JP6673119B2 - Display device - Google Patents

Description

  The present invention relates to a display device.

  2. Description of the Related Art There is a display device that includes a display medium in which luminous bodies that emit fluorescence when excited by excitation light of two wavelengths are dispersed and held, and that displays predetermined information by fluorescence (for example, see Patent Document 1).

  In the display device disclosed in Patent Document 1, two types of infrared light sources emit infrared light of different wavelengths (first and second excitation light) toward the inside of a display unit in which phosphor fine particles are dispersed and held. ) Is irradiated. Then, predetermined information is displayed by the fluorescent fine particles present at the points where the first excitation light and the second excitation light intersect emit fluorescence.

  When the phosphor fine particles emit fluorescence, first, electrons in the ground state in the phosphor fine particles are excited by the first excitation light, and transition from the ground level to the first excitation level. Subsequently, the electrons of the first excitation level are excited by the second excitation light, and transition from the first excitation level to the second excitation level. Then, when the electrons at the second excitation level return to the ground level, the phosphor fine particles emit fluorescence.

Japanese Patent No. 5050140

  However, in the display device of Patent Literature 1, when the first excitation light travels inside the display unit in which the phosphor fine particles are dispersed and held, the first excitation light travels through ground state absorption and various radiation transition / non-radiation relaxation processes. The energy of one excitation light is always consumed. For this reason, there is a problem that the first excitation light is greatly attenuated as the first excitation light travels inside the display unit, and the luminance of the fluorescence is reduced. The decrease in the luminance of the fluorescent light due to the attenuation of the first excitation light undesirably causes a significant luminance variation particularly when the display surface is enlarged.

  The present invention has been made to solve the above-mentioned problem. Therefore, an object of the present invention is to provide a display device in which the luminance of the display surface is uniform by preventing a decrease in the luminance of the fluorescence caused by the attenuation of the first excitation light.

  The above object of the present invention is achieved by the following means.

  The display device of the present invention includes a display medium in which luminous bodies that emit fluorescence when excited by the first and second excitation lights are dispersed and held. Inside the display medium, first and second light sources emitted from the first and second light sources, respectively, by first and second introduction members arranged in a plurality of first and second directions intersecting each other. Excitation light is introduced. The display device according to the present invention is configured such that, for a plurality of light emitting points formed at the intersections of the first excitation light and the second excitation light, a plurality of light emitting points arranged in the traveling direction of the first excitation light. Then, the output of the first light source is adjusted so that the electron density of the first excitation level becomes the same.

  Further, the display device of the present invention, when emitting a light emitting point formed at the intersection of the first excitation light and the second excitation light, reduces the amount of attenuation of the first excitation light traveling inside the display medium. The output of the second light source is adjusted so as to be complemented by the second excitation light.

  According to the present invention, it is possible to provide a display device in which the luminance of the display surface is uniform.

It is a perspective view showing typically composition of a fluorescent light emitting display concerning a 1st embodiment of the present invention. It is a figure for explaining the light emission principle of a fluorescent light emitting display. 6 is a flowchart illustrating a procedure of a first excitation light output process executed by a first control unit. FIG. 4 is a diagram illustrating light emitting points arranged on a display surface. 9 is a flowchart illustrating a procedure of a second excitation light output process executed by a second control unit. FIG. 3 is a diagram showing first and second light emitting points of the fluorescent light emitting display. FIG. 3 is a diagram illustrating a state of electrons in a phosphor fine particle at a first light emitting point. FIG. 4 is a diagram illustrating a state of electrons in phosphor fine particles at a second light emitting point. FIG. 3 is a diagram showing first and second light emitting points of the fluorescent light emitting display. FIG. 3 is a diagram illustrating a state of electrons in a phosphor fine particle at a first light emitting point. FIG. 4 is a diagram illustrating a state of electrons in phosphor fine particles at a second light emitting point. It is a perspective view which shows typically the structure of the fluorescent light emission display which concerns on a modification. It is a flow chart which shows the procedure of the 1st excitation light output processing concerning a 2nd embodiment of the present invention. It is a flow chart which shows the procedure of the 2nd excitation light output processing concerning a 2nd embodiment of the present invention. FIG. 3 is a diagram showing first and second light emitting points of the fluorescent light emitting display. FIG. 3 is a diagram illustrating a state of electrons in a phosphor fine particle at a first light emitting point. FIG. 4 is a diagram illustrating a state of electrons in phosphor fine particles at a second light emitting point. It is a figure for explaining an operation effect of a fluorescent light emitting display concerning a 3rd embodiment of the present invention. It is a figure for explaining an operation effect of a fluorescent light emitting display concerning a 3rd embodiment of the present invention. It is a figure for explaining an operation effect of a fluorescent light emitting display concerning a 3rd embodiment of the present invention. It is a flow chart which shows the procedure of the 1st excitation light output processing concerning a 4th embodiment of the present invention. It is a flow chart which shows the procedure of the 2nd excitation light output processing concerning a 4th embodiment of the present invention. FIG. 3 is a diagram showing first and second light emitting points of the fluorescent light emitting display. FIG. 3 is a diagram illustrating a state of electrons in a phosphor fine particle at a first light emitting point. FIG. 4 is a diagram illustrating a state of electrons in phosphor fine particles at a second light emitting point. It is a figure for explaining an operation effect of a fluorescent display concerning a 5th embodiment of the present invention. It is a figure for explaining an operation effect of a fluorescent display concerning a 5th embodiment of the present invention. It is a figure for explaining an operation effect of a fluorescent display concerning a 5th embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals are used for similar members. In addition, the dimensional ratios in the drawings may be exaggerated for convenience of description, and may be different from the actual ratios.

(1st Embodiment)
FIG. 1 is a perspective view schematically showing a configuration of a fluorescent light emitting display 100 according to the first embodiment of the present invention.

  As shown in FIG. 1, the fluorescent light emitting display 100 of the present embodiment includes a display unit 110, a first light source unit 120, a second light source unit 130, a first control unit 140, and a second control unit 150 as display devices. .

  The display unit 110 displays information using the green fluorescent light RL1. The display unit 110 includes a display film 112 in which phosphor fine particles 111 excited by the first and second excitation lights EL1 and EL2 and emitting green fluorescence RL1 are uniformly and densely dispersed and held. The display film 112 is a rectangular film member made of a transparent resin, and displays various information on the display surface 112a. Note that, unlike the present embodiment, the display film 112 may be made of transparent glass.

  The first light source unit 120 supplies the display unit 110 with the first excitation light EL1. The first light source unit 120 includes a first light source 121, a first light distributor 122, a plurality of first optical fibers 123, and a plurality of first collimator lenses. The first light source 121 includes a laser diode, a condenser lens, and the like, and emits first excitation light EL1 that is infrared light. The first light distributor 122 selectively propagates the first excitation light EL <b> 1 emitted from the first light source 121 to one of the plurality of first optical fibers 123. The first optical fiber 123 propagates the first excitation light EL1 emitted from the first light source 121 to the first collimator lens. A plurality of first collimator lenses 124 are arranged in the X direction as a first introduction member so as to face the first end surface 112b of the display film 112, and collimate the first excitation light EL1 to the display film 112. To be introduced inside.

  The second light source unit 130 supplies the display unit 110 with the second excitation light EL2. The second light source unit 130 includes a second light source 131, a second light distributor 132, a plurality of second optical fibers 133, and a plurality of second collimator lenses 134. The second light source 131 includes a laser diode, a condenser lens, and the like, and emits a second excitation light EL2 that is an infrared light having a wavelength different from that of the first excitation light EL1. The second light distributor 132 selectively propagates the second excitation light EL2 emitted from the second light source 131 to one optical fiber 133 among the plurality of second optical fibers 133. The second optical fiber 133 propagates the second excitation light EL2 emitted from the second light source 131 to the second collimator lens 134. A plurality of second collimator lenses 134 are arranged in the Y direction as a second introduction member so as to face the second end surface 112c of the display film 112, and collimate the second excitation light EL2 to the display film 112. To be introduced inside.

  The first control unit 140 controls the first light source unit 120 as a control unit. The first control unit 140 includes a CPU and various memories, and controls operations of the first light source 121 and the first light distributor 122 according to a program. In the first control unit 140, first map information indicating the relationship between the distance from the first end surface 112b of the display film 112 and the amount of attenuation of the first excitation light EL1 is registered. Further, the first control unit 140 includes second map information indicating the relationship between the set luminance and the intensity of the first excitation light EL1, and the intensity of the first excitation light EL1 and the output of the first light source 121. The third map information indicating the relationship is registered.

  The second control unit 150 controls the second light source unit 130. The second control unit 150 includes a CPU and various memories, and controls operations of the second light source 131 and the second light distributor 132 according to a program. The second control unit 150 has fourth map information indicating the relationship between the set luminance and the intensity of the second excitation light EL2, and the relationship between the intensity of the second excitation light EL2 and the output of the second light source 131. Is registered.

  The first and second control units 140 and 150 are controlled by, for example, a higher-level control device (not shown) so as to be synchronized with each other. The first and second control units 140 and 150 control the supply of the first and second excitation lights EL1 and EL2 to the display unit 110 at appropriate timing, whereby various information is displayed. Note that, unlike the present embodiment, the first control unit 140 and the second control unit 150 may be integrally configured.

  Next, the light emission principle of the fluorescent light emitting display 100 will be described in detail with reference to FIG.

  FIG. 2 is a diagram for explaining the light emission principle of the fluorescent light emitting display 100. As described above, in the fluorescent light emitting display 100 of the present embodiment, the phosphor fine particles 111 dispersed inside the display film 112 as a display medium are excited by the first and second excitation lights EL1 and EL2 to emit green fluorescent light. Emit RL1.

  Specifically, as shown in FIG. 2, when the first excitation light EL <b> 1 is irradiated to the phosphor fine particles 111 as the light emitting body, the electrons in the light emitting material of the fluorescent fine particles 111 move from the ground level 200 to the first level. To the excitation level 210. In addition, when the phosphor particles 111 are irradiated with the second excitation light EL2, the electrons of the first excitation level 210 transition to the second excitation level 220. Then, when the electrons that have transitioned to the second excitation level 220 return to the ground level 200, green fluorescent light RL1 that is visible light is emitted.

The phosphor fine particles 111 are formed, for example, by doping erbium (Er) as a light emitting material to sodium yttrium fluoride (NaYF ₄ ) as a base material halide. The first excitation light EL1 is infrared light having a wavelength of 1550 nm, and the second excitation light EL2 is infrared light having a wavelength of 850 nm.

  When the first and second excitation lights EL1 and EL2 travel inside the display film 112, they are attenuated by absorption by the resin constituting the display film 112 and scattering by minute irregularities and impurities. In particular, the first excitation light EL1 always consumes energy due to the ground state absorption peculiar to the first excitation light EL1, and is greatly attenuated as compared with the second excitation light EL2.

  Note that the luminance of the green fluorescent light RL1 emitted from the phosphor fine particles 111 is substantially proportional to the electron density of the second excitation level 220. Also, the number of electrons that are excited by the first excitation light EL <b> 1 and transition from the ground level 200 to the first excitation level 210 (that is, the electron density of the first excitation level 210) is determined by the fluorescent fine particles 111. It is substantially proportional to the intensity of the irradiated first excitation light EL1. Similarly, the number of electrons that are excited by the second excitation light EL2 and transition from the first excitation level 210 to the second excitation level 220 (that is, the electron density of the second excitation level 220) is equal to the fluorescence. The intensity is substantially proportional to the intensity of the second excitation light EL2 applied to the body particles 111.

  In the fluorescent light emitting display 100 configured as described above, a point in the display film 112 where the first excitation light EL1 and the second excitation light EL2 intersect functions as a light emitting point 300 (see FIG. 4) that emits the fluorescent light RL1. I do. By controlling the light emission / non-light emission and light emission luminance of the plurality of light emitting points 300 arranged in a matrix in the display film 112, the plurality of light emitting points 300 are sequentially emitted one by one to provide various information. Is displayed on the display surface 112a. At this time, in order to prevent a decrease in the luminance of the light emitting point 300 due to the attenuation of the first excitation light EL1, the light from the first end face 112b of the display film 112 to which the first excitation light EL1 is incident to the light emitting point 300 is prevented. The output of the first light source 121 is adjusted according to the distance. Hereinafter, the operation of the fluorescent light emitting display 100 will be described in detail with reference to FIGS. 3 to 7C.

  First, the operation of the first light source unit 120 will be described with reference to FIG.

FIG. 3 is a flowchart illustrating a procedure of the first excitation light output process executed by the first control unit 140. Note that the algorithm shown by the flowchart in FIG. 3 is stored as a program in the memory of the first control unit 140, and is executed by the CPU. In the following, as shown in FIG. 4, the traveling direction emission point 300 on the _{X 2} rows extending in direction (Y direction) of the first excitation light EL1 on the display surface 112a of the display film 112, the position _X 2, Y A case where light is emitted sequentially from _one light emitting point 300 will be described as an example.

First, the first control unit 140 sets n = 1 as a variable n of the light emission positions X ₂ and Y _n (step S101).

Next, the first control unit 140 recognizes the set luminance of the light emitting point 300 of the light emitting position _X 2, _{Y n,} to set the intensity of the first excitation light EL1 required to set the brightness (step S102). More specifically, the first control unit 140 refers to the second map information showing a relation between the set brightness and intensity of the first excitation light EL1, to the light emitting point 300 of the position X _2, Y _n The intensity of the first excitation light EL1 is set based on the required brightness.

Next, the first control unit 140 estimates the attenuation of the first excitation light EL1 at position _{Y n} (step S103). More specifically, the first control unit 140 refers to the first map information indicating the relationship between the distance from the first end surface 112b of the display film 112 and the amount of attenuation of the first excitation light EL1, and determines the position Y The attenuation of the first excitation light EL1 at _n is estimated.

Next, the first control unit 140 sets the output of the first light source 121 (Step S104). More specifically, the first control unit 140 determines the intensity of the first excitation light EL1 (set intensity) set in the processing shown in step S102 and the first excitation light EL1 estimated in the processing shown in step S103. The output of the first light source 121 is set based on the amount of attenuation. The first control unit 140 refers to the third map information indicating the intensity of the first excitation light EL1 and the relationship between the output of the first light source 121, the first excitation light at the position _X 2, _{Y n} EL1 The output of the first light source 121 is set so that the intensity becomes the set intensity.

  Next, the first control unit 140 controls the first light source 121 to output the first excitation light EL1 with the output set in the processing shown in step S104 (step S105).

The first control unit 140 controls the first light distribution 122, introducing a first pumping light EL1 outputted from the first light source 121 to the first optical fiber 123 of the position _{X 2} (Step S105). As a result, the first optical fiber 123 of the position _{X 2,} through the first collimator lens 124, a first pumping light EL1 is introduced into the interior of the display film 112. The first excitation light EL1 travels linearly inside the display film 112 in the Y direction. At this time, the second light source unit 130 is controlled in synchronism with the first light source unit 120, a second pumping light EL2 is introduced from the second optical fiber 133 positions _{Y n} inside the display film 112. The second excitation light EL2 travels linearly inside the display film 112 in the X direction. Then, the first excitation light beam EL1 and the second excitation light EL2 intersect at position _X 2, _{Y n,} the position _X 2, the light emitting point 300 of the _{Y n} emits light at setting brightness.

Next, the first control unit 140, light emission of all the light emitting point 300 on _{X 2} columns to determine whether or not it is completed (step S107). If the light emission of all the light emitting point 300 is determined not to be finished (step S107: NO), the first control unit 140, the light emitting position _X 2, a _{Y n} of the variable n increases by 1 (step S108), The process returns to step S102.

  On the other hand, when it is determined that the light emission of all the light emitting points 300 has ended (step S107: YES), the first control unit 140 ends the processing.

As described above, according to the process of the flowchart shown in FIG. 3, the light emitting point 300 on X ₂ columns to emit light in sequence, the first excitation light EL1 is introduced repeatedly into the inside of the display film 112. At this time, the amount of attenuation of the first excitation light EL1 is estimated, and the output of the first light source 121 is adjusted so as to complement the amount of attenuation. Specifically, the output of the first light source 121 is adjusted so that the output of the first light source 121 increases as the distance from the first end surface 112b of the display film 112 to the light emitting point 300 increases. According to such a configuration, if the set luminance is the same, the intensity of the first excitation light EL1 becomes the same at all the light emitting points 300. As a result, all the light emitting points 300 emit light with the same luminance, and the luminance of the display surface 112a is made uniform.

  Next, the operation of the second light source unit 130 will be described with reference to FIG.

  FIG. 5 is a flowchart illustrating a procedure of the second excitation light output process executed by the second control unit 150. The algorithm shown by the flowchart in FIG. 5 is stored as a program in the memory of the second control unit 150, and is executed by the CPU.

First, the second control unit 150 sets n = 1 as a variable n of the light emission positions X ₂ and Y _n (step S201).

Next, the second control unit 150 recognizes the set luminance of the light emitting point 300 of the light emitting position _X 2, _{Y n,} to set the intensity of the second excitation light EL2 required to set the brightness (step S202). More specifically, the second control unit 150 refers to the fourth map information showing a relation between the set brightness and intensity of the second excitation light EL2, to the light emitting point 300 of the position X _2, Y _n From the required brightness, the intensity of the second excitation light EL2 is set.

  Next, the second control unit 150 sets the output of the second light source 131 (Step S203). More specifically, the second control unit 150 refers to the fifth map information indicating the relationship between the intensity of the second excitation light EL2 and the output of the second light source 131, and performs setting in the process illustrated in step S202. The output of the second light source 131 is set based on the intensity of the second excitation light EL2 thus obtained.

  Next, the second control unit 150 controls the second light source 131 to output the second excitation light EL2 with the output set in the processing shown in step S203 (step S204).

The second control unit 150 controls the second light distribution device 132, introducing a second excitation light EL2 emitted from the second light source 131 to the second optical fiber 133 positions _{Y n} (Step S205). As a result, from the second optical fiber 133 of the position _{Y n,} via the second collimator lens 134, a second pumping light EL2 is introduced into the interior of the display film 112. The second excitation light EL2 travels linearly inside the display film 112 in the X direction. Second pumping light EL2 advancing linearly the inside of the display film 112 intersects the first excitation light EL1 at position _X 2, _{Y n,} emitted from the light emitting point 300 is set luminance position _X 2, _{Y n} I do.

Next, the second control unit 150, light emission of all the light emitting point 300 on _{X 2} columns to determine whether or not it is completed (step S206). If the light emission of all the light emitting point 300 is determined not to be finished (step S206: NO), the second control unit 150, the light emitting position _X 2, _{Y n} of the variable n increases by 1 (step S207), The process returns to step S202.

  On the other hand, when it is determined that the light emission of all the light emitting points 300 has ended (step S206: YES), the second control unit 150 ends the processing.

As described above, according to the process of the flowchart shown in FIG. 5, the light emitting point 300 on X ₂ columns to emit light in sequence, a second pumping light EL2 is introduced repeatedly into the inside of the display film 112.

  Next, with reference to FIGS. 6A to 7C, the operation and effect of the fluorescent light emitting display 100 according to the present embodiment will be described in detail.

  6A to 6C are diagrams for explaining the light emitting state of the fluorescent light emitting display 100 according to the present embodiment, and FIGS. 7A to 7C illustrate the light emitting state of a general fluorescent light emitting display as a comparative example. FIG.

  6A and 7A are diagrams showing first and second light emitting points 310 and 320 on the display surface 112a of the fluorescent light emitting display. FIGS. 6B and 7B are diagrams showing states of electrons in the phosphor fine particles 111 at the first light emitting point 310. FIG. FIGS. 6C and 7C are diagrams showing states of electrons in the phosphor fine particles 111 at the second light emitting point 320. FIG. Hereinafter, a case where the set luminance of all the light emitting points 300 is the same will be described as an example.

  As shown in FIG. 7A, in a general fluorescent light emitting display, the output of the first light source 121 is kept constant regardless of the distance from the first end face 112b of the display film 112 to the light emitting point 300. Therefore, due to the attenuation of the first excitation light EL1, the intensity of the first excitation light EL1 decreases as the distance from the first end surface 112b of the display film 112 to the light emitting point 300 increases. Specifically, when the second light emitting point 320 is farther from the first end face 112b than the first light emitting point 310, the intensity of the first excitation light EL1 at the second light emitting point 320 becomes equal to the first light emitting point. The intensity becomes lower than the intensity of the first excitation light EL1 at the light emitting point 310.

  According to such a configuration, as shown in FIG. 7B and FIG. 7C, the electron density of the first excitation level 210 in the phosphor fine particles 111 at the second light emitting point 320 is reduced by the phosphor at the first light emitting point 310. The electron density of the first excited level 210 in the fine particles 111 becomes lower. Therefore, in a general fluorescent light emitting display, the electron density of the second excitation level 220 is also lower at the second light emitting point 320, and the luminance of the second light emitting point 320 is lower than the luminance of the first light emitting point 310. Lower than. As a result, in a general fluorescent light emitting display, the luminance of the display surface 112a varies.

  On the other hand, as shown in FIG. 6A, in the fluorescent light emitting display 100 according to the present embodiment, the first light source 121 is set so that the intensity of the first excitation light EL1 is the same at all the light emitting points 300 in the display surface 112a. The output is adjusted. Specifically, when the second light emitting point 320 that is farther from the first end face 112b of the display film 112 than the first light emitting point 310 emits light, the output of the first light source 121 is increased.

  According to such a configuration, as shown in FIGS. 6B and 6C, the electron density of the first excitation level 210 is the same between the first and second light emitting points 310 and 320. Therefore, the electron density of the second excitation level 220 becomes the same, and the luminance of the first and second light emitting points 310 and 320 also becomes the same. As a result, according to the fluorescent light emitting display 100 of the present embodiment, the luminance of the display surface 112a is made uniform.

  As described above, the present embodiment has the following advantages.

  (A) If the set luminance is the same, the output of the first light source 121 is adjusted so that the electron density of the first excitation level 210 is the same at all the light emitting points 300. Therefore, a decrease in the luminance of the light emitting point 300 due to the attenuation of the first excitation light EL1 is prevented, and the luminance of the display surface 112a can be made uniform. As a result, the size of the display surface 112a can be increased.

  (B) The output of the first light source 121 is adjusted so that the output of the first light source 121 increases as the distance from the first end face 112b of the display film 112 to the light emitting point 300 increases. Therefore, the brightness of the light emitting point 300 can be made uniform while the energy consumption of the first light source 121 is minimized. Further, the control of the intensity of the second excitation light EL2 can be specialized to the control for displaying information, and the control of the second light source 131 is simplified. Further, by providing the light incident surface on which the first excitation light EL1 is incident on the end face on the long side of the display film 112, a low-output light source can be used as the first light source 121.

(Modification)
In the embodiment described above, information is displayed in a single color by the green fluorescent light RL1. However, information may be displayed in color by the green, red, and blue fluorescent lights RL1, RL2, and RL3.

  FIG. 8 is a perspective view schematically showing a configuration of a fluorescent light emitting display 100 according to a modification. In the fluorescent light emitting display 100 according to the modification, the display film 112 includes, in addition to the fluorescent particles 111 emitting the green fluorescent RL1, the fluorescent particles 113 emitting the red fluorescent RL2 and the fluorescent particles 114 emitting the blue fluorescent RL3. Distributed.

The phosphor fine particles 113 are formed, for example, by doping praseodymium (Pr) as a light emitting material into NaYF _{4 as} a base material. When excited by the third excitation light EL3 (infrared light having a wavelength of 1014 nm) and the fourth excitation light EL4 (infrared light having a wavelength of 840 nm), the phosphor fine particles 113 emit red fluorescent light RL2. Emits.

The phosphor fine particles 114 are formed by, for example, doping a base material of NaYF ₄ with a luminescent material of thulium (Tm). When excited by the fifth excitation light EL5 (infrared light having a wavelength of 800 nm) and the sixth excitation light EL6 (infrared light having a wavelength of 1120 nm), the phosphor fine particles 114 emit blue fluorescent light RL3. Emits.

  The first light source unit 120 includes, in addition to the above-described configuration, a third light source 125 that emits the third excitation light EL3, a fifth light source 126 that emits the fifth excitation light EL5, and first, third, and third light sources. A first multiplexer 127 for multiplexing the fifth excitation lights EL1, EL3, and EL5 is provided. The third and fifth light sources 125 and 126 are controlled by the first control unit 140.

  The second light source unit 130 includes, in addition to the above-described configuration, a fourth light source 135 that emits the fourth excitation light EL4, a sixth light source 136 that emits the sixth excitation light EL6, and second, fourth, and fourth light sources. A second multiplexer 137 for multiplexing the sixth excitation lights EL2, EL4, and EL6 is provided. The fourth and sixth light sources 135 and 136 are controlled by the second control unit 150.

  In the fluorescent light emitting display 100 configured as described above, the first, third, and fifth excitation lights EL1, EL3, and EL5 are introduced from the first end surface 112b of the display film 112, and the inside of the display film 112 is linearly moved. Proceed to. On the other hand, the second, fourth, and sixth excitation lights EL2, EL4, and EL6 are introduced from the second end surface 112c of the display film 112, and linearly advance inside the display film 112. The emission point 300 at the position where the first, third, and fifth excitation lights EL1, EL3, and EL5 intersect with the second, fourth, and sixth excitation lights EL2, EL4, and EL6 is green, It emits red and blue fluorescent light RL1, RL2, RL3. As a result, predetermined information is displayed in color on the display surface 112a.

  In the present modification, in order to prevent a decrease in luminance due to attenuation of the first, third, and fifth excitation lights EL1, EL3, and EL5, the distance from the first end face 112b of the display film 112 is determined according to the distance. The outputs of the first, third, and fifth light sources 121, 125, 126 are adjusted. Therefore, if the set luminance is the same, the electron density of the first excitation level 210 is the same for the phosphor fine particles 111, 113, and 114 at all the light emitting points 300. As a result, all the light emitting points 300 emit light with the same luminance, and the luminance of the display surface 112a is made uniform.

  The attenuation characteristics of the first, third, and fifth excitation lights EL1, EL3, and EL5 with respect to the display film 112 are different from each other. For this reason, in the present modification, the first map information indicating the relationship between the distance from the first end surface 112b of the display film 112 and the amount of attenuation of each excitation light is created for each excitation light, and the first control unit 140 Each is registered.

  In this modification, the first to sixth light sources 121, 125, 126, 131, 135, and 136 are controlled by the first and second control units 140 and 150. However, unlike this modification, third to sixth control units are additionally provided, and the first to sixth light sources 121, 125, 126, 131, 135, and 136 are controlled by the first to sixth control units. Each may be controlled.

(2nd Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. 9 to 11C. The present embodiment is an embodiment in which the electron density of the first excitation level 210 is saturated at all the light emitting points 300.

FIG. 9 is a flowchart illustrating a procedure of the first excitation light output processing according to the present embodiment. The configuration of the fluorescent light emitting display 100 according to the present embodiment is the same as that of the first embodiment except that the control contents of the first and second light sources 121 and 131 are different. The description of the configuration is omitted. Also, in the following, it will be described as an example the case of the light emitting point 300 on X ₂ rows in order.

  First, the first control unit 140 controls the first light source 121 to output the first excitation light EL1 with a predetermined output (step S301). Here, the predetermined output is an output at which the electron density of the first excitation level 210 becomes saturated at the light emitting point 300 at the farthest distance from the first end surface 112b of the display film 112. In other words, the predetermined output is an output at which the electron density of the first excitation level 210 is saturated at all the light emitting points 300 of the display film 112.

Next, the first control unit 140 controls the first light distribution 122, introducing a first pumping light EL1 emitted from the first light source 121 to the first optical fiber 123 of the position _{X 2} (Step S302). As a result, the first excitation light EL1 is introduced from the first optical fiber 123 position _{X 2} in the interior of the display film 112. At this time, the second light source unit 130 is controlled in synchronism with the first light source unit 120, a second pumping light EL2 is introduced from the second optical fiber 133 positions _{Y n} inside the display film 112. The intensity of the second excitation light EL2 is adjusted according to the set luminance. The first excitation light beam EL1 and the second excitation light EL2 intersect at position _X 2, _{Y n,} the light emitting point 300 of the position _X 2, _{Y n} emits light at setting brightness.

Next, the first control unit 140, light emission of all the light emitting point 300 on _{X 2} columns to determine whether or not it is completed (step S303). When it is determined that the light emission of all the light emitting points 300 has not been completed (step S303: NO), the first control unit 140 returns to the processing of step S301.

  On the other hand, when it is determined that the light emission of all the light emitting points 300 has ended (step S303: YES), the first control unit 140 ends the processing.

As described above, according to the process of the flowchart shown in FIG. 9, the light emitting point 300 on X ₂ columns to emit light in sequence, the first excitation light EL is introduced repeatedly into the inside of the display film 112. At this time, the output of the first light source 121 is adjusted such that the electron density of the first excitation level 210 is saturated at all the light emitting points 300. According to such a configuration, the electron density of the first excitation level 210 is the same at all the light emitting points 300. As a result, if the set luminance is the same, all the light emitting points 300 emit light with the same luminance, and the luminance of the display surface 112a is made uniform.

  Next, the operation of the second light source unit 130 will be described with reference to FIG.

  FIG. 10 is a flowchart illustrating the procedure of the second excitation light output processing according to the present embodiment.

First, the second control unit 150 sets n = 1 as a variable n of the light emission positions X ₂ and Y _n (step S401).

Next, the second control unit 150 recognizes the set luminance of the light emitting point 300 of the light emitting position _X 2, _{Y n,} to set the intensity of the second excitation light EL2 required to set the brightness (step S402). More specifically, the second control unit 150 controls the intensity of the second excitation light EL2 to achieve the set luminance on the assumption that the electron density of the first excitation level 210 is in a saturated state. The intensity of the second excitation light EL2 is set with reference to predetermined map information.

  Next, the second control unit 150 sets the output of the second light source 131 (Step S403). Since the processing after step S403 is the same as the processing after step S203 in FIG. 5, the description of the processing after step S403 is omitted.

As described above, according to the process of the flowchart shown in FIG. 10, the light emitting point 300 on X ₂ columns to emit light in sequence, a second pumping light EL2 is introduced repeatedly into the inside of the display film 112. At this time, assuming that the electron density of the first excitation level 210 is in a saturated state, the intensity of the second excitation light EL2 is set, and the second light source 121 outputs an output corresponding to the set intensity. The second excitation light EL2 is output.

  Next, with reference to FIGS. 11A to 11C, the operation and effect of the fluorescent light emitting display 100 according to the present embodiment will be described in detail.

  FIG. 11A is a diagram showing first and second light emitting points 310 and 320 on the display surface 112a of the fluorescent light emitting display 100. FIGS. 11B and 11C are diagrams showing states of electrons in the phosphor fine particles 111 at the first and second light emitting points 310 and 320. FIG. Hereinafter, a case where the set luminance of all the light emitting points 300 is the same will be described as an example.

  As shown in FIG. 11A, in the fluorescent light emitting display 100 of the present embodiment, the output of the first light source 121 is adjusted such that the electron density of the first excitation level 210 becomes saturated at all the light emitting points 300. You. Then, regardless of the distance from the first end surface 112b of the display film 112 to the light emitting point 300, the first excitation light EL1 is output from the first light source 121 with the adjusted output.

  According to such a configuration, as shown in FIG. 11B and FIG. 11C, the first excitation level 210 between the first and second light emitting points 310 and 320 having different distances from the first end face 112b of the display film 112. Have the same electron density. Therefore, the electron density of the second excitation level 220 becomes the same, and the luminance of the first and second light emitting points 310 and 320 also becomes the same. As a result, the luminance of the display surface 112a is made uniform.

  As described above, the present embodiment described above has the following effects in addition to the effects of the first embodiment.

  (C) Since the output of the first light source 121 is adjusted so that the electron density of the first excitation level 210 is saturated at all the light emitting points 300, the first light source 121 is provided for each light emitting point 300. There is no need to adjust the output. Therefore, only the first light source 121 needs to be ON / OFF controlled, and the configuration of the fluorescent light emitting display 100 is simplified, and the manufacturing cost is suppressed.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. 12A to 12C. This embodiment is an embodiment implemented by combining the first embodiment and the second embodiment.

  FIGS. 12A to 12C are diagrams for explaining the operation and effect of the fluorescent light emitting display 100 according to the present embodiment. Hereinafter, a case where the set luminance of all the light emitting points 300 is the same will be described as an example.

  In the fluorescent light emitting display 100 of the present embodiment, when the light emitting point 300 that is short from the first end face 112b of the display film 112 emits light, the first light source 121 is controlled to be ON / OFF with a constant output. On the other hand, when the light emitting point 300 that is far from the first end surface 112b of the display film 112 emits light, the output of the first light source 121 is temporarily increased.

  Specifically, as shown in FIG. 12A and FIG. 12B, when the first and second light emitting points 310 and 320 that are close to the first end surface 112b of the display film 112 emit light, the first light source 121 The first excitation light EL1 is output at a predetermined output. Here, the predetermined output is such that the electron density of the first excitation level 210 becomes saturated at both the first and second light-emitting points 310 and 320, and the third output whose distance from the first end face 112b is long. At the light emitting point 330, the output is such that the electron density of the first excitation level 210 does not become saturated.

  Then, in the fluorescent light emitting display 100 of the present embodiment, as shown in FIG. 12C, when the third light emitting point 330 emits light, the first excitation level 210 is set to a saturated state so that the electron density of the first excited level 210 becomes saturated. The output of the light source 121 is temporarily increased from a predetermined output.

  According to such a configuration, the predetermined output can be reduced as compared with the above-described second embodiment, and the energy consumption of the first light source 121 can be suppressed. Further, the control of the first light source 121 can be simplified as compared with the first embodiment described above.

  As described above, the present embodiment has the following effects in addition to the effects of the first and second embodiments.

  (D) Regarding the light emitting points 310 and 320 near the first end face 112b of the display film 112, while maintaining the electron density of the first excited level 210 in a saturated state, the light emitting point 330 far from the first end face 112b is maintained. Saturates the electron density only during light emission. Therefore, it is not necessary to excessively increase the intensity of the first excitation light EL1 at the light emitting points 310 and 320 near the first end surface 112b, and the energy consumption of the first light source 121 can be suppressed. In addition, the load on each unit through which the first excitation light EL1 propagates is reduced, and the reliability of the fluorescent light emitting display 100 is improved.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIGS. 13 to 15C. This embodiment is an embodiment in which the attenuation of the first excitation light EL1 is complemented by the second excitation light EL2.

FIG. 13 is a flowchart illustrating a procedure of the first excitation light output processing according to the present embodiment. The configuration of the fluorescent light emitting display 100 according to the present embodiment is the same as that of the first embodiment except that the control contents of the first and second light sources 121 and 131 are different. The description of the configuration is omitted. Also, in the following, it will be described as an example the case of the light emitting point 300 on X ₂ rows in order.

  First, the first control unit 140 controls the first light source 121 to output the first excitation light EL1 with a predetermined output (step S501). Here, the predetermined output is, for example, an output in which the electron density of the first excitation level 210 does not become saturated at all the light emitting points 300.

Next, the first control unit 140 controls the first light distribution 122, introducing a first pumping light EL1 emitted from the first light source 121 to the first optical fiber 123 of the position _{X 2} (Step S502). Since the processing after step S502 is the same as the processing after step S302 in FIG. 9, the description of the processing after step S502 will be omitted.

As described above, according to the process of the flowchart shown in FIG. 13, the light emitting point 300 on X ₂ columns to emit light in sequence, the first excitation light EL1 is introduced repeatedly into the inside of the display film 112. At this time, the output of the first excitation light EL1 is adjusted so that the electron density of the first excitation level 210 does not become saturated at all the light emitting points 300.

  FIG. 14 is a flowchart illustrating the procedure of the second excitation light output processing according to the present embodiment.

First, the second control unit 150 sets n = 1 as a variable n of the light emission positions X ₂ and Y _n as a second light source control unit (step S601).

Next, the second control unit 150 recognizes the set luminance of the light emitting point 300 at the light emitting positions X ₂ and Y _n (Step S602).

Next, the second control unit 150 estimates the attenuation of the first excitation light EL1 at position _{Y n} (step S603). More specifically, the second control unit 150 refers to the predetermined map information, estimates the attenuation of the first excitation light EL1 at position Y _n.

Next, the second control unit 150 sets the output of the second light source 131 from the emission intensity characteristics of the emission point 300 corresponding to the intensities of the first and second excitation lights EL1 and EL2 (step S604). More specifically, first, the second control unit 150 performs the first control based on the set luminance recognized in the process shown in step S602 and the amount of attenuation of the first excitation light EL1 estimated in the process shown in step S603. The intensity of the second excitation light EL2 is set. The second control unit 150 refers to the map information showing a relation between the emission intensity of the first and second excitation light EL1, strength EL2 and the light emitting point 300, the emission point 300 of the position _X 2, _{Y n} The intensity of the second excitation light EL2 is set so that the luminance becomes the set luminance. Then, the second control unit 150 sets the output of the second light source 131 with reference to the predetermined map information.

  Next, the second control unit 150 controls the second light source 131 to output the second excitation light EL2 with the output set in the processing shown in step S604 (step S605). Since the processing after step S605 is the same as the processing after step S204 in FIG. 5, the description of the processing after step S605 will be omitted.

As described above, according to the process of the flowchart shown in FIG. 14, the light emitting point 300 on X ₂ columns to emit light in sequence, a second pumping light EL2 is introduced repeatedly into the inside of the display film 112. At this time, the amount of attenuation of the first excitation light EL1 at the light emitting point 300 is estimated, and the output of the second excitation light EL complements the amount of attenuation of the first excitation light EL1. The output is adjusted. Specifically, the output of the second light source 131 is adjusted so that the output from the second light source 131 increases as the distance from the first end surface 112b of the display film 112 to the light emitting point 300 increases.

  Next, with reference to FIGS. 15A to 15C, the operation and effect of the fluorescent light emitting display 100 according to the present embodiment will be described in detail.

  FIG. 15A is a diagram showing first and second light emitting points 310 and 320 on the display surface 112a of the fluorescent light emitting display 100. FIGS. 15B and 15C are diagrams showing states of electrons in the phosphor fine particles 111 at the first and second light emitting points 310 and 320. FIG. Hereinafter, a case where the set luminance of all the light emitting points 300 is the same will be described as an example.

  As shown in FIG. 15A, in the fluorescent light emitting display 100 of the present embodiment, the output of the second light source 131 is adjusted so that the attenuation of the first excitation light EL1 is complemented by the output of the second excitation light EL2. You. Specifically, when the second light emitting point 320 that is farther from the first end face 112b of the display film 112 than the first light emitting point 310 emits light, the output of the second light source 131 is increased.

  According to such a configuration, as shown in FIGS. 15B and 15C, even when the electron density of the first excitation level 210 differs between the first and second light emitting points 310 and 320, the second excitation level The electron density at the position 220 becomes the same. As a result, the luminance of the first and second light emitting points 310 and 320 becomes the same, and the luminance of the display surface 112a is made uniform.

  As described above, the present embodiment has the following effects in addition to the effects of the first to third embodiments.

  (E) Since the attenuation of the first excitation light EL1 is complemented by the second excitation light EL2 and the luminance of the light emitting points 300 is made uniform, the output of the first light source 121 is adjusted for each light emitting point 300. No need to do. In addition, since it is not necessary to increase the output of the first light source 121, the load on each unit through which the first excitation light EL1 propagates is reduced, and the reliability of the fluorescent light emitting display 100 is improved.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIGS. 16A to 16C. This embodiment is an embodiment implemented by combining the first embodiment and the fourth embodiment.

  FIGS. 16A to 16C are diagrams for explaining the operation and effect of the fluorescent light emitting display 100 according to the present embodiment. Hereinafter, a case where the set luminance of all the light emitting points 300 is the same will be described as an example.

  In the fluorescent light emitting display 100 of the present embodiment, a process of complementing the attenuation of the first excitation light EL1 by increasing the output of the first light source 121 and a process of increasing the output of the second light source 131. Are switched according to the position of the light emitting point 300.

  Specifically, as shown in FIG. 16A and FIG. 16B, for example, when the first and second light emitting points 310 and 320 that are close to the first end face 112b of the display film 112 emit light, the first light source 121 is used. Is adjusted to increase the intensity of the first excitation light EL1. On the other hand, as shown in FIG. 16C, when the third light emitting point 330 far from the first end surface 112b of the display film 112 is caused to emit light, the output of the second light source 131 is adjusted to adjust the second excitation light EL2. Increase the strength of.

  According to such a configuration, the process of reducing the energy consumption of the first and second light sources 121 and 131 is selected for each light emitting point 300 in accordance with the position of the light emitting point 300, so that the fluorescent light emitting display 100 Energy consumption can be minimized.

  As described above, the present embodiment described above has the following effects in addition to the effects of the first to fourth embodiments.

  (F) The process of complementing the attenuation of the first excitation light EL1 by increasing the output of the first light source 121 and the process of complementing the attenuation of the first excitation light EL1 by increasing the output of the second light source 131 are switched. The overall energy consumption of the display 100 can be minimized.

  As described above, the fluorescent light emitting display 100 of the present invention has been described in the first to fifth embodiments described above. However, it goes without saying that those skilled in the art can appropriately add, modify, and omit the present invention within the scope of the technical concept.

  For example, in the above-described second to fifth embodiments, the case where the fluorescent light emitting display 100 displays information in a single color has been described as an example. However, similarly to the modification of the first embodiment, in the second to fifth embodiments, the fluorescent light emitting display 100 may emit three colors of fluorescent light to display information in color.

  In the above-described first to fifth embodiments, the pumping light emitted from one light source is selectively transmitted to a plurality of optical fibers by the light distributor. However, a light source may be provided for each of the plurality of optical fibers, and the excitation light may be transmitted from each light source to the optical fiber without using a light distributor.

  In the above-described first to fifth embodiments, the case where the first excitation light and the second excitation light intersect in a two-dimensional plane to display information two-dimensionally has been described as an example. However, for example, a display unit is constituted by a cubic display medium in which phosphor fine particles are dispersed and held, and information is three-dimensionally scanned by scanning the first and second excitation lights in the vertical direction (Z direction). It may be displayed.

  In the above-described first to fifth embodiments, the case where the phosphor fine particles are excited by two excitation lights to emit light has been described as an example. However, the present invention is also applicable to a case where phosphor fine particles emit light by three or more excitation lights. For example, when the phosphor fine particles are excited by three excitation lights to emit light, the electron density of the first excitation level is made the same between the emission points, or the attenuation of the first excitation light is reduced by the remaining excitation light. Complement with output.

100 fluorescent light emitting display (display device),
110 display unit,
111 phosphor fine particles (luminous body),
112 display film (display medium),
112a display surface,
112b first end surface (light incident surface);
112c second end face,
120 a first light source unit,
121 first light source,
122 first light distributor,
123 first optical fiber,
124 first collimator lens (first introduction member),
130 second light source unit,
131 second light source,
132 second light distributor,
133 second optical fiber,
134 second collimator lens (second introduction member),
140 first control unit (control section, first light source control section)
150 second control unit (second light source control unit);
200 ground levels,
210 first excitation level,
220 second excitation level,
300, 310, 320, 330 emission points,
EL1 first excitation light,
EL2 second excitation light,
RL1 fluorescence.

Claims (5)

Excited by a first excitation light that excites electrons of a ground level to a first excitation level and a second excitation light that excites electrons of the first excitation level to a second excitation level A display medium holding a fluorescent light-emitting body dispersed therein,
A first light source that emits the first excitation light;
A first introduction member arranged in a plurality in a first direction and introducing the first excitation light emitted from the first light source into the display medium;
A second light source that emits the second excitation light;
A second introduction member arranged in a plurality of second directions intersecting the first direction and introducing the second excitation light emitted from the second light source into the display medium;
Regarding a plurality of light-emitting points formed at intersections of the first excitation light and the second excitation light, the first light-emitting points are arranged between a plurality of light-emitting points arranged in a traveling direction of the first excitation light. A control unit that adjusts the output of the first light source so that the electron density of the excitation level becomes the same;
A display device having:   The control unit is configured to control the first light source so that the output of the first light source increases as the distance from the light incident surface of the display medium on which the first excitation light is incident to the light emitting point increases. The display device according to claim 1, wherein an output of the display device is adjusted.   The control unit controls the output of the first light source such that the electron density of the first excitation level is saturated at the plurality of light emitting points arranged in the traveling direction of the first excitation light. The display device according to claim 1, wherein the display device is adjusted. Excited by a first excitation light that excites electrons of a ground level to a first excitation level and a second excitation light that excites electrons of the first excitation level to a second excitation level A display medium holding a fluorescent light-emitting body dispersed therein,
A first light source that emits the first excitation light;
A first introduction member arranged in a plurality in a first direction and introducing the first excitation light emitted from the first light source into the display medium;
A second light source that emits the second excitation light;
A second introduction member arranged in a plurality of second directions intersecting the first direction and introducing the second excitation light emitted from the second light source into the display medium;
When emitting a light-emitting point formed at the intersection of the first excitation light and the second excitation light, the attenuation of the first excitation light traveling inside the display medium is reduced by the second excitation light. A second light source control unit that adjusts an output of the second light source so as to complement with light,
A display device having:   The output of the first light source is adjusted such that the output of the first light source increases as the distance from the light incident surface of the display medium on which the first excitation light is incident to the light emitting point increases. The display device according to claim 4, further comprising a first light source control unit.