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US 7,397,472 B2Granted
Active matrix display device
AssigneesHitachi, Ltd., Hitachi Device Engineering Co., Ltd.
InventorsToshio Miyazawa, Iwao Takemoto, Atsushi Hasegawa, Masahiro Maki, Kazutaka Goto
Life of this patent
Estimating the term…
Abstract
A display device includes a dynamic ratio less shift register which is operated in a stable manner and can expand the degree of freedom of design. In the dynamic ratio less shift register which is provided with thin film transistors having semiconductor layers made of p-Si on a substrate surface, a node which becomes the floating state is connected to a fixed potential through a capacitance element.
Claims9
A display device comprising:
- a display panel;
- a display driving circuit including a shift register formed above the display panel, the shift register including:
- a connection of a plurality of stages,
- at least one of the stages including a first transistor, a second transistor, the first transistor including a gate electrode, a first electrode and a second electrode;
- wherein a voltage of the gate electrode of the first transistor is boosted by a voltage of the first electrode thereof changing from a low level to high level,
- wherein the second transistor forms a connection between the control electrode and a ground voltage line when the second transistor is in an on state, and
- wherein the second transistor of a stage is turned off in response to an output signal from a preceding stage of the shift register.
4 more elements
A display device comprising:
- a display panel;
- and
- a display driving circuit including a shift register formed on the display panel, the shift register including:
- a connection of a plurality of stages,
- at least one stage including a first transistor and a second transistor,
- the first transistor including a control electrode, an input electrode and an output electrode, and being adapted to have a voltage of the control electrode boosted by a clock pulse inputted into the input electrode thereof, and
- the second transistor being adapted to release restriction of a fluctuation of the voltage of the control electrode an output of a preceding stage,
- wherein said at least one stage of the shift register outputs a low level voltage to the display panel when the first transistor thereof is in the off state, and
- wherein the second transistor of a stage is turned off by an output of a preceding stage.
6 more elements
A display device comprising:
- a display panel;
- and
- a display driving circuit including a shift register formed on the display panel, the shift register including a con nection of a plurality of stages, at least one stage including a first transistor, a second transistor and a third transistor, the first transistor including a control electrode, an input electrode and an output electrode,
- wherein a clock signal line is connected to the input electrode to input a clock signal to the input electrode,
- wherein the voltage of the control electrode of the first transistor is boosted when the clock signal is changing from low voltage to high voltage,
- wherein the second transistor connects the control electrode of the first transistor with a fixed voltage when the second transistor is in an on state,
- wherein the third transistor holds the second transistor in the on state until the first transistor is triggered to the on state,
- wherein said at least one stage of the shift register outputs a low level voltage to the display panel when the first transistor thereof is in the off state, and
- wherein the second transistor of a stage is turned off by an output of a preceding stage.
6 more elements
Dependencies are inferred from the claim text.