CN105405425B - A kind of driving current control switching circuit and display device - Google Patents
A kind of driving current control switching circuit and display device Download PDFInfo
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- CN105405425B CN105405425B CN201510982111.1A CN201510982111A CN105405425B CN 105405425 B CN105405425 B CN 105405425B CN 201510982111 A CN201510982111 A CN 201510982111A CN 105405425 B CN105405425 B CN 105405425B
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- 230000005611 electricity Effects 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 5
- 230000011664 signaling Effects 0.000 abstract 1
- 239000004973 liquid crystal related substance Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000010409 thin film Substances 0.000 description 6
- 101100112673 Rattus norvegicus Ccnd2 gene Proteins 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010408 film Substances 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 present invention provides a kind of driving current control switching circuits, driving circuit drives display panel according to DC input voitage output driving current, the driving current control switching circuit is used to control the size of the driving current of the driving circuit output, and the driving current control switching circuit includes current sense unit, comparing unit.The current sense unit is used to detect the size of current on the driving current control switching circuit, and the electric current detected is converted to detecting voltage.Size of the comparing unit for the detecting voltage and reference voltage, and high level or the low level size for controlling signal and controlling the driving current of the driving circuit output are exported according to comparison result.The present invention also provides a kind of display device using above-mentioned driving current control switching circuit, driving current control switching circuit of the invention and display device can automatically control driving current and be switched over according to the size that display panel loads, and flexibility is high.
Description
Technical field
The present invention relates to a kind of liquid panel technique field, more particularly to a kind of driving current control switching circuit and display
Device.
Background technology
Liquid crystal display device (Liquid Crystal Display, LCD) has frivolous, energy saving, radiationless etc. many excellent
Point, therefore gradually replaced traditional cathode-ray tube (CRT) display.Liquid crystal display is widely used in height at present
The electronics such as clear DTV, desktop computer, personal digital assistant (PDA), laptop, mobile phone, digital camera
In equipment.
By taking thin film transistor (TFT) (Thin Film Transistor, TFT) liquid crystal display device as an example comprising：Liquid crystal
Show panel and driving circuit, wherein liquid crystal display panel includes a plurality of grid line and multiple data lines, and two adjacent grids
Line intersects to form a pixel unit with two adjacent data lines, and each pixel unit includes at least a thin film transistor (TFT).
And driving circuit includes：Gate driving circuit (gate drive circuit) and source electrode drive circuit (source drive
circuit)。
The basic functional principle of liquid crystal display panel and driving circuit is：Gate driving circuit with grid line by electrically connecting
Pulling up transistor for connecing sends out gate drive signal to grid line, sequentially opens the TFT of every a line, then by source drive electricity
The pixel unit of one full line is charged to respectively required voltage by road simultaneously, to show different grayscale.I.e. first by the first row
Gate driving circuit by its pull up transistor (output stage thin film transistor (TFT)) thin film transistor (TFT) of the first row is opened, then
It is charged to the pixel unit of the first row by source electrode drive circuit.When the pixel unit of the first row is charged, gate driving electricity
The row thin film transistor (TFT) is just closed in road, and then the gate driving circuit of the second row is pulled up transistor by it by the thin of the second row
Film transistor is opened, then carries out charge and discharge by the pixel unit of the second row of source electrode drive circuit pair.So sequentially go down, when substituting the bad for the good
The pixel unit of last column, just starts to charge up from the first row again.
Fig. 1 is the module diagram of the source electrode drive circuit of the prior art.As shown in Figure 1, source electrode drive circuit includes electricity
Source input terminal, power input are used to receive the DC voltage AVDD of direct voltage source output.Further, since display panel is not
It is different with the electric current of different sizes and making consumption of i.e. load under picture, in order to increase the flexibility of source electrode drive circuit, source
There is pole driving circuit driving capability to select input terminal.When driving capability selection input terminal receives the voltage signal H of high level
When, then source electrode drive circuit exports the source drive signal Sn compared with high driving ability, when driving capability selection input terminal receives
When low level voltage signal L, then source electrode drive circuit exports the source drive signal Sn of relatively low driving capability, but the prior art
Source electrode drive circuit driving capability selection input terminal be fixedly receive high level voltage signal H or low level voltages
Signal L cannot automatically be switched over according to the size of load, and flexibility is poor.
Therefore, it is necessary to provide improved technical solution to overcome the above technical problem existing in the prior art.
Invention content
The main technical problem to be solved in the present invention is to provide a kind of driving current control switching circuit, can automatically control
Driving current is that the size loaded switches over according to display panel, and flexibility is high.
The present invention provides a kind of driving current control switching circuits, and driving circuit is according to DC input voitage output driving
Electric current drives display panel, the driving current control switching circuit to be used to control the driving current of the driving circuit output
Size, the driving current control switching circuit include current sense unit, comparing unit.The current sense unit is for detecing
The size of current on the control switching circuit is surveyed, and the electric current detected is converted into detecting voltage.It is described relatively more single
Size of the member for the detecting voltage and reference voltage, and high level or low level control are exported according to comparison result
Signal controls the size of the driving current of the driving circuit output.
Further, the current sense unit includes detecting resistance, and the first end reception of the detecting resistance is described straight
Input voltage is flowed, the second end of the detecting resistance is connected with the display panel.
Further, the current sense unit further includes the first filter resistance, the second filter resistance, filter capacitor, puts
Big device.The first end of first filter resistance is connected with the first end of the detecting resistance.The of second filter resistance
One end is connected with the second end of the detecting resistance.The filter capacitor is connected to second end and the institute of first filter resistance
Between the second end for stating the second filter resistance.The second end phase of the first input end of the amplifier and first filter resistance
Even, the second input terminal of the amplifier is connected with the second end of second filter resistance, the output end of the amplifier and
The comparing unit is connected.
Further, the comparing unit includes the first divider resistance, the second divider resistance, comparator.Described first point
The first end of piezoresistance is connected with the current sense unit.The first end of second divider resistance and the first partial pressure electricity
The second end of resistance is connected, the second end ground connection of second divider resistance.The positive input of the comparator and described first
The second end of divider resistance is connected, and the negative input of the comparator receives the reference voltage, the output of the comparator
End is connected with the driving circuit.
The present invention also provides a kind of display device, the display device includes display panel, driving circuit and above-mentioned drive
Streaming current control switching circuit.
The driving current control switching circuit and display device of the present invention can automatically control driving current according to display panel
The size loaded switches over, and flexibility is high.
Through the following detailed description with reference to the accompanying drawings, other aspects of the invention and feature become apparent.But it should know
Road, attached drawing be only explain purpose design, not as the restriction of the scope of the present invention, this is because its should refer to it is attached
The claim added.It should also be noted that unless otherwise noted, it is not necessary to which scale attached drawing, they only try hard to conceptually
Illustrate structure and flow described herein.
Description of the drawings
Fig. 1 is the module diagram of the source electrode drive circuit of the prior art.
Fig. 2 is the module diagram of the driving current control switching circuit of an embodiment of the present invention.
Fig. 3 is the electrical block diagram of the driving current control switching circuit of an embodiment of the present invention.
Specific implementation mode
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings to the present invention
Specific implementation mode be described in detail.
Although the present invention describes different elements, signal, port, component or portion using the first, second, third, etc. term
Point, but these elements, signal, port, component or part are not limited by these terms.These terms are intended merely to one
A element, signal, port, component or part are distinguished with another element, signal, port, component or part.In the present invention
In, an element, port, component or part and another element, port, component or part " connected ", " connection ", it is possible to understand that
To be directly electrically connected, or it can be appreciated that there are the indirect electric connections of intermediary element.Unless otherwise defined, this
All terms (including technical terms and scientific terms) used in invention have and ordinary skill people of the art
The normally understood meaning of member institute.
Fig. 2 is the module diagram of the driving current control switching circuit of an embodiment of the present invention.As shown in Fig. 2, driving
Dynamic circuit 100 drives display panel 101 according to DC input voitage AVDD output driving currents Sn.Driving current switching control electricity
Road 102 is used to control the size of the driving current Sn of the output of driving circuit 100, so that driving circuit 100 can be according to display surface
Plate 101 is that the size loaded automatically switches to export different driving 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 driving current.
Specifically, driving current control switching circuit 102 includes current sense unit 1021, comparing unit 1022.Electric current
Detecting unit 1021 is used to detect the size of current on driving current control switching circuit 102, and (current sense unit 1021 is detected
The electric current arrived is bigger, then the electric current for flowing into driving circuit 100 is smaller, then it is bigger to illustrate that display panel 101 loads), and will detect
The electric current measured is converted to detecting voltage.Size of the comparing unit 1022 for comparing detecting voltage and reference voltage, and according to
Comparison result exports the size for the driving current Sn that high level or low level control signal control drive circuit 100 export.
Fig. 3 is the electrical block diagram of the driving current control switching circuit of an embodiment of the present invention.Such as Fig. 3 institutes
Show, current sense unit 1021 includes detecting resistance Rs, and the first end of detecting resistance Rs receives DC input voitage AVDD, detecting
The second end of resistance Rs is connected with display panel 101.
Current sense unit 1021 can with but be not limited to include the first filter resistance RF1, the second filter resistance RF2, filter
Wave capacitance CF, amplifier G.The first end of first filter resistance RF1 is connected with the first end of detecting resistance Rs.Second filter resistance
The first end of RF2 is connected with the second end of detecting resistance Rs.Filter capacitor CF be connected to the second end of the first filter resistance RF1 with
Between the second end of second filter resistance RF2.The second end of the first input end Vin1+ of amplifier G and the first filter resistance RF1
It is connected, the second input terminal Vin1- of amplifier G is connected with the second end of the second filter resistance RF2, the output end of amplifier G
Vout1 is connected with comparing unit 1022.Certainly it will be appreciated by those skilled in the art that, current sense unit 1021 is put
The both ends of the first input end Vin1+ and the second input terminal Vin1- of big device G can also directly respectively with detecting resistance Rs the
One end, the second end of detecting resistance Rs are connected.
Comparing unit 1022 includes the first divider resistance R1, the second divider resistance R2, comparator COM.First divider resistance
The first end of R1 is connected with current sense unit 1021.The first end of second divider resistance R2 and the second of the first divider resistance R1
End is connected, the second end ground connection of the second divider resistance R2.The positive input Vin2+ of comparator COM and the first divider resistance R1
Second end be connected, the negative input Vin2- of comparator COM receives reference voltage VRef, the output end of comparator COM
Vout2 is connected with driving circuit 100.Certainly it will be appreciated by those skilled in the art that, the positive input of comparator COM
Vin2+ can also directly be connected with the output end vo ut1 of amplifier G.
Specifically, it when display panel 101 loads larger, then the voltage at detecting resistance Rs both ends can be larger, therefore puts
Big device G exports larger voltage value, and the control signal of comparator COM output high level is higher to control the output of driving circuit 100
Driving current driving load；When display panel 101 load it is smaller, then the voltage at detecting resistance Rs both ends can be smaller, because
This amplifier G exports smaller voltage value, and comparator COM exports low level control signal, to control the output of driving circuit 100
Lower driving current driving load.Therefore the driving current control switching circuit 102 of the present invention can be i.e. negative according to display panel 101
The size control driving circuit 100 of load automatically switches to export different size of driving current, and flexibility is high.
The present invention also provides a kind of display device, display device includes display panel, driving circuit and above-mentioned driving electricity
Flow control switching circuit.As shown in Fig. 2, driving circuit 100 is aobvious according to the Sn drivings of DC input voitage AVDD output driving currents
Show panel 101.Driving current control switching circuit 102 is used to control the size of the driving current Sn of the output of driving circuit 100, with
Driving circuit 100 is enable to automatically switch to export different size of driving current Sn according to the size that display panel 101 loads.
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 driving current.
Specifically, driving current control switching circuit 102 includes current sense unit 1021, comparing unit 1022.Electric current
Detecting unit 1021 is used to detect electric current (the current sense list for flowing into the size of current on driving current control switching circuit 102
The electric current that member 1021 detects is bigger, then the electric current for flowing into driving circuit 100 is smaller, then illustrates that display panel 101 loads and get over
Greatly), and by the electric current detected detecting voltage is converted to.Comparing unit 1022 be used for compare detecting voltage and reference voltage it is big
It is small, and the driving current Sn that high level or low level control signal control drive circuit 100 export is exported according to comparison result
Size.
The driving current control switching circuit and display device of the present invention can automatically control driving current according to display panel
The size loaded switches over, and flexibility is high.
Specific case used herein is to the driving current control switching circuit and display device of the present invention and embodiment party
Formula is expounded, and the explanation of embodiment of above is merely used to help understand the method and its core concept of the present invention；Meanwhile
For those of ordinary skill in the art, according to the thought of the present invention, has change in specific embodiments and applications
Become place, to sum up, the content of the present specification should not be construed as limiting the invention, and protection scope of the present invention should be with appended power
Subject to profit requires.
Claims (4)
1. a kind of control circuit of driving current switching, which is characterized in that driving circuit is according to DC input voitage output driving
Electric current drives display panel, the driving current control switching circuit to be used to control the driving current of the driving circuit output
Size, the driving current control switching circuit include：
Current sense unit, the current sense unit receive the DC input voitage, and the current sense unit is for detecing
The size of current on the driving current control switching circuit is surveyed, and the electric current detected is converted into detecting voltage；
Comparing unit, size of the comparing unit for the detecting voltage and reference voltage, and according to comparison result
Output high level or low level control signal control the size of the driving current of the driving circuit output；
Wherein, the current sense unit includes detecting resistance, and the first end of the detecting resistance receives the direct current input electricity
The second end of pressure, the detecting resistance is connected with the display panel, the voltage at the detecting resistance both ends is converted to described
Detect voltage.
2. the control circuit of driving current switching as described in claim 1, which is characterized in that the current sense unit is also
Including：
First filter resistance, the first end of first filter resistance are connected with the first end of the detecting resistance；
Second filter resistance, the first end of second filter resistance are connected with the second end of the detecting resistance；
Filter capacitor, the filter capacitor are connected to the of the second end of first filter resistance and second filter resistance
Between two ends；
Amplifier, the first input end of the amplifier are connected with the second end of first filter resistance, the amplifier
Second input terminal is connected with the second end of second filter resistance, the output end of the amplifier and the comparing unit phase
Even.
3. the control circuit of driving current as described in claim 1 switching, which is characterized in that the comparing unit includes：
First divider resistance, the first end of first divider resistance are connected with the current sense unit；
Second divider resistance, the first end of second divider resistance is connected with the second end of first divider resistance, described
The second end of second divider resistance is grounded；
Comparator, the positive input of the comparator are connected with the second end of first divider resistance, the comparator
Negative input receives the reference voltage, and the output end of the comparator is connected with the driving circuit.
4. a kind of display device, which is characterized in that the display device includes display panel, driving circuit and such as claim 1
To the control circuit of the driving current switching described in 3 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
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| CN105405425A CN105405425A (en) | 2016-03-16 |
| CN105405425B true CN105405425B (en) | 2018-09-18 |
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| CN201510982111.1A Active CN105405425B (en) | 2015-12-24 | 2015-12-24 | A kind of driving current control switching circuit and display device |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106843354B (en) * | 2017-04-11 | 2018-07-17 | 惠科股份有限公司 | Overcurrent protection circuit, display panel and display device |
| CN107038988B (en) * | 2017-06-19 | 2019-11-05 | 京东方科技集团股份有限公司 | Control circuit, display screen, the driving method of display screen and display device |
| 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 |
| CN113342105B (en) * | 2021-06-03 | 2022-11-11 | 昆山国显光电有限公司 | Power supply adjusting device and method of display panel and display device |
| CN117292640A (en) * | 2022-06-23 | 2023-12-26 | 华为技术有限公司 | Processing circuit, processing method, display device and electronic equipment |
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| CN101359456A (en) * | 2007-08-03 | 2009-02-04 | 晨星半导体股份有限公司 | LCD drive g device and drive method |
| CN101794556A (en) * | 2009-02-01 | 2010-08-04 | 晨星软件研发(深圳)有限公司 | Current correction method and control circuit thereof |
| CN103606354A (en) * | 2013-11-25 | 2014-02-26 | 深圳市华星光电技术有限公司 | LED backlight driving circuit and liquid crystal display |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102016153B1 (en) * | 2013-05-10 | 2019-08-30 | 삼성디스플레이 주식회사 | Display device, control device for driving the display device, and control method thereof |
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| CN101135917A (en) * | 2006-08-28 | 2008-03-05 | 联詠科技股份有限公司 | Voltage regulator |
| CN101359456A (en) * | 2007-08-03 | 2009-02-04 | 晨星半导体股份有限公司 | LCD drive g device and drive method |
| CN101794556A (en) * | 2009-02-01 | 2010-08-04 | 晨星软件研发(深圳)有限公司 | Current correction method and control circuit thereof |
| CN103606354A (en) * | 2013-11-25 | 2014-02-26 | 深圳市华星光电技术有限公司 | LED backlight driving circuit and liquid crystal display |
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| CN105405425A (en) | 2016-03-16 |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee after: InfoVision Optoelectronics(Kunshan)Co.,Ltd. Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee before: INFOVISION OPTOELECTRONICS (KUNSHAN) Co.,Ltd. |