CN109557721B - Backlight module and display device - Google Patents

Backlight module and display device Download PDF

Info

Publication number
CN109557721B
CN109557721B CN201811569725.7A CN201811569725A CN109557721B CN 109557721 B CN109557721 B CN 109557721B CN 201811569725 A CN201811569725 A CN 201811569725A CN 109557721 B CN109557721 B CN 109557721B
Authority
CN
China
Prior art keywords
area
backlight module
leds
sub
region
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201811569725.7A
Other languages
Chinese (zh)
Other versions
CN109557721A (en
Inventor
刘远明
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
Original Assignee
Xiamen Tianma Microelectronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xiamen Tianma Microelectronics Co Ltd filed Critical Xiamen Tianma Microelectronics Co Ltd
Priority to CN201811569725.7A priority Critical patent/CN109557721B/en
Publication of CN109557721A publication Critical patent/CN109557721A/en
Application granted granted Critical
Publication of CN109557721B publication Critical patent/CN109557721B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors

Landscapes

  • 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, wherein the backlight module comprises: the back plate comprises a substrate and a side frame connected with the substrate, and the substrate and the side frame form an accommodating space; a plurality of LEDs and a reflective layer disposed in the accommodating space; the LEDs are positioned on one side of the substrate facing the light-emitting surface of the backlight module and are arranged in a matrix; the reflecting layer is positioned on one side of the substrate facing the light-emitting surface of the backlight module, and the reflecting surface of the reflecting layer faces the light-emitting surface of the backlight module. The backlight module comprises a light emergent area and a non-light emergent area, wherein the non-light emergent area surrounds the light emergent area, the light emergent area comprises a first area and a second area, the first area surrounds the second area, the first area comprises a plurality of LEDs, the second area comprises a plurality of LEDs, and the reflectivity of a reflecting layer positioned in the first area is greater than that of a reflecting layer positioned in the second area. A display device comprises the backlight module. The backlight module and the display device provided by the invention can effectively solve the problem of uneven brightness of the backlight module.

Description

Backlight module and display device
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
The backlight module has an important application in the display technology field, and Light Emitting Diodes (LEDs) have a very wide application as a Light source of the backlight module due to advantages of high Light Emitting efficiency, low power consumption, wide color gamut, long service life, and the like.
Currently, backlight modules in the market can be roughly divided into a direct type backlight and a side type backlight. The side-in type backlight is that the LED is arranged at the side edge of the light guide plate, the linear light source is converted into the surface light source through the light guide plate, and the light of the surface light source is homogenized through a series of optical films. The direct type backlight LEDs are arranged in a matrix and are arranged under the display panel to directly form a surface light source, but the direct type backlight can cause the phenomenon of uneven brightness of the light-emitting surface of the backlight module due to the array arrangement mode of the LEDs.
Disclosure of Invention
In view of the above, the present invention provides a backlight module and a display device to improve the non-uniform brightness of the direct-type backlight.
A backlight module includes:
the back plate comprises a substrate and a side frame connected with the substrate, and an accommodating space is formed by the substrate and the side frame;
a plurality of LEDs and a reflective layer disposed in the accommodating space;
the LEDs are positioned on one side of the substrate facing the light-emitting surface of the backlight module and are arranged in a matrix;
the reflecting layer is positioned on one side of the substrate facing the light-emitting surface of the backlight module, and the reflecting surface of the reflecting layer faces the light-emitting surface of the backlight module;
the backlight module comprises a light emergent area and a non-light emergent area, wherein the non-light emergent area surrounds the light emergent area, the light emergent area comprises a first area and a second area, the first area surrounds the second area, the first area comprises a plurality of LEDs, the second area comprises a plurality of LEDs, and the reflectivity of the reflecting layer in the first area is greater than that of the reflecting layer in the second area.
A display device comprises the backlight module.
The backlight module and the display device provided by the invention at least realize the following beneficial effects:
the direct type backlight module has the problem that the brightness of the light-emitting surface of the backlight module is uneven due to the array arrangement mode of the LEDs. The invention can effectively improve the problem of uneven light emission of the backlight module by setting the reflectivity of the reflecting layer of the direct type backlight peripheral area to be larger than that of the reflecting layer of the middle area, and particularly can improve the problem of blue or dark periphery of the backlight module.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, the inventive content of the present invention is not limited to the embodiments shown in the following drawings, and other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a top view of a backlight module according to an embodiment of the invention;
FIG. 2 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 3 is a top view of another backlight module according to an embodiment of the present invention;
FIG. 4 is a top view of a backlight module according to another embodiment of the present invention;
FIG. 5 is a top view of a backlight module according to another embodiment of the present invention;
FIG. 6 is a top view of a backlight module according to an embodiment of the present invention;
FIG. 7 is a top view of another backlight module according to an embodiment of the present invention;
FIG. 8 is a top view of a display device according to an embodiment of the present invention;
fig. 9 is a cross-sectional view taken along line C-C of fig. 8.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, and thus the present invention is not limited to the specific embodiments disclosed below.
In the field of display technologies, direct type backlight has been more and more widely used, and the inventor finds that, in the process of research, because direct type backlight uses LEDs as light sources, a plurality of LEDs are arranged in a matrix and are disposed right below a display panel to directly obtain a surface light source, but due to the arrangement of the LEDs in the matrix, the light output amount of the peripheral area of the backlight module is smaller than that of the middle area of the backlight module, which may result in uneven light emission of the backlight module, specifically may be represented as a phenomenon that the periphery is bluing or darkening. In general, a backlight module uses a blue LED in combination with a corresponding phosphor to obtain white light, and in this case, the periphery of the backlight module is blue. If the backlight module directly uses the white light LED, the periphery of the backlight module will be darkened. It should be noted that, the present application is not limited to what kind of LEDs are used as the light source of the backlight module.
In view of the above, the present invention provides a backlight module to improve the problem of blue or dark surrounding of a direct-type backlight.
Fig. 1 is a top view of a backlight module according to an embodiment of the invention, fig. 2 is a cross-sectional view taken along B-B of fig. 1, and as shown in fig. 1 and fig. 2, a backlight module 100 includes:
the back plate comprises a substrate 130 and a side frame 140 connected with the substrate 130, wherein the substrate 130 and the side frame 140 form an accommodating space 150;
a plurality of LEDs 110 and a reflective layer 120 disposed in the accommodating space 150;
the LEDs 110 are located on one side of the substrate 130 facing the light emitting surface of the backlight module 100, and the LEDs 110 are arranged in a matrix;
the reflective layer 120 is located on a side of the substrate 130 facing the light-emitting surface of the backlight module 100, and a reflective surface of the reflective layer 120 faces the light-emitting surface of the backlight module 100;
the backlight module 100 comprises a light emergent area A2 and a non-light emergent area A1, wherein the non-light emergent area A1 surrounds the light emergent area A2, the light emergent area A2 comprises a first area A21 and a second area A22, the first area A21 surrounds the second area A22, the first area A21 comprises a plurality of LEDs 110, the second area A22 comprises a plurality of LEDs 110, and the reflectivity of a reflecting layer 121 located in the first area A21 is greater than that of a reflecting layer 122 located in the second area A22.
It should be noted that a driving circuit layer (not shown in fig. 2) may be disposed on a side of the substrate 130 facing the LEDs 110, the LEDs 110 arranged in a matrix may be formed on the driving circuit layer, the LEDs 110 are electrically connected to the driving circuit layer, and the reflective layer 120 may be disposed on a side of the driving circuit layer away from the substrate 130. The driving Circuit layer may be a Printed Circuit Board (PCB) or a driving substrate including a plurality of thin film transistors arranged in an array, and the present invention is not particularly limited to the fixing manner and the driving manner of the LED and the composition structure of the driving Circuit layer.
It should be further noted that the reflective layer 120 is used to increase the utilization rate of the light emitted by the LED110, specifically, as shown in fig. 2, a light path diagram of the light emitted by the LED110 reflected by the reflective layer 120 is shown, where the light emitted by the LED110 directly emitted to the light emitting surface of the backlight module 100 is not shown in the drawing, and only a part of the light emitted by the LED110 is exemplarily shown in fig. 2 to be emitted to the light emitting surface of the backlight module 100 after being reflected by the reflective layer 120. The number and arrangement of the LEDs shown in all the drawings of the present application are only schematic, and the present invention is not limited to the number of LEDs, the number of LEDs in different areas, and the specific manner of arranging the LED arrays.
The backlight module provided by the embodiment divides the light emitting area of the backlight module into a first area located in the peripheral area of the backlight module and a second area located in the middle area of the backlight module, and the reflectivity of the reflecting layer of the first area is set to be greater than that of the reflecting layer of the second area, so that the utilization rate of light emitted by the LEDs in the peripheral area of the backlight module, namely the first area, is increased, the problem of uneven brightness of the backlight module caused by the fact that the light emitting amount of the peripheral area of the backlight module is smaller than that of the middle area can be solved, and the problem of blue light emission or dark light emission of the periphery of the backlight module is specifically solved.
Optionally, fig. 3 is a top view of another backlight module according to an embodiment of the invention, and as shown in fig. 2 and fig. 3, the first region a21 includes a third sub-region a213 and a fourth sub-region a214, the light exit region A2 includes a first edge S1 and a second edge S2 connected to each other, the first edge S1 and the second edge S2 extend in different directions, the third sub-region a213 is connected to both the first edge S1 and the second edge S2, the fourth sub-region a214 is connected to only one of the first edge S1 and the second edge S2, and both the third sub-region a213 and the fourth sub-region a214 include a plurality of LEDs 110.
Along the extending direction of the first edge S1 and the extending direction of the second edge S2, the third sub-area a213, the fourth sub-area a214, and the third sub-area a213 are sequentially arranged, the reflectivity of the reflective layer 120 located in the third sub-area a213 is greater than the reflectivity of the reflective layer 120 located in the fourth sub-area a214, and the reflectivity of the reflective layer 120 located in the fourth sub-area a214 is greater than the reflectivity of the reflective layer 120 located in the second area a 22.
It should be noted that fig. 4 is a top view of another backlight module according to an embodiment of the present invention, as shown in fig. 4, different from the embodiment of fig. 3, the boundary of the third sub-region a213 is expanded in a direction toward the fourth sub-region a214, that is, the shape of the third sub-region a213 is "l-shape or" ribbon-shape or "profile-profile", but the position and the shape of the boundary of the third sub-region and the fourth sub-region are not limited in the embodiment of the present invention, and the position and the shape of the boundary of the first region and the second region are also not limited, and may be adjusted according to specific situations.
In the backlight module provided by this embodiment, since the light output amount of the peripheral area of the backlight module is less than the light output amount of the middle area, which results in uneven brightness of the backlight module, especially appears as peripheral bluing or peripheral darkening, and further, the light output amount of the corner of the backlight module is less than the light output amounts of other areas, the peripheral area of the backlight module, that is, the first area, is further divided into a third sub-area and a fourth sub-area in detail, the third sub-area is a corner area of the backlight module, and the reflectivity of the reflective layer of the third sub-area is set to be greater than the reflectivity of the reflective layer of the fourth sub-area, so as to further refine and improve the bluing or darkening phenomenon of the corner of the backlight module more than other areas, and make the brightness of the backlight module more uniform.
Optionally, fig. 5 is a top view of another backlight module according to an embodiment of the invention, as shown in fig. 5, the first region a21 includes a third sub-region a213, a fourth sub-region a214 and a fifth sub-region a215, the third sub-region a213, the fourth sub-region a214, the fifth sub-region a215, the fourth sub-region a214 and the third sub-region a213 are sequentially arranged along the extending direction of the first edge S1 and the extending direction of the second edge S2, and the third sub-region a213, the fourth sub-region a214 and the fifth sub-region a215 all include a plurality of LEDs. Here, the reflectivity of the reflective layer of the third sub-area a213 is greater than the reflectivity of the reflective layer of the fourth sub-area a214, the reflectivity of the reflective layer of the fourth sub-area a214 is greater than the reflectivity of the reflective layer of the fifth sub-area a215, and the reflectivity of the reflective layer of the fifth sub-area a215 is greater than the reflectivity of the reflective layer of the second area a 22.
It should also be noted that, in the embodiments of the present invention, the number of the sub-regions of the first region and the position arrangement manner of the sub-regions are not limited, and the position and the shape of the boundary between the sub-regions of the light exit region are not limited, which are determined by specific conditions.
The backlight module provided by the embodiment increases the number of the sub-partitions of the first area of the backlight module, and performs more fine adjustment on the phenomenon of improving the uneven light output of the backlight module.
Optionally, as shown in fig. 2, the reflective layer 120 is provided with a hollow area 123, and an orthogonal projection of the LED110 on the substrate 130 is located within an orthogonal projection of the hollow area 123 on the substrate 130.
It should be noted that a driving circuit layer (not shown in fig. 2) may be disposed on a side of the substrate 130 facing the LEDs 110, the LEDs 110 arranged in a matrix may be formed on the driving circuit layer, the LEDs 110 are electrically connected to the driving circuit layer, and the reflective layer 120 may be disposed on a side of the driving circuit layer away from the substrate 130. The driving Circuit layer may be a Printed Circuit Board (PCB) or a driving substrate including a plurality of thin film transistors arranged in an array, and the present invention is not particularly limited to the fixing manner and the driving manner of the LED and the composition structure of the driving Circuit layer. The reflective layer 120 needs to be designed with corresponding hollow-out avoidance at the position of the LED 110.
In the backlight module provided by this embodiment, the hollow-out region is disposed on the reflective layer, which is favorable for connecting and driving the LED110 and the driving circuit on the substrate 130.
Optionally, the material of the reflective layer 120 is ink. When the material of the reflective layer 120 is ink, the reflective layer may be disposed by coating, and the ink is coated on a side of the substrate 130 facing the light emitting surface of the backlight module. The present invention is not limited to the manner of disposing the reflective layer.
Specifically, as shown in fig. 1, inks having different reflectivities are disposed in the first area a21 and the second area a22, respectively, and the reflectivity of the ink in the first area a21 is greater than the reflectivity of the ink in the second area a 22.
Further, as shown in the backlight module 100 in fig. 3, the reflectivity of the ink in the third sub-area a213 is greater than the reflectivity of the ink in the fourth sub-area a214, and the reflectivity of the ink in the fourth sub-area a214 is greater than the reflectivity of the ink in the second sub-area a 22.
In the backlight module provided by this embodiment, the material of the reflective layer is ink, the reflectance of the ink in the first region a21 is set to be greater than the reflectance of the ink in the second region a22, and the reflectance of the ink in the third sub-region a213 is set to be greater than the reflectance of the ink in the fourth sub-region a214, so that the problem of blue light emission or dark light emission around the backlight module due to the fact that the light emission amount of the peripheral region is less than that of the middle region of the backlight module can be solved. Meanwhile, the ink can be coated in the accommodating space of the backlight module in a coating mode, and the process is simple and easy to realize.
Optionally, the material of the reflective layer 120 is a reflective sheet. When the reflective layer 120 is made of a reflective sheet, the reflective layer may be disposed by attaching the reflective sheet on a side of the substrate 130 facing the light emitting surface of the backlight module. The present invention is not limited to the manner of disposing the reflective layer.
Specifically, as shown in fig. 1, the first area a21 and the second area a22 are respectively provided with reflective sheets having different reflectivities, and the reflectivity of the reflective sheet located in the first area a21 is greater than that of the reflective sheet located in the second area a 22.
Further, as shown in fig. 3, in the backlight module, the reflectivity of the reflective sheet located in the third sub-area a213 is greater than the reflectivity of the reflective sheet located in the fourth sub-area a214, and the reflectivity of the reflective sheet located in the fourth sub-area a214 is greater than the reflectivity of the reflective sheet located in the second sub-area a 22.
In the backlight module provided by this embodiment, the reflective layer is made of the reflective sheet, the reflective sheet located in the first region a21 has a reflectivity greater than that of the reflective sheet located in the second region a22, and the reflective sheet located in the third sub-region a213 has a reflectivity greater than that of the reflective sheet located in the fourth sub-region a214, so as to improve the problem that the periphery of the backlight module is bluish or the periphery is dark due to the light output amount of the peripheral region being smaller than that of the middle region. Meanwhile, the reflector plate can be attached in the accommodating space of the backlight module in an attaching mode, and the process is simple and easy to achieve.
It should be noted that the material of the reflective layer 120 is not specifically limited in the present invention, and any material that can perform a reflective function may be applied to the backlight module provided in the present invention.
Alternatively, as shown in fig. 1 and 2, the reflectivity of the reflective layer at the first region a21 is greater than the reflectivity of the reflective layer at the second region a22, and the luminance of the LED110 disposed at the first region a21 is greater than the luminance of the LED disposed at the second region a 22.
Further, in order to achieve the luminance of the LED110 of the first region a21 greater than the luminance of the LED110 of the second region a22, the current through the LED110 of the first region a21 may be set greater than the current through the LED110 of the second region a 22.
Specifically, the backlight module of this embodiment may further include a control module and a driving circuit (not shown in fig. 1), where the control module and the driving circuit control and drive the LEDs to emit light, and the LEDs in the same area may be connected to each other in a serial or parallel manner, or connected to each other in multiple combinations of serial and parallel, where the invention is not limited in this respect. The control module may be used to control the current passing through the LEDs in different regions, so as to realize that the current passing through the LEDs in the first region a21 is greater than the current passing through the LEDs in the second region a22, and the control module and the driving circuit are not limited specifically, and are only exemplary to illustrate the embodiment herein, and the manner of realizing the current passing through the LEDs in different regions is not limited specifically.
In the backlight module provided by this embodiment, by setting the luminance of the LED in the first area a21 to be greater than the luminance of the LED in the second area a22, and setting the current passing through the LED in the first area a21 to be greater than the current passing through the LED in the second area a22, on the basis that the reflectivity of the reflective layer in the first area a21 is greater than the reflectivity of the reflective layer in the second area a22, the problem of the backlight module that the periphery of the backlight module is bluish or the periphery is dark due to the light output amount in the periphery area being less than the light output amount in the middle area can be further improved.
Alternatively, as shown in fig. 2 and 3, on the basis that the reflectivity of the reflective layer located in the third sub-area a213 is greater than the reflectivity of the reflective layer located in the fourth sub-area a214, the brightness of the LEDs 110 of the first area a21 is set to be greater than the brightness of the LEDs 110 of the second area a 22. The first region a21 includes a third sub-region a213 and a fourth sub-region a214, and the brightness of the LEDs 110 of the third sub-region a213 is set to be greater than the brightness of the LEDs 110 of the fourth sub-region a 214.
Further, in order to realize that the luminance of the LEDs 110 of the first region a21 is greater than the luminance of the LEDs of the second region a22, and the luminance of the LEDs 110 of the third sub-region a213 is greater than the luminance of the LEDs 110 of the fourth sub-region a214, it is possible to set the current through the LEDs 110 of the first region a21 to be greater than the current through the LEDs 110 of the second region a22, and to set the current through the LEDs 110 of the third sub-region a213 to be greater than the current through the LEDs 110 of the fourth sub-region a 214.
Specifically, the backlight module of this embodiment may further include a control module and a driving circuit (not shown in fig. 3), where the control module and the driving circuit control and drive the LEDs to emit light, and the LEDs in the same area may be connected to each other in a serial or parallel manner, or connected to each other in multiple combinations of serial and parallel, where the invention is not limited in this respect. The control module may be configured to control the current of the LED in different areas, where the control module and the driving circuit are not specifically limited, and this is only an exemplary embodiment, and the manner of implementing the current of the LED in different areas is not specifically limited.
In the backlight module provided by this embodiment, the control of the magnitude of the current passing through the LEDs may be implemented by arranging a control module and a driving circuit in the backlight module, where the control module controls the current of the LEDs in different backlight regions through the driving circuit, so that the current passing through the LEDs 110 in the first region a21 is greater than the current passing through the LEDs 110 in the second region a22, and the current passing through the LEDs 110 in the third sub-region a213 is greater than the current passing through the LEDs 110 in the fourth sub-region a214, thereby implementing that the brightness of the LEDs 110 in the first region a21 is greater than the brightness of the LEDs 110 in the second region a22, and the brightness of the LEDs 110 in the third sub-region a213 is greater than the brightness of the LEDs 110 in the fourth sub-region a 214. However, the present embodiment is not particularly limited to the manner of controlling the current passing through the LED.
According to the backlight module provided by the embodiment, by setting the difference of the brightness of the LEDs in different backlight areas, specifically, the brightness of the LEDs at the periphery of the backlight module is greater than that of the LEDs in the middle area of the backlight module, the area division of the periphery area of the backlight module is more fine, and the brightness difference design of the LEDs in each area is adopted, so that the problem that the periphery of the backlight module is bluish or the periphery is dark due to the fact that the light output amount of the periphery area is smaller than that of the middle area of the backlight module is solved.
Alternatively, as shown in fig. 1 and 2, the plurality of LEDs 110 has at least two brightness levels.
Specifically, fig. 6 is a top view of a backlight module according to an embodiment of the present invention, and referring to fig. 1 and 6, the LEDs 110 in fig. 6 are not shown, and based on that the reflectivity of the reflective layer located in the first area a21 is greater than the reflectivity of the reflective layer located in the second area a22, and the reflectivity of the reflective layer located in the third sub-area a213 is greater than the reflectivity of the reflective layer located in the fourth sub-area a214, the brightness level of the LEDs 110 in the second area a22 is set to Y, the brightness level of the LEDs 110 in the first area a21 is Y + N, N is a positive integer greater than or equal to 1, the current passing through each LED110 is set to be the same, and the brightness of the LED110 corresponding to the brightness level Y + N is greater than the brightness of the LED110 corresponding to the brightness level Y.
In the backlight module provided by the embodiment, on the basis that the reflection layers with different reflectivities are arranged in different areas, the LEDs with different brightness levels are additionally introduced, the current passing through each LED is set to be the same, the brightness of the brightness levels of the LEDs positioned at the periphery of the backlight module is greater than that of the LEDs positioned in the middle area of the backlight module, and the problem that the periphery of the backlight module is bluish or the periphery is dark due to the fact that the light output amount of the periphery area is less than that of the middle area of the backlight module is further improved.
Optionally, fig. 7 is a top view of another backlight module according to an embodiment of the present invention, where the LEDs 110 in fig. 7 are not shown, and as shown in fig. 3 and 7, the current passing through each LED110 is set to be the same, the brightness level of the LED110 in the second area a22 is set to be Y, the brightness level of the LED110 in the third sub-area a213 is set to be Y +2, the brightness level of the LED110 in the fourth sub-area a214 is Y +1, the brightness of the LED110 corresponding to the brightness level Y +2 is greater than the brightness of the LED110 corresponding to the brightness level Y +1, and the brightness of the LED110 corresponding to the brightness level Y +1 is greater than the brightness of the LED110 corresponding to the brightness level Y.
It should be noted that the present invention is not limited to the number of partitions of the backlight module and the number of the LED brightness levels, which is determined as the case may be.
The backlight module provided by the embodiment is subjected to more detailed partitioning, meanwhile, the LEDs with a plurality of brightness gears are introduced, the current passing through each LED is set to be the same, the brightness of the brightness gears of the LEDs at the periphery of the backlight module is greater than that of the brightness gears of the LEDs at the middle area of the backlight module, the brightness of the brightness gears of the LEDs at the corners of the backlight module is greater than that of the brightness gears of the LEDs at the peripheral area of the backlight module between the corners, and the problem that the periphery of the backlight module is bluish or the periphery is dark due to the fact that the light quantity of the peripheral area is smaller than that of the middle area of the backlight module is more finely improved.
Fig. 8 is a top view of a display device according to an embodiment of the invention, and the display device 200 includes the backlight module 100 as described above.
Specifically, fig. 9 is a cross-sectional view taken along line C-C of fig. 8, as shown in fig. 9, the backlight module 100 further includes an optical film layer 160, the optical film layer 160 is located on a side of the LED110 away from the substrate 130, where the optical film layer 160 may include a diffuser, a brightness enhancement film, and a fluorescent film layer, and the invention is not limited to the optical film layer 160, as the case may be. The display device 200 includes the backlight module 100, a display panel 210 and a cover plate 220, wherein the display panel 210 is located at a light emitting side of the backlight module 100, and the cover plate 220 is located at a side of the display panel 210 away from the backlight module 100. The display panel 210 may be a liquid crystal display panel or other display panels requiring a backlight module, and the liquid crystal display panel generally includes an array substrate, a color film substrate and a liquid crystal layer therebetween, which are designed oppositely. The drawings and embodiments of the present invention are not limited to the specific structure and composition of the display device, as the case may be.
The display device can be an electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, a display and the like, has relevant characteristics and corresponding technical effects, and is not described again here.
In the field of display technologies, direct type backlight has been more and more widely used, and the inventor finds that, in the process of research, because direct type backlight uses LEDs as light sources, a plurality of LEDs are arranged in a matrix and are disposed right below a display panel to directly obtain a surface light source, but due to the arrangement of the LEDs in the matrix, the light output amount of the peripheral area of the backlight module is smaller than that of the middle area of the backlight module, which may result in uneven light emission of the backlight module, specifically may be represented as a phenomenon that the periphery is bluing or darkening. In general, a backlight module uses a blue LED in combination with a corresponding phosphor to obtain white light, and in this case, the periphery of the backlight module is blue. If the backlight module directly uses the white light LED, the periphery of the backlight module will be darkened.
In view of the above, the present invention provides a backlight module and a display device to improve the problem of blue or dark around the direct-type backlight. The light-emitting areas of the backlight module are partitioned into a plurality of partitions located in the peripheral area of the backlight module and a plurality of partitions located in the middle area of the backlight module, and the reflectivity of the reflecting layer of the peripheral area of the backlight module is larger than that of the reflecting layer of the middle area of the backlight module, so that the utilization rate of light emitted by LEDs of the peripheral area of the backlight module is increased, the problem that the brightness of the backlight module is uneven due to the fact that the light-emitting amount of the peripheral area of the backlight module is smaller than that of the middle area of the backlight module can be solved, and the problem that the periphery of the backlight module is bluish or the periphery of the backlight module is darkened can be solved.

Claims (9)

1. A backlight module is characterized in that the backlight module comprises:
the back plate comprises a substrate and a side frame connected with the substrate, and an accommodating space is formed by the substrate and the side frame;
the LED and reflection layer are arranged in the accommodating space, the substrate faces the driving circuit layer on one side of the LED, the LED is electrically connected with the driving circuit layer, and the reflection layer is arranged on one side, far away from the substrate, of the driving circuit layer;
the LEDs are positioned on one side of the substrate facing the light-emitting surface of the backlight module and are arranged in a matrix;
the reflecting layer is positioned on one side of the substrate facing the light-emitting surface of the backlight module, and the reflecting surface of the reflecting layer faces the light-emitting surface of the backlight module;
the backlight module comprises a light emergent area and a non-light emergent area, the non-light emergent area surrounds the light emergent area, the light emergent area comprises a first area and a second area, the first area surrounds the second area, the first area comprises a plurality of LEDs, the second area comprises a plurality of LEDs, and the reflectivity of the reflecting layer in the first area is greater than that of the reflecting layer in the second area;
the LEDs are provided with at least two brightness levels, the brightness level of the LEDs in the second area is Y, the brightness level of the LEDs in the first area is Y + N, N is a positive integer greater than or equal to 1, the current passing through each LED is the same, and the brightness of the LED corresponding to the brightness level Y + N is greater than that of the LED corresponding to the brightness level Y.
2. The backlight module according to claim 1, wherein the first region comprises a third sub-region and a fourth sub-region, the light emergent region comprises a first edge and a second edge connected with each other, the first edge and the second edge extend in different directions, the third sub-region is connected with the first edge and the second edge at the same time, and the fourth sub-region is connected with only one of the first edge and the second edge;
the third sub-area, the fourth sub-area and the third sub-area are sequentially arranged along the extending direction of the first edge and the extending direction of the second edge, and the reflectivity of the reflection layer located in the third sub-area is greater than the reflectivity of the reflection layer located in the fourth sub-area.
3. The backlight module according to claim 1, wherein the reflective layer is provided with a hollow area, and an orthogonal projection of the LED on the substrate is located within an orthogonal projection of the hollow area on the substrate.
4. A backlight module according to claim 1, wherein the reflective layer is made of ink.
5. A backlight module according to claim 1, wherein the reflective layer is made of a reflective sheet.
6. The backlight module as claimed in claim 1, wherein the brightness of the LEDs in the first region is greater than that of the LEDs in the second region.
7. A backlight module according to claim 2, wherein the brightness of the LEDs in the third sub-region is greater than the brightness of the LEDs in the fourth sub-region.
8. The backlight module as claimed in claim 2, wherein the brightness level of the LEDs in the third sub-area is Y +2, the brightness level of the LEDs in the fourth sub-area is Y +1, and the brightness of the LEDs corresponding to the brightness level Y +2 is greater than the brightness of the LEDs corresponding to the brightness level Y + 1.
9. A display device, characterized in that the display device comprises a backlight module according to any one of claims 1-8.
CN201811569725.7A 2018-12-21 2018-12-21 Backlight module and display device Active CN109557721B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811569725.7A CN109557721B (en) 2018-12-21 2018-12-21 Backlight module and display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811569725.7A CN109557721B (en) 2018-12-21 2018-12-21 Backlight module and display device

Publications (2)

Publication Number Publication Date
CN109557721A CN109557721A (en) 2019-04-02
CN109557721B true CN109557721B (en) 2022-01-07

Family

ID=65870758

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811569725.7A Active CN109557721B (en) 2018-12-21 2018-12-21 Backlight module and display device

Country Status (1)

Country Link
CN (1) CN109557721B (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110471217B (en) * 2019-07-23 2022-01-14 厦门天马微电子有限公司 Display module and display device
CN113078179A (en) * 2020-01-06 2021-07-06 群创光电股份有限公司 Electronic device
WO2021190414A1 (en) 2020-03-25 2021-09-30 海信视像科技股份有限公司 Display device
CN114428421B (en) * 2020-10-29 2023-04-18 海信视像科技股份有限公司 Display device
WO2021190399A1 (en) 2020-03-25 2021-09-30 海信视像科技股份有限公司 Display device
WO2021218478A1 (en) 2020-04-28 2021-11-04 海信视像科技股份有限公司 Display apparatus
CN111679494B (en) * 2020-06-02 2021-09-03 Tcl华星光电技术有限公司 Backlight module and manufacturing method thereof
CN114815380A (en) * 2021-01-28 2022-07-29 南京瀚宇彩欣科技有限责任公司 Backlight module and display device
CN115692453A (en) * 2021-07-30 2023-02-03 合肥京东方星宇科技有限公司 Array substrate, preparation method thereof, light-emitting device and splicing display device
CN113759601A (en) * 2021-08-26 2021-12-07 合肥京东方瑞晟科技有限公司 Backlight module and display device

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04162002A (en) * 1990-10-25 1992-06-05 Mitsubishi Rayon Co Ltd Plane light source in edge light system
CN1932618A (en) * 2005-09-15 2007-03-21 Nec液晶技术株式会社 Backlight unit
CN101025517A (en) * 2006-02-24 2007-08-29 鸿富锦精密工业（深圳）有限公司 Backlight module
CN101315494A (en) * 2007-06-01 2008-12-03 株式会社日立制作所 Liquid crystal display device
CN201607597U (en) * 2009-10-27 2010-10-13 彩虹集团公司 Direct LED backlight source apparatus
CN101936487A (en) * 2010-08-20 2011-01-05 深圳市华星光电技术有限公司 Backlight module
CN103047609A (en) * 2012-12-07 2013-04-17 辅讯光电工业（苏州）有限公司 Reflecting film, backlight module provided with same and display device provided with same
CN103185294A (en) * 2013-04-07 2013-07-03 京东方科技集团股份有限公司 Light guide plate manufacturing method
CN204513110U (en) * 2015-02-28 2015-07-29 青岛海信电器股份有限公司 Backlight module and display unit
CN207049680U (en) * 2017-08-21 2018-02-27 广州视源电子科技股份有限公司 Direct type backlight module and display

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04162002A (en) * 1990-10-25 1992-06-05 Mitsubishi Rayon Co Ltd Plane light source in edge light system
CN1932618A (en) * 2005-09-15 2007-03-21 Nec液晶技术株式会社 Backlight unit
CN101025517A (en) * 2006-02-24 2007-08-29 鸿富锦精密工业（深圳）有限公司 Backlight module
CN101315494A (en) * 2007-06-01 2008-12-03 株式会社日立制作所 Liquid crystal display device
CN201607597U (en) * 2009-10-27 2010-10-13 彩虹集团公司 Direct LED backlight source apparatus
CN101936487A (en) * 2010-08-20 2011-01-05 深圳市华星光电技术有限公司 Backlight module
CN103047609A (en) * 2012-12-07 2013-04-17 辅讯光电工业（苏州）有限公司 Reflecting film, backlight module provided with same and display device provided with same
CN103185294A (en) * 2013-04-07 2013-07-03 京东方科技集团股份有限公司 Light guide plate manufacturing method
CN204513110U (en) * 2015-02-28 2015-07-29 青岛海信电器股份有限公司 Backlight module and display unit
CN207049680U (en) * 2017-08-21 2018-02-27 广州视源电子科技股份有限公司 Direct type backlight module and display

Also Published As

Publication number Publication date
CN109557721A (en) 2019-04-02

Similar Documents

Publication Publication Date Title
CN109557721B (en) Backlight module and display device
US7633577B2 (en) Light emitting diode backlight unit and liquid crystal display device using the same
CN108333822B (en) Liquid crystal display device having a plurality of pixel electrodes
EP2288957B1 (en) Led back-light unit and liquid crystal display device using the same
JP4729720B2 (en) Planar illumination device and liquid crystal display device using the planar illumination device as a backlight
RU2491472C1 (en) Illumination device and display device
US20060215075A1 (en) Backlight Module of LCD Device
US20070002565A1 (en) Backlight unit
US20130070170A1 (en) Lighting device, display device and television device
US20090168456A1 (en) Light source module for a display device and a display device having the same
KR20080001755A (en) Backlight assembly and liquid crystal display divice having the same
CN111505868A (en) Backlight module and display panel
CN1837925A (en) Backlight apparatus and liquid crystal display apparatus
CN107991810B (en) Backlight and liquid crystal display
CN113985656B (en) Backlight source, backlight module and display device
CN114153095A (en) Backlight module, preparation method thereof and display device
KR20150014194A (en) Back light assembly and Liquid crystal display apparatus having the same
KR20160084554A (en) Backlight unit and display device comprising the same
CN114864797B (en) Light-emitting panel and display device
EP4050407A1 (en) Display device
WO2019012793A1 (en) Light emitting device, display device, and illuminating device
KR20090099785A (en) Light emitting diode package, backlight unit and liquid crystal display having thesame
US8002453B2 (en) Light-emitting diode backlight module and liquid crystal display using the same
CN115826296A (en) Backlight module
CN115407548A (en) Display device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant