Organic light emitting diode display

Patent metadata

Field	Value
Publication number	US-10916218-B2
Application number	US-201715634576-A
Country	US
Kind code	B2
Filing date	Jun 27, 2017
Priority date	Jun 30, 2016
Publication date	Feb 9, 2021
Grant date	Feb 9, 2021

Abstract

Provided is an organic light emitting display. The organic light emitting display can include a gate driving circuit configured to supply a gate signal through each of a plurality of gate lines connected to a display panel, and a luminance control unit between the gate driving circuit and the display panel and electrically connected to the plurality of gate lines and a power supply line. A gate signal is supplied to the pixels in a distributed manner during a plurality of refresh periods. Therefore, it is possible to reduce a luminance decrease in the pixels during the entire refresh period.

First claim

What is claimed is:

1. An organic light emitting display comprising:
a gate driving circuit that supplies a gate signal through each of a plurality of gate lines connected to a display panel; and
a luminance control unit between the gate driving circuit and the display panel, and electrically connected to the plurality of gate lines and a power supply line,
the luminance control unit including:
a first switching element electrically connected to each of the plurality of gate lines;
a second switching element electrically connected between each of the plurality of gate lines and the power supply line; and
a luminance control signal line electrically connected to the first switching element and the second switching element so as to transfer a luminance control signal to the first switching element and the second switching element during an entire refresh period,
wherein the entire refresh period includes a plurality of refresh periods,
wherein the gate signal is supplied in an irregular order into each of the gate lines over the entire refresh period, the irregular order including supplying the gate signal to at least two adjacent even or odd gate lines in a nonsequential order,
wherein the luminance control signal controls the gate signal so that the gate signal is supplied only once to each of the plurality of gate lines during the entire refresh period,
wherein the gate signal and the luminance control signal are supplied at the same time during the entire refresh period,
wherein the plurality of refresh period includes a first refresh period, a second refresh period and a refresh blank section between the first and the second refresh periods, and
wherein a luminance of the display panel is higher in the refresh blank section than in the first and the second refresh periods.

2. The organic light emitting display according to claim 1 , wherein the luminance control unit further includes an inverter that controls the first switching element and the second element to operate reversely to each other.

3. The organic light emitting display according to claim 2 , wherein the luminance control signal line includes a first luminance control signal line and a second luminance control signal line,
the first luminance control signal line is connected to a gate of the first switching element, and
the second luminance control signal line is connected to a gate of the second switching element in an output node of the inverter connected to the first luminance control signal line.

4. The organic light emitting display according to claim 1 , wherein the luminance control signal controls an operation of the first switching element connected to the gate line to output irregularly a gate signal during each of the plurality of refresh periods.

5. The organic light emitting display according to claim 1 , wherein the luminance control signal controls an operation of the second switching element to output a gate low voltage during each of the plurality of refresh periods.

6. The organic light emitting display according to claim 1 , wherein the luminance control signal controls whether or not to output a gate signal for each of the plurality of gate lines.

7. The organic light emitting display according to claim 1 , wherein pixels disposed on gate lines corresponding to the supplied gate signals are initialized, and
wherein pixels disposed on the other gate lines to which the gate signal is not supplied are not initialized, during each of the plurality of refresh periods.

8. An organic light emitting display comprising:
a gate driving circuit that supplies a gate signal through each of a plurality of gate lines connected to a display panel; and
a luminance control unit between the gate driving circuit and the display panel, and electrically connected to the plurality of gate lines and a power supply line,
the luminance control unit further including:
a first switching element that determines whether or not to supply a gate signal including a gate high voltage to each of the plurality of gate lines during a predetermined refresh period;
a second switching element that supplies a gate low voltage to each of the plurality of gate lines during the predetermined refresh period; and
a luminance control signal line electrically connected to the first switching element and the second switching element so as to transfer a luminance control signal to the first switching element and the second switching element during the predetermined refresh period,

wherein the predetermined refresh period includes a first refresh period, a second refresh period and a refresh blank section between the first and the second refresh periods,
wherein the luminance control signal controls the gate signal to be output through an odd-numbered gate line during the first refresh period, and controls the gate signal to be output through an even-numbered gate line during the second refresh period,
wherein the luminance control signal controls the gate signal so that the gate signal is supplied only once to each of the plurality of gate lines during an entirety of the predetermined refresh period,
wherein a luminance decrease during the first refresh period and a luminance decrease during the second refresh period are not overlapped with each other, and
wherein a luminance of the display panel is higher in the refresh blank section than in the first and the second refresh periods.

9. The organic light emitting display according to claim 8 , wherein the luminance control signal controls whether or not to output the gate signal in order such that a luminance of the display panel is recovered and maintained between the first refresh period and the second refresh period for the refresh blank section.

10. The organic light emitting display according to claim 8 , wherein pixels disposed on gate lines corresponding to the supplied gate signals are initialized, and
wherein pixels disposed on the other gate lines which the gate signal is not supplied are not initialized, during each of the first and the second refresh periods.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Kitae
• CHOI Seungchan
• Lee Junho
• Ryu Sungbin
• Yoon Siu

Classifications

• G09G2300/0852

  being a dynamic memory with more than one capacitor · CPC title

• G09G2310/0251

  Precharge or discharge of pixel before applying new pixel voltage · CPC title

• G09G2320/043

  Preventing or counteracting the effects of ageing · CPC title

• G09G2310/0262

  The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes · CPC title

• G09G2300/0861

  with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes · CPC title