CN103377636B - Method for regulating back light brightness - Google Patents
Method for regulating back light brightness Download PDFInfo
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- CN103377636B CN103377636B CN201310186345.6A CN201310186345A CN103377636B CN 103377636 B CN103377636 B CN 103377636B CN 201310186345 A CN201310186345 A CN 201310186345A CN 103377636 B CN103377636 B CN 103377636B
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Abstract
The invention discloses a method for regulating the back light brightness. The method includes the steps that after a light source sensing module senses that brightness of an outside light source changes essentially, whether the light source sensing module is in a triggering mode is detected; if the light source sensing module is in the triggering mode, an interrupt signal is sent to a controller; the controller instructs the light source sensing module to cancel the triggering mode; the controller enters a polling mode; when the controller is in the polling mode, the light source sensing module detects the brightness of the outside light source a plurality of times to generate a plurality of brightness values of the outside light source; according to the brightness values of the outside light source and a brightness value before that the brightness of the outside light source changes essentially, the changing conditions of the outside light source are judged; if the outside light source does not change essentially, the controller instructs the light source sensing module to enter the triggering mode; if the outside light source changes essentially, a light source input value is generated according to the brightness values of the outside light source and the brightness value before that the brightness of the outside light source changes essentially.
Description
The present invention is application number is 201010188896.2, and the applying date is 2010.5.25, and denomination of invention is the divisional application of the patented claim of " method of the brightness of adjustment backlight ".
Technical field
The present invention has about a kind of method adjusting the brightness of backlight, and the brightness of espespecially a kind of environmentally light source and liquid crystal panel display adjusts the method for the brightness of backlight automatically.
Background technology
Liquid crystal panel is the display device of non-luminescent, just need have the function of display image with backlight.The brightness of liquid crystal panel refers to the light levels of picture, and rational brightness can make our eyes more comfortable, also can not affect the color representation of picture simultaneously.In general, too high brightness easily causes the visual fatigue of user, and also can affect the color range of liquid crystal panel and the performance of GTG, and the brightness of liquid crystal panel display is higher, and the color of just easier desalination solution crystal panel display, causes picture partially white.
For example, the brightness of a lot of liquid crystal panel display now can reach 1000 lumens, 2000 lumens, and higher not the showing of brightness of liquid crystal panel display is in fact better.With regard to actual service condition, 50% of the high-high brightness that the brightness adjustment of liquid crystal panel display can export at backlight is proper.The brightness of liquid crystal panel display is too high, just likely starts to affect the color representation of picture shown on liquid crystal panel.
Therefore, industry member starts to develop the technology that automatically can adjust back light source brightness according to background luminance.When the brightness of environment has variation, liquid crystal panel automatically can adjust the brightness of backlight.So user can not feel that the brightness that liquid crystal panel shows is too dark or too bright, but the brightness felt comfortably cool.In addition, also by the brightness automatically adjusting backlight, the function of power saving can be reached.
But prior art has many shortcomings.For example, the change of the brightness possibility too frequent of liquid crystal panel display, or the brightness of liquid crystal panel display changes suddenly.Though be liquid crystal panel display brightness too frequent change or change suddenly, user all can be caused visual uncomfortable.
Summary of the invention
One embodiment of the invention disclose a kind of method adjusting the brightness of backlight, comprise detection one image signal source at present, to obtain the digital averaging brightness value of picture to display; A brightness stage of reaction number is produced according to this digital averaging brightness value; And according to the desired value of a backlight and this brightness stage of reaction number, adjust the brightness of this backlight.
Another embodiment of the present invention discloses a kind of method adjusting the brightness of backlight, comprises after the brightness sensing an external light source produces substantial change, detects repeatedly the brightness of this external light source to produce multiple external light source brightness value; Brightness value when not yet producing substantial change according to the brightness of the plurality of external light source brightness value and this external light source, infers and rational external light source situation of change and light-source brightness value; And according to infer the external light source brightness value, decide the desired value of this backlight.
Another embodiment of the present invention discloses a kind of method adjusting the brightness of backlight, comprises after the brightness sensing an external light source when a light source induction module produces substantial change, detects this light source induction module and whether be in a trigger mode; If this light source induction module is in a trigger mode, send look-at-me to controller; This controller notifies that this light source induction module cancels this trigger mode; This controller enters a poll pattern; When this controller is in this poll pattern, this light source induction module detects repeatedly the brightness of this external light source to produce multiple external light source brightness value; And brightness value when not yet producing substantial change according to the brightness of the plurality of external light source brightness value and this external light source, infer and rational external light source brightness value and external light source changing condition.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that liquid crystal display systems is described;
Fig. 2 is a kind of process flow diagram adjusting the method for the brightness of backlight disclosed in one embodiment of the invention;
Fig. 3 is the schematic diagram that the digital averaging brightness value of picture and the relation of brightness stage of reaction number are described;
Fig. 4 is a kind of process flow diagram adjusting the method for the brightness of backlight disclosed in another embodiment of the present invention;
Fig. 5 is the schematic diagram of the relation that external light source changing pattern and light source input value are described;
Fig. 6 is a kind of process flow diagram adjusting the method for the brightness of backlight disclosed in another embodiment of the present invention;
Fig. 7 A and Fig. 7 B is a kind of process flow diagram adjusting the method for the brightness of backlight disclosed in another embodiment of the present invention;
Fig. 8 A and Fig. 8 B is a kind of process flow diagram adjusting the method for the brightness of backlight disclosed in another embodiment of the present invention.
Wherein, Reference numeral:
100 liquid crystal display systemss
102 light source induction modules
104 controllers
106 backlight control modules
108 human-machine interface modules
200-210,400-416,600-618,700-728,800-828 step
Embodiment
The invention relates to that a kind of brightness shown by environment light source and liquid crystal panel adjusts the method for the brightness of backlight automatically.The present invention mainly adopts on liquid crystal display systems.Please refer to Fig. 1, Fig. 1 is the schematic diagram that liquid crystal display systems 100 is described.Liquid crystal display systems 100 comprises light source induction module 102, controller 104, backlight control module 106 and a human-machine interface module 108.Light source induction module 102 is coupled to controller 104, in order to sense the brightness of external light source and to transmit suitable light source input value to controller 104.Controller 104 is coupled to backlight control module 106 and human-machine interface module 108, in order to detect current image signal source, to obtain the digital averaging brightness value of picture to display; Brightness stage of reaction number is produced according to the digital averaging brightness value of picture; What provide according to suitable light source input value and human-machine interface module 108 maximumly presents brightness value and the minimum setting presenting brightness value, to determine the desired value of backlight; Control backlight control module 106 to adjust the brightness of backlight.Backlight control module 106 is in order to receive the control signal of controller 104 to adjust the brightness of backlight.What human-machine interface module 108 set backlight via user maximumly presents brightness value and minimumly presents brightness value.
Please refer to Fig. 2 and Fig. 3.Fig. 2 is a kind of process flow diagram adjusting the method for the brightness of backlight disclosed in one embodiment of the invention, and Fig. 3 is the schematic diagram that the digital averaging brightness value of picture and the relation of brightness stage of reaction number are described.The method mat liquid crystal display systems 100 as shown in Figure 1 of Fig. 2 illustrates, details are as follows for its step:
Step 200: start;
Step 202: detect current picture signal, to obtain the digital averaging brightness value of picture to display;
Step 204: produce brightness stage of reaction number according to the digital averaging brightness value of picture;
Step 206: present brightness value according to the maximum of setting and minimumly present brightness value, determining the desired value of backlight;
Step 208: according to desired value and the brightness stage of reaction number of backlight, the brightness of adjustment backlight;
Step 210: terminate.
In the embodiment of fig. 2, step 202, controller 104 detects current image signal source, to obtain the digital averaging brightness value of picture to display; Step 204, controller 104 produces brightness stage of reaction number according to the digital averaging brightness value of picture.In step 206, what user then set backlight by human-machine interface module 108 maximumly presents brightness value and minimumly presents brightness value, what such as user can set backlight minimumly presents brightness value and maximumly presents brightness value, wherein minimumly present brightness value and the maximum high-high brightness of representation for presenting relative to backlight presenting brightness value, the high-high brightness that such as can present with backlight is used as 100%, the minimum brightness value that presents is 40% (cold-cathode tube backlight) or 20% (back light source in LED), but the present invention is not limited to this, maximumly present brightness value then according to the visual custom of user, usually between 50%-100%.
When determine backlight minimum present brightness value and maximum present brightness value after, then controller 104 can be determined the desired value BLT of backlight by formula (1).
BLT=min+60%*ES (1)
Wherein ES the maximum of backlight set by user presents brightness value, and min is that the minimum of backlight presents brightness value (for example: cold-cathode tube backlight is 40%, back light source in LED is 20%).For example, the maximum brightness value ES that presents that user sets cold-cathode tube backlight is 70%, then the desired value BLT=40%+60%*70%=82% of backlight.
In a step 208, the desired value of the backlight that controller 104 obtains according to formula (1) and the brightness stage of reaction number obtained in step 204, control backlight control module 106 to adjust the brightness of backlight.In addition, controller 104 controls backlight control module 106 to adjust the pattern of the brightness of backlight, is the brightness of each luminescence unit in adjustment backlight, or closes and/or open the part luminescence unit of backlight.
In addition as shown in Figure 3, when the digital averaging brightness value of picture is brighter, brightness stage of reaction number is more, that is, when the digital averaging brightness value of picture is brighter, the brightness of adjustment backlight needs more reaction time (brightness stage of reaction number is more), to avoid the rapid change of the brightness of backlight, causes the visual discomfort of user.
Fig. 4 is a kind of process flow diagram adjusting the method for the brightness of backlight disclosed in another embodiment of the present invention.The method mat liquid crystal display systems 100 as shown in Figure 1 of Fig. 4 illustrates, details are as follows for its step:
Step 400: start;
Step 402: detect current picture signal, to obtain the digital averaging brightness value of picture to display;
Step 404: produce brightness stage of reaction number according to the digital averaging brightness value of picture;
Step 406: detect the brightness of external light source to obtain the original luminance value of external light source;
Step 408: after the brightness sensing external light source produces substantial variations, the brightness of continuous detecting external light source is to produce the external light source brightness value of at least three changes;
Step 410: according to the external light source brightness value of three changes and the original luminance value of external light source, judge the changing condition of external light source, and determine suitable light source input value LS;
Step 412: according to light source input value LS, determines the desired value of backlight;
Step 414: according to desired value and the brightness stage of reaction number of backlight, the brightness of adjustment backlight;
Step 416: terminate.
In the fig. 4 embodiment, step 402, step 404 and step 202, step 204 are identical, do not repeat them here.In a step 406, light source induction module 102 detects the brightness of external light source to obtain the original luminance value of external light source.In a step 408, after light source induction module 102 senses the change of brightness generation essence of external light source, the brightness of continuous detecting external light source is to produce external light source brightness value L ux1, Lux2 and Lux3 of at least three changes.In step 410, the light source input value of the original luminance value LS0(such as last time of external light source brightness value L ux1, Lux2 and Lux3 and external light source that light source induction module 102 utilizes three to change), then the changing condition of external light source is judged according to the external light source changing pattern of Fig. 5, to determine suitable light source input value LS.Such as, external light source brightness value L ux1, Lux2 and Lux3 of original luminance value LS0 and three change of external light source present ascendant trend, that is LS0<Lux1<Lux2<Lux 3, be then set to Lux3 by light source input value LS.In addition, if external light source brightness value L ux1, Lux2 and Lux3 of the original luminance value LS0 and three of external light source change present downtrending, that is LS0>Lux1>Lux2> Lux3, be then set to Lux3 by light source input value LS.If external light source brightness value L ux1, Lux2 and Lux3 of the original luminance value LS0 and three of external light source change present irregular alteration trend, then light source input value LS is set to (Lux1+Lux2+Lux3)/3.
In step 412, after determining suitable light source input value LS, then controller 104 can be determined the desired value BLT of backlight by formula (2).
BLT=min+60%*LS (2)
Wherein min is that the minimum of backlight presents brightness value (for example: cold-cathode tube backlight is 40%, back light source in LED is 20%).For example, when suitable light source input value LS is 70% and backlight is cold-cathode tube, then the desired value BLT=40%+60%*70%=82% of backlight.
In step 414, the desired value of the backlight that controller 104 obtains according to formula (2) and the brightness stage of reaction number obtained in step 404, control backlight control module 106 to adjust the brightness of backlight.In addition, controller 104 controls backlight control module 106 to adjust the pattern of the brightness of backlight, identical with the embodiment of Fig. 2, does not repeat them here.
Fig. 6 is a kind of process flow diagram adjusting the method for the brightness of backlight disclosed in another embodiment of the present invention.The method mat liquid crystal display systems 100 as shown in Figure 1 of Fig. 6 illustrates, details are as follows for its step:
Step 600: start;
Step 602: detect current picture signal, to obtain the digital averaging brightness value of picture to display;
Step 604: produce brightness stage of reaction number according to the digital averaging brightness value of picture;
Step 606: detect the brightness of external light source to produce the original luminance value of external light source;
Step 608: after the brightness sensing external light source produces substantial variations, the brightness of continuous detecting external light source is to produce the external light source brightness value of at least three changes;
Step 610: according to the original luminance value of three external light source brightness values and external light source, judge the changing condition of external light source, and determine suitable light source input value LS;
Step 612: provide predetermined and maximumly present brightness value and minimumly present brightness value;
Step 614: according to light source input value LS and predetermined maximumly present brightness value and minimumly present brightness value, determines the desired value of backlight;
Step 616: according to desired value and the brightness stage of reaction number of backlight, the brightness of adjustment backlight;
Step 618: terminate.
The embodiment of Fig. 6 and the embodiment difference of Fig. 4 are in step 610, controller 104 be provide via light source input value LS and human-machine interface module 108 maximumly present brightness value and the minimum setting presenting brightness value substitutes into formula (3), decide the desired value of backlight, all the other steps are identical with the embodiment of Fig. 4, do not repeat them here.
BLT=min+60%*ES*LS (3)
Wherein ES backlight maximum set by user presents brightness value (human-machine interface module 108 provide maximum present brightness value), min is that the minimum of backlight presents brightness value (for example: cold-cathode tube backlight is 40%, back light source in LED is 20%).For example, the maximum brightness value ES that presents that user sets cold-cathode tube backlight is 70%, if when suitable light source input value LS is 80%, then and the desired value BLT=40%+60%*70%*80%=73.6% of backlight.
Fig. 7 A and Fig. 7 B is disclosed a kind of process flow diagram adjusting the method for the brightness of backlight in another embodiment of the present invention.The method mat liquid crystal display systems 100 as shown in Figure 1 of Fig. 7 A and Fig. 7 B illustrates, details are as follows for its step:
Step 700: start;
Step 702: detect current picture signal, to obtain the digital averaging brightness value of picture to display;
Step 704: produce brightness stage of reaction number according to the digital averaging brightness value of picture;
Step 706: detect the brightness of external light source to obtain the original luminance value of external light source;
Step 708: after the brightness sensing external light source produces substantial variations, detect whether be in trigger mode, if so, carry out step 710; If not, step 728 is skipped to;
Step 710: send look-at-me;
Step 712: cancel trigger mode;
Step 714: enter external light source poll pattern;
Step 716: when being in external light source poll pattern, starts the brightness of continuous detecting external light source to produce the external light source brightness value of at least three changes;
Step 718: according to the external light source brightness value of three changes and the original luminance value of external light source, judge whether the changing condition of external light source is fixing, if so, carry out step 720; If not, step 722 is skipped to;
Step 720: enter trigger mode, skips to step 728;
Step 722: according to the external light source brightness value of three changes and the original luminance value of external light source, determine suitable light source input value LS;
Step 724: according to light source input value LS, determines the desired value of backlight;
Step 726: according to desired value and the brightness stage of reaction number of backlight, the brightness of adjustment backlight;
Step 728: terminate.
The embodiment of Fig. 7 A and Fig. 7 B and the embodiment difference of Fig. 4 are in the embodiment of Fig. 4, after the brightness sensing external light source when light source induction module 102 produces substantial change, detect the brightness of three external light sources at once to produce three external light source brightness values, and brightness value when not yet producing substantial change according to the brightness of three external light source brightness values and external light source, judge the changing condition of external light source, and determine suitable light source input value LS.And in the embodiment of Fig. 7 A and Fig. 7 B, whether controller 104 can be in trigger mode by first detection light source induction module 102, determine that light source induction module 102 is under being in trigger mode, controller 104 just can enter external light source poll pattern.When controller 104 is in external light source poll pattern, light source induction module 102 just starts to detect the brightness of three external light sources to produce three external light source brightness values; Next except when outside carry out step 718 when the changing condition of external light source is fixing, the embodiment of all the other follow-up steps just with Fig. 4 is identical, does not repeat them here.
Fig. 8 A and Fig. 8 B is a kind of process flow diagram adjusting the method for the brightness of backlight disclosed in another embodiment of the present invention.The method mat liquid crystal display systems 100 as shown in Figure 1 of Fig. 8 A and Fig. 8 B illustrates, details are as follows for its step:
Step 800: start;
Step 802: detect current picture signal, to obtain the digital averaging brightness value of picture to display;
Step 804: produce brightness stage of reaction number according to the digital averaging brightness value of picture;
Step 806: detect the brightness of external light source to produce the original luminance value of external light source;
Step 808: after the brightness sensing external light source produces substantial variations, detect whether be in trigger mode, if so, carry out step 810; If not, step 828 is skipped to;
Step 810: send look-at-me;
Step 812: cancel trigger mode;
Step 814: enter external light source poll pattern;
Step 816: when being in external light source poll pattern, starts the brightness of continuous detecting external light source to produce the external light source brightness value of at least three changes;
Step 818: according to the original luminance value of three external light source brightness values and external light source, judge whether the changing condition of external light source is fixing, if so, carry out step 820; If not, step 822 is skipped to;
Step 820: enter trigger mode, skips to step 828;
Step 822: according to the external light source brightness value of three changes and the original luminance value of external light source, determine suitable light source input value LS;
Step 824: according to light source input value LS, and predetermined maximumly present brightness value and minimumly present brightness value, determine the desired value of backlight;
Step 826: according to desired value and the brightness stage of reaction number of backlight, the brightness of adjustment backlight;
Step 828: terminate.
The embodiment of Fig. 8 A and Fig. 8 B and the embodiment difference of Fig. 7 A and Fig. 7 B are in step 822, controller 104 be provide via light source input value LS and human-machine interface module 108 maximumly present brightness value and the minimum setting presenting brightness value substitutes into formula (3), decide the desired value of backlight, all the other steps are identical with the embodiment of Fig. 7 B with Fig. 7 A, do not repeat them here.
Comprehensive the above, prior art has many shortcomings.Such as, the change of the brightness possibility too frequent of liquid crystal panel display, or the brightness of liquid crystal panel display changes suddenly.The method of the brightness of adjustment backlight disclosed in this invention is then that controller 104 first produces brightness stage of reaction number according to the digital averaging brightness value of picture, and after the brightness sensing external light source when light source induction module 102 produces substantial change, by controller 104 poll light source induction module 102, and light source induction module 102 starts to detect repeatedly the brightness of external light source, to judge the changing pattern of external light source, last controller 104, according to the desired value of backlight and brightness stage of reaction number, controls backlight control module 106 to adjust the brightness of backlight.So, the present invention can overcome in the prior art, the change of the brightness possibility too frequent of liquid crystal panel display, or the shortcoming that the brightness of liquid crystal panel display changes suddenly.
The foregoing is only preferred embodiment of the present invention, all equalizations made according to the claims in the present invention change and amendment, all should belong to covering scope of the present invention.
Claims (7)
1. adjust a method for the brightness of backlight, it is characterized in that, comprise:
After the brightness sensing an external light source when a light source induction module changes, detect this light source induction module and whether be in a trigger mode;
If this light source induction module is in a trigger mode, send look-at-me to controller;
This controller notifies that this light source induction module cancels this trigger mode;
This controller enters a poll pattern;
When this controller is in this poll pattern, this light source induction module detects repeatedly the brightness of this external light source to produce multiple external light source brightness value;
Brightness value when not yet changing according to the brightness of the plurality of external light source brightness value and this external light source, judges the changing condition of this external light source;
If this external light source does not change, this controller notifies that this light source induction module enters this trigger mode; And
If this external light source changes, then brightness value when not yet changing according to the brightness of the plurality of external light source brightness value and this external light source, produces a light source input value.
2. the method for claim 1, it is characterized in that, brightness value when not yet changing according to the brightness of the plurality of external light source brightness value and this external light source, the step producing this light source input value comprises: if the brightness value when brightness of this external light source not yet changes and the plurality of external light source brightness value present rising or downtrending, then the external light source brightness value finally recorded in the plurality of external light source brightness value is set to this light source input value.
3. method as claimed in claim 2, it is characterized in that, brightness value when not yet changing according to the brightness of the plurality of external light source brightness value and this external light source, the step producing this light source input value comprises: if the brightness value when brightness of this external light source not yet changes and the plurality of external light source brightness value present irregular alteration trend, then the mean value of the plurality of external light source brightness value is set to this light source input value.
4. the method for claim 1, it is characterized in that, brightness value when not yet changing according to the brightness of the plurality of external light source brightness value and this external light source, the step producing this light source input value comprises: if the brightness value when brightness of this external light source not yet changes and the plurality of external light source brightness value present irregular alteration trend, then the mean value of the plurality of external light source brightness value is set to this light source input value.
5. the method according to any one of Claims 1-4, is characterized in that, also comprises and minimumly presents brightness value according to this light source input value and one, produce the desired value of this backlight.
6. method as claimed in claim 5, is characterized in that, also comprise:
Set the maximum of this backlight and present brightness value; And
Present brightness value according to this backlight maximum, this light source input value and minimumly presents brightness value, produce the desired value of this backlight.
7. the method according to any one of Claims 1-4, is characterized in that, also comprises:
Set the maximum of this backlight and present brightness value; And
Present brightness value according to this backlight maximum, this light source input value and minimumly presents brightness value, produce the desired value of this backlight.
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| CN106373531A (en) * | 2016-10-31 | 2017-02-01 | 广东欧珀移动通信有限公司 | Method for adjusting displaying brightness and electronic equipment |
| CN112017598A (en) * | 2019-05-30 | 2020-12-01 | 北京小米移动软件有限公司 | Backlight brightness adjusting method and device |
| CN111681620B (en) * | 2020-08-11 | 2020-11-20 | 深圳市Tcl高新技术开发有限公司 | Display control method, display device and computer readable storage medium |
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| CN1996458A (en) * | 2006-01-08 | 2007-07-11 | 吴健 | Intelligent dimming system for liquid crystal device |
| CN101404144A (en) * | 2008-11-10 | 2009-04-08 | 友达光电（苏州）有限公司 | Electronic device with automatic brightness adjustment function |
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| CN1602132A (en) * | 2003-09-24 | 2005-03-30 | 皇家飞利浦电子股份有限公司 | System and method of controlling luminous device |
| JP2009086133A (en) * | 2007-09-28 | 2009-04-23 | Sharp Corp | Video display apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1996458A (en) * | 2006-01-08 | 2007-07-11 | 吴健 | Intelligent dimming system for liquid crystal device |
| CN101404144A (en) * | 2008-11-10 | 2009-04-08 | 友达光电（苏州）有限公司 | Electronic device with automatic brightness adjustment function |
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