Backlight source and display device

Abstract

A backlight source and a display device. The backlight source is configured to provide blue light at m different wavelengths, green light at n different wavelengths and red light at l different wavelengths, where m≥1, n≥1, l≥1, m+n≥2 and m+n+l≥4.

Description

Backlight and display device

[0001] The present application claims priority to the Chinese patent application No. 202411150584.0, filed on August 20, 2024, to the Chinese Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of display technology, for example, to a backlight and a display device. BACKGROUND

[0003] The color gamut of a display device is very important, and the larger the color gamut is, the more colors can be reproduced. The color gamut of a liquid crystal display (LCD) display device is mainly related to the backlight, and also related to the filter layer of the liquid crystal panel.

[0004] The existing technologies for improving the color gamut of an LCD display device mainly include: 1. improving the backlight, by changing the type of light-emitting diode (LED) fluorescent powder or using quantum dot materials to improve the color gamut of the backlight, and the related technologies all use three primary colors, i.e., a triangular color gamut backlight, as shown in FIG. 1. This way has a small adjustable range and a small color gamut improvement space, by changing the type of LED fluorescent powder. Using quantum dot materials has a high cost and a short service life and poor reliability. 2. improving the liquid crystal panel, by increasing the structure of the filter layer from three colors to four colors. This way only increases the number of filter layers and sub-pixels, and is limited by the traditional backlight, so that the color gamut improvement space is small. As shown by the inner circle of small quadrilaterals in FIG. 4, because the traditional backlight is still a triangular color gamut, and the half-peak width is relatively wide, even if the liquid crystal panel is a multi-primary color, but after being matched with the traditional backlight, the multi-primary color light emitted from the display device still has a small color gamut. SUMMARY

[0005] The present application provides a backlight and a display device. The backlight is a multi- polygon wide color gamut backlight, which has a large adjustable range, a large color gamut improvement space, low technical difficulty and low cost. The backlight can be matched with a multi-primary color liquid crystal panel in related technologies, and the combination of the two has a very large color gamut improvement space.

[0006] The present application provides a backlight configured to provide m different wavelengths of blue light, n different wavelengths of green light and l different wavelengths of red light, wherein m≥1, n≥1, l≥1, m+n≥2, and m+n+l≥4.

[0007] In some embodiments, the wavelength of the blue light is greater than or equal to 410 nm and less than 500 nm, the wavelength of the green light is greater than or equal to 500 nm and less than 565 nm, and the wavelength of the red light is greater than or equal to 565 nm and less than or equal to 700 nm.

[0008] In some embodiments, the backlight includes a single-chip multi-wavelength chip, and the wavelength light emitted by the single-chip multi-wavelength chip includes m different wavelengths of blue light, n different wavelengths of green light, and l different wavelengths of red light.

[0009] In some embodiments, the backlight includes a single-chip multi-wavelength chip, d green light conversion materials, and e red light conversion materials, and the wavelength light emitted by the single-chip multi-wavelength chip includes a different wavelengths of blue light, b different wavelengths of green light, and c different wavelengths of red light, where a = m, b + d = n, c + e = l, a + b + c ≥ 2, and d + e ≥ 1.

[0010] In some embodiments, the backlight includes at least two single-chip multi-wavelength chips, and the total wavelength light emitted by the at least two single-chip multi-wavelength chips includes m different wavelengths of blue light, n different wavelengths of green light, and l different wavelengths of red light.

[0011] In some embodiments, the backlight includes at least two single-chip multi-wavelength chips, d green light conversion materials, and e red light conversion materials, and the total wavelength light emitted by the at least two single-chip multi-wavelength chips includes a different wavelengths of blue light, b different wavelengths of green light, and c different wavelengths of red light, where a + b + c ≥ 4, a = m, b + d = n, c + e = l, and d + e ≥ 1.

[0012] In some embodiments, the backlight includes at least one single-chip multi-wavelength chip and at least one single-chip single-wavelength chip, the wavelength light emitted by the at least one single-chip multi-wavelength chip includes f different wavelengths of blue light, g different wavelengths of green light, and h different wavelengths of red light, and the total wavelength light emitted by the at least one single-chip single-wavelength chip includes i different wavelengths of blue light, j different wavelengths of green light, and k different wavelengths of red light, where f + g + h ≥ 2, f + i = m, g + j = n, and h + k = l.

[0013] In some embodiments, the backlight includes a plurality of single-chip single-wavelength chips, and the total wavelength light emitted by the plurality of single-chip single-wavelength chips includes m different wavelengths of blue light, n different wavelengths of green light, and l different wavelengths of red light.

[0014] In some embodiments, the backlight light source comprises at least one single-core single-wavelength chip, d kinds of green light conversion materials and e kinds of red light conversion materials, the total wavelength light emitted by the at least one single-core single-wavelength chip comprises 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, wherein a+b+c≥1, a=m, b+d=n, c+e=l, d+e≥1.

[0015] In some embodiments, the backlight light source comprises at least one single-core multi-wavelength chip, at least one single-core single-wavelength chip, d kinds of green light conversion materials and e kinds of red light conversion materials, the wavelength light emitted by the at least one single-core multi-wavelength chip comprises f number of different wavelengths of blue light, g number of different wavelengths of green light and h number of different wavelengths of red light, the total wavelength light emitted by the at least one single-core single-wavelength chip comprises i number of different wavelengths of blue light, j number of different wavelengths of green light and k number of different wavelengths of red light, wherein f+g+h≥2, i+j+k≥1, f+i=m, g+j+d=n, h+k+e=l, d+e≥1.

[0016] In some embodiments, the green light conversion material comprises a fluorescent powder or a quantum dot material; or

[0017] The red light conversion material comprises a fluorescent powder or a quantum dot material; or

[0018] The green light conversion material and the red light conversion material both comprise a fluorescent powder or a quantum dot material.

[0019] In some embodiments, the single-core multi-wavelength chip is pure electroluminescence or a combination of electroluminescence and photoluminescence.

[0020] The present application provides a display device comprising the above-mentioned backlight light source and a liquid crystal panel, the backlight light source is located under the liquid crystal panel to provide light for the liquid crystal panel. BRIEF DESCRIPTION OF DRAWINGS

[0021] FIG. 1 is a chromaticity diagram (CIE chromaticity diagram) of a triangular color gamut backlight in the related art;

[0022] FIG. 2 is a chromaticity diagram (CIE chromaticity diagram) of a backlight light source provided by an embodiment of the present application;

[0023] FIG. 3 is a chromaticity diagram (CIE chromaticity diagram) of a backlight light source provided by an embodiment of the present application;

[0024] FIG. 4 is a comparison diagram of a four-primary-color liquid crystal panel matched with a traditional backlight and a quadrilateral color gamut provided by an embodiment of the present application in the related art;

[0025] FIG. 5 is a structural schematic diagram of a display device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar notations represent the same or similar components or components with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, rather than all the embodiments. The embodiments described below with 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 of ordinary skill in the art without creative work are within the scope of protection of the present application. The embodiments of the present application will be described below with reference to the drawings.

[0027] In the description of the present application, unless explicitly defined and limited, the terms "mount", "connect", "connection" should be understood in a broad sense, for example, it can be a fixed connection, or an indirect connection through an intermediate medium, or an internal communication of two elements or an interaction relationship between two elements. For those of ordinary skill in the art, the meaning of the above terms in the present application can be understood according to the situation.

[0028] In the description of the present application, 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.

[0029] The terms "first", "second", "third" (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0030] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or display including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or displays.

[0031] After repeated thinking and verification, the inventors found that if the backlight is configured to increase the primary colors of the backlight, the color gamut of the backlight light source of the display device is changed from a three-primary color triangular color gamut to a polygonal color gamut, the color gamut of the backlight is widened, the adjustable range of the backlight is increased, and the color gamut has a large space for improvement. For example, the backlight provided in the present application can match a multi-primary color liquid crystal panel in the related art, and the combination of the two results in a very large color gamut improvement space.

[0032] Therefore, the backlight light source is configured to provide m different wavelengths of blue light, n different wavelengths of green light, and l different wavelengths of red light, where m is greater than or equal to 1, n is greater than or equal to 1, l is greater than or equal to 1, m+n is greater than or equal to 2, and m+n+l is greater than or equal to 4.

[0033] The present application increases the number of primary colors in the backlight light source by changing the primary colors provided by the backlight light source from three to at least four, thereby obtaining a polygonal wide color gamut backlight with a large adjustable range and a large color gamut improvement space.

[0034] The content of the present application will be described below with reference to the accompanying drawings to enable those skilled in the art to better understand the content of the present application.

[0035] The backlight light source provided by the embodiments of the present application is used in a display device. The backlight light source is configured to provide a polygonal wide color gamut backlight, thereby improving the color gamut of the display device.

[0036] The backlight light source increases the primary colors of the backlight from three wavelengths to at least four wavelengths in the related art, thereby obtaining a polygonal wide color gamut backlight.

[0037] The backlight light source is configured to provide m different wavelengths of blue light, n different wavelengths of green light, and l different wavelengths of red light. m is greater than or equal to 1, n is greater than or equal to 1, l is greater than or equal to 1, m+n is greater than or equal to 2, and m+n+l is greater than or equal to 4.

[0038] In some possible implementations, the wavelengths of the blue light provided by the backlight light source are greater than or equal to 410 nm and less than 500 nm, the wavelengths of the green light are greater than or equal to 500 nm and less than 565 nm, and the wavelengths of the red light are greater than or equal to 565 nm and less than or equal to 700 nm.

[0039] In some possible implementations, the backlight light source is a quadrilateral wide color gamut backlight, such as containing 1 wavelength of blue light, 2 different wavelengths of green light, and 1 wavelength of red light, or 2 different wavelengths of blue light, 1 wavelength of green light, and 1 wavelength of red light.

[0040] In some possible implementations, the backlight light source is a pentagonal wide color gamut backlight, such as containing 2 different wavelengths of blue light, 2 different wavelengths of green light, and 1 wavelength of red light, or 1 wavelength of blue light, 3 different wavelengths of green light, and 1 wavelength of red light.

[0041] In some possible implementations, the backlight light source is a hexagonal wide color gamut backlight, such as containing 2 different wavelengths of blue light, 3 different wavelengths of green light, and 1 wavelength of red light, or 2 different wavelengths of blue light, 2 different wavelengths of green light, and 2 different wavelengths of red light.

[0042] Table 1 represents the color gamut space comparison of the related art and the quadrilateral wide color gamut backlight and the pentagon wide color gamut backlight of the present application.

[0043] Table 1 represents the color gamut space comparison of the related art and the quadrilateral wide color gamut backlight and the pentagon wide color gamut backlight of the present application.

[0044] In the table, BT2020 ratio represents the color primaries and color encoding in the BT2020 standard. BT2020 coverage represents the color gamut coverage in the BT2020 standard.

[0045] Compared with the triangle color gamut of the related art three primary colors, the polygon wide color gamut backlight has at least 40% improvement in BT2020 ratio, and at least 23% improvement in BT2020 coverage.

[0046] As can be seen, the backlight light source provided by the present application has obvious improvement in BT2020 ratio and BT2020 coverage.

[0047] In some possible implementations, the backlight light source is a direct type, a side-in type or a mini backlight.

[0048] In some possible implementations, the backlight light source adopts a Chip-On-Board (COB), a Surface Mounted Devices (SMD) or an Integrated Matrix Devices (IMD) packaging process.

[0049] The backlight light source can realize the polygon wide color gamut backlight through various different packaging schemes. For example, through a full-chip scheme or a chip plus color conversion material scheme.

[0050] The color conversion material can adopt fluorescent powder or quantum dot material or other color conversion materials.

[0051] In some possible implementations, the backlight light source includes a single-core multi-wavelength chip. The single-core multi-wavelength chip contains all the primary colors in the polygon wide color gamut backlight. That is, the single-core multi-wavelength chip emits light of m different wavelengths of blue light, n different wavelengths of green light and l different wavelengths of red light.

[0052] The single-core multi-wavelength chip provides all wavelengths of light.

[0053] For example, in the quadrilateral wide color gamut backlight, the single-core multi-wavelength chip contains 1 wavelength of blue light, 2 different wavelengths of green light and 1 wavelength of red light.

[0054] As in the pentagonal wide color gamut backlight, the single-core multi-wavelength chip contains 2 different wavelengths of blue light, 2 different wavelengths of green light and 1 wavelength of red light.

[0055] As in the hexagonal wide color gamut backlight, the single-core multi-wavelength chip contains 2 different wavelengths of blue light, 3 different wavelengths of green light and 1 wavelength of red light.

[0056] In some possible implementations, the backlight light source includes one single-core multi-wavelength chip and one or more color conversion materials. The single-core multi-wavelength chip contains only part of the wavelengths of the primary colors in the polygonal wide color gamut backlight, and the light in the single-core multi-wavelength chip is converted by the color conversion material to obtain the remaining wavelengths of the primary colors in the polygonal wide color gamut backlight.

[0057] That is, the backlight light source includes one single-core multi-wavelength chip, d green light conversion materials and e red light conversion materials. The wavelengths of light emitted by 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. a=m, b+d=n, c+e=l, a+b+c≥2, d+e≥1.

[0058] One or more wavelengths in the single-core multi-wavelength chip are used to excite the color conversion material to emit the required wavelength, that is, at least one wavelength in the single-core multi-wavelength chip is smaller than the wavelength of all the color conversion materials.

[0059] As in the quadrilateral wide color gamut backlight, the single-core multi-wavelength chip contains 1 wavelength of blue light and 2 different wavelengths of green light, and 1 wavelength of red light is converted by the red light conversion material. Or, the single-core multi-wavelength chip contains 1 wavelength of blue light and 1 wavelength of green light, another wavelength of green light is converted by the green light conversion material, and 1 wavelength of red light is converted by the red light conversion material. Or, the single-core multi-wavelength chip contains 2 different wavelengths of blue light and 1 wavelength of green light, and 1 wavelength of red light is converted by the red light conversion material.

[0060] As in the pentagonal wide color gamut backlight, the single-core multi-wavelength chip contains 2 different wavelengths of blue light and 2 different wavelengths of green light, and 1 wavelength of red light is converted by the red light conversion material. Or, the single-core multi-wavelength chip contains 2 different wavelengths of blue light and 1 wavelength of green light, another wavelength of green light is converted by the green light conversion material, and 1 wavelength of red light is converted by the red light conversion material.

[0061] As in the hexagonal wide color gamut backlight, the single-core multi-wavelength chip contains 2 different wavelengths of blue light and 2 different wavelengths of green light, another wavelength of green light is converted by the green light conversion material, and 1 wavelength of red light is converted by the red light conversion material. Or, the single-core multi-wavelength chip contains 2 different wavelengths of blue light and 3 different wavelengths of green light, and 1 wavelength of red light is converted by the red light conversion material.

[0062] Optionally, the backlight light source adopts a single-core multi-wavelength chip, or a single-core multi-wavelength chip and one / multiple color conversion materials, which has low cost, simple circuit, simple control, simple packaging, and wider color gamut.

[0063] In some possible implementations, the backlight light source includes at least two single-core multi-wavelength chips. The at least two single-core multi-wavelength chips contain all primary colors in the polygonal wide color gamut backlight.

[0064] That is, the total wavelength light emitted by the at least two single-core multi-wavelength chips includes m different wavelengths of blue light, n different wavelengths of green light, and l different wavelengths of red light.

[0065] As in the quadrilateral wide color gamut backlight, one single-core multi-wavelength chip contains one wavelength of blue light and one wavelength of green light. Another single-core multi-wavelength chip contains another wavelength of blue light and one wavelength of red light. Or, one single-core multi-wavelength chip contains one wavelength of blue light and one wavelength of green light. Another single-core multi-wavelength chip contains another wavelength of green light and one wavelength of red light. Or, one single-core multi-wavelength chip contains two different wavelengths of blue light. Another single-core multi-wavelength chip contains one wavelength of green light and one wavelength of red light.

[0066] As in the pentagonal wide color gamut backlight, one single-core multi-wavelength chip contains two different wavelengths of blue light and one wavelength of green light. Another single-core multi-wavelength chip contains another wavelength of green light and one wavelength of red light. Or, one single-core multi-wavelength chip contains two different wavelengths of blue light. Another single-core multi-wavelength chip contains two different wavelengths of green light and one wavelength of red light.

[0067] As in the hexagonal wide color gamut backlight, one single-core multi-wavelength chip contains two different wavelengths of blue light and two different wavelengths of green light. Another single-core multi-wavelength chip contains another wavelength of green light and one wavelength of red light. Or, one single-core multi-wavelength chip contains one wavelength of blue light and three different wavelengths of green light. Another single-core multi-wavelength chip contains another wavelength of blue light and one wavelength of red light. Or, one single-core multi-wavelength chip contains two different wavelengths of blue light. A second single-core multi-wavelength chip contains two different wavelengths of green light. A third single-core multi-wavelength chip contains another wavelength of green light and one wavelength of red light.

[0068] In some possible implementations, the backlight light source includes at least two single-core multi-wavelength chips and one or more color conversion materials. The at least two single-core multi-wavelength chips contain part of the wavelengths of the primary colors in the polygonal wide color gamut backlight, and the light in the single-core multi-wavelength chip is converted by the color conversion material to obtain the remaining wavelengths of the primary colors in the polygonal wide color gamut backlight.

[0069] That is, the backlight includes at least two single-core multi-wavelength chips, d green light conversion materials, and e red light conversion materials. The total wavelength light emitted by the at least two single-core multi-wavelength chips 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. a+b+c≥4, a=m, b+d=n, c+e=l, d+e≥1.

[0070] One or more wavelengths in the single-core multi-wavelength chip is the excitation color conversion material to emit the required wavelength, that is, at least one wavelength in the single-core multi-wavelength chip is less than the wavelength of all color conversion materials.

[0071] As in the pentagonal wide color gamut backlight, one single-core multi-wavelength chip contains 2 different wavelengths of blue light. Another single-core multi-wavelength chip contains 2 different wavelengths of green light. One wavelength of red light is converted by the red light conversion material. Or, one single-core multi-wavelength chip contains 1 wavelength of blue light, 1 wavelength of green light. Another single-core multi-wavelength chip contains another 2 different wavelengths of green light. One wavelength of red light is converted by the red light conversion material.

[0072] As in the hexagonal wide color gamut backlight, one single-core multi-wavelength chip contains 2 different wavelengths of blue light. Another single-core multi-wavelength chip contains another wavelength of blue light, 1 wavelength of green light. Another wavelength of green light is converted by the green light conversion material, and 1 wavelength of red light is converted by the red light conversion material. Or, one single-core multi-wavelength chip contains 1 wavelength of blue light, 1 wavelength of green light. Another single-core multi-wavelength chip contains another wavelength of blue light, another 2 different wavelengths of green light. One wavelength of red light is converted by the red light conversion material.

[0073] As in the octagonal wide color gamut backlight, one single-core multi-wavelength chip contains 2 different wavelengths of blue light. The second single-core multi-wavelength chip contains 2 different wavelengths of green light. The third single-core multi-wavelength chip contains another wavelength of blue light, another wavelength of green light, and 1 wavelength of red light. Another wavelength of red light is converted by the red light conversion material.

[0074] In some possible implementations, the backlight includes at least one single-core multi-wavelength chip and at least one single-core single-wavelength chip. The at least one single-core multi-wavelength chip contains part of the primary colors of the polygonal wide color gamut backlight, and the at least one single-core single-wavelength chip contains the remaining primary colors of the polygonal wide color gamut backlight.

[0075] That is, the backlight source includes at least one single-core multi-wavelength chip and at least one single-core single-wavelength chip, the light-emitting wavelength of the at least one single-core multi-wavelength chip includes blue light of f different wavelengths, green light of g different wavelengths and red light of h different wavelengths, and the total wavelength light emitted by the at least one single-core single-wavelength chip includes blue light of i different wavelengths, green light of j different wavelengths and red light of k different wavelengths. f+g+h≥2, f+i=m, g+j=n, h+k=l.

[0076] As in the quadrilateral wide color gamut backlight, one single-core multi-wavelength chip contains blue light of 1 wavelength and green light of 1 wavelength, the first single-core single-wavelength chip contains another wavelength of blue light, and the second single-core single-wavelength chip contains red light of 1 wavelength. Or, one single-core multi-wavelength chip contains blue light of 1 wavelength and green light of 2 wavelengths, and one single-core single-wavelength chip contains red light of 1 wavelength.

[0077] As in the pentagonal wide color gamut backlight, the first single-core multi-wavelength chip contains blue light of 2 different wavelengths, the second single-core multi-wavelength chip contains green light of 2 different wavelengths, and one single-core single-wavelength chip contains red light of 1 wavelength. Or, one single-core multi-wavelength chip contains blue light of 1 wavelength and green light of 2 different wavelengths, the first single-core single-wavelength chip contains another wavelength of green light, and the second single-core single-wavelength chip contains red light of 1 wavelength.

[0078] As in the hexagonal wide color gamut backlight, the first single-core multi-wavelength chip contains blue light of 2 different wavelengths, the second single-core multi-wavelength chip contains another wavelength of blue light and green light of 1 wavelength, the first single-core single-wavelength chip contains another wavelength of green light, and the second single-core single-wavelength chip contains red light of 1 wavelength. Or, the first single-core multi-wavelength chip contains blue light of 1 wavelength and green light of 1 wavelength, the second single-core multi-wavelength chip contains another wavelength of blue light and another 2 different wavelengths of green light, and one single-core single-wavelength chip contains red light of 1 wavelength.

[0079] In some possible implementations, the backlight source includes at least one single-core multi-wavelength chip, at least one single-core single-wavelength chip, d kinds of green light conversion materials and e kinds of red light conversion materials. The at least one single-core multi-wavelength chip contains part of the wavelengths of the primary colors in the polygonal wide color gamut backlight, and the at least one single-core single-wavelength chip contains part of the wavelengths of the primary colors in the polygonal wide color gamut backlight. The light in the single-core multi-wavelength chip or the single-core single-wavelength chip is converted by the color conversion material to obtain the remaining wavelengths of the primary colors in the polygonal wide color gamut backlight.

[0080] That is, the backlight includes at least one single-core multi-wavelength chip, at least one single-core single-wavelength chip, d green light conversion materials, and e red light conversion materials. The wavelength light emitted by the at least one single-core multi-wavelength chip includes f different wavelengths of blue light, g different wavelengths of green light, and h different wavelengths of red light. The total wavelength light emitted by the at least one single-core single-wavelength chip includes i different wavelengths of blue light, j different wavelengths of green light, and k different wavelengths of red light. f+g+h≥2, i+j+k≥1, f+i=m, g+j+d=n, h+k+e=l, d+e≥1.

[0081] One or more wavelengths in the single-core multi-wavelength chip or the single-core single-wavelength chip are the excitation colors for the conversion materials to emit the desired wavelengths, that is, at least one wavelength in the single-core multi-wavelength chip or the single-core single-wavelength chip is smaller than the wavelength of all the conversion materials.

[0082] For example, in a hexagonal wide color gamut backlight, the first single-core multi-wavelength chip includes 2 different wavelengths of blue light, the second single-core multi-wavelength chip includes another wavelength of blue light and 1 wavelength of green light, the single-core single-wavelength chip includes another wavelength of green light, and 1 wavelength of red light is converted by the red light conversion material. Alternatively, the single-core multi-wavelength chip includes 1 wavelength of blue light and 1 wavelength of green light, the single-core single-wavelength chip includes another wavelength of blue light, 2 different wavelengths of green light are converted by the green light conversion material, and 1 wavelength of red light is converted by the red light conversion material.

[0083] In some possible implementations, the backlight includes a plurality of single-core single-wavelength chips. The plurality of single-core single-wavelength chips includes all the primary colors in a polygonal wide color gamut backlight.

[0084] That is, the total wavelength light emitted by the plurality of single-core single-wavelength chips includes m different wavelengths of blue light, n different wavelengths of green light, and l different wavelengths of red light.

[0085] For example, in a quadrilateral wide color gamut backlight, the first single-core single-wavelength chip includes 1 wavelength of blue light, the second single-core single-wavelength chip includes another wavelength of blue light, the third single-core single-wavelength chip includes 1 wavelength of green light, and the fourth single-core single-wavelength chip includes 1 wavelength of red light. Alternatively, the first single-core single-wavelength chip includes 1 wavelength of blue light, the second single-core single-wavelength chip includes 1 wavelength of green light, the third single-core single-wavelength chip includes another wavelength of green light, and the fourth single-core single-wavelength chip includes 1 wavelength of red light.

[0086] As in the pentagon wide color gamut backlight, the first single-core single-wavelength chip contains 1 wavelength of blue light, the second single-core single-wavelength chip contains another wavelength of blue light, the third single-core single-wavelength chip contains 1 wavelength of green light, the fourth single-core single-wavelength chip contains another wavelength of green light, and the fifth single-core single-wavelength chip contains 1 wavelength of red light. Or the first single-core single-wavelength chip contains 1 wavelength of blue light, the second single-core single-wavelength chip contains another wavelength of blue light, the third single-core single-wavelength chip contains a third wavelength of blue light, the fourth single-core single-wavelength chip contains 1 wavelength of green light, and the fifth single-core single-wavelength chip contains 1 wavelength of red light.

[0087] As in the hexagon wide color gamut backlight, the first single-core single-wavelength chip contains 1 wavelength of blue light, the second single-core single-wavelength chip contains another wavelength of blue light, the third single-core single-wavelength chip contains 1 wavelength of green light, the fourth single-core single-wavelength chip contains another wavelength of green light, the fifth single-core single-wavelength chip contains 1 wavelength of red light, and the sixth single-core single-wavelength chip contains another wavelength of red light. Or the first single-core single-wavelength chip contains 1 wavelength of blue light, the second single-core single-wavelength chip contains another wavelength of blue light, the third single-core single-wavelength chip contains 1 wavelength of green light, the fourth single-core single-wavelength chip contains another wavelength of green light, the fifth single-core single-wavelength chip contains a third wavelength of green light, and the sixth single-core single-wavelength chip contains 1 wavelength of red light.

[0088] In some possible implementations, the backlight light source includes at least one single-core single-wavelength chip and one or more color conversion materials. The at least one single-core single-wavelength chip contains part of the wavelengths of the primary colors in the polygon wide color gamut backlight, and the light in the single-core single-wavelength chip is converted by the color conversion material to obtain the remaining wavelengths of the primary colors in the polygon wide color gamut backlight.

[0089] That is, the backlight light source includes at least one single-core single-wavelength chip, d green light conversion materials, and e red light conversion materials, and the total wavelength light emitted by the at least one single-core single-wavelength chip includes a number of different wavelengths of blue light, b different wavelengths of green light, and c different wavelengths of red light. a+b+c≥1, a=m, b+d=n, c+e=l, d+e≥1.

[0090] One or more wavelengths in the single-core single-wavelength chip are the excitation wavelengths required for the color conversion material to emit, that is, at least one wavelength in the single-core single-wavelength chip is less than the wavelength of all color conversion materials.

[0091] As in a quadrilateral wide color gamut backlight, the first single-core single-wavelength chip contains one wavelength of blue light, the second single-core single-wavelength chip contains another wavelength of blue light, the third single-core single-wavelength chip contains one wavelength of green light, and one wavelength of red light is converted by a red light conversion material. Or the first single-core single-wavelength chip contains one wavelength of blue light, the second single-core single-wavelength chip contains one wavelength of green light, and the third single-core single-wavelength chip contains another wavelength of green light, and one wavelength of red light is converted by a red light conversion material.

[0092] As in a pentagonal wide color gamut backlight, the first single-core single-wavelength chip contains one wavelength of blue light, the second single-core single-wavelength chip contains another wavelength of blue light, the third single-core single-wavelength chip contains one wavelength of green light, another wavelength of green light is converted by a green light conversion material, and one wavelength of red light is converted by a red light conversion material. Or the first single-core single-wavelength chip contains one wavelength of blue light, the second single-core single-wavelength chip contains another wavelength of blue light, the third single-core single-wavelength chip contains one wavelength of green light, the fourth single-core single-wavelength chip contains another wavelength of green light, and one wavelength of red light is converted by a red light conversion material.

[0093] As in a hexagonal wide color gamut backlight, the first single-core single-wavelength chip contains one wavelength of blue light, the second single-core single-wavelength chip contains another wavelength of blue light, the third single-core single-wavelength chip contains one wavelength of green light, the fourth single-core single-wavelength chip contains another wavelength of green light, the fifth single-core single-wavelength chip contains a third wavelength of green light, and one wavelength of red light is converted by a red light conversion material. Or the first single-core single-wavelength chip contains one wavelength of blue light, the second single-core single-wavelength chip contains another wavelength of blue light, the third single-core single-wavelength chip contains one wavelength of green light, the fourth single-core single-wavelength chip contains another wavelength of green light, the third wavelength of green light is converted by a green light conversion material, and one wavelength of red light is converted by a red light conversion material.

[0094] In some possible implementations, the green light conversion material includes a fluorescent powder or a quantum dot material; and / or the red light conversion material includes a fluorescent powder or a quantum dot material.

[0095] In some possible implementations, the single-core multi-wavelength chip is only pure electroluminescence, or a combination of electroluminescence and photoluminescence.

[0096] As shown in FIG. 2, a chromaticity diagram of a quadrilateral wide color gamut backlight source provided by an embodiment of the present application is shown.

[0097] The embodiment adopts one single-core multi-wavelength chip and one fluorescent powder material.

[0098] The single-core multi-wavelength chip includes one wavelength of blue light and two wavelengths of green light, and one wavelength of red light is converted by the phosphor material.

[0099] The wavelength of the blue light is 455 nm, and the half-width is 18 nm; the wavelength of the first green light is 500 nm, and the half-width is 25 nm; the wavelength of the second green light is 530 nm, and the half-width is 25 nm; the phosphor material is KSF powder (fluoride red phosphor), and the wavelength of the converted red light is 620 nm.

[0100] It can be seen that the quadrilateral wide color gamut backlight light source provided in the embodiment has obvious improvement in BT2020 ratio and BT2020 coverage compared with the triangular color gamut.

[0101] As shown in FIG. 3, the chromaticity diagram (CIE chromaticity diagram) of the pentagonal wide color gamut backlight light source provided in the embodiment of the present application is shown.

[0102] The embodiment adopts a single-core multi-wavelength chip and a phosphor material.

[0103] The single-core multi-wavelength chip includes two wavelengths of blue light and two wavelengths of green light, and one wavelength of red light is converted by the phosphor material.

[0104] The wavelength of the first blue light is 455 nm, and the half-width is 18 nm; the wavelength of the second blue light is 495 nm, and the half-width is 20 nm; the wavelength of the first green light is 505 nm, and the half-width is 25 nm; the wavelength of the second green light is 530 nm, and the half-width is 25 nm; the phosphor material is KSF powder, and the wavelength of the converted red light is 620 nm.

[0105] It can be seen that the quadrilateral wide color gamut backlight light source provided in the embodiment has obvious improvement in BT2020 ratio and BT2020 coverage compared with the triangular color gamut.

[0106] FIG. 4 is a comparison diagram of a quadrilateral color gamut provided in the embodiment of the present application and a traditional backlight light source matched with a four-primary-color liquid crystal panel in the related art.

[0107] The outermost quadrilateral area is the quadrilateral color gamut provided in the embodiment of the present application, and the middle quadrilateral area is the quadrilateral color gamut of the traditional backlight light source matched with the four-primary-color liquid crystal panel in the related art. It can be seen that, compared with the multi-primary-color liquid crystal panel in the related art, the quadrilateral wide color gamut backlight light source provided in the embodiment has obvious improvement in BT2020 ratio and BT2020 coverage.

[0108] The backlight light source provided in the application is configured to provide m different wavelengths of blue light, n different wavelengths of green light, and l different wavelengths of red light, wherein m is greater than or equal to 1, n is greater than or equal to 1, l is greater than or equal to 1, m+n is greater than or equal to 2, and m+n+l is greater than or equal to 4.

[0109] By changing the primary colors provided by the backlight light source from three to at least four, the number of primary colors in the backlight light source is increased, thereby obtaining a polygonal wide color gamut backlight. Compared with the existing three-primary-color backlight, the adjustable range is large, the color gamut has a large space for improvement, the reliability is good, and the service life is long. For example, the backlight provided in the application can match a multi-primary-color liquid crystal panel in the related art, and the combination of the two makes the color gamut improvement space very large.

[0110] The backlight light source provided in the application changes the primary colors provided by the backlight light source from three to at least four, that is, the backlight light source has an N-sided polygonal wide color gamut, and N is greater than or equal to 4. The number of primary colors in the backlight light source is increased, thereby obtaining a polygonal wide color gamut backlight. The adjustable range of the backlight is large, the color gamut has a large space for improvement, the technical difficulty is low, and the cost is low. In particular, the backlight provided in the application can match a multi-primary-color liquid crystal panel in the related art, and the combination of the two makes the color gamut improvement space very large. The backlight light source and the display device provided in the application upgrade the performance of display industry products and can meet the quality improvement needs of various displays. The BT2020 ratio is at least improved by 40%, and the BT2020 coverage is at least improved by 23%.

[0111] In addition, the display device provided in the embodiment of the application also includes the backlight light source and the liquid crystal panel, and the backlight light source is located below the liquid crystal panel to provide light for the liquid crystal panel.

[0112] The display device provided in the application changes the primary colors provided by the backlight light source from three to at least four, thereby increasing the number of primary colors in the backlight light source, and obtaining a polygonal wide color gamut backlight. Compared with the existing three-primary-color backlight, the adjustable range is large, the color gamut has a large space for improvement, the reliability is good, and the service life is long. For example, the backlight provided in the application can match a multi-primary-color liquid crystal panel in the related art, and the combination of the two makes the color gamut improvement space very large, thereby meeting the quality improvement needs of various displays and solving the problem of color gamut improvement difficulty.

Claims

1. A backlight light source configured to provide m different wavelengths of blue light, n different wavelengths of green light, and 1 different wavelengths of red light, wherein, m≥1, n≥1, l≥1, m+n≥2, m+n+l≥4.

2. The backlight according to claim 1, wherein, The wavelength of the blue light is greater than or equal to 410 nm and less than 500 nm, the wavelength of the green light is greater than or equal to 500 nm and less than 565 nm, and the wavelength of the red light is greater than or equal to 565 nm and less than or equal to 700 nm.

3. The backlight of claim 1, comprising a single-chip multi-wavelength chip, wherein the single-chip multi-wavelength chip emits wavelength light including m different wavelengths of blue light, n different wavelengths of green light, and l different wavelengths of red light.

4. The backlight of claim 1, comprising a single-chip multi-wavelength chip, d green light conversion materials, and e red light conversion materials, wherein the single-chip multi-wavelength chip emits wavelength light including a different wavelengths of blue light, b different wavelengths of green light, and c different wavelengths of red light, and a = m, b + d = n, c + e = l, a + b + c ≥ 2, and d + e ≥ 1.

5. The backlight of claim 1, comprising at least two single-chip multi-wavelength chips, wherein the at least two single-chip multi-wavelength chips emit total wavelength light including m different wavelengths of blue light, n different wavelengths of green light, and l different wavelengths of red light.

6. The backlight of claim 1, comprising at least two single-chip multi-wavelength chips, d green light conversion materials, and e red light conversion materials, wherein the at least two single-chip multi-wavelength chips emit total wavelength light including a different wavelengths of blue light, b different wavelengths of green light, and c different wavelengths of red light, and a + b + c ≥ 4, a = m, b + d = n, c + e = l, and d + e ≥ 1.

7. The backlight of claim 1, comprising at least one single-chip multi-wavelength chip and at least one single-chip single-wavelength chip, wherein the at least one single-chip multi-wavelength chip emits wavelength light including f different wavelengths of blue light, g different wavelengths of green light, and h different wavelengths of red light, and the at least one single-chip single-wavelength chip emits total wavelength light including i different wavelengths of blue light, j different wavelengths of green light, and k different wavelengths of red light, and f + g + h ≥ 2, f + i = m, g + j = n, and h + k = l.

8. The backlight of claim 1, comprising a plurality of single-chip single-wavelength chips, wherein the plurality of single-chip single-wavelength chips emit total wavelength light including m different wavelengths of blue light, n different wavelengths of green light, and l different wavelengths of red light.

9. The backlight of claim 1, comprising at least one single-chip single-wavelength chip, d green light conversion materials, and e red light conversion materials, wherein the at least one single-chip single-wavelength chip emits total wavelength light including a different wavelengths of blue light, b different wavelengths of green light, and c different wavelengths of red light, and a + b + c ≥ 1, a = m, b + d = n, c + e = l, and d + e ≥ 1.

10. The backlight source of claim 1, comprising at least one single-core multi-wavelength chip, at least one single-core single-wavelength chip, d green light conversion materials, and e red light conversion materials, the at least one single-core multi-wavelength chip emitting wavelength light comprising f different wavelengths of blue light, g different wavelengths of green light, and h different wavelengths of red light, the at least one single-core single-wavelength chip emitting total wavelength light comprising i different wavelengths of blue light, j different wavelengths of green light, and k different wavelengths of red light, wherein f+g+h≥2, i+j+k≥l, f+i=m, g+j+d=n, h+k+e=l, d+e≥l.

11. The backlight of any of claims 4 or 6 or 9 or 10, wherein, The green light conversion material comprises a phosphor or a quantum dot material; or The red light conversion material comprises a phosphor or a quantum dot material; or The green light conversion material and the red light conversion material both comprise a phosphor or a quantum dot material.

12. The backlight of any of claims 3-7, wherein, The single-core multi-wavelength chip is purely electroluminescent or a combination of electroluminescent and photoluminescent.

13. A display device comprising the backlight source of any one of claims 1-12 and a liquid crystal panel, the backlight source being located under the liquid crystal panel to provide light for the liquid crystal panel.

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