JP5123078B2 - Liquid crystal display device and manufacturing method - Google Patents

Description

  The present invention relates to a curved liquid crystal display device used for a notebook type or desktop type personal computer, television, monitor or the like.

  With the progress of the information society, the use of liquid crystal display devices is diversified. Among them, a type with a curved display surface may be preferred. On the other hand, the curved liquid crystal display device shows a decrease in image quality as compared with a normal flat liquid crystal display device. The structure of a conventional flat liquid crystal display device is shown in FIG. As shown in FIG. 7, the conventional flat liquid crystal display device has a structure in which the liquid crystal panel 3 is disposed to face the backlight 1 and these are sandwiched by the front frame 9.

  FIG. 8 is an exploded perspective view of a conventional flat liquid crystal display device. As shown in FIG. 8, the liquid crystal panel 3 includes a TFT substrate 5 and a CF substrate 6 that are arranged to face each other. On the surface of the CF substrate 6 facing the TFT substrate 5, an R (red), G (green), and B (blue) colored layer 21 and a CF side BM (Black Matrix) 22 disposed therebetween are provided. The color filter 20 is formed. A TFT side BM 23 is formed between the pixels on the inner surface of the TFT substrate 5. Conventionally, excess light from the backlight 1 is shielded by the CF side BM 22 and the TFT side BM 23.

If the liquid crystal panel 3 is bent with this structure, the CF side BM 22 and the TFT side BM 23 are displaced, and light leakage of backlight light occurs. As described above, in a curved liquid crystal display device that is used by bending the liquid crystal panel 3, the image quality is deteriorated as compared with a normal flat liquid crystal display device. In order to solve such a problem, Patent Document 1 proposes a backlight having a concave shape.
JP 2007-1171681 A

  However, when the method of Patent Document 1 is used, a general-purpose backlight cannot be used, and the cost increases. As described above, there is no suitable curved liquid crystal display device that can achieve both improvement in image quality and cost reduction.

  The present invention has been made against the background of such circumstances, and an object of the present invention is to provide a curved liquid crystal display device that achieves both improvement in image quality and cost reduction.

A liquid crystal display device according to one embodiment of the present invention includes an element substrate including a plurality of pixels and a wiring portion that is formed between the plurality of pixels and drives the plurality of pixels, and is opposed to the element substrate. A liquid crystal panel in which liquid crystal is sandwiched between a pair of substrates including a counter substrate and a backlight disposed on the non-viewing side of the liquid crystal panel, and held in a curved state of the liquid crystal panel A device is formed corresponding to a region where a plurality of first light shielding portions provided perpendicularly to a bending direction between the pixels on the counter substrate side and the wiring portion of the element substrate are formed. comprising a second light-shielding portion that is, wherein the width of the first light-shielding portion of the backlight are inclined region inclined with respect to the exit surface of the liquid crystal panel, the exit surface of the backlight of the liquid crystal panel Formed in parallel regions Widely than the width of the first light-shielding portion, the first light-shielding portion of the inclined area, the central portion side of the liquid crystal panel of the second shielding portion formed in a substantially coincident position to the first shielding portion It spreads toward the outside from the end of the.

A manufacturing method of a liquid crystal display device according to one embodiment of the present invention includes an element substrate including a plurality of pixels and a wiring portion that is formed between the plurality of pixels and drives the plurality of pixels, and the element substrate. A liquid crystal panel in which liquid crystal is sandwiched between a pair of opposing substrates, and a backlight disposed on the non-viewing side of the liquid crystal panel, the liquid crystal panel being held in a curved state A method for manufacturing a liquid crystal display device, wherein a plurality of first light-shielding portions are provided between the pixels on the counter substrate side perpendicular to the bending direction, and the wiring portion of the element substrate is formed The second light-shielding portion is formed corresponding to the width of the first light-shielding portion in the inclined region inclined with respect to the light-emitting surface of the backlight of the liquid crystal panel. Formed in a parallel region approximately parallel to Wider than the width of the first light shielding portion which is, the first light-shielding portion of the inclined area, the central portion of the liquid crystal panel of the second shielding portion formed in a substantially coincident position to the first shielding portion and a step of holding a state where formed so as to spread outward from the end on the side, curved the liquid crystal panel on the viewing side of the backlight.

  According to the present invention, it is possible to provide a curved liquid crystal display device that achieves both improvement in image quality and cost reduction.

  Embodiments to which the present invention can be applied will be described below. The following description is to describe the embodiment of the present invention, and the present invention is not limited to the following embodiment. For clarity of explanation, the following description and drawings are omitted and simplified as appropriate.

Embodiment 1 FIG.
A liquid crystal display device according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a configuration of a liquid crystal display device 10 according to the present embodiment. 1A is a view of the liquid crystal display device 10 as viewed from the side surface, and FIG. 1B is a view of the liquid crystal display device 10 as viewed from the display surface side (the liquid crystal panel 3 side). In FIG. 1A, the lower side is the display surface side. FIG. 2 is an enlarged cross-sectional view of the liquid crystal display device 10 according to the present embodiment. A liquid crystal display device 10 according to the present invention is a curved liquid crystal display device including a liquid crystal panel 3 held in a curved state.

  As shown in FIG. 1, a liquid crystal display device 10 according to the present embodiment includes a backlight 1 and a liquid crystal panel 3. On the back side of the liquid crystal panel 3, a backlight 1 which is a planar light source device is disposed. As the backlight 1, a general configuration including a light source such as a fluorescent tube and an LED and a light guide plate that guides light from the light source in a planar shape, a diffusion sheet, a prism sheet, and the like can be used. The backlight 1 emits backlight light 2 that is substantially perpendicular to the planar emission surface 1a.

  The liquid crystal panel 3 is held in a curved state with respect to the emission surface 1 a of the backlight 1. In the present embodiment, the display surface of the liquid crystal panel 3 is an arcuate curved surface that protrudes toward the non-viewing side. The liquid crystal panel 1 displays an image based on the input display signal. As shown in FIG. 2, the liquid crystal panel 3 includes a polarizing plate 4, a TFT (Thin Film Transistor) substrate 5, a CF (Color Filter) substrate 6, a spacer material 7, a liquid crystal 8, and the like. The liquid crystal panel 3 has a configuration in which the liquid crystal 8 is sealed in a space between the TFT substrate 5, the CF substrate 6 disposed opposite to the TFT substrate 5, and a seal (not shown) for bonding them. A pair of substrates (TFT substrate 5 and CF substrate 6) constituting the liquid crystal panel 3 are transparent insulating substrates made of glass or the like. In the present embodiment, the TFT substrate 5 is disposed closer to the backlight 1 than the CF substrate 6.

  A gap between the TFT substrate 5 and the CF substrate 6 is maintained by the spacer material 7. The spacer material 7 is arranged so as to be distributed substantially uniformly in the display area. The spacer material 7 may be a bead spacer or a columnar spacer formed so as to protrude to a position corresponding to the CF side BM 22 of the color filter 20. Polarizing plates 4 are respectively attached to the outer surfaces of the TFT substrate 5 and the CF substrate 6.

  A plurality of gate lines and a plurality of source lines (not shown) are formed on the TFT substrate 5. In addition, a thin film transistor (TFT) is provided near the intersection of the gate line and the source line. A pixel electrode is formed in a region surrounded by adjacent gate lines and source lines. A region surrounded by adjacent gate lines and source lines is a pixel. Pixels are arranged in a matrix on the TFT substrate 5. A region where a plurality of pixels are formed becomes a display region. A TFT side BM23 is provided between a plurality of pixels arranged in a matrix, and the TFT side BM23 has a lattice shape.

  On the CF substrate 6, a common electrode (not shown), a colored layer 21 of R (red), G (green), and B (blue), a color filter 20 including a CF side BM 22, and the like are formed. The common electrode is actually a transparent electrode formed on the substantially entire surface of the CF substrate 6 so as to face the pixel electrode. As the common electrode, a transparent conductive film such as ITO (Indium Tin Oxide) can be used. An electric field is applied to the liquid crystal 8 by applying a voltage to the liquid crystal 8 between the pixel electrode and the common electrode.

  A colored layer 21 of each color is formed on the common electrode corresponding to the pixels on the TFT substrate 5. A CF-side BM 22 that is a light shielding part is disposed between the colored layers 21. The CF side BM 22 is formed at a substantially constant pitch in the bending direction of the liquid crystal panel 3 and the direction perpendicular thereto, and has a lattice shape. Of the CF side BM 22, a light shielding part formed perpendicular to the bending direction of the liquid crystal panel 3 is defined as a vertical BM 22 a, and a light shielding part formed parallel to the bending direction is defined as a horizontal BM 22 b. The CF side BM22 and the TFT side BM23 are formed to face each other.

  As shown in FIG. 1B, in the present embodiment, the left and right ends are arranged so as to be farther from the backlight 1 than the central portion of the liquid crystal panel 3. The left-right direction in which the liquid crystal panel 3 is bent is defined as a bending direction. The liquid crystal panel 3 is disposed substantially parallel to the portion of the liquid crystal panel 3 that is inclined with respect to the emission surface 1 a of the backlight 1 (referred to as region A (inclined region)) and the emission surface 1 a of the backlight 1. Part (referred to as region B (parallel region)). In the region B, the backlight light 2 from the backlight 1 enters the liquid crystal panel 3 substantially perpendicularly. On the other hand, in the region A, the backlight light 2 from the backlight 1 is incident on the liquid crystal panel 3 obliquely.

  In the present embodiment, the width of the vertical BM 22 a provided perpendicular to the bending direction of the liquid crystal panel 3 is formed so that the region A is wider than the region B. Further, the width of the vertical BM 22a becomes wider from the central part of the liquid crystal panel 3 toward the peripheral part. Accordingly, the interval between the vertical BMs 22 a adjacent to each other in the bending direction becomes narrower toward the peripheral edge of the liquid crystal panel 3. In other words, as the angle between the liquid crystal panel 3 and the exit surface of the backlight 1 increases, the width of the vertical BM 22a increases. Note that the width of the horizontal BM 22b provided in parallel to the bending direction of the liquid crystal panel 3 is substantially constant in the regions A and B.

  Conventionally, when a liquid crystal panel is curved, there is a problem in that light leakage occurs and image quality deteriorates. However, when a curved liquid crystal display device having a configuration as in the present invention is used, even when a general flat backlight 1 is used, a curved liquid crystal display device capable of suppressing image quality deterioration due to light leakage and capable of displaying a good image. Can be obtained.

  Here, the operation of the liquid crystal display device 10 according to the present embodiment will be described with reference to FIG. As a result of various studies on the cause of image quality degradation when a normal flat backlight is used in a curved liquid crystal display device, the present inventor has found that the following is the cause. As shown in FIG. 3, when the liquid crystal panel 3 is curved, the backlight light 2 from the backlight 1 is obliquely irradiated in the region A inclined with respect to the emission surface 1 a of the backlight 1. . In the normal liquid crystal panel 3, there is a domain 11 in which an alignment abnormality that is not controlled by an electric field from the pixel electrode is generated due to a potential leak caused by wiring between the pixel electrodes.

  The domain 11 is a region where light transmission control is not performed normally and light leakage of the backlight light 2 occurs. In addition, the influence of potential leakage due to wiring between pixel electrodes or the like extends over a certain range in a direction substantially perpendicular to the CF substrate from the TFT substrate on the region where the wiring or the like is formed. Therefore, the domain 11 includes a region from the TFT substrate to the vicinity of the CF substrate in a substantially vertical direction on the region where the wiring between the pixels is formed. For this reason, a light shielding layer (BM) is usually provided on the TFT substrate 5 or the CF substrate 6 to prevent adverse effects on the display.

  However, when the backlight 2 is irradiated obliquely by bending the liquid crystal panel 3, the domain 11 that should have been shielded by the light-shielding layer in the case of normal vertical incidence is obliquely crossed. Light leakage will occur. Further, in the portion where the degree of curvature of the liquid crystal panel 3 becomes large, the positional deviation between the TFT substrate 5 and the CF substrate 6 becomes large. In this case, the TFT side BM23 and the CF side BM22 which are light shielding layers provided on the TFT substrate 5 and the CF substrate 6 do not overlap each other, and a deviation occurs. Such a BM shift further promotes the occurrence of light leakage from the domain 11 that should be shielded from light by the BM. As described above, in the curved liquid crystal display device, in the region where the liquid crystal panel 3 is inclined with respect to the emission surface 1a of the backlight 1, the image quality is significantly deteriorated as compared with the flat liquid crystal display device.

  As described above, in a curved liquid crystal display device using a conventional flat backlight 1 and having a curved liquid crystal panel, image quality deteriorates. On the other hand, when the configuration of the first embodiment is used, in the region A where the liquid crystal panel 3 is inclined with respect to the emission surface 1a of the backlight 1 described in FIG. Light leakage caused by crossing the light beam can be shielded by the thick vertical BM 22a shown in FIG. Thereby, it is possible to obtain a curved liquid crystal display device capable of suppressing image quality degradation due to light leakage and capable of displaying a good image.

  Next, the width of the vertical BM 22a will be described with reference to FIG. The width of the vertical BM 22 in the center (region B) of the liquid crystal panel 3 that is substantially parallel to the backlight 1 is d, and the inter-substrate gap (distance between the TFT substrate 5 and the CF substrate 6) is G. Further, an angle formed by the direction of the emission surface 1a of the backlight 1 and the surface direction of the liquid crystal panel 3 is defined as θ. That is, θ is an angle at which the liquid crystal panel 3 is inclined with respect to the emission surface 1 a of the backlight 1. In the present embodiment, it is assumed that the width of the TFT side BM23 on the TFT substrate 5 side is substantially constant and is equal to the width of the vertical BM22 in the region B and d. In the region A, the ends of the liquid crystal panel 3 of the TFT side BM 23 and the vertical BM 22 a formed perpendicular to the bending direction are substantially in the direction perpendicular to the TFT substrate 5 and the CF substrate 6. Assume that they match.

  From FIG. 3, it can be estimated that the portion projected by the backlight 2 on the color filter 20 in the domain 11 is a portion affected by the domain 11. Therefore, the width of the vertical BM 22a can be determined so that at least this portion can be shielded from light. In the present embodiment, the width D of the vertical BM 22a in the region A is a tangent multiple (tan θ) (D) of the angle (θ) at which the liquid crystal panel 3 of the inter-substrate gap G is inclined with respect to the emission surface 1a of the backlight 1. = G × tan θ). That is, in the present embodiment, the width Δd that is wider than the width of the vertical BM 22a of the region B of the vertical BM 22a in the region A is Δd = G × tan θ−d. In addition, the vertical BM 22a in the region A spreads in a direction away from the center side end of the liquid crystal panel 3 of the TFT BM 23 and the vertical BM 22a that are substantially coincident. That is, the vertical BM 22a spreads so as to cover the portion projected by the backlight 2 on the color filter 20 in the domain 11. Accordingly, light can be continuously shielded from the end of the CF side BM to the end of the TFT side BM23, and light leakage can be reliably prevented.

  In the present embodiment, the example in which the TFT side BM 23 serving as the light shielding portion is provided also on the TFT substrate 5 side has been described. In the case where the TFT side BM23 is not provided and the CF side BM22 is provided only on the CF substrate 6 side to shield the light, there is a portion where the domain 11 where light leakage occurs is not shielded. In this case, the vertical BM 22a needs to be further widened by the width of the TFT side BM23. That is, the width of the vertical BM 22a in the region A is set to D = G × tan θ + d. That is, the width Δd that is wider than the width of the vertical BM 22a of the region B of the vertical BM 22a in the region A is Δd = G × tan θ. In the liquid crystal display device 10 using the liquid crystal panel 3 having such a configuration, even when a general flat backlight 1 is used, deterioration in image quality due to light leakage is suppressed and good image display is realized. be able to.

  Further, with respect to the deviation between the normal CF side BM 22 and the TFT side BM 23, the normal BM width d is designed in consideration of the overlay variation and the finished BM width variation during manufacturing. Furthermore, as described above, since the width of the vertical BM 22a in the region A is widened, the manufacturing yield can be stably improved without causing manufacturing defects due to light leakage even with respect to manufacturing variations. Can do.

  In the region A inclined with respect to the emission surface 1 a of the backlight 1, the aperture ratio decreases due to the wide width of the vertical BM 22 a that is the light shielding layer. Usually, in a curved display device, the intensity of the backlight light changes depending on the viewing direction, and it is also affected by the reflected light. There are many cases. However, particularly in applications where the variation in in-plane brightness distribution is severe, the amount of light increases as the angle of inclination with respect to the exit surface 1a of the backlight 1 increases, so as to compensate for the decrease in light amount due to a decrease in aperture ratio. A rising backlight can be used. Further, a filter having a higher transmittance may be provided between the backlight 1 and the liquid crystal panel 3 as the angle inclined with respect to the emission surface 1 a of the backlight 1 is larger. Thereby, although there are disadvantages such as reduction in power consumption and light utilization efficiency, it is possible to obtain a display with uniform brightness.

Embodiment 2. FIG.
A liquid crystal display device according to Embodiment 2 of the present invention will be described with reference to FIGS. FIG. 4 is a diagram showing a configuration of the liquid crystal display device 10 according to the present embodiment. 4A is a view of the liquid crystal display device 10 as viewed from the side surface, and FIG. 4B is a view of the liquid crystal display device 10 as viewed from the display surface side (the liquid crystal panel 3 side). In FIG. 4A, the lower side is the display surface side. FIG. 5 is an enlarged cross-sectional view of the liquid crystal display device 10 according to the present embodiment. 4 and 5, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted.

  A liquid crystal display device 10 according to the present invention is a curved liquid crystal display device including a liquid crystal panel 3 held in a curved state. In the present embodiment, the display surface of the liquid crystal panel 3 is an arcuate curved surface projecting to the non-viewing side. Further, the TFT substrate 5 of the liquid crystal panel 3 is disposed on the non-viewing side, and the CF substrate 6 is disposed on the viewing side. That is, the surface of the TFT substrate 5 on which the TFT side BM 23 is formed is concave, and the surface of the CF substrate 6 on which the colored layer 21, the CF side BM 22 and the like are formed is convex. Here, it is assumed that the TFT substrate 5 and the CF substrate 6 are curved with substantially the same curvature. In the present embodiment, the liquid crystal panel 3 is formed between the colored layers 21 of the CF substrate 6 arranged on the convex surface in order to alleviate the pixel displacement between the TFT substrate 5 and the CF substrate 6 when the liquid crystal panel 3 is bent. The pitch of the vertical BM 22a is adjusted.

  As shown in FIG. 4B, in the present embodiment, the pitch of the vertical BM 22a provided perpendicular to the bending direction of the liquid crystal panel 3 is larger in the region A than in the region B. Further, the formation interval of the vertical BMs 22a is widened from the central part toward the peripheral part in the bending direction of the liquid crystal panel 3. That is, as the angle between the liquid crystal panel 3 and the emission surface 1a of the backlight 1 increases, the pitch of the vertical BMs 22a increases. Accordingly, the width of the colored layer 21 of the CF substrate 6 in the bending direction increases as it goes toward the peripheral edge of the CF substrate 6. Note that the widths of the vertical BMs 22a are substantially equal. Further, the horizontal BMs 22 b provided in parallel to the bending direction of the liquid crystal panel 3 are formed at a substantially constant pitch in the regions A and B.

  As shown in FIG. 5, the formation interval of the vertical BM 22a is designed so that the light shielding region on the CF side BM 22 and the light shielding region on the TFT side BM 23 overlap with each other in the vertical direction in a state where the liquid crystal panel 3 is curved. Has been. Here, when the vertical BM 22a and the TFT side BM 23 are projected in the vertical direction with respect to the CF substrate 6 with the liquid crystal panel 3 being curved, the end of the CF side BM 22 on the center side of the liquid crystal panel 3 It is designed so that the end portion of the TFT side BM 23 substantially coincides. As a result, light leakage due to deviation of the light shielding regions of the CF substrate 6 and the TFT substrate 5 due to the curvature of the liquid crystal panel 3 can be eliminated. For this reason, even if the peripheral part of the liquid crystal panel 3 is viewed from an oblique direction with respect to the backlight light 2, it is possible to suppress a decrease in display quality.

  In this embodiment, the example in which the TFT side BM 23 is provided on the TFT substrate 5 side has been described, but the present invention is not limited to this. When the CF side BM 22 is provided only on the CF substrate 6 side, when the wiring formation region between the pixels on the TFT side BM 23 is projected in a direction perpendicular to the CF substrate 6, the end of the CF side BM 22 is The formation interval of the vertical BMs 22a can be adjusted so as to substantially coincide with the end of the wiring formation region between the pixels on the TFT side BM23. Further, when the display surface of the liquid crystal panel 3 is curved in the opposite direction so as to form an arcuate curved surface projecting to the viewing side, the light shielding region on the CF side BM22 and the light shielding region on the TFT side BM23 are appropriately provided on the substrate surface. The formation interval of the vertical BMs 22a is adjusted so as to overlap in the vertical direction.

  Of course, as in the first embodiment, in the region A inclined with respect to the emission surface 1a of the backlight 1 of the liquid crystal panel 3, it can be combined with the configuration in which the width of the vertical BM 22a is widened. When combined with the configuration of the first embodiment, the liquid crystal panel 3 is placed in a curved state so that one end face of the CF side BM 22 and the TFT side BM 23 are aligned with each other, and the BM 22a is perpendicular to the direction in which the domain 11 can shield light. It is desirable to widen the width. As a result, it is possible to reliably prevent light leakage caused by bending the liquid crystal panel 3, and to further improve the image quality.

Embodiment 3 FIG.
A liquid crystal display device according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view showing the configuration of the liquid crystal display device 10 according to the present embodiment. Note that here, a TFT liquid crystal display device is described as an example. As shown in FIG. 6, the liquid crystal display device 200 includes a liquid crystal panel 240 including a switching element substrate 210, a color filter substrate 220, and a liquid crystal 230. The liquid crystal 230 is filled between the switching element substrate 210 and the color filter substrate 220. A space between the switching element substrate 210 and the color filter substrate 220 is maintained by a spacer (not shown). A backlight 1 serving as a light source is provided on the non-viewing side of the liquid crystal panel 240. In the present embodiment, the liquid crystal panel 240 is curved in the opposite direction to the first and second embodiments, that is, in the direction in which the color filter substrate 220 side is convex.

  The switching element substrate 210 includes a glass substrate 211, an alignment film 212, a pixel electrode 213, a switching element 214, an insulating film 215, a terminal 216, a transfer electrode 217, and the like. On one surface of the glass substrate 211, a switching element 214 made of TFT and a wiring (not shown) for supplying a signal to the switching element 214 are formed. An insulating film 215 is formed on the switching element 214 and the wiring so as to cover them. A pixel electrode 213 is connected to the switching element 214. The voltage supplied to the pixel electrode 213 is controlled by the switching element 214. The pixel electrode 213 applies a voltage for driving the liquid crystal 230. A region where a plurality of pixel electrodes 213 are formed is a display region.

  An alignment film 212 for aligning the liquid crystal 230 is formed on the upper layer of the pixel electrode 213. Terminals 216 and transfer electrodes 217 are formed at the end of the glass substrate 211. The terminal 216 receives a signal supplied to the switching element 214 from the outside. The transfer electrode 217 transmits a signal input from the terminal 216 to a common electrode formed on the color filter substrate 220 side. In the present embodiment, unlike the first and second embodiments, the switching element substrate 210 side is not particularly provided with a light shielding portion. A polarizing plate 231 is provided on the other surface of the glass substrate 211.

  The color filter substrate 220 includes a glass substrate 221, an alignment film 222, a common electrode 223, a colored layer 224, a light shielding layer 225, and the like. A color filter including a colored layer 224 and a light shielding layer 225 is formed on the glass substrate 221. The light shielding layer 225 is provided between the colored layers 224 and in a peripheral region surrounding the display region. A common electrode 223 is formed on the coloring layer 224 and the light shielding layer 225. The common electrode 223 generates an electric field between the pixel electrode 213 formed on the switching element substrate 210 and drives the liquid crystal 230. An alignment film 222 for aligning the liquid crystal 230 is formed on the common electrode 223.

  As described in the first embodiment, the width of the light shielding layer 225 in the region inclined with respect to the emission surface 1a of the backlight 1 is wider than the width of the light shielding layer 225 in the region parallel to the emission surface 1a. Yes. In addition, the liquid crystal panel 240 having the gap G between the switching element substrate 210 and the color filter substrate 220 has a width parallel to the emission surface 1a, that is, the width of the light shielding layer 225 provided in the center of the liquid crystal panel 240 is d. It is widened by a tangent (tan θ) times (Δd = G × tan θ) of an angle θ inclined with respect to the emission surface 1 a of the backlight 1. That is, the width D of the light shielding layer 225 in the region inclined with respect to the emission surface 1a of the backlight 1 is D = G × tan θ + d.

  Further, as in the second embodiment, the amount of deviation from the region where the wiring between the pixels of the TFT substrate 5 of the CF-side BM 22 is generated by bending the liquid crystal panel 240 is estimated in advance, and this amount of deviation is estimated. The formation interval of the light shielding layer 225 is changed so as to relax the above. That is, the light shielding layer 225 is disposed so as to shield the domain in the vicinity of the wiring between the pixel electrodes 213. A polarizing plate 232 is provided on the other surface of the glass substrate 221. As the polarizing plate 232, a polarizing plate made of the same material as the polarizing plate 231 is used.

  Further, the switching element substrate 210 and the color filter substrate 220 are bonded together via a seal 233. Further, the transfer electrode 217 and the common electrode 223 are electrically connected by a transfer material 234, and a signal input from the terminal 216 is transmitted to the common electrode 223. The liquid crystal display device 200 includes a control board 235 and an FFC (Flexible Flat Cable) 236. The control board 235 generates a drive signal for the liquid crystal panel 240. The FFC 236 electrically connects the control board 235 to the terminal 216.

  The liquid crystal display device 200 operates as follows. For example, when a drive signal is input from the control substrate 235, a drive voltage is applied to the pixel electrode 213 and the common electrode 223. The direction of the molecules of the liquid crystal 230 changes according to the applied drive voltage. The light emitted from the backlight is transmitted or blocked outside through the switching element substrate 210, the liquid crystal 230, and the color filter substrate 220, so that an image or the like is displayed on the liquid crystal display device 200.

  The liquid crystal display device 200 is an example and may have other configurations. The operation mode of the liquid crystal display device 200 may be a TN (Twisted Nematic) mode, an STN (Supper Twisted Nematic) mode, a ferroelectric liquid crystal mode, or the like. The driving method may be a simple matrix or an active matrix. Further, a common electrode 223 provided on the color filter substrate 220 is installed on the switching element substrate 210 side, and a liquid crystal display device using a horizontal electric field method in which an electric field is applied to the liquid crystal 230 in the horizontal direction between the pixel electrodes 213. But it ’s okay.

  Next, a manufacturing method of the liquid crystal display device according to the third embodiment will be described. Here, a case where a plurality of liquid crystal cells are formed on one mother substrate will be described, but individual liquid crystal cells can also be formed separately. The manufacturing method of the switching element substrate 210 and the color filter substrate 220, which are substrates for the liquid crystal display device, will be briefly described because a general method is used. The switching element substrate 210 is formed on one surface of the glass substrate 211 by repeatedly using a pattern formation process such as film formation, patterning by photolithography, and etching to switch the switching element 214, the pixel electrode 213, the terminal 216, and the transfer electrode 217. It is manufactured by forming.

  Similarly, the color filter substrate 220 has a light shielding layer made of a colored layer 224, a common electrode 223 made of ITO as a transparent electrode, a resin material in which a metal film or a black pigment is dispersed, etc. on one surface of the glass substrate 221. Manufactured by forming 225. Here, regarding the light shielding layer 225, as described above, the region where the width of the light shielding layer 225 formed perpendicular to the bending direction is inclined with respect to the emission surface 1a of the backlight 1 is more parallel. It is formed so as to be wider than a region. In addition, the light shielding layer 225 is formed at a formation interval that reduces the amount of deviation from the region where the wiring between the pixels of the TFT substrate 5 of the CF-side BM 22 is generated by bending the liquid crystal panel 240.

  Next, an assembly process of the liquid crystal display device 200 will be described with reference to FIG. FIG. 7 is a flowchart for explaining a method of manufacturing liquid crystal display device 200 according to the present embodiment. First, in the substrate cleaning process, the switching element substrate 210 on which the pixel electrode 213 is formed is cleaned (S1). Next, in the alignment film material application step, an organic film made of polyimide, which is a material of the alignment film 212, is applied to one surface of the switching element substrate 210 by, for example, a printing method, and is baked and dried by a hot plate or the like ( S2). Thereafter, an alignment process is performed on the switching element substrate 210 coated with the alignment film material to form an alignment film 212 (S3).

  Similarly to S1 to S3, the alignment film 222 is formed on the color filter substrate 220 on which the common electrode 223 is formed by washing, applying an organic film, and alignment treatment. Subsequently, in a seal coating process for forming a seal pattern, a seal 233 is coated on one surface of the switching element substrate 210 or the color filter substrate 220 using seal printing (S4). For the seal 233, for example, a thermosetting resin such as an epoxy adhesive or an ultraviolet curable resin can be used.

  Next, in the transfer material application process, the transfer material 234 is applied to one surface of the switching element substrate 210 or the color filter substrate 220 (S5). In the spacer spraying step, spacers are sprayed on one surface of the switching element substrate 210 or the color filter substrate 220 (S6). This step is performed, for example, by dispersing the spacers by a wet method or a dry method. This step can be omitted by forming a protruding column spacer for determining the distance between the substrates in advance on one surface of the switching element substrate 210 or the color filter substrate 220.

  Thereafter, in the bonding step, the switching element substrate 210 and the color filter substrate 220 are bonded together (S7). Subsequently, in the seal curing step, the seal 233 is completely cured with the switching element substrate 210 and the color filter substrate 220 bonded together (S8). This step is performed, for example, by applying heat according to the material of the seal 233 or by irradiating ultraviolet rays. Note that the seal 233 has a pattern shape having a liquid crystal injection port for injecting the liquid crystal 230 in a later liquid crystal injection process.

  Next, in order to obtain a curved liquid crystal display device, a thinning polishing process is performed to scrape the glass substrate 211 and the glass substrate 221 so as to facilitate the bending (S9). This step is performed, for example, by scraping the glass substrate surface by chemical polishing using a chemical solution or physical polishing rubbing with a polishing material.

  Next, in the cell dividing step, the bonded substrates are disassembled into individual cells (S10). In the liquid crystal injection step, liquid crystal is injected from the liquid crystal injection port (S11). This step is performed, for example, by filling the liquid crystal 230 by vacuum injection from the liquid crystal injection port. Further, in the sealing step, the liquid crystal inlet is sealed (S12). This step is performed, for example, by sealing with a photocurable resin and irradiating with light. The liquid crystal panel 240 is manufactured as described above.

  About the process from bonding of the above S7-S12 to liquid crystal sealing, the liquid crystal injection method from a normal liquid crystal injection port was demonstrated as an example. However, a so-called drop injection method may be used as another liquid crystal injection method. In the dropping injection method, for example, the seal 233 has a pattern shape without an injection port, and the liquid crystal 230 is dropped on the switching element substrate 210 or the color filter substrate 220 in a droplet state. Then, after the switching element substrate 210 and the color filter substrate 220 are bonded together so as to sandwich the dropped liquid crystal 230, the seal 233 is cured.

  Subsequently, polarizing plates 231 and 232 are attached to the liquid crystal panel 240 manufactured up to S12 (S13). With respect to the step of bending the liquid crystal panel 240, for example, the step of attaching the polarizing plates 231 and 232 in S13 can be held in a curved state while the liquid crystal panel 240 is bent in one direction. In addition, by attaching the polarizing plate 231 on the concave side in a curved state in a state of being heated and expanded, the bending can be held by contraction of the polarizing plate 231. Furthermore, a method of holding the liquid crystal panel 240 in a curved state when it is housed in the housing after the polarizing plate attaching step S13 may be used. Finally, in the control board mounting process, the liquid crystal display device 200 is completed by mounting the control board 235 (S14).

  Also in the liquid crystal display device 200 according to the third embodiment described above, the width of the vertical BM 22a in the region inclined with respect to the emission surface 1a of the backlight 1 as in the first embodiment is widened. By shifting the position where the vertical BM 22a is formed as described above, it is possible to prevent light leakage of backlight light, which is a cause of deterioration in image quality of the curved liquid crystal display device, and to improve image quality. The liquid crystal panel 3 may be curved in a convex shape toward the backlight 1 or may be curved in a concave shape. There may be a plurality of curved portions.

1 is a diagram illustrating a configuration of a liquid crystal display device according to Embodiment 1. FIG. 4 is a cross-sectional view showing a part of the configuration of the liquid crystal display device according to Embodiment 1. FIG. FIG. 5 is a diagram for explaining the operation of the liquid crystal display device according to the first embodiment. 6 is a diagram showing a configuration of a liquid crystal display device according to Embodiment 2. FIG. 6 is a cross-sectional view showing a part of the configuration of a liquid crystal display device according to Embodiment 2. FIG. 6 is a diagram showing a configuration of a liquid crystal display device according to Embodiment 3. FIG. 10 is a flowchart for explaining a method of manufacturing the liquid crystal display device according to the third embodiment. It is a figure which shows the structure of the conventional flat liquid crystal display device. It is a disassembled perspective view for demonstrating the structure of the conventional flat liquid crystal display device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Backlight 1a Output surface 2 Backlight 3 Liquid crystal panel 4 Polarizing plate 5 TFT substrate 6 CF substrate 7 Spacer material 8 Liquid crystal 9 Front frame 10 Liquid crystal display device 20 Color filter 21 Colored layer 22 CF side BM
22a Vertical BM
22b Horizontal BM
23 TFT side BM
200 Liquid crystal display device 210 Switching element substrate 211 Glass substrate 212 Alignment film 213 Pixel electrode 214 Switching element 215 Insulating film 216 Terminal 217 Transfer electrode 220 Color filter substrate 221 Glass substrate 222 Alignment film 223 Common electrode 224 Colored layer 225 Light shielding layer 230 Liquid crystal 231 Polarizer 232 Polarizer 233 Seal 234 Transfer material 235 Control board 236 FFC
240 LCD panel

Claims (10)

Liquid crystal between a pair of substrates comprising an element substrate comprising a plurality of pixels and a wiring portion formed between the pixels for driving the pixels, and a counter substrate disposed opposite to the element substrate. A liquid crystal panel sandwiched between and a backlight disposed on the non-viewing side of the liquid crystal panel,
A liquid crystal display device held in a curved state of the liquid crystal panel,
A plurality of first light-shielding portions provided perpendicularly to the bending direction between the pixels on the counter substrate side ;
A second light shielding portion formed corresponding to a region where the wiring portion of the element substrate is formed;
With
The width of the first light-shielding portion of the inclined region inclined with respect to the emission surface of the backlight of the liquid crystal panel is the first region formed in a parallel region substantially parallel to the emission surface of the backlight of the liquid crystal panel. widely than the width of the light-shielding portion,
The first light shielding portion of the inclined area extends outward from an end portion of the liquid crystal panel on the liquid crystal panel side of the second light shielding portion, which is formed at a position substantially coinciding with the first light shielding portion. A liquid crystal display device.   2. The liquid crystal display device according to claim 1, wherein a width of the first light-shielding portion in the inclined region is determined according to an angle inclined with respect to an emission surface of the backlight of the liquid crystal panel. .   The width of the first light shielding part in the inclined area is calculated using a distance between the pair of substrates and an angle inclined with respect to an emission surface of the backlight of the liquid crystal panel. The liquid crystal display device according to claim 1. Wherein said first light-shielding portion of the inclined area, according to claim 1 to 3 which is formed an orientation abnormal area on the wiring portion so as to cover the substantially entire projected areas on the counter substrate side by the light from the backlight The liquid crystal display device according to any one of the above. The width of the first light-shielding portion of the inclined area, the amount Δd to wider than the width of the formed parallel region the first light blocking section may be any of claims 1-4, which is calculated by the following formula 2. A liquid crystal display device according to item 1.
Δd = G × tan θ
Here, G is a gap between the pair of substrates, and θ is an angle inclined with respect to the emission surface of the backlight of the liquid crystal panel. Wherein said first light-shielding portion of the inclined area, the liquid crystal display device according to any one of claims 1 to 5, which is formed at a position corresponding to a region obtained by projecting perpendicularly the wiring part with respect to the counter substrate . A region obtained by projecting the first light-shielding portion and the second light-shielding portion of the inclined region onto the counter substrate with light from the backlight projects a misalignment region on the wiring portion onto the counter substrate side. The liquid crystal display device according to claim 1 , wherein the liquid crystal display device is formed so as to cover substantially the whole. The liquid crystal display device according to claim 7 , wherein a width D of the first light shielding portion in the inclined region is calculated by the following formula.
D = G × tan θ
Here, G is a gap between the pair of substrates, and θ is an angle inclined with respect to the emission surface of the backlight of the liquid crystal panel. 9. The liquid crystal display device according to claim 7 , wherein a position of the first light shielding portion in the inclined region is formed at a position corresponding to a region obtained by projecting the second light shielding portion perpendicularly to the counter substrate. Liquid crystal between a pair of substrates comprising an element substrate comprising a plurality of pixels and a wiring portion formed between the pixels for driving the pixels, and a counter substrate disposed opposite to the element substrate. A liquid crystal panel sandwiched between and a backlight disposed on the non-viewing side of the liquid crystal panel,
A method of manufacturing a liquid crystal display device in which the liquid crystal panel is held in a curved state,
A plurality of first light shielding portions are provided between the pixels on the counter substrate side perpendicularly to the bending direction,
Forming a second light-shielding portion corresponding to a region where the wiring portion of the element substrate is formed;
The width of the first light-shielding portion of the inclined area inclined with respect to the emission surface of the backlight of the liquid crystal panel is formed in a parallel region substantially parallel to the emission surface of the backlight of the liquid crystal panel. An end portion of the liquid crystal panel side of the second light- shielding portion that is wider than one light-shielding portion and is formed at a position where the first light-shielding portion of the inclined region substantially coincides with the first light-shielding portion. From the outside to the outside,
Holding the liquid crystal panel in a curved state on the viewing side of the backlight ;
A method for manufacturing a liquid crystal display device.