Double-layer backlight source device for liquid crystal display screen
By using a double-layer backlight device in the liquid crystal display screen to control the switches of the first backlight component and the second backlight component respectively, the problem of the need to open the full screen during local display in the prior art is solved, and more Energy-saving and environmentally friendly display effect.
Patent Information
- Application Number
- CN202423159968.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-12-20
AI Technical Summary
The backlight design of existing LCD displays also needs to be turned on in full screen when partially displayed, resulting in unnecessary energy consumption and lack of energy-saving and environmentally friendly solutions.
A double-layer backlight device is adopted, wherein the first backlight assembly and the second backlight assembly can respectively switch to achieve local lighting or full-screen lighting and reduce energy consumption.
Through the design of the double-layer backlight device, the LCD screen can flexibly switch lighting modes according to the different needs of the display content, effectively reducing energy consumption and making use more energy-saving and environmentally friendly.
Smart Images
Figure CN222439805U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of display, in particular to a double-layer backlight source device for a liquid crystal display screen. Background Art
[0002] The backlight is a light source located behind the LCD display. The LCD display itself does not emit light. The graphics it displays are the result of its modulation of light. The performance of the backlight will not only directly affect the visual effect of the LCD display module, but the cost of the backlight accounts for 3-5% of the display module, and the power consumed accounts for 75% of the entire module. It can be said to be a very important component in the display.
[0003] The backlight source of existing LCD screens usually adopts the method of full-screen uniform illumination, that is, the backlight source will remain fully on regardless of whether the display content covers the full screen. At present, many smart appliances (such as smart ovens, refrigerators, microwave ovens, etc.) use large-size LCD screens. Most of the time, these smart appliances only need to display information such as time in certain fixed areas, and they only need to display in full screen when performing human-computer interaction. If the backlight source design of the existing LCD screen is adopted, the backlight source must be fully turned on when performing partial display, which will cause unnecessary energy consumption, and thus it is not energy-saving and environmentally friendly to use. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide a double-layer backlight device for a liquid crystal display screen, which can be easily switched to local lighting or full-screen lighting to meet the different display requirements of the liquid crystal display screen, and is more energy-saving and environmentally friendly. The technical solution adopted is as follows:
[0005] A double-layer backlight device for a liquid crystal display screen, characterized in that it includes a first backlight assembly and a second backlight assembly; the first backlight assembly includes a first light guide plate, a first light source and a first light-transmissive reflective bottom layer, the first light source is arranged on the outer side of the side of the first light guide plate, and the first light-transmissive reflective bottom layer is arranged on the rear side of the first light guide plate; the second backlight assembly is arranged on the rear side of the first backlight assembly, and the light-emitting area of the second backlight assembly is located within the light-emitting area of the first backlight assembly.
[0006] The light-emitting area of the second backlight source assembly is located within the light-emitting area of the first backlight source assembly, which means that the light-emitting area of the second backlight source assembly is completely contained in the light-emitting area of the first backlight source assembly, and the light-emitting area of the second backlight source assembly is generally much smaller than the light-emitting area of the first backlight source assembly. As a preferred embodiment of the present invention, the light-emitting area of the second backlight source assembly is 0.2-0.5 times the light-emitting area of the first backlight source assembly.
[0007] In the above-mentioned double-layer backlight source device, the first light guide plate is generally a transparent plate body provided with reflective microstructures (such as reflective concave dots) distributed thereon. The function of the first light guide plate is to make the light emitted by the first light source form a uniform surface reflection to form a light-emitting area of the first backlight source assembly; the first reflective bottom layer is used to reflect part of the light from the first light source that leaks to the rear side of the first light guide plate to the front side of the first light guide plate, and it allows the light emitted by the second backlight source assembly to penetrate through; the second backlight source assembly is a surface light source arranged on the rear side of the first backlight source assembly, and its light can pass through the first reflective bottom layer to form a light-emitting area of the second backlight source assembly. This double-layer backlight device can be used in conjunction with a liquid crystal display and is applied to many smart appliances (such as smart ovens, refrigerators, microwave ovens, etc.). Most of the time, when only time and other information need to be displayed in certain fixed areas, only the second backlight component needs to be turned on and the first light source of the first backlight component needs to be turned off to achieve local illumination of the liquid crystal display; when full-screen display is required for human-computer interaction, the first light source of the first backlight component is turned on (the second backlight component can also be turned on as fill light) to achieve full-screen illumination of the liquid crystal display, thereby effectively reducing energy consumption and being more energy-saving and environmentally friendly.
[0008] As a preferred solution of the present utility model, the first light source adopts a first annular LED light bar, and the first annular LED light bar is arranged on the periphery of the side of the first light guide plate.
[0009] As a preferred solution of the utility model, the portion of the first reflective bottom layer corresponding to the light emitting area of the second backlight source assembly is hollowed out, so that the light emitted by the second backlight source assembly can directly pass through the hollowed-out portion and directly illuminate the first light guide plate, thereby achieving better light transmittance.
[0010] As a preferred solution of the present invention, the first reflective bottom layer is a white light-transmitting film (white plastic film).
[0011] As another preferred solution of the present invention, the first reflective bottom layer is a semi-transparent and semi-reflective mirror film.
[0012] As another preferred scheme of the utility model, the first reflective bottom layer is formed by overlapping a first reflective film and a second reflective film, the first reflective film is arranged on the rear side surface of the first light guide plate, the second reflective film is arranged on the rear side surface of the first reflective film, and the portion of the second reflective film corresponding to the light-emitting area of the second backlight source assembly is hollowed out.
[0013] As a preferred solution of the utility model, the first backlight source assembly further includes an optical film layer group, which is arranged on the front side of the first light guide plate. The optical film layer group is generally formed by stacking one or more layers of thin films such as a diffusion film and a brightness enhancement film. The optical film layer group can provide a more uniform backlight illumination effect and improve optical functions such as brightness at a normal viewing angle.
[0014] As a preferred embodiment of the utility model, the double-layer backlight source device further comprises a shell, the interior of the shell comprises a front cavity and a rear cavity, the rear cavity is located at the rear side of the front cavity and communicates with the middle of the front cavity, and the cross-sectional area of the rear cavity is smaller than the cross-sectional area of the front cavity; the first backlight source assembly is arranged in the front cavity, and the second backlight source assembly is arranged in the rear cavity. The shell serves as a carrier of the first backlight source assembly and the second backlight source assembly, which can facilitate their installation on the one hand, and protect the first backlight source assembly and the second backlight source assembly on the other hand. Specifically, the shell is generally made of high-strength and wear-resistant materials, such as metal alloys, plastic composite materials, etc., which can provide sufficient mechanical strength and stability; in order to improve its heat dissipation, heat dissipation holes or heat dissipation structures are generally provided on the shell.
[0015] As a preferred solution of the utility model, the second backlight source assembly includes a second light guide plate, a second light source and a second reflective bottom layer, the second light guide plate is arranged in the second area, the second light source is arranged on one side of the second light guide plate, and the second reflective bottom layer is arranged on the rear side of the second light guide plate. In the above-mentioned second backlight source assembly, the second light guide plate is generally a transparent plate body provided with reflective microstructures (such as reflective concave dots) distributed thereon, and its function is to make the light emitted by the second light source form a uniform surface reflection in the light-emitting area of the second backlight source assembly; the second reflective bottom layer can be a white film or a mirror film (which can be light-transmissive or not), and the function of the second reflective bottom layer is to reflect part of the light from the second light source leaking to the rear side of the second light guide plate to the front side of the second light guide plate.
[0016] Generally, the dual-layer backlight device may further include a corresponding circuit connected to each light source (including the first light source and the second light source), such as an FPC circuit.
[0017] As a further preferred solution of the present invention, the second light source adopts a second annular LED light bar, and the second annular LED light bar is arranged on the periphery of the side of the second light guide plate.
[0018] As another preferred embodiment of the present invention, the second backlight source assembly includes a second light source and a diffusion layer, the diffusion layer is arranged on the rear side surface of the middle part of the first light guide plate, and the second light source is arranged on the rear side of the diffusion layer. When working, the light emitted by the second light source irradiates the diffusion layer to form a surface light source. Specifically, according to the required light emitting area of the second backlight source assembly, the second light source can be a single LED lamp or an LED array distributed in the light emitting area, thereby making the brightness of the second backlight source assembly higher.
[0019] As a further preferred embodiment of the present invention, the diffusion layer is a scattering film or a scattering plate, such as a white plastic film or an organic glass plate.
[0020] Compared with the prior art, the utility model has the following advantages:
[0021] When this double-layer backlight device is used in many smart appliances (such as smart ovens, refrigerators, microwave ovens, etc.), it can be conveniently switched to local lighting or full-screen lighting according to whether the display content covers the entire screen: when most of the time only time and other information need to be displayed in certain fixed areas, only the second backlight component needs to be turned on, and the first light source of the first backlight component needs to be turned off to achieve local lighting of the LCD screen; when full-screen display is required for human-computer interaction, the first light source of the first backlight component is turned on to achieve full-screen lighting of the LCD screen (the second backlight component can also be turned on as fill light), effectively reducing energy consumption and being more energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a structural schematic diagram of Example 1 of the preferred implementation mode of the utility model.
[0023] Figure 2 It is a structural schematic diagram of Example 2 of the preferred implementation mode of the utility model.
[0024] Figure 3 It is a structural schematic diagram of Example 3 of the preferred implementation mode of the utility model.
[0025] Figure 4 It is a structural schematic diagram of Example 4 of the preferred implementation mode of the present utility model. DETAILED DESCRIPTION
[0026] Embodiment 1, as Figure 1As shown, this double-layer backlight source device for a liquid crystal display screen includes a first backlight source assembly 1 and a second backlight source assembly 2; the first backlight source assembly 1 includes a first light guide plate 11, a first light source 12 and a first light-transmissive reflective bottom layer 13, the first light source 12 is arranged on the side periphery of the first light guide plate 11, and the first light-reflective bottom layer 13 is arranged on the rear side of the first light guide plate 11; the second backlight source assembly 2 is arranged on the rear side of the first backlight source assembly 1, the second backlight source assembly 2 includes a second light guide plate 21, a second light source 22 and a second reflective bottom layer 23, the second light guide plate 21 is arranged in the second area, the second light source 22 is arranged on one side of the side of the second light guide plate 21, and the second reflective bottom layer 23 is arranged on the rear side of the second light guide plate 21; the light-emitting area 20 of the second backlight source assembly 2 is located within the light-emitting area 10 of the first backlight source assembly 1.
[0027] In this embodiment, the area of the light emitting region 20 of the second backlight source assembly 2 is 0.3 times the area of the light emitting region 10 of the first backlight source assembly 1 .
[0028] In this embodiment, the first light guide plate 11 is a transparent plate body provided with reflective microstructures (such as reflective concave spots); the first light source 12 adopts a first annular LED light strip, and the first annular LED light strip is arranged on the periphery of the side of the first light guide plate 11; the first reflective bottom layer 13 is a white translucent film (white plastic film) or a semi-transparent and semi-reflective mirror film.
[0029] In this embodiment, the first backlight source assembly 1 further includes an optical film layer group 14, which is disposed on the front side of the first light guide plate 11. The optical film layer group 14 is formed by stacking multiple layers of thin films such as a diffusion film and a brightness enhancement film. The optical film layer group 14 can provide a more uniform backlight illumination effect and improve optical functions such as brightness at a normal viewing angle.
[0030] In this embodiment, the second light guide plate 21 is a transparent plate body provided with reflective microstructures (such as reflective concave spots); the second light source 22 is a second annular LED light strip, and the second annular LED light strip is arranged on the periphery of the side of the second light guide plate 21; the second reflective bottom layer 23 can be a white film or a mirror film (which can be light-transmissive or opaque).
[0031] In this embodiment, the double-layer backlight device further comprises a housing 3, the interior of which comprises a front cavity 301 and a rear cavity 302, the rear cavity 302 being located at the rear side of the front cavity 301 and communicating with the middle of the front cavity 301, and the cross-sectional area of the rear cavity 302 being smaller than the cross-sectional area of the front cavity 301; the first backlight assembly 1 is arranged in the front cavity 301, and the second backlight assembly 2 is arranged in the rear cavity 302. The housing 3 is made of a high-strength and wear-resistant material, such as a metal alloy, a plastic composite material, etc., which can provide sufficient mechanical strength and stability. The housing 3 serves as a carrier of the first backlight assembly 1 and the second backlight assembly 2, which can be conveniently installed on the one hand, and can protect the first backlight assembly 1 and the second backlight assembly 2 on the other hand. The double-layer backlight device further comprises a corresponding circuit connected to the first light source 12 and the second light source 22, such as an FPC circuit.
[0032] The working principle of this double-layer backlight device is briefly described below:
[0033] This double-layer backlight device can be used in conjunction with a liquid crystal display screen and is applied to many smart appliances (such as smart ovens, refrigerators, microwave ovens, etc.). When only time and other information need to be displayed in certain fixed areas most of the time, it is only necessary to turn on the second light source 22 of the second backlight source assembly 2 and turn off the first light source 12 of the first backlight source assembly 1. At this time, the first light guide plate 12 causes the light emitted by the second light source 22 to form a uniform surface reflection within the light-emitting area 20 of the second backlight source assembly 2, and the second reflective bottom layer 23 reflects part of the light from the second light source 22 that leaks to the rear side of the second light guide plate 21 to the front side of the second light guide plate 21 and passes through the first reflective bottom layer 13 to achieve local illumination of a fixed area of the liquid crystal display screen. When full-screen display is required for human-computer interaction, the first light source 12 of the first backlight assembly 1 is turned on (the second light source 22 of the second backlight assembly 2 can also be turned on as fill light). At this time, the first light guide plate 11 causes the light emitted by the first light source 12 to form a uniform surface reflection. At the same time, the first reflective bottom layer 13 reflects part of the light leaked from the first light source 12 to the rear side of the first light guide plate 11 to the front side of the first light guide plate 11, so as to achieve full-screen illumination of the liquid crystal display.
[0034] Example 2, reference Figure 2 , when other parts are the same as those of the first embodiment, the difference is that the second backlight source assembly 2 includes a second light source 22 and a diffusion layer 23, the diffusion layer 23 is arranged on the rear side of the middle part of the first light guide plate 11, and the second light source 22 is arranged on the rear side of the diffusion layer 23. When working, the light emitted by the second light source 22 irradiates the diffusion layer 23 to form a surface light source.
[0035] In this embodiment, the second light source 22 is an LED array distributed in the light emitting area 20 , thereby enabling the brightness of the second backlight source assembly 2 to be higher.
[0036] In this embodiment, the diffusion layer 23 is a diffusion film or a diffusion plate, such as a white plastic film or an organic glass plate.
[0037] Example 3, reference Figure 3 , while other parts are the same as those of the first embodiment, the difference is that in this embodiment, the portion of the first light reflecting bottom layer 13 corresponding to the light emitting area 20 of the second backlight source assembly 2 is hollowed out. Thus, the light emitted by the second backlight source assembly 2 can directly pass through the hollowed-out portion and directly illuminate the first light guide plate 11, and the light transmittance is better.
[0038] Example 4, reference Figure 4 , while other parts are the same as those in the first embodiment, the difference is that: in this embodiment, the first reflective bottom layer 13 is formed by overlapping a first reflective film 131 and a second reflective film 132, the first reflective film 131 is arranged on the rear side surface of the first light guide plate 11, the second reflective film 132 is arranged on the rear side surface of the first reflective film 131, and the portion of the second reflective film 132 corresponding to the light-emitting area 20 of the second backlight source assembly 2 is hollowed out.
[0039] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different, and any equivalent or simple changes made based on the structure, features and principles of the utility model patent are included in the protection scope of the utility model patent. The technical personnel in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.
Claims
1. A double-layer backlight device for a liquid crystal display screen, characterized in that: It includes a first backlight source assembly and a second backlight source assembly; the first backlight source assembly includes a first light guide plate, a first light source and a first light-transmissive reflective bottom layer, the first light source is arranged on the outer side of the side of the first light guide plate, and the first light-transmissive reflective bottom layer is arranged on the rear side of the first light guide plate; the second backlight source assembly is arranged on the rear side of the first backlight source assembly, and the light-emitting area of the second backlight source assembly is located within the light-emitting area of the first backlight source assembly.
2. A double-layer backlight device for a liquid crystal display screen according to claim 1, characterized in that: The first light source is a first annular LED light bar, and the first annular LED light bar is arranged on the periphery of the side of the first light guide plate.
3. The double-layer backlight device for a liquid crystal display screen according to claim 1, characterized in that: A portion of the first reflective bottom layer corresponding to the light emitting area of the second backlight source assembly is hollowed out.
4. The double-layer backlight device for a liquid crystal display according to claim 1, characterized in that: The first reflective bottom layer is a white light-transmitting film or a semi-transparent and semi-reflective mirror film.
5. The double-layer backlight device for a liquid crystal display screen according to claim 1, characterized in that: The first reflective bottom layer is formed by overlapping a first reflective film and a second reflective film, the first reflective film is arranged on the rear side of the first light guide plate, the second reflective film is arranged on the rear side of the first reflective film, and the part of the second reflective film corresponding to the light-emitting area of the second backlight source assembly is hollowed out.
6. A double-layer backlight device for a liquid crystal display screen according to any one of claims 1 to 5, characterized in that: The first backlight source assembly further includes an optical film layer group, and the optical film layer group is disposed on the front side of the first light guide plate.
7. A double-layer backlight device for a liquid crystal display screen according to any one of claims 1 to 5, characterized in that: The double-layer backlight device also includes a shell, the interior of the shell has a front cavity and a rear cavity, the rear cavity is located at the rear side of the front cavity and communicates with the middle of the front cavity, and the cross-sectional area of the rear cavity is smaller than the cross-sectional area of the front cavity; The first backlight source assembly is disposed in the front cavity, and the second backlight source assembly is disposed in the rear cavity.
8. A double-layer backlight device for a liquid crystal display screen according to any one of claims 1 to 5, characterized in that: The second backlight source assembly includes a second light guide plate, a second light source and a second reflective bottom layer. The second light guide plate is arranged in the second area, the second light source is arranged on one side of the second light guide plate, and the second reflective bottom layer is arranged on the rear side of the second light guide plate.
9. A double-layer backlight device for a liquid crystal display screen according to any one of claims 1 to 5, characterized in that: The second backlight source assembly includes a second light source and a diffusion layer. The diffusion layer is arranged on the rear side of the middle portion of the first light guide plate, and the second light source is arranged on the rear side of the diffusion layer.
10. A double-layer backlight device for a liquid crystal display screen according to claim 9, characterized in that: The diffusion layer is a diffusion film or a diffusion plate.