JP2016024268A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device that suppresses variation in a gap between a TFT substrate and a counter substrate and prevents occurrence of display irregularity in an operation at high temperature.SOLUTION: A bank-like projection 10 is formed in a sealing part of a TFT substrate 100; and a filler is mixed in a sealing material 20. A maximum diameter dmax of the filler defined by (average of the filler diameter)+(variance σ) and an interval a between the bank-like projection 10 and a counter substrate 200 satisfy a>dmax; a minimum diameter dmin of the filler defined by (average of the filler diameter)-(variance σ) and a minimum interval c in a direction parallel to the major plane of the counter substrate 200, between the bank-like projection 10 and a bank-like spacer 230 formed on the counter substrate 200 satisfy c<dmin. When a moisture content conditioning material is used for the bank-like projection 10, display irregularity in a high-temperature operation can be suppressed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a display device, and more particularly to a liquid crystal display device that prevents unevenness of the liquid crystal layer thickness in the peripheral portion and prevents unevenness of brightness during high-temperature operation.

  In a liquid crystal display device, a TFT substrate in which pixels having pixel electrodes and thin film transistors (TFTs) are formed in a matrix and a counter substrate are arranged opposite the TFT substrate, and liquid crystal is sandwiched between the TFT substrate and the counter substrate. It has become the composition. An image is formed by controlling the light transmittance of the liquid crystal molecules for each pixel.

  In a liquid crystal display device, there is a strong demand to increase the display area while keeping the outer shape small. As a result, the width from the end of the display area to the end of the liquid crystal display panel is reduced, resulting in a so-called narrow frame. In order to obtain a narrow frame, various structures have been developed as the structure of the seal portion that bonds the TFT substrate and the counter substrate.

  On the other hand, there is a strong demand for a small-sized liquid crystal display device to reduce the thickness. In response to this, the TFT substrate and the counter substrate are polished to a thickness of 0.2 mm or less. On the other hand, in order to increase the filling speed of the liquid crystal, instead of the conventional vacuum injection, for example, the liquid crystal is dropped on the counter substrate formed with the sealing material 20 in an annular shape, and then the liquid crystal is sealed by adhering to the TFT substrate. The dropping method (ODF One Drop Fill) is used.

  In the dropping method, since the liquid crystal is dropped inside the sealing material before the sealing material is sufficiently cured, the liquid crystal may be contaminated by the sealing material due to the reaction between the liquid crystal and the sealing material. Patent Document 1 describes a configuration in which a recess is formed in a TFT substrate inside the sealing material in order to shorten the time for the liquid crystal to contact the sealing material before the sealing material is cured.

JP2011-158525A

  Since the liquid crystal display panels are individually manufactured, the efficiency is low. Therefore, a mother substrate on which a plurality of liquid crystal display panels are formed is formed, and this is separated by a scribing method or the like. If a sealing material is present in the portion where the scribe line is inserted, the glass cannot be broken when the individual liquid crystal display panels are separated by impact after scribing, and therefore the sealing material is often not formed on the sealing portion. If the frame is narrow, there is not enough space for the scribing line.

  Therefore, a bank-like spacer is formed in the portion of the scribing line and separated at the bank-like spacer portion. That is, if a bank-like spacer is formed in advance in the scribing portion, the sealing material in that portion can be eliminated. Moreover, since the bank-like spacer is formed by photolithography, the width can be easily controlled.

  FIG. 13 is a plan view showing a seal portion that is a boundary portion of each liquid crystal display panel in the mother counter substrate of the mother substrate. A bank-like spacer 230 is formed at the boundary of each liquid crystal display panel. A scribing line 400 indicated by a dotted line in FIG. 13 is formed in a portion where the bank-like spacer 230 is formed. The sealing material 20 is applied to the inside of the bank-like spacer 230 by a dispenser or the like.

  Thereafter, liquid crystal is dropped and bonded to the mother TFT substrate. When the mother counter substrate and the mother TFT substrate are bonded together, the sealing material 20 is crushed and spreads as shown by an arrow, and the sealing material 20 is filled up to the wall of the bank-like spacer 230. FIG. 14 is a cross-sectional view of the seal portion of the liquid crystal display panel after being separated into individual liquid crystal display panels. Although details will be described later, when the sealing material 20 spreads, the sealing material 20 is buried under the bank-like spacer 230 formed on the counter substrate.

  The sealing material 20 is mixed with a filler for the purpose of adjusting the viscosity. When this filler enters under the bank-like spacer 230, as shown in FIGS. 15 and 16, a defective gap between the TFT substrate and the counter substrate occurs in the seal portion. FIG. 15 is a detailed cross-sectional view of the seal portion, showing a state where the filler 250 has entered between the bank-like spacer 230 on the counter substrate side and the uppermost layer film such as an organic passivation film or an insulating film on the TFT substrate side. Yes.

  In a state where the bank-like spacer 230 on the counter substrate side and the uppermost layer film on the TFT substrate side are arranged with a predetermined interval, the interval between the TFT substrate and the counter substrate is defined to be a regular interval. Therefore, when the filler 250 enters this portion, the distance between the TFT substrate 100 and the counter substrate 200 becomes larger than the original design. FIG. 16 is a cross-sectional view schematically showing this state.

  FIG. 16 is a cross-sectional view of the vicinity of the seal portion. In FIG. 16, a filler 250 is inserted between the bank-like spacer 230 of the counter substrate 200 and the organic passivation film 104 on the TFT substrate 100 side, and the distance between the TFT substrate 100 and the counter substrate 200 (hereinafter also referred to as a gap) is It is larger than the specified value. Originally, the distance between the TFT substrate 100 and the counter substrate 200 is defined by the first columnar spacer 210, but in FIG. 15, there is a distance between the first columnar spacer and the organic passivation film 104 on the TFT substrate side. Existing.

  As shown in FIG. 16, when the gap is increased in the seal portion, the influence reaches the display region 500, and the layer thickness of the liquid crystal layer in the display region is increased. This changes the transmission characteristics of the liquid crystal and causes display unevenness.

  On the other hand, when the liquid crystal display device is energized at a high temperature (for example, 70 ° C.), display unevenness occurs. Such display unevenness does not occur under conditions such as high temperature and high humidity (for example, 70 ° C., 80%). This can be considered that the moisture in the liquid crystal display panel is extremely reduced under high-temperature energization. In other words, it has been thought that it is better in principle that there is no moisture in the liquid crystal display panel, but an extreme dehydration state is considered to affect the display mechanism in the liquid crystal display panel.

  An object of the present invention is to prevent the seal member 20 and the filler 250 from entering under the bank-like spacer 230 near the scribe line 400 to prevent gap unevenness between the TFT substrate and the counter substrate, and display unevenness in high-temperature energization. It is to realize a liquid crystal display device that eliminates the problem.

  The present invention overcomes the above problems, and specific means are as follows.

  (1) A TFT substrate having a display region and a terminal portion, on which an organic passivation film is formed, and a counter substrate having a bank-like spacer formed on the seal portion are formed on the seal portion surrounding the display region. A liquid crystal display device in which liquid crystal is sealed inside, and a liquid crystal display device is sealed in the seal portion of the TFT substrate, and a filler is mixed in the seal material. When the average value of the filler diameter + the value of the dispersion σ is defined as the filler maximum diameter dmax, and the distance between the bank-like protrusion and the counter substrate is a, a> dmax, and the diameter of the filler The value of average value−dispersion σ is defined as the filler minimum diameter dmin, and the minimum distance between the bank-shaped protrusion and the bank-shaped spacer formed on the counter substrate in the direction parallel to the main surface of the counter substrate is defined as c If a liquid crystal display device which is a c <dmin.

  (2) The liquid crystal display device according to (1), wherein c is larger than 2 μm.

  (3) The liquid crystal display device according to (1), wherein the bank-shaped protrusion is a porous inorganic material.

  (4) The liquid crystal display device according to (3), wherein the porous inorganic material is silica gel.

  (5) The liquid crystal display device according to (1), wherein the bank-like protrusion is formed in a groove-like through hole of the organic passivation film.

  (6) The liquid crystal display device according to (1), wherein the bank-like projections are formed on the organic passivation film.

  (7) The liquid crystal display device according to (1), wherein the bank-like protrusions are formed so as to surround a display area.

  (8) The liquid crystal display device according to (1), wherein the bank-like protrusions are formed in an island shape around a display region when seen in a plan view.

It is a top view of the liquid crystal display device of this invention. It is AA sectional drawing of FIG. FIG. 3 is an enlarged plan view corresponding to FIG. 2. It is an expanded sectional view of the seal part of FIG. It is another example of the expanded sectional view of the seal part of FIG. It is a plane schematic diagram which shows this invention. It is a plane schematic diagram which shows the other example of this invention. It is a plane schematic diagram which shows the further another example of this invention. It is a plane schematic diagram which shows the further another example of this invention. It is a plane schematic diagram which shows the further another example of this invention. It is a plane schematic diagram which shows the further another example of this invention. FIG. 3 is a cross-sectional view taken along the line AA in FIG. It is a top view of a mother board. It is sectional drawing of the seal part by a prior art example. It is an expanded sectional view which shows the trouble of a prior art example. It is a schematic cross section which shows the trouble of a prior art example.

  The contents of the present invention will be described in detail below using examples.

  FIG. 1 is a plan view of a liquid crystal display panel to which the present invention is applied. In FIG. 1, the TFT substrate 100 and the counter substrate 200 are bonded together by the sealing material 20, and the liquid crystal is sandwiched between the TFT substrate 100 and the counter substrate 200. The TFT substrate 100 is formed to be larger than the counter substrate 200, and a portion where the TFT substrate 100 is one is a terminal portion 150. The terminal portion 150 is formed with an IC driver 160 for driving the liquid crystal display panel, a terminal for connecting a flexible wiring board for supplying power, video signals, scanning signals and the like to the liquid crystal display panel.

  In FIG. 1, scanning lines 30 extend in the horizontal direction in the display area 500 and are arranged in the vertical direction. The video signal lines 40 extend in the vertical direction and are arranged in the horizontal direction. A region surrounded by the scanning line 30 and the video signal line 40 is a pixel 35. In the narrow frame, the distance w between the end of the display area 500 and the end of the liquid crystal display device is as small as about 1 mm. Then, when the gap is increased in the seal portion, the influence extends to the display region 500, and the layer thickness of the liquid crystal layer is increased, which causes display unevenness.

  FIG. 2 is a detailed cross-sectional view of a seal portion corresponding to the AA cross section of FIG. In FIG. 2, a first insulating film 101 is formed on a TFT substrate 100 made of glass. The first insulating film 101 may be an undercoat film formed in order to prevent impurities from glass from contaminating the TFT semiconductor layer. A second insulating film 102 is formed on the first insulating film 101. The second insulating film 102 may be a gate insulating film in a TFT. A scanning line lead line 103 is formed on the second insulating film 102. A rectangular scanning line lead line 103 is a cross section of the scanning line lead line 103 from the lower side of the drawing in FIG.

  An organic passivation film 104 is formed so as to cover the scanning line lead line 103. The organic passivation film 104 is formed as thick as 2 to 3 μm and also serves as a planarizing film. The organic passivation film 104 is formed of a photosensitive resin and does not require a photoresist for patterning.

  An interlayer insulating film 105 made of SiN is formed on the organic passivation film 104. The interlayer insulating film 105 is an interlayer insulating film provided between a planar lower electrode and an upper electrode having a slit in a display region of an IPS liquid crystal display device. In some cases, the lower layer electrode is a common electrode and the upper layer electrode is a pixel electrode, and vice versa. Both the lower layer electrode and the upper layer electrode are formed of a transparent conductive film typified by ITO (Indium Tin Oxide). Yes.

  In FIG. 2, an alignment film 106 is formed on the interlayer insulating film 105. The alignment film 106 is initially applied with an alignment film material, which is a liquid, by flexographic printing, inkjet, or the like. However, the alignment film material is recessed in the organic passivation film 104 as a stopper so that the alignment film material does not reach the outer end of the seal portion. Are formed in three places. Further, the groove-like through hole 1041 formed further outside the recess also serves as a stopper for the alignment film material. In FIG. 2, the alignment film material passes over the three recesses and stops at the last groove-like through hole 1041. However, when the strength of the seal portion is maintained, the alignment film may be formed beyond the outer end portion of the seal portion.

  In FIG. 2, a black matrix 201 is formed on the counter substrate 200 side. The black matrix 201 in FIG. 2 is provided to prevent light leakage from the seal portion. Since the black matrix 201 is made of resin, black matrix grooves 2011 are formed in order to block moisture penetrating the resin. On the black matrix 201, color filters 202 are formed in stripes in the direction perpendicular to the paper surface. Although not particularly limited, the color filter 202 is formed corresponding to the first columnar spacer 210 formed on the overcoat film 203.

  An overcoat film 203 is formed on the color filter 202. The overcoat film 203 has a convex portion corresponding to the color filter 202 portion. The convex portion has a role of preventing the alignment film material from spreading toward the outside of the substrate when the alignment film material is applied. A first columnar spacer 210 is formed on the overcoat film 203. The first columnar spacer 210 has a role of defining a distance between the counter substrate 200 and the TFT substrate 100 in the seal portion. Between the first columnar spacer 210 and the first columnar spacer 210, a second columnar spacer 220 having a height lower than that of the first columnar spacer 210 is formed. The second columnar spacer 220 has a role of preventing the distance between the TFT substrate 100 and the counter substrate 200 from becoming excessively small when pressure is applied to the counter substrate 200 from the outside.

  An alignment film 106 is formed so as to cover the overcoat film 203. A bank-like spacer 230 is formed at the end of the seal portion. The planar shape of the bank-like spacer 230 is as shown in FIG. The bank-like spacer 230 is arranged at the boundary between adjacent liquid crystal display panels on a mother substrate on which a plurality of liquid crystal display panels are formed, and is scribed along the center of the bank-like spacer 230, and then broken into individual pieces. Separate the LCD panel. When there is no bank-like spacer 230, this portion becomes the sealing material 20, but if the sealing material 20 exists, it cannot be broken even if scribing is performed.

  In FIG. 2, the alignment film 106 on the counter substrate 200 side gets over the convex portions formed on the overcoat film 203 and stops at the bank-like spacer 230. On the counter substrate 200 side, the alignment film 106 is formed on the overcoat film 203.

  In the sealing portion, the TFT substrate 100 and the counter substrate 200 are bonded by the sealing material 20. In FIG. 2, the liquid crystal 300 is filled inside the sealing material 20. In FIG. 2, the sealing material 20, in particular, the filler 250 included in the sealing material 20 enters the outside by the protrusions 10 disposed in the groove-like through holes 1041 formed in the organic passivation film 104 on the TFT substrate side. Is preventing. The dimensions near the protrusion 10 will be described later.

  If the filler 250 does not enter between the bank-like spacer 230 and the TFT substrate, even if the sealing material 20 enters a slight gap, it does not affect the breaking operation and also affects the gap in the display area. If not, it doesn't matter. For example, the filler 250 is mixed in the sealing material 20 in order to adjust the viscosity of the sealing material 20. In the present invention, the gap between the TFT substrate and the counter substrate is defined by columnar spacers. However, depending on the product type, the gap in the seal portion may be defined by a filler mixed in the sealing material 20. Thus, there are cases where several types of fillers are mixed in the sealing material, such as a filler 250 for adjusting the viscosity of the sealing material and a filler for defining the gap. In this specification, the filler 250 for adjusting the viscosity is mainly described as an influence on the gap of the display region by entering between the bank-like spacer 230 and the TFT substrate. It may be applied to fillers of other sizes and fillers of other sizes. Moreover, when several types of fillers are mixed, it is also possible to apply by limiting to one type or several types of fillers which are problematic depending on the mixing density and size of each filler.

  FIG. 3 is a plan view of a portion corresponding to FIG. 2 mainly on the counter substrate 200 side. In FIG. 3, the sealing material 20 is formed inside the bank-like spacer 230. In FIG. 3, the color filter 202 is formed in a stripe shape, and a first columnar spacer 210 is disposed in a portion corresponding to the color filter 202. In FIG. 3, the color filter 202 and the first columnar spacers 210 are shown in two rows. A second columnar spacer 220 is disposed between the first columnar spacer 210 and the first columnar spacer 210. The sealing material 20 passes between the first columnar spacer 210 and the second columnar spacer 220, passes between the bank-shaped protrusion 10 and the overcoat film 203 on the counter substrate 200 side, and extends to the bank-shaped spacer 230.

  A bank-like projection 10 is formed between the bank-like spacer 230 and the color filter 202. The protrusion 10 has a role of preventing the filler 250 in the sealing material 20 from entering the bank-like spacer 230 side. Further, by forming the bank-like projections 10 with a material capable of adjusting moisture, it is possible to prevent display unevenness due to a change in moisture content in the liquid crystal display panel.

  That is, when the water content in the liquid crystal display panel becomes low, such as during high-temperature energization, the water is supplied from the water adjustment material 10, and when the normal state is reached, the excess water is removed from the water adjustment material. Absorbs. Thereby, the amount of moisture in the liquid crystal display panel can be kept constant. In addition, moisture entering from the outside can be absorbed by the moisture adjusting material 10.

  As the moisture adjusting material 10, a porous inorganic material can be used. As the moisture adjusting material 10, for example, silica gel can be used. The moisture adjusting material 10 can be formed by coating, or can be formed by sputtering or vapor deposition. However, as will be described later, the protrusion 10 made of the moisture adjusting material is formed to be thicker than the organic passivation film 104, so that the application is most suitable.

  4 is an enlarged cross-sectional view of a portion of the bank-like protrusion 10 in FIG. In FIG. 4, the protrusion 10 is formed in the groove-like through hole 1041 portion of the organic passivation film 104. The distance a between the protrusion 10 and the alignment interval 106 on the overcoat film 203 on the counter substrate 200 side is larger than the diameter of the filler 250 mixed in the sealing material 20. This is to prevent the filler 250 from affecting the gap between the TFT substrate and the counter substrate even if the sealing material 20 enters between the overcoat film 203 and the protrusion 10.

  However, the distance c between the protrusion 10 and the bank-like spacer 230 is smaller than the diameter of the filler 250. This is because when the sealing material 20 including the filler 250 enters between the bank-like spacer 230 and the protrusion, the filler 250 does not enter between the bank-like spacer 230 and the organic passivation film 104 or the interlayer insulating film 105 on the TFT substrate 100 side. This is to prevent the gap between the TFT substrate 100 and the counter substrate 200 from fluctuating.

  Here, the distance c between the protrusion 10 and the bank-like spacer 230 can be said to be the minimum distance in the direction parallel to the main surface of the counter substrate 200. Further, the diameter of the filler 250 has a predetermined variation. The diameter of the filler 250 here is an average value of the diameter of the filler 250 + dispersion σ when compared with the interval a, and is an average value of the diameter of the filler 250−dispersion σ when compared with the interval c.

  On the other hand, when the TFT substrate 100 and the counter substrate 200 are bonded together, misalignment occurs, but it is desirable that the distance c between the protrusion 10 and the bank-like spacer 230 be larger than this misalignment. This is because when the protrusion 10 and the bank-like spacer 230 are combined, the gap variation between the TFT substrate 100 and the counter substrate 200 occurs. The lower limit of misalignment between the TFT substrate 100 and the counter substrate 200 at the present time is about 2 μm. Assuming that the alignment accuracy of the TFT substrate 100 and the counter substrate 200 is 2 μm and the diameter of the filler 250 is 2.5 μm, the distance c between the protrusion 10 and the bank-like spacer 230 is 2 μm <c <2.5 μm. is there.

  The width b of the protrusion 10 is not limited as long as the filler 250 in the sealing material 20 can be stopped. However, when the protrusion 10 has a moisture adjustment function, a certain amount of volume is required. Degree is desirable. Therefore, the width of the groove-like through hole 1041 formed in the organic passivation film 104 is larger than the width of this protrusion.

  FIG. 5 shows an example in which the protrusion 10 and the bank-like spacer 230 have a tapered cross section in FIG. A in FIG. 5 is the same as described in FIG. In FIG. 5 c, the smallest portion in the direction parallel to the main surface of the counter substrate 200 may be taken in the interval between the side surface of the tapered protrusion 10 and the side surface of the bank-like spacer 230. The side surface of the bank-like spacer 230 and the side surface of the protrusion 10 may be parallel, but may not be parallel as shown in FIG. FIG. 5 c shows the distance from the top of the side surface of the protrusion 10 to the bank-like spacer 230. With the structure of FIG. 5, even if the filler 250 enters between the protrusion 10 and the bank-like spacer 230, a sufficient space for retaining the filler 250 can be secured. Further, unlike FIG. 5, the gap between the protrusion 10 and the bank-like spacer 230 may be narrowed toward the bottom in the figure. In this case, when the filler 250 is interposed between the protrusion 10 and the bank-like spacer 230, an effect of pushing the filler 250 in the display area direction can be expected.

  FIG. 6 is a schematic plan view of the TFT substrate 100 of the liquid crystal display panel of the present invention. In FIG. 6, an interlayer insulating film 105 is formed around the region excluding the terminal portion 150. A groove-like through hole 1041 of the organic passivation film 104 is formed inside the interlayer insulating film 105, and a bank-like protrusion 10 is formed inside the groove-like through hole 1041. An alignment film 106 is formed inside the bank-shaped protrusion 10 so as to include the display area.

  In the configuration of FIG. 6, the bank-like protrusions 10 are formed all around the display area, so that the filler 250 enters between the bank-like spacer 230 and the organic passivation film 104 on the TFT substrate side around the periphery of the seal portion. Can not be. In addition, when the bank-like protrusion 10 is used as a moisture adjusting material, the volume is large and the moisture adjusting performance is also large.

  FIG. 7 shows an example in which the bank-like projections 10 are formed along the side portions of the display region 500 and there are portions where the projections 10 are not formed at the corner portions. When there is no influence of the filler 250 of the sealing material 20 at the corner, such a shape can be obtained. Other configurations are the same as those in FIG. In contrast to FIG. 7, FIG. 8 shows the present invention when the gap variation due to the influence of the filler 250 of the sealing material 20 is large at the corner portion or when the gap variation due to the influence of the filler 250 is small at the side portion. It is an example to apply. In the case of this configuration, the effect of adjusting moisture when the bank-like protrusion 10 is used as a moisture adjusting material is particularly effective at the display area corner portion.

  FIG. 9 shows an example in which the bank-like projections 10 are formed in an island shape along the short side. This case is effective when there is a gap variation between the TFT substrate 100 and the counter substrate 200 on the short side. Conversely, FIG. 10 shows an example in which the bank-like protrusions 10 are formed in an island shape along the long side. This case is effective when there is a gap variation between the TFT substrate 100 and the counter substrate 200 on the long side. FIG. 11 shows an example in which the bank-like projections 10 are formed in an island shape on the long side, the short side, and the corner. In this case, the bank-like projections 10 are arranged in a place where the influence on the gap fluctuation is particularly large. In any of the examples, the moisture adjusting action when the bank-like protrusion 10 is used as a moisture adjusting material has a particularly large influence on the display area corresponding to the portion where the island-like bank-like protrusion 10 is formed.

  FIG. 12 is a cross-sectional view showing a second embodiment of the present invention. FIG. 12 is also a cross-sectional view corresponding to the AA cross section of FIG. FIG. 12 is different from FIG. 2 in a portion where the bank-like protrusion 10 is formed. In FIG. 12, the organic passivation film 104 is left like a bank in the groove-like through hole 1041 of the organic passivation film 104, and the bank-like protrusion 10 is formed thereon.

  The feature of FIG. 2 is that since the bank-like protrusion 10 is formed on the organic passivation film 104, the thickness of the bank-like protrusion 10 can be reduced. Therefore, the bank-like projections 10 in this embodiment can be easily formed not only by coating but also by sputtering or vapor deposition. In FIG. 2, the bank-like protrusion 10 is formed directly on the organic passivation film 104, but the interlayer insulating film 105 is left on the organic passivation film 104 in this portion, and the bank-like protrusion 10 is formed on the interlayer insulating film 105. The protrusion 10 may be formed.

    In FIG. 12, the relationship between the distance a between the overcoat film 203 on the counter substrate 200 side and the bank-like protrusion 10 and the diameter of the filler 250 included in the sealing material 20 is the same as that described in FIG. It is. Further, the relationship between the distance c between the bank-like protrusion 10 and the bank-like spacer 230 on the counter substrate 200 side and the diameter of the filler 250 included in the sealing material 20 is the same as that described in FIG. 4 of the first embodiment. .

  FIG. 12 shows a structure in which the organic passivation film 104 is left like a bank in the groove-like through hole 1041 of the organic passivation film 104. Accordingly, one groove-like through hole 1041 of the organic passivation film 104 exists on the inner side and the outer side of the bank-like protrusion 10. However, depending on the product, the bank-like protrusion 10 may be formed inside or outside the groove-like through hole 1041 by using one groove-like through hole 1041. Further, when the groove-like through hole 1041 of the organic passivation film 104 is not necessary, the bank-like protrusion 10 may be formed on the organic passivation film 104.

  In the second embodiment, when the bank-like protrusion 10 is used as a moisture adjusting material, the effect of the moisture adjusting action is small because the volume is smaller than in the case of the first embodiment. Whether to use Example 2 may be determined in consideration of the product specifications.

  Although both the first and second embodiments have been described on the assumption that the IPS liquid crystal display device is used, the present invention is not limited to the IPS liquid crystal display device, but may be applied to other liquid crystal display devices such as VA and TN. be able to. It is also possible to provide the bank-like protrusion 10 on the counter substrate side and provide the bank-like spacer on the TFT substrate.

    According to the present invention, since the gap variation in the seal portion can be suppressed, a phenomenon in which the gap in the display region is fluctuated due to the variation in the gap in the seal portion can be prevented, and uneven brightness due to this can be suppressed. it can.

  In addition, according to the present invention, since the amount of moisture in the liquid crystal display panel can be kept constant by using the moisture adjusting material, luminance unevenness due to variation in moisture can be prevented.

  DESCRIPTION OF SYMBOLS 10 ... Bank-like protrusion, moisture adjustment layer, 20 ... Sealing material 20 ... Scanning line, 40 ... Video signal line, 35 ... Pixel, 100 ... TFT substrate, 101 ... First insulating film, 102 ... Second insulating film, DESCRIPTION OF SYMBOLS 103 ... Scan line leader line 104 ... Organic passivation film, 105 ... Interlayer insulation film, 106 ... Orientation film, 150 ... Terminal part, 160 ... IC driver, 200 ... Opposite substrate, 201 ... Black matrix, 202 ... Color filter, 203 DESCRIPTION OF SYMBOLS ... Overcoat film | membrane 210 ... 1st columnar spacer, 220 ... 2nd columnar spacer, 230 ... Bank-like spacer, 250 ... Filler, 300 ... Liquid crystal, 400 ... Scribing line, 500 ... Display area, 1041 ... Groove-shaped through-hole, 2011 ... Black matrix groove

Claims (8)

A sealing material formed on the seal portion, which includes a display substrate and a TFT substrate on which an organic passivation film is formed, and a counter substrate on which a bank-like spacer is formed on the seal portion. Is a liquid crystal display device in which liquid crystal is sealed inside,
A bank-like projection is formed on the seal portion of the TFT substrate,
Filler is mixed in the sealing material,
The average value of the filler diameter + the value of dispersion σ is defined as the filler maximum diameter dmax,
When the distance between the bank-like protrusion and the counter substrate is a,
a> dmax,
The average value of the filler diameter-the value of dispersion σ is defined as the filler minimum diameter dmin,
When the minimum distance between the bank-shaped protrusion and the bank-shaped spacer formed on the counter substrate in the direction parallel to the main surface of the counter substrate is c,
A liquid crystal display device, wherein c <dmin.   The liquid crystal display device according to claim 1, wherein c is larger than 2 μm.   The liquid crystal display device according to claim 1, wherein the bank-shaped protrusion is a porous inorganic material.   The liquid crystal display device according to claim 3, wherein the porous inorganic material is silica gel.   The liquid crystal display device according to claim 1, wherein the bank-like protrusion is formed in a groove-like through hole of the organic passivation film.   The liquid crystal display device according to claim 1, wherein the bank-like protrusions are formed on the organic passivation film.   The liquid crystal display device according to claim 1, wherein the bank-shaped protrusion is formed so as to surround a display area.   The liquid crystal display device according to claim 1, wherein the bank-like protrusions are formed in an island shape around a display area when seen in a plan view.

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