JP5586541B2 - Liquid crystal display - Google Patents

Description

  The present invention relates to a liquid crystal display device, and more particularly to a flexible liquid crystal display device capable of display in a curved state.

A liquid crystal display device is a flat display device that is most used in portable information devices such as personal computers, taking advantage of the features of light weight, thinness, and low power consumption.
As is well known, a liquid crystal display device is formed by bonding an array substrate having pixel electrodes and a color filter substrate having a common electrode to each other, and filling a liquid crystal between the pair of substrates, and a voltage between the pixel electrode and the common electrode. Is a display device that controls the transmittance of light passing through the liquid crystal by changing the molecular orientation direction of the liquid crystal by applying.

  In recent years, it has been required from a design aspect to display a liquid crystal display device by bending (curving) a flat substrate of such a liquid crystal display device to an arbitrary curvature. In response to such demands, there are various methods for applying a flexible material such as plastic to the substrate and thinning the glass substrate to enable bending and deform and fix the liquid crystal display device into a curved shape. Proposed.

  Such a curved liquid crystal display device has a problem that light leakage occurs at the four corners of the display area in a black display state, and a plurality of methods for reducing this light leakage have been proposed.

  For example, Patent Document 1 describes a method in which protrusions are formed in at least one corner on the diagonal line side having a larger intersection angle with the liquid crystal initial alignment direction among the diagonal lines of the display region.

  Patent Document 2 describes a method of setting one of two substrates thin.

JP 2010-217234 A JP 2010-72505 A

  In the curved liquid crystal display device as described above, light leakage at the four corners of the display area in the black display state is reduced by the two means.

  However, since the protruding portion is provided in the method of Patent Document 1, the space (W1) between one side of the substrate and the display region is increased at that portion, and the ratio of the display region to the entire substrate is reduced, resulting in an increase in cost.

  In the method of Patent Document 2, it is necessary to make the thicknesses of the two substrates different. In order to prevent damage to the thinned substrate, the area of this substrate must be smaller than the area of the other substrate, and the ratio of the display area to the entire substrate is reduced, resulting in an increase in cost.

  Therefore, in the conventional countermeasures against light leakage in Patent Document 1 and Patent Document 2, there is a problem that the ratio of the display area in the entire substrate is reduced and the cost is increased.

  The present invention has been made in order to solve the above-described problems, and at a low cost without reducing the proportion of the display area in the entire substrate, and at the four corners when displaying black in the display area. The purpose is to reduce light leakage and eliminate display unevenness.

The liquid crystal display device according to the present invention is characterized in that the curvature of the four corners of the display area of the liquid crystal panel is made smaller than the curvature of other areas other than the four corners .

According to the present invention, since the curvature of the four corners of the liquid crystal panel is made smaller than the curvature of other regions other than the four corners, the stress concentration generated in the four corners is alleviated. Omission can be reduced and display unevenness is eliminated. In addition, since the ratio of the display area in the entire substrate is not reduced, the cost can be reduced.

It is an exploded view which shows the structure of the curved liquid crystal display device of Embodiment 1 of this invention. It is a top view of the liquid crystal panel used for this invention. It is sectional drawing of the liquid crystal panel used for this invention. It is a top view of the liquid crystal display device showing an example of the “four corner portions” and the “rectangular shape region along the non-curved side” of the present invention. It is a side view of the curved liquid crystal display device of Embodiment 1 of this invention. It is a perspective view of the spacer and curved liquid crystal panel of Embodiment 1 of this invention. It is an exploded view which shows the structure of the curved liquid crystal display device of Embodiment 2 of this invention. It is a side view of the curved liquid crystal display device of Embodiment 2 of this invention. It is an exploded view which shows the structure of the curved liquid crystal display device of Embodiment 3 of this invention. It is a side view which shows the structure of the curved liquid crystal display device of Embodiment 3 of this invention. It is an exploded view which shows the structure of the curved liquid crystal display device of Embodiment 4 of this invention. It is a side view of the curved liquid crystal display device of Embodiment 4 of this invention. It is a top view which shows the structure of the curved liquid crystal display device of Embodiment 5 of this invention. It is a perspective view of the spacer and curved liquid crystal panel of Embodiment 6 of this invention. It is an exploded view which shows the structure of the curved liquid crystal display device of Embodiment 6 of this invention. It is an exploded view which shows the structure of the curved liquid crystal display device of Embodiment 7 of this invention. It is an exploded view which shows the structure of the curved liquid crystal display device of Embodiment 8 of this invention. It is an exploded view which shows the structure of the curved liquid crystal display device of Embodiment 9 of this invention.

Embodiment 1 FIG.
First, the overall configuration of the liquid crystal display device of the present invention will be described with reference to the drawings. Also, the display pixel pattern and the film configuration are not shown. Unless otherwise specified, the overall configuration of the liquid crystal display device is common to all the embodiments. Moreover, what attached | subjected the same code | symbol is the same or it corresponds, This is common in the whole text of a specification.

  FIG. 1 is a diagram schematically showing a liquid crystal display device according to Embodiment 1 of the present invention. The disassembled state is shown so that the structure is easy to understand. In order to maintain the curved shape of the liquid crystal panel 1, as shown in FIG. 1, the liquid crystal panel 1 is sandwiched between a first curved protective plate 3a and a second curved protective plate 3b such as curved acrylic. Yes. In addition, a spacer 4 is attached to make the curvature of the corner smaller than other regions. As a light source, a backlight unit facing the array substrate 10 on the opposite side of the display surface of the liquid crystal panel 1 and a fixed spacer for keeping the distance between the two curved protective plates at both ends of the liquid crystal panel are provided. These components constitute the present liquid crystal display device by being housed in a housing in which a portion of the display surface of the liquid crystal display is visible.

  First, the liquid crystal panel 1 will be described. In this embodiment, as an example, a liquid crystal panel operated using a TFT (thin film transistor) as a switching element is used.

  FIG. 2 is a plan view of the liquid crystal panel 1. 3 is a cross-sectional view of the cut portion indicated by the one-dot chain line in FIG. 2 as viewed from the direction of the arrow II. The display area of the liquid crystal display device is the display area 7, and the outer width of the liquid crystal panel 1 from the display area 7 is the panel outer width W. The liquid crystal panel 1 includes an array substrate 10 (first substrate) on which switching elements are arranged, and a color filter substrate 20 (second substrate) that is bonded to the array substrate 10 by a sealing material 30. . Plastic is used for the material of these two substrates.

  Since the sealing material 30 is sandwiched between the array substrate 10 and the color filter substrate 20, the color filter substrate 20 is not shown in FIG. The sealing material 30 is indicated by a broken line.

  The sealing material 30 is a sealing material made of resin, and is formed in a pattern surrounding a region corresponding to the display surface of the liquid crystal display constituted by the array substrate 10 and the color filter substrate 20. A liquid crystal 40 is injected into a gap surrounded by the sealing material 30 and formed between the array substrate 10 and the color filter substrate 20. Although omitted, an injection port for injecting the liquid crystal 40 is formed as a pattern of the sealing material 30, and the injection port is further sealed with a sealant.

  Although not shown, the array substrate 10 is provided on the lower side of the alignment film that aligns the liquid crystal 40 in a region corresponding to the display surface on one surface of the glass substrate that is a transparent substrate, and drives the liquid crystal 40. A pixel electrode that applies a voltage to be applied, a common electrode that generates an electric field between the pixel electrode and driving the liquid crystal 40, a switching element such as a TFT that supplies a voltage to the pixel electrode, an insulating film that covers the switching element, and a switching element A gate wiring and a source wiring which are wirings for supplying signals are included. Further, outside the region corresponding to the display surface, a terminal 11 for receiving a signal supplied to the switching element from the outside is provided. The liquid crystal panel 1 includes a control board 2 equipped with a driving IC (integrated circuit) for sending a driving signal. The terminal 11 and the control board 2 are connected to each other via an FFC 21 (flexible flat cable). Electrically connected. A polarizing plate 50 is provided on the other surface of the glass substrate.

  On the other hand, although not shown, the color filter substrate 20 includes an alignment film that aligns the liquid crystal 40 on one surface of a glass substrate that is a transparent substrate, a color filter provided on the lower side of the alignment film, a light shielding layer, and the like. ing. A polarizing plate 50 is provided on the other surface of the glass substrate.

  The array substrate 10 and the color filter substrate 20 are bonded together via a gap material (not shown) that keeps the distance between the substrates at a constant distance. As the gap material, a granular gap material dispersed on the substrate may be used, or a columnar gap material formed by patterning a resin on any one of the substrates may be used.

  Next, the operation of the liquid crystal panel 1 will be described. When an electric signal is input from the control substrate 2, a driving voltage is applied to the pixel electrode and the common electrode, and the molecular direction of the liquid crystal 40 is changed in accordance with the driving voltage. Then, the light emitted from the backlight unit is transmitted or blocked to the viewer side through the array substrate 10, the liquid crystal 40 and the color filter substrate 20, whereby an image or the like is displayed on the display surface of the liquid crystal panel 1.

  A liquid crystal display device called an IPS (lateral electric field drive) system applies a lateral voltage between a pixel electrode and a counter electrode formed on one of a pair of substrates, and rotates liquid crystal molecules in a plane parallel to the substrate. This is a liquid crystal display device in a mode for displaying pixels, and has a characteristic that a chromaticity change is small at a wide viewing angle.

  The NB (normal black) type liquid crystal includes the IPS mode, and light leakage is particularly remarkable in the IPS mode as compared with other liquid crystal modes. The reason is that the liquid crystal is considered to rotate in the plane at the four-corner light missing portion, and the IPS mode liquid crystal is a mode in which the light transmittance is controlled by the in-plane rotation of the liquid crystal molecules.

  The above-described liquid crystal panel 1 is an IPS mode liquid crystal panel, but this is an example, and other configurations may be used. For example, the operation mode of the liquid crystal panel 1 may be a VA (vertical alignment) mode, a TN (twisted nematic) mode, an STN (super twisted nematic) mode, a ferroelectric liquid crystal mode, or the like. The driving method may be a simple matrix or an active matrix. Further, the description has been made using a normal transmissive liquid crystal panel, but a reflective type or a semi-transmissive type having both of them may be used.

  Next, a method for manufacturing the liquid crystal panel 1 will be described. The manufacturing method of the array substrate 10 and the color filter substrate 20 will be briefly described because a general method is used. The array substrate 10 is manufactured by forming switching elements, pixel electrodes, terminals, and transfer electrodes on one surface of a glass substrate by repeatedly using a pattern formation process such as film formation, patterning by photolithography, and etching. The Similarly, the color filter substrate 20 is manufactured by forming a color filter or a common electrode on one surface of a glass substrate.

  Next, a process until the array substrate 10 and the color filter substrate 20 are bonded together will be described. First, in the substrate cleaning process, the array substrate 10 on which the pixel electrodes are formed is cleaned. Next, in the alignment film material application step, an organic film made of polyimide, which is a material of the alignment film, is applied to one surface of the array substrate 10 by, for example, a printing method, and is baked and dried by a hot plate or the like. Thereafter, an alignment process is performed on the array substrate 10 coated with the alignment film material to form an alignment film. Also for the terminal 11, an alignment film is formed by washing, applying an organic film, and performing an alignment process. Subsequently, in a sealing material application process for forming the sealing material 30, a resin that serves as a sealing material is applied to one surface of the array substrate 10 or the terminal 11. For the sealing material 30, for example, a thermosetting resin such as an epoxy adhesive or an ultraviolet curable resin is used.

  The array substrate 10 and the color filter substrate 20 prepared as described above are arranged so as to face each other, and the pixels of the panel formed on each substrate are aligned and bonded so as to correspond to each other. . The sealing material 30 is cured on the array substrate 10 and the color filter substrate 20 bonded together as described above. This step is performed, for example, by applying heat according to the material of the seal or irradiating with ultraviolet rays.

  Subsequently, a thinning polishing process is performed to scrape the array substrate 10 and the color filter substrate 20 so as to enable bending. 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. In the first embodiment, the thicknesses of the array substrate 10 and the color filter substrate 20 are both 0.2 mm by chemical polishing using a chemical solution.

  Next, in the cell dividing step, the bonded substrates are divided into individual cells corresponding to the individual liquid crystal panels. After the cell dividing step, the liquid crystal 40 is injected from the liquid crystal injection port in vacuum in the liquid crystal injection step. Further, in the sealing step, for example, a liquid curable resin is applied to the liquid crystal inlet portion and irradiated with light to seal the liquid crystal inlet.

  Subsequently, in the polarizing plate 50 attaching step, the polarizing plate 50 is attached to the outside of the array substrate 10 and the color filter substrate 20. Furthermore, the control board 2 is mounted in the control board mounting process, and the liquid crystal panel 1 is completed.

  Next, the module part of the liquid crystal display device will be described. Since the liquid crystal panel 1 manufactured as described above is thinned in the polishing process, the liquid crystal panel 1 can be curved. Therefore, the liquid crystal panel 1 is bent by being sandwiched and fixed by two protective plates made of curved acrylic or the like from the front and rear.

  In the first embodiment, the display region 7 is a curved liquid crystal display device in which a liquid crystal panel having a long side direction of about 200 mm and a short side direction of about 120 mm is curved in a short side direction with a radius of curvature of 400 mm. However, this is only an example, and the panel may be of any size, the bending direction may be the long side direction, or may have any radius of curvature or a parabolic shape.

  Finally, a backlight or the like is assembled in the housing and a liquid crystal display device mounted with a curved liquid crystal panel is completed.

  In such a curved liquid crystal panel, since the liquid crystal panel originally having a flat substrate bonded thereto is bent into a curved shape, stress is concentrated particularly on the four corners, thereby changing the orientation of the liquid crystal 40 and changing the light. I found that it was missing.

  Therefore, as shown in FIG. 1, in the first embodiment, the spacer 4 is sandwiched between the concave surface of the first curved protective plate 3a and the liquid crystal panel 1 outside the display area 7 of the liquid crystal panel 1 and other than the four corners. It is out. Here, the “four corners” are, as an example, four points of about 20 mm from the corner of the panel display region 7 in the long side direction and about 35 mm in the short side direction. This is illustrated in the area 5 at the four corners of FIG. The spacer 4 is a thick adhesive sheet or the like, for example, so that the position can be fixed. As an example, the thickness of the spacer 4 is 1 mm. The spacer 4 may be made of any material that is transparent and allows light to pass through.

  A side view of the liquid crystal display device is shown in FIG. This side view is a right side view of the assembled liquid crystal display device of FIG.

  The liquid crystal panel 1 is bonded and fixed to the curved protective plate 3b, and the first curved protective plate 3a and the second curved protective plate 3b are supported by fixed spacers (not shown) at both ends. The portion where the spacer 4 is sandwiched is fixed by the first curved protective plate 3a and the second curved protective plate 3b via the spacer 4, while the four corner portions of the liquid crystal panel 1 without the spacer 4 are the first curved portion. It becomes a shape that floats from the protective plate 3a, and the force by which the acrylic plate presses the liquid crystal panel 1 is not applied to this portion. Therefore, the curvature of the four corners of the liquid crystal panel 1 becomes smaller than the other parts when the liquid crystal panel 1 that was originally a flat surface returns to the original state. The curved display maintains the curved shape by sandwiching and fixing the flat panel between the first curved protective plate 3a and the second curved protective plate 3b, and stress is generated. In the present invention, for the purpose of relaxing stress at the four corners, the curvature is relaxed only at the four corners of the panel curved as described above, and a gap is formed by floating from the curved shape of the first curved protective plate 3a. When the panel is shaped like this, the stress at the four corners of the panel can be relaxed. The smaller the curvature of the four corners, the higher the degree of light omission reduction. However, any curvature may be used as long as the curvature of the four corners is smaller than that of other regions.

  FIG. 6 is a perspective view showing the shape of the panel and the position of the spacer 4 at that time. Here, the curvature is the degree of bending of the panel surface as described above. Although this sample has a shape in which the short side is curved and the display surface side is convex, it may be curved so that the display surface side is concave. Here, the curvature is an amount representing the degree of bending of a curve or a curved surface. When the curvature is decreased, the curvature radius is increased, and when the curvature is increased, the curvature radius is decreased.

  With such a configuration, there is an effect of relieving stress generated at the four corners of the panel, so light leakage can be reduced. By this method, the contrast value of the region 6 shown in FIG. 4 is 100 in the sample in which the panel is simply sandwiched between the first curved protective plate 3a and the second curved protective plate 3b. In the sample of the present embodiment, it is improved to about 500. Further, when measures for preventing light leakage are taken, the distance of the panel outer width W in FIG. 2 is not increased, but can be reduced to about 1.5 mm. Therefore, the proportion of the display area 7 in the liquid crystal display panel 1 does not decrease. Furthermore, since the bending of the curved protective plate 3 is more easily broken, the present invention can reduce the stress at the four corners, thereby obtaining the effect of preventing damage at the four corners.

  Summarizing the above, it is possible to reduce the stress generated at the four corners concentrated by the bending by making the curvature of the four corners of the curved IPS liquid crystal panel smaller than the other parts. In the curved liquid crystal display device thus manufactured, light leakage at the four corners can be reduced, and display with reduced unevenness can be achieved. Further, since the ratio of the display area 7 occupying the entire substrate is not reduced, the cost can be reduced.

  It should be understood that the above-described embodiment is illustrative in all respects and not restrictive. The scope of the present invention is shown not by the scope of the embodiment described above but by the scope of claims, and includes all modifications within the meaning and scope equivalent to the scope of claims.

Embodiment 2. FIG.
In the first embodiment, the method of sandwiching the spacer 4 between the concave surface of the first curved protective plate 3a and the liquid crystal panel 1 as shown in FIG. 1 is used, so that the curvature of the four corners of the panel is made smaller than the other parts. Alternatively, the spacer 4 may be sandwiched between portions of the convex surface of the second curved protective plate 3b corresponding to the four corners of the panel. FIG. 7 shows an exploded state of the curved liquid crystal display device according to the second embodiment, and FIG. 8 shows a side view of the liquid crystal display device. This side view is a right side view of the assembled liquid crystal display device of FIG.

  In FIG. 8, the spacers 4 are provided at the four corners of the second curved protective plate 3b, so that the curvature of the liquid crystal panel at the four corners is set small.

  In FIG. 8, there is an air layer 9 between the first curved protective plate 3 a and the liquid crystal panel 1, and the height of the air layer 9 at the end portion of the central portion in FIG. Can be set to a small curvature at the four corners. In the second embodiment, the liquid crystal panel 1 needs to be bonded to the second curved protective plate 3b.

  According to this configuration, a desired panel shape can be obtained with a small spacer amount.

Embodiment 3 FIG.
In the first or second embodiment, the curvature of the four corners of the panel is made smaller than the curvature of the other portions by sandwiching the spacer 4 between the curved protective plate and the liquid crystal panel 1 as shown in FIG. 1 or FIG. Alternatively, a method may be used in which the corner groove 8 is set by gradually reducing the thickness of the concave portion of the first curved protective plate 3a corresponding to the four corners of the liquid crystal panel 1. FIG. 9 shows an exploded state of the curved liquid crystal display device according to the third embodiment, and FIG. 10 shows a side view of the liquid crystal display device. This side view is a right side view of the assembled liquid crystal display device of FIG.

  According to this configuration, a desired panel shape can be obtained simply by changing the shape of the first curved protective plate 3a, so that the curved liquid crystal display device can be easily manufactured.

Embodiment 4 FIG.
Alternatively, a method may be used in which the thicknesses of the portions corresponding to the four corners of the liquid crystal panel 1 on the convex surface of the second curved protective plate 3b are gradually increased. FIG. 11 shows an exploded state of the curved liquid crystal display device according to the third embodiment, and FIG. 12 shows a side view of the liquid crystal display device. This side view is a right side view of the assembled liquid crystal display device of FIG.

  In FIG. 12, the curvature of the liquid crystal panel at the four corners is set small because the four corner portions of the second curved protective plate 3b are thick.

  In FIG. 12, there is an air layer 9 between the first curved protective plate 3a and the liquid crystal panel 1, and the height of the air layer 9 at the end portion is narrower than the central portion in FIG. The curvature of the part can be set small. In the fourth embodiment, the liquid crystal panel 1 needs to be bonded to the second curved protective plate 3b.

  Even in this configuration, a desired panel shape can be obtained simply by changing the shape of the second curved protective plate 3b, and the production of the curved liquid crystal display device is simplified.

  Of the above-described embodiments, one of the first and third embodiments is selected as the first curved protective plate 3a, and one of the second and fourth embodiments is selected as the second curved protective plate 3b. One may be selected and the two may be combined.

Embodiment 5 FIG.
FIG. 13 is a diagram showing a second curved protective plate 3b of a liquid crystal display device according to Embodiment 5 of the present invention. FIG. 13 shows, as an example, a structure in which spacers 4 are inserted in the corners in order to make the curvature of the lower right and upper left corners smaller than other regions as in the second embodiment. Note that when the curvature of the lower right and upper left corners is made smaller than that of other regions, any of the structures of the first, third, and fourth embodiments may be used.

  In the fifth embodiment, the initial alignment direction 60 of liquid crystal molecules is set to be inclined by 10 degrees with respect to the short side direction 80. The initial alignment direction 60 of the liquid crystal molecules can be set by the rubbing direction of an alignment film (not shown) formed on the surfaces of the first and second substrates that are in contact with the liquid crystal. It has been found that the initial alignment direction of the molecules of the liquid crystal affects the intensity of light leakage generated at the corner portion of the display region 7 when the liquid crystal display device is bent.

  In black display in the IPS display mode, the liquid crystal is originally in the initial alignment state 60 and black display is performed by the orthogonal polarizing plate. However, when the alignment of the liquid crystal molecules changes in the in-plane direction due to the curvature. It is considered that the birefringence of the liquid crystal appears and light leakage occurs.

  As the above countermeasure, in the liquid crystal panel 1 of the fifth embodiment, the initial alignment direction 60 is set so as to be inclined from the short side direction 80 and the crossing angle with the initial alignment direction 60 of the liquid crystal among the diagonal lines of the display region 7 is larger. The curvature of only the two corners on the diagonal side corner is set to be smaller than the other parts.

  The stress is concentrated in the stress concentration region 70 due to the configuration in which the initial orientation direction is shifted. However, since the curvature of the corner of the stress concentration region 70 is reduced, the stress in the corner is relaxed and light leakage is reduced. In addition, by setting the initial alignment direction 60, stress is reduced at the two corners on the diagonal side of the diagonal of the display region 7 where the crossing angle with the initial alignment direction 60 of the liquid crystal is smaller, and light leakage is reduced. The

  By shifting the initial alignment direction and setting the curvature of the two corners on the diagonal to be smaller than those of the other parts, light leakage at the four corners can be reduced, and the ratio of the display area 7 to the entire substrate can be reduced. Since there is no effect, it is possible to obtain the same effect as in the first to fourth embodiments that the cost can be reduced.

  When such a configuration is used, light leakage can be reduced by processing only the two corner portions of the liquid crystal panel 1, and therefore, manufacture is easier than processing the four corner portions of the liquid crystal panel 1.

Embodiment 6 FIG.
FIG. 14 shows a liquid crystal panel shape of the liquid crystal display device according to the sixth embodiment. In the first to fifth embodiments, the method of making the curvature of the four corner portions or the two corner portions of the panel smaller than the other portions is taken, but as in the sixth embodiment, along the non-curved side including the four corner portions. A method of making the curvature of the two rectangular regions smaller than the other portions may be used. When these two regions are illustrated, it becomes the region 90 in FIG. The region 90 includes at most the four corners as shown in the figure, but may be a narrower range including the vicinity of the long side (non-curved side). In the sixth embodiment, for example, the spacer 4 is sandwiched outside the display area 7 and outside the area 90 between the concave surface of the first curved protective plate 3a and the liquid crystal panel 1. By adopting such a shape, the stress concentrated at the four corners can be reduced, and compared with the case where the curvature of only the corner of the panel is reduced, the stress along the non-curved side is flat and the stress at the four corners is reduced. Concentration can be further reduced. FIG. 15 shows an exploded state of the curved liquid crystal display device according to the sixth embodiment.

Embodiment 7 FIG.
Moreover, the method of pinching the spacer 4 in the part which hits the area | region 90 of the 2nd curved protection board 3b convex surface may be sufficient. FIG. 16 shows an exploded state of the curved liquid crystal display device according to the seventh embodiment. The side view of this liquid crystal display device is equivalent to FIG. This side view is a right side view of the assembled liquid crystal display device of FIG.

Embodiment 8 FIG.
Further, instead of using a spacer as in the sixth and seventh embodiments, the thickness of the concave portion of the first curved protective plate 3a corresponding to the region 90 of the liquid crystal panel 1 is gradually reduced to set a non-curved side peripheral groove. The method may be used. FIG. 17 shows an exploded state of the curved liquid crystal display device according to the eighth embodiment. The side view of this liquid crystal display device is equivalent to FIG. This side view is a right side view of the assembled liquid crystal display device of FIG.

  In this configuration, a desired panel shape can be obtained simply by changing the shape of the first curved protective plate 3a, and the production of the curved liquid crystal display device is simplified. In addition, the creation of the protective plate shape is easier than in the case of only the four corner portions of the third and fourth embodiments.

Embodiment 9 FIG.
Further, a method of gradually increasing the thickness of the portion corresponding to the region 90 of the liquid crystal panel 1 on the convex surface of the second curved protective plate 3b may be used. FIG. 18 shows an exploded state of the curved liquid crystal display device according to the ninth embodiment. The side view of this liquid crystal display device is equivalent to FIG. This side view is a right side view of the assembled liquid crystal display device of FIG.

DESCRIPTION OF SYMBOLS 1 Liquid crystal panel 2 Control board 3a 1st curve protection board 3b 2nd curve protection board 4 Spacer 5 Four corner area 6 Contrast detection area 7 Display area 8 Corner groove 9 Air layer 10 Array board 11 Terminal 20 Color filter board 21 FFC
30 Sealing material 40 Liquid crystal 50 Polarizing plate 60 Initial orientation direction 70 Stress concentration region 80 Short side direction 90 Rectangular shape region along non-curved side W Panel external width

Claims (8)

A rectangular first substrate; a rectangular second substrate disposed opposite to the first substrate; and a liquid crystal panel having liquid crystal filled between the first substrate and the second substrate,
The liquid crystal panel is curved, and the curvature of the four corner portions is smaller than the curvature of other regions other than the four corner portions . A rectangular first substrate; a rectangular second substrate disposed opposite to the first substrate; and a liquid crystal panel having liquid crystal filled between the first substrate and the second substrate,
  The liquid crystal panel is curved, the initial alignment direction of the molecules of the liquid crystal is tilted from the short side direction of the liquid crystal panel,
  Of the diagonal lines defined in the display area of the liquid crystal panel, the curvature of the corners of the liquid crystal panel located on the diagonal line having the larger crossing angle with the initial alignment direction is other than the corners. A liquid crystal display device characterized by being smaller than a curvature. The liquid crystal panel is sandwiched between the concave surface of the first curved protective plate and the convex surface of the second curved protective plate that hold the curved shape,
  Between the concave surface of the first curved protective plate and the convex surface of the liquid crystal panel opposed thereto, a spacer located outside the display area of the liquid crystal panel and on the outer peripheral portion of the liquid crystal panel excluding the four corners is sandwiched. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a liquid crystal display device. The liquid crystal panel is sandwiched between the concave surface of the first curved protective plate and the convex surface of the second curved protective plate that hold the curved shape,
  3. The spacer according to claim 1, wherein a spacer is sandwiched between a convex surface of the second curved protective plate and a concave surface of the liquid crystal panel facing the second curved protective plate. Liquid crystal display device. The liquid crystal panel is sandwiched between the concave surface of the first curved protective plate and the convex surface of the second curved protective plate that hold the curved shape,
  The concave surface side of the first curved protective plate has a thickness of a region facing a corner portion of the liquid crystal panel that is thinner than that of other portions. Liquid crystal display device. The liquid crystal panel is sandwiched between the concave surface of the first curved protective plate and the convex surface of the second curved protective plate that hold the curved shape,
  The convex surface side of the second curved protective plate has a thickness of a region facing a corner of the liquid crystal panel that is thicker than other portions. Liquid crystal display device. The liquid crystal display device according to claim 1, wherein the first substrate and the second substrate are plastic substrates. The liquid crystal display device according to claim 1, wherein the liquid crystal panel performs display by a horizontal electric field driving method.

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