WO2010095819A2 - 전류소모가 적은 액정디스플레이 구동회로 - Google Patents
전류소모가 적은 액정디스플레이 구동회로 Download PDFInfo
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- WO2010095819A2 WO2010095819A2 PCT/KR2010/000557 KR2010000557W WO2010095819A2 WO 2010095819 A2 WO2010095819 A2 WO 2010095819A2 KR 2010000557 W KR2010000557 W KR 2010000557W WO 2010095819 A2 WO2010095819 A2 WO 2010095819A2
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- voltage
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- liquid crystal
- crystal display
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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
- G09G3/36—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 using liquid crystals
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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
- G09G3/36—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 using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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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
- G09G3/36—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 using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
Definitions
- the present invention relates to a liquid crystal display driving circuit, and more particularly, to a liquid crystal display driving circuit having a low current consumption that can reduce a current consumed during a charging and discharging process when driving a liquid crystal display.
- a liquid crystal display refers to a device in which image data is displayed by passing light through a liquid crystal using a feature in which arrangement states of liquid crystal molecules vary according to an applied voltage.
- the current consumption is one of the most important factors.
- the temperature of the liquid crystal display driving circuit and the system is increased, thereby increasing the reliability and lifespan of the liquid crystal display driving circuit and the system. It can be shortened.
- an increase in current consumption in the liquid crystal display driving circuit and system applied to the portable device shortens the use time of the battery, thereby reducing the use time of the entire portable device.
- FIG. 1 is a view showing a current consumption process of driving a panel of a liquid crystal display driving circuit according to the prior art.
- the LCD driving circuit In order to drive a liquid crystal display panel, the LCD driving circuit must drive a data line of the liquid crystal display panel, and current consumption occurs in this process.
- the data line of the liquid crystal display panel becomes an R / C load composed of a resistor and a capacitor in an equivalent circuit, and the LCD driving circuit charges the R / C load in order to drive the liquid crystal display panel. (charging) and discharging (dis-charging).
- the liquid crystal display driving circuit when it is necessary to drive a level higher than the previous level, the liquid crystal display driving circuit should receive the charge at the first voltage VDD to charge the R / C load and drive the level lower than the previous level. In this case, the liquid crystal display driving circuit needs to discharge the charges charged in the R / C load through the second voltage VSS.
- the driving circuit drives the liquid crystal display panel by using the conventional technology
- the charge supplied from the first voltage VDD is used only once and flows to the second voltage VSS
- the liquid crystal display is driven. Increasing the current consumption of the drive circuit and system, thereby causing a rise in temperature.
- the battery life can be shortened by reducing the battery usage time. It acts as a shortening factor.
- the technical problem to be solved by the present invention is to further include an intermediate voltage terminal in the output buffer of the liquid crystal display driving circuit to reduce the current consumption by using the charge discarded in the discharge process of the first buffer in the charging process of the second buffer.
- the present invention provides a liquid crystal display driving circuit with low current consumption.
- a liquid crystal display driving circuit having a low current consumption includes a first voltage (VDD) terminal, a second voltage (VSS) terminal, and an intermediate voltage (V) in a driving circuit of a liquid crystal display panel.
- the liquid crystal display driving circuit with low current consumption increases the reliability and lifespan of the liquid crystal display driving circuit and system by reducing the consumption current and the temperature in the liquid crystal display driving circuit and the system, and is applied to the liquid crystal display driving circuit applied to portable devices. There is an effect that can increase the battery life of the furnace and system.
- FIG. 1 is a view showing a current consumption process of driving a panel of a liquid crystal display driving circuit according to the prior art.
- FIG. 2 is a block diagram showing the configuration of a liquid crystal display driving circuit with low current consumption according to the present invention.
- FIG. 3 is a view showing a current consumption reduction method of the liquid crystal display driving circuit with low current consumption according to the present invention.
- FIG. 4 is a view showing a range of driving voltages of the liquid crystal display driving circuit with low current consumption according to the present invention.
- FIG. 5 is a circuit diagram illustrating an embodiment of an intermediate voltage (V COM ) generation unit of a liquid crystal display driving circuit having low current consumption according to the present invention.
- FIG. 6 is a view showing a method of sharing the output terminal of the liquid crystal display driving circuit with low current consumption according to the present invention.
- FIG. 7 is a view showing a method of sharing the input terminal of the liquid crystal display driving circuit with low current consumption according to the present invention.
- FIG. 8 is a view showing the current consumption reduction effect of the liquid crystal display driving circuit with low current consumption according to the present invention.
- FIG. 9 is a view showing a temperature reduction effect of the liquid crystal display driving circuit with low current consumption according to the present invention.
- the output buffer of the liquid crystal display driving circuit includes a first voltage (VDD) terminal and a second voltage (VSS) terminal and further includes an intermediate voltage terminal (V COM ) to discharge the first buffer.
- VDD first voltage
- VSS second voltage
- V COM intermediate voltage terminal
- the present invention proposes a method for minimizing current consumption when the liquid crystal display driving circuit drives the liquid crystal display panel.
- FIG. 2 is a block diagram showing the configuration of a liquid crystal display driving circuit with low current consumption according to the present invention.
- the liquid crystal display driving circuit having low current consumption includes a first buffer 210, a second buffer 220, a first switch 230, and a second switch 240.
- the first buffer 210 is a buffer for driving the positive voltage level of the liquid crystal display panel and includes a first voltage VDD terminal that is an upper voltage level and a second voltage VSS terminal that is a lower voltage level.
- An intermediate voltage (V COM ) terminal is provided as an intermediate level voltage. At this time, the intermediate voltage V COM terminal is connected to a discharging path of the first buffer 210.
- the first buffer 210 is a buffer for outputting a positive voltage, which is a voltage having a magnitude greater than the center voltage based on a constant center voltage, and the positive voltage level is an intermediate voltage V COM . It corresponds to the range from to the first voltage VDD.
- the second buffer 220 is a buffer for driving a negative voltage level of the liquid crystal display panel and includes a first voltage VDD terminal that is an upper voltage level and a second voltage VSS terminal that is a lower voltage level.
- An intermediate voltage (V COM ) terminal is provided as an intermediate level voltage. At this time, the intermediate voltage V COM terminal is connected to a charging path of the second buffer 220.
- the second buffer 220 is a buffer for outputting a negative voltage, which is a voltage having a magnitude smaller than the center voltage, based on a constant center voltage, and the negative voltage level is from 2 voltages (VSS). It corresponds to the range up to the intermediate voltage (V COM ).
- the second buffer When the first buffer is driven at the positive voltage level, the second buffer is driven at the negative voltage level, and when the first buffer is driven at the negative voltage level, the second buffer is driven at the positive voltage level.
- the intermediate voltage V COM has a voltage level within the range of the first voltage VDD and the second voltage VSS, and supplies a voltage to operate the first buffer 210 and the second buffer 220. do.
- the intermediate voltage V COM is a dis-charging path and a second buffer of the first buffer 210. It is connected to the charging path of 220 and serves to share the discharging path of the first buffer and the charging path of the second buffer.
- the terminal for supplying the voltage at which the buffer can operate is composed of only two of the first voltage VDD terminal and the second voltage VSS terminal.
- the buffer and the second buffer operate with three voltage terminals of the first voltage VDD terminal, the second voltage VSS terminal, and the intermediate voltage V COM terminal.
- the first switch 230 is a switch for transmitting the input signal (Even_input, Odd_input) to the first buffer 210 and the second buffer 220 and for the polarity inversion to prevent the solidification phenomenon of the liquid crystal display panel It can also be used.
- the second switch 240 is a switch that connects the output signals (Even_output, Odd_output) of the first buffer 210 and the second buffer 220 to the data lines of the liquid crystal display panel, and prevents the solidification of the liquid crystal display panel. It can also be used for polarity reversal.
- the first switch 230 and the second switch 240 cross or shift the inputs of the first buffer 210 and the second buffer 220 to each other, thereby polarizing the liquid crystal display panel. Can be reversed.
- FIG. 3 is a view showing a current consumption reduction process of the liquid crystal display driving circuit with low current consumption according to the present invention.
- the input signal Even_input of the first buffer 210 receives a higher input than the previous input signal, and the first buffer 210 receives electric charge from the first voltage VDD terminal, thereby receiving a liquid crystal display.
- the R / C load of the data line of the panel is charged and driven, and the second buffer 220 receives an input signal Odd_input lower than the previous input signal, thereby receiving a data line of the liquid crystal display panel. It is driven by discharging the electric charge charged in the R / C Load at the second voltage (VSS) terminal.
- the input signal Even_input of the first buffer 210 receives an input lower than that of the previous input signal and is charged in the R / C load of the data line of the liquid crystal display panel.
- the charge is discharged through the intermediate voltage (V COM ) terminal, and the second buffer 220 receives the input signal (Odd_input) higher than the previous input signal and receives the charge from the intermediate voltage (V COM ) terminal to receive the liquid crystal display panel. It is driven by charging R / C Load of Data Line.
- the intermediate voltage (V COM ) terminal connects the discharge path of the first buffer 210 and the charging path of the second buffer 220 to each other, and the data line of the data line connected to the first buffer 210.
- the current consumption can be reduced by using the charge discharged from the R / C Load to charge the R / C Load of the data line connected to the second buffer 220.
- FIG. 4 is a view showing a range of driving voltages of the liquid crystal display driving circuit with low current consumption according to the present invention.
- the first buffer is driven in the range from the first voltage VDD to the intermediate voltage V COM
- the second buffer is in the range from the intermediate voltage V COM to the second voltage VSS. It can be seen that the drive.
- FIG. 5 is a circuit diagram illustrating an embodiment of an intermediate voltage generator of a liquid crystal display driving circuit with low current consumption according to the present invention.
- the intermediate voltage V COM generating unit of the liquid crystal display driving circuit having low current consumption may include a first resistor R1 having one end connected to a first voltage VDD terminal, and one terminal of the first resistor R1 connected to the first voltage VDD terminal.
- the second resistor R2 connected to the other terminal of the resistor R1 and the other terminal connected to the second voltage VSS, and the common terminal of the first resistor R1 and the second resistor R2 are non- And an operational amplifier (Amp.) Input to the inverting terminal and whose output terminal is connected to the inverting terminal.
- the intermediate voltage (V) of the liquid crystal display driving circuit used in the present invention is generated by dividing the voltage by adjusting the first resistor (R1) or the second resistor (R2) to generate an intermediate voltage and buffering it through the operational amplifier.
- COM the intermediate voltage
- the operational amplifier (Amp.) Use a unit gain buffer having a voltage gain of 1.
- FIG. 6 is a view showing a method of sharing the output terminal of the buffer in the liquid crystal display driving circuit with low current consumption according to the present invention.
- the first and second buffers include an inverter at an input terminal, an inverter and a bias stage at an output terminal.
- the first buffer 210 operates between the first voltage VDD and the second voltage VSS and inverts the input signal by the first input terminal inverter 211 and the first voltage VDD.
- a first output terminal inverter 212 and the first voltage (VDD) and the second voltage to operate between the intermediate voltage (V COM ) and to invert the output of the first input terminal inverter 211 again.
- a first bias stage 213 that operates between (VSS) and applies a bias voltage to the first output stage inverter 212.
- the second buffer 220 is operated between the first voltage VDD and the second voltage VSS, and the second input terminal inverter 221 and the intermediate voltage V COM for inverting the input signal.
- a second output stage inverter 222 and the first voltage VDD and the second voltage which operate between the second voltage VSS and invert the output of the second input stage inverter 221 again.
- a second bias stage 223 that operates between (VSS) and applies a bias voltage to the second output stage inverter 222.
- the first output terminal inverter 212 of the first buffer 210 and the second output terminal inverter 222 of the second buffer 220 are shared through the intermediate voltage V COM .
- FIG. 7 is a view showing a method of sharing the input terminal of the buffer in the liquid crystal display driving circuit with low current consumption according to the present invention.
- the first and second buffers include an inverter at an input terminal, an inverter and a bias stage at an output terminal.
- the first buffer 210 operates between the first voltage VDD and the intermediate voltage V COM , and includes a first input terminal inverter 211 and the first voltage VDD which invert the input signal. And a first output terminal inverter 212 and the first voltage VDD and the intermediate voltage V operating between the second voltage VSS and inverting the output of the first input terminal inverter 211 again. COM ) and a first bias stage 213 for applying a bias voltage to the first output stage inverter 212.
- the second buffer 220 may operate between the intermediate voltage V COM and the second voltage VSS, and may include a second input terminal inverter 221 and the first voltage VDD to invert the input signal. ) And a second output terminal inverter 222 and the intermediate voltage V COM and the second voltage operating between the second voltage VSS and inverting the output of the second input terminal inverter 221 again. And a second bias stage 223 that operates between (VSS) and applies a bias voltage to the second output stage inverter 222.
- the first input stage inverter 211 and the first bias stage 213 of the first buffer 210 and the second input stage inverter 221 and the second bias stage 223 of the second buffer 220 are intermediate. It can be seen that the voltage V COM is shared.
- FIG. 8 is a view showing the current consumption reduction effect of the liquid crystal display driving circuit with a low current consumption according to the present invention
- Figure 9 is a view showing the temperature reduction effect of the liquid crystal display driving circuit that can reduce the current consumption according to the present invention to be.
- the current consumption of the liquid crystal display driving circuit and the system was verified through simulation, and as shown in FIG. The same data drive pattern was used.
- FIG. 9 is a view showing a simulation result of a temperature reduction effect using a liquid crystal display driving circuit having 720 buffers as a model. have.
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Abstract
Description
Claims (20)
- 액정디스플레이 구동회로에 있어서,제1전압(VDD) 단자, 제2전압(VSS) 단자 및 상기 제1전압(VDD)과 상기 제2전압(VSS)의 중간전압(VCOM) 단자를 구비하고 상기 제1전압(VDD) 내지 상기 중간전압(VCOM)의 범위 내에서 구동되는 제1버퍼; 및상기 제1전압(VDD) 단자, 상기 제2전압(VSS) 단자 및 상기 중간전압(VCOM) 단자를 구비하고 상기 중간전압(VCOM) 내지 상기 제2전압(VSS)의 범위 내에서 구동되는 제2버퍼;를 구비하고,상기 제1버퍼의 중간전압(VCOM) 단자와 상기 제2버퍼의 중간전압(VCOM)단자는 서로 연결되어 있으며,상기 제1전압(VDD)은 가장 높은 전압이고, 상기 제2전압(VSS)은 가장 낮은 전압 이며, 중간전압(VCOM)은 상기 제1전압(VDD)과 상기 제2전압(VSS)의 범위 내에 있는 것을 특징으로 하는 전류소모가 적은 액정 디스플레이 구동 회로.
- 제1항에 있어서,상기 제1버퍼가 포지티브 전압레벨인 상기 제1전압(VDD) 내지 상기 중간전압(VCOM)에서 구동되는 경우 상기 제2버퍼는 네가티브 전압레벨인 상기 중간전압(VCOM) 내지 상기 제2전압(VSS)에서 구동되고,상기 제1버퍼가 네가티브 전압레벨인 상기 중간전압(VCOM) 내지 상기 제2전압(VSS)에서 구동되는 경우 상기 제2버퍼는 포지티브 전압레벨인 상기 제1전압(VDD) 내지 상기 중간전압(VCOM)에서 구동되는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제2항에 있어서, 상기 중간전압(VCOM)은상기 제1버퍼가 포지티브 전압레벨인 상기 제1전압(VDD) 내지 상기 중간전압(VCOM)에서 구동되고, 상기 제2버퍼가 네거티브 전압레벨인 상기 중간전압(VCOM) 내지 상기 제2전압(VSS)에서 구동되는 경우 상기 제1버퍼의 방전경로 및 상기 제2버퍼의 충전 경로에 공통으로 연결되는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제1항 내지 제3항 중 어느 하나의 항에 있어서,상기 제1전압(VDD)에 일 단자가 연결된 제1저항(R1);일 단자가 상기 제1저항(R1)의 다른 일 단자에 연결되고 다른 일 단자가 상기 제2전압(VSS)에 연결된 제2저항(R2); 및상기 제1저항(R1) 및 상기 제2저항(R2)의 공통 단자가 비반전 단자에 입력되고 그 출력단자가 반전단자에 연결되어, 상기 중간전압(VCOM)을 출력하는 연산증폭기를 포함하는 중간전압 생성부를 더 구비하는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제4항에 있어서, 상기 중간전압 생성부는상기 제1저항(R1) 또는 상기 제2저항(R2)을 가변시켜 상기 중간전압(VCOM)을 조절하는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제4항에 있어서, 상기 중간전압 생성부는상기 연산증폭기의 출력단자에 커패시터를 더 구비하는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제4항에 있어서, 상기 연산증폭기는전압 이득이 1인 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제1항 내지 제3항 중 어느 하나의 항에 있어서,입력신호를 상기 제1버퍼 및 상기 제2버퍼에 전달하는 제1스위치(SW1)를 더구비하는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제8항에 있어서, 상기 제1스위치(SW1)는상기 액정디스플레이 패널의 극성을 바꾸어주는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제9항에 있어서, 상기 제1스위치(SW1)는상기 제1버퍼와 제2버퍼의 입력을 서로 교차(cross)하거나 쉬프트(shift)하여 상기 액정디스플레이 패널의 극성을 바꾸어주는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제1항 내지 제3항 중 어느 하나의 항에 있어서,상기 제1버퍼 및 상기 제2버퍼의 출력신호를 상기 액정디스플레이 패널의 데이터 라인에 연결시켜 주는 제2스위치(SW2)를 더 구비하는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제11항에 있어서, 상기 제2스위치(SW2)는상기 액정디스플레이 패널의 극성을 바꾸어주는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제12항에 있어서, 상기 제2스위치(SW2)는상기 제1버퍼와 제2버퍼의 출력을 서로 교차(cross)하거나 쉬프트(shift)하여 상기 액정디스플레이 패널의 극성을 바꾸어주는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제1항 내지 제3항 중 어느 하나의 항에 있어서,상기 제1버퍼 및 상기 제2버퍼는 전압이득이 1인 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제1항 내지 제3항 중 어느 하나의 항에 있어서, 상기 제1버퍼는,상기 제1전압(VDD) 및 상기 제2전압(VSS) 사이에서 동작하고, 입력신호를 반전시키는 제1 입력단 반전기;상기 제1전압(VDD) 및 상기 중간전압(VCOM) 사이에서 동작하고, 상기 제1 입력단 반전기의 출력을 다시 반전시키는 제1 출력단 반전기; 및상기 제1전압(VDD) 및 상기 제2전압(VSS) 사이에서 동작하고 상기 제1 출력단 반전기에 바이어스 전압을 인가하는 제1 바이어스단;을 구비하는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제15항에 있어서, 상기 제2버퍼는,상기 제1전압(VDD) 및 상기 제2전압(VSS) 사이에서 동작하고, 입력신호를 반전시키는 제2 입력단 반전기;상기 중간전압(VCOM) 및 상기 제2전압(VSS) 사이에서 동작하고, 상기 제2 입력단 반전기의 출력을 다시 반전시키는 제2 출력단 반전기; 및상기 제1전압(VDD) 및 상기 제2전압(VSS) 사이에서 동작하고 상기 제2 출력단 반전기에 바이어스 전압을 인가하는 제2 바이어스단;을 구비하는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제16항에 있어서,상기 제1버퍼의 중간전압(VCOM) 단자와 상기 제2버퍼의 중간전압(VCOM) 단자는 서로 연결되어 있는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제1항 내지 제3항 중 어느 하나의 항에 있어서, 상기 제1버퍼는,상기 제1전압(VDD) 및 상기 중간전압(VCOM) 사이에서 동작하고, 입력신호를 반전시키는 제1 입력단 반전기;상기 제1전압(VDD) 및 상기 제2전압(VSS) 사이에서 동작하고, 상기 제1 입력단 반전기의 출력을 다시 반전시키는 제1 출력단 반전기; 및상기 제1전압(VDD) 및 상기 중간전압(VCOM) 사이에서 동작하고 상기 제1 출력단 반전기에 바이어스 전압을 인가하는 제1 바이어스단;을 구비하는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제18항에 있어서, 상기 제2버퍼는,상기 중간전압(VCOM) 및 상기 제2전압(VSS) 사이에서 동작하고, 입력신호를 반전시키는 제2 입력단 반전기;상기 제1전압(VDD) 및 상기 제2전압(VSS) 사이에서 동작하고, 상기 제2 입력단 반전기의 출력을 다시 반전시키는 제2 출력단 반전기; 및상기 중간전압(VCOM) 및 상기 제2전압(VSS) 사이에서 동작하고 상기 제2 출력단 반전기에 바이어스 전압을 인가하는 제2 바이어스단;을 구비하는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
- 제19항에 있어서,상기 제1버퍼의 중간전압(VCOM) 단자와 상기 제2버퍼의 중간전압(VCOM) 단자는 서로 연결되어 있는 것을 특징으로 하는 전류소모가 적은 액정디스플레이 구동회로.
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US9310644B2 (en) | 2013-03-11 | 2016-04-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Liquid crystal display, LED backlight source, and the driving method thereof |
TWI605435B (zh) * | 2016-03-29 | 2017-11-11 | 奇景光電股份有限公司 | 源極驅動器的輸出放大器及其控制方法 |
CN107610633B (zh) * | 2017-09-28 | 2020-12-04 | 惠科股份有限公司 | 一种显示面板的驱动装置及驱动方法 |
WO2021056158A1 (zh) * | 2019-09-23 | 2021-04-01 | 京东方科技集团股份有限公司 | 源极驱动电路及驱动方法、显示装置 |
KR102676524B1 (ko) | 2020-09-18 | 2024-06-20 | 삼성전자주식회사 | 디스플레이 장치 및 그 제어 방법 |
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WO2010095819A3 (ko) | 2010-12-09 |
TW201033989A (en) | 2010-09-16 |
CN102318002A (zh) | 2012-01-11 |
CN102318002B (zh) | 2013-12-11 |
KR101037561B1 (ko) | 2011-05-27 |
KR20100094087A (ko) | 2010-08-26 |
US20110298769A1 (en) | 2011-12-08 |
US9030453B2 (en) | 2015-05-12 |
TWI417863B (zh) | 2013-12-01 |
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