CN110930890A - COB display screen mask and operation method thereof - Google Patents
COB display screen mask and operation method thereof Download PDFInfo
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- CN110930890A CN110930890A CN201811097636.7A CN201811097636A CN110930890A CN 110930890 A CN110930890 A CN 110930890A CN 201811097636 A CN201811097636 A CN 201811097636A CN 110930890 A CN110930890 A CN 110930890A
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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Abstract
The invention discloses a COB display screen mask and an operation method thereof, and relates to the field of COB display screens. Compared with the prior art, the invention can not generate the problem of deformation caused by thermal expansion and can effectively improve the contrast and the definition of the display screen.
Description
Technical Field
The invention relates to the field of COB (chip on board) display screens, in particular to a COB display screen mask and an operation method thereof.
Background
At present, an LED full-color display screen is formed by packaging an LED rgb chip into an SMD device, and then attaching the SMD device to a PCB by printing, attaching a chip, reflow soldering, or the like. The LED lamp bead used by the module above P2 is an SMD device which is manufactured by encapsulating a chip on a support and mainly carrying out die bonding, wire bonding, dispensing, light splitting, taping and packaging. The COB technology is an emerging LED packaging technology, and is different from the traditional SMD surface-mounted package in that light-emitting chips are integrated into a PCB, rather than being soldered to the PCB. The COB technology effectively improves the luminous color of the LED display screen, reduces risks and reduces cost.
The material process of the COB display screen mask in the prior art is mainly formed by injection molding of PC and fibers; the defect is obvious, the display screen is deformed due to thermal expansion after the mask is used for a long time, and meanwhile, the gap of the inner cavity of the mask is large, and light processing is difficult, so that the contrast is difficult to adjust.
Disclosure of Invention
The invention aims to provide a COB display screen mask and an operation method thereof, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a COB display screen face guard, includes first face guard and second face guard, first face guard covers on the second face guard, be provided with a plurality of first face guard holes and a plurality of second face guard holes on first face guard and the second face guard respectively, first face guard and second face guard all adopt the accurate punching press of aluminum alloy material to form, first face guard hole and second face guard hole match each other and are located same axis on, first face guard aperture internal diameter is greater than second face guard aperture internal diameter.
As a further scheme of the invention: the inner diameters of the first mask hole and the second mask hole are designed according to the contrast of the corresponding display screen.
As a further scheme of the invention: the first face shield and the second face shield are fixed by glue pressing.
As a further scheme of the invention: and the surfaces of the first face mask and the second face mask are subjected to mirror surface treatment.
As a further scheme of the invention: an upper surface rough surface of the second mask, the rough surface being formed by a mirror-surface treatment.
As a still further scheme of the invention: the rough surface is processed by painting, oxidation or electroplating to form a black sub-surface.
The invention also provides an operation method of the COB display screen mask, which comprises the following steps:
1) stamping forming: selecting a high-density aluminum alloy material, and tightly stamping the material through equipment to form a first mask and a second mask; the inner diameters of a first mask hole and a second mask hole are designed according to the contrast of display screens of corresponding models, and the inner diameter of the first mask hole is larger than that of the second mask hole;
2) mirror surface treatment: performing mirror surface treatment on the surfaces of the first face mask and the second face mask to increase the surface brightness to 30%;
3) and (3) pressing operation: covering the second mask on the first mask, enabling the second mask holes and the first mask holes to correspond one by one, enabling the second mask holes and the first mask holes to be located on the same axial line, and fixing the second mask on the first mask through glue pressing operation;
4) and (3) de-mirror processing: performing mirror surface removing treatment on the upper surface of the second mask to form a rough surface;
5) blackening treatment: the rough surface is processed into black sub-surface by painting or oxidation or electroplating.
Compared with the prior art, the invention has the beneficial effects that:
firstly, the aluminum alloy is made of high-density aluminum alloy, so that the problem of thermal expansion is avoided in the subsequent use process, and the deformation is very small; thereby the light guide effect on the light can be well controlled; the problem of unstable contrast caused by deformation is solved.
And secondly, the light can be reflected back and forth by adopting mirror surface treatment, the light is uniformly mixed by multiple reflections of the light, and the light guide length is controlled by light mixing treatment, so that the problems of polarized light and color cast of a display screen can be avoided.
And thirdly, the mask hole is designed to be a structure with a small upper part and a large lower part, so that the effect of light polymerization is achieved, and for products of different models, the black-white contrast of the display screen can be controlled through the size of the aperture of the mask hole.
Fourth, because this application can not have the unusual problem of deformation, this screen mask can be with the mask hole preparation for the minimum interval can make full use of light source more, has reduced light loss.
And fifthly, the upper surface of the face shield is subjected to mirror surface removing treatment to form a black sub-surface, so that the interference of an external light source on the light emission of the display screen body is reduced, and the black-white contrast and the definition of the display screen are further improved.
Drawings
Fig. 1 is an exploded view of the present invention.
FIG. 2 is a cross-sectional view of the present invention.
FIG. 3 is a schematic view of the location of the first and second mask apertures of the present invention.
In the figure: 10-a first face mask, 11-a second face mask, 20-a first face mask hole, 21-a second face mask hole, 23-a rough surface, 30-a PCB board and 31-a light-emitting chip.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1 and 2, a COB display screen mask includes a first mask 10 and a second mask 20, the first mask 10 covers the second mask 20, the first mask 10 and the second mask 20 are respectively provided with a plurality of first mask holes 11 and a plurality of second mask holes 21, and the first mask 10 and the second mask 20 are both formed by precision stamping of an aluminum alloy material, so that the whole mask has precise and uniform size, smooth surface, no spots, no scars, no scratches, and no surface cracks; meanwhile, the alloy material has a good light insulation effect and good heat dissipation performance.
The first mask hole 11 and the second mask hole 21 are matched with each other and are located on the same axial line, the inner diameter of the first mask hole 11 is larger than that of the second mask hole 21, and the surfaces of the first mask 10 and the second mask 20 are both subjected to mirror surface treatment.
During operation, the first mask 10 and the second mask 20 are pressed and fixed through glue, and the inner diameter of the first mask hole 11 is larger than that of the second mask hole 21, so that a structure with a small upper part and a large lower part of the mask hole is formed; the entire display mask is then combined with the PCB board 30.
Light that emitting chip 31 sent all jets into to first face guard hole 11 in, and 11 inner chamber lateral walls in first face guard hole adopt mirror surface to handle, can carry out reciprocal reflection to light, make the light misce bene through the multiple reflection of light, do and mix light processing control leaded light length to can avoid the problem of display screen polarisation, off colour.
Due to the structural design that the upper part of the mask hole is small and the lower part of the mask hole is large, the first mask hole 11 can fully utilize a light source and simultaneously provide sufficient welding space for the light-emitting chip 31; the light in the first mask hole 11 is incident on the second mask hole 21, and the second mask hole 21 has the effect of converging the light. The inner diameters of the first mask hole 11 and the second mask hole 21 are designed according to the contrast of the corresponding display screen, and for products of different models, the black-white contrast of the display screen can be controlled by designing the size of the aperture of the mask hole, so that the adjusting mode of the contrast of the display screen is increased.
Compared with a display screen mask made of a PC material in the prior art, the display screen mask is made of a high-density aluminum alloy material, so that the problem of thermal expansion is avoided in the subsequent use process, and the deformation is very small; the size of the mask hole is unique, and the light guide effect on light rays can be well controlled; the display screen made of the material has no problem of unstable contrast caused by deformation after long-term use.
Meanwhile, as the problem of abnormal deformation does not exist in the mask, the adjacent mask holes can be made to be the minimum distance (0.6-0.7mm) so as to meet the requirement of the minimum LED (shown in figure 3). Compared with the prior art, the light source can be more fully utilized, the light loss is reduced, the optical conversion rate of the display is improved by about 10%, and the optical brightness is improved by about 3% -5%.
Example two:
referring to fig. 1 and 2, as a further optimization of the first embodiment, the difference is that the upper surface of the second cover 20 is roughened 7, the roughened surface 7 is formed by a de-mirror treatment, and the roughened surface 7 is further formed into a black sub-surface by a painting or oxidation or electroplating treatment. Because the black light reflection rate is low, the condition that external light touches the upper surface of the second face mask 20 to generate reflection is effectively reduced; meanwhile, the rough surface 7 further forms diffuse reflection to form irregular reflection, so that the interference on the luminescence of the display screen body is reduced, and the black-white contrast and the definition of the display screen are further improved.
Example three:
on the basis of the above embodiment, the present invention further provides an operation method of a COB display screen mask, which includes the following steps:
1) stamping forming: selecting a high-density aluminum alloy material, and tightly stamping the material by equipment to form a first mask 10 and a second mask 20; the inner diameters of the first mask hole 11 and the second mask hole 21 are designed according to the contrast of a display screen of a corresponding model, and meanwhile, the inner diameter of the first mask hole 11 is larger than the inner diameter of the second mask hole 21 and is designed to be a structural characteristic with a small top and a big bottom.
2) Mirror surface treatment: the surfaces of the first face mask 10 and the second face mask 20 are subjected to mirror surface treatment, so that the surface brightness of the first face mask and the second face mask is increased to 30%, and the reflection effect and the light guide effect of the face mask holes are improved;
3) and (3) pressing operation: covering the first mask 10 with the second mask 20, enabling the second mask hole 21 and the first mask hole 11 to correspond one by one, enabling the second mask hole 21 and the first mask hole 11 to be located on the same axial line, and fixing the second mask on the first mask through glue pressing operation;
4) and (3) de-mirror processing: performing mirror surface removing treatment on the upper surface of the second face cover 20 to form a rough surface 7, wherein when an external light source irradiates the rough surface 7, the rough surface 7 forms diffuse reflection on the rough surface;
5) blackening treatment: the rough surface 7 is processed into a black sub-surface through painting or oxidation or electroplating, so that the reflectivity of external light can be greatly reduced, and the interference to the light source of the display screen is reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a COB display screen face guard, includes first face guard (10) and second face guard (20), first face guard (10) cover on second face guard (20), be provided with a plurality of first face guard holes (11) and a plurality of second face guard holes (21) on first face guard (10) and second face guard (20) respectively, its characterized in that, first face guard (10) and second face guard (20) all adopt the accurate punching press of aluminum alloy material to form, first face guard hole (11) and second face guard hole (21) match each other and are located same axial lead, first face guard hole (11) internal diameter is greater than second face guard hole (21) internal diameter.
2. COB display screen mask according to claim 1, characterized in that the inner diameter of the first (11) and second (21) mask holes are dimensioned according to the contrast of the respective display screen.
3. The COB display screen mask according to claim 1, characterized in that the first mask (10) and the second mask (20) are secured by glue press fit.
4. COB display screen mask according to claim 3, characterized in that the surfaces of the first (10) and second (20) masks are each mirror-finished.
5. COB display screen mask according to claim 4, characterized in that the upper surface of the second mask (20) is a frosted surface (7), the frosted surface (7) being formed by a de-mirroring process.
6. COB display mask according to claim 5, characterized in that the matte surface (7) is formed as a black sub-surface by painting or oxidation or electroplating.
7. An operation method of a COB display screen mask is characterized by comprising the following steps:
1) stamping forming: selecting a high-density aluminum alloy material, and tightly stamping the material by equipment to form a first mask (10) and a second mask (20); the inner diameters of the first mask hole (11) and the second mask hole (21) are designed according to the contrast of display screens of corresponding models, and the inner diameter of the first mask hole (11) is larger than that of the second mask hole (21);
2) mirror surface treatment: the surfaces of the first face mask (10) and the second face mask (20) are subjected to mirror surface treatment, so that the surface brightness of the first face mask and the second face mask is increased to 30%;
3) and (3) pressing operation: covering the first face mask (10) with the second face mask (20), enabling the second face mask hole (21) and the first face mask hole (11) to correspond one by one, enabling the second face mask hole (21) and the first face mask hole (11) to be located on the same axial line, and fixing the second face mask on the first face mask through glue pressing operation;
4) and (3) de-mirror processing: performing a de-mirror treatment on the upper surface of the second mask (20) to form a matte surface (7);
5) blackening treatment: the rough surface (7) is processed into a black sub-surface through painting or oxidation or electroplating treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811097636.7A CN110930890A (en) | 2018-09-20 | 2018-09-20 | COB display screen mask and operation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811097636.7A CN110930890A (en) | 2018-09-20 | 2018-09-20 | COB display screen mask and operation method thereof |
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| Publication Number | Publication Date |
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| CN110930890A true CN110930890A (en) | 2020-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811097636.7A Pending CN110930890A (en) | 2018-09-20 | 2018-09-20 | COB display screen mask and operation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110021588A (en) * | 2018-01-09 | 2019-07-16 | 王定锋 | A kind of LED display mould group of band cup lamp bead and preparation method thereof |
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Effective date of abandoning: 20221101 |