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High contrast light emitting E-ink Disclosure Number: IPCOM000032853D
Publication Date: 2004-Nov-16
Document File: 1 page(s) / 7K

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The Prior Art Database



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High contrast light emitting E-ink

    The use of fluorescent or phosphorescent particles in E-ink material is described, in order to increase the contrast ratio. Fluorescent (phosphorescent) charged or dipole micro particles are oriented around the positively charged white pigment particles in the E-ink material. During the day, the particles emit under the environmental daylight in the visible range. If phosphorescent particles are used, the particles still emit light during the evening so the E-ink is still readable. Another possibility is to use charged fluorescent or phosphorescent particles instead of the pigment particles directly as charged E-ink material.

    A fluorescent light emitting pigment emits light under activation of black light (UV light). However, if the UV light source is removed, the fluorescent pigment stops emitting. In contradiction, phosphorescent materials will emit light long after the light source has been removed.

    Fluorescent and phosphorescent materials in fine particle sizes and different colours are already available on the market. Such materials can be used in E-ink materials in order to emphasize the bright part of the E-ink and thus increase the contrast ratio of the total E-ink paper. E-ink paper is applied as reflection display paper, however, if fluorescent or phosphorescent materials are used, an emission of light contributes to the contrast level and readability during the absence of sufficient environmental light.

    In order to in...