JP2008153161A - Lighting device for display device, display device - Google Patents

Abstract

Provided is a lighting device for a display device, in which light from a light source is uniformly dispersed and emitted as illumination light, so that a problem that a lamp image is visually recognized based on bright / dark visual recognition hardly occurs.
An illumination device for a display device according to the present invention includes a plurality of tubular light sources 17 arranged in parallel, and a light diffusing plate 15 disposed on a light emission side of the tubular light source 17, and the tubular light source. Reference numeral 17 denotes a polygonal column shape, and the tube side surfaces 17 b and 17 c are inclined with respect to the plate surface 15 a of the light diffusion plate 15.
[Selection] Figure 4

Description

  The present invention relates to a lighting device for a display device and a display device using the same.

In a display device using a non-light-emitting optical element typified by a liquid crystal display device, a backlight device is provided on the back of the display panel to irradiate light to the display panel such as a liquid crystal panel. (For example, refer to Patent Document 1).
JP 2003-228065 A

  Patent Document 1 discloses a technique for improving the uniformity of light irradiated on a liquid crystal panel and improving the light utilization efficiency. Specifically, a technique is disclosed in which a light turning member is provided below the fluorescent tube along the longitudinal direction of the fluorescent tube so that light with good uniformity can be incident on the diffusion plate.

  However, even if such a technique disclosed in Patent Document 1 is used, there is a case in which the lamp image is easily visually recognized because the fluorescent tube is cylindrical. In other words, the light emitted from the cylindrical fluorescent tube is difficult to be uniformly emitted to the light emitting surface side, and particularly when the distance between the adjacent fluorescent tubes is large, the light and darkness is clearly recognized and becomes a lamp image. The display quality may be lowered.

  The present invention has been made on the basis of such a background, and the lamp image can be visually recognized based on light / dark visual recognition by uniformly dispersing the light from the light source and emitting it as illumination light. An object of the present invention is to provide an illumination device for a display device that is less likely to cause defects. It is another object of the present invention to provide a display device that can realize high-quality display using such a display device illumination device.

  In order to solve the above-described problems, an illumination device for a display device according to the present invention includes a plurality of tubular light sources arranged in parallel and a light diffusion plate disposed on a light emission side of the tubular light source, and the tubular device The light source is formed in a polygonal column shape, and the tube side surface is inclined with respect to the plate surface of the light diffusion plate.

  According to such an illumination device for a display device, since the tube side surface of the polygonal column-shaped tubular light source is inclined with respect to the plate surface of the light diffusion plate, the light diffusion plate covers a wide range. The light is uniformly incident, and the light and darkness along the arrangement of the tubular light sources is difficult to be visually recognized. Therefore, it is difficult to cause a problem of visually recognizing the image (lamp image) of the tubular light source, and it is possible to provide a high-quality illumination device for a display device that can emit uniform light.

  The tubular light source may have a narrow interval portion where the arrangement interval of the tubular light sources is relatively narrow and a relatively wide interval portion. By providing the narrow interval portion and the wide interval portion in this way, it becomes possible to vary the illumination luminance according to the arrangement position of the tubular light sources. That is, it is possible to provide illumination light with high brightness in the narrow space portion and illumination light with relatively low brightness in the wide space portion.

The narrow interval portion may be formed on the side of the arrangement center of the tubular light source, and the wide interval portion may be formed on the arrangement end side of the tubular light source.
In this way, if the arrangement interval of the tubular light sources is reduced on the arrangement center portion side, the luminance can be improved on the arrangement center portion side. In particular, in a display device, there are many cases where it is desired to brighten the central portion, so that the tubular light sources are concentrated in the central portion and the tubular light sources are scattered in the end portion, so that light can be efficiently emitted to the necessary portions while reducing costs. Irradiation is possible. In such a configuration in which the arrangement interval is varied for each position, light and darkness is generally easily recognized on the arrangement end side where the arrangement interval is relatively wide, and an image of the tubular light source (lamp image). ) May be highly visible. However, in the present invention, since the side surface of the tube is inclined with respect to the plate surface of the light diffusion plate, it becomes possible to make light uniformly incident on the light diffusion plate over a wide range. Therefore, it is difficult for a trouble to occur.

In the illumination device for a display device according to the present invention, the tubular light source is configured in a triangular prism shape, and a side surface of the triangular prism is inclined with respect to a plate surface of the light diffusion plate.
In this case, the side surface of the triangular prism constitutes the inclined surface of the tube side surface, and the side surface of the triangular prism is inclined with respect to the plate surface of the light diffusion plate. Light uniformly enters the diffuser plate over a wide range, and it becomes difficult to visually recognize the light and darkness along the arrangement of the tubular light sources. Therefore, it becomes difficult to cause a problem that an image (lamp image) of the tubular light source is visually recognized. As a result, it is possible to provide a high-quality illumination device for a display device that can irradiate uniform light. Become.

In the above configuration, the first apex of the triangular prism is oriented toward the plate surface side of the light diffusing plate, while two side surfaces constituting the first apex are inclined with respect to the plate surface of the light diffusing plate. It can be.
In this case, since the two side surfaces (second side surface and third side surface) constituting the first top portion are oriented toward the light diffusion plate side and are inclined with respect to the plate surface of the light diffusion plate, the tubular shape The light emitted from the light source is uniformly incident on the light diffusing plate over a wide range, and the light and darkness along the arrangement of the tubular light sources is difficult to be visually recognized. Therefore, it becomes difficult to cause a problem that an image (lamp image) of the tubular light source is visually recognized. As a result, it is possible to provide a high-quality illumination device for a display device that can irradiate uniform light. Become.

On the other hand, the said tubular light source is comprised by the square pillar shape of an axial cross-section rhombus, The rhombus side surface shall incline with respect to the plate | board surface of the said light diffusing plate.
In this case, the side surface of the tube is constituted by a rhomboid side surface, and the side surface is inclined with respect to the plate surface of the light diffusion plate. Light is uniformly incident over a wide range, and the light and darkness along the arrangement of the tubular light sources becomes difficult to be visually recognized. Therefore, it becomes difficult to cause a problem that an image (lamp image) of the tubular light source is visually recognized. As a result, it is possible to provide a high-quality illumination device for a display device that can irradiate uniform light. Become.

The said structure WHEREIN: The 1st top part of the said square cross-section square pillar is orient | assigned to the plate | board surface side of the said light diffusing plate, and the two side surfaces (1st side surface and 2nd side surface) which form the said 1st top part are the said light. It can be inclined with respect to the plate surface of the diffusion plate.
Thus, by directing the first top of the rhomboid quadrangular prism toward the plate surface side of the light diffusing plate, the first side surface and the second side surface forming the first top portion are directed to the plate surface of the light diffusing plate. It is possible to tilt the light source suitably, and the light emitted from the tubular light source can be uniformly incident on the light diffusion plate over a wide range, so that it is difficult to visually recognize the light and darkness along the arrangement of the tubular light sources. Become. Therefore, it becomes difficult to cause a problem that an image (lamp image) of the tubular light source is visually recognized. As a result, it is possible to provide a high-quality illumination device for a display device that can irradiate uniform light. Become.

Further, in the above configuration, a light reflecting plate is formed on the side opposite to the light emitting side of the tubular light source, the second top portion facing the first top portion is directed to the plate surface side of the light reflecting plate, and the second Two side surfaces (third side surface and fourth side surface) forming the top portion may be inclined with respect to the plate surface of the light reflecting plate.
In this case, the light emitted from the side surface of the rhombus is either on the light emitting surface side or the light reflecting surface side, and in particular, the second top portion is directed to the plate surface side of the light reflecting plate to form the second top portion. Since the two third side surfaces and the fourth side surface are inclined with respect to the plate surface of the light reflecting plate, light can be uniformly incident on the light reflecting plate over a wide range. Then, the reflected light is uniformly incident on the light diffusion plate side over a wide range, and as a result, the light and darkness along the arrangement of the tubular light sources is hardly visually recognized. Therefore, it is difficult to cause a problem of visually recognizing the image (lamp image) of the tubular light source, and it is possible to provide a high-quality illumination device for a display device that can emit uniform light.

The light reflecting plate is formed with a mountain-shaped reflecting portion located between the adjacent tubular light sources, and the mountain-shaped reflecting portion has two side surfaces (a third side surface and a first side surface) forming the second top portion. 4 side surfaces) may be provided.
In this case, light emitted from the third side surface and the fourth side surface of the tubular light source can be suitably reflected by the reflection-side inclined surface of the mountain-shaped reflection portion. And the light utilization efficiency will improve by making the reflected light radiate | emit from a light-projection surface, and using with illumination light. In particular, by forming the mountain-shaped reflecting portion between adjacent tubular light sources, each inclined surface of the mountain shape can be directed to each of the adjacent tubular light sources, and the configuration is also efficient.

The said structure WHEREIN: The said reflection side inclined surface and the two side surfaces (3rd side surface and 4th side surface) which form the said 2nd top part shall be comprised non-parallel.
In this case, it is possible to eliminate the problem of reflecting the light emitted from the third side surface and the fourth side surface to the side surface. If the light emitted from each side surface is reflected on the side surface, the light cannot be used as illumination light. Therefore, by making the reflecting side inclined surface and each side surface non-parallel, it becomes possible to direct the reflected light in a direction different from each side surface (specifically, the direction of the light exit surface), improving the light utilization efficiency. It becomes possible to contribute to.

The tubular light source is held by a clip-like light source holding member attached to a case member including the light reflecting plate, and the light source holding member has a tube side surface of the tubular light source on the light diffusion plate. The tubular light source can be held only in a state inclined with respect to the plate surface.
In this case, by holding the tubular light source on the light source holding member, the tube side surface of the tubular light source can be inclined with respect to the plate surface of the light diffusion plate. Specifically, the tubular light source may be held only when the tube side surface is inclined with respect to the plate surface of the light diffusion plate. For example, an inclined surface that is inclined with respect to the plate surface of the light diffusing plate is formed in the holding portion of the light source holding member, and the holding force is applied only when the inclined surface and the tube side surface overlap, and when they do not overlap No holding force is applied to the tube, and the tubular light source comes out of the holding portion.

  Next, in order to solve the above-described problem, a display device of the present invention includes the display device illumination device described above and a display panel that performs display using light from the display device illumination device. It is characterized by that.

  According to such a display device, since the illumination device for a display device that supplies light to the display panel is according to the present invention, a high-quality display in which there is little luminance unevenness and the lamp image is difficult to visually recognize is realized. It becomes possible.

  As the display panel, a liquid crystal panel can be exemplified. Such a display device can be applied as a liquid crystal display device to various uses, for example, a desktop screen of a television or a personal computer, and is particularly suitable for a large screen.

  According to the present invention, there is provided a lighting device for a display device in which light from a light source is uniformly dispersed and emitted as illumination light so that a problem that a lamp image is visually recognized based on light / dark visual recognition hardly occurs. It becomes possible. In addition, it is possible to provide a display device capable of realizing high-quality display using such a display device illumination device.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings.
1 is an exploded perspective view showing a schematic configuration of a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a sectional view showing the schematic configuration of the liquid crystal display device, and FIG. 3 is a cold cathode tube (tubular light source) and a lamp clip. FIG. 4 is an explanatory view showing the operational effects achieved by the backlight device of the liquid crystal display device of the present embodiment. FIG. 5 is a cross-sectional view showing a modification of the liquid crystal display device, and FIG. 6 is an explanatory diagram showing the operational effects achieved by the backlight device of FIG.

  First, the overall configuration of the liquid crystal display device (display device) 10 will be described. As shown in FIGS. 1 and 2, the liquid crystal display device 10 includes a rectangular liquid crystal panel 11 and a backlight device 12 as an external light source, and these are integrally held by a bezel 13 or the like. It has become. Among these, the liquid crystal panel 11 is configured such that a pair of glass substrates are bonded together with a predetermined gap therebetween, and liquid crystal is sealed between the glass substrates. One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, and the other glass substrate is opposed to An electrode and a color filter composed of each color such as R, G, and B are provided.

Next, the backlight device 12 will be described. The backlight device 12 is a so-called direct-type backlight device, and a light source (here, a cold cathode tube 17) is provided directly below the back surface of the panel surface (display surface) of the liquid crystal panel 11 along the panel surface. It has a configuration arranged in parallel.
The backlight device 12 includes a substantially box-shaped metal base (case member) 14 having an upper surface opened, and a plurality of optical members 15 attached so as to cover the opening of the base 14 (diffusing sequentially from the lower side in the figure). A plate, a diffusion sheet, a lens sheet, an optical sheet), a frame 16 for holding these optical members 15 on the base 14, a cold cathode tube (tubular light source) 17 that is a lamp accommodated in the base 14, and a cold A lamp holder 19 that collectively covers the cathode tube 17 group and a lamp clip 20 for holding a portion of the cold cathode tube 17 excluding both ends are provided. In the backlight device 12, the optical member 15 side is the light emitting side from the cold cathode tube 17.

  The substantially box-shaped base 14 is made of a metal sheet metal, and a reflection surface 14a is formed on the inner surface side (light source side) of the base 14 by a light reflection sheet. By the base (light reflecting plate) 14 including such a reflecting surface 14a, the light emitted from the cold cathode tube 17 can be reflected toward the optical member 15 such as a diffusing plate (hereinafter also referred to as the diffusing plate 15). It is possible. In addition, the reflective surface 14a can also be provided in the state which does not form a reflective sheet by comprising base 14 itself from what carried out the sheet metal processing of the light-reflective metal plate-shaped object.

  The cold-cathode tubes 17 have an elongated tube shape in one direction, and a large number (18 in FIG. 1) are parallel to each other in a state in which the length direction (axial direction) coincides with the long side direction of the base 14. Are accommodated in the base 14 in a state of being arranged in parallel (a state of being arranged in parallel). Particularly, the cold cathode fluorescent lamps 17 are arranged so that the parallel direction of the cold cathode fluorescent lamps 17 is parallel to the light reflecting surface 14a of the base 14, and the plate surface (light emitting surface) of the optical component 15 including the diffusion plate and the like. The parallel direction is parallel to 15a. The light reflecting surface 14a of the base 14 and the plate surface 15a of the optical component 15 are installed in parallel. Further, the arrangement intervals of the cold cathode tubes 17 are narrower than the arrangement end side on the arrangement central portion side, that is, on the back side of the panel central portion of the liquid crystal panel 11, the cold cathode tubes 17 are arranged. The arrangement interval is narrow, and the arrangement interval of the cold cathode tubes 17 is wide on the upper and lower end sides of the liquid crystal panel 11.

  Further, each cold cathode tube 17 has a so-called triangular prism shape with a triangular cross section, and two tube side surfaces 17b and 17c constituting the triangular column are arranged with respect to a plate surface 15a such as a diffusion plate 15 as shown in FIG. It is disposed in the base 14 in an inclined manner. Specifically, the first top portion 17a of the triangular cold cathode tube 17 is directed to the plate surface 15a side of the diffusion plate 15 and the like, while the side surface 17d facing the first top portion 17a is directed to the reflecting surface 14a side of the base 14. Thus, the remaining two side surfaces (that is, the side surfaces forming the first top portion 17a) 17b and 17c are disposed so as to be inclined with respect to the plate surface 15a of the diffusion plate 15 or the like.

  On the other hand, the lamp clip 20 functions as a clip-shaped light source holding member, is made of synthetic resin (for example, made of polycarbonate), and includes a mounting plate 21 addressed to the bottom wall surface of the base 14 as shown in FIG. The mounting plate 21 is provided with a locking portion 22, a lamp holding portion 23, and the like. A plurality of lamp clips 20 are attached to the base 14 so that each cold cathode tube 17 can be held at two or three different locations in the length direction.

  Each lamp clip 20 is configured to hold the cold cathode tube 17 only when the tube side surfaces (inclined surfaces) 17b and 17c of the cold cathode tube 17 are inclined with respect to the plate surface 15a such as the diffusion plate 15. Yes. Specifically, an inclined surface 23a that is inclined with respect to the plate surface 15a of the diffusion plate 15 or the like is formed in the lamp holding portion 23 of the lamp clip 20, and the inclined surface 23a and the tube side surfaces 17b and 17c overlap each other. Only in this case, it is assumed that a holding force is applied to the cold-cathode tube 17, and if it does not overlap, no holding force is applied and the cold-cathode tube 17 comes out of the lamp holding portion 23. Here, the lamp holding portion 23 is formed of an elastic member, and the holding force as described above is applied by elastic return based on the complete insertion of the cold cathode tube 17, while the inclined surface 23a and the tube are not inserted completely. When the side surfaces 17b and 17c do not overlap each other, the cold cathode tube 17 comes out of the lamp holding portion 23 due to its elastic force. With such a configuration, the tube side surfaces 17b and 17c of the cold cathode tube 17 can be easily attached to the plate surface 15a such as the diffusion plate 15 only by holding the cold cathode tube 17 on the lamp holding portion 23 of the lamp clip 20. It is possible to incline.

  Further, the mounting plate 21 of the lamp clip 20 is formed in an elongated rectangular shape along the short side direction of the base 14 (direction perpendicular to the length direction of the cold cathode tube 17). On the lower surface of the mounting plate 21 (the surface facing the base 14 and the surface to be attached to the base 14), as shown in FIG. Projecting toward the base 14 side).

  On the other hand, the locking portion 22 includes a base portion 25 that is suspended from the lower surface of the mounting plate 21 and a pair of elastic locking pieces 26 that extend obliquely upward from the tip portion of the base portion 25. Both elastic locking pieces 26 are formed in a cantilever shape connected to both side surfaces of the distal end portion of the base portion 25, and can be elastically deformed along the direction of contacting and separating from the base portion 25 using the connection portion as a fulcrum. . The locking portion 22 can be inserted into each mounting hole 14a provided at a corresponding position in the base 14, and a step portion formed at the distal end portion of the elastic locking piece 26 is a mounting hole. It can be locked to the peripheral edge on the back side of 14 a, and this is a locking surface 26 a for the base 14.

  On the upper surface of the mounting plate 21 (the surface facing the cold cathode tube 17 and the surface on the opening side of the base 14), a lamp holder is provided for holding the middle portion of the cold cathode tube 17 excluding both ends in the length direction. The part 23 is provided protruding upward. The lamp holding part 23 can surround the entire peripheral surface of the cold cathode tube 17 as a whole, and is formed in an end ring shape that opens upward to allow the cold cathode tube 17 to be attached and detached. Further, on the lower surface of the mounting plate 21, abutting portions 35, 36 that can come into contact with the upper surface of the base 14 at the time of mounting are provided protruding downward.

The liquid crystal display device of the present embodiment has the above configuration, and the operation and effect will be described subsequently.
First, in the liquid crystal display device 10 of the present embodiment, a plurality of triangular prismatic cold cathode tubes 17 are arranged in parallel in the backlight device 12, and a diffusion plate 15 and the like are arranged on the light emission side of the cold cathode tubes 17. In addition, the tube side surfaces 17b and 17c of the triangular cathode-shaped cold cathode tube 17 are arranged to be inclined with respect to the plate surface 15a such as the diffusion plate 15 (see FIG. 4). Accordingly, light is uniformly incident on the diffusion plate 15 over a wide range, and the brightness and darkness along the array of the cold cathode tubes 17 is difficult to be visually recognized. As a result, it becomes difficult to cause a problem that an image (lamp image) of the cold cathode tube 17 is visually recognized, and it is possible to irradiate the liquid crystal panel 11 with uniform light.

  In particular, the first top portion 17a of the triangular prism is oriented toward the plate surface 15a side of the diffusion plate 15, while the two side surfaces 17b and 17c constituting the first top portion 17a are inclined with respect to the plate surface 15a of the diffusion plate 15. It is said that. Accordingly, the two side surfaces (second side surface 17b and third side surface 17c) constituting the first top portion 17a are oriented toward the diffusion plate 15 side and are inclined with respect to the plate surface 15a of the diffusion plate 15. The light emitted from the cold cathode tube 17 is uniformly incident on the diffuser plate 15 over a wide range, and the brightness and darkness along the array of the cold cathode tubes 17 is difficult to be visually recognized. As a result, it becomes difficult to cause a problem that an image (lamp image) of the cold cathode tube 17 is visually recognized, and it is possible to irradiate the liquid crystal panel 11 with uniform light.

  Further, in the liquid crystal display device 10 of the present embodiment, the arrangement interval of the cold cathode tubes 17 is narrower at the arrangement center portion side than at the arrangement end portion side. Accordingly, it is possible to improve the luminance at the cold cathode tube 17 arrangement center side, while reducing the number of cold cathode tubes 17 by widening the arrangement interval at the end side, thereby realizing cost reduction. Yes. Furthermore, normally, brightness and darkness are easily visually recognized on the side of the array end where the array interval is relatively wide, and the possibility that the image (lamp image) of the cold cathode tube 17 is visually recognized can be increased. However, in this embodiment, since the tube side surface of the cold cathode tube 17 is inclined with respect to the plate surface 15a of the diffusion plate 15 or the like, light is uniformly incident on the diffusion plate 15 or the like over a wide range. This makes it possible to prevent such a problem from occurring.

  Although the embodiment according to the present invention has been described above, the present invention is not limited to the embodiment described with reference to the above description and drawings. For example, the following embodiment is also included in the technical scope of the present invention. In addition to the following, various modifications can be made without departing from the scope of the invention.

FIG. 5 is a schematic cross-sectional view showing a modified example of the backlight device included in the liquid crystal display device, and FIG. 6 is an explanatory view showing the effects thereof. 5 and 6, the same components as the various components of the backlight device 12 illustrated in FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof is omitted.
In the backlight device 12A of FIG. 5, a cold cathode tube 70 as a tubular light source is configured in a rectangular column shape with an axial section rhombus, and the rhomboid side surfaces 75 and 76 are inclined with respect to the plate surface 15a such as the diffusion plate 15. ing. Specifically, the first top portion 71 of the rectangular column having a rhombic axial section is directed to the light reflecting surface 14a side, while the second top portion 72 facing the first top portion 71 is directed to the diffusion plate 15 side or the like. . The two side surfaces 73 and 74 forming the first top portion 71 are inclined with respect to the light reflecting surface 14a of the base 14, while the two side surfaces 75 and 76 forming the second top portion 72 are the diffusion plates. It is configured to be inclined with respect to the plate surface 15a such as 15.

  In the backlight device 12A, a mountain-shaped reflecting portion 44 is formed on the base 14 constituting the light reflecting plate. This mountain-shaped reflection portion 44 is located between adjacent cold cathode tubes 17 and is configured to include inclined surfaces (reflection-side inclined surfaces) 45 and 46 facing the tube side surfaces 73 and 74. In particular, the inclined surfaces 45 and 46 are configured to be non-parallel to the tube side surfaces 17b and 17c.

  According to such a backlight device 12A, the light emitted from the rhomboid side surfaces 73, 74, 75, 76 is on either the plate surface (light emitting surface) 15a side or the light reflecting surface 14a side of the diffusion plate 15. The The surfaces 73, 74, 75, and 76 constituting the tube side surface are inclined with respect to both the light emitting surface 15a and the light reflecting surface 14a, and therefore light incident directly on the plate surface 15a from the tube side surface. In addition, the light reflected from the light reflecting surface 14a and incident on the plate surface 15a side is uniformly incident on the diffuser plate 15 and the like over a wide range. The light and darkness along the line is difficult to see. Therefore, it is difficult to cause a problem that an image (lamp image) of the cold cathode tube 17 is visually recognized. As a result, it is possible to irradiate the liquid crystal panel 11 with uniform light.

  Further, in the backlight device 12 </ b> A, since the mountain-shaped reflecting portion 44 is provided, the light emitted from the tube side surfaces 73 and 74 of the cold cathode tube 70 is applied to the inclined surfaces 45 and 46 of the mountain-shaped reflecting portion 44. Therefore, it is possible to suitably reflect. In particular, since the tube side surfaces 73 and 74 and the inclined surfaces 45 and 46 are non-parallel, it is difficult to cause a problem that the light emitted from the tube side surfaces 73 and 74 is reflected on the tube side surfaces 73 and 74. It is supposed to be. If the light emitted from the tube side surfaces 73 and 74 is reflected on the tube side surfaces 73 and 74, the light cannot be used as illumination light. Therefore, by making the tube side surfaces 73, 74 and the inclined surfaces 45, 46 non-parallel, the reflected light can be directed in a direction different from the tube side surfaces 73, 74 (specifically, the light exit surface 15a direction). It is possible to contribute to the improvement of light utilization efficiency.

  In addition to the above-described modifications, the above-described embodiment shows the case where the cold cathode tubes 17 and 70 are used as the tubular light source. However, for example, the present invention also includes a tube using other types of tubular light sources such as a hot cathode tube. include. Further, the lamp clip 20 is configured to collectively hold a plurality of light sources, but may be a clip that holds individual light sources separately.

  In addition, the present invention can also be applied to a liquid crystal display device using a switching element other than a TFT, and can be applied to a liquid crystal display device that performs monochrome display in addition to a liquid crystal display device that performs color display. Furthermore, although the liquid crystal display device has been described in the above-described embodiment, the present invention is applicable to other display devices that use a backlight device other than the liquid crystal.

1 is an exploded perspective view showing a schematic configuration of a liquid crystal display device according to an embodiment of the present invention. Sectional drawing of the liquid crystal display device of FIG. The front view which shows schematic structure of a lamp clip. Explanatory drawing which shows the effect of a backlight apparatus. The front view which shows the modification of the backlight apparatus of a liquid crystal display device. FIG. 6 is an explanatory diagram showing the configuration and operational effects of the backlight device of FIG. 5.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Backlight device (illuminating device for display devices), 14 ... Base (light reflecting plate), 15 ... Optical component (Diffusion plate etc.) Light diffusion plate), 15a ... Plate surface (light emitting surface), 17 ... Cold cathode tube (tubular light source), 17b, 17c ... Tube side surface (inclined surface)

Claims (12)

A plurality of tubular light sources arranged in parallel, and a light diffusing plate disposed on the light emitting side of the tubular light source,
The tubular light source is configured in a polygonal column shape, and the side surface of the tube is inclined with respect to the plate surface of the light diffusion plate.   2. The illumination device for a display device according to claim 1, wherein the tubular light source includes a narrow space portion in which arrangement intervals of the tubular light sources are relatively narrow and a relatively wide space portion. .   The illumination for a display device according to claim 2, wherein the narrow space portion is formed on an array center side of the tubular light source, and the wide space portion is formed on an array end side of the tubular light source. apparatus.   4. The display device according to claim 1, wherein the tubular light source is configured in a triangular prism shape, and a side surface of the triangular prism is inclined with respect to a plate surface of the light diffusion plate. Lighting equipment.   The first top portion of the triangular prism is directed to the plate surface side of the light diffusion plate, and two side surfaces constituting the first top portion are inclined with respect to the plate surface of the light diffusion plate. The illumination device for a display device according to claim 4.   4. The tubular light source according to any one of claims 1 to 3, wherein the tubular light source is formed in a rectangular column shape having a rhombic axial section, and a rhomboid side surface is inclined with respect to a plate surface of the light diffusion plate. The illumination device for display apparatuses as described.   The first apex of the rectangular column having the rhombic axial section is directed to the plate surface side of the light diffusing plate, and the two side surfaces forming the first apex are inclined with respect to the plate surface of the light diffusing plate. The illumination device for a display device according to claim 6. A light reflection plate is formed on the side opposite to the light emission side of the tubular light source,
The second top portion facing the first top portion is directed to the plate surface side of the light reflecting plate, and two side surfaces forming the second top portion are inclined with respect to the plate surface of the light reflecting plate. The illumination device for a display device according to claim 7,   The light reflecting plate is formed with a mountain-shaped reflecting portion positioned between the adjacent tubular light sources, and the mountain-shaped reflecting portion is inclined on the reflection side facing the two side surfaces forming the second top portion. The illumination device for display device according to claim 8, further comprising a surface.   The lighting device for a display device according to claim 9, wherein the reflection-side inclined surface and the two side surfaces forming the second top portion are configured to be non-parallel. A lighting device for a display device according to any one of claims 1 to 10,
And a display panel that performs display using light from the illumination device for display device.   The display device according to claim 11, wherein the display panel is a liquid crystal panel using liquid crystal.

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