CN214669965U - Transparent display device and backlight module thereof - Google Patents

Abstract

The application discloses transparent display device and backlight module thereof, transparent display device includes interval and relative display panel and backlight module who sets up, the play plain noodles of display panel is equipped with outer polaroid, backlight module provides polarized light for display panel, backlight module includes reflector plate, backlight, light guide plate, optics diaphragm and polarizer, the backlight sets up in reflector plate orientation one side of display panel, the backlight is straight following formula light source, and local brightness is adjustable in the backlight; the light guide plate is arranged on one side, facing the display panel, of the backlight source, the optical diaphragm is arranged on one side, facing the display panel, of the light guide plate, and the polarizer is arranged on one side, facing the display panel, of the optical diaphragm and converts light emitted by the backlight source into polarized light. By means of the design, the technical problem that the contrast of the transparent display device is low can be solved.

Description

Transparent display device and backlight module thereof

Technical Field

The application relates to the technical field of display, in particular to a transparent display device and a backlight module thereof.

Background

The transparent display device is a display device with a certain degree of penetrability and capable of displaying the background behind the picture, and is suitable for building and vehicle windows and shop windows. Besides the original display function, the device is more provided with future display features such as information provision and the like, so that the device is attracted by market attention to replace part of the market using common displays in the future, including architectural use, advertisement use, public use and the like, and the device drives the market of the integral display to grow. The transparent liquid crystal display screen has the characteristic of low cost due to the compatibility with the manufacturing process of the existing liquid crystal display screen, and becomes the mainstream of the current market.

The transparent display device has a low contrast ratio due to insufficient darkness in a dark state due to high transparency of the transparent display device.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a transparent display device with high contrast and a backlight module thereof.

The application discloses a transparent display device, including interval and relative display panel and backlight unit who sets up, the play plain noodles of display panel is equipped with outer polaroid, backlight unit provides polarized light for display panel, backlight unit includes reflector plate, backlight, light guide plate, optics diaphragm and polarizer, the backlight sets up in reflector plate orientation one side of display panel, the backlight is straight following formula light source, and local brightness is adjustable in the backlight; the light guide plate is arranged on one side, facing the display panel, of the backlight source, the optical diaphragm is arranged on one side, facing the display panel, of the light guide plate, and the polarizer is arranged on one side, facing the display panel, of the optical diaphragm and converts light emitted by the backlight source into polarized light.

Optionally, the backlight module includes an optical glass plate, the optical glass plate is disposed between the optical film and a polarizer, and the polarizer converts light passing through the optical glass plate into polarized light.

Optionally, the polarizer includes a polarizer or a metal grating.

Optionally, the display panel includes an array substrate and a color film substrate which are arranged in an opposite manner, and the array substrate is arranged between the color film substrate and the backlight module; the display panel also comprises a liquid crystal layer, the liquid crystal layer is arranged between the array substrate and the color film substrate, and the outer polarizer is arranged on one side of the color film substrate far away from the array substrate; the color film substrate comprises a first substrate, a color resistance layer, a plurality of hollowed color resistance positions and a plurality of black matrixes, wherein the color resistance layer is arranged on the first substrate and comprises color resistances of at least three different colors, and the color resistances of the different colors are arranged in a staggered manner; the plurality of hollow color resistor positions are respectively positioned between the adjacent color resistors, and the plurality of black matrixes are respectively arranged between the adjacent hollow color resistor positions and the color resistors.

Optionally, the cross-sectional area of the hollow color resistor position is the same as that of the color resistor; hollow color resistance positions are arranged between adjacent color resistances in the color resistance layer of each row; in each row of color resistance layers, hollow color resistance positions are also arranged between adjacent color resistances.

Optionally, the transparent display device includes a panel driver chip and a power control chip, and the panel driver chip is disposed on a side of the array substrate away from the color film substrate and drives the display panel; the power control chip is arranged on the backlight module and controls the backlight source, and the power control chip is communicated with the panel driving chip through an external data line.

Optionally, the transparent display device further includes a support pillar and a sealant disposed between the color film substrate and the array substrate, and the support pillar and the sealant are made of transparent materials.

Optionally, the transparent display device includes a first tray and a second tray, and the first tray is connected to the backlight module to fix the backlight module; the second tray is connected with the display panel and used for fixing the display panel; the first tray and the second tray are connected through a telescopic rod, and the distance between the first tray and the second tray can be adjusted by controlling the length of the telescopic rod.

Optionally, the distance between the display panel and the backlight module is 30-500 cm.

The application also discloses a backlight module in the display device, wherein the backlight module comprises a reflector plate, a backlight source, a light guide plate, an optical diaphragm, an optical glass plate and a polarizer, the backlight source is arranged on the reflector plate and is a direct-type light source, and the local brightness in the backlight source is adjustable; the light guide plate is arranged on one side, far away from the reflector plate, of the backlight source, the optical diaphragm is arranged on one side, far away from the reflector plate, of the light guide plate, the optical glass plate is arranged on one side, far away from the reflector plate, of the optical diaphragm, the polarizer is arranged on one side, far away from the reflector plate, of the optical glass plate, and the light emitted by the backlight source is converted into polarized light.

Compare in traditional liquid crystal display device, transparent display device's display panel and backlight module set up separately in this application, and the light that backlight unit sent is polarized light, and the external world does not receive backlight unit's influence when watching display content like this, also can not see the polarized light that backlight unit sent, can only follow the transparent display panel that each angle saw display frame to improve display effect. However, the transparency of the display panel in the transparent display device is high, so that the picture is not dark enough when a dark state is displayed, and the contrast of the picture is low; based on this, this application sets up the backlight as straight following formula light source, and uses local dimming technique to the backlight to can adjust the luminance of different regions in the display panel, make the picture when showing dark state, with the luminance of this region modulation down, improved the contrast effect with other regions, thereby improved the lower technical problem of transparent display device contrast.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic view of a display device;

fig. 2 is a schematic diagram of a transparent display device according to an embodiment of the present application;

FIG. 3 is a schematic plan view of a backlight module of the transparent display device of the present application;

FIG. 4 is a schematic cross-sectional view of a display panel of the transparent display apparatus of the present application;

fig. 5 is a schematic plan view of a color filter substrate;

fig. 6 is a schematic plan view of a color filter substrate according to an embodiment of the present disclosure;

FIG. 7 is a schematic view of another transparent display device provided in an embodiment of the present application;

fig. 8 is a schematic view of a backlight module according to another embodiment of the present application.

100, a transparent display device; 200. a display panel; 210. a color film substrate; 211. a first substrate; 212. a color resist layer; 2121. color resistance; 2122. red resistance; 2123. a green resistor; 2124. blue resistance; 213. hollowing out the color resistance position; 214. a black matrix; 215. a protective layer; 216. a common electrode layer; 217. a first alignment film; 220. an array substrate; 221. a second substrate; 222. an active switching layer; 223. an insulating layer; 224 a pixel electrode layer; 225. a second alignment film; 230. a liquid crystal layer; 240. a support pillar; 250. frame glue; 260. an outer polarizer; 270. an inner polarizer; 280. a panel driving chip; 290. a power supply control chip; 300. a backlight module; 310. a reflective sheet; 320. a backlight source; 330. a light guide plate; 340. an optical film; 350. an optical glass plate; 360. a polarizer; 361. a metal grating; 370. a light barrier; 410. a first tray; 420. a second tray; 430. a telescopic rod; 440. and the data line is externally connected.

Detailed Description

It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.

In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.

Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.

Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The present application will now be described in detail with reference to the drawings and alternative embodiments, it being understood that any combination of the various embodiments or technical features described below may form new embodiments without conflict.

As shown in fig. 1, the display device includes a display panel 200 and a backlight module 300, which are disposed in an attached manner, where the display panel 200 includes an array substrate 220 and a color filter substrate 210, the color filter substrate 210 includes a first substrate 211, a color resistance layer 212, a protective layer 215, a common electrode layer 216, and a first alignment film 217, which are sequentially stacked in a direction toward the array substrate 220, the array substrate 220 includes a second substrate 221, an active switch layer 222, an insulating layer 223, a pixel electrode layer 224, and a second alignment film 225, which are sequentially stacked in a direction toward the color filter substrate 210, the display panel 200 further includes a liquid crystal layer 230, a support pillar 240, a sealant 250, an inner polarizer 270, and an outer polarizer 260, the liquid crystal layer 230 and the support pillar 240 are disposed between the color filter substrate 210 and the array substrate 220, the polarizer 250 is disposed around the array substrate 220 and the color filter substrate 210, the liquid crystal layer 230 is sealed between the array substrate 220 and the color filter substrate 210, the inner polarizer 270 is attached to a side of the second substrate 221 away from the color filter substrate 210, and the outer polarizer 260 is attached to a side of the first substrate 211 away from the array substrate 220.

The backlight module 300 includes a reflective sheet 310, a light guide plate 330, and an optical film 340 stacked in sequence toward the display panel 200, and further includes a side-in backlight 320 and a light barrier 370 disposed at a side of the light guide plate 330, where the optical film 340 is disposed opposite to the inner polarizer 270 in the display panel 200. The display device further includes a driving chip, which is disposed on a side of the backlight module 300 away from the display panel 200, and is used for driving the display panel 200.

As shown in fig. 2, which is a schematic view of a transparent display device 100, different from fig. 1, light emitted from a backlight module 300 in the transparent display device 100 is polarized light, and a display panel 200 and the backlight module 300 in the transparent display device 100 are separately disposed, so that only the transparent display panel 200 displaying a picture can be seen from the outside. Specifically, the transparent display device 100 includes a display panel 200 and a backlight module 300 that are spaced and arranged oppositely, an external polarizer 260 is disposed on an outgoing surface of the display panel 200, the backlight module 300 faces an incoming surface of the display panel 200 and provides polarized light for the display panel 200, the backlight module 300 includes a reflector 310, a backlight source 320, a light guide plate 330, an optical film 340 and a polarizer 360, the backlight source 320 is disposed on one side of the reflector 310 facing the display panel 200, the backlight source 320 is a direct-type light source, and local brightness in the backlight source 320 is adjustable; the light guide plate 330 is disposed on a side of the backlight 320 facing the display panel 200, the optical film 340 is disposed on a side of the light guide plate 330 facing the display panel 200, and the polarizer 360 is disposed on a side of the optical film 340 facing the display panel 200 and converts light emitted from the backlight 320 into polarized light; the backlight module 300 further includes a light barrier 370, and the light barrier 370 is disposed at a side of the light guide plate 330 to prevent light in the backlight module 300 from leaking out from a side direction to cause light leakage.

Compared with the conventional liquid crystal display device, the display panel 200 and the backlight module 300 of the transparent display device 100 are separately arranged, and the light emitted by the backlight module 300 is polarized light, so that the outside is not affected by the backlight module 300 when viewing display content, the polarized light emitted by the backlight module 300 cannot be seen, the transparent display panel 200 displaying pictures can be seen from all angles, and the display effect is improved. However, since the transparency of the display panel 200 in the transparent display apparatus 100 is high, the picture is not dark enough when displaying a dark state, which results in a low contrast of the picture; based on this, in the present application, the backlight source 320 is set as a direct-type light source, and a local dimming technology (dividing an image signal into a plurality of regions, performing analysis and calculation according to the image brightness of each region, and then automatically controlling the brightness of the backlight source 320 of each region, so as to adjust the brightness of different regions in the display panel 200) is used for the backlight source 320, so that when a picture displays a dark state, the brightness of the region is reduced, the contrast effect with other regions is improved, and the technical problem of low contrast of the transparent display device 100 is solved.

In fig. 2, the backlight module 300 further includes an optical glass plate 350, the optical glass plate 350 is disposed between the optical film 340 and a polarizer 360, and the polarizer 360 converts the light passing through the optical glass plate 350 into polarized light. The optical glass plate 350 is made of an optical glass material, and compared with a common glass material, the optical glass has a higher light transmittance and a small loss to light emitted by the backlight source 320.

Because display panel 200 and backlight unit 300 among the transparent display device 100 are all independent settings, there is great interval between the two, consequently display panel 200 and backlight unit 300 all need separately protect, display panel 200's positive and negative all have the glass substrate to protect, backlight unit 300's the back has reflector plate 310 or backplate to protect, the front has optical glass plate 350 to protect, prevent the fish tail, collide the interior device in backlight unit 300, also prevent the dust, during steam enters into backlight unit 300, influence backlight unit 300's life.

Specifically, the distance between the display panel 200 and the backlight module 300 may be 30-500cm, because the distance is greater than 30cm to show the semitransparent effect of the display panel 200, and the distance less than 500cm is considered to be the influence of refraction and scattering of light emitted by the backlight 320, and if the distance is too long, the brightness of the backlight 320 is required to be too high to achieve the same display effect, so the maximum distance is limited.

In addition, the polarizer 360 includes a polarizer or a metal grating 361, and when the polarizer 360 is a polarizer, the polarizer may be attached to the optical glass plate 350 by using a conventional pressure sensitive adhesive, or a PVA layer (polyvinyl alcohol film) that deflects light may be directly attached to the surface layer of the optical glass plate 350 by attaching, and only the TAC layer (cellulose triacetate film) and the protective film are remained. As shown in fig. 3, which is a schematic plan view of a backlight module 300 including a metal grating 361, when the polarizer 360 is the metal grating 361, the metal grating 361 can be fabricated on the surface of the optical glass plate 350 by laser interference lithography or nano-imprint method.

With reference to fig. 2 and 4, the display panel 200 includes an array substrate 220 and a color filter substrate 210 which are oppositely disposed, and the array substrate 220 is disposed between the color filter substrate 210 and the backlight module 300; the color film substrate 210 comprises a first substrate 211, a color resistance layer 212, a protective layer 215, a common electrode layer 216 and a first alignment film 217 which are sequentially stacked towards the array substrate 220, the array substrate 220 comprises a second substrate 221, an active switch layer 222, an insulating layer 223, a pixel electrode layer 224 and a second alignment film 225 which are sequentially stacked towards the color film substrate 210, the display panel 200 further comprises a liquid crystal layer 230, a supporting column 240 and a sealant 250, the liquid crystal layer 230 and the supporting column 240 are arranged between the color film substrate 210 and the array substrate 220, the sealant 250 is arranged around the array substrate 220 and the color film substrate 210, the liquid crystal layer 230 is sealed between the array substrate 220 and the color film substrate 210, and the outer polarizer 260 is attached to one side of the first substrate 211 departing from the array substrate 220.

The sealant 250 and the supporting columns 240 are made of transparent materials, so that the transparency of the display panel 200 is increased, and the aesthetic effect is improved.

Moreover, the transparent display device 100 further includes a panel driving chip 280 and a power control chip 290, where the panel driving chip 280 is disposed on a side of the array substrate 220 away from the color filter substrate 210 to drive the display panel 200; the power control chip 290 is disposed on the backlight module 300 to control the backlight source 320, and the power control chip 290 is communicated with the panel driving chip 280 through an external data line 440. By implementing the panel driving circuit on the display panel 200, the wiring between the display panel 200 and the panel driving is reduced, and the overall aesthetic degree of the transparent display device 100 is improved. Furthermore, the Gate driving circuit in the panel control chip can be implemented on the Array substrate 220 to realize Gate Driver on Array (GOA) driving, thereby reducing the volume of the panel driving chip 280 and improving the aesthetic appearance.

Fig. 5 is a schematic plan view of the color filter substrate 210 in the display device of fig. 1, in fig. 5, the red resistors 2122, the green resistors 2123, and the blue resistors 2124 corresponding to each sub-pixel on the color filter substrate 210 are closely arranged, and they are divided by the black matrix 214; taking a 43-inch display as an example, in the display area (AA area), the aperture ratio of the color film substrate 210 is 72%, and the transmittance of RGB is about 36%; on the array substrate 220 side, except for a part of metal wires accounting for 20-30%, the transmittance of other regions can be considered to be more than 95%, so that the light transmittance is greatly reduced by the RGB design in the conventional color film substrate.

Fig. 6 is a schematic view of a plane of a color film substrate in the transparent display device 100 of fig. 4, the color film substrate 210 further includes a plurality of hollow color resistor locations 213, the plurality of hollow color resistor locations 213 are respectively located between adjacent color resistors 2121, that is, a hollow color resistor location 213 is located between adjacent red resistors 2122 and 2123, a hollow color resistor location 213 is located between adjacent green resistors 2123 and 2124, and a hollow color resistor location 213 is located between adjacent blue resistors 2124 and red resistors 2122; by reducing the density of the color resistors 2121 in the color filter substrate 210, the distance between the color resistors 2121 is increased, and the transparency and the light transmittance of the display panel 200 are improved. Of course, the color resist layer 212 in the present application may include color resists of four colors, such as red, green, blue, yellow or red, green, blue, white, and the hollow color resist portion 213 may also have a white color resist.

Compared with the color resistor 2121 arrangement and the pixel design in the prior art, the cross-sectional area of the hollowed-out color resistor position 213 is designed to be the same as that of the color resistor 2121; in the color resistance layer 212 of each row, a hollow color resistance position 213 is arranged between adjacent color resistances 2121; in the color resistance layer 212 of each row, a hollow color resistance position 213 is also arranged between the adjacent color resistances 2121; thereby reducing the pixel density of the AA region on the color filter substrate 210 by half. While also reducing the cross-sectional area of the black matrix 214 such that the coated area of the black matrix 214 is only half of the coated area of the prior art black matrix 214. Through the two designs for increasing the transparency of the display panel 200, the transparency of the display panel 200 in the transparent display device 100 can reach 29.5%, so that the transparency of the display panel 200 is greatly improved, and the display effect is improved.

As shown in fig. 2 and 7, the transparent display device 100 further includes a first tray 410 and a second tray 420, wherein the first tray 410 is connected to the backlight module 300 to fix the backlight module 300; the second tray 420 is connected to the display panel 200, and fixes the display panel 200; the first tray 410 and the second tray 420 are connected by a telescopic rod 430, and the distance between the first tray 410 and the second tray 420 can be adjusted by controlling the length of the telescopic rod 430.

Since the backlight module 300 and the display panel 200 are separately fixed, the backlight module 300 and the display panel 200 are conveniently moved by respectively fixing the backlight module 300 and the display panel on the first tray 410 and the second tray 420; the telescopic rod 430 is arranged between the first tray 410 and the second tray 420, so that the two trays can be limited, the two trays are prevented from being deviated left and right, and the backlight module 300 and the display panel 200 are ensured to be overlapped; therefore, the distance between the backlight module 300 and the display panel 200 can be conveniently adjusted, so that the use requirement can be better met.

In addition, the telescopic rod 430 may be hollow, and the external data line 440 may be connected to the telescopic rod 430, so as to enhance the overall aesthetic appearance of the transparent display device 100.

As shown in fig. 8, which is a schematic view of a backlight module 300, the present application further discloses a backlight module 300 in the display device, where the backlight module 300 includes a reflective sheet 310, a backlight source 320, a light guide plate 330, an optical film 340, an optical glass plate 350, and a polarizer 360, the backlight source 320 is disposed on the reflective sheet 310, the backlight source 320 is a direct-light type light source, and a local brightness in the backlight source 320 is adjustable; the light guide plate 330 is disposed on a side of the backlight source 320 far from the reflective sheet 310, the optical film 340 is disposed on a side of the light guide plate 330 far from the reflective sheet 310, the optical glass plate 350 is disposed on a side of the optical film 340 far from the reflective sheet 310, and the polarizer 360 is disposed on a side of the optical glass plate 350 far from the reflective sheet 310, and converts light emitted from the backlight source 320 into polarized light.

The backlight module 300 in the present application is an independent and complete structure, and can emit polarized light, and can also analyze and calculate brightness of images according to each area, and then automatically control brightness of backlight sources in each area, and the backlight module 300 in this embodiment can overcome the problem of too low contrast in a transparent liquid crystal display. It should be noted that the backlight module 300 in this embodiment may also be used with other different types of transparent liquid crystal displays to provide a backlight source for other types of transparent liquid crystal displays.

It should be noted that the inventive concept of the present application can form many embodiments, but the present application has a limited space and cannot be listed one by one, so that, on the premise of no conflict, any combination between the above-described embodiments or technical features can form a new embodiment, and after the embodiments or technical features are combined, the original technical effect will be enhanced.

The foregoing is a further description of the present application in connection with specific alternative embodiments, and the specific implementations of the present application are not to be considered as limited by these descriptions. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.

Claims (10)

1. A transparent display device, comprising:

the display panel is provided with an outer polaroid on a light emitting surface; and

the backlight module is spaced from and arranged opposite to the light incident surface of the display panel and provides polarized light for the display panel;

the backlight module includes:

a reflective sheet;

the backlight source is arranged on one side, facing the display panel, of the reflector plate, is a direct type light source, and has adjustable local brightness;

the light guide plate is arranged on one side, facing the display panel, of the backlight source;

the optical film is arranged on one side, facing the display panel, of the light guide plate; and

the polarizer is arranged on one side, facing the display panel, of the optical film and converts light emitted by the backlight source into polarized light.

2. The transparent display device of claim 1, wherein the backlight module comprises an optical glass plate disposed between the optical film sheet and a polarizer that converts light passing through the optical glass plate into polarized light.

3. The transparent display device of claim 2, wherein the polarizer comprises a polarizer or a metal grating.

4. The transparent display device according to claim 1, wherein the display panel comprises an array substrate and a color film substrate which are arranged in an opposite manner, and the array substrate is arranged between the color film substrate and the backlight module;

the display panel also comprises a liquid crystal layer, the liquid crystal layer is arranged between the array substrate and the color film substrate, and the outer polarizer is arranged on one side of the color film substrate far away from the array substrate;

the color film substrate comprises:

a first substrate;

the color resistance layer is arranged on the first substrate and comprises color resistances of at least three different colors, and the color resistances of the different colors are arranged in a staggered manner;

the plurality of hollow color resistor positions are respectively positioned between the adjacent color resistors; and

and the black matrixes are respectively arranged between the hollow color resistor positions and the color resistors adjacent to each other.

5. The transparent display device of claim 4, wherein the cross-sectional area of the hollowed-out color-resistor bit is the same as the cross-sectional area of the color resistor;

hollow color resistance positions are arranged between adjacent color resistances in the color resistance layer of each row; in each row of color resistance layers, hollow color resistance positions are also arranged between adjacent color resistances.

6. The transparent display device according to claim 4, wherein the transparent display device comprises a panel driver chip and a power control chip, the panel driver chip is disposed on a side of the array substrate away from the color filter substrate to drive the display panel;

the power control chip is arranged on the backlight module and controls the backlight source, and the power control chip is communicated with the panel driving chip through an external data line.

7. The transparent display device according to claim 4, further comprising a support pillar and a sealant disposed between the color film substrate and the array substrate, wherein the support pillar and the sealant are made of a transparent material.

8. The transparent display device of claim 1, wherein the transparent display device comprises a first tray and a second tray, the first tray is connected with the backlight module to fix the backlight module; the second tray is connected with the display panel and used for fixing the display panel;

the first tray and the second tray are connected through a telescopic rod, and the distance between the first tray and the second tray can be adjusted by controlling the length of the telescopic rod.

9. The transparent display device according to any one of claims 1-8, wherein the distance between the display panel and the backlight module is 30-500 cm.

10. A backlight module for a display device as claimed in any one of claims 1 to 9, wherein the backlight module comprises:

a reflective sheet;

the backlight source is arranged on the reflector plate and is a direct type light source, and the local brightness in the backlight source is adjustable;

the light guide plate is arranged on one side of the backlight source far away from the reflector plate;

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

an optical glass plate disposed on a side of the optical film away from the reflection sheet, an

The polarizer is arranged on one side, far away from the reflector plate, of the optical glass plate and converts light emitted by the backlight source into polarized light.

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