TWI396001B - Liquid crystal display panel - Google Patents

Description

LCD panel

The present invention relates to a liquid crystal display panel, and more particularly to a liquid crystal display panel which can provide a wide viewing angle display effect and a high display aperture ratio.

Today's social multimedia technology is quite developed, and liquid crystal displays with superior features such as high image quality, high space utilization efficiency, low power consumption, and no radiation have gradually become the mainstream of the market. Among them, a multi-domain vertical alignment (MVA) liquid crystal display is a common application of a wide viewing angle liquid crystal display panel.

The conventional multi-domain vertical alignment type liquid crystal display panel utilizes an alignment structure to make liquid crystal molecules in different regions fall at different angles to achieve a wide viewing angle. The alignment structure includes an alignment protrusion or an alignment slit disposed on the electrode.

FIG. 1 illustrates a pixel structure of a conventional liquid crystal display panel. Referring to FIG. 1 , the pixel structure 100 includes an active device 110 and a pixel electrode 120 electrically connected to the active device 110 . The active device 110 is electrically connected to the scan wiring 130 and the data wiring 140 . In addition, the pixel structure 100 further includes a protrusion 150 to make the liquid crystal molecules in the liquid crystal display panel exhibit multi-region alignment, and achieve a wide viewing angle display effect.

However, when the pixel structure 100 is driven, the bump 150 is to the pixel The electric field alignment effect of the intermediate portion A at the edge of the pole 120 is less obvious, and it is difficult to control the alignment direction of the liquid crystal molecules. In addition, the tilting direction of the liquid crystal molecules located at the periphery of the alignment bump or the alignment slit is often discontinuous, resulting in light leakage, which causes the display contrast of the liquid crystal display panel to be lowered. If the light shielding layer is disposed corresponding to the alignment bump or the alignment slit in order to reduce the degree of light leakage, the aperture ratio of the liquid crystal display panel is lowered.

The present invention relates to a liquid crystal display panel which can effectively increase the reaction speed of liquid crystal molecules and maintain a good aperture ratio of a display region.

The present invention provides a liquid crystal display panel having a plurality of pixel regions, including a first substrate, a second substrate, and a liquid crystal layer disposed between the first substrate and the second substrate. The first substrate of each pixel region has a first electrode, and the second substrate of each pixel region has a second electrode. The first electrode has at least one annular outward alignment structure, and the second electrode has at least one point outward alignment structure corresponding to the center of the annular outward alignment structure on the first substrate. The liquid crystal layer has a plurality of liquid crystal molecules, and the liquid crystal molecules in each pixel region are aligned with an alignment electric field between the first electrode and the second electrode. The power line corresponding to the electric field at the annular outward alignment structure is recessed in the first substrate, and the power line corresponding to the point-like outward alignment structure is recessed in the second substrate.

In an embodiment of the invention, the first electrode in each of the pixel regions includes a common electrode, and the second electrode in each pixel region includes a pixel electrode.

In another embodiment, the first electrode in each of the pixel regions includes a pixel electrode, and the second electrode in each pixel region includes a common electrode.

In an embodiment of the invention, the annular outward alignment structure in each of the pixel regions includes an annular groove penetrating the first electrode or an annular rib on the first electrode, and the power line of the electric field is concave. It is facing the annular groove or the annular rib.

In an embodiment of the invention, the point-like outward alignment structure in each of the pixel regions includes a point-shaped hole penetrating through the second electrode or a protrusion on the second electrode.

In an embodiment of the invention, the annular outward alignment structure in each of the pixel regions includes a circular ring or a rectangular ring.

In an embodiment of the present invention, the first substrate in each of the pixel regions and the second substrate in each of the pixel regions each have at least one storage capacitor, and the storage capacitor corresponds to the annular outward alignment structure. Configuration.

In an embodiment of the present invention, the first substrate in each of the pixel regions has at least one PMOS thin film transistor coupled to a scan line, and the vertical projection of the scan line on the first substrate Vertical projection through the annular outward alignment structure on the second substrate and through a point-like outward alignment structure.

Based on the above, in the liquid crystal display panel of the above-described embodiment of the present invention, the liquid crystal molecules in the liquid crystal layer may have a plurality of different tilting directions to enable liquid crystal display by the arrangement of the annular outward alignment structure and the dot-like outward alignment structure. The panel achieves a wide viewing angle and maintains a good display area Rate.

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

In order to prevent the liquid crystal molecules located in the middle portion of the electrode block from being in the middle of the electrode block to react too slowly, an annular outward alignment structure and a point-like outward alignment structure are disposed in the liquid crystal display panel to improve the reaction speed of the liquid crystal molecules and Maintain the effect of the aperture ratio of the display area. The invention is illustrated by the following examples, which are not intended to limit the invention, and those skilled in the art can appropriately modify the following embodiments in accordance with the spirit of the invention, but they also belong to the invention. Within the scope. In addition, for convenience of description, and the description will be more readily understood, the same reference numerals will be used to refer to the similar elements, and the repeated text description may be omitted.

2A is a top view of a single pixel area of a liquid crystal display panel in accordance with an embodiment of the present invention. 2B is a liquid crystal display panel taken along line A-A of FIG. 2A. Referring to FIG. 2A and FIG. 2B , a liquid crystal display panel 200 that can be divided into a plurality of pixel regions includes a first substrate 210 , a second substrate 220 , and a first substrate 210 and a second substrate 220 . The liquid crystal layer 230 is between.

The first substrate 210 of each pixel region has a first electrode 212, and the second substrate 220 of each pixel region has a second electrode 222 thereon. The liquid crystal layer 230 has a plurality of liquid crystal molecules 232 therein, and each pixel region These liquid crystal molecules 232 are aligned with an alignment electric field E between the first electrode 210 and the second electrode 220.

In the embodiment, the first substrate 210 is, for example, an active device array substrate, and the second substrate 220 is, for example, a color filter substrate. At this time, the first electrode 212 is, for example, a pixel electrode on the active device array substrate, and the second electrode 222 is, for example, a common electrode on the color filter substrate.

However, in another embodiment, the first substrate 210 may also be a color filter substrate, wherein the first electrode 212 is a common electrode, and the second substrate 220 may be an active device array substrate, and the second electrode thereon 222 is a pixel electrode. Alternatively, in another embodiment, the first substrate may also be a COA (Color Filter On Array) substrate integrated with a color filter on the active layer or an AOC (Array integrated with the active layer on the color filter). On Color Filter) The first electrode 212 on the substrate is a pixel electrode. At this time, the second substrate may be a glass substrate, a plastic substrate or other suitable substrate, and the second electrode 222 thereon is a common electrode.

In other words, the present invention does not limit the types of the first substrate 210 and the second substrate 220. When possible, the first substrate 210 and the second substrate 220 may be of the foregoing types or other existing types. combination.

Referring to FIGS. 2A and 2B again, in order to achieve an alignment effect of a wide viewing angle, the present embodiment forms an annular-outward alignment structure 214 on the first electrode 212 and a dot on the second electrode 222, respectively. A spot-outward alignment structure 224.

In general, the point-like outward alignment structure 224 in each pixel region may be a protrusion located on the second electrode 222 or a point-shaped hole penetrating the second electrode 222. Similarly, the annular outward alignment structure 214 in each pixel region may be an annular groove extending through the first electrode 212 or an annular rib on the first electrode 212. Also, the point-like outward alignment structure 224 may correspond to the center of the annular outward alignment structure 214.

3 to 5 are cross-sectional views of a single pixel region of different liquid crystal display panels according to other embodiments of the present invention. Referring first to FIG. 3, in the present embodiment, the annular outward alignment structure 314 on the first electrode 312 is, for example, an annular rib, and the point-like outward alignment structure 324 on the second electrode 322 is, for example, a protrusion and a protrusion. Corresponds to the center of the annular rib. In addition, the protrusions may be a conical convex structure, a square pyramidal convex structure or other types of tapered convex structures. With continued reference to FIG. 4, in the present embodiment, the annular outwardly directed alignment structure 414 is, for example, an annular rib, and the point-like outwardly directed alignment structure 424 is, for example, a point-shaped aperture that corresponds to the center of the annular rib.

In yet another embodiment, as shown in FIG. 5, the annular outwardly directed structure 514 can be an annular groove, such as a circular ring, a rectangular ring, or other type. The point-like outwardly directed structure 524 may be a point-shaped hole that corresponds to the center of the annular groove. The spirit and the technical features of the present invention will be understood by those of ordinary skill in the art in view of the description of the present invention, and a reasonable variation and application can be made without departing from the spirit of the invention.

Referring again to FIGS. 2A and 2B, liquid crystal molecules 232 located around the annular outward alignment structure 214 and the point-like outward alignment structure 224 may have a tendency to tilt outward. Therefore, when there is a voltage difference between the first substrate 210 and the second substrate 220 to generate the alignment electric field E, the power line L ₁ corresponding to the alignment electric field E corresponding to the annular outward alignment structure 214 is recessed in the second substrate 220. Also, the recess will face the annular outward alignment structure 214. In addition, the power line L ₂ corresponding to the alignment electric field E corresponding to the point-like outward alignment structure 224 is recessed in the second substrate 220. In other words, the annular outward alignment structure 214 and the dot-like outward alignment structure 224 can tilt the liquid crystal molecules 232 in a plurality of different directions, thereby enabling the liquid crystal display panel 200 to achieve a wide viewing angle.

However, the annular outward alignment structure or the dot-like outward alignment structure for causing the liquid crystal molecules to have a multi-domain alignment may cause a problem that the aperture ratio of the liquid crystal display panel is lowered, in order to reduce the negative effect (ie, the phenomenon of lowering the aperture ratio). Further, in the present invention, the annular outward alignment structure or the point-like outward alignment structure is disposed in the non-display area to maintain a good aperture ratio. A plurality of embodiments are further enumerated below for illustration.

In general, a liquid crystal display panel has a plurality of storage capacitors (Cst) to assist the liquid crystal display panel in achieving display. The storage capacitor may be a MII (Metal-Insulator-ITO) architecture which is a combination of a metal layer/insulation layer/indium tin oxide layer. Alternatively, the storage capacitor may be a MIM (Metal-Insulator-Metal) architecture composed of a metal layer/insulation layer/metal layer. In addition, since the storage capacitor has a metal layer structure and cannot pass light, the storage capacitor is designed to be disposed in a region of the non-display area to maintain the aperture ratio of the liquid crystal display panel.

6 and 7 are cross-sectional views of a single pixel region of a liquid crystal display panel to which two embodiments of the present invention are applied. Referring to FIG. 6 , in the embodiment, the first substrate 610 in each pixel region may have a plurality of storage capacitors 616 . The storage capacitor 616 may be an MII architecture that is a combination of a metal layer 617/insulation layer 618/indium tin oxide layer 619, and the indium tin oxide layer 619 herein may be a pixel electrode. The storage capacitor 616 corresponds to the annular outward alignment structure 614 configuration (only one storage capacitor 616 is schematically illustrated in FIG. 6). By arranging the annular outward alignment structure 614 in correspondence with the storage capacitor 616, the opaque region of the liquid crystal display panel 600 can be reduced as much as possible to increase the aperture ratio of the display region, thereby maintaining good display quality of the liquid crystal display panel 600.

With continued reference to FIG. 7, in another embodiment of the present invention, the storage capacitor 716 may be an MIM architecture that is a combination of a metal layer 717/insulation layer 718/metal layer 719. Since the position where the storage capacitor 716 is located is not the display area, the annular outward alignment structure 714 is disposed corresponding to the storage capacitor 716, so that the liquid crystal molecules 732 around the annular outward alignment structure 714 are not clearly aligned. Affects the aperture ratio of the display area.

In other embodiments, the annular outward alignment structure may also be disposed corresponding to the light shielding metal or the light shielding layer other than the storage capacitor to maintain the display area aperture ratio of the liquid crystal display panel.

8A is a top view of a single pixel area of a liquid crystal display panel in accordance with an embodiment of the present invention. Fig. 8B is a liquid crystal display panel taken along line B-B' of Fig. 8A. Referring to FIG. 8A and FIG. 8B simultaneously, in this embodiment, the first substrate 810 in each pixel region may have multiple couplings to one scan. A positive-type gold oxide half (PMOS) thin film transistor (not shown) of wiring 818 is drawn.

However, since the scan wiring 818 is made of metal, light cannot pass through the scan wiring 818. The position of the scan wiring 818 of the liquid crystal display 800 of the present embodiment is differently designed such that the vertical projection of the scan wiring 818 on the first substrate 810 penetrates the vertical projection of the annular outward alignment structure 814 on the second substrate 820. And through the point-like outward alignment structure 824. Therefore, the annular outward alignment structure 814 on the first electrode 812 and the point-like outward alignment structure 824 on the second electrode 822 can correspond in position to the opaque scan wiring 818, thereby enabling the liquid crystal display panel. The opaque area of 800 is reduced as much as possible to maintain a good aperture ratio of the liquid crystal display panel 800.

As described above, in the liquid crystal display panel of the above-described embodiment of the present invention, the liquid crystal molecules can be tilted in a plurality of different directions by the annular outward alignment structure and the dot-like outward alignment structure, thereby enabling the liquid crystal display panel. Achieve a wide viewing angle effect. At the same time, the annular outward alignment structure and the point-like outward alignment structure can be disposed in the non-display area, and are configured as far as possible corresponding to other non-transmissive elements to maintain the aperture ratio of the display area, so that the liquid crystal display panel has good display quality. .

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧ pixel structure

110‧‧‧Active components

120‧‧‧pixel electrodes

130‧‧‧Scan Wiring

140‧‧‧Data wiring

150‧‧‧ bump

200, 300, 400, 500, 600, 700, 800‧‧‧ LCD panels

210, 810‧‧‧ first substrate

212, 312, 412, 512, 812‧‧‧ first electrode

214, 314, 414, 514, 614, 714, 814‧‧ ‧ annular outward alignment structure

220, 820‧‧‧ second substrate

222, 322, 422, 522, 822‧‧‧ second electrode

224, 324, 424, 524, 824‧‧‧ point-like outward alignment structure

226‧‧‧Color filter film

230‧‧‧Liquid layer

232, 732‧‧‧ liquid crystal molecules

616, 716‧‧‧ storage capacitor

617, 717, 719‧‧‧ metal layers

618, 718‧‧‧ insulation

619‧‧‧Indium tin oxide layer

818‧‧‧Scan wiring

A‧‧‧ area

E‧‧‧Alignment electric field

L ₁ , L ₂ ‧‧‧ power line

A-A’, B-B’‧‧‧ cut line

FIG. 1 illustrates a pixel structure of a conventional liquid crystal display panel.

2A is a top view of a single pixel area of a liquid crystal display panel in accordance with an embodiment of the present invention.

Fig. 2B is a liquid crystal display panel taken along line A-A' of Fig. 2A.

3 to 5 are cross-sectional views of a single pixel region of different liquid crystal display panels according to other embodiments of the present invention.

6 and 7 are cross-sectional views of a single pixel region of a liquid crystal display panel to which two embodiments of the present invention are applied.

8A is a top view of a single pixel area of a liquid crystal display panel in accordance with an embodiment of the present invention.

Fig. 8B is a liquid crystal display panel taken along line B-B' of Fig. 8A.

200‧‧‧LCD panel

210‧‧‧First substrate

212‧‧‧First electrode

214‧‧‧Circular outward alignment structure

220‧‧‧second substrate

222‧‧‧second electrode

224‧‧‧ point-like outward alignment structure

230‧‧‧Liquid layer

232‧‧‧liquid crystal molecules

E‧‧‧Alignment electric field

L ₁ , L ₂ ‧‧‧ power line

Claims (10)

A liquid crystal display panel having a plurality of pixel regions, the liquid crystal display panel comprising: a first substrate, the first substrate of each pixel region having a first electrode, and the first electrode having at least one ring An external alignment structure; a second substrate, the second substrate of each pixel region has a second electrode, and the second electrode has at least one point outward alignment structure corresponding to the first substrate a central portion of the annular outward alignment structure; and a liquid crystal layer disposed between the first substrate and the second substrate, the liquid crystal layer having a plurality of liquid crystal molecules, and the liquid crystal molecules in each pixel region An alignment electric field between the first electrode and the second electrode, wherein the alignment electric field corresponds to a power line at the annular outward alignment structure concave to the first substrate, and the alignment electric field corresponds to the point outward direction The power line at the alignment structure is recessed in the second substrate. The liquid crystal display panel of claim 1, wherein the first electrode in each pixel region comprises a common electrode, and the second electrode in each pixel region comprises a pixel electrode. The liquid crystal display panel of claim 1, wherein the first electrode in each pixel region comprises a pixel electrode, and the second electrode in each pixel region comprises a common electrode. The liquid crystal display panel of claim 1, wherein the annular outward alignment structure in each pixel region comprises an annular groove extending through the first electrode or an annular rib on the first electrode. The liquid crystal display panel of claim 4, wherein The annular outward alignment structure in each pixel region includes an annular groove penetrating the first electrode or an annular rib on the first electrode, and a recess of the power line of the alignment electric field is facing the annular groove Or the annular rib. The liquid crystal display panel of claim 2, wherein the point-like outward alignment structure in each pixel region comprises a point hole penetrating the second electrode or a protrusion on the second electrode. The liquid crystal display panel of claim 1, wherein the annular outward alignment structure in each pixel region comprises a circular ring or a rectangular ring. The liquid crystal display panel of claim 1, wherein the first substrate in each pixel region has at least one storage capacitor, and the storage capacitor corresponds to the annular outward alignment structure. The liquid crystal display panel of claim 1, wherein the second substrate in each pixel region has at least one storage capacitor, and the storage capacitor corresponds to the annular outward alignment structure. The liquid crystal display panel of claim 1, wherein the first substrate in each pixel region has at least one PMOS thin film transistor coupled to a scan line, and the scan The vertical projection of the wiring on the first substrate passes through the vertical projection of the annular outward alignment structure on the second substrate and passes through the point-like outward alignment structure.