Electrophoretic display with thermal control
First Claim
1. An electrophoretic display (EPD) module structure, comprising the following i), ii), iii) and iv), structurally in the order of:
- i) an EPD panel comprising EPD cells filled with EPD display media comprising charged pigment particles dispersed in a dielectric solvent;
ii) a front air gap;
iii) a thermal control pad; and
iv) a rear air gap,wherein said thermal control pad controls a temperature associated with the EPD display media to ensure that a threshold voltage of the EPD cells is equal to or greater than one third of a driving voltage used to drive the EPD cells to a desired color display state, wherein the threshold voltage is a maximum bias voltage that does not cause the charged pigment particles in the EPD cells to move between electrodes.
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Accused Products
Abstract
An electrophoretic display (EPD) with thermal control is disclosed for controlling and maintaining an image in extreme temperature environments. Techniques are also disclosed for maintaining the EPD cell threshold voltage for EPD cells comprising an EPD display media at or above a desired level in an environment in which the EPD may be subjected to an extreme temperature. The techniques comprise sensing a sensed temperature associated with the EPD display media, determining whether the sensed temperature satisfies a criterion established to ensure that the display media temperature remains at a level associated with an acceptable EPD cell threshold voltage, and in the event it is determined that the sensed temperature does not satisfy the criterion, controlling the EPD display media temperature as required to bring the sensed temperature to a level that satisfies the criterion.
100 Citations
14 Claims
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1. An electrophoretic display (EPD) module structure, comprising the following i), ii), iii) and iv), structurally in the order of:
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i) an EPD panel comprising EPD cells filled with EPD display media comprising charged pigment particles dispersed in a dielectric solvent; ii) a front air gap; iii) a thermal control pad; and iv) a rear air gap, wherein said thermal control pad controls a temperature associated with the EPD display media to ensure that a threshold voltage of the EPD cells is equal to or greater than one third of a driving voltage used to drive the EPD cells to a desired color display state, wherein the threshold voltage is a maximum bias voltage that does not cause the charged pigment particles in the EPD cells to move between electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification