JP2010197865A - Lighting curtain, backlight device, and liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backlight device in which luminance unevenness can be suppressed, wherein the device can be easily assembled, and the load of assembly work is reduced. <P>SOLUTION: The backlight device has: CCFL 34 arranged at a predetermined interval; a case 31 with a bottom, which has one open face and inside of which the CCFL 34 is arranged; a lighting curtain 36 which is arranged at the open face of the case 31 with the bottom and intercepts a portion of light emitted from the CCFL 34; and a diffusion plate 32 which diffuses and transmits light passed through the lighting curtain 36. The lighting curtain 36 has two or more light-shielding parts for intercepting a portion of incident light and a transmission part for transmitting incident light and further has a corrugated plate shape where two or more top parts 36a are formed at a predetermined interval. The light-shielding part has a light-shielding pattern formed of a light-shielding member, the light-shielding patterns are located at respective top parts 36a and are the same at two or more top parts. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lighting curtain, a backlight device using the lighting curtain, and a liquid crystal display device including the backlight device.

  Conventionally, as means for reducing luminance unevenness of a backlight device, for example, as shown in Patent Document 1, gradation of light-shielding dots is made in accordance with the distance from the lamp (the shape of the light-shielding dots is changed stepwise). ) Means using a lighting curtain are widely known.

  However, the conventional lighting curtain is formed in a thin sheet shape, and is fixed to the bottomed case or the reflection plate using a pin or a columnar support member. There is a configuration in which the lighting curtain is simply placed on the diffusion plate without using pins or the like.

  In such an installation form, the lighting curtain is bent, and the distance (position) of the lighting curtain with respect to the lamp becomes inaccurate, and the luminance in the backlight device becomes uneven.

  As means for suppressing the bending of the lighting curtain, for example, as shown in Patent Document 2, a device using a fluorescent tube fixing plate or the like is known.

  Furthermore, for example, Patent Document 3 and Patent Document 4 can be listed as technical documents related to the conventional lighting curtain.

Japanese Patent Laid-Open No. 6-301034 JP 2005-1117023 A Japanese Patent Laid-Open No. 5-119313 JP-A-6-273760

  According to Patent Document 2, when assembling a backlight device, it is difficult to align the lighting curtain, and it is difficult to accurately install the lighting curtain.

  As shown in Patent Document 1, in a backlight device using a thin sheet-like lighting curtain, it is difficult to completely suppress sheet bending and the like, and the visibility of the liquid crystal display device is hindered (brightness) Variation occurs). Further, as shown in Patent Document 2, if the visibility of the liquid crystal display device is to be improved, there is a problem that the workability in the assembly work of the backlight device is deteriorated.

  The present invention has been made in view of the above-described problems, and can be used for a backlight device that can suppress unevenness in brightness and that facilitates assembly work and reduces the load of assembly work. It is an object to provide a lighting curtain and a liquid crystal display device using the backlight device.

  The first invention includes a plurality of light shielding portions that are formed at predetermined intervals and shields part of incident light, and a plurality of transmission portions that transmit incident light, and the plurality of light shielding portions includes a plurality of light shielding portions. A lighting curtain that is disposed on a top and has a plurality of tops and is formed into a corrugated plate shape.

  A second invention is the lighting curtain according to the first invention, wherein the plurality of light shielding portions have a light shielding pattern formed of a light shielding member, and the light shielding patterns are the same at the plurality of top portions. .

  According to a third aspect of the present invention, light sources arranged at predetermined intervals, one surface is an open surface, a housing in which the light source is disposed, an open surface of the housing, and emitted from the light source The lighting curtain according to the first invention or the second invention that blocks a part of the light, and a diffusion plate that diffuses and transmits the light transmitted through the lighting curtain, and each top portion of the lighting curtain includes a light source The backlight device is arranged at a position opposite to the backlight device.

  A fourth invention is a liquid crystal display device comprising the backlight device according to the third invention and a liquid crystal panel disposed at a position where light is transmitted through the diffusion plate.

  According to the present invention, it is possible to suppress unevenness in luminance, and it is easy to assemble and reduce the load of the assembling work.

It is sectional drawing which shows schematic structure of the liquid crystal display device 1 which concerns on embodiment of this invention. It is a figure which shows the outline of the manufacturing method of the lighting curtain 36 used for the backlight apparatus 3 of the liquid crystal display device 1. FIG. FIG. 3 is a diagram showing a schematic configuration of a lighting curtain 36. It is a figure which shows the modification of the lighting curtain 36, and is a figure corresponding to FIG. It is a figure which shows the modification of the lighting curtain 36, and is a figure corresponding to FIG. It is a figure which shows each modification of the lighting curtain 36, and is a figure corresponding to FIG.3 (b). It is a figure which shows the modification of the lighting curtain 36, and is a figure corresponding to FIG.3 (b). It is a figure which shows the modification of the lighting curtain.

  FIG. 1 is a cross-sectional view showing a schematic configuration of a liquid crystal display device 1 according to an embodiment of the present invention, and FIG. 2 is an outline of a manufacturing method of a lighting curtain 36 used in the backlight device 3 of the liquid crystal display device 1. FIG. 2A is a perspective view showing a flat lighting curtain 36 before being bent, and FIG. 2B is a view showing molding of the lighting curtain 36 using a mold M. FIG. FIG. 3 is a diagram showing a schematic configuration of the lighting curtain 36 used in the backlight device 3 of the liquid crystal display device 1. 3A is a perspective view of the lighting curtain 36, and FIG. 3B is a view as seen from the direction of the arrow B in FIG. 3A.

  In the liquid crystal display device 1, the upper side in FIG. 1 is the viewing side (display surface side; front side), a liquid crystal panel 2 as a display unit installed on the upper side, and a direct backlight that illuminates the liquid crystal panel 2. The apparatus 3 is provided. Note that the lower side of FIG. 1 is the rear side of the liquid crystal display device 1.

  The backlight device 3 includes an open bottomed case (housing) 31, and a diffusion plate 32 is installed so as to cover the opening (one open surface) of the bottomed case 31. Inside the bottomed case 31, a reflective sheet (reflective member) 33 called a reflector, a cold cathode fluorescent lamp (CCFL) 34 serving as a light source, a lamp holder 35, and a lighting curtain (sheet) 36 are disposed ( Stored). The liquid crystal panel 2 is disposed at a position where the light of the CCFL 34 is transmitted through the diffusion plate 32 of the backlight device 3.

  The backlight device 3 includes an optical sheet (for example, an optical sheet for improving a viewing angle such as a polarization separation film, a diffusion film, and a prism sheet) 51. The optical sheet 51 includes the liquid crystal panel 2 and the backlight device. 3 diffusing plates 32.

  In the liquid crystal display device 1 shown in FIG. 1, the lighting curtain 36 and the diffusion plate 32 are spaced by a distance L1, and the diffusion plate 32 and the optical sheet 51 are spaced by a distance L2. 51 and the liquid crystal panel 2 are spaced by an interval L3. Actually, however, the liquid crystal panel 2, the optical sheet 51, and the diffusion plate 32 are rectangular openings of the bottomed case 31 by a rectangular annular chassis. It is installed integrally on the edge of the part. At this time, the value of the interval L1 is approximately “0” or very small, the value of the interval L2 is approximately “0”, and the value of the interval L1 is “0”. The above values are negligible.

  The reflection member (reflector) 33 is disposed mainly on the rear side of the CCFL 34, and reflects light emitted from the CCFL 34 toward the front side (upper side in FIG. 1) of the liquid crystal display device 1. The diffusion plate 32 is formed in a flat plate shape, and is disposed in parallel to the CCFL 34 on the front side of the CCFL 34 at a predetermined distance from the CCFL 34.

  Here, a case where a plurality of line light sources such as CCFLs 34 arranged in parallel with each other at a predetermined interval (arranged on the same plane) is used as the light source will be described.

  As a specific example, the diffusion plate 32 is made of a rectangular synthetic resin having a thickness of about 2 mm, and the CCFL 34 has a cylindrical shape with a tube diameter of about 3 mm, and has a rectangular bottomed case (reflecting member). 33) A plurality of wires are arranged in the longitudinal direction of 31 at a predetermined interval (23 mm). When the 42-inch size liquid crystal display device 1 is assumed, the number is 22. The distance between the lower surface of the diffusing plate 32 and the bottom 53 of the inner surface of the reflecting member 33 is 9 mm.

  The lighting curtain 36 is used to reduce the lamp image of the CCFL 34 that is a line light source. That is, the lighting curtain 36 is provided with a dot shape, and is used so that the luminance at the diffusion plate 32 by light emitted from the CCFL 34 is substantially uniform. The light transmitted through the lighting curtain 36 is diffused by the diffusion plate 32 and transmitted through the diffusion plate 32.

  The lighting curtain 36 is installed so as to cover each CCFL 34 by being three-dimensionally formed. The cross-sectional shape of the lighting curtain 36 in the plane orthogonal to the extending direction of the CCFL 34 is the same shape. That is, in the shape shown in FIG. 1, it extends in the direction orthogonal to the paper surface of FIG.

  The lighting curtain 36 is three-dimensionally bent by being formed in a corrugated plate shape, for example, and is disposed between the diffusion plate 32 and the CCFL 34. Further, as described above, the lighting curtain 36 is provided with a dot shape for dimming the light emitted by the CCFL 34 (see FIGS. 2A and 3A). In other words, the lighting curtain 36 is disposed on the open surface (open surface side) of the bottomed case 31 and partially shields the light emitted from the CCFL 34.

  The bottomed case 31 is formed in, for example, a metal rectangular bowl shape. The reflecting member 33 is formed in a rectangular bowl shape with, for example, resin. A reflection portion is formed on the inner surface of the reflection member 33. The reflecting member 33 is provided on the bottomed case 31 such that the outer surface thereof is in contact with the inner surface of the bottomed case 31 or opposed with a slight gap. The rectangular opening side of the bottomed case 31 and the reflecting member 33 is the front side of the backlight device 3 (the liquid crystal display device 1), and the bottomed case 53 and the reflecting member 33 are flat and have a rectangular bottom 53. This is the rear side of the backlight device 3.

  Each CCFL 34 is provided integrally with the bottomed case 31 and the reflection member 33 near the bottom 53 of the inner surface of the reflection member 33 via the lamp holder 35. The longitudinal direction of the CCFL 34 coincides with the longitudinal direction (or the width direction) of the reflecting member 33 and the bottomed case 31. In addition, the CCFLs 34 are provided in parallel with each other at a predetermined pitch p1 and the distances between the CCFLs 34 and the planar bottom 53 of the inner surface of the reflecting member 33 are equal. Yes.

  Here, the lighting curtain 36 will be described in more detail.

  As described above, the lighting curtain 36 is formed in, for example, a corrugated plate shape so as to be bent three-dimensionally.

  Note that the corrugated plate has only a sinusoidal shape as shown in FIG. 6D (corresponding to FIG. 3B) in a cross-sectional shape perpendicular to the flow direction (extending direction of the CCFL 34). Instead, it includes a shape in which a certain shape such as a rectangular wave shape is repeated.

  For example, as shown in FIGS. 1 and 3 (b), the cross-sectional shape includes a shape in which an isosceles trapezoid is repeated (a shape in which a rising portion and a falling portion of a rectangular wave are slanted). Shall be.

  That is, the lighting curtain 36 shown in FIGS. 1 and 3B includes a rectangular flat bottom portion 36b, a rectangular flat top portion 36a, and a flat oblique rising portion (an oblique portion) 36e. And bends at an obtuse angle at the boundaries of the portions 36a, 36b, 36e to form a corrugated plate.

  As shown in FIG. 1, the bottom 36 b is in surface contact with the bottom 53 of the reflecting member 33, and the lighting curtain 36 is provided integrally with the reflecting member 33. In this case, the longitudinal direction of the CCFL 34 and the flow direction of the lighting curtain 36 (the flow direction of water in the case where the lighting curtain 36 is assumed to be a corrugated iron plate) are orthogonal to the paper surface of FIG. 1 or FIG. Are in the same direction.

  Further, as shown in FIG. 1, the CCFL 34 is located in an isosceles trapezoidal space SP surrounded by an oblique portion 36e, a top portion 36a, and a bottom portion 53 of the reflecting member 33, and is a bent lighting curtain. 36 covers the CCFL 34. In addition, the pitch (wave pitch) of the lighting curtain 36 and the pitch p1 of the CCFL 34 coincide with each other. In the width direction of the lighting curtain 36 (the horizontal direction in FIGS. 1 and 3B), the CCFL 34 is , Located in the center of the space SP. A plurality of spaces SP are formed, and the CCFL 34 is installed in each space SP.

  As shown in FIG. 3A, the dot shape 55 provided in the lighting curtain 36 is similar to the dot shape described in, for example, Japanese Patent Application Laid-Open No. 2005-117023. By being provided, even though the light source is a linear light source such as CCFL 34, the light source is dimmed so that uniform luminance can be obtained by the diffusion plate 32. In addition, you may make it perform the said light control using a thing other than a dot shape.

  The lighting curtain is formed by printing the dot shape 55 on a film having a thickness of 0.2 mm based on a PET (Poly Ethylene Terephthalate) material. The dots are formed by printing a white ink (light shielding member) having a high light reflectance on the film in a predetermined pattern, and there are a large number of dots or a dot diameter in a region close to the position facing the CCFL 34. As the distance from the CCFL 34 increases, the number of dots gradually decreases, or the dot diameter gradually decreases. The light transmittance of the CCFL 34 through the light sheet is optimally adjusted.

  For example, when the lighting curtain 36 is installed on the reflecting member 33, the dot diameter in a portion (front portion; top) 36a located between the CCFL 34 and the diffusion plate 32 and parallel to the diffusion plate 32 is The light transmittance in the front part 36a of the lighting curtain 36 is reduced.

  On the other hand, when the lighting curtain 36 is installed on the reflecting member 33, the dot diameter in a portion (oblique portion) 36e that is located between the CCFL 34 and the diffusion plate 32 and is inclined with respect to the diffusion plate 32 is: It is smaller than the dot diameter in the front part 36a.

  More specifically, the dot in the front portion 36a of the lighting curtain 36 has a larger diameter as it is closer to the CCFL 34, and the diameter is smaller as the distance from the CCFL 34 increases. That is, in FIG. 1, the diameter of the dot provided at the position directly above the CCFL 34 is the largest, and the diameter of the dot is reduced as it moves in the horizontal direction from directly above the CCFL 34.

  Further, the dot in the oblique portion 36e of the lighting curtain 36 has a larger dot diameter as it is closer to the front portion 36a of the lighting curtain 36, and the dot diameter decreases as the distance from the front portion 36a of the lighting curtain 36 increases. ing.

  Each dot has a different diameter, but the pitch at which the dots are provided is constant. Further, in the flow direction of the lighting curtain 36 (the direction orthogonal to the paper surface in FIGS. 1 and 3B), dots having the same diameter are arranged at the pitch. That is, the print pattern of the light shielding member is constant in the flow direction of the lighting curtain 36 and changes appropriately in the width direction of the lighting curtain 36.

  As described above, the lighting curtain 36 includes a plurality of light-shielding portions that are formed at predetermined intervals and shields a part of incident light, and a plurality of transmission portions that transmit incident light. A light shielding portion is disposed on a plurality of top portions (top portions) 36a, and is formed in a corrugated plate shape including the plurality of top portions 36a.

  The plurality of light shielding portions have a light shielding pattern formed from a light shielding member, and the light shielding patterns are the same at the plurality of top portions 36a. Further, each top portion 36 a of the lighting curtain 36 is disposed at a position facing the CCFL 34.

  Further, as described above, the number of dots may be increased or decreased instead of or in addition to changing the dot diameter. For example, all the dots may have the same diameter, the dot pitch in the front portion 36a of the lighting curtain 36 may be reduced, and the dot pitch in the oblique portion 36e of the lighting curtain 36 may be increased.

  It should be noted that when the lighting curtain 36 is installed on the reflecting member 33, no dots are formed on the portion (bottom portion) 36 b of the lighting curtain that is in contact with the reflecting member 33.

  Here, a method for manufacturing the lighting curtain 36 will be described.

  First, a dot shape is formed on a flat (sheet-like) film (material) with a thickness of 0.2 mm based on a PET material by screen printing, etc. using white ink with high light reflectance, which is an example of a light shielding member. (See FIG. 2A).

  Subsequently, the film is placed in a desired three-dimensional structure forming mold M, and press molding is performed by a hot press, a vacuum press, or the like (see FIG. 2B). At this time, if pressing is performed while applying a temperature of about 100 ° C., cracks during processing can be suppressed.

  In the above description, an example in which the lighting curtain is formed after the shading dot printing is shown, but the shading dot printing may be performed after pressing.

  Here, each dimension of the lighting curtain 36 having a three-dimensional structure (three-dimensionally formed) will be exemplified with reference to FIG. The width L4 of the upper part 36a located immediately above the CCFL 34 is 8 mm, the width L5 of the bottom part 36b between the CCFLs 34, that is, the bottom part 36b contacting the reflector 33, is 4.2 mm, and the inclination angle (an oblique part) 36e connecting the bottom part 36b and the upper part 36a. 36c is 60 °, and the wave height 36d of the lighting curtain 36 is 8.5 mm.

  In addition, it is desirable that a positioning reference hole or the like for fixing to the reflector 33 is provided in the bottom portion 36 b of the lighting curtain 36. It is assumed that the reference hole or the like is adapted to engage with a protrusion provided in the reflector 33.

  Further, as the corrugated lighting curtain 36, various forms other than those shown in FIGS. 1, 3B, and 6D can be considered.

  First, as shown in FIG. 4, the shape of the cross section (the shape of the cross section by a plane perpendicular to the flow direction) is arranged with a semicircular shape at a predetermined interval, and the semicircles are connected by a straight line. It can be of shape. The semicircles are arranged in the same posture so that the end portions are positioned on one straight line, and the straight line portion between the semicircles is the bottom of the lighting curtain 36 (reflecting member). A portion in contact with (36).

  In addition, as shown in FIG. 5, the cross-sectional shape of the inverted “V” shape is arranged at a predetermined interval, and each inverted “V” shape is connected by a straight line. be able to. In addition, each said reverse "V" -shaped thing is located in a line with each end located on one straight line in the same posture, and a straight line between each reverse "V" -shaped thing. The portion becomes the bottom portion 36 b of the lighting curtain 36.

  Further, the cross-sectional shape may be formed in a rectangular wave shape as shown in FIG.

  In addition, as shown in FIG. 6 (b), the cross-sectional shapes are formed by arranging inverted “U” -shaped items at predetermined intervals, and connecting the inverted “U” -shaped items with straight lines. Can be. The inverted “U” -shaped ones are arranged in the same posture so that the ends are positioned on one straight line, and the straight lines between the inverted “U” -shaped ones are arranged. The portion becomes the bottom portion 36 b of the lighting curtain 36.

  Further, as shown in FIG. 6C, the cross-sectional shape may be a shape obtained by chamfering a corner portion of a rectangular wave shape (corner portion on the diffusion plate 32 side).

  According to the backlight device 3, the lighting curtain 36 is three-dimensionally bent so as to cover the CCFL 34, and the cross-sectional shape of the lighting curtain 36 by a plane orthogonal to the extending direction of the CCFL 34 is the same shape. Therefore, the light emitted from the CCFL 34 is moderately dimmed by the lighting curtain 36 in which the dot pattern is formed and bent three-dimensionally, thereby suppressing the occurrence of uneven brightness in the backlight device 3 (diffuser plate 32). Can do.

  Further, the lighting curtain 36 has increased rigidity, and the lighting curtain 36 can be easily installed on the backlight device 3 (the reflecting member 33 and the bottomed case 31) with high positional accuracy. That is, the assembly work of the backlight device 3 is facilitated, and the work load of the assembly work is reduced.

  For example, the lighting curtain 36 having a three-dimensional structure is more rigid than a flat one, so when connected to the reflector (reflector) 33 (when installed on the bottomed case 31 or the reflector 33), there are several places. It is only necessary to fix (about 10 places), and it is not necessary to consider the visibility as a material used for fixing to the reflecting member 33. For example, it is possible to fix using a one-touch clip or an adhesive. The lighting curtain 36 can be easily installed on the reflecting member 33 and the like.

  Further, according to the backlight device 3, the light shielding member (dot shape 55) is printed on the sheet-like material before the lighting curtain 36 is three-dimensionally formed. It can be done easily.

  By the way, as shown in FIG. 7, the lighting curtain 36g is formed in a flat plate shape, and a support member 57 configured and installed in the same manner as the corrugated lighting curtain 36 described with reference to FIG. A flat lighting curtain 36g may be installed. In this case, it is assumed that the lighting curtain 36g is integrally supported by the support member 57 with a binder having both the function of the optical coupling agent and the function of the adhesive.

  Here, the support member 57 is preferably a member used for a lighting curtain or a transparent member having excellent visibility. For example, a material having all processability, visibility and rigidity, such as transparent PET and PET material imparted with diffusion performance, is desirable.

Furthermore, the lighting curtain may be bent in a form other than corrugated.

  For example, as shown in FIG. 8 (FIG. 8B is a cross-sectional view taken along line BB in FIG. 8A), a point light source such as an LED 59 may be employed as the light source of the backlight device. In this case, the plurality of LEDs 59 are arranged on the substantially same plane with a predetermined interval. When a point light source is adopted instead of a line light source, each part of the lighting curtain 36h corresponding to each LED 59 is formed in a bowl shape (for example, a truncated cone shape). That is, the concave and convex portions formed in a bowl shape (the concave and convex portions that are concave so as to wrap around the LEDs 59 when viewed from the LEDs 59 and are convex on the diffusion plate 32 side) 61 are the pitches at which the LEDs 59 are installed. It is formed with the same pitch.

  In the above-described backlight device 3, the lighting curtain used for reducing the lamp image of the light source increases the rigidity of the lighting curtain (when installed in the reflecting member 33 or the bottomed case 31 or when installed). This is an example of a backlight device that is bent three-dimensionally (in order to increase the rigidity to improve the positional accuracy relative to the light source or the like).

  Further, since the relative positional accuracy with respect to the light source and the like is improved, it is easy to reduce the lamp image of the light source on the diffusion plate 32.

  By the way, the lighting curtain formed in a flat plate shape has high rigidity with respect to the rotational moment around the axis extending in the thickness direction, and low rigidity with respect to other external forces.

  Therefore, when a lighting curtain formed in a flat plate shape is used, the lighting curtain is easily distorted in the thickness direction, and the accuracy of the installation position of the lighting curtain with respect to the light source or the like deteriorates due to the distortion.

  On the other hand, as shown in FIGS. 1 and 3, etc., the lighting curtain 36 is bent into a corrugated plate or the like, thereby lighting against the moment about the axis extending in the left-right direction in FIGS. 1 and 3B. The rigidity of the curtain 36 is increased, and the relative positional accuracy with respect to the CCFL 34 etc. (installation accuracy on the bottomed case 31 etc.) can be improved compared to the case where it is formed in a flat plate shape, Uniformity of luminance in the diffusion plate 32 is ensured.

  As already understood, the lighting curtain 36 is three-dimensionally bent in order to increase the rigidity. However, the three-dimensional bending allows the rigidity against external forces in all directions to be flat. It is not higher than the ones. That is, as described above, the lighting curtain 36 has a rigidity for improving the relative positional accuracy with the CCFL 34 or the like when it is or is installed on the reflecting member 33 or the bottomed case 31. Has been increased.

  In addition, the lighting curtain shown in the above figures (each surface in the thickness direction of the flesh of the lighting curtain) is composed of a plane that can be developed in a plane, but it may be a quadric surface such as a spherical surface. Good. That is, in FIG. 8, the concavo-convex portion may be formed in a hemispherical shell shape, or in FIG. 3 (b), FIG. 4 (b), FIG. 5 (b), and FIG. For example, the lighting curtain may be bent along the cylindrical side surface having a large radius of curvature.

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Liquid crystal panel 3 Backlight apparatus 31 Bottomed case 32 Diffusion plate 33 Reflector (reflection member)
34 CCFL
35 Lamp holder 36, 36g, 36h Lighting curtain 36a Top of lighting curtain 36b Bottom of lighting curtain 36c Inclination angle 36d Height 55 Dot shape

Claims (4)

A plurality of light shielding portions that are formed at predetermined intervals and shield a part of incident light;
A plurality of transmission parts that transmit incident light; and
The lighting curtain is characterized in that the plurality of light-shielding portions are arranged on a plurality of top portions, and are formed in a corrugated plate shape including the plurality of top portions. The plurality of light shielding portions have a light shielding pattern formed from a light shielding member,
The lighting curtain according to claim 1, wherein the light shielding pattern is the same at the plurality of top portions. Light sources arranged at predetermined intervals;
One surface is an open surface, and a housing in which the light source is disposed,
The lighting curtain according to claim 1 or 2, wherein the lighting curtain is disposed on the open surface of the housing and blocks a part of light emitted from the light source.
A diffusion plate that diffuses and transmits light transmitted through the lighting curtain;
And each top portion of the lighting curtain is disposed at a position facing the light source. A backlight device according to claim 3;
A liquid crystal panel disposed at a position where the light passes through the diffusion plate;
A liquid crystal display device comprising:

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