Patent Description:
Liquid crystal displays have been proposed in the past that each include a light source in which a blue light emitting diode, a green phosphor, and a red phosphor are combined (see, for example, PTL <NUM>). In addition, a lighting instrument and an image display have been known that each include a nitride phosphor (see, for example, PTL <NUM>). <CIT> describes a display apparatus includes a first light source, a second light source, a third light source, a first color filter, a second color filter, a third color filter, and an opto-functional device. The first light source and the second light source are allowed to emit light in a first emission time period to form a first display pattern. The third light source is allowed to emit light, and the opto-functional device controls the third color filter to transmit light in a second emission time period to form a second display pattern. The first emission time period and the second emission time period are alternately repeated to combine the first display pattern and the second display pattern to obtain an intended display pattern when the display apparatus displays the intended display pattern. <CIT> discloses a semiconductor light emitting device which emits a blue light component, a green light component, and a red light component. The blue light component is a light component emitted by a first solid light emitting element that emits light having an emission peak in a wavelength range of <NUM> to less than <NUM>, the green light component is light emitted by a second solid light emitting element that emits light having an emission peak in a wavelength range of <NUM> to less than <NUM> that is converted into wavelength-converted light by a green phosphor, and the red light component is light emitted by at least one solid light emitting element selected from the first solid light emitting element and the second solid light emitting element that is converted into wavelength-converted light by a red phosphor. The green phosphor emits green light on the basis of an electronic energy transition of Mn2+.

Incidentally, in recent years, displays have been requested to offer higher-definition display images and display images each having a further expanded color gamut.

It is thus desirable to provide a display and an electronic apparatus that are each able to display an image having a wider color gamut and a light emitting device that is applicable to such a display and an electronic apparatus.

The invention is defined by the subject-matter of the appended independent claims, wherein further embodiments are set out in the appended dependent claims.

Alight emitting device according to the embodiment of the present disclosure achieves color light over a wider color gamut, for example, by alternately turning on the first light source and the second light source. In addition, a display and an electronic apparatus according to the respective embodiments of the present disclosure each display an image having a wider color gamut.

The following describes embodiments of the present disclosure in detail with reference to the drawings. It is to be noted that description is given in the following order.

<FIG> is a schematic diagram illustrating an overall configuration of a display including a light emitting device <NUM> according to a first embodiment of the present disclosure. <FIG> is an enlarged perspective view of a light emitting section <NUM> (<NUM>) that is the main portion of the light emitting device <NUM>. <FIG> is a cross-sectional view of the light emitting section <NUM> (<NUM>) in the direction of an arrow taken along a III-III cutting line illustrated in <FIG>.

This display is, for example, a flat-screen television apparatus including the light emitting device <NUM>, an optical sheet <NUM>, and a liquid crystal display panel <NUM> disposed in order in the Z axis direction. The liquid crystal display panel <NUM> is, for example, a transmissive liquid crystal display panel including a liquid crystal layer sandwiched between a pair of transparent electrodes and a color filter. In addition, the light emitting device <NUM> is a backlight that illuminates the liquid crystal display panel <NUM> from the back. Further, the optical sheet <NUM> provided between the light emitting device <NUM> and the liquid crystal display panel <NUM> includes, for example, one or more of a diffusion panel, a diffusion sheet, a lens film, and a polarization reflecting sheet. It is to be noted that the optical sheet <NUM> is not limited to the optical member described above, but may include an optical member having other characteristics.

In this specification, the direction of the distance between the light emitting device <NUM>, the optical sheet <NUM>, and the liquid crystal display panel <NUM> is defined as the Z axis direction (also referred to as front/back direction or thickness direction). The up/down direction of the widest surface of a substrate <NUM>, the optical sheet <NUM>, or the liquid crystal display panel <NUM>, that is, the principal surface is defined as the X axis direction. The left/right direction of the principal surface is defined as the Y axis direction.

The light emitting device <NUM> includes, for example, the substrate <NUM> and the plurality of light emitting sections <NUM> and the plurality of light emitting sections <NUM>. The plurality of light emitting sections <NUM> and the plurality of light emitting sections <NUM> are arranged in a matrix along a surface <NUM> of the substrate <NUM> opposed to the optical sheet <NUM> as illustrated in <FIG>. It is to be noted that <FIG> illustrates an example in which the light emitting sections <NUM> and the light emitting sections <NUM> are alternately arranged along both the up/down direction and the left/right direction, but the present disclosure is not limited to this.

With reference to <FIG> and <FIG>, a detailed configuration of the light emitting section <NUM> is described. The light emitting section <NUM> is configured to perform operations of turning on and turning off first emission light including first blue light and first red light. The light emitting section <NUM> is a specific example corresponding to a "first light source" according to the present disclosure. The light emitting section <NUM> includes a light emitting element <NUM>, a holder <NUM>, and a wavelength converter <NUM>. (A) of <FIG> illustrates an example of the spectral characteristics of the first emission light emitted from the light emitting section <NUM>. It is to be noted that <FIG> illustrates the wavelength [nm] on the horizontal axis and the radiant intensity [-] on the vertical axis.

The light emitting element <NUM> is provided on a bottom section 13B of the holder <NUM>. The light emitting element <NUM> is, for example, blue LED (Light Emitting Diode; light emitting diode) that emits the first blue light. The light emitting element <NUM> has an optical axis CL1 that coincides, for example, with the Z axis direction. The light emitting element <NUM> may have a package structure in which a light emitting layer is contained in a resin layer. Alternatively, the light emitting element <NUM> may be flip chip LED having a light emitting layer provided in an exposed manner. In addition, the first blue light mentioned here is, for example, light that exhibits the maximum intensity in a center wavelength of <NUM> or more and <NUM> or less and a half width of <NUM> or more and <NUM> or less.

The holder <NUM> is provided on the surface <NUM> of the substrate <NUM>. The holder <NUM> includes the bottom section 13B and a wall section 13W. The bottom section 13B supports the light emitting element <NUM>. The wall section 13W surrounds the light emitting element <NUM> in the XY plane orthogonal to the Z axis direction. In other words, the light emitting element <NUM> is provided in a recessed section provided in the middle of the holder <NUM>. The central position of the holder <NUM> in the XY plane may coincide, for example, with the optical axis CL1. It is to be noted that the holder <NUM> may be shaped to integrally surround the light emitting element <NUM> with no gap. Further, in the present embodiment, each of the light emitting sections <NUM> is provided with the one light emitting element <NUM>. The one light emitting element <NUM> is surrounded by the holder <NUM>, but the present disclosure is not limited to this. For example, each of the light emitting section <NUM> may be provided with the plurality of light emitting elements <NUM> and the plurality of those light emitting elements <NUM> may be supported by the one holder <NUM>.

The holder <NUM> includes, for example, an inner wall surface <NUM> opposed to the light emitting element <NUM>. The inner wall surface <NUM> is a reflecting surface that reflects the first emission light from the light emitting element <NUM>. The inner wall surface <NUM> may be shaped, for example, to incline farther from the light emitting element <NUM> as the inner wall surface <NUM> comes closer to the optical sheet <NUM> from the surface <NUM> of the substrate <NUM>.

For example, the recessed section of the holder <NUM> is filled with the wavelength converter <NUM>. The wavelength converter <NUM> is provided to cover the light emitting element <NUM>. The wavelength converter <NUM> includes a first red phosphor that is excited by the first blue light emitted from the light emitting element <NUM> to emit the first red light. The spectral characteristics of the first red light exhibit an emission line spectrum, for example, as illustrated in (A) of <FIG>. Examples of the first red phosphor include an KSF phosphor (K<NUM>SiF<NUM>: Mn<NUM>+) or a quantum dot. In a case where the first red phosphor is an KSF phosphor (K<NUM>SiF<NUM>: Mn<NUM>+), the first emission light emitted from the light emitting section <NUM> exhibits a peak near <NUM> like a peak P11R illustrated in (A) of <FIG>. Here, the wavelength converter <NUM> is a specific example corresponding to a "first phosphor layer" according to the present disclosure.

In addition, the wavelength converter <NUM> transmits a portion of the first blue light emitted from the light emitting element <NUM> as it is without converting the portion of the first blue light into the first red light. The first emission light emitted from the light emitting section <NUM> thus exhibits, for example, a peak having a center wavelength of <NUM> or more and <NUM> or less and a half width of <NUM> or more and <NUM> or less as a spectral characteristic like a peak P11B illustrated in (A) of <FIG>.

In this way, the first emission light emitted from the light emitting section <NUM> includes the first blue light and the first red light, but does not substantially include the green light. In other words, in the first emission light, the first blue light and the first red light are subjected to sufficient color separation. This is advantageous to increase the color purity of light emitted from the light emitting device <NUM>.

With reference to <FIG> and <FIG>, a detailed configuration of the light emitting section <NUM> is described. The light emitting section <NUM> is configured to perform operations of turning on and turning off second emission light including second red light and green light. The light emitting section <NUM> is a specific example corresponding to a "second light source" according to the present disclosure. Here, it is possible to independently perform the operations of turning on and turning off the first emission light by the light emitting section <NUM>, that is, an operation of blinking the first emission light, and an operation of blinking the second emission light by the light emitting section <NUM>. The light emitting section <NUM> includes a light emitting element <NUM>, a holder <NUM>, and a wavelength converter <NUM>. (B) of <FIG> illustrates an example of the spectral characteristics of the second emission light with respect to a wavelength. The second emission light is emitted from the light emitting section <NUM>.

The light emitting element <NUM> is provided on a bottom section 23B of the holder <NUM> as illustrated in <FIG>. The light emitting element <NUM> is, for example, blue LED that emits second blue light. The light emitting element <NUM> has the optical axis CL1 that coincides, for example, with the Z axis direction. The light emitting element <NUM> may have a package structure in which a light emitting layer is contained in a resin layer. Alternatively, the light emitting element <NUM> may be flip chip LED having a light emitting layer provided in an exposed manner. In addition, the second blue light mentioned here is, for example, light that exhibits the maximum peak having a center wavelength of <NUM> or more and <NUM> or less and a half width of <NUM> or more and <NUM> or less as with the first blue light emitted from the light emitting element <NUM>. It is to be noted that the first blue light and the second blue light may have substantially the same spectral characteristics or may have different spectral characteristics from each other.

The holder <NUM> is provided on the surface <NUM> of the substrate <NUM> as with the holder <NUM>. The holder <NUM> includes the bottom section 23B and a wall section 23W. The bottom section 23B supports the light emitting element <NUM>. The wall section 23W surrounds the light emitting element <NUM> in the XY plane orthogonal to the Z axis direction. In other words, the light emitting element <NUM> is provided in a recessed section provided in the middle of the holder <NUM>. The central position of the holder <NUM> in the XY plane may coincide, for example, with an optical axis CL2. It is to be noted that the holder <NUM> may be shaped to integrally surround the light emitting element <NUM> with no gap. Further, in the present embodiment, each of the light emitting sections <NUM> is provided with the one light emitting element <NUM>. The one light emitting element <NUM> is surrounded by the holder <NUM>, but the present disclosure is not limited to this. For example, each of the light emitting section <NUM> may be provided with the plurality of light emitting elements <NUM> and the plurality of those light emitting elements <NUM> may be supported by the one holder <NUM>.

The holder <NUM> includes, for example, an inner wall surface <NUM> opposed to the light emitting element <NUM>. The inner wall surface <NUM> is a reflecting surface that reflects the second emission light from the light emitting element <NUM>. The inner wall surface <NUM> may be shaped, for example, to incline farther from the light emitting element <NUM> as the inner wall surface <NUM> comes closer to the optical sheet <NUM> from the surface <NUM> of the substrate <NUM>.

For example, the recessed section of the holder <NUM> is filled with the wavelength converter <NUM>. The wavelength converter <NUM> is provided to cover the light emitting element <NUM>. The wavelength converter <NUM> includes a second red phosphor that is excited by the second blue light emitted from the light emitting element <NUM> to emit the second red light. The spectral characteristics of the second red light exhibit a continuous spectrum, for example, like a peak P21R illustrated in (B) of <FIG>. In other words, the half width of the maximum peak of the first red light emitted from the first red phosphor of the wavelength converter <NUM> in the light emitting section <NUM> is narrower than the half width of the maximum peak of the second red light emitted from the second red phosphor of the wavelength converter <NUM>.

Further, the wavelength converter <NUM> includes a green phosphor that is excited by the second blue light emitted from the light emitting element <NUM> to emit the green light. Examples of the green phosphor include an oxynitride phosphor or a YAG phosphor (Y<NUM>(Al, Ga)<NUM>O<NUM>: Ce<NUM>+). The oxynitride phosphor includes respective elements of Si (silicon), Al (aluminum), O (oxygen), and N (nitrogen). In a case where the green phosphor is an oxynitride phosphor called βSiAlON, a radiant intensity peak appears that has, for example, a center wavelength of <NUM> or more and <NUM> or less and a half width of <NUM> or more and <NUM> or less as a spectral characteristic like a peak P21G illustrated in (B) of <FIG>.

In the light emitting section <NUM>, the wavelength converter <NUM> converts substantially the whole of the second blue light emitted from the light emitting element <NUM> into the second red light and the green light. The second emission light emitted from the light emitting section <NUM> thus includes substantially no blue component as a spectral characteristic as illustrated in (B) of <FIG>.

The display according to the present embodiment further includes a controller <NUM> as illustrated in <FIG>. The controller <NUM> includes an image signal processing circuit 4A, an LED control circuit 4B, and an LCD control circuit 4C. The image signal processing circuit 4A generates a display control signal in accordance with an input signal from an external apparatus and transmits the display control signal to the LCD control circuit 4C. The image signal processing circuit 4A further generates a backlight control signal for controlling the light emitting device <NUM> serving as a backlight and transmits the backlight control signal to the LED control circuit 4B. The LED control circuit 4B controls the operations of turning on the light and turning off the light by the light emitting sections <NUM> and <NUM> in the light emitting device <NUM> on the basis of the backlight control signal from the image signal processing circuit 4A. The LCD control circuit 4C controls an operation of displaying an image by the liquid crystal display panel <NUM> on the basis of the display control signal from the image signal processing circuit 4A. The image signal processing circuit 4A further synchronizes the operation of displaying an image by the liquid crystal display panel <NUM> and the operations of blinking the light by the light emitting section <NUM> and <NUM> in the light emitting device <NUM>.

In this way, in the display according to the present embodiment, the light emitting device <NUM> includes the light emitting section <NUM> that emits the first emission light and the light emitting section <NUM> that emits the second emission light. Those light emitting section <NUM> and light emitting section <NUM> are configured to be able to independently perform operations of blinking the light.

<FIG> is a chromaticity diagram illustrating the chromaticity range (color gamut) of display light in the display according to the present embodiment. In <FIG>, a triangle TR11 indicates a chromaticity range obtained in a case where the light emitting section <NUM> of the light emitting device <NUM> is turned on and the light emitting section <NUM> is turned off. In other words, the triangle TR11 indicates the chromaticity range of the first emission light. The triangle TR11 connects the three points of a point 11R, a point <NUM>, and a point 11B. In addition, in <FIG>, a triangle TR21 indicates a chromaticity range obtained in a case where the light emitting section <NUM> of the light emitting device <NUM> is turned off and the light emitting section <NUM> is turned on. In other words, the triangle TR21 indicates the chromaticity range of the second emission light. The triangle TR21 connects the three points of a point 21R, a point <NUM>, and a point 21B. It is to be noted that each of the points 11R and 21R is a chromaticity point (chromaticity coordinates) obtained in a case where the liquid crystal display panel <NUM> is subjected to red display. In the red display, only the pixels in which red filters are disposed are selectively displayed. Each of the points <NUM> and <NUM> is a chromaticity point obtained in a case where the liquid crystal display panel <NUM> is subjected to green display. In the green display, only the pixels in which green filters are disposed are selectively displayed. Each of the points 11B and 21B is a chromaticity point obtained in a case where the liquid crystal display panel <NUM> is subjected to blue display. In the blue display, only the pixels in which blue filters are disposed are selectively displayed. Further, <FIG> uses a dashed line to illustrate the chromaticity range (referred to as BT. <NUM> chromaticity range below) defined in the international standard BT. <NUM> (Broadcasting service television <NUM>) formulated by the International Telecommunication Union Radiocommunication Sector (ITU-R).

As illustrated in <FIG>, the chromaticity range of the first emission light indicated by the triangle TR11 is biased toward magenta. The chromaticity range of the second emission light indicated by the triangle TR21 is biased toward yellow. It is not thus possible to display a large portion of the BT. <NUM> chromaticity range by using the first emission light alone from the light emitting section <NUM>. Similarly, it is not possible to display a large portion of the BT. <NUM> chromaticity range by using the second emission light alone from the light emitting section <NUM>.

However, the display according to the present embodiment offers a mixed color of the first emission light and the second emission light by concurrently turning on the light emitting section <NUM> and the light emitting section <NUM>. In other words, it is possible to display the color corresponding to the chromaticity point of the intermediate chromaticity range between the chromaticity range of the first emission light indicated by the triangle TR11 and the chromaticity range of the second emission light indicated by the triangle TR21 in <FIG>. In that case, the balance is adjusted between the radiant intensity of the light emitting section <NUM> and the radiant intensity of the light emitting section <NUM>. This makes it possible to display the color of any chromaticity point between the chromaticity range of the first emission light indicated by the triangle TR11 and the chromaticity range of the second emission light indicated by the triangle TR21.

Here, the light emitting device <NUM> is controlled by the LED control circuit 4B on the basis of the image signal processing circuit 4A, thereby causing the display according to the present embodiment to alternately perform the operation of turning on the light by the light emitting section <NUM> and the operation of turning on the light by the light emitting section <NUM>, for example, as illustrated in <FIG>. The LCD control circuit 4C controls the liquid crystal display panel <NUM> on the basis of the image signal processing circuit 4A, thereby causing this display to further display a first image and a second image alternately as illustrated in <FIG>. The first image corresponds to the first emission light by the light emitting section <NUM>. The second image corresponds to the second emission light by the light emitting section <NUM>. In that case, the image signal processing circuit 4A synchronizes the operation of displaying an image by the liquid crystal display panel <NUM> and the operations of blinking the light by the light emitting section <NUM> and <NUM> in the light emitting device <NUM>. Specifically, one display frame is equally divided into two subframes including a first subframe <NUM> and a second subframe <NUM>. In the first subframe <NUM>, the light emitting section <NUM> is turned on and the first image is displayed on the liquid crystal display panel <NUM>. In the subsequent second subframe <NUM>, the light emitting section <NUM> is turned on and the second image is displayed on the liquid crystal display panel <NUM>. Similarly, in each of the subsequent display frames, the image signal processing circuit 4A causes the LED control circuit 4B and the LCD control circuit 4C to control the light emitting device <NUM> and the liquid crystal display panel <NUM>. It is to be noted that <FIG> is a timing chart illustrating an example of timings of driving the light emitting device <NUM> and the liquid crystal display panel <NUM> in the display according to the present embodiment.

In this way, the display according to the present embodiment prepares the first image and the second image in units of display frames and displays them in a time division manner. The first image corresponds to the first emission light by the light emitting section <NUM>. The second image corresponds to the second emission light by the light emitting section <NUM>. This makes it possible to display the color of any chromaticity point over a wider chromaticity range, for example, as indicated by a triangle TR in the chromaticity diagram of <FIG> is a chromaticity diagram illustrating the chromaticity range of a display color that the display according to the present embodiment is able to display.

In this way, the light emitting device <NUM> according to the present embodiment alternately turns on the light emitting section <NUM> and the light emitting section <NUM>, thereby making it possible to emit color light over a wider color gamut. The display according to the present embodiment including the light emitting device <NUM> thus makes it possible to display an image having a wider color gamut.

<FIG> is a cross-sectional view of a light emitting section 21A in a light emitting device 1A according to a modification example of the light emitting device <NUM> according to the first embodiment described above. As illustrated in <FIG>, the light emitting section 21A further includes a blue light absorbing filter <NUM> disposed to be opposed to the surface <NUM> of the substrates <NUM> to cover the light emitting element <NUM>. <FIG> illustrates the dependency of the transmittance of the blue light absorbing filter <NUM> on a wavelength.

The light emitting section 21A is provided with the blue light absorbing filter <NUM>. This makes it possible to absorb the second blue light from the light emitting element <NUM>. The second blue light is included in the second emission light. As a result, it is possible to prevent the direct light (second blue light) from the light emitting element <NUM> from leaking from the light emitting section 21A. The direct light (second blue light) is originally unnecessary. The light emitting device 1A therefore makes it possible to expect a further increase in color purity.

<FIG> is an enlarged cross-sectional view of the main portion of a light emitting device 1B according to a second embodiment of the present disclosure and corresponds to <FIG> described in the first embodiment described above. The light emitting device <NUM> according to the first embodiment described above includes the light emitting section <NUM> as a second light source that emits the second emission light. In contrast, the light emitting device 1B according to the present embodiment includes a light emitting section <NUM> as a second light source that emits the second emission light in place of the light emitting section <NUM>. Except for this point, the light emitting device 1B has substantially the same configuration as that of the light emitting device <NUM> according to the first embodiment described above with respect to the other points.

With reference to <FIG>, a detailed configuration of the light emitting section <NUM> is described. The light emitting section <NUM> is configured to perform the operations of turning on and turning off the second emission light including the second red light and the green light as with the light emitting section <NUM>. The light emitting section <NUM> is a specific example corresponding to the "second light source" according to the present disclosure. In the light emitting device 1B, it is possible to independently perform the operation of blinking the first emission light by the light emitting section <NUM> and the operation of blinking the second emission light by the light emitting section <NUM>. The light emitting section <NUM> includes a light emitting element <NUM>, a holder <NUM>, and a wavelength converter <NUM>. <FIG> illustrates an example of the spectral characteristics of the second emission light emitted from the light emitting section <NUM>. It is to be noted that <FIG> illustrates the wavelength [nm] on the horizontal axis and the radiant intensity [-] on the vertical axis.

The light emitting element <NUM> is provided on a bottom section 33B of the holder <NUM>. The light emitting element <NUM> is, for example, green LED that emits the green light. The light emitting element <NUM> has an optical axis CL3 that coincides, for example, with the Z axis direction. The light emitting element <NUM> may have a package structure in which a light emitting layer is contained in a resin layer. Alternatively, the light emitting element <NUM> may be flip chip LED having a light emitting layer provided in an exposed manner. In addition, the green light mentioned here is, for example, light that exhibits the maximum peak having a center wavelength of <NUM> or more and <NUM> or less and a half width of <NUM> or more and <NUM> or less.

The holder <NUM> has a configuration similar to those of the holder <NUM> and the holder <NUM>. Specifically, the holder <NUM> is provided on the surface <NUM> of the substrate <NUM>. The holder <NUM> includes the bottom section 33B and a wall section 33W. The bottom section 33B supports the light emitting element <NUM>. The wall section 33W surrounds the light emitting element <NUM> in the XY plane orthogonal to the Z axis direction. In other words, the light emitting element <NUM> is provided in a recessed section provided in the middle of the holder <NUM>. The central position of the holder <NUM> in the XY plane may coincide, for example, with the optical axis CL3. Further, in the present embodiment, each of the light emitting sections <NUM> is provided with the one light emitting element <NUM>. The one light emitting element <NUM> is surrounded by the holder <NUM>, but the present disclosure is not limited to this. For example, each of the light emitting section <NUM> may be provided with the plurality of light emitting elements <NUM> and the plurality of those light emitting elements <NUM> may be supported by the one holder <NUM>.

For example, the recessed section of the holder <NUM> is filled with the wavelength converter <NUM>. The wavelength converter <NUM> is provided to cover the light emitting element <NUM>. The wavelength converter <NUM> includes a second red phosphor that is excited by the green light emitted from the light emitting element <NUM> to emit the second red light. The spectral characteristics of the second red light exhibit a continuous spectrum, for example, like a peak P31R illustrated in <FIG>. In other words, the half width of the maximum peak of the first red light emitted from the first red phosphor of the wavelength converter <NUM> in the light emitting section <NUM> is narrower than the half width of the maximum peak of the second red light emitted from the second red phosphor of the wavelength converter <NUM>.

The second emission light emitted from the light emitting section <NUM> includes substantially no blue component as a spectral characteristic as illustrated in <FIG>.

The light emitting device 1B according to the present embodiment also alternately turns on the light emitting section <NUM> and the light emitting section <NUM>, thereby making it possible to emit color light over a wider color gamut. The display according to the present embodiment including the light emitting device 1B thus makes it possible to display an image having a wider color gamut.

<FIG> is an enlarged cross-sectional view of the main portion of a light emitting device 1C according to a third embodiment of the present disclosure and corresponds to <FIG> described in the first embodiment described above. The light emitting device <NUM> according to the first embodiment described above includes the light emitting section <NUM> as a second light source that emits the second emission light. In contrast, the light emitting device 1C according to the present embodiment includes a light emitting section <NUM> as a second light source that emits the second emission light in place of the light emitting section <NUM>. Except for this point, the light emitting device 1C has substantially the same configuration as that of the light emitting device <NUM> according to the first embodiment described above with respect to the other points. The following description thus describes a difference between the light emitting section <NUM> and the light emitting section <NUM> with emphasis and the description of the other components that are substantially the same is omitted as appropriate.

With reference to <FIG>, a detailed configuration of the light emitting section <NUM> is described. The light emitting section <NUM> is configured to perform the operations of turning on and turning off the second emission light including the second red light and the green light as with the light emitting section <NUM>. The light emitting section <NUM> is a specific example corresponding to the "second light source" according to the present disclosure. In the light emitting device 1C, it is possible to independently perform the operation of blinking the first emission light by the light emitting section <NUM> and the operation of blinking the second emission light by the light emitting section <NUM>. The light emitting section <NUM> includes a light emitting element 42B, a light emitting element <NUM>, a holder <NUM>, and a wavelength converter <NUM>.

The light emitting element 42B and the light emitting element <NUM> is provided on a bottom section 43B of the holder <NUM>. The light emitting element 42B is, for example, blue LED that emits the second blue light. The light emitting element <NUM> is, for example, green LED that emits the green light. The light emitting element 42B and the light emitting element <NUM> respectively have an optical axis CL4B and an optical axis CL4G that each coincide, for example, with the Z axis direction. Each of the light emitting element 42B and the light emitting element <NUM> may have a package structure in which a light emitting layer is contained in a resin layer. Alternatively, each of the light emitting element 42B and the light emitting element <NUM> may be flip chip LED having a light emitting layer provided in an exposed manner. The second blue light emitted from the light emitting element 42B is, for example, light that exhibits the maximum peak having a center wavelength of <NUM> or more and <NUM> or less and a half width of <NUM> or more and <NUM> or less as with the light emitting element <NUM> according to the first embodiment described above. In addition, the green light emitted from the light emitting element <NUM> is, for example, light that exhibits the maximum peak having a center wavelength of <NUM> or more and <NUM> or less and a half width of <NUM> or more and <NUM> or less as with the light emitting element <NUM> according to the second embodiment described above.

The holder <NUM> has a configuration similar to those of the holder <NUM>, the holder <NUM>, and the holder <NUM>. Specifically, the holder <NUM> is provided on the surface <NUM> of the substrate <NUM>. The holder <NUM> includes the bottom section 43B and a wall section 43W. The bottom section 43B supports the light emitting element 42B and the light emitting element <NUM>. The wall section 43W surrounds the light emitting element 42B and the light emitting element <NUM> in the XY plane orthogonal to the Z axis direction. In other words, each of the light emitting element 42B and the light emitting element <NUM> is provided in a recessed section provided in the middle of the holder <NUM>. The central position of the holder <NUM> in the XY plane may coincide, for example, with the intermediate point between the optical axis CL4B and the optical axis CL4G. Further, in the present embodiment, each of the light emitting sections <NUM> is provided with the one light emitting element 42B and the one light emitting element <NUM>. These two light emitting elements 42B and <NUM> are surrounded by the holder <NUM>. The present disclosure is not, however, limited to this. For example, the plurality of light emitting elements 42B and the plurality of light emitting elements <NUM> may be disposed for each of the light emitting sections <NUM>. Those light emitting elements 42B and <NUM> may be supported by the one holder <NUM>.

The holder <NUM> includes, for example, an inner wall surface <NUM> opposed to the light emitting element 42B and the light emitting element <NUM>. The inner wall surface <NUM> is a reflecting surface that reflects the second emission light from the light emitting element 42B and the light emitting element <NUM>. The inner wall surface <NUM> may incline, for example, farther from the light emitting element 42B and the light emitting element <NUM> as the inner wall surface <NUM> comes closer to the optical sheet <NUM> from the surface <NUM> of the substrate <NUM>.

For example, the recessed section of the holder <NUM> is filled with the wavelength converter <NUM>. The wavelength converter <NUM> is provided to cover the light emitting element 42B and the light emitting element <NUM>. The wavelength converter <NUM> includes a second red phosphor that is excited by the second blue light emitted from the light emitting element 42B and the green light emitted from the light emitting element <NUM> to emit the second red light. The spectral characteristics of the second red light exhibit a continuous spectrum, for example, like the peak P31R illustrated in <FIG>.

In the wavelength converter <NUM>, the second red phosphor absorbs a large portion of the second blue light emitted from the light emitting element 42B. Therefore, the second emission light emitted from the light emitting section <NUM> includes substantially no blue component as a spectral characteristic. In contrast, a portion of the green light emitted from the light emitting element <NUM> is absorbed by the second red phosphor and converted into the second red light. The remaining portion of the green light emitted from the light emitting element <NUM> is not, however, converted into the second red light, but passes through the second red phosphor as it is. The second emission light emitted from the light emitting section <NUM> thus includes a green component as a spectral characteristic.

The light emitting device 1C according to the present embodiment also alternately turns on the light emitting section <NUM> and the light emitting section <NUM>, thereby making it possible to emit color light over a wider color gamut. The display according to the present embodiment including the light emitting device 1C thus makes it possible to display an image having a wider color gamut.

The following describes an application example of the display according to the embodiment described above to an electronic apparatus. Examples of the electronic apparatus include a television apparatus, a digital camera, a notebook personal computer, a portable terminal apparatus such as a mobile phone, a video camera, or the like. In other words, the display described above is applicable to an electronic apparatus in any field that displays an image signal inputted from the outside or an image signal generated inside as an image or video.

<FIG> illustrates the appearance of a tablet terminal apparatus to which the display according to the embodiment described above is applied. <FIG> illustrates the appearance of another tablet terminal apparatus to which the display according to the embodiment described above is applied. Each of these tablet terminal apparatuses includes, for example, a display unit <NUM> and a non-display unit <NUM>. This display unit <NUM> includes the display according to the embodiment described above.

Each of <FIG> illustrates the appearance of a desktop illumination apparatus to which the light emitting device <NUM> according to the embodiment described above or the like is applied. For example, this illumination apparatus includes an illumination unit <NUM> that is attached to a supporting post <NUM> provided on a base mount <NUM>. This illumination unit <NUM> includes the light emitting device <NUM> or the like. Shaping the substrate <NUM>, the optical sheet <NUM>, and the like to curve allows the illumination unit <NUM> to have any shape such as a cylindrical shape illustrated in <FIG> or a curved shape illustrated in <FIG>.

<FIG> illustrates the appearance of an indoor illumination apparatus to which the light emitting device <NUM> according to the embodiment described above or the like is applied. This illumination apparatus includes the illumination unit <NUM> including the light emitting device <NUM> and the like. An appropriate number of illumination units <NUM> are disposed at appropriate intervals on a ceiling 850A of a building. It is to be noted that the illumination unit <NUM> is installable not only on the ceiling 850A, but also in any place such as a wall 850B or a floor (not illustrated) in accordance with use.

In these illumination apparatuses, illumination is performed by using light from the light emitting device <NUM> or the like. Here, each of the illumination apparatuses includes the light emitting device <NUM> or the like that has superior light emission efficiency and more uniform in-plane radiant intensity distribution, increasing the illumination quality.

The technology according to the present disclosure is applicable to a variety of products. For example, the technology according to the present disclosure may be applied to an operating room system.

<FIG> is a view schematically depicting a general configuration of an operating room system <NUM> to which the technology according to an embodiment of the present disclosure can be applied. Referring to <FIG>, the operating room system <NUM> is configured such that a group of apparatus installed in an operating room are connected for cooperation with each other through an audiovisual (AV) controller <NUM> and an operating room controlling apparatus <NUM>.

In the operating room, various apparatus may be installed. In <FIG>, as an example, various apparatus group <NUM> for endoscopic surgery, a ceiling camera <NUM>, a surgery field camera <NUM>, a plurality of display apparatus 5103A to 5103D, a recorder <NUM>, a patient bed <NUM> and an illumination <NUM> are depicted. The ceiling camera <NUM> is provided on the ceiling of an operating room and images the hands of a surgeon. The surgery field camera <NUM> is provided on the ceiling of the operating room and images a state of the entire operating room. Among the apparatus mentioned, the apparatus group <NUM> belongs to an endoscopic surgery system <NUM> hereinafter described and include an endoscope, a display apparatus which displays an image picked up by the endoscope and so forth. Various apparatus belonging to the endoscopic surgery system <NUM> are referred to also as medical equipment. Meanwhile, the display apparatus 5103A to 5103D, the recorder <NUM>, the patient bed <NUM> and the illumination <NUM> are apparatus which are equipped, for example, in the operating room separately from the endoscopic surgery system <NUM>. The apparatus which do not belong to the endoscopic surgery system <NUM> are referred to also as non-medical equipment. The audiovisual controller <NUM> and/or the operating room controlling apparatus <NUM> cooperatively control operation of the medical equipment and the non-medical equipment with each other.

For example, to the audiovisual controller <NUM>, information relating to an image of a surgical region in a body cavity of a patient imaged by the endoscope may be transmitted as the display information from the apparatus group <NUM>. The audiovisual controller <NUM> controls at least one of the display apparatus 5103A to 5103D, which are apparatus of an output destination, to display acquired display information (namely, images picked up during surgery or various pieces of information relating to the surgery). In the example depicted, the display apparatus 5103A is a display apparatus installed so as to be suspended from the ceiling of the operating room; the display apparatus 5103B is a display apparatus installed on a wall face of the operating room; the display apparatus 5103C is a display apparatus installed on a desk in the operating room; and the display apparatus 5103D is a mobile apparatus (for example, a tablet personal computer (PC)) having a display function.

In the operating room system <NUM>, a centralized operation panel <NUM> is provided such that it is possible to issue an instruction regarding image display to the audiovisual controller <NUM> or issue an instruction regarding operation of the non-medical equipment to the operating room controlling apparatus <NUM> through the centralized operation panel <NUM>.

<FIG> is a view depicting an example of display of an operation screen image on the centralized operation panel <NUM>. 15B, as an example, an operation screen image is depicted which corresponds to a case in which two display apparatus are provided as apparatus of an output destination in the operating room system <NUM>. Referring to <FIG>, the operation screen image <NUM> includes a sending source selection region <NUM>, a preview region <NUM> and a control region <NUM>.

In the sending source selection region <NUM>, the sending source apparatus provided in the operating room system <NUM> and thumbnail screen images representative of display information the sending source apparatus have are displayed in an associated manner with each other. In the preview region <NUM>, a preview of screen images displayed on two display apparatus (Monitor <NUM> and Monitor <NUM>) which are apparatus of an output destination is displayed. A sending source operation region <NUM> and an output destination operation region <NUM> are provided in the control region <NUM>. In the sending source operation region <NUM>, a graphical user interface (GUI) part for performing an operation for an apparatus of a sending source is displayed. In the output destination operation region <NUM>, a GUI part for performing an operation for an apparatus of an output destination is displayed. In the output destination operation region <NUM>, GUI parts for performing various operations for display on a display apparatus which is an apparatus of an output destination (swap, flip, color adjustment, contrast adjustment and switching between two dimensional (2D) display and three dimensional (3D) display) are provided.

Further, the technology according to the present disclosure is also favorable for a liquid crystal display, for example, for film production. A display including the light emitting device <NUM> to which the technology according to the present technology is applied is excellent in reproducibility of a wide range of color gamut. Therefore, it is possible to support the current broadcasting standard and the next generation broadcasting standard used for the digital cinema.

Although the above has described the present disclosure with reference to the embodiments and the experimental examples, the present disclosure is not limited to the embodiment or the like described above. It is possible to make a variety of modifications. For example, the configuration of the display or the light emitting device has been specifically described above in the embodiment or the like described above. However, it is not necessary to include all of the components. In addition, other components may be included.

In the first embodiment described above, the light emitting section <NUM> serving as the first light source and the light emitting section <NUM> serving as the second light source are displayed in a time division manner, but the present disclosure is not limited to this. For example, the light emitting section <NUM> and the light emitting section <NUM> may be concurrently turned on. In that case, it is sufficient if the light emitting section <NUM> of the light emitting section <NUM> and the light emitting section <NUM> both of which are on is turned off after the light emitting section <NUM> is turned off, for example, as in the timing chart illustrated in <FIG>. The first red phosphor including the KSF phosphor (K<NUM>SiF<NUM>: Mn<NUM>+) has a longer afterglow time than that of the second red phosphor. Therefore, in a case where the light emitting section <NUM> and the light emitting section <NUM> are concurrently turned off, a red afterglow AG caused by the first red phosphor is visually recognized. Turning off the light emitting section <NUM> earlier than the light emitting section <NUM> thus allows the second emission light from the light emitting section <NUM> to make the red afterglow AG inconspicuous.

In this way, the light emitting device according to the embodiment of the present disclosure makes it possible to emit color light over a wider color gamut. In addition, the display and the electronic apparatus according to the respective embodiments of the present disclosure each make it possible to display an image having a wider color gamut while maintaining the display performance.

The present application claims the priority on the basis of <CIT> with Japan Patent Office.

Claim 1:
A light emitting device (<NUM>) comprising:
a first light source (<NUM>) comprising a first blue light emitting element (<NUM>) and a first phosphor layer, the first blue light emitting element (<NUM>) emitting the first blue light, the first phosphor layer including a first red phosphor that is excited by the first blue light to emit the first red light; characterised in that the first light source (<NUM>) is configured to perform an operation of blinking first emission light including first blue light and first red light; and
a second light source (<NUM>) comprising a second blue light emitting element (<NUM>) and a second phosphor layer, the second blue light emitting element (<NUM>) emitting second blue light, the second phosphor layer including a second red phosphor and a green phosphor, the second red phosphor being excited by the second blue light to emit the second red light, the green phosphor being excited by the second blue light to emit the green light, wherein the first red phosphor has a longer afterglow time than that of the second red phosphor, and the second light source (<NUM>) is configured to perform an operation of blinking second emission light independently of the operation of blinking the first emission light by the first light source (<NUM>), the second emission light including second red light and green light,
wherein the light emitting device (<NUM>) is configured to turn off the second light source (<NUM>) after the first light source (<NUM>) is turned off.