Full-screen optical component and electronic device

Patent metadata

Field	Value
Publication number	US-11614657-B2
Application number	US-202017126722-A
Country	US
Kind code	B2
Filing date	Dec 18, 2020
Priority date	Oct 11, 2018
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

A full-screen optical component, applied to an electronic device comprising a display screen, comprising a backlight module, an active light sensor including a sensor and a light emitter, and a dimmer. The display screen and the active light sensor are located on two opposite sides of the backlight module. The backlight module includes a first prism film and a second prism film stacked on the first prism film. The first prism film includes several first prisms. The second prism film includes several second prisms. The first prism includes a first in-light surface, and the second prism includes a second in-light surface. A display surface of the display screen, the first in-light surface, and the second in-light surface are disposed in parallel. The dimmer is configured to direct light emitted by the light emitter to the first in-light surface at an incident angle that is inclined relative to a vertical direction.

First claim

What is claimed is:

1. A full-screen optical component comprising:
a backlight system comprising:
a first side, wherein a display screen, of an electronic device, comprising a display surface is located on the first side;
a second side;
a first prism film comprising a plurality of first prisms disposed in parallel, wherein each first prism comprises:
a first in-light surface configured to dispose in parallel to the display surface; and
a first out-light surface; and

a second prism film stacked on the first prism film and comprising a plurality of second prisms disposed in parallel, wherein each second prism comprises:
a second in-light surface configured to dispose in parallel to the display surface; and
a second out-light surface, wherein a second long axis of a second prism is perpendicular to a first long axis of a first prism;

an active light sensor located on the second side and comprising:
a light emitter configured to emit light; and
a sensor configured to sense a reflected light signal of the light; and

a dimmer coupled to the backlight system and configured to direct the light to the first in-light surface at a first incident angle inclined relative to a vertical direction, such that the light is then emitted from the first out-light surface after being refracted by the first prism, enters the second in-light surface at a second incident angle inclined relative to the vertical direction, and is emitted from the second out-light surface after being refracted by the second prism, such that the light passes through the display screen at a vertical angle.

2. The full-screen optical component of claim 1 , wherein a direction perpendicular to the display screen is a Z-axis, the first long axis is a Y-axis, and the second long axis is an X-axis in a coordinate system, wherein an origin of the coordinate system is located on incident light on the first prism film or an extension line of the light, wherein the dimmer is further configured to enable an included angle α, between the Z-axis and a projection of the light incident on the first in-light surface on an X-Z plane or on a Y-Z plane, calculated as follows:

α
=

arcsin
(

ηcos
(

γ
2

+

arcsin
(

cos
⁡

(

γ
2

)

η

)

)

)

,

wherein γ is a degree of a vertex angle of the first prism and the second prism, and wherein η is a refractive index of a material of the first prism and the second prism.

3. The full-screen optical component of claim 2 , wherein the dimmer is a right-angle prism film comprising a plurality of right-angle prisms disposed parallelly in sequence, wherein a long axis of a first right-angle prism of the right-angle prisms is perpendicular to an angle bisector of the X-axis and the Y-axis, wherein a bottom surface of the first right-angle prism is parallel to the display surface, wherein the light is incident at a right-angle on the bottom surface and is emitted from a right-angle surface of the first right-angle prism, wherein the light is directly incident on the first in-light surface, wherein an extension direction of the right-angle surface is perpendicular to the first in-light surface, and wherein an emergent angle between the light and the right-angle surface is the same as the first incident angle.

4. The full-screen optical component of claim 3 , wherein an included angle between a bevel of the first right-angle prism and the bottom surface is θ calculated as follows:
θ=( a sin(cos(φ)/ n )+π/2)/2,

wherein φ is a degree of the emergent angle, and wherein n is a refractive index of the first right-angle prism.

5. The full-screen optical component of claim 3 , wherein the light is perpendicular to an X-Y plane, and wherein the bottom surface is parallel to the X-Y plane and is located on the light emitter.

6. The full-screen optical component of claim 3 , wherein the right-angle prism film is made of a polyethylene terephthalate material.

7. The full-screen optical component of claim 3 , wherein the backlight system further comprises:
a light guide plate comprising a light emitting side, wherein the first prism film is stacked on the light emitting side; and
a reflector plate stacked on an opposite side of the light emitting side and configured to reflect visible light and transmit infrared light, wherein either the right-angle prism film is stacked between the light guide plate and the reflector plate or the right-angle prism film is stacked on a surface of the reflector plate opposite to the light guide plate.

8. The full-screen optical component of claim 7 , wherein the light emitter comprises an emission end face disposed parallel to the display surface and faces the bottom surface, wherein the sensor comprises a sensing end face, and wherein the sensing end face and the emission end face are located on a same plane.

9. The full-screen optical component of claim 8 , wherein a separate rib is disposed between the sensing end face and the emission end face and is configured to isolate the light and the reflected light signal sensed by the sensor.

10. The full-screen optical component of claim 7 , wherein the reflector plate is made of one of polymethyl methacrylate, polycarbonate, or polyimide materials.

11. The full-screen optical component of claim 8 , wherein a light concentration layer is disposed on the sensing end face and is configured to aggregate the reflected light signal on the sensing end face such that the light enters the sensor.

12. The full-screen optical component of claim 1 , wherein the electronic device further comprises a substrate comprising an end face disposed parallel to the display surface, wherein the dimmer is disposed on the end face and comprises a bevel, wherein an included angle α is between a Y-axis and an intersection line of the bevel and a Y-Z plane, and between an X-axis and an intersection line of the bevel and an X-Z plane, and wherein the light emitter is located on the bevel and emits the light perpendicular to the bevel.

13. The full-screen optical component of claim 12 , wherein the sensor comprises a photosensitive end face, and wherein either the sensor is mounted on the end face and the end face is disposed parallel to the photosensitive end face or the sensor is mounted on the bevel and the bevel is disposed parallel to the photosensitive end face.

14. The full-screen optical component of claim 1 , wherein the backlight system further comprises:
a light homogenizing film stacked with the first prism film; and
a first through hole disposed on the light homogenizing film and configured to pass the

Assignees

• Huawei Tech Co Ltd

Inventors

• Wang Minchang
• Wei Wenxiong
• Hu Yi
• Zhu Yonghao

Classifications

• G02F1/133606 Primary

  including a specially adapted diffusing, scattering or light controlling members · CPC title

• G09G3/3406

  Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336) · CPC title

• H03K2217/94108

  making use of reflection · CPC title

• G02B5/208

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title

• G02F1/133314

  Back frames · CPC title