Apparatus and method for driving light emitting panel

• US 6,965,362 B1
• Filed: 06/13/2000
• Issued: 11/15/2005
• Est. Priority Date: 06/15/1999
• Status: Expired due to Fees

• Current Assignee: Pioneer Corporation
• Original Assignee: Pioneer Corporation
• Inventors: Ishizuka, Shinichi
• Primary Examiner(s): Wu, Xiao
• Assistant Examiner(s): Abdulselam, Abbas
• Application Number:
  US09/593,791
• Time in Patent Office: 1,981 Days
• Field of Search: 345/82, 345/74, 345/76, 345/77, 345/74.1, 345/36, 345/55, 315/169.1, 315/169.2, 315/169.4
• US Class Current: 345/82
• CPC Class Codes: G09G 2310/0254 Control of polarity reversal in general, other than for liquid crystal displays
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/3216 using a passive matrix

Abstract

An apparatus for driving a light emitting panel which selects one scanning line from a plurality of scanning lines, designates at least one drive line of a plurality of drive lines corresponding to at least one capacitive light emitting element driven to emit light on the one scanning line, applies the one scanning line with a first predetermined potential, applies scanning lines other than the one scanning line with a second predetermined potential higher than the first predetermined potential, supplies a driving current to the at least one line so as to apply the at least one capacitive light emitting element with a positive voltage equal to or higher than a light emission threshold voltage in the forward direction, and applies drive lines other than the at least one drive line with a third predetermined voltage lower than the light emission threshold voltage and higher than the first predetermined potential.

Claims

1. An apparatus for driving a light emitting panel including a plurality of drive lines and a plurality of scanning lines intersecting with each other, and a plurality of capacitive light emitting elements each having a polarity and connected between one of said scanning line and one of said drive line at an intersecting position of said one scanning line and said one drive line, said driving apparatus comprising:

control means for selecting one scanning line from said plurality of scanning lines in accordance with a scanning timing of an input video data, and for designating at least one drive line of said plurality of drive lines corresponding to at least one capacitive light emitting element driven to emit light on said one scanning line in accordance with said input video data;

means for applying said one scanning line with a first predetermined potential, and for applying scanning lines other than said one scanning line with a second predetermined potential higher than said first predetermined potential; and

means for supplying a driving current to said at least one drive line so as to apply said at least one capacitive light emitting element with a positive voltage equal to or higher than a light emission threshold voltage in a forward direction during a scanning period when the first predetermined potential is applied to said one scanning line, and for applying drive lines other than said at least one drive line with a third predetermined voltage lower than said light emission threshold voltage and higher than said first predetermined potential during the scanning period.

2. A driving apparatus according to claim 1, wherein said first predetermined potential is a ground potential, and said second predetermined potential is substantially equal to a light emission regulating voltage.

3. A driving apparatus according to claim 1, wherein said driving current is supplied from a current source.

4. A driving apparatus according to claim 1, wherein said capacitive light emitting elements are organic electroluminescence elements.

5. A method of driving a light emitting panel including a plurality of drive lines and a plurality of scanning lines intersecting with each other, and a plurality of capacitive light emitting elements each having a polarity and connected between one of said scanning line and one of said drive line at an intersecting position of said one scanning line and said one drive line, said driving method comprising the steps of:

selecting one scanning line from said plurality of scanning lines in accordance with a scanning timing of an input video data;

designating at least one drive line of said plurality of drive lines corresponding to at least one capacitive light emitting element driven to emit light on said one scanning line in accordance with said input video data;

applying said one scanning line with a first predetermined potential;

applying scanning lines other than said one scanning line with a second predetermined potential higher than said first predetermined potential;

supplying a driving current to said at least one drive line so as to apply said at least one capacitive light emitting element with a positive voltage equal to or higher than a light emission threshold voltage in the forward direction during a scanning period when the first predetermined potential is applied to said one scanning line; and

applying drive lines other than said at least one drive line with a third predetermined voltage lower than said light emission threshold voltage and higher than said first predetermined potential during the scanning period.