We have developed a color and flexible electronic paper display using electronic liquid powder. Novel types of color display either colored powder or color filter are discussed. We have also developed a flexible display with low cost substrate films with a high throughput roll‐to‐roll manufacturing system. These technologies enable QR‐LPD® to be used widely as an electronic paper display.
Really paper‐like display as thin as 290 μm has been developed, which has a 160×160 array of pixels, 3.1‐inch diagonal viewable image size, and white‐paper appearance. Plastic substrate with 120 μm in thickness was used resulting in a flexible display which can be bent up to 20 mm in radius of curvature. This can be realized only by QR‐LPD® technology.
Abstract— We have developed new powder materials that exhibit liquid behavior, which can lead to the realization of novel bistable and reflective displays having paper‐white appearance, high contrast, and quick response. Two types of display were demonstrated, one had 160 × 160 array of pixels and the other had 320 × 320 in a 3.1‐in.‐diagonal viewable image size corresponding to 66 and 132 dpi, respectively. These displays were driven by passive‐matrix addressing. The displays showed a reflectivity of more than 41%, a contrast more than 1:10, and a pixel response time of less than 0.2 msec. The seven‐segment display for use in clocks was also demonstrated.
We have developed new liquid‐behavior‐powder materials that realize a novel type of bistable reflective display showing paper‐white appearance, high contrast and quick response. The demonstrated display has a 160×160 array of pixels and a 3.1‐ inch diagonal viewable image size with a pixel response less than 0.2 msec and is driven by passive‐matrix addressing.
Transparent conductive polymer of PEDOT/PSS has been applied to top electrodes of flexible electronic‐paper display. High resolution electrode patterning of the polymer materials in a line shape has been performed by laser ablation method. An 8.4‐in. diagonal and 82 dpi flexible electronic paper using quick response liquid‐powder technology has been prepared by applying the patterned flexible substrates. The flexible electronic paper with PEDOT/PSS electrodes has exhibited comparable display properties to that consisting of ITO electrodes.
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