WO2013185425A1 - 像素结构、显示装置及过压驱动方法 - Google Patents
像素结构、显示装置及过压驱动方法 Download PDFInfo
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- WO2013185425A1 WO2013185425A1 PCT/CN2012/083156 CN2012083156W WO2013185425A1 WO 2013185425 A1 WO2013185425 A1 WO 2013185425A1 CN 2012083156 W CN2012083156 W CN 2012083156W WO 2013185425 A1 WO2013185425 A1 WO 2013185425A1
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- transistor
- driving voltage
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- pixel
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000004973 liquid crystal related substance Substances 0.000 claims description 30
- 239000003990 capacitor Substances 0.000 claims description 11
- 239000010409 thin film Substances 0.000 claims description 5
- 239000000758 substrate Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 101100006548 Mus musculus Clcn2 gene Proteins 0.000 description 1
- 206010047571 Visual impairment Diseases 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/13624—Active matrix addressed cells having more than one switching element per pixel
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- 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
- 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
- G09G3/36—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 using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
- G09G3/3659—Control of matrices with row and column drivers using an active matrix the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0252—Improving the response speed
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame
Definitions
- Pixel structure display device and overvoltage driving method
- Embodiments of the present invention relate to a pixel structure, a display device, and an overvoltage driving method. Background technique
- the liquid crystal display has the advantages of being thin and light, low in power consumption, no flicker, and beautiful in appearance. Since liquid crystal molecules have a slow response characteristic, when a liquid crystal display displays a fast moving image, a so-called motion blur phenomenon, commonly known as "tailing” or “afterimage", is generated.
- a so-called motion blur phenomenon commonly known as "tailing” or "afterimage”
- the response time of liquid crystal display on the one hand, through continuous improvement of the material preparation process, research and development of new liquid crystal materials, so that the liquid crystal material is not only more stable, but also less viscous, thereby greatly improving the liquid crystal response speed, on the other hand
- By actively developing new drive technologies we can further improve the response speed of liquid crystals and reduce the blurring and flicker of motion. Since the time of liquid crystal deflection is related to the driving voltage, an overvoltage driving method has been proposed to improve the liquid crystal response speed.
- Figure 1 shows an existing pixel structure with each sub-pixel controlled by a thin film transistor (TFT).
- TFT thin film transistor
- Ql and Q2 are thin film transistors (TFTs)
- Csl and Cs2 are storage capacitors
- Clcl and Clc2 are pixel capacitances (also referred to as liquid crystal capacitors) formed between the pixel electrode and the common electrode VCOM.
- FIG. 2 is a timing diagram of voltages generated by overvoltage driving of the pixel structure of FIG. 1.
- N1, N, and N+1 represent adjacent three frames
- Vt represents an overvoltage voltage required to display a target gray scale
- curve Va represents a voltage actually generated with deflection of the liquid crystal.
- the voltage Vr for example, 5 V
- the target voltage for example, 3 V
- the obvious defect is that the liquid crystal is easily at the target luminance. Keeping the time too short, it is still relatively easy to cause image quality problems such as motion blur. So, the technology that needs to be solved The problem is how to achieve accurate control of the overdrive voltage. Summary of the invention
- One aspect of the present invention provides a pixel structure including: first and second gate lines G1, G2, first and second data lines SI, S2, a first transistor Q1, a second transistor Q2, a pixel electrode, and a common electrode.
- a gate of the first transistor Q1 is connected to the first gate line G1
- one of the source and the drain of the first transistor Q1 is connected to the first data line S1
- another source and drain of the first transistor Q1 a pole is connected to the pixel electrode
- a gate of the second transistor Q2 is connected to the second gate line G2
- the first transistor Q1 and the second transistor Q2 are thin film transistors.
- one of the storage capacitors is electrically connected to the pixel electrode.
- Another aspect of the present invention provides a display device including the above-described pixel structure.
- the display device is a liquid crystal panel or an organic light emitting diode display panel.
- the magnitudes of the first source driving voltage Vs1 and the second source driving voltage Vs2 are controlled by a driver.
- the magnitude of the predetermined interval time depends on the display response time and the values of the first and second source driving voltages Vsl, Vs2.
- the first source driving voltage Vs1 is an overdrive voltage
- the second source driving voltage Vs2 is a voltage required to display a target gray scale, and Vs1>Vs2.
- Figure 1 is a diagram of a conventional pixel structure
- FIG. 2 is a voltage timing diagram generated by overvoltage driving the pixel structure of FIG. 1;
- FIG. 3 is a diagram showing a pixel structure of the present invention.
- FIG. 4 is a voltage timing diagram generated by overvoltage driving the pixel structure of FIG. detailed description
- the embodiment provides a pixel structure 100 of a liquid crystal panel, including: a first transistor Q1, a second transistor Q2, a pixel electrode 10, a common electrode 11, and a storage capacitor Cs.
- the gate lines G1 and G2 are juxtaposed to each other for driving the pixel, and the gate lines G1 and G2 may be located on different sides of the pixel; the data lines S1 and S2 are juxtaposed with each other for driving the pixel, and the data lines S1 and S2 may be located at the pixel. The same side.
- the gate of the first transistor Q1 is connected to the first gate line G1, and the source is connected to the first data line S1, that is, the gate line G1 and the data line S1 are used to drive the first transistor Q1;
- the gate of Q2 is connected to the second gate line G2, and the source is connected to the second data line S2, that is, the gate line G2 and the data line S2 are used to drive the first transistor Q2.
- a drain of the first transistor Q1 is connected to one electrode of the storage capacitor and a pixel electrode 10, and a drain of the second transistor Q2 is connected to the pixel electrode 10, and the pixel electrode 10 and the common electrode 11 are connected A pixel capacitance Clc is formed therebetween.
- Skill The skilled artisan will appreciate that the source and drain of the transistor can be interchanged under predetermined conditions, so that the source and drain can be collectively referred to as the source and drain.
- both Q1 and Q2 are thin film transistors (TFTs).
- a pixel capacitance (also referred to as a liquid crystal capacitance) Clc formed between the pixel electrode 10 and the common electrode 11 is used to drive the liquid crystal in the liquid crystal panel.
- the storage capacitor Cs is used for stable display and it can be formed in a variety of ways.
- a storage electrode for storing a capacitance Cs is formed on the array substrate, and the storage electrode and the pixel electrode are at least partially overlapped with an insulating layer to constitute a capacitor; a common voltage is applied to the storage electrode.
- one electrode of the storage capacitor is a storage electrode and the other electrode is a pixel electrode or is connected to a pixel electrode.
- the pixel structure of this embodiment may also not include a storage capacitor.
- the liquid crystal panel using the pixel structure of the present embodiment includes an array substrate and an opposite substrate.
- the array substrate includes, for example, a plurality of pixels arranged in an array, each pixel having a pixel structure as described above.
- the pixel electrode 10 and the common electrode 11 may both be formed on an array substrate such as an in-plane switching (IPS) type or fringe field switching (FFS) type liquid crystal panel, or the pixel electrode 10 is formed on the array substrate, and the common electrode 11 Formed on the opposite substrate, such as a twisted nematic (TN) type liquid crystal panel.
- the opposite substrate is, for example, a color film substrate.
- the liquid crystal panel further includes a backlight that provides backlighting for the array substrate and a driver (e.g., IC) that inputs the gate signal and the data signal.
- a driver e.g., IC
- the pixel structure of this embodiment can be used for an organic light emitting diode (OLED) display panel or the like in addition to a liquid crystal panel.
- OLED organic light emitting diode
- the display panel can be used, for example, in various applications such as a liquid crystal display, a television, and a mobile phone.
- This embodiment provides a display device (e.g., a liquid crystal display) including the pixel structure of the first embodiment.
- the display device is, for example, a liquid crystal panel, an OLED display panel, or the like.
- This embodiment provides an overvoltage driving method, which is applied to the pixel structure of the first embodiment.
- the method includes the following steps.
- A1 applying a first gate drive to the gate of the first transistor Q1 through the first gate line G1 a voltage Vgl, thereby opening the first transistor Q1, while applying a first source driving voltage Vs1 to the source of the first transistor Q1 through the first data line SI, the first transistor Q1 and the first source driving voltage Vsl Output to the pixel electrode;
- A2 applying a first gate driving voltage Vgl to the first transistor Q1 for a predetermined time (such as n seconds), applying a second gate driving voltage Vg2 to the second transistor Q2 through the second gate line G2, Therefore, the second transistor Q2 is turned on, and the driving voltages Vgl and Vg2 are the same; and the second source driving voltage Vs2 is applied to the source of the second transistor Q2 through the second data line S2, and the second transistor Q2 The two source driving voltage Vs2 is output to the pixel electrode.
- a predetermined time such as n seconds
- the first source driving voltage Vs1 applied to the first transistor Q1 is an overdrive voltage
- the second source driving voltage Vs2 applied to the second transistor Q2 is a voltage required to display a target gray scale, that is, a target voltage, Vsl > Vs2.
- the magnitudes of the first source driving voltage Vsl and the second source driving voltage Vs2 are all controlled by an external driver (IC).
- the predetermined interval time (n seconds) can be detected by the optical device according to the response time of the display device (e.g., liquid crystal panel) and the values of the driving voltages Vsl, Vs2.
- Overdriving is achieved by controlling the magnitude of the first source driving voltage Vs1 and the second source driving voltage Vs2, the size of the predetermined interval time (n seconds) (ie, the time interval of the voltage applied to the sources of the transistors Q1, Q2) Accurate control.
- n seconds ie, the time interval of the voltage applied to the sources of the transistors Q1, Q2
- the voltage VOD applied to the pixel structure shown in FIG. 3 is: for a predetermined period of time ( Within 5 seconds, it is 5V, and after the predetermined time period n, it is 3V. Since the value of n can be pre-calculated, the target voltage of 3V is directly applied n seconds after the application of the overvoltage of 5V, thus achieving accurate control of the overdrive, and thus compared to the prior art shown in FIGS. 1 and 2. With the method of the embodiment, the retention time of the liquid crystal at the target brightness is too short, and the image quality problem such as motion blur is caused, thereby realizing the normal display of the target brightness.
- the embodiment of the present invention realizes accurate control of overdrive by controlling two pixel transistors to control one pixel structure, thereby realizing normal display of target luminance.
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Abstract
一种液晶面板的像素结构、显示装置及过压驱动方法,像素结构包括:第一晶体管(Q1)、第二晶体管(Q2)、像素电极、公共电极以及存储电容(Cs),所述第一晶体管(Q1)的栅极连接第一栅线(G1),源极连接第一数据线(S1),第二晶体管(Q2)的栅极连接第二栅线(G2),源极连接第二数据线(S2);所述第一晶体管(Q1)的漏极与所述存储电容(Cs)以及像素电极连接,所述第二晶体管(Q2)的漏极与所述像素电极连接,所述像素电极与公共电极之间形成像素电容(C1c)。通过采用两个晶体管控制一个像素结构,实现了过驱动电压的准确控制,从而实现了目标亮度的正常显示。
Description
像素结构、 显示装置及过压驱动方法 技术领域
本发明的实施例涉及一种像素结构、 显示装置及过压驱动方法。 背景技术
液晶显示器具有轻薄、 耗电少、 无闪烁、 造型美观等优点。 由于液晶分 子具有响应慢的特性, 所以液晶显示器在显示快速运动的图像时, 会产生所 谓运动模糊的现象, 俗称"拖尾"或者"残影"。 对于改进液晶显示的响应时间, 人们一方面通过不断改进材料的制备工艺, 研究开发新型液晶材料, 使得液 晶材料不但更加稳定, 而且粘性更低, 从而极大提高了液晶响应速度, 另一 方面还通过积极开发新型驱动技术, 以进一步提高液晶响应速度, 减少运动 图 莫糊和闪烁。 由于液晶偏转的时间跟驱动电压有关系, 于是人们提出了 过压驱动的办法来提高液晶响应速度。
传统的过压驱动方法普遍存在诸如下面的缺陷:比如驱动电压不易控制, 驱动电压过大会造成正常显示时间不够, 驱动电压过小则达不到显示目标灰 阶所需的过压电压, 所以经常会出现运动模糊甚至反白的想象。
图 1所示为现有的像素结构, 每个亚像素由一个薄膜晶体管 (TFT )控 制。 栅线 G1等和数据线 Sl、 S2等交叉限定了各个像素。 图中, Ql、 Q2为 薄膜晶体管 (TFT ), Csl、 Cs2为存储电容, Clcl、 Clc2为像素电极和公共 电极 VCOM之间所形成的像素电容(也称为液晶电容)。 经栅线 Gl、 G2所 施加的电压为栅极驱动电压 Vgl、 Vg2, 对 TFT起到开关的作用; 经数据线 Sl、 S2所施加的电压为 TFT的源极驱动电压 Vsl、 Vs2, 即实际加载在像素 上的电压。图 2所示为对图 1的像素结构进行过压驱动所产生的电压时序图。 图 2中, N-l、 N、 N+l表示相邻的三帧画面, Vt表示显示目标灰阶所需的 过压电压, 曲线 Va表示随着液晶的偏转实际产生的电压。 图 1和图 2所示 的过压驱动方式中, 实际加载在像素上的电压 Vr (例如 5V ) 比目标电压大 (例如 3V ), 这样造成的明显的缺陷就是容易使液晶在目标亮度时的保持时 间过短, 因此仍然比较容易造成运动模糊等画质问题。 所以, 需要解决的技
术问题是如何实现过驱动电压的准确控制。 发明内容
本发明的一个方面提供了一种像素结构, 包括: 第一和第二栅线 Gl、 G2、 第一和第二数据线 SI、 S2、 第一晶体管 Ql、 第二晶体管 Q2、 像素电极和公共 电极。 所述第一晶体管 Q1的栅极连接所述第一栅线 G1 , 所述第一晶体管 Q1 的源漏极之一连接所述第一数据线 S1 , 所述第一晶体管 Q1的另一个源漏极与 所述像素电极连接, 所述第二晶体管 Q2的栅极连接所述第二栅线 G2, 所述第 二晶体管 Q2的源漏极之一连接所述第二数据线 S2, 所述第二晶体管 Q2的另一 个源漏极与所述像素电极连接, 所述像素电极与公共电极之间形成像素电容。
例如, 所述第一晶体管 Q1和第二晶体管 Q2均为薄膜晶体管。
例如, 所述存储电容的一极为所述像素电极或与所述像素电极电连接。 本发明的另一个方面提供了一种显示装置, 包括上述的像素结构。
例如, 所述显示装置为液晶面板或有机发光二极管显示面板。
本发明的另一个方面提供了一种过压驱动方法, 用于上述像素结构, 包 括:
通过所述第一栅线 G1对所述第一晶体管 Q1施加第一栅极驱动电压 Vgl , 同时通过第一数据线 S2对第一晶体管 Q1施加第一源极驱动电压 Vsl , 第一晶 体管 Q1再将所述第一源极驱动电压 Vsl输出到所述像素电极;
对所述第一晶体管 Q1施加第一栅极驱动电压 Vgl之后预定间隔时间, 通过所述第二栅线 G2对所述第二晶体管 Q2施加第二栅极驱动电压 Vg2, Vgl 与 Vg2的波形相同, 同时通过第二数据线 S2对第二晶体管 Q2施加第二源极 驱动电压 Vs2,第二晶体管 Q2再将所述第二源极驱动电压 Vs2输出到所述像 素电极。
例如, 所述第一源极驱动电压 Vsl以及所述第二源极驱动电压 Vs2的大 小均由驱动器控制。
例如, 所述预定间隔时间的大小根据显示响应时间以及第一、 第二源极 驱动电压 Vsl、 Vs2的值而定。
例如,所述第一源极驱动电压 Vsl为过驱动电压,第二源极驱动电压 Vs2 为显示目标灰阶所需要的电压, 且 Vsl> Vs2。
上述技术方案具有如下优点: 通过釆用两个晶体管控制一个像素结构, 实现了过驱动的准确控制, 从而实现了目标亮度的正常显示。 附图说明
为了更清楚地说明本发明实施例的技术方案, 下面将对实施例的附图作 简单地介绍, 显而易见地, 下面描述中的附图仅仅涉及本发明的一些实施例, 而非对本发明的限制。
图 1为现有的像素结构图;
图 2为对图 1的像素结构进行过压驱动所产生的电压时序图;
图 3为本发明的像素结构图;
图 4为对图 3的像素结构进行过压驱动所产生的电压时序图。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚, 下面将结合本发 明实施例的附图, 对本发明实施例的技术方案进行清楚、 完整地描述。 显然, 所描述的实施例是本发明的一部分实施例, 而不是全部的实施例。 基于所描 述的本发明的实施例, 本领域普通技术人员在无需创造性劳动的前提下所获 得的所有其他实施例, 都属于本发明保护的范围。
实施例一
如图 3所示, 本实施例提供了一种液晶面板的像素结构 100, 包括: 第 一晶体管 Ql、 第二晶体管 Q2、像素电极 10、公共电极 11以及存储电容 Cs。
栅线 G1和 G2彼此并列, 都用于驱动该像素, 栅线 G1和 G2可以位于 像素的不同侧; 数据线 S1和 S2彼此并列, 都用于驱动该像素, 数据线 S1 和 S2可以位于像素的同一侧。
更具体而言, 所述第一晶体管 Q1的栅极连接第一栅线 G1 , 源极连接第 一数据线 S1 , 即, 栅线 G1和数据线 S1用于驱动第一晶体管 Q1; 第二晶体 管 Q2的栅极连接第二栅线 G2, 源极连接第二数据线 S2, 即, 栅线 G2和数 据线 S2用于驱动第一晶体管 Q2。 所述第一晶体管 Q1的漏极与所述存储电 容的一个电极以及像素电极 10连接,所述第二晶体管 Q2的漏极与所述像素 电极 10连接, 所述像素电极 10与公共电极 11之间形成像素电容 Clc。 本领
域技术人员可以了解, 晶体管的源极和漏极可以预定条件下互换, 因此可以 将源极和漏极统称为源漏极。
例如, Q1和 Q2均为薄膜晶体管 (TFT )。
像素电极 10和公共电极 11之间所形成的像素电容(也称为液晶电容) Clc, 用于驱动液晶面板中的液晶。
存储电容 Cs用于稳定显示, 它可以通过多种方式形成。 例如, 在阵列 基板上形成用于存储电容 Cs 的存储电极, 该存储电极与像素电极间隔着绝 缘层至少部分重叠而构成电容; 该存储电极被施加公共电压。 在该示例中, 该存储电容的一个电极为存储电极, 而另一个电极为像素电极或与像素电极 相连。
本实施例的像素结构也可以不包括存储电容。
釆用本实施例的像素结构的液晶面板包括阵列基板和相对基板。 该阵列 基板例如包括排列为阵列的多个像素, 每个像素具有如上所述的像素结构。 同时,像素电极 10和公共电极 11可以都形成阵列基板上,例如面内切换( IPS ) 型或边缘场切换(FFS )型液晶面板,或者像素电极 10形成在阵列基板之上, 而公共电极 11形成在对向基板之上, 例如扭曲向列 (TN )型液晶面板。 该 对向基板例如为彩膜基板。 阵列基板的每个像素的像素电极和公共电极用于 施加电场对液晶材料的旋转的程度进行控制从而进行显示操作。 在一些示例 中, 该液晶面板还包括为阵列基板提供背光的背光源以及输入栅信号和数据 信号的驱动器(例如 IC )等部件。
本实施例的像素结构除用于液晶面板之外, 还可以用于有机发光二极管 ( OLED )显示面板等。
该显示面板例如可以用于液晶显示器、 电视、 手机等多种应用。
实施例二
本实施例提供了一种显示装置(例如液晶显示器), 包括具有实施例一所 述的像素结构。 该显示装置例如为液晶面板、 OLED显示面板等。
实施例三
本实施例提供了一种过压驱动方法, 其应用于实施例一的像素结构。 该 方法包括以下步骤。
A1、通过所述第一栅线 G1对所述第一晶体管 Q1的栅极施加第一栅极驱动
电压 Vgl , 从而将第一晶体管 Ql打开, 同时通过第一数据线 SI对第一晶体管 Q1的源极施加第一源极驱动电压 Vsl , 第一晶体管 Ql再将所述第一源极驱动 电压 Vsl输出到所述像素电极;
A2、对所述第一晶体管 Q1施加第一栅极驱动电压 Vgl之后预定时间(如 n秒 ), 通过所述第二栅线 G2对所述第二晶体管 Q2施加第二栅极驱动电压 Vg2, 从而将第二晶体管 Q2打开, 驱动电压 Vgl与 Vg2的波形相同; 同时 通过第二数据线 S2对第二晶体管 Q2的源极施加第二源极驱动电压 Vs2, 第 二晶体管 Q2再将所述第二源极驱动电压 Vs2输出到所述像素电极。
这里,施加给第一晶体管 Q1的第一源极驱动电压 Vsl是过驱动电压,施 加给第二晶体管 Q2的第二源极驱动电压 Vs2是显示目标灰阶所需要的电压, 即目标电压, Vsl> Vs2。
所述第一源极驱动电压 Vsl 以及第二源极驱动电压 Vs2的大小均由外部 驱动器(IC )控制。 预定间隔时间 (n秒)的大小可以才艮据显示装置(例如液 晶面板)的响应时间以及驱动电压 Vsl、 Vs2的值由光学设备检测得出。 通过 控制第一源极驱动电压 Vsl 以及第二源极驱动电压 Vs2的大小、 预定间隔时 间 ( n秒)的大小(即施加给晶体管 Ql、 Q2源极的电压的时间间隔 )来实现 过驱动的准确控制。 以下举例说明。
如图 4所示,假设第一源极驱动电压 Vsl为 5 V, 第二源极驱动电压 Vs2为 3 V, 那么对图 3所示的像素结构所施加的电压 VOD为: 在预定时间段(n秒) 以内为 5V, 在预定时间段 n之后则为 3V。 由于 n值可以预先计算出来, 因此在 施加 5V的过压之后 n秒再直接施加目标电压 3V, 这样就实现了过驱动的准确 控制, 因此相比于图 1和图 2所示的现有技术, 使用本实施例的方法不容易出 现液晶在目标亮度时的保持时间过短, 以及运动模糊等画质问题, 从而实现 了目标亮度的正常显示。
由以上描述可以看出, 本发明的实施例通过釆用两个晶体管控制一个像 素结构, 实现了过驱动的准确控制, 从而实现了目标亮度的正常显示。
以上所述仅是本发明的优选实施方式, 而非用于限制本发明的保护范围, 本发明的保护范围由所附的权利要求确定。
Claims
1、 一种像素结构, 包括: 第一和第二栅线 Gl、 G2、 第一和第二数据线 Sl、 S2、 第一晶体管 Ql、 第二晶体管 Q2、 像素电极和公共电极, 其中,
所述第一晶体管 Q1的栅极连接所述第一栅线 G1 ,所述第一晶体管 Q1的源 漏极之一连接所述第一数据线 S1 , 所述第一晶体管 Q1的另一个源漏极与所述 像素电极连接,
所述第二晶体管 Q2的栅极连接所述第二栅线 G2,所述第二晶体管 Q2的源 漏极之一连接所述第二数据线 S2 , 所述第二晶体管 Q2的另一个源漏极与所述 像素电极连接,
所述像素电极与公共电极之间形成像素电容。
2、 如权利要求 1所述的像素结构, 其中, 所述第一晶体管 Q1和第二晶体 管 Q2均为薄膜晶体管。
3、 如权利要求 1或 2所述的像素结构, 还包括存储电容, 其中, 所述存储 电容的一极为所述像素电极或与所述像素电极电连接。
4、 一种显示装置, 包括权利要求 1-3任一所述的像素结构。
5、 根据权利要求 4所述的显示装置, 其中, 所述显示装置为液晶面板或 有机发光二极管显示面板。
6、 一种过压驱动方法, 用于权利要求 1-3任一所述的像素结构, 包括: 通过所述第一栅线 G1对所述第一晶体管 Q1施加第一栅极驱动电压 Vgl , 同时通过第一数据线 S2对第一晶体管 Q1施加第一源极驱动电压 Vsl , 第一晶 体管 Q1再将所述第一源极驱动电压 Vsl输出到所述像素电极;
对所述第一晶体管 Q1施加第一栅极驱动电压 Vgl之后预定间隔时间, 通过所述第二栅线 G2对所述第二晶体管 Q2施加第二栅极驱动电压 Vg2, Vgl 与 Vg2的波形相同, 同时通过第二数据线 S2对第二晶体管 Q2施加第二源极 驱动电压 Vs2,第二晶体管 Q2再将所述第二源极驱动电压 Vs2输出到所述像 素电极。
7、 如权利要求 6所述的方法, 其中, 所述第一源极驱动电压 Vsl以及所 述第二源极驱动电压 Vs2的大小均由驱动器控制。
8、 如权利要求 6或 7所述的方法, 其中, 所述预定间隔时间的大小根据
显示响应时间以及第一、 第二源极驱动电压 Vsl、 Vs2的值而定。
9、 如权利要求 6-8任一所述所述的方法, 其中, 所述第一源极驱动电压 Vsl为过驱动电压, 第二源极驱动电压 Vs2为显示目标灰阶所需要的电压, 且 Vsl> Vs2。
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