# US 2019/0379874 A1 · Image display device and method of correcting image data

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- Number: US 2019/0379874 A1
- Document ID: US20190379874A1
- Status: Published application
- Kind: A1
- Application number: 16/433,882
- Filed: 2019-06-06
- Published: 2019-12-12
- Earliest claimed: 2018-06-08
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: HIROSHI HASEGAWA
- Web page: https://patentgrep.com/patent/US20190379874A1

## CPC

- H04N 13/125: for crosstalk reduction
- B60K 35/211: {producing three-dimensional [3D] effects, e.g. stereoscopic images}
- B60K 35/22: Display screens
- B60K 35/60: Instruments characterised by their location or relative disposition in or on vehicles (arrangements of lighting devices on dashboards B60Q3/10)
- H04N 5/58: in dependence upon ambient light
- H04N 13/302: for viewing without the aid of special glasses, i.e. using autostereoscopic displays
- H04N 13/398: Synchronisation thereof; Control thereof
- B60K 35/29: Instruments characterised by the way in which information is handled, e.g. showing information on plural displays or prioritising information according to driving conditions
- B60K 35/65: Instruments specially adapted for specific vehicle types or users, e.g. for left- or right-hand drive
- B60K 35/81: for controlling displays
- B60K 2360/199: for avoiding maloperation
- B60K 2360/29: Holographic features
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- 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

## Abstract

A liquid crystal display device which is an image display device for displaying a stereoscopic image includes two correction tables (a nighttime correction table and a daytime correction table) storing correction values corresponding to combinations of a gradation value of a processing target pixel and a gradation value of an adjacent pixel, a correction table selection unit configured to select one of the two correction tables depending on conditions, and gradation value correction units (a right-image gradation value correction unit and a left-image gradation value correction unit) configured to correct the gradation value of the processing target pixel based on the correction table selected by the correction table selection unit.

## Claims

### Claim 1

An image display device including a display unit including a plurality of right-eye pixels for displaying a right-eye image and a plurality of left-eye pixels for displaying a left-eye image, the image display device being for displaying a stereoscopic image based on image data including gradation values of a plurality of pixels including the plurality of right-eye pixels and the plurality of left-eye pixels, the image display device comprising:
a plurality of correction tables storing correction values corresponding to combinations of a gradation value of a processing target pixel and a gradation value of an adjacent pixel that is a pixel adjacent to the processing target pixel;
a correction table selection unit configured to select one correction table from the plurality of correction tables depending on conditions; and
a gradation value correction unit configured to take the plurality of pixels one by one as the processing target pixel, and to correct the gradation value of the processing target pixel based on the correction table selected by the correction table selection unit.

### Claim 2 (depends on 1)

The image display device according to claim 1, wherein
the plurality of correction tables include a first correction table and a second correction table, and
the first correction table and the second correction table correspond respectively to one and other of two methods of suppressing crosstalk at a time of display of the stereoscopic image on the display unit.

### Claim 3 (depends on 2)

The image display device according to claim 2, wherein
the first correction table stores a correction value such that a gradation value after correction becomes equal to or smaller than the gradation value before correction, a difference between the gradation value after correction and the gradation value before correction becomes relatively greater as the gradation value of the adjacent pixel becomes greater, and the difference between the gradation value after correction and the gradation value before correction becomes relatively greater as the gradation value of the processing target pixel becomes greater, and
the second correction table stores a correction value such that the gradation value after correction becomes equal to or greater than the gradation value before correction, the difference between the gradation value after correction and the gradation value before correction becomes relatively greater as the gradation value of the adjacent pixel becomes smaller, and the difference between the gradation value after correction and the gradation value before correction becomes relatively greater as the gradation value of the processing target pixel becomes smaller.

### Claim 4 (depends on 3)

The image display device according to claim 3, wherein
the image display device is mounted in a vehicle, and
the correction table selection unit selects the first correction table when a light of the vehicle is on, and selects the second correction table when the light of the vehicle is off.

### Claim 5 (depends on 3)

The image display device according to claim 3, wherein the correction table selection unit selects the first correction table during hours from sunset to sunrise, and selects the second correction table during hours from sunrise to sunset.

### Claim 6 (depends on 3)

The image display device according to claim 3, further comprising an illuminance detection unit configured to detect illuminance indicating surrounding brightness, wherein
the correction table selection unit selects the first correction table when the illuminance detected by the illuminance detection unit is smaller than a predetermined threshold, and selects the second correction table when the illuminance detected by the illuminance detection unit is greater than the predetermined threshold.

### Claim 7 (depends on 3)

The image display device according to claim 3, further comprising a screen luminance adjustment unit configured to adjust screen luminance indicating brightness of the display unit, wherein
the correction table selection unit selects the first correction table when the screen luminance is set by the screen luminance adjustment unit to a value smaller than a predetermined threshold, and selects the second correction table when the screen luminance is set by the screen luminance adjustment unit to a value greater than the predetermined threshold.

### Claim 8

A correction method for image data for displaying a stereoscopic image, the image data including gradation values of a plurality of pixels including a plurality of right-eye pixels for displaying a right-eye image and a plurality of left-eye pixels for displaying a left-eye image, the correction method comprising:
a correction table selection step of selecting, depending on conditions, one correction table from a plurality of correction tables storing correction values corresponding to combinations of a gradation value of a processing target pixel and a gradation value of an adjacent pixel that is a pixel adjacent to the processing target pixel; and
a gradation value correction step of taking the plurality of pixels one by one as the processing target pixel, and of correcting the gradation value of the processing target pixel based on the correction table selected in the correction table selection step.