Display device

Patent metadata

Field	Value
Publication number	US-10852572-B2
Application number	US-201816198076-A
Country	US
Kind code	B2
Filing date	Nov 21, 2018
Priority date	Nov 24, 2017
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

A display includes a first substrate, a second substrate, a liquid crystal layer between the first substrate and the second substrate, pixel driving electrodes for pixels, the pixel driving electrodes being provided on the first substrate and configured to provide control electric fields to the liquid crystal layer, louver elements, louver element driving electrodes provided on a face facing the first substrate of the second substrate, and an unseparated shield electrode between the louver element driving electrodes and the liquid crystal layer. Each of the louver elements are configured to stand on the second substrate, be sandwiched between one of the louver element driving electrodes and the shield electrode, and change amount of light to be transmitted in accordance with voltage applied across the louver element driving electrode and the shield electrode to change viewing angle.

First claim

What is claimed is:

1. A display device configured to display an image with a plurality of pixels, the display device comprising:
a first substrate;
a second substrate opposed to the first substrate;
a liquid crystal layer disposed between the first substrate and the second substrate;
pixel driving electrodes for the plurality of pixels, the pixel driving electrodes being provided on the first substrate and configured to provide control electric fields to the liquid crystal layer;
opposite electrodes for the plurality of pixels, the opposite electrodes being provided on the first substrate and configured to provide control electric fields to the liquid crystal layer together with the pixel driving electrodes for the plurality of pixels;
a plurality of louver elements each including colored electrophoretic particles and liquid encapsulated in a groove of a resin layer;
a plurality of louver element driving electrodes provided on a face facing the first substrate of the second substrate;
an unseparated shield electrode disposed between the plurality of louver element driving electrodes and the liquid crystal layer, the shield electrode being provided on the second substrate and being grounded; and
a controller configured to control potentials of the plurality of louver element driving electrodes,
wherein each of the plurality of louver elements are configured to:
stand on the second substrate;
be sandwiched between one of the plurality of louver element driving electrodes and the shield electrode; and
change an amount of light to be transmitted in accordance with voltage applied across the louver element driving electrodes and the shield electrode to change a viewing angle,

wherein the shield electrode is included in a conductive black matrix defining regions of the plurality of pixels, and
wherein the controller is configured to control potentials of the louver element driving electrodes in such a manner that a polarity of the shield electrode included in the black matrix relative to polarities of the louver element driving electrodes is opposite to a polarity of charge of the colored electrophoretic particles in a wide viewing angle mode.

2. The display device according to claim 1 , wherein each of the plurality of louver element driving electrodes is a part of a single planar transparent metal layer.

3. The display device according to claim 1 , wherein regions of the plurality of louver elements are included in a region of a black matrix provided on the second substrate when seen in a direction normal to a main face of the second substrate, the black matrix defining regions of the plurality of pixels.

4. The display device according to claim 1 ,
wherein the plurality of louver elements include:
a plurality of first louver elements extending in a first direction and being disposed side by side in a second direction perpendicular to the first direction; and
a plurality of second louver elements extending in the second direction and being disposed side by side in the first direction, and

wherein each of the plurality of first louver elements links with the plurality of second louver elements at intersections between the plurality of first louver elements and the plurality of second louver elements.

5. The display device according to claim 1 ,
wherein the controller is configured to:
provide ground potential to the louver element driving electrodes in a narrow viewing angle mode; and
provide a second fixed potential different from the ground potential to the louver element driving electrodes in the wide viewing angle mode.

Assignees

• Tianma Japan Ltd

Inventors

• Nishimura Hideki
• Asakura Tetsuroh
• Nakanishi Futoshi

Classifications

• G02F1/13452

  Conductors connecting driver circuitry and terminals of panels · CPC title

• G09G3/344

  based on particles moving in a fluid or in a gas, e.g. electrophoretic devices (electrophoretic devices per se G02F1/167) · CPC title

• G09G3/36

  using liquid crystals · CPC title

• G02F2201/44

  Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers · CPC title

• G02F1/13306

  Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence) · CPC title