JP2010250992A - Lighting device, display device, and electronic equipment having display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device capable of restraining generation of luminance unevenness. <P>SOLUTION: The lighting device 10 has a light source section 1, a light guide member 2 guiding near-ultraviolet light irradiated from the light source section 1, and light-emitting sections 3 arranged on the surface of the light guide member 2 and including phosphor layers which make surface light-emission by near-ultraviolet light guided with the light guide member 2. Phosphor layers of respective light-emitting sections 3 include red phosphor layers 3a, green phosphor layers 3b, and blue phosphor layers 3c, and are formed so as to irradiate white light by creating the white light by red light, green light, and blue light irradiated from respective phosphors light-emitted by the near-ultraviolet light. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an illumination device, a display device, and an electronic device including the display device, and more particularly to an illumination device, a display device, and an electronic device including a light guide member that guides light emitted from a light source.

  Conventionally, an illuminating device including a light guide member that guides light emitted from a light source has been disclosed (see, for example, Patent Document 1). The illumination device (front light) of Patent Document 1 includes a light emitting diode that emits white light as a light source, and a light guide plate that guides white light from the light emitting diode to the irradiation surface side. In this front light, one surface of the light guide plate is formed into a flat surface, and the other surface of the light guide plate has an inclined portion for reflecting white light emitted from the light emitting diode to one surface side. A plurality of are formed. And it is comprised so that the white light radiate | emitted from the light emitting diode which propagates the inside of a light-guide plate may be reflected by the inclination part of the other surface side of a light-guide plate, and may be radiate | emitted to one surface side (irradiation surface side). .

JP 2000-193972 A

  However, the front light (illumination device) disclosed in Patent Document 1 is configured so that white light emitted from the light emitting diode is directly emitted from the irradiation surface as a light source from the front light. When the light having the directivity is used as the light source, there is a problem in that uneven brightness may occur partially.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to provide an illumination device, a display device, and an electronic apparatus that can suppress the occurrence of luminance unevenness. Is to provide.

Means for Solving the Problems and Effects of the Invention

  An illumination device according to a first aspect of the present invention is provided on a light source, a light guide member that guides light emitted from the light source, and a surface of the light guide member, and emits light by the light guided by the light guide member. A light emitting unit including a phosphor layer, the light emitted from the light source is composed of near ultraviolet light or blue light, and when the light emitted from the light source is near ultraviolet light, the phosphor layer is red, A red phosphor layer, a green phosphor layer and a blue phosphor layer emitting surface light in green and blue, respectively, and a red phosphor, a green phosphor and a red phosphor irradiated from the red phosphor layer, the green phosphor layer and the blue phosphor layer; When the light emitted from the light source is blue light, the phosphor layer is composed of a red phosphor layer and a green phosphor that emit light in red and green, respectively. Red phosphor including body layer And the red light and green light emitted from the green phosphor layer, and is configured to irradiate to generate white light by the blue light from the light source.

  In the illuminating device according to the first aspect, as described above, the light source including the phosphor layer that emits light by the light from the light source is provided, so that light having directivity such as a light emitting diode is emitted from the light source from the illuminating device. Unlike the case of directly irradiating to the outside, it is possible to irradiate the surface-emitting light through the phosphor layer, so that it is possible to suppress the occurrence of uneven brightness in the light from the lighting device. Further, the temperature quenching is achieved by generating the three colors of light, red light, green light and blue light for generating white light by irradiating the phosphor layer with light emitted from the light source. For example, white light can be generated without reducing the light intensity during color conversion. That is, in the past, white light may be generated by two colors of blue and orange converted from blue by a light emitting diode. In this case, the light intensity decreases due to temperature rise when converting from blue to orange. The light intensity decreases during color conversion due to the influence of temperature quenching. On the other hand, in the present invention, since the light from the light source is converted by the phosphor layer, white light can be generated without reducing the light intensity during color conversion due to temperature quenching or the like. it can.

  In the first aspect, when the light source is configured to irradiate near ultraviolet light, the phosphor layer of the light emitting unit is configured by a red phosphor layer, a green phosphor layer, and a blue phosphor layer, and the light source In this case, the phosphor layer of the light emitting part is composed of a red phosphor layer and a green phosphor layer. In any case, the fluorescence corresponding to red, green and blue is used. White light is generated by the three colors of light emitted from the body layer or the three colors of light emitted from the phosphor layers corresponding to red and green and the blue light from the light source. Constitute. Here, for example, when a conventional illumination device that generates white light by blue and orange is applied to a display device having a color filter, the conventional illumination device generates white light by blue and orange. Since the red wavelength is only small (does not have a single red peak wavelength), when white light passes through the red color filter of the display device, light having the desired red wavelength is not emitted and the color Reproducibility may be reduced. On the other hand, when the illumination device of the present invention is applied to a display device having a color filter, each of the light sources of the illumination device has a single peak regardless of whether the light source is near ultraviolet light or blue light. White light is generated by light of three colors of red, green and blue having wavelengths. Therefore, when the white light from the illumination device passes through the color filter of the display device, the white light has a single peak wavelength of red, so that a desired red color can be generated. That is, it can suppress that color reproducibility falls. In addition, when the light from the light source is blue light, it can be used as light for directly generating white light without converting the light from the light source by the phosphor layer. Can be suppressed.

  In the illumination device according to the first aspect, preferably, a plurality of light emitting portions are arranged in an island shape on the surface of the light guide member, and at least one phosphor layer of each color phosphor layer of the plurality of light emitting portions. The plane area is different from the plane areas of the phosphor layers of other colors. If comprised in this way, the intensity balance of each color can be adjusted easily.

  In the illumination device according to the first aspect, preferably, a plurality of light emitting units are arranged in an island shape on the surface of the light guide member, and among the plurality of light emitting units, the fluorescence of each color of the light emitting unit disposed in the vicinity of the light source. Compared with the body layer, the phosphor layer of each color of the light emitting unit arranged at a position where the distance from the light source is larger is configured to have a larger plane area. With this configuration, the phosphor layer arranged at a position where the distance from the light source is large is smaller in amount of light than the phosphor layer arranged in the vicinity of the light source, but is arranged in the vicinity of the light source. Since the plane area is larger than that of the phosphor layer, the light incident range on the phosphor layer can be increased. That is, by changing the plane area of the phosphor layer according to the distance from the light source, the phosphor layer having a large distance from the light source and the phosphor layer disposed in the vicinity of the light source can emit light with substantially the same luminance. . Therefore, it is possible to further suppress luminance unevenness of light emitted from the lighting device.

  In the illumination device according to the first aspect described above, preferably, the illumination device further includes a light shielding layer provided for each light emitting unit and provided on the side opposite to the side facing the light guide member of the light emitting unit, and provided in each light emitting unit. The obtained light shielding layers have substantially the same plane area. With this configuration, for example, when the lighting device is applied as a front light of a reflective display device, the light reflected by the reflective display device is illuminated regardless of the distance from the light source when transmitted through the lighting device. Since the flat area of all the light shielding layers of the device is approximately the same size, the flat area of the light shielding layer is increased, unlike the case where the light shielding layer is configured to have a larger planar area according to the distance from the light source. As a result, it is possible to prevent more reflected light from the display device from being blocked.

  In the lighting device according to the first aspect, preferably, a plurality of light emitting units are arranged in an island shape on the surface of the light guide member, and each of the plurality of light emitting units corresponds to one color for each light emitting unit. A phosphor layer is disposed. If comprised in this way, when the light from a light source will inject into a light emission part, any one color of red, green, and blue can be light-emitted easily from each light emission part.

  In the lighting device according to the first aspect, preferably, a plurality of light emitting units are arranged in an island shape on the surface of the light guide member, and each of the plurality of light emitting units corresponds to a plurality of colors for each light emitting unit. A phosphor layer is disposed. If comprised in this way, when the light from a light source will inject into a light emission part, a several color can be easily irradiated from each light emission part.

  In the illumination device according to the first aspect, preferably, when the light emitted from the light source is near-ultraviolet light, the light guide member and the light emitting unit are provided to cover the light guide member and the light emitting unit of the light guide member is disposed. It further includes a filter member for suppressing near-ultraviolet light from being emitted from the surface on the side. If comprised in this way, it can suppress that near ultraviolet light radiate | emits outside by a filter member, Therefore It can suppress that an near observer is irradiated with near ultraviolet light.

  In the illumination device according to the first aspect described above, preferably, when the light emitted from the light source is blue light, the light guide member is formed on the surface on the side where the phosphor layer is disposed, and the blue light from the light source is emitted. The groove part for reflecting so that it may go to the opposite side to the side by which the fluorescent substance layer of a light guide member is arrange | positioned is included. If comprised in this way, the emission direction of blue light can be easily turned to the same direction as the red light and green light irradiated from a fluorescent substance layer.

  A display device according to a second aspect of the present invention is provided on a light source, a light guide member that guides light emitted from the light source, and a surface of the light guide member, and emits light by the light guided by the light guide member. The illumination unit includes a light emitting unit having a phosphor layer, and a display unit that reflects and displays light emitted from the illumination unit, and the light emitted from the light source of the illumination unit is near ultraviolet light or blue When the light emitted from the light source of the illumination unit is near-ultraviolet light, the phosphor layer has a red phosphor layer, a green phosphor layer, and a blue phosphor that emit light in red, green, and blue, respectively. Layer, and configured to generate and emit white light by red light, green light and blue light emitted from the red phosphor layer, green phosphor layer and blue phosphor layer, and from the light source of the illumination unit When the irradiated light is blue light, the phosphor layer is Including red and green phosphor layers emitting surface light in red and green respectively, white light is emitted by red light and green light emitted from the red phosphor layer and green phosphor layer and blue light from the light source Is generated and irradiated.

  In the display device according to the second aspect, as described above, the light source including the phosphor layer that emits light by the light from the light source is provided, so that light having directivity such as a light emitting diode is emitted from the light source from the illumination unit. Unlike the case of irradiating the display unit, it is possible to irradiate the surface emitting light through the phosphor layer, so that it is possible to suppress the occurrence of uneven brightness in the light from the illumination unit. In addition, it is caused by temperature quenching, etc. by constructing the phosphor layer to generate light of three colors of red light, green light and blue light for generating white light. Thus, white light can be generated without reducing the light intensity during color conversion. That is, conventionally, there are cases where white is generated by two colors of blue emitted from a light emitting diode and orange converted from blue by a phosphor layer provided inside the light emitting diode. When converted to, light intensity may decrease due to temperature rise (temperature quenching). On the other hand, the illumination unit according to the present invention is configured to convert light from the light source by the phosphor layer, so that white light is generated without reducing the light intensity during color conversion due to temperature quenching or the like. can do.

  Further, in the second aspect, when configured to irradiate near ultraviolet light from the light source of the illumination unit, the phosphor layer of the light emitting unit is configured by a red phosphor layer, a green phosphor layer, and a blue phosphor layer. However, when the light source of the illumination unit is configured to emit blue light, the phosphor layer of the light emitting unit is composed of a red phosphor layer and a green phosphor layer, and in either case, red, green And three colors of light emitted from the phosphor layer corresponding to blue or three colors of light composed of two colors of light emitted from the phosphor layer corresponding to red and green and blue from the light source. Configure to generate light. Here, for example, when a conventional illumination unit that generates white light by blue and orange is applied to a display unit having a color filter, the conventional illumination unit generates white light by blue and orange. Since the red wavelength is small (does not have a single red peak wavelength), when white light passes through the red color filter of the display unit, light having a desired red wavelength is not emitted, and the color Reproducibility may be reduced. On the other hand, when a color filter is provided in the display unit of the present invention, red light having a single peak wavelength is used regardless of whether the light source of the illumination unit is near ultraviolet light or blue light. White light is generated by light of three colors, green and blue. Therefore, when the white light from the illumination unit passes through the color filter of the display unit, the white light has a single peak wavelength of red, so that a desired red color can be generated. That is, it can suppress that color reproducibility falls. In addition, when the light from the light source is blue light, it can be used as light for directly generating white light without converting the light from the light source by the phosphor layer. Can be suppressed.

  In the display device according to the second aspect, the display unit includes a reflective liquid crystal display device including a reflective layer that reflects light emitted from the illumination unit and a liquid crystal layer. If comprised in this way, the reflective liquid crystal display device which uses as a light source the white light produced | generated by the light of three colors which has each single peak length of red, green, and blue in an illumination part can be comprised easily. it can.

  In the display device according to the second aspect, the display unit includes an electrophoretic display device. If comprised in this way, the electrophoretic display apparatus which uses as a light source the white light produced | generated by the light of three colors which has each single peak length of red, green, and blue in an illumination part can be comprised easily. .

  An electronic apparatus according to a third aspect of the present invention includes a display device having the above-described configuration. If comprised in this way, the electronic device containing the display apparatus which can suppress that a brightness | luminance nonuniformity generate | occur | produces can be obtained.

It is sectional drawing of the display apparatus provided with the illuminating device by 1st Embodiment of this invention. It is an expanded sectional view of the illuminating device by 1st Embodiment of this invention. It is a top view of the illuminating device by 1st Embodiment of this invention. It is sectional drawing for demonstrating the structure of the illuminating device by 1st Embodiment of this invention. It is sectional drawing for demonstrating the display apparatus provided with the illuminating device by 1st Embodiment of this invention. It is sectional drawing of the display apparatus provided with the illuminating device by 2nd Embodiment of this invention. It is an expanded sectional view of the illuminating device by 2nd Embodiment of this invention. It is a top view of the illuminating device by 2nd Embodiment of this invention. It is sectional drawing for demonstrating the display apparatus provided with the illuminating device by 2nd Embodiment of this invention. It is sectional drawing of the display apparatus provided with the illuminating device by 3rd Embodiment of this invention. It is a perspective view for demonstrating the electronic device by the 1st example provided with the display apparatus containing the illuminating device by 1st-3rd embodiment of this invention. It is a perspective view for demonstrating the electronic device by the 2nd example provided with the display apparatus containing the illuminating device by 1st-3rd embodiment of this invention. It is a perspective view for demonstrating the electronic device by the 3rd example provided with the display apparatus containing the illuminating device by 1st-3rd embodiment of this invention. It is an expanded sectional view of the illuminating device by the modification of 1st and 3rd embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
With reference to FIGS. 1-5, the structure of the display apparatus 100 by 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the display device 100 according to the first embodiment of the present invention includes a front light type illumination unit 10 and a reflective liquid crystal display unit 20. The illumination unit 10 is an example of the “illumination device” in the present invention. The reflective liquid crystal display unit 20 is an example of the “display unit” and “reflective liquid crystal display device” in the present invention.

  As shown in FIGS. 1 to 3, the illumination unit 10 includes a light source unit 1 and a light guide member 2 that guides light emitted from the light source unit 1. In the first embodiment, the light source unit 1 is configured to emit near-ultraviolet light having a wavelength of 360 nm or more and 380 nm or less. Moreover, the light guide member 2 is formed in a flat surface shape in plan view, and the light source unit 1 extends along one end of the light guide member 2 (see FIG. 3), and the light guide member 2. It is arranged to be adjacent to. The light source unit 1 is an example of the “light source” in the present invention.

  Here, in the first embodiment, on the surface of the light guide member 2 (on the surface on the arrow Z2 side), the plurality of light emitting units 3 are arranged in an island shape with a predetermined interval. Each light emitting unit 3 includes any one of a red phosphor layer 3a corresponding to red, a green phosphor layer 3b corresponding to green, and a blue phosphor layer 3c corresponding to blue, The light shielding layer 3d is formed so as to cover the phosphor layer. The red phosphor layer 3a, the green phosphor layer 3b, and the blue phosphor layer 3c are configured to emit light in red, green, and blue, respectively, when near-ultraviolet light irradiated from the light source unit 1 is incident. ing. The light shielding layer 3d is made of, for example, chromium oxide and is formed for each phosphor layer. Further, the light shielding layer 3d has a function as a reflection layer that reflects light directed in the arrow Z2 direction in the light emitted from each phosphor layer in the arrow Z1 direction.

  As a result, as shown in FIG. 2, the three colors of red, green, and blue emitted from the surface emitting red phosphor layer 3a, green phosphor layer 3b, and blue phosphor layer 3c in the direction of the arrow Z1, respectively. White light is generated by the light. Then, the generated white light is configured to be emitted toward the reflective liquid crystal display unit 20 as a light source of the illumination unit 10.

  In the first embodiment, as shown in FIGS. 3 and 4, the red phosphor layer 3a, the green phosphor layer 3b, the blue phosphor layer 3c, and the light shielding layer 3d are substantially square-shaped when viewed in a plan view. The light shielding layers 3d provided in the respective light emitting portions 3 have substantially the same plane area S1 (width W1). On the other hand, among the respective light emitting units 3, from the plane area S2 (width W2) of the red phosphor layer 3a, the green phosphor layer 3b, and the blue phosphor layer 3c of the light emitting unit 3 disposed in the vicinity of the light source unit 1. Also, the planar area S3 (width W3) of the red phosphor layer 3a, the green phosphor layer 3b, and the blue phosphor layer 3c of the light emitting unit 3 disposed at a position where the distance from the light source unit 1 becomes large is increased. It is configured.

  A filter member 4 is formed on the surfaces of the light guide member 2 and the light emitting unit 3 so as to cover the light guide member 2 and the light emitting unit 3. The filter member 4 has a function of suppressing near-ultraviolet light propagating through the light guide member 2 from leaking from the light guide member 2 toward the arrow Z2 direction side (observer side).

  Further, between the light guide member 2 and the reflective liquid crystal display unit 20, light emitted from the red phosphor layer 3a, the green phosphor layer 3b, and the blue phosphor layer 3c is in the direction of the arrow Z1 of the light guide member 2. A reflection suppressing film 5 is formed to suppress reflection at the interface between the surface on the side and the reflective liquid crystal display unit 20 side.

  Next, the configuration of the reflective liquid crystal display unit 20 will be described with reference to FIG. The reflective liquid crystal display unit 20 includes a pair of glass substrates 21a and 21b, and a plurality of switching thin film transistors (TFTs) 22 are formed on the surface of the glass substrate 21a. An interlayer insulating film 23 having an uneven shape is formed on the surface of the thin film transistor 22, and a reflective layer 24 is formed on the surface of the interlayer insulating film 23 so as to reflect the uneven shape of the interlayer insulating film 23. ing. A pixel electrode 25 is formed on the surface of the reflective layer 24 so as to correspond to each thin film transistor 22. The thin film transistor 22 and the pixel electrode 25 are connected through a contact hole 26 formed in the interlayer insulating film 23 and the reflective layer 24. The reflective layer 24 is made of a reflective material such as aluminum, and has a function of reflecting light incident from the illumination unit 10 to the viewer side (arrow Z2 direction side). The pixel electrode 25 is made of a transparent electrode such as ITO.

  Further, on the surface of the glass substrate 21b facing the glass substrate 21a (arrow Z1 direction side), the color filter 27a corresponding to red and the color filter corresponding to green are arranged at positions corresponding to the respective pixel electrodes 25. Color filters 27c corresponding to 27b and blue are formed. An overcoat layer 28 is formed on the surfaces of the color filters 27a, 27b and 27c, and a counter electrode 29 made of a transparent electrode is formed on the surface of the overcoat layer 28. Moreover, the phase difference plate 30 and the polarizing plate 31 are formed on the surface of the glass substrate 21b on the arrow Z2 direction side. A liquid crystal 40 is filled between the glass substrate 21a and the glass substrate 21b. The reflective liquid crystal display unit 20 and the illumination unit 10 are mutually connected by an adhesive layer (not shown) provided between the polarizing plate 31 of the reflective liquid crystal display unit 20 and the reflection suppression film 5 of the illumination unit 10. It is glued.

  With the above configuration, in the first embodiment, the red phosphor layer 3a, the green phosphor layer 3b, and the blue phosphor layer 3c are surface-emitted by near ultraviolet light emitted from the light source unit 1 of the illumination unit 10, and these White light emitted in a planar shape is generated by the three colors of surface-emitting light. And it is comprised so that the white light from the illumination part 10 may be irradiated to the arrow Z2 side (observer side) through the color filters 27a, 27b, and 27c. In the reflective liquid crystal display unit 20 configured by the vertical electric field type driving method, driving methods such as an ECB mode, a VA mode, and a TN mode can be applied.

  In the first embodiment, as described above, a light emitting diode is provided by including the light emitting unit 3 including the red phosphor layer 3a, the green phosphor layer 3b, and the blue phosphor layer 3c that emits light by the light from the light source unit 1. Unlike the case of directly irradiating light having directivity such as the light source from the illumination unit to the outside, it is possible to irradiate the surface emitting light through each phosphor layer, so that the light from the illumination unit 10 has luminance. Generation of unevenness can be suppressed. In addition, by irradiating the phosphor layers (3a to 3c) with near-ultraviolet light emitted from the light source unit 1, light of three colors of red light, green light, and blue light for generating white light is generated. With this configuration, white light can be generated without a decrease in light intensity during color conversion due to temperature quenching or the like. That is, conventionally, there are cases where white is generated by two colors of blue emitted from a light emitting diode and orange converted from blue by a phosphor layer provided inside the light emitting diode. When the color is converted from orange to orange, the light intensity may decrease due to temperature increase (temperature quenching). On the other hand, in 1st Embodiment, since it is the structure which converts the light from the light source part 1 by a fluorescent substance layer (3a-3c), light intensity falls at the time of color conversion resulting from temperature quenching etc. White light can be generated without any problem.

  In the first embodiment, the light source unit 1 is configured to emit near-ultraviolet light, and the phosphor layers of the light emitting unit 3 are the red phosphor layer 3a, the green phosphor layer 3b, and the blue phosphor layer 3c. The white light is generated by the three colors of light emitted from the phosphor layers corresponding to red, green and blue. Here, for example, when a conventional lighting device that generates white light by blue and orange is applied to a light source of a display device having a color filter, the conventional lighting device generates white light by blue and orange. Therefore, when the white light passes through the red color filter of the display device, the light having the desired red wavelength is emitted. In some cases, color reproducibility may deteriorate. On the other hand, since the illumination unit 10 in the first embodiment is configured to generate white light using light of three colors of red, green, and blue, each having a single peak wavelength, white light from the illumination unit 10 is generated. When the light passes through the color filter 27a of the reflective liquid crystal display unit 20, the white light has a red single peak wavelength, so that a desired red color can be generated. That is, it can suppress that color reproducibility falls.

  Moreover, in the said 1st Embodiment, it arrange | positions in the position where the distance from the light source part 1 becomes large compared with the fluorescent substance layer of each color of the light emission part 3 arrange | positioned in the light source part 1 vicinity among the several light emission parts 3. FIG. By arranging the phosphor layers of the respective colors of the light emitting unit to have a larger plane area, the phosphor layer arranged at a position where the distance from the light source unit 1 is larger is arranged in the vicinity of the light source unit 1. The amount of light reaching the phosphor layer is smaller than that of the phosphor layer. On the other hand, the incident area of the light on the phosphor layer is increased by the larger plane area than the phosphor layer disposed in the vicinity of the light source unit 1. Can do. That is, by changing the plane area of the phosphor layer according to the distance from the light source unit 1, the phosphor layer having a large distance from the light source unit 1 and the phosphor layer disposed in the vicinity of the light source unit 1 have substantially the same luminance. Can emit light. Therefore, the brightness unevenness of the light irradiated from the illumination unit 10 can be further suppressed.

  Moreover, in the said 1st Embodiment, while providing the light shielding layer 3d in the opposite side to the side facing the light guide member 2 of the light emission part 3, the light shielding layer 3d provided in each light emission part 3 is substantially the same plane area. With this configuration, when the light reflected by the reflective display unit 20 is transmitted through the illumination unit 10, the planar area of all the light shielding layers 3 d of the illumination unit 10 regardless of the distance from the light source unit 1. Are substantially the same size, unlike the case where the planar area of the light shielding layer 3d is increased according to the distance from the light source unit 1, the reflection is caused by the increase in the planar area of the light shielding layer 3d. It is possible to prevent more reflected light from the mold display unit 20 from being blocked.

  In the first embodiment, a plurality of light emitting units 3 are arranged in an island shape on the surface of the light guide member 2, and a phosphor layer corresponding to one color is arranged for each light emitting unit 3. Thus, when light from the light source unit 1 is incident on the light emitting unit 3, each of the light emitting units 3 can easily emit any one of red, green, and blue colors.

  Moreover, in the said 1st Embodiment, the filter member 4 for suppressing that near ultraviolet light radiate | emits from the surface by the side of the arrow Z2 of the light guide member 2 is provided so that the light guide member 2 and the light emission part 3 may be covered. Thereby, since it can suppress that near ultraviolet light radiate | emits outside by the filter member 4, it can suppress that an external observer is irradiated with near ultraviolet light.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. The second embodiment differs from the first embodiment in which white light is generated by the light source unit 1 that emits near-ultraviolet light and the phosphor layers corresponding to red, green, and blue. An example in which white light is generated by the light source unit 201 that emits light and the phosphor layers corresponding to red and green will be described.

  As shown in FIGS. 6 to 8, the display device 200 according to the second embodiment of the present invention includes a front light type illumination unit 210 and an electrophoretic display unit 220. The electrophoretic display unit 220 is an example of the “display unit” and “electrophoretic display device” in the present invention.

  In 2nd Embodiment, the light irradiated from the light source part 201 of the illumination part 210 is comprised by the blue light by the single peak wavelength radiate | emitted from a blue light emitting diode etc., for example. On the surface of the light guide member 202, a light emitting portion 203 including a red phosphor layer 203a and a light shielding layer 203d, a light emitting portion 203 including a green phosphor layer 203b and a light shielding layer 203d, and a groove portion 204 are arranged in this order. It is formed in an island shape so as to be arranged in plurality. The groove 204 has a function of reflecting blue light propagating through the light guide member 202 in the direction of the arrow Z1 (see FIG. 7).

  As described above, the illumination unit 210 according to the second embodiment is configured so that the blue light emitted from the light source unit 201 is incident on the red phosphor layer 203a and the green phosphor layer 203b, and then from the red phosphor layer 203a and the green phosphor layer 203b. Are configured such that red light and green light are irradiated in the direction of the arrow Z1. At this time, the blue light is reflected by the groove portion 204 toward the arrow Z1 direction. Accordingly, white light is generated by the three colors of red, green, and blue light directed in the direction of the arrow Z1, and the white light is emitted toward the electrophoretic display unit 220.

  In the second embodiment, as shown in FIG. 8, the groove portion 204 is formed in a substantially square shape when seen in a plan view, and the groove portion provided in the vicinity of the light source portion 201 in each groove portion 204. The flat area S5 (width W5) of the groove part 204 provided at a position where the distance from the light source part 201 becomes larger than the flat area S4 (width W4) of 204 is configured to be larger.

  Next, the configuration of the electrophoretic display unit 220 will be described with reference to FIG. The electrophoretic display unit 220 includes a pair of glass substrates 221a and 221b, and a plurality of switching thin film transistors (TFTs) 222 are formed on the surface of the glass substrate 221a. An interlayer insulating film 223 is formed on the surface of the thin film transistor 222, and electrodes 224 are formed on the surface of the interlayer insulating film 223 so as to correspond to the respective thin film transistors 222. Each thin film transistor 222 and electrode 224 are connected via a contact hole 223 a formed in the interlayer insulating film 223.

  Further, color filters 227a, 227b, and 227c corresponding to red, green, and blue are formed on the surface of the glass substrate 221b that faces the glass substrate 221a (arrow Z1 direction side), and the color filters 227a, 227a, Overcoat layer 228 is formed to cover 227b and 227c. An electrode 229 is formed on the surface of the overcoat layer 228.

  In addition, a plurality of microcapsules 231 each having an electrophoretic dispersion 230 sealed therein are disposed between the electrodes 224 and 229, and each microcapsule 231 is fixedly held by a binder 232. . In the second embodiment, the electrophoretic dispersion liquid 230 in each microcapsule 231 is configured in a state where two types of electrophoretic particles of colored particles 230a and white particles 230b are dispersed by the liquid phase dispersion medium 230c. Yes. Thus, when an electric field is generated between the electrode 224 and the electrode 229, one of the colored particles 230a and the white particles 230b moves to the electrode 224 side, and the other particle moves to the electrode 229 side. It is configured.

  In the second embodiment, as described above, white light is emitted by three colors of light, red light and green light emitted by the red phosphor layer 203a and the green phosphor layer 203b, and blue light emitted by the light source unit 201. In the case of generating the light, it is possible to irradiate the illumination unit 210 with uniform light without unevenness of brightness and generate white light without reducing the light intensity at the time of color conversion due to temperature quenching or the like. Can do.

  In the second embodiment, even when the light source unit 201 is configured to emit blue light, the illumination unit 210 uses red, green, and blue light having a single peak wavelength to emit red light. Since white light having a single peak wavelength is generated, a desired red color can be generated. That is, it can suppress that color reproducibility falls.

  In the second embodiment, since the blue light from the light source unit 201 can be used as light for directly generating white light without being converted by the phosphor layer, the light intensity is reduced by the conversion. Can be suppressed.

  In the second embodiment, the light guide member 202 is formed with a groove portion 204 for reflecting the blue light from the light source unit 201 toward the arrow Z1 direction side of the light guide member 202, thereby emitting blue light. The direction can be easily directed in the same direction as the red light and green light emitted from the phosphor layer.

  The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. The third embodiment is different from the first embodiment in which any one of the red phosphor layer 3a, the green phosphor layer 3b, and the blue phosphor layer 3c is provided for each light emitting unit 3. Differently, an example in which a red phosphor layer 303a, a green phosphor layer 303b, and a blue phosphor layer 303c are provided for each light emitting unit 303 will be described.

  In the illumination unit 310 in the display device 300 according to the third embodiment of the present invention, as shown in FIG. 10, a plurality of light emitting units 303 are provided on the surface of the light guide member 2 in the same manner as in the first embodiment. The islands are arranged at intervals. Each light emitting unit 303 is provided with three phosphor layers, a red phosphor layer 303a, a green phosphor layer 303b, and a blue phosphor layer 303c, and a light shielding layer 303d. The light source unit 1 is configured to irradiate near ultraviolet light. When near-ultraviolet light is irradiated from the light source unit 1, the three phosphor layers emit light in red, green, and blue in each light emitting unit 303, and white light is emitted by these three colors of light. Is configured to be generated. And it is comprised so that the produced | generated white light may be irradiated toward the reflective liquid crystal display part 20 side (arrow Z1 side).

  The remaining configuration of the third embodiment is similar to that of the aforementioned first embodiment.

  In the third embodiment, as described above, even when the red phosphor layer 303a, the green phosphor layer 303b, and the blue phosphor layer 303c are provided for each of the light emitting units 303, Since each of the light emitting units 303 can emit red light, green light, and blue light by surface light emission using ultraviolet light, the illumination unit 310 can irradiate uniform light without unevenness, and can be used for temperature quenching or the like. As a result, white light can be generated without a decrease in light intensity during color conversion. Further, when near-ultraviolet light from the light source unit 1 is incident on the light emitting unit 303, light of three colors of red, green, and blue can be easily emitted from each light emitting unit 303.

  The remaining effects of the third embodiment are similar to those of the aforementioned first and second embodiments.

  Next, electronic devices according to first to third examples using the display devices 100, 200, and 300 according to first to third embodiments of the present invention will be described with reference to FIGS.

  As shown in FIGS. 11 to 13, the display devices 100, 200 and 300 according to the first to third embodiments of the present invention include a PC (Personal Computer) 400 according to the first example and a mobile phone 410 according to the second example. And it is possible to use for the information portable terminal 420 (PDA: Personal Digital Assistants) by the 3rd example. In the PC 400 according to the first example of FIG. 11, the display devices 100, 200, and 300 according to the first to third embodiments of the present invention can be used for the input unit 400a such as a keyboard and the display screen 400b. In the mobile phone 410 according to the second example of FIG. 12, the display devices 100, 200 and 300 according to the first to third embodiments of the present invention are used for the display screen 410a. In the information portable terminal 420 according to the third example of FIG. 13, the display devices 100, 200 and 300 according to the first to third embodiments of the present invention are used for the display screen 420a.

  The embodiment disclosed this time is illustrative in all points and is not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first and third embodiments, an example in which a reflective liquid crystal display unit is used as the display unit in the present invention is shown, and in the second embodiment, an example in which an electrophoretic display unit is used as the display unit in the present invention. Although shown, the present invention is not limited to this. That is, the electrophoretic display unit may be applied to the configuration of the first and third embodiments, or the reflective liquid crystal display unit may be applied to the configuration of the second embodiment. Further, as the display unit, a display unit other than the reflective liquid crystal display unit and the electrophoretic display unit may be used.

  Moreover, in the said 1st-3rd embodiment, although the example which provides a light emission part and a groove part so that it might become island shape seeing planarly was shown, this invention is not limited to this, A light emission part and a groove part, For example, when forming in a line shape, it may be formed other than an island shape.

  In the first and third embodiments, the example in which the reflection type liquid crystal display unit by the vertical electric field type driving method is applied to the display unit of the present invention is shown. However, the present invention is not limited to this, and the FFS mode and A reflective liquid crystal display unit using a lateral electric field type driving method such as an IPS mode may be applied.

  In the first to third embodiments, the example in which the light shielding layer is formed of metal is shown. However, the present invention is not limited to this, and the light shielding layer may be formed of resin.

  Moreover, in the said 1st-3rd embodiment, although the example which forms a light emission part and a groove part in an island shape at predetermined intervals was shown, this invention is not limited to this, A light emission part and a groove part are equally spaced. It is not necessary to arrange in.

  Moreover, in the said 2nd Embodiment, although the example which provides a light shielding layer only on the surface of a fluorescent substance layer was shown, this invention is not restricted to this but on the surface of a groove part in addition to the surface of a fluorescent substance layer. A light shielding layer may be provided.

  In the third embodiment, an example in which three phosphor layers corresponding to red, green, and blue are provided in each light emitting unit has been described. However, the present invention is not limited thereto, and each light emitting unit includes, for example, Two phosphor layers corresponding to red and green may be provided. In this case, an example (example of the second embodiment) in which the light source part is configured to emit blue light and the light guide member is provided with a groove part that reflects the blue light may be applied.

  Further, in the third embodiment, as in the case of the flat area of the phosphor layer, an example in which the flat area increases as the distance from the light source portion also increases in the groove portion. However, the present invention is not limited thereto, and the groove portion is not limited thereto. The plane area may be the same regardless of the distance from the light source.

  Further, in the first and third embodiments, the example in which the planar areas of the phosphor layers of the respective colors of the plurality of light emitting units are made equal is shown. However, the present invention is not limited to this, and a plurality of layers as shown in FIG. Among the phosphor layers of each color of the light emitting unit 3, the plane area of at least one color phosphor layer (blue (B) phosphor layer 311c in the example of FIG. 14) is the plane area of the phosphor layers of other colors. May be different. Thereby, the intensity balance of each color can be easily adjusted.

1,201 Light source (light source)
2, 202 Light guide member 3, 203, 303 Light emitting part 3a, 203a, 303a Red phosphor layer (phosphor layer)
3b, 203b, 303b Green phosphor layer (phosphor layer)
3c, 203c, 303c Blue phosphor layer (phosphor layer)
3d, 203d, 303d Light shielding layer 4 Filter member 10, 210, 310 Illumination part (illumination device)
20 reflective liquid crystal display (display) (reflective liquid crystal display)
204 Groove part 220 Electrophoretic display part (display part) (electrophoretic display device)
400, 410, 420 Electronic equipment

Claims (12)

A light source;
A light guide member for guiding light emitted from the light source;
A light emitting unit including a phosphor layer provided on a surface of the light guide member and emitting a surface by light guided by the light guide member;
The light emitted from the light source consists of near ultraviolet light or blue light,
When the light emitted from the light source is near-ultraviolet light, the phosphor layer includes a red phosphor layer, a green phosphor layer, and a blue phosphor layer that emit light in red, green, and blue, respectively, The red phosphor layer, the green phosphor layer, and the blue phosphor layer are configured to irradiate by generating white light with red light, green light, and blue light emitted from the red phosphor layer, the green phosphor layer, and the blue phosphor layer,
When the light emitted from the light source is blue light, the phosphor layer includes a red phosphor layer and a green phosphor layer that emit light in red and green, respectively, and the red phosphor layer and the green phosphor. An illumination device configured to generate and irradiate white light with red light and green light irradiated from a phosphor layer and blue light from the light source. A plurality of the light emitting portions are arranged in an island shape on the surface of the light guide member,
The planar area of the phosphor layer of at least one color among the phosphor layers of each color of the plurality of light emitting units is configured to be different from the planar area of the phosphor layers of other colors. Lighting device. A plurality of the light emitting portions are arranged in an island shape on the surface of the light guide member,
Among the plurality of light emitting units, the phosphor layers of the respective colors of the light emitting units arranged at positions where the distance from the light source is larger than the phosphor layers of the respective colors of the light emitting units arranged in the vicinity of the light source. The lighting device according to claim 1, wherein the lighting device is configured to have a larger plane area. A light-shielding layer provided for each of the light-emitting parts, and further provided on a side opposite to the side of the light-emitting part facing the light guide member;
The light-shielding layer provided in each said light emission part is an illuminating device of any one of Claims 1-3 which has a substantially the same plane area. A plurality of the light emitting portions are arranged in an island shape on the surface of the light guide member,
The lighting device according to any one of claims 1 to 4, wherein the phosphor layers corresponding to one color are arranged in the plurality of light emitting units for each of the light emitting units. A plurality of the light emitting portions are arranged in an island shape on the surface of the light guide member,
The illuminating device according to claim 1, wherein the phosphor layers corresponding to a plurality of colors are disposed in the plurality of light emitting units for each of the light emitting units.   When the light emitted from the light source is near-ultraviolet light, the near-ultraviolet light is provided from the surface of the light-guiding member on the side where the light-emitting part is disposed, so as to cover the light-guiding member and the light-emitting part. The illuminating device according to claim 1, further comprising a filter member for suppressing emission.   When the light emitted from the light source is blue light, the light guide member is formed on a surface on the side where the phosphor layer is disposed, and the blue light from the light source is emitted from the phosphor layer of the light guide member. The illuminating device of any one of Claims 1-6 containing the groove part for making it reflect so that it may go to the opposite side to the side by which A is arrange | positioned. A light source, a light guide member that guides light emitted from the light source, and a light emitting unit that is provided on a surface of the light guide member and has a phosphor layer that emits surface light by the light guided by the light guide member. Including a lighting section;
A display unit that reflects and displays light emitted from the illumination unit;
The light emitted from the light source of the illumination unit is composed of near ultraviolet light or blue light,
When the light emitted from the light source of the illumination unit is near-ultraviolet light, the phosphor layer includes a red phosphor layer, a green phosphor layer, and a blue phosphor layer that emit light in red, green, and blue, respectively. Including, configured to generate and irradiate white light with red light, green light and blue light emitted from the red phosphor layer, the green phosphor layer and the blue phosphor layer,
When the light emitted from the light source of the illumination unit is blue light, the phosphor layer includes a red phosphor layer and a green phosphor layer that emit light in red and green, respectively, and the red phosphor layer And a display device configured to generate and irradiate white light with red light and green light emitted from the green phosphor layer and blue light from the light source.   The display device according to claim 9, wherein the display unit includes a reflective liquid crystal display device including a reflective layer that reflects light emitted from the illumination unit and a liquid crystal layer.   The display device according to claim 9, wherein the display unit includes an electrophoretic display device.   The electronic device provided with the display apparatus of any one of Claims 9-11.

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