JP2012163984A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of suppressing generation of dust caused by friction between a display panel and ribs.SOLUTION: A display device comprises: a liquid crystal display panel 12 having a rectangular panel part; and a back light 11 having a mounting surface 35 to which the liquid crystal display panel 12 is mounted and ribs 32 which are projected from the mounting surface 35 at outer edge portions of the mounting surface 35 so as to regulate an in-plane direction position of the display panel 12. The liquid crystal display panel 12 is composed of a lower substrate 24 and an upper substrate 25, and includes a first panel part in which an outer edge of the upper substrate 25 is arranged at the inner side than an outer edge of the lower substrate 24 and a second panel part in which the outer edge of the upper substrate 25 and the outer edge of the lower substrate 24 are arranged so as to become substantially flush. At least a portion of the ribs 32 arranged so as to face the second panel part is composed of rib parts having position regulation walls facing the display panel 12 side and a groove 75 retreating from the position regulation walls in the vicinity of a joint surface.

Description

  The present invention relates to a display device, and more particularly, a backlight including a light emitting surface and a rib formed around the light emitting surface, and is mounted on the light emitting surface of the backlight, and is in-plane direction by the rib. The present invention relates to a display device including a display panel having a panel portion whose position is defined.

  A liquid crystal display device generally has a structure in which a position is fixed by sandwiching a liquid crystal display panel between a backlight and a shield front. 18 is a perspective view showing a configuration of a conventional liquid crystal display device as viewed from the display surface side, and FIG. 19 is a perspective view showing the liquid crystal display device of FIG. 18 in an unfolded state. The liquid crystal display device 100 includes a backlight 11 having a rectangular light emitting surface 11a on the front surface side, a liquid crystal display panel 12 provided on the light emitting surface 11a and having an optical switching function, and a shield front that defines the display surface 13a. 13.

  The liquid crystal display panel 12 includes a panel unit 21, a plurality of TCP (Tape Carrier Package) 22 connected to the panel unit 21, and a circuit board 23 mechanically and electrically connected to the TCP 22. The TCP 22 has an IC for driving the panel unit 21, and the circuit board 23 outputs a control signal for controlling the driving of the TCP 22.

  The panel unit 21 includes a liquid crystal layer (not shown), a pair of substrates 24 and 25 that sandwich the liquid crystal layer, and polarizing plates (not shown) disposed on the outer surfaces of the substrates 24 and 25, respectively. The panel unit 21 has pixels arranged in a matrix in the plane. On one substrate 24, switching elements such as TFTs (Thin Film Transistors) for controlling the switching of each pixel are arranged in a matrix to constitute an active matrix substrate (hereinafter referred to as TFT substrate) 24. On the other substrate 25, a color filter (CF) of a color corresponding to each pixel is formed to constitute a counter substrate (CF substrate) 25. The display is controlled for each pixel by driving the TFT element via the circuit board 23 and the TCP 22.

  The TCP 22 and the circuit board 23 are disposed, for example, along two adjacent sides of the panel unit 21. At these two sides, the outer edge of the counter substrate 25 is formed inside the outer edge of the TFT substrate 24 when viewed in the in-plane direction of the panel portion 21, and the TCP 22 is formed on the exposed inner surface of the TFT substrate 24. Connected to the edge.

  The backlight 11 includes a frame-like backlight chassis 31 that defines a light emitting surface 11a on the front side. On the backlight chassis 31, ribs 32 for defining the position of the panel portion 21 are formed in the vicinity of the four corner portions of the light emitting surface 11a. One rib 32 is formed at each corner portion, and each rib 32 includes a pair of rib portions at the corner portion of the panel portion 21. Each rib portion has an elongated rectangular parallelepiped shape and is disposed along the outer edge portion of the panel portion 21. Further, in consideration of the variation in the outer dimensions of the panel portion 21 and the variation in the distance between the ribs 32, a gap of 0.2 to 0.3 mm is formed between the outer edge portion of the panel portion 21 and the ribs 32. It is arranged so that.

  20A is a plan view showing a state in which the liquid crystal display panel 12 is placed on the backlight 11 in the liquid crystal display device of FIG. 19, and FIG. 20B is a cross-sectional view of FIG. It is sectional drawing which shows the cross section along b line. The backlight 11 is, for example, an edge light type backlight. The light emitting surface 11a has an optical sheet 33, a light guide plate 34, and a reflection sheet (illustrated) from the front side as shown in FIG. None) are sequentially disposed, and a lamp light source (not shown) is disposed on the side of the light guide plate 34. The backlight chassis 31 includes a flat mounting surface 35 on which the TFT substrate 24 is placed around the light emitting surface 11a, and a recess 36 that is formed closer to the light emitting surface 11a than the mounting surface 35 and can accommodate the polarizing plate 26. Have. Reference numeral 28 denotes a boundary of the display area of the panel unit 21.

  When the liquid crystal display device 100 is assembled, first, the panel portion 21 is aligned in the in-plane direction so that the four corner portions of the panel portion 21 are located inside the rib 32, and then the liquid crystal display panel 12 is backlit. 11 is mounted. In this mounting, the TFT substrate 24 is mounted on the mounting surface 35 in a state where the polarizing plate 26 is accommodated in the recess 36 of the backlight chassis. Further, the shield front 13 is covered so as to cover the backlight 11 and the liquid crystal display panel 12, and the assembly is completed by pushing down to a predetermined position. The backlight 11 and the shield front 13 are fixed by screwing, caulking, claw fitting, or the like.

  By the way, in the conventional liquid crystal display device 100, there is a problem in that a display defect occurs in which a shadow of dust is projected on the display surface 13a due to the adhesion of dust on the light emitting surface 11a of the backlight. This display defect has been caused by the following causes. In the liquid crystal display device 100, the bases of the TFT substrate 24 and the counter substrate 25 are formed of a transparent substrate such as a glass substrate, but the outer edge of the transparent substrate is not polished, and as indicated by reference numeral 101 in FIG. In addition, it has minute irregularities. Therefore, when the liquid crystal display device 100 vibrates, dust is generated by the outer edges of the transparent substrate contacting and rubbing against the ribs 32. The dust passes between the outer surface of the TFT substrate 24 and the mounting surface 35 of the backlight and enters the lower portion of the panel portion 21, thereby causing adhesion on the light emitting surface 11 a of the backlight. Is.

  In order to solve the above-mentioned problem, a measure for forming an inclined surface on the side surface of the rib 32 facing the panel portion 21 is employed. FIG. 21 is a sectional view showing a section corresponding to FIG. 20B for a liquid crystal display device having such an inclined surface. In the liquid crystal display device 110, an inclined surface 112 is formed on the side of the rib 32 that faces the panel portion 21.

  In the liquid crystal display device 110, the height of the boundary between the position regulating wall 111 facing the outer edge of the panel portion 21 and the inclined surface 112 is set to be lower than the inner surface of the TFT substrate 24, thereby causing the panel portion. When the outer edge portion 21 and the rib 32 come into contact with each other, only a part of the outer edge of the TFT substrate 24 comes into contact with the rib 32. It is considered that by reducing the contact area between the outer edge of the panel portion 21 and the rib 32, the generation of dust due to the friction between the panel portion 21 and the rib 32 can be suppressed. A liquid crystal display device in which an inclined surface is formed on the side surface of the rib is described in Patent Document 1, for example.

JP 2001-4983 A (FIG. 2)

  The liquid crystal display device 110 of FIG. 21 was actually manufactured, and research into the occurrence rate of the display failure was conducted. It was found that the display failure due to dust could not be sufficiently suppressed. Thus, the reason why display defects due to dust cannot be sufficiently suppressed is considered as follows.

  The panel unit 21 is formed by bonding the TFT substrate 24 and the counter substrate 25 to each other with the liquid crystal layer interposed therebetween. Therefore, depending on the bonding processing accuracy, the position of the outer edge of the TFT substrate 24 and the position of the outer edge of the counter substrate 25 do not completely coincide with each other, and a certain deviation occurs. Depending on the state of bonding of the TFT substrate 24 and the counter substrate 25, the outer edge of the counter substrate 25 may protrude outward from the outer edge of the TFT substrate 24 when viewed in the in-plane direction of the panel unit 21.

  In the liquid crystal display device shown in FIG. 21, the thickness of the TFT substrate 24 and the counter substrate 25 is 0.7 mm, for example, and the boundary between the position regulating wall 111 and the inclined surface 112 takes into account dimensional variations when the rib 32 is formed. However, the height is set to about 0.5 to 0.6 mm from the backlight mounting surface 35 so that a part thereof does not contact the counter substrate 25. The inclination angle of the inclined surface 112 is set to, for example, about 10 to 30 ° so that the liquid crystal display panel 12 can be easily placed when the liquid crystal display device 110 is assembled.

  The amount of deviation between the outer edge of the TFT substrate 24 and the outer edge of the counter substrate 25 is, for example, about 0.4 mm at the maximum. Therefore, if the protrusion amount of the outer edge of the counter substrate 25 is large, the inclination angle is set to 30 °. In addition, as indicated by reference numeral 113 in FIG. 22, prior to the contact of the TFT substrate 24 with the rib 32, the corner portion of the counter substrate 25 contacts the inclined surface 112 of the rib. The dust causing the display defect is generated by rubbing between the corner portion of the counter substrate 25 and the inclined surface 112 of the rib.

  Here, a countermeasure for sufficiently increasing the inclination angle of the inclined surface 112 may be considered so that the corner portion of the counter substrate 25 does not contact the inclined surface 112 of the rib. However, as a result of a trial calculation by the present inventor, if the maximum deviation between the outer edge of the TFT substrate 24 and the outer edge of the counter substrate 25 is 0.4 mm, the height of the boundary between the position regulating wall 111 and the inclined surface 112 is high. Even if the height is lowered to 0.5 mm from the mounting surface 35 of the backlight, as shown in FIG. 23A, if the inclination angle is not set larger than 68 °, the angle of the counter substrate 25 It is not possible to prevent the rib of the portion from coming into contact with the inclined surface 112.

  However, if the inclination angle of the inclined surface 112 is too large, as shown in FIG. 23 (b), when the liquid crystal display device 120 is assembled, the liquid crystal display panel 12 is apt to rest on the rib 32. If a member such as the shield front 13 is attached in this state, the liquid crystal display device may be defective in dimensions, or the liquid crystal display panel 12 may be damaged by stress. In particular, in a liquid crystal display device in which the size of the panel portion 21 is large, the liquid crystal display panel 12 is easy to rest on the ribs 32 because the weight of the liquid crystal display panel 12 is large.

  In order to realize a liquid crystal display device having good quality, it is essential to suppress the generation of dust due to rubbing between the liquid crystal display panel 12 and the ribs 32. In view of the above, an object of the present invention is to provide a display device capable of suppressing generation of dust due to rubbing between a display panel and a rib.

A display device according to the present invention includes a display panel, a mounting surface on which the display panel is mounted, and a rib that protrudes from the mounting surface at an outer edge portion of the mounting surface to define an in-plane direction position of the display panel. In a display device comprising a light,
The display panel includes a lower substrate and an upper substrate that are sequentially stacked from the mounting surface and bonded to each other at a bonding surface, and an outer edge of the upper substrate is disposed inside an outer edge of the lower substrate. A first panel portion; and a second panel portion in which an outer edge of the upper substrate and an outer edge of the lower substrate are disposed substantially flush with each other.
At least a portion of the rib disposed to face the second panel portion has a position restricting wall facing the display panel and a groove that recedes from the position restricting wall in the vicinity of the joint surface. It consists of parts.

  According to the display device of the present invention, the rib portion has the position restriction wall facing the display panel side and the groove that recedes from the position restriction wall in the vicinity of the joint surface, whereby the upper substrate of the display panel. Is protruding from the lower substrate, only a part of the outer edge of the upper substrate is in contact with the portion of the position regulating wall higher than the groove, and when the lower substrate of the display panel is protruding from the upper substrate, the lower substrate Only a part of the outer edge of the contact with the portion of the position regulating wall lower than the groove. Therefore, in any case, the contact area between the outer edge of the display panel and the rib can be reduced, and the generation of dust can be reduced.

  In the display device according to the present invention, since the position is defined by the more protruding substrate of the lower substrate and the upper substrate, positioning in the in-plane direction can be performed with reference to the outermost edge of the display panel. . In the display device according to the present invention, the rib portion may be configured as an entire rib in the display device. Further, the contact area between the outer edge portion of the second panel portion and the position regulating wall can be adjusted by the height and width of the groove.

It is a perspective view which expands and shows the liquid crystal display device concerning a 1st embodiment of the present invention. FIG. 2 is a plan view showing a state in which a liquid crystal display panel is placed on a backlight in the liquid crystal display device of FIG. 1. 3A and 3B are cross-sectional views showing cross sections taken along the lines aa and bb in FIG. 2, respectively. 4A is an enlarged plan view showing a dotted line IV in FIG. 2, and FIG. 4B is a cross-sectional view showing a cross section along the line aa in FIG. 4A. . It is a perspective view which expands and shows typically the dotted-line part V of FIG. It is a perspective view which shows the structure corresponded in FIG. 5 about the liquid crystal display device which concerns on the 1st modification of 1st Embodiment. It is a perspective view which shows the structure corresponded in FIG. 5 about the liquid crystal display device which concerns on the 2nd modification of 1st Embodiment. It is a perspective view which shows the structure corresponded in FIG. 5 about the liquid crystal display device which concerns on the 3rd modification of 1st Embodiment. It is a perspective view which shows the structure corresponded in FIG. 5 about the liquid crystal display device which concerns on the 4th modification of 1st Embodiment. It is a top view which shows the structure corresponded in FIG. 2 about the liquid crystal display device which concerns on the 5th modification of 1st Embodiment. It is a top view which shows the structure corresponded in FIG. 2 about the liquid crystal display device which concerns on the 6th modification of 1st Embodiment. It is a top view which shows the structure corresponded in FIG. 2 about the liquid crystal display device which concerns on the 7th modification of 1st Embodiment. FIG. 13A is a perspective view showing a configuration corresponding to FIG. 5 for the liquid crystal display device according to the second embodiment of the present invention, and FIG. 13B is a cross-sectional view taken along line bb of FIG. It is sectional drawing which shows the cross section along a line. FIG. 14A is a perspective view showing a configuration corresponding to FIG. 5 for the liquid crystal display device according to the third embodiment of the present invention. FIG. 14B is a cross-sectional view taken along line bb of FIG. It is sectional drawing which shows the cross section along a line. It is a top view which shows the structure corresponded in FIG. 4 about the liquid crystal display device which concerns on 4th Embodiment of this invention. FIG. 17 is a plan view showing a configuration corresponding to FIG. 15 for a liquid crystal display device according to a first modification of the fourth embodiment. FIG. 16 is a plan view showing a configuration corresponding to FIG. 15 for a liquid crystal display device according to a second modification of the fourth embodiment. It is a perspective view which shows the structure of the conventional liquid crystal display device. It is a perspective view which expands and shows the liquid crystal display device of FIG. 20A is a plan view showing a state in which the liquid crystal display panel is placed on the backlight in the liquid crystal display device of FIG. 19, and FIG. 20B is a bb line in FIG. 20A. It is sectional drawing which shows the cross section along line. It is sectional drawing which shows the structure of another conventional liquid crystal display device. It is sectional drawing which shows the problem of the liquid crystal display device of FIG. FIG. 23A is a cross-sectional view showing a configuration of a liquid crystal display device in which the angle of the inclined surface is changed in the liquid crystal display device of FIG. 21, and FIG. 23B is a diagram of the liquid crystal display device of FIG. It is sectional drawing which shows a problem.

  Hereinafter, the present invention will be described in more detail based on embodiments of the present invention with reference to the drawings. FIG. 1 is an exploded perspective view showing a liquid crystal display device according to a first embodiment of the present invention, and FIG. 2 is a plan view showing a state in which a display panel 12 is placed on the backlight 11 of FIG. is there. The liquid crystal display device 10 has the same configuration as the conventional liquid crystal display device 100 shown in FIGS. 18 to 20 except that the shape of the ribs 32 formed on the backlight 11 is different.

  In the panel unit 21, the TFT substrate 24 has a larger dimension than the counter substrate 25 on the two sides of the panel unit 21 to which the TCP 22 is connected. Therefore, the outer edge of the TFT substrate 24 is viewed in the in-plane direction of the panel unit 21. It has the 1st outer edge part 21a formed in the outer side rather than the outer edge of the opposing board | substrate 25, and the 2nd outer edge part 21b in which the outer edge of the TFT substrate 24 and the outer edge of the opposing board | substrate 25 were formed in the substantially the same position. In the present embodiment, the rib 32 is composed of a pair of rib portions at the corner portion of the panel portion 21, and the shape of each rib portion is the first rib portion 32a facing the first outer edge portion 21a of the panel portion, and The second rib portions 32b facing the second outer edge portion 21b of the panel portion are formed at different heights.

  The rib 32 is disposed along the side of the panel part 21 to which the TCP 22 is connected, and is formed along the side of the panel part 21 to which the TCP 41 is not connected. The first rib portion 32a and the second rib portion 32b are disposed along the side of the panel portion 21 to which the TCP 22 is not connected, and the rib 42 is configured only by the second rib portion 32b. And ribs 43 to be used. The rib 43 is disposed at the boundary between the first outer edge portion 21a and the second outer edge portion 21b of the panel portion.

  3A and 3B are cross-sectional views showing cross sections taken along the lines aa and bb in FIG. 2, respectively. In the first rib portion 32a, as shown in FIG. 3A, the height of the position regulating wall 37 is set to be substantially the same as the outer surface of the counter substrate 25. In the second rib portion 32b, as shown in FIG. 3B, the height of the position regulating wall 37 is set to be slightly lower than the inner surface of the TFT substrate 24. The thickness of the TFT substrate 24 and the counter substrate 25 is 0.7 mm, for example, and the thickness of the polarizing plates 26 and 27 is 0.2 mm, for example. In FIG. 3A, the height H1 of the first rib portion 32a is, for example, 1.6 mm, and in FIG. 3B, the height H2 of the second rib portion 32b is, for example, 0.6 mm.

  FIG. 4A is an enlarged plan view showing a dotted line IV in FIG. 2, and FIG. 4B shows a cross section taken along the line aa in FIG. The cross section taken along line bb in FIG. 4A is the same as the cross section in FIG. FIG. 5 schematically shows the dotted line portion V in FIG. 1 in an enlarged manner. In the present embodiment, the rib 32 is formed integrally with the backlight chassis 31 by molding, but may be retrofitted to the backlight chassis 31.

  In the liquid crystal display device 10, as shown in FIGS. 3A and 4B, the height of the first rib portion 32 a is set to be substantially the same as the outer surface of the counter substrate 25. Thus, the step necessary for preventing the panel portion 21 from being lifted onto the first rib portion 32a can be made sufficiently large to prevent the panel portion 21 from being lifted onto the first rib portion 32. In FIG. 2, climbing in the −X direction or −Y direction can be suppressed by the rib 41, and climbing in the + X direction or + Y direction can be suppressed by the first rib portion 32 a of the rib 43, respectively.

  In the liquid crystal display device 10, only the TFT substrate 24 abuts on the first rib portion 32a of the first outer edge portion 21a of the panel portion. Further, as shown in FIG. 3B, the height of the second rib portion 32b is set to be slightly lower than the inner surface of the TFT substrate 24, whereby the second outer edge of the panel portion. In the portion 21b, only a part of the TFT substrate 24 abuts on the second rib portion 32b. Therefore, the contact area between the outer edge portion of the panel portion 21 and the rib 32 can be reduced.

  According to the liquid crystal display device 10 of the present embodiment, since the height of the first rib portion 32a is set to be substantially the same as the outer surface of the counter substrate 25, the panel on the first rib portion 32a is set. The climbing of the part 21 can be suppressed. In addition, since the height of the second rib portion 32b is set to be slightly lower than the inner surface of the TFT substrate 24, the contact area between the outer edge portion of the panel portion 21 and the rib 32 is reduced. In addition, generation of dust due to rubbing between the panel portion 21 and the rib 32 can be suppressed.

  Although the height of the first rib portion 32a is set to be substantially the same as the outer surface of the counter substrate 25, only the TFT substrate 24 contacts the first rib portion 32a in the first outer edge portion 21a of the panel portion. Touch. For this reason, the contact area between the outer edge portion of the panel portion 21 and the rib 32 does not increase, and generation of dust due to friction between the panel portion 21 and the rib 32 can be suppressed. Therefore, it is possible to suppress the occurrence of dust due to the friction between the outer edge portion of the panel portion 21 and the rib 32 while suppressing the climbing of the panel portion 21 onto the rib 32.

  FIG. 6 is a perspective view showing a configuration corresponding to FIG. 5 for a liquid crystal display device according to a first modification of the first embodiment. In the liquid crystal display device 51, the corner portion 61 of the first rib portion 32a facing the panel portion 21 at the top of the rib 32 is rounded. The roundness of the corner portion 61 is set to such an extent that the panel portion 21 can be sufficiently prevented from climbing onto the first rib portion 32a. In addition, an inclined surface 62 is formed in the second rib portion 32b so as to be continuous with the upper portion of the position regulating wall 37 formed perpendicular to the in-plane direction of the panel portion 21 and away from the panel portion 21 toward the upper side. ing.

  In the liquid crystal display device 51 of this modification, the corner 61 of the first rib portion 32a is rounded and the inclined surface 62 is formed on the second rib portion 32b, so that the liquid crystal display panel on the backlight 11 is formed. 12 can be placed easily.

  By the way, in the part which opposes the boundary of the 1st outer edge part 21a and the 2nd outer edge part 21b, the 1st rib part 32a and the 2nd rib part 32b do not necessarily need to be comprised integrally. FIG. 7 is a perspective view showing a configuration corresponding to FIG. 5 for a liquid crystal display device according to a second modification of the first embodiment. In the liquid crystal display device 52, unlike the liquid crystal display device 51 shown in FIG. 6, the first rib portion 32 a and the second rib portion 32 b are separately formed at a portion indicated by reference numeral 63. When the size of the liquid crystal display panel 12 is small and its weight is relatively small, the generation of dust can be further suppressed by reducing the contact area between the outer edge portion of the panel portion 21 and the rib 32.

  Only the first rib portion 32a may be disposed at a portion facing the boundary between the first outer edge portion 21a and the second outer edge portion 21b. FIG. 8 is a perspective view showing a configuration corresponding to FIG. 5 for a liquid crystal display device according to a third modification of the first embodiment. In the liquid crystal display device 53, the second rib portion 23b of the rib 43 is not formed in the liquid crystal display device 51 shown in FIG. 6, but only the first rib portion 32a is formed. When the size of the liquid crystal display panel 12 is small and its weight is relatively small, the generation of dust can be further suppressed by reducing the contact area between the outer edge portion of the panel portion 21 and the rib 32.

  FIG. 9 is a cross-sectional view showing a configuration corresponding to FIG. 5 for a liquid crystal display device according to a fourth modification of the first embodiment. In the liquid crystal display device 54, in the liquid crystal display device 51 of FIG. 6, a wall surface 64 is formed continuously with the second rib portion 32b on the inclined surface 62 and parallel to the position regulating wall 37. Further, a flat surface 65 is formed continuously on the wall surface 64. The flat surface 65 is configured as the top of the second rib portion 32b. In the rib 43, the top of the first rib portion 32a and the top of the second rib portion 32b are continuously formed.

  In the liquid crystal display device 54 of this modification, the wall surface 64 is formed on the second rib portion 32b, so that the liquid crystal display panel 12 can be placed on the backlight 11 more easily.

  In 1st Embodiment and the 1st-4th modification, although the example which has arrange | positioned the rib 32 in the vicinity of the corner part of the panel part 21 was shown, the arrangement position of the rib 32 is not limited to these positions. FIGS. 10-12 is a top view which respectively shows the structure corresponded in FIG. 2 about the liquid crystal display device which concerns on the 5th-7th modification of 1st Embodiment. In the liquid crystal display device 55 of FIG. 10, the ribs 32 are continuously formed at the corner portions of the panel portion 21. In the liquid crystal display device 56 of FIG. 11, the rib 32 is formed continuously along each side of the panel unit 21 except for the portion on which the TCP 22 and the circuit board 23 are placed.

  In the liquid crystal display device 57 of FIG. 12, the rib 32 is continuous along the periphery of the panel portion 21 except for the portion where the TCP 22 and the circuit board 23 are placed and the vicinity of one corner portion of the panel portion 21. Is formed. Also in the liquid crystal display devices 55 to 57 shown in FIGS. 10 to 12, the height of the first rib portion 32 a is substantially the same as the outer surface of the counter substrate 25, as in the liquid crystal display device 10 of the embodiment. The height of the second rib portion 32 b is set to be slightly lower than the inner surface of the TFT substrate 24.

  FIG. 13A is a perspective view showing a configuration corresponding to FIG. 5 for a liquid crystal display device according to a second embodiment of the present invention. FIG.13 (b) has shown the cross section along the bb line of Fig.13 (a). The liquid crystal display device 70 is the same as the liquid crystal display device 10 shown in FIG. 5 except that the second rib portion 32 b is located between the position regulating wall 71 facing the outer edge of the counter substrate 25, and between the mounting surface 35 and the position regulating wall 71. It has a receding wall 72 formed. The receding wall 72 is formed at a position farther from the panel portion 21 than the position regulating wall 71.

  When viewed in the in-plane direction of the panel portion 21, the step between the position regulating wall 71 and the receding wall 72 is set to be sufficiently larger than the range of deviation between the outer edge of the TFT substrate 24 and the outer edge of the counter substrate 25. . The rib 32 shown with the code | symbol 73 is formed only in the part facing the 2nd outer edge part 21b of a panel part, and comprises the 2nd rib part 32b. The height of the lower edge portion of the position regulating wall 71 viewed from the mounting surface 35 is set higher than the bonding surface between the TFT substrate 24 and the counter substrate 25, for example, 0.9 mm, and the top of the second rib portion 32b. Is, for example, 1.6 mm.

  A corner portion of the upper portion of the rib 32 facing the panel portion 21 is rounded. In the liquid crystal display device 70 of the present embodiment, since only a part of the counter substrate 25 is in contact with the rib 32 at the second outer edge portion 21b of the panel portion, the panel portion 21 and the rib 32 are connected to each other as in the first embodiment. The contact area can be reduced, and the generation of dust can be reduced.

  FIG. 14A is a perspective view showing a configuration corresponding to FIG. 5 for a liquid crystal display device according to a third embodiment of the present invention. FIG. 14B shows a cross section taken along the line bb in FIG. In the liquid crystal display device 74, the second rib portion 32b in the liquid crystal display device 10 shown in FIG. 5 is a position restricting wall 71 facing the second outer edge portion 21b of the panel portion, and the surface of the position restricting wall 71. And a groove 75 extending at substantially the same height as the bonding surface between the TFT substrate 24 and the counter substrate 25. The rib 32 shown with the code | symbol 73 is formed only in the part facing the 2nd outer edge part 21b of a panel part, and comprises the 2nd rib part 32b.

  The height of the center position of the groove 75 as viewed from the mounting surface 35 is set to substantially the same height as the bonding surface between the TFT substrate 24 and the counter substrate 25, and is, for example, 0.7 mm. The width of the groove 75 is 0.4 mm, the depth is 0.3 to 0.5 mm, and the height of the top of the second rib portion 32b is, for example, 1.6 mm.

  In the liquid crystal display device 74 of the present embodiment, when the counter substrate 25 protrudes from the TFT substrate 24 at the second outer edge portion 21 b of the panel portion, only a part of the counter substrate 25 is higher than the groove 75. Touch the part. On the other hand, when the TFT substrate 24 protrudes from the counter substrate 25 at the second outer edge portion 21 b of the panel portion, only a part of the TFT substrate 24 comes into contact with the portion of the position regulating wall 71 lower than the groove 75. Therefore, in any case, as in the second embodiment, the contact area between the panel portion 21 and the rib 32 can be reduced, and the generation of dust can be reduced.

  In the liquid crystal display device 74 of the present embodiment, since the position is defined by the more protruding substrate of the TFT substrate 24 and the counter substrate 25, the positioning in the in-plane direction with respect to the outermost edge of the panel unit 21. Can be done. The contact area between the second outer edge portion 21b of the panel portion and the position regulating wall 71 can be adjusted by the height and width of the groove 75. 14B illustrates the groove 75 having a quadrangular cross-sectional shape, the cross-sectional shape of the groove 75 is not limited to this, and may be, for example, V-shaped, U-shaped, or semicircular. .

  FIG. 15 is a plan view showing a configuration corresponding to FIG. 4 for a liquid crystal display device according to a fourth embodiment of the present invention. The liquid crystal display device 80 has the same configuration as the conventional liquid crystal display device 100 shown in FIGS. 18 to 20 except that the shape of the ribs 32 formed on the backlight 11 is different. In the liquid crystal display device 80, the rib 32 is formed in a cylindrical shape extending in the vertical direction with respect to the surface of the panel unit 21.

  The height of the rib 32 is set to be substantially the same as the outer surface of the counter substrate 25. The cross section taken along line aa in FIG. 3 is the same as the cross section shown in FIG. 3A, and the cross section taken along line ee is the same as the cross section shown in FIG.

  According to the liquid crystal display device 80 of the present embodiment, the rib 32 is formed in a columnar shape extending in the vertical direction on the surface of the panel portion 21, thereby reducing the contact area between the outer edge portion of the panel portion 21 and the rib 32. And the generation of dust due to rubbing between the panel portion 21 and the rib 32 can be suppressed. Further, since the height of the top portion of the rib 32 is set to be substantially the same as the outer surface of the counter substrate 25, a step required for riding the panel portion 21 on the first rib portion 32a is provided. Enlargement of the panel portion 21 on the first rib portion 32 can be suppressed sufficiently.

  FIG. 16 is a plan view showing a configuration corresponding to FIG. 15 for a liquid crystal display device according to a first modification of the fourth embodiment. In the liquid crystal display device 81, the rib 32 has a plurality of protrusions 91 that protrude toward the panel portion 21 when viewed in the in-plane direction of the panel portion 21. The protrusions 91 are formed in a semicircular shape when viewed in the in-plane direction of the panel portion 21, and are periodically formed along the outer edge portion of the panel portion 21.

  The ribs 32 are formed in the same shape in the vertical direction in the in-plane direction of the panel portion 21, and the height of the ribs 32 is set to be substantially the same as the outer surface of the counter substrate 25. The cross section taken along line aa in FIG. 3 is the same as the cross section shown in FIG. 3A, and the cross section taken along line ee is the same as the cross section shown in FIG. In the liquid crystal display device 81 of the present modification, the reliability of the ribs 32 is improved compared to the liquid crystal display device 80 of the fourth embodiment by supporting the outer edge of the panel portion 21 with more ribs 32. It is increasing.

  FIG. 17 is a plan view showing a configuration corresponding to FIG. 15 for a liquid crystal display device according to a second modification of the fourth embodiment. In the liquid crystal display device 82, the protrusion 91 is formed in a V shape when viewed in the in-plane direction of the panel portion 21 in the liquid crystal display device 81 of FIG. In the liquid crystal display device 82 of this modification, the same effect as the liquid crystal display device 81 of the first modification can be obtained.

  In the liquid crystal display devices 80 to 82 shown in FIG. 15 to FIG. 17 as well, the height of the position regulating wall 37 is the same as in the first embodiment at the portion of the rib 32 facing the second outer edge portion 21b of the panel portion. The height may be set to be slightly lower than the inner surface of the TFT substrate 24, or the position regulating wall 71 facing the edge surface of the counter substrate 25 may be provided as in the second embodiment. By these, the contact area of the panel part 21 and the rib 32 can further be reduced, and generation | occurrence | production of dust can be reduced.

  Although the present invention has been described based on the preferred embodiment, the display device according to the present invention is not limited to the configuration of the above embodiment, and various modifications and changes can be made from the configuration of the above embodiment. The display device subjected to the above is also included in the scope of the present invention.

  A part or all of the above embodiments can be described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
In a display device comprising: a display panel; and a backlight having a mounting surface on which the display panel is mounted and a rib that protrudes from the mounting surface at an outer edge portion of the mounting surface to define an in-plane direction position of the display panel.
The display panel includes a lower substrate and an upper substrate that are sequentially stacked from the mounting surface and bonded to each other at a bonding surface, and an outer edge of the upper substrate is disposed inside an outer edge of the lower substrate. A first panel portion, and a second panel portion in which an outer edge of the upper substrate and an outer edge of the lower substrate are disposed substantially flush with each other,
The rib is opposed to the first panel portion, the first rib portion having a position-regulating wall formed with a projecting height exceeding the height of the joining surface, and opposed to the second panel portion. A display device comprising: a second rib portion having a position regulating wall which is disposed and has a projecting height equal to or less than a height of the joint surface.

(Appendix 2)
In a display device comprising: a display panel; and a backlight having a mounting surface on which the display panel is mounted and a rib that protrudes from the mounting surface at an outer edge portion of the mounting surface to define an in-plane direction position of the display panel.
The display panel includes a lower substrate and an upper substrate that are sequentially stacked from the mounting surface and bonded to each other at a bonding surface, and an outer edge of the upper substrate is disposed inside an outer edge of the lower substrate. A first panel portion, and a second panel portion in which an outer edge of the upper substrate and an outer edge of the lower substrate are disposed substantially flush with each other,
The rib is opposed to the first panel portion, the first rib portion having a position-regulating wall formed with a projecting height exceeding the height of the joining surface, and opposed to the second panel portion. A second rib portion having a position restricting wall disposed and having a projecting height equal to or lower than the height of the joint surface;
Of the four sides of the display panel formed in a rectangular shape, at least one of the first rib portion and the second rib portion is opposed to the side having both the first panel portion and the second panel portion. Each of the display devices is formed.

(Appendix 3)
The display device according to appendix 1 or 2, wherein the lower substrate is an active matrix substrate, and a TCP is connected on the active matrix substrate in the first panel portion.

(Appendix 4)
The ribs are individually arranged corresponding to the respective corner portions of the display panel formed in a rectangular shape, and the first rib portion and the second rib portion of each corner portion are separately provided. The display device according to any one of appendices 1 to 3, which is formed on the body.

(Appendix 5)
The ribs are individually arranged corresponding to the respective corner portions of the display panel formed in a rectangular shape, and at least a part of the individually arranged ribs is the first rib. The display device according to any one of appendices 1 to 3, wherein the portion and the second rib portion are integrally formed.

(Appendix 6)
The display device according to appendix 5, wherein the rib is divided in the vicinity of at least a part of a corner portion of the display panel.

(Appendix 7)
The display device according to any one of appendices 1 to 3, wherein the second rib portion is continuously formed on at least one side of the display panel formed in a rectangular shape.

(Appendix 8)
The display device according to any one of appendices 1 to 7, wherein the second rib portion has an inclined upper surface continuous from the position restriction wall.

(Appendix 9)
The display device according to any one of appendices 1 to 7, wherein the second rib portion has a flat upper surface continuous from the position restriction wall.

(Appendix 10)
In a display device comprising: a display panel; and a backlight having a mounting surface on which the display panel is mounted and a rib that protrudes from the mounting surface at an outer edge portion of the mounting surface to define an in-plane direction position of the display panel.
The display panel includes a lower substrate and an upper substrate that are sequentially stacked from the mounting surface and bonded to each other at a bonding surface, and an outer edge of the upper substrate is disposed inside an outer edge of the lower substrate. A first panel portion; and a second panel portion in which an outer edge of the upper substrate and an outer edge of the lower substrate are disposed substantially flush with each other,
The rib is opposed to the first panel portion, the first rib portion having a position-regulating wall formed with a projecting height exceeding the height of the joining surface, and opposed to the second panel portion. A second wall having a position restricting wall disposed opposite to the display panel at a portion exceeding the height of the joint surface and a receding wall formed at a height portion other than the position restricting wall and retreating from the position restricting wall; A display device comprising a rib portion.

(Appendix 11)
In a display device comprising: a display panel; and a backlight having a mounting surface on which the display panel is mounted and a rib that protrudes from the mounting surface at an outer edge portion of the mounting surface to define an in-plane direction position of the display panel.
The display panel is composed of a lower substrate and an upper substrate that are sequentially stacked from the mounting surface and bonded to each other at a bonding surface,
At least a part of the rib includes a rib portion having a position restricting wall facing the display panel and a groove retreating from the position restricting wall in the vicinity of the joint surface.

(Appendix 12)
In a display device comprising: a display panel; and a backlight having a mounting surface on which the display panel is mounted and a rib that protrudes from the mounting surface at an outer edge portion of the mounting surface to define an in-plane direction position of the display panel.
The display device, wherein the rib is formed along at least a part of an outer edge portion of the display panel, and has a plurality of protrusions protruding toward the outer edge portion of the display panel.

(Appendix 13)
The display device according to appendix 12, wherein the protrusion protrudes in an arc shape or a V shape along an extending direction of an outer edge portion of the display panel.

(Appendix 14)
14. The display device according to appendix 12 or 13, wherein the protrusions are periodically formed along an extending direction of an outer edge portion of the display panel.

  According to the display device according to supplementary note 1, the position restriction wall of the first rib portion has a protruding height that exceeds the height of the joint surface, so that the first panel portion rides on the first rib portion. Can be suppressed. In addition, since the position regulating wall of the second rib portion has a protruding height that is equal to or lower than the height of the joint surface, only a part of the outer edge of the lower substrate is in contact with the rib in the second panel portion. Accordingly, the contact area between the outer edge portion of the display panel and the rib can be reduced, and generation of dust due to friction between the display panel and the rib can be suppressed. Therefore, it is possible to suppress the generation of dust due to the friction between the display panel and the ribs while suppressing the display panel from climbing onto the ribs.

  According to the display device according to attachment 2, at least one of the four sides of the display panel formed in a rectangular shape is opposed to the side having both the first panel portion and the second panel portion. By forming each of the first rib portion and the second rib portion, for the side having both the first panel portion and the second panel portion, while suppressing the riding of the display panel on the rib, And generation | occurrence | production of the dust resulting from friction with a display panel and a rib can be suppressed.

  In the display device according to attachments 1 and 2, for example, the lower substrate is an active matrix substrate, and a TCP is connected to the active matrix substrate in the first panel portion.

  In the display device according to attachments 1 and 2, the ribs are individually arranged corresponding to the corner portions of the display panel formed in a rectangular shape, and the first ribs of the corner portions are provided. The portion and the second rib portion may be formed separately. Alternatively, each of the ribs individually disposed corresponding to each corner portion of the liquid crystal display panel formed in a rectangular shape is at least part of the first rib portion. And the second rib portion may be integrally formed.

  In the display device according to attachments 1 and 2, the rib may be divided in the vicinity of at least a part of the corner portion of the display panel. The second rib portion may be continuously formed on at least one side of the display panel formed in a rectangular shape.

  In a preferred aspect of the display device according to attachments 1 and 2, the second rib portion has an inclined upper surface continuous from the position regulating wall. The display device can be easily placed on the backlight. In the display device according to attachments 1 and 2, the second rib portion may have a flat upper surface continuous from the position restriction wall.

  According to the display device according to supplementary note 10, as in the display device according to supplementary note 1, the position regulating wall of the first rib portion has a protruding height exceeding the height of the joint surface, so that the first panel portion Can be prevented from climbing onto the first rib portion. In addition, the second rib portion is disposed so as to face the second panel portion, and the position restricting wall that faces the display panel at the portion exceeding the height of the joint surface and the height portion other than the position restricting wall In the second panel portion, only a part of the outer edge of the upper substrate comes into contact with the rib. Accordingly, the contact area between the outer edge portion of the display panel and the rib can be reduced, and generation of dust due to friction between the display panel and the rib can be suppressed. Therefore, similarly to the display device according to Supplementary Note 1, it is possible to suppress generation of dust due to rubbing between the display panel and the ribs while suppressing the climbing of the display panel on the ribs.

  According to the display device according to supplementary note 11, the rib portion has the position restriction wall facing the display panel side and the groove that recedes from the position restriction wall in the vicinity of the joint surface, whereby the upper substrate of the display panel Is protruding from the lower substrate, only a part of the outer edge of the upper substrate is in contact with the portion of the position regulating wall higher than the groove, and when the lower substrate of the display panel is protruding from the upper substrate, the lower substrate Only a part of the outer edge of the contact with the portion of the position regulating wall lower than the groove. Therefore, in any case, the contact area between the outer edge of the display panel and the rib can be reduced, and the generation of dust can be reduced.

  In the display device according to attachment 11, since the position is defined by the more protruding substrate of the lower substrate and the upper substrate, positioning in the in-plane direction can be performed with reference to the outermost edge of the display panel. . In the display device according to attachment 11, the rib portion may be configured as an entire rib in the display device. Further, the contact area between the outer edge portion of the second panel portion and the position regulating wall can be adjusted by the height and width of the groove.

  According to the display device according to attachment 12, the rib is formed along at least a part of the outer edge portion of the display panel, and has a plurality of protrusions protruding toward the outer edge portion of the display panel. The contact area between the outer edge portion of the panel and the rib can be reduced, and generation of dust due to rubbing between the display panel and the rib can be suppressed.

  In the display device according to attachment 12, the protrusion may protrude in an arc shape or a V shape along the extending direction of the outer edge portion of the display panel. The protrusions may be periodically formed along the extending direction of the outer edge of the display panel. The rib may be configured integrally with the mounting surface, or may be configured as a member different from the mounting surface.

10, 51 to 57, 70, 74, 80 to 82: Liquid crystal display device 11: Backlight 11a: Light emitting surface 12: Liquid crystal display panel 13: Shield front 13a: Display surface 21: Panel portion 21a: First outer edge portion 21b: Second outer edge 22: TCP
23: Circuit board 24: TFT substrate 25: Counter substrate 26, 27: Polarizing plate 28: Display area boundary 31: Backlight chassis 31a: Light emitting surface 32, 41-43: Rib 32a: First rib portion 32b: Second Rib portion 33: optical sheet 34: light guide plate 35: mounting surface 36: recess 37: position restricting wall 61: corner 62: inclined surface 63: part on backlight 64: wall 71: position restricting wall 72: retreating wall 73 : Rib 75: Groove 91: Projection

Claims (3)

In a display device comprising: a display panel; and a backlight having a mounting surface on which the display panel is mounted and a rib that protrudes from the mounting surface at an outer edge portion of the mounting surface to define an in-plane direction position of the display panel.
The display panel includes a lower substrate and an upper substrate that are sequentially stacked from the mounting surface and bonded to each other at a bonding surface, and an outer edge of the upper substrate is disposed inside an outer edge of the lower substrate. A first panel portion; and a second panel portion in which an outer edge of the upper substrate and an outer edge of the lower substrate are disposed substantially flush with each other.
At least a portion of the rib disposed to face the second panel portion has a position restricting wall facing the display panel and a groove that recedes from the position restricting wall in the vicinity of the joint surface. A display device comprising a portion.   The display device according to claim 1, wherein a cross-sectional shape of the groove is a substantially square shape, a substantially V shape, a substantially U shape, or a substantially semicircular shape.   The display device according to claim 1, wherein an upper edge of the groove is formed above the bonding surface, and a lower edge of the groove is formed flush with the mounting surface.

Images