Organic light emitting display panel having a sensing transistor and method of driving thereof

Patent metadata

Field	Value
Publication number	US-10204565-B2
Application number	US-201615390151-A
Country	US
Kind code	B2
Filing date	Dec 23, 2016
Priority date	Dec 31, 2015
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

Disclosed are an organic light emitting display panel, an organic light emitting display device, and a method of driving the organic light emitting display device. The organic light emitting display panel, the organic light emitting display device, and the method of driving the organic light emitting display device having a subpixel structure and a gate line connection structure in which two types of scan transistors within each subpixel can be individually turned on and off and image driving and various types of sensing driving can be performed while the aperture ratio increases through the individual on and off of the scan transistors.

First claim

What is claimed is:

1. An organic light emitting display device, comprising:
an organic light emitting display panel including a plurality of subpixels, a plurality of data lines and a plurality of gate lines, the subpixels being arranged into rows and columns, each row of the subpixels corresponding to a respective gate line and each column corresponding to a respective data line;
a data driver for driving the plurality of data lines;
a gate driver for driving the plurality of gate lines; and
a controller for controlling the data driver and the gate driver,
wherein each of the subpixels includes:
an organic light emitting diode,
a driving transistor for driving the organic light emitting diode,
a switching transistor controlled by a scan signal applied to a gate node of the switching transistor, the switching transistor electrically connected between a first node of the driving transistor and a respective data line,
a sensing transistor controlled by a sensing signal applied to a gate node of the sensing transistor, the sensing transistor electrically connected between a second node of the driving transistor and a reference voltage line, and
a storage capacitor electrically connected between the first node and the second node of the driving transistor,

wherein the plurality of gate lines are each arranged on a respective subpixel row, and
an n+1 th gate line arranged on an n+1 th subpixel row is connected in common to the gate node of the switching transistor within each subpixel of the n+1 th subpixel row, and to the gate node of the sensing transistor within each subpixel of an n th subpixel row,
wherein the gate node of the switching transistor within each subpixel of the n th subpixel row receives an n th scan signal output through an n th gate line arranged on the n th subpixel row, and the gate node of the sensing transistor within each subpixel of the n th subpixel row receives an n+1 th scan signal output through the n+1 th gate line arranged on the n+1 th subpixel row as an n th sensing signal,
wherein, in an afterimage compensation mode for the n th subpixel row, while the n th scan signal is output with a turned-on level voltage, the n+1 th scan signal is changed into and output with the turned-on level voltage, and then is output with a turned-off level voltage, and, when the n th scan signal is changed into and output with the turned-off level voltage, the n+1 th scan signal is output with the turned-on level voltage,
wherein n is a natural number greater than zero.

2. The organic light emitting display device of claim 1 , wherein, in an image driving mode for the n th subpixel row, a turned-on level voltage interval of the n th scan signal and a turned-on level voltage interval of the n+1 th scan signal partially overlap each other.

3. The organic light emitting display device of claim 1 , wherein, in a driving transistor threshold voltage compensation mode on the n th subpixel row, a turned-on level voltage interval of the n th scan signal and a turned-on level voltage interval of the n+1 th scan signal overlap each other.

4. The organic light emitting display device of claim 1 , wherein, in a driving transistor mobility compensation mode on the n th subpixel row, while the n+1 th scan signal is output with a turned-on level voltage, the n th scan signal is output with the turned-on level voltage and then output with a turned-off level voltage.

5. An organic light emitting display panel comprising:
a plurality of data lines for supplying a data voltage;
a plurality of gate lines for supplying a gate signal; and
a plurality of subpixels arranged in a matrix including rows and columns of subpixels, each of the plurality of gate lines being arranged on a respective subpixel row,
wherein in each of the subpixels,
an organic light emitting diode, a driving transistor for driving the organic light emitting diode, a switching transistor controlled by a scan signal applied to a gate node of the switching transistor and electrically connected between a first node of the driving transistor and a data line, a sensing transistor controlled by a sensing signal applied to a gate node of the sensing transistor and electrically connected between a second node of the driving transistor and a reference voltage line, and a storage capacitor electrically connected between the first node and the second node of the driving transistor are arranged,
wherein an n+1 th gate line arranged on an n+1 th subpixel row is connected in common to the gate node of the switching transistor within each subpixel in the n+1 th subpixel row and the gate node of the sensing transistor within each subpixel in an n th subpixel row,
wherein the gate node of the switching transistor within each subpixel in the n th subpixel row receives an n th scan signal output through an n th gate line arranged in the n th subpixel row, and the gate node of the sensing transistor within each subpixel in the n th subpixel row receives an n+1 th scan signal output through the n+1 th gate line arranged on the n+1 th subpixel row as an n th sensing signal,
wherein, in an afterimage compensation mode for the n th subpixel row, while the n th scan signal is output with a turned-on level voltage, the n+1 th scan signal is changed into and output with the turned-on level voltage, and then is output with a turned-off level voltage, and, when the n th scan signal is changed into and output with the turned-off level voltage, the n+1 th scan signal is output with the turned-on level voltage,
wherein n is a natural number greater than zero.

6. The organic light emitting display panel of claim 5 , wherein, in an image driving mode for the n th subpixel row, a turned-on level voltage interval of the n th scan signal and a turned-on level voltage interval of the n+1 th scan signal partially overlap each other.

7. The organic light emitting display panel of claim 5 , wherein, in a driving transistor threshold voltage compensation mode on the n th subpixel row, a turned-on level voltage interval of the n th scan signal and a turned-on level voltage interval of the n+1 th scan signal overlap each other.

8. The organic light emitting display panel of claim 5 , wherein, in a driving transistor mobility compensation mode on the n th subpixel row, while the n+1 th scan signal is output with a turned-on level voltage, the n th scan signal is output with the turned-on level voltage and then output with a turned-off level voltage.

9. An image driving method of an organic light emitting display device in which a plurality of subpixels defined by a plurality of data lines and a plurality of gate lines are arranged, each of the subpixels including an organic light emitting diode, a driving transistor for driving the organic light emitting diode, a switching transistor controlled by a scan signal applied to a gate node of the switching transistor and electrically connected between a first node of the driving transistor and the data line, a sensing transistor controlled by a sensing signal applied to a gate node of the sensing transistor and electrically connected between a second node of the driving transistor and a reference voltage line, a display panel on which a storage capacitor electrically connected between the first node and the second node of the driving transistor is arranged, a data driver for driving the plurality of data lines, and a gate driver for driving the plurality of gate lines, the image driving method comprising:
turning on the switching transistor within each subpixel arranged on an n th subpixel line by providing a turned-on level voltage of an n th scan signal output from an n th gate line arranged on the n th

Assignees

• Lg Display Co Ltd

Inventors

• Park Yong Kyu
• Jang Seokyu
• Lee Chang Bok

Classifications

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title

• G09G2300/043

  Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver · CPC title

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G3/3291 Primary

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title