# US 11,906,878 B2 · Fill light device, method for controlling fill light device, and computer storage medium

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- Number: US 11,906,878 B2
- Document ID: US11906878B2
- Status: Granted
- Kind: B2
- Application number: 17/514,491
- Filed: 2021-10-29
- Published: 2022-02-17
- Granted: 2024-02-20
- Earliest claimed: 2019-12-04
- Assignees: Shenzhen Transsion Holdings Co., Ltd.
- Applicants: Shenzhen Transsion Holdings Co., Ltd.
- Inventors: Ming Xiao; Lingzhi Li; Haibin Wang; Zihui Zhao; Binjie Zhu; Wenhui Dai
- Web page: https://patentgrep.com/patent/US11906878B2

## CPC

- G03B 15/05: Combinations of cameras with electronic flash apparatus; Electronic flash units
- H04N 23/55: Optical parts specially adapted for electronic image sensors; Mounting thereof
- H04N 23/611: where the recognised objects include parts of the human body
- H04N 23/62: Control of parameters via user interfaces
- H04N 23/74: by influencing the scene brightness using illuminating means
- G03B 2215/0503: Built-in units
- G03B 2215/0567: Solid-state light source, e.g. LED, laser
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

Disclosed are a fill light device, a method for controlling a fill light device, and a computer readable storage medium. The fill light device includes a flash light; and a light guide, the light guide being located on a light-exiting side of the flash light and being configured to be controlled to change a shape and/or a light-transmitting area to change a light-exiting area and/or a light-emitting angle of the fill light device. The method includes obtaining a control parameter of the light guide; and changing a shape and/or a light-transmitting area of the light guide according to the control parameter to change a light-exiting area and/or a light-emitting angle of the fill light device.

## Claims

### Claim 1

A method for controlling a fill light device, the fill light device comprising a flash light and a light guide, the light guide comprising a first polarizer, a liquid crystal layer, and a second polarizer arranged in sequence, and the light guide being located on a light-exiting side of the flash light, wherein the method comprises:
performing face detection on a preview image of a camera module;
in response to detecting a face in the preview image, performing pupil identification to determine a pupil position;
determining a light-shielding area of the light guide according to the pupil position;
determining a light-emitting angle of the fill light device according to a distance between a capturing target and the fill light device to obtain a control parameter of the light guide; and
changing a shape and/or a light-transmitting area of the light guide according to the control parameter to change a light-exiting area and/or the light-emitting angle of the fill light device.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
controlling the flash light to pre-flash at a preset power for a preset number of times or controlling the flash light to continue lighting during a process of obtaining the preview image.

### Claim 3 (depends on 1)

The method of claim 1, wherein the light guide comprises a first polarizer, a liquid crystal layer, and a second polarizer arranged in sequence, and
the operation of changing a shape and/or a light-transmitting area of the light guide according to the control parameter comprises:
controlling an orientation of a liquid crystal of the liquid crystal layer according to the light-shielding area, thereby the light guide is opaque in the light-shielding area.

### Claim 4 (depends on 1)

The method of claim 1, wherein the fill light device further comprises a diastimeter for detecting a distance between a capturing target and the fill light device, and
the operation of obtaining a control parameter of the light guide comprises:
obtaining the distance between the capturing target and the fill light device; and
obtaining a first preset light-emitting angle as a target light-emitting angle to obtain the control parameter, or obtaining a light-emitting angle corresponding to the distance as a target light-emitting angle to obtain the control parameter, in response to a determination that the distance is greater than or equal to a preset distance.

### Claim 5 (depends on 4)

The method of claim 4, wherein the operation of obtaining a control parameter of the light guide further comprises:
obtaining a second preset light-emitting angle as a target light-emitting angle to obtain the control parameter in response to a determination that the distance is less than the preset distance, wherein the second preset light-emitting angle is greater than the first preset light-emitting angle.

### Claim 6 (depends on 4)

The method of claim 4, wherein the light guide is connected to a deformation driving assembly for driving the light guide to deform, and
the operation of changing a shape and/or a light-transmitting area of the light guide according to the control parameter comprises:
determining a driving stroke of the deformation driving assembly according to the target light-emitting angle; and
controlling the deformation driving assembly to drive the light guide to deform according to the driving stroke to change the shape of the light guide.

### Claim 7 (depends on 6)

The method of claim 6, wherein the deformation driving assembly comprises magnets, a coil, and a driving ring, the driving ring is configured to surround the light guide, the coil is configured to surround the driving ring, and the magnets are located on opposite sides of the driving ring, and
the operation of controlling the deformation driving assembly to drive the light guide to deform according to the driving stroke comprises:
obtaining an energizing current of the coil according to the driving stroke; and
energizing the coil according to the energizing current, thereby the driving ring is driven to push up the light guide for deformation.

### Claim 8 (depends on 6)

The method of claim 6, wherein after the operation of changing a shape and/or a light-transmitting area of the light guide according to the control parameter to change a light-exiting area and/or a light-emitting angle of the fill light device, the method further comprises:
controlling the flash light to flash or continue lighting according to a capturing operation or a lighting operation.

### Claim 9

A fill light device, comprising:
a flash light;
a light guide, the light guide being located on a light-exiting side of the flash light;
an identification module, wherein the identification module is configured to perform face detection on a preview image of a camera module, perform pupil identification to determine a pupil position in response to detecting a face in the preview image, thereby a light-shielding area of the light guide is determined according to the pupil position; and
a diastimeter for detecting a distance between a capturing target and the fill light device, thereby a light-emitting angle of the fill light device is determined according to the distance between the capturing target and the fill light device, to obtain a control parameter of the light guide;
wherein the light guide is configured to be controlled to change a shape and/or a light-transmitting area according to the control parameter to change a light-exiting area and/or the light-emitting angle of the fill light device.

### Claim 10 (depends on 9)

The fill light device of claim 9, wherein the number of the flash light may be one, two or more, and being arranged in parallel or in a matrix.

### Claim 11 (depends on 9)

The fill light device of claim 9, wherein the light guide comprises a first polarizer, a liquid crystal layer, and a second polarizer arranged in sequence, the light guide is connected to a liquid crystal driving module, and the liquid crystal driving module is configured to control an orientation of a liquid crystal of the liquid crystal layer to change the light-transmitting area of the fill light device.

### Claim 12 (depends on 9)

The fill light device of claim 9, wherein the light guide is connected to a deformation driving assembly, and the deformation driving assembly is configured to drive the light guide to deform to change the shape of the light guide.

### Claim 13 (depends on 12)

The fill light device of claim 12, wherein the deformation driving assembly comprises magnets, a coil, and a driving ring, the driving ring is configured to surround the light guide, the coil is configured to surround the driving ring, the magnets located on opposite sides of the driving ring, and the driving ring is driven to push up the light guide for deformation when the coil is energized.

### Claim 14 (depends on 9)

The fill light device of claim 9, wherein when the preview image is turned on, the flash light is controlled to pre-flash at a preset power for a preset number of times or to continue lighting, the preset power is less than the power when the flash light is flashing.

### Claim 15 (depends on 1)

A non-transitory computer readable storage medium, wherein a computer program instruction is stored on the non-transitory computer readable storage medium, the computer program instruction, when executed by a processor, implements the method for controlling the fill light device of claim 1.