JP2005043756A - Display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display apparatus provided with light emitting elements like LED (light emitting diode), displaying letters, figures and signs, and displaying in colors different from the emitting light colors of the elements or varying display colors. <P>SOLUTION: This display apparatus comprises a board 2 having multiple LEDs 1, a light guide board 3 disposed in the front side of the light emitting direction from the LED 1, and a pair of fluorescent lamps 4, 4 injecting light into the light guide plate 3 from a side end face of the transparent light guide plate 3 positioned in a side of the light emitting direction of the LED 1. A conical recessed part 6 is formed in the board 2 side of the guide board 3, corresponding to the position of the LED 1. The recessed part 6 has a half-vertex angle of 45 degrees. Light L1 emitted from the LED 1 and light L2 from the fluorescent lamps 4 are additively mixed according to respective spectra, and display appears on the display sueface of the light guide board 3 with light L of a color different from original colors of light of the LED and fluorescent lamps. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a display device including a plurality of light emitting elements such as LEDs and capable of displaying characters, figures, symbols, and the like.

  As a display device configured to display characters by turning on and off a plurality of LEDs, etc., an acrylic plate or the like is provided on the front side of the substrate in which light emitting elements such as LEDs are arranged in a matrix or other desired form. A transparent plate is well known. In such a display device, various characters and the like can be displayed by turning on and off the LEDs in various modes. On the other hand, the display color of characters and the like is determined by the light emission color of the light emitting element as a light source. For this reason, there is no other way to display in a color different from the light emission color of the element by using a colored transparent plate or sticking a film material so as to exhibit a desired color. In order to change, it is necessary to previously provide LEDs having different emission colors and to switch elements that emit light during display. In any case, it is very inferior in terms of color change and multicoloring as compared with a liquid crystal display device or the like.

However, since the display device as described above can be configured at low cost, it is widely used in applications such as store display.
Japanese Patent Laid-Open No. 06-034818 JP 2001-256817 A

  Therefore, the present invention can be used alone or as a display device, and can be used in combination with a display device including a light emitting element such as an LED, and includes a light emitting element such as an LED to display characters, figures, symbols, and the like. In the case where a display device that can be used is configured, it is an object of the present invention to provide a display device that can display in a color different from the light emission color of the element and can change the display color during display.

  In order to achieve the above object, a display device according to claim 1 of the present invention includes a light guide plate and at least one light source arranged so that light can be incident into the light guide plate from a side end surface of the light guide plate. And a plurality of recesses are formed on the rear side of the light guide plate.

  According to the second aspect of the present invention, in order to achieve the above object, a surface light source body including a plurality of light emitting elements, a light guide plate disposed on the front side in an emission direction of light from the surface light source body, and the surface light source Comprising at least one light source arranged so that light can be incident into the light guide plate from the side end surface of the light guide plate located on the side of the light emission direction from the body, on the surface light source body side of the light guide plate A concave portion is formed in correspondence with the position of the plurality of light emitting elements of the surface light source body.

  In order to achieve the above object, according to the third aspect of the present invention, in the display device according to the first or second aspect, a color of light emitted by the light source is provided between the light source and a side end surface of the light guide plate. A filter material that can be changed is provided.

  In order to achieve the above object, the light source according to claim 4 is characterized in that, in the display device according to claim 1 or 2, the light source can change the color of the emitted light.

  According to the fifth aspect of the present invention, in order to achieve the above object, in the display device according to any one of the first to fourth aspects, a light shielding member is disposed on the surface of the surface light source body of the light guide plate, and the light shielding member. Has a non-light-shielding portion that can transmit light in correspondence with the position of the concave portion.

  In order to achieve the above object, according to the sixth aspect of the present invention, in the display device according to any one of the first to fourth aspects, a light-shielding body is provided on the surface side opposite to the surface of the surface light source body of the light guide plate. And a hole for arbitrarily transmitting the light of the light guide plate to the front side is formed in correspondence with the position of the concave portion of the light shielding body.

  According to the seventh aspect of the present invention, in order to achieve the above object, in the display device according to any one of the first to fifth aspects, the concave portion is conical or hemispherical.

  The display device according to claim 1 of the present invention can be used as a display device by itself by providing a light source disposed at the end of the light guide plate without providing a surface light source body made of a light emitting element or the like. In addition, it can be used in combination with a display device including a light emitting element such as an LED.

  The display device according to claim 2 of the present invention has a color different from that of the light emitting element due to a color mixture of the light emission color of the light emitting element constituting the surface light source body and the light emission color of the so-called edge light type light source at the end of the light guide plate. Characters, figures, symbols, etc. can be displayed.

  The display device according to claims 3 and 4 of the present invention enables various displays such as changing the display color during display by using a filter material or using a light source that can change the color of emitted light. It is.

  In the display device according to the fifth aspect of the present invention, the non-light-shielding portion of the light-shielding member can be used to clarify the boundary between the light-emitting portion and the light-shielding portion so that the light-emitting display content does not blur. Even if the surface light source body is turned off, the same display can be performed by the light source at the end of the light guide plate.

  In the display device according to claim 6 of the present invention, the light-emitting display content is more clearly prevented from blurring by using the light shielding body, or the specific display content is clearly clarified by arbitrarily drilling a hole in the light shielding body. It is possible to display.

  The display device according to claim 7 of the present invention can efficiently perform light emission display and color mixing.

  The best mode for carrying out the present invention will be described below with reference to the embodiments shown in the drawings.

  FIG. 1 is an exploded perspective view (A) and a sectional view (B) showing an embodiment of a display device according to the present invention, and FIG. The display device according to the present embodiment mainly includes a board 2 which is a surface light source body including a plurality of LEDs 1 as light emitting elements, a light guide plate 3 disposed on the front side in the light emission direction from the LEDs 1, and the light from the LEDs 1. The light guide plate 3 includes a pair of fluorescent lamps 4 and 4 arranged as a light source capable of allowing light to enter the light guide plate 3 from the side end face of the light guide plate 3 located on the side in the emission direction.

  The power source of the LED 1 and the fluorescent lamp 4 may be a commercial power source, or a dedicated power source may be prepared, but illustration is omitted. Also, various control means such as a light emission drive control circuit may be employed, and illustration and description thereof are omitted. Further, the board 2, the light guide plate 3 and the like are configured as, for example, a billboard-like advertising device or the like by an appropriate support, and the illustration and description thereof are omitted because they are well known.

  For example, the board 2 is configured by arranging a large number of LEDs 1 on one side in a matrix or so as to display a specific character or figure to be displayed. In the illustrated example, the board 2 includes a large number of rows and columns. Although arranged in a matrix, the arrangement of light emitting elements such as the LED 1 in the present invention is not limited to the illustrated example. Further, the light emitting element is not limited to the LED, and various similar elements can be employed. Further, in the following description, the case where the light emission colors of the plurality of LEDs are the same will be described, but it is of course possible to arrange the LEDs of a plurality of colors as appropriate.

  An annular light shielding member 5 is provided on the outer periphery of the LED 1 so as to direct the emitted light toward the light guide plate 3 as much as possible. As a result, it is possible to display with less brightness and with a suitable contrast with the brightness of the surface of the light guide plate 3 to be described later.

  The light guide plate 3 is a transparent member made of a synthetic resin such as acrylic, for example, and a large number of conical recesses 6 are formed on the board 2 side so as to correspond to the positions of a large number of LEDs 1. The recess 6 has a half apex angle of 45 degrees. Any method may be used for forming the recess 6 in the material such as synthetic resin, but it is preferable to finish the surface thereof, that is, the inner surface of the recess 6 in a mirror shape. Further, the recess 6 may be formed in a hemispherical shape.

  Further, a light shielding member 8 is attached to the light guide plate 3 on the board 2 side as a non-light shielding portion 7 with a corresponding position with the recess 6. The function of the light shielding member 8 is to shield the light emitted from the LED 1 on the front side of the light guide plate 1 other than the recess 6 and to reflect the light emitted from the fluorescent lamp 4 to the front side of the light guide plate 1. is there. In addition, as this light-shielding member 8, for example, a film material in which the opening portion of the recess 6 is opened, or a matte coating applied while leaving the opening portion of the recess 6 can be employed. This light-shielding member 8 also enables display with little contrast with the brightness of the display-side surface of the light guide plate 3 and appropriate contrast.

  The fluorescent lamp 4 introduces light into the light guide plate 3 by a so-called edge light system, and of course, means other than the fluorescent lamp can be used. A filter material 9 for changing the color of light emitted from the fluorescent lamp 4 is provided between the fluorescent lamp 4 and the side end face of the light guide plate 3. If the light source other than the fluorescent lamp can change the color of the emitted light by itself, the same effect can be achieved without providing the filter material 9.

  In the present embodiment, of the light emitted from the LED 1, the light that has entered the recess 6 is emitted from the display surface side of the light guide plate 3 to the outside through the light guide plate 3 (emitted light L <b> 1). The LED 1 may have a wide directivity, but if a narrow directivity LED is used, most of the light emitted from the LED follows this path. Further, the light refracted in the direction that does not go straight to the outside on the inner peripheral surface of the concave portion 6 is repeatedly reflected and attenuated in the light guide plate 3, or is emitted to the outside of the light guide plate 3 from a position away from the emission part by the straight advance. However, since the amount of light can be reduced, the degree of blurring of the display by the emitted light L1 is not so large. On the other hand, the light from the fluorescent lamp 4 enters the light guide plate 3 from the side end face of the light guide plate 3, that is, the edge, is reflected by the surface of the concave portion 6, and is emitted to the outside from the display surface side of the light guide plate 3. Light L2).

  The emitted lights 1 and 2 are additively mixed according to their spectrum, and the display surface of the light guide plate 3 is displayed with light (display light L) of a color different from that of the original LED or fluorescent lamp. Done. Therefore, according to the desired display content, for example, as shown in FIG. 1A, the LED 1 can be selectively turned on and off so as to display a character 10 or the like. Of course, by combining the LED 1 with a color filter, changing the type of the filter material 9 combined with the fluorescent lamp 4, or using a light source that can change the color of emitted light instead of the fluorescent lamp 4, the light guide plate 3. The display light L appearing on the surface can be set to a desired color. In the figure, the light spot is drawn on the display surface of the light guide plate 3 so that the light spot also appears on the portion not constituting the character 10 or the like. However, these are for explanation, and the light guide corresponding to the LED 1 that is turned off is shown. A light spot by the LED 1 does not appear at a portion of the display surface of the light plate 3.

  Further, light emitted from the fluorescent lamp 4 that does not mix with the emitted light L1 from the LED 1 brightens the display surface of the light guide plate 3 at a low luminous intensity. That is, in this type of conventional display device, the portion that does not correspond to the light source such as the LED that is lit is often the color of the light guide plate 3 itself or the color of the filter material 9 on the attachment surface side. However, in this example, the transparent light guide plate 3 is entirely lightly lit by the light from the fluorescent lamp 4, and this is the background color as a display device. Therefore, the background color of the light guide plate 3 can be changed to a desired color by changing the type of the filter material 9 combined with the fluorescent lamp 4 or using a light source that can change the color of the emitted light by itself instead of the fluorescent lamp 4. can do.

  On the other hand, when only the fluorescent lamps 4 and 4 are turned on with all the LEDs 1 turned off, the light incident on the light guide plate 3 is emitted outside the light guide plate 3 as the emitted light L2 in the same manner as described above. The entire display surface becomes brighter. Although the emitted light L2 is not so intense, one surface can be brightened with a color obtained by the filter material 9.

  In any of the above cases, the color change by the filter material 9 or the light emission color change of the light source is performed over time, so that the display color of the entire light guide plate 3 is changed over time, so that an interesting display is achieved. It becomes possible to do.

  Further, by attaching a light shielding material provided with a light shielding part and a non-light shielding part by a matrix opening on the display surface side of the light guide plate 3, the same light emission display can be performed even when there is no light emitting element such as an LED or when it cannot be used.

  Further, the light guide plate 3 is formed on the front side of the light guide plate 3, for example, in the form of a film or a sheet. The light corresponding to the light L <b> 1 emitted straight from the LED 1, i. You may make it arrange | position the light-shielding body 11 which perforated the hole 12 made possible. Thereby, the LED corresponding portion on the surface of the display device, that is, the concave portion 6 corresponding portion is clarified, and the light emission of only the LED 1 and the mixed color of the light of the LED 1 and the fluorescent lamp 4 become possible. The light shield 11 may be disposed on the front side of the light guide plate 3 in a non-contact manner, or may be attached to the front side of the light guide plate 3 as shown in FIG. Furthermore, the holes 12 do not have to be drilled at all of the matrix-like LED-corresponding positions, and may be drilled only at arbitrary positions so as to form a certain character.

1A and 1B are an exploded perspective view (A) and a cross-sectional view (B) showing an embodiment of a display device according to the present invention. It is a principal part expanded sectional view of embodiment of FIG.

Explanation of symbols

1: LED
2: Board 3: Light guide plate 4: Fluorescent lamp 5: Light shielding member 6: Recess 7 of the light guide plate: Non-light shielding portion 8: Light shielding member 9: Filter material L1, L2: Emission light 10: Characters to be displayed 11: Light shielding body 12: Hole

Claims (7)

It comprises a light guide plate and at least one light source arranged so that light can enter the light guide plate from a side end surface of the light guide plate, and a plurality of recesses are formed on the rear surface side of the light guide plate. Display device. A surface light source body having a plurality of light emitting elements, a light guide plate disposed on the front side in the direction of light emission from the surface light source body, and the side of the light guide plate located on the side in the direction of light emission from the surface light source body The light source plate includes at least one light source arranged so that light can be incident on the light guide plate, and the light source plate has a surface light source body side corresponding to the plurality of light emitting elements of the surface light source body. A display device comprising a recess. 3. The display device according to claim 1, wherein a filter material capable of changing a color of light emitted from the light source is disposed between the light source and a side end surface of the light guide plate. 3. The display device according to claim 1, wherein the light source is capable of changing a color of emitted light. 5. The display device according to claim 1, wherein a light shielding member is disposed on a surface of the surface light source body of the light guide plate, and a non-light shielding portion through which the light shielding member can transmit corresponds to the position of the recess. A display device comprising: 5. The display device according to claim 1, wherein a light-shielding body is disposed on the surface side of the light guide plate opposite to the surface of the surface light source body, and is arbitrarily arranged in accordance with the position of the concave portion of the light-shielding body. A display device characterized in that a hole for transmitting light of the light guide plate to the front side is provided in the front. 7. The display device according to claim 1, wherein the recess is conical or hemispherical.
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