TWI435147B - Liquid crystal display panel and liquid crystal display apparatus - Google Patents

Description

Liquid crystal display panel and liquid crystal display device

The present invention relates to a liquid crystal display panel and a liquid crystal display device, and more particularly to a liquid crystal display panel and a liquid crystal display device relating to an Optically Compensated Bend Mode (OCB).

Liquid crystal displays (LCDs) are widely used in personal digital assistants (PDAs), mobile phones, and video recordings because of their high image quality, small size, light weight, low driving voltage, and low power consumption. Various electronic products such as computers, notebook computers, desktop monitors, car monitors, and projection TVs.

At present, most liquid crystal displays are Twisted Nematic (TN) liquid crystal displays, which have disadvantages such as narrow viewing angle, slow reaction speed, and large color dispersion. Compared with a twisted liquid crystal display, an optically compensated bending mode (OCB) liquid crystal display can have advantages such as wide viewing angle and high reaction speed. Among them, the TN type or OCB type liquid crystal display can be provided with a phase compensation film, which can be used to improve the viewing angle, contrast, color, color shift and gray scale of the display.

However, compared with the widespread use of phase compensation films for TN type liquid crystal displays, phase compensation films for OCB type liquid crystal displays can only be provided by very few manufacturers, and the number of phase compensation films produced is relatively small, thus greatly limiting OCB. Production and manufacture of liquid crystal displays.

Therefore, one aspect of the present invention is to provide a liquid crystal display panel and a liquid The crystal display device utilizes a phase compensation film used in a TN type liquid crystal display to compensate for an OCB type liquid crystal display.

According to an embodiment of the present invention, a liquid crystal display panel of the present invention includes a first substrate, a second substrate, a liquid crystal layer, two first phase compensation films, and two second phase compensation films. The liquid crystal layer is disposed between the first substrate and the second substrate, wherein the liquid crystal layer has liquid crystal molecules arranged in a curved arrangement. The two first phase compensation films are respectively disposed on the same side or opposite sides of the liquid crystal layer, and each of the first phase compensation films comprises a discotic liquid crystal layer and an alignment base layer having dual optical axis characteristics, wherein The alignment base layer has a first slow axis and a first fast axis perpendicular to the first slow axis, corresponding to a maximum in-plane refractive index of the first slow axis and corresponding to the first fast axis There is a first in-plane refractive index difference between the refractive indices. The second phase compensation film is disposed on at least one of the first phase compensation films, wherein each of the second phase compensation films has a second slow axis and a second perpendicular to the second slow axis a second fast axis having a second in-plane refractive index difference corresponding to a maximum in-plane refractive index of the second slow axis and a refractive index corresponding to the second fast axis, the second in-plane refractive index The difference is substantially the same as the first in-plane refractive index difference.

Further, according to an embodiment of the present invention, the above liquid crystal display panel can be applied to a liquid crystal display device.

Therefore, the liquid crystal display panel and the liquid crystal display device of the present invention can compensate the phase difference of the OCB type liquid crystal display panel by using a combination of the first phase compensation film and the second phase compensation film to ensure the manufacture and production of the OCB type liquid crystal display device.

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood. But the value It is noted that the embodiments are merely illustrative of the embodiments of the invention and are not intended to limit the invention.

Please refer to FIG. 1 , which is a schematic diagram of a backlight module and a liquid crystal display panel according to a first embodiment of the present invention. The liquid crystal display device of this embodiment includes a liquid crystal display panel 100 and a backlight module 101. The liquid crystal display panel 100 is disposed above a backlight module 101 for forming a liquid crystal display device. The backlight module 101 can be an edge illumination backlight module or a Bottom Lighting backlight module. The backlight module 101 can preferably be provided with an optical film group (not shown). Improve the backlight effect. The optical film group may be, for example, a diffusion sheet, a ruthenium sheet, a Turning Prism Sheet, a Brightness Enhancement Film (BEF), a Reflect Brightness Enhancement Film (DBEF), or a non-multilayer. Diffused Reflective Polarizer Film (DRPF) or any combination of the above. The light source (not shown) of the backlight module 200 is, for example, a Cold Cathode Fluorescent Lamp (CCFL), a Light-Emitting Diode (LED), and an Organic Light Diode (Organic Light). Emitting Diode; OLED), Electro-Luminescence (EL) or Light Bar for providing a backlight to the liquid crystal display panel 100.

Please refer to FIG. 2, which is a cross-sectional view showing a liquid crystal display panel according to a first embodiment of the present invention. The liquid crystal display panel 100 of the present embodiment may include a first polarizing plate 110, a first phase compensation film 130 and 170, a second phase compensation film 120 and 180, a first substrate 140, a liquid crystal layer 150, and a second substrate 160. And the second polarizing plate 190, the transmission axis direction of the first polarizing plate 110 is perpendicular to the transmission axis direction of the second polarizing plate 190. The liquid crystal layer 150 is disposed between the first substrate 140 and the second substrate 160, and the liquid crystal layer 150 has liquid crystal molecules that are bendably arranged, so that the liquid crystal display panel 100 can perform optical compensation bending mode. The operation of the formula (OCB) can be used as a display panel of an OCB type liquid crystal display.

As shown in FIG. 2, the first substrate 140 of the present embodiment is provided with a black matrix layer 141, a common electrode layer 142, and a first alignment layer 143, which are sequentially disposed on one side of the first substrate 140 ( Facing the direction of the liquid crystal layer 150). The black matrix layer 141 is embedded with a color filter layer (not shown) formed of a light-transmitting color photoresist material, and the material of the black matrix layer 141 is, for example, metal (for example, chromium), graphite or resin type. The material, and thus the first substrate 140, can form a color filter substrate. The common electrode layer 142 is made of a material having conductivity and light transmissivity, such as ITO, IZO, AZO, GZO, TCO or ZnO.

As shown in FIG. 2, the second substrate 160 of the present embodiment is provided with a pixel electrode layer 161, a second alignment layer 162, and a plurality of vertically intersecting gate lines and data lines (not shown) to form a thin film. A thin film transistor (TFT) substrate in which the pixel electrode layer 161 and the second alignment layer 162 are sequentially disposed on the other side of the second substrate 160 (the direction facing the liquid crystal layer 150).

As shown in FIG. 2, the first phase compensation films 130 and 170 of the present embodiment are disposed between the first polarizing plate 110 and the first substrate 140, and between the second substrate 160 and the second polarizing plate 190, respectively. The first phase compensation films 130 and 170 may be used to compensate for the phase difference of the liquid crystal layer 150 to improve characteristics such as viewing angle, contrast, color, color shift, and gray scale of the liquid crystal display panel 100. The first phase compensation films 130 and 170 may respectively include an alignment base layer 102 and a discotic liquid crystal (DLC) layer 103 formed on the alignment base layer 102 to form an optically anisotropic layer. . Wherein the ligand has a base layer 102 positioned on the same plane and the slow axis orthogonal to the first fast axis and a first x ₁ y _1, with the maximum in-plane refractive indices nx on this base layer 102 having a first slow _{axis. 1} x ₁ , with the maximum in-plane refractive indices ny having the base layer 102 in this first fast axis y _{1 1} corresponds to the maximum within a first plane slow axis x ₁ nx ₁ and a refractive index corresponding to the first fast axis y having a refractive index difference between the first inner surface (nx ₁ -ny ₁₎ between the refractive index ny of _{1 1.} In one embodiment, the alignment base layer 102 has a plastic base layer (such as cellulose triacetate TAC) and an alignment layer (such as PI or PVA, etc.).

In this embodiment, the axial direction of the alignment base layer 102 of the first phase compensation film 130 or 170 is aligned with the rubbing direction of the discotic liquid crystal layer 103, and can be applied to the TN type liquid crystal display, that is, the present embodiment. The phase compensation films 130 and 170 of the example may be phase compensation films used in a TN type liquid crystal display.

Referring to FIG. 3, a schematic diagram of a liquid crystal layer, a first phase compensation film, and a second phase compensation film according to a first embodiment of the present invention is shown. The second phase compensation films 120 and 180 of the present embodiment are disposed between the first polarizing plate 110 and the first phase compensation film 130, and between the first phase compensation film 170 and the second polarizing plate 190, respectively. The materials of the second phase compensation films 120 and 180 may be substantially the same as the alignment base layer 102 of the first phase compensation film 130, 170, such as cellulose triacetate (TAC), and the thickness and optical characteristics of the second phase compensation films 120, 180. The thickness and optical properties are substantially the same as the alignment base layer 102. Each of the second phase compensation films 120, 180 has a second slow axis x ₂ and a second fast axis y ₂ that are on the same plane and perpendicular to each other, which respectively correspond to the first slow axis x _{1 of the} alignment base layer 102 and a first fast axis y _1, each of the second phase compensation films 120 and 180 having a maximum in-plane refractive indices nx ₂ on this second slow axis x _2, each of the second phase compensation films 120 and 180 in this second ₂ on the fast axis y has a refractive index ny _2, corresponds to between ₂ and corresponding with a second refractive index ny the fast axis of the inner surface of a second maximum in-plane refractive indices nx x ₂ of the second shaft ₂ slow Refractive index difference (nx ₂ -ny ₂ ). The second in-plane refractive index difference (nx ₂ -ny ₂ ) is substantially the same as the first in-plane refractive index difference (nx ₁ -ny ₁ ).

In this embodiment, the second phase compensation films 120 and 180 can be directly attached to the first phase compensation films 130 and 170, respectively. Furthermore, in the present embodiment, the axial directions of the second phase compensation films 120 and 180 are perpendicular to the axial directions of the first phase compensation films 130 and 170, that is, the second phase compensation films 120 and 180 are rotated by 90 degrees. Bonded to the first phase compensation films 130, 170, at this time, the first slow axis x ₁ of the first phase compensation films 130, 170 and the second fast axis y ₂ of the second phase compensation films 120, 180 are tied In the same direction, the first fast axis y ₁ of the first phase compensation films 130, 170 and the second slow axis x ₂ of the second phase compensation films 120, 180 are in the same direction.

When the second phase compensation films 120, 180 of the present embodiment are attached to the phase compensation films 130, 170, the second phase compensation films 120, 180 and the first phase compensation films 130, 170 may be equivalent to a negative C type. The optical effect of the plate (-C plate) to compensate for the forward phase difference of the liquid crystal layer 150. Therefore, the combination of the second phase compensation films 120, 180 and the first phase compensation films 130, 170 can be used to compensate for the phase difference of the liquid crystal molecules in the curved arrangement of the liquid crystal layer 150, that is, to compensate for the optical compensation bending (OCB) type liquid crystal display. The phase difference of the panel.

Therefore, when the phase compensation film dedicated to the OCB type liquid crystal display device cannot be obtained, the first phase compensation films 130 and 170 of the present embodiment can be simultaneously applied to the TN type liquid crystal display panel and the OCB type liquid crystal display panel to ensure OCB. Manufacturing and production of liquid crystal display devices. When applied to an OCB type liquid crystal display panel, the first phase compensation films 130, 170 may combine the second phase compensation films 120, 180 to be equivalent to the optical effect of the negative C-type plate to compensate for the forward phase difference.

Referring to FIG. 4, a schematic diagram of a liquid crystal layer, a first phase compensation film, and a second phase compensation film according to a second embodiment of the present invention is shown. Only the differences between the present embodiment and the first embodiment will be described below, and the similarities are not described herein again. Compared with the first embodiment, the axial direction of the second phase compensation films 220, 280 of the second embodiment has an angle of 45 degrees (45 degrees) between the axial directions of the first phase compensation films 230, 270, That is, the second phase compensation films 220 and 280 are rotated by 45 degrees to be bonded to the phase compensation films 230 and 270. At this point, the two clips are 45 degrees. The combination of the second phase compensation films 220, 280 and the first phase compensation films 230, 270 may also be equivalent to the optical effect of the negative C-type plate to compensate for the phase difference of the OCB type liquid crystal display panel.

Referring to FIG. 5, a schematic diagram of a liquid crystal layer, a first phase compensation film, and a second phase compensation film according to a third embodiment of the present invention is shown below. Only the difference between the present embodiment and the first embodiment is different. The description is made, and the similarities are not described here. Compared with the first embodiment, the first phase compensation films 330, 370 of the third embodiment are respectively located on opposite sides of the liquid crystal layer 150, and the second phase compensation films 320, 380 are located on the same side of the liquid crystal layer 150. For example, it is located on the first phase compensation film 330. At this time, the two second phase compensation films 320, 380 can form a second phase compensation film of twice the thickness and are attached to the first phase compensation film 330 for equivalent to the optical effect of the negative C-type plate. The phase difference of the OCB type liquid crystal display panel can be compensated.

Referring to FIG. 6, a schematic diagram of a liquid crystal layer, a first phase compensation film, and a second phase compensation film according to a fourth embodiment of the present invention is shown below. Only the difference between the present embodiment and the first embodiment is different. The description is made, and the similarities are not described here. Compared with the first embodiment, the first phase compensation films 430, 470 and the second phase compensation films 420, 480 of the fourth embodiment are located on the same side of the liquid crystal layer 150, and the second phase compensation films 420, 480 are located. The first phase compensation film 430 and 470 are between. At this time, the combination of the first phase compensation films 430, 470 and the second phase compensation films 420, 480 can also form an optical effect of the negative C-type flat plate to compensate for the phase difference of the OCB type liquid crystal display panel.

According to the embodiment of the present invention, the liquid crystal display panel and the liquid crystal display device of the present invention can combine the second phase compensation film on the first phase compensation film to compensate the phase difference of the OCB type liquid crystal display panel, thereby ensuring the OCB type. Manufacturing and production of liquid crystal display devices.

In view of the above, the present invention has been disclosed in the above preferred embodiments, and is not intended to limit the invention, and the present invention may be made without departing from the spirit and scope of the invention. Various modifications and refinements are made, and the scope of the present invention is defined by the scope of the appended claims.

100‧‧‧LCD panel

101‧‧‧Backlight module

102‧‧‧Alignment to the grassroots

103‧‧‧Disc liquid crystal layer

110‧‧‧First polarizer

120, 180, 220, 280, 320, 380, 420, 480‧‧‧ second phase compensation film

130, 170, 230, 270, 330, 370, 430, 470‧‧‧ first phase compensation film

140‧‧‧First substrate

141‧‧‧Black matrix layer

142‧‧‧Common electrode layer

143‧‧‧First alignment layer

150‧‧‧Liquid layer

160‧‧‧second substrate

161‧‧‧pixel electrode layer

162‧‧‧Second alignment layer

190‧‧‧Second polarizer

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood. Schematic diagram of the panel.

2 is a cross-sectional view showing a liquid crystal display panel in accordance with a first embodiment of the present invention.

3 is a schematic diagram of a liquid crystal layer, a first phase compensation film, and a second phase compensation film according to a first embodiment of the present invention.

4 is a schematic view showing a liquid crystal layer, a first phase compensation film, and a second phase compensation film according to a second embodiment of the present invention.

5 is a schematic view showing a liquid crystal layer, a first phase compensation film, and a second phase compensation film according to a third embodiment of the present invention.

6 is a schematic view showing a liquid crystal layer, a first phase compensation film, and a second phase compensation film according to a fourth embodiment of the present invention.

130, 170‧‧‧First phase compensation film

120, 180‧‧‧Second phase compensation film

150‧‧‧Liquid layer

Claims (10)

A liquid crystal display panel comprising: a first substrate; a second substrate; a liquid crystal layer disposed between the first substrate and the second substrate, wherein the liquid crystal layer has a liquid crystal molecule arranged in a curved arrangement; The compensation films are respectively disposed on the same side or opposite sides of the liquid crystal layer, and each of the first phase compensation films comprises a discotic liquid crystal layer and an alignment base layer having dual optical axis characteristics, wherein the alignment base layer has a first slow axis and a first fast axis perpendicular to the first slow axis, corresponding to a maximum in-plane refractive index of the first slow axis and a refractive index corresponding to the first fast axis Having a first in-plane refractive index difference; and two second phase compensation films disposed on at least one of the first phase compensation films, wherein each of the second phase compensation films has a second slow axis And a second fast axis perpendicular to the second slow axis, wherein a maximum in-plane refractive index corresponding to the second slow axis and a refractive index corresponding to the second fast axis have a second in-plane Refractive index difference, the second in-plane refractive index difference Substantially similar to the refractive index difference of the first face. The liquid crystal display panel of claim 1, wherein the alignment of the alignment base layer is aligned with a rubbing direction of the discotic liquid crystal layer. The liquid crystal display panel of claim 2, wherein the thickness and optical characteristics of each of the second phase compensation films are substantially the same as the thickness and optical characteristics of the alignment base layer. The liquid crystal display panel of claim 2, wherein the material of the second phase compensation film is cellulose triacetate (TAC). The liquid crystal display panel of claim 1, wherein the phase compensation films are respectively disposed on opposite sides of the liquid crystal layer, and the second phase compensation films are respectively disposed on each of the first phases. Compensate the outside of the film. The liquid crystal display panel of claim 5, wherein a direction of the first slow axis of the alignment base layer of each of the first phase compensation films is perpendicular to each of the second phase compensation films The direction of the two slow axes. The liquid crystal display panel of claim 5, wherein a direction of the first slow axis of the alignment base layer of each of the first phase compensation films and the second of each of the two phase compensation films There is an angle of 45 degrees between the directions of the slow axial directions. The liquid crystal display panel of claim 1, wherein the first phase compensation films are respectively located on opposite sides of the liquid crystal layer, and the second phase compensation films are located on the same side of the liquid crystal layer. The liquid crystal display panel of claim 1, wherein the first phase compensation film and the second phase compensation film are located on the same side of the liquid crystal layer, and the second phase compensation film is located in the liquid crystal display panel. Some of the first phase compensation films. A liquid crystal display device comprising: a backlight module; and a liquid crystal display panel comprising: a first substrate; a second substrate; a liquid crystal layer disposed between the first substrate and the second substrate, wherein the The liquid crystal layer has a liquid crystal molecule arranged in a curved arrangement; two first phase compensation films are respectively disposed on the same side or opposite sides of the liquid crystal layer, and each of the first phase compensation films comprises a disk-shaped liquid crystal layer and has a double An alignment base layer of optical axis characteristics, wherein the alignment base layer has a first slow axis and a first fast axis perpendicular to the first slow axis, corresponding to a maximum in-plane refractive index of the first slow axis Corresponding to a first in-plane refractive index difference between the refractive indices of the first fast axis; and two second phase compensation films disposed on at least one of the first phase compensation films, wherein each The second phase compensation film has a second slow axis and a second fast axis perpendicular to the second slow axis, corresponding to a maximum in-plane refractive index of the second slow axis and corresponding to the second Between the refractive indices of the slow axis Second in-plane index difference, a refractive index difference based on the refractive index difference substantially the same as the first surface of the second inner surface.