# US 10,319,312 B2 · In-vehicle rear-view display system and display method

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- Number: US 10,319,312 B2
- Document ID: US10319312B2
- Status: Granted
- Kind: B2
- Application number: 15/207,300
- Filed: 2016-07-11
- Published: 2017-08-03
- Granted: 2019-06-11
- Earliest claimed: 2016-02-02
- Assignees: Boe Technology Group Co., Ltd.; Beijing Boe Optoelectronics Technology Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.; Beijing Boe Optoelectronics Technology Co., Ltd.
- Inventors: Pengcheng Lu; Xiaochuan Chen; Wenqing Zhao; Lei Wang; Ming Yang; Qian Wang; Rui Xu; Jian Gao; Xiaochen Niu; Haisheng Wang; Changfeng Li; Peizhi Cai
- Web page: https://patentgrep.com/patent/US10319312B2

## CPC

- G09G 3/3413: {Details of control of colour illumination sources}
- B60R 1/088: {using a cell of electrically changeable optical characteristic, e.g. liquid-crystal or electrochromic mirrors}
- B60R 1/12: Mirror assemblies combined with other articles, e.g. clocks
- G02F 1/133528: {Polarisers}
- G06F 3/013: {Eye tracking input arrangements (G06F3/015 takes precedence)}
- G09G 3/36: using liquid crystals
- B60R 2001/1253: {with cameras, video cameras or video screens}
- G02F 1/133302: {Rigid substrates, e.g. inorganic substrates}
- G02F 1/153: Constructional details
- G02F 2201/44: Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
- G09G 2320/064: by time modulation of the brightness of the illumination source
- G09G 2320/0666: for control of colour parameters, e.g. colour temperature
- G09G 2340/0492: Change of orientation of the displayed image, e.g. upside-down, mirrored
- G09G 2354/00: Aspects of interface with display user
- G09G 2360/144: the light being ambient light
- G09G 2380/10: Automotive applications
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

An in-vehicle rear-view display system is described, comprising: a display device comprising a dimming device configured to adjust luminance of light emitted from the display device based on a color change of the dimming device; a first control unit connected with the dimming device and configured to control the color change of the dimming device in accordance with a luminance change of an irradiation light. By arranging in the display device a dimming device capable of adjusting the luminance of light emitted from the display device, the first control unit can control the color change of the dimming device in accordance with the luminance change of the ambient light, and thereby control the luminance of light emitted from the display device so as to preventing glare. Meanwhile, the poor clarity of the screen caused by an anti-glare screen film added to the screen of the display device is avoided.

## Claims

### Claim 1

An in-vehicle rear-view display system, comprising:
a display device comprising a dimming device configured to adjust luminance of light emitted from the display device based on a color change of the dimming device;
a first controller comprising hardware, the first controller being connected with the dimming device and configured to control the color change of the dimming device in accordance with a luminance change of an ambient light;
a photosensitive sensor arranged on a display side of the display device and configured to measure luminance of the ambient light;
a luminance calculator connected with the photosensitive sensor and configured to calculate, in response to determining that the luminance of the ambient light measured by the photosensitive sensor has changed, a luminance change amount of the ambient light and a time period Δt during which the luminance change amount of the ambient light is maintained;
wherein the first controller is configured to control, in accordance with the calculated luminance change amount and a corresponding relationship between luminance change amounts and color modes of the dimming device, the dimming device to be in a corresponding color mode in response to determining that an absolute value of the luminance change amount being greater than a preset luminance threshold and the time period Δt exceeds a preset time period T, and wherein the color modes of the dimming device are divided according to the luminance of light emitted by the dimming device.

### Claim 2 (depends on 1)

The display system according to claim 1, wherein the display device and the first controller are two independent devices, or the first controller is arranged inside the display device.

### Claim 3 (depends on 1)

The display system according to claim 1, wherein the first controller and the dimming device are connected via a wired or wireless connection.

### Claim 4 (depends on 1)

The display system according to claim 1, wherein the material of the dimming device is an electrochromic material.

### Claim 5 (depends on 4)

The display system according to claim 4, wherein the display device comprises an upper polarizing plate, an upper glass substrate, a liquid crystal layer, a lower glass substrate and a lower polarizing plate, and the dimming device is arranged between the upper polarizing plate and the upper glass substrate of the display device as an electrochromic layer.

### Claim 6 (depends on 1)

The display system according to claim 1, further comprising:
a visual tracking device configured to acquire an orientation of eyes of a viewer looking towards the display device;
a signal processor comprising hardware which is connected with the visual tracking device and configured to: determine a relative angle of the eyes with respect to the display device based on the orientation of the eyes acquired by the visual tracking device and a current position of the display device; determine an optimal angle of the display device for the viewer to currently view the display device according to the determined relative angle and a corresponding relationship between relative angles of the eyes with respect to the display device and optimal angles of the display device; determine an orientation and an angle in which the display device should be adjusted based on the determined optimal angle of the display device and the current position of the display device;
an adjusting device connected with the signal processor and configured to adjust the display device based on the orientation and the angle in which the display device should be adjusted as determined by the signal processor.

### Claim 7 (depends on 1)

The display system according to claim 1, further comprising:
a camera connected with the display device and configured to shoot and record a situation behind the vehicle.

### Claim 8 (depends on 7)

The display system according to claim 7, wherein the display device is further configured to display the situation behind the vehicle as shot by the camera.

### Claim 9 (depends on 7)

The display system according to claim 7, further comprising:
a second controller comprising hardware, the second controller being configured to control the camera and the display device to be turned on in response to determining the vehicle is in a start-up state; and control the camera to be turned off in response to determining the vehicle is in an ignition-off state.

### Claim 10 (depends on 7)

The display system according to claim 7, further comprising:
a third controller comprising hardware, the third controller being configured, in response to determining the vehicle is in an ignition-off state, to control the display device to be turned on if it is necessary for the display device to execute a display function, and control the display device to be turned off if not.

### Claim 11 (depends on 1)

The display system according to claim 1, further comprising:
a mirror arranged outside the vehicle and comprising another dimming device.

### Claim 12

A display method adapted for an in-vehicle rear-view display device comprising a dimming device, comprising:
in response to determining that a luminance of the ambient light has changed, determining a luminance change amount of the ambient light and a time period Δt for which the luminance change amount of the ambient light maintains;
controlling, in accordance with a value of the luminance change amount and a corresponding relationship between luminance change amounts and color modes of the dimming device, the dimming device to be in a corresponding color mode in response to determining that an absolute value of the luminance change amount is greater than a preset luminance threshold and the time period Δt exceeds a preset time period T, and wherein the color modes of the dimming device are divided according to the luminance of light emitted by the dimming device
adjusting luminance of light emitted from the display device based on the color mode of the dimming device.

### Claim 13 (depends on 12)

The display method according to claim 12, further comprising:
acquiring an orientation and an angle of the eyes of a viewer with respect to the display device;
determining an orientation and an angle in which the display device should be adjusted based on a preset optimal angle of the eyes of the viewer with respect to the display device and a current position of the display device;
adjusting the display device based on the determined orientation and angle in which the display device should be adjusted.