CN100410787C - Vertical nematic LCD device with multiple display zones by circular polarized light - Google Patents
Vertical nematic LCD device with multiple display zones by circular polarized light Download PDFInfo
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- CN100410787C CN100410787C CNB031205666A CN03120566A CN100410787C CN 100410787 C CN100410787 C CN 100410787C CN B031205666 A CNB031205666 A CN B031205666A CN 03120566 A CN03120566 A CN 03120566A CN 100410787 C CN100410787 C CN 100410787C
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Abstract
The present invention relates to a vertical nematic liquid crystal display with multiple display region. A common electrode is formed on a first surface of a first base board, and a pixel electrode which is corresponding to the common electrode is formed on a first surface of a second base board. Liquid crystal is sealed between the first base board and the second base board, and a display region regulating device is formed on the first base board or the second base board for regulating the liquid crystal direction of the liquid crystal. A first 1/4 wavelength phase difference board is arranged above a second surface of the first base board, and a first linear polarization board is arranged above the first 1/4 wavelength phase difference board. A second 1/4 wavelength phase difference board is arranged below a second surface of the second base board, and a second linear polarization board is arranged below the second 1/4 wavelength phase difference board.
Description
Technical field
The present invention relates to a kind of LCD, and particularly have relate to a kind of many display fields vertical orientation type that uses circularly polarized light (multi-domain vertical alignment, LCD MVA) (liquidcrystal display, LCD).
Background technology
MVA LCD is because it has the characteristic of wide viewing angle, in the attention that is subjected to market in recent years especially.With reference to Fig. 1, be the sectional view of the traditional MVA LCD of expression.Common electrode 102 is formed on the lower surface of upper substrate 104.And on the upper surface of infrabasal plate 108, then be formed with membrane transistor in order to control pixel electrode 110 (Thin Film Transistor, TFT) 112 with the capacitance electrode 116 of storage capacitors 114.The gate 118 of TFT 112 is covered by protective seam 120, and the source electrode 122 of TFT 112, drain electrode 124 are then covered by protective seam 125 with channel layer 126.Pixel electrode 110 then is that layer hole (the via hole) 128 that pass through that sees through on the protective seam 125 is electrically connected with the drain electrode 124 of TFT 112.Liquid crystal 128 then is sealed between upper substrate 104 and the infrabasal plate 108.
In addition, a plurality of projections 106 are formed on first of first up and down substrate 108 of upper substrate 104.And go up linear Polarizer 130 are the tops that are configured in an another side of upper substrate 104, and 132 of lower linear Polarizers are configured in the below of an another side of infrabasal plate 108.Going up linear Polarizer 130 is vertical mutually with the transmittance axle (tansmission axis) of lower linear Polarizer 132.
With reference to Fig. 2 A and Fig. 2 B, be to represent when LCD is dark attitude the side view of Liquid Crystal Molecules Alignment and top view.When not applying a voltage between common electrode 102 and the pixel electrode 110, most liquid crystal molecule 128A arranges with the direction perpendicular to substrate.And be positioned near the projection 106 liquid crystal molecule 128A, then be to arrange perpendicular to the mode on projection 106 surfaces.At this moment, after incident light passed lower linear Polarizer 132, the polarization direction of the electric field of incident light was parallel with the transmittance axle 204 of lower linear Polarizer 130, and vertical with the transmittance axle 202 of last linear Polarizer 130.So the time LCD be to be dark attitude.
With reference to Fig. 3 A, 3B and 3C, wherein, Fig. 3 A is the side view of expression Liquid Crystal Molecules Alignment when LCD is bright attitude, Fig. 3 B is the top view of expression Liquid Crystal Molecules Alignment under the perfect condition when LCD is bright attitude, and Fig. 3 C represents when LCD is bright attitude, the top view of the Liquid Crystal Molecules Alignment under the actual conditions.When applying specific voltage between common electrode 102 and pixel electrode 110 time, most liquid crystal molecule 128B arranges to be close to the direction that is parallel to substrate.Shown in Fig. 3 B, when the liquid crystal of liquid crystal molecule 128B points to the transmittance axle 202 of (Liquid Crystal Director) (direction of the major axis of liquid crystal molecule (Long Axis) just) and Polarizer or 204 angles is 45 when spending, and maximum light transmission Tmax is arranged.Yet actual situation is, shown in Fig. 3 C, be not the liquid crystal of all liquid crystal molecule the transmittance axle 202 or 204 angles that point to all with Polarizer be 45 degree, the liquid crystal sensing of liquid crystal molecule and transmittance axle 204 angles of Polarizer
May for 0 the degree to 90 the degree.Work as angle
Non-is 45 when spending, and will make light transmission reduce.
With reference to Fig. 4, be the liquid crystal sensing of expression liquid crystal molecule and the transmittance axle clamp angle of Polarizer
Graph of a relation with light transmission T.Work as angle
When spending near 0 degree or 90, light transmission T will be close in minimum value Tmin.So, when LCD during in bright attitude, angle
The liquid crystal molecule of non-45 degree will make incident light can't reach maximum transmission rate, so traditional LCD can't reach the highest light utilization efficiency.
Moreover traditional LCD is to have the too little problem in visual angle.With reference to Fig. 5 A and Fig. 5 B, wherein, Fig. 5 A is the relation of expression direction of observation (view direction) Φ and viewing angle Ψ and panel, and Fig. 5 B then is the contrast contour map (contrast contourline) of traditional MVA LCD of presentation graphs 1.The subpoint of observation point P on panel 502 is to be P ' point.Direction of observation Φ is, the subpoint P ' angle with the transmittance axle 204 of polaroid, and viewing angle Ψ is the angle for the planar process vector 506 of observation point P and panel 502.And the definition of visual angle (view angle) is the viewing angle Ψ that correlative value equaled 10 o'clock.For each direction of observation Φ, its pairing visual angle is inequality.By Fig. 5 B as can be known, when direction of observation be that 45 degree, 135 degree, 225 degree and 315 are when spending, because there is the situation of light leak to produce when dark attitude, so correlative value is lower.Therefore, direction of observation is 45 degree, 135 degree, the visual angle minimum (shown in the dotted line arrow) when 225 degree and 315 are spent.Because the amount difference of the light leak of different wave length, so the situation of light leak also will cause the phenomenon of color displacement (color shift) simultaneously.
Therefore, the light utilization efficiency that how to improve conventional liquid crystal is not high, and is 45 degree, 135 degree, 225 degree and 315 when spending in direction of observation, the problem of the less than normal and color displacement in visual angle, to improve the display efficiency and the display quality of LCD, be instant problem.
Summary of the invention
In view of this, purpose of the present invention is exactly that a kind of LCD of using many display fields vertical orientation type of circularly polarized light is being provided, and this LCD can improve light utilization efficiency, has with great visual angle, and solves the problem of traditional color displacement.
According to purpose of the present invention, a kind of LCD of many display fields vertical orientation type is proposed, this LCD comprises: one first substrate and one second substrate; One is formed on the common electrode on one first of this first substrate; One one first of being formed on this second substrate goes up and the pixel electrode relative with this common electrode; One is sealed in the liquid crystal between this first substrate and this second substrate; The one display field adjusting gear that is formed on this first substrate or this second substrate and points in order to the liquid crystal of adjusting this liquid crystal; One is configured in the first quarter-wave polarizer of one second top of this first substrate; One is configured in the first linear Polarizer of the top of this first quarter-wave polarizer; One is configured in the second quarter-wave polarizer of one second below of this second substrate; And second a linear Polarizer that is configured in the below of this second quarter-wave polarizer; Wherein, be incident to the light of this LCD this liquid crystal of form transmission with circularly polarized light.
The LCD of many display fields vertical orientation type of the present invention also can comprise 1/1st a wavelength polarizer and a negative value polarizer./ 2nd wavelength polarizers are to be configured in this first linear Polarizer therewith between the first quarter-wave polarizer, or are configured in this second linear Polarizer therewith between the second quarter-wave polarizer.The negative value polarizer then is to be configured in this first substrate therewith between the first quarter-wave polarizer, or this second substrate is therewith between the second quarter-wave polarizer.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and in conjunction with the accompanying drawings, be described in detail below:
Description of drawings
Fig. 1 is the sectional view of the traditional MVA LCD of expression.
Fig. 2 A and Fig. 2 are the side view and the top views of expression Liquid Crystal Molecules Alignment when LCD is dark attitude.
Fig. 3 A is the side view of expression Liquid Crystal Molecules Alignment when LCD is bright attitude.
Fig. 3 B is expression top view of Liquid Crystal Molecules Alignment under the perfect condition when LCD is bright attitude.
Fig. 3 C is expression top view of Liquid Crystal Molecules Alignment under the actual conditions when LCD is bright attitude.
Fig. 4 is the liquid crystal sensing of expression liquid crystal molecule and the transmittance axle clamp angle of Polarizer
Graph of a relation with light transmission T.
Fig. 5 A is the relation of expression direction of observation (view direction) Φ and viewing angle Ψ and panel.
Fig. 5 B then is the contrast contour map (contrast contourline) of traditional MVA LCD of presentation graphs 1.
Fig. 6 A is the side view of expression according to a kind of MVA LCD of a preferred embodiment of the present invention.
Fig. 6 B is the relation of the transmittance axle of the last linear polarizer plate among the presentation graphs 6A and the slow axis of last quarter-wave polarizer (Slow Axis).
Fig. 6 C is the relation of transmittance axle with the slow axis of following quarter-wave phase difference plate of the lower linear polaroid among the presentation graphs 6A.
Fig. 7 a is expression when being bright attitude according to the MVA LCD of the preferred embodiment of the present invention shown in Fig. 6 A, the top view of Liquid Crystal Molecules Alignment.
Fig. 7 B is that the liquid crystal of the liquid crystal molecule of presentation graphs 7A points to and the transmittance axle clamp angle of Polarizer
Graph of a relation with light transmission T.
Fig. 8 A is that expression becomes the angle that points to liquid crystal to be the directions X electric field Ex of 45 degree and the synoptic diagram of Y direction electric field Ey at the direction of an electric field that different liquid crystal molecules decompose circularly polarized light with Fig. 8 B.
Fig. 9 be the travel direction of expression incident light when facing panel and looking side ways panel and liquid crystal molecule refractive index difference Δ n concern synoptic diagram.
Figure 10 is the synoptic diagram that expression uses the negative value polarizer to compensate.
Figure 11 A～11C is the configuration schematic diagram of expression negative value polarizer of the present invention.
Figure 12 A and 12B are to be respectively the angle of the transmittance axle of expression two linear Polarizers that the observer is seen when facing panel with the stravismus panel.
Figure 13 is the synoptic diagram of expression 1/2nd wavelength polarizers used in the present invention.
Figure 14 A～14C is the configuration schematic diagram of expression 1/2nd wavelength polarizers of the present invention.
Figure 15 is the sectional view of the MVA LCD of the present invention after expression combines with quarter-wave polarizer, negative value polarizer, with 1/2nd ripples and polarizer.
Embodiment
In order to solve the not high problem of traditional light utilization efficiency, the present invention discloses a kind of MVA LCD that uses circularly polarized light.The present invention is by adding two quarter-wave polarizers (quarter-waveplate, i.e.1/4 λ plate), cooperating original linear Polarizer, so that incident light transmits in liquid crystal with the form of circularly polarized light.By using circularly polarized light, can effectively improve the light utilization efficiency of MVA LCD.
With reference to Fig. 6 A, 6B and 6C, wherein, Fig. 6 A is the side view of expression according to a kind of MVA LCD of a preferred embodiment of the present invention, Fig. 6 B is the transmittance axle of the last linear polarizer plate among the presentation graphs 6A, relation with the slow axis (Slow Axis) of last quarter-wave polarizer, and Fig. 6 C is the transmittance axle of the lower linear polaroid among the presentation graphs 6A, with the relation of the slow axis of following quarter-wave polarizer.Be to be formed with community electrode (being not to be shown among Fig. 6 A) on one first of upper substrate 604, last quarter-wave polarizer 640 then is one second the top that is configured in upper substrate 604, and upper substrate 604 and between the linear Polarizer 630.Be to be formed with a pixel electrode (being not to be shown among Fig. 6 A) on one first of infrabasal plate 608, following quarter-wave polarizer 642 then is one second the below that is configured in infrabasal plate 604, and between infrabasal plate 608 and lower linear Polarizer 632.
Wherein, shown in Fig. 6 B, the slow axis 640A of last quarter-wave polarizer 640 spends with the transmittance axle 630A angle 45 of last linear Polarizer 630.The slow axis 642A of following quarter-wave polarizer 642 spends with the transmittance axle 632A angle 45 of lower linear Polarizer 632.The two is to form a dextrorotation rotatory polarization sheet for last quarter-wave polarizer 640 and last linear Polarizer 630, and down quarter-wave polarizer 642 and lower linear Polarizer 632 the two be to form a left-handed rotatory polarization sheet.
When not applying a voltage between common electrode and the pixel electrode, the liquid crystal electron major part is to arrange with the direction perpendicular to substrate.At this moment, after incident light transmission lower linear polaroid 632 and following quarter-wave polarizer 642, this incident light is to become left circularly polarized light.Liquid crystal molecule perpendicular to substrate is to can be considered transparent, and incident light is not produced any effect.Afterwards, run into when going up the formed dextrorotation rotatory polarization sheet of quarter-wave polarizer 640 and last linear Polarizer 630 when left circularly polarized light, light can't pass through.So this moment, MVA LCD was dark attitude.
When applying specific voltage after common electrode and pixel electrode, most liquid crystal molecule is to arrange to be close to the direction that is parallel to substrate.After incident light passed lower linear polaroid 632 and following quarter-wave polarizer 643, this incident light was to become left circularly polarized light.This left circularly polarized light in by be close to be parallel to the liquid crystal molecule of substrate after, will be transformed into right-circularly polarized light, with by by last quarter-wave polarizer 640 and last linear Polarizer 630 formed dextrorotation rotatory polarization sheets.So the MVA LCD of this moment is bright attitude.
Know clearly it, with reference to Fig. 7 A and Fig. 7 B, wherein, Fig. 7 A is that expression is when being bright attitude according to the MVA LCD of the preferred embodiment of the present invention shown in Fig. 6 A, the top view of Liquid Crystal Molecules Alignment, and Fig. 7 B to be the liquid crystal of the liquid crystal molecule of presentation graphs 7A point to and the transmittance axle 630A angle of Polarizer
Graph of a relation with light transmission T.After incident light passed lower linear polaroid 632 and following quarter-wave polarizer 642, this incident light was to become left circularly polarized light, and the phase differential of the directions X electric field Ex of left circularly polarized light and Y direction electric field Ey is 90 degree.Pass through after the effect of the liquid crystal with phase difference value (Retardation) Δ nd, the phase differential of directions X electric field Ex and Y direction electric field Ey will change 270 degree into, and make incident light be transformed into right-circularly polarized light.Because no matter why the liquid crystal of liquid crystal molecule points to, the direction of an electric field of circularly polarized light all can resolve into directions X electric field Ex and the Y direction electric field Ey (supposing that incident light is to advance along the Z direction) that the angle that points to liquid crystal is 45 degree, shown in Fig. 8 A and Fig. 8 B, so can learn, no matter why the liquid crystal of liquid crystal molecule points to, the size of the phase difference value that the directions X electric field Ex and the Y direction electric field Ey of incident light corresponded to is the same.For instance, the liquid crystal molecule 628A of pairing angle 45 degree of incident light is the same with the phase difference value of the liquid crystal molecule 628B of angle 90 degree.So, no matter angle
Much, the light transmission of incident light all is light transmission Tmax.So, compare with conventional practice, the present invention can reach the purpose that promotes light utilization efficiency in fact.
In addition, the present invention more makes 1/1st a wavelength polarizer and a negative value polarizer, solves traditional because light leak, and the too little problem with color displacement in the visual angle that produces.
Generally speaking, LCD is when dark attitude, and the reason that produces light leak mainly contains 2 points.First point, when facing panel with the stravismus panel, it is different with difference (difference in refractive index between the long and shortaxes) the Δ n of the refractive index of minor axis that the light that the observer saw is distinguished the major axis of corresponding liquid crystal molecule.Second point, when facing panel with the stravismus panel, the angle of the transmittance axle of viewed two the linear Polarizers of observer is to be difference, so it also is different to forward with the effect of oblique incidence light.The present invention be directed to this two factors, solve the problem of light leak and color displacement respectively.
Now reason and the settling mode at first light leak is described in detail as follows.With reference to Fig. 9, be expression when facing panel and looking side ways panel, the refractive index difference Δ n of the travel direction of incident light and liquid crystal molecule concerns synoptic diagram.When facing panel, the refractive index difference Δ n1 of the pairing liquid crystal 628 of incident light equals zero, and when stravismus during panel, the refractive index difference of the pairing liquid crystal 628 of incident light be equal one on the occasion of, suppose to equal Δ n2.In order to make forward identical with the pairing refractive index difference of oblique incidence light, the present invention has been to use a negative value polarizer (Negtive C-plate) to compensate.By using the negative value polarizer, the pairing equivalent refractive index difference of oblique incidence light is equated with the pairing refractive index difference of forward entrance light, that is be equal to zero.
With reference to Figure 10, be the synoptic diagram that expression uses the negative value polarizer to compensate.The C axle of negative value polarizer 1002 (C Axis) is to arrange along the Z direction.When incident light during along the C axle incident of negative value polarizer 1002, the refractive index difference Δ n1 ' of the pairing negative value polarizer 1002 of incident light equals zero.And when incident light oblique incidence during to negative value polarizer 1002, the refractive index difference of the pairing negative value polarizer 1002 of incident light is to equal a negative value, supposes to equal Δ n2 '.In order to reach purpose of the present invention, the absolute value of Δ n2 ' will be designed to equate with the absolute value of the refractive index difference Δ n2 of the pairing liquid crystal 628 of oblique incidence light.So, when oblique incidence light through after negative value polarizer 1002 and the liquid crystal 628, its pairing equivalent refractive index difference will equal the refractive index difference Δ n2 ' sum of refractive index difference Δ n2 and the negative value polarizer of liquid crystal, its value is zero.So, owing to the pairing equivalent refractive index difference of oblique incidence light equates with the pairing refractive index difference of forward entrance light, so, cause first reason of light leak to be solved.
With reference to Figure 11 A～11C, be the configuration schematic diagram of expression negative value polarizer of the present invention.Shown in Figure 11 A, negative value polarizer 1002 is configurable above second of upper substrate 604, and between upper substrate 604 and last quarter-wave polarizer 640.And for example shown in Figure 11 B, negative value polarizer 1002 is also configurable below second of infrabasal plate 608, and between infrabasal plate 608 and following quarter-wave polarizer 642.For another example shown in Figure 11 C, negative value polarizer 1002 also can come equivalence by two negative value polarizer 1002A and 1002B, negative value polarizer 1002A is configured between quarter-wave polarizer 640 and the upper substrate 604, and negative value polarizer 1002B is configured in down between quarter-wave polarizer 642 and the infrabasal plate 608.For oblique incidence light, the refractive index difference sum of negative value polarizer 1002A and 1002B is to equal Δ n2 '.Wherein, above-mentioned Δ n2 and Δ n2 ' value will be along with the different incident angles of oblique incidence light, and correspond to different values.
Now reason and the settling mode at second above-mentioned light leak is described in detail as follows.With reference to Figure 12 A and Figure 12 B, it is respectively to represent when facing panel with the stravismus panel angle of the transmittance axle of two linear Polarizers that the observer saw.Shown in Figure 12 A, when facing panel, the angle of the transmittance axle of two linear Polarizers that the observer saw is for 90 degree, so, when dark attitude, will not have the situation of light leak.But shown in Figure 12 B, when stravismus during panel, the angle of the transmittance axle of two linear Polarizers that the observer saw is greater than 90 degree, and so, when dark attitude, the situation that will have light leak produces.
Are problems of the light leak that produced greater than 90 degree at the angle of the transmittance axle of two linear Polarizers, the present invention has used 1/2nd wavelength polarizers (half-wave plate, i.e.1/2 λ plate) to compensate it.With reference to Figure 13, be the synoptic diagram of expression 1/2nd wavelength polarizers used in the present invention.One of them characteristic of 1/2nd wavelength polarizers used in the present invention is that forward entrance light and oblique incidence light pairing phase difference value in 1/2nd wavelength polarizers 1302 is to equal zero.When incident light 1304 during from the side forward entrance of 1/2nd wavelength polarizers 1302, its pairing refractive index difference Δ n " is to equal zero.When incident light 1306 during, the refractive index difference Δ n1 that it is seen from the top forward entrance of 1/2nd wavelength polarizers 1302 " be for one on the occasion of.And when incident light 1308 during from the top oblique incidence of 1/2nd wavelength polarizers 1302, its refractive index difference Δ n2 that sees " be for less than Δ n1 " on the occasion of.Wherein, the path that incident light 1306 is advanced in 1/2nd wavelength polarizers 1302 is to be d1, and the path that incident light 1308 is advanced in 1/2nd wavelength polarizers 1302 is to be d2, and d1 is less than d2./ 2nd wavelength polarizers 1302 of the present invention are to be designed to, and allow the value of Δ n1 " value of * d1 equals Δ n2 " * d2, that is, allow forward entrance light 1306 equate with oblique incidence light 1308 pairing phase differential in 1/2nd wavelength polarizers 1302.
In addition, carry out learning behind the computer simulation according to using numerical method, when the NZ coefficient (NZ factor) of 1/2nd wavelength polarizers greater than 0.4, less than 0.6 o'clock, the angle that can solve the transmittance axle of two linear Polarizers effectively was to spend the problem of second light leak that is produced greater than 90.Especially when the NZ coefficient equaled 0.5, the effect that is produced was more remarkable.Wherein, the NZ coefficient is defined as, and NZ=(nx-nz)/(nx-ny), nx, ny and nz are respectively the refractive index of 1/2nd wavelength polarizers in X, Y and Z direction.
With reference to Figure 14 A～14C, be the configuration schematic diagram of expression 1/2nd wavelength polarizers of the present invention.Shown in Figure 14 A, 1/2nd wavelength polarizers 1302 are configurable between last linear Polarizer 630 and last quarter-wave polarizer 640.Again as shown in Figure 14B, 1/2nd wavelength polarizers 1302 are configurable between lower linear Polarizer 632 and following quarter-wave polarizer 642.For another example shown in Fig. 1 C, what 1/2nd wavelength polarizers 1302 more can be by two 1/ 2nd wavelength polarizer 1302A and 1302B equivalence./ 2nd wavelength polarizer 1302A are configured between linear Polarizer 630 and the quarter-wave polarizer 640, and 1/2nd wavelength polarizer 1302B are configured between lower linear Polarizer 632 and the following quarter-wave polarizer 642.The NZ coefficient sum of/ 2nd wavelength polarizer 1302A and 1302B is greater than 0.4, and less than 0.6.Preferably, the NZ coefficient sum of 1/ 2nd wavelength polarizer 1302A and 1302B is to equal 0.5.
Wherein, the slow axis of 1/2nd wavelength polarizers 1302 is the transmittance axles that can be parallel to linear Polarizer 630, or is parallel to the transmittance axle of lower linear Polarizer 632.
Because the problem of color displacement is to result from the incident light of different colours, the degree difference of light leak.So after the problem of 2 above-mentioned light leaks solved, the problem of color displacement also solved thereupon.
After combining with above-mentioned quarter-wave polarizer, negative value polarizer, with 1/2nd wavelength polarizers, can obtain the sectional view of MVA LCD as shown in figure 15.Common electrode 1502 is formed on the lower surface of upper substrate 604.Pixel electrode 1510 is formed on the upper surface of infrabasal plate 608, and relative with common electrode 1502.Liquid crystal 628 is to be sealed between upper substrate 604 and the infrabasal plate 608.One display field adjusting gear 1506 is formed on upper substrate 604 or the infrabasal plate 608, points in order to the liquid crystal of adjusting this liquid crystal.Wherein, this display field adjusting gear 1506 for example is a projection.
Last quarter-wave polarizer 640 is the tops that are configured in the upper surface of upper substrate 604.Going up 630 of linear Polarizers is the top that is configured in the quarter-wave polarizer.Following quarter-wave polarizer 632 is the belows that are configured in the lower surface of infrabasal plate.The lower linear Polarizer then is the below that is configured in down the quarter-wave polarizer./ 2nd wavelength polarizers 1302 are to be configured between lower linear Polarizer 632 and the following quarter-wave polarizer, and negative value polarizer 1002 is to be configured between upper substrate 604 and the last quarter-wave polarizer 640.
Though in Figure 15, be to be to be configured between lower linear Polarizer 632 and the following quarter-wave polarizer with 1/2nd wavelength polarizers 1302, negative value polarizer 1002 is to be configured between upper substrate 604 and the last quarter-wave polarizer 640 to do explanation for example.Natch, as indicated above, 1/2nd wavelength polarizers 1302 are also configurable between last linear Polarizer 630 and last quarter-wave polarizer 640.And negative value polarizer 1002 is also configurable between infrabasal plate 608 and following quarter-wave polarizer 642.In addition, as indicated above, 1/2nd wavelength polarizers 302 can come equivalence by two 1/2nd wavelength polarizers, and the negative value polarizer also can come equivalence by two negative value polarizers.Wherein, being incident to the light of LCD of the present invention, is the form with circularly polarized light, transflective liquid crystal 628.
According to spirit of the present invention, the display field adjusting gear 1506 of the LCD that the present invention was suitable for can also be become to reach except can being reached by projection by other forms.For example be to use groove, or the cone-shaped body projection, or the form that groove cooperates with projection is reached.As long as can make liquid crystal molecule reach the display field adjusting gear of distribution of many display fields all applicable among the present invention.
In addition, when the NZ of quarter-wave polarizer used in the present invention value greater than 0.4 less than 0.6 the time, can reach good effect, especially equal at 0.5 o'clock, effect is better.
The LCD of many display fields vertical orientation type of the disclosed use circularly polarized light of the above embodiment of the present invention can improve light utilization efficiency, has with great visual angle, and solves the problem of traditional color displacement.
In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention should be with being as the criterion that claims scope is defined.
The drawing reference numeral explanation
102,1502: common electrode
104,604: upper substrate
106: projection
108,608: infrabasal plate
110,1510: pixel electrode
112: membrane transistor
114: storage capacitors
116: capacitance electrode
118: gate
120: protective layer
122: source electrode
124: drain electrode
125: protective layer
126: channel layer
127: interlayer hole
128,628: liquid crystal
128A, 628A, 628B: liquid crystal molecule
130,630: the Linear Polarizer
132,632: the lower linear Polarizer
202,204,630A, 632A: the light axis of homology
502: panel
506: the planar process vector
640: go up the quarter-wave polarizer
642: following quarter-wave polarizer
640A, 642A: slow axis
1002,1002A, 1002B: negative value polarizer
1302,1302A, 1302B: 1/2nd wavelength polarizers
1304,1306,1308: incident light
1506: the display field adjusting gear
Claims (12)
1. the LCD of the type of display field vertical orientation more than a kind comprises:
One first substrate and one second substrate;
One is formed on the common electrode on one first of this first substrate;
One one first of being formed on this second substrate goes up and the pixel electrode relative with this common electrode;
One is sealed in the liquid crystal between this first substrate and this second substrate;
The one display field adjusting gear that is formed on this first substrate or this second substrate and points in order to the liquid crystal of adjusting this liquid crystal;
One is configured in the first quarter-wave polarizer of one second top of this first substrate;
One is configured in the first linear Polarizer of the top of this first quarter-wave polarizer;
One is configured in the second quarter-wave polarizer of one second below of this second substrate; And
One is configured in the second linear Polarizer of the below of this second quarter-wave polarizer;
One negative value polarizer, described negative value polarizer is configured between this first substrate and this first quarter-wave polarizer, or be configured between this second substrate and this second quarter-wave polarizer, oblique incidence light corresponding refractive index difference and oblique incidence light refractive index difference opposite in sign and absolute value in liquid crystal in the negative value polarizer equated
Wherein, be incident to the light of this LCD this liquid crystal of form transmission with circularly polarized light.
2. LCD as claimed in claim 1, it is characterized in that: the transmission axle clamp miter angle of the slow axis of this first quarter-wave polarizer and this first linear Polarizer, and the slow axis of this second quarter-wave polarizer is the transmission axle clamp miter angle with this second linear Polarizer.
3. LCD as claimed in claim 1, it is characterized in that: also comprise 1/1st wavelength polarizer, described 1/2nd wavelength polarizers are to be configured between this first linear Polarizer and this first quarter-wave polarizer, or be configured between this second linear Polarizer and this second quarter-wave polarizer, make forward entrance light and oblique incidence light corresponding phase differential in this 1/2nd wavelength polarizer equate.
4. LCD as claimed in claim 3 is characterized in that: the NZ coefficient of this 1/2nd wavelength polarizer is greater than 0.4, and less than 0.6.
5. LCD as claimed in claim 4 is characterized in that: the NZ coefficient of this 1/2nd wavelength polarizer is to equal 0.5.
6. LCD as claimed in claim 3 is characterized in that: the slow axis of this 1/2nd wavelength polarizer is the transmittance axle that can be parallel to this first linear Polarizer, or is parallel to the transmittance axle of this second linear Polarizer.
7. LCD as claimed in claim 1, it is characterized in that also comprising one the 1/1st wavelength polarizer and one the 1/2nd wavelength polarizer, the 1/1st wavelength polarizer is to be configured between this first linear Polarizer and this first quarter-wave polarizer, and the 1/2nd wavelength polarizer is to be configured between this second linear Polarizer and this second quarter-wave polarizer, the NZ coefficient sum of the 1/1st wavelength polarizer and the 1/2nd wavelength polarizer is greater than 0.4, and less than 0.6.
8. LCD as claimed in claim 7 is characterized in that: the NZ coefficient sum of the 1/1st wavelength polarizer and the 1/2nd wavelength polarizer is to equal 0.5.
9. LCD as claimed in claim 1 is characterized in that: the NZ coefficient of this first quarter-wave polarizer and this second quarter-wave polarizer is all greater than 0.4 and less than 0.6.
10. LCD as claimed in claim 9 is characterized in that: the NZ coefficient of this first quarter-wave polarizer and this second quarter-wave polarizer is to be equal to 0.5.
11. LCD as claimed in claim 1 is characterized in that: the oblique refractive index difference of this negative value polarizer equals the negative value of the oblique refractive index difference of this liquid crystal.
12. LCD as claimed in claim 1, it is characterized in that: comprise one first negative value polarizer and one second negative value polarizer, this first negative value polarizer is to be configured between this first substrate and this first quarter-wave polarizer, and this second negative value polarizer is to be configured between this second substrate and this second quarter-wave polarizer, for oblique incidence light, the refractive index difference sum of this first negative value polarizer and this second negative value polarizer is the negative value that equals the oblique refractive index difference of this liquid crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031205666A CN100410787C (en) | 2003-03-14 | 2003-03-14 | Vertical nematic LCD device with multiple display zones by circular polarized light |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031205666A CN100410787C (en) | 2003-03-14 | 2003-03-14 | Vertical nematic LCD device with multiple display zones by circular polarized light |
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| CN1530720A CN1530720A (en) | 2004-09-22 |
| CN100410787C true CN100410787C (en) | 2008-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031205666A Expired - Fee Related CN100410787C (en) | 2003-03-14 | 2003-03-14 | Vertical nematic LCD device with multiple display zones by circular polarized light |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4801363B2 (en) * | 2005-03-25 | 2011-10-26 | スタンレー電気株式会社 | Liquid crystal display element |
| JP2006309105A (en) | 2005-03-30 | 2006-11-09 | Casio Comput Co Ltd | Liquid crystal display device |
| CN102047589A (en) * | 2007-10-11 | 2011-05-04 | 阿尔卑斯电气株式会社 | Information terminal equipment |
| CN102707518B (en) * | 2012-05-24 | 2014-10-29 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and display device thereof |
| CN104765200B (en) * | 2015-05-06 | 2017-12-05 | 京东方科技集团股份有限公司 | Display panel and display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000171789A (en) * | 1997-12-25 | 2000-06-23 | Toshiba Corp | Display element |
| CN1381757A (en) * | 2001-04-16 | 2002-11-27 | 日东电工株式会社 | Optical device and liquid crystal display unit |
| CN1397809A (en) * | 2001-07-17 | 2003-02-19 | 日东电工株式会社 | Circular polarizing disk and liquid crystal display |
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- 2003-03-14 CN CNB031205666A patent/CN100410787C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000171789A (en) * | 1997-12-25 | 2000-06-23 | Toshiba Corp | Display element |
| CN1381757A (en) * | 2001-04-16 | 2002-11-27 | 日东电工株式会社 | Optical device and liquid crystal display unit |
| CN1397809A (en) * | 2001-07-17 | 2003-02-19 | 日东电工株式会社 | Circular polarizing disk and liquid crystal display |
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| CN1530720A (en) | 2004-09-22 |
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