TWI571686B - Pixel electrode - Google Patents

Description

Pixel electrode

The present invention relates to a pixel electrode.

Due to its advantages of lightness, thinness, and energy saving, liquid crystal display panels have been widely used in various electronic products and portable electronic products, such as smart phones, notebook computers, and tablets. PC) and TV (TV), etc. In general, when the electrodes in the liquid crystal display panel are supplied with a voltage, the liquid crystal molecules are driven to rotate, and thereby the transmittance of the light is controlled, thereby achieving a screen display.

One of the objects of the present invention is to provide a pixel electrode whose electrode shape is transparently designed to reduce the liquid crystal reaction time, thereby improving the smoothness of the display screen of the liquid crystal display panel.

An embodiment of the invention provides a pixel electrode comprising a plurality of slits. One of the slits has a first virtual distance a and a second virtual distance b, the first virtual distance a being parallel to the first direction, the second virtual distance b being parallel to the second direction, wherein the first direction is substantially different from the second The direction, the second direction is substantially perpendicular to the optical axis direction, and 2/(3W)≦a/b≦(3W)/2, and W is the width of the sub-pixel.

The pixel electrode of at least one embodiment of the present invention has a special slit pattern design, and the first virtual distance a and the second virtual distance b have a relationship of 2/(3W)≦a/b≦(3W)/2. Therefore, compared with the conventional pixel electrode, the electric field is stronger parallel to the edge of the first direction, forming a shorter dark line distance.

Please refer to FIG. 1 . FIG. 1 is a cross-sectional view of a liquid crystal display panel according to an embodiment of the present invention. The liquid crystal display panel of the present invention is a liquid crystal display panel of a fringe field switching type (FFS). , but not limited to this. As shown in FIG. 1, the liquid crystal display panel of the present embodiment includes a first substrate 10, a second substrate 20, a liquid crystal layer 30, and an active circuit structure layer 40. The structure of the above components and their relative arrangement relationship will be sequentially described below. . The second substrate 20 is disposed opposite to the first substrate 10, and the first substrate 10 and the second substrate 20 are transparent substrates such as a glass substrate, a plastic substrate, a quartz substrate, a sapphire substrate, or other suitable rigid substrate or flexible substrate. The liquid crystal layer 30 is disposed between the first substrate 10 and the second substrate 20, and the liquid crystal layer 30 includes a plurality of liquid crystal molecules. The active circuit structure layer 40 is disposed on the first substrate 10 and located on the first substrate 10 and the liquid crystal layer 30. between. In this embodiment, the active circuit structure layer 40 includes a first insulating layer 42 , a common electrode layer 44 , a second insulating layer 46 , and a pixel electrode layer 48 , and is sequentially stacked on the first substrate 10 , and the active circuit structure The layer 40 has a plurality of pixels, and each pixel may include at least one sub-pixel, wherein the material of the common electrode layer 44 and the pixel electrode layer 48 may be a transparent conductive material, such as indium tin oxide, indium zinc oxide or other suitable The transparent conductive material, and the pixel electrode layer 48 may include a plurality of pixel electrodes, the common electrode layer 44 may include at least one common electrode, and the common electrode layer 44 is electrically insulated from the pixel electrodes and respectively provided with different potentials, Thereby, a fringe electric field is formed to control the rotation of the liquid crystal molecules. In addition, the active circuit structure layer 40 of the embodiment may further include a plurality of switching elements, a plurality of scanning lines, and a plurality of data lines, and each of the switching elements may be electrically connected to the corresponding scanning line, the data line, and the pixel electrode, respectively. Therefore, the switching element can be controlled by the on/off signal provided by the scan line, so that the display gray scale signal transmitted by the data line can be transmitted to the corresponding pixel electrode, thereby causing corresponding rotation of the liquid crystal molecules. In addition, the liquid crystal display panel of the present embodiment may further include a color filter layer 50, a light shielding layer (or black matrix layer) 60, and a polarizer 70. The color filter layer 50 and the light shielding layer 60 may be disposed on the second layer. On the substrate 20, but not limited thereto, the color filter layer 50 and the light shielding layer 60 may be disposed on the first substrate 10 or on different substrates respectively, and the color filter layer 50 is used to display a color picture. The light shielding layer 60 is used to shield the light leakage and non-light transmission regions. The polarizer 70 can be disposed on the outer surface of the first substrate 10 and the outer surface of the second substrate 20 to achieve gray scale display in conjunction with the rotation of the liquid crystal molecules. It should be noted that the liquid crystal display panel of the present invention is not limited to the above structure, and other possible structures such as COA, BOA, etc. are also within the scope of the present invention.

Please refer to FIG. 2A. FIG. 2A is a schematic top view of the pixel electrode of the first embodiment of the present invention. As shown in FIG. 2A, the pixel electrode 100 of the present embodiment includes a plurality of slits 110. For convenience of description, the present embodiment uses 10 slits as an example, but is not limited thereto. The slit 110 has a first virtual distance a parallel to the first direction D1 and a second virtual distance b parallel to the second direction D2, wherein the first direction D1 is substantially non-flat in the second direction D2, and the second direction D2 is substantially The direction perpendicular to the optical axis of one of the polarizers (for example, the polarizer 70 on the outer surface of the first substrate 10 or the polarizer 70 on the outer surface of the second substrate 20 in the above-mentioned first FIG. 1) is 2/( 3W) ≦a/b≦(3W)/2, and W is the width of the sub-pixel. In the embodiment, the width W is the width of the sub-pixel in the first direction D1, but not limited thereto. . In addition, in the embodiment, the slit 110 has two or more widths in the second direction D2, but is not limited thereto. In detail, the slit 110 may include at least one unit pattern 110U, and the first virtual distance a is the width of the unit pattern 110U in the first direction D1, and the second virtual distance b is the unit pattern 110U in the second direction D2. Minimum width. In the present embodiment, the slit 110 includes only a single unit pattern 110U, and the first direction D1 and the second direction D2 are perpendicular to each other, that is, the first direction D1 is parallel to the optical axis direction of one of the polarizers 70, but Not limited to this. In addition, the unit pattern 110U may have a first side 111, a second side 112, a third side 113, and a fourth side 114, wherein the first side 111 and the second side 112 are connected to each other, The three sides 113 and the fourth side 114 are connected to each other. The first side 111 and the fourth side 114 correspond to each other in the second direction D2, and the second side 112 and the third side 113 are in the second direction D2. Corresponding to each other, and the first side 111 and the third side 113 are substantially parallel to the third direction D3, and the second side 112 and the fourth side 114 are substantially parallel to the fourth direction D4, and the first direction D1, The two directions D2, the third direction D3, and the fourth direction D4 are not parallel to each other, that is, the first side 111, the second side 112, the third side 113, and the fourth side 114 are opposite to the polarizer 70. The direction of the optical axis is not parallel or perpendicular, and therefore, the width of the unit pattern 110U in the second direction D2 varies continuously. In the preferred embodiment, the angle between the first side 111 and the second side 112 α is about 160 degrees, but not limited to this. In addition, the unit pattern 110U of the embodiment may further have a fifth side 115 and a sixth side 116, wherein the fifth side 115 is connected between the first side 111 and the fourth side 114, The six side edges 116 are connected between the second side edge 112 and the third side edge 113, and the fifth side edge 115 and the sixth side edge 116 are substantially parallel to the second direction D2. Preferably, the adjacent slits 110 are symmetrical with respect to an imaginary line that is relatively parallel to the first direction D1. In this embodiment, the shape of the slit 110 may be a closed pattern, that is, the unit pattern 110U of the slit 110 may be a closed pattern, such as a hexagonal slit in FIG. 2A, but not limited thereto. In other words, the closed figure may be trapezoidal, rectangular, hexagonal, octagonal, elliptical, elongated, or other suitable polygon, and its inner angle is a right angle or an obtuse angle.

The slits 110 of the pixel electrodes 100 may be arranged to extend along the first direction D1 to form a plurality of slit rows 110R, and the adjacent slit rows 110R are arranged side by side along the second direction D2, and in the present embodiment, The slits 110 of the prime electrode 100 may be arranged in an array. As in FIG. 2A, the pixel electrode 100 may include five slit rows 110R, and each slit row 110R may include two slits 110, that is, draw The slits 110 of the element electrodes 100 may be arranged in a matrix of two rows and five columns, but not limited thereto. In other embodiments, the slits 110 may be arranged according to the size of the slits 110 and the size of the pixel electrodes 100. Rows of ten columns, five rows and one column, four rows and one column, two rows and one column, or other suitable matrix arrangement. In addition, in the second direction D2 in this embodiment, the first side 111 of the slit 110 may be adjacent to and correspond to the fourth side 114 of the adjacent other slit 110, and the slit 110 The second side 112 may be adjacent to and correspond to the third side 113 of the adjacent other slit 110, and since the first side 111 and the fourth side 114 are not parallel to each other, and the second side 112 The third side edges 113 are not parallel to each other. Therefore, the adjacent and corresponding side edges of the adjacent two slits 110 in the second direction D2 are not parallel to each other, and the slit 110 has the second direction D2. The portions of the maximum width correspond to each other, and the portions of the slit 110 having the smallest width correspond to each other. In other words, the slits 110 adjacent in the second direction D2 completely overlap in the second direction D2, and adjacent thereto The sides correspond to each other.

In addition, regarding the portion of the sub-pixel, the single pixel electrode 100 may overlap with at least one sub-pixel, that is, the region of each sub-pixel may be a partial region or an entire region of the single pixel electrode 100. For example, a region of the entire pixel electrode 100, a region of one-half of the pixel electrode 100, and a region of one quarter of the pixel electrode 100, and therefore, the width W of the sub-pixel may be equal to the width of the pixel electrode 100 or It may be one-half or one-quarter of the width of the pixel electrode 100. In the present embodiment, the region of the sub-pixel is the region of the entire pixel electrode 100, so the width W of the sub-pixel in the first direction D1 is equal to the width of the pixel electrode 100 in the first direction D1. Further, in the first direction D1 of the single sub-pixel, the ratio of the sum of the first virtual distances a of the slits 110 to the width W may be greater than or equal to 0.7, for example, in the second diagram, due to the single The first direction D1 in the sub-pixel has two slits 110, so 2a/W ≧ 0.7.

Please refer to FIG. 2B. FIG. 2B is a top view of the pixel electrode of the modified embodiment of the first embodiment of the present invention. As shown in FIG. 2B, the pixel electrode 100' of the present embodiment is identical to the pixel electrode 100 of the first embodiment in the pattern of the electrode, and the difference is that the pixel electrode 100' overlaps with a plurality of sub-pixels. For example, taking FIG. 2B as an example, the pixel electrode 100 ′ is equally divided into quarters in the first direction D1 (eg, dashed lines A-A′, B-B′, C-C′), and the sub-pixels The area is only one of the quarters, the area of the sub-pixel is one quarter of the pixel electrode 100', and the width W of the sub-pixel in the first direction D1 is also the pixel electrode. 100' is a quarter of the width in the first direction D1, and the adjacent sub-pixels may share the same slit 110, but not limited thereto, the pixel electrode 100' may be equally divided into two equal parts. The halving or other suitable division method, and the division direction thereof is not limited to the first direction D1, but may be divided in the second direction. It can be seen that the width W of the sub-pixel in the first direction D1 is at least one complete first virtual distance a of the slit 110 of the pixel electrode 100 ′ or the first virtual distance a of at least one portion and The sum of the widths of the electrodes between the slits. When the single pixel electrode 100' overlaps with the plurality of sub-pixels, the pixel electrode 100' can be bridged across the plurality of sub-pixels, that is, the width of one pixel electrode 100' corresponds to the width of the plurality of sub-pixels. To facilitate high-resolution pixel design.

Please refer to FIG. 3 and FIG. 4 . FIG. 3 is a schematic diagram of the electric field of the pixel electrode 100 of the first embodiment of the present invention, and only shows the area of the single slit 110 of the pixel electrode 100 provided with the driving potential. 4 is a schematic view showing a bright region in which the pixel electrode 100 of the first embodiment of the present invention is supplied with a driving voltage, and only shows a region of a single slit 110 of the pixel electrode 100 to which the driving potential is supplied. (For example, the grayscale is displayed as 255). As shown in FIGS. 3 and 4, the region in the single slit 110 of the present embodiment can be divided into a first region 1101, a second region 1102, a third region 1103, and a fourth region 1104, and when the pixel electrode is When the driving potential is provided by 100, the edge electric field in different directions can be generated by the special pattern design of the slit 110 (as indicated by the arrow in FIG. 3), and the fringe electric fields can respectively correspond to the first side 111, The second side 112, the third side 113, the fourth side 114, the fifth side 115, and the sixth side 116 are thus located on the slit 110 due to the action of the fringe electric fields in the different directions. Part of the liquid crystal molecules rotate horizontally, causing the light transmittance of the first region 1101, the second region 1102, the third region 1103, and the fourth region 1104 in the slit 110 to be increased, thereby generating a bright region LA ( As shown in Figure 4). On the other hand, at the intersection of the respective regions (as shown by the cross-hatched line in Fig. 3), due to the pattern design of the slit 110 of the present embodiment, and the first virtual distance a and the second virtual distance b have 2/. (3W) the relationship of ≦a/b≦(3W)/2, therefore, the pixel electrode 100 of the present embodiment has a strong fringe electric field parallel to the first direction D1 compared to the conventional pixel electrode, and The electric field can affect the rotation of the liquid crystal molecules, so that the liquid crystal molecules located at the interface of the respective regions do not rotate or the rotation angle is too small, thereby generating dark lines, and similarly, on a part of the pixel electrodes 100, for example, the slits 110 At the electrodes, the liquid crystal molecules in this portion are not rotated or the rotation angle is too small due to the weak effect of the edge electric field, thereby generating dark lines, that is, the pixel electrode 100 in the single slit 110. The area will have a distinct bright area LA and dark lines.

Furthermore, the "liquid crystal reaction time" can be defined as "the sum of the rise time and the fall time", and the "rise time" and the "fall time" conform to the following formula: , ,

Where τ _rise represents the rise time, τ _decay represents the fall time, γ represents the rotational viscosity, Δ□ represents the difference in dielectric constant of the liquid crystal molecules, E represents the electric field, K ₁ and K ₂ represent the elastic coefficient, and d represents the gap of the liquid crystal layer 30. , x represents the distance between two adjacent dark lines. It can be seen from the above formula that since the first virtual distance a and the second virtual distance b have a relationship of 2/(3W)≦a/b≦(3W)/2, the pixel electrode 100 of the present embodiment is compared with the conventional one. The pixel electrode has a strong electric field parallel to the edge of the first direction D1, and a dark line is generated in the slit 110, so that the distance of the dark lines generated by the pixel electrode 100 of the embodiment is compared with the conventional one. The distance between the dark lines generated by the pixel electrodes is small, and therefore, the E rise and the decrease of x in the formula are caused, thereby causing the liquid crystal reaction time to decrease. Therefore, when the gap of the liquid crystal layer 30 is 3 micrometers, the liquid crystal reaction time (hereinafter referred to as 25 ° C liquid crystal reaction time) at 25 ° C of the present embodiment can reach about 9.7 milliseconds (ms), and the liquid crystal efficiency is about 67%. (The liquid crystal efficiency can be defined as "the brightness of the white screen of the liquid crystal display panel including the upper and lower polarizers 70 divided by the brightness of the liquid crystal display panel of the upper and lower polarizers 70 in the white screen with the same backlight"), compared with the conventional The design of the pixel electrode, the conventional liquid crystal reaction time is more than about 15 milliseconds, so the pixel electrode 100 of the embodiment can achieve the effect of reducing the liquid crystal reaction time.

The pixel electrode of the present invention is not limited to the above embodiment. The pixel electrodes of other preferred embodiments of the present invention will be sequentially described below, and in order to facilitate the comparison of the differences of the embodiments and simplify the description, the same components are denoted by the same reference numerals in the following embodiments, and The differences between the embodiments will be mainly described, and the repeated parts will not be described again.

Referring to FIG. 5, FIG. 5 is a top view of a pixel electrode according to a variation of the first embodiment of the present invention. As shown in FIG. 5, the difference between the pixel electrode 110'' of the other modified embodiment of the present invention and the first embodiment is the pattern of the partial slit 110 of the pixel electrode 110'' of the modified embodiment. It is composed of a part of the unit pattern 110U. For example, the slit 110 located at both ends of the pixel electrode 110'' is composed of one-half, one-third, one-quarter of the unit pattern 110U, but not Limited. In the present variation, when the gap of the liquid crystal layer 30 is 3 micrometers, the liquid crystal reaction time at 25 ° C can reach about 9.7 milliseconds, and the liquid crystal efficiency is about 55%.

Please refer to FIG. 6. FIG. 6 is a schematic top view of a pixel electrode according to a second embodiment of the present invention. As shown in FIG. 6, the difference between the pixel electrode 200 of the present embodiment and the first embodiment is that the slit 110 of the pixel electrode 200 of the present embodiment has a plurality of unit patterns 110U, and the unit pattern 110U is along The first direction D1 is continuously and repeatedly arranged, and the unit pattern 110U does not have the fifth side 115 and the sixth side 116 described in the first embodiment. In the embodiment, the slit 110 is not a closed figure. However, not limited thereto, for example, one slit row 110R of the pixel electrode 200 may have a plurality of repeatedly arranged unit patterns 110U, but the slits 110 are closed patterns, that is, in the first and last unit patterns 110U. There are a fifth side 115 and a sixth side 116, respectively. As can be seen from the above, since the unit pattern 110U of the present embodiment does not have the fifth side 115 and the sixth side 116, that is, the pixel electrode 200 of the present embodiment is compared with the electrode of the pixel electrode 100 of the first embodiment. The occupied area is small (the portion of the electrode extending in the second direction D2 is reduced), and therefore, compared with the first embodiment, the dark lines on the electrode of the present embodiment are reduced, and the boundary of each area in the slit 110 is dark. The width of the pattern is reduced, that is, the area of the bright area in each area is increased, thereby improving the liquid crystal efficiency. In addition, although the unit pattern 110U of the present embodiment does not have the fifth side 115 and the sixth side 116, since the pixel electrode 200 of the embodiment has the cusp CP, the cusp CP and the common electrode may be provided. The fringe electric field in a plurality of directions, therefore, an electric field parallel to the first direction D1 can still be generated in the slit 110, and the boundary of each region in the slit 110 still has dark lines, and the liquid crystal reaction time can still be lowered. In this embodiment, when the gap of the liquid crystal layer 30 is 3 micrometers, the liquid crystal reaction time of 25 ° C can reach about 9.7 milliseconds, and the liquid crystal efficiency is about 72%, so this embodiment can have a low liquid crystal reaction time and preferably. LCD efficiency.

Please refer to FIG. 7. FIG. 7 is a schematic top view of a pixel electrode according to a variation of the second embodiment of the present invention. As shown in FIG. 7, the difference between the pixel electrode 200' of the modified embodiment and the second embodiment is that the unit pattern 110U of the slit 110 of the pixel electrode 200' of the modified embodiment has the first circular arc. 211, the second arc 212, the third arc 213, and the fourth arc 214, the first arc 211 and the fourth arc 214 correspond to each other in the second direction D2, and the second arc 212 and the third arc 213 correspond to each other in the second direction D2. Since the unit pattern 110U of the modified embodiment has a circular arc, and a fringe electric field of a plurality of directions can be provided between the circular arc and the common electrode, an electric field parallel to the first direction D1 can still be generated in the slit 110, and the slit The junction of each region in 110 still has dark lines, and the liquid crystal reaction time can still be lowered.

Please refer to FIG. 8. FIG. 8 is a schematic top view of a pixel electrode according to a third embodiment of the present invention. As shown in FIG. 8, the difference between the pixel electrode 300 of the present embodiment and the first embodiment is that the first side 111 of the slit 110 and the other slit 110 adjacent to the second direction D2 The third side 113 is adjacent and corresponding, and the second side 112 of the slit 110 is adjacent and corresponding to the fourth side 114 of the other slit 110 adjacent in the second direction D2, in other words, The two adjacent slit rows 110R have a misaligned arrangement of one-half of the first virtual distance a in the first direction D1. In addition, since the two adjacent slit rows 110R are misaligned in the first direction D1, the adjacent slits 110 only partially overlap in the second direction D2, that is, in the second direction D2, The portions of the adjacent slits 110 having the largest width are offset from each other, and the portions of the adjacent slits 110 having the smallest width are also offset from each other. Since the slit 110 of the present embodiment is relatively tight with respect to the first embodiment, the fringe electrode 300 and the common electrode cause a large electric field at the edge, so that the liquid crystal efficiency is high. In the present embodiment, when the gap of the liquid crystal layer 30 is 3 micrometers, the liquid crystal reaction time at 25 ° C can reach about 12.1 milliseconds, and the liquid crystal efficiency is about 69%, so this embodiment can have a low liquid crystal reaction time.

Please refer to FIG. 9. FIG. 9 is a schematic top view of a pixel electrode according to a fourth embodiment of the present invention. As shown in FIG. 9, the pixel electrode 400 of the present embodiment includes a first slit region 401, a second slit region 402, a third slit region 403, and a fourth slit region 404. The first slit region 401 and the third slit region 403 respectively have a plurality of slits 110, and the slit 110 has a first virtual distance a parallel to the first direction D1 and a second virtual distance parallel to the second direction D2 b, wherein the first direction D1 is substantially non-flat in the second direction D2, and the second direction D2 is substantially perpendicular to the optical axis direction of one of the polarizers 70, and 2/(3W)≦a/b≦(3W)/ 2, in the embodiment, the first virtual distance a is the maximum width of each slit 110 in the first direction D1, and the second virtual distance b is the maximum width of each slit 110 in the second direction D2, and The first virtual distances a of the slits 110 may not be identical, that is, the slits 110 may have more than two first virtual distances a. Further, there is a first boundary 411 between the first slit region 401 and the second slit region 402, and a second boundary 412 between the second slit region 402 and the third slit region 403, and a third slit region There is a third boundary 413 between the 403 and the fourth slit region 404, and a fourth boundary 414 between the fourth slit region 404 and the first slit region 401. The first boundary 411 and the third boundary 413 are along the third direction. D3 extends, and the second boundary 412 and the fourth boundary 414 extend along the fourth direction D4, and the first direction D1, the second direction D2, the third direction D3, and the fourth direction D4 are not parallel to each other. In this embodiment, The angle a1 between the third direction D3 and the first direction D1 ranges from about 0 degrees to about 90 degrees, and the angle a2 between the fourth direction D4 and the first direction D1 ranges from about 0 degrees to about 90 degrees. In a preferred embodiment, the angle a1 between the third direction D3 and the first direction D1 and the angle a2 between the fourth direction D4 and the first direction D1 are equal, such that the first boundary 411, the second boundary 412, and the third The boundary 413 and the fourth boundary 414 substantially constitute an X shape.

On the other hand, in the present embodiment, the second slit region 402 and the fourth slit region 404 respectively have a plurality of longitudinal slits 420, and the longitudinal slits 420 have a third virtual distance c parallel to the first direction D1. And a fourth virtual distance d parallel to the second direction D2, and 2/(3W) ≦d/c ≦ (3W)/2, therefore, in FIG. 9, one of the slits in the first slit region 401 110. One of the longitudinal slits 420 of the second slit region 402, one of the slits 110 of the third slit region 403, and one of the longitudinal slits 420 of the fourth slit region 404 may form a "mouth" shape. This embodiment does not obviously have the slit row 110R as described in the foregoing embodiment. In addition, the shape of the slit 110 is preferably mirror-symmetrical with respect to an imaginary line parallel to the first direction D1, and the shape of the longitudinal slit 420 is preferably mirrored by an imaginary line parallel to the second direction D2. Symmetrically, in the present embodiment, the shape of the slit 110 and the longitudinal slit 420 may be a closed figure. For example, the closed figure may be trapezoidal, rectangular, hexagonal, octagonal, elliptical, elongated or Other suitable polygons, and the inner corners thereof are right angles or obtuse angles. In FIG. 9, the slits 110 and the longitudinal slits 420 are exemplified by trapezoids.

Due to the pattern design of the slit 110 of the embodiment, and the first virtual distance a and the second virtual distance b have a relationship of 2/(3W) ≦ a/b ≦ (3W)/2, compared with the conventional The pixel electrode 400 of the present embodiment has a strong fringe electric field parallel to the first direction D1, and the electric field can affect the rotation of the liquid crystal molecules, so that some liquid crystal molecules located in the slit 110 do not rotate. Or the rotation angle is too small, and then the dark lines are generated. Similarly, on the portion of the pixel electrode 400, for example, the electrode between the slits 110, the liquid crystal of the portion is also weakened due to the effect of the edge electric field. The molecules do not rotate or the rotation angle is too small, thereby generating dark lines. Therefore, there are obvious bright areas and dark lines in the first slit region 401 and the third slit region 403, and the dark lines can be generated by the molecules. , to achieve the effect of reducing the liquid crystal reaction time. On the other hand, since the third virtual distance c and the fourth virtual distance d in the longitudinal slit 420 have a relationship of 2/(3W) ≦d/c ≦ (3W)/2, they are parallel to the first direction D1. The fringe electric field is strong, so that the rotation of the liquid crystal molecules located on the longitudinal slit 420 is not obvious or rotated, and therefore, a bright region cannot be generated in the second slit region 402 and the fourth slit region 404. In this embodiment, when the gap of the liquid crystal layer 30 is 3 micrometers, the liquid crystal reaction time of 25 ° C can reach about 10.5 milliseconds, and the liquid crystal efficiency is about 37%, so the pixel electrode 400 of the embodiment is compared with the conventional one. The design of the pixel electrode can achieve the effect of reducing the liquid crystal reaction time.

Please refer to FIG. 10, which is a top view of a pixel electrode according to a fifth embodiment of the present invention, wherein the slit 110 is exemplified by a strip shape. As shown in FIG. 10, the difference between the pixel electrode 500 of the present embodiment and the fourth embodiment is that the second slit region 402 and the fourth slit region 404 of the pixel electrode 500 of the present embodiment have plural numbers, respectively. There are slits 110 and no longitudinal slits 420. Since the first virtual distance a and the second virtual distance b of the slits 110 in the first slit region 401, the second slit region 402, the third slit region 403, and the fourth slit region 404 have 2/(3W) ≦a / b ≦ (3W) / 2, therefore, in the first slit region 401, the second slit region 402, the third slit region 403 and the fourth slit region 404 can be obvious The bright area and the dark lines can be used to reduce the liquid crystal reaction time by the generation of the dark lines. In addition, since both the second slit region 402 and the fourth slit region 404 can produce a bright region, the present embodiment has higher liquid crystal efficiency than the fourth embodiment. In this embodiment, when the gap of the liquid crystal layer 30 is 3 micrometers, the liquid crystal reaction time of 25 ° C can reach about 9.9 milliseconds, and the liquid crystal efficiency is about 55%, so this embodiment can have a low liquid crystal reaction time and preferably. LCD efficiency.

Referring to FIG. 11, FIG. 11 is a top view of a pixel electrode according to a variation of the fifth embodiment of the present invention, wherein the slit 110 is exemplified by an ellipse. As shown in FIG. 11, the difference between the pixel electrode 500' of the modified embodiment and the fifth embodiment lies in the first boundary 411, the second boundary 412, the third boundary 413, and the fourth boundary 414 of the present embodiment. The first boundary 411 and the third boundary 413 extend substantially in the third direction D3, and the second boundary 412 and the fourth boundary 414 extend substantially in the fourth direction D4. In the present variation, when the gap of the liquid crystal layer 30 is 3 micrometers, the liquid crystal reaction time of 25 ° C can reach about 10 msec, and the liquid crystal efficiency is about 53%, so the present variation embodiment has a low liquid crystal reaction time and Good LCD efficiency.

Referring to FIG. 12, FIG. 12 is a top view of a pixel electrode according to a sixth embodiment of the present invention, wherein the slit 110 is exemplified by a rectangle. As shown in FIG. 12, the difference between the pixel electrode 600 of the present embodiment and the fifth embodiment is that the pixel electrode 600 of the embodiment further includes a plurality of boundary slits 610 disposed on the first boundary 411, At least one of the second boundary 412, the third boundary 413, and the fourth boundary 414. In this embodiment, when the gap of the liquid crystal layer 30 is 3 micrometers, the liquid crystal reaction time of 25 ° C can reach about 11.1 milliseconds, and the liquid crystal efficiency is about 54%, so the present variation embodiment can have a low liquid crystal reaction time and Good LCD efficiency.

Referring to FIG. 13, FIG. 13 is a schematic top view of a pixel electrode according to a seventh embodiment of the present invention, wherein the slit 110 is exemplified by an octagon. As shown in FIG. 13, the pixel electrode 700 of the present embodiment includes a plurality of slits 110. The slits 110 may have different sizes, and the slits 110 have a first virtual distance a parallel to the first direction D1 and are parallel to a second virtual distance b of the second direction D2, wherein the first direction D1 is substantially non-flat in the second direction D2, and the second direction D2 is substantially perpendicular to the optical axis direction of one of the polarizers 70, and 2/(3W) ≦a/b≦(3W)/2, further, in the embodiment, the first virtual distance a is the maximum width of each slit 110 in the first direction D1, and the second virtual distance b is the slit 110 The maximum width in the second direction D2, the second virtual distance b of each slit 110 may be the same, and the first virtual distance a of each slit 110 may be different, that is, the slits 110 may have two or more types. A virtual distance a. On the other hand, the partial slits 110 are adjacent to each other along the second direction D2, and the adjacent slits 110 in the second direction D2 are mutually displaced, and in the present embodiment, the center of the slit 110 is at the The two directions D2 may not correspond to the adjacent slits 110, but not limited thereto. In the modified embodiment, the center of the slit 110 may correspond to the adjacent slits 110 in the second direction D2, but not Corresponding to the center of the adjacent slit 110. In this embodiment, when the gap of the liquid crystal layer 30 is 3 micrometers, the liquid crystal reaction time of 25 ° C can reach about 11.2 milliseconds, and the liquid crystal efficiency is about 63%, so the present embodiment can achieve the effect of reducing the liquid crystal reaction time. .

Please refer to Table 1. Table 1 is a liquid crystal efficiency of a pixel electrode, a liquid crystal reaction time of 25 ° C, and a liquid crystal reaction time of -30 ° C according to the second embodiment, the fifth embodiment, the seventh embodiment, and the comparative example of the present invention, wherein The comparative example is a pixel electrode having a slit shape but having a slit shape which does not satisfy 2/(3W)≦a/b≦(3W)/2, and the gap of the liquid crystal layer 30 of each embodiment is 2.8. Micron. As shown in Table 1, the second, fifth and seventh embodiments of the present invention have a lower liquid crystal reaction than the comparative examples, regardless of whether the liquid crystal is at a normal temperature of 25 ° C or a relatively low temperature of -30 ° C. time. In addition, since the -30 ° C liquid crystal reaction time of the embodiment of the present invention is less than 250 milliseconds, preferably less than 200 milliseconds, the image sticking problem at the time of low temperature display can be remarkably improved, thereby achieving better display quality.

Table 1         <TABLE border="1" borderColor="#000000" width="_0003"><TBODY><tr><td> </td><td> Second Embodiment </td><td> Fifth Embodiment </td><td> Seventh Embodiment </td><td> Comparative Example </td></tr><tr><td> Liquid Crystal Efficiency</td><td> 82% </td> <td> 78% </td><td> 77% </td><td> 100% </td></tr><tr><td> 25°C liquid crystal reaction time</td><td> 7.7 Milliseconds</td><td> 8.1 milliseconds</td><td> 9.3 milliseconds</td><td> 11.4 milliseconds</td></tr><tr><td> -30 °C liquid crystal reaction time</ Td><td> 173ms</td><td> 176ms</td><td> 227ms</td><td> 256ms</td></tr></TBODY></TABLE>

In summary, the pixel electrode of the present invention has a special slit pattern design, and the first virtual distance a and the second virtual distance b have a relationship of 2/(3W)≦a/b≦(3W)/2. Therefore, compared with the conventional pixel electrode, the electrode has a strong electric field parallel to the first direction, and has a short dark line distance, thereby causing a decrease in liquid crystal reaction time. 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.

10‧‧‧First substrate
20‧‧‧second substrate
30‧‧‧Liquid layer
40‧‧‧Active circuit structure layer
42‧‧‧First insulation
44‧‧‧Common electrode layer
46‧‧‧Second insulation
48‧‧‧pixel electrode layer
50‧‧‧Color filter layer
60‧‧‧ shading layer
70‧‧‧ polarizer
100, 100', 100'', 200, 200', 300, 400, 500, 500', 600, 700‧‧ ‧ pixel electrodes
110‧‧‧slit
110R‧‧‧Slit column
110U‧‧‧ unit pattern
1101‧‧‧First area
1102‧‧‧Second area
1103‧‧‧ third area
1104‧‧‧ fourth area
111‧‧‧First side
112‧‧‧Second side
113‧‧‧ third side
114‧‧‧ fourth side
115‧‧‧ fifth side
116‧‧‧ Sixth side
211‧‧‧First arc
212‧‧‧Second arc
213‧‧‧ third arc
214‧‧‧ fourth arc
401‧‧‧First slit zone
402‧‧‧Second slit zone
403‧‧‧ third slit zone
404‧‧‧4th slit zone
411‧‧‧ first border
412‧‧‧ second border
413‧‧‧ third border
414‧‧‧ fourth border
420‧‧‧ longitudinal slit
610‧‧‧Boundary Slit
A‧‧‧first virtual distance
A1, a2, α‧‧‧ angle
B‧‧‧second virtual distance
C‧‧‧third virtual distance
CP‧‧‧ Point
D‧‧‧fourth virtual distance
D1‧‧‧ first direction
D2‧‧‧ second direction
D3‧‧‧ third direction
D4‧‧‧ fourth direction
LA‧‧‧Bright District
W‧‧‧Width

FIG. 1 is a cross-sectional view showing a liquid crystal display panel according to an embodiment of the present invention. FIG. 2A is a top view showing the pixel electrode of the first embodiment of the present invention. FIG. 2B is a top view of the pixel electrode of the modified embodiment of the first embodiment of the present invention. FIG. 3 is a schematic view showing the electric field of the pixel electrode of the first embodiment of the present invention. 4 is a schematic view showing a bright region in which a pixel electrode of the first embodiment of the present invention is supplied with a driving voltage. Fig. 5 is a top plan view showing a pixel electrode of a modified embodiment of the first embodiment of the present invention. Fig. 6 is a top plan view showing a pixel electrode of a second embodiment of the present invention. Fig. 7 is a top plan view showing a pixel electrode of a modified embodiment of the second embodiment of the present invention. Fig. 8 is a top plan view showing a pixel electrode of a third embodiment of the present invention. Figure 9 is a top plan view showing a pixel electrode of a fourth embodiment of the present invention. Fig. 10 is a top plan view showing a pixel electrode of a fifth embodiment of the present invention. Figure 11 is a top plan view showing a pixel electrode of a variation of the fifth embodiment of the present invention. Fig. 12 is a top plan view showing a pixel electrode of a sixth embodiment of the present invention. Figure 13 is a top plan view showing a pixel electrode of a seventh embodiment of the present invention.

100‧‧‧ pixel electrodes

110‧‧‧slit

110R‧‧‧Slit column

110U‧‧‧ unit pattern

111‧‧‧First side

112‧‧‧Second side

113‧‧‧ third side

114‧‧‧ fourth side

115‧‧‧ fifth side

116‧‧‧ Sixth side

A‧‧‧first virtual distance

B‧‧‧second virtual distance

D1‧‧‧ first direction

D2‧‧‧ second direction

D3‧‧‧ third direction

D4‧‧‧ fourth direction

W‧‧‧Width

‧‧‧‧ angle

Claims (27)

A pixel electrode comprising a plurality of slits, and one of the slits has: a first virtual distance a parallel to a first direction; and a second virtual distance b parallel to a second direction Wherein the first direction is substantially different from the second direction, the second direction is substantially perpendicular to an optical axis direction, and 2/(3W)≦a/b≦(3W)/2, and the W is a sub-picture The width of the prime. The pixel electrode of claim 1, wherein the slit has two or more widths in the second direction. The pixel electrode of claim 2, wherein the slits respectively comprise a unit pattern, the first virtual distance a is a width of the unit pattern in the first direction, and the second virtual distance b is the The minimum width of the unit pattern in the second direction. The pixel electrode of claim 3, wherein the unit pattern has a first side, a second side, a third side, and a fourth side, the first side and the third side The side is substantially parallel to a third direction, the second side and the fourth side are substantially parallel to a fourth direction, and the first side and the fourth side correspond to each other in the second direction, the first The two sides and the third side correspond to each other in the second direction, and the first direction, the second direction, the third party, and the fourth direction are not parallel to each other. The pixel electrode of claim 4, wherein in the second direction, the first side of each of the slits is adjacent to and corresponds to the fourth side of the adjacent one of the slits. The pixel electrode of claim 4, wherein in the second direction, the first side of each of the slits is adjacent to and corresponds to the third side of the adjacent one of the slits. The pixel electrode of claim 4, wherein the unit pattern is a hexagon. The pixel electrode of claim 3, wherein the unit pattern has a first arc, a second arc, a third arc, and a fourth arc, the first arc and the fourth circle The arcs correspond to each other in the second direction, and the second arc and the third arc correspond to each other in the second direction. The pixel electrode of claim 2, wherein the slits respectively comprise a plurality of unit patterns, and the unit patterns are successively repeatedly arranged along the first direction, the first virtual distance a being each of the unit patterns a width in the first direction, and the second virtual distance b is a minimum width of each of the unit patterns in the second direction. The pixel electrode of claim 2, wherein a part of the slits are adjacent to each other along the second direction, and in the second direction, the portions of the slits having the largest width correspond to each other, and The portions of the slits having the smallest width correspond to each other. The pixel electrode of claim 2, wherein a part of the slits are adjacent to each other along the second direction, and in the second direction, adjacent portions of the slits having the largest width are mutually displaced And adjacent portions of the slits having the smallest width are offset from each other. The pixel electrode of claim 1, wherein the first virtual distance a is a maximum width of each of the slits in the first direction, and the second virtual distance b is that the slits are in the second direction. The maximum width. The pixel electrode of claim 12, further comprising a first slit region, a second slit region, a third slit region and a fourth slit region, wherein the first slit region and The third slit region has a plurality of the slits respectively, and the first slit region and the second slit region have a first boundary between the second slit region and the third slit region Having a second boundary, a third boundary between the third slit region and the fourth slit region, and a fourth boundary between the fourth slit region and the first slit region, the first A boundary and the third boundary extend in a third direction, and the second boundary and the fourth boundary extend in a fourth direction. The pixel electrode of claim 13, wherein the second slit region and the fourth slit region respectively have a plurality of longitudinal slits, one of the longitudinal slits having: a third virtual distance c, Parallel to the first direction; and a fourth virtual distance d, parallel to the second direction, and 2/(3W) ≦d/c ≦ (3W)/2. The pixel electrode of claim 13, wherein the second slit region and the fourth slit region respectively have a plurality of the slits. The pixel electrode of claim 13, further comprising a plurality of boundary slits disposed on at least one of the first boundary, the second boundary, the third boundary, and the fourth boundary. The pixel electrode of claim 13, wherein an angle between the third direction and the first direction ranges from about 0 degrees to about 90 degrees, and an angle range between the fourth direction and the first direction It is from about 0 degrees to about 90 degrees. The pixel electrode of claim 13, wherein the first boundary, the second boundary, the third boundary, and the fourth boundary are substantially X-shaped. The pixel electrode of claim 12, wherein a portion of the slits are adjacent to each other along the second direction, and adjacent slits are offset from each other in the second direction. The pixel electrode of claim 19, wherein a center of each of the slits does not correspond to the adjacent slits in the second direction. The pixel electrode of claim 12, wherein the slits have more than two of the first virtual distances a. The pixel electrode of claim 1, wherein the slits are arranged in a plurality of slit rows along the first direction, and the slit rows are parallel to each other along the second direction. The pixel electrode of claim 22, wherein the slits of the two adjacent slit columns correspond to each other in the second direction. The pixel electrode of claim 22, wherein the two adjacent slit columns are misaligned in the first direction. The pixel electrode of claim 24, wherein the two adjacent slits have a misalignment of the first virtual distance a in the first direction. The pixel electrode of claim 1, wherein the slits are respectively a polygon, and the inner corner of the polygon is a right angle or an obtuse angle. The pixel electrode of claim 1, wherein the slits are trapezoidal, rectangular, hexagonal, octagonal, elliptical or elongated.