Source: https://patents.google.com/patent/JP4282371B2/en
Timestamp: 2020-07-02 07:38:30
Document Index: 389231783

Matched Legal Cases: ['art 18', 'art 18', 'art 18', 'art 26', 'art\n18', 'art\n19', 'art\n27']

JP4282371B2 - Backlight unit, liquid crystal display device, and lamp replacement method - Google Patents
Backlight unit, liquid crystal display device, and lamp replacement method Download PDF
JP4282371B2
JP4282371B2 JP2003140226A JP2003140226A JP4282371B2 JP 4282371 B2 JP4282371 B2 JP 4282371B2 JP 2003140226 A JP2003140226 A JP 2003140226A JP 2003140226 A JP2003140226 A JP 2003140226A JP 4282371 B2 JP4282371 B2 JP 4282371B2
JP2003140226A
JP2004342550A (en
伸一郎 小野
弘和 福吉
2003-05-19 Application filed by Ｎｅｃ液晶テクノロジー株式会社 filed Critical Ｎｅｃ液晶テクノロジー株式会社
2003-05-19 Priority to JP2003140226A priority Critical patent/JP4282371B2/en
2004-12-02 Publication of JP2004342550A publication Critical patent/JP2004342550A/en
2009-06-17 Publication of JP4282371B2 publication Critical patent/JP4282371B2/en
239000004973 liquid crystal related substances Substances 0.000 title claims description 77
230000002265 prevention Effects 0.000 description 14
A63H29/08—Driving mechanisms actuated by balls or weights
The present invention relates to a backlight unit, a liquid crystal display device, and a lamp replacement method.
Liquid crystal display devices are widely used as OA equipment and television monitors because of their small size, thinness, and low power consumption. As shown in FIG. 30, this liquid crystal display device includes a liquid crystal panel 6 in which liquid crystal is sandwiched between opposing transparent substrates, a substrate 7 connected to the liquid crystal panel 6 through a TCP 8, and a liquid crystal panel 6. Main components are a backlight unit 3 that generates backlight light to illuminate and a casing 4 (shield front) that supports them.
Further, as shown in FIG. 31, the backlight unit 3 includes a lamp 10 serving as a light source, a power supply circuit such as an inverter board 12 and a return board 13 that supply power to the lamp 10, and a return cable 14 that connects these boards. A lamp support base 28 that holds the lamp 10, a reflector 29 that reflects the light of the lamp 10 in the direction of the liquid crystal panel, a diffuser plate 19 that makes the light of the lamp 10 uniform illumination light, an optical sheet 20, and the like As shown in FIG. 32, the optical member and the casing (backlight chassis 21) are used, and as shown in FIG. 32, each component is integrally held by the backlight chassis 21 and the reflector 29 provided with the spacer 30. Yes.
Among the elements constituting the liquid crystal display device 1, the life of the liquid crystal panel 6 is long, whereas the life of the lamp 10 constituting the backlight unit 3 is relatively short. If this happens, the lamp 10 needs to be replaced. In that case, in the conventional liquid crystal display device, the entire backlight unit 3 in which the lamp 10, the diffusion plate 19, the optical sheet 20, and the like are integrated is replaced.
When the backlight unit 3 is held in the housing 4 of the liquid crystal display device 1 as shown in FIG. 30, first, the liquid crystal display device 1 itself must be disassembled and the backlight unit 3 must be removed. , The replacement work takes time. In order to facilitate replacement of the backlight unit 3, Japanese Utility Model Laid-Open No. 7-16925 discloses a liquid crystal display device having a liquid crystal display panel, a backlight unit, and a housing. There is disclosed a structure in which an attachable / detachable opening having a possible size is provided, an end of the backlight unit is closed at the attachable / detachable opening, and an engaging portion that is engaged with a peripheral edge of the attachable / detachable opening is provided.
Japanese Utility Model Publication No. 7-16925 (pages 5-8, FIG. 1)
However, in the above-described conventional liquid crystal display device, in order to replace the lamp 10, the liquid crystal display device 1 is first disassembled and the backlight unit 3 is removed, and then the backlight unit 3 is disassembled and the lamp 10 is removed. There is a problem that the replacement work takes time. Further, in order to replace the entire backlight unit 3, optical members such as the diffusion plate 19 and the optical sheet 20 other than the lamp 10 to be replaced, and component parts such as the lamp support 28, the reflector 29, and the backlight chassis 21 are also discarded. There is a problem that wastefulness and cost of replacement parts increase.
Further, when the backlight unit 3 is detached from the liquid crystal display device 1, the back surface (incident surface of the backlight light) of the liquid crystal panel 6 is exposed, and foreign matters such as dust adhere to the liquid crystal panel 6 and the display quality is remarkably lowered. Problem arises. That is, since uniform light is incident on the back surface of the liquid crystal panel 6 by the diffusion plate 19 and the optical sheet 20 of the backlight unit 3, if the backlight light is blocked by a foreign object, the shadow is visually recognized. .
In the backlight unit 3, the lamp 10 is fixed by a structure such as the reflecting plate 29 and the backlight chassis 21. However, in order to reduce the weight of the liquid crystal display device 1, it is necessary to reduce the weight of these structures. Usually, it is formed of a thin metal plate. Here, when the size of the liquid crystal display device 1 is small, sufficient strength can be maintained. However, when the size of the liquid crystal display device 1 is increased, the structure is easily deformed, and as a result, transportation and handling become difficult. Arise.
Such a problem becomes more conspicuous not only in the above-described liquid crystal display device having a display surface on one side but also in a double-sided liquid crystal display device in which display surfaces are provided on both front and back surfaces. The structure of the double-sided liquid crystal display device will be described. As shown in FIG. 33, the double-sided liquid crystal display device 1a includes a double-sided backlight unit 3a that irradiates backlight light in both the front and back directions, and a double-sided backlight unit 3a. It consists of liquid crystal panels 6a and 6b installed on each surface and a casing (shield front 4a and 4b) for holding each liquid crystal panel 6 on the double-sided backlight unit 3a. The double-sided backlight unit 3a includes a lamp 10, a power supply circuit unit (inverter board 12, return board 13, and return cable 14) that supplies power to the lamp 10, and a lamp support base 28a that holds the lamp 10 from both sides. 28b, diffusion plates 19a and 19b for diffusing the light of the lamp 10, optical sheets 20a and 20b for making the diffused light uniform illumination light, and a backlight casing (backlight chassis 21a and 21b), As shown in FIG. 35, each component is integrally held by the backlight chassis 21a and the backlight chassis 21b.
In the double-sided liquid crystal display device 1a having such a structure, the number of parts of the double-sided backlight unit 3a is large and the structure is complicated. Therefore, the replacement work of the lamp 10 is more time consuming than the liquid crystal display device 1 having a display surface on one side. In addition, if the entire double-sided backlight unit 3a is replaced, many optical members and structures are wasted. Further, in the double-sided liquid crystal display device 1a, the double-sided backlight unit 3a is also thick, so that a large gap is formed when the double-sided backlight unit 3a is removed from the double-sided liquid crystal display device 1a, and the backlight light incident on each of the liquid crystal panels 6a and 6b. Since foreign matter is likely to adhere to the surface, display quality is likely to deteriorate. Furthermore, since the size of the double-sided backlight unit 3a is increased, the strength cannot be maintained, and the structure is easily deformed during transportation and handling. Therefore, the double-sided liquid crystal display device is more prominent when replacing the lamp.
The present invention has been made in view of the above-mentioned problems, and its main purpose is that lamp replacement can be performed easily and at a low cost, and display quality is deteriorated due to adhesion of foreign matters during replacement. An object of the present invention is to provide a backlight unit, a liquid crystal display device, and a lamp replacement method that can be suppressed.
In order to achieve the above object, a backlight unit of the present invention includes a plurality of rod-shaped lamps arranged at a predetermined interval, a circuit board that supplies power to the lamp, and substantially uniform illumination light. In a backlight unit including an optical member and a housing, an exchange unit in which at least the lamp and the circuit board are supported by a frame-like support means, and the housing holding at least the optical member; Is formed separately, and the exchange unit is held in the casing so that it can be pulled out. The frame-shaped support means includes a frame portion that supports both end portions of the lamp at two opposite sides, and a substrate mounting portion that is provided outside the frame portion and supports the circuit board, and has the same shape. The two frame-shaped support means, and one end of the lamp is sandwiched between the one frame-shaped support means and the other frame-shaped support means opposed to each other in an inverted state. Supported Is.
Further, in the present invention, the replacement unit covers at least the opening of the housing serving as the outlet of the replacement unit when viewed from the direction in which the replacement unit is pulled out, and prevents leakage of light from the lamp. A structure having one light-shielding means, or a guide portion that slidably contacts the frame portion of the frame-shaped support means and the inner surface of the housing on the frame-shaped support means and the housing; The replacement unit has at least a gap between the frame portion and the housing in the guide portion as viewed from a direction orthogonal to the pull-out direction of the replacement unit and parallel to a plane formed by the frame portion. A structure comprising a second light-shielding means that covers and prevents light leakage of the lamp, or a fitting that can slide in a state of being engaged with the frame portion and the housing of the frame-shaped support means Part It can be configured to include.
In the present invention, the casing may be divided and formed corresponding to each side of the optical member, and each of the casings may include a recess that holds the optical member.
In the liquid crystal display device of the present invention, a liquid crystal panel is disposed on the front and back surfaces of the backlight unit, and display surfaces are formed on both the front and back surfaces.
As described above, according to the present invention, when the lamp serving as the light source of the backlight is replaced, not the entire backlight unit but the power supply circuit unit that supplies power to the lamp is held in the frame. Since only the replacement unit can be pulled out and replaced, the replacement work can be facilitated, and the optical member and the housing such as the diffusion plate and the optical sheet can be used as they are. Cost can be reduced. In addition, the diffuser plate and optical sheet remain incorporated in the liquid crystal display device body when the lamp is replaced, so that the backlight incident surface of the liquid crystal panel is not exposed, and foreign substances such as dust adhere to the display quality during replacement work. Can be avoided. Furthermore, since the replacement unit is smaller and lighter than the entire backlight unit, it can be easily transported and handled.
In a preferred embodiment of the liquid crystal display device according to the present invention, a lamp serving as a light source of backlight light and a power supply circuit unit such as an inverter board, a return board, and a return cable that supply power to the lamp are lamp-supported. A lamp set supported by a frame, and a backlight chassis that holds an optical member such as a diffusion plate and an optical sheet for diffusing backlight light in a diffusion plate holding recess and holds the lamp set so that it can be inserted and removed, By making the lamp replaceable in the smallest unit, the replacement work is facilitated and the cost required for the replacement is reduced, and by leaving the optical member, the adhesion of foreign matter to the liquid crystal panel is prevented and the display quality is lowered. Can be suppressed.
In order to describe the above-described embodiment of the present invention in more detail, examples of the present invention will be described with reference to the drawings. In addition, although the following examples show the case where the backlight unit of the present invention is applied to a double-sided liquid crystal display device, the present invention is not limited to the following examples, and a normal display surface is provided only on one side. The same applies to a liquid crystal display device.
First, a backlight unit, a liquid crystal display device, and a lamp replacement method according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing the structure of a double-sided liquid crystal display device manufactured using the backlight unit according to the first embodiment, FIG. 2 is a perspective view showing the structure of the backlight unit, and FIG. 3 is an exploded view thereof. FIG. 4 to 6 are sectional views showing the structure of the backlight unit of this embodiment, and FIG. 7 is a sectional view for explaining light leakage of the backlight.
As shown in FIG. 1, a lamp unit 5 in the center of the figure is detachably held in backlight chassis 21a, 21b holding optical members such as diffusers 19a, 19b and optical sheets 20a, 20b, and is a backlight unit. And the liquid crystal panels 6a and 6b to which the substrates 7a and 7b are connected via the TCPs 8a and 8b, respectively, are arranged on both sides of the backlight unit. The backlight unit and the liquid crystal panels 6a and 6b It is fixed by shield fronts 4a, 4b). The present invention is characterized by the structure of the backlight unit 3, and the structure of the components of the liquid crystal display device other than the backlight unit such as the liquid crystal panel 6 and the housing 4 is not particularly limited. Hereinafter, a specific structure of the backlight unit will be described.
FIG. 2 is a perspective view showing a state in which the lamp set 5 is taken out from the backlight chassis 21 constituting the backlight unit 3 of the present embodiment, and FIG. 3 is an exploded view showing the configuration of the backlight unit 3. As shown in FIG. 3, the backlight unit 3 includes a plurality of rod-shaped lamps 10 serving as a light source of backlight light that illuminates the liquid crystal display panel 6, holding rubbers 11 attached to both ends of the lamp 10, and the lamp 10. A circuit element (hereinafter referred to as a power supply circuit section) such as an inverter board 12 for supplying power to the power supply, a return board 13 and a return cable 14 for connecting them, and both ends of the lamp 10 are sandwiched from both front and back surfaces. Lamp support frames 16a and 16b for holding the light 10, diffusion plates 19a and 19b for diffusing the light from the lamp 10, and optical sheets 20a and 20b made of a diffusion sheet or a lens sheet for making the diffused light uniform illumination light; And a casing of the backlight (backlight chassis 21a, 21b), the lamp 10, the power supply circuit section, and the lamp support frame 16 , Lamp set 5 is formed by the 16b.
As shown in FIG. 2, an opening is formed on one surface (upper surface in the figure) of the backlight chassis 21 holding the diffusion plate 19 and the optical sheet 20, and the lamp set 5 can be inserted and removed from the opening. Has been. In addition, the said structure shows an example of the backlight unit 3 of a present Example, For example, the number and shape of the lamp | ramp 10, arrangement direction, the shape and arrangement | positioning of the inverter board | substrate 12 or the return board | substrate 13, its connection method, etc. It can change suitably and may contain constituents other than the element of a figure.
Next, the detailed structure of the backlight unit 3 will be described with reference to FIGS. FIG. 4 is a diagram showing the structure of the AA cross section of FIG. 2, and as shown in FIG. 4, the lamp 10 is sandwiched and fixed between the lamp support frames 16a and 16b by holding rubber 11 portions at both ends thereof. The inverter board 12 and the return board 13 are attached to a board attachment portion 17 extending on both sides of a lamp support frame (here, the lamp support frame 16b), and the lamp 10 and the power supply circuit portion can be detached from the backlight chassis 21 together. It is like that. Further, the diffusion plate 19 and the optical sheet 20 are fixed by being fitted into U-shaped diffusion plate support recesses 25 provided in the backlight chassis 21 a and 21 b, respectively. The plate 19 and the optical sheet 20 remain on the backlight chassis 21 side.
FIG. 5 is a view showing the structure of the BB cross section of FIG. 2. As shown in FIG. 5, the lamp support frame 16 can be inserted into the space formed by the backlight chassis 21. Here, when the backlight unit 3 is divided into the lamp set 5 and the backlight chassis 21, in order to insert and remove the lamp set 5 from and into the backlight chassis 21, a certain gap is required between them. The size of the gap varies due to manufacturing variations. When this gap becomes large, as shown in FIG. 7, there is a concern that the light from the lamp 10 leaks from the gap, resulting in a decrease in luminance or uneven luminance. In addition, foreign matter such as dust is likely to enter from the gap, and if it accumulates inside, it may be a factor of deteriorating display quality. For this problem, in this embodiment, as shown in FIG. 5, a top plate larger than the opening of the backlight chassis 21 is provided at the drawer side end of the lamp support frame 16, and this top plate is used as the light leakage prevention portion 18a. It functions to prevent light leakage and foreign material from entering at the same time. The material of the backlight chassis 21 and the lamp support frame 16 is not particularly limited. However, it is necessary to form at least a material that does not transmit light from the viewpoint of preventing light leakage, and the surface is white or silver with good light reflectivity. It is preferable to form with the material of.
6 is a view showing a state in which the lamp set 5 is pulled out from the state shown in FIG. 5 with the light leakage prevention portion 18a of the lamp support frame 16, and as shown in FIG. Only the lamp set 5 can be easily taken out with 20 left on the backlight chassis 21 side.
Here, the lamp 10 and the power supply circuit unit (inverter board 12, return board 13 and return cable 14) form the lamp set 5 because each lamp 10 is connected to the inverter board 12 and the return board 13 by a connector. In particular, in the case of a double-sided backlight structure, since there are illumination surfaces on the front and back, it is difficult to remove the connector of the lamp 10 and the board without disassembling the backlight unit 3. By removing the lamp set 5 from the light unit 3 and then removing the power supply circuit section from the lamp set 5, the power supply circuit section can be easily recycled. As a result, only the lamp 10 and the lamp support frame 16 (the lamp support frame 16 is normally completely fixed to the lamp 10 and cannot be reused) are discarded when the lamp 10 is replaced. Lamp replacement can be realized with labor and cost.
Further, when the lamp set 5 is pulled out, the diffusion plate 19 and the optical sheet 20 remain on the backlight chassis 21 side, and the optical sheet 20 and the liquid crystal panel 6 are not separated, so that the entire backlight unit 3 is removed. As described above, it is possible to avoid the problem that the display quality deteriorates due to the exposure of the backlight light incident surface of the liquid crystal panel 6 and the adhering of foreign matters when the lamp is replaced. In the case of the structure of the present embodiment, the diffusion plate 19 is exposed when the lamp set 5 is pulled out. However, even if some foreign matter adheres to the lamp 10 side of the diffusion plate 19, the diffusion plate 19 and the optical sheet 20 are exposed. As a result, the shadow of the foreign matter is hardly visible and the display quality does not deteriorate as in the case where the foreign matter adheres to the liquid crystal panel 6.
Next, a backlight unit, a liquid crystal display device, and a lamp replacement method according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a perspective view showing the configuration of the backlight unit according to the second embodiment, and FIG. 9 is an exploded perspective view of the backlight chassis. 10 to 13 are sectional views showing the structure of the backlight unit, and FIGS. 14 to 22 are sectional views showing variations of the connection structure between the backlight chassis and the lamp holding frame. FIG. 23 is a cross-sectional view showing how the backlight chassis is deformed.
As shown in FIG. 8, the backlight unit 3 includes a lamp set 5 including a lamp 10, an inverter circuit 12, a return circuit 13, a power supply circuit unit such as a return cable 14 that connects them, and a lamp support frame 16, and a diffusion unit. The backlight chassis 21 holds optical members such as the plate 19 and the optical sheet 20, and in this embodiment, the backlight chassis 21 is composed of a plurality of chassis.
That is, in the first embodiment, the left and right backlight chassis 21 are used, but in this embodiment, the backlight chassis 21 is placed on the four sides of the diffusion plate 19 and the optical sheet 20 as shown in FIG. A chassis (T) 23 on the drawer side (top side) of the lamp set 5, a chassis (B) 22 on the opposite side (bottom side), and two chassis (two on each of the left and right sides) LR) 24, a total of 6 chassis. Then, as shown in FIG. 10 (DD cross section in FIG. 8), a diffusion plate support recess 25 for supporting the diffusion plate 19 and the optical sheet 20 is provided on the inner side surface of each chassis. By supporting the plate 19 and the optical sheet 20, a hollow substantially box shape having an opening on one side is formed, and the lamp 10 and the power supply circuit portion are supported by the lamp support frame 16 in the hollow portion. Set 5 is inserted.
Here, in the configuration in which the left and right backlight chassis 21 are opposed to each other as in the first embodiment, the diffusion plate is supported so that the diffusion plate 19 and the optical sheet 20 (particularly the thick diffusion plate 19) can be attached. Although the shape of the concave portion 25 and the depth and width of the concave portion are limited, in the case of the structure of the present embodiment, each chassis can be combined from the four sides of the diffusion plate 19 and the optical sheet 20, so that the diffusion plate support The depth and width of the recess 25 can be formed in accordance with the diffusion plate 19 and the optical sheet 20, and the diffusion plate 19 and the optical sheet 20 can be held more reliably.
Further, in the configuration in which the left and right backlight chassis 21 are opposed to each other, the left and right chassis are separated, so that sufficient strength against twisting may not be obtained, but the chassis (B) as in this embodiment. The structure in which the 22 and the chassis (T) 23 are integrally formed has an effect that the strength can be improved. In addition, although the figure has shown the structure which divides | segments the backlight chassis 21 into six chassis, the number of division | segmentation, the shape of each chassis, a structure, etc. are arbitrary, the shape of a backlight unit 3, a structure, assembly property, etc. For example, two chassis (LR) positioned on the left and right can be integrally formed.
Further, in the first embodiment, a light leakage prevention portion 18 a is provided at the drawer side end (upper part) of the lamp support frame 16, and light leakage or foreign matter from the gap between the lamp support frame 16 and the upper part of the backlight chassis 21 is provided. However, in this embodiment, measures are taken to prevent light leakage to the side portions of the lamp support frame 16 and the backlight chassis 21 and foreign matter from entering the side portions. Specifically, in the first embodiment, the substrate mounting portion 17 provided at the end of the lamp support frame 16 extends straight in the longitudinal direction of the lamp. However, in this embodiment, as shown in FIG. The board mounting portion 17 of the frame 16 is formed to be bent along the inner surface of the backlight chassis 21, and the side facing the board mounting portion 17 (upper side in FIG. 11) is also the inner surface of the backlight chassis 21. It forms so that. By adopting such a structure, light leaking from the lamp 10 toward the side of the backlight chassis 21 is blocked to prevent a decrease in luminance or uneven luminance, and also prevents foreign substances from entering from the backlight chassis 21. can do. In the first embodiment, since the lamp set 5 can move in the longitudinal direction of the lamp 10 with respect to the backlight chassis 21, there is a possibility that the position of the lamp 10 is shifted and the illumination of the liquid crystal panel 6 is biased. However, in this embodiment, since the lamp set 5 is positioned with respect to the backlight chassis 21 by the light leakage prevention portion 18b provided on the side of the lamp support frame 16, the displacement of the lamp 10 in the longitudinal direction is prevented. Can do. Furthermore, since the light leakage prevention part 18b also serves as a rail when the lamp set 5 is inserted and removed, an effect of facilitating replacement work of the lamp set 5 can be obtained.
In the case of the structure of the present embodiment, since replacement by the lamp set 5 is possible, members around the lamp set 5 have a substantially hollow box shape with one surface opened and are easily deformed. In particular, when the screen size is increased as in recent years, the deformation becomes remarkable. As shown in FIG. 23, the backlight chassis 21 spreads outside the lamp set 5 due to external force, vibration, member distortion, etc. May be enlarged, preventing light leakage and foreign matter intrusion. Further, when the backlight unit is transported, the members vibrate and collide with each other, so that the lamp 10 is easily cracked.
In order to prevent such a problem, a configuration in which the fitting portion 26 is provided in the lamp support frame 16 and the backlight chassis 21 may be employed. For example, as shown in FIGS. 12 and 13, the light leakage prevention part 18 b of the lamp support frame 16 is provided with a convex part protruding in the direction of the lamp 10, while the convex part is provided at a corresponding position of the backlight chassis 21. A recess to be fitted is provided. With such a structure, since the lamp support frame 16 and the backlight chassis 21 are integrated, the rigidity can be improved. Thereby, generation | occurrence | production of a clearance gap can be prevented and light leakage and foreign material penetration | invasion can be prevented reliably.
As a variation of this fitting structure, a structure as shown in FIGS. 14 to 22 is also possible. For example, FIG. 14 shows a structure in which the fitting portion 26 is provided on the lamp support frame 16 on the diffusion plate 19 side. In this structure, the movement of the backlight chassis 21 to open outward (the liquid crystal panel 6 side) cannot be suppressed. However, the displacement of the lamp 10 in the longitudinal direction can be reliably prevented, and the effect of preventing light leakage and entry of foreign matter can be obtained by the convex portion. FIG. 15 shows a structure in which the convex portion of the fitting portion 26 is provided on the backlight chassis 21 side, the concave portion is provided on the lamp support frame 16 side, and the shape of the convex portion is rounded. As a result, it is possible to prevent the longitudinal displacement of the lamp 10, light leakage, and entry of foreign matter.
FIGS. 16 and 17 show a structure in which the contact surfaces of the backlight chassis 21 and the lamp support frame 16 are formed in a stepped shape, and this structure also suppresses the movement of the backlight chassis 21 opening outward. However, the lamp 10 is characterized in that it can be easily manufactured because it can prevent displacement of the lamp 10 in the longitudinal direction, light leakage, and intrusion of foreign matter and is easy to process. FIG. 18 shows a rounded shape of the fitting portion 26 shown in FIGS. 12 and 13, and the lamp set 5 is inserted into and removed from the backlight chassis 21 by rounding the fitting portion 26. Can be made smooth.
14 to 17 show a structure that prevents the backlight chassis 21 and the lamp support frame 16 from being displaced in one direction. As shown in FIG. 19, the corners of the staircase shape shown in FIG. By making the angle acute, it is possible to prevent the displacement of the lamp 10 in the longitudinal direction and to suppress the movement of the backlight chassis 21 to the outside (or inside), and to fix the backlight chassis 21 and the lamp support frame 16 more firmly. can do. FIG. 20 shows a structure in which a fitting portion 26 is provided on the lamp 10 side (left side in the figure), and this structure also suppresses the movement of the backlight chassis 21 being pulled in the left direction in the figure. As a result, the movement of the backlight chassis 21 to the outside can also be suppressed. FIGS. 21 and 22 show a modification of the shape of the fitting portion 26 provided on the side portion of the lamp support frame 16 shown in FIG. 14, and the backlight chassis 21 and the lamp can also be formed by using such a structure. The shift in the longitudinal direction of the support frame 16 and the movement of the backlight chassis 21 to the outside (or the inside) can also be suppressed.
In this way, by dividing the backlight chassis 21 and configuring it, the diffusion plate 19 and the optical sheet 20 can be easily and reliably held, and the strength of the backlight chassis 21 can be improved. Further, by providing a light leakage prevention portion 18a at the end of the lamp support frame 16 on the drawer side and providing a light leakage prevention portion 18b and a fitting portion 26 on the side portion, light leakage to the side portion and foreign matter from the side portion are provided. Intrusion can be prevented and deterioration of display quality can be suppressed. Further, by providing the fitting portion 26, the backlight chassis 21 and the lamp support frame 16 can be integrated to improve the rigidity. In addition, it is also possible to apply the structure of the light leakage prevention part 18b and the fitting part 26 of a present Example to the backlight unit of a 1st Example.
Next, a backlight unit, a liquid crystal display device, and a lamp replacement method according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 24 is a perspective view showing a configuration of a lamp set according to the third embodiment, and FIG. 25 is a sectional view thereof. FIG. 26 is a perspective view showing another structure of the lamp set, and FIGS. 27 to 29 are views showing the structure of the connecting portion of the lamp.
In the first and second embodiments, the lamp support frames 16a and 16b having different shapes in which the power supply circuit section such as the lamp 10, the inverter board 12, the return board 13 and the return cable 14 are formed on one side and the board mounting section 17 is formed. However, if the lamp support frames 16a and 16b have different shapes, the manufacturing becomes complicated and the cost of the liquid crystal display device increases. Therefore, as shown in FIGS. 24 and 25, two lamp support frames 16c having the same shape face each other to hold the lamp 10, and the inverter board 12 and the return board 13 are separated from the board mounting portions 17 of the separate lamp support frames 16c. It is also possible to form the lamp set 5 by fixing to the lamp. By adopting such a structure, the types of necessary members can be reduced, and the mold cost of the lamp support frame 16c can be reduced.
It is also possible to form the lamp set 5 with one lamp support frame. For example, as shown in FIG. 26, a board mounting portion for fixing the inverter board 12 and the return board 13 is provided at both ends of the lamp support frame 16d, and a recess is provided at a position corresponding to both ends of the lamp 10, and the recess It is also possible to insert a holding rubber 11 attached to the end of the lamp 10. As a method for fixing the holding rubber 11, as shown in FIGS. 26 and 27, the reflection sheet 27 is stuck and fixed, and as shown in FIG. 29, the holding rubber 11 and the lamp support frame 16d are fitted with unevenness. There is a method of fixing by providing the joint portion 32.
Here, since the holding rubber 11 is usually formed of silicon or the like, the reflection characteristics are poor, and when the holding rubber 11 is inserted into the recess, the area where the holding rubber 11 is exposed is large and the light use efficiency is poor. Become. Therefore, by attaching the reflection sheet 27 to fix the holding rubber 11 and covering the holding rubber 11 with the reflection sheet 27, the light use efficiency can be increased and the luminance can be improved. In this case, for example, as shown in FIG. 29, the holding rubber 11 attached to the lamp 10 is fitted into the recess provided in the lamp support frame 16d, and when the holding rubber 11 is incorporated, the lamp 10 of the holding rubber 11 faces the lamp 10. By forming the inclined surface and the inclined surface of the lamp support frame 16d so as to be aligned on the same plane, the fixing by the reflection sheet 27 can be further ensured. Further, when the lamp set 5 is formed by one lamp support frame 16d, it is necessary to prevent the holding rubber 11 from being caught when the lamp set 5 is inserted into and removed from the backlight unit 3, as shown in FIG. The holding rubber 11 is preferably fixed with a gap so that the holding rubber 11 does not jump out of the lamp support frame 16d. By configuring the lamp set 5 with the single lamp support frame 16d as described above, the types and the number of members can be reduced, and the cost can be further reduced. Further, in this structure, since the inverter board 12, the return board 13, and the lamp 10 can be assembled from one direction, there is an effect that the assembling workability can be improved.
As described above, the backlight unit, the liquid crystal display device, and the lamp replacement method of the present invention have the following effects.
The first effect of the present invention is that the lamp constituting the backlight can be easily replaced.
The reason is that in the liquid crystal display device of the present invention, the backlight unit is a lamp set in which a lamp and a power supply circuit section such as an inverter board, a return board, and a return cable are fixed by a lamp support frame, a diffusion plate, an optical sheet, This is because it is divided into a backlight chassis to which the optical member is fixed and only the lamp set can be inserted and removed, so that it is not necessary to disassemble the liquid crystal display device or the backlight unit when replacing the lamp.
The second effect of the present invention is that the cost required for lamp replacement can be reduced.
The reason for this is that in the case of a structure in which the entire backlight unit is replaced, optical members such as a diffusion plate and an optical sheet other than the lamp and the housing must be discarded. This is because only the circuit portion and the lamp support frame are provided, and the optical member and the housing can be used as they are. Further, since the lamp set is formed so that the inverter board and the return board can be easily removed, these boards can be taken out and reused after the lamp set is pulled out. Furthermore, it is possible to reduce the costs associated with replacement by combining the lamp support frame with parts having the same shape or by using a single part.
The third effect of the present invention is that it is possible to suppress a problem that foreign matter such as dust enters when the lamp is replaced and the display quality of the liquid crystal display device is deteriorated.
The reason for this is that in the case of the method of replacing the entire backlight unit, the liquid crystal panel surface is exposed and foreign matter adheres when the backlight unit is taken out, whereas in the present invention, the diffusion plate or optical sheet is taken out when the lamp set is taken out. This is because the surface of the liquid crystal panel is not exposed. Further, even if foreign matter adheres to the lamp-side surface of the diffusion plate, reflection of the foreign matter due to light being diffused by the diffusion plate or the optical sheet is suppressed.
The fourth effect of the present invention is that the replacement parts can be easily transported and handled.
The reason is that the lamp set is smaller and lighter and has higher strength than the backlight unit.
In addition, the fifth effect of the present invention can prevent light leakage from the gap between the backlight chassis and the lamp set, intrusion of foreign matter, and displacement, and can smoothly insert and remove the lamp set. That's what it means.
The reason is that a light leakage prevention part that covers the opening of the backlight chassis is provided on the upper surface of the lamp support frame, and a light leakage prevention part that covers the gap with the backlight chassis is provided on the side surface. This is because displacement can be prevented by providing a fitting portion on the contact surface of the lamp support frame. In addition, the light leakage prevention part and the fitting part can improve the strength of the backlight unit, and the lamp set can be easily inserted and removed.
FIG. 1 is a cross-sectional view showing a structure of a double-sided liquid crystal display device including a backlight unit according to a first embodiment of the present invention.
FIG. 2 is a perspective view showing a structure of a backlight unit according to the first embodiment of the present invention.
FIG. 3 is an exploded perspective view of the backlight unit according to the first embodiment of the present invention for each component.
FIG. 4 is a cross-sectional view showing the structure of the backlight unit according to the first embodiment of the present invention (cross section AA in FIG. 2).
FIG. 5 is a cross-sectional view showing the structure of the backlight unit according to the first embodiment of the present invention (cross section BB in FIG. 2).
FIG. 6 is a cross-sectional view showing the structure of the backlight unit according to the first embodiment of the present invention, and shows a state in which the lamp set is taken out from the backlight chassis.
FIG. 7 is a cross-sectional view showing light leakage from a gap between a backlight chassis and a lamp support frame.
FIG. 8 is a perspective view showing a structure of a backlight unit according to a second embodiment of the present invention.
FIG. 9 is a perspective view showing a structure of a backlight unit according to a second embodiment of the present invention, and shows a state where a backlight chassis is disassembled.
FIG. 10 is a cross-sectional view showing a structure of a backlight unit (DD cross section of FIG. 8) according to a second embodiment of the present invention.
FIG. 11 is a cross-sectional view showing a structure of a backlight unit (light leakage prevention unit) according to a second embodiment of the present invention.
FIG. 12 is a cross-sectional view showing the structure of a backlight unit (fitting portion) according to a second embodiment of the present invention.
FIG. 13 is a cross-sectional view showing a structure of a backlight unit (fitting portion) according to a second embodiment of the present invention.
FIG. 14 is a cross-sectional view showing a variation of the fitting portion according to the second embodiment of the present invention.
FIG. 15 is a cross-sectional view showing a variation of the fitting portion according to the second embodiment of the present invention.
FIG. 16 is a cross-sectional view showing a variation of the fitting portion according to the second embodiment of the present invention.
FIG. 17 is a cross-sectional view showing a variation of the fitting portion according to the second embodiment of the present invention.
FIG. 18 is a cross-sectional view showing a variation of the fitting portion according to the second embodiment of the present invention.
FIG. 19 is a cross-sectional view showing a variation of the fitting portion according to the second embodiment of the present invention.
FIG. 20 is a cross-sectional view showing a variation of the fitting portion according to the second embodiment of the present invention.
FIG. 21 is a cross-sectional view showing a variation of the fitting portion according to the second embodiment of the present invention.
FIG. 22 is a cross-sectional view showing a variation of the fitting portion according to the second embodiment of the present invention.
FIG. 23 is a cross-sectional view showing how the backlight chassis is deformed.
FIG. 24 is a perspective view showing the structure of a lamp set according to a third embodiment of the present invention.
FIG. 25 is a cross-sectional view showing the structure of a lamp set according to a third embodiment of the present invention.
FIG. 26 is a perspective view showing another structure of the lamp set according to the third embodiment of the present invention.
FIG. 27 is an enlarged perspective view of a lamp connecting portion of a lamp set according to a third embodiment of the present invention.
FIG. 28 is an enlarged sectional view of a lamp connecting portion of a lamp set according to a third embodiment of the present invention.
FIG. 29 is an enlarged cross-sectional view of a lamp connecting portion of a lamp set according to a third embodiment of the present invention.
FIG. 30 is a perspective view showing a structure of a conventional liquid crystal display device.
FIG. 31 is an exploded view showing a structure of a conventional liquid crystal display device.
FIG. 32 is a cross-sectional view showing the structure of a conventional backlight unit.
FIG. 33 is an exploded view showing the structure of a conventional double-sided liquid crystal display device.
FIG. 34 is an exploded view showing a structure of a backlight unit of a conventional double-sided liquid crystal display device.
FIG. 35 is a cross-sectional view showing the structure of a backlight unit of a conventional double-sided liquid crystal display device.
1a Double-sided liquid crystal display device
3a Double-sided backlight unit
4, 4a, 4b Housing (shield front)
5 Lamp set
6, 6a, 6b LCD panel
7, 7a, 7b Substrate
8, 8a, 8b TCP
11 Holding rubber
12 Inverter board
13 Return board
14 Return cable
16, 16a-16d Lamp support frame
17 Board mounting part
18a, 18b Light leakage prevention part
19, 19a, 19b Diffuser
20, 20a, 20b Optical sheet
21, 21a, 21b Backlight chassis
22 Chassis (B)
23 Chassis (T)
24 Chassis (LR)
25 Diffuser support recess
26, 32 Fitting part
27 Reflective sheet
28 Lamp support
29, 31 Reflector
In a backlight unit including a plurality of rod-shaped lamps arranged at predetermined intervals, a circuit board that supplies power to the lamps, an optical member that makes light from the lamps substantially uniform illumination light, and a housing ,
An exchange unit in which at least the lamp and the circuit board are supported by a frame-shaped support means, and at least the housing for holding the optical member are formed separately,
The replacement unit is held in the housing so that it can be pulled out .
The frame-shaped support means includes a frame portion that supports both end portions of the lamp at two opposing sides, and a substrate mounting portion that is provided outside the frame portion and supports the circuit board.
Two frame-shaped support means having the same shape,
And one of the frame-like supporting means, in a state facing the other of the frame-like support means were everted, a backlight unit, wherein Rukoto side end portion is supported by being sandwiched in the lamp.
The replacement unit is provided with first light shielding means for covering at least the opening of the housing serving as the outlet of the replacement unit when viewed from the pulling direction of the replacement unit and preventing leakage of light from the lamp. The backlight unit according to claim 1.
3. The backlight unit according to claim 2, wherein the first light shielding unit includes a top plate that engages with a periphery of the opening in a state where the replacement unit is stored in the housing .
The frame-like support means and the housing include a guide portion that slidably abuts the frame portion of the frame-like support means and the inner surface of the housing;
The replacement unit has at least a gap between the frame portion and the housing in the guide portion as viewed from a direction orthogonal to the pull-out direction of the replacement unit and parallel to a plane formed by the frame portion. cover, a back light unit according to any one of claims 1 to 3, characterized in that it comprises a second light shielding means for preventing light leakage of the lamp.
The housing is formed such that a region for storing the substrate mounting portion of the frame-shaped support means is wider than the guide portion,
The second light-shielding means is formed by the end of the frame portion on the side of the substrate mounting portion or the substrate mounting portion extending so as to contact the surface of the guide portion on the region side where the substrate mounting portion is stored. The backlight unit according to claim 4 , wherein the backlight unit is provided.
The backlight unit according to claim 4 or 5, characterized in that it comprises the frame portion and the to the housing, the fitting portion capable of sliding in a state of being engaged with each other of the frame-like supporting means.
Wherein the housing, the formed by dividing in correspondence to the respective sides of the optical member, any one of claims 1 to 4, characterized in that a recess for holding the optical member to the housing of each The backlight unit described in.
8. A double-sided liquid crystal display device , wherein a liquid crystal panel is disposed on the front and back surfaces of the backlight unit according to claim 1, and a display surface is formed on both the front and back surfaces .
JP2003140226A 2003-05-19 2003-05-19 Backlight unit, liquid crystal display device, and lamp replacement method Active JP4282371B2 (en)
JP2003140226A JP4282371B2 (en) 2003-05-19 2003-05-19 Backlight unit, liquid crystal display device, and lamp replacement method
TW093113952A TWI294056B (en) 2003-05-19 2004-05-18 Display device
KR1020040035094A KR100689356B1 (en) 2003-05-19 2004-05-18 Backlight units with quick installation and removal of light emitting structures
CNB2004100472047A CN1322363C (en) 2003-05-19 2004-05-19 Back light unit capable of rapid mounting and dismounting luminous device
US10/849,285 US7940347B2 (en) 2003-05-19 2004-05-19 Backlight units with quick installation and removal of light emitting structures
JP2004342550A JP2004342550A (en) 2004-12-02
JP4282371B2 true JP4282371B2 (en) 2009-06-17
ID=33447385
JP2003140226A Active JP4282371B2 (en) 2003-05-19 2003-05-19 Backlight unit, liquid crystal display device, and lamp replacement method
US (1) US7940347B2 (en)
JP (1) JP4282371B2 (en)
KR (1) KR100689356B1 (en)
CN (1) CN1322363C (en)
TW (1) TWI294056B (en)
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2004-05-18 KR KR1020040035094A patent/KR100689356B1/en active IP Right Grant
2004-05-18 TW TW093113952A patent/TWI294056B/en active
2004-05-19 CN CNB2004100472047A patent/CN1322363C/en active IP Right Grant
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KR20040100951A (en) 2004-12-02
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