CN102929044B - 垂直配向型液晶面板 - Google Patents
垂直配向型液晶面板 Download PDFInfo
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- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13712—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering the liquid crystal having negative dielectric anisotropy
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- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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Abstract
本发明提供一种垂直配向型液晶面板,包括:第一玻璃基板、第二玻璃基板及液晶层,该液晶层包括:负性液晶、手性剂及可光或者热聚合的聚合物,该负性液晶的液晶分子具有0°-7°的预倾角,该第一玻璃基板上形成液晶面板驱动电路,该液晶面板驱动电路包括:栅极驱动器、源极驱动器、多条选通线及多条数据线,该多条选通线和数据线界定多个像素单元,每一像素单元包括:薄膜晶体管、公共电极及像素电极,该源极驱动器通过薄膜晶体管施加于像素电极上的驱动电压为0-6V。本发明增强了液晶分子之间的弹性能,避免液晶显示器同一区域长时间显示同一图形时出现图像残留问题,同时适当提高了像素电极的驱动电压,从而保证液晶分子的响应速度。
Description
技术领域
本发明涉及液晶显示器领域,尤其涉及一种垂直配向型液晶面板。
背景技术
液晶显示器是一种显示器件,该显示器件包括设于两个相对的基板之间的液晶层,并且该显示器件利用电激励方式及液态晶体的光学各向异性来进行光切换。该液晶显示器利用液晶分子具有折射率各向异性,通过向液晶分子施加电压并由此重定向折射率各向异性的轴来控制由液晶分子透射的光的亮度。
一个液晶显示器的好坏首先要看它的面板,因为面板的好坏直接影响到画面的观看效果,并且液晶电视面板占到了整机成本的一半以上,是影响液晶电视的造价的主要因素,所以要选一款好的液晶显示器,首先要选好它的面板。
液晶层是液晶显示器的主体,不同器件所用液晶层大都是由几种以至十几种单体液晶层混合而成。液晶层一般包括:液晶分子及可光或者热聚合的聚合物单体。
在MVA液晶显示器中,在没有施加电压的情况下,液晶分子几乎完全垂直取向,但是当施加电压时促使液晶分子沿垂直排列取向膜上的多个凸起和狭缝设定的预倾方向倾斜。在具有偏振片的液晶显示中,同时还要控制该些液晶分子的倾斜方向使其与偏振片的吸收轴成45°的角度。但是作为连续介质的液晶分子可以沿他们的中间方向倾斜,不可避免的存在与设定的预倾角倾斜角度不同的液晶区域。这样的区域的存在使得液晶显示在该区域附近出现显示亮度不均匀的情况。对于这种液晶排列不均匀的情况,可以在液晶层中加入具有光或者热可聚合的成分,采用施加电压或者光照时使可聚合成分聚合,以此来限定在施加电压的情况下液晶分子的倾斜方向。
但是采用该加入光或者热聚合成分材料的技术,如果聚合不充分,可能会产生图像的残留现象。这主要是因为所聚合的聚合物的硬度不够而产生的,并且在施加电压时由于液晶分子的重新取向而产生变形。
另一方面,限定取向的可聚合物单体聚合后不具有足够的交联结构,则聚合物会变得柔软,并且恢复力减弱。在这种情况下,当将电压施加给液晶促使液晶分子倾斜并且液晶仍然保持这种状态时,即使施加的电压消失,液晶的倾斜角也不会返回到初始状态,该缺陷同样会导致图形图像的残留。
同时,液晶显示当显示相同的图形一定时间时,在显示图形部分同样会出现图像残留问题,这被认为主要是由于聚合不充分和聚合物变形导致的液晶分子的恢复力减弱;为了使聚合物单体聚合充分,必须增加光照射或者加热的时间,影响产品生产周期。
针对以上含有光或者热聚合物单体成分的液晶显示的几种导致图像残留的现象,目前主要的解决方案有以下几种,但同时也存在缺陷。
1、由于光或者热可聚合材料聚合后不具有足够的交联结构引起的图像残留,解决方案是:在施加偏转电压之前或者之后或者之前和之后或者不施加偏转电压情况下,采用多个步骤用含有不同光强或者含有不同紫外线强度或者含有不同光强和紫外线强度的光照射上述的液晶层,上述的液晶层是含有光或者热可聚合材料的液晶层。
该方法的缺陷在于:使液晶层中的光或者热可聚合材料聚合成具有较强交联结构所采用的步骤较多,并且每个步骤中对于照射光的成分和强度都有不同的要求,另外对于每个步骤之间明确的界限,步骤之间的各个参数的设置又不同,例如:步骤之间的驱动电压所加的时刻,步骤之间光强的变化或者步骤之间紫外线的强度的变化等。
2、由于光或者热可聚合材料聚合后聚合不充分导致的液晶分子的恢复力减弱导致的图像残留,解决方案是:在执行于取向控制的聚合步骤之后,对含有光或者热可聚合材料的液晶层施加一种附加紫外线照射。该附加紫外线其波长不同于用于在施加该附加紫外线之前使液晶中可聚合材料聚合的紫外线的波长。该附加紫外线的照射时不施加驱动电压,同时照射时间为10分钟或者更长的时间,其作用是使得未完全聚合的可聚合材料残余部分充分聚合。
该方法的缺陷在于:在执行混合液晶层中光或者热可聚合材料光照聚合步骤后,依然要对液晶层施加上述的附加紫外线照射使可聚合材料充分聚合,并且该附加紫外线照射的时间较长,增加了产品生产周期。
发明内容
本发明的目的在于提供一种垂直配向型液晶面板,增强液晶分子之间的弹性能,避免了应用该液晶面板的液晶显示器同一区域长时间显示同一图形时出现图像残留的问题的同时,保证应用该液晶面板的显示效果。
为实现上述目的,本发明提供一种垂直配向型液晶面板,包括:第一玻璃基板、与该第一玻璃基板相对平行设置的第二玻璃基板及液晶层,所述第一玻璃基板包括:第一基底及第一垂直型配向膜,所述第二玻璃基板包括:第二基底及第二垂直型配向膜,所述第一、第二垂直型配向膜设于第一、第二基底之间,所述液晶层设于第一、第二垂直型配向膜之间,所述液晶层包括:负性液晶、手性剂及可光或者热聚合的聚合物,所述负性液晶包括数个液晶分子,所述液晶分子具有0°-7°的预倾角,所述第一玻璃基板上形成液晶面板驱动电路,所述液晶面板驱动电路包括:栅极驱动器、源极驱动器、多条选通线及多条数据线,该多条选通线和数据线界定多个像素单元,每一像素单元包括一薄膜晶体管、一公共电极及一与薄膜晶体管电性连接的像素电极,所述薄膜晶体管通过选通线及数据线分别与栅极驱动器及源极驱动器电性连接,所述公共电极与像素电极形成一液晶电容,所述源极驱动器通过薄膜晶体管施加于像素电极上的驱动电压为0-6V。
所述手性剂在液晶层中添加比例为C=1/(HTP*P),其中,C为手性剂的质量百分比浓度,P为液晶分子的螺距,HTP为手性剂诱导液晶分子旋转能力,即扭转力。
所述手性剂在液晶层中添加的质量百分比浓度为0.5%至5%。
所述可光或者热聚合的聚合物在液晶层中添加的质量百分比浓度为0.1%-5%。
所述可光或者热聚合的聚合物由可光或者热聚合的聚合物单体在紫外线或含有紫外线的光照射下形成。
所述薄膜晶体管包括:一源极、一栅极及一漏极,该源极通过数据线电性连接至源极驱动器,所述栅极通过选通线电性连接至栅极驱动器,所述漏极与像素电极电性连接。
所述液晶分子结构式为
所述手性剂为手性剂S811、手性剂R811、手性剂S1011、手性剂R1011或含氟手性剂。
本发明垂直配向型液晶面板还包括一存储电容,所述存储电容与所述液晶电容并联连接。
本发明的有益效果:本发明垂直配向型液晶面板通过在液晶层中加入手性剂,增强了液晶分子之间的弹性能,避免了应用该垂直配向型液晶面板的液晶显示器同一区域长时间显示同一图形时出现图像残留问题,同时适当提高了像素电极的驱动电压,保证液晶分子的响应速度。
为了能更进一步了解本发明的特征以及技术内容,请参阅以下有关本发明的详细说明与附图,然而附图仅提供参考与说明用,并非用来对本发明加以限制。
附图说明
下面结合附图,通过对本发明的具体实施方式详细描述,将使本发明的技术方案及其它有益效果显而易见。
附图中,
图1为本发明垂直配向型液晶面板中驱动电路的结构示意图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果,以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图1,本发明提供一种垂直配向型液晶面板,包括:第一玻璃基板、与第一玻璃基板相对平行设置的第二玻璃基板及设于第一玻璃基板与第二玻璃基板之间的液晶层(均未图示),所述第一玻璃基板包括:第一基底及第一垂直型配向膜,所述第二玻璃基板包括:第二基底及第二垂直型配向膜,所述第一、第二垂直型配向膜设于第一、第二基底之间,所述液晶层设于第一、第二垂直型配向膜之间。所述液晶层中包括有负性液晶,所述负性液晶包括数个液晶分子,由于第一、第二垂直配向膜的作用,所述液晶分子在未被施加电压时,都垂直于该第一、第二玻璃基板。
所述第一玻璃基板上形成液晶面板驱动电路,所述液晶面板驱动电路包括:栅极驱动器2、源极驱动器4、多条选通线S(i)及多条数据线G(j),该多条选通线S(i)和数据线G(j)界定多个像素单元,每一像素单元包括一薄膜晶体管T(i,j)、一公共电极8、一与薄膜晶体管T(i,j)电性连接的像素电极6及一存储电容Cs,所述薄膜晶体管T(i,j)通过选通线S(i)及数据线G(j)分别与栅极驱动器2及源极驱动器4电性连接,所述公共电极8与像素电极6形成一液晶电容C1c,所述存储电容Cs与该液晶电容C1c并联连接,随着存储电容Cs的充放电对像素电极6进行电压补偿,可以提高像素电极6驱动的精确度。
所述薄膜晶体管T(i,j)包括:一源极S、一栅极G及一漏极D,该源极S通过数据线S(i)电性连接至源极驱动器4,所述栅极G通过选通线G(j)电性连接至栅极驱动器2,所述漏极D与像素电极6电性连接。通过施加于栅极G上的电压来控制具有该薄膜晶体管T(i,j)的像素单元的写操作,从而驱动液晶分子的旋转,完成图形的显示。图1中电容Cgd为薄膜晶体管T(i,j)的漏极D与栅极G因结构特性产生的寄生电容。
所述液晶层还包括:手性剂及可光或者热聚合的聚合物。其中,所述可光或者热聚合的聚合物由可光或者热聚合的聚合物单体在紫外线或含有紫外线的光照射下形成,所述可光或者热聚合的聚合物在液晶层中添加的质量百分比浓度为0.1%-5%;所述手性剂在液晶层中添加比例参考公式C=1/(HTP*P)确定,C为手性剂的质量百分比浓度,P为液晶分子的螺距,HTP为手性剂诱导液晶分子旋转能力,即扭转力。在本较佳实施例中,所述手性剂在液晶层中添加的质量百分比浓度为0.5%至5%。且,所述手性剂可以为手性剂S811、手性剂R811、手性剂S1011、手性剂R1011或含氟手性剂等。
所述液晶分子具有0°-7°的预倾角,可以保证所有的液晶分子在加电压的情况下,朝相同的方向旋转,而且还可以提高显示品质,缩短液晶分子响应时间。该预倾角的大小根据液晶材料及取向剂材料设定。所述液晶分子结构式具体可为: 等。
在所述液晶层加入手性剂后,可以改变液晶分子的主螺旋距,进而可以提高液晶分子之间的弹性能,也就是说液晶层中加入手性剂能够增加液晶层的粘度,液晶层的粘度的公式为η=Td/(k*d2),其中Td为显示器的响应时间,k与与弹性系数有关、d为两片基板中容置的液晶层的厚度,从上述公式上可以看出,手性剂对粘度的改变同时也会带来液晶分子弹性系数的改变,从而全面改变液晶分子之间的弹性能,避免液晶分子长时间在同一区域显示同一图形时,出现图像残留现象,同时适当提高像素电极6上的驱动电压,满足液晶分子偏转所需的电场能,进而增强液晶分子的旋转力,保证响应时间。在本较佳实施例中,所述源极驱动器4通过薄膜晶体管T(i,j)施加于像素电极6上的驱动电压优选为0-6V,该驱动电压范围根据所手性剂的添加比例进行适当调整。
在液晶层中添加手性剂,增加液晶分子之间的弹性能,可以使得即便可光或者热聚合的聚合物单体不能充分聚合,不能提供强的交联结构的情况下,长时间显示同样的画面,液晶分子长时间旋转在相同的旋转角度上,依然能通过自身的较强弹性能恢复到初始状态,从而避免图像残留现象。
综上所述,本发明提供一种垂直配向型液晶面板,通过在液晶层中加入手性剂,增强了液晶分子之间的弹性能,避免了应用该液晶面板的液晶显示器同一区域长时间显示同一图形时出现图像残留问题,同时适当提高了像素电极的驱动电压,保证液晶分子的响应速度。
以上所述,对于本领域的普通技术人员来说,可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形,而所有这些改变和变形都应属于本发明权利要求的保护范围。
Claims (4)
1.一种垂直配向型液晶面板,其特征在于,包括:第一玻璃基板、与该第一玻璃基板相对平行设置的第二玻璃基板及液晶层,所述第一玻璃基板包括:第一基底及第一垂直型配向膜,所述第二玻璃基板包括:第二基底及第二垂直型配向膜,所述第一、第二垂直型配向膜设于第一、第二基底之间,所述液晶层设于第一、第二垂直型配向膜之间,所述液晶层包括:负性液晶、手性剂及可光或者热聚合的聚合物,所述负性液晶包括数个液晶分子,所述液晶分子具有0°-7°的预倾角,所述第一玻璃基板上形成液晶面板驱动电路,所述液晶面板驱动电路包括:栅极驱动器、源极驱动器、多条选通线及多条数据线,该多条选通线和数据线界定多个像素单元,每一像素单元包括一薄膜晶体管、一公共电极及一与薄膜晶体管电性连接的像素电极,所述薄膜晶体管通过选通线及数据线分别与栅极驱动器及源极驱动器电性连接,所述公共电极与像素电极形成一液晶电容,所述源极驱动器通过薄膜晶体管施加于像素电极上的驱动电压为6V;
所述手性剂为手性剂S811、手性剂R811、手性剂S1011、手性剂R1011或含氟手性剂;
所述垂直配向型液晶面板还包括一存储电容,所述存储电容与所述液晶电容并联连接;
所述手性剂在液晶层中添加比例为C=1/(HTP*P),其中,C为手性剂的质量百分比浓度,P为液晶分子的螺距,HTP为手性剂诱导液晶分子旋转能力,即扭转力;
所述手性剂在液晶层中添加的质量百分比浓度为0.5%至5%;
所述可光或者热聚合的聚合物在液晶层中添加的质量百分比浓度为0.1%-5%。
2.如权利要求1所述的垂直配向型液晶面板,其特征在于,所述可光或者热聚合的聚合物由可光或者热聚合的聚合物单体在紫外线或含有紫外线的光照射下形成。
3.如权利要求1所述的垂直配向型液晶面板,其特征在于,所述薄膜晶体管包括:一源极、一栅极及一漏极,该源极通过数据线电性连接至源极驱动器,所述栅极通过选通线电性连接至栅极驱动器,所述漏极与像素电极电性连接。
4.如权利要求1所述的垂直配向型液晶面板,其特征在于,所述液晶分子结构式为
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