WO2022193359A1 - 一种背光驱动电路及液晶显示装置 - Google Patents

一种背光驱动电路及液晶显示装置 Download PDF

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Publication number
WO2022193359A1
WO2022193359A1 PCT/CN2021/083821 CN2021083821W WO2022193359A1 WO 2022193359 A1 WO2022193359 A1 WO 2022193359A1 CN 2021083821 W CN2021083821 W CN 2021083821W WO 2022193359 A1 WO2022193359 A1 WO 2022193359A1
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WIPO (PCT)
Prior art keywords
transistor
light
backlight
liquid crystal
electrically connected
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Application number
PCT/CN2021/083821
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English (en)
French (fr)
Inventor
刘金风
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Tcl华星光电技术有限公司
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Priority to US17/281,633 priority Critical patent/US11978409B2/en
Publication of WO2022193359A1 publication Critical patent/WO2022193359A1/zh

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Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/3406Control of illumination source
    • G09G3/342Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/024Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/08Details of timing specific for flat panels, other than clock recovery
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0257Reduction of after-image effects
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0261Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0626Adjustment of display parameters for control of overall brightness
    • G09G2320/064Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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 using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3648Control of matrices with row and column drivers using an active matrix

Definitions

  • the present application relates to the field of display technology, and in particular, to a backlight driving circuit and a liquid crystal display device.
  • the inventor of the present application found that the passive matrix mini light-emitting diode (Passive Matrix Mini Light Emitting Diode) light-emitting diode, PMMini-led) products, driven by single-point static control, by letting the backlight follow the liquid crystal panel (opencell, OC) The method of lighting up row by row can realize the backlight after the liquid crystal is in a steady state. Because the backlight is not lit, the process of liquid crystal scanning and flipping cannot be detected by the human eye, which achieves the purpose of improving smearing.
  • Passive Matrix Mini Light Emitting Diode Passive Matrix Mini Light Emitting Diode
  • PMMini-led liquid crystal panel
  • the backlight of Active Matrix Mini light-emitting diode (AMMini-led) products is the same as that of OC, and they are all driven by scanning.
  • the capacitor is charged.
  • the thin film transistor Thin Film Transistor, TFT
  • the capacitor will maintain the potential at this time, so that the driving transistor will continue to be turned on, and the LED will remain on.
  • the TFT is turned on to change the capacitance charge until the next frame is scanned. Therefore, it is impossible to turn off the LEDs of the previous row while lighting a row, that is, the backlight cannot be turned on row by row following the OC. Therefore, the tailing problem of active matrix products is difficult to improve.
  • the drain of the first transistor is grounded, the source of the first transistor is electrically connected to the second node, and the gate of the first transistor is connected to a reset signal;
  • the scan signal in the scan phase, is at a high level, and the reset signal is at a low level.
  • the anode of the light-emitting device is connected to a power supply signal, and the cathode of the light-emitting device is electrically connected to the drain of the driving transistor;
  • the data signal is output to the second node, and the driving transistor drives the light-emitting device to emit light;
  • the charge of the storage capacitor is released to reset the light-emitting device.
  • the first transistor, the second transistor, and the driving transistor are all oxide semiconductor thin film transistors.
  • the first transistor, the second transistor and the driving transistor are all amorphous silicon thin film transistors.
  • the present application also provides a liquid crystal display device, comprising a backlight module, an array substrate, a color filter substrate, and a liquid crystal layer disposed between the array substrate and the color filter substrate, and the backlight module is disposed on the a side of the array substrate away from the liquid crystal layer, the backlight module is provided with a plurality of rows of backlight units, and the backlight units include a driving transistor, a first transistor, a second transistor, a storage capacitor and a light-emitting device;
  • the drain of the driving transistor is electrically connected to the light-emitting device, the source of the driving transistor is electrically connected to the first node, and the gate of the driving transistor is electrically connected to the second node;
  • the backlight driving circuit corresponding to the liquid crystal in the n+1 th row when the backlight driving circuit corresponding to the liquid crystal in the n+1 th row is in the scanning phase, the backlight corresponding to the liquid crystal in the n th row is in the scanning stage.
  • the drive circuit is in the reset phase.
  • each row of the liquid crystal corresponds to 80 to 120 rows of the backlight units.
  • the data signal is output to the second node, and the driving transistor drives the light-emitting device to emit light;
  • the charge of the storage capacitor is released to reset the light-emitting device.
  • the scan signal in the reset phase, is at a low level, and the reset signal is at a high level.
  • the first transistor, the second transistor and the driving transistor are all low temperature polysilicon thin film transistors, oxide semiconductor thin film transistors or amorphous silicon thin film transistors.
  • the backlight driving circuit adopted in this application adds a first transistor and a reset signal.
  • the on-off of the second transistor is controlled by the scan signal to charge the storage capacitor, and the on-off of the first transistor is controlled by the reset signal to release the charge in the storage capacitor.
  • the liquid crystal display device using the backlight driving circuit of the present application can realize that the backlight is individually lit row by row, thereby improving the display smearing problem of the liquid crystal display device.
  • FIG. 1 is a schematic circuit diagram of a backlight driving circuit provided by the present application.
  • FIG. 2 is a timing diagram of a backlight driving circuit provided by the present application.
  • FIG. 4 is a schematic diagram of the path of the backlight driving circuit provided by the present application in the reset stage under the driving sequence shown in FIG. 2;
  • FIG. 6 is a timing diagram of a driving circuit of the backlight module provided by the present application.
  • the source and drain of the transistor used in this application are symmetrical, the source and drain thereof are interchangeable.
  • one electrode is called the source electrode, and the other electrode is called the drain electrode.
  • the transistors used in the present application may include P-type transistors and/or N-type transistors, wherein the P-type transistor is turned on when the gate is at a low level and turned off when the gate is at a high level, and the N-type transistor is when the gate is at a low level. It is turned on when the gate is high and turned off when the gate is low.
  • the present application provides a backlight driving circuit and a liquid crystal display device. Each of them will be described in detail below. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.
  • FIG. 1 is a schematic circuit diagram of a backlight driving circuit provided by the present application.
  • the present application provides a backlight driving circuit 100 , which includes a driving transistor DT, a first transistor T1 , a second transistor T2 , a storage capacitor C and a light-emitting device D.
  • the light-emitting device D may be a light-emitting diode (LED), a mini light-emitting diode (Mini light-emitting diode) diode, Mini LED) or micro light-emitting diode (Micro light-emitting diode, Micro LED).
  • LED light-emitting diode
  • Mini LED mini light-emitting diode
  • Micro LED micro light-emitting diode
  • the drain of the driving transistor DT is electrically connected to the light emitting device D.
  • the source of the driving transistor DT is electrically connected to the first node a.
  • the gate of the driving transistor DT is electrically connected to the second node b.
  • the drain of the first transistor T1 is grounded.
  • the source of the first transistor T1 is electrically connected to the second node b.
  • the gate of the first transistor T1 is connected to the reset signal Re.
  • the source of the second transistor T2 is connected to the data signal Da.
  • the drain of the second transistor T2 is electrically connected to the second node b.
  • the gate of the second transistor T2 is connected to the scan signal G.
  • the first end of the storage capacitor C is electrically connected to the first node a.
  • the driving transistor DT is used to control the current flowing through the light-emitting device D.
  • the first transistor T1 is used to discharge the charge of the storage capacitor C under the control of the reset signal Re.
  • the second transistor T2 is used for outputting the data signal Da to the second node b under the control of the scan signal G.
  • the backlight driving circuit 100 provided by the present application adds a first transistor T1 and a reset signal Re.
  • the on-off of the second transistor T2 is controlled by the scan signal G to charge the storage capacitor C
  • the on-off of the first transistor T1 is controlled by the reset signal Re to discharge the charge in the storage capacitor C.
  • the driving transistor DT, the first transistor T1 and the second transistor T2 are all low temperature polysilicon thin film transistors, oxide semiconductor thin film transistors or amorphous silicon thin film transistors.
  • the transistors in the backlight driving circuit 100 provided by the present application are all of the same type of transistors, so as to avoid the influence of the differences between different types of transistors on the backlight driving circuit 100 .
  • the present application adds a first transistor T1 to the backlight driving circuit 100 with a 2T1C (two transistors and one storage capacitor) structure, and the first transistor T1 can release the charge in the storage capacitor C under the control of the reset signal Re. .
  • the present application adopts the backlight driving circuit 100 of the 3T1C structure to drive the light emission of the light emitting device D, uses fewer components, has a simple and stable structure, and saves costs.
  • the present application only needs to add one transistor to control the charge of the storage capacitor, realize row-by-row lighting, optimize the circuit design, and simplify the circuit structure.
  • the data signal Da is output to the second node b
  • the driving transistor DT is turned on
  • the light-emitting circuit is turned on
  • the light-emitting device D emits light.
  • the reset phase t2 the charge of the storage capacitor C is released, and the light-emitting device D is reset.
  • the gate-source voltage Vgs of the driving transistor DT is greater than the threshold voltage Vth, the driving transistor DT is turned on, the power signal VDD supplies power to the light-emitting device D, and the current is transmitted to the light-emitting device through the anode of the light-emitting device D.
  • the cathode of D, the light-emitting device D emits light.
  • the gate-source voltage Vgs of the driving transistor DT refers to the potential difference between the second node b and the first node a, that is, the voltage difference between the gate of the driving transistor DT and the source of the driving transistor DT.
  • the reset signal Re is at a high level
  • the first transistor T1 is turned on, and both the first and second ends of the storage capacitor C are grounded, so that the storage capacitor C is discharged to the ground and the charge in the storage capacitor C is cleared.
  • the potential of the second node b drops, and the gate-source voltage Vgs of the driving transistor DT is lower than the threshold voltage Vth. Therefore, the driving transistor DT is turned off, the current loop of the light emitting device D is turned off, and the light emitting device D stops emitting light.
  • FIG. 5 is a schematic structural diagram of the liquid crystal display device provided by the present application.
  • the liquid crystal display device 1000 includes a backlight module 10 , an array substrate 20 , a color filter substrate 40 , and a liquid crystal layer 30 disposed between the array substrate 20 and the color filter substrate 40 .
  • the backlight module 10 is disposed on the side of the array substrate 20 away from the liquid crystal layer 30 , and the liquid crystal layer 30 includes multiple rows of liquid crystals 30 a.
  • the backlight module 10 is provided with a plurality of rows of backlight units, and the backlight units include the backlight driving circuits described in the above embodiments, and the backlight driving circuits are not shown in FIG. 5 .
  • the liquid crystal display device 1000 may further include pixel electrodes, common electrodes or other devices. The specific arrangement and assembly of the liquid crystal display device 1000 are technical means well known to those skilled in the art, and will not be repeated here.
  • each row of liquid crystals 30a in the liquid crystal layer 30 corresponds to 80 to 120 rows of backlight units. That is, each row of liquid crystals 30a in the liquid crystal layer 30 corresponds to 80 to 120 rows of backlight driving circuits. Specifically, each row of liquid crystals 30a in the liquid crystal layer 30 corresponds to 80 rows, 90 rows, 100 rows, 110 rows or 120 rows of backlight driving circuits. Each row of liquid crystals 30a in the liquid crystal layer 30 in the present application corresponds to 80 to 120 rows of backlight driving circuits, which can make the liquid crystal display device 1000 of the present application adapt to the needs of different pixel resolutions, so that the liquid crystal display device 1000 has greater applications market.
  • the liquid crystal display device 1000 provided by the present application adopts a backlight driving circuit, and the backlight driving circuit adds a first transistor and a reset signal.
  • the on-off of the second transistor T2 is controlled by the scan signal to charge the storage capacitor, and the on-off of the first transistor is controlled by the reset signal to release the charge in the storage capacitor.
  • the liquid crystal display device 1000 provided by the present application adopts the backlight driving circuit, which can make the backlight follow the line-by-line deflection of the liquid crystal 30a and light up line by line, thereby improving the problem of display smearing.
  • the liquid crystal display device 1000 includes multiple rows of backlight units, G1, G2, G3...Gn represent the scanning signals G corresponding to each row of backlight units, R1, R2, R3... Set signal Re.
  • the scanning signal G is at a high level, and the reset signal Re is at a low level.
  • the liquid crystal 30a in the first row of the liquid crystal layer 30 is deflected.
  • the scanning signal G1 of the first row is at a high level.
  • the reset signal Re of the corresponding row backlight unit is at a low level, the first transistor T1 is turned off, and the charge in the storage capacitor C will not flow out.
  • the backlight unit of the corresponding row is turned on, and the first row of images of the liquid crystal display device 1000 is displayed.
  • the scan signal G is at a low level
  • the reset signal Re is at a high level.
  • the scanning signal G1 of the backlight unit corresponding to the liquid crystal 30a in the first row is at a low level
  • the backlight of the backlight unit corresponding to the liquid crystal 30a in the first row is at a low level.
  • the second transistor T2 in the driving circuit 100 is turned off and stops transmitting the data signal Da to the second node b.
  • the potential of the second node b drops, and the gate-source voltage Vgs of the driving transistor DT in the backlight driving circuit 100 of the backlight unit corresponding to the first row of liquid crystals 30a is lower than the threshold voltage Vth. Therefore, the driving transistor DT is turned off, the current loop of the light emitting device D in the backlight driving circuit 100 of the backlight unit corresponding to the first row of liquid crystals 30a is turned off, and the light emitting device D stops emitting light. At this time, the backlight unit corresponding to the first row of liquid crystals 30a is turned off, and the display of the first row of the liquid crystal display device 1000 stops.
  • the backlight unit corresponding to the liquid crystal 30a in the first row While the backlight unit corresponding to the liquid crystal 30a in the first row is in the reset phase t2, the backlight unit corresponding to the liquid crystal 30a in the second row enters the scanning phase.
  • the backlight can be turned on after the liquid crystal is deflected to a steady state; on the other hand, the backlight unit can be turned on line by line following the line-by-line deflection of the liquid crystal 30a, thereby improving the LCD device 1000 when displaying images. Smearing problem, improve product quality and improve display effect.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

一种背光驱动电路(100)及液晶显示装置(1000),能够实现背光逐行单独点亮,改善显示拖尾的问题。其中,背光驱动电路(100)增加了一个第一晶体管(T1)和一个重置信号(Re),通过扫描信号(G)控制第二晶体管(T2)的通断,对存储电容(C)充电,并通过重置信号(Re)控制第一晶体管(T1)的通断,对存储电容(C)中的电荷进行释放。

Description

一种背光驱动电路及液晶显示装置 技术领域
本申请涉及显示技术领域,具体涉及一种背光驱动电路及液晶显示装置。
背景技术
液晶显示器(Liquid Crystal Display, LCD)是通过电压控制液晶的翻转角度来控制屏幕显示不同画面的,然而在越来越高刷新率的应用下,在液晶翻转的过程中,若液晶翻转还未到达稳态时背光常亮,人眼就会看到拖尾的问题。
在对现有技术的研究和实践过程中,本申请的发明人发现,被动矩阵式迷你发光二极管(Passive Matrix Mini light-emitting diode, PMMini-led)产品,以单点静态控制的方式驱动,通过让背光跟随液晶面板(opencell, OC)逐行点亮的方式,可以实现让液晶转到稳态后再开启背光。液晶扫描翻转的过程因为背光未被点亮,故人眼无法察觉得到,达到了改善拖尾的目的。
而主动矩阵式迷你发光二极管(Active Matrix Mini light-emitting diode, AMMini-led)产品的背光与OC相同,都是扫描式驱动的。每行背光扫描时,给电容充电,充电完毕后,薄膜晶体管(Thin Film Transistor, TFT)会关断,此时电容保持电位,让驱动晶体管持续导通,LED一直点亮。每行背光打开后直到下一帧扫完后再打开TFT改变电容电荷。故无法实现在点亮某行的同时,让上一行的LED熄灭,即无法让背光跟随OC逐行开启,因此,主动矩阵式产品的拖尾问题难以改善。
技术问题
本申请提供一种背光驱动电路及液晶显示装置,可以实现背光逐行开启,进而改善液晶显示装置显示时的拖尾问题。
技术解决方案
本申请提供一种背光驱动电路,包括驱动晶体管、第一晶体管、第二晶体管、存储电容以及发光器件;
所述驱动晶体管的漏极与所述发光器件电性连接,所述驱动晶体管的源极电性连接于第一节点,所述驱动晶体管的栅极电性连接于第二节点;
所述第一晶体管的漏极接地,所述第一晶体管的源极电性连接于所述第二节点,所述第一晶体管的栅极接入重置信号;
所述第二晶体管的源极接入数据信号,所述第二晶体管的漏极电性连接于所述第二节点,所述第二晶体管的栅极接入扫描信号;
所述存储电容的第一端电性连接于所述第一节点,所述存储电容的第二端电性连接于所述第二节点;
所述发光器件的阳极接入电源信号,所述发光器件的阴极与所述驱动晶体管的漏极电性连接。
可选的,在本申请的一些实施例中,所述背光驱动电路的驱动时序包括:
扫描阶段,将所述数据信号输出至所述第二节点,所述驱动晶体管驱动所述发光器件发光;
重置阶段,释放所述存储电容的电荷,对所述发光器件进行重置。
可选的,在本申请的一些实施例中,在所述扫描阶段,所述扫描信号为高电平,所述重置信号为低电平。
可选的,在本申请的一些实施例中,在所述重置阶段,所述扫描信号为低电平,所述重置信号为高电平。
可选的,在本申请的一些实施例中,所述第一晶体管、所述第二晶体管以及所述驱动晶体管均为低温多晶硅薄膜晶体管、氧化物半导体薄膜晶体管或非晶硅薄膜晶体管。
可选的,在本申请的一些实施例中,所述发光器件为发光二极管、迷你发光二极管或微型发光二极管中的一种或多种。
相应的,本申请还提供一种背光驱动电路,包括驱动晶体管、第一晶体管、第二晶体管、存储电容以及发光器件,其中,所述发光器件为发光二极管、迷你发光二极管以及微型发光二极管中的一种或多种;
所述驱动晶体管的漏极与所述发光器件电性连接,所述驱动晶体管的源极电性连接于第一节点,所述驱动晶体管的栅极电性连接于第二节点;
所述第一晶体管的漏极接地,所述第一晶体管的源极电性连接于所述第二节点,所述第一晶体管的栅极接入重置信号;
所述第二晶体管的源极接入数据信号,所述第二晶体管的漏极电性连接于所述第二节点,所述第二晶体管的栅极接入扫描信号;
所述存储电容的第一端电性连接于所述第一节点,所述存储电容的第二端电性连接于所述第二节点;
所述发光器件的阳极接入电源信号,所述发光器件的阴极与所述驱动晶体管的漏极电性连接;
所述背光驱动电路的驱动时序包括:
扫描阶段,将所述数据信号输出至所述第二节点,所述驱动晶体管驱动所述发光器件发光;
重置阶段,释放所述存储电容的电荷,对所述发光器件进行重置。
可选的,在本申请的一些实施例中,在所述扫描阶段,所述扫描信号为高电平,所述重置信号为低电平,在所述重置阶段,所述扫描信号为低电平,所述重置信号为高电平。
可选的,在本申请的一些实施例中,所述第一晶体管、所述第二晶体管以及所述驱动晶体管均为低温多晶硅薄膜晶体管。
可选的,在本申请的一些实施例中,所述第一晶体管、所述第二晶体管以及所述驱动晶体管均为氧化物半导体薄膜晶体管。
可选的,在本申请的一些实施例中,所述第一晶体管、所述第二晶体管以及所述驱动晶体管均为非晶硅薄膜晶体管。
相应的,本申请还提供一种液晶显示装置,包括背光模组、阵列基板、彩膜基板以及设置于所述阵列基板和所述彩膜基板之间的液晶层,所述背光模组设置在所述阵列基板远离所述液晶层的一侧,所述背光模组上设置有多行背光单元,所述背光单元包括驱动晶体管、第一晶体管、第二晶体管、存储电容以及发光器件;
所述驱动晶体管的漏极与所述发光器件电性连接,所述驱动晶体管的源极电性连接于第一节点,所述驱动晶体管的栅极电性连接于第二节点;
所述第一晶体管的漏极接地,所述第一晶体管的源极电性连接于所述第二节点,所述第一晶体管的栅极接入重置信号;
所述第二晶体管的源极接入数据信号,所述第二晶体管的漏极电性连接于所述第二节点,所述第二晶体管的栅极接入扫描信号;
所述存储电容的第一端电性连接于所述第一节点,所述存储电容的第二端电性连接于所述第二节点;
所述发光器件的阳极接入电源信号,所述发光器件的阴极与所述驱动晶体管的漏极电性连接。
可选的,在本申请的一些实施例中,所述背光驱动电路的驱动时序包括扫描阶段和重置阶段,在所述扫描阶段,所述液晶层中的第n行液晶发生偏转,所述第n行液晶偏转稳定后,所述背光驱动电路驱动所述背光模组中对应行的所述背光单元发光,在所述重置阶段,释放所述背光驱动电路存储的电荷,关闭所述第n行液晶对应的背光单元,其中,n为1以上的正整数。
可选的,在本申请的一些实施例中,其中,在所述第n+1行液晶对应的所述背光驱动电路处于所述扫描阶段时,所述第n行液晶对应的的所述背光驱动电路处于所述重置阶段。
可选的,在本申请的一些实施例中,每行所述液晶对应80行至120行所述背光单元。
可选的,在本申请的一些实施例中,所述背光驱动电路的驱动时序包括:
扫描阶段,将所述数据信号输出至所述第二节点,所述驱动晶体管驱动所述发光器件发光;
重置阶段,释放所述存储电容的电荷,对所述发光器件进行重置。
可选的,在本申请的一些实施例中,在所述扫描阶段,所述扫描信号为高电平,所述重置信号为低电平。
可选的,在本申请的一些实施例中,在所述重置阶段,所述扫描信号为低电平,所述重置信号为高电平。
可选的,在本申请的一些实施例中,所述第一晶体管、所述第二晶体管以及所述驱动晶体管均为低温多晶硅薄膜晶体管、氧化物半导体薄膜晶体管或非晶硅薄膜晶体管。
可选的,在本申请的一些实施例中,所述发光器件为发光二极管、迷你发光二极管或微型发光二极管中的一种或多种。
本申请采用的背光驱动电路增加了一个第一晶体管和一个重置信号。通过扫描信号控制第二晶体管的通断,对存储电容充电,并通过重置信号控制第一晶体管的通断,对存储电容中的电荷进行释放。采用本申请的背光驱动电路的液晶显示装置能够实现背光逐行单独点亮,改善液晶显示装置的显示拖尾的问题。
附图说明
为了更清楚地说明本申请中的技术方案,下面将对实施例描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本申请的一些实施例,对于本领域技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1是本申请提供的背光驱动电路的一种电路示意图;
图2是本申请提供的背光驱动电路的时序图;
图3是本申请提供的背光驱动电路在图2所示的驱动时序下的扫描阶段的通路示意图;
图4是本申请提供的背光驱动电路在图2所示的驱动时序下的重置阶段的通路示意图;
图5是本申请提供的液晶显示装置的一种结构示意图;
图6是本申请提供的背光模组的一种驱动电路时序图。
本发明的实施方式
下面将结合本申请中的附图,对本申请中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本申请一部分实施例,而不是全部的实施例。基于本申请中的实施例,本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本申请保护的范围。此外,应当理解的是,此处所描述的具体实施方式仅用于说明和解释本申请,并不用于限制本申请。在本申请中,在未作相反说明的情况下,使用的方位词如“上”和“下”通常是指装置实际使用或工作状态下的上和下,具体为附图中的图面方向;而“内”和“外”则是针对装置的轮廓而言的。
需要说明的是,由于本申请采用的晶体管的源极、漏极是对称的,所以其源极、漏极是可以互换的。在本申请中,为区分晶体管除栅极之外的两极,将其中一极称为源极,另一极称为漏极。此外本申请所采用的晶体管可以包括P型晶体管和/或N型晶体管两种,其中,P型晶体管在栅极为低电平时导通,在栅极为高电平时截止,N型晶体管为在栅极为高电平时导通,在栅极为低电平时截止。
本申请提供一种背光驱动电路及液晶显示装置。以下分别进行详细说明。需说明的是,以下实施例的描述顺序不作为对实施例优选顺序的限定。
请参阅图1,图1是本申请提供的背光驱动电路的一种电路示意图。本申请提供一种背光驱动电路100,包括驱动晶体管DT、第一晶体管T1、第二晶体管T2、存储电容C以及发光器件D。发光器件D可以是发光二极管(light-emitting diode, LED)、迷你发光二极管(Mini light-emitting diode, Mini LED)或微型发光二极管(Micro light-emitting diode, Micro LED)。
驱动晶体管DT的漏极与发光器件D电性连接。驱动晶体管DT的源极电性连接于第一节点a。驱动晶体管DT的栅极电性连接于第二节点b。第一晶体管T1的漏极接地。第一晶体管T1的源极电性连接于第二节点b。第一晶体管T1的栅极接入重置信号Re。第二晶体管T2的源极接入数据信号Da。第二晶体管T2的漏极电性连接于第二节点b。第二晶体管T2的栅极接入扫描信号G。存储电容C的第一端电性连接于第一节点a。存储电容C的第二端电性连接于第二节点b。发光器件D的阳极接入电源信号VDD。发光器件D的阴极与驱动晶体管DT的漏极电性连接。
具体的,驱动晶体管DT用于控制流经发光器件D的电流。第一晶体管T1用于在重置信号Re的控制下,释放存储电容C的电荷。第二晶体管T2用于在扫描信号G的控制下,将数据信号Da输出至第二节点b。
本申请提供的背光驱动电路100增加了一个第一晶体管T1和一个重置信号Re。通过扫描信号G控制第二晶体管T2的通断,对存储电容C充电,并通过重置信号Re控制第一晶体管T1的通断,对存储电容C中的电荷进行释放。采用本申请的背光驱动电路100能够实现背光逐行单独点亮,改善显示拖尾的问题。
在一些实施例中,驱动晶体管DT、第一晶体管T1以及第二晶体管T2均为低温多晶硅薄膜晶体管、氧化物半导体薄膜晶体管或非晶硅薄膜晶体管。本申请提供的背光驱动电路100中的晶体管均为同一种类型的晶体管,从而避免不同类型的晶体管之间的差异性对背光驱动电路100造成的影响。
本申请在2T1C(2个晶体管以及1个存储电容)结构的背光驱动电路100基础上增加了一个第一晶体管T1,第一晶体管T1在重置信号Re的控制下可释放存储电容C中的电荷。本申请采用3T1C结构的背光驱动电路100对发光器件D的发光进行驱动,用了较少的元器件,结构简单稳定,节约了成本。并且,本申请只需要增加一个晶体管便可控制存储电容的电荷,实现逐行点亮,优化了电路设计,简化了电路结构。
请参阅图2,图2为本申请提供的背光驱动电路的时序图。背光驱动电路100的驱动时序包括扫描阶段t1和重置阶段t2。扫描信号G和重置信号Re相组合先后对应背光驱动电路100的不同阶段。
具体的,在扫描阶段t1,数据信号Da输出至第二节点b,驱动晶体管DT打开,发光回路导通,发光器件D发光。在重置阶段t2,释放存储电容C的电荷,对发光器件D进行重置。
在一些实施例中,在扫描阶段t1,扫描信号G为高电平,重置信号Re为低电平。具体的,请同时参阅图2和图3,图3是本申请提供的背光驱动电路在图2所示的驱动时序下的扫描阶段的通路示意图。其中,在扫描阶段t1,扫描信号G为高电平,此时第二晶体管T2打开,数据信号Da写入至第二节点b,并向存储电容C充电。此时,重置信号Re为低电平,第一晶体管T1关闭,存储电容C中的电荷不会流出。由于第二节点b的电位被拉高,驱动晶体管DT的栅源电压Vgs大于阈值电压Vth,驱动晶体管DT打开,电源信号VDD向发光器件D供电,则电流通过发光器件D的阳极传输至发光器件D的阴极,发光器件D发光。
其中,驱动晶体管DT的栅源电压Vgs是指第二节点b与第一节点a之间的电位差,也就是驱动晶体管DT的栅极与驱动晶体管DT的源极之间的电压差。
在一些实施例中,在重置阶段t2,扫描信号G为低电平,重置信号Re为高电平。具体的,请同时参阅图2和图4,图4是本申请提供的背光驱动电路在图2所示的驱动时序下的重置阶段的通路示意图。其中,在重置阶段t2,扫描信号G为低电平,第二晶体管T2关闭,停止将数据信号Da输送至第二节点b。此时,重置信号Re为高电平,第一晶体管T1打开,存储电容C的第一端和第二端均接地,使得存储电容C对地放电,存储电容C中的电荷清零。第二节点b的电位下降,驱动晶体管DT的栅源电压Vgs小于阈值电压Vth。因此,驱动晶体管DT关闭,发光器件D的电流回路截止,发光器件D停止发光。
本申请提供一种液晶显示装置,请参阅图5,图5是本申请提供的液晶显示装置的一种结构示意图。该液晶显示装置1000包括背光模组10、阵列基板20、彩膜基板40以及设置于阵列基板20和彩膜基板40之间的液晶层30。背光模组10设置在阵列基板20远离液晶层30的一侧,液晶层30包括多行液晶30a。背光模组10上设置有多行背光单元,背光单元包括上述各实施例所述的背光驱动电路,图5中未示出背光驱动电路。其中,液晶显示装置1000还可以包括像素电极、公共电极或其他装置,液晶显示装置1000的具体设置方式及装配是本领域技术人员所熟知的技术手段,在此不再赘述。
其中,液晶层30中的每行液晶30a对应80行至120行的背光单元。即液晶层30中的每行液晶30a对应80行至120行的背光驱动电路。具体的,液晶层30中的每行液晶30a对应80行、90行、100行、110行或120行背光驱动电路。本申请中的液晶层30中的每行液晶30a对应80行至120行背光驱动电路,可以使本申请的液晶显示装置1000适应不同像素分辨率的需求,使液晶显示装置1000具有更大的应用市场。
本申请提供的液晶显示装置1000采用一种背光驱动电路,该背光驱动电路增加了一个第一晶体管和一个重置信号。通过扫描信号控制第二晶体管T2的通断,对存储电容充电,并通过重置信号控制第一晶体管的通断,对存储电容中的电荷进行释放。本申请提供的液晶显示装置1000采用该背光驱动电路,能够使背光跟随液晶30a逐行偏转而逐行点亮,改善显示拖尾的问题。
请参阅图6,图6是本申请提供的背光模组的一种驱动电路时序图。下面结合图5和图6进行说明。背光驱动电路的驱动时序包括扫描阶段t1和重置阶段t2。在扫描阶段t1,液晶层30中的第n行液晶30a发生偏转,第n行液晶30a偏转稳定后,背光驱动电路驱动背光模组中对应的背光单元发光。在重置阶段t2,释放背光驱动电路存储的电荷,关闭第n行液晶对应的背光单元。其中,n为1以上的正整数。其中,在第n+1行液晶30a对应的背光驱动电路处于扫描阶段t1时,第n行液晶30a对应的背光驱动电路处于重置阶段t2。
需要说明的是,图6所指示的扫描阶段t1和重置阶段t2是对应第一行扫描信号G1和第一行重置信号R1,并且对应示出了其他行扫描信号和重置信号在该阶段的电位情况。
本申请以第一行和第二行液晶30a对应的背光单元为例进行说明,首先在扫描阶段t1,对第一行液晶30a对应的背光单元进行扫描充电。当液晶层30的第一行液晶30a翻转完成,处于稳定状态时,第一行液晶30a对应的背光单元充电完成,第一行液晶30a对应的背光单元发光。此时第一行画面进行显示。然后第一行液晶30a对应的背光单元进入重置阶段t2,存储电容C中的电荷被清除,第一行液晶30a对应的背光单元停止发光,第一行画面停止显示。与此同时,对第二行液晶30a对应的背光单元进行扫描充电。当液晶层30的第二行液晶30a翻转完成,处于稳定状态时,第二行液晶30a对应的背光单元充电完成,第二行液晶30a对应的背光单元发光。此时第二行画面进行显示。
由此,在实现第n行背光单元点亮时,其他行背光单元均为熄灭状态,也就是逐行显示。逐行显示可保证液晶显示装置1000在液晶30a翻转过程中不进行显示,从而有效改善显示画面拖尾的问题。
需要说明的是,液晶显示装置1000包括多行背光单元,G1、G2、G3……Gn表示每行背光单元对应的扫描信号G,R1、R2、R3……Rn表示每行背光单元对应的重置信号Re。
具体的,请同时参阅图1、图2、图5以及图6。在扫描阶段t1时,扫描信号G为高电平,重置信号Re为低电平。在扫描阶段t1,在像素电极和公共电极的驱动下,液晶层30中的第一行液晶30a发生偏转,当像素电极和公共电极之间的电压到达预设值,第一行液晶30a偏转稳定。同时,第一行扫描信号G1为高电平,此时对应行背光单元的背光驱动电路100中第二晶体管T2打开,数据信号Da写入至第二节点b,并向背光驱动电路100中的存储电容C充电。此时,第二节点b的电位不断抬升,当驱动晶体管DT的栅源电压Vgs大于阈值电压Vth时,驱动晶体管DT打开,电源信号VDD向对应行背光单元中的发光器件D供电,发光器件D发光。另外,此时对应行背光单元的重置信号Re为低电平,第一晶体管T1关闭,存储电容C中的电荷不会流出。此时,对应行背光单元打开,液晶显示装置1000的第一行画面进行显示。
其中,驱动晶体管DT的栅源电压Vgs是指第二节点b与第一节点a之间的电位差,也就是驱动晶体管DT的栅极与驱动晶体管DT的源极之间的电压差。
需要说明的是,液晶层30中的其他行液晶30a对应的背光单元在扫描阶段t1依次进入上述过程,在此不再赘述。
在一些实施例中,在重置阶段t2,扫描信号G为低电平,重置信号Re为高电平。结合图1、图2、图5以及图6所示,在重置阶段t2,第一行液晶30a对应的背光单元的扫描信号G1为低电平,第一行液晶30a对应的背光单元的背光驱动电路100中第二晶体管T2关闭,并停止将数据信号Da输送至第二节点b。并且,第一行液晶30a对应的背光单元的重置信号R1为高电平,第一行液晶30a对应的背光单元的背光驱动电路100中第一晶体管T1打开,第一行液晶30a对应的背光单元的背光驱动电路100中存储电容C的第一端和第二端均接地,使得存储电容C对地放电,存储电容C中的电荷清零。第二节点b的电位下降,第一行液晶30a对应的背光单元的背光驱动电路100中驱动晶体管DT的栅源电压Vgs小于阈值电压Vth。因此,驱动晶体管DT关闭,第一行液晶30a对应的背光单元的背光驱动电路100中发光器件D的电流回路截止,发光器件D停止发光。此时,第一行液晶30a对应的背光单元关闭,液晶显示装置1000的第一行画面停止显示。
需要说明的是,液晶层30中的其他行液晶30a对应的背光单元在重置阶段t2依次进入上述过程,在此不再赘述。
第一行液晶30a对应的背光单元处于重置阶段t2的同时,第二行液晶30a对应的背光单元进入扫描阶段。如此循环往复,一方面,可以实现在液晶偏转到稳态后再开启背光;另一方面,能够使背光单元跟随液晶30a逐行偏转而逐行打开,从而改善液晶显示装置1000在显示画面时的拖尾问题,提升产品品位,改善显示效果。
并且,在相关技术中,主动矩阵式液晶显示装置若需要进行逐行点亮,通常是整屏扫描之后,再进行逐行显示。而本申请提供的液晶显示装置1000,实现了逐行扫描和逐行点亮,能够减小功耗,减低充电时间,扩大产品应用场景。
本申请的液晶显示装置1000可应用于主动矩阵式发光二极管背光液晶显示器、主动矩阵式迷你发光二极管背光液晶显示器或主动矩阵式微型发光二极管背光液晶显示器。该液晶显示装置1000可以为手机、平板电脑、笔记本、游戏机、数码相机、车载导航仪、电子广告牌、自动取款机等具有显示功能的电子设备。
以上对本申请所提供的一种背光驱动电路及液晶显示装置进行了详细介绍,本文中应用了具体个例对本申请的原理及实施方式进行了阐述,以上实施例的说明只是用于帮助理解本申请的方法及其核心思想;同时,对于本领域的技术人员,依据本申请的思想,在具体实施方式及应用范围上均会有改变之处,综上所述,本说明书内容不应理解为对本申请的限制。

Claims (20)

  1. 一种背光驱动电路,其中,包括驱动晶体管、第一晶体管、第二晶体管、存储电容以及发光器件;
    所述驱动晶体管的漏极与所述发光器件电性连接,所述驱动晶体管的源极电性连接于第一节点,所述驱动晶体管的栅极电性连接于第二节点;
    所述第一晶体管的漏极接地,所述第一晶体管的源极电性连接于所述第二节点,所述第一晶体管的栅极接入重置信号;
    所述第二晶体管的源极接入数据信号,所述第二晶体管的漏极电性连接于所述第二节点,所述第二晶体管的栅极接入扫描信号;
    所述存储电容的第一端电性连接于所述第一节点,所述存储电容的第二端电性连接于所述第二节点;
    所述发光器件的阳极接入电源信号,所述发光器件的阴极与所述驱动晶体管的漏极电性连接。
  2. 根据权利要求1所述的背光驱动电路,其中,所述背光驱动电路的驱动时序包括:
    扫描阶段,将所述数据信号输出至所述第二节点,所述驱动晶体管驱动所述发光器件发光;
    重置阶段,释放所述存储电容的电荷,对所述发光器件进行重置。
  3. 根据权利要求2所述的背光驱动电路,其中,在所述扫描阶段,所述扫描信号为高电平,所述重置信号为低电平。
  4. 根据权利要求2所述的背光驱动电路,其中,在所述重置阶段,所述扫描信号为低电平,所述重置信号为高电平。
  5. 根据权利要求1所述的背光驱动电路,其中,所述第一晶体管、所述第二晶体管以及所述驱动晶体管均为低温多晶硅薄膜晶体管、氧化物半导体薄膜晶体管或非晶硅薄膜晶体管。
  6. 根据权利要求1所述的背光驱动电路,其中,所述发光器件为发光二极管、迷你发光二极管以及微型发光二极管中的一种或多种。
  7. 一种背光驱动电路,其中,包括驱动晶体管、第一晶体管、第二晶体管、存储电容以及发光器件,其中,所述发光器件为发光二极管、迷你发光二极管以及微型发光二极管中的一种或多种;
    所述驱动晶体管的漏极与所述发光器件电性连接,所述驱动晶体管的源极电性连接于第一节点,所述驱动晶体管的栅极电性连接于第二节点;
    所述第一晶体管的漏极接地,所述第一晶体管的源极电性连接于所述第二节点,所述第一晶体管的栅极接入重置信号;
    所述第二晶体管的源极接入数据信号,所述第二晶体管的漏极电性连接于所述第二节点,所述第二晶体管的栅极接入扫描信号;
    所述存储电容的第一端电性连接于所述第一节点,所述存储电容的第二端电性连接于所述第二节点;
    所述发光器件的阳极接入电源信号,所述发光器件的阴极与所述驱动晶体管的漏极电性连接;
    所述背光驱动电路的驱动时序包括:
    扫描阶段,将所述数据信号输出至所述第二节点,所述驱动晶体管驱动所述发光器件发光;
    重置阶段,释放所述存储电容的电荷,对所述发光器件进行重置。
  8. 根据权利要求7所述的背光驱动电路,其中,在所述扫描阶段,所述扫描信号为高电平,所述重置信号为低电平,在所述重置阶段,所述扫描信号为低电平,所述重置信号为高电平。
  9. 根据权利要求7所述的背光驱动电路,其中,所述第一晶体管、所述第二晶体管以及所述驱动晶体管均为低温多晶硅薄膜晶体管。
  10. 根据权利要求7所述的背光驱动电路,其中,所述第一晶体管、所述第二晶体管以及所述驱动晶体管均为氧化物半导体薄膜晶体管。
  11. 根据权利要求7所述的背光驱动电路,其中,所述第一晶体管、所述第二晶体管以及所述驱动晶体管均为非晶硅薄膜晶体管。
  12. 一种液晶显示装置,其中,包括背光模组、阵列基板、彩膜基板以及设置于所述阵列基板和所述彩膜基板之间的液晶层,所述背光模组设置在所述阵列基板远离所述液晶层的一侧,所述背光模组上设置有多行背光单元,所述背光单元包括驱动晶体管、第一晶体管、第二晶体管、存储电容以及发光器件;
    所述驱动晶体管的漏极与所述发光器件电性连接,所述驱动晶体管的源极电性连接于第一节点,所述驱动晶体管的栅极电性连接于第二节点;
    所述第一晶体管的漏极接地,所述第一晶体管的源极电性连接于所述第二节点,所述第一晶体管的栅极接入重置信号;
    所述第二晶体管的源极接入数据信号,所述第二晶体管的漏极电性连接于所述第二节点,所述第二晶体管的栅极接入扫描信号;
    所述存储电容的第一端电性连接于所述第一节点,所述存储电容的第二端电性连接于所述第二节点;
    所述发光器件的阳极接入电源信号,所述发光器件的阴极与所述驱动晶体管的漏极电性连接。
  13. 根据权利要求12所述的液晶显示装置,其中,所述背光驱动电路的驱动时序包括扫描阶段和重置阶段,在所述扫描阶段,所述液晶层中的第n行液晶发生偏转,所述第n行液晶偏转稳定后,所述背光驱动电路驱动所述背光模组中对应的所述背光单元发光,在所述重置阶段,释放所述背光驱动电路存储的电荷,关闭所述第n行液晶对应的背光单元,其中,n为1以上的正整数。
  14. 根据权利要求13所述的液晶显示装置,其中,在所述第n+1行液晶对应的所述背光驱动电路处于所述扫描阶段时,所述第n行液晶对应的所述背光驱动电路处于所述重置阶段。
  15. 根据权利要求13所述的液晶显示装置,其中,每行所述液晶对应80行至120行所述背光单元。
  16. 根据权利要求12所述的液晶显示装置,其中,所述背光驱动电路的驱动时序包括:
    扫描阶段,将所述数据信号输出至所述第二节点,所述驱动晶体管驱动所述发光器件发光;
    重置阶段,释放所述存储电容的电荷,对所述发光器件进行重置。
  17. 根据权利要求16所述的液晶显示装置,其中,在所述扫描阶段,所述扫描信号为高电平,所述重置信号为低电平。
  18. 根据权利要求16所述的液晶显示装置,其中,在所述重置阶段,所述扫描信号为低电平,所述重置信号为高电平。
  19. 根据权利要求12所述的液晶显示装置,其中,所述第一晶体管、所述第二晶体管以及所述驱动晶体管均为低温多晶硅薄膜晶体管、氧化物半导体薄膜晶体管或非晶硅薄膜晶体管。
  20. 根据权利要求12所述的液晶显示装置,其中,所述发光器件为发光二极管、迷你发光二极管以及微型发光二极管中的一种或多种。
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