JP4557998B2 - Lamp holding member and backlight device - Google Patents

Description

  The present invention relates to a lamp holding member and a backlight device, and more particularly, to a lamp holding member for holding a plurality of fluorescent lamps driven by an inverter circuit, and a backlight device including the lamp holding member.

  Backlights used in liquid crystal televisions and the like are becoming larger with the increase in the screen size of liquid crystal televisions. In addition, demands for lower power consumption, lower prices, and the like are becoming stronger for backlights. To meet these demands, U-shaped and U-shaped curved tube fluorescent lamps are used in place of conventional straight tube fluorescent lamps to reduce the number of fluorescent lamp tubes and the number of inverters. The configuration that can reduce the amount is applied.

  Recently, there is a U-shaped fluorescent lamp (lamp unit) obtained by unitizing two straight tube fluorescent lamps by connecting them through lead wires. Since this lamp unit is composed of two straight tube fluorescent lamps connected, it is known that the lamp unit is easier to produce than the conventional curved tube fluorescent lamp, and the workability when the fluorescent lamp is mounted is good.

  When the lamp unit having the above configuration is applied to a direct type backlight device, a plurality of fluorescent lamps are connected at equal intervals through lead wires. In this case, it was possible to process the lamp harness using the backlight holding device described in Patent Document 1 or the like.

On the other hand, in order to realize further cost reduction and power saving, the interval between fluorescent lamps may be increased to reduce the number of lamps. In order to prevent such a decrease in the brightness of the liquid crystal television caused by the reduction in the number of lamps, the place where people can see is increased by increasing the brightness by narrowing the lamp pitch (that is, the interval in the fluorescent tube array direction). In difficult places, the lamp pitch can be widened to lower the brightness. At this time, the interval between the fluorescent lamps is not uniform with respect to the lamp arrangement direction (array direction).
JP 11-146304 A

  However, in the case of the configuration as described above, since the plurality of lamp units are made of common parts, the lead wires are designed to have the same length. When this lamp unit is housed in the backlight chassis, the extra length of the lead wire cannot be absorbed in a place where the lamp pitch is narrow, and it becomes easy to loosen.

  If the lamp holder holding the fluorescent lamp is inserted into the backlight chassis in this state, the loose lead wire is sandwiched between the lamp holder and the backlight chassis, which may cause disconnection or wire biting. For this reason, there is a possibility that the backlight cannot be turned on normally.

  The present invention has been made in view of the circumstances as described above, and appropriately handles the slack of the lead wire that occurs when the interval between the plurality of fluorescent tubes connected via the lead wire is made non-uniform, It is an object of the present invention to provide a lamp holding member that can prevent disconnection of a lead wire, wire biting, and the like, and a backlight device including the lamp holding member.

  In order to solve the above-mentioned problem, a first technical means of the present invention is a lamp holding member for holding a plurality of lamp units in which a plurality of fluorescent tubes are connected via lead wires, A plurality of lead wire storage units for storing wires are provided in the fluorescent tube arrangement direction, and a plurality of lead wire storage units are formed with protrusions for engaging the lead wires to prevent loosening of the lead wires, constituting a lamp unit The lengths and / or widths of the protrusions differ according to the interval in the arrangement direction of the plurality of fluorescent tubes.

  The second technical means is the first technical means, wherein the interval corresponding to the vicinity of the center of the screen of the display panel illuminated by the lamp unit is shortened, and the interval corresponding to the vicinity of the upper and lower ends of the screen of the display panel is increased. It is characterized by that.

  The third technical means is characterized in that, in the second technical means, the length of the protrusion is shortened when the interval is long, and the length of the protrusion is increased when the interval is short.

  According to a fourth technical means, in the second technical means, when the interval is long, the width of the protrusion is increased, and when the interval is short, the width of the protrusion is reduced.

  According to a fifth technical means, in the second technical means, when the interval is long, the length of the projection is shortened and the width is lengthened. When the interval is short, the length of the projection is lengthened and the width is shortened. It is characterized by.

  A sixth technical means includes a pair of upper and lower lamp holders for holding and fixing the lamp unit and its lead wire in any one of the first to fifth technical means, and a plurality of technical means are provided below the lamp holder. A lead wire storage portion is formed.

  A seventh technical means includes the lamp holding member according to any one of the first to sixth technical means, a lamp unit held by the lamp holding member, and a housing for mounting the lamp holding member. This is a backlight device.

  According to the present invention, by appropriately treating the slack of the lead wire that occurs when the interval between the plurality of fluorescent tubes connected via the lead wire is made non-uniform, it is possible to prevent disconnection of the lead wire, wire biting, etc. Can be prevented.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a lamp holding member and a backlight device including the lamp holding member according to the invention will be described with reference to the accompanying drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof will be omitted.

  FIG. 1 is a cross-sectional view showing a configuration example of a liquid crystal display device using a backlight device according to the present invention. In the figure, the liquid crystal display device includes a liquid crystal panel 1 and a backlight device 2 as main components. The liquid crystal panel 1 supplies the video signal subjected to the video signal processing as a predetermined gradation voltage for each pixel in accordance with the clock signal of the liquid crystal panel 1, and performs video display processing by sequential scanning on the screen, thereby converting the video signal to the video signal. Display the corresponding video. The backlight device 2 emits light from the opposite side of the display surface of the liquid crystal panel 1. As the light source of the backlight device 2, for example, a fluorescent tube such as a cold cathode fluorescent lamp (CCFL) is used.

  The backlight device 2 includes a plurality of fluorescent tubes 21 for supplying light to the liquid crystal panel 1 and a reflection sheet or a reflection plate (hereinafter referred to as “effectively irradiating light emitted from each fluorescent tube 21 to the liquid crystal panel 1 side”). , Which is represented by a reflection sheet) 22 and a housing (chassis) 23 for storing them. An inverter circuit board 28 (inverter circuit 28) for mounting an inverter circuit is disposed on the back surface of the housing 23 (that is, the surface opposite to the installation surface of the fluorescent tube 21). The inverter circuit 28 is provided with components such as an inverter transformer 29 as a booster circuit for supplying power to each fluorescent tube 21. As the inverter transformer 29, for example, there is a winding type that transforms based on the winding ratio of the coils by the electromagnetic induction effect of two coils.

  As the inverter circuit 28, for example, a separately excited inverter can be applied. In general, a separately excited inverter is provided with an oscillation circuit on the primary side and converts it into an alternating current having the same frequency as the drive frequency of the oscillation circuit. This separately excited inverter is used for driving the winding-type inverter transformer 29 as described above. By doing so, it is possible to realize a small-sized and highly efficient inverter that exceeds the piezoelectric inverter while being a winding type.

  The liquid crystal panel 1 is composed of two glass substrates with polarizing plates having a crossed Nicols relationship with a liquid crystal layer interposed therebetween, and the liquid crystal panel 1 is fixedly held by two frames 3 and 4 in the thickness direction. The frames 3 and 4 have a structure bent into a substantially L-shaped cross section so as to cover the entire backlight device 2.

  The fluorescent tubes 21 constituting the backlight device 2 have a linear shape and are arranged so that the linear portions are parallel to each other. Moreover, the shape of the reflection sheet 22 may be, for example, a planar shape as shown in FIG.

  Furthermore, various optical members may be provided according to the optical performance required for the liquid crystal display device. For example, as shown in FIG. 1, with respect to a light source composed of a plurality of fluorescent tubes 21, a diffusion plate 24 for reducing the luminance difference between the arrangement position of the fluorescent tube 21 and other positions, and a request A diffusion sheet 25 for supplying an optimal light distribution characteristic to the usage pattern to be used, a prism sheet 26 for condensing light in a specific direction, and selectively transmitting / transmitting the polarization of light in a specific direction The reflection polarizing plate 27 is used to improve the degree of polarization of light that is reflected and incident on the liquid crystal panel 1. These various optical members (diffusing plate 24, diffusing sheet 25, prism sheet 26, reflective polarizing plate 27, etc.) are formed in a plate shape or a sheet shape, and are arranged between the fluorescent tube 21 and the liquid crystal panel 1. .

  The fluorescent tube 21 excites mercury in the fluorescent tube 21 by a high-voltage alternating voltage supplied to an electrode from an inverter transformer 29 of an inverter circuit 28 disposed substantially parallel to the back surface of the backlight device 2, and its energy level. By this ultraviolet light, phosphors of the three colors red, blue, and green of the fluorescent tube 21 emit light, and white light is supplied by mixing these emitted colors. The white light thus emitted has its light distribution characteristics controlled by the various optical members described above, and can effectively supply light to the liquid crystal panel 1. By supplying light from the backlight device 2, the brightness of each pixel is controlled by the light transmittance corresponding to a predetermined gradation voltage in each pixel of the liquid crystal panel 1, and an image is displayed on the screen.

  FIG. 2 is a diagram for explaining an example of the arrangement and driving method of the fluorescent lamp of the backlight device. FIG. 2A is a diagram for explaining an arrangement of the fluorescent lamp and an example of the connection configuration of the inverter transformer. B) is a diagram illustrating a driving method of the fluorescent lamp at this time. In the figure, 30 is a connecting member installed on the inverter circuit board, 100 is a pseudo U-shaped tube composed of two fluorescent lamps 21, 101a and 101b are electrodes of the fluorescent lamp 21, and 102 is connected to the electrode 101a. 103, a socket, and 104, a lead wire for interconnecting the electrodes 101b.

  The backlight of the present embodiment employs a pseudo U-tube configuration (corresponding to the lamp unit of the present invention) in which the electrodes on one side of each of the two straight tube fluorescent lamps 21 are connected by lead wires. By using the pseudo U-shaped tube structure, it is easier to handle than the conventional U-shaped tube, and the advantage that the backlight can be easily assembled can be obtained. Further, unlike the U-shaped tube, the configuration using the pseudo U-shaped tube has an advantage that it can easily cope with the change in use of the pitch of the fluorescent lamp. The pseudo U-shaped tube can be lit with the same number of inverters as the conventional U-shaped tube.

  Furthermore, in the present embodiment, it occurs when the intervals in the arrangement direction of the fluorescent tubes constituting the lamp unit are made non-uniform by setting a plurality of pseudo U-shaped lamp units on the lamp holding member of the present invention. Since the looseness of the lead wire can be appropriately treated, it is possible to prevent the lead wire from being disconnected or caught. A specific example of such a lamp holding member will be described later.

  In FIG. 2, the interval of the pseudo U-shaped tube 100 corresponding to the vicinity of the center of the screen of the liquid crystal panel illuminated by the pseudo U-shaped tube 100 is shortened, and the interval of the pseudo U-shaped tube 100 corresponding to the vicinity of the upper and lower ends of the screen of the liquid crystal panel. And the interval is not uniform with respect to the fluorescent tube arrangement direction. This is because when the interval between the pseudo U-tubes is increased and the number of fluorescent tubes is reduced, the place where the human eye can see (that is, near the center of the screen) is the lamp pitch in order to prevent the decrease in luminance caused by the reduction in the number of fluorescent tubes. This is because the lamp pitch is widened in a place that is difficult to be seen by human eyes (that is, near the upper and lower ends of the screen).

A plurality of pseudo U-shaped tubes 100 are arranged in parallel. In each pseudo U-shaped tube 100, the electrodes 101 b on one side of the two straight tube fluorescent lamps 21 are connected by lead wires 104. The other electrode 101 a of each fluorescent lamp 21 is connected to the socket 103 via the lead wire 102. The socket 103 is connected to the connection member 30 of the inverter circuit board 28.
A pair of inverter circuit boards 28 are provided on the left and right sides, and are arranged near the electrodes at both ends of the fluorescent lamp 21 on the back side of the housing 23.

  In this example, the high-voltage AC voltage is supplied from the inverter transformer 29 on the inverter circuit board 28 to the electrode 101 a of one of the fluorescent lamps 21 among the electrodes 101 a on the driving side of the two fluorescent lamps 21. In addition, among the driving-side electrodes 101a, the electrode 101a of the other fluorescent lamp 21 is grounded. Accordingly, the pseudo U-shaped tube 100 is driven by one side by the single inverter transformer 29 and lights up.

The plurality of pseudo U-tubes 100 are arranged such that the electrodes 101a and 101b are alternately arranged. That is, in the backlight device in which a plurality of pseudo U-shaped tubes are arranged, the adjacent pseudo U-shaped tubes are arranged so that the directions of the electrodes connecting the socket 103 are different.
As a result, the electrodes 101a connected to the inverter transformer are alternately arranged on the left and right sides for each pseudo U-shaped tube, and luminance unevenness generated in the tube axis direction between the high-voltage side and the ground side is compensated, and the backlight As a result, luminance unevenness can be reduced.

  FIG. 3 is a diagram for explaining another example of the arrangement and driving method of the fluorescent lamp of the backlight device, and FIG. 3A is a diagram for explaining the arrangement of the fluorescent lamp and the connection configuration example of the inverter transformer. FIG. 3B is a diagram for explaining the driving method of the fluorescent lamp at this time.

The configuration of FIG. 3 is such that the pseudo U-tube 100 is driven on both sides by two inverter transformers, and the other configurations are the same as those of FIG.
That is, in this example, the inverter transformer 29 is connected to both of the driving-side electrodes 101a of the two fluorescent lamps 21, and a high-voltage AC voltage whose phases are inverted from each other is supplied to both the electrodes 101a. As a result, the pseudo U-shaped tube 100 is driven on both sides by the two inverter transformers 29 and lights up.

  FIG. 4 is a diagram for explaining another example of the arrangement and driving method of the fluorescent lamp of the backlight device, and FIG. 4A is a diagram for explaining an example of the arrangement of the fluorescent lamp and the connection configuration of the inverter transformer. FIG. 4B is a diagram for explaining the driving method of the fluorescent lamp at this time.

The configuration of FIG. 4 is such that the pseudo U-tube 100 is driven on both sides by one inverter transformer, and the other configurations are the same as those of FIG.
That is, in this example, one inverter transformer 29 is connected to both electrodes 101a on the driving side of the two fluorescent lamps 21, and a high-voltage AC voltage whose phases are inverted from each other is supplied to both electrodes 101a. As a result, the pseudo U-shaped tube 100 is driven on both sides by one inverter transformer 29 and lit.

  FIG. 5 is a view showing a configuration example of a lamp holding member according to the present invention, and the lamp holding member is configured to include a pair of upper and lower lamp holders at both ends of the fluorescent lamp 21. Here, in order to simplify the description, the lead wire side and the drive side of the pseudo U-tube 100 are gathered and arranged on one side, and an example of the lamp holding member on the lead wire side at this time is shown. . Needless to say, as shown in FIGS. 2 to 4 described above, the lead wire side and the drive side of the pseudo U-shaped tube 100 may be alternately arranged.

  In FIG. 5A, the pair of upper and lower lamp holders includes a lamp holder lower part 200 and a lamp holder upper part 300. FIG. 5B is an enlarged view of a portion X in FIG. In the lamp holder lower part 200, a plurality of lead wire storage portions 201 to 203 for storing the lead wires 104 of the pseudo U-tube 100 are formed in the fluorescent tube arrangement direction. The lamp holder upper portion 300 is formed with a plurality of lamp fixing portions 301 to 303 provided corresponding to the mounting positions of the pseudo U-shaped tube 100. The lamp fixing portions 301 to 303 are semicircular cuts that are about several mm larger than the lamp cross section in order to fix the fluorescent lamp 21 and the lead wire 104, and correspond to the mounting position of the pseudo U-shaped tube 100. It is formed in the fluorescent tube array direction.

  The plurality of lead wire storage portions 201 to 203 are formed with projections 204 to 206 for engaging the lead wire 104 to prevent the lead wire 104 from being loosened, and the arrangement of the fluorescent lamps 21 constituting the pseudo U-shaped tube 100 The lengths and / or widths of the protrusions differ depending on the direction interval (corresponding to the interval 1 shown in FIG. 6A described later).

  As described above, the plurality of pseudo U-shaped tubes 100 shortens the interval l corresponding to the vicinity of the center of the screen of the liquid crystal panel illuminated by the pseudo U-shaped tube 100, and corresponds to the vicinity of the upper and lower ends of the screen of the liquid crystal panel. The tube 100 is attached with a long interval l and a non-uniform interval l with respect to the fluorescent tube arrangement direction. Here, since the length of the lead wire 104 of the pseudo U-shaped tube 100 is constant, when the intervals l of the pseudo U-shaped tube 100 are arranged non-uniformly, the lead wire 104 is near the center of the screen where the distance l becomes shorter. Loosens, leading to disconnection of the lead wire 104 and biting of the wire.

  Therefore, as shown in FIG. 5B, the protrusion 206 of the lead wire storage portion 203 corresponding to the vicinity of the center of the screen of the liquid crystal panel has a long length n, a short width m, and a screen edge direction (arrow in the figure). The length n of the protrusion 205 and the protrusion 204 is short and the width m is long. With such a configuration, in the case of the lead wire storage unit 203 located near the center of the screen, the slack of the lead wire 104 that occurs due to the short interval l between the pseudo U-tubes 100 can be absorbed by the protrusions 206. .

  In the above example, both the projection length n and the width m are changed according to the interval l of the pseudo U-tube 100, but only one of the projection length n and the width m is changed. You may do it. For example, when the interval l of the pseudo U-shaped tube 100 is long, the length n of the projection is shortened, and when the interval l of the pseudo U-shaped tube 100 is short, the length n of the projection is increased. Further, when the interval l of the pseudo U-shaped tube 100 is long, the width m of the protrusion may be increased, and when the interval l of the pseudo U-shaped tube 100 is short, the width m of the protrusion may be decreased.

  As described above, since the looseness of the lead wire 104 that occurs when the interval l in the arrangement direction of the fluorescent lamps 21 constituting the pseudo U-tube 100 is made uneven can be appropriately processed, the lead wire 104 is broken or bitten. Can be prevented.

  FIG. 6 is a view showing a state in which a pseudo U-shaped tube is attached to the lamp holding member according to the present invention. 6A is a diagram illustrating a configuration example of the pseudo U-shaped tube 100, and FIG. 6B is a diagram illustrating a state in which the pseudo U-shaped tube 100 illustrated in FIG. 6A is attached to a lamp holding member. FIG. 7 is an enlarged view of a Y portion in FIG.

  In FIG. 6B, the protrusion 206 of the lead wire storage portion 203 corresponding to the vicinity of the screen center of the liquid crystal panel has a long length n and a short width m, and the protrusion 205 and the protrusion 204 toward the upper and lower ends of the screen. The length n is short and the width m is long. With such a configuration, in the case of the lead wire storage unit 203 located near the center of the screen, the slack of the lead wire 104 that occurs due to the short interval l between the pseudo U-tubes 100 can be absorbed by the protrusions 206. .

  FIG. 7 is an enlarged view of a Y portion shown in FIG. That is, the interval l corresponding to the vicinity of the center of the screen of the liquid crystal panel illuminated by the pseudo U-shaped tube 100 is shortened toward the upper and lower ends of the screen of the liquid crystal panel (in the direction of the arrow in the figure). Even when l is lengthened and the interval l is not uniform with respect to the fluorescent tube arrangement direction, the lead wire 104 of each pseudo U-tube 100 is engaged with the protrusions 204 to 206, and the lead wire 104 is slack. Is absorbed. In the case of this example, the projection 206 of the lead wire storage portion 203 corresponding to the vicinity of the center of the screen of the liquid crystal panel has a long length n and a short width m, and the projection 205 has a length n toward the upper and lower ends of the screen. It is configured to be short and have a long width m.

  FIG. 8 is an external view showing an example of a backlight device including the pseudo U-shaped tube 100 held by the lamp holding member of the present invention. In the backlight device of the present invention, an optical sheet group (diffusion plate 24) is provided in a housing 23 in which a plurality of pseudo U-tubes 100 are held and accommodated by a lamp holding member (including a lamp holder lower part 200 and a lamp holder upper part 300). , A diffusion sheet 25, a prism sheet 26, and a reflective polarizing plate 27) are set, and further, the liquid crystal panel 1 is set.

  As described above, the interval in the fluorescent tube arrangement direction of the pseudo U-shaped tube 100 is narrowed toward the center of the screen of the liquid crystal panel 1, but by using the lamp holding structure shown in FIG. Since the lead wire connecting the fluorescent tubes of the tube 100 is not sandwiched between the lamp holding member and the housing 23, disconnection of the lead wire and biting of the wire can be prevented.

  As described above, according to the present invention, by appropriately treating the slack of the lead wire that occurs when the intervals between the plurality of fluorescent tubes connected via the lead wire are made uneven, Disconnection and biting can be prevented.

It is sectional drawing which shows the structural example of the liquid crystal display device using the backlight apparatus by this invention. It is a figure for demonstrating an example of arrangement | positioning and a drive system of the fluorescent lamp of a backlight apparatus. It is a figure for demonstrating other examples of arrangement | positioning and a drive system of the fluorescent lamp of a backlight apparatus. It is a figure for demonstrating other examples of arrangement | positioning and a drive system of the fluorescent lamp of a backlight apparatus. It is a figure which shows the structural example of the lamp holding member which concerns on this invention. It is a figure which shows the state which attached the pseudo U-tube to the lamp | ramp holding member which concerns on this invention. It is the figure which expanded the Y section of FIG. 6 (B). It is an external view which shows an example of the backlight apparatus provided with the pseudo U-shaped tube hold | maintained by the lamp holding member of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal panel, 2 ... Backlight apparatus, 3, 4 ... Frame, 21 ... Fluorescent tube (fluorescent lamp), 22 ... Reflection sheet, 23 ... Housing | casing, 24 ... Diffusing plate, 25 ... Diffusing sheet, 26 ... Prism sheet , 27 ... reflective polarizing plate, 28 ... inverter circuit board, 29 ... inverter transformer, 30 ... connecting member, 100 ... pseudo U-shaped tube (lamp unit), 101a, 101b ... electrode, 102, 104 ... lead wire, 103 ... socket , 200 ... lower part of the lamp holder, 201 to 203 ... lead wire storage part, 204 to 206 ... projection, 300 ... upper part of the lamp holder, 301 to 303 ... lamp fixing part.

Claims (7)

A lamp holding member that holds a plurality of lamp units in which a plurality of fluorescent tubes are connected via lead wires,
A plurality of lead wire storage portions for storing the lead wires of the lamp unit in the fluorescent tube arrangement direction;
The plurality of lead wire storage portions are formed with protrusions for engaging the lead wires to prevent loosening of the lead wires, and according to intervals in the arrangement direction of the plurality of fluorescent tubes constituting the lamp unit The lamp holding member is characterized in that the protrusions have different lengths and / or widths.   The lamp holding member according to claim 1, wherein the interval corresponding to the vicinity of the center of the screen of the display panel illuminated by the lamp unit is shortened, and the interval corresponding to the vicinity of the upper and lower ends of the display panel is increased. A lamp holding member.   3. The lamp holding member according to claim 2, wherein when the distance is long, the length of the protrusion is shortened, and when the distance is short, the length of the protrusion is lengthened.   3. The lamp holding member according to claim 2, wherein when the interval is long, the width of the protrusion is increased, and when the interval is short, the width of the protrusion is reduced.   3. The lamp holding member according to claim 2, wherein when the distance is long, the length of the protrusion is shortened and the width is lengthened, and when the distance is short, the length of the protrusion is lengthened and the width is shortened. A lamp holding member. The lamp holding member according to any one of claims 1 to 5, comprising a pair of upper and lower lamp holders for holding and fixing the lamp unit and its lead wire.
The lamp holding member, wherein the plurality of lead wire storage portions are formed below the lamp holder.   A lamp holding member according to any one of claims 1 to 6, a lamp unit held by the lamp holding member, and a casing for mounting the lamp holding member. Backlight device.

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