CN110196512B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN110196512B CN110196512B CN201910462746.7A CN201910462746A CN110196512B CN 110196512 B CN110196512 B CN 110196512B CN 201910462746 A CN201910462746 A CN 201910462746A CN 110196512 B CN110196512 B CN 110196512B
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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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
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- Crystallography & Structural Chemistry (AREA)
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- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The application provides a backlight module and a display device, which are used for improving the display effect of the display device due to uneven brightness. The backlight module comprises a frame body and an optical component; one surface of the bottom plate of the frame body facing the optical component comprises a first area, a second area and a third area which are sequentially distributed along the light-emitting direction of the backlight source; the first area is positioned on one side of the backlight source and the light guide plate close to the bottom plate, and the second area and the third area are positioned on one side of the light guide plate close to the bottom plate; the plane where the first area is located and the plane where the third area is located are both parallel to the light guide plate, and the relative distance between the plane where the first area is located and the light guide plate is larger than the relative distance between the plane where the third area is located and the light guide plate; the boundary of one side, close to the backlight source, of the second area is connected with the first area, and the boundary of one side, far away from the backlight source, of the second area is connected with the third area; the backlight source comprises a plurality of LEDs, and a reflecting layer is arranged on the second area.
Description
Technical Field
The application relates to the technical field of display, in particular to a backlight module and a display device.
Background
At present, most display devices adopt a side-light type backlight structure to reduce the thickness of the backlight module. In the conventional edge-type backlight module, a plurality of light-emitting diodes (LEDs) are generally disposed at the side of the light guide plate to provide light. Because the LEDs are point light emitters, the light emitting state is fan-shaped emission, and the brightness of the center is generally the largest, when the light mixing distance is small, the dark area between adjacent LED lamps will be highlighted, so that the light guide plate has an obvious dark-bright alternative phenomenon at a position close to the backlight source, that is, the display device has a Hotspot (uneven brightness) phenomenon in the display area in front of the LED lamps, which affects the overall display effect of the display device.
Content of application
The embodiment of the application provides a backlight module and a display device, which are used for solving the problem of uneven brightness of a lamp in front of the display device in the prior art and improving the overall display effect of the display device.
In a first aspect, an embodiment of the present application provides a backlight module, which includes a frame and an optical component;
the frame body comprises a bottom plate and a side plate positioned on the periphery of the bottom plate, the bottom plate and the side plate form an accommodating space, and the optical component is positioned in the accommodating space;
the optical component comprises a light guide plate and a backlight source arranged on one side of the light guide plate; the top surface of the light guide plate is a light-emitting surface and is positioned on one side far away from the bottom plate; the side surface of the light guide plate is a light incident surface and is arranged adjacent to the light emergent surface of the backlight source, and the light emergent surface of the backlight source is intersected with the plane of the light guide plate;
one surface of the bottom plate facing the accommodating space comprises a first area, a second area and a third area which are sequentially distributed along a first direction; the first direction is the light-emitting direction of the backlight source, the first area is located on one side, close to the bottom plate, of the backlight source and the light guide plate, and the second area and the third area are located on one side, close to the bottom plate, of the light guide plate; the plane where the first area is located and the plane where the third area is located are both parallel to the plane where the light guide plate is located, and the relative distance between the plane where the first area is located and the light guide plate is larger than the relative distance between the plane where the third area is located and the light guide plate; the boundary of one side, close to the backlight source, of the second area is connected with the first area, and the boundary of one side, far away from the backlight source, of the second area is connected with the third area;
the backlight source comprises a plurality of LEDs, and a reflecting layer is arranged on the second area.
In a possible implementation manner, in the backlight module provided in the embodiment of the present application, a plane where the second region is located is an inclined plane relative to the light guide plate.
In a possible implementation manner, in the backlight module provided in the embodiment of the present application, any two adjacent LEDs have a corresponding first position and a corresponding second position on the second region; the projection of the first position on the plane of the light guide plate is positioned on a midperpendicular of a central connecting line of two projections of any two adjacent LEDs on the plane of the light guide plate; a connecting line of the projection of the second position on the plane where the light guide plate is located and the center of the projection of one LED of the any two adjacent LEDs on the plane where the light guide plate is located is parallel to the perpendicular bisector; the reflectivity at the first location is greater than the reflectivity at the second location.
In a possible implementation manner, in the backlight module provided in this embodiment of the application, the reflectivity at the first position is greater than or equal to 80%.
In a possible implementation manner, in the backlight module provided in this embodiment of the application, the reflectivity at the second position is less than or equal to 5%.
In a possible implementation manner, in the backlight module provided in this embodiment of the application, the reflectivity on the second area decreases from the first position to the second position.
In a possible implementation manner, in the backlight module provided in this embodiment of the application, the second region includes a first sub-region and a second sub-region that are alternately arranged along a second direction, and the second direction is perpendicular to the first direction; the first location is located in the first sub-region and the second location is located in the second sub-region; the reflectivity over the first sub-area is less than the reflectivity over the second sub-area.
In a possible implementation manner, in the backlight module provided in the embodiment of the present application, the reflectivity at each position on the first sub-region is a first preset value; and the reflectivity at each position on the second sub-area is a second preset value.
In a possible implementation manner, in the backlight module provided in this embodiment of the application, the reflective layer is a reflective strip adhered to the second area or a reflective material sprayed on the second area.
In a possible implementation manner, in the backlight module provided in the embodiment of the present application, the material of the reflective layer is silver plating and/or ink.
In a possible implementation manner, in the backlight module provided in the embodiment of the present application, an included angle between a plane where the second region is located and a plane where the first region and the third region are located is 135 to 165 °.
In a possible implementation manner, in the backlight module provided in the embodiment of the present application, the light guide plate includes a display area and a non-display area except for the display area; the projection of the second area on the plane where the light guide plate is located in the display area.
In a possible implementation manner, in the backlight module provided in this embodiment of the application, a distance a between a boundary of the display area close to one side of the backlight source and a light exit position of the backlight source is greater than 1 mm; the ratio A/P of the A to the center-to-center distance P between every two adjacent LEDs is more than 0.4.
In a possible implementation manner, in the backlight module provided in this embodiment of the application, a distance L1 between a boundary of the second region on a side close to the backlight source and a light exit position of the backlight source is 1 to 5 mm;
in a possible implementation manner, in the backlight module provided in an embodiment of the present application, the optical component further includes: the reflecting sheet is positioned on one side of the light emergent surface which is far away from the light guide plate; the light guide plate comprises a diffusion sheet, a lower brightness enhancement sheet and an upper brightness enhancement sheet, wherein the diffusion sheet is positioned on one side of a light emitting surface of the light guide plate, the lower brightness enhancement sheet is positioned on one side of the diffusion sheet, which is far away from the light emitting surface, and the upper brightness enhancement sheet is positioned on one side of the lower brightness enhancement sheet, which is far away from the diffusion sheet.
In a second aspect, an embodiment of the present application provides a display device, including: the backlight module according to the first aspect of the present embodiment or any one of the possible implementation manners of the first aspect, and the display panel disposed above the light exit surface of the backlight module.
The beneficial effect of this application is as follows:
the embodiment of the application provides a pair of backlight unit and display device, set up the reflection stratum through the second area on backlight unit's bottom plate, the reflection stratum will be from the light reflection of backlight source receipt back to the light guide plate, and then the luminance in dark shadow district in the display area before the compensation light guide plate lamp, bright dark uneven problem before display device's the lamp has been improved, display device's display effect has been improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. The shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the present disclosure.
FIG. 1 is a schematic top view of a backlight module in the prior art;
fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure;
fig. 3 is a schematic top view of a backlight module according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another backlight module according to an embodiment of the present disclosure;
fig. 5 is a schematic top view illustrating another backlight module according to an embodiment of the present disclosure;
fig. 6 is a schematic top view illustrating another backlight module according to an embodiment of the present disclosure;
fig. 7 is a schematic top view illustrating another backlight module according to an embodiment of the present disclosure;
fig. 8 is a schematic top view illustrating another backlight module according to an embodiment of the present disclosure;
fig. 9 is a schematic top view illustrating another backlight module according to an embodiment of the present disclosure;
fig. 10 is a schematic top view illustrating another backlight module according to an embodiment of the present disclosure;
fig. 11 is a schematic structural diagram of another backlight module according to an embodiment of the present disclosure;
fig. 12 is a schematic top view illustrating another backlight module according to an embodiment of the present disclosure;
fig. 13 is a schematic structural diagram of another backlight module according to an embodiment of the present application.
Detailed Description
In order to make the purpose, technical solutions and advantages of the present application clearer, specific embodiments of a display device provided in an embodiment of the present application are described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are for purposes of illustration and explanation only and are not intended to limit the present application. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be understood that the terms first, second, etc. in the description of the embodiments of the present application are used for distinguishing between the descriptions and not for indicating or implying relative importance or order. In the description of the embodiments of the present application, "a plurality" means two or more.
The term "and/or" in the embodiment of the present application is only one kind of association relationship describing an associated object, and means that three kinds of relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Along with the development of science and technology and the improvement of user to product experience requirement, in current display product market, mostly use the high luminance, high colour gamut, the high resolution that pursue the display screen to show for the main, this must be to display panel, liquid crystal module, backlight unit's display requirement is higher and higher. In the backlight module technology, there are two technologies, namely an edge-light type backlight structure and a direct type backlight structure, and under the trend of thinning the display panel, the edge-light type backlight structure can reduce the thickness of the backlight module, which is the focus of the current research.
In a conventional edge-light type backlight module, a plurality of LEDs are usually disposed at intervals on a side of a light guide plate to form an LED light bar. The light emitted by the LED lamp strip is incident from the light incident surface of the light guide plate and is totally reflected in the light guide plate, and the mesh points arranged on the light emergent surface of the light guide plate destroy the total reflection of the light in the light guide plate, so that the light is uniformly emitted from the light emergent surface of the light guide plate, and the light is converted into a surface light source from a point light source.
As shown in fig. 1, a single LED is a point light emitter, and its light emitting state is fan-shaped emission, and generally, the light emitting luminance at the center is the largest.
In order to ensure uniform brightness in the light guide plate, the light exit surface needs to be disposed at a position behind the light entrance surface of the light guide plate by a predetermined length, so as to ensure uniform brightness of the light emitted from the light exit surface. The distance from the light emitting surface of the LED lamp to the light incident surface of the light guide plate is the light mixing distance. However, with the increasing screen occupation ratio of electronic devices, the light mixing distance has to be reduced in order to realize narrow bezel installation. When the light mixing distance L is smaller, the dark space S between the LED lamps can be highlighted, so that the light guide plate has an obvious dark and bright alternative phenomenon at a position close to the backlight source, namely, the display device has a phenomenon of uneven brightness in front of the lamps, and the whole display effect of the display device is influenced.
In order to solve the problem of uneven brightness in front of a lamp of a display device in the prior art and improve the display effect of the display device, the embodiment of the application provides a backlight module and the display device.
Referring to fig. 2, the backlight module provided in the embodiment of the present application includes a frame 21 and an optical member 22; the frame 21 includes a bottom plate 211 and a side plate 212 located around the bottom plate 211, the bottom plate 211 and the side plate 212 form an accommodating space, and the optical component 22 is located in the accommodating space.
The optical member 22 includes a light guide plate 221 and a backlight 222 disposed at one side of the light guide plate 221. The top surface of the light guide plate 221 is a light emitting surface and is located on one side far away from the bottom plate 211; the side surface of the light guide plate 221 is a light incident surface, and is disposed adjacent to the light emitting surface of the backlight 222, and the light emitting surface of the backlight 222 intersects with the plane where the light guide plate 221 is located.
The backlight 222 shown in fig. 2 is mounted in a flip-chip configuration, that is, a Flexible Printed Circuit board (FPC) 223 of the backlight 222 is disposed on a side of the backlight 222 close to the bottom plate 211. The FPC223 of the backlight 222 may be fixed to the chassis 211 by a double-sided tape 224 on a side away from the backlight 222. When the backlight source 222 is mounted in an inverted structure, the space between the first region C1 and the backlight source 222 can be just used for arranging the FPC223 for the LED, so that the utilization rate of the accommodating space in the frame 21 can be effectively improved, and the thickness of the display device can be reduced.
Of course, the backlight 222 may be mounted in a front-mount configuration, that is, the FPC223 of the backlight 222 may be disposed on the side of the backlight 222 away from the chassis 211. When the backlight 222 is installed in a front-loading structure, the space between the backlight 222 and the chassis 211 may be filled by increasing the thickness of the chassis 211 at the portion of the first region C1, disposing other components between the backlight 222 and the chassis 211, and the like. For example, the thickness of the double-sided tape 224 may be increased, or other glue may be filled, etc.
With reference to fig. 2, one surface of the bottom plate 211 facing the accommodating space includes a first region C1, a second region C2, and a third region C3 sequentially distributed along the first direction. The first direction is a light exit direction of the backlight 222, the first region C1 is located on one side of the backlight 222 and the light guide plate 221, which is close to the bottom plate 211, and the second region C2 and the third region C3 are located on one side of the light guide plate 221, which is close to the bottom plate 211. Fig. 3 is a top view of the backlight module shown in fig. 2, and as shown in fig. 3, the boundary of the second region C2 close to the side of the backlight source 222 connects with the first region C1, and the boundary of the second region C2 far from the side of the backlight source 222 connects with the third region C3. The backlight 222 includes a plurality of LEDs spaced apart along a second direction, wherein the second direction is perpendicular to the first direction.
It should be noted that, in order to clearly illustrate the structure of the backlight module, only a small number of LEDs are illustrated in fig. 2 and fig. 3, and in a specific implementation process, the number of LEDs may be more, which is not limited in this embodiment of the present application. In addition, the shape and size proportional relationship of the first region C1 and the second region C2 and the third region C3 is not limited to the shape and size proportional relationship shown in fig. 2 and 3.
As shown in fig. 2, the plane of the first region C1 and the plane of the third region C3 are both parallel to the light guide plate 221, the relative distance d1 between the plane of the first region C1 and the light guide plate 221 is greater than the relative distance d2 between the plane of the third region C3 and the light guide plate 221, the second region C2 is a slope with respect to the light guide plate 221, and the second region C2 can receive a portion of the light emitted from the backlight 222. The second region C2 further has a reflective layer 212 disposed thereon, and the reflective layer 212 can reflect the received light back into the light guide plate 221.
In a specific implementation, the inclination angles of the respective positions on the second region C2 with respect to the light guide plate 221 may be the same or different, and the application is not particularly limited.
For example, fig. 2 is a schematic diagram illustrating that the positions on the second region C2 have the same inclination angle with respect to the light guide plate 221, that is, the plane on which the second region C2 is located is an inclined plane with respect to the light guide plate 221. When the plane of the second region C2 is an inclined plane relative to the light guide plate 221, an included angle between the plane of the second region C2 and the planes of the first region C1 and the third region C3 may be any value between 120 ° and 165 °, such as 135 ° and 145 °, and the embodiment of the present application is not limited specifically. This way, the first region C1 can smoothly transit to the third region C3 through the second region C2, which can reduce the difficulty of the process.
For example, fig. 4 is a schematic diagram illustrating a possible case where two positions on the second region C2 have different tilt angles with respect to the light guide plate 221, and in fig. 4, the tilt angle of the end of the second region C2 close to the backlight 222 is smaller than the tilt angle of the end far from the backlight 222. Of course, the above are only examples of the inclination manner of the second region C2, and in a specific implementation, the specific inclination manner of the second region C2 may also have other implementations, for example, there may be more different inclination angles with respect to the light guide plate 221, and the embodiment of the present application is not limited. Therefore, the inclination angles of different positions on the second region C2 can be designed according to actual requirements, so as to more accurately control the reflection effect of the second region C2 on light (for example, the size of the reflection direction of light, the amount of reflected light, and the like of each position), and better improve the display effect of the display device.
In the above scheme, the reflective layer 212 is disposed in the second area C2 on the bottom plate 211, and the reflective layer 212 can reflect the light received from the backlight 222 back to the light guide plate 221, so as to compensate the brightness of the dark image area in the light front display area of the light guide plate 221, improve the problem of uneven brightness of the display device in front of the light, and improve the overall display effect of the display device.
Optionally, the frame body 21 may be made of an iron frame and a rubber frame located on the inner side wall of the iron frame, and the iron frame and the rubber frame may be of an integral structure. Adopt gluey frame body structure as an organic whole, can effectively reduce the thickness of framework 21.
Optionally, any two adjacent LEDs have corresponding first and second positions on the second region C2; the projection of the first position on the plane where the light guide plate 221 is located on a midperpendicular of a central connecting line of two projections of any two adjacent LEDs on the plane where the light guide plate 221 is located; a line connecting the projection of the second position on the plane where the light guide plate 221 is located and the center of the projection of one of any two adjacent LEDs on the plane where the light guide plate 221 is located is parallel to the perpendicular bisector; the reflectivity at the first location is greater than the reflectivity at the second location.
For example, fig. 5 is a top view of the backlight module, fig. 6 is a projection view of LEDs on the backlight 222, the first region C1, the second region C2, and the third region C3 on the plane where the light guide plate 221 is located on the bottom plate 211, where 222 'represents a projection of the LEDs in the backlight 222 on the plane where the light guide plate 221 is located, K1' represents a projection of the first position K1 on the plane where the light guide plate 221 is located, K2 'represents a projection of the second position K2 on the plane where the light guide plate 221 is located, C1' represents a projection of the first region C1 on the plane where the light guide plate 221 is located, C2 'represents a projection of the second region C2 on the plane where the light guide plate 221 is located, and C3' represents a projection of the third region C3 on the plane where the light guide plate 221 is located.
As shown in fig. 5 and 6, a projection K1 'of the first position K1 on the plane of the light guide plate 221 is located on a perpendicular bisector of a connecting line of centers of two projections of two adjacent LEDs on the plane of the light guide plate 221, and a connecting line of a projection K2' of the second position K2 on the plane of the light guide plate 221 and a center of a projection of one of the two adjacent LEDs on the plane of the light guide plate 221 is parallel to the perpendicular bisector. The reflectivity at the first position K1 is greater than the reflectivity at the second position K2, so that the darkest position in the display area before the lamp of the light guide plate 221 receives more compensating light from the reflective layer than the brightest position in the display area before the lamp, thereby improving the uneven brightness in front of the lamp.
It should be noted that fig. 5 and 6 only show the first position and the second position corresponding to some LEDs in the backlight 222, and for the case of other LEDs, reference may be made to the already shown LEDs, and the embodiments of the present application are not illustrated.
In a specific implementation, the reflectivity at the first position and the reflectivity at the second position may be determined according to the illumination condition of the front display area of the light guide plate 221, and the embodiment of the present application is not particularly limited. In order to better improve the problem of uneven brightness in front of the display area, the reflectivity at the first position and the reflectivity at the second position may be different greatly, for example, one possible embodiment is that the reflectivity at the first position is greater than or equal to 80% (i.e., the ratio of the amount of light reflected to the light guide plate 221 to the amount of received light is greater than or equal to 80%), and the reflectivity at the second position is less than or equal to 5% (i.e., the ratio of the amount of light reflected to the light guide plate 221 to the amount of received light is less than or equal to 5%).
This embodiment can guarantee that the darkest position in the display area before the light guide plate 221 lamp can receive more compensation light from the reflector layer, and the brightest position in the display area before the light guide plate 221 lamp can receive less compensation light from the reflector layer, and then improve the uneven problem of brightness before the lamp of display device.
Alternatively, the reflectance at the second area C2 decreases from the first position to the second position in the second direction.
As shown in fig. 7, the second area C2 in fig. 7 has a lower reflectivity where the filling color is darker, as can be seen from fig. 7: the reflectivity is highest at the first position K1 and lowest at the second position K2, and gradually decreases from the first position K1 to the second position K2.
In the embodiment, the amount of light received by the reflective layer 212 at each position of the display area in front of the light guide plate 221 is inversely proportional to the brightness at that position, that is, the darker the position can receive more compensating light from the reflective layer 212, so that the uniformity of the display brightness of the display area is further improved, and the display effect of the display device is better improved.
Optionally, the second region C2 includes a plurality of sub-regions alternately arranged along the second direction, the reflectivity at each position in the same sub-region is the same, and the reflectivity in different sub-regions is different; the reflectivity of the sub-area being closer to the first position is lower and the reflectivity of the sub-area being closer to the second position is higher.
In practice, there may be a plurality of sub-regions alternately arranged on the second region C2, and two possible embodiments thereof will be described in detail below.
(1) There are two types of sub-regions that are alternately arranged.
Referring to fig. 8, the second region C2 includes first sub-regions C2a and second sub-regions C2b alternately arranged along the second direction; the first position K1 is located in the first subregion C2a, the second position K2 is located in the second subregion C2 b; the reflectivity at each position on the first sub-area C2a is a first preset value x 1; the reflectivity at each position on the second sub-area C2b is a second preset value x2, x1> x 2.
In a specific implementation, the first sub-region C2a and the second sub-region C2b may or may not be mutually engaged as shown in fig. 8, which is not specifically limited in the embodiment of the present application. As shown in fig. 9, in order to illustrate that the first sub-region C2a and the second sub-region C2b are not connected to each other, the reflective layer 212 may not be disposed in the space between the first sub-region C2a and the second sub-region C2 b.
(2) There are three types of sub-regions that are alternately arranged.
Referring to fig. 10, the second region C2 includes first sub-regions C2a, second sub-regions C2b and third sub-regions C2C alternately arranged along the second direction; the first position K1 is located in the first sub-region C2a, the second position K2 is located in the second sub-region C2b, and the third sub-region C2C is located between the first sub-region C2a and the second sub-region C2 b; the reflectivity on the first sub-area C2a is y1, the reflectivity on the second sub-area C2b is y2, and the reflectivity on the third sub-area C2C is y3, y1> y3> y 2.
Certainly, in specific implementation, there may be more sub-regions, which are only examples of some possible sub-regions, and the sub-regions may not be specifically limited in the embodiment of the present application.
In the embodiment, the first area C2 is divided into a plurality of sub-areas arranged alternately along the second direction, so that the reflectivity at each position in the same sub-area is the same, the reflectivity in different sub-areas is different, and the reflectivity of the sub-area closer to the first position K1 is lower, and the reflectivity of the sub-area closer to the second position K2 is higher, so that the dark area in front of the lamp can obtain more reflected light from the reflective layer 212, and the bright area in front of the lamp can obtain less reflected light from the reflective layer 212, thereby improving the uniformity of the display brightness of the display area and improving the display effect of the display device.
Alternatively, referring to fig. 11 and 12, the light guide plate 221 includes a display area AA and a non-display area except the display area, and a projection of the second area C2 on a plane where the light guide plate 221 is located in the display area.
The distance a between the boundary of the display region close to the side of the backlight 222 and the light exit position of the backlight 222 is greater than 1 mm; the ratio A/P of A to the center-to-center distance P between every two adjacent LEDs is greater than 0.4.
The distance L1 between the boundary of the second region C2 close to the side of the backlight 222 and the light-emitting surface of the backlight 222 is 1-5 mm;
by the embodiment, the light reflected by the reflecting layer 212 can be ensured to accurately reach the display area in front of the lamp of the light guide plate 221, and the problem of uneven brightness in front of the lamp of the display device can be better solved.
Alternatively, the reflective layer 223 may be disposed by pasting a reflective strip on the second area C2, spraying a reflective material on the second area C2, and the like, which is not limited in this embodiment of the application. The reflective layer 223 may be made of silver, ink, or the like, which is not limited in this embodiment.
For example, white ink may be applied at locations of high reflectivity (e.g., the first location K1) and black or gray ink may be applied at locations of low reflectivity (e.g., the second location K2).
The reflective layer 223 is provided in this embodiment mode, which is simple in process and low in cost.
Optionally, referring to fig. 13, the optical component 22 further includes:
a reflective sheet 224 located on a side of the light exit surface facing away from the light guide plate 221;
a diffusion sheet 227 located on one side of the light exit surface of the light guide plate 221, a lower brightness enhancement sheet 226 located on one side of the diffusion sheet 227 departing from the light exit surface, and an upper brightness enhancement sheet 225 located on one side of the lower brightness enhancement sheet 226 departing from the diffusion sheet.
Based on the same technical concept, an embodiment of the present application further provides a display device, including: the backlight module according to the embodiment of the present application, and the display panel disposed on the light-emitting surface of the backlight module.
It should be noted that other essential components of the display device are understood by those skilled in the art, and are not described herein nor should they be taken as limitations of the present application.
Based on the same technical concept, the embodiment of the present application further provides a method for manufacturing a backlight module, which is characterized by comprising:
providing a frame body; the frame body comprises a bottom plate and a side plate positioned on the periphery of the bottom plate, and the bottom plate and the side plate form an accommodating space for accommodating an optical component; one surface of the bottom plate facing the accommodating space comprises a first area, a second area and a third area;
disposing a reflective layer on the second region;
arranging an optical component in the accommodating space; the optical component comprises a light guide plate and a backlight source arranged on one side of the light guide plate; the backlight comprises a plurality of LEDs; the top surface of the light guide plate is a light emergent surface and is positioned on one side far away from the bottom plate, the side surface of the light guide plate is a light incident surface and is arranged adjacent to the light emergent surface of the backlight source, and the light emergent surface of the backlight source is intersected with the plane where the light guide plate is positioned; the first area is positioned on one side of the backlight source and the light guide plate close to the bottom plate, and the second area and the third area are positioned on one side of the light guide plate close to the bottom plate; the plane where the first area is located and the plane where the third area is located are both parallel to the plane where the light guide plate is located, and the relative distance between the plane where the first area is located and the light guide plate is larger than the relative distance between the plane where the third area is located and the light guide plate; the boundary of the second area close to one side of the backlight source is jointed with the first area, and the boundary of the second area far away from one side of the backlight source is jointed with the third area.
According to the embodiment of the application, the reflection layer is arranged in the second area on the bottom plate, and can reflect the light received from the backlight source back to the light guide plate, so that the brightness of a dark image area in a display area in front of a light of the light guide plate is compensated, the problem of uneven brightness of the light of the display device in front of the light is solved, and the whole display effect of the display device is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (15)
1. A backlight module is characterized by comprising a frame body and an optical component;
the frame body comprises a bottom plate and a side plate positioned on the periphery of the bottom plate, the bottom plate and the side plate form an accommodating space, and the optical component is positioned in the accommodating space;
the optical component comprises a light guide plate and a backlight source arranged on one side of the light guide plate; the top surface of the light guide plate is a light-emitting surface and is positioned on one side far away from the bottom plate; the side surface of the light guide plate is a light incident surface and is arranged adjacent to the light emergent surface of the backlight source, and the light emergent surface of the backlight source is intersected with the plane of the light guide plate;
one surface of the bottom plate facing the accommodating space comprises a first area, a second area and a third area which are sequentially distributed along a first direction; the first direction is the light-emitting direction of the backlight source, the first area is located on one side, close to the bottom plate, of the backlight source and the light guide plate, and the second area and the third area are located on one side, close to the bottom plate, of the light guide plate; the plane where the first area is located and the plane where the third area is located are both parallel to the plane where the light guide plate is located, and the relative distance between the plane where the first area is located and the light guide plate is larger than the relative distance between the plane where the third area is located and the light guide plate; the boundary of one side, close to the backlight source, of the second area is connected with the first area, and the boundary of one side, far away from the backlight source, of the second area is connected with the third area;
the backlight source comprises a plurality of LEDs, and a reflecting layer is arranged on the second area;
wherein any two adjacent LEDs have corresponding first and second positions on the second region;
the projection of the first position on the plane of the light guide plate is positioned on a midperpendicular of a central connecting line of two projections of any two adjacent LEDs on the plane of the light guide plate;
a connecting line of the projection of the second position on the plane where the light guide plate is located and the center of the projection of one LED of the any two adjacent LEDs on the plane where the light guide plate is located is parallel to the perpendicular bisector;
the reflectivity at the first location is greater than the reflectivity at the second location.
2. The backlight module as claimed in claim 1, wherein the second region is disposed on a plane inclined with respect to the light guide plate.
3. The backlight module of claim 1, wherein the reflectivity at the first position is greater than or equal to 80%.
4. The backlight module of claim 1, wherein the reflectivity at the second position is less than or equal to 5%.
5. The backlight module of claim 1, wherein the reflectivity on the second area decreases from the first location to the second location.
6. The backlight module according to claim 1, wherein the second region comprises a first sub-region and a second sub-region alternately arranged along a second direction, and the second direction is perpendicular to the first direction;
the first location is located in the first sub-region and the second location is located in the second sub-region;
the reflectivity over the first sub-area is less than the reflectivity over the second sub-area.
7. The backlight module according to claim 6, wherein the reflectivity at each position of the first sub-region is a first preset value; and the reflectivity at each position on the second sub-area is a second preset value.
8. The backlight module according to any of claims 1-7, wherein the reflective layer is a reflective strip adhered to the second region or a reflective material sprayed on the second region.
9. The backlight module according to any one of claims 1 to 7, wherein the reflective layer is made of silver and/or ink.
10. The backlight module according to any of claims 1-7, wherein the angle between the plane of the second region and the planes of the first region and the third region is 135-165 °.
11. The backlight module according to any of claims 1 to 7, wherein the light guide plate comprises a display region and a non-display region except the display region; the projection of the second area on the plane where the light guide plate is located in the display area.
12. The backlight module as claimed in claim 11, wherein a distance a between a boundary of the display region on a side close to the backlight source and a light exit position of the backlight source is greater than 1 mm;
the ratio A/P of the A to the center-to-center distance P between every two adjacent LEDs is more than 0.4.
13. The backlight module as claimed in claim 12, wherein a distance L1 between a boundary of the second region on a side close to the backlight source and a light exit position of the backlight source is 1-5 mm.
14. The backlight module according to any one of claims 1 to 7, wherein the optical member further comprises:
the reflecting sheet is positioned on one side of the light emergent surface which is far away from the light guide plate;
the light guide plate comprises a diffusion sheet, a lower brightness enhancement sheet and an upper brightness enhancement sheet, wherein the diffusion sheet is positioned on one side of a light emitting surface of the light guide plate, the lower brightness enhancement sheet is positioned on one side of the diffusion sheet, which is far away from the light emitting surface, and the upper brightness enhancement sheet is positioned on one side of the lower brightness enhancement sheet, which is far away from the diffusion sheet.
15. A display device, comprising:
the backlight module as claimed in any one of claims 1-14, and a display panel disposed above the light-emitting surface of the backlight module.
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| CN201910462746.7A CN110196512B (en) | 2019-05-30 | 2019-05-30 | Backlight module and display device |
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| CN201910462746.7A CN110196512B (en) | 2019-05-30 | 2019-05-30 | Backlight module and display device |
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| CN110196512B true CN110196512B (en) | 2022-02-01 |
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| CN110675741B (en) * | 2019-09-29 | 2021-10-08 | 厦门天马微电子有限公司 | Backlight module and display device |
| CN113129759B (en) * | 2021-04-28 | 2022-12-09 | 厦门天马微电子有限公司 | Display module assembly and display device |
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| US6074070A (en) * | 1996-07-29 | 2000-06-13 | Enplas Corporation | Surface light source device of side light type |
| CN101676769A (en) * | 2008-09-18 | 2010-03-24 | 株式会社日立制作所 | Liquid crystal display unit |
| CN107656397A (en) * | 2017-09-29 | 2018-02-02 | 厦门天马微电子有限公司 | A kind of display device |
| CN107870484A (en) * | 2017-11-07 | 2018-04-03 | 业成科技（成都）有限公司 | Liquid crystal display device and its side light type backlight module |
| CN207424456U (en) * | 2017-10-09 | 2018-05-29 | 深圳市赛时达光电科技有限公司 | Backlight module and display device |
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| US6074070A (en) * | 1996-07-29 | 2000-06-13 | Enplas Corporation | Surface light source device of side light type |
| CN101676769A (en) * | 2008-09-18 | 2010-03-24 | 株式会社日立制作所 | Liquid crystal display unit |
| CN107656397A (en) * | 2017-09-29 | 2018-02-02 | 厦门天马微电子有限公司 | A kind of display device |
| CN207424456U (en) * | 2017-10-09 | 2018-05-29 | 深圳市赛时达光电科技有限公司 | Backlight module and display device |
| CN107870484A (en) * | 2017-11-07 | 2018-04-03 | 业成科技（成都）有限公司 | Liquid crystal display device and its side light type backlight module |
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| CN110196512A (en) | 2019-09-03 |
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