Active matrix display device
AssigneeSanyo Electric Co., Ltd.
InventorsMakoto Kitagawa, Mitsugu Kobayashi, Makoto Fujioka
Life of this patent
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Abstract
This invention is directed to the active matrix display device with an imaging speed rapid enough for the moving image display and the small power consumption. The selector makes the switch between the moving image mode, where the image signal consecutively inputted is consecutively displayed after the certain processing is performed by the data processing unit and the still image mode, where the display is made based on the image signal stored in the frame memory. The messy display upon the switching between the modes can be prevented by differentiating the switching timing of the still to moving image mode from that of the moving to still image mode, improving the display quality.
Claims24
An active matrix display device comprising:
- a plurality of gate lines disposed in a direction;
- a plurality of data lines disposed in a direction different from the direction of the gate lines;
- a plurality of switching elements each disposed at corresponding intersections of the gate lines and the data lines;
- a plurality of pixel electrodes connected to corresponding switching elements so that a set of image signals can be supplied to the pixel electrodes from the data lines during a frame period,
- a plurality of pixels having corresponding pixel electrodes;
- a data processing unit receiving, processing and outputting the set of the image signals for displaying a moving image in a moving image mode;
- a memory holding the set of the image signals for displaying a still image in a still image mode;
- and
- a digital-analog converter performing a digital-to-analog conversion on the set of the image signals sent from the memory and supplying the converted image signals to the pixel electrodes.
An active matrix display device comprising:
- a plurality of gate lines disposed in a direction, each of the gate lines being consecutively selected based on a gate line clock;
- a plurality of data lines disposed in a direction different from the direction of the gate lines, each of the data lines being consecutively selected based on a data line clock;
- a plurality of switching elements each disposed at corresponding intersections of the gate lines and the data lines;
- a plurality of pixel electrodes connected to corresponding switching elements so that a set of image signals can be supplied to the pixel electrodes from the data lines during a frame period,
- a plurality of pixels having corresponding pixel electrodes;
- and
- a memory holding the set of the image signals for displaying a still image in a still image mode,
- wherein the display of the still image starts immediately when a switching signal for switching from a moving image mode to the still image mode is received during the frame period by reading out an image signal from an address of the memory corresponding to one of the pixels provided with a pixel voltage when the switching signal is received.
A control device of an active matrix display device displaying a moving image or a still image in a frame period, the display device including pixels having corresponding pixel electrodes, a set of image signals being supplied to the pixel electrodes, the control device comprising:
- a data processing unit receiving, processing and outputting the set of the image signals for displaying the moving image;
- a memory holding the set of the image signals for displaying the still image;
- a digital-analog converter performing a digital-to-analog conversion on the set of the image signals sent from the memory and supplying the converted image signals to the pixel electrodes;
- and
- a switching device selecting the data processing unit or the memory.
A control device of an active matrix display device displaying a moving image or a still image in a frame period, the display device including pixels having corresponding pixel electrodes, a plurality of gate lines and a plurality of data lines, a set of image signals being supplied to the pixel electrodes, the control device comprising:
- a data processing unit receiving, processing and outputting the set of the image signals for displaying the moving image;
- a memory holding the set of the image signals for displaying the still image;
- a switching device selecting the data processing unit or the memory;
- and
- a timing controller outputting internal timing signals including an internal vertical synchronous signal outputted as a pulse for the frame period, a gate line clock for selecting one of the gate lines and a data line clock for selecting one of the data lines,
- wherein an image signal is read out form an address of the memory corresponding to a gate line and a data line which are selected when a switching signal for switching from the data processing unit to the memory is received so that the displaying of the still image starts immediately when the switching signal is received.
An active matrix display device comprising:
- a plurality of gate lines disposed in a direction;
- a plurality of data lines disposed in a direction different from the direction of the gate lines;
- a plurality of switching elements each disposed at corresponding intersections of the gate lines and the data lines;
- a plurality of pixel electrodes connected to corresponding switching elements so that an image signal can be supplied to the pixel electrodes from the data lines during a frame period,
- a plurality of pixels having corresponding pixel electrodes;
- a data processing unit receiving, processing and outputting the image signal for displaying a moving image in a moving image mode;
- and
- a memory holding the image signal for displaying a still image in a still image mode,
- wherein a switching from the still image mode to the moving image mode is always made at an end of the frame period, and a switching from the moving image mode to the still image mode is made prior to the end of the frame period.
An active matrix display device comprising:
- a plurality of gate lines disposed in a direction, each of the gate lines being consecutively selected based on a gate line clock;
- a plurality of data lines disposed in a direction different from the direction of the gate lines, each of the data lines being consecutively selected based on a data line clock;
- a plurality of switching elements each disposed at corresponding intersections of the gate lines and the data lines;
- a plurality of pixel electrodes connected to corresponding switching elements so that an image signal can be supplied to the pixel electrodes from the data lines during a frame period,
- a plurality of pixels having corresponding pixel electrodes;
- and
- a memory holding the image signal for displaying a still image in a still image mode,
- wherein the still image mode starts immediately when a switching signal for switching from a moving image mode to the still image mode is received during the frame period by reading out an image signal from an address of the memory corresponding to one of the pixels provided with a pixel voltage when the switching signal is received,
- wherein a switching from the still image mode to the moving image mode is made at an end of the frame period, and a switching from the moving image mode to the still image mode is made during the frame period.
A control device of an active matrix display device displaying a moving image or a still image in a frame period, the display device including pixels having corresponding pixel electrodes, an image signal being supplied to the pixel electrodes, the control device comprising:
- a data processing unit receiving, processing and outputting the image signal for displaying the moving image;
- a memory holding the image signal for displaying the still image;
- and
- a switching device selecting the data processing unit or the memory,
- wherein a switching from the data processing unit to the memory is made prior to an end of the frame period, and a switching from the memory to the data processing unit is always made at the end of the frame period.
A control device of an active matrix display device displaying a moving image or a still image in a frame period, the display device including pixels having corresponding pixel electrodes, a plurality of gate lines and a plurality of data lines, an image signal being supplied to the pixel electrodes, the control device comprising:
- a data processing unit receiving, processing and outputting the image signal for displaying the moving image;
- a memory holding the image signal for displaying the still image;
- a switching device selecting the data processing unit or the memory;
- and
- a timing controller outputting internal timing signals including an internal vertical synchronous signal outputted as a pulse for the frame period, a gate line clock for selecting one of the gate lines and a data line clock for selecting one of the data lines,
- wherein an image signal is read out form an address of the memory corresponding to a gate line and a data line which are selected when a switching signal for switching from the data processing unit to the memory is received, and the memory is selected immediately when the switching signal is received, and
- wherein a switching from the memory to the data processing unit is always made at an end of the frame period, and the switching from the data processing unit to the memory is made prior to the end of the frame period.
Dependencies are inferred from the claim text.