JP2008204818A - Backlighting device and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backlight device and a display device capable of alleviating creaking noise generated in case a thermal expansion coefficient differs in a reflecting plate and a diffusion plate, through restraint of close adhesion of the reflecting plate and the diffusion plate of the backlight. <P>SOLUTION: The backlight device is so structured that a protruded part 11d protruded toward a front direction is provided at a support part 11b of a support stand 11 fitted inside a backlight chassis 1, a through-hole 2d is opened at a flange part 2c of the reflecting plate 2 supported by the support part 11b, and the protruded part 11d is inserted into the through-hole 2d so as to have the protruded part 11d in contact with the diffusion plate 3 provided in opposition to the reflecting plate 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a backlight device and a display device that reduce squeaking noise that occurs when a backlight is turned on or off.

  In a backlight device used in a conventional liquid crystal display device, a casing that houses the backlight, a holding frame provided inside the casing, and a holding frame that is held by the holding frame And a reflecting plate that reflects the light of the backlight, and a diffusion plate that is provided to face the reflecting plate and diffuses the light of the backlight. The reflection plate includes a side portion that rises toward the diffusion plate and a flange portion that continues to the side surface portion, and the flange portion and the diffusion plate are in close contact with each other (see Patent Document 1).

In the liquid crystal display device described in Patent Document 1, the diffusion plate and the reflection plate are in close contact with each other, and the two are separated during the assembly of the liquid crystal display device, and the assembly operation is interrupted. The efficiency was prevented from decreasing.
JP 2004-55182 A

  In the liquid crystal display device described in Patent Document 1, a cold cathode tube is used as a light source of a backlight housed in a housing. When the cold cathode tube is turned on, the reflector and the diffusion plate located in the vicinity of the cold cathode tube absorb heat generated by the cold cathode tube, and release heat when the cold cathode tube is turned off. When the tube is turned on or off, the reflecting plate and the diffusing plate expand and contract due to thermal changes.

  When the materials of the reflecting plate and the diffusing plate are different, the coefficients of thermal expansion of the two are also different, resulting in a difference in expansion and contraction between the two. When there is a difference in expansion and contraction, friction occurs between the two and a squeaking noise is generated. Since both are in close contact with each other, there is a problem that the squeaking noise becomes a level that cannot be ignored.

  The present invention has been made in view of such circumstances, and a protrusion is provided on a support base that supports the reflector, and a protrusion through which the protrusion is inserted is provided in the reflector so that the protrusion penetrates. An object of the present invention is to provide a backlight device that can pass through the portion and contact the diffusion plate facing the reflection plate to suppress adhesion between the reflection plate and the diffusion plate and reduce squeaking noise.

  In the present invention, by opening a hole as the through portion, the protrusion is inserted into the hole, the protrusion is brought into contact with the diffusion plate, and adhesion between the reflection plate and the diffusion plate is suppressed. An object of the present invention is to provide a backlight device capable of reducing squeaking noise.

  Further, the present invention provides a notch as the penetrating portion, and inserts the protruding portion into the notched portion to bring the protruding portion into contact with the diffusing plate, thereby suppressing adhesion between the reflecting plate and the diffusing plate. An object of the present invention is to provide a backlight device capable of reducing sound.

  Another object of the present invention is to provide a display device that can reduce the squeaking noise by providing any one of the backlight devices on the back side of the display unit.

  A backlight device according to the present invention includes a casing that houses a backlight and a backlight chassis that includes a support base provided in the casing, and is supported by the support base and reflects light. In a backlight device provided with a reflecting plate that is opposed to the reflecting plate and that diffuses light, a protrusion is provided on a portion of the support base that supports the reflecting plate. A through-hole for inserting the protruding portion is provided in the reflecting plate, and the protruding portion is inserted into the through-hole to be in contact with the diffusion plate.

  In the present invention, a protrusion is provided on the support base that supports the reflector, and a penetrating portion into which the protrusion is inserted is provided in the reflector so that the protrusion passes through the penetrating portion to the reflector. It contacts the opposing diffusion plate and suppresses the close contact between the reflection plate and the diffusion plate.

  In the backlight device according to the present invention, the through portion is a hole.

  In the present invention, by opening a hole as the penetrating portion, the protruding portion is inserted into the hole, the protruding portion is brought into contact with the diffusion plate, and adhesion between the reflection plate and the diffusion plate is suppressed. .

  The backlight device according to the present invention is characterized in that the penetrating portion is a notch.

  In the present invention, by providing a notch as the penetrating portion, the protruding portion is inserted into the notched portion, the protruding portion is brought into contact with the diffusion plate, and adhesion between the reflecting plate and the diffusion plate is suppressed.

  In addition, a display device according to the present invention includes a display unit and the above-described backlight device provided on the back side of the display unit.

  In the present invention, by providing any one of the backlight devices on the back side of the display unit, adhesion between the reflector and the diffusion plate of the backlight device is suppressed, and the backlight is turned on or The squeaking noise that occurs when the light is turned off is reduced.

  In the backlight device according to the present invention, the protrusion is provided on the support base that supports the reflector, and the protrusion is inserted into the reflector so that the protrusion passes through the penetration. The diffusion plate facing the reflection plate is brought into contact, the adhesion between the reflection plate and the diffusion plate is suppressed, and the squeaking noise caused by the friction between the reflection plate and the diffusion plate can be reduced.

  Further, in the backlight device according to the present invention, by opening a hole as the penetrating portion, the protruding portion is inserted into the hole, the protruding portion is brought into contact with the diffusion plate, and the reflection plate and the diffusion plate are It is possible to suppress adhesion and reduce the squeaking noise caused by the friction between the reflecting plate and the diffusing plate.

  Further, in the backlight device according to the present invention, by providing a notch as the penetrating portion, the projecting portion is inserted into the notch, the projecting portion is brought into contact with the diffuser plate, and the reflecting plate and the diffuser plate are in close contact with each other. It is possible to suppress the squeaking noise caused by the friction between the reflecting plate and the diffusing plate.

  Further, in the display device according to the present invention, by providing one of the backlight devices on the back side of the display unit, the close contact between the reflection plate and the diffusion plate of the backlight device is suppressed, and the backlight is turned on. It is possible to reduce the squeaking sound that occurs when it is turned off or when it is turned off, and to relieve the discomfort caused by the squeaking sound.

(Embodiment 1)
Hereinafter, a backlight device and a display device according to the present invention will be described in detail with reference to the drawings illustrating Embodiment 1. 1 is a cross-sectional view of a backlight device and a display device according to Embodiment 1, FIG. 2 is a front view of a support base, and FIG. 3 is a front view of a reflector.

  In FIG. 1, reference numeral 1 denotes a backlight chassis of a backlight device and a display device, and the backlight chassis 1 is a rectangular casing that houses cold cathode tubes 31, 31,. 10 and a frame-like shape that is provided along the side surface of the housing 10 inside the housing 10 and supports a reflector 2, a diffusion plate 3, optical sheets 4, 5 and a liquid crystal panel 6 described later. And a support base 11.

  The support base 11 is connected to the rectangular frame portion 11a provided near the front side along the side surface portion of the housing 10, and is connected to the longitudinal side surface at a right angle along the longitudinal side surface of the frame portion 11a. A plate-like support portion 11b extending to the inside for an appropriate length, and a plate-like spacer portion 11c that is connected to the support portion 11b at a right angle and separates the support portion 11b and the back surface portion of the housing 10. And. Conical protrusions 11d, 11d,... Protruding in the front side are equally arranged on the support part 11b in the longitudinal direction.

  A rectangular reflector 2 for reflecting light from the cold cathode tubes 31, 31,... Is supported on the support base 11. The reflecting plate 2 is connected to the rectangular bottom surface portion 2a facing the back surface portion of the housing 10 in the center of the support base 11 and the longitudinal edge of the bottom surface portion 2a, and the spacer The side part 2b which stood up to the substantially same height as the part 11c, and the collar part 2c which extended outside for a suitable length connected to this side part 2b, and are supported by the said support part 11b are provided. In the flange 2c, circular through holes 2d, 2d,... For inserting the protrusions 11d, 11d,... Are opened, and the tip of the protrusion 11d is slightly extended from the through hole 2d. It protrudes.

  A diffusing plate 3 for diffusing light from the cold cathode tubes 31, 31,... Is provided opposite to the front surface of the reflecting plate 2, and the diffusing plate 3 is in contact with the protruding portion 11d. The cold cathode tube 31 is supported between the diffusion plate 3 and the reflection plate 2 by a support clip 30 provided in the housing 10, and the backlight chassis 1, the reflection plate 2, and the diffusion plate 3. The support clip 30 and the cold cathode tube 31 constitute a backlight device.

  Two optical sheets 4 and 5 and a liquid crystal panel 6 are stacked on the front surface of the diffusion plate 3. The bezel 7 is attached to the front surface of the casing 10 so as to contact the front peripheral edge of the liquid crystal panel 6, and the backlight device, the optical sheets 4, 5, the liquid crystal panel 6 and the bezel 7 constitute the display device. is doing.

  In the backlight device and the display device according to the first embodiment, the cold cathode tube 31 generates heat when it is turned on, so that the diffusion plate 3 and the reflector 2 are thermally changed by turning on or off the cold cathode tube 31. Occurs, and the diffusion plate 3 and the reflection plate 2 expand and contract. When the coefficients of thermal expansion of the two are different, there is a difference between the expansion and contraction of the two. However, by providing the support 11 with the protrusion 11d and opening the through hole 2d in the flange 2c, the diffusion plate 3 can be used as the protrusion 11d. The contact between the diffusion plate 3 and the flange portion 2c is suppressed, and the squeaking noise caused by friction between the diffusion plate 3 and the flange portion 2c can be reduced.

  The support base 11 may be formed integrally with the housing 10. Further, the shape of the protruding portion 11d is not limited to a conical shape, and may be a protruding shape such as a column shape. The shape of the through hole 2d is not limited to a circular shape, and a shape such as a quadrangular shape that allows other protruding portions 11d to be inserted. If it is good.

  Further, the support portion 11b of the support base 11 may be connected to the entire side surface of the frame portion 11a, the side surface portion 2b of the reflector 2 may be connected to the entire circumference of the bottom surface portion 2a, and the flange portion 2c may be connected to the side surface portion 2b. The spacer portion 11c is not limited to a plate shape but may be a square shape. An LED lamp may be used as the light source. The display device may be either a transmissive liquid crystal display device or a transflective liquid crystal display device. The reflection plate 2, the diffusion plate 3, and the cold cathode tube 30 constitute a backlight.

(Embodiment 2)
Hereinafter, a liquid crystal display device according to the present invention will be described in detail with reference to the drawings showing a second embodiment. FIG. 4 is a front view of the reflector of the backlight device and the display device according to the second embodiment.

  A rectangular reflector 2 for reflecting light from the cold cathode tubes 31 is supported on a support 11 of the liquid crystal display device. The flange 2c of the reflecting plate 2 is provided with substantially circular cutouts 20d, 20d,... For inserting the projections 11d, 11d,..., And the tip of the projection 11d extends from the center of the cutout 20d. It protrudes slightly.

  In the backlight device and the display device according to Embodiment 2, by providing the notch 20d in the flange 2c, the protrusion 11d is inserted into the notch 20d, and the protrusion 11d is brought into contact with the diffusion plate 3. Thus, it is possible to suppress the close contact between the reflecting plate 2 and the diffusing plate 3 and to reduce the squeaking noise caused by the friction between the reflecting plate 2 and the diffusing plate 3.

  Among the configurations of the liquid crystal display device according to the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

2 is a cross-sectional view of the backlight device and the display device according to Embodiment 1. FIG. 3 is a front view of a backlight device and a support base of the display device according to Embodiment 1. FIG. FIG. 3 is a front view of the backlight device and the reflecting plate of the display device according to the first embodiment. It is a front view of the reflecting plate of the backlight apparatus and display apparatus which concern on Embodiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Backlight chassis 2 Reflector 2a Bottom surface part 2b Side surface part 2c Edge part 2d Through-hole 3 Diffusion plate 4, 5 Optical sheet 6 Liquid crystal panel 7 Bezel 10 Housing | casing 11 Support stand 11a Frame part 11b Support part 11c Spacer part 11d Projection part 20d Notch 30 Support clip 31 Cold cathode tube

Claims (4)

A backlight chassis including a casing that houses a backlight and a support base provided in the casing, a reflector that is supported by the support base and reflects light, and the reflector In a backlight device that is provided facing and includes a diffusion plate that diffuses light,
A protrusion is provided on a portion of the support base that supports the reflecting plate, and a through portion for inserting the protruding portion is provided on the reflecting plate, and the protruding portion is inserted into the through portion. A backlight device in contact with the diffusion plate.   The backlight device according to claim 1, wherein the penetrating portion is a hole.   The backlight device according to claim 1, wherein the penetrating portion is a notch.   A display device comprising: a display unit; and the backlight device according to claim 1 provided on a back side of the display unit.

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