Driving method of display apparatus

• US 20040227720A1
• Filed: 03/04/2004
• Published: 11/18/2004
• Est. Priority Date: 03/05/2003
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Yoshinaga, Hideki, Shikina, Noriyuki, Mori, Hideo, Goden, Tatsuhito
• Granted Patent: US 7,439,949 B2
• Time in Patent Office: Days
• US Class Current: 345/107
• CPC Class Codes: G09G 2300/08 Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 2320/0204 Compensation of DC component across the pixels in flat panels
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 3/344 based on particles moving in a fluid or in a gas, e.g. electrophoretic devices electrophoretic devices per se G02F1/167

Abstract

A display apparatus includes a matrix display panel including scanning lines and signal lines disposed so as to form pixels each at an intersection of the scanning and signal lines, and a drive circuit for applying a voltage to the scanning and signal lines, the drive circuit generates a signal voltage depending on an image data inputted externally and applies the signal voltage to the signal lines while sequentially applying a selection voltage to the scanning line to effect writing of an image in the display panel. The drive circuit has a correction function of correcting a signal voltage depending on an image data in current image writing, at the time of image writing to the display panel, on the basis of a signal voltage in preceding image writing and an elapsed time from the preceding image writing, thereby to apply the corrected signal voltage to the signal lines.

Claims

1. A display apparatus, comprising:

a matrix display panel including scanning lines and signal lines disposed so as to form pixels each at an intersection of the scanning and signal lines, and

a drive circuit for applying a voltage to the scanning and signal lines, said drive circuit generating a signal voltage depending on an image data inputted externally and applying the signal voltage to the signal lines while sequentially applying a selection voltage to the scanning line to effect writing of an image in said display panel,

wherein said drive circuit has a correction function of correcting a signal voltage depending on an image data in current image writing, at the time of image writing to said display panel, on the basis of a signal voltage in preceding image writing and an elapsed time from the preceding image writing, thereby to apply the corrected signal voltage to the signal lines.

2. An apparatus according to claim 1, wherein the signal voltage depending on an image data inputted externally comprises a reset voltage and a writing voltage, and said drive circuit corrects a reset voltage in current image writing on the basis of a signal voltage in preceding image writing and an elapsed time from the preceding image writing.

3. An apparatus according to claim 2, the reset voltage is corrected so that a DC voltage component effectively applied to a pixel at the time of completion of application of the reset voltage is substantially constant.

4. A driving method of a display apparatus according to claim 3, wherein the corrected reset voltage is a sum of a minimum pulse voltage capable of initializing a display state from an arbitrary gradation level and a voltage which is set so that a DC voltage component effectively applied to a display device portion at the time of image writing is substantially constant.

5. An apparatus according to claim 1, wherein the signal voltage depending on the externally inputted image data comprises a reset voltage and a writing voltage, and the drive circuit corrects a writing voltage in current image writing on the basis of a signal voltage in preceding image writing and an elapsed time from the preceding image writing.

6. An apparatus according to claim 5, wherein the writing voltage is corrected so that a DC voltage component effectively applied to a pixel at the time of completion of application of the writing voltage is substantially constant.

7. A driving method of a display apparatus according to claim 6, wherein the corrected writing voltage is a sum of a writing voltage determined depending on the externally inputted image data and a voltage which is set so that a DC voltage component effectively applied to a display device portion at the time of image writing is substantially constant.

8. An apparatus according to claim 1, wherein said drive circuit includes a circuit for memorizing the signal voltage applied to the signal lines at the time of image writing in at least a period until subsequent image writing is effected.

9. An apparatus according to claim 1, wherein said drive circuit includes a circuit for measuring the elapsed time from the preceding image writing.

10. An apparatus according to claim 1, wherein the signal voltage in preceding image writing is a signal voltage in immediately preceding image writing.

11. An apparatus according to claim 1, wherein the signal voltage in preceding image writing is a signal voltage in image writing of preceding N times (N≧

2).

12. An apparatus according to claim 1, wherein a display state of said display panel is determined depending on a polarity of a voltage applied to pixels.

13. A driving method of a display apparatus which comprises a matrix display panel including scanning lines and signal lines disposed so as to form pixels each at an intersection of the scanning and signal lines, and a drive circuit for applying a voltage to the scanning and signal lines;

said driving method comprising;

a step of generating a signal voltage depending on an image data inputted externally in the drive circuit, and

a step of effecting image writing to the display panel by applying the signal voltage to the signal lines while sequentially applying a selection voltage to the scanning line to effect writing of an image in said display panel, to said display panel,

wherein such an image writing step includes a step of correcting a signal voltage in current image writing, at the time of image writing to said display panel, with reference to a signal voltage in preceding image writing and an elapsed time from the preceding image writing; and

a a step applying the corrected signal voltage to the signal lines.