CN108572481B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN108572481B CN108572481B CN201810189973.2A CN201810189973A CN108572481B CN 108572481 B CN108572481 B CN 108572481B CN 201810189973 A CN201810189973 A CN 201810189973A CN 108572481 B CN108572481 B CN 108572481B
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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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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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
-
- 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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The application discloses backlight unit and display device relates to and shows technical field, and backlight unit includes: the LED display device comprises a substrate and a plurality of LED elements arranged in a first direction and a second direction on the substrate, wherein the first direction and the second direction are crossed; the substrate is also provided with a retaining wall structure, the retaining wall structure comprises a plurality of first retaining walls which extend along the first direction and are arranged along the second direction and second retaining walls which are arranged along the first direction and extend along the second direction, and the orthographic projections of the first retaining walls and the second retaining walls on the plane of the substrate are positioned between the adjacent light-emitting diode elements; the lateral walls of the first retaining wall and the second retaining wall are provided with light reflecting layers, and the surface of one side of the first retaining wall and the second retaining wall, which is far away from the substrate, and at least part of the lateral walls are provided with light guide layers. Therefore, the LED elements in the backlight module can be partitioned, the light converging effect is realized, the possibility that light in an effective information display area diffuses to the periphery is reduced, and the display effect of the display device is favorably improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a backlight module and a display device.
Background
With the development of liquid crystal display technology, liquid crystal display modules have been widely used in liquid crystal display devices such as mobile phones and tablet computers. However, since the lcd panel of the lcd device does not have the function of emitting light, a backlight module is required to be disposed below the lcd panel to provide the required light source, so as to achieve the display effect.
The backlight module is positioned behind the liquid crystal display module and provides a light source for normal display of the liquid crystal display module, the luminous effect of the backlight module directly influences the visual effect of the liquid crystal display module, and the backlight module mainly comprises a light source, a light guide plate, an optical film and the like and is divided into a side-in type and a direct type according to different light source distribution positions. The liquid crystal display device is a light-transmitting display device, the backlight is required to provide the brightness required by the display during the display, for most liquid crystal display modules, the backlight is usually in a normal-brightness mode and is uniformly controlled, and in the information display process of the display device, the shadow phenomenon exists around an effective information display area, so that the contrast of the display device is reduced, and the display effect is poor.
Disclosure of Invention
In view of this, the technical problem to be solved by the present application is to provide a backlight module and a display device, where a first retaining wall or a second retaining wall is disposed between at least some adjacent light emitting diode elements, and the light emitting diodes are partitioned by the first retaining wall and the second retaining wall, so as to realize area control of the backlight module, and enable light rays in each area to respectively realize an aggregation effect, thereby reducing the possibility of light rays in an effective information display area diffusing to the periphery, thereby reducing the possibility of occurrence of a shadow phenomenon around the effective information display area, and being beneficial to improving the contrast of the display device, thereby being beneficial to improving the display effect of the display device. Moreover, this application sets up reflector layer and leaded light layer at the lateral wall of first barricade and second barricade, can strengthen reflection efficiency, can reduce the possibility that first barricade and second barricade correspond the position and form the shadow at luminous in-process again to be favorable to further promoting display device's display effect.
In order to solve the technical problem, the following technical scheme is adopted:
in a first aspect, the present application provides a backlight module, comprising: the LED display device comprises a substrate and a plurality of LED elements arranged along a first direction and a second direction, wherein the first direction and the second direction are crossed;
the substrate is also provided with a retaining wall structure, the retaining wall structure comprises a plurality of first retaining walls extending along the first direction and arranged along the second direction and a plurality of second retaining walls arranged along the first direction and extending along the second direction, and the orthographic projections of the first retaining walls and the second retaining walls on the plane of the substrate are positioned between the adjacent light-emitting diode elements;
the side wall of the first retaining wall and the side wall of the second retaining wall are provided with light reflecting layers, and the surface of one side of the substrate and at least part of the side wall of the first retaining wall and the second retaining wall are provided with light guide layers.
Optionally, wherein:
the light emitting angle of the light emitting diode element is
The first retaining wall comprises a first section which is vertical to the plane of the substrate and is perpendicular to the first direction, the first retaining wall is of a first trapezoidal structure in the first section, the base angle of one side, close to the substrate, of the first trapezoidal structure is theta 1,
the second retaining wall comprises a second section which is vertical to the plane of the substrate and vertical to the second direction, the second retaining wall is of a second trapezoidal structure at the second section, the base angle of one side, close to the substrate, of the second trapezoidal structure is theta 2,
optionally, wherein:
optionally, wherein:
optionally, wherein:
optionally, wherein:
the first retaining walls and the second retaining walls define a plurality of light emitting units in a staggered mode, and at least one light emitting diode element is arranged in each light emitting unit.
Optionally, wherein:
the light guide layer is adhered to the surfaces of the first retaining wall and the second retaining wall on the side far away from the substrate and at least part of the side wall through an adhesive layer.
Optionally, wherein:
the thickness of the light guide layer is D1, and D1 is not more than 0.1 mm.
Optionally, wherein:
the light guide layer and the first retaining wall or the second retaining wall are integrally formed in a mold injection molding mode.
Optionally, wherein:
the perpendicular distance between the surface of base plate and the bottom surface of first barricade or second barricade is D2, wherein, 5mm is less than or equal to D2 and is less than or equal to 10mm is kept away from to the leaded light layer.
Optionally, wherein:
the emissivity of the reflecting layer is R which is more than or equal to 90%.
Optionally, wherein:
the light reflecting layer includes at least one of chromium and nickel.
Optionally, wherein:
the backlight module also comprises a diffusion sheet, a lower light increasing sheet and an upper light increasing sheet which are sequentially arranged along the direction vertical to the substrate, and the diffusion sheet is arranged close to the light emitting diode element.
In a second aspect, the present application further provides a display device, which includes the backlight module provided in the present application.
Compared with the prior art, this application backlight unit and display device, reached following effect:
in the backlight module and the display device provided by the application, set up first barricade or second barricade between at least part adjacent emitting diode component, utilize first barricade and second barricade to become a plurality of blocks with a plurality of emitting diode components in backlight module, so can carry out the independent control to the emitting diode component of each block, thereby backlight module's regional control has been realized, the effect of assembling has been realized respectively to the reflection to light of first barricade and second barricade makes the light in each region, reduce the possibility that light between the adjacent block produced the interact, thereby reduce the regional light of effective information display and spread to the periphery, reduce the shadow phenomenon that appears around effective information display region, be favorable to promoting display device's contrast, thereby be favorable to promoting display device's display effect. In addition, the side walls of the first retaining wall and the second retaining wall are provided with the reflecting layers, so that the light reflection efficiency is enhanced, and the light utilization efficiency is improved; and the surface of one side of the first retaining wall and the second retaining wall, which is far away from the substrate, and at least part of the side wall are provided with the light guide layers, and the light emitted by the light emitting diode element can be conducted out from the top ends and part of the side wall of the first retaining wall and the second retaining wall by utilizing the light guide layers, so that the possibility of the shadow phenomenon of the backlight module in the corresponding area of the first retaining wall and the second retaining wall in the light emitting process is reduced, and the display effect of the display device is further improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a cross-sectional view of a backlight module in the prior art;
FIG. 2 is a top view of a backlight module in the prior art;
fig. 3 is a cross-sectional view of a backlight module according to an embodiment of the present disclosure;
fig. 4 is a top view of a backlight module according to an embodiment of the disclosure;
fig. 5 is a cross-sectional view of a first retaining wall and a second retaining wall according to an embodiment of the present application;
FIG. 6 is a diagram showing an effect of the display device when the first dam and the second dam are not introduced into the backlight module;
FIG. 7 is a diagram illustrating an exemplary display effect of the display device after the first dam and the second dam are introduced into the backlight module according to the embodiment of the disclosure;
fig. 8 is an enlarged partial cross-sectional view of a backlight module according to an embodiment of the disclosure;
fig. 9 is an enlarged partial cross-sectional view of a backlight module according to an embodiment of the disclosure;
fig. 10 is a partial cross-sectional view of a backlight module according to an embodiment of the disclosure;
fig. 11 is a top view of a backlight module according to an embodiment of the disclosure;
fig. 12 is another cross-sectional view of a backlight module according to an embodiment of the disclosure;
FIG. 13 is a schematic view of a light path of a backlight module without a first dam and a second dam;
fig. 14 is a schematic structural diagram of a display device provided in the present application.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, different manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result. Furthermore, the term "coupled" is intended to encompass any direct or indirect electrical coupling. Thus, if a first device couples to a second device, that connection may be through a direct electrical coupling or through an indirect electrical coupling via other devices and couplings. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
As for most of liquid crystal display modules, the backlight usually includes a plurality of light emitting diode elements, see fig. 1 and 2, fig. 1 is a cross-sectional view of a backlight module in the prior art, fig. 2 is a top view of a backlight module in the prior art, since the light of the light emitting diode elements 301 is divergent, the brightness in the central area of each light emitting diode element 301 is higher, and the brightness in the peripheral area is darker, when two adjacent light emitting diode elements 301 need to be simultaneously lit, a dark shadow phenomenon may occur between the adjacent light emitting diode elements 301; although the above problem can be solved by reducing the distance between the adjacent light emitting diode elements 301, when only one of the adjacent light emitting diode elements 301 needs to be lit, the light of the lit light emitting diode element 301 is emitted to the area corresponding to the adjacent light emitting diode element 301, so that the area corresponding to the light emitting diode which does not need to be lit cannot be in the black state, and therefore, in the process of displaying information by the display device, a shadow phenomenon may occur around the effective information display area (a part of the light is emitted to the area which needs to be in the black state), which results in the contrast of the display device being reduced and the display effect being poor.
In view of this, the present application provides a backlight module and a display device, where a first retaining wall or a second retaining wall is disposed between at least some adjacent light emitting diode elements, and the light emitting diodes are partitioned by the first retaining wall and the second retaining wall, so as to realize area control of the backlight module, and enable light rays in each area to respectively realize an aggregation effect, thereby reducing the possibility of light rays in an effective information display area diffusing to the periphery, thereby reducing the possibility of occurrence of a shadow phenomenon around the effective information display area, and facilitating improvement of contrast of the display device, thereby facilitating improvement of display effect of the display device. Moreover, this application sets up reflector layer and leaded light layer at the lateral wall of first barricade and second barricade, can strengthen reflection efficiency, can reduce the possibility that first barricade and second barricade correspond the position and form the shadow at luminous in-process again to be favorable to further promoting display device's display effect.
Referring to fig. 3, which is a cross-sectional view of a backlight module provided in an embodiment of the present application, fig. 4 is a top view of the backlight module provided in the embodiment of the present application, fig. 5 is a cross-sectional view of a first retaining wall and a second retaining wall provided in the embodiment of the present application, referring to fig. 3 and 4, a backlight module 100 provided in the embodiment of the present application includes: a substrate 10 and a plurality of light emitting diode elements 20 arranged in a first direction and a second direction on the substrate 10, the first direction and the second direction crossing;
referring to fig. 4, the substrate 10 is further provided with a retaining wall structure, the retaining wall structure includes a plurality of first retaining walls 31 extending along the first direction and arranged along the second direction and second retaining walls 32 arranged along the first direction and extending along the second direction, and the orthographic projections of the first retaining walls 31 and the second retaining walls 32 on the plane of the substrate 10 are located between the adjacent light emitting diode elements 20;
referring to fig. 5, the side walls of the first retaining wall 31 and the second retaining wall 32 are provided with a light reflecting layer 33, and the surfaces and at least part of the side walls of the first retaining wall 31 and the second retaining wall 32 on the sides far away from the substrate 10 are provided with a light guiding layer 34.
Specifically, referring to fig. 3, a plurality of led devices 20 are disposed on a substrate 10 of a backlight module 100, a plurality of first retaining walls 31 and second retaining walls 32 are further disposed on the substrate 10, the first retaining walls 31 and the second retaining walls 32 form a grid structure, the first retaining walls 31 and the second retaining walls 32 are located between at least some adjacent led devices 20, that is, one or more led devices 20 are disposed in hollow areas where the first retaining walls 31 and the second retaining walls 32 form the grid structure, so that the first retaining walls 31 and the second retaining walls 32 partition the led devices 20, referring to fig. 4, thereby realizing area control of the backlight module, enabling light rays of each area to respectively realize a convergence effect, reducing a possibility of light rays of an effective information display area diffusing to the periphery, and reducing a possibility of a shadow phenomenon occurring around the effective information display area, for example, when the light of the led device 20 in one area is required to be strong and the light of the other area adjacent to the one area is required to be black, due to the effect of the first retaining wall 31 and the second retaining wall 32, the strong light in the one area will not enter the peripheral area, and the peripheral area can still maintain the black state, thereby greatly improving the display effect of the display device.
In addition, referring to fig. 5, in the present application, the reflective layer 33 is disposed on the sidewalls of the first retaining wall 31 and the second retaining wall 32, light emitted by the led element 20 can be reliably reflected under the action of the reflective layer 33, and the introduction of the reflective layer 33 is beneficial to improving the effective utilization rate of the light; in particular, in the embodiment of the present application, the light guide layer 34 is further disposed on the surface (i.e., the top) of the first retaining wall 31 and the second retaining wall 32 away from the substrate 10 and at least a portion of the side wall connected to the top, and after the light emitted by the light emitting diode element 20 reaches the light guide layer 34, the light can be emitted from the position where the light guide layer 34 is located through the conduction function of the light guide layer 34, and the introduction of the light guide layer 34 effectively reduces the possibility of the occurrence of a shadow phenomenon at the positions where the first retaining wall 31 and the second retaining wall 32 are located in the light emitting process of the backlight module 100, thereby facilitating the improvement of the display effect of the display device. Fig. 6 is a diagram showing a display effect of the display device without the first retaining wall and the second retaining wall being introduced into the backlight module, fig. 7 is a diagram showing a display effect of the display device after the first retaining wall and the second retaining wall are introduced into the backlight module according to the embodiment of the present application, comparing fig. 6 with fig. 7, when the first retaining wall and the second retaining wall are not introduced into the backlight module, there are light rays in the area around the effective information area, a shadow phenomenon occurs, the picture display is blurred, and the contrast is low; when the first retaining wall 31 and the second retaining wall 32 are introduced into the backlight module 100 and the reflective layer 33 and the light guide layer 34 are disposed on the first retaining wall 31 and the second retaining wall 32, no bright area is formed around the effective information area of the display content of the display device, a black state is formed, no shadow is generated, the image display is clear, and the contrast ratio is high. Therefore, the scheme of the backlight module 100 provided in the embodiment of the present application can effectively improve the display effect of the display device.
Alternatively, fig. 8 is a partial enlarged cross-sectional view of the backlight module provided in the embodiment of the present application, fig. 9 is another partial enlarged cross-sectional view of the backlight module provided in the embodiment of the present application, and the light-emitting angle of the light-emitting diode element 20 provided in the embodiment of the present application is
With reference to figure 8 of the drawings,the first retaining wall 31 includes a first cross section perpendicular to the plane of the substrate 10 and perpendicular to the first direction, and in the first cross section, the first retaining wall 31 has a first trapezoid structure, a base angle of the first trapezoid structure near the substrate 10 is θ 1,
referring to fig. 9, the second blocking wall 32 includes a second cross section perpendicular to the plane of the substrate 10 and perpendicular to the second direction, and in the second cross section, the second blocking wall 32 has a second trapezoid structure, a base angle of the second trapezoid structure near the substrate 10 is θ 2,
in general, the light-emitting angle of the light-emitting diode element 20
That is, the scattering angle of the light of the led element 20, please refer to fig. 10, fig. 10 is a partial cross-sectional view of the backlight module according to the embodiment of the present application, and the light emitting angle of the led in fig. 10 is
After the light emitted from the led element 20 reaches the sidewalls of the first retaining wall 31 or the second retaining wall 32, a part of the light is reflected by the reflective layer of the sidewalls of the first retaining wall 31 or the second retaining wall 32 and then emitted to the light-emitting surface of the backlight module 100
And
the design of the light guide plate can ensure that the light reflected by the reflective layer 33 is emitted from the light-emitting surface of the backlight module 100, thereby facilitating the improvement of the light utilization rate of the led element 20.
Alternatively, in the embodiment shown in fig. 8,
that is, the angle of the base angle θ 1 of the first trapezoid structure of the first retaining wall 31 on the side close to the substrate 10 is half of the light emitting angle of the led. Referring to fig. 8, in the first cross section, when the base angle θ 1 of the side of the first retaining wall 31 close to the substrate 10 is set to be half of the light emitting angle of the led element 20 in the embodiment of the present application, when the light emitted from the led element 20 reaches the sidewall of the first retaining wall 31, after the light is reflected by the reflective layer, the reflected light will be emitted perpendicularly along the direction perpendicular to the light emitting surface of the backlight module, so that the light emitted from the light emitting surface of the backlight module is more uniform, which is beneficial to improving the display effect of the display device.
Alternatively, in the embodiment shown in fig. 9,
that is, the angle of the bottom angle θ 2 of the second trapezoid structure of the second barrier wall 32 close to the substrate 10 is half of the light emitting angle of the led. Referring to fig. 9, in the second cross section, when the base angle θ 2 of the side of the second retaining wall 32 close to the substrate 10 is set to be half of the light emitting angle of the led element 20, when the light emitted from the led element 20 reaches the side wall of the second retaining wall 32, after the light is reflected by the reflective layer 33, the reflected light is emitted perpendicularly along the direction perpendicular to the light emitting surface of the backlight module 100, so that the light emitted from the light emitting surface of the backlight module is more uniform, which is also beneficial to improving the display effect of the display device.
Alternatively, referring to fig. 10, the light emitting angle of the light emitting diode element 20 satisfies
The light emitting angles corresponding to the different types of led elements 20 are different, and the light emitting angles range from 110 ° to 120 °, although the embodiment of the present invention is not limited theretoThe light emitting angle of the led element 20 is not limited to the above range, and may be designed to be other angles according to actual requirements, which is not specifically limited in this application.
Optionally, referring to fig. 3, the plurality of first retaining walls 31 and the plurality of second retaining walls 32 define a plurality of light emitting units in a staggered manner, and each light emitting unit is provided with at least one led device 20.
Specifically, in the embodiment shown in fig. 4, in the light emitting units 60 defined by the first retaining walls 31 and the second retaining walls 32 alternately, the number of the light emitting diode elements 20 contained in each light emitting unit 60 is 4, and in the light emitting process of the backlight module 100, each light emitting unit 60 is used as a light emitting unit and is controlled uniformly, for example, the light emitting units 60 corresponding to the effective information display area of the display device can be uniformly lighted, while other areas are uniformly black, and since the adjacent light emitting units 60 are separated by the first retaining walls 31 and the second retaining walls 32, the light emitted from the light emitting diode elements 20 is emitted perpendicularly to the light emitting surface of the backlight module 100 after being reflected by the reflective layers on the first retaining walls 31 and the second retaining walls 32 or emitted from the light emitting surface of the backlight module 100 after being converged toward the central axis of each light emitting unit 60, so that the light of one light emitting unit 60 does not emit into the areas corresponding to the other light emitting units 60, the light emitting unit 60 that needs to be in the black state is not affected by the light of other lighted light emitting units 60, and the black state will be present, so that the possibility of the blurring phenomenon occurring in the effective display area in the display process of the display device is effectively reduced, and the display contrast of the display device is favorably improved. In addition, referring to fig. 5, since the light guide layer 34 is disposed at the top of the first retaining wall 31 and the second retaining wall 32 and a portion of the side wall adjacent to the top, after the light reaches the light guide layer 34, the light will be emitted from the top positions of the first retaining wall 31 and the second retaining wall 32 to the light emitting surface of the backlight module 100 due to the conduction function of the light guide layer 34, that is, the top positions of the first retaining wall 31 and the second retaining wall 32 can also conduct the light, and in the display process of the display device, the possibility of occurrence of a dark shadow at the corresponding positions of the first retaining wall 31 and the second retaining wall 32 is effectively reduced, thereby further facilitating the improvement of the display effect of the display device.
Fig. 11 is another top view of the backlight module according to an embodiment of the present disclosure, in the embodiment, in the plurality of light emitting units 60 defined by the first retaining wall 31 and the second retaining wall 32 in an interlaced manner, each light emitting unit 60 includes one led element 20, such a partitioning manner enables each led element 20 to be controlled independently, and light emitted by each led element does not affect the area where other led elements 20 are located, so that the backlight module 100 achieves finer partitioning and control, and is more beneficial to improving the contrast of the display device, and is more beneficial to improving the display effect of the display device.
It should be noted that the number of the light emitting diodes included in the light emitting unit 60 defined by the first retaining wall 31 and the second retaining wall 32 intersecting with each other in the embodiment of the present application can be flexibly set according to the requirement, and the present application does not mention one by one, and the smaller the number of the light emitting diode elements 20 included in each light emitting unit 60, the higher the fineness of the light emitting control.
Optionally, in the backlight module 100 provided in the embodiment of the present application, the light guide layer 34 is adhered to the surfaces of the first retaining wall 31 and the second retaining wall 32 away from the substrate 10 and at least a portion of the sidewalls through an adhesive layer, please refer to fig. 5.
Specifically, referring to fig. 5, the light guiding layer 34 provided in the embodiment of the present application may be adhered to the corresponding positions of the first retaining wall 31 and the second retaining wall 32 by an adhesive layer, and after the first retaining wall 31 and the second retaining wall 32 are manufactured, the light guiding layer 34 is adhered to the corresponding positions, where the adhesive layer may be a double-sided adhesive tape, and the double-sided adhesive tape may be made of a material with high light transmittance, so as to reduce loss of light in the transmission process.
Optionally, please continue to refer to fig. 5, the thickness of the light guide layer 34 is D1, and D1 is less than or equal to 0.1 mm. In the embodiment of the present application, the thickness of the light guide layer 34 is designed to be less than or equal to 0.1mm, and the light guide layer 34 with the thickness is convenient to bend and adhere.
Optionally, the light guide layer 34 provided in the embodiment of the present application and the first retaining wall 31 or the second retaining wall 32 are integrally formed by injection molding.
Specifically, in the embodiment of the present application, the light guide layer 34 and the first retaining wall 31 or the second retaining wall 32 form an integrated body by adopting a pasting method, and the light guide layer 34 can be integrated with the first retaining wall 31 or the second retaining wall 32 by injection molding through a mold, so that the manufacturing of the light guide layer 34 can be completed while the first retaining wall 31 or the second retaining wall 32 is manufactured, which is beneficial to saving the production process and improving the production efficiency of the backlight module 100.
It should be noted that the first retaining wall 31 and the second retaining wall 32 in the embodiment of the present application may be made of PC (polycarbonate), or may be made of metal materials such as steel or aluminum, during the actual production process, the first retaining wall 31 and the second retaining wall 32 may be separately manufactured, and after the first retaining wall 31 and the second retaining wall 32 are manufactured, the first retaining wall 31 and the second retaining wall 32 are placed between at least some adjacent light emitting diode elements 20 in the backlight module 100.
Optionally, referring to fig. 5, a vertical distance between the surface of the light guide layer 34 away from the substrate 10 and the bottom surface of the first retaining wall 31 or the second retaining wall 32 is D2, wherein D2 is greater than or equal to 5mm and less than or equal to 10 mm.
Specifically, the distance between the bottom surface of the first retaining wall 31 or the second retaining wall 32 and the light guide layer 34 located at the top of the first retaining wall 31 or the second retaining wall 32 is designed to be 5mm or more and D2 or more and 10mm or less, such height design enables a large portion of light emitted by the led element 20 to be emitted into the light reflecting layer 33 and the light guide layer 34 on the side walls of the first retaining wall 31 and the second retaining wall 32, and most of the light reflected by the light reflecting layer 33 and the light conducted by the light guide layer 34 can be emitted from the light emitting surface of the backlight module 100, thereby facilitating the improvement of the utilization rate of the light emitted by the led element 20.
Optionally, in the backlight module 100 provided in the embodiment of the present application, the emissivity of the reflective layer 33 located on the sidewalls of the first retaining wall 31 and the second retaining wall 32 is R, and R is greater than or equal to 90%. The higher the reflectivity of the light reflecting layer 33 is, the higher the reflection efficiency of the light emitted from the led element 20 is, which is more beneficial to improving the utilization rate of the light emitted from the led element 20.
Optionally, in the backlight module 100 provided in the embodiment of the present application, the light reflecting layer 33 includes at least one of chromium and nickel. Chromium and nickel belong to the material that the reflectivity is higher, adopt these materials to form the reflector layer, all can effectively promote the light utilization ratio of emitting diode component 20. Of course, besides chromium and nickel, other materials with higher reflectivity may be used in the embodiments of the present application, which is not specifically limited in the present application. It should be noted that, in the embodiment of the present invention, the reflective layer 33 may be formed on the sidewalls of the first retaining wall 31 and the second retaining wall 32 by electroplating.
Optionally, fig. 12 is another cross-sectional view of the backlight module provided in this embodiment of the application, the backlight module 100 further includes a diffusion sheet 41, a lower light-adding sheet 42, and an upper light-adding sheet 43 sequentially disposed along a direction perpendicular to the substrate 10, and the diffusion sheet 41 is disposed near the led element 20.
Specifically, referring to fig. 12, the backlight module 100 of the present application further includes a diffusion sheet 41, a lower light-adding sheet 42 and an upper light-adding sheet 43 sequentially disposed, light emitted from the led element 20 first enters the diffusion sheet 41 after passing through the first retaining wall 31 and the second retaining wall 32, and the diffusion sheet 41 basically includes a diffusion layer + a substrate + a protection layer, wherein the substrate is a material with high transmittance, such as polyethylene terephthalate PET, polycarbonate PC, and the like, and the diffusion layer and the protection layer are usually made of acrylic resin. This application can let light see through diffusion coating and produce diffuse reflection through setting up diffusion 41, makes light evenly distributed, guarantees backlight module face internal brightness homogenization. In addition, the lower brightness enhancement sheet 42 and the upper brightness enhancement sheet 43 are further disposed on one side of the diffusion sheet 41 away from the led element 20, and the brightness of the backlight module 100 can be improved integrally through the combined action of the lower brightness enhancement sheet 42 and the upper brightness enhancement sheet 43, so as to facilitate the improvement of the display brightness and the display effect of the display device.
It should be noted that, after the first retaining wall 31 and the second retaining wall 32 are introduced, the embodiment of the present application is further beneficial to reduce the distance between the led element 20 and the diffusion sheet 41, so as to be beneficial to reducing the thickness of the backlight module 100, for the following reasons.
Referring to the drawings, fig. 13 is a schematic light path diagram of a backlight module without the first retaining wall and the second retaining wall in the prior art. Referring to fig. 13, when the first and second retaining walls are not introduced, the light of the led elements 301 is more diffused and lost, and generally, in order to reduce the possibility of occurrence of dark shadows at the corresponding positions of the led elements during the display process of the display apparatus, the distance between the adjacent led elements is required to satisfy the area of the overlapping region of the light emitted by the two led elements to be at least 50% of the area of the single-lamp light emitting area, so that the distance between the adjacent led elements 301 needs to be increased to increase the area of the light overlapping region. In general, the ratio between the distance OD1 between the led device 301 and the diffusion sheet 302 and the distance P1 between the adjacent led devices 301 in the direct-type backlight module is required to be 1-1.5: 1, and when the distance between the adjacent led devices 301 is increased, the distance between the led device 301 and the diffusion sheet 302 needs to be increased at the same time, which increases the overall thickness of the backlight module 300. In the present application, after the first retaining wall 31 and the second retaining wall 32 are introduced, referring to fig. 12, after the light emitted from the led element 20 is reflected by the reflective layer 33 on the sidewalls of the first retaining wall 31 and the second retaining wall 32, the light path is shortened, and the distance OD2 between the led element 20 and the diffusion sheet 41 can be reduced, so as to reduce the thickness of the backlight module 100. The applicant finds that, through numerous simulation tests, OD1 ≈ 3.5OD2, P1 ≈ 1.5P2, and OD1 is conventionally designed to be more than 15mm, and OD2 can be thinned to 4.3mm by calculation, so that after the first retaining wall 31 and the second retaining wall 32 are introduced, the thickness of the backlight module 100 is greatly reduced, and in addition, because P1 ≈ 1.5P2, after the first retaining wall 31 and the second retaining wall 32 are introduced, the distance P2 between adjacent light emitting diode elements 20 is further reduced, the number of the light emitting diode elements 20 is larger in the same unit area, and the partitions can be further thinned, so that the finer partitions and control of the backlight module 100 can be realized, and the display effect of the display device can be further improved. In the embodiment of the present application, the distance P2 between two adjacent light emitting diode elements 20 refers to the center distance between two adjacent light emitting diode elements 20, and the distance OD2 between the light emitting diode element 20 and the diffusion sheet 41 refers to the distance between the surface of the light emitting diode element 20 on the side away from the substrate 10 and the surface of the diffusion sheet 41 on the side close to the substrate 10.
Based on the same inventive concept, the present application provides a display device, and fig. 14 is a schematic structural diagram of the display device provided in the present application, where the display device 200 includes a backlight module 100, where the backlight module is the backlight module 100 provided in the present application. The embodiment of the display device 200 of the present application can be referred to the embodiment of the backlight module 100, and repeated descriptions thereof are omitted here.
According to the embodiments, the application has the following beneficial effects:
in the backlight module and the display device provided by the application, the first retaining wall or the second retaining wall is arranged between at least part of the adjacent light-emitting diode elements, and the plurality of light-emitting diode elements in the backlight module are divided into a plurality of blocks by the first retaining wall and the second retaining wall, so that the light-emitting diode elements of each block can be independently controlled, thereby realizing the area control of the backlight module, the light rays in each area are respectively converged under the reflection action of the first retaining wall and the second retaining wall to the light rays, reducing the possibility of mutual influence of the light rays between adjacent blocks, further reducing the possibility of the light rays in the effective information display area diffusing to the periphery, and then reduce the possibility that the shadow phenomenon appears around the effective information display area, be favorable to promoting display device's contrast to be favorable to promoting display device's display effect. In addition, the side walls of the first retaining wall and the second retaining wall are provided with the reflecting layers, so that the light reflection efficiency is enhanced, and the light utilization efficiency is improved; and the surface of one side of the first retaining wall and the second retaining wall, which is far away from the substrate, and at least part of the side wall are provided with the light guide layers, and the light emitted by the light emitting diode element can be conducted out from the top ends and part of the side wall of the first retaining wall and the second retaining wall by utilizing the light guide layers, so that the possibility of the shadow phenomenon of the backlight module in the corresponding area of the first retaining wall and the second retaining wall in the light emitting process is reduced, and the display effect of the display device is further improved.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (12)
1. A backlight module, comprising: the LED display device comprises a substrate and a plurality of LED elements arranged along a first direction and a second direction, wherein the first direction and the second direction are crossed;
the substrate is also provided with a retaining wall structure, the retaining wall structure comprises a plurality of first retaining walls extending along the first direction and arranged along the second direction and a plurality of second retaining walls arranged along the first direction and extending along the second direction, and the orthographic projections of the first retaining walls and the second retaining walls on the plane of the substrate are positioned between the adjacent light-emitting diode elements;
the side walls of the first retaining wall and the second retaining wall are provided with light reflecting layers, and the surfaces of one sides of the first retaining wall and the second retaining wall, which are far away from the substrate, and at least part of the side walls are provided with light guide layers; the thickness of the light guide layer is D1, and D1 is less than or equal to 0.1 mm;
wherein the light emitting angle of the light emitting diode element is
The first retaining wall comprises a first section which is vertical to the plane of the substrate and is perpendicular to the first direction, the first retaining wall is of a first trapezoidal structure in the first section, the base angle of one side, close to the substrate, of the first trapezoidal structure is theta 1,
the second retaining wall comprises a second section which is vertical to the plane of the substrate and vertical to the second direction, the second retaining wall is of a second trapezoidal structure at the second section, the base angle of one side, close to the substrate, of the second trapezoidal structure is theta 2,
2. the backlight module according to claim 1,
3. the backlight module according to claim 1,
4. the backlight module according to claim 1,
5. the backlight module as claimed in claim 1, wherein the first and second walls define a plurality of light emitting units, and at least one of the LED elements is disposed in each of the light emitting units.
6. The backlight module as claimed in claim 1, wherein the light guide layer is adhered to the surfaces of the first and second retaining walls on the sides away from the substrate and at least a portion of the sidewalls by an adhesive layer.
7. The backlight module as claimed in claim 1, wherein the light guide layer is integrally formed with the first or second retaining wall by injection molding.
8. The backlight module as claimed in claim 1, wherein a vertical distance between the surface of the light guide layer away from the substrate and the bottom surface of the first or second retaining wall is D2, wherein D2 is 5mm or more and 10mm or less.
9. The backlight module as claimed in claim 1, wherein the reflective layer has an emissivity R ≧ 90%.
10. A backlight module according to claim 1, wherein the light reflecting layer comprises at least one of chromium and nickel.
11. The backlight module as claimed in claim 1, further comprising a diffusion sheet, a lower brightness enhancement sheet and an upper brightness enhancement sheet sequentially arranged along a direction perpendicular to the substrate, wherein the diffusion sheet is disposed adjacent to the light emitting diode elements.
12. A display device comprising the backlight module of any one of claims 1 to 11.
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| CN201810189973.2A CN108572481B (en) | 2018-03-08 | 2018-03-08 | Backlight module and display device |
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| CN201810189973.2A CN108572481B (en) | 2018-03-08 | 2018-03-08 | Backlight module and display device |
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| CN108572481B true CN108572481B (en) | 2021-10-26 |
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