CN102750897B - Simple test circuit for LED (light emitting diode) display module - Google Patents
Simple test circuit for LED (light emitting diode) display module Download PDFInfo
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- CN102750897B CN102750897B CN201210240956.XA CN201210240956A CN102750897B CN 102750897 B CN102750897 B CN 102750897B CN 201210240956 A CN201210240956 A CN 201210240956A CN 102750897 B CN102750897 B CN 102750897B
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Abstract
The invention relates to a simple test circuit for an LED (light emitting diode) display module, comprising a constant flow source circuit, wherein the constant flow source circuit is connected with a cathode of the LED display module to be tested, a pulse generating circuit is connected with an anode of the LED display module to be tested by a switch circuit, and the constant flow source circuit powers the pulse generating circuit and the switch circuit. The simple test circuit adopts the pulse generating circuit, so that all LEDs can be 'simultaneously' turned on only by setting the frequency of a pulse signal to be more than the frequency (36Hz) which can not be distinguished by human eyes; and the LED display module to be tested is powered by the single constant flow source circuit, and all the LEDs within each region of the LED display module to be tested are accessed into a single constant flow source, so that the electric current passing through each LED can be guaranteed at a fixed value, and testers can quickly find out blind points and judge whether the LED display module to be tested has the phenomenon of uneven luminescence.
Description
Technical field
The present invention relates to a kind of test circuit, especially a kind of simple and easy LED display module test circuit.
Background technology
Along with strictly considering the energy and cost, the charactron be widely used in household electrical appliances display panel is eliminated gradually, the substitute is signify green, efficient light emitting diode (LED).These LED particle or and or be series at circuit, as shown in Figure 1, then reached the display effect of special pattern by software control.
Whether LED is no doubt green, efficient, and a difficult problem is but how LED lights according to the parameter of setting by manufacturer, thus judge blind spot and check luminescence even.LED needs constant current to drive, and its brightness is determined by the electric current by himself, but what easily obtain in laboratory is source of stable pressure, so common way is source of stable pressure resistance in series.For circuit shown in Fig. 1, ABCDEFGH can be connected as negative pole, 12345678 connect as positive pole after resistance in series respectively.Because the parameter of LED is variant, and arrangement mode is different, and 1st district is two LED particle series connection, only there is a LED particle in 2nd district, and have in 1st district and have resistance in series simultaneously, obtain stable constant current source if want like this, just need the resistance of institute of constantly adjustment each district crosstalk resistance, be unfavorable for realizing.Its control procedure can refer to Fig. 2.
Moreover supposition can guarantee by the adjustment of complexity the electric current obtaining anticipation, for above-mentioned circuit, for 1st district, because different diode drops is different, (cause the reason of this phenomenon to have be foozle at two: one, LED wafer can not be completely the same; Other reason is that the LED particle in 1st district may exist color distortion, if 1A is red, 1B is green), the electric current being added in 1st district so just cannot completely mean allocation in each LED particle, the result caused is that brightness is inconsistent or cannot get a desired effect, and makes troubles to the manufacture of product or inspection.
Summary of the invention
The object of the present invention is to provide a kind of LED particle in LED display module can being lighted simultaneously, and the electric current ensureing to flow through each LED particle is the simple and easy LED display module test circuit of the numerical value that user requires.
For achieving the above object, present invention employs following technical scheme: a kind of simple and easy LED display module test circuit, comprise constant-current source circuit, constant-current source circuit is connected with the negative pole of LED display module to be tested, pulse generating circuit is connected by the positive pole of on-off circuit with LED display module to be tested, and constant voltage power supply circuit is powered to pulse generating circuit and on-off circuit.
As shown from the above technical solution, the present invention adopts pulse generating circuit, more than the frequency (36Hz) only the set of frequency of pulse signal cannot need differentiated at human eye, all LED " simultaneously " can be lighted; Single constant-current source circuit is adopted to power to LED display module to be tested, the LED that each region of LED display module to be tested is all accesses single constant current source, thus ensure that the electric current flowing through each LED is fixed value, be convenient to tester and find out blind spot rapidly and judge whether LED display module to be tested exists the phenomenon of non-uniform light.
Accompanying drawing explanation
Fig. 1 is LED display module schematic diagram of the prior art;
Fig. 2 is the source of stable pressure resistance in series test circuit tested the LED display module shown in Fig. 1;
Fig. 3,4,5,6 is circuit theory diagrams of constant-current source circuit in the present invention, pulse generating circuit, on-off circuit, constant voltage power supply circuit.
Embodiment
A kind of simple and easy LED display module test circuit, comprise constant-current source circuit 1, constant-current source circuit 1 is connected with the negative pole of LED display module 5 to be tested, pulse generating circuit 2 is connected with the positive pole of LED display module 5 to be tested by on-off circuit 3, constant voltage power supply circuit 4 is powered to pulse generating circuit 2 and on-off circuit 3, as shown in Fig. 3,4,5,6.
As shown in Figure 3, described constant-current source circuit 1 comprises diode D1, the negative electrode of diode D1 is connected with the anode of diode D2, the negative electrode of diode D2 is connected with one end of resistance R2, the base stage of triode Q1 respectively, the other end of resistance R2, the equal ground connection of collector of triode Q1, the emitter of triode Q1 is connected with one end of resistance R1, receives the negative pole of the LED display module 5 of test after the other end of resistance R1 is connected with the anode of diode D1.Wherein, the size of the electric current of constant-current source circuit 1 output can be realized by the resistance of regulating resistance R1.
As shown in Figure 4, described pulse generating circuit 2 comprises counter U1, it is the 8th years old, 12 pin ground connection, it is the 9th years old, 10, 11 pins respectively with electric capacity C4, resistance R22, one end of resistance R21 is connected, electric capacity C4, resistance R22, the other end of resistance R21 is in parallel, 4 of counter U1, 5, 6, 7 pins respectively with the A of code translator U2, B, C, D pin is connected, the output terminal of described three terminal regulator U3 respectively with the 16th pin of counter U1, the VCC pin of code translator U2 is connected, the 1st of code translator U2, 2, 3, 4, 5, 6, 7, 9, 10, 11 pins are connected with one end of resistance R3 ~ R12 respectively, the other end of resistance R3 ~ R12 is connected with the base stage of triode Q2 ~ Q11 respectively, the grounded emitter of triode Q2 ~ Q11, the collector of triode Q2 ~ Q11 is connected with the input end of on-off circuit 3.
As shown in Figure 6, described constant voltage power supply circuit 4 comprises three terminal regulator U3, and the input termination constant pressure source VCC of three terminal regulator U3, the output terminal of three terminal regulator U3 is connected with on-off circuit 3 with pulse generating circuit 2 respectively.Constant pressure source VCC provide input voltage, + 5V direct current is exported for counter U1 and code translator U2 after three terminal regulator U3 is stable, the alternate conduction signal that code translator U2 sends drives triode Q2 ~ Q11 alternate conduction, like this at a ~ j lead end by pulse voltage anti-phase with it for generation one group, this pulse voltage will be used for driving switch circuit 3.
As shown in Figure 5, described on-off circuit 3 comprises triode Q12, the output terminal of pulse generating circuit 2 is connected with the base stage of triode Q12 by resistance R23, the collector of triode Q12 connects the output terminal of described three terminal regulator U3 by resistance R24, the emitter of triode Q12 is connected with the positive pole of LED display module 5 to be tested.The pulse signal that on-off circuit 3 utilizes pulse generating circuit 2 to send controls turning on and off of triode Q12.
When testing, constant-current source circuit 1 is accessed respectively negative wire end A, B, C, D, E, F, G, H of LED display module 5 to be tested, the positive wire end 1,2,3,4,5,6,7,8 of LED display module 5 to be tested is connected with on-off circuit 3 respectively, another pole of all on-off circuits 3, namely the collector of triode Q12 meets source of stable pressure VCC.
After circuit ON, the on-off circuit 3 that the positive wire end 1,2,3,4,5,6,7,8 of LED display module 5 to be tested connects will be open-minded in turn, the LED in each region of LED display module 5 to be tested also will light in turn, more than the frequency (36Hz) that the set of frequency of pulse signal a, b, c, d, e, f, g, h, l, the j that only pulse generating circuit 2 need be sent cannot be differentiated at human eye, all LED " simultaneously " can be lighted.Because the LED that each region is all accesses single constant-current source circuit 1, thus ensure that the electric current flowing through each LED is fixed value, be convenient to tester and find out blind spot rapidly and judge whether LED display module 5 to be tested exists the phenomenon of non-uniform light.
Claims (4)
1. a simple and easy LED display module test circuit, it is characterized in that: comprise constant-current source circuit (1), constant-current source circuit (1) is connected with the negative pole of LED display module to be tested (5), pulse generating circuit (2) is connected by the positive pole of on-off circuit (3) with LED display module to be tested (5), and constant voltage power supply circuit (4) is to pulse generating circuit (2) and on-off circuit (3) power supply; Described constant-current source circuit (1) comprises diode D1, the negative electrode of diode D1 is connected with the anode of diode D2, the negative electrode of diode D2 is connected with one end of resistance R2, the base stage of triode Q1 respectively, the other end of resistance R2, the equal ground connection of collector of triode Q1, the emitter of triode Q1 is connected with one end of resistance R1, receives the negative pole of the LED display module (5) of test after the other end of resistance R1 is connected with the anode of diode D1.
2. simple and easy LED display module test circuit according to claim 1, it is characterized in that: described constant voltage power supply circuit (4) comprises three terminal regulator U3, the input termination constant pressure source VCC of three terminal regulator U3, the output terminal of three terminal regulator U3 is connected with on-off circuit (3) with pulse generating circuit (2) respectively.
3. simple and easy LED display module test circuit according to claim 2, it is characterized in that: described pulse generating circuit (2) comprises counter U1, it is the 8th years old, 12 pin ground connection, it is the 9th years old, 10, 11 pins respectively with electric capacity C4, resistance R22, one end of resistance R21 is connected, electric capacity C4, resistance R22, the other end of resistance R21 is in parallel, 4 of counter U1, 5, 6, 7 pins respectively with the A of code translator U2, B, C, D pin is connected, the output terminal of described three terminal regulator U3 respectively with the 16th pin of counter U1, the VCC pin of code translator U2 is connected, the 1st of code translator U2, 2, 3, 4, 5, 6, 7, 9, 10, 11 pins are connected with one end of resistance R3 ~ R12 respectively, the other end of resistance R3 ~ R12 is connected with the base stage of triode Q2 ~ Q11 respectively, the grounded emitter of triode Q2 ~ Q11, the collector of triode Q2 ~ Q11 is connected with the input end of on-off circuit (3).
4. simple and easy LED display module test circuit according to claim 2, it is characterized in that: described on-off circuit (3) comprises triode Q12, the output terminal of pulse generating circuit (2) is connected with the base stage of triode Q12 by resistance R23, the collector of triode Q12 connects the output terminal of described three terminal regulator U3 by resistance R24, the emitter of triode Q12 is connected with the positive pole of LED display module to be tested (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210240956.XA CN102750897B (en) | 2012-07-12 | 2012-07-12 | Simple test circuit for LED (light emitting diode) display module |
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| CN201210240956.XA CN102750897B (en) | 2012-07-12 | 2012-07-12 | Simple test circuit for LED (light emitting diode) display module |
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| CN102750897A CN102750897A (en) | 2012-10-24 |
| CN102750897B true CN102750897B (en) | 2015-02-11 |
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| RU2617148C1 (en) * | 2016-02-01 | 2017-04-21 | Федеральное государственное бюджетное учреждение науки Научно-технологический центр микроэлектроники и субмикронных гетероструктур Российской академии наук (НТЦ микроэлектроники РАН) | Led testing method |
Citations (7)
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| JPH11288238A (en) * | 1998-04-03 | 1999-10-19 | Kokusai Electric Co Ltd | Lighting check circuit for led display device |
| TWI265540B (en) * | 2001-07-31 | 2006-11-01 | Eastman Kodak Co | Light emitting flat-panel display |
| CN201504346U (en) * | 2009-08-24 | 2010-06-09 | 东莞彩显有机发光科技有限公司 | OLED illumination lamp or back light source driving controller |
| CN101778510A (en) * | 2010-01-18 | 2010-07-14 | 海洋王照明科技股份有限公司 | LED signal indicator light and multipath LED drive circuits thereof |
| CN102141203A (en) * | 2010-01-29 | 2011-08-03 | 深圳市长运通集成电路设计有限公司 | LED (light emitting diode) light emitting device |
| CN102256421A (en) * | 2011-07-28 | 2011-11-23 | 林万炯 | High-precision multipath LED (light-emitting diode) current-equalizing circuit |
| CN202713752U (en) * | 2012-07-12 | 2013-01-30 | 合肥华耀电子工业有限公司 | Simple LED display module testing circuit |
-
2012
- 2012-07-12 CN CN201210240956.XA patent/CN102750897B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11288238A (en) * | 1998-04-03 | 1999-10-19 | Kokusai Electric Co Ltd | Lighting check circuit for led display device |
| TWI265540B (en) * | 2001-07-31 | 2006-11-01 | Eastman Kodak Co | Light emitting flat-panel display |
| CN201504346U (en) * | 2009-08-24 | 2010-06-09 | 东莞彩显有机发光科技有限公司 | OLED illumination lamp or back light source driving controller |
| CN101778510A (en) * | 2010-01-18 | 2010-07-14 | 海洋王照明科技股份有限公司 | LED signal indicator light and multipath LED drive circuits thereof |
| CN102141203A (en) * | 2010-01-29 | 2011-08-03 | 深圳市长运通集成电路设计有限公司 | LED (light emitting diode) light emitting device |
| CN102256421A (en) * | 2011-07-28 | 2011-11-23 | 林万炯 | High-precision multipath LED (light-emitting diode) current-equalizing circuit |
| CN202713752U (en) * | 2012-07-12 | 2013-01-30 | 合肥华耀电子工业有限公司 | Simple LED display module testing circuit |
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