CN108091313B - Driving voltage generation method, source electrode driving circuit, array substrate and display device - Google Patents
Driving voltage generation method, source electrode driving circuit, array substrate and display device Download PDFInfo
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- CN108091313B CN108091313B CN201810044962.5A CN201810044962A CN108091313B CN 108091313 B CN108091313 B CN 108091313B CN 201810044962 A CN201810044962 A CN 201810044962A CN 108091313 B CN108091313 B CN 108091313B
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000000758 substrate Substances 0.000 title claims description 13
- 239000004973 liquid crystal related substance Substances 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 230000007704 transition Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 101100283410 Schizosaccharomyces pombe (strain 972 / ATCC 24843) gma12 gene Proteins 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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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
- G09G2230/00—Details of flat display driving waveforms
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention discloses a driving voltage generation method, which comprises the following steps: dividing the drive waveforms into at least 2 groups of sub-drive waveforms according to the characteristics of the drive waveforms; determining an end point of the sub-drive waveform as a reference voltage; other reference voltages are determined based on the characteristics of the sub-drive waveforms, the required number of reference voltages, and the determined reference voltages.
Description
Technical Field
The invention relates to the technical field of display, in particular to a driving voltage generation method, a source electrode driving circuit, an array substrate and a display device.
Background
As display technologies, especially liquid crystal display devices, have been developed and matured, the technologies have been developed more and more. The driving of the liquid crystal display device includes gate driving and source driving. The source driving usually includes processing binary code data signals through a digital-to-analog conversion circuit, and selecting corresponding reference voltages (also called gamma reference voltages) to generate corresponding gray scale voltages through voltage division by series resistors.
However, the inventors of the present invention have found that the prior art has at least the following problems in carrying out the present invention:
in the prior art, the number of reference voltages is input after being determined in advance, so that wiring must be performed in the driving circuit according to the number of input reference voltages. The larger the number of reference voltages, the finer the gray scale voltage to be generated, but the higher the cost.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a driving voltage generating method, a source driving circuit, an array substrate and a display device, which can simplify circuit layout.
In view of the above object, a first aspect of an embodiment of the present invention provides a driving voltage generating method, including:
dividing the drive waveforms into at least 2 groups of sub-drive waveforms according to the characteristics of the drive waveforms;
determining an end point of the sub-drive waveform as a reference voltage;
other reference voltages are determined based on the characteristics of the sub-drive waveforms, the required number of reference voltages, and the determined reference voltages.
Optionally, the driving waveforms are divided into 3 groups of sub-driving waveforms, which specifically include: high voltage segment sub-drive waveforms, medium voltage segment sub-drive waveforms, low voltage segment sub-drive waveforms.
Optionally, determining an end point of the sub-driving waveform as a reference voltage includes:
and determining the endpoints of the high-voltage segment sub-driving waveform, the medium-voltage segment sub-driving waveform and the low-voltage segment sub-driving waveform as reference voltages.
Optionally, determining other reference voltages according to the characteristics of the sub-driving waveforms, the required number of reference voltages, and the determined reference voltages, includes:
determining the slope of each sub-driving waveform according to the respective end points of the high-voltage segment sub-driving waveform, the medium-voltage segment sub-driving waveform and the low-voltage segment sub-driving waveform;
other reference voltages are determined by interpolation based on the slope of each sub-drive waveform.
Optionally, the required number of the reference voltages is 18;
the endpoints of the high-voltage segment sub-drive waveform are determined as a first reference voltage, a fourth reference voltage, a fifteenth reference voltage, and an eighteenth reference voltage;
the endpoints of the mid-voltage segment sub-drive waveform are determined as a fourth reference voltage, a seventh reference voltage, a twelfth reference voltage, and a fifteenth reference voltage;
the endpoints of the low-voltage segment sub-drive waveform are determined as a seventh reference voltage, a ninth reference voltage, a tenth reference voltage, and a twelfth reference voltage.
Optionally, the required number of reference voltages is 10, 14, 18 or 22.
In a second aspect of the embodiments of the present invention, a source driving circuit is provided, in which a reference voltage is determined by using the driving voltage generating method as described in any one of the preceding paragraphs.
According to a third aspect of the embodiments of the present invention, there is provided an array substrate, including the source driving circuit as described above.
In a fourth aspect of the embodiments of the present invention, there is provided a display device, including the array substrate as described above.
As can be seen from the foregoing, in the driving voltage generating method, the source driving circuit, the array substrate and the display device provided in the embodiments of the present invention, different sub-driving waveforms are divided according to characteristics of the driving waveforms, and further, a part of reference voltages are determined according to the sub-driving waveforms, and finally, characteristics of the sub-driving waveforms, a required number of the reference voltages and the determined reference voltages are output to the source driving chip, so that other reference voltages can be determined according to the characteristics of the sub-driving waveforms, the required number of the reference voltages and the determined reference voltages, thereby obtaining all the reference voltages; therefore, the number of the reference voltages input in the source driving chip is greatly reduced compared with the number of the reference voltages required to be input in the prior art, so that circuit wiring is reduced, and cost is saved.
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Fig. 1 is a schematic flow chart of a driving voltage generating method according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a driving voltage generating method according to another embodiment of the present invention;
fig. 3 is a schematic diagram of a liquid crystal driving waveform in an embodiment of the driving voltage generation method provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
A first aspect of embodiments of the present invention proposes an embodiment of a driving voltage generation method capable of simplifying circuit wiring. Fig. 1 is a schematic flow chart of a driving voltage generating method according to an embodiment of the present invention.
The driving voltage generation method includes:
step 101: dividing the drive waveforms into at least 2 groups of sub-drive waveforms according to the characteristics of the drive waveforms; the drive waveform is generally a gray scale voltage curve obtained based on the electro-optical characteristics of the liquid crystal.
Here, the driving waveform is divided into sub-driving waveforms, and the division may be performed according to curve characteristics of different sections of the driving waveform. For example, if a certain segment of driving waveform substantially satisfies the characteristic of exponential curve, such a segment of driving waveform may be divided into 1 sub-driving waveform (which may be referred to as a), and since the driving waveform of the liquid crystal has a substantially symmetrical characteristic, another segment of driving waveform symmetrical to the above-mentioned divided sub-driving waveform may also be used as a sub-driving waveform (which may be referred to as B), so that the two segments of sub-driving waveforms may be divided into 1 group of sub-driving waveforms (i.e., a and B are a group). Similarly, if a certain segment of driving waveforms substantially satisfies the linear characteristic, the segment of driving waveforms may be divided into 1 sub-driving waveform (which may be referred to as C), and similarly, another segment symmetrical to the segment of driving waveforms may be divided into sub-driving waveforms (which may be referred to as D), so that the two segments of sub-driving waveforms may be divided into 1 sub-driving waveforms (i.e., C and D are a group).
Step 102: determining an end point of the sub-drive waveform as a reference voltage;
here, the end points of the sub-drive waveforms that have been divided can be directly determined as the reference voltages; optionally, in order to ensure that the plurality of finally obtained reference voltages meet more accurate requirements, the determined end points may be appropriately corrected.
Step 103: determining other reference voltages according to the characteristics of the sub-drive waveforms, the required number of reference voltages and the determined reference voltages; here, after the characteristics of the sub driving waveforms, the required number of reference voltages, and the determined reference voltages are obtained, the characteristics of the sub driving waveforms, the required number of reference voltages, and the determined reference voltages are output to a Source Driver IC (Source Driver IC), and thus other reference voltages are determined through calculation by the Source Driver IC.
It has been explained in the foregoing that the division of the sub-drive waveforms is divided according to the curve characteristic or the linear characteristic thereof. Since the determined reference voltages are the end points of each segment of the sub-drive waveform, that is, the determined number of reference voltages is insufficient. Therefore, the characteristics of the sub-driving waveforms, the required number of reference voltages and the determined reference voltages are output, so that a Source Driver IC (Source Driver IC) can know which determined reference voltages have missing reference voltages therebetween according to the required number of reference voltages and the determined reference voltages, and further calculate the missing reference voltages according to the characteristics of the sub-driving waveforms.
It can be seen from the foregoing embodiments that, in the driving voltage generation method provided in the embodiments of the present invention, different sub-driving waveforms are divided according to characteristics of the driving waveforms, and further, a part of reference voltages are determined according to the sub-driving waveforms, and finally, characteristics of the sub-driving waveforms, a required number of the reference voltages, and a determined reference voltage are output to the source driver chip, so that it can determine other reference voltages according to the characteristics of the sub-driving waveforms, the required number of the reference voltages, and the determined reference voltage, thereby obtaining all the reference voltages; therefore, the number of the reference voltages input in the source driving chip is greatly reduced compared with the number of the reference voltages required to be input in the prior art, so that circuit wiring is reduced, and cost is saved.
The embodiment of the invention also provides another embodiment of the driving voltage generation method, which can simplify circuit wiring. Fig. 2 is a schematic flow chart of a driving voltage generating method according to another embodiment of the present invention.
The driving voltage generation method includes:
step 201: according to the driving waveform characteristics of the liquid crystal (i.e. the liquid crystal to voltage conversion characteristics, as shown in fig. 3), the driving waveforms are divided into 3 groups of sub-driving waveforms, as shown in fig. 3, which specifically includes: high voltage segment sub-drive waveforms (i.e., the start of the white point voltage to gray scale voltage sharp transition, including segments GMA15-18 and GMA 1-4), medium voltage segment sub-drive waveforms (i.e., the start to end of the gray scale voltage sharp transition, including segments GMA12-15 and GMA 4-7), and low voltage segment sub-drive waveforms (i.e., the end of the gray scale voltage sharp transition to black point voltage, including segments GMA10-12 and GMA 7-9).
Step 202: and determining the endpoints of the high-voltage segment sub-driving waveform, the medium-voltage segment sub-driving waveform and the low-voltage segment sub-driving waveform as reference voltages.
Optionally, the required number of the reference voltages is 18;
the endpoints of the high-voltage segment sub-drive waveform are determined as a first reference voltage GMA1, a fourth reference voltage GMA4, a fifteenth reference voltage GMA15, and an eighteenth reference voltage GMA 18;
the endpoints of the mid-voltage segment sub-drive waveform are determined to be a fourth reference voltage GMA4, a seventh reference voltage GMA7, a twelfth reference voltage GMA12, and a fifteenth reference voltage GMA 15;
the end points of the low-voltage segment sub-drive waveform are determined as a seventh reference voltage GMA7, a ninth reference voltage GMA9, a tenth reference voltage GMA10, and a twelfth reference voltage GMA 12.
Step 203: determining the slope of each sub-driving waveform according to the respective end points of the high-voltage segment sub-driving waveform, the medium-voltage segment sub-driving waveform and the low-voltage segment sub-driving waveform;
the slope of each sub-drive waveform is determined according to the respective end points of the high-voltage segment sub-drive waveform, the medium-voltage segment sub-drive waveform and the low-voltage segment sub-drive waveform; specifically, referring to fig. 3, wherein the slopes of the high-voltage segment sub-drive waveforms include slope 6 of the GMA15-18 segment and slope 1 of the GMA1-4 segment, the slopes of the medium-voltage segment sub-drive waveforms include slope 5 of the GMA12-15 segment and slope 2 of the GMA4-7 segment, and the slopes of the low-voltage segment sub-drive waveforms include slope 4 of the GMA10-12 segment and slope 3 of the GMA7-9 segment. Here, by fitting each sub-drive waveform to a straight line, the subsequent calculation is made simpler and faster.
Step 204: determining other reference voltages by adopting an interpolation method according to the slope of each sub-driving waveform; namely, a second reference voltage GMA2, a third reference voltage GMA3, a fifth reference voltage GMA5, a sixth reference voltage GMA6, an eighth reference voltage GMA8, an eleventh reference voltage GMA11, a thirteenth reference voltage GMA13, a fourteenth reference voltage GMA14, a sixteenth reference voltage GMA16, and a seventeenth reference voltage GMA 17.
As can be seen from the foregoing embodiments, in the driving voltage generation method provided in the embodiments of the present invention, the driving characteristic curve of the liquid crystal is simplified into 3 segments, the end point of each segment is used as a reference voltage, and the subsequent Source Driver IC (Source Driver IC) calculates the rest of the reference voltages by using an interpolation method according to the slope, so as to obtain all the reference voltages; therefore, 18 reference voltage supplies which are given by the external requirement can be changed into only 8 reference voltage supplies, so that the number of the input voltage supplies can be optimized, the circuit wiring is reduced, and the cost is saved.
It can be seen that through the design of the method for automatically generating the driving voltage, after part of the reference voltage power supply of the Source driver IC is input into the Source driver IC, other reference voltages can be calculated, and after the calculation is completed, the other reference voltages are sent to a DAC (digital-to-analog conversion module) of an output OP (operational amplification module) of the Source driver IC for voltage correction. The reference voltage supply is a calculated stable voltage value within the source driver IC that can be adjusted via external settings.
Optionally, the required number of the reference voltages may also be 10, 14 or 22 according to different requirements. When the required number of the reference voltages is not 18 in the foregoing embodiment, a similar driving voltage generation method can be obtained according to the method concept in the foregoing embodiment, and is not described herein again.
It should be noted that, in the foregoing embodiment, when the driving waveform is divided, a symmetric division manner is adopted, and it should be understood that, in order to make the driving voltage more accurate, more detailed division and fitting may be performed according to the characteristics of each segment of the waveform, and therefore, the protection scope of the present invention should not be limited only to the foregoing embodiment.
In a second aspect of the embodiments of the present invention, an embodiment of a source driving circuit is provided, which can simplify circuit wiring.
The source driving circuit determines the reference voltage by adopting any embodiment of the driving voltage generation method.
As can be seen from the foregoing, the source driving circuit provided in the embodiment of the present invention divides different sub-driving waveforms according to characteristics of the driving waveforms, determines a part of reference voltages according to the sub-driving waveforms, and finally outputs the characteristics of the sub-driving waveforms, the required number of reference voltages, and the determined reference voltages to the source driving chip, so that it can determine other reference voltages according to the characteristics of the sub-driving waveforms, the required number of reference voltages, and the determined reference voltages, thereby obtaining all reference voltages; therefore, the number of the reference voltages input in the source driving chip is greatly reduced compared with the number of the reference voltages required to be input in the prior art, so that circuit wiring is reduced, and cost is saved.
In a third aspect of the embodiments of the present invention, an embodiment of an array substrate is provided, which can simplify circuit layout.
The array substrate comprises the source electrode driving circuit.
As can be seen from the foregoing, according to the array substrate provided by the embodiment of the present invention, different sub-driving waveforms are divided according to characteristics of driving waveforms, and further, a part of reference voltages are determined according to the sub-driving waveforms, and finally, characteristics of the sub-driving waveforms, a required number of the reference voltages, and the determined reference voltages are output to the source driver chip, so that it can determine other reference voltages according to the characteristics of the sub-driving waveforms, the required number of the reference voltages, and the determined reference voltages, thereby obtaining all the reference voltages; therefore, the number of the reference voltages input in the source driving chip is greatly reduced compared with the number of the reference voltages required to be input in the prior art, so that circuit wiring is reduced, and cost is saved.
A fourth aspect of embodiments of the present invention is directed to an embodiment of a display device, which can simplify circuit wiring.
The display device comprises the array substrate.
The display device in this embodiment may be: any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator and the like.
As can be seen from the foregoing, the display device provided in the embodiment of the present invention divides different sub-driving waveforms according to the characteristics of the driving waveforms, determines a part of reference voltages according to the sub-driving waveforms, and finally outputs the characteristics of the sub-driving waveforms, the required number of reference voltages, and the determined reference voltages to the source driver chip, so that it can determine other reference voltages according to the characteristics of the sub-driving waveforms, the required number of reference voltages, and the determined reference voltages, thereby obtaining all the reference voltages; therefore, the number of the reference voltages input in the source driving chip is greatly reduced compared with the number of the reference voltages required to be input in the prior art, so that circuit wiring is reduced, and cost is saved.
Those of ordinary skill in the art will understand that: the invention is not to be considered as limited to the specific embodiments thereof, but is to be understood as being modified in all respects, all changes and equivalents that come within the spirit and scope of the invention.
Claims (9)
1. A driving voltage generation method, comprising:
dividing the drive waveforms into at least 2 groups of sub-drive waveforms according to the characteristics of the drive waveforms;
determining an end point of the sub-drive waveform as a reference voltage;
other reference voltages are determined based on the characteristics of the sub-drive waveforms, the required number of reference voltages, and the determined reference voltages.
2. The method according to claim 1, wherein the drive waveforms are divided into 3 groups of sub-drive waveforms, including in particular: a high voltage segment sub-drive waveform, a medium voltage segment sub-drive waveform, a low voltage segment sub-drive waveform;
the conversion rate value of the liquid crystal corresponding to the high-voltage segment sub-drive waveform to the voltage is greater than or equal to the conversion rate value of the liquid crystal corresponding to the medium-voltage segment sub-drive waveform to the voltage; and the conversion rate value of the liquid crystal corresponding to the middle-voltage segment sub-driving waveform to the voltage is greater than or equal to the conversion rate value of the liquid crystal corresponding to the low-voltage segment sub-driving waveform to the voltage.
3. The method of claim 2, wherein determining the end point of the sub-drive waveform as a reference voltage comprises:
and determining the endpoints of the high-voltage segment sub-driving waveform, the medium-voltage segment sub-driving waveform and the low-voltage segment sub-driving waveform as reference voltages.
4. The method of claim 3, wherein determining other reference voltages based on the characteristics of the sub-drive waveforms, the required number of reference voltages, and the determined reference voltages comprises:
determining the slope of each sub-driving waveform according to the respective end points of the high-voltage segment sub-driving waveform, the medium-voltage segment sub-driving waveform and the low-voltage segment sub-driving waveform;
other reference voltages are determined by interpolation based on the slope of each sub-drive waveform.
5. The method of claim 3, wherein the required number of reference voltages is 18;
the endpoints of the high-voltage segment sub-drive waveform are determined as a first reference voltage, a fourth reference voltage, a fifteenth reference voltage, and an eighteenth reference voltage;
the endpoints of the mid-voltage segment sub-drive waveform are determined as a fourth reference voltage, a seventh reference voltage, a twelfth reference voltage, and a fifteenth reference voltage;
the endpoints of the low-voltage segment sub-drive waveform are determined as a seventh reference voltage, a ninth reference voltage, a tenth reference voltage, and a twelfth reference voltage.
6. The method of claim 1, wherein the required number of reference voltages is 10, 14, 18 or 22.
7. A source driving circuit characterized in that a reference voltage is determined by the driving voltage generating method according to any one of claims 1 to 6.
8. An array substrate comprising the source driver circuit of claim 7.
9. A display device comprising the array substrate according to claim 8.
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| KR100399737B1 (en) * | 2001-11-13 | 2003-09-29 | 김정국 | Method of wave form segmentation and characterization of the segmented interval thereof |
| JP4379399B2 (en) * | 2005-09-06 | 2009-12-09 | セイコーエプソン株式会社 | Gamma curve generation method and apparatus |
| CN1929623A (en) * | 2006-09-26 | 2007-03-14 | 天津通广微电子有限公司 | Gamma correcting chip forming method based on segment two-dots method |
| CN101771827A (en) * | 2008-12-29 | 2010-07-07 | 深圳艾科创新微电子有限公司 | Device and method for regulating image brightness by gamma |
| CN101826308B (en) * | 2009-03-03 | 2012-07-11 | 联咏科技股份有限公司 | Gamma voltage generator and gamma voltage generator thereof |
| US8773920B2 (en) * | 2012-02-21 | 2014-07-08 | International Business Machines Corporation | Reference generator with programmable M and B parameters and methods of use |
| US9536497B2 (en) * | 2013-12-02 | 2017-01-03 | Shenzhen China Star Optoelectronics Technology, Co., Ltd | Gamma voltage driving circuit, source driving module, and liquid crystal panel |
| CN104933998B (en) * | 2014-03-21 | 2017-09-22 | 联咏科技股份有限公司 | Gamma voltage generating device and method for generating gamma voltage |
| US9536485B2 (en) * | 2014-08-18 | 2017-01-03 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Gamma voltage generating module and liquid crystal panel |
| CN107068055B (en) * | 2017-05-17 | 2019-02-15 | 京东方科技集团股份有限公司 | A kind of the gamma electric voltage method of adjustment and device of curved face display panel |
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