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Driving method of electrooptical device, electrooptical device and electronic equipment

A technology of electro-optical device and driving method, applied in optics, nonlinear optics, static indicator, etc., and can solve problems such as non-uniformity

Active Publication Date: 2004-10-20
138 EAST LCD ADVANCEMENTS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is also because each pixel in the holding period after the data signal (positive polarity voltage Vx) is written into each pixel in the first field 1F until the negative polarity voltage -Vx is applied in the second field 2F is The voltage fluctuation of the electrodes is greatly different in the vertical direction of the liquid crystal display panel.

Method used

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  • Driving method of electrooptical device, electrooptical device and electronic equipment
  • Driving method of electrooptical device, electrooptical device and electronic equipment
  • Driving method of electrooptical device, electrooptical device and electronic equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] according to Figure 1 to Figure 7 The liquid crystal display device of Example 1 will be described.

[0081] figure 1 A driving method of the liquid crystal display device of Embodiment 1 is shown, figure 2 The V-T characteristics (voltage-transmittance characteristics) of liquid crystals used in this liquid crystal display device are shown. also, image 3 The electrical configuration of the drive circuit of the liquid crystal display device is schematically shown, Figure 4 A part of an electrical equivalent circuit of a liquid crystal display panel is shown.

[0082] The liquid crystal display device of Example 1 is a three-terminal active matrix liquid crystal display device using a three-terminal switching element such as a thin film transistor (TFT), and its display mode is a normally white mode (normally white mode). In addition, in this liquid crystal display device, frame inversion is performed in which a positive polarity data signal and a negative polar...

Embodiment 2

[0111] Figure 8 A method of driving a liquid crystal display device according to Embodiment 2 of the present invention is shown. In the case of frame inversion driving of this liquid crystal display device, only the above-mentioned non-data signal 12 or 14 is displayed in black, which is different from the frame inversion driving of the first embodiment described above. That is, the time for writing and holding the non-data signal 12 or 14 in the second subfield SF2 is half the time for writing and holding the data signal 11 or 13 in the first subfield SF1.

[0112] Therefore, in this embodiment, from the end time of the first subfield SF1 of each frame to the period 1 / 2T of the half period T of the second subfield SF2, all signal lines X1 to Xn are supplied with The voltages of the above-mentioned non-data signals 12 and 14 required for black display. Then, at the time after the 1 / 2T period has elapsed from the end time of the first subfield SF1, connection is made to one...

Embodiment 3

[0116] Figure 9 A method of driving a liquid crystal display device according to Embodiment 3 of the present invention is shown. In the frame inversion driving of the liquid crystal display device, only one frame for writing the non-data signals 12 and 14 is provided between two frames for writing the data signals 11 and 13 with different polarities. , which is different from the frame inversion driving in the first embodiment described above. That is, the period during which each data is written in the order of the non-data signal 11, the non-data signal 12, the data signal 13, and the non-data signal 14 becomes one frame with the same time length.

[0117] According to Example 3 thus constituted, in addition to the above-mentioned effects (1) to (4), the following effects can be obtained.

[0118] (6) It is possible to obtain a sufficient timing for writing data signals while facilitating the timing control of writing data signals 11, 13 and non-data signals 12, 14 respec...

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Abstract

The invention provides a driving method for an electro-optical apparatus, the electro-optical apparatus, and electronic equipment in which unevenness of luminance in the vertical direction can be controlled. A data signal is written to pixels in a first sub field SF1 and a non-data signal, having the same polarity as the data signal, and of the maximum voltage is written to the pixels in a second sub field SF2 in each frame. When proceeding from SF1 to SF2, variations in potential applied to each signal line can be decreased, and the amount of leakage of each pixel electrode potential is reduced. After having obtained a black display (in the case of a normally white mode) by writing the non-data signal, a data signal having the opposite polarity from the data signal in the previous frame is written to the pixels. Since a black display is in the stable area of a V-T curve of the liquid crystal, and variations in transmittance ratio can be small even when the voltage is varied to some extent, variations in transmittance rate of the liquid crystal at the each pixel, that is, unevenness of luminance when proceeding from the SF2 to the subsequent frame SF1 is small.

Description

technical field [0001] The present invention relates to a driving method of an electro-optic device, an electro-optic device and electronic equipment. Background technique [0002] As a conventional electro-optical device, it is known that it is an active matrix liquid crystal display device in which thin-film transistors are respectively provided in a plurality of pixels arranged in a matrix, and it is made so that each pixel is connected via a liquid crystal to each other in each field. A liquid crystal display device in which the potential of the common line opposite to the pixel electrode is reversed (for example, refer to Patent Document 1 Figure 4 ). In this liquid crystal display device, a video signal of positive polarity and a video signal of negative polarity are alternately written in each pixel every field by inverting the potential of the common line every field. signal, so as to AC drive the liquid crystal. Accordingly, the amplitude of data signals such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G09G3/20G09G3/36
CPCG09G2320/0209G09G2310/06G09G2300/088G09G3/3614G09G3/3648G02F1/133
Inventor 保坂宏行
Owner 138 EAST LCD ADVANCEMENTS LTD