A high color gamut backlight module and display device

Abstract

The present application relates to the field of backlight display technology, and provides a high color gamut backlight module and display device, wherein the backlight module comprises: a substrate, a packaging structure, a fluorescent layer, a plurality of first light-emitting units and a second light-emitting unit arranged at intervals; the plurality of first light-emitting units and the second light-emitting units are located in the packaging structure; the fluorescent layer covers the packaging structure; the packaging structure comprises a light-mixing layer and a side wall, and the side wall is an opaque plate; the light-mixing layer comprises a reflective area and a light-mixing area, the reflective area is located at the edge of the light-mixing layer, and the light-mixing area is located in the middle of the light-mixing layer; a portion of the light excited by the plurality of first light-emitting units and the second light-emitting units enters the light-mixing area, and another portion of the light enters the reflective area, and the light entering the reflective area is reflected to the light-mixing area and mixed, and the mixed light is compensated by the fluorescent layer to form white light. The present application solves the problem in the prior art that the effect of mixing light between the blue light chip and the green light chip during the display process is poor, and color difference is prone to occur, resulting in insufficient display color purity.

Description

Technical Field

[0001] The present application relates to the technical field of backlight display, and more specifically, to a high color gamut backlight module and a display device. Background Art

[0002] Light Emitting Diode (LED) is a type of semiconductor diode that can convert electrical energy into light energy. LED has low operating voltage, low operating current, good shock and vibration resistance, high reliability, long life, and can easily modulate the intensity of light by modulating the current passing through. LED backlight technology is a backlight technology that uses light emitting diodes (LEDs) as light sources and is widely used in liquid crystal displays (LCDs) and TV screens.

[0003] In the existing LED backlight display solution, a light source structure of a blue light chip and a green light chip can be used as a light source to excite white light. However, in this display solution, the mixing effect of the blue light chip and the green light chip is poor, and color difference is prone to occur, resulting in insufficient color purity of the display. Summary of the invention

[0004] The purpose of the present application is to provide a high color gamut backlight module and a display device to solve the problem in the prior art that a light source structure of a blue light chip and a green light chip are used as a light source to excite white light. However, in this display solution, the mixing effect of the blue light chip and the green light chip is poor, and color difference is prone to occur, resulting in insufficient color purity of the displayed color.

[0005] Based on this, in the first aspect, the present application provides a high color gamut backlight module, comprising: a substrate, a packaging structure, a fluorescent layer, and a plurality of first light-emitting units and second light-emitting units arranged at intervals; the plurality of first light-emitting units and the second light-emitting units are arranged on the substrate and located in the packaging structure; the fluorescent layer covers the packaging structure; the packaging structure comprises a mixing layer and a side wall, the side wall is an opaque plate, and the light excited by the first light-emitting unit and the second light-emitting unit propagates outward from the mixing layer; wherein the mixing layer comprises a reflecting area and a mixing area, the reflecting area is located at the edge of the mixing layer, and the mixing area is located in the middle of the mixing layer, and the first light-emitting unit and the second light-emitting unit can excite light of different colors; a part of the light excited by the plurality of first light-emitting units and the second light-emitting units enters the mixing area, and the other part of the light enters the reflecting area, the light entering the reflecting area is reflected to the mixing area for mixing, and the mixed light is compensated by the fluorescent layer to form white light.

[0006] In combination with the high color gamut backlight module provided by the above solution, the first light-emitting unit excites blue light, the second light-emitting unit excites green light, and the fluorescent layer excites red light.

[0007] In combination with the high color gamut backlight module provided by the above solution, the reflective area is obliquely arranged at the edge of the light mixing layer and covers the light mixing area.

[0008] The high color gamut backlight module provided in combination with the above solution also includes a lens layer, which is coated around the packaging structure and the fluorescent layer.

[0009] The high color gamut backlight module provided in combination with the above solution further includes: a diffusion layer covering the lens layer; and a reflection layer covering the diffusion layer.

[0010] In combination with the high color gamut backlight module provided by the above solution, the outer surface of the lens layer is a curved surface with arcs.

[0011] In combination with the high color gamut backlight module provided by the above solution, the curved surface includes a first curved surface and a second curved surface, and the first curved surface is connected to the second curved surface to form a concave valley structure at the connection.

[0012] In combination with the high color gamut backlight module provided by the above solution, the curved surface further includes: a first vertical surface and a second vertical surface, the first vertical surface is connected to the first curved surface, and the second vertical surface is connected to the second curved surface.

[0013] In combination with the high color gamut backlight module provided by the above solution, the lens layer covers the packaging structure and the fluorescent layer without any gap.

[0014] In a second aspect, the present application provides a display device, comprising the high color gamut backlight module as described above.

[0015] The beneficial effect of a high color gamut backlight module provided by the present application is at least that: in the present solution, a plurality of first light-emitting units and a plurality of second light-emitting units are arranged at intervals and encapsulated by an encapsulation structure, the encapsulation structure includes a light-mixing layer and a side wall, the side wall is an opaque plate, the light-mixing layer is arranged on the plurality of first light-emitting units and the plurality of second light-emitting units, and the light excited by the first light-emitting units and the second light-emitting units propagates outward from the light-mixing layer. The encapsulation structure provided in the present solution can fully mix the blue light and the green light, and the red light is excited by the fluorescent layer to form white light, thereby improving the color gamut while reducing the color difference, and solving the technical problem that in the prior art, a light source structure of a blue light chip and a green light chip are used as a light source to excite white light, but in this display solution, the effect of mixing the blue light chip and the green light chip with each other is poor, and color difference is prone to occur, resulting in insufficient color purity of the displayed color. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only 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.

[0017] Figure 1 A schematic cross-sectional structure diagram of a high color gamut backlight module provided in one embodiment of the present application;

[0018] Figure 2 A schematic cross-sectional view of a packaging structure provided in one embodiment of the present application;

[0019] Figure 3 A schematic cross-sectional structure diagram of another high color gamut backlight module provided in one embodiment of the present application;

[0020] Figure 4 A schematic diagram of the appearance structure of a lens layer provided in one embodiment of the present application;

[0021] Figure 5 A schematic diagram of the structure of a first light-emitting unit provided in one embodiment of the present application;

[0022] Figure 6 A schematic diagram of the structure of a second light-emitting unit provided in one embodiment of the present application.

[0023] Among them, the reference numerals in the figure are:

[0024] 1. Substrate; 2. Packaging structure; 3. Fluorescent layer; 4. First light-emitting unit; 5. Second light-emitting unit; 6. Lens layer; 7. Diffusion layer; 8. Reflection layer; 21. Light-mixing layer; 22. Side wall; 41. First LED chip; 42. Arc lens layer; 51. Second LED chip; 61. First arc surface; 62. Concave valley structure; 63. Second arc surface; 64. First vertical surface; 65. Second vertical surface; 211. Reflection area; 212. Light-mixing area; 2111. Reflection surface. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0027] CSP (Chip Scale Package) technology is an advanced semiconductor packaging technology that makes the size of the packaged chip close to or equal to the size of the bare chip, greatly reducing the package volume. CSP technology has shown its unique advantages in many aspects. The development of CSP technology is of great significance to promoting the progress of the semiconductor packaging industry. It not only improves the performance of electronic products, but also makes it possible to design smaller and more efficient electronic systems.

[0028] Light Emitting Diode (LED) is a type of semiconductor diode that can convert electrical energy into light energy. LED has low operating voltage, low operating current, good shock and vibration resistance, high reliability, long life, and can easily modulate the intensity of light by modulating the current passing through. LED backlight technology is a backlight technology that uses light emitting diodes (LEDs) as light sources and is widely used in liquid crystal displays (LCDs) and TV screens.

[0029] LED display chips are increasingly using CSP packaging technology, which makes the size of the LED approach the size of the chip itself, helping to achieve miniaturization of LED products.

[0030] In the existing LED backlight display solution, a light source structure of a blue light chip and a green light chip can be used as a light source to excite white light. However, in this display solution, the mixing effect of the blue light chip and the green light chip is poor, and color difference is prone to occur, resulting in insufficient color purity of the display.

[0031] Therefore, the embodiment of the present application provides a high color gamut backlight module, such as Figure 1-4As shown, the backlight module includes: a substrate 1, a packaging structure 2, a fluorescent layer 3, and a plurality of first light-emitting units 4 and second light-emitting units 5 arranged at intervals; the plurality of first light-emitting units 4 and second light-emitting units 5 are arranged on the substrate 1 and located in the packaging structure 2; the fluorescent layer 3 covers the packaging structure 2; the packaging structure 2 includes a light-mixing layer 21 and a side wall 22, the side wall 22 is an opaque plate, and the light excited by the first light-emitting unit 4 and the second light-emitting unit 5 propagates outward from the light-mixing layer 21; wherein the light-mixing layer 21 includes a reflective area 211 and a light-mixing area 212, the reflective area 211 is located at the edge of the light-mixing layer 21, and the light-mixing area 212 is located in the middle of the light-mixing layer 21, and the first light-emitting unit 4 and the second light-emitting unit 5 can excite light of different colors; a part of the light excited by the plurality of first light-emitting units 4 and the second light-emitting unit 5 enters the light-mixing area 212, and another part of the light enters the reflective area 211, and the light entering the reflective area 211 is reflected to the light-mixing area 212 for mixing, and the mixed light is compensated by the fluorescent layer 3 to form white light.

[0032] Specifically, in this solution, the backlight module adopts a dual light source excitation solution, and the first light emitting unit 4 and the second light emitting unit 5 excite different colors of light. In one example, the first light emitting unit 4 can excite blue light, and the second light emitting unit 5 can excite green light; in another example, the first light emitting unit 4 can excite green light, and the second light emitting unit 5 can excite blue light. Similarly, the first light emitting unit 4 and the second light emitting unit 5 can be selected to excite other different colors of light according to the setting requirements, and this application does not make specific limitations.

[0033] A light-emitting circuit is provided on the substrate 1, and the first light-emitting unit 4 and the second light-emitting unit 5 are electrically connected to the light-emitting circuit. The first light-emitting unit 4 and the second light-emitting unit 5 can be soldered on the substrate 1 by a flip-chip process, and driven to emit light by the light-emitting circuit. The number of the first light-emitting unit 4 and the second light-emitting unit 5 can be multiple, and the multiple first light-emitting units 4 are arranged at intervals to enhance the light mixing effect of the adjacent first light-emitting units 4 and second light-emitting units 5.

[0034] The packaging structure 2 is provided outside the plurality of first light-emitting units 4 and the plurality of second light-emitting units 5, and the packaging structure 2 encapsulates the plurality of first light-emitting units 4 and the plurality of second light-emitting units 5. The packaging structure 2 includes a light-mixing layer 21 and a side wall 22, and the side wall 22 is an opaque plate, surrounding the plurality of first light-emitting units 4 and the plurality of second light-emitting units 5, and the opaque side wall 22 is provided to allow the light of the plurality of first light-emitting units 4 and the plurality of second light-emitting units 5 to enter the light-mixing layer 21 and propagate outward from the light-mixing layer 21.

[0035] In one embodiment, the light-mixing layer 21 includes two areas, namely a reflective area 211 and a light-mixing area 212. The reflective area 211 is located at the edge of the light-mixing layer 21, and the light-mixing area 212 is located in the middle of the light-mixing layer 21. The first light-emitting unit 4 and the second light-emitting unit 5 can excite light of different colors; a part of the light excited by the multiple first light-emitting units 4 and the second light-emitting units 5 enters the light-mixing area 212, and the other part of the light enters the reflective area 211. The light entering the reflective area 211 is reflected to the light-mixing area 212 and mixed. The mixed light is compensated by the fluorescent layer 3 to form white light.

[0036] Specifically, in this embodiment, the light-mixing area 212 and the light-reflecting area 211 can be arranged on the same horizontal layer. The light-reflecting area 211 is arranged at the edge of the horizontal layer, and the light-mixing area 212 is arranged in the middle of the horizontal layer. The light-reflecting area 211 has a light-reflecting surface 2111, which is the connecting surface between the light-reflecting area 211 and the light-mixing area 212. The light-reflecting surface 2111 is arranged obliquely and faces the light-mixing area 212. The light projected from the light-mixing area 212 can be reflected by the light-reflecting layer back to the light-mixing area 212. The reflected light enters the light-mixing area 212 from the light-reflecting surface 2111 and mixes again with the light in the light-mixing area 212. The cross-section of the light-mixing area 212 can be in a trapezoidal shape, the lower bottom surface of the trapezoid can be the bottom surface of the light-mixing layer 21 (or a part of the lower bottom surface of the light-mixing layer 21), and the upper bottom surface of the trapezoid is a part of the top surface of the light-mixing layer 21. The reflective area may be arranged along the waistline of the trapezoid to form a light mixing layer 21 with the light mixing area 212 having a rectangular cross section.

[0037] Taking the adjacent first light-emitting unit 4 and second light-emitting unit 5 as an example, the first light-emitting unit 4 and second light-emitting unit 5 emit light through the driving of the light-emitting circuit, and the light excited by the first light-emitting unit 4 and second light-emitting unit 5 is partially mixed in the packaging structure 2. Since the side wall 22 of the packaging structure 2 is an opaque plate, the partially mixed light and the unmixed light enter the light-mixing layer 21 directly or by reflection. The partially mixed light is usually located in the middle part of the first light-emitting unit 4 and the second light-emitting unit 5, and the partially unmixed light is usually located at the edge of the first light-emitting unit 4 and the second light-emitting unit 5. The partially mixed light enters the light-mixing layer 21 from the middle part of the light-mixing layer 21, and the partially unmixed light enters the light-mixing layer 21 from the edge of the light-mixing layer 21. After the partially unmixed light enters the light-mixing layer 21 from the edge, it is reflected by the reflective area 211 set at the edge of the light-mixing layer 21 to the light-mixing area 212, and is fully mixed with the partially mixed light in the light-mixing area 212. The mixed light then propagates outward through the top surface of the mixing layer. In this embodiment, the light emitted by the first light emitting unit 4 and the second light emitting unit 5 are fully mixed, which can improve the color gamut and reduce the color difference.

[0038] In one embodiment, the fluorescent layer 3 is arranged outside the light-mixing layer 21, and the fluorescent layer 3 can cover the light-mixing layer 21. The light transmitted from the light-mixing layer 21 can form white light after passing through the fluorescent layer 3. In this embodiment, red fluorescent powder is arranged on the fluorescent layer 3 to excite red light. After the blue light and green light excited by the first light-emitting unit 4 and the second light-emitting unit 5 are fully mixed, white light is formed through compensation by the fluorescent layer 3, thereby improving the color gamut and reducing the color difference.

[0039] Compared with the prior art, the present embodiment has a plurality of first light-emitting units 4 and a plurality of second light-emitting units 5 arranged at intervals and encapsulated by an encapsulation structure 2. The encapsulation structure 2 includes a light-mixing layer 21 and a side wall 22. The side wall 22 is an opaque plate. The light-mixing layer 21 is arranged on the plurality of first light-emitting units 4 and the plurality of second light-emitting units 5. The light excited by the first light-emitting units 4 and the second light-emitting units 5 propagates outward from the light-mixing layer 21. The encapsulation structure 2 provided in the present solution can fully mix the blue light and the green light, and the red light is excited by the fluorescent layer 3 to form white light for compensation. The color gamut is improved while the color difference is reduced. This solves the problem that in the prior art, a light source structure of a blue light chip and a green light chip is used as a light source to excite white light. However, in this display solution, the effect of mixing the light between the blue light chip and the green light chip is poor, and color difference is prone to occur, resulting in a technical problem of insufficient color purity of the displayed color.

[0040] In one embodiment, the light reflecting area 211 is obliquely disposed at the edge of the light mixing layer 21 and covers the light mixing area 212 .

[0041] Specifically, in this embodiment, the reflective area 211 is tilted on the light mixing layer 21, that is, there is an angle between the reflective area 211 and the light mixing area 212, and the reflective area 211 covers the light mixing area 212. The tilted reflective area 211 is conducive to reflecting the light entering the edge of the light mixing layer 21, and can reflect the light entering the edge of the light mixing layer 21 into the light mixing area 212, so that the light excited by the first light emitting unit 4 and the second light emitting unit 5 are fully mixed. The propagation path of light in the mixing layer is very complex, including multiple reflections and refractions, etc. Covering the reflective area 211 on the light mixing area 212 is conducive to the full mixing of light.

[0042] In one embodiment, the backlight module further includes a lens layer 6 , and the lens layer 6 is coated around the packaging structure 2 and the fluorescent layer 3 .

[0043] Specifically, in this embodiment, the lens layer 6 is coated outside the packaging structure 2 and the fluorescent layer 3, and the lens layer 6 can completely cover the surroundings of the packaging structure 2 and the fluorescent layer 3. The lens layer 6 can diffuse and propagate the light emitted by the first light-emitting unit 4 and the second light-emitting unit 5, and the shape of the lens layer 6 can be reasonably set according to the light diffusion effect. In an example, the lens layer 6 can be coated around the packaging structure 2 and the fluorescent layer 3 without a gap.

[0044] In one embodiment, the backlight module further includes: a diffusion layer 7 covering the lens layer 6 ; and a reflection layer 8 covering the diffusion layer 7 .

[0045] Specifically, in the present embodiment, the backlight module includes a diffusion layer 7 and a reflection layer 8 in addition to the lens layer 6, wherein the diffusion layer 7 covers the lens layer 6, and the reflection layer 8 covers the diffusion layer 7. The diffusion layer 7 is arranged on the surface of the lens layer 6, and the reflection layer 8 is arranged on the surface of the diffusion layer 7. The light excited by the first light-emitting unit 4 and the second light-emitting unit 5 is partially mixed in the packaging structure 2. The partially mixed light is usually located in the middle part of the first light-emitting unit 4 and the second light-emitting unit 5, and the partially unmixed light is usually located at the edge of the first light-emitting unit 4 and the second light-emitting unit 5. The partially mixed light enters the light-mixing layer 21 from the middle part of the light-mixing layer 21, and the partially unmixed light enters the light-mixing layer 21 from the edge of the light-mixing layer 21. After some unmixed light enters the light mixing layer 21 from the edge, it is reflected by the reflective area 211 set at the edge of the light mixing layer 21 to the light mixing area 212, and is fully mixed with the partially mixed light in the light mixing area 212. The mixed light is compensated by the fluorescent layer 3 to form white light, and the white light is transmitted outward through the lens layer 6, the diffusion layer 7 and the reflective layer 8, which can improve the color gamut and reduce chromatic aberration at the same time.

[0046] In one embodiment, the outer surface of the lens layer 6 is a curved surface with arcs. The curved surface includes a first curved surface 61 and a second curved surface 63, the first curved surface 61 is connected to the second curved surface 63, and a concave trough structure 62 is formed at the connection. The curved surface also includes: a first vertical surface 64 and a second vertical surface 65, the first vertical surface 64 is connected to the first curved surface 61, and the second vertical surface 65 is connected to the second curved surface 63.

[0047] Specifically, in this embodiment, the outer surface of the lens layer 6 includes a first curved surface 61 and a second curved surface 63, the first curved surface 61 and the second curved surface 63 can be integrally formed, and the surfaces of the two can be set to be arc-shaped, so the first curved surface 61 and the second curved surface 63 are connected to form a concave trough structure 62, and the packaging structure 2 where the first light-emitting unit 4 and the second light-emitting unit 5 are located is set in the middle position of the concave trough structure 62. The lens layer 6 forms two convex lens structures on both sides of the packaging structure 2, so that the light beam angle of the first light-emitting unit 4 and the second light-emitting unit 5 can be further opened through the first curved surface 61 and the second curved surface 63, so that the backlight module has a larger light-emitting angle.

[0048] In one embodiment, the lens layer 6 covers the packaging structure 2 and the fluorescent layer 3 without any gap.

[0049] Specifically, in this embodiment, the lens layer 6 covers the packaging structure 2 and the fluorescent layer 3 without gaps, and the lens layer 6 is seamlessly combined with the packaging structure 2 and the fluorescent layer 3, so that the first light-emitting unit 4 and the second light-emitting unit 5 in the packaging structure 2 have sufficient light-emitting angles, and can achieve a half-intensity angle of more than 160 degrees in one direction, which is conducive to uniform diffusion of light.

[0050] In one embodiment, the first light emitting unit 4 includes a first LED chip 41 and a curved lens layer 42. The curved lens layer 42 covers the first LED chip 41. The curved lens layer 42 can diffuse the light excited by the first LED chip 41, so that the light excited by the first LED chip 41 can be diffused more evenly.

[0051] Specifically, in this embodiment, the first LED chip 41 can be the above-mentioned blue light chip, and the curved lens layer 42 is encapsulated by CSP packaging technology. The shape of the curved lens layer 42 can be reasonably set according to the light diffusion effect. The curved lens layer 42 can also be wrapped around the first LED chip 41 without gaps.

[0052] Part of the light emitted from the front of the first LED chip 41 is refracted, diffuses outward through the arc lens layer 42, and enters the packaging structure 2, while the other part of the light is refracted and emitted from the side of the first LED chip 41. After multiple refractions and reflections, the light emitted by the first LED chip 41 is evenly diffused outward.

[0053] In one embodiment, the second light emitting unit 5 includes a second LED chip 51 and a curved lens layer 42. The curved lens layer 42 covers the second LED chip 51. The curved lens layer 42 can diffuse the light excited by the second LED chip 51, so that the light excited by the second LED chip 51 can be diffused more evenly.

[0054] Specifically, in this embodiment, the second LED chip 51 can be the green light chip mentioned above, and the curved lens layer 42 is encapsulated by CSP packaging technology. The shape of the curved lens layer 42 can be reasonably set according to the light diffusion effect. The curved lens layer 42 can also be wrapped around the second LED chip 51 without gaps.

[0055] Part of the light emitted from the front of the second LED chip 51 is refracted, diffuses outward through the arc lens layer 42, and enters the packaging structure 2, while another part of the light is refracted and emitted from the side of the second LED chip 51. After multiple refractions and reflections, the light emitted by the second LED chip 51 is evenly diffused outward.

[0056] In one embodiment, the first light emitting unit 4 and the second light emitting unit 5 can be arranged at intervals or adjacent to each other. The distance between the first light emitting unit 4 and the second light emitting unit 5 can be reasonably set according to the light mixing effect of the lens layer 6 with different structures.

[0057] The high color gamut backlight module provided in the embodiment of the present application includes: a substrate 1, a packaging structure 2, a fluorescent layer 3, and a plurality of first light-emitting units 4 and second light-emitting units 5 arranged at intervals; the plurality of first light-emitting units 4 and second light-emitting units 5 are located in the packaging structure 2; the fluorescent layer 3 covers the packaging structure 2; the packaging structure 2 includes a light-mixing layer 21 and a side wall 22, and the side wall 22 is an opaque plate; wherein the light-mixing layer 21 includes a reflective area 211 and a light-mixing area 212, the reflective area 211 is located at the edge of the light-mixing layer 21, and the light-mixing area 212 is located in the middle of the light-mixing layer 21; a part of the light excited by the plurality of first light-emitting units 4 and second light-emitting units 5 enters the light-mixing area 212, and another part of the light enters the reflective area 211, and the light entering the reflective area 211 is reflected to the light-mixing area 212 and mixed, and the mixed light is compensated by the fluorescent layer 3 to form white light. The invention solves the problem in the prior art that the effect of mixing light between the blue light chip and the green light chip during the display process is poor, and color difference is prone to occur, resulting in insufficient display color purity.

[0058] In addition, the present application also provides a display device, including the high color gamut backlight module as described above.

[0059] Specifically, in this embodiment, the display device may include a housing and a high color gamut backlight module, and the high color gamut backlight module is fixed to the housing. The high color gamut backlight module includes: a substrate 1, a packaging structure 2, a fluorescent layer 3, and a plurality of first light-emitting units 4 and second light-emitting units 5 arranged at intervals; the plurality of first light-emitting units 4 and second light-emitting units 5 are arranged on the substrate 1 and located in the packaging structure 2; the fluorescent layer 3 covers the packaging structure 2; the packaging structure 2 includes a mixing layer 21 and a side wall 22, the side wall 22 is an opaque plate, and the light excited by the first light-emitting unit 4 and the second light-emitting unit 5 propagates outward from the mixing layer 21; wherein the mixing layer 21 includes a reflecting area 211 and a mixing area 212, the reflecting area 211 is located at the edge of the mixing layer 21, and the mixing area 212 is located in the middle of the mixing layer 21, and the first light-emitting unit 4 and the second light-emitting unit 5 can excite light of different colors; a part of the light excited by the plurality of first light-emitting units 4 and the second light-emitting unit 5 enters the mixing area 212, and another part of the light enters the reflecting area 211, and the light entering the reflecting area 211 is reflected to the mixing area 212 for mixing, and the mixed light is compensated by the fluorescent layer 3 to form white light.

[0060] The backlight module can adopt a dual light source excitation scheme, and the first light emitting unit 4 and the second light emitting unit 5 can excite different colors of light. In one example, the first light emitting unit 4 can excite blue light, and the second light emitting unit 5 can excite green light; in another example, the first light emitting unit 4 can excite green light, and the second light emitting unit 5 can excite blue light. Similarly, the first light emitting unit 4 and the second light emitting unit 5 can be selected to excite other different colors of light according to the setting requirements, and this application does not make specific limitations.

[0061] A light-emitting circuit is provided on the substrate 1, and the first light-emitting unit 4 and the second light-emitting unit 5 are electrically connected to the light-emitting circuit. The first light-emitting unit 4 and the second light-emitting unit 5 can be soldered on the substrate 1 by a flip-chip process, and driven to emit light by the light-emitting circuit. The number of the first light-emitting unit 4 and the second light-emitting unit 5 can be multiple, and the multiple first light-emitting units 4 are arranged at intervals to enhance the light mixing effect of the adjacent first light-emitting units 4 and second light-emitting units 5.

[0062] The packaging structure 2 is provided outside the plurality of first light-emitting units 4 and the plurality of second light-emitting units 5, and the packaging structure 2 encapsulates the plurality of first light-emitting units 4 and the plurality of second light-emitting units 5. The packaging structure 2 includes a light-mixing layer 21 and a side wall 22, and the side wall 22 is an opaque plate, surrounding the plurality of first light-emitting units 4 and the plurality of second light-emitting units 5, and the opaque side wall 22 is provided to allow the light of the plurality of first light-emitting units 4 and the plurality of second light-emitting units 5 to enter the light-mixing layer 21 and propagate outward from the light-mixing layer 21.

[0063] The light-mixing layer 21 may include two areas, namely a reflective area 211 and a light-mixing area 212. The reflective area 211 is located at the edge of the light-mixing layer 21, and the light-mixing area 212 is located in the middle of the light-mixing layer 21. The first light-emitting unit 4 and the second light-emitting unit 5 can excite light of different colors; a part of the light excited by the multiple first light-emitting units 4 and the second light-emitting units 5 enters the light-mixing area 212, and the other part of the light enters the reflective area 211. The light entering the reflective area 211 is reflected into the light-mixing area 212 and mixed. The mixed light is compensated by the fluorescent layer 3 to form white light.

[0064] The light-mixing area 212 and the light-reflecting area 211 may be arranged on the same horizontal layer. The light-reflecting area 211 is arranged at the edge of the horizontal layer, and the light-mixing area 212 is arranged in the middle of the horizontal layer. The light-reflecting area 211 has a light-reflecting surface 2111, which is the connecting surface between the light-reflecting area 211 and the light-mixing area 212. The light-reflecting surface 2111 is arranged obliquely and faces the light-mixing area 212. The light projected from the light-mixing area 212 can be reflected by the light-reflecting layer back to the light-mixing area 212. The reflected light enters the light-mixing area 212 from the light-reflecting surface 2111 and mixes again with the light in the light-mixing area 212. The cross-section of the light-mixing area 212 may be in a trapezoidal shape, the lower bottom surface of the trapezoid may be the bottom surface of the light-mixing layer 21 (or a part of the lower bottom surface of the light-mixing layer 21), and the upper bottom surface of the trapezoid is a part of the top surface of the light-mixing layer 21. The reflective area may be arranged along the waistline of the trapezoid to form a light mixing layer 21 with the light mixing area 212 having a rectangular cross section.

[0065] The light excited by the first light-emitting unit 4 and the second light-emitting unit 5 is partially mixed in the packaging structure 2. Since the side wall 22 of the packaging structure 2 is an opaque plate, the partially mixed light and the unmixed light enter the light-mixing layer 21 directly or by reflection. The partially mixed light is usually located in the middle part of the first light-emitting unit 4 and the second light-emitting unit 5, and the partially unmixed light is usually located at the edge of the first light-emitting unit 4 and the second light-emitting unit 5. The partially mixed light enters the light-mixing layer 21 from the middle of the light-mixing layer 21, and the partially unmixed light enters the light-mixing layer 21 from the edge of the light-mixing layer 21. After the partially unmixed light enters the light-mixing layer 21 from the edge, it is reflected by the reflective area 211 set at the edge of the light-mixing layer 21 to the light-mixing area 212, and is fully mixed with the partially mixed light in the light-mixing area 212. The mixed light then propagates outward through the top surface of the mixing layer. In this embodiment, the light emitted by the first light-emitting unit 4 and the second light-emitting unit 5 is fully mixed, which can improve the color gamut and reduce color difference.

[0066] The fluorescent layer 3 is arranged outside the light-mixing layer 21, and the fluorescent layer 3 can cover the light-mixing layer 21. The light transmitted from the light-mixing layer 21 can form white light after passing through the fluorescent layer 3. In this embodiment, red fluorescent powder is arranged on the fluorescent layer 3 to excite red light. After the blue light and green light excited by the first light-emitting unit 4 and the second light-emitting unit 5 are fully mixed, white light is formed through compensation by the fluorescent layer 3, thereby improving the color gamut and reducing the color difference.

[0067] The reflective area 211 is obliquely arranged at the edge of the light-mixing layer 21 and covers the light-mixing area 212. The reflective area 211 is obliquely arranged at the light-mixing layer 21, that is, there is an angle between the reflective area 211 and the light-mixing area 212, and the reflective area 211 covers the light-mixing area 212. The obliquely arranged reflective area 211 is conducive to reflecting the light entering the edge of the light-mixing layer 21, and can reflect the light entering the edge of the light-mixing layer 21 into the light-mixing area 212, so that the light excited by the first light-emitting unit 4 and the second light-emitting unit 5 are fully mixed. The propagation path of light in the mixing layer is very complex, including multiple reflections and refractions, etc. Covering the reflective area 211 on the light-mixing area 212 is conducive to the full mixing of light.

[0068] The backlight module further includes a lens layer 6, which is coated around the encapsulation structure 2 and the fluorescent layer 3. The lens layer 6 is coated outside the encapsulation structure 2 and the fluorescent layer 3, and the lens layer 6 can be completely coated around the encapsulation structure 2 and the fluorescent layer 3. The lens layer 6 can diffuse and propagate the light emitted by the first light-emitting unit 4 and the second light-emitting unit 5, and the shape of the lens layer 6 can be reasonably set according to the light diffusion effect. In one example, the lens layer 6 can be coated around the encapsulation structure 2 and the fluorescent layer 3 without a gap.

[0069] In one embodiment, the backlight module further includes: a diffusion layer 7, which covers the lens layer 6; and a reflective layer 8, which covers the diffusion layer 7. In addition to the lens layer 6, the backlight module also includes a diffusion layer 7 and a reflective layer 8, wherein the diffusion layer 7 covers the lens layer 6, and the reflective layer 8 covers the diffusion layer 7. The diffusion layer 7 is arranged on the surface of the lens layer 6, and the reflective layer 8 is arranged on the surface of the diffusion layer 7. The light excited by the first light-emitting unit 4 and the second light-emitting unit 5 is partially mixed in the packaging structure 2. The partially mixed light is usually located in the middle part of the first light-emitting unit 4 and the second light-emitting unit 5, and the partially unmixed light is usually located at the edge of the first light-emitting unit 4 and the second light-emitting unit 5. The partially mixed light enters the light-mixing layer 21 from the middle part of the light-mixing layer 21, and the partially unmixed light enters the light-mixing layer 21 from the edge of the light-mixing layer 21. After some unmixed light enters the light mixing layer 21 from the edge, it is reflected by the reflective area 211 set at the edge of the light mixing layer 21 to the light mixing area 212, and is fully mixed with the partially mixed light in the light mixing area 212. The mixed light is compensated by the fluorescent layer 3 to form white light, and the white light is transmitted outward through the lens layer 6, the diffusion layer 7 and the reflective layer 8, which can improve the color gamut and reduce chromatic aberration at the same time.

[0070] The outer surface of the lens layer 6 is a curved surface with arcs. The curved surface includes a first curved surface 61 and a second curved surface 63, and the first curved surface 61 is connected to the second curved surface 63, and a concave trough structure 62 is formed at the connection. The curved surface also includes: a first vertical surface 64 and a second vertical surface 65, and the first vertical surface 64 is connected to the first curved surface 61, and the second vertical surface 65 is connected to the second curved surface 63.

[0071] The outer surface of the lens layer 6 includes a first curved surface 61 and a second curved surface 63, which can be integrally formed, and the surfaces of the two can be set to be arc-shaped, so the first curved surface 61 and the second curved surface 63 are connected to form a concave trough structure 62, and the packaging structure 2 where the first light-emitting unit 4 and the second light-emitting unit 5 are located is set in the middle of the concave trough structure 62. The lens layer 6 forms two convex lens structures on both sides of the packaging structure 2, so that the light beam angle of the first light-emitting unit 4 and the second light-emitting unit 5 can be further opened through the first curved surface 61 and the second curved surface 63, so that the backlight module has a larger light-emitting angle.

[0072] The lens layer 6 covers the packaging structure 2 and the fluorescent layer 3 without gaps, and the lens layer 6 is seamlessly combined with the packaging structure 2 and the fluorescent layer 3, so that the first light-emitting unit 4 and the second light-emitting unit 5 in the packaging structure 2 have sufficient light-emitting angles, and can achieve a half-intensity angle of more than 160 degrees in one direction, which is conducive to uniform diffusion of light.

[0073] The first light emitting unit 4 includes a first LED chip 41 and a curved lens layer 42. The curved lens layer 42 covers the first LED chip 41. The curved lens layer 42 can diffuse the light excited by the first LED chip 41, so that the light excited by the first LED chip 41 can be diffused more evenly.

[0074] The first LED chip 41 can be the above-mentioned blue chip, and the curved lens layer 42 is encapsulated by CSP packaging technology. The shape of the curved lens layer 42 can be reasonably set according to the light diffusion effect. The curved lens layer 42 can also be wrapped around the first LED chip 41 without gaps.

[0075] Part of the light emitted from the front of the first LED chip 41 is refracted, diffuses outward through the arc lens layer 42, and enters the packaging structure 2, while the other part of the light is refracted and emitted from the side of the first LED chip 41. After multiple refractions and reflections, the light emitted by the first LED chip 41 is evenly diffused outward.

[0076] The second light emitting unit 5 includes a second LED chip 51 and a curved lens layer 42. The curved lens layer 42 covers the second LED chip 51. The curved lens layer 42 can diffuse the light excited by the second LED chip 51, so that the light excited by the second LED chip 51 can be diffused more evenly.

[0077] The second LED chip 51 can be the green chip mentioned above, and the curved lens layer 42 is encapsulated by CSP packaging technology. The shape of the curved lens layer 42 can be reasonably set according to the light diffusion effect. The curved lens layer 42 can also be wrapped around the second LED chip 51 without gaps.

[0078] Part of the light emitted from the front of the second LED chip 51 is refracted, diffuses outward through the arc lens layer 42, and enters the packaging structure 2, while another part of the light is refracted and emitted from the side of the second LED chip 51. After multiple refractions and reflections, the light emitted by the second LED chip 51 is evenly diffused outward.

[0079] The first light emitting unit 4 and the second light emitting unit 5 can be arranged at intervals or adjacent to each other. The distance between the first light emitting unit 4 and the second light emitting unit 5 can be reasonably set according to the light mixing effect of the lens layer 6 with different structures.

[0080] The display device provided by the present application arranges multiple first light-emitting units 4 and multiple second light-emitting units 5 at intervals and encapsulates them through a packaging structure 2. The packaging structure 2 can fully mix the blue light and the green light, and excite the red light compensation through the fluorescent layer 3 to form white light, thereby improving the color gamut while reducing the color difference. This solves the problem in the prior art that a light source structure of a blue light chip and a green light chip are used as a light source to excite white light. However, in this display scheme, the effect of mixing light between the blue light chip and the green light chip is poor, and color difference is prone to occur, resulting in a technical problem of insufficient color purity of the displayed color.

[0081] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A high color gamut backlight module, characterized in that: include: A substrate, a packaging structure, a fluorescent layer, and a plurality of first light-emitting units and second light-emitting units arranged at intervals; A plurality of the first light-emitting units and the second light-emitting units are arranged on the substrate and located in the packaging structure; the fluorescent layer covers the packaging structure; The packaging structure includes a light-mixing layer and a side wall, the side wall is a light-proof plate, and the light excited by the first light-emitting unit and the second light-emitting unit propagates outward from the light-mixing layer; Among them, the mixing layer includes a reflective area and a mixing area, the reflective area is located at the edge of the mixing layer, and the mixing area is located in the middle of the mixing layer, the first light-emitting unit and the second light-emitting unit can excite light of different colors; a part of the light excited by the first light-emitting units and the second light-emitting units enters the mixing area, and the other part of the light enters the reflective area, the light entering the reflective area is reflected into the mixing area and mixed, and the mixed light is compensated by the fluorescent layer to form white light.

2. The high color gamut backlight module according to claim 1, characterized in that: The first light emitting unit excites blue light, the second light emitting unit excites green light, and the fluorescent layer excites red light.

3. The high color gamut backlight module according to claim 1, characterized in that: The light reflecting area is obliquely arranged at the edge of the light mixing layer and covers the light mixing area.

4. The high color gamut backlight module according to claim 1, characterized in that: It also includes a lens layer, which covers the encapsulation structure and the fluorescent layer.

5. The high color gamut backlight module according to claim 4, characterized in that: Also includes: A diffusion layer covering the lens layer; The reflective layer covers the diffusion layer.

6. The high color gamut backlight module according to claim 4, characterized in that: The outer surface of the lens layer is a curved surface with an arc line.

7. The high color gamut backlight module according to claim 6, characterized in that: The curved surface includes a first curved surface and a second curved surface, wherein the first curved surface is connected to the second curved surface to form a concave valley structure at the connection point.

8. The high color gamut backlight module according to claim 7, characterized in that: The curved surface further includes: a first vertical surface and a second vertical surface, wherein the first vertical surface is connected to the first arc surface, and the second vertical surface is connected to the second arc surface.

9. The high color gamut backlight module according to any one of claims 4 to 8, characterized in that: The lens layer covers the packaging structure and the fluorescent layer without any gap.

10. A display device, characterized in that: It comprises the high color gamut backlight module as described in any one of claims 1 to 9.

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