CN203858315U - PIN short circuit detection device of LED backlight module group - Google Patents
PIN short circuit detection device of LED backlight module group Download PDFInfo
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- CN203858315U CN203858315U CN201420175899.6U CN201420175899U CN203858315U CN 203858315 U CN203858315 U CN 203858315U CN 201420175899 U CN201420175899 U CN 201420175899U CN 203858315 U CN203858315 U CN 203858315U
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- 238000001514 detection method Methods 0.000 title abstract description 6
- 239000000523 sample Substances 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 230000007704 transition Effects 0.000 description 6
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Abstract
The utility model provides a PIN short circuit detection device of an LED backlight module group. The PIN short circuit detection device comprises a power supply, an interface circuit, a change-over switch circuit and a detection circuit. One power output port of the power supply is controlled to output a high level, and other power output ports output low levels; an LED cathode of a certain independent loop of the LED backlight module group to be detected is connected to the high level, and other LED cathodes are connected to the low levels; a change-over switch is switched to sample the LED cathodes connected to the lower levels; if a high level exists in the sampled independent loops, it is determined that PIN short circuit exists; and if the LED cathodes of the independent loops are all connected to high levels, and high level is not detected in the loop connected to the low level, it is determined that PIN short circuit does not occur in the LED backlight module group. Technical scheme of the utility model is simple and reliable, existence of short circuit among any independent loops can be tested, and the PIN short circuit detection device is low in cost and high in efficiency.
Description
Technical field
The utility model relates to LED-backlit module production field, is specifically related to the pick-up unit of short circuit between LED-backlit module PIN.
Background technology
At present backlight module assembling production firm when assembling is backlight usually because LED lamp bar deficient purchase, bad, the artificial assembly failure of wire rod, cause the lamp bar of original independent loop to have the possibility of mutual short circuit, under normal circumstances, by human eye, observe examination can't find the bad of this class problem.Prior art can only solve the bad problem that has short circuit between adjacent two independent loops.Can not solve any independent loop short circuit problem.
Utility model content
In order to overcome the problems referred to above, the utility model discloses the pick-up unit of short circuit between a kind of LED-backlit module PIN.
The concrete technical scheme that the utility model adopts is, short-circuit detecting device between a kind of LED-backlit module PIN, and between described LED-backlit module PIN, short-circuit detecting device comprises:
Power supply, it contains at least two power outputs, and described each power output all can be exported high level or low level, and can between high level and low level, switch;
Interface circuit, be provided with equal to or greater than the INPUT end of described power output quantity and hold the OUTPUT end of corresponding connection one by one with described INPUT, described INPUT end is electrically connected to one to one with described power output respectively, described OUTPUT end is connected one to one for the LED negative pole one end in the independent LED loop of the LED-backlit module with to be detected, simultaneously with the change-over switch input end corresponding electrical connection one by one of switching switch circuit;
Switching switch circuit, be provided with the change-over switch input end that quantity is equal to or greater than described OUTPUT port number, also be provided with a road change-over switch output terminal, described switching switch circuit makes arbitrary one in change-over switch input end to be communicated with described change-over switch output terminal by switching, and all the other change-over switch input ends all disconnect with described switching output terminal;
Testing circuit, is connected with described change-over switch output terminal, for verifying that described change-over switch output terminal output is high level or low level.
Further, between described power output and described INPUT end, be in series with diode, the positive pole of described diode connects power output, and its negative pole connects INPUT end.
Further, described interface circuit OUTPUT end is provided with for the LED negative pole one end in the independent LED loop of LED-backlit module to be detected is communicated with to the also coupling arrangement of locking with OUTPUT end, described coupling arrangement comprises movable compressing tablet and snap close, locking or throw off described snap close and described compressing tablet is compressed or unclamp described LED negative pole one end line row.
Further, described in each, OUTPUT end is a projection, and the top of described projection is provided with three probes of product word arrangement.
Further, described in each, OUTPUT end is a groove, described compressing tablet corresponding described in each the position of groove be equipped with a raised line, the top of described raised line is provided with three probes or the two row probes of product word arrangement.
By an output high level in the power output of control power supply, all the other keep low level, the LED negative pole access high level of a certain independent loop in the LED-backlit module that makes to accept to detect, one is low level, now by switching cross bar switch, the low level LED negative pole of all accesses is sampled, if sample in these independent loops and have high level, be judged to be and have PIN short circuit, when the LED of all independent loops negative pole all accessed high level, and in the low level loop of access, high level do not detected, judge that the LED-backlit module of accepting to detect is without short circuit between PIN.The utility model scheme is simple and reliable, can test between any independent loop whether have short circuit, is a kind of technical scheme of low-cost high-efficiency.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of short-circuit detecting device between a kind of LED-backlit module of the utility model PIN.
Wherein the implication of each mark is:
1, power supply 2, interface circuit 3, switch transition switch 4, testing circuit 5, LED-backlit module 6, diode 7, current-limiting resistance
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, a kind of embodiment wherein, short-circuit detecting device between a kind of LED-backlit module PIN, it is example that the present embodiment be take the LED-backlit module of testing 8 independent loops, between described LED-backlit module PIN, short-circuit detecting device comprises:
Power supply 1, it contains 8 power outputs, and described each power output all can be exported high level or low level, and can between high level and low level, switch.
Interface circuit 2, be provided with 10 INPUT ends and (in the present embodiment, used totally 8 ports of 3-10 wherein, therefore, 8 INPUT end also can be only set) and with in described INPUT end No. 3-10 totally 8 INPUT ends one by one the OUTPUT of corresponding connection hold, described INPUT end is electrically connected to one to one with described power output respectively, and described OUTPUT holds the change-over switch input end corresponding electrical connection one by one with switching switch circuit 3; The LED negative pole one end in the independent LED loop of LED-backlit module 5 to be detected is connected respectively to one to one to OUTPUT end simultaneously.
Above-mentioned switching switch circuit 3, be provided with 8 change-over switch input ends, also be provided with a road change-over switch output terminal, described switching switch circuit 3 makes arbitrary one in change-over switch input end to be communicated with described change-over switch output terminal by switching, and all the other change-over switch input ends all disconnect with described switching output terminal;
Testing circuit 4, is connected with described change-over switch output terminal, for verifying that described change-over switch output terminal output is high level or low level.
Between described power output and described INPUT end, be in series with diode 6, the positive pole of described diode 6 connects power output, and its negative pole connects INPUT end.Be used for preventing when causing power supply short circuit between LED-backlit module 5PIN during short circuit.
Detecting step is:
1. control power supply 1 and make IO0 power output end output high level, IO1-IO7 power output end keeps low level, open testing circuit 4 and prepare to detect the magnitude of voltage of change-over switch output terminal, by switch transition switch 3, make to be communicated to one by one change-over switch output terminal corresponding to 8 paths of LEDs negative poles of IO0-IO7 power output end, with testing circuit 4, detect one by one its magnitude of voltage, now, first the loop corresponding to IO0 should be high level, if there is high level in other 7 independent loops that sample except the loop corresponding to IO0, be judged to be and have PIN short circuit, sound and light alarm is provided if desired.
If 2. sample except the current negative pole corresponding to other 7 independent loops IO0 mouth be all low level, show all not have short circuit between PIN corresponding to LED loop and other any loops of IO0 power output end, now power output end IO0 mouth is placed in to low level, put next power output as IO1 mouth be high level, continuation is sampled to 8 paths of LEDs negative poles, if sampled, there is high level except other 7 independent loops to high level, be judged to be and have PIN short circuit, on the contrary repeating step 2.
3. when 8 independent loops are exported high level in turn, by switch transition switch 3, after 8 paths of LEDs negative poles are sampled, discovery, except other 7 the independent IO loops to high level IO are all low levels, represents that this test is without short circuit between PIN.
The utility model scheme is simple and reliable, can test between any independent loop whether have short circuit, is a kind of technical scheme of low-cost high-efficiency.
At side circuit, in order to control measuring current in the scope of safety, conventionally can add current-limiting resistance 7, this also can be incorporated in power supply 1, or directly uses other electric current and voltage tunable arrangements such as constant current source.
Technique scheme, can test two independent loops, three independent loops ... arbitrarily between most amounts any loop of independent loop, whether there is short circuit between PIN, only need to increase power supply, interface circuit, interface quantity that switch transition switch is corresponding.
Wherein power supply also can only provide a high level output end, a reverse switch transition switch is set between output terminal and interface circuit, by this switch transition switch, can make power supply be connected to the input end of an arbitrary interface circuit, other input ends of interface circuit are unsettled or connect low level or ground connection.
For more convenient detecting, described interface circuit OUTPUT end is provided with for the LED negative pole one end in the independent LED loop of LED-backlit module to be detected is communicated with to the also coupling arrangement of locking with OUTPUT end, described coupling arrangement comprises movable compressing tablet and snap close, locking or throw off described snap close and described compressing tablet is compressed or unclamp described LED negative pole one end line row.During detection, only need to open snap close, LED-backlit module LED negative pole one end line is discharged under compressing tablet, make each LED negative pole corresponding one by one with OUTPUT end, then lock snap close, make compressing tablet compress line row, make each LED negative pole and OUTPUT hold corresponding and reliable connected one by one, then can start the detecting step in repetition above-described embodiment.
In order to make each LED negative pole and the corresponding and connection more reliably one by one of OUTPUT end, described in each, OUTPUT end is a projection, and the top of described projection is provided with three probes of product word arrangement.Like this, three probes that product shape is arranged can tightly withstand LED negative outside wire, even if line row's insulation course is not also peeled away, probe also can insulation-piercing layer, and it is reliably electrically connected to.
Or OUTPUT end is a groove described in each, described compressing tablet corresponding described in each the position of groove be equipped with a raised line, the top of described raised line is provided with three probes or row or two row probes of product word arrangement.The effect of probe as previously mentioned.Said structure is by word easy to understand, and those skilled in the art can implement this scheme by text description.Therefore accompanying drawing is not provided.
By an output high level in the power output of control power supply, all the other keep low level, the LED negative pole access high level of a certain independent loop in the LED-backlit module that makes to accept to detect, one is low level, now by switching cross bar switch, the low level LED negative pole of all accesses is sampled, if sample in these independent loops and have high level, be judged to be and have PIN short circuit, when the LED of all independent loops negative pole all accessed high level, and in the low level loop of access, high level do not detected, judge that the LED-backlit module of accepting to detect is without short circuit between PIN.The utility model scheme is simple and reliable, can test between any independent loop whether have short circuit, is a kind of technical scheme of low-cost high-efficiency.
Claims (5)
1. a short-circuit detecting device between LED-backlit module PIN, is characterized in that, between described LED-backlit module PIN, short-circuit detecting device comprises:
Power supply, it contains at least two power outputs, and described each power output all can be exported high level or low level, and can between high level and low level, switch;
Interface circuit, be provided with equal to or greater than the INPUT end of described power output quantity and hold the OUTPUT end of corresponding connection one by one with described INPUT, described INPUT end is electrically connected to one to one with described power output respectively, described OUTPUT end is connected one to one for the LED negative pole one end in the independent LED loop of the LED-backlit module with to be detected, simultaneously with the change-over switch input end corresponding electrical connection one by one of switching switch circuit;
Switching switch circuit, be provided with the change-over switch input end that quantity is equal to or greater than described OUTPUT port number, also be provided with a road change-over switch output terminal, described switching switch circuit makes arbitrary one in change-over switch input end to be communicated with described change-over switch output terminal by switching, and all the other change-over switch input ends all disconnect with described switching output terminal;
Testing circuit, is connected with described change-over switch output terminal, for verifying that described change-over switch output terminal output is high level or low level.
2. short-circuit detecting device between LED-backlit module PIN according to claim 1, is characterized in that, between described power output and described INPUT end, is in series with diode, and the positive pole of described diode connects power output, and its negative pole connects INPUT end.
3. short-circuit detecting device between LED-backlit module PIN according to claim 2, it is characterized in that, described interface circuit OUTPUT end is provided with for the LED negative pole one end in the independent LED loop of LED-backlit module to be detected is communicated with to the also coupling arrangement of locking with OUTPUT end, described coupling arrangement comprises movable compressing tablet and snap close, locking or throw off described snap close and described compressing tablet is compressed or unclamp described LED negative pole one end line row.
4. short-circuit detecting device between LED-backlit module PIN according to claim 2, is characterized in that, described in each, OUTPUT end is a projection, and the top of described projection is provided with three probes of product word arrangement.
5. short-circuit detecting device between LED-backlit module PIN according to claim 3, it is characterized in that, described in each, OUTPUT end is a groove, described compressing tablet corresponding described in each the position of groove be equipped with a raised line, the top of described raised line is provided with three probes or the two row probes of product word arrangement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420175899.6U CN203858315U (en) | 2014-04-11 | 2014-04-11 | PIN short circuit detection device of LED backlight module group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420175899.6U CN203858315U (en) | 2014-04-11 | 2014-04-11 | PIN short circuit detection device of LED backlight module group |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203858315U true CN203858315U (en) | 2014-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420175899.6U Expired - Lifetime CN203858315U (en) | 2014-04-11 | 2014-04-11 | PIN short circuit detection device of LED backlight module group |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111223428A (en) * | 2020-01-15 | 2020-06-02 | 精电(河源)显示技术有限公司 | Detection circuit and method for adjacent PIN micro short circuit of COG module |
-
2014
- 2014-04-11 CN CN201420175899.6U patent/CN203858315U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111223428A (en) * | 2020-01-15 | 2020-06-02 | 精电(河源)显示技术有限公司 | Detection circuit and method for adjacent PIN micro short circuit of COG module |
| CN111223428B (en) * | 2020-01-15 | 2023-07-04 | 精电(河源)显示技术有限公司 | Detection circuit and method for adjacent PIN micro-short circuit of COG module |
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| C14 | Grant of patent or utility model | ||
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Address after: 215000 No. 18 Weiwen Road, Suzhou Industrial Park, Suzhou City, Jiangsu Province Patentee after: HIDEAME ELECTRONIC TECHNOLOGY (SUZHOU) Co.,Ltd. Address before: 215000 No. 18 Weiwen Road, Suzhou Industrial Park, Suzhou City, Jiangsu Province Patentee before: SUZHOU INDUSTRIAL PARK HIDEA MECHATRONICS TECHNOLOGY Co.,Ltd. |