A quantum dot LED light bar and backlight module suitable for high color gamut backlight module

Abstract

The present invention discloses a quantum dot LED light bar and a backlight module suitable for a high color gamut backlight module, the quantum dot LED light bar comprises: a quantum diaphragm, a blue light LED chip, a fixed top block, a substrate and a thermal conductive tape; wherein a plurality of the fixed top blocks are arranged in a straight line at a preset distance, and are all printed and welded on the upper surface of the substrate; a plurality of the blue light LED chips are located between any two adjacent fixed top blocks, and are printed and welded on the upper surface of the substrate; the quantum diaphragm is fully attached to the plurality of fixed top blocks; the thermal conductive tape is attached to the lower surface of the substrate. The quantum dot LED light bar can save costs by using a smaller area of ​​quantum diaphragms, and the backlight module only needs to use ordinary optical diaphragms to achieve the improved color gamut requirements. On the other hand, it enhances the color gamut effect of televisions and monitors to achieve high saturation and high definition quality of the displayed image, and is highly practical.

Description

Technical Field

[0001] The present invention relates to the technical field of backlight display terminals, and in particular to a quantum dot LED light bar and a backlight module suitable for a high color gamut backlight module. Background Art

[0002] In recent years, quantum dot TVs have been selling very well in the market, and major domestic TV manufacturers have mass-produced them. The price of large-size, high-color gamut quantum dot TVs has gradually dropped from tens of thousands of yuan to a few thousand yuan. Product profits are getting thinner and thinner, material costs and labor costs are constantly rising, and profit margins are getting smaller and smaller. Many companies are engaging in price wars to grab customers. Fierce price competition and disordered industry ecological chains have prompted the industry to continuously demand new design solutions to solve the current difficulties. The backlight module in the existing technology, when used in the terminal display field, has the following technical problems: high cost and many assembly processes.

[0003] Existing conventional high color gamut modules generally use quantum dot films to improve the color gamut. The cost of this film is more than three times that of ordinary films. The original quantum film has a barrier film added to block water and oxygen. The film will greatly reduce the degree of the module, and its quantum blue light ratio will be lost by 10%.

[0004] Therefore, how to solve the high cost, multiple assembly processes and light source loss of existing backlight modules has become an urgent problem that practitioners in the same field need to solve. Summary of the invention

[0005] In order to overcome the deficiencies in the prior art, the present invention provides a quantum dot LED light bar and a backlight module suitable for a high color gamut backlight module. The LED light bar has no light source loss at all and can improve the utilization rate of the light source; it can solve the problems of high cost, multiple assembly steps and light source loss of the above-mentioned backlight module.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a quantum dot LED light bar suitable for a high color gamut backlight module, comprising: a quantum diaphragm, a blue LED chip, a fixed top block, a substrate and a thermal conductive tape;

[0008] Wherein, the plurality of fixed top blocks are arranged in a straight line at a preset distance, and are all printed and welded on the upper surface of the substrate; the plurality of blue light LED chips are located between any two adjacent fixed top blocks, and are printed and welded on the upper surface of the substrate;

[0009] The quantum membrane is completely attached to the plurality of fixed top blocks; the thermal conductive tape is attached to the lower surface of the substrate.

[0010] Furthermore, the quantum membrane is a quantum dot laminated membrane with a high color gamut; the width of the quantum membrane is the same as the width of the substrate.

[0011] Furthermore, the quantum membrane is fully bonded to the fixed top block by optical adhesive.

[0012] Furthermore, the fixed top block is made of FR4 material and is tin-plated on both sides.

[0013] Furthermore, the height of the fixed top block is greater than the height of the blue LED chip.

[0014] Furthermore, the substrate is made of metal aluminum, copper, alloy, glass or ceramic.

[0015] In a second aspect, the present invention further provides a backlight module suitable for a high color gamut, comprising: a reflector, a quantum dot LED light bar, a light guide plate, an optical film, and a middle frame; the quantum dot LED light bar is a quantum dot LED light bar provided in any one of the above embodiments;

[0016] The reflective sheet, a plurality of quantum dot LED light strips, a light guide plate and an optical film are sequentially stacked and assembled in the middle frame.

[0017] In a third aspect, the present invention provides a quantum dot LED light bar suitable for a high color gamut backlight module, comprising: a quantum film, a white light patch LED lamp bead, a fixed top block, a substrate and a thermal conductive tape;

[0018] Among them, the plurality of fixed top blocks are arranged in a straight line at a preset distance, and are all printed and welded on the upper surface of the substrate; the plurality of white light SMD LED lamp beads are located between any two adjacent fixed top blocks, and are printed and welded on the upper surface of the substrate;

[0019] The quantum membrane is completely attached to the plurality of fixed top blocks; the thermal conductive tape is attached to the lower surface of the substrate.

[0020] In a fourth aspect, the present invention further provides a backlight module suitable for a high color gamut, comprising: a reflector, a quantum dot LED light bar and a middle frame; the quantum dot LED light bar is the quantum dot LED light bar provided in the above embodiment;

[0021] Wherein, the reflective sheet and a plurality of quantum dot LED light strips are assembled in the middle frame.

[0022] The present invention provides a quantum dot LED light bar suitable for a high color gamut backlight module, which has the following beneficial effects:

[0023] 1) When used in backlight modules, the cost can be saved by about 25% to 30%. Conventional backlight modules require a large quantum film to achieve the effect of improving the color gamut. The quantum dot LED light strip can save costs by using a smaller area of ​​quantum film. The backlight module only needs to use an ordinary optical film to achieve the improved color gamut requirements.

[0024] 2) Improve the color gamut of TVs and monitors to achieve high saturation and high definition quality of the displayed images, which is highly practical.

[0025] The present invention discloses a backlight module suitable for high color gamut, which uses the above-mentioned quantum dot LED light strip. Instead of using a whole high color gamut quantum film on the backlight module of a monitor or a television, it only needs to be composed of multiple quantum dot LED light strips, which greatly reduces the cost of the backlight module and achieves the level of improving the color gamut.

[0026] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The objectives and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0027] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 The overall structure diagram of the quantum dot LED light bar suitable for a high color gamut backlight module provided by an embodiment of the present invention;

[0030] Figure 2 A side structural diagram of a quantum dot LED light bar suitable for a high color gamut backlight module provided by an embodiment of the present invention;

[0031] Figure 3 A three-dimensional structural diagram of a quantum dot LED light bar suitable for a high color gamut backlight module provided in an embodiment of the present invention;

[0032] Figure 4 This is an exploded schematic diagram of a high color gamut backlight module according to Embodiment 2;

[0033] Figure 5 This is an exploded schematic diagram of a high color gamut backlight module according to Embodiment 4;

[0034] In the attached figure:

[0035] 1-quantum dot diaphragm, 2-blue light LED chip, 3-fixed top block, 4-substrate, 5-thermal conductive tape, 6-connector, 11-reflector, 12-quantum dot LED light strip, 13-light guide plate, 14-optical diaphragm, 15-middle frame. DETAILED DESCRIPTION

[0036] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0037] Embodiment 1:

[0038] The invention provides a quantum dot LED light bar suitable for a high color gamut backlight module, referring to Figure 1-3 As shown, it includes: a quantum film 1, a blue LED chip 2, a fixed top block 3, a substrate 4 and a thermal conductive tape 5. The quantum dot LED light bar is in a strip shape, and has a connector 6 at one end. A plurality of fixed top blocks 3 are arranged in a straight line at a certain distance (equidistant or unequal), and are all printed and welded on the upper surface of the substrate 4; a plurality of indefinite numbers of blue LED chips 2 are located between any two adjacent fixed top blocks 3, and are printed and welded on the upper surface of the substrate 4. The blue LED chip 2 and the fixed top block 3 are printed on the substrate 4 using an SMT printer.

[0039] The quantum membrane 1 is completely attached to all the above-mentioned fixed top blocks 3. The fixed top blocks 3 play a supporting role. The height of the fixed top blocks 3 is greater than the height of the blue light LED chip 2, which can prevent the quantum membrane from directly contacting the blue light LED chip and affecting the light divergence; and reduce the heat generated by the blue light LED chip directly transferred to the quantum membrane 1. The lower surface of the substrate 4 is pasted with a thermal conductive tape 5, which has the characteristics of high thermal conductivity and insulation, and has softness, compressibility, compliance, and strong adhesion. It can tightly and firmly fix the light bar to the back plate of the backlight module and quickly conduct the heat away.

[0040] Among them, the number of the above-mentioned fixed top blocks, the distance between adjacent fixed top blocks, the number of blue light LED chips and the distance between them are all related to the environment in which the quantum dot LED light strip is ultimately used and the applicable products. Corresponding choices can be made based on relevant designs, and the embodiments of the present disclosure do not limit this.

[0041] The above-mentioned quantum membrane 1 is a quantum dot pressed membrane for high color gamut, and its width is the same as that of the substrate 4. This membrane and the light-enhancing prism sheet are used together to improve the color gamut. The quantum membrane 1 can be fully bonded to the fixed top block 3 with optical glue. The fixed top block is made of FR4 material and is tin-plated on both sides. The tin plating facilitates welding.

[0042] Furthermore, the material of the substrate can be metal aluminum, copper, alloy, glass or ceramic, etc. When the substrate is an aluminum (copper) PCB board, it is convenient to improve the heat dissipation function, specifically a metal-based aluminum (copper) board made of a metal sheet, an insulating dielectric layer and an aluminum foil (copper foil). Other alloy materials with higher strength can also be selected according to the use environment of the product, such as Invar alloy, Kovar alloy, W, Mo, Al, Cu, etc.

[0043] In addition, the above-mentioned substrate can also be made of glass or ceramic material, and the printed circuit has good solderability when used as a substrate. For example, transparent glass or transparent ceramic can be selected, which has good light transmittance. For example: for transparent glass, the light directed toward the circuit directly passes through the transparent glass circuit substrate, and there is no problem of light being absorbed by the circuit board and converted into heat to generate heat, which reduces the chip temperature and improves the chip's luminous efficiency. For the ceramic circuit substrate, since the thermal conductivity of ceramics is about 20W / mK, which is much higher than the thermal conductivity of aluminum-based and copper-based circuit boards of about 2.0W / mK, it has good thermal conductivity, can well eliminate the heat island effect, and improve the chip's luminous efficiency.

[0044] The quantum dot LED light bar suitable for a high color gamut backlight module provided in this embodiment has a relatively simple production process. The specific production steps are taken as an example of an aluminum-based PCB board:

[0045] (1) Place the PCB board into the printer to print solder paste;

[0046] (2) Use SMT placement machine to mount blue LED chips and fix top blocks;

[0047] (3) Place the PCB board with the blue LED chip in the reflow oven;

[0048] (4) Attach the quantum film to the front of the PCB board and attach it to the fixed top block;

[0049] (5) Apply thermal conductive tape to the back of the PCB.

[0050] Then, it can be packaged and shipped. The manufacturing process of the quantum dot LED light bar is relatively simple, and it is highly practical when applied to the backlight module. The blue LED chip 2 can be a front mounted chip or a flip mounted chip, and the embodiment of the present invention does not limit this.

[0051] The quantum dot LED light strip suitable for a high color gamut backlight module provided in the embodiment of the present invention has a quantum diaphragm bonded together with the LED light strip as a finished product. When used in a monitor or a television, a quantum diaphragm is added to each LED light strip, and there is no need to use a whole high color gamut quantum diaphragm on the backlight module of the monitor or television. Only a high color gamut quantum diaphragm with the same width as the light strip PCB needs to be added to one light strip, which can save a whole quantum diaphragm and reduce the cost of the entire backlight module by about 25% to 30%, while achieving the level of improving the color gamut.

[0052] Embodiment 2:

[0053] The present invention also provides a backlight module suitable for high color gamut, referring to Figure 4 As shown, it includes: a reflector 11, a quantum dot LED light bar 12, a light guide plate 13, an optical film 14 and a middle frame 15. Among them, the quantum dot LED light bar 12 is the quantum dot LED light bar of the above-mentioned embodiment 1. The reflector 11, multiple quantum dot LED light bars 12, the light guide plate 13 and the optical film 14 are sequentially stacked and assembled in the middle frame 15.

[0054] The reflective sheet 11 is assembled at the bottom and is made of white material with high reflectivity. Its function is to effectively reflect light to the front, thereby reflecting a point light source to the front to become a surface light source.

[0055] The light guide plate 13 is a PMMA printed light guide plate, which plays a role in improving the brightness of the backlight module. The optical film 14 is assembled on the light guide plate 13. The middle frame 15 plays a role in fixing the entire backlight module.

[0056] The quantum dot LED light strip 12 provides light source for the entire backlight, and the blue light emitted by the blue LED chip is coupled with the light guide plate 13 of the quantum dot, and then white light is emitted through the optical film 14, making the TV color more saturated and the picture more realistic.

[0057] When assembling the backlight module, follow the steps below: Figure 4 The light guide plate 13 is optically coupled with the blue LED light bar 12 to emit pure white light, which is converted from a point light source to a surface light source, and then combined with the optical film 14 to emit pure white light with high brightness and high color gamut, so that the TV and display can achieve the function of high color gamut.

[0058] Embodiment 3:

[0059] The present invention further provides a quantum dot LED light bar suitable for a high color gamut backlight module, which is different from Example 1 in that the blue light LED chip 2 is replaced with a white light SMD LED lamp bead. The same technical effect as Example 1 can be achieved, and other matters not covered are the same as Example 1 and will not be repeated.

[0060] Embodiment 4:

[0061] The present invention further provides a backlight module suitable for high color gamut, which is different from the second embodiment. Figure 5 As shown, it only includes: a reflector 11, a quantum dot LED light bar 12 and a middle frame 15. Among them, the quantum dot LED light bar 12 is the quantum dot LED light bar of the above-mentioned embodiment 3. Because the quantum dot LED light bar uses white light chip LED lamp beads, it can directly emit white light without the need for a light guide plate and an optical film; it further saves costs, simplifies the structure, and makes the production process steps simpler.

[0062] The reflective sheet 11 and the plurality of quantum dot LED light strips 12 are directly assembled in the middle frame 15 , and the middle frame 15 serves to fix the entire backlight module.

[0063] The reflective sheet 11 is assembled at the bottom and is made of white material with high reflectivity. Its function is to effectively reflect light to the front, thereby reflecting a point light source to the front to become a surface light source.

[0064] The quantum dot LED light strip 12 provides light source for the entire backlight. The white light patch LED lamp beads in the quantum dot LED light strip directly emit white light, making the TV color more saturated and the picture more realistic.

[0065] When assembling the backlight module, follow the steps below: Figure 5 The reflector 11 converts the white light emitted by the quantum dot LED light bar 12 from a point light source to a surface light source, emitting pure white light with high brightness and high color gamut, so that the TV and monitor can achieve the function of high color gamut.

[0066] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A quantum dot LED light bar suitable for a high color gamut backlight module, characterized in that: include: A quantum membrane (1), a blue light LED chip (2), a fixed top block (3), a substrate (4) and a thermal conductive tape (5); The plurality of fixed top blocks (3) are arranged in a straight line at a preset distance and are all printed and soldered on the upper surface of the substrate (4); the plurality of blue LED chips (2) are located between any two adjacent fixed top blocks (3) and are printed and soldered on the upper surface of the substrate (4); The fixed top block (3) is made of FR4 material and is tin-plated on both sides; The height of the fixed top block (3) is greater than the height of the blue LED chip (2); The quantum membrane (1) is completely attached to the plurality of fixed top blocks (3); the thermal conductive tape (5) is attached to the lower surface of the substrate (4); The quantum membrane is bonded together with an LED light bar formed by a plurality of the blue light LED chips (2) to form a finished product. When used in a monitor or a television, a quantum membrane is added to each LED light bar, and there is no need to use a whole high color gamut quantum membrane on the backlight module of the monitor or the television. Instead, only a high color gamut quantum membrane with the same width as the light bar PCB needs to be added to one light bar.

2. A quantum dot LED light bar suitable for a high color gamut backlight module as claimed in claim 1, characterized in that: The quantum membrane (1) is a quantum dot laminated membrane with a high color gamut; the width of the quantum membrane (1) is the same as the width of the substrate (4).

3. A quantum dot LED light bar suitable for a high color gamut backlight module as claimed in claim 2, characterized in that: The quantum membrane (1) is fully bonded to the fixed top block (3) by optical adhesive.

4. The quantum dot LED light bar suitable for a high color gamut backlight module according to claim 1, characterized in that: The substrate (4) is made of metal aluminum, copper, alloy, glass or ceramic.

5. A backlight module suitable for high color gamut, characterized in that: include: A reflective sheet (11), a quantum dot LED light bar (12), a light guide plate (13), an optical film (14) and a middle frame (15); the quantum dot LED light bar (12) is a quantum dot LED light bar according to any one of claims 1 to 4; The reflective sheet (11), the plurality of quantum dot LED light strips (12), the light guide plate (13) and the optical film are sequentially stacked and assembled in the middle frame (15).

6. A quantum dot LED light bar suitable for a high color gamut backlight module, characterized in that: include: Quantum membrane (1), white light patch LED lamp beads, fixed top block (3), substrate (4) and thermal conductive tape (5); Wherein, the plurality of fixed top blocks (3) are arranged in a straight line at a preset distance and are all printed and welded on the upper surface of the substrate (4); the plurality of white light SMD LED lamp beads are located between any two adjacent fixed top blocks (3) and are printed and welded on the upper surface of the substrate (4); The fixed top block (3) is made of FR4 material and is tin-plated on both sides; The height of the fixed top block (3) is greater than the height of the white light SMD LED lamp bead; The quantum membrane (1) is completely attached to the plurality of fixed top blocks (3); the thermal conductive tape (5) is attached to the lower surface of the substrate (4); The quantum membrane is bonded together with the LED light strip formed by multiple white light SMD LED lamp beads to form a finished product. When used in a monitor or a TV, a quantum membrane is added to each LED light strip, and there is no need to use a whole high color gamut quantum membrane on the backlight module of the monitor or TV. Only a high color gamut quantum membrane with the same width as the light strip PCB needs to be added to one light strip.

7. A backlight module suitable for high color gamut, characterized in that: include: A reflector (11), a quantum dot LED light bar (12) and a middle frame (15); the quantum dot LED light bar (12) is the quantum dot LED light bar as claimed in claim 6; Wherein, the reflective sheet (11) and a plurality of quantum dot LED light strips (12) are assembled in the middle frame (15).

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