CN109283745B - Direct type backlight module and display device - Google Patents
Direct type backlight module and display device Download PDFInfo
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- CN109283745B CN109283745B CN201811442026.6A CN201811442026A CN109283745B CN 109283745 B CN109283745 B CN 109283745B CN 201811442026 A CN201811442026 A CN 201811442026A CN 109283745 B CN109283745 B CN 109283745B
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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
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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
-
- 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
-
- 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
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
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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
- 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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Abstract
The invention discloses a direct type backlight module and a display device, wherein the direct type backlight module comprises: a substrate; the lamp beads are arranged on one surface of the substrate, and a gap area is formed between any two adjacent lamp beads; and the optical structures are positioned in the light-emitting direction of the lamp beads, each optical structure corresponds to at least one lamp bead, and the optical structures are used for guiding and irradiating part of the light-emitting of the lamp beads corresponding to the optical structures to the gap area on at least one side of the lamp beads corresponding to the optical structures. The light-emitting device has the advantages that the light-emitting device guides and irradiates the gap region of at least one side of the lamp bead corresponding to the optical structure through the partial light-emitting of the lamp bead corresponding to the optical structure, and further compensates the brightness of the gap between two adjacent main lamp beads, improves the problem that the light mixing of the two adjacent main lamp beads is insufficient in the gap region, can improve the problem of poor uniformity of an emergent surface light source of a direct type backlight module, can also improve the brightness of the surface light source, and ensures high display effect of the display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to a direct type backlight module and a display device.
Background
Liquid Crystal Display (LCD) devices have many advantages such as thin body, power saving, and no radiation, and are widely used, for example: a mobile phone, a Personal Digital Assistant (PDA), a digital camera, a computer screen or a laptop screen, etc.
Most of the existing liquid crystal display devices in the market are Backlight liquid crystal display devices, which include a housing, a liquid crystal panel disposed in the housing, and a Backlight Module (Backlight Module) disposed in the housing. The conventional liquid crystal panel is composed of a Color Filter Substrate (Color Filter), a Thin Film transistor Array Substrate (TFT Array Substrate) and a liquid crystal Layer (liquid crystal Layer) disposed between the two substrates, and its operation principle is to apply driving voltage to the two glass substrates to control the rotation of liquid crystal molecules of the liquid crystal Layer, so as to refract the light of the backlight module to generate a picture. Since the lcd panel does not emit light, the backlight module is one of the key components of the lcd device because the backlight module needs to provide a light source to normally display images.
The backlight module is divided into a side-in type backlight module and a direct type backlight module according to the different incident positions of the light sources. The side-in backlight module is characterized in that a light-emitting device is arranged at the edge of a light guide plate arranged on the back of a liquid crystal panel, light emitted by the light-emitting device enters the light guide plate from the side face of the light guide plate, is emitted from a light-emitting surface of the light guide plate after being reflected and diffused, and then passes through an optical film group to form a surface light source to be provided for the liquid crystal panel. The direct type backlight module directly arranges a plurality of light-emitting devices on the back of the liquid crystal panel to directly form a surface light source for the liquid crystal panel, and the uniformity of the emergent surface light source formed by the existing direct type backlight module is poor.
Disclosure of Invention
In view of this, the present invention provides a direct type backlight module and a display device, which improve the problem of poor uniformity of an exit surface light source of the direct type backlight module and ensure a high display effect of the display device.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a direct type backlight module includes:
a substrate;
the lamp beads are arranged on one surface of the substrate, and a gap area is formed between any two adjacent lamp beads;
and at least one optical structure positioned in the light-emitting direction of the lamp beads, wherein each optical structure corresponds to at least one lamp bead, and the optical structure is used for guiding and irradiating part of the light-emitting of the lamp beads corresponding to the optical structure to the gap area at least on one side of the lamp beads corresponding to the optical structure.
Optionally, the optical structure corresponds to the lamp beads one to one, wherein the optical structure includes a first inverse prism to an nth inverse prism, which are located on the same plane parallel to the substrate and are sequentially arranged in the direction away from and corresponding to the lamp beads, and N is an integer not less than 1.
Optionally, the ith inverse prism is annular and arranged around the lamp bead;
the ith inverse prism is of an integral structure, or the ith inverse prism comprises a plurality of ith sub-inverse prisms in the annular direction, and i is a positive integer not greater than N.
Optionally, the first inverse prism to the nth inverse prism are away from the bottom surface of the lamp bead and are located on the same horizontal plane, wherein the heights of the first inverse prism to the nth inverse prism on the horizontal plane are in a decreasing trend.
Optionally, the ith inverse prism has a height of 7-20 microns, inclusive, and i is a positive integer no greater than N.
Optionally, the first inverse prism to the nth inverse prism are away from the bottom surface of the lamp bead and are located on the same horizontal plane, wherein on any cross section perpendicular to the horizontal plane, the distance between the centers of the bottom edges of any two adjacent inverse prisms is 14 micrometers to 40 micrometers, inclusive.
Optionally, the first inverse prism to the nth inverse prism are away from the bottom surface of the lamp bead and are on the same horizontal plane, wherein an included angle between the light incident surface of the ith inverse prism and the horizontal plane is 157.5 degrees to 179.66 degrees, including end point values.
Optionally, be located the lamp pearl is towards optical structure one side, still include:
the light condensing structure is used for condensing the light emitted from the gap region between every two adjacent lamp beads.
Optionally, the light-condensing structure includes a plurality of light-condensing prisms.
Optionally, the direct type backlight module further includes:
and the diffusion film is positioned on one side of the optical structure, which is deviated from the lamp bead.
Optionally, the lamp bead is a Mini-LED lamp bead.
Correspondingly, the invention also provides a display device which comprises the direct type backlight module.
Compared with the prior art, the technical scheme provided by the invention at least has the following advantages:
the invention provides a direct type backlight module and a display device, wherein the direct type backlight module comprises: a substrate; the lamp beads are arranged on one surface of the substrate, and a gap area is formed between any two adjacent lamp beads; and at least one optical structure positioned in the light-emitting direction of the lamp beads, wherein each optical structure corresponds to at least one lamp bead, and the optical structure is used for guiding and irradiating part of the light-emitting of the lamp beads corresponding to the optical structure to the gap area at least on one side of the lamp beads corresponding to the optical structure.
From the above, the direct-type backlight module provided by the invention guides and irradiates part of the lamp beads corresponding to the direct-type backlight module to the gap region on at least one side of the lamp beads corresponding to the optical structure through the optical structure, so as to compensate the brightness at the gap between two adjacent main lamp beads, improve the problem of insufficient light mixing of the two adjacent main lamp beads in the gap region, further improve the problem of poor uniformity of an emergent surface light source of the direct-type backlight module, improve the brightness of the surface light source, and ensure that the display effect of the display device is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a conventional direct-type backlight module;
fig. 2 is a schematic structural diagram of a direct type backlight module according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another direct type backlight module according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another direct type backlight module according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of another direct type backlight module according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of another direct type backlight module according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of another direct type backlight module according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of another direct type backlight module according to an embodiment of the present disclosure;
fig. 9 is a schematic structural view of another direct type backlight module according to an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As described in the background art, the backlight module is divided into a side-type backlight module and a direct-type backlight module according to the incident position of the light source. The side-in backlight module is characterized in that a light-emitting device is arranged at the edge of a light guide plate arranged on the back of a liquid crystal panel, light emitted by the light-emitting device enters the light guide plate from the side face of the light guide plate, is emitted from a light-emitting surface of the light guide plate after being reflected and diffused, and then passes through an optical film group to form a surface light source to be provided for the liquid crystal panel. The direct type backlight module directly arranges a plurality of light-emitting devices on the back of the liquid crystal panel to directly form a surface light source for the liquid crystal panel, and the uniformity of the emergent surface light source formed by the existing direct type backlight module is poor.
As shown in fig. 1, a schematic structural diagram of a conventional direct type backlight module is shown, in which the direct type backlight module includes: the lamp comprises a substrate 1 and a plurality of lamp beads 2 arranged on one surface of the substrate 1. The in-process is crossed in the work of current straight following formula backlight unit, because the restriction of the luminous angle of lamp pearl 2 (as per lamp pearl corresponds the luminous angle that two arrows show in figure 1), mix luminance not enough between adjacent lamp pearl 2 and be the dark space, and then lead to the luminance homogeneity of the whole emergent area source of current straight following formula backlight unit relatively poor, influence display device's display effect.
Based on this, this application embodiment provides a straight following formula backlight unit and display device, has improved the poor problem of straight following formula backlight unit outgoing surface light source's homogeneity, guarantees that display device's display effect is high. In order to achieve the above object, the technical solutions provided by the embodiments of the present application are described in detail below, specifically with reference to fig. 2 to 10. In the following drawings, the light is indicated by a single-direction arrow emitted from the lamp bead and the optical structure.
Referring to fig. 2, a schematic structural diagram of a direct type backlight module according to an embodiment of the present disclosure is shown, where the direct type backlight module according to the embodiment of the present disclosure includes:
a substrate 100;
a plurality of beads 200 arranged on a surface of the substrate 100, wherein a gap region is formed between any two adjacent beads 200;
and at least one optical structure 300 located in the light-emitting direction of the lamp bead 200, wherein each optical structure 300 corresponds to at least one lamp bead 200, and the optical structure 300 is used for guiding and irradiating part of the light emitted from the lamp bead 200 corresponding to the optical structure to the gap area on at least one side of the lamp bead 200 corresponding to the optical structure.
It can be understood that the direct type backlight module provided by the embodiment of the application comprises a plurality of lamp beads arranged on the same surface of a substrate, and a gap area is arranged between any two adjacent lamp beads; in the light-emitting direction of lamp pearl, be provided with a plurality of optical structure on one side of the lamp pearl deviates from the base plate promptly, each optical structure can correspond at least one lamp pearl, and the lamp pearl that different optical structure corresponds can be different. Wherein, in straight following formula backlight unit course of operation, the direct outgoing of a part light-emitting of lamp pearl forms the partly of area source, and another part light-emitting of lamp pearl is then by the optical structure who corresponds guide to the clearance region of at least one side of this lamp pearl, and then can compensate the luminance of clearance department between two adjacent main lamp pearls, improve two adjacent main lamp pearls and mix the not enough problem of light in the clearance region, and then can improve the poor problem of homogeneity of straight following formula backlight unit outgoing area source, and can also improve the luminance of area source, guarantee that display device's display effect is high.
The light emitting of the lamp bead provided by the application is divided into two parts, namely, one part of the light emitting is directly emitted to form one part of a surface light source, and the other part of the light emitting of the lamp bead is guided to a gap region on at least one side of the lamp bead by a corresponding optical structure, wherein the part of the light emitting which is directly emitted to form the surface light source can be the light emitting of a central region of the lamp bead, and the part of the light emitting guided by the optical structure can be the light emitting of an edge region of the lamp bead, so that the light emitting of the edge region of the lamp bead is guided by the optical structure, the optical structure can be arranged right above the edge region of the lamp bead, and the problem that the optical structure shields the light emitting of the lamp bead does not need to be excessively considered, so that the shape of the optical structure can be optimally designed; meanwhile, the problem that the brightness of the surface light source finally formed is greatly influenced by the shielding of the lamp beads due to the fact that the optical structure is arranged right above the lamp beads can be avoided.
In an embodiment of the present application, the optical structure that this application provided can set up with lamp pearl one-to-one, and optical structure can design for inverse prism. Referring to fig. 3, a schematic structural diagram of another direct-type backlight module provided in the embodiment of the present application is shown, wherein the optical structures 300 correspond to the lamp beads 200 one to one, where the optical structures 300 include first inverse prisms 301 to nth inverse prisms 30N that are located on a same plane parallel to the substrate 100 and are sequentially arranged in a direction away from and corresponding to the lamp beads 200, where N is an integer not less than 1.
As shown in fig. 3, the first inverse prism 301 to the nth inverse prism 30N provided in the embodiment of the present application are located on the same plane, and in a direction away from the corresponding lamp bead 200 (i.e., a direction extending outward from the lamp bead 200 as a center, such as an X direction corresponding to each of the two lamp beads shown in fig. 3), the first inverse prism 301 to the nth inverse prism 30N are sequentially arranged.
It can be understood, in straight following formula backlight unit course of operation, the regional direct outgoing of central authorities of lamp pearl 200 forms the partly of area source, and the regional partial light-emitting of edge of lamp pearl 200, then shine to a side clearance region of this lamp pearl 200 by the guide of first inverse prism 301 to the N inverse prism 30N, with carry out luminance compensation to this clearance region, and then guarantee that the luminance homogeneity of the regional area source that light-emitting of the regional light-emitting of central authorities of lamp pearl and adjacent lamp pearl clearance region formed is high, and improved the whole luminance of area source simultaneously.
Further, in order to guarantee that the gap region around the lamp bead all carries out brightness compensation, the reverse prism provided by the embodiment of the application surrounds the lamp bead, and guides the light-emitting of the edge region of the lamp bead to the gap region around the lamp bead. Fig. 4 is a schematic structural diagram of another direct type backlight module provided in the embodiment of the present application, wherein an ith inverse prism is annular and is disposed around the lamp bead 200;
the ith inverse prism is of an integral structure, or the ith inverse prism comprises a plurality of ith sub-inverse prisms in the annular direction, and i is a positive integer not greater than N.
It can be understood that, as shown in fig. 4, each of the first inverse prism 301 to the nth inverse prism 30N is annular and disposed around the lamp bead 200, and further, in the working process of the direct-type backlight module, the inverse prisms guide the light emitted from the peripheral edge region of the lamp bead 200 to the peripheral gap region of the lamp bead 200, so as to expand the range of the optical structure for brightness compensation of the gap region, and further improve the uniformity of the surface light source.
In order to ensure that the compensation brightness of the gap area of the lamp bead is optimal when the optical structure provided by the embodiment of the present application is an inverse prism, each parameter of the inverse prism provided by the embodiment of the present application is explained in detail with reference to fig. 5, fig. 5 is a schematic structural diagram of another direct type backlight module provided by the embodiment of the present application, wherein the first inverse prism 301 to the nth inverse prism 30N provided by the embodiment of the present application deviate from the bottom surfaces of the lamp bead 200 at the same horizontal plane, and the height h of the first inverse prism 301 to the nth inverse prism 30N on the horizontal plane is in a decreasing trend.
As shown in fig. 5, in an embodiment of the present application, the present application provides an ith inverse prism having a height h of 7-20 microns, inclusive, and i is a positive integer no greater than N. And, the first inverse prism 301 to the nth inverse prism 30N provided by the embodiment of the present application deviate from the bottom surface of the lamp bead 200 is on the same horizontal plane, wherein, on any cross section perpendicular to the horizontal plane, the bottom center distance P between any two adjacent inverse prisms is 14 micrometers-40 micrometers, including end point values, optionally, the distance P may be 24 micrometers.
As shown in fig. 5, in an embodiment of the present application, the first inverse prism 301 to the nth inverse prism 30N provided by the present application deviate from the bottom surface of the lamp bead 200 and are on the same horizontal plane, wherein an included angle a between the light incident surface of the ith inverse prism and the horizontal plane is 157.5 degrees to 179.66 degrees, inclusive. The included angle a provided in the embodiment of the present application can be obtained according to the following formula one:
a is 180-1/2 (arctan (L/(H-H/2))) (formula I)
H is a vertical distance between the lamp beads and a horizontal plane on which the bottom surfaces of the first inverse prism 301 to the nth inverse prism 30N are located, and L is a half of a distance between two adjacent lamp beads. It can be seen that when H is approximated to H (calculated as H ═ H) in the examples of the present application, a ═ 179.66 degrees can be obtained; and when H is 2L, a is 157.5 degrees, so that an included angle a between the light incident surface of the i-th inverse prism and the horizontal plane on which the bottom surfaces of the first inverse prism 301 to the N-th inverse prism 30N are located is 157.5 degrees to 179.66 degrees, inclusive.
In this application embodiment, can also set up spotlight structure in lamp pearl light-emitting one side to improve the luminance of the area source of straight following formula backlight unit outgoing with the light-emitting gathering of clearance region department between the adjacent lamp pearl. Referring to fig. 6, a schematic structural diagram of another direct type backlight module provided in the embodiment of the present application is shown, where the direct type backlight module is located on a side of the bead 200 facing the optical structure 300, and further includes:
at least one light-focusing structure 400, the light-focusing structure 400 is used for focusing the light emitted from the gap region between two adjacent lamp beads 200.
It can be understood that, in the working process of the direct type backlight module provided by the embodiment of the present application, part of the light emitted from the lamp bead 200 is directly emitted as a part of the surface light source, and the other part of the light is guided to the gap region at least one side of the lamp bead 200 by the optical structure 300 to compensate the brightness of the gap region. Then, the light emitted from the gap region is collected by the light collecting structure 400 and emitted as a part of the surface light source, so as to improve the brightness of the light emitted from the surface light source.
As shown in fig. 6, the light-condensing structure 400 provided in the embodiment of the present application includes a plurality of light-condensing prisms 410, wherein the light emitted from the gap region is condensed by the plurality of light-condensing prisms 410 and then emitted as a part of the surface light source. It should be noted that the coverage area of all the light-collecting prisms 410 provided in the embodiment of the present application may completely correspond to the gap area formed between all the lamp beads 200 on the substrate 100, or partially correspond to the gap area formed between all the lamp beads 200 on the substrate 100, and the present application is not particularly limited thereto; moreover, the light-gathering structure 400 provided in the embodiment of the present application is not limited to the light-gathering prism 410, and may be in other specific structural shapes in other embodiments of the present application, which need to be specifically designed according to practical applications.
Referring to fig. 7, a schematic structural diagram of another direct type backlight module provided in the embodiment of the present application is shown, where the direct type backlight module further includes:
and the diffusion film 500 is positioned on one side of the optical structure 300, which is far away from the lamp bead 200.
It can be understood that, the direct type backlight module provided in the embodiment of the present application can further improve the uniformity of the surface light source emitted from the direct type backlight module by disposing the diffusion film 500 on the optical structure 300. The optical structure 300 provided by the embodiment of the present application can be directly fixed on one side of the diffusion film 500 facing the lamp bead 200.
Fig. 8 is a schematic structural view of another direct type backlight module according to an embodiment of the present disclosure, wherein when the direct type backlight module includes a light-gathering structure 400, the light-gathering structure 400 may be fixed on a diffusion film 500.
It should be noted that the light-gathering structure provided in the embodiment of the present application may be fixed on a side of the diffusion film away from the optical structure, or the light-gathering structure may be fixed on a side of the diffusion film facing the optical structure.
Referring to fig. 9, it is a schematic structural view of another direct type backlight module provided in the embodiment of the present application, wherein the direct type backlight module provided in the embodiment of the present application can further include a brightness enhancement film 600, wherein the brightness enhancement film 600 is disposed on one side of the diffusion film 500 away from the lamp bead 200, and the brightness of the surface light source exiting from the direct type backlight module is further improved by the disposition of the brightness enhancement film 600.
The direct type backlight module further comprises a supporting frame for supporting the structures such as the substrate, the diffusion film and the brightness enhancement film.
In any of the above embodiments of the present application, the lamp bead in the embodiment of the present application is a Mini-LED lamp bead. The substrate provided by the embodiment of the application is a substrate arranged with a driving circuit, a Mini-LED (Light Emitting Diode) chip is arranged on the substrate, and then the fluorescent powder is fixed by spraying or film pressing to obtain the direct type backlight module with the Mini-LED lamp beads. The direct type backlight module with the Mini-LED lamp beads provided by the embodiment of the application is combined with a Local Dimming backlight driving mode, high dynamic range display can be achieved on the basis of improving the display effect of the display device, and backlight power consumption can be reduced.
Correspondingly, the embodiment of the application also provides a display device, and the display device comprises the direct type backlight module provided by any one of the embodiments.
Referring to fig. 10, a schematic structural diagram of a display device according to an embodiment of the present application is shown, where the display device includes:
a display panel 1000;
and the direct type backlight module 2000 provided in any of the above embodiments.
The display panel includes a color film substrate and an array substrate which are oppositely arranged, and a liquid crystal layer located between the color film substrate and the array substrate, which is the same as the prior art, and redundant description is not repeated.
The embodiment of the application provides a straight following formula backlight unit and display device, straight following formula backlight unit includes: a substrate; the lamp beads are arranged on one surface of the substrate, and a gap area is formed between any two adjacent lamp beads; and at least one optical structure positioned in the light-emitting direction of the lamp beads, wherein each optical structure corresponds to at least one lamp bead, and the optical structure is used for guiding and irradiating part of the light-emitting of the lamp beads corresponding to the optical structure to the gap area at least on one side of the lamp beads corresponding to the optical structure.
It can be known from the above content that the direct type backlight module that this application embodiment provided will be rather than the partial light-emitting of the lamp pearl that corresponds through optical structure, the guide shines to the clearance region of at least one side of the lamp pearl that corresponds with optical structure, and then, in order to compensate the luminance of clearance department between two adjacent main lamp pearls, improve two adjacent main lamp pearls and mix the not enough problem of light in the clearance region, and then can improve the poor problem of homogeneity of direct type backlight module outgoing surface light source, and can also improve the luminance of surface light source, guarantee that display device's display effect is high.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. A direct type backlight module is characterized by comprising:
a substrate;
the lamp beads are arranged on one surface of the substrate, and a gap area is formed between any two adjacent lamp beads;
the optical structure is used for guiding and irradiating part of the light of the lamp bead corresponding to the optical structure to a gap area on at least one side of the lamp bead corresponding to the optical structure, and the brightness of the gap between two adjacent lamp beads is compensated;
the optical structure with the lamp pearl one-to-one, wherein, the optical structure including be located with on the coplanar that the base plate is parallel, and keeping away from rather than corresponding first inverse prism to the N inverse prism that sets gradually in the lamp pearl direction, N is for being not less than 1 integer.
2. The direct type backlight module as claimed in claim 1, wherein the ith inverse prism is annular and disposed around the lamp bead;
the ith inverse prism is of an integral structure, or the ith inverse prism comprises a plurality of ith sub-inverse prisms in the annular direction, and i is a positive integer not greater than N.
3. The direct-type backlight module as claimed in claim 1, wherein the first to nth inverse prisms are on the same horizontal plane away from the bottom surface of the lamp bead, and the heights of the first to nth inverse prisms are decreasing in a direction perpendicular to the horizontal plane.
4. The direct type backlight module according to claim 3, wherein the ith inverse prism has a height of 7-20 μm inclusive, and i is a positive integer not greater than N.
5. The direct type backlight module according to claim 1, wherein the first to nth inverse prisms are on the same horizontal plane away from the bottom surface of the lamp bead, and in any cross section perpendicular to the horizontal plane, the distance between centers of bottom edges of any two adjacent inverse prisms is 14 to 40 micrometers, inclusive.
6. The direct type backlight module according to claim 1, wherein the first to nth inverse prisms are on the same horizontal plane away from the bottom surface of the lamp bead, and an included angle between the light incident surface of the ith inverse prism and the horizontal plane is 157.5 degrees to 179.66 degrees, inclusive.
7. The direct type backlight module according to claim 1, further comprising:
the light condensing structure is used for condensing the light emitted from the gap region between every two adjacent lamp beads.
8. The direct type backlight module according to claim 7, wherein the light-collecting structure comprises a plurality of light-collecting prisms.
9. The direct type backlight module according to claim 1, further comprising:
and the diffusion film is positioned on one side of the optical structure, which is deviated from the lamp bead.
10. The direct type backlight module of claim 1, wherein the beads are Mini-LED beads.
11. A display device, comprising the direct type backlight module according to any one of claims 1 to 10.
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| CN201811442026.6A CN109283745B (en) | 2018-11-29 | 2018-11-29 | Direct type backlight module and display device |
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| CN109283745B true CN109283745B (en) | 2022-03-01 |
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| CN111208673B (en) * | 2020-01-17 | 2021-02-02 | 深圳市华星光电半导体显示技术有限公司 | Backlight module and display panel |
| CN114187835A (en) * | 2021-12-10 | 2022-03-15 | Tcl华星光电技术有限公司 | Backlight module and display device |
| CN114740652B (en) * | 2022-01-19 | 2024-01-09 | 京东方科技集团股份有限公司 | Backlight module, display panel and display device |
| CN114594630B (en) * | 2022-03-03 | 2023-05-02 | 厦门天马微电子有限公司 | Backlight module and display device |
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