US 2003/0146708 A1 · Multiplex anode driver circuit and fluorescent display device

Abstract

A multiplex anode driver circuit is provided that enables a reduced RAM capacity, an improved speed, and slimmed hardware. The multiplex anode driver circuit outputs anode data in sync with the timing when two adjacent grids are sequentially scanned in the direction of a row of anodes. The anode driver circuit has the shift register allocated with an even-numbered grid timing and the shift register allocated with an odd-numbered grid timing, in a two system. In the shift register, the registers are connected to the latch circuits, which hold anode data of the registers. In the shift register, the registers are connected to the latch circuits which hold anode data of the registers. The blanking input to the latch circuit associated with the shift register and the blanking input to the latch circuit associated with the shift register are released alternatively while the even-numbered grid timing and the odd-numbered grid timing are selected. Thus, anode data is transferred to the memory.

Claims4

Dependent claims

A multiplex anode driver circuit for a fluorescent display device comprising:

shift registers formed of a first shift register being allocated to an even-numbered grid timing and to an odd numbered grid timing when grids are scanned and second shift register being allocated to odd numbered grid timing when grids are scanned;
a first group of latch circuits respectively connected to registers in said first shift register, each for holding anode data of a corresponding register, and a second group of latch circuits respectively connected to registers in said second shift register, each for holding anode data of a corresponding register;
and
a memory for storing anode data to be input to said shift register;
wherein while blanking input to said first group of latch circuits associated said first shift register and blanking input to said second group of latch circuits associated said second shift register are being alternately released, the odd-numbered grid timing and the even-numbered grid timing are selected for permitting anode data to transfer from said memory.

2 more elements

Dependencies are inferred from the claim text.

Multiplex anode driver circuit and fluorescent display device

Life of this patent

Multiplex anode driver circuit and fluorescent display device

Life of this patent

Abstract

Claims4