CN208433205U - A kind of reference voltage generating circuit, chip and liquid crystal display - Google Patents
A kind of reference voltage generating circuit, chip and liquid crystal display Download PDFInfo
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- CN208433205U CN208433205U CN201821209618.9U CN201821209618U CN208433205U CN 208433205 U CN208433205 U CN 208433205U CN 201821209618 U CN201821209618 U CN 201821209618U CN 208433205 U CN208433205 U CN 208433205U
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Abstract
It includes interface module, frequency detection module and D/A converter module that the utility model, which provides a kind of reference voltage generating circuit, chip and liquid crystal display, the reference voltage generating circuit,；The input terminal of the frequency detection module and the input terminal of the interface module are connect with the sequence controller in the liquid crystal display respectively, the output end of the frequency detection module is connect with the D/A converter module, the output end of the interface module is connect with the input terminal of the frequency detection module, and the output end of the D/A converter module is connect with the display panel in the liquid crystal display.The appearance of the problems such as image sticking caused by the utility model can effectively avoid frame rate present in available liquid crystal display and reference voltage from mismatching, improves the display effect of liquid crystal display.
Description
Technical field
The utility model relates to display technology field, in particular to a kind of reference voltage generating circuit, chip and
Liquid crystal display.
Background technique
With the development of display technology, TFT-LCD (Thin Film Transistor-Liquid Crystal
Display, Thin Film Transistor-LCD) with its absolute advantage (at low cost, image quality is good, low in energy consumption etc.) in display field
Leading position is occupied, such as can be applied to computer, television set, in mobile phone audio-visual equipment.Wherein, TFT-LCD is in normal work
Reference of the reference voltage as all output voltages is needed during making, and in the prior art, above-mentioned reference voltage is often
Be it is fixed, i.e., generated according to a fixed frame rate (such as 60Hz), cannot be with frame rate so as to cause reference voltage
Change and changes in real time, so that TFT-LCD has the following problems in use:
(1) when frame rate and reference voltage mismatch, the charging situation of the transistor in display panel array can be made
At influence, for example, will lead to transistor undercharge when current frame rate is greater than fixed frame rate, current frame rate is less than solid
When framing frequency, it will lead to transistor and be overcharged with electricity；
(2) mismatch of frame rate and reference voltage will lead to the production of the problems such as image image retention (image sticking)
It is raw, seriously affect the visual effect of display.
Utility model content
In view of this, the present invention provides a kind of reference voltage generating circuit, chip and liquid crystal display, Neng Gouyou
Effect solves the above problems.
The utility model preferred embodiment provides a kind of reference voltage generating circuit, is applied to liquid crystal display, the ginseng
Examining voltage generation circuit includes interface module, frequency detection module and D/A converter module；
The input terminal of the frequency detection module and the input terminal of the interface module are respectively and in the liquid crystal display
Sequence controller connection, the output end of the frequency detection module connect with the D/A converter module, the interface module
Output end connect with the input terminal of the frequency detection module, the output end of the D/A converter module and the liquid crystal display
Display panel connection in device；
Wherein, the interface module is for obtaining preset reference voltage value and reference frequency in the sequence controller
Value；The current frequency value of liquid crystal display of the frequency detection module for detecting the sequence controller offer, and according to
The reference voltage value, reference frequency value and current frequency value calculate current voltage value；The D/A converter module is used for institute
The current voltage value progress digital-to-analogue conversion that frequency detection module is calculated is stated to obtain current reference voltage value and be sent to described
Display panel.
In the selection of the utility model preferred embodiment, the frequency detection module includes counter, clock generator
And processor, the processor are separately connected with the counter, the clock generator and the sequence controller.
In the selection of the utility model preferred embodiment, the interface module includes times in SPI module or I2C module
It is a kind of.
In the selection of the utility model preferred embodiment, the reference voltage generating circuit further includes operation amplifier mould
Block, the both ends of the operational amplifying module are connect with the D/A converter module and the display panel respectively.
On the other hand, the utility model preferred embodiment also provides a kind of liquid crystal display, including sequence controller, display
Panel and reference voltage generating circuit, the reference voltage generating circuit include interface module, frequency detection module and digital-to-analogue
Conversion module；
The input terminal of the frequency detection module and the input terminal of the interface module connect with the sequence controller respectively
Connect, the output end of the frequency detection module is connect with the D/A converter module, the output end of the interface module with it is described
The input terminal of frequency detection module connects, and the output end of the D/A converter module is connect with the display panel.
In the selection of the utility model preferred embodiment, the frequency detection module includes counter, clock generator
And processor, the processor are separately connected with the counter, the clock generator and the sequence controller.
In the selection of the utility model preferred embodiment, the interface module includes times in SPI module or I2C module
It is a kind of.
In the selection of the utility model preferred embodiment, the voltage generation circuit further includes operational amplifying module, institute
Operational amplifying module is stated to be separately connected with the D/A converter module and the display panel.
Another aspect, the utility model preferred embodiment also provide a kind of chip, and the integrated chip has as described above
Reference voltage generating circuit.
Compared with prior art, the utility model provides a kind of reference voltage generating circuit, chip and liquid crystal display,
In, it is generated in real time by reference to voltage generation circuit with the matched reference voltage of current frame rate in display and to drive
Display panel, to effectively avoid existing in the prior art since frame rate and reference voltage mismatch caused image
The appearance of the problems such as sticking, so that optimal display effect is presented in liquid crystal display panel.Meanwhile the utility model provides
Reference voltage generating circuit structure is simple, realizes simple.
To enable the above objects, features, and advantages of the utility model to be clearer and more comprehensible, preferred embodiment is cited below particularly, and
Cooperate appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is the power supply circuit construction schematic diagram of the display panel in existing liquid crystal display.
Fig. 2 is the frame structure schematic diagram of reference voltage generating circuit provided by the embodiment of the utility model.
Fig. 3 is the frame structure schematic diagram of frequency detection module shown in Fig. 2.
Fig. 4 is the operation principle schematic diagram of the reference voltage generating circuit provided in the utility model embodiment.
Fig. 5 is another frame structure schematic diagram of reference voltage generating circuit provided by the embodiment of the utility model.
Fig. 6 is the flow diagram of reference voltage generation method provided by the embodiment of the utility model.
Fig. 7 is sub-process schematic diagram of the Fig. 6 in shown step S11.
Icon: 10- reference voltage generating circuit；11- frequency detection module；110- processor；111- counter；When 112-
Clock generator；12- interface module；13- D/A converter module；14- operational amplifying module；20- sequence controller；30- display surface
Plate.
Specific embodiment
Through inventor the study found that as shown in Figure 1, existing general TFT-LCD includes source electrode driver A, gate driving
Device B, public voltage generating circuit C and transistor array D.Wherein, transistor array D is made of several pixels E, each
Pixel is made of tri- pixel units of R, G, B, and F is the equivalent circuit of pixel unit in Fig. 1, and each pixel unit includes a picture
One pole of plain capacitor, pixel capacitance is connected with source drive, and another pole is connected with public electrode.
Wherein, it is mentioned for what is provided in above-mentioned Fig. 1 by public voltage generating circuit (power-supply controller of electric) for transistor array
When supply reference voltage, since the problems such as image sticking caused by frame rate and reference voltage mismatch occurs, this is practical
New embodiment provides a kind of reference voltage generating circuit 10, method and liquid crystal display, to generate electricity using the reference voltage
The reference voltage value that road 10 generates, which substitutes, needs to be generated reference voltage by public voltage generating circuit for crystalline substance in existing TFT-LCD
The mode of body pipe powering arrays, can effectively solve the problem that the above problem.
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is a part of the embodiment of the utility model, instead of all the embodiments.Usually retouched in attached drawing here
The component of the utility model embodiment stated and shown can be arranged and be designed with a variety of different configurations.
Therefore, requirement is not intended to limit to the detailed description of the embodiments of the present invention provided in the accompanying drawings below
The scope of the utility model of protection, but it is merely representative of the selected embodiment of the utility model.Based in the utility model
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the range of the utility model protection.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.In the utility model
In description, " first, second, third, fourth etc. is only used for distinguishing description term, and should not be understood as only or imply relatively heavy
The property wanted.
In the description of the present invention, unless otherwise clearly defined and limited, term " setting ", " connected ", " company
Connect " it shall be understood in a broad sense, for example, it may be being fixedly connected, it may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, it can understand that above-mentioned term is practical new at this with concrete condition
Concrete meaning in type.
As shown in Fig. 2, being the structural schematic diagram of reference voltage generating circuit 10 provided by the embodiment of the utility model, the ginseng
Examining voltage generation circuit 10 includes frequency detection module 11, interface module 12 and D/A converter module 13；The frequency detecting mould
The input terminal of block 11 and the input terminal of the interface module 12 are connect with the sequence controller 20 in the liquid crystal display respectively,
The output end of the frequency detection module 11 is connect with the D/A converter module 13, the output end of the interface module 12 and institute
State the input terminal connection of frequency detection module 11, the output end of the D/A converter module 13 and showing in the liquid crystal display
Show that panel 30 connects.
Wherein, the interface module 12 is for obtaining preset reference voltage value and reference frequency in the sequence controller 20
Rate value；The frequency detection module 11 is used to detect the current frequency value for the liquid crystal display that the sequence controller 20 provides,
And current voltage value is calculated according to the reference voltage value, reference frequency value and current frequency value；The D/A converter module 13
Current voltage value for the frequency detection module 11 to be calculated carries out digital-to-analogue conversion and obtains current reference voltage value simultaneously
It is sent to the display panel 30.
By the design and description to above-mentioned reference voltage generating circuit 10, the utility model embodiment can be according to existing
Liquid crystal display in sequence controller 20 in level signal calculate with the matched reference voltage of current frame rate, and provide
To the transistor array in the display panel 30 in liquid crystal display, to realize the automatic adjustment and reference to reference voltage
The variation of voltage maxima efficiently solves the problems, such as that existing reference voltage is unmatched with frame rate, avoids Image
The generation of the problems such as Sticking, and reach best display effect.
In detail, the interface module 12 is used to obtain the preset reference voltage value and reference frequency of fixed frame rate
Value.When actual implementation, the interface module 12 can within be set to the sequence controller 20 in, for reading the sequence controller
The numerical value prestored in register in 20 is to realize the acquisition to predetermined reference voltage value and reference frequency value；The interface module
12 are also possible to independently of the sequence controller 20, and carry out data interaction, and the side for passing through data configuration with external equipment
Formula obtains the reference voltage and reference frequency etc. of anchor-frame predetermined frequency, and the present embodiment is herein with no restrictions.
Optionally, the interface module 12 can be but not limited to SPI (Serial Peripheral Interface (SPI), Serial Peripheral
Interface) module or I2C (internal integrated circuit, Inter-Integrated Circuit) bus module.
Further, as shown in figure 3, in one embodiment, the frequency detection module 11 may include processor 110
With counter 111, clock generator 112, the processor 110 and the counter 111, the clock generator 112 and institute
Sequence controller 20 is stated to be separately connected.
In detail, please refer to Fig. 4, it is assumed that STV be from sequence controller 20 level signal (wherein, F1,
F2 ... respectively represents a level period), then when the processor 110 detects the height electricity in a STV level signal
When flat arrival, the processor 110 transmission starts counting instruction to the counter 111, and the counter 111 is opened according to described
Begin to count the number of pulses (such as described counter 111 from 0 starts counting) generated in clock generator 112 described in Instruction Statistics,
When the processor 110 detects that STV becomes low level, which, which sends, stops counting instruction to the counting
Device 111 is so that the counter 111 stops counting, and count results are sent to the processor 110, here, the processing
The count results are executed as current frequency value according to the reference voltage value, the reference frequency value and are worked as by device 110
Preceding frequency values calculate the step of current voltage value (such as V1, V2, V3 ...).In the present embodiment, it is assumed that CnewFor current frequency value,
CβReference frequency value, VαFor reference voltage value, then current reference voltage VnewCalculation formula beThen,
When the processor 110 detects the STV level signal arrival of next frame, the processor 110, counter 111 and clock
Generator 112 repeats abovementioned steps so that the reference voltage value of present frame is calculated.
It should be noted herein that in above-mentioned calculating, if current frame rate is faster than previous frame rate, what operation generated
The current reference voltage value of present frame should be greater than the reference voltage value of former frame；If current frame rate is slower than previous frame rate,
The current reference voltage value for the present frame that then operation generates should be less than the reference voltage value of former frame, so that the ginseng being calculated
It examines voltage value to match with current frame rate, and then realizes the purpose that reference voltage adjusts in real time according to frame rate, guarantee each
The reference voltage value that frame is exported is all satisfied the charging requirement of the transistor array in display panel 30, avoids image
The generation of sticking phenomenon reaches optimal visual effect.
Optionally, the present embodiment such as concrete model about the processor 110, counter 111 and clock generator 112
Herein with no restrictions, for example, the processor 110 can be a kind of IC chip, the processing capacity with signal, at this
Reason device 110 is also possible to general processor, digital signal processor (DSP, Digital Singnal Processor), dedicated
Integrated circuit (ASIC, Application Specific Integrated Circuit), field programmable gate array (FPGA,
Field-Programmable Gate Array) either other programmable logic device, discrete gate or transistor logic device
Part, discrete hardware components.
The D/A converter module 13 is for realizing the digital-to-analogue conversion to input signal, and in the present embodiment, the digital-to-analogue turns
The model etc. of mold changing block 13 can carry out flexible design according to actual needs, and such as D/A converter module 13 can be selected but not
It is limited to AD7801BRZ digital analog converter, TLC7226CDWR digital analog converter etc..
Further, due to being provided with multiple display units on display panel 30, in order to enable after digital-to-analogue conversion
Driving voltage when working of current reference voltage and display panel 30 more match, please refer to Fig. 5, the utility model is given
Reference voltage generating circuit 10 out may also include operational amplifying module 14, the both ends of the operational amplifying module 14 respectively with institute
It states D/A converter module 13 and the display panel 30 connects.Wherein, by D/A converter module 13 and display panel 30 it
Between increase operational amplifying module 14, can be improved the driving capability of the current reference voltage, that is, it is raw to enhance the reference voltage
At the driving capability of circuit 10, so that the devices such as pixel capacitance in display panel 30 realize faster charge and discharge, and then improve
The display performance of display panel 30 in liquid crystal display.
Optionally, the operational amplifying module 14 can be but not limited to TDA2030 operational amplifier, LM613IWM operation
Amplifier etc., the present embodiment is herein with no restrictions.
Further, based on the design and description to above-mentioned reference voltage generating circuit 10, as shown in fig. 6, this is practical new
Type embodiment also provides a kind of reference voltage generation method applied to above-mentioned reference voltage generating circuit 10, specific as follows.
Step S10, the reference voltage value and reference frequency value of the acquisition liquid crystal display of interface module 12 are simultaneously transferred to described
Frequency detection module 11；
Step S11, the current frequency that the sequence controller 20 in 11 detection LCD monitor of frequency detection module provides
Rate value, and current voltage value is calculated according to the reference voltage value, the reference frequency value and current frequency value and is sent to
D/A converter module 13；
Step S12, the D/A converter module 13 carry out digital-to-analogue conversion to the current voltage value to obtain current reference
Voltage value is simultaneously sent in the liquid crystal display display panel 30 to provide driving voltage for the display panel 30.
Wherein, the frequency detection module 11 includes counter 111, clock generator 112 and processor 110, such as Fig. 7 institute
Show, the sequence controller 20 in 11 detection LCD monitor of the frequency detection module in above-mentioned steps S11 provides current
The step of frequency values, can be realized by following step S110- step S112, specific as follows:
Step S110, the level signal of the sequence controller 20 in 110 detection LCD monitor of processor, and pre-
Instruction is started counting to the counter 111 if sending when level arrives；
Step S111, the counter 111 are generated according to described start counting in clock generator 112 described in Instruction Statistics
Number of pulses, stop counting when receiving the stopping that the processor 110 is sent and counting instruction, and count results are sent out
Give the processor 110；
Step S112, the processor 110 execute the count results as current frequency value according to the reference
Voltage value, the reference frequency value and current frequency value calculate the step of current voltage value.
Wherein, the predetermined level in step S110 can be high level or low level etc., and the present embodiment is herein with no restrictions.
In addition, the current reference voltage V in above-mentioned stepsnewCalculation formula beWherein, CnewFor current frequency
Value, CβReference frequency value, VαFor reference voltage value.
Further, in order to increase the driving capability of the reference voltage generating circuit 10, display panel is further increased
30 display effect, the reference voltage generation method that the utility model provides may also include that
The current reference voltage value that the operational amplifying module 14 exports the D/A converter module 13 handled with
Enhance the driving capability of the current reference voltage, and using treated current reference voltage value as in the liquid crystal display
The input voltage of display panel 30.
It is understood that the detailed description about above-mentioned steps S10- step S14 can refer to it is aforementioned raw to reference voltage
At the detailed description of circuit 10, details are not described herein for this example.
Further, the utility model gives a kind of liquid crystal display, the liquid crystal display include sequence controller 20,
Display panel 30 and reference voltage generating circuit 10, the reference voltage generating circuit 10 include frequency detection module 11, connect
Mouth mold block 12 and D/A converter module 13；
The input terminal of the frequency detection module 11 and the input terminal of the interface module 12 respectively with the timing control
Device 20 connects, and the output end of the frequency detection module 11 is connect with the D/A converter module 13, the interface module 12
Output end is connect with the input terminal of the frequency detection module 11, the output end and the display surface of the D/A converter module 13
Plate 30 connects.
Wherein, the sequence controller 20 is used to handle the clock signal needed for control panel, and export control signal with
Display panel 30 etc. is directly driven, details are not described herein for the present embodiment.
Further, according to actual needs, the voltage generation circuit includes that may also include operational amplifying module 14, described
Operational amplifying module 14 is separately connected with the D/A converter module 13 and the display panel 30.
The liquid crystal display provided in the present embodiment can adjust the number of reference voltage in real time according to the variation of frame rate
The appearance for the problems such as being worth, avoiding image sticking, so that optimal display effect is presented in liquid crystal display.Wherein,
It is understood that the reference voltage generating circuit 10 in the liquid crystal display has skill identical with reference voltage above-mentioned
Art feature, can be aforementioned with reference pair accordingly, with respect to the detailed description of the reference voltage generating circuit 10 in the liquid crystal display
Reference voltage generating circuit 10 description, details are not described herein for the present embodiment.
Further, the utility model implementation also provides a kind of chip, and the integrated chip has above-mentioned reference voltage raw
At circuit 10, wherein since the integrated chip has the reference voltage generating circuit 10, have with described with reference to electricity
The identical technical characteristic of generative circuit 10 is pressed, please refers to the explanation to the reference voltage generating circuit 10, herein no longer
It repeats one by one.In addition, the chip can be applied but is not limited in liquid crystal display.
In conclusion the utility model provides a kind of reference voltage generating circuit 10, chip and liquid crystal display, wherein
It is generated in real time with the matched reference voltage of current frame rate in display and to drive by reference to voltage generation circuit 10
Display panel 30, to effectively avoid existing in the prior art since frame rate and reference voltage mismatch caused image
The appearance of the problems such as sticking, so that optimal display effect is presented in liquid crystal display.Meanwhile the ginseng that the utility model provides
It is simple to examine 10 structure of voltage generation circuit, realizes simple.
Obviously, those skilled in the art should be understood that the function of above-mentioned the utility model embodiment can be with general
Computing device realize that they can be concentrated on a single computing device, or be distributed in multiple computing devices and formed
Network on, optionally, the existing program code or algorithm that they can be can be performed with computing device be realized, it is thus possible to
It is stored in storage device and is performed by computing device, or they are fabricated to each integrated circuit modules,
Or single integrated circuit module is maked multiple modules or steps in them to realize.In this way, the function of the utility model
It is able to achieve and is not limited to any specific hardware and software combination.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (9)
1. a kind of reference voltage generating circuit is applied to liquid crystal display, which is characterized in that the reference voltage generating circuit packet
Include interface module, frequency detection module and D/A converter module；
The input terminal of the frequency detection module and the input terminal of the interface module respectively in the liquid crystal display when
Sequence controller connection, the output end of the frequency detection module connect with the D/A converter module, the interface module it is defeated
Outlet is connect with the input terminal of the frequency detection module, in the output end of the D/A converter module and the liquid crystal display
Display panel connection；
Wherein, the interface module is for obtaining preset reference voltage value and reference frequency value in the sequence controller；Institute
Frequency detection module is stated for detecting the current frequency value for the liquid crystal display that the sequence controller provides, and according to the ginseng
It examines voltage value, reference frequency value and current frequency value and calculates current voltage value；The D/A converter module is used for the frequency
The current voltage value that detection module is calculated carries out digital-to-analogue conversion and obtains current reference voltage value and be sent to the display surface
Plate.
2. reference voltage generating circuit according to claim 1, which is characterized in that the frequency detection module includes counting
Device, clock generator and processor, the processor and the counter, the clock generator and the sequence controller point
It does not connect.
3. reference voltage generating circuit according to claim 1, which is characterized in that the interface module includes SPI module
Or any one of I2C module.
4. reference voltage generating circuit according to claim 1, which is characterized in that the reference voltage generating circuit also wraps
Operational amplifying module is included, the both ends of the operational amplifying module connect with the D/A converter module and the display panel respectively
It connects.
5. a kind of liquid crystal display, which is characterized in that including sequence controller, display panel and reference voltage generating circuit,
The reference voltage generating circuit includes interface module, frequency detection module and D/A converter module；
The input terminal of the frequency detection module and the input terminal of the interface module are connect with the sequence controller respectively, institute
The output end for stating frequency detection module is connect with the D/A converter module, and the output end of the interface module and the frequency are examined
The input terminal connection of module is surveyed, the output end of the D/A converter module is connect with the display panel.
6. liquid crystal display according to claim 5, which is characterized in that the frequency detection module include counter, when
Clock generator and processor, the processor connect respectively with the counter, the clock generator and the sequence controller
It connects.
7. liquid crystal display according to claim 5, which is characterized in that the interface module includes SPI module or I2C mould
Any one of block.
8. liquid crystal display according to claim 5, which is characterized in that the voltage generation circuit further includes operation amplifier
Module, the operational amplifying module are separately connected with the D/A converter module and the display panel.
9. a kind of chip, which is characterized in that the integrated chip is raw just like reference voltage of any of claims 1-4
At circuit.
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| CN201821209618.9U CN208433205U (en) | 2018-07-27 | 2018-07-27 | A kind of reference voltage generating circuit, chip and liquid crystal display |
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| CN201821209618.9U CN208433205U (en) | 2018-07-27 | 2018-07-27 | A kind of reference voltage generating circuit, chip and liquid crystal display |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108648717A (en) * | 2018-07-27 | 2018-10-12 | 北京集创北方科技股份有限公司 | A kind of reference voltage generating circuit, reference voltage generation method, chip and liquid crystal display |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108648717A (en) * | 2018-07-27 | 2018-10-12 | 北京集创北方科技股份有限公司 | A kind of reference voltage generating circuit, reference voltage generation method, chip and liquid crystal display |
| CN108648717B (en) * | 2018-07-27 | 2024-02-02 | 北京集创北方科技股份有限公司 | Reference voltage generation circuit, reference voltage generation method, chip and liquid crystal display |
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