CN106205508A - Backlight adjusting method and backlight adjusting means for liquid crystal indicator - Google Patents
Backlight adjusting method and backlight adjusting means for liquid crystal indicator Download PDFInfo
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- CN106205508A CN106205508A CN201610842211.9A CN201610842211A CN106205508A CN 106205508 A CN106205508 A CN 106205508A CN 201610842211 A CN201610842211 A CN 201610842211A CN 106205508 A CN106205508 A CN 106205508A
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- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- GPXJNWSHGFTCBW-UHFFFAOYSA-N Indium phosphide Chemical compound [In]#P GPXJNWSHGFTCBW-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- 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 invention discloses the backlight adjusting method for liquid crystal indicator and backlight adjusting means.Described backlight adjusting method includes: previous frame image data compared with current frame image data, to judge the type of display content；And according to the different types of LED of type selecting of display content as back light, thus adjusting backlight luminance.This backlight adjusting method is according to the display different types of back light of content choice, thus takes into account the requirement improving picture quality and low-power consumption.
Description
Technical field
The present invention relates to Display Technique field, more particularly, to for liquid crystal indicator backlight adjusting method and
Backlight adjusting means.
Background technology
Liquid crystal indicator is that the phenomenon that the orientation utilizing liquid crystal molecule changes under the effect of electric field changes
The display device of light source light transmittance.Owing to having the advantage that display quality is good, volume is little and low in energy consumption, liquid crystal indicator is
It is widely used in the mobile terminal of such as mobile phone and the large scale display floater of such as flat panel TV.
A kind of typical liquid crystal indicator includes the first glass substrate and the second glass substrate, the of the first glass substrate
One surface is relative with the first surface of the second glass substrate.On the first surface of the first glass substrate, formation arranges intersected with each other
A plurality of controlling grid scan line and a plurality of source data line, the crossover location at the two arrange selection thin film transistor (TFT) and pixel electricity
Pole.First surface at the second glass substrate forms public electrode.Liquid crystal layer is comprised between pixel electrode and public electrode, permissible
It is equivalent to pixel capacitance.In the driving method of above-mentioned liquid crystal indicator, in each frame period, in the control of time schedule controller
A plurality of controlling grid scan line is scanned successively under system.Thin film transistor (TFT) is gated via controlling grid scan line, and will via source data line
The voltage corresponding with GTG applies to pixel capacitance, thus changes the orientation of liquid crystal molecule.The orientation of liquid crystal molecule changes to be made
There is corresponding change in the light transmittance obtaining pixel cell.
Liquid crystal indicator includes backlight assembly, is used for producing backlight.Such as, backlight assembly can include multiple LED
As light source.Backlight assembly is positioned at the second surface side of the first glass substrate.Backlight sequentially passes through the first glass substrate and
Two glass substrates arrive the eyes of beholder.Owing to the light transmittance of each pixel cell is affected by liquid crystal molecular orientation, because of
This can be by controlling the orientation display image of liquid crystal molecule.
In actual applications, it is desirable to liquid crystal indicator can according to image attributes control backlight illumination, thus improve right
Than degree to improve picture quality.Additionally, control backlight illumination according to varying environment optical condition, such as, carry under the conditions of outdoor optical
High backlight illumination, to improve observability, reduces backlight illumination to alleviate human eye vision fatigue and to meet low merit under the conditions of room light
Consumption requirement.
Summary of the invention
In view of the above problems, it is an object of the invention to provide backlight adjusting method and the backlight for liquid crystal indicator to adjust
Regulating device, wherein, according to the display different types of back light of content choice, thus takes into account and improves picture quality and low-power consumption
Requirement.
According to an aspect of the present invention, it is provided that a kind of backlight adjusting method for liquid crystal indicator, including: by previous
Frame image data compares with current frame image data, to judge the type of display content；And the class according to display content
The type different types of LED of selection is as back light, thus adjusting backlight luminance.
Preferably, described different types of LED includes first group of LED and second group of LED, described first group of LED
The nominal luminance of lamp is higher than the nominal luminance of described second group of LED.
Preferably, the type of described display content includes tableaux and dynamic menu, in the type of described display content
During for dynamic menu, select first group of LED as back light, when the type of described display content is tableaux, select
Select second group of LED as back light.
Preferably, also include: at the end of each frame period, store previous frame image data；And in each frame period
During beginning, it is thus achieved that current frame image data.
According to a further aspect in the invention, it is provided that a kind of backlight adjusting means for liquid crystal indicator, including figure
Processing module, for comparing previous frame image data with current frame image data, to judge the type of display content；With
And selection module, for according to the different types of LED of type selecting of display content as back light, thus regulate backlight
Brightness.
Preferably, the type of described display content includes tableaux and dynamic menu, described different types of LED bag
Including first group of LED and second group of LED, the nominal luminance of described first group of LED is higher than the nominal of described second group of LED
Brightness, when the type of described display content is dynamic menu, described selection module selects first group of LED as backlight light
Source, when the type of described display content is tableaux, described selection module selects second group of LED as back light.
Preferably, described image processing module produces feedback signal according to result of the comparison, for indicating display content
Type, described backlight adjusting means also includes LED driver, and described LED driver produces according to described feedback signal and selects letter
Number and drive signal, described selection signal has different level states according to the type of described display content.
Preferably, described selection module includes the first switching tube and the second switch pipe being connected in parallel with each other, described first
The hot end of switching tube is connected to intermediate node, the low electricity of described first switching tube with the hot end of described second switch pipe
Position end is connected to the hot end of described first group of LED, and the cold end of described second switch pipe is connected to described second group of LED
Hot end, described first switching tube and described second switch pipe respective control end receive described selection signal, described in
Intermediate node receives described driving signal.
Preferably, described first switching tube and described second switch pipe are for partly to lead selected from bipolar transistor and metal-oxide
Any one of body field-effect transistor.
Preferably, described first switching tube is positive-negative-positive bipolar transistor, and its hot end, cold end and control end divide
Not Wei emitter stage, colelctor electrode and base stage, described second switch pipe is npn type bipolar transistor, its hot end, cold end and
Control end and be respectively colelctor electrode, emitter stage and base stage.
Backlight assembly according to inventive embodiments includes different types of LED, utilizes the physics of different types of LED
Characteristic extension backlight illumination range of accommodation.According to display content, different types of LED can be selected as light source.Such as, aobvious
Show and high-brightness LED lamp when content is dynamic menu, can be selected as light source, can select when display content is tableaux
Common LED lamp is as light source.Therefore, in the backlight assembly of this embodiment, it is possible to use different types of LED takes into account improvement
Picture quality and the requirement of low-power consumption.
In the backlight assembly of this embodiment, in the continuous print frame period, it is dynamically selected light source according to display content, profit
The requirement improving picture quality and low-power consumption is taken into account by different types of LED.The backlight adjusting method of this embodiment can subtract
The visual fatigue of light human eye, provides the user with more preferable visual experience and enjoyment.
Accompanying drawing explanation
By description to the embodiment of the present invention referring to the drawings, above-mentioned and other purposes of the present invention, feature and
Advantage will be apparent from.
Fig. 1 illustrates the principle schematic according to the backlight assembly used in the liquid crystal indicator of prior art.
Fig. 2 illustrates the principle schematic of the backlight assembly used in liquid crystal indicator according to embodiments of the present invention.
Fig. 3 illustrates the flow chart of the backlight adjusting method used in liquid crystal indicator according to embodiments of the present invention.
Fig. 4 illustrates the schematic frame of the backlight adjusting means used in liquid crystal indicator according to embodiments of the present invention
Figure.
Fig. 5 illustrates the schematic block diagram of the pattern process module used in the backlight adjusting means of Fig. 4.
Fig. 6 illustrates the schematic block diagram of the drive circuit used in the backlight adjusting means of Fig. 4.
Detailed description of the invention
It is more fully described various embodiments of the present invention hereinafter with reference to accompanying drawing.In various figures, identical element
Same or similar reference is used to represent.For the sake of clarity, the various piece in accompanying drawing is not necessarily to scale.
Below in conjunction with the accompanying drawings and embodiment, the detailed description of the invention of the present invention is described in further detail.
Fig. 1 illustrates the principle schematic according to the backlight assembly used in the liquid crystal indicator of prior art.Backlight group
Part includes light guide plate 110 and Rhizoma Dioscoreae (peeled) 120 (light bar).According to the radiation modality of Rhizoma Dioscoreae (peeled) 120, backlight assembly can be divided into side
Enter formula and straight-down negative.Figure 1 illustrates side entrance back assembly, wherein, Rhizoma Dioscoreae (peeled) 120 is positioned at the side edges of light guide plate 110, light
The light that bar 120 produces is incident to light guide plate 110 from the side of light guide plate 110.In alternate embodiments, under can using directly
Formula backlight assembly substitutes side entrance back assembly, and wherein, Rhizoma Dioscoreae (peeled) 120 is positioned on the surface of light guide plate 110, and Rhizoma Dioscoreae (peeled) 120 produces
Light is incident to light guide plate 110 from the surface of light guide plate 110.
The acrylic board of light guide plate 110 e.g. high transmission rate, smooth surface is smooth so that major part light is at light guide plate
It is totally reflected on the surface of 110, thus guides back of the body scattering of light direction.The backlight that LED in Rhizoma Dioscoreae (peeled) 120 produces is through light guide plate
After 110 reflections, it is evenly distributed in the whole plane of light guide plate 110.The area of light guide plate 110 and liquid crystal indicator
Pixel region is corresponding, such that it is able to provide uniform backlight for whole pixel region.
Rhizoma Dioscoreae (peeled) 120 includes printed circuit board (PCB) (not shown) and the multiple LED 121 being arranged on.The plurality of LED
121 are one another in series and/or are connected in parallel.In the backlight assembly of prior art, the plurality of LED 121 is same type
LED.
Generally, LED (light emitting diode) can be categorized as general brightness LED (luminous intensity < 10mcd) and high by luminous intensity
Brightness LED.Herein, the type of LED is distinguished according to nominal luminance.High-brightness LED can be subdivided into again luminous intensity 10～
The high-brightness LED of 100mcd, and luminous intensity > ultra-high brightness LED of 100mcd.On material, normal monochrome light-emitting diodes
Pipe can use the material such as gallium phosphide (GaP) or gallium arsenide phosphide (GaAsP), and high brightness single color LED can use arsenic calorize
The materials such as gallium (GaAlAs), super brightness single color LED can use the materials such as phosphorus indium GaAs (GaAsInP).Electrically
In parameter, the forward saturation voltage drop of common LED is usually 1.6V～2.1V, and forward operating current is 5～20mA.High-brightness LED
Forward saturation voltage drop differs greatly because glow color is different, and from 2V～3.5V, forward operating current is more than 15mA, super
The forward operating current of highlighted LED can reach mA up to a hundred.
In the backlight assembly of prior art, the multiple LED 121 in lamp bar 120 use same type LED can letter
Change control circuit and improve Luminescence Uniformity.The plurality of LED 121 is segmented into one or more groups.In the former case,
Use pwm signal to control effective lighting time of multiple LED 121, thus regulate the backlight illumination of backlight assembly.The latter's
Under situation, by optionally lighting one or more groups LED, thus regulate the backlight illumination of backlight assembly.
Such as, user can regulate the dutycycle of pwm signal by regulation brightness regulation knob (such as dutycycle is 0-
100%).In the high level stage of pwm signal, the plurality of LED 121 is lighted.In the low level stage of pwm signal, described
Multiple LED 121 are extinguished.In each switch periods, effective lighting time of the plurality of LED 121 accounts for pwm signal
Empty ratio is directly proportional.Therefore, by regulating the dutycycle of pwm signal, backlight illumination also will occur corresponding change.
The backlight assembly of the prior art can realize the regulation of backlight illumination.But, at pwm signal adjusting backlight luminance
When, due to use single type LED, it is possible to achieve brightness regulation scope remain the physics by LED
The restriction of characteristic.When the plurality of LED uses general brightness LED, the range of accommodation of backlight illumination is too small.The plurality of
When LED uses high-brightness LED, although pwm signal can be utilized to realize the wide tuning range of backlight illumination, but power consumption is the most corresponding
Ground increases.Therefore, in existing backlight assembly, it is difficult to take into account the requirement improving picture quality and low-power consumption.
Fig. 2 illustrates the principle schematic of the backlight assembly used in liquid crystal indicator according to embodiments of the present invention.The back of the body
Optical assembly includes light guide plate 110 and Rhizoma Dioscoreae (peeled) 120 (light bar).Rhizoma Dioscoreae (peeled) 120 is positioned at a side edges of light guide plate 110.
The light guide plate 110 of backlight assembly employing according to this embodiment is adopted with the backlight assembly of the prior art shown in Fig. 1
Light guide plate identical, be not described in detail in this.
Rhizoma Dioscoreae (peeled) 120 includes printed circuit board (PCB) (not shown) and the first group of LED 121 being arranged on and second group of LED
Lamp 122.First group of LED 121 includes the LED of the multiple first kind being one another in series and/or being connected in parallel.Second group of LED
Lamp 122 includes the LED of the multiple Second Types being one another in series and/or being connected in parallel.At the backlight assembly according to this embodiment
In, the most highlighted LED of LED of the first kind, the lowest bright LED of LED of Second Type.
In a preferred embodiment, a LED in first group of LED 121 and corresponding in second group of LED 122
Individual LED is packaged into a chip U1.This chip U1 has four pins, and pin 1 and 2 is respectively connecting to the sun of a LED
Pole and negative electrode, pin 3 and 4 is respectively connecting to anode and the negative electrode of another LED.Different types of LED is integrated into core
Sheet, it is possible to reduce the spatial volume of LED, thus the structure of LED display need not be revised, can show by compatible existing LED
Showing device.In alternate embodiments, first group of LED 121 and second group of LED 122 include LED independent of each other respectively
Lamp.
In the backlight assembly of this embodiment, first group of LED 121 and second group of LED 122 in lamp bar 120 use
Different types of LED.This backlight assembly is possible not only to individually control first group of LED 121 and the brightness of second group of LED 122,
And one of first group of LED 121 and second group of LED 122 can be selected to work, such that it is able to realize the wide tune of backlight illumination
Adjusting range.
When individually controlling the brightness of first group of LED 121 and second group of LED 122, first group of LED 121
Can be each separated into one or more groups with second group of LED 122.In the former case, pwm signal is used to control multiple LED
Effective lighting time of lamp, thus regulate the backlight illumination of backlight assembly.When the latter, by optionally lighting one
Group or organize LED more, thus regulate the backlight illumination of backlight assembly.
Such as, when individually controlling the brightness of first group of LED 121, user can be by regulation brightness regulation
Knob regulates the dutycycle (such as dutycycle is 0-100%) of pwm signal.In the high level stage of pwm signal, described first
Group LED 121 is lighted.In the low level stage of pwm signal, described first group of LED 121 is extinguished.In each switch periods,
Effective lighting time of described first group of LED 121 is directly proportional to the dutycycle of pwm signal.Therefore, by regulation pwm signal
Dutycycle, backlight illumination also will occur corresponding change.
When selecting the work of one of first group of LED 121 and second group of LED 122, pwm signal can be carried
Supply first group of LED 121 and turn off second group of LED 122, to realize the backlight control of highlighted scope, or, can be by
Pwm signal is supplied to second group of LED 122 and turns off first group of LED 121, to realize the backlight control of normal range.Cause
This, by selecting one of first group of LED 121 and second group of LED 122, backlight illumination also will occur corresponding change.
The backlight assembly of this embodiment includes different types of LED, utilizes the physical characteristic of different types of LED to expand
Exhibition backlight illumination range of accommodation.According to display content, different types of LED can be selected as light source.Such as, in display content
For high-brightness LED lamp can be selected during dynamic menu as light source, common LED can be selected when display content is tableaux
Lamp is as light source.Therefore, in the backlight assembly of this embodiment, it is possible to use different types of LED takes into account improvement figure picture element
Amount and the requirement of low-power consumption.
Fig. 3 illustrates the flow chart of the backlight adjusting method used in liquid crystal indicator according to embodiments of the present invention.?
In this embodiment, according to the different types of LED of Dynamic Announce content choice as light source.
In step S01, after a backlight adjusting means frame image data before display, memory element store former frame
View data.Described view data is generally gathered by graphic process unit GPU and processes.
Described memory element is such as included in the backlight adjusting means for backlight module carries out brightness regulation.Aobvious
At the end of showing the frame period of previous frame image data, the memory element in backlight adjusting means store previous frame image data.
In step S02, backlight adjusting means is in the frame period of display current frame image data, it is thus achieved that current frame image
Data.Described view data can be gathered by graphic process unit GPU and process.
In step S03, the former frame data of storage are compared by backlight adjusting means with current frame data, thus sentence
The display content of disconnected liquid crystal indicator is tableaux or dynamic menu.
In this embodiment, it is defined as tableaux when previous frame image data are identical with current frame image data,
Previous frame image data and current frame image data are defined as dynamic menu when differing.In alternate embodiments, previous
It is defined as tableaux, at previous frame image number when the difference of frame image data and current frame image data is less than or equal to predetermined value
It is defined as dynamic menu during according to the difference with current frame image data more than predetermined value.The e.g. brightness of this difference changes
The quantity of pixel cell, or the rate of change of the mean flow rate of whole pixel region.
In step S04, when previous frame image data are different from current frame image data, i.e. it is judged as dynamic menu,
Backlight adjusting means selects first group of LED to light and turn off second group of LED, i.e. selects high-brightness LED lamp as light source.
Such as, during the edit-modify of video display process, the picture playing process of game or text, at continuous print
Frame period shows dynamic menu.Use when showing dynamic menu high brightness backlights can improve contrast thus improve image
Quality.
In step S05, when previous frame image data are identical with current frame image data, i.e. it is judged as tableaux,
Backlight adjusting means selects second group of LED to light and turn off first group of LED, i.e. selects general brightness LED as light
Source.
Such as, suspend in video playback, the picture of game suspended or in the watching process of text, in the continuous print frame period
Display tableaux.Use general brightness backlight can alleviate the visual fatigue of human eye and reduce merit when showing tableaux
Consumption.
In step S06, current frame image data are supplied to source electrode driver by Graphics Processing Unit further, are used for producing
Raw source drive signal.Then, source drive signal is supplied to corresponding pixel cell via source data line, thus controls
The orientation of liquid crystal molecule shows to realize image.
After step S06, Graphics Processing Unit terminates the display of current frame image data.It is then return to step S01,
Thus continue the display of next frame view data.
In existing liquid crystal indicator, screen imaging principle is dependent on graphic process unit GPU and constantly processes picture number
According to maintaining.Liquid crystal indicator can include external frame capture card, to facilitate analysis to limit frame statistical data.Graphic process unit
Present frame is contrasted by the effect of GPU exactly with former frame, and utilizes counter keeps track idle frame, last statistical data.Liquid
Crystal device can include screen internal memory, it is achieved view data stores, it is necessary to by each two field picture number shown by screen
According to contrasting, in order to analyze the statistical data limiting each frame.When graphic process unit GPU recognizes when former frame picture data
During with previous frame image data consistent, just other transmission circuits are carried out pending operation.It is to say, when the picture shown by screen
When face remained unchanged within a bit of time, screen the most automatically detects and no longer refreshes.
In the backlight adjusting method of this embodiment, it is possible to use graphic process unit GPU in liquid crystal indicator realizes
The storage of view data and comparing.Further, backlight adjusting means is according to showing that the different types of LED of content choice is as light
Source.Such as, high-brightness LED lamp can be selected when showing dynamic menu as light source, can select when showing tableaux
Common LED lamp is as light source.Therefore, in the backlight assembly of this embodiment, move according to display content in the continuous print frame period
State ground selects light source, utilizes different types of LED to take into account the requirement improving picture quality and low-power consumption.The backlight of this embodiment
Control method can alleviate the visual fatigue of human eye, provides the user with more preferable visual experience and enjoyment.
Fig. 4 illustrates the schematic frame of the backlight adjusting means used in liquid crystal indicator according to embodiments of the present invention
Figure.Backlight adjusting means includes pattern process module 130, LED driver 140, selects 150, first group of LED 121 and of module
Second group of LED 122.Such as, first group of LED 121 includes multiple high-brightness LED, and second group of LED includes multiple the brightest
Degree LED.
View data is sampled and stores by pattern process module 130, and by current frame image data and former frame
View data compares, and is dynamic menu or tableaux to judge display content.LED driver 140 not only produces and carries
For the driving electric current of LED, and produce according to the judged result of pattern process module 130 and select signal.Select module 150 basis
Select signal, select first group of LED 121 to be connected with LED driver 140 with one of second group of LED 122, thus driving
Desired backlight illumination is produced under the effect of streaming current.Such as, high-brightness LED lamp conduct can be selected when showing dynamic menu
Light source, can select common LED lamp as light source when showing tableaux.
Fig. 5 illustrates the schematic block diagram of the pattern process module 130 used in the backlight adjusting means of Fig. 4.At this image
Reason module 130 includes data processing unit 131, output unit 132, memory element 133 and comparing unit 134.As it has been described above, figure
Shape processing module 130 can be realized major part function by graphic process unit GPU in available liquid crystal display device.
Data processing unit 131 receives view data Din.View data Din is provided to output by data processing unit 131
Unit 132.This output unit 132 produces view data Dout, then further provides for view data Dout to source electrode driver,
For producing source drive signal, thus drive corresponding pixel cell to realize image and show.
The view data of former frame, at the end of each frame period, is stored in memory element 133 by data processing unit 131
In.When each frame period starts, the view data of present frame is supplied to comparing unit 134.Comparing unit 134 is by former frame
View data with currently compare with frame image data, thus judge that the display content of liquid crystal indicator is tableaux
Or dynamic menu.Comparing unit 134 produces feedback signal FB, for indicating the type of display content.
Fig. 6 illustrates the schematic block diagram of the drive circuit used in the backlight adjusting means of Fig. 4.Drive circuit includes LED
Driver 140, selection 150, first group of LED 121 of module and second group of LED 122.Such as, first group of LED 121 includes
Multiple high-brightness LEDs, second group of LED includes multiple general brightness LED.
LED driver 140 obtains feedback signal FB from pattern process module 130.Further, produce according to feedback signal FB
Raw selection signal SEL and driving signal Vout.
Such as, when feedback signal FB instruction display content is tableaux, described selection signal is low level, in feedback
When signal FB instruction display content is dynamic menu, described selection signal is high level.
Module 150 is selected to include switching tube Q1 and Q2 being connected in parallel.The hot end of switching tube Q1 is with switching tube Q2's
Hot end is connected.Further, the cold end of switching tube Q1 is connected to the hot end of first group of LED 121, switch
The cold end of pipe Q2 is connected to the hot end of second group of LED 122.Switching tube Q1 and Q2 respective control end and the two
Intermediate node is connected to LED driver 140.Described control end receives and selects signal SEL, and described intermediate node receives and drives signal
Vout。
When being high level selecting signal, switching tube Q1 conducting and switching tube Q2 disconnect, thus by first group of LED 121
It is connected to LED driver 140.Now, module 150 is selected to select high-brightness LED as light source.
When being low level selecting signal, switching tube Q2 conducting and switching tube Q1 disconnect, thus by second group of LED 122
It is connected to LED driver 140.Now, module 150 is selected to select general brightness LED as light source.
In this embodiment, switching tube Q1 is positive-negative-positive bipolar transistor, and its hot end, cold end and control end divide
Wei emitter stage, colelctor electrode and base stage.Switching tube Q2 is npn type bipolar transistor, its hot end, cold end and control end
It is respectively colelctor electrode, emitter stage and base stage.In alternate embodiments, phase inverter respectively switching tube Q1 and Q2 can be used to carry
For the control signal of opposite levels, and switching tube Q1 and Q2 can be bipolar transistor or the metal-oxide half of same type
Conductor field-effect transistor.
First group of LED 121 includes multiple high-brightness diode.According to the driving force of LED driver 140, Duo Gegao
Brightness diode can be connected in series and/or be connected in parallel.Second group of LED 122 includes multiple general brightness diode.According to
The driving force of LED driver 140, multiple general brightness diodes can be connected in series and/or be connected in parallel.
According to embodiments of the invention as described above, these embodiments do not have all of details of detailed descriptionthe, the most not
Limit the specific embodiment that this invention is only described.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is to preferably explain the principle of the present invention and actual application, so that affiliated
Technical field technical staff can utilize the present invention and amendment on the basis of the present invention to use well.The present invention is only by right
Claim and four corner thereof and the restriction of equivalent.
Claims (10)
1. for a backlight adjusting method for liquid crystal indicator, including:
Previous frame image data are compared with current frame image data, to judge the type of display content；And
The different types of LED of type selecting according to display content is as back light, thus adjusting backlight luminance.
Backlight adjusting method the most according to claim 1, wherein, described different types of LED includes first group of LED
With second group of LED, the nominal luminance of described first group of LED is higher than the nominal luminance of described second group of LED.
Backlight adjusting method the most according to claim 2, wherein, the type of described display content includes tableaux and moves
State picture,
When the type of described display content is dynamic menu, select first group of LED as back light, in described display
When the type held is tableaux, select second group of LED as back light.
Backlight adjusting method the most according to claim 1, also includes:
At the end of each frame period, store previous frame image data；And
When each frame period starts, it is thus achieved that current frame image data.
5. for a backlight adjusting means for liquid crystal indicator, including:
Pattern process module, for comparing previous frame image data with current frame image data, to judge display content
Type；And
Select module, for according to the different types of LED of type selecting of display content as back light, thus regulate the back of the body
Brightness.
Backlight adjusting means the most according to claim 5, wherein, the type of described display content includes tableaux and moves
State picture, described different types of LED includes first group of LED and second group of LED, the nominal of described first group of LED
Brightness is higher than the nominal luminance of described second group of LED,
When the type of described display content is dynamic menu, described selection module select first group of LED as back light,
When the type of described display content is tableaux, described selection module selects second group of LED as back light.
Backlight adjusting means the most according to claim 6, wherein, described image processing module produces according to result of the comparison
Feedback signal, for indicating the type of display content, described backlight adjusting means also includes LED driver,
Described LED driver produces according to described feedback signal and selects signal and drive signal, and described selection signal is according to described
The type of display content has different level states.
Backlight adjusting means the most according to claim 7, wherein, described selection module includes first be connected in parallel with each other
Switching tube and second switch pipe,
The hot end of the hot end of described first switching tube and described second switch pipe is connected to intermediate node, and described first
The cold end of switching tube is connected to the hot end of described first group of LED, and the cold end of described second switch pipe is connected to
The hot end of described second group of LED,
Described first switching tube and described second switch pipe respective control end receive described selection signal, and described intermediate node connects
Receive described driving signal.
Backlight adjusting means the most according to claim 8, wherein, described first switching tube and described second switch Guan Weixuan
From any one of bipolar transistor and mos field effect transistor.
Backlight adjusting means the most according to claim 9, wherein, described first switching tube is positive-negative-positive bipolar transistor,
Its hot end, cold end and control end are respectively emitter stage, colelctor electrode and base stage, and described second switch pipe is that NPN type is double
Gated transistors, its hot end, cold end and control end are respectively colelctor electrode, emitter stage and base stage.
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| CN107016966A (en) * | 2017-05-10 | 2017-08-04 | 昆山龙腾光电有限公司 | Back light module control system, control method and the liquid crystal module with the system |
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| CN110890063A (en) * | 2019-11-22 | 2020-03-17 | 深圳市华星光电半导体显示技术有限公司 | Method and device for reducing power consumption of display panel |
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