CN102118904B

CN102118904B - LED illuminating system and control method thereof

Info

Publication number: CN102118904B
Application number: CN200910312911.7A
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: 2014-01-22
Anticipated expiration: 2029-12-31
Also published as: CN102118904A

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 (Light Emitting Diode, LED) has been widely used in liquid crystal display, as the backlight as liquid crystal display.Because LED has little power consumption, luminous efficiency is high, and the advantage such as pollution-free after discarded, is the backlight source material of at present comparatively desirable liquid crystal display.

LED-backlit source is generally the light source group that a plurality of LED light sources consist of series connection or parallel way.For in-line LED-backlit source, because each LED light source is gone here and there on same circuit, if the class that wherein has a LED light source that for example short circuit occurs or open circuit is abnormal, the LED on whole piece circuit will occur extremely so, thereby affect the normal operation of liquid crystal display.In addition, abnormal owing to cannot learning that concrete which LED light source occurs, 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 automatically investigate LED illuminator and the LED illumination control method of fault.

An illuminator, comprises that LED illuminating circuit is connected with LED illuminating circuit and in order to the driver of driving LED illuminating circuit work.LED illuminating circuit is by a plurality of LED cell formations parallel with one another.Driver also comprises detector.LED illuminator also comprises control circuit.Control circuit comprises the controller being connected with driver.Detector detects the output state of driver, and testing result is sent to controller.The testing result that controller produces detector compares to judge whether to send scan instruction to driver with a preset value.Driver scans each LED unit of LED illuminating circuit after receiving scan instruction, to obtain occurring the positional information of abnormal LED unit, and positional information is returned to controller.

An illumination control method, it applies 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 by 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 are when unequal, this detector sends one scan instruction to this driver; This driver scans each LED unit of this LED illuminating circuit after receiving this scan instruction, to obtain occurring the positional information of abnormal LED unit, and this positional information is returned to this controller.

Parallel with one another between the LED unit of above-mentioned LED illuminator, thus one of them LED unit extremely can't affect the normal operation of other LED unit, improved job stability.In addition, above-mentioned LED illuminator can detect the position of the LED unit that unusual condition occurs automatically.

Accompanying drawing explanation

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

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

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

Main element symbol description

LED illuminator 100

LED illuminating circuit 10

LED unit 11

Driver 20

Anodal pin two 1a, 21b, 21c

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 to concrete introduction.

Refer to Fig. 1, the LED illuminator 100 of the embodiment of the present invention comprises LED illuminating circuit 10, the driver 20 being connected with LED illuminating circuit 10 and the control circuit 30 being connected with driver 20.

Refer to Fig. 2, driver 20 can driving LED illuminating circuit 10 work, 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.The control signal that input pin 22 sends for reception control circuit 30.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 the matrix of 3*3, and on Fig. 2, use respectively L ₁₁, L ₁₂and L ₃₃carry out mark.The positive pole of three LED unit 11 of each horizontally-arranged is connected by wire, and is connected with one of them anodal pin of driver 20.The negative pole of three LED unit 11 of each file is connected by wire, and is connected with one of them negative pole pin of driver 20.Thus, these nine LED unit 11 are state in parallel between any two.During normal operation, driver 20 is exported a normal voltage between all anodal pins and negative pole pin, to drive these nine LED unit 11 to work simultaneously.

Driver 20 also comprises detector 25.Detector 25 is for detection of 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, detector 25 is converted into digital signal by sending to controller 31 by output pin 24 by the analog signal that detects gained by an analog-to-digital conversion module (not shown).

Please again consult Fig. 1, control circuit 30 comprises the controller 31 being connected with driver 20.Controller 31 is compared the testing result of detector 25 generations with a default value, to judge whether sending one scan instruction to driver 20.Driver 20 receives after this scan instruction, starts each LED unit of LED illuminating circuit 10 to scan, and to obtain occurring the positional information of abnormal LED unit, and positional information is returned to controller 31.

Refer to Fig. 3, the control method of the LED illuminator 100 of the embodiment of the present 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 Time Controller 31 sends control signal, controls driver 20, so that LED illuminating circuit 10 is started working.Now, detector 25 sends to controller 31 in real time by 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 to step S102.One or more LED unit in LED illuminating circuit 10 opens circuit or during short circuit, voltage or current value that driver 20 is exported to this abnormal LED unit will there will be extremely.When this real output signal and this preset value is unequal or while not falling in this preset value, enter step S104.

S104, controller 31 sends one scan instruction to driver 20.

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

Please again consult Fig. 2.In the present embodiment, driver 20 applies after a normal voltage successively between each anodal pin two 1a, 21b and 21c and each

negative pole pin

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

When using the LED illuminator 100 of the embodiment of the present invention, due to parallel with one another between LED unit 11, therefore one of them LED unit 11 extremely can't affect the normal operation of other LED unit 11, and can fast detecting go out the position of abnormal LED unit, improved job stability.

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

In addition, those skilled in the art also can do other and change 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. a LED illuminator, comprise that LED illuminating circuit is connected 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 by a plurality of LED cell formations parallel with one another, this driver also comprises detector, this LED illuminator also comprises control circuit, this control circuit comprises the controller being connected with this driver, this detector detects the output state of this driver, and testing result is sent to this controller, the testing result that this controller produces this detector compares to judge whether to send scan instruction to this driver with a preset value, this driver scans each LED unit of this LED illuminating circuit after receiving this scan instruction, to obtain occurring the positional information of abnormal 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, the plurality of LED unit is matrix and arranges, the positive pole of this each row's LED unit is connected with an anodal pin, and the negative pole of the LED unit of each row is connected 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 by N ²individual LED unit forms, this N ²individual LED unit is arranged in the matrix of N*N.

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

5. a LED illumination control method, it applies 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 by 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 are when unequal, this detector sends one scan instruction to this driver;

This driver scans each LED unit of this LED illuminating circuit after receiving this scan instruction, to obtain occurring the positional information of abnormal 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, the plurality of LED unit is matrix and arranges, the positive pole of this each row's LED unit is connected with an anodal pin, the negative pole of the LED unit of each row is connected with a negative pole pin, the step that this driver scans each LED unit of this LED illuminating circuit applies an identical voltage successively for this driver between each anodal pin and each negative pole pin, and this detector detects respectively the current value of each pin of flowing through.