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A fast full color electrophoretic display with improved driving

A display, color electrophoretic technology, applied in the field of color electrophoretic display, can solve problems such as limited brightness and/or color saturation, complexity and cost, slow update speed, etc.

Inactive Publication Date: 2008-08-13
ADREA LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, current designs either have limited brightness and / or color saturation, or are very complex and expensive, and thus are often associated with slow update speeds

Method used

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  • A fast full color electrophoretic display with improved driving
  • A fast full color electrophoretic display with improved driving
  • A fast full color electrophoretic display with improved driving

Examples

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Embodiment Construction

[0045] FIG. 1 illustrates the entire spectrum of visible light, including a red region 101 , a green region 102 and a blue region 103 . The cyan color filter absorbs the red region 107 , the magenta color filter absorbs the green region 108 , and the yellow color filter absorbs the blue region 109 . This type of color filter is often called subtractive because one specific color is eliminated while other colors remain unaffected. In comparison, a red color filter absorbs green and blue regions 105 (leaving red light unaffected), a green color filter absorbs red and blue regions 106, and a blue color filter absorbs red and green regions 104.

[0046] FIG. 2 schematically shows a cross-section of a pixel 200 comprising cyan 210 , magenta 220 and yellow 230 sub-pixels. That particular pixel instead displays pure red light. Therefore, the red light is reflected and the remaining light is absorbed. Cyan subpixel 210 cannot display red light (absorbed by cyan color filter 211 ), ...

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Abstract

The present invention provides a novel design for color electrophoretic displays. In the display, each pixel (200) comprises at least two sub-pixels (210, 220, 230), and each sub pixel is fitted with a color filter (211, 221, 231) and contains an electrophoretic media comprising two particle types (201, 202, 203). The color filters (211, 221, 231) in the sub-pixels of each pixel have essentially non-overlapping absorption bands, and together cover essentially all of the wavelengths over which the display is operative. Furthermore, the absorption bands of the particles in each sub-pixel (210, 220, 230) each cover a portion of the wavelengths that is not covered by the filter (211, 221, 231) in the respective sub-pixel. The wavelength bands typically correspond to different colors. Thereby each wavelength band, or color, can be emitted by more than one sub-pixel in each pixel, resulting in increased brightness. According to one particular embodiment, each pixel comprises three sub-pixels having a cyan, magenta, and yellow absorbing filter, respectively.

Description

technical field [0001] The present invention relates to electrophoretic displays, and in particular to color electrophoretic displays which provide high brightness, high update speed and ease of manufacture. Background technique [0002] Using monochrome displays in combination with structured RGB (red, green, blue) color filters, full color electrophoretic displays can be provided - this has been demonstrated with E-Ink displays. The structured RGB filter transmits red, green and blue light via corresponding R, G and B segments. Light that is not transmitted is absorbed in the filter and is essentially converted to heat. A general problem with using such full-color schemes is that the brightness of the display is limited. Essentially, a full-color display is only 1 / 3 brighter than a monochrome version due to absorption in the RGB filters. The remaining 2 / 3 of the light is absorbed in the color filter. A prior art system according to this principle is offered by E Ink Co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/167G02F1/1677
CPCG02F2001/1678G09G2320/0252G02F1/167G09G3/3446G02F1/1677
Inventor M·T·约翰逊L·J·M·舒兰根P·J·贝斯朱G·周
Owner ADREA LLC
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