CN100345032C - Liquid crystal display elements and liquid crystal display apparatus - Google Patents
Liquid crystal display elements and liquid crystal display apparatus Download PDFInfo
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- CN100345032C CN100345032C CNB2004100619395A CN200410061939A CN100345032C CN 100345032 C CN100345032 C CN 100345032C CN B2004100619395 A CNB2004100619395 A CN B2004100619395A CN 200410061939 A CN200410061939 A CN 200410061939A CN 100345032 C CN100345032 C CN 100345032C
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Abstract
To suppress generation of disclination and to perform satisfactory image quality display having high reliability, in a liquid crystal display element. The liquid crystal display element is provided with a transparent substrate 2 having a transparent electrode 6 and an alignment layer 17 covering the transparent electrode 6, a driving circuit substrate 3 having a plurality of pixel electrodes 15 arranged in a matrix shape on the surface opposed to the transparent electrode 6 and an alignment layer 18 covering the pixel electrodes 15 and a liquid crystal layer 4 intervening between the alignment layer 17 on the transparent substrate 2 side and the alignment layer 18 on the driving circuit substrate 3 side. The alignment layers 17 and 18 give a pretilt angle in a prescribed direction X to liquid crystal molecules 4a in the liquid crystal layer 4 to vertically align the liquid crystal molecules and the pixel electrode 15 has such a shape that at least a corner part 16a positioned in the alignment direction of the liquid crystal molecule 4a among nearly rectangular four corner parts 16a, 16b, 16c and 16d is notched.
Description
Technical field
The present invention relates to liquid crystal display cells that incident light is modulated and penetrated, and use light to carry out the liquid crystal indicator that image shows by this liquid crystal display cells modulation.
Background technology
In the past, in projection display various display device such as (projectors) and display parts such as the various portable electronic apparatus and the various information processing terminals, used the liquid crystal display cells that is called as liquid crystal board or liquid crystal cells etc.With regard to this liquid crystal display cells, infiltration type and reflection-type are roughly arranged, the permeation type liquid crystal display element is to modulating from the light backlight that is disposed at the back side and penetrating as seeing through light.On the other hand, reflection type liquid crystal display element is modulated the light of incident and is penetrated as reflected light, in recent years, development along with high-definition, miniaturization and the high brightness of the projector, but as high-definition and miniaturization, and can expect display that light utilization efficiency is high and noticeable, in fact just at practicability (for example, with reference to patent documentation 1).
Particularly, reflection type liquid crystal display element has following structure: the glass substrate by will being provided with the transparency electrode that transparent conductive material such as ITO (Indium-Tin Oxide) constitutes and to be provided with aluminium be the mutual arranged opposite of drive circuit board of the reflective pixel electrode that constitutes of the metal material of principal ingredient, and the sealed material seal of its edge part forms liquid crystal layer at inside inclosure liquid crystal simultaneously.In addition, on the opposed faces of glass substrate and drive circuit board, be provided for the alignment films that liquid crystal is orientated respectively on the direction of regulation.
In this reflection type liquid crystal display element,, liquid crystal layer is applied electric field by between mutual opposed transparency electrode and reflective pixel electrode, applying voltage.At this moment, in liquid crystal layer, optical characteristics changes along with interelectrode potential difference (PD), makes the light that passes through modulated.Thus, in reflection type liquid crystal display element, can carry out the tone demonstration that optical modulation produces.
In addition, recently, it is fast and noticeable because of contrast height, response speed that use will have the device of the vertical orientated vertical orientated liquid crystal of the nematic liquid crystal of negative dielectric anisotropy.When this vertical orientated liquid crystal was zero at driving voltage, liquid crystal molecule carried out the so-called black display that is called as the standard black display mode with respect to substrate approximate vertical orientation.On the other hand, if apply driving voltage, then liquid crystal molecule reverses on the direction of regulation, changes the transmitance of light by the birefringence that produces this moment.
In addition, in this vertical orientated liquid crystal, shown in Fig. 7 and Fig. 8 A, Fig. 8 B, if the vergence direction of liquid crystal molecule 200 is different, then produce the irregular of light and shade, the major axis of liquid crystal molecule 200 only need be produced on certain direction X with respect to the pre-tilt angle θ of the normal slope of the drive circuit board 202 that has formed pixel electrode 201 and vertical orientated.With produce this pre-tilt direction X, be the direction of orientation of liquid crystal molecule 200 be set at generally by with optical system combination such as polarization plates make the transmitance maximum device roughly to the angular direction, promptly as the pixel electrode 201 of square shape roughly roughly to roughly 45 ° of directions of angular direction.In addition, if pre-tilt angle θ is excessive, the deterioration of then vertical orientated property, black-level rises, and contrast descends, and V-T (driving voltage-transmitance) curve is exerted an influence.Therefore, usually, control pre-tilt angle θ by 1 °～7 ° angular range.
As the alignment films that in this vertical orientated liquid crystal, produces pre-tilt, use monox inorganic material such as (SiO) with respect to substrate from the oblique electroplated film of tilted direction plating and the polymeric membrane of having implemented the polyimide etc. of milled processed from the teeth outwards.And the direction and the angle control thereof that produce pre-tilt under the former situation of oblique electroplated film, are controlled the incident direction and the plating angle of this oblique plating, and under the situation of the latter's polymeric membrane, control it and grind direction and condition thereof.
[patent documentation 1]
The spy opens the 2003-57674 communique
, in above-mentioned liquid crystal display cells, if adjacent pixel electrodes 201 is applied the voltages of different sizes, then have between pixel and near the transverse electric field of generation inside surface direction, the problem of the fall into disarray of the liquid crystal molecule 200 that producing crosstalks causes.The confusion of this liquid crystal molecule 200 is commonly referred to as swing offset (デ イ ス Network リ ネ one シ ヨ Application).
For example, in the driving method that is called as capable inversion driving with the reversal of poles of signal voltage when every scanning delegation, when the polarity of voltage of adjacent pixel electrodes 201 was reverse, when for example making the polarity of voltage counter-rotating in the scope of ± 5V, its potential difference (PD) also reached 10V.Therefore, be the position that whole white shows originally, because of the transverse electric field of 201 of adjacent pixel electrodes does not tilt liquid crystal molecule 200, promptly become the state of obfuscation slightly that is not white states, form the swing offset of striated.
In liquid crystal display cells, for the deterioration of image that prevents that such swing offset from causing, the general driving method that is called as the frame inversion driving that makes the reversal of poles of driving voltage every a frame that adopts.According to this driving method, the voltage of adjacent pixel electrodes 201 is identical when whole white shows, so do not form the swing offset that the transverse electric field produces.In addition, even when medium tone shows, the polarity of the voltage of adjacent pixel electrodes 201 is not reverse at least, and potential difference (PD) also for the row inversion driving half, so compare with the situation of above-mentioned employing row inversion driving method, is crosstalked and obviously reduced.
But,, when adjacent pixels is carried out the big demonstration of white and the luminance difference of black, be difficult to the influence of crosstalking of avoiding the transverse electric field to cause at 201 of the pixel electrodes of these adjacent pixels even adopt the situation of such frame inversion driving method.
This situation about having the greatest impact for example is to carry out the situation that white shows in the black display of frame shape shown in Figure 9, in this white shows, form two swing offset line 203a, 203b prolonging along the border of black display from the bight of the direction X that produces above-mentioned pre-tilt.And, in the pixel electrode 201a that these two swing offset line 203a, 203b intersect, shown in Figure 10 amplifies, form the most complicated swing offset 203c.
As shown in figure 11, because of on all directions, produce the fall into disarray of the liquid crystal molecule 200 that causes of crosstalking from transverse electric field (representing with arrow among Figure 11) with pixel electrode 202a adjacent pixel electrodes 202b, 202c, 202d, thereby in the bight of the direction X of the generation pre-tilt of pixel electrode 202a, this swing offset 203c presents the complicated shape of distorted shape.Therefore, in the liquid crystal display cells of the swing offset 203c that produces such complexity, bring out the remarkable deterioration of picture quality, cause the decline of long-term reliability simultaneously.
Summary of the invention
Therefore, the present invention proposes in view of such situation in the past, and its purpose is, a kind of liquid crystal display cells is provided, and by suppressing to produce swing offset, can improve picture quality and reliability.
In addition, the object of the present invention is to provide a kind of liquid crystal indicator, suppress to produce swing offset, carry out the high preferable image quality of reliability and show by such liquid crystal display cells.
In order to realize this purpose, liquid crystal display cells of the present invention comprises: transparency carrier has the alignment films of transparency electrode and covering transparent electrode; Drive circuit board, have with opposed of transparency electrode on rectangular a plurality of pixel electrodes arranged and the alignment films that covers pixel electrode; And liquid crystal layer, be interposed between the alignment films of the alignment films of transparent substrate side and drive circuit board side; It is characterized in that: alignment films makes the major axis of the liquid crystal molecule of liquid crystal layer produce on the direction of regulation with respect to the pre-tilt angle of the normal slope of drive circuit board and is vertical orientated, pixel electrode has in four jiaos bight of essentially rectangular, is positioned at the shape of bight otch of the direction of orientation of liquid crystal molecule to the major general.
As described above, in liquid crystal display cells of the present invention, in four jiaos bight of the essentially rectangular of rectangular a plurality of pixel electrodes arranged, the bight otch of the direction of orientation of liquid crystal molecule will be positioned at least, so the distance between the bight of the bight of the direction of orientation of liquid crystal molecule and adjacent pixel electrodes of this pixel electrode is elongated, the transverse electric field produces the electric field intensity of crosstalking weakens, thereby the bight that can be suppressed at the pixel electrode of the direction of orientation that is positioned at liquid crystal molecule produces the swing offset with complicated shape.
In addition, liquid crystal indicator of the present invention uses the light by the liquid crystal display cells modulation to carry out the image demonstration, and wherein, liquid crystal display cells comprises: transparency carrier has the alignment films of transparency electrode and covering transparent electrode; Drive circuit board, have with opposed of transparency electrode on rectangular a plurality of pixel electrodes arranged and the alignment films that covers pixel electrode; And liquid crystal layer, be interposed between the alignment films of the alignment films of transparent substrate side and drive circuit board side; It is characterized in that: alignment films makes the major axis of the liquid crystal molecule of liquid crystal layer produce on the direction of regulation with respect to the pre-tilt angle of the normal slope of drive circuit board and is vertical orientated, pixel electrode has in four jiaos bight of essentially rectangular, and the shape of otch is arranged to the bight that the major general is positioned at the direction of orientation of liquid crystal molecule.
As described above, in liquid crystal indicator of the present invention, in four jiaos bight of the essentially rectangular of rectangular a plurality of pixel electrodes arranged of liquid crystal display cells, the bight otch of the direction of orientation of liquid crystal molecule will be positioned at least, so the distance between the bight of the bight of the direction of orientation of liquid crystal molecule and adjacent pixel electrodes of this pixel electrode is elongated, the transverse electric field produces the electric field intensity of crosstalking and weakens, thereby the bight that can be suppressed at the pixel electrode of the direction of orientation that is positioned at liquid crystal molecule produces the swing offset with complicated shape, can use the light by this liquid crystal display cells modulation to carry out suitable image demonstration.
Description of drawings
Fig. 1 is the sectional view that the structure of reflection type liquid crystal display element of the present invention is adopted in expression.
Fig. 2 is the mode chart of the structure of expression drive circuit board of above-mentioned reflection type liquid crystal display element and switch driving circuit.
Fig. 3 is the major part planimetric map of the reflective pixel electrode structure of the above-mentioned reflection type liquid crystal display element of expression.
Fig. 4 amplifies in the above-mentioned reflective liquid crystal display element of expression to produce the major part planimetric map of the position that intersects at two swing offset lines that carry out among the black display of frame shape under the white demonstration situation.
Fig. 5 is the planimetric map of the variation of expression reflective pixel electrode.
Fig. 6 is the block scheme that reflective liquid crystal projector structure of the present invention is adopted in expression.
Fig. 7 is the planimetric map that is illustrated in the drive circuit board of the pre-tilt direction that produces in the vertical orientated liquid crystal.
Fig. 8 is the direction of orientation of expression liquid crystal molecule with respect to pixel electrode shown in Figure 7, and Fig. 8 A is its planimetric map, and Fig. 8 B is its outboard profile.
Fig. 9 is the planimetric map that carries out the state of white demonstration in the existing liquid crystal display cells of expression among the black display of frame shape.
Figure 10 is that two swing offset lines that amplify expression liquid crystal display cells shown in Figure 9 produce the major part planimetric map of the position that intersects.
Figure 11 is that two swing offset lines shown in the pattern ground presentation graphs 10 produce the pixel electrode of intersection and the major part planimetric map of the transverse electric field situation between the adjacent pixel electrodes.
Embodiment
Below, with reference to accompanying drawing on one side explain employing of the present invention liquid crystal display cells and liquid crystal indicator on one side.
At first, the reflection type liquid crystal display element 1 of active type of the present invention that employing shown in Figure 1 has been described.
This reflection type liquid crystal display element 1 comprises: mutual opposed transparency carrier 2 and drive circuit board 3; By between these transparency carriers 2 and drive circuit board 3, injecting the liquid crystal layer 4 that liquid crystal 4a forms; And with the encapsulant 5 of the edge part of these transparency carriers 2 and drive circuit board 3 sealing.
As shown in Figures 1 and 2, drive circuit board 3 switch driving circuit 9 that for example will constitute by the FET (Field Effect Transistor) 7 of C-MOS (Complementary-MetalOxide Semiconductor) type and n channel MOS type, to the capacitor 8 as auxiliary capacitor of liquid crystal layer 4 service voltages on silicon substrate in each pixel rectangular arrangement form a plurality of.In addition, on this silicon substrate, signal wire 10 that is electrically connected with the source electrode of each FET7 and the sweep trace 11 that is electrically connected with the grid of each FET7 form a plurality of on orthogonal direction side by side, and the crossover location of these signal wires 10 and sweep trace 11 becomes and each pixel 12a corresponding display 12.And the outside in these viewing areas 12 will form as logic section at the signal driver 13 that applies display voltage on each signal wire 10, the scanner driver 14 that applies strobe pulse on each sweep trace 11.Have, switch driving circuit 9 has corresponding withstand voltage of driving voltage with liquid crystal layer 4 because of needing transistor, so compare with common logic section, makes of high withstand voltage operation again.
In addition, on silicon substrate, reflective pixel electrode 15 rectangular arrangement in each pixel that will be electrically connected with the drain electrode of each FET7 forms a plurality of.Shown in Fig. 3 amplified, this reflective pixel electrode 15 had the octagonal shape with foursquare four jiaos bight 16a, 16b, 16c, 16d linear incision.This reflective pixel electrode 15 by have in the viewing area high reflectance, for example with aluminium (Al), specifically be that the metal film of principal ingredient constitutes with the aluminium (Al) that has only added copper (Cu) below several weight % and silicon (Si) that is used to connect up in the LSI operation.This reflective pixel electrode 15 has reflection and applies the function of voltage from the function of the light of transparency carrier 2 side incidents with to liquid crystal layer 4, and in order to improve reflectivity, also can be stacked on the Al film by the stratified film that the electrolyte catoptron is such.Have, the thickness of this reflective pixel electrode 15 is about 50～500nm again.
Then, between this reflective pixel electrode 15 and transparency electrode 6, insert liquid crystal layer 4 described later.In addition, on the mutual opposed opposed faces of above-mentioned transparency carrier 2 and drive circuit board 3, form the alignment films 17,18 of covering transparent electrode 6 and reflective pixel electrode 15 respectively.These alignment films 17,18 are orientated on the direction of regulation for the liquid crystal molecule 4a that makes liquid crystal layer 4, for example by constituting from the oblique electroplated film of tilted direction plating monox inorganic material such as (SiO) etc. and the polymeric membranes such as polyimide of having implemented milled processed from the teeth outwards with respect to above-mentioned silicon substrate.Have again, produce the direction and the angle control thereof of the pre-tilt of liquid crystal layer 4, under the former situation of oblique electroplated film, control the incident direction and the plating angle of this oblique plating, under the situation of the latter's polymeric membrane, control it and grind direction and condition thereof.
In the reflection type liquid crystal display element 1 of above such formation, pass through liquid crystal layer 4 on one side from the incident light of transparency carrier 2 side incidents, after being driven reflective pixel electrode 15 reflections of circuit board 3 sides on one side, as reflected light, on the direction opposite with incident light, by and penetrate liquid crystal layer 4 and transparency carrier 2.At this moment, liquid crystal layer 4 changes its optical characteristics according to the potential difference (PD) of the driving voltage that applies between transparency electrode 6 and the reflective pixel electrode 15, and the light that passes through is modulated.Therefore, in this reflection type liquid crystal display element 1, can carry out the tone demonstration that above-mentioned optical modulation produces, the reflected light of this modulation can be used for image and show.
; adjacent pixels 12a carries out under the situation of the big demonstration of white and the luminance difference of black in this reflection type liquid crystal display element 1; particularly in above-mentioned frame shape black display shown in Figure 9, carry out under the situation of white demonstration; in white shows; as shown in Figure 4, form two swing offset 19a, 19b that prolong along the border of black display from the bight that produces pre-tilt direction X.
Here, in reflection type liquid crystal display element 1, because four jiaos bight 16a, 16b, 16c, the 16d otch of the reflective pixel electrode 15 that rectangular arrangement is a plurality of, do not have acute angle portion by excising these bights 16a, 16b, 16c, 16d, thereby the direction that acts on the transverse electric field on this bight 16a, 16b, 16c, the 16d changes.
Specifically, reflective pixel electrode 15a in the bight that is arranged in the pre-tilt direction X that produces the white demonstration, as shown in Figure 3, by being positioned at the bight 16a otch that produces this pre-tilt direction X, do not have acute angle portion, the transverse electric field (representing with arrow among Fig. 3) that produces between bight 16b, the 16c of reflective pixel electrode 15b, the 15c adjacent with this bight 16a, 15d, 16d becomes and is producing approximate electric field on the pre-tilt direction X.That is, the unidirectional that enters the transverse electric field of this bight 16a improves.
In addition, by the bight 16a otch with this reflective pixel electrode 15a, reflective pixel electrode 15b, the 15c adjacent with this bight 16a, bight 16b, the 16c of 15d, the distance between the 16d are elongated, and the electric field intensity of crosstalking that cause the transverse electric field weakens.
Thus, in reflection type liquid crystal display element 1, the bight 16a that can be suppressed at the reflective pixel electrode 15a of the direction of orientation that is positioned at liquid crystal molecule 4a goes up the swing offset that produces distorted shape.That is, as shown in Figure 4, two swing offset 19a, 19b do not become and intersect in reflective pixel electrode 15a, respectively to being positioned at the shape that the bight 16a that produces pre-tilt direction X prolongs.Therefore, in this reflection type liquid crystal display element 1, can suppress to produce the swing offset of distorted shape, carry out the high excellent picture quality of reliability and show.
; in four jiaos bight 16a, 16b of reflective pixel electrode 15,16c, 16d; even except the bight 16a of the direction of orientation that is positioned at liquid crystal molecule 4a; also with remaining three bight 16b, 16c, 16d otch, can not think that the effect of the swing offset that suppresses above-mentioned distorted shape is big.That is, in this reflective pixel electrode 15, in four jiaos bight 16a, 16b of essentially rectangular, 16c, 16d, need be formed up to the shape of bight 16a otch that the major general is positioned at the direction of orientation of liquid crystal molecule 4a.In addition, by forming shape of otch all with four jiaos bight 16a, 16b of essentially rectangular, 16c, 16d, the transverse electric field that can weaken 15 of adjacent reflective pixel electrodes can suppress to produce swing offset most effectively.
In addition, as shown in Figure 3, reflective pixel electrode 15 preferably the incision length A of bight 16a, 16b, 16c, 16d with respect on one side length B below 1/8.This is because if bight 16a, 16b, 16c, the 16d of excessive excision reflective pixel electrode 15, and the space between the bight of adjacent reflective pixel electrode 15 is wide, then causes the decline of aperture opening ratio and the reflectivity of substantial pixel 12a.In addition, produce this part identified unfavorable condition on screen.In addition, if be below 1/10～1/20,, almost can ignore the decline of aperture opening ratio and reflectivity then with respect to existing square pixel with the ratio A/B of bight 16a, the 16b of reflective pixel electrode 15,16c, 16d otch.
Have again, reflective pixel electrode 15 is not limited to the shape with above-mentioned bight 16a, 16b, 16c, 16d linear incision, it for example also can be the shape of bight 16 being omited to approximate right angle to the inside L word shape ground otch shown in Fig. 5 A, shown in Fig. 5 B with the shape of bight 16 with the protruding laterally otch in curve ground, the kerf that curve ground, bight is protruding to the inside shown in Fig. 5 C etc.
Have, in above-mentioned Fig. 3, Fig. 4, reflective pixel electrode 15 shown in Figure 5, in order to understand feature easily, have to simplify and amplify the situation that expression becomes the part of feature, the dimension scale among the figure is not necessarily identical with reality.
Below, as adopting liquid crystal indicator of the present invention, the illustrative examples reflective liquid crystal projector 100 as shown in Figure 6.
This reflective liquid crystal projector 100 is liquid crystal indicators of porjection type, as so-called three plate modes, on three light valves corresponding, use above-mentioned reflection type liquid crystal display element 1, go up the coloured image that shows enlarging projection at screen (not shown) with the red, green, blue three primary colours.
Specifically, this reflective liquid crystal projector 100 comprises: the lamp 101 as light source that penetrates illumination light; To be separated into the look separation filters 102 and the dichronic mirror 103 as the color separation of dissociated optical parts of red light (R), green light (G), blue light (B) from the illumination light of lamp; R light valve 104R, G light valve 104G and B light valve 104B that red light (R), green light (G), blue light (B) after separating are modulated respectively and reflected as optical modulator component; With the synthetic prisms 105 that synthesizes of red light (R), green light (G), blue light (B) after the modulation as the synthesizing optical parts; And the illumination light after will synthesizing is incident upon the projection lens 106 of the conduct projection parts on the screen.
In addition, in the light path between the look separation filters 102 of lamp 101 and color separation, the fly lens 107 of the Illumination Distribution homogenising of the illumination light that configuration will be penetrated from lamp 101, with the polarization conversion device 108 of the P of illumination light, polarized component (for example S polarized component) that the S polarized component is transformed into a side, with the condenser 109 of illumination light optically focused etc.
The look separation filters 102 of color separation has the function that the white light from lamp 101 irradiations is separated into blue light (B) and other color of light (R, G), with the blue light (B) after separating and other color of light (R, G) oppositely reflection each other.
In addition, between the separation filters 102 and B light valve 104 of color separation, configuration is reflected completely reflecting mirror 110 from the blue light (B) that separates to B light valve 104, between the separation filters 102 and dichronic mirror 103 of color separation, other color of light that configuration will separate (R, G) are to the completely reflecting mirror 111 of dichronic mirror 103 reflections.
In addition, between each light valve 104R, 104G, 104B and synthetic prisms 105, configuration is with isolated each color of light R, G, B lead R, G, B polarization spectroscope 112R, 112G, the 112B of each light valve 104R, 104G, 104B respectively.These R, G, B polarization spectroscope 112R, 112G, 112B have the function that each color lights R, G, the B of incident is separated into P polarized component and S polarized component, make a polarized component (for example S polarized component) to R, G, B light valve 104R, 104G, 104B reflection, another polarized component (for example P polarized component) is seen through to synthetic prisms 105.
R, G, B light valve 104R, 104G, 104B form above-mentioned reflection type liquid crystal display element 1, the light of a polarized component (for example S polarized component) that will import by each polarization spectroscope 112R, 112G, 112B carries out Polarization Modulation according to picture signal, simultaneously with the light after this Polarization Modulation to each polarization spectroscope 112R, 112G, 112B reflection.
In above such reflective liquid crystal projector 100 that constitutes, the white light that penetrates from lamp 101 is separated into red light (R), green light (G), blue light (B) by the look separation filters 102 and the dichronic mirror 103 of color separation.These red light of separating (R), green light (G), blue light (B) are the light of S polarized component, incide each light valve 104R, 104G, 104B by each polarization spectroscope 112R, 112G, 112B.After inciding the red light (R) of each light valve 104R, 104B, 104G, green light (G), blue light (B) and being polarized modulation, to each polarization spectroscope 112R, 112G, 112B reflection according to the driving voltage on each pixel that is applied to each light valve 104R, 104G, 104B.And, these red light of modulating (R), green light (G), blue light (B) be light transmission each polarization spectroscope 112R, 112G, the 112B of P polarized component only, synthesize by synthetic prisms 105, the light after this is synthetic is incident upon on the screen by projection lens 106 amplifications.
As above, in this reflective liquid crystal projector 100, on screen, carry out coloured image by the pairing image enlarging projection of the light that light valve 104R, 104G, 104B were modulated and show.
In addition, when the above-mentioned reflection type liquid crystal display element 1 that constitutes above-mentioned each light valve 104R, 104G, 104B is zero at driving voltage, the illumination sample of the S polarized component of the incident light as the S polarized component is reflected.In this case, red light (R), green light (G), blue light (B) do not see through each polarization spectroscope 112R, 112G, 112B, carry out the so-called black display that is called as the standard black mode.In addition, in this reflection type liquid crystal display element 1, along with the rising of driving voltage, the light of the P polarized component by increasing Polarization Modulation rises transmitance.
As described above, in this reflective liquid crystal projector 100, by use above-mentioned reflection type liquid crystal display element 1 on each light valve 104R, 104G, 104B, the bight 16a that can be suppressed at the reflective pixel electrode 15a of the direction of orientation that is positioned at liquid crystal molecule 4a goes up the swing offset that produces distorted shape.Therefore, in this reflective liquid crystal projector 100, can carry out the high excellent picture quality of reliability and show.
[embodiment]
Below, the embodiment of actual fabrication reflection type liquid crystal display element of the present invention is described.In addition, the comparative example that is used for comparing embodiment and comparative example and makes is described.
In an embodiment, at first, make film forming the transparency electrode that constitutes by the ITO film glass substrate and formed the silicon substrate of the octagonal reflective pixel electrode that the Al film constitutes and cleaned after, use plating apparatus by oblique plating film forming SiO
2The alignment films that constitutes.Have again,,, make reflective pixel electrode form octagon-shaped by being that 0.6 μ m, pel spacing B+C are that 9 μ m, on one side length B are four bights otch point-blank of the square pixel of 8.4 μ m with pixel space C as above-mentioned shown in Figure 3.In addition, the length A with this bight otch is 0.5 μ m.The thickness of Al film is 150nm.The thickness of alignment films is 50nm, the plating angle of alignment films is controlled with 45 °～50 ° scopes, so that the pre-tilt angle of liquid crystal is about 3 °.In addition, direction (direction of orientation of the liquid crystal molecule) X that produces pre-tilt be reflective pixel electrode roughly to the angular direction.Then, the beaded glass with diameter 2 μ m between the two substrates that has formed alignment films scatters suitable number, and the encapsulant that uses the epoxy resin formation is at its end edge portion of state lower seal with the two substrates arranged opposite.Then, inject the nematic liquid crystal material with negative dielectric anisotropy of メ Le Network society system in inside, production unit thickness is the reflection type liquid crystal display element of 2 μ m.
＜comparative example 〉
In comparative example, except the length A that forms one side is the foursquare reflective pixel electrode of 8.4 μ m, similarly make with the reflection type liquid crystal display element of the foregoing description.
Then, the reflection type liquid crystal display element of the reflection type liquid crystal display element of these embodiment and the comparative example light valve as the reflective liquid crystal projector is used practically, on screen, carry out all black and show (driving voltage 0V), the swing offset that occurs in the bight of the direction X of the generation pre-tilt when in this black display, observing the white demonstration (driving voltage 4V) of carrying out 10 * 10 pixels.
In the reflective liquid crystal projector of the reflection type liquid crystal display element of the reflection type liquid crystal display element that uses comparative example, two swing offset lines that in white shows, occur prolonging along the border of black display and the swing offset of distorted shape the pixel that these two swing offset lines intersect from the bight of the direction X that produces pre-tilt.In addition, in the part of the swing offset that distorted shape occurs, can find out flicker, in 100 hours long-time driving, find out the ion burning phenomenon simultaneously.
On the contrary, in the reflective liquid crystal projector of the reflection type liquid crystal display element that uses embodiment, although two swing offset lines prolonging along the border of black display from the bight that produces pre-tilt direction X in white shows, occur, but in the pixel in the bight of the direction X that produces pre-tilt, the swing offset of the such distorted shape of comparative example does not appear.In addition, in this part, do not find out flicker, in 100 hours long-time driving, do not find out the ion burning phenomenon fully yet.
According to above situation, in adopting liquid crystal display cells of the present invention, can suppress to produce the swing offset of distorted shape, obtain significantly improving and long-term reliability of picture quality.
Have, because the aperture opening ratio of the reflection type liquid crystal display element of comparative example is 87%, the aperture opening ratio of the reflection type liquid crystal display element of embodiment is 86.5%, so the decline of aperture opening ratio almost can be ignored again.Even suppose that the length A otch with the bight of reflective pixel electrode is the situation of 1.1 μ m, its aperture opening ratio is 84%, the dropping to about 3% of aperture opening ratio, and the decline of reflectivity also is limited to about several %, can fully keep practicality.
Have, the liquid crystal display cells 1 of the reflection-type that the invention is not restricted to the light of incident modulated and penetrate as reflected light also is applicable to modulating from the light backlight that is disposed at the back side and as the liquid crystal display cells that sees through the infiltration type that light penetrates again.
In addition, the present invention is not limited to the such liquid crystal indicator that projects the porjection type on the screen of the above-mentioned reflective liquid crystal projector 100, also is widely used in the liquid crystal indicator that the direct viewing type of liquid crystal display cells of the present invention has been adopted in direct viewing.
As above detailed explanation, according to the present invention, in four jiaos bight of the essentially rectangular of rectangular a plurality of pixel electrodes arranged, be positioned at the bight otch of the direction of orientation of liquid crystal molecule to the major general, the bight that can be suppressed at the pixel electrode of the direction of orientation that is positioned at liquid crystal molecule produces the swing offset with complicated shape, can obtain significantly improving and long-term reliability of picture quality.
Claims (9)
1. liquid crystal display cells comprises:
Transparency carrier has transparency electrode and the alignment films that covers described transparency electrode;
Drive circuit board, have with opposed of described transparency electrode on rectangular a plurality of pixel electrodes arranged and the alignment films that covers described pixel electrode; And
Liquid crystal layer is interposed between the alignment films of the alignment films of described transparent substrate side and described drive circuit board side;
It is characterized in that:
Described alignment films makes the major axis of the liquid crystal molecule of described liquid crystal layer produce on the direction of regulation with respect to the pre-tilt angle of the normal slope of above-mentioned drive circuit board and is vertical orientated,
Described pixel electrode has in four jiaos bight of essentially rectangular, is positioned at the shape of bight otch of the direction of orientation of described liquid crystal molecule to the major general.
2. liquid crystal display cells as claimed in claim 1 is characterized in that, described pixel electrode has the roughly octagon-shaped with four jiaos bight otch of described essentially rectangular.
3. liquid crystal display cells as claimed in claim 1 is characterized in that, the incision length in the described bight of described pixel electrode is below 1/8 with respect to length on one side.
4. liquid crystal display cells as claimed in claim 1 is characterized in that, described pixel electrode reflection is from the light of described transparent substrate side incident.
5. a liquid crystal indicator uses the light by the liquid crystal display cells modulation to carry out the image demonstration, and wherein, described liquid crystal display cells comprises:
Transparency carrier has transparency electrode and the alignment films that covers described transparency electrode;
Drive circuit board, have with opposed of described transparency electrode on rectangular a plurality of pixel electrodes arranged and the alignment films that covers described pixel electrode; And
Liquid crystal layer is interposed between the alignment films of the alignment films of described transparent substrate side and described drive circuit board side;
It is characterized in that:
Described alignment films makes the major axis of the liquid crystal molecule of described liquid crystal layer produce on the direction of regulation with respect to the pre-tilt angle of the normal slope of above-mentioned drive circuit board and is vertical orientated,
Described pixel electrode has in four jiaos bight of essentially rectangular, and the shape of otch is arranged to the bight that the major general is positioned at the direction of orientation of described liquid crystal molecule.
6. liquid crystal indicator as claimed in claim 5 is characterized in that, described pixel electrode has the roughly octagon-shaped with four jiaos bight otch of described essentially rectangular.
7. liquid crystal indicator as claimed in claim 5 is characterized in that, the incision length in the described bight of described pixel electrode is below 1/8 with respect to length on one side.
8. liquid crystal indicator as claimed in claim 5 is characterized in that, described pixel electrode reflection is from the light of described transparent substrate side incident.
9. liquid crystal indicator as claimed in claim 5 is characterized in that, by being furnished with light source and will projecting projection parts on the screen from the light that passes through described liquid crystal display cells modulation that described light source penetrates, and constitutes the liquid crystal projector.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003190538A JP4029786B2 (en) | 2003-07-02 | 2003-07-02 | Liquid crystal display element and liquid crystal display device |
| JP190538/03 | 2003-07-02 | ||
| JP190538/2003 | 2003-07-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1576959A CN1576959A (en) | 2005-02-09 |
| CN100345032C true CN100345032C (en) | 2007-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100619395A Expired - Fee Related CN100345032C (en) | 2003-07-02 | 2004-06-29 | Liquid crystal display elements and liquid crystal display apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4029786B2 (en) |
| CN (1) | CN100345032C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4848701B2 (en) * | 2005-08-08 | 2011-12-28 | セイコーエプソン株式会社 | Manufacturing method of liquid crystal device |
| US8446350B2 (en) | 2008-03-25 | 2013-05-21 | Nikon Corporation | Liquid crystal panel, liquid crystal panel device, display device, and projector |
| CN102016704A (en) * | 2008-04-25 | 2011-04-13 | 夏普株式会社 | Liquid crystal display device |
| KR101518327B1 (en) * | 2008-07-24 | 2015-05-11 | 삼성디스플레이 주식회사 | Liquid crystal displayand panel therefor |
| JP2012215740A (en) * | 2011-04-01 | 2012-11-08 | Jvc Kenwood Corp | Projection type display device and image display element |
| US9235087B2 (en) * | 2013-06-27 | 2016-01-12 | Himax Display, Inc. | Active matrix structure and liquid crystal display panel |
| JP6673386B2 (en) | 2018-02-26 | 2020-03-25 | セイコーエプソン株式会社 | Electro-optical devices and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1211746A (en) * | 1997-08-29 | 1999-03-24 | 夏普公司 | Liquid crystal display device |
| CN1344964A (en) * | 2000-04-17 | 2002-04-17 | 精工爱普生株式会社 | Liquid crystal device, projecting display device and electronic equipment |
| JP2003043489A (en) * | 2001-07-12 | 2003-02-13 | Samsung Electronics Co Ltd | Vertcal aligned liquid crystal display and color filter substrate used for the same |
-
2003
- 2003-07-02 JP JP2003190538A patent/JP4029786B2/en not_active Expired - Fee Related
-
2004
- 2004-06-29 CN CNB2004100619395A patent/CN100345032C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1211746A (en) * | 1997-08-29 | 1999-03-24 | 夏普公司 | Liquid crystal display device |
| CN1344964A (en) * | 2000-04-17 | 2002-04-17 | 精工爱普生株式会社 | Liquid crystal device, projecting display device and electronic equipment |
| JP2003043489A (en) * | 2001-07-12 | 2003-02-13 | Samsung Electronics Co Ltd | Vertcal aligned liquid crystal display and color filter substrate used for the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4029786B2 (en) | 2008-01-09 |
| CN1576959A (en) | 2005-02-09 |
| JP2005024923A (en) | 2005-01-27 |
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