Backlight and display device

Abstract

The application relates to the technical field of display, in particular to a backlight light source and a display device. The backlight light source comprises a light emitting unit, the light emitting unit emits white light comprising blue light, green light and red light, the light emitting unit comprises a single-core multi-wavelength chip, the single-core multi-wavelength chip emits at least two wavelengths of light, the light emitted by the single-core multi-wavelength chip comprises blue light and at least one of green light and red light. By using the single-core multi-wavelength chip or the single-core multi-wavelength chip and color conversion materials in combination in the backlight light source, the color gamut of the backlight light source can be improved, the color gamut and the color coordinate have higher dynamic stability, three colors are highly spatially overlapped, there is no two-dimensional and three-dimensional color difference, the display color uniformity is good, the cost is reduced, the driving is simplified, the packaging process is simple, and the control method is simple.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a backlight and a display device. BACKGROUND

[0002] The color gamut of a display device is very important, the larger the color gamut is, the more colors can be reproduced. The backlight of an LCD display device plays a decisive role in the color gamut.

[0003] In the prior art, the backlight of an LCD display device mainly includes: a single-wavelength chip plus a fluorescent powder scheme, which is limited in color gamut improvement; a double-chip or multi-chip plus a fluorescent powder scheme, which has two-dimensional and three-dimensional color difference due to the multi-chip arrangement, and is prone to poor display color uniformity. Moreover, the double-chip or multi-chip scheme also has the problems of complex driving mode, complex packaging process, uneven control, and high cost. SUMMARY

[0004] Therefore, the present application provides a backlight and a display device to solve the problems of difficult color gamut improvement and poor display color uniformity caused by two-dimensional and three-dimensional color difference.

[0005] In one aspect, the present application provides a backlight, which includes a light-emitting unit, the light-emitting unit emits white light including blue light, green light and red light, the light-emitting unit includes a single-chip multi-wavelength chip, the single-chip multi-wavelength chip emits at least two different wavelengths of light, the light emitted by the single-chip multi-wavelength chip contains blue light and at least one of green light and red light.

[0006] When the light emitted by the single-chip multi-wavelength chip contains blue light and green light, the ratio of the brightness of the blue light to the brightness of the green light emitted by the single-chip multi-wavelength chip ranges from 1:1 to 1:15.

[0007] When the light emitted by the single-chip multi-wavelength chip contains blue light and red light, the ratio of the brightness of the blue light to the brightness of the red light emitted by the single-chip multi-wavelength chip ranges from 1:(1-5).

[0008] In some possible implementation manners, the single-chip multi-wavelength is pure electroluminescence or a combination of electroluminescence and photoluminescence.

[0009] In some possible implementation manners, the backlight also emits cyan light.

[0010] In some possible implementation manners, the light-emitting unit includes one single-chip multi-wavelength chip, and the white light is formed by mixing the multiple different wavelengths of light emitted by the single-chip multi-wavelength chip.

[0011] In some possible implementation manners, the light emitted by the single-chip multi-wavelength chip contains at least one wavelength of blue light, at least one wavelength of green light and at least one wavelength of red light.

[0012] In some possible implementations, the light emitting unit comprises a single-core multi-wavelength chip and at least one color conversion material, the color conversion material is configured to convert at least part of the light of at least one wavelength emitted by the single-core multi-wavelength chip into third light, different color conversion materials convert third light of different wavelengths, and the white light is formed by mixing the light of multiple wavelengths emitted by the single-core multi-wavelength chip and the third light converted by the color conversion material.

[0013] In some possible implementations, the color conversion material comprises a fluorescent powder or a quantum dot material.

[0014] In some possible implementations, the color conversion material comprises a green light conversion material, a red light conversion material, or a cyan light conversion material, the green light conversion material is configured to convert at least part of the light of at least one wavelength emitted by the single-core multi-wavelength chip into green light of at least one wavelength, the red light conversion material is configured to convert at least part of the light of at least one wavelength emitted by the single-core multi-wavelength chip into red light of at least one wavelength, and the cyan light conversion material is configured to convert at least part of the light of at least one wavelength emitted by the single-core multi-wavelength chip into cyan light of at least one wavelength.

[0015] In some possible implementations, the light emitting wavelength of the single-core multi-wavelength chip comprises a plurality of different wavelengths of blue light and a plurality of different wavelengths of green light, and the color conversion material comprises a red light conversion material, wherein a≥1 and b≥1.

[0016] In some possible implementations, the light emitting wavelength of the single-core multi-wavelength chip comprises a plurality of different wavelengths of blue light and a plurality of different wavelengths of green light, and the color conversion material comprises a green light conversion material and a red light conversion material, wherein a≥1 and b≥1.

[0017] In some possible implementations, the backlight light source is composed of backlight lamp beads, and the backlight lamp beads are formed by a single light emitting unit; and / or

[0018] the backlight lamp beads are formed by a plurality of same light emitting units; and / or

[0019] the backlight lamp beads are formed by different light emitting units.

[0020] The light emitting unit comprises a single-core multi-wavelength chip or a single-core multi-wavelength chip and a color conversion material.

[0021] In some possible implementations, the backlight light source is a surface light source, the surface light source is formed by a plurality of same or at least partially different light emitting units, and the light emitting unit comprises a single-core multi-wavelength chip or a single-core multi-wavelength chip and a color conversion material.

[0022] In some possible implementation manners, the light-emitting wavelengths of the single-chip multi-wavelength chip include a number of different wavelengths of blue light, b number of different wavelengths of cyan light, and c number of different wavelengths of green light, and the ratio of the brightness of the blue light, the brightness of the cyan light, and the brightness of the green light emitted by the single-chip multi-wavelength chip ranges from 1:(1-5):(1-10).

[0023] In some possible implementation manners, the light-emitting wavelengths of the single-chip multi-wavelength chip include a number of different wavelengths of blue light, b number of different wavelengths of cyan light, and c number of different wavelengths of green light, and the ratio of the brightness of the blue light, the brightness of the cyan light, and the brightness of the green light emitted by the single-chip multi-wavelength chip ranges from 1:(1-5):(1-10).

[0024] In some possible implementation manners, the light-emitting wavelengths of the single-chip multi-wavelength chip include a number of different wavelengths of blue light, b number of different wavelengths of cyan light, and c number of different wavelengths of green light, and the ratio of the brightness of the blue light, the brightness of the cyan light, and the brightness of the green light emitted by the single-chip multi-wavelength chip ranges from 1:(1-5):(1-10).

[0025] In some possible implementation manners, the light-emitting wavelengths of the single-chip multi-wavelength chip include a number of different wavelengths of blue light, b number of different wavelengths of cyan light, and c number of different wavelengths of green light, and the ratio of the brightness of the blue light, the brightness of the cyan light, and the brightness of the green light emitted by the single-chip multi-wavelength chip ranges from 1:(1-5):(1-10).

[0026] In some possible implementation manners, the white light is formed by compounding blue light, green light, and red light, and the ratio of the brightness of the blue light, the brightness of the green light, and the brightness of the red light in the backlight source ranges from 1:(5-15):(2-5).

[0027] In some possible implementation manners, the white light is formed by compounding blue light, green light, and red light, and the ratio of the brightness of the blue light, the brightness of the green light, and the brightness of the red light in the backlight source ranges from 1:(5-15):(2-5).

[0028] In some possible implementation manners, the white light is formed by compounding blue light, green light, and red light, and the ratio of the brightness of the blue light, the brightness of the green light, and the brightness of the red light in the backlight source ranges from 1:(5-15):(2-5).

[0029] The application provides a backlight light source and a display device. By using a single-core multi-wavelength chip emitting multiple different wavelengths of light or a single-core multi-wavelength chip emitting multiple different wavelengths of light in combination with a color conversion material, the color gamut is improved, the color gamut and color coordinates have higher dynamic stability, multiple different wavelengths of light are emitted from the vertical direction of a single-core multi-wavelength chip, three colors are highly spatially overlapped, there is no two-dimensional and three-dimensional color difference, the display color uniformity is good, the cost is reduced, the driving is simplified, the packaging process is simple, and the control method is simple. Thus, the problem of difficulty in improving the color gamut and poor display color uniformity caused by two-dimensional and three-dimensional color difference is solved.

[0030] When the single-core multi-wavelength chip contains green light or red light, because the green light and red light have a narrower spectral half-width than the phosphor and a narrower spectral half-width than the conventional green / red chip in the prior art, that is, the green light and red light are narrow-spectrum green light and red light, compared with wide-spectrum green phosphor or conventional green and red chips, the color gamut of the backlight can be improved by at least two levels or at least 20%. When the single-core multi-wavelength chip emits light including blue light and green light, compared with a conventional blue chip + green quantum dot material or green phosphor, the cost is low; compared with a conventional blue chip + green chip, the cost is low. When the single-core multi-wavelength chip emits light including blue light, green light and red light, compared with a conventional blue chip + green quantum dot material or green phosphor + red quantum dot material or red phosphor, the cost is low; compared with a conventional blue chip + green chip + red chip, the cost is low. Therefore, the use of a single-core multi-wavelength chip can reduce the cost, replace green conversion materials and red conversion materials, or replace conventional green chips and red chips. Moreover, compared with a conventional multi-chip solution, the use of a single-core multi-wavelength chip does not require additional chips, thereby reducing the number of driving chips, and thus the driving is simple and the control method is simple. The use of a single-core multi-wavelength chip also simplifies the packaging process due to the reduction or replacement of color conversion materials.

[0031] Preferably, when the single-core multi-wavelength chip used emits light in combination of electrical excitation and optical excitation, it contains a first light-emitting layer and a second light-emitting layer. The first light-emitting layer generates first light in an electrical excitation mode, and holes in the p-type semiconductor layer and electrons in the n-type semiconductor layer reach the first light-emitting layer, and recombination causes electrical excitation to emit first light. The first light excites the second light-emitting layer to generate second light in a photoexcitation mode. The second light-emitting layer generating photoexcitation is built between the p-type semiconductor layer and the n-type semiconductor layer, and the second light-emitting layer releases stress in advance, so that the EQE of the first light-emitting layer is improved, higher than the EQE of the conventional chip; the second light-emitting layer itself has good crystal quality, and multiple reflections and light absorption between PN, higher than the EQE of the conventional chip, so that the wavelength of the photoexcitation mechanism and the wavelength of the electrical excitation mechanism of the single-core multi-wavelength chip emitting light in combination of electrical excitation and optical excitation are both higher than the EQE of the conventional LED. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the light-emitting unit of the backlight source provided in the embodiments of this application;

[0034] Figure 2 for Figure 1 One of the schematic diagrams of the structure of a single-core multi-wavelength chip for backlight source shown;

[0035] Figure 3 for Figure 1 The second schematic diagram of the structure of a single-core multi-wavelength chip for the backlight source is shown.

[0036] Figure 4 for Figure 1 The third schematic diagram of the structure of a single-core multi-wavelength chip for the backlight source is shown.

[0037] Figure 5 A schematic diagram of a backlight LED bead for a backlight source provided in an embodiment of this application;

[0038] Figure 6 Another structural schematic diagram of the backlight lamp bead of the backlight source provided in the embodiments of this application;

[0039] Figure 7 A schematic diagram of another structure of the backlight source provided in the embodiments of this application;

[0040] Figure 8 This is one of the structural schematic diagrams of a packaging method for a light-emitting unit provided in an embodiment of this application;

[0041] Figure 9 A second schematic diagram of a packaging method for a light-emitting unit provided in an embodiment of this application;

[0042] Figure 10 This is the third schematic diagram of a packaging method for a light-emitting unit provided in an embodiment of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 100 - backlight light source; 10 - single-core multi-wavelength chip; 11 - p-type semiconductor layer; 12 - n-type semiconductor layer; 13 - first light-emitting layer; 131 - first sub-layer; 14 - second light-emitting layer; 141 - second sub-layer; 15 - isolation layer; 20 - backlight lamp bead; 30 - light-emitting unit; 40 - color conversion material. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiments of the present application will be described in more detail below in combination with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar notations represent the same or similar parts or parts having the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below in combination with the drawings.

[0046] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or indirect connection through an intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0048] The terms "first", "second", "third" (if any) in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0049] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or display that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or display.

[0050] The color gamut of a display device is very important; the larger the color gamut, the more colors it can reproduce. The backlight of an LCD display device plays a decisive role in the color gamut.

[0051] In existing technologies, the backlighting of LCD display devices mainly includes: a single-wavelength chip plus phosphor solution, which has limited color gamut improvement; a dual-chip or multi-chip plus phosphor solution, which, due to the multi-chip setup, suffers from two-dimensional and three-dimensional color differences, easily leading to poor color uniformity of the display, and also has complex driving methods, complex packaging processes, uneven control, and high costs; and a multi-chip solution, which also suffers from two-dimensional and three-dimensional color differences, easily leading to poor color uniformity of the display, and also has complex driving methods, complex packaging processes, uneven control, and high costs.

[0052] After repeated consideration and verification, the inventors discovered that if the light-emitting unit in the backlight includes a single-core multi-wavelength chip, the color gamut will be greatly improved, and the color gamut and color coordinates will have higher dynamic stability. Simultaneously, multiple different wavelengths of light are emitted vertically from a single-core multi-wavelength chip, resulting in high spatial overlap of the three colors and eliminating two-dimensional and three-dimensional color differences. This leads to better color uniformity in the display, reduced costs, simplified driving processes, simpler packaging processes, and simpler control methods. This solves the problems of difficulty in improving color gamut and poor color uniformity in displays caused by two-dimensional and three-dimensional color differences.

[0053] In view of this, this application provides a backlight source that emits white light including blue, green, and red light. The backlight source includes a single-core multi-wavelength chip, and the light emitted by the single-core multi-wavelength chip includes blue light and at least one of green and red light. The single-core multi-wavelength chip can be purely electroluminescent or a combination of electroluminescence and photoluminescence.

[0054] Preferably, the single-core multi-wavelength chip combines electroluminescence and photoluminescence, comprising a first light-emitting layer and a second light-emitting layer. The first light-emitting layer is configured to provide a first light beam of electroluminescence, and the second light-emitting layer is configured to provide a second light beam of photoluminescence, the second light beam being excited by the first light beam. The first light beam contains at least one wavelength of light smaller than all wavelengths in the second light beam.

[0055] The backlight source in this application improves the color gamut by using a single-core multi-wavelength chip that emits multiple different wavelengths of light, or a single-core multi-wavelength chip that emits multiple different wavelengths of light combined with color conversion materials. This results in higher dynamic stability of the color gamut and color coordinates. Multiple different wavelengths of light are emitted vertically from a single-core multi-wavelength chip, with high spatial overlap of the three colors and no two-dimensional or three-dimensional color differences. This leads to good color uniformity in the display, reduced costs, simplified driving process, simpler packaging, and simpler control methods. Therefore, it solves the problems of difficulty in improving color gamut and poor color uniformity in displays caused by two-dimensional and three-dimensional color differences.

[0056] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0057] Figure 1 This is a schematic diagram of the structure of the light-emitting unit of the backlight source provided in the embodiment of this application. Figure 2 for Figure 1 This is one of the schematic diagrams of a single-core multi-wavelength chip for a backlight source. Figure 3 for Figure 1 The second schematic diagram shows the structure of a single-core multi-wavelength chip for the backlight source. Figure 4 for Figure 1 The third schematic diagram of the structure of the single-core multi-wavelength chip for the backlight source is shown. Figure 5 This is a schematic diagram of the structure of a backlight lamp bead for a backlight source provided in an embodiment of this application. Figure 6 This is another schematic diagram of the backlight lamp bead structure of the backlight source provided in the embodiments of this application. Figure 7 This is another schematic diagram of the backlight source provided in the embodiments of this application. Figure 8 This is one of the structural schematic diagrams of a packaging method for a light-emitting unit provided in an embodiment of this application. Figure 9 This is a second schematic diagram of a packaging method for a light-emitting unit provided in an embodiment of this application. Figure 10 This is the third schematic diagram of a packaging method for a light-emitting unit provided in an embodiment of this application.

[0058] like Figure 1 As shown, the light-emitting unit 30 in the backlight source 100 is used to emit white light including blue light, green light and red light.

[0059] In some possible implementations, white light is formed by combining blue, green and red light, with the ratio of the brightness of blue light, green light and red light ranging from 1:(5-15):(2-5).

[0060] In another possible implementation, the white light is formed by combining blue light, cyan light, green light and red light, and the ratio of the luminance of the blue light, the luminance of the cyan light, the luminance of the green light and the luminance of the red light ranges from 1:(2-5):(3-10):(2-5).

[0061] The luminance ratio is a luminance ratio required by different colors of light in the backlight, so as to meet the luminous intensity requirement of the backlight light source.

[0062] In one possible embodiment, the backlight light source 100 emits light of two different wavelengths of blue light, one wavelength of green light and two different wavelengths of red light.

[0063] In another possible embodiment, the backlight light source 100 emits light of one different wavelength of blue light, one wavelength of cyan light, two different wavelengths of green light and one different wavelength of red light.

[0064] Referring to Figure 1 , the backlight light source 100 includes a light emitting unit 30. The light emitting unit 30 includes a single-core multi-wavelength chip 10 for emitting light of multiple different wavelengths.

[0065] Specifically, the light emitted by the single-core multi-wavelength chip 10 includes blue light and at least one of green light and red light.

[0066] In some possible implementations, the light emitted by the single-core multi-wavelength chip 10 includes blue light and green light, or the light emitted by the single-core multi-wavelength chip 10 includes blue light and red light, or the light emitted by the single-core multi-wavelength chip 10 includes blue light, green light and red light.

[0067] In some possible implementations, the single-core multi-wavelength chip 10 provides blue light with a wavelength greater than or equal to 400 nm and less than 480 nm, cyan light with a wavelength greater than or equal to 480 nm and less than 510 nm, green light with a wavelength greater than or equal to 510 nm and less than 565 nm, and red light with a wavelength greater than or equal to 565 nm and less than or equal to 700 nm.

[0068] In some possible implementations, the light emitting wavelength of the single-core multi-wavelength chip 10 includes a of different wavelengths of blue light, b of different wavelengths of green light and c of different wavelengths of red light, where a≥1, b≥1 and c≥1.

[0069] The ratio of the luminance of the blue light, the luminance of the green light and the luminance of the red light emitted by the single-core multi-wavelength chip 10 ranges from 1:(5-15):(2-5).

[0070] The single-chip multi-wavelength chip 10 emits blue light of one wavelength, green light of two different wavelengths, and red light of one wavelength.

[0071] In some possible implementations, the single-chip multi-wavelength chip 10 emits blue light of a wavelengths, green light of b wavelengths, and red light of c wavelengths, where a ≥ 1, b ≥ 1, and c ≥ 1.

[0072] The single-chip multi-wavelength chip 10 emits blue light of one wavelength, green light of two different wavelengths, and red light of one wavelength.

[0073] The single-chip multi-wavelength chip 10 emits blue light of one wavelength, green light of two different wavelengths, and red light of one wavelength.

[0074] In some possible implementations, the single-chip multi-wavelength chip 10 emits blue light of a wavelengths, green light of b wavelengths, and red light of c wavelengths, where a ≥ 1, b ≥ 1, and c ≥ 1.

[0075] The single-chip multi-wavelength chip 10 emits blue light of one wavelength, green light of two different wavelengths, and red light of one wavelength.

[0076] The single-chip multi-wavelength chip 10 emits blue light of one wavelength, green light of two different wavelengths, and red light of one wavelength.

[0077] In some possible implementations, the single-chip multi-wavelength chip 10 emits blue light of a wavelengths, green light of b wavelengths, and red light of c wavelengths, where a ≥ 1, b ≥ 1, and c ≥ 1.

[0078] The single-chip multi-wavelength chip 10 emits blue light of one wavelength, green light of two different wavelengths, and red light of one wavelength.

[0079] The single-chip multi-wavelength chip 10 emits blue light of one wavelength, green light of two different wavelengths, and red light of one wavelength.

[0080] In some possible implementations, the single-core multi-wavelength chip 10 emits light in the following wavelengths: a different wavelengths of blue light, b different wavelengths of cyan light, c different wavelengths of green light, and m different wavelengths of red light, where a≥1, b≥1, c≥1, and m≥1.

[0081] The ratio of the brightness of blue light, cyan light, green light, and red light emitted by the aforementioned single-core multi-wavelength chip 10 is within the range of 1:(2-5):(3-10):(2-5). For example, the emission wavelength of the single-core multi-wavelength chip 10 includes one wavelength of blue light, two different wavelengths of cyan light, one wavelength of green light, and one wavelength of red light; or the emission wavelength of the single-core multi-wavelength chip 10 includes two different wavelengths of blue light, two different wavelengths of cyan light, one wavelength of green light, and one wavelength of red light.

[0082] In some possible implementations, the light-emitting unit 30 contains only a single-core multi-wavelength chip 10.

[0083] like Figure 8 As shown, in some possible implementations, the light-emitting unit 30 is packaged as a single single-core multi-wavelength chip 10, and the light-emitting wavelength of the single single-core multi-wavelength chip 10 includes at least one wavelength of blue light, at least one wavelength of green light and at least one wavelength of red light.

[0084] In some other possible implementations, the light-emitting unit 30 is packaged as a single single-core multi-wavelength chip 10, the single single-core multi-wavelength chip 10 emitting wavelengths including at least one wavelength of blue light, at least one wavelength of cyan light, at least one wavelength of green light and at least one wavelength of red light.

[0085] In some possible implementations, the light-emitting unit 30 includes a single-core multi-wavelength chip 10 and at least one color conversion material. The light-emitting unit 30 is encapsulated from a single single-core multi-wavelength chip 10 and a color conversion material 40. The color conversion material 40 is used to convert at least a portion of the light of at least one wavelength emitted by the single-core multi-wavelength chip 10 into a third ray. Different color conversion materials 40 convert the third ray into different wavelengths. The multiple wavelengths of light emitted by the single-core multi-wavelength chip 10 and the third ray converted by the color conversion material 40 are mixed to form white light.

[0086] The color conversion material 40 can be phosphor, quantum dot material, or other materials that perform color conversion.

[0087] In some possible implementations, the color conversion material 40 includes a green light conversion material, a red light conversion material, and a cyan light conversion material, the green light conversion material is configured to convert at least part of the light of at least one wavelength emitted by the single-chip multi-wavelength chip into green light of at least one wavelength, the red light conversion material is configured to convert at least part of the light of at least one wavelength emitted by the single-chip multi-wavelength chip into red light of at least one wavelength, and the cyan light conversion material is configured to convert at least part of the light of at least one wavelength emitted by the single-chip multi-wavelength chip into cyan light of at least one wavelength.

[0088] For example, the single-chip multi-wavelength chip emits blue light of three different wavelengths, the green light conversion material can be configured to convert all the blue light of the first wavelength in the single-chip multi-wavelength chip into green light of one wavelength, and / or convert part of the blue light of the second wavelength and the third wavelength into green light of one wavelength; for another example, the single-chip multi-wavelength chip emits blue light of one wavelength and green light of one wavelength, the green light conversion material can be configured to convert all the blue light in the single-chip multi-wavelength chip into green light of another wavelength, or convert part of the blue light in the single-chip multi-wavelength chip into green light of another wavelength, or convert part of the green light in the single-chip multi-wavelength chip into green light of another wavelength.

[0089] For example, as shown in FIG. 1, the single-chip multi-wavelength chip 10 emits blue light of two different wavelengths and green light of one wavelength. Figure 9 In some possible implementations, the light emitting wavelengths of the single-chip multi-wavelength chip 10 include a number of blue light of different wavelengths and a number of green light of different wavelengths, and the color conversion material includes a green light conversion material and a red light conversion material, where the number of blue light of different wavelengths is greater than or equal to 1, and the number of green light of different wavelengths is greater than or equal to 1.

[0090] The ratio of the luminance of the blue light to the luminance of the green light emitted by the single-chip multi-wavelength chip 10 is in the range of 1:1-1:10. The red light conversion material converts at least part of the light of at least one wavelength (e.g., part of the blue light and part of the green light) emitted by the single-chip multi-wavelength chip 10 into red light of at least one wavelength. The obtained backlight source has a ratio of the luminance of the blue light, the luminance of the green light, and the luminance of the red light in the range of 1:(5-15):(2-5).

[0091] For example, the light emitting wavelengths of the single-chip multi-wavelength chip 10 include blue light of one wavelength and green light of two different wavelengths; or the light emitting wavelengths of the single-chip multi-wavelength chip 10 include blue light of two different wavelengths and green light of one wavelength.

[0092] For example, as shown in FIG. 1, the single-chip multi-wavelength chip 10 emits blue light of two different wavelengths and green light of one wavelength. Figure 10 In some possible implementations, the light emitting wavelengths of the single-chip multi-wavelength chip 10 include a number of blue light of different wavelengths and a number of green light of different wavelengths, and the color conversion material includes a green light conversion material and a red light conversion material, where the number of blue light of different wavelengths is greater than or equal to 1, and the number of green light of different wavelengths is greater than or equal to 1.

[0093] The ratio of the intensity of the blue light to the intensity of the green light emitted by the single-core multi-wavelength chip 10 is in the range of 1:1-1:10. The green light conversion material converts at least part of the light (e.g., part of the blue light) of at least one wavelength emitted by the single-core multi-wavelength chip 10 into green light of at least one wavelength, and the red light conversion material converts the light (e.g., part of the blue light and part of the green light) of at least one wavelength emitted by the single-core multi-wavelength chip 10 into red light of at least one wavelength. The obtained backlight source has a ratio of the intensity of the blue light, the intensity of the green light, and the intensity of the red light in the range of 1:(5-15):(2-5).

[0094] The light-emitting wavelength of the single-core multi-wavelength chip 10 includes 1 wavelength of blue light, 2 different wavelengths of green light; or the light-emitting wavelength of the single-core multi-wavelength chip 10 includes 2 different wavelengths of blue light, 1 wavelength of green light. In some possible implementations, the single-core multi-wavelength chip 10 is purely electroluminescent.

[0095] In some possible implementations, the single-core multi-wavelength chip 10 is purely electroluminescent.

[0096] In some possible implementations, the single-core multi-wavelength chip 10 is purely electroluminescent.

[0097] In some possible implementations, the single-core multi-wavelength chip 10 is purely electroluminescent. Figure 2 As shown in FIG. 1, in some possible implementations, the single-core multi-wavelength chip 10 includes a p-type semiconductor layer 11 and an n-type semiconductor layer 12, and a first light-emitting layer 13 and a second light-emitting layer 14 are stacked between the p-type semiconductor layer 11 and the n-type semiconductor layer 12, and the first light-emitting layer 13 is located on the side of the second light-emitting layer 14 close to the p-type semiconductor layer 11.

[0098] The first light-emitting layer 13 generates the first light in an electroluminescent manner, and the holes in the p-type semiconductor layer 11 and the electrons in the n-type semiconductor layer 12 reach the first light-emitting layer 13, and recombination causes electroluminescence, emitting the first light. The first light excites the second light-emitting layer 14, and the second light-emitting layer 14 generates the second light in a photoluminescent manner.

[0099] The second light-emitting layer 14 generating photoluminescence is built between the p-type semiconductor layer 11 and the n-type semiconductor layer 12, the second light-emitting layer 14 releases stress in advance, so that the EQE (‌external quantum efficiency) of the first light-emitting layer 13 is improved, higher than that of the traditional chip; the second light-emitting layer 14 itself has good crystal quality, and the light is converted by multiple reflection and absorption between PN, higher than that of the traditional chip, therefore, the wavelength of the photoluminescence mechanism and the wavelength of the electroluminescence mechanism of the single-core multi-wavelength chip 10 are both higher than that of the traditional LED.

[0100] In some possible implementations, the thickness of the first light-emitting layer 13 is greater than the hole diffusion length output by the p-type semiconductor layer 11, so as to ensure that the holes generated by the p-type semiconductor layer 11 cannot reach the second light-emitting layer 14 away from the p-type semiconductor layer 11, so that the second light-emitting layer 14 is photoluminescence.

[0101] As shown in Figure 3 In some possible implementations, the single-core multi-wavelength chip 10 further includes an isolation layer 15. The isolation layer 15 is arranged between the first light-emitting layer 13 and the second light-emitting layer 14.

[0102] The sum of the thickness of the isolation layer 15 and the thickness of the first light-emitting layer 13 is greater than the hole diffusion length output by the p-type semiconductor layer 11, so as to ensure that the holes generated by the p-type semiconductor layer 11 cannot reach the second light-emitting layer 14 away from the p-type semiconductor layer 11, so that the second light-emitting layer 14 is photoluminescence.

[0103] As shown in Figure 4 In some possible implementations, the first light-emitting layer 13 includes at least one first sub-layer 131, and the second light-emitting layer 14 includes at least one second sub-layer 141, the at least one first sub-layer 131 is stacked in sequence, and the at least one second sub-layer 141 is stacked in sequence.

[0104] The first light generated by each first sub-layer 131 has a different wavelength, and the second light generated by each second sub-layer 141 has a different wavelength.

[0105] The isolation layer 15 is arranged between adjacent first sub-layers 131 and second sub-layers 141.

[0106] In some possible implementations, the sum of the thickness of the isolation layer 15 and the thickness of all the first sub-layers 131 is greater than the hole diffusion length output by the p-type semiconductor layer 11.

[0107] Further, the single-core multi-wavelength chip 10 can further include a plurality of isolation layers 15, the isolation layers 15 are arranged between the first light-emitting layer 13 and the second light-emitting layer 14, and between two and / or multiple second light-emitting layer sub-layers 141.

[0108] In some possible implementations, the isolation layer 15 comprises a silicon-doped GaN material.

[0109] In some possible implementations, the backlight light source 100 comprises a plurality of backlight beads 20.

[0110] The backlight bead 20 is formed by a light emitting unit 30. The light emitting unit 30 comprises a single-chip multi-wavelength chip 10 or a single-chip multi-wavelength chip 10 and a color conversion material. The backlight bead 20 can be formed by a single light emitting unit 30; the backlight bead 20 can also be formed by a plurality of identical light emitting units 30; the backlight bead 20 can also be formed by a plurality of different light emitting units 30; the backlight bead 20 can also be formed by a plurality of identical light emitting units 30 and some different light emitting units 30.

[0111] As shown in FIG. 1, the backlight bead 20 is formed by a single light emitting unit 30. Figure 5

[0112] As shown in FIG. 2, the backlight bead 20 is formed by two different light emitting units 30. As shown in FIG. 3, in some possible implementations, the backlight light source 100 is a surface light source, and the surface light source is formed by a plurality of light emitting units 30; the light emitting unit 30 comprises a single-chip multi-wavelength chip 10 or a single-chip multi-wavelength chip 10 and a color conversion material 40. Figure 6 Figure 7 In the light emitting unit 30, the single-chip multi-wavelength chip 10 can be different single-chip multi-wavelength chips 10. The light emission of the different single-chip multi-wavelength chips 10 is different, thereby forming different light emitting units 30.

[0113] The surface light source can be formed by a plurality of identical light emitting units 30; can also be formed by a plurality of different light emitting units 30; can also be formed by a plurality of identical light emitting units 30 and another plurality of identical light emitting units 30; can also be formed by a plurality of identical light emitting units 30 and some different light emitting units 30.

[0114] Since the three colors generated in the backlight light source 100 are white light at the chip end of the light emitting unit 30, the white light is a whole at any angle and any position, while the multi-chip technology is white light synthesized in the horizontal direction, and color differentiation occurs at a specific position and angle, resulting in uneven color of the display. Therefore, the three colors of the backlight light source 100 are highly spatially overlapped, without two-dimensional and three-dimensional color difference, so that the display has good color uniformity.

[0115] The single-chip multi-wavelength chip 10 with double-wavelength or multi-wavelength is used in combination with the packaging process, so that a backlight with a wide color gamut can be obtained, thereby improving the color gamut of the display device.

[0116] The single-chip multi-wavelength chip 10 with double-wavelength or multi-wavelength is used in combination with the packaging process, so that a backlight with a wide color gamut can be obtained, thereby improving the color gamut of the display device.

[0117] ​​When the single-core multi-wavelength chip 10 has green light or red light, because the green light and red light have narrower spectral half-width than the phosphor, and narrower than the half-width of the conventional green / red chip in the prior art, i.e., the green light and red light have narrow spectrum, compared with the wide spectrum green phosphor, or the conventional green chip and red chip, the color gamut of the backlight can be improved by at least two levels, or at least 20%.

[0118] When the single-core multi-wavelength chip 10 emits light including blue light, green light and red light, compared with the conventional blue chip + green quantum dot material or green phosphor + red quantum dot material or red phosphor, the cost is low; compared with the conventional blue chip + green chip + red chip, the cost is low.

[0119] When the single-core multi-wavelength chip 10 emits light including blue light, green light and red light, compared with the conventional blue chip + green quantum dot material or green phosphor + red quantum dot material or red phosphor, the cost is low; compared with the conventional blue chip + green chip + red chip, the cost is low.

[0120] Therefore, using the single-core multi-wavelength chip 10 can reduce the cost, replace the green light conversion material and the red light conversion material, or replace the conventional green chip and the red chip.

[0121] And, compared with the conventional multi-chip solution, using the single-core multi-wavelength chip 10 does not need to increase additional chips, and the number of driving chips is reduced, so the driving is simple.

[0122] Using the single-core multi-wavelength chip 10 also simplifies the packaging process due to the reduction or replacement of the color conversion material.

[0123] Because the multiple different wavelengths in the single-core multi-wavelength chip 10 can accurately adjust the peak wavelength and the half-width, and the intensity ratio of different wavelengths can be accurately adjusted, suitable solutions and wavelengths can be selected according to different color gamut standards and color gamut requirements, so as to improve the quality of the backlight.

[0124] In the BT2020 ratio, the range of the backlight light source 100 is greater than 100%; and / or in the BT2020 coverage, the range of the backlight light source 100 is greater than 90%.

[0125] In some possible implementations, the backlight light source 100 is a direct type.

[0126] In another possible implementation, the backlight light source 100 is a side-in type or a mini backlight.

[0127] In some possible implementations, the backlight light source 100 adopts a COB packaging process.

[0128] In some possible implementations, the backlight 100 adopts an SMD or IMD packaging process.

[0129] In a first possible embodiment, the backlight 100 includes a single-chip multi-wavelength chip 10, and different wavelength lights of the single-chip multi-wavelength chip 10 are mixed to form white light. The light-emitting wavelengths of the single-chip multi-wavelength chip 10 include a number of different wavelengths of blue light, a number of different wavelengths of green light, and a number of different wavelengths of red light. Here, a≥1, b≥1, and c≥1.

[0130] The ratio of the luminance of the blue light, the luminance of the green light, and the luminance of the red light emitted by the single-chip multi-wavelength chip 10 ranges from 1:(5-15):(2-5).

[0131] In a second possible embodiment, the backlight 100 includes a single-chip multi-wavelength chip 10, and different wavelength lights of the single-chip multi-wavelength chip 10 are mixed to form white light. The light-emitting wavelengths of the single-chip multi-wavelength chip 10 include a number of different wavelengths of blue light, a number of different wavelengths of cyan light, a number of different wavelengths of green light, and a number of different wavelengths of red light. Here, a≥1, b≥1, c≥1, and m≥1.

[0132] The ratio of the luminance of the blue light, the luminance of the cyan light, the luminance of the green light, and the luminance of the red light emitted by the single-chip multi-wavelength chip 10 ranges from 1:(2-5):(3-10):(2-5).

[0133] In a third possible embodiment, the backlight 100 includes a single-chip multi-wavelength chip 10 and a red light conversion material, and different wavelength lights of the single-chip multi-wavelength chip 10 and at least one wavelength of red light converted by the red light conversion material are mixed to form white light. The light-emitting wavelengths of the single-chip multi-wavelength chip 10 include a number of different wavelengths of blue light and a number of different wavelengths of green light. Here, a≥1 and b≥1.

[0134] The ratio of the luminance of the blue light, the luminance of the green light, and the luminance of the red light in the backlight 100 ranges from 1:(5-15):(2-5).

[0135] In a fourth possible embodiment, the backlight 100 includes a single-chip multi-wavelength chip 10 and a red light conversion material, and different wavelength lights of the single-chip multi-wavelength chip 10 and at least one wavelength of red light converted by the red light conversion material are mixed to form white light. The light-emitting wavelengths of the single-chip multi-wavelength chip 10 include a number of different wavelengths of blue light, a number of different wavelengths of cyan light, and a number of different wavelengths of green light. Here, a≥1, b≥1, and c≥1.

[0136] The ratio of the luminance of the blue light, the luminance of the cyan light, the luminance of the green light, and the luminance of the red light in the backlight 100 ranges from 1:(2-5):(3-10):(2-5).

[0137] In the fifth possible embodiment, the backlight 100 comprises a single-chip multi-wavelength chip 10 and green light conversion material, and the white light is formed by mixing the different wavelength light of the single-chip multi-wavelength chip 10 and the green light converted by the green light conversion material. The light emitting wavelength of the single-chip multi-wavelength chip 10 comprises a number of different wavelength blue light and a number of different wavelength red light. Wherein, a≥1, b≥1.

[0138] The ratio of the brightness of the blue light, the brightness of the green light and the brightness of the red light in the backlight 100 ranges from 1:(5-15):(2-5).

[0139] In the sixth possible embodiment, the backlight 100 comprises a single-chip multi-wavelength chip 10, green light conversion material and red light conversion material, and the white light is formed by mixing the different wavelength light of the single-chip multi-wavelength chip 10, the green light converted by the green light conversion material and the red light converted by the red light conversion material. The light emitting wavelength of the single-chip multi-wavelength chip 10 comprises a number of different wavelength blue light and a number of different wavelength red light. Wherein, a≥1, b≥1.

[0140] The ratio of the brightness of the blue light, the brightness of the green light and the brightness of the red light in the backlight 100 ranges from 1:(5-15):(2-5).

[0141] In the seventh possible embodiment, the backlight 100 comprises a single-chip multi-wavelength chip 10, green light conversion material and red light conversion material, and the white light is formed by mixing the different wavelength light of the single-chip multi-wavelength chip 10, the green light converted by the green light conversion material and the red light converted by the red light conversion material. The light emitting wavelength of the single-chip multi-wavelength chip 10 comprises a number of different wavelength blue light and a number of different wavelength green light. Wherein, a≥1, b≥1.

[0142] The ratio of the brightness of the blue light, the brightness of the green light and the brightness of the red light in the backlight 100 ranges from 1:(5-15):(2-5).

[0143] In the eighth possible embodiment, the backlight 100 comprises a single-chip multi-wavelength chip 10, green light conversion material and red light conversion material, and the white light is formed by mixing the different wavelength light of the single-chip multi-wavelength chip 10, the green light converted by the green light conversion material and the red light converted by the red light conversion material. The light emitting wavelength of the single-chip multi-wavelength chip 10 comprises a number of different wavelength blue light, a number of different wavelength cyan light and a number of different wavelength green light. Wherein, a≥1, b≥1, c≥1.

[0144] The ratio of the brightness of the blue light, the brightness of the cyan light, the brightness of the green light and the brightness of the red light in the backlight 100 ranges from 1:(2-5):(3-10):(2-5).

[0145] In the ninth possible embodiment, the backlight 100 comprises a single-chip multi-wavelength chip 10 and green light conversion material, and the white light is formed by mixing the different wavelength light of the single-chip multi-wavelength chip 10 and the green light converted by the green light conversion material. The light emitting wavelength of the single-chip multi-wavelength chip 10 comprises a number of different wavelength blue light, a number of different wavelength cyan light, and a number of different wavelength red light. Wherein, a≥1, b≥1, c≥1.

[0146] The ratio of the luminance of the blue light, the luminance of the cyan light, the luminance of the green light, and the luminance of the red light in the backlight 100 ranges from 1:(2-5):(3-10):(2-5).

[0147] In the tenth possible embodiment, the backlight 100 comprises a single-chip multi-wavelength chip 10, green light conversion material, and red light conversion material, and the white light is formed by mixing the different wavelength light of the single-chip multi-wavelength chip 10, the green light converted by the green light conversion material, and the red light converted by the red light conversion material. The light emitting wavelength of the single-chip multi-wavelength chip 10 comprises a number of different wavelength blue light, a number of different wavelength cyan light, and a number of different wavelength red light. Wherein, a≥1, b≥1, c≥1.

[0148] The ratio of the luminance of the blue light, the luminance of the cyan light, the luminance of the green light, and the luminance of the red light in the backlight 100 ranges from 1:(2-5):(3-10):(2-5).

[0149] In the eleventh possible embodiment, the backlight 100 comprises a single-chip multi-wavelength chip 10 and green light conversion material, and the white light is formed by mixing the different wavelength light of the single-chip multi-wavelength chip 10 and the green light converted by the green light conversion material. The light emitting wavelength of the single-chip multi-wavelength chip 10 comprises a number of different wavelength blue light, a number of different wavelength green light, and a number of different wavelength red light. Wherein, a≥1, b≥1, c≥1.

[0150] The ratio of the luminance of the blue light, the luminance of the green light, and the luminance of the red light in the backlight 100 ranges from 1:(5-15):(2-5).

[0151] In the twelfth possible embodiment, the backlight 100 comprises a single-chip multi-wavelength chip 10, green light conversion material, and red light conversion material, and the white light is formed by mixing the different wavelength light of the single-chip multi-wavelength chip 10, the green light converted by the green light conversion material, and the red light converted by the red light conversion material. The light emitting wavelength of the single-chip multi-wavelength chip 10 comprises a number of different wavelength blue light, a number of different wavelength green light, and a number of different wavelength red light. Wherein, a≥1, b≥1, c≥1.

[0152] The ratio of the brightness of the blue light, the brightness of the green light and the brightness of the red light in the backlight light source 100 is in the range of 1:(5-15):(2-5).

[0153] In a thirteenth possible embodiment, the backlight light source 100 comprises a single-core multi-wavelength chip 10 and green light conversion material, and the white light is formed by mixing the different wavelength light of the single-core multi-wavelength chip 10 and the green light converted by the green light conversion material. The light emitting wavelength of the single-core multi-wavelength chip 10 comprises a plurality of different wavelength blue light, a plurality of different wavelength cyan light, a plurality of different wavelength green light and a plurality of different wavelength red light. Wherein, a≥1, b≥1, c≥1, m≥1.

[0154] The ratio of the brightness of the blue light, the brightness of the cyan light, the brightness of the green light and the brightness of the red light in the backlight light source 100 is in the range of 1:(2-5):(3-10):(2-5).

[0155] In a fourteenth possible embodiment, the backlight light source 100 comprises a single-core multi-wavelength chip 10, green light conversion material and red light conversion material, and the white light is formed by mixing the different wavelength light of the single-core multi-wavelength chip 10, the green light converted by the green light conversion material and the red light converted by the red light conversion material. The light emitting wavelength of the single-core multi-wavelength chip 10 comprises a plurality of different wavelength blue light, a plurality of different wavelength cyan light, a plurality of different wavelength green light and a plurality of different wavelength red light. Wherein, a≥1, b≥1, c≥1, m≥1.

[0156] The ratio of the brightness of the blue light, the brightness of the cyan light, the brightness of the green light and the brightness of the red light in the backlight light source 100 is in the range of 1:(2-5):(3-10):(2-5).

[0157] The backlight light source 100 provided by the present application emits white light comprising blue light, green light and red light, and the backlight light source 100 comprises a single-core multi-wavelength chip 10, the single-core multi-wavelength chip 10 emits at least two different wavelength light, the light emitted by the single-core multi-wavelength chip contains blue light, and contains at least one of green light and red light.

[0158] By emitting a plurality of different wavelength light in the backlight light source 100 through the single-core multi-wavelength chip 10, the backlight color gamut is improved, and the color gamut and the color coordinate have higher dynamic stability. The plurality of different wavelength light is emitted from the single-core multi-wavelength chip 10, the three colors are highly spatially overlapped, there is no two-dimensional and three-dimensional color difference, and the display color uniformity is good. The color gamut and the color coordinate have higher dynamic stability, which can reduce the cost, simplify the driving mode, simplify the packaging process and control method.

[0159] The single-core multi-wavelength chip can be pure electroluminescence, or can be a combination of electroluminescence and photoluminescence, preferably, a single-core multi-wavelength chip using a combination of electroluminescence and photoluminescence, which has first light of electroluminescence and second light of photoluminescence, and the spectrum is stable and does not change with current, and the EQE is higher than that of a conventional single-core single-wavelength electroluminescence chip.

[0160] In addition, the embodiment of the present application further provides a display device comprising the backlight source.

[0161] The display device provided by the present application has higher dynamic stability of the color gamut and color coordinates by emitting multiple different wavelength lights from the single-core multi-wavelength chip 10 in the backlight source 100, the multiple different wavelength lights are emitted from the single-core multi-wavelength chip 10, the three colors are highly spatially overlapped, there is no two-dimensional and three-dimensional color difference, the display color uniformity is good, the cost is reduced, the driving is simplified, the packaging process is simple, and the control method is simple.

[0162] Finally, it should be noted that: 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 foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A backlight light source characterized by, The backlight source comprises a light emitting unit, the light emitting unit emits white light comprising blue light, green light and red light, the light emitting unit comprises a single-core multi-wavelength chip, the single-core multi-wavelength chip is a combination of electroluminescence and photoluminescence, comprising a p-type semiconductor layer, an n-type semiconductor layer, a first light emitting layer and a second light emitting layer, the first light emitting layer and the second light emitting layer are stacked between the p-type semiconductor layer and the n-type semiconductor layer, and the first light emitting layer is located on the side of the second light emitting layer close to the p-type semiconductor layer; wherein the first light emitting layer generates first light in an electroluminescence manner, the second light emitting layer generates second light in a photoluminescence manner, and the second light is obtained by exciting the first light; The single-core multi-wavelength chip emits at least two different wavelengths of light, the light emitted by the single-core multi-wavelength chip contains blue light and at least one of green light and red light; When the light emitted by the single-core multi-wavelength chip contains blue light and green light, the ratio of the brightness of the blue light to the brightness of the green light emitted by the single-core multi-wavelength chip ranges from 1:1 to 1:15; When the light emitted by the single-core multi-wavelength chip contains blue light and red light, the ratio of the brightness of the blue light to the brightness of the red light emitted by the single-core multi-wavelength chip ranges from 1:1 to 1:

5.

2. The backlight of claim 1, wherein, The backlight source also emits cyan light.

3. The backlight of claim 1, wherein, The light emitting unit comprises one single-core multi-wavelength chip, and the different wavelengths of light emitted by the single-core multi-wavelength chip are mixed to form the white light.

4. The backlight of claim 3, wherein, The light emitted by the single-core multi-wavelength chip contains at least one wavelength of blue light, at least one wavelength of green light and at least one wavelength of red light.

5. The backlight of claim 1, wherein, The light emitting unit comprises a single-core multi-wavelength chip and at least one color conversion material, the color conversion material is configured to convert at least part of the at least one wavelength of light emitted by the single-core multi-wavelength chip into third light, different color conversion materials convert the third light of different wavelengths, and the white light is formed by mixing the multiple wavelengths of light emitted by the single-core multi-wavelength chip and the third light converted by the color conversion material.

6. The backlight of claim 5, wherein, The color conversion material comprises fluorescent powder or quantum dot material.

7. The backlight of claim 5, wherein, The color conversion material comprises green light conversion material, red light conversion material and / or cyan light conversion material, the green light conversion material is configured to convert at least part of the at least one wavelength of light emitted by the single-core multi-wavelength chip into at least one wavelength of green light, the red light conversion material is configured to convert at least part of the at least one wavelength of light emitted by the single-core multi-wavelength chip into at least one wavelength of red light, and the cyan light conversion material is configured to convert at least part of the at least one wavelength of light emitted by the single-core multi-wavelength chip into at least one wavelength of cyan light.

8. The backlight of claim 5, wherein, The light emitting wavelength of the single-core multi-wavelength chip comprises a plurality of different wavelengths of blue light and a plurality of different wavelengths of green light, and the color conversion material comprises red light conversion material, wherein a≥1 and b≥1.

9. The backlight of claim 5, wherein, The light emitting wavelength of the single-core multi-wavelength chip comprises a plurality of different wavelengths of blue light and a plurality of different wavelengths of green light, and the color conversion material comprises green light conversion material and red light conversion material, wherein a≥1 and b≥1.

10. The backlight of claim 5, wherein, The light-emitting wavelength of the single-core multi-wavelength chip includes a number of different wavelengths of blue light and b number of different wavelengths of red light, and the color conversion material includes green light conversion material, wherein a≥1 and b≥1.

11. The backlight of claim 5, wherein, The light-emitting wavelength of the single-core multi-wavelength chip includes a number of different wavelengths of blue light and b number of different wavelengths of red light, and the color conversion material includes green light conversion material and red light conversion material, wherein a≥1 and b≥1.

12. The backlight of claim 5, wherein, The light-emitting wavelength of the single-core multi-wavelength chip includes a number of different wavelengths of blue light, b number of different wavelengths of green light, and c number of different wavelengths of red light, and the color conversion material includes green light conversion material, wherein a≥1, b≥1, and c≥1.

13. The backlight of claim 5, wherein, The light-emitting wavelength of the single-core multi-wavelength chip includes a number of different wavelengths of blue light, b number of different wavelengths of green light, and c number of different wavelengths of red light, and the color conversion material includes green light conversion material and red light conversion material, wherein a≥1, b≥1, and c≥1.

14. The backlight of claim 1, wherein, The backlight light source is composed of backlight beads, and the backlight beads are formed by a single light-emitting unit; and / or The backlight beads are formed by a plurality of the same light-emitting units; and / or The backlight beads are formed by different light-emitting units. The light-emitting unit includes a single single-core multi-wavelength chip or a single-core multi-wavelength chip and color conversion material.

15. The backlight of claim 1, wherein, The backlight light source is a surface light source, and the surface light source is formed by a plurality of the same or at least partially different light-emitting units; the light-emitting unit includes a single single-core multi-wavelength chip or a single-core multi-wavelength chip and color conversion material.

16. The backlight of claim 1, wherein, The light-emitting wavelength of the single-core multi-wavelength chip includes a number of different wavelengths of blue light, b number of different wavelengths of green light, and c number of different wavelengths of red light, and the ratio of the brightness of the blue light, the brightness of the green light, and the brightness of the red light emitted by the single-core multi-wavelength chip ranges from 1:(1-5):(1-10).

17. The backlight of claim 1, wherein, The light-emitting wavelength of the single-core multi-wavelength chip includes a number of different wavelengths of blue light, b number of different wavelengths of green light, and c number of different wavelengths of red light, and the ratio of the brightness of the blue light, the brightness of the green light, and the brightness of the red light emitted by the single-core multi-wavelength chip ranges from 1:(2-5):(1-5).

18. The backlight of claim 1, wherein, The light-emitting wavelength of the single-core multi-wavelength chip includes a number of different wavelengths of blue light, b number of different wavelengths of green light, and c number of different wavelengths of red light, and the ratio of the brightness of the blue light, the brightness of the green light, and the brightness of the red light emitted by the single-core multi-wavelength chip ranges from 1:(5-15):(2-5).

19. The backlight of claim 1, wherein, The light-emitting wavelength of the single-core multi-wavelength chip includes a number of different wavelengths of blue light, b number of different wavelengths of green light, and c number of different wavelengths of red light, and the ratio of the brightness of the blue light, the brightness of the green light, and the brightness of the red light emitted by the single-core multi-wavelength chip ranges from 1:(2-5):(3-10):(2-5).

20. The backlight of claim 1, wherein, The white light is formed by the combination of blue light, green light, and red light, and the ratio of the brightness of the blue light, the brightness of the green light, and the brightness of the red light in the backlight light source ranges from 1:(5-15):(2-5).

21. The backlight of claim 1, wherein, The white light is formed by compounding blue light, cyan light, green light and red light, and the ratio of the luminance of the blue light, the luminance of the cyan light, the luminance of the green light and the luminance of the red light in the backlight source ranges from 1:(2-5):(3-10):(2-5).

22. A display device, characterized by A backlight source comprising the backlight source according to any one of claims 1-21.

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