Display device, method of controlling same, computer program for controlling same, and computer program storage medium

• US 7,755,593 B2
• Filed: 02/15/2005
• Issued: 07/13/2010
• Est. Priority Date: 02/20/2004
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Takahashi, Toshiya, Yamamoto, Takeshi, Miake, Aki, Itoh, Megumi, Okuda, Mitsukazu, Doi, Takeshi
• Primary Examiner(s): Awad; Amr
• Assistant Examiner(s): SPAR, ILANA L
• Application Number:
  US10/598,102
• Publication Number:
  US 20070159410A1
• Time in Patent Office: 1,974 Days
• Field of Search: 345/1.3, 345/690, 345/207, 345/1.1, 345/102, 340/425.5
• US Class Current: 345/102
• CPC Class Codes: G09G 2300/026 Video wall, i.e. juxtaposition of a plurality of screens to create a display screen of bigger dimensions
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336

Abstract

A liquid crystal display device (100) includes mean value computing sections (9a, 9b) and an optical intensity regulation section (11). The mean value computing section (9a) outputs a mean luminance level (A1) for the pixels forming an image display produced in a driver seat display area (2). The mean value computing section (9b) outputs a mean luminance level (A2) for the pixels forming an image display produced in a front passenger seat display area (3). The optical intensity regulation section (11) controls (regulates) the output optical intensity of backlights (4a, 4b) according to the mean luminance level (A1) and the mean luminance level (A2). As a result, the luminance of the image display in the front passenger seat display area (3) is further limited than the luminance of the image display in the driver seat display area (2). The control ensures high visibility of image displays for the driver.

Claims

1. A display device mounted to a mode of transport comprising:

a first display area that is fixed with respect to the display device; and

a second display area that is fixed with respect to the display device, that is separate from the first display area, and that is closer to a position of an operator than is the first display area when the display device is mounted to the mode of transport;

a first luminance level output section arranged to output a first luminance level representing luminance of an image display produced in the first display area;

a second luminance level output section arranged to output a second luminance level representing luminance of an image display produced in the second display area; and

a luminance limiting section arranged to limit, according to the first luminance level and the second luminance level, the luminance of the image display produced in the first display area to be less than the luminance of the image display produced in the second display area;

wherein

the first and second display areas are provided on a transmissive liquid crystal display device with separate backlights for each of the display areas; and

the luminance limiting section regulates output optical intensity of at least one of the separate backlights, and the luminance level of the first display area is non-zero.

2. The display device as set forth in claim 1, wherein the first and second display areas are both provided on a single transmissive liquid crystal display device.

3. The display device as set forth in claim 1, further comprising:

a brightness detecting section arranged to sense brightness inside the mode of transport; and

an optical intensity regulation data correction section arranged to correct optical intensity regulation data according to an output of the brightness detecting section;

wherein

the luminance limiting section uses the optical intensity regulation data to regulate the output optical intensity of the separate backlights.