Sipix Technology, Inc.

E Ink California, LLC

E Ink Corporation

Sipix Imaging, Inc.

Feng-Shou Lin

Craig Lin

Wen-Pin Chiu

Chih-Yu Cheng

Ping-Yueh Cheng

Ning-Wei Jan

Chen-Kai Chiu

Chun-An Wei

Bryan K Chan

Tin Quang Pham

Chen-Hai Tsai

The present invention provides improved driving methods for four particle electrophoretic displays that improves the performance of such displays when they are deployed in low temperature environments and the displays are required to be updated when positioned vertically (i.e., the driving electric fields are substantially perpendicular to the direction of Earth's gravity). Methods are provided for displaying each of the colors at each pixel, as desired, with minimal interference (contamination) from the other particles.

Disaggregation driving sequences for four particle electrophoretic displays

The present invention provides four-particle electrophoretic displays with improved driving methods to achieve better color separation between adjacent pixel electrodes. The driving methods improve the color state performance when a first pixel is displaying a mixed state of a first highly-charged particle and a second lower-charged particle of the opposite polarity, while a neighboring pixel is displaying a state of a second highly-charged particle having the opposite polarity to the first highly-charged particle. The particles can be, for example, all reflective or one type of particle can be partially light transmissive.

Four-particle electrophoretic displays with synchronized driving waveforms

Methods for driving an electrophoretic medium including two pairs of oppositely charged particles. The first pair including a first type of positive particles and a first type of negative particles and the second pair consists of a second type of positive particles and a second type of negative particles, wherein the first pair of particles and the second pair of particles have different charge magnitudes (identifiable as zeta potentials). In particular, the driving methods produce cleaner optical stakes of the lesser-charged particles with less contamination from the other particles and more consistent electro-optical performance when the intermediate driving voltages are modified.

Methods for achieving color states of lesser-charged particles in electrophoretic medium including at least four types of particles

The present invention provides improved driving methods for four particle electrophoretic displays. The driving methods improve the color state performance when a first pixel is displaying a mixed state of a first highly-charged particle and a second lower-charged particle of the opposite polarity, while a neighboring pixel is displaying a state of a second highly-charged particle having the opposite polarity to the first highly-charged particle. The particles can be, for example, all reflective or one type of particle can be partially light transmissive.

Synchronized driving waveforms for four-particle electrophoretic displays

A driving method for an electro-phoretic display apparatus is disclosed. The method includes generating a common voltage by a common voltage generator held at a first voltage level before a polarity transfer, generating the common voltage held at a second voltage level when the polarity transfer starts during a first timing period, and generating the common voltage transfers held at a third voltage level during a second timing period after the first timing period, in which the second voltage level is between the first and the third voltageE levels.

Electro-phoretic display apparatus and driving method thereof

A driving method of a passive displayed panel and a display apparatus are provided. The passive display panel includes a plurality of pixels arranged into an array. The driving method includes following steps. Whether to display a first color frame or a second color frame on the passive display panel is determined according to a display frame. Whether to display a first color at each row or each column of the pixels of the passive display panel is determined according to the display frame. Whether to display a second color at each row or each column of the pixels of the passive display panel is determined according to the display frame. The first color or the second color is displayed column by column or row by row on the passive display panel at those portions of the display frame that do not display the first color or the second color.

Driving method of passive display panel and display apparatus

A multiplex electrophoretic display driver circuit comprises a memory unit, a display controller and a voltage driving unit. The memory unit has two registers respectively storing the current and former gray-level matrix signals. The gray-level matrix signal contains gray-level data corresponding to electrophoretic pixels. The display controller has an encoding circuit and a counting circuit. The encoding circuit generates a difference-value matrix signal containing difference values according to a difference between the current and former gray-level matrix signals and then generates a voltage-difference matrix signal containing voltage-difference signals corresponding to the electrophoretic pixels. The counting circuit receives the difference-value matrix signal and counts to generate refreshing values corresponding to the difference values. The encoding circuit adds the refreshing values to a next-cycled difference-value matrix signal to generate a new voltage-difference matrix signal. The voltage driving unit drives the electrophoretic pixels according to the voltage-difference matrix signal.

Multiplex electrophoretic display driver circuit

This application is directed to driving methods for electrophoretic displays. More specifically, the methods are suitable where there is a requirement for a partial update of the images in the display, where a partial update means that less than 10% of the pixels require updating. An essential element of the method is a floating common electrode. This method for partial updating may be used with the prior art driving techniques in order to provide the optimum updating method for different applications.

Partial update driving methods for electrophoretic displays

An electro-phoretic display apparatus is disclosed. The electro-phoretic display apparatus mentioned above includes a plurality of pixel unit lines, a plurality of common voltage transferring lines, and a common voltage generator. The common voltage transferring lines extend and connect to a common line segment directly along a layout direction. The common voltage generator generates a common voltage and provides the common voltage for directly electrically connecting to a connection point on the common line segment. Moreover, the transfer timing delays of transferring the common voltage from the connection point to the first common voltage transferring line and the last common voltage transferring line are the same.

Electro-phoretic display apparatus

A frequency conversion correction circuit for an electrophoretic display (EPD) which has a control circuit to capture pixel signals of a next picture and gets a corresponding update signal from a look up table to be output, and a driving circuit to provide a plurality set of potential difference signals corresponding to a plurality set of electrodes of an EPD panel according to the update signal. The EPD further has an environment detection device and a duty frequency judgment unit. The environment detection device detects the operation environments of the EPD and gets an environment parameter. The duty frequency judgment unit compares the preset signal value sections where the environment parameter is located and generates a duty frequency signal and sends to the driving circuit. The driving circuit changes and outputs the frequency of the potential difference signals in a fixed frame time according to the duty frequency signal.

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Tainan, Taiwan

Feng-Shou Lin