Driver circuit for display device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsJun Koyama, Ritsuko Suzuki
Life of this patent
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Abstract
A driver circuit for use in an active matrix display having switching devices at pixels. The driver circuit uses no shift registers. Random access to signal lines or scanning lines can be obtained. The display quality is improved. The production yield is improved. Also, lower electric power consumption and higher-speed operation can be accomplished. Data about gray levels assumes the form of digital values and is supplied to the driver circuit. The signal lines or scanning lines are selected by an address decoder circuit.
Claims4
A driver circuit for use with an active matrix liquid crystal display having switching devices at pixels, said active matrix liquid crystal display having signal lines and scanning lines, said driver circuit receiving data about gray levels, said data being represented in terms of digital values, said driver circuit comprising:
- an address decoder circuit for selecting desired ones from said signal lines and said scanning lines.
A driver circuit for use with an active matrix liquid crystal display, said active matrix liquid crystal display having signal lines and scanning lines, said driver circuit receiving data about gray levels, said data being represented in terms of digital values, said driver circuit comprising:
- an address decoder circuit for selecting signal lines to which said data about gray levels is sent;
- a gray level-holding circuit for holding said data about gray levels;
- a gray level-synchronizing circuit for synchronizing timing at which said held data is sent with timing of scanning of said liquid crystal device;
- and
- a decoder circuit for selecting gray-level potentials to be sent to said signal lines according to said data synchronized by said gray level-synchronizing circuit.
A driver circuit for use with an active matrix liquid crystal display, said active matrix liquid crystal display having signal lines and scanning lines, said driver circuit receiving data about gray levels, said data being represented in terms of digital values, said driver circuit comprising:
- an address decoder circuit for selecting signal lines to which said data about gray levels is sent;
- a gray level-holding circuit for holding said data about gray levels in synchronism with an output signal from said address decoder circuit;
- a gray level-synchronizing circuit for synchronizing timing at which said held data is sent with timing of scanning of said liquid crystal display;
- and
- a decoder circuit for selecting gray-level potentials to be sent to said signal lines according to said data synchronized by said gray level-synchronizing circuit.
A driver circuit for use with an active matrix liquid crystal display, said active matrix liquid crystal display having signal lines and scanning lines, said driver circuit receiving data about gray levels, said data being represented in terms of digital values, said driver circuit comprising:
- an address decoder circuit for selecting signal lines to which said data about gray levels is sent;
- a gray level-holding circuit for holding said data about gray levels;
- a gray level-synchronizing circuit for synchronizing timing at which said held data is sent with timing of scanning of said liquid crystal display;
- and
- a decoder circuit for selecting one from a plurality of gray-level potential signals having different voltage values for different gray levels according to said data synchronized by said gray level-synchronizing circuit.
Dependencies are inferred from the claim text.