Back to results
US 2002/0158858 A1Published application
Display device
AssigneeSanyo Electric Co., Ltd.
InventorYusuke Tsutsui
Life of this patent
Estimating the term…
Abstract
A display device, under a digital display mode, performs writing of digital image signals into a static memory circuit while a power voltage of about 3V is applied to the static memory with a panel drive frequency reduced from 60 Hz to 20-30 Hz. It is thus possible to output the digital image signal from a frame memory directly to a liquid crystal display panel without using a level shifter.
Claims6
A display device comprising:
- a display panel;
- an image memory outputting a digital image signal;
- a plurality of pixel elements disposed in the display panel;
- a plurality of static memory circuits disposed corresponding to the pixel elements;
- and
- a panel drive circuit supplying a panel drive signal for controlling a timing of writing the digital image signal into the static memory circuits,
- wherein an image is displayed based on the digital image signal retained in the static memory circuits, and the digital image signal is written into the static memory circuits from the image memory by reducing a frequency of the panel drive signal without using a level-shifter for raising a level of the digital image signal.
4 more elements
A display device comprising:
- a display panel;
- an image memory outputting a digital image signal;
- a DA converter converting the digital image signal outputted from the image memory into an analog image signal;
- a signal selection element selecting the analog image signal from the DA converter or the digital image signal outputted from the image memory, the selected signal being supplied to the display panel;
- a timing control circuit supplying a panel drive signal to the display panel;
- a plurality of pixel elements disposed in the display panel;
- a plurality of first display circuits disposed corresponding to the pixel elements and displaying an analog image in response to the analog image signal inputted based on the panel drive signal;
- and
- a plurality of second display circuits disposed corresponding to the pixel elements and displaying a digital image in response to the digital image signal, each of the second display circuits having a static memory circuit which receives the digital image signal based on the panel drive signal,
- wherein the first display circuit or the second display circuit is selected for displaying the analog image or the digital image, respectively, and the timing control circuit reduces a frequency of the panel drive signal so that the digital image signal is written into the static memory circuit from the image memory without using a level-shifter for raising a level of the digital image signal.
7 more elements
A method of displaying a digital image signal on a display device comprising:
- providing a display panel;
- providing an image memory outputting a digital image signal;
- providing a plurality of pixel elements disposed in the display panel;
- providing a plurality of static memory circuits disposed the corresponding to the pixel elements;
- supplying a panel drive signal controlling a timing of writing the digital image signal into the static memory circuits from a panel drive circuit;
- writing the digital image signal into the static memory circuits from the image memory by reducing a frequency of the panel drive signal without using a level-shifter for raising a level of the digital image signal;
- and
- displaying an image based on the digital image signal retained in the static memory circuits.
5 more elements
Dependencies are inferred from the claim text.