High-color-gamut backlight module and display equipment

Abstract

The utility model relates to the technical field of backlight display, and provides a high-color-gamut backlight module and display device.The backlight module comprises a substrate, a packaging structure, a fluorescent layer, a plurality of first light-emitting units and a plurality of second light-emitting units, and the first light-emitting units and the second light-emitting units are arranged at intervals; the 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 a light-proof 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; part of light excited by the first light-emitting units and the second light-emitting units enters the light mixing area, the other part of light enters the light reflecting area, the light entering the light reflecting area is reflected into the light mixing area to be mixed, and the mixed light is compensated by the fluorescent layer to form white light. The problem that in the prior art, in the display process, the mutual light mixing effect of the blue light chip and the green light chip is poor, color difference is likely to occur, and consequently the display color purity is not enough is solved.

Description

TECHNICAL FIELD

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

[0002] Light Emitting Diode (LED) is a kind of semiconductor diode, which can convert electrical energy into light energy. LED has low working voltage, small working current, good impact resistance and shock resistance, high reliability, long service life, and can easily modulate the intensity of light by modulating the intensity of the current. LED backlight technology is a kind of backlight technology using Light Emitting Diode (LED) as light source, which is widely used in liquid crystal display (LCD) and television screens.

[0003] In the existing LED backlight display scheme, a light source structure of blue chips and green chips arranged side by side can be used as a light source to excite white light. However, in this display scheme, the mutual mixing effect of blue chips and green chips is poor, color difference is easy to occur, and the color purity of display is not enough. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to provide a high color gamut backlight module and display device to solve the problem that in the prior art, a light source structure of blue chips and green chips arranged side by side is used as a light source to excite white light, but in this display scheme, the mutual mixing effect of blue chips and green chips is poor, color difference is easy to occur, and the color purity of display is not enough.

[0005] Therefore, in a 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 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 light mixing layer and a side wall, the side wall is a light-tight plate, and the light excited by the first light emitting units and the second light emitting units propagates outward from the light mixing layer; wherein the light mixing layer comprises a light reflection area and a light mixing area, the light reflection area is located at the edge of the light mixing layer, the light mixing area is located at the middle of the light mixing layer, the first light emitting units and the second light emitting units can excite light of different colors; a part of the light excited by the plurality of first light emitting units and second light emitting units enters the light mixing area, another part of the light enters the light reflection area, the light entering the light reflection area is reflected into the light mixing area for mixing, the mixed light is compensated by the fluorescent layer to form white light, and the first light emitting units and the second light emitting units are each provided with an arc lens layer.

[0006] The high color gamut backlight module provided in the above-mentioned scheme, the first light emitting units excite blue light, the second light emitting units excite green light, and the fluorescent layer excites red light.

[0007] The high color gamut backlight module provided in the scheme has the reflective area obliquely arranged at the edge of the light mixing layer and covering the light mixing area.

[0008] The high color gamut backlight module provided in the scheme further comprises a lens layer covering the packaging structure and the fluorescent layer.

[0009] The high color gamut backlight module provided in the scheme further comprises a diffusion layer covering the lens layer and a reflective layer covering the diffusion layer.

[0010] The high color gamut backlight module provided in the scheme has the outer surface of the lens layer in a curved surface with an arc.

[0011] The high color gamut backlight module provided in the scheme has the curved surface comprising a first arc surface and a second arc surface, the first arc surface being connected with the second arc surface to form a concave valley structure at the connection.

[0012] The high color gamut backlight module provided in the scheme has the curved surface further comprising a first vertical surface connected with the first arc surface and a second vertical surface connected with the second arc surface.

[0013] The high color gamut backlight module provided in the scheme has the lens layer covering the packaging structure and the fluorescent layer without gaps.

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

[0015] The high color gamut backlight module provided in the application has the following beneficial effects: the first light emitting units and the second light emitting units are arranged at intervals and are packaged by the packaging structure, the packaging structure comprises a light mixing layer and a side wall, the side wall is a lightproof plate, the light mixing layer is arranged above the first light emitting units and the second light emitting units, and the light emitted by the first light emitting units and the second light emitting units is propagated outward from the light mixing layer. The packaging structure can sufficiently mix the blue light and the green light, excite red light compensation through the fluorescent layer to form white light, improve the color gamut, reduce the color difference, and solve the technical problem that the display color purity is not enough in the prior art in which the light source structure of the blue light chip and the green light chip in parallel is used as a light source to excite white light. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort.

[0017] Fig. 1 A cross-sectional structure schematic diagram of a high color gamut backlight module provided by an embodiment of the present application;

[0018] Fig. 2 A cross-sectional structure schematic diagram of a packaging structure provided by an embodiment of the present application;

[0019] Fig. 3 A cross-sectional structure schematic diagram of another high color gamut backlight module provided by an embodiment of the present application;

[0020] Fig. 4 A shape structure schematic diagram of a lens layer provided by an embodiment of the present application;

[0021] Fig. 5 A structure schematic diagram of a first light emitting unit provided by an embodiment of the present application;

[0022] Fig. 6 A structure schematic diagram of a second light emitting unit provided by an embodiment of the present application.

[0023] In the drawings, various reference signs represent:

[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, light reflection area; 212, light mixing area; 2111, light reflection surface. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail below with reference to the 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" or "set" on another component, it can be directly or indirectly on the other component. When a component is referred to as being "connected" to another component, it can be directly or indirectly connected to the other component. The terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or position shown in the drawings based on the orientation or position shown in the drawings, and are only for the convenience of description, and cannot be understood as a limitation on the technical solutions. The terms "first", "second" are only for the convenience of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0027] CSP (Chip Scale Package) technology is an advanced semiconductor packaging technology that allows the packaged chip size to approach or equal the size of the bare chip, greatly reducing the volume of the package. CSP technology exhibits its unique advantages in many aspects. The development of CSP technology is of great significance to the progress of the semiconductor packaging industry, which not only improves the performance of electronic products, but also provides the possibility for designing smaller and more efficient electronic systems.

[0028] Light Emitting Diode (LED) is a kind of semiconductor diode, which can convert electrical energy into light energy. LED has low operating voltage, small operating current, good impact and shock resistance, high reliability, long service life, and can easily modulate the intensity of light by modulating the intensity of current. LED backlight technology is a backlight technology that uses Light Emitting Diodes (LEDs) as light sources, which is widely used in liquid crystal displays (LCDs) and television 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 realize the miniaturization of LED products.

[0030] In existing LED backlight display solutions, a light source structure of parallel blue chips and green chips can be used as a light source to excite white light, but in this display solution, the mutual light mixing effect of the blue chips and the green chips is poor, color difference is easy to occur, and the color purity of the display is not enough.

[0031] Therefore, the embodiment of the present application provides a high color gamut backlight module, which includes a blue chip and a green chip. Figs. 1-4As shown, the backlight module comprises a substrate 1, an encapsulation 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 the plurality of second light-emitting units 5 are arranged on the substrate 1 and located within the encapsulation structure 2; the fluorescent layer 3 covers the encapsulation structure 2; the encapsulation structure 2 comprises a light mixing layer 21 and a side wall 22, the side wall 22 is a light-tight plate, and the light emitted by the first light-emitting units 4 and the second light-emitting units 5 propagates outward from the light mixing layer 21; wherein the light mixing layer 21 comprises a light reflecting area 211 and a light mixing area 212, the light reflecting area 211 is located at the edge of the light mixing layer 21, and the light mixing area 212 is located at the middle of the light mixing layer 21; the first light-emitting units 4 and the second light-emitting units 5 can emit light of different colors; part of the light emitted by the plurality of first light-emitting units 4 and the plurality of second light-emitting units 5 enters the light mixing area 212, and the other part of the light enters the light reflecting area 211; the light entering the light reflecting area 211 is reflected into the light mixing area 212 to be mixed, the mixed light is compensated by the fluorescent layer 3 to form white light, and the first light-emitting units 4 and the second light-emitting units 5 are each provided with an arc lens layer 42.

[0032] Specifically, in the present scheme, the backlight module adopts a double-light-source excitation scheme, the light emitted by the first light-emitting units 4 and the second light-emitting units 5 is of different colors; in one example, the first light-emitting units 4 can emit blue light, and the second light-emitting units 5 can emit green light; in another example, the first light-emitting units 4 can emit green light, and the second light-emitting units 5 can emit blue light. Similarly, other different colors of light emitted by the first light-emitting units 4 and the second light-emitting units 5 can be selected according to the setting needs, which is not limited in the present application.

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

[0034] Outside the plurality of first light-emitting units 4 and the plurality of second light-emitting units 5, the encapsulation structure 2 is provided, and the encapsulation structure 2 encapsulates the plurality of first light-emitting units 4 and the plurality of second light-emitting units 5. The encapsulation structure 2 comprises a light mixing layer 21 and a side wall 22, the side wall 22 is a light-tight plate, and surrounds the plurality of first light-emitting units 4 and the plurality of second light-emitting units 5. The light-tight side wall 22 is provided to make the light of the plurality of first light-emitting units 4 and the plurality of second light-emitting units 5 enter the light mixing layer 21 and propagate outward from the light mixing layer 21.

[0035] In one embodiment, the light mixing layer 21 comprises two regions, i.e. a light reflecting region 211 and a light mixing region 212. The light reflecting region 211 is located at the edge of the light mixing layer 21, and the light mixing region 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. Part of the light excited by the first light emitting unit 4 and the second light emitting unit 5 enters the light mixing region 212, and the other part of the light enters the light reflecting region 211. The light entering the light reflecting region 211 is reflected into the light mixing region 212, and the mixed light is compensated by the fluorescent layer 3 to form white light.

[0036] Specifically, in the present embodiment, the light mixing region 212 and the light reflecting region 211 can be arranged on the same horizontal layer. The light reflecting region 211 is arranged at the edge of the horizontal layer, and the light mixing region 212 is arranged in the middle of the horizontal layer. The light reflecting region 211 has a light reflecting surface 2111, i.e. the connecting surface between the light reflecting region 211 and the light mixing region 212. The light reflecting surface 2111 is arranged obliquely and faces the light mixing region 212. The light projected from the light mixing region 212 can be reflected by the light reflecting layer into the light mixing region 212, and the reflected light enters the light mixing region 212 from the light reflecting surface 2111 and mixes with the light in the light mixing region 212 again. The cross section of the light mixing region 212 can be in the shape of a trapezoid. The lower base of the trapezoid can be the bottom surface of the light mixing layer 21 (or part of the bottom surface of the light mixing layer 21), and the upper base of the trapezoid is part of the top surface of the light mixing layer 21. The reflecting region can be arranged along the waist line of the trapezoid, and the light mixing region 212 and the light reflecting region 211 form a light mixing layer 21 with a rectangular cross section.

[0037] Taking the adjacent first light emitting unit 4 and the second light emitting unit 5 as an example, the first light emitting unit 4 and the second light emitting unit 5 emit light by the driving of the light emitting circuit. 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 directly or by reflection enter the light mixing layer 21. 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 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 unmixed light enters the light mixing layer 21 from the edge of the light mixing layer 21. After the unmixed light enters the light mixing layer 21 from the edge, it is reflected by the light reflecting region 211 arranged at the edge of the light mixing layer 21 to the light mixing region 212, and is fully mixed with the partially mixed light in the light mixing region 212. The mixed light is then transmitted outward through the top surface of the light mixing layer 21. In the present embodiment, the light emitted by the first light emitting unit 4 and the second light emitting unit 5 is fully mixed, which improves the color gamut and reduces the color difference.

[0038] In an embodiment, the fluorescent layer 3 is arranged outside the light mixing layer 21, and the fluorescent layer 3 can be arranged on 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 the embodiment, the fluorescent layer 3 is provided with red fluorescent powder, and red light can be excited. The blue light and green light excited by the first light emitting unit 4 and the second light emitting unit 5 are mixed sufficiently, and white light is formed by compensation of the fluorescent layer 3, which improves the color gamut and reduces the color difference.

[0039] Compared with the prior art, the first light emitting unit 4 and the second light emitting unit 5 are arranged at intervals and are packaged by the packaging structure 2. The packaging structure 2 includes the light mixing layer 21 and the side wall 22. The side wall 22 is a lightproof plate. The light mixing layer 21 is arranged above the first light emitting unit 4 and the second light emitting unit 5. The light excited by the first light emitting unit 4 and the second light emitting unit 5 is transmitted from the light mixing layer 21. The packaging structure 2 can make the blue light and the green light mix sufficiently. The white light is formed by compensation of the fluorescent layer 3. The color gamut is improved, and the color difference is reduced. The technical problem that the color purity of the display is not enough is solved in the prior art, in which the light source structure of the blue light chip and the green light chip in parallel is used as a light source to excite white light. However, the mutual light mixing effect of the blue light chip and the green light chip is poor in the display scheme, and the color difference is prone to occur.

[0040] In an embodiment, the reflective area 211 is arranged at an edge of the light mixing layer 21 and covers the light mixing area 212.

[0041] Specifically, in the embodiment, the reflective area 211 is arranged at the edge of the light mixing layer 21, that is, the reflective area 211 and the light mixing area 212 have an included angle, and the reflective area 211 covers the light mixing area 212. The reflective area 211 arranged at an angle is beneficial to reflecting the light entering the edge of the light mixing layer 21. The light entering the edge of the light mixing layer 21 can be reflected 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 is mixed sufficiently. The propagation path of the light in the mixing layer is very complex, including multiple reflections and refractions. Covering the reflective area 211 on the light mixing area 212 is beneficial to the sufficient mixing of the light.

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

[0043] Specifically, in the embodiment, the lens layer 6 is arranged around the packaging structure 2 and the fluorescent layer 3. The lens layer 6 can completely cover 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. The shape of the lens layer 6 can be reasonably arranged according to the light diffusion effect. In an example, the lens layer 6 can be arranged around the packaging structure 2 and the fluorescent layer 3 without gaps.

[0044] In an embodiment, the backlight module further comprises a diffusion layer 7 covering the lens layer 6, and a reflection layer 8 covering the diffusion layer 7.

[0045] Specifically, in the embodiment, the backlight module comprises the diffusion layer 7 and the reflection layer 8 in addition to the lens layer 6, 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 generally 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 generally located in 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, the light is reflected to the light mixing area 212 by the reflection area 211 arranged at the edge of the light mixing layer 21, and is fully mixed with the partially mixed light in the light mixing area 212. After the mixing, the light is compensated to form white light by the fluorescent layer 3, and the white light transmits through the lens layer 6, the diffusion layer 7 and the reflection layer 8 to propagate outward, which can improve the color gamut and reduce the color difference.

[0046] In an embodiment, the outer surface of the lens layer 6 is a curved surface with an arc line. The curved surface comprises a first arc surface 61 and a second arc surface 63, the first arc surface 61 is connected with the second arc surface 63, and a concave valley structure 62 is formed at the connection. The curved surface further comprises a first vertical surface 64 and a second vertical surface 65, the first vertical surface 64 is connected with the first arc surface 61, and the second vertical surface 65 is connected with the second arc surface 63.

[0047] Specifically, in the embodiment, the outer surface of the lens layer 6 comprises the first arc surface 61 and the second arc surface 63, the first arc surface 61 and the second arc surface 63 can be integrally formed, and the surfaces of the first arc surface 61 and the second arc surface 63 can be arranged in a circular arc shape. Therefore, the first arc surface 61 and the second arc surface 63 are connected to form the concave valley structure 62, and the packaging structure 2 where the first light-emitting unit 4 and the second light-emitting unit 5 are located is arranged at the middle position of the concave valley 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 by the first arc surface 61 and the second arc surface 63, and the backlight module has a larger light-emitting angle.

[0048] In an embodiment, the lens layer 6 covers the packaging structure 2 and the fluorescent layer 3 without gaps.

[0049] Specifically, in the embodiment, the lens layer 6 covers the packaging structure 2 and the fluorescent layer 3 without gaps, and the lens layer 6 is combined with the packaging structure 2 and the fluorescent layer 3 without gaps, 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, a half-angle of a direction can be more than 160 degrees, and uniform diffusion of light is facilitated.

[0050] In an 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 four sides of the first LED chip 41. The curved lens layer 42 can diffuse the light emitted by the first LED chip 41 once, so that the light emitted by the first LED chip 41 can be more uniformly diffused.

[0051] Specifically, in the embodiment, the first LED chip 41 can be a blue light chip as described above, and the curved lens layer 42 is packaged 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 cover the four sides of the first LED chip 41 without gaps.

[0052] Part of the light emitted from the front of the first LED chip 41 is refracted and diffused outward through the curved lens layer 42 and enters the packaging structure 2, and another 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 uniformly diffused outward.

[0053] In an 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 four sides of the second LED chip 51. The curved lens layer 42 can diffuse the light emitted by the second LED chip 51 once, so that the light emitted by the second LED chip 51 can be more uniformly diffused.

[0054] Specifically, in the embodiment, the second LED chip 51 can be a green light chip as described above, and the curved lens layer 42 is packaged 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 cover the four sides of the second LED chip 51 without gaps.

[0055] Part of the light emitted from the front of the second LED chip 51 is refracted and diffused outward through the curved lens layer 42 and enters the packaging structure 2, and 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 uniformly diffused outward.

[0056] In an embodiment, the first light emitting unit 4 and the second light emitting unit 5 can be arranged in a spaced manner or in a contact manner, and 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 of different structures.

[0057] The high color gamut backlight module provided by the embodiment of the present application comprises 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 in a spaced manner; 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 is arranged above the packaging structure 2; the packaging structure 2 comprises a light mixing layer 21 and a side wall 22, and the side wall 22 is a lightproof plate; wherein the light mixing layer 21 comprises a light reflecting area 211 and a light mixing area 212, the light reflecting area 211 is located at the edge of the light mixing layer 21, and the light mixing area 212 is located at the middle part 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 light reflecting area 211; the light entering the light reflecting area 211 is reflected into the light mixing area 212 to be mixed, and the mixed light is compensated by the fluorescent layer 3 to form white light. The problem that the mutual light mixing effect of the blue light chip and the green light chip is poor in the prior art, and color difference is prone to occur to cause insufficient display color purity is solved.

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

[0059] Specifically, in the embodiment, the display device can comprise a housing and a high color gamut backlight module, and the high color gamut backlight module is fixedly arranged on the housing. Wherein, the high color gamut backlight module comprises 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 in a spaced manner; 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 is arranged above the packaging structure 2; the packaging structure 2 comprises a light mixing layer 21 and a side wall 22, and the side wall 22 is a lightproof plate, and the light excited by the first light emitting unit 4 and the second light emitting unit 5 is propagated outward from the light mixing layer 21; wherein the light mixing layer 21 comprises a light reflecting area 211 and a light mixing area 212, the light reflecting area 211 is located at the edge of the light mixing layer 21, and the light mixing area 212 is located at the middle part 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 second light emitting units 5 enters the light mixing area 212, and another part of the light enters the light reflecting area 211; the light entering the light reflecting area 211 is reflected into the light mixing area 212 to be mixed, and the mixed light is compensated by the fluorescent layer 3 to form white light.

[0060] The backlight module can adopt a double light source excitation scheme. The first light emitting unit 4 and the second light emitting unit 5 excite light of different colors. 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, other different colors of light excited by the first light emitting unit 4 and the second light emitting unit 5 can be selected according to the setting requirements, which is not limited in the present application.

[0061] The substrate 1 is provided with a light emitting circuit, 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 flip-chip technology 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. The multiple first light emitting units 4 are arranged at intervals to improve the light mixing effect of adjacent first light emitting units 4 and second light emitting units 5.

[0062] Outside the multiple first light emitting units 4 and the multiple second light emitting units 5, a packaging structure 2 is provided, which encapsulates the multiple first light emitting units 4 and the multiple second light emitting units 5. The packaging structure 2 includes a light mixing layer 21 and a side wall 22. The side wall 22 is a light-tight plate surrounding the multiple first light emitting units 4 and the multiple second light emitting units 5. The light-tight side wall 22 is provided to make the light of the multiple first light emitting units 4 and the multiple second light emitting units 5 enter the light mixing layer 21 and propagate outward from the light mixing layer 21.

[0063] The light mixing layer 21 can include two regions, i.e., a light reflecting region 211 and a light mixing region 212. The light reflecting region 211 is located at the edge of the light mixing layer 21, and the light mixing region 212 is located at 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. Part of the light excited by the multiple first light emitting units 4 and the multiple second light emitting units 5 enters the light mixing region 212, and the other part enters the light reflecting region 211. The light entering the light reflecting region 211 is reflected into the light mixing region 212 for mixing. 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 can be arranged on the same horizontal layer. The light reflecting area 211 is arranged on 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, i.e. 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 to the light mixing area 212, and the reflected light enters the light mixing area 212 from the light reflecting surface 2111 and mixes with the light in the light mixing area 212 again. The cross section of the light mixing area 212 can be in the shape of a trapezoid, the lower base of the trapezoid can be the bottom surface of the light mixing layer 21 (or a part of the bottom surface of the light mixing layer 21), and the upper base of the trapezoid is a part of the top surface of the light mixing layer 21. The reflecting area can be arranged along the waist line of the trapezoid, and the light mixing area 212 forms a light mixing layer 21 with 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 light not mixed directly or after being reflected enters the light mixing layer 21. 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 light not mixed is usually located in 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 light not mixed enters the light mixing layer 21 from the edge of the light mixing layer 21. After the light not mixed enters the light mixing layer 21 from the edge, it is reflected by the light reflecting area 211 arranged at the edge of the light mixing layer 21 to the light mixing area 212, and is fully mixed with the light partially mixed in the light mixing area 212. After the mixing, the light is transmitted outwards through the top surface of the light 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 improves the color gamut and reduces the color difference.

[0066] The fluorescent layer 3 is arranged outside the light mixing layer 21. The fluorescent layer 3 can be arranged on the light mixing layer 21, and the light transmitted from the light mixing layer 21 can form white light after passing through the fluorescent layer 3. In this embodiment, the fluorescent layer 3 is provided with red fluorescent powder, which can 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 the compensation of the fluorescent layer 3, which improves the color gamut and reduces the color difference.

[0067] The light reflection area 211 is arranged obliquely on the edge of the light mixing layer 21 and covers the light mixing area 212. The light reflection area 211 is arranged obliquely on the light mixing layer 21, that is, the light reflection area 211 and the light mixing area 212 have an included angle, and the light reflection area 211 covers the light mixing area 212. The obliquely arranged light reflection area 211 is beneficial 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 is fully mixed. The propagation path of the light in the mixing layer is very complex, including multiple reflections and refractions, etc. Covering the light reflection area 211 on the light mixing area 212 is beneficial to the full mixing of the light.

[0068] The backlight module further includes a lens layer 6, which is wrapped around the packaging structure 2 and the fluorescent layer 3. The lens layer 6 is wrapped outside the packaging structure 2 and the fluorescent layer 3, and can be completely wrapped around 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 wrapped around the packaging structure 2 and the fluorescent layer 3 without gaps.

[0069] In an 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. In addition to the lens layer 6, the backlight module further includes the diffusion layer 7 and the reflection layer 8, 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 un-mixed 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 un-mixed light enters the light mixing layer 21 from the edge of the light mixing layer 21. After the partially un-mixed light enters the light mixing layer 21 from the edge, it is reflected by the light reflection area 211 arranged at the edge of the light mixing layer 21 to the light mixing area 212, and fully mixed with the partially mixed light in the light mixing area 212. After mixing, the light passes through the fluorescent layer 3 to form white light, and the white light is propagated outward through the lens layer 6, the diffusion layer 7 and the reflection layer 8, which can improve the color gamut and reduce the color difference.

[0070] The outer surface of the lens layer 6 is a curved surface with an arc. The curved surface includes a first arc surface 61 and a second arc surface 63, the first arc surface 61 is connected with the second arc surface 63, and a concave valley structure 62 is formed at the connection. The curved surface further includes a first vertical surface 64 and a second vertical surface 65, the first vertical surface 64 is connected with the first arc surface 61, and the second vertical surface 65 is connected with the second arc surface 63.

[0071] The outer surface of the lens layer 6 comprises a first arc surface 61 and a second arc surface 63, which can be integrally formed and have a circular arc shape, so that the first arc surface 61 and the second arc surface 63 are connected to form a concave valley structure 62, and the packaging structure 2 where the first light emitting unit 4 and the second light emitting unit 5 are located is arranged at the middle position of the concave valley structure 62. The lens layer 6 forms two convex lens structures on both sides of the packaging structure 2, so that the light beam angles of the first light emitting unit 4 and the second light emitting unit 5 can be further opened through the first arc surface 61 and the second arc surface 63, and 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 combined with the packaging structure 2 and the fluorescent layer 3 without gaps, 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 a half strong angle in one direction can be more than 160 degrees, which is beneficial to uniform diffusion of light.

[0073] The first light emitting unit 4 comprises a first LED chip 41 and an arc lens layer 42. The arc lens layer 42 covers the four sides of the first LED chip 41. The arc lens layer 42 can diffuse the light excited by the first LED chip 41 once, so that the light excited by the first LED chip 41 can be more uniformly diffused.

[0074] The first LED chip 41 can be a blue light chip, and the arc lens layer 42 is packaged by CSP packaging technology. The shape of the arc lens layer 42 can be reasonably set according to the light diffusion effect. The arc lens layer 42 can also cover the four sides of the first LED chip 41 without gaps.

[0075] A part of the light emitted from the front of the first LED chip 41 is refracted, passes through the arc lens layer 42 and diffuses outward into the packaging structure 2, and the other part of the light is refracted and emitted from the side of the first LED chip 41. After multiple refraction and reflection, the light emitted by the first LED chip 41 is uniformly diffused outward.

[0076] The second light emitting unit 5 comprises a second LED chip 51 and an arc lens layer 42. The arc lens layer 42 covers the four sides of the second LED chip 51. The arc lens layer 42 can diffuse the light excited by the second LED chip 51 once, so that the light excited by the second LED chip 51 can be more uniformly diffused.

[0077] The second LED chip 51 can be the green light chip described above, and the arc lens layer 42 is packaged by the CSP packaging technology. The shape of the arc lens layer 42 can be reasonably set according to the light diffusion effect. The arc lens layer 42 can also be gaplessly wrapped around the second LED chip 51.

[0078] Part of the light emitted from the front of the second LED chip 51 is refracted, passes through the arc lens layer 42, and is diffused outward to enter the packaging structure 2; and the other part of the light is refracted and emitted from the side of the second LED chip 51. After multiple refraction and reflection, the light emitted by the second LED chip 51 is uniformly diffused outward.

[0079] The first light emitting unit 4 and the second light emitting unit 5 can be arranged in a spaced manner or in a contact manner, and 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 of different structures.

[0080] The display device provided in the present application arranges a plurality of first light emitting units 4 and a plurality of second light emitting units 5 in a spaced manner and packages them by the packaging structure 2. The packaging structure 2 can fully mix the blue light and the green light, excite the red light compensation through the fluorescent layer 3 to form white light, improve the color gamut, reduce the color difference, and solve the technical problem that the color purity of the display is not enough in the prior art, that is, the light source structure of the blue light chip and the green light chip in parallel is used as a light source to excite white light. However, in this display scheme, the mutual light mixing effect of the blue light chip and the green light chip is poor, and color difference is prone to occur.

[0081] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high color gamut backlight module, characterized in that, include: The substrate, the encapsulation structure, the phosphor layer, and a plurality of spaced-apart first light-emitting units and second light-emitting units; A plurality of the first light-emitting units and the second light-emitting units are disposed on the substrate and located within the encapsulation structure; the fluorescent layer covers the encapsulation structure. The encapsulation structure includes a light mixing layer and a sidewall, wherein the sidewall is an opaque plate, and the light excited by the first light-emitting unit and the second light-emitting unit propagates outward from the light mixing layer. The light mixing layer includes 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. The first light-emitting unit and the second light-emitting unit can excite light of different colors. A portion of the light excited by the multiple 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. The light entering the reflective area is reflected into the light mixing area and mixed. The mixed light is compensated by the fluorescent layer to form white light. Both the first light-emitting unit and the second light-emitting unit are provided with a curved lens layer.

2. The high gamut backlight module of claim 1, wherein, 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 gamut backlight module of claim 1, wherein, The reflective area is inclinedly disposed at the edge of the light mixing layer and covers the light mixing area.

4. The high gamut backlight module of claim 1, wherein, It also includes a lens layer that covers the encapsulation structure and the phosphor layer.

5. The high gamut backlight module of claim 4, wherein, Also includes: A diffusion layer covers the lens layer. A reflective layer is placed over the diffusion layer.

6. The high gamut backlight module of claim 4, wherein, The outer surface of the lens layer is a curved surface with an arc.

7. The high gamut backlight module of claim 6, wherein, The curved surface includes a first arc surface and a second arc surface, with the first arc surface connected to the second arc surface, forming a concave trough structure at the connection point.

8. The high gamut backlight module of claim 7, wherein, 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 gamut backlight module of any of claims 4-8, wherein, The lens layer seamlessly covers the encapsulation structure and the fluorescent layer.

10. A display device, characterized by comprising: Including the high color gamut backlight module as described in any one of claims 1-9.

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