Display device and driving method thereof

Patent metadata

Field	Value
Publication number	US-10283065-B2
Application number	US-201615360461-A
Country	US
Kind code	B2
Filing date	Nov 23, 2016
Priority date	Nov 25, 2015
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

A display device comprises: a timing controller that is turned on to a floating state by a first logic voltage and, after a switching period, switches from the floating state to a normal operating state based on a reset signal to generate timing control signals; a level shifter configured to receive the first logic voltage and a second logic voltage and level-shift the timing control signals to the second logic voltage; and an output enable signal control part that outputs an output enable signal at enable level LOW or disable level HIGH, in synchronization with the reset signal, wherein, during the switching period, the level shifter receives the output enable signal at the disable level HIGH and does not level-shift the timing control signals.

First claim

What is claimed is:

1. A display device comprising:
a timing controller that is turned on to a floating state by a first logic voltage and, after a switching period, switches from the floating state to a normal operating state based on a reset signal to generate timing control signals;
a level shifter configured to receive the first logic voltage and a second logic voltage and level-shift the timing control signals to the second logic voltage; and
an output enable signal control part that outputs an output enable signal at disable level HIGH when the timing controller is turned on to the floating state and outputs the output enable signal at enable level LOW when the timing controller switches from the floating state to the normal operating state,
wherein, during the switching period, the level shifter receives the output enable signal at the disable level HIGH and does not level-shift the timing control signals, and
wherein after the switching period, the level shifter receives the output enable signal at the enable level LOW and performs level-shift of the timing control signals.

2. The display device of claim 1 , wherein the second logic voltage is greater than the first logic voltage.

3. The display device of claim 1 , wherein, after the switching period, the level shifter receives the output enable signal at the enable level LOW and level-shifts the timing control signals to the second logic voltage.

4. The display device of claim 3 , wherein a first subset of the level-shifted timing control signals are supplied to a gate drive circuit, and wherein a second subset of the level-shifted timing control signals are supplied to a host system.

5. The display device of claim 1 , wherein the output enable signal control part comprises a switching element and a resistor that control the output enable signal.

6. The display device of claim 5 , wherein the switching element comprises:
a first electrode that receives the reset signal;
a second electrode that outputs the output enable signal; and
a third electrode connected to a ground voltage source.

7. The display device of claim 6 , wherein the second electrode is connected in series to the resistor and an input terminal of the second logic voltage.

8. A display device comprising:
a timing controller that is turned on to a floating state by a first logic voltage and, after a switching period, switches from the floating state to a normal operating state based on a reset signal to generate timing control signals;
a level shifter that level-shifts the timing control signals to a second logic voltage level greater than the first logic voltage level, and enables level-shifting in response to an output enable signal; and
an output enable signal control part that controls the output enable signal to be at a disable level HIGH during a switching period when the timing controller is turned on to the floating state and, the second logic voltage changing to a first ON level at the start of the switching period when the timing controller switches from the floating state to the normal operating state, the reset signal changing to a second ON level at the end of the switching period, and controls the output enable signal to be at an enable level LOW after the switching period.

9. The display device of claim 8 , wherein the level shifter does not level-shift or output the timing control signals during the switching period in response to the output enable signal being at disable level OFF.

10. The display device of claim 8 , wherein the level shifter level-shifts and outputs the timing control signals after the switching period in response to the output enable signal being at the enable level LOW.

11. The display device of claim 8 , wherein the second logic voltage changes to the first ON level before the first logic voltage changes to a third ON level.

12. The display device of claim 8 , wherein the output enable signal control part comprises:
a switching element comprising a control electrode connected to an input terminal of the reset signal, a first electrode connected to a first node that outputs the output enable signal, and a second electrode connected to a ground voltage source; and
a resistor connected between an input terminal of the second logic voltage and the first node.

13. The display device of claim 12 , wherein the switching element is a field effect transistor or a bipolar junction transistor.

14. A method of driving a display device comprising:
generating timing control signals at a first logic voltage level in response to a reset signal;
level-shifting the timing control signals to a second logic voltage level greater than the first logic voltage level;
enabling level-shifting in response to an output enable signal;
controlling the output enable signal to be at disable level HIGH during a switching period, the second logic voltage changing to a first ON level at the start of the switching period, the reset signal changing to a second ON level at the end of the switching period; and
controlling the output enable signal to be at enable level LOW after the switching period, wherein the output enable signal is at the disable level HIGH when a timing controller is turned on to a floating state, and wherein the output enable signal is at the enable level LOW when the timing controller switches from the floating state to a normal operating state.

15. The method of claim 14 , wherein the enabling of level shifting in response to the output enable signal and the level-shifting of the timing control signals are stopped during the switching period in response to the output enable signal being at the disable level OFF.

16. The method of claim 14 , wherein the enabling of level shifting in response to the output enable signal and the level-shifting of the timing control signals are started after the switching period in response to the output enable signal being at the enable level LOW.

17. The method of claim 14 , wherein the second logic voltage changes to the first ON level before the first logic voltage changes to a third ON level.

Assignees

• Lg Display Co Ltd

Inventors

• Lee Dogon
• Yoo Yeontaek

Classifications

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G09G2310/0289

  Details of voltage level shifters arranged for use in a driving circuit · CPC title

• G09G2370/08

  Details of image data interface between the display device controller and the data line driver circuit · CPC title

• G09G3/2096 Primary

  Details of the interface to the display terminal specific for a flat panel (suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167) · CPC title

• G09G5/18

  Timing circuits for raster scan displays (specially adapted for television H04N {; synchronisation between the display unit and other display units, videodisc player G09G5/12}) · CPC title