WO2015081631A1 - 一种背光源驱动电路及液晶显示装置和驱动方法 - Google Patents
一种背光源驱动电路及液晶显示装置和驱动方法 Download PDFInfo
- Publication number
- WO2015081631A1 WO2015081631A1 PCT/CN2014/071052 CN2014071052W WO2015081631A1 WO 2015081631 A1 WO2015081631 A1 WO 2015081631A1 CN 2014071052 W CN2014071052 W CN 2014071052W WO 2015081631 A1 WO2015081631 A1 WO 2015081631A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- error
- reference voltage
- backlight
- amplification unit
- output
- Prior art date
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000003321 amplification Effects 0.000 claims abstract description 68
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 68
- 230000001960 triggered effect Effects 0.000 claims description 11
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0252—Improving the response speed
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
Definitions
- the present invention relates to a backlight driving technique for a display device, and more particularly to a backlight driving circuit, a liquid crystal display device, and a driving method. Background technique
- TFT LCD liquid crystal display devices stand out with their excellent performance and rapidly expand in various applications such as mobile phones, computers and televisions. Since the liquid crystal display device uses the liquid crystal which does not emit light to deflect under the influence of voltage to control the transmittance of the backlight and realize the image display function, improving the working performance of the backlight module is also an important research and development direction of the display technology.
- the mainstream liquid crystal display device manufacturer adopts a boost converter with a pulse width modulation dimming function as shown in FIG. 1 as a driving circuit of a backlight LED tube, providing an operating voltage for the LED tube and adjusting the working voltage. Size to control the brightness of the LED tube.
- the drive control unit is one of the key circuit units, and its function is to modulate the sawtooth wave signal according to the input control signal, thereby outputting a pulse width modulation dimming signal (referred to as a dimming signal) of a certain duty ratio.
- the dimming signal is used to modulate the voltage signal V in which the power source outputs to the LED lamp, and the modulated voltage signal V.
- Ut is loaded on the LED tube to drive its work.
- the voltage at the LED tube is collected as a feedback voltage V FB and supplied to the error amplifying unit located in the front stage of the drive control unit.
- the feedback voltage V FB is compared with a preset reference voltage V REF , and the comparison result is amplified by the error amplifying unit and supplied to the driving control unit as a control signal for adjusting the duty ratio of the dimming signal, thereby controlling
- the drive control unit outputs a dimming signal having a reasonable duty ratio to adjust the operating voltage V of the LED lamp.
- the purpose of ut .
- a liquid crystal display device needs to switch back and forth between different operating modes during display, providing a black pattern, a white pattern, and a gray scale pattern of various brightness, thus being a liquid crystal
- the display device displays that the LED tube providing the light source also needs to operate in different modes, such as a low loading mode when a pure black pattern is provided, a high loading mode when a white pattern is provided, and Provides an intermediate mode of grayscale images.
- the response rate (or response time) when the above mode is switched is a measurement display One of the important indicators of imaging performance.
- the present invention proposes a backlight driving circuit, a liquid crystal display device, and a driving method capable of adjusting a response rate for different load modes based on the prior art. Summary of the invention
- the present invention provides a backlight driving circuit, a liquid crystal display device, and a driving method capable of adjusting a response rate for different load modes.
- the backlight driving circuit includes: an error amplifying unit configured to receive a feedback voltage from the backlight, to compare the feedback voltage with a reference voltage, and adjust the location according to the size of the comparison result Amplifying the amplification result and the amplification speed, and outputting the amplification result as a control signal; and driving a control unit configured to receive a control signal from the error amplification unit for outputting a pulse width of the corresponding duty ratio according to the control signal
- the dimming signal is modulated to modulate the voltage signal that the power supply outputs to the backlight.
- the error amplifying unit includes a plurality of error amplifiers, and the comparing ends of the error amplifiers are coupled to each other to receive the feedback voltage, the reference terminal receives different reference voltages, and the reference voltage is multiplied by the reference voltage, and the output end is They are coupled to each other to output the control signal.
- the following relationships are met:
- P is an adjustment parameter greater than zero.
- the adjustment parameter p is equal to 0.1.
- the above error amplifiers can be mirrored.
- the above error amplifier can be a current amplifier.
- the backlight driving circuit described above may further include:
- the reference voltage generating unit is coupled to the error amplifying unit for supplying the reference voltage to the error amplifying unit.
- the present invention further provides a liquid crystal display device including a display panel and a backlight module, and the backlight module includes the backlight driving circuit.
- the present invention further provides a backlight driving method, comprising the following steps: collecting step: acquiring a backlight feedback voltage; comparing steps: comparing a backlight feedback voltage with a reference voltage; and amplifying step: adjusting according to the size of the comparison result
- the amplification factor and the amplification speed of the comparison result are output as the control signal.
- the output step is: outputting a pulse width modulation dimming signal of the corresponding duty ratio according to the control signal to modulate the voltage signal output from the power source to the backlight.
- the invention improves the existing backlight driving circuit, and adopts an error amplifying unit capable of automatically adjusting the amplification capability to replace the original error amplifying unit, thereby automatically adjusting the response rate in different load modes, which is compared with the prior art. Compared with, it has a faster response rate, which can indirectly enhance the animation display capability of the display device.
- FIG. 1 is a schematic structural view of a backlight module of a conventional liquid crystal display device
- FIG. 2 is a schematic structural diagram of a backlight module of an LED liquid crystal display device according to an embodiment of the present invention
- FIG. 3 is a circuit diagram of an error amplifying unit of a backlight driving circuit of the backlight module of FIG. Specific form
- the present invention improves the backlight driving circuit in the conventional liquid crystal display device, and changes the error amplifying unit in the original driving circuit into a kind An error amplifying unit that automatically adjusts the amplification capability.
- the backlight driving circuit provided by the present invention includes:
- An error amplifying unit configured to receive a feedback voltage from a backlight for comparing the feedback voltage with the reference Check the voltage, and according to the size of the comparison result, adjust the amplification factor and the amplification speed of the comparison result, and output the amplification result as a control signal;
- a driving control unit configured to receive a control signal from the error amplifying unit for outputting a pulse width modulation dimming signal of a corresponding duty ratio according to the control signal to modulate a voltage signal output by the power source to the backlight.
- the backlight module includes a backlight driving circuit 100, a plurality of LED tubes 200 arranged in parallel, and a power source 300.
- the backlight driving circuit 100 includes an error amplifying unit 10 and a driving control unit 20, wherein:
- the reference voltage generating unit internally generates a reference voltage V REF first . And then the reference voltage V REF .
- P is an adjustment parameter greater than zero, which can be set to 0.1 in this embodiment.
- 0P. + is a 20 ⁇ error amplifier, 0 ⁇ — ⁇ 0 ⁇ +1 is 30
- the ⁇ A error amplifier, 0P- 2 and 0P +2 is a 40 ⁇ A error amplifier.
- 0P- N , 0P + N uses (N+2) ⁇ 20 ⁇ ⁇ error amplifier.
- V FB When the load is unstable, V FB will increase or decrease instantaneously, where:
- the amplification factor is K.
- the amplifier is 0 ⁇ .
- the amplifier 0 ⁇ with the amplification factor is triggered simultaneously, and the corresponding current I is output separately.
- the sum of L and L is supplied to the drive control unit 20 as a control signal.
- the magnification factor is K. Error amplifier 0P.
- K +1 amplification factor error amplifier 0 ⁇ +1 and +2 amplification factor error amplifier K0 0? +2 are triggered simultaneously, outputs the corresponding current I. , 1 +1 and 1 +2 , current I.
- the sum of 1 +1 and 1 + 2 is supplied to the drive control unit 20 as a control signal.
- the feedback voltage V FB and the reference voltage V REF are compared to the reference voltage V REF .
- the larger the absolute value of the difference the stronger the amplification capability of the entire error amplifying unit 10, and the higher the amplification factor and the amplification speed, the stronger the control ability.
- the driving control unit 20 is coupled to the error amplifying unit 10, receives a control signal from the error amplifying unit 10, and modulates a sawtooth wave signal according to the control signal, and outputs a PWM dimming signal of a corresponding duty ratio.
- the PWM dimming signal is applied to the output of the power supply 300, and the voltage signal V in which the power supply 300 is output to the LED lamp 200 is modulated to modulate the voltage signal V.
- Ut is loaded on the LED tube 200 to drive the LED tube 200 to work.
- the sawtooth signal may be provided by a sawtooth signal generating unit 40, and the setting thereof Since it is prior art, it will not be described in detail here.
- the feedback voltage V FB received by the error amplifying unit 10 is the voltage at one of the plurality of LED tubes 200, so it is also necessary to set a voltage between the error amplifying unit 10 and the LED tube 200.
- the selecting unit 50 is configured to select a voltage at one LED tube from the plurality of LED tubes 200 as a feedback voltage V FB at one time, and provide the same to the error amplifying unit 10.
- the voltage selecting unit 50 need not be provided.
- the control signal from the error amplifying unit 10 controls the duty ratio of the dimming signal, and the duty ratio of the PWM dimming signal regulates the operating voltage V of the LED lamp 200.
- Ut the operating voltage V of the LED tube 200.
- Ut adjusts the operating brightness of the LED tube 200, so that the ability of the error amplifying unit 10 to control the output of the control signal affects the response rate of the display device.
- the voltage at one LED tube is supplied to the error amplifying unit 100 as the feedback voltage V FB at a certain timing. If the LED tube is in a stable operating state, only the amplification factor is K in the error amplifying unit 100. Amplifier 0P. Triggered, the corresponding current control signal I is output. The drive control unit 20 is provided; if the operating state of the LED lamp changes, the feedback voltage V FB is instantaneously greater than the reference voltage V REF . When the reference voltage is 10% exceeded, the amplification factor is K. The amplifier is 0 ⁇ . The amplifier 0 ⁇ +1 with the amplification factor ⁇ +1 is triggered at the same time, so the amplifier 0 ⁇ .
- the amplifier 0 ⁇ +1 works in conjunction with the amplifier 0 ⁇ +1 to quickly adjust the control signal output to the drive control unit, so there is a faster response rate; when the reference voltage is 20% exceeded, the amplification factor is ⁇ .
- the amplifier is 0 ⁇ .
- the amplification factor of the amplifier ⁇ +1 and 0 ⁇ ⁇ +2 amplification factor of the amplifier 0 ⁇ +2 are simultaneously triggered, whereby the amplifier 0 ⁇ .
- the amplifier 0 ⁇ and the amplifier 0 ⁇ +2 work together to quickly adjust the output signal to the drive control unit, so there is a faster response rate; and so on, the technical effect of grading the response rate can be achieved.
- the backlight driving circuit provided by the present invention can be based on the load feedback voltage v FB and a preset reference voltage V REF .
- the difference, triggering the corresponding number of amplifiers with corresponding gains, participates in error adjustment, so that the error adjustment capability can be adjusted for different situations, and then the response rate is adjusted to achieve differentiated processing.
- the present invention further provides a liquid crystal display device including a backlight module, wherein the backlight module is provided with a backlight driving circuit provided by the present invention to drive the backlight to operate.
- the present invention may also employ a voltage amplifier to constitute an error amplifying unit, and anyone skilled in the art is in the present invention. Variations or substitutions that are conceivable within the scope of the disclosed technology are intended to be encompassed within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
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- 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)
- Liquid Crystal (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/241,419 US9324277B2 (en) | 2013-12-06 | 2014-01-22 | Backlight driving circuit, liquid crystal display device and drive method |
KR1020167018196A KR102112384B1 (ko) | 2013-12-06 | 2014-01-22 | 백라이트 구동 회로, 액정 디스플레이 장치 및 이를 위한 구동 방법 |
JP2016536579A JP6309101B2 (ja) | 2013-12-06 | 2014-01-22 | バックライト駆動回路、液晶ディスプレイ装置および駆動方法 |
RU2016125790A RU2658799C2 (ru) | 2013-12-06 | 2014-01-22 | Возбуждающая схема подсветки, жидкокристаллическое дисплейное устройство и способ возбуждения |
GB1611711.1A GB2535962B (en) | 2013-12-06 | 2014-01-22 | Backlight driving circuit, liquid crystal display device and drive method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201310656726.6A CN103680422B (zh) | 2013-12-06 | 2013-12-06 | 一种背光源驱动电路及液晶显示装置和驱动方法 |
CN201310656726.6 | 2013-12-06 |
Publications (1)
Publication Number | Publication Date |
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WO2015081631A1 true WO2015081631A1 (zh) | 2015-06-11 |
Family
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Family Applications (1)
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PCT/CN2014/071052 WO2015081631A1 (zh) | 2013-12-06 | 2014-01-22 | 一种背光源驱动电路及液晶显示装置和驱动方法 |
Country Status (6)
Country | Link |
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JP (1) | JP6309101B2 (zh) |
KR (1) | KR102112384B1 (zh) |
CN (1) | CN103680422B (zh) |
GB (1) | GB2535962B (zh) |
RU (1) | RU2658799C2 (zh) |
WO (1) | WO2015081631A1 (zh) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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KR102349194B1 (ko) | 2014-11-21 | 2022-01-11 | 삼성디스플레이 주식회사 | 전원 공급 장치 및 이를 포함하는 표시 장치 |
CN105699915B (zh) * | 2016-02-02 | 2019-02-26 | 苏州美思迪赛半导体技术有限公司 | 一种开关电源自适应动态检测电路 |
CN105788559B (zh) | 2016-05-20 | 2018-10-30 | 深圳市华星光电技术有限公司 | 稳压装置 |
CN106658829B (zh) * | 2016-11-18 | 2018-05-22 | 佛山市谱德电子科技有限公司 | 一种背光源控制电路及显示装置 |
CN107170403B (zh) * | 2017-06-16 | 2020-09-15 | 北京小米移动软件有限公司 | 画面帧显示方法及装置 |
CN110687954B (zh) * | 2019-11-01 | 2021-12-14 | 上海艾为电子技术股份有限公司 | 背光芯片及屏幕补光电路 |
WO2022041074A1 (zh) * | 2020-08-27 | 2022-03-03 | 南京英维尔科技服务有限公司 | 一种头戴设备背光装置控制系统及终端 |
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- 2014-01-22 GB GB1611711.1A patent/GB2535962B/en active Active
- 2014-01-22 JP JP2016536579A patent/JP6309101B2/ja active Active
- 2014-01-22 RU RU2016125790A patent/RU2658799C2/ru active
- 2014-01-22 KR KR1020167018196A patent/KR102112384B1/ko active IP Right Grant
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Also Published As
Publication number | Publication date |
---|---|
GB2535962B (en) | 2020-11-25 |
KR20160100323A (ko) | 2016-08-23 |
JP6309101B2 (ja) | 2018-04-11 |
JP2017501540A (ja) | 2017-01-12 |
GB2535962A (en) | 2016-08-31 |
CN103680422B (zh) | 2016-02-03 |
GB201611711D0 (en) | 2016-08-17 |
RU2658799C2 (ru) | 2018-06-22 |
KR102112384B1 (ko) | 2020-05-18 |
CN103680422A (zh) | 2014-03-26 |
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