Display device

• US 20010006563A1
• Filed: 01/03/2001
• Published: 07/05/2001
• Est. Priority Date: 01/05/2000
• Status: Active Grant

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Taniguchi, Shinichi
• Granted Patent: US 6,781,602 B2
• Time in Patent Office: Days
• US Class Current: 382/275
• CPC Class Codes: G09G 2320/02 Improving the quality of display appearance
• CPC Class Codes: G09G 3/002 to project the image of a two-dimensional display, such as an array of light emitting or modulating elements or a CRT
• CPC Class Codes: H04N 2005/745 Control circuits therefor
• CPC Class Codes: H04N 5/74 Projection arrangements for image reproduction, e.g. using eidophor
• CPC Class Codes: H04N 5/7441 the modulator being an array of liquid crystal cells
• CPC Class Codes: H04N 9/28 Arrangements for convergence or focusing
• CPC Class Codes: H04N 9/3185 Geometric adjustment, e.g. keystone or convergence optical or mechanical adjustment of convergence H04N9/317; using scanning means H04N3/22; optical or mechanical adjustments of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/14

Abstract

A CPU comprises means for receiving, when image deformation processing by a digital circuit is terminated, the degree of image deformation at the time of the termination from the digital circuit and storing the received degree of image deformation in a nonvolatile memory, and means for causing, when an image deformed state is returned to an initial state before the deformation by turning the power of a display device on or off, for example, the digital circuit to subject an input image to the image deformation processing until the degree of image deformation stored in the nonvolatile memory is reached on the basis of the degree of image deformation stored in the nonvolatile memory.

Claims

1. In a display device comprising a digital circuit for subjecting an input image to image deformation processing, an operating unit for entering an image deformation command, a CPU into which the image deformation command from the operating unit is entered, and a nonvolatile memory controlled by the CPU, the CPU continuing to transmit, when the image deformation command from the operating unit continues to be entered, the image deformation command to the digital circuit, the digital circuit sequentially making calculation for image deformation when the image deformation command continues to be transmitted from the CPU, to perform the image deformation processing such that the degree of image deformation is gradually increased,

the CPU comprising

means for receiving, when the image deformation processing by the digital circuit is terminated, the degree of image deformation at the time of the termination from the digital circuit, and storing the received degree of image deformation in the nonvolatile memory, and

means for causing, when an image deformed state is returned to an initial state before the deformation by turning the power of the display device on or off, for example, the digital circuit to subject the input image to the image deformation processing until the degree of image deformation stored in the nonvolatile memory is reached on the basis of the degree of image deformation stored in the nonvolatile memory.

2. The display device according to

claim 1

, wherein the digital circuit subjects the input image to trapezoidal distortion correction processing,

the degree of image deformation being the amount of trapezoidal distortion.

3. The display device according to

claim 1

, wherein the digital circuit subjects the input image to image enlargement/reduction processing,

the degree of image deformation being the rate of image enlargement at the time of enlarging the image, while being the rate of image reduction at the time of reducing the image.

4. In a display device comprising a digital circuit for subjecting an input image to image deformation processing, an operating unit for entering an image deformation command, a control circuit into which the image deformation command from the operating unit is entered, and a nonvolatile memory controlled by the control circuit, the control circuit continuing to transmit, when the image deformation command from the operating unit continues to be entered, the image deformation command to the digital circuit, the digital circuit sequentially making calculation for image deformation when the image deformation command continues to be transmitted from the control circuit, to perform the image deformation processing such that the degree of image deformation is gradually increased,

the control circuit comprising

a circuit for receiving, when the image deformation processing by the digital circuit is terminated, the degree of image deformation at the time of the termination from the digital circuit, and storing the received degree of image deformation in the nonvolatile memory, and

a circuit for causing, when an image deformed state is returned to an initial state before the deformation by turning the power of the display device on or off, for example, the digital circuit to subject the input image to the image deformation processing until the degree of image formation stored in the nonvolatile memory is reached on the basis of the degree of image deformation stored in the nonvolatile memory.

5. The display device according to

claim 4

, wherein the digital circuit subjects the input image to trapezoidal distortion correction processing,

the degree of image deformation being the amount of trapezoidal distortion.

6. The display device according to

claim 4

, wherein the digital circuit subjects the input image to image enlargement/reduction processing,

the degree of image deformation being the rate of image enlargement at the time of enlarging the image, while being the rate of image reduction at the time of reducing the image.