CN111045252B - Direct type backlight module and manufacturing method of light homogenizing plate - Google Patents
Direct type backlight module and manufacturing method of light homogenizing plate Download PDFInfo
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- CN111045252B CN111045252B CN201911328892.7A CN201911328892A CN111045252B CN 111045252 B CN111045252 B CN 111045252B CN 201911328892 A CN201911328892 A CN 201911328892A CN 111045252 B CN111045252 B CN 111045252B
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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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- 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
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- 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
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
Abstract
The invention discloses a direct type backlight module and a manufacturing method of a light-equalizing plate, wherein the direct type backlight module comprises the light-equalizing plate and an LED light source arranged at the light inlet surface of the light-equalizing plate, an ink layer is coated on the light outlet surface of the light-equalizing plate, the light-equalizing plate and the ink layer form light outlet holes for emitting light rays, the light outlet holes are distributed sparsely to densely along the direction from the same LED light source to the direction far away from the same LED light source, the diameters of the light outlet holes are distributed from small to large along the direction from the same LED light source to the direction far away from the same LED light source, a reflecting plate is arranged at the light inlet surface of the light-equalizing plate, the LED light source is arranged between the light-equalizing plate and the reflecting plate, and the fixed end of the LED light source is fixed on the reflecting surface of the reflecting plate; the light splitting effect of the light homogenizing plate is improved, and the product quality is further improved.
Description
Technical Field
The invention relates to the technical field of backlight modules, in particular to a direct type backlight module and a manufacturing method of a light homogenizing plate.
Background
The liquid crystal display screen needs light to penetrate through the liquid crystal layer, and the liquid crystal layer change can be observed by human eyes. The backlight module is disposed under the liquid crystal display panel and used for providing light to the liquid crystal display panel, and the light provided by the backlight module uniformly penetrates through the liquid crystal layer.
However, the existing light guide plate can only be used in a side-in type backlight module, and reflects a side-in type light source to enter a liquid crystal display screen, but for a direct-type backlight module, the existing light guide plate cannot uniformly split the light source, so that the display quality of liquid crystal display is reduced.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a direct type backlight module and a manufacturing method of a light equalizing plate, which improve the light splitting effect of the light equalizing plate and further improve the product quality.
The invention provides a direct type backlight module which comprises a light homogenizing plate and an LED light source arranged on the light incidence surface of the light homogenizing plate, wherein an ink layer is coated on the light emergence surface of the light homogenizing plate, and the light homogenizing plate and the ink layer form a light emergent hole for emergent light.
Further, the light emitting holes are distributed from sparse to dense along the direction from the same LED light source to far away from the same LED light source.
Furthermore, the diameters of the light-emitting holes are distributed from small to large along the direction from the same LED light source to the same LED light source.
Furthermore, the light incident surface of the light homogenizing plate is provided with a reflecting plate, the LED light source is arranged between the light homogenizing plate and the reflecting plate, and the fixed end of the LED light source is fixed on the reflecting surface of the reflecting plate.
Further, the surface of the light homogenizing plate is smooth.
Furthermore, the LED light sources and the light outlet holes are arranged in a matrix;
the interval l of each row of light holes 1 ：
Area S of m-th light outlet (4) of each row m ：
The distance l between each row of light emitting holes (4) 2 ：
The area S of the nth light outlet hole (4) of each row n ：
Wherein L is 1 The farthest distance between two adjacent LED light sources, L 2 For the nearest distance between two adjacent LED light sources, the light outlet hole right above the LED light source is marked as the 1 st light outlet hole, and N is the position of one LED light source
The number of the light-emitting holes within the distance, N is the nth light-emitting hole in the N light-emitting holes, N is more than or equal to 1 and less than N, and the column S m The area of the corresponding maximum light-emitting hole does not include the area of the light-emitting hole in the center of the rectangle, and the center of the rectangle is the corresponding central position of the rectangular arrangement of the four LED light sources.
Further, when the four LED light sources are arranged in a rectangular shape, the area S of the light outlet hole at the center of the rectangular shape c ；
A method for manufacturing a direct type light homogenizing plate comprises the following steps:
(a) selecting a fixed area in the backlight module, wherein the fixed area at least comprises four rectangular LED light sources and light outlets for emitting light rays of the LED light sources, and the light outlets are arranged on the light outlet surface of the light homogenizing plate;
(b) selecting a light homogenizing plate to be manufactured, coating an ink layer on a light emitting surface of the light homogenizing plate to be manufactured according to the fact that light emitting holes are distributed from sparse to dense along the direction from the same LED light source to the direction away from the same LED light source, and taking the position, which is not coated with the ink layer, of the light homogenizing plate to be manufactured as the light emitting holes;
(c) placing the uniform light plate to be manufactured coated with the ink layer in the fixed area to obtain a display result of the display module;
(d) repeating steps (b) to (c) when the display result deviates from a predetermined result; and when the display result is in a preset result, finishing the manufacture of the light equalizing plate.
The invention provides a direct type backlight module and a manufacturing method of a light equalizing plate, which have the advantages that: according to the direct type backlight module and the manufacturing method of the light equalizing plate, provided by the structure, the small-size light equalizing plate can be verified in the manufacturing process of the light equalizing plate coated with the ink layer, after the small-size light equalizing plate is successfully verified, the small-size light equalizing plate can be directly printed on a large plate according to the required size of the large plate, so that the waste of materials caused by secondary cutting is avoided, the light equalizing plate can be adjusted to the optimal light splitting state in the backlight modules corresponding to different specifications, and the product quality is improved; the light-emitting holes at the positions close to the LED light sources are small in diameter and small in density, the light-emitting holes at the positions far away from the LED light sources are large in diameter and large in density, and the distance and the size of the light-emitting holes are adjusted, so that the LED backlight module is suitable for backlight modules of different specifications; meanwhile, light irradiated on the ink layer by the LED light source is reflected to the reflecting surface of the reflecting plate firstly and then reflected to the light outlet hole, so that the utilization rate of the light source is improved to a certain extent, the brightness of the light equalizing plate is enhanced, and the display brightness of the display screen is improved.
Drawings
FIG. 1 is a schematic view of a direct-type backlight module according to the present invention;
FIG. 2 is a schematic diagram showing the arrangement and distribution of light-emitting holes on a light-equalizing plate;
FIG. 3 is a flow chart of the steps of a method for fabricating a light homogenizing plate;
FIG. 4 is a schematic view of a selection of 9 test positions for the optical effect display test of the light-equalizing plate;
FIG. 5 is a schematic view of 13 test positions selected for the optical effect display test of the light-equalizing plate;
the LED light source comprises a light source body, a light source, an ink layer, a light outlet hole and a reflecting plate, wherein the light source body comprises 1-a light homogenizing plate, 2-an LED light source, 3-the ink layer, 4-the light outlet hole and 5-the reflecting plate.
Detailed Description
The present invention is described in detail below with reference to specific embodiments, and in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Referring to fig. 1 and 2, the direct type backlight module provided by the invention comprises a light homogenizing plate and an LED light source 2 arranged on a light incident surface of the light homogenizing plate 1, wherein an ink layer 3 is coated on a light emergent surface of the light homogenizing plate 1, and the light homogenizing plate 1 and the ink layer 3 form a light emergent hole 4 for emergent light.
In a traditional direct type backlight module, a diffusion plate added with optical particles is commonly used for diffusing a light source, and then the diffused light source is displayed in a display screen, but part of light is lost after the light passes through the optical particles of the diffusion plate; when the light guide plate of side income formula is directly applied to straight following formula backlight unit simultaneously, will cause reflection and the refraction of light source, can not effectively get into the display screen for the deviation appears in the display effect of display screen, and then has reduced the display quality of ultimate display screen. This application is direct coats printing ink layer 3 on the glossy equal worn-out fur 1 in surface, and the position of not coating printing ink layer 3 on the equal worn-out fur 1 is as the position of light-emitting hole 4, and the light that LED light source 2 sent directly jets out through the light-emitting hole, does not have the light loss, has improved the utilization efficiency of light source.
Meanwhile, during actual production, the production mode of the uniform light plate 1 is large plate production, the diffusion parameter during the production of the large-size uniform light plate 1 is a fixed value, and the optimal light splitting state cannot be achieved when the large-size uniform light plate 1 is used in cooperation with direct-type backlights with different specifications, therefore, when the required uniform light plate 1 is large plate size, in order to enable the uniform light plate 1 coated with the ink layer 3 to achieve a better light splitting effect in an actual backlight module, the small-size uniform light plate 1 coated with the ink layer 3 can be used for display verification in the actual backlight module, according to the verification result, the coating connection position of the ink layer 3 and the uniform light plate 1 is adjusted to finely adjust the position of the light outlet 4, so that light emitted by the LED light source 2 can be effectively split through the light outlet 4; after the verification is passed, the ink layer 3 is coated on the large-size light equalizing plate 1 according to the position relation of the ink layer 3 coated on the small-size light equalizing plate 1 which is verified to pass, so that the defect of material waste caused by secondary cutting of the large-size light equalizing plate 1 is avoided, in the adjustment verification process, the large-size light equalizing plate 1 is verified, the research and development cost is saved, and the utilization efficiency of the light equalizing plate 1 is improved. Meanwhile, the light equalizing plate 1 can be adjusted to the best light splitting state in backlight modules corresponding to different specifications, and the product quality is improved.
Preferably, when the light emitted from the LED light source 2 irradiates the ink layer 3, the light is reflected and cannot enter the display screen, and if the reflected light cannot be reused, light resources are wasted, so that the reflective plate 5 is disposed on the light incident surface of the light homogenizing plate, the LED light source 2 is disposed between the light homogenizing plate and the reflective plate 5, and the fixed end of the LED light source 2 is fixed on the reflective surface of the reflective plate 5. The light reflected by the ink layer 3 is reflected to the reflection surface of the reflection plate 5, and then the light is reflected to the light emitting surface of the light homogenizing plate 1 again, and is reflected circularly until the light is emitted from the light emitting hole 4 (the maximum diameter of the light emitting hole 4 is generally 3mm) and enters the display screen. The arrangement of the light reflection circulation improves the utilization rate of the light source of the LED light source 2, enhances the brightness of the light splitting plate, and further improves the display brightness and the display quality of the display screen.
The equal smooth setting in equal worn-out fur 1 upper and lower surface simultaneously will see through equal worn-out fur 1 and shine on the partial light reflection of printing ink layer 3 utilizes again on 5 reflecting plates, has improved display module's whole luminance.
Preferably, as shown in fig. 2, the distance between the traditional diffusion plate and the LED light source 2 is large when the traditional diffusion plate is used, so that the thickness of the whole backlight module is large, light splitting can be better completed through the distance and the size of the light outlet holes 4, the distance between the light splitting plate and the lamp is reduced, and the thickness of the product is finally reduced. The preferred treatments for the light exit opening 4 are therefore: the light emitting holes 4 are distributed from sparse to dense along the direction from the same LED light source 2 to far away from the same LED light source 2. The diameters of the light-emitting holes 4 are distributed from small to large along the direction from the same LED light source 2 to the direction far away from the same LED light source 2. Because the light intensity emitted by the LED light source 2 is weakened along with the increase of the distance from the LED light source 2, the diameter of the light outlet hole 4 which is closer to the LED light source 2 is smaller, and the diameter of the light outlet hole 4 which is farther from the LED light source 2 is larger, so that the light intensity deviation emitted from the light outlet holes 4 is not large, finally, the light intensity entering each area of the display screen is basically consistent, and the display uniformity and the display brightness of the display screen are improved.
Preferably, for setting the diameter and position of the light-emitting holes 4, the LED light sources 2 and the light-emitting holes 4 are arranged in a matrix;
the distance l of each row of light holes 4 1 ：
Area S of m-th light outlet hole in each row m ：
Area S of the nth light-emitting hole 4 of each row n ：
The distance l between each row of light-emitting holes 4 2 ：
Area S of the maximum light-emitting hole 4 max ：
Area S of the maximum light-emitting hole 4 min ：
When the four LED light sources 2 are arranged in a rectangular shape, the area S of the light outlet 4 at the center of the rectangular shape c ；
Wherein L is 1 Is the farthest distance, L, between two adjacent LED light sources 2 For the nearest distance between two adjacent LED light sources, the light outlet hole right above the LED light source is marked as the 1 st light outlet hole, and N is the position of one LED light source
The number of light-emitting holes within the distance, N is the nth light-emitting hole of N light-emitting holes, N is more than or equal to 1 and less than N, and the column S m Area S of the corresponding maximum light-emitting hole max Does not compriseThe area of the light outlet hole 4 at the center of the rectangle is the central position corresponding to the rectangular arrangement of the four LED light sources at the center of the rectangle; the rows and columns are vertical horizontal lines based on each LED light source 2, that is, when there are two LED light sources and the light emitting holes corresponding to the LED light sources are calculated, the light emitting holes due to the LED light sources are respectively obtained based on each LED light source as the row and column. The diameter d of the maximum light-emitting holes of the row is equal to l 1 。
As shown in fig. 3, a method for manufacturing a direct type light uniformizing plate includes the following steps:
s1: selecting a fixed area in the backlight module, wherein the fixed area at least comprises four rectangular LED light sources 2 and light emitting holes 4 for emitting light rays of the LED light sources 2, and the light emitting holes 4 are arranged on the light emitting surface of the light homogenizing plate 1;
the purpose of selecting the fixed area is to keep the measuring position consistent in the design and proofing process of the light equalizing plate 1, and reduce the defect of interference on the design of the light equalizing plate 1 caused by the placing position.
The LED light sources 2 in the backlight module are arranged in a rectangular shape, so that a fixed area can be selected as a verification area of the light equalizing plate 1, the defect that the material is wasted due to secondary cutting of the light equalizing plate 1 with a large size is avoided by verifying the ink coating layer 3 coated on the light equalizing plate 1 with a small size before the ink coating layer 3 is coated on the light equalizing plate 1 with a large size, meanwhile, the light equalizing plate 1 can be adjusted to the best light splitting state in the backlight module corresponding to different specifications, and the product quality is improved.
S2: selecting a light homogenizing plate to be manufactured, coating an ink layer 3 on the light emitting surface of the light homogenizing plate to be manufactured according to the fact that light emitting holes 4 are distributed sparsely or densely along the direction from the position close to the same LED light source 2 to the position far away from the same LED light source 2, and taking the position, which is not coated with the ink layer 3, of the light homogenizing plate to be manufactured as the light emitting hole 4;
the light holes 4 are arranged in a matrix, and the diameters of the light holes 4 are distributed from small to large along the direction from the same LED light source 2 to the direction far away from the same LED light source 2; suppose the farthest distance of 2 adjacent LED light sources 2 is L 1 One LED lamp is arranged at one side L 1 The number of the light emitting holes which need to be arranged within the distance of 2 is N (the rows and the columns areVertical or horizontal lines based on the LED lamps), when the designed light emitting holes 4 are crossed, the crossed light emitting holes 4 are cancelled, and the nearest non-crossed light emitting hole is selected.
According to the design size of light-emitting hole 4, calculate the coating size of the printing ink layer 3 that obtains and all worn-out fur 1, when coating printing ink layer 3 on all worn-out fur 1, at first fixed all worn-out fur 1, avoid all worn-out fur 1 because the deviation appears in the position at the coated in-process, cause the defect of 3 coating deviations in printing ink layer.
S3: placing the uniform light plate to be manufactured coated with the ink layer 3 in the fixed area to obtain a display result of the display module;
and drying the ink layer 3 on the uniform light plate to be manufactured, and then combining the ink layer with the LED light source 2 and the display screen for displaying to obtain a display effect.
S4: judging whether the display result deviates from a preset result, if so, repeatedly entering the step S2, and if not, entering the step S5;
s5: and indicating that the display result is in a preset result, and finishing the manufacture of the light equalizing plate.
The preset result is that the display picture of the display module has no obvious light shadow, the light homogenizing plate has no obvious bright and dark or stripe phenomenon, and the light homogenizing plate is similar to a piece of white paper under visual observation.
After the display image of the display module has no obvious lamp shadow, the optical effect display test of the light equalizing plate is carried out, generally, 9 points or 13 points are selected on the light equalizing plate, the test positions are shown as figures 4 and 5, and when more than 80% of test points have no obvious brightness or stripes, the light equalizing plate is manufactured. The requirements of more than 80 percent of the test points can be changed as required according to the requirements of a display and a customer.
When the display result deviates from the preset result, a new uniform light plate to be manufactured is selected again, the position of the ink layer 3 on the uniform light plate to be manufactured is finely adjusted (namely the position of the light outlet hole 4 is finely adjusted) according to the display effect of the uniform light plate to be manufactured of the last coating ink layer 3, the uniform light plate to be manufactured of the new coating ink layer 3 is obtained, the new uniform light plate to be manufactured of the new coating ink layer 3 is combined with the LED light source 2 and the display screen to be displayed, and another display effect is obtained. And judging whether the display result deviates from the preset result again, if so, repeatedly acquiring a new uniform light plate to be manufactured again, and performing display verification. And (4) until the display result is within the preset result, indicating that the manufacturing of the light-equalizing plate coated with the ink layer 3 is finished.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (8)
1. A direct type backlight module is characterized by comprising a light homogenizing plate (1) and an LED light source (2) arranged on the light incident surface of the light homogenizing plate (1), wherein an ink layer (3) is coated on the light emergent surface of the light homogenizing plate (1), and the light homogenizing plate (1) and the ink layer (3) form a light emergent hole (4) for emitting light rays;
the LED light sources (2) and the light outlet holes (4) are arranged in a matrix;
the distance l of each row of light holes (4) 1 ：
Area S of mth light outlet (4) in each row m ：
The area S of the nth light outlet hole (4) of each row n ：
Wherein L is 1 For the farthest distance between two adjacent LED light sources, the light outlet hole right above the LED light source is recorded as the 1 st light outlet hole, and N is the position of one LED light source
The number of the light holes within the distance, N is the nth light hole of the N light holes, N is more than or equal to 1 and less than N, m is more than or equal to 1 and less than N, and the column S m The area of the corresponding maximum light-emitting hole does not include the area of the light-emitting hole in the center of the rectangle, and the center of the rectangle is the corresponding central position of the rectangular arrangement of the four LED light sources.
2. A direct type backlight module according to claim 1, characterized in that the light outlets (4) are distributed sparsely to densely along the direction from the same LED light source (2) to far away from the same LED light source (2).
3. The direct type backlight module according to claim 1, wherein the diameters of the light emitting holes (4) are distributed from small to large along the direction from the same LED light source (2) to the same LED light source (2).
4. The direct type backlight module as claimed in claim 1, wherein the light incident surface of the light homogenizing plate (1) is provided with a reflecting plate (5), the LED light source (2) is disposed between the light homogenizing plate (1) and the reflecting plate (5), and the fixed end of the LED light source (2) is fixed on the reflecting surface of the reflecting plate (5).
5. A direct type backlight module according to any of claims 1 to 4, characterized in that the surface of the light homogenizing plate (1) is smooth.
6. A direct type backlight module according to claim 5, characterized in that the distance l between each row of light exit holes (4) 2 ：
Wherein L is 2 The nearest distance between two adjacent LED light sources.
7. A direct type backlight module as claimed in claim 6, characterized in that when the four LED light sources (2) are arranged in a rectangle, the area S of the light exit hole (4) at the center of the rectangle c ；
8. A method for manufacturing a direct type light homogenizing plate is characterized by comprising the following steps:
(a) selecting a fixed area in the backlight module, wherein the fixed area at least comprises four rectangular LED light sources (2) and light emitting holes (4) for emitting light rays of the LED light sources (2), and the light emitting holes (4) are arranged on the light emitting surface of the light homogenizing plate (1);
the LED light sources (2) and the light outlets (4) are arranged in a matrix;
the interval l of each row of the light holes (4) 1 ：
Area S of m-th light outlet (4) of each row m ：
The area S of the nth light outlet hole (4) of each row n ：
Wherein L is 1 For the farthest distance between two adjacent LED light sources, the light outlet hole right above the LED light source is recorded as the 1 st light outlet hole, and N is the position of one LED light source
The number of the light-emitting holes within the distance, N is the nth light-emitting hole in the N light-emitting holes, N is more than or equal to 1 and less than N, m is more than or equal to 1 and less than N, and the column S m The area of the corresponding maximum light-emitting hole does not include the area of the light-emitting hole at the center of the rectangle, and the four LED light sources are arranged at the center of the rectangle in a rectangular shape and correspond to the center position;
(b) selecting a light-homogenizing plate (1) to be manufactured, coating an ink layer (3) on a light-emitting surface of the light-homogenizing plate (1) to be manufactured according to the fact that light-emitting holes (4) are distributed sparsely or densely along the direction from the part close to the same LED light source (2) to the part far away from the same LED light source (2), and using the part, which is not coated with the ink layer (3), of the light-homogenizing plate (1) to be manufactured as the light-emitting hole (4);
(c) placing the uniform light plate (1) to be manufactured coated with the ink layer (3) in the fixed area to obtain a display result of the display module;
(d) repeating steps (b) to (c) when the display result deviates from a predetermined result; and when the display result is in a preset result, the light homogenizing plate (1) is manufactured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911328892.7A CN111045252B (en) | 2019-12-20 | 2019-12-20 | Direct type backlight module and manufacturing method of light homogenizing plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911328892.7A CN111045252B (en) | 2019-12-20 | 2019-12-20 | Direct type backlight module and manufacturing method of light homogenizing plate |
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| Publication Number | Publication Date |
|---|---|
| CN111045252A CN111045252A (en) | 2020-04-21 |
| CN111045252B true CN111045252B (en) | 2022-09-23 |
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| CN201911328892.7A Active CN111045252B (en) | 2019-12-20 | 2019-12-20 | Direct type backlight module and manufacturing method of light homogenizing plate |
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| JP2008282744A (en) * | 2007-05-11 | 2008-11-20 | Sharp Corp | Backlight device and display device equipped with above |
| JP2012174372A (en) * | 2011-02-17 | 2012-09-10 | Sharp Corp | Lighting apparatus, and liquid crystal display |
| CN106842701A (en) * | 2017-01-11 | 2017-06-13 | 深圳市华星光电技术有限公司 | A kind of backlight module and liquid crystal display |
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| KR20070112312A (en) * | 2006-05-20 | 2007-11-23 | 삼성전자주식회사 | Back light assembly and liquid crystal display apparatus having the same |
| JP2012174634A (en) * | 2011-02-24 | 2012-09-10 | Sharp Corp | Light source module and optical member |
| CN104633521A (en) * | 2013-11-06 | 2015-05-20 | 富泰华精密电子（郑州）有限公司 | Backlight module |
| JP2015201287A (en) * | 2014-04-07 | 2015-11-12 | 華宏新技股▲分▼有限公司 | Manufacturing method of light guide plate |
| JP6358894B2 (en) * | 2014-08-20 | 2018-07-18 | 三菱電機株式会社 | Surface light source device and liquid crystal display device |
| WO2017110821A1 (en) * | 2015-12-25 | 2017-06-29 | 京セラ株式会社 | Illumination device and liquid crystal display apparatus |
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| JP2008282744A (en) * | 2007-05-11 | 2008-11-20 | Sharp Corp | Backlight device and display device equipped with above |
| JP2012174372A (en) * | 2011-02-17 | 2012-09-10 | Sharp Corp | Lighting apparatus, and liquid crystal display |
| CN106842701A (en) * | 2017-01-11 | 2017-06-13 | 深圳市华星光电技术有限公司 | A kind of backlight module and liquid crystal display |
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