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Electrophoretic display device and driving method

A technology for display devices and display components, applied to static indicators, instruments, etc., can solve problems such as inaccurate gray scale reproduction

Inactive Publication Date: 2006-06-21
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The disadvantage of this display is the effect of slow drive, which leads to inaccurate gray scale reproduction

Method used

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  • Electrophoretic display device and driving method
  • Electrophoretic display device and driving method
  • Electrophoretic display device and driving method

Examples

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Embodiment Construction

[0050] figure 1 Schematic representation of a cross-sectional view of a part of an electrophoretic display device 1 of eg several display element sizes, comprising a base substrate 2, an electrophoretic film with electronic ink, such as polyethylene, present between two transparent substrates 3, 4, the substrate One 3 is provided with a transparent image electrode 5 and the other substrate 4 is provided with a transparent counter electrode 6 . Electronic ink comprises a plurality of microcapsules 7 of about 10-50 microns. Each microcapsule 7 comprises positively charged white particles 8 and negatively charged black particles 9 suspended in a fluid F. When a positive electric field is applied to the pixel electrode 5, the white particles 8 move to the side of the microcapsule 7 directed to the counter electrode 6, and the display element can be seen by a viewer. At the same time, the black particles 9 move towards the opposite side of the microcapsules 7, where they are invi...

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PUM

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Abstract

A display device (1) comprises: two or more sets of display elements with electrophoretic particles (8, 9), a pixel electrode (5) and a counter electrode (6). A drive signal (50, (V, t) drive, (V, t) reset) is supplied to the electrodes to place the display element in a predetermined optical state. The drive signal precedes the preset signal (53, (V, t) preset), thereby releasing the electrophoretic particles, but is so low in intensity that the particles do not significantly change their optical state. The preset signals fed to each group represent the phase difference. This reduces flickering. In operation, the preset and drive signals are provided such that for the drive pulses the phase of the preset pulse preceding the drive pulse is substantially the same for all groups. The combination of drive pulses and preceding preset pulses is then the same for all groups, which reduces gray level variation.

Description

technical field [0001] The present invention relates to a display device comprising: electrophoretic particles; a display element comprising a pixel electrode and a counter electrode between which a part of the electrophoretic particles are present; and a control device for A drive signal is applied to the electrodes to place the display element in a predetermined optical state. [0002] Display devices of this type are used, for example, in monitors, laptop computers, Personal Digital Assistants (PDA's), mobile phones and electronic books, electronic newspapers and electronic magazines. Background technique [0003] A display device of the type mentioned in the opening paragraph is known from the international patent application WO 99 / 53373. This patent application discloses an electronic ink display comprising two substrates, one of which is transparent and the other substrate is provided with electrodes arranged in rows and columns. The intersections between the row and...

Claims

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Application Information

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IPC IPC(8): G09G3/34
CPCG09G3/344G09G2300/08G09G2310/0262G09G2310/06G09G2310/061G09G2310/068G09G2320/0247
Inventor G·周M·T·约翰逊N·艾勒内
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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