Backlight module, double-sided display panel and display device

Abstract

The embodiment of the utility model provides a backlight module, a double-sided display panel and a display device. The backlight module comprises a transparent substrate; the light-emitting unit is arranged on one side of the transparent substrate, and the light-emitting unit comprises a plurality of sub-millimeter light-emitting diodes; the diffusion layer is arranged on one side, far away from the transparent substrate, of the light emitting unit; the reflecting layer is arranged on the side, away from the light-emitting unit, of the diffusion layer, and the diffusion layer and the reflecting layer can enable light emitted by the light-emitting unit to be transmitted out towards the two sides away from the transparent substrate. Therefore, the light emitted by the light emitting unit is diffused and reflected through the diffusion layer and the reflecting layer, the backlight module can simply and conveniently realize double-sided light transmission, then the display panel using the backlight module can realize double-sided display only by using one backlight module, and the display panel is relatively small in thickness, relatively low in cost and good in display performance.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a backlight module, a double-sided display panel and a display device. Background Art

[0002] Sub-millimeter LEDs (Mini LEDs) are a new type of LED display technology derived from small-pitch light-emitting diodes (LEDs). The size of sub-millimeter LEDs is between mature LEDs and micro LEDs, about hundreds of microns. Sub-millimeter LEDs have color saturation, response speed, and smaller size that surpass mature LEDs. Compared with micro LEDs, they are easier to manufacture, so they are gradually becoming a common light source choice for display devices. Existing sub-millimeter LEDs are mostly single-sided, and it is difficult to achieve double-sided emission.

[0003] However, current backlight modules, double-sided display panels and display devices still need to be improved. Utility Model Content

[0004] The embodiments of the present disclosure provide a backlight module, a double-sided display panel and a display device to solve or alleviate one or more technical problems in the related art.

[0005] As a first aspect of an embodiment of the present disclosure, an embodiment of the present disclosure provides a backlight module, which includes: a transparent substrate; a light-emitting unit, which is arranged on one side of the transparent substrate, and the light-emitting unit includes a plurality of sub-millimeter light-emitting diodes; a diffusion layer, which is arranged on a side of the light-emitting unit away from the transparent substrate; and a reflective layer, which is arranged on a side of the diffusion layer away from the light-emitting unit, and the diffusion layer and the reflective layer can allow the light emitted by the light-emitting unit to pass through to both sides away from the transparent substrate.

[0006] In a possible implementation, the transparent substrate includes a transparent glass substrate, the backlight module further includes a backlight flexible circuit board, and the backlight flexible circuit board is electrically connected to the light-emitting unit.

[0007] In a possible embodiment, a plurality of the sub-millimeter light-emitting diodes are arranged in an array on one side of the transparent substrate, and the diffusion layer includes a transparent adhesive layer and diffusion particles. The transparent adhesive layer is arranged on a side of the sub-millimeter light-emitting diode away from the transparent substrate and on a side of the transparent substrate facing the sub-millimeter light-emitting diode, and the diffusion particles are dispersed in the transparent adhesive layer.

[0008] In a possible implementation, the material forming the diffusion particles includes silicon dioxide, the particle size of the diffusion particles is 3 to 5 um, and the content of the diffusion particles in the transparent adhesive layer is 1% to 30%.

[0009] In a possible implementation, the reflective layer includes a reflective adhesive layer and reflective particles, the material forming the reflective particles includes titanium dioxide, the particle size of the reflective particles is 200 to 400 nm, and the content of the reflective particles in the reflective adhesive layer is 20% to 40%.

[0010] As a second aspect of the embodiments of the present disclosure, the embodiments of the present disclosure provide a double-sided display panel, which includes: the backlight module described in any of the preceding items; a first display panel, which is arranged on one side of the backlight module; a second display panel, which is arranged on a side of the backlight module away from the first display panel; and a driving board, which is electrically connected to the backlight module, the first display panel, and the second display panel.

[0011] In a possible embodiment, the double-sided display panel further includes: a first film layer, which is arranged between the backlight module and the first display panel, and the first film layer includes at least one of a first color conversion film, a first brightness enhancement film, and a first diffusion film; a second film layer, which is arranged between the backlight module and the second display panel, and the second film layer includes at least one of a second color conversion film, a second brightness enhancement film, and a second diffusion film.

[0012] In a possible implementation, the first display panel includes a first flexible circuit board, the second display panel includes a second flexible circuit board, the backlight module includes the backlight flexible circuit board, the double-sided display panel further includes a connector, the first flexible circuit board is bound to the driving board, and the second flexible circuit board and the backlight flexible circuit board are plugged into the driving board via the connector.

[0013] In a possible implementation, the double-sided display panel further includes: a fixing tape, which is arranged at the periphery of the double-sided display panel, and fixes the first display panel, the second display panel and the backlight module together.

[0014] As a third aspect of an embodiment of the present disclosure, an embodiment of the present disclosure provides a display device, which includes the double-sided display panel as described in any one of the above items.

[0015] According to the technology of the present application, the light emitted by the light-emitting unit is diffused and reflected by the diffusion layer and the reflection layer, and the backlight module can easily achieve double-sided light transmission, and then the display panel using the backlight module can achieve double-sided display with only one backlight module. The display panel has a small thickness, low cost, and good display performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments according to the present disclosure and should not be regarded as limiting the scope of the present disclosure.

[0017] Figure 1 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure;

[0018] Figure 2 is a schematic diagram of a top view of a portion of a backlight module according to an embodiment of the present disclosure;

[0019] Figure 3 is a structural schematic diagram of a backlight module according to another embodiment of the present disclosure;

[0020] Figure 4 is a schematic structural diagram of a double-sided display panel according to an embodiment of the present disclosure;

[0021] Figure 5 is a schematic structural diagram of a double-sided display panel according to another embodiment of the present disclosure;

[0022] Figure 6 is a schematic structural diagram of a double-sided display panel according to another embodiment of the present disclosure;

[0023] Figure 7 FIG. 4 is a schematic structural diagram of a double-sided display panel according to another embodiment of the present disclosure.

[0024] Description of reference numerals:

[0025] 1000: backlight module; 100: transparent substrate; 200: light-emitting unit; 210: sub-millimeter light-emitting diode; 300: diffusion layer; 310: transparent adhesive layer: 320: diffusion particles; 400: reflection layer; 410: reflection adhesive layer; 420: reflection particles; 500: backlight flexible circuit board; 10000: double-sided display panel; 2000: first display panel; 3000: second display panel; 4000: driving board; 5000: first film layer; 5100: first color conversion film; 5200: first brightness enhancement film; 5300: first diffusion film; 6000: second film layer; 6100: second color conversion film; 6200: second brightness enhancement film; 6300: second diffusion film; 7000: fixing tape. DETAILED DESCRIPTION

[0026] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure, and different embodiments may be combined arbitrarily without conflict. Therefore, the drawings and descriptions are considered to be illustrative in nature and not restrictive.

[0027] As a first aspect of the embodiments of the present disclosure, the embodiments of the present disclosure provide a backlight module, referring to Figure 1 The backlight module 1000 includes: a transparent substrate 100, a light emitting unit 200, a diffusion layer 300 and a reflection layer 400, wherein the light emitting unit 200 is arranged on one side of the transparent substrate 100, the light emitting unit 200 includes a plurality of sub-millimeter light emitting diodes 210, the diffusion layer 300 is arranged on a side of the light emitting unit 200 away from the transparent substrate 100, and the reflection layer 400 is arranged on a side of the diffusion layer 300 away from the light emitting unit 200, and the diffusion layer 300 and the reflection layer 200 can make the light emitted by the light emitting unit 200 pass through to the two sides away from the transparent substrate 100 (refer to Figure 1 Thus, the light emitted by the light emitting unit 200 is diffused and reflected by the diffusion layer 300 and the reflection layer 400, and the backlight module 1000 can easily achieve double-sided light transmission, and then the display panel using the backlight module 1000 can achieve double-sided display with only one backlight module 1000, and the display panel has a small thickness, low cost, and good display performance.

[0028] The following is a detailed description of the principle by which the backlight module 1000 according to the embodiment of the present application can achieve the above-mentioned beneficial effects: The applicant has found that in existing sub-millimeter light-emitting diode (Mini LED) products, in order to improve the utilization rate of light, a high-reflective ink is usually applied to the light-emitting surface of the light-emitting diode (LED) or a reflective sheet is pasted to increase the brightness. Therefore, the existing sub-millimeter light-emitting diode (Mini LED) is mostly single-sided, and it is impossible to achieve simultaneous light emission and display on the front / back sides, and the performance of use is relatively limited. In the present application, a transparent substrate (such as a transparent glass substrate) is used as a substrate of a sub-millimeter light-emitting diode backlight module, and the light-splitting properties of a diffusion layer and a reflective layer are used to simply realize light transmission on both the front and back sides, and then a backlight module can be used to realize double-sided display on both the front and back sides, and the display panel is thin, the cost is low, and the display performance is good.

[0029] In a possible implementation manner, the transparent substrate 100 includes a transparent glass substrate, so that light can be transmitted from both sides of the transparent substrate 100 .

[0030] In one possible implementation, reference Figure 2 The backlight module 1000 further includes a backlight flexible circuit board 500, which is electrically connected to the light-emitting unit 200, so that the backlight flexible circuit board 500 can supply power to the sub-millimeter light-emitting diode 210, thereby controlling the sub-millimeter light-emitting diode 210 to emit light and display. In a possible implementation, a plurality of sub-millimeter light-emitting diodes 210 can be arranged in an array on one side of the transparent substrate 100.

[0031] In one possible implementation, reference Figure 3 The diffusion layer 300 may include a transparent adhesive layer 310 and diffusion particles 320. Specifically, the transparent adhesive layer 310 is disposed on a side of the sub-millimeter light emitting diode 210 away from the transparent substrate 100 and a side of the transparent substrate 100 facing the sub-millimeter light emitting diode 210. The diffusion particles 320 are dispersed in the transparent adhesive layer 310. Thus, the diffusion particles 320 can diffuse the light emitted by the sub-millimeter light emitting diode 210 in all directions (refer to Figure 3 In the direction of the dashed arrow in the middle, part of the light can be transmitted from the side of the transparent substrate 100 close to the diffusion layer 300 (ie, transmitted from the front side), and part of the light can be transmitted from the side of the transparent substrate 100 away from the diffusion layer 300 (ie, transmitted from the back side).

[0032] In a possible implementation, the material forming the diffusion particles 320 includes silicon dioxide, the particle size of the diffusion particles 320 is 3 to 5 um, and the content of the diffusion particles 320 in the transparent adhesive layer 310 is 1% to 30%. The shape of the diffusion particles 320 can be spherical or approximately spherical. Therefore, by controlling the particle size and content of the diffusion particles 320, the amount of light emitted by the light-emitting unit 200 from both sides of the transparent substrate 100 can be easily adjusted, thereby easily adjusting the light output and display performance of the front and back sides.

[0033] In one possible implementation, reference Figure 3 The reflective layer 400 includes a reflective adhesive layer 410 and reflective particles 420, whereby the reflective particles 420 can reflect the light emitted from the sub-millimeter light emitting diode 210 diffused by the diffusion layer 300 again (refer to Figure 3 In the direction of the dashed arrow in the middle, part of the light can be transmitted from the side of the transparent substrate 100 close to the reflective layer 400 (ie, transmitted from the front side), and part of the light can be transmitted from the side of the transparent substrate 100 away from the reflective layer 400 (ie, transmitted from the back side).

[0034] In a possible implementation, the material forming the reflective particles 420 includes titanium dioxide, the particle size of the reflective particles 420 is 200 to 400 nm, and the content of the reflective particles 420 in the reflective adhesive layer 410 is 20% to 40%.

[0035] Preferably, the particle size of the reflective particles 420 may be 250 to 350 nm, and more preferably, the particle size of the reflective particles 420 may be 300 nm.

[0036] Therefore, by controlling the particle size and content of the reflective particles 420, the amount of light emitted by the light-emitting unit 200 transmitted from both sides of the transparent substrate 100 can be easily adjusted, thereby easily adjusting the light output and display performance on both sides.

[0037] That is to say, when the light unit 200 is supplied with current through the backlight driving circuit board 500 to drive the sub-millimeter light emitting diode 210 to emit light, after the light emitted by the sub-millimeter light emitting diode 210 passes through the diffusion layer 300, part of the light will be scattered by the diffusion particles 320. At this time, part of the light will be scattered toward the side of the transparent substrate 100 away from the reflective layer 400, and the rest of the light will continue to be emitted to the reflective layer 400 toward the side of the transparent substrate 100 close to the reflective layer 400. The reflective adhesive layer 400 contains reflective particles 420. When the light passes through the reflective particles 420, the light will be reflected back, and the light without the reflective particles 420 will continue to be emitted toward the side of the transparent substrate 100 close to the reflective layer 400. Therefore, by adjusting the content of the diffusion particles 320 in the diffusion layer 300 and the content of the reflective particles 420 in the reflective adhesive layer 400, the intensity of the light emitted to the front side and the light emitted to the back side can be adjusted. Since the transparent substrate 100 is light-transmissive, the diffused and reflected light can continue to pass through the transparent substrate 100 and be emitted in a direction away from the reflective layer 400, so the backlight module 1000 can achieve a double-sided luminous effect. Specifically, the double-sided light can achieve double-sided display after passing through the display panels on both sides.

[0038] As a second aspect of the embodiments of the present disclosure, the embodiments of the present disclosure provide a double-sided display panel, referring to Figure 4 , the double-sided display panel 10000 comprises: the backlight module 1000 described in any of the above items, the first display panel 2000, the second display panel 3000 and the driving board 4000, wherein the first display panel 2000 is arranged on one side of the backlight module 1000, the second display panel 3000 is arranged on the side of the backlight module 1000 away from the first display panel 2000, and the driving board 4000 is electrically connected to the backlight module 1000, the first display panel 2000 and the second display panel 3000. Therefore, the double-sided display panel 10000 has all the features and advantages of the backlight module 1000 described above, which will not be repeated here. In general, the double-sided display panel 10000 can achieve double-sided display with only one backlight module 1000, and the double-sided display panel 10000 has a small thickness, low cost, and good display performance.

[0039] In one possible implementation, reference Figure 5 The double-sided display panel 10000 further includes: a first film layer 5000 and a second film layer 6000, wherein the first film layer 5000 is disposed between the backlight module 1000 and the first display panel 2000, and the second film layer 6000 is disposed between the backlight module 1000 and the second display panel 3000. Specifically, refer to Figure 6The first film layer 5000 may include at least one of a first color conversion film 5100, a first brightness enhancement film 5200, and a first diffusion film 5300; the second film layer 6000 may include at least one of a second color conversion film 6100, a second brightness enhancement film 6200, and a second diffusion film 6300. Thus, the light transmitted from the backlight module 1000 may be adjusted by the first film layer 5000 and the second film layer 6000, further improving the display performance and display effect of the first display panel 2000 and the second display panel 3000.

[0040] In a possible implementation, the first display panel 2000 may include a first flexible circuit board (not shown in the figure), the second display panel 3000 includes a second flexible circuit board (not shown in the figure), the backlight module 1000 includes a backlight flexible circuit board (not shown in the figure), and the double-sided display panel 10000 may further include a connector (not shown in the figure). Specifically, the first flexible circuit board may be directly bound to the driving board 4000, and the second flexible circuit board and the backlight flexible circuit board may be plugged into the driving board 4000 through the connector. Thus, the driving control of the backlight module 1000, the first display panel 2000, and the second display panel 3000 can be realized through one driving board 4000.

[0041] In one possible implementation, reference Figure 7 The double-sided display panel 10000 may further include a fixing tape 7000. Specifically, the fixing tape 70000 may be disposed on the periphery of the double-sided display panel 10000. The fixing tape 7000 may fix the first display panel 2000, the second display panel 3000 and the backlight module 1000 together.

[0042] As a third aspect of the embodiments of the present disclosure, the embodiments of the present disclosure provide a display device, the display device comprising any of the double-sided display panels described above. Thus, the display device has all the features and advantages of the double-sided display panels described above, which will not be described in detail here. In general, the display device can achieve double-sided display with only one backlight module, the display device has a small thickness, low cost, and good display performance.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] In the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0045] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] The disclosure above provides many different embodiments or examples to implement different structures of the present disclosure. In order to simplify the present disclosure, the components and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present disclosure. In addition, the present disclosure can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0047] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A backlight module, characterized in that: include: Transparent substrate; A light emitting unit, the light emitting unit is arranged on one side of the transparent substrate, and the light emitting unit includes a plurality of sub-millimeter light emitting diodes; A diffusion layer, wherein the diffusion layer is arranged on a side of the light emitting unit away from the transparent substrate; A reflective layer is arranged on a side of the diffusion layer away from the light-emitting unit. The diffusion layer and the reflective layer can allow the light emitted by the light-emitting unit to be transmitted to two sides away from the transparent substrate.

2. The backlight module according to claim 1, characterized in that: The transparent substrate includes a transparent glass substrate, and the backlight module further includes a backlight flexible circuit board, and the backlight flexible circuit board is electrically connected to the light-emitting unit.

3. The backlight module according to claim 1, characterized in that: A plurality of sub-millimeter light-emitting diodes are arranged in an array on one side of the transparent substrate. The diffusion layer includes a transparent adhesive layer and diffusion particles. The transparent adhesive layer is arranged on a side of the sub-millimeter light-emitting diode away from the transparent substrate and on a side of the transparent substrate facing the sub-millimeter light-emitting diode. The diffusion particles are dispersed in the transparent adhesive layer.

4. The backlight module according to claim 3, characterized in that: The material forming the diffusion particles includes silicon dioxide, the particle size of the diffusion particles is 3 to 5 um, and the content of the diffusion particles in the transparent adhesive layer is 1% to 30%.

5. The backlight module according to claim 1, characterized in that: The reflective layer includes a reflective adhesive layer and reflective particles. The material forming the reflective particles includes titanium dioxide. The particle size of the reflective particles is 200 to 400 nm. The content of the reflective particles in the reflective adhesive layer is 20% to 40%.

6. A double-sided display panel, characterized in that: include: The backlight module according to any one of claims 1 to 5; A first display panel, wherein the first display panel is arranged on one side of the backlight module; a second display panel, the second display panel being arranged on a side of the backlight module away from the first display panel; A driving board is electrically connected to the backlight module, the first display panel, and the second display panel.

7. The double-sided display panel according to claim 6, characterized in that: Further including: A first film layer, wherein the first film layer is disposed between the backlight module and the first display panel, and the first film layer includes at least one of a first color conversion film, a first brightness enhancement film, and a first diffusion film; The second film layer is arranged between the backlight module and the second display panel, and the second film layer includes at least one of a second color conversion film, a second brightness enhancement film, and a second diffusion film.

8. The double-sided display panel according to claim 6, characterized in that: The first display panel includes a first flexible circuit board, the second display panel includes a second flexible circuit board, the backlight module includes a backlight flexible circuit board, and the double-sided display panel further includes a connector. The first flexible circuit board is bound to the driving board, and the second flexible circuit board and the backlight flexible circuit board are plugged into the driving board through the connector.

9. The double-sided display panel according to claim 6, wherein: Further including: A fixing tape is arranged on the periphery of the double-sided display panel, and the fixing tape fixes the first display panel, the second display panel and the backlight module together.

10. A display device, characterized in that: A double-sided display panel comprising any one of claims 6 to 9.

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