Patent Publication Number: US-2023143881-A1

Title: Display panel

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit Taiwan application serial no. 110141948 filed on Nov. 11, 2021. The entirety of the above-mentioned patent applications are hereby incorporated by reference herein and made a part of this specification. 
     BACKGROUND 
     Field of the Disclosure 
     The invention is related to a display panel, and more particularly to a liquid crystal display panel. 
     Description of Related Art 
     The liquid crystal display device includes a backlight module and a liquid crystal display panel overlapping with the backlight module. Generally speaking, by rotating the liquid crystal molecules in the liquid crystal display panel, the light emitted by the backlight module is controlled to pass or not pass through the liquid crystal display panel, so that so that the liquid crystal display device displays a predetermined screen. 
     The brightness of the liquid crystal display device is closely related to the transmittance of the liquid crystal display panel. The higher the transmittance of the liquid crystal display panel, the higher the brightness of the liquid crystal display device, and the power consumption of the liquid crystal display device can be reduced. In order to improve the transmittance of the liquid crystal display panel, some manufacturers adjust the ingredient of the liquid crystal layer, thereby increasing the transmittance of the liquid crystal layer. However, after modifying the ingredient of the liquid crystal layer, it is usually necessary to adjust the design of other optical layers to maximize the brightness of the liquid crystal display device. Therefore, the manufacturing cost of the liquid crystal display device is greatly increased. 
     SUMMARY 
     The present invention provides a display panel with the advantages of high transmittance and low manufacturing cost. 
     At least one embodiment of the present invention provides a display panel. The display panel includes a first substrate, a second substrate, a liquid crystal layer, a pixel electrode, a common electrode, a first polarizer and a second polarizer. The second substrate is overlapping with the first substrate. The liquid crystal layer, the pixel electrode and the common electrode are located between the first substrate and the second substrate. The pixel electrode includes a trunk portion, first to fourth branch portions, and first to fourth strip portions. The trunk portion is extending along a first direction. The first branch portion and the second branch portion are connected to a first end of the trunk portion, and are extending toward a first tilt direction and a second tilt direction, respectively. The third branch portion and the fourth branch portion are connected to a second end of the trunk portion, and are extending toward a third tilt direction and fourth tilt direction, respectively. The first strip portions are connected to the first branch portion and the second branch portion, and are extending along the first direction. The second strip portions are connected to the third branch portion and the fourth branch portion, and are extending along the first direction. The third strip portions are connected to the first branch portion, the trunk portion and the third branch portion, and extend along a second direction. The second direction is perpendicular to the first direction. The fourth strip portions are connected to the second branch portion, the trunk portion, and the fourth branch portion, and extend along the second direction. The first polarizer is located on the first substrate. The second polarizer is located on the second substrate. 
     At least one embodiment of the present invention provides a display panel. The display panel includes a first substrate, a second substrate, a liquid crystal layer, a pixel electrode, a common electrode, a first polarizer and a second polarizer. The second substrate is overlapping with the first substrate. The liquid crystal layer, the pixel electrode and the common electrode are located between the first substrate and the second substrate. The pixel electrode includes a trunk portion, a branch portion, first strip portions and second strip portions. The trunk portion is extending along a first direction. The branch portion is connected to the trunk portion and is extending along a second direction, wherein the first direction is perpendicular to the second direction. The first strip portions are extending along the second direction, wherein the trunk portion are passing through the first strip portions. The second strip portions are extending along the first direction, wherein the branch portion are passing through the second strip portions. The first polarizer is located on the first substrate. The second polarizer is located on the second substrate. 
     Based on the above, by the design of the pixel electrode, the display panel has the advantage of high transmittance, and the first polarizer and the second polarizer have the advantage of low manufacturing cost. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1 A  is a schematic top view of a display panel according to an embodiment of the present invention. 
         FIG.  1 B  is a schematic cross-sectional view along the line a-a′ of  FIG.  1 A . 
         FIG.  2    is a simulation diagram of a liquid crystal effect of the display panel of  FIG.  1 A  when performing an alignment procedure on a liquid crystal layer. 
         FIG.  3    is a schematic top view of a display panel according to an embodiment of the present invention. 
         FIG.  4    is a simulation diagram of a liquid crystal effect of the display panel of  FIG.  3    when performing an alignment procedure on a liquid crystal layer. 
         FIG.  5    is a simulation diagram of a liquid crystal effect of the display panel according to an embodiment of the present invention when performing an alignment procedure on the liquid crystal layer. 
         FIG.  6 A  is a schematic top view of the display panel according to an embodiment of the present invention. 
         FIG.  6 B  is a schematic cross-sectional view along the line a-a′ of  FIG.  6 A . 
         FIG.  7    is a simulation diagram of a liquid crystal effect of the display panel of  FIG.  6 A  when performing an alignment procedure on a liquid crystal layer. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     Reference will now be made in detail to the present preferred embodiments of the disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts. 
     Various embodiments of the disclosure are disclosed in the drawings, and for the sake of clarity, many of the practical details are set forth in the following description. As used herein, “connected” refers to two elements without one or more intervening elements, ie, “directly connected.” “Electrically connected” means that the two elements may be “directly connected” or “indirectly connected”, that is, there may be one or more intervening elements between the two elements. 
     It should be understood that, although the terms “first”, “second”, etc., may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers, and/or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. 
     The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting of the disclosure. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. Herein, “or” represents “and/or”. The term “and/or” used herein includes any or a combination of one or more of the associated listed items. It will be further understood that the terms “comprises”, “comprising”, “includes” and/or “including”, when used herein, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof. 
     Moreover, relative terms such as “below” or “bottom” and “above” or “top” may serve to describe the relation between one element and another element in the text according to the illustration of the drawings. It should also be understood that the relative terms are intended to include different orientations of a device in addition to the orientation shown in the drawings. For example, if a device in the drawings is flipped, an element described as being disposed “below” other elements shall be re-orientated to be “above” other elements. Thus, the exemplary term “below” may cover the orientations of “below” and “above”, depending on a specific orientation of the drawings. Similarly, if a device in a figure is flipped over, the element originally described to be located “below” or “underneath” other element is oriented to be located “on” the other element. Therefore, the illustrative term “under” or “below” may include orientations of “above” and “under”. 
       FIG.  1 A  is a schematic top view of a display panel according to an embodiment of the present invention.  FIG.  1 B  is a schematic cross-sectional view along the line a-a′ of  FIG.  1 A . It should be noted that  FIG.  1 A  shows structure of one of sub-pixels of the display panel  10 , and the number of the sub-pixels of the display panel  10  can be adjusted according to actual needs. 
     Referring to  FIGS.  1 A and  1 B , the display panel  10  includes a first substrate  100  (not shown in  FIG.  1 A ), a second substrate  200  (not shown in  FIG.  1 A ), a liquid crystal layer  300  (not shown in  FIG.  1 A ), a pixel electrode PE, a common electrode CE (not shown in  FIG.  1 A ), a first polarizer  110  (not shown in  FIG.  1 A ), and a second polarizer  210  (not shown in  FIG.  1 A ). In this embodiment, the display panel  10  further includes an active element  120 , a scan line  130 , a data line  140 , a shielding electrode SE, a black matrix  220  and a color conversion element  230 . The active element  120 , the scan line  130 , the data line  140 , the shielding electrode SE, the black matrix  220 , the color conversion element  230 , the liquid crystal layer  300 , the pixel electrode PE and the common electrode CE are located between the first substrate  100  and the second substrate  200 . 
     The second substrate  200  is overlapping with the first substrate  100 . The material of the first substrate  100  and the second substrate  200  may include glass, quartz, organic polymer or other transparent materials. 
     The active elements  120 , the scan line  130  and the data line  140  are located above the first substrate  100 . In this embodiment, the active element  120 , the scan line  130  and the data line  140  are located between the first substrate  100  and the second substrate  200 . The active element  120  is electrically connected to the scan line  130  and the data line  140 . In this embodiment, the data line  140  is extending along a first direction E 1 , and the scan line  130  is extending along a second direction E 2 . In this embodiment, the second direction E 2  is perpendicular to the first direction E 1 . 
     The active element  120  may be any type of thin film transistor. For example, the active device  120  is a bottom gate type thin film transistor, a top gate type thin film transistor, a double gate type thin film transistor or other types of thin film transistors. In this embodiment, the active element  120  is a bottom gate type thin film transistor, but the present disclosure is not limited thereto. 
     The active device  120  includes a gate electrode  122 , a channel layer  124 , a source electrode  126  and a drain electrode  128 . The gate electrode  122  is located above the first substrate  100  and is electrically connected to the scan line  130 . The channel layer  124  is overlapping with the gate electrode  122 , and a gate insulating layer  123  is sandwiched between the channel layer  124  and the gate electrode  122 . The source electrode  126  and the drain electrode  128  are electrically connected to the channel layer  124 . The source electrode  126  is electrically connected to the data line  140 . 
     In some embodiments, based on the consideration of conductivity, the gate electrode  122 , the scan line  130 , the source electrode  126 , the drain electrode  128  and the data line  140  are generally made of metal materials, but the invention is not limited thereto. In other embodiments, other conductive materials can also be used as the gate electrode  122 , the scan line  130 , the source electrode  126 , the drain electrode  128  and the data line  140 . For example: alloys, nitrides of metal materials, oxides of metal materials, oxynitrides of metal materials or other suitable materials or stacked layers of metal materials and other conductive materials. 
     In some embodiments, the channel layer  124  is a single-layer structure or multi-layer structure, which includes amorphous silicon, polysilicon, microcrystalline silicon, single crystal silicon, organic semiconductor materials, oxide semiconductor materials (eg, indium zinc oxide, indium gallium zinc oxide or other suitable material or combination of the above materials) or other suitable material or combination of the above materials. 
     The interlayer insulating layer  150  is located above the active element  120 , the scan line  130  and the data line  140 . 
     The shielding electrode SE is located above the interlayer insulating layer  150 . In some embodiments, the shielding electrode SE is overlapping with the data line  140 , and the shielding electrode SE is used to reduce the electric field generated between the data line  140  and the pixel electrode PE, thereby improving the light leakage problem of the display device. In other embodiments, the shielding electrode SE may have other shapes, and the shielding electrode SE is not limited to the shape shown in  FIG.  1 A . 
     The pixel electrode PE is electrically connected to the drain electrode  128  of the active element  120 . In this embodiment, the pixel electrode PE is located above the interlayer insulating layer  150  and is electrically connected to the drain electrode  128  of the active device  120  through a conductive via passing through the interlayer insulating layer  150 , but the invention is not limited thereto. In other embodiments, the pixel electrode PE is directly formed on the drain electrode  128  and the gate insulating layer  123 , and is directly connected to the drain electrode  128  without any conductive vias. 
     In some embodiments, the pixel electrode PE includes a transparent conductive material, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium gallium zinc oxide, or stacked layers of at least two of the above. In this embodiment, the shielding electrode SE and the pixel electrode PE include the same material, and the shielding electrode SE and the pixel electrode PE belong to the same conductive pattern layer, but the invention is not limited thereto. In other embodiments, the shielding electrode SE and the pixel electrode PE include different materials, and the shielding electrode SE and the pixel electrode PE belong to different conductive pattern layers. 
     In this embodiment, the pixel electrode PE includes a trunk portion TP, a first branch portion BP 1 , a second branch portion BP 2 , a third branch portion BP 3 , a fourth branch portion BP 4 , first strip portions SP 1 , second strip portions SP 2 , third strip portions SP 3 , and fourth strip portions SP 4 . For the convenience of description,  FIG.  1 A  shows the boundaries between the trunk portion TP, the first branch portion BP 1 , the second branch portion BP 2 , the third branch portion BP 3 , the fourth branch portion BP 4 , the first strip portions SP 1 , the second strip portions SP 2 , the third strip portions SP 3 , and the fourth strip portions SP 4 . However, in reality, the trunk portion TP, the first branch portion BP 1 , the second branch portion BP 2 , the third branch portion BP 3 , the fourth branch portion BP 4 , the first strip portions SP 1 , the second strip portions SP 2 , the third strip portions SP 3 , and the fourth strip portions SP 4 . are integrally connected. 
     The trunk portion TP is extending along the first direction E 1 . In some embodiments, the width W 1  of the trunk portion TP is 4 micrometers to 8 micrometers. 
     The first branch portion BP 1  and the second branch BP 2  are connected to the first end of the trunk portion TP. The first branch portion BP 1  and the second branch portion BP 2  respectively extend toward the first tilt direction OE 1  and the second tilt direction OE 2  from the first end of the trunk portion TP. 
     The third branch portion BP 3  and the fourth branch portion BP 4  are connected to the second end of the trunk portion TP. The third branch portion BP 3  and the fourth branch portion BP 4  extend toward the third tilt direction OE 3  and the fourth tilt direction OE 4  from the second end of the trunk portion TP, respectively. 
     In some embodiments, the width W 2  of each of the first branch portion BP 1 , the second branch portion BP 2 , the third branch portion BP 3 , and the fourth branch portion BP 4  is less than or equal to the width W 1  of the trunk portion TP. In some embodiments, the width W 2  of each of the first branch portion BP 1 , the second branch portion BP 2 , the third branch portion BP 3  and the fourth branch portion BP 4  is 2 micrometers to 8 micrometers. 
     In some embodiments, the angle between the first direction E 1  and the first tilt direction OE 1  and the angle between the first direction E 1  and the second tilt direction OE 2  are 35 degrees to 55 degrees. In some embodiments, the angle between the first direction E 1  and the third tilt direction OE 3  and the angle between the first direction E 1  and the fourth tilt direction OE 4  are 125 degrees to 145 degrees. 
     The plurality of first strip portions SP 1  are connected to the first branch portion BP 1  and the second branch portion BP 2 , and are extending along the first direction E 1 . The plurality of second strip portions SP 2  are connected to the third branch portion BP 3  and the fourth branch portion BP 4 , and are extending along the first direction E 1 . In this embodiment, one of the first strip portions SP 1  and one of the second strip portions SP 2  are connected to and aligned with the trunk portion TP, but the invention is not limited thereto. 
     The plurality of third strip portions SP 3  are connected to the first branch portion BP 1 , the trunk portion TP, and the third branch portion BP 3 , and are extending along the second direction E 2 . The plurality of fourth strip portions SP 4  are connected to the second branch portion BP 2 , the trunk portion TP, and the fourth branch portion BP 4 , and are extending along the second direction E 2 . 
     In some embodiments, the width W 3  of each of the first strip portions SP 1 , the second strip portions SP 2 , the third strip portions SP 3  and the fourth strip portions SP 4  is smaller than the width W 1  of the trunk portion TP. In some embodiments, the width W 3  of each of the first strip portions SP 1 , the second strip portions SP 2 , the third strip portions SP 3  and the fourth strip portions SP 4  is 1 micrometer to 4 micrometers. 
     In some embodiments, there are a plurality of first slits st 1  between the first strip portions SP 1 , a plurality of second slits st 2  between the second strip portions SP 2 , a plurality of third slits st 3  between the third strip portions SP 3 , and a plurality of fourth slits st 4  between the fourth strip portions SP 4 . The first slits st 1  and the second slits st 2  are extending along the first direction E 1 , and the third slits st 3  and the fourth slits st 4  are extending along the second direction E 2 . 
     In some embodiments, the width W 4  of each of the first slits st 1 , the second slits st 2 , the third slits st 3  and the fourth slits st 4  are 1 micrometer to 4 micrometers. In some embodiments, the first slits st 1 , the second slits st 2 , the third slits st 3 , and the fourth slits st 4  have the same or different width(s). 
     In this embodiment, the first strip portions SP 1  and the second strip portions SP 2  are symmetrically arranged on two sides of the trunk portion TP (for example, top side and bottom side in  FIG.  1 A ), and the first slits st 1  and the second slits st 2  are symmetrically arranged on the two sides of the trunk portion TP (for example, top side and bottom side in  FIG.  1 A ). In this embodiment, the third strip portions SP 3  and the fourth strip portions SP 4  are symmetrically arranged on two sides of the trunk portion TP (for example, the left side and right side in  FIG.  1 A ), and the third slits st 3  and the fourth slits st 4  are symmetrically arranged on the two sides of the trunk portion TP (for example, the left and right sides in  FIG.  1 A ). 
     In this embodiment, the first strip portion(s) SP 1  of the pixel electrode PE is(are) connected to the drain electrode  128  of the active element  120 , but the invention is not limited thereto. In other embodiments, other portion(s) of the pixel electrode PE is(are) connected to the drain electrode  128  of the active element  120 . For example, the second strip portions SP 2 , the third strip portions SP 3  or the fourth strip portions SP 4  of the pixel electrode PE are connected to the drain electrode  128  of the active element  120 . 
     The liquid crystal layer  300  is located above the pixel electrode PE. The liquid crystal layer  300  is located between the first alignment film AL 1  and the second alignment film AL 2 . In this embodiment, the display panel  10  is a vertical alignment (VA) type liquid crystal display panel. The liquid crystal molecules in the liquid crystal layer  300  are vertically aligned when no voltage is applied, while the display panel  10  is in a dark state. After a voltage is applied to the liquid crystal molecules in the liquid crystal layer  300 , the liquid crystal molecules in the liquid crystal layer  300  are overturned, while the display panel  10  is in a bright state. In this embodiment, the liquid crystal layer  300  includes a chiral dopant. The chiral dopant enables the liquid crystal molecules in the liquid crystal layer  300  to be arranged in a helical shape along a clockwise direction or counterclockwise direction in the bright state, and stacked between the first alignment film AL 1  and the second alignment film AL 2 . Therefore, the chiral dopant can reduce the opaque dark area in the pixels, thereby increasing the transmittance of the pixels. 
     The black matrix  220  is overlapping with the active element  120 , the scan line  130  and the data line  140 . The color conversion element  230  is overlapping to the pixel electrode PE. In some embodiments, the color conversion element  230  includes a color filter element, but the invention is not limited thereto. 
     In this embodiment, the black matrix  220  and the color conversion element  230  are located on the second substrate  200 , but the invention is not limited thereto. In other embodiments, the black matrix  220  is located on the first substrate  100  to form a black matrix on array (BOA) structure. In other embodiments, the color conversion element  230  is located on the first substrate  100  to form a color filter on array (COA) structure. 
     The common electrode CE is located on the second substrate  200 . In this embodiment, the common electrode CE is located on the black matrix  220  and the color conversion element  230 . The common electrode CE includes a transparent conductive material, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium gallium zinc oxide, or stacked layers of at least two of the above. 
     The first polarizer  110  is located on the first substrate  100 . The second polarizer  210  is located on the second substrate  200 . In this embodiment, the polarizing direction  112  of the first polarizer  110  is parallel to the first direction E 1  or the second direction E 2 , and the polarizing direction  212  of the second polarizer  210  is perpendicular to the polarizing direction  112  of the first polarizer  110 . In this embodiment, the polarizing direction  112  of the first polarizer  110  is parallel to the first direction E 1 , and the polarizing direction  212  of the second polarizer  210  is parallel to the second direction E 2 . In other embodiments, the polarizing direction  112  of the first polarizer  110  is parallel to the second direction E 2 , and the polarizing direction  212  of the second polarizer  210  is parallel to the first direction E 1 . 
     Generally, the polarizing direction of a polarizer will affect the transmittance of the display panel. Therefore, the polarizer has the polarizing direction that can make the display panel have better transmittance. The polarizing direction of the polarizer is generally parallel to the extension direction (e.g., the first direction E 1 ) of the data lines or the extension direction (e.g., the second direction E 2 ) of the scan lines of the display panel. If a polarizer with a polarizing direction that is not parallel to the extending direction of the data lines or the extending direction of the scan lines is used to be disposed in the display panel, the manufacturing cost of the display panel will be greatly increased. 
     In some embodiments, the liquid crystal layer  300  may be doped with chiral dopants to change the preferred polarizing direction (the polarizing direction that can make the display panel have better transmittance), resulting in the need to replace the polarizer(s) in the display panel with other polarizer(s) having different polarizing direction(s). In the present embodiment, through the design of the pixel electrode PE, a common polarizer (that is, a polarizer whose polarizing direction is parallel to the extension direction of the data lines or the extension direction of the scan lines) can be used to make the display panel  10  have the advantage of high transmittance. As such, the manufacturing cost of the display panel  10  can be reduced. 
       FIG.  2    is a simulation diagram of a liquid crystal effect of the display panel of  FIG.  1 A  when performing an alignment procedure on a liquid crystal layer. 
     Referring to  FIG.  2   , a position corresponding to the trunk portion TP of the pixel electrode PE has defect points DP. For example, the defect points DP appear at the positions where the dark lines intersect. In this embodiment, three defect points DP appear at the position of the trunk portion TP. 
       FIG.  3    is a schematic top view of a display panel according to an embodiment of the present invention. It should be noted herein that, in embodiments provided in  FIG.  3   , element numerals and partial content of the embodiments provided in  FIG.  1 A  and  FIG.  1 B  are followed, the same or similar reference numerals being used to represent the same or similar elements, and description of the same technical content being omitted. For a description of an omitted part, reference may be made to the foregoing embodiment, and the descriptions thereof are omitted herein. 
     The difference between the display panel  20  of  FIG.  3    and the display panel  10  of  FIG.  1    is that the trunk portion TP of the pixel electrode PEa of the display panel  20  has a fifth slit st 5  and a sixth slit st 6  extending along the first direction E 1 . The fifth slit st 5  extends inward from the first end of the trunk portion TP, and the sixth slit st 5  extends inward from the second end of the trunk portion TP. The fifth slit st 5  and the sixth slit st 6  are aligned with the center of the trunk portion TP in the first direction E 1 . 
     Referring to  FIG.  3   , the distance L 1  between the fifth slit st 5  and the sixth slit st 6  is 5% to 20% of the length L 2  of the trunk portion TP. In some embodiments, the distance L 1  between the fifth slit st 5  and the sixth slit st 6  is 27 micrometers, and the length L 2  of the trunk portion TP is 62 micrometers. 
     In this embodiment, the width W 5  of the fifth slit st 5  is smaller than the width W 4 ′ of the first slit st 1 ′ between the two first strip portions SP 1  adjacent to the fifth slit st 5  (i.e., the first slit st 1 ′ aligned with the trunk portion TP). In this embodiment, the width W 5  of the sixth slit st 6  is smaller than the width W 4 ′ of the second slit st 2 ′ between the two second strip portions SP 2  adjacent to the sixth slit st 6  (i.e., the second slit st 2 ′ aligned with the trunk portion TP). In some embodiments, the width W 5  of each of the fifth slit st 5  and the sixth slit st 6  are between 2 micrometers and 5 micrometers. 
     In some embodiments, the first slits, the second slits, the third slits, and the fourth slits have different widths. For example, in this embodiment, the width W 4 ′ of the first slit st 1 ′ located on the outermost side (the left and right sides in  FIG.  3   ) and the first slit st 1 ′ aligned with the trunk portion TP is greater than or equal to the width W 4  of the other first slits st 1 . Similarly, in this embodiment, the width W 4 ′ of the second slit st 2 ′ located at the outermost side (the left and right sides in  FIG.  3   ) and the second slit st 2 ′ aligned with the trunk portion TP is greater than or equal to the width W 4  of the other second slit st 2 . 
     In this embodiment, through the design of the pixel electrode PEa, a common polarizer (that is, a polarizer whose polarizing direction is parallel to the extending direction of the data line or the extending direction of the scanning line) can be used to make the display panel  20  have the advantage of high transmittance. As such, the manufacturing cost of the display panel  20  can be reduced. 
       FIG.  4    is a simulation diagram of a liquid crystal effect of the display panel of  FIG.  3    when performing an alignment procedure on a liquid crystal layer. 
     Referring to  FIG.  3    and  FIG.  4   , a position corresponding to the trunk portion TP of the pixel electrode PEa has a defect point DP. In this embodiment, only one defect point DP appears at the position of the trunk portion TP. 
     Based on the above, the fifth slit st 5  and the sixth slit st 6  can reduce the number of defect point DP, thereby improving the influence of the defect point DP on the displayed screen. 
       FIG.  5    is a simulation diagram of a liquid crystal effect of the display panel according to an embodiment of the present invention when performing an alignment procedure on the liquid crystal layer. 
     The difference between the display panel of  FIG.  5    and the display panel  20  of  FIG.  4    is that the distance L 1  between the fifth slit st 5  and the sixth slit st 6  is further reduced in the embodiment of  FIG.  5   . 
     Referring to  FIG.  5   , the distance L 1  between the fifth slit st 5  and the sixth slit st 6  is 7 micrometers, and the length L 2  of the trunk portion TP is 62 micrometers. 
     Referring to  FIG.  5   , a position corresponding to the trunk portion TP of the pixel electrode PEb has a defect point DP. In this embodiment, only one defect point DP appears at the position of the trunk portion. 
     Based on the above, the fifth slit st 5  and the sixth slit st 6  can reduce the number of defect point DP, thereby improving the influence of the defective point DP on the displayed screen. 
       FIG.  6 A  is a schematic top view of a display panel according to an embodiment of the present invention.  FIG.  6 B  is a schematic cross-sectional view along line a-a′ of  FIG.  6 A . It should be noted herein that, in embodiments provided in  FIG.  6 A  and  FIG.  6 B , element numerals and partial content of the embodiments provided in  FIG.  1 A  and  FIG.  1 B  are followed, the same or similar reference numerals being used to represent the same or similar elements, and description of the same technical content being omitted. For a description of an omitted part, reference may be made to the foregoing embodiment, and the descriptions thereof are omitted herein. 
     The difference between the display panel  30  of  FIGS.  6 A and  6 B  and the display panel  10  of  FIGS.  1 A and  1 B  is that the pixel electrodes PEc of the display panel  30  and the pixel electrodes PE of the display panel  10  have different shapes. 
     Referring to  FIGS.  6 A and  6 B , the display panel  30  includes a first substrate  100 , a second substrate  200 , a liquid crystal layer  300 , a pixel electrode PEc, a common electrode CE, a first polarizer  110  and a second polarizer  210 . In this embodiment, the display panel  30  further includes an active element  120 , a scan line  130 , a data line  140 , a shielding electrode SE, a black matrix  220  and a color conversion element  230 . The active element  120 , the scan line  130 , the data line  140 , the shielding electrode SE, the black matrix  220 , the color conversion element  230 , the liquid crystal layer  300 , the pixel electrode PEc and the common electrode CE are located between the first substrate  100  and the second substrate  200 . 
     In this embodiment, the display panel  30  is a vertical alignment (VA) type liquid crystal display panel. In this embodiment, the liquid crystal layer  300  includes a chiral dopant. 
     In this embodiment, the pixel electrode PEc includes a trunk portion TP, a branch portion BP, first strip portions SP 1  and second strip portions SP 2 . The trunk portion TP, the branch portion BP, the first strip portions SP 1 , and the second strip portions SP 2  are integrally connected. 
     The trunk portion TP is extending along the first direction E 1 . In some embodiments, the width W 1  of the trunk portion TP is 2 micrometers to 8 micrometers. 
     The branch portion BP is connected to the trunk portion TP and is extending along the second direction E 2 , wherein the first direction E 1  is perpendicular to the second direction E 2 . In some embodiments, the width W 2  of the branch portion BP is 2 micrometers to 8 micrometers. 
     The first strip portions SP 1  are extending along the second direction E 2 , wherein the trunk portion TP penetrates through the first strip portions SP 1 . In this embodiment, the trunk portion TP penetrates through the centers of the first strip portions SP 1 , so that each of the first strip portions SP 1  includes a first portion P 1  and a second portion P 2  symmetrically disposed on two sides of the trunk portion TP. In this embodiment, the trunk portion TP penetrates through the center of the branch portion BP, so that the branch portion BP includes a first portion P 1 ′ and a second portion P 2 ′ symmetrically disposed on the two sides of the trunk portion TP. 
     The second strip portions SP 2  are extending along the first direction E 1 , wherein the branch portion BP penetrates through the second strip portions SP 2 . In this embodiment, the branch portion BP penetrates through the centers of the second strip portions SP 2 , so that each of the second strip portions SP 2  includes a first portion P 3  and a second portion P 4  symmetrically disposed on two sides of the branch portion BP. 
     In some embodiments, the width W 3  of each of the first strip portions SP 1  and the second strip portions SP 2  is 1 micrometer to 4 micrometers. 
     In some embodiments, there are a plurality of first slits st 1  between the first strip portions SP 1 , and a plurality of second slits st 2  between the second strip portions SP 2 . The first slits st 1  are disposed on the two sides of the trunk portion TP, and the second slits st 2  are disposed on the two sides of the branch portion BP. In this embodiment, the first slits st 1  are symmetrically disposed on the two sides of the trunk portion TP, and the second slits st 2  are symmetrically disposed on the two sides of the branch portion BP. 
     In some embodiments, the width W 4  of each of the first slits st 1  and the second slits st 2  is 1 micrometer to 4 micrometers. 
     In this embodiment, through the design of the pixel electrode PEc, a common polarizer (that is, a polarizer whose polarizing direction is parallel to the extension direction of the data line or the extension direction of the scan line) can be used to make the display panel  30  have the advantage of high transmittance. As such, the manufacturing cost of the display panel  30  can be reduced. 
       FIG.  7    is a simulation diagram of a liquid crystal effect of the display panel of  FIG.  6 A  when performing an alignment procedure on a liquid crystal layer. 
     Referring to  FIG.  7   , a position corresponding to the trunk portion of the pixel electrode PEc has defect points DP, for example, the defect points DP appear at positions where dark lines intersect. In this embodiment, two defect points DP appear at the position of the trunk portion.