US 2007/0176951 A1Published application

Display control device

AssigneeToshiba Matsushita Display Technology Co., Ltd.

InventorHirofumi Kato

Life of this patent

Estimating the term…

Loading patent…

Abstract

When the horizontal period is less than a lower limit threshold value in a state that an LCD panel is driven in an SVGA mode, a mode judging circuit judges the resolution of an image signal as VGA. When the horizontal period is above an upper limit threshold value in a state that the LCD panel is driven in a VGA mode, the mode judging circuit judges the resolution of the image signal as SVGA. Even when frequency modulation is applied to the input signal, the modulation is absorbed by the width between the lower limit threshold value and the upper limit threshold value, whereby the resolution of the image signal can be reliably judged. A control signal generating circuit controls the timing of driving the LCD panel in accordance with the resolution, whereby image signals of a plurality of different resolutions can be reliably displayed on the LCD panel.

Claims5

Dependent claims

A display control device comprising:

detecting means for detecting a horizontal period of a synchronous signal contained in an input signal from an external source;
judging means for judging the resolution corresponding to an image signal contained in the input signal on the basis of the horizontal period detected by the detecting means;
and
control means for controlling the timing of a display device in connection with the resolution judged by the judging means, wherein
when the horizontal period is less than a predetermined lower limit threshold value in a state that the display device is driven in connection with a first resolution, the judging means judges the resolution of the image signal as a second resolution lower than the first resolution, and when the horizontal period is above a predetermined upper limit threshold value larger than the lower limit threshold value in a state that the display device is driven in connection with the second resolution, the judging means judges the resolution of the image signal as the first resolution.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/699,360Filed 30 Jan 2007
Priority: JP 2006-02318031 Jan 2006
Published: 2 Aug 2007
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G09G 5/005
Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto: adapting…
G09G 2310/061
Details of flat display driving waveforms: for resetting or blanking
G09G 2340/0421
Resolution change, inclusive of the use of different resolutions for different screen areas: horizontal resolution change
G09G 2360/02
Aspects of the architecture of display systems: graphics controller able to handle multiple formats, e.g. input or output formats