Gate driver, display apparatus including the same and method of driving display panel using the same

• US 10,510,312 B2
• Filed: 07/21/2015
• Issued: 12/17/2019
• Est. Priority Date: 08/05/2014
• Status: Active Grant

• Current Assignee: TCL China Star Optoelectronics Technology Co. Ltd. (TCL Technology Group Corp.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Sim, Jong-Hyun, Lee, Neung-Beom, Kwag, Dong-Joon, Kim, Soo-Yeon, Kim, Jeong-Hyun, Won, Hyeon-Uk, Lee, Ji-Ye, Hwang, Hyeon-Woo
• Primary Examiner(s): Mengistu, Amare
• Assistant Examiner(s): Nadkarni, Sarvesh J
• Application Number:
  US14/805,290
• Publication Number:
  US 20160042713A1
• Time in Patent Office: 1,610 Days
• Field of Search: None
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 2320/0219 Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
• CPC Class Codes: G09G 2320/0223 Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
• CPC Class Codes: G09G 3/3674 Details of drivers for scan electrodes

Abstract

A gate driver includes a gate signal generating part, a switching part and a switching controlling part. The gate signal generating part is configured to generate a gate signal including a precharge time and a normal charge time using a compensated gate on voltage and a gate off voltage. The switching part is disposed between the gate signal generating part and a gate line. The switching part is configured to apply a compensated gate signal to the gate line. The switching controlling part is configured to generate a switching control signal for controlling an operation of the switching part.

Claims

1. A gate driver comprising:

a gate signal generating part configured to generate a gate signal including a precharge time and a normal charge time using a compensated gate on voltage and a gate off voltage;

a switching part disposed between the gate signal generating part and a gate line and configured to apply a compensated gate signal to the gate line; and

a switching controlling part configured to generate a switching control signal for controlling an operation of the switching part,

wherein the switching part comprises a first switch and a first diode connected in parallel between the gate signal generating part and the gate line,

wherein the switching control signal is generated using a previous gate clock signal corresponding to a previous gate line, a present gate clock signal corresponding to a present gate line and a kick back compensation signal, and

wherein the switching controlling part comprises AND gate configured to receive the previous gate clock signal, the present gate clock signal and the kick back compensation signal.

2. The gate driver of claim 1, wherein the switching part is configured to prevent a voltage drop of the compensated gate on voltage from being applied to the compensated gate signal in the precharge time, and

the switching part is configured to allow the voltage drop of the compensated gate on voltage to be applied to the compensated gate signal in the normal charge time.

3. The gate driver of claim 1, wherein the compensated gate on voltage has a gate on voltage level which is a DC voltage and gradually decreases from the gate on voltage level corresponding to the kick back compensation signal.