CN1908773A - Liquid crystal display device - Google Patents
Liquid crystal display device Download PDFInfo
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- CN1908773A CN1908773A CN 200510091915 CN200510091915A CN1908773A CN 1908773 A CN1908773 A CN 1908773A CN 200510091915 CN200510091915 CN 200510091915 CN 200510091915 A CN200510091915 A CN 200510091915A CN 1908773 A CN1908773 A CN 1908773A
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- liquid crystal
- compensate film
- orientation
- light valve
- orientation angle
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Abstract
The related LCLV comprises: a TN liquid crystal layer with front and back crystal arranged as the first and second direction by 70-110deg included angle, a first and second compensation film on the front and back of last layer, a first/second PVA film on the front/back of the first/second compensation film, and the first/second polarized light absorption shaft on PVA film with included angle to the first/second arranged direction as -20-20deg/70-110deg, and the slow shaft on first/second compensation film with included angle to the first/second arranged direction as 70-110deg/-20-20deg.
Description
Technical field
The present invention is relevant with a LCD, and is especially relevant with the LCD of a kind of application stable twisted nematic (TN) liquid crystal material.
Background technology
LCD is one of the fastish plane of development in recent years display technique.Since LCD compared to traditional cathode ray tube (CRT) display have more gently, thin, short, little characteristic, make the application of LCD, extensive more than CRT monitor.For example, at the monitor of TV, desktop computer and notebook computer etc., can see the embodiment that uses LCD.Yet, form the critical material-liquid crystal of LCD because the influence of its material character makes lcd technology still have problems such as brightness, color contrast, answer speed and visual angle compared to CRT monitor.Yet, under the demand of huge market, during many technical bottlenecks that caused because of liquid crystal material character are improved just step by step.
Stable twisted nematic (TN) LCD is a common lcd technology, and it is used in the liquid crystal display systems of notebook computer or small-medium size more.Compared to the LCD of other types, stable twisted nematic (TN) LCD has that processing procedure is simple, low price and carry out advantage such as optical compensation easily.See also Fig. 1, it is the TN type liquid crystal light valve structure of tradition collocation optical compensation films, by observer 1 ' to the backlight assembly 2 ' of bottom, this liquid crystal light valve comprises one the one PVA film 101 ' in regular turn, one first compensate film 102 ', one liquid crystal layer 300 ', one second compensate film 202 ', one the 2nd PVA film 201 ', wherein the front side of this liquid crystal layer 300 ' (near observer's a side) 301 ' and the LCD alignment of rear side (near a side of backlight assembly) 302 ' are pointed to the upper right side of this display and lower right side respectively (as the arrow direction A ' among the figure, B '), the one PVA film and the 2nd PVA film 101 ', polarized light absorption direction of principal axis on 201 ' is parallel with the LCD alignment direction of this liquid crystal layer front side 301 ' and this liquid crystal layer rear side 302 ' respectively (as the arrow direction C ' among the figure, D '), and the slow axis (the refractive index maximum on the plane) on first compensate film, the 102 ' plane of position between a PVA film 101 ' and this liquid crystal layer 300 ' is and this first orientation (as the arrow direction E ' among the figure) parallel to each other, and the slow axis on second compensate film, the 202 ' plane between the 2nd PVA film 201 ' and this liquid crystal layer 300 ' is and this second orientation direction parallel to each other (as the arrow direction F ' among the figure).By such textural association, this type of TN type LCD can make the visual angle of this display can obtain effective improvement.
Yet LCD has different performance requirements at different application; For example, for the display system of desktop computer or notebook computer, the visual angle that increases and arranged on left and right sides is not to be an important performance requirement; On the contrary, Duo Shuo user more wishes to dwindle left and right sides angular field of view and spies on the data on the screen from both sides to prevent the people.And on the other hand, in the practical application of LCD, regular meeting is because the influence of envoy's height, use place or height of table top, and make the user to watch LCD with a specific upper and lower visual angle, yet, not through producing phenomenons such as gray-scale inversion and chromaticity distortion on the upper and lower visual angle of LCD screen regular meeting in LCD screen of optical compensation, cause the very big inconvenience of user; And add the TN type LCD of optical compensation films, because its usefulness mainly is the visual angle about being to increase, therefore under the angle at upper and lower visual angle changes, also can't effectively improve the phenomenon of gray-scale inversion.
Comprehensive above-described reason, in order effectively to improve the demonstration usefulness of display screen (for example screen of notebook computer) on upper and lower visual angle that the individual uses, therefore the present invention proposes the light valve structure of the liquid crystal of phenomenons such as a kind of gray-scale inversion of improving the upper and lower visual angle of display and chromaticity distortion.
Summary of the invention
The present invention proposes a kind of liquid crystal light valve, it comprises: a stable twisted nematic (TN) liquid crystal layer, arrange with one first orientation and one second orientation respectively with the liquid crystal of rear side (near a side of backlight assembly) its front side (near observer's a side), one first and one second compensate film, it is front side and rear side at this TN liquid crystal layer respectively, and one first and one the 2nd PVA film, the position is at the front side of this first compensate film and the rear side of this second compensate film, and the absorption direction that has one first and one second polarized light respectively, wherein this first orientation and this second orientation angle are 70～120 degree, and this first polarized light absorption axle be-20～20 degree with this and this first orientation angle, and this second polarized light absorption axle and this second orientation angle are-20～20 degree, slow axis (direction of refractive index maximum) on this first compensate film plane is 70～110 degree with this first orientation angle, and the slow axis on this second compensate film plane is 70～110 degree with this second orientation angle respectively.
According to above-mentioned conception, wherein this first with the refractive index of all directions of this second compensate film be to satisfy n
x＞n
y＞n
zWherein x, y be meant be parallel to this first with this second compensate film plane on two vertical direction, z be expression perpendicular to this first with the direction on this second compensate film plane, wherein this first and this second compensate film plane on phase difference value be between 10 to 100nm.
According to above-mentioned conception, wherein this first and the z direction phase difference value of this second compensate film be between 80 to 300nm.
In description of contents of the present invention, wherein this first with this second compensate film plane on phase difference value R
0With vertical this first with the phase difference value R of this second compensate film direction
ThBe to be defined as respectively:
R
0＝(n
x-n
y)×d
Wherein, n
xWith n
yRepresent the refractive index on x, the y direction respectively, d represents this thicknesses of layers.
The present invention also proposes another kind of liquid crystal light valve, it comprises: a stable twisted nematic (TN) liquid crystal layer, arrange with one first orientation and one second orientation respectively with the liquid crystal of rear side (side of backlight assembly) its front side (observer's a side), one first Polarizer and one second Polarizer, the position is at the front side and the rear side of this TN liquid crystal layer respectively, and has one first and one second polarized light absorption axle respectively, wherein this first orientation and this second orientation angle are 70～120 degree, and this first polarized light absorption axle and this first orientation angle are-20～20 degree, and this second polarized light absorption axle and this second orientation angle are-20～20 degree.
According to above-mentioned conception, wherein this first also comprises one first and one second compensate film with the inboard of this second Polarizer (near a side of liquid crystal layer), and the refractive index of its all directions satisfies n
x＞n
y＞n
z, wherein x, y be meant be parallel to this first with this second compensate film plane on two vertical direction, z be expression perpendicular to this first with the direction on this second compensate film plane.
According to above-mentioned conception, wherein the slow axis (direction of refractive index maximum) on this first compensate film plane is 70～110 degree with this first orientation angle, and the slow axis on this second compensate film plane and this second orientation angle are 70～110 degree.
According to above-mentioned conception, wherein this first and the plane of this second compensate film on phase difference value be between the 100nm between 10nm.
According to above-mentioned conception, wherein this first and the z direction phase difference value of this second compensate film be between the 300nm between 80nm.
The present invention must and describe in detail by following accompanying drawing can obtain a more deep understanding:
Description of drawings
Fig. 1 is the liquid crystal light valve structural representation of the TN type LCD of tradition collocation optical compensation films;
Fig. 2 is the TN type liquid crystal light valve structural representation at the upper and lower visual angle of compensation of the present invention;
Fig. 3 is the film layer structure figure of the TN type liquid crystal light valve at the upper and lower visual angle of compensation of the present invention;
Fig. 4 is all directions display performance graph of a relation of the TN type LCD at the upper and lower visual angle of compensation of the present invention.
Embodiment
See also Fig. 2, it is in order to illustrate a specific embodiment of liquid crystal light valve structure principal character of the present invention.In the present embodiment, the structure of this liquid crystal light valve by observer 1 to comprising one the one PVA film 101, one first compensate film 102, a liquid crystal layer 300, one second compensate film 202, one the 2nd PVA film 201 back light 2 of bottom in regular turn.
Alignment direction compared to traditional TN liquid crystal layer, in the TN of present embodiment liquid crystal layer 300, the liquid crystal of its front side 301 (near observer's a side) is to arrange with one first orientation, and this first orientation is the upper left side (shown in the A direction of Fig. 2) of pointing to this liquid crystal layer 300; And the liquid crystal of its rear side 302 (near a side of backlight assembly) is to arrange with one second orientation, and this second orientation is the upper right side (shown in the B direction of Fig. 2) of pointing to this liquid crystal layer 300, and wherein this first orientation and this second orientation are to be angle 70～110 degree.
The one PVA film 101 is the polarized lights in order to the absorption specific direction, and this first orientation angle of the absorption axes of its polarized light and this liquid crystal layer is-20～20 degree (as the C direction of Fig. 2); And this second orientation angle of the absorption axes of the polarized light of the 2nd PVA film 201 of these liquid crystal layer 300 rear sides and this liquid crystal layer is-20～20 degree (as the D direction of Fig. 2).
This first compensate film 102 be the position between this liquid crystal layer 300 and a PVA layer 101, and the slow axis (direction of refractive index maximum) on these first compensate film, 102 planes and this first orientation angle are 70～110 to spend (as the E of Fig. 2); And this second compensate film 202 be the position between this liquid crystal layer 300 and the 2nd PVA layer 201, and the slow axis (direction of refractive index maximum) on these second compensate film, 202 planes and this second orientation angle are 70～110 to spend (as the F of Fig. 2).
The liquid crystal light valve of present embodiment is printing opacity angle and a light transmission capacity of controlling the liquid crystal light valve of each pixel (pixel) by the voltage that the control electrode 40 of position between this second compensate film 202 and this liquid crystal layer 300 applied, and be engaged in a color filter layers 50 that is had between this first compensate film 102 and this liquid crystal layer 300, make each pixel energy produce different colors.And principal character of the present invention be by above-mentioned LCD alignment (as A, the B direction of Fig. 2), this first with the 2nd PVA film 101 and 201 polarized light absorption direction of principal axis (as C, the D direction of Fig. 2) and this first and these second compensate film, 102,202 planes on slow axis (refractive index maximum) direction reach the optical compensation of this liquid crystal light valve under upper and lower visual angle change.
In the present embodiment, this first and all directions refractive index of this second compensate film 102,202 between relation be respectively n
x＞n
y＞n
zWherein x, y be meant be parallel to this first with these second compensate film, 102,202 planes on two vertical direction, z be expression perpendicular to this first with the direction on the plane of this second compensate film 102,202.Wherein, respectively this first with this second compensate film plane on phase difference value R
0Be between 10～100, and respectively this first with the z direction phase difference value R of this second compensate film
ThBe between 80～300.Wherein first with this second compensate film plane on phase difference value R
0Phase difference value R with the z direction
ThBe to be defined as respectively:
R
0=(n
x-n
y) * d with
Wherein, n
xWith n
yRepresent the refractive index on x, the y direction respectively, d represents this thicknesses of layers.
See also Fig. 3, it is another embodiment of liquid crystal light valve of the present invention.In the present embodiment, the structure of this liquid crystal light valve comprises one first Polarizer 10, a liquid crystal layer 300 and one second Polarizer 20 by observer's side in regular turn to the backlight assembly side.Wherein the liquid crystal of the front side 301 of this liquid crystal layer 300 has one first orientation, and the liquid crystal of the rear side 302 of this liquid crystal layer 300 has one second orientation.This first with the direction of this second orientation also as described above shown in the A on Fig. 2, the B direction mutually angle be 70～110 degree.And the polarized light absorption axle of this first Polarizer 10 and this first orientation angle are-20 ~ 20 degree; The polarized light absorption axle of this second Polarizer 20 and this second orientation angle are-20 ~ 20 degree.
This first with this second Polarizer 10,20 on, be to compensate rete 102,202, one first and 1 the 2nd PVA layers 102,201 and 100,200 compositions of one first and one second protective seam by one first and one second respectively on it.Wherein this first with this second protective seam be that Triafol T (TAC) material constitutes.And the slow-axis direction on these first compensate film, 102 planes is-20～20 degree with this first orientation angle respectively; And the slow-axis direction on these second compensate film, 202 planes is-20～20 degree with this first orientation angle also.This first and all directions refractive index of this second compensate film 102,202 between relation be respectively n
x＞n
y＞n
zWherein x, y be meant be parallel to this first with this second compensate film plane on two vertical direction, z be expression perpendicular to this first with the direction on this second compensate film plane.Wherein, respectively this first with this second compensate film plane on phase difference value R
0Be between 10～100, and respectively this first with the z direction phase difference value R of this second compensate film
ThBe between 80～300.
See also Fig. 4, it is the optical property graph of a relation that liquid crystal light valve of the present invention is watched by each visual angle, upper and lower, left and right.By on the figure as can be known, the optical compensation of liquid crystal light valve of the present invention mainly is to concentrate on the y direction (scope at upper and lower visual angle), and to the lifting aspect of X direction (scope at left and right visual angle), and is then not obvious.Therefore, the present invention can effectively improve gray-scale inversion on the upper and lower visual angle and the difference on the color, is fit to be applied to the notebook computer that the individual uses and the display of PC etc.
Above-described only in order to preferred embodiment of the present invention to be described, scope of the present invention ought not be subject to this preferred embodiment; And the present invention must also can be made the change or the replacement of all equivalences by those skilled in the art that, yet change that should equivalence or replace all should be included in the application's the claim institute restricted portion.
Claims (9)
1. liquid crystal light valve, it comprises:
One stable twisted nematic (TN) liquid crystal layer, the liquid crystal of its front side and rear side are arranged with one first orientation and one second orientation respectively;
One first and one second compensate film, it is front side and rear side at this TN liquid crystal layer respectively; And
One first and one the 2nd PVA film, the position and has the absorption direction of one first and one second polarized light respectively at the front side of this first compensate film and the rear side of this second compensate film;
Wherein this first orientation and this second orientation angle 70～110 are spent, and this first polarized light absorption axle and this first orientation angle-20～20, and this second polarized light absorption axle and this second orientation angle-20～20, the slow axis of the direction of refractive index maximum and this first orientation angle 70～110 on this first compensate film plane, and the slow axis on this second compensate film plane is to spend with this second orientation angle 70～110 respectively.
2. liquid crystal light valve as claimed in claim 1 is characterized in that this first satisfies n with the refractive index of all directions of this second compensate film
x＞n
y＞n
z, wherein x, y be meant be parallel to this first with this second compensate film plane on two vertical direction, z be expression perpendicular to this first with the direction on this second compensate film plane.
3. liquid crystal light valve as claimed in claim 2, it is characterized in that this first and this second compensate film plane on phase difference value be between the 100nm between 10nm.
4. liquid crystal light valve as claimed in claim 2, it is characterized in that this first and the z direction phase difference value of this second compensate film be between the 300nm between 80nm.
5. liquid crystal light valve, it comprises:
One stable twisted nematic (TN) liquid crystal layer, the liquid crystal of its front side and rear side are arranged with one first orientation and one second orientation respectively;
One first Polarizer and one second Polarizer, difference front side and rear side at this TN liquid crystal layer, and have one first and one second polarized light absorption axle respectively,
Wherein this first orientation and this second orientation angle 70～110 degree, and this first polarized light absorption axle and this first orientation angle-20～20 degree, and this second polarized light absorption axle and this second orientation angle-20～20 degree.
6. liquid crystal light valve as claimed in claim 5 is characterized in that this first also comprises one first and one second compensate film with the inboard of this second Polarizer, and the refractive index of its all directions is to satisfy n
x＞n
y＞n
z, wherein x, y be meant be parallel to this first with this second compensate film plane on two vertical direction, z be expression perpendicular to this first with the direction on this second compensate film plane.
7. liquid crystal light valve as claimed in claim 6 it is characterized in that the slow axis of the direction of refractive index maximum on this first compensate film plane and this first orientation angle 70～110 degree, and the slow axis on this second compensate film plane is spent with this second orientation angle 70～110.
8. liquid crystal light valve as claimed in claim 7, it is characterized in that this first and this second compensate film plane on phase difference value be between the 100nm between 10nm.
9. liquid crystal light valve as claimed in claim 7, it is characterized in that this first and the z direction phase difference value of this second compensate film be between the 300nm between 80nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510091915 CN1908773A (en) | 2005-08-04 | 2005-08-04 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510091915 CN1908773A (en) | 2005-08-04 | 2005-08-04 | Liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1908773A true CN1908773A (en) | 2007-02-07 |
Family
ID=37699922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510091915 Pending CN1908773A (en) | 2005-08-04 | 2005-08-04 | Liquid crystal display device |
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| Country | Link |
|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8665404B2 (en) | 2007-12-21 | 2014-03-04 | Nitto Denko Corporation | Liquid crystal cell substrate, liquid crystal cell, liquid crystal panel, and liquid crystal display |
-
2005
- 2005-08-04 CN CN 200510091915 patent/CN1908773A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8665404B2 (en) | 2007-12-21 | 2014-03-04 | Nitto Denko Corporation | Liquid crystal cell substrate, liquid crystal cell, liquid crystal panel, and liquid crystal display |
| CN105446011A (en) * | 2007-12-21 | 2016-03-30 | 日东电工株式会社 | Liquid crystal cell substrate, liquid crystal cell, liquid crystal panel, and liquid crystal display |
| CN105467684A (en) * | 2007-12-21 | 2016-04-06 | 日东电工株式会社 | Liquid crystal cell substrate, liquid crystal cell, liquid crystal panel, and liquid crystal display device |
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