Electrophoretic or bi-stable display device and driving method therefor

A bistable display and driver technology, applied to static indicators, instruments, etc., can solve problems such as pixel deterioration

Inactive Publication Date: 2006-08-23
KONINK PHILIPS ELECTRONICS NV
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Problems solved by technology

A non-zero average level on a pixel will degrade the pixel

Method used

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  • Electrophoretic or bi-stable display device and driving method therefor
  • Electrophoretic or bi-stable display device and driving method therefor
  • Electrophoretic or bi-stable display device and driving method therefor

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Embodiment Construction

[0042] The subscripts i, j and k are used to denote specific items that are present or used. For example, pixel Pij refers to any one pixel that may be mentioned, or drive waveform DWk refers to any drive waveform. On the other hand, DW1 refers to a specific driving waveform DWk.

[0043] FIG. 1 shows drive waveforms in order to illustrate an embodiment according to the present invention in which a sequence of sub-pulses is used instead of a single drive pulse.

[0044] In electrophoretic displays it is difficult to reliably generate intermediate levels (eg gray if black and white particles are used in EInk type displays). Typically, the intermediate level is produced by applying a voltage pulse for a specific period of time, thus determined by the energy of the applied pulse. The intermediate level is largely affected by image distortion, dwell time, temperature, humidity, lateral unevenness of the electrophoretic film, etc. For example, in an EInk-type electrophoretic dis...

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Abstract

A drive circuit for a bi-stable display comprises: a driver (101, 102) which supplies drive waveforms (DWk) to the pixels (Pij) of the display during an image update period (IUk) wherein the image presented by the pixels (Pij) is updated. A controller (103) controls the driver (101, 102) to supply, during the image update period (IUk) wherein a particular optical transition of a particular one of the pixels (Pij) is required, an associated one of the drive waveforms (DWk) to the particular one of the pixels (Pij). The associated one of the drive waveforms (DWk) comprises a sequence of a particular number of pulse., (SPk), wherein consecutive ones of the pulses (SPk) of the sequence are separated by a separation period of time (SPT). The particular number of said pulses (SPk), and / or a duration of said pulses (SPk), and / or a duration of the separation period (SPT) of the associated one of the drive waveforms (DWk) is determined to obtain the particular optical transition at a desired energy of the associated one of the drive waveforms (DWk) to decrease an average value of the associated one of the drive waveforms (DWk).

Description

technical field [0001] The present invention relates to a driving circuit for a bistable display, a method of driving a bistable display and a display device comprising a bistable display and such a driving circuit. Background technique [0002] Robert Zhener, Karl Amundson, Ara Knaian, Ben Zion, MarkJohnson, Guofu Zhou in the literature "Drive waveforms for active matrix electrophoretic displays (drive waveforms for active matrix electrophoretic displays)" (SID2003 digest, pages 842-845) Disclosed in: In an electrophoretic display, gray scales can be obtained by modulating the pulse width and / or amplitude of a single drive pulse during each image update period in which the image on the matrix display is refreshed. [0003] Typically, the average level of the voltage of the drive waveform will be non-zero for a particular pixel during a continuous sequence of image update periods. A non-zero average level across a pixel will degrade the pixel. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34G09G3/36G09G3/20
CPCG09G2320/0204G09G2320/0257G09G3/2018G09G2310/06G09G2330/04G09G2300/08G09G2300/0876G09G3/344
Inventor G·周M·T·约翰逊
Owner KONINK PHILIPS ELECTRONICS NV
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