CN101414438B - Apparatus and method for dynamically controlling backlight source - Google Patents
Apparatus and method for dynamically controlling backlight source Download PDFInfo
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Abstract
A dynamic backlight source control device is used for receiving a pixel input data to output a pixel output data and a pulse width modulation (PWM) signal. The device comprises an image analysis unit which receives the pixel input data, and outputs an image data after analyzing the image; a data unit which stores a relational data in relation to a brightness adjustment data and a PWM adjustment data within a gray scale range; a brightness computing unit which receives the image data and the relational data of the data unit, computes a required gray scale value corresponding to the required brightness, and also respectively outputs a required pixel brightness data and a required PWM data according to the required gray scale value; a PWM adjustment unit which receives the needed PWM data to output the PWM signal; and a multiplication unit which receives the pixel input data, and adjusts the brightness based on the required pixel brightness data to output the pixel output data.
Description
Technical field
The present invention relates to the adjustment technology in a kind of display backlight source, and particularly relate to a kind of technology of dynamic backlight source control, it cooperates the pixel gray level value of control display panel, to reach the backlight less electricity consumption.
Background technology
The general display that adopts the light source passive type, for example LCD needs to use a backlight module as light source.Fig. 1 shows the display mechanism synoptic diagram of conventional liquid crystal.Consult Fig. 1, traditional LCD comprises a display panel 102, an array of pixels is arranged to show an image above it.Each pixel of array of pixels generally is made up of red green blue tricolor.For example form a pixel, penetrate control module (Tcon) 104 by one, want GTG value (graylevel), control the penetrance of three inferior pixels of RGB respectively according to image by three of RGBs time pixels.
Because liquid crystal panel 102 itself is not luminous, therefore also need a backlight module 100 for example to produce white light.White light passes three pixels of RGB, according to the pixel penetrance, produces primaries to blend desired color, sees the view picture for human eye 106.
In traditional display mode, backlight module 100 is white lights that send constant intensity, and the GTG value by changing pixel to be changing brightness, and then presents the variation of color.Mode so, backlight module 100 all maintains under the maximum brightness luminous, and its work ratio (duty cycle) is 100%.Therefore, traditional approach is power consumption very, and the effect that how to reach power saving still is to continue a problem of research and development.Particularly, need less electricity consumption especially, to extend working time for the mobile device that uses battery.
Summary of the invention
The invention provides a kind of dynamic backlight source control device and method, it can dynamically adjust the work ratio of backlight module, to reach the effect of power saving.
The present invention proposes a kind of dynamic backlight source control device, in order to receive pixel input data to export a pixel data output and a pulse-length modulation (PWM) signal.This device comprises an image analyzing unit, receives pixel input data, carries out exporting a view data after the graphical analysis.It is that data and PWM adjustment data are adjusted in a brightness that corresponds to a grey-scale range that one data cell is stored a relation data.One brightness calculation unit receives the relation data of view data and data cell, and calculates a required GTG value of corresponding required brightness, also exports a required pixel brightness data and required PWM data respectively according to required GTG value.One PWM adjustment unit receives required PWM data, with output pwm signal.One multiplication unit receives pixel input data and does the brightness adjustment to export this pixel data output according to this required pixel brightness data.
According to one embodiment of the invention, in above-mentioned backlight arrangement, for example the relation data of data cell is a color illuminometer and a power modulation table.
According to one embodiment of the invention, in above-mentioned backlight arrangement, for example the relation data of this data cell is single consolidated statement, according to this grey-scale range being distinguished into a low scope and a high scope, storing this brightness respectively and adjusts data and this PWM adjustment data.
According to one embodiment of the invention, in above-mentioned backlight arrangement, for example described low scope, corresponding lower GTG value.
According to one embodiment of the invention, in above-mentioned backlight arrangement, for example described low scope is in the lower GTG value of described grey-scale range correspondence, and is to set according to a PWM minimum.
According to one embodiment of the invention, in above-mentioned backlight arrangement, for example each the PWM value in described low scope is to be fixed on the PWM minimum, and the variation of input data luminance presents the brightness variation to adjust data.
According to one embodiment of the invention, in above-mentioned backlight arrangement, for example the high-high brightness in described high scope is adjusted into the maximum gray value, and adjustment PWM value presents the brightness variation.
According to one embodiment of the invention, in above-mentioned backlight arrangement, for example, after described brightness calculation unit calculates described required GTG value, according to described low scope and described high scope, export described required pixel brightness data and described required PWM data respectively to described multiplication unit and described PWM adjustment unit.
According to one embodiment of the invention, in above-mentioned backlight arrangement, for example comprise more that a divider is connected between described brightness calculation unit and the described multiplication unit, obtain a multiplier value and give described multiplication unit.
The present invention also proposes a kind of dynamic backlight source control device, receives pixel input data to export a pixel data output and a pulse-length modulation (PWM) signal.This device comprises an image analyzing unit, receives pixel input data, output one view data after graphical analysis.One data storage cell is stored a brightness and is adjusted data and adjust data with a PWM, wherein to a grey-scale range that should pixel input data, is set with two parts of a low grey-scale range and a high gray scope.Adjusting data in this brightness of this high gray scope is fixed maximum values, and adjusting data at this PWM of this low grey-scale range is fixing minimum value.One lookup unit is inquired about described brightness and is adjusted data and described PWM adjustment data, to obtain a required pixel brightness data and required PWM data.One PWM adjustment unit receives required PWM data, to export this pwm signal.One multiplication unit receives pixel input data and does the brightness adjustment with the output pixel output data according to this required pixel brightness data.。
The present invention also proposes a kind of method of dynamic backlight source control, in order to receive pixel input data to export a pixel data output and a pulse-length modulation (PWM) signal.Described method comprises provides an image analyzing unit, receives described pixel input data, to carry out exporting a view data after the graphical analysis.Store a relation data in a data cell, described relation data is that data and PWM adjustment data are adjusted in a brightness that corresponds to a grey-scale range.Carry out a brightness calculation according to described view data and described relation data, to obtain a required GTG value of corresponding required brightness.According to described required GTG value, obtain a required pixel brightness data and required PWM data respectively.Provide a PWM adjustment unit, to receive described required PWM data, the described pwm signal of corresponding output.Provide a multiplication unit, to receive described pixel input data and to do the brightness adjustment to export described pixel data output according to described required pixel brightness data.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 shows the display mechanism synoptic diagram of conventional liquid crystal.
Fig. 2 shows according to one embodiment of the invention, a kind of circuit box synoptic diagram of dynamic backlight source control device.
Fig. 3 shows according to one embodiment of the invention, the content of gamma table 114 and PWM table 116.
Fig. 4 shows according to one embodiment of the invention, a kind of circuit box synoptic diagram of dynamic backlight source control device.
Fig. 5 shows according to one embodiment of the invention, a kind of circuit box synoptic diagram of dynamic backlight source control device.
Fig. 6 shows according to one embodiment of the invention, a kind of circuit box synoptic diagram of dynamic backlight source control device.
The reference numeral explanation
100: backlight module
102: display panel
104: penetrate control module
106: human eye
110,150: image analyzing unit
112,152: the brightness calculation unit
114: gamma table
The 116:PWM table
118,156:PWM work ratio circuit box
120,160: divider
122,158: multiplication unit
154: consolidated statement
162a:PWM exports table unit
162b: multiplier table unit
163a: lookup unit
163b: lookup unit
164: the brightness calculation unit.
Embodiment
The present invention summarizes a brightness relationship formula after the needed brightness generation mechanism of display image is done labor, promptly is
(1)L＝b*t
Wherein, the needed brightness of L represent pixel, the intensity of light source that on behalf of backlight module, b provide, the penetrance of t represent pixel, the GTG value (being pixel data) that it is corresponding required.As previously mentioned, in traditional mechanism, b is a fixed value, total be exactly the full integrated brightness when bright of backlight module, its corresponding display cycle all maintains equal state, in other words, backlight module can be kept the state of work ratio 100% always, and does not have any change.This has caused the situation of backlight module power consumption.
The present invention proposes dynamically to adjust the b value of backlight module after going into seriously traditional problem, promptly be the work ratio of dynamically adjusting backlight module, its corresponding parameter b.But because the actual needed brightness of pixel still need be kept to produce desired color, the original GTG value that therefore also needs to change pixel becomes the needed GTG value of cooperation backlight module work ratio, and corresponding parametric t is to reach actual needed brightness L.Below for some embodiment as description of the invention, but the present invention be not subject to for some embodiment.And for some embodiment also can do suitable combination mutually, be not limited to other embodiment.
Fig. 2 shows according to the embodiment of the invention, a kind of circuit box synoptic diagram of dynamic backlight source control device.Consult Fig. 2, dynamic backlight source control device is imported corresponding RGB (RGB) data in order to receive pixel, handles the back by analysis with output pixel output data and a pulse-length modulation (PWM) signal.This device comprises an image analyzing unit 110, is used for receiving pixel input data, and carries out exporting a view data after the graphical analysis.One data cell is stored a relation data.This relation data is that data 114 and PWM adjustment data 116 are adjusted in a brightness that corresponds to a grey-scale range.Grey-scale range for example be one by black to white scope.It for example is gamma table 114 that data 114 are adjusted in brightness, in order to carry out brightness correction.PWM adjusts data 116, for example is PWM table, in order to the work ratio of control backlight module, after the mutual relationship between itself and the gamma table will be described in.
Then, one brightness calculation unit (Luminance Calculation Unit) 112 receives by the view data of image analyzing unit 110 outputs and data 114 are adjusted in brightness and a PWM adjusts data 116, and, calculate a required GTG value of the required brightness of corresponding input according to the principle of formula (1).Again, also according to the size of required GTG value, according to gamma table 114 and PWM table 116, export a required pixel brightness data and required PWM data respectively.One PWM work ratio circuit box (Adjust PWMDuty Cycle Unit) 118 receives required PWM data, with output pwm signal, with the work ratio of the PWM that adjusts backlight module.One multiplication unit 122 receives pixel input data and finds the needed brightness adjustment of corresponding required pixel brightness data multiplier according to this by gamma table 114, pixel is imported data be multiplied by its brightness adjustment multiplier, output pixel output data afterwards; Thus, the synthetic effect of pixel data output and adjusted PWM work ratio just can meet original needed brightness.In addition,, in the present embodiment, can increase by a divider 120 in addition, to adjust the usefulness of the correction of multiplier as brightness in order to cooperate the operation of multiplication unit 122.
Fig. 3 shows according to the embodiment of the invention, the content of gamma table 114 and PWM table 116.Consult Fig. 3, the content of gamma table 114 for example is pixel input data and brightness value (G), promptly is the gamma curve that brightness correction is used.The content of PWM table 116 for example is the relation curve of brightness value (G) and PWM value.By preceding described, by gamma table 114 and PWM table 116, brightness calculation unit 112 just can calculate required pixel data output and required PWM work ratio; Yet for the embodiment of Fig. 2, its relation data is to store with two tables of data, therefore needs the desired data of bigger memory size with storage map 3.
The present invention makes the relation table that Several principles is simplified required foundation again, to replace PWM table and gamma table originally.At first, note that at this pixel data value of output is that the pixel data value of importing is multiplied by a multiplier value (k), k=output data/input data.L (total brightness)=b (the peaked brightness value of PWM) * t (brightness value of the pixel data of input)=b (the amended brightness value of PWM) * t (brightness value of the pixel data of output) again.This expression, the b of traditional mechanism such as last equation is set in the PWM maximal value.In order to save energy, the present invention can pass through to adjust t (pixel data of output), and changes b (PWM of output) accordingly, and so the work ratio of backlight module can reduce, also therefore can power saving.
In general, the adjustment of backlight illumination can be set some restrictions; Therefore in present embodiment, the scope of suppose PWM is by 0 to 255 expression, and the minimum value that hypothesis PWM sets is 64, and the PWM maximal value is 255, in addition, arrives the deceiving of corresponding output white input grey-scale range also with 0 to 255 expression.Note that at this aforesaid PWM maximal value 255 only is the usefulness of explanation with minimum value 64, but not restriction of the present invention; That is in actual applications, the dealer can set up required maximal value and minimum value on their own.
From the PWM table of Fig. 3, the brightness value of learning PWM minimum value 64 correspondences of tabling look-up for example is 67.Then, learn that from gamma table the pixel input value of corresponding brightness value 67 is 126 as a diacritical point.That is, in the present embodiment, when the pixel input value below 126, the present invention is that the value with PWM is set in minimum value 64, to utilize output data to meet required brightness, thus, because the value of PWM is maintained at minimum value 64, therefore just can reach best power saving effect; And for the pixel input value greater than the situation more than 126, because at this moment required brightness is bigger, if the value of PWM is maintained at minimum value, just can't meet required brightness, therefore, in this case, the present invention is set at maximal value 255 with output data, so just can reach best power saving effect.
As previously mentioned, in order to reach the optimization of power saving, the present invention imports data area with pixel and is distinguished into two scopes, is called low scope and high scope at this, and according to aforesaid mechanism, just all corresponding relations can be based upon in the question blank.See also table one, it has listed pixel input data, PWM value, multiplier value (k), and the corresponding relation of pixel data output.
According to aforesaid principle, it is 64 that the PWM value of output has the PWM minimum value, and the PWM maximal value is 255, and wherein, the grey-scale range of pixel input data is with 126 as a diacritical point, so grey-scale range is distinguished low scope and high scope are arranged.
The situation of low scope at first is discussed, as previously mentioned, when pixel input data less than or when equaling 126, the PWM value of output can be set in PWM minimum value 64.
By aforesaid formula as can be known, L (total brightness)=b (the peaked brightness value of PWM) * t (brightness value of the pixel data of input)=b (the amended brightness value of PWM) * t (brightness value of the pixel data of output), therefore, in the situation of low scope, L=b (255) * t (input)=b (64) * t (output), hence one can see that, and we can pass through following formula, calculates the required output pixel data of corresponding each input pixel data.In addition, because therefore multiplier value (k)=output data/input data also can be calculated multiplier value easily.
Note that for less input data at this, for example in the scope of 0-16 because output can be in state of saturation, thus the present invention directly to set the output data of this moment be 32.And other corresponding output data all can be calculated by following formula, to build in the question blank 1.
For instance, if the input data are 18, just can be with this substitution following formula, L=b (255) * t (18)=b (64) * t (output), so just, can extrapolate t (output)=b (255) * t (18)/b (64), just can be again by the anti-data output=t that releases desire output of gamma table
-1[b (255) * t (18)/b (64)] is 45.Thus, just can extrapolate multiplier value (k)=45/18=2.5.
Table one
| The input data | The PWM value | Multiplier value (k) | Output data |
| 0 | 64 | 32 | 32 |
| 1 | 64 | 16.1 | 32 |
| 2 | 64 | 10.5 | 32 |
| 3 | 64 | 8 | 32 |
| . . . | . . . | . . . | . . . |
| 16 | 64 | 2 | 32 |
| 17 | 64 | 2.64 | 45 |
| 18 | 64 | 2.5 | 45 |
| The input data | The PWM value | Multiplier value (k) | Output data |
| . . . | . . . | . . . | . . . |
| 125 | 64 | 1.99 | 249 |
| 126 | 64 | 2.02 | 255 |
| 127 | 65 | 2 | 255 |
| 128 | 66 | 1.99 | 255 |
| . . . | . . . | . . . | . . . |
| 252 | 249 | 1.02 | 255 |
| 253 | 251 | 1.02 | 255 |
| 254 | 253 | 1.01 | 255 |
| 255 | 255 | 1.01 | 255 |
Under the pixel input value is situation in high scope, promptly be the scope more than 127, as previously mentioned, in order to reach best power saving effect, the pixel output valve can be set in maximum penetrance 255.Therefore, be 127 to be example with the pixel input value, the numerical value of multiplier value (k) can obtain k=2.02 divided by pixel input value (127) by pixel output valve (255), therefore need not set up especially.Yet when the pixel output valve was set in maximal value (255), output PWM value can downgrade relatively, to keep former predetermined brightness, therefore needed to set up output PWM value table.
For instance, if the pixel data of input is 252, the aforesaid equation L=b of substitution (255) * t (252)=b (PWM output) * t (255) so, because b (255), t (252), t (255) are known, therefore just can release the numerical value of b (PWM output), and and then learn that the required output valve of PWM is 249.
Disclose so far, this field has knows that usually the knowledgeable should understand, and question blank 1 is set up, so the account form of the related data of corresponding other input data is not just given unnecessary details in this in addition.
Please note at this, in the embodiment of Fig. 2, brightness calculation unit 112 is to utilize PWM table 116 and gamma table 114, with according to the input data, calculate required pixel data output and PWM output (be equivalent to and calculate PWM value listed in the table one, multiplier value (k), output data in real time) in real time.Yet, in another embodiment of the present invention, also these data can be stored as showing in advance, thus, just need not calculate in real time according to the input data at every turn, and only must just information such as required PWM value, multiplier value (k), output data can be read out via question blank one.
See also Fig. 4, Fig. 4 is the circuit box synoptic diagram of the dynamic backlight source control device of another embodiment of the present invention.In the present embodiment, the dynamic backlight source control device can be a mechanism of using two charts simultaneously.Wherein, PWM output table unit 162a includes two fields importing data and PWM value in the table one; And multiplier table unit 162b includes two fields of input data and multiplier value (k).Therefore, image analyzing unit 150 can directly be exported and analyze data to two lookup unit 163a, 163b, inquire about PWM output table unit 162a and multiplier table unit 162b respectively accordingly, with export accordingly respectively required PWM value to PWM work ratio circuit box 156 and required multiplication value to multiplication unit 158.Again, according to the variation of actual design, two lookup unit 163a, 163b also can be integrated into a lookup unit, so that PWM output table unit 162a and multiplier table unit 162b are inquired required data.
In addition, the present invention in addition can be with table one more to simplify.Note that owing to be distinguished into two pixel input ranges according to display characteristic at this, all is in minimum value 64 for the PWM output valve of low scope, need not special storage.Multiplier value (k) for high scope is the ratio of unalterable rules, need not special storage.Therefore, further save under the considering of internal memory and table one can be simplified to single consolidated statement, as shown in Table 2.
Table two
| The input data | Multiplier value and PWM value |
| 0 | 32 |
| 1 | 16.1 |
| 2 | 10.5 |
| 3 | 8 |
| . | . |
| . | . |
| . | . |
| 16 | 2 |
| 17 | 2.64 |
| 18 | 2.5 |
| . | . |
| . | . |
| . | . |
| 125 | 1.99 |
| The input data | Multiplier value and |
| 126 | 2.02 |
| 127 | 65 |
| 128 | 66 |
| . | . |
| . | . |
| . | . |
| 252 | 249 |
| 253 | 251 |
| 254 | 253 |
| 255 | 255 |
By table two as can be seen, the data of required storage only are consolidated statements of 255 data.When importing data in low scope, for example be that the storage data content in the 0-126 scope is the data of multiplier value (k) wherein, the input data for example are that the storage data content in the 127-255 scope is the data of PWM output valve in high scope.Therefore, also reduce effectively in order to storage list two required memory sizes.
The characteristic that cooperates table two, Fig. 2 or the embodiment of Fig. 4 just can streamline any further.Fig. 5 shows according to another embodiment of the present invention, a kind of circuit box synoptic diagram of dynamic backlight source control device.Consult Fig. 5, compared to the circuit box of Fig. 2, the consolidated statement of present embodiment (General Table) 154 for example is to set up according to the data of table two to comprise multiplier value and PWM value.Brightness calculation square 152 can be given adjustment PWM work ratio circuit box 156 by consolidated statement 154 is exported corresponding data in the mode of tabling look-up, and then exports adjusted PWM output; Again or the export multiplier value give multiplier 158, to obtain adjusted pixel output.As for divider 160 is to cooperate the calculating of brightness calculation 152 just to need according to the content of consolidated statement (General Table) 154.In another preferred embodiment of the present invention, can also contraction in division device 160.In addition, image analyzing unit 150 is the same with the image analyzing unit 110 of previous Fig. 2.Therefore, the circuit structure of Fig. 5 more can be simplified the foundation of relation database table, to save the use of internal memory.
Further again, the structure of Fig. 5 more is simplified to the mechanism of tabling look-up and gets final product.As long as that is to say the work of brightness calculation 152 can find the needed output data of corresponding input pixel from consolidated statement 154 and give adjustment PWM work ratio circuit box 156 and divider 160 respectively.In this, divider 160 for example in high scope, calculates multiplier value according to unalterable rules and gives multiplier 158, makes the pixel penetrance maintain maximal value after adjusting, and it belongs to the high scope in table two.Because of the pixel penetrance fixedly maintains maximal value, the data that therefore will present the brightness variation are to reach by dynamic adjustment PWM value.
Under the mechanism based on single integrated table, Fig. 6 shows according to the embodiment of the invention again, a kind of circuit box synoptic diagram of dynamic backlight source control device.Consult Fig. 6, after brightness calculation unit 164 receives image analyzing unit 150, learn and to export to the PWM work ratio circuit box 156 or the data of multiplication unit 158.Can and cooperate the content of consolidated statement 154 do the design of circuit according to actual function as for the content of brightness calculation unit 164, be not limited to particular electrical circuit, also the use that therefore can save divider.In other words, under identical operations mechanism, circuit design, and the conversion in advance of consolidated statement 154 numerical value all are to change according to actual design, do not enumerate one by one.
Under identical required brightness, change the GTG value that increases former pixel count certificate in the present invention, therefore allow to reduce the intensity of backlight.The change of the intensity of backlight is to reach by adjusting work ratio.Again, relation table also can be simplified to single integrated table, also therefore saves memory size.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the claim person of defining of the present invention.
Claims (21)
1. a dynamic backlight source control device receives pixel input data to export a pixel data output and a pulse width modulating signal, and this device comprises:
One image analyzing unit receives this pixel input data, carries out exporting a view data after the graphical analysis;
One data cell, storing a relation data is that data and pulse-length modulation adjustment data are adjusted in a brightness that corresponds to a grey-scale range;
One brightness calculation unit, receive this relation data of this view data and this data cell, calculate a required GTG value of corresponding required brightness, and export a required pixel brightness data and required pulse-length modulation data respectively according to this required GTG value;
One pulse-length modulation adjustment unit receives this required pulse-length modulation data, to export this pulse width modulating signal; And
One multiplication unit receives these pixel input data and according to this required pixel brightness data pixel input data is done the brightness adjustment, to export this pixel data output.
2. dynamic backlight source control device as claimed in claim 1, wherein, this relation data of this data cell is a color illuminometer and a power modulation table.
3. dynamic backlight source control device as claimed in claim 1, wherein, this relation data of this data cell is single consolidated statement, according to this grey-scale range being distinguished into a low scope and a high scope, storing this brightness respectively and adjusts data and this pulse-length modulation adjustment data.
4. dynamic backlight source control device as claimed in claim 3, wherein, this low scope in this grey-scale range, corresponding lower GTG value.
5. dynamic backlight source control device as claimed in claim 3, wherein, this low scope is a GTG value corresponding lower in this grey-scale range, and is to set according to a pulse-length modulation minimum.
6. dynamic backlight source control device as claimed in claim 3 wherein, is a pulse-length modulation minimum in each pulse-length modulation value of this low scope, and adjusts data with this brightness and present brightness and change.
7. dynamic backlight source control device as claimed in claim 3 wherein, is a maximum gray value at each this pixel data output of this high scope, and adjusts data with this pulse-length modulation and present brightness and change.
8. dynamic backlight source control device as claimed in claim 3, wherein, after this brightness calculation unit calculates this required GTG value, according to this low scope and this high scope, this required pixel brightness data of output and this required pulse-length modulation data are to this multiplication unit and this pulse-length modulation adjustment unit respectively.
9. dynamic backlight source control device as claimed in claim 1 more comprises a divider, is connected between this brightness calculation unit and this multiplication unit, obtains a multiplier value and gives this multiplication unit.
10. a dynamic backlight source control device receives pixel input data to export a pixel data output and a pulse width modulating signal, and this device comprises:
One image analyzing unit receives this pixel input data, carries out exporting a view data after the graphical analysis;
One data storage cell, store a brightness and adjust data and pulse-length modulation adjustment data, wherein, to should pixel one grey-scale range of input data, be set with two parts of a low grey-scale range and a high gray scope, wherein, adjusting data in this brightness of this high gray scope is fixed maximum values, and adjusting data in this pulse-length modulation of this low grey-scale range is fixing minimum value;
One lookup unit is inquired about this brightness and is adjusted data and this pulse-length modulation adjustment data, to obtain a required pixel brightness data and required pulse-length modulation data;
One pulse-length modulation adjustment unit receives this required pulse-length modulation data, to export this pulse width modulating signal; And
One multiplication unit receives these pixel input data and does the brightness adjustment to export this pixel data output according to this required pixel brightness data.
11. dynamic backlight source control device as claimed in claim 10, wherein, this low grey-scale range in this grey-scale range, corresponding lower GTG value.
12. dynamic backlight source control device as claimed in claim 10, wherein, this low grey-scale range is a GTG value corresponding lower in this grey-scale range, and is to set according to a pulse-length modulation minimum.
13. dynamic backlight source control device as claimed in claim 10 wherein, is a pulse-length modulation minimum in each pulse-length modulation value of this low grey-scale range, and adjusts data with this brightness and present brightness and change.
14. dynamic backlight source control device as claimed in claim 10 wherein, is a maximum gray value at each this pixel data output of this high gray scope, adjusts data with this pulse-length modulation and presents brightness and change.
15. the method for a dynamic backlight source control, in order to receive pixel input data to export a pixel data output and a pulse width modulating signal, this method comprises:
One image analyzing unit is provided, receives this pixel input data, to carry out exporting a view data after the graphical analysis;
Store a relation data in a data cell, this relation data is that data and pulse-length modulation adjustment data are adjusted in a brightness that corresponds to a grey-scale range;
Carry out a brightness calculation according to this view data and this relation data, to obtain a required GTG value of corresponding required brightness;
According to this required GTG value, obtain a required pixel brightness data and required pulse-length modulation data respectively;
Provide a pulse-length modulation adjustment unit, to receive these required pulse-length modulation data, corresponding this pulse width modulating signal of output; And
Provide a multiplication unit, to receive these pixel input data and to do the brightness adjustment to export this pixel data output according to this required pixel brightness data.
16. the method for dynamic backlight source control as claimed in claim 15, wherein, this relation data of this data cell is single consolidated statement, according to this grey-scale range being distinguished into a low scope and a high scope, storing this brightness respectively and adjusts data and this pulse-length modulation adjustment data.
17. the method for dynamic backlight source control as claimed in claim 16, wherein, this low scope is about half of this grey-scale range, corresponding lower GTG value.
18. the method for dynamic backlight source control as claimed in claim 16, wherein, this low scope is in the lower GTG value of this grey-scale range correspondence, and is to set according to a pulse-length modulation minimum.
19. the method for dynamic backlight source control as claimed in claim 16 wherein, is a pulse-length modulation minimum in each pulse-length modulation value of this low scope, and adjusts data with this brightness and present brightness and change.
20. the method for dynamic backlight source control as claimed in claim 16 wherein, is a maximum gray value at each this pixel data output of this high scope, adjusts data with this pulse-length modulation and presents brightness and change.
21. the method for dynamic backlight source control as claimed in claim 15, wherein, obtain respectively according to this required GTG value after the step of this required pixel brightness data and these required pulse-length modulation data, this required pixel brightness data of output arrives this pulse-length modulation adjustment unit to this multiplication unit and this required pulse-length modulation data respectively.
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| KR101329966B1 (en) | 2009-09-22 | 2013-11-20 | 엘지디스플레이 주식회사 | Appratus and method for controlling brightness of organic light emitting diode display |
| TWI443633B (en) | 2011-01-17 | 2014-07-01 | Hongda Liu | Liquid crystal display apparatus |
| CN102737585A (en) * | 2011-04-06 | 2012-10-17 | 中兴通讯股份有限公司 | Method for reducing backlight power consumption of display device and apparatus thereof |
| CN102314838B (en) * | 2011-09-29 | 2014-05-07 | 福州大学 | Method for controlling direct-type LED backlight uniformity and system thereof |
| CN102347014B (en) * | 2011-10-25 | 2016-09-14 | 中兴通讯股份有限公司 | A kind of method and device of adjusting backlight brightness of display panel |
| US9843317B2 (en) | 2014-09-15 | 2017-12-12 | Xiaomi Inc. | Method and device for processing PWM data |
| CN104378090B (en) * | 2014-09-15 | 2017-02-15 | 小米科技有限责任公司 | PWM data processing method and device |
| CN104599642B (en) * | 2014-12-31 | 2017-05-03 | 小米科技有限责任公司 | Backlight control method and backlight control device |
| CN107507577A (en) * | 2016-06-14 | 2017-12-22 | 青岛海信电器股份有限公司 | Method for controlling backlight thereof and device |
| CN109427274B (en) * | 2017-08-24 | 2020-12-04 | 深圳光峰科技股份有限公司 | Display system and method with high contrast |
| CN108335677B (en) * | 2018-02-11 | 2019-12-24 | 京东方科技集团股份有限公司 | Luminance compensation method, luminance compensation device, and display device |
| CN109272917B (en) * | 2018-10-25 | 2021-09-28 | Oppo广东移动通信有限公司 | Screen brightness adjusting method and device, storage medium and electronic equipment |
| CN109360530B (en) * | 2018-10-30 | 2023-06-27 | 武汉华星光电技术有限公司 | Liquid crystal display device and backlight control method thereof |
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