Display panel and display device

Patent metadata

Field	Value
Publication number	US-2019339566-A1
Application number	US-201715750599-A
Country	US
Kind code	A1
Filing date	Jul 17, 2017
Priority date	Sep 30, 2016
Publication date	Nov 7, 2019
Grant date	—

Abstract

A display panel and a display device are disclosed. The display panel includes a first substrate, a liquid crystal layer, a waveguide layer, a grating layer, a quantum dot color filter layer, a first electrode and a second electrode, wherein the first electrode and the second electrode are configured to adjust a refractive index of the liquid crystal layer by changing voltages applied thereto; wherein a coupling efficiency at which light is coupled out of the waveguide layer is determined according to a difference between the refractive index of the liquid crystal layer and a refractive index of the grating layer.

First claim

1 - 13 . (canceled)

14 . A display panel, comprising a first substrate, a liquid crystal layer, a waveguide layer, a grating layer, a quantum dot color filter layer, a first electrode and a second electrode, wherein the liquid crystal layer, the grating layer, the quantum dot color filter layer, the first electrode and the second electrode are located between the waveguide layer and the first substrate, and the grating layer is located on a side of the waveguide layer proximal to the liquid crystal layer;
the first electrode and the second electrode are configured to adjust a refractive index of the liquid crystal layer by changing voltages applied thereto; and a coupling efficiency at which light is coupled out of the waveguide layer is determined according to a difference between the refractive index of the liquid crystal layer and a refractive index of the grating layer.

15 . The display panel of claim 14 , wherein the second electrode and the first electrode are located on one side of the liquid crystal layer.

16 . The display panel of claim 14 , wherein the second electrode and the first electrode are located on different sides of the liquid crystal layer.

17 . The display panel of claim 14 , wherein the refractive index of the grating layer ranges from an ordinary refractive index n o of the liquid crystal layer to an extraordinary refractive index n e of the liquid crystal layer.

18 . The display panel of claim 17 , wherein the refractive index of the grating layer is the extraordinary refractive index n e of the liquid crystal layer.

19 . The display panel of claim 14 , further comprising a second substrate located on a side of the waveguide layer distal to the first substrate.

20 . The display panel of claim 19 , wherein the second electrode is located on a side of the waveguide layer proximal to the first substrate, the grating layer is located on a side of the second electrode proximal to the first substrate, and the liquid crystal layer is located on a side of the grating layer proximal to the first substrate; and
the first electrode is located on a side of the first substrate proximal to the second substrate.

21 . The display panel of claim 20 , wherein the quantum dot color filter layer is located on a side of the first electrode proximal to the second substrate.

22 . The display panel of claim 20 , wherein the quantum dot color filter layer is located between the second electrode and the grating layer.

23 . The display panel of claim 21 , wherein a refractive index of the second electrode is smaller than a refractive index of the waveguide layer, and a refractive index of the second substrate is smaller than the refractive index of the waveguide layer.

24 . The display panel of claim 14 , wherein the liquid crystal layer is made of a nematic liquid crystal, a cholesteric liquid crystal, or a blue-phase liquid crystal.

25 . The display panel of claim 14 , wherein the grating layer comprises shading bars arranged at intervals, the liquid crystal layer covers the grating layer and fills gaps between the shading bars, and the liquid crystal layer has a thickness greater than a thickness of the grating layer.

26 . The display panel of claim 14 , wherein
in a case where the difference between the refractive index of the liquid crystal layer and the refractive index of the grating layer is zero, the coupling efficiency at which light is coupled out of the waveguide layer is zero, so that the display panel is in L0 grayscale state.

27 . The display panel of claim 14 , wherein in a case where an absolute value of the difference between the refractive index of the liquid crystal layer and the refractive index of the grating layer is equal to a set value, the coupling efficiency at which light is coupled out of the waveguide layer is a set coupling efficiency, so that the display panel is in L255 grayscale state.

28 . The display panel of claim 14 , wherein in a case where an absolute value of the difference between the refractive index of the liquid crystal layer and the refractive index of the grating layer is larger than zero and smaller than a set value, the coupling efficiency at which light is coupled out of the waveguide layer is larger than zero and smaller than a set coupling efficiency, so that the display panel is in a grayscale state between L0 grayscale state and L255 grayscale state.

29 . A display device, comprising a backlight and the display panel of claim 14 .

30 . The display device of claim 29 , wherein the backlight is located at a side of the display panel, the backlight is arranged at least correspondingly to the waveguide layer, and a light exiting direction of light from the backlight is parallel to a plane where the waveguide layer is located.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Tan Jifeng
• Wang Wei
• Dong Xue

Classifications

• G02B6/005

  provided by one optical element, or plurality thereof, placed on the light output side of the light guide · CPC title

• G02F2202/36

  Micro- or nanomaterials · CPC title

• G02F1/133617

  Illumination with ultraviolet light; Luminescent elements or materials associated to the cell · CPC title

• G02F1/133504 Primary

  Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606) · CPC title

• G02F1/1326

  Liquid crystal optical waveguides or liquid crystal cells specially adapted for gating or modulating between optical waveguides · CPC title