CN209657774U - Backlight regulating device - Google Patents
Backlight regulating device Download PDFInfo
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- CN209657774U CN209657774U CN201920366750.9U CN201920366750U CN209657774U CN 209657774 U CN209657774 U CN 209657774U CN 201920366750 U CN201920366750 U CN 201920366750U CN 209657774 U CN209657774 U CN 209657774U
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- light
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- modulating mode
- regulating device
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Abstract
It include: control signal generator, light-modulating mode selector, current controller and backlight driver the utility model discloses a kind of backlight regulating device, backlight driver is used for the selection signal exported according to light-modulating mode selector, is dimmed with mixing light-modulating mode or PWM light-modulating mode；And via at least one resistance eutral grounding in current controller, the first output electric current or the second output electric current are generated.Two kinds of light-modulating modes of dimming driver and two editions current switchings are effectively combined togather by the utility model, so that the problem that backlight driver is abnormal there is no display when having an operating current switching under any one light-modulating mode, ensure that image display quality.
Description
Technical field
The utility model relates to field of display technology, and in particular to a kind of backlight regulating device.
Background technique
The backlight adjusting method of display device includes simulation light modulation and digital dimming, and simulation light modulation is by adjusting being supplied to
The magnitude of current adjusting backlight luminance of each LED, digital dimming such as pulse width modulate (PWM, Pulse
WidthModulation it) dims, by adjusting the ratio adjusting backlight luminance of the switch time of LED.At present in narrow viewing angle technology
If the frequency (PWM frequency) of lower dim signal is lower than certain frequency, flashing caused by dimming is deposited with narrow viewing angle technology itself
Flashing superposition can show the obvious flashing that human eye can identify in display panel.
The prior art controls (CABC, Content Adaptive Backlight Control) method by dynamic backlight
The obvious flashing that human eye can identify is mitigated or eliminated in the frequency for improving dim signal.The backlight regulating circuit of the prior art includes phase
Sequence controller and the LED driving to connect, sequence controller frequency multiplication obtain the dim signal PWM of upper frequency, dim signal
PWM inputs LED driving, and the electric current setting end of LED driving connects resistance and controls and be arranged electric current ISET, and LED drives according to inside
Setting electric current ISET and dim signal PWM duty ratio obtain output electric current IOUTAnd then adjust backlight illumination.
Fig. 1 shows a kind of circuit diagram of backlight control circuit in the prior art, as shown in Figure 1, backlight control circuit packet
Include backlight driving chip U1 (such as RT8532), booster circuit and LED circuit.Wherein, in backlight driving chip have LX pin,
OVP pin, multiple LED pipe feet (in this example be six), VIN pin, EN pin (i.e. enable pin), PWM pin, MIX pin,
COMP pin, ISET pin, FREQ pin, AGND pin and PGND pin；Booster circuit is by power inductance L1, diode D1 group
At；LED circuit is made of multiple groups LED in parallel.LX pin is connected with booster circuit, and connect with LED circuit, steady to provide
Determine output voltage.LED circuit is connected with LED pipe foot.The end AGND and PGND ground connection.The outer connecting resistance R of COMPCOMP, capacitor CCAnd CCOMP
The compensation circuit of composition, for compensating booster circuit when dynamic regulation response.ISET pin is via resistance RISETAfter be grounded, be used for
LED current is set.FREQ pin is through resistance RFSWAfter be grounded, for be arranged switch frequency.PWM port from outside, (believe by number
Number) pwm signal (PWM Signal) is received, and receive the adjustable electric current to needed for itself after pwm signal.The end VIN
It connect with DC voltage VIN to power to chip, and through capacitor CINAfter be grounded so that voltage stabilization.OVP pin and resistance
ROVP1、ROVP2With capacitor COVPThe overvoltage crowbar of composition connects, and plays the role of overvoltage protection.MIX pin is for dimming mould
The selection of formula.What the voltage of the enable pin for being opened by control display backlight of electronic equipment display screen carried out, work as drawing
When the voltage of high enable pin, backlight is bright；When dragging down the voltage of enable pin, backlight is gone out.
In fact, backlight adjusting is required to can satisfy different operating current (such as 20mA with the development of technology, in system
And 6mA) switching.It and is in the prior art that there are this if used backlight driving chip (such as RT8532/RT8532A chip)
The problem of sample, for example, when driving the lamp string of 6*11: first, the PWM light-modulating mode of driver can be normal under the electric current of 6mA
Light modulation, but under the electric current of 20mA and low-voltage, it not can guarantee linearity light adjusting, the noise of display panel also can be larger at this time；The
Two, the mixing light-modulating mode of driver can be dimmed normally under the electric current of 20mA, but in the electric current of 6mA and low PWM duty
Than under (such as < 2%), system bit line can not start；Third, the analog dimming mode of driver low PWM duty cycle (as <
0.5%) can there are problems that backlight flicker under.
Utility model content
In order to solve the above-mentioned technical problem, the utility model provides a kind of backlight regulating device, efficiently utilizes drive
Two kinds of light-modulating modes of dynamic device, can satisfy the requirement of two editions current switchings in particular system, avoid existing dimming driver
External control circuit there are the problem of, ensure that image display quality.
According to a kind of backlight regulating device provided by the utility model characterized by comprising signal generator is used for
According to viewing angle control signal, first control signal and second control signal are exported；Light-modulating mode selector is generated with the signal
Device is connected, for receiving the first control signal, and according to the first control signal output mode selection signal；Electric current control
Device processed is connected with the signal generator, selects for receiving the second control signal, and according to the second control signal
At least one resistance and backlight driver, the backlight driver and the light-modulating mode selector and the circuit control
Device is connected, and the backlight driver receives the mode select signal, and according to the mode select signal with the first light modulation mould
Formula or the second light-modulating mode are dimmed, and generate the first output electric current or the second output electric current, wherein the first output electricity
Stream and the second output electric current are for adjusting backlight illumination.
Preferably, the backlight driver has the first functional pin and the second functional pin, first functional pin
It is connected with the light-modulating mode selector, for receiving the mode select signal；Second functional pin and at least one
Ground resistance is connected, and generates first output circuit or the second output electric current according to the number of the ground resistance.
Preferably, the first functional pin of the backlight driver is MIX pin, and the second functional pin is ISET pin.
Preferably, first light-modulating mode is mixing light-modulating mode, and second light-modulating mode is PWM light-modulating mode,
And the first output electric current is greater than the second output electric current.
Preferably, the control signal generator includes: viewing angle control signal input part, the viewing angle control signal input
It holds and is connect with the first output end of the control signal generator；First resistor and first switch tube, the first resistor and
The first switch tube is sequentially connected in series between the first power end and ground terminal, and the grid of the first switch tube and the view
The connection of angle control signal input, the drain electrode of the first switch tube and the second output terminal of the control signal generator connect
It connects.
Preferably, the first switch tube is NMOS transistor.
Preferably, the light-modulating mode selector includes: second resistance and second switch, the second resistance and
The second switch is sequentially connected in series between second source end and ground terminal, and the grid of the second switch and the control
First output end of signal generator processed connects, the drain electrode of the second switch and the output end of the light-modulating mode selector
Connection.
Preferably, the second switch is NMOS transistor.
Preferably, the current controller includes: 3rd resistor, one end of the 3rd resistor and the current controller
Output end connection, the other end connect with ground terminal；4th resistance and third switching tube, the 4th resistance and described
Three switching tubes are sequentially connected in series in the both ends of the 3rd resistor, and the grid of the third switching tube and the sequential control circuit
Second output terminal connection.
Preferably, the third switching tube is NMOS transistor.
The beneficial effects of the utility model are: being produced the utility model discloses a kind of backlight regulating device by control signal
It is controlled while the viewing angle control signal that raw device provides is to light-modulating mode and LED drive current, can need to carry out electricity in system
The operating current that road selects corresponding light-modulating mode different with correspondence when switching, it is in office to efficiently avoid existing backlight driver
There is a problem of showing exception when operating current switching under one light-modulating mode, optimizes circuit structure.
Detailed description of the invention
By referring to the drawings to the description of the utility model embodiment, above-mentioned and other mesh of the utility model
, feature and advantage will be apparent from.
Fig. 1 shows a kind of circuit diagram of backlight control circuit in the prior art；
Fig. 2 (a) and Fig. 2 (b) shows the system block diagram of the utility model embodiment backlight regulating device；
Fig. 3 shows the circuit structure diagram of the utility model embodiment backlight regulating device.
Specific embodiment
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The preferred embodiment of the utility model is given in attached drawing.But the utility model can be by different forms come real
It is existing, however it is not limited to embodiment described herein.Opposite, purpose of providing these embodiments is makes public affairs to the utility model
The understanding for opening content is more thorough and comprehensive.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Term used in the description of the utility model is intended merely to herein
The purpose of specific embodiment is described, it is not intended that in limitation the utility model.
In the following, the utility model is described in detail referring to attached drawing.
Fig. 2 shows that (a) and Fig. 2 (b) go out the system block diagram of the utility model embodiment backlight regulating device.
In conjunction with Fig. 2 (a) and Fig. 2 (b), in the utility model embodiment, backlight regulating device includes that control signal generates
Device 100, light-modulating mode selector 200, current controller 300 and backlight driver (such as LED driver) 400.
Signal generator 100 is controlled to be used to generate first control signal and second control signal according to viewing angle control signal.
Light-modulating mode selector 200 is connected with control signal generator 100, for receiving first control signal, and according to
First control signal output mode selection signal.
In the present embodiment, mode select signal includes the first dim signal and the second dim signal, and the first light modulation is believed
Number be high level signal, the second dim signal be low level signal.Light-modulating mode selector 200 is every time according to first control signal
Export one of the first dim signal and the second dim signal.
Current controller 300 is also connected with control signal generator 100, for according to second control signal selection at least one
A resistance, and it is connected to the grounding path of corresponding resistor.
Backlight driver 400 is connected with light-modulating mode selector 200 and current controller 300, receives light-modulating mode selection
The mode select signal that device 200 exports, and according to the first dim signal in mode select signal with the progress of the first light-modulating mode
Light modulation, or dimmed according to the second dim signal in mode select signal with the second light-modulating mode.Backlight driver 400 with
At least one ground resistance in current controller 300 is connected, and generates the first output electric current I according to the number of ground resistance1
(such as 20mA) and the second output electric current I2One of (such as 6mA).First output electric current and the second output electric current are for adjusting
Backlight illumination.
Preferably, in the present embodiment, the first output electric current is greater than the second output electric current.
Preferably, backlight driver selected in the present embodiment has PWM light-modulating mode (the second light-modulating mode) simultaneously
With mixing light-modulating mode (the first light-modulating mode).
In the present embodiment, backlight driver 400 has the first functional pin and the second functional pin, backlight driver 400
It is connected by the first functional pin reception pattern selection signal, and by the second functional pin at least one ground resistance.
Further, such as Fig. 2 (b), in the present embodiment, the first control signal generated according to viewing angle control signal HVA
Pass through light-modulating mode selector 200 and current controller 300 respectively with second control signal, while to backlight driver 400
Output electric current and light-modulating mode are controlled, for example, when first control signal control backlight driver 400 is with the first light-modulating mode
When (mixing light-modulating mode) is dimmed, second control signal can control backlight driver 400 with the first output electric current I1(such as
20mA) carry out output driving；When first control signal control backlight driver 400 is with the second light-modulating mode (PWM light-modulating mode)
When being dimmed, second control signal can control backlight driver 400 with the second output electric current I2(such as 6mA) carries out output drive
It is dynamic.
Backlight regulating device disclosed in the present embodiment, can be by a kind of same time control of control signal (such as viewing angle control signal)
The light-modulating mode and output electric current of backlight driver processed, efficiently avoid existing backlight driver under any one light-modulating mode
There is a problem of showing exception when operating current switching.
It is said below with reference to particular circuit configurations of the Fig. 3 to backlight regulating device in the utility model one embodiment
It is bright.
Fig. 3 shows the circuit structure diagram of the utility model embodiment backlight regulating device.
As shown in figure 3, in the utility model embodiment, control signal generator 100 includes first switch tube T1 and the
One resistance R1, first resistor R1 and first switch tube T1 are sequentially connected in series between the first power end VIN and ground terminal, first switch
Control terminal, that is, grid of pipe T1 is connected with the input terminal (HVA connector) of viewing angle control signal HVA.In control signal generator
In 100, the first output end of the grid of first switch tube T1 and control signal generator 100, the drain electrode of first switch tube T1 with
Control the second output terminal of signal generator 100.
Light-modulating mode selector 200 includes second switch T2 and second resistance R2, second resistance R2 and second switch
T2 is sequentially connected in series between second source end VLED and ground terminal, and the grid connection control signal generator of second switch T2
100 the first output end, the first functional pin (MIX pin) of the drain electrode connection backlight driver 400 of second switch T2.
Further, the MIX pin of backlight driver 400 can be used for the selection of light-modulating mode, such as when its pin is high electricity
Usually, backlight driver 400 is dimmed with the mixing light-modulating mode that PWM duty cycle is 25%；When its pin is low level,
Backlight driver 400 is dimmed with PWM light-modulating mode.
Current controller 300 includes third switch transistor T 3,3rd resistor R3 and the 4th resistance R4, the 4th resistance R4 and third
Switch transistor T 3 is sequentially connected in series between the second functional pin (ISET pin) and ground terminal of backlight driver 400, third switch
The grid of pipe T3 is connected with the second output signal of control signal generator, one end of 3rd resistor R3 and backlight driver 400
The second functional pin (ISET pin) connection, the other end connect with ground terminal.
It should be noted that only show the part-structure of backlight driver 400 in fig. 3, backlight driver it is specific
Structure can refer to attached drawing 1 and be understood.
Backlight driver 400 has PWM light-modulating mode and mixing light-modulating mode simultaneously in the present embodiment.Optionally, backlight
Driver 400 is RT8532 driving chip.
Preferably, first switch tube T1, second switch T2 and third switch transistor T 3 are NMOS transistor in the present embodiment.
The working principle of the utility model backlight regulating circuit is illustrated below:
When viewing angle control signal HVA is high level, control first switch tube T1 conducting controls signal generator at this time
100 the first output end exports high level signal, control second switch conducting, and the MIX pin of backlight driver 400 passes through the
Two switch transistor Ts 2 ground connection is low level, and the work of backlight driver 400 at this time is under PWM light-modulating mode；Signal generation is controlled simultaneously
The second output terminal of device 100 is grounded by first switch tube T1, exports low level, and further control third switch transistor T 3 is closed
Disconnected, the ISET pin of backlight driver 400 only passes through 3rd resistor R3 and is grounded, and output driving current is smaller (such as 6mA).
When viewing angle control signal HVA is low level, control first switch tube T1 shutdown controls signal generator at this time
100 the first output end exports low level signal, control second switch shutdown, and the MIX pin of backlight driver 400 passes through the
Two resistance R2 are connect with second source VLED, are high level, and the work of backlight driver 400 at this time is in the case where mixing light-modulating mode；Together
When control signal generator 100 second output terminal by first resistor R1 connection the first power supply VIN, output high level is gone forward side by side
One step controls third switch transistor T 3 and is connected, and the ISET pin of backlight driver 400 passes through in parallel 3rd resistor R3 and the at this time
Four resistance R4 ground connection, output driving current are larger (such as 20mA).
Further, in this embodiment the first power supply VIN will be fed driving chip prior to viewing angle control signal HVA, and open
The first power supply VIN can be high level always after machine, pass through the control voltage of change first switch tube T1 grid at this time, so that it may reach
To the purpose of on or off third switch transistor T 3, and then realize electric current setting.
To sum up, by the adjusting of the utility model embodiment Decision Making of Line Schemes, backlight driver may finally be realized in PWM tune
With 6mA output driving current when working under optical mode, and when mixing light-modulating mode work with turn of 20mA output driving current
It changes, avoiding existing backlight driver, there are show abnormal problem when operating current switching under any one light-modulating mode.
Optionally, backlight regulating device provided in the utility model embodiment can be adapted for the back such as Hewlett-Packard's system
Light is adjusted, while the backlight regulation scheme of other systems can also refer to the present embodiment and be realized.
It should be noted that herein, contained the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Finally, it should be noted that obviously, above-described embodiment is merely examples for clearly illustrating the present invention,
And it does not limit the embodiments.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.And thus
Changes and variations that derived from still in the protection scope of the utility model among.
Claims (10)
1. a kind of backlight regulating device characterized by comprising
Signal generator, for exporting first control signal and second control signal according to viewing angle control signal；
Light-modulating mode selector is connected with the signal generator, for receiving the first control signal, and according to described
One control signal output mode selection signal；
Current controller is connected with the signal generator, for receiving the second control signal, and according to second control
At least one resistance of signal behavior processed, and
Backlight driver, the backlight driver are connected with the light-modulating mode selector and the current controller, the back
CD-ROM driver receives the mode select signal, and according to the mode select signal with the first light-modulating mode or the second light modulation mould
Formula is dimmed, and generates the first output electric current or the second output electric current,
Wherein, the first output electric current and the second output electric current are for adjusting backlight illumination.
2. backlight regulating device according to claim 1, which is characterized in that the backlight driver has the function of that first draws
Foot and the second functional pin, first functional pin are connected with the light-modulating mode selector, for receiving the mode choosing
Select signal；Second functional pin is connected at least one ground resistance, and generates institute according to the number of the ground resistance
State the first output electric current or the second output electric current.
3. backlight regulating device according to claim 2, which is characterized in that the first functional pin of the backlight driver
For MIX pin, the second functional pin is ISET pin.
4. backlight regulating device according to claim 1, which is characterized in that first light-modulating mode is mixing light modulation mould
Formula, second light-modulating mode is PWM light-modulating mode, and the first output electric current is greater than the second output electric current.
5. backlight regulating device according to claim 1, which is characterized in that the control signal generator includes:
Viewing angle control signal input part, the first output end of the viewing angle control signal input part and the control signal generator
Connection；
First resistor, and
First switch tube, the first resistor and the first switch tube are sequentially connected in series between the first power end and ground terminal,
And the grid of the first switch tube is connect with the viewing angle control signal input part, the drain electrode of the first switch tube with it is described
Control the second output terminal connection of signal generator.
6. backlight regulating device according to claim 5, which is characterized in that the first switch tube is NMOS transistor.
7. backlight regulating device according to claim 1, which is characterized in that the light-modulating mode selector includes:
Second resistance, and
Second switch, the second resistance and the second switch are sequentially connected in series between second source end and ground terminal,
And the grid of the second switch is connect with the first output end of the control signal generator, the leakage of the second switch
Pole is connect with the output end of the light-modulating mode selector.
8. backlight regulating device according to claim 7, which is characterized in that the second switch is NMOS transistor.
9. backlight regulating device according to claim 1, which is characterized in that the current controller includes:
3rd resistor, one end of the 3rd resistor are connect with the output end of the current controller, and the other end and ground terminal connect
It connects；
4th resistance, and
Third switching tube, the 4th resistance and the third switching tube are sequentially connected in series in the both ends of the 3rd resistor, and institute
The grid for stating third switching tube is connect with the second output terminal of the signal generator.
10. backlight regulating device according to claim 9, which is characterized in that the third switching tube is NMOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920366750.9U CN209657774U (en) | 2019-03-21 | 2019-03-21 | Backlight regulating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920366750.9U CN209657774U (en) | 2019-03-21 | 2019-03-21 | Backlight regulating device |
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| Publication Number | Publication Date |
|---|---|
| CN209657774U true CN209657774U (en) | 2019-11-19 |
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ID=68527698
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920366750.9U Active CN209657774U (en) | 2019-03-21 | 2019-03-21 | Backlight regulating device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110910820A (en) * | 2019-12-20 | 2020-03-24 | 京东方科技集团股份有限公司 | Display driving method and device and display system |
| CN113160759A (en) * | 2021-03-31 | 2021-07-23 | 智道网联科技(北京)有限公司 | Display screen circuit selection method, intelligent networking equipment mainboard and electronic equipment |
| CN113192465A (en) * | 2021-03-30 | 2021-07-30 | 智道网联科技(北京)有限公司 | Display screen backlight circuit of intelligent network connection equipment and control method |
| CN116168654A (en) * | 2023-04-14 | 2023-05-26 | 杭州凡诺电子有限公司 | Display screen backlight control circuit, display screen and electronic equipment |
-
2019
- 2019-03-21 CN CN201920366750.9U patent/CN209657774U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110910820A (en) * | 2019-12-20 | 2020-03-24 | 京东方科技集团股份有限公司 | Display driving method and device and display system |
| CN113192465A (en) * | 2021-03-30 | 2021-07-30 | 智道网联科技(北京)有限公司 | Display screen backlight circuit of intelligent network connection equipment and control method |
| CN113160759A (en) * | 2021-03-31 | 2021-07-23 | 智道网联科技(北京)有限公司 | Display screen circuit selection method, intelligent networking equipment mainboard and electronic equipment |
| CN116168654A (en) * | 2023-04-14 | 2023-05-26 | 杭州凡诺电子有限公司 | Display screen backlight control circuit, display screen and electronic equipment |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee after: Kunshan Longteng Au Optronics Co Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee before: Kunshan Longteng Optronics Co., Ltd. |