Backlight structure for improving color saturation
By introducing a QD film layer into the backlight LED structure and using quantum dots to excite red or green light, the problem of high-cost phosphor in traditional technology is solved, and the color saturation is improved and cost reduction is achieved.
Patent Information
- Application Number
- CN202420428478.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-06
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-03-06
AI Technical Summary
High-cost nitride phosphor or KSF phosphor is used in traditional backlight LED structures to improve color saturation, resulting in higher product costs.
Using a structure including a backlight frame, an optical film material and a flexible circuit board, the QD film layer is added between the light guide plate, the lower diffusion film, the lower light-enhancing film and the upper light-enhancing film, so that the blue light emitted by the LED lamp is excited through the QD film layer. More red or green light, thereby increasing color saturation and avoiding the use of high-cost phosphors.
It effectively improves the color saturation of the backlight, reduces production costs, and improves the color gamut range and brightness of the display equipment.
Smart Images
Figure CN222354232U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of display, in particular to a backlight structure for improving color saturation. Background Art
[0002] In display devices, color saturation is one of the important parameters for evaluating the display effect of display devices. The higher the color saturation value, the richer and more vivid the colors that the display device can display.
[0003] However, the traditional way to solve the color saturation problem is mostly based on the structure of the backlight LED, that is, the backlight LED lamp uses a wick that can emit blue light, and the outer package of the LED lamp contains transparent glue containing yellow phosphor. The blue light excites the yellow phosphor and emits light to provide light source for the light guide plate. By setting the yellow phosphor, the color saturation of the backlight is changed. The yellow phosphor usually uses nitride phosphor or KSF phosphor, but the cost of using these two phosphors is very expensive, which leads to an increase in product cost. Utility Model Content
[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a backlight structure for improving color saturation.
[0005] The purpose of this utility model is achieved through the following technical solutions:
[0006] A backlight structure for improving color saturation comprises: a backlight frame, an optical film material and a flexible circuit board, wherein a limited position cavity is provided on the backlight frame, the optical film material is accommodated in the limited position cavity, the optical film material comprises a reflective film, a light guide plate, a lower diffusion film, a lower light-enhancing film and an upper light-enhancing film which are stacked in sequence from bottom to top; the optical film material further comprises a QD film layer, the QD film layer is located at any one layer between the light guide plate, the lower diffusion film, the lower light-enhancing film and the upper light-enhancing film; a plurality of LED lamps are arranged on the flexible circuit board, the flexible circuit board is arranged in the limited position cavity, and each of the LED lamps is located on one side of the light guide plate.
[0007] In one embodiment, the QD film layer is located between the light guide plate and the lower diffusion film.
[0008] In one embodiment, the size of the QD film layer is larger than the size of the lower diffusion film.
[0009] In one embodiment, the size of the lower diffusion film is greater than the size of the lower brightness enhancement film.
[0010] In one of the embodiments, a holding block is provided on a side of the limiting cavity close to the flexible circuit board, and the flexible circuit board is attached to the holding block.
[0011] In one embodiment, one end of the flexible circuit board away from the abutting block is attached to the light guide plate.
[0012] In one of the embodiments, a reflective layer is provided on a side of the abutting block facing the LED lamp.
[0013] In one embodiment, the size of the reflective film is larger than that of the light guide plate, and the side of the reflective film close to the flexible circuit board extends away from the light guide plate, so that the reflective film is partially located directly below the LED lamp.
[0014] In one of the embodiments, the backlight frame is an integrated rubber-iron frame.
[0015] In one of the embodiments, a shading pad is further included, and the shading pad is located above the optical film material and the flexible circuit board.
[0016] Compared with the prior art, the utility model has at least the following advantages:
[0017] The utility model discloses a backlight structure for improving color saturation by setting a backlight frame, an optical film material and a flexible circuit board, and adding a QD film layer to any layer between a light guide plate, a lower diffusion film, a lower light enhancement film and an upper light enhancement film. In this way, part of the blue light emitted by the LED lamp passes through the light guide plate and comes out of the light guide plate to reach the QD film layer. At this time, the blue light emitted by the LED lamp encounters the QD film to newly stimulate more corresponding red light or green light, thereby improving the color saturation of the backlight, while avoiding the use of existing high color gamut phosphors, thereby reducing the production cost of the product to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] 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.
[0019] Figure 1 This is a schematic structural diagram of a backlight structure for improving color saturation in one embodiment of the utility model;
[0020] Figure 2 for Figure 1 Schematic diagram of the partially enlarged structure at A of the backlight structure for improving color saturation. DETAILED DESCRIPTION
[0021] 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.
[0022] See also Figure 1 and Figure 2 As shown, a backlight structure 10 for improving color saturation includes: a backlight frame 100, an optical film material 200 and a flexible circuit board 300, a limited position cavity is opened on the backlight frame 100, the optical film material 200 is accommodated in the limited position cavity, the optical film material 200 includes a reflective film 210, a light guide plate 220, a lower diffusion film 230, a lower brightness enhancement film 240 and an upper brightness enhancement film 250 stacked in sequence from bottom to top; the optical film material 200 also includes a QD film layer 260, and the QD film layer 260 is located at any layer between the light guide plate 220, the lower diffusion film 230, the lower brightness enhancement film 240 and the upper brightness enhancement film 250; a plurality of LED lamps 310 are arranged on the flexible circuit board 300, the flexible circuit board 300 is arranged in the limited position cavity, and each LED lamp 310 is located on one side of the light guide plate 220.
[0023] It should be noted that the QD (Quantum Dots, quantum dots, a type of semiconductor nanocrystal) film layer 210, the particle size of the semiconductor nanocrystal determines the luminescence spectrum, that is, the same material only needs to change the particle size of the quantum dots to achieve coverage of the entire visible spectrum, which has the advantages of pure chromaticity and wide color gamut, and can greatly improve the color gamut range. For example, usually 3nm quantum dots can emit green light after being excited by blue light; 7nm quantum dots can emit red light after being excited by blue light; in the present utility model, the QD film layer 260 is located at any layer between the light guide plate 220, the lower diffusion film 230, the lower brightness enhancement film 240 and the upper brightness enhancement film 250, which means that the QD film layer 260 is set in the following positions: the first is to set the QD film layer between the light guide plate 220 and the lower diffusion film 230, and the second is to set the QD film layer between the lower diffusion film 230 and the lower brightness enhancement film 240. Film layer 210, thirdly, a QD film layer 210 is arranged between the lower brightness enhancement film 240 and the upper brightness enhancement film 250; in this way, part of the blue light emitted by the LED lamp 310 will reach the QD film layer 260 after coming out of the light guide plate 220, and the blue light will newly stimulate more corresponding red light or green light after encountering the quantum dots, thereby improving the color saturation of the backlight. In this way, it can replace the use of high color gamut phosphors, and at the same time avoid the patent requirements of phosphors, thereby reducing the dependence on foreign companies to a certain extent and cutting material costs.
[0024] Preferably, the QD film layer 260 is located between the light guide plate 220 and the lower diffusion film 230 .
[0025] Furthermore, the size of the QD film layer 260 is larger than that of the lower diffusion film 230. Since the QD film layer 260 is located between the light guide plate 220 and the lower diffusion film 230, the size of the QD film layer 260 can be made larger than that of the lower diffusion film 230. In this way, the QD film layer 260 can cover the display area of the corresponding display device to the greatest extent, avoiding the misalignment of the QD film layer 260 due to assembly deviation, thereby affecting the uniformity of color saturation at various positions in the display area of the display device.
[0026] Furthermore, the size of the lower diffusion film 230 is larger than that of the lower brightness enhancement film 240. The function of the diffusion film is to scatter the light through the diffusion coating, thereby making the light distribution uniform, so it is very important for the display effect of the display device. By making the size of the lower diffusion film 230 larger than that of the lower brightness enhancement film 240, it is possible to avoid assembly deviation, which causes the lower diffusion film 230 to deviate and affect the display effect.
[0027] Further, a holding block 110 is provided on one side of the limiting cavity close to the flexible circuit board 300, and the flexible circuit board 300 is attached to the holding block 110. For example, the flexible circuit board 300 is attached to the holding block 110 through the first double-sided adhesive 320, so as to form a connection and fixation. Further, one end of the flexible circuit board 300 away from the holding block 110 is attached to the light guide plate 220, for example, one end of the flexible circuit board 300 away from the holding block 110 is attached to the light guide plate 220 through the second double-sided adhesive 330, so that the LED lamp 310 can be located between the first double-sided adhesive 320 and the second double-sided adhesive 330, that is, by respectively adhering the two ends of the flexible circuit board 300 to the holding block 110 and the light guide plate 220, the LED lamp 310 is in a relatively sealed space, so that the light emitted by the LED lamp 310 can be reduced from leaking out, so as to reduce the light loss rate of the LED lamp 310.
[0028] Furthermore, a reflective layer 111 is provided on the side of the abutting block 110 facing the LED lamp 310. Since the light emitted by the LED lamp 310 irradiates the abutting block 110, light loss will occur. Therefore, the reflective layer 111 is provided on the side of the abutting block 110 facing the LED lamp 310. The reflective layer 111 reflects the light back to reduce the loss of light, thereby improving the overall brightness of the backlight. For example, the reflective layer 111 can be an existing reflective film.
[0029] Furthermore, the size of the reflective film 111 is larger than that of the light guide plate, and the side of the reflective film close to the flexible circuit board extends away from the light guide plate, so that the reflective film is partially located directly below the LED lamp. In this way, the light of the LED lamp will not directly irradiate the backlight frame 100, but irradiate the reflective film and be reflected by the reflective film, thereby reducing the loss of light and improving the overall brightness of the backlight.
[0030] Preferably, the backlight frame is a rubber-iron integrated frame.
[0031] Furthermore, a light shielding pad 400 is included, and the light shielding pad 400 is located above the optical film and the flexible circuit board. The light shielding pad 400 is a hollowed-out structure, and the purpose of the hollowing-out is to avoid the display area. At the same time, the light shielding pad 400 is partially attached to the flexible circuit board 300, and the light shielding pad 400 plays a role of shielding, preventing light from leaking from the side. For example, the light shielding pad 400 is a light shielding glue.
[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 backlight structure for improving color saturation, characterized in that: include: A backlight frame, wherein a limited position cavity is provided on the backlight frame; An optical film material, the optical film material is accommodated in the limiting cavity, and the optical film material comprises a reflective film, a light guide plate, a lower diffusion film, a lower brightness enhancement film and an upper brightness enhancement film which are sequentially stacked from bottom to top; The optical film material further includes a QD film layer, and the QD film layer is located at any layer between the light guide plate, the lower diffusion film, the lower brightness enhancement film, and the upper brightness enhancement film; A flexible circuit board is provided with a plurality of LED lights, the flexible circuit board is arranged in the limiting cavity, and each of the LED lights is located on one side of the light guide plate.
2. The backlight structure for improving color saturation according to claim 1, characterized in that: The QD film layer is located between the light guide plate and the lower diffusion film.
3. The backlight structure for improving color saturation according to claim 2, characterized in that: The size of the QD film layer is larger than that of the lower diffusion film.
4. The backlight structure for improving color saturation according to claim 3, characterized in that: The size of the lower diffusion film is greater than that of the lower brightness enhancement film.
5. The backlight structure for improving color saturation according to claim 1, characterized in that: A holding block is arranged on one side of the limiting cavity close to the flexible circuit board, and the flexible circuit board is attached to the holding block.
6. The backlight structure for improving color saturation according to claim 5, characterized in that: One end of the flexible circuit board away from the abutting block is attached to the light guide plate.
7. The backlight structure for improving color saturation according to claim 6, characterized in that: A reflective layer is arranged on the side of the abutting block facing the LED lamp.
8. The backlight structure for improving color saturation according to claim 1, characterized in that: The size of the reflective film is larger than that of the light guide plate, and a side of the reflective film close to the flexible circuit board extends away from the light guide plate, so that the reflective film is partially located directly below the LED lamp.
9. The backlight structure for improving color saturation according to claim 1, characterized in that: The backlight frame is a rubber-iron integrated frame.
10. The backlight structure for improving color saturation according to claim 1, characterized in that: It also includes a shading pad block, and the shading pad block is located above the optical film material and the flexible circuit board.