JP2010237247A - Luminous display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminous display device configured to perform selective switching of light irradiation between visible light and invisible light with respect to a plurality of display parts constituted of figures and letters, etc., formed on a light guide plate so that the luminous display can be performed while classifying the display parts. <P>SOLUTION: The luminous display device 10 includes: a light source part 14; the light guide plate 11 disposed adjacent to the light source part 14; and the display part 15 disposed in the light guide plate 11. The light source part 14 includes a visible light LED 14a, an ultraviolet LED 14b and an infrared LED 14c. The display part 15 includes the visible light emitting part 15a, an ultraviolet light emitting part 15b and an infrared light emitting part 15c which are arranged in predetermined positions in the light guide plate 11. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a light-emitting display device that can be mounted on an operation unit such as a mobile phone or navigation, a display panel, or the like.

  A conventional flat display device includes a thin light guide plate that receives light emitted from a light source such as a light emitting diode on a side surface and emits light in a planar shape, and various display units provided on the surface of the light guide plate. Configured. As disclosed in Patent Document 1, such a display device is often used for the purpose of emitting and displaying key switches in thin electronic devices such as mobile phones.

  The display unit directly prints display objects such as numbers, letters, and patterns on the surface of the light guide plate with each color ink or fluorescent paint, or arranges a film member made of the display object on the light guide plate. Is formed. As the light source for entering the light guide plate, white light is often used. However, in order to display the display section in each color by emitting light, a light emitting diode such as red or blue or a combination of these light emitting diodes and a filter of each color is combined. Configured.

  In addition, when the display device is used as an operation panel such as a mobile phone, the display unit may be selectively lit and displayed in accordance with an operation function. For example, in a keypad of an electronic device disclosed in Patent Document 2, a light guide plate is provided so as to cover a plurality of key switches arranged on a substrate, and light emission as a light source is provided on one side surface of the light guide plate. The element is arranged. In the keypad, key buttons corresponding to the key switches are arranged on the surface of the light guide plate. In the present invention, in order to cause the key buttons to emit light with different light emission colors, various filters are arranged under the key buttons.

  Patent Document 3 discloses a light guide sheet having a plurality of light emitting regions. In this light guide sheet, the light emitting region is made of a light reflecting material including a correction material that suppresses absorption of a specific light component, and has an effect of suppressing variation in light emission color. For this reason, it becomes possible to light-emit the light guide sheet whole surface with a uniform color irrespective of the arrangement position of a light source.

JP 2000-165490 A JP 2008-098160 A JP 2008-177106 A

  However, in the above conventional example, since a light emitting diode having a single or a plurality of visible light wavelengths is used as a light source, the display unit also emits light with a single color or the same color excited by the light emitting diode. . In addition, when there are a plurality of display units, even if each display unit is formed of a fluorescent agent having a different emission color, the light emission effect is the same if the wavelength of the light source is the same, so that various light emission effects can be obtained. I can't.

  In Patent Document 3, a plurality of light emitting regions are formed in a light guide sheet, and the light emitting regions are formed of a light reflecting material including a correction material that suppresses absorption of a specific light component. For this reason, although the light emission variation in the whole light guide sheet is reduced, the light emission color is changed for each light emitting region, or a specific display unit is not selectively configured to emit light.

  In the above conventional examples, a plurality of display portions provided at predetermined positions of the light guide plate or the light guide sheet are differentiated by changing the light emission color, but this is merely recognized by the difference in the light emission color. Therefore, it is not possible to obtain a display effect in which only the selected display portion is visible and unnecessary display portions are not visible.

  Therefore, an object of the present invention is to selectively switch the irradiation with visible light and invisible light on a plurality of display portions formed of numbers, letters, etc. formed on a light guide plate, and display each light-emitting display with distinction. It is an object to provide a light-emitting display device that can be used.

  In order to solve the above problems, a light-emitting display device of the present invention is a light-emitting display device including a light source unit, a light guide plate disposed adjacent to the light source unit, and a display unit provided on the light guide plate. The light source unit includes at least one visible light source and at least one invisible light source, and the display unit includes a visible light emitting unit and an invisible light emitting unit provided at predetermined positions of the light guide plate. It is characterized by that.

  According to the light emitting display device of the present invention, a visible light source, a visible light emitting unit that emits light by the visible light source, an invisible light source, and the invisible light source when a plurality of different displays are displayed on one light guide plate. By providing an invisible light emitting part that emits light, and selectively switching between the visible light and the invisible light, only the display part to be selected can be lit and displayed, and the non-selected display part can be made invisible without emitting light. it can. As a result, each display unit can be displayed with light emission completely distinguished.

  Further, by using ultraviolet rays and infrared rays as the invisible light source, different emission color effects can be obtained.

  In addition, the visible light emitting part and the invisible light emitting part can be arranged and formed in a plane on the light guide plate, or can be laminated in the same place in a layered manner. In particular, in the case of a stacked configuration, two or more different displays can be displayed and displayed together with a change in color on one display unit.

  Furthermore, by controlling the lighting interval and lighting time of the visible light source and the invisible light source, it is possible to obtain a variety of light-emitting display effects.

1 is a perspective view of a light emitting display device according to a first embodiment of the present invention. It is an assembly perspective view in the case of combining the said light emission display apparatus with a switch board. It is sectional drawing of the light emission switch unit comprised centering on the said light emission display apparatus. It is explanatory drawing which shows the light emission effect | action by visible light and invisible light in the said light emission display apparatus. It is sectional drawing of the light emission display apparatus of 2nd Embodiment. It is sectional drawing which shows the example of 1 structure of the light emission display apparatus of 2nd Embodiment. It is sectional drawing of the said light emission display apparatus which has arrange | positioned the optical filter.

  Hereinafter, embodiments of a light emitting display device according to the present invention will be described in detail with reference to the accompanying drawings. As shown in FIG. 1, the light emitting display device 10 of the present invention includes a light guide plate 11 and a light source unit 14 provided adjacent to the light guide plate 11. On the surface of the light guide plate 11, a plurality of display portions 15 made of numbers, letters, etc. are directly formed. The light source unit 14 includes three types of side-emitting light emitting diodes having different peak wavelengths, and the respective emission surfaces are arranged toward one end of the light guide plate 11. In this embodiment, it is comprised by the visible light source which has a visible light wavelength, and two types of invisible light sources which have an invisible light wavelength. The visible light source is a visible light emitting diode (visible light LED) 14a having a peak wavelength of 450 to 650 nm, and the invisible light source is an ultraviolet light emitting diode (ultraviolet LED) 14b having a peak wavelength of 350 to 410 nm, and a peak wavelength. Is an infrared light emitting diode (infrared LED) 14c of 700 to 2000 nm.

  The light guide plate 11 is made of acrylic resin, silicone resin, or the like, the surface is a light emitting surface 13, and one of the side surfaces is a light receiving surface 12 that receives light emitted from the light source unit 14. In the light guide plate 11, the width and thickness of the light emitting surface 13 are set according to the number, size, and arrangement of the display units.

  In the present embodiment, as shown in FIG. 2, an application example when the light emitting display device 10 is combined with a switch board 31 such as a mobile phone will be described. The switch board 31 is formed by a substrate 32 on which an electrode pattern is formed and a plurality of key switches 33 disposed on the substrate 32. As the substrate 32, a resin substrate such as glass epoxy or a sheet-like flexible substrate is used. The key switch 33 includes a fixed contact 33a formed on the electrode pattern of the substrate 32, and a dome-shaped movable contact 33b disposed on the fixed contact 33a.

  The display unit 15 of the light guide plate 11 is provided at a location corresponding to each key switch 33. The display unit 15 is composed of numbers, symbols, and the like. As shown in FIG. 2, the display area can be divided into three reference numerals 15a, 15b, and 15c. Can be assigned to the display area. The area facing the visible light LED 14a is a visible light emitting part 15a, the area facing the ultraviolet LED 14b is an ultraviolet light emitting part 15b, and the area facing the infrared LED 14c is an infrared light emitting part 15c.

  The visible light emitting portion 15a is a white coating layer or a white coating layer containing, for example, a YAG fluorescent agent that is excited by irradiation with visible light. The invisible light emitting unit includes an ultraviolet light emitting unit 15b that emits light by irradiating ultraviolet rays and an infrared light emitting unit 15c that emits light by irradiating infrared rays. The ultraviolet light emitting portion 15b is an inorganic or organic ultraviolet excitation fluorescent agent excited by a wavelength of 350 to 410 nm, for example, CaAiSiN3: Eu, (SrCa) AlSiN3: Eu, CaSc2O4: Ce, (BaSr) 2SiO4: It is a coating layer containing Eu or the like, and the infrared light emitting portion 15c is an inorganic or organic infrared excitation fluorescent agent excited by a wavelength of 700 to 2000 nm, for example, erbium (Er), chlorine (Cl ), Yttrium (Y), lead (Pb), potassium (K), barium (Ba), sodium (Na), silver (Ag), and the like.

  The visible light emitting part 15a, the ultraviolet light emitting part 15b, and the infrared light emitting part 15c are printed directly on the light emitting surface 13, or a predetermined fluorescent agent is provided in a recessed portion on the light emitting surface 13 in accordance with the display form. It is formed by, for example, filling with a paint containing. In the present embodiment, a mobile phone has been described as an example. However, when the mobile phone is of a different model or applied to other electronic devices other than the mobile phone, the display unit is adapted to each application. Fifteen character types and arrangement configurations are set as appropriate.

  The visible light LED 14 a, the ultraviolet LED 14 b, and the infrared LED 14 c are disposed at the end of one side surface of the substrate 32 so that the light emitting surface faces each display unit 15. The visible light LED 14a, the ultraviolet LED 14b, and the infrared LED 14c can be turned on and off independently, and can be caused to emit light in any combination by an operation unit and control means (not shown), and repeatedly turned on and off at predetermined intervals. It can also be controlled.

  Further, as shown in FIG. 3, the light guide plate 11 is used as a planar backlight, and the display panel 34 on which the visible light emitting unit 15a, the ultraviolet light emitting unit 15b, and the infrared light emitting unit 15c are formed. It can also be arranged on the light guide plate 11. On the back surface of the display panel 34, a projection 35 is provided in a portion corresponding to the key switch 33, and the light guide plate 11 emits light in a planar shape by being placed on the light guide plate 11 through the projection 35. The visible light emitting unit 15a, the ultraviolet light emitting unit 15b, and the infrared light emitting unit 15c can be irradiated without any leakage.

  FIG. 4 shows the light emitting action and the emission wavelength corresponding to each of visible light, ultraviolet light, and infrared light. In FIG. 4A, a visible light emitting unit 15a is provided at a position opposite to the light emitting front surface of the visible light LED 14a. By turning on the visible light LED 14a, the visible light emitting unit 15a is made particularly prominent. Can emit light. The emission color at this time is an emission color corresponding to the wavelength of the visible light LED 14a. On the other hand, the ultraviolet light emitting unit 15b and the infrared light emitting unit 15c do not emit light, and the display form is not visible.

  In FIG. 4B, by providing the ultraviolet light emitting portion 15b at a position facing the light emitting front surface of the ultraviolet LED 14b, only the ultraviolet light emitting portion 15b emits light, and the display form thereof is made visible. On the other hand, the infrared light emitting portion 15c does not emit light, and its display form cannot be visually recognized. The visible light emitter 15a does not emit light brightly, but its display form is visible.

  In FIG. 4C, by providing the infrared light emitting portion 15c at a position opposite to the light emitting front surface of the infrared LED 14c, only the infrared light emitting portion 15c emits light, and the display form thereof is made visible. is there. On the other hand, the ultraviolet light emitter 15b does not emit light, and its display form cannot be visually recognized. The visible light emitter 15a does not emit light brightly, but its display form is visible.

  The lighting control of the visible light LED 14a, the ultraviolet LED 14b, and the infrared LED 14c can be performed by selecting any one of them, or by repeatedly turning on and off each other at regular intervals. Further, by changing the value of the current passed through each LED, it is possible to adjust the light emission luminance and generate a mixed intermediate color.

  FIG. 5 shows a light emitting display device according to the second embodiment. In the light emitting display device 20, a laminated display unit 25 having a laminated structure of a visible light emitting unit 25a, an ultraviolet light emitting unit 25b, and an infrared light emitting unit 25c is formed at the same location of the light guide plate 21. For example, as shown in FIG. 6, the light guide plate 21 having this structure includes three light guide thin plates 21a, 21b, on which the visible light emitting unit 25a, the ultraviolet light emitting unit 25b, and the infrared light emitting unit 25c are formed. It can be formed by laminating 21c. As in the first embodiment, the light source unit 14 is configured by arranging a visible light LED 14 a, an ultraviolet LED 14 b, and an infrared LED 14 c on one side surface of the light guide plate 21. By selecting one of the visible light LED 14a, the ultraviolet LED 14b, and the infrared LED 14c to emit light, the visible light emitting unit 25a in the laminated display unit 25 corresponding to the emitted LED, the ultraviolet light emission Either the unit 25b or the infrared light emitting unit 25c can be excited to emit light. This embodiment can be applied to a light emitting display section of a composite switch in which a plurality of functions are assigned to one switch, such as a mobile phone or a personal computer. By adopting such a switch, it is possible to hide an unselected display portion and to display only the selected display portion in a light-emitting manner, thereby preventing an erroneous operation and improving operability.

  In the first and second embodiments, the light guide plate 11, 21 has a visible light emitting part 15 a, an ultraviolet light emitting part 15 b, an infrared light emitting part 15 c or a laminated display part 25 on the back side. By performing pattern processing such as a dot or prism to obtain a reflection effect or a diffusion effect, each display unit can be brightly displayed with high visibility.

  FIG. 7 shows an example of use of the light emitting display device 10 in combination with an optical filter 30 that cuts a predetermined wavelength component. FIG. 7A shows an arrangement in which the optical filter 30 is disposed on the light emitting surface 13 of the light guide plate 11, and restricts light emitted from the visible light emitting unit 15a, the ultraviolet light emitting unit 15b, and the infrared light emitting unit 15c. can do. FIG. 7B shows the optical filter 30 disposed between the light emitting surface 13 of the light source unit 14 and the light receiving surface 12 of the light guide plate 11, and restricts the light emitted from the light source unit 14. it can.

  As shown in FIG. 7 (c), the optical filter 30 has a wavelength component necessary for cutting or passing either a visible light component or an invisible light component, or a visible light component, an ultraviolet component, and an infrared component. Those that cut or pass only can be used in appropriate combination. By using such an optical filter 30 in combination, it is possible to obtain a coloration effect rich in visibility or variations that cannot be dealt with only by the lighting control of the visible light LED 14a, the ultraviolet LED 14b, and the infrared LED 14c.

  As described above, according to the light-emitting display device of the present invention, the light source that illuminates the display unit made up of numbers, letters, etc. includes the light-emitting diode made up of a combination of visible light and invisible light, and the display unit Since it is configured so as to emit light corresponding to visible light and invisible light, it is possible to perform light emission display by completely distinguishing display required according to the state and display not required. For this reason, it is most suitable for the case where the operation state and the operation state are displayed separately for each functional unit, such as a mobile phone or a personal computer, or the display section of a multi-function switch.

DESCRIPTION OF SYMBOLS 10 Light emitting display apparatus 11 Light guide plate 12 Light-receiving surface 13 Light-emitting surface 14 Light source part 14a Visible light LED
14b UV LED
14c Infrared LED
DESCRIPTION OF SYMBOLS 15 Display part 15a Visible light emission part 15b Ultraviolet light emission part 15c Infrared light emission part 20 Light emission display device 21 Light guide plate 21a, 21b, 21c Light guide thin plate 25 Laminated display part 25a Visible light emission part 25b Ultraviolet light emission part 25c Red External light emitting unit 30 Optical filter 31 Switch board 32 Substrate 33 Key switch 33a Fixed contact 33b Movable contact 34 Display panel

Claims (6)

In a light emitting display device including a light source unit, a light guide plate disposed adjacent to the light source unit, and a display unit provided on the light guide plate,
The light source unit includes at least one visible light source and at least one invisible light source, and the display unit includes a visible light emitting unit and an invisible light emitting unit provided at predetermined positions of the light guide plate. A light emitting display device characterized by the above. The light-emitting display device according to claim 1, wherein the visible light source includes a visible light-emitting diode, and the invisible light source includes at least one of an ultraviolet light-emitting diode and an infrared light-emitting diode. The light-emitting display device according to claim 1, wherein the visible light emitting unit is disposed so as to be substantially opposed to the visible light source, and the invisible light emitting unit is disposed to be substantially opposed to the invisible light source. The light-emitting display device according to claim 1, wherein the invisible light emitting unit contains an ultraviolet-excited fluorescent agent excited by light emission of the ultraviolet light-emitting diode or an infrared-excited fluorescent agent excited by light emission of the infrared light-emitting diode. . The light emitting display device according to claim 1, wherein the visible light emitting unit and the invisible light emitting unit are formed by being laminated on a surface or inside of a light guide plate. The light emitting display device according to claim 1, further comprising an optical filter for cutting or passing a predetermined wavelength component of the visible light source or the invisible light source on the light guide plate or between the light guide plate and the light source unit.

Images