Display device and mfg. method for particles used in image display

Abstract

A thin display device is provided which is capable of displaying images at a lowered driving voltage in a shortened response time by causing fine particles to travel in a gaseous phase. The display device includes: a display section having upper substrate 1 and lower substrate 2 each having a thickness ranging from about 0.1 mm to about 0.5 mm, which are disposed opposite to each other; colored particles 6 having a particle diameter ranging from about 1 mum to about 10 mum packed in an air layer 7 provided in the gap between the upper substrate 1 and the lower substrate 2; and first electrode 3 and second electrode 4 formed on the underside of the upper substrate 1. The colored particles 6 used in the display device are electrostatically charged either negatively or positively and are caused to travel between the first electrode 3 and the second electrode 4 in accordance with voltage applied to the first and second electrodes 3 and 4.

Description

technical field [0001] The present invention relates to a display device for displaying images, in particular to a thin flexible display device for displaying images by moving fine particles in a gas phase between electrodes. Background technique [0002] In recent years, electrophoretic display devices have been proposed that display images by moving electrophoretic particles between electrodes in a liquid phase filled between a pair of opposing substrates (for example, refer to Patent Document 1). Such an electrophoretic display device uses fine particles for display, so it can be formed into a thin and flexible structure. [0003] However, in the case of the above-mentioned electrophoretic display device, there is a problem that when the electrophoretic particles move in the liquid phase, the response is slow due to the large resistance of the liquid. Therefore, in order to increase the response speed, a display device that displays an image by moving particles in a gas ...

AI Technical Summary

Problems solved by technology

[0015] In addition, in the case of the electrophoretic display device disclosed in Non-Patent Document 1, since the particles 32 move in the solution 33, the moving speed of the particles 22 is slow, and thus, the display response speed to the image signal is insufficient.

Especially in the case of moving images, it is difficult to display the particles 22 due to insufficient response speed

In addition, after moving in the solution 33, the particles 32 attached to the electrode 31 react to even a small voltage and move (that is, the movement threshold voltage of the particles 32 is low), so there are problems such as movement of the particles 32 due to crosstalk voltage and the like.

Therefore, it is difficult to form a simple matrix-driven type

[0016] In addition, in the case of the above-mentioned conventional display device, since the behavior of the particles is unstable, it is not possible to obtain high gradation characteristics.

[0017] In addition, if the toner particles having chargeability used in conventional electrophotography are used in the above-mentioned conventional display device, they are easily affected by the external environment such as humidity. If the humidity is high, the charge amount will decrease, resulting in poor display

[0018] Also, in the case of black-and-white image display or color image display using colored particles among the particles, the reflectance or chromaticity characteristics are not sufficient

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