JP4002901B2 - Backlight device - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical light source holding member for a backlight device used in a liquid crystal display device (hereinafter referred to as an LCD). Regarding improvements.

  Conventionally, backlight devices and LCDs have been widely used as display devices for electronic devices such as microcomputers and television receivers. Since the LCD is non-luminous, it requires a light source for external illumination such as a backlight device.

  Such a conventional LCD is roughly divided into a liquid crystal cell and a backlight device. The liquid crystal cell is a color filter, a liquid crystal sealed between two glass substrates on which a TFT (thin film transistor) array is formed, It is comprised with the polarizing plate arrange | positioned at each outer surface of the glass substrate.

  In addition, as a backlight device used in an LCD, it is common to use a thin fluorescent tube (fluorescent lamp) such as a cold cathode tube or a hot cathode tube as a cylindrical light source. An edge light system in which a cylindrical light source is disposed, a reflector (hereinafter referred to as a reflector) and a cylindrical light source are housed in the casing, and the cylindrical light source is disposed in the light transmission diffusion plate disposed in the opening of the casing. There is known a direct system in which direct light from a light source and light from a cylindrical light source reflected by a reflection plate are incident and diffused by a light transmission diffusion plate to emit uniform planar light.

  The direct method or edge light method described above is selected according to the required performance of the LCD, but the direct method uses the direct light of the cylindrical light source, so the light use efficiency is higher than the edge light method and a large monitor This is suitable for applications requiring high brightness such as for televisions and television receivers.

  As a light source support member for correcting bending in a direction orthogonal to the axial direction of a thin cylindrical light source having a small diameter and long length (hereinafter referred to as a lamp) used in a conventional direct backlight device or LCD. An O-ring formed of silicon rubber or the like is inserted into the glass outer wall of the lamp, and the outer periphery of the O-ring is brought into contact with a reflecting plate formed on the inner surface of a substantially box-shaped casing serving as a lamp house. However, when the housing becomes larger and becomes a 30-inch to 45-inch LCD, the lamp becomes longer, and it becomes impossible to correct the deflection in the direction of the adjacent lamp by using only the O-ring, and uneven brightness on the illumination surface of the LCD. Was produced.

  Japanese Patent Application Laid-Open No. H10-228688 discloses a lamp holder that can eliminate such a harmful effect. 9 (A) to (C) show a part of the configuration of the lamp holder described in Patent Document 1, and FIG. 9 (A) is a schematic side sectional view of a direct-type backlight device. DESCRIPTION OF SYMBOLS 1 is a lamp | ramp which comprises a cylindrical light source, 2 is a lamp holder which supports a lamp | ramp, 3 is a box-shaped housing | casing which has the reflecting plate 4 in the inside used as the lamp house which made the upper part an opening part, , 6 is a liquid crystal panel (LCD).

  As shown in FIGS. 9B and 9C, the lamp holder 2 has a plurality of inverted Ω-shaped sandwiching portions 9 for sandwiching the tube wall of the lamp 3 on a substantially rectangular base 8. The insertion portion 10 formed in the lower part of the base 8 is inserted and fixed in the through hole 11 formed in the reflection plate 4, and the lamp 1 is supported by the lamp holder 2 to prevent the lamp 1 from slackening.

  Further, the direct-type backlight usually has a light diffusing plate 5 arranged with a space of several tens of millimeters from the lamp 1 in the screen direction.

  Acrylic or the like is used for the material of the light diffusing plate 5 and is very sensitive to thermal expansion. When there is a temperature difference between the front and back of the light diffusing plate 5, the temperature is warped in the higher direction. When used in a direct type backlight, it is warped in the direction of the lamp 1 and causes uneven brightness.

  Therefore, as shown in FIG. 9A, the projection 7 formed at the intermediate portion of the lamp holder 2 can maintain the distance from the diffusion plate 5 and suppress the luminance unevenness.

  That is, an LCD having both functions of preventing the lamp 1 from being bent by the lamp holder 2 and preventing the light diffusion plate 5 from warping is disclosed.

  Further, Patent Document 2 discloses that even if the illumination surface of a large-sized LCD or backlight device as a lamp holder 2 or 2a for preventing the lamp 1 from bending is changed from a horizontal state to a downward state through a vertical direction. Disclosed are lamp holders 2 and 2a configured so that the elongated lamp 1 does not bend.

  FIG. 10 (A) shows a perspective view in which a part of the backlight device disclosed in Patent Document 2 showing a support state of the lamp is cut away, and corresponds to FIGS. 9 (A) to 9 (C). Are denoted by the same reference numerals, and redundant description is omitted. The lamp holder 2 that holds the lamp 1 in FIG. 10A is configured as shown in FIGS. 10B to 10D.

  FIG. 10B is a perspective view showing the structure of an example of the lamp holder. As shown in the figure, the lamp holder 2 has a plate shape and is rectangular when viewed from the bottom surface side, and has a concave periphery on the flat surface side. The concave peripheral side has a peripheral surface 12a and protrusions that extend from both sides of the peripheral surface 12a and extend from the base 13 on the rectangular side. By fixing the base 13 to the bottom surface of the housing 3 with the peripheral surface 12a facing up, the peripheral surface 12a is a curved surface including a portion whose contact surface is substantially parallel to the bottom surface of the case. The upper surfaces (supporting surfaces of the light diffusing plate) 12b, 12c of each protrusion are substantially parallel to the bottom surface of the housing 3 in a state where the lamp holder 2 is fixed to the housing (reflecting plate 4). The height of the upper surface 12b from the bottom surface of the housing 3 is higher than that of the other upper surface 12c, and is in contact with the light diffusion plate 5 to support the light diffusion plate 5.

  In the backlight device including the lamp holder 2 having such a configuration, the lamp 1 is supported by the peripheral surface 12a even when the backlight device is directed horizontally upward, vertically, or obliquely, so that it bends. There is no. In addition, since the light diffusion plate 5 is supported by the upper surface 12b, it is possible to prevent the light diffusion plate 5 from being bent.

  FIGS. 10C and 10D show another lamp holder 2a. The shape of the lamp holder 2a is a substantially rectangular plate shape, and has a substantially spiral inner peripheral surface 14 that extends substantially toward the center. The lamp holder 2a has protrusions extending from the base 13 on both sides of the inner peripheral surface 14, and the base 13 is a casing with the upper surfaces (supporting surfaces of the light diffusion plates) 12b and 12c of the respective protrusions facing upward. By fixing to the bottom surface of (reflecting plate 4) 3, the inner peripheral surface 14 includes a curved surface of approximately 360 °. The upper surfaces 12b and 12c of the protrusions are substantially parallel to the bottom surface of the housing 3 with the lamp holder 2a fixed to the housing 3, and the height of one upper surface 12b from the bottom surface of the housing 3 is the other. It is higher than the upper surface 12c and abuts against and supports the light diffusion plate 5.

  FIG. 10D is an explanatory view for explaining the insertion position of the lamp 1 to be inserted into the lamp holder 2, and the lamp 1 inserted in the direction of arrow A from the cut start side is supported by the inner peripheral surface 14. Even when the backlight device is directed horizontally upward, vertically, diagonally, or horizontally downward, the lamp 1 is supported by the inner peripheral surface 14, so that the lamp 1 is not bent and the light diffusion plate 5 is formed by the upper surface 12b. Since the light diffusion plate 5 can be prevented from being bent, the backlight device can support the lamp 1 in all directions, and the bending can be prevented so that the viewer can lower the display surface of the LCD like a planetarium. As in the case of looking up from above, the lamp 1 can be supported even when the LCD faces downward.

  In the lamp holder 2 having the configuration shown in Patent Document 1 described above, when a plurality of lamps 1 arranged in parallel in the housing 3 are bent toward the reflecting plate 4 side of the housing 3, a leaf spring-like sandwiching portion 9 is used. The tube wall of the lamp 1 can be pressed by the above, but when the lamp 1 bends in the direction of the adjacent lamp 1 installed flat, one sandwiching piece of the flexible sandwiching portion 9 bends, The deflection of the lamp 1 in the direction cannot be maintained. Therefore, there is a problem that the pitch between adjacent lamps 1 provided in a flat manner changes and causes uneven brightness on the illumination surface of the LCD or the backlight device.

  Further, in the lamp holder 2 configured as shown in FIG. 10B of Patent Document 2, when the lamp 1 bends upward, the same problem as described in Patent Document 1 occurs. In the lamp holder 2 having the configuration shown in the figure, the position where the lamp insertion port of the lamp holder 2 holds the tube wall of the lamp 1 is different in the upper, lower, left, and right directions. Then, the case where the bending of the lamp 1 further increases occurs. For example, when the lamp 1 bent in the direction of the arrow B in FIG. 10D is inserted, the lamp 1 is supported by the inner peripheral surface 14 and is further bent in the direction of the arrow B. Therefore, in order to support the lamp 1 with the inner peripheral surface 14 regardless of whether the backlight device is oriented horizontally upward, vertically, diagonally or horizontally downward, it is necessary that the lamp 1 is not bent due to other factors. The bent lamp 1 has a problem that causes luminance unevenness on the illumination surface of the LCD or the backlight device.

Furthermore, according to the lamp holders 2 and 2a described in Patent Document 1 and Patent Document 2 described above, the following problems occur.
(1) The above-mentioned lamp holders 2 and 2a are fixed on the reflector 4 of the housing 3, and the tube wall of the detachable lamp 1 is inserted into the sandwiching portion 9, the peripheral surface 12a, and the inner peripheral surface 14. In recent large-sized LCDs, the stem constituting the electrode of the lamp 1 is made of rubber or the like fitted in the through holes formed in the left and right side plates of the housing 3 or the reflector 4. Since the electrode wire inserted through the ring and drawn out from the electrode is soldered and fixed to a printed circuit board or the like, the lamp holders 2 and 2a are provided on the bottom surface of the housing 3 or the reflection in order to lay the plurality of lamps 1 flat. It is necessary to place it fixed on the plate 4 in advance. Accordingly, there is a problem that the position of the lamp 1 bent due to factors other than the bending of the lamp 1 cannot be corrected by setting the backlight device horizontally upward, vertically, obliquely, and horizontally downward.
(2) Further, as described in the section (1), the large-sized LCD casing 3 or the reflecting plate 4 having a large size, for example, for 25 inches to 45 inches or the like is formed into a substantially box shape having an opening on the upper surface. In the backlight device in which the frame portion formed by press molding and molded with synthetic resin or the like is arranged around the opening portion, the gap between the electrodes of the lamp 1 is determined based on variations in processing accuracy during pressing of each component and assembly accuracy during assembly. When the mounting dimension on the case 3 side becomes smaller than the mounting dimension, the lamps 1, 1,... Arranged in parallel between the left and right side plates of the casing 3 or the reflecting plate 4 are, for example, in FIG. Deflection occurs in the form of a bridge in the direction of the plate 5 (upward) or on the adjacent lamp 1 side (front-rear direction) where the lamps 1 are arranged. Therefore, when the lamp 1 is bent in a bridge shape, the distance between the light diffusing plate and the lamp 1 is changed. When the lamp 1 is bent in the direction of the adjacent lamp 1, the distance between the adjacent lamps 1 (hereinafter referred to as lamps). Changes in pitch), resulting in uneven brightness.
JP 2001-210126 A (FIGS. 2, 4 to 5) JP 2001-266634 A (FIGS. 1, 9, and 11 to 12)

  The problem to be solved by the present invention is that in a large-sized backlight device or LCD, even if the fixed lamp 1 is bridged between the left and right side plates of the housing 1 or the reflecting plate 4 and the fixed lamp 1 is bent vertically and horizontally, it is easily linear. Thus, the backlight device, the LCD, and the light source holding member (lamp holder) that can prevent the increase in tube unevenness of the lamp 1 by correcting the lamp shape and correcting the lamp pitch are obtained.

The backlight device of the present invention has a reflective surface on the inner surface of a substantially rectangular casing that constitutes the lamp house, and a plurality of cylindrical light sources are disposed in the casing, on the opening of the casing. In a backlight device configured to obtain a transmitted light of the cylindrical light source on an illumination surface by providing a light transmission diffusion plate,
An O-ring made of an elastic material, fitted to the outer wall of the cylindrical light source;
A pair of holes formed in the reflective surface;
It is made of an elastic material and has a substantially Ω shape or a substantially reverse concave shape that forms an inner diameter portion or groove that holds the outer wall of the cylindrical light source, and the outer wall of the cylindrical light source is held in the inner diameter portion or groove. A holder having a mounting portion that engages with the pair of holes in a state ;
The holder holds the cylindrical light source at a position that does not overlap the O-ring .

In a backlight device according to another aspect of the present invention, the O-ring is held between the outer wall of the cylindrical light source and the reflecting surface, and the distance between the reflecting surface and the cylindrical light source is kept constant. It is characterized by being.

According to the backlight device of the present invention, the distance between the reflection plate or the bottom plate of the casing and the cylindrical light source can be kept constant by the O-ring and the holder attached to the lamp.

  A configuration of a backlight device, a liquid crystal display device (LCD), and a light source holding member (lamp holder) showing one embodiment of the present invention will be described below with reference to FIGS.

  1A and 1B are a perspective view of a lamp holder used in the backlight device and the LCD of the present invention, a cross-sectional view taken along the line AA in FIG. 1A, and FIGS. 2A, 2B, and 2C. FIGS. 1A and 1B are a perspective view showing an assembled structure of a lamp holder and an O-ring, a cross-sectional view taken along the line BB in FIG. 2A, and an arch portion for explaining another structure of the O-ring. Side sectional views, FIGS. 3A and 3B are schematic diagrams showing a method of arranging the lamp holder as viewed from the plane on the opening side of the housing serving as a lamp house, and FIGS. 4A and 4B are housings. FIG. 5 is a perspective view for explaining a method of preventing the bending of the cylindrical light source of the present invention, and FIGS. 6A and 6B are views of the present invention. It is the top view of a backlight apparatus, and CC sectional view taken on the line of FIG. 6 (A).

  Prior to the description of FIGS. 1A, 1B, and 4, the configuration of the backlight device and the LCD of the present invention and the cause of the lamp 23 will be described with reference to FIGS. 6 (A) and 6 (B) show the configuration of the backlight device and the LCD. In FIGS. 6 (A) and 6 (B), the backlight device 20 includes upper and lower side plates 21c, 21d, 21L, 21R that are substantially rectangular parallelepiped. A bottom plate 21b, a casing 21 formed by press-molding flanges 33 formed on four sides of the opening 21a integrally with the upper, lower, left and right side plates 21c, 21d, 21L, and 21R with aluminum or the like, and a bottom plate 21b of the housing 21 A reflector (reflecting plate) 22 having a reflecting surface on the side of the opening 21a is provided by punching out from the upper and lower left and right side plates 21c, 21d, 21L, 21R so as to form an inclined portion 34 inclined toward the opening 21a. Is done. The casing 21 and the reflecting plate 22 may be integrally formed as the casing 21 or the reflecting plate 22. In this case, white paint, aluminum foil, or the like is formed as the reflection plate 22 on the inner surface of the bottom plate 21 b of the housing 21 as a reflection surface.

  Cylindrical light source support portions 25L and 25R are formed between the left and right plates 21L and 21R and the inclined portion 34 of the reflection plate 22. As shown in FIG. 5, the cylindrical light source support portions 25L and 25R are fitted with an O-ring 36 made of elastic rubber or the like in a through-hole formed in the inclined reflecting plate 22 to form a cylindrical light source (lamp) 23. Is inserted into the center hole of the O-ring 36, and the electrode wire 37 led out from the stem 45 of the lamp 23 is soldered to the printed circuit board 30 or the like disposed on the bottom plate 21b of the housing 21. Yes.

  Between the cylindrical light source support portions 25L and 25R, as shown in FIGS. 6 (A) and 6 (B), a plurality of the light sources are arranged along the long side direction of the housing 21 and parallel to each other in the short side direction. For example, a light transmission diffusion plate 24 made of, for example, milky white acrylic resin and a light diffusion sheet 29 are sequentially stacked on the flange portion 33 that is provided with the lamps 3 in parallel and extends outward in the four directions of the opening 21a. The backlight device 20 is configured by being fixed on the opening 21a of the housing 21 by a predetermined method. A liquid crystal panel 28 is placed and fixed on the light diffusion sheet 29 of the backlight device 20. The LCD panel 28 is configured to be fixed on the light diffusion sheet 29 via a frame member 31 and a holding member 32. In FIG. 6A, reference numeral 35 denotes a lamp holder 35 of the present invention for correcting the deflection of the lamp 23. In this case, the case where the lamp holder 35 is randomly fixed to the portion of the lamp 23 where the deflection occurs. Show.

  The reason why the lamp 23 bends in the above-described backlight device and LCD will be described below. Now, for example, when the casing 21 is enlarged and becomes about 30 inches in size, the lamp 23 is elongated and has a small diameter (outer diameter of the tube wall, approximately 3 mmΦ). When 23 itself bends under its own weight, or the casing 21 or the reflector 22 is made of sheet metal, the machining accuracy error during pressing is about ± 0.1 to ± 0.5. When the lamp 23 is incorporated in the case 21 or the reflecting plate 22, both electrode ends of the lamp 23 are fixed to the printed circuit board 30. For example, a rubber hole is formed in the through hole formed in the inclined portion 34 of the reflecting plate 22. Even if the lamp 23 is held via the O-ring 36, it bends 38 in the XX and Y-Y directions (vertical and horizontal directions) perpendicular to the longitudinal direction of the lamp 23 like the lamp 23 shown on the front side of FIG. Is generated. As a result, the distance between the lamps 23 arranged side by side (lamp pitch) and the distance between the light transmission diffusion plate 24 and the reflection plate 22 and the lamp 23 cannot be kept constant, causing uneven brightness and providing a uniform illumination surface on the LCD. Although it cannot be produced, the present invention can eliminate such harmful effects.

  FIGS. 1A and 1B show a lamp holder 35 that can be used in an LCD and a backlight device according to an embodiment of the present invention. As shown in the perspective and side sectional views of FIGS. 1 (A) and 1 (B), a transparent or semi-transparent or white acrylic resin having a substantially tape-like flexibility, or a substantially tape-like transparent transparent material. Alternatively, a plurality of arched portions are formed on an elastic member such as semitransparent or white silicon rubber.

  The lamp holder 35 is formed by forming an arch portion 41 on an elongated, rectangular (tape-shaped) white polyethylene synthetic tree seed substrate 40 having a thickness of about 5 to 5 tmm or an elastic substrate 40 such as silicon rubber. The radius R of the ceiling portion of the inner diameter is selected to be slightly larger than the diameter of the outer wall of the lamp 23. Further, the height H of the arch inner diameter of the arch portion 41 is a normal distance formed between the reflecting plate 22 to which the lamp holder 35 is attached or the upper surface of the bottom plate 21b of the housing 22 as shown in FIG. The value is selected by substantially adding the value of the lamp diameter to the value of the gap G of about 1 to 3 mm.

  Further, the lamp pitch LP between the arch portions 41 is selected to be the same as the lamp pitch LP between the lamps 23 arranged in parallel on the bottom plate 21 b of the housing 21. In FIGS. 1A and 1B, four arch portions 41 are formed, but one or more appropriate numbers can be selected, and 42 is for attaching the lamp holder 35 to the reflecting plate 22 or the bottom plate 21b. It is a through hole or screw hole drilled at an appropriate position. Such a lamp holder 35 is inserted so as to press the arch portion 41 from the upper side of the lamp 23 bent in the horizontal (horizontal) direction or the vertical (vertical) direction like the X axis or the Y axis in FIG. Then, the lamp portion bent in the horizontal direction or the vertical direction can straightly correct the deflection of the tube wall of the lamp 23 in the predetermined direction by the arch inner diameter of the arch portion in the predetermined direction.

  2A and 2B show a lamp holder 35 having another configuration of the present invention. A gap G generated between the lamp 23 described in FIG. 1B and the reflecting plate 22 or the bottom plate 21b is shown. If the O-ring 36 is fitted on the outer wall of the bent portion of the lamp 23 in advance to close it and the arch inner diameter portion of the arch portion 41 of the lamp holder 35 is inserted over the juxtaposed O-ring 36, The diameter G is in contact with the upper surface of the reflecting plate 22 or the bottom plate 21b, and a normal gap G value of about 1 to 3 mm formed between the reflecting plate 22 and the upper surface of the bottom plate 21b of the housing 22 is kept constant. Can keep.

  2 (A) and 2 (B), an O-ring 36 is fitted on the outer wall of the bent portion of the lamp 23 in advance, and the arch inner diameter portion of the arch portion 41 of the lamp holder 35 is placed on the juxtaposed O-ring 36. The O-ring 36 is inserted into a U-shaped member 43 made of a U-shaped elastic member as shown in FIG. 2C, and the U-shaped member 43 is inserted into the groove 44 formed in the arch inner diameter portion of the arch portion 41. If it does so, it is not necessary to fit the O-ring 36 to the outer wall of the bent portion of the lamp 23 in advance before fixing the lamp 23, and the lamp holder 35 is fixed to the reflecting plate 22 or the bottom plate 21b. The U-shaped member 43 can be inserted.

3A, 3B and 4A, 4B are a schematic plan view of the housing 21 and a side sectional view of the lamp holder for explaining the mounting position and mounting method of the lamp holder 35. FIG. In the case of FIG. 3 (A), the Y-axis direction (downward) is the approximate center position of the lamp 23 in the longitudinal direction.
The three arch portions 41 are formed on the lamp 23 bent in the right direction, and the three lamp holders 35 are pressed down by the arch inner diameter portion of the arch portion 41 of the lamp holder 35 to correct the deflection of the lamp 23. This is a case where the lamps 23 are arranged in a straight line.

  In the case of FIG. 3 (B), the deflection of the lamps 23 in different parts is corrected by making the arrangement of the lamp holders 35 staggered, and the fixing method to the reflecting plate 22 or the bottom plate 21b is shown in FIG. As shown in FIG. 4A, this is a case where screws 46 are screwed from above to the reflecting plate 22 or the bottom plate 21b through the through holes 42 formed in the lamp holder 35. FIG. 4B shows the reflecting plate 22 or the bottom plate. This is a case where the screw hole 42 formed in the lamp holder 35 is screwed from below through the through hole formed in 21b. Of course, these fixing methods include rivet bonding, adhesive bonding, double-sided tape bonding, or a fixing pin formed integrally with the substrate on the bottom surface of the lamp holder 35 and inserted into a through-hole formed in the reflector 22. May be. As for the material of the lamp holder 35 described above, the white polyethylene synthetic tree seed substrate has been described. In short, a transparent, translucent, and white material that does not cause a shadow on the illumination surface of the LCD or the backlight device may be selected.

  The lamp holder 35 described above simultaneously presses the deflections 38 of the plurality of lamps 23 and corrects the deflection to a linear shape. However, as shown in FIGS. 7 (A), (B), and (C), one or one deflection 38 part is provided. You may make it correct | amend. The lamp holder 35 shown in FIG. 7A has a substantially Ω-shaped arch portion 41 formed on a tape-like substrate 40 to form an arch inner diameter portion 51 so that the lamp 23 can be pressed. In FIG. 7 (B), the arch portion 41 is formed as one rectangular bridge portion 49, and the arch inner diameter portion 51 is formed. Is a rectangular groove 48. These can be formed of a spring material such as synthetic resin, metal, and elastic phosphor bronze. FIG. 7C shows a dome-shaped inner diameter groove 50 in which the ceiling portion of the groove portion 48 of FIG.

  FIG. 7D shows a case in which a plurality of groove portions 48 are formed at a lower portion of a base 51 formed on a substantially rectangular parallelepiped and are aligned with a plurality of ramp pitches LP. A through hole 42 for fixing the holder 35 is provided. 7E shows an L-shaped or Z-shaped lamp holder 35 on the upper and lower side plates 21c and 21b of the casing 21. The lamp holder 35 is configured to press the plurality of lamps arranged in parallel as described in FIG. One or more pins 55 for preventing slack in the downward direction of the light transmission diffusion plate 24 are provided on the top plate portion of the base 52 formed in a letter shape and fixed through the mounting brackets 53 and 54. The dome-shaped inner diameter portion 50 is formed in accordance with a plurality of lamps arranged side by side on the casing 21. The inner diameters of the inner diameter portion 51, the groove portion 48, and the dome-shaped inner diameter groove 50 of the arch portion described above are selected according to the outer diameter of the lamp 23 to be pressed.

FIGS. 8A and 8B show still another configuration of the lamp holder 35 of the present invention. FIG. 8A shows a relatively elastic spring steel material such as synthetic resin and piano steel, which is approximately Ω. the mounting portion 47 formed on Jo inserted in a substantially rectangular through hole 56 which drilled the bottom plate 21b or reflection plate 22 of the housing 21, push the glass tube wall of the lamp 23, the lamp holder 35 is O The lamp 23 is held at a position where it does not overlap the ring 36 . According to such a configuration, the upper and left and right sides of the arch inner diameter portion 51 of the lamp holder 35 hold down the glass tube wall of the lamp 23 and the lower side is inserted into the lamp 23 in advance as shown in FIG. Therefore, the distance between the reflecting plate 22 or the bottom plate 21b and the lamp 23 can be kept constant.

In the case of FIG. 8B, the lamp holder 35 is bent and formed in a square shape (reverse concave shape) as in FIG. Also in this case, the upper and left and right sides of the groove portion hold down the glass tube wall of the lamp 23, and the lower side is the thickness of the lower side of the O-ring 36 previously inserted into the lamp 23 as shown in FIG. Since it is held at D2, the distance between the reflector 22 or the bottom plate 21b and the lamp 23 can be kept constant.

  According to the backlight device and the LCD array lamp holder of the present invention, even in the enlarged backlight device and LCD, the fixed lamp 1 is bridged between the left and right side plates of the housing 1 or the reflection plate 4 so that the fixed lamp 1 is bent vertically and horizontally. However, it is possible to easily correct the bent lamp portion or the portion where the bending is likely to occur in a straight line and correct the lamp pitch so that the tube unevenness on the illumination surface of the light collecting sheet of the backlight device and the LCD It is possible to provide an LCD, a backlight device, and a lamp holder in which tube unevenness on the illumination surface of the liquid crystal cell is improved.

It is a perspective view of the light source holding member used for the liquid crystal display device which shows one example of this invention, and a backlight apparatus. It is a perspective view which shows the other structure of the light source holding member used for the liquid crystal display device and backlight apparatus of this invention. It is a top view which shows the attachment state of the light source holding member attached to the liquid crystal display device and backlight apparatus of this invention. It is a sectional side view which shows the attachment state of the light source holding member attached to the liquid crystal display device and backlight apparatus of this invention. It is a perspective view of the principal part for demonstrating the bending prevention method of the cylindrical light source of the liquid crystal display device of this invention, and a backlight apparatus. 1A and 1B are a plan view and a side sectional view of a liquid crystal display device and a backlight device according to an embodiment of the present invention. It is a perspective view which shows the other structure of the light source holding member used for the liquid crystal display device and backlight apparatus of this invention. It is the perspective view and side sectional view which show other structure of the light source holding member used for the liquid crystal display device and backlight apparatus of this invention. It is the perspective view and side sectional view which show the whole holding | maintenance sectional drawing of the conventional liquid crystal display device and a backlight apparatus, and the holding method of a light source holding device. It is a perspective view which shows the general | schematic perspective view of the other conventional liquid crystal display device and a backlight apparatus, and the holding method of a light source holding device.

Explanation of symbols

  20 ... Backlight device, 21 ... Housing, 21a ... Opening, 21b ... Bottom, 21c ... Upper plate, 21d ... Lower plate, 21L ... Left plate, 21R ... Right plate, 22 ··· Reflector, 23 ··· Cylindrical light source (lamp), 24 ··· Light transmission diffuser plate, 29 ··· Light diffusion sheet, 35 ··· Light source holding member (lamp holder)

Claims (2)

The inner surface of a substantially rectangular casing constituting the lamp house has a reflecting surface, a plurality of cylindrical light sources are disposed in the casing, and a light transmission diffuser plate is provided on the opening of the casing to provide illumination. In the backlight device configured to obtain the transmitted light of the cylindrical light source on the surface,
An O-ring made of an elastic material, fitted to the outer wall of the cylindrical light source;
A pair of holes formed in the reflective surface;
It is made of an elastic material and has a substantially Ω shape or a substantially reverse concave shape that forms an inner diameter portion or groove that holds the outer wall of the cylindrical light source, and the outer wall of the cylindrical light source is held in the inner diameter portion or groove. A holder having a mounting portion loosely fitted in the pair of holes in a state ;
The backlight device characterized in that the holder holds the cylindrical light source at a position not overlapping the O-ring . 2. The back according to claim 1, wherein the O-ring is held between an outer wall of the cylindrical light source and the reflecting surface, and a distance between the reflecting surface and the cylindrical light source is kept constant. Light equipment.

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