CN100405442C - Luminous dipolar body panel driving circuit having electric current compensation function - Google Patents
Luminous dipolar body panel driving circuit having electric current compensation function Download PDFInfo
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- CN100405442C CN100405442C CNB2004100798395A CN200410079839A CN100405442C CN 100405442 C CN100405442 C CN 100405442C CN B2004100798395 A CNB2004100798395 A CN B2004100798395A CN 200410079839 A CN200410079839 A CN 200410079839A CN 100405442 C CN100405442 C CN 100405442C
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Abstract
The present invention provides an LED panel driving circuit with the function of current compensation. Because the LED of the LED panel is in matrix form array, and both the panel and a control switch have line resistance, when the same row of a plurality of LEDs are lighted simultaneously and current sources flow through the same line resistance together, multiple times of voltage drop can be generated on the resistance; the voltage drop on the LED and the current source is reduced, the LED current is reduced and the LED brightness is reduced, so the LED brightness is unsteady. The present invention duplicates a set of LED current source circuit and individually compensates the current decrease of the corresponding LED through an adding circuit, so the LED brightness can be maintained invariant.
Description
Technical field
The present invention refers in particular to the minimizing of compensation LED electric current, the circuit that LED brightness is remained unchanged relevant for the improvement of light emitting diode (LED, Light Emitting Diode) panel drive circuit.
Background technology
The driving circuit of general LED display panel is simplicity of illustration shown in figure one, figure one only illustrates one 8 * 3 LED matrix.Constant current source ISEG sends into eight row LED respectively via switch S EG1, SEG2......SEG8, and eight row LED vertically form three row, connects resistance R 1, R2, R3 (this is resistance on the line, non-entity resistor) and switch COM1, COM2, COM3 separately and ground connection.
When switch COM1 and SEG1, SEG3 formation path, other switches form when opening circuit, and have only LED11, LED31 to pass through electric current and shinny, and other LED then extinguish.The rest may be inferred by analogy.
The electric current that flows through LED is big more, and LED is just bright more.If have a plurality of LED to pass through electric current in the row longitudinally, when these electric currents flow through resistance R 1, R2 or R3 jointly, just go up the voltage drop that produces many multiples at resistance [H3] R1, R2 or R3, therefore more or less push the voltage drop on LED and the current source, the result reduces electric current, the brightness of LED reduces, so the brightness instability of LED.The present generally shortcoming of LED display panel, drive circuit that Here it is.
Summary of the invention
Therefore the present invention's purpose is duplicated a cover LED current source circuit at the LED panel drive circuit that proposes a kind of tool current compensation, sends into corresponding LED via adding circuit, and the electric current of using the corresponding LED of indivedual compensation reduces, thereby keeps the brightness of LED constant.
According to the present invention, a kind of LED panel drive circuit of tool electric current compensation function is provided, comprise a plurality of constant current source ISEG, described a plurality of constant current source ISEG sends into the capable LED of M respectively via switch S EG1, SEG2......SEGM, the capable LED of M vertically forms the N row, connects switch COM1, COM2......COMN separately and ground connection; One ON-OFF control circuit has M bar line, respectively the Push And Release of gauge tap SEG1, SEG2......SEGM; Its feature is as follows:
Comprise a plurality of constant current source IC, described a plurality of constant current source IC send into one first adding circuit respectively via switch COMP1, COMP2......COMPM; The M bar line of this ON-OFF control circuit cooperates the Push And Release of switch S EG1, SEG2......SEGM and controls Push And Release to inductive switch COMP1, COMP2......COMPM simultaneously; And
The output of this first adding circuit then with a constant current source 23 with another second adding circuit addition, deliver to the wherein relevant LED of SEG1, SEG2......SEGM via a constant current source control circuit then.
Description of drawings
Figure one is the synoptic diagram of the driving circuit of general LED display panel.
Figure two is the synoptic diagram of the LED panel drive circuit of tool electric current compensation function of the present invention.
Embodiment
The present invention's embodiment is shown in figure two, and figure two the right are the circuit shown in the figure one, the new design that figure two left sides add for the present invention.The present invention duplicate the constant current source ISEG shown in a figure one via switch S EG1, SEG2......SEG8 send into respectively eight the row LED circuit, be that constant current source IC sends into respectively in the adding circuit 22 via switch COMP1, COMP2......COMP8 but change label.
Gauge tap SEG1, SEG2......SEG8 and allow constant current source ISEG send into respectively eight the row led circuits are the ON-OFF control circuit 21 in the upper left corner, the steering order that its input is promptly extraneous, it is output as eight lines Push And Release of gauge tap SEG1, SEG2......SEG8 respectively.The present invention simultaneously eight lines of ON-OFF control circuit 21 are also linked switch COMP1, COMP2......COMP8 respectively and control its etc. Push And Release, as shown in the figure.Constant current source 23 is the existing person of prior art in the lower left corner.
For example, when the output of ON-OFF control circuit 21 have three lines be to make SEG1, SEG2......SEG8 wherein three switches become path, so make three corresponding among COMP1, COMP2......COMP8 switches also become path simultaneously.Therefore three constant current source IC import adding circuit 22 and addition among COMP1, the COMP2......COMP8, the output of adding circuit 22 then with constant current source 23 with adding circuit 24 additions, at last deliver to three wherein relevant constant current source ISEG of SEG1, SEG2......SEG8 via constant current source control circuit 25.
Therefore originally worked as SEG1, SEG2......SEG8 wherein three switches becomes path, current flowing resistance R1, when R2 or R3, in resistance R 1, R2 or R3 go up the voltage drop that produces triple, voltage drop on the LED is reduced, the result reduces electric current, the brightness of LED reduces, but because the present invention is at the COMP1 of correspondence, three constant current source IC of input among the COMP2......COMP8, thereby compensated SEG1 respectively, SEG2......SEG8 is the electric current of the constant current source ISEG of three paths wherein, this more electric current can keep the brightness of LED constant, and do not need the added logic computing circuit, so reach purpose of the present invention.The value of constant current source IC must carefully be calculated and do experiment and set.
The present invention is not only applicable to general LED panel circuit, is applicable to OLED (OrganicLED) panel circuit yet.OLED is a kind of LED of organic formula, though material therefor is different with general LED, its character of circuit is identical with general LED.
Adding circuit 24 among the figure two of the present invention can replace with subtraction circuit, the electric current that this moment, constant current source 23 was supplied is the electric current of eight LED full loads, when some LED opens circuit, then corresponding switch becomes path on the contrary among COMP1, the COMP2......COMP8, input current to subtraction circuit to deduct described input current from described constant current source 23.
The present invention's spirit and scope only are subject to following claim, are not subject to above-mentioned special case.
Claims (4)
1. the light-emittingdiode LED panel drive circuit of a tool electric current compensation function comprises a plurality of constant current source ISEG, and described a plurality of constant current source ISEG are via switch S EG1, SEG2......
SEGM sends into the capable LED of M respectively, and the capable LED of M vertically forms the N row, connects switch COM1, COM2......COMN separately and ground connection; One ON-OFF control circuit has M bar line, respectively the Push And Release of gauge tap SEG1, SEG2......SEGM; Its feature is as follows:
Comprise a plurality of constant current source IC, described a plurality of constant current source IC send into one first adding circuit respectively via switch COMP1, COMP2......COMPM; The M bar line of this ON-OFF control circuit cooperates the Push And Release of switch S EG1, SEG2......SEGM and controls Push And Release to inductive switch COMP1, COMP2......COMPM simultaneously; And
The output of this first adding circuit then with a constant current source (23) with one second adding circuit addition, deliver to the wherein relevant LED of SEG1, SEG2......SEGM via a constant current source control circuit then.
2. the light-emittingdiode LED panel drive circuit of tool electric current compensation function as claimed in claim 1, wherein this LED is the Organic Light Emitting Diode that a kind of organic material is made, its character of circuit and general LED are identical.
3. the LED panel drive circuit of a tool electric current compensation function, comprise a plurality of constant current source ISEG, described a plurality of constant current source ISEG sends into the capable LED of M respectively via switch S EG1, SEG2......SEGM, the capable LED of M vertically forms the N row, connects switch COM1, COM2......COMN separately and ground connection; One ON-OFF control circuit has M bar line, respectively the Push And Release of gauge tap SEG1, SEG2......SEGM; Its feature is as follows:
Comprise a plurality of constant current source IC, described a plurality of constant current source IC send into one first adding circuit respectively via switch COMP1, COMP2......COMPM; Under this ON-OFF control circuit control, when some LED opened circuit, switch corresponding among COMP1, the COMP2......COMPM was a path; And
Deduct the output of this first adding circuit with a subtraction circuit from a constant current source (23), deliver to the wherein relevant LED of SEG1, SEG2......SEGM via a constant current source control circuit then; Wherein, the electric current supplied of this constant current source (23) is the electric current of M LED full load of row.
4. the LED panel drive circuit of tool electric current compensation function as claimed in claim 3, wherein this LED is the Organic Light Emitting Diode that a kind of organic material is made, its character of circuit and general LED are identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100798395A CN100405442C (en) | 2004-09-23 | 2004-09-23 | Luminous dipolar body panel driving circuit having electric current compensation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100798395A CN100405442C (en) | 2004-09-23 | 2004-09-23 | Luminous dipolar body panel driving circuit having electric current compensation function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1753071A CN1753071A (en) | 2006-03-29 |
| CN100405442C true CN100405442C (en) | 2008-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100798395A Expired - Fee Related CN100405442C (en) | 2004-09-23 | 2004-09-23 | Luminous dipolar body panel driving circuit having electric current compensation function |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5130804B2 (en) * | 2006-10-02 | 2013-01-30 | セイコーエプソン株式会社 | Light emitting device and image forming apparatus |
| CN112261758B (en) * | 2020-11-05 | 2023-04-28 | 西安中颖电子有限公司 | Method for compensating uniformity of LED |
| CN114420060B (en) * | 2022-01-20 | 2023-06-30 | 上海龙旗科技股份有限公司 | MiniLED backlight display device and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000194428A (en) * | 1998-12-28 | 2000-07-14 | Stanley Electric Co Ltd | Driving device and driving method for organic el element |
| US6172701B1 (en) * | 1997-06-30 | 2001-01-09 | Oki Data Corporation | Light emitting element array chip, light emitting element array drive IC and print head |
| US20030122750A1 (en) * | 2001-12-28 | 2003-07-03 | Takashi Tamaki | Display device using light-emitting elements |
| US20040017725A1 (en) * | 2002-07-19 | 2004-01-29 | Celine Mas | Automated adaptation of the supply voltage of a light-emitting display according to the desired luminance |
| CN1482587A (en) * | 2002-07-31 | 2004-03-17 | 精工爱普生株式会社 | Electronic circuit, elecro-optical device, and electronic apparatus |
-
2004
- 2004-09-23 CN CNB2004100798395A patent/CN100405442C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6172701B1 (en) * | 1997-06-30 | 2001-01-09 | Oki Data Corporation | Light emitting element array chip, light emitting element array drive IC and print head |
| JP2000194428A (en) * | 1998-12-28 | 2000-07-14 | Stanley Electric Co Ltd | Driving device and driving method for organic el element |
| US20030122750A1 (en) * | 2001-12-28 | 2003-07-03 | Takashi Tamaki | Display device using light-emitting elements |
| US20040017725A1 (en) * | 2002-07-19 | 2004-01-29 | Celine Mas | Automated adaptation of the supply voltage of a light-emitting display according to the desired luminance |
| CN1482587A (en) * | 2002-07-31 | 2004-03-17 | 精工爱普生株式会社 | Electronic circuit, elecro-optical device, and electronic apparatus |
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| CN1753071A (en) | 2006-03-29 |
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