CN1834750A - LCD device and interleaved polarizing film - Google Patents
LCD device and interleaved polarizing film Download PDFInfo
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- CN1834750A CN1834750A CN 200510053988 CN200510053988A CN1834750A CN 1834750 A CN1834750 A CN 1834750A CN 200510053988 CN200510053988 CN 200510053988 CN 200510053988 A CN200510053988 A CN 200510053988A CN 1834750 A CN1834750 A CN 1834750A
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- polarizing film
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Abstract
The invention provides a LCD and a staggered light polarizing film with wide visual angle. And the LCD with wide visual angle has multi-film compensation function. And the invention provides a LCD with a positive birefringent single-axis A-compensation film and a negative one to improve light leakage in dark state; as external voltage is not applied, liquid crystal layer is uniformly aligned between first and second substrates, and driven by horizontal electric field, materially; by compensation, it can largely reduce light leak and enlarge visual angle.
Description
Technical field
The present invention is relevant for the wide-angle liquid crystal display of the multiple film compensation of a kind of tool (multi-film compensation), particularly relevant for a kind of LCD of tool wide viewing angle, by the compensation of a positivity uniaxial birefringent film and a negativity uniaxial birefringent film, the light leakage phenomena when improving dark attitude are provided.
Background technology
LCD (LCD) is used in field of information display widely.Because the optical anisotropy (anisotropy) of liquid crystal material itself when different directions is watched, causes incident light to see different effective hyperbolic foldings (birefringence).Therefore, the visual angle of traditional LCD also is not so good as self-emitting display, and for example the visual angle of cathode ray tube (CRT), organic electro-luminescent display (OLED) and plasma display panel (PDP) is wide.For making LCD have wide viewing angle, several displays that use transverse electric field (lateralelectric field) to drive the liquid crystal molecule type are suggested, and for example transverse electric field drives (in-plane switching-IPS) type and fringe field drives (fringe field switching-FFS) type.The liquid crystal layer of the LCD of said two devices type, when voltage closed (voltage-off) state, orientation was between glass substrate or plastic base all in heterogeneity.The surface coated of aforesaid substrate approaches tin indium oxide (ITO) layer, on it again cloth with Polyimide (polyimide) alignment film.Grind to form the orientation of homogeneous through antiparallel (anti-parallel) direction on the surface of Polyimide film.Display pannel is folded between the two staggered light polarizing film, and the major axis of liquid crystal molecule is parallel or perpendicular to the penetrating shaft of its contiguous light polarizing film.Open under the state of (voltage-on) at voltage, liquid crystal molecule is by electric field driven that comb poles produced and reverse in the plane of parallel substrate.Therefore see it from the other direction of display pannel, the incident light experience is close to identical hyperbolic folding and can obtains a relative wide viewing angle thus and the image of symmetry.
Yet when seeing it from the tilted direction of axle (off-axis) certainly, the staggered light polarizing film of pairwise orthogonal (crossed polarizer) just no longer is perpendicular to one another, and especially sees it from halving line (bisector) direction of staggered light polarizing film.The absorption axes 10,20 that Figure 1A and Figure 1B show upper and lower staggered light polarizing film is from forward (as Figure 1A) or the synoptic diagram watched from halving line inclination polar angle (polar angle) θ direction (as Figure 1B).Shown in Figure 1B, formed angle is 2tan between this two staggered light polarizing film
-1(cos θ), end relies the polar angle θ that is watched and decides.Apparently, along with the polar angle θ that watches increases, the angle between the two staggered light polarizing film can more depart from 90 °.Thereby, causing along with polar angle θ increases, light leak also increases thereupon.For example, the visual angle figure of shown typical two staggered light polarizing film among Fig. 2.Watch by 45 °, 135 °, 225 ° and 315 ° of isoazimuths (azimuthal angle), when polar angle θ increases to 70 °, light leak promptly become obviously (light leak ratio increases to 0.015 from 0.0001).Traditional transverse electric field is driven (IPS) type LCD, and wide viewing angle promptly is shown among Fig. 3 A to Fig. 3 C.Under the state that voltage closes, to watch by 45 °, 135 °, 225 ° and 315 ° of isoazimuths, the outline line that contrasts 10: 1 is defined to 70 ° polar angle θ.
In order to solve the light leak problem of staggered light polarizing film, prior art has proposed multiple compensation way.For example, in SID ' 98Digest, people such as the middle Chen of pp.315-318 " Optimum Film Compensation Modes forTN and VA LCDs " propose by positivity hyperbolic folding C-compensate film (n
x=n
y＜n
z, the z-axle is the thickness direction along film) and add positivity hyperbolic folding A-compensate film (n
x＞n
y=n
z).In Jpn.J.Appl.Phys.Part 1, Vol.37, people such as the middle Saitoh of pp.4822-4828 (1998) " Optimum FilmCompensation Modes of Viewing Angle of Contrast inIn-Plane-Switching-Mode Liquid Crystal Display " use single biaxial film (n
x＞n
y＞n
z) to compensate the light leak of staggered light polarizing film.And in I DW ' 01, people such as the middle Ishinabe of pp.485-488 (2001) " A Wide Viewing Angle Polarizer and a Quarter-WavePlate with a Wide Wavelength Range for Extremely High Quality LCDs " use two biaxial film to compensate in the light leak of long wavelength's scope.Yet the cost of C-compensate film and biaxial compensation film is usually far above the cost of A-compensate film.In addition, can't reach the visual angle of symmetry usually in conjunction with C-compensate film and A-compensate film or biaxial film.
In view of this, the present invention utilizes the light leak problem of the staggered light polarizing film of Peng Karui (Poincar é) ball polarized state (spherepolarization state) representation analysis.Based on the result who analyzes, the present invention proposes to compensate LCD and has liquid crystal layer orientation in heterogeneity when voltage closes (voltage-off) state, and driven by transverse electric field when voltage is opened (voltage-on) state, for example transverse electric field drives (IPS) type and fringe field drives (FFS) type LCD.
Summary of the invention
In view of this, the object of the present invention is to provide one to have the LCD of wide viewing angle, be applicable to the HDTV (HDTV) or the monitor of screen sizes.
Another object of the present invention is to provide a compensation method to reach the light polarizing film that therefore obtains the tool wide viewing angle with the light leak that reduces staggered light polarizing film.
For reaching above-mentioned purpose, the invention provides a kind of LCD, comprise one first substrate, have one first alignment film; One second substrate has one second alignment film; One liquid crystal layer is folded between first substrate and second substrate; One first light polarizing film is laminated in the outside of first substrate, in tossing about of liquid crystal layer; One second light polarizing film is laminated in the outside of second substrate, in tossing about of liquid crystal layer, and positivity hyperbolic folding uniaxial film (A-compensate film, n
x＞n
y=n
z) and negativity hyperbolic folding uniaxial film (A-compensate film, n
x＜n
y=n
z) be arranged between second substrate and second light polarizing film or between first substrate and first light polarizing film.Wherein, when no impressed voltage, orientation is between first substrate and second substrate in fact in heterogeneity for liquid crystal layer, and wherein, liquid crystal layer is driven by the transverse electric place that comb-type electrode or interdigital shape electrode are produced in fact.
For reaching above-mentioned purpose, the invention provides a kind of staggered light polarizing film of wide viewing angle, comprise one first light polarizing film, one second light polarizing film, and positivity hyperbolic folding uniaxial film (A-compensate film, n
x＞n
y=n
z) and negativity hyperbolic folding uniaxial film (A-compensate film, n
x＜n
y=n
z) be arranged between first light polarizing film and second light polarizing film.
Description of drawings
Figure 1A-Figure 1B shows that respectively staggered light polarizing film reaches the synoptic diagram of watching from halving line inclination polar angle θ direction from normal direction;
Fig. 2 is the visual angle figure of typical two staggered light polarizing film, wherein 0.0001,0.0005 ..., the light leak ratio during the dark attitude of 0.015 representative;
Fig. 3 A-Fig. 3 C shows dark attitude light leak ratio, bright attitude brightness ratio and the brightness contrast and the visual angle graph of a relation of existing electric field driven (IPS) type LCD respectively;
Fig. 4 A shows that the present invention watches the staggered light polarizing film of orthogonality from normal direction, and absorption axes each other is vertical mutually;
Fig. 4 B shows Peng Karui (Poincar é) ball polarized state representation, and the penetrating shaft POL (T) of following light polarizing film and the absorption axes ANA (A) of last light polarizing film are overlapping fully;
Fig. 5 A shows that the present invention watches the orthogonality ground light polarizing film of interlocking from the halving line vergence direction;
Fig. 5 B shows Peng Karui (Poincar é) ball polarized state representation, and the penetrating shaft of following light polarizing film and the absorption axes of last light polarizing film depart from each other;
Fig. 6 A shows that the present invention watches the staggered light polarizing film that is made of positivity A-compensate film and negativity A-compensate film from the pitch angle;
Fig. 6 B shows Peng Karui (Poincar é) ball polarized state representation, and incident light can fully be absorbed by last light polarizing film and not have light leak and take place;
What Fig. 7 showed the staggered light polarizing film that is made of positivity A-compensate film and negativity A-compensate film watches visual angle figure, and wherein 0.0001,0.0002 ... represent light leak ratio;
Fig. 8 A demonstration another embodiment of the present invention is watched the staggered light polarizing film that is made of positivity A-compensate film and negativity A-compensate film from the pitch angle, wherein positivity A-compensate film and negativity A-compensate film location swap;
Fig. 8 B shows Peng Karui (Poincar é) the ball polarized state representation of another embodiment of the present invention, wherein positivity A-compensate film and negativity A-compensate film location swap;
What Fig. 9 showed staggered light polarizing film that another embodiment of the present invention is made of positivity A-compensate film and negativity A-compensate film watches visual angle figure, and wherein 0.0001,0.0002 ... represent light leak ratio, its positivity A-compensate film and negativity A-compensate film location swap;
Figure 10 shows that the transverse electric field according to the multiple film compensation of first embodiment of the invention tool drives the structural representation of (IPS) type LCD;
Figure 11 shows that the transverse electric field according to the multiple film compensation of first embodiment of the invention tool drives Peng Karui (Poincar é) the ball polarized state representation of (IPS) type LCD;
Figure 12 A-Figure 12 C shows that the transverse electric field according to the multiple film compensation of first embodiment of the invention tool drives dark attitude light leak ratio, bright attitude brightness ratio and the brightness contrast and the visual angle graph of a relation of (IPS) type LCD;
Figure 13 shows that the transverse electric field according to the multiple film compensation of second embodiment of the invention tool drives the structural representation of (IPS) type LCD;
Figure 14 shows that the transverse electric field according to the multiple film compensation of second embodiment of the invention tool drives Peng Karui (Poincar é) the ball polarized state representation of (IPS) type LCD;
Figure 15 A-Figure 15 C shows that the transverse electric field according to the multiple film compensation of second embodiment of the invention tool drives dark attitude light leak ratio, bright attitude brightness ratio and the brightness contrast and the visual angle graph of a relation of (IPS) type LCD;
Figure 16 shows that the transverse electric field according to the multiple film compensation of third embodiment of the invention tool drives the structural representation of (IPS) type LCD;
Figure 17 shows that the transverse electric field according to the multiple film compensation of third embodiment of the invention tool drives Peng Karui (Poincar é) the ball polarized state representation of (IPS) type LCD;
Figure 18 A-Figure 18 C shows that the transverse electric field according to the multiple film compensation of third embodiment of the invention tool drives dark attitude light leak ratio, bright attitude brightness ratio and the brightness contrast and the visual angle graph of a relation of (IPS) type LCD;
Figure 19 shows that the transverse electric field according to the multiple film compensation of fourth embodiment of the invention tool drives the structural representation of (IPS) type LCD;
Figure 20 shows that the transverse electric field according to the multiple film compensation of fourth embodiment of the invention tool drives Peng Karui (Poincar é) the ball polarized state representation of (IPS) type LCD;
Figure 21 A-Figure 21 C shows that the transverse electric field according to the multiple film compensation of fourth embodiment of the invention tool drives dark attitude light leak ratio, bright attitude brightness ratio and the brightness contrast and the visual angle graph of a relation of (IPS) type LCD;
Figure 22 shows that the transverse electric field of existing tool positivity C-compensate film and the compensation of negativity A-compensate film drives the structural representation of (IPS) type LCD;
Figure 23 shows that the transverse electric field of existing tool positivity C-compensate film and the compensation of negativity A-compensate film drives Peng Karui (Poincar é) the ball polarized state representation of (IPS) type LCD; And
Figure 24 A-Figure 24 C shows that the transverse electric field of existing tool positivity C-compensate film and the compensation of negativity A-compensate film drives dark attitude light leak ratio, bright attitude brightness ratio and the brightness contrast and the visual angle graph of a relation of (IPS) type LCD.
Symbol description
10,10 ', the penetrating shaft of 20 light polarizing film
100a, 100b, 100c, 100d, 200 LCD
110,210 first light polarizing film, 120,220 liquid crystal cells
122,222 first substrates, 124,224 second substrates
125,225 liquid crystal layers, 150,250 second light polarizing film
130 positivity hyperbolics folding single shaft A-compensate film
140,230 negativity hyperbolics folding single shaft A-compensate film
260 positivity C-compensate films
Embodiment
When normal direction was watched, the staggered light polarizing film of orthogonality can produce splendid dark attitude.Thereby many panel of LCD use staggered light polarizing film to produce good dark attitude.The production method that tradition is used for the LCD light polarizing film is with the pull polymeric membrane, the polyvinyl alcohol (PVA) (PVA) of for example mix iodine or organic dyestuff.The optical property of light polarizing film is equivalent to a single shaft absorbing film, and the flat shape of its absorption axes is in the optical axis (optical axis) of light polarizing film.Watch the staggered light polarizing film of orthogonality from normal direction, absorption axes each other mutually the absorption axes POL (A) of vertical-following light polarizing film perpendicular to the absorption axes ANA (A) of last light polarizing film, shown in Fig. 4 A.In Peng Karui (Poincar é) ball polarized state representation, the penetrating shaft POL (T) of following light polarizing film and the absorption axes ANA (A) of last light polarizing film are overlapping fully, shown in Fig. 4 B.Therefore, no light leak takes place and can obtain good dark attitude.Yet from seeing it from the tilted direction of axle, the staggered light polarizing film of pairwise orthogonal just no longer is perpendicular to one another, and especially sees it from the halving line direction of staggered light polarizing film.Fig. 5 A shows the synoptic diagram of watching staggered light polarizing film from the halving line vergence direction.In Peng Karui (Poincar é) ball, can be clear that down that the penetrating shaft POL (T) of light polarizing film and the absorption axes ANA (A) of last light polarizing film depart from each other, shown in Fig. 5 B.Therefore, cause the light leak of staggered light polarizing film as shown in Figure 2.
For LCD, has liquid crystal layer orientation in heterogeneity when voltage-off state, and driven by transverse electric field when voltage is opened state, for example transverse electric field drives (IPS) type and fringe field drives (FFS) type LCD, and the light leak of dark attitude is mainly led because of in the light leak of the light polarizing film of interlocking.Therefore, the problem of the light leak of the staggered light polarizing film of solution can increase the visual angle that transverse electric field drives (IPS) type and fringe field driving (FFS) type LCD significantly.The staggered light polarizing film that is made of a positivity A-compensate film and a negativity A-compensate film is watched in Fig. 6 A demonstration from the pitch angle.Positivity A-compensate film is that its optical axis of single shaft hyperbolic folded film is parallel to this film surface and hyperbolic folding Δ n=n
e-n
o＞0 (n
x＞n
y=n
z, n
y＞n
x=n
zOr n
z＞n
x=n
y, n
e=n
x, n
yOr n
z, n
o=n
y, n
zOr n
x), and negativity A-compensate film to be its optical axis of single shaft hyperbolic folded film be parallel to this film surface and hyperbolic folding Δ n=n
e-n
o＜0.Below be described in detail at the principle of compensate film.See also Fig. 6 B, when incident light passed through to descend light polarizing film, it converted linear polarisation to and is located in a some POL (T).After passing through positivity A-compensate film, its polarized state goes to the B point with clockwise direction.Then, after passing through negativity A-compensate film, its polarized state goes to ANA (A) point with clockwise direction.Therefore, incident light can fully be absorbed by last light polarizing film and not have light leak and take place.For keeping normal direction and watching the result constant from axial direction, the optical axis of positivity A-compensate film and negativity A-compensate film should be parallel to light polarizing film or the upward absorption axes of light polarizing film down.What Fig. 7 showed the staggered light polarizing film that is made of positivity A-compensate film and negativity A-compensate film watches visual angle figure.Compared to uncompensated result, as shown in Figure 2, maximum light leak reduces by 30 times.Another embodiment according to the present invention, the position of positivity A-compensate film and negativity A-compensate film is interchangeable.It shows arranges synoptic diagram and Peng Karui (Poincar é) ball polarized state representation shown in Fig. 8 A and Fig. 8 B, and the result of compensation as shown in Figure 9.
Above-mentioned compensation principle is extended to LCD, have the liquid crystal layer of homogeneous orientation initially, the position of the orientation of liquid crystal layer, compensate film and light polarizing film is to all should suitably setting.The more important thing is that the phase retardation of compensate film (phase retardation) need make its optimization.The required parameter list of Computer Simulation is listed in table 1.
Table 1
| Analog parameter | Numerical value |
| n e | 1.5621(λ＝550nm) |
| n o | 1.4771(λ＝550nm) |
| ε p | 14.7 |
| ε v | 4.4 |
| K 11 | 9.2×10 -12N |
| K 22 | 6.1×10 -12N |
| K 33 | 14.6×10 -12N |
| Cel-gap | 4.0 |
| Tilt angle | |
| 1° |
Embodiment one
Figure 10 shows that the transverse electric field of the multiple film compensation of tool drives the structural representation of (IPS) type LCD 100a.Driving (FFS) type LCD for fringe field also can similarly be suitable for.One first substrate 122, for example glass or plastic base have first alignment film (grinding 0 ° of angle), as the infrabasal plate 122 of display.One second substrate 124 has one second alignment film (grinding 0 ° of angle), as the upper substrate of display.One liquid crystal layer 125 is folded between first substrate 122 and second substrate 124.First substrate 122, liquid crystal layer 125 and second substrate 124 constitute a liquid crystal cell 120.One first light polarizing film 110 (90 ° of penetrating shaft angles) is laminated in the outside of first substrate 122, in tossing about of liquid crystal layer 125.One second light polarizing film 150 (0 ° of penetrating shaft angle) is laminated in the outside of second substrate 124, in tossing about of liquid crystal layer 125.And one positivity hyperbolic folding single shaft A-compensate film 130 (90 ° of optical axis angles) and negativity hyperbolic folding single shaft A-compensate film 140 (0 ° of optical axis angle) be arranged between second substrate 124 and second light polarizing film 150.Positivity hyperbolic folding single shaft A-compensate film 130 is arranged between second substrate 124 and second light polarizing film 150 and negativity hyperbolic folding single shaft A-compensate film 140 is arranged between the positivity hyperbolic folding single shaft A-compensate film 130 and second light polarizing film 150.When no impressed voltage, liquid crystal layer in fact in heterogeneity orientation between first substrate 122 and second substrate 124 and the transverse electric place that produced by comb-type electrode or interdigital shape electrode in fact of liquid crystal layer drive.
According to better embodiment of the present invention, the angle between the penetrating shaft of the penetrating shaft of first light polarizing film 110 and second light polarizing film 150 is greater than 85 ° and less than 95 °, and the preferably is greater than 88 ° and less than 92 °.Angle between the penetrating shaft of first light polarizing film 110 and the orientation of liquid crystal layer is greater than 85 ° and less than 95 °, and the preferably is greater than 88 ° and less than 92 °.The phase retardation scope of positivity hyperbolic folding single shaft A-compensate film 130 is between 0.1≤d Δ n/ λ≤0.25, and the preferably is 0.14≤d Δ n/ λ≤0.19, and wherein λ is the incident light wavelength, and d is the thickness of this film, Δ n=n
e-n
oHyperbolic folding for this film.
The optical axis and the plane parallel of this film of negativity hyperbolic folding single shaft A-compensate film 140, and the negativity hyperbolic rolls over angle between the penetrating shaft of the optical axis of single shaft A-compensate film and second light polarizing film greater than-5 ° and less than+5 °, the preferably is greater than-2 ° and less than+2 °.The phase retardation scope of negativity hyperbolic folding uniaxial film is between-0.25≤d Δ n/ λ≤-0.1, and the preferably is-0.19≤d Δ n/ λ≤-0.14, and wherein λ is the incident light wavelength, and d is the thickness of this film, Δ n=n
e-n
oHyperbolic folding for this film.
The compensation principle of transverse electric field driving (IPS) type LCD 100a as shown in figure 11.When incident light passed through to descend light polarizing film, it converted linear polarisation to.Because the orientation of liquid crystal layer is the edge absorption axes direction of Polarizer down, therefore above-mentioned linear polarisation can't change its polarized state after by liquid crystal layer.Therefore, present embodiment can be used the rule of pure light polarizing film of interlocking, and after smoothly by positivity A-compensate film and negativity A-compensate film, its polarized state goes to ANA (A) point with clockwise direction, that is goes up the absorption axes of Polarizer.Optimized positivity A-compensate film and negativity A-compensate film parameter list are listed in table 2.Figure 12 A-Figure 12 C shows that the transverse electric field of tool positivity A-compensate film and negativity A-compensate film drives the analog result of (IPS) type LCD.In ± 80 ° field-of-view cone, contrast ratio can reach greater than 200: 1.
Table 2
| The form of film | Thickness (μ m) | The hyperbolic folding Δ n=n of film e-n o | The phase retardation d Δ n of film |
| Positivity A-compensate film | 59.0 | 0.0015 | 88.5 |
| Negativity A-compensate film | 59.5 | -0.0015 | -89.3 |
Embodiment two
Embodiment two mainly is that the design according to embodiment one is provided with, and difference is in the LCD 100b of second embodiment, the location swap of its positivity A-compensate film 130 (0 ° of optical axis angle) and negativity A-compensate film 140 (90 ° of optical axis angles).Its structural representation as shown in figure 13, and its compensation principle is shown in Peng Karui among Figure 14 (Poincar é) ball.Optimized positivity A-compensate film and negativity A-compensate film parameter list are listed in table 3.Figure 15 A-Figure 15 C shows that the transverse electric field of tool positivity A-compensate film and negativity A-compensate film drives the analog result of (IPS) type LCD.Get in the field-of-view cone at ± 80 °, contrast ratio can reach greater than 200: 1.
Table 3
| The form of film | Thickness (μ m) | The hyperbolic folding Δ n=n of film e-n o | The phase retardation d Δ n of film |
| Positivity A-compensate film | 56.5 | 0.0015 | 84.8 |
| Negativity A-compensate film | 61.5 | -0.0015 | -92.3 |
Embodiment three
Compensate film also can be arranged between infrabasal plate and the following light polarizing film.Figure 16 shows that the present embodiment transverse electric field drives the structural representation of (IPS) type LCD 100c.First light polarizing film 110 (0 ° of penetrating shaft angle) is laminated in the outside of first substrate 122, in tossing about of liquid crystal layer 125.Second light polarizing film 150 (90 ° of penetrating shaft angles) is laminated in the outside of second substrate 124, in tossing about of liquid crystal layer 125.One positivity hyperbolic folding single shaft A-compensate film 130 (0 ° of optical axis angle) and negativity hyperbolic folding single shaft A-compensate film 140 (90 ° of optical axis angles) are arranged between first substrate 122 and first light polarizing film 110.Positivity hyperbolic folding single shaft A-compensate film 130 is arranged between first substrate 122 and first light polarizing film 110 and negativity hyperbolic folding single shaft A-compensate film 140 is arranged between the positivity hyperbolic folding single shaft A-compensate film 130 and first substrate 122.The reason that compensate film can be arranged between infrabasal plate and the following light polarizing film is that when light passed through compensate film, it converted linear polarisation to, along the absorption axes of last light polarizing film.As long as liquid crystal layer does not change its polarized state, just can avoid in the light leak of voltage-off state.The principle of its compensation is shown in Peng Karui among Figure 17 (Poincar é) ball.Optimized positivity A-compensate film and negativity A-compensate film parameter list are listed in table 4.Figure 18 A-Figure 18 C shows that the transverse electric field of tool positivity A-compensate film and negativity A-compensate film drives the analog result of (IPS) type LCD.In present embodiment, contrast ratio is slightly smaller than embodiment one and embodiment two.Yet, getting in the field-of-view cone at ± 80 °, contrast ratio still can reach greater than 100: 1.
Table 4
| The form of film | Thickness (μ m) | The hyperbolic folding An=n of film e-n o | The phase retardation d Δ n of film |
| Positivity A-compensate film | 62.5 | 0.0015 | 93.8 |
| Negativity A-compensate film | 58.5 | -0.0015 | -87.8 |
Embodiment four
Embodiment four mainly is that the design according to embodiment three is provided with, and difference is in the LCD 100d of the 4th embodiment, the location swap of its positivity A-compensate film 130 (90 ° of optical axis angles) and negativity A-compensate film 140 (0 ° of optical axis angle).Its structural representation as shown in figure 19, and its compensation principle is shown in Peng Karui among Figure 20 (Poincar é) ball.Optimized positivity A-compensate film and negativity A-compensate film parameter list are listed in table 5.Figure 21 A-Figure 21 C shows that the transverse electric field of tool positivity A-compensate film and negativity A-compensate film drives the analog result of (I PS) type LCD 100d.Same, in ± 80 ° field-of-view cone, contrast ratio still can reach greater than 100: 1.
Table 5
| The form of film | Thickness (μ m) | The hyperbolic folding Δ n=n of film e-n o | The phase retardation d Δ n of film |
| Positivity A-compensate film | 56.0 | 0.0015 | 84.0 |
| Negativity A-compensate film | 63.0 | -0.0015 | -94.5 |
With feature result of the present invention compared with the prior art, the result is described below.Figure 22 shows that the tool positivity C-compensate film 260 of prior art and the transverse electric field that negativity A-compensate film 230 (0 ° of optical axis angle) compensates drive the structural representation of (IPS) type LCD 200.First light polarizing film 210 (90 ° of penetrating shaft angles) is laminated in the outside of first substrate 222, in tossing about of liquid crystal layer 225.Second light polarizing film 250 (0 ° of penetrating shaft angle) is laminated in the outside of second substrate 224, in tossing about of liquid crystal layer 225.One negativity hyperbolic folding single shaft A-compensate film 230 (0 ° of an optical axis angle) and a positivity C-compensate film 260 are arranged between first substrate 222 and first light polarizing film 210.Figure 20 shows that its compensation principle represents with Peng Karui (Poincar é) ball.Optimized positivity A-compensate film and positivity C-compensate film 260 parameter lists are listed in table 6.Its dark attitude visual angle figure, bright attitude penetrate visual angle figure and contrast visual angle figure is shown in respectively among Figure 24 A-Figure 24 C.In Figure 24 A, on the whole maximum light leak is 33% to be higher than the present invention shown in Figure 12 A.Comparison diagram 24A and Figure 12 A once more, the present invention is corresponding to the visual angle of contrast ratio greater than 200: 1, and is big 10 ° than the visual angle of prior art.The more important thing is that the cost of negativity A-compensate film is far below the cost of C-compensate film.The invention provides the preferable compensate film of low cost and performance can make the visual angle of transverse electric field driving (IPS) type and fringe field driving (FFS) type LCD broaden.
Table 6
| The form of film | Thickness (μ m) | The hyperbolic folding Δ n=n of film e-n o | The phase retardation d Δ n of film |
| Positivity A-compensate film | 87.0 | 0.0015 | 130.5 |
| Positivity C-compensate film | 56.5 | 0.0015 | 84.8 |
Feature of the present invention and effect are to utilize multiple film compensation method to reduce the light leak of staggered light polarizing film, thereby obtain the light polarizing film of wide viewing angle.By providing low cost and performance preferable compensate film, the visual angle that makes transverse electric field drive (IPS) type and fringe field driving (FFS) type LCD broadens.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing to change and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (10)
1. a LCD is characterized in that, comprising:
One first substrate has one first alignment film;
One second substrate has one second alignment film;
One liquid crystal layer is folded between this first substrate and this second substrate;
One first light polarizing film is laminated in the outside of this first substrate, in tossing about of this liquid crystal layer;
One second light polarizing film is laminated in the outside of this second substrate, in tossing about of this liquid crystal layer; And
One positivity hyperbolic folding uniaxial film and negativity hyperbolic folding uniaxial film are arranged between this second substrate and this second light polarizing film or between this first substrate and this first light polarizing film;
Wherein, this liquid crystal layer is driven by the transverse electric place that comb-type electrode or interdigital shape electrode are produced in fact.
2. LCD as claimed in claim 1 is characterized in that, this positivity hyperbolic folding uniaxial film is arranged between this second substrate and this second light polarizing film and this negativity hyperbolic folding uniaxial film is arranged between this positivity hyperbolic folding uniaxial film and this second light polarizing film.
3. LCD as claimed in claim 1 is characterized in that, this negativity hyperbolic folding uniaxial film is arranged between this second substrate and this second light polarizing film and this positivity hyperbolic folding uniaxial film is arranged between this negativity hyperbolic folding uniaxial film and this second light polarizing film.
4. LCD as claimed in claim 1 is characterized in that, this negativity hyperbolic folding uniaxial film is arranged between this first substrate and this first light polarizing film and this positivity hyperbolic folding uniaxial film is arranged between this negativity hyperbolic folding uniaxial film and this first light polarizing film.
5. LCD as claimed in claim 1 is characterized in that, this positivity hyperbolic folding uniaxial film is arranged between this first substrate and this first light polarizing film and this negativity hyperbolic folding uniaxial film is arranged between this positivity hyperbolic folding uniaxial film and this first light polarizing film.
6. the staggered light polarizing film of a tool wide viewing angle is characterized in that, comprising:
One first light polarizing film;
One second light polarizing film; And
One positivity hyperbolic folding uniaxial film and negativity hyperbolic folding uniaxial film are arranged between this first light polarizing film and this second light polarizing film.
7. the staggered light polarizing film of tool wide viewing angle as claimed in claim 6, it is characterized in that this positivity hyperbolic folding uniaxial film is arranged between this first light polarizing film and this second light polarizing film and this negativity hyperbolic folding uniaxial film is arranged between this positivity hyperbolic folding uniaxial film and this second light polarizing film.
8. the staggered light polarizing film of tool wide viewing angle as claimed in claim 6, it is characterized in that this positivity hyperbolic folding uniaxial film is arranged between this first light polarizing film and this second light polarizing film and this negativity hyperbolic folding uniaxial film is arranged between this positivity hyperbolic folding uniaxial film and this first light polarizing film.
9. the staggered light polarizing film of tool wide viewing angle as claimed in claim 6, it is characterized in that, the optical axis of this positivity hyperbolic folding uniaxial film and the plane parallel of this film, and the angle between the penetrating shaft of the optical axis of this positivity hyperbolic folding uniaxial film and this second light polarizing film is greater than 85 ° and less than 95 °.
10. the staggered light polarizing film of tool wide viewing angle as claimed in claim 6, it is characterized in that the phase retardation scope of this positivity hyperbolic folding uniaxial film and this negativity hyperbolic folding uniaxial film is between 0.1≤d Δ n/ λ≤0.25, wherein λ is the incident light wavelength, d is the thickness of this film, Δ n=n
e-n
oHyperbolic folding for this film.
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| CNB2005100539889A CN100454102C (en) | 2005-03-15 | 2005-03-15 | LCD device and interleaved polarizing film |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100539889A CN100454102C (en) | 2005-03-15 | 2005-03-15 | LCD device and interleaved polarizing film |
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| CN100454102C CN100454102C (en) | 2009-01-21 |
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| CNB2005100539889A Expired - Fee Related CN100454102C (en) | 2005-03-15 | 2005-03-15 | LCD device and interleaved polarizing film |
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| CN101609178B (en) * | 2009-07-09 | 2011-01-05 | 友达光电股份有限公司 | Polarizer, liquid crystal display module and stereoscopic liquid crystal display |
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| JP3946303B2 (en) * | 1997-05-08 | 2007-07-18 | シャープ株式会社 | LCD panel |
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