IMAGE DISPLAY APPARATUS AND METHOD FOR CONTROLLING IMAGE DISPLAY APPARATUS

• US 20110187933A1
• Filed: 01/25/2011
• Published: 08/04/2011
• Est. Priority Date: 02/03/2010
• Status: Abandoned Application

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kawase, Daisuke, Sagano, Osamu, Mori, Makiko
• Application Number:
  US13/013,400
• Publication Number:
  US 20110187933A1
• Time in Patent Office: Days
• US Class Current: 348/607
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2330/02 Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 2330/026 Arrangements or methods related to booting a display
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: H04N 5/21 Circuitry for suppressing or minimising disturbance, e.g. moiré or halo

Abstract

An image display apparatus of the present invention includes: a display panel; a signal processing unit which corrects an input video signal using correction parameters, and outputs the corrected video signal to the display panel; a power supply unit which supplies voltage to the display panel; a storage unit which stores the correction parameters; and a control unit, which, at startup of the image display apparatus, executes boosting processing for boosting voltage supplied from the power supply unit to the display panel up to a voltage required for driving the display panel in stages, and transfer processing for transferring the correction parameters from the storage unit to the signal processing unit, wherein the transfer processing is processing for intermittently transferring the correction parameters using a period when boosting is not performed in the boosting processing.

Claims

1. An image display apparatus, comprising:

a display panel;

a signal processing unit which corrects an input video signal using correction parameters, and outputs the corrected video signal to the display panel;

a power supply unit which supplies voltage to the display panel;

a storage unit which stores the correction parameters; and

a control unit, which, at startup of the image display apparatus, executes boosting processing for boosting voltage supplied from the power supply unit to the display panel up to a voltage required for driving the display panel in stages, and transfer processing for transferring the correction parameters from the storage unit to the signal processing unit, wherein

the transfer processing is processing for intermittently transferring the correction parameters using a period when boosting is not performed in the boosting processing.

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

each of the correction parameters is composed of a plurality of data, and a length of the period when the boosting is not performed is set to a time required for transferring data which is supposed to be transferred using this period or longer.

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

after one of the boosting processing and the transfer processing completes first, the control unit continuously executes the other processing, and then completes this other processing.

4. The image display apparatus according to claim 1, wherein the transfer processing is performed using a direct memory access controller.

5. The image display apparatus according to claim 1, wherein

the display panel is a display panel having a rear plate which has a plurality of electron emitting devices, and a face plate which has a plurality of phosphors disposed facing the plurality of electron emitting devices, and

the power supply unit supplies voltage to the display panel so that a potential of the face plate side is higher than that of the rear plate side.

6. A method for controlling an image display apparatus having a display panel, a signal processing unit which corrects an input video signal using correction parameters, and outputs the corrected video signal to the display panel, a power supply unit which supplies voltage to the display panel, and a storage unit which stores the correction parameters, the method comprising:

a boosting step of boosting voltage supplied from the power supply unit to the display panel up to a voltage required for driving the display panel in stages, at the startup of the image display apparatus; and

a transfer step of transferring the correction parameters from the storage unit to the signal processing unit, wherein

the transfer step is a step of intermittently transferring the correction parameters using a period when boosting is not performed in the boosting step.