CN101989011B - Liquid crystal display element - Google Patents
Liquid crystal display element Download PDFInfo
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- CN101989011B CN101989011B CN201010242544.0A CN201010242544A CN101989011B CN 101989011 B CN101989011 B CN 101989011B CN 201010242544 A CN201010242544 A CN 201010242544A CN 101989011 B CN101989011 B CN 101989011B
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Abstract
The present invention provides a liquid crystal display element. For realizing display uniformity in a vertical alignment liquid crystal display element, the vertical alignment liquid crystal display element comprises the following components: a pair of transparent substrates which are oppositely configured with a preset interval; a plurality of first transparent electrodes which are provided at one surface side of the transparent substrate; a plurality of second transparent electrodes which extend in direction which is orthogonal with the first transparent electrodes and are formed at the other surface side of the transparent substrate; single domain vertical alignment films which are formed at the opposite surface side of the transparent substrate and undergoes single domain vertical alignment treatment for aiming at least one opposite surface with a mode of parallel with a length direction of the first transparent electrode; a crystal alignment liquid crystal layer which is clamped by a pair of substrates and is provided with a pretilt angle; and a pair of polarizing plates which is configured with a mode of clamping the pair of substrates, wherein, each cross part between the first transparent electrode and the second transparent electrode is provided with a hexagonal pixel which comprises an edge that is at an angle of 0 DEG+/-10DEG or 90DEG+/-10DEG to at least one in the absorbing axis of the pair of polarizing plates.
Description
Technical field
The present invention relates to liquid crystal display cells.
Background technology
About the vertical orientation type liquid crystal display cells of the liquid crystal molecule in liquid crystal layer relative to substrate vertical orientation, when not applying voltage, black level is very good, by importing in the one-sided of liquid crystal cells or both sides the negative optically anisotropic optical compensation plate having and keep suitable parameter up and down between Polarizer, possesses extraordinary viewing angle characteristic (for example, referring to patent documentation 1) thus.
In recent years, for vertical orientation type liquid crystal display cells, even if also obtain good viewing angle characteristic in order to not only obtain the viewing angle characteristic shown slinkingly when showing in bright display, to employ in a pixel LCD alignment direction in a large number towards " the multiple domain orientation " of multiple directions.Such as, propose and be provided with peristome to produce tilting electric field to control the multiple domain orientation of orientation (such as in pixel electrode, with reference to patent documentation 2) and pop-up structure is set in pixel electrode utilizes dip plane to control the multiple domain orientation (for example, referring to patent documentation 3) etc. of orientation.Such as, but when arranging the above-mentioned electrode structure for generation of tilting electric field or arranging pop-up structure at substrate surface, in 1 pixel of dot matrix display part, aperture opening ratio reduces, the transmitance of liquid crystal display cells reduces.
On the other hand, when only paying attention to the viewing angle characteristic in orientation, left and right of liquid crystal indicator, can not be multiple domain orientation as above, but on whole liquid crystal display cells, implement the single domain orientation of uniform orientation process.By the so-called light orientation process for vertical orientation film (such as, with reference to patent documentation 4) or for have the free energy of particular surface vertical orientation film rubbing treatment method (such as, with reference to patent documentation 5), carry out uniform orientation process.
Single domain vertical orientation type liquid crystal display cells is controlled to no matter whether be applied with voltage by orientation, and the orientation state in liquid crystal layer is all identical.Abruptness in electro-optical characteristic also depends on the tilt angle in liquid crystal layer to a great extent, finds to have more then better close to 90 degree tendency.Now, in order to prevent orientation defect when applying voltage, even if also need when not applying voltage to give tilt angle, to make liquid crystal molecule relative to substrate from vertically tilting slightly.
In addition, for vertical orientation type liquid crystal display cells, in order to realize transmitance when good ON shows under high duty ratio (Duty) drive condition more than 1/32 and realize high-contrast, effective mode carries out adjusting making compared with the low duty ratio drive condition of less than 1/4, set delay Δ nd (the Δ n: the complex index of refraction of liquid crystal material in liquid crystal layer significantly, d: liquid crystal thickness), become good to make the abruptness in electro-optical characteristic.
In addition, driving method is divided into the active matrix and simple matrix that use the active components such as TFT.There is the alphanumeric display of display 7 sections or any mark etc. in simple matrix and utilize transverse and longitudinal electrode to carry out a dot-matrix display for display.In dot-matrix display, carry out ON/OFF display by applying voltage waveform to the scan electrode of transverse direction and the signal electrode of longitudinal direction.Also be called that multiple driving or dutycycle drive.Voltage waveform now, by arbitrary dutycycle and biased than determining, can use optimum offsetting, selecting the Active Addressing method of all scan electrodes simultaneously, the multi-thread back-and-forth method simultaneously selecting multiple scan electrode or multi-line addressing method.In addition, usually scan electrode is selected successively in one direction.From the display data RAM in driving circuit, read in displaying contents, via the segment driver be connected with signal electrode and the common driver be connected with scan electrode, drive successively by picture ground.
Figure 17 is the general profile chart of the example representing existing vertical orientation type liquid crystal display cells.In addition, be Figure 18 straight line X-Y between cut-open view.
1st substrate (upper board) 1 is relative with the 2nd substrate (lower board) 2, is clamped with liquid crystal layer 3 therebetween.1st substrate 1 is such substrate: on the apparent surface of transparency carrier 13, be formed with transparency electrode (segment electrode) 14, this transparency electrode 14 applies vertical orientation film 15 and along the direction shown in 18, friction treatment is carried out to the surface of this vertical orientation film 15, outer surface is configured with viewing angle compensation plate 12 and Polarizer 11.2nd substrate 2 is same with the 1st substrate 1, the apparent surface of transparency carrier 23 is formed transparency electrode (public electrode) 24, covers the surface of this transparency electrode 24 with vertical orientation film 25, and friction treatment is carried out in the direction along arrow 28.Outer surface is configured with viewing angle compensation plate 22 and Polarizer 21.Liquid crystal layer 3 comprises the liquid crystal molecule had with the character of the face vertical orientation of substrate 1,2, and by friction treatment 18,28, this liquid crystal layer 3 has the pre-tilt of angled relative to the normal direction of substrate (in this instance, being roughly 89.9 °).Backlight 4 and light source 5 is configured with in the below of lower board 2.
Figure 18 is the general view that the transparency electrode (segment electrode) 14 of Figure 17 and the electrode pattern of transparency electrode (public electrode) 24 are shown.This planimetric map is the figure of the liquid crystal display cells observing Figure 17 from normal direction.In addition, the label identical with Figure 17 represents same parts, so the description thereof will be omitted.
In figure 18, side electrode is the segment electrode 14 orientation at 6 o'clock to 12 o'clock with slender electrode shape, and lower lateral electrode is the public electrode 24 on its orthogonal directions with slender electrode shape.The region of the quadrilateral that segment electrode 14 intersects with public electrode 24 forms 1 pixel.
Only show several slender electrode in figure 18, but in fact lower board 2 have 64 public electrodes 24 in element.Electrode width is set to 0.46mm, and interelectrode distance is set to 0.015mm.Friction orientation is 12 orientation roughly orthogonal relative to the length orientation of slender electrode.On the other hand, in upper board 1, elongated segment electrode 14 configures in the mode of length orientation relative to the upper and lower bit parallel of element, and number of poles is 128.Electrode width is set to 0.46mm, and interelectrode distance is set to 0.015mm.Friction orientation is 6 orientation almost parallel relative to the length orientation of slender electrode.Therefore, the part in the 0.46mm four directions of upper and lower slender electrode intersection forms 1 pixel.
According to the position relation that liquid crystal layer central molecule is swung to when applying voltage, optimum visual identification direction is 6 orientation.On the other hand, when the observation polar angle angle that change is benchmark with element normal direction, there is the dimmed angle being difficult to visual identity of bright display in its opposite orientation (anti-visual identity direction).
[patent documentation 1] Japanese Laid-Open Patent Publication 62-210423 publication
[patent documentation 2] Japanese Unexamined Patent Publication 2005-252298 publication
[patent documentation 3] Japanese Unexamined Patent Publication 11-242225 publication
[patent documentation 4] Japanese Unexamined Patent Publication 09-211468 publication
[patent documentation 5] Japanese Unexamined Patent Publication 2005-234254 publication
Existing vertical orientation type liquid crystal display cells shown in Figure 17 uses length of delay Δ nd be set as the liquid crystal material of about 900nm and make, for in 1/64 dutycycle, the driving voltage of maximum-contrast is obtained under 1/9 biased drive condition, when observing the outward appearance of liquid crystal display cells, even if change in optimum visual identification orientation and orientation, element left and right and observe polar angle angle, whole dot matrix display part also realizes showing state uniformly, on the other hand, clockwise centered by anti-visual identity orientation, be rotated counterclockwise the scope about 70 ° of orientation, show uniformity is insufficient, especially observing from anti-visual identity orientation, sometimes shape at random is felt, display quality significantly reduces.
In addition, also there is following problem: 4 limits of each pixel edge are 45 ° ± about 10 ° relative to upper and lower Polarizer absorption axle in dot matrix display part, due to the impact of tilting electric field produced near pixel edge, compared with inner with pixel at the near threshold voltage of liquid crystal layer, the inclination of the liquid crystal molecule of adjacent edges becomes large and produces light leak, bring impact therefore to the abruptness of the Near Threshold of electro-optical characteristic, especially in simple matrix drives, cause transmitance during OFF voltage to rise, become the reason that contrast reduces.
Summary of the invention
The object of the present invention is to provide a kind of vertical orientation type liquid crystal display cells realizing show uniformity.
In addition, another object of the present invention is to provide following vertical orientation type liquid crystal display cells, this vertical orientation type liquid crystal display cells has the electrode structure suppressed the light leak of the pixel adjacent edges when applying the voltage of near threshold voltage.
According to an aspect of the present invention, liquid crystal display cells has: a pair transparency carrier, and it is oppositely disposed at predetermined intervals; Multiple 1st transparency electrode, it is formed at an opposite face side of above-mentioned transparency carrier; Multiple 2nd transparency electrode, it, in the mode extended on the direction orthogonal with above-mentioned 1st transparency electrode, is formed at another opposite face side of above-mentioned transparency carrier; Single domain vertical orientation film, it is formed at each opposite face side of above-mentioned transparency carrier, at least one party of this single domain vertical orientation film, has carried out the process of single domain vertical orientation in the mode parallel with the length direction of above-mentioned 1st transparency electrode; The liquid crystal layer of vertical alignment mode, it is clamped by above-mentioned a pair transparency carrier, has tilt angle; And a pair Polarizer, it configures in the mode clamping above-mentioned a pair transparency carrier, wherein, at each cross section of above-mentioned 1st transparency electrode and above-mentioned 2nd transparency electrode, form hexagonal pixels, this hexagonal pixels comprises and the limit of at least one angle formed in the absorption axle of above-mentioned a pair Polarizer within the scope of 0 ° ± 10 ° or 90 ° ± 10 °.
According to the present invention, show uniformity can be realized in vertical orientation type liquid crystal display cells.
In addition, according to the present invention, a kind of vertical orientation type liquid crystal display cells had the electrode structure that the light leak of the pixel adjacent edges when applying the voltage of near threshold voltage suppresses can be provided.
Accompanying drawing explanation
Fig. 1 is the general profile chart of the structure of the liquid crystal display cells 100 that the present invention the 1st embodiment is shown.
Fig. 2 is the general view that the segment electrode 34 of the present invention the 1st embodiment and the electrode pattern of public electrode 24 are shown.
Fig. 3 is the prediction concept map to liquid crystal layer central molecule director distribution when being applied with the voltage of more than threshold voltage between segment electrode 34 and public electrode 24 in the electrode structure of the 1st embodiment shown in Fig. 2 and LCD alignment structure.
Fig. 4 is the general view with an example of the electrode pattern of peristome 34a that the present invention the 1st embodiment is shown.
Fig. 5 is the general view with an example of the electrode pattern of peristome 34b that the present invention the 1st embodiment is shown.
Fig. 6 is the general view of electrode pattern A1 ~ A3 that the 1st embodiment is shown.
Fig. 7 is the general view of electrode pattern B1 ~ B3 that the 1st embodiment is shown.
Orientation macrograph when Fig. 8 is the front observation of the liquid crystal display cells 100 of the present invention the 1st embodiment.
Fig. 9 is that photo is observed in the front of the liquid crystal display cells 100 of the present invention the 1st embodiment.
Orientation macrograph when Figure 10 is the front observation of the pixel edge 9B of the pixel 9 of the electrode structure shown in Fig. 2 and the orientation tissue at 9C place.
Figure 11 is the general view that the segment electrode 54 of the present invention the 2nd embodiment and the electrode pattern of public electrode 44 are shown.
Figure 12 is the prediction concept map to liquid crystal layer central molecule director distribution when being applied with the voltage of more than threshold voltage between segment electrode 54 and public electrode 44 in the electrode structure of the 2nd embodiment shown in Figure 11 and LCD alignment structure.
Figure 13 is that photo is observed in the front of the orientation tissue at the pixel edge 9D place of Figure 11.
Figure 14 is the general view that the segment electrode 74 of the present invention the 3rd embodiment and the electrode pattern of public electrode 64 are shown.
Figure 15 is the prediction concept map to liquid crystal layer central molecule director distribution when being applied with the voltage of more than threshold voltage between segment electrode 74 and public electrode 64 in the electrode structure of the 3rd embodiment shown in Figure 14 and LCD alignment structure.
Figure 16 illustrates the segment electrode of variation of the present invention the 3rd embodiment and the general view of the electrode pattern of public electrode.
Figure 17 is the general profile chart of the example that existing vertical orientation type liquid crystal display cells is shown.
Figure 18 is the general view of the dot matrix electrode pattern that existing vertical orientation type liquid crystal display cells is shown.
Figure 19 is that photo is observed in the front of orientation state when illustrating that the electrode pattern shown in Figure 18 and electrode structure apply forward voltage in alignment direction.
Figure 20 is the concept map of the liquid crystal director distribution in 1 pixel when illustrating that the electrode pattern shown in Figure 18 and electrode structure apply forward voltage in alignment direction.
Symbol description
1,2 ... substrate, 3 ... liquid crystal layer, 4 ... backlight, 5 ... light source, 11,12 ... Polarizer, 13,23 ... viewing angle compensation plate, 14,34,54,74,94 ... segment electrode, 24,44,64,84 ... public electrode, 15,25 ... vertical orientation film, 18,28 ... frictional direction
Embodiment
The present inventor produces the reason of display unevenness when observing liquid crystal display cells from anti-visual identity orientation for prior art analysis, find that its reason is the tilting electric field produced between electrode.
As shown in figure 17, the usually known edge being positioned at the electrode pattern between 2 pieces of substrates produces tilting electric field, especially when vertical orientation type liquid crystal display cells, is easily subject to its impact.
Negative type liquid crystal for vertical orientation type liquid crystal display cells swings to the direction vertical relative to the electric field line of electric field.Also swing in the same way in the tilting electric field that the edge of electrode pattern produces.Because the electric field expanded under the side of segment electrode 14 produces, so liquid crystal molecule (director) swings to outside.Equally, produce the electric field expanded at the side of public electrode 24, liquid crystal molecule (director) swings to inner side.Therefore, when the liquid crystal director caused by the tilting electric field produced at electrode pattern edge is positioned at different directions with the liquid crystal director caused by orientation process, the border, territory of black line shape is recognized in its boundary portion.
Figure 19 be the electrode pattern shown in Figure 18 and electrode structure tilt angle is set as 89.95 ° in alignment direction front when applying ON voltage observe photo.White region is considered to represent that the liquid crystal molecule of vertical orientation swings to alignment direction, by intersecting Polarizer that Niccol (Network ロ ス ニ コ Le) the configures region through light.The black region of white region periphery is considered to represent not yet through the region of light, thinks that the orientation of liquid crystal molecule is upset.
As shown in figure 19, for 1 pixel of square shape, beyond the dark areas of the electric interelectrode portion around pixel, the left and right of pixel and above the periphery on these 3 limits observe dark areas.Further, there is odd number intersection point (point of crossing) CP in dark areas in known on top periphery.With reference to Figure 20, the reason producing this black line (black intersection BC) is described.
Figure 20 is the concept map of liquid crystal director distribution when representing that the electrode pattern shown in Figure 18 and electrode structure apply forward voltage in alignment direction in 1 pixel.
Can think centre portion within the pixel, liquid crystal molecule swings to upper direction in figure according to the orientation process of above-below direction, is delayed and through light.Can think at left and right side, due to the Overlay between the fringe field of transverse direction and the orientation process of above-below direction, liquid crystal molecule swings to vergence direction, produces the component consistent with the absorption direction of principal axis of Polarizer, maintains shading status.
About the liquid crystal director in the pixel center portion represented with the arrow being applied with shade, because there is not tilting electric field, so be defined as 12 directions by the frictional direction of upper board 1 and these two substrates of lower board 2.The liquid crystal director in the pixel edge portion represented by white arrow is determined by the impact of tilting electric field.Liquid crystal layer 3 represents the character of non-individual body, so from central part to left and right edges portion, and liquid crystal director continuous rotation 90 degree.Carry out simply to it in the drawings, with the arrow of blacking, center section is expressed as the liquid crystal director of inclination 45 degree.In addition, for the limit 7 of pixel upper part (figure divides middle and upper part), the liquid crystal director in pixel center portion and the liquid crystal director in pixel edge portion are in the relation of reversion, so there is region (borderline region) and discontinuity zone that two liquid crystal directors revolve turnback.
In such a state, as shown in the figure, instantly when lateral deviation tabula rasa absorption axle and upside Polarizer absorption axle are configured to ± 45 degree relative to the frictional direction of two substrates, the borderline region of the liquid crystal director reversion of the liquid crystal director region represented with blacking arrow and the central part of pixel upper part and edge part becomes that to absorb axle with Polarizer parallel or substantially parallel, therefore do not obtain bright state, and observe black line.
Discontinuity zone is presumed to, even if apply voltage liquid crystal also remain vertical.Discontinuity zone is the point of crossing CP of above-mentioned black line, here, is considered to because whether liquid crystal molecule applies voltage and do not tilt, so form the dark areas of point-like.In this manual, this black line region is called " black intersection ".
Produce black to intersect the reason of BC and be considered to: it is parallel and close to parallel that the orientation orientation of liquid crystal molecule absorbs axle relative to Polarizer, or no matter whether apply voltage, liquid crystal molecule is all substantially vertical relative to substrate.
In Figure 19, when observe the black near upper edge intersect BC time, observe point of crossing CP, observe the quantity of point of crossing CP and position for each pixel different phenomenons.The black thinking due to each pixel intersects the position of point of crossing CP of BC and the difference of quantity, the area ratio in the region that the orientation orientation of adjacent edges is different changes, and this can be defined as being the reason showing unevenness when liquid crystal display is observed in anti-visual identity direction.
On anti-visual identity direction, the transmitance in known pixel center portion is low, only transmits pixel edge portion.The permeation parts of this edge part be when observing from front (such as, black intersection region BC Figure 19), when changing visual identity direction clockwise and counterclockwise from anti-visual identity direction, the liquid crystal director distribution of black intersection region BC can bring impact.As mentioned above, because the position of intersecting point of black intersection BC is different for each pixel with number, so can think that the liquid crystal director distributed pins of black intersection region BC is different to each pixel.Here, suppose that the liquid crystal director distribution of black intersection region BC is formed by roughly right 45 degree and left 45 degree, because point of crossing CP is different for each pixel, so the size (area) predicting right 45 degree of regions and left 45 degree of regions is also different.In this situation, transmitance when changing visual angle clockwise from anti-visual identity direction is different from the transmitance in time changing visual angle counterclockwise, when observing multiple pixel or whole picture, observes shape at random, show uniformity deterioration, becomes the liquid crystal display cells that display quality is low.
The present inventor thinks that the reason of display unevenness is, for each pixel, it is scattered and be not fixed that above-mentioned black intersects the generation position of BC and quantity, therefore infer that solving this problem effective method is, (1) makes near upper edge, do not produce black intersection BC itself; (2) make black intersection BC even in each pixel.
On the other hand, inferring the method as the light leak eliminating the pixel adjacent edges when applying the voltage of near threshold voltage, the most effectively adopting pixel edge to absorb the almost parallel or orthogonal such liquid crystal display cells structure of axle relative to upper and lower Polarizer.
Fig. 1 is the general profile chart of the structure of the liquid crystal display cells 100 representing the present invention the 1st embodiment.Liquid crystal display cells 100 is the single domain vertical orientation type liquid crystal display cells with rectangular dot matrix electrode pattern.
Segment electrode substrate (upper board) 1 is relative with common electrode substrate (lower board) 2, is clamped with liquid crystal layer 3 betwixt.Segment electrode substrate 1 is such substrate: be formed with transparency electrode (segment electrode) 34 the apparent surface of transparency carrier 13, this transparency electrode 34 applies vertical orientation film 15, with the direction shown in 18, friction treatment is being carried out to the surface of this vertical orientation film 15.The outer surface of segment electrode substrate 1 is configured with viewing angle compensation plate 12 and Polarizer 11.
Common electrode substrate 2 is same with segment electrode substrate 1, such substrate: be formed with transparency electrode (public electrode) 24 the apparent surface of transparency carrier 23, utilize vertical orientation film 25 to cover the surface of this transparency electrode 24, carry out friction treatment in the direction of arrow 28.Viewing angle compensation plate 22 and Polarizer 21 is configured with at the outer surface of common electrode substrate 2.
Liquid crystal layer 3 comprises the liquid crystal molecule of the character of the face vertical orientation had relative to substrate 1,2, by orientation process, has the pre-tilt angled relative to the normal direction of substrate.Backlight 4 and light source 5 is configured with in the below of lower board 2.In addition, between the transparency electrode 34 and vertical orientation film 15 of substrate 1 and between the transparency electrode 24 of substrate 2 and vertical orientation film 25, the dielectric film etc. preventing short circuit between substrate can also be formed.
Segment electrode 34 is formed by transparency electrode ITO, line width 460 μm, between line 15 μm, is made up of 128 wire electrodes.
Public electrode 24 is formed by transparency electrode ITO, line width 460 μm, between line 15 μm, is made up of 64 wire electrodes.
Such as, each substrate passes through CVD, evaporation, sputtering etc. with 500
thickness forms indium tin oxide (ITO) film as hyaline membrane, carries out shaping by photoetching.In addition, segment electrode 34 is provided with the peristome 34a as shown in aftermentioned Fig. 3.In addition, as the 1st embodiment, use Fig. 6 (A) ~ (C) and the electrode pattern A1 ~ A3 shown in Fig. 7 (A) ~ (C) and B1 ~ B3 to arrange peristome 34a1 ~ 34a3 and 34b1 ~ 34b3, actual fabrication becomes liquid crystal display cells.Each electrode pattern is described in detail referring to Fig. 6 and Fig. 7.
Being formed with the substrate 2 of transparency electrode 24 and being formed with on the substrate 2 of transparency electrode 34, after forming vertical orientation film in the mode of flexo, carry out roasting, wait process to give tilt angle to this film by friction.In addition, in the 1st embodiment, for the electrode pattern A1 ~ A3 shown in Fig. 6 (A) ~ (C) and Fig. 7 (A) ~ (C) and B1 ~ B3, respectively tilt angle is set as 89.95 °, makes the liquid crystal display cells 100 amounting to 6 kinds.
The pre-dumping direction of segment electrode substrate (upper board) 1 is set to 6 directions (when the right side being set to 0 degree, be rotated counterclockwise the position of 90 degree, be left direction in FIG) antiparallel orientation, the azimuthal direction of pre-dumping of common electrode substrate (lower board) 1 is set to 12 directions (when the right side being set to 0 degree, the position that dextrorotation turn 90 degrees is right direction in FIG) antiparallel orientation.In addition, as long as realize same orientation process in pixel, no matter use what rubbing treatment method.Such as, can use the inclination evaporation of vertical orientation film irradiation ultraviolet radiation, metal oxide and the orientation method etc. employing sputtered film.In addition, only friction treatment can be implemented to any one party of substrate 1 and 2.
By interspersing among the sphere plastic interval body (ponding chemistry system) on public substrate 2, element thickness d is set as about 4.0 μm.On liquid crystal layer 3, utilize vacuum impregnation to the liquid crystal material injecting Δ ε < 0, the Merck (company) of Δ n < 0.23 makes, utilizing after ultraviolet curable resin seals inlet, time little with the temperature calcination about 1 of high about 20 DEG C of the isotropy phase inversion temperature than liquid crystal material.In addition, if liquid crystal material is Δ ε is negative negative material, then the physics value of Δ n etc. does not limit.
The intersection Niccol configuration that upside Polarizer 11 is 45 degree, downside Polarizer 21 is 135 degree is carried out to the absorption shaft angle degree of Polarizer 11 and 21.For Polarizer angle, by setting intersecting angle can obtain good black state as 90 degree, be therefore preferred, but about also can offseting the several years.In addition, Polarizer material can use any one of iodine polarizing plate, dyestuff system Polarizer.
For optical compensation plate 12 and 22, between one-sided Polarizer and substrate, be laminated with two pieces of C plates (Re=0nm, Rth=220nm).In addition, optical compensation plate (A plate, C plate, B plate: 2 axle polarizers) also can be inserted between the Polarizer of both sides and substrate.
Fig. 2 is the general view that the segment electrode 34 of the present invention the 1st embodiment and the electrode pattern of public electrode 24 are shown.This planimetric map is the figure of the liquid crystal display cells observing Fig. 1 from normal direction.In this instance, public electrode 34 uses the electrode pattern A2 shown in Fig. 6 described later (B).
In fig. 2, side electrode indicated by the solid line is at the longer segment electrode 34 in the orientation from 6 o'clock to 12 o'clock, and lower lateral electrode represented by dashed line is the public electrode 24 extended on its orthogonal directions.Each cross part of electrode 34 and public electrode 24 forms a pixel 9, in the 1st embodiment, becomes hexagon as shown in Figure 2.
As shown in the figure, the liquid crystal layer 3 between segment electrode 34 and public electrode 24 is implemented to the substrate surface orientation process making central molecule along 12 orientation orientations.According to the position relation that the liquid crystal layer central molecule when applying voltage is swung to, optimum visual identification direction is 6 orientation.On the other hand, when changing with the element normal direction observation polar angle angle that is benchmark, it is dimmed and be difficult to the angle of visual identity to there is bright display in its opposite orientation.
The adjacent pixel in left and right is configured in the mode of downward shift half-pixel, and public electrode 24 is advanced so that the structure of integrally bending is bending and extends in orientation, left and right.On the other hand, segment electrode 34 bend with left and right edges, as snake abdomen be configured in upper and lower orientation extend.Therefore, for each pixel 9 of each cross part as segment electrode 34 and public electrode 24, have drift angle in nine o'clock spot, 3 orientation, its angle is 90 ° ± 10 °, preferably approximately 90 °.Clipping angle formed by the both sides of left and right drift angle and substrate level direction is 45 ° ± 10 °, preferably approximately 45 °.That is, 4 limits clipping left and right drift angle absorb axle relative to upper and lower Polarizer and become almost parallel or orthogonal state, therefore can suppress the light leak of near threshold voltage.In addition, orientation towards the opposite, the pinnacle of left and right drift angle.The both sides in 12 points, 6 orientation are the limit of the right and left bit parallel relative to liquid crystal display cells.
Fig. 3 is configured in prediction concept map to liquid crystal layer central molecule director distribution when applying the voltage of more than threshold voltage between segment electrode 34 and public electrode 24 about the electrode structure of the 1st embodiment shown in Fig. 2 and LCD alignment.
In the figure of each pixel 96 orientation limit on, orientation process direction (liquid crystal director: the vergence direction of liquid crystal molecule) is equal with the orientation orientation of tilting electric field.On the limit of the latter half in orientation, left and right in the drawings, segment electrode and public electrode edge almost parallel, almost do not produce tilting electric field, so towards the original orientation orientation of liquid crystal layer.The first half in orientation, left and right in the drawings, produces tilting electric field between segment electrode 34 and public electrode 24, orientation orientation rotation 45 °.The limit in 12 orientation is identical with existing electrode structure, and the orientation orientation that the orientation orientation of tilting electric field is original with liquid crystal layer differs 180 °, thus think produce black intersect BC.Therefore, the state limit in control 12 orientation producing tilting electric field is needed.
Fig. 4 is the general view with an example of the electrode pattern of peristome 34a that the present invention the 1st embodiment is shown.
As mentioned above, the reason of display unevenness is considered to the generation position not having fixed black intersection BC, therefore as its solution, consider to make not produce black intersection BC itself near pixel upper edge 7 or make black intersection BC even in each pixel.
Therefore, in the 1st embodiment, segment electrode 34 as shown in Figure 4 near pixel limit 7 configures rectangular aperture portion 34a, this pixel limit 7 is in direction that direction that the liquid crystal molecule based on the pixel center portion of orientation process tilts and the liquid crystal molecule based on the pixel edge portion of tilting electric field tilt and reverses the relation of (reverse direction).
In the diagram, be configured at left and right directions public electrode 24 line between the relative segment electrode 34 in portion arranges rectangular aperture portion 34a.The lower edges spacing W of peristome 34a is greater than the wire spacing d (W > d) of public electrode 24, crosses over two neighbouring pixels 9 and forms peristome 34a.In addition, the lower edge 8 of the pixel 9 that the upper edge position of peristome 34a is adjacent compared to upper direction, is in the inner side of the adjacent pixel in direction on this 9, and the lower edge position of peristome 34a, compared to the upper edge 7 of pixel 9, is the inner side of pixel 9.
In the example shown in Figure 4, be only provided with a peristome 34a, but as shown in Fig. 6 (A), also by the size of height W, width s, and adjacent peristome 34a vacates interval e and periodically configures multiple peristome 34a.
In addition below, in this manual, the electrode pattern lower edges spacing W of the peristome 34a shown in this Fig. 4 being greater than the wire spacing d of public electrode 24 is set to electrode pattern A.
Fig. 5 is the general view with an example of the electrode pattern of peristome 34b that the present invention the 1st embodiment is shown.
In Figure 5, be configured at left and right directions public electrode 24 line between the relative segment electrode 34 in portion arranges rectangular aperture portion 34b.The upper edge position of peristome 34b is set to the center of the vertical direction in portion between the line compared to public electrode 24, is positioned at the upper edge 7 close to pixel 9.The lower edge position of peristome 34b is set to the inner side being positioned at pixel 9 compared to the upper edge 7 of pixel 9.The lower edges spacing W of peristome 34b is set to the wire spacing d and the half being more than or equal to wire spacing d (d > W >=1/2d) that are at least less than public electrode 24.In addition, in the mode at least making the part in portion between the line of a part of peristome 34b and public electrode 24 overlap in plan view, configuration peristome 34b.
In the example as shown in fig. 5, be only provided with a peristome 34b, but as shown in Fig. 7 (A), also can pass through the size of height W, width s, and adjacent peristome 34b vacate interval e and configures multiple peristome 34b periodically.
In addition below, in this manual, the electrode pattern lower edges spacing W of the peristome 34b shown in this Fig. 5 being less than the wire spacing d of public electrode 24 is set to electrode pattern B.
Fig. 6 is the general view of electrode pattern A1 ~ A3 that the 1st embodiment is shown.This planimetric map is the figure of the liquid crystal display cells observing Fig. 1 from normal direction.Fig. 6 (A) ~ (C) corresponds respectively to the pattern A1 ~ A3 had with the peristome 34a of 3 kinds of sizes shown in following table 1.The size at each position shown in Fig. 4 is shown in Table 1.
[table 1]
| Pattern | d | W | s | e | P |
| A1 | 30μm | 60μm | 51.1μm | 51.1μm | 255.5μm |
| A2 | 30μm | 60μm | 92μm | 92μm | 276μm |
| A3 | 30μm | 60μm | 65.7μm | 131.4μm | 328.5μm |
Fig. 6 (A) is the general view that electrode pattern A1 is shown.Pattern A1 is the example being configured with two peristome 34a1 in each pixel 9.As shown in table 1, when being set as the length P=255.5 μm of upper edge 7 of pixel 9, the size of peristome 34a1 is set as height W=60 μm, width s=51.1 μm, and the interval e between the interval e between peristome 34a1 or each peristome 34a1 and pixel edge end (end of the upper edge 7 of pixel 9) and the width s phase of peristome 34a1 are all 51.1 μm.
Fig. 6 (B) is the general view that electrode pattern A2 is shown.Pattern A2 is the example being configured with a peristome 34a2 in each pixel 9.As shown in table 1, when being set as the length P=276 μm of upper edge 7 of pixel 9, the size of peristome 34a2 is set as height W=60 μm, width s=92 μm, and the interval e between peristome 34a2 and pixel edge end (end of the upper edge 7 of pixel 9) and the width s phase of peristome 34a2 are all 92 μm.
Fig. 6 (C) is the general view that electrode pattern A3 is shown.Pattern A3 is the example being configured with a peristome 34a3 in each each pixel 9.As shown in table 1, when being set as the length P=328.5 μm of upper edge 7 of pixel 9, the size of peristome 34a3 is set as height W=60 μm, width s=65.7 μm, and the interval e between peristome 34a3 and pixel edge end (end of the upper edge 7 of pixel 9) is 2 times namely 131.4 μm of the width s of peristome 34a3.
Fig. 7 is the general view of electrode pattern B1 ~ B3 that the 1st embodiment is shown.This planimetric map is the figure of the liquid crystal display cells observing Fig. 1 from normal direction.Fig. 7 (A) ~ (C) corresponds respectively to the pattern B1 ~ B3 had with the peristome 34b of 3 kinds of sizes shown in following table 2.Table 2 illustrates the size at each position shown in Fig. 5.
[table 2]
| Pattern | d | w | s | e | P |
| B1 | 30μm | 30μm | 51.1μm | 51.1μm | 255.5μm |
| B2 | 30μm | 30μm | 92μm | 92μm | 276μm |
| B3 | 30μm | 30μm | 65.7μm | 131.4μm | 328.5μm |
Fig. 7 (A) is the general view that electrode pattern A1 is shown.Pattern A1 is the example being configured with two peristome 34b1 in each pixel 9.As shown in table 1, when being set as the length P=255.5 μm of upper edge 7 of pixel 9, the size of peristome 34b1 is set as height W=30 μm, width s=51.1 μm, and the interval e between the interval e between peristome 34b1 or each peristome 34b1 and pixel edge end (end of the upper edge 7 of pixel 9) and the width s phase of peristome 34b1 are all 51.1 μm.
Fig. 7 (B) is the general view that electrode pattern A2 is shown.Pattern A2 is the example being configured with a peristome 34b2 in each pixel 9.As shown in table 1, when being set as the length P=276 μm of upper edge 7 of pixel 9, the size of peristome 34b2 is set as height W=30 μm, width s=92 μm, and the interval e between peristome 34b2 and pixel edge end (end of the upper edge 7 of pixel 9) and the width s phase of peristome 34b2 are all 92 μm.
Fig. 7 (C) is the general view that electrode pattern A3 is shown.Pattern A3 is the example being configured with a peristome 34b3 in each pixel 9.As shown in table 1, when being set as the length P=328.5 μm of upper edge 7 of pixel 9, the size of peristome 34b3 is set as height W=30 μm, interval e between width s=65.7 μm, peristome 34b3 and pixel edge end (end of the upper edge 7 of pixel 9) is 2 times namely 131.4 μm of the width s of peristome 34b3.
Orientation macrograph when Fig. 8 and Fig. 9 is the front observation of the liquid crystal display cells 100 of the present invention the 1st embodiment.Fig. 8 (A) ~ (C) uses the electrode pattern A1 ~ A3 shown in Fig. 6 (A) ~ (C) to make liquid crystal display cells 100, to take the photo of this liquid crystal display cells 100 gained respectively.Fig. 9 (A) ~ (C) uses the electrode pattern B1 ~ B3 shown in Fig. 7 (A) ~ (C) to make liquid crystal display cells 100, to take the photo of this liquid crystal display cells 100 gained respectively.
Known when upper portion (near the upper edge 7) of observation 1 pixel, no matter use which of electrode pattern A1 ~ B3, in each pixel 9, produce black all roughly equably intersect the pattern of BC, fixed black can intersect BC.Which that is, no matter in electrode pattern, all confirm to intersect the significantly different state of the shape of BC less than black in each pixel.Therefore known, when using above-mentioned electrode pattern, even if observe from 12 orientation as anti-visual identity orientation in appearance, also can guarantee show uniformity identically with optimum visual identification orientation.
In addition we know, the adjacent edges place of the peristome 34b1 ~ 34b3 shown in Fig. 9 (A) ~ (C), does not produce black intersection BC.The reason not producing black intersection BC is considered to: owing to arranging peristome 34b, thus the tilting electric field of this peristome 34b generation orientation is opposite orientation, identical with the orientation of liquid crystal director near pixel upper side edge edge 7.That is, think near the upper edge 7 of peristome 34b, do not cause the reversion of liquid crystal director.
Like this, by arranging peristome 34b, although electrode opening rate reduces, not producing black intersection BC at the adjacent edges of peristome 34b, therefore can find the tendency that the actual effect aperture opening ratio in 1 pixel rises.
In addition, the electrode pattern B3 shown in electrode pattern A3 and Fig. 9 (C) as shown in Fig. 8 (C), knownly some interference are produced substantially beyond the shape of BC can be intersected to the black of each pixel when 100 μm as interval e or width s.Therefore, in order to realize good display state, effective mode is preferred interval e and width s is less than 100 μm.
In addition, preferably making near this upper edge 7 of the light leak occurring near threshold voltage short as much as possible, is also same near the lower edge 8 of pixel 9.From the viewpoint of electrode resistance, the left and right length of upper edge 7 and lower edge 8 is preferably more than 10 μm, more preferably more than 30 μm.Think in addition, when the left and right length on these both sides is below 100 μm, even if do not arrange rectangular aperture portion 34a or 34b, the display that also can not produce reflexive visual identity orientation is uneven.
Figure 10 (A) is that photo is observed in the front of the orientation tissue of the pixel edge 9B of pixel 9 in the electrode structure shown in Fig. 2.Figure 10 (B) is that photo is observed in the front of the orientation tissue of the pixel edge 9C of pixel 9 in electrode structure shown in Fig. 2.
Pixel edge 9B is parallel for being rotated counterclockwise roughly 45 ° from 12 orientation, absorbs axle parallel or orthogonal relative to upper and lower Polarizer.Because orientation orientation rotates 45 ° from pixel mediad edge, although so do not produce black intersection BC, observe dark areas at adjacent edges.But with the black produced near the limit, pixel left and right in existing structure intersect BC dark areas compared with, the former area is less.Impact at pixel edge 9C place hardly by tilting electric field, so do not observe dark areas completely at adjacent edges.
In above research, the actual sample that utilization is about 89.95 ° relative to the tilt angle of base plan is verified, but when being less than tilt angle 89.5 °, even if the display also not observing the anti-visual identity orientation caused due to the interference of the black intersection BC of pixel edge in existing structure is uneven.Therefore, the 1st embodiment of the present invention is effective when tilt angle more than 89.5 °.
Above, according to the 1st embodiment of the present invention, in the liquid crystal display cells using dot matrix electrode pattern, when the part of public electrode 24 and segment electrode 34 being intersected is set to 1 pixel, on the segment electrode 34 forming limit 7, between the electrode of public electrode 24 central portion side from pixel edge to pixel inside region, be provided with rectangular aperture portion 34a or 34b, wherein, the liquid crystal director (vergence direction of liquid crystal molecule) that this limit 7 is in the pixel center portion caused by the orientation process of this pixel and the liquid crystal director (vergence direction of liquid crystal molecule) caused by the pixel edge portion of tilting electric field reverse the relation of (reverse direction), fixed black can intersect the point of crossing CP of BC in region between peristome 34a or 34b thus.In addition, when arranging peristome 34b, can suppress to produce black intersection BC at the adjacent edges of this peristome 34b.Thereby, it is possible to eliminate in anti-visual identity direction and the display unevenness that is clockwise and that produce about being rotated counterclockwise 70 degree of orientation centered by it, obtain the show uniformity be equal to optimum visual identification orientation.
In addition, by the shape of pixel 9 is set to hexagon, making the pixel edge except upper edge 7 and lower edge 8 absorb axle almost parallel or orthogonal ((angle that an axle at least up and down in Polarizer absorption axle and this 4 limits are formed is the state within the scope of 0 ° ± 10 ° or 90 ° ± 10 °)) relative to upper and lower Polarizer thus, the light leak of the pixel adjacent edges when applying the voltage of near threshold voltage can being eliminated.
Then, the 2nd embodiment of the present invention is described.Only electrode structure is different compared with the 1st embodiment for 2nd embodiment, and other structure is identical in fact, therefore, is described centered by electrode structure, omits other explanation.
Figure 11 is the general view that the segment electrode 54 of the present invention the 2nd embodiment and the electrode pattern of public electrode 44 are shown.This planimetric map is the figure of the liquid crystal display cells 100 observing Fig. 1 from normal direction.
In fig. 11, be at the longer segment electrode 54 in the orientation from 6 o'clock to 12 o'clock with the side electrode shown in solid line, the lower lateral electrode be shown in broken lines is public electrode 44 longer on its orthogonal directions.Each cross part of segment electrode 54 and public electrode 44 forms a pixel 9, in the 2nd embodiment, is hexagon as shown in figure 11.
2nd embodiment is the structure that the shape comparing segment electrode and public electrode with the electrode structure of the 1st embodiment is exchanged.That is, the pixel that left and right is adjacent configures in the mode of downward shift half-pix, and segment electrode 54 is advanced so that the structure of integrally bending is bending and extends in upper and lower orientation.On the other hand, public electrode 44 bends with lower edges, being configured in orientation, left and right as snake abdomen extend.In a pixel 9, have summit in upper and lower orientation (12 points, 6 orientation), its angle is 90 ° ± 10 °, is preferably about 90 °.Be constructed as follows hexagon: the both sides (pixel edge 9A) in orientation, left and right (nine o'clock spot, 3 orientation) are relative to liquid crystal display cells upper and lower bit parallel.4 limits (pixel edge 9B, 9C, 9D) clipping upper and lower drift angle absorb state that axle becomes almost parallel or orthogonal (at least up and down Polarizer absorb angle that an axle in axle and this 4 limits form be in state in the scope of 0 ° ± 10 ° or 90 ° ± 10 °), therefore, it is possible to the light leak of suppression near threshold voltage relative to upper and lower Polarizer.In addition, mutual orientation towards the opposite, the pinnacle of upper and lower drift angle.The both sides in orientation, left and right are the limit parallel relative to liquid crystal alignment orientation.
The orientation orientation of liquid crystal layer central molecule is 12 orientation, and segment electrode 54, public electrode 44 are configured in the front and back of real estate respectively.The pixel edge 9A (limit, left and right) of Figure 11 is equivalent to the pixel edge 9A of the 1st embodiment, due to liquid crystal alignment orientation and pixel edge 9A almost parallel, therefore be the structure identical with the right and left of Figure 18 of prior art, because orientation is organized also identical with Figure 19, so be considered to not need fixed black intersection BC, do not need to configure rectangular aperture portion 34a or 34b as the 1st embodiment.
Figure 12 is the prediction concept map of liquid crystal layer central molecule director distribution when applying the voltage of more than threshold voltage between segment electrode 54 and public electrode 44 in the electrode structure and LCD alignment structure of the 2nd embodiment shown in Figure 11.
In the both sides clipping the drift angle on the upside of pixel, the left side is because the edge of segment electrode 54 and public electrode 44 is roughly equal, so produce tilting electric field hardly and arrange in the alignment direction that liquid crystal layer is original, the right (the pixel edge 9B of Figure 11) produces tilting electric field, thinks thus and rotates 45 ° at adjacent edges director.As mentioned above, the right and left (the pixel edge 9A of Figure 11) is equal with the orientation state of the prior art shown in Figure 20.In the both sides clipping the drift angle on the downside of pixel, for the left side (the pixel edge 9C of Figure 11), because the edge of segment electrode 54 and public electrode 44 is almost equal, so think in the orientation orientation arrangement that liquid crystal layer is original, but the orientation orientation that the orientation orientation of edge (the pixel edge 9D of Figure 11) tilting electric field is original with liquid crystal layer on the right roughly differs 135 °, so produce the rotation of director at adjacent edges, observe black intersection BC.
Figure 13 is that photo is observed in the front of the orientation tissue of the pixel edge 9D of Figure 11.
About the orientation tissue of pixel edge 9D, near edge part, observe black as shown in the figure intersect the dark areas of BC, no matter but in which pixel 9, all do not observe the point of crossing CP that black intersects, confirm uniform orientation tissue.In addition, the orientation tissue of the pixel edge 9A of Figure 11 is organized identical with the orientation near the pixel left and right edges of the prior art shown in Figure 19, and pixel edge 9B and 9C organizes identical with the orientation shown in Figure 10 (A) and (B) respectively.
Then, the 3rd embodiment of the present invention is described.3rd embodiment is compared with the 2nd embodiment with the 1st embodiment, and only electrode structure is different, and other structure is identical in fact, therefore, is described centered by electrode structure, omits other explanation.
Figure 14 is the general view that the segment electrode 74 of the present invention the 3rd embodiment and the electrode pattern of public electrode 64 are shown.This planimetric map is the figure of the liquid crystal display cells 100 observing Fig. 1 from normal direction.
In fig. 14, be the segment electrode 74 that orientation was longer from 6 o'clock to 12 o'clock with the side electrode shown in solid line, the lower lateral electrode be shown in broken lines is public electrode 64 longer on its orthogonal directions.Each cross part of segment electrode 74 and public electrode 64 forms a pixel 9, is hexagon as shown in figure 14 in the 3rd embodiment.
Under the shape of pixel 9 is usual hexagonal situation, 4 limits can be made to absorb axle relative to upper and lower Polarizer almost parallel or orthogonal, but it is almost parallel or orthogonal that remaining both sides can not absorb axle relative to upper and lower Polarizer, therefore when applying the voltage of near threshold voltage, produce light leak in the marginal portion on these two limits, produce the reduction of contrast.For the pixel 9 of common hexagonal shape, can't suppress completely from suppressing the viewpoint of light leak.
Therefore, in the 3rd embodiment, based on the electrode structure of the 1st embodiment, have studied and whether can be out of shape electrode structure, to make the part on above-mentioned two limits also ± 10 at 45 ° relative to the transverse direction of liquid crystal indicator °, preferably become about 45 ° (angle formed with above-mentioned both sides that Polarizer absorbs in axle at least is up and down 0 ° ± 10 ° or 90 ° ± 10 °).Have studied various electrode pattern, result obtains the electrode structure of the 3rd embodiment shown in Figure 14.
The shape of the pixel 9 of the 3rd embodiment and the 1st embodiment are similarly the hexagon of existence 6 drift angles, but its difference is, also configures drift angle in upper and lower orientation, become " pinnacle type " that the orientation, pinnacle of these drift angles is consistent.Thus, the connection of each pixel be made up of segment electrode 74 and public electrode 64 can not have problems, and all limits of pixel 9 and Polarizer can be made to absorb axle almost parallel or roughly orthogonal.
Compared with the electrode structure of the 1st embodiment, the shape of segment electrode 74 is remove the shape of peristome from the segment electrode 34 of the 1st embodiment.The shape of public electrode 64 is the shape of Xing He little pinnacle, lower edges alternate repetition large pinnacle type.In the 3rd embodiment, there is not the limit of the pixel edge 9A be equivalent in other embodiment.
Figure 15 is the prediction concept map to liquid crystal layer central molecule director distribution when applying the voltage of more than threshold voltage between segment electrode 74 and public electrode 64 in the electrode structure of the 3rd embodiment shown in Figure 14 and LCD alignment structure.
The director on the limit, left and right (pixel edge 9D) near the summit, 12 orientation of pixel 9 is due to the impact of tilting electric field, become from the orientation after the original orientation orientation rotation 135 ° of liquid crystal layer 3, so think that producing black at pixel edge 9D (Figure 14) periphery intersects BC.In pixel edge 9C, the edge of segment electrode 74 and public electrode 64 is roughly equal, so produce tilting electric field and liquid crystal layer hardly in the arrangement of original alignment direction, in pixel edge 9B, owing to producing tilting electric field, therefore think and rotate 45 ° at adjacent edges director.
In addition, what when the voltage of pixel edge 9B ~ 9D applies, orientation was organized respectively with shown in Figure 10 (A), 10 (B), Figure 13 is identical.
In the electrode structure of the 3rd embodiment, almost do not find the difference of each pixel of the black intersection BC near pixel edge, observe in appearance evenly yet.And all limits confirmed for pixel 9 eliminate the light leak of near threshold voltage and improve contrast.
As the variation of the 3rd embodiment, as shown in Figure 16 (A), the pixel 9 of the 3rd embodiment can also be made to reverse in the vertical direction.But as shown in Figure 16 (A), in pixel edge portion, the length on the limit (pixel edge 9D) of the orientation orientation rotation 135 ° that director is original relative to liquid crystal layer is elongated compared with the 3rd embodiment.Compared with the 3rd embodiment, dark areas likely becomes many a little.
In addition, as another variation of the 3rd embodiment, as shown in Figure 16 (B), the electrode structure integral-rotation 90 ° of the 3rd embodiment can be made, and exchange the shape of segment electrode and public electrode.In addition, another variation shown in Figure 16 (B) can also be set to the structure revolving turnback.That is, the orientation on the pinnacle of the drift angle towards same orientation being present in above-below direction can also be made all towards position, left or all towards right bit.
Above, according to various embodiments of the present invention, in the liquid crystal display cells using dot matrix electrode pattern, when the part of setting public electrode and segment electrode to intersect is as 1 pixel, by primitive shape being set as the hexagon on the limit (angle that an axle at least up and down in Polarizer absorption axle and this limit are formed is 0 ° ± 10 ° or 90 ° ± 10 °) comprising or quadrature almost parallel relative to upper and lower Polarizer absorption axle (Polarizer absorbs an axle in axle at least up and down), the light leak of near threshold voltage can be suppressed thus.
In addition, according to the 1st embodiment, on the segment electrode 34 forming limit 7, between the electrode of public electrode 24 central portion side from pixel edge to pixel inside region rectangular aperture portion 34a or 34b is set, wherein this limit 7 liquid crystal director (vergence direction of liquid crystal molecule) of being in the pixel center portion caused by the orientation process of pixel and the liquid crystal director (vergence direction of liquid crystal molecule) in the pixel edge portion caused by tilting electric field reverse the relation of (reverse direction), can be fixed the point of crossing CP of black intersection BC in region between peristome 34a or between peristome 34b thus.Thereby, it is possible to realize show uniformity.
In addition, according to the 2nd, the 3rd embodiment and their variation, by cancelling the limit orthogonal with liquid crystal director (vergence direction of liquid crystal molecule), the generation of the point of crossing CP of black intersection BC can be suppressed, realizes show uniformity.
Describe the present invention according to above embodiment, but the present invention is not limited thereto.Such as, to those skilled in the art, various change, improvement, combination etc. can be carried out.
Claims (10)
1. a liquid crystal display cells, this liquid crystal display cells has:
A pair transparency carrier, it is oppositely disposed at predetermined intervals;
Multiple 1st transparency electrode, it is formed at an opposite face side of above-mentioned transparency carrier;
Multiple 2nd transparency electrode, it is formed at another opposite face side of above-mentioned transparency carrier in the mode extended in the direction orthogonal with above-mentioned 1st transparency electrode;
Single domain vertical orientation film, it is formed at each opposite face side of above-mentioned transparency carrier, at least one party of this single domain vertical orientation film, has carried out the process of single domain vertical orientation in the mode parallel with the length direction of above-mentioned 1st transparency electrode;
The liquid crystal layer of vertical alignment mode, it is clamped by above-mentioned a pair transparency carrier, has tilt angle; And
A pair Polarizer, it configures in the mode clamping above-mentioned a pair transparency carrier,
Wherein, at each cross section of above-mentioned 1st transparency electrode and above-mentioned 2nd transparency electrode, be formed with hexagonal pixels, this hexagonal pixels comprises and the limit of at least one angle formed in the absorption axle of above-mentioned a pair Polarizer within the scope of 0 ° ± 10 ° or 90 ° ± 10 °
Above-mentioned hexagonal pixels has two drift angles in the lateral direction and clips two limits of this drift angle for each drift angle respectively, the pinnacle of above-mentioned two drift angles towards orientation be contrary orientation, above-mentioned two limits relative to the left and right directions of above-mentioned liquid crystal display cells towards 45 ° ± 10 ° orientation, the angle that at least one and these two limits in the absorption axle of above-mentioned a pair Polarizer are formed is within the scope of 0 ° ± 10 ° or 90 ° ± 10 °
Between neighbouring above-mentioned pixel and with the part in the pixel be connected between this pixel, above-mentioned 1st transparency electrode is configured with rectangular aperture portion.
2. a liquid crystal display cells, this liquid crystal display cells has:
A pair transparency carrier, it is oppositely disposed at predetermined intervals;
Multiple 1st transparency electrode, it is formed at an opposite face side of above-mentioned transparency carrier;
Multiple 2nd transparency electrode, it is formed at another opposite face side of above-mentioned transparency carrier in the mode extended in the direction orthogonal with above-mentioned 1st transparency electrode;
Single domain vertical orientation film, it is formed at each opposite face side of above-mentioned transparency carrier, at least one party of this single domain vertical orientation film, has carried out the process of single domain vertical orientation in the mode parallel with the length direction of above-mentioned 1st transparency electrode;
The liquid crystal layer of vertical alignment mode, it is clamped by above-mentioned a pair transparency carrier, has tilt angle; And
A pair Polarizer, it configures in the mode clamping above-mentioned a pair transparency carrier,
Wherein, at each cross section of above-mentioned 1st transparency electrode and above-mentioned 2nd transparency electrode, be formed with hexagonal pixels, this hexagonal pixels comprises and the limit of at least one angle formed in the absorption axle of above-mentioned a pair Polarizer within the scope of 0 ° ± 10 ° or 90 ° ± 10 °
Above-mentioned hexagonal pixels has two drift angles in the lateral direction and clips two limits of this drift angle for each drift angle respectively, the pinnacle of above-mentioned two drift angles towards orientation be contrary orientation, above-mentioned two limits relative to the left and right directions of above-mentioned liquid crystal display cells towards 45 ° ± 10 ° orientation, the angle that at least one and these two limits in the absorption axle of above-mentioned a pair Polarizer are formed is within the scope of 0 ° ± 10 ° or 90 ° ± 10 °
From between neighbouring above-mentioned pixel to this pixel up to or the pixel that is connected of lower direction in a part, above-mentioned 1st transparency electrode is configured with rectangular aperture portion.
3. liquid crystal display cells according to claim 1 and 2, wherein,
Two limits up and down of above-mentioned hexagonal pixels are equal length, and adjacent left and right pixel arrangement is in the position of the semiperiod of azimuth deviation up and down relative to above-mentioned liquid crystal display cells.
4. liquid crystal display cells according to claim 1 and 2, wherein,
The transverse width in above-mentioned rectangular aperture portion and the transverse width in the region adjacent with this rectangular aperture portion are respectively less than 100 μm.
5. liquid crystal display cells according to claim 1 and 2, wherein,
The length on the both sides up and down of above-mentioned hexagonal pixels is more than 10 μm less than 100 μm.
6. liquid crystal display cells according to claim 1 and 2, wherein,
The limit, two, left and right of above-mentioned hexagonal pixels is equal length, and adjacent left and right pixel arrangement is in the position of the semiperiod of azimuth deviation up and down relative to above-mentioned liquid crystal display cells.
7. liquid crystal display cells according to claim 6, wherein,
The length of the right and left of above-mentioned hexagonal pixels is more than 10 μm less than 100 μm.
8. liquid crystal display cells according to claim 1 and 2, wherein,
The orientation of above-mentioned alignment film is implemented by rubbing.
9. liquid crystal display cells according to claim 1 and 2, wherein,
The easy axle of orientation of above-mentioned vertical orientation film is configured to antiparallel orientation.
10. liquid crystal display cells according to claim 1 and 2, wherein,
The tilt angle of above-mentioned liquid crystal layer is more than 89.5 °.
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| US5535028A (en) * | 1993-04-03 | 1996-07-09 | Samsung Electronics Co., Ltd. | Liquid crystal display panel having nonrectilinear data lines |
| CN101153985A (en) * | 2006-09-28 | 2008-04-02 | 斯坦雷电气株式会社 | Vertically aligned liquid crystal display device with visual angle compensation |
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| JP3236495B2 (en) * | 1996-02-21 | 2001-12-10 | シャープ株式会社 | Color liquid crystal display |
| JP2002098967A (en) * | 2000-09-26 | 2002-04-05 | Toshiba Corp | Liquid crystal display device |
| JP2003140169A (en) * | 2001-10-31 | 2003-05-14 | Optrex Corp | Liquid crystal display element |
| JP4846222B2 (en) * | 2004-10-06 | 2011-12-28 | スタンレー電気株式会社 | Liquid crystal display element |
| JP5324754B2 (en) * | 2007-05-10 | 2013-10-23 | スタンレー電気株式会社 | Liquid crystal display |
| US8427619B2 (en) * | 2007-09-28 | 2013-04-23 | Stanley Electric Co., Ltd. | Liquid crystal display unit |
| JP5101268B2 (en) * | 2007-12-25 | 2012-12-19 | スタンレー電気株式会社 | Liquid crystal display element |
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|---|---|---|---|---|
| US5535028A (en) * | 1993-04-03 | 1996-07-09 | Samsung Electronics Co., Ltd. | Liquid crystal display panel having nonrectilinear data lines |
| CN101153985A (en) * | 2006-09-28 | 2008-04-02 | 斯坦雷电气株式会社 | Vertically aligned liquid crystal display device with visual angle compensation |
| CN101446714A (en) * | 2007-09-28 | 2009-06-03 | 斯坦雷电气株式会社 | Liquid crystal display unit |
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