TWI402581B - Liguid crystal display - Google Patents

Description

LCD Monitor

The present invention relates to a liquid crystal display (LCD), and more particularly to a ferroelectric type liquid crystal display.

Currently, ferroelectric liquid crystals are used in Color Sequential Display because of their fast response characteristics. Since the ferroelectric liquid crystal is a kind of smectic liquid crystal (Smectic), and the viscous coefficient of the smectic liquid crystal is relatively high, in order to smoothly inject the liquid crystal between the two substrates, and considering the uniform distribution requirement of the liquid crystal, the panel or The LCD will warm up and then cool the panel for easy liquid injection.

However, in the process of injecting the ferroelectric liquid crystal, since the viscosity coefficient of the liquid crystal is relatively high, when the cooling process is performed, the fluidity of the liquid crystal is lowered, and the solidification is further performed. The color-added display has no color filter, so the image of the conventional color-sequential display will show uneven color (Mura).

In addition, it has been found that the thermal expansion coefficient of ferroelectric liquid crystals is much higher than that of glass substrates. Therefore, when heated and cooled, the volume shrinkage of liquid crystals will cause adhesion stress on the surface of liquid crystal and polyimide (PI). A zigzag defect (Zig-Zag) is caused, so that the liquid crystal finds a directional defect.

Therefore, the current patent has a straight strip wall structure (US5559621) to improve this phenomenon, but when the liquid crystal flows, when the flow direction is different from the alignment direction, a zigzag defect (Zig-Zag) is generated, so that the liquid crystal occurs. Orientation defects. The longer the liquid crystal flow path, the more serious the defect. Even if it is heated again to the isotropic liquid crystal phase, this defect still exists, which cannot be solved by the straight strip wall structure.

The present invention provides a liquid crystal display to reduce the probability of occurrence of zigzag defects.

The invention proposes a liquid crystal display. The liquid crystal display includes a first substrate, a second substrate, a mesh spacer, and a liquid crystal. The first substrate includes a black matrix. The mesh spacer is composed of a plurality of longitudinal partition strips and a plurality of lateral partition strips, and is disposed between the first substrate and the second substrate and disposed on the black matrix, wherein the longitudinal partition strips and the lateral partition strips The thickness of the two is different. The liquid crystal is disposed in a space formed by the first substrate, the second substrate, and the mesh spacer.

In an embodiment of the invention, the thickness of both the longitudinal dividing strip and the lateral dividing strip is between 0.1 and 20 microns.

In an embodiment of the invention, the longitudinal dividing strip has a first top surface, the horizontal dividing strips have a second top surface, and the first top surface and the second top surface are not coplanar.

In an embodiment of the invention, the mesh spacer includes a plurality of grooves, and a bottom surface of the grooves faces the second substrate.

In an embodiment of the invention, the material of the mesh spacer is a thermosetting material or an ultraviolet curing material.

In an embodiment of the invention, the material of the mesh spacer is an acrylic resin.

In an embodiment of the invention, the mesh spacer further comprises a plurality of first protrusions disposed on one side of the mesh spacer, the first protrusion being semi-circular, trapezoidal or a cone shape.

In an embodiment of the invention, wherein the mesh spacer further comprises a plurality of second protrusions, the second protrusions are located opposite to the first protrusions.

In an embodiment of the invention, the mesh spacer strip has a top surface and a bottom surface, and the width of the top surface is greater than the width of the bottom surface.

In an embodiment of the invention, wherein the width of the mesh spacer is smaller than the width of the black matrix.

In an embodiment of the invention, the liquid crystal is a ferroelectric liquid crystal.

In an embodiment of the invention, the first substrate and the second substrate are composed of a transparent conductive material.

In an embodiment of the invention, the transparent conductive material is an indium tin oxide or an indium zinc oxide.

As described above, in the liquid crystal display of the present invention, the structural design of the mesh spacer disposed on the black matrix layer is different in the horizontal and vertical directions. Therefore, the mesh spacer having a high or low drop or a concave structure or a convex structure design can uniformly flow the liquid crystal during the filling of the liquid crystal to increase the uniformity of the liquid crystal filling. Therefore, the liquid crystal display of the present invention can be applied to a display.

The above described features and advantages of the present invention will be more apparent from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a side elevational view of a liquid crystal display device in accordance with an embodiment of the present invention. 2 is a perspective view showing the configuration of a mesh spacer according to an embodiment of the present invention. Figure 3 is a side elevational view of a mesh spacer in accordance with one embodiment of the present invention. Referring to FIG. 1 , FIG. 2 and FIG. 3 , the liquid crystal display 1 includes a first substrate 10 , a second substrate 20 , a mesh spacer 30 , and a liquid crystal (not shown).

Liquid crystals (not shown) are disposed in the spaces formed by the first substrate 10, the second substrate 20, and the mesh spacers 30. The liquid crystal is a ferroelectric liquid crystal.

The first substrate 10 includes a black matrix 12 and a transparent conductive substrate 11. The transparent conductive substrate 11 is composed of a transparent conductive material, and the material thereof is, for example, Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO).

The second substrate 20 also includes a transparent conductive substrate, and the transparent conductive substrate is composed of a transparent conductive material, and the material thereof is, for example, Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO). ).

The mesh spacer 30 is disposed between the first substrate 10 and the second substrate 20 and disposed on the black matrix 12 of the first substrate. As such, the mesh spacers 30 can be utilized to define the spacing between the first substrate and the second substrate. Then, a liquid crystal injection process is performed, whereby the basic structure of the liquid crystal display shown in Fig. 1 is formed.

a process in which the liquid crystal is filled in the space formed by the first substrate 10, the second substrate 20, and the mesh spacer 30, which can be printed by conventional printing techniques such as inkjet, gravure, screen printing, spray printing, or It is done by strip coating or the like.

2 is a perspective view showing the arrangement of the mesh spacers 30 according to an embodiment of the present invention. Referring to FIG. 2, the mesh spacer 30 is composed of a plurality of longitudinal partition strips 31 and a plurality of lateral partition strips 32, wherein it should be particularly noted that the configuration of the longitudinal partition strips 31 and the lateral partitions 32 has a height difference. . Preferably, the thickness of both the longitudinal dividing strip 31 and the lateral dividing strip 32 differ by between 0.1 and 20 microns.

For example, as shown in FIG. 2, the longitudinal partition strip 31 has a first top surface 311, and the lateral partition strip 32 has a second top surface 321 wherein the first top surface 311 and the second top surface 321 are not coplanar. In other words, when the longitudinal dividing strip 31 is disposed higher than the lateral dividing strip 32, that is, the first top surface 311 of the longitudinal dividing strip 31 is higher than the second top surface 321 of the lateral dividing strip 32.

Alternatively, the longitudinal dividing strip 31 may have a lower thickness than the lateral dividing strip 32, that is, the second top surface 321 of the lateral dividing strip 32 is higher than the first top surface 311 of the longitudinal dividing strip 31.

When the longitudinal partitioning strip 31 and the lateral partitioning strip 32 are arranged with a high and low drop, the structural design of the high and low drop can facilitate the uniform flow of the liquid crystal and increase the uniformity of the liquid crystal filling. Moreover, since the structural design of the high and low drop is away from the contact surface when the front substrate and the liquid crystal are filled, the above advantages can be maintained and the uniformity of liquid crystal filling can be increased.

As shown in FIG. 2, the width of the mesh spacer 30 is smaller than the width of the black matrix 12, and the black matrix 12 is blocked, and the material of the mesh spacer 30 may be a heat hardening material or an ultraviolet hardening material, for example, a press. Force resin, because acrylic resin is a highly transparent material, so it does not affect the panel transmittance. Further, the area surrounded by the mesh spacer 30 may be one pixel or a plurality of pixels.

The mesh spacer 30 is produced in the same manner as the general photoresist exposure development method. It should be noted that the longitudinal partition strip 31 and the lateral partition strip 32 can be respectively fabricated using acrylic resin photoresists having different thermal expansion coefficients, so that it is more helpful to relieve the adhesion of the liquid crystal to the surface of the protective layer.

3 is a side elevational view of a mesh spacer 30 in accordance with another embodiment of the present invention. Referring to FIG. 3, the mesh spacer 30 has a top surface and a bottom surface, and the width of the top surface may be smaller than the width of the bottom surface thereof, that is, the mesh spacer 30 may have a narrow upper width design.

In detail, at least one of the longitudinal dividing strip 31 and the lateral dividing strip 32 included in the mesh spacer 30 may have these upper narrow and wide width designs, for example, all of the longitudinal dividing strip 31 and the lateral dividing strip 32 are The design has an upper narrow bottom width design, or only one of the longitudinal partition strip 31 and the lateral partition strip 32 has an upper narrow width.

Therefore, the mesh spacers 30 composed of the longitudinal partition strips 31 and the lateral partition strips 32 can replace the spacer layer (SPACER) used in the original display panel, so that the uniformity of the panel is better. In addition, these mesh spacers 30 can be applied to general ferroelectric displays in addition to the ferroelectric color sequence panel.

4 is a perspective view showing the configuration of a mesh spacer 30 according to another embodiment of the present invention. Referring to FIG. 4, the liquid crystal display of the present embodiment is similar to the liquid crystal display 1 of the foregoing embodiment except that the shape of the mesh spacer 30 is different.

In the present embodiment, the mesh spacer 30 also includes a plurality of longitudinal partition strips 31 and a plurality of lateral partition strips 32. However, the shape of the longitudinal partition strips 31 or the lateral partition strips 32 of this embodiment is as shown in FIG. The longitudinal dividing strips 31 or the lateral dividing strips 32 are different.

For example, as shown in FIG. 4, the difference is that the longitudinal dividing strip 31 has a plurality of grooves 33 whose bottom faces face the second substrate 20. That is to say, the top surface of the longitudinal dividing strip 31 does not completely exhibit a complete horizontal plane.

Similarly, the same groove 33 may be disposed only on the top surface of the lateral partition strip 32 (not shown). In other words, at least one of the longitudinal dividing strip 31 and the lateral dividing strip 32 may have these grooves 33, for example, all of the longitudinal dividing strips 31 and the lateral dividing strips 32 have grooves, or only the longitudinal dividing strips 31. One of the lateral divider strips 32 has a groove. Through the design of these groove structures, the uniformity of liquid crystal filling is increased.

Fig. 5 is a perspective view showing the arrangement of a mesh spacer 30 according to another embodiment of the present invention. Referring to FIG. 5, the liquid crystal display of the present embodiment is similar to the liquid crystal display of the foregoing embodiment, except that the difference is also in the shape of the mesh spacer 30.

In the present embodiment, the mesh spacer 30 includes a structural design of at least one convex portion 34. For example, referring to FIG. 5, the lateral partition strip 32 of the mesh spacer 30 may include a plurality of convex portions 34 disposed on one side of one of the lateral partition strips 32, and the shape of the convex portion 34 is half. Round, a trapezoid or a cone.

When the liquid crystal is filled in by the printing method, since a large amount of liquid crystal is filled at a time, bubbles are likely to be generated inside the liquid crystal and cannot be removed. However, by the structural design of the convex portions 34, the chance of bubble generation can be reduced.

In addition, the structural design of the convex portions 34 may be disposed on both sides of the lateral dividing strips 32. That is, the lateral dividing strips 32 may include a plurality of first convex portions 341 and a plurality of second convex portions 342, wherein The first convex portion 341 is disposed opposite to the second convex portion 342 (as shown in FIG. 6).

Of course, the design of the protrusion structures may also be disposed on one side or both sides of the longitudinal partition strips 31, that is, at least one of the longitudinal partition strips 31 and the lateral partition strips 32 may have these protrusions 34, for example All of the longitudinal dividing strips 31 and the lateral dividing strips 32 have convex portions 34, or only one of the longitudinal dividing strips 31 and the lateral dividing strips 32 has convex portions 34. Through the structural design of these convex portions 34, the uniformity of liquid crystal filling can be increased.

In particular, the mesh spacers 30 shown in Figures 4 and 5 are merely illustrative and are not intended to limit the invention. More specifically, the groove 33 design of FIG. 4 can be matched with other embodiments of the present invention, and the protrusion 34 of FIG. 5 can also be designed and used in conjunction with other embodiments of the present invention.

For example, in other embodiments not shown, the mesh spacer 30 may be designed to include both the groove 33 as shown in FIG. 4 and the protrusion 34 shown in FIG. That is, the longitudinal dividing strip 31 may include the groove 33 as shown in FIG. 4 and the convex portion 34 shown in FIG. 5, or the lateral dividing strip 32 may include the groove 33 and the figure as shown in FIG. The convex portion 34 shown in Fig. 5, or the longitudinal partitioning strip 31 and the lateral partitioning strip 32, simultaneously include the recess 33 as shown in Fig. 4 and the convex portion 34 shown in Fig. 5.

As described above, in the liquid crystal display of the present invention, the structural design of the mesh spacer disposed on the black matrix layer is different in the horizontal and vertical directions. Therefore, the mesh spacer having a high or low drop or a concave structure or a convex structure design can uniformly flow the liquid crystal during the filling of the liquid crystal to increase the uniformity of the liquid crystal filling.

While the present invention has been described above in the foregoing embodiments, it is not intended to limit the invention, and the equivalents of the modifications and retouchings are still in the present invention without departing from the spirit and scope of the invention. Within the scope of patent protection.

1. . . LCD Monitor

10. . . First substrate

11. . . Transparent conductive substrate

12. . . Black matrix

20. . . Second substrate

30. . . Mesh spacer

31. . . Vertical divider

311. . . First top surface

32. . . Horizontal divider

321. . . Second top surface

33. . . Groove

34. . . Convex

341. . . First convex

342. . . Second convex

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a side elevational view of a liquid crystal display device in accordance with an embodiment of the present invention.

2 is a perspective view showing the configuration of a mesh spacer according to an embodiment of the present invention.

Figure 3 is a side elevational view of a mesh spacer in accordance with one embodiment of the present invention.

4 is a perspective view showing a configuration of a mesh spacer according to another embodiment of the present invention.

Fig. 5 is a perspective view showing the configuration of a mesh spacer according to another embodiment of the present invention.

Figure 6 is a perspective view showing the configuration of a mesh spacer according to another embodiment of the present invention.

10. . . First substrate

11. . . Transparent conductive substrate

12. . . Black matrix

30. . . Mesh spacer

31. . . Vertical divider

311. . . First top surface

32. . . Horizontal divider

321. . . Second top surface

Claims (12)

A liquid crystal display comprising: a first substrate, wherein the first substrate comprises a black matrix; a second substrate; a mesh spacer consisting of a plurality of longitudinal partitions and a plurality of lateral dividers, and is disposed on Between the first substrate and the second substrate, and disposed on the black matrix, wherein the longitudinal partition strips and the lateral partition strips are different in thickness; and a liquid crystal disposed on the first substrate, the a second substrate and a space formed by the mesh spacer; wherein: the mesh spacer further comprises a plurality of first protrusions disposed on one side of the mesh spacer; and the mesh spacer Further comprising a plurality of second protrusions, the second protrusions being located opposite to the first protrusions. The liquid crystal display of claim 1, wherein the longitudinal partition strips and the lateral partition strips have a thickness of between 0.1 and 20 microns. The liquid crystal display of claim 1, wherein the longitudinal partition strips have a first top surface, the lateral partition strips have a second top surface, and the first top surface and the second top surface Not coplanar. The liquid crystal display of claim 1, wherein the mesh spacer comprises a plurality of grooves, and a bottom surface of the grooves is for the The second substrate. The liquid crystal display according to claim 1, wherein the material of the mesh spacer is a thermosetting material or an ultraviolet curing material. The liquid crystal display of claim 1, wherein the material of the mesh spacer is an acrylic resin. The liquid crystal display according to claim 1, wherein the first convex portions are semicircular, trapezoidal or tapered. The liquid crystal display of claim 1, wherein the mesh spacer strip has a top surface and a bottom surface, and the top surface has a width greater than a width of the bottom surface thereof. The liquid crystal display of claim 1, wherein the width of the mesh spacers is smaller than the width of the black matrix. The liquid crystal display of claim 1, wherein the liquid crystal is a ferroelectric liquid crystal. The liquid crystal display of claim 1, wherein the first substrate and the second substrate are composed of a transparent conductive material. The liquid crystal display of claim 11, wherein the transparent conductive material is an indium tin oxide or an indium zinc oxide.