CN109686319A - The super more backlight subarea drive control circuits of one kind and display device - Google Patents
The super more backlight subarea drive control circuits of one kind and display device Download PDFInfo
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- CN109686319A CN109686319A CN201910045174.2A CN201910045174A CN109686319A CN 109686319 A CN109686319 A CN 109686319A CN 201910045174 A CN201910045174 A CN 201910045174A CN 109686319 A CN109686319 A CN 109686319A
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- Prior art keywords
- backlight
- driving
- controlling device
- switch controlling
- line
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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
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a kind of super more backlight subarea drive control circuits, including multiple backlights, multiple driving IC and multiple switch control device, multiple backlights are divided into multiple groups, each group of backlight is connected in ranks form and is driven by the same driving IC, wherein, the line number of each group of backlight is N, the columns of each group of backlight is identical as the driving driving number of IC, switch controlling device is equipped in every a line backlight, wherein, each backlight in every a line backlight is set between the output end of the row switch controlling device and each road input terminal of driving IC；In the same drive cycle T, the time of the switch controlling device closure of every a line is T/N in N row backlight, and only has switch controlling device corresponding to a line backlight therein to be in closed state in synchronization, N row backlight.The present invention also reduces process flow, increases production operation while reducing the quantity of backlight subarea driving IC, reducing cost.
Description
Technical field
The present invention relates to field of display technology, especially a kind of super more backlight subarea drive control circuits and display device.
Background technique
In field of display technology, current a few class mainstream display technologies: LCD, OLED, Micro LED and Mini LED.
Traditional LCD is the abbreviation of Liquid Crystal Display, i.e. liquid crystal display, using liquid crystal in different voltages
Under the action of can present different light characteristics be displaying principle.
OLED, Organic Light-Emitting Diode, Organic Electricity laser display, using with self luminous characteristic
Organic Light Emitting Diode, the very thin coating of organic material of use and glass substrate.Skill is shown compared to more traditional LCD, OLED
Art have many advantages, such as self-luminous, wide viewing angle, almost infinite high contrast, compared with low power consumption, high reaction speed.
Micro LED, i.e. LED miniatureization and matrixing technology, are display technologies of new generation.LED structure is designed and is carried out
Filming, microminiaturization, array, the LED array of the high density microsize integrated on a single die.Micro LED is each
A pixel can addressing, be operated alone and light, pixel distance is reduced to micron order from grade.Compared to existing OLED skill
Art, brightness is higher, luminous efficiency is more preferable but power consumption is lower.
But since Micro LED is miniature to 100 μm hereinafter, being designed into chip system from LED epitaxial growth by the size of LED chip
At the miniature process technique of technical matters and flood tide transfer techniques are current technology bottlenecks, it would be highly desirable to be solved.
Based on this, there is the Mini LED display technique between traditional LED and Micro LED.Mini LED, again
Name " secondary millimeter light emitting diode ", it is intended that crystallite dimension is about at 100 microns and its above LED.With Mini LED, it is all made of office
Portion's dimmer design, Mini LED ratio Micro LED technology difficulty are lower, it is easier to realize volume production, can be largely used to liquid crystal display
Backlight market.
But either Micro LED or Mini LED, is all made of local dimming design, i.e., each light modulation subregion is both needed to
One drives IC to carry out drive control.One handset demand amount about 9000 or so led, and 55 cun of TV panel backlit LED quantity
40,000 or so even more are needed, in this regard, the quantity demand of driving IC is huge accordingly.
By taking the display panel of 3200 subregion LED as an example, each subregion includes 16 LED, each subregion driving current 20mA
For illustrate.
As shown in Figure 1, traditional backlight LED drive control mode, drives IC, i.e., one driving using the LED on 16 tunnels
IC drives 16 paths of LEDs, then needs driving IC quantity to be used are as follows: NUMIC=3200 ÷ 16=200pcs, quantity are more.
As shown in Fig. 2, traditional backlight LED is driven, in a drive cycle, the PWM duty of driving current
Than being 100%, i.e., drive level is a fixed D. C. value in whole cycle, the maximum brightness in correspondence image, electric current without
Any multiplexing, the corresponding electric current of maximum brightness are as follows: 100% × 20mA.
As can be seen that the drive control mode of traditional backlight LED, needs to drive IC quantity various, product cost compared with
Height, manufacturing process are complex.
Summary of the invention
To solve problems of the prior art, the object of the present invention is to provide a kind of super more backlight subarea drive controls
Circuit and display device, the present invention also reduce technique stream while reducing the quantity of backlight subarea driving IC, reducing cost
Journey increases production operation.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of super more backlight subarea drive control circuits, packet
Multiple backlights, multiple driving IC and multiple switch control device are included, multiple backlights are divided into multiple groups, each group of backlight
Source connects in ranks form and is driven by the same driving IC, wherein the line number of each group of backlight is N, each group of back
The columns of light source is identical as the driving driving number of IC, is equipped with the switch controlling device in every a line backlight,
In, each road of output end and driving IC that each backlight in every a line backlight is set to the row switch controlling device inputs
Between end, all backlights that the switch controlling device is used to individually control the row are opened simultaneously or are closed；In the same drive
In dynamic cycle T, the time of the switch controlling device closure of every a line is T/N in N row backlight, and in synchronization, N row back
Only have switch controlling device corresponding to a line backlight therein to be in closed state in light source.
As a preferred embodiment, the switch controlling device includes GPIO mouthfuls of control port and PMOS tube, institute
It states GPIO mouthfuls to connect with the grid of the PMOS tube, the source electrode of PMOS tube and switch controlling device backlight of the row connect
It connects, the grounded drain of PMOS tube, under GPIO mouthfuls of control, driving current is exported with the duty ratio PWM wave of T/N, one
In a drive cycle T, drive level in pwm pulse arrange, and each pulsed drive control corresponding line backlight opening or
It closes.
As another preferred embodiment, when the driving current of multiple driving IC is driven normally for backlight
N times of electric current.
The present invention also provides a kind of display devices, drive including super more backlight subareas described in any one of above-mentioned technical proposal
Dynamic control circuit.
The beneficial effects of the present invention are: prominent function of the present invention, application scenarios are extensive, can significant increase and expansion Micro
The backlights display technology such as LED, Mini LED considerably reduces the number of LED driving IC while guaranteeing display effect
Amount, while reducing cost, reduces technical operation flow, has more operability, is suitable for more backlight subareas super to 1000+
Drive control.
Detailed description of the invention
Fig. 1 is the schematic diagram of traditional backlight source drive control mode；
Fig. 2 is the waveform diagram of ILED in one drive cycle of traditional backlight source drive control mode；
Fig. 3 is wherein one group of backlight driver control mode schematic diagram in the embodiment of the present invention；
Fig. 4 is the circuit diagram of switch controlling device in the embodiment of the present invention；
The waveform diagram that Fig. 5 is ILED in a drive cycle in the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described in detail with reference to the accompanying drawing.
Embodiment
As shown in Figure 3-Figure 5, a kind of super more backlight subarea drive control circuits, including multiple backlights, multiple driving IC
With multiple switch control device, multiple backlights are divided into multiple groups, and each group of backlight connects in ranks form and by same
One driving IC driving, wherein the line number of each group of backlight is N, the columns of each group of backlight and the driving IC
Driving number it is identical, be equipped with the switch controlling device in every a line backlight, wherein each of every a line backlight
Backlight is set between the output end of the row switch controlling device and each road input terminal of driving IC, the switch controlling device
All backlights for individually controlling the row are opened simultaneously or are closed；It is every in N row backlight in the same drive cycle T
The time of the switch controlling device closure of a line is T/N, and there was only a line back therein in synchronization, N row backlight
Switch controlling device corresponding to light source is in closed state.
Specifically, the switch controlling device includes GPIO mouthfuls of control port and PMOS tube, described GPIO mouthfuls with it is described
The grid of PMOS tube connects, and the source electrode of PMOS tube is connect with switch controlling device backlight of the row, the drain electrode of PMOS tube
Ground connection, under GPIO mouthfuls of control, driving current is exported with the duty ratio PWM wave of T/N, in a drive cycle T, is driven
Dynamic level is arranged in pwm pulse, and each pulsed drive controls opening or closing for the backlight of corresponding line.
In a preferred embodiment, the N of electric current when the driving current of multiple driving IC is driven normally for backlight
Times.
Below by taking the display panel of the backlight LED of 3200 subregions as an example, each subregion includes 16 LED, each subregion
The present embodiment is described further for driving current 20mA:
Again as shown in figure 3, the LED subregion in every row backlight increases switch controlling device all the way, control terminal can be used
The mode of mouth GPIO+PMOS pipe realizes that the specific circuit diagram of switch controlling device can be as shown in Figure 4.In the present embodiment, N takes
10, i.e., the LED subregion of every 10 row backlight is one group, realizes piece choosing by switch controlling device, takes the mode of PWM wave, will
Level is controlled in a drive cycle, the LED of same group of backlight of not going together is connected and is truncated respectively, i.e., the same drive
The individually drive control output all the way of dynamic IC may be implemented to carry out while controlling for the LED subregion of a line backlight, that is,
It says, the driving IC on 16 tunnels, the circuit provided through this embodiment, can be selected by piece and realize subregion drive control 10 of staggering the time
The LED of row backlight then drives IC usage quantity are as follows: 16 ÷ 10=20pcs of NUMIC=3200 ÷, it is seen then that quantity is than traditional
Drive control mode reduces 10 times.
Again as shown in figure 5, the LED of the present embodiment backlight drives, under GPIO mouthfuls of control port of control, every a line back
The driving current of the LED of light source is exported in 10% duty ratio.In a drive cycle, the LED of every a line backlight is driven
Level is arranged in pwm pulse, the switching of the LED array of the backlight of each pulsed drive corresponding line, in human eye afterglow effect
Interior (about 100ms---400ms), quickly successively opens and closes the LED array of one group of 10 row backlight, guarantees LED unit
Normal luminous reaches the normal display effect of LED.It can be seen from the figure that being compared with traditional LED drive control mode, often
The turn-on time of a subregion LED array is only the 1/10 of traditional LED drive control mode, in a drive cycle, driving
Electric current is successively multiplexed by the LED array of 10 row backlights, i.e., electric current has been re-used 10 times.
Since the driving current of original 10%, i.e. 10% × 20mA is used only in the backlight LED array of every row；And only reach
The driving current of 100% × 20mA inputs, and can be only achieved the display of maximum brightness.At this time, it is only necessary to promote the load of power supply power supply
10 times of current boost of the LED drive array of supply backlight can be realized in electric current, supply the LED hair of every row backlight in this way
The driving current of light unit is promoted to 10% × 20mA × 10=100% × 20mA, so that ensure that is reducing driving IC's
Meanwhile realizing the display effect of equivalent brightness.
The present embodiment also provides a kind of display device, including super more backlight subareas described in any one of above-mentioned technical proposal
Drive control circuit.
A specific embodiment of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.
Claims (4)
1. a kind of super more backlight subarea drive control circuits, which is characterized in that including multiple backlights, multiple driving IC and multiple
Switch controlling device, multiple backlights are divided into multiple groups, and each group of backlight connects in ranks form and by the same institute
State driving IC driving, wherein the line number of each group of backlight is N, the driving of the columns of each group of backlight and the driving IC
Number is identical, is equipped with the switch controlling device in every a line backlight, wherein each backlight in every a line backlight
Between the output end of the row switch controlling device and each road input terminal of driving IC, the switch controlling device is for single
All backlights for solely controlling the row are opened simultaneously or are closed；In the same drive cycle T, every a line in N row backlight
The time of switch controlling device closure is T/N, and there was only a line backlight institute therein in synchronization, N row backlight
Corresponding switch controlling device is in closed state.
2. super more backlight subarea drive control circuits according to claim 1, which is characterized in that the switch controlling device
Including GPIO mouthfuls of control port and PMOS tube, described GPI O mouthfuls connect with the grid of the PMOS tube, the source electrode of PMOS tube with should
Switch controlling device backlight connection of the row, the grounded drain of PMOS tube, under GPIO mouthfuls of control, driving current is with T/
The duty ratio PWM wave of N is exported, and in a drive cycle T, drive level is arranged in pwm pulse, and each pulsed drive
Control opening or closing for the backlight of corresponding line.
3. super more backlight subarea drive control circuits according to claim 1 or 2, which is characterized in that multiple drivings
N times of electric current when the driving current of IC is driven normally for backlight.
4. a kind of display device, which is characterized in that including the described in any item super more backlight subarea drive controls of claim 1-3
Circuit.
Priority Applications (1)
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| CN201910045174.2A CN109686319A (en) | 2019-01-17 | 2019-01-17 | The super more backlight subarea drive control circuits of one kind and display device |
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| CN201910045174.2A CN109686319A (en) | 2019-01-17 | 2019-01-17 | The super more backlight subarea drive control circuits of one kind and display device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110706658A (en) * | 2019-09-29 | 2020-01-17 | 苏州佳世达电通有限公司 | Backlight scanning type display method and backlight scanning type display system |
| CN111445867A (en) * | 2020-04-22 | 2020-07-24 | Tcl华星光电技术有限公司 | Backlight partition driving module, backlight device and display device |
| CN111599318A (en) * | 2020-05-29 | 2020-08-28 | 上海天马微电子有限公司 | Display device and driving method thereof |
| CN112969261A (en) * | 2021-02-06 | 2021-06-15 | 上海福宇龙汽车科技有限公司 | Time-sharing driving circuit and method for multiple paths of LED lamps |
| WO2021174805A1 (en) * | 2020-03-04 | 2021-09-10 | 深圳创维－Rgb电子有限公司 | Mini-led light source and driving circuit and driving method therefor |
| CN114333714A (en) * | 2021-12-31 | 2022-04-12 | 上海中航光电子有限公司 | Backlight module, dimming method thereof and display device |
| WO2023019650A1 (en) * | 2021-08-19 | 2023-02-23 | 武汉华星光电技术有限公司 | Backlight module and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110706658A (en) * | 2019-09-29 | 2020-01-17 | 苏州佳世达电通有限公司 | Backlight scanning type display method and backlight scanning type display system |
| WO2021174805A1 (en) * | 2020-03-04 | 2021-09-10 | 深圳创维－Rgb电子有限公司 | Mini-led light source and driving circuit and driving method therefor |
| CN111445867A (en) * | 2020-04-22 | 2020-07-24 | Tcl华星光电技术有限公司 | Backlight partition driving module, backlight device and display device |
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| CN114333714A (en) * | 2021-12-31 | 2022-04-12 | 上海中航光电子有限公司 | Backlight module, dimming method thereof and display device |
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