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 is configured to provide m blue light with different wavelengths, n green light with different wavelengths and l red light with different wavelengths, m > = 1, n > = 1, l > = 1, m + n > = 2, and m + n + l > = 4. By increasing the number of primary colors in the backlight source, polygonal wide-color-gamut backlight is obtained, the adjustable range of the backlight is large, the lifting space of the color gamut is large, the technical difficulty is low, and the cost is low.

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 color gamut of an LCD display device is mainly related to the backlight, and also to the filter layer of the liquid crystal panel.

[0003] The existing technologies for improving the color gamut of LCD display devices mainly include: 1. Improving the backlight, by changing the type of LED phosphor or using quantum dot materials to improve the backlight color gamut. The existing technologies all use three primary colors, that is, a triangular color gamut backlight. This method changes the type of LED phosphor, with a small adjustable range and little room for improving the color gamut; using quantum dot materials is costly, and the life of quantum dot materials is short and the reliability is poor; 2. Improving the liquid crystal panel, by increasing the structure of the filter layer, from the original three colors to four colors. This method only increases the number of filter layers and sub-pixels, which is limited by the traditional backlight source, resulting in little room for improving the color gamut. Summary of the invention

[0004] Based on this, the present application provides a backlight source and a display device, the backlight being a polygonal wide color gamut backlight, the backlight having a large adjustable range, a large room for color gamut improvement, low technical difficulty, and low cost. In particular, the backlight provided by the present application can match the multi-primary color liquid crystal panel in the prior art, and the combination of the two makes the color gamut improvement room very large.

[0005] On the one hand, the present application provides a backlight source, which is configured to provide m blue lights of different wavelengths, n green lights of different wavelengths, and l red lights of different wavelengths, wherein m≥1, n≥1, l≥1, m+n≥2, m+n+l≥4. That is, the backlight source has an n-gonal wide color gamut, n≥4.

[0006] In some possible implementations, the wavelength of blue light is greater than or equal to 410 nm and less than 500 nm, the wavelength of green light is greater than or equal to 500 nm and less than 565 nm, and the wavelength of red light is greater than or equal to 565 nm and less than or equal to 700 nm.

[0007] In some possible implementations, the backlight source includes a single-core multi-wavelength chip, and the light emission wavelengths of the single-core multi-wavelength chip include m different wavelengths of blue light, n different wavelengths of green light, and 1 different wavelength of red light.

[0008] In some possible implementations, the backlight source includes a single-core multi-wavelength chip, d types of green light conversion materials and e types of red light conversion materials. 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, where a=m, b+d=n, c+e=l, a+b+c≥2, d+e≥1.

[0009] In some possible implementations, the backlight source includes at least two single-core multi-wavelength chips, and the total light emission wavelength of the at least two single-core multi-wavelength chips includes m different wavelengths of blue light, n different wavelengths of green light, and 1 different wavelength of red light.

[0010] In some possible implementations, the backlight source includes at least two single-core multi-wavelength chips, d types of green light conversion materials and e types of red light conversion materials. The total light emission wavelength of the at least two single-core 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, d+e≥1.

[0011] In some possible implementations, 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 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, and the total light-emitting wavelength of 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, where f+g+h≥2, f+i=m, g+j=n, h+k=l.

[0012] 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 green light conversion materials and e red light conversion materials, the light emission wavelength of 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, and the total light emission wavelength of 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, where f+g+h≥2, i+j+k≥1, f+i=m, g+j+d=n, h+k+e=l, d+e≥1.

[0013] In some possible implementations, the backlight source includes multiple single-core single-wavelength chips, and the total light emission wavelength of the multiple single-core single-wavelength chips includes m different wavelengths of blue light, n different wavelengths of green light, and 1 different wavelength of red light.

[0014] In some possible implementations, the backlight source includes at least one single-core single-wavelength chip, d types of green light conversion materials and e types of red light conversion materials. The total light emission wavelength of the at least one single-core single-wavelength chip includes a different wavelengths of blue light, b different wavelengths of green light and c different wavelengths of red light, where a+b+c≥1, a=m, b+d=n, c+e=l, d+e≥1.

[0015] In some possible implementations, the backlight source is a direct-lit, edge-lit, or mini backlight.

[0016] In some possible implementations, the backlight source adopts COB, SMD or IMD packaging technology.

[0017] In some possible implementations, the green light conversion material includes phosphor or quantum dot material; and / or

[0018] Red light conversion materials include phosphors or quantum dot materials.

[0019] In some possible implementations, the single-core multi-wavelength chip is pure electroluminescent or a combination of electroluminescent and photoluminescent.

[0020] On the other hand, the present application provides a display device, comprising the above-mentioned backlight source.

[0021] The backlight source and display device provided by the present application. By changing the primary colors provided by the backlight source from three to at least four primary colors, that is, the backlight source has an N-sided wide color gamut, N ≥ 4. The number of primary colors in the backlight source is increased, so as to obtain a polygonal wide color gamut backlight, the backlight has a large adjustable range, a large room for improvement in the color gamut, low technical difficulty, and low cost. In particular, the backlight provided by the present application can match the multi-primary color liquid crystal panel in the prior art, and the combination of the two makes the color gamut improvement room very large. The backlight source and display device provided by the present application upgrade the performance of display industry products, and can meet the image quality improvement needs of various types of displays. The BT2020 ratio is increased by at least 40%, and the BT2020 coverage is increased by at least 23%. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 It is a chromaticity diagram (CIE chromaticity diagram) of a triangular color gamut backlight in the prior art;

[0024] Figure 2 One of the chromaticity diagrams (CIE chromaticity diagrams) of the backlight source provided in the embodiment of the present application;

[0025] Figure 3 The second chromaticity diagram (CIE chromaticity diagram) of the backlight source provided in the embodiment of the present application;

[0026] Figure 4 This is a comparison chart of the quadrilateral color gamut provided by the four-primary-color liquid crystal panel in the prior art with the traditional backlight source and the embodiment of the present application. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The color gamut of a display device is very important. The larger the color gamut, the more colors it can reproduce. The color gamut of an LCD display device is mainly related to the backlight, and also to the filter layer of the liquid crystal panel.

[0033] The existing technologies for improving the color gamut of LCD display devices mainly include: 1. Improving the backlight, by changing the type of LED phosphor or using quantum dot materials to improve the backlight color gamut, and the existing technologies all use three primary colors, that is, a triangular color gamut backlight, such as Figure 1 As shown in the figure, this method changes the type of LED phosphor, has a small adjustable range, and has little room for improving the color gamut; the use of quantum dot materials is costly, and the life of quantum dot materials is short and the reliability is poor; second, improve the LCD panel by increasing the number of filter layers and sub-pixels, from the original three colors to four colors. This method only increases the number of filter layers and sub-pixels, which is limited by the traditional backlight source, resulting in little room for improving the color gamut. Figure 4 As shown in the small rectangular area inside the middle, because the traditional backlight source is still a triangular color gamut and the half-peak width is relatively wide, even if the LCD panel is multi-primary color, the multi-primary color gamut emitted from the display device is still relatively small when paired with a traditional backlight source.

[0034] After repeated thinking and verification, the inventor discovered that if the backlight is configured and the primary colors of the backlight are increased so that the color gamut of the backlight light source of the display device is changed from a triangular color gamut of the three primary colors to a polygonal color gamut, the color gamut of the backlight becomes wider, the adjustable range of the backlight becomes larger, and there is a lot of room for improvement in the color gamut. In particular, the backlight provided in the present application can match the multi-primary color liquid crystal panel in the prior art. The combination of the two makes it very easy to improve the color gamut.

[0035] In view of this, the present application provides a backlight light source, which is configured to provide blue light of m different wavelengths, green light of n different wavelengths and red light of l different wavelengths, wherein m≥1, n≥1, l≥1, m+n≥2, m+n+l≥4.

[0036] 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 primary colors, thereby obtaining a polygonal wide color gamut backlight. The backlight has a large adjustable range and a large room for improvement in the color gamut. In particular, the backlight provided by the present application can match the multi-primary color liquid crystal panel in the prior art. The combination of the two makes it possible to greatly improve the color gamut.

[0037] 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.

[0038] The backlight source provided in the embodiment of the present application is used in a display device. The backlight source is used to provide a polygonal wide color gamut backlight, thereby improving the color gamut of the display device.

[0039] The backlight source increases the primary colors of the backlight, changing the three wavelengths in the prior art to at least four wavelengths, thereby obtaining a polygonal wide color gamut backlight.

[0040] Specifically, the backlight source is configured to provide m blue lights of different wavelengths, n green lights of different wavelengths, and l red lights of different wavelengths.

[0041] Among them, m≥1, n≥1, l≥1, m+n≥2, m+n+l≥4.

[0042] In some possible implementations, the wavelength of blue light provided by the backlight source is greater than or equal to 410nm and less than 500nm, the wavelength of green light is greater than or equal to 500nm and less than 565nm, and the wavelength of red light is greater than or equal to 565nm and less than or equal to 700nm.

[0043] In some possible implementations, the backlight source is a quadrilateral wide color gamut backlight, such as including 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.

[0044] In some possible implementations, the backlight source is a pentagonal wide color gamut backlight, such as including 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.

[0045] In some possible implementations, the backlight source is a hexagonal wide color gamut backlight, such as including 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.

[0046] Table 1 shows the color gamut space comparison of the prior art and the quadrilateral wide color gamut backlight and the pentagonal wide color gamut backlight of the present application.

[0047] Table 1 Comparison of color gamut space of triangular, quadrilateral and pentagonal wide color gamut backlight

[0048] plan BT2020 ratio BT2020 coverage Prior art triangle 87.4％ 80％ Quad Wide Color Gamut 126.7％ 98.4％ Pentagonal wide color gamut 135.1％ 98.6％

[0049] Among them, BT2020 ratio represents the color primaries and color encoding method in the color space in the BT2020 standard. BT2020 coverage represents the color gamut coverage in the BT2020 standard.

[0050] Compared with the triangular color gamut of the three primary colors in the existing technology, the polygonal wide color gamut backlight BT2020 ratio is increased by at least 40%; the BT2020 coverage is increased by at least 23%.

[0051] It can be seen that by adopting the backlight source provided in this application, the BT2020 ratio and BT2020 coverage are significantly improved.

[0052] In some possible implementations, the backlight source is a direct-lit, edge-lit, or mini backlight.

[0053] In some possible implementations, the backlight source adopts COB, SMD or IMD packaging technology.

[0054] The backlight source can achieve polygonal wide color gamut backlight through a variety of different packaging solutions, such as through a full chip solution, or a chip plus color conversion material solution.

[0055] The color conversion material may be fluorescent powder or quantum dot material or other color conversion materials.

[0056] In some possible implementations, the backlight source includes a single-core multi-wavelength chip. A single-core multi-wavelength chip includes all primary colors in the polygonal wide color gamut backlight. That is, the light emission wavelengths of the single-core multi-wavelength chip include m different wavelengths of blue light, n different wavelengths of green light, and l different wavelengths of red light.

[0057] All wavelengths of light are provided through a single-core multi-wavelength chip.

[0058] For example, in a quadrilateral wide color gamut backlight, a single-core multi-wavelength chip contains 1 wavelength of blue light, 2 different wavelengths of green light and 1 wavelength of red light.

[0059] For example, in a pentagonal wide color gamut backlight, a single-core multi-wavelength chip contains 2 different wavelengths of blue light, 2 different wavelengths of green light and 1 wavelength of red light.

[0060] For example, in a hexagonal wide color gamut backlight, a single-core multi-wavelength chip contains 2 different wavelengths of blue light, 3 different wavelengths of green light and 1 wavelength of red light.

[0061] In some possible implementations, the backlight source includes a single-core multi-wavelength chip and one or more color conversion materials. The single-core multi-wavelength chip contains only the primary colors of some wavelengths 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 primary colors of the remaining wavelengths in the polygonal wide color gamut backlight.

[0062] That is, the backlight source includes a single-core multi-wavelength chip, d green light conversion materials and e red light conversion materials. The single-core multi-wavelength chip emits a different wavelength of blue light, b different wavelengths of green light and c different wavelengths of red light.

[0063] Among them, a=m, b+d=n, c+e=l, a+b+c≥2, d+e≥1.

[0064] Among them, one or more wavelengths in the single-core multi-wavelength chip are wavelengths required to excite the color conversion material to emit, that is, at least one wavelength in the single-core multi-wavelength chip is smaller than the wavelengths of all color conversion materials.

[0065] For example, in a quadrilateral wide color gamut backlight, a 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 through a red light conversion material. Or, a single-core multi-wavelength chip contains 1 wavelength of blue light and 1 wavelength of green light, and another wavelength of green light is converted through a green light conversion material, and 1 wavelength of red light is converted through a red light conversion material. Or, a 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 through a red light conversion material.

[0066] For example, in a pentagonal wide color gamut backlight, a single-core multi-wavelength chip contains 2 different wavelengths of blue light and 2 different wavelengths of green light, and converts 1 wavelength of red light through a red light conversion material. Or, a single-core multi-wavelength chip contains 2 different wavelengths of blue light and 1 wavelength of green light, and converts another wavelength of green light through a green light conversion material, and converts 1 wavelength of red light through a red light conversion material.

[0067] For example, in a hexagonal wide color gamut backlight, a single-core multi-wavelength chip contains 2 different wavelengths of blue light and 2 different wavelengths of green light, and another wavelength of green light is converted through a green light conversion material, and 1 wavelength of red light is converted through a red light conversion material. Or, a 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 through a red light conversion material.

[0068] Preferably, a single-core multi-wavelength chip, or a single-core multi-wavelength chip + 1 / multiple color conversion materials is used, which has low cost, simple circuit, simple control, simple packaging, and a wider color gamut.

[0069] In some possible implementations, the backlight source includes at least two single-core multi-wavelength chips. The at least two single-core multi-wavelength chips include all primary colors in the polygonal wide color gamut backlight.

[0070] That is, the total light emission wavelength of at least two single-core multi-wavelength chips includes m different wavelengths of blue light, n different wavelengths of green light, and 1 different wavelength of red light.

[0071] For example, in a quadrilateral wide color gamut backlight, a single-core multi-wavelength chip contains 1 wavelength of blue light and 1 wavelength of green light. Another single-core multi-wavelength chip contains another wavelength of blue light and 1 wavelength of red light. Or, a single-core multi-wavelength chip contains 1 wavelength of blue light and 1 wavelength of green light. Another single-core multi-wavelength chip contains another wavelength of green light and 1 wavelength of red light. Or, a single-core multi-wavelength chip contains 2 different wavelengths of blue light. Another single-core multi-wavelength chip contains 1 wavelength of green light and 1 wavelength of red light.

[0072] For example, in a pentagonal wide color gamut backlight, a single-core multi-wavelength chip contains 2 different wavelengths of blue light and 1 wavelength of green light. Another single-core multi-wavelength chip contains another wavelength of green light and 1 wavelength of red light. Or, a 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 and 1 wavelength of red light.

[0073] For example, in a hexagonal wide color gamut backlight, a single-core multi-wavelength chip contains 2 different wavelengths of blue light and 2 different wavelengths of green light. Another single-core multi-wavelength chip contains another wavelength of green light and 1 wavelength of red light. Or, a single-core multi-wavelength chip contains 1 wavelength of blue light and 3 different wavelengths of green light. Another single-core multi-wavelength chip contains another wavelength of blue light and 1 wavelength of red light. Or, a 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 green light and 1 wavelength of red light.

[0074] In some possible implementations, the backlight source includes at least two single-core multi-wavelength chips and one or more color conversion materials. At least two single-core multi-wavelength chips contain primary colors of some wavelengths in the polygonal wide color gamut backlight, and the light in the single-core multi-wavelength chips is converted by the color conversion material to obtain the primary colors of the remaining wavelengths in the polygonal wide color gamut backlight.

[0075] That is, the backlight source includes at least two single-core multi-wavelength chips, d green light conversion materials and e red light conversion materials. The total emission wavelength of the at least two single-core multi-wavelength chips includes a different wavelength of blue light, b different wavelengths of green light and c different wavelengths of red light.

[0076] Among them, a+b+c≥4, a=m, b+d=n, c+e=l, d+e≥1.

[0077] Among them, one or more wavelengths in the single-core multi-wavelength chip are wavelengths required to excite the color conversion material to emit, that is, at least one wavelength in the single-core multi-wavelength chip is smaller than the wavelengths of all color conversion materials.

[0078] For example, in a pentagonal wide color gamut backlight, a 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 through a red light conversion material. Or, a single-core multi-wavelength chip contains 1 wavelength of blue light and 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 through a red light conversion material.

[0079] For example, in a hexagonal wide color gamut backlight, a single-core multi-wavelength chip contains 2 different wavelengths of blue light. Another single-core multi-wavelength chip contains another wavelength of blue light and 1 wavelength of green light. Another wavelength of green light is converted by a green light conversion material, and 1 wavelength of red light is converted by a red light conversion material. Or, a single-core multi-wavelength chip contains 1 wavelength of blue light and 1 wavelength of green light. Another single-core multi-wavelength chip contains another wavelength of blue light and another 2 different wavelengths of green light. 1 wavelength of red light is converted by a red light conversion material.

[0080] For example, 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. The red light of another wavelength is converted by the red light conversion material.

[0081] In some possible implementations, the backlight source includes at least one single-core multi-wavelength chip and at least one single-core single-wavelength chip. At least one single-core multi-wavelength chip includes primary colors of some wavelengths in the polygonal wide color gamut backlight, and at least one single-core single-wavelength chip includes primary colors of remaining wavelengths in the polygonal wide color gamut backlight.

[0082] 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 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, and the total light-emitting wavelength of 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.

[0083] Among them, f+g+h≥2, f+i=m, g+j=n, h+k=l.

[0084] For example, in a quadrilateral wide color gamut backlight, a single-core multi-wavelength chip contains 1 wavelength of blue light and 1 wavelength of green light, the first single-core single-wavelength chip contains another wavelength of blue light, and the second single-core single-wavelength chip contains 1 wavelength of red light. Or, a single-core multi-wavelength chip contains 1 wavelength of blue light and 2 wavelengths of green light, and a single-core single-wavelength chip contains 1 wavelength of red light.

[0085] For example, in a pentagonal wide color gamut backlight, the first 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, and a single-core single-wavelength chip contains 1 wavelength of red light. Or, a single-core multi-wavelength chip contains 1 wavelength of blue light and 2 different wavelengths of green light, the first single-core single-wavelength chip contains another wavelength of green light, and the second single-core single-wavelength chip contains 1 wavelength of red light.

[0086] For example, in a hexagonal wide color gamut backlight, the first single-core multi-wavelength chip contains 2 different wavelengths of blue light, the second single-core multi-wavelength chip contains another wavelength of blue light and 1 wavelength of green light, the first single-core single-wavelength chip contains another wavelength of green light, and the second single-core single-wavelength chip contains 1 wavelength of red light. Or, the first single-core multi-wavelength chip contains 1 wavelength of blue light and 1 wavelength of green light, the second single-core multi-wavelength chip contains another wavelength of blue light and another 2 different wavelengths of green light, and a single-core single-wavelength chip contains 1 wavelength of red light.

[0087] 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 green light conversion materials, and e red light conversion materials. At least one single-core multi-wavelength chip contains primary colors of some wavelengths in the polygonal wide color gamut backlight, and at least one single-core single-wavelength chip contains primary colors of some wavelengths 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 primary colors of the remaining wavelengths in the polygonal wide color gamut backlight.

[0088] That is, the backlight source 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 light emission wavelength of 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, and the total light emission wavelength of 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.

[0089] Among them, f+g+h≥2, i+j+k≥1, f+i=m, g+j+d=n, h+k+e=l, d+e≥1.

[0090] Among them, one or more wavelengths in the single-core multi-wavelength chip or the single-core single-wavelength chip are the wavelengths required to excite the color conversion material, 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 color conversion materials.

[0091] For example, in a hexagonal wide color gamut backlight, the first single-core multi-wavelength chip contains 2 different wavelengths of blue light, the second single-core multi-wavelength chip contains another wavelength of blue light and 1 wavelength of green light, the single-core single-wavelength chip contains another wavelength of green light, and converts one wavelength of red light through a red light conversion material. Or, the single-core multi-wavelength chip contains 1 wavelength of blue light and 1 wavelength of green light, the single-core single-wavelength chip contains another wavelength of blue light, converts another 2 different wavelengths of green light through a green light conversion material, and converts one wavelength of red light through a red light conversion material.

[0092] In some possible implementations, the backlight source includes a plurality of single-core single-wavelength chips, which include all primary colors in the polygonal wide color gamut backlight.

[0093] That is, the total light emission wavelength of multiple single-core single-wavelength chips includes m different wavelengths of blue light, n different wavelengths of green light and l different wavelength of red light.

[0094] For example, in a quadrilateral 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, and the fourth 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 1 wavelength of green light, the third single-core single-wavelength chip contains another wavelength of green light, and the fourth single-core single-wavelength chip contains 1 wavelength of red light.

[0095] For example, in a pentagonal 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.

[0096] For example, in a hexagonal 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.

[0097] In some possible implementations, the backlight source includes at least one single-core single-wavelength chip and one or more color conversion materials. At least one single-core single-wavelength chip contains the primary colors of some wavelengths in the polygonal wide color gamut backlight, and the light in the single-core single-wavelength chip is converted by the color conversion material to obtain the primary colors of the remaining wavelengths in the polygonal wide color gamut backlight.

[0098] That is, the backlight source includes at least one single-core single-wavelength chip, d types of green light conversion materials and e types of red light conversion materials, and the total light emission wavelength of at least one single-core single-wavelength chip includes a different wavelengths of blue light, b different wavelengths of green light and c different wavelengths of red light.

[0099] Among them, a+b+c≥1, a=m, b+d=n, c+e=l, d+e≥1.

[0100] Among them, one or more wavelengths in the single-core single-wavelength chip are wavelengths required to excite the color conversion material to emit, that is, at least one wavelength in the single-core single-wavelength chip is smaller than the wavelengths of all color conversion materials.

[0101] For example, in a quadrilateral 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, and the third single-core single-wavelength chip contains 1 wavelength of green light, which is converted into 1 wavelength of red light through a red light conversion material. Or the first single-core single-wavelength chip contains 1 wavelength of blue light, the second single-core single-wavelength chip contains 1 wavelength of green light, and the third single-core single-wavelength chip contains another wavelength of green light, which is converted into 1 wavelength of red light through a red light conversion material.

[0102] For example, in a pentagonal 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, another wavelength of green light is converted through a green light conversion material, and 1 wavelength of red light is converted through a red light conversion material. 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, and the fourth single-core single-wavelength chip contains another wavelength of green light, and 1 wavelength of red light is converted through a red light conversion material.

[0103] For example, in a hexagonal 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 a third wavelength of green light, and 1 wavelength of red light is converted by a red light conversion material. 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 third wavelength of green light is converted by a green light conversion material, and 1 wavelength of red light is converted by a red light conversion material.

[0104] In some possible implementations, the green light conversion material includes phosphor or quantum dot material; and / or the red light conversion material includes phosphor or quantum dot material.

[0105] In some possible implementations, the single-core multi-wavelength chip is pure electroluminescence only, or a combination of electroluminescence and photoluminescence.

[0106] like Figure 2 As shown, it is a chromaticity diagram (CIE chromaticity diagram) of the quadrilateral wide color gamut backlight source provided in an embodiment of the present application.

[0107] This embodiment uses a single-core multi-wavelength chip and a phosphor material.

[0108] Specifically, the single-core multi-wavelength chip contains 1 wavelength of blue light and 2 different wavelengths of green light, which are converted into 1 wavelength of red light through phosphor materials.

[0109] Among them, the wavelength of blue light is 455nm, and the half width is 18nm; the wavelength of the first green light is 500nm, and the half width is 25nm; the wavelength of the second green light is 530nm, and the half width is 25nm; the phosphor material is KSF powder (fluoride red phosphor), and the wavelength of the converted red light is 620nm.

[0110] It can be seen that the BT2020 ratio and BT2020 coverage of the quadrilateral wide color gamut backlight source provided in this embodiment are significantly improved compared to the triangular color gamut.

[0111] like Figure 3 As shown, it is a chromaticity diagram (CIE chromaticity diagram) of the pentagonal wide color gamut backlight source provided in an embodiment of the present application.

[0112] This embodiment uses a single-core multi-wavelength chip and a phosphor material.

[0113] Specifically, the single-core multi-wavelength chip contains 2 different wavelengths of blue light and 2 different wavelengths of green light, which are converted into 1 wavelength of red light through phosphor material.

[0114] Among them, the wavelength of the first blue light is 455nm, and the half width is 18nm; the wavelength of the second blue light is 495nm, and the half width is 20nm; the wavelength of the first green light is 505nm, and the half width is 25nm; the wavelength of the second green light is 530nm, and the half width is 25nm; the phosphor material is KSF powder, and the wavelength of the converted red light is 620nm.

[0115] It can be seen that the BT2020 ratio and BT2020 coverage of the quadrilateral wide color gamut backlight source provided in this embodiment are significantly improved compared to the triangular color gamut.

[0116] Figure 4 This is a comparison chart of the quadrilateral color gamut provided by the four-primary-color liquid crystal panel in the prior art with the traditional backlight source and the embodiment of the present application.

[0117] Among them, the outermost quadrilateral area is the quadrilateral color gamut provided by the embodiment of the present application, and the middle quadrilateral area is the quadrilateral color gamut of the four-primary color liquid crystal panel with the traditional backlight source in the prior art. It can be seen that compared with the multi-primary color liquid crystal panel in the prior art, the quadrilateral wide color gamut backlight source provided by this embodiment has a significant improvement in BT2020 ratio and BT2020 coverage.

[0118] The backlight source provided in the present application is configured to provide blue light of m different wavelengths, green light of n different wavelengths and red light of l different wavelengths, wherein m≥1, n≥1, l≥1, m+n≥2, m+n+l≥4.

[0119] By changing the primary colors provided by the backlight light source from three to at least four primary colors, 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 backlight has a large adjustable range, a large room for improvement in the color gamut, good reliability, and a long life; in particular, the backlight provided in the present application can match the multi-primary color liquid crystal panel in the prior art, and the combination of the two makes it possible to greatly improve the color gamut.

[0120] In addition, an embodiment of the present application also provides a display device, including the above-mentioned backlight source.

[0121] The display device provided by 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 primary colors, thereby obtaining a polygonal wide color gamut backlight. Compared with the existing three-primary color backlight, the backlight provided by the present application has a large adjustable range, a large room for improvement in the color gamut, good reliability, and a long life. In particular, the backlight provided by the present application can match the multi-primary color liquid crystal panel in the prior art. The combination of the two makes the color gamut improvement room very large, which can meet the image quality improvement needs of various types of displays, thereby solving the problem of difficulty in color gamut improvement.

[0122] 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 is configured to provide blue light of m different wavelengths, green light of n different wavelengths and red light of l different wavelengths, wherein m≥1, n≥1, l≥1, m+n≥2, m+n+l≥4.

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

3. The backlight source according to claim 1, characterized in that: The backlight source includes a single-core multi-wavelength chip, and the light emission wavelengths of the single-core multi-wavelength chip include m different wavelengths of blue light, n different wavelengths of green light and 1 different wavelength of red light.

4. The backlight source according to claim 1, characterized in that: The backlight source includes a single-core multi-wavelength chip, d types of green light conversion materials and e types of red light conversion materials. 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, where a=m, b+d=n, c+e=l, a+b+c≥2, d+e≥1.

5. The backlight source according to claim 1, characterized in that: The backlight source includes at least two single-core multi-wavelength chips, and the total light emission wavelength of the at least two single-core multi-wavelength chips includes m different wavelengths of blue light, n different wavelengths of green light and 1 different wavelength of red light.

6. The backlight source according to claim 1, characterized in that: The backlight source includes at least two single-core multi-wavelength chips, d types of green light conversion materials and e types of red light conversion materials. The total light emission wavelength of at least two of the single-core 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, d+e≥1.

7. The backlight source according to claim 1, characterized in that: 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 f different wavelengths of blue light, g different wavelengths of green light and h different wavelengths of red light, and the total light-emitting wavelength of 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, wherein f+g+h≥2, f+i=m, g+j=n, h+k=l.

8. The backlight source according to claim 1, characterized in that: The backlight source includes a plurality of single-core single-wavelength chips, and the total light emission wavelength of the plurality of single-core single-wavelength chips includes m blue lights of different wavelengths, n green lights of different wavelengths, and 1 red light of different wavelength.

9. The backlight source according to claim 1, characterized in that: The backlight source includes at least one single-core single-wavelength chip, d types of green light conversion materials and e types of red light conversion materials. The total light emission wavelength of the at least one single-core single-wavelength chip includes a blue light of different wavelengths, b green light of different wavelengths and c red light of different wavelengths, wherein a+b+c≥1, a=m, b+d=n, c+e=l, d+e≥1.

10. The backlight source according to claim 1, characterized in that: The backlight source 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 light emission wavelength of the at least one single-core multi-wavelength chip includes f blue lights of different wavelengths, g green lights of different wavelengths and h red lights of different wavelengths. The total light emission wavelength of the at least one single-core single-wavelength chip includes i blue lights of different wavelengths, j green lights of different wavelengths and k red lights of different wavelengths, wherein f+g+h≥2, i+j+k≥1, f+i=m, g+j+d=n, h+k+e=l, d+e≥1.

11. The backlight source according to any one of claims 4, 6, 9 or 10, characterized in that: The green light conversion material includes phosphor or quantum dot material; and / or The red light conversion material includes phosphor or quantum dot material.

12. The backlight source according to any one of claims 3 to 7, characterized in that: The single-core multi-wavelength chip is pure electroluminescence or a combination of electroluminescence and photoluminescence.

13. A display device, characterized in that: Comprising a backlight source as described in any one of claims 1-12.

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