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CN110058455B - Backlight module and display device - Google Patents

Backlight module and display device Download PDF

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Publication number
CN110058455B
CN110058455B CN201910355678.4A CN201910355678A CN110058455B CN 110058455 B CN110058455 B CN 110058455B CN 201910355678 A CN201910355678 A CN 201910355678A CN 110058455 B CN110058455 B CN 110058455B
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CN
China
Prior art keywords
light
backlight module
opening
light shielding
circuit board
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Application number
CN201910355678.4A
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Chinese (zh)
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CN110058455A (en
Inventor
王雅涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xiamen Tianma Microelectronics Co Ltd
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Xiamen Tianma Microelectronics Co Ltd
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Priority to CN201910355678.4A priority Critical patent/CN110058455B/en
Publication of CN110058455A publication Critical patent/CN110058455A/en
Application granted granted Critical
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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
    • G02F1/133608—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

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The invention discloses a backlight module and a display device, and relates to the technical field of display. In the embodiment of the invention, the light shielding part is arranged in the middle area of the flexible circuit board, and the light shielding part and the light-emitting element are positioned at the same side of the flexible circuit board, so that the opening is arranged at the side edge, and when the flexible circuit board is arranged close to the bottom surface of the frame body, the light shielding part can prevent light emitted by the light-emitting element from leaking out of the opening, thereby solving the problem of light leakage of the backlight module caused when the flexible circuit board is arranged close to the bottom surface of the frame body, and improving the quality of products.

Description

Backlight module and display device
Technical Field
The present invention relates to the field of display technologies, and particularly to a backlight module and a display device.
Background
The lcd generally includes a backlight module, and the backlight source provided by the backlight module can realize the display function. The backlight assembly may include: the backlight module comprises a flexible circuit board 30, a light emitting element 10 fixed on the flexible circuit board 30, a light guide plate 40 located at the light emitting side of the light emitting element 10, and a frame 20, wherein the frame 20 comprises a bottom surface 22 and a side edge 21, the flexible circuit board 30 is arranged far away from the bottom surface 22 (as shown in the "positive group" structure of the backlight module shown in fig. 1), but due to the requirement of the industry for a narrow frame, a structure in which the flexible circuit board 30 is arranged close to the bottom surface 22 (as shown in the "negative group" structure of the backlight module shown in fig. 2) appears.
When the flexible wiring board 30 is disposed away from the bottom surface 22, the side edge 21 does not need to be provided with the opening 23, and the flexible wiring board 30 can be extended to the outside of the frame body 20, as shown in fig. 1. When the flexible printed circuit 30 is disposed near the bottom surface 22, an opening 23 needs to be disposed on the side 21 so that the flexible printed circuit 30 can extend to the outside of the frame 20, as shown in fig. 2.
However, for the structure of the backlight module shown in fig. 2, since the opening 23 is disposed at the side 21, when the light emitting element 10 emits light, light leakage occurs at the opening 23, so that the liquid crystal display also has a light leakage phenomenon at the position, which causes a decrease in product quality and a decrease in customer experience.
Therefore, when the flexible circuit board is disposed close to the bottom surface, how to avoid the light leakage problem occurring at the opening of the side edge of the frame body is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a backlight module and a display device, which are used for avoiding the light leakage problem at an opening at the side edge of a frame body and improving the product quality when a flexible circuit board is arranged close to the bottom surface.
In a first aspect, an embodiment of the present invention provides a backlight module, including:
at least one light emitting element;
the frame body comprises a bottom surface and a side edge connected with the bottom surface, and the side edge close to the light-emitting element is provided with an opening penetrating through the side edge;
the flexible circuit board is arranged close to the bottom surface of the frame body, the flexible circuit board comprises a first area, a second area and a middle area, the first area is located inside the frame body, the light-emitting element is fixed in the first area of the flexible circuit board and is away from one side surface of the bottom surface, the second area is located outside the frame body, and the middle area penetrates through the opening to be connected with the first area and the second area;
the light shielding part is arranged in the middle area of the flexible circuit board in a protruding mode, the light shielding part and the middle area of the flexible circuit board are of an integrated structure, the light shielding part and the light emitting element are located on the same side of the flexible circuit board, and the light shielding part is used for preventing light emitted by the light emitting element from leaking out of the opening.
In a second aspect, an embodiment of the present invention provides a display device, including: the backlight module provided by the embodiment of the invention.
The invention has the following beneficial effects:
according to the backlight module and the display device provided by the embodiment of the invention, the light shielding part is arranged in the middle area of the flexible circuit board, and the light shielding part and the light-emitting element are positioned at the same side of the flexible circuit board, so that the opening is formed in the side edge, and when the flexible circuit board is arranged close to the bottom surface of the frame body, the light emitted by the light-emitting element can be prevented from leaking from the opening by the light shielding part, thereby solving the problem of light leakage of the backlight module caused when the flexible circuit board is arranged close to the bottom surface of the frame body, and improving the quality of products.
Drawings
Fig. 1 is a schematic structural diagram of a backlight module in the prior art when a flexible circuit board is disposed away from a bottom surface of a frame;
fig. 2 is a schematic structural diagram of a backlight module in the prior art when a flexible printed circuit board is disposed near the bottom surface of a frame;
fig. 3 is a schematic structural diagram of a backlight module according to an embodiment of the invention;
FIG. 4 is a schematic structural diagram of another backlight module provided in the embodiment of the present invention;
FIG. 5 is a sectional view taken along the direction indicated by a1-a 1' in FIG. 3;
FIG. 6 is a sectional view taken along the direction indicated by a2-a 2' in FIG. 4;
FIG. 7 is a schematic view in the direction indicated by the bold arrow in FIG. 3;
FIG. 8 is another schematic view taken along the direction indicated by the bold arrow in FIG. 3;
fig. 9 is a schematic view illustrating an opening disposed on a side of a side edge away from a bottom surface according to an embodiment of the invention;
FIG. 10 is a schematic view of another opening disposed on a side of the side edge away from the bottom surface according to the embodiment of the invention;
FIG. 11 is a schematic view of a backlight module based on the structure shown in FIG. 3;
fig. 12 is a schematic structural diagram of a liquid crystal display panel provided in an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of another display device provided in the embodiment of the present invention.
The backlight module comprises a light emitting element 10, a frame 20, a frame 21, a side edge 22, a bottom surface 23, an opening 30, a flexible circuit board 30, a first area 30a, a second area 30b, a middle area 30c, a shading part 31, a light guide plate 40, a reflecting sheet 50, a diffusion sheet 60, a prism sheet 70, a liquid crystal display panel 100, an array substrate 110, an opposite substrate 120, a liquid crystal 130 and a backlight module w.
Detailed Description
The following description will be made in detail with reference to the accompanying drawings for describing a specific embodiment of a backlight module and a display device according to an embodiment of the present invention. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the invention provides a backlight module, as shown in fig. 3 and 4, where fig. 3 is a schematic structural diagram of a backlight module, and fig. 4 is a schematic structural diagram of another backlight module.
Referring to fig. 3 and 4, the backlight assembly may include:
at least one light emitting element 10;
a frame 20 including a bottom surface 22 and a side 21 connected to the bottom surface 22, the side 21 adjacent to the light emitting element 10 having an opening 23 penetrating the side 21;
the flexible printed circuit 30 is arranged close to the bottom surface 22 of the frame body 20, the flexible printed circuit 30 comprises a first area 30a, a second area 30b and a middle area 30c, the first area 30a is positioned inside the frame body 20, the light-emitting element 10 is fixed in the first area 30a of the flexible printed circuit 30 and is away from one side surface of the bottom surface 22, the second area 30b is positioned outside the frame body 20, and the middle area 30c penetrates through the opening 23 to connect the first area 30a and the second area 30 b;
and a light shielding portion 31 protruding from the middle region 30c of the flexible printed circuit 30, wherein the light shielding portion 31 and the middle region 30c of the flexible printed circuit 30 are integrally formed, the light shielding portion 31 and the light emitting device 10 are located on the same side of the flexible printed circuit 30, and the light shielding portion 31 is used for preventing light emitted by the light emitting device 10 from leaking from the opening 23.
In this way, by disposing the light shielding portion 31 in the middle area 30c of the flexible printed circuit 30, and the light shielding portion 31 and the light emitting element 10 are located on the same side of the flexible printed circuit 30, when the opening 23 is disposed on the side 21, and the flexible printed circuit 30 is disposed near the bottom surface 22 of the frame 20, the light shielding portion 31 can prevent the light emitted by the light emitting element 10 from leaking out of the opening 23, thereby solving the problem of light leakage of the backlight module caused when the flexible printed circuit 30 is disposed near the bottom surface 22 of the frame 20, and improving the quality of the product.
In addition, in the embodiment of the present invention, since the light shielding portion 31 and the middle region 30c of the flexible printed circuit 30 are integrated, the flexible printed circuit 30 can be manufactured at the same time, which not only simplifies the manufacturing process of the backlight module, reduces the manufacturing difficulty, but also does not need to increase the manufacturing cost, and meanwhile, facilitates the assembly of the backlight module.
Optionally, in the embodiment of the present invention, when the flexible printed circuit 30 and the light shielding portion 31 are manufactured, a polyimide material may be used, so that not only the requirement of the flexible printed circuit 30 for flexibility but also the light shielding requirement of the light shielding portion 31 can be met. Of course, the material used for manufacturing the flexible wiring board 30 and the light shielding portion 31 is not limited to polyimide, and other materials having flexibility and light shielding performance known to those skilled in the art may be used, and is not limited thereto.
Alternatively, in the embodiment of the present invention, the orthographic projection shape of the light shielding portion 31 on the light exit surface of the backlight module may be a rectangle (as shown in fig. 7 and 8), a trapezoid, or other polygons, as long as the light emitted by the light emitting element 10 can be prevented from leaking out of the opening 23, and the shape of the light shielding portion 31 is not limited.
In practical applications, when the opening 23 is formed on the side 21 of the frame 20, the following methods are used:
the first method comprises the following steps: as shown in fig. 3 to 6, wherein fig. 5 is a sectional view taken along a direction a1-a1 'in fig. 3, and fig. 6 is a sectional view taken along a direction a2-a 2' in fig. 4; the opening 23 is located in the middle region of the side 21 of the frame 20, and in this case, when the light shielding portion 31 is provided, there are two types:
mode 1, as shown in fig. 3, the orthographic projections of the light shielding portion 31 and the opening 23 on the light exit surface of the backlight module overlap, that is, the light shielding portion 31 is located at the opening 23, so that the light shielding portion 31 can shield the opening 23 to prevent light leakage at the opening 23.
Optionally, in the embodiment of the present invention, an orthographic projection of the light shielding portion 31 on the light exit surface of the backlight module falls into an orthographic projection of the opening 23 on the light exit surface of the backlight module, as shown in fig. 7 and 8, the two diagrams are two schematic diagrams along a direction indicated by a bold arrow in fig. 3, and only the middle area 30c of the flexible circuit board 30 is shown in the diagrams, that is, the light shielding portion 31 is located right at the opening 23, and can effectively shield light leakage at the opening 23, so that a better light shielding effect is formed on light leakage at the opening 23, a light leakage phenomenon is greatly improved, and product quality is improved.
In order to explain the relationship between the light shielding portion 31 and the flexible wiring board 30, in fig. 7 and 8, the light shielding portion 31 is indicated by a diagonally filled region and the flexible wiring board 30 is indicated by a sparse black dot filled region, but the use of different filling patterns does not indicate that the light shielding portion 31 and the flexible wiring board 30 are made of different materials.
Further, in the embodiment of the present invention, the central region 30c of the flexible printed circuit board and the orthographic projection of the opening 23 on the light emitting surface of the backlight module have an overlapping region (a region shown by a dashed box g in fig. 7 and 8);
the orthographic projection of the light shielding part 31 on the light-emitting surface of the backlight module falls into the overlapping area g.
That is to say, as shown in fig. 7 and 8, since the orthographic projection of the light shielding portion 31 on the light emitting surface of the backlight module falls into the overlapping region g, the orthographic projection shape of the light shielding portion 31 on the light emitting surface of the backlight module is not changed regardless of the existence of the light shielding portion 31, and thus by providing the light shielding portion 31, not only the light leakage phenomenon at the opening 23 can be effectively improved, but also the structural arrangement of the flexible circuit board 30 and the passing of the flexible circuit board 30 through the opening 23 can be prevented from being affected, and further the bending assembly of the flexible circuit board 30 can be prevented from being affected.
As for the light shielding portion 31, the overlapping area g surrounds the orthographic projection of the light shielding portion 31 on the light exit surface of the backlight module, as shown in fig. 8, so that the light leakage at the opening 23 can be shielded by the light shielding portion 31, and the product quality is improved.
Or, the orthographic projection of the light shielding portion 31 on the light-emitting surface of the backlight module can be completely overlapped with the overlapping area g, that is, the orthographic projection outline of the light shielding portion 31 on the light-emitting surface of the backlight module is the outline of the overlapping area g, as shown in fig. 7, so that light leakage at the opening 23 can be fully and effectively shielded by the light shielding portion 31, the light leakage problem is effectively solved, and the product quality is greatly improved.
Of course, regardless of the size relationship between the orthographic projection of the light shielding portion 31 on the light-emitting surface of the backlight module and the overlapping area g, as long as the orthographic projection of the light shielding portion 31 on the light-emitting surface of the backlight module falls into the overlapping area g, the light leakage at the opening 23 is shielded by the light shielding portion 31, which is within the protection scope of the embodiment of the present invention.
At this time, when the light shielding portion 31 is provided, in the embodiment of the present invention, as shown in fig. 5, the distance (denoted by h 0) between the side of the light shielding portion 31 away from the flexible wiring board 30 and the side of the opening 23 away from the bottom surface 22 in the direction perpendicular to the bottom surface (the Y direction shown in the drawing) is 0 to 0.15 mm.
Of course, the value of h0 is not limited to the above range, and may be other ranges according to actual needs, and is not limited herein.
Thus, the middle area 30c of the flexible circuit board 30 can be ensured to smoothly pass through the opening 23, and the opening 23 can be effectively shielded by the light shielding part 31, so that the light leakage problem is avoided, and the product quality is improved.
In the mode 2, as shown in fig. 4, the light shielding portion 31 and the opening 23 do not overlap or are connected in the orthographic projection of the light-emitting surface of the backlight module, that is, the light shielding portion 31 is located between the side 21 and the light-emitting element 10, wherein the light shielding portion 31 may be disposed close to the side 21 (as shown in fig. 4), or there may be a certain distance (not shown) between the light shielding portion 31 and the side 21, but the distance should not be set to be larger so as to avoid affecting the light leakage shielding effect at the opening. In other words, the light shielding portions 31 are located entirely inside the frame body 20, not in the openings 23 of the side edges 21.
Also, as shown in fig. 6, in the direction along the perpendicular to the bottom surface (Y direction as shown in fig. 6), the sum of the lengths of the light shielding portion 31 and the middle region 30c of the flexible wiring board 30 is set to be greater than or equal to the length of the opening 23; the length of the light shielding portion 31 is set to be greater than or equal to the length of the opening 23 in a direction (X direction as shown in fig. 6) parallel to the bottom surface and parallel to the side 21 where the opening 23 is located.
For example, referring to fig. 6, in the direction along the Y direction, the length of the light shielding portion 31 may be regarded as the thickness or height of the light shielding portion 31, denoted by h1, and the length of the region of the middle region 30c of the flexible wiring board 30 other than the light shielding portion 31 may be regarded as the thickness of the flexible wiring board 30, denoted by h3, and the length of the opening 23 may be regarded as the height of the opening 23, denoted by h4, so that h1+ h3> h 4.
For example, referring to fig. 6, in the direction along the X direction, the length of the light shielding portion 31 is represented by h5, and the length of the opening 23 is represented by h6, then h5> h 6.
In this way, the size of the light shielding portion 31 is larger than that of the opening 23, and the light shielding portion 31 is located inside the frame 20, so that the opening 23 can be completely blocked by the light shielding portion 31, light emitted by the light emitting element 10 cannot leak from the opening 23, and the problem of light leakage from the opening 23 is effectively solved.
In addition, the light shielding portion 31 is not required to be placed in the opening 23, so that the difficulty of assembling the backlight module can be reduced, and the difficulty of manufacturing the display device can be reduced.
Although the light shielding portion 31 and the opening 23 do not overlap or connect with each other in the orthographic projection of the light exit surface of the backlight module, the light shielding portion 31 is still located in the middle area 30c, and optionally, in the embodiment of the present invention, when the middle area 30c of the flexible printed circuit 30 and the orthographic projection of the opening 23 on the light exit surface of the backlight module have an overlapping area, the length of the flexible printed circuit 30 in the overlapping area is equal to the length of the flexible printed circuit 30 in the first area 30a along the direction perpendicular to the bottom surface 22, as shown in fig. 4.
That is, the thickness of the flexible wiring board 30 in the overlapping region is the same as the thickness of the flexible wiring board 30 in the first region 30a, and the thickness of the flexible wiring board 30 in the overlapping region, the thickness of the first region 30a, and the thickness of the second region 30b are all considered to be the same, except that the thickness is increased in the region where the light shielding portion 31 is located, and the light shielding portion 31 is formed.
Therefore, in the embodiment of the present invention, the structure of the flexible circuit board 30 is not greatly affected, and only the thickness of the local area is increased to form the light shielding portion 31, so as to shield the light leakage at the opening 23, so that the light leakage problem can be improved, the manufacturing process of the backlight module can be greatly simplified, the manufacturing difficulty can be reduced, the extra manufacturing cost does not need to be increased, and the present invention has a high application value.
And the second method comprises the following steps: as shown in fig. 9 and 10, fig. 9 is a schematic view of an opening disposed on a side of a side edge away from a bottom surface, fig. 10 is a schematic view of another opening disposed on a side of a side edge away from a bottom surface, and the opening 23 is located on an edge of the side edge 21 of the frame 20 and the side edge away from the bottom surface; at this time, when the light shielding portion 31 is disposed, the disposition of the light shielding portion 31 described in the foregoing manner 1 needs to be selected, as shown in fig. 7 and fig. 8, so as to effectively shield the light leakage at the opening 23, and effectively solve the problem of light leakage at the opening 23, which can be specifically referred to the above description, and the repeated points are repeated.
In this arrangement of the opening 23, the length of the light shielding portion 31 is longer than the length of the light emitting element 10 in the direction perpendicular to the bottom surface. That is, as shown in fig. 9, the height h1 of the light shielding portion 31 is larger than the height h2 of the light emitting element 10 in the Y direction.
Thus, it is possible to avoid that the light leakage at the opening 23 cannot be effectively blocked because the height of the light shielding portion 31 is smaller than the height of the light emitting element 10, thereby effectively improving the blocking effect and effectively solving the light leakage problem.
Alternatively, in the embodiment of the present invention, the difference in length between the light shielding portion 31 and the light emitting element 10 in the direction perpendicular to the bottom surface may be set to be greater than or equal to 0.1 mm. In this way, the light leakage at the opening 23 can be effectively blocked, and the blocking effect of the light blocking portion 31 can be improved.
Of course, the length difference between the light shielding portion 31 and the light emitting element 10 may be determined in accordance with actual circumstances, and is not limited herein.
Alternatively, in the embodiment of the present invention, the sum of the lengths of the light shielding portion 31 and the middle region 30c of the flexible wiring board 30 in the direction perpendicular to the bottom surface is less than or equal to the length of the opening 23. That is, the sum of the heights of the light shielding portion 31 and the middle region 30c of the flexible wiring board 30 is less than or equal to the height of the opening 23.
For example, as shown in fig. 9, the height of the light shielding portion 31 is represented by h1, the height of the region of the middle region 30c of the flexible wiring board 30 other than the light shielding portion 31 is represented by h3, the height of the opening 23 is represented by h4, and h1+ h3 is h 4.
For another example, referring to fig. 10, the height of the light shielding portion 31 is represented by h1, the height of the region of the middle region 30c of the flexible wiring board 30 other than the light shielding portion 31 is represented by h3, the height of the opening 23 is represented by h4, and h1+ h3< h 4.
Thus, the light leakage at the opening 23 can be effectively shielded by the light shielding part 31, the problem of light leakage at the opening 23 is effectively solved, and the shielding effect of the light shielding part 31 is improved. Moreover, the influence on other structures around the frame 20 can be avoided, and the assembly of the backlight module is facilitated.
In order to ensure the normal operation of the backlight module and provide a high-quality backlight source for the liquid crystal display panel, in the embodiment of the present invention, the backlight module includes, in addition to the light emitting device 10, the flexible circuit board 30, and the frame 20 mentioned above: fig. 11 is a schematic structural view of a backlight module based on the structure shown in fig. 3, wherein the reflective sheet 50 and the diffusion sheet 60 are located at opposite sides of the light guide plate 40, and the reflective sheet 50 is used for reflecting light emitted from the bottom of the light guide plate 40, as shown by an arrow in fig. 11, and plays a role in preventing light loss. The diffusion sheet 60 serves to diffuse the light emitted from the light guide plate 40 so that the brightness of the light is more uniform. The prism sheet 70 is disposed on a surface of the diffuser sheet facing away from the light guide plate 40, and serves to refract, reflect, and condense light emitted from the light guide plate 40, control light emitted from the diffuser sheet 60, and improve brightness.
To explain, the light-emitting surface of the backlight module is located on a side of the light guide plate 40 departing from the reflective sheet 50, and the light-emitting surface is parallel to the surface of the reflective sheet 50.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, as shown in fig. 13, which includes the backlight module w provided in the embodiment of the present invention.
As shown in fig. 13, the display device includes a liquid crystal display panel 100 in addition to the backlight module w, and the liquid crystal display panel 100 is located on a light-emitting surface of the backlight module w (as an arrow in fig. 13 indicates a backlight source emitted by the backlight module w), so that the backlight source provided by the backlight module w can be incident into the liquid crystal display panel, thereby facilitating the display function.
As shown in fig. 12, the liquid crystal display panel 100 may include: an array substrate 110 and an opposite substrate 120 which are oppositely arranged, and a liquid crystal 130 which is positioned between the array substrate 110 and the opposite substrate 120.
In a specific implementation, the display device may be: any product or component with a display function, such as a mobile phone (as shown in fig. 14), a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator. The implementation of the display device can be seen in the above embodiments of the backlight module, and repeated descriptions are omitted.
The embodiment of the invention provides a backlight module and a display device, wherein the middle area of a flexible circuit board is provided with a shading part, and the shading part and a light-emitting element are positioned at the same side of the flexible circuit board, so that an opening is formed in the side edge, and when the flexible circuit board is arranged close to the bottom surface of a frame body, the shading part can prevent light emitted by the light-emitting element from leaking out of the opening, thereby solving the problem of light leakage of the backlight module caused when the flexible circuit board is arranged close to the bottom surface of the frame body, and improving the quality of products.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (12)

1. A backlight module, comprising:
at least one light emitting element;
the frame body comprises a bottom surface and a side edge connected with the bottom surface, and the side edge close to the light-emitting element is provided with an opening penetrating through the side edge;
the flexible circuit board is arranged close to the bottom surface of the frame body, the flexible circuit board comprises a first area, a second area and a middle area, the first area is located inside the frame body, the light-emitting element is fixed in the first area of the flexible circuit board and is away from one side surface of the bottom surface, the second area is located outside the frame body, and the middle area penetrates through the opening to be connected with the first area and the second area;
the light shielding part is arranged in the middle area of the flexible circuit board in a protruding mode, the light shielding part and the middle area of the flexible circuit board are of an integrated structure, the light shielding part and the light emitting element are located on the same side of the flexible circuit board, and the light shielding part is used for preventing light emitted by the light emitting element from leaking out of the opening.
2. The backlight module as claimed in claim 1, wherein the light-shielding portion and the opening overlap in orthographic projection on the light-emitting surface of the backlight module.
3. The backlight module as claimed in claim 2, wherein an orthogonal projection of the light shielding portion on the light-emitting surface of the backlight module falls into an orthogonal projection of the opening on the light-emitting surface of the backlight module.
4. The backlight module as claimed in claim 3, wherein the middle region of the flexible printed circuit board and the orthographic projection of the opening on the light-emitting surface of the backlight module have an overlapping region;
the orthographic projection of the shading part on the light-emitting surface of the backlight module falls into the overlapping area.
5. The backlight module as claimed in claim 2, wherein the opening is located in a middle region of the frame side;
the distance between one side of the light shielding part far away from the flexible circuit board and one side of the opening far away from the bottom surface is 0-0.15 mm in the direction perpendicular to the bottom surface.
6. The backlight module as claimed in claim 2, wherein the opening is located at an edge of a side of the frame body away from the bottom surface;
the length of the light shielding portion is greater than the length of the light emitting element in a direction along a direction perpendicular to the bottom surface.
7. The backlight module according to claim 6, wherein a difference in length between the light shielding portion and the light emitting element in a direction perpendicular to the bottom surface is greater than or equal to 0.1 mm.
8. The backlight module according to claim 6, wherein the sum of the lengths of the light shielding portion and the middle region of the flexible wiring board in a direction perpendicular to the bottom surface is less than or equal to the length of the opening.
9. The backlight module as claimed in claim 1, wherein the light-shielding portion and the opening have no overlap or connection in orthographic projection on the light-emitting surface of the backlight module;
the opening is positioned in the middle area of the side edge of the frame body;
the light shielding part is positioned in the frame body.
10. The backlight module according to claim 9, wherein the sum of the lengths of the light shielding portion and the middle region of the flexible wiring board in a direction perpendicular to the bottom surface is greater than or equal to the length of the opening;
the length of the light shielding part is larger than or equal to that of the opening in the direction parallel to the bottom surface and the side edge of the opening.
11. The backlight module as claimed in claim 9, wherein the middle region of the flexible printed circuit board and the orthographic projection of the opening on the light-emitting surface of the backlight module have an overlapping region;
the length of the flexible wiring board in the overlapping region is equal to the length of the flexible wiring board in the first region in a direction perpendicular to the bottom surface.
12. A display device, comprising: a backlight module according to any one of claims 1 to 11.
CN201910355678.4A 2019-04-29 2019-04-29 Backlight module and display device Active CN110058455B (en)

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CN110764312B (en) * 2019-11-13 2022-02-22 厦门天马微电子有限公司 Backlight module and display device
CN110806658B (en) * 2019-11-19 2022-03-08 厦门天马微电子有限公司 Backlight module and display device
CN113641039B (en) * 2021-08-02 2022-11-01 武汉华星光电技术有限公司 Backlight module and display device
CN114839808B (en) * 2022-03-29 2023-06-30 厦门天马微电子有限公司 Backlight module and display panel

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