JP5075001B2 - Internal illumination display device - Google Patents

Description

  The present invention relates to an internal display device that uses an LED (light-emitting diode) as a light source.

  2. Description of the Related Art Conventionally, it is known to use an LED with low power consumption and a long life instead of a fluorescent lamp or a fluorescent tube as a light source of an internal illumination display device represented by an internal illumination signboard. There are many signboards of two colors, white and red, white and blue, and single color LED modules such as red and blue, and LED modules using white LEDs are used.

Patent Document 1 discloses an internally illuminated signboard capable of displaying various colors by the light of a white LED that passes through a color sheet.
JP 2003-186428 A

  However, the white LED is mainly a pseudo-white LED using a combination of a blue LED chip and a yellow phosphor, and the color rendering property is poor because a specific wavelength is missing, and it is particularly dull when displaying white. It was a problem to look. In addition, when white LEDs composed of red, green, and blue LEDs are used, there is a problem that although the wavelengths of all three primary colors exist, the color looks different due to individual differences of the white LEDs.

  Accordingly, an object of the present invention is to provide an internal illumination display device that compensates for missing wavelengths and emits light with high color rendering properties as a whole and can display clearly.

The present invention is to transmit visible light, has a configured display panel portion of a plurality of colors, the white LED that emits white light, irradiated with light to be transmitted through the display panel from the rear side of the display panel The LED module is arranged on the back side of the display panel, and is composed of the same color or the same color as the hue of the portion at the corresponding position of the display panel, and is emitted from the LED module and reflected back to the display panel. and a reflector for emitting towards the further light reflected by secondary wavelength light the display panel, the UchiTeru display device including the display panel, colorless or white and the other the other color and the It is composed of two hues, and the reflection plate is composed of the same color or the same hue as the other hue .

  According to the present invention, the white light emitted from the LED module is reflected by the reflecting plate, so that the light of the wavelength corresponding to the hue of the reflecting plate is emitted and the colored portion of the display panel is required to emit light clearly. Supplement the light of the wavelength. Therefore, the LED module and the reflection plate as a whole emit light with high color rendering properties, and the display panel can be displayed clearly.

  Hereinafter, an internal illumination display device 100 according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view of an internal illumination display device 100 according to an embodiment of the present invention. The internal illumination display device 100 includes a display unit 10 that displays information such as a symbol mark and a logo, and a column 12 that holds the display unit 10.

  The support column 12 is provided to support the display unit 10, and there may be two cases or one case as in the present embodiment. Moreover, the column 12 may not be provided depending on the embodiment as in the case of being attached to the wall of the store. The inside of the column 12 is hollow, and a wiring (not shown) for supplying power to the display unit 10 is provided inside the column 12.

  2A is a front view of the display unit 10, and FIG. 2B is a cross-sectional view of the side surface of the display unit 10. FIG. 2A shows a state in which the display panel 11 is removed in order to explain the internal structure.

  The display unit 10 includes an LED assembly 120 in which a large number of LED modules 20 that emit light from the inside to the outside of the internal illumination display device 100 are arranged in a matrix, and a part of visible light is provided on the outside thereof. A display panel 11 that displays a symbol mark, a logo, and the like through the screen is provided. The display unit 10 maintains a shape as one rigid body by the case 13 and is fixed to the support column 12 through the case 13.

  The case 13 is a box frame type surrounded by four directions, and the remaining two opposing surfaces are open. The LED assembly 120 is fixed to the inside so as to emit light outward from the opening surface. In addition, the display panel 11 having substantially the same size as the LED assembly 120 is provided on the opening surface of the case 13 at a predetermined interval so as to cover the entire LED assembly 120. Here, the predetermined interval is used in order to create a surface emission state which will be described in detail later by using the light reflected and bounced off the display panel 11. Further, since the LED assembly 120 generates heat during operation, a space is required between the LED assembly 120 and the display panel 11 in order to protect the display panel 11 or prevent the LED assembly 120 from overheating. is there.

  The LED assembly 120 is configured by arranging LED modules 20 that emit light from the inside of the internal illumination display device 100 on both surfaces of the base plate 15 in a matrix. As the density of the LED module 20 increases, the brightness increases, but the amount of heat generation also increases. Moreover, in order to ensure the effective area of the reflecting plate 14 provided on the base plate 15 described in detail later, it is necessary to arrange the LED modules 20 at a certain interval from each other.

  The base plate 15 is provided as a flat plate for fixing the LED module 20 in the LED assembly 120. A reflective plate 14 is provided on the base plate 15 from the opening surface toward the outside. In the present embodiment, the base plate 15 and the reflecting plate 14 are a single component formed as a single unit. However, by providing the reflecting plate 14 separately from the base plate 15, the position where the reflecting plate 14 is provided may be adjusted to control light reflection.

  The LED module 20 is configured by mounting one or more white LEDs 22 on a substrate 21.

  The white LED 22 is a pseudo white light emitting diode that emits white light by applying a yellow YAG phosphor (yttrium, aluminum, garnet phosphor) to a blue LED, and emits white light that is transmitted through the display panel 11. As long as it can emit white light, a white LED that emits white light using an ultraviolet light-emitting diode and an RGB phosphor, or a white LED including three LEDs of red, green, and blue may be used.

  As shown in FIG. 1, the display panel 11 is made of a material that transmits visible light, such as a translucent acrylic plate, and forms a symbol mark, a logo, or the like in two colors, colorless or white and another color. The visible light transmittance varies depending on the color and thickness of the display panel 11. For example, if the visible light transmittance is 70%, the remaining 30% light is reflected without being transmitted. In addition to the acrylic plate, a glass plate or a resin plate may be used as long as it transmits a part of visible light, and a film, cloth, paper, or the like may be used as long as the same function can be exhibited.

  The display panel 11 has a two-color configuration including a colored portion 11a and a white portion 11b. The colored portion 11a and the white portion 11b may be directly colored on the display panel 11, but may be configured by attaching a film or the like, or may be formed by combining acrylic plates having different hues.

  Here, even when the white portion 11b is not white but colorless, since the LED assembly 120 emits white light, the colorless portion emits white as in the case of white. At that time, the display panel 11 may be formed of a transparent acrylic plate or the like, or a hole may be provided in the display panel 11 to provide a colorless portion.

  As shown in FIG. 2B, the display panel 11 and the LED assembly 120 are provided on both the front and back surfaces of the internal illumination display device 100. However, when one side of the internal illumination display device 100 is in contact with the wall of the store, the display panel 11 may be provided only on one side that is not in contact with the wall. In that case, the internal LED assembly 120 does not need to be provided on both the front and back sides, and may be provided only on one side where the display panel 11 is provided.

  The reflection plate 14 is disposed inside the display unit 10 toward the opening surface. The reflector 14 reflects the white light emitted by the white LED 22 and emits light having a secondary wavelength. Although the hue of the reflecting plate 14 is the same or the same hue as the hue of the corresponding display panel 11, the reflecting plate 14 is red because the colored portion 11a of the display panel 11 is red here.

  When the area of the white portion 11b of the display panel 11 is relatively small as in the present embodiment, the reflecting plate 14 is configured with the entire surface facing the display panel 11 in red. However, only the part located behind the red part as the colored part 11a in the display panel 11 may be red, that is, the part located behind the letter “A” may not be red. Alternatively, the back side of the letter “A” may be configured with a pseudo figure such as a triangle shape that resembles the letter and not red.

  Here, the reflecting plate 14 needs to be provided to such an extent that the LED assembly 120 and the reflecting plate 14 as a whole do not prevent the white light from being emitted. This is because if the red hue becomes too strong, even the white portion 11b of the display panel 11 is displayed in red.

  The reflection plate 14 is configured by providing a film or the like coated with a phosphor on the base plate 15 so as to be freely peeled off like a seal. By doing so, it is possible to individually adjust the display panel 11 having a complicated design, and it is possible to flexibly cope with the target color development. Alternatively, the base plate 15 itself can be formed by applying a fluorescent material, or the base plate 15 itself can be formed of the material of the hue, so that the base plate 15 can also serve as the reflector 14. .

  Moreover, in order to increase the area of the reflecting plate 14, a film coated with a phosphor may be attached to the substrate 21 of the LED module 20, or the substrate itself may be colored. This is an effective means for ensuring the luminance or for arranging the LED modules 20 on the base plate 15 at a high density.

  Below, the case where the internal illumination display apparatus 100 which concerns on embodiment of this invention is operate | moving is demonstrated.

  FIG. 3 shows a cross-sectional side view of the display unit 10 according to an embodiment of the present invention during operation. When power is applied from a power supply device (not shown), the white LED 22 emits white light, and white light is emitted from the entire LED assembly 120.

  Here, for example, when the transmittance of the display panel 11 is 70%, 70% of the white light emitted by the white LED 22 is transmitted through the display panel 11 as indicated by the solid line in FIG. The light of the color of the panel 11 is emitted toward the outside. The remaining 30% is reflected and bounced off the display panel 11 as indicated by the broken line in FIG. 3, and is reflected on the reflecting plate 14 while being reflected on every part inside the display unit 10. Depending on the hue, light of a secondary wavelength is emitted. As a result, light having a wavelength necessary for coloring the colored portion of the display panel 11 is supplemented, and the display panel 11 emits light with a high color rendering property.

  As described above, the present invention utilizes the characteristics of the internal illumination display device 100 using the display panel 11 that transmits part of visible light and reflects part of light. That is, part of the light emitted by the white LEDs 22 arranged at a high density is transmitted through the display panel 11 to cause the display panel 11 to emit light. The light that has not been transmitted is reflected by any part inside the display unit 10, and the part that is not directly irradiated by the white LED 22 is also emitted, and as a result, the entire display panel 11 emits light. Create a state. This is an effect unique to the internal illumination display device 100 that cannot be achieved by a configuration in which the display panel 11 is illuminated in a form of illumination from the outside like an external illumination display device.

  Therefore, the secondary wavelength light emitted by reflecting the white light emitted from the white LED 22 to the reflecting plate 14 and the white light emitted by the white LED 22 are integrated, and the color rendering property with the short wavelength compensated. The internal illumination display device 100 emits light with a high white color. In other words, each of the white LEDs 22 is prevented from appearing as fine dots, and the internal illumination display device 100 appears to emit light from the display panel 11 itself.

  Hereinafter, modified examples of the display unit 10 will be described with reference to FIGS. 4 to 6.

  FIG. 4 is a front view of a display unit 40 including a display panel 41 (not shown) having a two-color configuration of green and white. In order to show the internal configuration, the display panel 41 is shown in a removed state. Since the display panel 41 is mostly green, the reflection plate 44 provided on the base plate 15 of the LED assembly 120 is configured in green. As a result, the green portion of the display panel 41 emits light with a high color rendering property.

  FIG. 5 is a front view of a display unit 50 including a display panel 51 (not shown) having a configuration in which three colors of red, yellow, and white are scattered in a complicated manner. In order to show the internal configuration, the display panel 51 is shown in a removed state. The reflection plate 54 provided on the base plate 15 of the LED assembly 120 is configured by a check pattern of a yellow portion 54a and a red portion 54b. By doing so, the red portion 54b and the yellow portion 54a of the panel can be made to emit light with rich color rendering.

  FIG. 6 is a front view of a display unit 60 including a display panel 61 (not shown) having a four-color configuration in which a white color is used as a base, blue at the bottom, red at the top, and green at both ends. In order to show the internal configuration, the display panel 61 is shown in a removed state. The reflector 64 includes a round red portion 64a, a triangular green portion 64b, and a horizontal stripe blue portion 64c. As described above, by arranging the same color or the same color on the reflecting plate 64 located in the corresponding portion of the display panel 61, the display panel 61 can emit light with a high color rendering property. Moreover, in this embodiment, the part which emits the light of the secondary wavelength of the reflecting plate 64 is comprised by the reflective sheet which can be peeled off formed in the round shape or the triangular shape. Therefore, since it can be easily peeled off like a seal, it is possible to individually adjust the hue even for a panel having a complicated design.

  Further, it is possible to cope with a case where the hue to be colored changes depending on the environment of the installation location. For example, the color development can be adjusted by attaching a reflective sheet according to the situation that is likely to affect the color development, such as when it is installed outdoors or when it is affected by other signboards nearby. can do.

  According to the above embodiment, the following effects can be obtained.

  Since the white light emitted from the white LED 22 is reflected on the reflecting plate 14, the light of a wavelength corresponding to the hue of the reflecting plate 14 is emitted to compensate for the missing portion of the hue. As a result, it is possible to obtain an internal illumination display device 100 that emits light with high color rendering properties and is displayed clearly.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

  The internal illumination display device according to the present invention can be used for an internal illumination signboard that emits light by irradiating a display panel displaying information from the inside.

It is a front view of the internal illumination display apparatus which concerns on embodiment of this invention. It is the front view and sectional drawing of a side surface of the display part which concern on embodiment of this invention. It is a block diagram of the cross section of the side surface of the display part which concerns on implementation of this invention in operation. It is a front view of a display part provided with the display panel by a two-color structure of green and white. It is a front view of a display part provided with the display panel by the structure by which three colors of red, yellow, and white are scattered intricately. It is a front view of a display part provided with the display panel of a four-color structure by which blue is arrange | positioned at the lower part and red and green are arrange | positioned at the upper part based on white.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Internal illumination display apparatus 10 Display part 11 Display panel 11a Colored part 11b White part 12 Support | pillar 13 Case 14 Reflector 15 Base plate 20 LED module 22 White LED
40 Display Unit 44 Reflector 50 Display Unit 54 Reflector 60 Display Unit 64 Reflector 120 LED Assembly

Claims (3)

A display panel that transmits visible light and includes a plurality of hues;
Has a white LED that emits white light, and LED module that emits light that transmits the display panel from the rear side of the display panel,
Further arranged on the back side of the display panel, which is composed of the same color or the same hue as the hue at the corresponding position of the display panel, and further reflects the light reflected by the LED panel and bounced off the display panel a reflector for emitting light at secondary wavelength toward the display panel and,
In the internal illumination display device comprising:
The display panel is composed of two systems of hues of colorless or white and another color other than that,
The internal light display device , wherein the reflection plate is configured with a hue of the same color or the same color as the hue of the other color . A base plate for fixing the LED module;
2. The internal illumination display device according to claim 1, wherein the reflection plate is configured by affixing a peelable reflection sheet to the base plate . 3. 3. The internal illumination display device according to claim 1 , wherein the reflection plate is provided in a portion other than a portion corresponding to colorless or white of the display panel .