REFLECTIVE TYPE LIQUID CRYSTAL DISPLAY DEVICE

• US 20160154284A1
• Filed: 11/16/2015
• Published: 06/02/2016
• Est. Priority Date: 11/28/2014
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Sano, Takumi
• Granted Patent: US 9,740,063 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/136218 Shield electrodes
• CPC Class Codes: G02F 1/136222 Colour filters incorporated in the active matrix substrate

Abstract

According to one embodiment, a reflective type liquid crystal display device 11 that can be manufactured at low cost and that can improve a response speed and an aperture ratio is provided. A liquid crystal layer is a positive type liquid crystal layer including vertically-aligned liquid crystal molecules between an array substrate and a counter substrate. The array substrate includes a plurality of pixel electrodes, a plurality of common electrodes, a color filter, and a reflection layer. The color filter is disposed in a lower layer of the pixel electrodes and the common electrodes. The reflection layer is electrically connected to either the common electrodes or the pixel electrodes, and disposed at least in a lower layer of the color filter so as to reflect light having passed through the color filter.

Claims

1. A reflective type liquid crystal display device comprising:

a first substrate;

a second substrate that is disposed at a position facing the first substrate; and

a positive type liquid crystal layer that includes vertically-aligned liquid crystal molecules between the first substrate and the second substrate, wherein

the first substrate includes

a plurality of pixel electrodes,

a plurality of common electrodes each of which forms a transverse electric field to align the liquid crystal molecules between each of the plurality of pixel electrodes and each of the plurality of common electrodes,

a color filter that is disposed in a lower layer of the pixel electrodes and the common electrodes, and

a reflection layer that is electrically connected to either the common electrodes or the pixel electrodes, and that is disposed in a lower layer of the color filter so as to reflect light having passed through the color filter.

2. The reflective type liquid crystal display device according to claim 1, wherein

each of the pixel electrodes and the common electrodes respectively has a prescribed width, and a space between each of the pixel electrodes and each of the common electrodes is set to two times wider or more than the width.

3. The reflective type liquid crystal display device according to claim 1, wherein

the second substrate includes, at positions facing the pixel electrodes, ribs having light transmitting properties and having a lower dielectric constant than a dielectric constant of the liquid crystal layer.

4. The reflective type liquid crystal display device according to claim 3, wherein

each of the ribs is set wider and thicker than each of the pixel electrodes.

5. The reflective type liquid crystal display device according to claim 4, wherein

each of the ribs is 0.3 to 0.4 times wider than the color filter, and 0.3 to 0.4 times thicker than the liquid crystal layer.

6. The reflective type liquid crystal display device according to claim 4, wherein

the dielectric constant of the ribs is 0.1 to 0.2 times of the dielectric constant of the liquid crystal layer.