CN106023931A - LCD screen and energy-saving control method thereof - Google Patents
LCD screen and energy-saving control method thereof Download PDFInfo
- Publication number
- CN106023931A CN106023931A CN201610580337.3A CN201610580337A CN106023931A CN 106023931 A CN106023931 A CN 106023931A CN 201610580337 A CN201610580337 A CN 201610580337A CN 106023931 A CN106023931 A CN 106023931A
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- liquid crystal
- crystal panel
- management chip
- time schedule
- schedule controller
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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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses an LCD screen and an energy-saving control method thereof. The LCD screen comprises a liquid crystal panel, and a time sequence controller and a power supply management chip which are used for controlling the liquid crystal panel, wherein the power supply management chip can output high voltage required for turning on the liquid crystal panel and low voltage required for turning off the liquid crystal panel to the liquid crystal panel, and the time sequence controller makes the power supply management chip stop outputting the high voltage and low voltage required by the liquid crystal panel in an operating state during blanking of a frame of data, so that the liquid crystal panel is in a non-operating state. The LCD screen and the energy-saving control method thereof can effectively reduce the energy consumption of the LCD screen.
Description
Technical field
The present invention relates to the Energy Saving Control of liquid crystal display screen, particularly relate to the duty of liquid crystal panel is controlled.
Background technology
Liquid crystal display screen generally includes liquid crystal panel and corresponding drive system.Wherein, drive system mainly includes time schedule controller, gate data line drive, source electrode scan line driver, power management chip and GAMMA automatic correction system.Time schedule controller is mainly responsible for carrying out the conversion of data, and the LVDS differential signal brought by governor circuit SCALER is converted into the MINI-LVDS signal that low amplitude value transmission frequency is high, and output is to this source electrode scan line driver；Meanwhile, to be also responsible for output drives the clock signal of liquid crystal panel to this gate data line drive and source electrode scan line driver.Supply voltage necessary to power management chip feed system and liquid crystal display screen panel be switched on and off required generating positive and negative voltage.GAMMA automatic correction system is responsible for exporting the gray scale voltage needed for liquid crystal display images shows.
Shown in Figure 1 go out the work schedule schematic diagram of liquid crystal display screen.Corresponding with data signal DATA that governor circuit SCALER provides, time schedule controller controls the timing control signal of output mainly STV signal and TP signal.Wherein, STV signal is the time schedule controller control signal to gate data line drive, and STV signal is corresponding to the initial signal of a two field picture.TP signal is the time schedule controller control signal to source electrode scan line driver, and TP signal is corresponding to the data source row latch signal of source electrode driver.Power management chip is then responsible for low-voltage VGL needed for providing liquid crystal panel to open required high voltage VGH and turn off.
After refreshing at a two field picture, next frame image does not also start to when, meeting blanking interval (BLANKING) for some time, corresponding to the blanking interval of each frame, existing way is the data that time schedule controller exports black field.It is to say, power management chip is to be in mode of operation all the time within this period of time, because now liquid crystal panel needs work to show the data of black field.Existing liquid crystal display screen, in entire image during refreshing, power management chip has voltage output to be given to liquid crystal panel all the time.Visible, existing liquid crystal display screen, in entire image during refreshing, power management chip is to have voltage output to be given to liquid crystal panel all the time.
Summary of the invention
The technical problem to be solved in the present invention is the deficiency overcoming above-mentioned prior art to exist, and proposes a kind of liquid crystal display screen and energy-saving control method thereof, can be effectively reduced the energy consumption of liquid crystal display screen.
The technical scheme that the present invention is directed to above-mentioned technical problem and propose includes, a kind of liquid crystal display screen is proposed, including: liquid crystal panel with for controlling time schedule controller and the power management chip of this liquid crystal panel, this power management chip can be to the low-voltage needed for the output of this liquid crystal panel is opened required high voltage and turned off, during the blanking interval of frame data, this time schedule controller is can to control this power management chip to stop exporting the high voltage needed for this liquid crystal panel duty and low-voltage, so that this liquid crystal panel is in off working state.
The technical scheme that the present invention is directed to above-mentioned technical problem and propose also includes, the energy-saving control method of a kind of liquid crystal display screen is proposed, this liquid crystal display screen includes liquid crystal panel and for controlling time schedule controller and the power management chip of this liquid crystal panel, this power management chip can be to the low-voltage needed for the output of this liquid crystal panel is opened required high voltage and turned off, during the blanking interval of frame data, this time schedule controller makes this power management chip stop exporting the high voltage needed for this liquid crystal panel duty and low-voltage so that this liquid crystal panel is in off working state.
Compared with prior art, the liquid crystal display screen of the present invention and energy-saving control method thereof, by during the blanking interval of frame data, controlled power management chip by time schedule controller and stop the high voltage needed for output liquid crystal panel duty and low-voltage, make liquid crystal panel enter off working state at blanking interval, the energy consumption of liquid crystal display screen can be effectively reduced.
Accompanying drawing explanation
Fig. 1 is the work schedule schematic diagram of existing liquid crystal display screen.
Fig. 2 is the schematic flow sheet of the energy-saving control method of the liquid crystal display screen of the present invention.
Fig. 3 is the work schedule schematic diagram of the liquid crystal display screen of the present invention.
Fig. 4 is the structural schematic block diagram of the liquid crystal display screen of the present invention.
Wherein, description of reference numerals is as follows: 41 time schedule controller 42 source data line drive 43 gated sweep line drive 44 power management chip 49 TFT LCD panel.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is given elaboration further.
Seeing Fig. 2, Fig. 3 and Fig. 4, Fig. 2 is the schematic flow sheet of the energy-saving control method of the liquid crystal display screen of the present invention.Fig. 3 is the work schedule schematic diagram of the liquid crystal display screen of the present invention.Fig. 4 is the structural schematic block diagram of the liquid crystal display screen of the present invention.The liquid crystal display screen energy-saving control method of the present invention generally comprises following steps:
S201, judge whether to detect the starting point of blanking interval, if being, go to step S202 and continue with；Otherwise, the coming of starting point of blanking interval is continued waiting for.Specifically, when a two field picture starts to refresh (corresponding to the rising edge of the DATA signal in Fig. 3), time schedule controller 41 can make STV signal be become high level from low level, time delay a period of time subsequently, then output TP signal (data latch signal at once).After STV high level state being detected, the pulse number of TP signal is counted, the starting point of data blank phase can be extrapolated；In other words, the starting point of blanking interval be become high level according to STV signal from low level after, the pulse number of TP signal is counted, when count value reach set threshold value, i.e. representing the starting point detecting blanking interval, it is corresponding with the trailing edge moment of DATA signal.
S202, stop normal voltage output.Specifically, after time schedule controller 41 detects the starting point of the blanking interval of data, universal serial bus can be passed through, power management chip 44 is carried out the write operation of zero level so that power management chip 44 stops the output of normal voltage, namely, high voltage VGH is by the high level vanishing level set, low-voltage VGL is by the negative level vanishing level set, and therefore TFT LCD panel 49 is in off working state, such that it is able to reduce corresponding power consumption.
S203, judge whether to detect the terminating point of blanking interval, if being, go to step S204 and continue with；Otherwise, the coming of terminating point of blanking interval is continued waiting for.Specifically, the terminating point of blanking interval come coming of namely next frame image, in the present embodiment, the rising edge that STV signal is become high level from low level next time occurs the moment i.e. to represent the coming of terminating point of blanking interval, and it is corresponding with the rising edge time of DATA signal.
S204, normal voltage is provided to export.Specifically, after time schedule controller 41 detects the terminating point of the blanking interval of data, universal serial bus can be passed through, power management chip 44 is carried out the write operation of normal voltage, power management chip 44 is made again to recover the output of normal voltage, that is, high voltage VGH is become the high level of setting from zero level, low-voltage VGL is become the negative level of setting from zero level, and therefore TFT LCD panel 49 is the most in running order.
So move in circles, by periodic duty (i.e. providing the state that normal voltage exports) and the off working state (i.e. stopping the state of normal voltage output) of power management chip 44, TFT LCD panel 49 can be made correspondingly to be in normal work and off working state, such that it is able to be effectively reduced the power consumption of liquid crystal display screen.The saving of power consumption is substantially suitable with the off working state accounting in power management chip 44 cycle.In the present embodiment, off working state accounting is about 30%, that is, the power consumption saving of the liquid crystal display screen of the present invention can be up to 30%.
Seeing Fig. 4, the liquid crystal display screen of the present invention includes: time schedule controller 41, source data line drive 42, gated sweep line drive 43, power management chip 44 and TFT LCD panel 49.
The control signal of this time schedule controller 41 output includes: STV signal, CPV signal, OE signal, POL signal and TP signal.Wherein, STV signal, CPV signal and OE signal are the control signals that gated sweep line drive 43 given by time schedule controller 41；POL signal and TP signal are that time schedule controller 41 is to the control signal of source data line drive 42.STV signal is the initial signal of a two field picture.CPV signal is the clock control signal of gated sweep line drive 43 output.OE signal is that the output of gated sweep line drive 43 enables signal.POL signal is the polarity upset signal controlling pixel voltage, has coordinated the sequencing contro of TFT LCD panel 49 according to orderly sequencing contro.TP signal is the data source row latch signal of source electrode scan line driver 43.This time schedule controller 41 has serial bus and drives.In the present embodiment, this serial bus is I2C bus.This time schedule controller may utilize the 12V voltage that governor circuit SCALER brings, and by level conversion, normally worked required voltage.
It is provided with DC/DC conversion module in this power management chip 44, the working power of the 3.3V that can provide for this time schedule controller 41, working power VDDA can be provided for this source data line drive 42, working power VDDD can be provided for this source electrode scan line driver 43, and high voltage VHG and low-voltage VGL can be provided for this TFT LCD panel 49.
This power management chip 44 has built-in eeprom memory, the high voltage VHG of its output and the level of low-voltage VGL, can realize by rewriting the specific address space of eeprom memory.This power management chip 44 has serial bus and drives.In the present embodiment, this serial bus is I2C bus.This time schedule controller 41 and this power management chip 44, by serial bus communications protocol, realize communication therebetween, and then can carry out storage and the erasing of data.
The operation principle of the liquid crystal display screen of the present invention generally comprises: this time schedule controller 41 is started working, by serial bus control, power management chip 44 can be carried out write operation, the voltage (i.e. this TFT LCD panel 49 provides high voltage VHG and low-voltage VGL) normally working required by liquid crystal display screen stores in eeprom memory, carries out normal liquid crystal display screen driving.When need not liquid crystal display screen work when, by time schedule controller 41, the eeprom memory of power management chip 44 is carried out the write operation of no-voltage, this power management chip 44 not output (i.e. high voltage VHG and low-voltage VGL is zero level) can be made, liquid crystal display screen is closed, such that it is able to realize the function of energy saving.
Compared with prior art, the present invention is coordinated with the ingenious of power management chip 44 by time schedule controller 41, zoning goes out the blanking interval of every two field picture and turns off high voltage VHG and the supply of low-voltage VGL of liquid crystal display screen at blanking interval, liquid crystal display screen is made to be in off working state at blanking interval, such that it is able to be substantially reduced the power consumption of liquid crystal display screen.
Foregoing; it is only presently preferred embodiments of the present invention; it is not intended to limit embodiment of the present invention; those of ordinary skill in the art are according to the central scope of the present invention and spirit; corresponding flexible or amendment can be carried out very easily, therefore protection scope of the present invention should be as the criterion with the protection domain required by claims.
Claims (10)
1. a liquid crystal display screen, including: liquid crystal panel with for controlling time schedule controller and the power management chip of this liquid crystal panel, this power management chip can be to the low-voltage needed for the output of this liquid crystal panel is opened required high voltage and turned off, it is characterized in that, during the blanking interval of frame data, this time schedule controller is can to control this power management chip to stop exporting the high voltage needed for this liquid crystal panel duty and low-voltage, so that this liquid crystal panel is in off working state.
2. according to the liquid crystal display screen described in claim 1, it is characterized in that, after the rising edge of the STV signal provided at this time schedule controller, the TP signal providing this time schedule controller counts, until count value reaches to set the first moment of threshold value, using this first moment as the starting point of blanking interval.
3., according to liquid crystal display screen described in claim 2, it is characterised in that after entering blanking interval, the second moment that the rising edge of the STV signal provided at this time schedule controller occurs again, using this second moment as the terminating point of blanking interval.
4. according to the liquid crystal display screen described in claim 1, it is characterized in that, this power management chip has built-in eeprom memory, the storage content of the specific region of this eeprom memory is depended in the output of this liquid crystal panel by this power management chip, and the storage content of the specific region of this eeprom memory can be rewritten by this time schedule controller.
5. according to the liquid crystal display screen described in claim 1, it is characterised in that this power management chip is connected by serial bus communication with this time schedule controller.
6. the energy-saving control method of a liquid crystal display screen, this liquid crystal display screen includes liquid crystal panel and for controlling time schedule controller and the power management chip of this liquid crystal panel, this power management chip can be to the low-voltage needed for the output of this liquid crystal panel is opened required high voltage and turned off, it is characterized in that, during the blanking interval of frame data, this time schedule controller makes this power management chip stop exporting the high voltage needed for this liquid crystal panel duty and low-voltage so that this liquid crystal panel is in off working state.
7. according to the energy-saving control method described in claim 6, it is characterized in that, after the rising edge of the STV signal provided at this time schedule controller, the TP signal providing this time schedule controller counts, until count value reaches to set the first moment of threshold value, using this first moment as the starting point of blanking interval.
8., according to energy-saving control method described in claim 7, it is characterised in that after entering blanking interval, the second moment that the rising edge of the STV signal provided at this time schedule controller occurs again, using this second moment as the terminating point of blanking interval.
9. according to the energy-saving control method described in claim 6, it is characterized in that, this power management chip is made to have built-in eeprom memory, the storage content of the specific region of this eeprom memory is depended in the output of this liquid crystal panel by this power management chip, and the storage content of the specific region of this eeprom memory can be rewritten by this time schedule controller.
10. according to the energy-saving control method described in claim 6, it is characterised in that make this power management chip be connected by serial bus communication with this time schedule controller.
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| CN201610580337.3A CN106023931A (en) | 2016-07-21 | 2016-07-21 | LCD screen and energy-saving control method thereof |
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| CN201610580337.3A CN106023931A (en) | 2016-07-21 | 2016-07-21 | LCD screen and energy-saving control method thereof |
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| CN108665844A (en) * | 2018-05-21 | 2018-10-16 | 京东方科技集团股份有限公司 | Display device and its driving method, driving device |
| WO2019033825A1 (en) * | 2017-08-15 | 2019-02-21 | 京东方科技集团股份有限公司 | Drive circuit and control method therefor, and display panel, and display apparatus |
| CN109559671A (en) * | 2018-12-26 | 2019-04-02 | 惠科股份有限公司 | Display panel and its control method, control device and display equipment |
| CN109767743A (en) * | 2019-03-27 | 2019-05-17 | 昆山龙腾光电有限公司 | Driving circuit and its display device |
| WO2020135072A1 (en) * | 2018-12-26 | 2020-07-02 | 惠科股份有限公司 | Display device and control method and apparatus thereof |
| CN111429858A (en) * | 2020-04-16 | 2020-07-17 | Tcl华星光电技术有限公司 | Display device and power saving method thereof |
| CN112542120A (en) * | 2020-11-24 | 2021-03-23 | 惠科股份有限公司 | Driving circuit of display panel and control method thereof |
| CN112951150A (en) * | 2021-01-29 | 2021-06-11 | 深圳市明微电子股份有限公司 | Energy-saving method, device and equipment for LED display screen and storage medium |
| CN113571001A (en) * | 2021-09-24 | 2021-10-29 | 惠科股份有限公司 | Display device and display system |
| CN113851067A (en) * | 2020-06-28 | 2021-12-28 | 京东方科技集团股份有限公司 | Charging circuit, display device, wearable equipment, display driving method and device |
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| CN113851067A (en) * | 2020-06-28 | 2021-12-28 | 京东方科技集团股份有限公司 | Charging circuit, display device, wearable equipment, display driving method and device |
| WO2022001443A1 (en) * | 2020-06-28 | 2022-01-06 | 京东方科技集团股份有限公司 | Charging circuit, display apparatus, wearable device, and display driving method and apparatus |
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| CN112542120A (en) * | 2020-11-24 | 2021-03-23 | 惠科股份有限公司 | Driving circuit of display panel and control method thereof |
| CN112951150A (en) * | 2021-01-29 | 2021-06-11 | 深圳市明微电子股份有限公司 | Energy-saving method, device and equipment for LED display screen and storage medium |
| CN112951150B (en) * | 2021-01-29 | 2022-06-28 | 深圳市明微电子股份有限公司 | Energy-saving method, device and equipment for LED display screen and storage medium |
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