Optical modulating device, back light module, display apparatus, and fabricating method thereof

Patent metadata

Field	Value
Publication number	US-2020052170-A1
Application number	US-201816080592-A
Country	US
Kind code	A1
Filing date	Mar 20, 2018
Priority date	Sep 18, 2017
Publication date	Feb 13, 2020
Grant date	—

Abstract

The present application provides an optical modulating device having a light transmissive region and a light blocking region. The optical modulating device includes a base substrate; a plurality of protrusions on the base substrate in the light transmissive region and configured to allow light emitting out of a side of the optical modulating device; and a reflective layer on the base substrate in the light blocking region and configured to block light from emitting out of the side of the optical modulating device.

First claim

1 . An optical modulating device having a light transmissive region and a light blocking region, comprising:
a base substrate; a plurality of protrusions on the base substrate in the light transmissive region and configured to allow light emitting out of a side of the optical modulating device; and a reflective layer on the base substrate in the light blocking region and configured to block light from emitting out of the side of the optical modulating device.

2 . The optical modulating device of claim 1 , wherein each of the plurality of protrusions has a first surface on which the reflective layer is absent and a second surface on which the reflective layer is present;
the second surface connecting the first surface with the base substrate; the first surface is in the light transmissive region; and the second surface is in the light blocking region.

3 . The optical modulating device of claim 2 , wherein an orthographic projection of the plurality of protrusions on the base substrate is at least partially non-overlapping with an orthographic projection of the reflective layer on the base substrate; and
an orthographic projection of the first surface of the plurality of protrusions on the base substrate is substantially non-overlapping with the orthographic projection of the reflective layer on the base substrate.

4 . The optical modulating device of claim 1 , further comprising a plurality of recesses in the light transmissive region, each of which on a side of one of the plurality of protrusions distal to the base substrate;
wherein an orthographic projection of the plurality of recesses on the base substrate is substantially non-overlapping with an orthographic projection of the reflective layer on the base substrate.

5 . The optical modulating device of claim 4 , further comprising an insulating layer on a side of the plurality of protrusions distal to the base substrate;
wherein the insulating layer comprises a plurality of insulating blocks, each of which in one of the plurality of recesses and in the light transmissive region.

6 . The optical modulating device of claim 1 , wherein the base substrate and the plurality of protrusions are formed as an integral light transmission layer.

7 . The optical modulating device of claim 1 , wherein the plurality of protrusions are a plurality of nanoscale protrusions.

8 . The optical modulating device of claim 1 , wherein the optical modulating device is a light guide plate.

9 . A back light module, comprising the optical modulating device of claim 1 and one or more light sources.

10 . A display apparatus, comprising the back light module of claim 9 .

11 . A method of fabricating an optical modulating device having a light transmissive region and a light blocking region, comprising:
forming a light transmission layer comprising a plurality of protrusions on a base substrate in the light transmissive region and configured to allow light emitting out of a side of the plurality of protrusions; and forming a reflective layer on the base substrate in the light blocking region and configured to block light from emitting out of the light transmission layer.

12 . The method of claim 11 , wherein prior to forming the reflective layer, further comprising forming an insulating layer having a plurality of insulating blocks, each of which on a side of one of the plurality of protrusions distal to the base substrate.

13 . The method of claim 12 , wherein forming the reflective layer comprises forming a reflective material layer on the base substrate in a region outside the plurality of insulating blocks.

14 . The method of claim 12 , wherein forming the reflective layer comprises:
forming a reflective material layer throughout the light transmission layer, the reflective material layer being formed to cover a region having the plurality of insulating blocks and a region outside the plurality of insulating blocks; and removing the insulating layer; wherein a portion of the reflective material layer on a side of the plurality of insulating blocks distal to the base substrate is removed together with the insulating layer, thereby forming a reflective layer.

15 . The method of claim 11 , further comprising:
forming a mold; embossing a light transmission main body using the mold; and separating the mold from the light transmission main body to form the light transmission layer having the plurality of protrusions on the base substrate.

16 . The method of claim 15 , wherein forming the mold comprises:
forming a replication master layer on a second base substrate, the replication master layer is formed to include a plurality of replication masters corresponding to the plurality of protrusions to be formed in the optical modulating device; forming a conductive surface on an exposed surface of the replication master layer and the second base substrate; forming a metal layer on the conductive surface; and separating the metal layer from the replication master layer and the second base substrate, thereby forming the mold.

17 . The method of claim 15 , wherein embossing the light transmission main body comprises:
embossing the light transmission main body using the mold, thereby forming a light transmission layer having a plurality of protrusions on a base substrate, and a plurality of recesses, each of which on a side of one of the plurality of protrusions distal to the base substrate.

18 . The method of claim 17 , wherein prior to forming the reflective layer, further comprising forming an insulating layer having a plurality of insulating blocks, each of which on a side of one of the plurality of protrusions distal to the base substrate;
wherein forming the insulating layer comprises: printing an ink in the plurality of recesses on a side of the plurality of protrusions distal to the base substrate; and curing the ink in the plurality of recesses on a side of the plurality of protrusions distal to the base substrate, thereby forming the insulating layer having a plurality of insulating blocks, each of which in one of the plurality of recesses.

19 . The method of claim 11 , wherein forming the light transmission layer comprises forming the plurality of protrusions and the base substrate as an integral structure.

20 . The method of claim 12 , wherein forming the reflective layer comprises:
forming a reflective material layer throughout the light transmission layer, the reflective material layer being formed to cover a region having the plurality of protrusions and a region outside the plurality of protrusions; and removing a portion of the reflective material layer on a side of the plurality of insulating blocks distal to the base substrate thereby forming the reflective layer.

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Display Tech Co

Inventors

• Qi Yonglian
• Qu Lianjie
• Zhao Hebin
• Gui Bingqiang
• Yang Xianxue
• Liu Shuai
• Shi guangdong

Classifications

• G02B6/0065

  Manufacturing aspects; Material aspects · CPC title

• G02B6/0035

  provided on the surface of the light guide or in the bulk of it · CPC title

• G02B6/0055 Primary

  Reflecting element, sheet or layer · CPC title

• G02F1/133603

  with LEDs · CPC title

• H01L33/60 Primary

  Electricity · mapped topic