CN105405425A - Driving circuit switching control circuit and display device - Google Patents
Driving circuit switching control circuit and display device Download PDFInfo
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- CN105405425A CN105405425A CN201510982111.1A CN201510982111A CN105405425A CN 105405425 A CN105405425 A CN 105405425A CN 201510982111 A CN201510982111 A CN 201510982111A CN 105405425 A CN105405425 A CN 105405425A
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- 239000003990 capacitor Substances 0.000 claims description 6
- 230000000052 comparative effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 6
- 239000010409 thin film Substances 0.000 description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 101100112673 Rattus norvegicus Ccnd2 gene Proteins 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a driving circuit switching control circuit. A driving circuit outputs driving current to drive a display panel according to direct-current input voltage. The switching control circuit is used for controlling size of the driving current output by the driving circuit, and comprises a current detecting unit and a comparing unit. The current detecting unit is used for detecting current size of a driving current switching control circuit body and converting the detected current into detection voltage. The comparing unit is used for comparing size of the detection voltage and that of the reference voltage and outputting control signals of high level or low level so as to control the size of the driving current output by the driving circuit according to comparison results. The invention also provides a display device using the above driving circuit switching control circuit. According to the invention, the driving circuit switching control circuit and the display device can automatically control the driving current to be switched according to the display panel, i.e., the size of load, and are highly flexible.
Description
Technical field
The present invention relates to a kind of liquid panel technique field, particularly a kind of drive current control switching circuit and display device.
Background technology
Liquid crystal indicator (LiquidCrystalDisplay, LCD) possesses the plurality of advantages such as frivolous, energy-conservation, radiationless, has therefore replaced traditional cathode-ray tube (CRT) (CRT) display gradually.Current liquid crystal display is widely used in the electronic equipments such as HD digital TV, desk-top computer, personal digital assistant (PDA), notebook computer, mobile phone, digital camera.
With thin film transistor (TFT) (ThinFilmTransistor, TFT) liquid crystal indicator is example, it comprises: display panels and driving circuit, wherein, display panels comprises many gate lines and a plurality of data lines, and adjacent two gate lines and adjacent two data lines intersect to form a pixel cell, each pixel cell at least comprises a thin film transistor (TFT).And driving circuit comprises: gate driver circuit (gatedrivecircuit) and source electrode drive circuit (sourcedrivecircuit).
The basic functional principle of display panels and driving circuit is: gate driver circuit is by sending gate drive signal with pulling up transistor to gate line of being electrically connected of gate line, sequentially the TFT of every a line is opened, then the pixel cell of a full line is charged to voltage required separately, to show different GTGs by source electrode drive circuit simultaneously.Namely first by its pull up transistor (output stage thin film transistor (TFT)), the thin film transistor (TFT) of the first row is opened by the gate driver circuit of the first row, then charged by the pixel cell of source electrode drive circuit to the first row.When the pixel cell of the first row is charged, this row thin film transistor (TFT) just cuts out by gate driver circuit, then the gate driver circuit of the second row is pulled up transistor by it and to be opened by thin film transistor (TFT) of the second row, then carries out discharge and recharge by source electrode drive circuit to the pixel cell of the second row.So sequentially go down, when the pixel cell of substituting the bad for the good last column, just charge from the first row again.
Fig. 1 is the module diagram of the source electrode drive circuit of prior art.As shown in Figure 1, source electrode drive circuit comprises power input, the DC voltage AVDD that power input exports for receiving direct voltage source.In addition, make the electric current difference consumed because display panel is varying in size of load under different pictures, in order to increase the dirigibility of source electrode drive circuit, source electrode drive circuit has driving force and selects input end.When driving force selects input end to receive the voltage signal H of high level, then source electrode drive circuit exports the source drive signal Sn compared with high driving ability, when driving force selects input end to receive low level voltage signal L, then source electrode drive circuit exports the source drive signal Sn of lower driving force, but the driving force of the source electrode drive circuit of prior art selects input end to be receive the voltage signal H of high level or low level voltage signal L regularly, automatically can not switch according to the size of load, very flexible.
Therefore, be necessary to provide the technical scheme of improvement to overcome the above technical matters existed in prior art.
Summary of the invention
The main technical problem to be solved in the present invention is to provide a kind of drive current control switching circuit, and it automatically can control drive current and switch according to the size of display panel and load, and dirigibility is high.
The invention provides a kind of drive current control switching circuit, driving circuit drives display panel according to DC input voitage output driving current, described drive current control switching circuit is for controlling the size of the drive current of described driving circuit output, and described drive current control switching circuit comprises current sense unit, comparing unit.The described electric current detected for detecting the size of current on described control switching circuit, and is converted to detecting voltage by described current sense unit.Described comparing unit is used for the size of more described detecting voltage and reference voltage, and controls the size of the drive current that described driving circuit exports according to comparative result output high level or low level control signal.
Further, described current sense unit comprises detecting resistance, and the first end of described detecting resistance receives described DC input voitage, and the second end of described detecting resistance is connected with described display panel.
Further, described current sense unit also comprises the first filter resistance, the second filter resistance, filter capacitor, amplifier.The first end of described first filter resistance is connected with the first end of described detecting resistance.The first end of described second filter resistance is connected with the second end of described detecting resistance.Described filter capacitor is connected between the second end of described first filter resistance and the second end of described second filter resistance.The first input end of described amplifier is connected with the second end of described first filter resistance, and the second input end of described amplifier is connected with the second end of described second filter resistance, and the output terminal of described amplifier is connected with described comparing unit.
Further, described comparing unit comprises the first divider resistance, the second divider resistance, comparer.The first end of described first divider resistance is connected with described current sense unit.The first end of described second divider resistance is connected with the second end of described first divider resistance, the second end ground connection of described second divider resistance.The positive input of described comparer is connected with the second end of described first divider resistance, and the negative input of described comparer receives described reference voltage, and the output terminal of described comparer is connected with described driving circuit.
The present invention also provides a kind of display device, and described display device comprises display panel, driving circuit and above-mentioned drive current control switching circuit.
Drive current control switching circuit of the present invention and display device automatically can control drive current and switch according to the size of display panel and load, and dirigibility is high.
By the detailed description below with reference to accompanying drawing, other side of the present invention and feature become obvious.But it should be known that accompanying drawing is only the object design of explanation, instead of as the restriction of scope of the present invention, this is because it should with reference to additional claim.Should also be appreciated that, unless otherwise noted, unnecessaryly draw accompanying drawing to scale, they only try hard to structure described herein and flow process are described conceptually.
Accompanying drawing explanation
Fig. 1 is the module diagram of the source electrode drive circuit of prior art.
Fig. 2 is the module diagram of the drive current control switching circuit of an embodiment of the present invention.
Fig. 3 is the electrical block diagram of the drive current control switching circuit of an embodiment of the present invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Although the present invention uses first, second, third, etc. term to describe different elements, signal, port, assembly or part, these elements, signal, port, assembly or part be not by the restriction of these terms.These terms are only used to an element, signal, port, assembly or part and another element, signal, port, assembly or part to make a distinction.In the present invention, element, port, assembly or a part and another element, port, assembly or part " being connected ", " connection ", can be understood as direct electric connection, or also can be understood as the indirect electric connection that there is intermediary element.Unless otherwise defined, otherwise all terms used in the present invention (comprising technical term and scientific terminology) have the meaning usually understood with those skilled in the art.
Fig. 2 is the module diagram of the drive current control switching circuit of an embodiment of the present invention.As shown in Figure 2, driving circuit 100 drives display panel 101 according to DC input voitage AVDD output driving current Sn.Drive current control switching circuit 102, for controlling the size of the drive current Sn of driving circuit 100 output, can automatically switch according to the display panel 101 i.e. size of load to make driving circuit 100 and export different drive current Sn.
Wherein, DC input voitage AVDD is provided by direct voltage source.
Wherein, driving circuit 100 can be, but not limited to as source electrode drive circuit, to export source electrode drive current.
Particularly, drive current control switching circuit 102 comprises current sense unit 1021, comparing unit 1022.(electric current that current sense unit 1021 detects is larger for detecting on drive current control switching circuit 102 size of current for current sense unit 1021, the electric current then flowing into driving circuit 100 is less, then illustrate that display panel 101 i.e. load is larger), and the electric current detected is converted to detecting voltage.Comparing unit 1022 for comparing the size of detecting voltage and reference voltage, and exports the size of the drive current Sn of high level or the output of low level control signal control driving circuit 100 according to comparative result.
Fig. 3 is the electrical block diagram of the drive current control switching circuit of an embodiment of the present invention.As shown in Figure 3, current sense unit 1021 comprises detecting resistance Rs, and the first end of detecting resistance Rs receives DC input voitage AVDD, and second end of detecting resistance Rs is connected with display panel 101.
Current sense unit 1021 can also but be not limited to comprise the first filter resistance RF1, the second filter resistance RF2, filter capacitor CF, amplifier G.The first end of the first filter resistance RF1 is connected with the first end of detecting resistance Rs.The first end of the second filter resistance RF2 is connected with second end of detecting resistance Rs.Filter capacitor CF is connected between second end of the first filter resistance RF1 and second end of the second filter resistance RF2.The first input end Vin1+ of amplifier G is connected with second end of the first filter resistance RF1, and the second input end Vin1-of amplifier G is connected with second end of the second filter resistance RF2, and the output end vo ut1 of amplifier G is connected with comparing unit 1022.Certainly it will be appreciated by those skilled in the art that, the first input end Vin1+ of the amplifier G of current sense unit 1021 and the two ends of the second input end Vin1-also can directly be connected with the first end of detecting resistance Rs, the second end of detecting resistance Rs respectively.
Comparing unit 1022 comprises the first divider resistance R1, the second divider resistance R2, comparer COM.The first end of the first divider resistance R1 is connected with current sense unit 1021.The first end of the second divider resistance R2 is connected with second end of the first divider resistance R1, the second end ground connection of the second divider resistance R2.The positive input Vin2+ of comparer COM is connected with second end of the first divider resistance R1, and the negative input Vin2-of comparer COM receives reference voltage V
ref, the output end vo ut2 of comparer COM is connected with driving circuit 100.Certainly it will be appreciated by those skilled in the art that, the positive input Vin2+ of comparer COM also can directly be connected with the output end vo ut1 of amplifier G.
Particularly, when display panel 101 i.e. load is comparatively large, the voltage so detecting resistance Rs two ends can be comparatively large, and therefore amplifier G exports larger magnitude of voltage, comparer COM exports the control signal of high level, exports higher drive current driving load to control driving circuit 100; When display panel 101 i.e. load is less, the voltage so detecting resistance Rs two ends can be less, and therefore amplifier G exports less magnitude of voltage, the control signal of comparer COM output low level, exports lower drive current driving load to control driving circuit 100.Therefore drive current control switching circuit 102 of the present invention can control according to the display panel 101 i.e. size of load the drive current that driving circuit 100 automatic switchover exports different size, dirigibility is high.
The present invention also provides a kind of display device, and display device comprises display panel, driving circuit and above-mentioned drive current control switching circuit.As shown in Figure 2, driving circuit 100 drives display panel 101 according to DC input voitage AVDD output driving current Sn.Drive current control switching circuit 102, for controlling the size of the drive current Sn of driving circuit 100 output, can automatically switch according to the display panel 101 i.e. size of load to make driving circuit 100 and export the drive current Sn of different size.
Wherein, DC input voitage AVDD is provided by direct voltage source.
Wherein, driving circuit 100 can be, but not limited to as source electrode drive circuit, to export source electrode drive current.
Particularly, drive current control switching circuit 102 comprises current sense unit 1021, comparing unit 1022.(electric current that current sense unit 1021 detects is larger for detecting the electric current of the size of current flowed on drive current control switching circuit 102 for current sense unit 1021, the electric current then flowing into driving circuit 100 is less, then illustrate that display panel 101 i.e. load is larger), and the electric current detected is converted to detecting voltage.Comparing unit 1022 for comparing the size of detecting voltage and reference voltage, and exports the size of the drive current Sn of high level or the output of low level control signal control driving circuit 100 according to comparative result.
Drive current control switching circuit of the present invention and display device automatically can control drive current and switch according to the size of display panel and load, and dirigibility is high.
Apply specific case herein to set forth drive current control switching circuit of the present invention and display device and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention; all will change in specific embodiments and applications; to sum up, this description should not be construed as limitation of the present invention, and protection scope of the present invention should be as the criterion with appended claim.
Claims (5)
1. the control circuit of a drive current switching, it is characterized in that, driving circuit drives display panel according to DC input voitage output driving current, described drive current control switching circuit is for controlling the size of the drive current of described driving circuit output, and described drive current control switching circuit comprises:
Current sense unit, the described electric current detected for detecting the size of current on described drive current control switching circuit, and is converted to detecting voltage by described current sense unit;
Comparing unit, described comparing unit is used for the size of more described detecting voltage and reference voltage, and controls the size of the drive current that described driving circuit exports according to comparative result output high level or low level control signal.
2. drive current control switching circuit as claimed in claim 1, it is characterized in that, described current sense unit comprises:
Detecting resistance, the first end of described detecting resistance receives described DC input voitage, and the second end of described detecting resistance is connected with described display panel.
3. drive current control switching circuit as claimed in claim 2, it is characterized in that, described current sense unit also comprises:
First filter resistance, the first end of described first filter resistance is connected with the first end of described detecting resistance;
Second filter resistance, the first end of described second filter resistance is connected with the second end of described detecting resistance;
Filter capacitor, described filter capacitor is connected between the second end of described first filter resistance and the second end of described second filter resistance;
Amplifier, the first input end of described amplifier is connected with the second end of described first filter resistance, and the second input end of described amplifier is connected with the second end of described second filter resistance, and the output terminal of described amplifier is connected with described comparing unit.
4. drive current control switching circuit as claimed in claim 1, it is characterized in that, described comparing unit comprises:
First divider resistance, the first end of described first divider resistance is connected with described current sense unit;
Second divider resistance, the first end of described second divider resistance is connected with the second end of described first divider resistance, the second end ground connection of described second divider resistance;
Comparer, the positive input of described comparer is connected with the second end of described first divider resistance, and the negative input of described comparer receives described reference voltage, and the output terminal of described comparer is connected with described driving circuit.
5. a display device, is characterized in that, described display device comprises display panel, driving circuit and the drive current control switching circuit as described in Claims 1-4 any one.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510982111.1A CN105405425B (en) | 2015-12-24 | 2015-12-24 | A kind of driving current control switching circuit and display device |
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| CN201510982111.1A CN105405425B (en) | 2015-12-24 | 2015-12-24 | A kind of driving current control switching circuit and display device |
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| CN105405425A true CN105405425A (en) | 2016-03-16 |
| CN105405425B CN105405425B (en) | 2018-09-18 |
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| WO2018188175A1 (en) * | 2017-04-11 | 2018-10-18 | 惠科股份有限公司 | Overcurrent protection circuit, display panel, and display apparatus |
| CN113178167A (en) * | 2021-04-16 | 2021-07-27 | Tcl华星光电技术有限公司 | Display panel and driving method thereof |
| CN113342105A (en) * | 2021-06-03 | 2021-09-03 | 昆山国显光电有限公司 | Power supply adjusting device and method of display panel and display device |
| CN115762431A (en) * | 2022-09-26 | 2023-03-07 | 惠科股份有限公司 | A driving circuit, a driving method, and a display device of a display panel |
| WO2023246532A1 (en) * | 2022-06-23 | 2023-12-28 | 华为技术有限公司 | Processing circuit, processing method, display apparatus, and electronic device |
| WO2024259591A1 (en) * | 2023-06-20 | 2024-12-26 | 威刚科技股份有限公司 | Power adjustment system and method |
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| CN115762431A (en) * | 2022-09-26 | 2023-03-07 | 惠科股份有限公司 | A driving circuit, a driving method, and a display device of a display panel |
| WO2024259591A1 (en) * | 2023-06-20 | 2024-12-26 | 威刚科技股份有限公司 | Power adjustment system and method |
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| CN105405425B (en) | 2018-09-18 |
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