CN109188768B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN109188768B CN109188768B CN201811158191.9A CN201811158191A CN109188768B CN 109188768 B CN109188768 B CN 109188768B CN 201811158191 A CN201811158191 A CN 201811158191A CN 109188768 B CN109188768 B CN 109188768B
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- circuit board
- backlight module
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0083—Details of electrical connections of light sources to drivers, circuit boards, or the like
Abstract
The invention discloses a backlight module and a display device, comprising: a light bar and a light guide plate; the light guide plate comprises a light incident surface and a light emergent surface; the lamp strip includes: the lamp comprises a first circuit board and a plurality of lamp beads; the plane of the first circuit board is vertical to the plane of the light guide plate; one side of the first circuit board, which faces the lamp beads, comprises a plurality of pin units; the pin unit comprises a P electrode pin and an N electrode pin; the lamp pearl includes: the semiconductor device comprises a PN junction diode, a P electrode, an N electrode and a packaging layer; the P electrode and the N electrode are positioned on one side of the PN junction diode facing the first circuit board; the P electrode is connected with the P electrode pin through the first conductive part, and the N electrode is connected with the N electrode pin through the second conductive part; the lamp bead is provided with a light-emitting surface and at least one side surface, and the side surface is connected with the light-emitting surface; the light emitting surface of the lamp bead faces the light incident surface of the light guide plate; the packaging layer covers the side face and exposes the luminous face. Compared with the prior art, the narrow frame of the backlight module is facilitated, and the quality of the backlight module is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a 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 in mobile phones, digital cameras, computer screens, and notebook computer screens. The display device provided by the prior art includes a housing and a backlight module disposed in the housing. The working principle of the conventional display device is that a driving voltage is applied to two glass substrates to control the rotation of liquid crystal molecules of a liquid crystal layer, and light rays of a backlight module are refracted out to generate a picture. Since the liquid crystal does not emit light, the backlight module is one of the key components of the liquid crystal display device because the backlight module provides a light source to display images.
The backlight module is divided into a side-in type backlight module and a direct type backlight module according to different incident positions of the light source. The direct type backlight module is arranged behind the liquid crystal layer to directly form a surface light source to be provided for the liquid crystal display device, and the direct type backlight module has larger thickness and is generally used for large-size display devices. The side-in backlight module is characterized in that a lamp strip of a backlight source is arranged at the edge of a back plate at the rear side of a panel, light rays emitted by the lamp strip enter a light guide plate from a light inlet face at one side of the light guide plate, are emitted from a light outlet face of the light guide plate after reflection and diffusion, and then pass through an optical film group to form a surface light source to provide light.
The side-in type backlight module is usually used in a small and medium sized display device, and it is one of the research directions of researchers to continuously optimize the structure of the side-in type backlight module and provide a high quality side-in type backlight module.
Disclosure of Invention
In view of the above, the present invention provides a backlight module and a display device.
The invention provides a backlight module, comprising: a light bar and a light guide plate; the light guide plate comprises a light incident surface and a light emergent surface which are intersected; the lamp strip includes: the lamp comprises a first circuit board and a plurality of lamp beads; the plane of the first circuit board is vertical to the plane of the light guide plate; one side of the first circuit board, which faces the lamp beads, comprises a plurality of pin units, and the pin units are electrically connected with the lamp beads in a one-to-one correspondence manner; the pin unit comprises a P electrode pin and an N electrode pin; the lamp pearl includes: the semiconductor device comprises a PN junction diode, a P electrode, an N electrode and a packaging layer; the P electrode and the N electrode are positioned on one side of the PN junction diode facing the first circuit board; the P electrode is connected with the P electrode pin through the first conductive part, and the N electrode is connected with the N electrode pin through the second conductive part; the lamp bead is provided with a light-emitting surface and at least one side surface, and the side surface is connected with the light-emitting surface; the light emitting surface of the lamp bead faces the light incident surface of the light guide plate; the packaging layer covers the side face and exposes the luminous face.
The invention also provides a display device, which comprises the backlight module and a display panel; the display panel is arranged on one side of the light emergent surface of the light guide plate.
Compared with the prior art, the backlight module and the display device provided by the invention at least realize the following beneficial effects:
according to the invention, the lamp beads are directly punched on the first circuit board. Specifically, the PN junction diode is provided with a P electrode and an N electrode, which are directly electrically connected to a P electrode pin and an N electrode pin of the first circuit board through conductive portions, respectively. Need not to encapsulate PN junction diode in the lead frame, but directly make the piece on first circuit board with the lamp pearl, therefore can reduce the volume of lamp pearl, be favorable to backlight unit's narrow frame. The packaging layer only covers the side face of the lamp bead, and does not need to cover the light emitting face of the lamp bead, so that the width of a non-display area can be further reduced, and the narrow frame of the backlight module is further facilitated. Need not to set up the lead frame in the lamp pearl and the encapsulation layer only covers the side of lamp pearl, the thermal diffusivity of lamp pearl is better, has promoted backlight unit's quality. No gold thread is arranged in the lamp bead, so that the reliability of the lamp bead can be improved, and the quality of the backlight module is further improved.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic cross-sectional view illustrating a backlight module provided in the prior art;
FIG. 2 is a schematic diagram of the construction of the light source of FIG. 1;
fig. 3 is a schematic perspective view of a backlight module according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional view illustrating a backlight module according to an embodiment of the invention;
FIG. 5 is a schematic cross-sectional view illustrating another backlight module according to an embodiment of the present invention;
FIG. 6 is a schematic view of a partial structure of a backlight module according to another embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view illustrating another backlight module according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a first circuit board of a backlight module according to another embodiment of the present invention;
fig. 9 is a schematic structural diagram of a first circuit board of a backlight module according to another embodiment of the present invention;
FIG. 10 is a schematic cross-sectional view illustrating another backlight module according to an embodiment of the present invention;
fig. 11 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic cross-sectional structure of a backlight module provided in the prior art, and fig. 2 is a schematic structural view of a light source in fig. 1.
Research personnel find that, in the backlight module provided by the prior art, the backlight module comprises a light bar 01 and a light guide plate 02, the light bar 01 comprises a substrate 011 and a light source 012, and light emitted by the light source 012 enters the light guide plate through a light incident surface 021 of the light guide plate 02 and then exits from a light emergent surface 022 of the light guide plate 02. The light source 012 has a large volume, which results in a large frame width D0 of the backlight module. Specifically, the light source 012 includes a lead frame 031, the lead frame 031 forms an accommodation space, a light emitting chip 032 is disposed in the lead frame 031, and the light emitting chip 032 can emit light after being powered on. The light source 012 further includes a chip electrode 033, a light source electrode 012 is disposed outside the lead frame 031, and the chip electrode 033 and the light source electrode 012 are electrically connected by a gold wire 034. The accommodating space of the lead frame 031 is also provided with a packaging adhesive 036 containing phosphor.
Research personnel find that the thickness of the display device is reduced by adopting the lateral backlight module, but the area of a non-display area surrounding the display area in the display device is increased due to the large volume of the light source 012, which is not beneficial to realizing the narrow frame of the display device. Further, the gold wire 034 is easily broken in the light source 012, and thus the reliability is low. And in the light source 012, the light emitting chip 032 is covered with the packaging adhesive 036 and disposed in the accommodating space of the lead frame 031, so that the heat dissipation of the light source 012 is poor.
Referring to fig. 3 and 4, fig. 3 is a schematic perspective view of a backlight module according to an embodiment of the present invention, and fig. 4 is a schematic cross-sectional view of the backlight module according to the embodiment of the present invention. The present embodiment provides a backlight module, including:
a light bar 10 and a light guide plate 20;
the light guide plate 20 includes a light incident surface 21 and a light emitting surface 22, and the light incident surface 21 and the light emitting surface 22 intersect;
the light bar 10 includes: a first circuit board 11 and a plurality of lamp beads 12;
the plane of the first circuit board 11 is perpendicular to the plane of the light guide plate 20; one side of the first circuit board 11 facing the lamp beads 12 comprises a plurality of pin units 101, and the pin units 101 are electrically connected with the lamp beads 12 in a one-to-one correspondence manner; the pin unit 101 includes a P electrode pin 101P and an N electrode pin 101N;
the lamp pearl 12 includes: a PN junction diode 121, a P electrode 122, an N electrode 123 and a packaging layer 124; the P electrode 122 and the N electrode 123 are located on the side of the PN junction diode 121 facing the first circuit board 11;
the P electrode 122 is connected to the P electrode pin 101P through the first conductive part 120A, and the N electrode 123 is connected to the N electrode pin 101N through the second conductive part 120B;
the lamp bead 12 is provided with a light-emitting surface 125 and at least one side surface 126, and the side surface 126 is connected with the light-emitting surface 125;
the light emitting surface 125 of the lamp bead 12 faces the light incident surface 21 of the light guide plate 20;
the encapsulation layer 124 covers the side surface 126 and exposes the light emitting surface 125.
In the backlight module provided in this embodiment, the light guide plate 20 is usually made of a material with very high reflectivity and no light absorption, and the light guide plate has a plurality of light guide points (not shown), so that when light irradiates each light guide point, the reflected light is diffused toward different angles through the light guide points, and further the reflection condition is destroyed and the light is emitted from the light emitting surface of the light guide plate. The light guide plate 20 can emit light uniformly through the light guide points. The light guide plate includes a light incident surface 21 and a light emitting surface 22, the light bar 10 can emit light, and when light emitted from the light bar 10 enters the light incident surface 21 of the light guide plate 20, the light is diffused by the light guide points and then emitted from the light emitting surface 22.
The lamp bead 12 includes a PN junction diode 121, and in general, an N-type semiconductor and a P-type semiconductor are formed on both sides of one semiconductor by diffusing different impurities, and a very thin space charge region is formed at a boundary between the N-type semiconductor and the P-type semiconductor, and the space charge region is a PN junction. The lamp bead further comprises a P electrode and an N electrode, and the P electrode and the N electrode are electrically connected with the pin unit 101 through the conductive part. Specifically, the conductive portions may include a first conductive portion 120A and a second conductive portion 120B.
The P electrode of the lamp bead is electrically connected with the P electrode pin 101P through the first conductive part 120A, and the N electrode 123 is electrically connected with the N electrode pin 101N through the second conductive part 120B. The lamp bead 12 has a light emitting surface 125, the light emitting surface 125 faces the light incident surface 21 of the light guide plate, and the light rays of the light emitting surface 125 enter the light incident surface 21 of the light guide plate and exit through the light exiting surface 22 of the light guide plate, so as to provide a uniform surface light source.
The lamp bead further comprises at least one side surface 126, and the side surface 126 is connected with the light-emitting surface 125. Encapsulation layer 124 covers side 126, and encapsulation layer 124 can not cover light emitting surface 125 and expose light emitting surface 125, and through this kind of setting, encapsulation layer 124 can not influence the light that light emitting surface 125 of lamp pearl 12 sent to improve the utilization ratio of light.
In this embodiment, the lamp beads 20 are directly punched on the first circuit board 11. Specifically, the PN junction diode 121 is provided with a P electrode and an N electrode, which are directly electrically connected to the P electrode pin 101P and the N electrode pin 101N of the first circuit board 11 through conductive portions, respectively. Compared with the prior art, the backlight module provided by the embodiment at least has the following beneficial effects:
1. need not to encapsulate PN junction diode 121 in the lead frame, but directly play the piece with lamp pearl 20 on first circuit board 11, therefore can reduce the volume of lamp pearl 20, be favorable to backlight unit's narrow frame.
2. The packaging layer 124 only covers the side surface 126 of the lamp bead, and does not need to cover the light emitting surface 125 of the lamp bead 12, so that the width D1 of the non-display area can be further reduced, the numerical value of D1 can be smaller than 2.0mm, and the narrow frame of the backlight module is further facilitated.
3. The lead frame is not required to be arranged in the lamp bead, the packaging layer 124 only covers the side face 126 of the lamp bead, the heat dissipation performance of the lamp bead is good, and the quality of the backlight module is improved.
4. No gold thread is arranged in the lamp bead, so that the reliability of the lamp bead can be improved, and the quality of the backlight module is further improved.
In some optional embodiments, please refer to fig. 5, and fig. 5 is a schematic cross-sectional structure diagram of another backlight module provided in the embodiments of the present invention. The lamp bead 12 comprises a fluorescent film 127, and the fluorescent film 127 is located on one side of the PN junction diode 121 departing from the first circuit board 11.
Under general conditions, the fluorescent screen can promote the luminance visual angle, and in this embodiment, the fluorescent screen setting deviates from one side of first circuit board 11 at the PN junction, utilizes the inside fluorescence molecule of fluorescent screen to be aroused the characteristic that back light can launch at random to can promote the luminance at the big visual angle of backlight unit, promote the display quality.
Optionally, the material of the encapsulation layer 124 includes silicon gel. The silica gel has good insulating property, stable chemical property and no combustion, and can prevent the leakage of the PN junction diode 121. And the silica gel has good mechanical property, and can protect the PN junction diode 121.
In some alternative embodiments, referring to fig. 3 and 4, the materials of the first conductive portion 120A and the second conductive portion 120B include: anisotropic conductive adhesive.
The square conductive adhesive can be coated between the P electrode and the P electrode pin 101P and between the N electrode and the N electrode pin 101N, and has the functions of unidirectional conduction and gluing fixation, so that the lamp bead is electrically connected with the first circuit board, and the first circuit board provides proper voltage for the lamp bead; on the other hand makes lamp pearl and first circuit board fixed connection again, makes the difficult first circuit board of following of lamp pearl break away from.
In some optional embodiments, please refer to fig. 6 and 7, in which fig. 6 is a schematic partial structure diagram of another backlight module provided in the embodiment of the present invention, and fig. 7 is a schematic cross-sectional structure diagram of another backlight module provided in the embodiment of the present invention. One side of the first circuit board 11, which faces away from the lamp bead 12, includes a plurality of terminal units 102, and each terminal unit 102 includes a P terminal 102P and an N terminal 102N;
the terminal unit 102 and the pin unit 101 are electrically connected in a one-to-one correspondence manner, the P terminal 102P is electrically connected with the P electrode pin 101P, and the N terminal 102N is electrically connected with the N electrode pin 101N;
the backlight module further comprises a second circuit board 30;
the second circuit board 30 includes a connection region 31, the connection region 31 being disposed in parallel with the light guide plate 20; the connection region 31 includes a signal lines 310;
the terminal unit 102 and the signal line 310 are electrically connected by the conductive connection portion 32;
wherein a is a positive integer.
In this embodiment, the backlight module includes a second circuit board 30, the second circuit board 30 is disposed in parallel with the light guide plate 22, the second circuit board 30 includes a connection region 31, and the connection region 31 is disposed in parallel with the light guide plate 22. The connection region 31 is used to electrically connect the first circuit board 11.
The connection region 31 includes a signal lines for providing electrical signals to the lamp beads. In this embodiment, a is described as an example of 2.
Optionally, the second circuit board 30 further includes a bending region 32, and when the backlight module is applied to a terminal display device, the bending region 32 may be in a bending state.
In this embodiment, the terminal unit 102 and the signal line 310 are electrically connected through the conductive connection portion 32, and optionally, the conductive connection portion 32 is located on one side of the first circuit board 11 away from the lamp bead 12. Because electrically conductive connecting portion 32 is located one side that first circuit board 11 deviates from lamp pearl 12, therefore do not occupy the space between two adjacent lamp pearls, be favorable to comparatively densely with the lamp pearl setting, promote the quantity of the lamp pearl in the unit area.
Note that, in fig. 6, the conductive connection portion 32 is omitted for clarity of illustrating the technical solution of the present embodiment.
In the backlight module provided in this embodiment, the conductive connecting portion 32 performs a conductive function on one hand, so that the terminal unit 102 is electrically connected to the signal line 310; on the other hand, the conductive connection portion 32 plays a role of supporting, so that the planes of the first circuit board 11 and the second circuit board 30 are perpendicular to each other, and the first circuit board 11 is prevented from tilting, thereby further reducing the frame of the backlight module.
Optionally, the conductive connecting portion 32 is made of solder, the solder is a metal solder with a low melting point, and the solder and the electronic component can be electrically contacted with the electrocautery iron during electronic operation, and the electronic component can be welded.
Optionally, the second circuit board 30 is a flexible circuit board. The flexible circuit board can be bent and folded without damaging the wires, and the wires can be randomly arranged according to the spatial layout, so that the components and the wires are connected and integrated, the flexible circuit board can reduce the volume and the weight of the backlight module, and the reliability of the backlight module can be better improved.
In some optional embodiments, please refer to fig. 6, fig. 7 and fig. 8, and fig. 8 is a schematic structural diagram of a first circuit board of a backlight module according to still another embodiment of the present invention. In some optional implementations of the present invention, the plurality of pin units 101 are divided into a pin groups 40, and each pin group 40 includes at least two pin units 101;
the first circuit board 11 includes a P connection lines 51 and a N connection lines 52;
in the same pin group 40, the P electrode pins 101P of at least two pin units 101 are electrically connected to the same P connection line 51, and the N electrode pins 101N of at least two pin units 101 are electrically connected to the same N connection line 52.
In this embodiment, only a is 2, and each lead group 40 includes two lead units 101. It is understood that a is a positive integer, a may be 1, 3, 4, and so on, and each pin group 40 may include three or more pin units 101, which is not described in detail in this embodiment.
In this embodiment, the pin units 101 are arranged in groups, the P electrode pins 101P in the same pin group 40 are electrically connected to the same P connection line 51, and the N electrode pins 101N in the same pin group 40 are electrically connected to the same N connection line 52. That is, the lamp beads electrically connected to the same pin group 40 are connected in series, and the lamp beads electrically connected to the same pin group 40 are simultaneously lighted or extinguished. On one hand, the lamp beads electrically connected with different pin groups 40 can be respectively controlled, so that the functions of the backlight module are enriched; on the other hand, the lamp beads electrically connected with the same pin group 40 only need to provide one group of electric signals, so that the ports of the electric signals can be reduced, and the structure of the backlight module is simplified.
Also, in the present embodiment, the P connection line 51 and the N connection line 52 are both provided in the first circuit board 11, and the P connection line 51 and the N connection line 52 need not be provided in the second circuit board 30. The second circuit board 30 is only provided with the signal line 310, and the signal line 310 transmits electrical signals for the P connecting line 51 and the N connecting line 52, so that the routing structure of the second circuit board 30 is greatly simplified. Because the routing structure of the second circuit board 30 is simple, the width W of the connection area 31 can be set to be narrow, and the value of W can be smaller than 1.0mm, thereby further reducing the frame width of the backlight module and being beneficial to narrowing the frame of the backlight module.
Note that the pin units 101 may not be arranged in groups, and the present invention will be described below with an example in which a is 1. In some optional embodiments, please refer to fig. 6, fig. 7 and fig. 9, and fig. 9 is a schematic structural diagram of a first circuit board of a backlight module according to another embodiment of the present invention. In the backlight module provided in this embodiment, the plurality of pin units 101 are in one group, the P electrode pins 101P of the plurality of pin units 101 are electrically connected to the same P connection line 51, and the N electrode pins 101N of the plurality of pin units 101 are electrically connected to the same N connection line 52. In the backlight module that this embodiment provided, a plurality of lamp pearls 12 in lamp strip 10 are established ties, and a plurality of lamp pearls 12 are luminous simultaneously or are extinguish. The backlight module only needs to provide one group of electric signals, so that the ports of the electric signals can be further reduced, and the structure of the backlight module is simplified.
It should be noted that fig. 8 and fig. 9 are only exemplary illustrations of the grouping of the pin units 101.
Alternatively, the second circuit board 30 includes only one conductive layer, and the a signal lines 310 are located on the conductive layer. Since the wiring structure in the second circuit board 30 is simple, only one conductive layer needs to be arranged for manufacturing the a signal lines 310, the film structure of the second circuit board 30 is simplified, and the process and materials for manufacturing the second circuit board 30 are saved. Moreover, the film structure of the second circuit board 30 is simplified, so that the flexibility of the second circuit board 30 can be improved, and the risk of peeling off each film of the second circuit board 30 can be reduced.
In some optional embodiments, please refer to fig. 10, fig. 10 is a schematic cross-sectional structure diagram of another backlight module according to an embodiment of the present invention.
In this embodiment, the backlight module further includes a frame 61, a reflective sheet 62, a prism sheet 63, a lower diffusion sheet 64, and an upper diffusion sheet 65;
the frame body 61 forms an accommodating space for accommodating the light bar 10, the light guide plate 20, the reflective sheet 62, the prism sheet 63, the lower diffusion sheet 64 and the upper diffusion sheet 65;
the reflective sheet 62, the light guide plate 20, the lower diffusion sheet 64, the prism sheet 63, and the upper diffusion sheet 65 are sequentially stacked.
In the backlight module provided by the embodiment, the diffusion sheet has the working principle that the light source is atomized by means of refraction and reflection of the diffusion substance, and light is concentrated to the front face from small-angle emergent light so as to improve the front luminance. The lower diffusion sheet is mainly used for concentrating the light emitted from the light guide plate and uniformly projecting the light on the prism sheet, while the upper diffusion sheet is mainly used for atomizing the light emitted from the prism sheet and uniformly transmitting the light, and the upper diffusion sheet also can play a role in protecting the prism sheet.
The invention also provides a display device, which comprises the backlight module and a display panel; the display panel is disposed at one side of the light emitting surface 22 of the light guide plate 20. Referring to fig. 11, fig. 11 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the invention, and the display device provided in fig. 11 includes a backlight module 100 and a display panel 200 according to any embodiment of the invention. The backlight module 100 provides a surface light source for the display panel 200. The display panel 200 may be a liquid crystal display panel, and the detailed structure of the display panel 200 is not described herein again in this embodiment.
In addition, the display device provided in this embodiment may also be a terminal device, such as a mobile phone, a computer, a television, a vehicle-mounted display device, and other display devices with a display function, which is not limited in this disclosure. The display device provided by the embodiment of the present invention has the beneficial effects of the backlight module provided by the embodiment of the present invention, and specific reference may be made to the specific description of the backlight module in the foregoing embodiments, and details of the embodiment are not repeated herein.
As can be seen from the foregoing embodiments, the backlight module and the display device provided in the foregoing embodiments of the present invention at least achieve the following advantages:
according to the invention, the lamp beads are directly punched on the first circuit board. Specifically, the PN junction diode is provided with a P electrode and an N electrode, which are directly electrically connected to a P electrode pin and an N electrode pin of the first circuit board through conductive portions, respectively. Compared with the prior art, the PN junction diode is not required to be packaged in the lead frame, but the lamp bead is directly arranged on the first circuit board, so that the size of the lamp bead can be reduced, and the narrow frame of the backlight module is facilitated. The packaging layer only covers the side face of the lamp bead, and does not need to cover the light emitting face of the lamp bead, so that the width of a non-display area can be further reduced, and the narrow frame of the backlight module is further facilitated. Need not to set up the lead frame in the lamp pearl and the encapsulation layer only covers the side of lamp pearl, the thermal diffusivity of lamp pearl is better, has promoted backlight unit's quality. No gold thread is arranged in the lamp bead, so that the reliability of the lamp bead can be improved, and the quality of the backlight module is further improved.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. A backlight module, comprising:
a light bar and a light guide plate;
the light guide plate comprises a light incident surface and a light emergent surface, and the light incident surface is intersected with the light emergent surface;
the lamp strip includes: the lamp comprises a first circuit board and a plurality of lamp beads;
the plane where the first circuit board is located is perpendicular to the plane where the light guide plate is located; one side of the first circuit board, which faces the lamp beads, comprises a plurality of pin units, and the pin units are electrically connected with the lamp beads in a one-to-one correspondence manner; the pin unit comprises a P electrode pin and an N electrode pin;
the lamp pearl includes: the semiconductor device comprises a PN junction diode, a P electrode, an N electrode and a packaging layer; the P electrode and the N electrode are positioned on one side of the PN junction diode facing the first circuit board;
the P electrode is connected with the P electrode pin through a first conductive part, and the N electrode is connected with the N electrode pin through a second conductive part;
the lamp bead is provided with a light-emitting surface and at least one side surface, and the side surface is connected with the light-emitting surface;
the light emitting surface of the lamp bead faces the light incident surface of the light guide plate;
the packaging layer covers the side face and exposes the luminous face;
one side of the first circuit board, which is far away from the lamp bead, comprises a plurality of terminal units, and each terminal unit comprises a P terminal and an N terminal;
the terminal units are electrically connected with the pin units in a one-to-one correspondence mode, the P terminal is electrically connected with the P electrode pin, and the N terminal is electrically connected with the N electrode pin;
the backlight module also comprises a second circuit board;
the second circuit board comprises a connecting area, and the connecting area and the light guide plate are arranged in parallel; the connection region includes a signal lines;
the terminal unit and the signal line are electrically connected through a conductive connection part;
wherein a is a positive integer;
the conductive connecting part is positioned on one side of the first circuit board, which deviates from the lamp bead.
2. The backlight module according to claim 1,
the lamp pearl includes the fluorescent screen, the fluorescent screen is located the PN junction diode deviates from one side of first circuit board.
3. The backlight module according to claim 2,
the materials of the first and second conductive portions include: anisotropic conductive adhesive.
4. The backlight module according to claim 1,
the conductive connecting part is made of soldering tin.
5. The backlight module according to claim 1,
the material of the packaging layer comprises silica gel.
6. The backlight module according to claim 1,
the first circuit board is a printed circuit board.
7. The backlight module according to claim 1,
the second circuit board is a flexible circuit board.
8. The backlight module according to claim 1,
the second circuit board only comprises one conductive layer, and the a signal lines are located on the conductive layer.
9. The backlight module according to claim 1,
the backlight module also comprises a frame body, a reflecting sheet, a prism sheet, a lower diffusion sheet and an upper diffusion sheet;
the frame body forms an accommodating space for accommodating the light bar, the light guide plate, the reflecting sheet, the prism sheet, the lower diffusion sheet and the upper diffusion sheet;
the reflector plate, the light guide plate, the lower diffusion sheet, the prism sheet and the upper diffusion sheet are sequentially stacked.
10. A display device, comprising the backlight module according to any one of claims 1-9, and a display panel;
the display panel is arranged on one side of the light emergent surface of the light guide plate.
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| CN201811158191.9A CN109188768B (en) | 2018-09-30 | 2018-09-30 | Backlight module and display device |
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| CN109633807B (en) * | 2019-02-26 | 2021-11-05 | 京东方科技集团股份有限公司 | Backlight module, display module and display device |
| CN112524504A (en) * | 2019-09-01 | 2021-03-19 | 王定锋 | Strip-shaped flexible panel lamp and manufacturing method thereof |
| CN110824766A (en) * | 2019-10-25 | 2020-02-21 | 武汉华星光电技术有限公司 | Backlight structure, manufacturing method thereof and display device |
| CN113568219B (en) * | 2020-04-28 | 2023-03-28 | 华为技术有限公司 | Backlight and display device |
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| JP4654942B2 (en) * | 2006-02-28 | 2011-03-23 | ミネベア株式会社 | Surface lighting device |
| JP4573128B2 (en) * | 2006-03-14 | 2010-11-04 | ミネベア株式会社 | Surface lighting device |
| KR101295358B1 (en) * | 2011-03-16 | 2013-08-12 | 삼성전자주식회사 | Liquid crystal display and led module thereof |
| CN102661496B (en) * | 2012-04-09 | 2015-06-17 | 深圳市华星光电技术有限公司 | LED (light-emitting diode) light source and corresponding backlight module |
| KR102067420B1 (en) * | 2013-08-30 | 2020-01-17 | 엘지디스플레이 주식회사 | Light emitting diode assembly and liquid crystal display device having the same |
| CN107102477B (en) * | 2017-06-13 | 2020-06-19 | 厦门天马微电子有限公司 | LED lamp strip, backlight unit and display device |
| CN108037618A (en) * | 2018-01-02 | 2018-05-15 | 厦门天马微电子有限公司 | A kind of backlight module and liquid crystal display device |
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