CN102842279A - Display screen and backlight drive method thereof - Google Patents
Display screen and backlight drive method thereof Download PDFInfo
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- CN102842279A CN102842279A CN2012102929032A CN201210292903A CN102842279A CN 102842279 A CN102842279 A CN 102842279A CN 2012102929032 A CN2012102929032 A CN 2012102929032A CN 201210292903 A CN201210292903 A CN 201210292903A CN 102842279 A CN102842279 A CN 102842279A
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Abstract
The embodiment of the invention discloses a display screen and a backlight drive method of the display screen, belonging to the field of drive circuit. With the arrangement of a power chip and a peripheral circuit, when input voltage of the circuit is higher than output voltage of the circuit, the circuit operates in a BUCK state; and when the input voltage of the circuit is lower than the output voltage of the circuit, the circuit operates in a BUCK-BOOST state, and enable output voltage feedback of the circuit to be in parallel connection with loads of the circuit. With the adoption of the circuit and method provided by the invention, constant voltage output of the circuit through automatically switching the circuit states is realized no matter whether the input voltage of the circuit is higher than the output voltage of the circuit, and the overall efficiency is high, and the heating phenomenon cannot be generated.
Description
Technical field
The present invention relates to the driving circuit field, relate in particular to a kind of display screen and backlight driving method thereof.
Background technology
Because LED display has the brightness height, WV is low, power consumption is little, maximization, the life-span is long, shock-resistant and steady performance, has been widely used in people's live and work.
LED display (LED display/LED Screen) is claimed electronic display again or the word screen that wafts; Form by LED dot matrix and LED PC panel; Come display text, picture, animation, video etc. through light on and off red, blue, green LED lamp; Its content can be changed at any time, and the each several part assembly all is the display device of modular construction.
Traditional LED display normally is made up of display module, control system and power-supply system.The dot matrix that display module is formed for the LED lamp constitutes, and is responsible for luminous demonstration; Control system can let contents such as screen displaying character, picture, video, monochromatic or double-colored screen mainly be used for playing literal then through the light on and off of control respective regions, and full-color screen then mainly is a playing animation; Power-supply system is responsible for transferring input voltage and input current to display screen required voltage electric current.
At present, the main employing of the backlight drive of LED display technology comprises step-down (BUCK) or (BOOST) scheme of boosting.Fig. 1 is the topological diagram of BUCK circuit in the background technology of the present invention; As shown in Figure 1, connect circuit elements devices such as inductance, resistance, electric capacity, diode and triode through chip power, to form the reduction voltage circuit of output voltage less than input voltage at DC-DC (DC-DC).Fig. 2 is the topological diagram of BOOST circuit in the background technology of the present invention; As shown in Figure 2, connect circuit elements devices such as inductance, resistance, electric capacity, diode and triode through chip power, to form the reduction voltage circuit of output voltage greater than input voltage at DC-DC (DC-DC).
Chinese patent (CN 201673655U) discloses the circuit that is used for liquid crystal display LED brightness regulation backlight, comprises a triode and LED, also comprises the control chip that can produce PWM; The collector of said triode is connected with power supply; The base stage of said triode is divided into two-way after connecting second resistance; First resistance of leading up to receives the signal of said control chip, and the second the tunnel through first capacity earth, and the emitter of said triode connects the positive pole of LED; The LED minus earth, the emitter of triode is through filtering circuit ground connection; As the LCD backlight led drive circuit, though can be through pwm pulse ripple adjustment output voltage, with the control supply current, the input voltage range of its permission is limited, does not only possess the function of carrying out buck or boost simultaneously, and its output voltage is also unstable.
Because the engineering machinery power supply is normally provided by accumulator; And the charge capacity of accumulator is not simultaneously, and the voltage of its output is also different, and the change in voltage scope of its output is from several volts even to tens volts; Exceed LED display required voltage variation range greatly; So will convert the output voltage of accumulator into satisfactory voltage through power-supply system, the voltage that promptly requires output backlight is in input voltage (Vin) scope that LED display needs, and this just needs this backlight electric power circuit to possess simultaneously to boost the function with step-down; And simple BUCK circuit or BOOST circuit can only carry out independent buck or boost function; If under some extreme conditions, the input voltage that mechanical power source provides possibly surpass the input voltage that backlight circuit allows, thereby causes the display screen can't operate as normal.
Fig. 3 for traditional first step-down in the background technology of the present invention after the topological diagram of booster circuit; As shown in Figure 3, the DC-DC circuit of employing two-stage, its prime adopts the BUCK circuit; Voltage is dropped to a lower value; Thereby the output voltage of guaranteeing the first order is lower than the possible minimum value of input voltage, and then level adopts the BOOST booster circuit, to boost.Though this scheme can realize the voltage adjustment of input voltage in relative broad range, owing to adopt two-stage DC-DC conversion, its whole efficiency is lower, and heating is big.
Summary of the invention
A kind of display screen and backlight driving method thereof are provided at present,, are greater than or less than the output voltage of circuit, utilize the automatic switch-over circuit state to realize the constant voltage output of circuit no matter realize the input voltage of circuit through power supply chip and the peripheral circuit that is provided with.
The concrete technical scheme that is adopted is:
A kind of display screen comprises that LED shows module, power supply, demonstration module group backlight drive unit, and said demonstration module group backlight drive unit comprises:
First metal-oxide-semiconductor, second metal-oxide-semiconductor, first diode, second diode, the 6th resistor, a telefault and a control module, said control module are provided with square wave output terminal and low level output terminal;
The drain electrode of said first metal-oxide-semiconductor is connected with the positive pole of said power supply; Grid is connected with said square wave output terminal; Source class is connected with the negative electrode of said second diode, and above-mentioned source class also is connected with the drain electrode of said second metal-oxide-semiconductor and the anode of said first diode respectively through said telefault;
The grid of said second metal-oxide-semiconductor is connected source class ground connection with said low level output terminal;
The negative electrode of said first diode shows that with said LED the positive pole of module is connected;
The anode of said second diode is through said the 6th resistance-grounded system;
The negative pole of said power supply, LED show the equal ground connection of negative pole of module.
Preferably, also comprise first capacitor, second capacitor, the 6th capacitor, the 7th capacitor and the 9th capacitor; Said power supply is a direct supply, and is parallel with said first capacitor and said second capacitor between the both positive and negative polarity of said direct supply; Said the 6th resistor is parallel with said the 9th capacitor; Said LED shows said six capacitor and said seven capacitor grounding of the positive pole of module through parallel connection; Wherein, said second capacitor and said the 6th capacitor are dc capacitor, and the equal ground connection of its negative pole.
Preferably; Nominal operation electric capacity/the voltage of said first capacitor, the 6th capacitor and the 7th capacitor is 22 μ F/50V; Nominal operation electric capacity/the voltage of said second capacitor is 47 μ F/50V, and the nominal operation resistance of said the 6th resistor is 100M Ω.
Preferably, the rated operational voltage of said power supply is 8-36V, and the rated operational voltage of said first metal-oxide-semiconductor, said second metal-oxide-semiconductor, first diode and second diode is 60V, and the nominal operation inductance of said telefault is 22 μ H.
Preferably, said control circuit module comprises the LM5118 chip, and said low level output terminal is the LO leads ends, and said square wave output terminal is the HO leads ends.
A kind of display backlight method of driving is applied to may further comprise the steps on the aforesaid right requirement 1 described display screen:
Step S1: under the state of input voltage, when the cathode voltage of said first diode is lower than said supply voltage, said low level output terminal constant output low level, said square wave output terminal output PWM square wave;
Step S2: said second metal-oxide-semiconductor ends, when the said first metal-oxide-semiconductor conducting, electric current from said power supply successively through first metal-oxide-semiconductor, telefault and second diode to said LED display; When said first metal-oxide-semiconductor ends, under the back-pressure effect of telefault, said first diode continuousing flow to said LED display;
Step S3: when the cathode voltage of said first diode during greater than said supply voltage, said low level output terminal and the synchronous PWM square wave of said square wave output terminal output;
Step S4: during the conducting simultaneously of said first metal-oxide-semiconductor and said second metal-oxide-semiconductor, electric current is through said first diode and the said telefault charging of said second diode pair; When said first metal-oxide-semiconductor and said second metal-oxide-semiconductor simultaneously by the time, produce high back voltage on the said telefault, said first diode continuousing flow to said LED display.
Preferably, the magnitude of voltage V of LED display described in the step S1
Out=V
InD; Wherein, V
InBe supply voltage, D is the square-wave signal dutycycle of square wave output terminal output.
Preferably, the magnitude of voltage V of LED display described in the step S2
Out=V
InD; Wherein, V
InBe supply voltage, D is the square-wave signal dutycycle of square wave output terminal output.
Preferably, among the step S1, when the cathode voltage of said first diode be lower than said supply voltage 75% the time, said low level output terminal constant output low level, said square wave output terminal output PWM square wave.
Have following advantage or beneficial effect in the technique scheme:
No matter 1, the input voltage of realization display drive circuit is greater than or less than the output voltage of circuit, all can realize the constant voltage output of circuit through the automatic switch-over circuit state;
2, the whole efficiency of display drive circuit is high;
3, display drive circuit can not produce the heating phenomenon when work.
Description of drawings
Through reading the detailed description of non-limiting example being done with reference to following accompanying drawing, it is more obvious that other features, objects and advantages of the present invention will become.
Fig. 1 is the topological diagram of BUCK circuit in the background technology of the present invention;
Fig. 2 is the topological diagram of BOOST circuit in the background technology of the present invention;
Fig. 3 for traditional first step-down in the background technology of the present invention after the topological diagram of booster circuit;
Fig. 4 is the circuit topology figure of the embodiment of display screen of the present invention and backlight driving method thereof;
Fig. 5 is the pin function structural representation of LM5118 power supply chip among the embodiment of display screen of the present invention;
Fig. 6 is the schematic circuit topological diagram during the BUCK pattern among the embodiment of display backlight driving method of the present invention;
Fig. 7 is the schematic circuit topological diagram during the BUCK-BOOST pattern among the embodiment of display backlight driving method of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further, but not as the qualification of the embodiment of the invention.
See also shown in Fig. 4-5, be display screen embodiment of the present invention.Display screen of the present invention comprises that LED shows that module, rated operational voltage are the engineering machinery direct supply (being generally accumulator) of 8-36V and show the module group backlight drive unit; Above-mentioned demonstration module group backlight drive unit comprises that rated operational voltage is the first metal-oxide-semiconductor Q1 of 60V, the second metal-oxide-semiconductor Q2, the first diode D1 and the second diode D2, and the nominal operation inductance is that telefault L1, the nominal operation resistance of 22 μ H is the 6th resistor R 6 and the control module of 100M Ω; Wherein, The drain electrode of the first metal-oxide-semiconductor Q1 is electrically connected with the anodal J1 of direct supply; The source class of the first metal-oxide-semiconductor Q1 is connected with the negative electrode of the second diode D2, and the anode of the second diode D2 is through the 6th resistance R 6 ground connection, and the source class of the above-mentioned first metal-oxide-semiconductor Q1 also is connected with the drain electrode of the second metal-oxide-semiconductor Q2 and the anode of the first diode D1 respectively through telefault L1; The first diode D1 shows that with LED the anodal J3 of module is connected, and LED shows the negative pole J4 ground connection of module; Wherein, the square wave output terminal of control module is connected with the grid of the first metal-oxide-semiconductor Q1, and to control cut-offfing of the first metal-oxide-semiconductor Q1, the low level output terminal of control module is connected with the grid of the second metal-oxide-semiconductor Q2, to control cut-offfing of the second metal-oxide-semiconductor Q2.
Preferably; The equal ground connection of negative pole J2 of the source class of the second metal-oxide-semiconductor Q2 and direct supply; And the anodal J1 of direct supply is through the first capacitor C1 and the second capacitor C2 ground connection of parallel connection; The anode of the second diode D2 is also through the nine capacitor C9 ground connection parallelly connected with the 6th resistor R 6, and LED shows the negative pole J4 of module through resistor R 8 ground connection, and LED shows six capacitor C 6 and seven capacitor C 7 ground connection of the anodal J3 of module through parallel connection; Above-mentioned second capacitor C 2 and the 6th capacitor C 6 are dc capacitor, and the equal ground connection of its negative pole; Wherein, nominal operation electric capacity/voltage of the first capacitor C1, the 6th capacitor C6 and the 7th capacitor C7 is 22 μ F/50V, and nominal operation electric capacity/voltage of the second capacitor C2 is 47 μ F/50V, and the nominal operation resistance of the 8th resistor R 8 is 27.4 Ω.
Preferably, the peripheral circuit that control module comprises the LM5118 power supply chip and is electrically connected with it, shown in each pin sequence number of LM5118 power supply chip, title and the following chart of corresponding function:
Wherein, The grid of the first metal-oxide-semiconductor Q1 is electrically connected with the HO output terminal pin 19 (each pin hereinafter is the pin of LM5118 power supply chip) of LM5118 power supply chip; The grid G end of the first metal-oxide-semiconductor Q1 is electrically connected with pin 19, and the grid of the second metal-oxide-semiconductor Q2 is electrically connected with LO output terminal pin 15; Be connected with peripheral circuit on the LM5118 power supply chip, because this peripheral circuit is a prior art, this no longer tired stating.
Referring to shown in Figure 6, the embodiment of display backlight driving method of the present invention is applied on the above-mentioned display screen, under the state of input voltage, as the voltage output end voltage V of (LED shows the anodal J3 of module)
OutVoltage V less than the input end (the anodal J1 of direct supply) of circuit
InThe time; The LO pin constant output low level of LM5118 power supply chip; Then the second metal-oxide-semiconductor Q2 is in off-state, and the HO pin is output as the PWM square wave, and then the first metal-oxide-semiconductor Q1 is along with square-wave voltage constantly repeats conducting, off-state; This moment, circuit was in the BUCK circuit state, so that the circuit input voltage is carried out step-down; When the first metal-oxide-semiconductor Q1 conducting, circuital current from the voltage output end of direct supply through the first metal-oxide-semiconductor Q1, through inductance L 1 and the first diode D1 to circuit voltage output terminal V
Out, and inductance L 1 charged; When the first metal-oxide-semiconductor Q1 broke off, inductance L 1 produced reverse voltage, and under this back-pressure effect, the first diode D1 afterflow is to circuit voltage output terminal V
OutAt this moment, the magnitude of voltage V of circuit voltage output terminal output
Out=V
InD; Wherein, V
InBe input voltage, D is the dutycycle of LM5118 power supply chip HO pin output square-wave signal.
Referring to shown in Figure 7, the embodiment of display backlight driving method of the present invention is as input end (the anodal J1 of direct supply) the voltage V of circuit
InOutput terminal (LED shows the anodal J3 of module) voltage V less than circuit
OutThe time, the LO of LM5118 power supply chip, HO pin are exported synchronous PWM square wave simultaneously, and the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 repeat synchronous conducting, cut-off state, and the circuit working in the present embodiment is at the BUCK-BOSST state at this moment; When the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 conducting, circuital current charges to inductance L 1 through the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2; When the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 by the time, on inductance L 1, produce a high back voltage, the first diode D1 afterflow is to circuit voltage output terminal V
OutAt this moment, the magnitude of voltage V of circuit voltage output terminal output
Out=V
InD/ (D-1); Wherein, V
InBe input voltage, D is the dutycycle of LM5118 power supply chip pin 19 output square-wave signals.
Wherein, the preferred voltage V that selects when voltage output end
OutInput voltage V less than circuit
InThe BUCK state of selecting start-up circuit at 75% o'clock again, to avoid the frequent commutation circuit state of circuit in the present embodiment.
In sum, a kind of display screen and the backlight driving method thereof of present embodiment reach the BUCK-BOOST that is electrically connected with it through the LM5118 power supply chip; When the input voltage of circuit is higher than output voltage; With this circuit conversion is the BUCK state, when the input voltage of circuit is lower than output voltage, is the BUCK-BOOST state with circuit conversion; And the output voltage of circuit is fed back to the LM5118 power supply chip through feedback circuit; No matter thereby the input voltage of realizing circuit is greater than or less than the output voltage of circuit, circuit of the present invention and method realize the constant voltage output of circuit through the automatic switch-over circuit state, and preferred input voltage at circuit is adjusted into the BUCK state with circuit during less than the value 75% of output voltage again; Not only realize the adjustment of the relative broad range of input voltage; And can effectively avoid the frequent switching state of circuit, and the whole efficiency of circuit is higher, also can not produce the heating phenomenon.
More than specific embodiment of the present invention is described.It will be appreciated that the present invention is not limited to above-mentioned specific implementations, equipment of wherein not describing in detail to the greatest extent and structure are construed as with the common mode in this area to be implemented; Those skilled in the art can make various distortion or modification within the scope of the claims, and this does not influence flesh and blood of the present invention.
Claims (9)
1. a display screen comprises LED demonstration module, power supply, demonstration module group backlight drive unit, it is characterized in that said demonstration module group backlight drive unit comprises:
First metal-oxide-semiconductor, second metal-oxide-semiconductor, first diode, second diode, the 6th resistor, a telefault and a control module, said control module are provided with square wave output terminal and low level output terminal;
The drain electrode of said first metal-oxide-semiconductor is connected with the positive pole of said power supply; Grid is connected with said square wave output terminal; Source class is connected with the negative electrode of said second diode, and above-mentioned source class also is connected with the drain electrode of said second metal-oxide-semiconductor and the anode of said first diode respectively through said telefault;
The grid of said second metal-oxide-semiconductor is connected source class ground connection with said low level output terminal;
The negative electrode of said first diode shows that with said LED the positive pole of module is connected;
The anode of said second diode is through said the 6th resistance-grounded system;
The negative pole of said power supply, LED show the equal ground connection of negative pole of module.
2. display screen according to claim 1 is characterized in that, also comprises first capacitor, second capacitor, the 6th capacitor, the 7th capacitor and the 9th capacitor; Said power supply is a direct supply, and is parallel with said first capacitor and said second capacitor between the both positive and negative polarity of said direct supply; Said the 6th resistor is parallel with said the 9th capacitor; Said LED shows said six capacitor and said seven capacitor grounding of the positive pole of module through parallel connection; Wherein, said second capacitor and said the 6th capacitor are dc capacitor, and the equal ground connection of its negative pole.
3. display screen according to claim 2; It is characterized in that; Nominal operation electric capacity/the voltage of said first capacitor, the 6th capacitor and the 7th capacitor is 22 μ F/50V; Nominal operation electric capacity/the voltage of said second capacitor is 47 μ F/50V, and the nominal operation resistance of said the 6th resistor is 100M Ω.
4. display screen according to claim 1; It is characterized in that; The rated operational voltage of said power supply is 8-36V, and the rated operational voltage of said first metal-oxide-semiconductor, said second metal-oxide-semiconductor, first diode and second diode is 60V, and the nominal operation inductance of said telefault is 22 μ H.
5. the circuit that display screen according to claim 1 drives is characterized in that said control circuit module comprises the LM5118 chip, and said low level output terminal is the LO leads ends, and said square wave output terminal is the HO leads ends.
6. a display backlight method of driving is characterized in that, is applied to may further comprise the steps on the aforesaid right requirement 1 described display screen:
Step S1: under the state of input voltage, when the cathode voltage of said first diode is lower than said supply voltage, said low level output terminal constant output low level, said square wave output terminal output PWM square wave;
Step S2: said second metal-oxide-semiconductor ends, when the said first metal-oxide-semiconductor conducting, electric current from said power supply successively through first metal-oxide-semiconductor, telefault and second diode to said LED display; When said first metal-oxide-semiconductor ends, under the back-pressure effect of telefault, said first diode continuousing flow to said LED display;
Step S3: when the cathode voltage of said first diode during greater than said supply voltage, said low level output terminal and the synchronous PWM square wave of said square wave output terminal output;
Step S4: during the conducting simultaneously of said first metal-oxide-semiconductor and said second metal-oxide-semiconductor, electric current is through said first diode and the said telefault charging of said second diode pair; When said first metal-oxide-semiconductor and said second metal-oxide-semiconductor simultaneously by the time, produce high back voltage on the said telefault, said first diode continuousing flow to said LED display.
7. display backlight method of driving according to claim 6 is characterized in that, the magnitude of voltage V of LED display described in the step S1
Out=V
InD; Wherein, V
InBe supply voltage, D is the square-wave signal dutycycle of square wave output terminal output.
8. display backlight method of driving according to claim 6 is characterized in that, the magnitude of voltage V of LED display described in the step S2
Out=V
InD; Wherein, V
InBe supply voltage, D is the square-wave signal dutycycle of square wave output terminal output.
9. display backlight method of driving according to claim 6; It is characterized in that, among the step S1, when the cathode voltage of said first diode be lower than said supply voltage 75% the time; Said low level output terminal constant output low level, said square wave output terminal output PWM square wave.
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| CN2012102929032A CN102842279A (en) | 2012-08-17 | 2012-08-17 | Display screen and backlight drive method thereof |
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|---|---|---|---|
| CN2012102929032A CN102842279A (en) | 2012-08-17 | 2012-08-17 | Display screen and backlight drive method thereof |
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| CN104939131A (en) * | 2015-07-02 | 2015-09-30 | 柯再立 | Minitype preserved egg coating machine |
| CN106028574A (en) * | 2016-07-27 | 2016-10-12 | 中航华东光电有限公司 | Backlight LED driving circuit |
| CN107016967A (en) * | 2017-06-09 | 2017-08-04 | 河源中光电通讯技术有限公司 | Backlight drive circuit |
| CN109686322A (en) * | 2019-02-19 | 2019-04-26 | 昆山龙腾光电有限公司 | Switching circuit and backlight drive circuit |
| CN111526641A (en) * | 2020-05-15 | 2020-08-11 | 深圳市洲明科技股份有限公司 | Back pressure self-adjusting method and device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104939131A (en) * | 2015-07-02 | 2015-09-30 | 柯再立 | Minitype preserved egg coating machine |
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| CN109686322A (en) * | 2019-02-19 | 2019-04-26 | 昆山龙腾光电有限公司 | Switching circuit and backlight drive circuit |
| CN109686322B (en) * | 2019-02-19 | 2021-11-23 | 昆山龙腾光电股份有限公司 | Switching circuit and backlight driving circuit |
| CN111526641A (en) * | 2020-05-15 | 2020-08-11 | 深圳市洲明科技股份有限公司 | Back pressure self-adjusting method and device |
| CN111526641B (en) * | 2020-05-15 | 2022-06-10 | 深圳市洲明科技股份有限公司 | Back pressure self-adjusting method and device |
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Application publication date: 20121226 |