CN105913811A - Backlight source, display panel, television and area light dimming method - Google Patents
Backlight source, display panel, television and area light dimming method Download PDFInfo
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- CN105913811A CN105913811A CN201610498141.XA CN201610498141A CN105913811A CN 105913811 A CN105913811 A CN 105913811A CN 201610498141 A CN201610498141 A CN 201610498141A CN 105913811 A CN105913811 A CN 105913811A
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- backlight
- gray scale
- backlight module
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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
-
- 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
- G09G3/3413—Details of control of colour illumination sources
-
- 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
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/57—Control of contrast or brightness
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a backlight source, a display panel, a television and an area light dimming method. A full-screen image gray level and a unit image gray level are analyzed from a video signal, a corresponding full-screen current peak value of the backlight module is output according to the full-screen image gray level, a corresponding LED unit current duty ratio of the backlight module is output according to the unit image gray level, and different backlight areas of the backlight module are at different brightness levels under a same full-screen current peak value and different LED unit current duty ratios, so that the peak brightness and the contrast ratio of images are increased, and meanwhile the overall power consumption is reduced.
Description
Technical field
Embodiment of the present invention relates to display floater field, particularly relates to a kind of backlight, display
Panel, television set and local dimming method.
Background technology
Cloth according to liquid crystal display screen backlight LED (Light Emitting Diode, light emitting diode)
Office and installation site, LCDs can be divided into direct-light type LED backlight display screen and marginal mode
LED backlit display.Wherein, direct-light type LED backlight display screen is that many pieces of LED are lined up array,
It is placed on after light guide plate and liquid crystal panel, direct irradiation liquid crystal panel.Direct-light type LED backlight assembly
Have region backlight control techniques, can be the most micro-according to the light varience of image zones of different
Adjust the brightness of the LED in each region, such that it is able to increase substantially picture dynamic contrast.
In direct-light type LED backlight technology, prior art uses fixing back facet current peak value, and
And in subregional adjust back facet current dutycycle mode, with feasible region dim.
Inventor during realizing the present invention, find prior art there is problems in that due to
Back facet current peak value is fixing, and whole-screen brightness is the highest, and overall design power is the biggest, and cost is the highest.
Further, the peak brightness of this kind of mode is lower than whole-screen brightness, and contrast promotes limited.
Summary of the invention
Embodiment of the present invention is mainly solving the technical problems that provide a kind of backlight, display surface
Plate, television set and local dimming method, which solving existing back facet current peak value, to there is brightness low
The technical problem low with contrast.
For solving above-mentioned technical problem, the present invention provides techniques below scheme:
In first aspect, the embodiment of the present invention provides a kind of backlight.Described backlight includes:
Backlight module, including several LED unit；
System on Chip/SoC, is used for receiving video signal, parses full-screen image ash from described video signal
Degree and cell picture gray scale, and according to pre-building the full frame of full-screen image gray scale and backlight module
Inverse relation between current peak, calculates the backlight module corresponding to described full-screen image gray scale
Full frame current peak, and mono-according to the LED pre-building cell picture gray scale and backlight module
Proportional relation between elementary current dutycycle, calculates the backlight corresponding to described cell picture gray scale
The LED unit current duty cycle of module；
Region backlight control circuit, respectively with each of described System on Chip/SoC and described backlight module
LED unit connects, for the backlight corresponding to described full-screen image gray scale calculated described in basis
The full frame current peak of module and the described backlight corresponding to described cell picture gray scale calculated
The LED unit current duty cycle of module, controls the brightness of each LED unit of described backlight module.
Alternatively, described region backlight control circuit includes:
LED drive power, the one end with each LED unit of described backlight module connects respectively,
For providing power supply for each LED unit described；
LED drive circuit, mono-with each LED of described System on Chip/SoC and described backlight module respectively
The other end of unit connects, for the back of the body corresponding to described full-screen image gray scale calculated described in basis
The full frame current peak of light module and the described back of the body corresponding to described cell picture gray scale calculated
The LED unit current duty cycle of light module, controls each LED unit bright of described backlight module
Degree.
Alternatively, described LED drive circuit includes:
Switch module, including several metal-oxide-semiconductors, LED described in the drain electrode of metal-oxide-semiconductor described in one and
The other end of unit connects；
Resistance unit, including several resistance, metal-oxide-semiconductor described in one end of resistance described in one and
Source electrode connects, the other end ground connection of resistance described in one；
Backlight lamp control device, described backlight lamp control device and described System on Chip/SoC connect；Described backlight
Lamp controller include several control passage, described in one control passage respectively with metal-oxide-semiconductor described in
Grid and source electrode connect；Described backlight lamp control device according to described in calculate described full-screen image ash
The full frame current peak of the backlight module corresponding to degree and the described described cell picture ash calculated
The LED unit current duty cycle of the backlight module corresponding to degree, by described switch module and described
Resistance unit controls the brightness of each LED unit of described backlight module.
In second aspect, the embodiment of the present invention provides a kind of display floater.Described display floater includes:
Display module, including several elementary areas；
Backlight module, is arranged at the underface of described display module, and described backlight module includes
Several LED unit, elementary area one_to_one corresponding described in LED unit described in one and；
System on Chip/SoC, is used for receiving video signal, parses full-screen image ash from described video signal
Degree and cell picture gray scale, and according to pre-building the full frame of full-screen image gray scale and backlight module
Inverse relation between current peak, calculates the backlight module corresponding to described full-screen image gray scale
Full frame current peak, and mono-according to the LED pre-building cell picture gray scale and backlight module
Proportional relation between elementary current dutycycle, calculates the backlight corresponding to described cell picture gray scale
The LED unit current duty cycle of module；
Region backlight control circuit, respectively with each of described System on Chip/SoC and described backlight module
LED unit connects, for the backlight corresponding to described full-screen image gray scale calculated described in basis
The full frame current peak of module and the described backlight corresponding to described cell picture gray scale calculated
The LED unit current duty cycle of module, controls the brightness of each LED unit of described backlight module.
Alternatively, described region backlight control circuit includes:
LED drive power, the one end with each LED unit of described backlight module connects respectively,
For providing power supply for each LED unit described；
LED drive circuit, mono-with each LED of described System on Chip/SoC and described backlight module respectively
The other end of unit connects, for the back of the body corresponding to described full-screen image gray scale calculated described in basis
The full frame current peak of light module and the described back of the body corresponding to described cell picture gray scale calculated
The LED unit current duty cycle of light module, controls each LED unit bright of described backlight module
Degree.
Alternatively, described LED drive circuit includes:
Switch module, including several metal-oxide-semiconductors, LED described in the drain electrode of metal-oxide-semiconductor described in one and
The other end of unit connects；
Resistance unit, including several resistance, metal-oxide-semiconductor described in one end of resistance described in one and
Source electrode connects, the other end ground connection of resistance described in one；
Backlight lamp control device, described backlight lamp control device and described System on Chip/SoC connect；Described backlight
Lamp controller include several control passage, described in one control passage respectively with metal-oxide-semiconductor described in
Grid and source electrode connect；Described backlight lamp control device according to described in calculate described full-screen image ash
The full frame current peak of the backlight module corresponding to degree and the described described cell picture ash calculated
The LED unit current duty cycle of the backlight module corresponding to degree, by described switch module and described
Resistance unit controls the brightness of each LED unit of described backlight module.
In the third aspect, the embodiment of the present invention provides a kind of television set.Described television set includes:
Display module, including several elementary areas；
Backlight module, is arranged at the underface of described display module, and described backlight module includes
Several LED unit, elementary area one_to_one corresponding described in LED unit described in one and；
System on Chip/SoC, is used for receiving video signal, parses full-screen image ash from described video signal
Degree and cell picture gray scale, and according to pre-building the full frame of full-screen image gray scale and backlight module
Inverse relation between current peak, calculates the backlight module corresponding to described full-screen image gray scale
Full frame current peak, and mono-according to the LED pre-building cell picture gray scale and backlight module
Proportional relation between elementary current dutycycle, calculates the backlight corresponding to described cell picture gray scale
The LED unit current duty cycle of module；
Region backlight control circuit, respectively with each of described System on Chip/SoC and described backlight module
LED unit connects, for the backlight corresponding to described full-screen image gray scale calculated described in basis
The full frame current peak of module and the described backlight corresponding to described cell picture gray scale calculated
The LED unit current duty cycle of module, controls the brightness of each LED unit of described backlight module；
Power module, for the most described display module, described backlight module, described system core
Sheet and described region backlight control circuit provide power supply.
Alternatively, described region backlight control circuit includes:
LED drive power, the one end with each LED unit of described backlight module connects respectively,
For providing power supply for each LED unit described；
LED drive circuit, mono-with each LED of described System on Chip/SoC and described backlight module respectively
The other end of unit connects, for the back of the body corresponding to described full-screen image gray scale calculated described in basis
The full frame current peak of light module and the described back of the body corresponding to described cell picture gray scale calculated
The LED unit current duty cycle of light module, controls each LED unit bright of described backlight module
Degree.
Alternatively, described LED drive circuit includes:
Switch module, including several metal-oxide-semiconductors, LED described in the drain electrode of metal-oxide-semiconductor described in one and
The other end of unit connects；
Resistance unit, including several resistance, metal-oxide-semiconductor described in one end of resistance described in one and
Source electrode connects, the other end ground connection of resistance described in one；
Backlight lamp control device, described backlight lamp control device and described System on Chip/SoC connect；Described backlight
Lamp controller include several control passage, described in one control passage respectively with metal-oxide-semiconductor described in
Grid and source electrode connect；Described backlight lamp control device according to described in calculate described full-screen image ash
The full frame current peak of the backlight module corresponding to degree and the described described cell picture ash calculated
The LED unit current duty cycle of the backlight module corresponding to degree, by described switch module and described
Resistance unit controls the brightness of each LED unit of described backlight module.
In fourth aspect, the embodiment of the present invention provides a kind of local dimming method.Described local dimming
Method includes:
Receive video signal；
Full-screen image gray scale and cell picture gray scale is parsed from described video signal；
Anti-according to pre-build between full-screen image gray scale and the full frame current peak of backlight module
Ratio relation, calculates the full frame current peak of backlight module corresponding to described full-screen image gray scale；
According to pre-building between the LED unit current duty cycle of cell picture gray scale and backlight module
Proportional relation, calculate the LED unit electricity of backlight module corresponding to described cell picture gray scale
Stream dutycycle；
The full frame electricity of the backlight module corresponding to described full-screen image gray scale calculated described in output
The LED unit electric current of the backlight module corresponding to described cell picture gray scale flowing peak value and calculate
Dutycycle so that region backlight control circuit according to described in the described full-screen image gray scale institute that calculates
The full frame current peak of corresponding backlight module and the described described cell picture gray scale institute calculated
The LED unit current duty cycle of corresponding backlight module, controls each LED unit of backlight module
Brightness.
In each embodiment of the present invention, by video signal being parsed full-screen image gray scale and list
Unit's gradation of image, according to the full frame current peak of the backlight module of this full-screen image gray scale output correspondence
Value, according to the LED unit current duty cycle of the backlight module of this cell picture gray scale output correspondence,
Make each different backlight area of backlight module simultaneously at same full frame current peak and different LED
Under cell current dutycycle, present different brightness, thus promote image peak brightness and contrast,
Also reduce Overall Power Consumption simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural principle block diagram of a kind of backlight that the embodiment of the present invention one provides；
Fig. 1 a is after a kind of System on Chip/SoC that the embodiment of the present invention one provides resolves according to video signal
The schematic diagram of full-screen image gray scale；
Fig. 1 b is between a kind of back facet current and the full-screen image gray scale that the embodiment of the present invention one provides
Curve synoptic diagram；
Fig. 1 c is a kind of LED unit current duty cycle and the unit figure of the embodiment of the present invention one offer
As the curve synoptic diagram between gray scale；
A kind of GTG and the mapping of backlight Gamma that Fig. 1 d provides for the embodiment of the present invention one represent
It is intended to；
A kind of signal of the design principle chart of the backlight that Fig. 1 e provides for the embodiment of the present invention one
Figure；
Showing of the another kind of design principle chart of the backlight that Fig. 1 f provides for the embodiment of the present invention one
It is intended to；
Fig. 2 is the structural principle block diagram of a kind of backlight that the embodiment of the present invention two provides；
Fig. 3 is the structural representation of a kind of display floater that the embodiment of the present invention three provides；
Fig. 4 is the structural representation of a kind of television set that the embodiment of the present invention four provides；
Fig. 5 is the schematic flow sheet of a kind of local dimming method that the embodiment of the present invention five provides.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with attached
Figure and embodiment, be further elaborated to the present invention.Should be appreciated that described herein
Specific embodiment only in order to explain the present invention, is not intended to limit the present invention.
Some vocabulary is employed to censure specific element in the middle of specification and claims.Institute
Belong to those skilled in the art it is to be appreciated that hardware manufacturer may be with different noun names
Same element.This specification and claims book is not using the difference of title as distinguishing element
Mode, but using element difference functionally as the criterion distinguished.
The backlight module that embodiment provides is for directly-down liquid crystal display screen.At some directly-down liquid crystals
In display screen, backlight module is arranged at the underface of display module.Display module includes several figures
As unit, correspondingly, backlight module includes several LED unit, each elementary area and each
LED unit one_to_one corresponding.Wherein, each elementary area all defines certain viewing area, and
Including several pixel cells.Therefore, by regulating current peak and the duty of each LED unit
Ratio, to change the brightness of each LED unit of backlight module, and then changes display each district of picture
The brightness in territory, thus the contrast of motor current peak value and brightness, and also complete machine merit can be reduced
Consumption.
Embodiment one
Refer to the structural principle that Fig. 1, Fig. 1 are a kind of backlights that the embodiment of the present invention one provides
Block diagram.As it is shown in figure 1, this backlight includes backlight module 11, System on Chip/SoC 12 and region
Backlight control circuit 13.
In the present embodiment, backlight module 11 includes several LED unit.Each LED unit
Line up array.Further, each LED unit includes N number of LED, and the first LED is just
Pole and external power source connect, and the negative pole of the first LED and the positive pole of the second LED connect, and second
The negative pole of LED and the positive pole of the 3rd LED connect, the like, the LED of N-1
The positive pole of the LED of negative pole and N connects, the negative pole of the LED of N and region backlight control
Circuit 13 connects.In the present embodiment, designer determines the number of LED unit according to operation purpose
The quantity of the LED in amount and each LED unit.
In certain embodiments, backlight module 11 could be included for carrying leading of LED unit
Tabula rasa and other auxiliary equipment.Those skilled in the art it should be understood that described in the present embodiment
Backlight module should include but not limited to LED unit and light guide plate, it is also possible to includes that other auxiliary set
Standby, in order to the content that technical field personnel instruct and guide in conjunction with the embodiments realizes the purpose of the present invention.
In the present embodiment, System on Chip/SoC 12 (System on Chip) is integrated on chip mainboard.
Designer is according to the performance of product, the electrical functions module on unrestricted choice chip mainboard.Such as,
On a television set, this chip mainboard integration system chip, HDMI (High
Definition Multimedia Interface, HDMI), USB interface (Video Graphics
Array), domestic audio-visual devices transmission port (AV), WIFI module (wifi module), indigo plant
Tooth module (Bluetooth module), USB (universal serial bus) (Universal Serial Bus,
USB interface), voice module, Anneta module, Serial Peripheral Interface (SPI) (Serial Peripheral
Interface, SPI) and etc..
In the present embodiment, System on Chip/SoC 12 has video signal parses full-screen image gray scale
With the functional attributes of cell picture gray scale, those skilled in the art can be instructed and guided in conjunction with the embodiments
The all optional System on Chip/SoC being suitable for of content, to realize the purpose of the present invention.Further, system
Chip 12 is to be understood that and at least includes storage medium and performance element, and wherein, storage medium stores
Have owing to resolving full-screen image gray scale and a program of cell picture gray scale or multiple program, solve
During analysis, performance element obtains full frame from storage medium reading program to realize resolving video signal
Gradation of image and cell picture gray scale.Wherein, storage medium can by any kind of volatibility or
Non-volatile memory device or combinations thereof realize, such as SRAM (Static Random Access
Memory, static RAM), EEPROM (Electrically-Erasable
Programmable Read-Only Memory, Electrically Erasable Read Only Memory),
(Erasable Programmable Read Only Memory, erasable programmable is read-only to be deposited EPROM
Reservoir), PROM (Programmable Read-Only Memory, programmable read only memory),
ROM (Read-Only Memory, read only memory), magnetic memory, flash memory, disk
Or CD.Performance element can be processor, and this processor can be general processor, numeral letter
Number processor (DSP), special IC (ASIC), field programmable gate array (FPGA) or its
Its PLD, discrete gate or transistor logic, discrete nextport hardware component NextPort or these portions
Any combination of part.Further, processor herein can be any conventional processors, controller,
Microcontroller or state machine.Processor can also be implemented as the combination of calculating equipment, such as, DSP
Combination with microprocessor, multi-microprocessor, one or more microprocessor combine DSP core,
Or any other this configuration.
In the present embodiment, video signal includes VGA signal, HDMI signal, AV signal, warp
The video signal that the video signal transmitted by network and other signal source produce.
In the present embodiment, full-screen image gray scale is maximum by full-screen image average gray and full-screen image
Weighting U=β * Umax+ (8-β) the * Umean of gray scale gets.Wherein, β value 0～8, Umax
For full-screen image maximum gray scale, Umean is full-screen image average gray.Cell picture gray scale is by list
Unit's image averaging gray scale and weighting Sx=α * Smax+ (8-α) the * Smean of elementary area maximum gray scale
Get.Wherein, α value 0～8, Smax is elementary area maximum gray scale, and Smean is unit figure
As average gray, Sx is elementary area.
In the present embodiment, System on Chip/SoC 12 is according to the video signal received, from video signal
Parse full-screen image gray scale and cell picture gray scale.System on Chip/SoC 12 is complete according to pre-build
Inverse relation between screen image gray scale and the full frame current peak of backlight module, calculates and resolves
The full frame current peak of the backlight module corresponding to full-screen image gray scale arrived.In the present embodiment,
The signal driving each LED unit is pulse width modulating signal (Pulse Width
Modulation, PWM).Full frame current peak is the back facet current driving each LED unit luminous,
And the full frame current peak of each LED unit is equal at synchronization.
Refer to Fig. 1 a, Fig. 1 a be the embodiment of the present invention one provide a kind of System on Chip/SoC according to regarding
Frequently the schematic diagram of the full-screen image gray scale after signal resolution.As shown in Figure 1a, white edge is in black surround
The percentage ratio that size percentage ratio is full-screen image gray scale.Such as, the percentage ratio of the first white edge 1a1
Being 4%, the percentage ratio of the second white edge 1a2 is 10%.
In the present embodiment, in order to calculate the full frame electric current corresponding to the full-screen image gray scale parsed
Peak value, needs to pre-build the pass between full-screen image gray scale and the full frame current peak of backlight module
System, wherein, this relation is inverse relation.Refer to Fig. 1 b, Fig. 1 b is the embodiment of the present invention one
Curve synoptic diagram between a kind of back facet current and the full-screen image gray scale that provide.As shown in Figure 1 b,
Full-screen image gray scale is the highest, and full frame current peak is the least；Full-screen image gray scale is the lowest, full frame electric current
Peak value is the biggest.In Figure 1b, designer is with watt level for limiting benchmark, according to operation purpose,
21 points, wherein these 21 points are preset between 0% to 100% full-screen image tonal range
It is respectively described the relation between back facet current and full-screen image gray scale.Such as full-screen image gray scale 1%
Corresponding back facet current 450mA, 10% corresponding 450mA, 25% corresponding 430mA, 30% corresponding 330mA,
100% corresponding 180mA.Certainly, those skilled in the art it should be understood that at 0% to 100% full frame figure
As, between tonal range, designer can preset according to operation purpose and other restrictive condition
Other number point of destination, is not limited only to 21 points.Further, as long as anyone follows
Relation between full-screen image gray scale and the full frame current peak of backlight module is setting of inverse relation
Meter principle, and combine the instruction and guide of the embodiment of the present invention, no matter using which kind of variation pattern, it should
When falling under the scope of the present invention.
In the present embodiment, System on Chip/SoC 12 parses full-screen image gray scale according to video signal,
Then the full frame current peak of correspondence is calculated according to this full-screen image densitometer.Concrete, if should
Full-screen image gray scale is full-screen image gray scale set in advance, then the full-screen image gray scale pair parsed
Answer back facet current value set in advance, the most full frame current peak.If this full-screen image gray scale is not
Full-screen image gray scale set in advance, the full-screen image gray scale i.e. parsed falls into set in advance two
Between individual full-screen image gray scale, then System on Chip/SoC 12 is according to these two full-screen image set in advance
Gray scale sets the linear function of a slope determined by these two full-screen image gray scales, the most again
According to the full-screen image gray scale being resolved to, calculate full frame current peak.Such as, preset
Two values (25%, 430) and (30%, 330), it is assumed that the full-screen image gray scale being resolved to is
28%, then according to (430-330)/(30%-25%)=2000, and according to functional relationship,
It is 290mA to the full frame current peak corresponding to 28% full frame gray level image.In fact, real at some
Execute example, it is also possible to use other mathematic calculation constantly to approach, to obtain accurate full frame electricity
Stream peak value.Those skilled in the art it should be understood that the embodiment that the present embodiment is instructed and guided, only
It is one of which calculation, as long as other calculation is based on suggested by the embodiment of the present invention
Under design, within other conversion should fall into the scope of protection of the invention.
In the present embodiment, in order to calculate the LED unit corresponding to the cell picture gray scale parsed
Current duty cycle, needs to pre-build between cell picture gray scale and LED unit current duty cycle
Relation, wherein, this relation is proportional relation.Refer to Fig. 1 c, Fig. 1 c is the embodiment of the present invention
Curve synoptic diagram between one a kind of LED unit current duty cycle and the cell picture gray scale provided.
As illustrated in figure 1 c, cell picture gray scale is the highest, and LED unit current duty cycle is the biggest；Cell picture
Gray scale is the lowest, and LED unit current duty cycle is the least.In the present embodiment, each LED unit electricity
As stream dutycycle according to cell picture gray scale can be, it is also possible to be different.Refer to Fig. 1 d,
A kind of GTG that Fig. 1 d provides for the embodiment of the present invention one and the mapping table schematic diagram of backlight Gamma.
As shown in figs. lc and ld, designer, according to grey-scale range (0～255), presets backlight scope
(0～255) and the corresponding relation of dutycycle (0%～100%).The most such as, 10% cell picture ash
Spend corresponding 10% current duty cycle, corresponding 20% current duty cycle of 20% cell picture gray scale.Certainly,
Those skilled in the art it should be understood that between 0% to 100% cell picture tonal range, i.e. ash
Between order range (0～255) scope, designer can according to operation purpose and other restrictive condition
To preset other number point of destination, it is not limited only to point described above.Further,
As long as anyone follows the relation between cell picture gray scale and LED unit current duty cycle is direct ratio
The design principle of relation, and combine the instruction and guide of the embodiment of the present invention, no matter use which kind of change side
Formula, it should fall under the scope of the present invention.
In the present embodiment, System on Chip/SoC 12 parses cell picture gray scale according to video signal,
Then the LED unit current duty cycle of correspondence is calculated according to this cell picture densitometer.Concrete,
If the corresponding cell picture gray scale set in advance of this cell picture gray scale, then the unit figure parsed
As the corresponding LED unit current duty cycle set in advance of gray scale.If this cell picture gray scale is not
Falling into cell picture gray scale set in advance, the cell picture gray scale after i.e. resolving falls into and presets
Two cell picture gray scales between, then System on Chip/SoC 12 is according to these two unit set in advance
Gradation of image sets the linear function of a slope determined by these two cell picture gray scales, so
After further according to the cell picture gray scale being resolved to, calculate LED unit current duty cycle.
In the present embodiment, region backlight control circuit 13 respectively with System on Chip/SoC 12 and backlight mould
Each LED unit of group 11 connects.Region backlight control circuit 13 is according to the full frame figure calculated
The full frame current peak of the backlight module as corresponding to gray scale and the cell picture gray scale institute calculated
The LED unit current duty cycle of corresponding backlight module, controls each LED unit of backlight module
Brightness.Such as, when in display image frame, the brightness of first area is higher, second area
When brightness is dark, System on Chip/SoC 12, according to above-mentioned computational methods, calculates first area and second
The full frame current peak corresponding to full frame gray scale intensities that region is total, further, also calculates
First LED unit current duty cycle of first area and the second LED unit electric current of second area
Dutycycle, wherein, the first LED unit current duty cycle of first area is more than the of second area
Two LED unit current duty cycle.Region backlight control circuit 13 is according to full frame current peak and
One LED unit current duty cycle, makes the brightness of the display image frame of first area be promoted.
Further, region backlight control circuit 13 accounts for according to full frame current peak and the second LED unit electric current
Empty ratio, reduces the brightness of the display image frame of second area.Therefore, the method, its energy are used
Enough improve image peak contrast and brightness.
Please also refer to Fig. 1 e and Fig. 1 f, the backlight that Fig. 1 e provides for the embodiment of the present invention one
A kind of schematic diagram of design principle chart, the backlight that Fig. 1 f provides for the embodiment of the present invention one
The schematic diagram of another kind of design principle chart.Herein, in full-screen image gray scale, β=6 are set.
In cell picture gray scale, α=6 are set.As illustrated in figs. 1 e and 1f, system power is curve
Change, be fixed form relative to the system power of prior art, the backlight that the present embodiment provides
Source can promote image peak contrast and brightness neatly, and reduces Overall Power Consumption.Such as,
When full-screen image gray scale is 15%, default back facet current is 450, i.e. presets full frame current peak
Being 450, test back facet current is 447 (errors that loss causes), full frame current peak now
Corresponding brightness is 880nit, and complete machine power is only 262W.Review prior art, if
Not motor current, 880nit to be reached, then the design power of complete machine at least needs more than 830W,
I.e. (3.5x450x448)/0.85=830W.Wherein, 448 subregions are the LED unit of backlight module
Total number of partitions, the voltage of each subregion is 3.5V, 450mA be preset back facet current, 0.85 is
Conversion efficiency.
Implement two
Refer to the structural principle that Fig. 2, Fig. 2 are a kind of backlights that the embodiment of the present invention two provides
Block diagram.As in figure 2 it is shown, this backlight includes backlight module 21, System on Chip/SoC 22 and region
Backlight control circuit.
Backlight module 21 includes several LED unit 211.System on Chip/SoC 22 is used for receiving video
Signal, and parse full-screen image gray scale and cell picture gray scale from video signal.System on Chip/SoC
22 according to pre-building the inverse ratio between full-screen image gray scale and the full frame current peak of backlight module
Relation, calculates the full frame current peak of backlight module corresponding to full-screen image gray scale.System core
Sheet 22 according to pre-build cell picture gray scale and backlight module LED unit current duty cycle it
Between proportional relation, calculate the LED unit electric current of backlight module corresponding to cell picture gray scale
Dutycycle.
Region backlight control circuit for respectively with each LED unit of System on Chip/SoC and backlight module
Connect.Region backlight control circuit is according to the backlight module corresponding to the full-screen image gray scale calculated
Full frame current peak and the LED of the backlight module corresponding to described cell picture gray scale that calculates
Cell current dutycycle, controls the brightness of each LED unit of backlight module.
Further, region backlight control circuit includes that LED drive power 231 and LED drives electricity
Road, LED drive power 231 for respectively with the one of each LED unit 211 of backlight module 21
End connects, and provides power supply for each LED unit 211.Each LED unit 211 lines up array.
Further, each LED unit 211 includes N number of LED, the positive pole of the first LED and LED
Driving power supply 231 to connect, the negative pole of the first LED and the positive pole of the second LED connect, and second
The negative pole of LED and the positive pole of the 3rd LED connect, the like, the LED of N-1
The positive pole of the LED of negative pole and N connects, the negative pole of the LED of N and LED drive circuit
Connect.In the present embodiment, designer determines the quantity of LED unit and every according to operation purpose
The quantity of the LED in individual LED unit.
LED drive circuit respectively with each LED unit 211 of System on Chip/SoC 22 and backlight module 21
The other end connect.Complete according to the backlight module 21 corresponding to the full-screen image gray scale calculated
The LED unit of the backlight module 21 corresponding to cell picture gray scale shielding current peak and calculate
Current duty cycle, controls the brightness of each LED unit of backlight module 21.
Further, LED drive circuit includes switching module, resistance unit and backlight lamp control
Device 232C.Switch module includes several metal-oxide-semiconductors 232A, the drain electrode of each metal-oxide-semiconductor 232A and
The other end of each LED unit 211 connects.Resistance unit includes several resistance 232B, each
One end of resistance 232B and the source electrode of each metal-oxide-semiconductor 232A connect, and each resistance 232B's is another
One end ground connection.
In the present embodiment, backlight lamp control device 232C and System on Chip/SoC 22 connect.Wherein, the back of the body
Light lamp controller include 16 control passages, each control passage respectively with each metal-oxide-semiconductor 232A
Grid and source electrode connect.System on Chip/SoC 22, will by SPI interface within each field frequency cycle
The full frame current peak of the backlight module corresponding to full-screen image gray scale calculated and calculating
The data of the LED unit current duty cycle of the backlight module corresponding to cell picture gray scale are sent to the back of the body
Light lamp controller 232C.Backlight lamp control device 232C is within the next field frequency cycle, according to calculating
The full frame current peak of the backlight module corresponding to full-screen image gray scale gone out and the unit calculated
The LED unit current duty cycle of the backlight module corresponding to gradation of image, by switch module and electricity
Resistance unit controls the brightness of each LED unit of described backlight module.Such as, backlight lamp control device
232C is by the first control passage 232C1, on the one hand, by resistance 232B lifting metal-oxide-semiconductor 232A
The voltage of source electrode, on the other hand, by controlling metal-oxide-semiconductor 232A grid, thus realizes according to meter
The full frame current peak of the backlight module corresponding to full-screen image gray scale calculated and the list calculated
The LED unit current duty cycle of unit's backlight module corresponding to gradation of image, to control LED unit
The brightness of 211, and realize controlling the contrast of display picture further.
In each embodiment above-mentioned, by video signal being parsed full-screen image gray scale and unit
Gradation of image, according to the full frame current peak of the backlight module of this full-screen image gray scale output correspondence,
The LED unit current duty cycle of the backlight module according to this cell picture gray scale output correspondence, makes the back of the body
Each different backlight area of light module is simultaneously in same full frame current peak and different LED unit
Under current duty cycle, present different brightness, thus promote image peak brightness and contrast, with
Time also reduce Overall Power Consumption.
Embodiment three
Refer to the structure that Fig. 3, Fig. 3 are a kind of display floaters that the embodiment of the present invention three provides show
It is intended to.As it is shown on figure 3, this display floater includes showing module 31, backlight module 32, system
Chip 33 and region backlight control circuit 34.
In this example it is shown that module 31 includes several elementary areas.Backlight module 32 sets
It is placed in the underface of display module 31, and backlight module 32 includes several LED unit, often
Individual LED unit and each elementary area one_to_one corresponding.Display module can be liquid crystal display mode group.
In the present embodiment, System on Chip/SoC 33 is used for receiving video signal, and from video signal
Parse full-screen image gray scale and cell picture gray scale.System on Chip/SoC 33 is full frame according to pre-building
Inverse relation between gradation of image and the full frame current peak of backlight module, calculates full-screen image
The full frame current peak of the backlight module corresponding to gray scale.System on Chip/SoC 33 is according to pre-building list
Proportional relation between unit's gradation of image and the LED unit current duty cycle of backlight module, calculates
The LED unit current duty cycle of the backlight module corresponding to cell picture gray scale.
In the present embodiment, region backlight control circuit 34 for respectively with System on Chip/SoC 33 and the back of the body
Each LED unit of light module 32 connects.Region backlight control circuit 34 is complete according to calculate
The full frame current peak of the backlight module corresponding to screen image gray scale and the cell picture ash calculated
The LED unit current duty cycle of the backlight module corresponding to degree, control backlight module 32 each
The brightness of LED unit.
Further, region backlight control circuit 34 includes that LED drive power and LED drive electricity
Road, LED drive power connects for one end with each LED unit of backlight module respectively, for
Each LED unit described provides power supply.LED drive circuit for respectively with System on Chip/SoC and backlight
The other end of each LED unit of module connects, corresponding to the full-screen image gray scale calculated
The full frame current peak of backlight module and the described back of the body corresponding to cell picture gray scale calculated
The LED unit current duty cycle of light module, controls the brightness of each LED unit of backlight module.
Further, LED drive circuit includes switching module, resistance unit and backlight lamp control
Device.Switch module includes several metal-oxide-semiconductors, the drain electrode of each metal-oxide-semiconductor and each LED unit
The other end connects.Resistance unit includes several resistance, one end of each resistance and each metal-oxide-semiconductor
Source electrode connect, the other end ground connection of each resistance.Backlight lamp control device and System on Chip/SoC connect.
Backlight lamp control device include several control passage, each control passage respectively with each metal-oxide-semiconductor
Grid and source electrode connect.Backlight lamp control device is according to the back of the body corresponding to the full-screen image gray scale calculated
The full frame current peak of light module and the backlight mould corresponding to described cell picture gray scale calculated
The LED unit current duty cycle of group, controls backlight module by switch module and described resistance unit
The brightness of each LED unit.
In the present embodiment, by video signal being parsed full-screen image gray scale and cell picture ash
Degree, according to the full frame current peak of the backlight module of this full-screen image gray scale output correspondence, according to this
The LED unit current duty cycle of the backlight module that the output of cell picture gray scale is corresponding, makes backlight module
Each different backlight area accounts at same full frame current peak and different LED unit electric currents simultaneously
Under empty ratio, present different brightness, thus promote image peak brightness and contrast, also drop simultaneously
Low Overall Power Consumption.
Embodiment four
Refer to the structural representation that Fig. 4, Fig. 4 are a kind of television sets that the embodiment of the present invention four provides
Figure.As shown in Figure 4, this television set includes showing module 41, backlight module 42, System on Chip/SoC
43, region backlight control circuit 44 and power module 45.Display module 41 includes several figures
As unit.
In the present embodiment, backlight module 42 is arranged at the underface of display module 41, and carries on the back
Light module 42 includes several LED unit, each LED unit and each elementary area one a pair
Should.
In the present embodiment, System on Chip/SoC 43 is used for receiving video signal, and from video signal
Parse full-screen image gray scale and cell picture gray scale.System on Chip/SoC 43 is full frame according to pre-building
Inverse relation between gradation of image and the full frame current peak of backlight module, calculates described full frame
The full frame current peak of the backlight module corresponding to gradation of image.System on Chip/SoC 43 is according to building in advance
Vertical proportional relation between cell picture gray scale and the LED unit current duty cycle of backlight module, meter
The LED unit current duty cycle of the backlight module corresponding to calculated unit gradation of image.
In the present embodiment, region backlight control circuit 44 for respectively with System on Chip/SoC 43 and the back of the body
Each LED unit of light module 42 connects.Region backlight control circuit 44 is complete according to calculate
The full frame current peak of the backlight module corresponding to screen image gray scale and the described unit figure calculated
As the LED unit current duty cycle of backlight module corresponding to gray scale, control each of backlight module
The brightness of LED unit.
In the present embodiment, power module 45 for be respectively display module 41, backlight module 42,
System on Chip/SoC 43 and region backlight control circuit 44 provide power supply.Power module 45 can wrap
Include power-supply management system, one or more power supplys, and other with generate for television set, manage and point
The assembly that distribution power is associated.
Further, region backlight control circuit 44 includes that LED drive power and LED drive electricity
Road, LED drive power connects for one end with each LED unit of backlight module respectively, for
Each LED unit described provides power supply.LED drive circuit for respectively with System on Chip/SoC and backlight
The other end of each LED unit of module connects, corresponding to the full-screen image gray scale calculated
The full frame current peak of backlight module and the described back of the body corresponding to cell picture gray scale calculated
The LED unit current duty cycle of light module, controls the brightness of each LED unit of backlight module.
Further, LED drive circuit includes switching module, resistance unit and backlight lamp control
Device.Switch module includes several metal-oxide-semiconductors, the drain electrode of each metal-oxide-semiconductor and each LED unit
The other end connects.Resistance unit includes several resistance, one end of each resistance and each metal-oxide-semiconductor
Source electrode connect, the other end ground connection of each resistance.Backlight lamp control device and System on Chip/SoC connect.
Backlight lamp control device include several control passage, each control passage respectively with each metal-oxide-semiconductor
Grid and source electrode connect.Backlight lamp control device is according to the back of the body corresponding to the full-screen image gray scale calculated
The full frame current peak of light module and the backlight mould corresponding to described cell picture gray scale calculated
The LED unit current duty cycle of group, controls backlight module by switch module and described resistance unit
The brightness of each LED unit.
In the present embodiment, by video signal being parsed full-screen image gray scale and cell picture ash
Degree, according to the full frame current peak of the backlight module of this full-screen image gray scale output correspondence, according to this
The LED unit current duty cycle of the backlight module that the output of cell picture gray scale is corresponding, makes backlight module
Each different backlight area accounts at same full frame current peak and different LED unit electric currents simultaneously
Under empty ratio, present different brightness, thus promote image peak brightness and contrast, also drop simultaneously
Low Overall Power Consumption.
Embodiment five
Refer to the stream that Fig. 5, Fig. 5 are a kind of local dimming methods that the embodiment of the present invention five provides
Journey schematic diagram.As it is shown in figure 5, the method includes:
S51, reception video signal；
In this step S51, System on Chip/SoC receives video signal.Video signal include VGA signal,
HDMI signal, AV signal, the video signal transmitted via network and other signal source produce
Video signal.
S52, parse full-screen image gray scale and cell picture gray scale from video signal；
In this step S52, System on Chip/SoC parses full-screen image gray scale and unit from video signal
Gradation of image.
S53, basis pre-build between full-screen image gray scale and the full frame current peak of backlight module
Inverse relation, calculate the full frame current peak of backlight module corresponding to full-screen image gray scale；
In this step S53, System on Chip/SoC is according to pre-building full-screen image gray scale and backlight module
Full frame current peak between inverse relation, calculate the backlight mould corresponding to full-screen image gray scale
The full frame current peak of group.
S54, basis pre-build the LED unit electric current duty of cell picture gray scale and backlight module
Proportional relation between Bi, calculates the LED unit of backlight module corresponding to cell picture gray scale
Current duty cycle；
In this step S54, System on Chip/SoC is according to pre-building cell picture gray scale and backlight module
LED unit current duty cycle between proportional relation, calculate corresponding to cell picture gray scale
The LED unit current duty cycle of backlight module.
The full frame current peak of the backlight module corresponding to full-screen image gray scale that S55, output calculate
Value and the LED unit current duty cycle of the backlight module corresponding to cell picture gray scale calculated.
In this step S55, System on Chip/SoC exports the back of the body corresponding to full-screen image gray scale calculated
The full frame current peak of light module and the backlight module corresponding to cell picture gray scale calculated
LED unit current duty cycle, so that region backlight control circuit is according to the full-screen image ash calculated
The full frame current peak of the backlight module corresponding to degree and the described cell picture gray scale institute calculated
The LED unit current duty cycle of corresponding backlight module, controls each LED unit of backlight module
Brightness.
In the present embodiment, by video signal being parsed full-screen image gray scale and cell picture ash
Degree, according to the full frame current peak of the backlight module of this full-screen image gray scale output correspondence, according to this
The LED unit current duty cycle of the backlight module that the output of cell picture gray scale is corresponding, makes backlight module
Each different backlight area accounts at same full frame current peak and different LED unit electric currents simultaneously
Under empty ratio, present different brightness, thus promote image peak brightness and contrast, also drop simultaneously
Low Overall Power Consumption.
The foregoing is only embodiments of the present invention, not thereby limit the patent model of the present invention
Enclosing, every equivalent structure utilizing description of the invention and accompanying drawing content to be made or equivalence flow process become
Change, or be directly or indirectly used in other relevant technical fields, be the most in like manner included in the present invention's
In scope of patent protection.
Claims (10)
1. a backlight, it is characterised in that including:
Backlight module, including several LED unit；
System on Chip/SoC, is used for receiving video signal, parses full-screen image ash from described video signal
Degree and cell picture gray scale, and according to pre-building the full frame of full-screen image gray scale and backlight module
Inverse relation between current peak, calculates the backlight module corresponding to described full-screen image gray scale
Full frame current peak, and mono-according to the LED pre-building cell picture gray scale and backlight module
Proportional relation between elementary current dutycycle, calculates the backlight corresponding to described cell picture gray scale
The LED unit current duty cycle of module；
Region backlight control circuit, respectively with each of described System on Chip/SoC and described backlight module
LED unit connects, for the backlight corresponding to described full-screen image gray scale calculated described in basis
The full frame current peak of module and the described backlight corresponding to described cell picture gray scale calculated
The LED unit current duty cycle of module, controls the brightness of each LED unit of described backlight module.
Backlight the most according to claim 1, it is characterised in that described region backlight control
Circuit processed includes:
LED drive power, the one end with each LED unit of described backlight module connects respectively,
For providing power supply for each LED unit described；
LED drive circuit, mono-with each LED of described System on Chip/SoC and described backlight module respectively
The other end of unit connects, for the back of the body corresponding to described full-screen image gray scale calculated described in basis
The full frame current peak of light module and the described back of the body corresponding to described cell picture gray scale calculated
The LED unit current duty cycle of light module, controls each LED unit bright of described backlight module
Degree.
Backlight the most according to claim 2, it is characterised in that described LED drives electricity
Road includes:
Switch module, including several metal-oxide-semiconductors, LED described in the drain electrode of metal-oxide-semiconductor described in one and
The other end of unit connects；
Resistance unit, including several resistance, metal-oxide-semiconductor described in one end of resistance described in one and
Source electrode connects, the other end ground connection of resistance described in one；
Backlight lamp control device, described backlight lamp control device and described System on Chip/SoC connect；Described backlight
Lamp controller include several control passage, described in one control passage respectively with metal-oxide-semiconductor described in
Grid and source electrode connect；Described backlight lamp control device according to described in calculate described full-screen image ash
The full frame current peak of the backlight module corresponding to degree and the described described cell picture ash calculated
The LED unit current duty cycle of the backlight module corresponding to degree, by described switch module and described
Resistance unit controls the brightness of each LED unit of described backlight module.
4. a display floater, it is characterised in that including:
Display module, including several elementary areas；
Backlight module, is arranged at the underface of described display module, and described backlight module includes
Several LED unit, elementary area one_to_one corresponding described in LED unit described in one and；
System on Chip/SoC, is used for receiving video signal, parses full-screen image ash from described video signal
Degree and cell picture gray scale, and according to pre-building the full frame of full-screen image gray scale and backlight module
Inverse relation between current peak, calculates the backlight module corresponding to described full-screen image gray scale
Full frame current peak, and mono-according to the LED pre-building cell picture gray scale and backlight module
Proportional relation between elementary current dutycycle, calculates the backlight corresponding to described cell picture gray scale
The LED unit current duty cycle of module；
Region backlight control circuit, respectively with each of described System on Chip/SoC and described backlight module
LED unit connects, for the backlight corresponding to described full-screen image gray scale calculated described in basis
The full frame current peak of module and the described backlight corresponding to described cell picture gray scale calculated
The LED unit current duty cycle of module, controls the brightness of each LED unit of described backlight module.
Display floater the most according to claim 4, it is characterised in that described region backlight
Control circuit includes:
LED drive power, the one end with each LED unit of described backlight module connects respectively,
For providing power supply for each LED unit described；
LED drive circuit, mono-with each LED of described System on Chip/SoC and described backlight module respectively
The other end of unit connects, for the back of the body corresponding to described full-screen image gray scale calculated described in basis
The full frame current peak of light module and the described back of the body corresponding to described cell picture gray scale calculated
The LED unit current duty cycle of light module, controls each LED unit bright of described backlight module
Degree.
Display floater the most according to claim 5, it is characterised in that described LED drives
Circuit includes:
Switch module, including several metal-oxide-semiconductors, LED described in the drain electrode of metal-oxide-semiconductor described in one and
The other end of unit connects；
Resistance unit, including several resistance, metal-oxide-semiconductor described in one end of resistance described in one and
Source electrode connects, the other end ground connection of resistance described in one；
Backlight lamp control device, described backlight lamp control device and described System on Chip/SoC connect；Described backlight
Lamp controller include several control passage, described in one control passage respectively with metal-oxide-semiconductor described in
Grid and source electrode connect；Described backlight lamp control device according to described in calculate described full-screen image ash
The full frame current peak of the backlight module corresponding to degree and the described described cell picture ash calculated
The LED unit current duty cycle of the backlight module corresponding to degree, by described switch module and described
Resistance unit controls the brightness of each LED unit of described backlight module.
7. a television set, it is characterised in that including:
Display module, including several elementary areas；
Backlight module, is arranged at the underface of described display module, and described backlight module includes
Several LED unit, elementary area one_to_one corresponding described in LED unit described in one and；
System on Chip/SoC, is used for receiving video signal, parses full-screen image ash from described video signal
Degree and cell picture gray scale, and according to pre-building the full frame of full-screen image gray scale and backlight module
Inverse relation between current peak, calculates the backlight module corresponding to described full-screen image gray scale
Full frame current peak, and mono-according to the LED pre-building cell picture gray scale and backlight module
Proportional relation between elementary current dutycycle, calculates the backlight corresponding to described cell picture gray scale
The LED unit current duty cycle of module；
Region backlight control circuit, respectively with each of described System on Chip/SoC and described backlight module
LED unit connects, for the backlight corresponding to described full-screen image gray scale calculated described in basis
The full frame current peak of module and the described backlight corresponding to described cell picture gray scale calculated
The LED unit current duty cycle of module, controls the brightness of each LED unit of described backlight module；
Power module, for the most described display module, described backlight module, described system core
Sheet and described region backlight control circuit provide power supply.
Television set the most according to claim 7, it is characterised in that described region backlight control
Circuit processed includes:
LED drive power, the one end with each LED unit of described backlight module connects respectively,
For providing power supply for each LED unit described；
LED drive circuit, mono-with each LED of described System on Chip/SoC and described backlight module respectively
The other end of unit connects, for the back of the body corresponding to described full-screen image gray scale calculated described in basis
The full frame current peak of light module and the described back of the body corresponding to described cell picture gray scale calculated
The LED unit current duty cycle of light module, controls each LED unit bright of described backlight module
Degree.
Television set the most according to claim 8, it is characterised in that described LED drives electricity
Road includes:
Switch module, including several metal-oxide-semiconductors, LED described in the drain electrode of metal-oxide-semiconductor described in one and
The other end of unit connects；
Resistance unit, including several resistance, metal-oxide-semiconductor described in one end of resistance described in one and
Source electrode connects, the other end ground connection of resistance described in one；
Backlight lamp control device, described backlight lamp control device and described System on Chip/SoC connect；Described backlight
Lamp controller include several control passage, described in one control passage respectively with metal-oxide-semiconductor described in
Grid and source electrode connect；Described backlight lamp control device according to described in calculate described full-screen image ash
The full frame current peak of the backlight module corresponding to degree and the described described cell picture ash calculated
The LED unit current duty cycle of the backlight module corresponding to degree, by described switch module and described
Resistance unit controls the brightness of each LED unit of described backlight module.
10. a local dimming method, it is characterised in that including:
Receive video signal；
Full-screen image gray scale and cell picture gray scale is parsed from described video signal；
Anti-according to pre-build between full-screen image gray scale and the full frame current peak of backlight module
Ratio relation, calculates the full frame current peak of backlight module corresponding to described full-screen image gray scale；
According to pre-building between the LED unit current duty cycle of cell picture gray scale and backlight module
Proportional relation, calculate the LED unit electricity of backlight module corresponding to described cell picture gray scale
Stream dutycycle；
The full frame electricity of the backlight module corresponding to described full-screen image gray scale calculated described in output
The LED unit electric current of the backlight module corresponding to described cell picture gray scale flowing peak value and calculate
Dutycycle so that region backlight control circuit according to described in the described full-screen image gray scale institute that calculates
The full frame current peak of corresponding backlight module and the described described cell picture gray scale institute calculated
The LED unit current duty cycle of corresponding backlight module, controls each LED unit of backlight module
Brightness.
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| CN108039152A (en) * | 2017-12-14 | 2018-05-15 | 深圳Tcl新技术有限公司 | Backlight drive control method, equipment and computer-readable recording medium |
| KR20180058037A (en) * | 2016-11-23 | 2018-05-31 | 삼성전자주식회사 | Display apparatus and driving method thereof |
| WO2019056647A1 (en) * | 2017-09-20 | 2019-03-28 | 青岛海信电器股份有限公司 | Backlight source driving method and device |
| CN111785219A (en) * | 2020-07-30 | 2020-10-16 | 惠州视维新技术有限公司 | LED driving method, display device and readable storage medium |
| CN112785984A (en) * | 2019-11-08 | 2021-05-11 | 南京航空航天大学 | LCD high-efficiency self-adaptive global backlight adjusting method for image gray level perception |
| CN113129847A (en) * | 2021-04-13 | 2021-07-16 | Tcl华星光电技术有限公司 | Backlight brightness control method and device and display equipment |
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