CN101814272B - Display device and brightness adjusting method thereof - Google Patents
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- CN101814272B CN101814272B CN2009100091531A CN200910009153A CN101814272B CN 101814272 B CN101814272 B CN 101814272B CN 2009100091531 A CN2009100091531 A CN 2009100091531A CN 200910009153 A CN200910009153 A CN 200910009153A CN 101814272 B CN101814272 B CN 101814272B
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Abstract
The invention relates to a display device and a brightness adjusting method thereof. The display device is used for receiving and displaying an image signal and comprises a display screen, a light detection assembly, a light information processing unit, an image analyzing unit, a brightness decision unit and a control unit. The light detection assembly is used for detecting the ambient brightness; the light information processing unit is used for calculating a first brightness adjusting value according to the ambient brightness; the image analyzing unit is used for analyzing the image signal; the brightness decision unit is used for calculating a second brightness adjusting value as well as a final brightness adjusting value according to the first brightness adjusting value and the second brightness adjusting value; and the control unit is used for adjusting the brightness of the display screen according to the final brightness adjusting value. The display device can judge whether the light of the environment is sufficient or not and correspondingly adjust the brightness of the display screen according to the brightness of the displayed image; and with different display modes, the energy consumption of the display device can be reduced or better image display effect can be achieved for a user to watch.
Description
Technical field
The present invention relates to a kind of display device and luminance regulating method thereof, particularly relate to a kind of can be in response to the difference of ambient brightness and image brilliance that display device receives, with the display device and the luminance regulating method thereof of automatic adjustment display screen intrinsic brightness.
Background technology
The function that display device provides image to show is watched for the user, and general display device can be used for connecting main frame to show the associative operation picture, also can connect antenna or signal wire to receive TV or other signal of video signal.According to the individual custom of watching and the difference of display device institute putting position, the user can be voluntarily adjusts the parameter such as brightness, contrast of display device by the respective operations interface of display device (for example function button or install built-in software), to meet all types of demands.
With the LCD screen is example, in existing known technology, has existed the related display apparatus design that can adjust display screen brightness according to the difference of measured external environment brightness, but often must accept or reject between the two at visual effect and energy loss.In design when focusing on visual effect, relatively can the more energy of loss; Otherwise focus on less energy intensive with in response to environmental requirement the time in design, relatively visual effect is just had a greatly reduced quality.For instance, when utilizing display device to play dynamic film, at the design of environmental protection and energy saving emphatically, no matter exhibit high brilliance image or low-light level image under the state of low environment brightness, all can reduce its image brilliance, to make so that the low-light level image is more obscure and be difficult to identification, and cause visual effect not good.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of can receive the gradation degree to adjust the display device of display screen brightness in response to environment and display device.
For reaching above-mentioned purpose, display device of the present invention is in order to receive and the show image signal, and display device comprises display screen, photodetection assembly, light information processing unit, image analysing computer unit, brightness decision unit and control module.Photodetection assembly is in order to testing environment brightness; Light information processing unit calculates the first brightness adjusted value in order to the foundation ambient brightness; The image analysing computer unit is in order to analyze signal of video signal to obtain an image color range value; Brightness decision unit calculates the second brightness adjusted value according to image color range value, and goes out final brightness adjusted value according to the first brightness adjusted value and the second brightness adjustment calculation; Control module is in order to adjust the brightness of display screen according to final brightness adjusted value.Design by this, display device of the present invention can judge not only whether the light of environment of living in is sufficient, and can come the corresponding brightness of adjusting display screen according to shown image bright-dark degree; By different display modes, also can reduce the power consumption of display device or reach preferable image display effect and watch for the user.
Display device luminance regulating method of the present invention may further comprise the steps: testing environment brightness is to calculate the first brightness adjusted value; Analyze signal of video signal obtaining image color range value, and calculate the second brightness adjusted value according to image color range value; The foundation first brightness adjusted value and the second brightness adjusted value are to determine a final brightness adjusted value; Adjust the brightness of display screen according to final brightness adjusted value.
Description of drawings
Fig. 1 is the circuit block diagram of display device of the present invention.
Fig. 2 is the process flow diagram of display device luminance regulating method of the present invention.
The primary clustering symbol description:
Display device 1 image analysing computer unit 40
Display screen 10 brightness decision unit 50
Liquid crystal panel 12 control modules 60
Backlight module 14 back lights 70
Photodetection assembly 20 panel driving unit 80
Light information processing unit 30
Embodiment
For allowing the auditor can more understand technology contents of the present invention, be described as follows especially exemplified by going out preferred embodiment.
Below please refer to Fig. 1, be the circuit block diagram of display device 1 of the present invention.Display device 1 of the present invention can receive and the show image signal, and as shown in Figure 1, display device 1 of the present invention comprises display screen 10, photodetection assembly 20, light information processing unit 30, image analysing computer unit 40, brightness decision unit 50 and control module 60.Display screen 10 comprises liquid crystal panel 12 and backlight module 14.Photodetection assembly 20 can be an illuminometer or other optical sensing subassemblies, and it is adjacent to display screen 10 and is provided with, in order to detect the ambient brightness of irradiate light on display screen 10 of external environment.Light information processing unit 30 is electrically connected at photodetection assembly 20, also carries out correlation computations according to it in order to receive photodetection assembly 20 measured ambient brightnesss, to draw the first brightness adjusted value.Image analysing computer unit 40 is in order to the color range distribution of the signal of video signal analyzing display device 1 and received, obtaining an image color range value, brightness decision unit 50 and according to this image color range value to calculate the second brightness adjusted value.
Brightness decision unit 50 is electrically connected at light information processing unit 30 and image analysing computer unit 40, so that receive aforementioned calculate, calculate to draw final brightness adjusted value through integrating again corresponding to first brightness adjusted value of ambient brightness and the second brightness adjusted value of the image brilliance that calculates.Control module 60 is electrically connected at brightness decision unit 50, back light 70 and screen driver element 80, receive the information of final brightness adjusted value when control module 60 after, can decide the luminous intensity of backlight module 14 according to the electric weight that final brightness adjusted value control back light 70 is supplied with backlight module 14, and control panel driver element 80 driving liquid crystal panels 12, so that adjust the brightness of display screen 10.
At first first is just discussed corresponding to the calculating of the first brightness adjusted value of ambient brightness earlier.Display device 1 of the present invention can calculate the first brightness adjusted value by following arithmetic expression:
L
1＝(B
max-B
min)*(Le-Le
min)/(Le
max-Le
min)+B
min(1)
L wherein
1Be the first brightness adjusted value, Le is the measured ambient brightness of photodetection assembly 20, Le
MaxBe photodetection assembly 20 detectable maximum ambient brightnesss, Le
MinBe photodetection assembly 20 detectable minimum ambient brightnesss, B
MaxBe the adjustable high-high brightness limit value of corresponding ambient brightness, B
MinBe the adjustable minimum brightness limit value of corresponding ambient brightness.High-high brightness limit value B wherein
MaxAnd minimum brightness limit value B
MinCan change according to the different set of display device 1.And photodetection assembly 20 detectable ambient brightnesss can form a quantization scale value by light information processing unit 30, when display device 1 under the state that does not have extraneous light fully, photodetection assembly 20 measured ambient brightnesss are minimum ambient brightness Le
MinBe subjected to when display device 1 under the irradiation of daylight or intense light, photodetection assembly 20 measured ambient brightnesss are maximum ambient brightness Le
MaxBy this to judge the quantification benchmark of measured ambient brightness as photodetection assembly 20.
For instance, suppose that it is 40～80 (general display device is 0～100 for the value range of brightness adjustment) that present display device 1 sets the adjustable brightness range of corresponding ambient brightness, that is set high-high brightness limit value B
MaxBe 80, minimum brightness limit value B
MinBe 40.Suppose maximum ambient brightness Le again
MaxBe 20, minimum ambient brightness Le
MinBe 0.Apply mechanically aforementioned setting value, when photodetection assembly 20 measured ambient brightness Le are 20, the aforementioned formula of numerical value substitution (1) can be calculated the first brightness adjusted value L
1Be 80, that is under the state of the highest ambient brightness, display device 1 can be adjusted display screen 10 brightness to high-high brightness limit value B thereupon
MaxOtherwise, when photodetection assembly 20 measured ambient brightness Le are 0, the aforementioned formula of numerical value substitution (1) can be calculated the first brightness adjusted value L
1Be 40, that is under the state of minimum ambient brightness, display device 1 can be adjusted display screen 10 brightness to minimum brightness limit value B thereupon
MinTherefore, display device 1 of the present invention can be tried to achieve the first corresponding brightness adjusted value L in response to varying environment brightness
1, to adjust display screen 10 brightness.
Then second portion is just discussed corresponding to the calculating of the second brightness adjusted value of image brilliance.Display device 1 of the present invention can be set an image color range reference value, and in order to be high brightness image or low-light level image as the benchmark of judging image brilliance with rough differentiation signal of video signal, this image color range reference value is between 0 to 255.Brightness decision unit 50 receives the obtained image color range value in image analysing computer unit 40, and by comparing with image color range reference value, tries to achieve the second brightness adjusted value to apply mechanically different arithmetic expressions.Wherein when obtained image color range value during more than or equal to image color range reference value, display device 1 of the present invention can calculate the second brightness adjusted value by following arithmetic expression:
L
2＝B*(Lv-Lv
min)/Lv
max(2)
L wherein
2Be the second brightness adjusted value, Lv is an image color range value, Lv
MaxBe obtainable largest image color range value, Lv
MinBe obtainable minimum image color range value, B is the brightness-adjusting value range of corresponding image analysing computer unit 40.This moment obtainable minimum image color range value Lv
MinBe image color range reference value.
For instance, suppose that the image color range reference value that present display device 1 sets is 100, the brightness-adjusting value range B of corresponding image analysing computer unit 40 is 20 (scope is 0～20), and obtainable largest image color range value Lv
MaxBe 255, obtainable minimum image color range value Lv
MinBe 100.Apply mechanically aforementioned setting value, when the signal of video signal that is received when display device 1 was maximum brightness, image analysing computer unit 40 obtained image color range value Lv were 255, and brightness decision unit 50 can calculate the second brightness adjusted value L with the aforementioned formula of this numerical value substitution (2)
2Be about 12, that is under the state of the highest image brilliance, the display screen 10 brightness maximal values that display device 1 can be adjusted according to this are 12; Otherwise image analysing computer unit 40 obtained image color range value Lv are 100 o'clock, and brightness decision unit 50 can calculate the second brightness adjusted value L with the aforementioned formula of numerical value substitution (2)
2Be 0, that is under the state of general image brilliance, display device 1 is disobeyed image brilliance, and 10 brightness adjust to display screen.Therefore, when the image color range value Lv of the signal of video signal that receives when image color range reference value is above, display device 1 of the present invention can improve the second corresponding brightness adjusted value L along with the increase of image color range value Lv
2, that is can carry out many more brightness adjustment at bright more image.
On the other hand, when brightness decision unit 50 was analyzed the obtained image color range value Lv of signal of video signal less than image color range reference value, display device 1 of the present invention can calculate the second brightness adjusted value by following arithmetic expression:
L
2＝B*[1-(Lv-Lv
min)/Lv
max](3)
L wherein
2Be the second brightness adjusted value, Lv is an image color range value, Lv
MaxBe obtainable largest image color range value, Lv
MinBe obtainable minimum image color range value, B is the brightness-adjusting value range of corresponding image analysing computer unit 40.This moment obtainable largest image color range value Lv
MaxBe image color range reference value.
For instance, suppose that the image color range reference value that present display device 1 sets is 100, the brightness-adjusting value range B of corresponding image analysing computer unit 40 is 20 (0～20), obtainable largest image color range value Lv
MaxBe 100, and obtainable minimum image color range value Lv
MinBe 0.Apply mechanically aforementioned setting value, when the signal of video signal that is received when display device 1 was minimum brightness, image analysing computer unit 40 obtained image color range value Lv were 0, and brightness decision unit 50 can calculate the second brightness adjusted value L with the aforementioned formula of this numerical value substitution (3)
2Be about 20, that is under the state of minimum image brilliance, the display screen 10 brightness maximal values that display device 1 can be adjusted according to this are 20; Otherwise image analysing computer unit 40 obtained image color range value Lv are 100 o'clock, and brightness decision unit 50 can calculate the second brightness adjusted value L with the aforementioned formula of this numerical value substitution (3)
2Be 0, this moment is identical with the calculating of aforementioned formula (2), and under the state of general image brilliance, display device 1 is disobeyed image brilliance, and 10 brightness adjust to display screen.Therefore, when the image color range value Lv of the signal of video signal that receives when image color range reference value is following, display device 1 of the present invention reduces the second corresponding brightness adjusted value L along with the increase of image color range value Lv
2, that is can carry out many more brightness adjustment at dark more image.
When brightness decision unit 50 obtains the first brightness adjusted value L corresponding to ambient brightness
1Reach the second brightness adjusted value L corresponding to image brilliance
2Afterwards, just can integrate calculating to draw final brightness adjusted value.Display device 1 of the present invention can calculate final brightness adjusted value by following arithmetic expression:
L＝L
1±L
2+S(4)
Wherein L is final brightness adjusted value, L
1Be the first brightness adjusted value, L
2Be the second brightness adjusted value, S is an offset.Between its Chinese style (4) is every for addition or to subtract each other be to be judged according to the different operation modes of display device 1 by brightness decision unit 50.Offset S is a setting value, can determine its numerical values recited and positive and negative in response to different conditions.
Display device 1 of the present invention can start an energy saver mode or according to the functional requirement difference and view and admire pattern.Under energy saver mode, consider the power consumption that will reduce display device 1, must reduce the brightness of display screen 10, so brightness decision unit 50 is selected with the first brightness adjusted value L when utilizing formula (4) to carry out the calculating of final brightness adjusted value
1With the second brightness adjusted value L
2Subtract each other, to downgrade final brightness adjusted value L.Energy saver mode is mainly used in the signal of video signal that is received when being static image, for example use word processor such as word to carry out the literal input, because the background luminance of this type of signal of video signal is higher, as long as see the word segment in the signal of video signal for the user clearly, need not to use too high brightness, therefore by energy saver mode with the first brightness adjusted value L that obtains according to ambient brightness in the formula (4)
1Deduct according to analyzing the second brightness adjusted value L that this signal of video signal is obtained
2, reduce the brightness of display screen 10, reduce the power consumption of display device 1.
Display device 1 of the present invention in addition is under the pattern of viewing and admiring, and brightness decision unit 50 can decide the first brightness adjusted value L according to analyzing the obtained image color range value of signal of video signal when utilizing formula (4) to carry out the calculating of final brightness adjusted value
1With the second brightness adjusted value L
2Addition or subtract each other is to heighten or to turn down final brightness adjusted value L.The pattern of viewing and admiring is mainly used in the signal of video signal that is received when being dynamic image, movie or show game picture etc. for example, because this type of signal of video signal can change its image brilliance at any time, therefore by the pattern of viewing and admiring, when the brightness of signal of video signal is higher, with the first brightness adjusted value L that obtains according to ambient brightness in the formula (4)
1With the second brightness adjusted value L that obtains according to this signal of video signal of analysis
2Subtract each other, reduce the brightness of display screen 10; Otherwise when the brightness of signal of video signal is low, with the first brightness adjusted value L in the formula (4)
1With the second brightness adjusted value L that obtains according to this signal of video signal of analysis
2Addition, the brightness that improves display screen 10 makes darker image can see clearlyer, to reach preferable appreciation effect.
Design by this, display device 1 of the present invention is by the brightness of external environment brightness and the signal of video signal that the receives benchmark as the brightness of adjustment display screen, and, can reach the power consumption of reduction display device 1 or preferable image display effect and watch for the user according to the different mode that display device 1 is started.
Please refer to Fig. 2, be the process flow diagram of display device luminance regulating method of the present invention.It is noted that, though below be that example illustrates display device luminance regulating method of the present invention with display device shown in Figure 11, but the present invention is not to be applicable to that display device 1 exceeds the also applicable detection method of the present invention of the display device of the similar framework of any other tool.As shown in Figure 2, display device luminance regulating method of the present invention comprises that step 200 is to step 230.Below will describe each step of display device luminance regulating method of the present invention in detail.
At first carry out step 200: detect an ambient brightness to calculate one first brightness adjusted value.As shown in Figure 1, display device luminance regulating method of the present invention is applied to aforesaid display device 1, display device 1 comprises photodetection assembly 20 and light information processing unit 30, in order to measure the ambient brightness of display device 1 position, photodetection assembly 20 is adjacent to display screen 10 to be provided with, make photodetection assembly 20 can receive external environment and shine light intensity on display screen 10, to record ambient brightness.Measured ambient brightness can calculate by light information processing unit 30, in the aforementioned formula of substitution (1) to obtain the first brightness adjusted value.
Step 210: analyze signal of video signal to obtain an image color range value.As shown in Figure 1, display device 1 also comprises image analysing computer unit 40, and image analysing computer unit 40 can be analyzed at the signal of video signal that display device 1 is received, to obtain the image color range value of this signal of video signal.Measured image color range value can be calculated by image analysing computer unit 40.
Brightness decision unit 50 is obtained the second brightness adjusted value according to this image color range value, and wherein the decision of this second brightness adjusted value also can compare according to the image color range reference value that display device 1 sets, and decides in aforementioned formula of substitution (2) or the formula (3).
Step 220: the foundation first brightness adjusted value and the second brightness adjusted value are to determine a final brightness adjusted value.As shown in Figure 1, display device 1 also comprises brightness decision unit 50, and brightness decision unit 50 can be integrated calculating according to the first brightness adjusted value and the second brightness adjusted value, in the aforementioned formula of substitution (4) to obtain final brightness adjusted value.The pattern difference that is started according to display device 1 (energy saver mode or view and admire pattern) wherein, make brightness decision unit 50 or to subtract each other, to calculate corresponding final brightness adjusted value in response to different situations with the first brightness adjusted value and the second brightness adjusted value addition.
Step 230: adjust the brightness of display screen according to final brightness adjusted value.Display device 1 also comprises control module 60, after trying to achieve final brightness adjusted value by abovementioned steps 220, control module 60 can send the electric weight that signal controlling back light 70 is supplied with backlight module 14 according to this final brightness adjusted value, and control panel driver element 80 drives liquid crystal panel 12, to adjust the brightness of display screens 10 in response to different situations.
To sum up institute is old, and no matter the present invention everywhere all shows it totally different in the feature of known technology with regard to purpose, means and effect, is a quantum jump, earnestly asks the auditor to perceive, and grants quasi patent early, makes Jiahui society, and the true feeling moral just.Only must notice that the foregoing description only is illustrative principle of the present invention and effect thereof, but not is used to limit the scope of the invention.Any those skilled in the art all can be under know-why of the present invention and spirit, and embodiment is made an amendment and changes.The scope of the present invention should be as described claims scope described.
Claims (14)
1. display device, in order to receive and to show a signal of video signal, described display device comprises:
One display screen;
One photodetection assembly is arranged at contiguous described display screen place, in order to detect an ambient brightness;
One light information processing unit is in order to calculate one first brightness adjusted value according to described ambient brightness;
An image color range value is obtained in order to analyze described signal of video signal in one image analysing computer unit;
One brightness decision unit calculates one second brightness adjusted value according to described image color range value, and goes out a final brightness adjusted value according to described first brightness adjusted value and the described second brightness adjustment calculation; And
One control module is in order to adjust the brightness of described display screen according to described final brightness adjusted value;
Wherein said final brightness adjusted value can be resultant by following formula:
L＝L
1±L
2+S，
Wherein L is described final brightness adjusted value, L
1Be the described first brightness adjusted value, L
2Be the described second brightness adjusted value, S is an offset.
2. display device as claimed in claim 1, wherein when described display device started an energy saver mode, described brightness decision unit was by subtracting each other described first brightness adjusted value and the described second brightness adjusted value, to downgrade described final brightness adjusted value.
3. display device as claimed in claim 1, wherein when pattern is viewed and admired in described display device startup one, described brightness decision unit can be according to the decision of described image color range value with described first brightness adjusted value and the described second brightness adjusted value addition or subtract each other, to adjust described final brightness adjusted value.
4. display device as claimed in claim 1, the wherein said first brightness adjusted value can be resultant by following formula:
L
1＝(B
max-B
min)*(Le-Le
min)/(Le
max-Le
min)+B
min，
L wherein
1Be the described first brightness adjusted value, Le is described ambient brightness, Le
MaxBe detectable one maximum ambient brightness, Le
MinBe detectable one minimum ambient brightness, B
MaxBe an adjustable high-high brightness limit value, B
MinBe an adjustable minimum brightness limit value.
5. display device as claimed in claim 1, wherein said display device can be set an image color range reference value, and described image color range reference value is between 0 to 255.
6. display device as claimed in claim 5, wherein when described image color range value during more than or equal to described image color range reference value, described image color range reference value is obtainable minimum image color range value, and the described second brightness adjusted value can be resultant by following formula:
L
2＝B*(Lv-Lv
min)/Lv
max，
L wherein
2Be the described second brightness adjusted value, Lv is described image color range value, Lv
MaxBe an obtainable largest image color range value, Lv
MinBe obtainable one minimum image color range value, B is the brightness-adjusting value range of corresponding described image analysing computer unit.
7. display device as claimed in claim 5, wherein when described image color range value during less than described image brilliance reference value, described image color range reference value is obtainable largest image color range value, and the described second brightness adjusted value can be resultant by following formula:
L
2＝B*[1-(Lv-Lv
min)/Lv
max]，
L wherein
2Be the described second brightness adjusted value, Lv is described image color range value, Lv
MaxBe an obtainable largest image color range value, Lv
MinBe obtainable one minimum image color range value, B is the brightness-adjusting value range of corresponding described image analysing computer unit.
8. display device luminance regulating method, described display device can receive and show a signal of video signal, said method comprising the steps of:
Detect an ambient brightness to calculate one first brightness adjusted value;
Analyze described signal of video signal to obtain an image color range value;
Calculate one second brightness adjusted value according to described image color range value;
Described first brightness adjusted value of foundation and the described second brightness adjusted value are to determine a final brightness adjusted value; And
Adjust the brightness of described display screen according to described final brightness adjusted value;
Wherein said final brightness adjusted value can be resultant by following formula:
L＝L
1±L
2+S，
Wherein L is described final brightness adjusted value, L
1Be the described first brightness adjusted value, L
2Be the described second brightness adjusted value, S is a luminance compensation value.
9. method as claimed in claim 8 is wherein when described display device starts an energy saver mode, by described first brightness adjusted value and the described second brightness adjusted value are subtracted each other, to downgrade described final brightness adjusted value.
10. method as claimed in claim 8, wherein when pattern is viewed and admired in described display device startup one, can be according to the decision of described image color range value with described first brightness adjusted value and the described second brightness adjusted value addition or subtract each other, to adjust described final brightness adjusted value.
11. method as claimed in claim 8, the wherein said first brightness adjusted value can be resultant by following formula:
L
1＝(B
max-B
min)*(Le-Le
min)/(Le
max-Le
min)+B
min，
L wherein
1Be the described first brightness adjusted value, Le is described ambient brightness, Le
MaxBe detectable one maximum ambient brightness, Le
MinBe detectable one minimum ambient brightness, B
MaxBe an adjustable high-high brightness limit value, B
MinBe an adjustable minimum brightness limit value.
12. method as claimed in claim 8 wherein can be set an image color range reference value with the judgment standard as described image color range value, described image color range reference value is between 0 to 255.
13. method as claimed in claim 12, wherein when described image color range value during more than or equal to described image color range reference value, described image color range reference value is obtainable minimum image color range value, and the described second brightness adjusted value can be resultant by following formula:
L
2＝B*(Lv-Lv
min)/Lv
max，
L wherein
2Be the described second brightness adjusted value, Lv is described image color range value, Lv
MaxBe an obtainable largest image color range value, Lv
MinBe obtainable one minimum image color range value, B is the brightness-adjusting value range of corresponding described image analysing computer unit.
14. method as claimed in claim 12, wherein when described image color range value during less than described image brilliance reference value, described image color range reference value is obtainable largest image color range value, and the described second brightness adjusted value can be resultant by following formula:
L
2＝B*[1-(Lv-Lv
min)/Lv
max]，
L wherein
2Be the described second brightness adjusted value, Lv is described image color range value, Lv
MaxBe an obtainable largest image color range value, Lv
MinBe obtainable one minimum image color range value, B is the brightness-adjusting value range of corresponding described image analysing computer unit.
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| CN101814272A (en) | 2010-08-25 |
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