CN117037693A - 一种oled显示面板的驱动方法 - Google Patents
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- 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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- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
Abstract
本发明公开了一种OLED显示面板的驱动方法,所述OLED显示面板包括8T1C LTPO驱动电路,所述驱动方法包括:S1:预设N个不同亮度的显示画面;S2:根据待显示亮度所处的亮度区间选择对应的显示画面;S3:通过PWM调光使所述显示画面的实际显示效果为待显示亮度。本发明通过在AP端增加亮度不同的画面,DDIC可以根据待显示亮度所处的亮度区间选择对应的画面,再通过PWM调光获取所需的亮度效果。
Description
技术领域
本发明涉及OLED显示驱动领域,具体为一种OLED显示面板的驱动方法。
背景技术
目前OLED显示领域(消费品手机、穿戴、笔记本、车载)array阵列单元为了消除制程波动带来的Vth的差异(Vth有差异会带来显示mura)基本采用7T1C LTPS或8T1C LTPO像素电路(具有vth补偿功能)作为OLED显示面板的驱动电路。
如图1所示,以7T1C为例,T1时间做初始化,给开关管M3栅极做复位,并对电路节点N4即OLED的阳极进行复位;T2时刻,显示数据data给开关管M3的电路节点N1写数据,同时进行Vth的补偿;T3时刻,发光。
如图2所示,以8T1C LTPO像素电路为例,在补偿时和skip帧时,用DVH信号对N2节点进行复位。如图3所示,在T1时刻:DVH信号对N2、N3、N1节点进行复位;在T2时刻:Vref对N1节点进行复位;在T3时刻:Vref对N3、N2节点进行复位;在T4时刻:data进行阈值补偿;在T5时刻:固定的DVH复位,其次是对N1节点有刷一个高电位进去,M3存在一段时间的PBS;在低频时,只有SP*工作。
在AOD低频时,7T1C像素电路会由于LTPS工艺Ioff较大,10e-13A,低灰阶侦保持较差,如图4所示。对于8T1C LTPO像素电路来说,LTPO由于漏电流相比LTPS小10e-15A以下,他的帧保持相对较好,但是对于驱动管来讲,仍然需要做obs消除偏压的影响,侦保持明显变好,如图中红色线所示。
同时发现不同的N2的偏压对帧保持曲线有不同的贡献,当前的data做偏压效果最佳。在不同的亮度下,data值不一样,一般在低亮度下这种拖影以及抖屏差的现象会额外明显。但目前技术基本上都是刷新帧采用一个电压,skip帧采用一个电压,不会根据data电压来动态调整,因为dvh信号如果根据每一帧的电压来作动的话,跳动过大,ddic的功耗会提升。
如图5所示,由于开关管M3在发光时,由于受到偏压不同,有不同的Vth偏移,pTFT在受到PBS时,Vth会正漂,导致低灰阶时,Vth正漂更为严重,因此,屏幕在前一帧为黑画面,下一帧为白画面时,白色区域的亮度会不够,导致视觉上有拖影。如图6以一个具体的显示屏显示效果作为示例,在1Hz显示待机时间时,1:05向1:06切换时,由于黑切白时第一帧的亮度达不到正常的亮度,那么在第1秒内,数字6的对应的黑切白的位置出现明显的偏暗的问题。
产生上述现象的进一步原理如图7所示,黑画面时电路节点N1电位较高,Vth1较为偏正,黑切白时,由于TFT特性不能迅速转变为白画面TFT特性3。对应Vth补偿时的Vth2较正常白画面的特性曲线Vth偏正,故显示亮度会较低。当下一帧继续为白画面时,由于前1帧已经进行了1帧的白偏压,故曲线特性为特性3,故第2帧的亮度较为正常白的亮度。此现象称为TFT迟滞效应。
发明内容
本发明的目的在于提供一种OLED显示面板的驱动方法,通过在AP端增加亮度不同的画面,DDIC可以根据待显示亮度所处的亮度区间选择对应的画面,再通过PWM调光获取所需的亮度效果。
为实现上述目的,本发明提供了一种OLED显示面板的驱动方法,所述OLED显示面板包括8T1C LTPO驱动电路,所述驱动方法包括:
S1:预设N个不同亮度的显示画面,每个所述显示画面对应一个预设的亮度区间,各个所述显示画面对应不同的DVH复位电压值,N为大于1的整数;
S2:根据待显示亮度所处的亮度区间选择对应的显示画面;
S3:通过PWM调光使所述显示画面的实际显示效果为待显示亮度。
优选地,每个所述显示画面对应一第一灰阶值,所述DVH复位电压值与第一灰阶值对应的Data电压值相等。
优选地,亮度较低的所述显示画面对应的第一灰阶值不小于亮度较高的显示画面对应的第一灰阶值。
优选地,所述第一灰阶值为最高灰阶值的1/4至1/2范围内(取整数值)。
优选地,N具体为3~10范围内的整数。
与现有技术相比,本发明具有如下有益效果:通过AP端增加亮度不同的画面,DDIC可以根据待显示亮度所处的亮度区间选择对应的画面,再通过PWM调光获取所需的亮度效果。
附图说明
图1为现有技术中的7T1C驱动电路图;
图2为现有技术中的8T1C LTPO驱动电路图;
图3为现有技术中的8T1C LTPO驱动电路时序图;
图4为N2偏压对帧保持曲线影响的示意图;
图5为首帧亮度不达效果的示意图;
图6为待机显示时间画面拖影效果的示意图;
图7为TFT迟滞效应原理示意图;
图8至图9为本发明的示意图;
图中:N1/N2/N3/N4电路节点;M1/M2/M3/M4/M5/M6/M7开关管;Cst电容;S1/S2/Vref/Emit/PVDD/PVEE/Vdata电压信号端;Vth1/Vth2/Vth3。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
图8示出了本发明的主要流程:
S1:预设N个不同亮度的显示画面,每个显示画面对应不同的Data电压值,每个显示画面对应不同的DVH复位电压值,N为大于1的整数;
S2:根据待显示亮度所处的亮度区间选择对应的显示画面;
S3:通过PWM调光使显示画面的实际显示效果为待显示亮度。
作为一个示例,如图9所示,将亮度划分为band0~band4,预设5个不同亮度显示画面对应band0~band4,当AP在调整亮度从700nit调整到2nit时,在对应不同的亮度区间,发送了不同的亮度画面。当亮度调整落在700~500区间内(band0),此时对应的DBV(DisplayBrightness Value)值范围为A~B,AP会发送过来一个最大亮度为700nit的画面0,那么DDIC可以接收到当下AP要调光的DBV值,然后DDIC对当下的DBV值进行PWM调光,即根据DDIC内部寄存器设定的Emitting duty值,进行调光。需要注意的是,在band0内,亮度不同时,由于使用同为最大亮度700nit的画面0,其像素的Data电压值没有发生变化,亮度的调整都依赖于PWM调光。类似的,其余band1~4也只进行PWM调光。基于以上前提,可提前预知这五个预设的显示画面中,对应的当下的某一个灰阶的Data电压值是多少。
在相同的DBV值下,TFT响应时间和灰阶强相关,即低灰阶响应时间较差,高灰阶响应时间较好,所以在高亮度下,只需考虑较小的灰阶范围(记为0灰阶到第一灰阶值)内的data对驱动管drTFT的影响,在低亮度下,本身响应时间就较差,需要考虑较大的灰阶范围内的data对驱动管drTFT的影响。
在一个较佳的实施例中,在显示驱动面板出厂前对band0~4进行统计,band0~3画面下64灰阶作为第一灰阶值对应的Data电压值是V0、V1、V2和V3,band4亮度较低,选取较大的灰阶范围,例如以128灰阶作为第一灰阶值,当然也可以是64灰阶(这里灰阶的选取可根据实际效果进行选取),得到对应的Data电压值V4。那么对应band0~4就对应出5个不同的DVH复位电压值分别等于V0~V4,当亮度落在对应band时,DVH复位电压值选取对应的值。由于相同的band内,尽管DBV在变化,但一副画面的相同的像素Data电压值并没有变化,所以他在整个band内受到的偏压都是不变的,这样再选取对应的DVH复位电压值,可以更精准的做drTFT的恢复,这样响应时间更好。在驱动过程中存在skip帧的场合,DVH复位电压值在skip帧维持相同的值即可,也可以不一样。
对于本领域技术人员而言,显然本发明不限于上述示范性实施例的细节,而且在不背离本发明的精神或基本特征的情况下,能够以其他的具体形式实现本发明。因此,无论从哪一点来看,均应将实施例看作是示范性的,而且是非限制性的,本发明的范围由所附权利要求而不是上述说明限定,因此旨在将落在权利要求的等同要件的含义和范围内的所有变化囊括在本发明内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。
此外,应当理解,虽然本说明书按照实施方式加以描述,但并非每个实施方式仅包含一个独立的技术方案,说明书的这种叙述方式仅仅是为清楚起见,本领域技术人员应当将说明书作为一个整体,各实施例中的技术方案也可以经适当组合,形成本领域技术人员可以理解的其他实施方式。
Claims (5)
1.一种OLED显示面板的驱动方法,所述OLED显示面板包括8T1C LTPO驱动电路,其特征在于,所述驱动方法包括:
S1:预设N个不同亮度的显示画面,每个所述显示画面对应一个预设的亮度区间,各个所述显示画面对应不同的DVH复位电压值,N为大于1的整数;
S2:根据待显示亮度所处的亮度区间选择对应的显示画面;
S3:通过PWM调光使所述显示画面的实际显示效果为待显示亮度。
2.根据权利要求1所述的驱动方法,其特征在于,每个所述显示画面对应一第一灰阶值,所述DVH复位电压值与第一灰阶值对应的Data电压值相等。
3.根据权利要求2所述的驱动方法,其特征在于,亮度较低的所述显示画面对应的第一灰阶值不小于亮度较高的显示画面对应的第一灰阶值。
4.根据权利要求2所述的驱动方法,其特征在于,所述第一灰阶值为最高灰阶值的1/4至1/2范围内。
5.根据权利要求1所述的驱动方法,其特征在于,N具体为3~10范围内的整数。
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