CN1731497A - Method of power saving for thin film transistor LCD - Google Patents
Method of power saving for thin film transistor LCD Download PDFInfo
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- CN1731497A CN1731497A CN 200510090676 CN200510090676A CN1731497A CN 1731497 A CN1731497 A CN 1731497A CN 200510090676 CN200510090676 CN 200510090676 CN 200510090676 A CN200510090676 A CN 200510090676A CN 1731497 A CN1731497 A CN 1731497A
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Abstract
The invention relates to a method for saving electricity of a thin film liquid crystal display. It uses different frequency to update the picture by the change degree of the picture data during the picture displaying. It can reduce the frequency of the time-schedule controller, the riddle promoter and the source end promoter and so on.
Description
Technical field
The invention relates to a kind of electricity saving method of LCD, and particularly relevant for a kind of method of power saving for thin film transistor LCD.
Background technology
LCD has been owing to possessed the advantage of light, thin, power saving, radiationless and low electromagnetic interference (EMI), and widely applies various electronic products such as phone, mobile computer, personal digital assistant (PDA), digital camera, digital camera in action.Add that industry actively drops into research and development, the quality of LCD is constantly promoted.
Fig. 1 is the circuit diagram of available liquid crystal display panel, please refer to Fig. 1, it has comprised time schedule controller 102, gate drivers 104, source electrode driver 106 and liquid crystal panel 108, wherein liquid crystal panel 108 inside comprise that again most bar gate lines 110 are in order to the transmission sweep signal, source electrode line 112 is in order to the transmission signal of video signal, and a picture element matrix, by 112 of gate line 110 and source electrode lines around zone institute constituted.And comprised in the picture element matrix that thin film transistor (TFT) 114 is in order to drive liquid crystal according to sweep signal and transmission signal of video signal.
As seen from Figure 1, Thin Film Transistor-LCD is to belong to the display of holding permanent form (Hold Type).Because general personal computer, mobile computer, mobile phone and personal digital assistant (PDA) user are when using operating system (for example Windows system), overwhelming majority picture all is the literal or the picture of transfixion or slowly change, can upgrade (re-flash) again for the picture part that does not have change always.Yet now the LCD turnover rate is about 60 of per seconds (or per second 75) picture, and for tableaux, so high turnover rate can cause many unnecessary power consumptions.
Summary of the invention
Purpose of the present invention is exactly that a kind of method of power saving for thin film transistor LCD is being provided, in order to reduce the Thin Film Transistor-LCD power consumption.
The present invention proposes a kind of method of power saving for thin film transistor LCD, its during display frame, according to the change degree of picture data, but and in picture identification scope, use the first different renewal frequencies and second renewal frequency with frame update.
The present invention proposes a kind of method of power saving for thin film transistor LCD, and it judges whether to enter low power consumption mode; And after entering low power consumption mode, during display frame, use lower turnover rate with frame update.
Beneficial effect of the present invention is, owing to reduce turnover rate, and can be so that time schedule controller, gate drivers, source electrode driver or the like integrated circuit operation frequency reduces, to reach the purpose of low power consumption.
Description of drawings
Fig. 1 is the circuit diagram of existing liquid crystal display panel of thin film transistor;
Fig. 2 uses the method for power saving for thin film transistor LCD for one embodiment of the invention and implements circuit block diagram;
Fig. 3 is that amorphous silicon film transistor (Amorphous-TFT) grid voltage is for the electric current experimental data figure;
Fig. 4 be amorphous silicon film transistor (Amorphous-TFT) when having the environment irradiation, grid voltage is for the electric current experimental data figure;
Fig. 5 is that when having the environment irradiation, grid voltage is for the electric current experimental data figure for low-temperature polysilicon film transistor (Low Temperature Polysilicon TFT);
Fig. 6 is the method flow diagram of one embodiment of the invention power saving for thin film transistor LCD;
Fig. 7 is the structural drawing of time schedule controller of the present invention.
The primary clustering symbol description:
Time schedule controller 102,200 gate drivers 104,206
Source electrode driver 106,204 liquid crystal panels 108
Thin film transistor (TFT) 114 direct currents are to dc voltage changer 202
Receive picture frame picture 601
According to the picture frame picture that receives, confirm whether to enter low power consumption mode 603
During display frame, with lower turnover rate frame update 607
Embodiment
For the present invention above-mentioned and other purpose, feature and advantage can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Fig. 2 please refer to Fig. 2 for the circuit block diagram of the electricity saving method of one embodiment of the invention use Thin Film Transistor-LCD.Comprised time schedule controller 200, direct current to dc voltage changer 202, source electrode driver 204 with gate drivers 206.Time schedule controller 200 mainly is in order to receive image data, to output signal to direct current to dc voltage changer 202, source electrode driver 204 and gate drivers 206 according to image data.The drive signal that gate drivers 206 receives time schedule controller 200 is done picture scanning.Direct current receives the video data of time schedule controller 200 to dc voltage changer 202 and source electrode driver 204.During general operation, the LCD per second upgrades 60 pictures, and at this moment, time schedule controller 200 must be operated at high frequency.Same, source electrode driver 204 and gate drivers 206 also must operate in high frequency.Yet operating frequency is high more, and dynamic power consumption is big more.
(this control signal may not be single signal to utilize time schedule controller 200 to send the low power consumption signal, may merge active data driver/gate drivers integrated circuit control signal), determine whether each driving circuit will enter the low power consumption operator scheme, after this low power consumption operator scheme begins, all picture update rates are reduced (for example per second upgrades 5 pictures), at this moment, because picture update rate reduces, can make time schedule controller 200, source electrode driver 204 and gate drivers 206 operating frequencies reduce, because Thin Film Transistor-LCD is to belong to the display of holding permanent form (Hold Type), for tableaux, do not need high turnover rate promptly can show, in addition, because reduction operation frequency, promptly can lower dynamic power consumption,, estimate the power consumption that can reduce at least more than 50% at embodiments of the invention.
Fig. 3 be amorphous silicon film transistor (Amorphous-TFT) grid voltage for the electric current experimental data figure, as can be seen from the figure, when amorphous silicon film transistor when transistor switch cuts out, leakage current can be described as very little.Fig. 4 be amorphous silicon film transistor (Amorphous-TFT) when having environment irradiation (backlight), grid voltage please refer to Fig. 4 for the electric current experimental data figure.Can see among Fig. 4 that when having backlight illumination transistorized leakage current can promote about 10000 times.But this moment, still can change sweep frequency according to experimental result, for example the picture frame turnover rate is reduced to 10 of per seconds by 60 of per seconds, if when being applied to mobile phone or digital camera, because of backlight adopts light emitting diode (LED), much lower compared to cold cathode fluorescent lamp (CCFL) light intensity, and show image also the overwhelming majority be tableaux, so just can reduce the power consumption of display panel significantly.Fig. 5 is that low-temperature polysilicon film transistor (Low-Temperature Polysilicon TFT) is when having environment irradiation (backlight), grid voltage is for the electric current experimental data figure, the low-temperature polysilicon film transistor leakage current is lower for the irradiation susceptibility as seen from Figure 5, panel as if be implemented on low-temperature polysilicon film transistor with the inventive method can significantly reduce this display panel power consumption.
Fig. 6 please refer to Fig. 6 for the method flow diagram of power saving for thin film transistor LCD of the present invention.At first, receive the picture frame picture, step 601.According to the picture frame picture that receives, confirm whether to enter low power consumption pattern, step 603.If be judged as not, then with general display operation, step 605 if be judged as is, during display frame, with lower picture update rate frame update, step 607.
Fig. 7 is the structural drawing of time schedule controller of the present invention, as shown in the figure, time schedule controller receives the image video data signal, data in this signal and the picture frame picture buffer are contrasted, utilize numerical data comparison algorithm to judge, if the image video data that receives with respect to existing image video data for changing slower data display panel with lower renewal frequency display frame, otherwise will be with normal renewal frequency display frame, and by time sequence controller grid driver and source electrode driver to reach specific renewal frequency.
In sum, the present invention changes the method for renewal frequency because of adopting LCD, reduces turnover rate, can be so that time schedule controller, gate drivers, source electrode driver or the like integrated circuit operation frequency reduces, to reach the purpose of low power consumption.
Though the present invention has done explanation as above with preferred embodiment; but it is not in order to limit the present invention; any those skilled in the art; in not breaking away from method of the present invention and scope; can do various replacements and modification, so protection domain of the present invention being as the criterion with defined in claims.
Claims (3)
1. the method for a power saving for thin film transistor LCD is characterized in that:
During display frame,, but in picture identification scope, use the first different renewal frequencies and second renewal frequency with frame update according to the change degree of picture data.
2. the method for a power saving for thin film transistor LCD is characterized in that comprising:
Judge whether to enter low power consumption mode; And
After entering low power consumption mode, during display frame, use lower turnover rate with frame update.
3. the method for a kind of power saving for thin film transistor LCD according to claim 2 is characterized in that judging whether to enter low power consumption mode comprises:
Receive the picture frame picture, and the data in itself and the picture frame picture buffer are compared, to judge whether to enter low power consumption mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200510090676 CN1731497A (en) | 2005-08-18 | 2005-08-18 | Method of power saving for thin film transistor LCD |
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|---|---|---|---|
| CN 200510090676 CN1731497A (en) | 2005-08-18 | 2005-08-18 | Method of power saving for thin film transistor LCD |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7893933B2 (en) | 2006-05-23 | 2011-02-22 | Au Optronics Corp. | Panel module and the power saving method used thereon |
| CN102543023A (en) * | 2012-01-10 | 2012-07-04 | 硅谷数模半导体（北京）有限公司 | Receiving equipment and method, device and system for controlling video refreshing rate |
| CN102568413A (en) * | 2010-11-30 | 2012-07-11 | 乐金显示有限公司 | Liquid crystal display device and driving method thereof |
| CN104111721A (en) * | 2014-06-30 | 2014-10-22 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN104112420A (en) * | 2013-04-22 | 2014-10-22 | 三星显示有限公司 | Display device and driving method thereof |
| CN104952414A (en) * | 2015-04-09 | 2015-09-30 | 友达光电股份有限公司 | Image display method, display device and operation method thereof |
| CN106375842A (en) * | 2016-09-29 | 2017-02-01 | 努比亚技术有限公司 | Image sharing device and method |
| JP2018180562A (en) * | 2009-10-16 | 2018-11-15 | 株式会社半導体エネルギー研究所 | Liquid crystal display device |
| CN110824800A (en) * | 2009-10-16 | 2020-02-21 | 株式会社半导体能源研究所 | Display device |
| CN112530352A (en) * | 2020-12-24 | 2021-03-19 | 上海天马有机发光显示技术有限公司 | Driving method and driving device of display device |
| CN114237062A (en) * | 2021-12-15 | 2022-03-25 | 深圳绿米联创科技有限公司 | Device control method and apparatus, electronic device, and medium |
-
2005
- 2005-08-18 CN CN 200510090676 patent/CN1731497A/en active Pending
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7893933B2 (en) | 2006-05-23 | 2011-02-22 | Au Optronics Corp. | Panel module and the power saving method used thereon |
| JP2018180562A (en) * | 2009-10-16 | 2018-11-15 | 株式会社半導体エネルギー研究所 | Liquid crystal display device |
| CN110824800B (en) * | 2009-10-16 | 2022-07-26 | 株式会社半导体能源研究所 | Display device |
| CN110824800A (en) * | 2009-10-16 | 2020-02-21 | 株式会社半导体能源研究所 | Display device |
| US10565946B2 (en) | 2009-10-16 | 2020-02-18 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device and electronic device including the liquid crystal display device |
| CN102568413A (en) * | 2010-11-30 | 2012-07-11 | 乐金显示有限公司 | Liquid crystal display device and driving method thereof |
| US9070341B2 (en) | 2010-11-30 | 2015-06-30 | Lg Display Co., Ltd. | Liquid crystal display device and driving method thereof |
| CN102568413B (en) * | 2010-11-30 | 2015-09-23 | 乐金显示有限公司 | Liquid crystal display and driving method thereof |
| CN102543023A (en) * | 2012-01-10 | 2012-07-04 | 硅谷数模半导体（北京）有限公司 | Receiving equipment and method, device and system for controlling video refreshing rate |
| CN102543023B (en) * | 2012-01-10 | 2014-04-02 | 硅谷数模半导体（北京）有限公司 | Receiving equipment and method, device and system for controlling video refreshing rate |
| CN104112420A (en) * | 2013-04-22 | 2014-10-22 | 三星显示有限公司 | Display device and driving method thereof |
| CN104112420B (en) * | 2013-04-22 | 2018-10-09 | 三星显示有限公司 | Display device and its driving method |
| US9972237B2 (en) | 2013-04-22 | 2018-05-15 | Samsung Display Co., Ltd. | Display device and driving method thereof |
| CN104111721B (en) * | 2014-06-30 | 2018-07-06 | 联想(北京)有限公司 | A kind of information processing method and electronic equipment |
| CN104111721A (en) * | 2014-06-30 | 2014-10-22 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN104952414A (en) * | 2015-04-09 | 2015-09-30 | 友达光电股份有限公司 | Image display method, display device and operation method thereof |
| CN106375842A (en) * | 2016-09-29 | 2017-02-01 | 努比亚技术有限公司 | Image sharing device and method |
| CN112530352A (en) * | 2020-12-24 | 2021-03-19 | 上海天马有机发光显示技术有限公司 | Driving method and driving device of display device |
| CN112530352B (en) * | 2020-12-24 | 2023-07-25 | 武汉天马微电子有限公司 | Driving method and driving device of display device |
| CN114237062A (en) * | 2021-12-15 | 2022-03-25 | 深圳绿米联创科技有限公司 | Device control method and apparatus, electronic device, and medium |
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Owner name: YOUDA PHOTOELECTRIC CO., LTD. Free format text: FORMER OWNER: GUANGHUI ELECTRONIC CO., LTD. Effective date: 20071130 |
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Effective date of registration: 20071130 Address after: Hsinchu County of Taiwan Province Applicant after: AU Optronics Corporation Address before: Taoyuan County of Taiwan Province Applicant before: Guanghui Electronic Co., Ltd. |
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