CN107045860B - Liquid crystal display, display panel and its Vcom voltage compensation circuit - Google Patents
Liquid crystal display, display panel and its Vcom voltage compensation circuit Download PDFInfo
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- CN107045860B CN107045860B CN201710100357.0A CN201710100357A CN107045860B CN 107045860 B CN107045860 B CN 107045860B CN 201710100357 A CN201710100357 A CN 201710100357A CN 107045860 B CN107045860 B CN 107045860B
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- voltage
- display panel
- differential amplifier
- adjusting unit
- vcom
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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
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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)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses Vcom voltage compensation circuit, display panel and the liquid crystal displays of a kind of display panel, wherein, compensation circuit includes: differential amplifier, the supply voltage Vcom of the positive input terminal input display panel of differential amplifier, negative input end passes through the feedback voltage V feed of first resistor input display panel, and output end exports compensated Vcom voltage；Gain adjusting unit, gain adjusting unit are connected with differential amplifier, and control terminal receives control signal, for the gain according to control signal adjust automatically differential amplifier；The control unit being connected with the control terminal of gain adjusting unit for generating control signal according to Vcom voltage and Vfeed voltage, and control signal is exported to gain adjusting unit.The compensation circuit is not only able to achieve the common mode inhibition of differential amplifier, differential amplification, moreover it is possible to realize the adjust automatically of its gain, and structure is simple, help to reduce circuit-board laying-out area, reduce cost.
Description
Technical field
The present invention relates to liquid crystal display field of display technology, and in particular to a kind of Vcom voltage compensation electricity of display panel
Road, a kind of display panel and a kind of liquid crystal display.
Background technique
With the development of display technology, people are higher and higher to the display effect of display.In order to reach better display
Effect, the general reference voltage (Vcom) using by adjusting liquid crystal molecule deflection compensate multiple to adjust the display of display and imitate
Fruit, Vcom voltage compensate the Vcom voltage compensation circuit realization of multiple selected generally by using single amplifier differential amplifier,
With the compensation multiple of the gain adjustment Vcom voltage by adjusting differential amplifier.But it is used in current Vcom voltage compensation circuit
Single amplifier differential amplifier circuit peripheral circuit it is big, cause electronic component to increase, Layout area is bigger, and economic cost is more
It is high.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
First purpose is to propose a kind of Vcom voltage compensation circuit of display panel.The compensation circuit can not only realize differential put
The common mode inhibition of big device, differential amplification, additionally it is possible to realize the adjust automatically of its gain, and circuit structure is simple, facilitate
The layout area of circuit board is reduced, economic cost is reduced.
Second object of the present invention is to propose a kind of display panel.
Third object of the present invention is to propose a kind of liquid crystal display.
In order to achieve the above objectives, first aspect present invention embodiment proposes a kind of Vcom voltage compensation electricity of display panel
Road, comprising: differential amplifier, the positive input terminal of the differential amplifier and the supply voltage of the display panel provide end phase
Even, the negative input end of the differential amplifier provides end with the feedback voltage of the display panel by first resistor and is connected, institute
The output end for stating differential amplifier exports compensated Vcom voltage；Gain adjusting unit, the first of the gain adjusting unit
End is connected with the negative input end of the differential amplifier, the second end ground connection of the gain adjusting unit, the gain adjustment list
The third end of member is connected with the output end of the differential amplifier, and the control terminal of the gain adjusting unit receives control signal,
The gain adjusting unit is used for the gain of the differential amplifier according to the control signal adjust automatically；Control unit, institute
It states control unit to be connected with the control terminal of the gain adjusting unit, described control unit is used to be provided according to the supply voltage
It holds the Vcom voltage provided and the feedback voltage to provide the Vfeed voltage that end provides and generates the control signal, and will be described
Control signal is exported to the gain adjusting unit.
The Vcom voltage compensation circuit of the display panel of the embodiment of the present invention, by control unit according to supply voltage Vcom
Control signal is exported with feedback voltage V feed, by gain adjusting unit according to the control signal adjust automatically differential amplifier
Gain, and then realize Vcom voltage compensation multiple adjustment.Can not only realize as a result, differential amplifier common mode inhibition,
Differential amplification, additionally it is possible to realize the adjust automatically of Vcom voltage compensation multiple, and circuit structure is simple, help to reduce electricity
The layout area of road plate reduces economic cost.
According to one embodiment of present invention, the gain adjusting unit includes: second resistance, and the one of the second resistance
End is connected with the negative input end of the differential amplifier；Controlled tr tube, the first end of the controlled tr tube and described second
The other end of resistance is connected, and the control electrode of the controlled tr tube receives the control signal；3rd resistor, the 3rd resistor
One end be connected with the second end of the controlled tr tube, the other end of 3rd resistor ground connection；4th resistance, the described 4th
One end of resistance is connected with the first end of the other end of the second resistance and the controlled tr tube respectively, the 4th resistance
The other end be connected with the output end of the differential amplifier.
According to one embodiment of present invention, the controlled tr tube is N-channel junction field effect transistor.
According to one embodiment of present invention, the gain adjusting unit further includes the 5th resistance, and the 5th resistance connects
It connects between the grid and source electrode of the N-channel junction field effect transistor.
According to one embodiment of present invention, the gain adjusting unit further includes diode, the anode of the diode
It is connected with the control electrode of the controlled tr tube, control terminal of the cathode of the diode as the gain adjusting unit.
According to one embodiment of present invention, described control unit includes comparison circuit, the comparison circuit for pair
The absolute value of voltage difference between Vcom voltage and Vfeed voltage is compared with pre-determined threshold voltage, described control unit
The control signal is exported according to the comparison result of the comparison circuit.
According to one embodiment of present invention, when the absolute value of the voltage difference is less than the pre-determined threshold voltage,
Described control unit exports negative level and controls signal, and the gain of the differential amplifier is smaller；It is absolute when the voltage difference
When value is greater than the pre-determined threshold voltage, described control unit exports zero level and controls signal, the gain of the differential amplifier
It is larger.
In order to achieve the above objectives, second aspect of the present invention embodiment proposes a kind of display panel comprising above-mentioned is aobvious
Show the Vcom voltage compensation circuit of panel.
The display panel of the embodiment of the present invention can not only realize differential amplification by above-mentioned Vcom voltage compensation circuit
The common mode inhibition of device, differential amplification, additionally it is possible to realize the adjust automatically of Vcom voltage compensating gain, and Vcom voltage compensates
Circuit structure is simple, facilitates the layout area for reducing circuit board, reduces economic cost.
Further, third aspect present invention embodiment proposes a kind of liquid crystal display comprising above-mentioned display surface
Plate.
The liquid crystal display of the embodiment of the present invention can not only by the Vcom voltage compensation circuit in above-mentioned display panel
The enough common mode inhibition of realization differential amplifier, differential amplification, additionally it is possible to realize the adjust automatically of Vcom voltage compensating gain,
And Vcom voltage compensation circuit structure is simple, facilitates the layout area for reducing LCD circuit plate, reduces economic cost.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is the circuit structure diagram of the Vcom voltage compensation circuit of display panel according to an embodiment of the present invention；
Fig. 2 is the circuit diagram of the Vcom voltage compensation circuit of display panel according to an embodiment of the invention；And
Fig. 3 is the circuit diagram of the Vcom voltage compensation circuit of the display panel of a specific example according to the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings Vcom voltage compensation circuit, the display of the display panel proposed according to embodiments of the present invention are described
Panel and liquid crystal display.
Fig. 1 is the structure chart of the Vcom voltage compensation circuit of display panel according to an embodiment of the present invention.As shown in Figure 1,
The Vcom voltage compensation circuit of the display panel, comprising: differential amplifier 10, first resistor R1, gain adjusting unit 20 and control
Unit 30 processed.
Wherein, the positive input terminal of differential amplifier 10 provides end with the supply voltage Vcom of display panel and is connected, differential to put
The negative input end of big device 10 provides end with the feedback voltage V feed of display panel by first resistor R1 and is connected, differential amplifier
10 output end exports compensated Vcom voltage.The first end of gain adjusting unit 20 and the negative input end of differential amplifier 10
It is connected, the second end of gain adjusting unit 20 is grounded, the third end of gain adjusting unit 20 and the output end of differential amplifier 10
It is connected, the control terminal of gain adjusting unit 20 receives control signal, and gain adjusting unit 20 is used to be adjusted automatically according to control signal
The gain of whole differential amplifier 10.Control unit 30 is connected with the control terminal of gain adjusting unit 20, and control unit 30 is used for root
The Vcom voltage that end provides is provided according to supply voltage and the Vfeed voltage that feedback voltage offer end provides generates control signal, and
Control signal is exported to gain adjusting unit 20.
Specifically, control unit 30 provides the Vcom voltage and feedback voltage offer end offer that end provides according to supply voltage
Vfeed voltage generate control signal, and control signal is exported to gain adjusting unit 20, and then gain adjusting unit 20 can
With according to control signal adjust automatically differential amplifier 10 feedback resistance or input circuit damping resistance, it is differential with adjust automatically
The gain (i.e. the compensation multiple of Vcom voltage) of amplifier 10.The compensation circuit not only has common mode inhibition, differential amplification as a result,
Function, additionally it is possible to realize the adjust automatically of Vcom voltage compensation multiple, and structure is simple, help to reduce circuit-board laying-out face
Product reduces economic cost.
In one embodiment of the invention, as shown in Fig. 2, gain adjusting unit 20 includes: second resistance R2, controllably opens
Close pipe V, 3rd resistor R3 and the 4th resistance R4.
Wherein, one end of second resistance R2 is connected with the negative input end of differential amplifier 10；The first end of controlled tr tube V
It is connected with the other end of second resistance R2, the control electrode of controlled tr tube V receives control signal；One end of 3rd resistor R3 with can
The second end for controlling switching tube V is connected, the other end ground connection of 3rd resistor R3；One end of 4th resistance R4 respectively with second resistance R2
The other end be connected with the first end of controlled tr tube V, the output end phase of the other end and differential amplifier 10 of the 4th resistance R4
Even.
Optionally, controlled tr tube V can be N-channel junction field effect transistor.
Further, as shown in Fig. 2, gain adjusting unit 20 can also include the 5th resistance R5.Wherein, the 5th resistance R5
It is connected between the grid and source electrode of N-channel junction field effect transistor, to provide bias voltage for field effect transistor V, and rises
The effect of bleed off resistance is to protect field effect transistor V.
Specifically, as shown in Fig. 2, when differential amplifier positive input terminal is grounded, when the reversed feedthrough voltage Vfeed of negative input end,
There is following formula (1) establishment:
Wherein, Rx=R3+r, r are the source and drain resistance of field effect transistor V.
It enablesWhen 10 negative input end of differential amplifier is grounded, positive input terminates supply voltage
When Vcom, there is following formula (2) establishment:
Vout=(1+K) Vcom (2)
It can be obtained according to formula (1) and (2), the offset voltage Vcomout=Vcom+K for the Vcom that differential amplifier 10 exports
(Vcom-Vfeed)。
In one embodiment of the invention, as shown in figure 3, gain adjusting unit 20 can be with diode D.Wherein, two
The anode of pole pipe D is connected with the control electrode of controlled tr tube V, control terminal of the cathode of diode D as gain adjusting unit 20.
Further, as shown in figure 3, control unit 30 may include comparison circuit 31, comparison circuit 31 is used for Vcom
The absolute value and pre-determined threshold voltage V of voltage difference between voltage and Vfeed voltageThresholdingIt is compared, 30 basis of control unit
The comparison result output control signal of comparison circuit 31.
Specifically, when the absolute value of voltage difference is less than pre-determined threshold voltage VThresholdingWhen, control unit 30 exports negative level control
The gain of signal processed, differential amplifier 10 is smaller；When the absolute value of voltage difference is greater than pre-determined threshold voltage VThresholdingWhen, control is single
Member output zero level controls signal, and the gain of differential amplifier 10 is larger.
Specifically, as shown in figure 3, the absolute value when voltage difference is less than pre-determined threshold voltage VThresholding, i.e., | Vfeed-
Vcom | < VThresholdingWhen, control unit 30 exports negative level and controls signal, diode D conducting, field effect transistor V cut-off, source and drain
Resistance r → ∞ (i.e. source and drain resistance r is intended to infinity), the gain of differential amplifier 10 is smaller, i.e. the compensation of Vcom voltage times
Number is smaller.
When the absolute value of voltage difference is greater than pre-determined threshold voltage VThresholding, i.e., | Vfeed-Vcom | > VThresholdingWhen, control unit 30
It exports zero level and controls signal, diode D is not turned on, and field effect transistor V conducting, (i.e. source and drain resistance r becomes for source and drain resistance r → 0
To in 0), the gain of differential amplifier 10 is larger, i.e. the compensation multiple of Vcom voltage is larger.
It should be noted that the absolute value when voltage difference is equal to pre-determined threshold voltage VThresholding, i.e., | Vfeed-Vcom |=
VThresholdingWhen, control unit 30 can according to need output negative level control signal or zero level control signal, to adjust Vcom voltage
Compensation multiple, herein without limitation.
To sum up, the Vcom voltage compensation circuit of the display panel of the embodiment of the present invention, passes through supply voltage Vcom and feedback
Voltage Vfeed output control signal, controls the turn-on and turn-off of field effect transistor V, according to the control signal to realize source and drain
The adjusting of resistance r, and then pass through the feedback resistance or input circuit damping resistance of source and drain resistance r adjust automatically differential amplifier,
And finally realize the adjusting of differential amplifer gain (i.e. Vcom voltage compensation multiple).Differential amplification can not only be realized as a result,
The common mode inhibition of device, differential amplification, additionally it is possible to realize the adjust automatically of Vcom voltage compensation multiple, and circuit structure letter
Single, used electronic component is less, facilitates the layout area for reducing circuit board, reduces economic cost.
Further, the invention proposes a kind of display panels comprising the display panel of the above embodiment of the present invention
Vcom voltage compensation circuit.
The display panel of the embodiment of the present invention can not only realize differential amplification by above-mentioned Vcom voltage compensation circuit
The common mode inhibition of device, differential amplification, additionally it is possible to realize the adjust automatically of Vcom voltage compensation multiple, and Vcom voltage compensates
Circuit structure is simple, and used electronic component is less, facilitates the layout area for reducing circuit board, reduces economic cost.
Further, the invention proposes a kind of liquid crystal displays comprising the display surface of the above embodiment of the present invention
Plate.
The liquid crystal display of the embodiment of the present invention can not only by the Vcom voltage compensation circuit in above-mentioned display panel
The enough common mode inhibition of realization differential amplifier, differential amplification, additionally it is possible to realize the adjust automatically of Vcom voltage compensation multiple,
And Vcom voltage compensation circuit structure is simple, used electronic component is less, helps to reduce LCD circuit plate
Layout area, reduce economic cost.
In addition, other compositions of liquid crystal display according to an embodiment of the present invention and effect are to the ordinary skill people of this field
Member for be all it is known, in order to reduce redundancy, be not repeated herein.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.In the description of the present invention, " multiple "
It is meant that at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (9)
1. a kind of Vcom voltage compensation circuit of display panel characterized by comprising
Differential amplifier, the positive input terminal of the differential amplifier provide end with the supply voltage of the display panel and are connected, institute
The negative input end for stating differential amplifier provides end with the feedback voltage of the display panel by first resistor and is connected, described differential
The output end of amplifier exports compensated Vcom voltage；
Gain adjusting unit, the first end of the gain adjusting unit is connected with the negative input end of the differential amplifier, described
The second end of gain adjusting unit is grounded, the third end of the gain adjusting unit and the output end phase of the differential amplifier
Even, the control terminal of the gain adjusting unit receives control signal, and the gain adjusting unit is used for according to the control signal
The gain of differential amplifier described in adjust automatically；
Control unit, described control unit are connected with the control terminal of the gain adjusting unit, and described control unit is used for basis
The supply voltage provides the Vcom voltage that end provides and the feedback voltage provides the Vfeed voltage that end provides and generates the control
Signal processed, and the control signal is exported to the gain adjusting unit.
2. the Vcom voltage compensation circuit of display panel as described in claim 1, which is characterized in that the gain adjusting unit
Include:
Second resistance, one end of the second resistance are connected with the negative input end of the differential amplifier；
Controlled tr tube, the first end of the controlled tr tube are connected with the other end of the second resistance, the controllable switch
The control electrode of pipe receives the control signal；
3rd resistor, one end of the 3rd resistor are connected with the second end of the controlled tr tube, the 3rd resistor it is another
One end ground connection；
4th resistance, one end of the 4th resistance respectively with the other end of the second resistance and the controlled tr tube
One end is connected, and the other end of the 4th resistance is connected with the output end of the differential amplifier.
3. the Vcom voltage compensation circuit of display panel as claimed in claim 2, which is characterized in that the controlled tr tube is
N-channel junction field effect transistor.
4. the Vcom voltage compensation circuit of display panel as claimed in claim 3, which is characterized in that the gain adjusting unit
It further include the 5th resistance, the 5th resistance is connected between the grid and source electrode of the N-channel junction field effect transistor.
5. the Vcom voltage compensation circuit of the display panel as described in any one of claim 2-4, which is characterized in that the increasing
Beneficial adjustment unit further includes diode, and the anode of the diode is connected with the control electrode of the controlled tr tube, two pole
Control terminal of the cathode of pipe as the gain adjusting unit.
6. the Vcom voltage compensation circuit of display panel as claimed in claim 5, which is characterized in that described control unit includes
Comparison circuit, the comparison circuit are used for absolute value and pre- gating to the voltage difference between Vcom voltage and Vfeed voltage
Voltage limit is compared, and described control unit exports the control signal according to the comparison result of the comparison circuit.
7. the Vcom voltage compensation circuit of display panel as claimed in claim 6, which is characterized in that
When the absolute value of the voltage difference is less than the pre-determined threshold voltage, described control unit exports negative level control letter
Number, the gain of the differential amplifier is smaller；
When the absolute value of the voltage difference is greater than the pre-determined threshold voltage, described control unit exports zero level control letter
Number, the gain of the differential amplifier is larger.
8. a kind of display panel, which is characterized in that the Vcom electricity including display panel such as of any of claims 1-7
Press compensation circuit.
9. a kind of liquid crystal display, which is characterized in that including display panel as claimed in claim 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710100357.0A CN107045860B (en) | 2017-02-23 | 2017-02-23 | Liquid crystal display, display panel and its Vcom voltage compensation circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710100357.0A CN107045860B (en) | 2017-02-23 | 2017-02-23 | Liquid crystal display, display panel and its Vcom voltage compensation circuit |
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| CN107045860B true CN107045860B (en) | 2019-08-02 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107045860B (en) * | 2017-02-23 | 2019-08-02 | 京东方科技集团股份有限公司 | Liquid crystal display, display panel and its Vcom voltage compensation circuit |
| CN108665841B (en) * | 2018-05-09 | 2021-09-14 | 京东方科技集团股份有限公司 | Common electrode voltage compensation circuit and display device |
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