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Electrooptical device and driving method thereof, and projection display device and electronic equipment

A technology of electro-optical device and driving method, which can be applied to televisions, electrical components, color televisions, etc., and can solve problems such as uneven brightness.

Inactive Publication Date: 2005-02-09
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the pixels on the lower side of the screen gradually become larger due to the voltage value leaked by the off-resistance of the switching element, and the brightness of the display on the upper and lower sides of the screen becomes uneven.

Method used

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  • Electrooptical device and driving method thereof, and projection display device and electronic equipment
  • Electrooptical device and driving method thereof, and projection display device and electronic equipment
  • Electrooptical device and driving method thereof, and projection display device and electronic equipment

Examples

Experimental program
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Embodiment 1

[0043] Below, refer to Figure 1-Figure 10 Example 1 of the present invention will be described.

[0044] In this embodiment, a light modulation device as a projection display device among the electro-optical devices will be described by taking a liquid crystal light valve (liquid crystal device) as an example.

[0045] figure 1 It is a schematic configuration diagram of the liquid crystal light valve of this embodiment. figure 2 Is along figure 1 The cross-section of the H-H’ line, image 3 It is an equivalent circuit diagram of a plurality of pixels formed in a matrix forming a liquid crystal light valve, Figure 4 Is the block diagram including the drive circuit section, Figure 5 It is a circuit diagram showing the structure of the scan driver in the drive circuit section, Figure 6 Yes Figure 5 Detailed circuit diagrams of the main parts in Figure 7 It is a timing chart to illustrate the operation of the liquid crystal light valve, Figure 8 Is to take out Figure 7 The...

Embodiment 2

[0065] Below, refer to Figure 12-14 The second embodiment of the present invention will be described.

[0066] The basic structure of the liquid crystal light valve (liquid crystal device) of this embodiment is basically the same as that of Embodiment 1, except that the output interval of the gate output pulse can be variably controlled.

[0067] As described above, in the present invention, since the data for image display and the data for black display are written alternately in one vertical scanning period, the image display area and the black display area always exist in the screen. The image of the field written before (for example, the field for black display) is sequentially overwritten by the image of the field written after that (for example, the field for image display). For example, after the writing of the black field starts, the writing of the image field starts when the k-th line is scanned (that is, after the 2k horizontal scanning period has elapsed), and the black...

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Abstract

To raise the visibility of moving pictures while obtaining the uniformity of display quality level in a screen by suppressing crosstalk. The driving circuit part of an electro-optical device divides data of one frame into a plurality of data corresponding to a plurality of fields. The data of two continuous fields is alternately written in every one horizontal period while changing the start time of writing of each field within one vertical period. At this time, one of data of the two continuous fields is made image data and the other is made black display data. Then, the polarity of data signal is inverted in fields against predetermined electric potential between the continuous fields while changing the start time of the writing of each field within one vertical period. As a result, the image display region and the black display region are simultaneously formed and then a pseudo impulse-type display can be performed. Further, the occurrence of disclination can be avoided because the pseudo field-inversion driving is performed in every region. On the other hand, a crosstalk can be avoided because a line-inversion driving can be performed for the data line.

Description

Technical field [0001] The present invention relates to an electro-optical device, a driving method thereof, a projection display device, and electronic equipment, and more particularly to a structure of an optimal electro-optical device and a driving method thereof for a liquid crystal light valve mounted on a projection display device. Background technique [0002] In the electro-optical device represented by the liquid crystal display, the smear phenomenon in which the outline of the image is blurred occurs when the moving picture is displayed. This smear phenomenon has been thought to be due to the poor responsiveness of liquid crystals in the past, but in recent years, it has been clarified that this is caused by the Hold type driving method that keeps the image displayed. . That is, the hold-type display device always continues to display the previous image until the image is switched, but since the human eye has the continuity of following motion, it observes while moving ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G09G3/00G09G3/20G09G3/34G09G3/36H04N5/66
CPCG09G3/3648G09G3/3677G09G2320/0209G09G2320/0233G09G3/3614G09G2320/0261
Inventor 保坂宏行
Owner SEIKO EPSON CORP