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Abstract
An improved full color active matrix electronic paper display(EPD) prototype 代写留学生论文using a custom design color filter array with EInk’s electrophoretic technology is reported. Improvements overprevious efforts are achieved by using a) improved inkformulations with higher dynamic range, b) 4 bit gray scale foreach color and c) a color filter design with RGBW pixel layout toimprove brightness and dynamic range. As a result, the whitenessof the background page is preserved while enabling color. Inaddition, due to the “paper-like” optics, the brightness andsaturation of the optical states are largely independent of viewingangle or illumination conditions.

1.Introduction
During the past few years, electrophoretic paper displays (EPD)have steadily advanced in capabilities and performance in themonochrome domain [1-6]. However, there is a significant marketpotential for a color EPD that is commercially viable withenhanced color performance.
One application for this color electronic paper display module isfor seeing digital information outdoors. Digital cameras, ATMs,kiosks, GPS devices and electronic signs can be seen clearly atany angle, even under sunlight using the new display module. Thedisplay will also be useful for any portable electronic device thatrequires a battery. The new display module will enable cellphones, PDAs, and wireless tablets to run substantially longer ona single charge, allowing designers to make more compact devicesby reducing battery size and weight.

2. Previous Design
In our earlier publication [8-9], we described the first efforts to integrate a color filter array (CFA), EPD optical material, and a commercially available TFT array. The QVGA panel was 320 (x3) x 234 and had an active area with 5.0” diagonal. The QVGA research prototype display was driven to produce 3-bit color (2 optical states per subpixel).

7. References
[1] Comiskey, B., et al, “An electrophoretic ink for all-printedreflective electronic displays”, Nature, 394, p. 253, 1998.
[2] Comiskey, B. Albert, J.D., and Jacobson, J., “Electrophoreticink: A printable display material”, SID Symposium Digest,pp. 75-76, 1997.
[3] Danner, G.M., Fiske, T.G., Silverstein, L.D., DisplayPerformance for Mobile Device Applications, in Proceedingsof the 21st International Display Research Conference, p.1653. ITE, Nagoya, Japan, 2001.
[4] Ritter, J. Active-matrix Electrophoretic Displays, inProceedings of the 21st International Display ResearchConference, p. 343. ITE, Nagoya, Japan, 2001.
[5] Ritter, J. “The Promise of Electronic Ink”, InformationDisplay, Information Display. Vol. 17, no. 12, pp. 22-25.Dec. 2001.
[6] Webber, R. M., “Image Stability in Active-MatrixMicroencapsulated Electrophoretic Displays”, SIDSymposium Digest, P-10.4, 200
[7] Pitt, M., “Power Consumption of MicroencapsulatedElectrophoretic Displays for Smart Handheld Applications”,SID Symposium Digest, P-53.2, 2002.
[8] Duthaler, G., et al., "Active-Matrix Color Displays UsingElectrophoretic Ink and Color Filters", SID SymposiumDigest, pp. 1374, 2002.
[9] Duthaler,https://www.51lunwen.org/liuxuelunwendx/ G., et al, “Paper-like Color Displays UsingElectrophoretic Ink and Color Filters”, Proceedings of the21st International Display Research Conference, p. 473. ITE,Nagoya, Japan, 2001.