Image display device and control method thereof

• US 9,336,746 B2
• Filed: 02/19/2014
• Issued: 05/10/2016
• Est. Priority Date: 02/25/2013
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Oda, Shinya
• Primary Examiner(s): Sajous, Wesner
• Application Number:
  US14/183,880
• Publication Number:
  US 20140240341A1
• Time in Patent Office: 811 Days
• US Class Current: 1/1
• CPC Class Codes: G09G 2320/028 by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 2340/14 Solving problems related to the presentation of information to be displayed
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/36 using liquid crystals
• 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

Abstract

An image display device is provided in which a difference in color appearance between visual angles can be reduced. The image display device includes: a light-emitting unit including a first light source configured such that a peak wavelength of a spectral spectrum of the light source is within a wavelength region in which a difference between color matching functions of different visual angles is small and a second light source that differs from the first light source; a control unit configured to switch a light source to be lighted to one of the first light source and the second light source based on an instruction; and a display panel that is illuminated by the light-emitting unit.

Claims

1. An image display device comprising:

a light-emitting unit including a first light source and a second light source;

a setting unit configured to set a display mode of the image display device to any one of a plurality of display modes;

a control unit configured to control to light the first light source based on the display mode set by the setting unit and to control to light the second light source based on the display mode set by the setting unit; and

a display panel that is illuminated by the light-emitting unit,

wherein a difference between color matching functions of plural visual angles in a peak wavelength of a spectrum of the first light source is smaller than that of the second light source, and

wherein the control unit is configured to light the first light source in a case where the setting unit sets a first display mode for suppressing a difference in color appearance between the plural visual angles.

2. The image display device according to claim 1, wherein a color gamut which is determined on the display panel by lighting the second light source is wider than a color gamut which is determined on the display panel by lighting the first light source, and

wherein the control unit is configured to light the second light source in a case where the setting unit sets a second display mode for prioritizing color reproducibility on the display panel.

3. An image display device comprising:

a light-emitting unit including a first light source and a second light source;

an analyzing unit configured to analyze a color distribution of an image displayed on the display panel;

a control unit configured to control to light the first light source based on the color distribution analyzed by the analyzing unit and to control to light the second light source based on the color distribution analyzed by the analyzing unit; and

a display panel that is illuminated by the light-emitting unit,

wherein a color gamut which is determined on the display panel by lighting the second light source is wider than a color gamut which is determined on the display panel by lighting the first light source,

wherein a difference between color matching functions of plural visual angles in a peak wavelength of a spectrum of the first light source is smaller than that of the second light source, and

wherein in a case where the color distribution of the image analyzed by the analyzing unit is not included in the color gamut which is determined on the display panel by lighting the first light source, the control unit is configured to light the second light source.

4. The image display device according to claim 3, wherein in a case where the color distribution of the image analyzed by the analyzing unit is included in the color gamut which is determined on the display panel by lighting the first light source, the control unit is configured to light only the first light source.

5. An image display device comprising:

a light-emitting unit including a first light source and a second light source;

a display panel that is illuminated by the light-emitting unit;

an acquiring unit configured to acquire a user'"'"'s color matching function; and

a control unit configured to control to light the first light source and to control to light the second light source,

wherein a peak wavelength of a spectrum of the first light source is different from that of the second light source, and

wherein the control unit is configured to adjust the spectrum of light emitted by the light-emitting unit on the basis of a difference between the user'"'"'s color matching function and a predetermined standard color matching function by adjusting an emission intensity ratio of the first light source and the second light source.

6. The image display device according to claim 5, wherein the control unit adjusts an emission intensity ratio of the first and second light sources so that a stimulus value calculated using the standard color matching function when light is emitted from the first and second light sources at a predetermined emission intensity ratio and a stimulus value calculated using the user'"'"'s color matching function when light is emitted from the first and second light sources at the adjusted emission intensity ratio become approximately the same.

7. The image display device according to claim 5, wherein a light emitted by the first light source and a light emitted by the second light source are different with respect to color, and

wherein the control unit calculates a deviation in peak wavelengths between the user'"'"'s color matching function and the standard color matching function for the color, and adjusts the emission intensity ratio so that a peak of a spectrum of the color shifts by an amount corresponding to the calculated deviation in peak wavelengths from a peak when light is emitted from the first light source and the second light source at a predetermined emission intensity ratio.

9. The image display device according to claim 5, wherein a light emitted by the first light source and a light emitted by the second light source are different with respect to color, and

wherein the control unit adjusts the spectrum by adjusting an emission intensity ratio of the first light source and the second light source for the color.

8. An image display device comprising:

a light-emitting unit that emits light;

a control unit configured to control to light the light-emitting unit;

a display panel that is illuminated by the light-emitting unit; and

an acquiring unit for acquiring color matching functions of a plurality of users,

wherein the control unit is configured to adjust a peak wavelength of the spectrum of the light emitted by the light-emitting unit to a wavelength at which a variation among the color matching functions of the plurality of users is small.