CN105118455B - Gamma voltage generating device and method, liquid crystal display - Google Patents
Gamma voltage generating device and method, liquid crystal display Download PDFInfo
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- CN105118455B CN105118455B CN201510547784.4A CN201510547784A CN105118455B CN 105118455 B CN105118455 B CN 105118455B CN 201510547784 A CN201510547784 A CN 201510547784A CN 105118455 B CN105118455 B CN 105118455B
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Abstract
The invention discloses a kind of gamma voltage generating device and method, liquid crystal display, belong to display technology field.Wherein described device includes：Arithmetic unit, the signal conversion unit being connected with arithmetic unit and source electrode driver, wherein, arithmetic unit, for according to the gamma curve and gamma curvature pre-entered, and the calculation formula of the GTG by prestoring and liquid crystal display transmissivity obtains the corresponding relation between GTG and gamma voltage, according to the corresponding relation between GTG and gamma voltage and the grey decision-making needed for the liquid crystal display prestored, obtain the data signal of gamma voltage, wherein, relation curve of the gamma curve between gamma voltage and liquid crystal display transmissivity；Signal conversion unit, source electrode driver is supplied to for the data signal of gamma voltage to be converted to the analog signal of gamma voltage, and by the analog signal of gamma voltage.Circuit of the present invention is simple, and cost is relatively low, and improves operating efficiency.
Description
Technical field
The present invention relates to display technology field, more particularly to a kind of gamma voltage generating device and method, liquid crystal display.
Background technology
Liquid crystal display has the characteristics that low-power consumption, high image quality, small volume, in light weight, therefore is favored by everybody, turns into
The main flow of display.Liquid crystal display is that liquid crystal display panel is liquid based on thin film transistor (TFT) (TFT) liquid crystal display at present
The primary clustering of crystal display, liquid crystal display panel generally comprise the colored filter substrate and tft array substrate being oppositely arranged
And it is clipped in the liquid crystal layer between colored filter substrate and tft array substrate.
The driving of liquid crystal display panel is to export gamma voltage to source electrode driver, source electrode by gamma voltage generating device to drive
Dynamic device provides data-signal to liquid crystal display according to gamma voltage and gate drivers are provided to liquid crystal display and swept
Signal is retouched, the pressure difference between different pieces of information signal voltage and public electrode voltages causes liquid crystal anglec of rotation difference to be formed
The display of the difference of brightness, i.e. liquid crystal display panel forms different GTGs.In liquid crystal display panel, gamma voltage and transmission
Relation curve between rate is referred to as gamma (Gamma) curve, and by taking 8bit liquid crystal display panels as an example, it can show 28=256
Individual GTG, corresponding 256 different gamma voltages, gamma voltage be exactly the change procedure of white to black is divided into 2 n times power
Equal portions.
For example, a kind of existing gamma voltage generating device as shown in Figure 1, can export n gamma voltage V1~Vn
To source electrode driver, so that source electrode driver exports multiple data-signals to liquid crystal display, if for example, the circuit is corresponding
2bit binary coding, you can (change procedure from white to black is divided into the 2 of 2 to export 4 gamma voltage V1~V4
Power equal portions).As shown in figure 1, gamma voltage generating device includes：N resistance R1, R2 ..., Rn, n electric capacity C1, C2 ...,
Cn.Wherein, resistance R1, R2 ..., Rn is series between voltage source VDD and ground.Voltage source VDD is used to provide DC voltage.Resistance
Node between R1 and resistance R2 is used to export gamma voltage V1.Common node between resistance R2 and resistance R3 is used to export gal
Agate voltage V2, the like, the common node between (n-1)th resistance (not shown) and resistance Rn is used to export gamma electricity
Press Vn.Electric capacity C1, C2 ..., Cn be used for filter.
The major defect of prior art is：The determination of resistance is very cumbersome in gamma voltage generating device, different liquid
LCD panel and different liquid crystal material characteristics need to be adjusted using different resistance, so needing by largely counting
Calculation and debugging efforts, greatly reduce operating efficiency.And the elements such as resistance, electric capacity are more, the cost of liquid crystal display is caused
Higher, complex circuit, the miniaturization for being unfavorable for liquid crystal display and integrated development.
The content of the invention
The present invention provides a kind of gamma voltage generating device and method, liquid crystal display, and circuit is simple, cost is relatively low.
The technical scheme is as follows：
The invention provides a kind of gamma voltage generating device, and it includes：Arithmetic unit, with arithmetic unit and source electrode driver phase
Signal conversion unit even, wherein, arithmetic unit, the gamma curve and gamma curvature pre-entered for basis, and by advance
The GTG of storage and the calculation formula of liquid crystal display transmissivity obtain the corresponding relation between GTG and gamma voltage, according to ash
Corresponding relation between rank and gamma voltage and the grey decision-making needed for the liquid crystal display prestored, obtain the number of gamma voltage
Word signal, wherein, relation curve of the gamma curve between gamma voltage and liquid crystal display transmissivity；Signal conversion unit,
It is supplied to for the data signal of gamma voltage to be converted to the analog signal of gamma voltage, and by the analog signal of gamma voltage
Source electrode driver.
In preferred embodiments of the present invention, in addition to：The input block being connected with arithmetic unit, is obtained for pre-entering
Gamma curve and gamma curvature to arithmetic unit.
In preferred embodiments of the present invention, the calculation formula of GTG and transmissivity is T=(L/M)gamma, wherein, T is liquid
Crystal display transmissivity, L are GTG, and M is GTG L maximum, and gamma is gamma curvature.
In preferred embodiments of the present invention, arithmetic unit includes：Memory cell, for storing the gamma curve pre-entered
With the grey decision-making needed for gamma curvature, the calculation formula of storage GTG and liquid crystal display transmissivity and liquid crystal display.
In preferred embodiments of the present invention, gamma curvature is set as 2.2.
In preferred embodiments of the present invention, input block is connected by I2C signal wires with arithmetic unit, signal conversion unit
For digital analog converter, arithmetic unit, signal conversion unit and source electrode driver are integrated on source driving chip.
The embodiment of the present invention additionally provides a kind of liquid crystal display, and it includes above-mentioned gamma voltage generating device and source electrode and driven
Dynamic device, gamma voltage generating device provide gamma voltage for source electrode driver.
The embodiment of the present invention additionally provides a kind of gamma voltage production method, including:Arithmetic unit is according to the gal pre-entered
Maqu line and gamma curvature, and the GTG by prestoring and the calculation formula of liquid crystal display transmissivity obtain GTG and gal
Corresponding relation between agate voltage, according to the corresponding relation between GTG and gamma voltage and the liquid crystal display prestored institute
The grey decision-making needed, obtains the data signal of gamma voltage, wherein, gamma curve be gamma voltage and liquid crystal display transmissivity it
Between relation curve；Signal conversion unit is converted to the data signal of gamma voltage the analog signal of gamma voltage, and by gal
The analog signal of agate voltage is supplied to source electrode driver.
In preferred embodiments of the present invention, obtaining the gamma curve pre-entered includes：Gamma voltage generating device pair
The source electrode driver of liquid crystal display inputs different gamma voltages, measures the transmission of liquid crystal display under different gamma voltages
Rate, to obtain gamma curve.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
By arithmetic unit according to the gamma curve and gamma curvature pre-entered, and GTG and liquid crystal by prestoring
The calculation formula of display transmissivity obtains the corresponding relation between GTG and gamma voltage, according between GTG and gamma voltage
Corresponding relation and the liquid crystal display that prestores needed for grey decision-making, obtain the data signal of gamma voltage；Signal is changed
Unit is converted to the data signal of gamma voltage the analog signal of gamma voltage, and the analog signal of gamma voltage is supplied to
Source electrode driver.The embodiment of the present invention need not be using the complicated element of resistance, electric capacity etc. in the prior art, so that gamma is electric
Pressure generation device circuit is simple, and cost is relatively low, and substantially increases operating efficiency.
Brief description of the drawings
Fig. 1 is a kind of circuit diagram of existing gamma voltage generating device；
Fig. 2 is the gamma voltage generating device main frame block diagram that first embodiment of the invention provides；
Fig. 3 is the main frame block diagram for the gamma voltage generating device that second embodiment of the invention provides；
Fig. 4 is the step flow chart for the gamma voltage production method that third embodiment of the invention provides；
Fig. 5 is the step flow chart for the gamma voltage production method that fourth embodiment of the invention provides.
Embodiment
Further to illustrate the present invention to reach the technological means and effect that predetermined goal of the invention is taken, below in conjunction with
Accompanying drawing and preferred embodiment, to according to gamma voltage generating device proposed by the present invention and method, liquid crystal display, it is specific real
Mode, structure, feature and effect are applied, is described in detail as after.
For the present invention foregoing and other technology contents, feature and effect, in the following preferable reality coordinated with reference to schema
Applying during example describes in detail to be clearly presented.By the explanation of embodiment, when predetermined mesh can be reached to the present invention
The technological means taken and effect be able to more deeply and it is specific understand, but institute's accompanying drawings are only to provide with reference to saying
It is bright to be used, not it is used for being any limitation as the present invention.
First embodiment
Fig. 2 is the main frame block diagram for the gamma voltage generating device that first embodiment of the invention provides.It refer to Fig. 2,
The gamma voltage generating device, including：Arithmetic unit 23, the signal conversion unit being connected with arithmetic unit 23 and source electrode driver 27
25。
Arithmetic unit 23, for according to the gamma curve and gamma curvature that pre-enter, and the GTG by prestoring with
The calculation formula of liquid crystal display transmissivity obtains the corresponding relation between GTG and gamma voltage, according to GTG and gamma voltage
Between corresponding relation and the grey decision-making needed for the liquid crystal display that prestores, obtain the data signal of gamma voltage, wherein,
Relation curve of the gamma curve between gamma voltage and liquid crystal display transmissivity.
Wherein, the calculation formula of GTG and transmissivity is T=(L/M)gamma, wherein, T is liquid crystal display transmissivity, and L is
GTG, M are GTG L maximum, and gamma is gamma curvature, and it can be set as 2.2.Arithmetic unit 23 is according to gamma curve (V-
T curve) and gamma curvature gamma, and pass through GTG and the calculation formula (T=(L/M) of liquid crystal display transmissivitygamma) can
To obtain the corresponding relation between GTG and gamma voltage (i.e. L-V relations).Grey decision-making needed for liquid crystal display can basis
Being actually needed for display and set, such as can take n grey decision-making L1, L2 ..., Ln, then according to GTG and gamma electricity
Corresponding relation between pressure, you can with obtain the data signal of gamma voltage (such as obtain n gamma voltage V1, V2 ...,
Vn)。
Preferably, arithmetic unit 23 can include：Memory cell 29.
Memory cell 29, for storing the gamma curve and gamma curvature that pre-enter, storage GTG and liquid crystal display
Calculation formula (the T=(L/M) of transmissivitygamma) and liquid crystal display needed for grey decision-making.Memory cell 29 can be read-only deposits
Reservoir, such as (Electrically Erasable Programmable Read-Only Memory, electrically erasable can by EEPROM
Program read-only memory).
Signal conversion unit 25, for the data signal of gamma voltage to be converted to the analog signal of gamma voltage, and will
The analog signal of gamma voltage is supplied to source electrode driver 27.So that source electrode driver 27 provides according to gamma electric voltage
To liquid crystal display, the transmissivity of liquid crystal display changes data-signal according to gamma voltage, and produces gray scale.
Signal conversion unit 25 can be digital-to-analogue (D/A) converter.
In summary, the gamma voltage generating device that the present embodiment provides, by arithmetic unit according to the gamma pre-entered
Curve and gamma curvature, and the GTG by prestoring and the calculation formula of liquid crystal display transmissivity obtain GTG and gamma
Corresponding relation between voltage, according to needed for the corresponding relation between GTG and gamma voltage and the liquid crystal display prestored
Grey decision-making, obtain the data signal of gamma voltage；The data signal of gamma voltage is converted to gamma electricity by signal conversion unit
The analog signal of pressure, and the analog signal of gamma voltage is supplied to source electrode driver.The embodiment of the present invention need not be using existing
The complicated element such as resistance, electric capacity in technology, so that gamma voltage generating device circuit is simple, cost is relatively low, and greatly
Improve operating efficiency greatly.
Second embodiment
Fig. 3 is refer to, the main frame frame of the gamma voltage generating device provided it illustrates second embodiment of the invention
Figure.Fig. 3 is improved on the basis of Fig. 2.It is similar to the device shown in Fig. 2, and its difference is, gamma voltage
Generation device, in addition to：The input block 301 being connected with arithmetic unit 23.
Input block 301, for pre-entering obtained gamma curve and gamma curvature to arithmetic unit 23, wherein gamma
Relation curve of the curve between gamma voltage and liquid crystal display transmissivity.
Wherein, gamma curvature is the electro-optic response parameter of liquid crystal display, and gamma curvature can be set as 2.2, so may be used
To obtain the optimum reelability quality for being adapted to human eye observation, in other embodiments, as long as the optimal of suitable human eye observation can be obtained
Comfort level, gamma curvature can also be set as other numerical value.Gamma curve is gamma voltage (V) and liquid crystal display transmissivity
(T) relation curve between is V-T curve.Wherein, the preparation method of V-T curve can be：Gamma voltage generating device is to liquid
The source electrode driver 27 of crystal display inputs different gamma voltages, measures the transmission of liquid crystal display under different gamma voltages
Rate, you can to obtain gamma curve, i.e. gamma voltage-transmittance graph (i.e. V-T curve), meanwhile, in order to improve computational efficiency,
V-T curve can be obtained by the way of software simulation, then input obtained V-T curve to fortune by input block 301
Device 23 is calculated, gamma curve and gamma curvature are generally inputted before liquid crystal display dispatches from the factory, once gamma curve and gamma are bent
Rate is inputted to arithmetic unit 23, and it is single that gamma voltage generating device can save input during follow-up gamma voltage produces
Member 301.
Preferably, input block 301 can be the input equipments such as keyboard, mouse, and it can pass through I2C signal wires and computing
Device 23 is connected, and so, the gamma curve and gamma curvature inputted on the inputting interface that gamma voltage generating device provides can
To be transmitted by I2C signal wires to arithmetic unit 23.
Preferably, in the present embodiment, in order to further reach miniaturization and integrated purpose, arithmetic unit 23, signal conversion
Unit 25 and source electrode driver 27 can also be integrated on source driving chip 30.
The gamma voltage generating device that the present embodiment provides, also pre-enters obtained gamma curve by input block
It is simple to operate, improve work effect so as to facilitate arithmetic unit subsequently to carry out the calculating of gamma voltage and gamma curvature is to arithmetic unit
Rate, in addition, arithmetic unit, signal conversion unit and source electrode driver can also be integrated on source driving chip, further to reach
To miniaturization and integrated purpose.
It is below the embodiment of the method for the present invention, the details of not detailed description, may be referred to above-mentioned in embodiment of the method
Corresponding device embodiment.
3rd embodiment
Fig. 4 is the step flow chart for the gamma voltage production method that third embodiment of the invention provides.Fig. 4 is refer to, this
The gamma voltage production method of embodiment, comprises the following steps 401-403.
Step 401, arithmetic unit is according to the gamma curve and gamma curvature pre-entered, and the GTG by prestoring with
The calculation formula of liquid crystal display transmissivity obtains the corresponding relation between GTG and gamma voltage, according to GTG and gamma voltage
Between corresponding relation and the grey decision-making needed for the liquid crystal display that prestores, obtain the data signal of gamma voltage, wherein,
Relation curve of the gamma curve between gamma voltage and liquid crystal display transmissivity.
Wherein, the calculation formula of GTG and transmissivity is T=(L/M)gamma, wherein, T is liquid crystal display transmissivity, and L is
GTG, M are GTG L maximum, and gamma is gamma curvature.
Step 403, signal conversion unit is converted to the data signal of gamma voltage the analog signal of gamma voltage, and will
The analog signal of gamma voltage is supplied to source electrode driver.
In summary, gamma voltage production method provided in an embodiment of the present invention, by arithmetic unit according to pre-entering
Gamma curve and gamma curvature, and the calculation formula of the GTG by prestoring and liquid crystal display transmissivity obtain GTG with
Corresponding relation between gamma voltage, according to the corresponding relation between GTG and gamma voltage and the liquid crystal display prestored
Required grey decision-making, obtain the data signal of gamma voltage；The data signal of gamma voltage is converted to gal by signal conversion unit
The analog signal of agate voltage, and the analog signal of gamma voltage is supplied to source electrode driver.The embodiment of the present invention need not use
The complicated element such as resistance, electric capacity in the prior art, so that gamma voltage generating device circuit is simple, cost is relatively low, and
And substantially increase operating efficiency.
Fourth embodiment
Fig. 5 is the step flow chart for the gamma voltage production method that fourth embodiment of the invention provides.Fig. 5 is in Fig. 4
On the basis of improve.Fig. 5 and Fig. 4 difference is that Fig. 5 can also include step 500.Fig. 5 is refer to, the present invention is implemented
The gamma voltage production method of example, can also include the steps of 401-401 and 500：
Wherein step 401-403 is identical with Fig. 4, will not be repeated here.
Step 500, input block pre-enters obtained gamma curve and gamma curvature to arithmetic unit.
Wherein, obtaining the gamma curve pre-entered includes：
Gamma voltage generating device inputs different gamma voltages to the source electrode driver of liquid crystal display, measures different gals
The transmissivity of liquid crystal display under agate voltage, to obtain gamma curve.
In summary, gamma voltage production method provided in an embodiment of the present invention, also pre-enters institute by input block
The gamma curve and gamma curvature of acquisition are to arithmetic unit, so as to facilitate arithmetic unit subsequently to carry out the calculating of gamma voltage, operation letter
List, improve operating efficiency.
Present invention also offers a kind of liquid crystal display, including source electrode driver and above-mentioned gamma voltage generating device, gal
Agate device for generating voltage provides gamma voltage for source electrode driver.This liquid crystal display can be LCD TV, DPF, hand
Any product or part with display function such as machine or tablet personal computer.
The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, as long as being the technical spirit pair according to the present invention without departing from technical solution of the present invention content
Any simple modification, equivalent change and modification that above example is made, in the range of still falling within technical solution of the present invention.
Claims (10)
1. a kind of gamma voltage generating device, it is characterised in that it includes：Arithmetic unit and the arithmetic unit and source electrode driver
Connected signal conversion unit, wherein,
The arithmetic unit, the gamma curve and gamma curvature pre-entered for basis, and GTG and liquid by prestoring
The calculation formula of crystal display transmissivity obtains the corresponding relation between GTG and gamma voltage, according to GTG and gamma voltage it
Between corresponding relation and the grey decision-making needed for the liquid crystal display that prestores, obtain the data signal of gamma voltage, wherein, institute
Relation curve of the gamma curve between gamma voltage and liquid crystal display transmissivity is stated, the gamma voltage generating device is to liquid
The source electrode driver of crystal display inputs different gamma voltages, measures the transmissivity of liquid crystal display under different gamma voltages,
To be previously obtained gamma curve；
The signal conversion unit, the simulation for the data signal of the gamma voltage to be converted to the gamma voltage are believed
Number, and the analog signal of the gamma voltage is supplied to the source electrode driver.
2. gamma voltage generating device according to claim 1, it is characterised in that also include：It is connected with the arithmetic unit
Input block, for pre-entering the gamma curve obtained and the gamma curvature to the arithmetic unit.
3. gamma voltage generating device according to claim 1, it is characterised in that the calculation formula of GTG and transmissivity is
T=(L/M)gamma, wherein, T is liquid crystal display transmissivity, and L is GTG, and M is GTG L maximum, and gamma is that gamma is bent
Rate.
4. gamma voltage generating device according to claim 1, it is characterised in that the arithmetic unit includes：Memory cell,
For storing the gamma curve pre-entered and gamma curvature, storage GTG and the calculation formula and liquid of liquid crystal display transmissivity
Grey decision-making needed for crystal display.
5. according to the gamma voltage generating device any one of claim 1-4, it is characterised in that the gamma curvature is set
It is set to 2.2.
6. gamma voltage generating device according to claim 2, it is characterised in that the input block passes through I2C signals
Line is connected with the arithmetic unit, and the signal conversion unit is digital analog converter, the arithmetic unit, signal conversion unit and source electrode
Driver is integrated on source driving chip.
7. a kind of liquid crystal display, it is characterised in that it includes claim 1-4, the gamma voltage any one of 6 produces
Device and source electrode driver, the gamma voltage generating device provide gamma voltage for the source electrode driver.
A kind of 8. gamma voltage production method, it is characterised in that the gamma voltage production method, including：
Arithmetic unit is according to the gamma curve and gamma curvature pre-entered, and GTG and liquid crystal display by prestoring are saturating
The calculation formula for penetrating rate obtains the corresponding relation between GTG and gamma voltage, according to the corresponding pass between GTG and gamma voltage
Be and the liquid crystal display that prestores needed for grey decision-making, obtain the data signal of gamma voltage, wherein, the gamma curve
For the relation curve between gamma voltage and liquid crystal display transmissivity, source electrode of the gamma voltage generating device to liquid crystal display
Driver inputs different gamma voltages, the transmissivity of liquid crystal display under different gamma voltages is measured, to be previously obtained gamma
Curve；
Signal conversion unit is converted to the data signal of the gamma voltage analog signal of the gamma voltage, and by described in
The analog signal of gamma voltage is supplied to source electrode driver.
9. gamma voltage production method according to claim 8, it is characterised in that input block pre-enters what is obtained
The gamma curve and the gamma curvature are to the arithmetic unit.
10. gamma voltage production method according to claim 8, it is characterised in that the calculation formula of GTG and transmissivity
For T=(L/M)gamma, wherein, T is liquid crystal display transmissivity, and L is GTG, and M is GTG L maximum, and gamma is that gamma is bent
Rate.
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| CN105869581B (en) * | 2016-06-17 | 2019-07-05 | 武汉华星光电技术有限公司 | Liquid crystal display drive circuit and liquid crystal display device |
| CN106710558A (en) * | 2017-02-28 | 2017-05-24 | 深圳市华星光电技术有限公司 | Driving circuit and liquid crystal display device |
| CN107369419A (en) * | 2017-08-08 | 2017-11-21 | 昆山龙腾光电有限公司 | Liquid crystal display device and its driving method |
| CN110473492B (en) * | 2019-08-28 | 2021-01-26 | 上海灵信视觉技术股份有限公司 | Dynamic nonlinear display adjustment method, system and device for LED full-color display screen |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee after: Kunshan Longteng Au Optronics Co Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee before: Kunshan Longteng Optronics Co., Ltd. |