Image display apparatus, image signal processing method, program for implementing the method, and storage medium storing the program

• US 8,212,743 B2
• Filed: 08/20/2009
• Issued: 07/03/2012
• Est. Priority Date: 06/03/2004
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Matsumoto, Toshiyuki
• Primary Examiner(s): Agustin, Peter Vincent
• Application Number:
  US12/544,708
• Publication Number:
  US 20090309807A1
• Time in Patent Office: 1,048 Days
• Field of Search: None
• US Class Current: 345/3.1
• CPC Class Codes: G06F 3/1431 using a single graphics controller
• 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 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2340/0492 Change of orientation of the displayed image, e.g. upside-down, mirrored
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

An image display apparatus which is capable of optimizing the image quality of a plurality of display devices having different optical characteristics when carrying out processing of an image signal supplied to the display devices, without providing a dedicated display driving circuit for each display device. The image display apparatus comprises a plurality of liquid crystal display panels (10, 11) having different optical characteristics. A liquid crystal driving circuit (2) processes an image signal outputted to the liquid crystal display panels (10, 11). Operative states of the liquid crystal display panels (10, 11) are detected. At least one processing characteristic of the liquid crystal driving circuit (2) is changed according to the detected operative states.

Claims

1. An image display apparatus comprising:

a setting value holding unit that holds a plurality of setting values;

a common display driving unit that processes an image signal based on the held plurality of setting values, which determine a processing characteristic of said common display driving unit, and outputs the processed image signal to a plurality of display devices;

a detecting unit that detects operative states of said plurality of display devices;

a selecting unit that selects one of the held plurality of setting values according to the detected operative states; and

a changing unit that changes the processing characteristic of said common display driving unit by setting the selected one held setting value to said common display driving unit.

2. An image display driving apparatus according to claim 1, further comprising a plurality of display devices having different optical characteristics.

3. An image display apparatus as claimed in claim 2, wherein:

said detecting unit comprises an open-close detecting unit that detects an open-close state of a predetermined one of said display devices, and

said changing unit changes the processing characteristic of said common display driving unit based on the detected open-close state.

4. An image display apparatus as claimed in claim 2, wherein:

said detecting unit comprises a rotation detecting unit that detects an rotational state of a predetermined one of said display devices, and

said changing unit changes the processing characteristic of said common display driving unit based on the detected rotational state.

5. An image display apparatus as claimed in claim 2, wherein said detecting unit comprises an open-close detecting unit that detects an open-close state of a predetermined one of said display devices, a rotation detecting unit that detects a rotational state of said predetermined display device, and a control unit that controls display operations of said display devices based on the detected open-close state and rotational state.

6. An image display apparatus as claimed in claim 1, further comprising:

a switching unit that switches an image quality-prioritizing in which priority is given to an image quality of an image to be displayed on one of said plurality of display devices,

wherein said changing unit comprises a second selecting unit that selects a setting value from the held setting values, according to the switching of said switching unit.

7. An image display apparatus as claimed in claim 1, wherein the processing characteristic of said common display driving unit that is changed by said changing unit comprises at least one characteristic selected from the group consisting of brightness, contrast, gamma, and white balance of the image signal.

8. An image display apparatus as claimed in claim 1, wherein:

said plurality of display devices comprise a first display device and a second device, and

the plurality of setting values comprise at least two setting values selected from the group consisting of a first setting value that is most suitable for optical characteristics of the first display device, a second setting value that is most suitable for optical characteristics of the second display device, and a third setting value that is an approximately middle value of the first and second setting values.

9. An image display apparatus as claimed in claim 8, wherein the plurality of setting values further comprise at least one setting value selected from the group consisting of a fourth setting value that is closer to the first setting value with respect to the approximately middle value, and a fifth setting value that is closer to the second setting value with respect to the approximately middle value.

10. An image display apparatus as claimed in claim 8, wherein:

the first display device is provided on the image display apparatus that enables the first display device to be freely opened and closed and freely rotated relative to the image display apparatus, and the second display device is fixed to the image display apparatus, and

the image display apparatus further comprises a control unit that controls display operations of the first display device and the second display device, based on an open-close state and a rotational state of the first display device.

11. An image display apparatus as claimed in claim 8, wherein said plurality of display devices comprise liquid crystal display panels.

12. An image signal processing method of processing an image signal supplied to a plurality of display devices having different optical characteristics, using a common display driving unit that processes an image signal based on a plurality of setting values that determine a processing characteristic of the common display driving unit, and outputs the processed image signal to the plurality of display devices, the method comprising:

a setting value holding step of holding the plurality of setting values in a setting value holding unit;

a detecting step of detecting operative states of the plurality of display devices; and

a selecting step of selecting one of the held plurality of setting values according to the detected operative states; and

a changing step of changing the processing characteristic of the common display driving unit by setting the selected one setting value to the common display driving unit.

13. A non-transitory computer-readable storage medium storing a program executable by a computer to execute an image signal processing method of processing an image signal supplied to a plurality of display devices having different optical characteristics, using a common display driving unit that processes an image signal based a plurality of setting values that determine a processing characteristic of the common display driving unit, and outputs the processed image signal to the plurality of display devices, the program comprising:

a setting value holding module for holding the plurality of setting values in a setting value holding unit;

a detecting module for detecting operative states of the plurality of display devices;

a selecting module for selecting one of the held plurality of setting values according to the detected operative states; and

a changing module for changing the processing characteristic of the common display driving unit by setting the selected one setting value to the common display driving unit.