CN104809981A - OLED (organic light emitting diode) driving circuit - Google Patents
OLED (organic light emitting diode) driving circuit Download PDFInfo
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- CN104809981A CN104809981A CN201510213321.4A CN201510213321A CN104809981A CN 104809981 A CN104809981 A CN 104809981A CN 201510213321 A CN201510213321 A CN 201510213321A CN 104809981 A CN104809981 A CN 104809981A
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- oled
- driving circuit
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- photoelectrical coupler
- phase inverter
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Abstract
The invention discloses an OLED (organic light emitting diode) driving circuit. The OLED driving circuit is characterized by comprising a photoelectric coupler and a phase inverter. An anode pin of the photoelectric coupler and a collector pin used for driving OLED are connected with a pull-up resistor and an emitter pin is grounded; the output end of the phase inverter is connected with a cathode pin of the photoelectric coupler. The OLED driving circuit solves the problem that OLED display is disordered due to switch delay in the prior art.
Description
Technical field
The present invention relates to OLED field, particularly, relate to a kind of OLED driving circuit.
Background technology
OLED and Organic Light Emitting Diode, basic structure is by the indium tin oxide of a thin and transparent tool characteristic of semiconductor, is connected, adds another metallic cathode, be bundled into the structure as sandwich with the positive pole of electric power.Include in total layer: hole transmission layer (HTL), luminescent layer (EL) and electron transfer layer (ETL).When supplying power to appropriate voltage, positive pole hole and negative electrode electric charge will combine in luminescent layer, produce light, produce red, green and blue RGB three primary colors, form basic color according to its formula is different.The characteristic of OLED is that therefore visibility and brightness are all high in oneself luminescence, is secondly that voltage requirements is low and power saving efficiency is high, and add that reaction is fast, lightweight, thickness is thin, simple structure, cost is low, is regarded as one of product of 21 century most future.
Single-chip microcomputer is generally adopted to control to OLED.Single-chip microcomputer input signal power is little, is not enough to Direct driver OLED, and adopt driving circuit to drive OLED, existing driving circuit generally adopts relay.But because the switching delay time of relay is long, make sheet select and send data not mate, make the display of OLED very chaotic.
Summary of the invention
The invention provides a kind of OLED driving circuit, solve the problem that the display of the OLED that the time delay of prior art breaker in middle causes is very chaotic.
The present invention's adopted technical scheme that solves the problem is:
A kind of OLED driving circuit, it is characterized in that: comprise photoelectrical coupler and phase inverter, the ANODE pin of described photoelectrical coupler and be all connected with pull-up resistor and EMITTER pin ground connection on the COLLECTOR pin of driving OLED, the output terminal of described phase inverter is connected on the CATHODE pin of photoelectrical coupler.
Driving circuit of the present invention its directly select photoelectrical coupler to realize conversion to voltage, the input end of phase inverter connects the signal output part of single-chip microcomputer, when single-chip microcomputer exports high level, photoelectrical coupler work, its EMITTER pin output low level; Otherwise during single-chip microcomputer output low level, the light emitting diode cut-off of photoelectrical coupler, EMITTER pin exports high level and drives OLED.The present invention adopts photoelectrical coupler not only can change voltage, also has other advantages: due to its one-way, can isolate signal, and make the electric current of single-chip microcomputer end and OLED end separate, the interference suffered by reduction system, improves reliability.Phase inverter is adopted to carry out oppositely, to strengthen driving force to the output signal of single-chip microcomputer.Because photoelectrical coupler is drives type device, OLED conducting can be made luminous by enough large electric current, input signal is too little, can not driving OLED conducting, makes to export distortion, adopts phase inverter, to strengthen its driving force, reduce the problem exporting distortion.The operation that the pull-up resistor that the ANODE pin of photoelectrical coupler connects is not only chip provides suitable voltage, also plays metering function, avoids the operation of big current on photoelectrical coupler to bring impact, the effective stable operation ensureing circuit.Whole driving circuit adopts photoelectrical coupler to realize, and it does not exist the problem of switch time delay, effectively solves the problem that OLED display is chaotic.
As preferably, in order to further improve the performance of driving circuit, described photoelectrical coupler is TLP521-1.
As preferably, described phase inverter is 7406.
To sum up, the invention has the beneficial effects as follows:
1, the present invention adopts the conversion of photoelectrical coupler realization to voltage, and utilizes phase inverter to carry out oppositely to the output signal of single-chip microcomputer, to improve the driving force of circuit, effectively solves the problem that the display of the OLED that switch time delay causes is very chaotic.
2, circuit structure of the present invention is simple, is easy to realize.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1:
A kind of OLED driving circuit as shown in Figure 1, it is characterized in that: comprise photoelectrical coupler and phase inverter, the ANODE pin of described photoelectrical coupler and be all connected with pull-up resistor and EMITTER pin ground connection on the COLLECTOR pin of driving OLED, the output terminal of described phase inverter is connected on the CATHODE pin of photoelectrical coupler.COLLECTOR pin is connected to the positive pole of OLED, the minus earth of OLED.
The present embodiment only can effectively drive OLED when single-chip microcomputer output low level.
Namely the ANODE pin of photoelectrical coupler, CATHODE pin, EMITTER pin, COLLECTOR pin are respectively 1 pin, 2 pins, 3 pins, 4 pins of chip.
Embodiment 2:
A kind of OLED driving circuit as shown in Figure 1, the present embodiment has done refinement on the basis of above-described embodiment, namely discloses one group of concrete embodiment, and namely described photoelectrical coupler is TLP521-1.Described phase inverter is 7406, and the pull-up resistor on the ANODE pin of photoelectrical coupler and COLLECTOR pin can adopt 100 ohm and 1000 ohm respectively.
TLP521-1 is low-voltage Small current control high-voltage large current, its low price, and current transfer ratio is high, effectively can improve driveability.
In order to improve the corresponding speed of OLED, can on OLED an electric capacity in parallel.
As mentioned above, the present invention can be realized preferably.
Claims (3)
1.OLED driving circuit, it is characterized in that: comprise photoelectrical coupler and phase inverter, the ANODE pin of described photoelectrical coupler and be all connected with pull-up resistor and EMITTER pin ground connection on the COLLECTOR pin of driving OLED, the output terminal of described phase inverter is connected on the CATHODE pin of photoelectrical coupler.
2. OLED driving circuit according to claim 1, is characterized in that: described photoelectrical coupler is TLP521-1.
3. OLED driving circuit according to claim 1, is characterized in that: described phase inverter is 7406.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510213321.4A CN104809981A (en) | 2015-04-30 | 2015-04-30 | OLED (organic light emitting diode) driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510213321.4A CN104809981A (en) | 2015-04-30 | 2015-04-30 | OLED (organic light emitting diode) driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104809981A true CN104809981A (en) | 2015-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510213321.4A Pending CN104809981A (en) | 2015-04-30 | 2015-04-30 | OLED (organic light emitting diode) driving circuit |
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| CN (1) | CN104809981A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060220581A1 (en) * | 2001-09-21 | 2006-10-05 | Semiconductor Energy Laboratory Co., Ltd. | Light Emitting Device, Driving Method of Light Emitting Device and Electronic Device |
| CN101097680A (en) * | 2006-06-30 | 2008-01-02 | Lg.菲利浦Lcd株式会社 | Organic light-emitting diode display device and driving method thereof |
| KR20080082820A (en) * | 2007-03-09 | 2008-09-12 | 엘지디스플레이 주식회사 | Organic light emitting diode display and driving method thereof |
| CN102542983A (en) * | 2010-12-22 | 2012-07-04 | 乐金显示有限公司 | Organic light emitting diode display |
| CN204256983U (en) * | 2014-12-08 | 2015-04-08 | 厦门艾通信息科技有限公司 | A kind of traffic signal light fault testing circuit |
-
2015
- 2015-04-30 CN CN201510213321.4A patent/CN104809981A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060220581A1 (en) * | 2001-09-21 | 2006-10-05 | Semiconductor Energy Laboratory Co., Ltd. | Light Emitting Device, Driving Method of Light Emitting Device and Electronic Device |
| CN101097680A (en) * | 2006-06-30 | 2008-01-02 | Lg.菲利浦Lcd株式会社 | Organic light-emitting diode display device and driving method thereof |
| KR20080082820A (en) * | 2007-03-09 | 2008-09-12 | 엘지디스플레이 주식회사 | Organic light emitting diode display and driving method thereof |
| CN102542983A (en) * | 2010-12-22 | 2012-07-04 | 乐金显示有限公司 | Organic light emitting diode display |
| CN204256983U (en) * | 2014-12-08 | 2015-04-08 | 厦门艾通信息科技有限公司 | A kind of traffic signal light fault testing circuit |
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Application publication date: 20150729 |