CN110599934B - 显示驱动器的感测电路 - Google Patents

显示驱动器的感测电路 Download PDF

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CN110599934B
CN110599934B CN201811098893.2A CN201811098893A CN110599934B CN 110599934 B CN110599934 B CN 110599934B CN 201811098893 A CN201811098893 A CN 201811098893A CN 110599934 B CN110599934 B CN 110599934B
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曾柏瑜
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Novatek Microelectronics Corp
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Abstract

本发明提供一种显示驱动器的感测电路。该感测电路包含采样保持电路与增益放大器。采样保持电路包含第一充电路径与第二充电路径。第一充电路径在第一感测节点与第一参考节点之间,依据模拟电压信号与参考电压而选择性产生第一充电电位差。第二充电路径将参考电压选择性传导至第二感测节点。在第一感测节点与第二感测节点产生差动输入信号对。第一充电路径与第二充电路径采用耐高压元件。增益放大器通过第一输入节点与第二输入节点接收差动输入信号对,并在第一输出节点与第二输出节点产生差动输出信号对。

Description

显示驱动器的感测电路
技术领域
本发明涉及一种感测电路,且特别涉及一种可将模拟电压信号转换为低电压差动输出信号的感测电路。
背景技术
请参见图1,其是OLED像素电路的操作方式的示意图。有机发光二极管(organiclight-emitting diode,简称为OLED)显示面板包含以矩阵方式排列的多个OLED像素电路,且可以PXLmn表示位于第m行与第n列的像素电路 17。像素电路17经由第m根数据线DLm与第m根感测线SLm而电连接于源极驱动器,以及经由第n根栅极线GLn而电连接至栅极驱动器。源极驱动器与栅极驱动器均从时序控制器接收与像素电路17相对应的特定控制信号。
选择像素电路(PXLmn)17显示时,由第n根栅极线GLn传送的栅极控制信号导通晶体管17a,且经由第m根数据线DLm传送的数据信号对像素电容Cpxl进行充电。一旦像素电容Cpxl的跨压足以导通晶体管17b时,将伴随产生用于驱动OLED 17d的像素驱动电流Idrv
随着时间的经过,OLED 17d的特性,例如,临界电压Vth可能会偏移或是递降(degrade),因而需要采用可检测OLED 17d状态的感测机制。当开关 17c为导通时,像素节点Npxl的电压可以承受OLED 17的临界电压Vth。经由第m根感测线SLm,源极驱动器可检测并接收OLED 17d的临界电压Vth
由于临界电压Vth为模拟电压信号的缘故,需要使用模拟数字转换器 (analog-to-digital converter,简称为ADC)进行转换。然而,模拟电压信号的范围超过ADC的操作电压的范围。因此,需要采取降低电压的技术,将临界电压Vth降至ADC所需的低电压范围。然而,降低电压需额外的电路与面积。
假设显示面板包含M*N个像素电路,则需要大面积的源极驱动器,才能检测并降低对全部M*N个像素电路所检测的临界电压Vth。因此,需要发展出有效降低面积的作法。
发明内容
本发明为一种感测电路,此种感测电路可将代表像素电路的临界电压Vth的模拟电压信号,转换为供模拟数字转换器转换用的差动输出信号。采用耐高压元件的感测电路,可以在不需额外使用电压缩小化电路的情况下,将差动输入信号直接放大并转换为差动输出信号对。
根据本发明的一方面,提出一种感测电路。感测电路包含采样保持电路与增益放大器。采样保持电路将与像素电路对应的模拟电压信号转换为差动输入信号对。采样保持电路包含第一充电路径与第二充电路径。第一充电路径在第一感测节点与第一参考节点间,依据模拟电压信号与参考电压而选择性产生第一充电电位差。在第一感测节点产生差动输入信号对的其中一个。第二充电路径用于将参考电压选择性传导至第二感测节点。在第二感测节点产生该对差动输入信号的另一个。第一充电路径与第二充电路径采用耐高压元件。增益放大器电连接于采样保持电路。增益放大器包含第一输入节点、第二输入节点、第一输出节点与第二输出节点。增益放大器用于通过第一输入节点与第二输入节点而接收差动输入信号对,并在第一输出节点与第二输出节点产生差动输出信号对。
为了对本发明的上述及其他方面有更佳的了解,下文特举实施例,并配合附图详细说明如下:
附图说明
图1,其是OLED像素电路的操作的示意图。
图2,其是在显示装置中,与感测像素电路的临界电压Vth相关的元件的示意图。
图3,其是根据本发明实施例的感测电路的方块图。
图4,其是与图3所示的感测电路相关信号的波形图。
图5,其是实现感测电路的示意图。
图6,其是共用模式下的放大器电路的示意图。
图7,其是放大模式下的放大器电路的示意图。
图8,其是增益放大器的结构的示意图。
图9A,其是输入级电路使用NMOS晶体管的示意图。
图9B,其是输入级电路使用PMOS晶体管的示意图。
图10,其是根据本发明的实施例所实现的S/H电路的示意图。
具体实施方式
请参见图2,其是在显示装置中,与感测像素电路的临界电压Vth相关的元件的示意图。显示装置20包含显示面板27、源极驱动器23、时序控制器 21,以及栅极驱动器25。时序控制器21与显示面板27均电连接于源极驱动器23与栅极驱动器25。
显示面板27利用基本显示元件271(像素)显示图像,其中每个基本显示元件包含红色(R)像素电路271a、绿色(G)像素电路271b,以及蓝色(B)像素电路271c。
源极驱动器23可包含一个或多个感测电路231、233,且各个感测电路 231、233进一步包含ADC 231a、233a、选择模块231b、233b、增益放大器 231c、233c,以及多个采样保持(sample and hold,简称为S/H)电路2311、2313、 2315、2331、2333、2335。由于各个感测电路231、233元件与连接关系类似,此处仅以感测电路231为例。
S/H电路2311经由感测线SL1接收第一通道(ch1)模拟电压信号,其中第一通道(ch1)模拟电压信号Vth(ch1)代表在R像素电路271a内的OLED的临界电压Vth。S/H电路2313经由感测线SL2接收第二通道(ch2)模拟电压信号 Vth(ch2),其中第二通道(ch2)模拟电压信号Vth(ch2)代表在G像素电路271b内的 OLED的临界电压Vth。S/H电路2315经由感测线SL3接收第三通道(ch3)模拟电压信号Vth(ch3),其中第三通道(ch3)模拟电压信号Vth(ch3)代表在B像素电路 271内的OLED的临界电压Vth
根据本发明的实施例,源极驱动器23所包含的感测电路231的数量并不受限制。如图2所示,感测电路231、233可包含选择模块231b、233b,藉由选择模块231b、233b的采用而减少所需使用的ADC 231a、233a的数量并降低硬件成本。每个选择模块231b、233b包含一个解多工器(demultiplexer) 与数个选择电路。选择模块231b、233b从时序控制器21接收选择控制信号后,通过解多工器产生与各个选择电路相对应的通道选择信号ENsel
S/H电路2311、2313、2315从像素电路(R像素电路271a、G像素电路 271b、B像素电路271c)接收模拟电压信号Vth(ch1)、Vth(ch2)、Vth(ch3)后,S/H电路2311、2313、2315与增益放大器231c感测并缩小(降低)所接收到的模拟电压信号的电压电平。采用解多工器与选择电路时,接收到通道选择信号ENsel的选择电路会被导通,使得经感测与降压的模拟电压信号可被传导至ADC 231a、233a。然后,ADC 231a、233a将经过缩小后的模拟电压信号,转换为以数字信号表示的ADC码。接着,再将数字信号传送至时序控制器21。
由于数字信号来自代表像素电路的临界电压的模拟电压信号Vth(ch1)、 Vth(ch2)、Vth(ch3),ADC码可用于反映像素电路的状态。
在本发明的实施例中,解多工器从时序控制器21接收通道选择信号ENsel。基本上,通道选择信号ENsel分别对应于S/H电路2311、2313、2315以及S/H 电路2311、2313、2314。藉由通道选择信号ENsel,ADC 231a轮续产生与S/H 电路2311、2313、2315对应的数字信号。据此,时序控制器21可以分别并独立地补偿R像素电路271a、G像素电路271b,以及B像素电路271c。
请参见图3,其是根据本发明实施例的感测电路的方块图。感测电路40 包含电压感测模块41、选择模块43、放大器电路45,以及ADC 47。
为便于解释,此处假设图3的感测电路40支持两个通道,但本发明并不限于两个通道的情形。电压感测模块41包含与这两个通道对应的两个S/H电路411、413,且选择模块43包含一个解多工器435以及与这两个通道ch1, ch2对应的两个选择电路431、433。解多工器435电连接于选择电路431、433,其分别产生通道选择信号ENsel至选择电路431、433并对其致能。
选择电路431电连接于S/H电路411与放大器电路45,且选择电路433 电连接于S/H电路413与放大器电路45。由于与各个通道相关的信号与操作方式类似,此处仅以第一通道(ch1)为例。
选择电路431进一步包含第一选择开关swsel1与第二选择开关swsel2。第一选择开关swsel1与第二选择开关swsel2将S/H电路411的输出结果传导至放大器电路45。其后,放大器电路45产生输出电压差ΔVout至ADC 47。接着, ADC 47将输出电压差ΔVout转换为ADC码,并将ADC码传送至时序控制器。
请参见图4,其是与图3所示的感测电路相关信号的波形图。第一个波形为采样致能信号ENsam;第二个波形为放大模式信号ENamp;第三个波形为共用模式信号ENcmn;且第四波形和第五个波形为通道选择信号(ENsel(ch1), ENsel(ch2))。
在图4中,采样致能信号ENsam的电压在时点t1自低电压电平显著地转换至高电压电平;以及在时点t2自高电压电平显著地转换至低电压电平。在时点t1与t2间的采样期间Tsam,采样致能信号ENsam的电压维持在高电压电平。在采样期间Tsam,采样致能信号ENsam用于同时致能S/H电路411,413。
在采样期间Tsam,S/H电路411、413同时并分别对与其对应的模拟电压信号Vth(ch1)、Vth(ch2)进行采样。S/H电路411产生第一组通道的差动输入信号对(Vin+(ch1),Vin-(ch1)),且S/H电路413产生第二组通道的差动输入信号对 (Vin+(ch2),Vin-(ch2))。
由于S/H电路411、413同时接收采样致能信号ENsam,S/H电路411、 413以同步方式产生差动输入信号对(Vin+(ch1),Vin-(ch1)))、(Vin+(ch2),Vin-(ch2))。即,差动输入信号对(Vin+(ch1),Vin-(ch1))与差动输入信号对(Vin+(ch2),Vin-(ch2)) 同时产生。
时序控制器将共用模式信号ENcmn与放大模式信号ENamp传送至放大器电路45。根据本发明的实施例,增益放大器43可能操作在两种模式下,即,共用模式与放大模式。
当共用模式信号ENcmn为高电压电平时,增益放大器43操作于共用模式。此处将共用模式信号ENcmn为高电压电平的期间定义为共用模式期间Tcmn。在共用模式期间Tcmn,增益放大器43仅接收共用模式电压Vcmn而不接收任何差动输入信号。
另一方面,当放大模式信号ENamp为高电压位时,增益放大器43操作于放大模式。此处将放大模式信号ENamp为高电压电平的期间定义为放大模式期间Tamp。增益放大器43在放大模式期间Tamp接收差动输入信号对并加以放大,且增益放大器43依据在共用模式所接收的共用模式电压Vcmn,产生并输出经过放大后的信号。
如图4所示,共用模式信号ENcmn与放大模式信号ENamp周期性的在高电压电平与低电压电平间转换。为避免信号冲突,共用模式期间Tcmn与放大模式期间Tamp并不会重叠。实际应用时,共用模式信号ENcmn为低电压电平的期间,以及放大模式信号ENamp为低电压电平的期间可能短暂重叠。为简化说明,以下不特别说明此重叠期间。
如图4所示,时点t3与时点t4间为一共用模式期间Tcmn,时点t4与时点t5间为一放大模式期间Tamp;时点t5与时点t6间为另一个共用模式期间 Tcmn;以及,时点t6与时点t7间为另一个放大模式期间Tamp
在时点t3与时点t4之间的共用模式期间Tcmn,增益放大器操作于共用模式并接收共用模式电压Vcmn。在此期间,放大器电路45并不会放大也不会产生差动输出信号对。
在时点t4与时点t5之间的放大模式期间Tamp,放大器电路45操作于放大模式,并从选择电路431接收差动输入信号(Vin+,Vin-)。在这段期间,放大器电路45基于共用模式电压而对从选择电路431接收的差动输入信号对 (Vin+,Vin-)进行放大,并产生与第一通道对应的差动输出信号对(Vout+(ch1), Vout-(ch2))。
在时点t5与时点t6间的另一个共用模式期间Tcmn,增益放大器操作于共用模式并接收共用模式电压Vcmn。在此期间,放大器电路45并不会放大也不会产生差动输出信号对。
在时点t6与时点t7之间的另一个放大模式期间Tamp,放大器电路45操作在放大模式并从选择模块43接收差动输入信号对(Vin+,Vin-)。在这段期间,放大器电路45基于共用模式电压Vcmn而对从选择模块43接收的差动输入信号对(Vin+,Vin-)进行放大,并产生与第二通道对应的另一组差动输出信号对 (Vout+(ch2),Vout-(ch2))。
在采样期间Tsam,S/H电路411、413将与像素电路相对应的不同通道的模拟电压信号Vth(ch1)、Vth(ch2)转换为不同通道的差动输入信号对(Vin+(ch1), Vin-(ch1))、(Vin+(ch2),Vin-(ch2))。接着,传送差动输入信号(Vin+(ch1),Vin-(ch1))、 (Vin+(ch2),Vin-(ch2))。之后,在不同的放大模式期间Tamp,差动输入信号对被交错传送,并由放大器电路45进一步放大。关于S/H电路的设计与操作的细节,将在下方的本发明的实施例说明。为便于说明,本文仅说明一个S/H电路的情况。
请参见图5,其是实现感测电路的示意图。感测电路50包含S/H电路51、包含与S/H电路51对应的选择电路53的选择模块,以及放大器电路55。
S/H电路51经由第一接收节点Nrv1接收与像素电路对应的模拟电压信号 Vth,并将模拟电压信号Vth转换为差动输入信号对(Vin+,Vin-)。当选择电路 53接收高电压电平的通道选择信号ENsel时,便将差动输入信号对(Vin+,Vin-) 传送至放大器电路55。
S/H电路51包含第一充电路径51a与第二充电路径51b。第一充电路径51a包含第一输入开关swin1与第一采样电容Cs1。第一输入开关swin1电连接于第一接收节点Nrv1与第一感测节点Nsen1,且第一采样电容Cs1电连接于第一感测节点Nsen1与第二接收节点Nrv2
第二充电路径55包含第二输入开关swin2与第二采样电容Cs2。第二输入开关swin2电连接于第二接收节点Nrv2与第二感测节点Nsen2。第一采样电容 Cs1与第二采样电容Cs2持续从第二接收节点Nrv2接收参考电压Vref
第一充电路径51a在第一感测节点Nsen1与第一参考节点Nref1间,根据模拟电压信号Vth与参考电压Vref而选择性产生第一充电电位差ΔVin1。随着采样致能信号ENsam的电压变化,第一输入开关swin1将模拟电压信号Vth选择性传导至第一感测节点swin1。当第一输入开关swin1导通时,第一采样电容 Cs1经由第一输入开关swin1接收模拟电压信号Vth,且在第一采样电容Cs1的两端产生第一充电电位差ΔVin1。连带的,非反向差动输入信号Vin+在第一感测节点Nsen1产生。
第二充电路径51b将参考电压Vref选择性传导至第二感测节点Nsen2。随着采样致能信号ENsam的电压变化,第二输入开关swin2将参考电压Vref选择性传导至第二感测节点Nsen2。第二采样电容Cs2电连接于第二感测节点Nsen2与第二接收节点Nrv2。当第二输入开关swin2导通时,第二采样电容Cs2经由第二输入开关swin2接收参考电压Vref,且在并第二采样电容Cs2的两端产生第二充电电位差ΔVin2。连带的,反向差动输入信号Vin-在第二感测节点Nsen2产生。
如图5所示,当第二输入开关swin2导通时,第二采样电容Cs2的两个节点均接收参考电压Vref。因此,横跨于第二采样电容Cs2的第二充电电位差ΔVin2等于0。
与DAC的操作范围相较,模拟输入电压Vth的电压范围较高。因此,第一充电路径51a与第二充电路径51b可利用耐高压元件实现。与仅能承受低电压(例如,1.8伏特)的元件不同,这些耐高压元件可接收相对较大范围的输入电压(例如,0~9伏特)。实际应用时,这些耐高压元件可承受的电压会随着工艺不同而异。任何可耐受相对高电压的元件皆可被采用。举例而言,耐高压元件可承受的电压可为,达到9伏特、13.5伏特、18伏特等。需留意的是,这些电压值仅作为举例使用,并非本申请的限制。根据本发明的实施例,第一采样电容Cs1的电容值与第二采样电容Cs2的电容值相等。
第一选择开关swsel1电连接于第一感测节点Nsen1与第一输入节点Nin1。第二选择开关swsel2电连接于第二感测节点Nsen2与第二输入节点Nin2。第一选择开关swsel1与第二选择开关swsel分别将第一感测节点Nsen1的电压传导至第一输入节点Nin1,以及将第二感测节点Nsen2的电压传导至第二输入节点Nin2
在同一个选择电路53内的第一选择开关swsel1与第二选择开关swsel2由相同的通道选择信号ENsel控制。因此,差动输入信号对(Vin+,Vin-)被同时传送至增益放大器551。根据本发明构想的实施例,第一选择开关swsel1与第二选择开关swsel2采用耐高压元件。
放大器电路55包含第一输入节点Nin1、第二输入节点Nin2、第一输出节点Nout1、第二输出节点Nout2、增益放大器551、第一导通路径553与第二导通路径555。
增益放大器551经由第一输入节点Nin1与第二输入节点Nin2接收差动输入信号对(Vin+,Vin-),并在第一输出节点Nout1与第二输出节点Nout2产生差动输出信号对(Vout+,Vout-)。第一导通路径553电连接于第一输入节点Nin1与第一输出节点Nout1。第二导通路径555电连接于第二输入节点Nin2与第二输出节点Nout2
第一输入节点Nin1可为增益放大器551的非反向输入节点(+),且第二输入节点Nin2可为增益放大器551的反向输入节点(-)。第一输出节点Nout1可为增益放大器55的反向输出节点(-),且第二输出节点Nout2可为增益放大器551 的非反向输出节点(+)。
在图5中,第一导通路径553与第二导通路径555分别位于增益放大器 551的上方与下方。
第一导通路径553包含放大器开关swamp1、swamp2、swamp3以及放大器电容Camp1。放大器开关swamp1电连接于第一输入节点Nin1与放大器电容Camp1的正端节点。放大器开关swamp2电连接于第一分支节点Nbr1。放大器开关swamp3电连接于第一分支节点Nbr1与第一输出节点Nout1。放大器电容Camp1电连接于第一输入节点Nin1与第一分支节点Nbr1。随着增益放大器551的操作模式的不同,在第一导通路径553的放大器开关swamp1、swamp2、swamp3的导通状态也可能改变。
第二导通路径555包含放大器开关swamp4、swamp5、swamp6与放大器电容 Camp2。放大器开关swamp4电连接于第二输入节点Nin2。放大器开关swamp5电连接于第二分支节点Nbr2。放大器开关swamp6电连接于第二分支节点Nbr2与第二输出节点Nout2。放大器电容Camp2电连接于第二输入节点Nin2与第二分支节点Nbr2。随着增益放大器55的操作模式的不同,位在第二导通路径555的放大器开关swamp4、swamp5、swamp6的导通状态可能改变。
当增益放大器551操作在共用模式,第一导通路径553接收共用模式电压Vcmn1、Vcmn2,且第二导通路径555接收共用模式电压Vcmn3、Vcmn4。因此,放大器电容Camp1根据共用模式电压Vcmn1、Vcmn2而累积电荷,且放大器电容 Ccmp2根据共用模式电压Vcmn3,、Vcmn4而累积电荷。
当增益放大器551为放大模式时,第一导通路径553根据共用模式电压 Vcmn1、Vcmn2与差动输入信号对(Vin+,Vin-)产生反向差动输出信号Vout-,且第二导通路径555根据共用模式电压Vcmn3、Vcmn4与差动输入信号对(Vin+,Vin-) 产生非反向差动输出信号Vout+。反向差动输出信号Vout-根据差动输入信号对 (Vin+,Vin-)与累积 在放大器电容Camp1的电荷而产生,非反向差动输出信号 Vout+根据差动输入信号对(Vin+,Vin-)与累积 在放大器电容Camp2的电荷而产生。
根据本发明的实施例,第一导通路径553与第二导通路径555内的元件以对称的方式操作。放大器开关swamp1、swamp2、swamp3以及放大器电容Camp1的操作方式,分别对称于放大器开关swamp4、swamp5、swamp6以及放大器电容 Camp2的操作方式。
共用模式电压Vcmn1、Vcmn2、Vcmn3、Vcmn4的数值取决于数个参数,例如信号的变化(swing)与供应电压。举例来说,当增益放大器551的输入信号为差动信号时,增益放大器551当作缓冲器使用,且共用模式电压Vcmn1、Vcmn2、 Vcmn3、Vcmn4满足以下关系,即,Vcmn1=Vcmn3,且Vcmn2=Vcmn4。又如,当增益放大器551的输入信号非差动信号时,通过对共用模式电压Vcmn1、Vcmn2、 Vcmn3、Vcmn4的设定而产生差动输出信号(例如,Vcmn1=Vcmn3=Vcmn4=0.4V且 Vcmn2=0.9V)。
根据本发明的实施例,增益放大器551可以缩小差动输入信号对(Vin+、 Vin-)的电压,并使产生的差动输出信号对(Vout+,Vout-)的电压介于DAC的操作范围。差动输入信号对(Vin+,Vin-)的电压电平可能相对较高。因为与用于接收具有相对高电压电平的差动输入信号(Vin+,Vin-)的第一输入节点Nin1、第二输入节点Nin2相连的缘故,放大器开关swamp1、swamp4采用耐高压元件。
随着增益放大器551的操作模式的不同,放大器电路55的连接方式也跟着改变。图6及图7分别对应于操作在共用模式与放大模式的放大器电路55 的连接方式。
请参见图6,其是共用模式下的放大器电路的示意图。根据本发明的实施例,当增益放大器551操作在共用模式下时,增益放大器551并不会产生差动输出信号对(Vout+,Vout-)。
当增益放大器551操作在共用模式下,放大器开关swamp1,、swamp2为导通,且放大器开关swamp3为断开。放大器开关swamp1将共用模式电压Vcmn1传导至第一输入节点Nin1,且放大器开关swamp2将共用模式电压Vcmn2传导至第一分支节点Nbr1。因此,共用模式电压Vcmn1、Vcmn2对放大器电容Camp1充电。
当增益放大器551操作于共用模式,放大器开关swamp4、swamp5为导通,且放大器开关swamp6为断开。放大器开关swamp4将共用模式电压Vcmn3传导至第二输入节点Nin2,且放大器开关swamp5将共用模式电压Vcmn4传导至第二分支节点Nbr2。因此,共用模式电压Vcmn3、Vcmn4对放大器电容Camp2充电。
请参见图7,其是放大模式下的放大器电路的示意图。根据本发明的实施例,当增益放大器551为放大模式时,增益放大器551产生差动输出信号对(Vout+,Vout-)。
当增益放大器551操作在放大模式时,放大器开关swamp1、swamp2、swamp4、 swamp5为断开,且放大器开关swamp3、swamp6为导通。放大器开关swamp3导通第一分支节点Nbr1与第一输出节点Nout1,且放大器开关swamp6导通第二分支节点Nbr2与第二输出节点Nout2
请参见图8,其是增益放大器的结构的示意图。增益放大器551包含输入级电路5511与负载级电路5513。输入级电路5511电连接于第一输入节点 Nin1与第二输入节点Nin2。负载级电路551电连接于输入级电路551、第一输出节点Nout1与第二输出节点Nout2
请参见图9A,其是输入级电路使用N型金属氧化物半导体场效晶体管(N channelmetal-oxide-semiconductor field-effect transistor,简称为NMOS)晶体管的示意图。在图9A中,假设输入级电路5511包含电流源551a与差动输入晶体管M1a、M1b,其中差动输入晶体管M1a、M1b为可耐高电压的NMOS晶体管。
请参见图9B,其是输入级电路使用P型金属氧化物半导体场效(P channel metal-oxide-semiconductor field-effect transistor,简称为PMOS)晶体管的示意图。在图9B中,假设输入级电路5511包含电流源551b与差动输入晶体管 M2a、M2b,其中差动输入晶体管M2a、M2b为可耐高电压的PMOS晶体管。
如图9A、9B所示,差动输入晶体管M1a、M2a的栅极接收非反向差动输入信号Vin+,且差动输入晶体管M1b、M2b的栅极接收反向差动输入信号 Vin-。差动输入晶体管M1a、M2a与差动输入晶体管M1b、M2b的源极电连接于电流源551a、551b。差动输入晶体管M1a、M2a的漏极产生并提供第一中间级差动信号Vm+至负载级电路5513。差动输入晶体管M1b、M2b的漏极产生并提供第二中间级差动信号Vm-至负载级电路5513。
请参见图10,其是根据本发明的实施例所实现的S/H电路的示意图。如图10所示,第一输入开关swin1、第二输入开关swin2、第一选择开关swsel1、第二选择开关swsel2、放大器开关swamp1、swamp2、swamp3、swamp4、swamp5、swamp6可以是传输门(transmission gate)。
根据本发明的实施例,S/H电路内的元件,以及感测电路中的部分元件可采用耐高压元件。藉由耐高压元件的使用,增益放大器可直接接收具有高电压的差动输入信号对(Vin+,Vin-)。其后,增益放大器可直接产生具有相对较小电压范围的差动输出信号对(Vout+,Vout-)。差动输出信号对(Vout+,Vout-) 与差动输入信号对(Vin+,Vin-)之间的放大比率(例如,2/3),可依据不同感测电路的规格的要求而任意设计,无须额外使用电压缩小化电路。因为不需使用电压缩小化电路的缘故,采用耐高压元件实现感测电路的做法仅需使用较小的面积。由于显示面板所包含的像素电路很多,采用此种做法让感测电路所需面积大幅缩小。
尽管前述的说明以OLED显示面板为例,但本发明的应用并不以此为限。因此,若其他类型的显示装置具有需要被降压的模拟电压信号时,本发明的实施例可进一步修改并应用于其上。
综上所述,虽然本发明已以实施例公开如上,然其并非用以限定本发明。本发明所属技术领域中的技术人员,在不脱离本发明的精神和范围内,当可作各种的更动与润饰。因此,本发明的保护范围当视后附的权利要求所界定者为准。

Claims (16)

1.一种显示驱动器的感测电路,包含:
采样保持电路,其将与像素电路对应的模拟电压信号转换为差动输入信号对,该采样保持电路包含:
第一充电路径,其在第一感测节点与第一参考节点间,依据该模拟电压信号与参考电压而选择性产生第一充电电位差,其中该差动输入信号对中的一个差动输入信号产生于该第一感测节点;以及
第二充电路径,其将该参考电压选择性传导至第二感测节点,其中该差动输入信号对的另一个差动输入信号在该第二感测节点产生,其中该第一充电路径与该第二充电路径采用耐高压元件;
增益放大器,电连接于该采样保持电路,包含第一输入节点、第二输入节点、第一输出节点以及第二输出节点,其是经由该第一输入节点与该第二输入节点接收该差动输入信号对,以及在该第一输出节点与该第二输出节点产生差动输出信号对,其中该增益放大器包含电连接于该第一输入节点与该第二输入节点的输入级电路,该输入级电路包含电流源、第一差动输入晶体管以及第二差动输入晶体管,以及该第一差动输入晶体管与该第二差动输入晶体管采用该耐高压元件;
第一导通路径,电连接于该第一输入节点与该第一输出节点,其是于该增益放大器为共用模式时,接收第一共用模式电压与第二共用模式电压,以及于该增益放大器为放大模式时,根据该第一共用模式电压、该第二共用模式电压与该差动输入信号对,产生该差动输出信号对的一个差动输出信号;以及
第二导通路径,电连接该第二输入节点与该第二输出节点,其是于该增益放大器为该共用模式时,接收第三共用模式电压与第四共用模式电压,以及于该增益放大器为该放大模式时,根据该第三共用模式电压、该第四共用模式电压,以及该差动输入信号对,产生该差动输出信号对的该另一个差动输出信号。
2.如权利要求1所述的感测电路,其中还包含:
选择模块,包含解多工器与多个选择电路,其中各该选择电路包含:
第一选择开关,电连接于该解多工器、该第一感测节点与该第一输入节点,其在通道选择信号为第一电压电平时,将该差动输入信号对的该一个差动输入信号传导至该第一输入节点;以及
第二选择开关,电连接于该解多工器、该第二感测节点与该第二输入节点,其在该通道选择信号为该第一电压电平时,将该差动输入信号对的该另一个差动输入信号传导至该第二输入节点,
其中该第一选择开关与该第二选择开关采用该耐高压元件,且该第一选择开关与该第二选择开关自该解多工器接收该通道选择信号。
3.如权利要求1所述的感测电路,其中该第一充电路径包含:
第一输入开关,电连接于第一接收节点与该第一感测节点,其是根据采样致能信号而将该模拟电压信号传导至该第一感测节点;以及
第一采样电容,电连接于该第一感测节点与第二接收节点,其是于该第一输入开关导通时,经由该第一输入开关接收该模拟电压信号并产生该第一充电电位差。
4.如权利要求3所述的感测电路,其中该第二充电路径包含:
第二输入开关,电连接于该第二接收节点与该第二感测节点,其是根据该采样致能信号而将该参考电压传导至该第二感测节点;以及
第二采样电容,电连接于该第二感测节点与该第二接收节点,其是于该第二输入开关导通时,通过该第二输入开关接收该参考电压并产生第二充电电位差。
5.如权利要求4所述的感测电路,其中该第一采样电容与该第二采样电容经由该第二接收节点而持续接收该参考电压,且该第二充电电位差等于0。
6.如权利要求4所述的感测电路,其中该第一采样电容的电容值等于该第二采样电容的电容值。
7.如权利要求1所述的感测电路,其中该增益放大器电连接于模拟数字转换器,其中该模拟数字转换器接收该差动输出信号对并据以产生数字信号。
8.如权利要求7所述的感测电路,其中电连接于时序控制器以及包含多个像素电路的一显示面板,其中该感测电路自所述像素电路中的一个像素电路接收该模拟电压信号,并将该数字信号传导至该时序控制器,且该时序控制器根据该数字信号而补偿所述像素电路的该一个像素电路。
9.如权利要求1所述的感测电路,其中
该第一差动输入晶体管与该第二差动输入晶体管为P型金属氧化物半导体场效晶体管;或
该第一差动输入晶体管与该第二差动输入晶体管为N型金属氧化物半导体场效晶体管。
10.如权利要求1所述的感测电路,其中该增益放大器还包含:
负载级电路,电连接于该输入级电路、该第一输出节点,以及该第二输出节点。
11.如权利要求1所述的感测电路,其中该第一导通路径包含:
第一放大器开关,电连接于该第一输入节点,其在该增益放大器为该共用模式时,将该第一共用模式电压传导至该第一输入节点,其中该第一放大器开关采用该耐高压元件;
第二放大器开关,电连接于第一分支节点,其是于该增益放大器为该共用模式时,将该第二共用模式电压传导至该第一分支节点;
第三放大器开关,电连接于该第一分支节点与该第一输出节点,其在该增益放大器为该放大模式时,导通该第一分支节点与该第一输出节点;以及
第一放大器电容,电连接该第一输入节点与该第一分支节点。
12.如权利要求11所述的感测电路,其中
该第一放大器电容在该增益放大器为该共用模式时,根据该第一共用模式电压与该第二共用模式电压而累积电荷;以及
该差动输出信号对的该一个差动输出信号在该增益放大器为该放大模式时,根据该差动输入信号对与累积在该第一放大器电容的电荷而产生。
13.如权利要求1所述的感测电路,其中该第二导通路径包含:
第四放大器开关,电连接于该第二输入节点,其在该增益放大器为该共用模式时,将该第三共用模式电压传导至第二输入节点,其中该第四放大器开关采用该耐高压元件;
第五放大器开关,电连接于第二分支节点,其在该增益放大器为该共用模式时,将该第四共用模式电压传导至该第二分支节点;
第六放大器开关,电连接该第二分支节点与该第二输出节点,其是于该增益放大器为该放大模式时,导通该第二分支节点传导与该第二输出节点;以及
第二放大器电容,电连接该第二输入节点与该第二分支节点。
14.如权利要求13所述的感测电路,其中
该第二放大器电容在该增益放大器为该共用模式时,根据该第三共用模式电压与该第四共用模式电压而累积电荷;以及
该差动输出信号对的该另外一个差动输出信号在该增益放大器为该放大模式时,根据该该差动输入信号对以及累积于该第二放大器电容的电荷而产生。
15.如权利要求1所述的感测电路,其中该第一输入节点为该增益放大器的非反向输入节点,且该第二输入节点为该增益放大器的反向输入节点。
16.如权利要求1所述的感测电路,其中该耐高压元件可承受18伏特。
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