US 6,856,308 B2Granted

Image display apparatus

AssigneeHitachi, Ltd.

InventorsHajime Akimoto, Yoshiro Mikami, Toshio Miyazawa

Life of this patent

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Abstract

An image display apparatus having a display unit composed of a plurality of pixels and a control unit for controlling the display unit. The image display apparatus further includes a DA converter for converting digital display data into an analog image signal, wherein the DA converter is composed of a first DA converter and a second DA converter, the power consumption when the first DA converter is operated being smaller than that when the second DA converter is operated. Either of the first DA converter or the second DA converter are operated according to an instruction from the control unit, and the converted analog image signal is outputted to the display unit. The display unit changes the number of the independent display pixels of said display unit according to the instruction from the control unit and displays an image according to the analog image signal.

Claims26

Dependent claims

An image display apparatus having a display unit comprised of a plurality of pixels and a control unit for controlling the display unit, further comprising:

a DA converter to convert the digital display data into an analog image signal,
wherein said DA converter is comprised of a first DA converter and a second DA converter, each of the first and second DA converters being connected to said display unit separately from one another so that said first DA converter and said second DA converter can respectively supply an output to the display unit independently of one another, power consumption when said first DA converter is operated being smaller than that when said second DA converter is operated,
wherein said DA converter operates one of said first DA converter and said second DA converter according to the instruction from said control unit, and outputs the converted analog image signal from said one of said first and second DA converters to said display unit independently of the other of the first and the second DA converters, and
wherein said display unit changes the number of the independent display pixels of said display unit according to the instruction from said control unit, and displays according to said analog image signal.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 09/888,644Filed 26 Jun 2001
Priority: JP 2000-20144229 Jun 2000
Published: US 2002/0000970 A13 Jan 2002
Granted: 15 Feb 2005
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

G09G 3/3648
Control of matrices with row and column drivers: using an active matrix
G09G 3/3688
Details of drivers for data electrodes: suitable for active matrices only
G09G 3/20
Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes: for presentation of an…
G09G 3/32
Using electroluminescent panels: semiconductive, e.g. using light-emitting diodes [LED]