High-color-gamut backlight module

Abstract

The utility model discloses a high-color-gamut backlight module which is characterized by comprising a fixing frame, an optical element and an LED lamp strip, and a containing cavity is formed in the fixing frame; the optical element is arranged in the containing cavity and comprises a light guide plate, and the light guide plate is located in the containing cavity; the LED lamp strip comprises a lamp strip FPC and a plurality of LED lamps, the LED lamps are arranged on the lamp strip FPC at intervals, the lamp strip FPC is arranged in the containing cavity, the LED lamps are located on one side of the light guide plate, the side face, facing the LED lamps, of the light guide plate is a light inlet face, and a QD thin film layer is arranged on the light inlet face. According to the utility model, the optical element and the LED lamp bar can be protected and stabilized through the fixing frame, and the QD thin film layer is arranged on the light incident surface, facing the LED lamp, of the guide plate, so that part of blue light emitted by the LED can reach the QD thin film layer before entering the light guide plate, and more corresponding red light or green light is excited after the blue light encounters the QD thin film layer; therefore, the backlight color saturation can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of display, in particular to a high color gamut backlight module. Background Art

[0002] With the rapid development of display technology, people's requirements for display devices are getting higher and higher, especially in terms of color reproduction and color gamut coverage. Existing display devices need to meet wider and more sophisticated color requirements. Among them, color saturation is one of the important parameters of smartphone display effects. The higher its value, the richer and more gorgeous the display can display. In the mobile phone LCD screen, the backlight module is also one of the important factors affecting the color saturation of the entire mobile phone. The traditional way to improve color saturation is to change the structure of the LED lamp, that is, each LED lamp is encapsulated by a blue wick and a yellow fluorescent glue (transparent glue containing yellow fluorescent powder) on the periphery. The blue light excites the yellow fluorescent powder and emits white light to provide light source for the light guide plate. The main factor affecting the color saturation of the backlight is the composition of the fluorescent powder. The cost of using fluorescent powder is relatively high. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a high color gamut backlight module that can reduce costs.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A high color gamut backlight module, characterized in that it includes: a fixing frame, an optical element and an LED light strip, wherein the fixing frame is provided with a receiving cavity; the optical element is arranged in the receiving cavity, the optical element includes a light guide plate, and the light guide plate is located in the receiving cavity; and the LED light strip includes a light strip FPC and a plurality of LED lamps, each of the LED lamps is arranged on the light strip FPC at intervals, the light strip FPC is arranged in the receiving cavity, and the LED lamp is located on one side of the light guide plate, and a side of the light guide plate facing the LED lamp is a light incident surface, and a QD film layer is arranged on the light incident surface.

[0006] In one embodiment, the fixing frame is a rubber-iron integrated frame.

[0007] In one of the embodiments, a mounting portion is provided on one side of the integrated rubber-iron frame close to the light bar FPC, and the light bar FPC is mounted on the mounting portion.

[0008] In one embodiment, the light bar FPC is adhered to the mounting portion by double-sided adhesive.

[0009] In one of the embodiments, one end of the light bar FPC away from the mounting portion is attached to the light guide plate by double-sided foam adhesive.

[0010] In one of the embodiments, a white ink layer is provided on a side surface of the mounting portion facing the LED lamp.

[0011] In one of the embodiments, a white ink layer is provided on one side of the light bar FPC where the LED light is provided.

[0012] In one embodiment, the optical element includes a reflective film, and the reflective film is located between the light guide plate and the bottom of the accommodating cavity, and one side of the reflective film extends to directly below the LED lamp.

[0013] In one embodiment, the optical element further includes a diffusion film, a lower brightness enhancement film and an upper brightness enhancement film, and the reflective film, the light guide plate, the diffusion film, the lower brightness enhancement film and the upper brightness enhancement film are stacked in sequence from bottom to top.

[0014] In one of the embodiments, a light shielding glue is further included, and the light shielding glue is located above the optical element, and the light shielding glue is partially attached to the light bar FPC.

[0015] Compared with the prior art, the utility model has at least the following advantages:

[0016] The high color gamut backlight module of the present invention is equipped with a fixing frame, an optical element and an LED light strip, so that the optical element and the LED light strip can be protected and stabilized by the fixing frame, and a QD film layer is arranged on the light incident surface of the guide plate facing the LED lamp. In this way, part of the blue light emitted by the LED lamp can reach the QD film layer before entering the light guide plate. After the blue light encounters the QD film layer, more corresponding red light or green light is newly stimulated, thereby improving the color saturation of the backlight, and at the same time replacing the existing technical solution using fluorescent powder to reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.

[0018] Figure 1 This is a schematic diagram of the stacking structure of a high color gamut backlight module in one embodiment of the utility model;

[0019] Figure 2 It is a structural schematic diagram of a light guide plate and an LED light strip of a high color gamut backlight module in one embodiment of the utility model. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0021] See also Figure 1 and Figure 2 As shown, a high color gamut backlight module 10 includes: a fixing frame 100, an optical element 200 and an LED light strip 300, wherein a receiving cavity is provided on the fixing frame 100; the optical element 200 is arranged in the receiving cavity, and the optical element 200 includes a light guide plate 210, and the light guide plate 210 is located in the receiving cavity; the LED light strip 300 includes a light strip FPC 310 and a plurality of LED lamps 320, wherein each LED lamp is arranged on the light strip FPC (flexible circuit board) at intervals, and the light strip FPC is arranged in the receiving cavity, and the LED lamp is located on one side of the light guide plate, and a side of the light guide plate 210 facing the LED lamp 300 is a light incident surface, and a QD film layer 211 is arranged on the light incident surface.

[0022] It should be noted that the optical element 200 and the LED light bar 300 are protected and stabilized by the fixing frame 100, and a QD (Quantum Dots) film layer 211 is set on the light incident surface of the guide plate 210 facing the LED lamp 320. In this way, part of the blue light emitted by the LED lamp 320 can reach the QD film layer 211 before entering the light guide plate 210. After the blue light encounters the QD film layer 211, more corresponding red light or green light is newly stimulated, thereby improving the color saturation of the backlight, and replacing the existing technical solution using fluorescent powder to reduce production costs. Among them, quantum dots are a kind of semiconductor nanocrystals (particle size 1 to 10nm). The particle size determines the luminous spectrum. The same material only needs to change the quantum dot particles to achieve coverage of the entire visible spectrum. Its chromaticity is pure and the color gamut is wide, which can greatly improve the color gamut range. Usually, quantum dots of about 3nm emit green light after being excited by blue light, and quantum dots of about 7nm emit red light after being excited by blue light. Quantum dots of different particle sizes can be selected according to actual needs.

[0023] Preferably, the fixing frame 100 is a plastic-iron integrated frame, which can reduce the use of metal, realize a lightweight design of the fixing frame 100 , and make the backlight module 10 thinner and lighter.

[0024] Furthermore, a mounting portion 110 is provided on one side of the integrated rubber-iron frame close to the light bar FPC310 , and the light bar FPC310 is mounted on the mounting portion 110 .

[0025] It should be noted that in order to avoid the problem of light leakage of the LED lamp to the greatest extent, in this embodiment, the light bar FPC310 is installed sideways, that is, the installation position of the light bar FPC310 makes the LED lamp located between the light bar FPC310 and the bottom of the accommodating cavity, and the LED lamp is separated from the outside by the light bar FPC310, thereby reducing the light leakage of the light bar FPC310. Preferably, the light bar FPC310 is adhered to the mounting portion 110 by double-sided adhesive, thereby ensuring the connection stability of the light bar FPC310. In this embodiment, the double-sided adhesive can be a heat-conducting double-sided adhesive, and the heat of the light bar FPC310 is dissipated by the heat-conducting double-sided adhesive, thereby achieving rapid heat dissipation.

[0026] Furthermore, one end of the light bar FPC 310 away from the mounting portion 110 is attached to the light guide plate 210 by double-sided foam adhesive. That is, one end of the light bar FPC 310 is abutted and connected to the mounting portion 110, and the other end of the light bar FPC 310 is abutted and connected to the light guide plate 210, thereby forming a relatively sealed space, so that the LED lamp is located between the light guide plate 210 and the mounting portion 110, that is, the LED lamp is located in the sealed space, so that the light emitted by the LED lamp will not leak out.

[0027] Furthermore, a white ink layer is provided on one side of the mounting portion 110 facing the LED lamp 320. The white ink layer can be coated onto the mounting portion 110. In this way, the light emitted by the LED lamp 320 can be reflected by the white ink layer, thereby achieving the effect of improving the brightness.

[0028] Furthermore, a white ink layer is provided on one side of the light strip FPC310 on which the LED lamp 320 is provided. The white ink layer here can be printed on the side of the light strip FPC310 on which the LED lamp 320 is provided by silk screen printing, and care should be taken to avoid the binding position of the LED lamp 320. The light emitted by the LED lamp 320 is reflected by the white ink layer, thereby reducing the loss of light and further increasing the brightness, so as to increase the brightness of the display.

[0029] Furthermore, the optical element 200 includes a reflective film 220, which is located between the light guide plate 210 and the bottom of the accommodating cavity, and one side of the reflective film 220 extends to directly below the LED lamp 320. Since one side of the reflective film 220 extends to directly below the LED lamp 320, the light emitted by the LED lamp 320 will not be directly irradiated onto the fixing frame 100 and lost, and the light of the LED lamp 320 is reflected by the reflective film 220, thereby further reducing the light loss of the LED lamp 320 to improve the overall brightness.

[0030] Furthermore, the optical element 200 further includes a diffusion film 230, a lower brightness enhancement film 240 and an upper brightness enhancement film 250, and the reflective film 220, the light guide plate 210, the diffusion film 230, the lower brightness enhancement film 240 and the upper brightness enhancement film 250 are stacked in sequence from bottom to top. The function of the diffusion film 230 is to diffuse the light evenly to achieve the uniformity of the light; and the function of the lower brightness enhancement film 240 and the upper brightness enhancement film 250 is to enhance the brightness of the light to ensure the display effect.

[0031] Furthermore, the high color gamut backlight module further includes a light shielding adhesive 400, which is located above the optical element 200 and partially attached to the light bar FPC 310. For example, the light shielding adhesive 400 is a foam light shielding tape, and the light shielding adhesive 400 can further reduce light leakage.

[0032] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A high color gamut backlight module, characterized in that: include: A fixing frame, wherein a receiving cavity is formed on the fixing frame; an optical element, the optical element being disposed in the accommodating cavity, the optical element comprising a light guide plate, the light guide plate being located in the accommodating cavity; and An LED light bar, the LED light bar includes a light bar FPC and a plurality of LED lights, each of the LED lights is arranged on the light bar FPC at intervals, the light bar FPC is arranged in the accommodating cavity, and the LED lights are located on one side of the light guide plate, and a side of the light guide plate facing the LED lights is a light incident surface, and a QD film layer is arranged on the light incident surface.

2. The high color gamut backlight module according to claim 1, characterized in that: The fixing frame is a rubber-iron integrated frame.

3. The high color gamut backlight module according to claim 2, characterized in that: A mounting portion is provided on one side of the integrated rubber-iron frame close to the light bar FPC, and the light bar FPC is mounted on the mounting portion.

4. The high color gamut backlight module according to claim 3, characterized in that: The light bar FPC is adhered to the mounting portion by double-sided adhesive.

5. The high color gamut backlight module according to claim 3, characterized in that: One end of the light bar FPC away from the mounting portion is attached to the light guide plate by double-sided foam bonding.

6. The high color gamut backlight module according to claim 4, characterized in that: A white ink layer is arranged on a side surface of the mounting portion facing the LED lamp.

7. The high color gamut backlight module according to claim 5, characterized in that: A white ink layer is arranged on one side of the light bar FPC on which the LED light is arranged.

8. The high color gamut backlight module according to claim 6, characterized in that: The optical element comprises a reflective film, wherein the reflective film is located between the light guide plate and the bottom of the accommodating cavity, and one side of the reflective film extends to directly below the LED lamp.

9. The high color gamut backlight module according to claim 8, characterized in that: The optical element further comprises a diffusion film, a lower brightness enhancement film and an upper brightness enhancement film. The reflective film, the light guide plate, the diffusion film, the lower brightness enhancement film and the upper brightness enhancement film are stacked in sequence from bottom to top.

10. The high color gamut backlight module according to claim 9, characterized in that: It also includes light shielding glue, which is located above the optical element and partially attached to the light bar FPC.

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