Image display apparatus having deformation detection

• US 7,724,248 B2
• Filed: 10/14/2005
• Issued: 05/25/2010
• Est. Priority Date: 10/19/2004
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Saito, Akio
• Primary Examiner(s): Nguyen; Chanh
• Assistant Examiner(s): WALTHALL, ALLISON N
• Application Number:
  US11/249,401
• Publication Number:
  US 20060082565A1
• Time in Patent Office: 1,684 Days
• Field of Search: 345/74.1, 345/75.1, 345/75.2, 345/204, 345/214, 345 76- 78, 345/212, 315/169.3, 313/310, 313495-497
• US Class Current: 345/214
• CPC Class Codes: G09G 3/00 Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
• CPC Class Codes: G09G 3/03 specially adapted for displays having non-planar surfaces, e.g. curved displays
• CPC Class Codes: G09G 3/22 using controlled light sources
• CPC Class Codes: H01J 29/98 Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for
• CPC Class Codes: H01J 31/127 using large area or array sources, i.e. essentially a source for each pixel group

Abstract

An image display apparatus includes a display panel that displays an image, and a detecting unit that detects a magnitude of deformation of the display panel. In addition, a control unit controls display on the display panel according to an output of the detecting unit such that the magnitude of deformation of the display panel becomes equal to or smaller than a predetermined value.

Claims

1. An image display apparatus comprising:

a display panel that displays an image;

a detecting unit that detects a magnitude of deformation of the display panel;

a control unit that controls display on the display panel according to an output of the detecting unit such that the magnitude of deformation of the display panel becomes equal to or smaller than a predetermined value; and

a holding member, separate from the display panel, that holds the display panel, and is disposed to face the display panel,

wherein the detecting unit comprises;

a first electrode disposed on a side of the display panel that is facing the holding member; and

a second electrode disposed on the holding member and facing the first electrode, wherein the detecting unit detects the magnitude of deformation of the display panel by measuring a physical quantity corresponding to a distance between the first electrode and the second electrode, and wherein

the physical quantity is capacitance between the first electrode and the second electrode,

the magnitude of deformation of the display panel is calculated from a variation of the capacitance; and

the control unit changes a driving voltage or a driving pulse width for the display panel for controlling the display on the display panel.

2. An image display apparatus according to claim 1, wherein said display panel comprises a rear plate having an electron-emitter, a face plate having a metal back and a fluorescent film to be irradiated with electrons emitted from the electron-emitting device, and a frame member disposed between the face plate and the rear plate, with said driving voltage or said driving pulse being applied to said metal back or said electron emitter, and wherein the holding member is disposed opposite to the rear plate.

3. An image display apparatus according to claim 2, wherein the first electrode is disposed on a side of the rear plate that faces the holding member.

4. An image display apparatus comprising:

a display panel that displays an image;

a detecting unit that detects a magnitude of deformation of the display panel;

a control unit that controls display on the display panel according to an output of the detecting unit such that the magnitude of deformation of the display panel becomes equal to or smaller than a predetermined value; and

a protection plate, separate from the display panel, that protects the display panel, and is disposed to face the display side of the display panel;

wherein the detecting unit comprises;

a first electrode disposed in an invisible region on a side of the display panel that is facing the protection plate; and

a second electrode disposed on the protection plate and facing the first electrode, wherein the detecting unit detects the magnitude of deformation of the display panel by measuring a physical quantity corresponding to a distance between the first electrode and the second electrode, and wherein

the physical quantity is capacitance between the first electrode and the second electrode;

the magnitude of deformation of the display panel is calculated from a variation of the capacitance; and

the control unit changes a driving voltage or a driving pulse width for the display panel for controlling the display on the display panel.

5. An image display apparatus according to claim 4, wherein said display panel comprises a rear plate having an electron-emitter, a face plate having a metal back and a fluorescent film to be irradiated with electrons emitted from the electron-emitting device, and a frame member disposed between the face plate and the rear plate, with said driving voltage or said driving pulse being applied to said metal back or said electron emitter, and wherein the protection plate is disposed opposite to the rear plate.

6. An image display apparatus according to claim 5, wherein the first electrode is disposed on a side of the rear plate that faces the protection plate.

7. An image display apparatus comprising:

a display panel that displays an image;

a detecting unit that detects a magnitude of deformation of the display panel;

a control unit that controls display on the display panel according to an output of the detecting unit such that the magnitude of deformation of the display panel becomes equal to or smaller than a predetermined value; and

a protection plate, separate from the display panel, that protects the display panel, and is disposed to face the display side of the display panel,

wherein the detecting unit comprises;

a first transparent electrode disposed in a visible region on a side of the display panel that is facing the protection plate; and

a second transparent electrode disposed on the protection plate and facing the first transparent electrode, wherein the detecting unit detects the magnitude of a deformation of the display panel by measuring a physical quantity corresponding to a distance between the first transparent electrode and the second transparent electrode, and wherein

the physical quantity is capacitance between the first transparent electrode and the second transparent electrode;

the magnitude of deformation of the display panel is calculated from a variation of the capacitance; and

the control unit changes a driving voltage or a driving pulse width for the display panel for controlling the display on the display panel.

8. An image display apparatus according to claim 7, wherein said display panel comprises a rear plate having an electron-emitter, a face plate having a metal back and a fluorescent film to be irradiated with electrons emitted from the electron-emitting device, and a frame member disposed between the face plate and the rear plate, with said driving voltage or said driving pulse being applied to said metal back or said electron emitter, and wherein the protection plate is disposed opposite to the rear plate.

9. An image display apparatus according to claim 8, wherein the first electrode is disposed on a side of the rear plate that faces the protection plate.