Method of controlling image display

• US 7,268,750 B2
• Filed: 09/13/2005
• Issued: 09/11/2007
• Est. Priority Date: 10/06/1998
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Yamazaki, Tatsuro, Isono, Aoji
• Primary Examiner(s): Shalwala; Bipin
• Assistant Examiner(s): DHARIA, PRABODH M
• Application Number:
  US11/226,821
• Publication Number:
  US 20060007069A1
• Time in Patent Office: 728 Days
• Field of Search: 345 741- 752, 345/60, 345/101, 345/87, 345/89, 345/84, 345/204, 345/102, 345/76, 345/11, 315/1, 315/205, 323/274, 313/495, 313/496, 348/14.01, 445/6
• US Class Current: 345/75.1
• CPC Class Codes: G09G 2310/027 Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
• CPC Class Codes: G09G 2310/0272 Details of drivers for data electrodes, the drivers communicating data to the pixels by means of a current
• 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 2330/04 Display protection
• CPC Class Codes: G09G 3/2011 by amplitude modulation
• CPC Class Codes: G09G 3/2014 by modulation of the duration of a single pulse during which the logic level remains constant
• CPC Class Codes: G09G 3/2081 with combination of amplitude modulation and time modulation space and time error diffusion G09G3/2066
• CPC Class Codes: G09G 3/22 using controlled light sources

Abstract

This invention discloses an arrangement for suppressing an erroneous display and suppressing damage to an image display apparatus when a power source is turned on, the power source is turned off, an outlet is removed, or power fails. Particularly, this invention discloses an arrangement for stopping, for a predetermined time, input of a scanning signal or modulation signal to a display panel or application of an accelerating potential in turning on the power source. This invention discloses an arrangement for stopping input of a scanning signal or modulation signal to the display panel, and then stopping supply of power in turning off the power source.

Claims

1. An image display apparatus control method comprising, when image display is to be started by outputting a signal from a modulation circuit to a display panel for displaying an image by irradiation with electrons from an electron source to fluorescent substances, delaying application of a predetermined acceleration potential for accelerating electrons from the electron source,

wherein said image display apparatus comprises

a processor unit,

a D/A converter which inputs a signal from said processor unit, and

a high voltage source which inputs a signal from said D/A converter and outputs the acceleration potential for accelerating electrons from the electron source,

wherein said modulation circuit has a shift register holding data for outputting the signal,

said processor unit outputs, to said D/A converter, a control signal for raising the potential to be outputted from said high voltage source to a predetermined potential when a predetermined time period has been elapsed after a power source was turned on, and determines the data to be stored in the shift register during the predetermined time period.

2. The image display apparatus control method according to claim 1, wherein the predetermined time period is a time during which a predetermined number of sync signals of image signals is counted.

3. The image display apparatus control method according to claim 1, wherein the electron source comprises a plurality of row-direction wiring lines for receiving a scanning signal, a plurality of column-direction wiring lines for receiving a modulation signal, and a plurality of electron-emitting devices connected to the row-direction wiring lines and the column-direction wiring lines.

4. An image display apparatus control method comprising, when image display is to be started by outputting a signal from a scanning circuit to a display panel for displaying an image by irradiation with electrons from an electron source to fluorescent substances, delaying application of a predetermined acceleration potential for accelerating electrons from the electron source,

wherein said image display apparatus comprises

a processor unit,

a D/A converter which inputs a signal from said processor unit, and

a high voltage source which inputs a signal from said D/A converter and outputs the acceleration potential for accelerating electrons from the electron source,

wherein said scanning circuit has a shift register holding data for outputting the signal,

said processor unit outputs, to said D/A converter, a control signal for raising the potential to be outputted from said high voltage source to a predetermined potential when a predetermined time period has been elapsed after a power source was turned on, and determines the data to be stored in the shift register during the predetermined time period.

5. The image display apparatus control method according to claim 4, wherein the predetermined time period is a time during which a predetermined number of sync signals of image signals is counted.

6. The image display apparatus control method according to claim 4, wherein the electron source comprises a plurality of row-direction wiring lines for receiving a scanning signal, a plurality of column-direction wiring lines for receiving a modulation signal, and a plurality of electron-emitting devices connected to the row-direction wiring lines and the column-direction wiring lines.