JP5899435B2 - Display device - Google Patents

Description

The present invention relates to a display device using a LED light emitting unit as a light source and having a display sheet illuminated from the back side.

  2. Description of the Related Art Conventionally, a surface display device that uses a light emitting diode as a light source and performs backlight illumination of a liquid crystal display device or the like is known (for example, see Patent Document 1).

  As shown in FIG. 6, the display device 100 described in Patent Document 1 includes a plurality of LEDs 102 and LED substrates 103 and 103 along two opposing inner side surfaces of a rectangular unit case 101 having a small dimension in the thickness direction. The LED unit 104 formed from the above is disposed. A surface light emitting member 108 having a light emitting surface 108 </ b> A is provided on one surface of the unit case 101. In addition, LED collimators 105 and 105 in which a plurality of LEDs 102 are housed in concave grooves are disposed, and a light reflecting surface member 107 is provided in the hollow light guide region 106 of the unit case 101.

  Accordingly, substantially collimated light is emitted from the collimators 105 and 105 toward the hollow light guide region 106 in the direction of the optical axis of the LED 102, reflected by the light reflecting surface member 107, and emitted from the light emitting surface 108A of the surface light emitting member 108. By doing so, uniform surface illumination is possible.

JP 2009-252380 A (FIG. 2)

  By the way, the display device 100 described in Patent Document 1 described above is used, for example, for backlight illumination of a liquid crystal display device. For example, the display device 100 is hung from above in a station premises, etc. You may want to display advertisements or timetables. Even in such a case, a display device that emits light with a uniform and high luminance display surface is desired.

The present invention has been made to solve the conventional problems, and an object of the present invention is to provide a display device that can emit light with uniform and high luminance.

  The display device of the present invention is provided with a housing having a translucent display sheet on the surface, a plurality of LED light emitting units provided along an edge of the housing, and the LED light emitting units. A reflection plate that reflects light from the LED light emitting section toward the display sheet, the reflection plate having a parabolic curved reflection surface, and a nonflammable sheet for the display sheet.

  In the display device of the present invention, the LED light emitting unit is disposed so that the optical axis thereof is directed in a direction along the display plate sheet, and the optical axis is reflected in front of the irradiation direction of the LED light emitting unit. A lens to be refracted is provided on the plate side.

  In the display device of the present invention, the reflecting plate is provided on both sides of the LED light emitting unit.

  In the display device of the present invention, the LED light emitting units are provided in two rows facing each other.

  Furthermore, in the display device of the present invention, the arrangement interval of the LED light emitting units is larger at the end than at the center.

  The present invention, when projecting light from a plurality of LED light emitting units provided along the edge of the housing onto a translucent display sheet provided in the housing via a reflector, Since the reflecting plate is formed with a parabolic curved surface, it is possible to provide a display device that has the effect of suppressing the luminance in the vicinity of the LED light emitting portion and allowing the display sheet to emit light uniformly and with high luminance.

(A) is sectional drawing of the AA position in (B) which shows the optical path in the display apparatus of 1st Embodiment which concerns on this invention, (B) is sectional drawing of the BB position in (A). (A) is sectional drawing of the AA position in (B) which shows the optical path in the display apparatus of 2nd Embodiment which concerns on this invention, (B) is sectional drawing of the BB position in (A). (A) is sectional drawing of the AA position in (B) which shows the optical path in the display apparatus of 3rd Embodiment which concerns on this invention, (B) is sectional drawing of the BB position in (A). (A) is sectional drawing of the AA position in (B) which shows the optical path in the display apparatus of 4th Embodiment which concerns on this invention, (B) is sectional drawing of the BB position in (A). (A) is sectional drawing of the AA position in (B) which shows the optical path in the display apparatus of 5th Embodiment concerning this invention, (B) is sectional drawing of the BB position in (A). Sectional view of a conventional display device

(First embodiment)
Hereinafter, a display device according to a first embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the display device 10 </ b> A according to the first embodiment of the present invention can be used, for example, as a display board that displays advertisements, timetables, and the like by hanging from above in a station premises or the like.

  The display device 10 </ b> A has a hanger 11 that is hung from an attached portion such as a ceiling, and has a box-shaped housing 20 </ b> A that is attached to the lower end of the hanger 11. The housing 20A has a rectangular frame-shaped frame member 21 having a top plate 211, a bottom plate 212, and left and right side plates 213, 214. A back plate 22 is attached to one opening, and the other opening is A translucent display sheet 23 is provided.

  A mounting plate 24 is attached downward from the inner surface of the top plate 211, and a plurality of LED light emitting units 30 are attached to the mounting plate 24 at predetermined intervals. The LED light emitting units 30 are attached rearward (toward the back plate 22 side), and are arranged at an equal pitch P0 at the center and at pitches P1 and P2 larger than the pitch P0 at the ends. That is, the central pitch P0 is smaller than the end pitches P1 and P2, and P0 <P1 <P2. Note that the number of pitches to which the end pitches P1, P2, etc. are applied is not particularly limited, and it is sufficient that there is at least one pitch.

  The mounting plate 24 and the LED light emitting unit 30 are provided along the top plate 211 which is the longitudinal direction of the housing 20A.

  A reflecting plate 31 is attached to the back plate 22 side so as to face the LED light emitting unit 30. The reflection plate 31 is formed with a parabolic curved surface or an approximate parabolic curved surface, and is provided over the entire width along the top plate 211 at the upper portion of the housing 20A.

  A power supply unit 32 is disposed on the bottom plate 212 of the housing 20A. In addition, a reinforcing member 25 that reinforces the joining between the hanger 11 and the housing 20 </ b> A is attached to the side plates 213 and 214, and a breaker 33 is attached to the reinforcing member 25.

  Therefore, the optical axis L emitted backward from the LED light emitting unit 30 is reflected forward by the reflecting plate 31 and is irradiated over the entire vertical width of the display sheet 23.

  The LED light emitting unit 30 and the reflecting plate 31 are disposed closer to the frame member 21 than the display sheet 23.

  As described above, according to the display device 10A according to the first embodiment of the present invention described above, the light from the plurality of LED light emitting units 30 provided along the edge of the housing 20A is transmitted through the reflector 31. When light is projected onto the translucent display sheet 23 provided on the body 20A, the reflector 31 is formed with a parabolic curved surface, so that the luminance near the LED light emitting unit 30 is suppressed and the display sheet 23 is made uniform. Can emit light with high brightness.

  Further, since the arrangement interval P of the LED light emitting units 30 is set to be larger at the end portions (P1, P2) than at the central portion (P0), the luminance of the end portion of the display sheet 23 is suppressed, and the entire display sheet 23 is made uniform. It is possible to emit light with a luminance of.

  The display sheet 23 is a sheet made of a non-combustible material and has non-combustibility. As a result, the Building Standards Act (Article 66 “Signboards, advertising towers, decorative towers, and other similar structures in fire prevention areas, such as those provided on the roof of buildings, or those exceeding 3 m in height, The main part must be made of non-combustible material or covered. ”) It can also be installed in a fire-proof area specified in“). The display sheet 23 has a back layer made of fluororesin, an intermediate layer made of glass fiber, and a surface layer made of fluororesin. As the display sheet 23, a sheet whose surface layer is further coated with a resin may be used.

  The display sheet 23 may be used by drawing on the sheet by inkjet.

Further, when the display sheet 23 is attached to the housing 20A, the tension on the surface of the display sheet 23 can be adjusted by attaching the display sheet 23 using an extension fitting. As this extension metal fitting, a metal fitting that has been commercially available may be used.
(Second Embodiment)
Next, a display device 10B according to a second embodiment of the present invention will be described with reference to the drawings.

In addition, suppose that the same code | symbol is attached | subjected to the site | part which is common in 10 A of display apparatuses concerning 1st Embodiment mentioned above, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 2, in the display device 10 </ b> B of the second embodiment, the LED light emitting unit 30 is attached downward so that the optical axis L is emitted in parallel with the display sheet 23. A lens 34 that refracts the optical axis L from the downward LED light emitting unit 30 in the direction of the rear reflector 31 is attached in front of the LED light emitting unit 30 in the irradiation direction.

  As the lens 34, for example, a disk-shaped or cylindrical shape with a recessed center can be considered. The casing 20B can be the same as the casing 20A of the first embodiment.

  Therefore, the optical axis L emitted downward from the LED light emitting unit 30 is refracted by the lens 34 and is applied to the rear reflector 31. The optical axis L incident on the parabolic curved reflector 31 is reflected forward, diffused and irradiated on the front surface of the display sheet 23, and the front surface of the display sheet 23 emits light.

As described above, according to the display device 10B according to the second embodiment of the present invention described above, the LED light emitting unit 30 is disposed so that the optical axis L is directed in the direction along the display sheet 23, and the LED light emitting unit 30 is irradiated. Since the lens 34 that refracts the optical axis L toward the reflecting plate 31 is provided in the forward direction, the optical axis L from the LED light emitting unit 30 can be efficiently directed to the reflecting plate 31, and the display sheet 23 emits light uniformly. Can be made.
(Third embodiment)
Next, a display device 10C according to a third embodiment of the present invention will be described with reference to the drawings.

  In addition, the same code | symbol is attached | subjected to the site | part which is common in the display apparatus 10A concerning 1st Embodiment mentioned above, or the display apparatus 10B concerning 2nd Embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 3, the display device 10C according to the third embodiment has display sheets 23 on both sides of the housing 20C. The LED light emitting unit 30 is disposed on the top plate 211 side, and a pair of reflecting plates 31 are provided on both sides of the LED light emitting unit 30.

  Accordingly, the optical axis L1 emitted rearward from the LED light emitting unit 30 is incident on the rear reflector 31 and reflected forward, causing the front display sheet 23 to emit light. On the other hand, the optical axis L2 emitted forward from the LED light emitting unit 30 enters the front reflector 31 and is reflected rearward, causing the rear display sheet 23 to emit light.

As described above, according to the display device 10 </ b> C of the third embodiment according to the present invention described above, the reflectors 31 are provided on both sides of the LED light emitting unit 30. The two display sheets 23 and 23 facing each other at 20 C can emit light, and advertisements, timetables, and the like can be displayed on both sides of the housing 20C.
(Fourth embodiment)
Next, a display device 10D according to a fourth embodiment of the invention will be described with reference to the drawings.

  In addition, the same code | symbol is attached | subjected to the site | part which is common in the display apparatus 10A concerning the display apparatus 10A concerning 3rd Embodiment thru | or 3rd Embodiment mentioned above, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 4, in the display device 10 </ b> D of the fourth embodiment, the display sheet 23 is provided on one side of the housing 20 </ b> D, and the reflectors 31 are provided on both sides of the LED light emitting unit 30. Yes. Further, a flat plate-like second reflecting plate 35 is provided inside the back plate 22 (on the left side in FIG. 4A).

  Accordingly, the optical axis L1 emitted rearward from the LED light emitting unit 30 is incident on the rear reflector 31 and reflected forward to cause the display sheet 23 to emit light. On the other hand, the optical axis L <b> 2 emitted forward from the LED light emitting unit 30 is incident on the front reflector 31 and reflected backward, and further reflected by the second reflector 35 provided inside the back plate 22. Then, the display sheet 23 is caused to emit light.

As described above, according to the display device 10D of the fourth embodiment according to the present invention described above, the front and rear reflecting plates 31 and 31 and the second reflecting plate 3 emit light emitted forward and backward from the LED light emitting unit 30. Since the light is reflected by 5 and is incident on the display sheet 23, the display sheet 23 can efficiently emit light with high luminance. In particular, light emission from the lower portion of the display sheet 23 far from the LED light emitting unit 30 can be promoted.
(Fifth embodiment)
Next, a display device 10E according to a fifth embodiment of the invention will be described with reference to the drawings.

  In addition, the same code | symbol is attached | subjected to the site | part which is common with display apparatus 10D concerning 10 A thru | or 4th Embodiment concerning the 1st Embodiment mentioned above, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 5, the display device 10E according to the fifth embodiment includes display sheets 23 and 23 on both sides of the housing 20E. Further, two rows of LED light emitting units 30, 30 are provided opposite to the top plate 211 side and the bottom plate 212 side of the frame member 21, and the reflecting plates 31 are provided on both sides of each LED light emitting unit 30. .

  Accordingly, the optical axis L1 emitted rearward from the upper LED light emitting unit 30 is incident on the rear reflector 31 and reflected forward to cause the front display sheet 23 to emit light. On the other hand, the optical axis L2 emitted forward from the upper LED light emitting unit 30 is incident on the front reflecting plate 31 and reflected rearward to cause the rear display sheet 23 to emit light. Similarly, the lower LED light emitting unit 30 is irradiated with the light L3 and L4 and reaches the front and rear display sheets 23 and 23.

  When the display sheet 23 is large, a reflection plate 36 having a rhombus cross section can be provided in the center of the cross section of the housing 20E.

  As described above, according to the display device 10E of the fifth embodiment according to the present invention described above, since the LED light emitting units 30 and 30 are provided in two rows so as to face each other, the display sheet 23 can emit light with high luminance. it can.

  The display device of the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made.

10A to 10E Display device 23 Display sheet 20A to 20E Case 30 LED light emitting unit 31 Reflector plate 34 Lens L Optical axis P Arrangement interval

Claims (3)

A housing having a translucent display sheet on the front surface and the back surface;
A plurality of LED light emitting units provided along an edge of the housing;
A reflector that is provided along the LED light-emitting portion and reflects light from the LED light-emitting portion toward the display sheet;
The reflector has a parabolic curved reflecting surface, and a non-combustible sheet is used for the display sheet .
The said reflecting plate is provided in both sides on both sides of the said LED light emission part, and reflects the light from the said LED light emission part to the said display sheet provided in the surface and the back surface of the said housing | casing . The display device according to claim 1 ,
A display device in which the LED light emitting units are provided in two rows facing each other. The display device according to any one of claims 1 or claim 2,
A display device in which the arrangement interval of the LED light emitting units is larger at the end than at the center.