Patent Publication Number: US-2007109486-A1

Title: Liquid crystal display panel

Description:
CROSS-REFERENCE TO RELATED APPLICATION  
      This application claims the priority benefit of Taiwan application serial no. 94140038, filed on Nov. 15, 2005. All disclosure of the Taiwan application is incorporated herein by reference.  
     BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      The present invention generally relates to a liquid crystal display (LCD) panel, and more particularly, to an LCD panel for preventing particles accompanying liquid crystal molecules from entering a liquid crystal layer thereof through a liquid crystal injection inlet.  
      2. Description of Related Art  
      With the advantages of high image quality, small volume, low driving voltage, low power consumption and a wide range of application, the liquid crystal display (LCD) panel has been broadly applied in consumer products to replace the conventional cathode ray tube (CRT) and become the mainstream on the market. The application of the liquid crystal display includes medium- and small-size portable television, cellular phone, camcorder, notebook computer, desktop computer, projection-type television and other computer products.  
      The LCD panel is composed of two matrix substrates and a liquid crystal layer interposed therebetween. Generally speaking, the liquid crystal injection process is that placing a display panel having a liquid crystal injection inlet in a chamber first, and then the chamber is pumped to vacuum. In the next step, the display panel is submerged in a container of liquid crystal, and then the chamber is pumped up to the atmospheric pressure such that liquid crystals are filled between the two substrates through the liquid crystal injection inlet by the external pressure.  
       FIG. 1  is a schematic, three-dimensional diagram showing a conventional liquid crystal injection process of a display panel. Referring to  FIG. 1 , the display panel  100 , a liquid crystal layer is not formed therein, comprises a thin film transistor array substrate  112 , a color filter substrate  114  and a sealant  116 . The sealant  116  is formed between the thin film transistor array substrate  112  and the color filter substrate  114 , and has a liquid crystal injection inlet  10 .  
      More particularly, during the liquid crystal injection process, the liquid crystals within the container  100  are pressured and injected between the thin film transistor array substrate  112  and the color filter substrate  114  by the principle of capillarity. It should be noted that the liquid crystals injected from the liquid crystal injection inlet  10  and filled between the thin film transistor array substrate  112  and the color filter substrate  114  may be mixed up with conductive particles P. These conductive particles P may cause the abnormal electrical connection between the pixel electrodes (not shown herein) of the thin film transistor array substrate  112  and the common electrodes (not shown herein) of the color filter substrate  114 . In other words, these conductive particles P may possibly cause inefficient control of the liquid crystals. Accordingly, after the liquid crystal injection process is completed, the display panel  110  may have defects such as white spots or black spots during operation.  
      When the cell gap between the thin film transistor array substrate  112  and the color filter substrate  114  becomes smaller, the occurrence of the abnormal electrical connection between the pixel electrode (not shown herein) of the thin film transistor array substrate  112  and the common electrode (not shown herein) of the color filter substrate  114  due to the conductive particles P accompanying the liquid crystals becomes more frequently. If the liquid crystals from the liquid crystal injection inlet  10  are accompanied by excess conductive particles P during the liquid crystal injection process, a lower display quality and fabrication yield might be brought about.  
     SUMMARY OF THE INVENTION  
      Accordingly, one objective of the present invention is to provide a liquid crystal display (LCD) panel for preventing particles from entering a space between two substrates through a liquid crystal injection inlet during a liquid crystal injection process.  
      Another objective of the present invention is to provide an LCD panel of higher fabrication yield.  
      As embodied and broadly described herein, the present invention provides an LCD panel comprising an active matrix substrate, an opposite substrate, a first sealant, a liquid crystal layer, an upper particle barrier and a second sealant. The opposite substrate is disposed above the active matrix substrate. The first sealant is disposed between the active matrix substrate and the opposite substrate, and has a liquid crystal injection inlet. Additionally, the liquid crystal layer is interposed between the active matrix substrate and the opposite substrate. The upper particle barrier is formed on the opposite substrate and adjacent to the liquid crystal injection inlet. Furthermore, the second sealant is adjacent to the liquid crystal injection inlet, and the liquid crystal layer is sealed between the active matrix substrate and the opposite substrate by the first sealant and the second sealant.  
      According to an embodiment of the present invention, the LCD panel may further comprise a lower particle barrier formed on the active matrix substrate and adjacent to the liquid crystal injection inlet.  
      According to an embodiment of the present invention, the lower particle barrier comprises a dielectric layer and an organic material layer. The dielectric layer is disposed on the active matrix substrate. The organic material layer is disposed on the dielectric layer and has a plurality of concave portions to expose a portion of the dielectric layer.  
      According to an embodiment of the present invention, the lower particle barrier comprises a dielectric layer and a plurality of organic bumps. The dielectric layer is disposed on the active matrix substrate. The organic bumps are disposed on the dielectric layer.  
      According to an embodiment of the present invention, the lower particle barrier comprises a dielectric layer and a plurality of organic bumps. The dielectric layer has a plurality of successive concaves and convexes, and is disposed on the active matrix substrate. The organic bumps are disposed on the convexes of the dielectric layer.  
      According to an embodiment of the present invention, the lower particle barrier comprises a plurality of dielectric bumps and a plurality of organic bumps. The dielectric bumps are disposed on the active matrix substrate. The organic bumps are disposed on the dielectric bumps, respectively.  
      According to an embodiment of the present invention, the opposite substrate comprises a color filter substrate. More particularly, the color filter substrate comprises a substrate, a black matrix and a plurality of color filters. The black matrix is disposed on the substrate, and has a plurality of lattices. The color filters are disposed on the substrate and within the lattices, respectively.  
      According to an embodiment of the present invention, the upper particle barrier and the black matrix are made of the same materials.  
      According to an embodiment of the present invention, the upper particle barrier and the color filters are made of the same material.  
      According to an embodiment of the present invention, except for the substrate, the black matrix and the color filters, the opposite substrate may further comprise an over-coating layer formed on the black matrix and the color filters.  
      According to an embodiment of the present invention, the upper particle barrier and the over-coating layer are made of the same material.  
      According to an embodiment of the present invention, the opposite substrate may further comprise at least one black matrix and a plurality of color filters. The black matrix is disposed on a periphery of the opposite substrate and substantially surrounded by the first sealant. The color filters are disposed on the opposite substrate and substantially surrounded by the black matrix.  
      According to an embodiment of the present invention, the upper particle barrier and the black matrix are made of the same materials.  
      According to an embodiment of the present invention, the upper particle barrier and the color filters are made of the same material.  
      According to an embodiment of the present invention, the opposite substrate may further comprise an over-coating layer formed on the black matrix and the color filters. The upper particle barrier and the over-coating layer are made of the same material.  
      As embodied and broadly described herein, the present invention also provides an LCD panel comprising an active matrix substrate, an opposite substrate, a first sealant, a liquid crystal layer, a lower particle barrier and a second sealant. The active matrix substrate has an organic layer formed thereon. The opposite substrate is disposed above the active matrix substrate. Additionally, the opposite substrate is disposed above the active matrix substrate. The first sealant is disposed between the active matrix substrate and the opposite substrate, and has a liquid crystal injection inlet. Furthermore, the liquid crystal layer is interposed between the active matrix substrate and the opposite substrate. The lower particle barrier is disposed on the active matrix substrate and adjacent to the liquid crystal injection inlet, and the lower particle barrier and the organic layer are made of the same material. The second sealant is adjacent to the liquid crystal injection inlet, and the liquid crystal layer is sealed by the first sealant and the second sealant between the active matrix substrate and the opposite substrate.  
      According to an embodiment of the present invention, the lower particle barrier comprises a passivation layer and an organic material layer. The passivation layer is formed on the active matrix substrate. The organic material layer covers the passivation layer and has a plurality of concave portions.  
      According to an embodiment of the present invention, the lower particle barrier comprises a passivation layer and a plurality of organic bumps. The passivation layer is disposed on the active matrix substrate. The organic bumps are disposed on the passivation layer.  
      According to an embodiment of the present invention, the lower particle barrier comprises a passivation layer and a plurality of organic bumps. The passivation layer has a plurality of successive concaves and convexes, and is disposed on the active matrix substrate. The organic bumps are disposed on the convexes of the passivation layer.  
      According to an embodiment of the present invention, the lower particle barrier comprises a plurality of passivation bumps and a plurality of organic bumps. The passivation bumps are disposed on the active matrix substrate. The organic bumps are disposed on the passivation bumps, respectively.  
      According to an embodiment of the present invention, the organic layer comprises a passivation layer and an organic material layer. The organic material layer covers the passivation layer.  
      According to an embodiment of the present invention, the active matrix substrate further comprises a pixel electrode disposed between the passivation layer and the organic material layer.  
      According to an embodiment of the present invention, the active matrix substrate further comprises a pixel electrode disposed on the organic material layer.  
      In summary, the LCD panel of the present invention utilizes the arrangement of the upper particle barrier and/or lower particle barrier disposed at the liquid crystal injection inlet to prevent the particles accompanying the liquid crystals from entering the LCD panel through the liquid crystal injection inlet during the liquid crystal injection process. Accordingly, the fabrication yield and the display quality of the LCD panel are enhanced. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.  
       FIG. 1  is a schematic and three-dimensional diagram showing a conventional liquid crystal injection process of a display panel.  
       FIG. 2  is a schematic diagram showing an LCD panel according to a first embodiment of the present invention.  
       FIG. 2A  is a schematic diagram showing an opposite substrate according to another embodiment of the present invention.  
       FIG. 3  is a schematic and cross-sectional view along the line A-A′ of the LCD panel illustrated in  FIG. 2 .  
       FIG. 3A  is a schematic and cross-sectional view along the line B-B′ of the opposite substrate illustrated in  FIG. 2A .  
       FIG. 4A  is a schematic diagram showing an active matrix substrate and an opposite substrate having concave portions according to the first embodiment of the present invention.  
       FIG. 4B  is a schematic diagram showing an active matrix substrate and an opposite substrate having concave portions according to the first embodiment of the present invention.  
       FIG. 4C  is a schematic diagram showing an active matrix substrate and an opposite substrate having concave portions according to the first embodiment of the present invention.  
       FIG. 5  is a schematic diagram showing the arrangement of an upper particle barrier.  
       FIG. 6A  is a schematic cross-sectional view showing an LCD panel according to a second embodiment of the present invention.  
      FIGS.  6 B˜ 6 D are schematic diagrams showing an active matrix substrate and an opposite substrate having concave portions with different depths according to the second embodiment of the present invention.  
       FIG. 7A  is a schematic cross-sectional view showing an LCD panel according to a third embodiment of the present invention.  
      FIGS.  7 B˜ 7 D are schematic diagrams showing an active matrix substrate and an opposite substrate having concave portions with different depths according to the third embodiment of the present invention.  
       FIG. 8  is a schematic diagram showing an LCD panel according to one embodiment of the present invention. 
    
    
     DESCRIPTION OF THE EMBODIMENTS  
      Reference will now be made in detail to the present preferred embodiments of the invention, 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.  
     First Embodiment  
       FIG. 2  is a schematic diagram showing an LCD panel according to a first embodiment of the present invention.  FIG. 3  is a schematic and cross-sectional view along the line A-A′ of the LCD panel illustrated in  FIG. 2 . Referring to  FIGS. 2 and 3 , an LCD panel  200  of the present invention comprises an active matrix substrate  210 , an opposite substrate  220 , a first sealant  230 , a liquid crystal layer  240 , an upper particle barrier  222  and a second sealant  250 . Generally speaking, the active matrix substrate  210  comprises a substrate  211 , a plurality of scan lines (not shown herein) and a plurality of data lines (not shown herein) on the substrate  211 , a plurality of thin film transistors (not shown herein), a passivation layer  214  covering the thin film transistors and a pixel electrode  216  electrically connected to the thin film transistor. Additionally, an organic layer (not shown herein) can be selectively disposed on the pixel electrode  216  or between the passivation layer  214  and the pixel electrode  216  so that it is adapted for different kinds of LCD panels such as the transmissive LCD, the reflective LCD or the transflective LCD.  
      Referring to  FIG. 3 , it is clear that the opposite substrate  220  is disposed above the active matrix substrate  210 , and the opposite substrate  220  can be a color filter substrate  220 ′. More specifically, the color filter substrate  220 ′ comprises a substrate  221 , a black matrix  224  and a plurality of color filters  226 . The black matrix  224  is disposed on the substrate  221  and is adapted for defining a plurality of lattices D. The color filters  226  are disposed on the substrate  221  and within the lattices D, respectively. The color filters  226  can be made of red resin, blue resin or green resin. The black matrix  224  can be made of alternatively stacked red resin, blue resin and green resin, or a material which is not pervious to light such as metal (Cr), resin or composite films of metal and resin. Generally, the opposite substrate  220  further comprises a common electrode  228  disposed on the black matrix  224  and the color filters  226 .  
      As shown in  FIG. 3 , the first sealant  230  is disposed between the active matrix substrate  210  and the opposite substrate  220 , and the LCD panel  200  further includes a liquid crystal injection inlet  20 . More particularly, a space G for containing the liquid crystals is defined by the first sealant  230 , the active matrix substrate  210  and the opposite substrate  220 , and the liquid crystals are injected into the space G in order to form a liquid crystal layer  240 . In other words, the liquid crystal layer  240  is interposed between the pixel electrode  216  of the active matrix substrate  210  and the common electrode  228  of the opposite substrate  220 .  
      It should be noted that the upper particle barrier  222  is formed on the opposite substrate  220  and adjacent to the liquid crystal injection inlet  20 . Referring  FIG. 3 , it is clear that the upper particle barrier  222  at least includes one concave portion C such that the substrate  221  of the opposite substrate  220  is exposed by the concave portion C of the upper particle barrier  222 .  
      Additionally, the second sealant  250  is disposed adjacent to the liquid crystal injection inlet  20 , and the liquid crystal layer  240  is sealed between the active matrix substrate  210  and the opposite substrate  220  by the first sealant  230  and the second sealant  250 . In this embodiment, a material of the first sealant  230  and the second sealant  250  comprises a thermal curing compound or an UV curing compound. A material of the upper particle barrier  222  can be the same as that of the black matrix  224  or color filters  226 . In other words, the upper particle barrier  222  and the black matrix  224  or the color filters  226  can be fabricated at the same time.  
      In one embodiment of the present invention, the opposite substrate  220  may further comprise an over-coating layer  225  formed on the black matrix  224  and the color filters  226 , and the common electrode  228  is disposed on the over-coating layer  225 . It should be noted that the upper particle barrier  222 , the black matrix  224 , and the color filters  226  or the over-coating layer  225  can use the same materials. In other words, the upper particle barrier  222  and the black matrix  224 , the color filters  226  or the over-coating layer  225  can be fabricated at the same time.  
      Referring to  FIGS. 2A and 3A , another embodiment of the present invention, a black matrix  224   a  can be disposed on the periphery of the opposite substrate  220  and substantially surrounded by the first sealant  230 . The black matrix  224   a  adjacent to the first sealant  230  is adapted for preventing light leakage of the LCD panel  200  during operation. Additionally, a plurality of color filters  226  (as shown in  FIG. 3A ) are disposed on the opposite substrate  220  and within the region defined by the black matrix  224   a . It should be noted that a material of the upper particle barrier  222 , the black matrix  224   a  or the color filters  226  can use the same materials. Referring to  FIG. 3A , it is clear that the opposite substrate  220  of the present invention further comprises an over-coating layer  225  formed on the black matrix  224   a  and the color filters  226 , and the common electrode  228  covering the over-coating layer  225 .  
      The method of forming the liquid crystal layer  240  in the LCD panel  200  is to place the LCD panel  200 , in which the liquid crystals are not injected and the liquid crystal injection inlet  20  thereof is not sealed (i.e. the second sealant  250  is not formed), in a chamber (not shown herein). In the following step, the chamber is pumped to neat vacuum and, then the LCD panel  200 , in which the liquid crystal layer  240  is not formed and the liquid crystal injection inlet  20  is not sealed, is immersed in the liquid crystals LC within the chamber. In the next step, the chamber is pumped up to the atmospheric pressure such that the liquid crystals are pressured and injected into the space G by the principle of capillarity, to form the liquid crystal layer  240 .  
       FIG. 4A  is a schematic diagram showing an active matrix substrate and an opposite substrate having concave portions according to the first embodiment of the present invention. Referring to  FIG. 4A , before the liquid crystals are injected into the space G, the liquid crystal injection inlet  20  is not sealed by the second sealant  250  (as shown in  FIG. 3 ), but the liquid crystals are not injected into the space G through the liquid crystal injection inlet  20 . When the liquid crystals flow through the liquid crystal injection inlet  20 , the upper particle barrier  222  could produce a turbulent flow. The upper particle barrier  222  can stop the particles P accompanying the liquid crystals LC from entering the space G. After the liquid crystal injection process is completed, the liquid crystal injection inlet  20  is sealed by the second sealant  250 .  
      Referring to  FIG. 4A , it is clear that the upper particle barrier  222  includes a plurality of columns C 1 , and the upper particle barrier  222  may have other shapes as required. In another embodiment of the present invention, the upper particle barrier  222  may have a plurality of grooves C 2  (as shown in  FIG. 4B ). Additionally, the upper particle barrier  222  may comprise the combination of the columns C 1  and the grooves C 2  (as shown in  FIG. 4C ). The shape of the upper particle barrier  222  is not limited in the present invention.  
      It should be noted that the height H of the upper particle barrier  222  can be adjusted in accordance with the size of the liquid crystals or the gap between the active matrix substrate  210  and the opposite substrate  220 , such that the liquid crystals can be injected into the space G smoothly and the particles P can be stopped by the upper particle barrier  222 . Compared with the prior art, the arrangement of the upper particle barrier  222  can prevent the particles P from entering the space G and being disposed on the display region (not shown herein) near the liquid crystal injection inlet  20 , such that the abnormal electrical connection between the pixel electrode  216  of the active matrix substrate  210  and the common electrode  228  of the opposite substrate  220  would not occur, and further the problems of white spots/black spots can be prevented. The arrangement of the upper particle barrier  222  can lower the occurrence rate of the above-mentioned problems by 90 percent approximately.  
      More particularly, the arrangement of the upper particle barrier  222  adjacent to the liquid crystal injection inlet  200  can be shown as the region  40 , the region  50 , the region  60  or combinations thereof. The shape and the size of the upper particle barrier  222  are not limited in the present invention.  
      In accordance with the foregoing description, the upper particle barrier  222  adjacent to the liquid crystal injection inlet  20  has the function of stopping the particles P during the liquid crystal injection process. Therefore, the abnormal electrical connection between the pixel electrode  216  of the active matrix substrate  210  and the common electrode  228  of the opposite substrate  230  is avoided, and further the defects (white spots or black spots) during operation would not occur. Therefore, the LCD panel  200  of the present invention may lower the occurrence of defects during operation efficiently, and further improve the display quality of the LCD panel. In other words, the LCD panel  200  of the present invention has a higher fabrication yield.  
     Second Embodiment  
       FIG. 6A  is a schematic cross-sectional view showing an LCD panel according to a second embodiment of the present invention. Referring to  FIG. 6A , this embodiment is similar to the first embodiment, and the difference between them lies in that a lower particle barrier  212  is formed on the active matrix substrate  210  in this embodiment. The lower particle barrier  212  is disposed on the active matrix substrate  210  and below the upper particle barrier  222 .  
      More particularly, the lower particle barrier  212  comprises a dielectric layer  212   a  and an organic material layer  212   b , and has a plurality of concave portions H 1 . The organic material layer  212   b  is disposed on the dielectric layer  212   a , and the concave portions H 1  are formed in the organic material layer  212   b . More particularly, an organic layer (not shown herein) can be disposed on the pixel electrode  216  of the display region, between the passivation layer  214  and the pixel electrode  216 , or between the passivation layer  214  and the substrate  211 . The organic layer and the organic material layer  212   b  can be fabricated at the same time; however the fabrication process of the organic layer is not limited in the present invention. In addition, the depth of the concave portions H 1  is not limited in the present invention. The concave portions having different depths are illustrated in the following with accompanying drawings.  
      Referring to  FIG. 6B , the dielectric layer  212   a  is exposed by the concave portions H 2  of the dielectric layer  212   a . In other words, the dielectric layer  212   a  is disposed on the active matrix substrate  210 , and a plurality of organic bumps OB are disposed on the dielectric layer  212   a.    
      Next, referring to  FIG. 6C , the concave portions H 3  are formed in the organic material layer  212   b  and the dielectric layer  212   a  in another embodiment. In other words, the dielectric layer  212   a  has a pattern of a plurality of successive concaves and convexes, and the organic bumps OB are disposed on the convexes of the dielectric layer  212   a . On the other hand, the organic material layer  212   b  having concave portions H 3  may completely cover the dielectric layer  212   a  but not expose the dielectric layer  212   a  (not shown).  
      As shown in  FIG. 6D , the substrate  211  is exposed by the concave portions H 4  of the dielectric layer  212   a  and the organic material layer  212   b . In other words, a plurality of dielectric bumps DB are disposed on the active matrix substrate  210 , and a plurality of organic bumps OB are disposed on the dielectric bumps OB, respectively. It should be noted that the lower particle barrier  212  and the upper particle barrier  222  have the same functions, and the shape of the lower particle barrier  212  and the upper particle barrier  222  is not limited in the present invention.  
     Third Embodiment  
      This embodiment is similar to the first embodiment, and the difference between them is that the LCD panel  300  only comprises the lower particle barrier  212  formed on the substrate  211  only.  
       FIG. 7A  is a schematic diagram showing an LCD panel according to a third embodiment of the present invention. Referring to  FIG. 7A , an LCD panel  300  of the present invention comprises an active matrix substrate  210 , an opposite substrate  220 , a first sealant  230 , a liquid crystal layer  240 , a lower particle barrier  212  and a second sealant  250 . The active matrix substrate  210  comprises an organic layer  214 , and the organic layer  214  may comprise a passivation layer  214   a  and an organic material layer  214   b . Generally speaking, the active matrix substrate  210  comprises a substrate  211 , a plurality of scan lines (not shown herein) and a plurality of data lines (not shown herein) on the substrate  211 , a plurality of thin film transistors (not shown), and a pixel electrode  216  disposed on the organic layer  214  and electrically connected to the thin film transistor. The pixel electrode  216  (as shown in  FIG. 8 ) of the active matrix substrate  210  can be disposed between the passivation layer  214   a  and the organic material layer  214   b , so that it is adapted for different kinds of LCD panels such as the transmissive LCD, the reflective LCD or the transflective LCD.  
      Referring to  FIG. 7A , it is clear that the opposite substrate  220  is disposed above the active matrix substrate  210 , and the opposite substrate  220  can be a color filter substrate  220 ′. More particularly, the color filter substrate  220 ′ comprises a substrate  221 , a black matrix  224  and a plurality of color filters  226 . The black matrix  224  is disposed on the substrate  221  and is adapted for defining a plurality of lattices D. The color filters  226  are disposed on the substrate  221  and within the lattices D, respectively. Generally, the opposite substrate  220  may further comprise a common electrode  228  disposed on the black matrix  224  and the color filters  226  corresponding to the pixel electrode  216 .  
      In addition, the first sealant  230  is disposed between the active matrix substrate  210  and the opposite substrate  220 , and the LCD panel  300  further has a liquid crystal injection inlet  20 . More particularly, a space G containing the liquid crystals is defined by the first sealant  230 , the active matrix substrate  210  and the opposite substrate  220 , and the liquid crystals are injected into the space G in sequence to form the liquid crystal layer  240 . The liquid crystal layer  240  is interposed between the pixel electrode  216  of the active matrix substrate  210  and the common electrode  228  of the opposite substrate  220 .  
      It should be noted the lower particle barrier  212  is formed on the substrate  211  corresponding to the liquid crystal injection inlet  20 . The lower particle barrier  212  and the organic layer  214  can use the same materials. In other words, the lower particle barrier  212  and the organic layer  214  covering the thin film transistor (not shown herein) can be fabricated at the same time.  
      More specifically, the lower particle barrier  212  comprises a dielectric layer  212   a  and an organic material layer  212   b , and has a plurality of concave portions S 1 . The organic material layer  212   b  is disposed on the dielectric layer  212   a , and the concave portions S 1  are formed in the organic material layer  212   b . However, the depth of the concave portions S 1  is not limited in the present invention. The concave portions having different depths are illustrated in the following with accompanying drawings.  
      Referring to  FIG. 7B , the organic material layer  212   b  is exposed by the concave portions S 2  of the dielectric layer  212   a . In other words, the dielectric layer  212   a  is formed on the active matrix substrate  210 , and the organic material layer  212   b  covers the dielectric layer  212   a  and has a plurality of concaves.  
      Referring to  FIG. 7C , the concave portions S 3  are formed in the organic material layer  212   b  and the dielectric layer  212   a  in another embodiment. In other words, the dielectric layer  212   a  has a pattern of a plurality of successive concaves and convexes, and the organic bumps OB are disposed on the convexes of the dielectric layer  212   a . On the other hand, the organic material layer  212   b  having concave portions S 3  may completely cover the dielectric layer  212   a  but not expose the dielectric layer  212   a  (not shown).  
      Next, as shown in  FIG. 7D , the substrate  211  is exposed by the concave portions S 4  of the dielectric layer  212   a  and the organic material layer  212   b . In other words, a plurality of dielectric bumps DB are disposed on the active matrix substrate  210 , and a plurality of organic bumps OB are disposed on the dielectric bumps OB, respectively.  
      Referring to  FIG. 7A , the second sealant  250  is disposed adjacent to the liquid crystal injection inlet  200 , and the liquid crystal layer  240  is sealed between the active matrix substrate  210  and the opposite substrate  220  by the first sealant  230  and the second sealant  250 .  
      In summary, the LCD panel of the present invention has the following advantages:  
      1. The LCD panel of the present invention makes use of the upper particle barrier and/or lower particle barrier to prevent the particles accompanying the liquid crystals from entering the LCD panel through the liquid crystal injection inlet during the liquid crystal injection process. Therefore, this design can lower the defects (white spot or black spot) of the LCD panel due to the particles and further improve the display quality of the LCD panel.  
      2. When the liquid crystals flow through the liquid crystal injection inlet, the upper particle barrier and/or lower particle barrier could produce a turbulent flow to stop the particles accompanying the liquid crystals. Thus, the LCD panel of the present invention has a higher fabrication yield.  
      It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.