CN109491146B - Light-emitting module and manufacturing method thereof, direct type backlight module and display device - Google Patents
Light-emitting module and manufacturing method thereof, direct type backlight module and display device Download PDFInfo
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- CN109491146B CN109491146B CN201910037501.XA CN201910037501A CN109491146B CN 109491146 B CN109491146 B CN 109491146B CN 201910037501 A CN201910037501 A CN 201910037501A CN 109491146 B CN109491146 B CN 109491146B
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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
- G02F1/133603—Direct backlight with LEDs
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Abstract
The invention discloses a light-emitting module, a manufacturing method thereof, a direct type backlight module and a display device, and belongs to the technical field of display. The method comprises the following steps: a base substrate having opposing first and second sides; the linear light bars are arranged on the substrate and provided with a first symmetrical axis and a second symmetrical axis which are perpendicular to each other, the first symmetrical axis and the second symmetrical axis define a plurality of lighting areas on the substrate, and the arrangement directions of the first edge and the second edge are parallel to the first symmetrical axis; at least one linear light bar is arranged in each lighting area, each linear light bar is provided with a first end and a second end, the first ends are close to the first symmetrical axis relative to the second ends, and the first ends are close to the second symmetrical axis relative to the second ends. According to the invention, the distance between the linear light bar in the illumination area and the four corners of the substrate base plate is reduced, so that the light-emitting uniformity of the light-emitting module is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a light-emitting module and a manufacturing method thereof, a direct type backlight module and a display device.
Background
A Liquid Crystal Display (LCD) includes a Liquid Crystal Display panel and a backlight (Back Light) disposed at a Back surface of the Liquid Crystal Display panel, where the backlight is divided into a direct type backlight and a side type backlight. The direct type backlight source comprises a light emitting module, and diffusion sheets, prism film layers and other optical films which are stacked in the direction far away from the light emitting module.
In related art, a direct-type backlight source generally includes a substrate and a plurality of light bars disposed on the substrate, wherein the plurality of light bars are disposed in parallel. Wherein, every lamp strip includes: the Light-Emitting Diode (LED) Light-Emitting display panel comprises a linear Printed Circuit Board (PCB) and a plurality of Light-Emitting diodes (LEDs) which are arranged on the linear PCB in an array mode, the distance between any two adjacent LEDs is equal, and Light rays emitted by the Light bars are transmitted through an optical film material and then emitted to the liquid crystal display panel.
However, the LEDs in the light emitting module are point light sources, and can emit light in all directions, and the light intensity of the light attenuates with the increase of the optical path in the transmission process. Supposing that the corner area of the optical film is a first area, the area except the corner area in the optical film is a second area, and the distance between the LED in the lamp strip and the first area of the optical film is smaller than the distance between the LED in the lamp strip and the second area of the optical film, so that the light intensity when the light emitted by the LED reaches the first area is smaller than the light intensity when the light reaches the second area, and further the brightness of the first area of the optical film is obviously smaller than that of the second area, thus leading to poor light-emitting uniformity of the direct type backlight source.
Disclosure of Invention
The embodiment of the invention provides a light-emitting module, a manufacturing method thereof, a direct type backlight module and a display device, which can solve the problem of poor uniformity of light emitted by a direct type backlight source in the related art. The technical scheme is as follows:
in a first aspect, a light emitting module is provided, which includes:
a base substrate having opposing first and second sides;
the linear light bars are arranged on the substrate base plate, the linear light bars are provided with a first symmetrical axis and a second symmetrical axis which are perpendicular to each other, the first symmetrical axis and the second symmetrical axis define a plurality of lighting areas on the substrate base plate, and the arrangement direction of the first edge and the second edge is parallel to the first symmetrical axis;
wherein at least one linear light bar is disposed in each of the lighting areas, the linear light bar having a first end and a second end, the first end being proximate to the first axis of symmetry relative to the second end, and the first end being proximate to the second axis of symmetry relative to the second end.
Optionally, a plurality of linear light bars arranged in an array along an extending direction parallel to the first symmetry axis are arranged in each lighting area.
Optionally, a plurality of linear light bars arranged in an extending direction parallel to the first symmetry axis are arranged in each lighting area, and each linear light bar comprises a first linear light bar and a second linear light bar;
the inclination degree of the first linear light bar relative to the second symmetry axis is smaller than the inclination degree of the second linear light bar relative to the second symmetry axis, and the distance between the first linear light bar and the second symmetry axis is smaller than the distance between the second linear light bar and the second symmetry axis.
Optionally, the plurality of linear light bars include at least one linear light bar located at the position of the second symmetry axis.
In a second aspect, a method for manufacturing a light emitting module is provided, the method comprising:
providing a base substrate having first and second opposing edges;
arranging a plurality of linear light bars on the substrate, wherein the linear light bars are provided with a first symmetrical axis and a second symmetrical axis which are perpendicular to each other, the first symmetrical axis and the second symmetrical axis define a plurality of lighting areas on the substrate, and the arrangement directions of the first edge and the second edge are parallel to the first symmetrical axis;
wherein at least one linear light bar is disposed in each of the lighting areas, the linear light bar having a first end and a second end, the first end being proximate to the first axis of symmetry relative to the second end, and the first end being proximate to the second axis of symmetry relative to the second end.
Optionally, set up a plurality of straight line shape lamp strips on the substrate base plate, include:
disposing at least one linear light bar parallel to the second axis of symmetry within the lighting area, the linear light bar having a first end and a second end, the first end being proximate the first axis of symmetry relative to the second end;
and moving the second end of the linear light bar towards the direction far away from the second symmetry axis, so that the second end is far away from the second symmetry axis relative to the first end.
Optionally, set up a plurality of straight line shape lamp strips on the substrate base plate, include:
and at least one linear light bar is arranged at the position of the second symmetrical shaft.
In a third aspect, a direct type backlight module is provided, comprising: the light-emitting module comprises an optical film and the light-emitting module according to any one of the first aspect, wherein the optical film is positioned on the light-emitting side of the light-emitting module.
Optionally, the direct type backlight module further includes: the backboard coats the other sides of the light-emitting module except the light-emitting side;
and the substrate base plate of the light-emitting module is multiplexed with the backboard.
In a fourth aspect, there is provided a display device comprising: the direct type backlight module according to the third aspect.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the linear light bars arranged in the light-emitting module are provided with the first symmetrical axis and the second symmetrical axis which are perpendicular to each other, and the first ends of the linear light bars are close to the first symmetrical axis relative to the second ends and close to the second symmetrical axis relative to the second ends, so that compared with the light-emitting module shown in the figure 1, the distance between the linear light bars in the illumination area and four corners of the substrate is reduced, the light intensity of light rays emitted by light-emitting units on the light bars reaching corner areas of the optical film material can be increased, the brightness of the corner areas of the optical film material is improved, and the light-emitting uniformity of the light-emitting module is improved; compared with the light emitting module shown in fig. 2, because the light bars adopted in the embodiment of the invention are all linear light bars, the cutting utilization rate of the PCB can be improved, and the preparation cost of the light emitting module is further reduced.
Drawings
Fig. 1 is a schematic structural diagram of a light emitting module provided in the related art;
FIG. 2 is a schematic view of another light-emitting module provided in the related art;
fig. 3 is a schematic structural diagram of a light emitting module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another light emitting module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another light emitting module according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another light emitting module according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another light emitting module according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a direct-type backlight module according to an embodiment of the present invention;
fig. 9 is a flowchart of a method for manufacturing a light emitting module according to an embodiment of the invention;
fig. 10 is a schematic diagram of a light exit surface of a direct type backlight module according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of a light emitting module provided in the related art, as shown in fig. 1, the light emitting module includes a plurality of light bars 10, and the light bars 10 are arranged in parallel. For example, referring to fig. 1, the lighting module may include 3 light bars, and each light bar 10 includes: the linear PCB101 and the plurality of LEDs 102 arrayed on the linear PCB101, light emitted from the light bar 10 is transmitted through an optical film (not shown) and then emitted to a liquid crystal display panel (not shown). The LED is a point light source and can emit light rays to all directions, and the light intensity of the light rays is attenuated along with the increase of the optical path in the transmission process. Supposing that the corner area of the optical film is a first area, the area except the corner area in the optical film is a second area, and the distance between the LED in the lamp strip and the first area of the optical film is smaller than the distance between the LED in the lamp strip and the second area of the optical film, so that the light intensity when the light emitted by the LED reaches the first area is smaller than the light intensity when the light reaches the second area, and further the brightness of the first area of the optical film is obviously smaller than that of the second area, thus leading to poor light-emitting uniformity of the direct type backlight source.
Further, in order to improve the brightness of the corner area of the optical film in the related art, another light emitting module is provided, as shown in fig. 2, the light emitting module includes a plurality of shaped light bars 20, and each shaped light bar 20 includes: a shaped PCB201 and a plurality of LEDs 202 arrayed on the shaped PCB 201. As can be seen from comparing fig. 1 and 2, the LEDs disposed at both ends of the special-shaped PCB in fig. 2 have a reduced distance from the corner regions of the optical film material compared to the LEDs disposed at both ends of the linear PCB in fig. 1, and thus, the brightness of the corner regions of the optical film material can be improved. However, the cutting utilization rate of the special-shaped PCB provided in the related art is low, which results in high manufacturing cost of the light bar.
The embodiment of the invention provides a light-emitting module, which can solve the problems in the related art. Optionally, fig. 3 is a schematic structural diagram of a light emitting module according to an embodiment of the present invention, and as shown in fig. 3, the light emitting module includes: the lamp comprises a substrate base plate 301 and a plurality of linear light bars 302 arranged on the substrate base plate 301. The linear light bar comprises a linear PCB and a plurality of light emitting units arranged on the linear PCB.
Optionally, the preparation material of the linear PCB may be aluminum or glass fiber epoxy resin, and the like, which is not limited in the embodiment of the present invention.
The base substrate 301 has opposite first and second sides L1 and L2.
Alternatively, the substrate base plate may be a rectangular substrate base plate, and then the opposite first side and second side of the substrate base plate are parallel.
The plurality of linear light bars 302 have a first symmetry axis x and a second symmetry axis y perpendicular to each other, the first symmetry axis x and the second symmetry axis y define a plurality of illumination areas k on the substrate base plate 301, and the arrangement direction of the first side L1 and the second side L2 is parallel to the first symmetry axis x.
At least one linear light bar 302 is disposed in each illumination area k, the linear light bar 302 has a first end 302a and a second end 302b, the first end 302a is close to the first symmetry axis x relative to the second end 302b, and the first end 302a is close to the second symmetry axis y relative to the second end 302 b.
Optionally, a distance between a first end of a straight-line light bar in the lighting area and the second symmetry axis is a first distance, a distance between a second end of the straight-line light bar and the second symmetry axis is a second distance, and a difference between the second distance and the first distance is in a range of 5 to 20 millimeters, for example, 5 millimeters, 10 millimeters, or 20 millimeters, which is not limited in the embodiment of the present invention.
Referring to fig. 3, because the plurality of linear light bars in the light-emitting module have the first symmetry axis x and the second symmetry axis y that are perpendicular to each other, and the included angle between each linear light bar 302 and the first symmetry axis x and the second symmetry axis y in the illumination region k where each linear light bar is located is an acute angle, two linear light bars symmetrically arranged according to the first symmetry axis are V-shaped, and the openings of the two linear light bars arranged in the V-shape are opposite to the second symmetry axis; in addition, two linear lamp strips symmetrically arranged according to the second symmetry axis are V-shaped, and the openings of the two linear lamp strips arranged in the V shape are back to the first symmetry axis.
Optionally, the light emitting module provided in the embodiment of the present invention may be applied to a direct type backlight module, the direct type backlight module further includes an optical film material, the optical film material is located on a light exit side of the light emitting module, and light emitted from a linear light bar in the light emitting module is transmitted through the optical film material and then exits.
In summary, in the light emitting module provided in the embodiment of the present invention, the plurality of linear light bars in the light emitting module have the first symmetric axis and the second symmetric axis that are perpendicular to each other, and since the first ends of the linear light bars are close to the first symmetric axis relative to the second ends and the first ends are close to the second symmetric axis relative to the second ends, compared with the light emitting module shown in fig. 1, the distance between the linear light bars in the illumination area and the four corners of the substrate is reduced, so that the light intensity of the light emitted by the light emitting units on the light bars reaching the corner area of the optical film material can be increased, the brightness of the corner area of the optical film material is improved, and the light emitting uniformity of the light emitting module is improved; compared with the light emitting module shown in fig. 2, because the light bars adopted in the embodiment of the invention are all linear light bars, the cutting utilization rate of the PCB can be improved, and the preparation cost of the light emitting module is further reduced.
Alternatively, a plurality of linear light bars arranged in an extension direction parallel to the first axis of symmetry may be provided in each lighting area. The linear light bars in the lighting area can be arrayed along the extending direction parallel to the first symmetry axis, namely the inclination degrees of the linear light bars relative to the second symmetry axis are the same; alternatively, the inclination degrees of the plurality of linear light bars in the lighting area with respect to the second symmetry axis may also be different, which is not limited in the embodiment of the present invention.
For example, fig. 4 is a schematic structural view of another light emitting module according to an embodiment of the present invention, and as shown in fig. 4, a plurality of linear light bars 302 arranged in an array along an extending direction parallel to the first symmetry axis x are disposed in each illumination region k.
For example, fig. 5 is a schematic structural diagram of another light emitting module according to an embodiment of the present invention, and as shown in fig. 5, a plurality of linear light bars 302 arranged along an extending direction parallel to the first symmetry axis x are disposed in each illumination area k. The plurality of linear light bars 302 include a first linear light bar 302A and a second linear light bar 302B, the inclination of the first linear light bar 302A relative to the second axis of symmetry y is less than the inclination of the second linear light bar 302B relative to the second axis of symmetry y, and the distance between the first linear light bar 302A and the second axis of symmetry y is less than the distance between the second linear light bar 302B and the second axis of symmetry y.
Optionally, each lighting area may further include a linear light bar parallel to the second symmetry axis, or all the linear light bars in each lighting area are obliquely disposed with respect to the second symmetry axis, which is not limited in the embodiment of the present invention.
Optionally, the plurality of linear light bars in the light emitting module include at least one linear light bar located at the position of the second symmetry axis.
Optionally, at least one linear light bar located at the second symmetric axis includes a longer linear light bar, or at least one linear light bar located at the second symmetric axis includes two or more shorter linear light bars.
For example, referring to fig. 6 and 7, the plurality of linear light bars in the light emitting module includes at least one linear light bar 302C located at the position of the second axis of symmetry y.
In the embodiment of the present invention, since the plurality of linear light bars in the light emitting module have the first symmetric axis and the second symmetric axis that are perpendicular to each other, when the number of the plurality of linear light bars arranged along the extending direction of the first symmetric axis in the light emitting module is odd, at least one linear light bar is disposed at the position of the second symmetric axis, for example, see fig. 6 or fig. 7; when the number of the plurality of linear light bars arranged along the extending direction of the first symmetry axis in the light emitting module is an even number, the linear light bars do not exist at the position of the second symmetry axis, that is, the even number of linear light bars are symmetrically distributed on two sides of the second symmetry axis, for example, see fig. 3, fig. 4, or fig. 5.
Optionally, referring to fig. 3 and 6, 1 linear light bar 302 may be disposed in each illumination area k; alternatively, referring to fig. 4, 5 and 7, 2 linear light bars 302 may be disposed in each illumination area k; or, each lighting area may also be provided with 3 or more than 3 linear light bars, and the number of the linear light bars in each lighting area may be determined according to the size of the light emitting module, the actual brightness requirement, and the like, which is not limited in the embodiment of the present invention.
Optionally, two ends, which are relatively close to each other, of the two linear light bars symmetrically arranged according to the first symmetric axis may be abutted to each other, or may be separated from each other, which is not limited in the embodiment of the present invention.
In summary, in the light emitting module provided in the embodiment of the present invention, the plurality of linear light bars in the light emitting module have the first symmetric axis and the second symmetric axis that are perpendicular to each other, and since the first ends of the linear light bars are close to the first symmetric axis relative to the second ends and the first ends are close to the second symmetric axis relative to the second ends, compared with the light emitting module shown in fig. 1, the distance between the linear light bars in the illumination area and the four corners of the substrate is reduced, so that the light intensity of the light emitted by the light emitting units on the light bars reaching the corner area of the optical film material can be increased, the brightness of the corner area of the optical film material is improved, and the light emitting uniformity of the light emitting module is improved; compared with the light emitting module shown in fig. 2, because the light bars adopted in the embodiment of the invention are all linear light bars, the cutting utilization rate of the PCB can be improved, and the preparation cost of the light emitting module is further reduced.
Fig. 8 is a schematic structural diagram of a direct type backlight module according to an embodiment of the present invention, as shown in fig. 8, including: an optical film material 40 and a light emitting module 30, wherein the optical film material 40 is located at a light emitting side of the light emitting module 30, and the light emitting module 30 can be a light emitting module as shown in any one of fig. 3 to 7.
Optionally, the optical film may include a diffusion sheet, a brightness enhancement sheet, a prism film layer, and the like, which are stacked in a direction away from the light emitting module. The diffusion sheet is used for homogenizing light rays emitted by the light-emitting module, the brightness enhancement sheet is used for improving the light ray brightness, and the prism film layer is used for further homogenizing the light rays.
Optionally, referring to fig. 8, the direct type backlight module further includes: the back plate 50, the back plate 50 covers the other sides of the light-emitting module 30 except the light-emitting side; the substrate board of the light emitting module is multiplexed with the back plate 50.
The substrate base plate of the light-emitting module is multiplexed with the back plate, namely, a plurality of linear light bars in the light-emitting module can be directly arranged on the back plate in the direct type backlight module. Optionally, the backplate is metal backplate, can fix a plurality of straight line shape lamp strips that set up on the backplate through pasting or welded mode.
Optionally, a plurality of linear light bars in the light emitting module may also be prepared on the substrate base plate, and then the substrate base plate is fixedly disposed on the back plate, which is not limited in the embodiment of the present invention.
In summary, the direct type backlight module provided by the embodiment of the invention includes an optical film material and a light emitting module, wherein a plurality of linear light bars in the light emitting module have a first symmetric axis and a second symmetric axis that are perpendicular to each other, and because a first end of each linear light bar is close to the first symmetric axis relative to a second end and a first end is close to the second symmetric axis relative to the second end, compared with the light emitting module shown in fig. 1, the distance between the linear light bar in an illumination area and four corners of a substrate is reduced, so that light intensity of light rays emitted by light emitting units on the light bars reaching corner areas of the optical film material can be increased, brightness of the corner areas of the optical film material is increased, and light emitting uniformity of the light emitting module is improved, thereby ensuring optical quality of the direct type backlight module; compared with the light emitting module shown in fig. 2, because the light bars adopted in the embodiment of the invention are all linear light bars, the cutting utilization rate of the PCB can be improved, and the preparation cost of the light emitting module, namely the preparation cost of the direct type backlight module, can be reduced.
An embodiment of the present invention provides a display device, including: such as the direct type backlight module shown in fig. 8.
Optionally, the display device provided in the embodiment of the present invention is a liquid crystal display device, the liquid crystal display device further includes a liquid crystal display panel, and the direct type backlight module is located on a back surface of the liquid crystal display panel.
The display device can be any product or component with a display function, such as a television, a liquid crystal display, a notebook computer, a monitor, a lamp box, a digital photo frame, a navigator and the like.
In summary, the display device provided in the embodiments of the invention includes a direct-type backlight module, the direct-type backlight module includes an optical film and a light-emitting module, the plurality of linear light bars in the light-emitting module have a first symmetry axis and a second symmetry axis which are perpendicular to each other, because the first end of the linear light bar is close to the first symmetry axis relative to the second end and the first end is close to the second symmetry axis relative to the second end, compared with the light emitting module shown in fig. 1, the distance between the linear light bar in the illumination area and the four corners of the substrate base plate is reduced, thereby increasing the light intensity of the light emitted by the light-emitting unit on the light bar reaching the corner area of the optical film material, improving the brightness of the corner area of the optical film material, the light-emitting uniformity of the light-emitting module is improved, so that the optical quality of the direct type backlight module is ensured, and the display effect of the display device is ensured; compared with the light emitting module shown in fig. 2, because the light bars adopted in the embodiment of the invention are all linear light bars, the cutting utilization rate of the PCB can be improved, and the preparation cost of the light emitting module, namely the preparation cost of the display device, is reduced.
Fig. 9 is a flowchart of a method for manufacturing a light emitting module according to an embodiment of the present invention, as shown in fig. 9, the method includes:
Alternatively, the substrate base plate may be a rectangular substrate base plate, and then the opposite first side and second side of the substrate base plate are parallel. The substrate base plate may be made of a metal material, electrolytic lead galvanized steel Sheet (SECC), or polyvinyl chloride material, which is not limited in the embodiment of the present invention.
It should be noted that the light emitting module provided in the embodiments of the present invention is applied to a direct type backlight module. Optionally, the substrate base plate may be multiplexed with a back plate in the direct type backlight module.
At least one linear light bar is arranged in each lighting area, each linear light bar is provided with a first end and a second end, the first ends are close to the first symmetrical axis relative to the second ends, and the first ends are close to the second symmetrical axis relative to the second ends.
Alternatively, the light emitting module shown in any one of fig. 3 to 7 may be prepared by using the method for manufacturing the light emitting module shown in fig. 9.
In summary, in the manufacturing method of the light emitting module provided in the embodiment of the present invention, the plurality of linear light bars are disposed on the substrate, and the plurality of linear light bars have the first symmetric axis and the second symmetric axis that are perpendicular to each other, because the first ends of the linear light bars are close to the first symmetric axis relative to the second ends, and the first ends are close to the second symmetric axis relative to the second ends, compared with the light emitting module shown in fig. 1, the distance between the linear light bars in the illumination area and the four corners of the substrate is reduced, so that the light intensity of the light emitted by the light emitting units on the light bars reaching the corner area of the optical film material can be increased, the brightness of the corner area of the optical film material is improved, and the light emitting uniformity of the light emitting module is improved; compared with the light emitting module shown in fig. 2, because the light bars adopted in the embodiment of the invention are all linear light bars, the cutting utilization rate of the PCB can be improved, and the preparation cost of the light emitting module is further reduced.
Optionally, the implementation process of step 602 includes:
and S21, arranging at least one linear light bar parallel to the second symmetry axis in the lighting area, wherein the linear light bar has a first end and a second end, and the first end is close to the first symmetry axis relative to the second end.
And S22, moving the second end of the linear light bar towards the direction far away from the second symmetry axis, so that the second end is far away from the second symmetry axis relative to the first end.
Optionally, the first end of the linear light bar may be fixed, and the linear second end may rotate around the first end in a direction away from the second axis of symmetry.
Optionally, the implementation process of step 602 may further include: at least one linear light bar is arranged at the position of the second symmetrical axis. For example, referring to fig. 6 or 7, the second axis of symmetry may be positioned to provide at least one linear light bar.
Alternatively, the moving distance of the second end of the linear light bar can be determined based on two brightness indexes of the direct backlight module. Wherein, the two brightness indexes can be: the ratio of the brightness of the four corners of the direct type backlight module to the central brightness is not less than 50%, and the ratio of the brightness of the edge 1/9 point of the direct type backlight module to the central brightness is more than 70%.
For example, fig. 10 is a schematic diagram of a light exit surface of a direct type backlight module, as shown in fig. 10, the light exit surface of the direct type backlight module is rectangular, and has two adjacent edges L3 and L4, two target points are determined on L3, a distance between one target point and one end point of L3 is 1/9 of the length of L3, a distance between the other target point and the other end point of L3 is 1/9 of the length of L3, two straight lines (I1 and I2) perpendicular to L3 are respectively formed through the two target points, and a straight line I3 perpendicular to L3 is formed through a middle point of L3. Similarly, two target points are determined on L4, the distance between one target point and one end point of L4 is equal to 1/9 of the length of L4, the distance between the other target point and the other end point of L4 is equal to 1/9 of the length of L4, and two straight lines (I4 and I5) perpendicular to L4 are respectively made through the two target points, and a straight line I6 perpendicular to L4 is made through the middle point of L4. The side length 1/9 point of the direct type backlight module is an intersection point a of I1 and I4, an intersection point b of I1 and I6, an intersection point c of I1 and I5, an intersection point d of I2 and I4, an intersection point e of I2 and I6, an intersection point f of I2 and I5, an intersection point g of I3 and I4, and an intersection point h of I3 and I5, and an intersection point k of I3 and I6 is a central point of the direct type backlight module.
Optionally, a difference between a distance between the second end of the linear light bar and the second symmetry axis in the lighting area of the light emitting module and a distance between the first end of the linear light bar and the second symmetry axis ranges from 5 to 20 mm, that is, a distance between the second end of the linear light bar and the first end of the linear light bar in the extending direction of the first symmetry axis x ranges from 5 to 20 mm. The distance range is not limited in the embodiment of the present invention.
For example, when the direct-type backlight module includes the light emitting module shown in fig. 6, and the distance between the second end and the first end of the linear light bar in the illumination area in the extending direction of the first symmetry axis x is 20 mm, the luminance value of the intersection a on the light exit surface is 5000, the luminance value of the intersection b is 5500, the luminance value of the intersection c is 4900, the luminance value of the intersection d is 4900, the luminance value of the intersection e is 5650, the luminance value of the intersection f is 5050, the luminance value of the intersection g is 5250, the luminance value of the intersection h is 5200, the luminance value of the intersection k is 6600, and the luminance values at four vertex angles (p, q, m, and n) of the light exit surface are 4150, 428, 4150, and n, respectively0. 4000 and 4325. Wherein the luminance units are candelas per square meter (cd/m)2). Based on the brightness values of the above points, the ratio of the minimum brightness to the central brightness at the point with the side length 1/9 of the direct-type backlight module is 4900/6600-74.2%, and the ratio of the minimum brightness to the central brightness at the four corners is 4150/6600-60.6%.
Further, for example, when the direct-type backlight module includes the light emitting module shown in fig. 1 in the related art, the luminance value of the intersection a on the light emitting surface is 4550, the luminance value of the intersection b is 5700, the luminance value of the intersection c is 4500, the luminance value of the intersection d is 4650, the luminance value of the intersection e is 5800, the luminance value of the intersection f is 4450, the luminance value of the intersection g is 5300, the luminance value of the intersection h is 5100, the luminance value of the intersection k is 6600, and the luminance values at four vertex angles (p, q, m, and n) of the light emitting surface are 3150, 3300, 3200, and 3200, respectively. Wherein, the luminance units are cd/m2. Based on the brightness values of the above points, the ratio of the minimum brightness to the central brightness at the point with the side length 1/9 of the direct-type backlight module is 4450/6600-67.4%, and the ratio of the minimum brightness to the central brightness at the four corners is 3150/6600-47.7%.
Based on the two sets of data, the light-emitting module provided by the embodiment of the invention can improve the ratio of the brightness of the four corners of the direct type backlight module to the central brightness and the ratio of the brightness of the side length 1/9 point of the direct type backlight module to the central brightness, and further improve the light-emitting uniformity of the direct type backlight module.
It should be noted that, the sequence of the steps of the method for manufacturing the light emitting module according to the embodiment of the present invention may be appropriately adjusted, and the steps may be increased or decreased according to the circumstances.
In summary, in the manufacturing method of the light emitting module provided in the embodiment of the present invention, the plurality of linear light bars are disposed on the substrate, and the plurality of linear light bars have the first symmetric axis and the second symmetric axis that are perpendicular to each other, because the first ends of the linear light bars are close to the first symmetric axis relative to the second ends, and the first ends are close to the second symmetric axis relative to the second ends, compared with the light emitting module shown in fig. 1, the distance between the linear light bars in the illumination area and the four corners of the substrate is reduced, so that the light intensity of the light emitted by the light emitting units on the light bars reaching the corner area of the optical film material can be increased, the brightness of the corner area of the optical film material is improved, and the light emitting uniformity of the light emitting module is improved; compared with the light emitting module shown in fig. 2, because the light bars adopted in the embodiment of the invention are all linear light bars, the cutting utilization rate of the PCB can be improved, and the preparation cost of the light emitting module is further reduced.
The structure and material of the light emitting module in the above method embodiments have been described in detail in the structure-side embodiments, and will not be described in detail here.
The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which 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.
The invention is not to be considered as limited to the particular embodiments shown and described, but is to be understood that various modifications, equivalents, improvements and the like can be made without departing from the spirit and scope of the invention.
Claims (8)
1. A light emitting module, comprising:
a base substrate having opposing first and second sides;
the linear light bars are arranged on the substrate base plate, the linear light bars are provided with a first symmetrical axis and a second symmetrical axis which are perpendicular to each other, the first symmetrical axis and the second symmetrical axis define a plurality of lighting areas on the substrate base plate, and the arrangement direction of the first edge and the second edge is parallel to the first symmetrical axis;
wherein at least one linear light bar is disposed in each of the lighting areas, the linear light bar having a first end and a second end, the first end being proximate to the first axis of symmetry relative to the second end, and the first end being proximate to the second axis of symmetry relative to the second end;
the included angle between each linear light bar and the first symmetric axis and the included angle between each linear light bar and the second symmetric axis in the lighting area where the linear light bar is located are acute angles, two linear light bars symmetrically arranged according to the first symmetric axis are in a V shape, and the openings of the two linear light bars arranged in the V shape are back to the second symmetric axis; the two linear light bars symmetrically arranged according to the second symmetry axis are in a V shape, and the openings of the two linear light bars arranged in the V shape are back to the first symmetry axis;
a plurality of linear light bars arranged in an array along the extending direction parallel to the first symmetry axis are arranged in each lighting area, and each linear light bar comprises a first linear light bar and a second linear light bar;
the inclination degree of the first linear light bar relative to the second symmetry axis is smaller than the inclination degree of the second linear light bar relative to the second symmetry axis, and the distance between the first linear light bar and the second symmetry axis is smaller than the distance between the second linear light bar and the second symmetry axis.
2. The lighting module of claim 1, wherein the plurality of linear light bars comprises at least one linear light bar positioned at the second axis of symmetry.
3. A method for manufacturing a light emitting module is characterized by comprising the following steps:
providing a base substrate having first and second opposing edges;
arranging a plurality of linear light bars on the substrate, wherein the linear light bars are provided with a first symmetrical axis and a second symmetrical axis which are perpendicular to each other, the first symmetrical axis and the second symmetrical axis define a plurality of lighting areas on the substrate, and the arrangement directions of the first edge and the second edge are parallel to the first symmetrical axis;
the lighting device comprises a lighting area, a plurality of linear light bars and a plurality of lighting areas, wherein at least one linear light bar is arranged in each lighting area, each linear light bar is provided with a first end and a second end, the first end is close to the first symmetry axis relative to the second end, the first end is close to the second symmetry axis relative to the second end, the included angle between each linear light bar and the first symmetry axis and the included angle between each linear light bar and the second symmetry axis in the lighting area where the linear light bar is located are acute angles, two linear light bars symmetrically arranged according to the first symmetry axis are in a V shape, and the openings of the two linear light bars arranged in the V shape are opposite to the second symmetry axis; the two linear light bars symmetrically arranged according to the second symmetry axis are in a V shape, and the openings of the two linear light bars arranged in the V shape are back to the first symmetry axis; a plurality of linear light bars arranged in an array along the extending direction parallel to the first symmetry axis are arranged in each lighting area, and each linear light bar comprises a first linear light bar and a second linear light bar;
the inclination degree of the first linear light bar relative to the second symmetry axis is smaller than the inclination degree of the second linear light bar relative to the second symmetry axis, and the distance between the first linear light bar and the second symmetry axis is smaller than the distance between the second linear light bar and the second symmetry axis.
4. The method of claim 3, wherein disposing a plurality of linear light bars on the substrate base plate comprises:
disposing at least one linear light bar parallel to the second axis of symmetry within the lighting area, the linear light bar having a first end and a second end, the first end being proximate the first axis of symmetry relative to the second end;
and moving the second end of the linear light bar towards the direction far away from the second symmetry axis, so that the second end is far away from the second symmetry axis relative to the first end.
5. The method of claim 3 or 4, wherein disposing a plurality of linear light bars on the substrate base plate comprises:
and at least one linear light bar is arranged at the position of the second symmetrical shaft.
6. A direct type backlight module is characterized by comprising: the light emitting module of claim 1 or 2 and an optical film, wherein the optical film is located on the light emitting side of the light emitting module.
7. The direct type backlight module according to claim 6, further comprising: the backboard coats the other sides of the light-emitting module except the light-emitting side;
and the substrate base plate of the light-emitting module is multiplexed with the backboard.
8. A display device, comprising: the direct type backlight module according to claim 6 or 7.
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| CN112666754B (en) * | 2020-12-31 | 2024-08-09 | 武汉恒生光电产业有限公司 | Lamp strip structure and display |
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