CN104812137A - Adaptive dimming OLED drive circuit - Google Patents
Adaptive dimming OLED drive circuit Download PDFInfo
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- CN104812137A CN104812137A CN201510213325.2A CN201510213325A CN104812137A CN 104812137 A CN104812137 A CN 104812137A CN 201510213325 A CN201510213325 A CN 201510213325A CN 104812137 A CN104812137 A CN 104812137A
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Abstract
The invention discloses an adaptive dimming OLED drive circuit comprising a controller, a drive circuit and an OLED which are connected sequentially. The controller outputs PWM signals to the drive circuit, a brightness monitoring device is connected between the OLED and the input end of the controller, the loop control is adopted, the brightness of the OLED can be adjusted automatically, and energy is saved.
Description
Technical field
The present invention relates to OLED control circuit field, more particularly, relate to a kind of OLED drive circuit of self adaptation light modulation.
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.
Existing OLED circuit, it adopts the control signal of controller that drive circuit is driven OLED, but regardless of daytime or night, the brightness constancy of OLED, under dim environment, brightness is too high not only bad to human eye, and power consumption is large.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of OLED drive circuit of self adaptation light modulation, and it adopts closed-loop control, realizes Automatic adjusument to the brightness of OLED, energy-conservation.
The present invention's adopted technical scheme that solves the problem is:
An OLED drive circuit for self adaptation light modulation, comprises the controller, drive circuit and the OLED that connect successively, and described controller output pwm signal, to drive circuit, is connected with illuminance monitoring device between described OLED and the input of controller.
The present invention improves on the basis of existing technology, is connected illuminance monitoring device and realizes closed-loop control between OLED and the input of controller, realizes indoor permanent illumination light modulation; Controller output pwm signal is to drive circuit, and utilize the electric current of the mode of pulse modulation light modulation to OLED to regulate, it has advantages such as colour cast can not occurring, light modulation precision is high, dimming scope is wide, do not glimmer, strengthens the illumination performance of OLED.The brightness of illuminance monitoring device to indoor is monitored and sends testing result to controller; controller regulates according to the brightness of room brilliancy to OLED, realizes self adaptation light modulation, under avoiding dim condition; the too high waste caused of OLED lamp brightness, and realize the protection to eyesight.
As preferably, described controller and illuminance monitoring device are all connected with voltage stabilizing circuit, the input of described voltage stabilizing circuit is connected on capacitance-resistance power supply circuits.Utilize voltage stabilizing circuit to carry out voltage stabilizing to controller power supply, ensure the stable operation of controller, also effectively improve the stability of OLED.
Further, described drive circuit comprises chip NCL30160, the CS pin of described chip NCL30160 is connected with the 3rd resistance of ground connection, the ROT pin of chip NCL30160 is connected with the first resistance be in series and the first electric capacity, the not common end ground connection of the first described electric capacity, the VCC pin of chip NCL30160 is connected on the first resistance and the first electric capacity common port, the VIN pin of described chip NCL30160 is connected with the second electric capacity of ground connection, the LX pin of chip NCL30160 is connected with inductance and is connected with the positive pole of diode by the 4th resistance, the negative pole of described diode is connected on VIN pin.The drive circuit of this programme adopts chip NCL30160, and it is a constant-flow driver, and energy consumption is low, volume is little, can reduce space and cost to greatest extent
Further, in order to improve the reliability of circuit, the first described resistor in parallel has the second resistance.
As preferably, described illuminance monitoring device is TSL2561.TSL2561 is the luminous intensity digital translation chip of a high speed, low-power consumption, wide-range, utilizes this chip can provide better brightness and reduce power supply power consumption.It has extra small encapsulation, brings burden can not to the encapsulation of circuit.
To sum up, the invention has the beneficial effects as follows:
1, the present invention is connected illuminance monitoring device and realizes closed-loop control between OLED and the input of controller, realizes indoor permanent illumination light modulation, under avoiding dim condition, and the too high waste caused of OLED lamp brightness, and realize the protection to eyesight.
2, the present invention utilizes the electric current of the mode of pulse modulation light modulation to OLED to regulate, and adopts the mode of pulse modulation light modulation to have advantages such as colour cast can not occurring, light modulation precision is high, dimming scope is wide, do not glimmer, strengthens the illumination performance of OLED.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention.
Fig. 2 is the schematic diagram of drive circuit 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:
The OLED drive circuit of a kind of self adaptation light modulation as shown in Figure 1, comprise the controller, drive circuit and the OLED that connect successively, described controller output pwm signal, to drive circuit, is connected with illuminance monitoring device between described OLED and the input of controller.
Embodiment 2:
The OLED drive circuit of a kind of self adaptation light modulation as shown in Figure 1, the present embodiment is optimized on the basis of above-described embodiment, namely described controller and illuminance monitoring device are all connected with voltage stabilizing circuit, and the input of described voltage stabilizing circuit is connected on capacitance-resistance power supply circuits.
Embodiment 3:
The OLED drive circuit of a kind of self adaptation light modulation as depicted in figs. 1 and 2, the present embodiment is optimized drive circuit on the basis of above-described embodiment, namely described drive circuit comprises chip NCL30160, the CS pin of described chip NCL30160 is connected with the 3rd resistance of ground connection, the ROT pin of chip NCL30160 is connected with the first resistance be in series and the first electric capacity, the not common end ground connection of the first described electric capacity, the VCC pin of chip NCL30160 is connected on the first resistance and the first electric capacity common port, the VIN pin of described chip NCL30160 is connected with the second electric capacity of ground connection, the LX pin of chip NCL30160 is connected with inductance and is connected with the positive pole of diode by the 4th resistance, the negative pole of described diode is connected on VIN pin.
The first described resistor in parallel has the second resistance.
Described illuminance monitoring device is TSL2561.
As mentioned above, the present invention can be realized preferably.
Claims (5)
1. the OLED drive circuit of a self adaptation light modulation, comprise the controller, drive circuit and the OLED that connect successively, it is characterized in that: described controller output pwm signal, to drive circuit, is connected with illuminance monitoring device between described OLED and the input of controller.
2. the OLED drive circuit of a kind of self adaptation light modulation according to claim 1, it is characterized in that: described controller and illuminance monitoring device are all connected with voltage stabilizing circuit, the input of described voltage stabilizing circuit is connected on capacitance-resistance power supply circuits.
3. the OLED drive circuit of a kind of self adaptation light modulation according to claim 1 and 2, it is characterized in that: described drive circuit comprises chip NCL30160, the CS pin of described chip NCL30160 is connected with the 3rd resistance of ground connection, the ROT pin of chip NCL30160 is connected with the first resistance be in series and the first electric capacity, the not common end ground connection of the first described electric capacity, the VCC pin of chip NCL30160 is connected on the first resistance and the first electric capacity common port, the VIN pin of described chip NCL30160 is connected with the second electric capacity of ground connection, the LX pin of chip NCL30160 is connected with inductance and is connected with the positive pole of diode by the 4th resistance, the negative pole of described diode is connected on VIN pin.
4. the OLED drive circuit of a kind of self adaptation light modulation according to claim 3, is characterized in that: the first described resistor in parallel has the second resistance.
5. the OLED drive circuit of a kind of self adaptation light modulation according to claim 1, is characterized in that: described illuminance monitoring device is TSL2561.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510213325.2A CN104812137A (en) | 2015-04-30 | 2015-04-30 | Adaptive dimming OLED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510213325.2A CN104812137A (en) | 2015-04-30 | 2015-04-30 | Adaptive dimming OLED drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN104812137A true CN104812137A (en) | 2015-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510213325.2A Pending CN104812137A (en) | 2015-04-30 | 2015-04-30 | Adaptive dimming OLED drive circuit |
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| CN (1) | CN104812137A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201267029Y (en) * | 2008-08-22 | 2009-07-01 | 比亚迪股份有限公司 | LED street lamp and drive device thereof |
| US20120299511A1 (en) * | 2011-05-26 | 2012-11-29 | Charles J. Montante | Controlling the Light Output of One or More LEDs In Response to the Output of a Dimmer |
-
2015
- 2015-04-30 CN CN201510213325.2A patent/CN104812137A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201267029Y (en) * | 2008-08-22 | 2009-07-01 | 比亚迪股份有限公司 | LED street lamp and drive device thereof |
| US20120299511A1 (en) * | 2011-05-26 | 2012-11-29 | Charles J. Montante | Controlling the Light Output of One or More LEDs In Response to the Output of a Dimmer |
Non-Patent Citations (1)
| Title |
|---|
| 刘珊，宫杰，鲍建宇: "恒照度调光的LED驱动器设计", 《单片机与嵌入式系统应用》 * |
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Application publication date: 20150729 |