CN202150247U - Power supply control circuit and liquid crystal display device - Google Patents
Power supply control circuit and liquid crystal display device Download PDFInfo
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- CN202150247U CN202150247U CN201120222544U CN201120222544U CN202150247U CN 202150247 U CN202150247 U CN 202150247U CN 201120222544 U CN201120222544 U CN 201120222544U CN 201120222544 U CN201120222544 U CN 201120222544U CN 202150247 U CN202150247 U CN 202150247U
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Abstract
The utility model discloses a power supply control circuit and a liquid crystal display device for meeting different voltage requirements through an input. The power supply control circuit comprises an AC-DC (alternating current to direct current) converting circuit, a voltage reduction circuit and a boosted circuit. The AC-DC converting circuit converts a first voltage value of a voltage signal provided by an external power supply end to a second voltage value which is respectively output to the boosted circuit and a signal drive circuit in the liquid crystal display device. The voltage reduction circuit converts the first voltage value of a voltage signal provided by an external power supply end to a second voltage value which is output to a panel control circuit in the liquid crystal display device. The boosted circuit is used to convert the second voltage value to a fourth voltage value which is output to the panel control circuit and the backlight source respectively. The utility model further discloses a display system.
Description
Technical field
The utility model relates to electricity and field of liquid crystal display, particularly a kind of power control circuit and liquid crystal indicator.
Background technology
At present; To display product (like LCD, OLED (Organic Light Emitting Diode) display etc.) when carrying out lighting test; Need import three road voltages such as 3.3V, 5V, 12V simultaneously, wherein, 3.3V voltage is the required WV of panel; 5V voltage is the required voltage of test circuit itself, and 12V voltage is the required WV of LED (light emitting diode).Then need external three power voltage terminals at least, use comparatively inconvenience, comparatively waste resource, because voltage need be provided respectively, consumed time is also longer simultaneously.
The utility model content
The utility model embodiment provides a kind of power control circuit, is used for satisfying the different voltages with different demand through one tunnel input, reduces the test duration, increases work efficiency.
A kind of power control circuit is applied to liquid crystal indicator, comprising: DC-to-dc change-over circuit, booster circuit and reduction voltage circuit;
The input end of said DC-to-dc change-over circuit links to each other with the external power source end, after first magnitude of voltage of the voltage signal that the external power source end is provided converts second magnitude of voltage into, exports to the signal drive circuit in said booster circuit and the liquid crystal indicator respectively;
First output terminal of said booster circuit links to each other with panel control circuit in the said liquid crystal indicator; Second output terminal links to each other with backlight, outputs to said panel control circuit and said backlight respectively after being used for converting second magnitude of voltage to the 4th magnitude of voltage;
The input end of said reduction voltage circuit links to each other with said external power source end, and first magnitude of voltage of the voltage signal that is used for said external power source end is provided converts the panel control circuit that outputs to said liquid crystal indicator behind second magnitude of voltage into.
A kind of liquid crystal indicator comprises panel, panel control circuit and backlight, also comprises described power control circuit.
Power control circuit comprises among the utility model embodiment: DC-to-dc change-over circuit, reduction voltage circuit and booster circuit; The input end of said DC-to-dc change-over circuit links to each other with the external power source end, after first magnitude of voltage of the voltage signal that the external power source end is provided converts second magnitude of voltage into, exports to signal drive circuit in said booster circuit and the liquid crystal indicator respectively; The input end of said reduction voltage circuit links to each other with said external power source end, and first magnitude of voltage of the voltage signal that is used for said external power source end is provided converts the panel control circuit that outputs to said liquid crystal indicator behind second magnitude of voltage into; First output terminal of said booster circuit links to each other with said panel control circuit, and second output terminal links to each other with backlight, outputs to said panel control circuit and said backlight respectively after being used for converting second magnitude of voltage to the 4th magnitude of voltage.The utility model embodiment converts one road input voltage into different voltages with different, thereby meets the different needs through DC-to-dc change-over circuit, reduction voltage circuit and booster circuit are set in power control circuit, economizes on resources, and increases work efficiency simultaneously.
Description of drawings
Fig. 1 is the primary structure figure of power control circuit and signal drive circuit among the utility model embodiment;
Fig. 2 is the physical circuit figure of DC-to-dc change-over circuit among the utility model embodiment;
Fig. 3 is the physical circuit figure of reduction voltage circuit among the utility model embodiment;
Fig. 4 is the physical circuit figure of booster circuit among the utility model embodiment.
Embodiment
Power control circuit comprises among the utility model embodiment: DC-to-dc change-over circuit, reduction voltage circuit and booster circuit; The input end of said DC-to-dc change-over circuit links to each other with the external power source end, after first magnitude of voltage of the voltage signal that the external power source end is provided converts second magnitude of voltage into, exports to signal drive circuit in said booster circuit and the liquid crystal indicator respectively; The input end of said reduction voltage circuit links to each other with said external power source end, and first magnitude of voltage of the voltage signal that is used for said external power source end is provided converts the panel control circuit that outputs to said liquid crystal indicator behind second magnitude of voltage into; First output terminal of said booster circuit links to each other with said panel control circuit, and second output terminal links to each other with backlight, is used for outputing to said panel control circuit and said backlight respectively after second magnitude of voltage with voltage signal converts the 4th magnitude of voltage to.The utility model embodiment converts one road input voltage into different voltages with different, thereby meets the different needs through DC-to-dc change-over circuit, reduction voltage circuit and booster circuit are set in power control circuit, economizes on resources, and increases work efficiency simultaneously.
Referring to Fig. 1, power control circuit comprises DC-to-dc change-over circuit 101 among the utility model embodiment, reduction voltage circuit 102, booster circuit 103.Said device also comprises first interface unit 105, second interface unit 106.Said device can also comprise the 3rd interface unit 107.Said power control circuit among the utility model embodiment is applied to liquid crystal indicator, also comprises signal drive circuit 104 and panel control circuit 108 in the liquid crystal indicator.
The input end of DC-to-dc change-over circuit 101 links to each other with external power source end 109, and output terminal links to each other with the first input end of signal drive circuit 104 and the input end of booster circuit 103 respectively; The input end of reduction voltage circuit 102 links to each other with external power source end 109, and output terminal links to each other with panel control circuit 108; First output terminal of booster circuit 103 links to each other with panel control circuit 108, and second output terminal links to each other with backlight; Second input end of signal drive circuit 104 links to each other with external data signal, and output terminal links to each other with panel control circuit 108.
Wherein, The output terminal of reduction voltage circuit 102 can link to each other with panel control circuit 108 through first interface unit 105; That is, the output terminal of reduction voltage circuit 102 connects the first input end of first interface unit 105, and the output terminal of first interface unit 105 connects the input end of panel control circuit 108.First output terminal of booster circuit 103 can link to each other with panel control circuit 108 through first interface unit 105, that is, first output terminal of booster circuit 103 connects second input end of first interface unit 105.Second output terminal of booster circuit 103 can link to each other with backlight through second interface unit 106, that is, second output terminal of booster circuit 103 connects the input end of second interface unit 106, and the output terminal of second interface unit 106 connects the input end of backlight.The output terminal of signal drive circuit 104 can link to each other with panel control circuit 108 through first interface unit 105, that is, the output terminal of signal drive circuit 104 connects the 3rd input end of first interface unit 105.The external data signal end can link to each other with second input end of signal drive circuit 104 through the 3rd interface unit 107; Wherein, external data signal among the utility model embodiment (can abbreviate signal as) can be TMDS (Transition Minimized Differential Signaling, a transition minimized differential signaling); Can transmit through DVI (digital visual interface); That is, for example, the 3rd interface unit 107 can be DVI among the utility model embodiment.
After first magnitude of voltage of the voltage signal that DC-to-dc change-over circuit 101 is used for external power source end 109 is provided converts second magnitude of voltage into, export to the signal drive circuit 104 in booster circuit 103 and the liquid crystal indicator respectively.Wherein, among the utility model embodiment, first magnitude of voltage of voltage signal can be 5V, and second magnitude of voltage can be 3.3V.If need change to some extent according to different needs magnitudes of voltage, then those skilled in the art know how to make corresponding deformation according to the thought of the utility model naturally.Concrete, DC-to-dc change-over circuit 101 can be the DC-DC circuit.External power source end 109 can provide first magnitude of voltage of voltage signal for DC-to-dc change-over circuit 101; It is the 5V voltage signal; DC-to-dc change-over circuit 101 passes through internal conversion; Be converted into second magnitude of voltage, second magnitude of voltage with voltage signal outputs to signal drive circuit 104 and booster circuit 103 respectively afterwards.
DC-to-dc change-over circuit 101 can also comprise filtering circuit, conversion electronic circuit and first negative-feedback circuit.Said filtering circuit is used for the clutter of the voltage signal of voltage signal that the said DC-to-dc change-over circuit of filtering 101 receives and output; That said conversion electronic circuit is used for is 109 that provide with the external power source end, after first magnitude of voltage of the filtered voltage signal of filtering circuit converts second magnitude of voltage into, export; Said first negative-feedback circuit is used for the voltage signal of said conversion electronic circuit output is carried out negative feedback.
Preferable, a kind of concrete realization circuit diagram of DC-to-dc change-over circuit 101 is as shown in Figure 2.Filtering circuit comprises first electric capacity (hereinafter to be referred as C1), second electric capacity (hereinafter to be referred as C2), the 3rd electric capacity (hereinafter to be referred as C3), the 4th electric capacity (hereinafter to be referred as C4), the 4th resistance (hereinafter to be referred as R4) and inductance (hereinafter to be referred as L); The conversion electronic circuit comprises DC-DC chip, the first transistor (hereinafter to be referred as T1); First negative-feedback circuit comprises first resistance (hereinafter to be referred as R1), second resistance (hereinafter to be referred as R2), the 3rd resistance (hereinafter to be referred as R3) and transistor seconds (hereinafter to be referred as T2).Among the utility model embodiment, T1 can be a voltage stabilizing diode, and T2 can be a triode.
Wherein, External power source end 109 (being vdd terminal) links to each other with the end of L, the input end of DC-DC chip (being the Vin end) and the end of C2; The other end of L connects switch selecting side (the being SW) end of DC-DC chip and the positive pole of T1; The negative pole of T1 connects the end of R1 and the end of C1, is the AVDD1 end, should end also be the output terminal of said DC-to-dc change-over circuit 101 simultaneously; The other end ground connection of C1; The other end of R1 connects the collector of the end of R2, the feedback end of DC-DC chip (being the FB end) and T2, and promptly said R1 and R2 are connected on the AVDD1 end as divider resistance, and wherein dividing point links to each other with the feedback end of DC-DC chip and the collector of T3; The other end of R2 connects the earth terminal (being the GND end) of DC-DC chip and the end of R3; The other end of R3 connects the emitter of T2, and promptly R3 is connected between the emitter and ground of T3, and the base stage of T2 links to each other with the AVDD1 end; The other end of C2 links to each other and ground connection with the end of C3, the end of C4, the compensation end (being the COMP end) of DC-DC chip, the earth terminal of DC-DC chip, the end of R2, the end of R3; The other end of C3 links to each other with the end of R4, and the other end of R4 links to each other with the power input (being the Vc end) of DC-DC chip, and promptly R4 and C3 are connected on the power input of DC-DC chip; Be used to the DC-DC chip power supply signal is provided; The other end of C4 links to each other with the soft protection end (being the SS end) of DC-DC chip, and the sheet choosing end of DC-DC chip (i.e.
end) connects the external control signal end, and the DC-DC chip is started working when the external control signal end is the significant level signal; Otherwise hang up, wherein the significant level signal can be a high level signal among the utility model embodiment.Can have multiple DC-DC chip all can accomplish the task of the utility model, for example a kind of model of DC-DC chip can be RT9277.
Wherein, C1, C2 mainly play pressure stabilization function, and C3, C4 mainly are filter actions.The effect of L is that perfectly straight flow resistance exchanges, and T1 is used for burning voltage, and R1 and R2 are the divider resistance of T2, and T2 mainly plays degenerative effect.When first magnitude of voltage of external power source through the vdd terminal input voltage signal; Import the significant level signal through the sheet choosing end of DC-DC chip simultaneously; The DC-DC chip is started working; Convert first magnitude of voltage of voltage signal of input second magnitude of voltage of voltage signal into, export through the negative pole of T1.The FB end of T2 and DC-DC chip links to each other, and the negative feedback through T2 can make second magnitude of voltage of voltage signal of the output of DC-DC chip be maintained within a certain range.
Be signal drive circuit 104 and booster circuit 103 input different voltages with different values if desired; Then can also between DC-to-dc change-over circuit 101 and booster circuit 103, add a voltage conversion circuit, export to booster circuit 103 again after converting second magnitude of voltage of the voltage signal of DC-to-dc change-over circuit 101 output into booster circuit 103 required magnitude of voltage with this voltage conversion circuit.Be signal drive circuit 104 and booster circuit 103 input different voltages with different values if desired, what then input to signal drive circuit 104 can be second magnitude of voltage of voltage signal, and what input to booster circuit 103 can be the tertiary voltage value of voltage signal.For example, second magnitude of voltage can be 3.3V, and the tertiary voltage value can be 4.2V.
First magnitude of voltage of the voltage signal that reduction voltage circuit 102 is used for said external power source end 109 is provided converts the panel control circuit 108 that outputs to said liquid crystal indicator behind second magnitude of voltage into.As shown in Figure 3, be a kind of realization circuit diagram of reduction voltage circuit 102 among the utility model embodiment.
First condenser network comprises the 5th electric capacity (hereinafter to be referred as C5), the 6th electric capacity (hereinafter to be referred as C6) and the 7th electric capacity (hereinafter to be referred as C7); First change-over circuit comprises the 3rd transistor (hereinafter to be referred as T3) and first conversion chip, and second negative-feedback circuit comprises the 5th resistance (hereinafter to be referred as R5), the 6th resistance (hereinafter to be referred as R6) and the 8th electric capacity (hereinafter to be referred as C8).Among the utility model embodiment, T3 can be a voltage stabilizing diode.
Wherein, External power source end 109 (being vdd terminal) links to each other with the negative pole of T3 with the end of C5, the end of C6, the input end (being the IN end) of first conversion chip, the other end of C5 and the equal ground connection of the other end of C6, and the positive pole of T3 links to each other with first output terminal, second output terminal, the end of R5 and the end of C7 of first conversion chip; Be the AVDD2 end; This AVDD2 end also is the output terminal of reduction voltage circuit 102 simultaneously, and the other end of R5 links to each other the other end ground connection of C7 with the output voltage fine setting end (being the ADJ end) of first conversion chip, the end of R6 and the end of C8; The other end of R6 links to each other with the other end of C8 and ground connection; Be that R5 and R6 are connected between AVDD2 end and the ground as divider resistance, its dividing point links to each other with the output voltage fine setting end of said first conversion chip, and C8 is connected in parallel on the R6 two ends.Can have multiple first conversion chip all can accomplish the task of the utility model, for example a kind of model of first conversion chip can be AS1117M.
Wherein, C5, C6, C7 are filter capacitor, and the output voltage stabilization that the effect through second negative-feedback circuit can make first conversion chip is about 3.3V.T3 is used for voltage stabilizing, and anti-simultaneously stop signal refluxes.When external power source is first magnitude of voltage of reduction voltage circuit 102 input voltage signals through external power source end 109; C5 and the C6 clutter in can the filtering voltage signal; First magnitude of voltage of voltage signal directly gets into first conversion chip through the input end of first conversion chip, through the conversion of first conversion chip, first magnitude of voltage of voltage signal is converted into second magnitude of voltage of voltage signal; Export through the output terminal of first conversion chip again; Simultaneously, be connected with C7, once more the clutter in the voltage signal of filtering output at the output terminal of reduction voltage circuit 102.Second negative-feedback circuit of being made up of R5, R6 and C8 can effectively improve the constancy of gain, reduces nonlinear distortion, suppresses noise in the feedback loop, extending bandwidth.
Referring to Fig. 4, be a kind of way of realization of booster circuit 103 among the utility model embodiment.Wherein, booster circuit 103 comprises second condenser network, second change-over circuit and transistor circuit.Said second condenser network is used for the clutter of the voltage signal of the said booster circuit reception of filtering; Said second change-over circuit is used for exporting after second magnitude of voltage with the voltage signal that receives converts the 4th magnitude of voltage into, and said transistor circuit is used for the voltage signal of said second change-over circuit output is carried out negative feedback.
Second condenser network comprises the 9th electric capacity (hereinafter to be referred as C9) and the tenth electric capacity (hereinafter to be referred as C10), and second change-over circuit comprises second conversion chip and the 7th resistance (hereinafter to be referred as R7), and transistor circuit comprises at least two transistors of a plurality of serial connections.Among the utility model embodiment, a plurality of transistors that said transistor circuit comprises can be LED.
Wherein, The input end of booster circuit 103 links to each other with second output terminal of DC-to-dc change-over circuit 101; This end links to each other with the end of C9, the end of R7 and the input end (being the VIN end) of second conversion chip simultaneously; The other end ground connection of C9; The other end of R7 links to each other with the switch terminals (being the SW end) of second conversion chip, the overvoltage protection end (being the OVP end) of second conversion chip, the end of C10 and the positive pole of the anodal LED that does not link to each other with the negative pole of another LED, and this end also is the output terminal of booster circuit 103, the other end ground connection of C10; A plurality of LED join end to end and are connected on the output terminal of booster circuit 103; The negative feedback end of second conversion chip (being the FB end) links to each other with the negative pole of the LED that negative pole does not link to each other with the positive pole of another LED, and the Enable Pin of second conversion chip (being the EN end) links to each other with the external control signal end, the earth terminal of second conversion chip (being the GND end) ground connection.Wherein, C9, C10 are filter capacitor.Can have multiple second conversion chip all can accomplish the task of the utility model, for example a kind of model of second conversion chip can be RT8561.
When DC-to-dc change-over circuit 101 passes through second magnitude of voltage of the second output terminal output voltage signal; The clutter of C9 in can the filtering voltage signal; Second magnitude of voltage of voltage signal gets into second conversion chip through the input end of second conversion chip; The external control signal end is to the Enable Pin input significant level signal of second conversion chip simultaneously; Make the second conversion chip work,, second magnitude of voltage of the voltage signal that receives is converted into the 4th magnitude of voltage and the output of voltage signal through the conversion of second conversion chip.
The 3rd interface unit 107 is used for the external data signal of receiving from the external data signal termination is transferred to signal drive circuit 104.
The utility model embodiment also provides a kind of liquid crystal indicator, comprises said power control circuit, panel control circuit 108, panel and backlight.
Power control circuit comprises among the utility model embodiment: DC-to-dc change-over circuit 101, reduction voltage circuit 102 and booster circuit 103; The input end of said DC-to-dc change-over circuit 101 links to each other with external power source end 109; After first magnitude of voltage of the voltage signal that external power source end 109 is provided converts second magnitude of voltage into, export to signal drive circuit 104 in said booster circuit 103 and the liquid crystal indicator; The input end of said reduction voltage circuit 102 links to each other with said external power source end 109, and first magnitude of voltage of the voltage signal that is used for said external power source end 109 is provided converts the panel control circuit 108 that outputs to said liquid crystal indicator behind second magnitude of voltage into; First output terminal of said booster circuit 103 links to each other with said panel control circuit 108, and second output terminal links to each other with backlight, outputs to said panel control circuit 108 and said backlight respectively after being used for converting second magnitude of voltage to the 4th magnitude of voltage.The utility model embodiment is through being provided with DC-to-dc change-over circuit 101, reduction voltage circuit 102 and booster circuit 103 in power control circuit; Convert one road input voltage into different voltages with different; Thereby meet the different needs, economize on resources, increase work efficiency simultaneously.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from the spirit and the scope of the utility model.Like this, belong within the scope of the utility model claim and equivalent technologies thereof if these of the utility model are revised with modification, then the utility model also is intended to comprise these changes and modification interior.
Claims (10)
1. a power control circuit is applied to liquid crystal indicator, it is characterized in that, comprising: DC-to-dc change-over circuit, booster circuit and reduction voltage circuit;
The input end of said DC-to-dc change-over circuit links to each other with the external power source end, after first magnitude of voltage of the voltage signal that the external power source end is provided converts second magnitude of voltage into, exports to the signal drive circuit in said booster circuit and the liquid crystal indicator respectively;
First output terminal of said booster circuit links to each other with panel control circuit in the said liquid crystal indicator; Second output terminal links to each other with backlight, is used for outputing to said panel control circuit and said backlight respectively after second magnitude of voltage with voltage signal converts the 4th magnitude of voltage to;
The input end of said reduction voltage circuit links to each other with said external power source end, and first magnitude of voltage of the voltage signal that is used for said external power source end is provided converts the panel control circuit that outputs to said liquid crystal indicator behind second magnitude of voltage into.
2. circuit as claimed in claim 1 is characterized in that, said DC-to-dc change-over circuit comprises filtering circuit, conversion electronic circuit and first negative-feedback circuit;
Said filtering circuit is used for the clutter of the voltage signal of voltage signal that filtering receives and output;
That said conversion electronic circuit is used for external power source is provided, after first magnitude of voltage of the filtered voltage signal of said filtering circuit converts second magnitude of voltage into, export;
Said first negative-feedback circuit is used for the voltage signal of said conversion electronic circuit output is carried out negative feedback.
3. circuit as claimed in claim 2 is characterized in that, said filtering circuit comprises first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 4th resistance and inductance; Said conversion electronic circuit comprises DC-DC chip and the first transistor; Said first negative-feedback circuit comprises first resistance, second resistance, the 3rd resistance and transistor seconds; Said the first transistor is a voltage stabilizing diode, and said transistor seconds is a triode; Wherein:
The external power source end links to each other with the input end of an end of said inductance, said DC-DC chip and an end of said second electric capacity; The other end of said inductance connects the switch selecting side of said DC-DC chip and the positive pole of said the first transistor; The negative pole of said the first transistor connects an end of said first resistance and an end of said first electric capacity; This end is the output terminal of said first change-over circuit; The other end ground connection of said first electric capacity; Said first resistance and said second resistance are connected between the output terminal and ground of said first change-over circuit as divider resistance; Wherein dividing point links to each other with the said the 3rd transistorized collector with the feedback end of said DC-DC chip, and the said the 3rd transistorized base stage links to each other with said AVDD1 end, and said the 3rd resistance is connected between the said the 3rd transistorized emitter and the ground; The other end of said second electric capacity links to each other with an end of the earth terminal of the compensation end of an end of an end of said the 3rd electric capacity, said the 4th electric capacity, said DC-DC chip, said DC-DC chip, said second resistance and ground connection; Said the 4th resistance and said the 3rd capacitances in series are at the power input of said DC-DC chip, and the other end of said the 4th electric capacity links to each other with the soft protection end of said DC-DC chip, and the sheet choosing end of said DC-DC chip links to each other with the external control signal end.
4. circuit as claimed in claim 1 is characterized in that, said reduction voltage circuit comprises: first condenser network, first change-over circuit and second negative-feedback circuit;
Said first condenser network is used for the clutter of the voltage signal of voltage signal that filtering receives and output;
After converting second magnitude of voltage into, exports first magnitude of voltage of the voltage signal that said first change-over circuit is used for the external power source end is provided;
Said second negative-feedback circuit is used for the voltage signal of said first change-over circuit output is carried out negative feedback.
5. circuit as claimed in claim 4; It is characterized in that; Said first condenser network comprises the 5th electric capacity, the 6th electric capacity and the 7th electric capacity; Said first change-over circuit comprises the 3rd transistor and first conversion chip, and said second negative-feedback circuit comprises the 5th resistance, the 6th resistance and the 8th electric capacity; Said the 3rd transistor is a voltage stabilizing diode;
The external power source input end links to each other with the said the 3rd transistorized negative pole with the input end of an end of an end of said the 5th electric capacity, said the 6th electric capacity, said first conversion chip; The equal ground connection of the other end of the other end of said the 5th electric capacity and said the 6th electric capacity; The said the 3rd transistorized positive pole links to each other with first output terminal, second output terminal, an end of said the 5th resistance and an end of said the 7th electric capacity of said first conversion chip; This end is the output terminal of said reduction voltage circuit; Said the 5th resistance and said the 6th resistance are connected between the output terminal and ground of institute's reduction voltage circuit as divider resistance; Its dividing point links to each other with the output voltage fine setting end of said first conversion chip, and said the 8th electric capacity is connected in parallel on said the 6th resistance two ends, the other end ground connection of said the 7th electric capacity.
6. circuit as claimed in claim 1 is characterized in that, said booster circuit comprises: second condenser network, second change-over circuit and transistor circuit;
Said second condenser network is used for the clutter of the voltage signal of filtering reception;
Said second change-over circuit is used for exporting after second magnitude of voltage with the voltage signal that receives converts the 4th magnitude of voltage into;
Said transistor circuit is used for the voltage signal of said second change-over circuit output is carried out negative feedback.
7. circuit as claimed in claim 6 is characterized in that, said second condenser network comprises the 9th electric capacity and the tenth electric capacity, and said second change-over circuit comprises second conversion chip and the 7th resistance, and said transistor circuit comprises at least two transistors of serial connection; Said transistor is a light emitting diode;
Wherein, Second output terminal of said DC-to-dc change-over circuit links to each other with an end of an end of said the 9th electric capacity, said the 7th resistance and the input end of said second conversion chip; The other end ground connection of said the 9th electric capacity; The positive pole of one end of the switch terminals of the other end of said the 7th resistance and said second conversion chip, overvoltage protection end, said the tenth electric capacity and first light emitting diode of serial connection links to each other, the other end ground connection of said the tenth electric capacity, and the negative feedback end of said second conversion chip links to each other with the negative pole of last light emitting diode of serial connection; The Enable Pin of said second conversion chip links to each other with the external control signal end, earth terminal ground connection.
8. circuit as claimed in claim 1 is characterized in that, also comprises: first interface unit and second interface unit;
The first input end of said first interface unit links to each other with the output terminal of said reduction voltage circuit; Second input end links to each other with the output terminal of said signal drive circuit; Said the 3rd input end links to each other with first output terminal of said booster circuit; Output terminal links to each other with panel control circuit, is used for the signal that receives is transferred to panel control circuit;
The input end of said second interface unit links to each other with second input end of said booster circuit, and output terminal links to each other with backlight, is used for the signal that receives is transferred to backlight.
9. circuit as claimed in claim 1 is characterized in that, also comprises: the 3rd interface unit, and its input end links to each other with the external data signal end, and output terminal links to each other with second input end of said signal drive circuit, is used to receive external data signal and transmission.
10. a liquid crystal indicator comprises panel, panel control circuit and backlight, it is characterized in that, also comprises each described power control circuit like claim 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120222544U CN202150247U (en) | 2011-06-28 | 2011-06-28 | Power supply control circuit and liquid crystal display device |
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| CN201120222544U CN202150247U (en) | 2011-06-28 | 2011-06-28 | Power supply control circuit and liquid crystal display device |
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| CN202150247U true CN202150247U (en) | 2012-02-22 |
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| CN103560575A (en) * | 2013-11-12 | 2014-02-05 | 京东方科技集团股份有限公司 | Power supply device and electronic equipment |
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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 |
| CN113920936A (en) * | 2021-10-18 | 2022-01-11 | 京东方科技集团股份有限公司 | Signal monitoring circuit, display control circuit and display device |
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2011
- 2011-06-28 CN CN201120222544U patent/CN202150247U/en not_active Expired - Lifetime
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| US9345102B2 (en) | 2013-11-12 | 2016-05-17 | Boe Technology Group Co., Ltd. | Power supply device and electronic device |
| CN103560575A (en) * | 2013-11-12 | 2014-02-05 | 京东方科技集团股份有限公司 | Power supply device and electronic equipment |
| CN105304018A (en) * | 2015-11-13 | 2016-02-03 | 苏州扬佛自动化设备有限公司 | Interaction display screen control circuit |
| CN105609044A (en) * | 2015-12-24 | 2016-05-25 | 大连集思特科技有限公司 | Video control system and method of LED color difference compensation |
| CN105788556B (en) * | 2016-05-20 | 2018-12-11 | 深圳市华星光电技术有限公司 | A kind of overvoltage crowbar and method, liquid crystal display drive circuit |
| CN105788556A (en) * | 2016-05-20 | 2016-07-20 | 深圳市华星光电技术有限公司 | Overvoltage protection circuit and method and liquid crystal drive circuit |
| WO2019029490A1 (en) * | 2017-08-07 | 2019-02-14 | 京东方科技集团股份有限公司 | Light up control system board, detection method, and light up detection device |
| CN107402460A (en) * | 2017-08-07 | 2017-11-28 | 京东方科技集团股份有限公司 | A kind of lighting control system plate, detection method and lighting detection means |
| CN107402460B (en) * | 2017-08-07 | 2020-03-24 | 京东方科技集团股份有限公司 | Lighting control system board, detection method and lighting detection device |
| US10991282B2 (en) | 2017-08-07 | 2021-04-27 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Light up control system board, detection method, and light up detection device |
| CN109064957A (en) * | 2018-08-15 | 2018-12-21 | 京东方科技集团股份有限公司 | Lighting test mould group |
| CN109064957B (en) * | 2018-08-15 | 2021-11-30 | 京东方科技集团股份有限公司 | Lighting test module |
| 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 |
| CN113920936A (en) * | 2021-10-18 | 2022-01-11 | 京东方科技集团股份有限公司 | Signal monitoring circuit, display control circuit and display device |
| CN113920936B (en) * | 2021-10-18 | 2024-03-12 | 京东方科技集团股份有限公司 | Signal monitoring circuit, display control circuit and display device |
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Owner name: JINGDONGFANG SCIENCE AND TECHNOLOGY GROUP CO., LTD Free format text: FORMER OWNER: BEIJING BOE PHOTOELECTRICITY SCIENCE + TECHNOLOGY CO., LTD. Effective date: 20150706 Owner name: BEIJING BOE PHOTOELECTRICITY SCIENCE + TECHNOLOGY Effective date: 20150706 |
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Effective date of registration: 20150706 Address after: 100015 Jiuxianqiao Road, Beijing, No. 10, No. Patentee after: BOE Technology Group Co., Ltd. Patentee after: Beijing BOE Photoelectricity Science & Technology Co., Ltd. Address before: 100176 Beijing city in Western Daxing District economic and Technological Development Zone, Road No. 8 Patentee before: Beijing BOE Photoelectricity Science & Technology Co., Ltd. |
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