DISPLAY DEVICE
First Claim
Patent Images
1. A display device comprising:
- a display panel including a plurality of scanning lines each connected to a plurality of pixel formation portions, and a scanning line drive circuit configured to selectively drive the plurality of scanning lines;
a voltage generator circuit configured to receive supply of power from an external source, and generate one type of scanning line selection voltage and one type of scanning line non-selection voltage, the scanning line selection voltage being a voltage for bringing the scanning lines into a selected state, and the scanning line non-selection voltage being a voltage for bringing the scanning lines into a non-selected state; and
a drive control circuit configured to control operation of the scanning line drive circuit, using the scanning line selection voltage and the scanning line non-selection voltage generated by the voltage generator circuit, whereinthe scanning line drive circuit includes a shift register configured to perform shift operation based on a plurality of clock signals, the shift register including a plurality of unit circuits provided so as to have one-to-one correspondence with the plurality of scanning lines,each unit circuit includes;
an output node connected to a corresponding scanning line;
an output control transistor having a control terminal, a first conduction terminal to which one of the plurality of clock signals is provided, and a second conduction terminal connected to the output node;
an output control node connected to the control terminal of the output control transistor; and
a reset transistor having a control terminal to which a clear signal for initializing internal states of the plurality of unit circuits is provided;
a first conduction terminal connected to the output control node; and
a second conduction terminal to which a reference voltage is provided, the reference voltage being outputted from the drive control circuit and serving as a reference for operation of the scanning line drive circuit, andthe drive control circuit;
sets a voltage of each of the plurality of clock signals to the scanning line selection voltage and the scanning line non-selection voltage alternately and sets the reference voltage to the scanning line non-selection voltage, at normal times; and
sets the voltage of each of the plurality of clock signals and the reference voltage to the scanning line selection voltage and sets a voltage of the clear signal to less than or equal to a voltage of ground, when the supply of power stops.
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Accused Products
Abstract
When supply of power has stopped, voltages of GDM signals are set as follows. A clear signal that contributes to removal of charge at floating nodes (an output control node and a stabilization node) in each unit circuit included in a shift register is set to a voltage of ground, and other signals (a gate start pulse signal, gate clock signals, and a reference voltage) are set to a gate-on voltage. To implement such settings, a single power supply system configuration that uses a voltage of only one channel as a scanning line selection voltage is adopted.
11 Citations
8 Claims
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1. A display device comprising:
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a display panel including a plurality of scanning lines each connected to a plurality of pixel formation portions, and a scanning line drive circuit configured to selectively drive the plurality of scanning lines; a voltage generator circuit configured to receive supply of power from an external source, and generate one type of scanning line selection voltage and one type of scanning line non-selection voltage, the scanning line selection voltage being a voltage for bringing the scanning lines into a selected state, and the scanning line non-selection voltage being a voltage for bringing the scanning lines into a non-selected state; and a drive control circuit configured to control operation of the scanning line drive circuit, using the scanning line selection voltage and the scanning line non-selection voltage generated by the voltage generator circuit, wherein the scanning line drive circuit includes a shift register configured to perform shift operation based on a plurality of clock signals, the shift register including a plurality of unit circuits provided so as to have one-to-one correspondence with the plurality of scanning lines, each unit circuit includes; an output node connected to a corresponding scanning line; an output control transistor having a control terminal, a first conduction terminal to which one of the plurality of clock signals is provided, and a second conduction terminal connected to the output node; an output control node connected to the control terminal of the output control transistor; and a reset transistor having a control terminal to which a clear signal for initializing internal states of the plurality of unit circuits is provided;
a first conduction terminal connected to the output control node; and
a second conduction terminal to which a reference voltage is provided, the reference voltage being outputted from the drive control circuit and serving as a reference for operation of the scanning line drive circuit, andthe drive control circuit; sets a voltage of each of the plurality of clock signals to the scanning line selection voltage and the scanning line non-selection voltage alternately and sets the reference voltage to the scanning line non-selection voltage, at normal times; and sets the voltage of each of the plurality of clock signals and the reference voltage to the scanning line selection voltage and sets a voltage of the clear signal to less than or equal to a voltage of ground, when the supply of power stops. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification