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Drive method for an electrophoretic display device and an electrophoretic display device

A technology of electrophoretic display and driving method, which is applied in static indicators, nonlinear optics, instruments, etc., and can solve problems such as low reflectivity, inability to move particles, unevenness, and afterimages

Active Publication Date: 2011-05-18
E INK CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] As a countermeasure, flicker can be prevented when a short pulse, for example, a pulse signal with a pulse width of 20 milliseconds is input for sharing, but there is a problem that the particles cannot be moved to a sufficient saturation because the pulse width of the applied voltage is short. , only slightly lower reflectivity can be obtained
[0009] Also, when a pulse signal with a short pulse width is used, sufficient reflectivity cannot be obtained by one write
Therefore, for example, in an electrophoretic display device using white and black electrophoretic particles, the reflectivity of pixels rewritten from white display to white display is different from that of pixels rewritten from black display to white display, resulting in a distorted image. Issues such as unevenness and afterimages

Method used

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  • Drive method for an electrophoretic display device and an electrophoretic display device
  • Drive method for an electrophoretic display device and an electrophoretic display device
  • Drive method for an electrophoretic display device and an electrophoretic display device

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no. 1 approach

[0070] refer to Figure 1 ~ Figure 1 1 The first embodiment of the present invention will be described.

[0071] [1. Overall structure]

[0072] figure 1 It is a front view of the electronic timepiece 1 using the electrophoretic display device of this embodiment. The electronic timepiece 1 includes a rectangular ring-shaped casing 2 and an electrophoretic display device 3 . In addition, a crown 5 and buttons 6 and 7 are provided on the case 2 .

[0073] [2. Structure of electrophoretic display device]

[0074] As shown in FIG. 2 , the electrophoretic display device 3 includes a display panel 30 and a drive control unit 40 that drives the display panel 30 and has a timer.

[0075] [3. Structure of drive control unit]

[0076] The drive control unit 40 includes a power source 41 , a controller 42 that controls the entire timepiece 1 , a drive circuit 43 , a detection circuit 44 , and a timekeeping section 45 .

[0077] The drive circuit 43 is constituted by a driver IC to...

no. 2 approach

[0155] Next, a timepiece according to a second embodiment of the present invention will be described.

[0156] As shown in FIG. 12 , the timepiece of the second embodiment differs from the first embodiment in that the number of drive pulses of the controller 42 , especially the input number of the second pulses in the second pulse application step S22 is different. The rest of the structure is the same as that of the above-mentioned first embodiment, so description thereof will be omitted.

[0157] That is, when the controller 42 performs update control of the display, based on the above-mentioned first embodiment, Figure 7 , 8 control flow chart.

[0158] Here, in the first pulse applying step S21 , as shown in FIG. 12 , the controller 42 (first pulse applying unit 423 ) performs the same control as that in the first embodiment. That is, the first pulse is applied to the common electrode 32 , the H level signal is applied to the pixel A performing white display, and the L...

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Abstract

A drive method for an electrophoretic display device that has an electrophoretic device composed of a suspension fluid containing electrophoretic particles disposed between a common electrode and a plurality of pixel electrodes, a drive means that drives the electrophoretic device by applying voltage between the common electrode and the plural pixel electrodes, and a control means that controls the drive means. The control method has a display redrawing process that changes the displayed image by applying a common electrode drive pulse that repeats two different potentials to the common electrode, and applying either of the two different potentials to the pixel electrodes according to the updated display content. The display redrawing process includes a first pulse application step that applies a first pulse to the common electrode as the common electrode drive pulse, and a second pulse application step that executes after the first pulse application step and applies a second pulse with a pulse width longer than the first pulse to the common electrode as the common electrode drive pulse.

Description

technical field [0001] The present invention relates to a driving method of an electrophoretic display device and the electrophoretic display device. Background technique [0002] There is known a phenomenon (electrophoretic phenomenon) in which electrophoretic particles migrate due to Coulomb force when an electric field is applied to a dispersion liquid in which electrophoretic particles are dispersed in a solution, and an electrophoretic display device utilizing this phenomenon has been developed. However, there is still much room for improvement in the image quality of the existing electrophoretic display devices. [0003] For example, as a typical driving method of a liquid crystal display and other displays, a method of varying the potential of a pixel electrode and also varying the potential of a common electrode (generally referred to as sharing) is known. This shared driving method has also been proposed for electrophoretic display devices (see Patent Document 1). ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/20G09G3/34G02F1/167
Inventor 井上胜豊
Owner E INK CORPORATION
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