JP2001266631A - Display device and guide light - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device and a guide light allowing a large-sized display board to be used with a relatively simple structure. SOLUTION: The display device comprises a light guide means 1 with a light emitting surface 12 and a light incident surface 11 integrally mounted on one side of a platy body of the light guide means, a device body 5 with a lighting circuit 54 on the inner side of an opening 51, and cold cathode fluorescent lamps 2a, 2b disposed in such a direction that the electric potentials on adjacent sides 60 are both always on the stable electric potential side by the electric connection of a lead wire 9 led out of first and second linear light source holding members 21, 22 and the lighting device 54. Since the cold cathode fluorescent lamps 2a, 2b on the adjacent sides 60 are positioned so as to have equal potentials are for all times, the display device with a large-sized light guide plate can be manufactured easily at a reduced cost without requiring a special insulation treatment, etc., on the adjacent sides 60.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a display device and a guide light.

2. Description of the Related Art A sidelight type backlight is often used in a display device using a backlight typified by a guide light or the like. The sidelight method is one that irradiates the display panel by injecting light from one end surface of a light guide means such as a light guide plate, propagating the incident light to one surface substantially orthogonal to the end surface, and emitting light from this one surface. It is.

[0002] Sidelight type backlights are becoming mainstream because the entire device can be made thinner than an internally illuminated type in which a light source is arranged inside the display panel, and the backlight is becoming larger. The light guide plate also tends to be large.

A large-sized display device using the sidelight type backlight is disclosed, for example, in Japanese Patent Laid-Open No. 1-2616.
No. 92 is known. In this prior art, a plurality of light guide plates are combined so that each linear light source is adjacent to each other in a straight line so that a large display plate can be illuminated. That is, since light does not emit between the adjacent ends of the linear light source, the light exit surface of the light guide plate near the ends has low brightness, but a light distributor is provided on the light incident surface opposed to between the ends. It is provided so as not to cause uneven brightness on the display surface.

However, in the above-mentioned prior art, since a plurality of linear light sources are arranged so as to be linear, the ends of the linear light sources are close to each other, so that both electric sources are electrically connected. If the polarities are different, the potential difference increases when the linear light sources are turned on, so that special insulation treatment must be performed between adjacent linear light sources. Such an insulating process has a problem that the production becomes complicated and the cost increases.

[0004] The present invention has been made in view of the above problems, and has as its object to provide a display device and a guide light that can use a large light guide plate with a relatively simple configuration.

According to a first aspect of the present invention, there is provided a display device having an opening formed therein and a lighting device housed inside the opening; a flat main body; A light guide plate provided on the opening side of the device main body, the light guide plate having a light exit surface provided and a light incident surface provided on an end surface substantially orthogonal to the light exit surface; provided on the light exit surface side of the light guide plate A pair of display plates, which are linearly arranged along the longitudinal direction of the light incident surface and are positioned so that the potentials of the electrodes adjacent to each other become substantially the same during lighting by electrical connection with the lighting device. And a linear light source.

[0005] The device main body only needs to accommodate desired components such as a lighting device such as a high-frequency inverter device for lighting a linear light source, which will be described later, and can support the light guide plate, the linear light source holding member, and the display plate. The shape and material are not particularly limited as long as the structure is possible. In the case where a plurality of light guide plates are provided, it is allowed that an opening is formed for each light emitting surface.

The light guide plate is desirably formed of a synthetic resin such as an acrylic resin or a polycarbonate resin. However, the light guide plate is not particularly limited as long as the light guide plate has a property of transmitting incident light to an emission surface. The shape is desirably a flat plate, but any shape may be used as long as the gist of the present invention is not deviated.

The light guide plate allows the provision of light distribution means so that desired light distribution characteristics can be obtained on the light exit surface.
As the light distribution means, for example, dot printing in which ink containing a light transmission control material (white pigment) is regularly printed on the surface facing the light emitting surface, and a plurality of irregularities are provided on the surface facing the light emitting surface Examples include, but are not limited to, prism cut shape or dot processing, and rough surface processing in which a surface facing the light emitting surface is polished to provide fine irregularities.

The light distribution means is provided in a desired pattern so as to obtain a desired light distribution. The light distribution means is not limited to the surface facing the light exit surface, and may be provided on both sides of the light exit surface of the light guide plate or the surface facing the light exit surface and the light exit surface. When a plurality of light guide plates are used, the same or different light distribution means can be provided for the plurality of light guide plates. The light distribution means may be formed directly on the light guide plate or may be formed separately. Therefore, an optical sheet having a condensing function or a light diffusing function may be provided on the light emitting surface, and in this case, the outer surface of the optical sheet constitutes the light emitting surface. Examples of the optical sheet include a sheet having a light collecting function provided with glass beads or the like, a prism sheet, a light diffusion sheet, a polarizing film, and the like.

[0009] The light guide plate is not limited to the one in which the light incident surface is provided only on one end surface, but also the one in which the light incident surface is provided on a plurality of end surfaces. For example, a second light incident surface may be provided on an end surface facing or adjacent to the first light incident surface, or a second light incident surface may be provided on an end surface facing the first light incident surface. Good. Further, a third light incident surface may be provided on an end surface adjacent to the first and second light incident surfaces. At this time, it is needless to say that a desired number of linear light sources described later can be provided along each light incident surface.

[0010] The light guide plate may be provided with a reflection means on the surface opposite to the light exit surface. This reflecting means can be formed by sticking a silver sheet or a white resin sheet having a high reflectivity, or by applying a white pigment or the like to the light guiding means. Further, a reflector having a high reflectance may be provided separately from the light guide plate. Further, it is also allowed that the reflecting means is provided with a process capable of printing a dot pattern or optically distributing light such as minute unevenness in the light emitting surface direction.

[0011] The light guide plate may be formed by using a plurality of flat body members. For example, two light guide plates may be provided so that their reflection surfaces overlap each other so as to provide a plurality of light emission surfaces, and the light emission surfaces may be provided in directions different by 180 °, or only one light emission surface may be provided. However, the light emitting efficiency can be improved by using a plurality of flat main bodies so as to be stacked. The use of a plurality of the plate-shaped main bodies is generally more widely adopted and can be used to form a thick light guide plate using a low-priced light guide plate. A light guide plate that can be easily formed and that can be inexpensive can be provided.

The display plate may be any display means such as a light-transmitting flat display panel or a liquid crystal display panel, and the material and structure are not particularly limited. In addition, those directly provided on the light guide plate are also allowed.

The display plate is provided on the light exit surface side of the light guide plate. When a plurality of light guide plates are provided, a display plate is provided for each light exit surface. The display plate is provided with a display portion that is illuminated by light emitted from the light emitting surface of the light guide plate and displays characters, designs, images, images, or the like, and prints a desired paint on a translucent resin, glass, or the like. And a liquid crystal panel.

The total length of the linear light source is shorter than the length of the light incident surface of the light guide plate in the longitudinal direction, and a plurality of linear light sources are linearly arranged along the longitudinal direction of the light incident surface. Thus, it is provided over almost the entire area of the light incident surface.

The linear light source is a discharge lamp having electrodes at both ends, and it is desirable to use a fluorescent lamp which is turned on with relatively high efficiency. However, the type of the light source is not particularly limited as long as it is turned on with a desired output by being supplied with power from both ends, and may be an LED or the like.

When a fluorescent lamp is used, a preferred fluorescent lamp is a glass tube which is a translucent container, a pair of electrodes sealed at both ends of the glass tube, a phosphor layer formed on the inner surface side of the glass tube, and glass. It comprises a discharge medium sealed in a tube. Examples of the discharge medium include those composed of mercury and a rare gas, and those mainly composed of a rare gas such as xenon. When the electrode is a thin glass tube having a small tube diameter, a cold cathode is mainly used, but a hot cathode may be used. However, it is also possible to use an electrodeless fluorescent lamp. The fluorescent lamp can have any shape as long as it has a linear portion.

Any number of linear light sources can be used according to the area of the light emitting surface and the desired luminance. When the area of the light emitting surface is large, a plurality of linear light sources are required to increase the amount of incident light. By providing the linear light source in parallel along the light incident surface, it is also allowed to secure desired luminance.

The pair of linear light sources are electrically connected to the lighting device, so that the pair of linear light sources are positioned in a direction having a relationship in which adjacent electrodes of the pair of linear light sources have substantially the same potential during lighting. . By being connected in such a positioning relationship, even if adjacent portions of a pair of linear light sources are close to each other, there is almost no potential difference between them, and it is not necessary to provide a special insulating treatment.

As the display device, a guide light, a guide display board,
Examples include, but are not limited to, advertising lights and liquid crystal display devices.

In the display device, when the linear light source is turned on, light is incident on the light guide plate, and the light propagating inside the light guide plate is emitted from the light exit surface to irradiate the display plate.

The display device according to the first aspect of the present invention is configured such that the linear light sources are connected to the lighting device by being positioned in such a direction that the potentials of adjacent electrodes of the pair of linear light sources become substantially the same. Therefore, it is not necessary to perform a special insulating treatment between adjacent electrodes, and it is easy to manufacture a display device having a large light guide plate, and the cost can be reduced.

According to a second aspect of the present invention, in the display device of the first aspect, the pair of linear light sources have lead wires extending from both ends thereof, and when the lead wires are connected to the lighting device side, It is characterized in that the lead wires on the adjacent sides of a pair of linear light sources are wired so as to have the same polarity.

The lead wire supplies power supplied from the lighting device to the linear light source.

The lead wires are wired so as to satisfy an arrangement condition that allows connection to the lighting device side only when adjacent lead wires of a pair of linear light sources have the same polarity.

In the display device according to the second aspect of the present invention, since the linear light source is positioned by connecting the lead wire and the lighting device, a large-sized display device can have a simpler configuration.

According to a third aspect of the present invention, in the display device of the second aspect, the pair of linear light sources are held one by one by linear light source holding members fitted to the light incident surface of the light guide plate. The lead wire is connected to the lighting device side of the linear light source holding member so that it can be connected to the lighting device side only when the lead wire is led out from an adjacent side of the pair of linear light sources. It is characterized by being wired.

The linear light source holding member may be provided with a reflector such as a reflection sheet on the inner side, and the reflection sheet or the like may be formed so as to surround the linear light source. At this time, it is desirable that the linear light source be held in a lamp holder or the like provided in the linear light source holding member so as to be easily attached and detached.

Also, the linear light source holding member may be formed so as to be able to hold a plurality of linear light sources.

Further, when the area of the light emitting surface is large, the linear light source holding member is desirably provided by providing a plurality of linear light source holding members in parallel along the light incident surface in order to increase the amount of incident light. Brightness can be obtained.

The lead wire is wired on the lighting device side of the linear light source holding member, and can be connected to the lighting device only when a pair of linear light sources are led out from the adjacent side. I have. If the lead wire is led out from any other direction, the lead wire is not connected to the lighting device side, so that the polarities of the adjacent lead wires are always the same.

As means for restricting the connection between the lead wire and the lighting device side, the lead-out length of the lead wire may be adjusted so as not to reach the lighting device side depending on the direction of the linear light source, or the lead wire insertion may be performed. Examples include, but are not limited to, limiting the positions of the holes.

The "lighting device side" of the linear light source holding member is as follows.
A lead wire for supplying power to the linear light source is led out from a direction opposite to the light emitting surface side and is connected to a lighting circuit of the apparatus main body.

The display device according to the third aspect of the present invention can be connected to the lighting device only when the lead wire is on the lighting device side of the linear light source holding member and is led out from an adjacent side of the pair of linear light sources. Therefore, positioning can be performed without using special positioning means so that the electrical polarity of the adjacent lead wires is always the same.

The display device according to the fourth aspect is the display device according to the first to third aspects.
The display device according to any one of the above, wherein the linear light source has a base, and a pair of linear light sources is provided so that at least a part of the base exceeds a range of a light incident surface. And

The area from which the light from the linear light source is emitted is the range of a light-transmitting container such as a glass tube forming the linear light source. When the end of the linear light source such as a base is provided on the light incident surface of the light guide plate, no light is incident on the light incident surface near the end of the linear light source. In some cases, the brightness of the display panel was uneven. However, in the present invention, since the base can be provided beyond the range in the longitudinal direction of the light incident surface, light from the linear light source can be effectively incident on the light incident surface.

Note that "beyond the range in the longitudinal direction of the light incident surface" means that at least a part of the base of the linear light source is
This means that it is provided so as to protrude from the light incident surface in the longitudinal direction of the light incident surface.

According to a fourth aspect of the present invention, at least a part of the base of the linear light source is provided so as to protrude more than the light incident surface in the longitudinal direction of the light incident surface. From the light can be effectively incident on the light incident surface.

The display device of claim 5 is the display device of claims 1 to 4
The display device according to any one of the above aspects, wherein a brightness enhancement unit is provided at a portion of the light guide plate facing portions of the pair of linear light sources adjacent to each other.

In the present invention, a pair of linear light sources are provided along the longitudinal direction of the light incident surface in order to obtain a desired luminance uniformity on the display panel. Therefore, it is preferable to provide some brightness improving means in the region of the light guide plate corresponding to the end of the linear light source.

The "location of the light guide plate" provided with the brightness improving means may be any one of the light exit surface side, the light exit surface side, and both surfaces of the light guide plate.

The brightness improving means is defined in the same configuration as the light distribution means defined in claim 1. However, the present invention may be provided with a brightness improving unit using a method different from the light distribution unit provided on the light guide plate.

In the display device according to the fifth aspect of the present invention, since the brightness improving means is provided between the adjacent linear light source holding members, variations in light emitted from the light emitting surface are eliminated, and uneven brightness of the display panel is prevented. be able to.

According to a sixth aspect of the present invention, the guide light includes a display panel having a display section for indicating an evacuation direction.
A display device according to any one of the above, and an emergency lighting device that switches from a commercial power supply to an emergency power supply to turn on a linear light source when a power failure occurs.

According to a sixth aspect of the present invention, there is provided a guide light having the function of any one of the first to fifth aspects.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing a guide light according to an embodiment of the present invention, FIG. 2 is a partially cutaway perspective view showing an assembled state of the guide light of FIG. 1, and FIG. 3 is a guide light of FIG. FIG. 4 is an enlarged front view of an essential part showing a state in which the cover member 59 of the lamp and the display plate 3 are removed, and FIG. 4 is a cross-sectional view of the guide lamp shown in FIG. It is a principal part enlarged rear view which shows the state which removed.

In each figure, 1 is a light guide plate, 2 is a cold cathode fluorescent lamp as a linear light source, 21 is a first linear light source holding member, 22 is a second linear light source holding member, and 3 is a display plate. , 5
Denotes an apparatus main body, 6 denotes a concave / convex portion as a luminance improving means, and 9 denotes a lead wire. Each of the drawings is a schematic diagram in which the dimensional ratio and the like are slightly changed for simplification of the structural description, and does not represent an actual dimensional relationship.

The configuration and assembly of this embodiment will be described with reference to FIGS.

The light guide plate 1 has a flat main body formed of a transparent acrylic resin, and has a light incident surface 11 on an upper end surface and a light exit surface 12 on one surface. A light diffusion sheet (not shown) and a prism sheet (not shown) are attached to the light emitting surface 12 for improving the brightness. On the surface opposite to the light emitting surface 12, a plurality of uneven prism cuts (not shown) are formed in a desired pattern as luminance equalizing means. Further, a reflecting plate 8 made of aluminum metal is provided on the prism cut surface.

The light guide plate 1 is provided with three fixing portions 5A for fixing to the apparatus main body 5 together with the reflection plate 8.

The light guide plate 1 has a vertical dimension of 435 mm, a horizontal dimension of 420 mm, and a thickness of 16 mm. The reflector 8 has a vertical dimension of 435 mm, a horizontal dimension of 420 m, and a thickness of 0.5 m.
m.

The cold-cathode fluorescent lamp 2 has a straight tube shape, and is provided inside the first linear light source holding member 21 and the second linear light source holding member 22 along the longitudinal direction of the light incident surface 11.
2a and 2b are held linearly, and a reflection sheet 23 opened toward the light incident surface 11 of the light guide plate 1 is disposed inside the first and second linear light source holding members 21 and 22. Have been.

The display panel 3 is formed of a translucent milky white acrylic resin in the shape of a flat plate, and a display pattern 31 is printed on the outer surface of the display panel 31 as a display portion of an arrow indicating an evacuation direction with a green translucent paint. ing. The display panel 3 has a vertical dimension of 42
0 mm, lateral dimensions are 420 mm, and thickness is 2 mm.

The apparatus main body 5 is formed of a steel plate and has an opening 51.
And a supporting portion 5B for supporting and fixing the light guide plate 1 and the reflection plate 8 is provided, and a lighting device 54 is housed inside. The lighting device 54 includes a terminal block to which a commercial power supply line is connected, a high-frequency inverter, a battery, and the like. The lighting device 54 detects a drop in the input voltage of the commercial power supply, and performs switching so that the cold cathode fluorescent lamp 2 is turned on by a battery when the voltage is below a certain voltage level in an emergency. Note that the lighting device 54 may be provided with a charge monitoring circuit.

The apparatus main body 5 has a cover member 59. The cover member 59 is formed by punching a steel plate into a substantially rectangular shape having an opening, and a portion serving as a peripheral wall portion 55 is formed by a frame portion 56.
Are bent inward by about 90 ° from the portion to be formed to form four cylindrical portions. The cover member 59 has a cover member opening 57 formed by the peripheral wall 55 and the frame 56.

The apparatus main body 5 can be fixed to a ceiling or the like by fixing anchor bolts suspended from a ceiling structure (not shown) to the holes 58.

In the guide lamp of this embodiment, the cold cathode fluorescent lamps 2a and 2b are turned on by the lighting device 54 using a commercial AC power supply at all times, and an emergency power supply such as a battery in an emergency. Light emitted from a total of two cold cathode fluorescent lamps 2a and 2b held by the linear light source holding members 21 and 22 enters the light incident surface 11 of the light guide plate 1 and propagates through the light guide plate 1 to emit light. The light emitted from the emission surface 12 illuminates the display panel 3 to display the evacuation direction.

Next, the assembly of the guide light according to the present embodiment will be described. As shown in FIG.
The first and second linear light source holding members 21 and 22 holding the pair of cold cathode fluorescent lamps 2a and 2b
Are fitted to the light incident surface 11 in such a direction that adjacent electrodes are on the stable potential side (ground potential side). Then, the light guide plate 1 and the reflection plate 8 in a state of being superimposed are fixed so as to be tightly fitted between the fixing portions 5A, 5A, 5A having a crank-shaped cross section and the supporting portion 5B of the apparatus main body 5. At this time, the holes 5c provided in the fixing portions 5A, 5A, 5A and the support portions 5B
The light guide plate 1 sandwiched between the fixing portions 5A, 5A, 5A and the support portions 5B, 5B, 5B by tightening with fixing means (not shown) such as screws so that the holes 5d provided in the light guide plate 5d coincide with each other. And the reflection plate 8 is fixed to the apparatus main body 5 side.

Next, the display plate 3 is provided on the cover member 59 so as to be held by fitting means (not shown) so as to correspond to the cover member opening 57 shown in FIG. Then, a cover member 59 provided with the display plate 3 is attached to the apparatus main body 5 side by an engaging means (not shown) so that the display plate 3 is disposed immediately above the light emitting surface 12 of the light guide plate 1.

In this embodiment, the light incident surface 11 is provided on the upper end surface. However, the light incident surface 11 may be provided on the upper end surface and the lower end surface, or the light incident surface 11 may be provided on the side end surface. May be provided on both sides of one side or the opposite side end face. When the light incident surface 11 is formed on the side end surface, the first and second linear light source holding members 21 and 22 are formed more than when the light incident surface 11 is formed on the upper end surface or the lower end surface.
Of the cold cathode lamps 2a and 2b can be easily replaced.

The main part of this embodiment will be described with reference to FIG. FIG. 3 is an enlarged view of a main part in a state where the cover member 59 and the display panel 3 are removed, as viewed from the X direction (front) in FIG.

The adjacent cathodes 60 of the cold-cathode fluorescent lamps 2a and 2b of the guide lamp assembled as shown in FIGS. 1 and 2 are positioned in such a direction that they are on the stable potential side. This is provided so that the electrical connection with the lighting device 54 by the wiring of the lead wire 9 described in the description of FIG.
Further, at least a part of the base 7 of each of the cold cathode fluorescent lamps 2 a and 2 b is provided so as to protrude more than the light incident surface 11 in the longitudinal direction of the light incident surface 11.

The main part of this embodiment will be described with reference to FIG. FIG. 4 is a cross-sectional view of the main body 5 when the intermediate portion is split in the vertical direction and a state in which the reflection plate 8 is removed is shown by enlarging a main part viewed from the Y direction (back side) in FIG.

The first and second linear light source holding members 21,
The lead wire 9 derived from 22 is wired such that adjacent lead wires 9a and 9b have the same polarity. With such wiring, the cold cathode fluorescent lamp 2
Positions are set so that the potentials on the adjacent sides 60 a and 2 b are on the stable potential side.

In addition, the lead wire 9 is opposite to the light emitting surface 12 on the lighting device side so that the electrical connection with the socket 53 led out from the lighting device 54 becomes impossible unless the above conditions are satisfied. It is derived from the side 13 and from the adjacent side 60 of the cold cathode lamps 2a, 2b. The length of the lead wire 9 led out from the adjacent side 60 depends on the socket 5 when the cold cathode fluorescent lamps 2a and 2b do not satisfy the arrangement relation consisting of appropriate directions and positions.
3 is adjusted so that it cannot be connected. When the lead wire 9 is led out to the light emitting surface 12 side, the opening through which the lead wire is inserted is closed, so that the connection with the socket 53 cannot be made.

In addition, at the position on the opposite surface side 13 of the light guide plate 1 which faces the adjacent side 60 of the cold cathode fluorescent lamps 2a and 2b, a brightness-enhancing means which is an uneven groove whose interval is narrower than the above-mentioned prism cut. Is provided.

The guide light of this embodiment is arranged such that the adjacent lead wires 9a and 9b are wired so as to have the same polarity, and
4, the cold cathode fluorescent lamps 2a and 2b are positioned so that the potential on the adjacent side 60 of the cold cathode fluorescent lamps 2a and 2b is always on the stable potential side. Even if the end portions are brought close to each other in order to reduce the non-light-emitting region between 2a and 2b, there is no need to perform a special insulating treatment between the adjacent electrodes, and the large light guide plate 1
And the cost can be reduced. In addition, since no leakage current occurs between the adjacent electrodes, it is possible to prevent the luminous flux of the cold cathode fluorescent lamps 2a, 2b from decreasing.

The lead wire 9 is connected to the linear light source holding member 21,
Since it is possible to connect to the lighting device 54 only on the opposite side 13 which is the lighting device side of 22 and from the adjacent side 60 of the cold cathode fluorescent lamps 2a and 2b, special positioning means is required. Without use, positioning can be performed such that the electrical polarity of the adjacent lead wires 9a and 9b is always the same.

The lead wire 9 is connected to the opposite surface 13 of the light guide plate 1.
By being led out only from the side direction, it is possible to make the appearance favorable, and it is possible to prevent problems such as disconnection.

Further, since at least a part of the base 7 of the cold cathode fluorescent lamps 2a, 2b is provided so as to protrude from the light incident surface 11 in the longitudinal direction of the light incident surface 11, the cold cathode fluorescent lamps 2a, 2b are provided. Light from the light incident surface 1
1 can be incident. Further, by using the cold cathode fluorescent lamps 2a and 2b having a relatively long life, the frequency of replacement work of the light source can be suppressed.

Although the present embodiment relates to a guide light, the present invention is not limited to this, and a guide sign, an advertising light,
The present invention is applicable to various display devices including a sidelight type backlight, such as a liquid crystal monitor.

According to the first aspect of the present invention, the linear light sources are positioned in such a direction that the potentials of adjacent electrodes of the pair of linear light sources become substantially the same, so that the linear light sources are connected to the lighting device. With this configuration, there is no need to perform a special insulating process between adjacent electrodes, and there is no reduction in the luminous flux of the linear light source. Therefore, a large-sized display device that can be easily manufactured and whose cost can be reduced is provided. it can.

According to the second aspect of the present invention, the linear light source is positioned by connecting the lead wire and the lighting device.
A large-sized display device having a simpler configuration can be provided.

According to the third aspect of the present invention, it is possible to connect to the lighting device only when the lead wire is led out from the lighting device side of the linear light source holding member and from the adjacent side of the pair of linear light sources. Therefore, it is possible to provide a display device capable of performing positioning such that adjacent leads always have the same electrical polarity without using special positioning means.

According to the fourth aspect of the present invention, at least a part of the base of the linear light source is provided so as to protrude from the light incident surface in the longitudinal direction of the light incident surface. It is possible to provide a display device that can make light incident on the light incident surface effectively.

According to the fifth aspect of the present invention, since the brightness improving means is provided between the adjacent linear light source holding members, it is possible to eliminate the variation of the light emitted from the light emitting surface and to prevent the brightness unevenness of the display panel. A display device that can be provided.

According to the invention of claim 6, it is possible to provide a guide light having the effect of any one of claims 1 to 6.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a guide light according to an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing the assembled state of FIG. 1;

FIG. 3 is an enlarged front view of an essential part showing a state where a part of FIG. 2 is removed;

FIG. 4 is an enlarged rear view of an essential part showing a state where a part of FIG. 2 is removed;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Light guide plate, 2, 2a, 2b ... Cold cathode fluorescent lamp as a linear light source, 21 ... First linear light source holding member, 22 ... Second linear light source holding member, 3 ... Display plate, 5 ... Device main body 6: Uneven portion as brightness enhancement means 9: Lead wire

Continued on the front page (72) Inventor Tatsuo Maruyama 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Toshiba Litec Co., Ltd. F-term (reference) 5C096 AA27 BA01 CB01 CC10 CD02 DA01 FA01

Claims (6)

[Claims] An apparatus main body having an opening formed therein and a lighting device housed inside the opening; a flat main body, a light emitting surface provided on one surface of the flat main body, and substantially orthogonal to the light emitting surface. A light guide plate provided on the opening side of the device main body, having a light incident surface provided on an end surface of the light guide plate; a display plate provided on a light exit surface side of the light guide plate; A pair of linear light sources which are linearly arranged and positioned by electrical connection with the lighting device so that the potentials of the electrodes adjacent to each other become substantially the same during lighting. Display device. 2. A pair of linear light sources have lead wires extending from both ends thereof. When the lead wires are connected to the lighting device side, the lead wires of the pair of linear light sources adjacent to each other are connected to each other. The display device according to claim 1, wherein the display device is wired so as to have the same polarity. 3. A pair of linear light sources are held one by one by linear light source holding members fitted to a light incident surface of a light guide plate,
The lead wire is on the lighting device side of the linear light source holding member,
3. The display device according to claim 2, wherein the linear light source is wired to the linear light source holding member so that the linear light source can be connected to the lighting device only when the linear light source is led out from an adjacent side. 4. The linear light source has a base, and a pair of linear light sources is provided so that at least a part of the base exceeds a range of a light incident surface. The display device according to any one of claims 1 to 3. 5. The display device according to claim 1, wherein a brightness improving means is provided at a position of the light guide plate facing a part of the pair of linear light sources adjacent to each other. 6. The display device according to claim 1, further comprising: a display panel having a display unit for indicating an evacuation direction; and turning on a linear light source by switching from a commercial power supply to an emergency power supply during a power failure. And an emergency lighting device.