Liquid crystal display device
AssigneesJapan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.
InventorTaku Saito
Life of this patent
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Abstract
A liquid crystal display device that is used in a small portable device includes a driver circuit which is freely mounted because the mounting area is small. The liquid crystal display device includes a liquid crystal display element and the liquid crystal driver circuit. The liquid crystal driver circuit is mounted along one side of a liquid crystal display panel. The liquid crystal display panel is connected to a flexible printed circuit board mounted with a rewritable memory element. The memory element stores transition commands for various modes of the driver circuit. The driver circuit reads a transition command from the memory element using a simple command and executes a transition of any of the various modes to another one.
Claims9
A liquid crystal display device comprising:
- a first substrate and a second substrate;
- a liquid crystal composition sandwiched between the first and second substrates;
- a plurality of pixel electrodes arranged in the first substrate;
- a plurality of switching elements that each supply a video signal to the corresponding pixel electrode;
- a plurality of video signal lines for supplying the video signals to the switching elements;
- a plurality of scanning signal lines for supplying scanning signals for controlling the switching elements;
- a first driver circuit that outputs the video signals;
- and
- a second driver circuit that outputs the scanning signals, wherein
- the first and second driver circuits are formed on a single semiconductor chip,
- the liquid crystal display has a plurality of display modes that are driven by the first and second driver circuits,
- a control program for controlling the first and second driver circuits is stored in a memory element separated from the single semiconductor chip which the first and second driver circuits are formed on, and
- the control program includes command sequences, each comprised of a plurality of commands, for changing one of the display modes to another one of the display modes,
- the first and second driver circuits are coupled to receive the command sequences from the memory element and configured to execute the command sequences for changing the display mode.
A liquid crystal display device comprising:
- a first substrate and a second substrate;
- a liquid crystal composition sandwiched between the first and second substrates;
- a plurality of pixel electrodes arranged in the first substrate;
- a plurality of switching elements that each supply a video signal to the corresponding pixel electrode;
- a plurality of video signal lines for supplying the video signals to the switching elements;
- a plurality of scanning signal lines for supplying scanning signals for controlling the switching elements;
- a first driver circuit that outputs the video signals;
- and
- a plurality of second driver circuits that output the scanning signals, wherein
- the first and second driver circuits are formed on a single semiconductor chip,
- the liquid crystal display has a plurality of display modes that are driven by the first and second driver circuits,
- a control program for controlling the first and second driver circuits is stored in a memory element separated from the single semiconductor chip which the first and second driver circuits are formed on,
- the control program includes command sequences, each comprised of a plurality of commands, for changing one of the display modes to another one of the display modes, and
- the memory element is coupled to the first and second driver circuit so that the control program controls the number of scanning signal lines driven by the second driver circuits.
A liquid crystal display device comprising:
- a first liquid crystal display panel and a second liquid crystal display panel;
- a first driver circuit that supplies video signals to the first and second liquid crystal display panels;
- and
- a second driver circuit that supplies scanning signals to the first and second liquid crystal display panels, wherein
- the first and second driver circuits are formed on a single semiconductor chip,
- the liquid crystal display has a plurality of display modes that are driven by the first and second driver circuits,
- a control program for controlling the first and second driver circuits is stored in a memory element separated from the single semiconductor chip which the first and second driver circuits are formed on,
- the control program includes command sequences, each comprised of a plurality of commands, for changing one of the display modes to another one of the display modes, and
- the memory element is coupled to the first and second driver circuit so that the second driver circuit is switched between a first mode in which the first liquid crystal display panel is driven and a second mode in which the second liquid crystal display panel is driven in accordance with the control program.
Dependencies are inferred from the claim text.