CN102118904A

CN102118904A - LED illuminating system and control method thereof

Info

Publication number: CN102118904A
Application number: CN2009103129117A
Authority: CN
Inventors: 赖志成
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2009-12-31
Filing date: 2009-12-31
Publication date: 2011-07-06
Anticipated expiration: 2029-12-31
Also published as: CN102118904B

Abstract

The invention relates to an LED illuminating system comprising an LED light-emitting circuit, a driver and a control circuit, wherein the driver is connected with the LED light-emitting circuit and used for driving the LED light-emitting circuit to work; the LED light-emitting circuit comprises a plurality of LED units which are mutually connected in parallel; the driver comprises a detector; the control circuit comprises a controller connected with the driver; the detector detects the output state of the driver and sends a detection result to the controller; the controller compares the detection result generated by the detector with a preset value to judge whether to send a scanning command to the driver or not; and the driver receives the scanning command, and then scans each LED unit of the LED light-emitting circuit to obtain the position information of abnormal LED units, and returns the position information to the controller. The LED illuminating system has the advantage of higher work stability. The invention also provides a control method of the LED illuminating system.

Description

LED illuminator and control method thereof

Technical field

The present invention relates to a kind of illuminator and illumination control method, relate in particular to a kind of LED illuminator and control method thereof.

Background technology

Now, (Light Emitting Diode LED) has been widely used in the LCD light-emitting diode, as Backlight For Liquid Crystal Display Panels.Because LED has little power consumption, the luminous efficiency height, and discard advantages such as afterwards pollution-free, be present comparatively desirable Backlight For Liquid Crystal Display Panels material.

The LED-backlit source is generally the light source group that a plurality of led light sources are formed by series connection or parallel way.For in-line LED-backlit source, because each led light source is all gone here and there on the same line road, if the class that wherein has a led light source that for example short circuit takes place or open circuit is unusual, the LED on the whole piece circuit will take place unusually so, thereby influence the operate as normal of LCD.In addition, because it is unusual to learn that concrete which led light source takes place, so malfunction elimination is very difficult.

Summary of the invention

In view of this, be necessary to provide a kind of job stability higher, and can investigate the LED illuminator and the LED illumination control method of fault automatically.

A kind of LED illuminator comprises the LED illuminating circuit and links to each other with the LED illuminating circuit and in order to the driver of driving LED illuminating circuit work.The LED illuminating circuit is made of a plurality of LED unit parallel with one another.Driver also comprises detector.The LED illuminator also comprises control circuit.Control circuit comprises the controller that links to each other with driver.Detector detects the output state of driver, and testing result is sent to controller.Controller is compared the testing result that detector produces to judge whether sending scan instruction to driver with a preset value.Driver receives that each the LED unit to the LED illuminating circuit scans after the scan instruction, obtaining occurring the positional information of unusual LED unit, and positional information is returned to controller.

A kind of LED illumination control method, it uses above-mentioned LED illuminator, and it comprises the steps: to set the preset value of the output signal of driver; This detector sends to this controller with the real output signal of this driver; This controller is compared this real output signal with this preset value, when this real output signal and this preset value were unequal, this detector sent one scan and instructs to this driver; This driver receives that each the LED unit to this LED illuminating circuit scans after this scan instruction, obtaining occurring the positional information of unusual LED unit, and this positional information is returned to this controller.

Parallel with one another between the LED unit of above-mentioned LED illuminator, so the operate as normal that can't influence other LED unit unusually of one of them LED unit, job stability improved.In addition, above-mentioned LED illuminator can detect the position of the LED unit that unusual condition takes place automatically.

Description of drawings

Fig. 1 is the principle module diagram of the LED illuminator of the embodiment of the invention, and this LED illuminator comprises control circuit, driver and LED illuminating circuit.

Fig. 2 is the circuit theory diagrams of driver shown in Figure 1 and LED illuminating circuit.

Fig. 3 is the flow chart of the LED illumination control method of the embodiment of the invention.

The main element symbol description

The LED illuminator	100
		The LED illuminating circuit	10
The LED unit	11
		Driver	20
Anodal pin	21a、21b、21c
		The negative pole pin	23a、23b、23c
Input pin
		22
Output pin			24
	Detector	25
Control circuit			30
	Controller	31

Embodiment

Below in conjunction with drawings and embodiments LED illuminator of the present invention and control method thereof are done concrete the introduction.

See also Fig. 1, the LED illuminator 100 of the embodiment of the invention comprises LED illuminating circuit 10, driver 20 that links to each other with LED illuminating circuit 10 and the control circuit 30 that links to each other with driver 20.

See also Fig. 2, but the work of driver 20 driving LED illuminating circuits 10, and it comprises N anodal pin two 1a, 21b, 21c, N

negative pole pin

23a, 23b and 23c, an input pin 22 and an output pin 24.Input pin 22 is used for the control signal that reception control circuit 30 is sent.LED illuminating circuit 10 comprises N ²Individual independently LED unit 11.In the present embodiment, N equals 3.These nine LED unit 11 are arranged in 3 (3 matrix, and on Fig. 2, use L respectively ₁₁, L ₁₂And L ₃₃Come mark.The positive pole of three LED unit 11 of each horizontally-arranged links to each other by lead, and links to each other with one of them anodal pin of driver 20.The negative pole of three LED unit 11 of each file links to each other by lead, and links to each other with one of them negative pole pin of driver 20.Thus, these nine LED unit 11 are state in parallel between any two.During operate as normal, driver 20 is exported a normal voltage between all anodal pins and negative pole pin, to drive these nine LED unit 11 operate as normal simultaneously.

Driver 20 also comprises detector 25.Detector 25 is used to detect the output signal of driver 20, for example current value or magnitude of voltage, and testing result can be sent to control circuit 30.In the present embodiment, the analog signal that detector 25 will detect gained is converted into digital signal after send to controller 31 by output pin 24 by a D/A converter module (figure does not show).

Please consult Fig. 1 once more, control circuit 30 comprises the controller 31 that links to each other with driver 20.Controller 31 is compared the testing result of detector 25 generations with a default value, to judge whether sending the one scan instruction to driver 20.After driver 20 receives this scan instruction, begin each LED unit of LED illuminating circuit 10 is scanned, obtaining occurring the positional information of unusual LED unit, and positional information is returned to controller 31.

See also Fig. 3, the control method of the LED illuminator 100 of the embodiment of the invention comprises the steps:

S101, the preset value of the output signal of 20 pairs of LED illuminating circuits 10 of setting driver.This output signal can be current value or magnitude of voltage.This preset value can be thought a definite value, also can be an interval value.

S102, control circuit 30 enters normal mode of operation.This moment, controller 31 sent control signal, and Control Driver 20 is so that LED illuminating circuit 10 is started working.At this moment, detector 25 sends to controller 31 in real time with the real output signal of driver 20.

S103, detector 25 is compared the real output signal of driver 20 with this preset value, when this real output signal equates with this preset value or falls in this preset value, return step S102.When the one or more LED unit in the LED illuminating circuit 10 opens circuit or during short circuit, voltage or current value that driver 20 is exported to this unusual LED unit will occur unusually.Unequal or when not falling in this preset value when this real output signal and this preset value, then enter step S104.

S104, controller 31 sends one scan and instructs to driver 20.

S105 after driver 20 is received this scan instruction, scans each the LED unit 11 in the LED illuminating circuit 10, and scanning result is returned to controller 31.

Please consult Fig. 2 once more.In the present embodiment, after applying a normal voltage between each anodal pin two 1a, 21b and 21c and each

negative pole pin

23a, 23b and the 23c, detector 25 detects the current value of each pin of flowing through respectively to driver 20 successively.Because the positive and negative polarities of each LED unit 11 and the positive and negative pin that driver 20 is connected are all inequality with 11 the connecting leg pin in other LED unit, therefore can determine it specifically is which LED unit takes place unusually at an easy rate.For instance, if find that the electric current between anodal pin two 1a and the negative pole pin 23c is zero, then explanation is labeled as L ₁₁LED unit 11 open circuit.If find anodal pin two 1 not and the electric current between the negative pole pin 23 bigger, then explanation is labeled as L ₂₂LED unit 11 be short-circuited.

When using the LED illuminator 100 of the embodiment of the invention, because it is parallel with one another between the LED unit 11, therefore the operate as normal that can't influence other LED unit 11 unusually of one of them LED unit 11, but and fast detecting go out the position of unusual LED unit, improved job stability.

Be appreciated that, the quantity of the LED unit 11 that LED illuminating circuit 10 is comprised is not limited to nine of present embodiment, for example can be 16 or 54, this moment this LED unit (4,6 (matrixes of 9, and the quantity of the pin of driver 20 also adjusts accordingly that can be arranged in 4.

In addition, those skilled in the art also can do other variation in spirit of the present invention, certainly, the variation that these are done according to spirit of the present invention, all should be included in the present invention's scope required for protection in.

Claims

1. LED illuminator, comprise the LED illuminating circuit and link to each other with this LED illuminating circuit and in order to drive the driver of this LED illuminating circuit work, it is characterized in that: this LED illuminating circuit is made of a plurality of LED unit parallel with one another, this driver also comprises detector, this LED illuminator also comprises control circuit, this control circuit comprises the controller that links to each other with this driver, this detector detects the output state of this driver, and testing result sent to this controller, this controller compares the testing result that this detector produces to judge whether sending scan instruction to this driver with a preset value, this driver receives that each the LED unit to this LED illuminating circuit scans after this scan instruction, obtaining occurring the positional information of unusual LED unit, and this positional information is returned to this controller.

2. LED illuminator as claimed in claim 1, it is characterized in that: this driver comprises a plurality of positive level pins and a plurality of negative pole pin, this a plurality of LED unit is arranged, the positive pole of this each row's LED unit links to each other with an anodal pin, and the negative pole of the LED unit of each row links to each other with a negative pole pin.

3. LED illuminator as claimed in claim 2 is characterized in that: this driver comprises N positive level pin and N negative pole pin, and this LED illuminating circuit is made up of N2 LED unit, and this N2 LED unit cell arrangement becomes the N (matrix of N.

4. LED illuminator as claimed in claim 1 is characterized in that: this detector detects the output current or the voltage of this driver, and the analog signal that this detector will detect gained sends to this controller through after the digital-to-analogue conversion.

5. LED illumination control method, it uses LED illuminator as claimed in claim 1, comprises the steps:

Set the preset value of the output signal of this driver;

This detector sends to this controller with the real output signal of this driver;

This controller is compared this real output signal with this preset value, when this real output signal and this preset value were unequal, this detector sent one scan and instructs to this driver;

This driver receives that each the LED unit to this LED illuminating circuit scans after this scan instruction, obtaining occurring the positional information of unusual LED unit, and this positional information is returned to this controller.

6. LED illumination control method as claimed in claim 5 is characterized in that: this is set in the step of preset value of output signal of this driver, and this output signal is current value or magnitude of voltage.

7. LED illumination control method as claimed in claim 5, it is characterized in that: this driver comprises a plurality of positive level pins and a plurality of negative pole pin, this a plurality of LED unit is arranged, the positive pole of this each row's LED unit links to each other with an anodal pin, the negative pole of the LED unit of each row links to each other with a negative pole pin, this driver applies an identical voltage to the step that each LED unit of this LED illuminating circuit scans successively for this driver between each anodal pin and each negative pole pin, this detector detects the current value of each pin of flowing through respectively.