Scan driver and organic light emitting display device using the same
AssigneeLG Display Co., Ltd.
InventorsJunyoung Kwon, Jaeho Sim, Jungchul Kim, Euncheol Eom
Life of this patent
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Abstract
A circuit has a first portion configured to act as a shift register to provide an output signal via an output terminal, and a second portion configured to act as an inverter to invert the output signal at the output terminal of said first portion from a logic high state to a logic low state or vice versa. This is to forcibly turn off one or more transistors in a pixel circuit that provides subpixel or pixel-related control in an OLED display, such that an anode voltage of an organic light emitting diode does not exceed a turn-on voltage thereof.
Claims22
An organic light emitting display device, comprising:
- a display panel;
- a data driver that supplies a data signal to the display panel;
- and
- a scan driver that supplies a scan signal to the display panel,
- the scan driver comprising a shift register and an inverter that inverts a scan signal output through the output terminal of the shift register and outputs the inverted scan signal,
- wherein the shift register is connected to a gate-low voltage line, and the inverter is connected to a variable voltage line,
- wherein the shift register and the inverter do not share the gate-low voltage line;
- wherein the gate-low voltage line has a ground voltage potential or a reference voltage potential;
- and
- wherein the variable voltage line inverts voltage logical high and low states in response to changes in a power-on sequence.
A scan driver, comprising:
- a shift register;
- and
- an inverter that inverts a scan signal output through an output terminal of the shift register and outputs the inverted scan signal,
- wherein the shift register is connected to a gate-low voltage line, and the inverter is connected to a variable voltage line;
- wherein the shift register and the inverter do not share the gate-low voltage line;
- wherein the gate-low voltage line has a ground voltage potential or a reference voltage potential;
- and
- wherein the variable voltage line inverts voltage logical high and low states in response to changes in a power-on sequence.
A circuit comprising:
- a first portion configured to act as a shift register to provide an output signal via an output terminal;
- and
- a second portion configured to act as an inverter to invert the output signal at the output terminal of said first portion from a logic high state to a logic low state or vice versa, to turn off one or more transistors in a pixel circuit configured to provide subpixel or pixel-related control in an OLED display, such that an anode voltage of an organic light emitting diode does not exceed a turn-on voltage thereof,
- wherein said first and second portions, which are operatively connected as part of a scan driver, do not share a gate-low voltage line (VGL) having a ground voltage potential or a reference voltage potential;
- and
- wherein said first portion acting as the shift register is connected to the gate-low voltage line (VGL), and said second portion acting as the inverter is connected to a variable voltage line (VEL) which inverts voltage logical high and low states in response to changes in a power-on sequence.
Dependencies are inferred from the claim text.