CN100498438C - LCD device and its backlight control method thereof - Google Patents
LCD device and its backlight control method thereof Download PDFInfo
- Publication number
- CN100498438C CN100498438C CNB2006100600190A CN200610060019A CN100498438C CN 100498438 C CN100498438 C CN 100498438C CN B2006100600190 A CNB2006100600190 A CN B2006100600190A CN 200610060019 A CN200610060019 A CN 200610060019A CN 100498438 C CN100498438 C CN 100498438C
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- drive circuit
- light emitting
- liquid crystal
- crystal indicator
- display panels
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Abstract
This invention provides one LCD device, which comprises one LCD panel, one light conductive board set over the panel, one light source near to the conductive board side and one aphototropism drive circuit to control the source composed of multiple diodes, wherein, the aphototropism drive circuit is to determine the control signals for diodes switch status according to the received visual signals and system display mode signals. This invention also provides one aphototropism control method for the LCD device.
Description
[technical field]
The invention relates to a kind of liquid crystal indicator and method for controlling backlight thereof thereof.
[background technology]
Liquid crystal indicator because of have low diathermaneity, characteristics such as volume is compact and power consumption is low, and ripe and innovation along with correlation technique, kind is various day by day, be widely used in mobile phone, personal digital assistant, portable digital video signal optical disc player (Digital VideoDisc, DVD), field such as notebook computer, PC and TV.But, because display panels itself does not have the characteristics of luminescence, so must cooperate certain light source just can reach display effect.
At present; portable digital video signal optical disc player and this series products have screen saver function more; if it assembles normal bright type liquid crystal indicator; after screen protection program activates; the light source of liquid crystal indicator is not closed, and the screen major part is in black picture state, and promptly liquid crystal is subjected to the driving of maximum voltage always; total system is not except CD-ROM drive operates, and other electron component all is in the power consumption state.In addition, this series products generally has three kinds of system's display modes, be full screen display pattern, black surround pattern (Letterbox) and left and right sides black surround pattern (Pillarbox) up and down, when the two kinds of patterns in back show, subregion in the screen is black picture, and to should still being in illuminating state by regional light source, power consumption is big, and is totally unfavorable for the battery powered portable product that electric weight is limited.
And for large-scale LCD TV, the general light source that adopts cold cathode fluorescent lamp as its display panels, and be combined with the pulsed drive illumination mode that scanning backlight technology (Scan Backlight Technology) or black insertion technology (Black Insertion) come the emulation cathode-ray tube (CRT), can improve the shortcoming that the liquid crystal reaction time is slow and sampling maintenance pattern (Sample and Hold Mode) causes ghost to make that show image is fuzzy, preferable animation quality not only can be provided, and its light source need not open always, also can reach purpose of energy saving.But, large-scale LCD TV is often used the multitube direct type backlight module, and for the middle-size and small-size liquid crystal indicator that is applied to portable products such as portable digital video signal optical disc player, mobile phone, because of side light type back light module is adopted in the restriction in its space more, so can't directly use above-mentioned scanning backlight technology.
[summary of the invention]
In order to overcome the problem that middle-size and small-size liquid crystal indicator power consumption in the prior art is big and be difficult to direct application scanning backlight technology, but the invention provides a kind of power consumption less, the side type liquid crystal indicator of image definition and application scanning backlight technology.
The present invention also provides a kind of method for controlling backlight thereof that is applicable to above-mentioned liquid crystal indicator.
A kind of liquid crystal indicator, comprise a display panels, a sequential control circuit, a scan line drive circuit that is connected with this display panels, one and the light guide plate of the stacked setting of this display panels and light source that contiguous this light guide plate side is provided with and the backlight drive circuit of this light source of control, this display panels comprises many sweep traces that are parallel to each other, and this light source comprises a plurality of light emitting diodes.This sequential control circuit is used for receiving video signal and system's display mode signal and sends synchronous control signal according to its video signal that receives and system's display mode signal to this scan line drive circuit and this backlight drive circuit, and this scan line drive circuit and this backlight drive circuit are used for according to its synchronous control signal that receives driven in synchronism sweep trace and the on off state of controlling these a plurality of light emitting diodes respectively.
A kind of liquid crystal indicator method for controlling backlight thereof, this liquid crystal indicator comprise a display panels and a data line drive circuit that is connected with this display panels and one scan line drive circuit; One light source and a backlight drive circuit that is connected with this light source, this light source are to should the display panels setting, and it comprises a plurality of light emitting diodes; One sequential control circuit, this sequential control circuit are connected with data line drive circuit, scan line drive circuit and backlight drive circuit respectively; This method for controlling backlight thereof may further comprise the steps: sequential control circuit receiving video signal and system's display mode signal; Sequential control circuit sends synchronous control signal according to its video signal that receives and system's display mode signal to scan line drive circuit and backlight drive circuit; Scan line drive circuit and backlight drive circuit receive synchronous control signal and distinguish the sweep trace of this display panels of driven in synchronism and the on off state of control light emitting diode according to this synchronous control signal.
Compared to prior art, liquid crystal indicator provided by the invention and method for controlling backlight thereof utilize sequential control circuit synchro control scan line drive circuit and backlight drive circuit, control the on off state of the light emitting diode of light source respectively, the light emitting diode of light source need not be in opening always, so power consumption is few, and by this method for controlling backlight thereof picture displayed sharpness height, also can effectively reduce the influence of ghost, preferable animation quality is provided.
[description of drawings]
Fig. 1 is the structural representation of liquid crystal indicator first embodiment of the present invention.
Fig. 2 is the block diagram of liquid crystal indicator method for controlling backlight thereof of the present invention.
Fig. 3 and Fig. 4 are the running synoptic diagram of liquid crystal indicator first embodiment of the present invention.
Fig. 5 is the running synoptic diagram of liquid crystal indicator second embodiment of the present invention.
Fig. 6 is the running synoptic diagram of liquid crystal indicator the 3rd embodiment of the present invention.
Fig. 7 is the running synoptic diagram of liquid crystal indicator the 4th embodiment of the present invention.
Fig. 8 is the running synoptic diagram of liquid crystal indicator the 5th embodiment of the present invention.
[embodiment]
Please refer to Fig. 1, is the structural representation of liquid crystal indicator first embodiment of the present invention.This liquid crystal indicator 100 comprises a display panels 12, one and the light guide plate 10 of these display panels 12 stacked settings and the light source 13 that contiguous these light guide plate 10 1 sides are provided with.This display panels 12 comprises many sweep traces that are parallel to each other (figure does not show), and the side of the light guide plate 10 of contiguous light source 13 is vertical with sweep trace.This light source 13 comprises a plurality of light emitting diodes, these a plurality of light emitting diodes utilize surface adhering technology piece in printed circuit board (PCB) (Printed Circuit Board, PCB) on 19, and the display panels zone of corresponding many continuous sweep line traffic controls of each light emitting diode, back lighting is provided.
Please refer to Fig. 2, is the block diagram of liquid crystal indicator 100 method for controlling backlight thereof.This liquid crystal indicator 100 provides a sequential control circuit 11, a data line drive circuit 14, one scan line drive circuit 15 and a backlight drive circuit 16.The input end of this data line drive circuit 14 and scan line drive circuit 15 is connected to sequential control circuit 11 and output terminal is connected to display panels 12, and the input end of this backlight drive circuit 16 is connected in sequential control circuit 11 and output terminal is connected in light source 13.This liquid crystal indicator 100 further provides a manual light modulating device 17 and an automatic light modulation device 18 to be connected to backlight drive circuit 16.
These sequential control circuit 11 synchro control data line drive circuits 14, scan line drive circuit 15 and backlight drive circuit 16.When sequential control circuit 11 receives video signal and system's display mode signal, be about to synchronous control signal and be sent to data line driving circuit 14, scan line drive circuit 15 and backlight drive circuit 16, backlight drive circuit 16 is controlled the on off state of the light emitting diode of light source 13 according to control signal, for display panels 12 provides back lighting, data line drive circuit 14 and scan line drive circuit 15 realize that according to video signal and synchronous control signal the picture of display panels 12 shows.In addition, automatic light modulation device 18 can be adjusted the luminosity of light emitting diode automatically by the photosensor senses external environment light of system, and the user also can use manual light modulating device 17 to regulate the luminosity of light emitting diode according to self needs.
Please refer to Fig. 3, is the running synoptic diagram of liquid crystal indicator of the present invention.System's display mode of this liquid crystal indicator 100 is full screen displays.According to above-mentioned method for controlling backlight thereof, sequential control circuit 11 sends synchronous control signal according to its video signal that receives and system's display mode signal to scan line drive circuit 15 and backlight drive circuit 16, backlight drive circuit 16 is according to synchronous control signal driven in synchronism light source 13, and corresponding light emitting diode is opened or closed to correspondence.
Suppose the display panels zone 121 of light emitting diode 131 corresponding n to n+m bar sweep trace controls, for this display panels zone 121 provides back lighting.The pixel that is opened into this sweep trace when n bar sweep trace is enough charged and is discharged when reaching setting value, and light emitting diode 131 is opened, and up to the n+m+1 bar sweep trace end of scan, light emitting diode 131 is closed.The rest may be inferred for the switch situation of next light emitting diode, shows until a frame picture and finish.So each light emitting diode is opened once in a frame picture procedure for displaying at least.
Side type light source 13 by a plurality of light emitting diodes compositions, adopt sequential control circuit 11 synchro control scan line drive circuits 15 and backlight drive circuit 16, make backlight drive circuit 16 control the light emitting diode of light source 13 respectively, make the light emitting diode of light source 13 not be in opening, so power consumption is few always.And by this method for controlling backlight thereof, can make the middle-size and small-size liquid crystal display product of using this liquid crystal indicator reach the scanning effect backlight of large-scale liquid crystal display television, preferable animation quality promptly improves the picture displayed sharpness, effectively reduces the influence of ghost, so can be provided.For improving the luminance brightness of display panels 12, also can light emitting diode all be set in the limit, two opposite sides of the light guide plate vertical 10 with sweep trace.
In addition, adopt above-mentioned scan mode backlight, the opening time of each light emitting diode is not limited in summation sweep time of m+1 bar sweep trace, can be greater than this time.
But the light emitting diode of this light source 13 also piece in flexible printed wiring board (FlexiblePrinted Circuit, FPC) on.But and this light emitting diode white light emitting diode or red
Blue mixed light light emitting diode.
Please refer to Fig. 4, system's display mode of liquid crystal indicator 100 is black surround patterns up and down.The light emitting diode 132 in corresponding display panels black surround zone 122 is closed, and the light emitting diode 133 in corresponding display panels broadcasting pictures zone 123 is opened.
In addition, also can adopt following backlight control mode: the light emitting diode 132 in corresponding display panels black surround zone 122 is closed, and the light emitting diode 133 in corresponding display panels broadcasting pictures zone 123, then can adopt scan mode backlight by sequential control circuit 11 synchro control scan line drive circuits 15 and backlight drive circuit 16.
Please refer to Fig. 5, is the running synoptic diagram of liquid crystal indicator second embodiment of the present invention.The difference of the liquid crystal indicator 100 of this liquid crystal indicator 200 and first embodiment is: light guide plate of this liquid crystal indicator 200 (figure does not show) and display panels 22 stacked settings, contiguous this light guide plate one side setting of a plurality of light emitting diodes of light source 23, this side is parallel with the sweep trace of display panels 22.
Please refer to Fig. 6, is the running synoptic diagram of liquid crystal indicator the 3rd embodiment of the present invention.The difference of the liquid crystal indicator 200 of this liquid crystal indicator 300 and second embodiment is: a plurality of light emitting diodes of the light source 33 of this liquid crystal indicator 300 are respectively adjacent in the limit, two opposite sides of this light guide plate (figure does not show) and are provided with, and this dual-side is parallel with the sweep trace of display panels 32.
Liquid crystal indicator 200,300 for second and third embodiment of the present invention, when if its system's display mode is left and right sides black surround pattern, the light emitting diode in corresponding display panels black surround zone is closed, and the light emitting diode in corresponding display panels broadcasting pictures zone is opened.
The light emitting diode of the light source 23,33 of this liquid crystal indicator 200,300 need not be in opening always, so power consumption is few.
Please refer to Fig. 7, is the running synoptic diagram of liquid crystal indicator the 4th embodiment of the present invention.Liquid crystal indicator 100 differences of this liquid crystal indicator 400 and first embodiment are: a plurality of light emitting diodes of the light source 43 of this liquid crystal indicator 400 are respectively adjacent in this light guide plate (figure does not show) two adjacent side settings, connect with plain conductor or flexible printed wiring board between the printed circuit board (PCB) 491,492 at a plurality of light emitting diodes difference place of this two adjacent side.
Please refer to Fig. 8, is the running synoptic diagram of liquid crystal indicator the 5th embodiment of the present invention.Liquid crystal indicator 100 difference of this liquid crystal indicator 500 and first embodiment is: a plurality of light emitting diodes of the light source 53 of this liquid crystal indicator 500 are respectively adjacent in this light guide plate (figure does not show) three sides and are arranged at printed circuit board (PCB) 591,592,593, are connected with plain conductor or flexible printed wiring board between printed circuit board (PCB) 591,593 and the printed circuit board (PCB) 592.
The light emitting diode that increases somes compared to the liquid crystal indicator 400,500 of the liquid crystal indicator 100, the four of first embodiment, the 5th embodiment can strengthen the luminance brightness of display panels 42,52.
Claims (10)
1. liquid crystal indicator, comprise a display panels, one sequential control circuit, one scan line drive circuit that is connected with this display panels, one light source that is provided with the light guide plate of the stacked setting of this display panels and contiguous this light guide plate side and the backlight drive circuit of this light source of control, this display panels comprises many sweep traces that are parallel to each other, this light source comprises a plurality of light emitting diodes, it is characterized in that: this sequential control circuit is used for receiving video signal and system's display mode signal and sends synchronous control signal according to its video signal that receives and system's display mode signal to this scan line drive circuit and this backlight drive circuit, and this scan line drive circuit and this backlight drive circuit are used for according to its synchronous control signal that receives driven in synchronism sweep trace and the on off state of controlling these a plurality of light emitting diodes respectively.
2. liquid crystal indicator as claimed in claim 1 is characterized in that: these a plurality of light emitting diodes are adjacent at least one side setting of this light guide plate.
3. liquid crystal indicator as claimed in claim 2 is characterized in that: this at least one side is vertical with sweep trace.
4. liquid crystal indicator as claimed in claim 1 is characterized in that: these a plurality of light emitting diodes are adjacent to the setting of dual-side at least of this light guide plate.
5. liquid crystal indicator as claimed in claim 1 is characterized in that: these a plurality of light emitting diodes are adjacent to three side settings of this light guide plate.
6. liquid crystal indicator method for controlling backlight thereof, this liquid crystal indicator comprises a display panels and a data line drive circuit that is connected with this display panels and one scan line drive circuit; One light source and a backlight drive circuit that is connected with this light source, this light source are to should the display panels setting, and it comprises a plurality of light emitting diodes; One sequential control circuit, this sequential control circuit are connected with data line drive circuit, scan line drive circuit and backlight drive circuit respectively; This method for controlling backlight thereof may further comprise the steps: sequential control circuit receiving video signal and system's display mode signal; Sequential control circuit sends synchronous control signal according to its video signal that receives and system's display mode signal to scan line drive circuit and backlight drive circuit; Scan line drive circuit and backlight drive circuit receive synchronous control signal and distinguish the sweep trace of this display panels of driven in synchronism and the on off state of control light emitting diode according to this synchronous control signal.
7. liquid crystal indicator method for controlling backlight thereof as claimed in claim 6, it is characterized in that: when this system's display mode is full screen display, the back lighting in the display panels zone of corresponding many continuous sweep line traffic controls of each light emitting diode, the pixel that is opened into this sweep trace when this zone article one sweep trace is enough charged and is discharged when arriving setting value, this light emitting diode is opened, at least until with next continuous regional article one sweep trace end of scan of this zone, this light emitting diode is closed, the rest may be inferred for the switch situation of next light emitting diode, shows until a frame picture and finish.
8. liquid crystal indicator method for controlling backlight thereof as claimed in claim 7 is characterized in that: this system's display mode is up and down during the black surround pattern, and the light emitting diode in corresponding display panels black surround zone is closed.
9. liquid crystal indicator method for controlling backlight thereof as claimed in claim 8, it is characterized in that: each light emitting diode in corresponding display panels broadcasting pictures zone, when its article one sweep trace in display panels zone of responsible back lighting open at least to next continuous regional article one sweep trace end of scan of this zone, this light emitting diode is closed.
10. liquid crystal indicator method for controlling backlight thereof as claimed in claim 7, it is characterized in that: when this system's display mode is left and right sides black surround pattern, the light emitting diode in corresponding display panels black surround zone is closed, and the light emitting diode in corresponding display panels broadcasting pictures zone is opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100600190A CN100498438C (en) | 2006-03-22 | 2006-03-22 | LCD device and its backlight control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100600190A CN100498438C (en) | 2006-03-22 | 2006-03-22 | LCD device and its backlight control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101042477A CN101042477A (en) | 2007-09-26 |
| CN100498438C true CN100498438C (en) | 2009-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100600190A Expired - Fee Related CN100498438C (en) | 2006-03-22 | 2006-03-22 | LCD device and its backlight control method thereof |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101352473B1 (en) * | 2009-12-11 | 2014-01-17 | 엘지디스플레이 주식회사 | Driving system for backlight unit, liquid crystal display device including the same and method of driving the same |
| CN102646397B (en) * | 2011-05-18 | 2013-10-16 | 京东方科技集团股份有限公司 | Method and device for scanning backlight |
| CN102244799A (en) * | 2011-06-14 | 2011-11-16 | 华映视讯（吴江）有限公司 | Display system of stereo image |
| CN103035217A (en) * | 2011-10-10 | 2013-04-10 | 吴小平 | Liquid crystal display panel of scanning type side light supplying Light-Emitting Diode (LED) backlight |
| TWI455100B (en) * | 2012-04-13 | 2014-10-01 | Wistron Corp | Backlight control method and backlight system |
| CN104143318A (en) * | 2013-05-07 | 2014-11-12 | 冠捷投资有限公司 | Multimedia display capable of improving contrast and reducing backlight power consumption |
| CN104332139B (en) * | 2013-07-22 | 2017-11-28 | 联想(北京)有限公司 | A kind of display device, electric terminal and method for controlling backlight thereof |
| CN104538002B (en) * | 2015-01-20 | 2017-07-28 | 京东方科技集团股份有限公司 | A kind of control method of direct-light-type backlight, control device and display device |
| CN104949009A (en) * | 2015-07-03 | 2015-09-30 | 深圳市华星光电技术有限公司 | LCD and backlight module thereof |
| CN105139808A (en) * | 2015-08-31 | 2015-12-09 | 小米科技有限责任公司 | Method and device for adjusting backlight display region |
| CN105810155A (en) * | 2016-05-10 | 2016-07-27 | 福建联迪商用设备有限公司 | Low-power-consumption liquid crystal display device backlight loop and control method thereof |
| TWI736209B (en) * | 2020-04-08 | 2021-08-11 | 香港商冠捷投資有限公司 | Backlight brightness control method and portable display |
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2006
- 2006-03-22 CN CNB2006100600190A patent/CN100498438C/en not_active Expired - Fee Related
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| CN101042477A (en) | 2007-09-26 |
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