CN1595247A - Polarizers for Multi-domain Vertical Alignment Liquid Crystal Displays - Google Patents
Polarizers for Multi-domain Vertical Alignment Liquid Crystal Displays Download PDFInfo
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Abstract
A polarizing plate for a liquid crystal display is composed of two parts. The first part of the polarizing plate is adjacent to the backlight source, and the backlight source and the multi-domain vertical alignment liquid crystal layer sequentially comprise a protective film, a linear polarizing film, a biaxial extension film and a quarter-wavelength phase difference film. The second part of the polarizer is positioned at the other side of the multi-domain vertical alignment liquid crystal layer, and comprises a quarter-wavelength phase difference film, a biaxial extension film, a linear polarization film and a protective film in sequence from the multi-domain vertical alignment liquid crystal layer.
Description
(1) technical field
The device of the relevant a kind of LCD of the present invention, and the Polarizer of relevant a kind of multi-domain vertical alignment liquid crystal displays particularly.
(2) background technology
Advantages such as LCD has that high image quality, volume are little, in light weight, low voltage drive, low consumpting power and applied range.Therefore be widely used in medium and small Portable TV, mobile phone, shoot with video-corder consumer electronics or computer products such as projector, notebook computer, console display and projection TV, and (cathode ray tube CRT) becomes the main flow of display to replace cathode-ray tube (CRT) gradually.In recent years, heighten in LCD market, especially in the application of computer and notebook computer.And so-called large tracts of land, high-res, wide viewing angle and the requirement in reaction time etc. fast also become the key point that these LCD require.
Multi-zone vertical alignment nematic (multi-domain vertical alignment, MVA) be the wide viewing angle technology that a kind of quilt extensively uses, constituted by vertical orientation technology, vertical orientation type liquid crystal (using specific inductive capacity anisotropy to be negative liquid crystal material) and orientation cutting techniques.In the LCD of this type of multi-zone vertical alignment nematic, need at inner some structures of making of two plate bases of LCD, utilize these structures to form zones of different, and each regional liquid crystal molecule is arranged towards different directions, to realize the function of wide viewing angle.
Figure 1A is the synoptic diagram of the liquid crystal panel of known multi-zone vertical alignment nematic.Below explain for example with being responsible for the red liquid crystal pixel 102 of demonstration among Figure 1A, liquid crystal pixel 102 is divided into four zones by several TFT substrate-side structures 112 and several colored filter substrate side structures 114, has the liquid crystal molecule of arranging towards different directions 122,124,126 and 128 in each zone respectively.Figure 1B is the synoptic diagram of the Liquid Crystal Molecules Alignment direction of zones of different among Figure 1A.Shown in Figure 1B, in these four zones, liquid crystal molecule 122,124,126 and 128 is arranged towards different directions respectively, to reach the function of wide viewing angle.
In general, the multi-zone vertical alignment nematic technology can provide at least four orientation zones in single pixel, makes it can reach the wide-angle of four direction at least.For the viewing angle characteristic that four orientations zone orientation is cut apart, its oblique miter angle directivity characteristics is relatively poor, but as long as collocation simultaneously uses optical compensation films to do compensation, for example double shaft extensioning film (biaxial film) can obtain preferable viewing angle characteristic.
Yet except oblique 45 degree viewing angle characteristics, also there is the problem of luminance shortage in the multi-zone vertical alignment nematic technology.At first, because the multi-zone vertical alignment nematic technology is to form a plurality of structures to come partition to do the action of orientation to the zone and to liquid crystal molecule on panel, and these structures can reduce the aperture opening ratio of panel inevitably.The aperture opening ratio of panel is relevant with the brightness of LCD, and when the panel aperture opening ratio was big more, the brightness of LCD was just big more.Therefore, these are employed structure in the multi-zone vertical alignment nematic technology, tends to reduce the brightness of LCD, causes the problem of luminance shortage.
In addition, the liquid crystal molecule of vertical orientation is a vertical orientation when (off state) in off position, and its arrangement mode is perpendicular to liquid crystal panel, to present dark state.When opening (on state), then can be subjected to electric field influence and topple over changing horizontal direction matching into, its arrangement mode is parallel to upper and lower base plate, but not parallel with arbitrary absorption axes of last or lower linear polarizing film, to present bright state.Under this kind configuration, when two adjacent liquid crystal molecules are toppled over because of electric field influence, often bump together because both positions are too close.And, being subjected under the electric field effects continuing, this two liquid crystal molecule have to continue to tilt toward the direction parallel with absorption axes last or the lower linear polarizing film, and the arrangement mode of this two liquid crystal molecule can be parallel to or the absorption axes of lower linear polarizing film on the contrary at last.
Therefore, in this kind liquid crystal pixel, the liquid crystal molecule of each orientation zone intersection, when opening, but can be parallel to above-mentioned absorption axes because of its orientation, and make this operate in the liquid crystal pixel of bright state, position but presents the dark line pattern of a similar cross in the middle of it.The dark line of this cross can reduce the briliancy of LCD when bright state, and because the definition of contrast is generally the ratio of bright state briliancy and dark state briliancy, therefore the above-mentioned dark line of cross also can reduce the contrast of LCD, causes the brightness of LCD and the problem of contrast deficiency.
Known multi-domain vertical alignment liquid crystal displays has the problem of above-mentioned brightness and contrast deficiency, and therefore the high brightness and high contrast in order to keep LCD when manufacturing and designing LCD, can use more a plurality of fluorescent tubes usually in its backlight.Yet if the number of the backlight lighting tube that uses in the LCD is many more, the required electric power of its operation also improves relatively, and the heat that thereupon produces is also high more.High power consumption requirements can make the portable electronic device that is extensive use of LCD, and as notebook computer or personal digital assistant etc., its working time reduces, and more is unfavorable for carrying using operation.And unnecessary heat tends to increase the heat radiation burden of LCD, and quickens its backlight lighting tube of loss, reduces the serviceable life of backlight lighting tube.
(3) summary of the invention
Therefore the Polarizer that the purpose of this invention is to provide a kind of multi-domain vertical alignment liquid crystal displays in order to improve the brightness of multi-domain vertical alignment liquid crystal displays, improves the problem of the high power consumption and the high heating of known multi-zone vertical alignment nematic display.
Another object of the present invention provides a kind of Polarizer of multi-domain vertical alignment liquid crystal displays, utilize the quarter-wave phasic difference film that is added to improve the utilization factor of light, increase the brightness of LCD when bright attitude, reduce the loss problem of its backlight lighting tube effectively.
According to above-mentioned purpose of the present invention, a kind of Polarizer of multi-domain vertical alignment liquid crystal displays is proposed.First part of this Polarizer is adjacent with backlight, comprises protective film, linear polarizing film, double shaft extensioning film and quarter-wave phasic difference film in regular turn by backlight to multiple domain vertical orientation liquid crystal layer.The second portion of Polarizer then is positioned at the opposite side of multi-zone vertical alignment nematic liquid crystal layer, begins to comprise in regular turn quarter-wave phasic difference film, double shaft extensioning film, linear polarizing film and protective film by the multi-zone vertical alignment nematic liquid crystal layer.
Utilize above-mentioned two parts to form a Polarizer, be used for multi-domain vertical alignment liquid crystal displays, wherein quarter-wave phasic difference film can make linearly polarized light originally change circularly polarized light into, utilize the characteristic of circularly polarized light to eliminate the known dark line problem of cross, with the brightness of raising multi-domain vertical alignment liquid crystal displays, and then reduce the demand of its electric power and the loss of backlight lighting tube.
In Polarizer of the present invention, the absorption axes of two linear polarizing films must be mutually vertical, bright dark during with the pixel operation of mutual collocation control LCD.In addition, the slow axis of two quarter-wave phasic difference films (slow axis) also must be vertical mutually, after making linearly polarized light be changed into circularly polarized light or elliptically polarized light by first quarter-wave phasic difference film, can be fully by second quarter-wave phasic difference film switched back polarized light again.
Because the wavelength of visible light scope is 400nm to 700nm, therefore the centre wavelength of above-mentioned quarter-wave phasic difference film can be selected usually between between the 480nm to 600nm, to reach best result of use.In addition, the present invention also provides a wideband (broad band) quarter-wave phasic difference film, makes Polarizer of the present invention can both obtain good compensation in the whole visible wavelength range of wavelength 400nm to 700nm.
According to a preferred embodiment of the present invention, light passes through protective film, linear polarizing film, double shaft extensioning film, quarter-wave phasic difference film, multi-zone vertical alignment nematic liquid crystal layer, quarter-wave phasic difference film, double shaft extensioning film, linear polarizing film and protective film in regular turn by backlight.
According to another preferred embodiment of the present invention, light passes through protective film, linear polarizing film, quarter-wave phasic difference film, double shaft extensioning film, multi-zone vertical alignment nematic liquid crystal layer, double shaft extensioning film, quarter-wave phasic difference film, linear polarizing film and protective film in regular turn by backlight.
According to another preferred embodiment of the present invention, when the angle between the slow axis of the absorption axes of linear extension film and quarter-wave phasic difference film is 45 when spending, quarter-wave phasic difference film can convert linearly polarized light to circularly polarized light, be that the polarisation of light direction can be evenly distributed in all directions along with the time variation, this moment, the compensation effect of Polarizer was best.In addition, the slow axis of two double shaft extensioning films in the present invention is vertical mutually, and the slow axis of each double shaft extensioning film then can obtain optimized viewing angle compensation effect when also the absorption axes of each adjacent linear polarizing film is mutually vertical with it respectively.
According to a preferred embodiment more of the present invention, make up 1/1st a wavelength phasic difference film and a quarter-wave phasic difference film, obtain being equivalent to the polarization phase fruit of wideband quarter-wave phasic difference film.When using this wideband quarter-wave phasic difference film, both folded angles of absorption axes of the slow axis of 1/2nd wavelength phasic difference films wherein and the linear polarizing film that is adjacent, its angular range is between 0 to 40 degree.And both folded angles of absorption axes of the slow axis of quarter-wave phasic difference film wherein and the linear polarizing film that is adjacent, its angular range is then between 50 to 85 degree.
The present invention utilizes a quarter-wave phasic difference film, the linearly polarized light that originally enters the multi-zone vertical alignment nematic liquid crystal layer is converted to circularly polarized light, to avoid the linearly polarized light of single direction, by toward the liquid crystal molecule influence that is parallel to or the absorption axes direction of lower linear polarizing film is toppled over, and produce the problem that presents the dark line of cross in the liquid crystal pixel centre.Therefore, the present invention can improve the utilization factor of light effectively, increases the brightness of LCD when bright attitude, and prolongs the serviceable life of backlight lighting tube.
(4) description of drawings
For above-mentioned and other purposes of the present invention, characteristics and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. is elaborated as follows:
Figure 1A is the synoptic diagram of the liquid crystal panel of known multi-zone vertical alignment nematic.
Figure 1B is the synoptic diagram of the Liquid Crystal Molecules Alignment direction among Figure 1A.
Fig. 2 A is the synoptic diagram of a preferred embodiment of the present invention.
Fig. 2 B is the synoptic diagram of another preferred embodiment of the present invention.
Fig. 3 A be the absorption axes of linear extension film of the present invention and quarter-wave phasic difference film slow axis concern synoptic diagram.
Fig. 3 B be the absorption axes of linear extension film of the present invention and quarter-wave phasic difference film slow axis concern synoptic diagram.
Fig. 4 be the absorption axes of linear extension film of the present invention and double shaft extensioning film slow axis concern synoptic diagram.
Fig. 5 A is the synoptic diagram of another preferred embodiment of the present invention.
Fig. 5 B is the synoptic diagram of a preferred embodiment more of the present invention.
(5) embodiment
For high power consumption and the high problem of generating heat of improving known multi-zone vertical alignment nematic display, the present invention proposes a kind of Polarizer of multi-domain vertical alignment liquid crystal displays.
The Polarizer of multi-domain vertical alignment liquid crystal displays of the present invention is made up of two parts.First part of this Polarizer is adjacent with backlight, comprises protective film, linear polarizing film, double shaft extensioning film and quarter-wave phasic difference film in regular turn by backlight to multiple domain vertical orientation liquid crystal layer.The second portion of Polarizer then is positioned at the opposite side of multi-zone vertical alignment nematic liquid crystal layer, begins to comprise in regular turn quarter-wave phasic difference film, double shaft extensioning film, linear polarizing film and protective film by the multi-zone vertical alignment nematic liquid crystal layer.
Utilize above-mentioned two parts to form a Polarizer that is used for multi-domain vertical alignment liquid crystal displays, wherein quarter-wave phasic difference film can make linearly polarized light originally change circularly polarized light into, utilize the characteristic of circularly polarized light to eliminate the known dark line problem of cross, with the brightness of raising multi-domain vertical alignment liquid crystal displays, and then reduce the demand of its electric power and the loss of backlight lighting tube.
Polarizer of the present invention, wherein the absorption axes of two linear polarizing films must be mutually vertical, bright dark during with the pixel operation of mutual collocation control LCD.In addition, the slow axis of two quarter-wave phasic difference films also must be vertical mutually, make linearly polarized light after being changed into circularly polarized light by first quarter-wave phasic difference film, can be fully by second quarter-wave phasic difference film switched back polarized light again.
Because the wavelength of visible light scope is 400nm to 700nm, therefore the centre wavelength of above-mentioned quarter-wave phasic difference film can be chosen near the 550nm usually, to reach best result of use.In addition, the present invention also provides a wideband (broad band) quarter-wave phasic difference film, makes Polarizer of the present invention can both obtain good compensation in the whole visible wavelength range of wavelength 400nm to 700nm.
Fig. 2 A is the synoptic diagram of a preferred embodiment of the present invention.In this preferred embodiment, the Polarizer of multi-domain vertical alignment liquid crystal displays of the present invention is made up of two Polarizer part 202a and 204a.Partly 202a is adjacent with backlight for Polarizer, comprises protective film 212, linear polarizing film 214, double shaft extensioning film 216 and quarter-wave phasic difference film 218 in regular turn by backlight to multiple domain vertical orientation liquid crystal layer 206.Another Polarizer part 204a then is positioned at the opposite side of multi-zone vertical alignment nematic liquid crystal layer 206, comprises quarter-wave phasic difference film 228, double shaft extensioning film 226, linear polarizing film 224 and protective film 222 in regular turn by 206 beginnings of multi-zone vertical alignment nematic liquid crystal layer.
Polarizer of the present invention is to utilize quarter-wave phasic difference film 218, will be screened and prepare to enter the linearly polarized light of multi-zone vertical alignment nematic liquid crystal layer 206 by linear polarizing film 214, changes circularly polarized light into.Because circularly polarized light can be positioned at two adjacent orientations zone intersections and be parallel to or the liquid crystal molecule effect of the absorption axes of infrabasal plate by above-mentioned, therefore can use the known dark line problem of cross of elimination.Then, utilize the opposite side that is positioned at multi-zone vertical alignment nematic liquid crystal layer 206 again, and another quarter-wave phasic difference film 228 symmetrical with quarter-wave phasic difference film 218 positions changed back polarized light with circularly polarized light, for the usefulness of linear polarizing film 224 screenings.
In addition, in the present invention, the double shaft extensioning film of two Polarizer part 202a in 204a can exchange with the position of quarter-wave phasic difference film, do not limited by the arrangement mode of embodiment among Fig. 2 A.But, be noted that through order after the arrangement after exchanging must be that the center becomes a symmetry to arrange with multi-zone vertical alignment nematic liquid crystal layer 206 still, so just can obtain compensation effect completely.
Fig. 2 B is the synoptic diagram of another preferred embodiment of the present invention.Location swap between double shaft extensioning film 216 among the Polarizer part 202b and the quarter-wave phasic difference film 218, and the double shaft extensioning film 226 among another Polarizer part 204b and the position between the quarter-wave phasic difference film 228 also exchange.
Light passes through protective film 212, linear polarizing film 214, quarter-wave phasic difference film 218, double shaft extensioning film 216, multi-zone vertical alignment nematic liquid crystal layer 206, double shaft extensioning film 226, quarter-wave phasic difference film 228, linear polarizing film 224 and protective film 222 in regular turn by backlight.Like this, the Polarizer of Fig. 2 B also can obtain with Fig. 2 A in the identical effect of Polarizer.
The characteristic of two linear polarizing films among the present invention in applied two linear polarizing films and the known LCD is identical, that is to say, the absorption axes of two linear polarizing films must be vertical mutually up and down, shows the function of bright state or dark state to realize the control liquid crystal pixel.And, the slow axis of two quarter-wave phasic difference films among the present invention also must be vertical mutually, make linearly polarized light after being changed into circularly polarized light or elliptically polarized light by first quarter-wave phasic difference film, can be fully by second quarter-wave phasic difference film switched back polarized light again.
Below be example with the embodiment of Fig. 2 A, the transfer process of above-mentioned light polarization direction is described.At first, the light of backlight has single linear polarization through being converted into linearly polarized light by linear polarizing film 214 behind the linear polarizing film 214.Then this linearly polarized light can pass through quarter-wave phasic difference film 218.Based on the optical characteristics of quarter-wave phasic difference film, this quarter-wave phasic difference film 218 can be converted to circularly polarized light or elliptically polarized light with linearly polarized light.
Circularly polarized light or the polarization direction of elliptically polarized light can rotate in time becomes one circular or oval, therefore by multi-zone vertical alignment nematic liquid crystal layer 206 time, can avoid the problem of the above-mentioned dark line of cross by many polarization directions.And by behind the multi-zone vertical alignment nematic liquid crystal layer 206, this circularly polarized light or elliptically polarized light can pass through another quarter-wave phasic difference film 228 again.As previously mentioned, this quarter-wave phasic difference film 228 must be vertical mutually with the slow axis of quarter-wave phasic difference film 218, like this could be with the circularly polarized light after above-mentioned being converted or elliptically polarized light switched back polarized light again, for after the usefulness of linear polarizing film 224 screenings.
For the absorption axes of above-mentioned linear extension film 214 and 224 and the slow axis of quarter-wave phasic difference film 218 and 228, the present invention also proposes preferable relation between the two in another preferred embodiment, with optimization compensation effect of the present invention.When the angle between the slow axis of the absorption axes of linear extension film 214 and 224 and quarter-wave phasic difference film 218 and 228 is 45 when spending, quarter-wave phasic difference film 214 and 224 can convert linearly polarized light to one circularly polarized light completely, is not an elliptically polarized light.That is to say that this moment, the polarisation of light direction can be evenly distributed in all directions along with the time variation, therefore under this situation, the compensation effect of Polarizer of the present invention is best.
Fig. 3 A and Fig. 3 B are respectively the synoptic diagram of another preferred embodiment of the present invention, illustrate that angle between the slow axis of the absorption axes of above-mentioned linear extension film 214 and 224 and quarter-wave phasic difference film 218 and 228 is 45 two kinds of situations when spending.The absorption axes 314 that at first is noted that the linear polarizing film 214 among this two figure is horizontal direction, and the absorption axes 324 of linear polarizing film 224 then is a vertical direction.
Among Fig. 3 A, the slow axis 318a of quarter-wave phasic difference film 218a is vertical mutually with the slow axis 328a of quarter-wave phasic difference film 228a, and respectively with the absorption axes 314 of linear polarizing film 214 and 224 and 324 folders, one miter angle.Similarly, among Fig. 3 B, the slow axis 328b of the slow axis 318b of quarter-wave phasic difference film 218b and quarter-wave phasic difference film 228b is also vertical mutually, and also all presss from both sides a miter angle with the absorption axes 314 and 324 of linear polarizing film 214 and 224 respectively.
In addition, mutually vertical between the slow axis of two double shaft extensioning films among the present invention, and when the absorption axes of each adjacent linear polarizing film is vertical mutually with it respectively, can obtain best viewing angle compensation effect.Fig. 4 is the synoptic diagram of another preferred embodiment of the present invention, and the preferable relation of the absorption axes of the slow axis of above-mentioned double shaft extensioning film and linear polarizing film is described.
In Fig. 4, the absorption axes 314 of the slow axis 316 of double shaft extensioning film 216 and the linear polarizing film 214 that is adjacent is vertical mutually.And the slow axis 326 of another double shaft extensioning film 226 also the absorption axes 324 with the linear polarizing film 224 that is adjacent is vertical mutually.Certainly, twin shaft absorbing membrane 216 also can be vertical mutually with 226 slow axis 316 and 326 like this, thereby can obtain best viewing angle compensation effect.
Since the wavelength of visible light scope from blue light to ruddiness greatly about between the 400nm to 700nm, therefore above-mentioned quarter-wave phasic difference film 218 and 228 centre wavelength can be chosen near 480 ~ 600nm usually, to reach best result of use.In this embodiment, quarter-wave phasic difference film 218 and 228 centre wavelength are selected between green glow 540 ~ 560 nm.But in practice, quarter-wave phasic difference film has different selectivity for different wave length, that is to say, the effect of its conversion circularly polarized light cardiac wave therein is long best, and the conversion effect of other wavelength is then decided on its frequency range scope.Therefore, common narrow frequency (narrow band) quarter-wave phasic difference film, and can't in the so big scope of visible light (between the 400nm to 700nm), all obtain good conversion effect.
Therefore, the present invention also provides a wideband (broad band) quarter-wave phasic difference film, makes Polarizer of the present invention can both obtain good conversion effect in whole visible wavelength 400nm to 700nm scope.Perhaps,, utilize the combination of 1/1st a wavelength phasic difference film and a quarter-wave phasic difference film, obtain being equivalent to the polarization phase fruit of wideband quarter-wave phasic difference film as another embodiment of the present invention.
Fig. 5 A is another preferred embodiment of the present invention, in order to the above-mentioned combination that utilizes 1/2nd wavelength phasic difference films and quarter-wave phasic difference film to be described, obtains being equivalent to the polarization effect of wideband quarter-wave phasic difference film.
Fig. 5 A adds two 1/2nd wavelength phasic difference films in the embodiment of Fig. 2 A, wherein 1/2nd wavelength phasic difference films 517 are between quarter-wave phasic difference film 218 and double shaft extensioning film 216, and another 1/2nd wavelength phasic difference film 527 is then between quarter-wave phasic difference film 228 and double shaft extensioning film 226.
In the same manner, Fig. 5 B is illustrated in and adds two 1/2nd wavelength phasic difference films among the embodiment of Fig. 2 B, wherein 1/2nd wavelength phasic difference films 517 are between quarter-wave phasic difference film 218 and double shaft extensioning film 216, and another 1/2nd wavelength phasic difference film 527 is then between quarter-wave phasic difference film 228 and double shaft extensioning film 226.
It should be noted that, among above-mentioned two embodiment, / 2nd wavelength phasic difference films 517 and 527 and quarter-wave phasic difference film 218 and 228 formed wideband quarter-wave phasic difference films, its equivalent slow axis also can be according to the preferred embodiment among Fig. 3 A and Fig. 3 B, with absorption axle clamp one miter angle of linear polarizing film 214 and 224.Like this, the quarter-wave phasic difference film of this wideband just can all convert the linearly polarized light of big wavelength coverage to circularly polarized light, and promptly the polarisation of light direction changes in time and can be evenly distributed in all directions, to obtain best conversion effect.
According to a preferred embodiment of the present invention, when using this wideband quarter-wave phasic difference film, folded angle between the absorption axes of its 1/2nd wavelength phasic difference film 517 or 527 slow axis and the linear polarizing film 214 that is adjacent or 224, its angular range are between 0 to 40 degree.And both folded angles of absorption axes of the slow axis of its quarter-wave phasic difference film 218 or 228 and the linear polarizing film 214 that is adjacent or 224, its angular range is then between 50 to 85 degree.
Among the present invention 1/4th or 1/2nd wavelength phasic difference films 218,228,517,527 below are discussed, linear polarizing film 214 and 224 and the material commonly used of protective film 212 and 222 respectively.The phasic difference film that the employed phasic difference film of the above embodiments is a uniaxial extension, its material be tributyl carbonate (polynorbornene) or polycarbonate (polycarbonate, PC).(polyvinyl alcohol, elongation property PVA) has the effect of polarisation, therefore generally is used as linear polarizing film 214 among the present invention and 224 matrix because polyvinyl alcohol (PVA).
In addition, polyvinyl alcohol (PVA) is after process is extended, and its engineering properties can reduce, and becomes cracked easily, therefore can plate protective film 212 and 222 more usually, and is cracked to prevent it.This protective film 212 and 222 material can be used triacetate fiber (triacetyl cellulose; TAC), polycarbonate (polycarbonate) or polynorbornene (polynorborene); on the one hand can protect polyvinyl alcohol (PVA), another minute face can prevent that then the linear polarizing film 214 of polyvinyl alcohol (PVA) material from bouncing back with 224.
The present invention utilizes a quarter-wave phasic difference film, the linearly polarized light that originally enters the multi-zone vertical alignment nematic liquid crystal layer is converted to circularly polarized light, to avoid the linearly polarized light of known single direction, by toward the liquid crystal molecule influence that is parallel to or the absorption axes direction of lower linear polarizing film is toppled over, and produce the problem of the dark line of cross in the liquid crystal pixel centre.Therefore, the present invention can improve the utilization factor of light effectively, increases the brightness of LCD when bright attitude, and prolongs the serviceable life of backlight lighting tube.
Though the present invention discloses as above with a preferred embodiment; yet it is not in order to limit the present invention; any person skilled in the art person without departing from the spirit and scope of the present invention; when can doing various changes and replacement, so protection scope of the present invention is when looking being as the criterion that accompanying Claim defines.
Claims (13)
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| CNB031593801A CN100338512C (en) | 2003-09-11 | 2003-09-11 | Polarizers for Multi-domain Vertical Alignment Liquid Crystal Displays |
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| CNB031593801A CN100338512C (en) | 2003-09-11 | 2003-09-11 | Polarizers for Multi-domain Vertical Alignment Liquid Crystal Displays |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100424569C (en) * | 2005-03-25 | 2008-10-08 | 斯坦雷电气株式会社 | LCD Monitor |
| CN1885124B (en) * | 2005-06-22 | 2010-05-12 | 三星电子株式会社 | Liquid crystal display device and optical film assembly used for the liquid crystal display device |
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