CN209419916U - A kind of LED charactrons esd protection circuit - Google Patents
A kind of LED charactrons esd protection circuit Download PDFInfo
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- CN209419916U CN209419916U CN201820849450.1U CN201820849450U CN209419916U CN 209419916 U CN209419916 U CN 209419916U CN 201820849450 U CN201820849450 U CN 201820849450U CN 209419916 U CN209419916 U CN 209419916U
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- zener diode
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Abstract
The utility model discloses a kind of LED charactrons esd protection circuits; including forming every a line by connection by LED charactrons, each column have the array of several LED charactrons; several Zener diodes of the input terminal reverse parallel connection of charactron in described every a line; several Zener diodes of the input terminal reverse parallel connection of charactron on each column are bridged by intermediate common wire between the Zener diode.19PCS Zener diode is used only in the utility model design, and peripheral circuit is simple, produces first-pass yield and at low cost；JESD22-A114-B the and ESD STM5.1 standard that is all satisfied, 2 grades of ESDS rank requirements under the static discharge mode (HBM) of charged human body can be effectively ensured between charactron row-row/row-column/Lie-column.
Description
Technical field
The invention belongs to digital electric fields, and in particular to a kind of LED charactrons esd protection circuit.
Background technique
LED charactrons play critically important role in terms of human-computer interaction, have small power consumption, empty calory, impact resistance, longevity
The advantages that life is grown, at low cost, in white domestic appliances, automobile, the fields such as Industry Control have a very wide range of applications.
ESD (Electro-Static Discharge, static discharge) is a kind of common phenomenon for us,
However for electronic product, ESD be often it is fatal-that it may cause component internal wiring is impaired, directly affect product
Normal service life, or even cause the damage of product.
Antistatic (anti-static ability is poor) by LED lamp bead itself between existing LED charactrons row and column, ESD will lead to LED
PN junction array performance occurs reducing or damage, and LED lamp bead back discharge will lead to the damage of LED reverse breakdown, leads to LED charactrons
It fails.This design is unable to satisfy JESD22-A114-B and ESD STM5.1 standard, the static discharge mode of charged human body
(HBM) 2 grades of ESDS rank requirements, ESD voltage threshold classification see the table below under:
Existing market, which improves way, to be protected in one Zener diode in the both ends LED or LED internal parallel, sees Fig. 3.This
The shortcomings that kind of scheme are as follows: 1, in the both ends LED parallel diode, each LED are both needed to one in parallel, and periphery circuit is complicated, at
This height (increases Zener diode cost itself, the manufacturing cost of Zener diode)；2, in one two pole of Zener of LED internal parallel
Pipe, the inside LED plus Zener are at high cost；In addition Zener has Zener side meeting stop portions optical path, causes LED digital close to LED chip
Pipe shows color difference (partially yellow on one side, partially blue on one side).
Summary of the invention
Goal of the invention: in view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of LED charactrons ESD protection
Circuit.
Technical solution: in order to achieve the above object of the invention, what the present invention was specifically performed by: a kind of LED charactrons
Esd protection circuit, including forming every a line by connection by LED charactrons, each column have several LED charactrons
Array, several Zener diodes of input terminal reverse parallel connection of charactron in described every a line, the input of charactron on each column
Several Zener diodes of reverse parallel connection are held, are bridged between the Zener diode by intermediate common wire.
A kind of preferred scheme, 1 Zener diode of input terminal reverse parallel connection of charactron, Mei Yilie in above-mentioned every a line
1 Zener diode of input terminal reverse parallel connection of upper charactron is bridged by intermediate common wire between the Zener diode.
The operation principle of the present invention is that: in the every a line of LED charactrons and each column difference one two pole of Zener of reverse parallel connection
It manages, Zener diode in parallel is bridged with the upper Zener diode in parallel of column by medium line on all rows；Zener diode
VA characteristic curve forward characteristic and general-purpose diode it is similar, when reversely applying electrostatic between column-row, because of Zener
The forward conduction voltage of diode is preferentially flowed through from Zener forward direction far below LED when applying electrostatic；Zener diode
Reverse characteristic be when backward voltage is lower than breakdown reverse voltage, backward resistance is very big, and reverse leakage current is minimum.But when
When backward voltage closes on the critical value of backward voltage, reverse current increases suddenly, referred to as punctures, on this critical breakdown point,
Backward resistance is down to small value suddenly.Although electric current changes within a large range, and the voltage at diode both ends is substantially
Stablize near breakdown voltage, to realize voltage-stabilizing protection function.
The utility model has the advantages that the present invention compared with traditional technology, has the advantage that
1, former design uses 87PCS Zener diode, and 19PCS Zener diode, peripheral circuit letter is used only in innovative design
It is single, produce first-pass yield and at low cost；
2, it can be effectively ensured between charactron row-row/row-column/Lie-column and be all satisfied JESD22-A114-B and ESD
STM5.1 standard, 2 grades of ESDS rank requirements under the static discharge mode (HBM) of charged human body.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of conventional protection circuit；
Fig. 2 is schematic structural view of the invention；
Fig. 3 is the digital protection of pipe figure after tradition improvement.
Specific embodiment
Embodiment 1:
A kind of LED charactrons esd protection circuit, including every a line, Mei Yilie are formed by connection by LED charactrons
There is the array of several LED charactrons, several Zener diodes of the input terminal reverse parallel connection of charactron in described every a line,
Several Zener diodes of the input terminal reverse parallel connection of charactron on each column, by intermediate public between the Zener diode
Line bridges.
Embodiment 2:
LED charactrons esd protection circuit as shown in Figure 2, including by LED charactrons by connection formed every a line,
It is each to arrange the array for having several LED charactrons, 1 two pole of Zener of input terminal reverse parallel connection of charactron in described every a line
It manages, 1 Zener diode of input terminal reverse parallel connection of charactron on each column, by intermediate public between the Zener diode
Line bridges.
Claims (2)
1. a kind of LED charactrons esd protection circuit, including every a line, each column are formed by connection by LED charactrons
There is the array of several LED charactrons, which is characterized in that several of the input terminal reverse parallel connection of charactron is neat in described every a line
Receive diode, several Zener diodes of the input terminal reverse parallel connection of charactron on each column lead between the Zener diode
Intermediate common wire is crossed to bridge.
2. LED charactrons esd protection circuit according to claim 1, which is characterized in that charactron in described every a line
1 Zener diode of input terminal reverse parallel connection, 1 Zener diode of input terminal reverse parallel connection of charactron, described on each column
It is bridged between Zener diode by intermediate common wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820849450.1U CN209419916U (en) | 2018-06-04 | 2018-06-04 | A kind of LED charactrons esd protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820849450.1U CN209419916U (en) | 2018-06-04 | 2018-06-04 | A kind of LED charactrons esd protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209419916U true CN209419916U (en) | 2019-09-20 |
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ID=67929696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820849450.1U Active CN209419916U (en) | 2018-06-04 | 2018-06-04 | A kind of LED charactrons esd protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209419916U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109511194A (en) * | 2018-06-04 | 2019-03-22 | 宜兴市旭航电子有限公司 | A kind of LED charactrons esd protection circuit |
-
2018
- 2018-06-04 CN CN201820849450.1U patent/CN209419916U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109511194A (en) * | 2018-06-04 | 2019-03-22 | 宜兴市旭航电子有限公司 | A kind of LED charactrons esd protection circuit |
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