CN101859546B - Method for adjusting brightness of backlight source - Google Patents
Method for adjusting brightness of backlight source Download PDFInfo
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- CN101859546B CN101859546B CN 201010188896 CN201010188896A CN101859546B CN 101859546 B CN101859546 B CN 101859546B CN 201010188896 CN201010188896 CN 201010188896 CN 201010188896 A CN201010188896 A CN 201010188896A CN 101859546 B CN101859546 B CN 101859546B
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Abstract
The invention discloses a method for adjusting the brightness of a backlight source. The method comprises the following steps of: detecting a current image signal to acquire a digital average brightness value of an image to be displayed and accordingly generate a brightness reaction stage number; entering a polling mode when the brightness of an external light source is truly changed and detecting external light source brightness repeatedly to generate a plurality of external light source brightness values; then, speculating a reasonable external light source brightness value and external light source change conditions according to the external light source brightness values and an original brightness value of the external light source; and adjusting the brightness of the backlight source according to the reasonable external light source brightness value, the external light source change conditions and the brightness reaction stage number.
Description
Technical field
The present invention is relevant for a kind of method of adjusting the brightness of backlight, and the method for the brightness of backlight is adjusted in espespecially a kind of brightness according to environment light source and liquid crystal panel demonstration automatically.
Background technology
Liquid crystal panel is non-luminiferous display device, need just have the function that shows image with backlight.The brightness of liquid crystal panel refers to the bright degree of picture, and reasonably 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 that liquid crystal panel shows is higher, and the color that just easier desalination solution crystal panel shows causes picture partially white.
For instance, the brightness that now a lot of liquid crystal panels show can reach 1000 lumens, 2000 lumens, and higher not the showing of brightness of liquid crystal panel demonstration is better in fact.With regard to actual operating position, 50% of the high-high brightness that the brightness adjustment that liquid crystal panel shows can be exported at backlight is proper.The brightness that liquid crystal panel shows is too high, just might begin to affect the color representation of picture shown on liquid crystal panel.
Therefore, industry member begins to develop and can automatically adjust according to background luminance the technology of back light source brightness.When the brightness of environment had change, liquid crystal panel can automatically be adjusted the brightness of backlight.So the user can not feel that the brightness of liquid crystal panel demonstration is too dark or too bright, but the brightness that feels comfortably cool.In addition, also can by the brightness of automatically adjusting backlight, reach the function of power saving.
Yet prior art has many shortcomings.For example, the brightness that liquid crystal panel shows may change excessively frequently, or the brightness that liquid crystal panel shows changes suddenly.No matter be that the brightness that liquid crystal panel shows changes excessively frequently or changes suddenly, all can cause the user visual uncomfortable.
Summary of the invention
One embodiment of the invention disclose a kind of method of adjusting the brightness of backlight, and the present image signal source of inclusion test one is to obtain the digital averaging brightness value of picture to display; Produce a brightness stage of reaction number according to this digital averaging brightness value; Reach desired value and this brightness stage of reaction number according to a backlight, adjust the brightness of this backlight.
Another embodiment of the present invention discloses a kind of method of adjusting the brightness of backlight, comprises after the brightness that senses an external light source produces substantial variation, detects repeatedly the brightness of this external light source to produce a plurality of external light source brightness values; The brightness value when brightness of external light source brightness values a plurality of according to this and this external light source not yet produces substantial the variation is inferred rational external light source situation of change and light-source brightness value; And according to the external light source brightness value that of infer, decide the desired value of this backlight.
Another embodiment of the present invention discloses a kind of method of adjusting the brightness of backlight, comprises after a light source induction module senses the substantial variation of brightness generation of an external light source, detects this light source induction module and whether is in a trigger mode; If this light source induction module is in a trigger mode, send look-at-me to a controller; This controller notifies this light source induction module to cancel this trigger mode; This controller enters a poll pattern; When this controller was in this poll pattern, this light source induction module detected repeatedly the brightness of this external light source to produce a plurality of external light source brightness values; And the brightness value of the brightness of external light source brightness values a plurality of according to this and this external light source when not yet producing substantial variation, infer rational external light source brightness value and external light source changing condition.
Description of drawings
Fig. 1 is the schematic diagram of explanation liquid crystal display systems;
Fig. 2 is the process flow diagram of the method for disclosed a kind of brightness of adjusting backlight in one embodiment of the invention;
Fig. 3 is the schematic diagram of the relation of the explanation digital averaging brightness value of picture and brightness stage of reaction number;
Fig. 4 is the process flow diagram of the method for disclosed a kind of brightness of adjusting backlight in another embodiment of the present invention;
Fig. 5 is the schematic diagram of the relation of explanation external light source changing pattern and light source input value;
Fig. 6 is the process flow diagram of the method for disclosed a kind of brightness of adjusting backlight in another embodiment of the present invention;
Fig. 7 A and Fig. 7 B are the process flow diagram of the method for disclosed a kind of brightness of adjusting backlight in another embodiment of the present invention;
Fig. 8 A and Fig. 8 B are the process flow diagram of the method for disclosed a kind of brightness of adjusting backlight 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 that shows 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 of explanation liquid crystal display systems 100.Liquid crystal display systems 100 comprises a light source induction module 102, a controller 104, a backlight control module 106 and a human-machine interface module 108.Light source induction module 102 is coupled to controller 104, in order to the brightness of sensing external light source and 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 present image signal source, to obtain the digital averaging brightness value of picture to display; Produce brightness stage of reaction number according to the digital averaging brightness value of picture; The maximum that provides according to suitable light source input value and human-machine interface module 108 presents brightness value and the minimum setting that presents brightness value, to determine the desired value of backlight; Control backlight control module 106 to adjust the brightness of backlight.Backlight control module 106 in order to the control signal that receives controller 104 to adjust the brightness of backlight.The maximum that human-machine interface module 108 is set backlight via the user presents brightness value and minimum presents brightness value.
Please refer to Fig. 2 and Fig. 3.Fig. 2 is the process flow diagram of the method for disclosed a kind of brightness of adjusting backlight in one embodiment of the invention, and Fig. 3 is the schematic diagram of the relation of the digital averaging brightness value of explanation picture and brightness stage of reaction number.The method of Fig. 2 is by liquid crystal display systems shown in Figure 1 100 explanations, and details are as follows for its step:
Step 200: beginning;
Step 202: detect present 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 and minimum presents brightness value according to the maximum of setting, determine the desired value of backlight;
Step 208: according to desired value and the brightness stage of reaction number of backlight, adjust the brightness of backlight;
Step 210: finish.
In the embodiment of Fig. 2, step 202, controller 104 detects present 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, the maximum that the user sets backlight by human-machine interface module 108 presents brightness value and minimum presents brightness value, for example the user's minimum that can set backlight presents brightness value and maximum presents brightness value, wherein the minimum brightness value that presents is the high-high brightness that can present with respect to backlight with the maximum expression mode that presents brightness value, the high-high brightness that for example can present with backlight is used as 100%, it is 40% (cold-cathode tube backlight) or 20% (back light source in LED) that minimum presents brightness value, but the present invention is not limited to this, the maximum brightness value that presents is according to user's visual custom, usually between 50%-100%.
After the minimum that determines backlight presented brightness value and maximum and presents brightness value, controller 104 can be determined by formula (1) the desired value BLT of backlight.
BLT＝min+60％*ES (1)
Wherein ES presents brightness value for the maximum that the user sets backlight, and min is that the minimum of backlight presents brightness value (for example: the cold-cathode tube backlight is 40%, and back light source in LED is 20%).For instance, it is 70% that the maximum that the user sets the cold-cathode tube backlight presents brightness value ES, the desired value BLT=40%+60%*70%=82% of backlight.
In step 208, the desired value of the backlight that controller 104 obtains according to formula (1) and the brightness stage of reaction number that obtains in step 204 are controlled backlight control module 106 to adjust the brightness of backlight.In addition, controller 104 is controlled backlight control module 106 with the pattern of the brightness of adjustment backlight, is the brightness of adjusting each luminescence unit in 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 to say, when the digital averaging brightness value of picture is brighter, the brightness of adjusting backlight needs more reaction time (brightness stage of reaction number is more), with the rapid variation of the brightness of avoiding backlight, causes the visual discomfort of user.
Fig. 4 is the process flow diagram of the method for disclosed a kind of brightness of adjusting backlight in another embodiment of the present invention.The method of Fig. 4 is by liquid crystal display systems shown in Figure 1 100 explanations, and details are as follows for its step:
Step 400: beginning;
Step 402: detect present 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 brightness value of external light source;
Step 408: after the brightness that senses external light source produced substantial variations, the brightness of continuous detecting external light source was to produce the external light source brightness value of at least three variations;
Step 410: according to the original brightness value of external light source brightness value and the external light source of three variations, the changing condition of judgement external light source, and determine suitable light source input value LS;
Step 412: according to light source input value LS, determine the desired value of backlight;
Step 414: according to desired value and the brightness stage of reaction number of backlight, adjust the brightness of backlight;
Step 416: finish.
In the embodiment of Fig. 4, step 402, step 404 and step 202, step 204 are identical, do not repeat them here.In step 406, light source induction module 102 detects the brightness of external light source to obtain the original brightness value of external light source.In step 408, after brightness that light source induction module 102 senses external light source produced the variation of essence, the brightness of continuous detecting external light source was to produce external light source brightness value L ux1, Lux2 and the Lux3 of at least three variations.In step 410, light source induction module 102 utilizes external light source brightness value L ux1, the Lux2 of three variations and the original brightness value LS0 of Lux3 and external light source (for example last light source input value), then judge the changing condition of external light source according to the external light source changing pattern of Fig. 5, to determine suitable light source input value LS.For example, external light source brightness value L ux1, Lux2 and the Lux3 of the original brightness value LS0 of external light source and three variations present ascendant trend, that is to say LS0＜Lux1＜Lux2＜Lux3, light source input value LS are made as Lux3.In addition, if external light source brightness value L ux1, Lux2 and the Lux3 of the original brightness value LS0 of external light source and three variations present downtrending, that is to say LS0＞Lux1＞Lux2＞Lux3, light source input value LS is made as Lux3.If external light source brightness value L ux1, Lux2 and the Lux3 of the original brightness value LS0 of external light source and three variations present irregular alteration trend, light source input value LS is made as (Lux1+Lux2+Lux3)/3.
In step 412, after determining suitable light source input value LS, controller 104 can be determined by formula (2) the desired value BLT of backlight.
BLT＝min+60％*LS (2)
Wherein min is that the minimum of backlight presents brightness value (for example: the cold-cathode tube backlight is 40%, and back light source in LED is 20%).For instance, when suitable light source input value LS be 70% and backlight when being cold-cathode tube, 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 that obtains in step 404 are controlled backlight control module 106 to adjust the brightness of backlight.In addition, controller 104 is controlled backlight control module 106 with the pattern of the brightness of adjustment backlight, and is identical with the embodiment of Fig. 2, do not repeat them here.
Fig. 6 is the process flow diagram of the method for disclosed a kind of brightness of adjusting backlight in another embodiment of the present invention.The method of Fig. 6 is by liquid crystal display systems shown in Figure 1 100 explanations, and details are as follows for its step:
Step 600: beginning;
Step 602: detect present 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 brightness value of external light source;
Step 608: after the brightness that senses external light source produced substantial variations, the brightness of continuous detecting external light source was to produce the external light source brightness value of at least three variations;
Step 610: according to the original brightness value of three external light source brightness values and external light source, the changing condition of judgement external light source, and determine suitable light source input value LS;
Step 612: provide predetermined maximum to present brightness value and minimum presents brightness value;
Step 614: according to light source input value LS and predetermined maximum presents brightness value and minimum presents brightness value, determine the desired value of backlight;
Step 616: according to desired value and the brightness stage of reaction number of backlight, adjust the brightness of backlight;
Step 618: finish.
The embodiment difference of the embodiment of Fig. 6 and Fig. 4 is in step 610, controller 104 is to present brightness value and the minimum setting substitution formula (3) that presents brightness value via the maximum that light source input value LS and human-machine interface module 108 provide, decide the desired value of backlight, the embodiment of all the other steps and Fig. 4 is identical, does not repeat them here.
BLT＝min+60％*ES*LS (3)
Wherein ES presents brightness value (maximum that human-machine interface module 108 provides presents brightness value) for the maximum that the user sets backlight, min is that the minimum of backlight presents brightness value (for example: the cold-cathode tube backlight is 40%, and back light source in LED is 20%).For instance, it is 70% that the maximum that the user sets the cold-cathode tube backlight presents brightness value ES, if when suitable light source input value LS is 80%, and the desired value BLT=40%+60%*70%*80%=73.6% of backlight.
Fig. 7 A and Fig. 7 B are the process flow diagram of the method for disclosed a kind of brightness of adjusting backlight in another embodiment of the present invention.The method of Fig. 7 A and Fig. 7 B is by liquid crystal display systems shown in Figure 1 100 explanations, and details are as follows for its step:
Step 700: beginning;
Step 702: detect present 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 brightness value of external light source;
Step 708: after the brightness that senses external light source produces substantial variations, detect whether be in trigger mode, if so, carry out step 710; If not, skip to step 728;
Step 710: send look-at-me;
Step 712: cancel trigger mode;
Step 714: enter the external light source poll pattern;
Step 716: when being in the external light source poll pattern, the brightness of beginning continuous detecting external light source is to produce the external light source brightness value of at least three variations;
Step 718: the original brightness value according to external light source brightness value and the external light source of three variations, judge whether the changing condition of external light source is fixing, if so, carry out step 720; If not, skip to step 722;
Step 720: enter trigger mode, skip to step 728;
Step 722: the original brightness value according to external light source brightness value and the external light source of three variations determines suitable light source input value LS;
Step 724: according to light source input value LS, determine the desired value of backlight;
Step 726: according to desired value and the brightness stage of reaction number of backlight, adjust the brightness of backlight;
Step 728: finish.
The embodiment difference of the embodiment of Fig. 7 A and Fig. 7 B and Fig. 4 is in the embodiment of Fig. 4, sense the substantial variation of brightness generation of external light source when light source induction module 102 after, detect at once the brightness of three external light sources to produce three external light source brightness values, and the brightness value when not yet producing substantial the variation according to the brightness of three external light source brightness values and external light source, the changing condition of judgement 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, determines that light source induction module 102 is to be under trigger mode, and controller 104 just can enter the external light source poll pattern.When controller 104 was in the external light source poll pattern, light source induction module 102 just began to detect the brightness of three external light sources to produce three external light source brightness values; Next except when outside the changing condition of external light source carry out step 718 for fixedly the time, all the other follow-up steps just followed the embodiment of Fig. 4 identical, do not repeat them here.
Fig. 8 A and Fig. 8 B are the process flow diagram of the method for disclosed a kind of brightness of adjusting backlight in another embodiment of the present invention.The method of Fig. 8 A and Fig. 8 B is by liquid crystal display systems shown in Figure 1 100 explanations, and details are as follows for its step:
Step 800: beginning;
Step 802: detect present 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 brightness value of external light source;
Step 808: after the brightness that senses external light source produces substantial variations, detect whether be in trigger mode, if so, carry out step 810; If not, skip to step 828;
Step 810: send look-at-me;
Step 812: cancel trigger mode;
Step 814: enter the external light source poll pattern;
Step 816: when being in the external light source poll pattern, the brightness of beginning continuous detecting external light source is to produce the external light source brightness value of at least three variations;
Step 818: according to the original brightness 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, skip to step 822;
Step 820: enter trigger mode, skip to step 828;
Step 822: the original brightness value according to external light source brightness value and the external light source of three variations determines suitable light source input value LS;
Step 824: according to light source input value LS, and predetermined maximum presents brightness value with minimum presents brightness value, the desired value of decision backlight;
Step 826: according to desired value and the brightness stage of reaction number of backlight, adjust the brightness of backlight;
Step 828: finish.
The embodiment difference of the embodiment of Fig. 8 A and Fig. 8 B and Fig. 7 A and Fig. 7 B is in step 822, controller 104 is to present brightness value and the minimum setting substitution formula (3) that presents brightness value via the maximum that light source input value LS and human-machine interface module 108 provide, 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.For example, the brightness that liquid crystal panel shows may change excessively frequently, or the brightness that liquid crystal panel shows changes suddenly.The method of the brightness of adjustment backlight disclosed in this invention is that controller 104 first produces brightness stage of reaction number according to the digital averaging brightness value of picture, and sense the substantial variation of brightness generation of external light source when light source induction module 102 after, by controller 104 poll light source induction modules 102, and light source induction module 102 begins to detect repeatedly the brightness of external light source, changing pattern with the judgement external light source, last controller 104 is controlled backlight control module 106 to adjust the brightness of backlight according to desired value and the brightness stage of reaction number of backlight.So, the present invention can overcome in the prior art, and the brightness that liquid crystal panel shows may change excessively frequently, or the shortcoming that changes suddenly of the brightness that shows of liquid crystal panel.
The above is only preferred embodiment of the present invention, and all equalizations of making according to claim of the present invention change and revise, and all should belong to covering scope of the present invention.
Claims (10)
1. a method of adjusting the brightness of backlight, is characterized in that, comprises:
Detect a present picture signal, to obtain the digital averaging brightness value of picture to display;
Produce a brightness stage of reaction number according to this digital averaging brightness value; Sense the brightness generation substantial variations of an external light source when a light source induction module after, 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 a controller;
This controller notifies this light source induction module to cancel this trigger mode;
This controller enters a poll pattern;
When this controller was in this poll pattern, the brightness of this this external light source of light source induction module continuous detecting was to produce a plurality of external light source brightness values; And
The original brightness value of external light source brightness values a plurality of according to this and this external light source judges the changing condition of this external light source;
When this situation of change was on-fixed, the original brightness value of external light source brightness values a plurality of according to this and this external light source determined a light source input value;
According to this light source input value, determine the desired value of backlight;
According to desired value and this brightness stage of reaction number of this backlight, adjust the brightness of this backlight.
2. the method for claim 1, is characterized in that, the brightness of adjusting this backlight comprises the brightness of each luminescence unit of adjusting this backlight.
3. the method for claim 1, is characterized in that, the brightness of adjusting this backlight comprises the part luminescence unit of closing and/or open this backlight.
4. the method for claim 1, is characterized in that, also comprises the maximum of setting this backlight and present brightness value.
5. method as claimed in claim 4, is characterized in that, comprises also that maximum according to this backlight presents brightness value and a minimum presents brightness value, produces the desired value of this backlight.
6. the method for claim 1, is characterized in that, also comprises:
If the changing condition of this external light source is for fixedly the time, this controller notifies this light source induction module to enter this trigger mode.
7. the method for claim 1, it is characterized in that, this original brightness value of these a plurality of external light source brightness values of this basis and this external light source, the step that produces a light source input value comprises, if the brightness value the when brightness of this external light source not yet produces substantial change and this a plurality of external light source brightness values present rising or downtrending, the external light source brightness value that records at last in will these a plurality of external light source brightness values is made as this light source input value.
8. the method for claim 1, it is characterized in that, the original brightness value of these a plurality of external light source brightness values of this basis and this external light source, the step that produces a light source input value comprises, if brightness value and these a plurality of external light source brightness values when the brightness of this external light source not yet produces substantial change present irregular alteration trend, mean value that will these a plurality of external light source brightness values is made as this light source input value.
9. the method for claim 1, is characterized in that, also comprises according to this light source input value and a minimum and present brightness value, produces the desired value of this backlight.
10. the method for claim 1, is characterized in that, also comprises:
The maximum of setting this backlight presents brightness value; And
Present brightness value, this light source input value and a minimum according to the maximum of this backlight and present brightness value, produce the desired value of this backlight.
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| CN102402942B (en) * | 2011-11-02 | 2014-05-28 | 深圳创维－Rgb电子有限公司 | Method for improving energy efficiency index of LED (light-emitting diode) display screen and LED display screen |
| CN103050097B (en) * | 2013-01-21 | 2015-02-04 | 小米科技有限责任公司 | Method and device for regulating brightness of backlight lamp |
| CN104795054B (en) * | 2015-05-13 | 2018-02-13 | 上海斐讯数据通信技术有限公司 | A kind of automatic brightness adjustment method and system |
| CN105869603A (en) * | 2015-09-22 | 2016-08-17 | 乐视致新电子科技（天津）有限公司 | Screen brightness regulation method and device |
| CN107799093A (en) * | 2017-12-08 | 2018-03-13 | 深圳市金立通信设备有限公司 | Adjust method, terminal and the computer-readable recording medium of screen luminance of terminal |
| CN110223659B (en) * | 2019-07-18 | 2021-07-06 | 福建晶彩光电科技股份有限公司 | Method for controlling the brightness of a display screen comprising an active matrix of pixels |
| CN113192464B (en) * | 2020-01-14 | 2023-01-13 | 华为技术有限公司 | Backlight adjusting method and electronic equipment |
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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 |
| CN1996458A (en) * | 2006-01-08 | 2007-07-11 | 吴健 | Intelligent dimming system for liquid crystal device |
| JP2009086133A (en) * | 2007-09-28 | 2009-04-23 | Sharp Corp | Video display apparatus |
| CN201122422Y (en) * | 2007-12-05 | 2008-09-24 | 群康科技(深圳)有限公司 | LCD device |
| CN101404144B (en) * | 2008-11-10 | 2010-10-06 | 友达光电（苏州）有限公司 | Electronic device with automatic brightness adjustment function |
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