CN106356032A - Gamma correction circuit and operation method thereof - Google Patents
Gamma correction circuit and operation method thereof Download PDFInfo
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- CN106356032A CN106356032A CN201611032731.XA CN201611032731A CN106356032A CN 106356032 A CN106356032 A CN 106356032A CN 201611032731 A CN201611032731 A CN 201611032731A CN 106356032 A CN106356032 A CN 106356032A
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- gamma
- operational amplifier
- controlling switch
- outfan
- little
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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
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
-
- 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
-
- 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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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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 provides a gamma correction circuit and an operation method thereof. In the gamma correction circuit, an nth operational amplifier (OP(n)) is arranged between a 2n-1th gamma binding point and a 2nth gamma binding point; the 2n-1th gamma binding point comprises a 2n-1th control switch (K(2n-1)) used for being connected or disconnected with the output terminal of the nth operational amplifier (OP(n)) and a 2n-1th capacitor (C(2n-1)) the two ends of which are electrically connected with the 2n-1th control switch (K(2n-1)) and grounded respectively; the 2nth gamma binding point comprises a 2nth control switch (K(2n)) used for being connected or disconnected with the output terminal nth operational amplifier (OP(n)) and a 2nth capacitor (C(2n)) the two ends of which are electrically connected with the 2nth control switch (K(2n)) and grounded respectively; and multiplexing of the operational amplifier is realized. Compared with the prior art, the gamma correction circuit has the advantages that the quantity of the operational amplifiers can be halved, and the area of a mobile phone display screen driver IC and cost are reduced.
Description
Technical field
The present invention relates to display technology field, more particularly, to a kind of gamma-correction circuit and its operational approach.
Background technology
Liquid crystal display has that fuselage is thin, power saving, the many merits such as radiationless, obtained widely applying, such as: liquid crystal electricity
Depending on, smart mobile phone, personal digital assistant (pda), digital camera, computer screen or notebook computer screen etc..
At present, the LCDs of main flow lcd are by one sheet of film transistor (TFT) array substrate (thin film
Transistor array substrate, tft array substrate) and a piece of colored filter substrate (color
Filter, cf) laminating forms, and pour into liquid crystal between tft substrate and cf substrate, to control liquid crystal molecule by whether being energized
Change direction, the light of backlight portion is reflected generation picture.
Now, mobile phone is popular the most frequently used electronic product.In order that mobile phone display screen has more preferable display effect, handss
The driving chip (driver ic) of machine display screen, is generally termed driving ic, all embedded in gamma in its inside structure
(gamma) correction module.
As shown in figure 1, the driving ic of current mobile phone display screen includes signal receiver 100, the dynamic backlight sequentially connected
Adjustment module (cabc) 200, clock enable module (clock enable, ce) 300, data latch module 400, level shift
(level shift) module 500, analog-to-digital conversion module 600, source electrode (source) end output module 700, the dynamic back of the body of electric connection
The backlight control module 800 of light adjustment module 200, the gamma correction module 900 being electrically connected with analog-to-digital conversion module 600 and electricity
Property connect power supply (power) module 1000 powered for it of gamma correction module 900.Set inside described gamma correction module 900
There is gamma-correction circuit, the voltage tied up a little by changing the corresponding gamma of gamma-correction circuit changes corresponding to each luma data
Voltage, carries out different degrees of charge and discharge electric treatment to mobile phone display screen, thus reaching more preferable display effect.
Because luma data is converted into after corresponding voltage being to be sent directly into mobile phone display screen by gamma-correction circuit
Carry out discharge and recharge, so must be equipped with operational amplifier (operational amplifier, op) in gamma-correction circuit.
As shown in Fig. 2 existing gamma-correction circuit has multiple gammas tying up a little, each gamma tie up a little except arrange corresponding electric capacity,
Outside resistance, also individually it is equipped with an operational amplifier, that is, n-th (n is positive integer) is individual ties up n-th operational amplifier op of inclusion
N (), two ends are electrically connected with n-th electric capacity c (n) and electrically of n-th operational amplifier op (n) outfan and ground connection
Connect n-th resistance r (n) of n-th operational amplifier op (n) outfan, n-th gamma electric voltage v (n) of final output, for example
Tie up a 1st operational amplifier op (1) of inclusion, the 1st electric capacity c (1) and the 1st resistance r (1), final output the 1st for 1st
Individual gamma electric voltage v (1), the like.It is also more that gamma ties up a little more, required operational amplifiers, and operational amplifier is mould
Intend what circuit was constituted, its quantity is more, the area occupying driving ic is bigger, cause to drive the lifting of ic cost.
Content of the invention
It is an object of the invention to provide a kind of gamma-correction circuit, the quantity of operational amplifier can be reduced, reduce handss
Machine display screen drives the cost of ic.
Another object of the present invention is to providing a kind of operational approach of gamma-correction circuit, mobile phone display screen can be reduced
Drive the cost of ic.
For achieving the above object, the present invention provides a kind of gamma-correction circuit, ties up point and located at adjacent including multiple gammas
Two gammas tie up a little between operational amplifier；
If n is positive integer, n-th operational amplifier is tied up a little and between the 2n gamma tie up a little located at the 2n-1 gamma；
Described the 2n-1 gamma is tied up and a little includes the 2n-1 control of the outfan for connecting or disconnecting n-th operational amplifier and open
Close and two ends are electrically connected with the 2n-1 controlling switch and the 2n-1 electric capacity being grounded；Described the 2n gamma is tied up a little
It is electrically connected with including the 2n controlling switch of outfan and two ends for connecting or disconnecting n-th operational amplifier
The 2n controlling switch and the 2n electric capacity being grounded.
Described the 2n-1 gamma is tied up and a little also includes being electrically connected at the 2n-1 resistance of 2n-1 controlling switch；Institute
State the 2n gamma and tie up and a little also include being electrically connected at the 2n resistance of 2n controlling switch.
In the blanking zone of a line video data, first n-th operational amplifier is connected by described the 2n-1 controlling switch
Outfan, n-th operational amplifier phase should carry out discharge and recharge to the 2n-1 electric capacity；Then, described the 2n-1 controlling switch
Disconnect the outfan of n-th operational amplifier, connected the outfan of n-th operational amplifier by the 2n controlling switch, n-th
Operational amplifier phase should carry out discharge and recharge to the 2n electric capacity.
Or the blanking zone in a line video data, first connects n-th operational amplifier by described the 2n controlling switch
Outfan, n-th operational amplifier phase should carry out discharge and recharge to the 2n electric capacity；Then, described the 2n controlling switch is broken
Drive the outfan of n-th operational amplifier, connected the outfan of n-th operational amplifier by the 2n-1 controlling switch, n-th
Operational amplifier phase should carry out discharge and recharge to the 2n-1 electric capacity.
The present invention also provides a kind of operational approach of gamma-correction circuit, comprises the steps:
Step 1, offer mobile phone display screen drive ic, and described mobile phone display screen drives ic to have gamma-correction circuit；
Described gamma-correction circuit include multiple gammas tie up point and located at two neighboring gamma tie up a little between operation amplifier
Device；
If n is positive integer, n-th operational amplifier is tied up a little and between the 2n gamma tie up a little located at the 2n-1 gamma；
Described the 2n-1 gamma is tied up and a little includes the 2n-1 control of the outfan for connecting or disconnecting n-th operational amplifier and open
Close and two ends are electrically connected with the 2n-1 controlling switch and the 2n-1 electric capacity being grounded；Described the 2n gamma is tied up a little
It is electrically connected with including the 2n controlling switch of outfan and two ends for connecting or disconnecting n-th operational amplifier
The 2n controlling switch and the 2n electric capacity being grounded；
When step 2, a line video data arrive, ic is driven to detect the horizontal blanking area of video data；
Step 3, described the 2n-1 controlling switch are connected n-th operation amplifier with one of them of 2n controlling switch
The outfan of device, n-th operational amplifier phase should carry out discharge and recharge to one of them of 2n-1 electric capacity and 2n electric capacity；
Step 4, described the 2n-1 controlling switch disconnect n-th operation amplifier with one of them of 2n controlling switch
The outfan of device, described the 2n-1 controlling switch is connected n-th operational amplifier with another in the 2n controlling switch
Outfan, mutually should carry out discharge and recharge to another in 2n-1 electric capacity and the 2n electric capacity；
When step 5, next line video data arrive, repeat step 2 is to step 4.
Optionally, described step 3 is: described the 2n-1 controlling switch connects the outfan of n-th operational amplifier, the
N operational amplifier phase should carry out discharge and recharge to the 2n-1 electric capacity；
Described step 4 is: described the 2n-1 controlling switch disconnects the outfan of n-th operational amplifier, described 2n
Individual controlling switch connects the outfan of n-th operational amplifier, mutually should carry out discharge and recharge to the 2n electric capacity.
Optionally, described step 3 is: described the 2n controlling switch connects the outfan of n-th operational amplifier, accordingly
Discharge and recharge is carried out to the 2n electric capacity；
Described step 4 is: described the 2n controlling switch disconnects the outfan of n-th operational amplifier, described 2n-1
Individual controlling switch connects the outfan of n-th operational amplifier, and n-th operational amplifier phase should be filled to the 2n-1 electric capacity
Electric discharge.
Described the 2n-1 gamma is tied up and a little also includes being electrically connected at the 2n-1 resistance of 2n-1 controlling switch；Institute
State the 2n gamma and tie up and a little also include being electrically connected at the 2n resistance of 2n controlling switch.
Beneficial effects of the present invention: a kind of gamma-correction circuit and its operational approach that the present invention provides, by n-th computing
Amplifier is tied up a little and between the 2n gamma tie up a little located at the 2n-1 gamma；Described the 2n-1 gamma is tied up and a little includes for even
Connect or disconnect 2n-1 controlling switch of the outfan of n-th operational amplifier and two ends are electrically connected with 2n-1
Controlling switch and the 2n-1 electric capacity being grounded；Described the 2n gamma is tied up and a little includes putting for connecting or disconnecting n-th computing
The 2n controlling switch of outfan of big device and two ends are electrically connected with the 2n controlling switch and the 2n electricity being grounded
Hold, an a little shared operational amplifier is tied up by two neighboring gamma and realizes operational amplifier multiplexing, compared to prior art energy
Enough area and costs halving the quantity of operational amplifier, reducing mobile phone display screen driving ic, thus reduce mobile phone display screen
The cost of module.
Brief description
In order to be able to be further understood that feature and the technology contents of the present invention, refer to detailed below in connection with the present invention
Illustrate and accompanying drawing, but accompanying drawing only provides and uses with reference to explanation, is not used for the present invention is any limitation as.
In accompanying drawing,
Fig. 1 is the block architecture diagram of the driving ic of existing mobile phone display screen；
Fig. 2 is the circuit diagram of existing gamma-correction circuit；
Fig. 3 is the circuit diagram of the gamma-correction circuit of the present invention；
Fig. 4 is the flow chart of the operational approach of gamma-correction circuit of the present invention.
Specific embodiment
For further illustrating the technological means and its effect that the present invention taken, being preferable to carry out below in conjunction with the present invention
Example and its accompanying drawing are described in detail.
The present invention provides a kind of gamma-correction circuit based on the thought that operational amplifier is multiplexed.Mobile phone display screen drives ic to exist
When processing the video data that input is come in, not all data will send into mobile phone display screen, and one-frame video data comprises
Effective display area and row field blanking area, and every row video data Dou Shiyou horizontal blanking area substantially, the video data in horizontal blanking area
It is invalid, gamma-correction circuit not output voltage in this case, this is just respectively to phase using an operational amplifier
The electric capacity that adjacent two gammas are tied up a little carries out discharge and recharge, and the feature using capacitance voltage stabilizing provides gamma reference voltage to create machine
Meeting.
As shown in figure 3, the gamma-correction circuit of the present invention includes multiple gammas and tying up point and ties up a little located at two neighboring gamma
Between operational amplifier.
If n is positive integer, n-th operational amplifier op (n) is tied up located at the 2n-1 gamma and is a little tied up a little with the 2n gamma
Between；Described the 2n-1 gamma tie up a little include for connect or disconnect n-th operational amplifier op (n) outfan
2n-1 controlling switch k (2n-1) and two ends are electrically connected with the 2n-1 controlling switch k (2n-1) and the 2n-1 being grounded
Individual electric capacity c (2n-1)；Described the 2n gamma ties up the output a little including for connecting or disconnecting n-th operational amplifier op (n)
The 2n controlling switch k (2n) at end and two ends are electrically connected with the 2n controlling switch k (2n) and the 2n electricity being grounded
Hold c (2n).
Further, described the 2n-1 gamma is tied up and a little also includes being electrically connected at the 2n-1 controlling switch k (2n-1)
The 2n-1 resistance r (2n-1)；Described the 2n gamma is tied up and a little also includes being electrically connected at the 2n controlling switch k (2n)
The 2n resistance r (2n).
Described the 2n-1 gamma is tied up and is a little used for the 2n-1 gamma electric voltage v (2n-1) of output, and the 2n gamma ties up a use
In exporting the 2n gamma electric voltage v (2n).
It is illustrated below: the 1st operational amplifier op (1) is tied up located at the 1st gamma and a little tied up point with the 2nd gamma
Between；Described 1st gamma ties up the 1st of the outfan control a little including for connecting or disconnecting the 1st operational amplifier op (1)
Switch k (1) and two ends are electrically connected with the 1st controlling switch k (1) and the 1st electric capacity c (1) being grounded；Described 2nd gal
Horse tie up a little include for connect or disconnect the 1st operational amplifier op (1) outfan the 2nd controlling switch k (2) and two
End is electrically connected with the 2nd electric capacity c (2) of the 2nd controlling switch k (2) and ground connection；Further, described 1st gamma is tied up
Point also includes being electrically connected at the 1st resistance r (1) of the 1st controlling switch k (1)；Described 2nd gamma is tied up and a little also includes electricity
Property is connected to the 2nd resistance r (2) of the 2nd controlling switch k (2)；Described 1st gamma is tied up and is a little used for the 1st gamma electricity of output
Pressure v (1), the 2nd gamma is tied up and is a little used for the 2nd gamma electric voltage v (2) of output；
2nd operational amplifier op (2) is tied up a little and between the 4th gamma tie up a little located at the 3rd gamma；Described 3rd gal
Horse tie up a little include for connect or disconnect the 2nd operational amplifier op (2) outfan the 3rd controlling switch k (3) and two
End is electrically connected with the 3rd electric capacity c (3) of the 3rd controlling switch k (3) and ground connection；Described 4th gamma is tied up and a little includes using
Electrically connect respectively in the 4th controlling switch k (4) of connection or the outfan disconnecting the 2nd operational amplifier op (2) and two ends
Connect the 4th electric capacity c (4) of the 4th controlling switch k (4) and ground connection；Further, described 3rd gamma is tied up and a little also includes electrically
It is connected to the 3rd resistance r (3) of the 3rd controlling switch k (3)；Described 4th gamma is tied up and a little also includes being electrically connected at the 4th
4th resistance r (4) of controlling switch k (4)；Described 3rd gamma is tied up and is a little used for the 3rd gamma electric voltage v (3) of output, the 4th
Gamma is tied up and is a little used for the 4th gamma electric voltage v (4) of output.
The rest may be inferred.
Optionally, in the blanking zone of a line video data, first connect n-th by described the 2n-1 controlling switch k (2n-1)
The outfan of individual operational amplifier op (n), n-th operational amplifier op (n) is mutually tackled the 2n-1 electric capacity c (2n-1) and is filled
Electric discharge, provides the 2n-1 gamma to tie up gamma reference voltage a little using the feature of capacitance voltage stabilizing；Then, described 2n-1
Controlling switch k (2n-1) disconnects the outfan of n-th operational amplifier op (n), connects n-th by the 2n controlling switch k (2n)
The outfan of individual operational amplifier op (n), n-th operational amplifier op (n) is mutually tackled the 2n electric capacity c (2n) and is carried out charge and discharge
Electricity, provides the 2n gamma to tie up gamma reference voltage a little using the feature of capacitance voltage stabilizing.
Include as a example 8 gammas tie up a little by described gamma-correction circuit, that is, first by the 1st, 3,5,7 controlling switches k (1), k
(3), k (5), k (7) connect the 1st, 2,3,4 operational amplifier op (1), op (2), op (3), the outfans of op (4) respectively, the
1st, 2,3,4 operational amplifier op (1), op (2), op (3), op (4) are respectively to the 1st, 3,5,7 electric capacity c (1), c (3), c
(5), c (7) carries out discharge and recharge, provides the 1st, 3,5,7 gammas to tie up Gamma reference a little respectively using the feature of capacitance voltage stabilizing
Voltage；Then, described 1,3,5,7 controlling switches k (1), k (3), k (5), k (7) are each turned off the 1st, 2,3,4 operation amplifiers
Device op (1), op (2), op (3), the outfan of op (4), by the 2nd, 4,6,8 controlling switches k (2), k (4), k (6), k (8) point
Not Lian Jie the 1st, 2,3,4 operational amplifier op (1), op (2), op (3), the outfans of op (4), the 1st, 2,3,4 computings put
Big device op (1), op (2), op (3), op (4) carry out discharge and recharge to 2,4,6,8 electric capacity c (2), c (4), c (6), c (8) respectively,
The 2nd, 4,6,8 gammas are provided to tie up gamma reference voltage a little respectively using the feature of capacitance voltage stabilizing.
It is of course also possible in the blanking zone of a line video data, first connect n-th by described the 2n controlling switch k (2n)
The outfan of individual operational amplifier op (n), n-th operational amplifier op (n) is mutually tackled the 2n electric capacity c (2n) and is carried out charge and discharge
Electricity；Then, described the 2n controlling switch k (2n) disconnects the outfan of n-th operational amplifier op (n), is controlled by the 2n-1
System switch k (2n-1) connects the outfan of n-th operational amplifier op (n), and n-th operational amplifier op (n) mutually tackles 2n-
1 electric capacity c (2n-1) carries out discharge and recharge.
Still include as a example 8 gammas tie up a little by described gamma-correction circuit, that is, first by the 2nd, 4,6,8 controlling switches k
(2), k (4), k (6), k (8) connect the 1st, 2,3,4 operational amplifier op (1), op (2), op (3), the outputs of op (4) respectively
End, the 1st, 2,3,4 operational amplifier op (1), op (2), op (3), op (4) are respectively to the 2nd, 4,6,8 electric capacity c (2), c
(4), c (6), c (8) carry out discharge and recharge, provide the 2nd, 4,6,8 gammas to tie up gamma a little respectively using the feature of capacitance voltage stabilizing
Reference voltage；Then, described 2,4,6,8 controlling switches k (2), k (4), k (6), k (8) are each turned off the 1st, 2,3,4 computings
Amplifier op (1), op (2), op (3), the outfan of op (4), by the 1st, 3,5,7 controlling switches k (1), k (3), k (5), k
(7) the 1st, 2,3,4 operational amplifier op (1), op (2), op (3), the outfans of op (4), the 1st, 2,3,4 fortune are connected respectively
Calculation amplifier op (1), op (2), op (3), op (4) carry out charge and discharge to 1,3,5,7 electric capacity c (1), c (3), c (5), c (7) respectively
Electricity, provides the 1st, 3,5,7 gammas to tie up gamma reference voltage a little using the feature of capacitance voltage stabilizing respectively.
The gamma-correction circuit of the present invention is tied up by two neighboring gamma and is a little shared an operational amplifier and realize computing and put
The quantity of operational amplifier can be halved compared to prior art, reduce the area that mobile phone display screen drives ic by big device multiplexing
And cost, thus reduce the cost of mobile phone display screen module.
Refer to Fig. 4, in conjunction with Fig. 3, the present invention also provides a kind of operational approach of gamma-correction circuit, walk including following
Rapid:
Step 1, offer mobile phone display screen drive ic, and described mobile phone display screen drives ic to have gamma-correction circuit.
As shown in figure 3, the gamma-correction circuit of the present invention includes multiple gammas and tying up point and ties up a little located at two neighboring gamma
Between operational amplifier.
If n is positive integer, n-th operational amplifier op (n) is tied up located at the 2n-1 gamma and is a little tied up a little with the 2n gamma
Between；Described the 2n-1 gamma tie up a little include for connect or disconnect n-th operational amplifier op (n) outfan
2n-1 controlling switch k (2n-1) and two ends are electrically connected with the 2n-1 controlling switch k (2n-1) and the 2n-1 being grounded
Individual electric capacity c (2n-1)；Described the 2n gamma ties up the output a little including for connecting or disconnecting n-th operational amplifier op (n)
The 2n controlling switch k (2n) at end and two ends are electrically connected with the 2n controlling switch k (2n) and the 2n electricity being grounded
Hold c (2n).
Further, described the 2n-1 gamma is tied up and a little also includes being electrically connected at the 2n-1 controlling switch k (2n-1)
The 2n-1 resistance r (2n-1)；Described the 2n gamma is tied up and a little also includes being electrically connected at the 2n controlling switch k (2n)
The 2n resistance r (2n).
Described the 2n-1 gamma is tied up and is a little used for the 2n-1 gamma electric voltage v (2n-1) of output, and the 2n gamma ties up a use
In exporting the 2n gamma electric voltage v (2n).
It is illustrated below: the 1st operational amplifier op (1) is tied up located at the 1st gamma and a little tied up point with the 2nd gamma
Between；Described 1st gamma ties up the 1st of the outfan control a little including for connecting or disconnecting the 1st operational amplifier op (1)
Switch k (1) and two ends are electrically connected with the 1st controlling switch k (1) and the 1st electric capacity c (1) being grounded；Described 2nd gal
Horse tie up a little include for connect or disconnect the 1st operational amplifier op (1) outfan the 2nd controlling switch k (2) and two
End is electrically connected with the 2nd electric capacity c (2) of the 2nd controlling switch k (2) and ground connection；Further, described 1st gamma is tied up
Point also includes being electrically connected at the 1st resistance r (1) of the 1st controlling switch k (1)；Described 2nd gamma is tied up and a little also includes electricity
Property is connected to the 2nd resistance r (2) of the 2nd controlling switch k (2)；Described 1st gamma is tied up and is a little used for the 1st gamma electricity of output
Pressure v (1), the 2nd gamma is tied up and is a little used for the 2nd gamma electric voltage v (2) of output；
2nd operational amplifier op (2) is tied up a little and between the 4th gamma tie up a little located at the 3rd gamma；Described 3rd gal
Horse tie up a little include for connect or disconnect the 2nd operational amplifier op (2) outfan the 3rd controlling switch k (3) and two
End is electrically connected with the 3rd electric capacity c (3) of the 3rd controlling switch k (3) and ground connection；Described 4th gamma is tied up and a little includes using
Electrically connect respectively in the 4th controlling switch k (4) of connection or the outfan disconnecting the 2nd operational amplifier op (2) and two ends
Connect the 4th electric capacity c (4) of the 4th controlling switch k (4) and ground connection；Further, described 3rd gamma is tied up and a little also includes electrically
It is connected to the 3rd resistance r (3) of the 3rd controlling switch k (3)；Described 4th gamma is tied up and a little also includes being electrically connected at the 4th
4th resistance r (4) of controlling switch k (4)；Described 3rd gamma is tied up and is a little used for the 3rd gamma electric voltage v (3) of output, the 4th
Gamma is tied up and is a little used for the 4th gamma electric voltage v (4) of output.
The rest may be inferred.
When step 2, a line video data arrive, ic is driven to detect the horizontal blanking area of video data.
Step 3, described the 2n-1 controlling switch k (2n-1) are connected with one of them of the 2n controlling switch k (2n)
The outfan of n-th operational amplifier op (n), n-th operational amplifier op (n) mutually tackle the 2n-1 electric capacity c (2n-1) with
One of them of the 2n electric capacity c (2n) carries out discharge and recharge.
Step 4, described the 2n-1 controlling switch k (2n-1) and one of them of the 2n controlling switch k (2n) disconnect
The outfan of n-th operational amplifier op (n), described the 2n-1 controlling switch k (2n-1) and the 2n controlling switch k (2n)
In another connect the outfan of n-th operational amplifier op (n), mutually tackle the 2n-1 electric capacity c (2n-1) and 2n individual
Another in electric capacity c (2n) carries out discharge and recharge.
When step 5, next line video data arrive, repeat step 2 is to step 4.
Optionally, described step 3 is: described the 2n-1 controlling switch k (2n-1) connects n-th operational amplifier op
N the outfan of (), n-th operational amplifier op (n) is mutually tackled the 2n-1 electric capacity c (2n-1) and is carried out discharge and recharge；Described step 4
For: described the 2n-1 controlling switch k (2n-1) disconnects the outfan of n-th operational amplifier op (n), described the 2n control
Switch k (2n) connects the outfan of n-th operational amplifier op (n), mutually tackles the 2n electric capacity c (2n) and carries out discharge and recharge.
Include as a example 8 gammas tie up a little by described gamma-correction circuit, then described step 3 is: the 1st, 3,5,7 control
Switch k (1), k (3), k (5), k (7) connect the 1st, 2,3,4 operational amplifier op (1), op (2), op (3), op (4) respectively
Outfan, the 1st, 2,3,4 operational amplifier op (1), op (2), op (3), op (4) respectively to the 1st, 3,5,7 electric capacity c (1),
C (3), c (5), c (7) carry out discharge and recharge, provide the 1st, 3,5,7 gammas to tie up gal a little respectively using the feature of capacitance voltage stabilizing
Horse reference voltage；Described step 4 is: described 1,3,5,7 controlling switches k (1), k (3), k (5), k (7) be each turned off the 1st, 2,
3rd, 4 operational amplifier op (1), op (2), op (3), outfans of op (4), by the 2nd, 4,6,8 controlling switches k (2), k
(4), k (6), k (8) connect the 1st, 2,3,4 operational amplifier op (1), op (2), op (3), the outfans of op (4) respectively, the
1st, 2,3,4 operational amplifier op (1), op (2), op (3), op (4) are respectively to 2,4,6,8 electric capacity c (2), c (4), c (6), c
(8) carry out discharge and recharge, provide the 2nd, 4,6,8 gammas to tie up gamma reference voltage a little respectively using the feature of capacitance voltage stabilizing.
Optionally, described step 3 is: described the 2n controlling switch k (2n) connects n-th operational amplifier op (n)
Outfan, mutually tackles the 2n electric capacity c (2n) and carries out discharge and recharge；Described step 4 is: described the 2n controlling switch k (2n) is broken
Drive the outfan of n-th operational amplifier op (n), described the 2n-1 controlling switch k (2n-1) connects n-th operational amplifier
The outfan of op (n), n-th operational amplifier op (n) is mutually tackled the 2n-1 electric capacity c (2n-1) and is carried out discharge and recharge.
Still include as a example 8 gammas tie up a little by described gamma-correction circuit, then described step 3 is: the 2nd, 4,6,8 controls
System switch k (2), k (4), k (6), k (8) connect the 1st, 2,3,4 operational amplifier op (1), op (2), op (3), op (4) respectively
Outfan, the 1st, 2,3,4 operational amplifier op (1), op (2), op (3), op (4) are respectively to the 2nd, 4,6,8 electric capacity c
(2), c (4), c (6), c (8) carry out discharge and recharge, provide the 2nd, 4,6,8 gammas to tie up a little respectively using the feature of capacitance voltage stabilizing
Gamma reference voltage；Described step 4 is: described 2,4,6,8 controlling switches k (2), k (4), k (6), k (8) are each turned off
1st, 2,3,4 operational amplifier op (1), op (2), op (3), outfans of op (4), by the 1st, 3,5,7 controlling switches k (1),
K (3), k (5), k (7) connect the 1st, 2,3,4 operational amplifier op (1), op (2), op (3), the outfans of op (4) respectively, the
1st, 2,3,4 operational amplifier op (1), op (2), op (3), op (4) are respectively to 1,3,5,7 electric capacity c (1), c (3), c (5), c
(7) carry out discharge and recharge, provide the 1st, 3,5,7 gammas to tie up gamma reference voltage a little respectively using the feature of capacitance voltage stabilizing.
The operational approach of above-mentioned gamma-correction circuit achieves operational amplifier multiplexing, can will transport compared to prior art
The quantity calculating amplifier halves, and reduces area and the cost that mobile phone display screen drives ic, thus reducing mobile phone display screen module
Cost.
In sum, the gamma-correction circuit of the present invention and its operational approach, by n-th operational amplifier located at 2n-1
Individual gamma is tied up a little and between the 2n gamma tie up a little；Described the 2n-1 gamma is tied up and a little includes for connecting or disconnecting n-th fortune
Calculate the 2n-1 controlling switch of outfan of amplifier and two ends are electrically connected with the 2n-1 controlling switch and ground connection
The 2n-1 electric capacity；Described the 2n gamma tie up a little include for connect or disconnect n-th operational amplifier outfan
2n controlling switch and two ends are electrically connected with the 2n controlling switch and the 2n electric capacity being grounded, by two neighboring
Gamma is tied up an a little shared operational amplifier and realizes operational amplifier multiplexing, can be by operational amplifier compared to prior art
Quantity halves, and reduces area and the cost that mobile phone display screen drives ic, thus reducing the cost of mobile phone display screen module.
The above, for the person of ordinary skill of the art, can be with technology according to the present invention scheme and technology
Design is made other various corresponding changes and is deformed, and all these change and deformation all should belong to the appended right of the present invention
The protection domain requiring.
Claims (8)
1. a kind of gamma-correction circuit is it is characterised in that include between multiple gammas tie up point and tie up a little located at two neighboring gamma
Operational amplifier；
If n is positive integer, n-th operational amplifier (op (n)) is tied up located at the 2n-1 gamma and is a little tied up point with the 2n gamma
Between；Described the 2n-1 gamma tie up a little include for connect or disconnect n-th operational amplifier (op (n)) outfan
2n-1 controlling switch (k (2n-1)) and two ends are electrically connected with the of the 2n-1 controlling switch (k (2n-1)) and ground connection
2n-1 electric capacity (c (2n-1))；Described the 2n gamma is tied up and a little includes for connecting or disconnecting n-th operational amplifier (op
(n)) the 2n controlling switch (k (2n)) of outfan and two ends be electrically connected with the 2n controlling switch (k (2n)) with
The 2n electric capacity (c (2n)) of ground connection.
2. gamma-correction circuit as claimed in claim 1 is it is characterised in that described the 2n-1 gamma is tied up a little also includes electrically
It is connected to the 2n-1 resistance (r (2n-1)) of the 2n-1 controlling switch (k (2n-1))；Described the 2n gamma is tied up and a little also wraps
Include the 2n resistance (r (2n)) being electrically connected at the 2n controlling switch (k (2n)).
3. gamma-correction circuit as claimed in claim 1 it is characterised in that a line video data blanking zone, first by institute
State the outfan that the 2n-1 controlling switch (k (2n-1)) connects n-th operational amplifier (op (n)), n-th operational amplifier
(op (n)) mutually tackles the 2n-1 electric capacity (c (2n-1)) and carries out discharge and recharge；Then, described the 2n-1 controlling switch (k (2n-
1)) disconnect the outfan of n-th operational amplifier (op (n)), n-th computing is connected by the 2n controlling switch (k (2n)) and puts
The outfan of big device (op (n)), n-th operational amplifier (op (n)) is mutually tackled the 2n electric capacity (c (2n)) and is carried out discharge and recharge.
4. gamma-correction circuit as claimed in claim 1 it is characterised in that a line video data blanking zone, first by institute
State the outfan that the 2n controlling switch (k (2n)) connects n-th operational amplifier (op (n)), n-th operational amplifier (op
(n)) mutually tackle the 2n electric capacity (c (2n)) and carry out discharge and recharge；Then, described the 2n controlling switch (k (2n)) disconnects n-th
The outfan of operational amplifier (op (n)), connects n-th operational amplifier (op by the 2n-1 controlling switch (k (2n-1))
(n)) outfan, n-th operational amplifier (op (n)) mutually tackle the 2n-1 electric capacity (c (2n-1)) and carry out discharge and recharge.
5. a kind of operational approach of gamma-correction circuit is it is characterised in that comprise the steps:
Step 1, offer mobile phone display screen drive ic, and described mobile phone display screen drives ic to have gamma-correction circuit；
Described gamma-correction circuit include multiple gammas tie up point and located at two neighboring gamma tie up a little between operational amplifier；
If n is positive integer, n-th operational amplifier (op (n)) is tied up located at the 2n-1 gamma and is a little tied up point with the 2n gamma
Between；Described the 2n-1 gamma tie up a little include for connect or disconnect n-th operational amplifier (op (n)) outfan
2n-1 controlling switch (k (2n-1)) and two ends are electrically connected with the of the 2n-1 controlling switch (k (2n-1)) and ground connection
2n-1 electric capacity (c (2n-1))；Described the 2n gamma is tied up and a little includes for connecting or disconnecting n-th operational amplifier (op
(n)) the 2n controlling switch (k (2n)) of outfan and two ends be electrically connected with the 2n controlling switch (k (2n)) with
The 2n electric capacity (c (2n)) of ground connection；
When step 2, a line video data arrive, ic is driven to detect the horizontal blanking area of video data；
Step 3, described the 2n-1 controlling switch (k (2n-1)) are connected with one of them of the 2n controlling switch (k (2n))
The outfan of n-th operational amplifier (op (n)), n-th operational amplifier (op (n)) mutually tackles the 2n-1 electric capacity (c (2n-
1)) carry out discharge and recharge with one of them of the 2n electric capacity (c (2n))；
Step 4, described the 2n-1 controlling switch (k (2n-1)) are disconnected with one of them of the 2n controlling switch (k (2n))
The outfan of n-th operational amplifier (op (n)), described the 2n-1 controlling switch (k (2n-1)) and the 2n controlling switch
The outfan of another n-th operational amplifier (op (n)) of connection in (k (2n)), mutually tackles the 2n-1 electric capacity (c (2n-
1) another) and in the 2n electric capacity (c (2n)) carries out discharge and recharge；
When step 5, next line video data arrive, repeat step 2 is to step 4.
6. the operational approach of gamma-correction circuit as claimed in claim 5 is it is characterised in that described step 3 is: described
2n-1 controlling switch (k (2n-1)) connects the outfan of n-th operational amplifier (op (n)), n-th operational amplifier (op
(n)) mutually tackle the 2n-1 electric capacity (c (2n-1)) and carry out discharge and recharge；
Described step 4 is: described the 2n-1 controlling switch (k (2n-1)) disconnects the output of n-th operational amplifier (op (n))
End, described the 2n controlling switch (k (2n)) connects the outfan of n-th operational amplifier (op (n)), mutually tackles the 2n electricity
Hold (c (2n)) and carry out discharge and recharge.
7. the operational approach of gamma-correction circuit as claimed in claim 5 is it is characterised in that described step 3 is: described 2n
Individual controlling switch (k (2n)) connects the outfan of n-th operational amplifier (op (n)), mutually tackles the 2n electric capacity (c (2n)) and enters
Row discharge and recharge；
Described step 4 is: described the 2n controlling switch (k (2n)) disconnects the outfan of n-th operational amplifier (op (n)),
Described the 2n-1 controlling switch (k (2n-1)) connects the outfan of n-th operational amplifier (op (n)), n-th operation amplifier
Device (op (n)) is mutually tackled the 2n-1 electric capacity (c (2n-1)) and is carried out discharge and recharge.
8. the operational approach of gamma-correction circuit as claimed in claim 5 is it is characterised in that described the 2n-1 gamma is tied up a little
Also include being electrically connected at the 2n-1 resistance (r (2n-1)) of the 2n-1 controlling switch (k (2n-1))；Described the 2n gal
Horse ties up the 2n resistance (r (2n)) a little also including being electrically connected at the 2n controlling switch (k (2n)).
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| CN201611032731.XA CN106356032B (en) | 2016-11-15 | 2016-11-15 | Gamma-correction circuit and its operating method |
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|---|---|---|---|
| CN201611032731.XA CN106356032B (en) | 2016-11-15 | 2016-11-15 | Gamma-correction circuit and its operating method |
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| CN106356032B (en) | 2019-03-12 |
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