CN109036313A - Voltage generation circuit and display device - Google Patents
Voltage generation circuit and display device Download PDFInfo
- Publication number
- CN109036313A CN109036313A CN201810968139.3A CN201810968139A CN109036313A CN 109036313 A CN109036313 A CN 109036313A CN 201810968139 A CN201810968139 A CN 201810968139A CN 109036313 A CN109036313 A CN 109036313A
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- Prior art keywords
- branch
- generation circuit
- voltage generation
- comparator
- switch
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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
- G09G3/3696—Generation of voltages supplied to electrode drivers
Abstract
This application discloses a kind of voltage generation circuit and display devices.The voltage generation circuit is for providing supply voltage, including signal detection module, for detecting frame synchronizing signal and exporting detecting result；And branch selecting module, it is connected with the signal detection module, including the first branch and second branch, the branch selecting module selects one of the first branch and second branch come the supply voltage according to the detecting result, wherein including current-limiting resistance in the first branch.Above-mentioned voltage generation circuit selects a branch to generate supply voltage by the state of detecting frame synchronizing signal, it is conditioned so that supply voltage acts on the load current exported when load according to the state of frame synchronizing signal, ensure that the normal display effect of display device and working condition.
Description
Technical field
The present invention relates to field of display technology, more particularly, to voltage generation circuit and display device.
Background technique
Display device in daily life using more and more extensive, the stability for further displaying device is concerned.
Waveform diagram of the display device of the prior art when showing heavily loaded picture as shown in figure 1.Source electrode driver connects
When receipts act on its output loading by simulation supply voltage AVDD, load current I_AVDD will be generated, simulation supplies in the prior art
Piezoelectric voltage AVDD is directly powered by analog voltage.As shown in Figure 1, each frame display at the beginning of, frame synchronizing signal STV by
Low level is got higher, and the modules of source electrode driver are all started to work, when the first row data are when overloaded, to be transmitted to source drive
The load current I_AVDD of device can instantaneously increase, and input voltage vin is caused to be pulled low, when load current I_AVDD is increased to centainly
When value, input voltage vin is lower than a certain value, and late-class circuit is locked, and causing late-class circuit to be protected can not work normally, in turn
Cause picture display abnormal.
Therefore, it is necessary to provide improved technical solution to overcome the above-mentioned technical problems in the prior art.
Summary of the invention
In view of this, the main technical problem to be solved in the present invention is to provide a kind of voltage generation circuit and display device,
Load current increase causes picture display abnormal in turn caused by preventing display device from showing overloading data because of frame picture.
According to an aspect of the present invention, a kind of voltage generation circuit is provided, for providing supply voltage, which is characterized in that
The voltage generation circuit includes signal detection module, for detecting frame synchronizing signal and exporting detecting result；And branch choosing
Module is selected, is connected with the signal detection module, including the first branch and second branch, the branch selecting module is according to
Detecting result selects one of the first branch and second branch to carry out the supply voltage, wherein including current limliting electricity in the first branch
Resistance.
Preferably, the signal detection module includes comparator, and the comparator first input end receives the frame synchronization
Signal, second input terminal of comparator receive fixed voltage, and the output end of the comparator exports the detecting result.
Preferably, the branch selecting module is arranged to when the detecting result be high level and low level a period of time, institute
State the work of one of the first branch and the second branch.
Preferably, the first branch includes: first resistor, and the first resistor is current-limiting resistance；First switch tube, institute
The control terminal for stating first switch tube receives the detecting result, and the first path terminal of the first switch tube passes through first electricity
Resistance is connect with the first power end of the comparator, the alternate path end ground connection of the first switch tube；Third switching tube, it is described
The control terminal of third switching tube connects the first path terminal of the first switch tube, and the alternate path end of the third switching tube connects
First voltage source is connect, the first path terminal of the third switching tube is the output end of the first branch；And second resistance, one
End connects the control terminal of the first switch tube, other end ground connection.
Preferably, the second branch includes: second switch, and the control terminal of the second switch receives the detecting
As a result, the alternate path end of the second switch connects the second voltage source, the first path terminal of the second switch is institute
State the output end of second branch.
Preferably, the first switch tube is NMOS transistor, and the third opens the light pipe for PMOS transistor.
Preferably, the second switch is PMOS transistor.
Preferably, the signal detection module further include: delay unit, by the received frame synchronizing signal delay output
To the comparator.
Preferably, the delay unit includes: 3rd resistor, and the frame synchronizing signal is transmitted to by the 3rd resistor
The first input end of the comparator；And capacitor, one end connect the 3rd resistor and the comparator first input end
Intermediate node, other end ground connection.
According to another aspect of the present invention, a kind of display device is provided, comprising: sequence controller exports frame synchronizing signal,
And voltage generation circuit described above.
For display device disclosed by the invention comprising voltage generation circuit when a frame picture starts display, voltage generates electricity
When road acts on output loading by the supply voltage that the first branch with metering function exports, the raised amplitude of load current
It reduces, had not only realized the normal display of display device, but also the degree that input voltage is pulled low is obviously reduced, and then rear class electricity
The not locked protection in road operates normally.When a frame picture does not start display, voltage generation circuit is exported by second branch
Supply voltage can guarantee that the source electrode driver of display device works normally.
Detailed description of the invention
By referring to the drawings to the description of the embodiment of the present invention, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from, in the accompanying drawings:
Fig. 1 shows waveform diagram of the display device when showing heavily loaded picture according to prior art；
Fig. 2 shows the structural schematic diagrams of display device according to an embodiment of the present invention；
Fig. 3 shows the schematic diagram of voltage generation circuit in display device according to an embodiment of the present invention；
Fig. 4 shows waveform diagram of the display device according to an embodiment of the present invention when showing heavily loaded picture.
Specific embodiment
Hereinafter reference will be made to the drawings, and the present invention will be described in more detail.In various figures, identical element is using similar attached
Icon is remembered to indicate.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.Furthermore, it is possible to be not shown certain
Well known part.
Many specific details of the invention, such as structure, material, size, the processing work of device is described hereinafter
Skill and technology, to be more clearly understood that the present invention.But it just as the skilled person will understand, can not press
The present invention is realized according to these specific details.
The present invention can be presented in a variety of manners, some of them embodiment explained below.
Fig. 2 shows the structural schematic diagrams of display device according to an embodiment of the present invention.
As shown in Fig. 2, the display device of the embodiment of the present invention includes: voltage generation circuit 100, source electrode driver 200, grid
Driver 300, sequence controller 400 and panel 500, display device is, for example, liquid crystal display dress in the embodiment of the present invention
It sets.
Sequence controller 400 is respectively according to control signal CTRL and frame synchronizing signal STV to source electrode driver 200 and grid
Driver 300 exports source data and gate data.Display panel 500 passes through gate lines G L1-GLn connection gate drivers 300
To receive gate drive signal, display panel 500 receives source drive by data line SL1-SLn connection source electrode driver 400
Signal.Gate drive signal controls the display panel the on-off of thin film transistor (TFT) in 500, and source drive signal controls source data
Output, thin film transistor (TFT) is connected and exports source data and then display panel 500 shows image.
Wherein, voltage generation circuit 100 includes signal detection module 110 and branch selecting module 120, signal detection mould
Block 110 is for example including delay unit 111 and comparator 112, and branch selecting module 121 is for example including the first branch 121 and
Two branches 122.
At work, the signal detection module 110 of voltage generation circuit 100 connects sequence controller 400 and receives frame synchronization
Signal STV.When frame synchronizing signal STV is high level, such as starts a frame picture and show.Signal detection module 110 connects at this time
It receives frame synchronizing signal STV to enter comparator 112 by the delay of delay unit 111 and export high level, branch selecting module 120 connects
Receiving high level makes the first branch 121 work, and second branch 122 disconnects, the simulation supply voltage obtained by the first branch 121
AVDD acts on its output loading, generates load current I_AVDD, and the metering function of the first branch 121 makes load current I_
AVDD decrease to some degree ensure that the normal display effect of display device.When frame synchronizing signal STV is low level,
Such as non-start frame picture is shown.Signal detection module 110 receives frame synchronizing signal STV and is delayed by delay unit 111 at this time
Into comparator 112 and low level is exported, branch selecting module 120 receives low level and second branch 122 is worked, and first
Road 121 disconnects, and the simulation supply voltage AVDD that level generation circuit 100 is obtained by second branch 122 is exported to source electrode driver
200, to guarantee that source electrode driver 200 works normally.
The state for the frame synchronizing signal STV that above-mentioned voltage generation circuit 100 is obtained by detecting selects a branch to generate
Supply voltage AVDD is simulated, so that the load current I_AVDD of output is conditioned according to the state of frame synchronizing signal STV, is protected
The normal display effect of display device and working condition are demonstrate,proved.
Fig. 3 shows the schematic diagram of voltage generation circuit in display device according to an embodiment of the present invention.
As shown in figure 3, voltage generation circuit 100 includes delay unit 111, comparator 112, the first branch 121 and the
Two branches 122.
Delay unit 111 includes the 3rd resistor R3 and capacitor C1 being sequentially connected in series, and 3rd resistor R3 receives frame synchronizing signal
STV, capacitor C1 ground connection, for the output frame synchronizing signal STV that is delayed.The first input end of comparator 112 connects first resistor R1
It is simultaneously grounded with the first power end connection tertiary voltage source V3 of the intermediate node of capacitor C1, comparator 112, the of comparator 112
By the 4th voltage source V4 connection between two input terminals and second source end, the cathode of the 4th voltage source V4 is grounded, comparator 112
Output end connect the 4th resistance R4, comparator 112 be used for detect frame synchronizing signal STV state and export result.First
Road 121 includes first switch tube Q1, third switching tube Q3, first resistor R1 and second resistance R2, the control of first switch tube Q1
End processed connects the 4th resistance R4, the control terminal of the first path terminal connection third switching tube Q3 of first switch tube Q1, third switch
The alternate path end connection first voltage source V1 of pipe Q3 is simultaneously grounded, the alternate path end ground connection of first switch tube Q1, first resistor
R1 is connected between the first path terminal of first switch tube Q1 and the first power end of comparator U1, the connection of the one end second resistance R2
Between the 4th resistance R4 and the control terminal of first switch tube Q1, other end ground connection, wherein the first access of third switching tube Q3
The output end as the first branch 121 is held, the first branch 121 has metering function.Second branch 122 includes second switch
The control terminal of Q2, second switch Q2 connect second resistance R2, and the alternate path end of second switch Q2 connects the second voltage source
V2 is simultaneously grounded, wherein output end of the first path terminal of second switch Q2 as second branch 122.The first branch 121 and
The output end of two branches 122 exports supply voltage AVDD by the 5th resistance R5.The first branch 121 and 122 groups of second branch
At branch selecting module, so that different conditions of the voltage generation circuit in frame synchronizing signal STV export difference by different branch
Supply voltage AVDD, and then ensure that display device can work normally and show.
In the present embodiment, 3rd resistor R3 is, for example, variable resistance and then adjusts delay parameter in range.First resistor
R1 is the current-limiting resistance in the first branch.4th resistance is protective resistance.The first input end of comparator 112 is, for example, that anode is defeated
Enter end, the second input terminal is, for example, negative input, and the first power end is, for example, cathode power supply end, and second source end is for example negative
Pole power end.First switch tube Q1 is, for example, N-type MOS transistor, and second switch Q2 and third switching tube Q3 are, for example, p-type
MOS transistor, the control terminal of switching tube are, for example, the grid of transistor, and the alternate path end of switching tube is, for example, the source of transistor
Pole, the first path terminal of switching tube are, for example, the drain electrode of transistor.First voltage source and the second voltage source for example provide identical
Voltage.The present embodiment defines that the present invention will be described in more detail, and of the invention is practiced without limitation to the present embodiment.
The voltage generation circuit of the present embodiment at work, open when frame synchronizing signal STV is, for example, high level by display device
The frame picture that begins is shown.When frame synchronizing signal STV is high level, comparator 112 exports high level, i.e. is high level at node A,
Second switch Q2 disconnects first switch tube Q1 conducting at this time, i.e. second branch 122 disconnects the first branch 121 and works.First electricity
Resistance R1 shields to first switch tube Q1 current limliting, and draws high the level at node B, and then controls Q4 conducting, first voltage
Source V1 provides voltage and exports supply voltage AVDD by the 5th resistance R5, by exporting after current limliting processing in the first branch 121
Supply voltage AVDD when acting on its output loading, the load current I_AVDD of generation is reduced.Frame synchronizing signal STV is low electricity
Usually, comparator 112 exports low level, i.e. is low level at node A, first switch tube Q1 disconnects second switch Q2 and leads at this time
Logical, i.e., the work of second branch 122 first branch 121 disconnects.Second switch Q2 conducting, the second voltage source V2 provide voltage and lead to
The 5th resistance R5 output supply voltage AVDD is crossed, the supply voltage AVDD exported by second branch 122 can guarantee display dress
The source electrode driver when not starting frame picture display is set to work normally.
Fig. 4 shows waveform diagram of the display device according to an embodiment of the present invention when showing heavily loaded picture.
In conjunction with shown in Fig. 1, Fig. 4, when the first row data heavy duty, the display device that the prior art provides is starting a frame picture
The average value of load current I_AVDD is, for example, 812.0mA when display, and display device provided by the invention is starting a frame picture
The average value of load current I_AVDD is, for example, 192.0mA when display.And after load current I_AVDD is reduced, display device
In the degree that is pulled low of input voltage vin be obviously reduced.
Therefore when a frame picture starts display, voltage generation circuit passes through with current limliting display device provided by the invention
When the supply voltage AVDD of the first branch output of effect acts on output loading, the raised amplitude drop of load current I_AVDD
It is low, the normal display of display device was not only realized, but also the degree that input voltage vin is pulled low is obviously reduced, and then rear class
The not locked protection of circuit operates normally.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
It is as described above according to the embodiment of the present invention, these embodiments details all there is no detailed descriptionthe, also not
Limiting the invention is only the specific embodiment.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is principle and practical application in order to better explain the present invention, thus belonging to making
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.
Claims (10)
1. a kind of voltage generation circuit, for providing supply voltage, which is characterized in that the voltage generation circuit includes:
Signal detection module, for detecting frame synchronizing signal and exporting detecting result；And
Branch selecting module is connected with the signal detection module, including the first branch and second branch, and the branch selects mould
Root tuber carrys out the supply voltage according to the detecting result selection one of the first branch and second branch, wherein in the first branch
Including current-limiting resistance.
2. voltage generation circuit according to claim 1, which is characterized in that the signal detection module includes:
Comparator, the comparator first input end receive the frame synchronizing signal, and second input terminal of comparator receives solid
The output end of constant voltage, the comparator exports the detecting result.
3. voltage generation circuit according to claim 1, which is characterized in that the branch selecting module is arranged to when described
Detecting result is high level and low level a period of time, the work of one of the first branch and the second branch.
4. voltage generation circuit according to claim 1, which is characterized in that the first branch includes:
First resistor, the first resistor are current-limiting resistance；
First switch tube, the control terminal of the first switch tube receive the detecting result, and the first of the first switch tube is logical
Terminal is connect by the first resistor with the first power end of the comparator, the alternate path termination of the first switch tube
Ground；
The control terminal of third switching tube, the third switching tube connects the first path terminal of the first switch tube, the third
The alternate path end of switching tube connects first voltage source, and the first path terminal of the third switching tube is the defeated of the first branch
Outlet；And
Second resistance, one end connect the control terminal of the first switch tube, other end ground connection.
5. voltage generation circuit according to claim 1, which is characterized in that the second branch includes:
Second switch, the control terminal of the second switch receive the detecting result, and the second of the second switch is logical
Terminal connects the second voltage source, and the first path terminal of the second switch is the output end of the second branch.
6. voltage generation circuit according to claim 4, which is characterized in that the first switch tube is NMOS transistor,
The third opens the light pipe for PMOS transistor.
7. voltage generation circuit according to claim 5, which is characterized in that the second switch is PMOS transistor.
8. voltage generation circuit according to claim 1, which is characterized in that the signal detection module further include:
Delay unit, by the received frame synchronizing signal delay output to the comparator.
9. voltage generation circuit according to claim 8, which is characterized in that the delay unit includes:
3rd resistor, the frame synchronizing signal are transmitted to the first input end of the comparator by the 3rd resistor；And
Capacitor, one end connect the intermediate node of the 3rd resistor and the comparator first input end, other end ground connection.
10. a kind of display device, comprising:
Sequence controller exports frame synchronizing signal, which is characterized in that the display device further include:
The described in any item voltage generation circuits of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810968139.3A CN109036313A (en) | 2018-08-23 | 2018-08-23 | Voltage generation circuit and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810968139.3A CN109036313A (en) | 2018-08-23 | 2018-08-23 | Voltage generation circuit and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109036313A true CN109036313A (en) | 2018-12-18 |
Family
ID=64628211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810968139.3A Pending CN109036313A (en) | 2018-08-23 | 2018-08-23 | Voltage generation circuit and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109036313A (en) |
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| CN111223461A (en) * | 2020-01-16 | 2020-06-02 | 昆山龙腾光电股份有限公司 | Voltage regulating circuit and display device |
| CN113992005A (en) * | 2021-10-18 | 2022-01-28 | Tcl华星光电技术有限公司 | Display power supply module and display device |
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| CB02 | Change of applicant information |
Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant after: Kunshan Longteng Au Optronics Co. Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant before: INFOVISION OPTOELECTRONICS (KUNSHAN) Co.,Ltd. |
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Application publication date: 20181218 |
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