CN1363852A - LCD display with wide viewing angle - Google Patents

Abstract

A liquid crystal display with wide viewing angle, high contrast ratio and high response speed. The liquid crystal display comprises a first deflection device of an upper panel and a second deflection device of a lower panel, and when no voltage is applied to the upper panel and the lower panel, liquid crystal molecules adjacent to the first deflection device and the second deflection device are vertically arranged between the upper panel and the lower panel in an approximately pi-shaped mode. After voltage is applied, an approximately arc-shaped electric field is generated by the deflection devices, and the liquid crystal molecules are turned to be arranged in a direction parallel to the upper and lower panels under the influence of the arc-shaped electric field.

Description

LCD display with wide viewing angle

The present invention relates to a liquid crystal display (Liquid Crystal Display, LCD) with a wide viewing angle, and in particular to a liquid crystal display with a wide viewing angle (wide viewing angle) comprising a liquid crystal deflection device and a liquid crystal having a negative dielectric constant difference.

Due to the advantages of low radiation and small size, liquid crystal displays are widely used. However, when the user views the liquid crystal display from different angles, as the angle increases, the contrast ratio will decrease, resulting in a limitation of the viewing angle. How to increase the viewing angle of the liquid crystal display to improve the image quality of the liquid crystal display is one of the topics that the industry is working on today.

Please refer to FIG. 1 , which shows a cross-sectional view of the structure of a traditional liquid crystal display. A conventional liquid crystal display includes an upper panel 102 and a lower panel 104 . Above the upper panel 102 is an upper polarizer film (analyzer film) 106 , and below the lower panel 104 is a lower polarizer film (polarizer film) 108 . Wherein, the polarization directions of the upper polarizing film 106 and the lower polarizing film 108 are perpendicular to each other. In addition, the upper panel 102 includes a glass substrate 110 , and the glass substrate 110 is sequentially covered with a color filter 112 , a transparent electrode 114 and an alignment film 116 . The lower panel 104 includes a glass substrate 120 , a transparent electrode 122 and an alignment film 124 . A liquid crystal layer 118 is interposed between the upper panel 102 and the lower panel 104 . The liquid crystal layer 118 includes a plurality of liquid crystal molecules, such as liquid crystal molecules 118A. The alignment films 114 and 124 are used in a rubbing process to make the liquid crystal molecules of the liquid crystal layer 118 arranged thereon in a fixed manner.

When a voltage Va is applied between the transparent electrode 114 and the transparent electrode 122, the liquid crystal molecules of the liquid crystal layer 118 will change their states according to the magnitude of the applied voltage Va, that is, the alignment direction of the liquid crystal molecules will change with the The applied voltage Va changes. Different liquid crystal alignments will cause different directions of light polarization. In this way, when the light (not shown in the figure) passes through the upper polarizing film 106 through the lower polarizing film 108 through the liquid crystal layer 118 , different states of liquid crystal molecules will affect the amount of light passing through the upper polarizing film 106 . That is to say, the transmittance of light will vary with different states of liquid crystal molecules in the liquid crystal layer 118 . Therefore, by controlling the magnitude of the applied voltage, the liquid crystal display panel can be produced with different luminances such as bright, bright and gray scale.

In order to achieve a wide viewing angle, a liquid crystal display using an Optically Compensated Bend (hereinafter referred to as OCB) mode has been proposed. Please refer to FIG. 2 , which is a graph showing the relationship between the applied voltage Va and the light transmittance of the liquid crystal display using the OCB mode. When the applied voltage Va is 0, the light transmittance is T1; when the applied voltage Va is the critical voltage Vc, the light transmittance has a maximum value, which is T2. And when the applied voltage Va is V1, the light transmittance is the minimum value, which is zero.

In addition, the dielectric constant difference of the liquid crystal used in the OCB mode liquid crystal display is a positive value. Moreover, the liquid crystal used in the OCB mode liquid crystal display is horizontally aligned, that is, the alignment films 116 and 124 make the liquid crystal molecules align horizontally in the same direction. The polarization directions of the upper polarizing film 106 and the lower polarizing film 108 are perpendicular to each other.

Please refer to FIGS. 3A-3C , which are diagrams illustrating the arrangement of liquid crystal molecules in the liquid crystal layer 118 when the liquid crystal display using the OCB mode is applied with different voltages Va. 3A , 3B and 3C are schematic diagrams of the arrangement of liquid crystal molecules in the liquid crystal layer 118 when the applied voltage Va is 0, Vc and V1 respectively. The liquid crystal layer 118 includes a first liquid crystal layer region A, a second liquid crystal layer region B and a third liquid crystal layer region C. The liquid crystal molecules in the region A of the first liquid crystal layer are in contact with the alignment film 106, the liquid crystal molecules in the region B of the second liquid crystal layer are in contact with the alignment film 124, and the liquid crystal molecules in the region C of the third liquid crystal layer are interposed Between the first liquid crystal layer region A and the second liquid crystal layer region B.

In FIG. 3A, in the initial state when the applied voltage Va is 0, the angle between the liquid crystal molecules in the first liquid crystal layer region A and the second liquid crystal layer region B and the alignment films 116 and 124 is very small, about three to about eight degrees, and the liquid crystal molecules in the third liquid crystal layer region C are almost parallel to the alignment films 116 and 124. At this time, the liquid crystals are in splay alignment, and the liquid crystal molecules are aligned with the upper and lower polarizing films 106 and 108. There is an angle so that light can pass through the upper and lower polarizing films 106, 108, so the liquid crystal display panel seen by the user is in a white state.

In FIG. 3B, when the applied voltage Va is Vc, the angle between the liquid crystal molecules in the first liquid crystal layer region A and the second liquid crystal layer region B and the alignment films 116 and 124 increases, and only part of the third liquid crystal layer The liquid crystal molecules in the region C are almost perpendicular to the alignment films 116 and 124 . At this time, the liquid crystal molecules are in a bend alignment, and the liquid crystal display panel seen by the user is still in a bright state with maximum brightness.

In FIG. 3C , when the applied voltage Va is V1, the angle between the liquid crystal molecules in the first liquid crystal layer region A and the third liquid crystal layer region C and the alignment films 116 and 124 is larger, up to 80 degrees or greater. . And most of the liquid crystal molecules in the region C of the third liquid crystal layer are almost perpendicular to the alignment films 116 and 124, that is to say, the polarization directions of the liquid crystal molecules and the upper and lower polarizing films 106 and 108 are almost perpendicular. When the LCD panel is in a dark state (dark state).

When the applied voltage Va between the upper and lower panels is greater than the critical voltage Vc and less than the voltage V1, it belongs to the operation area of the OCB mode liquid crystal display. By changing the magnitude of the applied voltage Va, the liquid crystal display panel can display gray scale changes with different light and dark brightness. Because the liquid crystal molecules turn in the same direction in the OCB mode, the friction between the liquid crystal molecules during rotation can be reduced, and the liquid crystal molecules are arranged neatly, so the liquid crystal display in the OCB mode has the advantages of high response speed (fast response) and wide viewing angle. However, the disadvantage of the OCB mode LCD is that the interval between the applied voltage Va between 0 and the critical voltage Vc is an unused and unstable buffer zone. To make the liquid crystal display in the OCB mode enter the operating range, the applied voltage Va must be greater than the critical voltage Vc. In this way, the required applied voltage Va will be increased, and the time required for the operation will be prolonged.

In view of this, the object of the present invention is to provide a liquid crystal display with a wide viewing angle. It is in a dark state in the initial state, and it is in a bright state after applying a voltage, so that the contrast ratio (contrastratio) can be improved. The present invention forms multiple display domains by forming opposite protrusions on the electrodes of the upper and lower substrates, so as to achieve the advantages of wide viewing angle, high contrast ratio and high response speed.

In order to realize the purpose of the present invention, a liquid crystal display with a wide viewing angle is proposed, which includes a first substrate, a first electrode, a first deflection device, a second substrate, a pixel electrode, a second deflection device, and a liquid crystal layer. The first substrate has a first surface, the first electrode and the first deflection device are located on the first surface, and the first deflection device has a first slope. The second substrate has a second surface, the second surface is opposite to the first surface, and the pixel electrode and the second deflection device are located on the second surface. The second deflection device corresponds to the first deflection device, and the second deflection device has a second slope. The liquid crystal layer is filled between the first substrate and the second substrate, and the liquid crystal layer is composed of a plurality of liquid crystal molecules with different anisotropic negative dielectric constants, and includes first liquid crystal molecules adjacent to the first deflection device, adjacent to the second deflection device a second liquid crystal molecule, and a third liquid crystal molecule not adjacent to the first deflection device or the second deflection device. When no driving voltage is applied between the first electrode and the pixel electrode, then (a) the first liquid crystal molecules are arranged in a direction perpendicular to the first slope, and form a first angle with the first substrate, and the first angle is Acute angle; (b) The second liquid crystal molecules are arranged in a direction perpendicular to the second slope, and there is a second angle with the first substrate, and the second angle is an obtuse angle; (c) The third liquid crystal molecules are arranged perpendicular to the first substrate The direction is arranged so that the first liquid crystal molecules, the third liquid crystal molecules, and the second liquid crystal molecules are vertically arranged between the first substrate and the second substrate sequentially in an approximately π-shaped manner. When a driving voltage is applied between the first electrode and the pixel electrode, the first deflection device and the second deflection device generate an approximately arc-shaped driving electric field between the first substrate and the second substrate, so that the first liquid crystal molecules The first direction is rotated, and the second liquid crystal molecules are rotated in a second direction. The first direction is different from the second direction, so the driving electric field causes the first liquid crystal molecules, the second liquid crystal molecules, and the third liquid crystal molecules to be arranged in a direction approximately parallel to the first substrate.

In addition, when the driving voltage is not applied between the first electrode and the pixel electrode, the liquid crystal display is in a dark state (dark state); when the driving voltage applied between the first electrode and the pixel electrode is a specific voltage , the liquid crystal display is in a white state.

Furthermore, the upper panel and the lower panel include a plurality of pixel areas, and each pixel area is divided into a plurality of display areas (domains) by the first device and the second device.

In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is specifically cited below and described in detail with accompanying drawings. In the attached picture:

FIG. 1 shows a cross-sectional view of the structure of a conventional liquid crystal display.

FIG. 2 is a graph showing the relationship between the applied voltage Va and the light transmittance of the liquid crystal display using the OCB mode in the prior art.

3A to 3C are schematic diagrams illustrating the arrangement of liquid crystal molecules in the liquid crystal layer when the liquid crystal display using the OCB mode is applied at different voltages Va.

FIG. 4 is a cross-sectional view of the structure of the liquid crystal display in the first embodiment of the present invention.

FIG. 5 is a graph showing the relationship between the applied driving voltage Va and the light transmittance of the liquid crystal display according to the present invention.

FIG. 6 is a cross-sectional view of the structure of the liquid crystal display when a specific voltage Vx is applied between two electrodes in FIG. 4 .

FIG. 7 is a schematic diagram illustrating the relationship between liquid crystal molecules and incident light in FIG. 6 .

8A-8D are top schematic diagrams showing the formation method of protrusions and the tilting directions of liquid crystal molecules in a pixel region of a liquid crystal display according to the present invention.

9A-9B are cross-sectional views of the structure of the liquid crystal display in the second embodiment of the present invention.

10A-10B are cross-sectional views of the structure of the liquid crystal display in the third embodiment of the present invention.

11A-11B are cross-sectional views of the structure of the liquid crystal display in the fourth embodiment of the present invention.

FIG. 12 is a cross-sectional view of the structure of the liquid crystal display in the fifth embodiment of the present invention.

FIG. 13 is a cross-sectional view of the structure of the liquid crystal display in the sixth embodiment of the present invention.

FIG. 14 is a cross-sectional view of the structure of the liquid crystal display in the seventh embodiment of the present invention.

Explanation of reference numbers:

102, 402, 902, 1002, 1120, 1202, 1302, 1402: upper panel

104, 404, 1004, 1104, 1204, 1304: lower panel

106, 406: upper polarizing film

108, 408: lower polarizing film

110, 120: glass substrate

410: first substrate

420: second substrate

112, 412: color filter

114, 122: transparent electrodes

4142, 914, 1014, 1114, 1214, 1314, 1414: first electrode

422, 1022, 1122, 1222, 1322, 1422: pixel electrodes

416, 426, 1016, 1026, 1116, 1126, 1216, 1226: protrusions

116, 124: alignment film

118, 428: liquid crystal layer

118A, 428A'1, 428A'2, 428B'1, 428B'2, 428C'1, 428C'2: liquid crystal molecules

418, 424, 918, 1018, 1024, 1118, 1124, 1218, 1224, 1318, 1324, 1418, 1424: vertical alignment film

1416, 1426: dielectric layer

The present invention has both the advantages of a vertical alignment (Vertical alignment) liquid crystal display and an optically compensated bend (hereinafter referred to as OCB) mode liquid crystal display. The technical feature of the present invention is that, as long as the electric field generated in the liquid crystal layer is laterally bent when a voltage is applied between the electrodes of the upper panel and the lower panel, a liquid crystal with a vertical alignment and a negative value of the dielectric constant difference can be matched. Molecules can achieve the liquid crystal display with wide viewing angle, high contrast ratio and high response speed of the present invention. The liquid crystal display of the present invention includes a first deflection device in the upper panel and a second deflection device in the lower panel, which are used to generate an arc-shaped deflection electric field in the liquid crystal layer. The first device and the second device can be realized by a bump made of a dielectric material, or a slit formed in the transparent electrode.

First embodiment:

Please refer to FIG. 4 , which shows a cross-sectional view of the structure of the liquid crystal display according to the first embodiment of the present invention. The liquid crystal display includes an upper panel 402 and a lower panel 404 . Above the top panel 402 is an analyzer film 406 , and below the bottom panel 404 is a polarizer film 408 . Wherein, the polarization directions of the upper polarizing film 406 and the lower polarizing film 408 are perpendicular to each other. The upper panel 402 includes a first substrate 410 , and the lower panel 404 includes a second substrate 420 . The first substrate 410 includes a first surface 4101 , the second substrate 420 includes a second surface 4201 , and the first surface 4101 is opposite to the second surface 4201 . In addition, a color filter 412, a first electrode 414, and a first deflection device 416 are sequentially disposed on the first substrate 410. In order to achieve the purpose of the present invention, the first deflection device is a protrusion 416 disposed on the first electrode 414, and the material of the protrusion 416 is a dielectric material with a low dielectric constant. Then, a vertical alignment film (vertical alignment film) 418 covers the protrusions 416 and the first electrodes 414 .

The lower panel 404 further includes a pixel electrode 422 and a second deflection device 426 formed on the second surface 4201 of the second substrate 420 . In this embodiment, the second deflection device is a protrusion 426 disposed on the pixel electrode 422 . The vertical alignment film 424 covers the protrusion 426 and the pixel electrode 422 . A liquid crystal layer 428 is interposed between the upper panel 402 and the lower panel 404 . As shown in FIG. 4 , the protrusion 416 is located on the first surface 4101 and has at least one slope 4161 . The protrusion 426 is located on the second surface 4201 and has at least one slope 4261 . In addition, the protrusions 426 of the second substrate correspond to the positions of the protrusions 416 of the first substrate.

The liquid crystal layer 428 is composed of a plurality of liquid crystal molecules with anisotropic negative dielectric constant, and includes a first liquid crystal layer region A', a second liquid crystal layer region B' and a third liquid crystal layer region C'. The first liquid crystal layer region A' includes a plurality of first liquid crystal molecules, such as liquid crystal molecules 428A'1 and 428A'2, which are in contact with the vertical alignment film 418 and adjacent to the protrusions 416 of the first deflection device. The second liquid crystal layer area B' also includes a plurality of second liquid crystal molecules, such as liquid crystal molecules 428B'1 and 428B'2, and these liquid crystal molecules are in contact with the vertical alignment film 424 and adjacent to the protrusions of the second deflection device. 426. A plurality of third liquid crystal molecules in the third liquid crystal layer region C' are sandwiched between the first liquid crystal layer region A' and the second liquid crystal layer region B', and are not adjacent to the first deflection device 416 or the second deflection device 416. Device 426.

When no driving voltage is applied between the first electrode 410 and the pixel electrode 420, the first liquid crystal molecules 428A′1 are arranged in a direction perpendicular to the first slope 4161, and form a first angle _θ1 with the first substrate 410 , and the first angle θ ₁ is an acute angle. At the same time, the second liquid crystal molecules 428B'1 are arranged in a direction perpendicular to the second slope 4261, and form a second angle θ ₂ with the first substrate 410, and the second angle θ ₂ is an obtuse angle. The third liquid crystal molecules 428C'1 are arranged in a direction perpendicular to the first substrate 410, so that the first liquid crystal molecules 428A'1, the third liquid crystal molecules 428C'1, and the second liquid crystal molecules 428B'1 are arranged in an approximately π-shaped manner. Vertically arranged between the first substrate 410 and the second substrate 420 .

For the purpose of the present invention, the dielectric constant difference of the liquid crystal molecules in the liquid crystal layer 428 is a negative value, that is, the dielectric constant in the direction parallel to the long axis of the liquid crystal molecules is smaller than the dielectric constant in the direction perpendicular to the long axis of the liquid crystal molecules . In order to make the effect of the present invention more remarkable, the preferred implementation mode is that the difference between the dielectric constant of the liquid crystal molecules and the dielectric constant of the protrusions 416 and 426 is as large as possible, and the protrusions 416 and 426 have a smaller dielectric constant. Dielectric material is preferred.

At this time, because most of the liquid crystal molecules are vertically aligned and perpendicular to the upper and lower polarizing films 406 and 408, when the driving voltage is not applied, light (not shown in the figure) cannot penetrate the upper polarizing film 406 or the lower polarizing film. film 408, so that the liquid crystal display panel presents a dark state (dark state).

Please refer to FIG. 5 , which shows the relationship between the applied voltage Va and the light transmittance of the liquid crystal display according to the present invention. When the voltage Va applied between the first electrodes 414 and 422 is 0, the liquid crystal display panel is in a dark state, that is, the light transmittance is 0. When the voltage Va applied between the transparent electrodes 414 and 422 is a specific voltage Vx, the light transmittance is the maximum, which is T3. It can be seen from FIG. 5 that when the applied voltage Va increases, the light transmittance increases accordingly. Therefore, by properly controlling the value of the applied voltage Va, the purpose of light and dark and grayscale imaging can be achieved.

Please refer to FIG. 6 , which shows a cross-sectional view of the structure of the liquid crystal display when a specific voltage Vx is applied between the first electrode and the pixel electrode in FIG. 4 .

When a specific voltage Vx is applied between the first electrode 414 and the pixel electrode 422, the liquid crystal layer 428 will change its arrangement according to the applied voltage Vx. In FIG. 6, the dotted line shows the equipotential line of the electric field generated between the first electrode 414 and the pixel electrode 422 when a specific voltage Vx is applied between the first electrode 414 and the pixel electrode 422, and the arrows indicate Shown are the lines of force driving the electric field. Because the dielectric constant difference of the liquid crystal molecules is negative, the liquid crystal molecules in the third liquid crystal layer region C′ will be affected by the electric field and rotate so that the long axis of the liquid crystal molecules is perpendicular to the electric force line. In addition, for the liquid crystal molecules in the first liquid crystal layer region A', after being affected by the electric field, the liquid crystal molecules 428A'1 will rotate and make their long axes perpendicular to the lines of electric force. Since the liquid crystal molecules are in a closely connected structure, the rotated liquid crystal molecules 428A'1 will push the adjacent liquid crystal molecules, so that other liquid crystal molecules in the first liquid crystal layer area A', such as the liquid crystal molecules 428A'2, will be rotated to approximate the orientation of the liquid crystal molecules 428A'1. Similarly, it can be seen that all the liquid crystal molecules in the second liquid crystal layer region B′ will rotate to a direction similar to that of the liquid crystal molecules 428B′1, for example, the liquid crystal molecules 428B′2.

That is to say, when the driving voltage is applied between the first electrode 414 and the pixel electrode 422, the protrusion 416 of the first deflection device and the protrusion 426 of the second deflection device make a gap between the first substrate 410 and the second substrate 420. An approximately arc-shaped driving electric field 43 makes the first liquid crystal molecules 428A′ 1 rotate in the first direction 45 , and makes the second liquid crystal molecules 428B′ 1 rotate in the second direction 49 . The first direction 45 is opposite to the second direction 49, so the driving electric field 43 causes the first liquid crystal molecules 428A'1, the second liquid crystal molecules 428B'1, and the third liquid crystal molecules 428C'1 to turn approximately parallel to the first substrate 410. arranged in the direction.

At this time, because most of the liquid crystal molecules are parallel to the first electrode 414 and the pixel electrode 422, and form an angle with the upper and lower polarizers 406, 408, therefore, after the driving voltage Vx is applied, they pass through the lower polarizer 408 The light (not shown in the figure) can also pass through the upper polarizing film 406, so that the liquid crystal display panel shows a white state (white state).

Comparing the present invention with the prior art, please refer to FIG. 3C and FIG. 4 at the same time. The arrangement of liquid crystal molecules in FIG. 4 is similar to the arrangement of liquid crystal molecules in FIG. Between, is the dark state of the liquid crystal display panel (dark state). Referring again to FIG. 3A and FIG. 6 , the arrangement of the liquid crystal molecules in FIG. 6 is similar to the arrangement of the liquid crystal molecules in FIG. 3A , both of which have long axes of the liquid crystal molecules parallel to the transparent electrodes. Wherein, Fig. 3C and Fig. 4 are respectively the situation of applying voltage and not applying voltage to the liquid crystal display, and Fig. 3A and Fig. 6 are respectively not applying the situation of voltage and applying voltage to the liquid crystal display, represent the operation situation of the present invention and traditional light The liquid crystal display in the optically compensated bend (OCB) mode is opposite, so the present invention can be regarded as a liquid crystal display in the reverse OCB mode (reverse OCB).

Please refer to FIG. 7 , which shows a schematic diagram of the liquid crystal molecules and incident light shown in FIG. 6 . Since the arrangement of liquid crystal molecules in the liquid crystal region A' of the first layer is symmetrical to the arrangement of liquid crystal molecules in the liquid crystal region B' of the second layer, when light L1 and light L2 respectively pass through the liquid crystal layer 428, the liquid crystal molecules are aligned The effects produced by the light L1 and the light L2 are the same. Therefore, the brightness of the picture seen by the user from the right side of the liquid crystal display panel will be the same as the brightness of the picture seen from the left side. In this way, the advantage of wide viewing angle can be achieved by using the liquid crystal display of the present invention.

On the other hand, when the liquid crystal molecules are converted from the arrangement shown in Figure 4 to the arrangement shown in Figure 6 after applying a voltage, during the rotation of the liquid crystal molecules, the rotation between the upper and lower liquid crystals The directions are opposite, one is up and the other is down, and one is clockwise and the other is counterclockwise. In this way, the frictional force between the liquid crystal molecules is very small, so the effect of quick response can be produced. In contrast, when the liquid crystal display of the prior art operates, whether it is a twisted linear mode (Twisted Nematic mode, TN) or a vertical alignment mode (Vertical alignment mode, VA), the rotation mode of the liquid crystal is in the same direction, which is clockwise. Or both are counterclockwise, the friction between the upper and lower liquid crystal molecules is greater, and the response time of the liquid crystal action is longer. In addition, if the difference between the dielectric constants of the protrusions 416 and 426 and the difference between the dielectric constants of the liquid crystal molecules increases, it can be seen from FIG. The force guiding the rotation of liquid crystal molecules is strengthened, which makes the reaction speed faster.

Please refer to FIGS. 8A-8D , which are schematic top views showing the formation of protrusions and the tilting directions of liquid crystal molecules in a pixel region of a liquid crystal display according to the present invention. The pixel area refers to the pixel electrode corresponding to the space between the first and second substrates 410 , 420 . Please refer to FIG. 4 at the same time, the upper panel 402 and the lower panel 404 extend on the XY plane and include a plurality of pixel areas. As shown in FIGS. 8A-8D , in each pixel area, the protrusions 416 and 426 of the first and second deflection devices divide each pixel area into a plurality of display domains. In this way, after the voltage is applied, the tilting directions of the liquid crystal molecules in different regions of the pixel area are different, and different tilting directions of the liquid crystal molecules determine different display domains. 8A, 8B, and 8D show a liquid crystal display with 2 display domains, and FIG. 8C shows a liquid crystal display with 4 display domains. By changing the display domain or increasing the number of display domains, a liquid crystal display with a wide viewing angle can be effectively achieved.

As shown in FIGS. 8A-8D , the direction AA represents the polarization direction of the upper polarizing film 406 , and the direction PP represents the polarization direction of the lower polarizing film 408 . The polarization directions of the upper and lower polarizing films 406 and 408 can also be opposite to each other. The protrusions in FIG. 8A are formed along the diagonal of a pixel area, the protrusions in FIG. 8B are formed in a double L shape, the protrusions in FIG. 8C are formed in a cross shape, and the protrusions in FIG. 8D are formed in an H shape. However, the implementation of the present invention is not limited thereto, as long as the formation of protrusions that can form multiple different display domains is within the scope of the present invention.

In FIG. 4 and FIG. 6, the protrusions 416 and 426 are taken as examples for illustration. However, when implementing the present invention, as long as the arc-shaped bias electric field that can be generated after applying a voltage to the first electrode 414 and the pixel electrode 422 is sufficient. . Second embodiment:

Please refer to FIGS. 9A-9B , which illustrate a cross-sectional view of the structure of the liquid crystal display in the second embodiment of the present invention. In FIGS. 9A to 9B , the parts having the same structure as those in FIG. 4 are denoted by the same reference numerals. 9A and 9B are cross-sectional views when no driving voltage is applied and when the driving voltage is applied, respectively. An opening 915 is formed in the first electrode 914 on the upper panel 902 and covered with a vertical alignment film 918 . The structure of the lower panel 404 is the same as that of the first embodiment shown in FIG. 4 . It can be known from FIG. 9B that after the voltage is applied to the transparent electrodes 914 and 422 , the lines of force are bent due to the influence of the protrusion 426 and the corresponding opening 1915 , so that the object of the present invention can be achieved. Third embodiment:

Please refer to FIGS. 10A-10B , which are schematic cross-sectional views of the structure of the liquid crystal display in the third embodiment of the present invention. In FIGS. 10A-10B , the parts with the same structure as in FIG. 4 are denoted by the same reference numerals. 10A and 10B are cross-sectional views when no driving voltage is applied and when a driving voltage is applied, respectively. In the upper panel 1002, a protrusion 1016 is formed on the color filter 412, and a first electrode 1014 is formed thereon. Next, the vertical alignment film 1018 covers the first electrode 1014 . In the lower panel 1004, the protrusions 1026 corresponding to the protrusions 1016 are firstly formed on the second substrate 420, and a pixel electrode 1022 is also formed thereon. Then the vertical alignment film 1024 covers the pixel electrodes 1022 . In the first embodiment, the protrusions are located above the electrodes, but the third embodiment differs from the first embodiment in that the protrusions 1016 and 1026 as the first and second deflection means are respectively located below the first electrode 1014 and the pixel electrode 1022 . From Figure 10B, it can be seen that after the voltage is applied, the force line will bend due to the influence of the protrusions 1016 and 1026 , so that the object of the present invention can be achieved. Fourth embodiment:

Please refer to FIGS. 11A-11B , which are cross-sectional views of the structure of the liquid crystal display device in the fourth embodiment of the present invention. In FIGS. 11A-11B , the parts with the same structure as in FIG. 4 are denoted by the same reference numerals. 11A and 11B are cross-sectional views when no driving voltage is applied and when the driving voltage is applied, respectively. In the upper panel 1102 , a protrusion 1116 is formed on the color filter 412 and covered with the first electrode 1114 . Next, the vertical alignment film 1118 covers the first electrode 1114 . In the lower panel 1104 , protrusions 1126 corresponding to the protrusions 1116 are formed on the pixel electrode plate 1122 and covered with a vertical alignment film 1124 . The difference between the fourth embodiment and the first and third embodiments is that the protrusion 1116 as the first deflection device is located below the first electrode 1014 , and the protrusion 1126 as the second deflection device is located above the pixel electrode 1022 . It can be seen from FIG. 11B that after the voltage is applied, the influence of the protrusions 1116 and 1126 will cause the electric force line to bend, so as to achieve the purpose of the present invention. Fifth embodiment:

Please refer to FIG. 12 , which shows a cross-sectional view of the structure of the liquid crystal display in the fourth embodiment of the present invention. In FIG. 12 , the parts with the same structure as in FIG. 4 are denoted by the same reference numerals. Wherein, FIG. 12 is a schematic diagram when no voltage is applied. A protrusion 1216 is formed on the first electrode 1214 of the upper panel 1202 and covered with a vertical alignment film 1218 . In the lower panel 1204 , the protrusion 1226 is formed on the pixel electrode 1222 and covered with the vertical alignment film 1224 . Wherein, the positions of the protrusions 1216 and 1226 are corresponding, and the protrusions 1226 are located below the protrusions 1216 . In addition, the protrusion 1216 as the first deflection device has two slopes 1217, 1219, and the slopes of the two slopes are different. Similarly, the protrusion 1226 as the second deflection device also has two slopes with different slopes. In this way, different display domains can be obtained by using different heights of the protrusions 1216 and 1226 and slopes of slopes on both sides, so that the liquid crystal molecules on the two sides have different tilt directions. Sixth embodiment:

FIG. 13 is a cross-sectional view of the structure of the liquid crystal display in the fifth embodiment of the present invention. In FIG. 13 , the parts with the same structure as those in FIG. 4 are denoted by the same reference numerals. FIG. 13 is a schematic diagram when no driving voltage is applied. In FIG. 13 , after forming corresponding openings on the first electrode 1314 and the pixel electrode 1322 respectively, the vertical alignment films 1318 and 1324 are covered. In this way, after the voltage is applied, due to the influence of the openings of the first electrode 1314 and the pixel electrode 1322 , the electric force line will appear bent, so as to achieve the purpose of the present invention. Seventh embodiment:

FIG. 14 is a cross-sectional view of the structure of the liquid crystal display in the sixth embodiment of the present invention. In FIG. 14, the same components as those in FIG. 4 are denoted by the same reference numerals. Fig. 14 is a cross-sectional view when no driving voltage is applied. In FIG. 14, instead of the protrusions, a dielectric layer 1416 and 1426 with corresponding grooves may be used. They are respectively interposed between the first electrode 1414 and the vertical alignment film 1418 , and between the pixel electrode 1422 and the vertical alignment film 1424 . After voltage is applied, the dielectric layers 1416 and 1426 of the groove can make the electric force line bend, which can also achieve the purpose of the present invention.

The liquid crystal display with a wide viewing angle disclosed in the above-mentioned embodiments of the present invention combines the advantages of a liquid crystal display using a vertically aligned liquid crystal and an OCB mode liquid crystal display, including: wide viewing angle, fast response, high contrast ratio, and high contrast ratio when no voltage is applied. Produces a perfect dark state.

In summary, although the present invention has been disclosed above in conjunction with a preferred embodiment, it is not intended to limit the present invention. Those skilled in the art can make various modifications and changes without departing from the spirit and scope of the present invention. modification, so the protection scope of the present invention should be defined by the appended claims.

Claims (15)

1. the LCD of a wide viewing angle comprises:

One first substrate has a first surface on it;

One first electrode and one first deviator are positioned on this first surface, and this first deviator has one first inclined-plane;

One second substrate has a second surface on it, this second surface is relative with this first surface;

One pixel electrode and one second deviator are positioned on this second surface of this second substrate, and this second deviator has one second inclined-plane, and this second deviator is corresponding with this first deviator; And

One liquid crystal layer, be filled between this first substrate and this second substrate, this liquid crystal layer is made up of the liquid crystal molecule of a plurality of anisotropy negative permittivities, this liquid crystal layer comprises one first liquid crystal molecule in abutting connection with this first deviator, in abutting connection with one second liquid crystal molecule of this second deviator, and not in abutting connection with one the 3rd liquid crystal molecule of this first deviator or this second deviator;

When not applying a driving voltage between this first electrode and this pixel electrode, (a) this first liquid crystal molecule is arranged with the direction perpendicular to this first inclined-plane, and accompanies one first angle with this first substrate, and this first angle is an acute angle; (b) this second liquid crystal molecule is arranged with the direction perpendicular to this second inclined-plane, and accompany one second angle with this first substrate, and this second angle is the obtuse angle, (c) the 3rd liquid crystal molecule is arranged with the direction perpendicular to this first substrate, make this first liquid crystal molecule, the 3rd liquid crystal molecule, this second liquid crystal molecule is vertically arranged between this first substrate and this second substrate in regular turn in approximate π shape mode;

When applying this driving voltage between this first electrode and this pixel electrode the time, this first deviator and this second deviator make and produce an approximate circle arc driving electric field between first substrate and second substrate, and this first liquid crystal molecule is rotated according to a first direction, this second liquid crystal molecule is rotated according to a second direction.And this first direction is opposite with this second direction direction, and so this driving electric field makes this first liquid crystal molecule, this second liquid crystal molecule, the 3rd liquid crystal molecule all turn to the direction of approximate parallel this first substrate to arrange.

2. LCD as claimed in claim 1, wherein, this first deviator is one first thrust (bump), this second deviator is one second thrust, this first thrust is formed on this first electrode, and this second thrust is formed on this pixel electrode, and this second deviator be positioned at this first deviator under.

3. LCD as claimed in claim 2, wherein, the material of this first thrust and this second thrust is the dielectric medium of low-k.

4. LCD as claimed in claim 2, wherein, this first thrust also has one the 3rd inclined-plane, the slope on the slope on the 3rd inclined-plane and this first inclined-plane is inequality, and this second thrust also has one the 4th inclined-plane, and the slope on the slope on the 4th inclined-plane and the 3rd inclined-plane is inequality.

5. LCD as claimed in claim 1, wherein, this first deviator is one first thrust, this second deviator is one second thrust, this first thrust is formed on this first substrate, and this first electrode covers this first thrust, and this second thrust is formed on this pixel electrode, wherein, the material of this first thrust and this second thrust is the dielectric of low-k.

6. LCD as claimed in claim 1, wherein, this first deviator is one first thrust, this second deviator is one second thrust, and this first thrust is formed on this first substrate, and this first electrode covers this first thrust, this second thrust is formed on this second substrate, and this second pixel electrode covers this second thrust, and wherein, the material of this first thrust and this second thrust is the dielectric medium of low-k.

7. LCD as claimed in claim 1, wherein, also comprise one first dielectric layer on this first substrate, also comprise one second dielectric layer on this second substrate, this first deviator is one first groove, this first groove is located in this first dielectric layer, this second deviator is one second groove, this second groove is located in this second dielectric layer, this second groove is positioned under this first groove, and this first dielectric layer is formed on this first electrode, and this second dielectric layer is formed on this pixel electrode.

8. LCD as claimed in claim 1, wherein, this pixel electrode corresponding to this first and this second substrate between definition space be a pixel region, and this first deviator and this second deviator are divided into a plurality of viewing areas (domain) with this pixel region.

9. LCD as claimed in claim 8, wherein this first deviator and this second deviator form along the diagonal line of this pixel region.

10. LCD as claimed in claim 8, wherein first deviator of this in this pixel region becomes L shaped with the shape of this second deviator.

11. LCD as claimed in claim 8, wherein in this pixel region, this first deviator and this second deviator form cruciform.

12. LCD as claimed in claim 8, wherein in this pixel region, this first deviator and this second deviator form H shape.

13. the LCD of a wide viewing angle comprises:

One first substrate, has a first surface on it;

One first electrode and one first deviator are positioned on this first surface;

One second substrate has a second surface on it, this second surface is relative with this first surface;

One pixel electrode and one second deviator are positioned on this second surface of this second substrate, and this second deviator is corresponding with this first deviator; And

One liquid crystal layer, be filled between this first substrate and this second substrate, this liquid crystal layer is by the molecular composition of a plurality of negative permittivity anisotropic liquid crystal, this liquid crystal layer comprises one first liquid crystal molecule in abutting connection with this first deviator, in abutting connection with one second liquid crystal molecule of this second deviator, and not in abutting connection with one the 3rd liquid crystal molecule of this first deviator or this second deviator;

When not applying a driving voltage between this first electrode and this pixel electrode, (a) this first liquid crystal molecule is arranged with the direction perpendicular to this first deviator, and accompany a third angle degree with this first substrate, (b) this second liquid crystal molecule is arranged with the direction perpendicular to this second deviator, and accompany one the 4th angle with this first substrate, and the 4th angle is the obtuse angle, (c) the 3rd liquid crystal molecule to be to arrange perpendicular to the direction of this first substrate, makes this first liquid crystal molecule, the 3rd liquid crystal molecule, this second liquid crystal molecule is vertically arranged between this first substrate and this second substrate in regular turn in approximate π shape mode;

When applying this driving voltage between this first electrode and this pixel electrode the time, this first deviator and this second deviator make and produce an approximate circle arc driving electric field between first substrate and second substrate, and this first liquid crystal molecule is rotated according to a first direction, the 3rd liquid crystal molecule is rotated according to a second direction, and this first direction is different with this second direction direction, and so this driving electric field makes this first liquid crystal molecule, this second liquid crystal molecule, the 3rd liquid crystal molecule all turn to the direction of approximate parallel this first substrate to arrange.

14. LCD as claimed in claim 13, wherein, this first deviator is one first opening (slit), this first opening is located on this first electrode, this second deviator is one the 3rd thrust, this second thrust is formed on this pixel electrode, and wherein, the material of the 3rd thrust is the dielectric of low-k.

15. LCD as claimed in claim 13, wherein, this first deviator is one first opening, and this second deviator is one second opening, and this first opening is formed on this first electrode, and this second opening is formed on this pixel electrode.

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