CN107492358A - A kind of generation circuit and its production method of Gamma reference voltages - Google Patents
A kind of generation circuit and its production method of Gamma reference voltages Download PDFInfo
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- CN107492358A CN107492358A CN201710831880.0A CN201710831880A CN107492358A CN 107492358 A CN107492358 A CN 107492358A CN 201710831880 A CN201710831880 A CN 201710831880A CN 107492358 A CN107492358 A CN 107492358A
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- 230000003321 amplification Effects 0.000 claims description 17
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 11
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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
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The embodiment of the invention discloses a kind of generation circuit and its production method of Gamma reference voltages, the circuit includes：Bleeder circuit and adjustment circuit, bleeder circuit, including：N number of voltage output end, for exporting Gamma reference voltages from each voltage output end；The input of adjustment circuit is connected with m-th of voltage output end, output end is connected when meeting preparatory condition with n-th of voltage output end, for the Gamma reference voltages exported according to m-th of voltage output end, adjust the Gamma reference voltages that Gamma reference voltages to the n-th voltage output end of n-th of voltage output end output exports, technical scheme is by setting adjustment circuit, can be in the driving force deficiency of bleeder circuit, strengthen its driving force, to eliminate the technical problem that the display of liquid crystal display is abnormal caused by the driving force deficiency of the generation circuit of existing Gamma reference voltages.
Description
Technical field
The present embodiments relate to display technology field, and in particular to a kind of generation circuit of Gamma reference voltages and its
Production method.
Background technology
There are multiple pixel cells, each pixel cell has red on the display panel of Thin Film Transistor-LCD
The sub-pix of color, green and blue three kinds of different colours.Determined during the brightness that each sub-pix is presented by Gamma reference voltages
Fixed.
The effect of the generation circuit of Gamma reference voltages is the gamma curve according to required by liquid crystal display, to set
Gamma reference voltage, the reference voltage shown as thin film transistor (TFT) progress gray scale.Each Gamma reference voltages are inputted
Into the source electrode driver of thin film transistor (TFT), by the digital analog converter in source electrode driver, all grayscale voltages are produced.
Study and find through inventor, the driving force deficiency of the generation circuit of existing Gamma reference voltages, so as to cause
The display of liquid crystal display is abnormal.
The content of the invention
In order to solve the above-mentioned technical problem, the embodiments of the invention provide a kind of generation circuit of Gamma reference voltages and
Its production method, to solve the liquid crystal caused by the driving force deficiency of the generation circuit of existing Gamma reference voltages
The display of display is abnormal.
In one aspect, the embodiments of the invention provide a kind of generation circuit of Gamma reference voltages, including：Partial pressure electricity
Road and adjustment circuit；
The bleeder circuit, including：N number of voltage output end, for electric from the output Gamma references of each voltage output end
Pressure；Wherein, N >=1；
The input of the adjustment circuit is connected with m-th of voltage output end, and output end is when meeting preparatory condition with n-th
Individual voltage output end connection, for the Gamma reference voltages exported according to m-th of voltage output end, adjusts n-th of voltage output
The Gamma reference voltages that Gamma reference voltages to the n-th voltage output end of end output exports；Wherein, 1≤m, n≤N, n≤
m。
Alternatively, the adjustment circuit includes：Current output module and output control module；
The current output module, for output current；
The output control module, it is connected with m-th of voltage output end, for what is exported according to m-th of voltage output end
Whether Gamma reference voltages, control electric current output module are defeated to adjust n-th of voltage to n-th of voltage output end output current
Go out the Gamma reference voltages that Gamma reference voltages to the n-th voltage output end of end output exports.
Alternatively, the current output module includes：Adjustment unit and amplifying unit；
The adjustment unit, respectively the input with signal input part and the amplifying unit be connected, for adjusting signal
The signal of input output；
The amplifying unit, is connected with signal input part, for the signal after adjustment to be amplified, output current.
Alternatively, the adjustment unit includes：First variable resistor；
The amplifying unit, including：Current amplifier, the first load resistance and the second load resistance, the Current amplifier
The first end of device is connected with the first variable resistor, and the second end is connected by the first load resistance with signal input part, and the 3rd end leads to
Cross the second load resistance ground connection.
Alternatively, the output control module, including：Control unit and switch element；
Described control unit, it is connected with m-th of voltage output end, for gathering and amplifying m-th of voltage output end output
Gamma reference voltages, judge whether the Gamma reference voltages after amplification consistent with predeterminated voltage, Gamma after amplification ginseng
Examine voltage and predeterminated voltage it is inconsistent in the state of, export high level signal；
The switch element, for after the high level signal is received, in opening, so that electric current exports mould
Block is to n-th of voltage output end output current.
Alternatively, described control unit, including：Reference voltage collecting unit, predeterminated voltage generation unit and judging unit；
The reference voltage collecting unit, is connected with m-th of voltage output end, defeated for gathering and amplifying m-th of voltage
Go out the Gamma reference voltages of end output；
The predeterminated voltage generation unit, is connected with power end, for adjusting the signal of the power end, generates default electricity
Pressure；
The judging unit, for judging whether the Gamma reference voltages after amplifying and predeterminated voltage are consistent, after amplification
Gamma reference voltages and predeterminated voltage it is inconsistent in the state of, export high level signal.
Alternatively, the judging unit includes：NAND gate；
The reference voltage collecting unit includes：Voltage amplifier, the 3rd load resistance and the 4th load resistance；The electricity
The input of pressure amplifier is connected with m-th of voltage output end, and output end is connected with the first input end of the NAND gate；
The predeterminated voltage generation unit, including：The second adjustable resistance and the 5th load resistance；Described second can power transformation
Resistance, the second input with power end and the NAND gate is connected respectively.
Alternatively, the switch element, including switching transistor, the grid of the switching transistor and the NAND gate
Output end is connected, and the three-terminal link of the first pole and current amplifier, the second pole is connected with n-th of voltage output end.
On the other hand, the embodiment of the present invention also provides a kind of production method of Gamma reference voltages, applied to Gamma
In the generation circuit of reference voltage, including：
When each voltage output end of bleeder circuit exports Gamma reference voltages, adjustment circuit is defeated according to m-th of voltage
Go out the Gamma reference voltages of end output, the Gamma reference voltages that n-th of voltage output end of adjustment exports to n-th voltage output
Hold the Gamma reference voltages of output；
Wherein, 1≤m, n≤N, the quantity for the voltage output end that n≤m, N include for bleeder circuit, N >=1.
Alternatively, the Gamma reference voltages that the adjustment circuit exports according to m-th of voltage output end, n-th of electricity is adjusted
The Gamma reference voltages that Gamma reference voltages to the n-th voltage output end of pressure output end output exports, including：
Gather and amplify the Gamma reference voltages of m-th of voltage output end output；
Judge whether Gamma reference voltages and predeterminated voltage after amplification consistent, Gamma reference voltages after amplification and
In the state of predeterminated voltage is inconsistent, high level signal is exported；
After receiving the high level signal, to n-th of voltage output end output current, to adjust n-th of voltage output
The Gamma reference voltages that Gamma reference voltages to the n-th voltage output end of end output exports.
The embodiment of the present invention provides a kind of generation circuit and its production method of Gamma reference voltages, and the circuit includes：Point
Volt circuit and adjustment circuit, bleeder circuit, including：N number of voltage output end, for joining from each voltage output end output Gamma
Examine voltage；The input of adjustment circuit is connected with m-th of voltage output end, and output end is electric with n-th when meeting preparatory condition
Output end connection is pressed, it is defeated for the Gamma reference voltages exported according to m-th of voltage output end, n-th of voltage output end of adjustment
The Gamma reference voltages that the Gamma reference voltages gone out to n-th voltage output end exports, technical scheme is by setting
Adjustment circuit is put, its driving force can be strengthened in the driving force deficiency of bleeder circuit, to eliminate due to existing
The abnormal technical problem of the display of liquid crystal display caused by the driving force deficiency of the generation circuit of Gamma reference voltages.
Certainly, any product or method for implementing the present invention it is not absolutely required to reach all the above excellent simultaneously
Point.Other features and advantages of the present invention will illustrate in subsequent specification embodiment, also, partly implement from specification
Become apparent in example, or understood by implementing the present invention.The purpose of the embodiment of the present invention and other advantages can pass through
Specifically noted structure is realized and obtained in specification, claims and accompanying drawing.
Brief description of the drawings
Accompanying drawing is used for providing further understanding technical solution of the present invention, and a part for constitution instruction, with this
The embodiment of application is used to explain technical scheme together, does not form the limitation to technical solution of the present invention.
Fig. 1 is the equivalent circuit diagram of the generation circuit of existing Gamma reference voltages；
Fig. 2 is a structural representation of the generation circuit of Gamma reference voltages provided in an embodiment of the present invention；
Fig. 3 is another structural representation of the generation circuit of Gamma reference voltages provided in an embodiment of the present invention；
Fig. 4 is the equivalent circuit diagram of the generation circuit of Gamma reference voltages provided in an embodiment of the present invention；
Fig. 5 is the flow chart of the production method of Gamma reference voltages provided in an embodiment of the present invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with accompanying drawing to the present invention
Embodiment be described in detail.It should be noted that in the case where not conflicting, in the embodiment and embodiment in the application
Feature can mutually be combined.
Unless otherwise defined, the embodiment of the present invention discloses the technical term used or scientific terminology should be institute of the present invention
The ordinary meaning that the personage with general technical ability is understood in category field." first ", " second " used in the embodiment of the present invention
And similar word is not offered as any order, quantity or importance, and it is used only to distinguish different parts.
The element or flase drop that the similar word such as " comprising " or "comprising" goes out before the word always, which are covered, appears in the word presented hereinafter
Element or object and its equivalent, and be not excluded for other elements or flase drop.The similar word such as " connection " or " connected "
Physics or mechanical connection is not limited to, but electrical connection can be included, either hi is directly or indirect
's." on ", " under ", "left", "right" etc. are only used for representing relative position relation, when the absolute position for the object being described changes
Afterwards, then the relative position relation may also correspondingly change.
Fig. 1 is the equivalent circuit diagram of the generation circuit of existing Gamma reference voltages, as shown in figure 1, existing Gamma
The generation circuit of reference voltage is resistor voltage divider circuit, specifically, being produced by analog voltage AVDD through electric resistance partial pressure from 0V-AVDD
Between one group of voltage, as Gamma reference voltages.The generative circuit of Gamma reference voltages includes：Analog voltage AVDD, N+1
Individual resistance and N number of voltage output end, each voltage output end exports a Gamma reference voltage, therefore, caused by the circuit
Gamma reference voltages have N number of, i.e. GMA1-GMAN.
Wherein, analog voltage AVDD is typically at 12 volts or so.
Study and find through inventor, the driving force of the generation circuit of the Gamma reference voltages in liquid crystal display is all very
It is weak, when the generation circuit load of Gamma reference voltages is excessive, caused Gamma reference voltages can be caused smaller so that pixel
The brightness in region is inadequate, and liquid crystal display can not show the picture that show, causes the display of liquid crystal display abnormal.
In order to solve the above-mentioned technical problem, the embodiments of the invention provide a kind of generation circuit of Gamma reference voltages and
Its production method.
Embodiment one
Fig. 2 be Gamma reference voltages provided in an embodiment of the present invention generation circuit a structural representation, such as Fig. 2
It is shown, the generation circuit of Gamma reference voltages provided in an embodiment of the present invention, including：Bleeder circuit 10 and adjustment circuit 20.
Specifically, bleeder circuit 10, including：N number of voltage output end, for joining from each voltage output end output Gamma
Examine voltage.
As shown in Fig. 2 N number of voltage output end is C1-CN, Gamma reference voltages corresponding to output are GMA1- respectively
GMAN。
Wherein, N >=1.It is to be understood that the bleeder circuit provided in the present embodiment is resistor voltage divider circuit, wherein, often
The resistance size of individual resistance can select according to the value size of each Gamma reference voltages required for liquid crystal display.
Specifically, the input of adjustment circuit 20 is connected with m-th of voltage output end Cm, output end is meeting preparatory condition
When be connected with n-th of voltage output end Cn, for the Gamma reference voltages exported according to m-th voltage output end Cm, adjustment the
The Gamma reference voltages that the Gamma reference voltages of n voltage output end Cn outputs export to n-th voltage output end CN.
Wherein, 1≤m, n≤N, n≤m.
It should be noted that the preparatory condition in the present embodiment, which can refer to, detects m-th of voltage output output end output
Gamma reference voltages it is smaller, can not normal display pixel unit brightness.
Alternatively, the quantity of adjustment circuit 20 can be one, or it is multiple, with specific reference to the demand of bleeder circuit
It is determined that the present invention is not limited in any way to this.It should be noted that Fig. 2 is with an adjustment circuit, and said exemplified by m=N
Bright, the present invention does not limit m, n specific value.
The generation circuit of Gamma reference voltages provided in an embodiment of the present invention, including：Bleeder circuit and adjustment circuit, point
Volt circuit, including：N number of voltage output end, for exporting Gamma reference voltages from each voltage output end；Adjustment circuit it is defeated
Enter end to be connected with m-th of voltage output end, output end is connected when meeting preparatory condition with n-th of voltage output end, for root
According to the Gamma reference voltages of m-th of voltage output end output, the Gamma reference voltages of n-th of voltage output end output are adjusted extremely
The Gamma reference voltages of n-th voltage output end output, technical scheme can divided by setting adjustment circuit
During the driving force deficiency of volt circuit, strengthen its driving force, to eliminate due to the generation circuit of existing Gamma reference voltages
Driving force deficiency caused by liquid crystal display the abnormal technical problem of display.
Alternatively, Fig. 3 is another structural representation of the generation circuit of Gamma reference voltages provided in an embodiment of the present invention
Figure, as shown in figure 3, adjustment circuit 20 includes：Current output module 30 and output control module 40.
Current output module 30, for output current.
Output control module 40, it is connected with m-th of voltage output end Cm, for being exported according to m-th of voltage output end Cm
Gamma reference voltages, whether control electric current output module 30 to n-th of voltage output end Cn output current, to adjust n-th
The Gamma reference voltages that the Gamma reference voltages of voltage output end Cn outputs export to n-th voltage output end CN.
Alternatively, current output module 30 includes：Adjustment unit 31 and amplifying unit 32.
Adjustment unit 31, respectively the input with signal input part Vin and amplifying unit 32 be connected, it is defeated for adjusting signal
The signal for entering to hold Vin to export.
Amplifying unit 32, it is connected with signal input part Vin, for the signal after adjustment to be amplified, output current.
Alternatively, output control module 40, including：Control unit 41 and switch element 42.
Control unit 41, it is connected with m-th of voltage output end, for gathering and amplifying m-th of voltage output end output
Gamma reference voltages, judge whether the Gamma reference voltages after amplification are consistent with predeterminated voltage, Gamma references after amplification
In the state of voltage and predeterminated voltage are inconsistent, high level signal is exported.
Switch element 42, for after high level signal is received, in opening so that current output module 30 to
N-th of voltage output end output current.
Alternatively, control unit 41, including：Reference voltage collecting unit 411, predeterminated voltage generation unit 412 and judgement
Unit 413.
Reference voltage collecting unit 411, it is connected with m-th of voltage output end Cm, it is defeated for gathering and amplifying m-th of voltage
The Gamma reference voltages for going out to hold Cm to export.
It is to be understood that m can be any integer more than or equal to 1, and less than or equal to N, Fig. 3 is entered by taking m=N as an example
Row explanation, the present invention does not limit m specific value.
Predeterminated voltage generation unit 412, it is connected with power end VGH, for adjusting power end VGH signal, generation is default
Voltage.
Judging unit 413, for judging whether the Gamma reference voltages after amplifying and predeterminated voltage are consistent, after amplification
Gamma reference voltages and predeterminated voltage it is inconsistent in the state of, export high level signal.
It should be noted that if desired judging unit 413 exports high level signal always, ensure the Gamma ginsengs after amplification
The value that voltage is inconsistent all the time with predeterminated voltage, then predeterminated voltage can be made to be unable to reach for the Gamma reference voltages after amplification is examined,
If conversely, not needing judging unit 413 to export high level signal always, then it can make predeterminated voltage for the Gamma ginsengs after amplification
Examine voltage.
Fig. 4 is the equivalent circuit diagram of the generation circuit of Gamma reference voltages provided in an embodiment of the present invention, specific in Fig. 4
Show adjustment unit, amplifying unit, judging unit, reference voltage collecting unit, predeterminated voltage generation unit and switch element
Example arrangement.Skilled addressee readily understands that it is the implementation not limited to this of above each unit, as long as can be real
Its existing respective function.
Alternatively, adjustment unit includes：First variable resistor Rb1.
Alternatively, amplifying unit, including：Current amplifier T1, the first load resistance R1 and the second load resistance R2, electric current
Amplifier T1 first end is connected with the first variable resistor Rb1, and the second end passes through the first load resistance R1 and signal input part Vin
Connection, the 3rd end is grounded by the second load resistance R2.
Alternatively, current amplifier T1 can be triode.
Alternatively, judging unit includes：NAND gate Q2.
Alternatively, reference voltage collecting unit includes：Voltage amplifier Q1, the 3rd load resistance R3 and the 4th load resistance
R4；Voltage amplifier Q1 input is connected with m-th of voltage output end Cm, and output end and NAND gate Q2 first input end connect
Connect.
Specifically, the 3rd load resistance R3 first end is connected with the 4th load resistance R4 the second end, the second end with
NOT gate Q2 first input end connection, the 4th load resistance R4 first end ground connection, the second end and voltage amplifier Q1 input
End connection.It is to be understood that Fig. 4 illustrates by taking m=N as an example, the present invention is not limited thereto.
Predeterminated voltage generation unit, including：The second adjustable resistance Rb2 and the 5th load resistance R5；The second adjustable resistance
Rb2, it is connected respectively with power end VGH and by the 5th load resistance R5 with NAND gate Q2 the second input.
Specifically, one end ground connection adjacent with the second adjustable resistance Rb2 the 5th load resistance R5.
Alternatively, switch element, including：Switching transistor T2, switching transistor T2 grid and NAND gate Q2 output
End connection, the first pole and current amplifier T1 three-terminal link, the second pole is connected with n-th of voltage output end Cn.
The operation principle of the generation circuit of Gamma reference voltages is further specifically described with reference to Fig. 4.Using m=N as
Example illustrates, and is illustrated exemplified by n=N-1.
Operation principle is specially：The Gamma reference voltages that n-th voltage output end exports are amplified to by voltage amplifier Q1
First voltage V1, and the second adjustable resistance Rb2 is adjusted, predeterminated voltage V2 is generated, NAND gate Q2 judges first voltage V1 and second
Whether voltage V2 is consistent, and in the state of first voltage V1 and second voltage V2 are inconsistent, NAND gate Q2 output end output is high
Level signal, switching transistor T2 is opened, make the electric current stream exported after the first variable resistor Rb1 and current amplifier T1 processing
Enter the N-1 voltage output end, so that Gamma reference voltages and n-th voltage that the N-1 voltage output end exports are defeated
The Gamma reference voltages enhancing for going out end output becomes big, when the Gamma reference voltages enhancing of n-th voltage output end output becomes big
Afterwards, the Gamma reference voltages of the n-th voltage output end output after voltage amplifier amplifies are just consistent with predeterminated voltage, this
When, NAND gate Q2 output low level signals, switching transistor T2 ends, defeated through the first variable resistor Rb1 and current amplifier T1
The electric current gone out is no longer flow into the N-1 voltage output end.
It is it should be noted that always on to switching transistor T2, it is necessary to ensure first voltage V1 and predeterminated voltage V2
Keep inconsistent, now, predeterminated voltage V2 can will be adjusted to what first voltage V1 was unable to reach using the second adjustable resistance Rb2
Magnitude of voltage.That is V2 can be the magnitude of voltage of analog voltage AVDD outputs.
Embodiment two
Inventive concept based on above-described embodiment, the embodiment of the present invention also provide a kind of generation side of Gamma reference voltages
Method, in the generation circuit applied to the Gamma reference voltages of embodiment one, including：
When each voltage output end of bleeder circuit exports Gamma reference voltages, adjustment circuit is defeated according to m-th of voltage
Go out the Gamma reference voltages of end output, the Gamma reference voltages that n-th of voltage output end of adjustment exports to n-th voltage output
Hold the Gamma reference voltages of output.
Wherein, the quantity for the voltage output end that 1≤m, n≤N, n≤m N include for bleeder circuit, N >=1.
Specifically, Fig. 5 is the flow chart of the production method of Gamma reference voltages provided in an embodiment of the present invention, such as Fig. 5 institutes
Show, the Gamma reference voltages exported according to m-th of voltage output end, adjust the Gamma references of n-th of voltage output end output
The Gamma reference voltages that voltage to n-th voltage output end exports, specifically include following steps：
Step 100, the Gamma reference voltages for gathering and amplifying m-th of voltage output end output.
Step 200, judge whether the Gamma reference voltages after amplifying and predeterminated voltage are consistent, Gamma ginsengs after amplification
Examine voltage and predeterminated voltage it is inconsistent in the state of, export high level signal.
Step 300, after receiving high level signal, to n-th of voltage output end output current, to adjust n-th of voltage
The Gamma reference voltages that Gamma reference voltages to the n-th voltage output end of output end output exports.
The production method of Gamma reference voltages provided in an embodiment of the present invention, including：It is defeated in each voltage of bleeder circuit
When going out end output Gamma reference voltages, adjustment circuit adjusts the Gamma reference voltages of n-th voltage output end output to n-th
The Gamma reference voltages of voltage output end output, technical scheme, can be in bleeder circuit by setting adjustment circuit
Driving force deficiency when, strengthen its driving force, with eliminate due to existing Gamma reference voltages generation circuit driving
The abnormal technical problem of the display of liquid crystal display caused by scarce capacity.
Have it is following some need to illustrate：
Accompanying drawing of the embodiment of the present invention pertain only to the present embodiments relate to structure, other structures refer to generally set
Meter.
In the case where not conflicting, it is new to obtain that embodiments of the invention are that the feature in embodiment can be mutually combined
Embodiment.
Although disclosed herein embodiment as above, content be only readily appreciate the present invention and use implementation
Mode, it is not limited to the present invention.Technical staff in any art of the present invention, do not depart from disclosed herein
On the premise of spirit and scope, any modification and change can be carried out in the form and details of implementation, but the present invention's is special
Sharp protection domain, still should be subject to the scope of the claims as defined in the appended claims.
Claims (10)
- A kind of 1. generation circuit of Gamma reference voltages, it is characterised in that including：Bleeder circuit and adjustment circuit；The bleeder circuit, including：N number of voltage output end, for exporting Gamma reference voltages from each voltage output end；Its In, N >=1；The input of the adjustment circuit is connected with m-th of voltage output end, and output end is electric with n-th when meeting preparatory condition Output end connection is pressed, it is defeated for the Gamma reference voltages exported according to m-th of voltage output end, n-th of voltage output end of adjustment The Gamma reference voltages that the Gamma reference voltages gone out to n-th voltage output end exports；Wherein, 1≤m, n≤N, n≤m.
- 2. the generation circuit of Gamma reference voltages according to claim 1, it is characterised in that the adjustment circuit includes： Current output module and output control module；The current output module, for output current；The output control module, it is connected with m-th of voltage output end, for the Gamma exported according to m-th of voltage output end Reference voltage, whether control electric current output module is to n-th of voltage output end output current, to adjust n-th of voltage output end The Gamma reference voltages that the Gamma reference voltages of output to n-th voltage output end exports.
- 3. the generation circuit of Gamma reference voltages according to claim 2, it is characterised in that the current output module Including：Adjustment unit and amplifying unit；The adjustment unit, respectively the input with signal input part and the amplifying unit be connected, for adjust signal input Hold the signal of output；The amplifying unit, is connected with signal input part, for the signal after adjustment to be amplified, output current.
- 4. the generation circuit of Gamma reference voltages according to claim 3, it is characterised in that the adjustment unit includes： First variable resistor；The amplifying unit, including：Current amplifier, the first load resistance and the second load resistance, the current amplifier First end is connected with the first variable resistor, and the second end is connected by the first load resistance with signal input part, and the 3rd end passes through Two load resistances are grounded.
- 5. the generation circuit of Gamma reference voltages according to claim 2, it is characterised in that the output control module, Including：Control unit and switch element；Described control unit, it is connected with m-th of voltage output end, for gathering and amplifying m-th of voltage output end output Gamma reference voltages, judge whether the Gamma reference voltages after amplification are consistent with predeterminated voltage, Gamma references after amplification In the state of voltage and predeterminated voltage are inconsistent, high level signal is exported；The switch element, for after the high level signal is received, in opening so that current output module to N-th of voltage output end output current.
- 6. the generation circuit of Gamma reference voltages according to claim 5, it is characterised in that described control unit, bag Include：Reference voltage collecting unit, predeterminated voltage generation unit and judging unit；The reference voltage collecting unit, is connected with m-th of voltage output end, for gathering and amplifying m-th of voltage output end The Gamma reference voltages of output；The predeterminated voltage generation unit, is connected with power end, for adjusting the signal of the power end, generates predeterminated voltage；The judging unit, for judging whether the Gamma reference voltages after amplifying and predeterminated voltage are consistent, after amplification In the state of Gamma reference voltages and predeterminated voltage are inconsistent, high level signal is exported.
- 7. the generation circuit of Gamma reference voltages according to claim 6, it is characterised in thatThe judging unit includes：NAND gate；The reference voltage collecting unit includes：Voltage amplifier, the 3rd load resistance and the 4th load resistance；The voltage is put The input of big device is connected with m-th of voltage output end, and output end is connected with the first input end of the NAND gate；The predeterminated voltage generation unit, including：The second adjustable resistance and the 5th load resistance；The second adjustable resistance, point The second input not with power end and the NAND gate is connected.
- 8. the generation circuit of Gamma reference voltages according to claim 7, it is characterised in that the switch element, bag Include：Switching transistor, the grid of the switching transistor are connected with the output end of the NAND gate, the first pole and current amplifier Three-terminal link, the second pole is connected with n-th of voltage output end.
- 9. a kind of production method of Gamma reference voltages, it is characterised in that applied to as described in claim 1-8 is any In the generation circuit of Gamma reference voltages, including：When each voltage output end of bleeder circuit exports Gamma reference voltages, exported according to m-th of voltage output end Gamma reference voltages, the Gamma reference voltages that adjustment circuit n-th of voltage output end of adjustment exports to n-th voltage output end The Gamma reference voltages of output；Wherein, 1≤m, n≤N, the quantity for the voltage output end that n≤m, N include for bleeder circuit, N >=1.
- 10. according to the method for claim 9, it is characterised in that the Gamma exported according to m-th of voltage output end Reference voltage, Gamma reference voltages to the n-th voltage output end that adjustment circuit adjusts n-th of voltage output end output export Gamma reference voltages, including：Gather and amplify the Gamma reference voltages of m-th of voltage output end output；Judge whether the Gamma reference voltages after amplification and predeterminated voltage are consistent, Gamma reference voltages after amplification are with presetting In the state of voltage is inconsistent, high level signal is exported；It is defeated to adjust n-th of voltage output end to n-th of voltage output end output current after receiving the high level signal The Gamma reference voltages that the Gamma reference voltages gone out to n-th voltage output end exports.
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| CN107492358B (en) | 2020-02-21 |
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