CN105590610B - 液晶面板驱动***中的切角电路 - Google Patents
液晶面板驱动***中的切角电路 Download PDFInfo
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- 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
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Abstract
本发明公开了一种液晶面板驱动***中的切角电路,其特征在于,所述切角电路包括:控制器,用于向信号转换器提供第一信号;信号转换器,用于将所述第一信号转换成用于控制放电电路放电的第二信号,将所述第二信号提供给放电电路;放电电路,用于根据信号转换器提供的第二信号产生切角电路的切角电压。根据所述切角电路,不仅可以自动调节切角电压,还精简了***电路,降低了成本。
Description
技术领域
本发明总体说来涉及液晶面板驱动领域,更具体地讲,尤其涉及一种液晶面板驱动***中的切角电路。
背景技术
为改善液晶面板(LCD)的均齐度,需要降低回馈电压与线变效应,通常,在现有的LCD的驱动架构中,为降低回馈电压与线变效应,可以在LCD的驱动***中加入切角电路,并通过切角电路来调整驱动电压波形的斜率(即产生切角),由于现有的切角电路的切角电压固定,因此,只能增加***电路并通过变更***电阻的方式来调整切角电压(如图1所示),但是,这种方式不仅使得***电路布线较为繁琐,还提高了切角电路的成本。
发明内容
有鉴于此,本发明目的是提供一种液晶面板驱动***中的切角电路,以解决现有的通过在电源管理芯片外部布置***电阻来调整切角电压的方式使电源管理芯片***电路布线较为繁琐以及成本较高的缺陷。
本发明示例性实施例提供一种液晶面板驱动***中的切角电路,其特征在于,所述切角电路包括:控制器,用于向信号转换器提供第一信号;信号转换器,用于将所述第一信号转换成用于控制放电电路放电的第二信号,将所述第二信号提供给放电电路;放电电路,用于根据信号转换器提供的第二信号产生切角电路的切角电压。
可选地,所述放电电路包括多个并联的电流源以及与每个电流源相应的控制电流源导通或截止的开关,其中,每个开关响应于与其相应的第二信号导通或截止,所述多个并联的电流源的输出端彼此相连以输出切角电路的切角电压。
可选地,所述控制器为时序控制器。
可选地,所述信号转换器和放电电路设置于电源管理芯片中。
可选地,所述控制器基于并行通信协议向信号转换器提供第一信号。
可选地,每个第一信号包括一个时钟信号和一个数据信号。
根据本发明示例性实施例提供的液晶面板驱动***中的切角电路,不仅可以自动调节切角电压,还精简了***电路,降低了成本。
附图说明
通过下面结合附图进行的详细描述,本发明示例性实施例的上述和其它目的、特点和优点将会变得更加清楚,其中:
图1示出现有技术中电源管理芯片的***电路中设置有***电阻的结构图;
图2示出根据本发明示例性实施例的液晶面板驱动***中的切角电路的框图;
图3示出根据本发明示例性实施例的液晶面板驱动***中的切角电路的示例。
图4示出根据本发明示例性实施例的切角电压的时序图;
图5示出现有技术中型号为HX5562R11U的电源管理芯片的内部框图;
图6示出根据本发明的示例性实施例的液晶面板驱动***中的切角电路的示例。
具体实施方式
现在,将参照附图更充分地描述不同的示例实施例,其中,一些示例性实施例在附图中示出,其中,相同的标号始终表示相同的部件。
图2示出根据本发明示例性实施例的液晶面板驱动***中的切角电路的框图。
如图2所示,根据本发明的液晶面板驱动***中的切角电路包括:控制器10、信号转换器20和放电电路30。
具体说来,控制器10用于向信号转换器20提供第一信号。
这里,所述控制器10可基于并行通信协议向信号转换器20提供第一信号。当所述控制器10为时序控制器时,每个第一信号可包括一个时钟信号和一个数据信号,其中,所述时钟信号和数据信号可分别通过时序控制器的时钟引脚(SCL pin)和数据引脚(SDA pin)输出。
信号转换器20用于将所述第一信号转换成用于控制放电电路30放电的第二信号,将所述多个第二信号提供给放电电路30。
这里,作为示例,信号转换器20可将所述第一信号转换成用于控制放电电路30放电的第二信号。具体说来,当所述信号转换器20的接口(例如,SCL pin和SDA pin)接收到一个第一信号时,可将第一信号解析成第二信号,例如,当一个第一信号中的时钟信号和数据信号都为1,信号转换器20可将该第一信号解析为一个高电平信号。类似地,当按时间顺序接收多个第一信号时,信号转换器20可解析出与所述每个第一信号对应的第二信号。这里,应理解,信号转换器20可通过现有的任何可以实现上述功能的元件构成。
放电电路30用于根据信号转换器20提供的第二信号产生切角电路的切角电压。
作为示例,所述放电电路30可包括多个并联的电流源以及与每个电流源相应的控制电流源导通或截止的开关,其中,每个开关响应于与其相应的第二信号导通或截止,所述多个并联的电流源的输出端彼此相连以输出切角电路的切角电压。这里,作为示例,所述与每个电流源相应的开关可以是被用作电子开关的NMOS管、PMOS管等场效应管。具体说来,当开关导通时,与该导通的开关相应的电流源放电,使得所述切角电路的切角电压发生改变。例如,当开关为NMOS管时,在接收到高电平信号时导通,与该导通的NMOS管串联的电流源放电,使得所述切角电路的切角电压发生改变。
通过上述方式,可以自动地调节切角电压。
图3示出根据本发明示例性实施例的液晶面板驱动***中的切角电路的示例。
参照图3,作为示例,所述信号转换器20和放电电路30可设置于电源管理芯片100中。具体说来,切角电路中的放电电路30可包括多个电流源,例如,图3中切角电路中的放电电路30可包括7个并联的电流源A1-A7,当然,也可以更多或少,但至少两个以上,每个电流源都串联一个开关,作为示例,所述开关为NMOS管,每个开关(即,Q1-Q7)的控制端分别连接信号转换器20相应的输出引脚a1-a7,例如,信号转换器20的a1输出引脚连接电流源A1所对应的开关Q1的控制端。此外,包括电流源A1-A7的放电电路30的总输出线(即,多个并联的电流源的输出端彼此相连后的总输出线)可连接电源管理芯片100的切角电压输出端VGHM。此外,作为示例,控制器10可设置于电源管理芯片100之外,这里,在控制器10为时序控制器T-CON的情况下,信号转换器20的时钟引脚与数据引脚与时序控制器T-CON的时钟引脚与数据引脚相连。信号转换器20的控制开关引脚b用于接收控制信号。
以下,对根据本发明示例性实施例的液晶面板驱动***中的切角电路的工作原理进行描述。
具体说来,时序控制器T-CON可以通过并行通信方式对电源管理芯片100中的信号转换器20进行编程控制,例如,时序控制器T-CON可根据用户设置通过时钟引脚和数据引脚向信号转换器20发送第一信号,信号转换器20可在接收到控制信号时,通过时钟引脚和数据引脚接收时序控制器T-CON发送的第一信号,并对所述第一信号进行解析,例如,当第一信号包括的时钟信号和数据信号为1时,信号转换器20可将该第一信号解析为一个高电平信号。类似地,当有多个(例如,7个)第一信号时,信号转换器20可按时间顺序将多个第一信号解析为多个控制与电流源串联的开关的第二信号,这里,作为示例,信号转换器20可将解析后的多个控制与电流源串联的开关的第二信号进行存储,当到达预定数量(例如,7个)时,将所述多个第二信号提供给放电电路30中与每个电流源串联的开关,使每个开关响应于与其相应的信号导通或截止,从而输出切角电路的切角电压。
图4示出根据本发明示例性实施例的切角电压的时序图。
由于放电电路30通过一次接收多个第二信号以形成一次放电斜率,再次接收多个第二信号时,放电斜率可以再次发生改变,当然,可以推断,如图4所示,通过发送更多次第二信号,可以形成更多甚至接近弧线形的圆角,当到达一定程度时,将不再变化。
下面,将以所述切角电路应用于HX5562R11U型号电源管理芯片100为例来进行描述,图5示出现有技术中型号为HX5562R11U的电源管理芯片100的内部框图。图6示出根据本发明的示例性实施例的液晶面板驱动***中的切角电路的示例。
参照图5和图6,作为示例,可将信号转换器20和放电电路30替代图2中的驱动电路PRE_DRV101和PMOS管Q2 102,此外,控制器10设置于电源管理芯片100外。这里,控制器10、信号转换器20和放电电路30与图3中相同。具体说来,信号转换器20的时钟引脚与数据引脚分别与时序控制器T-CON的时钟引脚与数据引脚相连,信号转换器20的控制开关引脚b与或门电路的输出端相连,放电电路30中的与每个并联的电流源相应的开关的输出端与信号转换器20的输出引脚相连,放电电路30的总输出线连接节点B,这里,应注意,本发明不限于此,图6中的其他电路的元件的连接关系与现有技术中的图5中的元件的连接关系相同,在此就不再赘述。此外,应理解,电源管理芯片100还可以是除了HX5562R11U型号芯片之外的其他电源管理芯片。
综上所述,根据本发明示例性实施例的液晶面板驱动***中的切角电路,不仅可以自动地调节切角电压,还精简了***电路,降低了成本。
显然,本发明的保护范围并不局限于上诉的具体实施方式,本领域的技术人员可以对发明进行各种改动和变型而不脱离本发明的精神和范围。这样,倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内,则本发明也意图包含这些改动和变型在内。
Claims (4)
1.一种液晶面板驱动***中的切角电路,其特征在于,所述切角电路包括:
控制器,用于向信号转换器提供第一信号,所述第一信号包括一个时钟信号和一个数据信号;
信号转换器,用于将所述第一信号转换成用于控制放电电路放电的第二信号,将所述第二信号提供给放电电路;
放电电路,用于根据信号转换器提供的第二信号产生切角电路的切角电压;
其中,所述信号转换器和放电电路设置于电源管理芯片中,所述信号转换器的时钟引脚与数据引脚分别与所述控制器的时钟引脚与数据引脚相连,所述信号转换器的控制开关引脚与所述电源管理芯片中的或门电路的输出端相连,所述放电电路的与每个并联的电流源相应的开关的输出端与所述信号转换器的输出引脚对应相连。
2.如权利要求1所述的切角电路,其特征在于,所述放电电路包括多个并联的电流源以及与每个电流源相应的控制电流源导通或截止的开关,其中,每个开关响应于与其相应的第二信号导通或截止,所述多个并联的电流源的输出端彼此相连以输出切角电路的切角电压。
3.如权利要求1所述的切角电路,其特征在于,所述控制器为时序控制器。
4.如权利要求1所述的切角电路,其特征在于,所述控制器基于并行通信协议向信号转换器提供第一信号。
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CN201610155912.5A CN105590610B (zh) | 2016-03-18 | 2016-03-18 | 液晶面板驱动***中的切角电路 |
US15/110,190 US10186227B2 (en) | 2016-03-18 | 2016-05-06 | Corner cut circuit in liquid crystal panel driving system |
PCT/CN2016/081200 WO2017156838A1 (zh) | 2016-03-18 | 2016-05-06 | 液晶面板驱动***中的切角电路 |
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CN102956215A (zh) * | 2012-11-23 | 2013-03-06 | 深圳市华星光电技术有限公司 | 液晶面板的驱动方法及驱动电路 |
CN104575410A (zh) * | 2013-10-18 | 2015-04-29 | 联咏科技股份有限公司 | 省电方法及其相关液晶显示器 |
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CN102034440B (zh) * | 2009-09-24 | 2012-12-19 | 瑞鼎科技股份有限公司 | 栅极驱动器及其操作方法 |
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CN102314846B (zh) * | 2011-09-06 | 2013-05-01 | 深圳市华星光电技术有限公司 | Lcd驱动***中的切角电路 |
US9230502B2 (en) * | 2012-02-13 | 2016-01-05 | Semiconductor Energy Laboratory Co., Ltd. | Display device having blocking circuit for extracting start pulse from signal |
US20140145922A1 (en) * | 2012-11-23 | 2014-05-29 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Lcd panel driving method and driving circuit |
US20140340291A1 (en) * | 2013-05-14 | 2014-11-20 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Chamfered Circuit and Control Method Thereof |
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CN103413534B (zh) * | 2013-07-31 | 2015-11-25 | 南京中电熊猫液晶显示科技有限公司 | 液晶显示器及其栅极信号的驱动方法 |
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CN104575410A (zh) * | 2013-10-18 | 2015-04-29 | 联咏科技股份有限公司 | 省电方法及其相关液晶显示器 |
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