Light-emitting device, display device and electronic device

Abstract

To provide a light emitting device that is used for a display that is able to display an image having a wider color gamut.SOLUTION: This light emitting device includes: a first light source capable of performing an operation of blinking first emission light including first blue light and first red light; and a second light source capable of performing an operation of blinking second emission light including second red light and green light independently of the operation of blinking the first emission light by the first light source.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a light-emitting device, and a display device and electronic device including the same. [Background technology]

[0002] A liquid crystal display device having a light source that combines a blue light-emitting diode with a green phosphor and a red phosphor has been proposed (see, for example, Patent Document 1). Also, lighting fixtures and image display devices that use nitride phosphors are known (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-17781 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-216711 Summary of the Invention

[0004] In recent years, there has been a demand for display devices to not only display images with higher resolution, but also to further expand the color gamut of the displayed images.

[0005] Therefore, it is desirable to provide a display device and electronic device capable of displaying images with a wider color gamut, and a light-emitting device applicable to such a display device and electronic device.

[0006] A light emitting device according to an embodiment of the present disclosure includes a first light source capable of flashing a first emitted light including a first blue light and a first red light, and a second light source capable of flashing a second emitted light including a second red light and a green light independently of the flashing of the first emitted light in the first light source. Furthermore, a display device and an electronic device according to an embodiment of the present disclosure include the light emitting device according to the embodiment of the present disclosure.

[0007] In a light-emitting device according to an embodiment of the present disclosure, for example, color light over a wider color gamut can be realized by alternately lighting a first light source and a second light source. Furthermore, in a display device and an electronic device according to an embodiment of the present disclosure, an image with a wider color gamut can be displayed. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram illustrating a display device according to a first embodiment of the present disclosure. [Figure 2] 2 is an enlarged perspective view showing a light-emitting portion of the light-emitting device in the display device shown in FIG. 1. FIG. [Figure 3] 2 is an enlarged cross-sectional view showing a light-emitting portion of the light-emitting device in the display device shown in FIG. [Figure 4] 2 is a characteristic diagram showing the spectral characteristics of a light-emitting section of the light-emitting device shown in FIG. [Figure 5] 2 is a chromaticity diagram showing the chromaticity ranges of the display lights produced by the first emitted light and the second emitted light in the display device shown in FIG. 1. FIG. [Figure 6] 2 is a timing chart showing an example of drive timings of the light emitting device and the liquid crystal display panel in the display device shown in FIG. [Figure 7] 2 is a chromaticity diagram showing the chromaticity range of the display light in the display device shown in FIG. [Figure 8A] FIG. 10 is a cross-sectional view illustrating a light-emitting section as a modified example of the first embodiment. [Figure 8B] 8B is a characteristic diagram showing the wavelength dependency of the transmittance of the absorption filter in the light-emitting section of FIG. 8A. FIG. [Figure 9] 10 is an enlarged cross-sectional view showing a light-emitting portion of a light-emitting device in a display device according to a second embodiment of the present disclosure. FIG. [Figure 10] 10 is a characteristic diagram showing the spectral characteristics of the light emitting section of the light emitting device shown in FIG. [Figure 11] FIG. 10 is an enlarged cross-sectional view illustrating a light-emitting portion of a light-emitting device in a display device according to a third embodiment of the present disclosure. [Figure 12A]1 is a perspective view illustrating the appearance of a tablet terminal device equipped with a display device of the present disclosure. [Figure 12B] FIG. 10 is a perspective view illustrating the appearance of another tablet terminal device equipped with a display device of the present disclosure. [Figure 13] 1 is a perspective view illustrating the appearance of a first lighting device including a light-emitting device according to the present disclosure. [Figure 14] FIG. 10 is a perspective view illustrating the appearance of a second lighting device including the light-emitting device of the present disclosure. [Figure 15] FIG. 10 is a perspective view illustrating the appearance of a third lighting device including the light-emitting device of the present disclosure. [Figure 16A] 1 is a diagram illustrating an overall configuration of an operating room system. [Figure 16B] FIG. 10 is a diagram showing a display example of an operation screen on a centralized operation panel. [Figure 17] 10 is a timing chart illustrating another example of the operation of the light emitting device in the display device shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The description will be made in the following order. 1. First embodiment (Example of a display device equipped with a light-emitting device having two types of light sources, each including a blue light-emitting element and a phosphor layer) 2. Modification of the First Embodiment (Example of a light emitting device with a light source including a blue light absorbing filter) 3. Second Embodiment (Example of a display device including a light emitting device having a first light source including a blue light emitting element and a phosphor layer, and a second light source including a green light emitting element and a phosphor layer) 4. Third Embodiment (Example of a display device including a light emitting device having a first light source including a blue light emitting element and a phosphor layer, and a second light source including a blue light emitting element, a green light emitting element, and a phosphor layer) 5. Display device application examples 6.Application examples of light-emitting devices 7. Application Examples 8. Other Modifications

[0010] <1. First embodiment> [Display device configuration] Fig. 1 is a schematic diagram illustrating the overall configuration of a display device including a light-emitting device 1 according to a first embodiment of the present disclosure. Fig. 2 is an enlarged perspective view of a light-emitting section 11 (21), which is a main part of the light-emitting device 1. Fig. 3 is a cross-sectional view of the light-emitting section 11 (21) taken along the III-III cutting line shown in Fig. 1, as viewed in the direction of the arrows.

[0011] This display device is, for example, a flat-screen television set including a light-emitting device 1, an optical sheet 2, and a liquid crystal display panel 3 arranged in this order in the Z-axis direction. The liquid crystal display panel 3 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. The light-emitting device 1 is a backlight that illuminates the liquid crystal display panel 3 from behind. Furthermore, the optical sheet 2 provided between the light-emitting device 1 and the liquid crystal display panel 3 includes, for example, one or more of a diffusion plate, a diffusion sheet, a lens film, and a polarized reflective sheet. Note that the optical sheet 2 is not limited to the above optical members, and may be an optical member having other properties. may include:

[0012] In this specification, the distance direction between the light-emitting device 1, the optical sheet 2, and the liquid crystal display panel 3 is defined as the Z-axis direction (also referred to as the front-to-back direction or thickness direction), the up-down direction on the widest surface, i.e., the main surface, of the substrate 10, the optical sheet 2, or the liquid crystal display panel 3 is defined as the X-axis direction, and the left-to-right direction on the main surface is defined as the Y-axis direction.

[0013] (Configuration of light emitting device 1) 1, the light emitting device 1 has, for example, a substrate 10 and a plurality of light emitting sections 11 and a plurality of light emitting sections 21 arranged in a matrix along a surface 10S of the substrate 10 that faces the optical sheet 2. Note that, although Fig. 1 shows an example in which the light emitting sections 11 and the light emitting sections 21 are arranged alternately in both the vertical and horizontal directions, the present disclosure is not limited to this.

[0014] (Configuration of light-emitting unit 11) The detailed configuration of light-emitting unit 11 will be described with reference to Figures 2 and 3. Light-emitting unit 11 is capable of turning on and off first emitted light including first blue light and first red light, and is a specific example corresponding to the "first light source" of the present disclosure. Light-emitting unit 11 has a light-emitting element 12, a holder 13, and a wavelength conversion unit 14. Figure 4 (A) shows an example of the spectral characteristics of the first emitted light emitted by light-emitting unit 11. In Figure 4, the horizontal axis represents wavelength [nm], and the vertical axis represents radiant intensity [-].

[0015] The light emitting element 12 is provided on the bottom 13B of the holder 13. The light emitting element 12 is, for example, a blue LED (Light Emitting Diode) that emits a first blue light. The light emitting element 12 has an optical axis CL1 that coincides with, for example, the Z-axis direction. The light emitting element 12 may have, for example, a package structure in which a light emitting layer is encapsulated in a resin layer, or may be a flip-chip LED in which the light emitting layer is exposed. The first blue light here refers to light that exhibits maximum intensity, has a center wavelength of 430 nm to 470 nm, and has a half-width of 10 nm to 30 nm.

[0016] The holder 13 is provided on the surface 10S of the substrate 10 and has a bottom 13B that supports the light-emitting element 12 and a wall 13W that surrounds the light-emitting element 12 in an XY plane perpendicular to the Z-axis direction. That is, the light-emitting element 12 is provided in a recess provided in the center of the holder 13. The center position of the holder 13 in the XY plane may coincide with the optical axis CL1, for example. Note that the holder 13 may be shaped to surround the light-emitting element 12 in a seamless, integrated manner. Furthermore, in this embodiment, one light-emitting element 12 is provided per light-emitting unit 11, and the holder 13 surrounds the light-emitting element 12. However, the present disclosure is not limited to this. For example, multiple light-emitting elements 12 may be provided per light-emitting unit 11, and the multiple light-emitting elements 12 may be supported by a single holder 13.

[0017] The holder 13 includes, for example, an inner wall surface 13S facing the light emitting element 12. The inner wall surface 13S is a reflective surface that reflects the first emitted light from the light emitting element 12, and may have a shape that is inclined so that the further it goes from the surface 10S of the substrate 10 toward the optical sheet 2, the farther it gets from the light emitting element 12.

[0018] The wavelength conversion unit 14 is filled, for example, in a recess of the holder 13, and is provided so as to cover the light emitting element 12. The wavelength conversion unit 14 includes a first red phosphor that is excited by the first blue light emitted by the light emitting element 12 to emit first red light. The spectral characteristics of the first red light exhibit a line spectrum, for example, as shown in FIG. 4(A). The first red phosphor is, for example, KSF phosphor (K2SiF6:Mn 4+ ) or quantum dots. The red phosphor in 1 is KSF phosphor (K2SiF6:Mn 4+ ), the first emitted light emitted by the light-emitting unit 11 exhibits a peak near 630 nm, like peak P11R shown in (A) of Figure 4. Here, the wavelength conversion unit 14 is a specific example that corresponds to the "first phosphor layer" of the present disclosure.

[0019] Furthermore, part of the first blue light emitted by the light-emitting element 12 is transmitted as is through the wavelength converting section 14 without being converted into the first red light. Therefore, the first emitted light emitted by the light-emitting section 11 exhibits, in its spectral characteristics, a peak having a central wavelength of 430 nm or more and 470 nm or less and a half-width of 10 nm or more and 30 nm or less, like peak P11B shown in Fig. 4(A).

[0020] As described above, the first emitted light emitted from the light-emitting unit 11 includes the first blue light and the first red light, but does not substantially include green light. That is, in the first emitted light, the first blue light and the first red light are sufficiently separated in color. This is advantageous for improving the color purity of the light emitted from the light-emitting device 1.

[0021] (Configuration of light emitting unit 21) The detailed configuration of light-emitting unit 21 will be described with reference to FIGS. 2 and 3. Light-emitting unit 21 is capable of turning on and off second emitted light including second red light and green light, and is a specific example corresponding to the "second light source" of the present disclosure. Here, the turning on and off of the first emitted light of light-emitting unit 11, i.e., the blinking operation, and the blinking operation of the second emitted light of light-emitting unit 21 can be performed independently of each other. Light-emitting unit 21 has a light-emitting element 22, a holder 23, and a wavelength conversion unit 24. FIG. 4B shows an example of the spectral characteristics of the wavelength of the second emitted light emitted by light-emitting unit 21.

[0022] As shown in FIG. 2, the light-emitting element 22 is provided on the bottom 23B of the holder 23. The light-emitting element 22 is, for example, a blue LED that emits second blue light. The light-emitting element 22 has an optical axis CL1 that coincides with, for example, the Z-axis direction. The light-emitting element 22 may have, for example, a package structure in which a light-emitting layer is encapsulated in a resin layer, or may be a flip-chip LED in which the light-emitting layer is exposed. The second blue light here is light that, like the first blue light emitted by the light-emitting element 12, exhibits a maximum peak with a center wavelength of 430 nm to 470 nm and a half-width of 10 nm to 30 nm. The first blue light and the second blue light may have substantially the same spectral characteristics or different spectral characteristics.

[0023] Like the holder 13, the holder 23 is disposed on the surface 10S of the substrate 10 and includes a bottom 23B that supports the light-emitting element 22 and a wall 23W that surrounds the light-emitting element 22 in an XY plane perpendicular to the Z-axis direction. That is, the light-emitting element 22 is disposed in a recess provided in the center of the holder 23. The center position of the holder 23 in the XY plane may coincide with the optical axis CL2, for example. The holder 23 may also be shaped to surround the light-emitting element 22 without any gaps. Furthermore, in this embodiment, one light-emitting element 22 is provided per light-emitting unit 21, and the holder 23 surrounds the light-emitting element 22. However, the present disclosure is not limited to this. For example, multiple light-emitting elements 22 may be provided per light-emitting unit 21, and the multiple light-emitting elements 22 may be supported by a single holder 23.

[0024] The holder 23 includes, for example, an inner wall surface 23S facing the light emitting element 22. The inner wall surface 23S is a reflective surface that reflects the second emitted light from the light emitting element 22, and may have a shape that is inclined so as to become farther away from the light emitting element 22 as it goes from the surface 10S of the substrate 10 toward the optical sheet 2, for example.

[0025] The wavelength converting unit 24 is provided, for example, by filling a recess in the holder 23 and covering the light emitting element 22. The wavelength converting unit 24 includes a second red phosphor that is excited by the second blue light emitted by the light emitting element 22 to emit second red light. The spectral characteristics of the second red light exhibit a continuous spectrum, such as peak P21R shown in FIG. 4B. That is, the half width of the maximum peak of the first red light emitted by the first red phosphor of the wavelength converting unit 14 in the light emitting unit 11 is narrower than the half width of the maximum peak of the second red light emitted by the second red phosphor of the wavelength converting unit 24.

[0026] Furthermore, the wavelength conversion unit 24 includes a green phosphor that emits green light when excited by the second blue light emitted by the light emitting element 22. Examples of the green phosphor include an oxynitride phosphor containing the elements Si (silicon), Al (aluminum), O (oxygen), and N (nitrogen), or a YAG phosphor (Y3(Al,Ga)5O12 :Ce 3+ When the green phosphor is an oxynitride phosphor called βSiAlON, the spectral characteristics show a peak in radiation intensity with a central wavelength of 520 nm to 560 nm and a half-width of 40 nm to 65 nm, such as peak P21G shown in FIG. 4(B).

[0027] In light-emitting section 21, almost all of the second blue light emitted by light-emitting element 22 is converted into second red light and green light in wavelength converting section 24. Therefore, the second emitted light emitted by light-emitting section 21 does not substantially contain a blue component in its spectral characteristics, as shown in FIG.

[0028] As shown in FIG. 1 , the display device of this embodiment further includes a control unit 4. The control unit 4 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 response to an input signal from an external device and transmits it to the LCD control circuit 4C. The image signal processing circuit 4A also generates a backlight control signal for controlling the light emitting device 1 as a backlight and transmits it to the LED control circuit 4B. The LED control circuit 4B controls the on / off operation of the light emitting units 11 and 21 in the light emitting device 1 based on the backlight control signal from the image signal processing circuit 4A. The LCD control circuit 4C controls the image display operation of the liquid crystal display panel 3 based on the display control signal from the image signal processing circuit 4A. The image signal processing circuit 4A also synchronizes the image display operation of the liquid crystal display panel 3 with the blinking operation of the light emitting units 11 and 21 in the light emitting device 1.

[0029] [Effects of the display device] Thus, in the display device of this embodiment, the light-emitting device 1 has a light-emitting section 11 that emits a first light and a light-emitting section 21 that emits a second light, and the light-emitting section 11 and the light-emitting section 21 are configured to be able to flash independently of each other.

[0030] FIG. 5 is a chromaticity diagram showing the chromaticity range (color gamut) of the display light of the display device of this embodiment. In FIG. 5, triangle TR11 connecting points 11R, 11G, and 11B represents the chromaticity range when light-emitting unit 11 of light-emitting device 1 is turned on and light-emitting unit 21 is turned off, i.e., the chromaticity range of the first emitted light. Also, in FIG. 5, triangle TR21 connecting points 21R, 21G, and 21B represents the chromaticity range when light-emitting unit 11 of light-emitting device 1 is turned off and light-emitting unit 21 is turned on, i.e., the chromaticity range of the second emitted light. Note that points 11R and 21R are chromaticity points (chromaticity coordinates) when the liquid crystal display panel 3 is set to red display, selectively displaying only pixels with red filters. Points 11G and 21G are chromaticity points when the liquid crystal display panel 3 is set to green display, selectively displaying only pixels with green filters. Points 11B and 21B are chromaticity points when the liquid crystal display panel 3 is set to blue display by selectively displaying only pixels where blue filters are arranged. The dashed line indicates the chromaticity range (hereinafter referred to as the BT.2020 chromaticity range) defined in the international standard BT.2020 (Broadcasting service television 2020) established by the International Telecommunication Union Radiocommunication Sector (ITU-R).

[0031] As shown in Figure 5, the chromaticity range of the first emitted light indicated by triangle TR11 is biased toward magenta, and the chromaticity range of the second emitted light indicated by triangle TR21 is biased toward yellow. Therefore, most of the BT.2020 chromaticity range cannot be displayed using only the first emitted light from light-emitting unit 11. Similarly, most of the BT.2020 chromaticity range cannot be displayed using only the second emitted light from light-emitting unit 21.

[0032] However, in the display device of the present embodiment, by simultaneously turning on light-emitting unit 11 and light-emitting unit 21, a mixed color of the first emitted light and the second emitted light can be obtained. That is, it is possible to display a color corresponding to a chromaticity point in a chromaticity range intermediate between the chromaticity range of the first emitted light indicated by triangle TR11 and the chromaticity range of the second emitted light indicated by triangle TR21 in Fig. 5. In this case, by adjusting the balance between the radiation intensity of light-emitting unit 11 and the radiation intensity of light-emitting unit 21, it is possible to display a color of any chromaticity point between the chromaticity range of the first emitted light indicated by triangle TR11 and the chromaticity range of the second emitted light indicated by triangle TR21.

[0033] In the display device of this embodiment, the LED control circuit 4B based on the image signal processing circuit 4A controls the light-emitting device 1 to alternately turn on the light-emitting unit 11 and the light-emitting unit 21, as shown in FIG. 6 . The LCD control circuit 4C based on the image signal processing circuit 4A also controls the liquid crystal display panel 3 to alternately display a first image corresponding to the first light emitted by the light-emitting unit 11 and a second image corresponding to the second light emitted by the light-emitting unit 21, as shown in FIG. 6 . In this case, the image signal processing circuit 4A synchronizes the image display operation on the liquid crystal display panel 3 with the blinking operation of the light-emitting units 11 and 21 in the light-emitting device 1. Specifically, one display frame is divided into a first subframe 1 and a second subframe 2. In the first subframe 1, the light-emitting unit 11 is turned on and the first image is displayed on the liquid crystal display panel 3. In the subsequent second subframe 2, the light-emitting unit 21 is turned on and the second image is displayed on the liquid crystal display panel 3. Similarly, for each subsequent display frame, the image signal processing circuit 4A causes the LED control circuit 4B and the LCD control circuit 4C to control the light emitting device 1 and the liquid crystal display panel 3. Note that Fig. 6 is a timing chart showing an example of the drive timing of the light emitting device 1 and the liquid crystal display panel 3 in the display device of this embodiment.

[0034] In this way, the display device of this embodiment prepares a first image corresponding to the first light emitted by light-emitting unit 11 and a second image corresponding to the second light emitted by light-emitting unit 21 in display frame units, and displays them in a time-division manner. This makes it possible to display colors at any chromaticity point across a wider chromaticity range, as shown by triangle TR in the chromaticity diagram of Figure 7. Figure 7 is a chromaticity diagram that shows the chromaticity range of display colors that can be displayed on the display device of this embodiment.

[0035] Thus, the light emitting device 1 of this embodiment can emit colored light over a wider color gamut by alternately lighting the light emitting units 11 and 21. Therefore, the display device of this embodiment that includes the light emitting device 1 can display images over a wider color gamut.

[0036] <2. Modification of the First Embodiment> FIG. 8A is a cross-sectional view showing a light-emitting section 21A in a light-emitting device 1A as a modified example of the light-emitting device 1 of the first embodiment. As shown in FIG. 8A, the light-emitting section 21A further includes a blue light-absorbing filter 25 disposed opposite the surface 10S of the substrate 10 so as to cover the light-emitting element 22. FIG. 8B shows the wavelength dependency of the transmittance of the blue light-absorbing filter 25. There are.

[0037] Light-emitting section 21A is provided with blue light absorbing filter 25, and is therefore able to absorb the second blue light from light-emitting element 22 that is included in the second emitted light. As a result, it is possible to prevent unnecessary direct light (second blue light) from light-emitting element 22 from leaking from light-emitting section 21A. Therefore, light-emitting device 1A is expected to achieve further improvement in color purity.

[0038] 3. Second Embodiment [Display device configuration] 9 is an enlarged cross-sectional view showing a main portion of a light emitting device 1B according to a second embodiment of the present disclosure, and corresponds to FIG. 3 described in the first embodiment. The light emitting device 1 of the first embodiment has a light emitting unit 21 as a second light source that emits a second emitted light. In contrast, the light emitting device 1B of this embodiment has a light emitting unit 31 instead of the light emitting unit 21 as a second light source that emits the second emitted light. Except for this point, the light emitting device 1B has substantially the same configuration as the light emitting device 1 of the first embodiment.

[0039] (Configuration of light emitting unit 31) The detailed configuration of the light-emitting unit 31 will be described with reference to FIG. 9. Like the light-emitting unit 21, the light-emitting unit 31 is capable of turning on and off the second emitted light including the second red light and green light, and is a specific example corresponding to the "second light source" of the present disclosure. In the light-emitting device 1B, the blinking operation of the first emitted light of the light-emitting unit 11 and the blinking operation of the second emitted light of the light-emitting unit 31 can be performed independently of each other. The light-emitting unit 31 has a light-emitting element 32, a holder 33, and a wavelength conversion unit 34. FIG. 10 shows an example of the spectral characteristics of the second emitted light emitted by the light-emitting unit 31. In FIG. 10, the horizontal axis represents wavelength [nm] and the vertical axis represents radiant intensity [-].

[0040] The light-emitting element 32 is provided on the bottom 33B of the holder 33. The light-emitting element 32 is, for example, a green LED that emits green light. The light-emitting element 32 has an optical axis CL3 that coincides with, for example, the Z-axis direction. The light-emitting element 32 may have, for example, a package structure in which a light-emitting layer is encapsulated in a resin layer, or may be a flip-chip LED in which the light-emitting layer is exposed. The green light referred to here is, for example, light that exhibits a maximum peak with a center wavelength of 520 nm to 540 nm and a half-width of 20 nm to 40 nm.

[0041] The holder 33 has a configuration similar to that of the holder 13 and the holder 23. Specifically, the holder 33 is provided on the surface 10S of the substrate 10 and includes a bottom 33B that supports the light-emitting element 32 and a wall 33W that surrounds the light-emitting element 32 in an XY plane perpendicular to the Z-axis direction. That is, the light-emitting element 32 is provided in a recess provided in the center of the holder 33. The center position of the holder 33 in the XY plane may coincide with the optical axis CL3, for example. Furthermore, in this embodiment, one light-emitting element 32 is provided for one light-emitting unit 31, and the one light-emitting element 32 is surrounded by the holder 33. However, the present disclosure is not limited to this. For example, multiple light-emitting elements 32 may be provided for one light-emitting unit 31, and the multiple light-emitting elements 32 may be supported by one holder 33.

[0042] The wavelength converting unit 34 is provided, for example, by filling a recess in the holder 33 and covering the light emitting element 32. The wavelength converting unit 34 includes a second red phosphor that is excited by the green light emitted by the light emitting element 32 to emit second red light. The spectral characteristics of the second red light exhibit a continuous spectrum, such as peak P31R shown in FIG. 10 . That is, the half width of the maximum peak of the first red light emitted by the first red phosphor of the wavelength converting unit 14 in the light emitting unit 11 is narrower than the half width of the maximum peak of the second red light emitted by the second red phosphor of the wavelength converting unit 34.

[0043] The second emitted light emitted by the light emitting section 31 has spectral characteristics that do not substantially contain a blue component, as shown in FIG.

[0044] [Effects of the display device] Light emitting device 1B of this embodiment can also emit colored light over a wider color gamut by alternately lighting light emitting unit 11 and light emitting unit 31. Therefore, a display device of this embodiment equipped with light emitting device 1B can display an image over a wider color gamut.

[0045] 4. Third Embodiment [Display device configuration] FIG. 11 is an enlarged cross-sectional view showing a main portion of a light-emitting device 1C according to a third embodiment of the present disclosure, corresponding to FIG. 3 described in the first embodiment. The light-emitting device 1 of the first embodiment has a light-emitting unit 21 as a second light source that emits a second emitted light. In contrast, the light-emitting device 1C of this embodiment has a light-emitting unit 41 instead of the light-emitting unit 21 as a second light source that emits the second emitted light. Except for this point, the light-emitting device 1C has substantially the same configuration as the light-emitting device 1 of the first embodiment. Therefore, the following description will focus on the differences between the light-emitting unit 21 and the light-emitting unit 41, and will omit descriptions of other substantially identical components as appropriate.

[0046] (Configuration of light emitting unit 41) The detailed configuration of light-emitting unit 41 will be described with reference to FIG. 11. Like light-emitting unit 21, light-emitting unit 41 is capable of turning on and off second emitted light including second red light and green light, and is a specific example corresponding to the "second light source" of the present disclosure. In light-emitting device 1C, the blinking operation of the first emitted light of light-emitting unit 11 and the blinking operation of the second emitted light of light-emitting unit 41 can be performed independently of each other. Light-emitting unit 41 has light-emitting element 42B, light-emitting element 42G, holder 43, and wavelength conversion unit 44.

[0047] The light-emitting elements 42B and 42G are provided on the bottom 43B of the holder 43. The light-emitting element 42B is, for example, a blue LED that emits second blue light, and the light-emitting element 42G is, for example, a green LED that emits green light. The light-emitting elements 42B and 42G have optical axes CL4B and CL4G, respectively, that coincide with the Z-axis direction. The light-emitting elements 42B and 42G may have a package structure in which a light-emitting layer is encapsulated in a resin layer, or may be flip-chip LEDs in which the light-emitting layer is exposed. The second blue light emitted by the light-emitting element 42B is, like the light-emitting element 22 of the first embodiment, light that exhibits a maximum peak with a center wavelength of 430 nm to 470 nm and a half-width of 10 nm to 30 nm. Furthermore, the green light emitted by the light-emitting element 42G is, similar to the light-emitting element 32 of the second embodiment, light that exhibits a maximum peak with a central wavelength of, for example, 520 nm or more and 540 nm or less and a half-width of 20 nm or more and 40 nm or less.

[0048] The holder 43 has a configuration similar to that of the holder 13, the holder 23, and the holder 33. Specifically, the holder 43 is provided on the surface 10S of the substrate 10 and includes a bottom portion 43B that supports the light-emitting elements 42B and 42G, and a wall portion 43W that surrounds the light-emitting elements 42B and 42G in an XY plane perpendicular to the Z-axis direction. That is, the light-emitting elements 42B and 42G are provided in a recess provided in the center of the holder 43. The center position of the holder 43 in the XY plane may coincide with the midpoint between the optical axes CL4B and CL4G, for example. Furthermore, in the present embodiment, one light-emitting element 42B and one light-emitting element 42G are provided for each light-emitting unit 41, and the two light-emitting elements 42B and 42G are surrounded by the holder 43. However, the present disclosure is not limited to this. For example, a plurality of light emitting elements 42B and a plurality of light emitting elements 42G may be arranged for one light emitting section 41, and these may be supported by one holder 43.

[0049] The holder 43 includes an inner wall surface 43S facing, for example, the light emitting elements 42B and 42G. The inner wall surface 43S is a reflective surface that reflects the second emitted light from the light emitting elements 42B and 42G, and may be inclined, for example, so that the further from the surface 10S of the substrate 10 toward the optical sheet 2, the farther it is from the light emitting elements 42B and 42G.

[0050] Wavelength conversion unit 44 is provided, for example, by filling a recess in holder 43 and covering light emitting element 42B and light emitting element 42G. Wavelength conversion unit 44 includes a second red phosphor that is excited by the second blue light emitted by light emitting element 42B and the green light emitted by light emitting element 42G to emit second red light. The spectral characteristics of the second red light exhibit a continuous spectrum, such as peak P31R shown in FIG. 10 .

[0051] In the wavelength conversion section 44, the second red phosphor absorbs most of the second blue light emitted by the light-emitting element 42B. Therefore, the second emitted light emitted by the light-emitting section 41 does not substantially contain a blue component in its spectral characteristics. On the other hand, although a portion of the green light emitted by the light-emitting element 42G is absorbed by the second red phosphor and converted into the second red light, the remaining portion of the green light emitted by the light-emitting element 42G is not converted into the second red light and passes through the second red phosphor as is. Therefore, the second emitted light emitted by the light-emitting section 41 contains a green component in its spectral characteristics.

[0052] [Effects of the display device] Light emitting device 1C of this embodiment can also emit colored light over a wider color gamut by alternately lighting light emitting unit 11 and light emitting unit 41. Therefore, a display device of this embodiment equipped with light emitting device 1C can display an image with a wider color gamut.

[0053] <5. Examples of display device applications> Hereinafter, examples of application of the display device of the above embodiment to electronic devices will be described. Examples of electronic devices include television sets, digital cameras, notebook personal computers, portable terminal devices such as mobile phones, and video cameras. In other words, the display device can be applied to electronic devices in all fields that display externally input video signals or internally generated video signals as images or videos.

[0054] Fig. 12A shows the appearance of a tablet terminal device to which the display device of the above embodiment is applied. Fig. 12B shows the appearance of another tablet terminal device to which the display device of the above embodiment is applied. Each of these tablet terminal devices has, for example, a display unit 210 and a non-display unit 220, and this display unit 210 is configured by the display device of the above embodiment.

[0055] <6. Application examples of light-emitting devices> 13 and 14 show the appearance of a tabletop lighting device to which the light emitting device 1 of the above embodiment and the like are applied. This lighting device has, for example, a lighting unit 843 attached to a support 842 provided on a base 841, and this lighting unit 843 is composed of the light emitting device 1 and the like. By making the substrate 10 and the optical sheet 2 and the like curved, the lighting unit 843 can be made into any shape, such as a cylindrical shape as shown in FIG. 13 or a curved surface shape as shown in FIG. 14.

[0056] FIG. 15 shows the appearance of an indoor lighting device to which the light emitting device 1 of the above embodiment and the like are applied. This lighting device has lighting units 844 configured with the light emitting device 1 and the like. The lighting units 844 are arranged on a ceiling 850A of the building at an appropriate number and intervals. Note that the lighting units 844 may be arranged not only on the ceiling 850A but also on a wall 850B or floor depending on the application. It can be installed in any location, such as a staircase or a parking space (not shown).

[0057] In these lighting devices, illumination is provided by light from the light emitting device 1 or the like. Here, the lighting quality is improved because the lighting device 1 or the like has excellent light emitting efficiency and improved uniformity of the in-plane radiation intensity distribution.

[0058] <7. Application Examples> The technology disclosed herein may be applied to a variety of products, for example, an operating room system.

[0059] 16A is a diagram showing an outline of the overall configuration of an operating room system 5100 to which the technology according to the present disclosure can be applied. Referring to FIG. 16A, the operating room system 5100 is configured by connecting a group of devices installed in an operating room to each other via an audiovisual controller (AV controller) 5107 and an operating room control device 5109 so that they can cooperate with each other.

[0060] Various devices may be installed in an operating room. Fig. 16A illustrates, as an example, a group of various devices 5101 for endoscopic surgery, a ceiling camera 5187 mounted on the ceiling of the operating room to capture an image of the surgeon's hands, an operating room camera 5189 mounted on the ceiling of the operating room to capture an image of the entire operating room, multiple display devices 5103A-5103D, a recorder 5105, a patient bed 5183, and lighting 5191. Among these devices, the group of devices 5101 belongs to an endoscopic surgery system 5113 (described later) and includes an endoscope, a display device for displaying images captured by the endoscope, and the like. Each device belonging to the endoscopic surgery system 5113 is also referred to as medical equipment. Meanwhile, the display devices 5103A-5103D, the recorder 5105, the patient bed 5183, and the lighting 5191 are devices installed separately from the endoscopic surgery system 5113, for example, in an operating room. Each device that does not belong to these endoscopic surgery systems 5113 is also referred to as a non-medical device. The audiovisual controller 5107 and / or the operating room control device 5109 control the operations of these medical devices and non-medical devices in coordination with each other.

[0061] For example, information about an image of the surgical site inside the patient's body cavity captured by an endoscope may be transmitted as display information from the device group 5101 to the audiovisual controller 5107. The audiovisual controller 5107 displays the acquired display information (i.e., images captured during surgery and various pieces of information related to the surgery) on at least one of the display devices 5103A to 5103D, which are output destination devices. In the illustrated example, the display device 5103A is a display device hung from the ceiling of the operating room, the display device 5103B is a display device installed on a wall of the operating room, the display device 5103C is a display device installed on a desk in the operating room, and the display device 5103D is a mobile device with a display function (e.g., a tablet PC (personal computer)).

[0062] The operating room system 5100 is provided with a centralized operation panel 5111, through which the user can give instructions regarding image display to the audiovisual controller 5107 and instructions regarding the operation of non-medical equipment to the operating room control device 5109.

[0063] Fig. 16B is a diagram showing a display example of an operation screen on the centralized operation panel 5111. Fig. 15B shows, as an example, an operation screen corresponding to a case where two display devices are provided as output destination devices in the operating room system 5100. Referring to Fig. 16B, an operation screen 5193 is provided with a call source selection area 5195, a preview area 5197, and a control area 5201.

[0064] The source selection area 5195 displays, in association with each other, a source device included in the operating room system 5100 and a thumbnail screen representing display information held by the source device. The preview area 5197 displays a preview of the screen to be displayed on two display devices (Monitor 1 and Monitor 2), which are output destination devices. The control area 5201 is provided with a source operation area 5203 displaying GUI (Graphical User Interface) components for performing operations on the source device, and an output destination operation area 5205 displaying GUI components for performing operations on the output destination device. The output destination operation area 5205 is provided with GUI components for performing various operations (swap, flip, color adjustment, contrast adjustment, switching between 2D display and 3D display) on the display device, which is the output destination device.

[0065] Furthermore, the technology according to the present disclosure is also suitable for liquid crystal display devices for film production, for example. A display device equipped with a light-emitting device 1 to which the technology according to the present disclosure is applied is excellent in reproducing a wide color gamut. Therefore, it can comply with the current broadcasting standards used in digital cinema and next-generation broadcasting standards.

[0066] <8. Other Modifications> Although the present disclosure has been described above by way of embodiments and experimental examples, the present disclosure is not limited to the above embodiments, etc., and various modifications are possible. For example, although the above embodiments, etc. have specifically described the configurations of the display device and the light-emitting device, it is not necessary to include all of the components, and other components may also be included.

[0067] In the first embodiment, the light emitting unit 11 as the first light source and the light emitting unit 21 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 unit 11 and the light emitting unit 21 may be simultaneously turned on. In this case, as shown in the timing chart of FIG. 17, for example, it is preferable to control the state in which both the light emitting unit 11 and the light emitting unit 21 are turned on so that the light emitting unit 11 is turned off and then the light emitting unit 21 is turned off. 4+ ) has a longer afterglow time than the second red phosphor. Therefore, when the light-emitting unit 11 and the light-emitting unit 21 are turned off simultaneously, the red afterglow AG caused by the first red phosphor is visible. Therefore, by turning off the light-emitting unit 11 before the light-emitting unit 21, the red afterglow AG can be made less noticeable by the second emitted light from the light-emitting unit 21.

[0068] In this way, the light-emitting device according to an embodiment of the present disclosure can emit colored light over a wider color gamut, and the display device and electronic device according to an embodiment of the present disclosure can display images over a wider color gamut while maintaining display performance.

[0069] It should be noted that the effects described in this specification are merely examples and are not limited to those described, and other effects may also be achieved. Furthermore, the present technology may have the following configurations. (1) a first light source capable of flashing a first emitted light including a first blue light and a first red light; a second light source capable of flashing a second light including a second red light and a second green light independently of the flashing of the first light in the first light source; A light emitting device having the (2) The first light source is a first blue light-emitting element that emits the first blue light; and a first phosphor layer that includes a first red phosphor that is excited by the first blue light to emit the first red light; The second light source is a second blue light-emitting element that emits second blue light; and a second phosphor layer that includes a second red phosphor that is excited by the second blue light to emit the second red light and a green phosphor that is excited by the second blue light to emit the green light. The light emitting device according to (1) above. (3) The first light source is a first blue light-emitting element that emits the first blue light; and a first phosphor layer that includes a first red phosphor that is excited by the first blue light to emit the first red light; The second light source is a green light-emitting element that emits the green light; and a second phosphor layer that includes a second red phosphor that is excited by the green light and emits the second red light. The light emitting device according to (1) above. (4) The first light source is a first blue light-emitting element that emits the first blue light; and a first phosphor layer that includes a first red phosphor that is excited by the first blue light to emit the first red light; The second light source is a second blue light-emitting element that emits second blue light, a green light-emitting element that emits the green light, and a second phosphor layer that includes a second red phosphor that is excited by both the second blue light and the green light to emit the second red light. The light emitting device according to (1) above. (5) The half width of the maximum peak of the first red light is narrower than the half width of the maximum peak of the second red light. The light emitting device according to any one of (1) to (4) above. (6) the intensity distribution of the first red light with respect to wavelength exhibits a bright line spectrum; The intensity distribution of the second red light with respect to wavelength exhibits a continuous spectrum. The light emitting device according to any one of (1) to (5) above. (7) The first red phosphor is a KSF phosphor (K2SiF6:Mn4+ ) or quantum dots The light emitting device according to (2) above. (8) the second red phosphor is a nitride phosphor containing the elements Ca (calcium), Al (aluminum), Si (silicon) and N (nitrogen); The green phosphor is an oxynitride phosphor containing the elements Si (silicon), Al (aluminum), O (oxygen) and N (nitrogen), or a YAG phosphor (Y3(Al,Ga)5O 12 :Ce 3+ ) The light emitting device according to (2) above. (9) From a state in which both the first light source and the second light source are turned on, the first light source is turned off, and then the second light source is turned off. The light emitting device according to any one of (1) to (8) above. (10) The second light source further includes a blue light component cut filter that prevents transmission of blue light components. The light-emitting device according to (1) or (2) above. (11) a light-emitting device; a display panel that displays an image using light from the light-emitting device; Equipped with The light emitting device comprises: a first light source capable of flashing a first emitted light including a first blue light and a first red light; a second light source capable of flashing a second light including a second red light and a second green light independently of the flashing of the first light in the first light source; A display device having: (12) a control unit that synchronizes a lighting switching operation that switches between a lighting operation of the first light source and a lighting operation of the second light source, and a display switching operation that switches between a display operation of a first image corresponding to the first emitted light and a display operation of a second image corresponding to the second emitted light. The display device according to (11) above. (13) a display device including a light-emitting device and a display panel that displays an image using light from the light-emitting device; The light emitting device comprises: a first light source capable of flashing a first emitted light including a first blue light and a first red light; a second light source capable of flashing a second light including a second red light and a second green light independently of the flashing of the first light in the first light source; have electronic equipment.

[0070] This application claims priority based on Japanese Patent Application No. 2019-66654, filed on March 29, 2019, in the Japan Patent Office, the entire contents of which are incorporated herein by reference.

[0071] Those skilled in the art will recognize that various modifications, combinations, subcombinations, and variations may occur depending on design requirements and other factors, and are intended to be within the scope of the appended claims and their equivalents.

Claims

1. a first light source capable of flashing a first emitted light including a first blue light and a first red light; a second light source capable of flashing a second light including a second red light and a second green light independently of the flashing of the first light in the first light source; and the second light source has a light emitter and a color conversion material provided directly on the light emitter; The first light source and the second light source are turned on simultaneously, and the second light source is turned off after the first light source is turned off. Light-emitting device.

2. The first light source is a first blue light-emitting element that emits the first blue light; and a first phosphor layer that includes a first red phosphor that is excited by the first blue light to emit the first red light. The light emitting device according to claim 1 .

3. The second light source is a second blue light emitting element that emits a second blue light; a second phosphor layer including a second red phosphor that is excited by the second blue light to emit the second red light; The light emitting device according to claim 2 .

4. The second light source is a second blue light emitting element that emits a second blue light; a second phosphor layer including a green phosphor that is excited by the second blue light to emit the green light; The light emitting device according to claim 2 .

5. The second light source is a second blue light emitting element that emits a second blue light; a second phosphor layer including a second red phosphor that is excited by the second blue light to emit the second red light and a green phosphor that is excited by the second blue light to emit the green light; The light emitting device according to claim 2 .

6. The first light source is a first blue light-emitting element that emits the first blue light; and a first phosphor layer that includes a first red phosphor that is excited by the first blue light to emit the first red light; The second light source is a second blue light emitting element that emits a second blue light; a green light emitting element that emits the green light; a second phosphor layer including a second red phosphor that is excited by both the second blue light and the green light to emit the second red light; and have The light emitting device according to claim 1 .

7. The half width of the maximum peak of the first red light is narrower than the half-width of the The light emitting device according to claim 2 .

8. the intensity distribution of the first red light with respect to wavelength exhibits a bright line spectrum; The intensity distribution of the second red light with respect to wavelength exhibits a continuous spectrum. The light emitting device according to claim 2 .

9. The first red phosphor is a KSF phosphor (K 2 SiF 6 : Mn 4+ ) or quantum dots The light emitting device according to claim 2 .

10. The second light source further includes a blue light component cut filter that prevents transmission of blue light components. The light emitting device according to claim 1 .

11. a light-emitting device; a display panel that displays an image using light from the light-emitting device; Equipped with The light emitting device comprises: a first light source capable of flashing a first emitted light including a first blue light and a first red light; a second light source capable of flashing a second light including a second red light and a second green light independently of the flashing of the first light in the first light source; and the second light source has a light emitter and a color conversion material provided directly on the light emitter; The first light source and the second light source are turned on simultaneously, and the second light source is turned off after the first light source is turned off. Display device.

12. a control unit that synchronizes a lighting switching operation that switches between a lighting operation of the first light source and a lighting operation of the second light source, and a display switching operation that switches between a display operation of a first image corresponding to the first emitted light and a display operation of a second image corresponding to the second emitted light. The display device according to claim 11.

13. The first light source is a first blue light-emitting element that emits the first blue light; and a first phosphor layer that includes a first red phosphor that is excited by the first blue light to emit the first red light. The display device according to claim 11.

14. The second light source is a second blue light emitting element that emits a second blue light; a second phosphor layer including a second red phosphor that is excited by the second blue light to emit the second red light; The display device according to claim 13.

15. The second light source is a second blue light emitting element that emits a second blue light; a second phosphor layer including a green phosphor that is excited by the second blue light to emit the green light; The display device according to claim 13.

16. The second light source is a second blue light emitting element that emits a second blue light; a second phosphor layer including a second red phosphor that is excited by the second blue light to emit the second red light and a green phosphor that is excited by the second blue light to emit the green light; The display device according to claim 13.

17. The first light source is a first blue light-emitting element that emits the first blue light; and a first phosphor layer that includes a first red phosphor that is excited by the first blue light to emit the first red light; The second light source is a second blue light emitting element that emits a second blue light; a green light emitting element that emits the green light; a second phosphor layer including a second red phosphor that is excited by both the second blue light and the green light to emit the second red light; and have The display device according to claim 11.

18. The half width of the maximum peak of the first red light is narrower than the half width of the maximum peak of the second red light. The display device according to claim 13.

19. the intensity distribution of the first red light with respect to wavelength exhibits a bright line spectrum; The intensity distribution of the second red light with respect to wavelength exhibits a continuous spectrum. The display device according to claim 13.

20. The second light source further includes a blue light component cut filter that prevents transmission of blue light components. The display device according to claim 11.

Images