Display panel driving apparatus

• US 20060022905A1
• Filed: 08/01/2005
• Published: 02/02/2006
• Est. Priority Date: 08/02/2004
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Pioneer Corporation
• Inventors: Sasaki, Mikio, Yuasa, Toyohisa
• Granted Patent: US 7,586,486 B2
• Time in Patent Office: Days
• US Class Current: 345/60
• CPC Class Codes: G09G 2330/025 Reduction of instantaneous peaks of current
• CPC Class Codes: G09G 3/2965 using inductors for energy recovery

Abstract

A display panel driving apparatus which reduces a peak value of a voltage/current upon charging or discharging of discharging cells on a display panel. The apparatus has a pulse generating part for supplying a driving pulse to a capacitive light-emitting device arranged in each of crossing positions of a plurality of row electrode pairs and column electrodes on the display panel of the display panel driving apparatus. The pulse generating circuit includes a charge/discharge resonance circuit for executing charging and discharging to the capacitive light-emitting devices through an inductor, and a harmonic multiplexing circuit for multiplexing a harmonic current having a harmonic frequency of a resonance frequency of the charge/discharge resonance circuit to a charge/discharge current by the charge/discharge resonance circuit.

Claims

1. A display panel driving apparatus comprising:

a display panel constructed by a plurality of row electrode pairs, a plurality of column electrodes arranged so as to cross said row electrode pairs, and capacitive light-emitting devices arranged in crossing positions of said row electrode pairs and said column electrodes; and

a pulse generating part for supplying a driving pulse to each of said capacitive light-emitting devices,

wherein said pulse generating part includes

a charge/discharge resonance circuit for executing charging and discharging to said capacitive light-emitting devices through an inductor and

a harmonic multiplexing circuit for multiplexing a harmonic current having a harmonic frequency of a resonance frequency of said charge/discharge resonance circuit to each of a charge current and a discharge current by said charge/discharge resonance circuit.

2. An apparatus according to claim 1, wherein said harmonic multiplexing circuit includes a reactance device unit connected to said inductor in parallel.

3. An apparatus according to claim 2, wherein said reactance device unit is a series circuit of an inductor and a capacitor which decide said harmonic frequency.

4. An apparatus according to claim 1, wherein said harmonic multiplexing circuit includes a reactance device unit serially connected to said inductor.

5. An apparatus according to claim 4, wherein said reactance device unit is a parallel circuit of the inductor and a capacitor which decide said harmonic frequency.

6. An apparatus according to claim 1, wherein said harmonic frequency is an odd harmonic of said resonance frequency.

7. An apparatus according to claim 6, wherein said harmonic frequency is a third harmonic of said resonance frequency.