CN105810156B - Backlight adjusting method and backlight regulating circuit - Google Patents
Backlight adjusting method and backlight regulating circuit Download PDFInfo
- Publication number
- CN105810156B CN105810156B CN201610351213.8A CN201610351213A CN105810156B CN 105810156 B CN105810156 B CN 105810156B CN 201610351213 A CN201610351213 A CN 201610351213A CN 105810156 B CN105810156 B CN 105810156B
- Authority
- CN
- China
- Prior art keywords
- led light
- backlight
- light string
- pwm signal
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The present invention provides a kind of backlight adjusting method and backlight drive circuit, the pwm signal generated in low grayscale by pwm signal generation circuit controls backlight drive circuit adjusting first LED light string to replace with second LED light string and shines, compared with the prior art, it also only shines under synchronization there are one LED light string, the power consumption of backlight module can equally be reduced, save electricity, and due to the visual persistence effect of human eye, when first LED light string replaces with second LED light string and shines, backlight area is not in one piece bright, one piece it is dark the phenomenon that, avoid firefly effect, improve display quality.
Description
Technical field
The present invention relates to display technology field more particularly to a kind of backlight adjusting methods and backlight regulating circuit.
Background technology
With the development of display technology, the planes such as liquid crystal display (Liquid Crystal Display, LCD) display dress
Put because having many advantages, such as high image quality, power saving, fuselage is thin and has a wide range of application, and be widely used in mobile phone, TV, a number
The various consumer electrical products such as word assistant, digital camera, laptop, desktop computer, become the master in display device
Stream.
Liquid crystal display device on existing market is largely backlight liquid crystal display, including liquid crystal display panel and
Backlight module (backlight module).The operation principle of liquid crystal display panel is put among the parallel glass substrate of two panels
Liquid crystal molecule is put, two panels glass substrate centre is there are many tiny electric wire vertically and horizontally, by controlling liquid crystal whether energization
The light of backlight module is reflected generation picture by molecular changes direction.
At present, in the portable electronic product with liquid crystal display such as smart mobile phone and tablet computer, power consumption is most
Big part is exactly the backlight module of liquid crystal display, battery capacity can not it is infinitely increased under the premise of, how to reduce production
The power consumption of product, extending the continuation of the journey of product becomes strategic point problem to be solved, based on this, it is proposed that a kind of content-adaptive brightness control
(Content Adaptive Brightness Control, the CABC) technology of system, CABC technologies can be according to the figure of screen display
As adjusting the relation between the grayscale value of the image and screen backlight brightness, while screen backlight brightness is effectively reduced,
The basic display effect for keeping image.Specifically by adjusting backlight drive integrated circuit (Integrated Circuit, IC)
The duty cycle of pulse width modulation (Pulse Width Modulation, PWM) signal of reception realizes dynamic regulation backlight
Brightness achievees the purpose that reduce power consumption by reducing the duty cycle of pwm signal.
Specifically, the existing dynamic backlight control method using CABC technologies, generally includes following steps：Step 1 carries
The characteristic parameter of display picture is taken, then calculates the factor values that backlight needs adjust；Step 2 adjusts PWM letters according to factor values
Number duty cycle, and then control the brightness of backlight module, while liquid crystal compensated according to the regulatory factor value being calculated,
Accordingly adjustment shows the grayscale value of picture in itself, and final the two is input to panel progress picture and shows jointly.Further, usually
Two string LED light bars are included in backlight module, when carrying out dynamic backlight adjusting under low grayscale, can select to close wherein a string of LED
Lamp bar only lights another cluster of lamps, ornamental item, so as to reduce power consumption reach power saving purpose, but so backlight area be present with one piece it is bright and
One piece of dark brightness unevenness phenomenon, i.e. firefly effect, have seriously affected display quality.
The content of the invention
It is an object of the invention to provide a kind of backlight adjusting methods, can eliminate firefly effect during low grayscale, carry
Display quality is risen, reduces backlight power consumption.
The present invention also aims to provide a kind of backlight regulating circuit, firefly effect during low grayscale can be eliminated,
Display quality is promoted, reduces backlight power consumption.
To achieve the above object, present invention firstly provides a kind of backlight adjusting method, include the following steps：
Step 1 provides a backlight regulating circuit, including display data Acquisition Circuit and the display data Acquisition Circuit
The pwm signal generation circuit of electric connection, the backlight drive circuit being electrically connected with the pwm signal generation circuit, Yi Jiyu
The backlight that the backlight drive circuit is electrically connected；
The backlight include the first LED light string and with series-parallel second LED light string of first LED light；
The grayscale value of step 2, the current display picture of display data Acquisition Circuit acquisition, and it is transferred to pwm signal production
Raw circuit；
Step 3, the pwm signal generation circuit generate corresponding pwm signal according to the grayscale value of current display picture and give
Backlight drive circuit, the backlight drive circuit are dimmed by the pwm signal received；
Wherein, when the grayscale value of the current display picture is less than default grayscale threshold value, the pwm signal generates electricity
Pwm signal control backlight drive circuit adjusting first LED light string that road generates replaces with second LED light string to shine；
When the grayscale value of the current display picture is equal to or higher than default grayscale threshold value, the pwm signal generates
The pwm signal control backlight drive circuit that circuit generates adjusts first LED light string and the brightness of the second LED light string reduces.
First LED light string includes：First LED light of multiple series connection is equipped with interval, institute between each first LED light
Stating the second LED light string includes：Second LED light of multiple series connection, each second LED light are corresponded to respectively between each first LED light
Interval setting.
The scope of default grayscale threshold value is 0 grayscale to 15 grayscale in the step 3.
When first LED light string described in the step 3 replaces luminous with second LED light string, first LED light string
It is more than or equal to 30Hz with the glow frequency of the second LED light string.
In the step 3 when the grayscale value of the current display picture is less than default grayscale threshold value, backlight drive electricity
Road receives the backlight drive signal generated after pwm signal with the backlight drive circuit and is combined, respectively corresponding first LED light string,
The first drive waveforms and the second drive waveforms, first drive waveforms and the described second driving ripple are generated with the second LED light string
The current potential of shape is opposite.
The present invention also provides a kind of backlight regulating circuit, including：Display data Acquisition Circuit is gathered with the display data
Circuit be electrically connected pwm signal generate electricity, with the pwm signal generation circuit be electrically connected backlight drive circuit and
The backlight being electrically connected with the backlight drive circuit；
The backlight include the first LED light string and with series-parallel second LED light string of first LED light；
The grayscale value of the current display picture of display data Acquisition Circuit acquisition, and pwm signal generation circuit is transferred to,
The pwm signal generation circuit generates corresponding pwm signal to backlight drive circuit, institute according to the grayscale value of current display picture
Backlight drive circuit is stated to be dimmed by the pwm signal received；
Wherein, when the grayscale value of the current display picture is less than default grayscale threshold value, the pwm signal generates electricity
Pwm signal control backlight drive circuit adjusting first LED light string that road generates replaces with second LED light string to shine；
When the grayscale value of the current display picture is equal to or higher than default grayscale threshold value, the pwm signal generates
The pwm signal control backlight drive circuit that circuit generates adjusts first LED light string and the brightness of the second LED light string reduces.
First LED light string includes：First LED light of multiple series connection is equipped with interval, institute between each first LED light
Stating the second LED light string includes：Second LED light of multiple series connection, each second LED light are corresponded to respectively between each first LED light
Interval setting.
The scope of the default grayscale threshold value is 0 grayscale to 15 grayscale.
When first LED light string replaces luminous with second LED light string, first LED light string and the second LED light
The glow frequency of string is more than or equal to 30Hz.
When the grayscale value of the current display picture is less than default grayscale threshold value, backlight drive circuit receives PWM letters
The backlight drive signal generated after number with the backlight drive circuit is combined, and corresponds to the first LED light string and the second LED light respectively
String generates the first drive waveforms and the second drive waveforms, the current potential phase of first drive waveforms and second drive waveforms
Instead.
Beneficial effects of the present invention：The present invention provides a kind of backlight adjusting methods, are produced in low grayscale by pwm signal
The pwm signal control backlight drive circuit that raw circuit generates adjusts first LED light string and replaces hair with second LED light string
Light compared with the prior art, also only shines there are one LED light string under synchronization, can equally reduce the power consumption of backlight module,
Electricity is saved, and due to the visual persistence effect of human eye, replaces hair with second LED light string in first LED light string
The phenomenon that light time, backlight area is not in one piece bright, one piece dark, firefly effect is avoided, improves display quality.This hair
A kind of backlight regulating circuit of bright offer can eliminate firefly effect during low grayscale, promote display quality, reduce backlight work(
Consumption.
Description of the drawings
In order to be further understood that the feature of the present invention and technology contents, refer to below in connection with the detailed of the present invention
Illustrate and attached drawing, however attached drawing is only provided with reference to illustrating to use, being not used for being any limitation as the present invention.
In attached drawing,
Fig. 1 is the module map of the backlight regulating circuit of the present invention
Fig. 2 is the circuit diagram of backlight in backlight regulating circuit of the invention；
Fig. 3 is the drive waveforms of backlight regulating circuit first LED light string and the second LED light string under low grayscale of the present invention
Figure；
Fig. 4 is the flow chart of the backlight adjusting method of the present invention.
Specific embodiment
Further to illustrate the technological means and its effect of the invention taken, below in conjunction with being preferably implemented for the present invention
Example and its attached drawing are described in detail.
Referring to Fig. 4, present invention firstly provides a kind of backlight adjusting method, this method can be used for the liquid with CABC functions
On crystal display screen, include the following steps：
Step 1 please refers to Fig.1 and with reference to Fig. 2, provides a backlight regulating circuit, including display data Acquisition Circuit 1, with
The pwm signal generation circuit 2 of the electric connection of display data Acquisition Circuit 1 electrically connects with the pwm signal generation circuit 2
The backlight drive circuit 3 connect and the backlight 4 being electrically connected with the backlight drive circuit 3；
The backlight 4 includes the first LED light string 41 and second LED light string in parallel with first LED light string 41
42。
Specifically, first LED light string 41 includes：First LED light 411 of multiple series connection, each first LED light 411
Between be equipped with interval, second LED light string 42 includes：Second LED light 421 of multiple series connection, each second LED light 421 are divided
The interval setting between each first LED light 411 is not corresponded to.
Further, the pwm signal generation circuit 2 can be the CABC modules in the driving IC of liquid crystal display panel,
The pwm signal output unit being electrically connected including grayscale comparing unit and with the grayscale comparing unit.
Step 2, the display data Acquisition Circuit 1 gather the grayscale value of current display picture, and are transferred to pwm signal production
Raw circuit 2.
Specifically, the display data Acquisition Circuit 1 collects the current grayscale value for showing picture and is transferred to pwm signal production
Grayscale comparing unit in raw circuit 2.
Step 3, the pwm signal generation circuit 2 generate corresponding pwm signal according to the grayscale value of current display picture and give
Backlight drive circuit 3, the backlight drive circuit 3 are dimmed by the pwm signal received；
Wherein, when the grayscale value of the current display picture is less than default grayscale threshold value, the pwm signal generates electricity
The pwm signal control backlight drive circuit 3 that road 2 generates adjusts first LED light string 41 and replaces with second LED light string 42
It shines；
When the grayscale value of the current display picture is equal to or higher than default grayscale threshold value, the pwm signal generates
The pwm signal control backlight drive circuit 3 that circuit 2 generates adjusts the bright of 41 and second LED light string 42 of the first LED light string
Degree reduces.
Specifically, grayscale comparing unit by the grayscale value of current display picture and is preset in the pwm signal generation circuit 2
Grayscale threshold value be compared, and according to comparative result send corresponding pwm signal generate control signal export to pwm signal it is single
Member, the pwm signal output unit generate corresponding pwm signal and export according to receiving pwm signal and generate control signal.
Specifically, the scope of default grayscale threshold value is 0 grayscale to 15 grayscale in the step 3, i.e., makes under low grayscale
First LED light string 41 replace with second LED light string 42 it is luminous, reduce under high gray the first LED light string 41 and
The brightness of second LED light string 42.
Further, referring to Fig. 3, when the grayscale value of the current display picture is less than default ash in the step 3
During rank threshold value, backlight drive circuit 3 receives the backlight drive signal generated after pwm signal with the backlight drive circuit 3 and is combined,
Corresponding first LED light string 41 and the second LED light string 42 the first drive waveforms of generation and the second drive waveforms respectively, described first
Drive waveforms are opposite with the current potential of second drive waveforms.By described in the first drive waveforms and the driving of the second drive waveforms
First LED light string replaces with second LED light string to shine, and compared with the prior art, also only there are one LED light under synchronization
String shines, and can equally reduce the power consumption of backlight module, saves electricity, and due to the visual persistence effect of human eye, described
First LED light string replaces with second LED light string when shining, and the phenomenon that backlight area is not in one piece bright, one piece dark, keeps away
Exempt from firefly effect, improve display quality.
It should be noted that when first LED light string 41 replaces with second LED light string 42 and to shine, described the
The glow frequency of one LED light string 41 and the second LED light string 42 is more than or equal to 30Hz, so as to which the persistence of vision of human eye be made full use of to imitate
Should, eliminate firefly effect.
In addition, when the grayscale value of the current display picture is equal to or higher than default grayscale threshold value, pwm signal generates
Circuit 2 then has by output one compared with low duty ratio pwm signal, while controls the first LED light string 41 and the second LED light string 42
Brightness reduce.
Referring to Fig. 1, and with reference to Fig. 2, the present invention also provides a kind of backlight regulating circuit, including：Display data acquisition electricity
Road 1, the pwm signal generation circuit 2 being electrically connected with the display data Acquisition Circuit 1 and the pwm signal generation circuit 2
The backlight drive circuit 3 of electric connection and the backlight 4 being electrically connected with the backlight drive circuit 3；
The backlight 4 includes the first LED light string 41 and second LED light string in parallel with first LED light string 41
42。
Specifically, first LED light string 41 includes：First LED light 411 of multiple series connection, each first LED light 411
Between be equipped with interval, second LED light string 42 includes：Second LED light 421 of multiple series connection, each second LED light 421 are divided
The interval setting between each first LED light 411 is not corresponded to.
Further, the pwm signal generation circuit 2 can be the CABC modules in the driving IC of liquid crystal display panel,
The pwm signal output unit being electrically connected including grayscale comparing unit and with the grayscale comparing unit.
It should be noted that the course of work of the circuit is：The display data Acquisition Circuit 1 gathers current display picture
Grayscale value, and be transferred to pwm signal generation circuit 2, the pwm signal generation circuit 2 is according to the grayscale of current display picture
Value generates corresponding pwm signal to backlight drive circuit 3, and the backlight drive circuit 3 is adjusted by the pwm signal received
Light；
Grayscale comparing unit will currently show the grayscale value of picture and default grayscale in the pwm signal generation circuit 2
Threshold value is compared, and is sent corresponding pwm signal generation control signal according to comparative result and given pwm signal output unit, institute
It states pwm signal output unit and generates corresponding pwm signal and export according to receiving pwm signal and generate control signal；
Wherein, when the grayscale value of the current display picture is less than default grayscale threshold value, the pwm signal generates electricity
The pwm signal control backlight drive circuit 3 that road 2 generates adjusts first LED light string 41 and replaces with second LED light string 42
It shines；
When the grayscale value of the current display picture is equal to or higher than default grayscale threshold value, the pwm signal generates
The pwm signal control backlight drive circuit 3 that circuit 2 generates adjusts the bright of 41 and second LED light string 42 of the first LED light string
Degree reduces.
Further, referring to Fig. 3, when the grayscale value of the current display picture is less than default grayscale threshold value, the back of the body
Light drive circuit 3 receives the backlight drive signal generated after pwm signal with the backlight drive circuit 3 and is combined, and respectively corresponding the
One LED light string 41 and the second LED light string 42 generate the first drive waveforms and the second drive waveforms, first drive waveforms with
The current potential of second drive waveforms is opposite.First LED light string is driven by the first drive waveforms and the second drive waveforms
Replace with second LED light string and shine, compared with the prior art, also only shine under synchronization there are one LED light string, equally
The power consumption of backlight module can be reduced, saves electricity, and due to the visual persistence effect of human eye, in first LED light string
Replace with second LED light string when shining, the phenomenon that backlight area is not in one piece bright, one piece dark, avoid firefly
Effect improves display quality.
It should be noted that when first LED light string 41 replaces with second LED light string 42 and to shine, described the
The glow frequency of one LED light string 41 and the second LED light string 42 is more than or equal to 30Hz, so as to which the persistence of vision of human eye be made full use of to imitate
Should, eliminate firefly effect.
Specifically, the scope of the default grayscale threshold value is 0 grayscale to 15 grayscale, i.e., so that described the under low grayscale
One LED light string 41 replaces with second LED light string 42 to shine, and reduces the first LED light string 41 and described second under high gray
The brightness of LED light string 42.
In addition, when the grayscale value of the current display picture is equal to or higher than default grayscale threshold value, pwm signal generates
Circuit 2 then has by output one compared with low duty ratio pwm signal, while controls the first LED light string 41 and the second LED light string 42
Brightness reduce.
In conclusion the present invention provides a kind of backlight adjusting methods, produced in low grayscale by pwm signal generation circuit
Raw pwm signal control backlight drive circuit adjusting first LED light string replaces with second LED light string to shine, and compares
It also only shines under the prior art, synchronization there are one LED light string, can equally reduce the power consumption of backlight module, save electricity
Amount, and due to the visual persistence effect of human eye, when first LED light string replaces with second LED light string and shines, the back of the body
The phenomenon that light region is not in one piece bright, one piece dark, avoids firefly effect, improves display quality.The present invention provides
A kind of backlight regulating circuit, can eliminate firefly effect during low grayscale, promote display quality, reduce backlight power consumption.
The above, for those of ordinary skill in the art, can be with technique according to the invention scheme and technology
Other various corresponding changes and deformation are made in design, and all these changes and deformation should all belong to the claims in the present invention
Protection domain.
Claims (10)
1. a kind of backlight adjusting method, which is characterized in that include the following steps：
Step 1 provides a backlight regulating circuit, including display data Acquisition Circuit (1) and the display data Acquisition Circuit
(1) pwm signal generation circuit (2) being electrically connected, the backlight drive electricity being electrically connected with the pwm signal generation circuit (2)
Road (3) and the backlight (4) being electrically connected with the backlight drive circuit (3)；
The backlight (4) includes the first LED light string (41) and second LED light in parallel with first LED light string (41)
It goes here and there (42)；
The grayscale value of step 2, the current display picture of the display data Acquisition Circuit (1) acquisition, and it is transferred to pwm signal generation
Circuit (2)；
Step 3, the pwm signal generation circuit (2) generate corresponding pwm signal to the back of the body according to the grayscale value of current display picture
Light drive circuit (3), the backlight drive circuit (3) are dimmed by the pwm signal received；
Wherein, when the grayscale value of the current display picture is less than default grayscale threshold value, the pwm signal generation circuit
(2) the pwm signal control backlight drive circuit (3) generated adjusts first LED light string (41) and second LED light string
(42) alternately shine；
When the grayscale value of the current display picture is equal to or higher than default grayscale threshold value, the pwm signal generation circuit
(2) the pwm signal control backlight drive circuit (3) generated adjusts first LED light string (41) and the second LED light string (42)
Brightness reduce.
2. backlight adjusting method as described in claim 1, which is characterized in that first LED light string (41) includes：Multiple strings
The first LED light (411) of connection, interval is equipped between each first LED light (411), and second LED light string (42) includes：It is more
The second LED light (421) of a series connection, each second LED light (421) correspond to the interval between each first LED light (411) respectively
It sets.
3. backlight adjusting method as described in claim 1, which is characterized in that the model of default grayscale threshold value in the step 3
It encloses for 0 grayscale to 15 grayscale.
4. backlight adjusting method as described in claim 1, which is characterized in that the first LED light string (41) described in the step 3
When replacing luminous with second LED light string (42), the luminous frequency of first LED light string (41) and the second LED light string (42)
Rate is more than or equal to 30Hz.
5. backlight adjusting method as described in claim 1, which is characterized in that when the current display picture in the step 3
Grayscale value be less than default grayscale threshold value when, backlight drive circuit (3) receive pwm signal after with the backlight drive circuit
(3) the backlight drive signal generated combines, and corresponds to the first LED light string (41) respectively and the second LED light string (42) generates first and drives
Dynamic waveform and the second drive waveforms, first drive waveforms are opposite with the current potential of second drive waveforms.
6. a kind of backlight regulating circuit, which is characterized in that including：Display data Acquisition Circuit (1) is gathered with the display data
The backlight that the pwm signal generation circuit (2) and the pwm signal generation circuit (2) that circuit (1) is electrically connected are electrically connected is driven
Dynamic circuit (3) and the backlight (4) being electrically connected with the backlight drive circuit (3)；
The backlight (4) includes the first LED light string (41) and second LED light in parallel with first LED light string (41)
It goes here and there (42)；
The grayscale value of the current display picture of display data Acquisition Circuit (1) acquisition, and it is transferred to pwm signal generation circuit
(2), the pwm signal generation circuit (2) generates corresponding pwm signal to backlight drive according to the grayscale value of current display picture
Circuit (3), the backlight drive circuit (3) are dimmed by the pwm signal received；
Wherein, when the grayscale value of the current display picture is less than default grayscale threshold value, the pwm signal generation circuit
(2) the pwm signal control backlight drive circuit (3) generated adjusts first LED light string (41) and second LED light string
(42) alternately shine；
When the grayscale value of the current display picture is equal to or higher than default grayscale threshold value, the pwm signal generation circuit
(2) the pwm signal control backlight drive circuit (3) generated adjusts first LED light string (41) and the second LED light string (42)
Brightness reduce.
7. backlight regulating circuit as claimed in claim 6, which is characterized in that first LED light string (41) includes：Multiple strings
The first LED light (411) of connection, interval is equipped between each first LED light (411), and second LED light string (42) includes：It is more
The second LED light (421) of a series connection, each second LED light (421) correspond to the interval between each first LED light (411) respectively
It sets.
8. backlight regulating circuit as claimed in claim 6, which is characterized in that the scope of the default grayscale threshold value is 0 ash
Rank is to 15 grayscale.
9. backlight regulating circuit as claimed in claim 6, which is characterized in that first LED light string (41) and described second
When LED light string (42) alternately shines, the glow frequency of first LED light string (41) and the second LED light string (42) is more than or equal to
30Hz。
10. backlight regulating circuit as claimed in claim 6, which is characterized in that when the grayscale value of the current display picture is low
When default grayscale threshold value, backlight drive circuit (3) receives the back of the body generated after pwm signal with the backlight drive circuit (3)
Optical drive signal combines, and corresponds to the first LED light string (41) and the second LED light string (42) respectively and generates the first drive waveforms and the
Two drive waveforms, first drive waveforms are opposite with the current potential of second drive waveforms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610351213.8A CN105810156B (en) | 2016-05-25 | 2016-05-25 | Backlight adjusting method and backlight regulating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610351213.8A CN105810156B (en) | 2016-05-25 | 2016-05-25 | Backlight adjusting method and backlight regulating circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105810156A CN105810156A (en) | 2016-07-27 |
| CN105810156B true CN105810156B (en) | 2018-06-01 |
Family
ID=56452882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610351213.8A Active CN105810156B (en) | 2016-05-25 | 2016-05-25 | Backlight adjusting method and backlight regulating circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105810156B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106782346A (en) * | 2016-12-29 | 2017-05-31 | 深圳市华星光电技术有限公司 | A kind of backlight module circuit and liquid crystal display |
| CN108335677B (en) * | 2018-02-11 | 2019-12-24 | 京东方科技集团股份有限公司 | Luminance compensation method, luminance compensation device, and display device |
| CN109637437B (en) * | 2019-01-30 | 2020-07-17 | 北京凯视达科技有限公司 | Image display control method, device, medium and display screen control system |
| CN111554240B (en) | 2020-05-29 | 2022-08-16 | 上海天马微电子有限公司 | Display device driving method and display device |
| CN113433735A (en) * | 2021-06-29 | 2021-09-24 | 上海摩软通讯技术有限公司 | Backlight module, backlight plate, display screen and electronic equipment |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070109532A (en) * | 2006-05-11 | 2007-11-15 | 삼성전자주식회사 | Backlight and method for driving backlight and liquid crystal display having the same |
| CN101630493B (en) * | 2009-07-10 | 2013-09-18 | 天马微电子股份有限公司 | Liquid crystal display device |
| CN103415109B (en) * | 2013-07-22 | 2015-09-30 | 深圳Tcl新技术有限公司 | The method of adjustment of LED-backlit brightness |
| CN104930387A (en) * | 2015-06-11 | 2015-09-23 | 合肥鑫晟光电科技有限公司 | LED lamp strip structure, controlling method of LED lamp strip structure, backlight module and liquid-crystal display device |
| CN105047144B (en) * | 2015-09-08 | 2018-01-12 | 武汉华星光电技术有限公司 | Liquid crystal display device and its method for controlling backlight thereof |
| CN105321478B (en) * | 2015-12-09 | 2019-04-26 | 武汉华星光电技术有限公司 | Backlight drive circuit, liquid crystal display and backlight adjusting method |
| CN105590588B (en) * | 2015-12-21 | 2018-06-29 | 武汉华星光电技术有限公司 | Backlight adjusting method, liquid crystal display device and electronic equipment |
-
2016
- 2016-05-25 CN CN201610351213.8A patent/CN105810156B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105810156A (en) | 2016-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105810156B (en) | Backlight adjusting method and backlight regulating circuit | |
| CN101183831B (en) | DC-DC converter, liquid crystal display device, aging test apparatus of liquid crystal display device, and method thereof | |
| US7233309B2 (en) | Coordinating backlight frequency and refresh rate in a panel display | |
| KR101329967B1 (en) | Back light unit and liquid crystal display device using the same and driving method thereof | |
| CN105047144B (en) | Liquid crystal display device and its method for controlling backlight thereof | |
| CN106297731A (en) | Strengthen the method and device of picture contrast, display screen and intelligent terminal | |
| CN103413539A (en) | Control method, control device and display device of backlight drive | |
| CN101389177A (en) | Light regulating circuit | |
| CN102006696B (en) | Light-emitting diode backlight drive circuit, method and constant current source thereof | |
| CN101790270A (en) | LED backlight brightness dynamic control method and system adopting same | |
| CN105096842A (en) | LED lamp bar drive circuit and dimming method thereof, backlight module and display device | |
| WO2022217628A1 (en) | Backlight brightness control method and apparatus, and display device | |
| CN104091570A (en) | Backlight circuit, driving method of backlight circuit, backlight module and display device | |
| CN109389947A (en) | Show equipment | |
| CN108780627A (en) | A kind of the backlight power control method and liquid crystal display of liquid crystal display | |
| CN103810986B (en) | Drive method, light supply apparatus and the display device with the light supply apparatus of light source | |
| CN101777322B (en) | Liquid crystal display television system | |
| CN202855274U (en) | Time-sequence control circuit, backlight scanning driving system and backlight source | |
| CN102750912B (en) | LED backlight dynamic control device and control method thereof | |
| CN102026439B (en) | Driving device and driving method for light emitting diode | |
| CN106384576B (en) | Liquid Crystal Display And Method For Driving | |
| CN202178047U (en) | Liquid crystal display backlight device with integral light-adjusting function | |
| CN1877682A (en) | Liquid crystal display device and its drive method | |
| CN201392641Y (en) | Drive circuit for driving liquid crystal module group | |
| TWI524323B (en) | High performance lcd local dimming method and system thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |