CN109307955B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN109307955B CN109307955B CN201811469399.2A CN201811469399A CN109307955B CN 109307955 B CN109307955 B CN 109307955B CN 201811469399 A CN201811469399 A CN 201811469399A CN 109307955 B CN109307955 B CN 109307955B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a backlight module and a display device, which relate to the technical field of display and comprise: a substrate; the LEDs are arranged on one side, facing the light emitting surface of the backlight module, of the substrate; the reflecting groove comprises a base and at least two extending parts connected with the end parts of the base, the extending parts are respectively adjacent to the LEDs, and the orthographic projection of the extending parts on the plane of the substrate is positioned between the base and the LEDs adjacent to the extending parts; and part of light emitted by the LED is emitted from the light emitting surface of the backlight module after being reflected by the reflecting groove. According to the scheme, the reflection groove is formed between at least two adjacent LEDs, and the quantity of light emitted from the two adjacent LEDs is increased by utilizing the reflection effect of the reflection groove, so that the brightness difference between the area where the LEDs are located and the area between the adjacent LEDs is favorably reduced, and the display effect of the display device is favorably improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
At present, the application permeability of the LED as a backlight source in the field of liquid crystal panel display already exceeds 90%. The backlight module mainly comprises an edge-in type LED backlight and a direct-down type LED backlight, wherein an LED light source is arranged on the side face of the light guide plate, and light emitted by the LED enters the light guide plate and is guided out through reflection and scattering of the reflecting sheet and the mesh points. The direct-type LED backlight is becoming the mainstream of the market because it can display images more accurately and exhibit excellent color and contrast effect.
The direct type LED backlight source module generally comprises a PCB, a plurality of packaged LED chips are arranged on the PCB, and light rays emitted by the LED chips irradiate onto an LCD display screen, so that the liquid crystal display device is illuminated.
Generally, in a direct type LED backlight module, a certain distance exists between adjacent LED chips, and when the LED backlight emits light, a dark phenomenon occurs due to no light-emitting body in the distance, so that the LED backlight exhibits a non-uniform brightness phenomenon, which affects the display effect of the display device.
Disclosure of Invention
In view of this, the present invention provides a backlight module and a display device, in which a reflective groove is disposed between at least two adjacent LEDs, and the reflective effect of the reflective groove is utilized to increase the amount of light emitted from the two adjacent LEDs, thereby reducing the brightness difference between the area where the LEDs are located and the area between the adjacent LEDs, and improving the display effect of the display device.
In a first aspect, the present application provides a backlight module, comprising:
a substrate;
the LEDs are arranged on one side, facing the light emitting surface of the backlight module, of the substrate;
the reflecting groove comprises a base and at least two extending parts connected with the end parts of the base, the extending parts are respectively adjacent to the LEDs, and the orthographic projection of the extending parts on the plane of the substrate is positioned between the base and the LEDs adjacent to the extending parts;
and part of light emitted by the LED is emitted from the light emitting surface of the backlight module after being reflected by the reflecting groove.
In a second aspect, the present application provides a display device, including a backlight module, where the backlight module is the backlight module provided by the present application.
Compared with the prior art, the backlight module and the display device provided by the invention at least realize the following beneficial effects:
the backlight module and the display device provided by the application comprise a substrate and a plurality of LEDs arranged on the substrate and facing the light-emitting surface of the backlight module, and particularly, at least one reflecting groove is introduced into the backlight module and is arranged between two adjacent LEDs. Because part of light emitted from the LEDs in the prior art cannot reach the light-emitting surface of the backlight module, the part of light is usually wasted, and the brightness of the area between the adjacent LEDs may be dark; and this application is after introducing the reflecting groove, in the light of following LED's the ejaculate, can follow the regional play plain noodles that corresponds between the adjacent LED after the reflex action via the reflecting groove from the direct play plain noodles that jets out from backlight unit's play plain noodles, thereby make the light that LED jetted out effectively utilize, the effective utilization ratio of the light source that LED sent has been promoted, the darker problem of luminance between the adjacent LED has also effectively been improved simultaneously, be favorable to the homogeneity of the light that backlight unit sent, thereby be favorable to improving display device's display effect.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a top view of a backlight module according to an embodiment of the present disclosure;
FIG. 2 is an AA' cross-sectional view of the backlight module shown in FIG. 1;
fig. 3 is a schematic light path diagram of a backlight module according to an embodiment of the present disclosure;
fig. 4 is another top view of a backlight module according to an embodiment of the present disclosure;
FIG. 5 is a cross-sectional view of a BB' of the backlight module shown in FIG. 4;
FIG. 6 is a cross-sectional view of an alternative AA' of the backlight module shown in FIG. 1;
fig. 7 is a cross-sectional view of a reflective groove in a backlight module according to an embodiment of the present disclosure;
fig. 8 is another cross-sectional view of a reflective groove in a backlight module according to an embodiment of the disclosure;
fig. 9 is a top view of a backlight module according to an embodiment of the disclosure;
fig. 10 is a schematic diagram illustrating another top view of the backlight module according to the embodiment of the present application, in which the LEDs are arranged in an array on the substrate
Fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;
fig. 12 is a cross-sectional view of a CC' of the display device provided in fig. 11.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
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, further discussion thereof is not required in subsequent figures.
In the prior art, the direct type LED backlight module generally includes a PCB, a plurality of encapsulated LED chips are disposed on the PCB, and light emitted from the LED chips irradiates the LCD display screen, thereby realizing the illumination effect of the liquid crystal display device.
In general, in a direct-type LED backlight, a certain distance exists between adjacent LEDs, and when the LED backlight emits light, a phenomenon of dimming occurs due to no light-emitting body in the distance, which results in a phenomenon of uneven brightness of the LED backlight, that is, brightness of a corresponding position of an LED is high, and brightness of an area between adjacent LEDs is low. When the LED does not emit light, the entire LED backlight is in a black state, and when the LED chips emit light, only the corresponding positions of the LED chips and the peripheral regions thereof emit light or have high brightness, while the partial regions between adjacent LED chips still exhibit a black state or have low brightness, so that the LED backlight emits light unevenly.
In view of this, the present invention provides a backlight module and a display device, in which a reflective groove is disposed between at least two adjacent LEDs, and the reflective effect of the reflective groove is utilized to increase the amount of light emitted from the two adjacent LEDs, thereby reducing the brightness difference between the area where the LEDs are located and the area between the adjacent LEDs, and improving the display effect of the display device.
The embodiment of the application provides a backlight module, include:
a substrate;
the LEDs are arranged on one side, facing the light emitting surface of the backlight module, of the substrate;
the reflecting groove comprises a base and at least two extending parts connected with the end parts of the base, the extending parts are respectively adjacent to the LEDs, and the orthographic projection of the extending parts on the plane of the substrate is positioned between the base and the LEDs adjacent to the extending parts;
and part of light emitted by the LED is emitted from the light emitting surface of the backlight module after being reflected by the reflecting groove.
The following detailed description is to be read in connection with the drawings and the detailed description.
Fig. 1 is a top view of a backlight module according to an embodiment of the present disclosure, fig. 2 is an AA' cross-sectional view of the backlight module shown in fig. 1, please refer to fig. 1 and fig. 2, a backlight module 100 according to an embodiment of the present disclosure includes a substrate 10, a plurality of LEDs 20 disposed on the substrate 10, and at least one reflective groove 30, the reflective groove 30 being disposed between adjacent LEDs 20; the reflective slot 30 comprises a base 31 and at least two extending portions 32 connected with the ends of the base 31, the extending portions 32 are respectively adjacent to the LEDs 20, and the orthographic projection of the extending portions 32 on the plane of the substrate 10 is positioned between the base 31 and the LEDs 20 adjacent to the extending portions 32; in particular, a part of the light emitted from the LED20 is reflected by the reflective groove 30 and then emitted from the light emitting surface of the backlight module 100. Referring to fig. 3, fig. 3 is a schematic diagram of an optical path of the backlight module 100 according to an embodiment of the present invention, after the reflection groove 30 is introduced between at least some adjacent LEDs 20, at least some of the light rays emitted from the LEDs 20 that are not directly emitted from the light emitting surface of the backlight module 100 (for example, the light rays emitted from the LEDs 20 that are reflected back through the film layer, such as the fluorescent film 80, on the side of the LED20 away from the substrate 10) are emitted to the reflection groove 30, and this portion of the light rays are reflected by the reflection groove 30 and emitted from the light emitting surface corresponding to the area between two adjacent LEDs 20, so as to increase the amount of the light rays emitted from the light emitting surface corresponding to the area between two adjacent LEDs 20, thereby improving the problem of dark luminance between adjacent LEDs 20, reducing the possibility of occurrence of luminance unevenness of the backlight module 100, and improving the uniformity of the light rays emitted from the LED20, the effective utilization rate of the light source emitted by the LED20 is also improved, so that when the backlight module 100 in the above embodiment is applied to a display device, the display effect of the display device is also improved.
It should be noted that the substrate 10 provided in the embodiment of the present application is provided with a circuit structure, which can provide power for the LED20, for example, the circuit structure may be an FPC substrate or a PCB substrate; the light emitting surface of the backlight module 100 mentioned in the present application is a surface parallel to the substrate 10 on the side of the LED20 away from the substrate. Optionally, the LED20 mentioned in this embodiment of the present application is in a rectangular parallelepiped structure or a square structure, or in a rectangular parallelepiped structure or a square-like structure, which is not specifically limited in this application. In addition, fig. 1 and 2 are merely schematic representations of one arrangement of LEDs 20 on substrate 10 and do not represent actual numbers or sizes.
In the embodiment shown in fig. 1 and fig. 2, only the reflective groove 30 is disposed between some adjacent LEDs 20 in the backlight module 100, and optionally, referring to fig. 4 and fig. 5, in the backlight module 100 provided in the embodiment of the present application, the reflective groove 30 is disposed between any two adjacent LEDs 20, where fig. 4 is another top view of the backlight module 100 provided in the embodiment of the present application, and fig. 5 is a BB' sectional view of the backlight module 100 in fig. 4.
Specifically, referring to fig. 4 and 5, in the embodiment, the reflective grooves 30 are disposed between any two adjacent LEDs 20, and the reflective grooves 30 reflect light rays emitted from the LEDs 20 that are not emitted from the light emitting surface of the backlight module 100, so that at least part of the light rays can be emitted from the light emitting surface corresponding to the region between two adjacent LEDs 20, and therefore, the amount of light rays emitted from the light emitting surface corresponding to the region between any two adjacent LEDs 20 is effectively increased, which is beneficial to reducing the brightness difference between the region between any two adjacent LEDs 20 and the region corresponding to the LED20, and improving the brightness uniformity of the backlight module 100 as a whole, and therefore, when the backlight module 100 in the embodiment is applied to a display device, the display effect of the display device is further improved.
Optionally, with continued reference to fig. 3, the backlight module 100 provided in the embodiment of the present application further includes a fluorescent film 80, and the fluorescent film 80 is located on a side of the LED20 away from the substrate 10.
Specifically, referring to fig. 3, when the fluorescent film 80 is introduced into the backlight module 100, the fluorescent films 80 with different colors cooperate with the LEDs 20 with different colors to make the light-emitting surface of the backlight module 100 emit white light. For example, a blue LED20 lamp and the phosphor film 80 doped with yellow phosphor powder can be used together to make the backlight module 100 emit white light; of course, in some other embodiments of the present application, the backlight module 100 may emit white light by using other colors of the LED20 and other colors of the fluorescent film 80, which is not particularly limited in this application. Most of the light emitted from the LEDs 20 passes through the phosphor film 80 and then emits (not shown in the figure), and a part of the light is reflected to the reflective trough 30 through the phosphor film 80, and the part of the light is reflected in the reflective trough 30 and then emitted to the light emitting surface corresponding to the region between the adjacent LEDs 20 after passing through the phosphor film 80, compared with the structure in the prior art in which the reflective trough 30 is not disposed between the adjacent LEDs 20, the amount of the light emitted from the light emitting surface corresponding to the region between the adjacent LEDs 20 is increased, so that the brightness difference between the region between the adjacent LEDs 20 and the region corresponding to the LED20 is favorably reduced, and the brightness uniformity of the backlight module 100 is favorably improved, and therefore when the backlight module 100 in this embodiment is applied to a display device, the display effect of the display device is favorably improved. Of course, in the backlight module 100 provided in the embodiment of the present application, some other film layers, such as a light guide plate, a diffusion sheet, a brightness enhancement film, and the like, are further disposed on the side of the fluorescent film 80 away from the substrate 10, and besides part of the light received by the reflective groove 30 is the light reflected by the fluorescent film 80, there is also a possibility that the light is the light emitted from the LED and reflected by the film layers, such as the light guide plate, the diffusion sheet, the brightness enhancement film, and the like, which is not particularly limited in this application.
Optionally, in the reflection groove 30 of the backlight module 100 provided in the embodiment of the present application, an included angle between the extension portion 32 and the substrate 31 is θ, and θ is greater than or equal to 90 °.
Specifically, in the embodiment shown in fig. 2, the extending portion 32 of the reflective groove 30 and the substrate 31 are perpendicular to each other, that is, the included angle θ between the extending portion 32 and the substrate 31 is 90 °, and when the extending portion 32 and the substrate 31 adopt such a positional relationship, among the light rays emitted from the LED20, the light rays reflected by the fluorescent film 80 will enter the reflective groove 30 with such a structure more easily, so as to increase the possibility that the light rays entering the reflective groove 30 are reflected to the region between the adjacent LEDs 20, thereby facilitating to increase the brightness of the region between the adjacent LEDs 20. Fig. 6 shows another AA' cross-sectional view of the backlight module 100 in fig. 1, in the reflective groove 30 in this embodiment, an included angle between the extension portion 32 and the base 31 is an obtuse angle, so that an opening of the reflective groove 30 is enlarged, the reflective groove 30 with such a structure can receive more light reflected by the fluorescent film 80 or other film layers on the side of the LED20 away from the substrate, which is more beneficial to increasing the possibility that the light entering the reflective groove 30 is reflected to the region between the adjacent LEDs 20, thereby being more beneficial to improving the brightness of the region between the adjacent LEDs 20, reducing the brightness difference between the region between the adjacent LEDs 20 and the corresponding region of the LED20, and improving the brightness uniformity of the backlight module 100.
Optionally, with continued reference to fig. 2 and fig. 6, in the backlight module 100 provided in the embodiment of the present application, a maximum vertical distance between one end of the LED20 away from the substrate 10 and the substrate 10 is H1, and a maximum vertical distance between one end of the extending portion 32 away from the base 31 and the substrate 10 is H2, wherein H2 is ≦ H1.
Specifically, with reference to fig. 2 and fig. 6, after the reflective groove 30 is introduced into the backlight module 100, when the height H2 of the end of the reflective groove 30 away from the substrate 10 is designed to be less than or equal to the height H1 of the end of the LED20 away from the substrate 10, the thickness of the backlight module 100 itself will not be increased, and the structure of the LED20 in the backlight module 100 away from the substrate 10 will not be affected by the introduction of the reflective groove 30, which is beneficial to simplifying the production process of the backlight module 100 after the reflective groove 30 is introduced into the backlight module 100.
Optionally, referring to fig. 6, in the backlight module 100 provided in the embodiment of the present application, in the same reflective groove 30, a horizontal distance between orthogonal projections of end portions of the two extending portions 32 far away from the base 31 on the plane of the substrate 10 is D1, and a width of a space between two adjacent LEDs 20 is D2, where D1 is not less than D2.
It should be noted that, assuming that the two adjacent LEDs 20 are the first LED21 and the second LED22, respectively, the width D2 of the space between the two adjacent LEDs 20 refers to the distance between the side of the first LED21 close to the second LED22 and the side of the second LED22 close to the first LED 21. When the width D1 of the reflecting groove 30 is designed to be less than or equal to the width of the space between two adjacent LEDs 20, the reflecting groove 30 can be smoothly placed into the area between two adjacent LEDs 20, so that the production process of the backlight module 100 is simplified, and the production efficiency of the backlight module 100 is improved.
Optionally, fig. 7 is a cross-sectional view of the reflective groove 30 in the backlight module 100 according to the embodiment of the present disclosure, please refer to fig. 7, in the backlight module 100 according to the embodiment of the present disclosure, the reflective groove 30 further includes a substrate 33 and a reflective material 34 disposed on the substrate 33, and the reflective material 34 is at least located on a side of the substrate 33 facing the light emitting surface of the backlight module 100. Optionally, the light reflecting material 34 includes silver or aluminum.
In particular, fig. 7 shows a schematic structural diagram of the reflective cavity 30 in the backlight module 100 according to the embodiment of the present application, the reflective trough 30 is formed by evaporating or coating a reflective material 34 on the side of the substrate 33 facing the light exit surface of the backlight module 100, wherein the reflective material 34 can be Ag or Al with high reflectivity, and an Ag film or an Al film is formed on the surface of the substrate 33, the greater the thickness of the Ag film or the Al film is, the more obvious the reflective effect is, when the thickness of the Ag film or the Al film reaches 100nm, the reflectivity can reach more than 90 percent, therefore, by forming the reflective groove 30 by forming an Ag film or an Al film on the substrate 33, the amount of light reflected by the reflective groove 30 to the light emitting surface corresponding to the region between the adjacent LEDs 20 can be effectively increased, and the brightness difference between the region between the adjacent LEDs 20 and the region corresponding to the LED20 can be further reduced, thereby being more beneficial to improving the brightness uniformity of the backlight module 100 and the display effect of the display device. Of course, when the reflective cavities 30 are formed by combining the base material 33 and the luminescent material 34, the luminescent material 34 may be formed by other materials having high reflective efficiency, besides Ag or Al, and this is not particularly limited in the present application.
Optionally, fig. 8 is another cross-sectional view of the reflection groove 30 in the backlight module 100 provided in this embodiment of the present disclosure, in which the reflection groove 30 is a multilayer polyester film composite structure, for example, a multilayer film structure made of pet (polyethylene terephthalate) resin, such as an esr (enhanced Specular reflector) structure. The reflection groove 30 formed by adopting the multilayer polyester film composite structure has very high reflectivity in a visible light wavelength range, can effectively reflect light rays entering the reflection groove 30, is also favorable for increasing the quantity of the light rays reflected to the light-emitting surface corresponding to the area between the adjacent LEDs 20 through the reflection groove 30, and is further favorable for reducing the brightness difference between the area between the adjacent LEDs 20 and the area corresponding to the LED20, so that the brightness uniformity of the backlight module 100 and the display effect of the display device are further favorably improved.
Alternatively, fig. 9 is a top view of the backlight module 100 provided in the embodiment of the present application, fig. 10 is another top view of the backlight module 100 provided in the embodiment of the present application, the LEDs 20 are arranged in an array on the substrate 10, please refer to fig. 9, an elongated reflective slot 36 is included between any two adjacent rows of LEDs 20, or, referring to fig. 10, an elongated reflective slot 38 is included between any two adjacent rows of LEDs 20.
Specifically, when the LEDs 20 are arranged in an array on the substrate 10, the distance between any two adjacent rows of LEDs 20 is through, and the distance between any two adjacent columns of LEDs 20 is also through, at this time, the same strip-shaped reflective groove 36 may be disposed between any two adjacent columns of LEDs 20, for example, please refer to fig. 9, and the small-sized reflective grooves 37 are disposed between two adjacent rows of LEDs 20, so that the number of reflective grooves in the backlight module 100 is reduced, thereby facilitating the simplification of the production process of the backlight module 100. Of course, the manner shown in fig. 10 can also be adopted, in which an elongated reflective groove 38 is disposed between any two adjacent rows of LEDs 20, and small-sized reflective grooves 39 are disposed between any two adjacent rows of LEDs 20, so that the number of reflective grooves 30 in the backlight module 100 can be reduced, and the production efficiency of the backlight module 100 can be improved.
Optionally, in the backlight module 100 provided in the embodiment of the present application, the same reflective groove 30 is integrally formed; alternatively, at least a part of the reflective cavities 30 among all the reflective cavities 30 is integrally formed.
Specifically, referring to fig. 7-10, in view of the structure of the reflective cavities 30 in the backlight module 100 provided in the embodiment of the present application, each reflective cavity 30 includes a base 31 and at least two extending portions 32, and when the same reflective cavity 30 is integrally formed, that is, the base 31 and the extending portions 32 are integrally formed, it is not necessary to separately manufacture the base 31 and the extending portions 32 and then connect the base 31 and the extending portions 32, so that the integrally forming manner is favorable for simplifying the production process of the backlight module 100 and improving the production efficiency of the backlight module 100. In addition, at least part of the reflection grooves 30 in all the reflection grooves 30 are integrally formed, and the integrally formed reflection grooves 30 are prepared and formed in the same process, so that the process of independently manufacturing a single reflection groove 30 is avoided, the production process of the backlight module 100 is more favorably saved, and the production efficiency of the backlight module 100 is improved.
Optionally, in the backlight module 100 provided in the embodiment of the present application, the LED20 is a Mini LED or a Micro LED. When Mini LEDs are selected as the light source of the backlight module 100 in the embodiment of the present application, the Mini LEDs may be arranged in an array on the substrate 10, so that the backlight module 100 becomes a direct-type backlight source. Mini LED, also known as sub-millimeter light emitting diode, refers to an LED having a die size of between about 100 microns and about 1000 microns. When the Mini LED is used for forming the LED provided by the embodiment of the present application, the yield is High, the LED has a special-shaped cutting characteristic, and a backlight form with a High curved surface can be formed by matching the Mini LED with a flexible substrate, so that the LED has better color rendering, and when the Mini LED is applied to a display panel, a more precise HDR (High Dynamic Range, High Dynamic Range image) partition can be provided for the display panel. The application can also select a Mini LED as the light source of the backlight module 100 in the embodiment of the application, and the Micro LED is an LED with a grain size of about 1-10 microns, so that a display screen with pixel particles of 0.05 mm or less can be realized, and the Micro LED has very low power consumption, better material stability and no image residue.
Based on the same inventive concept, the present application further provides a display device 300, fig. 11 is a schematic structural diagram of the display device 300 provided in the embodiment of the present application, fig. 12 is a CC' cross-sectional view of the display device 300 provided in fig. 11, referring to fig. 11 and 12, the display device 300 includes a display panel 500 and a backlight module 100, the backlight module is the backlight module 100 provided in any of the embodiments of the present application, and the display panel 500 may be a liquid crystal display panel. It should be noted that, the display device 300 provided in the embodiment of the present application may be: any product or component with practical functions such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
As can be seen from the above embodiments, the display panel and the display device provided by the present invention at least achieve the following advantages:
the backlight module and the display device provided by the application comprise a substrate and a plurality of LEDs arranged on the substrate and facing the light-emitting surface of the backlight module, and particularly, at least one reflecting groove is introduced into the backlight module and is arranged between two adjacent LEDs. Because part of light emitted from the LEDs in the prior art cannot reach the light-emitting surface of the backlight module, the part of light is usually wasted, and the brightness of the area between the adjacent LEDs may be dark; and this application is after introducing the reflecting groove, in the light of following LED's the ejaculate, can follow the regional play plain noodles that corresponds between the adjacent LED after the reflex action via the reflecting groove from the direct play plain noodles that jets out from backlight unit's play plain noodles, thereby make the light that LED jetted out effectively utilize, the effective utilization ratio of the light source that LED sent has been promoted, the darker problem of luminance between the adjacent LED has also effectively been improved simultaneously, be favorable to the homogeneity of the light that backlight unit sent, thereby be favorable to improving display device's display effect.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (12)
1. A backlight module, comprising:
a substrate;
the LEDs are arranged on one side, facing the light emitting surface of the backlight module, of the substrate;
at least one reflecting groove is arranged between two adjacent LEDs, and the orthographic projection of the reflecting groove on the plane of the substrate is not overlapped with the orthographic projection of the LED on the plane of the substrate; the reflecting groove comprises a base and at least two extending parts connected with the end parts of the base, the extending parts are respectively adjacent to the LEDs, the orthographic projection of the extending parts on the plane of the substrate is positioned between the base and the LEDs adjacent to the extending parts, and the extending parts extend towards one side of the base away from the substrate;
part of light emitted by the LED is emitted from the light emitting surface of the backlight module after being reflected by the reflecting groove; the LEDs are arranged on the substrate in an array mode, and any two adjacent rows of the LEDs comprise a long-strip-shaped reflecting groove, or any two adjacent rows of the LEDs comprise a long-strip-shaped reflecting groove.
2. The backlight module according to claim 1, wherein the reflective groove is disposed between any two adjacent LEDs.
3. The backlight module according to claim 1, further comprising a phosphor film on a side of the LED away from the substrate.
4. The backlight module as claimed in claim 1, wherein the angle between the extension and the substrate is θ, θ is greater than or equal to 90 °.
5. The backlight module as claimed in claim 1, wherein the maximum vertical distance between the substrate and the end of the LED away from the substrate is H1, and the maximum vertical distance between the substrate and the end of the extension away from the base is H2, wherein H2 ≦ H1.
6. The backlight module according to claim 1, wherein in the same reflective groove, the horizontal distance between the orthographic projections of the two ends of the extending portions away from the base on the plane of the substrate is D1, and the width of the space between two adjacent LEDs is D2, wherein D1 ≦ D2.
7. The backlight module as claimed in claim 1, wherein the reflective groove further comprises a substrate and a reflective material disposed on the substrate, the reflective material being at least located on a side of the substrate facing the light-emitting surface of the backlight module.
8. A backlight module according to claim 7, wherein the light reflecting material comprises silver or aluminum.
9. The backlight module of claim 1, wherein the reflective cavities are formed by a multi-layer polyester film composite.
10. The backlight module as claimed in claim 1, wherein the same reflective groove is integrally formed; or, at least part of all the reflecting grooves are integrally formed.
11. The backlight module as claimed in claim 1, wherein the LEDs are Mini LEDs or Micro LEDs.
12. A display device comprising the backlight module of any one of claims 1 to 11.
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| CN111028714A (en) * | 2019-12-26 | 2020-04-17 | 惠州市华星光电技术有限公司 | A backplane structure and display device |
| CN111240094B (en) * | 2020-03-12 | 2022-12-09 | 京东方科技集团股份有限公司 | Area light source |
| CN112782889B (en) | 2021-02-10 | 2022-03-08 | Tcl华星光电技术有限公司 | Backlight module, manufacturing method thereof and liquid crystal display device |
| CN114038985B (en) * | 2021-11-01 | 2025-02-07 | 上海天马微电子有限公司 | A display panel, a manufacturing method thereof and a display device |
| CN115685625B (en) * | 2022-11-30 | 2024-05-07 | 武汉天马微电子有限公司 | Backlight module and display device |
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