CN214954431U - Light-adjustable backlight module and backlight display device - Google Patents

Abstract

The utility model provides a light-adjustable backlight module and a backlight display device, which relate to the technical field of skylight, panoramic awning and glass curtain wall in the automobile industry, and the light-adjustable backlight module comprises a light-adjusting component and a light source component; the light-adjusting component comprises a PDLC film, a light guide plate and a PDLC film power supply, wherein the PDLC film is attached to one side of the light guide plate, the PDLC film is provided with an electrode side, and the electrode side is electrically connected with the PDLC film power supply; the light source component comprises a light emitting piece and an LED power supply, the light emitting piece is installed on one side or two sides of the light guide plate, the light emitting piece is electrically connected with the LED power supply, the problem that the function of an LED backlight light source in the prior art is single, the application field of the light emitting piece is generally the liquid crystal display field, the technical problem that the application in other fields is less is solved, and the technical effect that the application range is wide is achieved.

Description

Light-adjustable backlight module and backlight display device

Technical Field

The utility model belongs to the technical field of auto industry's skylight, panorama canopy and glass curtain wall technique and specifically relates to a backlight unit and backlight display device can adjust luminance.

Background

The LED (Light Emitting Diode) backlight technology is widely applied in the fields of lcd tvs and panel lamps. The LED panel light is designed to form an even plane light-emitting effect mainly through a high-light-transmittance light guide plate, so that the LED panel light is good in illumination uniformity, soft and comfortable in light and free from brightness loss, and eyestrain can be effectively relieved. Generally, the LED backlight may be classified into a side-in type backlight and a direct type backlight according to the position of the light source.

In the side-in type backlight technology, if incident light touches scattered light points in the conduction process of the light guide plate, diffuse reflection light at each angle is formed, and the propagation of light energy is changed along with the length of the light guide plate, so that in order to ensure the uniformity of emergent light, the light emitting efficiency is increased along with the increase of the length of the light guide plate, and the intensity of the diffuse reflection light is in direct proportion to the incident light intensity at the position and in direct proportion to the area of the scattered light points. Therefore, in the incident light transmission process, the intensity of the incident light is gradually weakened due to the diffuse reflection effect, so that in order to ensure that the light emitted from two sides of the light guide plate can be uniform, the diameter of the scattering point close to the end of the light source is smaller, and the diameter of the scattering point at the other end is larger, in the backlight design, a main aim and challenge is to ensure that the utilization efficiency of the light is improved in the vertical light transmission direction, and the final optimal brightness and uniformity can be obtained by continuously and repeatedly adjusting the dot parameters for optimization.

The direct type backlight is composed of a reflecting film, an LED lamp matrix, a diffusion film and a light-intensifying membrane, the LED matrix is arranged between the reflecting film and the diffusion film, and the volume of the backlight type LED is generally larger, so that the direct type backlight is suitable for large-size products. Compared with a direct backlight, the side-in backlight is added with the light guide plate, so that the LED matrix can be distributed on the side face of the whole dimmable backlight module, the size of the whole dimmable backlight module is greatly reduced, and the side-in backlight has the advantage of energy conservation compared with the direct backlight.

However, the conventional LED backlight light source can only be used as a light source, and has a single function, and the application field thereof is generally the liquid crystal display field, and the application in other fields is less.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a backlight unit and backlight display device can adjust luminance to alleviate the LED backlight source's that exists among the prior art function comparatively single, its application is mostly the liquid crystal display field generally, at the less technical problem of application in other fields.

In a first aspect, the utility model provides a backlight module can adjust luminance, include: a dimming component and a light source component;

the light modulation assembly comprises a PDLC film (Polymer dispersed Liquid Crystal), a light guide plate and a PDLC film power supply, wherein the PDLC film is attached to one side of the light guide plate, the PDLC film is provided with an electrode side, and the electrode side is electrically connected with the PDLC film power supply;

the light source assembly comprises a light emitting piece and an LED power supply, the light emitting piece is arranged on one side or two sides of the light guide plate, and the light emitting piece is electrically connected with the LED power supply;

according to the power-on and power-off states of the PDLC film power supply and the LED power supply, the dimmable backlight module can be switched among a transparent state, a fog state and a backlight source state.

Further, the PDLC film comprises a first matrix layer, a first conducting layer, a polymer liquid crystal layer, a second conducting layer and a second matrix layer which are sequentially arranged.

Further, the first substrate layer and the second substrate layer both adopt a PET (polyethylene terephthalate) layer; the first conductive layer and the second conductive layer are both made of an ITO (Indium tin oxide) layer.

Further, the light guide plate is manufactured by laser etching or UV (UltraViolet) screen printing.

And/or the light guide plate is made of PC (Polycarbonate), PMMA (polymethyl methacrylate) or silica glass.

Further, the light-emitting piece adopts an LED lamp strip;

the LED lamp belts are arranged into a group, and the group of LED lamp belts are arranged on one side of the light guide plate; or the LED lamp belts are arranged into two groups, and the two groups of LED lamp belts are respectively arranged on two opposite sides of the light guide plate.

Furthermore, the dimmable backlight module also comprises an outer frame;

the periphery of the light guide plate is arranged on the outer frame.

Furthermore, one side of the PDLC film, which is deviated from the light guide plate, is provided with an optical plate, and the periphery of the optical plate is arranged on the outer frame.

Furthermore, the optical plate is made of PC, PMMA or silica glass.

Furthermore, an optical plate is arranged on one side of the PDLC film, which is far away from the light guide plate;

the PDLC membrane with all laminate between the light guide plate and the PDLC membrane with the hot melt adhesive layer between the optical plate, the PDLC membrane with the light guide plate, the optical plate and two-layer the hot melt adhesive layer forms five mingzhi structure.

Has the advantages that:

the utility model provides a dimmable backlight module, PDLC membrane is attached to one side of light guide plate, PDLC membrane has the electrode side, the electrode side is connected with PDLC membrane power supply electricity, the illuminating part is installed in the light guide plate, and the illuminating part is connected with LED power supply electricity; when the light-adjustable backlight module is used specifically, when the LED power supply is not electrified and the PDLC film power supply is electrified, the whole light-adjustable backlight module is in a transparent state; when the PDLC film power supply and the LED power supply are not electrified, the whole dimmable backlight module is in a fog state, and the dimmable backlight module can be switched among a transparent state, a fog state and a backlight source state according to the on-off state of the PDLC film power supply and the LED power supply, so that the dimmable backlight module can meet the requirements of the fields of liquid crystal televisions, skylights, panoramic sky curtains, glass curtain walls and the like in the automobile industry due to the characteristic of flexible switching among the transparent state, the fog state and the backlight source state. In addition, when the PDLC film power supply is not powered and the LED power supply is powered, the PDLC film presents an opaque fog state, the light advancing direction is changed after the light emitted by the light emitting element passes through the light guide plate, and the light emitted by the light guide plate passes through the PDLC film.

In a second aspect, the present invention provides a backlight display device, including: the dimmable backlight module of any preceding embodiment.

Has the advantages that:

the utility model provides a backlight display device includes aforementioned backlight unit of can adjusting luminance, and from this, beneficial effect that this backlight display device can reach and technological advantage are the same including beneficial effect and the technological advantage that backlight unit of can adjusting luminance can reach, no longer describe here.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is one of the split schematic views of a first implementation manner of a dimmable backlight module according to an embodiment of the present invention;

fig. 2 is a second schematic split view of the first implementation manner of the dimmable backlight module according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a PDLC film;

FIG. 4 is a schematic view of a illuminance test area;

fig. 5 is one of the split schematic diagrams of the second implementation manner of the dimmable backlight module according to the embodiment of the present invention.

Icon:

100-PDLC film; 110-electrode side; 120-a first substrate layer; 130-a first conductive layer; 140-a polymer liquid crystal layer; 150-a second conductive layer; 160-a second substrate layer;

200-a light guide plate;

300-PDLC film power supply;

400-a light emitting member;

500-LED power supply;

600-an outer frame;

700-optical plate;

800-hot melt adhesive layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Example one

As shown in fig. 1 and fig. 2, the present embodiment provides a dimmable backlight module, which includes a dimming component and a light source component; the dimming assembly comprises a PDLC film 100, a light guide plate 200 and a PDLC film power supply 300, wherein the PDLC film 100 is attached to one side of the light guide plate 200, the PDLC film 100 is provided with an electrode side 110, and the electrode side 110 is electrically connected with the PDLC film power supply 300; the light source assembly includes a light emitting member 400 and an LED power supply 500, the light emitting member 400 is mounted on one side or both sides of the light guide plate 200, and the light emitting member 400 is electrically connected to the LED power supply 500; according to the on-off state of the PDLC film power supply 300 and the LED power supply 500, the dimmable backlight module can be switched among a transparent state, a fog state and a backlight source state.

In the dimmable backlight module of the present embodiment, the PDLC film 100 is attached to one side of the light guide plate 200, the PDLC film 100 has an electrode side 110, the electrode side 110 is electrically connected to the PDLC film power supply 300, the light emitting element 400 is mounted on the light guide plate 200, and the light emitting element 400 is electrically connected to the LED power supply 500; when the PDLC film power supply 300 and the LED power supply 500 are electrified in specific use, the whole dimmable backlight module is in a transparent state; when the PDLC film power supply 300 and the LED power supply 500 are not powered on, the entire dimmable backlight module exhibits a foggy state, and the dimmable backlight module can be switched among a transparent state, a foggy state and a backlight source state according to the power-on and power-off states of the PDLC film power supply 300 and the LED power supply 500, and the characteristics of flexible switching among the transparent state, the foggy state and the backlight source state enable the dimmable backlight module to meet the requirements of the fields of liquid crystal televisions, skylights, panoramic backdrops, glass curtain walls and the like in the automobile industry.

In addition, when the PDLC film power supply 300 is not supplying power and the LED power supply 500 is supplying power, the PDLC film 100 presents an opaque fog state, the light emitted from the light emitting device 400 passes through the light guide plate 200, the light traveling direction changes, and the light coming out from the light guide plate 200 passes through the PDLC film 100, due to the characteristics of the PDLC film 100 (a large number of rod-shaped liquid crystal particles exist in the polymer liquid crystal layer 140), the light is reflected for many times to uniformly diffuse in the whole plane, and in this way, the point light source is converted into a surface light source, so the dimmable backlight module can be used as a backlight source.

Specifically, when the LED power supply 500 is not powered on and the PDLC film power supply 300 is powered on, the backlight module assumes a transparent state; when the LED power supply 500 is not electrified and the PDLC film power supply 300 is not electrified, the backlight module shows a fog state, and the fog state and the transparent state can be flexibly converted, so that the dimmable backlight module can meet the requirements of electronic curtains in the fields of skylights, panoramic canopies, glass curtain walls and the like in the automobile industry; when the PDLC film power supply 300 is not powered on and the LED power supply 500 is powered on, the PDLC film 100 is in an opaque fog state, light emitted from the light emitting element 400 on the side surface is acted by the light guide plate 200, the light traveling direction is changed, when the light emitted from the light guide plate 200 passes through the PDLC film 100, because the liquid crystal layer liquid crystal molecule optical axis is in a disordered and disordered arrangement state, the light is reflected for many times so that the light is uniformly diffused in the whole PDLC film 100, and in such a way, the point light source is converted into a surface light source, so the dimmable backlight module can be used as a backlight light source.

The PDLC film 100 is used in this embodiment; the PDLC film 100 has a diffusion sheet function, and also changes the exit angle of incident light on the premise of ensuring high light transmittance, so that the light is refracted and scattered when reaching an effective light emitting surface, thereby obtaining a good light diffusion effect. The material is characterized in that the high light transmittance enables light rays to penetrate through the plate as much as possible to reach the effective light emitting surface, the light rays are prevented from being reflected and absorbed, and a white and bright foggy turbid appearance is formed on the effective light emitting surface, so that the light efficiency is improved, and the energy consumption is reduced.

In addition, the PDLC film 100 has its own advantages that since the positive type liquid crystal having a value of dielectric anisotropy (Δ ∈) larger than zero itself exhibits a disordered arrangement of liquid crystal molecules when no electric field (Off state) is applied, multiple scattering occurs when incident light passes through the PDLC film 100, and the display element assumes an opaque state; when an electric field (On state) is applied, liquid crystal molecules are arranged in parallel along the direction of the electric field, no is np, incident light smoothly passes through the PDLC film 100, and the element is in a transparent state; based on such facts, the application field of the backlight module including the PDLC film 100 can be expanded to the fields of skylights, panoramic canopies, glass curtain walls, and the like in the automobile industry.

Specifically, the electrode side 110 is electrically connected to the PDLC film power supply 300 through a first wire; the light emitting member 400 is electrically connected to the LED power supply 500 through a second wire.

Further, as shown in fig. 3, the PDLC film 100 includes a first base layer 120, a first conductive layer 130, a polymer liquid crystal layer 140, a second conductive layer 150, and a second base layer 160, which are sequentially disposed.

In this embodiment, the first substrate layer 120 and the second substrate layer 160 are both PET layers; the first conductive layer 130 and the second conductive layer 150 are ITO layers.

In the conventional LED backlight module, the diffusion sheet contains many granular objects, so that the light received by the light guide plate can be diffused, and the diffused light is more uniform. In this embodiment, the intermediate layer (polymer liquid crystal layer 140) of the PDLC film 100 is composed of a plurality of particle-like polymer-liquid crystals, and this liquid crystal layer can effectively diffuse the light emitted from the light guide plate 200. In addition, when no electricity is applied, the optical axes of the liquid crystal molecules are in a disordered and disordered alignment state, and the entire PDLC film 100 is optically in a foggy state. When the PDLC film 100 is powered, the optical axis directions of the nematic liquid crystal molecules in the PDLC film 100 are uniformly along the electric field direction, the ordinary refractive index of the liquid crystal particles is matched with the refractive index of the matrix to a certain degree, and light can penetrate through the matrix and become transparent.

In this embodiment, the light guide plate 200 is manufactured by laser etching or UV screen printing.

Optionally, the light guide plate 200 is made of PC, PMMA, or silica glass.

In this embodiment, the light emitting member 400 is an LED strip; the LED lamp belts are arranged into a group, and the group of LED lamp belts are arranged on one side of the light guide plate 200; or, the two groups of LED strips are respectively installed on two opposite sides of the light guide plate 200.

The two groups of LED lamp belts are connected with an LED power supply 500; the light guide plate 200 and the two groups of LED strips form a light source portion of the dimmable backlight module.

As shown in fig. 1 or fig. 2, the dimmable backlight module further includes an outer frame 600; the periphery of the light guide plate 200 is mounted on the outer frame 600, and the above components are mounted on the outer frame with supporting and protecting functions after being combined together, so that the dimmable backlight module can be conveniently disassembled and used.

Alternatively, the outer frame 600 may be an aluminum alloy frame.

Further, as shown in fig. 2, an optical plate 700 is disposed on a side of the PDLC film 100 away from the light guide plate 200, and the periphery of the optical plate 700 is mounted on the outer frame 600, and the optical plate 700 can protect the PDLC film 100.

Optionally, the optical plate 700 may be made of PC, PMMA or silica glass.

In other embodiments, referring to fig. 5, an optical plate 700 is disposed on a side of the PDLC film 100 facing away from the light guide plate 200; the thermal adhesive layers 800 are respectively bonded between the PDLC film 100 and the light guide plate 200 and between the PDLC film 100 and the optical plate 700, and the PDLC film 100, the light guide plate 200, the optical plate 700 and the two thermal adhesive layers 800 form a wumingzhi structure.

The hot melt adhesive layer 800 may be any one of PVE (Polyvinyl chloride), PVB (Polyvinyl butyral), EVA (Ethylene Vinyl Acetate), or PU (polyurethane).

Example two

The embodiment also provides a backlight display device, which comprises the dimmable backlight module. The backlight display device provided by the embodiment comprises the dimmable backlight module, and therefore, the beneficial effects and technical advantages which can be achieved by the backlight display device also comprise the beneficial effects and technical advantages which can be achieved by the dimmable backlight module, and are not repeated herein.

The backlight display device can be a liquid crystal display television, a skylight of the automobile industry, a panoramic awning and a glass curtain wall.

Comparative example 1

This comparative example provides a backlight unit can adjust luminance, and the difference with embodiment one lies in: the PDLC film 100 is replaced with a diffusion film.

Comparative example No. two

This comparative example provides a backlight unit can adjust luminance, and the difference with embodiment one lies in: both PDLC film and diffusion film were omitted.

In order to compare the technical effects achieved by the examples and comparative examples, the following experimental examples were specifically designed.

Experimental example 1

The thickness and sampling points of the films or light guide plates used in example 1 and comparative examples 1-2 were recorded, and three structures of "light guide plate + PDLC", light guide plate + diffusion film "and" light guide plate "were tested using a" taiwan shi TES-1335 digital illuminometer, respectively, the PDLC light-adjusting film liquid crystal coating thickness was 9um and 13um, the diffusion film material was PC, PMMA, PS (Polystyrene ) in order, and the illuminance was measured.

Selecting 9 points on the surface of the plate-shaped structure, measuring the illuminance, wherein the schematic diagram of the test area is shown in FIG. 4; the results of the measurement are shown in table 1:

as can be seen from the data in table 1, under the same experimental conditions, the front and rear light uniformity of the PDLC film 13um is better than that of the PDLC film 9um, and the diffusion film PMMA is better than that of the diffusion film PC than that of the diffusion film PS.

In summary, the dimmable backlight module of the embodiment has the following advantages:

1. the PDLC film 100 has the ability to diffuse light and may be substituted for a diffuser film.

2. The PDLC film 100 is more uniform in light irradiation as the liquid crystal thickness is thicker.

3. The backlight module containing the PDLC film 100 has the capability of flexibly converting a transparent state, a fog state and a backlight source state, so that the backlight module can be applied to the fields of skylights, panoramic canopies, glass curtain walls and the like in the automobile industry.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A dimmable backlight module, comprising: a dimming component and a light source component;

the dimming assembly comprises a PDLC film (100), a light guide plate (200) and a PDLC film power supply (300), the PDLC film (100) is attached to one side of the light guide plate (200), the PDLC film (100) has an electrode side (110), and the electrode side (110) is electrically connected with the PDLC film power supply (300);

the light source assembly comprises a light emitting member (400) and an LED power supply (500), wherein the light emitting member (400) is installed on one side or both sides of the light guide plate (200), and the light emitting member (400) is electrically connected with the LED power supply (500);

according to the power-on and power-off states of the PDLC film power supply (300) and the LED power supply (500), the dimmable backlight module can be switched among a transparent state, a fog state and a backlight source state.

2. A dimmable backlight module according to claim 1, wherein said PDLC film (100) comprises a first substrate layer (120), a first conductive layer (130), a polymer liquid crystal layer (140), a second conductive layer (150) and a second substrate layer (160) arranged in sequence.

3. A dimmable backlight module according to claim 2, wherein said first substrate layer (120) and said second substrate layer (160) are both PET layers;

the first conducting layer (130) and the second conducting layer (150) both adopt ITO layers.

4. A dimmable backlight module according to claim 1, wherein said light guide plate (200) is fabricated by laser etching or UV screen printing; and/or the material of the light guide plate (200) is PC, PMMA or silicon dioxide glass.

5. A dimmable backlight module according to claim 1, wherein said light emitting element (400) is an LED strip;

the LED lamp belts are arranged into a group, and the group of LED lamp belts are arranged on one side of the light guide plate (200); or the LED lamp belts are arranged into two groups, and the two groups of LED lamp belts are respectively arranged on two opposite sides of the light guide plate (200).

6. A dimmable backlight module according to any of claims 1 to 5, further comprising a bezel (600);

the periphery of the light guide plate (200) is mounted on the outer frame (600).

7. A dimmable backlight module according to claim 6, wherein an optical plate (700) is disposed on a side of the PDLC film (100) facing away from the light guide plate (200), and the periphery of the optical plate (700) is mounted on the outer frame (600).

8. A dimmable backlight module according to claim 7, wherein said optical plate (700) is made of PC, PMMA or silica glass.

9. A dimmable backlight module according to claim 1, wherein an optical plate (700) is disposed on a side of said PDLC film (100) facing away from said light guide plate (200);

the PDLC membrane (100) with all laminate hot melt adhesive layer (800) between light guide plate (200) and PDLC membrane (100) with between optical plate (700), PDLC membrane (100), light guide plate (200), optical plate (700) and two-layer hot melt adhesive layer (800) form five mingming structure.

10. A backlight display device, comprising: the dimmable backlight module of any of claims 1 to 9, wherein the backlight module is a single-chip module.

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