CN108877724A - A kind of LCD driving circuit for supporting a variety of frame per second to show - Google Patents
A kind of LCD driving circuit for supporting a variety of frame per second to show Download PDFInfo
- Publication number
- CN108877724A CN108877724A CN201810955271.0A CN201810955271A CN108877724A CN 108877724 A CN108877724 A CN 108877724A CN 201810955271 A CN201810955271 A CN 201810955271A CN 108877724 A CN108877724 A CN 108877724A
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- CN
- China
- Prior art keywords
- common voltage
- lcd driving
- common
- variety
- driving circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
Abstract
The LCD driving circuit that the present invention relates to a kind of for supporting a variety of frame per second to show, what is solved is the technical problem under normal mode with display effect difference under low frequency mode, it include common voltage output circuit by using the LCD driving circuit, there are two common voltage output ends for common voltage output circuit, one common voltage output end is used for low frequency driving, another common voltage output end is used for the technical solution of high-frequency drive, preferably resolves the problem, can be used in LCD display.
Description
Technical field
The present invention relates to LCD drive areas, and in particular to a kind of LCD driving circuit for supporting a variety of frame per second to show.
Background technique
Super low-power consumption liquid crystal display panel at present（ULTRA-LOW POWER LCD）It is a development of LCD display panel
Trend, major LCD manufacturer are all the low-power consumption products for researching and developing oneself.Driver IC circuits can support LCD work in normal mode
And low frequency mode, to reduce its power consumption.But the common voltage under both states can be variant, will cause flashing.
Existing LCD driving circuit using single public electrode voltages mode, in normal mode and low frequency mode
It is lower to use the same common voltage, it causes under both of which without using optimal common voltage, one can not be found properly
Grayscale, display effect is poor, it may appear that flashing state.In order to solve the above technical problem, the present invention provides one kind for supporting
The LCD driving circuit that a variety of frame per second are shown.
Summary of the invention
It is poor using single common voltage display effect that the technical problem to be solved by the present invention is to existing in the prior art
The technical issues of.A kind of new LCD driving circuit for supporting a variety of frame per second to show is provided, this is used to support a variety of frame per second
The LCD driving circuit of display has the characteristics that display effect is good, is less prone to flashing.
In order to solve the above technical problems, the technical solutions adopted are as follows：
A kind of LCD driving circuit for supporting a variety of frame per second to show, the LCD driving circuit include common voltage output electricity
Road, there are two common voltage output end, a common voltage output ends to be used for low frequency driving for common voltage output circuit, another
Common voltage output end is used for high-frequency drive.
The working principle of the invention：Generally common LCD driving circuit can only all support common voltage all the way, i.e. VCOM.Example
Such as, LCD can show more grayscale in the normal working frequency of 60HZ, at this moment be selected using the display effect of intermediate ash as standard
A best VCOM value is selected, while in other grayscale also available relatively good display effect.When LCD works very low
Frequency such as 1HZ when, the grayscale that can be shown is considerably less, can not find a suitable grayscale as finding best VCOM value
Standard, while because the characteristic of low frequency driving LCD is varied.Therefore it needs just LCD display effect can be made to reach using new VCOM
To best.And when display screen is supported to show under normal frequency and low frequency, it is necessary to support multichannel vcom could be in two kinds of moulds
Preferable display effect can be obtained under formula.At different frequencies, a variety of VCOM voltage is provided, can be dry mountain FLICKER
The problem of screen flash, and then improve display effect.
In above scheme, for optimization, further, the common voltage output circuit includes voltage input end, with voltage
The switch unit of input terminal connection, the first adjustable voltage converter unit being connect with the switch unit first branch, with switch unit
Second adjustable voltage converter unit of second branch connection；
The control terminal of the first adjustable voltage converter unit and the second adjustable voltage converter unit is connected with processor, output end
It is correspondingly connected with to two common voltage output ends, processor is also connect with the control terminal of switch unit；
The processor is used to select the first adjustable voltage converter unit of control and the second adjustable electric buckling according to LCD driving frequency
Change the output voltage values of unit.
Further, the processor inquires corresponding driving voltage by dynamic password corresponding with LCD driving frequency
Value, and corresponding switch unit branch is matched by dynamic password；Corresponding switch unit branch road is controlled according to query result
Adjustable voltage converter unit export best common voltage value.
Further, the processor is connected with internal storage location, is equipped with common voltage parameter library, common electrical in internal storage location
Pressure parameter library is the functional relation of LCD driving frequency and best common voltage value；
The processor matches corresponding best common voltage value according to LCD driving frequency.
Further, the common voltage output circuit has multiple common voltage output ends, the output of common voltage output end
Best common voltage value corresponding with LCD driving frequency.
Beneficial effects of the present invention：
For the present invention by the way that multiple common voltages are arranged, i.e. VCOM can under different frequency operating modes for LCD driving circuit
Optimal common voltage value standard is selected, so that LCD is shown under normal frequency and low frequency, is shown under normal frequency mostly grey
Rank, VCOM are arranged according to intermediate grayscale；Lower 2 grayscale of display of low frequency, VCOM are arranged according to black state effect.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1, the LCD drive circuit schematic diagram for supporting a variety of frame per second to show in embodiment 1.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to limit
The fixed present invention.
Embodiment 1
The LCD driving circuit that the present embodiment provides a kind of for supporting a variety of frame per second to show, such as Fig. 1, the LCD driving circuit packet
Common voltage output circuit is included, there are two common voltage output end, a common voltage output ends to use for common voltage output circuit
In low frequency driving, another common voltage output end is used for high-frequency drive.
Workflow of the invention：2 output ends of common voltage output end, one is used for low frequency driving, and one is used for
High-frequency drive, low frequency driving correspond to low-power consumption mode, and high-frequency drive corresponds to normal mode of operation.Respectively, after first determining mode,
Common voltage output circuit determines one common voltage of output, i.e. VCOM.The VCOM is according to low frequency operation and high-frequency work
What characteristic determined.2 grayscale are only shown when low frequency, VCOM is arranged according to black state effect.More grayscale are shown when high frequency, VCOM is in
Between grayscale be arranged.Specific VCOM test process repeats no more, and existing method can be used to measure.Through this embodiment,
Screen flicker can actually be improved.
Specifically, such as Fig. 1, the common voltage output circuit includes voltage input end, and what is connect with voltage input end opens
Unit is closed, the first adjustable voltage converter unit connecting with the switch unit first branch is connect with switch unit second branch
Second adjustable voltage converter unit；The control terminal of the first adjustable voltage converter unit and the second adjustable voltage converter unit is equal
It is connected with processor, output end is correspondingly connected with to two common voltage output ends, and processor is also connect with the control terminal of switch unit；
The processor is used to that the first adjustable voltage converter unit of control and the second adjustable voltage to be selected to convert according to LCD driving frequency single
The output voltage values of member.The voltage transformation module of integrated circuit can be used in the adjustable voltage converter unit of the present embodiment, the voltage
Conversion module can satisfy various control mode, and the prior art can satisfy.Processor uses single-chip microcontroller or logic gates
?.
For control mode, dynamic password can be used, i.e. OTP is controlled, or is carried out parameter and tabled look-up, and processor carries out
Corresponding selection.The mode that VCOM voltage is arranged is variable output to voltage, and institute is arranged particular by the code of control unit
The VCOM value needed（Existing technology is not repeating）Or OTP is carried out to DRIVER IC to fix.
Specifically, the processor inquires corresponding driving voltage value by dynamic password corresponding with LCD driving frequency,
And corresponding switch unit branch is matched by dynamic password；According to query result control corresponding switch unit branch road can
Voltage transformation module is adjusted to export best common voltage value.Programmed algorithm is realized using existing parameter lookup algorithm and control algolithm
The present embodiment function.
It is another then be that processor is connected with internal storage location, common voltage parameter library, common voltage are equipped in internal storage location
Parameter library is the functional relation of LCD driving frequency and best common voltage value；The processor is according to the matching pair of LCD driving frequency
The best common voltage value answered.
In order to which the finer best common voltage of selection corresponds to working frequency, it is preferable that the common voltage output circuit
There are multiple common voltage output ends, common voltage output end exports best common voltage value corresponding with LCD driving frequency.
Although the illustrative specific embodiment of the present invention is described above, in order to the technology of the art
Personnel are it will be appreciated that the present invention, but the present invention is not limited only to the range of specific embodiment, to the common skill of the art
For art personnel, as long as long as various change the attached claims limit and determine spirit and scope of the invention in, one
The innovation and creation using present inventive concept are cut in the column of protection.
Claims (5)
1. a kind of LCD driving circuit for supporting a variety of frame per second to show, it is characterised in that：The LCD driving circuit includes public affairs
Common-battery voltage follower circuit, there are two common voltage output ends for common voltage output circuit, and a common voltage output end is for low
Frequency drives, another common voltage output end is used for high-frequency drive.
2. the LCD driving circuit according to claim 1 for supporting a variety of frame per second to show, it is characterised in that：The public affairs
Common-battery voltage follower circuit includes voltage input end, the switch unit connecting with voltage input end, is connected with the switch unit first branch
The the first adjustable voltage converter unit connect, the second adjustable voltage converter unit being connect with switch unit second branch；
The control terminal of the first adjustable voltage converter unit and the second adjustable voltage converter unit is connected with processor, output end
It is correspondingly connected with to two common voltage output ends, processor is also connect with the control terminal of switch unit；
The processor is used to select the first adjustable voltage converter unit of control and the second adjustable electric buckling according to LCD driving frequency
Change the output voltage values of unit.
3. the LCD driving circuit according to claim 2 for supporting a variety of frame per second to show, it is characterised in that：The place
It manages device and corresponding driving voltage value is inquired by dynamic password corresponding with LCD driving frequency, and pass through dynamic password matching pair
The switch unit branch answered；The adjustable voltage converter unit output of corresponding switch unit branch road is controlled most according to query result
Good common voltage value.
4. the LCD driving circuit according to claim 2 for supporting a variety of frame per second to show, it is characterised in that：The place
Reason device is connected with internal storage location, is equipped with common voltage parameter library in internal storage location, common voltage parameter library be LCD driving frequency and
The functional relation of best common voltage value；
The processor matches corresponding best common voltage value according to LCD driving frequency.
5. the LCD driving circuit according to claim 1 for supporting a variety of frame per second to show, it is characterised in that：The public affairs
Common-battery voltage follower circuit has multiple common voltage output ends, and the output of common voltage output end is corresponding with LCD driving frequency best
Common voltage value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810955271.0A CN108877724A (en) | 2018-08-21 | 2018-08-21 | A kind of LCD driving circuit for supporting a variety of frame per second to show |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810955271.0A CN108877724A (en) | 2018-08-21 | 2018-08-21 | A kind of LCD driving circuit for supporting a variety of frame per second to show |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108877724A true CN108877724A (en) | 2018-11-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810955271.0A Pending CN108877724A (en) | 2018-08-21 | 2018-08-21 | A kind of LCD driving circuit for supporting a variety of frame per second to show |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114677979A (en) * | 2020-12-24 | 2022-06-28 | 乐金显示有限公司 | Display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104376820A (en) * | 2013-08-15 | 2015-02-25 | 友达光电股份有限公司 | Display device and adjusting method thereof |
| CN107039013A (en) * | 2017-05-25 | 2017-08-11 | 上海中航光电子有限公司 | A kind of display driver circuit plate, its driving method and display device |
| US20170249892A1 (en) * | 2015-10-20 | 2017-08-31 | Iml International | Variable VCOM Level Generator |
| CN107221273A (en) * | 2017-07-04 | 2017-09-29 | 华显光电技术（惠州）有限公司 | Display screen flashes method of testing |
| CN107464540A (en) * | 2017-09-26 | 2017-12-12 | 京东方科技集团股份有限公司 | Liquid crystal display, display panel and its VCOM voltage control methods and device |
-
2018
- 2018-08-21 CN CN201810955271.0A patent/CN108877724A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104376820A (en) * | 2013-08-15 | 2015-02-25 | 友达光电股份有限公司 | Display device and adjusting method thereof |
| US20170249892A1 (en) * | 2015-10-20 | 2017-08-31 | Iml International | Variable VCOM Level Generator |
| CN107039013A (en) * | 2017-05-25 | 2017-08-11 | 上海中航光电子有限公司 | A kind of display driver circuit plate, its driving method and display device |
| CN107221273A (en) * | 2017-07-04 | 2017-09-29 | 华显光电技术（惠州）有限公司 | Display screen flashes method of testing |
| CN107464540A (en) * | 2017-09-26 | 2017-12-12 | 京东方科技集团股份有限公司 | Liquid crystal display, display panel and its VCOM voltage control methods and device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114677979A (en) * | 2020-12-24 | 2022-06-28 | 乐金显示有限公司 | Display device |
| US11862107B2 (en) | 2020-12-24 | 2024-01-02 | Lg Display Co., Ltd. | Display apparatus |
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Application publication date: 20181123 |