CN113625488A - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN113625488A CN113625488A CN202110917393.2A CN202110917393A CN113625488A CN 113625488 A CN113625488 A CN 113625488A CN 202110917393 A CN202110917393 A CN 202110917393A CN 113625488 A CN113625488 A CN 113625488A
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- guide plate
- light guide
- light
- backlight module
- fpc131
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Images
Classifications
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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
-
- 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
-
- 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
- G02F1/133608—Direct backlight including particular frames or supporting means
-
- 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
- G02F1/133612—Electrical details
Abstract
The invention provides a backlight module and a display device. The invention provides a backlight module, which comprises a back plate, a light guide plate and a backlight source assembly, wherein the light guide plate is supported on the back plate; the flexible circuit board comprises a positioning part, a bending part and a connecting part, wherein the edge of the positioning part is lapped on the surface of one side of the light guide plate, which is far away from the back plate, the connecting part is positioned on one side of the back plate, which is far away from the light guide plate, and the bending part is positioned on the side of the light guide plate and between the positioning part and the connecting part; a shading space is arranged between the bending part and the side wall of the light guide plate, the light bar is located in the shading space, and the light emitting surface of the light bar faces the side wall of the light guide plate. The backlight module provided by the invention can not generate a light leakage phenomenon, can improve the luminous efficiency of the backlight module and improve the display effect of the display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
The liquid crystal screen has the advantages of zero radiation, low energy consumption, small heat dissipation, good picture stability and the like, and is widely applied to display devices such as mobile phones, tablet computers, televisions and the like. Because the liquid crystal screen does not emit light, a backlight module needs to be carried to provide light for the liquid crystal screen, and the liquid crystal screen and the backlight module jointly form the display device.
Backlight unit includes backplate, reflector plate, light guide plate and backlight, and reflector plate and light guide plate support in proper order on the backplate, and the backlight includes Flexible Circuit board (Flexible Printed Circuit, for short FPC) and installs the LED lamp strip on FPC, to the side income formula backlight, the laminating of the light emitting area of LED lamp strip is on the lateral wall of light guide plate. At present, when the backlight source is installed, the FPC stretches into the gap between the back plate and the light guide plate, and holes are formed in the bottom end of the back plate, and the FPC penetrates out from the holes in the bottom end of the back plate and is bent and overturned to be attached to the other side surface of the back plate.
However, part of the light emitted from the LED light bar leaks outwards through the opening of the back plate, resulting in light leakage and affecting the light emitting efficiency of the backlight module.
Disclosure of Invention
In order to solve at least one of the problems mentioned in the background art, the present invention provides a backlight module and a display device, wherein the backlight module does not generate a light leakage phenomenon, and can improve the light emitting efficiency of the backlight module and the display effect of the display device.
In order to achieve the above purpose, the invention provides the following technical scheme:
in one aspect, the present invention provides a backlight module for providing light to a display panel of a display device, the backlight module including a back plate, a light guide plate and a backlight assembly, the light guide plate being supported on the back plate, the backlight assembly including a flexible circuit board and a light bar mounted on the flexible circuit board;
the flexible circuit board comprises a positioning part, a bending part and a connecting part, wherein the edge of the positioning part is lapped on the surface of one side of the light guide plate, which is far away from the back plate, the connecting part is positioned on one side of the back plate, which is far away from the light guide plate, and the bending part is positioned on the side of the light guide plate and between the positioning part and the connecting part; a shading space is arranged between the bending part and the side wall of the light guide plate, the light bar is located in the shading space, and the light emitting surface of the light bar faces the side wall of the light guide plate.
As above backlight unit, optionally, the lateral wall of lamp strip is connected in location portion, and the laminating of the light emitting area of lamp strip is on the lateral wall of light guide plate.
As described above, optionally, the backlight module further includes a reflective sheet disposed on a side surface of the back plate facing the light guide plate, and the light guide plate is stacked on the reflective sheet.
As described above, in the backlight module, optionally, the edge of the reflective sheet extends out of the light guide plate, and the two sides of the light bar are clamped between the surface of the reflective sheet and the positioning portion.
As mentioned above, optionally, the backlight module further includes a supporting member, the supporting member is connected to an edge of the back plate, and the supporting member is located in the light shielding space at the side of the light bar.
As mentioned above, optionally, the edge of the back plate has a blocking edge, the blocking edge extends toward the positioning portion, and the supporting member is fixed on the blocking edge.
In the backlight module as described above, optionally, one side of the supporting member facing the flexible circuit board is connected to the positioning portion.
As mentioned above, optionally, the backlight module further includes an optical film, the optical film is stacked on a surface of the light guide plate facing away from the back plate, an edge of the light guide plate extends out of the optical film, and the positioning portion is overlapped on the edge of the light guide plate.
As described above, in the backlight module, the optical film may include a diffusion sheet and at least one prism film stacked.
In another aspect, the present invention provides a display device, which includes a display panel and the backlight module as described above, wherein the display panel is disposed on the light-emitting side of the backlight module.
The invention provides a backlight module and a display device, wherein the display device comprises a display panel and the backlight module, the backlight module is used for providing light rays for the display panel, the backlight module comprises a back plate, a light guide plate and a backlight source component, the light guide plate is supported on one side of the back plate facing the display panel, and the backlight source component comprises a flexible circuit board and a light bar which is arranged on the flexible circuit board and electrically connected with the flexible circuit board; wherein, the flexible circuit board is including the location portion that connects gradually, portion and connecting portion of bending, through with the edge overlap joint of location portion on the light guide plate towards a side surface of display panel, the portion of bending is located the side of light guide plate, the flexible circuit board turns over the back through the portion of bending and forms the connecting portion that is located the back of backplate, the portion of bending of flexible circuit board, be close to the partial location portion and the partial connecting portion of the portion of bending, and enclose into the shading space between the lateral wall of light guide plate, through the position that is located the shading space with lamp strip connection on the flexible circuit board, through the parcel effect of flexible circuit board to the lamp strip, can avoid the outside light leak of lamp strip, improve backlight unit's luminous efficacy, promote display device's display effect.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention. For a person skilled in the art, without inventive effort, further figures can be obtained from these figures.
Fig. 1 is a partial structural view of a display device in the related art;
fig. 2 is a partial structural diagram of a display device according to an embodiment of the present invention;
fig. 3 is a partial structural diagram of another display device according to an embodiment of the present invention.
Description of reference numerals:
100-a display device;
1-a backlight module; 2-a display panel;
11-a back plate; 12-a light guide plate; 13-a backlight assembly; 14-a reflective sheet; 15-a support; 16-an optical membrane;
111-blocking edge; 131-FPC; 132-a light bar; 161-diffusion sheet; 162-a prismatic film;
11 a-flanging; 131 a-a positioning portion; 131 b-a bent part; 131 c-a connecting portion; 132a-LED light bar.
Detailed Description
Display devices such as mobile phones, flat panels and televisions can be carried with liquid crystal screens, the liquid crystal screens do not emit light, and a backlight module is needed to provide light. The backlight module is positioned at the light incident side of the display panel (liquid crystal screen), and light emitted by the backlight module is incident to the display panel to enable the display panel to emit light.
Fig. 1 is a partial structural view of a display device in the related art. As shown in fig. 1, the backlight module 1 includes a backlight, a back plate 11, and a reflective sheet 14 and a light guide plate 12 stacked in sequence on the back plate 11. In the related art, the edge of the back plate 11 is provided with a flange 11a, the flange 11a is folded to the side where the display panel 2 is located, and the display panel 2 is supported on the flange 11 a; the reflective sheet 14 and the light guide plate 12 are sequentially stacked on the rear plate 11, and edges of the reflective sheet 14 and the light guide plate 12 extend into a receiving groove formed between the flange 11a and the plate surface of the rear plate 11.
One side edge of the Flexible Circuit board (Flexible Printed Circuit, abbreviated as FPC) provided with the LED light bar 132a is arranged on the same layer as the reflector 14, the LED light bar 132a is arranged on the surface of the FPC131 facing one side of the light guide plate 12, a through hole is formed in the edge of the back plate 11, the FPC131 penetrates through the through hole and extends out of the back plate 11, and the part of the FPC131 located outside the back plate 11 is folded and attached to the other side surface of the back plate 11 (namely, one side surface of the back plate 11 departing from the display panel 2).
Since the edge of the back plate 11 is provided with the through hole, at least a part of the area of the LED light bar 132a is exposed in the through hole, and some of the light emitted by the LED light bar 132a inevitably leaks out through the through hole, which may reduce the light emitting efficiency of the backlight module 1 and may cause the display panel 2 to generate a bright edge, thereby affecting the display effect of the display device 100.
Moreover, the FPC131 is folded from the surface of one side of the back plate 11 facing the light guide plate 12 to the surface of the other side of the back plate 11, and since the thickness of the back plate 11 is small, a part of the FPC131 penetrating out of the edge of the back plate 11 cannot be provided with a rubber frame for supporting, the strength of the FPC131 at the part is weakened, and the FPC131 is easily damaged in a reliability test; in addition, the portion of the FPC131 on the surface of the back plate 11 facing the light guide plate 12 is usually adhered to the back plate 11 by an adhesive tape (e.g., a double-sided adhesive tape), which increases the cost of the backlight module 1.
In order to solve the technical problems, the invention provides a backlight module and a display device, wherein the edge of an FPC (flexible printed circuit) is lapped on a light guide plate, the FPC is folded from the edge of the light guide plate to the surface of one side of a back plate, which is far away from a display panel, and a light bar is wrapped on the side of the light guide plate through the FPC, so that the light bar is prevented from leaking outwards, the light emitting efficiency of the backlight module is improved, and the display effect of the display device is improved; in addition, the strength and the reliability of the FPC can be improved, and the cost of the backlight module is saved.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
Fig. 2 is a partial structural diagram of a display device according to an embodiment of the present invention. Fig. 3 is a partial structural diagram of another display device according to an embodiment of the present invention. As shown in fig. 2 and fig. 3, the present embodiment provides a display device 100, where the display device 100 may be an electronic device with a display screen, such as a mobile phone, a tablet computer, a notebook computer, an intelligent wearable device, and a television, and the present embodiment is not limited in particular.
The display device 100 includes a display panel 2 and a backlight module 1, and the display panel 2 is stacked on a light emitting side of the backlight module 1. Taking the front surface of the display panel 2 as one side of the display screen, and the other surface of the display panel 2 opposite to the front surface as the back surface, the backlight module 1 may be located on the back surface of the display panel 2. The back surface of the display panel 2 is the light incident side of the display panel 2, and the surface of the backlight module 1 facing the display panel 2 is the light emitting side of the backlight module 1.
In a specific application, the display panel 2 may be a liquid crystal panel, that is, the display device 100 is a display device 100 mounted with a liquid crystal panel. The display panel 2 does not emit light, and light is provided to the display panel 2 through the backlight module 1 located at the light incident side of the display panel, so that the display panel 2 displays pictures.
The structure of the display panel 2 of the display device 100 can refer to a conventional liquid crystal panel structure, and the present embodiment does not specifically limit this. The backlight module 1 of the display device 100 will be described in detail below.
As shown in fig. 2, the backlight module 1 of the display device 100 includes a back plate 11, a light guide plate 12 and a backlight assembly 13, the back plate 11 is used for supporting other structural layers of the backlight module 1 and the display panel 2, the back plate 11 is located at the back of the display panel 2, and the other structural layers of the backlight module 1 are supported on the back plate 11; wherein the light guide plate 12 is located on a side of the back plate 11 facing the display panel 2.
For convenience of description, in the present embodiment, a surface of the back plate 11 facing the display panel 2 is defined as a front surface of the back plate 11, and a surface of the back plate 11 facing away from the display panel 2 is defined as a back surface of the back plate 11. Similarly, for the other structural layers of the backlight module 1, the surface of the structural layer facing the display panel 2 is defined as the front surface thereof, and the surface of the structural layer facing away from the display panel 2 is defined as the back surface thereof.
The backlight assembly 13 includes an FPC131 and a light bar 132 mounted on the FPC131, and the light bar 132 may be electrically connected to an external circuit through the FPC 131. The FPC131 is electrically connected to an external circuit, and the external circuit supplies current to the light bar 132 through the FPC131, so that the light bar 132 emits light. For example, a pad may be disposed on the FPC131, and the light bar 132 is soldered on the FPC131 through the pad; alternatively, the light bar 132 is adhered to the FPC131 by conductive adhesive.
A plurality of lamp beads may be disposed on the lamp strip 132 at intervals, and the lamp beads may be, for example, Light-Emitting diodes (LEDs). In this embodiment, backlight unit 1 is side income formula backlight unit 1, and lamp strip 132 is located the side of light guide plate 12, and each LED lamp pearl on lamp strip 132 can correspond the different positions of light guide plate 12 lateral wall respectively, and the light emitting area of all LED lamp pearls on lamp strip 132 all faces the lateral wall of light guide plate 12, and the light that all LED lamp pearls sent gets into light guide plate 12 by the lateral wall of light guide plate 12.
In practical applications, according to design requirements, at least one side of the display device 100 is provided with the backlight assembly 13, that is, at least one side of the display device 100 is provided with the FPC131 and the light bar 132, and a light emitting surface of the light bar 132 faces a side wall of the corresponding side of the display device 100.
For example, taking the display device 100 as an example having a day side, a left side, a right side and a ground side, the day side is opposite to the ground side, and the left side is opposite to the right side, a set of backlight assemblies 13 may be disposed on the ground side of the display device 100, or a set of backlight assemblies 13 may be disposed on the left side or the right side of the display device 100, or a set of backlight assemblies 13 may be disposed on the left side and the right side of the display device 100, respectively. The backlight unit 13 provided on one side of the display device 100 will be described below as an example.
As shown in fig. 2, the FPC131 is a single piece, the FPC131 includes a positioning portion 131a, a bending portion 131b, and a connecting portion 131c, and the positioning portion 131a, the bending portion 131b, and the connecting portion 131c are connected in sequence. The FPC131 is positioned by the positioning portion 131a, the FPC131 is led out from the side of the backlight module 1 by the bending portion 131b and folded to the back surface of the back plate 11, the connection portion 131c of the FPC131 is located on the back surface of the back plate 11, the FPC131 is electrically connected to an external circuit by the connection portion 131c, and the connection portion 131c of the FPC131 may be electrically connected to a circuit board (main board) provided in a mobile phone, taking the display device 100 as an example.
Specifically, the edge of the positioning portion 131a of the FPC131 overlaps the front surface of the light guide plate 12, for example, the edge of the positioning portion 131a of the FPC131 overlaps one edge of the front surface of the light guide plate 12, and the positioning portion 131a of the FPC131 extends from the edge of the light guide plate 12 to the outside of the one side; the FPC131 positioned at the side of the light guide plate 12 forms a bending part 131b, the bending part 131b is a bending structure, and the FPC131 is folded toward the back of the back plate 11 through the bending part 131 b; the FPC131 is folded to the back surface of the back panel 11, and continues to extend along the back surface of the back panel 11 to form a connection portion 131c, and the connection portion 131c of the FPC131 may be connected and fixed to the back surface of the back panel 11.
The positioning portion 131a of the FPC131 is fixed on the light guide plate 12, and the connection portion 131c of the FPC131 is fixed on the rear surface of the rear panel 11, so that it is fixed by the positioning portion 131a and the connection portion 131c of the FPC131 to define the position of the FPC131, to position the lamp bar 132 mounted on the FPC131, and to facilitate the electrical connection of the FPC131 and an external circuit.
By bonding the positioning portion 131a of the FPC131 to the front surface of the light guide plate 12, the FPC131 is led out from the side of the light guide plate 12, and then folded back to the back surface of the back plate 11 by the folding portion 131b, and the connection portion 131c of the FPC131 is folded back to the back surface of the back plate 11 and connected and fixed to the back plate 11. In this arrangement, a light shielding space is defined between the portion of the positioning portion 131a of the FPC131 located on the side of the light guide plate 12, the portion of the connection portion 131c located on the side of the light guide plate 12, and the bent portion 131b located between the positioning portion 131a and the connection portion 131c and the side wall of the light guide plate 12.
In this embodiment, the light bar 132 is connected to the FPC131 in the area of the light shielding space, that is, the light bar 132 is located in the light shielding space. Because the light emitting surface of the light bar 132 faces the side wall of the light guide plate 12, most of the light emitted by the light bar 132 enters the light guide plate 12 through the side wall of the light guide plate 12, and the light is uniformly emitted from the front surface of the light guide plate 12 through the light guide effect of the light guide plate 12; moreover, even if a small amount of light does not enter the light guide plate 12, the light bar 132 is wrapped in the shading space by the FPC131, the light bar 132 does not leak light outwards, and the phenomenon of poor display is not caused, and at least a part of light is reflected by the FPC131 and then enters the light guide plate 12, so that the light emitting efficiency of the backlight module 1 can be improved, and the display effect of the display device 100 is further improved.
Because the edge of the positioning portion 131a of the FPC131 is overlapped on the light guide plate 12, the light bar 132 can be fixed on the positioning portion 131a of the FPC131, for example, the light bar 132 is located at a position on the positioning portion 131a of the FPC131 close to the side wall of the light guide plate 12, the light bar 132 is closer to the side wall of the light guide plate 12, the propagation distance from the light emitted by the light bar 132 to the side wall of the light guide plate 12 is closer, and the light emitted by the light bar 132 can enter the light guide plate 12.
As a specific embodiment, the side wall of the light bar 132 is fixed on the positioning portion 131a, and the light emitting surface of the light bar 132 is attached to the side wall of the light guide plate 12, and there is no space between the light emitting surface of the light bar 132 and the side wall of the light guide plate 12, so that more and faster light rays emitted by the light bar 132 enter the light guide plate 12 from the side wall of the light guide plate 12, the more light rays enter the light guide plate 12, the brighter the light guide plate 12, the higher the light emitting efficiency of the backlight module 1 is, and the better the display effect of the display device 100 is.
In order to improve the light emitting efficiency of the backlight module 1, as shown in fig. 3, the backlight module 1 further includes a reflective sheet 14, the reflective sheet 14 is disposed on the front surface of the back plate 11, and exemplarily, the reflective sheet 14 may be adhered on the front surface of the back plate 11. The light guide plate 12 is stacked on the reflection sheet 14, and the light irradiated to the back plate 11 is reflected back into the light guide plate 12 by the reflection sheet 14 and emitted from the front surface of the light guide plate 12 together with the light guided by the light guide plate 12, so that the brightness and the light emitting efficiency of the backlight module 1 can be improved.
Specifically, the light directly emitted from the light bars 132 to the back plate 11, or the light emitted from the light guide plate 12 to the back plate 11, is irradiated to the reflective sheet 14, and the reflective sheet 14 reflects the light back into the light guide plate 12 and emits the light from the front surface of the light guide plate 12. Thus, the light source loss can be reduced, and the brightness and energy efficiency of the backlight module 1 can be improved.
In addition, in the embodiment, the edge of the reflective sheet 14 may extend out of the light guide plate 12, so that the light emitted from the light emitting surface of the light bar 132 to the back plate 11 and the light emitted from the light guide plate 12 to the back plate 11 can both irradiate the reflective sheet 14 and be reflected back into the light guide plate 12 by the reflective sheet 14, thereby ensuring the reflective effect of the reflective sheet 14.
Moreover, the reflective sheet 14 extends out of the edge of the light guide plate 12, and can limit the position of the light bar 132. For example, the gap between the positioning portion 131a of the FPC131 and the reflective sheet 14 matches the width of the light bar 132, the side wall of one side of the light bar 132 is fixed to the positioning portion 131a of the FPC131, the side wall of the other side of the light bar 132 is attached to the reflective sheet 14, and the two sides of the light bar 132 are clamped between the positioning portion 131a of the FPC131 and the surface of the reflective sheet 14, so that the light bar 132 can be limited.
Since the side wall of the light guide plate 12 is located between the positioning portion 131a of the FPC131 and the reflective sheet 14, and the two sides of the light bar 132 are also clamped between the positioning portion 131a of the FPC131 and the reflective sheet 14, the light emitting surface of the light bar 132 can be ensured to be aligned with the side wall of the light guide plate 12, so that light emitted from the light emitting surface of the light bar 132 enters the light guide plate 12 as much as possible. In addition, the FPC131 wraps the light-shielding space formed by the side wall of the light guide plate 12, so that light leakage of the light bar 132 to the outside can be avoided, and thus, the brightness and the efficacy of the backlight module 1 can be effectively improved.
It should be noted that, for the case that the FPC131 wraps the side wall of the light guide plate 12, in some other embodiments, the edge of the positioning portion 131a of the FPC131 may also be lapped in a structural layer above the light guide plate 12. As shown in fig. 3, exemplarily, the positioning portion 131a of the FPC131 is overlapped on a certain structural layer in the display panel 2, taking the display panel 2 as a liquid crystal panel as an example, the positioning portion 131a of the FPC131 may be overlapped on an array substrate (TFT substrate) or a color filter substrate (CF substrate) of the display panel 2, and the connecting portion 131c of the FPC131 is still folded to the back surface of the backplane 11. Therefore, the structure that the FPC131 wraps the side wall of the light guide plate 12 can be formed, and the light bar 132 can be arranged in the region, located in the shading space, on the FPC 131.
For the case that the positioning portion 131a of the FPC131 is overlapped in the structural layer above the light guide plate 12, for example, the edge of the structural layer above the light guide plate 12 does not exceed the edge of the light guide plate 12, so that the light emitting surface of the light bar 132 is attached to the sidewall of the light guide plate 12. Moreover, the light bar 132 is designed according to the distance between the positioning portion 131a of the FPC131 and the light guide plate 12, so that the light emitting surface of the light bar 132 is ensured to face the side wall of the light guide plate 12; or, the light bar 132 is connected to the positioning portion 131a of the FPC131 through a conductive structure, and the conductive structure occupies a certain thickness space, so that the light emitting surface of the light bar 132 faces the side wall of the light guide plate 12.
As shown in fig. 2, since the connection portion 131c of the FPC131 is folded to the back surface of the back panel 11, the bending portion 131b of the FPC131 is located at the side of the light guide plate 12, and a gap is formed between the bending portion 131b of the FPC131 and the side wall of the light guide plate 12, the bending portion 131b of the FPC131 has no supporting function of the light guide plate 12 or the back panel 11, the strength of the bending portion 131b is low, and the bending portion 131b has a bending structure, and the pulling action is strong, so that the strength of the bending portion 131b of the FPC131 needs to be enhanced.
As one embodiment, as shown in fig. 3, a support member 15 is provided in a light shielding space formed between the FPC131 and the side wall of the light guide plate 12, the edge of the rear plate 11 is protruded out of the reflective sheet 14 and the light guide plate 12, and the support member 15 is fixed to the edge of the rear plate 11. The bending portion 131b of the FPC131 bypasses the supporting member 15 to fold back to the back of the back panel 11, and the supporting function of the supporting member 15 on the bending portion 131b of the FPC131 can increase the strength of the bending portion 131b of the FPC131, thereby preventing the bending portion 131b of the FPC131 from cracking or tearing the FPC131 at the bending portion 131b in the reliability test.
For example, the supporting member 15 may be a plastic member with elasticity to reduce scratching of the surface of the FPC131 by the supporting member 15 and protect the FPC131 from being damaged.
It should be understood that, since the positioning portion 131a of the FPC131 is overlapped on the front surface of the light guide plate 12, the connection portion 131c of the FPC131 is folded to the back surface of the back panel 11, the light guide plate 12 and the back panel 11 are both located in the space between the positioning portion 131a and the connection portion 131c of the FPC131, a sufficient thickness space is provided between the positioning portion 131a and the connection portion 131c of the FPC131, and the support member 15 is sufficiently provided in the light shielding space enclosed by the side walls of the FPC131 and the light guide plate 12, so that the strength of the bending portion 131b of the FPC131 can be enhanced by the support member 15.
For the fixing of the supporting member 15 on the back plate 11, specifically, as shown in fig. 3, the edge of the back plate 11 has a blocking edge 111, the blocking edge 111 protrudes toward the positioning portion 131a by bending the edge of the back plate 11 toward the positioning portion 131a, and for example, the blocking edge 111 may be perpendicular to the plate surface of the back plate 11, and the supporting member 15 is supported and fixed on the blocking edge 111. The bottom of the supporting member 15 abuts against the front surface of the back plate 11, and the side wall of the supporting member 15 abuts against the blocking edge 111 of the back plate 11, so as to fix the supporting member 15 firmly.
For example, the supporting member 15 may be adhered to the back plate 11 by a dispensing process.
In addition, as shown in fig. 3, in order to enhance the stability of the FPC131, a portion of the positioning portion 131a of the FPC131 corresponding to the support member 15 may be connected and fixed to the support member 15, that is, a surface of the support member 15 facing the positioning portion 131a of the FPC131 is connected to the positioning portion 131a of the FPC131, after the edge of the positioning portion 131a of the FPC131 is fixed to the edge of the light guide plate 12.
Different positions on the positioning portion 131a of the FPC131 are respectively connected and fixed with the light guide plate 12 and the support 15, so that the positioning portion 131a of the FPC131 is firmly fixed, the smoothness of the positioning portion 131a of the FPC131 is ensured, and the positioning portion 131a of the FPC131 is prevented from being tilted, so that the positioning accuracy of the positioning portion 131a of the FPC131 on the light bar 132 can be improved.
In practical applications, the connection between the edge of the positioning portion 131a of the FPC131 and the light guide plate 12 and the connection between the positioning portion 131a of the FPC131 and the support 15 may be bonded by a dispensing process; alternatively, adhesive tapes may be provided between the edge of the positioning portion 131a of the FPC131 and the surface of the light guide plate 12 and between the positioning portion 131a of the FPC131 and the support 15. In addition, the connection portion 131c of the FPC131 may be adhered to the back surface of the back panel 11, for example, the connection portion 131c of the FPC131 is adhered to the back panel 11 by a foam tape.
In addition, in order to prevent the light bar 132 from warping or pulling apart in the reliability test, an edge-covering tape (not shown in the figure) may be further used to fix the side of the display device 100 where the backlight module 13 is disposed, where the edge-covering tape covers the outer surface of the FPC131, for example, one end of the edge-covering tape extends to wrap the portion of the FPC131 located on the back surface of the back plate 11, the other end of the edge-covering tape extends to wrap the portion of the FPC131 located on the light guide plate 12 or the display panel 2, and the edge-covering tape may tightly wrap the entire FPC 131.
For example, the taping tape may wrap the inner structural layers of the sides of the display device 100 to improve the integrity of the structural layers of the display device 100. For example, both sides of the taping tape located at the side of the display device 100 are respectively adhered to the rear panel 11 and a certain structural layer (e.g., a TFT substrate or a CF substrate) of the display panel 2. In addition, taking a mobile phone as an example, an antenna in the mobile phone is usually arranged on the side edge of the mobile phone, and an anti-interference effect can be achieved by arranging the edge-covering adhesive tape, so that the antenna is prevented from radiating electromagnetic waves outwards.
As shown in fig. 2, in the case where the structural layer of the display panel 2 is pressed on the surface of the positioning portion 131a of the FPC131 facing the display panel 2, the positioning portion 131a of the FPC131 is interposed between the display panel 2 and the light guide plate 12, and the positioning portion 131a of the FPC131 can be firmly fixed by the pressing force of the display panel 2 and the light guide plate 12. Thus, the edge of the positioning portion 131a of the FPC131 may be merely lapped on the light guide plate 12 without being connected to the light guide plate 12.
If the scheme that the edge of the positioning portion 131a of the FPC131 is overlapped on the light guide plate 12 (the positioning portion 131a of the FPC131 is not connected to the light guide plate 12) is adopted, or the positioning portion 131a of the FPC131 is glued on the light guide plate 12, compared with the related technical scheme, the embodiment does not need to arrange a tape on the front surface of the back plate 11 to fix the FPC131, and therefore, the cost can be saved.
As shown in fig. 2, the backlight module 1 further includes an optical film 16 laminated on the front surface of the light guide plate 12. When the backlight module 1 works, light emitted by the light bar 132 is emitted into the light guide plate 12 from the side wall of the light guide plate 12, and the light entering from the side is emitted from the front surface of the light guide plate 12 through the light guiding function of the light guide plate 12, so that the brightness of the display panel 2 is improved; then, the light passes through the optical film 16, and the front brightness and the light effect of the display panel 2 can be further enhanced by the action of the optical film 16.
It should be noted that the edge of the light guide plate 12 may extend out of the optical film 16 to expose the edge area of the front surface of the light guide plate 12, so as to facilitate the overlapping of the edge of the positioning portion 131a of the FPC131 on the edge portion of the front surface of the light guide plate 12.
In addition, the optical film 16 may include a multi-layer structure, for example, the optical film 16 includes a diffusion sheet 161 and a prism film 162 that are sequentially stacked on the light guide plate 12. The diffusion sheet 161 is used for dispersing the light emitted from the front surface of the light guide plate 12, so that the light is uniformly emitted to the display panel 2, thereby improving the brightness uniformity of the display panel 2; the prism film 162 may condense light emitted from the diffusion sheet 161 and diverged to various angles onto an axial angle (a front view angle of the display panel 2) to improve axial luminance of the display panel 2.
For example, two prism films 162 may be stacked on the diffusion sheet 161, and the extending directions of the prisms on the two prism films 162 may be different in the plane direction of the display panel 2, for example, the extending directions of the prisms on the two prism films 162 are perpendicular to each other, so as to converge light from different directions, thereby improving the light converging effect of the prism films 162 and enhancing the axial brightness of the display panel 2.
The display device provided by the embodiment comprises a display panel and a backlight module positioned on the light incident side of the display panel, wherein the backlight module is used for providing light rays for the display panel and comprises a back plate, a light guide plate and a backlight source assembly, the light guide plate is supported on one side of the back plate facing the display panel, and the backlight source assembly comprises a flexible circuit board and a light bar which is installed on and electrically connected with the flexible circuit board; wherein, the flexible circuit board is including the location portion that connects gradually, portion and connecting portion of bending, through with the edge overlap joint of location portion on the light guide plate towards a side surface of display panel, the portion of bending is located the side of light guide plate, the flexible circuit board turns over the back through the portion of bending and forms the connecting portion that is located the back of backplate, the portion of bending of flexible circuit board, be close to the partial location portion and the partial connecting portion of the portion of bending, and enclose into the shading space between the lateral wall of light guide plate, through the position that is located the shading space with lamp strip connection on the flexible circuit board, through the parcel effect of flexible circuit board to the lamp strip, can avoid the outside light leak of lamp strip, improve backlight unit's luminous efficacy, promote display device's display effect.
It is to be understood that the terms upper, lower, top, bottom, top end, bottom end, top end surface, bottom end surface, and the like referring to the present embodiment indicate the orientation based on the positional relationship of the installation and use state of the apparatus or equipment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A backlight module is used for providing light rays for a display panel of a display device and is characterized by comprising a back plate, a light guide plate and a backlight source assembly, wherein the light guide plate is supported on the back plate;
the flexible circuit board comprises a positioning part, a bending part and a connecting part, wherein the edge of the positioning part is lapped on the surface of one side of the light guide plate, which is far away from the back plate, the connecting part is positioned on one side of the back plate, which is far away from the light guide plate, and the bending part is positioned on the side of the light guide plate and between the positioning part and the connecting part; the light guide plate is characterized in that a shading space is arranged between the bending part and the side wall of the light guide plate, the light bar is located in the shading space, and the light emitting surface of the light bar faces the side wall of the light guide plate.
2. The backlight module of claim 1, wherein the side wall of the light bar is connected to the positioning portion, and the light emitting surface of the light bar is attached to the side wall of the light guide plate.
3. The backlight module according to claim 2, further comprising a reflective sheet disposed on a side surface of the back plate facing the light guide plate, the light guide plate being laminated on the reflective sheet.
4. The backlight module of claim 3, wherein the edge of the reflector plate extends out of the light guide plate, and two sides of the light bar are clamped between the surface of the reflector plate and the positioning portion.
5. The backlight module according to any one of claims 1-4, further comprising a support member connected to an edge of the back plate, wherein the support member is located in the light-shielding space beside the light bar.
6. The backlight module according to claim 5, wherein the edge of the back plate has a blocking edge, the blocking edge extends toward the positioning portion, and the supporting member is fixed on the blocking edge.
7. The backlight module according to claim 5 or 6, wherein a side of the supporting member facing the flexible circuit board is connected to the positioning portion.
8. The backlight module according to any one of claims 1-7, further comprising an optical film, wherein the optical film is stacked on a surface of the light guide plate facing away from the back plate, an edge of the light guide plate extends out of the optical film, and the positioning portion overlaps the edge of the light guide plate.
9. A backlight module as recited in claim 8, wherein the optical film comprises a laminated diffuser and at least one layer of prismatic film.
10. A display device, comprising a display panel and the backlight module of any one of claims 1-9, wherein the display panel is disposed on the light-emitting side of the backlight module.
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| CN202110917393.2A CN113625488A (en) | 2021-08-11 | 2021-08-11 | Backlight module and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110917393.2A CN113625488A (en) | 2021-08-11 | 2021-08-11 | Backlight module and display device |
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| CN113625488A true CN113625488A (en) | 2021-11-09 |
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| CN202110917393.2A Pending CN113625488A (en) | 2021-08-11 | 2021-08-11 | Backlight module and display device |
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