CN106384579A - Gamma reference voltage generation circuit and liquid crystal display panel - Google Patents
Gamma reference voltage generation circuit and liquid crystal display panel Download PDFInfo
- Publication number
- CN106384579A CN106384579A CN201610796784.2A CN201610796784A CN106384579A CN 106384579 A CN106384579 A CN 106384579A CN 201610796784 A CN201610796784 A CN 201610796784A CN 106384579 A CN106384579 A CN 106384579A
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- Prior art keywords
- gamma reference
- circuit
- reference voltage
- voltage
- switch element
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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
-
- 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
Abstract
The present invention discloses a gamma reference voltage generation circuit and a liquid crystal display panel. The problems are solved that the mode of generating Gamma reference voltage is inconvenient in operation, bad in regulation and big in cost in the prior art. The generation circuit comprises a first power supply, a second power supply and at least one voltage generation subcircuit. The voltage output by a first power supply is higher than the voltage outputted by a second power supply; the voltage generation subcircuit includes a switch element and a controller, wherein the source electrode of the switch element is connected with the output end of the first power supply, and the drain electrode of the switch element is connected with the output end of the second power supply and then is taken as the output end of the voltage generation subcircuit; and the grid of the switch element is connected with the control signal output end of the controller. The controller outputs control signals with different duty ratios to allow the voltage generation subcricuit to generate the Gamma reference voltage associated with the duty ratios. The Gamma reference voltage generation circuit and the liquid crystal display panel are suitable for the liquid crystal display manufacturing field.
Description
Technical field
The present invention relates to liquid crystal display manufactures field, more particularly, to a kind of gamma reference voltage produces circuit, further relates to
There are the display panels that this gamma reference voltage produces circuit.
Background technology
At present, (the Thin Film of the TFT-LCD as main flat faced display in prior art
TransistorLiquid Crystal Display, Thin Film Transistor-LCD) have become as modern IT product and regard
The important display platform of news product.Fig. 1 shows the driving configuration diagram of TFT-LCD in prior art.With reference to Fig. 1, TFT-
The driving principle of LCD is：R/G/B compressed signal, control signal and data clock signal are passed through wire rod and pcb board by system board
Connector (adapter) on 2 is connected, and signal is by time schedule controller (Timing Controller, the letter on pcb board 2
Claim TCON) process after, respectively pass through data-driven module 1 (Source-Chip on Film, abbreviation S-COF) and turntable driving
Module 4 (Gate-Chip on Film, abbreviation G-COF) inputs to the viewing area 3 of display panels.
Specifically, in order to meet driving needs, data-driven module needs to receive multigroup gamma reference voltage (usually 18
Group or 14 groups).In specific implementation process, the multigroup gamma reference voltage receiving is input in data-driven module.Warp
Cross the conversion of the digital to analog converter of data-driven module, multigroup gamma reference voltage will correspondingly produce multiple grayscale voltages.
Different grayscale voltages is used for making the display floater of Thin Film Transistor-LCD to produce different brightness.
Fig. 2 shows and is used in prior art producing the circuit of gamma reference voltage.With reference to Fig. 2, gamma in prior art
The producing method of reference voltage is：First, will be multiple by surface mounting technology (Surface MountTechnology, SMT)
The Chip-R of series connection navigates to the bond pad surface on PCB respectively, and to these series resistance high input voltages, (such as 16V is extremely
18V).Then, multiple Chip-Rs are grouped, so that every group of Chip-R one gamma reference voltage Ur of corresponding output.
Change the gamma reference voltage of output by the resistance changing every group of Chip-R.However, producing gamma ginseng in prior art
The defect examining the mode of voltage is：Operation inconvenience, modulability is poor, and cost is big.
Content of the invention
For be used in above-mentioned prior art producing the operation inconvenience that the mode of gamma reference voltage exists, modulability poor,
The big defect of cost, the present invention proposes a kind of gamma reference voltage and produces circuit and display panels.
According to an aspect of the invention, it is provided a kind of gamma reference voltage produces circuit, including the first power supply, second
Power supply and at least one voltage generation sub-circuit；The voltage of described first power supply output is higher than the electricity of described second source output
Pressure；
Described voltage generation sub-circuit includes switch element and controller, wherein：
The source electrode of described switch element connects the outfan of described first power supply；
As described voltage generation sub-circuit after the outfan of the drain electrode described second source of connection of described switch element
Outfan；
The grid of described switch element connects the control signal outfan of described controller, and described controller is had by output
The control signal of different duty is had to make the Gamma reference that described voltage generation sub-circuit generation is associated with described dutycycle
Voltage.
Preferably, the magnitude of voltage of described first power supply output is more than or equal to what each described voltage generation sub-circuit produced
The maximum of gamma reference voltage.
Preferably, the magnitude of voltage of described second source output is less than or equal to what each described voltage generation sub-circuit produced
The minima of gamma reference voltage.
Preferably, the gamma reference voltage that described voltage generation sub-circuit produces meets：
U=d*UA+ (1-d) * UB
Wherein, U represents gamma reference voltage, and d represents the dutycycle of described control signal, and UA represents that described first power supply is defeated
The magnitude of voltage going out, UB represents the magnitude of voltage of described second source output.
Preferably, described voltage generation sub-circuit also includes resistance, and wherein, described electricity is passed through in the drain electrode of described switch element
Resistance connects the outfan of described second source.
Preferably, described resistance is load resistance.
Preferably, described switch element is mos field effect transistor.
According to another aspect of the present invention, there is provided a kind of display panels, including above-mentioned preferably any one institute
The gamma reference voltage stated produces circuit.
Preferably, described gamma reference voltage produces the first power supply of circuit and second source is respectively positioned on described liquid crystal display
In the drive control plate of panel.
Compared with prior art, in such scheme, there is following following advantage or beneficial effect：
Circuit is produced using gamma reference voltage of the present invention, can solve the problem that the mode producing gamma reference voltage is deposited
The defect inconvenient in operation, modulability is poor, cost is big, makes the brightness side that the display floater of Thin Film Transistor-LCD produces
Just adjustable.
Not only circuit is simple for the present invention, and only needs to input low-voltage, just can produce gamma reference voltage.Therefore, originally
Invention, while cost-effective, has reached the purpose of convenience regulation.
Other features and advantages of the present invention will illustrate in the following description, and partly become from description
It is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by wanting in description, right
Structure specifically noted in book and accompanying drawing is asked to realize and to obtain.
Brief description
Hereinafter will be based on embodiment and refer to the attached drawing is being described in more detail to the present invention.Wherein：
Fig. 1 shows the driving configuration diagram of TFT-LCD in prior art；
Fig. 2 shows and is used in prior art producing the circuit theory schematic diagram of gamma reference voltage；
Fig. 3 shows the principle schematic of gamma reference voltage generation circuit in embodiment one；
Fig. 4 shows the principle schematic of gamma reference voltage generation circuit in embodiment two.
Specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
In the prior art, the operation inconvenience existing for the mode producing gamma reference voltage, modulability are poor, cost is big
Defect.For above-mentioned technological deficiency, the embodiment of the present invention proposes a kind of gamma reference voltage and produces circuit and have this gal
The display panels of horse generating circuit from reference voltage.
Embodiment one：
Fig. 3 shows the principle schematic of gamma reference voltage generation circuit in embodiment one.This gamma reference voltage produces
The data-driven module that raw circuit is used for as display panels provides one or more groups of gamma reference voltages.Gamma reference voltage
Act on the display floater of Thin Film Transistor-LCD, so that display floater produces different brightness.
With reference to Fig. 3, the present embodiment gamma reference voltage produce circuit include the first power supply A, second source B and at least one
Voltage generation sub-circuit 5.In a preferred embodiment, gamma reference voltage produces each the voltage generation sub-circuit in circuit
5 structure is all identical.
Specifically, voltage generation sub-circuit 5 includes switch element M1, M2 ... ..., Mn and controller C1, C2 ... ..., Cn.
Below account for voltage generation sub-circuit is come with the voltage generation sub-circuit 5 including switch element Mn and controller Cn
Preferred structure.
The source electrode of switch element Mn connects the outfan of the first power supply A.The drain electrode of switch element Mn connects second source B's
As the outfan of voltage generation sub-circuit 5 after outfan.
The grid of switch element Mn connects the control signal outfan of controller Cn.Controller Cn has difference by output
The control signal of dutycycle produces the gamma reference voltage that is associated with dutycycle making voltage generation sub-circuit 5.
At least include a voltage generation sub-circuit 5 because gamma reference voltage produces circuit, and each voltage produces son
Circuit 5 is corresponding to produce a gamma reference voltage, and therefore gamma reference voltage produces circuit and at least produces a Gamma reference electricity
Pressure.Gamma reference voltage as shown in Figure 3 produces circuit and can produce n gamma ginseng corresponding to n voltage generation sub-circuit 5 respectively
Examine voltage.
Taking include the voltage generation sub-circuit 5 of switch element Mn and controller Cn as a example the present embodiment gamma to be described below
The operation principle of generating circuit from reference voltage.
In order that forming voltage difference between the first power supply A and second source B, and electric current is allowed to have certain flow direction, this reality
The voltage applying example setting the first power supply A output is higher than the voltage of second source B output.So, electric current can be defeated from the first power supply
Go out end and be flowed into the source electrode of switch element Mn, then flow out and return to second source B through the drain electrode of switch element Mn.
Controller Cn applies control signal to the grid of switch element Mn, so that switch element Mn opens.Switch element Mn
After being unlocked, export gamma reference voltage from the drain electrode of this switch element Mn.Here, the gal of the drain electrode output of this switch element Mn
The dutycycle of the control signal that horse reference voltage is exported with controller Cn, the magnitude of voltage of the first power supply A output and second source B are defeated
The magnitude of voltage going out is relevant.
In the present invention one preferred embodiment, the dutycycle of gamma reference voltage and control signal of pole output, first
The relation of the magnitude of voltage of the magnitude of voltage of power supply A output and second source B output meets following formula：
U=d*UA+ (1-d) * UB
In above formula, U represents gamma reference voltage, and d represents the dutycycle of control signal, and UA represents the first power supply output
Magnitude of voltage, UB represents the magnitude of voltage of second source output.
Based on above-mentioned analysis it is seen that the present embodiment gamma reference voltage produces circuit can bring following beneficial effect：
The gamma reference voltage of the present embodiment produce circuit have a plurality of independent of each other for producing gamma reference voltage
Voltage generation sub-circuit.Voltage generation sub-circuit includes switch element.Voltage generation sub-circuit can produce with for controlling
The related gamma reference voltage of the dutycycle of the control signal of switch element.It can be seen that, the present embodiment can solve the problem that generation gamma ginseng
The defect that the mode examining voltage has operation inconvenience, modulability is poor, cost is big, makes the display surface of Thin Film Transistor-LCD
The convenient regulation of brightness that plate produces.
Not only circuit is simple for the present embodiment, and only needs to input low-voltage (such as 3.3V) and just can produce Gamma reference electricity
Pressure.Therefore, the present embodiment, while cost-effective, has reached the purpose of convenience regulation.
Embodiment two：
Fig. 4 shows the principle schematic of gamma reference voltage generation circuit in embodiment two.This gamma reference voltage produces
The data-driven module that raw circuit is used for as display panels provides one or more groups of gamma reference voltages.Gamma reference voltage
Act on the display floater of Thin Film Transistor-LCD, so that display floater produces different brightness.
With reference to Fig. 4, the present embodiment gamma reference voltage produce circuit include the first power supply A, second source B and at least one
Voltage generation sub-circuit 5.In a preferred embodiment, gamma reference voltage produces each the voltage generation sub-circuit in circuit
5 structure is all identical.
Specifically, voltage generation sub-circuit 5 includes switch element M1, M2 ... ..., Mn, load resistance R1, R2 ... ..., Rn
With controller C1, C2 ..., Cn.
Below account for voltage is come with the voltage generation sub-circuit 5 of inclusion switch element Mn, load resistance Rn and controller Cn
The preferred structure of generation sub-circuit.
The source electrode of switch element Mn connects the outfan of the first power supply A.The drain electrode of switch element Mn connects load resistance Rn
One end, the other end of load resistance Rn connects the outfan of second source B.The drain electrode of switch element Mn produces son as voltage
The outfan of circuit 5.
The grid of switch element Mn connects the control signal outfan of controller Cn.Controller Cn has difference by output
The control signal of dutycycle produces the gamma reference voltage that is associated with dutycycle making voltage generation sub-circuit 5.
At least include a voltage generation sub-circuit 5 because gamma reference voltage produces circuit, and each voltage produces son
Circuit 5 is corresponding to produce a gamma reference voltage, and therefore gamma reference voltage produces circuit and at least produces a Gamma reference electricity
Pressure.Gamma reference voltage as shown in Figure 4 produces circuit and can produce n gamma ginseng corresponding to n voltage generation sub-circuit 5 respectively
Examine voltage.
To illustrate below taking inclusion switch element Mn, the voltage generation sub-circuit 5 of load resistance Rn and controller Cn as a example
The present embodiment gamma reference voltage produces the operation principle of circuit.
In order that forming voltage difference between the first power supply A and second source B, and electric current is allowed to have certain flow direction, this reality
The voltage applying example setting the first power supply A output is higher than the voltage of second source B output.So, electric current can be defeated from the first power supply
Go out end and be flowed into the source electrode of switch element Mn, then flow out through the drain electrode of switch element Mn, return to the through load resistance Rn
Two power supply B.
Controller Cn applies control signal to the grid of switch element Mn, so that switch element Mn opens.Switch element Mn
After being unlocked, export gamma reference voltage from the drain electrode of this switch element Mn.Here, the gal of the drain electrode output of this switch element Mn
The dutycycle of the control signal that horse reference voltage is exported with controller Cn, the magnitude of voltage of the first power supply A output and second source B are defeated
The magnitude of voltage going out is relevant, unrelated with load resistance Rn.Load resistance Rn has the work of absorption to the excess voltage producing in circuit
With, other unstable voltages that can effectively produce in absorbing circuit it is ensured that the stability of circuit, can't affect to export
Gamma reference voltage value.
In the present invention one preferred embodiment, the gamma reference voltage of output and the dutycycle of control signal, the first electricity
The relation of the magnitude of voltage of the magnitude of voltage of source A output and second source B output meets following formula：
U=d*UA+ (1-d) * UB
In above formula, U represents gamma reference voltage, and d represents the dutycycle of control signal, and UA represents the first power supply output
Magnitude of voltage, UB represents the magnitude of voltage of second source output.
Based on above-mentioned analysis it is seen that the present embodiment gamma reference voltage produces circuit can bring following beneficial effect：
The gamma reference voltage of the present embodiment produce circuit have a plurality of independent of each other for producing gamma reference voltage
Voltage generation sub-circuit.Voltage generation sub-circuit includes switch element and load resistance.Voltage generation sub-circuit can produce
The gamma reference voltage related to the dutycycle of the control signal for controlling switch element.Load resistance is to generation in circuit
Excess voltage has the effect of absorption it is ensured that the stable output of gamma reference voltage.It can be seen that, the present embodiment can solve the problem that generation
The defect that the mode of gamma reference voltage has operation inconvenience, modulability is poor, cost is big, makes Thin Film Transistor-LCD
The convenient regulation of brightness that display floater produces.
Not only circuit is simple for the present embodiment, and only needs to input low-voltage (such as 3.3V) and just can produce Gamma reference electricity
Pressure.Therefore, the present embodiment, while cost-effective, has reached the purpose of convenience regulation.
Embodiment three：
Display panels in the present embodiment are using realizing by the way of embodiment one or by the way of embodiment two
Realize.Carried using the data-driven module that the circuit of embodiment one or the circuit of embodiment two can be all display panels
For one or more groups of gamma reference voltages.Gamma reference voltage acts on the display floater of Thin Film Transistor-LCD, with
Display floater is made to produce different brightness.
Being widely used of display panels, is described below the electronics that the display panels of lower application the present embodiment are realized
Product.
Display panels can be applied to panel computer, mobile phone, automobile control panel, temperature display floater, watch-dog,
Videophone etc. is be applied to the electronic equipment having display picture effect.It can be seen that, the application of display panels is extensively.
Based on above-mentioned analysis it is seen that the present embodiment display panels can bring following beneficial effect：
The display panels of the present embodiment have a plurality of voltage for producing gamma reference voltage independent of each other and produce
Raw electronic circuit.The mode that voltage generation sub-circuit produces gamma reference voltage is simple, and adjustability is strong, so that film crystal
The convenient regulation of brightness that the display floater of pipe liquid crystal display produces.It can be seen that, the present embodiment can solve the problem that generation Gamma reference electricity
The defect that the mode of pressure has operation inconvenience, modulability is poor, cost is big.
The circuit that the present embodiment is constituted for adjustable liquid crystal display display floater brightness simple it is only necessary to low electricity is inputted to circuit
Pressure (such as 3.3V) just can produce gamma reference voltage, so that adjustable liquid crystal display display floater brightness is simple.Therefore, this reality
Apply example while cost-effective, reach the purpose of convenience regulation.
Although herein with reference to specific embodiment, the present invention to be described it should be understood that, these are real
Apply the example that example is only principles and applications.It should therefore be understood that exemplary embodiment can be carried out
Many modifications, and can be designed that other arrangements, the spirit of the present invention being limited without departing from claims
And scope.It should be understood that can come by way of different from described by original claim with reference to different appurtenances
Profit requires and feature specifically described herein.It will also be appreciated that can use with reference to the feature described by separate embodiments
In other described embodiments.
Claims (9)
1. a kind of gamma reference voltage produces circuit it is characterised in that including the first power supply, second source and at least one voltage
Generation sub-circuit；The voltage of described first power supply output is higher than the voltage of described second source output；
Described voltage generation sub-circuit includes switch element and controller, wherein：
The source electrode of described switch element connects the outfan of described first power supply；
As the output of described voltage generation sub-circuit after the outfan of the drain electrode described second source of connection of described switch element
End；
The grid of described switch element connects the control signal outfan of described controller, and described controller is had not by output
Described voltage generation sub-circuit is made to produce the gamma reference voltage being associated with described dutycycle with the control signal of dutycycle.
2. gamma reference voltage according to claim 1 produces circuit it is characterised in that the electricity of described first power supply output
Pressure value is more than or equal to the maximum of the gamma reference voltage that each described voltage generation sub-circuit produces.
3. gamma reference voltage according to claim 1 produces circuit it is characterised in that the electricity of described second source output
Pressure value is less than or equal to the minima of the gamma reference voltage that each described voltage generation sub-circuit produces.
4. gamma reference voltage according to claim 1 produces circuit it is characterised in that described voltage generation sub-circuit produces
Raw gamma reference voltage meets：
U=d*UA+ (1-d) * UB
Wherein, U represents gamma reference voltage, and d represents the dutycycle of described control signal, and UA represents described first power supply output
Magnitude of voltage, UB represents the magnitude of voltage of described second source output.
5. gamma reference voltage according to claim 1 produce circuit it is characterised in that described voltage generation sub-circuit also
Including resistance, wherein, the outfan that described resistance connects described second source is passed through in the drain electrode of described switch element.
6. gamma reference voltage according to claim 5 produces circuit it is characterised in that described resistance is load resistance.
7. gamma reference voltage according to any one of claim 1 to 6 produces circuit it is characterised in that described switch
Element is mos field effect transistor.
8. a kind of display panels are it is characterised in that include the Gamma reference electricity as any one of claim 1 to 7
Pressure produces circuit.
9. display panels according to claim 8 are it is characterised in that described gamma reference voltage produces the of circuit
One power supply and second source are respectively positioned in the drive control plate of described display panels.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610796784.2A CN106384579B (en) | 2016-08-31 | 2016-08-31 | Gamma reference voltage generation circuit, liquid crystal display panel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610796784.2A CN106384579B (en) | 2016-08-31 | 2016-08-31 | Gamma reference voltage generation circuit, liquid crystal display panel |
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| CN106384579A true CN106384579A (en) | 2017-02-08 |
| CN106384579B CN106384579B (en) | 2019-03-12 |
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| CN109509420A (en) * | 2018-12-25 | 2019-03-22 | 惠科股份有限公司 | Generating circuit from reference voltage and display device |
| CN115631713A (en) * | 2022-11-09 | 2023-01-20 | 武汉天马微电子有限公司 | Driving module and driving method thereof, display panel and display device |
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| CN106384579B (en) | 2019-03-12 |
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