WO2010134600A1 - 輝度制御装置、これを用いた表示装置、輝度制御方法及び輝度制御プログラム - Google Patents
輝度制御装置、これを用いた表示装置、輝度制御方法及び輝度制御プログラム Download PDFInfo
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- WO2010134600A1 WO2010134600A1 PCT/JP2010/058638 JP2010058638W WO2010134600A1 WO 2010134600 A1 WO2010134600 A1 WO 2010134600A1 JP 2010058638 W JP2010058638 W JP 2010058638W WO 2010134600 A1 WO2010134600 A1 WO 2010134600A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0238—Improving the black level
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0653—Controlling or limiting the speed of brightness adjustment of the illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
Definitions
- the present invention relates to a luminance control device capable of reducing power consumption by controlling the light source luminance of a backlight such as a liquid crystal panel, a display device using the same, a luminance control method, and a luminance control program.
- a type of display in which the display panel for displaying an image does not emit light
- a light source is disposed on the back of the display panel in order to provide brightness.
- the light source occupies most of the power consumption. Therefore, monitoring the luminance fluctuation of the input video, detecting the timing when the luminance change is difficult to perceive due to human visual characteristics, and reducing the luminance of the light source according to the timing, it is considered to reduce the power consumption. It has been.
- Patent Document 1 discloses a display device that can reduce power consumption by reducing brightness within a range that does not cause a sense of incongruity when the image is visually not significantly changed even when the brightness is reduced. Is described.
- FIG. 19 is a diagram showing an example of four display images having different average luminance levels and peak luminance levels.
- the display image 101 has a high average luminance level and a low peak luminance level
- the display image 102 has a high average luminance level and a high peak luminance level
- the display image 103 has a low average luminance level and a high peak luminance level.
- the low display image and the display image 104 are display images having a low average luminance level and a high peak luminance level.
- a display image having a low average luminance level and a high peak luminance level such as the display image 104, is low so that there is no significant visual change on the display screen even when the luminance is reduced. Considering this as a change image, this display image is detected to reduce the luminance.
- Patent Document 1 has extremely limited opportunities for luminance reduction, and can be applied only to the display image 104 having a low average luminance level and a high peak luminance level. In this case, the effect of reducing power consumption is also limited.
- the present invention provides a luminance control device that reduces power consumption by reducing the light source luminance of a backlight in accordance with the variability of the luminance of an image displayed on a display panel.
- Display device, luminance control method, and luminance control program are included in the present invention.
- the present invention relates to a luminance control device that controls the luminance of a light source that is a backlight of a display panel, and detects a luminance of an input video signal, and is detected by the video luminance detection unit.
- Variability indicating the intensity of fluctuation of the video brightness using the video brightness storage unit that stores the video brightness for a certain period, the video brightness, and the video brightness history stored in the video brightness storage unit
- a calculation unit that outputs a light source luminance control signal that determines the luminance of the light source determined from the video luminance and the variability.
- the arithmetic unit is characterized in that when the variability is higher than a preset first predetermined value, the light source luminance is reduced regardless of the video luminance.
- the calculation unit reduces the light source luminance when the variability is lower than a second predetermined value set in advance and the video luminance is higher than a first threshold.
- the present invention includes an image processing unit that obtains a compensated video signal in which the video luminance is increased so as to compensate for the reduction in the light source luminance with respect to the video in which the light source luminance is reduced, and the arithmetic unit adjusts the luminance of the compensated video signal. Accordingly, the light source luminance is further reduced.
- the present invention is characterized by including a synchronization processing unit that delays an input video signal in accordance with a delay caused by a light source luminance control process and synchronizes with the light source luminance control signal.
- the calculation unit calculates the directionality of the fluctuation of the video luminance, and if the directionality of the fluctuation tends to decrease, the calculation unit increases the reduction amount of the light source luminance, and if the directionality of the fluctuation tends to increase, the light source It is characterized by refraining from a reduction in luminance.
- the calculation unit calculates the directionality of the change in the video luminance, and when the change in the directionality of the change sequentially changes from an upward trend to a downward trend, the light source luminance reduction amount is increased. To do.
- the calculation unit calculates the directionality of the change in the video luminance, and if the change directionality changes from a downward trend to no directionality and then an upward trend in order, refrain from reducing the light source luminance.
- the present invention also includes the brightness control device, a display panel, a light source disposed in the vicinity of the display panel, and a light source control unit that controls the light source according to a light source brightness control signal from the brightness control device. And a display unit.
- the present invention also relates to a brightness control method for controlling the brightness of a light source that is a backlight of a display panel, the brightness detecting method for detecting the brightness of an input video signal, and detection in the video brightness detecting step.
- the intensity of fluctuation of the video brightness is stored using the video brightness storage step for storing the received video brightness for a certain period, the video brightness, and the video brightness history stored in the video brightness storage step.
- the present invention is a brightness control program that causes a control device to execute the brightness control method.
- the present invention by analyzing the variability of the video brightness, it is possible to reduce the light source brightness without giving a large visual change, and it is possible to increase the opportunity to reduce the light source brightness than before, It becomes possible to further reduce power consumption.
- the luminance of the light source can be reduced and the power consumption can be reduced.
- the luminance in addition to the light source luminance control, the luminance can be further reduced by taking the direction of the fluctuation into consideration, and the power consumption can be reduced.
- the reduction of the light source luminance in accordance with the transition of the direction of variation it is possible to secure a contrast and realize an easy-to-view display without degrading the video quality.
- the present invention reduces the luminance of a backlight light source arranged in the vicinity of a display panel that does not emit light in order to reduce power consumption.
- the luminance of the image is analyzed to obtain the variability of the luminance, and the variability of the backlight is used to reduce the light source luminance of the backlight within a range where it is difficult to visually perceive.
- FIG. 1 shows the relationship between the sensitivity of perceiving luminance change and the frequency of luminance change. Sensitivity for perceiving a luminance change indicates the minimum amount of luminance change that can be perceived by humans.
- FIG. 1A shows a case where the display average luminance is low, and a high frequency (very rapid) variation in luminance is hardly perceived (range 5 in which it is difficult to perceive).
- FIG. 1B shows a case where the display average luminance is high, and when the display average luminance is high, a high frequency (very rapid) variation and a low frequency (very gentle) variation are not easily perceived (range where it is difficult to perceive). 5).
- the display image that can reduce the display brightness is detected and the light source brightness is reduced.
- embodiments will be described.
- FIG. 2 is a block diagram illustrating the display device according to the first embodiment.
- the display device 10 includes a display unit 20 and a luminance control unit 30.
- the display unit 20 includes a display panel 21, a light source 22, and a light source control unit 23.
- the luminance control unit 30 includes a video luminance detection unit 31, a video luminance storage unit 32, and a calculation unit 33.
- the display panel 21 of the display unit 20 is a non-self-luminous display such as a liquid crystal and modulates the light from the light source 22 to display an image.
- the light source 22 disposed on the back surface of the display panel 21 is generally called a backlight, and may be any type as long as it can adjust the luminance of a cold cathode tube, an LED, etc., and the type is not particularly selected.
- the light source control unit 23 controls the luminance of the light source 22 based on the light source luminance control signal.
- the light source luminance control signal is, for example, a PWM (Pulse Width Modulation) signal.
- the video luminance detection unit 31 of the luminance control unit 30 acquires information such as an average luminance level (APL; Average ⁇ ⁇ Picture ⁇ Level) and a luminance frequency distribution from the video signal, and represents the luminance of the video every time (luminance information). Is calculated.
- the video signal is a video signal having luminance components (Y component and L component) such as YUV, YCbCr, YPbPr, L * u * v *, and L * a * b *.
- a signal having no luminance component such as RGB
- the video luminance storage unit 32 of the luminance control unit 30 is a memory that can accumulate a history of luminance information for a fixed period (several seconds to several tens of seconds).
- a FIFO First In First Out having a structure in which the oldest value is erased when a new value is written is applied.
- the predetermined period is derived from the adaptation time of the eye that can perceive a change in luminance.
- the calculation unit 33 of the luminance control unit 30 has a calculation capability capable of realizing an algorithm described in detail later.
- the outline of the processing is the range in which the luminance information detected by the video luminance detection unit 31 and the history of luminance information stored in the video luminance storage unit 32 are analyzed for video luminance variability and the light source luminance is difficult to perceive.
- FIG. 3 is a block diagram illustrating a configuration of the calculation unit 33.
- the calculation unit 33 includes a fluctuation detection unit 34 and a light source luminance determination unit 35.
- the fluctuation detection unit 34 detects video luminance variability based on the current video luminance information detected by the video luminance detection unit 31 and the history of video luminance information stored in the video luminance storage unit 32. Output as fluctuation information.
- the light source luminance determining unit 35 determines the light source luminance based on the luminance information of the current video detected by the video luminance detecting unit 31 and the fluctuation information output by the fluctuation detecting unit 34, and outputs it as a light source information control signal. .
- the fluctuation detection unit 34 detects the “variability” of the video luminance such as how the current video luminance changes from the history of video luminance information stored in the video luminance storage unit 32, Is output as fluctuation information. That is, the variation information is information indicating whether the variability is low, medium, or high.
- variable means the intensity of change in brightness and the ease of change, and includes the concept of the rate of change in brightness and the frequency of change in brightness. Therefore, “low variability” means that the change in video luminance is poor and the frequency of fluctuation is low. “High variability” means that the change in video luminance is abrupt and that the frequency of fluctuation is high. And, “medium variability” means the middle.
- a variation accumulated value is used as an index indicating variability based on the current video luminance level (detected by APL or luminance frequency distribution) and the past video luminance level history.
- FIG. 4 is an explanatory diagram of this variability derivation method.
- ⁇ Define the time based on the number of frames and use this as the horizontal axis.
- the vertical axis is the video brightness.
- the current time detected by the video brightness detection unit 31 is the Nth frame, and the video brightness information for the M frames before that is stored in the video brightness storage unit 32 in the order detected by the video brightness detection unit 31. Stored as history.
- a frame that is i frames before the Nth frame is defined as an Nith frame, and the video luminance of the frame is L [i].
- the fluctuation accumulated value of M frames before the Nth frame is obtained.
- a cumulative value of luminance lower than the luminance L [0] of the Nth frame is obtained. This is a negative difference sum, to be added if there is a change in the direction of brightness is increased occurs, if the increment accumulation value V i, the following equation.
- the fluctuation detecting unit 34 determines the variability, an example of which will be described below.
- the fluctuation reference unit is obtained in advance.
- the fluctuation reference unit can be obtained by the following formula. For example, if the frame rate is 30 FPS, the accumulation time is 10 seconds, and the number of gradations is 256 gradations, the variation reference unit is 76800.
- low variability means that the fluctuation accumulation value V is less than about 1 to 3% of the reference unit. In this case, for example, 76800 (variation reference unit) ⁇ 2% ⁇ 1500. Accordingly, assuming that the threshold value V1 for determining that “variability is low” is 1500, it is determined that “variability is low” when the accumulated cumulative value V is less than the threshold value V1.
- FIG. 5A shows fluctuations in video luminance when “variability is small”.
- “large variability” means that the accumulated fluctuation value V is about 10 to 15% or more of the reference unit. In this case, for example, 76800 (variation reference unit) ⁇ 13% ⁇ 10000. Accordingly, if the threshold value V2 for determining that “variability is large” is 10000, it is determined that “variability is large” when the accumulated variation value V is equal to or greater than the threshold value V2.
- FIG. 5B shows a change in video luminance when “variability is large”.
- FIG. 5C shows the fluctuation of the image brightness when “variability is medium”.
- the variability is obtained from the video luminance history, but the present invention is not limited to this.
- (1) dispersion of video luminance history values, (2) standard deviation of video luminance history values, (3) change rate by taking differentiation (difference) of video luminance history values, (4) Variability may be determined by obtaining a frequency component obtained by converting a history value of video luminance into a frequency domain representation by a method such as DFT or DCT.
- the light source luminance determination unit 35 determines a reduction amount of the light source luminance based on the variation information output by the variation detection unit 34, and outputs a light source luminance control signal.
- Table 1 shows the relationship between the variability of the image brightness and the reduction amount of the light source brightness. This is based on the aforementioned research by De Lange.
- the magnification ⁇ of the light source luminance is a number of 1 or less.
- FIG. 6 is a diagram illustrating an example of a function for determining the light source luminance magnification ⁇ from the current video luminance L and the fluctuation accumulation value V.
- this function if the video brightness L is constant, there is a relationship that the magnification ⁇ of the light source brightness decreases as the variability V increases from the middle level. Further, when the variability V is constant, there is a relationship that the magnification ⁇ of the light source luminance decreases as the video luminance L increases.
- the light source luminance magnification ⁇ may be obtained from a matrix (lookup table) of the current video luminance L and the fluctuation accumulated value V.
- control is performed by dividing the variability and the video brightness into three stages, but the control is not limited to this, and the control may be performed by further subdividing the variability and the video brightness.
- the light source luminance magnification ⁇ is not limited to the values shown in FIG.
- FIG. 7 is a flowchart illustrating a control processing procedure of the luminance control unit 30 according to the first embodiment.
- the video luminance detection unit 31 detects the video luminance from the input video signal, and outputs luminance information to the fluctuation detection unit 34, the light source luminance determination unit 35, and the video luminance storage unit 32 of the calculation unit 33 (step S1).
- the video brightness storage unit 32 stores brightness information and holds brightness information for a certain period as a video brightness history.
- the fluctuation detection unit 34 of the calculation unit 33 acquires the video brightness history of a predetermined period stored in the video brightness storage unit 32 (step S2).
- the fluctuation detection unit 34 of the calculation unit 33 detects variability based on the luminance information output from the video luminance detection unit 31 and the video luminance history before a certain period stored in the video luminance storage unit 32 (Ste S3).
- the method for deriving variability is as described above.
- the light source luminance determination unit 35 of the calculation unit 33 uses the fluctuation information (variability) output from the fluctuation detection unit 34 and the current video luminance information (video luminance) detected by the video luminance detection unit 31 to calculate the light source luminance. Reduce (step S4).
- the reduction condition and the reduction amount based on the variability and the current video luminance are as described above.
- the light source luminance determination unit 35 determines the light source luminance and outputs a light source luminance control signal to the light source control unit 23 of the display unit 20 (step S5).
- FIG. 8 is a diagram comparing the light source luminance control of the display device of the first embodiment and the light source luminance control of the conventional display device.
- a conventional display device does not have the luminance control unit 30 and does not perform light source luminance control.
- the video brightness has high variability between times t1 and t2 (violently fluctuates and the frequency is high), and low variability between times t3 and t4 (less fluctuates and the frequency is low). Low), the variability is moderate between times t0-t1 and t2-t3.
- the display device 10 controls the light source luminance according to, for example, the look-up table in Table 2 according to the video luminance variability. Therefore, since the variability is moderate between the times t0 to t1 and t2 to t3, the light source luminance is reduced within a range where it cannot be perceived when the video luminance is high.
- the variability is high between the times t1 and t2, it is difficult to perceive regardless of the video luminance, so the light source luminance is reduced within a range where it cannot be perceived. Since the variability is low between times t3 and t4, the light source luminance is gradually reduced when the video luminance is high or medium.
- the light source luminance is reduced based on the variability of the video luminance, and the opportunity for reducing the light source luminance is increased as compared with the conventional technology. Therefore, the power consumption is greatly reduced as compared with the conventional technology. There is an effect that can be done.
- FIG. 9 is a block diagram illustrating a display device according to the second embodiment.
- the display device 40 includes a display unit 20 and a luminance control unit 50.
- the display unit 20 includes a display panel 21, a light source 22, and a light source control unit 23 as in the first embodiment.
- the luminance control unit 50 includes a coefficient determination unit 51 and an image processing unit 52 in addition to the video luminance detection unit 31, the video luminance storage unit 32, and the calculation unit 33 of the first embodiment.
- the luminance of the light source is lowered and image processing for compensating for the reduction of the light source luminance is added to the video signal so that the change in luminance is less noticeable. That is, by performing image processing for increasing the video brightness on the video whose light source brightness is to be reduced, the images are canceled out to make it difficult to perceive the brightness reduction. Therefore, the light source luminance can be further reduced.
- the coefficient determination unit 51 calculates a coefficient of image processing that compensates for a decrease in light source luminance from the video luminance (current value).
- the image processing coefficient is ⁇
- the original light source luminance is L normal
- the reduced light source luminance is L reduce
- the gamma value of the liquid crystal panel is ⁇
- the image processing unit 52 Based on the image processing coefficient ⁇ determined by the coefficient determining unit 51, the image processing unit 52 performs image processing for compensating for the decrease in light source luminance, and outputs a compensated video signal.
- the video signal input to the image processing unit 52 is Y in and the compensated video signal output from the image processing unit 52 is Y out , the following equation is established.
- Y out ⁇ Y in
- the image processing coefficient ⁇ is a number of 1 or more.
- FIG. 10 is a flowchart illustrating a control processing procedure of the luminance control unit 50 according to the second embodiment.
- the processing from steps S11 to S15 is the same as steps S1 to S5 in FIG.
- the coefficient determination unit 51 determines the image processing coefficient ⁇ as described above based on the luminance information output from the video luminance detection unit 31 (step S16).
- the image processing unit 52 performs compensation processing on the video signal according to the determined image processing coefficient ⁇ , and outputs it to the display panel 21 of the display unit 20 (step S17).
- FIG. 11 is a diagram comparing light source luminance control (without light source control) of a conventional display device, light source luminance control of a display device that performs conventional luminance compensation, and light source luminance control of the display device of the second embodiment.
- a display device that performs conventional brightness compensation is a display device that does not have the video brightness storage unit 32 in the second embodiment, and the calculation unit does not perform light source brightness control according to variability.
- the video luminance has high variability between times t1 and t2 (violently fluctuates and the frequency is high), and low variability between times t3 and t4 (there is little fluctuation and the frequency is low). ), The variability is moderate between times t0-t1 and t2-t3.
- the light source luminance of a conventional display device (without luminance control) is a dotted line
- the light source luminance of a conventional display device for image luminance compensation image processing is a dashed line
- the light source luminance of the display device of the second embodiment is a solid line. It is represented by The light source luminance of a display device that only performs image luminance compensation image processing controls the light source luminance in proportion to the video luminance. In the second embodiment, however, image processing for compensating for light source luminance reduction is performed. Therefore, even if it is further reduced, it is difficult to perceive. Accordingly, it is possible to further reduce power consumption.
- FIG. 12 is a block diagram illustrating a display device according to the third embodiment.
- the display device 60 includes a display unit 20 and a luminance control unit 70.
- the display unit 20 includes a display panel 21, a light source 22, and a light source control unit 23 as in the first embodiment.
- the luminance control unit 70 includes a synchronization processing unit 71 in addition to the video luminance detection unit 31, the video luminance storage unit 32, and the calculation unit 33 of the first embodiment.
- the luminance control of the light source includes a slight delay with respect to video input. Therefore, in this embodiment, as shown in FIG. 13B, in order to reduce the influence, a synchronization processing unit (frame buffer) 71 for adjusting the output timing with the light source luminance by delaying the video signal is added. This is the configuration.
- FIG. 14 is a flowchart illustrating a control processing procedure of the luminance control unit 70 according to the third embodiment.
- the processing from step S21 to S25 is the same as that from step S1 to S5 in FIG.
- the synchronization processing unit 71 delays the video signal so as to be synchronized with the light source luminance control signal in step S25 (step S26).
- the synchronization processing unit 71 is added to the luminance control unit 30 of the first embodiment, but even if the synchronization processing unit 71 is added to the luminance control unit 50 of the second embodiment. I do not care.
- the synchronization processing unit 71 is disposed after the image processing unit 52, and the synchronization processing is performed on the video that has been subjected to the video luminance signal compensation processing.
- the display device of the fourth embodiment is the same as the configuration of FIG. 2, but the light source luminance control method of the calculation unit 33 is different.
- the fluctuation detecting unit 34 calculates the directionality of the video luminance change in addition to the video luminance variability
- the light source luminance determining unit 35 uses the light source luminance control.
- a difference value D between an older value (for example, the oldest history value) in the luminance history and a new value (for example, the current value) in the luminance history is calculated, and directionality is determined.
- FIG. 15 is a diagram illustrating the directionality of the change in video luminance depending on the oldest history value and the current value.
- FIG. 15A shows that the direction of change in the past luminance history tends to increase toward the current frame
- FIG. 15B shows the direction of change in the past luminance history toward the current frame. Indicates a downward trend.
- Difference value D current value ⁇ oldest history value, as shown in FIG. 15 (a)
- Difference value D current value ⁇ oldest history value, as shown in FIG. 15 (a)
- the difference value is positive, it tends to increase
- the difference value D is negative
- FIG. 15 (b) It is a trend.
- the direction of change is calculated very easily, but in the case of more strict determination, it is performed as follows.
- the determination condition for the image brightness as shown in FIG. 15A is that the incremental cumulative value V i >>> the decrement cumulative value V d , and the luminance value L [0] >> luminance value L [M ]. That is, the increment cumulative value (total negative difference) V i is much larger than the decrement cumulative value (positive difference total) Vd, and the luminance value L [M] of the NMth frame is the luminance of the current Nth frame. It is much lower than the value L [0].
- the incremental cumulative value Vi ⁇ decrease cumulative value Vd and the luminance value L [0] ⁇ luminance value L [M]. is there. That is, the increment cumulative value (total negative difference) V i is extremely smaller than the decrement cumulative value (positive difference total) Vd, and the luminance value L [M] of the NMth frame is the luminance of the current Nth frame. It is much higher than the value L [0].
- the direction of change determines “upward trend” and “downward trend” according to the above conditions. In all other cases, “no directionality” is assumed.
- the light source luminance determination unit 35 performs light source luminance control as follows based on the directionality of the video luminance fluctuation. According to the Weber-Fefner rule described above, the change in luminance is less noticeable when the original image luminance is higher. Therefore, in the case of a downward trend, since the luminance value L [M] of the NM frame is high, the luminance change is not conspicuous, and the amount of reduction is increased compared to the cases of the first and second embodiments. On the other hand, in the case of an upward trend, the luminance value L [M] of the NM frame is low, so that the luminance change is conspicuous and the reduction amount is suppressed.
- An example of the light source luminance control is shown in Table 3.
- FIG. 16 is a flowchart illustrating a control processing procedure of the luminance control unit 30 in the fourth embodiment.
- the video luminance detection unit 31 detects the video luminance from the input video signal and outputs luminance information to the fluctuation detection unit 34 and the light source luminance determination unit 35 of the calculation unit 33 and the video luminance storage unit 32 (step S31).
- the video brightness storage unit 32 stores brightness information and holds brightness information for a certain period as a video brightness history.
- the fluctuation detection unit 34 of the calculation unit 33 acquires the video luminance history of a predetermined period stored in the video luminance storage unit 32 (step S32).
- the variation detection unit 34 of the calculation unit 33 variability and variation directionality based on the luminance information output from the video luminance detection unit 31 and the video luminance history before a certain period stored in the video luminance storage unit 32. Is detected (step S33).
- the derivation method for variability is as described in the first embodiment, and the derivation method for variability is as described above.
- the light source luminance determination unit 35 of the calculation unit 33 uses the fluctuation information (variability) output from the fluctuation detection unit 34 and the current video luminance information (video luminance) detected by the video luminance detection unit 31 to calculate the light source luminance. To reduce. Further, as described in Table 3, the light source luminance is further reduced based on the variability and the directionality (step S34).
- the light source luminance determination unit 35 determines the light source luminance and outputs a light source luminance control signal to the light source control unit 23 of the display unit 20 (step S35).
- the power consumption can be reduced by further reducing the light source luminance based on the changing directionality.
- FIG. 17 is a diagram for explaining the control of the light source luminance by the transition of the change direction of the video luminance.
- the light source luminance determining unit 35 changes the control according to the change in directionality. That is, in the case of a transition of “upward trend ⁇ no direction ⁇ downward trend” (81 in FIG. 17), it can be estimated that the peak is a high-intensity peak (the mountain portion in FIG. 17), so the reduction amount is refrained in order to ensure contrast 83 of FIG.
- FIG. 18 is a flowchart illustrating a control processing procedure of the luminance control unit 30 according to the fifth embodiment.
- the video luminance detection unit 31 detects the video luminance from the input video signal and outputs luminance information to the fluctuation detection unit 34 and the light source luminance determination unit 35 of the calculation unit 33 and the video luminance storage unit 32 (step S41).
- the video brightness storage unit 32 stores brightness information and holds brightness information for a certain period as a video brightness history.
- the fluctuation detection unit 34 of the calculation unit 33 acquires the video luminance history before a certain period stored in the video luminance storage unit 32 (step S42).
- the variation detection unit 34 of the calculation unit 33 variability and variation directionality based on the luminance information output from the video luminance detection unit 31 and the video luminance history before a certain period stored in the video luminance storage unit 32. Is detected (step S43).
- the method for deriving the variability is as described in the first embodiment, and the method for deriving the transition of the variation direction is as described above.
- the light source luminance determination unit 35 of the calculation unit 33 uses the fluctuation information (variability) output from the fluctuation detection unit 34 and the current video luminance information (video luminance) detected by the video luminance detection unit 31 to calculate the light source luminance. To reduce. Further, the light source luminance is adjusted to ensure the contrast based on the transition of the variability and the variation directionality (step S44).
- the light source luminance determining unit 35 determines the light source luminance and outputs a light source luminance control signal to the light source control unit 23 of the display unit 20 (step S45).
- the light source luminance is adjusted based on the transition of the variation directionality, it is possible to provide a high-quality image that is easy to view while ensuring contrast.
- each unit of the luminance control unit 30 may be configured by a processor, a logic circuit, or the like and processed in hardware, or the processor may execute processing of each unit by reading a program.
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Description
(1)ウェーバー・フェフナーの法則
人間が知覚できる刺激の最小の変化量ΔSは元の刺激の大きさSに比例する。従って、全体の輝度が高いほど微小な輝度低下は知覚されにくい。
ΔS=kS
図1には、輝度変化を知覚する感度と輝度変化の周波数の関係を示す。輝度変化を知覚する感度とは、人間が知覚できる輝度変化の最小量を示す。図1(a)は、表示平均輝度が低い場合を示し、輝度の高周波(極めて急速な)の変動は知覚されにくい(知覚されにくい範囲5)。図1(b)は、表示平均輝度が高い場合を示し、表示平均輝度が高い場合、高周波数(極めて急速な)の変動と低周波数(極めてゆるやかな)変動は知覚されにくい(知覚されにくい範囲5)。
図2は、第1の実施形態における表示装置を示すブロック図である。
表示装置10は、表示部20と、輝度制御部30とを備える。表示部20は、表示パネル21、光源22、光源制御部23から構成される。輝度制御部30は、映像輝度検出部31、映像輝度記憶部32、演算部33から構成される。
演算部33は、変動検出部34と、光源輝度決定部35とから構成される。変動検出部34は、映像輝度検出部31が検出した現在の映像の輝度情報と、映像輝度記憶部32が記憶している映像の輝度情報の履歴に基づいて映像輝度の変動性検出を行い、変動情報として出力する。光源輝度決定部35は、映像輝度検出部31が検出した現在の映像の輝度情報と、変動検出部34が出力した変動情報とに基づいて、光源輝度を決定し、光源情報制御信号として出力する。
変動検出部34は、映像輝度記憶部32が記憶している映像の輝度情報の履歴から現在の映像輝度がどうのように変動しているか、という映像輝度の「変動性」を検出し、それを変動情報として出力する。すなわち、変動情報とは、変動性が低いのか、中程度なのか、高いのかを示す情報である。
まず、第Nフレームの輝度L[0]よりも低い輝度の累積値を求める。これは負の差分合計であり、輝度が増加する方向の変動が生じた場合に加算されるため、増分累積値Viとすると、以下の式となる。
変動基準単位=フレームレート×蓄積時間×階調数
例えば、フレームレートが30FPS、蓄積時間が10秒、階調数が256階調の場合、変動基準単位は76800となる。
また、高輝度は、例えば、輝度値の表現可能範囲の60%程度以上とする。従って、8bit=256階調の場合、256×0.6≒150となり、閾値L2=150以上の場合、高輝度とする。
光源輝度の倍率αを、現在の映像輝度Lと、変動累積値Vの関数として定義すると、
α=f(L,V)
となる。ここで、光源輝度の倍率αは1以下の数字である。
映像輝度検出部31は入力映像信号から映像輝度を検出して輝度情報を、演算部33の変動検出部34及び光源輝度決定部35と、映像輝度記憶部32とに出力する(ステップS1)。映像輝度記憶部32は、輝度情報を格納し、一定期間分の輝度情報を映像輝度履歴として保持する。演算部33の変動検出部34は、映像輝度記憶部32に記憶されている一定期間前の映像輝度履歴を取得する(ステップS2)。演算部33の変動検出部34は、映像輝度検出部31から出力された輝度情報と、映像輝度記憶部32に記憶されている一定期間前の映像輝度履歴とに基づいて変動性を検出する(ステップS3)。変動性の導出方法は、上述した通りである。演算部33の光源輝度決定部35は、変動検出部34から出力された変動情報(変動性)と、映像輝度検出部31が検出した現映像輝度情報(映像輝度)を用いて、光源輝度を低減する(ステップS4)。ここで、変動性と現映像輝度に基づく低減条件と低減量は、上述の通りである。光源輝度決定部35は、光源輝度を決定して、光源輝度制御信号を表示部20の光源制御部23に出力する(ステップS5)。
図9は、第2の実施形態における表示装置を示すブロック図である。
表示装置40は、表示部20と、輝度制御部50とを備える。表示部20は、第1の実施形態と同様に表示パネル21、光源22、光源制御部23から構成される。輝度制御部50は、第1の実施形態の映像輝度検出部31、映像輝度記憶部32、演算部33に加えて、係数決定部51と、画像処理部52とから構成される。
Yout=βYin
なお、画像処理係数βは1以上の数字である。
ステップS11~S15までの処理は、図7のステップS1~S5と同じなので説明は省略する。係数決定部51は、映像輝度検出部31から出力された輝度情報に基づいて、上述のように画像処理係数βを決定する(ステップS16)。画像処理部52は、決定された画像処理係数βに従って映像信号に補償処理を行ない、表示部20の表示パネル21に出力する(ステップS17)。
図12は、第3の実施形態における表示装置を示すブロック図である。
表示装置60は、表示部20と、輝度制御部70とを備える。表示部20は、第1の実施形態と同様に表示パネル21、光源22、光源制御部23から構成される。輝度制御部70は、第1の実施形態の映像輝度検出部31、映像輝度記憶部32、演算部33に加えて、同期処理部71から構成される。
ステップS21~S25までの処理は、図7のステップS1~S5と同じなので説明は省略する。同期処理部71は、ステップS25における光源輝度制御信号に同期するように映像信号を遅延させる(ステップS26)。
第4の実施形態の表示装置は、図2の構成と同じであるが、演算部33の光源輝度制御の方法が異なる。第4の実施形態においては、変動検出部34が、映像輝度の変動性に加え映像輝度の変化の方向性を算出し、光源輝度決定部35が光源輝度制御に利用する。輝度履歴の中で古い方の値(例えば最も古い履歴値)と輝度履歴の中で新しい方の値(例えば現在の値)との差分値Dを算出し、方向性を判断する。
差分値D=現在値-最も古い履歴値
として、図15(a)のように、差分値が正であれば上昇傾向、図15(b)のように、差分値Dが負であれば下降傾向である。これは極めて簡単に変動方向を算出しているが、より厳密に判定する場合は、次のように行う。
前述したウェーバー・フェフナー則によれば、元の映像輝度が高い方が輝度の変化は目立ちにくい。そこで、下降傾向の場合は、N-Mフレームの輝度値L[M]が高いので、輝度変化が目立ちにくく、第1及び第2の実施形態の場合より削減量を増やす。一方、上昇傾向の場合は、N-Mフレームの輝度値L[M]が低いので、輝度変化が目立ちやすく、削減量を抑える。この光源輝度制御の一例を表3に示す。
映像輝度検出部31は入力映像信号から映像輝度を検出して輝度情報を、演算部33の変動検出部34及び光源輝度決定部35と、映像輝度記憶部32とに出力する(ステップS31)。映像輝度記憶部32は、輝度情報を格納し、一定期間分の輝度情報を映像輝度履歴として保持する。演算部33の変動検出部34は、映像輝度記憶部32に記憶されている一定期間前の映像輝度履歴を取得する(ステップS32)。演算部33の変動検出部34は、映像輝度検出部31から出力された輝度情報と、映像輝度記憶部32に記憶されている一定期間前の映像輝度履歴とに基づいて変動性と変動方向性を検出する(ステップS33)。変動性の導出方法は、第1の実施形態に記載した通りであり、変動方向性の導出方法は上述した通りである。演算部33の光源輝度決定部35は、変動検出部34から出力された変動情報(変動性)と、映像輝度検出部31が検出した現映像輝度情報(映像輝度)を用いて、光源輝度を低減する。さらに、表3に記載したように変動性と変動方向性に基づいてさらに光源輝度を低減する(ステップS34)。光源輝度決定部35は、光源輝度を決定して、光源輝度制御信号を表示部20の光源制御部23に出力する(ステップS35)。
また、光源輝度決定部35の上記輝度変動の方向性に基づく輝度制御として別の例として第5の実施形態を説明する。
図17は、映像輝度の変動方向性の推移による光源輝度の制御を説明する図である。
光源輝度決定部35は、方向性の推移により制御を変更する。すなわち、「上昇傾向→方向なし→下降傾向」と推移する場合(図17の81)は、高輝度のピーク(図17の山の部分)と推定できるので、コントラスト確保のため削減量を控える(図17の83)。一方、「下降傾向→方向なし→上昇傾向」と推移する場合は(図17の82)、低輝度のピーク(図17の谷の部分)と推定できるので、コントラスト確保のため削減量を増やす(図17の84)。
映像輝度検出部31は入力映像信号から映像輝度を検出して輝度情報を、演算部33の変動検出部34及び光源輝度決定部35と、映像輝度記憶部32に出力する(ステップS41)。映像輝度記憶部32は、輝度情報を格納し、一定期間分の輝度情報を映像輝度履歴として保持する。演算部33の変動検出部34は、映像輝度記憶部32に記憶されている一定期間前の映像輝度履歴を取得する(ステップS42)。演算部33の変動検出部34は、映像輝度検出部31から出力された輝度情報と、映像輝度記憶部32に記憶されている一定期間前の映像輝度履歴とに基づいて変動性と変動方向性の推移を検出する(ステップS43)。変動性の導出方法は、第1の実施形態に記載した通りであり、変動方向性の推移の導出方法は上述した通りである。演算部33の光源輝度決定部35は、変動検出部34から出力された変動情報(変動性)と、映像輝度検出部31が検出した現映像輝度情報(映像輝度)を用いて、光源輝度を低減する。さらに、変動性と変動方向性の推移に基づいて光源輝度をコントラスト確保のため調整する(ステップS44)。光源輝度決定部35は、光源輝度を決定して、光源輝度制御信号を表示部20の光源制御部23に出力する(ステップS45)。
20 表示部
21 表示パネル
22 光源
23 光源制御部
30 輝度制御部
31 映像輝度検出部
32 映像輝度記憶部
33 演算部
34 変動検出部
35 光源輝度決定部
40 表示装置
50 輝度制御部
51 係数決定部
52 画像処理部
60 表示装置
70 輝度制御部
71 同期処理部
Claims (11)
- 表示パネルのバックライトである光源の輝度を制御する輝度制御装置であって、
入力された映像信号の輝度を検出する映像輝度検出部と、
前記映像輝度検出部にて検出された映像輝度を一定期間分だけ記憶する映像輝度記憶部と、
前記映像輝度と、前記映像輝度記憶部に記憶された前記映像輝度の履歴とを用いて前記映像輝度の変動の激しさを示す変動性を検出し、前記映像輝度と前記変動性とから定めた前記光源の輝度を定める光源輝度制御信号を出力する演算部と、
を備えることを特徴とする輝度制御装置。 - 前記演算部は、前記変動性が予め設定した第1の所定値より高い場合、前記映像輝度にかかわらず光源輝度を低減することを特徴とする請求項1に記載の輝度制御装置。
- 前記演算部は、前記変動性が予め設定した第2の所定値より低い場合で、且つ前記映像輝度が第1の閾値より高い場合には、光源輝度を低減することを特徴とする請求項1に記載の輝度制御装置。
- 光源輝度を低減する映像に対し光源輝度低下を補償するよう映像輝度を増加させた補償映像信号を得る画像処理部を備え、
前記演算部は、前記補償映像信号の輝度に応じて光源輝度をさらに低減させることを特徴とする請求項1から3のいずれかに記載の輝度制御装置。 - 光源輝度の制御処理による遅延に応じて入力映像信号を遅延して光源輝度制御信号と同期させる同期処理部を備えたことを特徴とする請求項1から4のいずれかに記載の輝度制御装置。
- 前記演算部は、前記映像輝度の変動の方向性を算出し、変動の方向性が下降傾向の場合は、光源輝度の低減量を増やし、変動の方向性が上昇傾向の場合は、光源輝度の低減量を控えることを特徴とする請求項1から5のいずれかに記載の輝度制御装置。
- 前記演算部は、前記映像輝度の変化の方向性を算出し、変化の方向性の推移が、上昇傾向から下降傾向と順に推移した場合、光源輝度の低減量を増加させることを特徴とする請求項1から6のいずれかに記載の輝度制御装置。
- 前記演算部は、前記映像輝度の変化の方向性を算出し、変化の方向性が、下降傾向から方向性なし、上昇傾向と順に推移した場合、光源輝度の低減量を控えることを特徴とする請求項1から6のいずれかに記載の輝度制御装置。
- 請求項1から8のいずれかに記載の輝度制御装置と、
表示パネルと、該表示パネルの近傍に配置された光源と、該光源を前記輝度制御装置からの光源輝度制御信号に応じて制御する光源制御部とを備えた表示部と、
を備える表示装置。 - 表示パネルのバックライトである光源の輝度を制御する輝度制御方法であって、
入力された映像信号の輝度を検出する映像輝度検出ステップと、
前記映像輝度検出ステップにて検出された映像輝度を一定期間分だけ記憶する映像輝度記憶ステップと、
前記映像輝度と、前記映像輝度記憶ステップにて記憶された前記映像輝度の履歴とを用いて前記映像輝度の変動の激しさを示す変動性を検出し、前記映像輝度と前記変動性とから定めた前記光源の輝度を定める光源輝度制御信号を出力する演算ステップと、
を備えることを特徴とする輝度制御方法。 - 請求項10の輝度制御方法を制御装置に実行させる輝度制御プログラム。
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- 2010-05-21 US US13/321,791 patent/US8912998B2/en not_active Expired - Fee Related
- 2010-05-21 CN CN201080022253.9A patent/CN102439653B/zh not_active Expired - Fee Related
- 2010-05-21 BR BRPI1012158A patent/BRPI1012158A2/pt not_active IP Right Cessation
- 2010-05-21 JP JP2011514461A patent/JP5367815B2/ja not_active Expired - Fee Related
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KR20120133431A (ko) * | 2011-05-31 | 2012-12-11 | 삼성디스플레이 주식회사 | 유기전계발광 표시장치 및 그의 구동방법 |
KR101856089B1 (ko) * | 2011-05-31 | 2018-06-21 | 삼성디스플레이 주식회사 | 유기전계발광 표시장치 및 그의 구동방법 |
CN103050097A (zh) * | 2013-01-21 | 2013-04-17 | 北京小米科技有限责任公司 | 调节背光灯亮度的方法及装置 |
JP2015049487A (ja) * | 2013-09-04 | 2015-03-16 | キヤノン株式会社 | 画像処理装置及びその制御方法 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2010134600A1 (ja) | 2012-11-12 |
JP5367815B2 (ja) | 2013-12-11 |
CN102439653B (zh) | 2014-04-02 |
US8912998B2 (en) | 2014-12-16 |
US20120062622A1 (en) | 2012-03-15 |
BRPI1012158A2 (pt) | 2016-04-05 |
CN102439653A (zh) | 2012-05-02 |
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