JP2008191210A - Driving method of liquid crystal display element, and liquid crystal display - Google Patents

Driving method of liquid crystal display element, and liquid crystal display Download PDF

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JP2008191210A
JP2008191210A JP2007022739A JP2007022739A JP2008191210A JP 2008191210 A JP2008191210 A JP 2008191210A JP 2007022739 A JP2007022739 A JP 2007022739A JP 2007022739 A JP2007022739 A JP 2007022739A JP 2008191210 A JP2008191210 A JP 2008191210A
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crystal display
pixel electrode
signal voltage
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JP4249785B2 (en
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Masaru Yasui
勝 安居
Masahide Inoue
昌秀 井上
Masahiro Yoshiga
正博 吉賀
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TPO Displays Corp
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Toppoly Optoelectronics Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving method for driving a liquid crystal display element having low power consumption. <P>SOLUTION: The driving method for liquid crystal display element is for driving a liquid crystal display element that includes a switch element, a pixel electrode, and an auxiliary capacitor using the pixel electrode as one of electrodes. The other electrode of the auxiliary capacitor is applied with a voltage, which varies from a low level to a high level right after the voltage of the pixel electrode is switched from a negative-polarity signal voltage to a positive-polarity signal voltage and varies from high level to low level, immediately prior the switch element is turned on for switching, from positive-polarity signal to negative-polarity signal voltage. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、液晶表示素子の駆動方法に関し、特に、駆動回路に用いられるＴＦＴ素子の低電圧化、小型化を図り、したがって低コストとし、さらに低消費電力での駆動方法の実現に関する。   The present invention relates to a method for driving a liquid crystal display element, and more particularly, to a reduction in voltage and size of a TFT element used in a drive circuit, and hence to a reduction in cost and further to a drive method with low power consumption.

従来から、画素ごとにスイッチ素子をつけ、スイッチ素子の制御によって画素を駆動するアクティブマトリックス型液晶表示装置が知られている。   2. Description of the Related Art Conventionally, an active matrix liquid crystal display device in which a switch element is attached to each pixel and the pixel is driven by controlling the switch element is known.

アクティブマトリックス型液晶表示装置は、液晶を挟む２枚の基板のうちの一方の基板上に、同方向に並んだ複数のソースラインとソースラインに直交する複数のゲートラインが形成されている。ソースラインとゲートラインの交差部には、スイッチ素子であるＴＦＴと、液晶素子に画素値に応じた電圧を印加する画素電極と、画素電極に並列に接続された補助容量とを有する画素が設けられている。   In an active matrix liquid crystal display device, a plurality of source lines arranged in the same direction and a plurality of gate lines orthogonal to the source lines are formed on one of two substrates sandwiching liquid crystal. A pixel having a TFT as a switching element, a pixel electrode for applying a voltage corresponding to the pixel value to the liquid crystal element, and an auxiliary capacitor connected in parallel to the pixel electrode is provided at the intersection of the source line and the gate line. It has been.

液晶素子と並列に接続された補助容量は、合成容量を大きくすることにより、ＴＦＴのドレイン−ゲート間の寄生容量の影響や、スイッチ素子のオフ期間におけるリーク電流を低減させる役割を有する。   The auxiliary capacitor connected in parallel with the liquid crystal element has a role of reducing the influence of the parasitic capacitance between the drain and gate of the TFT and the leakage current in the off period of the switch element by increasing the combined capacitance.

液晶表示装置に関しては、これまでに様々な技術が研究されており、低消費電力で駆動する技術も提案されている。特許文献１は、補助容量に印加する電圧を画素電極電圧と共通電極電圧との関係に応じて変化させることにより、スイッチ素子のソース電圧の振幅を小さくすることによって駆動回路の電源電圧を低くし、低消費電力化を図る発明を開示している。   As for the liquid crystal display device, various techniques have been studied so far, and a technique for driving with low power consumption has also been proposed. In Patent Document 1, the voltage applied to the auxiliary capacitor is changed according to the relationship between the pixel electrode voltage and the common electrode voltage, thereby reducing the amplitude of the source voltage of the switch element, thereby reducing the power supply voltage of the drive circuit. An invention for reducing power consumption is disclosed.

図３は、特許文献１に記載された液晶表示装置の駆動時の信号波形図である。図３では、キックバックシフトや、電流のリークによる電圧のシフトを省略して記載している。特許文献１に記載された液晶表示装置では、補助容量に印加する電圧を、ドレイン電圧（画素電極電圧）にソース信号の正極性信号電圧が書き込まれて、スイッチ素子がオフした直後に低レベルから高レベルに変化させる（タイミングｔ１１）。これにより、液晶容量と補助容量との間で電荷再配分が生じて、画素電圧がΔＶP1だけ上昇する。逆に、ドレイン電圧にソース信号の負極性信号電圧が書き込まれて、スイッチ素子がオフした直後に高レベルから低レベルに変化させる（タイミングｔ１２）。これにより、液晶容量と補助容量との間で電荷再配分が生じて、画素電圧がΔＶP2だけ下降する。このように補助容量に印加する電圧によってドレイン電圧を制御できるので、その分だけソース電圧の振幅を小さくすることができる。
特開２０００−８１６０６号公報 FIG. 3 is a signal waveform diagram when the liquid crystal display device described in Patent Document 1 is driven. In FIG. 3, the kickback shift and the voltage shift due to current leakage are omitted. In the liquid crystal display device described in Patent Document 1, the voltage applied to the auxiliary capacitor is changed from a low level immediately after the positive signal voltage of the source signal is written to the drain voltage (pixel electrode voltage) and the switch element is turned off. The level is changed to a high level (timing t11). As a result, charge redistribution occurs between the liquid crystal capacitor and the auxiliary capacitor, and the pixel voltage increases by ΔV P1 . On the contrary, the negative signal voltage of the source signal is written in the drain voltage, and immediately after the switch element is turned off, it is changed from the high level to the low level (timing t12). As a result, charge redistribution occurs between the liquid crystal capacitor and the auxiliary capacitor, and the pixel voltage decreases by ΔV P2 . Since the drain voltage can be controlled by the voltage applied to the auxiliary capacitor in this way, the amplitude of the source voltage can be reduced accordingly.
JP 2000-81606 A

本発明は、低消費電力化が要望されている中で、特許文献１に記載された方法より、さらに低消費電力で駆動可能な液晶表示装置を提供することを目的とする。   An object of the present invention is to provide a liquid crystal display device that can be driven with lower power consumption than the method described in Japanese Patent Application Laid-Open No. H10-228707, while lower power consumption is desired.

本発明の液晶表示素子の駆動方法は、スイッチ素子と、画素電極と、前記画素電極を一方の電極として用いる補助容量とを備えた液晶表示素子の駆動方法であって、前記補助容量の他方の電極に、前記画素電極の電圧を負極性信号電圧から正極性信号電圧に切り替えた直後に低レベルから高レベルに変化し、正極性信号電圧から負極性信号電圧に切り替えるために前記スイッチ素子をオンする直前に高レベルから低レベルに変化する電圧を印加する。   The liquid crystal display element driving method of the present invention is a liquid crystal display element driving method comprising a switch element, a pixel electrode, and an auxiliary capacitor using the pixel electrode as one electrode, and the other of the auxiliary capacitors. Immediately after switching the voltage of the pixel electrode from a negative signal voltage to a positive signal voltage, the switch element is turned on to switch from a positive signal voltage to a negative signal voltage. Immediately before, a voltage that changes from a high level to a low level is applied.

本発明では、正極性信号電圧から負極性信号電圧に切り替えるためにスイッチ素子をオンする直前に、補助容量の他方の電極に印加する電圧を高レベルから低レベルに変化させる。このようにスイッチ素子をオンする前にあらかじめ補助容量に印加する電圧を低レベルにしておくことにより、スイッチ素子のオフ期間に、画素電圧を低下させる補助容量の電圧制御を行う必要がない。スイッチ素子のオフ期間に、画素からの電流のリークを防止するためには、画素電圧に対してスイッチ素子のゲート電圧を所定の閾値以上低い電圧値とする必要があるが、本発明によればスイッチ素子のオフ期間に画素電圧を低下させないので、ゲート電圧の振幅を小さくすることができ、低消費電力化を図ることができる。   In the present invention, the voltage applied to the other electrode of the auxiliary capacitor is changed from a high level to a low level immediately before turning on the switch element in order to switch from the positive signal voltage to the negative signal voltage. Thus, by setting the voltage applied to the auxiliary capacitor to a low level in advance before the switch element is turned on, it is not necessary to perform voltage control of the auxiliary capacitor for reducing the pixel voltage during the OFF period of the switch element. In order to prevent current leakage from the pixel during the off period of the switch element, the gate voltage of the switch element needs to be lower than the pixel voltage by a predetermined threshold value or more. Since the pixel voltage is not lowered during the OFF period of the switch element, the amplitude of the gate voltage can be reduced and the power consumption can be reduced.

本発明の液晶表示装置は、スイッチ素子と、画素電極と、前記画素電極を一方の電極として用いる補助容量とを備え、前記補助容量の他方の電極に、前記画素電極の電圧を負極性信号電圧から正極性信号電圧に切り替えた直後に低レベルから高レベルに変化し、正極性信号電圧から負極性信号電圧に切り替えるために前記スイッチ素子をオンする直前に高レベルから低レベルに変化する電圧を印加する。   The liquid crystal display device of the present invention includes a switch element, a pixel electrode, and an auxiliary capacitor using the pixel electrode as one electrode, and the voltage of the pixel electrode is set to the negative signal voltage on the other electrode of the auxiliary capacitor. Immediately after switching from the positive signal voltage to the positive signal voltage, the voltage changes from the low level to the high level, and the voltage that changes from the high level to the low level immediately before the switch element is turned on to switch from the positive signal voltage to the negative signal voltage. Apply.

この構成により、本発明の液晶表示素子の駆動方法と同様に、スイッチ素子のオフ期間に画素電圧を低下させないので、ゲート電圧の振幅を小さくでき、駆動回路に用いられるＴＦＴ素子の低電圧化、小型化を図り、したがって低コストとし、低消費電力化を図ることができる。   With this configuration, as in the liquid crystal display element driving method of the present invention, the pixel voltage is not lowered during the off period of the switching element, so that the amplitude of the gate voltage can be reduced, and the voltage of the TFT element used in the driving circuit can be reduced. It is possible to reduce the size, thus reducing the cost and reducing power consumption.

本発明によれば、画素電圧が負極性に切り替わった後のオフ期間に、画素電圧を低下させないので、ゲート電圧の振幅を小さくすることができ、低消費電力化を図ることができる。   According to the present invention, since the pixel voltage is not lowered in the off period after the pixel voltage is switched to the negative polarity, the amplitude of the gate voltage can be reduced and the power consumption can be reduced.

以下、本発明の実施の形態の液晶表示装置について図面を参照しながら説明する。
図１は、本実施の形態の液晶表示装置１の等価回路を示す図である。液晶表示装置１は、同方向に並んだ複数のソースライン１０と、ソースライン１０に直交する複数のゲートライン１２とを有する。ソースライン１０とゲートライン１２の交差部には、スイッチ素子であるＴＦＴ１４と、液晶素子１６に画素値に応じた電圧を印加する画素電極１８と、画素電極１８に並列に接続された補助容量２０とを有する画素が設けられている。液晶を挟む２枚の基板のうちの他方の基板には、一体的に共通電極２２が設けられている。 Hereinafter, a liquid crystal display device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an equivalent circuit of the liquid crystal display device 1 of the present embodiment. The liquid crystal display device 1 includes a plurality of source lines 10 arranged in the same direction and a plurality of gate lines 12 orthogonal to the source lines 10. At the intersection of the source line 10 and the gate line 12, a TFT 14 that is a switching element, a pixel electrode 18 that applies a voltage corresponding to a pixel value to the liquid crystal element 16, and an auxiliary capacitor 20 that is connected in parallel to the pixel electrode 18. Are provided. A common electrode 22 is integrally provided on the other of the two substrates sandwiching the liquid crystal.

補助容量２０は、補助容量ライン２４に接続されている。補助容量ライン２４は、同一のゲートライン１２に接続された複数の画素に共通となっている。   The auxiliary capacitor 20 is connected to the auxiliary capacitor line 24. The auxiliary capacitance line 24 is common to a plurality of pixels connected to the same gate line 12.

図２は、本実施の形態の液晶表示装置１を駆動する信号波形を示す図である。図２では、タイミングｔ１以前は、画素電極（ドレイン電圧）１８に負極性信号電圧が印加されている。タイミングｔ１に、ＴＦＴ１４のゲートに、ソース電圧より所定の閾値ＶON以上高いゲート電圧が印加されると、ＴＦＴ１４がオンされてソースライン１０と画素電極１８とが導通し、ドレイン電圧、すなわち画素電極１８の電圧値がソース電圧と等しくなる。 FIG. 2 is a diagram showing signal waveforms for driving the liquid crystal display device 1 of the present embodiment. In FIG. 2, a negative signal voltage is applied to the pixel electrode (drain voltage) 18 before timing t1. When a gate voltage higher than the source voltage by a predetermined threshold V ON or more is applied to the gate of the TFT 14 at timing t1, the TFT 14 is turned on and the source line 10 and the pixel electrode 18 become conductive, and the drain voltage, that is, the pixel electrode The voltage value of 18 becomes equal to the source voltage.

タイミングｔ２に、ゲート電圧を下げ、ＴＦＴ１４をオフした直後、タイミングｔ３に補助容量電圧を低レベルから高レベルに変化させる。これにより、液晶容量と補助容量２０との間で電荷再配分が生じて、ドレイン電圧がΔＶPだけ上昇する。 Immediately after the gate voltage is lowered at the timing t2 and the TFT 14 is turned off, the auxiliary capacitance voltage is changed from the low level to the high level at the timing t3. As a result, charge redistribution occurs between the liquid crystal capacitor and the auxiliary capacitor 20, and the drain voltage rises by ΔV P.

次に、液晶表示装置１の画素電極１８に印加する電圧を負極性信号電圧に切り替える直前のタイミングｔ４に、補助容量電圧を高レベルから低レベルに変化させる。これにより、液晶容量と補助容量２０との間で電荷再配分が生じて、画素電極１８の電圧（ドレイン電圧）がΔＶPだけ低下する。続いて、タイミングｔ５に、ＴＦＴ１４のゲートに、ソース電圧より所定の閾値ＶON以上高いゲート電圧が印加されると、ＴＦＴ１４がオンされてソースライン１０と画素電極１８とが導通し、画素電極１８の電圧値がソース電圧と等しくなる。タイミングｔ６にゲート電圧を低下させて、ＴＦＴ１４のスイッチをオフにする。 Next, the auxiliary capacitance voltage is changed from the high level to the low level at timing t4 immediately before the voltage applied to the pixel electrode 18 of the liquid crystal display device 1 is switched to the negative signal voltage. As a result, charge redistribution occurs between the liquid crystal capacitor and the auxiliary capacitor 20, and the voltage (drain voltage) of the pixel electrode 18 decreases by ΔV P. Subsequently, at a timing t5, when a gate voltage higher than the source voltage by a predetermined threshold V ON or more is applied to the gate of the TFT 14, the TFT 14 is turned on and the source line 10 and the pixel electrode 18 become conductive, and the pixel electrode 18 Is equal to the source voltage. At timing t6, the gate voltage is lowered to turn off the TFT 14 switch.

ＴＦＴ１４のオフ期間におけるゲート電圧値は、液晶容量および補助容量２０からの電流のリークを防止するために、ソース電圧およびドレイン電圧より所定の閾値ＶOFF以上低い電圧とする必要がある。 The gate voltage value in the off period of the TFT 14 needs to be lower than the source voltage and the drain voltage by a predetermined threshold V OFF or more in order to prevent leakage of current from the liquid crystal capacitor and the auxiliary capacitor 20.

本実施の形態の液晶表示装置は、画素電圧（ドレイン電圧）を正極性信号電圧から負極性信号電圧に切り替える際、ＴＦＴ１４にゲート電圧を印加する直前のタイミングｔ４に、補助容量電圧を高レベルから低レベルに切り替える。ＴＦＴ１４のゲートのオン、オフを行った後のオフ期間に補助容量電圧を高レベルから低レベルに切り替えると、その分だけドレイン電圧が低下するが（図３に示すΔＶP2）、本実施の形態では、ＴＦＴ１４をオンする前に補助容量電圧を高レベルから低レベルに切り替えているので、負極性期間におけるドレイン電圧を高く保つことができる。これにより、スイッチオフ時におけるゲート電圧を従来より高く保持することができるので、ゲート電圧の振幅を小さくすることができる。従って、電源電圧を小さくし、消費電力を低減させることができる。 In the liquid crystal display device according to the present embodiment, when the pixel voltage (drain voltage) is switched from the positive signal voltage to the negative signal voltage, the auxiliary capacitance voltage is changed from a high level at timing t4 immediately before the gate voltage is applied to the TFT. Switch to low level. When the auxiliary capacitance voltage is switched from the high level to the low level during the off period after the gate of the TFT 14 is turned on and off, the drain voltage decreases by that amount (ΔV P2 shown in FIG. 3). Then, since the auxiliary capacitance voltage is switched from the high level to the low level before the TFT 14 is turned on, the drain voltage in the negative polarity period can be kept high. As a result, the gate voltage at the time of switch-off can be kept higher than in the prior art, so that the amplitude of the gate voltage can be reduced. Therefore, the power supply voltage can be reduced and the power consumption can be reduced.

以上説明したように、本発明によれば、ゲート電圧の振幅を小さくすることができ、低消費電力化を図ることができるという効果を有し、アクティブマトリックス型液晶表示素子の駆動方法として有用である。   As described above, according to the present invention, the amplitude of the gate voltage can be reduced and the power consumption can be reduced, which is useful as a driving method for an active matrix liquid crystal display element. is there.

本実施の形態の液晶表示装置の等価回路を示す図である。It is a figure which shows the equivalent circuit of the liquid crystal display device of this Embodiment. 本実施の形態の液晶表示装置の駆動時の信号波形を示す図である。It is a figure which shows the signal waveform at the time of the drive of the liquid crystal display device of this Embodiment. 従来の液晶表示装置の駆動時の信号波形を示す図である。It is a figure which shows the signal waveform at the time of the drive of the conventional liquid crystal display device.

符号の説明Explanation of symbols

１０ ソースライン
１２ ゲートライン
１４ ＴＦＴ
１６ 液晶素子
１８ 画素電極
２０ 補助容量
２２ 共通電極 10 Source line 12 Gate line 14 TFT
16 Liquid crystal element 18 Pixel electrode 20 Auxiliary capacitor 22 Common electrode

Claims (2)

スイッチ素子と、画素電極と、前記画素電極を一方の電極として用いる補助容量とを備えた液晶表示素子の駆動方法であって、
前記補助容量の他方の電極に、前記画素電極の電圧を負極性信号電圧から正極性信号電圧に切り替えた直後に低レベルから高レベルに変化し、正極性信号電圧から負極性信号電圧に切り替えるために前記スイッチ素子をオンする直前に高レベルから低レベルに変化する電圧を印加する液晶表示素子の駆動方法。 A driving method of a liquid crystal display element comprising a switch element, a pixel electrode, and an auxiliary capacitor using the pixel electrode as one electrode,
Immediately after switching the voltage of the pixel electrode to the other electrode of the auxiliary capacitor from the negative signal voltage to the positive signal voltage, to change from the low level to the high level and to switch from the positive signal voltage to the negative signal voltage. A method for driving a liquid crystal display element, wherein a voltage changing from a high level to a low level is applied immediately before the switch element is turned on. スイッチ素子と、
画素電極と、
前記画素電極を一方の電極として用いる補助容量と、を備え、
前記補助容量の他方の電極に、前記画素電極の電圧を負極性信号電圧から正極性信号電圧に切り替えた直後に低レベルから高レベルに変化し、正極性信号電圧から負極性信号電圧に切り替えるために前記スイッチ素子をオンする直前に高レベルから低レベルに変化する電圧を印加する液晶表示装置。 A switch element;
A pixel electrode;
An auxiliary capacitor using the pixel electrode as one electrode,
Immediately after switching the voltage of the pixel electrode to the other electrode of the auxiliary capacitor from the negative signal voltage to the positive signal voltage, to change from the low level to the high level and to switch from the positive signal voltage to the negative signal voltage. A liquid crystal display device that applies a voltage changing from a high level to a low level immediately before turning on the switch element.
JP2007022739A 2007-02-01 2007-02-01 Method for driving liquid crystal display element and liquid crystal display device Expired - Fee Related JP4249785B2 (en)

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JP2007022739A JP4249785B2 (en) 2007-02-01 2007-02-01 Method for driving liquid crystal display element and liquid crystal display device
TW97103919A TWI374433B (en) 2007-02-01 2008-02-01 Liquid crystal display and driving method thereof
CN2008100071374A CN101236734B (en) 2007-02-01 2008-02-01 Driving method for liquid crystal display device and liquid crystal display device

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JP2007022739A JP4249785B2 (en) 2007-02-01 2007-02-01 Method for driving liquid crystal display element and liquid crystal display device

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JP2010097023A (en) * 2008-10-17 2010-04-30 Epson Imaging Devices Corp Electro-optical device and driving circuit

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CN104517583A (en) * 2015-01-15 2015-04-15 京东方科技集团股份有限公司 Display panel, driving method thereof and display device
CN109712556A (en) * 2019-03-11 2019-05-03 京东方科技集团股份有限公司 Display drive control circuit and control method

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JP3832240B2 (en) * 2000-12-22 2006-10-11 セイコーエプソン株式会社 Driving method of liquid crystal display device
JP3899817B2 (en) * 2000-12-28 2007-03-28 セイコーエプソン株式会社 Liquid crystal display device and electronic device
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JP2010097023A (en) * 2008-10-17 2010-04-30 Epson Imaging Devices Corp Electro-optical device and driving circuit
US8669975B2 (en) 2008-10-17 2014-03-11 Japan Display West Inc. Electro-optical device and driving circuit

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