JP2008276124A - Simple display device for backlight - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device that is simply constituted of as few components as possible, which is placed on a counter or a table for use. <P>SOLUTION: An LED unit 21 is fixed on the bottom of a metallic holding frame 20 by using a thermal conductive double-sided adhesive tape while fixing an LED chip upward. Bolts 23 of pairs of supporting legs 22 are penetrated through and fastened by nuts 24 at both ends of the holding frame 20 in the longitudinal direction, and a light guide panel 10 and a metallic back panel 14 or the like on the back thereof are floated and supported to the holding frame 20 through a thermal conductive spacer 25. Also, a transparent panel 12 is removably arranged on the light guide panel 10 by a permanent magnet 31. Heat generated by the LED chip is dissipated by the holding frame 20 and the back panel 14, and also a display device A for backlight is obtained by removing the transparent panel 12 to thereby exchange a positive film. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a simple display device for backlighting used for advertising, decoration, etc. by a light-transmitting film on the surface.

  As a display device for this type of backlighting, for example, one that was first put into practical use by a light guide plate by the present inventors is known. According to this, a fluorescent lamp light source is accommodated in a sealed space in a housing. A light source unit, a holding case that is disposed on the upper surface of the light source unit, has a frame on the outer periphery and has an opening in the center, and an acrylic resin light guide panel that is disposed in the holding case. The light guide panel guides incident light in the light source separation direction as uniformly as possible by a light guide pattern formed on the back surface thereof, and then back-illuminates the light transmissive film disposed on the surface. This type of display device has been improved by using a diffusing material, a reflecting material and the like to further prevent the light guiding pattern from being seen through and to ensure a high degree of uniformity.

Japanese Patent No. 2623028

  In this case, it can be a display device used for advertising and decoration, but on the other hand, this type of display device is relatively complex due to the use of a large number of parts, as can be seen in later ones. The structure tends to increase in cost as well as the structure, and the holding case has a problem of giving a depressing impression in terms of design by arranging a frame. On the other hand, when an LED unit in which high-intensity LED chips are arranged in series as a light source for a light guide panel is used in such a display device, the high-intensity LED chip is accompanied with a considerable amount of heat generation, so that its heat dissipation is accurately performed. However, in the case of the light source unit, it is difficult to dissipate the heat. Therefore, the display device needs to dissipate the LED chip.

  The present invention has been made in view of such circumstances, and the problem to be solved is that it is possible to supply the whole as a simple structure as much as possible by using as few members as possible and to provide a high-brightness LED chip. Provided is a simple display device for backlighting that realizes backlighting with as high brightness as possible by using the LED and uses the high-brightness LED chip so that necessary heat dissipation can be achieved as easily and reliably as possible. It is in.

  In accordance with the above-described problems, the present invention simply configures a display device with as few parts as possible, such as a light guide panel, a transparent panel, a metal holding frame, an LED unit, and support legs for supporting the tilt of the holding frame. At the same time, the LED unit is mounted on the metal holding frame and the LED chip is faced up to the incident end face of the light guide panel, and the heat generation is held by bonding and fixing with a heat conductive double-sided tape or adhesive. Dissipating the frame as a heat dissipation means to solve the problem of heat generation using the high-intensity LED chip, while placing the light guide panel on the holding frame in the holding frame so as to keep the display device tilted backward This is done by supporting and floating and supporting by penetrating a plurality of support legs, and with respect to the light diffusing material arranged on the light guide panel or in front of it. The light can be easily attached and replaced by a permanent magnet so that the light transmissive film can be easily installed and replaced. A display device having a simple configuration in which a light transmissive film between a diffusing material and a transparent panel in front of the diffusing material is back-lit by an LED unit arranged in series with LED chips, wherein a magnetic material is applied to the light guide panel or the light diffusing material. By placing permanent magnets on the transparent panel corresponding to the body position, the transparent panel can be attached to and detached from the light guide panel, and heat conduction with the LED chip facing upward in the holding frame of the metal upward opening located below the light guide panel The LED unit is bonded with a conductive double-sided tape or a heat conductive adhesive, and the holding frame is used as a heat radiating means. A back surface, wherein the light guide panel is floated and supported from the LED chip by passing through a plurality of support legs arranged at a plurality of positions in the longitudinal direction of the holding frame and tilting and holding the holding frame at a predetermined angle. This is a simple display device for illumination.

  In addition to the above, the invention described in claim 2 can improve the degree of perfection as a display device by arranging a reflective material or a reflective material and a back panel on the light guide panel, thereby enabling the illumination brightness of the back illumination. 2. The simplified backlight for back lighting according to claim 1, wherein the light guide panel is provided with a reflective material or a reflective material and a back panel so that the light guide panel can be secured to an extremely high level. This is a display device.

  In addition to the above, the invention described in claim 3 similarly improves the degree of perfection as a display device by disposing a reflector and a metal back panel on the light guide panel, and the illumination brightness of the back illumination In addition, the heat dissipating efficiency of the display device is further improved by arranging the holding frame integrally or integrally with the back panel, and using the back panel as a heat dissipating means together with the holding frame. In this manner, the light guide panel is provided with a reflector and a metal back panel on the back surface of the light guide panel, and the holding frame is integrally or integrally disposed with the back panel. The back-lighting simple display device according to claim 1.

  According to a fourth aspect of the present invention, the light guide panel is supported by floating and supporting the light guide panel by supporting spacers arranged at a plurality of positions in the longitudinal direction of the holding frame so as not to contact the LED chip. Although the diffuser, reflector, and back panel are used, the display device is simply configured with as few parts as possible, and the problem of heat generation using the high-intensity LED chip is solved. This is a display device with a simple configuration in which a light diffusing material arranged in front of a light guide panel and a light transmissive film between the transparent panels in front of the light diffusing material are back illuminated by LED units arranged in series with LED chips. By arranging a magnetic body on the panel or the light diffusing material and a permanent magnet on the transparent panel corresponding to the position of the magnetic body, a transparent panel is formed on the light guide panel. And a reflective material and a back panel on the back side of the light guide panel, and a metal frame with an upward opening made of metal and a heat conductive double-sided holding frame with an upward opening made of metal. The LED unit is bonded with a tape or a heat conductive adhesive, and the holding frame is used as a heat dissipation means, while light is guided to the holding frame through support spacers at a plurality of positions in the longitudinal direction of the holding frame slightly higher than the LED chip. It is a simple display device for back lighting, characterized in that the panel is floated and supported from the LED chip.

  The present invention uses these as the gist of the invention and is a means for solving the above problems.

  Since the present invention is configured as described above, the present invention described in claim 1 can be applied to a light guide panel, a transparent panel, a metal holding frame, an LED unit, a support leg for supporting a tilting of the holding frame, and the like. The display device can be simply configured with as few parts as possible, and the LED unit is placed on the metal holding frame and the LED chip is faced up to the incident end face of the light guide panel. By fixing with an adhesive, the heat generation is dissipated using the holding frame as a heat dissipation means, and the problem of heat generation using the high-intensity LED chip is solved. This is done by supporting and floating and supporting by penetrating a plurality of support legs arranged in the holding frame so as to maintain the device in a backward tilted state, and the light guide panel On the other hand, the transparent panel is made detachable by a permanent magnet so that the light transmissive film can be easily installed and replaced, and the entire structure is supplied as a simple structure as much as possible at a low cost. It is possible to realize a backlight with as high brightness as possible by using a high brightness LED chip, and at the same time, it is possible to achieve the necessary heat dissipation as easily and reliably as possible. A simple display device for backlighting can be provided.

  In addition to the above, the invention described in claim 2 is characterized in that a reflective material or a reflective material and a back panel are arranged on the light guide panel, thereby improving the completeness of the display device and preventing the light guide pattern from being seen through. In addition, the illumination brightness of the back illumination can be ensured as high as possible.

  In addition to the above, the invention described in claim 3 similarly increases the degree of perfection as a display device by arranging a reflector and a metal back panel on the light guide plate, thereby increasing the illumination brightness of the back lighting. The display panel shall be further improved in heat dissipation efficiency by securing it as high as possible and arranging the holding frame integrally or integrally with the back panel to use the back panel as a heat dissipation means together with the holding frame. Can do.

  According to a fourth aspect of the present invention, the light guide panel is supported by floating and supporting the light guide panel by supporting spacers arranged at a plurality of positions in the longitudinal direction of the holding frame so as not to contact the LED chip. A diffuser, a reflector, and a back panel are used, but the display device is simply configured with as few parts as possible, and a display device that eliminates the heat generation problem using a high-brightness LED chip is used. Can do.

  Hereinafter, the present invention will be described in more detail with reference to examples of the drawings. In FIGS. 1 to 5, A represents a light guide panel 10, a light diffusing material 11, a transparent panel 12, a metal holding frame 20, an LED unit 21, A light-transmitting film between the light diffusing material 11 disposed in front of the light guide panel 10 and the transparent panel 12 in front of the light guide panel 10 is simply configured with as few parts as possible such as support legs 22 for supporting the holding frame tilt. It is a display device with a simple configuration in which the backside illumination is performed by the LED unit 21 arranged in series with the LED chip. The simple display device A corresponds to the position of the magnetic body 30 with the magnetic body 30 in the light guide panel 10 or the light diffusing material 11. Then, by disposing the permanent magnets 31 on the transparent panel 12, the transparent panel 12 can be freely attached to and detached from the light guide panel 10, and the metal upward facing below the light guide panel 10 is disposed. The LED unit 21 is bonded to the holding frame 20 of the mouth with the heat conductive double-sided tape or the heat conductive adhesive with the LED chip facing upward, and the holding frame 20 is used as a heat dissipation means, while the width direction of the light guide panel 10 A plurality of places are arranged at a plurality of places in the longitudinal direction of the holding frame 20, and the light guide panel 10 is floated and supported from the LED chip by penetrating a plurality of support legs 22 that tilt and erect the holding frame 20 at a predetermined angle. In this example, the light guide panel 10 includes a reflective material or a reflective material and a back panel on the back surface, and a reflective material 13 and a back panel 14 in the present example.

  The light guide panel 10 is formed by screen printing on the back side of a transparent resin plate such as acrylic or polycarbonate, or a light guide pattern by dots arranged in a single piece with a transparent resin plate, a hairline, etc. in this example. It is assumed that the incident light of the LED chip of the light source is incident from the incident end face at the lower end, and the back illumination is performed by the light guide pattern. At this time, the reflector 13 disposed on the back surface of the light guide panel 10 is For example, a white sheet such as polyester or foamed polyester is used, and reflection of the incident light in the light guide panel 10 is promoted by the reflector 13 so that the back lighting is performed as effectively as possible.

  The light diffusing material 11 is, for example, a light-transmitting white sheet having an irregular reflection function or a lens sheet having an irregular reflection function so that the light guide pattern formed on the light guide panel 10 does not pass through the front when the backlight is illuminated. For example, these are arranged in a stacked manner on the front surface of the light guide panel 10.

  The magnetic body 30 can be made of a ferromagnetic material such as an iron piece. In this example, a through-hole formed in the light diffusing material 11 is made of a thin stainless steel piece that is weaker than the iron piece. The light guide panel 10 is adhesively fixed to four corners of the light guide panel 10 or directly fixed to the four corners of the surface of the light diffusing material 11 so as to protrude from the surface.

  The back panel 14 is formed of a metal plate such as an aluminum plate or a coated iron plate, for example, and the reflective material 13 is exposed to the display device A, so that the reflective material 13 is drowned or damaged due to external force. In this example, the back panel 14 integrally holds the reflecting material 13 made of the white sheet on the front surface thereof, for example, by bonding. In the same manner, the light guide panel 10 is arranged in a laminated manner on the back surface.

  The transparent panel 12 is formed of a transparent resin plate such as acrylic or polycarbonate, or transparent glass, and in this example, a transparent resin plate, for example, with a height dimension shorter than that of the light guide panel 10 and the light diffusing material 11. , Permanent magnets 31 are arranged at four corners.

  At this time, for example, the permanent magnet 31 is fitted and disposed in a receiving hole formed in the transparent panel 12 as shown in FIG. 4, and is fixed to the magnetic body 30 fixed to the light guide panel 10 or the light diffusing material 11. The transparent panel 12 is detachably disposed on the light guide panel 10 or the light diffusing material 11 by adsorption. In this example, as shown in FIG. 4, for example, the permanent magnet 31 is embedded in a through-hole formed in the transparent panel 12 so as to be slightly protruded from the surface thereof and arranged. A cover member 32 made of, for example, an iron piece made of a magnetic material, particularly a ferromagnetic material, adhered to the periphery of the through hole of the transparent panel 12 is disposed, and the cover member 32 is fixedly attached to the permanent magnet 31 by suction. In this way, the permanent magnet 31 is attracted to the magnetic material 30 of the light guide panel 10 or the light diffusing material 11 in the present example as a stainless steel piece to hold the transparent panel 12 and the transparent panel. For example, by placing the hand on the upper end and pulling it to the front side, the transparent panel 12 is fitted to the light guide panel 10 or the light diffusing material 11 by using the difference in adsorption force with the magnetic body 30. Combined permanent magnet 3 It is to be able to be removed with. Further, as shown in FIG. 5, a pair of through holes having different diameters with a large diameter on the front surface side and a small diameter on the back surface side are provided in the thickness direction of the transparent panel 12, and the back surface side small diameter through holes are permanently provided. By arranging the magnet 31 as the iron piece in the through hole having a large diameter on the surface side, and arranging the ferromagnetic cover member 32 similarly bonded to the step portion in the thickness direction by the pair of through holes having different diameters, The cover member 32 is prevented from projecting from the transparent panel 12 to the surface, and the transparent panel 12 is similarly removed together with the permanent magnet 31 by utilizing the gap with the cover member 32 having a large-diameter through hole. You can also. In the example of FIG. 5, if the permanent magnet 31 is fitted and bonded to the through hole having a small diameter on the back surface side, the cover member 32 is fitted into the through hole having a large surface side diameter without bonding this. It is possible to dispose the transparent panel 12 together with the permanent magnet 31.

  On the other hand, the holding frame 20 is made of a metal having a U-shaped cross-section with an upward opening, for example, by bending a metal plate such as an aluminum plate or a coated iron plate or by polymerizing and bonding the bottom of the L-shaped material. In the present example, the holding frame 20 is provided with, for example, the heights of the wall surfaces on the front and back sides. Is formed in a U-shape having a different height so that it is low at the front and high at the back, thereby ensuring a smart appearance as the display device A by regulating the height of the front and making the surface area as much as possible. As an enlargement.

  The LED unit 21 uses a strip-shaped substrate in which a number of high-brightness LED chips are arranged in series in the longitudinal direction, and is adhered to the bottom wall of the holding frame 20, that is, the bottom surface of the inner groove, and fixed. The LED chips are arranged as densely as possible over substantially the entire length of the holding frame 20 so as to supply the light guide panel 10 with incident light with as high brightness as possible. The LED unit 21 is bonded with a heat conductive double-sided tape or an adhesive, in this example, a double-sided tape. As a result, the LED unit 21 is fixed to the metal, particularly the metal holding frame 20 whose surface area is increased as much as possible. It is assumed that the heat generation of the luminance LED chip is radiated as effectively and appropriately as possible to eliminate the deterioration of the LED chip due to the heat generation and to ensure its durability.

  The back panel 14 having the light guide panel 10 and the light diffusing material 11 and the reflective material 13 laminated on the light guide panel 10 adhered and held in this example has fixing through holes at the same positions at both ends in the width direction. The light guide panel 10, the light diffusing material 11, and the through holes are penetrated by the penetration of the support legs 22 by making the positions and diameters of the through holes match the through holes of the holding frame. The rear panel 14 is floated from the LED chip and is integrally supported by the holding frame 20 to form the display device A.

  In this example, the support leg 22 is constituted by a pair of bolts and nuts including, for example, a bolt 23 disposed at the tip of the base and a nut 24 screwed to the bolt 23, and maintains the base and the nut diameter. The diameter of the hole is larger than that of the through hole of the frame 20 and the diameter of the bolt 23 is adjusted to be smaller than that of the through hole of the holding frame 20 and the light guide panel 10. Inserted through the light guide panel 10, the light diffusing material 11, and the back panel 14, which is inserted into the inner frame of the holding frame 20, and the lower end partly inserted into the inner groove of the holding frame 20. The bolt 23 is projected to the front side through the through-holes, and nuts 24 are screwed onto the projected bolt 23, so that the light guide panel 10, the light diffusing material 11 and the rear panel 14 are mounted at both ends in the width direction. , Floating above the holding frame 20 And support, there is as performing the integral support. In this example, the pair of support legs 22 are arranged so as to be orthogonal to the holding frame 20, while the length of the support legs 22 is controlled to change the holding frame 20 from the vertical state to the rear side. The display device A is installed in a tilted state, and the back tilt angle toward the back side in the display device A of this example is set to be about 75 to 80 degrees with respect to the horizontal plane. It is assumed that it is placed on a counter or table to ensure an easy-to-see angle.

  At this time, the holding frame 20 has a U-shaped cross section, and its inner width is larger than the total thickness of the light diffusing material 11, the light guide panel 10, the reflecting material 13, and the back panel 14. , A gap due to a dimensional difference between the internal width and the total thickness is formed during the integral support. The light diffusing material 11, the light guide panel 10, the reflecting material 13, and the back panel 14 can be left as an integral unit by bonding, for example, but in this example, the light diffusion of the holding frame 20 is possible. A spacer 25 for heat conduction made of metal such as aluminum or iron is interposed between the material 11 and the back panel 14, thereby making the holding frame 20 a heat radiating means and the LED unit 21. By conducting heat generation to the metal back panel 14 through the holding frame 20 and the heat conducting spacer 25, the back panel 14 can be used as a heat dissipating means with a larger area to ensure a quick heat dissipating function. Can be.

  On the other hand, since the lower end of the transparent panel 12 is shorter than the light guide panel 10 and the light diffusing material 11, the transparent panel 12 is in a floating support state with respect to the holding frame 20 of the light diffusing material 11 and the light guide panel 10. The lower end of the transparent panel 12 is located on the front side wall surface of the holding frame 20 without hitting the holding frame 20, covers the effective area of the back illumination in the light guide panel 10, and the light diffusing material 11 The permanent magnet 31 can be attached to and detached from the front.

  Since both ends in the lower longitudinal direction of the holding frame 20 are open and the LED unit 21 in the holding frame 20 can be seen from the side surface, for example, resin hole closings are disposed at both ends of the lower part, if necessary. Further, by extending the wall surface on the front side of the holding frame 20 and bending it to the back side, both ends of the holding frame 20 can be closed to improve the appearance.

  FIG. 6 shows another example. In this example, the back surface of the light guide panel 10 is provided with a reflecting material 11 and a metal back panel 14 on the back surface, and the holding frame 20 is attached to the back surface. In this example, the back panel 14 is integrally or integrally formed with the back panel 14. In this example, the back panel 14 is also made of metal such as aluminum or painted iron plate, Similarly, a holding frame 20 having a U-shaped cross section formed by bending aluminum, a coated iron plate or the like is arranged so as to overlap with the lower end of the back panel 14. At this time, in this example, the holding frame 20 narrows the opening upward so that the upper part is narrowed inward, and the opening width is reduced to the light guide panel 10, the light diffusing material 11, the reflecting material 13, and the back panel 14. By making the width approximate to the total thickness of these, a gap is prevented from being generated in the holding frame 20 in the floating support state. In this example, since the holding frame 20 is formed integrally or integrally with the back panel 14, the heat generated by the LED unit 21 is conducted to the back panel 14 through the holding frame 20 in the same manner as described above. The rear panel 20 together with the holding frame 20 can be used as heat dissipation means to ensure a quick heat dissipation function. The rest of the configuration is the same as in the above example, so the same reference numerals are assigned and duplicate descriptions are omitted.

  FIG. 7 shows still another example. In this example, the reflector 13 and the back panel 14 are similarly arranged on the back surface of the light guide panel 10, and the holding frame 20 is disposed below the back panel 14. The light guide panel 10 is integrally or integrally arranged in the present example, and the light guide panel 10 is connected to the holding frame 20 via support spacers 26 at a plurality of positions in the longitudinal direction of the holding frame slightly higher than the LED chip. In this example, the holding frame 20, for example, the holding frame 20 having a U-shaped cross section, is partially overlapped with the lower end of the back panel 14 on the rear wall surface. Then, for example, a double-sided tape or an adhesive, in this example, the same as the above-mentioned bonding of the LED unit 21, these are bonded by a heat-conductive double-sided tape or a heat-conductive adhesive, and the integrated arrangement is performed. And again A pair of spacers 26 are arranged at both ends in the longitudinal direction of the holding frame 20 using a support spacer 26 made of synthetic resin, metal, etc., which is about 1 mm higher than the height of the LED chip. The light guide panel 10, the light diffusing material 11, the reflective material 13, and the back panel 14 are placed or fixed and placed to be supported.

  The support spacers 26 of this example are paired at both ends in the longitudinal direction of the holding frame 20 in which the LED units 21 are arranged in series, for example, but if necessary, that is, when the weight of the integrated unit is increased or the display device A When the width is large, a support spacer 26 is appropriately added between the LED units 21 to perform stable support. When the opening of the holding frame 20 is narrowed, the arrangement of the integrated unit can be used as the display device A by placing it on the support spacer 26. When the unit is wider than the unit, for example, the support spacer 26 may have a U-shaped cross section, and the lower ends thereof may be fitted into the grooves or may be fixed by bonding them.

  At this time, the light guide panel 10 and the light diffusing material 11, the reflecting material 13, and the back panel 14 stacked on the light guide panel 10 are integrated as a unit or between the wall surface of the holding frame 20 and the light reflecting material 11 and the back panel. For example, an appropriate presser bar is interposed between the two and the like, so that the displacement is prevented.

  Note that the back support legs (not shown) are fixed by, for example, the back panel 14 or the hinges of the holding frame 20 without penetrating the holding frame 20, or from the back panel 14 or the holding frame 20 to the tips of the support legs. The display device A is similarly maintained in a backward tilted state by fixing by screwing screws.

  Even in this example, it is possible to secure a quick heat dissipation function in the same manner as described above, using the rear panel 14 together with the holding frame 20 as heat dissipation means. Since the remainder is not different from the above example, the same reference numerals are assigned and redundant description is omitted.

  The display device A configured as described above can be easily configured with as few parts as possible and can be supplied to the market as low cost as possible. The transparent panel 12 can be removed and the light transmissive film can be easily replaced, and the heat generated by using the high-luminance LED chip of the LED unit 21 can be effectively radiated to prevent deterioration of the LED chip. And can be made durable. In the example of FIGS. 1 to 5 and FIG. 6, the display device A is an assembly type with the support leg 22 removed, and the display device A with the support leg fixed by the hinge of FIG. Without being done, each can be packed and shipped compactly as an assembly type. In each of the above examples, the side face is exposed as a finished product without disposing an outer frame on the outer periphery of the light guide panel 10 or the like, so that the side face of the light guide panel 10 has a light guide function. The transparent panel 12 is made of a transparent resin, but does not have a light guide pattern, so there is no brightness on the side end face, and thus the exposed side face makes the light guide panel 10 shining bright and transparent. The panel 12, the light diffusing material 11, the reflecting material 13, and the back panel 14 are sandwiched to generate a light / dark difference, and the light / dark difference can be used as a design element.

  Although the illustrated example is as described above, the transparent panel is installed so as to sandwich the transparent panel by placing a permanent magnet on the surface of the transparent panel, and the pair of support legs are provided as necessary. In addition to increasing the number of support legs by adding them between the pair of support legs, and arranging the reflective material on the back panel, etc. Light panel, light diffusing material, transparent panel, light transmissive film, LED unit, LED chip, ferromagnetic material, permanent magnet, holding frame, support leg, spacer, etc. Additions to these may take various forms as long as they do not contradict the gist of the invention.

It is a partially cutaway perspective view of a display apparatus. It is a longitudinal cross-sectional view of a display apparatus. It is a partially cutaway front view of a display apparatus. It is an expanded longitudinal cross-sectional view of the permanent magnet part of a transparent panel. It is an expanded longitudinal cross-sectional view which shows the other example of the permanent magnet part of a transparent panel. It is a longitudinal cross-sectional view of the display apparatus concerning another example. It is a partially cutaway front view of the display apparatus concerning another example.

Explanation of symbols

A Display device 10 Light guide panel 11 Light diffusing material 12 Transparent panel 13 Reflecting material 14 Back panel
20 Metal Holding Frame 21 LED Unit 22 Support Leg 23 Bolt 24 Nut 25 Heat Conducting Spacer 26 Support Spacer 30 Magnetic Body 31 Permanent Magnet 32 Cover Member

Claims (4)

  A display device having a simple configuration in which a light diffusing material arranged in front of a light guide panel and a light transmissive film between the transparent panels in front of the light guide panel are back illuminated by LED units arranged in series with LED chips, By placing a magnetic material on the diffuser and a permanent magnet on the transparent panel corresponding to the position of the magnetic material, the transparent panel can be freely attached to and detached from the light guide panel, and the metal upward opening disposed below the light guide panel is retained. The LED unit is adhered to the frame with a thermally conductive double-sided tape or a thermally conductive adhesive with the LED chip facing upward, and the holding frame is used as a heat radiating means. The light guide panel is placed on the LED chip by passing through a plurality of support legs that are arranged at a plurality of locations in the longitudinal direction of the support frame and stand upright at a predetermined angle. Simple display device for backlighting, characterized in that formed by float support.   The simple display device for back lighting according to claim 1, comprising a reflective material or a reflective material and a back panel on a back surface of the light guide panel.   2. The light guide panel according to claim 1, further comprising a reflective material and a metal back panel on the back surface of the light guide panel, and the holding frame is integrally or integrally disposed with the back panel. Simple display device for back lighting.   A display device having a simple configuration in which a light diffusing material arranged in front of a light guide panel and a light transmissive film between the transparent panels in front of the light guide panel are back illuminated by LED units arranged in series with LED chips, By arranging a magnetic material in the diffuser and a permanent magnet in the transparent panel corresponding to the magnetic material position, the transparent panel can be attached to and detached from the light guide panel, and a reflector and a back panel are placed on the back of the light guide panel. At the same time, the LED unit is bonded to the holding frame of the metal upward opening integrally or integrally disposed below the back panel with the LED chip facing upward by using a heat conductive double-sided tape or a heat conductive adhesive. The light guide panel is attached to the holding frame through support spacers at a plurality of positions in the longitudinal direction of the holding frame slightly higher than the LED chip. Serial simple display device for backlighting, characterized by comprising supporting floated from the LED chip.

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