CN102768826B - A kind of scanning backlight method and device - Google Patents
A kind of scanning backlight method and device Download PDFInfo
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- CN102768826B CN102768826B CN201110212862.7A CN201110212862A CN102768826B CN 102768826 B CN102768826 B CN 102768826B CN 201110212862 A CN201110212862 A CN 201110212862A CN 102768826 B CN102768826 B CN 102768826B
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Abstract
The invention provides a kind of scanning backlight method and device, described method comprises the steps:, 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, to open described backlight group; Before the next response cycle of the pixel liquid crystal of the adjacent area of described backlight group starts, close described backlight group.The present invention is by controlling the opening and closing time of backlight group, under the prerequisite ensureing scanning backlight sharpness, realize the scanning backlight technology based on the backlight of made of one piece light-guide device, solve the difficult problem that scanning backlight is applied at monoblock light-guide device, expand the range of application of scanning backlight.
Description
Technical field
The present invention relates to back light source technique field, particularly relate to a kind of scanning backlight method and device.
Background technology
Scanning backlight technology is that liquid crystal display is divided into multiple region according to horizontal zone, in arbitrary region, select to open or close backlight group in the position that liquid crystal response curve is suitable, as light emitting diode (LED) lamp group, slowly rise or the decline stage (hangover stage) when liquid crystal response curve is in, just close backlight, open backlight at liquid crystal response curve plateau.Scanning backlight technology can the sharpness of improving picture, alleviates hangover, improves contrast; And in order to make backlight while application scanning backlight technology, frivolous feature can be ensured again, adopt the scanning backlight technology of side-light type to become the focus of research.
In the application of side-light type scanning backlight technology, the light-guide device usually based on sectional type carries out scanning backlight, but sectional type light-guide device can be comparatively complicated in manufacture craft, and it is higher to realize cost; Therefore, the application of made of one piece light-guide device is more and more paid attention to.But, when application made of one piece light-guide device, larger difficult problem needs to ensure that other pixel liquid crystals that the light of backlight group irradiation area is not diffused into this light-guide device also do not respond in stable region, and then ensure the advantage 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, under the prerequisite ensureing scanning backlight sharpness, can realize the scanning backlight based on 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, described 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 described backlight group;
Before the next response cycle of the pixel liquid crystal of the adjacent area of described backlight group starts, close described backlight group;
Wherein, the corresponding region of described backlight group is region corresponding to backlight group level;
The adjacent area of described backlight group is upper one and/or region corresponding to next backlight group level with described backlight group.
Wherein, the backlight group of described side-light type back light is positioned at left side and/or the right side of made of one piece light-guide device.
Wherein, described backlight group is light emitting diode (LED) lamp group.
Further, after the corresponding region of the described backlight group at side-light type back light and the pixel liquid crystal response of adjacent area are stablized, opening described backlight group is:
The corresponding region of described backlight group, on the pixel liquid crystal response of and/or next backlight group corresponding region stable after, open described backlight group.
Further, before the next response cycle of the pixel liquid crystal of the described adjacent area in described backlight group starts, closing described backlight group is:
Described backlight group upper one or on before the next response cycle of pixel liquid crystal of corresponding region of several backlight group starts, close described backlight group.
A kind of scanning backlight device, comprise driving circuit, side-light type back light, described device also comprises: backlight control circuit; Wherein,
Described backlight control circuit, after stablizing for the corresponding region of the backlight group at side-light type back light and the pixel liquid crystal response of adjacent area and before the next response cycle of the pixel liquid crystal of the adjacent area of described backlight group starts, transmit control signal to driving circuit;
Described driving circuit, for according to the control signal received, opens or cuts out described backlight group;
The corresponding region of described backlight group is region corresponding to backlight group level;
The adjacent area of described backlight group is upper one and/or region corresponding to next backlight group level with described backlight group.
Further, described driving circuit, specifically for the corresponding region of described backlight group, on the pixel liquid crystal response of and/or next backlight group corresponding region stable after, open described backlight group; Described backlight group upper one or on before the next response cycle of pixel liquid crystal of corresponding region of several backlight group starts, close described backlight group.
A kind of liquid crystal indicator, described device comprises scanning backlight device as above.
The present invention is by controlling the opening and closing time of backlight group, under the prerequisite ensureing scanning backlight sharpness, realize the scanning backlight technology based on the backlight of made of one piece light-guide device, solve the difficult problem that scanning backlight is applied at monoblock light-guide device, expand the range of application of scanning backlight.
Accompanying drawing explanation
Fig. 1 is the structural representation of the side-light type back light that the present invention is based on made of one piece light-guide device;
Fig. 2 is the realization flow schematic diagram of scanning backlight method of the present invention;
The subregion schematic diagram of Fig. 3 corresponding backlight when being one group of LED group unlatching;
Fig. 4 is the fundamental diagram of the scanning backlight opening one group of LED group shown in Fig. 3;
Fig. 5 is the subregion schematic diagram of three groups of LED groups corresponding backlight when simultaneously opening;
Fig. 6 is for opening the fundamental diagram of the scanning backlight of three groups of LED groups simultaneously shown in Fig. 5.
Embodiment
Basic thought of the present invention is: after the correspondence of the backlight group of side-light type back light and the pixel liquid crystal response of adjacent area are stablized, open described backlight group; Before the pixel liquid crystal of the adjacent area of described backlight group starts next response cycle, close described backlight group.
For making the object, technical solutions and advantages of the present invention clearly understand, by the following examples also with reference to accompanying drawing, the present invention is described in more detail.
Fig. 1 shows the structure of the side-light type back light that the present invention is based on made of one piece light-guide device, and as shown in Figure 1, the backlight group of side-light type back light is the signal carried out with LED group; The left side is the vertical view of described backlight, and the right side is the sectional drawing of described backlight; Described backlight comprises: be positioned at the lamp batten 11 of the left and right sides, the some LED groups 12 be arranged on described lamp batten; In conjunction with sectional drawing, be wherein followed successively by upper frame 13, film material 14, made of one piece light guide plate 15, end reflector plate 16, backboard 17 from upper surface to lower surface in vertical view; Should be appreciated that here, LED 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 as shown in Figure 2, described method comprises the steps:
Step 201, after the pixel liquid crystal response of the corresponding region of backlight group and adjacent area is stable, opens described backlight group;
Particularly, the corresponding region of backlight group is region corresponding to backlight group level, and the adjacent area of backlight group is upper one and/or region corresponding to next backlight group level with described backlight group;
Here, can the corresponding region of described backlight group, on the pixel liquid crystal response of and/or next backlight group corresponding region stable after, open described backlight group; When backlight group is first group of backlight group, then, after the pixel liquid crystal response in 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 that backlight group is middle groups number, during as second group of backlight group, then, after the pixel liquid crystal response in first group of backlight group, second group of backlight group and the 3rd group of backlight group corresponding region is separately stable, open second group of backlight group; When backlight group is for last group backlight group, then after second from the bottom group of backlight group and the pixel liquid crystal response of last group backlight group corresponding region are separately stable, open last group backlight group.
Here, described backlight group is specifically as follows LED group.With reference to Fig. 3, left and right lamp batten suppose backlight is respectively arranged with eight groups of LED groups 2, then backlight can be eight regions according to the LED component of setting: 1 ~ region, region 8, and region corresponding to each LED group level is the corresponding region of LED group.
When the 4th group of LED group is opened, as shown in Figure 3, the 4th group of region that LED is corresponding 4 is the brightest region in the brightness of regional; The region 3 adjacent with described region 4 and region 5 are brighter region; From the region away from the 4th group of LED as region 2 and region 6 then brightness reduce further, it can be dark region, because the brightness in dark region is lower, the impact on backlight scanning effect can be ignored, therefore, in the embodiment of the present invention, can consider and the impact of opening adjacent two regions above and/or under LED group; Here, adjacent with first group of LED region is only region 2; The upper region that the adjacent region of LED is only last 1st district is organized with last.
With reference to Fig. 4, for the fundamental diagram that the backlight of subregion shown in Fig. 3 scans, horizontal axis plots time in Fig. 4, the longitudinal axis represents pixel liquid crystal, and in Fig. 4, grid is the response time of the pixel liquid crystal of zones of different, dash area is the opening time of LED group corresponding to zones of different, such as, after the pixel liquid crystal response in the 2nd district is stable, first group of LED group is opened, 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 the speed that each pixel of liquid crystal indicator reacts input signal, namely pixel is bright or by bright turn of dark required time by blackout, its principle is by applying voltage in liquid crystal cell, liquid crystal molecule is reversed and recovers, and then make the change 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 according to the size of backlight institute zoning and whole pixel liquid crystal, can calculate the pixel liquid crystal response stable required time in each region.
Step 202, before the next response cycle of the pixel liquid crystal of the adjacent area of described backlight group starts, closes described backlight group;
Here, the time of concrete closedown described backlight group can be any instant before the next response cycle arrival of the pixel liquid crystal of the backlight of the corresponding region of adjacent backlight group, usually, extend 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 defined as: after the pixel liquid crystal response in the next one of described backlight group or the corresponding region of lower several backlight group is stable, before the next response cycle of the pixel liquid crystal of the corresponding region of upper one or upper several backlight group of described backlight group starts, wherein, the opening time of backlight group is longer, then mean that the number of the backlight group of simultaneously opening is more, described backlight group is specifically as follows LED group, the signal for unlatching one group of LED group shown in Fig. 3 and Fig. 4, Fig. 5 and Fig. 6 then shows the signal of simultaneously opening three groups of LED groups.
As shown in Figure 5, when to open fourth, fifth, six groups of LED groups 12 simultaneously, then the region 4 that described LED group is corresponding, region 5, region 6 are bright region; Region 3, region 7 are brighter region; Region 2,8, region are dark region;
With reference to Fig. 5, after the pixel liquid crystal response of the last column in region 5 is stable, open the 4th group of LED group 12, and the pixel liquid crystal response being retained to the last column in region 8 is closed after stablizing; Period, the 5th, six group of LED group 12 is opened in succession, and second and third group LED group 12 is closed in succession; Namely after the pixel liquid crystal response of last column of region n is stable, open (n-1)th group of LED group 12, and last column pixel liquid crystal response being retained to region n+3 is closed after stablizing; So, then the backlight scanning simultaneously keeping three groups of LED groups 12 to open is achieved.
In addition, as seen from Figure 6, in the response cycle shown in Fig. 6, three groups of LED groups can be kept at most to open simultaneously, because when each response cycle in figure 6 often go last blank lattice time, the pixel liquid crystal in this region has started to enter next response cycle, is rendered as non-steady state, now needs to close LED group corresponding to this region.
Present invention also offers a kind of scanning backlight device, comprise driving circuit, side-light type back light, backlight control circuit; Wherein,
Described backlight control circuit, after stablizing for the corresponding region of the backlight group at side-light type back light and the pixel liquid crystal response of adjacent area and before the pixel liquid crystal of the adjacent area of described backlight group starts next response cycle, transmit control signal to driving circuit;
Described driving circuit, for according to the control signal received, opens or cuts out described backlight group;
Particularly, when described pixel liquid crystal starts to respond, the time schedule controller applying the liquid crystal indicator of this scanning backlight device can send a clock signal to backlight control circuit, after backlight control circuit receives this clock signal, calculate the pixel liquid crystal response stable required time of next backlight group corresponding region, after postponing the duration of described required time, transmit control signal to described driving circuit, controlled to open described backlight group by described driving circuit;
Backlight control circuit described backlight group upper one or on before the next response cycle of pixel liquid crystal of corresponding region of several backlight group starts, transmit control signal to described driving circuit, controlled to close described backlight group by described driving circuit.
Wherein, the backlight group of described side-light type back light is positioned at left side and/or the right side of made of one piece light-guide device; The response cycle of described pixel liquid crystal and the refreshing frequency of liquid crystal display reciprocal each other.
Wherein, the corresponding region of described backlight group is region corresponding to backlight group level; The adjacent area of described backlight group is upper one and/or region corresponding to next backlight group level with described backlight group; Described backlight group can be LED group.
Further, described driving circuit, specifically for the corresponding region of described backlight group, on the pixel liquid crystal response of and/or next backlight group corresponding region stable after, open described backlight group; After pixel liquid crystal response in the next one of described backlight group or the corresponding region of lower several backlight group is stable, described backlight group upper one or on before the next response cycle of pixel liquid crystal of corresponding region of several backlight group starts, close described backlight group.
Present invention also offers a kind of liquid crystal indicator, described liquid crystal indicator includes above-mentioned scanning backlight device.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (9)
1. a scanning backlight method, is characterized in that, described 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 described backlight group;
Before the next response cycle of the pixel liquid crystal of the adjacent area of described backlight group starts, close described backlight group, multiple described backlight group can be made simultaneously to be in opening;
Wherein, the corresponding region of described backlight group is region corresponding to backlight group level;
The adjacent area of described backlight group is upper one and/or region corresponding to next backlight group level with described backlight group.
2. method according to claim 1, is characterized in that, the backlight group of described side-light type back light is positioned at 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, described backlight group is LED lamp group.
4. the method according to any one of claims 1 to 3, is characterized in that, after the corresponding region of the described backlight group at side-light type back light and the pixel liquid crystal response of adjacent area are stablized, opening described backlight group is:
The corresponding region of described backlight group, on the pixel liquid crystal response of and/or next backlight group corresponding region stable after, open described backlight group.
5. the method according to any one of claims 1 to 3, is characterized in that, before the next response cycle of the pixel liquid crystal of the described adjacent area in described backlight group starts, closing described backlight group is:
Described backlight group upper one or on before the next response cycle of pixel liquid crystal of corresponding region of several backlight group starts, close described backlight group.
6. a scanning backlight device, comprises driving circuit, side-light type back light, it is characterized in that, described device also comprises: backlight control circuit; Wherein,
Described backlight control circuit, after stablizing for the corresponding region of the backlight group at side-light type back light and the pixel liquid crystal response of adjacent area and before the next response cycle of the pixel liquid crystal of the adjacent area of described backlight group starts, transmit control signal to driving circuit;
Described driving circuit, for the corresponding region of described backlight group, on the pixel liquid crystal response of and/or next backlight group corresponding region stable after, open described backlight group; Described backlight group upper one or on before the next response cycle of pixel liquid crystal of corresponding region of several backlight group starts, close described backlight group, multiple described backlight group can be made simultaneously to be in opening;
The corresponding region of described backlight group is region corresponding to backlight group level;
The adjacent area of described backlight group is upper one and/or region corresponding to next backlight group level with described backlight group.
7. device according to claim 6, is characterized in that, the backlight group of described side-light type back light is positioned at 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, described backlight group is LED group.
9. a liquid crystal indicator, is characterized in that, described device comprises the scanning backlight device as described in any one of claim 6 to 8.
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| CN103778898B (en) * | 2014-02-28 | 2016-07-06 | 帝豪电子（扬州）有限公司 | A kind of liquid crystal display LED backlight dynamic light adjustment device |
| CN103778899B (en) * | 2014-02-28 | 2016-08-24 | 帝豪电子（扬州）有限公司 | A kind of liquid crystal display LED backlight dynamic light adjustment method |
| TWI654592B (en) | 2017-07-31 | 2019-03-21 | 明基電通股份有限公司 | Image display method and display system |
| AU2018362024B2 (en) | 2017-11-02 | 2022-08-18 | Memed Diagnostics Ltd. | Cartridge and system for analyzing body liquid |
| CN108648706B (en) * | 2018-04-26 | 2021-05-18 | Oppo广东移动通信有限公司 | Liquid crystal display, method, apparatus and medium for controlling the same |
| CN114255709B (en) * | 2020-09-25 | 2023-07-07 | 京东方科技集团股份有限公司 | Backlight circuit, driving method thereof, display panel and display device |
| CN113035139A (en) * | 2021-03-19 | 2021-06-25 | Tcl华星光电技术有限公司 | Backlight driving circuit and liquid crystal display device |
| 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 |
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| CN101153991A (en) * | 2006-09-29 | 2008-04-02 | 启萌科技有限公司 | LCD device and its side light type back light module unit |
| CN101994995A (en) * | 2009-08-21 | 2011-03-30 | 喜星电子株式会社 | Light guide board and side lighting backlight source device using the same |
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