EP2099020A2 - Verfahren und Vorrichtung zur Steuerung einer digitalen elektrophoretischen Anzeigetafel - Google Patents

Verfahren und Vorrichtung zur Steuerung einer digitalen elektrophoretischen Anzeigetafel Download PDF

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Publication number
EP2099020A2
EP2099020A2 EP08171951A EP08171951A EP2099020A2 EP 2099020 A2 EP2099020 A2 EP 2099020A2 EP 08171951 A EP08171951 A EP 08171951A EP 08171951 A EP08171951 A EP 08171951A EP 2099020 A2 EP2099020 A2 EP 2099020A2
Authority
EP
European Patent Office
Prior art keywords
panel driving
digital
display panel
electrophoretic display
controller chip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08171951A
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English (en)
French (fr)
Other versions
EP2099020A3 (de
Inventor
Hsin-Chung Chen
Feng-Chuan Yeh
Po-Sen Chen
Rui-Yang Lai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Prime View International Co Ltd
Original Assignee
Prime View International Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Prime View International Co Ltd filed Critical Prime View International Co Ltd
Publication of EP2099020A2 publication Critical patent/EP2099020A2/de
Publication of EP2099020A3 publication Critical patent/EP2099020A3/de
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
    • G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices

Definitions

  • the present invention relates to a digital electrophoretic display panel driving device and a method thereof, and more particularly, to a driving device and a method for a electrophoretic display (electronic paper).
  • EPD electrophoretic display
  • electronic paper is made of conductive polymer material comprising many "microspheres" (or microcapsules), which is flexible and capable of displaying data thereon repeatedly.
  • the size of the micro capsules represents the size of the pixels; besides, micro capsules are tended to change their states as driven by an external voltage.
  • the US patent publication No.20060050050 discloses a electronic ink display whose conductivity is tended to change as driven by an external voltage, therefore the material of the electronic ink display must be conductive; meanwhile, the electronic ink display uses polymer material to provide flexibility and can be bent like papers.
  • the EPD (electronic paper) is advantageous in that its brightness is three to six times of that of reflective color LCD for people to easily read it in the dark or under direct sunlight; the contrast of the EPD is higher than the newspaper with no limitation in its viewing angle.
  • the EPD is able to display content even after the power is off, which means the battery life of the portable device can be extended; the power consumption of the EPD is only 1/1000 as compared to the display of notebook computer as it doesn't require backlight.
  • the EPD displays contents as they are printed on the paper, therefore the reader will not get tired easily as compared with reading contents from the LCD display; besides, the EPD is thinner and lighter than the common LCD display.
  • EPD electronic paper
  • Gyricon Polyethylene spheres between 20 and 100 micrometres across. Each sphere is composed of negatively charged black plastic on one side and positively charged white plastic on the other. The polarity of the voltage applied to each pair of electrodes then determines whether the white or black side is face-up, thus giving the pixel a white or black appearance
  • microcapsules each contains positively charged white particles and negatively charged black particles (E ink) suspended in a clear fluid.
  • E ink negatively charged black particles
  • the white particles move to the top of the microcapsule where they become visible to the user. This makes the surface appear white at that spot.
  • an opposite electric field pulls the black particles to the bottom of the microcapsules where they are hidden. By reversing this process, the black particles appear at the top of the capsule, which now makes the surface appear dark at that spot.
  • one microcapsule can display two different colors.
  • These microcapsules are suspended in a liquid "carrier medium” allowing them to be printed onto virtually any surface, including glass, plastic, fabric and even paper.
  • EPD electronic paper
  • electro paper Since the EPD (electronic paper) is highly portable, reusable, fast to update, low cost and even provides hand written input, therefore the emerging electronic paper will bring revolution to the publishing industry. People can carry electronic papers along to update news or information at any time, any place, and to modify documents as desired. More importantly, electronic papers help to conserve the environment and reduce consumption of papers (the annual consumption is over 200 million tons) to maintain ecological balance.
  • EPD changes the traditional media.
  • Japanese government announced that it intended to transmit news digitally to every user's computer for users browse the contents using specific software and to even download the contents to their electronic papers via wireless network.
  • Forrester Research said that electronic paper stands a chance to replace the popular LCD displays and changes the way people read.
  • EPD electronic paper
  • each EPD panel is slightly different due to parameters, material, packaging or environment in the front end process (10), therefore panel suppliers will provide different common electrode voltages (Vcom) (11).
  • Vcom common electrode voltages
  • the back end process for EPD panels (12) is to cut the EPD display panel and to integrate it with other components such as capacitors, driving IC, frame, flexible printed circuit and so on, then in system manufacturing process, the Vcom of the EPD is modified manually by adjusting the variable resistor (13). Then the waveform voltage value is written to the memory in the system board (14).
  • the waveform voltage values are read from the memory in the system board and combined with the Vcom to display contents (18).
  • the buffer circuit (112) is used for outputting voltage to switch input/output terminals.
  • the controller chip is provided for controlling the output of the common electrode voltage switch (114) to the output terminal (115).
  • the prior art technique adjusts the variable resistor manually to change the common electrode voltage (Vcom), which could lead to long adjustment time and huge labor; besides, there could be misadjustment or manual error problems.
  • Vcom common electrode voltage
  • the present invention provides a digital electrophoretic display panel driving method and apparatus.
  • the new method reads the setup value digitally from the memory without manual adjustment to save time and labor and to reduce the voltage error of the common electrode voltage (Vcom), since the digital voltage error is less than the voltage error adjusted by the variable resistor.
  • Vcom common electrode voltage
  • the prior art EPD is driven by adjusting the variable resistor.
  • the Vcom setup value of the system board should match that of the panel, therefore it could lead to long time wasted in searching for suitable panels.
  • the present invention reads the Vcom from the memory in the panel, it is convenient for the maintenance worker or the tester since they don't need to find matched panels or to re-adjust the variable resistor.
  • the present invention provides a digital electrophoretic display panel driving method and apparatus to use a memory to store common electrode voltage (Vcom) setup value and the panel driving data; the present digitally reads the setup value from the memory without manual adjustment to save time/labor and to avoid manual error.
  • the digital electrophoretic display (EPD) panel driving device comprises a panel driving memory disposed on the EPD for storing digital panel driving data, and a connecting circuit for a controller chip to read the data in the panel driving memory via the connecting circuit.
  • a flexible printed circuit (23) of the electrophoretic display panel (2) is mainly added with a panel driving memory (24) thereon, and the NC pin of the flexible printed circuit tail (26) is added with a memory IC (25) connecting with a controller chip (61).
  • FIG.2B Please refer to the embodiment of FIG.2B , wherein a glass of the electrophoretic display panel (2) is mainly added with the panel driving memory (24) thereon, and the NC pin of the flexible printed circuit tail (26) is added with a memory IC (25) connecting with the controller chip (61).
  • each EPD panel is slightly different due to parameters, material, packaging or environment in the front end process, therefore it is necessary to use different common electrode voltages (Vcom) in driving different EPD panels.
  • the back end process for EPD panels is to cut the EPD display panel and to integrate it with other components such as capacitors, driving IC, frame, flexible printed circuit and so on, then in system manufacturing process, the Vcom of the EPD is modified manually by adjusting the variable resistor.
  • the present invention provides a digital electrophoretic display panel driving method and apparatus to store different common electrode voltages (Vcom) of EPD panels in memory; besides, the memory can be used for storing driving voltage waveform value. As illustrated by Taiwan patent application No.
  • the present invention discloses a plurality of sub pixels aligned in a matrix, wherein a single or a plurality of pixels are sequentially driven.
  • the invention obtains a grey level value for each pixel and sequentially drives the pixels.
  • First apply driving voltages to convert all pixels into one of the two predefined grey level values.
  • adjust the total driving time of each grey level value to increase or reduce the driving time for each grey level value respectively, in doing this, it is useful to control the display of each grey level value.
  • the driving time or the driving voltage data can be stored on the memory of the EPD panel.
  • a power supply (34) provides power to a microcontroller(MCU)(33), the controller chip (31) reads the data from the panel driving memory (24) via the FPC tail (26) and the flexible printed circuit connecting terminal (27), and the controller chip (31) uses the panel power module (32) to provide power to the electrophoretic display panel (2) on the panel module (62). After the data is read, it is converted by the controller chip into an analog voltage signal for the driving chip (21) to drive the EPD.
  • FIG.4 for a flowchart of a method for driving the EPD panel.
  • each EPD panel is slightly different due to parameters, material, packaging or environment in the front end process (40), therefore it is necessary to use different common electrode voltages (Vcom) (41) provided by the panel supplier to drive different EPD panels and to store digital driving data and the Vcom in the driving memory.
  • Vcom common electrode voltages
  • the back end process (42) for EPD panels is to cut the EPD display panel and to integrate it with other components such as capacitors, driving IC, frame, flexible printed circuit and so on, then the EPD is driven according to the following steps:
  • controller chip (51) uses a digital/analog converter (52) in the controller chip to convert the digital panel driving data read from the panel driving memory into an analog voltage signal and to control the common electrode voltage switch (54) to send the analog voltage signal from the voltage inverter (53) via an output terminal (55) to the driving integrated circuit on the display panel.
  • a digital/analog converter (52) in the controller chip to convert the digital panel driving data read from the panel driving memory into an analog voltage signal and to control the common electrode voltage switch (54) to send the analog voltage signal from the voltage inverter (53) via an output terminal (55) to the driving integrated circuit on the display panel.
  • controller chip (113) uses the common electrode voltage generator (116) in the controller chip (113) to send the digital panel driving data in the panel driving memory to the common electrode voltage switch (114) for outputting a common electrode voltage via an output terminal (115) to the driving integrated circuit on the display panel.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
EP08171951A 2008-03-03 2008-12-17 Verfahren und Vorrichtung zur Steuerung einer digitalen elektrophoretischen Anzeigetafel Withdrawn EP2099020A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200810081647 2008-03-03
CN200810148843.0A CN101527117B (zh) 2008-03-03 2008-09-27 数字式电泳显示器面板驱动装置及方法

Publications (2)

Publication Number Publication Date
EP2099020A2 true EP2099020A2 (de) 2009-09-09
EP2099020A3 EP2099020A3 (de) 2010-05-05

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Application Number Title Priority Date Filing Date
EP08171951A Withdrawn EP2099020A3 (de) 2008-03-03 2008-12-17 Verfahren und Vorrichtung zur Steuerung einer digitalen elektrophoretischen Anzeigetafel

Country Status (2)

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EP (1) EP2099020A3 (de)
CN (1) CN101527117B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102479441A (zh) * 2010-11-23 2012-05-30 汉王科技股份有限公司 电子阅读器和控制电子纸屏vcom电压的方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050041004A1 (en) * 2003-08-19 2005-02-24 E Ink Corporation Method for controlling electro-optic display
US20060050050A1 (en) 2003-01-23 2006-03-09 Guofu Zhou Driving a bi-stable matrix display device
US20060209055A1 (en) * 2003-04-23 2006-09-21 Naohide Wakita Driver circuit and display device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI234134B (en) * 2000-04-14 2005-06-11 Koninkl Philips Electronics Nv Display driver with double calibration means
AU2002366174A1 (en) * 2001-11-20 2003-06-10 E Ink Corporation Methods for driving bistable electro-optic displays
US7528822B2 (en) * 2001-11-20 2009-05-05 E Ink Corporation Methods for driving electro-optic displays
KR20060088882A (ko) * 2003-09-29 2006-08-07 코닌클리케 필립스 일렉트로닉스 엔.브이. 정확한 그레이스케일과 자연스러운 이미지 업데이트를 가진쌍안정 디스플레이

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060050050A1 (en) 2003-01-23 2006-03-09 Guofu Zhou Driving a bi-stable matrix display device
US20060209055A1 (en) * 2003-04-23 2006-09-21 Naohide Wakita Driver circuit and display device
US20050041004A1 (en) * 2003-08-19 2005-02-24 E Ink Corporation Method for controlling electro-optic display

Also Published As

Publication number Publication date
CN101527117A (zh) 2009-09-09
CN101527117B (zh) 2014-02-19
EP2099020A3 (de) 2010-05-05

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