CN106297731A - Strengthen the method and device of picture contrast, display screen and intelligent terminal - Google Patents
Strengthen the method and device of picture contrast, display screen and intelligent terminal Download PDFInfo
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- CN106297731A CN106297731A CN201610826114.0A CN201610826114A CN106297731A CN 106297731 A CN106297731 A CN 106297731A CN 201610826114 A CN201610826114 A CN 201610826114A CN 106297731 A CN106297731 A CN 106297731A
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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
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
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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
- G09G2320/066—Adjustment of display parameters for control of contrast
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Abstract
nullThe invention discloses a kind of method and device strengthening picture contrast、Display screen and intelligent television，The method includes: according to the view data of the current frame image obtained，Determine the gray-scale intensity corresponding to each LED in each backlight area，According to the gray-scale intensity corresponding to each LED in this each backlight area，Determine the pulse width modulation duty of each LED in this each backlight area、The luminance gain of each LED in back facet current and each backlight area，And according to the pulse width modulation duty of LED each in each backlight area、In back facet current and each backlight area, the luminance gain of each LED controls the display of current frame image，To realize picture superposition，Compared to prior art，Due to the fact that and utilize the luminance gain of each LED in each backlight area，Make it possible to the region that in the current frame image to display, brightness is strong strengthen，The low region of brightness is weakened，Improve the contrast of image，Details in image is become apparent from，Provide the user more preferable viewing experience.
Description
Technical field
The invention belongs to display technology field, particularly relate to a kind of strengthen the method and device of picture contrast, display
Screen and intelligent terminal.
Background technology
High dynamic range images (High-Dynamic Range is called for short HDR), compares common image, it is provided that more
Many dynamic ranges and image detail, according to LDR (Low-Dynamic Range) image of different time of exposure, utilize every
The LDR image of the corresponding optimal details of individual time of exposure synthesizes final HDR image, it is possible to preferably reflect in true environment
Visual effect.
It is visual sense that the image quality that HDR technology is brought promotes, even General Visitors also can with the naked eye distinguish, therefore modern
Year, HDR technology was carried one after another on tv product in numerous manufacturers.But nonetheless, the most not all tv product can become
" good join " of HDR technology.The utilization of HDR technology is not certain single link after all, but be related to that picture shows whole
Ecosystem.
Presenting two conditions of perfect HDR needs, first is high-contrast, and second is remarkable color representation power.Wherein
Contrast be the most important thing is for HDR.The minimum brightness that LCD TV can show is 0.1nits, and the brightest is 500 to 1000nits
Between, contrast only has 5000 to 1, if brightness raising twice to 1000nits, also can only achieve 10000 to 1.Therefore,
In order to present perfect HDR display effect, how realizing high-contrast is current problem demanding prompt solution.
Summary of the invention
The present invention provides a kind of and strengthens the method and device of picture contrast, display screen and intelligent terminal, existing in order to solve
There is the technical problem that in technology, the contrast of image is the highest.
First aspect present invention provides a kind of method strengthening picture contrast, including:
Image display device, according to the view data of the current frame image obtained, determines each light-emitting diodes in each backlight area
Gray-scale intensity corresponding to pipe LED；
According to the gray-scale intensity corresponding to each LED in described each backlight area, determine each LED in described each backlight area
The pulse width modulation duty of lamp, back facet current and luminance gain；
The aobvious of described current frame image is controlled according to described pulse width modulation duty, back facet current and described luminance gain
Show, to realize the enhancing of picture contrast.
Second aspect present invention provides a kind of device strengthening picture contrast, including:
First determines unit, for according to the view data of current frame image obtained, determines in each backlight area each
Gray-scale intensity corresponding to optical diode LED；
Second determines unit, for according to the gray-scale intensity corresponding to each LED in described each backlight area, determines described
The pulse width modulation duty of each LED, back facet current and luminance gain in each backlight area；
Control unit, for controlling described working as according to described pulse width modulation duty, back facet current and described luminance gain
The display of prior image frame, to realize the enhancing of picture contrast.
Third aspect present invention provides a kind of display screen, and this display screen comprises the device of above-mentioned enhancing picture contrast.
Fourth aspect present invention provides a kind of intelligent terminal, and this intelligent terminal comprises above-mentioned display screen.
Knowable to the invention described above embodiment, the present invention provides a kind of method strengthening picture contrast, and the method includes:
According to the view data of the current frame image obtained, determine the gray-scale intensity corresponding to each LED in each backlight area, according to this
Gray-scale intensity corresponding to each LED in each backlight area, determines the pulse width modulation duty of each LED in this each backlight area
The luminance gain of each LED in ratio, back facet current and each backlight area, and adjust according to the pulsewidth of LED each in each backlight area
In dutycycle processed, back facet current and each backlight area, the luminance gain of each LED controls the display of described current frame image, with reality
Existing picture superposition, compared to prior art, due to the fact that and utilize the luminance gain of each LED in each backlight area,
Making it possible to the strong region of brightness in the current frame image to display strengthen, the low region of brightness is weakened, and improves figure
The contrast of picture so that the details in image becomes apparent from, provides the user more preferable viewing experience.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those skilled in the art, on the premise of not paying creative work, it is also possible to root
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the system strengthening picture contrast in first embodiment of the invention；
Fig. 2 be second embodiment of the invention strengthens picture contrast method realize schematic flow sheet；
Fig. 3 be in the second embodiment shown in Fig. 2 of the present invention the refinement step of step 103 realize schematic flow sheet；
Fig. 4 be in the second embodiment shown in Fig. 2 of the present invention the refinement step of step 102 realize schematic flow sheet；
Fig. 5 is the structural representation of the device strengthening picture contrast in third embodiment of the invention；
Fig. 6 is the structural representation of the device strengthening picture contrast in fourth embodiment of the invention.
Detailed description of the invention
For making the goal of the invention of the present invention, feature, the advantage can be the most obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, is clearly and completely described the technical scheme in the embodiment of the present invention, it is clear that described reality
Executing example is only a part of embodiment of the present invention, and not all embodiments.Based on the embodiment in the present invention, people in the art
The every other embodiment that member is obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
Refer to Fig. 1, for first embodiment of the invention strengthens the structural representation of the system of picture contrast, this system
Including:
Processing module, control module, multiple LED drive module, multiple LED lamp bar, wherein, control module, LED drive mould
Block is provided on backlight drive board.
Wherein, the plurality of LED lamp bar is set directly at the lower section of display screen, and is to arrange by the way of straight-down negative, directly
The main advantage of following formula is to realize LOCAL DIMMIG (local backlight regulation) function, so-called LOCAL DIMMING, just
Being that the lamp shielded below is divided into some groups, such as 32 groups, 64 groups, 128 groups, often group is formed series system by some lamps, generally organizes number
The most, that divides is the thinnest, and dimming effect is the best, and the brightness often organizing lamp is determined by the brightness of picture so that the effect of display is the best,
More save electric energy.It is understood that each group of lamp is all a LED lamp bar, and each LED lamp bar constitutes an independence
Backlight area, including at least a LED in each backlight area.Wherein, each LED drive module is used for controlling
One LED lamp bar.
Wherein, processing module is for obtaining each LED in each backlight area according to the view data of the current frame image obtained
Pulse width modulation duty, the luminance gain of each LED in back facet current, and each backlight area, and the above-mentioned each back of the body that will obtain
In light region, the pulse width modulation duty of each LED, back facet current are sent to control module；Control module is for according to each backlight
In region, the pulse width modulation duty of each LED, back facet current control LED drive module, LED drive module control each backlight
Each LED in region.
Additionally, processing module also exists adjusting each LED according to the luminance gain of each LED in each backlight area determined
The brightness of position corresponding on display screen so that the bright region of image that display interface shows is brighter, and dark region is darker, has
Effect improves the contrast of image so that the details in image is apparent, improves the viewing experience of user.
It should be noted that above-mentioned processing module preferably SOC, above-mentioned control module are preferably micro-control unit
(MCU), above-mentioned LED drive module is preferably LED drive chip.Wherein, serial peripheral can be used between SOC and MCU
Interface (Serial Peripheral Interface, SPI) communicates, and can also lead between MCU and LED drive chip
Cross SPI to communicate.And MCU can use dominant frequency and the 32K FLASH of 50MHZ, the flank speed of SPI can be 25MHZ.
Additionally, multiple DC-DC module can also be arranged on above-mentioned backlight drive board, wherein, DC-DC module is used for and LED
Driving module connects one to one, for the back facet current obtained according to LED drive module and the difference of pulse width modulation duty
Stable voltage is provided for LED drive module.
Additionally, said system can also comprise power module, this power module is for carrying for the modules in this system
Power supply source, and the power supply that this power module provides can be specifically the alternating current power supply of 5V.
Based on the first embodiment shown in Fig. 1, it is explained below by the enhancing picture contrast of above-mentioned processing modules implement
Method, refer to Fig. 2, Fig. 2 be second embodiment of the invention strengthens picture contrast method realize schematic flow sheet,
The method of this enhancing picture contrast includes:
Step 201, image display device, according to the view data of the current frame image obtained, determine in each backlight area each
Gray-scale intensity corresponding to LED lamp；
In embodiments of the present invention, the view data of current frame image first will be obtained from the picture signal received, right
In intelligent television, this picture signal can be the picture signal that Set Top Box sends.
Wherein, after the view data getting current frame image, according to the view data of this current frame image, determine
Gray-scale intensity corresponding to each LED in each backlight area.
Wherein, the position of the LED in backlight area has mapping relations with the pixel region in current frame image, tool
Body, the concrete mapping relations of image shown in this region in the region of LED correspondence on a display screen and current frame image,
Hence, it can be determined that the pixel region corresponding to each LED, and determine each LED based on the pixel region corresponding to this each LED
The gray-scale intensity of lamp.Wherein, as a example by the gray-scale intensity determining a LED, need to add up this LED based on histogrammic mode
The gray-scale intensity of the pixel in the pixel region that lamp is corresponding, and calculate gray-scale intensity flat of pixel in this pixel region
Average, this using meansigma methods as the gray-scale intensity of this LED.
Step 202, according to the gray-scale intensity corresponding to each LED in described each backlight area, determine described each backlight district
The pulse width modulation duty of each LED, back facet current and luminance gain in territory；
Step 203, control described present frame figure according to described pulse width modulation duty, back facet current and described luminance gain
The display of picture, to realize the enhancing of picture contrast.
In embodiments of the present invention, in determining each backlight area after gray-scale intensity corresponding to each LED, according to this
Gray-scale intensity corresponding to each LED in each backlight area, determines the pulse width modulation duty of each LED in each backlight area,
Back facet current and luminance gain, and control current frame image according to this pulse width modulation duty, back facet current and luminance gain
Display, to realize the enhancing of picture contrast.By determining back facet current and brightness based on the gray-scale intensity corresponding to each LED
Gain, enabling the brightness of the LED of backlight area is adjusted based on back facet current and luminance gain so that display figure
Region bright in Xiang is brighter, and dark region is darker, strengthens the contrast of image so that the details of image shows and becomes apparent from, and changes
The viewing experience of kind user.
Based on the second embodiment shown in Fig. 2, referring to Fig. 3, Fig. 3 is step 103 in the second embodiment shown in Fig. 2 of the present invention
Refinement step realize schematic flow sheet, this step 103 includes:
Step 301, the pulse width modulation duty of each LED in described each backlight area and described back facet current are sent control
Molding block, electric according to pulse width modulation duty and the described backlight of each LED in described each backlight area by described control module
Flow control LED drive module, to control the brightness of each LED；
Step 302, adjust each LED according to the luminance gain of LED each in each backlight area corresponding on a display screen
The brightness of position, to realize the luminance gain of the described current frame image to display.
In embodiments of the present invention, in obtaining each backlight area the pulse width modulation duty of each LED, back facet current and
After luminance gain, pulse width modulation duty and the back facet current of each LED in this each backlight area are sent to control module,
Make control module can control LED according to the pulse width modulation duty of LED each in this backlight area and back facet current to drive
Module, is that the distribution of each LED is corresponding by this LED drive module pulse width modulation duty based on each LED and back facet current
Electric current, to control the brightness of each LED.Relative to prior art, in the embodiment of the present invention, not only determine pulse width modulation duty
Ratio, also determines that back facet current, and controls the brightness of LED based on back facet current, enabling promote the contrast of image.
Additionally, in the embodiment of the present invention, also the luminance gain of each LED according to backlight area is adjusted each LED and exists
The brightness of position corresponding on display screen, to realize the luminance gain of the current frame image to display, it is possible to effectively strengthens aobvious
The contrast of the image shown so that the details of this image is clearer, improves user's viewing experience.
Based on the second embodiment shown in Fig. 2, referring to Fig. 4, Fig. 4 is step 102 in the second embodiment shown in Fig. 2 of the present invention
Refinement step realize schematic flow sheet, this step 102 includes:
Step 401, according to the gray-scale intensity of each LED, the gray-scale intensity pre-set and arteries and veins in described each backlight area
The mapping relations between mapping relations and the gray-scale intensity pre-set and back facet current between wide modulation duty cycle, determine institute
State pulse width modulation duty and the back facet current of each LED in each backlight area；Perform step 402 and step 403 respectively.
Step 402, it is the first LED of non-extreme value for gray-scale intensity in described each backlight area, according to described first
The gray-scale intensity of LED and the luminance gain algorithm pre-set, calculate the luminance gain of described first LED；
Step 403, it is the second LED of extreme value to gray-scale intensity in described each backlight area, determines described second LED
Luminance gain be zero.
In embodiments of the present invention, pre-set the mapping relations between gray-scale intensity and pulse width modulation duty, and
Mapping relations between gray-scale intensity and back facet current.
Wherein it is determined that mapping relations between the gray-scale intensity pre-set and pulse width modulation duty and gray-scale intensity with
The mode of the mapping relations between back facet current may is that and first calculates the gray-scale intensity of all pixels in whole image, based on
The gray-scale intensity of all pixels determines that the full flour of this image amasss, this full flour is long-pending be in first pre-set in the range of time,
Back facet current could be arranged to the first numerical value, full flour long-pending be in second pre-set scope time, this back facet current is then pre-
The current curve first arranged, and based on this first pre-set scope time the first numerical value, and this is second when pre-setting scope
Current curve i.e. can get full flour long-pending with back facet current between mapping curve, and obtain backlight power and amass with full flour
Between mapping curve.Owing to full flour is long-pending and has incidence relation between gray-scale intensity, and there is the first transfer function, because of
This, it is possible to use full flour long-pending with gray-scale intensity between the first transfer function by between long-pending to above-mentioned backlight power and full flour
Mapping curve be converted to the mapping curve between gray-scale intensity and back facet current, to obtain between gray-scale intensity and back facet current
Mapping relations.And owing to having incidence relation between backlight power and pulse width modulation duty, and there is the second transfer function,
Therefore, can be based on backlight power and the full flour mapping curve between long-pending, the between backlight power and pulse width modulation duty
Two transfer functions and full flour amass the first transfer function between gray-scale intensity, determine gray-scale intensity and pulse width modulation duty
Mapping relations between Bi.It should be noted that full flour amasss the first transfer function between gray-scale intensity and backlight power
And the determination mode of the second transfer function between pulse width modulation duty is content of the prior art, does not repeats.
For the mapping relations, gray-scale intensity and the back of the body that are better understood between above-mentioned gray-scale intensity and pulse width modulation duty
The mode pre-set of the mapping relations between photoelectric current, is described below concrete application scenarios.
When backlight drive power panel rated output power is limited in 280W, the maximum of back facet current can be arranged on
470mA, then the relation that back facet current is long-pending with full flour is divided into following three sections:
1) during S≤30%
I=0.47A
2) 30%≤S≤50%
I=-0.75*S+0.735A
3) during 50%≤S≤100%
I=-0.22*S+0.47A
And refer to Fig. 5, for the schematic diagram of mapping curve in the embodiment of the present invention, this mapping curve comprise back facet current with
Mapping curve between full flour is long-pending, and backlight power and full flour long-pending between mapping relations, wherein, abscissa represents complete white
Area, vertical coordinate represents current value.And based on the mapping curve shown in Fig. 5, can obtain between gray-scale intensity and back facet current
Mapping relations, and obtain the mapping relations between gray-scale intensity and pulse width modulation duty.
In embodiments of the present invention, in obtaining each backlight area after the gray-scale intensity of each LED, utilization is set in advance
Between mapping relations and the gray-scale intensity pre-set and back facet current between gray-scale intensity and the pulse width modulation duty put
Mapping relations, determine pulse width modulation duty and the back facet current of each LED in each backlight area, specifically include: utilize each
In backlight area, the gray-scale intensity of each LED searches the mapping pass between gray-scale intensity and the pulse width modulation duty pre-set
System, determines the pulse width modulation duty of each LED in each backlight area；Utilize the gray-scale intensity of each LED in each backlight area
Search the mapping relations between gray-scale intensity and the back facet current pre-set, determine the backlight of each LED in each backlight area
Electric current.
Further, in embodiments of the present invention, also by the gray-scale intensity of each LED that determines in each backlight area whether
For extreme value, and the LED that all gray-scale intensity are non-extreme value is referred to as the first LED, is extreme value by all gray-scale intensity
LED is referred to as the second LED.For each the first LED, by the gray-scale intensity according to this first LED and set in advance
The luminance gain algorithm put, calculates the luminance gain of this first LED.And for each the second LED, second will be determined
The luminance gain of LED is zero.Wherein, luminance gain algorithm is utilized to calculate only for the LED that gray-scale intensity is non-extreme value bright
Degree gain mainly there is also the demand improving brightness in view of the LED that gray-scale intensity is non-extreme value, and gray-scale intensity is pole
Even if the LED of value increases gain also cannot improve brightness, therefore, it is not necessary to carry out the LED that gray-scale intensity is extreme value
Luminance gain.
Wherein, gray-scale intensity be the LED of extreme value can be gray value be the LED of 0 or 255.
Wherein, luminance gain algorithm is as follows:
Wherein, s represents the average gray-scale intensity of backlight area, and n represents the number of LED in backlight area, and (i j) represents
LED coordinate in backlight area, w represents backlight area, xi,jRepresent in backlight area and be in (i, j) LED of position
Gray-scale intensity, ki,jRepresent and be in (i, j) luminance factor of the LED of position, Yi,jRepresent and be in (i, j) LED of position
Luminance gain；
Wherein, x is worked asi,jDuring more than or equal to preset gray scale brightness, this ki,jFor the coefficient more than 1, work as xi,jLess than presetting ash
During the brightness of rank, this ki,jFor the coefficient less than 1.
Wherein, the average gray-scale intensity of backlight area can utilize the gray-scale intensity of all LED in backlight area to ask
Meansigma methods obtains.
In embodiments of the present invention, the mapping between the gray-scale intensity and the pulse width modulation duty that are pre-set by utilization
Mapping relations between relation and the gray-scale intensity pre-set and back facet current, enabling effectively determine each backlight area
In the pulse width modulation duty of each LED and back facet current, enabling real by pulse width modulation duty and back facet current
The now control to LED brightness, and for the first LED that gray-scale intensity in backlight area is non-extreme value, also can according to this
The gray-scale intensity of one LED and the luminance gain algorithm pre-set, calculate the luminance gain of this first LED, enabling
The contrast of image is strengthened so that the details of image becomes apparent from, and user's viewing experience is more by the way of adjusting luminance gain
Good.
It should be noted that method based on above-mentioned enhancing picture contrast enable to image display time the brightest
Degree reaches 1000nit, and dark picture minimum brightness reaches 0.0001nit, reaches the high dynamic contrast effect of 10000000:1, improves
HDR effect.
The device of the enhancing picture contrast being described more fully below in the embodiment of the present invention, it should be noted that this increasing
The device of strong picture contrast can be specifically the processing module in first embodiment shown in Fig. 1, and specifically can be by SOC
Realize, in order to be better understood from, refer to below embodiment.
Refer to Fig. 5, for third embodiment of the invention strengthens the structural representation of the device of picture contrast, this device
Including: first determine module 501, second determine module 502, control unit 503.
First determines unit 501, for the view data according to the current frame image obtained, determines in each backlight area each
Gray-scale intensity corresponding to LED lamp；
In embodiments of the present invention, the view data of current frame image first will be obtained from the picture signal received, right
In intelligent television, this picture signal can be the picture signal that Set Top Box sends.
Wherein, after the view data getting current frame image, first determines that unit 501 is according to this current frame image
View data, determine the gray-scale intensity corresponding to each LED in each backlight area.
Wherein, the position of the LED in backlight area has mapping relations with the pixel region in current frame image, tool
Body, the concrete mapping relations of image shown in this region in the region of LED correspondence on a display screen and current frame image,
Hence, it can be determined that the pixel region corresponding to each LED, and determine each LED based on the pixel region corresponding to this each LED
The gray-scale intensity of lamp.Wherein, as a example by the gray-scale intensity determining a LED, need to add up this LED based on histogrammic mode
The gray-scale intensity of the pixel in the pixel region that lamp is corresponding, and calculate gray-scale intensity flat of pixel in this pixel region
Average, this using meansigma methods as the gray-scale intensity of this LED.
Second determines unit 502, for according to the gray-scale intensity corresponding to each LED in described each backlight area, determines
The pulse width modulation duty of each LED, back facet current and luminance gain in described each backlight area；
Control unit 503, for controlling described according to described pulse width modulation duty, back facet current and described luminance gain
The display of current frame image, to realize the enhancing of picture contrast.
In embodiments of the present invention, in determining each backlight area after gray-scale intensity corresponding to each LED, second is true
Cell 502, according to the gray-scale intensity corresponding to each LED in this each backlight area, determines each LED in each backlight area
Pulse width modulation duty, back facet current and luminance gain, and by control unit 503 according to this pulse width modulation duty, backlight electricity
Stream and luminance gain control the display of current frame image, to realize the enhancing of picture contrast.By based on corresponding to each LED
Gray-scale intensity determine back facet current and luminance gain, enabling based on back facet current and luminance gain to backlight area
The brightness of LED is adjusted so that region bright in display image is brighter, and dark region is darker, strengthens the contrast of image,
The details making image shows and becomes apparent from, and improves the viewing experience of user.
Refer to Fig. 6, for fourth embodiment of the invention strengthens the structural representation of the device of picture contrast, this device
Comprise and in the 3rd embodiment as shown in Figure 5 first determine module 501, second determine module 502, control unit 503, and with figure
Content described in 3rd embodiment shown in 5 is similar, and here is omitted.
In embodiments of the present invention, this control unit 503 includes: transmitting element 601, adjustment unit 602.
Transmitting element 601, for by electric to pulse width modulation duty and the described backlight of each LED in described each backlight area
Stream sends control module, by described control module according to the pulse width modulation duty of each LED in described each backlight area and institute
State back facet current and control LED drive module, to control the brightness of described each LED；
Adjustment unit 602, adjusts each LED at display screen for the luminance gain according to LED each in each backlight area
The brightness of upper corresponding position, to realize the luminance gain of the described current frame image to display.
In embodiments of the present invention, in obtaining each backlight area the pulse width modulation duty of each LED, back facet current and
After luminance gain, pulse width modulation duty and the back facet current of each LED in this each backlight area are sent by transmitting element 601
To control module so that control module can be according to the pulse width modulation duty of LED each in this backlight area and back facet current
Control LED drive module, this LED drive module pulse width modulation duty based on each LED and back facet current are each LED
Distribute corresponding electric current, to control the brightness of each LED.Relative to prior art, in the embodiment of the present invention, not only determine pulsewidth
Modulation duty cycle, also determines that back facet current, and controls the brightness of LED based on back facet current, enabling promote the right of image
Degree of ratio.
Additionally, in the embodiment of the present invention, the luminance gain of each LED according to backlight area is adjusted by adjustment unit 602
The brightness of the position that each LED is corresponding on a display screen, to realize the luminance gain of the current frame image to display, it is possible to have
Effect strengthens the contrast of the image of display so that the details of this image is clearer, improves user's viewing experience.
In embodiments of the present invention, this second determines that unit 502 includes:
3rd determines unit 603, for according to the gray-scale intensity of each LED in described each backlight area, pre-sets
Reflecting between mapping relations and the gray-scale intensity pre-set and the back facet current between gray-scale intensity and pulse width modulation duty
Penetrate relation, determine pulse width modulation duty and the back facet current of each LED in described each backlight area；
Computing unit 604, being used for for gray-scale intensity in described each backlight area is the first LED of non-extreme value, according to
The gray-scale intensity of described first LED and the luminance gain algorithm pre-set, calculate the luminance gain of described first LED；
4th determines unit 605, for being the second LED of extreme value to gray-scale intensity in described each backlight area, determines
The luminance gain of described second LED is zero.
In embodiments of the present invention, the described 3rd determines that unit 603 specifically includes:
First searches module 606, pre-sets for utilizing the gray-scale intensity of each LED in described each backlight area to search
Gray-scale intensity and pulse width modulation duty between mapping relations, determine each LED in described each backlight area pulsewidth adjust
Dutycycle processed；
Second searches module 607, pre-sets for utilizing the gray-scale intensity of each LED in described each backlight area to search
Gray-scale intensity and back facet current between mapping relations, determine the back facet current of each LED in described each backlight area.
In embodiments of the present invention, described computing unit 604 specifically for:
The luminance gain of the first LED is calculated according to equation below:
Wherein, s represents the average gray-scale intensity of backlight area, and n represents the number of LED in backlight area, and (i j) represents
LED coordinate in backlight area, w represents backlight area, xi,jRepresent in backlight area and be in (i, j) LED of position
Gray-scale intensity, ki,jRepresent and be in (i, j) luminance factor of the LED of position, Yi,jRepresent and be in (i, j) LED of position
Luminance gain；
Wherein, x is worked asi,jDuring more than or equal to preset gray scale brightness, this ki,jFor the coefficient more than 1, work as xi,jLess than presetting ash
During the brightness of rank, this ki,jFor the coefficient less than 1.
In embodiments of the present invention, pre-set the mapping relations between gray-scale intensity and pulse width modulation duty, and
Mapping relations between gray-scale intensity and back facet current.
Wherein it is determined that mapping relations between the gray-scale intensity pre-set and pulse width modulation duty and gray-scale intensity with
The mode of the mapping relations between back facet current may is that and first calculates the gray-scale intensity of all pixels in whole image, based on
The gray-scale intensity of all pixels determines that the full flour of this image amasss, this full flour is long-pending be in first pre-set in the range of time,
Back facet current could be arranged to the first numerical value, full flour long-pending be in second pre-set scope time, this back facet current is then pre-
The current curve first arranged, and based on this first pre-set scope time the first numerical value, and this is second when pre-setting scope
Current curve i.e. can get full flour long-pending with back facet current between mapping curve, and obtain backlight power and amass with full flour
Between mapping curve.Owing to full flour is long-pending and has incidence relation between gray-scale intensity, and there is the first transfer function, because of
This, it is possible to use full flour long-pending with gray-scale intensity between the first transfer function by between long-pending to above-mentioned backlight power and full flour
Mapping curve be converted to the mapping curve between gray-scale intensity and back facet current, to obtain between gray-scale intensity and back facet current
Mapping relations.And owing to having incidence relation between backlight power and pulse width modulation duty, and there is the second transfer function,
Therefore, can be based on backlight power and the full flour mapping curve between long-pending, the between backlight power and pulse width modulation duty
Two transfer functions and full flour amass the first transfer function between gray-scale intensity, determine gray-scale intensity and pulse width modulation duty
Mapping relations between Bi.It should be noted that full flour amasss the first transfer function between gray-scale intensity and backlight power
And the determination mode of pass the second transfer function between pulse width modulation duty is content of the prior art, does not the most do superfluous
State.
For the mapping relations, gray-scale intensity and the back of the body that are better understood between above-mentioned gray-scale intensity and pulse width modulation duty
The mode pre-set of the mapping relations between photoelectric current, is described below concrete application scenarios.
When backlight drive power panel rated output power is limited in 280W, the maximum of back facet current can be arranged on
470mA, then the relation that back facet current is long-pending with full flour is divided into following three sections:
1) during S≤30%
I=0.47A
2) 30%≤S≤50%
I=-0.75*S+0.735A
3) during 50%≤S≤100%
I=-0.22*S+0.47A
And refer to Fig. 5, for the schematic diagram of mapping curve in the embodiment of the present invention, this mapping curve comprise back facet current with
Mapping curve between full flour is long-pending, and backlight power and full flour long-pending between mapping relations, wherein, abscissa represents complete white
Area, vertical coordinate represents current value.And based on the mapping curve shown in Fig. 5, can obtain between gray-scale intensity and back facet current
Mapping relations, and obtain the mapping relations between gray-scale intensity and pulse width modulation duty.
In embodiments of the present invention, in obtaining each backlight area after the gray-scale intensity of each LED, the 3rd determines unit
Mapping relations between 603 gray-scale intensity that utilization is pre-set and pulse width modulation duty and the gray-scale intensity pre-set
And the mapping relations between back facet current, determine pulse width modulation duty and the back facet current of each LED in each backlight area, tool
Body includes: first searches module 606 utilizes the gray-scale intensity of each LED in each backlight area to search the gray-scale intensity pre-set
And the mapping relations between pulse width modulation duty, determine the pulse width modulation duty of each LED in each backlight area；Second looks into
Look for module 607 utilize the gray-scale intensity of each LED in each backlight area search the gray-scale intensity that pre-sets and back facet current it
Between mapping relations, determine the back facet current of each LED in each backlight area.
Further, in embodiments of the present invention, also by the gray-scale intensity of each LED that determines in each backlight area whether
For extreme value, and the LED that all gray-scale intensity are non-extreme value is referred to as the first LED, is extreme value by all gray-scale intensity
LED is referred to as the second LED.For each the first LED, computing unit 604 is according to the gray-scale intensity of this first LED
And the luminance gain algorithm pre-set, calculate the luminance gain of this first LED.And for each the second LED, the 4th
Determine that unit 605 determines that the luminance gain of the second LED is zero.Wherein, utilize only for the LED that gray-scale intensity is non-extreme value
Luminance gain algorithm calculates luminance gain and mainly there is also the need improving brightness in view of the LED that gray-scale intensity is non-extreme value
Ask, even and if LED that gray-scale intensity is extreme value increases gain and also cannot improve brightness, therefore, it is not necessary to gray-scale intensity
LED for extreme value carries out luminance gain.
Wherein, gray-scale intensity be the LED of extreme value can be gray value be the LED of 0 or 255.
Wherein, luminance gain algorithm is as follows:
Wherein, s represents the average gray-scale intensity of backlight area, and n represents the number of LED in backlight area, and (i j) represents
LED coordinate in backlight area, w represents backlight area, xi,jRepresent in backlight area and be in (i, j) LED of position
Gray-scale intensity, ki,jRepresent and be in (i, j) luminance factor of the LED of position, Yi,jRepresent and be in (i, j) LED of position
Luminance gain；
Wherein, x is worked asi,jDuring more than or equal to preset gray scale brightness, this ki,jFor the coefficient more than 1, work as xi,jLess than presetting ash
During the brightness of rank, this ki,jFor the coefficient less than 1.
Wherein, the average gray-scale intensity of backlight area can utilize the gray-scale intensity of all LED in backlight area to ask
Meansigma methods obtains.
In embodiments of the present invention, the mapping between the gray-scale intensity and the pulse width modulation duty that are pre-set by utilization
Mapping relations between relation and the gray-scale intensity pre-set and back facet current, enabling effectively determine each backlight area
In the pulse width modulation duty of each LED and back facet current, enabling real by pulse width modulation duty and back facet current
The now control to LED brightness, and for the first LED that gray-scale intensity in backlight area is non-extreme value, also can according to this
The gray-scale intensity of one LED and the luminance gain algorithm pre-set, calculate the luminance gain of this first LED, enabling
The contrast of image is strengthened so that the details of image becomes apparent from, and user's viewing experience is more by the way of adjusting luminance gain
Good
In fourth embodiment of the invention, relating to a kind of display screen, this display screen comprises in the 3rd embodiment shown in Fig. 5
Strengthening the device of picture contrast, in fifth embodiment of the invention, relate to a kind of intelligent terminal, this intelligent terminal comprises above-mentioned
Display screen in 4th embodiment.
In several embodiments provided herein, it should be understood that disclosed apparatus and method, can be passed through it
Its mode realizes.Such as, device embodiment described above is only schematically, such as, and the division of described module, only
Being only a kind of logic function to divide, actual can have other dividing mode, the most multiple modules or assembly to tie when realizing
Close or be desirably integrated into another system, or some features can be ignored, or not performing.Another point, shown or discussed
Coupling each other or direct-coupling or communication connection can be the INDIRECT COUPLING by some interfaces, device or module or logical
Letter connects, and can be electrical, machinery or other form.
The described module illustrated as separating component can be or may not be physically separate, shows as module
The parts shown can be or may not be physical module, i.e. may be located at a place, or can also be distributed to multiple
On mixed-media network modules mixed-media.Some or all of module therein can be selected according to the actual needs to realize the mesh of the present embodiment scheme
's.
It addition, each functional module in each embodiment of the present invention can be integrated in a processing module, it is also possible to
It is that modules is individually physically present, it is also possible to two or more modules are integrated in a module.Above-mentioned integrated mould
Block both can realize to use the form of hardware, it would however also be possible to employ the form of software function module realizes.
If described integrated module realizes and as independent production marketing or use using the form of software function module
Time, can be stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially
The part that in other words prior art contributed or this technical scheme completely or partially can be with the form of software product
Embodying, this computer software product is stored in a storage medium, including some instructions with so that a computer
Equipment (can be personal computer, server, or the network equipment etc.) performs the complete of method described in each embodiment of the present invention
Portion or part steps.And aforesaid storage medium includes: USB flash disk, portable hard drive, read only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
It should be noted that for aforesaid each method embodiment, in order to simplicity describes, therefore it is all expressed as a series of
Combination of actions, but those skilled in the art should know, the present invention is not limited by described sequence of movement because
According to the present invention, some step can use other order or carry out simultaneously.Secondly, those skilled in the art also should know
Knowing, it might not be all this that embodiment described in this description belongs to preferred embodiment, involved action and module
Bright necessary.
In the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, and does not has the portion described in detail in certain embodiment
Point, may refer to the associated description of other embodiments.
More than for a kind of strengthening the method and device of picture contrast, display screen and intelligent terminal to provided by the present invention
Description, for those skilled in the art, according to the thought of the embodiment of the present invention, in specific embodiments and applications
All will change, to sum up, this specification content should not be construed as limitation of the present invention.
Claims (12)
1. the method strengthening picture contrast, it is characterised in that described method includes:
Image display device, according to the view data of the current frame image obtained, determines each light emitting diode in each backlight area
Gray-scale intensity corresponding to LED；
According to the gray-scale intensity corresponding to each LED in described each backlight area, determine each LED in described each backlight area
Pulse width modulation duty, back facet current and luminance gain；
The display of described current frame image is controlled according to described pulse width modulation duty, back facet current and described luminance gain, with
Realize the enhancing of picture contrast.
Method the most according to claim 1, it is characterised in that described according to described pulse width modulation duty, back facet current
And luminance gain controls the display of described current frame image, including:
Pulse width modulation duty and the described back facet current of each LED in described each backlight area are sent control module, by institute
State control module to control LED drive according to pulse width modulation duty and the described back facet current of each LED in described each backlight area
Dynamic model block, to control the brightness of described each LED；
Luminance gain according to LED each in each backlight area adjusts the brightness of each LED position corresponding on a display screen,
To realize the luminance gain of the described current frame image to display.
Method the most according to claim 1 and 2, it is characterised in that described according to LED institute each in described each backlight area
Corresponding gray-scale intensity, determines that the pulse width modulation duty of each LED in described each backlight area, back facet current and brightness increase
Benefit, including:
According to the gray-scale intensity of each LED, the gray-scale intensity pre-set and pulse width modulation duty in described each backlight area
Between mapping relations and the gray-scale intensity pre-set and back facet current between mapping relations, determine described each backlight area
In the pulse width modulation duty of each LED and back facet current；
Being the first LED of non-extreme value for gray-scale intensity in described each backlight area, the GTG according to described first LED is bright
Degree and the luminance gain algorithm pre-set, calculate the luminance gain of described first LED；
It is the second LED of extreme value to gray-scale intensity in described each backlight area, determines that the luminance gain of described second LED is
Zero.
Method the most according to claim 3, it is characterised in that the described average GTG according to described each backlight area is bright
Degree, mapping relations between the gray-scale intensity and the pulse width modulation duty that pre-set and the gray-scale intensity pre-set and backlight
Mapping relations between electric current, determine pulse width modulation duty and the back facet current of each LED in described each backlight area, bag
Include:
The gray-scale intensity utilizing each LED in described each backlight area searches the gray-scale intensity and pulse width modulation duty pre-set
Mapping relations between Bi, determine the pulse width modulation duty of each LED in described each backlight area；
The gray-scale intensity utilizing each LED in described each backlight area is searched between gray-scale intensity and the back facet current pre-set
Mapping relations, determine the back facet current of each LED in described each backlight area.
Method the most according to claim 3, it is characterised in that the described gray-scale intensity according to described first LED and pre-
The luminance gain algorithm first arranged, calculates the luminance gain of described first LED, including:
The luminance gain of the first LED is calculated according to equation below:
Wherein, s represents the average gray-scale intensity of backlight area, and n represents the number of LED in backlight area, and (i j) represents LED
Lamp coordinate in backlight area, w represents backlight area, xi,jRepresent in backlight area and be in (i, j) ash of the LED of position
Rank brightness, ki,jRepresent and be in (i, j) luminance factor of the LED of position, Yi,jRepresent and be in that (i, j) LED of position is bright
Degree gain；
Wherein, x is worked asi,jDuring more than or equal to preset gray scale brightness, this ki,jFor the coefficient more than 1, work as xi,jBright less than preset gray scale
When spending, this ki,jFor the coefficient less than 1.
6. the device strengthening picture contrast, it is characterised in that described device includes:
First determines unit, for according to the view data of current frame image obtained, determines in each backlight area each luminous two
Gray-scale intensity corresponding to the pipe LED of pole；
Second determines unit, for according to the gray-scale intensity corresponding to each LED in described each backlight area, determines described each back of the body
The pulse width modulation duty of each LED, back facet current and luminance gain in light region；
Control unit, for controlling described present frame according to described pulse width modulation duty, back facet current and described luminance gain
The display of image, to realize the enhancing of picture contrast.
Device the most according to claim 6, it is characterised in that described control unit includes:
Transmitting element, for sending pulse width modulation duty and the described back facet current of each LED in described each backlight area
Control module, by described control module according to the pulse width modulation duty of each LED in described each backlight area and described backlight
Electric current controls LED drive module, to control the brightness of described each LED；
Adjustment unit, adjusts each LED for the luminance gain according to LED each in each backlight area corresponding on a display screen
The brightness of position, to realize the luminance gain of the described current frame image to display.
8. according to the device described in claim 6 or 7, it is characterised in that described second determines that unit includes:
3rd determines unit, for according to the gray-scale intensity of each LED, the gray-scale intensity pre-set in described each backlight area
And the mapping relations between mapping relations and the gray-scale intensity pre-set and back facet current between pulse width modulation duty, really
Determine pulse width modulation duty and the back facet current of each LED in described each backlight area；
Computing unit, for being the first LED of non-extreme value for gray-scale intensity in described each backlight area, according to described first
The gray-scale intensity of LED and the luminance gain algorithm pre-set, calculate the luminance gain of described first LED；
4th determines unit, for being the second LED of extreme value to gray-scale intensity in described each backlight area, determines described second
The luminance gain of LED is zero.
Device the most according to claim 7, it is characterised in that the described 3rd determines that unit includes:
First searches module, for utilizing the gray-scale intensity of each LED in described each backlight area to search the GTG pre-set
Mapping relations between brightness and pulse width modulation duty, determine the pulse width modulation duty of each LED in described each backlight area
Ratio；
Second searches module, for utilizing the gray-scale intensity of each LED in described each backlight area to search the GTG pre-set
Mapping relations between brightness and back facet current, determine the back facet current of each LED in described each backlight area.
Device the most according to claim 7, it is characterised in that described computing unit specifically for:
The luminance gain of the first LED is calculated according to equation below:
Wherein, s represents the average gray-scale intensity of backlight area, and n represents the number of LED in backlight area, and (i j) represents LED
Lamp coordinate in backlight area, w represents backlight area, xi,jRepresent in backlight area and be in (i, j) ash of the LED of position
Rank brightness, ki,jRepresent and be in (i, j) luminance factor of the LED of position, Yi,jRepresent and be in that (i, j) LED of position is bright
Degree gain；
Wherein, x is worked asi,jDuring more than or equal to preset gray scale brightness, this ki,jFor the coefficient more than 1, work as xi,jBright less than preset gray scale
When spending, this ki,jFor the coefficient less than 1.
11. 1 kinds of display screens, it is characterised in that described display screen comprises the enhancing figure described in claim 6 to 10 any one
The device of image contrast.
12. 1 kinds of intelligent terminal, it is characterised in that described intelligent terminal comprises the display screen described in claim 11.
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| CN201610826114.0A CN106297731A (en) | 2016-09-14 | 2016-09-14 | Strengthen the method and device of picture contrast, display screen and intelligent terminal |
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