Electrophoretic display panel

• US 7,109,969 B2
• Filed: 05/13/2003
• Issued: 09/19/2006
• Est. Priority Date: 05/24/2002
• Status: Expired due to Term

• Current Assignee: Intertrust Technologies Corporation (Fidelio Acquisition Co LLC)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Johnson, Mark Thomas, Zhou, Guofu
• Primary Examiner(s): Nguyen, Jimmy H.
• Application Number:
  US10/515,464
• Publication Number:
  US 20050162378A1
• Time in Patent Office: 1,225 Days
• Field of Search: 349/86, 349/72, 349/199, 349/107, 359/296, 359/395
• US Class Current: 345/107
• CPC Class Codes: G02F 1/167 by electrophoresis
• CPC Class Codes: G02F 1/1685 Operation of cells; Circuit arrangements affecting the entire cell
• CPC Class Codes: G09G 2310/0224 Details of interlacing
• CPC Class Codes: G09G 2310/06 Details of flat display driving waveforms
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 2320/04 Maintaining the quality of display appearance
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/2014 by modulation of the duration of a single pulse during which the logic level remains constant
• CPC Class Codes: G09G 3/344 based on particles moving in a fluid or in a gas, e.g. electrophoretic devices electrophoretic devices per se G02F1/167

Abstract

The electrophoretic display panel (1) for displaying a picture, has a first and a second opposed substrate (8,9), an electrophoretic medium (5) between the substrates (8,9), a plurality of pixels (2), a first and a second electrode (3,4) associated with each pixel (2), drive means (100) and a temperature probe (11). The electrophoretic medium (5) has charged particles (6) in a fluid. The first and the second electrode (3,4) are able to receive a potential difference having a duration and a level. The drive means (100) are able to control the potential differences for displaying the picture, and the temperature probe (11) is able to measure a temperature indicative for the medium temperature. For the display panel (1) to be able to have pixels (2) with substantially reproducible appearances requiring relatively little energy independent of the ambient temperature, the drive means (100) are able to receive the measured temperature from the temperature probe (11) and to control the potential differences in dependence of the measured temperature.

Claims

1. An electrophoretic display panel for displaying a picture, comprising:

a first and a second opposed substrate;

an electrophoretic medium between the substrates, the electrophoretic medium comprising charged particles in a fluid;

a plurality of pixels;

a first and a second electrode associated with each pixel for receiving a potential difference having a duration and a level;

drive means being able to control the potential differences for displaying the picture; and

a temperature probe being able to measure a temperature indicative for a medium temperature, wherein the drive means are further able to receive the measured temperature from the temperature probe and to control the potential differences in dependence of the measured temperature.

2. A display panel as claimed in claim 1 characterized in that the drive means are able to control the durations in dependence of the measured temperature.

3. A display panel as claimed in claim 2 characterized in that the drive means are able to control each duration to consist of a number of intervals of equal time period, the number being determined by the picture to be displayed and the measured temperature, and the time period being constant.

4. A display panel as claimed in claim 2 characterized in that the drive means are able to control each duration to consist of a number of intervals of equal time period, the number being determined by the picture to be displayed and the time period being determined by the measured temperature.

5. A display panel as claimed in claim 1 characterized in that the drive means are able to control the levels in dependence of the measured temperature.

6. A display panel as claimed in claim 1, characterized in that the first substrate comprises the first electrodes, and the second substrate comprises the second electrodes.