TWI270699B - Liquid-crystal display - Google Patents

Abstract

This invention provides a liquid-crystal display with a characteristic of capable of capturing high contrast in the VA-LCD positive inclination and the minimizing of color varying for black statuses in inclination to improve the characteristic of VA-LCD angle of view. In order to achieve the aforementioned purpose, the present invention provides a liquid-crystal display device, which characteristic are that comprises two glass substrates in the up and down, two polarizing plates located between the two glass substrates and the light-absorbing axis perpendicular to each other, a perpendicular alignment panel with positive or negative value of dielectric anisotropy located between the two polarizing plates, and a thin film layer including at least an A-plate and a C-plate, respectively. The A-plate satisfies the condition of equation 1, which is located between the two polarizing plates, and its light axis is perpendicular to the light-absorbing axis of near polarizing plate. In the range of visible light, increasing wavelength enable the phase difference to increase due to its distributed feature of reverse wavelength. The C-plate satisfies the condition of equation 2, which is located between the two polarizing plates. The thin film layer has the positive phase difference compensation characteristic and satisfies the equation 3. The liquid-crystal molecules direction of perpendicular alignment panel has a predetermined inclination angle of 75 to 90 DEG when the voltage is not applied between the two glass substrates. (Equation 1 to 3 are the same as shown as in the specification.)

Description

1270699 IX. Description of the Invention [Technical Field] The present invention relates to a liquid crystal display device for improving optical viewing angle characteristics in a liquid crystal display device (hereinafter referred to as LCD). [Prior Art]

The present invention relates to a liquid crystal display device, and more particularly to a vertically aligned liquid-crystal display (VA-) having a liquid crystal having a negative or positive dielectric anisotropy. A vertical alignment liquid crystal display device (hereinafter referred to as "VA-LCD") of a film layer composed of an A-plate and a -C-plate, which is characterized in that the black state color change of the LCD is minimized, and the optical viewing angle characteristic of the front tilt angle is improved. ). Recently, one of the biggest drawbacks in the most widely used liquid crystal display device (LCD) in the field of flat panel displays is that the viewing angle is narrow. In liquid crystal display devices, different images are seen due to different viewing angles: , due to the anisotropy of the liquid crystal; second, due to the incompleteness of the polarizing plate. In order to improve the optical viewing angle problem of one of the disadvantages of such a liquid crystal display device, it is required to achieve a dark state and a uniform brightness. In particular, the initial alignment of the liquid crystal different from the TN mode is vertical. In the VA-LCD, the problem of lowering the viewing angle characteristics is exemplified by two larger examples. The first is the viewing angle dependence of the orthogonal polarizing plate, and the second is the viewing angle correlation of the birefringence characteristics of the VA-LCD panel. With such requirements and problems, various improvements are made to the liquid crystal display device 5

1270699 The test of the viewing angle of light, the specific improvement method can be used to compensate the film, which can compensate for a narrow viewing angle caused by the change of And (folding product) caused by the angle; the other is to make the way, that is, to divide the pixel into a majority Fields, which use a viewing angle compensation film to improve the VA-LCD disclosed in the VA-LCD disclosed in U.S. Patent No. 4,889,401, in which the use of a black state for compensating the black state of the VA-LCD -C-plate compensation film (refractive index in the X-axis direction in the plane direction is set to ny, Z-axis direction refractive index η X = ny > η z ), however, since only -C-plate compensation is included The method of film is completely compensated, so that there is light leakage at the tilt angle. In addition, a compensation film example of a compensation film and a ruthenium-plate compensation film is disclosed in U.S. Patent No. 6,1 1,1,075. The VA-LCD dark state is compensated in the state of phase-pressure, but in this case, the black angle is only 20:1 at the tilt angle of 70 degrees, and if there is better viewing angle compensation, Contrast in the corner, and at the same time must improve the color in the black state [Patent Document] US Patent No. 4, 889, 4 1 2 [Patent Document] U.S. Patent No. 6,141,075 [Disclosure] It is an object of the present invention to provide a high contrast characteristic which can be improved in VA-LCD degree, and VA- is improved by minimizing variations in tilt angle. The liquid of the viewing angle characteristic of the LCD is improved by using a viewing angle of the viewing angle and the interval of the test piece in multiple fields. Specific examples: If the voltage is not applied, the dark state is set to nx, and Y is set to n ’. VA-LCD does not have the disadvantage. The collision contains -C-plate compensation, no power is applied. Although there is a better complement, the minimum contrast improves the front tilt color change. A black crystal display device with a front tilt angle. 6 1270699

In order to achieve the foregoing object, the present invention provides a liquid crystal display device comprising: two upper and lower glass substrates; two polarizing plates positioned between the two glass substrates and having mutually perpendicular light absorption axes; And a vertical facing panel having a negative or positive dielectric anisotropy; and a film layer comprising at least one layer of A-plate and - plate. The A-plate satisfies the condition of the following formula 1, located between the two polarizing plates, and its optical axis is perpendicular to the absorption axis of the adjacent polarizing plate. In the visible light range, the wavelength increases, and the phase difference has a reverse wavelength. The addition of the C-plate to the dispersion characteristics satisfies the condition of the following mathematical formula 2 and is located between the two polarizing plates. The film layer has a positive phase difference compensation characteristic, and satisfies the following formula 3: the direction of the liquid crystal molecules of the vertical alignment panel is 75 to 90 degrees when no voltage is applied between the two glass substrates. Pretilt angle. [Expression 1] nx > ny = nz (wherein nx is a refractive index in the x-axis direction in the plane of the film, ny is a refractive index in the y-axis direction in the plane, and nz is a refractive index in the thickness direction of the film. [Math 2] nx = ny > nz (where nx is the refractive index in the x-axis direction in the plane of the film, ny is the refractive index in the y-axis direction in the plane, and nz is the folding in the thickness direction of the film) Rate.) [Math 3] The glass film is matched with C-R90, and the glass film is shot at 50 nm < Rc + RvA^150 nm 7 1270699, where Rc is the phase difference of -C-plate 'The rva is the phase difference value of the vertical alignment panel.) The pretilt angle is 87 to 90 degrees, and preferably 89 to 90 degrees. The phase difference of the liquid crystal layer of the vertical alignment panel is 80 to 400 nm at a wavelength of 55 Å, and preferably 80 nm to 300 nm. Direction of the molecule When a voltage is applied, the director of the vertical alignment panel is at 45 degrees to the absorption axis of the polarizing plate. >fe400nm^550nm'700nm-^^J|*~r^ φ Inversely, the respective phase difference values of the A-plates Ra, 40G, Ra, 5 5 0, Ra, 70G satisfy the following narrative j ^ meaning The conditions for building 4 and 5 are built. [Math 4] 0.6 <Ra, 40〇/Ra, 550^0-9 [Math 5] 1. 1^Ra, 70〇/Ra, 550^1 .5 5 50-50 wavelengths of the -C- The rhinorrhea* of the plate has a phase difference of -100 nm to -400 nm. The relative phase difference of 400 nm, 5 50 nm φ a , T of the -C· plate • (R_C, 40〇/RC, 550) is greater than the vertical alignment, and the relative phase difference of J from the plate is 5 50 nm. The relative phase difference in 700 nm is wide. 〇: 70〇/Ι1-(:, 550) is smaller than the relative phase difference of the vertical alignment panel. 'The relative phase difference between T W and degree in the 400 nm and 550 nm of the -C-plate. (R-C, 40〇/R-C, 550) is in the range of 1.1 to 1.3 祀 w ′ and 550 nm , 700 nm

The relative phase difference (R C, 7〇〇/R-c, 55〇) in the thickness direction is in the range of 0.8 to 0.9. The A-plate has a phase value in the range of 13 〇 nrn to 200 nm 8 1270699 at a wavelength of 550 nm, and preferably in the range of 130 nm to 160 nm. The foregoing objects, features, and advantages of the invention will be apparent from the accompanying drawings and appended claims. Hereinafter, the configuration and operation of the present invention will be described in detail below with reference to the accompanying drawings. [Embodiment]

1 to 7 illustrate a VA-LCD according to the present invention. The VA-LCD liquid crystal cell is disposed between the two polarizing plates by two polarizing plates 100 and 110 separated from each other by the absorption axis. The vertical alignment panel 200 is configured by a film layer disposed between the two polarizing plates and the vertical alignment panel. The film layer is constructed to contain one or more A-plates 300, 310 and -C-plate 400. Wherein, the polarizing plate has a TAC (triacetate cellulose) protective film having a phase difference in the thickness direction, or another protective film having no phase difference in the thickness direction. 1 to 4 are a VA-LCD liquid crystal cell structure according to Embodiments 1 to 4, each of which uses one of the A-plate 300 or 310 and the -C-plate 400, and is disposed vertically. The alignment panel 200 is spaced between the two upper and lower polarizing plates 1 1 0 and 1 相互 perpendicular to each other and maintained at an interval of 3 to 8 // m. The first example shows that the A-plate 300 is disposed between the vertical alignment panel 200 and the lower polarizer 100, and the -C-plate 400 is disposed on the vertical alignment panel 200 and the upper polarizer. Between 110. The optical axis of the A-plate 300 is perpendicular to the absorption axis of the lower polarizing plate 100. Fig. 2 shows a second embodiment in which the A-plate 3 10 is disposed between the vertical alignment panel 9 1270699 200 and the upper polarizing plate 110, and the -C-plate 400 is disposed between the vertical alignment panel 200 and the lower polarizing plate 100. The optical axis of the A-plate 310 is perpendicular to the absorption axis of the upper polarizing plate 110. Fig. 3 shows a third embodiment in which an A-plate 3 10 and a -C-plate 400 are successively disposed between the vertical alignment panel 200 and the upper polarizing plate 110. The optical axis of the A-plate 3 10 is perpendicular to the absorption axis of the upper polarizing plate 110.

Fig. 4 shows a fourth embodiment in which the positions of the A-plate 310 and the -C-plate 400 of Fig. 3 are successively arranged between the vertical alignment panel 200 and the upper polarizing plate 110. The optical axis of the A-plate 310 is perpendicular to the absorption axis of the upper polarizing plate 110. FIGS. 5 and 6 show a VA-LCD liquid crystal cell structure according to Embodiments 5 and 6, which uses both A-plates 300 and 310 and a-C-plate 400, and respectively arranges them in and The vertical alignment panel 200 is perpendicular to the two upper and lower polarizing plates 11 0 and 100, and is kept at an interval of 3 to 8 // m. Fig. 5 is a fifth embodiment, in which the A-board 300 is disposed between the vertical alignment panel 200 and the lower polarizing plate 100, and the A-board 3 1 0 and the -C-plate 400 are successively arranged. The vertical alignment panel 200 is between the upper polarizing plate 1 1 0 and the upper polarizing plate 1 1 0. The optical axis of the A-plate 300 disposed between the vertical alignment panel 200 and the lower polarizing plate 100 is perpendicular to the absorption axis of the lower polarizing plate 100, and is disposed on the vertical alignment panel 200 and above. The optical axis of the A-plate 310 between the polarizing plates 110 is perpendicular to the absorption axis of the upper polarizing plate 110. 6 is a sixth embodiment, the A-plate 3 10 is disposed between the vertical alignment panel 200 and the upper polarizing plate 110, and the A-board 300 and the -C-plate 400 are successively disposed on the vertical alignment panel 2 0 0 . Between the lower polarizer and the lower polarizer. The optical axis of the A-board 310 disposed between the vertical alignment panel 200 and the upper polarizing plate 垂直 is perpendicular to the absorption axis of the upper polarizing plate no, and is disposed in the vertical alignment panel 200 and the lower polarizing plate 100. The optical axis of the A-plate 300 is perpendicular to the absorption axis of the lower polarizing plate 100. 7 is a VA-LCD liquid crystal cell structure of Embodiment 7, which is configured to use both A-plates 300, 310 and a two-C-plate 400, and is disposed perpendicular to the vertical alignment panel 200, respectively. Two upper and lower polarizers no,

Between 1 and 00, and keep the interval of 3~8 // m. The A plate 3 00 and the -C plate 400 are sequentially disposed between the vertical alignment panel 200 and the lower polarizing plate 1 , and the A - plate 3 10 and the other - C - plate 400 are sequentially disposed in the vertical direction. The alignment panel 200 is between the upper polarizing plate 1 1 〇. The optical axis of the A-plate 300 disposed between the vertical alignment panel 200 and the lower polarizing plate 1 is perpendicular to the absorption axis of the lower polarizing plate 100, and is disposed on the vertical alignment panel 200 and the upper polarizing The optical axis of the A-plate 3 10 between the plates 1 1 〇 is perpendicular to the absorption axis of the upper polarizing plate 1 10 . Figure 8 is a graph showing the ratio of the phase difference in the thickness direction at a wavelength of 4 〇〇 nm to the phase difference in the thickness direction at a wavelength of 55 Onm applied to the film of the film layer of the present invention (R_C4〇〇/R_c, 55). 〇), and the relationship between the phase difference (R v A, 5 5 〇) of the VA-LCD liquid crystal cell thickness direction at 550 wavelength. The sum of the phase difference values (R va + R · c > 0 ) of the vertical alignment panel of the present invention and the thickness direction of the -C-plate generally has a positive value, and compensates for the thickness direction of the -C-plate required for the VA-LCD. The phase difference value (Rmo) can be obtained by the following equation. Rva(55〇) +Rc(55〇) = l〇〇nm~130nm (average ii5nm) where RVA( 5 5 0 ) = (dxAn55〇)VA refers to the thickness of the vertical alignment 11 1270699 panel at 5 50 wavelength The phase difference of the direction, Rc (55 〇) is the phase difference in the thickness direction of the -C-plate at a wavelength of 550 nm. The desired wavelength dispersion value (Δru/An55〇)-c can be calculated from the following equation with respect to the phase difference of the -C-plate. (Aru/An550) VAxRVA (55〇) + (AiuMn55〇)-cxR-c(55〇)=115nm. Where (Δηλ/Δη55〇)νΑ represents the phase difference in the thickness direction of the VA-LCD°

In particular, for any wavelength (λ = 400 nm), (An4〇〇Mn55〇)VA><RvA(55〇) + (An4〇〇/An55〇)-cXR-c(55〇)=l 1 5n m , relative to the RvA (500) -C - plate thickness direction phase difference RC (40G) / RC (550) = (△ ΙΜοο / Δη〗.) -. The calculation results of the relative values are shown in the above-mentioned Fig. 8. The optimum condition for the in-plane retardation value of the Α-plate = 0.2 5 λ must be a λ/4 achromatic quarter wave film with colorless characteristics. Therefore, the relative phase difference is R4 〇〇 / R55〇=400/5 50 = 0.727 R7〇〇/R55〇= 700/550=l.273 The film layer of the VA-LCD of the present invention described above has the following characteristics. Configuring a film layer between the vertical alignment panel and the upper and lower polarizing plates to form a VA-LCD liquid crystal cell having a positive phase difference compensation characteristic, the film layer including at least one of an A-board or a -C-plate , the in-plane refractive index (nx, ny) of the A-plate and the refractive index (nz) in the thickness direction are nx> ny=nz, 12 1270699 - C-plane in-plane refractive index (nx, ny) and thickness direction The refractive index (^) is nx=ny> nz, and the A-plate has a reversed wavelength dispersion in which the phase difference value also increases as the wavelength increases in the visible light range, and the optical axis is configured to be adjacent to the polarized light. The absorption axis of the plate is vertical, and includes a sum of phase difference values (R_C + RVA ) in the thickness direction of the -C-plate and the vertical alignment panel, and is in a range of 5 〇 nm to 15 〇 nm in the visible light range. In addition, the direction of the liquid crystal molecules of the vertical alignment panel in the state where no voltage is applied, between the vertical alignment panel and the lower glass substrate, has a pretilt angle ranging from 75 to 90 degrees, and the pretilt angle is 87~ 9 is preferred. The pretilt angle is preferably 89 to 90 degrees. Moreover, the phase difference of the liquid crystal layer formed in the vertical alignment panel is at a wavelength of 5 5 Onm, in the range of 80 to 40 Onm, and the phase difference of the liquid crystal layer formed in the vertical alignment panel is 550 nm. At a wavelength, a value of 80 to 300 nm is preferred. Further, the polishing direction of the liquid crystal injected into the vertical alignment panel is 45 degrees from the absorption axis of the polarizing plate. The A-plate has a phase difference of 130 to 200 nm at a wavelength of 550 nm, and a phase difference of 130 to 160 nm at a wavelength of 550 nm of the A-plate is preferred. The phase difference ratio (Ra, 45〇/Ra, 550) of the thickness direction of the A-plate at the two wavelengths of 40 Onm and 550 nm is in the range of 0.6 to 0.9; and at the two wavelengths of 7 〇〇 nm, 5 The relative thickness direction phase difference ratio (ra, 7 〇〇 / Ra, 55 〇) at 50 nm is preferably in the range of 1:1 to 1.5. Moreover, the -C-plate has a phase difference in thickness direction at a wavelength of 550 nm of 13 1270699

In the range of -100 nm to -400 nm, the relative phase difference ratio (Rc, 4〇〇/Rc, 55〇) of the -C-plate at two wavelengths of 400 nm and 550 nm is greater than the relative phase difference of the vertical alignment panel. The relative phase difference ratio (RC, 70〇/RC, 550) at two wavelengths of 550 nm and 700 nm is smaller than the relative phase difference of the vertical alignment panel, in particular, the -C-plate is at a wavelength of 400 nm. The thickness direction relative phase difference (Rc, 4〇〇/Rc, 55〇) in 550nm is in the range of 1.1 to 1.3, and the relative phase difference in the thickness direction of the two wavelengths 550nm and 700nm (RC, 70〇) /RC, 550) is preferably in the range of 〇·8 to 0.9. Fig. 9 through Fig. 2 2 show simulation results obtained by the embodiments of the present invention. In the ninth and eleventh figures, the color coordinates indicate that the tilt angle of the range of 0 to 80 degrees is changed by 2 degrees and the white light is used at any azimuth angle, and the present invention is used. The simulation results of the contrast ratios of the VA-LCDs of the respective embodiments; in the 10th and 12th figures, the VA-LCDs disclosed in the embodiments of the present invention are displayed at azimuth of 45 degrees in color coordinates. The color change simulation results in the black state were performed. The phase difference compensation characteristics of the liquid crystal display device of the present invention described above will be described in detail below through the first to seventh embodiments. The examples are only for the purpose of making the invention easier to understand and not to limit the invention. <Examples 1 to 3> A VA-LCD was separately produced in the order shown in Figs. 1 to 3, in which the vertical alignment panel used used a vertical alignment panel having a gap of 3 # m. And the pretilt angle is 89 degrees, the dielectric anisotropy is Δε = -4.9, the refractive index anisotropy △!! = 0.0979, the wavelength dispersion characteristic ^ 114 0 0 / ^ 115 5 0 = 1.0 979 of VA-LCD . 14 1270699 Therefore, the phase difference in the thickness direction of the 'vertical alignment panel' is Rva (55 〇) = 2 9 7 nm. The 〇-C-plate is made of a liquid crystal film, and the phase difference in the thickness direction is RC (55 〇) = -190 nm. The wavelength dispersion characteristic is r_c(4〇〇)/r_c(55〇) = 1.31. The A-plate is made of hardened nematic liquid crystal with a phase difference Ra in the plane (55 (〇 = 145 nm, wavelength dispersion characteristic is

Ra(4 0 0 )/Ra( 5 5 0 ) = 〇.72. • Figure 9 shows the simulation results for the contrast ratio of the tilt angles in the azimuth angle of 〇~80 degrees; the i-th image is represented by the xy color square; f is shown for the 45 degree azimuth The simulation result of the black state of the VA-LCD with a tilt angle of ～8〇 range. <Example 4> A VA-LCD was fabricated in the order shown in Fig. 4, in which the vertical alignment panel used used a vertical alignment panel having a gap of 4 # m. Further, the pretilt angle is 89 degrees, the dielectric anisotropy is Δε = _4 9, the refractive index anisotropy is ^ 0.0 9 79, and the wavelength dispersion characteristic Δη4 〇〇 / Δη55 〇 = 1 · 〇 979 va_lcd. _ Therefore the phase difference in the thickness direction of the 'vertical alignment panel' is RVA ( 5 5 0 ) = 3 96 nm. The 〇 plate is made of liquid crystal, and the phase difference in the thickness direction is RC ( 5 5 0 ) 9 'C wavelength dispersion of the C plate The characteristic is R_c(4〇〇)/R_c(55〇)=1.21. • The A-plate is made of hardened nematic liquid crystal with a phase difference RA (55〇) = 147nm in the plane and a wavelength dispersion characteristic of

Ra(4〇o)/Ra(55〇) = 0.72 〇 Figure 9 shows the simulation results of the contrast ratio of the tilt angle in the range of 0~80 15 1270699 degrees for any azimuth angle; Figure 1 The simulation results of the black state of the VA-LCD for the tilt angle of the range of 0 to 80 degrees under the azimuth angle of 45 degrees are represented by the xy color coordinates. <Examples 5 and 6> VA-LCDs were respectively produced in the order shown in Figs. 5 and 6, and the VA-LCDs shown in Figs. 5 and 6 contained vertical alignments having a gap of 3 // m. panel. Using a pretilt angle of 89 degrees, the dielectric anisotropy is Δε = -4.9, the refractive index anisotropy Δη = 0.0979, wavelength dispersion characteristics

Liquid crystal of Δη4〇〇/Αη55〇=1.〇979. Therefore, the phase difference in the thickness direction of the vertical alignment panel is RVA (5 5 〇) = 297 nm ° - C - The plate is made of a liquid crystal film, and the phase difference Rc (55 〇) = _130 nm in the thickness direction, wavelength dispersion characteristics It is R_c(4〇o)/Rc(55〇)=1.31. The two A-plates are made of a hardened liquid crystal film. The phase difference in the plane is RA (55G) = 90nm, and the wavelength dispersion characteristics of the A-plate are

Ra(4〇o)/Ra(55〇) = 〇.72. Figure 11 shows the simulation results for the contrast ratio in the range of 0 to 80 degrees for any azimuth angle; the image of the VA color of the VA-LCD for the 45 degree azimuth is represented by the xy color coordinates in the 12th system. The simulation result of the state. <Embodiment 7> The VA-LCD shown in Fig. 7 includes a vertical alignment panel having a gap of 3 // m. The pretilt angle is 89 degrees, the dielectric anisotropy is Δε = -4.9, the refractive index anisotropy Δη = 0.0979, and the wavelength dispersion characteristic Αη4〇〇/Δη55〇 = 1.0979 16

1270699 LCD. Therefore, the phase difference in the thickness direction of the VA-panel is RVA (55 297 nm 〇 two-C-plates are made of a liquid crystal film, the phase in the thickness direction is Rc (55 〇) = -65 nm, and the wavelength dispersion characteristic is R_c ( 4〇o)/Rc(55〇)=1.31 Two A-plates are made of hardened liquid crystal film. The difference in plane is RA(55〇)=90nm, and the wavelength dispersion characteristic is Ra(4〇o)/ Ra(55〇) = 〇 Figure 11 shows the simulation results for the contrast ratio of the tilt angle of any azimuth angle ~ 80 degrees; the 1 2 is represented by the xy color coordinates for the 45 degree azimuth The simulation results of the black of the VA-LCD. According to the figure 9 and the 1st, it can be confirmed that the liquid crystal display of the present invention has high contrast characteristics at any azimuth angle; and according to the figure and the second figure It can be confirmed that the color change of the tilting black state is minimized in the liquid crystal display device of the present invention. As described above, the liquid crystal display device of the present invention can be completely blackened at the tilt angle, and can be in a black state or a bright state. And the RGB state color change is minimized to improve the viewing angle characteristics. The present invention has been described as In the scope of the invention and the technical scope of the invention, it is a matter of course that various modifications and changes can be made to the skilled person, and such modifications and modifications are of course within the scope of the appended claims. 〇) = difference 〇 phase .72. The squat diagram status shows the achievement in % 10 but it is here at 17

1270699 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of a VA-LCD cell containing a film layer of Example 1 of the present invention. Fig. 2 is a perspective view of a VA-LCD cell containing the film layer of Example 2 of the present invention. Fig. 3 is a perspective view of a VA-LCD cell containing the film layer of Example 3 of the present invention. Fig. 4 is a perspective view of a VA-LCD cell containing the film layer of Example 4 of the present invention. Fig. 5 is a perspective view of a VA-LCD cell containing the film layer of Example 5 of the present invention. Fig. 6 is a perspective view of a VA-LCD cell containing the film layer of Example 6 of the present invention. Figure 7 is a perspective view of a VA-LCD cell containing the film layer of Example 7 of the present invention. Figure 8 is a ratio (Rc, 4 〇〇 / Rc, 55 〇) between the thickness direction difference of the second retardation film at a wavelength of 400 nm and the phase value of the thickness direction of the second retardation film at a wavelength of 550 nm (Rc, 4 〇〇 / Rc, 55 〇), and The relationship between the phase difference (Rva, 55 〇) of the thickness direction of the VA liquid crystal cell at a wavelength of 550 nm. Fig. 9 is a graph showing the results of comparison of the contrast ratios when white light was used in any of the azimuth angles of 0 to 80 degrees in the film of the VA-LCD liquid crystals disclosed in Examples 1 to 4 of the present invention. Figure 10 is a perspective view of a phase difference LCD layer of a liquid crystal liquid crystal liquid crystal liquid crystal liquid crystal of 0 to 80 degrees in a 45 degree azimuth angle in a film VA-LCD liquid crystal cell according to embodiments 1 to 4 of the present invention. 18 of the layer

1270699 Tilt angle, simulation result of a change in black state when white light is changed by 2 degrees. Fig. 1 is a simulation result of the contrast ratio when white light is used for the tilt angle of 0 to 80 degrees in any azimuth angle in the film layer VA-LCD liquid crystals of Examples 5 to 7 of the present invention. Figure 12 is a view showing a tilt angle of 0 to 80 degrees in a film angle of 45 degrees azimuth in a film layer VA-LCD liquid crystal according to embodiments 5 to 7 of the present invention, using white light each time, and using white light. The simulation result of the color change situation in the black state at the time. [Description of main component symbols] 100 of the color of the polarizing plate 1 10 Polarizing plate 200 with absorption axis perpendicular to the polarizing plate 100 Vertical alignment panel 300 A - Plate 3 10 A-plate 400 with absorption axis perpendicular to A-plate 300 -C - board 19

Claims (1)

1270699 X. Patent application scope: 1. A liquid crystal display device, comprising: two upper and lower glass substrates; a polarizing plate located between the two glass substrates and having a light absorption axis perpendicular to each other; a vertical alignment panel between the polarizing plates and having a dielectric anisotropy or a positive value; and a film layer containing at least one layer of A-plate and -C-plate, the A-plate satisfying the following mathematics The condition of Equation 1 is located between the two polarizing plates, and the optical axis thereof is perpendicular to the absorption axis of the adjacent polarizing plate. In the visible light region, the wavelength is increased, and the phase difference is increased by the reverse wavelength dispersion characteristic; - the plate satisfies the condition of the following mathematical formula 2, located between the polarizing plates of the film, the film layer has a positive phase difference compensation characteristic, and satisfies the following formula 3, the direction of the liquid crystal molecules of the vertical alignment panel is When the voltage is not applied between the two glass substrates, it is a pre-negative of the range of 7 5 to 90 degrees. [Math. 1] nx>ny = nz The nx is the refractive index in the x-axis direction in the plane of the film, and the ny is the refractive index in the y-axis direction in the plane of the film, and the nz is the refractive index in the thickness direction of the film, [ Mathematical formula 2] nx = ny > nz 20 1270699 The nx is the refractive index in the x-axis direction in the plane of the film, and the ny is the refractive index in the y-axis direction in the plane of the film, and the nz is the refractive index in the thickness direction of the film. [Math 3] 50 nm < Rc + RvA^l 50 nm The R - c is the -C - plate phase difference value" The RVA is the phase difference value of the vertical alignment panel. 2. The liquid crystal display device of claim 1, wherein the pretilt angle is 87 to 90 degrees. 3. The liquid crystal display device of claim 1, wherein the pretilt angle is 89 to 90 degrees. 4. The liquid crystal display device according to claim 1, wherein the liquid crystal layer of the vertical alignment panel has a phase difference of 80 nm to 400 nm at a wavelength of 550 nm, and is liquid crystal according to item 4 of the patent application. A display device, wherein a phase difference of a liquid crystal layer of the vertical alignment panel is in a range of 80 nm to 300 nm at a wavelength of 550 nm. 6. The liquid crystal display device of claim 1, wherein the direction of the liquid crystal molecules of the vertical alignment panel is 21 when a voltage is applied. 1270699 (director) is 45 degrees from the absorption axis of the polarizing plate. 7. The liquid crystal display device according to claim 1, wherein the values of the A_plate are 11, 400, 1^, 55(), 1^, 7()0 at a wavelength of 400 nm, 550 nm, and 700 nm. The following mathematical formulas 4 and 5 [Math 4] 0.6 < RA, 4 0 〇/RA, 5 5 0 ^0 · 9 ; [Math 5] 1.1SRa, 70〇/Ra, 55〇S1.5 〇 8. The liquid crystal display device according to claim 1, wherein the thickness direction of the -C-plate is in the range of -100 nm to -400 nm. 9. The liquid crystal display device according to claim 1. The relative phase difference (R_c, 4〇〇 is greater than the relative phase difference of the vertical alignment panel, and the relative phase difference (RC, 70〇/RC, 550) in 550nm is smaller than the vertical difference in the plate at 400nm and 550nm. The relative phase difference of the J plate. 1 0. The thickness direction relative phase (R_c, 4〇〇/Rc, 55〇) in the 400nm and 550nm of the liquid crystal display device-plate according to the scope of claim 9 is 1.1. a range of ~1.3, and a relative phase difference (RC, 70 〇 / RC, 550) in the thickness direction of 550 nm, wherein the condition of the PJ phase difference; wherein the difference is in the -C- / RC, 5 5 0 ), 700 nm I alignment plane, where the difference is in the range of 7 OOnm 0.8 〜0·9 22 1270699. 11. The liquid crystal display device of claim 1, wherein the A-plate has a phase difference of from 130 nm to 200 nm at a wavelength of 550 nm. The liquid crystal display device of claim 11, wherein the A-plate has a phase difference of from 130 nm to 160 nm at a wavelength of 550 nm. twenty three