TWI646516B - Source driver - Google Patents

Source driver Download PDF

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Publication number
TWI646516B
TWI646516B TW107103296A TW107103296A TWI646516B TW I646516 B TWI646516 B TW I646516B TW 107103296 A TW107103296 A TW 107103296A TW 107103296 A TW107103296 A TW 107103296A TW I646516 B TWI646516 B TW I646516B
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Taiwan
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switch
voltage
resistance
control signal
original
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TW107103296A
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Chinese (zh)
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TW201933312A (en
Inventor
黃智全
呂驊洺
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瑞鼎科技股份有限公司
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Priority to TW107103296A priority Critical patent/TWI646516B/en
Priority to CN201810156962.4A priority patent/CN110097858B/en
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Publication of TWI646516B publication Critical patent/TWI646516B/en
Publication of TW201933312A publication Critical patent/TW201933312A/en

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    • 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
    • G09G3/3685Details of drivers for data electrodes
    • G09G3/3688Details of drivers for data electrodes suitable for active matrices only

Abstract

本發明揭露一種源極驅動器。源極驅動器包含第一運算放大器、升壓電路及第一交換開關單元。第一運算放大器受控於控制訊號,且控制訊號之最高電位為工作電壓。升壓電路用以將工作電壓升壓為升壓電壓並據以產生交換開關控制訊號,其中交換開關控制訊號之最高電位為升壓電壓,且升壓電壓高於工作電壓。第一交換開關單元耦接第一運算放大器。當第一交換開關單元受控於交換開關控制訊號而導通時係具有導通電阻。若第一交換開關單元受控於控制訊號而導通時具有原始導通電阻,則導通電阻小於原始導通電阻。 The invention discloses a source driver. The source driver includes a first operational amplifier, a booster circuit, and a first exchange switch unit. The first operational amplifier is controlled by a control signal, and the highest potential of the control signal is an operating voltage. The booster circuit is used to boost the operating voltage to a boosted voltage and generate a switch control signal accordingly. The highest potential of the switch control signal is a boosted voltage, and the boosted voltage is higher than the working voltage. The first exchange switch unit is coupled to a first operational amplifier. When the first switching switch unit is controlled by the switching switch control signal and is turned on, it has an on-resistance. If the first switching switch unit is controlled by the control signal and has an original on-resistance when it is turned on, the on-resistance is smaller than the original on-resistance.

Description

源極驅動器 Source driver

本發明係與顯示裝置有關,尤其是關於一種應用於顯示裝置之源極驅動器。 The present invention relates to a display device, and more particularly to a source driver applied to a display device.

一般而言,隨著液晶顯示面板的尺寸愈來愈大,對於顯示裝置的驅動IC而言,其輸出負載亦隨之愈來愈重,導致顯示裝置的驅動IC會面臨溫度過高的問題。 Generally speaking, as the size of a liquid crystal display panel becomes larger and larger, the output load of a driving IC of a display device becomes heavier, which causes the driving IC of the display device to face a problem of excessive temperature.

詳細而言,在傳統的源極驅動器中,每個通道的運算放大器之輸出端所耦接的交換開關,其控制訊號的最高電位通常會與運算放大器之控制訊號相同,均為工作電壓,造成交換開關的等效阻抗(亦即導通電阻On-resistance)無法有效降低,使得運算放大器的迴轉率(Slew rate)不佳。當運算放大器對負載充電或放電所產生的輸出電流流經較大的導通電阻時,即會產生較大的功率損耗並隨之導致驅動IC的溫度過高,亟待克服。 In detail, in the traditional source driver, the maximum potential of the control signal of the switching switch coupled to the output terminal of the operational amplifier of each channel is usually the same as the control signal of the operational amplifier. The equivalent impedance of the switching switch (ie, the on-resistance) cannot be effectively reduced, so that the slew rate of the operational amplifier is not good. When the output current generated by the operational amplifier charging or discharging the load flows through a large on-resistance, a large power loss will occur and the temperature of the driving IC will be too high, which needs to be overcome.

有鑑於此,本發明提出一種源極驅動器,以有效解決先前技術所遭遇到之上述種種問題。 In view of this, the present invention proposes a source driver to effectively solve the aforementioned problems encountered in the prior art.

根據本發明之一具體實施例為一種源極驅動器。於此實施例中,源極驅動器包含第一運算放大器、升壓電路及第一 交換開關單元。第一運算放大器受控於控制訊號,且控制訊號之最高電位為工作電壓。升壓電路用以將工作電壓升壓為升壓電壓並據以產生交換開關控制訊號,其中交換開關控制訊號之最高電位為升壓電壓,且升壓電壓高於工作電壓。第一交換開關單元耦接第一運算放大器。當第一交換開關單元受控於交換開關控制訊號而導通時係具有導通電阻。其中,若第一交換開關單元受控於控制訊號而導通時具有原始導通電阻,則導通電阻小於原始導通電阻。 A specific embodiment of the present invention is a source driver. In this embodiment, the source driver includes a first operational amplifier, a booster circuit, and a first Switching unit. The first operational amplifier is controlled by a control signal, and the highest potential of the control signal is an operating voltage. The booster circuit is used to boost the operating voltage to a boosted voltage and generate a switch control signal accordingly. The highest potential of the switch control signal is a boosted voltage, and the boosted voltage is higher than the working voltage. The first exchange switch unit is coupled to a first operational amplifier. When the first switching switch unit is controlled by the switching switch control signal and is turned on, it has an on-resistance. Wherein, if the first switching switch unit is controlled by the control signal and has an original on-resistance when it is turned on, the on-resistance is smaller than the original on-resistance.

於一實施例中,當第一運算放大器所輸出的輸出電流流經具有導通電阻的第一交換開關單元時會產生消耗功率,且消耗功率小於該輸出電流流經具有原始導通電阻的第一交換開關單元時所產生的原始消耗功率。 In an embodiment, when the output current output by the first operational amplifier flows through the first switching switch unit having the on-resistance, power consumption is generated, and the power consumption is less than the output current flowing through the first exchange with the original on-resistance. Raw power consumption when switching the unit.

於一實施例中,消耗功率所造成之溫度上升量低於原始消耗功率所造成之原始溫度上升量。 In one embodiment, the amount of temperature increase caused by power consumption is lower than the amount of original temperature rise caused by original power consumption.

於一實施例中,源極驅動器進一步包含第二運算放大器及第二交換開關單元。第二運算放大器受控於工作電壓。第二交換開關單元耦接第二運算放大器,當第二交換開關單元受控於交換開關控制訊號而導通時係具有導通電阻,且導通電阻小於原始導通電阻。 In one embodiment, the source driver further includes a second operational amplifier and a second exchange switch unit. The second operational amplifier is controlled by the operating voltage. The second exchange switch unit is coupled to the second operational amplifier. When the second exchange switch unit is controlled by the exchange switch control signal and is turned on, it has an on resistance, and the on resistance is smaller than the original on resistance.

於一實施例中,當第二運算放大器所輸出的輸出電流流經具有導通電阻的第二交換開關單元時會產生消耗功率,該消耗功率小於輸出電流流經具有原始導通電阻的第二交換開關單 元時所產生的原始消耗功率。 In an embodiment, when the output current output by the second operational amplifier flows through the second switching switch unit having the on-resistance, power consumption is generated, and the consumed power is less than the output current flowing through the second switching switch with the original on-resistance. single The original power consumption generated by the yuan.

於一實施例中,消耗功率所造成之溫度上升量低於原始消耗功率所造成之原始溫度上升量。 In one embodiment, the amount of temperature increase caused by power consumption is lower than the amount of original temperature rise caused by original power consumption.

於一實施例中,源極驅動器進一步包含時序控制電路(Sequence control circuit),耦接於升壓電路與第一交換開關單元之間且受控於升壓電壓。 In one embodiment, the source driver further includes a sequence control circuit, which is coupled between the boost circuit and the first switching switch unit and is controlled by the boost voltage.

於一實施例中,升壓電路係為電荷泵(Charge pump)電路。 In one embodiment, the boost circuit is a charge pump circuit.

於一實施例中,電荷泵電路包含第一開關、第二開關、第三開關、第四開關及電容。第一開關與第二開關串接於工作電壓與接地電壓之間且第三開關與第四開關串接於工作電壓與升壓電壓減去工作電壓之電壓差之間,電容之一端耦接至第一開關與第二開關之間且電容之另一端耦接至第三開關與第四開關之間,第一開關與第四開關受控於第一時脈訊號且第二開關與第三開關受控於第二時脈訊號,第一時脈訊號與第二時脈訊號彼此反相。 In one embodiment, the charge pump circuit includes a first switch, a second switch, a third switch, a fourth switch, and a capacitor. The first switch and the second switch are connected in series between the operating voltage and the ground voltage, and the third switch and the fourth switch are connected in series between the operating voltage and the voltage difference between the boosted voltage minus the operating voltage. One end of the capacitor is coupled to Between the first switch and the second switch and the other end of the capacitor is coupled between the third switch and the fourth switch, the first switch and the fourth switch are controlled by the first clock signal and the second switch and the third switch Controlled by the second clock signal, the first clock signal and the second clock signal are opposite to each other.

於一實施例中,升壓電路為自舉式電路(Bootstrap circuit)。 In one embodiment, the boost circuit is a bootstrap circuit.

於一實施例中,自舉式電路包含第一開關、第二開關、第一電阻、第二電阻、二極體及電容。第一開關與第一電阻串接於工作電壓與接地電壓之間且第二電阻與第二開關串接於升壓電壓減去工作電壓之電壓差與接地電壓之間,電容之一端耦接 至第一開關與第一電阻之間且電容之另一端耦接至升壓電壓減去工作電壓之電壓差,二極體耦接於工作電壓與升壓電壓之間,第一開關亦耦接至第二電阻與第二開關之間,第二開關受控於時脈訊號。 In one embodiment, the bootstrap circuit includes a first switch, a second switch, a first resistor, a second resistor, a diode, and a capacitor. The first switch and the first resistor are connected in series between the operating voltage and the ground voltage, and the second resistor and the second switch are connected in series between the voltage difference between the boosted voltage minus the operating voltage and the ground voltage. One end of the capacitor is coupled. Between the first switch and the first resistor and the other end of the capacitor is coupled to the voltage difference minus the operating voltage, the diode is coupled between the operating voltage and the boost voltage, and the first switch is also coupled Between the second resistor and the second switch, the second switch is controlled by a clock signal.

相較於先前技術,根據本發明之源極驅動器係利用升壓電路將源極驅動器中之交換開關控制訊號的最高電位由原本的工作電壓提高至一升壓電壓,致使交換開關的導通電阻隨之變小,除了能夠減少交換開關在輸出電流流經時的消耗功率,以有效降低源極驅動器的溫度之外,還可提高各通道之運算放大器的迴轉率,故可有效克服先前技術所遭遇到之問題。 Compared with the prior art, the source driver according to the present invention uses a booster circuit to increase the highest potential of the switch control signal in the source driver from the original operating voltage to a boosted voltage, so that the on-resistance of the switch is changed with It becomes smaller, in addition to reducing the power consumption of the switch when the output current flows to effectively reduce the temperature of the source driver, it can also increase the slew rate of the operational amplifier of each channel, so it can effectively overcome the problems encountered in the previous technology. To the problem.

關於本發明之優點與精神可以藉由以下的發明詳述及所附圖式得到進一步的瞭解。 The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings.

SD‧‧‧源極驅動器 SD‧‧‧Source Driver

PDAC‧‧‧第一數位類比轉換器 PDAC‧‧‧The first digital analog converter

NDAC‧‧‧第二數位類比轉換器 NDAC‧‧‧Second Digital Analog Converter

MUX‧‧‧多工器 MUX‧‧‧Multiplexer

OP1‧‧‧第一運算放大器 OP1‧‧‧The first operational amplifier

OP2‧‧‧第二運算放大器 OP2‧‧‧Second Operational Amplifier

SU1‧‧‧第一交換開關單元 SU1‧‧‧The first exchange switch unit

SU2‧‧‧第二交換開關單元 SU2‧‧‧Second Switch Unit

BVC‧‧‧升壓電路 BVC‧‧‧Boost Circuit

SC‧‧‧時序控制電路 SC‧‧‧Sequence Control Circuit

OUT1‧‧‧第一輸出端 OUT1‧‧‧first output

OUT2‧‧‧第二輸出端 OUT2‧‧‧Second output terminal

+‧‧‧正輸入端 + ‧‧‧ Positive input

-‧‧‧負輸入端 -‧‧‧ Negative input

AVDD‧‧‧工作電壓 AVDD‧‧‧Working voltage

STB‧‧‧交換開關控制訊號 STB‧‧‧switch control signal

VBST‧‧‧升壓電壓 VBST‧‧‧Boost voltage

IOUT‧‧‧輸出電流 IOUT‧‧‧Output current

SW1~SW4‧‧‧第一開關~第四開關 SW1 ~ SW4‧‧‧First switch ~ Fourth switch

C1‧‧‧電容 C1‧‧‧capacitor

GND‧‧‧接地電壓 GND‧‧‧ ground voltage

VBST-AVDD‧‧‧升壓電壓減去工作電壓之電壓差 VBST-AVDD‧‧‧ Voltage difference minus working voltage

CLK1~CLK2‧‧‧第一時脈訊號~第二時脈訊號 CLK1 ~ CLK2‧‧‧First clock signal ~ Second clock signal

CLK‧‧‧時脈訊號 CLK‧‧‧clock signal

M1~M2‧‧‧第一電晶體開關~第二電晶體開關 M1 ~ M2‧‧‧First transistor switch ~ Second transistor switch

R1~R2‧‧‧第一電阻~第二電阻 R1 ~ R2‧‧‧First resistance ~ Second resistance

D‧‧‧二極體 D‧‧‧ Diode

RON‧‧‧導通電阻 RON‧‧‧on resistance

VG1~VG3‧‧‧最高電位 VG1 ~ VG3‧‧‧Highest potential

VDS1‧‧‧汲極-源極電壓 VDS1‧‧‧ Drain-Source Voltage

RON1~RON3‧‧‧導通電阻 RON1 ~ RON3‧‧‧on resistance

STB1~STB3‧‧‧交換開關控制訊號 STB1 ~ STB3‧‧‧switch control signal

ON‧‧‧開啟狀態 ON‧‧‧ open state

OFF‧‧‧關閉狀態 OFF‧‧‧ closed

STB0‧‧‧原始交換開關控制訊號 STB0‧‧‧ original switch control signal

SOUT‧‧‧輸出訊號 SOUT‧‧‧ output signal

SOUT0‧‧‧原始輸出訊號 SOUT0‧‧‧Original output signal

T0~T8‧‧‧時間 T0 ~ T8‧‧‧‧time

RON0‧‧‧原始導通電阻 RON0‧‧‧Original On Resistance

圖1繪示本發明之一較佳具體實施例中之源極驅動器的示意圖。 FIG. 1 is a schematic diagram of a source driver in a preferred embodiment of the present invention.

圖2繪示升壓電路為電荷泵電路之一實施例。 FIG. 2 illustrates an embodiment of a booster circuit as a charge pump circuit.

圖3繪示升壓電路為自舉式電路之一實施例。 FIG. 3 illustrates an embodiment of a booster circuit as a bootstrap circuit.

圖4繪示具有不同最高電位的交換開關控制訊號造成交換開關具有不同的導通電阻之曲線圖。 FIG. 4 is a graph showing that the switch has different on-resistances due to the control signals of the switch having different highest potentials.

圖5A繪示增壓處理前後的交換開關控制訊號的比較圖;圖5B繪示輸出訊號之波形受增壓處理前後的交換開關控制訊號之影響的比較圖。 FIG. 5A is a comparison diagram of the switch control signal before and after the boosting process; FIG. 5B is a comparison diagram of the waveform of the output signal affected by the switch switch control signal before and after the boosting process.

圖6繪示交換開關控制訊號增壓前後對交換開關的導通電阻之影響的比較圖。 FIG. 6 is a comparison diagram showing the effect on the on-resistance of the switch before and after the control signal of the switch is pressurized.

根據本發明之一具體實施例為一種源極驅動器。於此實施例中,源極驅動器係設置於顯示裝置中,用以對液晶顯示面板進行驅動。 A specific embodiment of the present invention is a source driver. In this embodiment, the source driver is disposed in the display device and is used to drive the liquid crystal display panel.

請參照圖1,圖1繪示此實施例中之源極驅動器的示意圖。如圖1所示,源極驅動器SD包含第一數位類比轉換器PDAC、第二數位類比轉換器NDAC、多工器MUX、第一運算放大器OP1、第二運算放大器OP2、第一交換開關單元SU1、第二交換開關單元SU2、升壓電路BVC、時序控制電路SC、第一輸出端OUT1及第二輸出端OUT2。 Please refer to FIG. 1, which is a schematic diagram of a source driver in this embodiment. As shown in FIG. 1, the source driver SD includes a first digital analog converter PDAC, a second digital analog converter NDAC, a multiplexer MUX, a first operational amplifier OP1, a second operational amplifier OP2, and a first switching switch unit SU1. , A second exchange switch unit SU2, a booster circuit BVC, a timing control circuit SC, a first output terminal OUT1 and a second output terminal OUT2.

第一數位類比轉換器PDAC及第二數位類比轉換器NDAC的輸出端分別耦接至多工器MUX之兩輸入端;多工器MUX之兩輸出端分別耦接至第一運算放大器OP1及第二運算放大器OP2之正輸入端+;第一運算放大器OP1及第二運算放大器OP2之負輸入端-分別耦接至其本身的輸出端;第一運算放大器OP1及第二運算放大器OP2之輸出端分別耦接至第一交換開關單元SU1及第二交換開關單元SU2;升壓電路BVC耦接至時序控制電路SC;時序控制電路SC分別耦接至第一交換開關單元SU1及第二交換開關單元SU2;第一輸出端OUT1分別耦接第一交換開關單元SU1及第二交換開關單元SU2;第二輸出端OUT2分別耦接第一交換開關單元SU1 及第二交換開關單元SU2。 The outputs of the first digital analog converter PDAC and the second digital analog converter NDAC are respectively coupled to the two inputs of the multiplexer MUX; the two outputs of the multiplexer MUX are respectively coupled to the first operational amplifier OP1 and the second The positive input terminal of the operational amplifier OP2 +; the negative input terminals of the first operational amplifier OP1 and the second operational amplifier OP2 are respectively coupled to their own output terminals; the output terminals of the first operational amplifier OP1 and the second operational amplifier OP2 are respectively Is coupled to the first exchange switch unit SU1 and the second exchange switch unit SU2; the booster circuit BVC is coupled to the sequence control circuit SC; the sequence control circuit SC is respectively coupled to the first exchange switch unit SU1 and the second exchange switch unit SU2 ; The first output terminal OUT1 is respectively coupled to the first exchange switch unit SU1 and the second exchange switch unit SU2; the second output terminal OUT2 is respectively coupled to the first exchange switch unit SU1 And the second exchange switch unit SU2.

第一運算放大器OP1及第二運算放大器OP2均受控於工作電壓AVDD。第一運算放大器OP1及第二運算放大器OP2之輸出端分別輸出一輸出電流IOUT至第一交換開關單元SU1及第二交換開關單元SU2。 The first operational amplifier OP1 and the second operational amplifier OP2 are both controlled by the operating voltage AVDD. The output terminals of the first operational amplifier OP1 and the second operational amplifier OP2 respectively output an output current IOUT to the first exchange switch unit SU1 and the second exchange switch unit SU2.

當升壓電路BVC接收到工作電壓AVDD時,升壓電路BVC會對工作電壓AVDD進行升壓處理後形成升壓電壓VBST,再根據升壓電壓VBST產生交換開關控制訊號STB至第一交換開關單元SU1及第二交換開關單元SU2。 When the booster circuit BVC receives the operating voltage AVDD, the booster circuit BVC boosts the operating voltage AVDD to form a boosted voltage VBST, and then generates a switching switch control signal STB to the first switching switch unit according to the boosted voltage VBST. SU1 and the second exchange switch unit SU2.

需說明的是,交換開關控制訊號STB的最高電位為升壓電壓VBST,且升壓電壓VBST會高於工作電壓AVDD。實際上,升壓電壓VBST可以與工作電壓AVDD具有一比例關係並可依實際需求而調整之,例如升壓電壓VBST為1.5倍的工作電壓AVDD或2倍的工作電壓AVDD,但不以此為限。 It should be noted that the highest potential of the switch control signal STB is the boosted voltage VBST, and the boosted voltage VBST will be higher than the operating voltage AVDD. In fact, the boosted voltage VBST can have a proportional relationship with the operating voltage AVDD and can be adjusted according to actual needs. For example, the boosted voltage VBST is 1.5 times the operating voltage AVDD or 2 times the operating voltage AVDD, but this is not the case. limit.

此外,在升壓電路BVC與第一交換開關單元SU1及第二交換開關單元SU2之間還可耦接有時序控制電路SC。時序控制電路SC受控於升壓電壓VBST,用以控制將交換開關控制訊號STB傳送至第一交換開關單元SU1及第二交換開關單元SU2之時序。 In addition, a timing control circuit SC may be coupled between the booster circuit BVC and the first exchange switch unit SU1 and the second exchange switch unit SU2. The timing control circuit SC is controlled by the boosted voltage VBST, and is used to control the timing of transmitting the exchange switch control signal STB to the first exchange switch unit SU1 and the second exchange switch unit SU2.

於此實施例中,第一交換開關單元SU1包含第一交換開關M1及第二交換開關M2。其中,第一交換開關M1係耦接於第一運算放大器OP1的輸出端與第一輸出端OUT1之間,且其閘極受控於交換開關控制訊號STB;第二交換開關M2係耦接於第一運算放 大器OP1的輸出端與第二輸出端OUT2之間,且其閘極受控於交換開關控制訊號STB。 In this embodiment, the first exchange switch unit SU1 includes a first exchange switch M1 and a second exchange switch M2. The first switching switch M1 is coupled between the output terminal of the first operational amplifier OP1 and the first output terminal OUT1, and its gate is controlled by the switching control signal STB. The second switching switch M2 is coupled between First operational amplifier Between the output terminal of the amplifier OP1 and the second output terminal OUT2, its gate is controlled by the switch control signal STB.

需說明的是,假設本發明之第一交換開關單元SU1中之第一交換開關M1及第二交換開關M2受控於最高電位為升壓電壓VBST的交換開關控制訊號STB而導通時具有導通電阻RON,而先前技術中之第一交換開關單元SU1中之第一交換開關M1及第二交換開關M2受控於最高電位為工作電壓AVDD的控制訊號而導通時具有原始導通電阻RON0,由於升壓電壓VBST高於工作電壓AVDD,致使本發明之交換開關導通時之導通電阻RON會小於先前技術中之交換開關導通時之原始導通電阻RON0。 It should be noted that it is assumed that the first exchange switch M1 and the second exchange switch M2 in the first exchange switch unit SU1 of the present invention are controlled by the exchange switch control signal STB whose maximum potential is the boosted voltage VBST and have an on resistance when conducting. RON, and the first exchange switch M1 and the second exchange switch M2 in the first exchange switch unit SU1 in the prior art are controlled by the control signal with the highest potential being the operating voltage AVDD and have the original on-resistance RON0 when being turned on. The voltage VBST is higher than the working voltage AVDD, so that the on-resistance RON when the switching switch of the present invention is on is smaller than the original on-resistance RON0 when the switching switch in the prior art is on.

假設本發明之第一運算放大器OP1之輸出端所輸出的輸出電流IOUT流經具有導通電阻RON的第一交換開關單元SU1時會產生消耗功率P,而先前技術中之輸出電流IOUT流經具有原始導通電阻RON0的第一交換開關單元SU1時會產生原始消耗功率P0。本發明之交換開關的消耗功率P會等於輸出電流IOUT的平方乘以導通電阻RON,而先前技術中之交換開關的原始消耗功率P0會等於輸出電流IOUT的平方乘以原始導通電阻RON0。由於導通電阻RON小於原始導通電阻RON0,導致本發明之交換開關的消耗功率P會小於先前技術中之交換開關的原始消耗功率P0,進而使得本發明之交換開關的消耗功率P所造成之溫度上升量T會低於先前技術中之交換開關的原始消耗功率P0所造成之原始溫度上升量T0。 It is assumed that when the output current IOUT output from the output terminal of the first operational amplifier OP1 of the present invention flows through the first switching switch unit SU1 having the on-resistance RON, power consumption P is generated, and the output current IOUT in the prior art flows through the original When the first switching unit SU1 of the on-resistance RON0 is switched, the original power consumption P0 is generated. The power consumption P of the switching switch of the present invention is equal to the square of the output current IOUT times the on-resistance RON. The original power consumption P0 of the switching switch in the prior art is equal to the square of the output current IOUT times the original on-resistance RON0. Because the on-resistance RON is smaller than the original on-resistance RON0, the power consumption P of the switching switch of the present invention will be smaller than the original power consumption P0 of the switching switch in the prior art, thereby increasing the temperature caused by the power consumption P of the switching switch of the present invention The amount T will be lower than the original temperature rise T0 caused by the original power consumption P0 of the switch in the prior art.

同理,第二交換開關單元SU2包含第三交換開關M3 及第四交換開關M4。其中,第三交換開關M3係耦接於第二運算放大器OP2的輸出端與第一輸出端OUT1之間,且其閘極受控於交換開關控制訊號STB;第四交換開關M4係耦接於第二運算放大器OP2的輸出端與第二輸出端OUT2之間,且其閘極受控於交換開關控制訊號STB。 Similarly, the second exchange switch unit SU2 includes a third exchange switch M3. And the fourth exchange switch M4. The third switching switch M3 is coupled between the output terminal of the second operational amplifier OP2 and the first output terminal OUT1, and its gate is controlled by the switching switch control signal STB. The fourth switching switch M4 is coupled between Between the output terminal of the second operational amplifier OP2 and the second output terminal OUT2, its gate is controlled by the switch control signal STB.

假設本發明之第二交換開關單元SU2中之第三交換開關M3及第四交換開關M4受控於最高電位為升壓電壓VBST的交換開關控制訊號STB而導通時具有導通電阻RON,而先前技術中之第二交換開關單元SU2中之第三交換開關M3及第四交換開關M4受控於最高電位為工作電壓AVDD的控制訊號而導通時具有原始導通電阻RON0,由於升壓電壓VBST高於工作電壓AVDD,致使本發明之交換開關導通時之導通電阻RON會小於先前技術中之交換開關導通時之原始導通電阻RON0。 It is assumed that the third exchange switch M3 and the fourth exchange switch M4 in the second exchange switch unit SU2 of the present invention are controlled by the exchange switch control signal STB whose maximum potential is the boosted voltage VBST, and have an on-resistance RON when conducting, and the prior art The third exchange switch M3 and the fourth exchange switch M4 in the second exchange switch unit SU2 are controlled by the control signal with the highest potential being the operating voltage AVDD and have the original on-resistance RON0 when they are turned on. Because the boosted voltage VBST is higher than the operation The voltage AVDD causes the on-resistance RON when the switching switch of the present invention is on, to be smaller than the original on-resistance RON0 when the switching switch in the prior art is on.

假設本發明之第二運算放大器OP2之輸出端所輸出的輸出電流IOUT流經具有導通電阻RON的第二交換開關單元SU2中之第三交換開關M3及第四交換開關M4時會產生消耗功率P,而先前技術中之輸出電流IOUT流經具有原始導通電阻RON0的交換開關時會產生原始消耗功率P0,由於導通電阻RON小於原始導通電阻RON0,致使本發明之交換開關的消耗功率P會小於先前技術中之交換開關的原始消耗功率P0,並且本發明之交換開關的消耗功率P所造成之溫度上升量T會低於先前技術中之交換開關的原始消耗功率P0所造成之原始溫度上升量T0。 It is assumed that when the output current IOUT output from the output terminal of the second operational amplifier OP2 of the present invention flows through the third exchange switch M3 and the fourth exchange switch M4 in the second exchange switch unit SU2 having the on-resistance RON, power consumption P is generated. However, when the output current IOUT in the prior art flows through the switch with the original on-resistance RON0, the original power consumption P0 will be generated. Since the on-resistance RON is smaller than the original on-resistance RON0, the power consumption P of the switch of the present invention will be less The original power consumption P0 of the switching switch in the technology, and the temperature increase amount T caused by the power consumption P of the switching switch of the present invention will be lower than the original temperature increase amount T0 caused by the original power consumption P0 of the switching switch in the prior art. .

於實際應用中,升壓電路BVC可以是電荷泵(Charge pump)電路或自舉式電路(Bootstrap circuit),但不以此為限。 In practical applications, the boost circuit BVC may be a charge pump circuit or a bootstrap circuit, but is not limited thereto.

請參照圖2,圖2繪示升壓電路BVC為電荷泵電路之一實施例。 Please refer to FIG. 2, which illustrates a booster circuit BVC as an embodiment of a charge pump circuit.

如圖2所示,升壓電路(電荷泵電路)BVC可包含第一開關SW1、第二開關SW2、第三開關SW3、第四開關SW4及電容C1。第一開關SW1與第二開關SW2串接於工作電壓AVDD與接地電壓GND之間且第三開關SW3與第四開關SW4串接於工作電壓AVDD與(升壓電壓VBST減去工作電壓AVDD之電壓差)之間。電容C1之一端耦接至第一開關SW1與第二開關SW2之間且電容C1之另一端耦接至第三開關SW3與第四開關SW4之間。 As shown in FIG. 2, the boost circuit (charge pump circuit) BVC may include a first switch SW1, a second switch SW2, a third switch SW3, a fourth switch SW4, and a capacitor C1. The first switch SW1 and the second switch SW2 are connected in series between the operating voltage AVDD and the ground voltage GND, and the third switch SW3 and the fourth switch SW4 are connected in series between the operating voltage AVDD and (the voltage of the boost voltage VBST minus the operating voltage AVDD Poor). One terminal of the capacitor C1 is coupled between the first switch SW1 and the second switch SW2, and the other terminal of the capacitor C1 is coupled between the third switch SW3 and the fourth switch SW4.

需說明的是,第一開關SW1與第四開關SW4受控於第一時脈訊號CLK1且第二開關SW2與第三開關SW3受控於第二時脈訊號CLK2。其中,第一時脈訊號CLK1與第二時脈訊號CLK2彼此反相。也就是說,當第一開關SW1與第四開關SW4受控於第一時脈訊號CLK1而開啟時,第二開關SW2與第三開關SW3會受控於第二時脈訊號CLK2而關閉;當第一開關SW1與第四開關SW4受控於第一時脈訊號CLK1而關閉時,第二開關SW2與第三開關SW3會受控於第二時脈訊號CLK2而開啟。 It should be noted that the first switch SW1 and the fourth switch SW4 are controlled by the first clock signal CLK1 and the second switch SW2 and the third switch SW3 are controlled by the second clock signal CLK2. The first clock signal CLK1 and the second clock signal CLK2 are opposite to each other. That is, when the first switch SW1 and the fourth switch SW4 are controlled by the first clock signal CLK1 and turned on, the second switch SW2 and the third switch SW3 are controlled by the second clock signal CLK2 and turned off; When the first switch SW1 and the fourth switch SW4 are controlled by the first clock signal CLK1 and turned off, the second switch SW2 and the third switch SW3 are turned on by the second clock signal CLK2.

請參照圖3,圖3繪示升壓電路BVC為自舉式電路之一實施例。 Please refer to FIG. 3. FIG. 3 illustrates an embodiment of the booster circuit BVC as a bootstrap circuit.

如圖3所示,升壓電路(自舉式電路)BVC可包含第一 電晶體開關M1、第二電晶體開關M2、第一電阻R1、第二電阻R2、二極體D及電容C1。第一開關M1與第一電阻R1串接於工作電壓AVDD與接地電壓GND之間且第二電阻R2與第二開關M2串接於升壓電壓VBST與接地電壓GND之間,電容C1之一端耦接至第一開關M1與第一電阻R1之間且電容C1之另一端耦接至升壓電壓VBST,第一開關M1亦耦接至第二電阻R2與第二開關M2之間,第二開關M2受控於時脈訊號CLK。 As shown in FIG. 3, the boost circuit (bootstrap circuit) BVC may include a first The transistor switch M1, the second transistor switch M2, the first resistor R1, the second resistor R2, the diode D, and the capacitor C1. The first switch M1 and the first resistor R1 are connected in series between the operating voltage AVDD and the ground voltage GND, and the second resistor R2 and the second switch M2 are connected in series between the boosted voltage VBST and the ground voltage GND. One terminal of the capacitor C1 is coupled. Connected between the first switch M1 and the first resistor R1 and the other end of the capacitor C1 is coupled to the boosted voltage VBST. The first switch M1 is also coupled between the second resistor R2 and the second switch M2. The second switch M2 is controlled by the clock signal CLK.

請參照圖4,圖4繪示具有不同最高電位VG1~VG3的交換開關控制訊號STB1~STB3造成交換開關具有不同的導通電阻RON1~RON3之曲線圖。由圖4可知:對相同的交換開關的汲極-源極電壓VDS1而言,當交換開關控制訊號的最高電位由原本較低的VG1升壓至較高的VG3時,交換開關受控於交換開關控制訊號的交換開關所具有的導通電阻會相對應地由原本較高的RON1降低至較低的RON3。 Please refer to FIG. 4. FIG. 4 is a graph showing exchange switch control signals STB1 to STB3 having different highest potentials VG1 to VG3 causing exchange switches to have different on-resistances RON1 to RON3. It can be known from FIG. 4 that, for the drain-source voltage VDS1 of the same exchange switch, when the highest potential of the exchange switch control signal is boosted from the original lower VG1 to a higher VG3, the exchange switch is controlled by the exchange. The on-resistance of the switch of the switch control signal will be correspondingly reduced from the originally higher RON1 to a lower RON3.

請參照圖5A及圖5B,圖5A繪示增壓處理前後的交換開關控制訊號的比較圖;圖5B繪示輸出訊號之波形受增壓處理前後的交換開關控制訊號之影響的比較圖。 Please refer to FIG. 5A and FIG. 5B. FIG. 5A shows a comparison diagram of the switch control signal before and after the boosting process; and FIG. 5B shows a comparison diagram of the waveform of the output signal affected by the switch switch control signal before and after the boosting process.

如圖5A及圖5B所示,未經增壓處理的交換開關控制訊號STB0之最高電位為工作電壓AVDD,而經增壓處理後的交換開關控制訊號STB之最高電位為升壓電壓VBST,且升壓電壓VBST明顯高於工作電壓AVDD。 As shown in FIG. 5A and FIG. 5B, the highest potential of the unswitched switch control signal STB0 is the working voltage AVDD, and the highest potential of the switched switch control signal STB after the boost processing is the boosted voltage VBST, and The boosted voltage VBST is significantly higher than the operating voltage AVDD.

於時間T0,由圖5A可知:未經增壓處理的交換開關 控制訊號STB0會由最低電位VMIN上升至工作電壓AVDD,而經增壓處理後的交換開關控制訊號STB則會由最低電位VMIN上升至升壓電壓VBST,亦即兩者均從關閉(OFF)狀態切換成開啟(ON)狀態。由圖5B可知:受增壓處理後的交換開關控制訊號STB影響的輸出訊號SOUT之波形會上升得較快而於時間T1達到理想值,而受未經增壓處理的交換開關控制訊號STB0影響的輸出訊號SOUT0之波形則上升得較慢而於時間T2才達到理想值。 At time T0, it can be known from FIG. 5A that the switching switch has not been subjected to the boosting treatment. The control signal STB0 will rise from the lowest potential VMIN to the operating voltage AVDD, and the booster-treated switch control signal STB will rise from the lowest potential VMIN to the boosted voltage VBST, that is, both of them are turned off. Switch to the ON state. It can be seen from FIG. 5B that the waveform of the output signal SOUT affected by the booster-treated switch control signal STB rises faster and reaches an ideal value at time T1, and is affected by the unpressurized switch-controller signal STB0. The waveform of the output signal SOUT0 rises slowly and reaches the ideal value at time T2.

於時間T0至T3的期間,未經增壓處理的交換開關控制訊號STB0與經增壓處理後的交換開關控制訊號STB均維持於開啟(ON)狀態。 During the period from T0 to T3, the switch switch control signal STB0 and the switch switch control signal STB after the pressurization process are maintained in the ON state.

於時間T3,由圖5A可知:未經增壓處理的交換開關控制訊號STB0會由工作電壓AVDD下降至最低電位VMIN並維持至時間T4,而經增壓處理後的交換開關控制訊號STB則會由升壓電壓VBST下降至最低電位VMIN並維持至時間T4,亦即兩者於時間T3均從開啟(ON)狀態切換成關閉(OFF)狀態並維持關閉(OFF)狀態至時間T4。由圖5B可知:於時間T3至T4的期間,受未經增壓處理的交換開關控制訊號STB0影響的原始輸出訊號SOUT0與受增壓處理後的交換開關控制訊號STB影響的輸出訊號SOUT的波形均維持於其理想值不變。 At time T3, it can be known from FIG. 5A that the unswitched switching switch control signal STB0 will drop from the working voltage AVDD to the lowest potential VMIN and maintain it for time T4, and the boosted switching switch control signal STB will be The boosted voltage VBST drops to the minimum potential VMIN and is maintained for time T4, that is, both of them are switched from the ON state to the OFF state at time T3 and maintained in the OFF state for time T4. It can be known from FIG. 5B that during the period T3 to T4, the waveforms of the original output signal SOUT0 affected by the unpressurized switch control signal STB0 and the output signal SOUT affected by the pressurized switch control signal STB. All remained at their ideal values.

於時間T4,由圖5A可知:未經增壓處理的交換開關控制訊號STB0會由最低電位VMIN上升至工作電壓AVDD,而經增壓處理後的交換開關控制訊號STB則會由最低電位VMIN上升至升 壓電壓VBST,亦即兩者均從關閉(OFF)狀態切換成開啟(ON)狀態。由圖5B可知:受增壓處理後的交換開關控制訊號STB影響的輸出訊號SOUT之波形會下降得較快而於時間T5達到理想值,而受未經增壓處理的交換開關控制訊號STB0影響的原始輸出訊號SOUT0之波形則下降得較慢而於時間T6才達到理想值。 At time T4, it can be known from FIG. 5A that the switch control signal STB0 that is not boosted will rise from the lowest potential VMIN to the operating voltage AVDD, and the switch control signal STB that is boosted will rise from the lowest potential VMIN To rise The voltage VBST, that is, both are switched from the OFF state to the ON state. It can be known from FIG. 5B that the waveform of the output signal SOUT that is affected by the switching switch control signal STB after the boosting process will fall faster and reach the ideal value at time T5, but is affected by the unswitched switching switch control signal STB0. The waveform of the original output signal SOUT0 drops slowly and reaches the ideal value at time T6.

於時間T4至T7的期間,未經增壓處理的交換開關控制訊號STB0與經增壓處理後的交換開關控制訊號STB均維持於開啟(ON)狀態。 During the period from time T4 to T7, the switch switch control signal STB0 without being supercharged and the switch switch control signal STB after being supercharged are maintained in the ON state.

於時間T7,由圖5A可知:未經增壓處理的交換開關控制訊號STB0會由工作電壓AVDD下降至最低電位VMIN並維持至時間T4,而經增壓處理後的交換開關控制訊號STB則會由升壓電壓VBST下降至最低電位VMIN並維持至時間T4,亦即兩者於時間T7均從開啟(ON)狀態切換成關閉(OFF)狀態並維持關閉(OFF)狀態至時間T8。由圖5B可知:於時間T7至T8的期間,受未經增壓處理的交換開關控制訊號STB0影響的原始輸出訊號SOUT0與受經增壓處理後的交換開關控制訊號STB影響的輸出訊號SOUT的波形均維持於理想值不變。至於其餘可依前述類推,於此不另行贅述。 At time T7, it can be known from FIG. 5A that the unswitched switching switch control signal STB0 will drop from the operating voltage AVDD to the minimum potential VMIN and remain at time T4, and the boosted switching switch control signal STB will be The boosted voltage VBST drops to the minimum potential VMIN and is maintained for time T4, that is, both of them are switched from the ON state to the OFF state at time T7 and maintained in the OFF state to time T8. It can be known from FIG. 5B that during the period T7 to T8, the original output signal SOUT0 affected by the unpressurized switch control signal STB0 and the output signal SOUT affected by the pressurized switch control signal STB. The waveforms are maintained at ideal values. The rest can be deduced by analogy, and will not be repeated here.

請參照圖6,圖6繪示交換開關控制訊號增壓前後對交換開關的導通電阻之影響的比較圖。如圖6所示,假設交換開關受控於經增壓處理後的交換開關控制訊號STB而導通時會具有導通電阻RON,而交換開關受控於未經增壓處理的交換開關控制訊號STB0而導通時會具有原始導通電阻RON0,由於經增壓處理後的 交換開關控制訊號STB之最高電位(升壓電壓VBST)高於未經增壓處理的交換開關控制訊號STB0之最高電位(工作電壓AVDD),所以比較圖6中之導通電阻RON曲線與原始導通電阻RON0曲線即可清楚得知:受控於經增壓處理後的交換開關控制訊號STB之交換開關導通時的導通電阻RON會小於受控於未經增壓處理的交換開關控制訊號STB0之交換開關導通時的原始導通電阻RON0,故能達到降低交換開關導通時的導通電阻之功效。 Please refer to FIG. 6. FIG. 6 shows a comparison diagram of the effect on the on-resistance of the switch before and after the control signal of the switch is boosted. As shown in FIG. 6, it is assumed that the switching switch is controlled by the switching switch control signal STB after being boosted and has an on-resistance RON when it is turned on, and the switching switch is controlled by the switching switch control signal STB0 without being boosted When turned on, it will have the original on-resistance RON0. The highest potential of the switch control signal STB (boost voltage VBST) is higher than the highest potential of the non-boosted switch control signal STB0 (working voltage AVDD), so compare the on-resistance RON curve in Figure 6 with the original on-resistance The RON0 curve clearly shows that the on-resistance RON when the exchange switch controlled by the boost switch-treated control signal STB is turned on will be smaller than the exchange switch controlled by the unpressurized switch control signal STB0. The original on-resistance RON0 at the time of conduction can achieve the effect of reducing the on-resistance when the switching switch is on.

此外,由於受控於經增壓處理後的交換開關控制訊號STB之交換開關導通時的導通電阻RON小於受控於未經增壓處理的交換開關控制訊號STB0之交換開關導通時的原始導通電阻RON0,亦使得輸出電流流經受控於經增壓處理後的交換開關控制訊號STB之交換開關時的消耗功率會小於輸出電流流經受控於未經增壓處理的交換開關控制訊號STB0之交換開關導通時的消耗功率,而有效地降低源極驅動器的溫度。舉例而言,根據實驗數據可發現到:經增壓處理後的源極驅動器的溫度比起未經增壓處理的源極驅動器的溫度可下降約攝氏3~4度之多,故可有效避免源極驅動器由於溫度過高而影響其效能。 In addition, the on-resistance RON when the exchange switch controlled by the booster-treated switch control signal STB is on is smaller than the original on-resistance when the exchange switch controlled by the non-boosted switch control signal STB0 is on. RON0, so that the power consumption when the output current flows through the switch control signal STB controlled by the supercharged process will be less than the output current through the switch control signal STB0 controlled by the unpressurized process. The switch consumes power when it is turned on, which effectively reduces the temperature of the source driver. For example, according to the experimental data, it can be found that the temperature of the source driver after the supercharging treatment can be reduced by about 3 ~ 4 degrees Celsius compared with the temperature of the source driver without the supercharging treatment, so it can be effectively avoided. The source driver affects its performance due to excessive temperature.

綜合上述實施例可知:相較於先前技術,根據本發明之源極驅動器係利用升壓電路將源極驅動器中之交換開關控制訊號的最高電位由原本的工作電壓提高至一升壓電壓,致使交換開關的導通電阻隨之變小,除了能夠減少交換開關在輸出電流流經時的消耗功率,以有效降低源極驅動器的溫度之外,還可提高 各通道之運算放大器的迴轉率,故可有效克服先前技術所遭遇到之問題。 It can be known from the above embodiments that compared with the prior art, the source driver according to the present invention uses a boost circuit to increase the highest potential of the switching switch control signal in the source driver from the original operating voltage to a boosted voltage, so that The on-resistance of the switching switch is reduced accordingly. In addition to reducing the power consumption of the switching switch when the output current flows, in order to effectively reduce the temperature of the source driver, it can also increase the temperature of the source driver. The slew rate of the operational amplifier of each channel can effectively overcome the problems encountered in the prior art.

由以上較佳具體實施例之詳述,係希望能更加清楚描述本發明之特徵與精神,而並非以上述所揭露的較佳具體實施例來對本發明之範疇加以限制。相反地,其目的是希望能涵蓋各種改變及具相等性的安排於本發明所欲申請之專利範圍的範疇內。藉由以上較佳具體實施例之詳述,係希望能更加清楚描述本發明之特徵與精神,而並非以上述所揭露的較佳具體實施例來對本發明之範疇加以限制。相反地,其目的是希望能涵蓋各種改變及具相等性的安排於本發明所欲申請之專利範圍的範疇內。 From the detailed description of the above preferred embodiments, it is hoped that the features and spirit of the present invention can be described more clearly, and the scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, the intention is to cover various changes and equivalent arrangements within the scope of the patents to be applied for in the present invention. With the above detailed description of the preferred embodiments, it is hoped that the features and spirit of the present invention can be more clearly described, and the scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, the intention is to cover various changes and equivalent arrangements within the scope of the patents to be applied for in the present invention.

Claims (11)

一種源極驅動器,包含:一第一運算放大器,受控於一控制訊號,且該控制訊號之最高電位為一工作電壓;一升壓電路,用以將該工作電壓升壓為一升壓電壓並據以產生一交換開關控制訊號,其中該交換開關控制訊號之最高電位為該升壓電壓,且該升壓電壓高於該工作電壓;以及一第一交換開關單元,耦接該第一運算放大器,當該第一交換開關單元受控於該交換開關控制訊號而導通時係具有一導通電阻;其中,若該第一交換開關單元受控於該控制訊號而導通時具有一原始導通電阻,則該導通電阻小於該原始導通電阻。A source driver includes: a first operational amplifier controlled by a control signal, and the highest potential of the control signal is a working voltage; a booster circuit for boosting the working voltage to a boosted voltage A switching switch control signal is generated accordingly, wherein the highest potential of the switching switch control signal is the boost voltage, and the boost voltage is higher than the operating voltage; and a first switch switch unit is coupled to the first operation. The amplifier has an on-resistance when the first exchange switch unit is controlled by the exchange switch control signal and is turned on; wherein, if the first exchange switch unit is controlled by the control signal and is turned on, it has an original on-resistance, Then the on-resistance is smaller than the original on-resistance. 如申請專利範圍第1項所述之源極驅動器,其中當該第一運算放大器所輸出的一輸出電流流經具有該導通電阻的該第一交換開關單元時會產生一消耗功率,且該消耗功率小於該輸出電流流經具有該原始導通電阻的該第一交換開關單元時所產生的一原始消耗功率。The source driver according to item 1 of the patent application scope, wherein when an output current output by the first operational amplifier flows through the first switching switch unit having the on-resistance, a power consumption is generated, and the consumption The power is less than an original power consumption generated when the output current flows through the first switching switch unit having the original on-resistance. 如申請專利範圍第2項所述之源極驅動器,其中該消耗功率所造成之一溫度上升量低於該原始消耗功率所造成之一原始溫度上升量。The source driver according to item 2 of the scope of patent application, wherein a temperature rise amount caused by the consumed power is lower than an original temperature rise amount caused by the original consumed power. 如申請專利範圍第1項所述之源極驅動器,進一步包含:一第二運算放大器,受控於該工作電壓;以及一第二交換開關單元,耦接該第二運算放大器,當該第二交換開關單元受控於該交換開關控制訊號而導通時係具有該導通電阻,且該導通電阻小於該原始導通電阻。The source driver according to item 1 of the scope of patent application, further comprising: a second operational amplifier controlled by the operating voltage; and a second exchange switch unit coupled to the second operational amplifier. The switching switch unit is controlled by the switching switch control signal to have the on-resistance when it is turned on, and the on-resistance is smaller than the original on-resistance. 如申請專利範圍第4項所述之源極驅動器,其中當該第二運算放大器所輸出的一輸出電流流經具有該導通電阻的該第二交換開關單元時會產生一消耗功率,且該消耗功率小於該輸出電流流經具有該原始導通電阻的該第二交換開關單元時所產生的一原始消耗功率。The source driver according to item 4 of the scope of patent application, wherein when an output current output by the second operational amplifier flows through the second switching switch unit having the on-resistance, a power consumption is generated, and the consumption The power is less than an original power consumption generated when the output current flows through the second switching switch unit having the original on-resistance. 如申請專利範圍第5項所述之源極驅動器,其中該消耗功率所造成之一溫度上升量低於該原始消耗功率所造成之一原始溫度上升量。The source driver according to item 5 of the scope of patent application, wherein a temperature rise amount caused by the consumed power is lower than an original temperature rise amount caused by the original consumed power. 如申請專利範圍第1項所述之源極驅動器,進一步包含:一時序控制電路(Sequence control circuit),耦接於該升壓電路與該第一交換開關單元之間,受控於該升壓電壓。The source driver according to item 1 of the scope of patent application, further comprising: a sequence control circuit coupled between the booster circuit and the first switching switch unit and controlled by the booster Voltage. 如申請專利範圍第1項所述之源極驅動器,其中該升壓電路係為一電荷泵(Charge pump)電路。The source driver according to item 1 of the application, wherein the booster circuit is a charge pump circuit. 如申請專利範圍第8項所述之源極驅動器,其中該電荷泵電路包含一第一開關、一第二開關、一第三開關、一第四開關及一電容,該第一開關與該第二開關串接於該工作電壓與一接地電壓之間且該第三開關與該第四開關串接於該工作電壓與該升壓電壓減去該工作電壓之電壓差之間,該電容之一端耦接至該第一開關與該第二開關之間且該電容之另一端耦接至該第三開關與該第四開關之間,該第一開關與該第四開關受控於一第一時脈訊號且該第二開關與該第三開關受控於一第二時脈訊號,該第一時脈訊號與該第二時脈訊號彼此反相。The source driver according to item 8 of the scope of patent application, wherein the charge pump circuit includes a first switch, a second switch, a third switch, a fourth switch, and a capacitor, the first switch and the first switch Two switches are connected in series between the operating voltage and a ground voltage, and the third switch and the fourth switch are connected in series between the operating voltage and the voltage difference between the boosted voltage minus the operating voltage, and one end of the capacitor Coupled between the first switch and the second switch and the other end of the capacitor is coupled between the third switch and the fourth switch, the first switch and the fourth switch are controlled by a first The clock signal and the second switch and the third switch are controlled by a second clock signal, and the first clock signal and the second clock signal are opposite to each other. 如申請專利範圍第1項所述之源極驅動器,其中該升壓電路係為一自舉式電路(Bootstrap circuit)。The source driver according to item 1 of the patent application scope, wherein the booster circuit is a bootstrap circuit. 如申請專利範圍第10項所述之源極驅動器,其中該自舉式電路包含一第一開關、一第二開關、一第一電阻、一第二電阻、一二極體及一電容,該第一開關與該第一電阻串接於該工作電壓與一接地電壓之間且該第二電阻與該第二開關串接於該升壓電壓減去該工作電壓之電壓差與該接地電壓之間,該電容之一端耦接至該第一開關與該第一電阻之間且該電容之另一端耦接至該升壓電壓減去該工作電壓之電壓差,該二極體耦接於該工作電壓與該升壓電壓之間,該第一開關亦耦接至該第二電阻與該第二開關之間,該第二開關受控於一時脈訊號。The source driver according to item 10 of the patent application scope, wherein the bootstrap circuit includes a first switch, a second switch, a first resistor, a second resistor, a diode, and a capacitor. A first switch and the first resistor are connected in series between the operating voltage and a ground voltage, and the second resistor and the second switch are connected in series between the boosted voltage minus the operating voltage and the ground voltage. One end of the capacitor is coupled between the first switch and the first resistor and the other end of the capacitor is coupled to the voltage difference of the boosted voltage minus the operating voltage, and the diode is coupled to the Between the operating voltage and the boosted voltage, the first switch is also coupled between the second resistor and the second switch, and the second switch is controlled by a clock signal.
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