Backlight source and display equipment

Abstract

The invention relates to the technical field of display, in particular to a backlight source and display equipment. The backlight source comprises a light-emitting unit, the light-emitting unit emits white light including blue light, green light and red light, the light-emitting unit comprises a single single-core multi-wavelength chip, the single-core multi-wavelength chip emits light of at least two wavelengths, and the light emitted by the single-core multi-wavelength chip comprises the blue light and at least one of the green light and the red light. A single single-core multi-wavelength chip or a combination of the single single-core multi-wavelength chip and a color conversion material is used in a backlight light source, so that the backlight color gamut can be improved, the color gamut and color coordinates have higher dynamic stability, three-color height space overlapping is achieved, two-dimensional and three-dimensional color difference does not exist, the color uniformity of a display is good, the cost is reduced, driving is simplified, and the display quality is improved. The packaging process is simple, and the control method is simple.

Description

Technical Field

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

[0002] 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.

[0003] In the prior art, the backlight 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 has two-dimensional and three-dimensional color differences due to the multi-chip setting, which easily leads to poor color uniformity of the display. In addition, the dual-chip or multi-chip solution also has the problems of complex driving mode, complex packaging process, uneven control, and high cost. Summary of the invention

[0004] Based on this, the present application provides a backlight source and a display device to solve the problem of difficulty in improving the color gamut and poor color uniformity of the display due to two-dimensional and three-dimensional color differences.

[0005] On the one hand, the present application provides a backlight source, the backlight source 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 single-core multi-wavelength chip, the single-core multi-wavelength chip emits at least two different wavelengths of light, the light emitted by the single-core multi-wavelength chip includes blue light, and includes at least one of green light and red light;

[0006] When the light emitted by the single-core multi-wavelength chip includes blue light and green light, the ratio of the brightness of the blue light emitted by the single-core multi-wavelength chip to the brightness of the green light is in the range of 1:1-1:15;

[0007] When the light emitted by the single-core multi-wavelength chip includes blue light and red light, the ratio of the brightness of the blue light emitted by the single-core multi-wavelength chip to the brightness of the red light is in the range of 1:(1-5).

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

[0009] In some possible implementations, the backlight source also emits cyan light.

[0010] In some possible implementations, the light-emitting unit includes a single-core multi-wavelength chip, and a plurality of different wavelength lights of the single-core multi-wavelength chip are mixed to form the white light.

[0011] In some possible implementations, the light emitted by the single-core multi-wavelength chip includes 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 includes 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 at least one wavelength of light emitted by the single-core multi-wavelength chip into a third light, the third light converted by different color conversion materials has different wavelengths, and the multiple wavelengths of light emitted by the single-core multi-wavelength chip and the third light converted by the color conversion material are mixed to form the white light.

[0013] In some possible implementations, the color conversion material includes phosphor or quantum dot material.

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

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

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

[0017] In some possible implementations, the backlight 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 identical light-emitting units; and / or

[0019] The backlight lamp beads are formed by different light-emitting units;

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

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

[0022] In some possible implementations, the light-emitting wavelengths of the single-core multi-wavelength chip include a different wavelengths of blue light, b different wavelengths of cyan light, and c different wavelengths of green light. 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-core multi-wavelength chip is in the range of 1:(1-5):(1-10).

[0023] In some possible implementations, the light-emitting wavelengths of the single-core multi-wavelength chip include a different wavelengths of blue light, b different wavelengths of cyan light, and c different wavelengths of red light. The ratio of the brightness of the blue light, the brightness of the cyan light, and the brightness of the red light emitted by the single-core multi-wavelength chip is in the range of 1:(2-5):(1-5).

[0024] In some possible implementations, the light-emitting wavelengths of the single-core multi-wavelength chip include a different wavelengths of blue light, b different wavelengths of green light, and c different wavelengths of red light. 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 is in the range of 1:(5-15):(2-5).

[0025] In some possible implementations, the light-emitting wavelengths of a single-core multi-wavelength chip include 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. 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 emitted by the single-core multi-wavelength chip is in the range of 1:(2-5):(3-10):(2-5).

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

[0027] In some possible implementations, white light is formed by combining blue light, cyan light, green light and red light, and the ratio of the brightness of blue light, cyan light, green light and red light in the backlight source is in the range of 1:(2-5):(3-10):(2-5).

[0028] On the other hand, the present application provides a display device, comprising the above-mentioned backlight source.

[0029] The backlight source and display device provided by the present application. 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 a color conversion material, the color gamut is improved, and 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, and the three colors are highly spatially overlapped, without two-dimensional and three-dimensional color differences, so that the color uniformity of the display is good, the cost is reduced, the driving is simplified, the packaging process is simple, and the control method is simple. This solves the problem of difficulty in improving the color gamut and the problem of poor color uniformity of the display due to two-dimensional and three-dimensional color differences.

[0030] When there is green light wavelength or red light in the single-core multi-wavelength chip, since its green light and red light are narrower than the half-peak width of the spectrum of the phosphor, and narrower than the half-peak width of the traditional green light / red light chip in the prior art, that is, it is narrow-spectrum green light and red light, compared with wide-spectrum green light phosphor, or traditional green light chip and red light chip, 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 wavelength and green light wavelength, the cost is lower than the traditional blue light chip + green quantum dot material or green phosphor; the cost is lower than the traditional blue light chip + green light chip. When the single-core multi-wavelength chip emits light including blue light wavelength, green light wavelength and red light wavelength, the cost is lower than the traditional blue light chip + green quantum dot material or green phosphor + red quantum dot material or red phosphor; the cost is lower than the traditional blue light chip + green light chip + red light chip. Therefore, the use of a single-core multi-wavelength chip can reduce costs, replace green light conversion materials and red light conversion materials, or replace traditional green light chips and red light chips. Moreover, compared with the traditional multi-chip solution, the use of a single-core multi-wavelength chip does not require the addition of additional chips, reducing the number of driver chips, so the drive is simple and the control method is simple. The use of a single-core multi-wavelength chip also simplifies the packaging process by reducing or replacing color conversion materials.

[0031] Preferably, when the single-core multi-wavelength chip used is a combination of electroluminescence and photoluminescence, it includes a first light-emitting layer and a second light-emitting layer. The first light-emitting layer generates a first light in an electroluminescent manner. The holes in the p-type semiconductor layer and the electrons in the n-type semiconductor layer reach the first light-emitting layer, and the recombination causes electroluminescence, emitting the first light. The first light excites the second light-emitting layer, thereby generating a second light in a photoluminescent manner. The second light-emitting layer that generates photoluminescence is built between the p-type semiconductor layer and the n-type semiconductor layer. The second light-emitting layer releases stress in advance, so that the EQE of the first light-emitting layer is improved, which is higher than the EQE of the traditional chip; the second light-emitting layer itself has good crystal quality, and multiple reflections and absorption light conversions between PN are performed, which is higher than the EQE 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 that combines electroluminescence and photoluminescence are both higher than the EQE of the traditional LED. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A schematic diagram of the structure of a light-emitting unit of a backlight source provided in an embodiment of the present application;

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

[0035] Figure 3 for Figure 1 The second structural schematic diagram of the single-core multi-wavelength chip of the backlight source shown;

[0036] Figure 4 for Figure 1 The third structural schematic diagram of the single-core multi-wavelength chip of the backlight source shown;

[0037] Figure 5 A schematic diagram of the structure of a backlight lamp bead of a backlight light source provided in an embodiment of the present application;

[0038] Figure 6 Another schematic diagram of the structure of a backlight lamp bead of a backlight source provided in an embodiment of the present application;

[0039] Figure 7 A schematic diagram of another structure of a backlight source provided in an embodiment of the present application;

[0040] Figure 8 One of the structural schematic diagrams of a packaging method of a light-emitting unit provided in an embodiment of the present application;

[0041] Fig. 9 A second structural diagram of a packaging method of a light-emitting unit provided in an embodiment of the present application;

[0042] Fig.10 The third structural schematic diagram of a packaging method of the light-emitting unit provided in an embodiment of the present application.

[0043] Description of reference numerals:

[0044] 100-backlight source; 10-single-core multi-wavelength chip; 11-p-type semiconductor layer; 12-n-type semiconductor layer; 13-first light-emitting layer; 131-first layer; 14-second light-emitting layer; 141-second layer; 15-isolation layer; 20-backlight lamp beads; 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 embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

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

[0049] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or 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 the prior art, the backlight of LCD display devices mainly includes: a solution using a single-wavelength chip plus phosphor, which has limited color gamut improvement; a solution using dual chips or multiple chips plus phosphor, which has two-dimensional and three-dimensional color differences due to the multi-chip setting, easily leading to poor color uniformity of the display, and has complex driving methods, complex packaging processes, uneven control, and high costs; a solution using multiple chips also has two-dimensional and three-dimensional color differences, easily leading to poor color uniformity of the display, and has complex driving methods, complex packaging processes, uneven control, and high costs.

[0052] After repeated thinking and verification, the inventor found that if the light-emitting unit in the backlight includes a single single-core multi-wavelength chip, the color gamut will be greatly improved, and the color gamut and color coordinates have higher dynamic stability. At the same time, multiple different wavelengths of light are emitted from the vertical direction of a single-core multi-wavelength chip, and the three colors overlap highly in space, without two-dimensional and three-dimensional color difference, so that the color uniformity of the display is good, the cost is reduced, the driving is simplified, the packaging process is simple, and the control method is simple. This solves the problem of difficulty in improving the color gamut and the problem of poor color uniformity of the display due to two-dimensional and three-dimensional color difference.

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

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

[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, and 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, and the three colors are highly overlapped in space, without two-dimensional and three-dimensional color difference, so that the color uniformity of the display is good, the cost is reduced, the driving is simplified, the packaging process is simple, and the control method is simple. This solves the problem of difficulty in improving the color gamut and the problem of poor color uniformity of the display due to two-dimensional and three-dimensional color difference.

[0056] The contents of the present application will be described in detail below in conjunction with the accompanying drawings so that those skilled in the art can understand the contents of the present application more clearly and in detail.

[0057] Figure 1 A schematic diagram of the structure of a light-emitting unit of a backlight source provided in an embodiment of the present application. Figure 2 for Figure 1 One of the structural schematic diagrams of the single-core multi-wavelength chip of the backlight light source shown. Figure 3 for Figure 1 The second structural schematic diagram of the single-core multi-wavelength chip of the backlight source shown. Figure 4 for Figure 1 The third structural schematic diagram of the single-core multi-wavelength chip of the backlight source shown. Figure 5 A schematic diagram of the structure of a backlight lamp bead of a backlight light source provided in an embodiment of the present application. Figure 6 Another schematic diagram of the structure of a backlight lamp bead of a backlight light source provided in an embodiment of the present application. Figure 7 A schematic diagram of another structure of the backlight source provided in the embodiment of the present application. Figure 8 This is one of the structural schematic diagrams of a packaging method of a light-emitting unit provided in an embodiment of the present application. Fig. 9 The second structural schematic diagram of a packaging method of the light-emitting unit provided in an embodiment of the present application. Fig.10 The third structural schematic diagram of a packaging method of the light-emitting unit provided in an embodiment of the present 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 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 is in the range of 1:(5-15):(2-5).

[0060] In some other possible implementations, white light is formed by combining blue light, cyan light, green light and red light, and the ratio of the brightness of blue light, the brightness of cyan light, the brightness of green light and the brightness of red light is in the range of 1:(2-5):(3-10):(2-5).

[0061] The above brightness ratio is the brightness ratio that different colors of light need to meet in the backlight, so as to meet the requirements of the backlight light source on the luminous brightness.

[0062] In a possible embodiment, the light emission wavelengths of the backlight source 100 include 2 blue lights of different wavelengths, 1 green light of different wavelengths, and 2 red lights of different wavelengths.

[0063] In another possible embodiment, the light emission wavelengths of the backlight source 100 include 1 blue light of different wavelength, 1 cyan light of different wavelength, 2 green lights of different wavelengths and 1 red light of different wavelength.

[0064] See also Figure 1 The backlight source 100 includes a light emitting unit 30. The light emitting unit 30 includes a single single-core multi-wavelength chip 10, and the single-core multi-wavelength chip 10 is used to emit a plurality of different wavelengths of light.

[0065] Specifically, the light emitted by the single-core multi-wavelength chip 10 includes blue light, and also includes 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 wavelength of blue light provided by the single-core multi-wavelength chip 10 is greater than or equal to 400nm and less than 480nm, the wavelength of cyan light is greater than or equal to 480nm and less than 510nm, the wavelength of green light is greater than or equal to 510nm and less than 565nm, and the wavelength of red light is greater than or equal to 565nm and less than or equal to 700nm.

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

[0069] 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 10 is in the range of 1:(5-15):(2-5).

[0070] For example, the light emission wavelengths of the single-core multi-wavelength chip 10 include 1 wavelength of blue light, 2 different wavelengths of green light and 1 wavelength of red light; or the light emission wavelengths of the single-core multi-wavelength chip 10 include 2 different wavelengths of blue light, 2 different wavelengths of green light and 1 wavelength of red light.

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

[0072] 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-core multi-wavelength chip 10 is in the range of 1:(1-5):(1-10).

[0073] For example, the light emission wavelengths of the single-core multi-wavelength chip 10 include 1 wavelength of blue light, 2 different wavelengths of cyan light and 1 wavelength of green light; or the light emission wavelengths of the single-core multi-wavelength chip 10 include 2 different wavelengths of blue light, 2 different wavelengths of cyan light and 1 wavelength of green light.

[0074] In some possible implementations, the light emission wavelengths of the single-core multi-wavelength chip 10 include a blue light of different wavelengths and b red light of different wavelengths, where a≥1 and b≥1.

[0075] The ratio of the brightness of the blue light and the brightness of the red light emitted by the single-core multi-wavelength chip 10 is in the range of 1:(1-5).

[0076] For example, the light emission wavelength of the single-core multi-wavelength chip 10 includes 1 wavelength of blue light and 2 different wavelengths of red light; or the light emission wavelength of the single-core multi-wavelength chip 10 includes 2 different wavelengths of blue light and 1 wavelength of red light.

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

[0078] The ratio of the brightness of the blue light, the brightness of the cyan light and the brightness of the red light emitted by the single-core multi-wavelength chip 10 is in the range of 1:(2-5):(1-5).

[0079] For example, the light emission wavelengths of the single-core multi-wavelength chip 10 include 1 wavelength of blue light, 2 different wavelengths of cyan light and 1 wavelength of red light; or the light emission wavelengths of the single-core multi-wavelength chip 10 include 2 different wavelengths of blue light, 2 different wavelengths of cyan light and 1 wavelength of red light.

[0080] In some possible implementations, the light emission wavelengths of the single-core multi-wavelength chip 10 include 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 the blue light, the brightness of the cyan light, the brightness of the green light and the brightness of the red light emitted by the single-core multi-wavelength chip 10 is in the range of 1:(2-5):(3-10):(2-5). For example, the emission wavelengths of the single-core multi-wavelength chip 10 include 1 wavelength of blue light, 2 different wavelengths of cyan light, 1 wavelength of green light and 1 wavelength of red light; or the emission wavelengths of the single-core multi-wavelength chip 10 include 2 different wavelengths of blue light, 2 different wavelengths of cyan light, 1 wavelength of green light and 1 wavelength of red light.

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

[0083] like Figure 8 As shown, in some possible implementations, the light-emitting unit 30 is packaged by 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 by a single single-core multi-wavelength chip 10, and the light-emitting wavelengths of the single single-core multi-wavelength chip 10 include 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 packaged by 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 part of at least one wavelength of light emitted by the single-core multi-wavelength chip 10 into a third light. The wavelengths of the third lights converted by different color conversion materials 40 are different. The multiple wavelengths of light emitted by the single-core multi-wavelength chip 10 and the third lights converted by the color conversion material 40 are mixed to form white light.

[0086] The color conversion material 40 may be made of fluorescent powder, quantum dot material or other color conversion materials.

[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 used to convert at least a portion of at least one wavelength of light emitted by a single-core multi-wavelength chip into at least one wavelength of green light; the red light conversion material is used to convert at least a portion of at least one wavelength of light emitted by a single-core multi-wavelength chip into at least one wavelength of red light; and the cyan light conversion material is used to convert at least a portion of at least one wavelength of light emitted by a single-core multi-wavelength chip into at least one wavelength of cyan light.

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

[0089] like Fig. 9 As shown, in some possible implementations, the light emission wavelengths of the single-core multi-wavelength chip 10 include a blue light of different wavelengths and b green light of different wavelengths, and the color conversion material includes a red light conversion material, wherein a≥1 and b≥1.

[0090] The ratio of the brightness of the blue light emitted by the single-core multi-wavelength chip 10 to the brightness of the green light is in the range of 1:1-1:10. The red light conversion material converts at least part of the light (such as 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 ratio of the brightness of the blue light, the brightness of the green light, and the brightness of the red light of the backlight source obtained is in the range of 1:(5-15):(2-5).

[0091] For example, the light emission wavelength of the single-core multi-wavelength chip 10 includes 1 wavelength of blue light and 2 different wavelengths of green light; or the light emission wavelength of the single-core multi-wavelength chip 10 includes 2 different wavelengths of blue light and 1 wavelength of green light.

[0092] like Fig.10 As shown, in some possible implementations, the light emission wavelengths of the single-core multi-wavelength chip 10 include a blue light of different wavelengths and b green light of different wavelengths, and the color conversion material includes a green light conversion material and a red light conversion material, wherein a≥1, b≥1.

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

[0094] For example, the emission wavelength of the single-core multi-wavelength chip 10 includes 1 wavelength of blue light and 2 different wavelengths of green light; or the emission wavelength of the single-core multi-wavelength chip 10 includes 2 different wavelengths of blue light and 1 wavelength of green light. In some possible implementations, the single-core multi-wavelength chip 10 is pure electroluminescence.

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

[0096] In some other possible implementations, the single-core multi-wavelength chip 10 is a combination of electroluminescence and photoluminescence. It includes a first light-emitting layer and a second light-emitting layer, the first light-emitting layer is configured to provide a first light of electroluminescence, and the second light-emitting layer is configured to provide a second light of photoluminescence, and the second light is excited by the first light. There is at least one wavelength of light in the first light, which is smaller than all wavelengths of light in the second light. Optionally, the first light may include one or more of blue light, cyan light, and green light, and the second light may include one or more of blue light, cyan light, green light, and red.

[0097] Preferably, the single-core multi-wavelength chip 10 uses a combination of electroluminescence and photoluminescence. Figure 2 As shown, 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 stacked first light-emitting layer 13 and a second light-emitting layer 14 are provided between the p-type semiconductor layer 11 and the n-type semiconductor layer 12, and the first light-emitting layer 13 is located on a 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 recombine to cause electroluminescence, thereby emitting the first light. The first light excites the second light emitting layer 14, thereby generating the second light in a photoluminescent manner.

[0099] The second light-emitting layer 14 that generates 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, which is higher than the EQE of the traditional chip; the second light-emitting layer 14 itself has good crystal quality and multiple reflection and absorption light conversions between PN, which is higher than the EQE 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 the EQE 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 to ensure that the holes generated by the p-type semiconductor layer 11 cannot reach the second light-emitting layer 14 far away from the p-type semiconductor layer 11, so that the second light-emitting layer 14 is photoluminescent.

[0101] like Figure 3 As shown, in some possible implementations, the single-core multi-wavelength chip 10 further includes an isolation layer 15. The isolation layer 15 is disposed 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 far away from the p-type semiconductor layer 11, so that the second light-emitting layer 14 is photoluminescent.

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

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

[0105] The isolation layer 15 is disposed between the adjacent first layers 131 and second layers 141 .

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

[0107] Furthermore, the single-core multi-wavelength chip 10 may further include a plurality of isolation layers 15 , wherein the isolation layers 15 are disposed between the first light-emitting layer 13 and the second light-emitting layer 14 , and between two and / or a plurality of second light-emitting layer layers 141 .

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

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

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

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

[0112] like Figure 6 As shown, the backlight lamp bead 20 is formed by two different light-emitting units 30. Figure 7 As shown, in some possible implementations, the backlight source 100 is a surface light source, which is formed by a plurality of light-emitting units 30 ; the light-emitting unit 30 includes a single single-core multi-wavelength chip 10 or a single single-core multi-wavelength chip 10 and a color conversion material 40 .

[0113] In the light-emitting unit 30 , a single single-core multi-wavelength chip 10 may be different single-core multi-wavelength chips 10 . Different single-core multi-wavelength chips 10 emit different light, thus forming different light-emitting units 30 .

[0114] The surface light source can be formed by multiple identical light-emitting units 30; it can also be formed by multiple different light-emitting units 30; it can also be formed by multiple identical light-emitting units 30 and other identical light-emitting units 30; it can also be formed by multiple identical light-emitting units 30 and some different light-emitting units 30.

[0115] Since the three colors generated in the backlight light source 100 are white light at the chip end of the light-emitting unit 30, they are white light as a whole at any angle and any position. However, the multi-chip technology synthesizes white light in the horizontal direction. At specific positions and angles, color differentiation will occur, 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 differences, so that the color uniformity of the display is good.

[0116] By using a dual-wavelength or multi-wavelength single-core multi-wavelength chip 10 in combination with a packaging process, a backlight with a wide color gamut can be obtained, thereby improving the color gamut of the display device.

[0117] When there is a green wavelength or red light in the single-core multi-wavelength chip 10, since the green and red lights are narrower than the half-peak width of the spectrum of the phosphor, and narrower than the half-peak width of the traditional green / red chips in the prior art, that is, they are narrow-spectrum green and red lights, compared with wide-spectrum green phosphors, or traditional green and red chips, 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 wavelengths and green light wavelengths, the cost is lower than that of a traditional blue light chip + green quantum dot material or green phosphor; the cost is lower than that of a traditional blue light chip + green light chip.

[0119] When the single-core multi-wavelength chip 10 emits light including blue light wavelengths, green light wavelengths and red light wavelengths, the cost is lower than that of the traditional blue light chip + green quantum dot material or green phosphor + red quantum dot material or red phosphor; the cost is lower than that of the traditional blue light chip + green light chip + red light chip.

[0120] Therefore, using the single-core multi-wavelength chip 10 can reduce costs, replace green light conversion materials and red light conversion materials, or replace traditional green light chips and red light chips.

[0121] Furthermore, compared with the traditional multi-chip solution, the use of the single-core multi-wavelength chip 10 does not require the addition of additional chips, thus reducing the number of driving chips, and thus making driving simpler.

[0122] The use of the single-core multi-wavelength chip 10 also simplifies the packaging process by reducing or replacing the color conversion material.

[0123] Since the multiple different wavelengths in the single-core multi-wavelength chip 10 can accurately adjust the peak wavelength and half-peak width, and the light intensity ratio of different wavelengths can be accurately adjusted, it is possible to select appropriate solutions and wavelengths according to different color gamut standards and color gamut requirements, thereby improving the quality of the backlight.

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

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

[0126] In some other possible implementations, the backlight source 100 is an edge-type or mini backlight.

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

[0128] In some other possible implementations, the backlight source 100 adopts SMD or IMD packaging technology.

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

[0130] 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 10 is in the range of 1:(5-15):(2-5).

[0131] In a second possible embodiment, the backlight source 100 includes a single-core multi-wavelength chip 10, and the different wavelengths of light of the single-core multi-wavelength chip 10 are mixed to form white light. The light emission wavelengths of the single-core multi-wavelength chip 10 include 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. Wherein, a≥1, b≥1, c≥1, and m≥1.

[0132] 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 emitted by the single-core multi-wavelength chip 10 is in the range of 1:(2-5):(3-10):(2-5).

[0133] In a third possible embodiment, the backlight source 100 includes a single-core multi-wavelength chip 10 and a red light conversion material, and the different wavelengths of light of the single-core 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 emission wavelengths of the single-core multi-wavelength chip 10 include a different wavelengths of blue light and b different wavelengths of green light. Wherein, a≥1, b≥1.

[0134] 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 100 is in the range of 1:(5-15):(2-5).

[0135] In a fourth possible embodiment, the backlight source 100 includes a single-core multi-wavelength chip 10 and a red light conversion material, and the different wavelengths of light of the single-core 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 emission wavelengths of the single-core multi-wavelength chip 10 include a different wavelengths of blue light, b different wavelengths of cyan light, and c different wavelengths of green light. Wherein, a≥1, b≥1, c≥1.

[0136] 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 source 100 is in the range of 1:(2-5):(3-10):(2-5).

[0137] In a fifth possible embodiment, the backlight source 100 includes a single-core multi-wavelength chip 10 and a green light conversion material, and the different wavelengths of light of the single-core multi-wavelength chip 10 and at least one wavelength of green light converted by the green light conversion material are mixed to form white light. The emission wavelengths of the single-core multi-wavelength chip 10 include a different wavelengths of blue light and b different wavelengths of 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 source 100 is in the range of 1:(5-15):(2-5).

[0139] In a sixth possible embodiment, the backlight source 100 includes a single-core multi-wavelength chip 10, a green light conversion material, and a red light conversion material. The different wavelengths of light from the single-core multi-wavelength chip 10, at least one wavelength of green light converted by the green light conversion material, and at least one wavelength of red light converted by the red light conversion material are mixed to form white light. The light emission wavelengths of the single-core multi-wavelength chip 10 include a different wavelengths of blue light and b different wavelengths of 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 source 100 is in the range of 1:(5-15):(2-5).

[0141] In a seventh possible embodiment, the backlight source 100 includes a single-core multi-wavelength chip 10, a green light conversion material, and a red light conversion material. The different wavelengths of light from the single-core multi-wavelength chip 10, at least one wavelength of green light converted by the green light conversion material, and at least one wavelength of red light converted by the red light conversion material are mixed to form white light. The light emission wavelengths of the single-core multi-wavelength chip 10 include a different wavelengths of blue light and b different wavelengths of 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 source 100 is in the range of 1:(5-15):(2-5).

[0143] In an eighth possible embodiment, the backlight source 100 includes a single-core multi-wavelength chip 10, a green light conversion material, and a red light conversion material. The different wavelengths of light of the single-core multi-wavelength chip 10, the green light of at least one wavelength converted by the green light conversion material, and the red light of at least one wavelength converted by the red light conversion material are mixed to form white light. The emission wavelengths of the single-core multi-wavelength chip 10 include a different wavelengths of blue light, b different wavelengths of cyan light, and c different wavelengths of 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 source 100 is in the range of 1:(2-5):(3-10):(2-5).

[0145] In a ninth possible embodiment, the backlight source 100 includes a single-core multi-wavelength chip 10 and a green light conversion material, and the different wavelengths of light of the single-core multi-wavelength chip 10 and at least one wavelength of green light converted by the green light conversion material are mixed to form white light. The emission wavelengths of the single-core multi-wavelength chip 10 include a different wavelengths of blue light, b different wavelengths of cyan light, and c different wavelengths of red light. Wherein, a≥1, b≥1, and c≥1.

[0146] 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 source 100 is in the range of 1:(2-5):(3-10):(2-5).

[0147] In a tenth possible embodiment, the backlight source 100 includes a single-core multi-wavelength chip 10, a green light conversion material, and a red light conversion material. The different wavelengths of light of the single-core multi-wavelength chip 10, the green light of at least one wavelength converted by the green light conversion material, and the red light of at least one wavelength converted by the red light conversion material are mixed to form white light. The emission wavelengths of the single-core multi-wavelength chip 10 include a different wavelengths of blue light, b different wavelengths of cyan light, and c different wavelengths of red light. Wherein, a≥1, b≥1, c≥1.

[0148] 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 source 100 is in the range of 1:(2-5):(3-10):(2-5).

[0149] In an eleventh possible embodiment, the backlight source 100 includes a single-core multi-wavelength chip 10 and a green light conversion material, and the different wavelengths of light from the single-core multi-wavelength chip 10 and at least one wavelength of green light converted by the green light conversion material are mixed to form white light. The light emission wavelengths of the single-core multi-wavelength chip 10 include a different wavelengths of blue light, b different wavelengths of green light, and c different wavelengths of red light. Wherein, a≥1, b≥1, and c≥1.

[0150] 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 100 is in the range of 1:(5-15):(2-5).

[0151] In a twelfth possible embodiment, the backlight source 100 includes a single-core multi-wavelength chip 10, a green light conversion material, and a red light conversion material. The different wavelengths of light from the single-core multi-wavelength chip 10, at least one wavelength of green light converted by the green light conversion material, and at least one wavelength of red light converted by the red light conversion material are mixed to form white light. The light emission wavelengths of the single-core multi-wavelength chip 10 include a different wavelengths of blue light, b different wavelengths of green light, and c different wavelengths of 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 source 100 is in the range of 1:(5-15):(2-5).

[0153] In a thirteenth possible embodiment, the backlight source 100 includes a single-core multi-wavelength chip 10 and a green light conversion material, and the different wavelengths of light of the single-core multi-wavelength chip 10 and at least one wavelength of green light converted by the green light conversion material are mixed to form white light. The emission wavelengths of the single-core multi-wavelength chip 10 include 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. Wherein, a≥1, b≥1, c≥1, and 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 source 100 is in the range of 1:(2-5):(3-10):(2-5).

[0155] In the fourteenth possible embodiment, the backlight source 100 includes a single-core multi-wavelength chip 10, a green light conversion material, and a red light conversion material. The different wavelengths of light from the single-core multi-wavelength chip 10, at least one wavelength of green light converted by the green light conversion material, and at least one wavelength of red light converted by the red light conversion material are mixed to form white light. The light emission wavelengths of the single-core multi-wavelength chip 10 include 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. Wherein, a≥1, b≥1, c≥1, and 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 source 100 is in the range of 1:(2-5):(3-10):(2-5).

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

[0158] By using the single-core multi-wavelength chip 10 to emit multiple different wavelengths of light in the backlight light source 100, the backlight color gamut is improved, and the color gamut and color coordinates have higher dynamic stability. Multiple different wavelengths of light are emitted from the single-core multi-wavelength chip 10, and the three colors overlap highly in space, without two-dimensional and three-dimensional color difference, so that the display color uniformity is good. The color gamut and color coordinates have higher dynamic stability, which can reduce costs, simplify the driving method, simplify the packaging process, and simplify the control method.

[0159] The single-core multi-wavelength chip can be pure electroluminescence or a combination of electroluminescence and photoluminescence. Preferably, a single-core multi-wavelength chip combining electroluminescence and photoluminescence is used, which has a first electroluminescent light and a second photoluminescent light, and a stable spectrum that does not change with current. At the same time, the EQE is higher than that of a traditional single-core single-wavelength electroluminescent chip.

[0160] In addition, an embodiment of the present application also provides a display device, including the above-mentioned backlight source.

[0161] The display device provided by the present application emits multiple lights of different wavelengths in the backlight light source 100 through a single-core multi-wavelength chip 10, and the color gamut and color coordinates have higher dynamic stability. Multiple lights of different wavelengths are emitted from the single-core multi-wavelength chip 10, and the three colors highly overlap in space, without two-dimensional and three-dimensional color differences, so that the display has good color uniformity, reduces costs, simplifies driving, has a simple packaging process, and a simple control method.

[0162] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A backlight source, characterized in that: The backlight source 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 single-core multi-wavelength chip, the single-core multi-wavelength chip emits at least two different wavelengths of light, and the light emitted by the single-core multi-wavelength chip includes blue light and includes at least one of green light and red light; When the light emitted by the single-core multi-wavelength chip includes blue light and green light, the ratio of the brightness of the blue light emitted by the single-core multi-wavelength chip to the brightness of the green light is in a range of 1:1-1:15; When the light emitted by the single-core multi-wavelength chip includes blue light and red light, the ratio of the brightness of the blue light emitted by the single-core multi-wavelength chip to the brightness of the red light is in the range of 1:(1-5).

2. The backlight source according to claim 1, characterized in that: The single-core multi-wavelength chip is pure electroluminescence or a combination of electroluminescence and photoluminescence.

3. The backlight source according to claim 1, characterized in that: The backlight source also emits cyan light.

4. The backlight source according to claim 1, characterized in that: The light emitting unit includes one of the single-core multi-wavelength chips, and a plurality of different wavelength lights of the single-core multi-wavelength chip are mixed to form the white light.

5. The backlight source according to claim 4, characterized in that: The light emitted by the single-core multi-wavelength chip includes at least one wavelength of blue light, at least one wavelength of green light and at least one wavelength of red light.

6. The backlight source according to claim 1, characterized in that: The light-emitting unit includes a single-core multi-wavelength and at least one color conversion material. The color conversion material is configured to convert at least part of at least one wavelength of light emitted by the single-core multi-wavelength chip into a third light. The wavelengths of the third light converted by different color conversion materials are different. The multiple wavelengths of light emitted by the single-core multi-wavelength chip and the third light converted by the color conversion material are mixed to form the white light.

7. The backlight source according to claim 6, characterized in that: The color conversion material includes phosphor or quantum dot material.

8. The backlight source according to claim 6, characterized in that: The color conversion material includes a green light conversion material, a red light conversion material and / or a cyan light conversion material. The green light conversion material is configured to convert at least a portion of 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 a portion of 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 a portion of at least one wavelength of light emitted by the single-core multi-wavelength chip into at least one wavelength of cyan light.

9. The backlight source according to claim 6, characterized in that: The light emission wavelengths of the single-core multi-wavelength chip include a blue light of different wavelengths and b green light of different wavelengths, and the color conversion material includes a red light conversion material, wherein a≥1 and b≥1.

10. The backlight source according to claim 6, characterized in that: The light emission wavelengths of the single-core multi-wavelength chip include a blue light of different wavelengths and b green light of different wavelengths, and the color conversion material includes a green light conversion material and a red light conversion material, wherein a≥1 and b≥1.

11. The backlight source according to claim 1, characterized in that: The backlight source is composed of backlight lamp beads, and the backlight lamp beads are formed by a single light-emitting unit; and / or The backlight lamp beads are formed by a plurality of identical light-emitting units; and / or The backlight lamp beads are formed by different light-emitting units; Wherein, the light-emitting unit includes a single single-core multi-wavelength chip or a single single-core multi-wavelength chip and a color conversion material.

12. The backlight source according to claim 1, characterized in that: The backlight source is a surface light source, which is formed by a plurality of identical or at least partially different light-emitting units; the light-emitting unit includes a single single-core multi-wavelength chip or a single single-core multi-wavelength chip and a color conversion material.

13. The backlight source according to claim 1, characterized in that: The light-emitting wavelengths of the single-core multi-wavelength chip include a different wavelengths of blue light, b different wavelengths of cyan light, and c different wavelengths of green light. 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-core multi-wavelength chip is in the range of 1:(1-5):(1-10).

14. The backlight source according to claim 1, characterized in that: The light-emitting wavelengths of the single-core multi-wavelength chip include a different wavelengths of blue light, b different wavelengths of cyan light, and c different wavelengths of red light. The ratio of the brightness of the blue light, the brightness of the cyan light, and the brightness of the red light emitted by the single-core multi-wavelength chip is in the range of 1:(2-5):(1-5).

15. The backlight source according to claim 1, characterized in that: The light emission wavelengths of the single-core multi-wavelength chip include a different wavelengths of blue light, b different wavelengths of green light and c different wavelengths of red light. 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 is in the range of 1:(5-15):(2-5).

16. The backlight source according to claim 1, characterized in that: The light-emitting wavelengths of the single-core multi-wavelength chip include 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. 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 emitted by the single-core multi-wavelength chip is in the range of 1:(2-5):(3-10):(2-5).

17. The backlight source according to claim 1, characterized in that: The white light is formed by combining 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 is in the range of 1:(5-15):(2-5).

18. The backlight source according to claim 1, characterized in that: The white light is formed by combining blue light, cyan light, green light and red light. 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 source is in the range of 1:(2-5):(3-10):(2-5).

19. A display device, characterized in that: Comprising a backlight source as described in any one of claims 1-18.

Images