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Display-control-device-for-reducing-power-consumption-of-display-units

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Details

Inventors: Ishikawa, Yasuo;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Oberley; Alvin E.
Assistant Examiner: Goon; Gin
Attorney, Agent or Firm: Wolf, Greenfield & Sacks

A display control device for receiving input data at a display controller-kernel unit, storing it in a memory, sequentially reading the stored data from the memory and displaying it on a display unit. The control device comprises a counter which is reset when a signal indicating writing of data in the memory is detected to output a counter signal when a predetermined value is counted, a display control circuit for outputting a control signal so as to close a gate inserted in a signal line between the display controller-kernel unit and the display unit in response to the counter signal to interrupt the signal line and turn off the backlight of the display unit, and means for invalidating the control signal when the fact that a signal is written in the memory is detected.

DETAILED DESCRIPTION The present invention has been made to solve such problems.
It is an object of the invention to provide a display device capable of reducing a power consumption of a display control device, by adding simple circuits thereto, when no data are required to be displayed.
To attain this purpose, the present invention, in one aspect, provides a display control device for causing input data to be stored in a memory to sequentially read the stored data for causing them to be displayed on a display unit, the device comprising: timer means for detecting the fact that no data is written in the memory for a predetermined period of time; and control means for disabling the display unit in response to the output of the timer means; whereby a power consumption of the display unit is reduced.
The timer means may be a counter which is reset in response to the writing of the data in the memory and provides an output signal when the counter has counted up to a value corresponding to the predetermined period of time.
The display control device according to the invention may further comprise gate means disposed in a signal path coupling the memory and the display unit, the control means being operable to close the gate means and disable the display unit in response to the signal output from the counter.
The display unit may be an LCD panel and the control means may be operable to turn off the backlight of the LCD panel.
According to another aspect of the invention, the present invention provides a display control device including a display controller for receiving input data, storing it in a memory, sequentially reading the data stored in the memory and transmitting it to a display unit, the device comprising: timer means for generating an output at the time when a predetermined period of time has lapsed from the time of the data being written in the memory; gate means disposed in a signal path coupling the display controller and the display unit; and control means for closing the gate means in response to the output of the timer means to disable the display unit, and for opening the gate means in response to the writing of the data in the memory to enable the display unit

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