# US 10,770,030 B2 · Projection display device, projection control method, and projection control program

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- Number: US 10,770,030 B2
- Document ID: US10770030B2
- Status: Granted
- Kind: B2
- Application number: 16/116,870
- Filed: 2018-08-29
- Published: 2019-01-10
- Granted: 2020-09-08
- Earliest claimed: 2016-03-01
- Assignees: FUJIFILM Corporation
- Applicants: FUJIFILM Corporation
- Inventors: Hiroyuki Oshima
- Web page: https://patentgrep.com/patent/US10770030B2

## CPC

- G09G 5/10: Intensity circuits
- B60K 35/10: Input arrangements, i.e. from user to vehicle, associated with vehicle functions or specially adapted therefor
- B60K 35/234: controlling the brightness, colour or contrast of virtual images depending on the driving conditions or on the condition of the vehicle or the driver
- B60K 35/53: Movable instruments, e.g. slidable
- B60K 35/654: {the user being the driver}
- G02B 27/01: Head-up displays
- G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)}
- G09G 3/002: {to project the image of a two-dimensional display, such as an array of light emitting or modulating elements or a CRT}
- G09G 3/02: by tracing or scanning a light beam on a screen
- H04N 9/3141: {Constructional details thereof (details not peculiar to the presence of an electronic spatial light modulator G03B21/14)}
- B60K 35/22: Display screens
- B60K 2360/334: Projection means
- B60K 2360/66: Projection screens or combiners
- G02B 2027/0112: {comprising device for genereting colour display}
- G02B 2027/0118: {comprising devices for improving the contrast of the display / brillance control visibility}
- G02B 2027/0123: {comprising devices increasing the field of view}
- G02B 2027/014: {comprising information/image processing systems}
- G09G 2320/0666: for control of colour parameters, e.g. colour temperature
- G09G 2360/145: the light originating from the display screen
- G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data
- 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)
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A projection display device has a projection display unit that performs, in accordance with input image data, spatial modulation on light emitted by a light source, and projects image light obtained through the spatial modulation onto a projection surface of a vehicle to display an image that is based on the image data, the projection surface is formed of a member having a reflectance that is higher for light in a plurality of wavelength ranges than for light in a wavelength range outside the plurality of wavelength ranges, and the projection display device includes: a projection angle control mechanism that controls a projection angle of the image light on the projection surface; and an image light control unit that controls, in accordance with the projection angle, intensity of the light in the plurality of wavelength ranges included in the image light.

## Claims

### Claim 1

A projection display device having a projection display unit that performs, in accordance with input image data, spatial modulation on light emitted by a light source, and projects image light obtained through the spatial modulation onto a projection surface of a vehicle to display an image that is based on the image data,
the projection surface being formed of a member having a reflectance that is higher for light in a plurality of wavelength ranges than for light in a wavelength range outside the plurality of wavelength ranges,
the projection display device comprising:
a rotation angle control mechanism comprising an actuator that controls a rotation angle of the image light on the projection surface; and
a processor, being configured to function as
an image light control unit that controls, in accordance with the rotation angle, amount of intensity of the light in the plurality of wavelength ranges included in the image light,
wherein the image light control unit controls the amount of intensity of the light in the plurality of wavelength ranges included in the image light in accordance with control information for the amount of intensity, the control information being stored in a storage medium and corresponding to the rotation angle controlled by the rotation angle control mechanism,
wherein the image light control unit controls the amount of intensity by obtaining parameters related with relation between the rotation angle and the amount of intensity.

### Claim 2 (depends on 1)

The projection display device according to claim 1, wherein
the amount of intensity is brightness,
the projection display unit comprises a plurality of light sources each of which emits light in respective one of the plurality of wavelength ranges,
the control information stored in the storage medium is amount-of-light control information for an amount of light emitted by the light sources each of which emits light in respective one of the plurality of wavelength ranges, and
the image light control unit controls the amount of intensity by controlling the amount of light emitted by each of the plurality of light sources in accordance with the amount-of-light control information.

### Claim 3 (depends on 2)

The projection display device according to claim 2, wherein
the control information stored in the storage medium is RGB colors as wavelength ranges and adjusting the amount of intensity of light is actually about adjusting each of the RGB components.

### Claim 4 (depends on 1)

The projection display device according to claim 1, wherein
the amount of intensity is lightness and brightness,
the projection display unit comprises a plurality of light sources each of which emits light in respective one of the plurality of wavelength ranges,
the control information stored in the storage medium comprises amount-of-light control information for an amount of light emitted by the light sources each of which emits light in respective one of the plurality of wavelength ranges and lightness control information for lightness of each of colors in the plurality of wavelength ranges of the image data, and
the image light control unit controls the amount of intensity by controlling the amount of light emitted by each of the plurality of light sources in accordance with the amount-of-light control information and controlling the lightness of each of the colors in the plurality of wavelength ranges included in the image data in accordance with the lightness control information.

### Claim 5 (depends on 4)

The projection display device according to claim 4, wherein
the control information stored in the storage medium is RGB colors as wavelength ranges and adjusting the amount of intensity of light is actually about adjusting each of the RGB components.

### Claim 6 (depends on 1)

The projection display device according to claim 1, further comprising:
an imaging device that detects light projected by the projection display unit and reflected by the projection surface; and
the processor, being configured to further function as
a control information generation unit that generates the control information in accordance with the light in the plurality of wavelength ranges detected by the light detection unit in a state where the rotation angle is controlled to each of a plurality of values by the rotation angle control mechanism and that stores, in the storage medium, the generated control information.

### Claim 7 (depends on 6)

The projection display device according to claim 6, wherein
the control information generation unit generates the control information and stores the generated control information in the storage medium in synchronization with a timing at which the vehicle is activated.

### Claim 8 (depends on 6)

The projection display device according to claim 6, wherein
the control information generation unit calculates, in accordance with the amount of intensity of the light in the plurality of wavelength ranges detected by the imaging device in a state where the rotation angle is controlled to each of the plurality of values, a function which represents a relationship between the rotation angle and the amount of intensity and in which the rotation angle is a variable, and generates, as the control information, an arithmetic expression for subtracting the function from a target value of the amount of intensity.

### Claim 9 (depends on 1)

The projection display device according to claim 1, wherein
the projection surface is formed of a member that has a visible light transmitting property and has a center wavelength of a reflection wavelength range in each of the plurality of wavelength ranges.

### Claim 10

A projection display device having a projection display unit that performs, in accordance with input image data, spatial modulation on light emitted by a light source, and projects image light obtained through the spatial modulation onto a projection surface of a vehicle to display an image that is based on the image data,
the projection surface being formed of a member having a reflectance that is higher for light in a plurality of wavelength ranges than for light in a wavelength range outside the plurality of wavelength ranges,
the projection display device comprising:
a rotation angle control mechanism comprising an actuator that controls a rotation angle of the image light on the projection surface; and
a processor, being configured to function as
an image light control unit that controls, in accordance with the rotation angle, amount of intensity of the light in the plurality of wavelength ranges included in the image light,
wherein the image light control unit causes the amount of intensity of the light in the plurality of wavelength ranges included in the image light to reach a target value that is based on the rotation angle after a predetermined period of time elapses from when a change in the rotation angle is completed.

### Claim 11 (depends on 10)

The projection display device according to claim 10, wherein
the image light control unit controls the period of time in accordance with a difference between the target value and the amount of intensity immediately before the rotation angle is changed.

### Claim 12 (depends on 10)

The projection display device according to claim 10, wherein
the projection surface is formed of a member that has a visible light transmitting property and has a center wavelength of a reflection wavelength range in each of the plurality of wavelength ranges.

### Claim 13

A projection control method for performing, in accordance with input image data, spatial modulation on light emitted by a light source, and projecting image light obtained through the spatial modulation onto a projection surface of a vehicle to display an image that is based on the image data,
the projection surface being formed of a member having a reflectance that is higher for light in a plurality of wavelength ranges than for light in a wavelength range outside the plurality of wavelength ranges,
the projection control method configured to perform functions comprising:
controlling a rotation angle of the image light on the projection surface; and
controlling, in accordance with the rotation angle, amount of intensity of the light in the plurality of wavelength ranges included in the image light,
wherein the amount of intensity of the light in the plurality of wavelength ranges included in the image light is controlled in accordance with control information for the amount of intensity, the control information being stored in a storage medium and corresponding to the rotation angle,
wherein the image light control unit controls the amount of intensity by obtaining parameters related with relation between the rotation angle and the amount of intensity.

### Claim 14 (depends on 13)

The projection control method according to claim 13, wherein
the amount of intensity is brightness,
the light source comprises a plurality of light sources each of which emits light in respective one of the plurality of wavelength ranges,
the control information stored in the storage medium is amount-of-light control information for an amount of light emitted by the light sources each of which emits light in respective one of the plurality of wavelength ranges, and
the amount of intensity is controlled by controlling the amount of light emitted by each of the plurality of light sources in accordance with the amount-of-light control information.

### Claim 15 (depends on 13)

The projection control method according to claim 13, wherein
the amount of intensity is lightness and brightness,
the light source comprises a plurality of light sources each of which emits light in respective one of the plurality of wavelength ranges,
the control information stored in the storage medium comprises amount-of-light control information for an amount of light emitted by the light sources each of which emits light in respective one of the plurality of wavelength ranges and lightness control information for lightness of each of colors in the plurality of wavelength ranges of the image data, and
the amount of intensity is controlled by controlling the amount of light emitted by each of the plurality of light sources in accordance with the amount-of-light control information and controlling the lightness of each of the colors in the plurality of wavelength ranges included in the image data in accordance with the lightness control information.

### Claim 16 (depends on 13)

The projection control method according to claim 13, further configured to perform functions comprising:
detecting light reflected by the projection surface; and
generating the control information in accordance with the light in the plurality of wavelength ranges in a state where the rotation angle is controlled to each of a plurality of values and storing, in the storage medium, the generated control information.

### Claim 17 (depends on 16)

The projection control method according to claim 16, wherein
the control information is generated and stored in the storage medium in synchronization with a timing at which the vehicle is activated.

### Claim 18 (depends on 16)

The projection control method according to claim 16, wherein
a function which represents a relationship between the rotation angle and the amount of intensity and in which the rotation angle is a variable is calculated in accordance with the amount of intensity of the light in the plurality of wavelength ranges in a state where the rotation angle is controlled to each of the plurality of values, and an arithmetic expression for subtracting the function from a target value of the amount of intensity is generated as the control information.

### Claim 19 (depends on 13)

The projection control method according to claim 13, wherein
the projection surface is formed of a member that has a visible light transmitting property and has a center wavelength of a reflection wavelength range in each of the plurality of wavelength ranges.

### Claim 20

A projection control method for performing, in accordance with input image data, spatial modulation on light emitted by a light source, and projecting image light obtained through the spatial modulation onto a projection surface of a vehicle to display an image that is based on the image data,
the projection surface being formed of a member having a reflectance that is higher for light in a plurality of wavelength ranges than for light in a wavelength range outside the plurality of wavelength ranges,
the projection control method configured to perform functions comprising:
controlling a rotation angle of the image light on the projection surface; and
controlling, in accordance with the rotation angle, amount of intensity of the light in the plurality of wavelength ranges included in the image light,
wherein the amount of intensity of the light in the plurality of wavelength ranges included in the image light is caused to reach a target value that is based on the rotation angle after a predetermined period of time elapses from when a change in the rotation angle is completed.

### Claim 21 (depends on 20)

The projection control method according to claim 20, wherein
the period of time is controlled in accordance with a difference between the target value and the amount of intensity immediately before the rotation angle is changed.

### Claim 22 (depends on 20)

The projection control method according to claim 20, wherein
the projection surface is formed of a member that has a visible light transmitting property and has a center wavelength of a reflection wavelength range in each of the plurality of wavelength ranges.

### Claim 23

A non-transitory computer readable medium storing a computer readable instructions to be loaded into a processor configured by the instructions to perform functions comprising, in accordance with input image data, spatial modulation on light emitted by a light source, and projecting image light obtained through the spatial modulation onto a projection surface of a vehicle to display an image that is based on the image data,
the projection surface being formed of a member having a reflectance that is higher for light in a plurality of wavelength ranges than for light in a wavelength range outside the plurality of wavelength ranges,
the computer readable instructions causing a computer to execute functions comprising:
controlling a rotation angle of the image light on the projection surface; and
controlling, in accordance with the rotation angle, amount of intensity of the light in the plurality of wavelength ranges included in the image light,
wherein the amount of intensity of the light in the plurality of wavelength ranges included in the image light is controlled in accordance with control information for the amount of intensity, the control information being stored in a storage medium and corresponding to the rotation angle,
wherein the image light control unit controls the amount of intensity by obtaining parameters related with relation between the rotation angle and the amount of intensity.

### Claim 24

A non-transitory computer readable medium storing a computer readable instructions to be loaded into a processor configured by the instructions to perform functions comprising, in accordance with input image data, spatial modulation on light emitted by a light source, and projecting image light obtained through the spatial modulation onto a projection surface of a vehicle to display an image that is based on the image data,
the projection surface being formed of a member having a reflectance that is higher for light in a plurality of wavelength ranges than for light in a wavelength range outside the plurality of wavelength ranges,
the computer readable instructions causing a computer to execute functions comprising:
controlling a rotation angle of the image light on the projection surface; and
controlling, in accordance with the rotation angle, amount of intensity of the light in the plurality of wavelength ranges included in the image light,
wherein the amount of intensity of the light in the plurality of wavelength ranges included in the image light is caused to reach a target value that is based on the rotation angle after a predetermined period of time elapses from when a change in the rotation angle is completed.