CN110956933B - Power consumption adjusting method and device for display equipment - Google Patents
Power consumption adjusting method and device for display equipment Download PDFInfo
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- CN110956933B CN110956933B CN201811130989.2A CN201811130989A CN110956933B CN 110956933 B CN110956933 B CN 110956933B CN 201811130989 A CN201811130989 A CN 201811130989A CN 110956933 B CN110956933 B CN 110956933B
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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
- 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
- G09G3/36—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 using liquid crystals
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
Abstract
The invention discloses a method and a device for adjusting power consumption of display equipment, wherein the method comprises the following steps: reading a histogram of a current frame to-be-displayed picture, and calculating a characteristic value of the histogram of the to-be-displayed picture; acquiring an original backlight value, and calculating an expected backlight and an expected image enhancement lookup table according to the original backlight value and the histogram feature value; adjusting an output backlight of the display device in accordance with a desired backlight; adjusting the brightness of the image to be displayed according to the expected image enhancement look-up table; calculating a current algorithm power consumption model according to the expected backlight and the expected image enhancement lookup table; and analyzing the algorithm power consumption model so as to adjust the working frequency required by the display equipment for displaying the picture according to the analysis result. Therefore, the aim of saving power consumption is achieved while the bright and easy-to-see display effect is provided for a user, namely the aim of dynamically adjusting the display picture in real time and limiting the power consumption overhead is achieved.
Description
Technical Field
The invention relates to the field of power consumption adjustment, in particular to a method and a device for adjusting power consumption of display equipment.
Background
In the process of displaying the picture, the liquid crystal display device comprises a plurality of scenes for displaying the picture, wherein the backlight module is used for providing illumination for the display, and generally, the brighter the backlight, the brighter the display picture, but the higher the power consumption, the darker the backlight, the darker the display picture, but the lower the power consumption. Or, in order to enhance the image quality, the image quality of the display screen is adjusted, but in this process, additional power consumption is added. Moreover, both the backlight adjustment process and the image quality adjustment process include an arithmetic operation process, which also generates additional power consumption.
As the image quality of the display screen is more and more required, higher power consumption may be generated, however, adjustment of the power consumption is also a concern for users. In the prior art, the scenes are not comprehensively considered, and the display picture cannot be dynamically adjusted in real time and the power consumption overhead is limited.
Disclosure of Invention
In view of this, the embodiment of the invention discloses a method and a device for adjusting power consumption of a display device, which achieve the purposes of dynamically adjusting a display picture in real time and limiting power consumption overhead.
The embodiment of the invention discloses a method for adjusting power consumption of display equipment, which comprises the following steps:
reading a histogram of a current frame to-be-displayed picture, and calculating a characteristic value of the histogram of the to-be-displayed picture;
acquiring an original backlight value, and calculating an expected backlight and an expected image enhancement lookup table according to the original backlight value and the histogram feature value;
adjusting an output backlight of the display device in dependence on the desired backlight;
adjusting the brightness of the picture to be displayed according to the expected image enhancement lookup table;
calculating a current algorithm power consumption model according to the expected backlight and the expected image enhancement look-up table;
and adjusting the working frequency required by the display equipment for displaying the picture according to the algorithm power consumption and a preset working frequency lookup table.
Optionally, the calculating a feature value of a histogram of the to-be-displayed picture includes:
judging whether the current frame is a key frame;
if the current frame is a key frame, calculating a characteristic value of a histogram of the current frame to-be-displayed picture;
if the current frame is not a key frame, predicting a characteristic value of a histogram of a picture to be displayed of the current frame according to a plurality of key frames before the current frame;
carrying out amplitude limiting processing on the characteristic value of the histogram;
and performing low-pass filtering processing on the characteristic values of the histogram.
Optionally, the method further includes:
and smoothing the expected backlight.
Optionally, the method further includes:
smoothing the expected image enhancement look-up table to filter high frequency signals of the expected image enhancement look-up table;
fusing the desired image enhancement look-up table with other enhancement look-up tables.
Optionally, the method further includes:
calculating load power consumption of the display device;
and adjusting the working frequency required by the display equipment for displaying the picture according to the load power consumption.
The embodiment of the invention also discloses a power consumption adjusting device of the display equipment, which comprises:
the device comprises a calculation module, a backlight adjusting module, an image quality adjusting module and a performance adjusting module;
the calculation module is used for reading a histogram of a current frame to-be-displayed picture and calculating a characteristic value of the histogram; calculating an expected backlight and an expected image enhancement look-up table according to the original backlight value and the histogram feature value; sending the expected backlight to the backlight adjusting module, and sending the expected image enhancement lookup table to the image quality adjusting module; according to the expected backlight and the expected image, an algorithm power consumption model of a calculation module of a lookup table is enhanced; sending the algorithm power consumption model to the performance adjustment module;
the performance adjusting module is used for determining the working frequencies of the calculating module, the image quality adjusting module and the backlight adjusting module according to the algorithm power consumption and a preset working frequency lookup table, and sending performance adjusting signals to the calculating module, the image quality adjusting module and the backlight adjusting module;
the backlight adjusting module is used for adjusting the output backlight of the display equipment according to the expected backlight and adjusting the working frequency of the backlight adjusting module according to the performance adjusting signal sent by the performance adjusting module;
the image quality adjusting module is used for adjusting the brightness of the picture to be displayed according to the expected image enhancement look-up table and adjusting the working frequency of the image quality adjusting module according to the performance adjusting signal sent by the performance adjusting module.
Optionally, the calculation module includes:
the characteristic value operator module is used for calculating the characteristic value of the histogram in a mode of accumulating the histogram gray scale probability;
the amplitude limiting submodule is used for carrying out amplitude limiting processing on the characteristic value of the histogram;
and the first filtering submodule is used for carrying out filtering processing on the characteristic value of the histogram.
Optionally, the backlight adjusting module is further configured to:
and smoothing the expected backlight.
Optionally, the image quality adjusting module is further configured to:
smoothing the expected image enhancement look-up table to filter high frequency signals of the expected image enhancement look-up table;
fusing the desired image enhancement look-up table with other enhancement look-up tables.
Optionally, the performance adjusting module is further configured to:
calculating load power consumption of the display device;
and determining the working frequency of the calculation module, the image quality adjusting module and the backlight adjusting module according to the load power consumption.
The embodiment of the invention discloses a method and a device for adjusting power consumption of display equipment, wherein the method comprises the following steps: reading a histogram of a current frame to-be-displayed picture, and calculating a characteristic value of the histogram of the to-be-displayed picture; acquiring an original backlight value, and calculating an expected backlight and an expected image enhancement lookup table according to the original backlight value and the histogram feature value; adjusting an output backlight of the display device in accordance with a desired backlight; adjusting the brightness of the picture to be displayed according to the expected image enhancement lookup table; calculating a current algorithm power consumption model according to the expected backlight and the expected image enhancement lookup table; and analyzing the algorithm power consumption model so as to adjust the working frequency required by the display equipment for displaying the picture according to the analysis result. Therefore, the aim of saving power consumption is achieved while the bright and easy-to-see display effect is provided for a user, namely the aim of dynamically adjusting the display picture in real time and limiting the power consumption overhead is achieved.
Furthermore, a low-precision histogram mode is adopted, the characteristic value of the histogram of the key frame is calculated in a self-adaptive mode, the characteristic value of the histogram of the non-key frame is predicted, and the system power consumption is saved.
Furthermore, the output backlight is subjected to smoothing treatment, high-frequency disturbance of the backlight is filtered, and the phenomenon of screen flashing is prevented.
Furthermore, a method for limiting contrast image enhancement is adopted, the display effect is optimized, and image distortion is avoided to the greatest extent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flowchart illustrating a method for adjusting power consumption of a display device according to an embodiment of the present invention;
FIG. 2 shows a schematic diagram of a histogram;
FIG. 3 shows a schematic diagram of a clipped luminance histogram;
FIG. 4 shows a schematic diagram of a second monotonically decreasing function;
FIG. 5 shows a schematic diagram of a reconstructed luminance histogram;
fig. 6 shows a schematic diagram of a power consumption adjusting apparatus of a display device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic flow chart of a method for adjusting power consumption of a display device according to an embodiment of the present invention is shown, where the method includes:
s101: reading a histogram of a current frame to-be-displayed picture, and calculating a characteristic value of the histogram of the to-be-displayed picture;
in order to reduce power consumption generated by calculating the feature value, the embodiment of the present invention calculates the feature value of the histogram of the current frame to be displayed in a manner of adaptive key frame, specifically including:
judging whether the current frame is a key frame;
if the current frame is a key frame, calculating a characteristic value of a histogram of the current frame to-be-displayed picture;
if the current frame is not a key frame, predicting a characteristic value of a histogram of a picture to be displayed of the current frame according to a plurality of key frames before the current frame;
carrying out amplitude limiting processing on the characteristic value of the histogram;
and performing low-pass filtering processing on the characteristic values of the histogram.
In this embodiment, the image frame may be divided into a full load state and an interpolated frame state according to different frame rates, where the interpolated frame state may also be divided into a key frame and a current frame, and the specific S101 may include:
detecting the frame rate of a current frame, and judging whether the frame rate of the current frame is greater than a preset frame rate threshold value;
if the current frame rate is less than the preset frame rate threshold value, the current frame is in a full load state;
if the current frame rate is greater than the preset frame rate threshold value, the current frame is in an interpolation frame state, and whether the current frame is a prediction frame is judged according to a preset interpolation frame rule;
if the current frame meets a preset frame interpolation rule, the current frame is a predicted frame;
and if the current frame does not meet the preset frame interpolation rule, the current frame is a key frame.
In this embodiment, the frame rate may be detected by performing convolution on the historical frame timestamps, and calculating the frame rate of the current frame and the frame rate at a fixed time interval within a period of time before the current frame.
For example, the following steps are carried out: suppose that the current time is n and the display frequency is FnThe average display period is Tn, the width of the integration window is m, that is, m rendering periods of history are totally stored at the current time, specifically, the rendering period of history stored at n time is Tn，Tn-1，Tn-2，...，Tn-mWherein, tn，tn-1Are respectively asTime stamps of n time and n-1 time, and a frequency F is displayednAnd an average display period of TnCan be expressed as the following equation 1) and equation 2), respectively:
1)
2)Tn＝tn-tn-1。
in this embodiment, it should be noted that the preset frame rate threshold may be obtained through experiments by a skilled person.
Wherein the prediction process for the predicted frame comprises:
if the current frame is a prediction frame, performing least square curve fitting on the characteristic values of the histograms corresponding to a plurality of key frames before the current frame;
calculating a preliminary characteristic value of a histogram corresponding to the current frame according to the fitted curve analytic expression;
and performing Kalman filtering on the preliminary characteristic value of the histogram to obtain the characteristic value of the histogram.
For example, the following steps are carried out: for the frame interpolation state, assuming that the current frame is a predicted frame, performing least square curve fitting according to the characteristic values of the histograms of the images corresponding to two key frames before the predicted frame; then, according to the analytic expression of the obtained fitting curve, predicting a second characteristic value of the histogram corresponding to the predicted frame; and finally, performing Kalman filtering on the obtained second characteristic value to obtain a characteristic value of a histogram corresponding to the predicted frame, namely the characteristic value of the histogram corresponding to the current frame.
In this embodiment, the feature value of the histogram of the to-be-displayed picture of the key frame may be calculated in various ways, which is not limited in this embodiment.
For example, the present embodiment provides two preferred embodiments for calculating the feature value of the histogram of the to-be-displayed picture of the key frame:
the first implementation mode comprises the following steps:
as shown in fig. 2, the abscissa of the histogram is the gray scale value, the ordinate is the probability of the gray scale value of the pixel, and the accumulated value of the gray scale probability value of the pixel corresponding to the gray scale value is calculated from the position of the minimum gray scale to the direction of the maximum gray scale value;
judging whether the accumulated value corresponding to the current gray-scale value exceeds a preset first threshold value or not;
and when the accumulated value corresponding to the current gray-scale value exceeds a preset first threshold value, determining the current gray-scale value as a characteristic value of the histogram of the picture to be displayed.
For example, the following steps are carried out: for a histogram with 8-bit width precision, the histogram feature value s can be calculated by the following formula 3):
formula 3)
Wherein, S represents the current gray level value, h (t) represents the probability of the pixel gray level, and K represents the preset first threshold.
The selection rule for the first threshold K is as follows: k is a real number normalized to [0,1], wherein the higher the K value is, the higher the S value is, the larger the influence of the gray scale of a brighter area in the picture on the characteristic value S of the histogram is; conversely, the smaller the K value, the lower S, and the less the effect of the gray scale value representing a bright area in the screen on the histogram feature value S.
The second embodiment:
setting a plurality of different first threshold values, and calculating a plurality of histogram feature values based on the first embodiment;
and carrying out weighted average on the plurality of histogram characteristic values to obtain the characteristic value of the histogram of the current frame to-be-displayed picture.
In this embodiment, since the histogram feature value of each frame is calculated in the prior art, a problem that the histogram feature value may change frequently may occur, and in order to solve this problem, this embodiment also performs clipping on the histogram feature value. For example, a minimum threshold K of histogram feature values may be setminAnd a maximum threshold value KmaxThe histogram feature values are defined by a minimum threshold and a maximum threshold. If the histogram feature value is at the minimum threshold value KminAnd maximum thresholdValue KmaxDetermining the characteristic value of the histogram as the actually output characteristic value of the histogram; if the characteristic value of the histogram is smaller than the minimum threshold value, taking the minimum threshold value as the actually output characteristic value of the histogram; and if the characteristic value of the histogram is larger than the maximum threshold value, taking the maximum threshold value as the characteristic value of the actually output histogram. For example, the process of clipping can be expressed by the following formula 3:
equation 3) Sl＝min(Kmax，max(Kmin，S))；
In addition, as can be seen from the above description, the characteristic value of the histogram is a time-varying signal, and in order to eliminate the high-frequency interference of the event-varying signal, the characteristic value of the histogram of each frame may be low-pass filtered, for example, by the following formula 4):
equation 4) Sf＝ρ×Sprec+(1-ρ)×Scurr,ρ∈[0,1]；
Wherein S isfFor the filtered histogram feature values, SprecIs the output of the last filter, ScurrP is a filter coefficient, which is the characteristic value of the original histogram feature map to be filtered at this time.
It should be noted that, for the first embodiment and the second embodiment, the first embodiment may perform clipping first and then filtering, and the second embodiment may perform clipping first and then filtering.
S102: and acquiring an original backlight value, and calculating an expected backlight and an expected image enhancement lookup table according to the original backlight value and the histogram feature value.
In this embodiment, the desired backlight may be understood as an ideal backlight value in the current display state of the display device, where the ideal backlight value is to reduce the backlight to the maximum extent under the condition that the display brightness required by the picture to be displayed is met, so as to achieve the purpose of saving power consumption.
The desired backlight may be calculated in various ways, and is not limited in this embodiment.
In this embodiment, refer to equation 5 below), which is one implementation of calculating the desired backlight:
equation 5) ldst＝F(S,l)＝l×Sg；
Wherein, F is a backlight calculation model, l is a normalized input original backlight value, S is a normalized current frame histogram characteristic value, g is a preset model curvature, the larger g is, the higher the nonlinearity is, and the more gradual the output backlight change rate is when the picture brightness is higher.
In this embodiment, the desired image enhancement look-up table may be represented as an image enhancement look-up table that enables the display device to display the best image quality in the current backlight state.
The desired image enhancement look-up table may be calculated in various ways, and is not limited in this embodiment.
Preferably, an embodiment of calculating the desired image enhancement look-up table may be provided as follows:
acquiring a backlight value corresponding to the characteristic value of the current frame histogram according to a preset backlight lookup table, and acquiring an image enhancement coefficient corresponding to the backlight value according to a preset image gain coefficient;
and calculating a plurality of enhancement control points corresponding to the Bezier curve according to the image enhancement coefficient, and generating an expected image enhancement lookup table according to the enhancement control points.
S103: adjusting an output backlight of the display device in dependence on the desired backlight;
in the embodiment, the backlight is adjusted to the desired backlight, so that power consumption caused by high backlight loss can be saved.
Because the number of initiators of backlight adjustment of the display device is large, the conventional backlight adjustment device and method are prone to the problem of screen flicker, and in order to solve the problem, in this embodiment, the output backlight may be smoothed, and high-frequency disturbance of the backlight is filtered out.
For example, a first order inertial filter may be used to smooth the desired backlight to obtain the actual output backlight.
S104: adjusting the brightness of the picture to be displayed according to the expected image enhancement lookup table;
in this embodiment, the look-up table for the desired image enhancement may be performed by various methods, which are not limited in this embodiment.
To suppress noise and improve image contrast while saving power consumption, the image enhancement look-up table may be calculated as follows:
acquiring a brightness distribution histogram of a picture to be displayed;
cutting the brightness histogram by adopting a preset first monotonic decreasing function to obtain a first brightness histogram and a second brightness histogram;
generating a second monotonic decreasing function according to the second brightness histogram and a preset first parameter;
reconstructing according to the second monotone decreasing function and the first brightness histogram to obtain a reconstructed brightness histogram;
acquiring the expected image enhancement lookup table according to the reconstructed brightness histogram;
and adjusting the brightness of the picture to be displayed according to the expected image enhancement look-up table.
The generation method of the first monotone decreasing function comprises the following steps:
determining the lowest clipping boundary according to the area of the brightness distribution histogram of the picture to be displayed and a preset second parameter;
determining a highest clipping boundary according to the lowest clipping boundary of the first monotone decreasing function and a preset third parameter;
and generating the first monotone decreasing function according to a preset monotone decreasing function, the lowest clipping boundary and the highest clipping boundary.
For example, the following steps are carried out: the lowest clipping boundary and the highest clipping boundary may be calculated by the following equation 6):
6)
wherein k represents a second parameter, and the setting of the parameter can be preset by a technician or set according to actual conditionsG represents a third parameter, which may be preset by a technician or set according to actual conditions, CminRepresenting the lowest clipping boundary of a first monotonically decreasing function, CmaxRepresenting the highest clipping boundary of the second monotonically decreasing function.
If the first monotonically decreasing function is a linear monotonically decreasing function, the generation of the first monotonically decreasing function may be represented by the following formula 7):
7)
if the first monotonically decreasing function is a gamma function, the generation of the first monotonically decreasing function may be represented by the following formula 8):
8)
in this embodiment, as shown in fig. 3, after the histogram of luminance distribution is clipped by the first monotonic decreasing function, a luminance histogram (first luminance histogram) h remaining after clipping can be obtainedcut(t) in the lower region of the first monotonically decreasing function shown in FIG. 4, a clipped luminance histogram, such as the shaded portion (second luminance histogram) s shown in FIG. 4, can also be obtainedcut(t)。
The generation method of the second monotone decreasing function comprises the following steps:
calculating the area average value of the second brightness histogram;
under the condition that the area average value of the second brightness histogram is smaller than or equal to the preset first sampling parameter, the second monotonic decreasing function is the average value of the area of the second brightness histogram;
and generating a second monotonic decreasing function according to the preset first parameter and the area average value of the second brightness histogram under the condition that the area average value of the second brightness histogram is larger than the second parameter.
For example, the following steps are carried out: as shown in the following formula 9),
9)
as shown in figure 4 of the drawings,
the area average value of the second luminance histogram is represented, the compensation function is a monotonically decreasing function, and as shown in fig. 5, the clipped luminance histogram is compensated by the second monotonically decreasing function, and the obtained reconstructed luminance histogram can be represented as: u. ofr(t)＝hcut(t)+v(t)。
In this embodiment, since there are many promoters for adjusting the picture of the display device, the image quality enhancement process of the conventional method is prone to generate a splash screen and is difficult to be compatible with the splash screen.
For example, the following steps are carried out: the multiple look-up tables may be fused by equation 10) as follows:
equation 10) y ═ L (L)3rd(x))。
Since the image enhancement look-up table is a time-varying signal, in order to avoid frequent changes of the time-varying signal, the desired image enhancement look-up table may be filtered, for example, by a first-order inertial filtering, for example, the image enhancement look-up table may be filtered by the following formula 11):
equation 11)
Wherein the content of the first and second substances,
for the filtered image to enhance the look-up table,
is the output of the last filter and is,
for this time, the image enhancement look-up table to be filtered, p is the filter coefficient.
S105: calculating a current algorithm power consumption model according to the expected backlight and the expected image enhancement look-up table;
in this embodiment, the algorithm power consumption model represents a relationship between the algorithm power consumption and the ideal power saving capability, and may be represented by the following formula 12), for example:
equation 12) g (l)src，ldst)＝C(lsrc)-C(ldst)-ca-Δ；
Wherein, ca+ Δ represents the overall algorithm overhead, and Δ represents the disturbance of the algorithm overhead as a function of the overall mobile device load. g () represents the ideal power saving power consumption of the current power consumption adjusting means, lsrc represents the original backlight, and ldst represents the smooth output backlight of the backlight adjusting means. When the value of g () is higher, it shows that the current power saving capability of the device is stronger; when the value of g () is lower, it indicates that the current power saving capability of the device is weaker; when the value is less than zero, it indicates that the device is not only saving power, but is likely to consume more power.
S106: and adjusting the working frequency required by the display equipment for displaying the picture according to the algorithm power consumption and a preset working frequency lookup table.
The backlight adjustment, the algorithm calculation and the image quality enhancement process of the display image are all working frequencies required by the display equipment for image display. In the present embodiment, in order to save power consumption, the operating frequency required for screen display may be adjusted,
by the introduction, the algorithm power consumption model is analyzed to obtain the ideal power saving power consumption of the current power consumption adjusting device, and the working frequency required by the display equipment for displaying the picture is dynamically adjusted according to the preset lookup table.
Wherein, the preset working frequency lookup table can be the corresponding relation between the ideal power saving power consumption (g ()) of the current power consumption adjusting device and the working frequency of different working modes, wherein the working modes include: backlight adjustment, algorithm calculation, image quality enhancement of a display picture and the like.
In addition, the system load may also generate additional power consumption, such as CPU utilization, frequency, and the like, and in order to reduce the operation power consumption to the maximum extent, the embodiment of the present invention further considers the influence of the system load, and specifically, the method further includes:
calculating load power consumption of the display device;
and determining the working frequency of the calculation module, the image quality adjusting module and the backlight adjusting module according to the load power consumption.
The embodiment discloses a method and a device for adjusting power consumption of display equipment, which comprises the steps of reading a histogram of a current frame to-be-displayed picture, and calculating a characteristic value of the histogram of the to-be-displayed picture; acquiring an original backlight value, and calculating an expected backlight and an expected image enhancement lookup table according to the original backlight value and the histogram feature value; adjusting an output backlight of the display device in accordance with a desired backlight; adjusting the brightness of the picture to be displayed according to the expected image enhancement lookup table; calculating a current algorithm power consumption model according to the expected backlight and the expected image enhancement lookup table; and analyzing the algorithm power consumption model so as to adjust the working frequency required by the display equipment for displaying the picture according to the analysis result. Therefore, the aim of saving power consumption is achieved while the bright and easy-to-see display effect is provided for a user, namely the aim of dynamically adjusting the display picture in real time and limiting the power consumption overhead is achieved.
Furthermore, a low-precision histogram mode is adopted, the characteristic value of the histogram of the key frame is calculated in a self-adaptive mode, the characteristic value of the histogram of the non-key frame is predicted, and the system power consumption is saved.
Furthermore, the output backlight is subjected to smoothing treatment, high-frequency disturbance of the backlight is filtered, and the phenomenon of screen flashing is prevented.
Furthermore, a method for limiting contrast image enhancement is adopted, the display effect is optimized, and image distortion is avoided to the greatest extent.
Referring to fig. 6, a schematic diagram of a structure of a power consumption adjusting apparatus of a display device is shown, and in this embodiment, the apparatus includes:
a calculation module 601, a backlight adjustment module 602, and a picture quality adjustment module 603 performance adjustment module 604;
the calculation module is used for reading a histogram of a current frame to-be-displayed picture and calculating a characteristic value of the histogram; calculating an expected backlight and an expected image enhancement look-up table according to the original backlight value and the histogram feature value; sending the expected backlight to the backlight adjusting module, and sending the expected image enhancement lookup table to the image quality adjusting module; according to the expected backlight and the expected image, an algorithm power consumption model of a calculation module of a lookup table is enhanced; sending the algorithm power consumption model to the performance adjustment module;
the performance adjusting module is used for determining the working frequencies of the calculating module, the image quality adjusting module and the backlight adjusting module according to the algorithm power consumption and a preset working frequency lookup table, and sending performance adjusting signals to the calculating module, the image quality adjusting module and the backlight adjusting module;
the backlight adjusting module is used for adjusting the output backlight of the display equipment according to the expected backlight and adjusting the working frequency of the backlight adjusting module according to the performance adjusting signal sent by the performance adjusting module;
the image quality adjusting module is used for adjusting the brightness of the picture to be displayed according to the expected image enhancement look-up table and adjusting the working frequency of the image quality adjusting module according to the performance adjusting signal sent by the performance adjusting module.
The working content of the computing module may refer to the processes of S101, S102, and S105 described above in 1, and is not described again in this embodiment.
The working content of the backlight adjusting module may refer to the content introduced in S103, and is not described in detail in this embodiment.
The working content of the image quality adjusting module may refer to the content introduced in S104, and is not described in detail in this embodiment.
The working content of the performance adjusting module may refer to the working content of S106, which is not described in detail in this embodiment.
Optionally, the calculation module includes:
the characteristic value operator module is used for calculating the characteristic value of the histogram in a mode of accumulating the histogram gray scale probability;
the amplitude limiting submodule is used for carrying out amplitude limiting processing on the characteristic value of the histogram;
and the first filtering submodule is used for carrying out filtering processing on the characteristic value of the histogram.
Optionally, the calculating module and the backlight adjusting module are further configured to:
and smoothing the expected backlight.
Optionally, the calculating module and the image quality adjusting module are further configured to:
smoothing the expected image enhancement look-up table to filter high frequency signals of the expected image enhancement look-up table;
fusing the desired image enhancement look-up table with other enhancement look-up tables.
Optionally, the calculating module and the performance adjusting module are further configured to:
calculating load power consumption of the display device;
and determining the working frequency of the calculation module, the image quality adjusting module and the backlight adjusting module according to the load power consumption.
By the device of the embodiment, a histogram of a current frame to-be-displayed picture is read, and a characteristic value of the histogram of the to-be-displayed picture is calculated; acquiring an original backlight value, and calculating an expected backlight and an expected image enhancement lookup table according to the original backlight value and the histogram feature value; adjusting an output backlight of the display device in dependence on the desired backlight; adjusting the brightness of the picture to be displayed according to the expected image enhancement lookup table; calculating a current algorithm power consumption model according to the expected backlight and the expected image enhancement look-up table; and analyzing the algorithm power consumption model so as to adjust the working frequency required by the display equipment for displaying pictures according to the analysis result. Therefore, the aim of saving power consumption is achieved while the bright and easy-to-see display effect is provided for a user, namely the aim of dynamically adjusting the display picture in real time and limiting the power consumption overhead is achieved.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for adjusting power consumption of a display device, comprising:
reading a histogram of a current frame to-be-displayed picture, and calculating a characteristic value of the histogram of the to-be-displayed picture;
acquiring an original backlight value, and calculating an expected backlight and an expected image enhancement lookup table according to the original backlight value and the histogram feature value;
wherein computing a desired image enhancement look-up table from the original backlight values and the histogram feature values comprises: acquiring a backlight value corresponding to the characteristic value of the current frame histogram according to a preset backlight lookup table, and acquiring an image enhancement coefficient corresponding to the backlight value according to a preset image gain coefficient; calculating a plurality of enhancement control points corresponding to the Bezier curve according to the image enhancement coefficient, and generating an expected image enhancement lookup table according to the enhancement control points;
adjusting an output backlight of the display device in dependence on the desired backlight;
adjusting the brightness of the picture to be displayed according to the expected image enhancement lookup table;
calculating a current algorithm power consumption model according to the expected backlight and the expected image enhancement look-up table;
and adjusting the working frequency required by the display equipment for displaying the picture according to the algorithm power consumption and a preset working frequency lookup table.
2. The method according to claim 1, wherein the calculating the feature value of the histogram of the picture to be displayed comprises:
judging whether the current frame is a key frame;
if the current frame is a key frame, calculating a characteristic value of a histogram of the current frame to-be-displayed picture;
if the current frame is not a key frame, predicting a characteristic value of a histogram of a picture to be displayed of the current frame according to a plurality of key frames before the current frame;
carrying out amplitude limiting processing on the characteristic value of the histogram;
and performing low-pass filtering processing on the characteristic values of the histogram.
3. The method of claim 1, further comprising:
and smoothing the expected backlight.
4. The method of claim 1, further comprising:
smoothing the expected image enhancement look-up table to filter high frequency signals of the expected image enhancement look-up table;
fusing the desired image enhancement look-up table with other enhancement look-up tables.
5. The method of claim 1, further comprising:
calculating load power consumption of the display device;
and adjusting the working frequency required by the display equipment for displaying the picture according to the load power consumption.
6. A power consumption adjustment apparatus for a display device, comprising:
the device comprises a calculation module, a backlight adjusting module, an image quality adjusting module and a performance adjusting module;
the calculation module is used for reading a histogram of a current frame to-be-displayed picture and calculating a characteristic value of the histogram; calculating an expected backlight and an expected image enhancement look-up table according to the original backlight value and the histogram feature value; sending the expected backlight to the backlight adjusting module, and sending the expected image enhancement lookup table to the image quality adjusting module; according to the expected backlight and the expected image, an algorithm power consumption model of a calculation module of a lookup table is enhanced; sending the algorithm power consumption model to the performance adjustment module;
the performance adjusting module is used for determining the working frequencies of the calculating module, the image quality adjusting module and the backlight adjusting module according to the algorithm power consumption and a preset working frequency lookup table, and sending performance adjusting signals to the calculating module, the image quality adjusting module and the backlight adjusting module;
the backlight adjusting module is used for adjusting the output backlight of the display equipment according to the expected backlight and adjusting the working frequency of the backlight adjusting module according to the performance adjusting signal sent by the performance adjusting module;
the image quality adjusting module is used for adjusting the brightness of the picture to be displayed according to the expected image enhancement look-up table and adjusting the working frequency of the image quality adjusting module according to the performance adjusting signal sent by the performance adjusting module;
wherein computing a desired image enhancement look-up table from the original backlight values and the histogram feature values comprises: acquiring a backlight value corresponding to the characteristic value of the current frame histogram according to a preset backlight lookup table, and acquiring an image enhancement coefficient corresponding to the backlight value according to a preset image gain coefficient; and calculating a plurality of enhancement control points corresponding to the Bezier curve according to the image enhancement coefficient, and generating an expected image enhancement lookup table according to the enhancement control points.
7. The apparatus of claim 6, wherein the computing module comprises:
the characteristic value operator module is used for calculating the characteristic value of the histogram in a mode of accumulating the histogram gray scale probability;
the amplitude limiting submodule is used for carrying out amplitude limiting processing on the characteristic value of the histogram;
and the first filtering submodule is used for carrying out filtering processing on the characteristic value of the histogram.
8. The apparatus of claim 6, wherein the backlight adjusting module is further configured to:
and smoothing the expected backlight.
9. The apparatus of claim 6, wherein the image quality adjustment module is further configured to:
smoothing the expected image enhancement look-up table to filter high frequency signals of the image enhancement look-up table;
and fusing the image enhancement lookup table with other enhancement lookup tables.
10. The apparatus of claim 6, wherein the performance adjustment module is further configured to:
calculating load power consumption of the display device;
and determining the working frequency of the calculation module, the image quality adjusting module and the backlight adjusting module according to the load power consumption.
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| CN108257580B (en) * | 2016-12-28 | 2020-08-28 | 中科创达软件股份有限公司 | Display picture adjusting method and device based on backlight brightness |
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