CN110931626A - COB display screen capable of improving black-white contrast and preventing light crosstalk and operation method thereof - Google Patents
COB display screen capable of improving black-white contrast and preventing light crosstalk and operation method thereof Download PDFInfo
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- CN110931626A CN110931626A CN201811097622.5A CN201811097622A CN110931626A CN 110931626 A CN110931626 A CN 110931626A CN 201811097622 A CN201811097622 A CN 201811097622A CN 110931626 A CN110931626 A CN 110931626A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
- H01L33/60—Reflective elements
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- G—PHYSICS
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2933/00—Details relating to devices covered by the group H01L33/00 but not provided for in its subgroups
- H01L2933/0008—Processes
- H01L2933/0033—Processes relating to semiconductor body packages
- H01L2933/0058—Processes relating to semiconductor body packages relating to optical field-shaping elements
Abstract
The invention discloses a COB display screen capable of improving black-white contrast and preventing light crosstalk and an operation method thereof, and relates to the field of COB display screens. According to the invention, through multiple reflection treatment and de-mirrorizing treatment, the problems of polarization and color crosstalk of the COB display screen are effectively solved, and the integral black-white contrast and definition of the display screen are improved.
Description
Technical Field
The invention relates to the field of COB (chip on board) display screens, in particular to a COB display screen capable of improving black-white contrast and preventing light crosstalk 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 existing COB display screen adopts a mould pressing mode, glue is comprehensively adopted to be covered and pressed and then cut, then a mode of spraying ink is adopted, the process flow cost is high, the consistency of the produced product is poor, and the problems of light cross and color cast caused by hard damage in the existing COB display screen cannot be solved.
Disclosure of Invention
The present invention is directed to a COB display panel and a method for operating the same, which can improve the contrast between black and white and prevent crosstalk, so as to solve the problems of the related art.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides an improve COB display screen of black and white contrast and prevent string light, includes PCB board, first face guard and second face guard, first face guard covers on the PCB board, the second face guard covers on first 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 hole and second face guard hole are the one-to-one and are located same axis, the inner chamber packing in first face guard hole has first glue film, the inner chamber packing in second face guard hole has the second glue film, first glue film adopts transparent material's epoxy, the epoxy that contains the additive in the second glue film adopts, the additive is nanometer silica, nanometer silica is black or white.
As a further scheme of the invention: a plurality of light emitting chips are installed to plane equidistance on the PCB board, light emitting chips pass through the silver-colored glue to be fixed on the PCB board.
As a further scheme of the invention: the first face guard and the second face guard all adopt high-density aluminum alloy material.
As a further scheme of the invention: the surface of the first face mask is subjected to mirror surface treatment, the bottom plane of the second face mask is subjected to mirror surface treatment, and the upper plane of the second face mask is subjected to rough surface treatment.
As a further scheme of the invention: the second mask aperture has an inner diameter less than the first mask aperture.
As a still further scheme of the invention: the distance between the axial leads of the adjacent mask holes is 0.6-0.7 mm.
The invention also provides an operation method of the COB display screen, which can improve the black-white contrast and prevent light crosstalk, and the operation method comprises the following steps:
1) dispensing treatment: dispensing the upper surface of the PCB, and coating silver adhesive on the upper surface of the PCB so as to fix the light-emitting chip on the PCB;
2) welding operation: welding the electrode of the light-emitting chip on the upper surface of the PCB through ultrasonic welding treatment;
3) first pressing operation: covering the first face cover on the PCB, and fixedly laminating the first face cover and the PCB through glue, wherein the light-emitting chip penetrates through the inner cavity of the first face cover hole;
4) the first glue pouring operation: in a vacuum environment, filling epoxy resin into the inner cavity of the first face mask hole and infiltrating the mask hole, wherein the epoxy resin is made of a transparent material;
5) and (3) second pressing operation: covering a second mask on the first mask, pressing and fixing the second mask through glue, enabling the second mask hole and the first mask hole to correspond one by one, enabling the second mask hole and the first mask hole to be located on the same axis, and fixing the second mask on the first mask;
6) and (3) glue pouring operation for the second time: and in a vacuum environment, pouring epoxy resin into the inner cavity of the second mask hole and infiltrating the mask hole, wherein the epoxy resin is epoxy resin containing an additive.
Compared with the prior art, the invention has the beneficial effects that:
the light is reflected repeatedly for many times, RGB (red, green and blue) light can be uniformly mixed through multiple reflection of the light, so that stray light scattered out is few, the light is more uniform, and the problems of polarized light and color crosstalk of a COB display screen are solved.
And secondly, the light rays are emitted in the mask holes in a diffuse reflection manner, so that the emitted visual angle is increased, the problem of directional and concentrated emission of part of the light rays is also avoided, and the integral black-white contrast and definition of the display screen are improved.
And thirdly, the distance between the axial leads of the adjacent face mask holes meets the requirement of the minimum LED, so that the light source is fully utilized, the light loss is reduced, and the optical performance of the whole display screen is improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a side view in cross section 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: the LED display panel comprises a PCB (1), a light-emitting chip (2), a first mask (3), a second mask (4), a first mask hole (5), a second mask hole (6), a first adhesive layer (7) and a second adhesive layer (8).
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1 and 2, a COB display screen for improving black-white contrast and preventing crosstalk and an operation method thereof include a PCB 1, a first panel 3 and a second panel 4, wherein a plurality of light emitting chips 2 are equidistantly mounted on an upper plane of the PCB 1, and the light emitting chips 2 are fixed on the PCB 1 through silver paste. First face guard 3 covers on PCB board 1, second face guard 4 covers on first face guard 3, first face guard 3 and second face guard 4 all adopt high density's aluminum alloy material, have good light-proof effect, have good thermal diffusivity simultaneously. The surface of the first mask is subjected to mirror surface treatment, and the bottom plane of the second mask is subjected to mirror surface treatment, so that the first mask 3 and the second mask 4 can be fixed conveniently; the upper plane of the second mask is subjected to rough surface treatment; the influence of an external light source is reduced.
Be provided with a plurality of first face guard holes 5 and a plurality of second face guard holes 6 on first face guard 3 and the second face guard 4 respectively, first face guard hole 5 and second face guard hole 6 are the one-to-one and lie in same axis, the internal diameter of second face guard hole 6 is less than first face guard hole 5, the inner chamber packing in first face guard hole 5 has first glue film 7, the inner chamber packing in second face guard hole 6 has second glue film 8, first glue film 7 adopts transparent material's epoxy, the epoxy that contains the additive in the second glue film 8 adoption, the additive is nanometer silica, nanometer silica is black or white.
The during operation, light-emitting chip 2 lights, the light that light-emitting chip 2 sent, all inject into first face cover hole 5, 5 inner chamber lateral walls in first face cover hole adopt mirror surface to handle, and the epoxy of transparent material in the first face cover hole 5, complete light transmissivity has, epoxy refracts light, thereby increase the reflection number of times of light, reach the effect of handling to light reciprocal reflection many times, multiple reflection through light makes RGB (red, green, blue) light can the misce bene, thereby make scattered light variegated of going out few, more homogenization, the polarized light of COB display screen has been solved, the problem of cross color.
Second face cover hole 6 is filled with the epoxy who contains the additive, reaches the effect of going the mirrorization to second face cover hole 6, and light is diffuse reflection in second face cover hole 6 for the increase of the visual angle that second face cover hole 6 jetted out has also avoided the directional problem of concentrating the jetting of partial light, thereby improves holistic black and white contrast of display screen and definition.
Example two:
referring to fig. 3, as a further optimization of the first embodiment, on the basis of the first embodiment, the distance between the axial lines of the adjacent mask holes on the first mask 3 and the second mask 4 is designed to be 0.6-0.7 mm. By the design, the axis distance meets the requirement of the minimum LED, so that the light source of the LED particles can be fully utilized, the light loss is reduced, the energy is saved, and the optical performance of the whole display screen is improved.
Example three:
on the basis of the above embodiment, the present invention further provides an operation method of a COB display screen that improves black-white contrast and prevents crosstalk:
1) dispensing treatment: dispensing the upper surface of the PCB board 1, and coating silver adhesive on the upper surface of the PCB board 1, so that the light-emitting chip 2 is fixed on the PCB board 1; the silver colloid has the advantages of electric conduction effect, strong adhesive force and high heat dissipation.
2) Welding operation: welding the electrode of the light-emitting chip 2 on the upper surface of the PCB 1 through ultrasonic welding treatment; guarantee the welding precision, avoid causing the influence to PCB board 1.
3) First pressing operation: covering the first face mask 3 on the PCB board 1, and fixedly laminating the first face mask 3 and the PCB board 1 through glue, wherein the light-emitting chip 2 penetrates through the inner cavity of the first face mask hole 5; the light source of the light emitting chip 2 is ensured to be fully irradiated into the first mask hole 5.
4) The first glue pouring operation: in a vacuum environment, filling epoxy resin into the inner cavity of the first mask hole 5 and infiltrating the mask hole, wherein the epoxy resin is made of a transparent material; epoxy plays anti-oxidation effect to the downthehole comprehensive cover of face guard, avoids face guard hole inner wall oxidation to cause the interference to light, and the epoxy of full transparent material can not influence the luminance of light simultaneously to play the effect of refraction to light, improve the reflection number of times of light.
5) And (3) second pressing operation: covering the second mask 4 on the first mask 3, pressing and fixing the second mask through glue, enabling the second mask holes 6 and the first mask holes 5 to correspond one by one, enabling the second mask holes 6 and the first mask holes 5 to be located on the same axial line, and fixing the second mask 4 on the first mask 3;
6) and (3) glue pouring operation for the second time: in a vacuum environment, epoxy resin is poured into the inner cavity of the second mask hole 6 and permeates the mask hole, the epoxy resin is epoxy resin containing an additive, the additive is nano-scale silicon dioxide, so that the epoxy resin is in an uneven state, and the effect of de-mirrorizing is achieved.
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 an improve COB display screen of black and white contrast and prevent string light, includes PCB board (1), first face guard (3) and second face guard (4), first face guard (3) cover on PCB board (1), second face guard (4) cover on first face guard (3), be provided with a plurality of first face guard holes (5) and a plurality of second face guard holes (6) on first face guard (3) and second face guard (4) respectively, first face guard hole (5) and second face guard hole (6) are the one-to-one and are located same axis, its characterized in that, the inner chamber of first face guard hole (5) is filled with first glue film (7), the inner chamber of second face guard hole (6) is filled with second glue film (8), first glue film (7) adopt the epoxy of transparent material, second glue film (8) adopt the epoxy that contains the additive, the additive is nano-scale silicon dioxide which is black or white.
2. The COB display screen for improving black-white contrast and preventing crosstalk according to claim 1, wherein a plurality of light emitting chips (2) are equidistantly installed on the upper plane of the PCB (1), and the light emitting chips (2) are fixed on the PCB (1) through silver paste.
3. The COB display screen for improving black-white contrast and preventing light crosstalk according to claim 1, wherein the first face mask (3) and the second face mask (4) are made of high-density aluminum alloy.
4. COB display screen for improving black-white contrast and preventing light crosstalk according to claim 3, characterized in that the surface of the first face mask (3) is mirror-finished, the bottom plane of the second face mask (4) is mirror-finished, and the top plane of the second face mask (4) is matte-finished.
5. The COB display screen for improving black-and-white contrast and preventing crosstalk according to claim 1, wherein the second mask hole (6) has a smaller inner diameter than the first mask hole (5).
6. The COB display screen for improving black-and-white contrast and preventing crosstalk according to claim 5, wherein the distance between the axes of the adjacent mask holes is 0.6 to 0.7 mm.
7. An operation method of a COB display screen capable of improving black-white contrast and preventing crosstalk, the operation method comprising the steps of:
1) dispensing treatment: dispensing the upper surface of the PCB (1), and coating silver adhesive on the upper surface of the PCB so as to fix the light-emitting chip (2) on the PCB (1);
2) welding operation: welding the electrode of the light-emitting chip (2) on the upper surface of the PCB (1) through ultrasonic welding treatment;
3) first pressing operation: covering the first face mask (3) on the PCB (1), pressing and fixing the first face mask (3) and the PCB (1) through glue, and enabling the light-emitting chip (2) to penetrate through an inner cavity of the first face mask hole (5);
4) the first glue pouring operation: in a vacuum environment, filling epoxy resin into the inner cavity of the first mask hole (5) and infiltrating the mask hole, wherein the epoxy resin is made of a transparent material;
5) and (3) second pressing operation: covering the second face mask (4) on the first face mask (3), pressing and fixing the second face mask through glue, enabling the second face mask hole (6) and the first face mask hole (5) to correspond one by one, enabling the second face mask hole (6) and the first face mask hole (5) to be located on the same axial line, and fixing the second face mask (4) on the first face mask (3);
6) and (3) glue pouring operation for the second time: and in a vacuum environment, pouring epoxy resin into the inner cavity of the second mask hole (6) and infiltrating the mask hole, wherein the epoxy resin contains an additive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811097622.5A CN110931626B (en) | 2018-09-20 | 2018-09-20 | COB display screen capable of improving black-white contrast and preventing light crosstalk and operation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811097622.5A CN110931626B (en) | 2018-09-20 | 2018-09-20 | COB display screen capable of improving black-white contrast and preventing light crosstalk and operation method thereof |
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| Publication Number | Publication Date |
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| CN110931626A true CN110931626A (en) | 2020-03-27 |
| CN110931626B CN110931626B (en) | 2020-11-20 |
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| CN201811097622.5A Active CN110931626B (en) | 2018-09-20 | 2018-09-20 | COB display screen capable of improving black-white contrast and preventing light crosstalk and operation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113130466A (en) * | 2021-03-26 | 2021-07-16 | 杭州美卡乐光电有限公司 | LED display module and manufacturing method thereof |
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| US20150188004A1 (en) * | 2013-12-27 | 2015-07-02 | Nichia Corporation | Semiconductor light emitting device |
| CN206210838U (en) * | 2016-10-27 | 2017-05-31 | 佛山市国星光电股份有限公司 | A kind of COB display modules |
| CN107403791A (en) * | 2016-05-18 | 2017-11-28 | 光宝光电(常州)有限公司 | Active display and the method for forming active display |
| CN107731121A (en) * | 2017-11-28 | 2018-02-23 | 深圳市秀狐科技有限公司 | A kind of double-deck glue LED display and its processing method |
| CN108182888A (en) * | 2018-03-02 | 2018-06-19 | 深圳市晶台股份有限公司 | A kind of LED display Integral mask based on ink-jet technology |
-
2018
- 2018-09-20 CN CN201811097622.5A patent/CN110931626B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150188004A1 (en) * | 2013-12-27 | 2015-07-02 | Nichia Corporation | Semiconductor light emitting device |
| CN107403791A (en) * | 2016-05-18 | 2017-11-28 | 光宝光电(常州)有限公司 | Active display and the method for forming active display |
| CN206210838U (en) * | 2016-10-27 | 2017-05-31 | 佛山市国星光电股份有限公司 | A kind of COB display modules |
| CN107731121A (en) * | 2017-11-28 | 2018-02-23 | 深圳市秀狐科技有限公司 | A kind of double-deck glue LED display and its processing method |
| CN108182888A (en) * | 2018-03-02 | 2018-06-19 | 深圳市晶台股份有限公司 | A kind of LED display Integral mask based on ink-jet technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113130466A (en) * | 2021-03-26 | 2021-07-16 | 杭州美卡乐光电有限公司 | LED display module and manufacturing method thereof |
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