CN110556077B - 电压输出电路、驱动电路、显示面板及显示装置 - Google Patents
电压输出电路、驱动电路、显示面板及显示装置 Download PDFInfo
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Abstract
本申请公开了一种电压输出电路、驱动电路、显示面板及显示装置,其中,电压输出电路,包括多个电阻串联形成的第一分压电阻串,所述第一分压电阻串包括多个电压输入端和多个电压输出端,所述电压输入端的数量大于所述电压输出端的数量,所述第一分压电阻串包括第一分压段和第二分压段;所述第一分压段中至少部分相邻的所述电压输出端之间间隔两个以上所述电阻,每两相邻的所述电压输出端之间间隔的两个以上的所述电阻中至少其中一个并联有开关元件;所述第二分压段中各相邻的所述电压输出端之间均间隔一个所述电阻。上述方案解决了现有技术中采用线性插值获得的GAMMA电压高于目标电压,造成低灰阶显示亮度不足的问题。
Description
技术领域
本发明一般涉及显示技术领域,具体涉及一种电压输出电路、驱动电路、显示面板及显示装置。
背景技术
AMOLED(Active-Matrix Organic Light Emitting Diode;有源矩阵有机发光二极管)在显示图片时,需要满足灰阶与亮度的GAMMA 2.2曲线关系。
目前,在相邻电压输入点(亦可称为绑点)通过线性插值的方式获得低灰阶GAMMA电压,但是由于线性插值得到的GAMMA电压高于目标电压,因此得到的亮度曲线低于GAMMA2.2曲线,造成低灰阶显示亮度不足。
发明内容
本申请期望提供一种电压输出电路、驱动电路、显示面板及显示装置,用以解决现有技术中采用线性插值获得的GAMMA电压高于目标电压,造成低灰阶显示亮度不足的问题。
第一方面,本发明提供一种电压输出电路,包括多个电阻串联形成的第一分压电阻串,所述第一分压电阻串包括多个电压输入端和多个电压输出端,所述电压输入端的数量大于所述电压输出端的数量,所述第一分压电阻串包括第一分压段和第二分压段;
所述第一分压段中至少部分相邻的所述电压输出端之间间隔两个以上所述电阻,每两相邻的所述电压输出端之间间隔的两个以上的所述电阻中至少其中一个并联有开关元件;
所述第二分压段中各相邻的所述电压输出端之间均间隔一个所述电阻。
进一步地,所述开关元件为晶体管。
进一步地,各所述电阻的阻值相等。
第二方面,本发明提供一种驱动电路,包括第一分压电阻单元、多路选择单元及第二分压电阻单元,所述第一分压电阻单元的电压输出端与所述多路选择单元的输入端连接,所述多路选择单元的输出端与所述第二分压电阻单元的电压输入端连接,所述第二分压电阻单元为上述的电压输出电路。
进一步地,第一分压电阻单元包括多个串联的电阻。
进一步地,所述多路选择单元包括多个第一多路选择器,各所述第一多路选择器的输入端与所述第一分压电阻单元的电压输出端连接,各所述第一多路选择器的输出端连接一第一电压跟随器,各所述第一电压跟随器的输出端与所述第二分压电阻单元对应的电压输入端一一对应连接;
至少部分所述第一电压跟随器的输出端连接有第二分压电阻串,所述第二分压电阻串的电压输出端连接有第二多路选择器,第二多路选择器的输出端连接一第二电压跟随器,各所述第二电压跟随器的输出端与所述第二分压电阻单元对应的电压输入端一一对应连接。
第三方面,本发明提供一种显示面板,包括上述的驱动电路。
第四方面,本发明提供一种显示装置,包括上述的显示面板。
上述方案,可以通过开关元件的开启与闭合,较为便捷的改变对应灰阶的分压电阻值,提高了电压设定的灵活性,较现有线性插值的方案,本方案实现了非线性调节灰阶电压的目的,且调节后的灰阶电压可以低于或趋近目标电压,使得显示面板显示时得到的亮度曲线符合GAMMA 2.2曲线,提高了低灰阶显示亮度。
附图说明
通过阅读参照以下附图所作的对非限制性实施例所作的详细描述,本申请的其它特征、目的和优点将会变得更明显:
图1为实施本发明实施例电压输出电路的原理图;
图2为实施本发明实施例驱动电路的原理图;
图3为采用线性插值得到的亮度-灰阶图;
图4为本发明实施例得到的亮度-灰阶图;
图5为采用线性插值得到灰阶-GAMMA电压图;
图6为本发明实施例得到灰阶-GAMMA电压图。
具体实施方式
下面结合附图和实施例对本申请作进一步的详细说明。可以理解的是,此处所描述的具体实施例仅仅用于解释相关发明,而非对该发明的限定。另外还需要说明的是,为了便于描述,附图中仅示出了与发明相关的部分。
需要说明的是,在不冲突的情况下,本申请中的实施例及实施例中的特征可以相互组合。下面将参考附图并结合实施例来详细说明本申请。
本文涉及的电压输出电路、驱动电路可以用于LCD(Liquid Crystal Display;液晶显示器)、OLED(Organic Light-Emitting Diode;有机发光二极管)的GAMMA(伽马)校正,以使显示器件的亮度曲线满足或趋近GAMMA 2.2曲线。
如图1所示,本发明实施例提供的电压输出电路,包括多个电阻R串联形成的第一分压电阻串,第一分压电阻串包括多个电压输入端0gray、1gray、15gray、31gray、64gray……205gray、255gray和多个电压输出端V0、V1、V2、V3、V4……V254、V255,电压输入端的数量大于电压输出端的数量,第一分压电阻串包括第一分压段和第二分压段;第一分压段中至少部分相邻的电压输出端之间间隔两个以上电阻R,每两相邻的电压输出端之间间隔的两个以上的电阻R中至少其中一个并联有开关元件;第二分压段中各相邻的电压输出端之间均间隔一个电阻R。
如图1中,右侧V1-V15的具体电路连接图是左侧V1-V15的放大图,可以理解,左侧V1-V15以一个电阻来进行简化,但其具体的电路连接构成为右侧V1-V15的具体电路连接图。
此外,V15-V31、V31-V64……V205-V255每个区间段均是有多个电压输出端,图中省略未画出,区间段V15-V31实际是包括V15、V16、V17、V18……V30、V31这17个电压输出端,其他区间与此区间同理。
这里所说的电阻R可以是物理结构独立的一个电阻,也可以是一长条电阻中的一段,或由多个子电阻串联形成的一个电阻,子电阻的形式可以与电阻相同,区别可以仅在于阻值不同。
作为其中一种可实现方式,具有多个电压输入端(亦可称为绑点),依次记做0gray、1gray、15gray、31gray、64gray……205gray、255gray可以只在1gray与15gray之间,也即V1-V15的区间段中的部分电阻R中设置并联的开关元件,如V1-V5之间,相邻的电压输出端之间间隔一个电阻R,V5-V13之间,相邻的电压输出端之间间隔两个电阻,当然还可以多于两个电阻,V13-V15之间,相邻的电压输出端之间间隔一个电阻。在V5-V13之间,相邻的电压输出端之间间隔的两个电阻中的其中一个并联一个开关元件,依次表示为SW1、SW2、SW3……SW8,通过开关元件的打开与闭合来控制对应的电阻短路或接入电路。当然还可以是其他的区间段,如V1-V32的区间段中的部分电阻R中设置并联的开关元件等,具体区间段的选择,根据实际的电压调节精细度需要而定。
上述方案,可以通过开关元件的开启与闭合,较为便捷的改变对应灰阶的分压电阻值,提高了电压设定的灵活性,较现有线性插值的方案,本方案实现了非线性调节灰阶电压的目的,且调节后的灰阶电压可以低于或趋近目标电压,使得显示面板显示时得到的亮度曲线符合GAMMA 2.2曲线,提高了低灰阶显示亮度。
进一步地,开关元件为晶体管。该晶体管均可以为薄膜晶体管或场效应管,其可以是p型,也可以是n型。p型与n型的主要区别在于,p型为低电平导通,n型为高电平导通。
进一步地,各电阻R的阻值相等。
如图1所示,在本发明的其中一个方案中V1-V15之间共串联了22个电阻,而在现有技术中通过线性插值的方案中,V1-V15之间仅有14个电阻。以下以两电压输入端V1与V15(亦可称为绑点1gray与15gray)之间的V8、V11为例进行说明。
其中,现有技术中采用线性差值方案中:
V8=7/14(V15-V1)=0.5△V;
V11=10/14(V15-V1)=0.714△V;
△V=V15-V1;
也即,如图5所述,采用线性差值方案其电压输出端的电压与灰阶之间是线性关系。其中,横坐标表示灰阶Gray1-15,纵坐标表示电压输出端的电压值VoltageV1-V15。
而采用本发明方案,在开关元件均开启的情况下,即V1-V15之间的电阻均接入电路的情况下:
V8=10/22(V15-V1)=0.454△V;
V11=16/22(V15-V1)=0.727△V
可见,本发明方案,在开关元件开启的情况下,V8处的电压小于现有技术中V8的电压,V11处的电压大于现有技术中V11的电压,为了使得到的灰阶亮度曲线符合或趋近GAMMA2.2曲线,虽然本发明中V8处的电压小于现有技术中V8的电压,但是其还可以继续降低,例如闭合若干个V1-V8之间的开关元件,如闭合两个,此时V8=8/20△V=0.4△V,电压下降成功,依次规律,通过调节开关元件的闭合数量来控制V8的电压,直至V8处的灰阶亮度曲线符合或趋近GAMMA2.2曲线。在开关元件开启的情况下,V11处的电压大于现有技术中V11的电压,例如闭合若干个V1-V11之间的开关元件,如闭合一个,此时V11=15/21△V=0.714△V,电压下降成功,依次规律,通过调节开关元件的闭合数量来控制V11的电压,直至V11处的灰阶亮度曲线符合或趋近GAMMA 2.2曲线。如图4所述,经过上述开关元件的闭合,最终获得了符合或趋近GAMMA 2.2曲线的灰阶亮度曲线。
通过开关元件的闭合来调节电压输出端的电压值,如图6所示,电压输出端的电压与灰阶之间是非线性关系。其中,横坐标表示灰阶Gray1-15,纵坐标表示电压输出端的电压值VoltageV1-V15。
第二方面,如图2所示,本发明实施例提供一种驱动电路,包括第一分压电阻单元1、多路选择单元及第二分压电阻单元,第一分压电阻单元1的电压输出端与多路选择单元的输入端连接,多路选择单元的输出端与第二分压电阻单元的电压输入端连接,第二分压电阻单元为上述实施例的电压输出电路。
多路选择单元根据选择信号来选择第一分压电阻单元1的电压输出端。
该驱动电路的效果及原理参见上述电压输出电路的实施例,这里不再赘述。
进一步地,第一分压电阻单元1包括多个串联的电阻。
进一步地,多路选择单元包括多个第一多路选择器2,各第一多路选择器2的输入端与第一分压电阻单元1的电压输出端连接,各第一多路选择器2的输出端连接一第一电压跟随器3,各第一电压跟随器3的输出端与第二分压电阻单元对应的电压输入端一一对应连接;至少部分第一电压跟随器3的输出端连接有第二分压电阻串5,第二分压电阻串5的电压输出端连接有第二多路选择器4,第二多路选择器4的输出端连接一第二电压跟随器6,各第二电压跟随器6的输出端与第二分压电阻单元对应的电压输入端一一对应连接。
由于第一分压电阻单元1两端电压VGEGOUT、VGS之间电压输出端的电压信号在一个纯电阻+开关的网络中传递,为了提高其驱动能力,在对应的线路中设置了第一电压跟随器3及第二电压跟随器6。
第三方面,本发明提供一种显示面板,包括上述的驱动电路。
显示面板可以是LCD面板或OLED面板。
第四方面,本发明提供一种显示装置,包括上述的显示面板。
显示装置可以是手机、电脑显示器、电视、平板、增强现实眼镜等。
以上描述仅为本申请的较佳实施例以及对所运用技术原理的说明。本领域技术人员应当理解,本申请中所涉及的发明范围,并不限于上述技术特征的特定组合而成的技术方案,同时也应涵盖在不脱离发明构思的情况下,由上述技术特征或其等同特征进行任意组合而形成的其它技术方案。例如上述特征与本申请中公开的(但不限于)具有类似功能的技术特征进行互相替换而形成的技术方案。
Claims (4)
1.一种驱动电路,包括第一分压电阻单元、多路选择单元及第二分压电阻单元,所述第一分压电阻单元的电压输出端与所述多路选择单元的输入端连接,所述多路选择单元的输出端与所述第二分压电阻单元的电压输入端连接,其特征在于,所述第二分压电阻单元为电压输出电路;所述电压输出电路,包括多个电阻串联形成的第一分压电阻串,所述第一分压电阻串包括多个电压输入端和多个电压输出端,其特征在于,所述电压输入端的数量大于所述电压输出端的数量,所述第一分压电阻串包括第一分压段和第二分压段;
所述第一分压段中至少部分相邻的所述电压输出端之间间隔两个以上所述电阻,每两相邻的所述电压输出端之间间隔的两个以上的所述电阻中至少其中一个并联有开关元件;
所述第二分压段中各相邻的所述电压输出端之间均间隔一个所述电阻;
所述多路选择单元包括多个第一多路选择器,各所述第一多路选择器的输入端与所述第一分压电阻单元的电压输出端连接,各所述第一多路选择器的输出端连接一第一电压跟随器,各所述第一电压跟随器的输出端与所述第二分压电阻单元对应的电压输入端一一对应连接;
至少部分所述第一电压跟随器的输出端连接有第二分压电阻串,所述第二分压电阻串的电压输出端连接有第二多路选择器,第二多路选择器的输出端连接一第二电压跟随器,各所述第二电压跟随器的输出端与所述第二分压电阻单元对应的电压输入端一一对应连接。
2.根据权利要求1所述的驱动电路,其特征在于,第一分压电阻单元包括多个串联的电阻。
3.一种显示面板,其特征在于,包括权利要求1-2任一项所述的驱动电路。
4.一种显示装置,其特征在于,包括权利要求3所述的显示面板。
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