US 10,310,251 B1Granted

System and method for electrowetting display device with color filtering pixel walls

AssigneeAmazon Technologies, Inc.

InventorsGor Manukyan, Tulasi Sridhar Reddy Guntaka

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Abstract

A system and method for a display device are presented. The display device includes a first support plate. A wall is over the first support plate. The wall is associated with an electrowetting pixel. The wall is configured to allow for the propagation of light having a wavelength within a first range of wavelengths and prevents propagation of light having a second wavelength in a second range of wavelengths. A color filter is positioned over the electrowetting pixel. The color filter allows propagation of light having the wavelength within the first range of wavelengths and preventing propagation of light having the second wavelength within the second range of wavelengths.

Claims20

Dependent claims

An electrowetting display device, comprising:

a first support plate and a second support plate;
a first fluid and a second fluid that is immiscible with the first fluid, the first fluid and the second fluid between the first support plate and the second support plate;
a plurality of pixel walls over the first support plate, a pixel wall of the plurality of pixel walls comprising:
a first region associated with a first electrowetting pixel, the first region allowing propagation of visible light of a first color and preventing propagation of visible light of a second color, the second color different from the first color, the first region in contact with first fluid of the first electrowetting pixel to at least partly retain first fluid to the first electrowetting pixel;
and
a second region associated with a second electrowetting pixel, the second region allowing propagation of visible light of the second color and preventing propagation of visible light of the first color, the second region in contact with first fluid of the second electrowetting pixel to at least partly retain first fluid to the second electrowetting pixel;
a color filter over the first electrowetting pixel, the color filter allowing propagation of visible light of the first color and preventing propagation of visible light of the second color;
and
a pixel electrode over the first support plate and a common electrode coupled to the second fluid for applying a voltage within the first electrowetting pixel to cause relative displacement of the first fluid and the second fluid.

6 more elements

A method for fabricating at least a portion of an electrowetting display device, the method comprising:

depositing a first photoresist over a surface of a support plate, the first photoresist transparent to a first color of visible light and absorbing a second color of visible light;
patterning the first photoresist through a first mask to cure a first portion of the first photoresist into a first region of a pixel wall that is transparent to the first color of visible light and absorbing the second color of visible light;
depositing a second photoresist over the surface of the support plate, the second photoresist transparent to the second color of visible light and absorbing the first color of visible light;
patterning the second photoresist through a second mask to cure a second portion of the second photoresist into a second region of the pixel wall that is transparent to the second color of visible light and absorbing the first color of visible light;
providing a first fluid for a first electrowetting pixel in contact with the first region of the pixel wall, so that the first fluid for the first electrowetting pixel is at least partly retained by the first region;
and
providing a first fluid for a second electrowetting pixel in contact with the second region of the pixel wall, so that the first fluid for the second electrowetting pixel is at least partly retained by the second region.

4 more elements

Dependencies are inferred from the claim text.