Display panel

Patent metadata

Field	Value
Publication number	US-10559264-B2
Application number	US-201816176400-A
Country	US
Kind code	B2
Filing date	Oct 31, 2018
Priority date	Oct 31, 2017
Publication date	Feb 11, 2020
Grant date	Feb 11, 2020

Abstract

A display panel having a display area where an image is displayed and a non-display area outside the display area, comprising first and second gate drive units disposed in a first outer area and a second outer area of the non-display area corresponding to both sides of the display area in a horizontal direction. Here, the first gate drive unit disposed in the first outer area includes a first signal block supplying a first drive control signal to respective horizontal lines having pixels, which are arranged successively in the horizontal direction, of the plurality of pixels and a second signal block supplying a second drive control signal having pulses different from those of the first drive control signal to the respective horizontal lines, and the second gate drive unit disposed in the second outer area includes the second signal block and a third signal block supplying a third drive control signal having pulses different from those of the first and second drive control signals to the respective horizontal lines.

First claim

What is claimed is:

1. A display panel including a display area where an image is displayed and a non-display area outside the display area, comprising:
a plurality of pixels corresponding to a plurality of pixel areas defined in the display area; and
first and second gate drive units respectively disposed in a first outer area and a second outer area of the non-display area corresponding to both sides of the display area in a horizontal direction,
wherein the first gate drive unit disposed in the first outer area includes a first signal block supplying a first drive control signal to pixels arranged successively in the horizontal direction among the plurality of pixels and a second signal block supplying a second drive control signal having pulses different from those of the first drive control signal to the pixels arranged successively in the horizontal direction, and
wherein the second gate drive unit disposed in the second outer area includes the second signal block and a third signal block supplying a third drive control signal having pulses different from those of the first and second drive control signals to the pixels arranged successively in the horizontal direction.

2. The display panel of claim 1 , wherein the first and second drive control signals are supplied at respective turn-on levels during a predetermined period by the first and second signal blocks,
wherein the second drive control signal is changed to a turn-off level earlier than the first drive control signal before the predetermined period expires.

3. The display panel of claim 2 , wherein the third drive control signal is supplied at the turn-off level during the predetermined period.

4. The display panel of claim 1 , wherein one pixel of the plurality of pixels which is disposed in an i th horizontal line (where i is a natural number greater than or equal to 1 and smaller than or equal to N, where N is the number of the horizontal lines) comprises:
an organic light emitting device;
a first thin film transistor connected in series with the organic light emitting device between a first driving source line and a second driving source line, wherein the first driving source line supplies a first driving source to the plurality of pixels and the second driving source line supplies a second driving source to the plurality of pixels, and the second driving source is lower than the first driving source;
a second thin film transistor disposed between a first node and a second node, wherein the first node is connected with one of the first and second electrodes of the first thin film transistor corresponding to the first driving source line, and the second node is connected with a gate electrode of the first thin film transistor;
a storage capacitor disposed between the second node and a third node, which is connected with an anode electrode of the organic light emitting device;
a third thin film transistor disposed between the third node and an initialization source line supplying an initialization source to the plurality of pixels;
fourth and fifth thin film transistors disposed between a data line supplying a data signal to the plurality of pixels and a fourth node connected with the other of the first and second electrodes of the first thin film transistor;
a sixth thin film transistor disposed between the fourth node and the organic light emitting device; and
a seventh thin film transistor disposed between the first driving source line and the first node.

5. The display panel of claim 4 , wherein the second thin film transistor is made in a conduction type different from those of the third, fourth, fifth, sixth, and seventh thin film transistors,
wherein the second thin film transistor is turned on based on an i th sampling scan signal,
wherein the third thin film transistor is turned on based on an i th switching scan signal,
wherein one of the fourth and fifth thin film transistors is turned on based on the i th switching scan signal while the other is turned on based on an i+1 th switching scan signal, and
wherein one of the first and second drive control signals is a sampling scan signal for the respective horizontal lines, while the other is a switching scan signal for the respective horizontal lines.

6. The display panel of claim 5 , wherein, during a period when the data signal is supplied to the one pixel, the i th sampling scan signal and the i th switching scan signal are supplied at respective turn-on levels,
wherein, before the period when the data signal is supplied is expired, the i th sampling scan signal is changed to the turn-off level earlier than the i th switching scan signal,
wherein the first signal block supplies switching scan signals for the pixels arranged successively in the horizontal direction, and
wherein the second signal block supplies sampling scan signals for the pixels arranged successively in the horizontal direction.

7. The display panel of claim 6 , wherein, during a period when the data signal is supplied to the one pixel, the i th sampling scan signal and the i th switching scan signal are supplied at turn-on levels,
wherein, before the period when the data signal is supplied is expired, the i th switching scan signal is changed to the turn-off level earlier than the i th sampling scan signal,
wherein the first signal block supplies sampling scan signals for the pixels arranged successively in the horizontal direction, and
wherein the second signal block supplies switching scan signals for the pixels arranged successively in the horizontal direction.

8. The display panel of claim 5 , wherein the sixth thin film transistor is turned on based on an i th emission signal,
wherein the seventh thin film transistor is turned on based on an i+1 th emission signal, and
wherein a third drive control signal supplied by the third signal block is an emission signal for the pixels arranged successively in the horizontal direction.

9. The display panel of claim 8 , wherein the third signal block of the second gate drive unit is disposed in an area smaller than that for the first signal block of the first gate drive unit, and
wherein the second signal block of the second gate drive unit is disposed in an area greater than that for the second signal block of the first gate drive unit.

10. The display panel of claim 9 , wherein the second signal block includes buffer units which correspond to the pixels arranged successively in the horizontal direction, and
wherein the buffer unit of the second signal block of the second gate drive unit is disposed in an area greater than that for the buffer unit of the second signal block of the first gate drive unit.

11. The display panel of claim 10 , wherein the buffer unit includes first and second buffer transistors which are connected in series between a first gate driving source and a second gate driving source lower than the first gate driving source, and
wherein the first and second buffer transistors provided in the second signal block of the second gate drive unit have channel widths wider than those of the first and second buffer transistors provided in the second signal block of the first gate drive unit.

12. The display panel of claim 5 , wherein the second signal block of each of the first and second gate drive units inverts an output signal of the first signal block according to a predetermined clock signal for generating a second drive control signal to generate the second drive control signal, and outputs the second drive control signal to the pixels arranged successively in the horizontal direction based on a predetermined synchronization signal.

13. A display panel

Assignees

• Lg Display Co Ltd

Inventors

• Yu Jaesung
• Kim Seonyeong

Classifications

• 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

• G09G2310/0281

  Arrangement of scan or data electrode driver circuits at the periphery of a panel not inherent to a split matrix structure · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G3/3275

  Details of drivers for data electrodes · CPC title

• G09G2300/0809

  Several active elements per pixel in active matrix panels · CPC title