US-20260127998-A1 - LEVEL SHIFTING DEVICE AND DISPLAY DEVICE INCLUDING THE SAME

US20260127998A1US 20260127998 A1US20260127998 A1US 20260127998A1US-20260127998-A1

Abstract

A level shifting device and a display device including the same are discussed. The level shifting device in some examples can include a controller configured to output a switching signal based on a plurality of output selection signals input in parallel through each corresponding input pin, and a first switching unit including a plurality of first switching elements connected between an input terminal and output terminals of a level selection signal, respectively, and configured to be turned on in response to the switching signal.

Inventors

Jungjae KIM
Sanguk Lee

Assignees

LG DISPLAY CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20250430
Priority Date: 20241105

Claims (20)

1 . A level shifting device, comprising: a controller configured to output a switching signal based on a plurality of output selection signals input in parallel through each corresponding input pin; and a first switching unit including a plurality of first switching elements connected between an input terminal and output terminals of a level selection signal, respectively, and configured to be turned on in response to the switching signal, wherein the controller outputs the switching signal in a turn-on level to one of the plurality of first switching elements based on the plurality of output selection signals, and wherein the plurality of first switching elements are turned on according to the switching signal, and are configured to output the level selection signal to a corresponding output terminal.
2 . The level shifting device of claim 1 , wherein the plurality of output selection signals instruct each bit of a binary code which includes information with respect to an output signal of which a voltage level is to be transitioned among the output signals.
3 . The level shifting device of claim 1 , further comprising: a second switching unit including a plurality of second switching elements connected between the plurality of first switching elements and the output terminals thereof, respectively, and configured to be turned on in response to a latch signal.
4 . The level shifting device of claim 3 , wherein the second switching unit further includes: first capacitors connected between one end of the plurality of second switching elements and a ground voltage, respectively; and second capacitors connected between another end of the plurality of second switching elements and the ground voltage, respectively.
5 . The level shifting device of claim 4 , wherein the controller further receives the latch signal, and outputs the switching signal to a first switching element selected by the plurality of output selection signals among the plurality of first switching elements in response to the latch signal in a turn-on level.
6 . The level shifting device of claim 5 , wherein each of the plurality of second switching elements outputs the level selection signal input through the first switching element corresponding thereto to a corresponding output terminal in response to the latch signal in the turn-on level.
7 . The level shifting device of claim 6 , wherein the first capacitors or the second capacitors store a voltage corresponding to the level selection signal when the first switching element corresponding thereto or the second switching element corresponding thereto is turned on.
8 . The level shifting device of claim 7 , wherein a signal corresponding to the voltage stored in the second capacitors is output to the output terminals when the plurality of second switching elements are turned off.
9 . The level shifting device of claim 5 , wherein the controller further receives a pre-latch signal, and outputs the switching signal to a first switching element selected by the plurality of output selection signals among the plurality of first switching elements when the pre-latch signal is in a turn-on level.
10 . The level shifting device of claim 9 , wherein the first capacitors store a voltage corresponding to the level selection signal when the plurality of first switching elements are turned on in response to the pre-latch signal while the latch signal is applied in a turn-off level.
11 . The level shifting device of claim 10 , wherein a signal corresponding to the voltage stored in the first capacitors is output to the output terminal through the plurality of second switching elements when the latch signal is applied in a turn-on level.
12 . A display device, comprising: a display panel having an arrangement of pixels; a timing controller configured to control an operation timing of the display panel; a level shifting device configured to generate output signals based on a gate driving control signal applied from the timing controller and output the output signals to a corresponding output terminal; and a gate driver including a plurality of stage circuits connected to the output terminals of the level shifting device, respectively, and configured to apply a gate signal to the pixels in response to the output signal, wherein the timing controller is configured to generate a plurality of output selection signals by encoding information with respect to an output signal of which a voltage level is to be transitioned among the output signals in a binary code, and wherein the level shifting device includes a controller configured to receive the plurality of output selection signals in parallel through each corresponding input pin and to generate the output signals based on the plurality of output selection signals.
13 . The display device of claim 12 , wherein the controller of the level shifting device outputs a switching signal based on the plurality of output selection signals, and wherein the level shifting device further includes: a first switching unit including a plurality of first switching elements connected between an input terminal and output terminals of a level selection signal, respectively, and configured to be turned on in response to the switching signal; and a second switching unit including a plurality of second switching elements connected between the plurality of first switching elements and the output terminals thereof, respectively, and configured to be turned on in response to a latch signal.
14 . The display device of claim 13 , wherein the second switching unit further includes: first capacitors connected between one end of the plurality of second switching elements and a ground voltage, respectively; and second capacitors connected between another end of the plurality of second switching elements and the ground voltage, respectively.
15 . The display device of claim 14 , wherein the controller of the level shifting device further receives the latch signal, and outputs the switching signal to one of the plurality of first switching elements in response to the latch signal in a turn-on level.
16 . The display device of claim 15 , wherein each of the plurality of second switching elements outputs the level selection signal input through the first switching element corresponding thereto to a corresponding output terminal in response to the latch signal in the turn-on level.
17 . The display device of claim 16 , wherein the first capacitors or the second capacitors store a voltage corresponding to the level selection signal when the first switching element corresponding thereto or the second switching element corresponding thereto is turned on.
18 . The display device of claim 17 , wherein a signal corresponding to the voltage stored in the second capacitors is output to the output terminals when the plurality of second switching elements are turned off.
19 . The display device of claim 15 , wherein the controller of the level shifting device further receives a pre-latch signal, and outputs the switching signal to a first switching element selected by the plurality of output selection signals among the plurality of first switching elements when the pre-latch signal is in a turn-on level.
20 . The display device of claim 19 , wherein the first capacitors store a voltage corresponding to the level selection signal when the plurality of first switching elements are turned on in response to the pre-latch signal while the latch signal is applied in a turn-off level, and wherein a signal corresponding to the voltage stored in the first capacitors is output to the output terminal through the plurality of second switching elements when the latch signal is applied in a turn-on level.

Description

CROSS-REFERENCE TO RELATED APPLICATION The present application claims priority to Korean Patent Application No. 10-2024-0155116, filed in the Republic of Korea on Nov. 5, 2024, the entire contents of which is hereby expressly incorporated by reference into the present application. BACKGROUND Technical Field The present disclosure relates to a level shifting device and a display device including the same. Discussion of the Related Art A pixel of a display device includes a light emitting diode and a driving circuit configured to drive the light emitting diode. The light emitting diode can be selected variously according to the types of the display device; however, recently, an organic light emitting diode (OLED) having a fast response speed and excellent light emission efficiency, luminance, viewing angle, contrast range and color reproducibility is actively used. The display device has a level shifting device configured to boost or drop a voltage level of signals applied to the display panel to have a desired voltage level. The level shifting device in general includes input pins which correspond to signals to be applied to the display panel, respectively, and is configured to boost or drop a voltage level of each of signals input through the input pins by using an independent level shifter. Such a level shifting device can boost or drop a voltage level of a signal at a fast speed. However, there is a limitation in that a quantity of the input pins increases and the entire size can grow greater because of many level shifters provided therein. In order to reduce the quantity of the input pins and the level shifters, a manner of sequentially inputting a signal to one input pin and boosting or dropping a voltage level sequentially through one level shifter can be used. However, there can be a drawback in that a long waiting time is used for the signal processing. SUMMARY OF THE DISCLOSURE The embodiments of the present disclosure provide a level shifting device which reduces a quantity of the input pins, and in which the waiting time for signal processing is unnecessary or reduced, and provide a display device including the level shifting device. The embodiments of the present disclosure provide a level shifting device which selects a signal of which a voltage level is to be transitioned using an output selection data input in parallel, and provide a display device including the level shifting device. The embodiments of the present disclosure provide a level shifting device which selects a signal of which a voltage level is to be transitioned using output selection bits input in parallel and boosts or drops a signal of which a voltage level is to be transitioned using a level selection signal, and provide a display device including the level shifting device. One or more embodiments of the present disclosure provide a level shifting device, including a controller configured to output a switching signal based on a plurality of output selection signals input in parallel through each corresponding input pin; and a first switching unit including a plurality of first switching elements connected between an input terminal and output terminals of a level selection signal, respectively, and configured to be turned on in response to the switching signal. According to aspects of the present disclosure, the controller can output the switching signal in a turn-on level to one among the first switching elements based on the plurality of output selection signals, and the first switching elements can be turned on according to the switching signal, and output the level selection signal to a corresponding output terminal. According to aspects of the present disclosure, the plurality of output selection signals can instruct each bit of a binary code which includes information with respect to an output signal of which a voltage level is to be transitioned among the output signals. According to aspects of the present disclosure, the level shifting device can further include: a second switching unit including a plurality of second switching elements connected between the first switching elements and the output terminals thereof, respectively, and configured to be turned on in response to a latch signal. According to aspects of the present disclosure, the second switching unit can further include first capacitors connected between one end of the second switching elements and a ground voltage, respectively; and second capacitors connected between another end of the second switching elements and the ground voltage, respectively. According to aspects of the present disclosure, the controller can further receive the latch signal, and output the switching signal to a first switching element selected by the plurality of output selection signals among the first switching elements in response to the latch signal in a turn-on level. According to aspects of the present disclosure, each of the second switching elements can output the level sel