Backlight module and display device

Abstract

The invention provides a backlight module. The backlight module comprises a plurality of first light-emitting units, a plurality of second light-emitting units and a modulation module. Each first light emitting unit is used for emitting first light and second light; each second light emitting unit is used for emitting third light; the modulation module is used for receiving the first light, the second light and the third light, modulating the first light, the second light and the third light into illumination light and then emitting the illumination light; wherein the first light and the second light are used for complementing the light intensity of the third light in the first wave band; the full width at half maximum (FWHM) of the illumination light at the first wavelength meets the following condition: FWHM is more than 0nm and less than 30nm; the maximum effective light intensity of the illumination light in the range of the first wave band is larger than 5000 cd / m < 2 >, and the first wavelength is located in the first wave band. The invention further provides a display device comprising the backlight module.

Description

Technical Field

[0001] The present application relates to the field of displays, and in particular, to a backlight module and a display device. Background Art

[0002] In recent years, the usage rate of light-emitting diode (LED) backlight modules in the display field has been continuously increasing. Especially in liquid crystal display (LCD) devices, the performance of LED backlight modules directly affects the color performance and visual experience of the screen. Traditional LED backlight modules mostly adopt a single type of light source architecture. However, it is difficult to simultaneously achieve high contrast, high brightness, and wide color gamut with a single type of light source architecture. Summary of the Invention

[0003] A first aspect of the present application provides a backlight module, including: A plurality of first light-emitting units, each of the first light-emitting units being configured to emit a first light and a second light; A plurality of second light-emitting units, each of the second light-emitting units being configured to emit a third light; and A modulation module, configured to receive the first light, the second light, and the third light, and configured to modulate the first light, the second light, and the third light into illumination light and then emit the illumination light; wherein, the first light and the second light are used to supplement the light intensity of the third light in a first band; the full width at half maximum (FWHM) of the illumination light at a first wavelength satisfies: 0 nm < FWHM < 30 nm; the maximum effective light intensity of the illumination light within the range of the first band is greater than 5000 cd / m 2 , and the first wavelength is located within the first band.

[0004] The backlight module provided by the embodiments of the present application, by providing a plurality of first light-emitting units, a plurality of second light-emitting units, and a modulation module, each first light-emitting unit is configured to emit a first light and a second light, each second light-emitting unit is configured to emit a third light, the modulation module receives and is configured to modulate the first light, the second light, and the third light into illumination light and then emit the illumination light, so that mixed light can be output. The first light and the second light are used to supplement the light intensity of the third light in the first band, which can make up for the color deficiency of the second light-emitting unit in the first band. The full width at half maximum (FWHM) of the illumination light at the first wavelength satisfies: 0 nm < FWHM < 30 nm; which is beneficial to improving the color gamut coverage rate, and thus is beneficial to achieving a wide color gamut; the maximum effective light intensity of the illumination light within the range of the first band is greater than 5000 cd / m 2, the first wavelength is located in the first band, which can increase the brightness of the illumination light in the first band, thereby contributing to improving the contrast of the backlight module, and further facilitating the simultaneous achievement of high brightness, high contrast, and wide color gamut.

[0005] In one embodiment, the modulation module includes a diffusion plate, and the diffusion plate includes a first light-emitting surface and a first light-incident surface opposite to the first light-emitting surface; A plurality of the first light-emitting units and a plurality of the second light-emitting units are simultaneously disposed on a side of the first light-incident surface away from the first light-emitting surface; the diffusion plate is configured to mix and diffuse the first light, the second light, and the third light into the illumination light, and the first light-emitting surface is configured to emit the illumination light.

[0006] In one embodiment, a plurality of the first light-emitting units and a plurality of the second light-emitting units are arranged in a matrix; The sum of the light intensity magnitudes of the first light and the second light emitted by the plurality of first light-emitting units is equal to the light intensity magnitude of the third light emitted by the plurality of second light-emitting units.

[0007] In one embodiment, a plurality of the first light-emitting units and a plurality of the second light-emitting units are arranged in a matrix; The light intensity magnitude of the first light emitted by the plurality of first light-emitting units is equal to the light intensity magnitude of the second light, the light intensity magnitude of the first light emitted by the plurality of first light-emitting units is equal to the light intensity magnitude of the third light emitted by the plurality of second light-emitting units, and the number of the second light-emitting units is inversely proportional to the average value of the light intensity magnitudes of the third light emitted by the plurality of second light-emitting units.

[0008] In one embodiment, the modulation module includes a light guide plate, and the plurality of first light-emitting units and the plurality of second light-emitting units emit the first light, the second light, and the third light toward the light guide plate; The sum of the light intensity magnitudes of the first light and the second light emitted by the plurality of first light-emitting units is equal to the light intensity magnitude of the third light emitted by the plurality of second light-emitting units.

[0009] In one embodiment, the light guide plate includes a second light-emitting surface and a first side surface and a second side surface respectively connected to the second light-emitting surface, and the first side surface and the second side surface are opposite to each other; The plurality of first light-emitting units are disposed on a side of the first side surface away from the second side surface, and the plurality of first light-emitting units emit the first light and the second light toward the first side surface; The plurality of second light-emitting units are disposed on a side of the second side surface away from the first side surface, and the plurality of second light-emitting units emit the third light toward the second side surface.

[0010] In one embodiment, the light guide plate includes a second light-emitting surface, a first side surface and a second side surface that are respectively connected to the second light-emitting surface, and the first side surface and the second side surface are opposite to each other; The plurality of first light-emitting units and the plurality of second light-emitting units are simultaneously disposed on a side of the first side surface away from the second side surface and a side of the second side surface away from the first side surface.

[0011] In one embodiment, each of the first light-emitting units includes a first sub-light-emitting layer and a second sub-light-emitting layer; the first sub-light-emitting layer is configured to emit the first light; the second sub-light-emitting layer is configured to emit the second light; The ratio of the light intensity of the first light emitted by the first sub-light-emitting layer to the light intensity of the second light emitted by the second sub-light-emitting layer ranges from 1:1 to 1:2.

[0012] In one embodiment, each of the first light-emitting units further includes a first substrate layer; the first sub-light-emitting layer and the second sub-light-emitting layer are stacked on the first substrate layer, and the second sub-light-emitting layer is disposed between the first sub-light-emitting layer and the first substrate layer; The projected area of the first sub-light-emitting layer on the first substrate layer is equal to the projected area of the second sub-light-emitting layer on the first substrate layer.

[0013] In one embodiment, each of the first light-emitting units further includes a first substrate layer; the second sub-light-emitting layer is stacked on the first substrate layer; the first sub-light-emitting layer is disposed on a side of the second sub-light-emitting layer away from the first substrate layer; The ratio of the projected area of the first sub-light-emitting layer on the first substrate layer to the projected area of the second sub-light-emitting layer on the first substrate layer is 1:2.

[0014] In one embodiment, the thickness h1 of the first sub-light-emitting layer satisfies: 0 μm < h1 < 20 μm; the thickness h2 of the second sub-light-emitting layer satisfies: 0 μm < h2 < 20 μm.

[0015] In one embodiment, the distance between two adjacent first light-emitting units and second light-emitting units, between two adjacent first light-emitting units, or between two adjacent second light-emitting units ranges from 0.1 mm to 20 mm.

[0016] In one embodiment, the distance between the white point coordinates of the first light-emitting unit in the CIE standard color space and the white point coordinates of the second light-emitting unit in the CIE standard color space ranges from ±0.05.

[0017] The second aspect of the present application provides a display device, including: The backlight module described in any of the above embodiments, the backlight module is used to emit the illumination light.

[0018] The display device provided by the embodiments of the present application, by setting the backlight module described in any of the above embodiments, the modulation module in the backlight module receives and is used to modulate the first light, the second light, and the third light into illumination light and then emit it, so that mixed light output can be achieved. The first light and the second light are used to supplement the light intensity of the third light in the first band, which can make up for the color deficiency of the second light-emitting unit in the first band. The full width at half maximum FWHM of the illumination light at the first wavelength satisfies: 0nm < FWHM < 30nm; it is beneficial to improve the color gamut coverage rate, and thus beneficial to achieve a wide color gamut; the maximum effective light intensity of the illumination light within the range of the first band is greater than 5000 cd / m 2 , the first wavelength is located in the first band, which can improve the brightness of the illumination light in the first band, is beneficial to improve the contrast of the backlight module, and thus beneficial to the display device using the backlight module to simultaneously achieve high brightness, high contrast, and wide color gamut, and further beneficial to improve the user experience. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of a backlight module according to an embodiment of the present application.

[0020] Figure 2 It is a relationship diagram of the effective light intensity and wavelength of a backlight module according to an embodiment of the present application.

[0021] Figure 3 It is a schematic structural diagram of a backlight module according to another embodiment of the present application.

[0022] Figure 4 It is a schematic structural diagram of a backlight module according to still another embodiment of the present application.

[0023] Figure 5 It is a schematic structural diagram of a backlight module according to other embodiments of the present application.

[0024] Figure 6 It is a schematic structural diagram of a first light-emitting unit according to an embodiment of the present application.

[0025] Figure 7 It is a schematic structural diagram of a first light-emitting unit according to another embodiment of the present application.

[0026] Figure 8 It is a schematic structural diagram of a display device according to an embodiment of the present application.

[0027] Main Component Symbol Description: Backlight module 100 First light-emitting unit 1 The first substrate layer 11 The first semiconductor layer 12 The first sub-light-emitting layer 13 The second sub-light-emitting layer 14 The second semiconductor layer 15 The second substrate layer 16 The connection layer 17 The second light-emitting unit 2 The modulation module 3 The diffusion plate 31 The first light-emitting surface 311 The first light-incident surface 312 The light guide plate 33 The second light-emitting surface 331 The first side surface 332 The second side surface 333 The display device 600 The liquid crystal cell 61 The color filter 63 The pitch D The thicknesses h1, h2 The first light L1 The second light L2 The third light L3 The illumination light La The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0029] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application.

[0030] In order to further elaborate on the technical means and effects adopted by the present application to achieve the predetermined purpose, the following detailed description of the present application is made in conjunction with the drawings and preferred embodiments.

[0031] Please refer to Figure 1 and Figure 2, the backlight module 100 of the embodiment of the present application includes a plurality of first light-emitting units 1, a plurality of second light-emitting units 2, and a modulation module 3. Each first light-emitting unit 1 is configured to emit a first light L1 and a second light L2. Each second light-emitting unit 2 is configured to emit a third light L3. The modulation module 3 is configured to receive the first light L1, the second light L2, and the third light L3, and is configured to modulate the first light L1, the second light L2, and the third light L3 into illumination light La and then emit it.

[0032] The full width at half maximum (FWHM) of the first light L1 and the second light L2 at the first wavelength is less than the full width at half maximum (FWHM) of the third light L3 at the first wavelength (the first wavelength is in the first band), that is, the light intensities of the first light L1 and the second light L2 in the first band have significant peaks. The first light L1 and the second light L2 are used to supplement the light intensity of the third light L3 in the first band. That is, the monochromaticity of the first light-emitting unit 1 in the first band is better than that of the second light-emitting unit 2, so that the first light-emitting unit 1 can make up for the disadvantage of the weaker monochromaticity of the second light-emitting unit 2 in the first band, that is, it can make up for the color deficiency of the second light-emitting unit 2 in the first band; and the light intensities of the first light L1 and the second light L2 in other bands except the first band (such as Figure 2 600nm - 660nm in

[0033] also have significant peaks, that is, the monochromaticity of the first light-emitting unit 1 in other bands except the first band is also better than that of the second light-emitting unit 2, so that the first light-emitting unit 1 can also make up for the disadvantage of the weaker monochromaticity of the second light-emitting unit 2 in other bands except the first band.

[0034] In this embodiment, the first wavelength band may be 500 nm - 600 nm, that is, the first wavelength band is the region from green light to yellow light in the visible spectrum. The first wavelength is within the first wavelength band. For example, the first wavelength may be any value among 500 nm, 510 nm, 520 nm, 525 nm, 527 nm, 530 nm, 540 nm, 550 nm, 560 nm, 570 nm, 580 nm, 590 nm, and 600 nm. Since the human eye is sensitive to green light, that is, sensitive to the light in the first wavelength band, when the mixed-modulated illumination light La has good luminous brightness and good monochromaticity in the first wavelength band, compared with the backlight module composed of a single light-emitting unit, it is beneficial to improve the color gamut coverage and luminous brightness, and further beneficial to simultaneously achieve high brightness, high contrast, and wide color gamut, and further beneficial to improve the usage experience of the display device using the backlight module 100.

[0035] Specifically, the full width at half maximum (FWHM) of the illumination light La at the first wavelength satisfies: 0 nm < FWHM < 30 nm, and the maximum effective light intensity of the illumination light La within the range of the first wavelength band is greater than 5000 cd / m 2 . The full width at half maximum (FWHM) of the illumination light La at the first wavelength may be any value among 1 nm, 2 nm, 3 nm, 4 nm, 5 nm, 6 nm, 7 nm, 8 nm, 9 nm, 10 nm, 11 nm, 12 nm, 13 nm, 14 nm, 15 nm, 16 nm, 17 nm, 18 nm, 19 nm, 20 nm, 21 nm, 22 nm, 23 nm, 24 nm, 25 nm, 26 nm, 27 nm, 28 nm, and 29 nm. The maximum effective light intensity of the illumination light La within the range of the first wavelength band may be 5100 cd / m 2 , 5300 cd / m 2 , 5500 cd / m 2 , 5700 cd / m 2 , 5900 cd / m 2 , 6000 cd / m 2 , 6500 cd / m 2 , 7000 cd / m 2 , 7500 cd / m 2 , 8000 cd / m 2、 8500 cd / m 2 , 9000 cd / m 2 , 9500 cd / m 2 , 10000 cd / m 2 , 20000 cd / m 2 , 30000 cd / m 2 and 40000 cd / m 2Any value among them. In other embodiments, the first band may also be 400nm - 500nm or 600nm - 700nm, and the present application does not limit it.

[0036] When the full width at half maximum FWHM of the illumination light La at the first wavelength and the maximum effective light intensity of the illumination light La within the range of the first band satisfy the above relationship, the monochromaticity of the illumination light La within the first band can be improved, thereby ensuring the proportion of partial light of the illumination light La within the first band. Compared with the backlight module composed of a single light-emitting unit, it is beneficial to improve the color gamut coverage and the light-emitting brightness, and further beneficial to simultaneously achieve high brightness, high contrast, and wide color gamut, and further beneficial to improve the usage experience of the display device applying the backlight module 100.

[0037] The backlight module 100 provided by the embodiments of the present application, by setting a plurality of first light-emitting units 1, a plurality of second light-emitting units 2, and a modulation module 3, each first light-emitting unit 1 is used to emit a first light L1 and a second light L2, each second light-emitting unit 2 is used to emit a third light L3, and the modulation module 3 receives and is used to modulate the first light L1, the second light L2, and the third light L3 into an illumination light La and then emits it, so as to output mixed light. The first light L1 and the second light L2 are used to supplement the light intensity of the third light L3 within the first band, and can make up for the color deficiency of the second light-emitting unit 2 within the first band. The full width at half maximum FWHM of the illumination light La at the first wavelength satisfies: 0nm < FWHM < 30nm; it is beneficial to improve the color gamut coverage, and thus beneficial to achieve a wide color gamut; the maximum effective light intensity of the illumination light La within the range of the first band is greater than 5000cd / m 2 , the first wavelength is located within the first band, which can improve the brightness of the illumination light La within the first band, thereby being beneficial to improving the contrast of the backlight module 100, and further beneficial to simultaneously achieving high brightness, high contrast, and wide color gamut.

[0038] In some embodiments, the modulation module 3 includes a diffusion plate 31. The diffusion plate 31 includes a first light-emitting surface 311 and a first light-incident surface 312 opposite to the first light-emitting surface 311. The first light-emitting surface 311 and the first light-incident surface 312 are substantially rectangular. A plurality of first light-emitting units 1 and a plurality of second light-emitting units 2 are simultaneously arranged on the side of the first light-incident surface 312 away from the first light-emitting surface 311. The plurality of first light-emitting units 1 and the plurality of second light-emitting units 2 emit the first light L1, the second light L2, and the third light L3 towards the diffusion plate 31. The diffusion plate 31 is used to mix and diffuse the first light L1, the second light L2, and the third light L3 into an illumination light La, and the first light-emitting surface 311 is used to emit the illumination light La.

[0039] In some embodiments, multiple first light-emitting units 1 and multiple second light-emitting units 2 are arranged in a matrix, and the first light-emitting units 1 and the second light-emitting units 2 in the same row or the same column are alternately arranged at equal intervals. The sum of the light intensity magnitudes of the first light L1 and the second light L2 emitted by the multiple first light-emitting units 1 is equal to the light intensity magnitude of the third light L3 emitted by the multiple second light-emitting units 2, that is, the light intensity magnitude of the light rays (the first light L1 and the second light L2) emitted by the multiple first light-emitting units 1 is equal to the light intensity magnitude of the light rays (the third light L3) emitted by the multiple second light-emitting units 2. Specifically, the sum of the light intensity magnitudes of the first light L1 and the second light L2 emitted by each first light-emitting unit 1 is equal, the light intensity magnitude of the third light L3 emitted by each second light-emitting unit 2 is also equal, and the number ratio of the first light-emitting units 1 and the second light-emitting units 2 in the backlight module 100 is 1:1.

[0040] By setting the sum of the light intensity magnitudes of the first light L1 and the second light L2 emitted by the multiple first light-emitting units 1 to be equal to the light intensity magnitude of the third light L3 emitted by the multiple second light-emitting units 2, the diffusion plate 31 can mix the light rays (the first light L1 and the second light L2) emitted by the multiple first light-emitting units 1 with equal light intensity magnitudes and the light rays (the third light L3) emitted by the multiple second light-emitting units 2; when the light rays (the first light L1 and the second light L2) emitted by the first light-emitting units 1 have a good color gamut coverage rate and the light rays (the third light L3) emitted by the second light-emitting units 2 have a good luminous brightness, the diffusion plate 31 can mix the light rays emitted by the two types of light-emitting units more uniformly, that is, the illumination light La after mixing by the diffusion plate 31 has the advantages of the light rays (the first light L1 and the second light L2) emitted by the multiple first light-emitting units 1 and the light rays (the third light L3) emitted by the multiple second light-emitting units 2, which is beneficial to improving the brightness of the backlight module 100, beneficial to improving the color gamut coverage rate of the backlight module 100, and thus beneficial to the backlight module 100 to achieve high brightness and wide color gamut simultaneously.

[0041] In other embodiments, the sum of the light intensity magnitudes of the first light L1 and the second light L2 emitted by each first light-emitting unit 1 may not be equal, the light intensity magnitude of the third light L3 emitted by each second light-emitting unit 2 may not be equal, and the number ratio of the first light-emitting units 1 and the second light-emitting units 2 in the backlight module 100 may also be other values, such as 1:2 or 1:3, as long as the sum of the light intensity magnitudes of the first light L1 and the second light L2 emitted by the multiple first light-emitting units 1 is equal to the light intensity magnitude of the third light L3 emitted by the multiple second light-emitting units 2, it is within the protection scope of this application.

[0042] Please refer to Figure 2 and Figure 3, in some embodiments, the plurality of first light-emitting units 1 and the plurality of second light-emitting units 2 are arranged in a matrix. The light intensity of the first light L1 emitted by the plurality of first light-emitting units 1 is equal to the light intensity of the second light L2, and the light intensity of the first light L1 emitted by the plurality of first light-emitting units 1 is equal to the light intensity of the third light L3 emitted by the plurality of second light-emitting units 2. That is, the light intensity of the first light L1 emitted by the plurality of first light-emitting units 1 is equal to the light intensity of the second light L2 and is also equal to the light intensity of the third light L3 emitted by the plurality of second light-emitting units 2.

[0043] In this embodiment, the number ratio of the first light-emitting units 1 to the second light-emitting units 2 in the backlight module 100 is 2:1. The light intensity of the first light L1 emitted by each first light-emitting unit 1 is equal to the light intensity of the second light L2; and the light intensity of the first light L1 (or the light intensity of the second light L2) emitted by one first light-emitting unit 1 is equal to the light intensity of the third light L3 emitted by one second light-emitting unit 2. That is, the sum of the light intensities of the first light L1 and the second light L2 emitted by one first light-emitting unit 1 is equal to the light intensity of the third light L3 emitted by two second light-emitting units 2. The number of the second light-emitting units 2 is inversely proportional to the average value of the light intensities of the third light L3 emitted by the plurality of second light-emitting units 2; that is, to satisfy that the light intensity of the first light L1 emitted by the plurality of first light-emitting units 1 is equal to the light intensity of the third light L3 emitted by the plurality of second light-emitting units 2, the smaller the light intensity of the third light L3 emitted by a single second light-emitting unit 2, the more the number of the second light-emitting units 2.

[0044] In other embodiments, the number ratio of the first light-emitting units 1 to the second light-emitting units 2 in the backlight module 100 can also be other ratios, such as 3:1, 4:1, 1:2, 1:3 or 1:4, which is not limited in this application.

[0045] By setting the light intensity of the first light L1 emitted by the multiple first light-emitting units 1 to be equal to the light intensity of the second light L2, setting the light intensity of the first light L1 emitted by the multiple first light-emitting units 1 to be equal to the light intensity of the third light L3 emitted by the multiple second light-emitting units 2, and making the number of the second light-emitting units 2 inversely proportional to the average value of the light intensity of the third light L3 emitted by the multiple second light-emitting units 2, the diffusion plate 31 can mix the first light L1, the second light L2, and the third light L3 with equal light intensity; when the first light L1 and the second light L2 have good color gamut coverage and luminous brightness, and the third light L3 has good luminous brightness, the diffusion plate 31 can mix the three lights emitted by the two types of light-emitting units more evenly. That is, the illumination light La after mixing by the diffusion plate 31 has the advantages of the first light L1 and the second light L2 emitted by the multiple first light-emitting units 1 and the third light L3 emitted by the multiple second light-emitting units 2, which is beneficial to further improving the brightness of the backlight module 100, beneficial to further improving the color gamut coverage of the backlight module 100, and thus beneficial to the backlight module 100 to achieve high brightness and wide color gamut simultaneously.

[0046] Please refer to Figure 1 , Figure 2 and Figure 4 , in some embodiments, the modulation module 3 includes a light guide plate 33, and the multiple first light-emitting units 1 and the multiple second light-emitting units 2 emit the first light L1, the second light L2, and the third light L3 toward the light guide plate 33. The light guide plate 33 is configured to receive the first light L1, the second light L2, and the third light L3, and configured to mix the first light L1, the second light L2, and the third light L3 into the illumination light La and then emit it. The sum of the light intensity of the first light L1 and the second light L2 emitted by the multiple first light-emitting units 1 is equal to the light intensity of the third light L3 emitted by the multiple second light-emitting units 2.

[0047] By setting the sum of the light intensity magnitudes of the first light L1 and the second light L2 emitted by multiple first light-emitting units 1 to be equal to the light intensity magnitude of the third light L3 emitted by multiple second light-emitting units 2, the light guide plate 33 can mix the light rays (the first light L1 and the second light L2) emitted by multiple first light-emitting units 1 with equal light intensity magnitudes and the light rays (the third light L3) emitted by multiple second light-emitting units 2; when the light rays (the first light L1 and the second light L2) emitted by the first light-emitting units 1 have a good color gamut coverage rate and the light rays (the third light L3) emitted by the second light-emitting units 2 have a good luminous brightness, the light guide plate 33 can mix the light rays emitted by the two types of light-emitting units more uniformly, that is, the illumination light La after mixing by the light guide plate 33 has the advantages of the light rays (the first light L1 and the second light L2) emitted by multiple first light-emitting units 1 and the light rays (the third light L3) emitted by multiple second light-emitting units 2, which is beneficial to improving the brightness of the backlight module 100, beneficial to improving the color gamut coverage rate of the backlight module 100, and thus beneficial to the backlight module 100 to achieve high brightness and wide color gamut simultaneously.

[0048] Specifically, the light guide plate 33 includes a second light-emitting surface 331, a first side surface 332 and a second side surface 333 that are respectively connected to the second light-emitting surface 331, and the first side surface 332 and the second side surface 333 are opposite to each other. Multiple first light-emitting units 1 are arranged on the side of the first side surface 332 away from the second side surface 333, and multiple first light-emitting units 1 emit the first light L1 and the second light L2 toward the first side surface 332. Multiple second light-emitting units 2 are arranged on the side of the second side surface 333 away from the first side surface 332, and multiple second light-emitting units 2 emit the third light L3 toward the second side surface 333. By arranging multiple first light-emitting units 1 on the side of the first side surface 332 away from the second side surface 333 and multiple second light-emitting units 2 on the side of the second side surface 333 away from the first side surface 332, that is, only one type of light-emitting unit is arranged on one side of the light guide plate 33, which is beneficial to reducing the processing difficulty and thus beneficial to reducing the processing cost.

[0049] Please refer to Figure 5 , in some embodiments, multiple first light-emitting units 1 and multiple second light-emitting units 2 are simultaneously arranged on the side of the first side surface 332 away from the second side surface 333 and the side of the second side surface 333 away from the first side surface 332, and multiple first light-emitting units 1 and multiple second light-emitting units 2 located on the same side are alternately arranged.

[0050] By simultaneously disposing a plurality of first light-emitting units 1 and a plurality of second light-emitting units 2 on one side of the first side surface 332 away from the second side surface 333 and on one side of the second side surface 333 away from the first side surface 332, that is, two types of light-emitting units (the first light-emitting unit 1 and the second light-emitting unit 2) are disposed on one side of the light guide plate 33, it is beneficial for the light guide plate 33 to uniformly mix the first light L1, the second light L2, and the third light L3 into the illumination light La, and it is beneficial for the mixed illumination light La to have the advantages of the light rays emitted by the plurality of first light-emitting units 1 (the first light L1 and the second light L2) and the light rays emitted by the plurality of second light-emitting units 2 (the third light L3).

[0051] Please also refer to Figure 1 and Figure 2 , in some embodiments, the distance D between two adjacent first light-emitting units 1 and second light-emitting units 2, two adjacent first light-emitting units 1 or two adjacent second light-emitting units 2 ranges from 0.1 mm to 20 mm. The distance D between two adjacent first light-emitting units 1 and second light-emitting units 2, two adjacent first light-emitting units 1 or two adjacent second light-emitting units 2 can be any value among 0.1 mm, 0.5 mm, 0.8 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, and 20 mm.

[0052] When the above relationship is satisfied, the distance D between two adjacent first light-emitting units 1 and second light-emitting units 2, two adjacent first light-emitting units 1 or two adjacent second light-emitting units 2 is neither too large nor too small, and two adjacent first light-emitting units 1 and second light-emitting units 2, two adjacent first light-emitting units 1 or two adjacent second light-emitting units 2 do not interfere with each other, which is beneficial for reducing the processing difficulty and beneficial for the modulation module to mix and diffuse the first light L1, the second light L2, and the third light L3 into the illumination light La.

[0053] Further, the distance between the white point coordinates of the first light-emitting unit 1 in the standard color space of the International Commission on Illumination (CIE) and the white point coordinates of the second light-emitting unit 2 in the CIE standard color space ranges from ±0.05. The distance between the white point coordinates of the first light-emitting unit 1 in the CIE standard color space and the white point coordinates of the second light-emitting unit 2 in the CIE standard color space can be any value among -0.05, -0.04, -0.03, -0.02, -0.01, 0, +0.01, +0.02, +0.03, +0.04, and +0.05. When the above relationship is satisfied, the first light-emitting unit 1 and the second light-emitting unit 2 are approximately in the same color temperature range in terms of color perception, which is beneficial to reducing the color difference of the backlight module 100, making the color difference of the backlight module 100 lower than the human eye perception threshold; when the above backlight module 100 is applied to a display device, it is beneficial to avoid color patches on the screen and reduce the discomfort of the human eye.

[0054] Please refer to Figure 1 and Figure 6 In some embodiments, each first light-emitting unit 1 includes a first substrate layer 11, a first semiconductor layer 12, a first sub-light-emitting layer 13, a second sub-light-emitting layer 14, and a second semiconductor layer 15. The first semiconductor layer 12, the second sub-light-emitting layer 14, the first sub-light-emitting layer 13, and the second semiconductor layer 15 are sequentially stacked on the first substrate layer 11. The second sub-light-emitting layer 14 is disposed between the first sub-light-emitting layer 13 and the first substrate layer 11, and the first semiconductor layer 12 is disposed between the second sub-light-emitting layer 14 and the first substrate layer 11.

[0055] The first sub-light-emitting layer 13 is configured to emit a first light L1, and the second sub-light-emitting layer 14 is configured to emit a second light L2. The material of the first substrate layer 11 can be any one of sapphire, silicon, and silicon carbide. The materials of the first semiconductor layer 12 and the second semiconductor layer 15 can be any one of gallium nitride, gallium arsenide, and aluminum gallium nitride. Specifically, the projected area of the first sub-light-emitting layer 13 on the first substrate layer 11 is equal to the projected area of the second sub-light-emitting layer 14 on the first substrate layer 11.

[0056] The ratio of the light intensity of the first light L1 emitted by the first sub-light-emitting layer 13 to the light intensity of the second light L2 emitted by the second sub-light-emitting layer 14 ranges from 1:1 to 1:2. The ratio of the light intensity of the first light L1 emitted by the first sub-light-emitting layer 13 to the light intensity of the second light L2 emitted by the second sub-light-emitting layer 14 can be any value among 1:1, 1:1.2, 1:1.4, 1:1.6, 1:1.8, and 1:2.

[0057] When the above relationships are satisfied, the ratio of the light intensity of the first light L1 emitted by the first sub-light-emitting layer 13 to the light intensity of the second light L2 emitted by the second sub-light-emitting layer 14 is neither too large nor too small, that is, each first light-emitting unit 1 emits the first light L1 and the second light L2 with a suitable ratio, so that the mixed illumination light La has the first light L1 and the second light L2 with a suitable ratio; when the above backlight module 100 is applied to the display device 600, it is beneficial to improve the display effect; if the first light L1 has good luminous brightness and the second light L2 has good color coverage, it is beneficial for the backlight module 100 to achieve both high brightness and wide color gamut at the same time.

[0058] Please refer to Figure 1 、 Figure 6 and Figure 7 , in some embodiments, each first light-emitting unit 1 further includes a second substrate layer 16 and a connecting layer 17. The material of the second substrate layer 16 can be any one of sapphire, silicon, and silicon carbide. The first sub-light-emitting layer 13 and the second substrate layer 16 are stacked, and the first sub-light-emitting layer 13 is disposed on the side of the second sub-light-emitting layer 14 away from the first substrate layer 11. The ratio of the projection area of the first sub-light-emitting layer 13 on the first substrate layer 11 to the projection area of the second sub-light-emitting layer 14 on the first substrate layer 11 is 1:2. The connecting layer 17 is disposed between the first light-emitting layer and the second light-emitting layer and is used to connect the first light-emitting layer and the second light-emitting layer. After the first sub-light-emitting layer 13 and the second substrate layer 16 are formed, they are fixed to the side of the second sub-light-emitting layer 14 away from the first substrate layer 11 through the connecting layer 17, which is beneficial to reducing the processing difficulty and thus beneficial to reducing the processing cost.

[0059] In some embodiments, the thickness h1 of the first sub-light-emitting layer 13 satisfies: 0μm < h1 < 20μm. The thickness h1 of the first sub-light-emitting layer 13 can be any value among 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, and 19μm. The thickness h2 of the second sub-light-emitting layer 14 satisfies: 0μm < h2 < 20μm. The thickness h2 of the second sub-light-emitting layer 14 can be any value among 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, and 19μm. The thicknesses of the first sub-light-emitting layer 13 and the second sub-light-emitting layer 14 can be the same or different, and the present application does not make any restrictions.

[0060] When the thicknesses of the first sub-light-emitting layer 13 and the second sub-light-emitting layer 14 satisfy the above relationship, the first sub-light-emitting layer 13 and the second sub-light-emitting layer 14 can normally emit the first light L1 and the second light L2, and will not cause the volume of the first light-emitting unit 1 to be too large, which is beneficial to reducing the volume of the first light-emitting unit 1, and thus beneficial to reducing the volume of the backlight module 100.

[0061] The backlight module 100 provided by the embodiment of the present application, by providing a plurality of first light-emitting units 1, a plurality of second light-emitting units 2 and a modulation module 3, each first light-emitting unit 1 is used to emit the first light L1 and the second light L2, each second light-emitting unit 2 is used to emit the third light L3, and the modulation module 3 receives and is used to modulate the first light L1, the second light L2 and the third light L3 into illumination light La and then emit it, so that mixed light can be output. The first light L1 and the second light L2 are used to supplement the light intensity of the third light L3 in the first band, and can make up for the color deficiency of the second light-emitting unit 2 in the first band. The full width at half maximum FWHM of the illumination light La at the first wavelength satisfies: 0nm < FWHM < 30nm; it is beneficial to improve the color gamut coverage rate, and thus beneficial to realizing a wide color gamut; the maximum effective light intensity of the illumination light La within the range of the first band is greater than 5000cd / m 2 , the first wavelength is located in the first band, which can improve the brightness of the illumination light La in the first band, and thus is beneficial to improving the contrast of the backlight module 100, and further beneficial to simultaneously realizing high brightness, high contrast and wide color gamut.

[0062] Please refer to Figure 1 , Figure 2 and Figure 8 , the display device 600 of the embodiment of the present application includes the backlight module 100 in any of the above embodiments, and the backlight module 100 is used to emit the illumination light La.

[0063] Please refer to Table 1. Table 1 shows the test results of Comparative Example 1 of the display device with a backlight module composed of a single light-emitting unit and the display device of the embodiment of the present application.

[0064] Table 1 Compared with the display device with a backlight module composed of a single light-emitting unit, the display device 600 of the embodiment of the present application uses the backlight module 100 in any of the above embodiments, and has a better color gamut coverage rate and luminous brightness. The luminous brightness of the display device 600 is increased by 23.8% compared with Comparative Example 1. The NTSC color gamut of the display device 600 is greater than 98%, and the contrast ratio CR of the display device 600 is greater than 100000:1. It can simultaneously realize high brightness, high contrast and wide color gamut, and thus is beneficial to improving the usage experience of the display device using the backlight module 100.

[0065] The display device 600 further includes a display liquid crystal cell 61 and a color filter layer 63. The display liquid crystal cell 61 is disposed on the light-emitting side of the backlight module 100 and is located between the color filter layer 63 and the backlight module 100. The display liquid crystal cell 61 is configured to receive the light emitted by the diffusion module 63 and to control the light transmittance by regulating the arrangement of liquid crystal molecules through an electric field. The color filter layer 63 is configured to selectively transmit light of a specific wavelength. The display liquid crystal cell 61 and the color filter layer 63 jointly modulate the illumination light into image light (not shown in the figure) and then emit it.

[0066] In the display device 600 provided by the embodiment of the present application, by providing the backlight module 100 in any of the above embodiments, the modulation module 3 in the backlight module 100 receives and is configured to modulate the first light L1, the second light L2, and the third light L3 into illumination light La and then emit it, so that mixed light can be output. The first light L1 and the second light L2 are used to supplement the light intensity of the third light L3 in the first band, and can make up for the color deficiency of the second light-emitting unit 2 in the first band. The full width at half maximum FWHM of the illumination light La at the first wavelength satisfies: 0 nm < FWHM < 30 nm; which is beneficial to improving the color gamut coverage rate, and thus is beneficial to realizing a wide color gamut. The maximum effective light intensity of the illumination light La within the range of the first band is greater than 5000 cd / m 2 , the first wavelength is located in the first band, which can increase the brightness of the illumination light La in the first band, is beneficial to improving the contrast of the backlight module 100, and thus is beneficial to the display device 600 using the backlight module 100 to simultaneously achieve high brightness, high contrast, and a wide color gamut, and further is beneficial to improving the user experience.

[0067] The above embodiments are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A backlight module, characterized in that, Comprising: A plurality of first light-emitting units, each of the first light-emitting units being configured to emit first light and second light; A plurality of second light-emitting units, each of the second light-emitting units being configured to emit third light; And A modulation module, configured to receive the first light, the second light, and the third light, and configured to modulate the first light, the second light, and the third light into illumination light and then emit it; Wherein, the first light and the second light are used to supplement the light intensity of the third light in the first wavelength band; the full width at half maximum (FWHM) of the illumination light at the first wavelength satisfies: 0 nm < FWHM < 30 nm; the maximum effective light intensity of the illumination light within the range of the first wavelength band is greater than 5000 cd / m 2 , and the first wavelength is located within the first wavelength band.

2. The backlight module according to claim 1, wherein, The modulation module includes a diffusion plate, the diffusion plate including a first light-emitting surface and a first light-incident surface opposite to the first light-emitting surface; The plurality of first light-emitting units and the plurality of second light-emitting units are simultaneously disposed on a side of the first light-incident surface away from the first light-emitting surface; the diffusion plate is configured to mix and diffuse the first light, the second light, and the third light into the illumination light, and the first light-emitting surface is configured to emit the illumination light.

3. The backlight module according to claim 2, wherein The plurality of first light-emitting units and the plurality of second light-emitting units are arranged in a matrix; The sum of the light intensity magnitudes of the first light and the second light emitted by the plurality of first light-emitting units is equal to the light intensity magnitude of the third light emitted by the plurality of second light-emitting units.

4. The backlight module according to claim 2, characterized in that, The plurality of first light-emitting units and the plurality of second light-emitting units are arranged in a matrix; The light intensity magnitude of the first light emitted by the plurality of first light-emitting units is equal to the light intensity magnitude of the second light, The light intensity magnitude of the first light emitted by the plurality of first light-emitting units is equal to the light intensity magnitude of the third light emitted by the plurality of second light-emitting units, and the number of the second light-emitting units is inversely proportional to the average value of the light intensity magnitudes of the third light emitted by the plurality of second light-emitting units.

5. The backlight module according to claim 1, wherein The modulation module includes a light guide plate, and the plurality of first light-emitting units and the plurality of second light-emitting units emit the first light, the second light, and the third light toward the light guide plate; The sum of the light intensity magnitudes of the first light and the second light emitted by the plurality of first light-emitting units is equal to the light intensity magnitude of the third light emitted by the plurality of second light-emitting units.

6. The backlight module according to claim 5, wherein The light guide plate includes a second light-emitting surface, a first side surface, and a second side surface respectively connected to the second light-emitting surface, and the first side surface and the second side surface are opposite to each other; The plurality of first light-emitting units are disposed on a side of the first side surface away from the second side surface, and the plurality of first light-emitting units emit the first light and the second light toward the first side surface; The plurality of second light-emitting units are disposed on a side of the second side surface away from the first side surface, and the plurality of second light-emitting units emit the third light toward the second side surface.

7. The backlight module according to claim 5, characterized in that, The light guide plate includes a second light-emitting surface, a first side surface, and a second side surface respectively connected to the second light-emitting surface, and the first side surface and the second side surface are opposite to each other; The plurality of first light-emitting units and the plurality of second light-emitting units are simultaneously disposed on a side of the first side surface away from the second side surface and a side of the second side surface away from the first side surface.

8. The backlight module according to claim 1, wherein Each of the first light-emitting units includes a first sub-light-emitting layer and a second sub-light-emitting layer; the first sub-light-emitting layer is configured to emit the first light; the second sub-light-emitting layer is configured to emit the second light; The range of the ratio of the light intensity of the first light emitted by the first sub-light-emitting layer to the light intensity of the second light emitted by the second sub-light-emitting layer is from 1:1 to 1:

2.

9. The backlight module according to claim 8, wherein Each of the first light-emitting units further includes a first substrate layer; the first sub-light-emitting layer and the second sub-light-emitting layer are stacked on the first substrate layer, and the second sub-light-emitting layer is disposed between the first sub-light-emitting layer and the first substrate layer; The projected area of the first sub-light-emitting layer on the first substrate layer is equal to the projected area of the second sub-light-emitting layer on the first substrate layer.

10. The backlight module according to claim 8, characterized in that, Each of the first light-emitting units further includes a first substrate layer; the second sub-light-emitting layer is stacked on the first substrate layer; the first sub-light-emitting layer is disposed on a side of the second sub-light-emitting layer away from the first substrate layer; The ratio of the projected area of the first sub-light-emitting layer on the first substrate layer to the projected area of the second sub-light-emitting layer on the first substrate layer is 1:

2.

11. The backlight module according to claim 8, characterized in that, The thickness h1 of the first sub-light-emitting layer satisfies: 0 μm < h1 < 20 μm; the thickness h2 of the second sub-light-emitting layer satisfies: 0 μm < h2 < 20 μm.

12. The backlight module according to claim 1, characterized in that, The spacing range between two adjacent first light-emitting units and second light-emitting units, between two adjacent first light-emitting units, or between two adjacent second light-emitting units is 0.1 mm - 20 mm.

13. The backlight module according to claim 1, wherein, The distance range between the white point coordinates of the first light-emitting unit in the CIE standard color space and the white point coordinates of the second light-emitting unit in the CIE standard color space is ±0.

05.

14. A display device, characterized in that, Comprising: The backlight module according to any one of claims 1-13, wherein the backlight module is configured to emit the illumination light.

Images