Image display apparatus and image display method

• US 8,537,148 B2
• Filed: 03/09/2010
• Issued: 09/17/2013
• Est. Priority Date: 05/08/2009
• Status: Active Grant

• Current Assignee: Hisense Visual Technology Co., Ltd. (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Yamauchi, Himio
• Primary Examiner(s): SHENG, TOM V
• Application Number:
  US12/720,521
• Publication Number:
  US 20100283770A1
• Time in Patent Office: 1,288 Days
• Field of Search: 345/87, 345/89, 345/102, 345/204, 345/207, 345/690, 362/97.1, 362/97.2, 349/69, 349/70
• US Class Current: 345/207
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2320/062 Adjustment of illumination source parameters
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix

Abstract

According to one embodiment, an image display apparatus comprises a detector configured to detect an illuminance of surroundings, an upper and lower limit calculator configured to calculate an upper limit and a lower limit of luminance based on the detection result of the illuminance, a luminance calculator configured to calculate the luminance of each of light sources to display an image based on an input image signal in the range of the upper limit to the lower limit, a correction module configured to correct the input image signal based on the calculated luminance, a light emitter configured to emit light based on the calculated luminance, the light emitter includes the light sources, and a light modulator configured to display an image by modulating light from each of the light sources based on the corrected input image signal.

Claims

1. An image display apparatus comprising:

a detector configured to detect an illuminance of surroundings;

an attribute detector configured to detect an attribute of an input image signal;

an upper and lower limit calculator configured to calculate an upper limit and a lower limit of luminance based on the detected attribute and the detected illuminance, wherein the upper limit is a first upper limit when the detected attribute of the input image signal indicates that a signal is not converted from a film image and a second upper limit that is smaller than the first upper limit when the detected attribute of the input image signal indicates that a signal is converted from a film image;

a luminance calculator configured to calculate a luminance of each light source in a group of one or more light sources based on the input image signal, the luminance of each light source being in the range of the upper limit to the lower limit,

a correction module configured to correct the input image signal based on the calculated luminance;

a light emitter configured to emit light based on the calculated luminance, the light emitter comprising the group of light sources; and

a light modulator configured to display an image by modulating light from each of the light sources based on the corrected input image signal.

2. An image display apparatus comprising:

a detector configured to detect an illuminance of surroundings;

an attribute detector configured to detect an attribute of an input image signal;

an upper and lower limit calculator configured to calculate an upper limit and a lower limit of luminance based on the detected attribute and the detected illuminance, wherein the lower limit is a first lower limit when the detected attribute of the input image signal indicates that a signal is not converted from a film image and a second lower limit that is smaller than the first lower limit when the detected attribute of the input image signal indicates that a signal is converted from a film image;

a luminance calculator configured to calculate a luminance of each light source in a group of one or more light sources based on the input image signal, the luminance of each light source being in the range of the upper limit to the lower limit,

a correction module configured to correct the input image signal based on the calculated luminance;

a light emitter configured to emit light based on the calculated luminance, the light emitter comprising the group of light sources; and

a light modulator configured to display an image by modulating light from each of the light sources based on the corrected input image signal.

3. An image display apparatus comprising:

a detector configured to detect an illuminance of surroundings;

an attribute detector configured to detect an attribute of an input image signal;

an upper and lower limit calculator configured to calculate a ratio of an upper limit to lower limit of luminance based on the detected attribute and the detected illuminance, wherein the ratio is a first ratio of a first upper limit to a first lower limit when the detected attribute of the input image signal indicates that a signal is not converted from a film image and a second ratio of a second upper limit to a second lower limit when the detected attribute of the input image signal indicates that a signal is converted from a film image, the second ratio is lower than the first ratio;

a luminance calculator configured to calculate a luminance of each light source in a group of one or more light sources based on the input image signal, the luminance of each light source being in the range of the upper limit to the lower limit;

a correction module configured to correct the input image signal based on the calculated luminance;

a light emitter configured to emit light based on the calculated luminance, the light emitter comprising the group of light sources; and

a light modulator configured to display an image by modulating light from each of the light sources based on the corrected input image signal.