CN102768826A - Scanning backlight method and scanning backlight device - Google Patents
Scanning backlight method and scanning backlight device Download PDFInfo
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- CN102768826A CN102768826A CN2011102128627A CN201110212862A CN102768826A CN 102768826 A CN102768826 A CN 102768826A CN 2011102128627 A CN2011102128627 A CN 2011102128627A CN 201110212862 A CN201110212862 A CN 201110212862A CN 102768826 A CN102768826 A CN 102768826A
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Abstract
The invention provides a scanning backlight method and a scanning backlight device. The method includes the steps: turning on a backlight set after stabilizing response of pixel liquid crystal of corresponding areas and adjacent areas of the backlight set with a side-light type backlight source; and turning off the backlight set before starting a next response period of the pixel liquid crystal of the adjacent areas of the backlight set. By controlling turn-on and turn-off time of the backlight set, on the premise of ensuring scanning backlight definition, the scanning backlight technology of the backlight source based on a whole light guide element is realized, the problem of difficulty in applying scanning backlight to the whole light guide element is solved, and the application range of the scanning backlight is widened.
Description
Technical field
The present invention relates to the backlight technical field, relate in particular to a kind of scanning backlight method and device.
Background technology
The scanning backlight technology is that LCD is divided into a plurality of zones according to horizontal zone; In arbitrary region; Suitable position opens or closes the backlight group to be chosen in the liquid crystal response curve, like light emitting diode (LED) lamp group, when the liquid crystal response curve is in slow rising or decline stage (hangover stage); Just close backlight, open backlight at liquid crystal response curve plateau.The scanning backlight technology can promote the sharpness of picture, alleviates hangover, improves contrast; And, can guarantee frivolous characteristics again in order to make backlight in the application scanning backlight technology, the scanning backlight technology of employing side-light type becomes the focus of research.
In side-light type scanning backlight technical application, the light-guide device based on sectional type carries out scanning backlight usually, but the sectional type light-guide device can be comparatively complicated on manufacture craft, and realizes that cost is higher; Therefore, the application of made of one piece light-guide device obtains increasing attention.Yet; When using the made of one piece light-guide device; Bigger difficult problem is that other pixel liquid crystals that the light that needs to guarantee backlight group irradiation area is not diffused into this light-guide device also do not respond in the stable zone, and then guarantees the advantages such as image sharpness of scanning backlight.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of scanning backlight method and device, can under the prerequisite that guarantees the scanning backlight sharpness, realize the scanning backlight based on the made of one piece light-guide device.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of scanning backlight method, said method comprises:
After the pixel liquid crystal response of the corresponding region of the backlight group of side-light type back light and adjacent area is stable, open said backlight group;
Before the next response cycle of the pixel liquid crystal of the adjacent area of said backlight group begins, close said backlight group;
Wherein, the corresponding region of said backlight group is the corresponding zone of backlight group level;
The adjacent area of said backlight group is last and/or the corresponding zone of next backlight group level with said backlight group.
Wherein, the backlight group of said side-light type back light is positioned at the left side and/or the right side of made of one piece light-guide device.
Wherein, said backlight group is light emitting diode (LED) lamp group.
Further, after the corresponding region of said backlight group at side-light type back light and the response of the pixel liquid crystal of adjacent area are stable, open said backlight group and be:
The corresponding region of said backlight group, on the pixel liquid crystal response of and/or next backlight group corresponding region stable after, open said backlight group.
Further, before the next response cycle of the pixel liquid crystal of said adjacent area in said backlight group begins, close said backlight group and be:
On the said backlight group one or on before the next response cycle of pixel liquid crystal of corresponding region of several backlight groups begins, close said backlight group.
A kind of scanning backlight device comprises driving circuit, side-light type back light, and said device also comprises: backlight control circuit; Wherein,
Said backlight control circuit; Be used for transmitting control signal to driving circuit in the stable back of pixel liquid crystal response of the corresponding region of the backlight group of side-light type back light and adjacent area and before the next response cycle of pixel liquid crystal of the adjacent area of said backlight group begins;
Said driving circuit is used for opening or cut out said backlight group according to the control signal that receives;
The corresponding region of said backlight group is the corresponding zone of backlight group level;
The adjacent area of said backlight group is last and/or the corresponding zone of next backlight group level with said backlight group.
Further, said backlight source driving circuit, specifically be used in said backlight group the corresponding region, on the pixel liquid crystal response of and/or next backlight group corresponding region stable after, open said backlight group; On the said backlight group one or on before the next response cycle of pixel liquid crystal of corresponding region of several backlight groups begins, close said backlight group.
A kind of liquid crystal indicator, said device comprise aforesaid scanning backlight device.
The present invention is through the opening and closing time of control backlight group; Under the prerequisite that guarantees the scanning backlight sharpness; Realization has solved the difficult problem that scanning backlight is used at the monoblock light-guide device based on the scanning backlight technology of the backlight of made of one piece light-guide device, has enlarged the range of application of scanning backlight.
Description of drawings
Fig. 1 is the structural representation that the present invention is based on the side-light type back light of made of one piece light-guide device;
Fig. 2 is the realization flow synoptic diagram of scanning backlight method of the present invention;
The subregion synoptic diagram of corresponding backlight when Fig. 3 is one group of LED lamp group unlatching;
Fig. 4 is the fundamental diagram of the scanning backlight of one group of LED lamp of unlatching shown in Figure 3 group;
Fig. 5 is the subregion synoptic diagram of three groups of LED lamp groups corresponding backlight when opening simultaneously;
Fig. 6 is a fundamental diagram of opening the scanning backlight of three groups of LED lamp groups simultaneously shown in Figure 5.
Description of reference numerals: 11-lamp batten; 12-LED lamp group; The 13-upper frame; 14-film material; 15-made of one piece LGP; Reflector plate at the bottom of the 16-; The 17-backboard.
Embodiment
Basic thought of the present invention is: after the pixel liquid crystal response of the correspondence of the backlight group of side-light type back light and adjacent area is stable, open said backlight group; Before the pixel liquid crystal of the adjacent area of said backlight group begins next response cycle, close said backlight group.
For making the object of the invention, technical scheme and advantage clearer, below lift embodiment and with reference to accompanying drawing, to further explain of the present invention.
Fig. 1 shows the structure of the side-light type back light that the present invention is based on the made of one piece light-guide device, and is as shown in Figure 1, and the backlight group of side-light type back light is the signal of carrying out with LED lamp group; The left side is the vertical view of said backlight, and the right side is the sectional drawing of said backlight; Said backlight comprises: be positioned at the left and right sides lamp batten 11, be arranged at the some LED lamp groups 12 on the said lamp batten; In conjunction with sectional drawing, wherein be followed successively by upper frame 13, film material 14, made of one piece LGP 15, end reflector plate 16, backboard 17 from upper surface to lower surface in the vertical view; Should be appreciated that here LED lamp group 12 can be arranged at left lamp batten and/or right lamp batten.
Fig. 2 shows the realization flow of backlight scanning method of the present invention, and is as shown in Figure 2, and said method comprises the steps:
Step 201 after the pixel liquid crystal response of the corresponding region of backlight group and adjacent area is stable, is opened said backlight group;
Particularly, the corresponding region of backlight group is the corresponding zone of backlight group level, and the adjacent area of backlight group is last and/or the corresponding zone of next backlight group level with said backlight group;
Here, can the corresponding region of said backlight group, on the pixel liquid crystal response of and/or next backlight group corresponding region stable after, open said backlight group; When the backlight group is first group of backlight group, then after the pixel liquid crystal response of the corresponding region of first group of backlight group and second group of backlight group is stable, open first group of backlight group; When the backlight group is the backlight group of middle groups number, during like second group of backlight group, then after the pixel liquid crystal response of first group of backlight group, second group of backlight group and the 3rd group of backlight group corresponding region separately is stable, open second group of backlight group; When the backlight group is organized backlight group for last, then after the pixel liquid crystal response of second from the bottom group of backlight group and last group backlight group corresponding region separately is stable, opens last and organize the backlight group.
Here, said backlight group specifically can be LED lamp group.With reference to Fig. 3, suppose to be respectively arranged with eight groups of LED lamp groups 2 on the left and right sides lamp batten of backlight, then backlight can be eight zones according to the LED lamp component that is provided with: zone 1～zone 8, the corresponding zone of each LED lamp group level is the corresponding region of LED lamp group.
When the 4th group of LED lamp group opened, each regional brightness was as shown in Figure 3, and the 4th group of corresponding zone 4 of LED is the brightest zone; With said regional 4 adjacent areas 3 be brighter zone with zone 5; From the 4th group of zone that LED is far away as zone 2 and zone 6 then brightness further reduce; Can be dark zone; Because the brightness in dark zone is lower, can ignore the influence to scanning effect backlight, therefore; In the embodiment of the invention, can consider that the influence in adjacent two zones above and/or under unlatching LED lamp group gets final product; Here, be merely zone 2 with first group of LED adjacent areas; Organize the last zone that the LED adjacent areas is merely last 1 district with last.
With reference to Fig. 4, be the fundamental diagram of the scanning backlight of subregion shown in Figure 3, transverse axis is represented the time among Fig. 4; Longitudinal axis represent pixel liquid crystal, grid is the response time of the pixel liquid crystal of zones of different among Fig. 4, dash area is the opening time of the corresponding LED lamp group of zones of different; For example, after the pixel liquid crystal response in the 2nd district is stable, open first group of LED lamp group; By that analogy, repeat no more; Here, the response cycle of the pixel liquid crystal of this backlight is the inverse of the refreshing frequency of liquid crystal display;
Wherein, The response time of liquid crystal is each pixel of liquid crystal indicator to the speed of input signal reaction, and promptly pixel is bright or by the dark needed time of bright commentaries on classics, its principle is through in liquid crystal cell, applying voltage by blackout; Liquid crystal molecule is reversed and recover; And then make the variation of pixel generation light and shade, therefore, the response time of general pixel liquid crystal is one of property parameters of liquid crystal indicator; And backlight control circuit can calculate each regional pixel liquid crystal response and stablize the required time according to the size of backlight institute zoning and whole pixel liquid crystal.
Here; Arbitrary moment before the time of specifically closing said backlight group can arrive for the next response cycle of the pixel liquid crystal of the backlight of the corresponding region of adjacent backlight group; Usually; Prolong the opening time of each backlight group as far as possible; To improve the utilization factor of backlight, the concrete shut-in time can be confirmed as: on the stable back of pixel liquid crystal the response next or corresponding region of several backlight groups down of said backlight group, the said backlight group one or on before the next response cycle of pixel liquid crystal of corresponding region of several backlight groups begins; Wherein, The opening time of backlight group is long more, means that then the number of the backlight group of opening simultaneously is many more, and said backlight group specifically can be LED lamp group; The signal for one group of LED lamp group of unlatching shown in Fig. 3 and Fig. 4, Fig. 5 and Fig. 6 then show the signal of opening three groups of LED lamp groups simultaneously.
As shown in Figure 5, when opening fourth, fifth, six group of LED lamp group 12 simultaneously, corresponding zone 4, zone 5, the zone 6 of then said LED lamp group is bright zone; Zone 3, zone 7 are brighter zone; Zone 2,8 in zone are dark zone;
With reference to Fig. 5, after the pixel liquid crystal response of zone last column of 5 is stable, open the 4th group of LED lamp group 12, and be retained to the pixel liquid crystal response of last column in zone 8 and close after stable; During this time, the 5th, six group of LED lamp group 12 opened in succession, and second and third group LED lamp group 12 is closed in succession; Promptly after the pixel liquid crystal response of last column of regional n is stable, open n-1 group LED lamp group 12, and be retained to last column pixel liquid crystal response of regional n+3 and close after stable; So, then realized keeping simultaneously the scanning backlight of three groups of LED lamp groups, 12 unlatchings.
In addition; Can find out by Fig. 6, in response cycle shown in Figure 6, can keep three groups of LED lamp groups to open at most simultaneously; Because when last blank lattice of every row of each response cycle in Fig. 6; This regional pixel liquid crystal has begun to get into next response cycle, is rendered as non-steady state, need close the corresponding LED lamp group in this zone this moment.
The present invention also provides a kind of scanning backlight device, comprises driving circuit, side-light type back light, backlight control circuit; Wherein,
Said backlight control circuit; Be used for transmitting control signal to driving circuit in the stable back of pixel liquid crystal response of the corresponding region of the backlight group of side-light type back light and adjacent area and before the pixel liquid crystal of the adjacent area of said backlight group begins next response cycle;
Said driving circuit is used for opening or cut out said backlight group according to the control signal that receives;
Particularly; When said pixel liquid crystal began to respond, the time schedule controller of using the liquid crystal indicator of this scanning backlight device can send a clock signal and give backlight control circuit, after backlight control circuit receives this clock signal; The pixel liquid crystal response that calculates next backlight group corresponding region is stablized the required time; After postponing the duration of said required time, transmit control signal, open said backlight group by said driving circuit control to said driving circuit;
Backlight control circuit on the said backlight group one or on before the next response cycle of pixel liquid crystal of corresponding region of several backlight groups begins, transmit control signal to said driving circuit, close said backlight group by said driving circuit control.
Wherein, the backlight group of said side-light type back light is positioned at the left side and/or the right side of made of one piece light-guide device; The response cycle of said pixel liquid crystal and the refreshing frequency of liquid crystal display are reciprocal each other.
Wherein, the corresponding region of said backlight group is the corresponding zone of backlight group level; The adjacent area of said backlight group is last and/or the corresponding zone of next backlight group level with said backlight group; Said backlight group can be LED lamp group.
Further, said backlight source driving circuit, specifically be used in said backlight group the corresponding region, on the pixel liquid crystal response of and/or next backlight group corresponding region stable after, open said backlight group; The next of said backlight group or down the corresponding region of several backlight groups the stable back of pixel liquid crystal response, said backlight group on one or on before the next response cycle of pixel liquid crystal of corresponding region of several backlight groups begins, close said backlight group.
The present invention also provides a kind of liquid crystal indicator, and said liquid crystal indicator includes above-mentioned scanning backlight device.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.
Claims (10)
1. a scanning backlight method is characterized in that, said method comprises:
After the pixel liquid crystal response of the corresponding region of the backlight group of side-light type back light and adjacent area is stable, open said backlight group;
Before the next response cycle of the pixel liquid crystal of the adjacent area of said backlight group begins, close said backlight group;
Wherein, the corresponding region of said backlight group is the corresponding zone of backlight group level;
The adjacent area of said backlight group is last and/or the corresponding zone of next backlight group level with said backlight group.
2. method according to claim 1 is characterized in that, the backlight group of said side-light type back light is positioned at the left side and/or the right side of made of one piece light-guide device.
3. method according to claim 1 is characterized in that, said backlight group is a LED lamp group.
4. according to each described method of claim 1 to 3, it is characterized in that, after the corresponding region of said backlight group at side-light type back light and the response of the pixel liquid crystal of adjacent area are stable, open said backlight group and be:
The corresponding region of said backlight group, on the pixel liquid crystal response of and/or next backlight group corresponding region stable after, open said backlight group.
5. according to each described method of claim 1 to 3, it is characterized in that, before the next response cycle of the pixel liquid crystal of said adjacent area in said backlight group begins, close said backlight group and be:
On the said backlight group one or on before the next response cycle of pixel liquid crystal of corresponding region of several backlight groups begins, close said backlight group.
6. a scanning backlight device comprises driving circuit, side-light type back light, it is characterized in that, said device also comprises: backlight control circuit; Wherein,
Said backlight control circuit; Be used for transmitting control signal to driving circuit in the stable back of pixel liquid crystal response of the corresponding region of the backlight group of side-light type back light and adjacent area and before the next response cycle of pixel liquid crystal of the adjacent area of said backlight group begins;
Said driving circuit is used for opening or cut out said backlight group according to the control signal that receives;
The corresponding region of said backlight group is the corresponding zone of backlight group level;
The adjacent area of said backlight group is last and/or the corresponding zone of next backlight group level with said backlight group.
7. device according to claim 6 is characterized in that, the backlight group of said side-light type back light is positioned at the left side and/or the right side of made of one piece light-guide device.
8. device according to claim 6 is characterized in that, said backlight group is a LED lamp group.
9. according to each described device of claim 6 to 8; It is characterized in that; Said backlight source driving circuit, specifically be used in said backlight group the corresponding region, on the pixel liquid crystal response of and/or next backlight group corresponding region stable after, open said backlight group; On the said backlight group one or on before the next response cycle of pixel liquid crystal of corresponding region of several backlight groups begins, close said backlight group.
10. a liquid crystal indicator is characterized in that, said device comprises like each described scanning backlight device of claim 6 to 9.
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| CN103778899A (en) * | 2014-02-28 | 2014-05-07 | 帝豪电子（扬州）有限公司 | Dynamic dimming method of liquid crystal display LED backlight |
| CN103778898A (en) * | 2014-02-28 | 2014-05-07 | 帝豪电子（扬州）有限公司 | Dynamic dimming method of liquid crystal display LED backlight |
| CN108648706A (en) * | 2018-04-26 | 2018-10-12 | Oppo广东移动通信有限公司 | Liquid crystal display and its control method, equipment and medium |
| TWI654592B (en) | 2017-07-31 | 2019-03-21 | 明基電通股份有限公司 | Image display method and display system |
| CN113362776A (en) * | 2021-06-30 | 2021-09-07 | 北京京东方光电科技有限公司 | Field sequence display device, control method and display equipment |
| CN114255709A (en) * | 2020-09-25 | 2022-03-29 | 京东方科技集团股份有限公司 | Backlight circuit, driving method thereof, display panel and display device |
| WO2022193359A1 (en) * | 2021-03-19 | 2022-09-22 | Tcl华星光电技术有限公司 | Backlight driving circuit and liquid crystal display device |
| US11883825B2 (en) | 2017-11-02 | 2024-01-30 | Memed Diagnostics Ltd. | Cartridge and system for analyzing body liquid |
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| CN103778899A (en) * | 2014-02-28 | 2014-05-07 | 帝豪电子（扬州）有限公司 | Dynamic dimming method of liquid crystal display LED backlight |
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