Image display device and image adjustment method

• US 9,494,847 B2
• Filed: 08/29/2013
• Issued: 11/15/2016
• Est. Priority Date: 09/01/2009
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Katahira, Toru
• Primary Examiner(s): Sajous, Wesner
• Application Number:
  US14/013,736
• Publication Number:
  US 20130342817A1
• Time in Patent Office: 1,174 Days
• US Class Current: 1/1
• CPC Class Codes: G03B 21/142 Adjusting of projection optics
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 3/34 by control of light from an independent source
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607
• CPC Class Codes: H04N 21/4122 additional display device, e.g. video projector digital output for controlling a plurality of local displays G06F3/1423
• CPC Class Codes: H04N 21/42202 environmental sensors, e.g. for detecting temperature, luminosity, pressure, earthquakes
• CPC Class Codes: H04N 21/4318 by altering the content in the rendering process, e.g. blanking, blurring or masking an image region image enhancement or restoration in general G06T5/00
• CPC Class Codes: H04N 5/58 in dependence upon ambient light
• CPC Class Codes: H04N 9/3182 Colour adjustment, e.g. white balance, shading or gamut white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607
• CPC Class Codes: H04N 9/3194 including sensor feedback

Abstract

An image display device includes: an external light measurement unit measuring the illuminance of an external light a plurality of times, and generating a measurement value indicating the illuminance; a storage unit storing history data which shows the measurement values, and color mode data which shows a correspondence between the illuminance and a color mode; a determination unit, based on the history data, determining whether or not it is a changed condition wherein the illuminance changes upward or downward, or the illuminance fluctuates; and an adjustment unit, in the event that it is not the changed condition, determining the color mode to be applied based on the measurement values and the color mode data, and adjusting the color or brightness of an image in accordance with the color mode, and in the event that it is the changed condition, continuing the adjustment currently being applied as the image adjustment.

Claims

1. An image display device comprising:

an external light measurement unit that measures the illuminance of an external light a plurality of times, and generates a measurement value indicating the illuminance;

a storage unit that stores history data showing a plurality of the measurement values;

a determination unit that, based on the history data, determines whether or not it is a changed condition indicating a condition wherein the illuminance fluctuates; and

an adjustment unit that, in the event that the determination unit determines that it is not the changed condition, determines a color mode to be applied based on the measurement values, and in the event that the determination unit determines that it is the changed condition, keeps the currently applied color mode.

2. The image display device according to claim 1, wherein

the adjustment unit adjusts the color or brightness of the image in accordance with the color mode.

3. The image display device according to claim 1, wherein

the storage unit stores hysteresis data showing a change value that changes a minimum value or maximum value of the illuminance corresponding to the color mode;

and

the adjustment unit, based on the hysteresis data, determines the color mode to be applied.

4. The image display device according to claim 1, wherein

the determination unit determines that it is a condition wherein the illuminance fluctuates in a case in which the value of a difference between a minimum value and maximum value of the measurement values in the predetermined number of measurements is equal to or higher than a first predetermined value.

5. The image display device according to claim 1, comprising:

an operating unit, wherein

the external light measurement unit is disposed adjacent to the operating unit.

6. An image adjustment method for an image display device, comprising:

using an illuminance sensor to measure the illuminance of an external light a plurality of times, and generating a measurement value indicating the illuminance;

storing history data showing a plurality of the measurement values;

determining, based on the history data, whether or not it is a changed condition indicating a condition wherein the illuminance fluctuates; and

in the event that it is not the changed condition, setting the color mode of the image display device based on the measurement values, and in the event that it is the changed condition, keeping a currently applied color mode.