1st Embodiment. Explanatory drawing which shows the arrangement | sequence of the slit of the liquid crystal display element of 1st Embodiment. Explanatory drawing which shows the arrangement | sequence of the slit of the liquid crystal display element of 2nd Embodiment. Explanatory drawing which shows the arrangement | sequence of the slit of the liquid crystal display element of 3rd Embodiment. Sectional drawing which shows the generation | occurrence | production state of an oblique electric field. Explanatory drawing which shows the behavior of the liquid crystal molecule by an oblique electric field. Explanatory drawing which shows the arrangement | sequence of the slit of a prior art example. The figure which shows the part of a display defect. Explanatory drawing which shows the orientation of the liquid crystal molecule in the AA line cutting | disconnection part of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Back side substrate, 2 ... Front side substrate, 3 ... Liquid crystal layer, 4 ... Back side transparent electrode, 5 ... Front side transparent electrode, 6 ... Back side transparent electrode slit, 7 ... Front side transparent electrode slit, 6L , 7L... Slit rows, 6a, 7a.

Claims (8)

A liquid crystal display element comprising a pair of substrates disposed opposite to each other and a pair of transparent electrodes provided on both substrates and forming a display region so as to overlap each other with a liquid crystal layer interposed therebetween. The elongated slits are spaced apart in the slit longitudinal direction, and the slits of one transparent electrode and the slit of the other transparent electrode are alternately arranged in the slit short direction in the matching portions. In a plurality formed in
An array of a plurality of slits in the longitudinal direction of the slit is used as a slit row, each interval between slits belonging to each slit row of one transparent electrode, and the other transparent electrode adjacent to each slit row in the slit short direction. A liquid crystal display element, wherein the slits of the transparent electrodes are formed so that the relative positional relationship in the longitudinal direction of the slits with the intervals between the slits belonging to each slit row is uneven. A liquid crystal display element comprising a pair of substrates disposed opposite to each other and a pair of transparent electrodes provided on both substrates and forming a display region so as to overlap each other with a liquid crystal layer interposed therebetween. The elongated slits are spaced apart in the slit longitudinal direction, and the slits of one transparent electrode and the slit of the other transparent electrode are alternately arranged in the slit short direction in the matching portions. In a plurality formed in
The length obtained by adding the length of the interval between the slits to the length of the slit as a slit pitch, the slit pitch of one transparent electrode of both transparent electrodes and the slit pitch of the other transparent electrode are different from each other, Liquid crystal display element.   3. The liquid crystal display element according to claim 2, wherein the slit pitch of one of the transparent electrodes is set to a length other than an integer of the slit pitch of the other transparent electrode.   4. The liquid crystal display element according to claim 3, wherein the magnification is a value excluding an integer in a range from 1.1 times to 10 times.   5. The liquid crystal display element according to claim 4, wherein the magnification is a value excluding an integer within a range of 1.4 to 5 times.   A length obtained by adding the length of the interval between the slits to the length in the longitudinal direction of the slit is defined as a slit pitch, and one of the transparent electrodes has a slit pitch with respect to the slit pitch of the other transparent electrode. 2. The liquid crystal display element according to claim 1, wherein a plurality of types of slits having different magnifications within a predetermined range are mixedly formed.   The liquid crystal display element according to claim 6, wherein the predetermined range is a range of 1.4 to 5 times.   The length obtained by adding the length of the gap between the slits to the length in the longitudinal direction of the slits is defined as a slit pitch, and a plurality of types of slits having different slit pitches are formed on both transparent electrodes. The liquid crystal display element according to claim 1.

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