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Electrophoretic display device and driving method thereof

一种电泳显示、电泳的技术，应用在静态指示器、仪器、非线性光学等方向

Active Publication Date: 2014-03-26
TIANMA MICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as large screens and their high definition are advanced, the required drive capability also becomes greater

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

example 1-1）

[0119] by using Figure 7 Applied to the pixel and Figure 8 The waveform of the voltage applied to the displayed image is shown, describing the driving method when updating the image. The image update period consists of a reset period (T0 to T3) for erasing the previous image and a set period (T3 to T4) for writing an image. Figure 7 (a) shows a waveform of a voltage applied to a pixel to update an image, and then display white (W). Figure 7 (b) shows the waveform of the voltage applied to the pixel to update the image, followed by displaying light gray (LG). Figure 7 (c) shows the waveform of the voltage applied to the pixel to update the image, followed by displaying dark gray (DG). Figure 7 (d) shows the waveform of the voltage applied to the pixel to update the image, followed by displaying black (B).

[0120] Figure 7 with Figure 8 The driving method shown is to set all pixels of the display unit to display black (black ground state) at the end of the reset p...

example 1-2）

[0138] In Driving Example 1-1, each of the voltage pulses applied to the pixel is a pulse that enters the 0V state after the voltage is applied, such as Figure 7 shown. However, with the driving method of the first exemplary embodiment, it is not necessary to be in the 0V state after the voltage is applied for each voltage pulse. Therefore, it is also possible to pass e.g. Figure 13 voltage waveform shown to drive.

[0139] Figure 13 The voltage waveforms shown are omitted Figure 7 (Driving Example 1-1) The voltage waveform of the 0V state between each of the voltage pulses shown. Therefore, if Figure 7 In the case of , during T0 to T1 of the reset period, a negative disturbance pulse 11 with a pulse width pw1 is applied to all pixels. Next, a positive disturbance pulse 10A is applied from T1. However, the disturbance pulse of this driving example is a pulse including the function of the compensation pulse, and its pulse width is different from that of driving exam...

example 1-3）

[0148] Such as Figure 15 with Figure 16 As shown, the driving example is to set all the pixels of the display unit to display white (white ground state) at the end of the reset period, and to change the desired pixel to a low reflectivity by applying a voltage of +V during the set period state-driven method.

[0149] exist Figure 15 In the shown voltage waveforms, after a positive disturbance pulse 10 is applied from T0 to T2 of the reset period, a negative disturbance pulse 11 is applied to all pixels in order to erase the displayed image and disturb the particles. The pulse widths of the positive and negative disturbance pulses are defined as pw1 in common, as in the case of Driving Example 1-1. However, in Figure 15 In the case of the illustrated driving example of the voltage waveform, a negative compensation pulse 21 is applied. That is, it is expected that the time required to change the black display state to the white display state (white ground state) by appl...

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Abstract

The present invention provides an electrophoretic display device and a driving method thereof, wherein an image update period is constituted with a reset period including at least a stirring pulse for stirring electrophoretic particles and a compensation pulse for suppressing accumulation of the residual DC component and with a set period including a set pulse for applying, to intended pixels, a voltage of polarity for making transition to black or white for a prescribed amount of time according to a next image. The voltage waveforms for each display gradation are so designed that a period where a positive voltage is applied to a counter electrode and a period where a negative voltage is applied do not overlap with each other, and a compensation pulse is applied after the stirring pulse which sets all the pixels of the display unit to a white or black base state. Thereby, changes in the display state are not visually recognized.

Description

[0001] Cross References to Related Applications [0002] This application is based on and claims the benefit of priority from Japanese Patent Applications No. 2012-202310 filed on September 14, 2012 and No. 2013-147478 filed on July 16, 2013, the entire contents of which are incorporated herein by reference. technical field [0003] The invention relates to an electrophoretic display device and a driving method thereof. More specifically, the present invention relates to an electrophoretic display device that does not generate afterimages and ghost images, and that does not display an inverted image (negative image or negative film) when an image is updated, and a driving method thereof. Background technique [0004] As a display device capable of "reading" with ease, an electronic paper display device called an electronic book or electronic newspaper is being developed. This type of electronic paper display device is required to be thin, lightweight, difficult to damage, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/167G09G3/34
CPCG02F1/167G09G3/2011G09G2300/0876G09G2310/0254G09G2310/0275G09G2310/06G09G2310/063G09G2320/0204G09G2300/0842G09G3/344
Inventor 佐藤哲史坂本道昭
Owner TIANMA MICRO ELECTRONICS CO LTD
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