CN113270059A - 伽马电压生成设备 - Google Patents

伽马电压生成设备 Download PDF

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CN113270059A
CN113270059A CN202110170580.9A CN202110170580A CN113270059A CN 113270059 A CN113270059 A CN 113270059A CN 202110170580 A CN202110170580 A CN 202110170580A CN 113270059 A CN113270059 A CN 113270059A
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reference voltage
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circuit
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李东洙
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LX Semicon Co Ltd
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Silicon Works Co Ltd
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Abstract

本公开提供了伽马电压生成设备。本公开使得能够通过根据依据像素电力电压的电平而可变的伽马基准电压来生成或选择性地使用伽马电压，来去除不稳定像素电力电压的影响。

Description

伽马电压生成设备
技术领域
本公开涉及一种生成用于驱动显示设备中的像素的伽马电压的技术。
背景技术
显示设备可以包括面板、栅极驱动设备、数据驱动设备和定时控制器。数据驱动设备可以从数据处理设备接收图像数据，将图像数据转换成模拟信号(例如数据电压)，并将其发送到面板。
数据驱动设备可以包括数模转换器(DAC)，数模转换器将图像数据转换成模拟信号。数模转换器可以根据图像数据输出多个伽马电压中的一个作为模拟信号。多个伽马电压可以分别具有彼此不同的固定电平。
可以为面板中包括的多个像素提供电力以进行驱动。然而，电源线中的电阻可能降低向像素供给的电压的电平。由于该原因，可能无法为每个像素提供均匀的电力，因此每个像素可能不会发射期望亮度的光。结果，每个像素的亮度可能彼此不同。
分别具有固定电平的多个伽马电压可能不会有助于减小由于线路中的电阻而导致的像素之间的亮度差异。在向像素供给的电力变化的情况下，如果多个伽马电压或用于生成多个伽马电压的伽马基准电压具有固定电平以补偿可变电力，则像素可能不会被目标电平的模拟电压驱动，并且可能不会以目标亮度发光。
另外，就图像质量而言，对像素的不稳定供电可能导致闪烁或波噪声，并且可能加剧像素的劣化。此外，电力电平的频繁波动可能会增加电力消耗。
因此，本公开在于提供一种用于生成校正的伽马电压以解决用于驱动像素的电压的不稳定性的技术。
发明内容
在此背景下，本公开的一方面在于提供一种用于选择性地供给固定电平的伽马电压或依据像素电力电压的电平而可变的伽马电压的技术。
本公开的另一方面在于提供一种用于接收像素电力电压、依据像素电力电压的电平生成伽马基准电压、并根据伽马基准电压生成依据像素电力电压的电平的多个伽马电压的技术。
为此，在一方面中，本公开提供了一种伽马电压生成设备，用于生成用于驱动像素的伽马电压，所述伽马电压生成设备包括：第一电压生成电路，用于生成第一伽马基准电压；第二电压生成电路，用于生成第二伽马基准电压，其中，所述第二伽马基准电压的电平是根据供给至像素的像素电力电压的电平来调整的；以及伽马电压生成电路，用于根据在所述第一伽马基准电压或所述第二伽马基准电压之中选择的伽马基准电压，来生成伽马电压。
所述第一伽马基准电压可以被调节为固定电平。
所述伽马电压生成电路可以接收最高电平的电压和最低电平的电压，并通过分配所述最高电平的电压与所述最低电平的电压之间的电压来生成伽马电压。所述第一伽马基准电压可以是所述最高电平的电压或所述最低电平的电压。
所述像素可以包括彼此串联连接的有机发光二极管和驱动晶体管，所述像素电力电压可以向所述有机发光二极管供电，并且可以通过所述驱动晶体管的栅极节点供给根据所述像素的灰度值而从所述伽马电压中所选择的伽马电压。
可以通过所述驱动晶体管的源极节点供给所述像素电力电压。
在另一方面中，本公开提供了一种伽马电压生成设备，用于生成用于驱动像素的伽马电压，所述伽马电压生成设备包括：电压生成电路，用于生成第一伽马基准电压和第二伽马基准电压，所述第一伽马基准电压和所述第二伽马基准电压的电平是根据供给至像素的像素电力电压的电平来调整的；以及伽马电压生成电路，用于接收作为最高电平的电压的所述第一伽马基准电压和作为最低电平的电压的所述第二伽马基准电压，并通过分配所述最高电平的电压与所述最低电平的电压之间的电压来生成伽马电压。
所述电压生成电路可以接收一个基准电压并将所述像素电力电压反映在所述一个基准电压中，以生成所述第一伽马基准电压或所述第二伽马基准电压。
所述电压生成电路可以通过对所述一个基准电压与所述像素电力电压求和，来生成所述第一伽马基准电压。
所述电压生成电路可以包括用于生成所述第一伽马基准电压的第一伽马基准电压电路，并且所述第一伽马基准电压电路可以包括用于通过输入端子接收所述一个基准电压和所述像素电力电压的第一放大器。
所述电压生成电路可以接收另一基准电压并通过获得所述另一基准电压与所述像素电力电压之间的差，来生成所述第二伽马基准电压。
所述电压生成电路可以包括用于生成所述第二伽马基准电压的第二伽马基准电压电路，并且所述第二伽马基准电压电路可以包括用于通过输入端子接收所述另一基准电压并通过另一输入端子接收所述像素电力电压的第二放大器。
所述第二伽马基准电压电路可以包括差分放大器。
所述电压生成电路可以包括用于生成所述第一伽马基准电压的第一伽马基准电压电路，并且所述第一伽马基准电压电路可以包括非反相加法电路，所述非反相加法电路包括第一放大器和四个电阻。
所述电压生成电路可以包括用于生成所述第二伽马基准电压的第二伽马基准电压电路，并且所述第二伽马基准电压电路可以包括差分放大电路，所述差分放大电路包括第二放大器和四个电阻。
所述像素可以包括彼此串联连接的有机发光二极管和驱动晶体管，所述像素电力电压可以向所述有机发光二极管供电，并且可以通过所述驱动晶体管的栅极节点供给根据所述像素的灰度值而从所述伽马电压中所选择的伽马电压。
如上所述，本公开使得能够通过根据依据像素电力电压而可变的伽马基准电压来生成或选择性地使用伽马电压，来去除不稳定像素电力电压的影响。
另外，由于去除了不稳定像素电力电压的影响，因此本公开使得能够降低闪烁、波噪声以及像素劣化的概率，并由此提高图像质量。
附图说明
通过以下结合附图的详细描述，本公开的以上和其他方面、特征和优点将更加清楚，其中：
图1是根据实施例的显示设备的结构图；
图2是示出像素的结构以及输入到像素或从像素输出的信号的电路图；
图3是数据驱动设备的伽马电压生成设备的结构图；
图4是伽马电压生成设备的伽马电压生成电路的电路图；
图5是根据实施例的数据驱动设备的伽马电压生成设备的结构图；
图6是根据实施例的第一电压校正电路的结构图；并且
图7是根据实施例的第二电压校正电路的结构图。
具体实施方式
图1是根据实施例的显示设备的结构图。
参照图1，显示设备100可以包括面板110、数据驱动设备120、栅极驱动设备130和数据处理设备140。
在面板110上，可以布置多条数据线DL和多条栅极线GL，并且还可以布置多个像素P。像素P可以包括多个子像素。在此，子像素可以是红(R)子像素、绿(G)子像素、蓝(B)子像素或白(W)子像素。像素可以包括RGB子像素、RGBG子像素或RGBW子像素。在下文中，为了便于描述，将在假设像素P包括RGB子像素并且将各种信号发送到像素P而不区分子像素的情况下进行描述。
数据驱动设备120、栅极驱动设备130和数据处理设备140将生成用于在面板110上显示图像的信号。
栅极驱动设备130可以通过栅极线GL供给栅极驱动信号，诸如接通电压或断开电压等。当向像素P供给接通电压的栅极驱动信号时，像素P与数据线DL连接。当向像素P供给断开电压的栅极驱动信号时，像素P从数据线DL断开。栅极驱动设备130可以被称为栅极驱动器。
数据驱动设备120可以通过数据线DL向像素P供给数据电压Vdata。可以根据栅极驱动信号，向像素P供给通过数据线DL供给的数据电压Vdata。数据驱动设备120可以被称为源极驱动器。
数据驱动设备120可以生成多个伽马电压并选择多个伽马电压中的一个以输出与图像数据RGB相对应的数据电压Vdata。数据驱动设备120可以包括数模转换器和缓冲器。数模转换器可以根据图像数据RGB选择多个伽马电压中的一个，并将所选择的一个电压输出到缓冲器。缓冲器可以放大所选择的一个电压，并且通过数据线DL将该电压作为数据电压Vdata施加到像素P。
数据驱动设备120可以包括至少一个集成电路，并且该至少一个集成电路可以根据情况以带式自动接合(TAB)型或玻璃覆晶(COG)型连接到显示面板110的接合垫、直接形成在显示面板110上，或者集成在显示面板110上。另外，数据驱动设备120可以以覆晶薄膜(COF)型形成。
数据处理设备140可以向栅极驱动设备130和数据驱动设备120供给控制信号。例如，数据处理设备140可以向栅极驱动设备130发送用于启动扫描的栅极控制信号GCS，将图像数据输出到数据驱动设备120，并发送数据控制信号DCS以控制数据驱动设备120向每个像素P供给数据电压Vdata。数据处理设备140可以被称为定时控制器。
电力管理设备150可以向面板110、数据驱动设备120、栅极驱动设备130和数据处理设备140供电。电力管理设备150可以生成电压，每个电压具有每个电路(例如DC-DC转换器等)所要求的电平。
电力管理设备150可以向面板110的像素供给像素电力电压ELVDD和ELVSS，以驱动像素P。像素电力电压ELVDD和ELVSS可以包括第一像素电力电压ELVDD和第二像素电力电压ELVSS，第二像素电力电压ELVSS的电平低于第一像素电力电压ELVDD的电平。
第一像素电力电压ELVDD也可以被发送到数据驱动设备120。通过电力线PL来供给像素电力电压ELVDD和ELVSS。当像素P远离电力管理设备150时，电力线PL中的电阻会增大。电力线PL中的电阻的增大会减小供给到像素P的像素电力电压ELVDD和ELVSS的电平。随着像素P与电力管理设备150之间的距离的增大，电压电平的减小可能更大。特别地，第一像素电力电压ELVDD可能受到电力线PL中的电阻的影响。因此，数据驱动设备120可以从像素接收第一像素电力电压ELVDD并生成校正的伽马电压，以便去除由于电力线PL中的电阻而导致的第一像素电力电压ELVDD的电平减小的影响。
图2是示出像素的结构以及输入到像素或从像素输出的信号的电路图。
参照图2，像素P可以包括有机发光二极管OLED、驱动晶体管DRT、开关晶体管SWT和存储电容器Cstg。当向像素P供给像素电力电压ELVDD和ELVSS时，可以在有机发光二极管的阳极电极方向上供给第一像素电力电压ELVDD，并且可以在有机发光二极管的阴极电极方向上供给第二像素电力电压ELVSS。
有机发光二极管可以包括阳极电极、有机层和阴极电极。根据驱动晶体管DRT的控制，有机发光二极管可以通过将阳极电极与第一像素电力电压ELVDD连接并且将阴极电极与基极电压(即第二像素电力电压ELVSS)连接来发光。
驱动晶体管DRT可以通过控制向有机发光二极管供给的驱动电流Ioled的电平来控制有机发光二极管的亮度。由于像素电力电压ELVDD和ELVSS具有拥有均匀脉冲的周期波，因此驱动电流Ioled也可以具有周期波。
驱动晶体管DRT的第一节点N1可以与有机发光二极管的阳极电极电性连接，并且可以是源极节点或漏极节点。驱动晶体管DRT的第二节点N2可以与开关晶体管SWT的源极节点或漏极节点电性连接，并且可以是栅极节点。驱动晶体管DRT的第三节点N3可以与电力线PL电性连接，并且可以是漏极节点或源极节点，其中，通过所述电力线PL供给第一像素电力电压ELVDD。
开关晶体管SWT可以电性连接在数据线DL与驱动晶体管DRT的第二节点N2之间，并且可以由通过栅极线GL供给的扫描信号而接通。
当开关晶体管SWT接通时，通过数据线DL从数据驱动电路120供给的数据电压Vdata可以被发送到驱动晶体管DRT的第二节点N2。
存储电容器Cstg可以电性连接在驱动晶体管DRT的第二节点N2与第三节点N3之间。
存储电容器Cstg可以是存在于驱动晶体管DRT的第二节点N2与第三节点N3之间的寄生电容器，或是有意布置在驱动晶体管DRT外部的外部电容器。
图3是数据驱动设备的伽马电压生成设备的结构图。
参照图3，伽马电压生成设备1可以包括电压生成电路10和伽马电压生成电路20。
电压生成电路10可以生成用于生成伽马电压Vg1-Vgn的至少两个伽马基准电压(即，最高电平的电压Vtop和最低电平的电压Vbot)，并将所述至少两个伽马基准电压发送至伽马电压生成电路20。这里，最高电平的电压可以具有比最低电平的电压的电平更高的电平，并且最高电平的电压和最低电平的电压可以分别被调节为固定电平。
伽马电压生成电路20可以生成伽马电压Vg1-Vgn。伽马电压生成电路20可以接收最高电平的电压Vtop和最低电平的电压Vbot，并通过分配最高电平的电压Vtop与最低电平的电压Vbot之间的电压来生成伽马电压Vg1-Vgn。伽马电压生成电路20可以包括电阻器串，多个电阻在电阻器串中彼此串联连接。电阻器串可以分配最高电平的电压Vtop与最低电平的电压Vbot之间的电压。电阻器串可以被称为分压器。构成电阻器串的多个电阻在电阻彼此连接的点处形成节点，并且可以在节点处分别形成伽马电压Vg1-Vgn。由于在连接两个相邻电阻的每个点处都形成节点，因此可以生成多个伽马电压Vg1-Vgn。
数据驱动设备可以选择多个伽马电压Vg1-Vgn中的一个伽马电压，放大所选择的一个伽马电压，并将其作为数据电压输出。
图4是伽马电压生成设备的伽马电压生成电路的电路图。
参照图4，作为示例，伽马电压生成电路20可以包括用于生成16个伽马电压Vg1-Vg16的电阻器串。
伽马电压生成电路20可以包括电阻器串21。电阻器串21可以包括彼此串联连接的多个电阻。电阻器串21还可以包括通过两端之间的多个电阻的连接而形成的节点。这些节点可以包括连接电阻的点、电阻串的施加了最高电平的电压的一端、以及电阻串的施加了最低电平的电压的另一端。在该图中，用R表示伽马电压生成电路20中包括的电阻。
在电阻串21中，最高电平的电压Vtop与最低电平的电压Vbot之间的电压可以由串联的多个电阻来分配，使得可以在各个节点中形成节点电压。在16个节点中形成的节点电压V1-V16可以被输出为16个伽马电压Vg1-Vg16。
图5是根据实施例的数据驱动设备的伽马电压生成设备的结构图。
参照图5，根据实施例的伽马电压生成设备500可以包括第一电压生成电路510、第二电压生成电路520、选择电路530和伽马电压生成电路540。
伽马电压生成设备500可以生成用于驱动像素的伽马电压。伽马电压生成设备500可以使用被调节为与像素电力电压ELVDD和ELVSS的电平无关的固定电平的第一伽马基准电压Vgref11和Vgref12、或者使用具有依据像素电力电压ELVDD和ELVSS的电平而可变的电平的第二伽马基准电压Vgref21和Vgref22，来生成伽马电压Vg1-Vgn。换句话说，伽马电压生成设备500可以选择性地使用第一伽马基准电压Vgref11和Vgref12或第二伽马基准电压Vgref21和Vgref22来生成伽马电压Vg1-Vgn。
在该图中，将描述如下示例，在该示例中，伽马电压生成设备500生成与第一像素电力电压ELVDD相关联的第二伽马基准电压Vgref21和Vgref22。
第一电压生成电路510可以生成被调节为固定电平的第一伽马基准电压Vgref11和Vgref12。第一伽马基准电压Vgref11和Vgref12可以包括第1-1伽马基准电压Vgref11和第1-2伽马基准电压Vgref12。当选择电路530选择第一伽马基准电压Vgref11和Vgref12时，第1-1伽马基准电压Vgref11可作为最高电平的电压Vtop而被输入到伽马电压生成电路540中，并且第1-2伽马基准电压Vgref12可作为最低电平的电压Vbot而被输入到伽马电压生成电路540中。
第二电压生成电路520可以生成依据第一像素电力电压ELVDD的电平而具有不同电平的第二伽马基准电压Vgref21和Vgref22。第二伽马基准电压Vgref21和Vgref22可以包括第2-1伽马基准电压Vgref21和第2-2伽马基准电压Vgref22。当选择电路530选择第二伽马基准电压Vgref21和Vgref22时，第2-1伽马基准电压Vgref21可作为最高电平的电压Vtop而被输入到伽马电压生成电路540中，并且第2-2伽马基准电压Vgref22可作为最低电平的电压Vbot而被输入到伽马电压生成电路540中。
为了生成依据第一像素电力电压ELVDD的电平可变的第二伽马基准电压Vgref21和Vgref22，第二电压生成电路520可以反映第一像素电力电压ELVDD。
具体地，第二电压生成电路520可以接收第一基准电压Vref1或第二基准电压Vref2，并通过将第一像素电力电压ELVDD反映在接收到的基准电压Vref1和Vref2中，来生成第2-1伽马基准电压Vgref21或第2-2伽马基准电压Vgref22。
第二电压生成电路520可以通过将第一像素电力电压ELVDD与第一基准电压Vref1相加来生成第2-1伽马基准电压Vgref21。第二电压生成电路520可以包括第一伽马基准电压电路，以生成第2-1伽马基准电压Vgref21。第一伽马基准电压电路可以包括放大器，该放大器通过输入端子接收第一基准电压Vref1和第一像素电力电压ELVDD。
另外，第二电压生成电路520可以通过获得第二基准电压Vref2与第一像素电力电压ELVDD之间的差来生成第2-2伽马基准电压Vgref22。第二电压生成电路520可以包括第二伽马基准电压电路，以生成第2-2伽马基准电压Vgref22。第二伽马基准电压电路可以包括放大器，该放大器通过一个输入端子接收第二基准电压Vref2，并且通过另一输入端子接收第一像素电力电压ELVDD。在此，第二伽马基准电压电路中包括的放大器可以是差分放大器。
第二电压生成电路520可以包括第一电压校正电路521和第二电压校正电路522，以分别生成第2-1伽马基准电压Vgref21和第2-2伽马基准电压Vgref22。
第一电压校正电路521可以接收第一像素电力电压ELVDD，并生成依据第一像素电力电压ELVDD的电平而可变的第2-1伽马基准电压Vgref21。因此，第一电压校正电路521可以是第一伽马基准电压电路。由于第一电压校正电路521可以生成反映第一像素电力电压ELVDD的第2-1伽马基准电压Vgref21，因此，第2-1伽马基准电压Vgref21可以随着第一像素电力电压ELVDD由于电力线中的电阻导致的变化而变化。第2-1伽马基准电压Vgref21可以作为最高电平的电压Vtop而被输入到伽马电压生成电路540中。
第二电压校正电路522可以接收第一像素电力电压ELVDD，并生成依据第一像素电力电压ELVDD的电平而可变的第2-2伽马基准电压Vgref22。因此，第二电压校正电路522可以是第二伽马基准电压电路。由于第二电压校正电路522可以生成反映第一像素电力电压ELVDD的第2-2伽马基准电压Vgref22，因此，第2-2伽马基准电压Vgref22可以随着第一像素电力电压ELVDD由于电力线中的电阻导致的变化而变化。第2-2伽马基准电压Vgref22可以作为最低电平的电压Vbot而被输入到伽马电压生成电路540中。
选择电路530可以选择第一伽马基准电压Vgref11、Vgref12和第二伽马基准电压Vgref21、Vgref22中的一组。选择电路530可以将所选择的伽马基准电压作为最高电平的电压Vtop和最低电平的电压Vbot发送至伽马电压生成电路540。
伽马电压生成电路540可以接收由选择电路530选择为最高电平的电压Vtop和最低电平的电压Vbot的伽马基准电压，并生成多个伽马电压Vg1-Vgn。伽马电压生成电路540可以通过分配所选择的伽马基准电压之间的电压来生成分别具有不同电平的多个伽马电压。
例如，伽马电压生成电路540可以通过分配第1-1伽马基准电压Vgref11与第1-2伽马基准电压Vgref12之间的电压、或者通过分配第2-1伽马基准电压Vgref21与第2-2伽马基准电压Vgref22之间的电压，来生成多个伽马电压Vg1-Vgn。
根据本公开的实施例，当第一像素电力电压ELVDD的电平变化时，第二电压生成电路520生成在接收到第一像素电力电压ELVDD之后根据第一像素电压ELVDD的电平的变化立即校正的伽马基准电压Vgref21和Vgref22。由于像素电力电压的电平的变化被实时反映，因此可以更精确地校正伽马基准电压。
此外，由于根据依据像素电力电压的电平而可变的伽马基准电压来生成或选择性地使用伽马电压，因此可以去除不稳定像素电力电压的影响，并且这使得能够降低闪烁、波噪声以及像素劣化的概率，并由此提高图像质量。
图6是根据实施例的第一电压校正电路的结构图。
参照图6，第一电压校正电路521可以包括第一放大器OP1和四个电阻Ra1-Ra4。
第一放大器OP1和四个电阻Ra1-Ra4可以形成非反相加法电路。
第一电阻Ra1可以通过其一侧而被提供第一基准电压Vref1，并且可以在其另一侧与第一放大器OP1的第一输入端子Na1连接。
第二电阻Ra2可以通过其一侧而被提供第一像素电力电压ELVDD，并且可以在其另一侧与第一放大器OP1的第一输入端子Na1连接。
第三电阻Ra3可以在其一侧与第一放大器OP1的输出端子Nao连接，并且可以在其另一侧与第一放大器OP1的第二输入端子Na2连接。
第四电阻Ra4可以在其一侧与第一放大器OP1的第二输入端子Na2连接并且在其另一侧与地连接。
四个电阻Ra1-Ra4可以具有相同的阻抗值。
在这种情况下，可以在第一输入端子Na1中形成电压(Vref1+ELVDD)/2，并且可以在输出端子Nao中形成电压Vref1+ELVDD。
根据这种关系，第2-1伽马基准电压Vgref21可以等于第一基准电压Vref1和第一像素电力电压ELVDD之和。
图7是根据实施例的第二电压校正电路的结构图。
参照图7，第二电压校正电路522可以包括第二放大器OP2和四个电阻Rb1-Rb4。
第二放大器OP2和四个电阻Rb1-Rb4可以形成差分放大电路。
第一电阻Rb1可以通过其一侧而被提供第二基准电压Vref2，并且可以在其另一侧与第二放大器OP2的第一输入端子Nb1连接。
第二电阻Rb2可以通过其一侧而被提供第一像素电力电压ELVDD，并且可以在其另一侧与第二放大器OP2的第二输入端子Nb2连接。
第三电阻Rb3可以在其一侧与第二放大器OP2的输出端子Nbo连接，并且可以在其另一侧与第二放大器OP2的第一输入端子Nb1连接。
第四电阻Rb4可以在其一侧与第二放大器OP2的第二输入端子Nb2连接，并且在其另一侧与地连接。
四个电阻Rb1-Rb4可以具有相同的阻抗值。
在这种情况下，可以在输出端子Nbo中形成通过从像素电力电压ELVDD中减去第二基准电压Vref2而获得的电压。
相关申请的交叉引用
本申请要求2020年2月14日提交的韩国专利申请第10-2020-0018485号的优先权，该申请的全部内容通过引用并入本文。

Claims (15)

1.一种伽马电压生成设备，用于生成用于驱动像素的伽马电压，所述伽马电压生成设备包括：
第一电压生成电路，用于生成第一伽马基准电压；
第二电压生成电路，用于生成第二伽马基准电压，其中，所述第二伽马基准电压的电平是根据供给至像素的像素电力电压的电平来调整的；以及
伽马电压生成电路，用于根据在所述第一伽马基准电压与所述第二伽马基准电压之间选择的伽马基准电压，来生成所述伽马电压。
2.根据权利要求1所述的伽马电压生成设备，其中，所述第一伽马基准电压被调节为固定电平。
3.根据权利要求2所述的伽马电压生成设备，其中，所述伽马电压生成电路接收最高电平的电压和最低电平的电压，并通过分配所述最高电平的电压与所述最低电平的电压之间的电压来生成所述伽马电压，以及所述第一伽马基准电压是所述最高电平的电压和所述最低电平的电压中的一个。
4.根据权利要求1所述的伽马电压生成设备，其中，所述像素包括彼此串联连接的有机发光二极管和驱动晶体管，所述像素电力电压向所述有机发光二极管供电，并且向所述驱动晶体管的栅极节点供给根据所述像素的灰度值而从所述伽马电压中所选择的伽马电压。
5.根据权利要求4所述的伽马电压生成设备，其中，向所述驱动晶体管的源极节点供给所述像素电力电压。
6.一种伽马电压生成设备，用于生成用于驱动像素的伽马电压，所述伽马电压生成设备包括：
电压生成电路，用于生成第一伽马基准电压和第二伽马基准电压，其中，所述第一伽马基准电压和所述第二伽马基准电压的电平是根据供给至像素的像素电力电压的电平来调整的；以及
伽马电压生成电路，用于接收作为最高电平的电压的所述第一伽马基准电压和作为最低电平的电压的所述第二伽马基准电压，并通过分配所述最高电平的电压与所述最低电平的电压之间的电压来生成所述伽马电压。
7.根据权利要求6所述的伽马电压生成设备，其中，所述电压生成电路接收一个基准电压并将所述像素电力电压反映在所述一个基准电压中，以生成所述第一伽马基准电压或所述第二伽马基准电压。
8.根据权利要求7所述的伽马电压生成设备，其中，所述电压生成电路通过对所述一个基准电压与所述像素电力电压求和，来生成所述第一伽马基准电压。
9.根据权利要求8所述的伽马电压生成设备，其中，所述电压生成电路包括用于生成所述第一伽马基准电压的第一伽马基准电压电路，并且所述第一伽马基准电压电路包括用于通过输入端子接收所述一个基准电压和所述像素电力电压的第一放大器。
10.根据权利要求7所述的伽马电压生成设备，其中，所述电压生成电路接收另一基准电压，并通过获得所述另一基准电压与所述像素电力电压之间的差来生成所述第二伽马基准电压。
11.根据权利要求10所述的伽马电压生成设备，其中，所述电压生成电路包括用于生成所述第二伽马基准电压的第二伽马基准电压电路，并且所述第二伽马基准电压电路包括用于通过输入端子接收所述另一基准电压并通过另一输入端子接收所述像素电力电压的第二放大器。
12.根据权利要求11所述的伽马电压生成设备，其中，所述第二伽马基准电压电路包括差分放大器。
13.根据权利要求8所述的伽马电压生成设备，其中，所述电压生成电路包括用于生成所述第一伽马基准电压的第一伽马基准电压电路，并且所述第一伽马基准电压电路包括非反相加法电路，所述非反相加法电路包括第一放大器和四个电阻。
14.根据权利要求10所述的伽马电压生成设备，其中，所述电压生成电路包括用于生成所述第二伽马基准电压的第二伽马基准电压电路，并且所述第二伽马基准电压电路包括差分放大电路，所述差分放大电路包括第二放大器和四个电阻。
15.根据权利要求6所述的伽马电压生成设备，其中，所述像素包括彼此串联连接的有机发光二极管和驱动晶体管，所述像素电力电压向所述有机发光二极管供电，并且通过所述驱动晶体管的栅极节点供给根据所述像素的灰度值而从所述伽马电压中选择的伽马电压。
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