TW201421130A - Pixel structure of liquid crystal display panel - Google Patents

Abstract

A pixel structure of a liquid crystal display panel includes a first substrate, a first electrode, a dielectric layer, a second electrode, a second substrate and a liquid crystal layer. The first electrode is disposed on the first substrate. The dielectric layer is disposed on the first substrate and covers the first electrode. The second electrode is disposed on the dielectric layer. The second electrode includes at least one main electrode, a plurality of branch electrodes, and a plurality of slits formed in between adjacent branch electrodes, respectively. The second substrate faces the first substrate. The liquid crystal layer is interposed between the second electrode and the second substrate, and the liquid crystal layer includes a plurality of negative type vertical alignment liquid crystal molecules.

Description

Pixel structure of liquid crystal display panel

The invention relates to a pixel structure of a liquid crystal display panel, in particular to a pixel structure of a fringe electric field type liquid crystal display panel using negative vertical alignment liquid crystal molecules.

With the continuous improvement of liquid crystal display technology, liquid crystal display panels have been widely used in flat-panel televisions, notebook computers, smart phones and various types of consumer electronic products. In order to solve the disadvantage that the viewing angle of the conventional liquid crystal display panel is too small, the industry has developed a wide viewing angle liquid crystal display panel. However, conventional wide viewing angle liquid crystal display panels have disadvantages such as complicated process, misalignment, and color washout when viewed in a large viewing angle, and still need to be further improved.

One of the objects of the present invention is to provide a pixel structure of a liquid crystal display panel to solve the color shift problem and avoid the generation of misalignment points.

An embodiment of the present invention provides a pixel structure of a liquid crystal display panel, including a first substrate, a first electrode, a dielectric layer, a second electrode, a second substrate, and a liquid crystal layer. The first electrode is disposed on the first substrate. The dielectric layer is disposed on the first substrate and covers the first electrode. The second electrode is disposed on the dielectric layer. The second electrode includes at least one main electrode, a plurality of branch electrodes connected to the main electrode, and a plurality of slits respectively formed adjacent to each other Between the branch electrodes. The second substrate is disposed facing the first substrate. The liquid crystal layer is disposed between the second electrode and the second substrate, and the liquid crystal layer includes a plurality of negative-type vertical alignment liquid crystal molecules.

The present invention will be further understood by those of ordinary skill in the art to which the present invention pertains. . In addition, the drawings are for illustrative purposes only and are not drawn to the original size or scale. The following embodiments are exemplified by a pixel structure of a fringe field switching (FFS) liquid crystal display panel, but the pixel structure of the liquid crystal display panel of the present invention is not limited thereto, but may be other A pixel structure of a horizontal electric field type liquid crystal display panel of a type, such as a pixel structure of an in-plane switching (IPS) liquid crystal display panel.

Please refer to Figure 1 and Figure 2. 1 is a cross-sectional view showing a pixel structure of a liquid crystal display panel according to a first embodiment of the present invention, and FIG. 2 is a second diagram showing a pixel structure of a liquid crystal display panel according to a first embodiment of the present invention. A schematic top view of the electrode. As shown in FIG. 1 and FIG. 2, the pixel structure 1 of the liquid crystal display panel of the present embodiment includes a first substrate 10, a first electrode 12, a dielectric layer 14, a second electrode 16, a second substrate 20, and a liquid crystal. Layer 22. The first substrate 10 is a transparent substrate, and the first substrate 10 may be a rigid substrate such as a glass substrate or a quartz substrate, or a flexible substrate such as a plastic substrate. The first electrode 12 is disposed on the first substrate 10, and the first electrode 12 is preferably a full-surface electrode, which is a complete and continuous electrode without a slit or an opening, but is not limited thereto. The dielectric layer 14 is disposed on the first substrate 10 and covers the first electrode 12. Dielectric layer 14 may be a single dielectric layer or a multilayer dielectric layer, and the material may be an inorganic dielectric material such as hafnium oxide, tantalum nitride, hafnium oxynitride, or an organic dielectric material, or an organic/inorganic hybrid material. The second electrode 16 is disposed on the dielectric layer 14 and electrically separated from the first electrode 12 by the dielectric layer 14. At least one of the first electrode 12 and the second electrode 16 may be a transparent electrode, and at least one of the two electrodes may be a single layer or a plurality of layers, and at least one of the two electrodes, such as indium tin oxide (ITO). Electrode, indium zinc oxide (IZO) electrode, but not limited to this. The second substrate 20 is disposed to face the first substrate 10. The second substrate 20 may be a rigid substrate such as a glass substrate or a quartz substrate, or a flexible substrate such as a plastic substrate, and there is no transparent electrode on the second substrate 20 for controlling the rotation of the liquid crystal molecules in the liquid crystal layer 22. The liquid crystal layer 22 is disposed between the second electrode 16 and the second substrate 20, and the liquid crystal layer 22 includes a plurality of negative-type vertical alignment liquid crystal molecules LC. The dielectric anisotropy (Δε) of the negative liquid crystal molecules is less than 0, and the vertical alignment liquid crystal molecules have high contrast. The second electrode 16 of the present embodiment includes at least one main electrode 16M (not shown in FIG. 1), and a plurality of branch electrodes 16B are connected to the main electrode 16M. Further, a slit 16S is provided between the adjacent branch electrodes 16B. In this embodiment, the gaps S of the slits 16S between any two adjacent branch electrodes 16B are equal, and the gap S is a fixed gap, that is, the slit 16S of the second electrode 16 of the present embodiment. Designed for a single gap, the gaps S of all slits 16S are equal. In addition, all of the branch electrodes 16B may have the same width L. In the present embodiment, the width L of the branch electrode 16B and the gap S of the slit 16S may have the following relationship: 0.3 ≦ L / S ≦ 3, but not limited thereto.

The first electrode 12 and the second electrode 16 of the pixel structure 1 of the liquid crystal display panel are respectively Electrodes with two different voltages can be controlled with the same or different thin film transistors (TFTs), respectively. That is, the first electrode 12 and the second electrode 16 are structurally separated from each other, and a gap exists between the first electrode 12 and the second electrode 16. For example, in the present embodiment, the first electrode 12 is a common electrode having a common voltage, and the second electrode 16 is a pixel electrode having a data voltage. In a variant embodiment, the first electrode 12 is a pixel electrode having a data voltage and the second electrode 16 is a common electrode having a common voltage. In another variation, the first electrode 12 and the second electrode 16 may be a first pixel electrode and a second pixel electrode, respectively, which may be controlled by different thin film transistors to have different voltages. The liquid crystal molecules in the liquid crystal layer 22 are driven, or the same thin film transistor is used, which is similar to the capacitive coupling effect or other means to have different voltages to drive the liquid crystal molecules in the liquid crystal layer 22. The pixel structure 1 of the liquid crystal display panel of the present embodiment uses the negative vertical alignment liquid crystal molecules LC, and in the state where there is no potential difference, the negative vertical alignment liquid crystal molecules LC are vertically aligned; at the first electrode 12 and the second electrode 16 Driven by the fringe electric field formed by the potential difference, the negative vertical alignment liquid crystal molecules LC are tilted in multiple directions on the horizontal plane, so that the multi-region alignment effect is obtained, and the color shift problem can be effectively suppressed.

The pixel structure 1 of the liquid crystal display panel of the present invention may further comprise display elements such as gate lines, data lines, storage capacitor lines, active switching elements, alignment films, color filters, and black matrix patterns that must be disposed on the liquid crystal display panel. The functions and configurations of the polarizer and the like are well known to those skilled in the art and will not be described herein.

Please refer to Figures 3 and 4. Figure 3 is a diagram showing a comparative example of the present invention. a relationship between a predetermined gray scale value of a pixel structure of the liquid crystal display panel and a normalized transmittance, and FIG. 4 illustrates a pixel structure of the liquid crystal display panel of the first embodiment of the present invention. A plot of the predetermined grayscale value versus the normalized penetration rate. The pixel structure of the liquid crystal display panel of the comparative example of the present invention uses positive vertical alignment liquid crystal molecules (dielectric anisotropy (Δε) is larger than 0). Positive vertical alignment liquid crystal molecules in the state without potential difference, the positive vertical alignment liquid crystal molecules LC are vertically aligned; driven by the fringe electric field formed by the potential difference between the data voltage and the common voltage, the positive vertical alignment liquid crystal molecules LC will follow It is dumped in a single direction on the horizontal plane, so it does not have the effect of multi-zone alignment. In Fig. 3, curve A shows the relationship between the predetermined gray scale value and the normalized transmittance in the front view direction of the pixel structure of the liquid crystal display panel of the comparative example; and curve B shows the liquid crystal display of the comparative example. The pixel structure of the panel (the width of the branch electrode is about 4 microns and the gap of the slit is about 4 microns). The relationship between the predetermined gray scale value in the side view direction and the normalized transmittance; and the curve C shows the contrast. The pixel structure of the liquid crystal display panel of the embodiment (the width of the branch electrode is about 8 μm and the gap of the slit is about 8 μm) is the relationship between the predetermined gray scale value and the normalized transmittance in the side view direction. As shown in Fig. 3, the simulation results show that the pixel structure of the liquid crystal display panel of the comparative example using the positive type vertical alignment liquid crystal molecules has a significant color shift problem in the side view direction.

In Fig. 4, a curve A' shows the relationship between the predetermined gray scale value and the normalized transmittance in the front view direction of the pixel structure of the liquid crystal display panel of the first embodiment; the curve B' shows the first implementation. The pixel structure of the liquid crystal display panel (the width of the branch electrode is about 3 μm and the gap of the slit is about 3 μm), and the predetermined gray scale value and the return in the side view direction The relationship of the transmittance; the curve C' shows the pixel structure of the liquid crystal display panel of the first embodiment (the width of the branch electrode is about 4 μm and the gap of the slit is about 4 μm) in the side view direction. The relationship between the predetermined gray scale value and the normalized transmittance; the curve D' shows the pixel structure of the liquid crystal display panel of the first embodiment (the width of the branch electrode is about 5 μm and the gap of the slit is about 6 μm) The relationship between the predetermined gray scale value and the normalized transmittance in the side view direction; and the curve E' shows the pixel structure of the liquid crystal display panel of the first embodiment (the width of the branch electrode is about 6 μm and the slit The gap is approximately 6 microns. The relationship between the predetermined gray scale value in the side view direction and the normalized transmittance. As shown in Fig. 4, the simulation results show that the pixel structure of the liquid crystal display panel of the first embodiment using the negative-type vertical alignment liquid crystal molecules has a significant improvement in the color shift problem in the side view direction.

Please refer to Figure 5. Fig. 5 is a view showing the pixel structure of a liquid crystal display panel according to a variation of the first embodiment of the present invention. As shown in FIG. 5, unlike the first embodiment, in the pixel structure 1' of the liquid crystal display panel of the present variation, the branch electrode 16B of the second electrode 16 can be divided into a plurality of branch electrodes having different widths. . For example, the branch electrode 16B of the present embodiment includes a first branch electrode 16B1, a second branch electrode 16B2, and a third branch electrode 16B3. The first branch electrode 16B1 has a first width L1, the second branch electrode 16B2 has a second width L2, the third branch electrode 16B3 has a third width L3, and the first width L1, the second width L2, and the third width L3 Not equal. In addition, the slit 16S of the second electrode 16 can be divided into a plurality of slits having different gaps. For example, the slit 16S of the second electrode 16 of the embodiment includes a first slit 16S1, a second slit 16S2 and a third slit 16S3. The first slit 16S1 has a first gap S1, and the second slit 16S2 has a second gap S2, third The slit 16S3 has a third gap S3, and the first gap S1, the second gap S2, and the third gap S3 are all unequal. The first gap S1, the second gap S2, and the third gap S3 are both fixed gaps. In this variant embodiment, the first width L1, the second width L2 and the third width L3, and the first gap S1, the second gap S2 and the third gap S3 may have the following relationship: 0.3≦L1/S1≦3, 0.3 ≦L2/S2≦3 and 0.3≦L3/S3≦3. In other embodiments, the first width L1, the second width L2 and the third width L3, and the first gap S1, the second gap S2, and the third gap S3 may have the following relationship: 0.5≦L1/S1≦1.5, 1≦ L2/S2≦3 and 1≦L3/S3≦3, preferably: L1/S1=1, L2/S2=2, and L3/S3=1.5, but not limited thereto. The slit 16S of the second electrode 16 of the present embodiment has a multi-gap design, has a better multi-zone alignment effect, and can effectively suppress the color shift problem.

Please refer to Figure 6. Figure 6 is a diagram showing the relationship between the predetermined gray scale value and the normalized transmittance of the pixel structure of the liquid crystal display panel according to the modified embodiment of the first embodiment of the present invention. In Fig. 6, the curve A" shows the relationship between the predetermined gray scale value and the normalized transmittance in the front view direction of the pixel structure of the liquid crystal display panel of the modified embodiment; the curve B" shows the variation of the embodiment The relationship between the predetermined gray scale value and the normalized transmittance in the side view direction of the pixel structure of the liquid crystal display panel (L1/S1=1, L2/S2=2, L3/S3=1.5); and the curve C" The pixel structure (L1/S1=1, L2/S2=0.6, L3/S3=2.5) of the liquid crystal display panel of the modified embodiment is shown in the side view direction with a predetermined gray scale value and a normalized transmittance. Relationship. As shown in Fig. 6, the simulation results show that the pixel structure of the liquid crystal display panel of the modified embodiment using the negative-type vertical alignment liquid crystal molecules has a significant improvement in the color shift problem in the side view direction.

The pixel structure of the liquid crystal display panel of the present invention is not limited to the above embodiment. The pixel structure of the liquid crystal display panel of other preferred embodiments of the present invention will be sequentially described below, and the same symbols are used in the following embodiments for the purpose of comparing the differences of the embodiments and simplifying the description. The components are mainly described for the differences between the embodiments, and the repeated portions are not described again. In addition, the drawings of the respective embodiments below show a partial enlarged view of the second electrode, so please refer to the schematic diagram of the pixel structure of the liquid crystal display panel shown in FIGS. 1 and 2 together.

Please refer to Figure 7. Fig. 7 is a view showing the pixel structure of the liquid crystal display panel of the second embodiment of the present invention. As shown in FIG. 7, in the second embodiment, the branch electrode 16B of the second electrode 16 includes a plurality of first branch electrodes 16B1 and a plurality of second branch electrodes 16B2. The first branch electrode 16B1 and the second branch electrode 16B2 are alternately arranged, the first branch electrode 16B1 has a first width L1, and the second branch electrode 16B2 has a second width L2, wherein the first width L1 is a fixed width, and the second The width L2 is decreased from the inner side of the main electrode 16M toward the outer side away from the main electrode 16M. Thereby, the gap S of each slit 16S is increased from the inner side close to the trunk electrode 16M toward the outer side away from the main electrode 16M. Further, in the present embodiment, the second width L2 of each of the second branch electrodes 16B2 is discretely decreasing from the inner side of the main electrode 16M toward the outer side away from the main electrode 16M. For example, the first branch electrode 16B1 may be, for example, a straight strip electrode whose first width L1 is a fixed width, and the second branch electrode 16B2 may be a stepped electrode whose second width L2 is close to the main electrode 16M. The inner side is discontinuously discontinuous away from the outer side of the main electrode 16M (ie, The second width L2 has a plurality of different width values, whereby the gap S can be discontinuously increased from the inner side of the main electrode 16M toward the outer side away from the main electrode 16M. The width value of the second width L2 can be adjusted as needed, such as two different width values, three different width values, or more.

The slit of the second electrode of the pixel structure of the liquid crystal display panel of the present embodiment has a decreasing gap design for the purpose of avoiding the occurrence of a disclination node. The so-called misalignment means that in the case where the electrode has a fixed gap, the tilting direction of the liquid crystal molecules at some positions may be unclear and a dark spot may be generated. For example, in a pixel region, liquid crystal molecules near the middle of the branch electrode are subjected to the driving voltage of the main electrode in the same pixel region and the driving voltage of the main electrode in another adjacent pixel region. The effect is that the liquid crystal molecules at this position are affected by electric fields of different directions. Once the intensities of the two electric fields are close to each other, the tilting direction of the liquid crystal molecules is unclear and dark spots are generated. The degree of tilting of the liquid crystal molecules depends on the electric field strength received, and the electric field strength (E), the driving voltage (V) and the electrode spacing (d) have a column relationship: E = V / d. That is to say, under the same driving voltage, the electric field strength is inversely proportional to the electrode spacing. In the present embodiment, since the gap S is increased from the inner side close to the main electrode 16M toward the outer side away from the main electrode 16M, the electric field intensity corresponding to the gap S is decreased from the inner side close to the main electrode 16M toward the outer side away from the main electrode 16M. . Under this condition, liquid crystal molecules at any position are driven by an electric field in the same direction, which can effectively avoid the formation of a misalignment point, thereby improving display quality.

Please refer to Figure 8. Figure 8 is a diagram showing the first variation of the second embodiment of the present invention. A schematic diagram of a pixel structure of a liquid crystal display panel of the embodiment. As shown in FIG. 8, unlike the second embodiment, in the first variation, the second electrode 16 includes a plurality of branch electrodes 16B, each of the branch electrodes 16B has a width L, and the width L is close to the main electrode. The inner side of 16M is discontinuously discontinuously away from the outer side of the main electrode 16M. For example, each branch electrode 16B can be a stepped electrode, but is not limited thereto. Thereby, the gap S of each slit 16S is discontinuously increased from the inner side close to the trunk electrode 16M toward the outer side away from the main electrode 16M. Therefore, the electric field intensity corresponding to the gap S is decreased from the inner side close to the trunk electrode 16M toward the outer side away from the main electrode 16M. Under this condition, liquid crystal molecules at any position are driven by an electric field in the same direction, which can effectively avoid the formation of a misalignment point, thereby improving display quality.

Please refer to Figure 9. FIG. 9 is a schematic view showing a pixel structure of a liquid crystal display panel according to a second modified embodiment of the second embodiment of the present invention. As shown in FIG. 9, in the second modified embodiment, the branch electrode 16B of the second electrode 16 includes a plurality of first branch electrodes 16B1 and a plurality of second branch electrodes 16B2. The first branch electrode 16B1 and the second branch electrode 16B2 are alternately arranged, the first branch electrode 16B1 has a first width L1, and the second branch electrode 16B2 has a second width L2, wherein the first width L1 is a fixed width, and the second The width L2 is decreased from the inner side of the main electrode 16M toward the outer side away from the main electrode 16M. Thereby, the gap S of each slit 16S is increased from the inner side close to the trunk electrode 16M toward the outer side away from the main electrode 16M. Further, in the second modified embodiment, the second width L2 of each of the second branch electrodes 16B2 is continuously decreasing from the inner side of the main electrode 16M toward the outer side away from the main electrode 16M. For example, the first branch electrode 16B1 may be, for example, a straight strip electrode, the A width L1 is a fixed width, and the second branch electrode 16B2 may be a trapezoidal electrode whose second width L2 is continuously decreased from the inner side of the main electrode 16M toward the outer side away from the main electrode 16M, whereby the gap S may be close to the trunk The inner side of the electrode 16M continuously increases away from the outer side of the main electrode 16M. Therefore, the electric field intensity corresponding to the gap S is decreased from the inner side close to the trunk electrode 16M toward the outer side away from the main electrode 16M. Under this condition, liquid crystal molecules at any position are driven by an electric field in the same direction, which can effectively avoid the formation of a misalignment point, thereby improving display quality.

Please refer to Figure 10. FIG. 10 is a schematic view showing a pixel structure of a liquid crystal display panel according to a third modified embodiment of the second embodiment of the present invention. As shown in FIG. 10, unlike the second variation embodiment, in the third variation embodiment, the second electrode 16 includes a plurality of branch electrodes 16B, each of the branch electrodes 16B has a width L, and the width L is close to the trunk. The inner side of the electrode 16M continuously decreases away from the outer side of the main electrode 16M. For example, each branch electrode 16B can be a trapezoidal electrode, but is not limited thereto. Thereby, the gap S of each slit 16S is continuously increased from the inner side close to the trunk electrode 16M toward the outer side away from the main electrode 16M. Therefore, the electric field intensity corresponding to the gap S is decreased from the inner side close to the trunk electrode 16M toward the outer side away from the main electrode 16M. Under this condition, liquid crystal molecules at any position are driven by an electric field in the same direction, which can effectively avoid the formation of a misalignment point, thereby improving display quality.

Please refer to Figure 11. 11 is a schematic view showing a pixel structure of a liquid crystal display panel of a third embodiment of the present invention. As shown in FIG. 11, in the third embodiment, the branch electrode 16B of the second electrode 16 includes a plurality of first branch electrodes 16B1 and a plurality of strips Two branch electrodes 16B2. The first branch electrode 16B1 and the second branch electrode 16B2 are alternately arranged, the first branch electrode 16B1 has a first width L1, and the second branch electrode 16B2 has a second width L2, wherein the first width L1 is a fixed width, and the second The width L2 is increased from the inner side of the main electrode 16M toward the outer side away from the main electrode 16M. Thereby, the gap S of each slit 16S is decreased toward the outer side away from the trunk electrode 16M from the inner side of the trunk electrode 16M. Further, in the present embodiment, the second width L2 of each of the second branch electrodes 16B2 is discontinuously increased from the inner side close to the trunk electrode 16M toward the outer side away from the main electrode 16M. For example, the first branch electrode 16B1 may be, for example, a straight strip electrode whose first width L1 is a fixed width, and the second branch electrode 16B2 may be a stepped electrode whose second width L2 is close to the main electrode 16M. The inner side is discontinuously discontinuously away from the outer side of the main electrode 16M, whereby the gap S may be discontinuously decreased from the inner side close to the main electrode 16M toward the outer side away from the main electrode 16M.

In the present embodiment, since the gap S is decreased from the inner side of the main electrode 16M toward the outer side away from the main electrode 16M, the electric field intensity corresponding to the gap S is increased from the inner side close to the main electrode 16M toward the outer side away from the main electrode 16M. . Under this condition, the liquid crystal molecules at any position are driven by the electric field in the same direction to effectively avoid the formation of misalignment points, thereby improving the display quality.

Please refer to Figure 12. Figure 12 is a diagram showing the pixel structure of a liquid crystal display panel according to a first variation of the third embodiment of the present invention. As shown in FIG. 12, unlike the second embodiment, in the first variation, the second electrode 16 includes a plurality of branch electrodes 16B, each of the branch electrodes 16B has a width L, and the width L is close to the trunk. The inner side of the electrode 16M is discontinuously increased away from the outer side of the main electrode 16M. For example, each branch electrode 16B can be a stepped electrode, but is not limited thereto. Thereby, the gap S of each slit 16S is discontinuously discontinuously from the inner side of the trunk electrode 16M toward the outer side away from the trunk electrode 16M. Therefore, the electric field intensity corresponding to the gap S is increased from the inner side of the main electrode 16M toward the outer side away from the main electrode 16M. Under this condition, the liquid crystal molecules at any position are driven by the electric field in the same direction to effectively avoid the formation of misalignment points, thereby improving the display quality.

Please refer to Figure 13. Figure 13 is a diagram showing the pixel structure of a liquid crystal display panel according to a second modified embodiment of the third embodiment of the present invention. As shown in Fig. 13, in the second modified embodiment, the branch electrode 16B of the second electrode 16 includes a plurality of first branch electrodes 16B1 and a plurality of second branch electrodes 16B2. The first branch electrode 16B1 and the second branch electrode 16B2 are alternately arranged, the first branch electrode 16B1 has a first width L1, and the second branch electrode 16B2 has a second width L2, wherein the first width L1 is a fixed width, and the second The width L2 is increased from the inner side of the main electrode 16M toward the outer side away from the main electrode 16M. Thereby, the gap S of each slit 16S is decreased toward the outer side away from the trunk electrode 16M from the inner side of the trunk electrode 16M. Further, in the second modified embodiment, the second width L2 of each of the second branch electrodes 16B2 is continuously increased from the inner side close to the trunk electrode 16M toward the outer side away from the main electrode 16M. For example, the first branch electrode 16B1 may be, for example, a straight strip electrode having a first width L1 of a fixed width, and the second branch electrode 16B2 may be a trapezoidal electrode whose second width L2 is close to the inner side of the stem electrode 16M. Continuously increasing away from the outer side of the main electrode 16M, whereby the gap S can be moved away from the inner side of the main electrode 16M toward the main electrode The outer side of 16M is continuously decreasing. Therefore, the electric field intensity corresponding to the gap S is increased from the inner side of the main electrode 16M toward the outer side away from the main electrode 16M. Under this condition, the liquid crystal molecules at any position are driven by the electric field in the same direction to effectively avoid the formation of misalignment points, thereby improving the display quality.

Please refer to Figure 14. Figure 14 is a diagram showing the pixel structure of a liquid crystal display panel according to a third modified embodiment of the third embodiment of the present invention. As shown in FIG. 14, unlike the second variation embodiment, in the third variation embodiment, the second electrode 16 includes a plurality of branch electrodes 16B, each of the branch electrodes 16B has a width L, and the width L is close to the trunk. The inner side of the electrode 16M continuously increases away from the outer side of the main electrode 16M. For example, each branch electrode 16B can be a trapezoidal electrode, but is not limited thereto. Thereby, the gap S of each slit 16S is continuously decreased from the inner side close to the trunk electrode 16M toward the outer side away from the main electrode 16M. Therefore, the electric field intensity corresponding to the gap S is increased from the inner side of the main electrode 16M toward the outer side away from the main electrode 16M. Under this condition, the liquid crystal molecules at any position are driven by the electric field in the same direction to effectively avoid the formation of misalignment points, thereby improving the display quality.

Please refer to Figure 15. Fig. 15 is a view showing the pixel structure of the liquid crystal display panel of the fourth embodiment of the present invention. As shown in FIG. 15, in the fourth embodiment, the branch electrode 16B of the second electrode 16 includes a plurality of first branch electrodes 16B1 and a plurality of second branch electrodes 16B2, wherein the first branch electrodes 16B1 and the second branch electrodes 16B2 is alternately arranged, the first branch electrode 16B1 has a first width L1, and the second branch electrode 16B2 has a second width L2, the first width L1 is a fixed width, and the second The width L2 is a fixed width, and the first width L1 may be equal to the second width L2, but is not limited thereto. The first branch electrodes 16B1 are substantially parallel to each other, the second branch electrodes 16B2, and the first branch electrodes 16B1 and the second branch electrodes 16B2 are not parallel. In this embodiment, the respective extending directions of the first branch electrode 16B1 and the second branch electrode 16B2 substantially constitute a V-shape, but are not limited thereto. In addition, the slit 16S includes a plurality of first slits 16S1 and a plurality of second slits 16S2, wherein the first slits 16S1 and the second slits 16S2 are alternately arranged. Each of the first slits 16S1 has a first gap S1, and each of the first slits S1 is increased from the inner side of the main electrode 16M toward the outer side of the main electrode 16M, and each of the second slits 16S2 has a second gap S2. Each of the second gaps S2 is decremented from the inner side of the main electrode 16M toward the outer side away from the main electrode 16M.

In the present embodiment, since the first gap S1 is increased from the inner side of the main electrode 16M toward the outer side away from the main electrode 16M, and the first gap S2 is decreased from the inner side of the main electrode 16M toward the outer side away from the main electrode 16M, Therefore, the electric field intensity corresponding to the first gap S1 decreases from the inner side of the main electrode 16M toward the outer side away from the main electrode 16M, and the electric field intensity corresponding to the second gap S2 is from the inner side of the main electrode 16M toward the far side away from the main electrode 16M. The outside is incremented. Under this condition, the liquid crystal molecules at any position are driven by the electric field in the same direction to effectively avoid the formation of misalignment points, thereby improving the display quality.

In summary, the pixel structure of the liquid crystal display panel of the present invention uses negative vertical alignment liquid crystal molecules, which can effectively increase the contrast and viewing angle and suppress the color shift problem. In addition, the pixel structure of the liquid crystal display panel of the present invention has an increasing or decreasing electrode spacing, which is effective Increasing the alignment of liquid crystal molecules, thereby avoiding the generation of misalignment points.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

1‧‧‧Pixel structure of liquid crystal display panel

10‧‧‧First substrate

12‧‧‧First electrode

14‧‧‧Dielectric layer

16‧‧‧second electrode

20‧‧‧second substrate

22‧‧‧Liquid layer

LC‧‧‧negative vertical alignment liquid crystal molecules

16M‧‧‧Main electrode

16B‧‧‧ branch electrode

16S‧‧‧slit

S‧‧‧ gap

L‧‧‧Width

1'‧‧‧Pixel structure of liquid crystal display panel

16B1‧‧‧First branch electrode

16B2‧‧‧Second branch electrode

16B3‧‧‧third branch electrode

L1‧‧‧ first width

L2‧‧‧ second width

L3‧‧‧ third width

16S1‧‧‧first slit

16S2‧‧‧Second slit

16S3‧‧‧ third slit

1 is a cross-sectional view showing a pixel structure of a liquid crystal display panel according to a first embodiment of the present invention.

2 is a top plan view showing a second electrode of a pixel structure of a liquid crystal display panel according to a first embodiment of the present invention.

FIG. 3 is a view showing a relationship between a predetermined gray scale value and a normalized transmittance of a pixel structure of a liquid crystal display panel according to a comparative embodiment of the present invention.

Fig. 4 is a view showing the relationship between the predetermined gray scale value and the normalized transmittance of the pixel structure of the liquid crystal display panel of the first embodiment of the present invention.

Fig. 5 is a view showing the pixel structure of a liquid crystal display panel according to a variation of the first embodiment of the present invention.

Figure 6 is a diagram showing the relationship between the predetermined gray scale value and the normalized transmittance of the pixel structure of the liquid crystal display panel according to the modified embodiment of the first embodiment of the present invention.

Fig. 7 is a view showing the pixel structure of the liquid crystal display panel of the second embodiment of the present invention.

FIG. 8 is a schematic view showing a pixel structure of a liquid crystal display panel according to a first variation of the second embodiment of the present invention.

Figure 9 is a view showing a liquid crystal display surface of a second modified embodiment of the second embodiment of the present invention. Schematic diagram of the pixel structure of the board.

FIG. 10 is a schematic view showing a pixel structure of a liquid crystal display panel according to a third modified embodiment of the second embodiment of the present invention.

11 is a schematic view showing a pixel structure of a liquid crystal display panel of a third embodiment of the present invention.

Figure 12 is a diagram showing the pixel structure of a liquid crystal display panel according to a first variation of the third embodiment of the present invention.

Figure 13 is a diagram showing the pixel structure of a liquid crystal display panel according to a second modified embodiment of the third embodiment of the present invention.

Figure 14 is a diagram showing the pixel structure of a liquid crystal display panel according to a third modified embodiment of the third embodiment of the present invention.

Fig. 15 is a view showing the pixel structure of the liquid crystal display panel of the fourth embodiment of the present invention.

1‧‧‧Pixel structure of liquid crystal display panel

10‧‧‧First substrate

12‧‧‧First electrode

14‧‧‧Dielectric layer

16‧‧‧second electrode

20‧‧‧second substrate

22‧‧‧Liquid layer

LC‧‧‧negative vertical alignment liquid crystal molecules

16S‧‧‧slit

16B‧‧‧ branch electrode

L‧‧‧Width

S‧‧‧ gap

Claims (19)

A pixel structure of a liquid crystal display panel, comprising: a first substrate; a first electrode disposed on the first substrate; a dielectric layer disposed on the first substrate and covering the first electrode; a second electrode disposed on the dielectric layer, wherein the second electrode comprises: at least one main electrode; a plurality of branch electrodes connected to the at least one main electrode; and a plurality of slits respectively formed adjacent to each other Between the branch electrodes; a second substrate facing the first substrate; and a liquid crystal layer disposed between the second electrode and the second substrate, wherein the liquid crystal layer comprises a plurality of negative patterns Vertical alignment of liquid crystal molecules. The pixel structure of the liquid crystal display panel of claim 1, wherein the first electrode and the second electrode are electrodes having different voltages. The pixel structure of the liquid crystal display panel of claim 1, wherein the branch electrodes of the second electrode comprise a first branch electrode and a second branch electrode, the first branch electrode having a first width, The second branch electrode has a second width, and the first width is not equal to the second width. The pixel structure of the liquid crystal display panel of claim 1, wherein the slits of the second electrode comprise a first slit and a second slit, the first slit having a first a gap, the second slit has a second gap, and the first gap is not equal to the second gap. The pixel structure of the liquid crystal display panel of claim 1, wherein each of the slits has a gap, and each of the gaps is increased from an inner side of the main electrode toward an outer side of the main electrode. The pixel structure of the liquid crystal display panel of claim 5, wherein the branch electrodes of the second electrode comprise a plurality of first branch electrodes and a plurality of second branch electrodes, the first branch electrodes and the first The two branch electrodes are alternately arranged, the first branch electrode has a first width, the second branch electrode has a second width, the first width is a fixed width, and the second width is close to the main electrode An inner side decreases toward the outside of one of the main electrodes. The pixel structure of the liquid crystal display panel of claim 6, wherein the second width of each of the second branch electrodes is discretely spaced from the inner side of the main electrode away from the outer side of the main electrode (discretely ) Decrement. The pixel structure of the liquid crystal display panel of claim 6, wherein the second width of each of the second branch electrodes is continuously continuous from the inner side of the main electrode away from the outer side of the main electrode. Decrement. The pixel structure of the liquid crystal display panel of claim 5, wherein the second electrode Each of the branch electrodes has a width that decreases from an inner side of the main electrode toward an outer side away from the one of the main electrodes. The pixel structure of the liquid crystal display panel of claim 9, wherein the width of each of the branch electrodes is discretely decreasing from the inner side of the main electrode toward the outer side away from the main electrode. The pixel structure of the liquid crystal display panel of claim 9, wherein the width of each of the branch electrodes is continuously decreasing from the inner side of the main electrode toward the outer side away from the main electrode. The pixel structure of the liquid crystal display panel of claim 1, wherein each of the slits has a gap, and each of the gaps is decreased from an inner side of the main electrode toward an outer side of the main electrode. The pixel structure of the liquid crystal display panel of claim 12, wherein the branch electrodes of the second electrode comprise a plurality of first branch electrodes and a plurality of second branch electrodes, the first branch electrodes and the first The two branch electrodes are alternately arranged, the first branch electrode has a first width, the second branch electrode has a second width, the first width is a fixed width, and the second width is close to the main electrode An inner side is increased outward from one of the main electrodes. The pixel structure of the liquid crystal display panel of claim 13, wherein each of the second points The second width of the branch electrode is discretely increased from the inner side of the main electrode toward the outer side away from the main electrode. The pixel structure of the liquid crystal display panel of claim 13, wherein the second width of each of the second branch electrodes is continuously continuous from the inner side of the main electrode away from the outer side of the main electrode. Increment. The pixel structure of the liquid crystal display panel of claim 12, wherein each of the branch electrodes of the second electrode has a width, and the width is increased from an inner side of the main electrode toward an outer side of the main electrode. . The pixel structure of the liquid crystal display panel of claim 16, wherein the width of each of the branch electrodes is discretely increased from the inner side of the main electrode to the outer side away from the main electrode. The pixel structure of the liquid crystal display panel of claim 16, wherein the width of each of the branch electrodes is continuously increased from the inner side of the main electrode toward the outer side away from the main electrode. The pixel structure of the liquid crystal display panel of claim 1, wherein the branch electrodes of the second electrode comprise a plurality of first branch electrodes and a plurality of second branch electrodes, the first branch electrodes and the first The two branch electrodes are alternately arranged, the first branch electrode has a first width, and the second branch electrode has a second width, the first a width is a fixed width, the second width is a fixed width, and the slits comprise a plurality of first slits and a plurality of second slits, the first slits and the second slits Arranging alternately, each of the first slits has a first gap, and each of the first gaps is increased from an inner side of the main electrode toward an outer side of the main electrode, and each of the second slits has a second a gap, and each of the second gaps is decreased from the inner side of the main electrode toward the outer side away from the main electrode.