JP2010256813A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate replacement of an LED light source of a display device. <P>SOLUTION: In a display device A, a panel support substrate 3, a reflecting sheet 2, a light guide panel 1, and a light diffusing sheet 6 are laminated, and an attachment/detachment frame 4 which has an L-shaped cross-section and has an LED unit 5 bonded to a standing piece 41 thereof is disposed on an incidence end surface of the light guide panel 1, and a transparent resin cover 7 is laminated on a surface of the light diffusing sheet 6, and a frame 8 is disposed so as to surround their outer peripheries, and screws 9 from a backside covering piece 83 of the frame 8 are engaged with nuts 11 of the light guide panel 1. The attachment/detachment frame 4 can be removed by removing the screws 9 and detaching the frame 8 on the incidence end surface side, so that the LED unit 5 can be easily and reliably replaced at the time of burning-out of an LED chip or the like. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display device used for backlighting a positive image film.

  As this type of display device, the present inventor has proposed, for example, a display device including a light guide panel and an LED light source provided adjacent to an incident end surface of the light guide panel. An LED unit in which a large number of LED chips are arranged in parallel is used, and this LED unit is bonded and fixed to, for example, the inner surface of an opposing upright piece standing from the bottom plate of a storage case that stores the light guide panel. The reflective sheet is arranged on the bottom surface of the storage case, and the storage case is fitted on the front side of the storage case, for example. The light diffusing case is used as a display device including large-sized ones for wall hangings, rooftop advertisements, and the like.

JP 2009-47916 A

  In this case, for example, as a display device suitable for displaying a timetable for a wall surface of a station building or a self-supporting frame, or for displaying an advertisement for a wall surface of an underground passage, a relatively thin and high-luminance backlight is provided. Can be performed.

  However, the LED light source has a long life and is considered to be durable. For example, there is a possibility that the ball may break due to long-term use, and when troubles caused by the LED light source occur including this case. However, there is a problem that the maintenance work becomes complicated.

  That is, the LED light source is adhered and fixed to the standing piece of the storage case containing the light guide panel, and is disposed adjacent to the incident end face of the light guide panel. It is practically impossible to remove the existing LED light source and fix the new LED light source, or it is extremely troublesome. The display device including removal must be accompanied by the same troublesome disassembly work, and therefore, it is necessary to eliminate such trouble of maintenance work caused by trouble of the LED light source in particular. Arise.

  The present invention has been made in view of such circumstances, and a problem to be solved by the invention is to provide a display device capable of performing maintenance work caused by the trouble of the LED light source as easily and reliably as possible. is there.

  In accordance with the above-described problems, the present invention is configured such that the LED light source is L-shaped or U-shaped in cross section and the lower surface is also used as a heat sink without using a storage case that is erected on the incident end surface by fixing the LED light source to the upright piece. The detachable frame can be attached to and detached from the light guide panel by fixing the detachable frame to the light guide panel, and the LED light source is fixed to the detachable frame. A display device comprising the light guide panel and an LED light source provided adjacent to the incident end face of the light guide panel. The LED light source is installed in a detachable frame having an L-shaped section or a U-shaped cross section, the surface of which is detachable with respect to the light guide panel and the lower surface is a fixing piece that also serves as a heat sink. It is obtained by a display device to.

  In addition to the above, the invention described in claim 2 is provided with a frame that is separable from the detachable frame that covers the end portion of the light guide panel and the detachable frame or its LED light source on the front side. In order to ensure a good appearance of the display device and ease of maintenance work, it is superposed on the lower surface of the detachable frame and has a frame that is separable from the detachable frame. The display device according to claim 1 is provided.

  In addition to the above, the invention described in claim 3 has a U-shaped cross section of the detachable frame so that it can also be used as a frame of the display device to ensure a good appearance with as few members as possible. The display device according to claim 1, wherein the detachable frame has a U-shaped cross section and is also used as a frame.

  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 invention according to claim 1 is an upright piece of a detachable frame in which the LED light source has an L-shaped cross section or a U-shaped cross section and the lower surface is a fixing piece that also serves as a heat sink. By fixing, the detachable frame can be freely attached to and detached from the light guide panel, and by fixing the LED light source to the detachable frame, the detachable frame can be removed from the light guide panel and the maintenance work can be performed. It is possible to provide a display device that can perform maintenance work due to the trouble of the LED light source as easily and reliably as possible.

  In addition to the above, the invention described in claim 2 is provided with a frame that is separable from the detachable frame that covers the end portion of the light guide panel and the detachable frame or its LED light source on the front side. It is possible to ensure a good appearance of the display device and ease of maintenance work.

  In addition to the above, the invention described in claim 3 has a U-shaped cross section of the detachable frame so that it can also be used as a frame of the display device to ensure a good appearance with as few members as possible. It can be.

It is a cross-sectional view of a display device. It is a longitudinal cross-sectional view of a display apparatus. It is a cross-sectional view of a display device according to another example. It is a cross-sectional view of a display device according to still another example.

  Hereinafter, the present invention will be described in more detail with reference to examples of the drawings. In FIGS. 1 and 2, A is a display device, and the display device A includes a light guide panel 1 and an incident end face of the light guide panel 1. In this case, the LED light source 5 has an L-shaped cross section in which the LED light source 5 is detachable from the light guide panel 1 and the lower surface is a fixing piece 42 serving also as a heat sink. In this example, the display device A is provided with a frame 8 that overlaps with the detachable frame 4 and is separable from the detachable frame 4. As a thing.

  That is, the display device A of the present example is, for example, an outdoor building wall or outdoor installation for advertisement or decoration by making a rectangle or a rectangle having a side or length of 1 to 2 m or more from A2 size. As an electric decoration for a wall-mounted large plate that is posted on a bulletin board or the like, the light guide panel 1, the reflective sheet 2 disposed on the back surface of the light guide panel 1, and the display device A on the back surface of the reflective sheet 2 A panel support substrate 3 arranged to form a substrate, a detachable frame 4 having an L-shaped cross section in the present example, arranged so as to superpose a fixing piece 42 on the back surface of the panel support substrate 3, and the light guide panel 1 is laminated in front of the light diffusing sheet 6, the transparent resin cover 7 is detachably disposed on the front side of the light diffusing sheet 6, and the fixing piece 42 of the detachable frame 4 and the outer periphery of the transparent resin cover 7 are enclosed. Arranged to cover the light guide panel And fixed by a screw 9 so as to reach, there as having a U-shaped section of the frame 8 in the present embodiment.

  The light guide panel 1 is a panel in which a light guide pattern whose density is changed is arranged on the back surface of a transparent plate such as an acrylic resin, and the density change of the light guide pattern is peaked at the center in the width direction. The brightness of the light source panel 1 is assured to be as high as possible by the incident light from the LED light source 5, which is increased from both ends in the width direction, and incident from the LED light sources 5 arranged on the incident end faces disposed at both ends in the width direction. A positive image film (not shown) disposed through the light diffusion sheet 6 is illuminated from the back surface thereof to illuminate the positive image film. At this time, the light guide panel 1 is disposed at an outer peripheral end portion thereof. A nut 11 into which the screw 9 is screwed, and in this example, a screw insert using a coil (trade name Helisart) is inserted and disposed. By inserting the nut 11, a transparent plate such as an acrylic resin is used. Light guide It is as may make screwing robust screw 9 against panel 1.

  The reflective sheet 2 has the same area as the light guide panel 1 and is guided using a highly reflective film such as a white foamed polyester sheet so as to prevent light guide loss of the light guide panel 1 as much as possible. The back surface of the panel 1 is covered and the through holes of the screws 9 are provided at the same position as the light guide panel 1. The panel support substrate 3 has the same area as that of the light guide panel 1. Resin or metal made by superposing on the back side to support the light guide panel 1 and bonding and fixing the outer peripheral end of the reflection sheet 2 to the front side as necessary, and through the through holes of the screws 9, this example In this case, for example, it is made of aluminum so as to make the heat radiation of the fixing piece 42 of the detachable frame 4 more effective.

  The detachable frame 4 includes an upright piece 41 that faces the incident end face of the LED light source 5 and the fixing piece 42 that also serves as the heat sink, which is formed by bending the upright piece 41 toward the back surface of the light guide panel 1. The metal plate is made of a metal having a relatively high thermal conductivity and has the same length as the incident end face of the light guide panel 1 and the through hole of the screw 9 is provided in the fixing piece 42. The standing piece 41 of the detachable frame 4 has a height that is somewhat higher than the thickness of the light guide panel 1, for example, a little over 1 cm, and the fixing piece 42 is configured so that the heat radiation of the LED light source 5 can be favorably performed. 8 cm or more, for example, a width of about 10 cm to 20 cm.

  The LED light source 5 uses an LED unit in which a large number of high-brightness LED chips are embedded in a base at as small a pitch as possible, and the base of the LED unit is placed on the upright piece 41 of the detachable frame 4, for example, heat dissipation. By adhering with the double-sided tape or adhesive, the upright piece 41 is installed so as to cover substantially the entire length, and the incident light of the LED chip is supplied to the entire length of the incident end surface of the light guide panel 1 in the longitudinal direction. is there.

  The light diffusion sheet 6 uses a prism lens having the same area as the light guide panel 1 or a semi-transparent resin sheet having a roughened surface, and its outer peripheral edge is adhered and fixed to the front side of the light guide panel 1 as necessary. And integrated with the light guide panel 1.

  The transparent resin cover 7 has a same area as the light guide panel 1 and uses a transparent panel made of polycarbonate, acrylic, or the like. The display device A is arranged so as to be slidable and detachable from the display device A with the optional picture frame 8 removed, and the display device A or its positive film is protected in the front.

  The frame 8 includes an upright piece 81 and front and back side covering pieces 82 and 83 that are bent from both ends in the width direction toward the light guide panel 1 side. It is provided with two for the vertical covering the incident end face side end and two for the horizontal covering the end face intersecting with the incident end face, each of which cuts off the end in the longitudinal direction. The two lengths are shortened by the vertical width so that the ends are in contact with each other in the state of being arranged on the light guide panel 1, and the through holes of the screws 9 are similarly formed in the back surface side covering piece 83. The frame 8 in this example is made of a transparent synthetic resin or metal. At this time, the height of the upright piece 81 is set to the height of the upright piece of the detachable frame 4 and the thickness of the transparent resin cover 7 is set. Depending on the added dimension, the width is set to about 1.5 cm, and the widths of the front and back side covering pieces 82 and 83 are several. m or less, for example, as was 2cm approximately.

  Each member formed in this manner includes a panel support substrate 3, a reflection sheet 2, a light guide panel 1 with the light guide panel 1 to the light diffusion sheet 6, and a fixed piece 42 superimposed on the panel support substrate 3. The detachable frame 4 is arranged on the incident end face side of the light guide panel 1 so that the LED light source 5 is provided on the incident end face, while the transparent resin is provided on the surface of the light guide panel 1 to the light diffusion sheet 6. In the state where the cover 7 is arranged, the frame 8 is arranged so that the front and back ends are fitted by the front and back side covering pieces 82 and 83, and the through-hole of the back side covering piece 83 is inserted into the detachable frame 4. A screw 9 is screwed into the nut 11 of the light guide panel 1 through the fixing piece 42, the panel support substrate 3, and the reflection sheet 2, and these are integrated to complete the display device A. . At this time, the display device A of this example can be shipped as the finished product, but the transparent resin cover 7 and the frame 8 are further separated from the display device A, and the fixing piece 42 of the detachable frame 4 is transparent. The screw 9 is screwed into the nut 11 of the light guide panel 1 through the hole, so that the detachable frame 4, the panel support substrate 3, the reflection sheet 2, the light guide panel 1 to the light diffusion sheet 6 are shipped together. These can be installed at the installation site to make a finished product.

  3 and 4 show other examples. FIG. 3 shows an example in which the light guide panel 1 is thickened and the LED light sources 5 are arranged in parallel in the width direction with respect to the wide incident end face. Yes, in this example, the light guide panel 1 is, for example, less than 2 cm, and two rows of LED light sources 5 are arranged in parallel in the width direction. In this example, the height of the standing piece 41 of the detachable frame 4 The remainder is the same as the above example, except that the dimensions such as the width of the fixed piece 42 and the height of the upright piece 81 of the frame 8 are changed to correspond to the thickness of the thickened light guide panel 1. Therefore, the same reference numerals are assigned and redundant description is omitted.

  FIG. 4 shows an example in which the basic configuration of the display device A is the same as that of the above example, but the detachable frame 4 is also used as a frame with a U-shaped cross section. A is the frame-attachable detachable frame 4 which is made up of an upright piece 41, a fixed piece 42 having a through-hole of the screw 9 in the same manner as described above at the back side end of the upright piece 41, and the upright piece 41. The surface 41 is provided with a surface-side covering piece 43 at the surface-side end portion of the piece 41 and, similarly to the frame 8, the vertical two covering the incident end surface side end portion and the side surface covering the end surface intersecting the incident end surface are provided. The panel support substrate 3 and the transparent resin cover 7 are provided by cutting off one end in the longitudinal direction, or shortening one of the ends in the width direction and bringing the ends into contact with each other. The outer periphery of the fixing piece 42 is arranged so as to cover the outer periphery, and the light guide path is passed through the through hole of the fixed piece 42. By fixing by screws 9 to reach the Le 1, it is set as the display device A by integrating them. At this time, in the present example, the surface side covering piece 43 has a short width, and the fixed piece 42 has a U-shaped cross section in which these are formed to have different widths. These frame-use detachable frames 4 have their longitudinal end portions cut off in the same manner as in the frame 8, or one of them is shortened by the width of the other and is in contact with each other. Similarly, since the remainder is not different from the above example, the same reference numerals are assigned and redundant description is omitted.

  In the display apparatus A configured as described above, the screws 9 are removed, and in the example shown in FIGS. 1 to 3, if the frame, particularly the frame 8 on the incident end face side is removed and detached, the detachable frame 4 is displayed. Since it can be temporarily removed from the device A, all or a part of the LED light source 5 of the detachable frame 4 can be replaced, and at this time, without a complicated disassembly work as in the conventional display device, The maintenance work can be performed as easily and reliably as possible, and in the example of FIG. 4, if the screw 9 is removed, the detachable frame 4 also serving as a frame can be temporarily removed. Similarly, replacement of all or part of the LED light source 5 can be performed as easily and reliably as possible. Furthermore, they can be made uniform and have high-luminance illumination while forming the whole as thin as possible. Usability to perform It can be a casting.

  Although the illustrated example is as described above, it is assumed that the LED light source of the display device of FIG. 4 is arranged in parallel in the width direction with respect to the incident end surface as in the example of FIG. Install a frame so that the frame has a U-shaped cross-section and cover it, install a bracket on the back, arrange a pair of light guide panels in the width direction, and supply incident light from one incident end surface on each side In addition to the implementation of the present invention, including the configuration of the display device, each of the display device, the light guide panel, the incident end face, the LED light source, the detachable frame, the frame used as necessary, the detachable frame also used as a frame, etc. The target shape, structure, material, relationship between these, addition to these, and the like can be in various forms without departing from the spirit of the invention.

A Display device 1 Light guide panel 11 Nut 2 Reflective sheet 3 Panel support substrate 4 Removable frame 41 Standing piece 42 Fixed piece 43 Surface side covering piece 5 LED light source 6 Light diffusion sheet 7 Transparent resin cover 8 Frame 81 Standing piece 82 Surface side covering Piece 83 back side covering piece 9 screw

Claims (3)

  A display device comprising a light guide panel and an LED light source disposed adjacent to an incident end face of the light guide panel, wherein the LED light source is detachable from the light guide panel, and the lower surface is a fixed piece that also serves as a heat sink A display device, wherein the display device is installed in a detachable frame having an L-shaped or U-shaped cross section.   The display device according to claim 1, further comprising a frame that overlaps with a bottom surface of the detachable frame and is separable from the detachable frame. The display device according to claim 1, wherein the detachable frame has a U-shaped cross section and also serves as a frame.

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