US-12626648-B2 - Display device

US12626648B2US 12626648 B2US12626648 B2US 12626648B2US-12626648-B2

Abstract

A display device is provided. A display device of one embodiment comprises a plurality of sub pixels, a plurality of data lines connected to each of the plurality of sub pixels, and a multiplexer (MUX) circuit connected to a pair of adjacent data lines among the plurality of data lines, the MUX circuit comprising a charge transistor connected to each of the pair of data lines, and a discharge transistor connected to each of the pair of data lines. Accordingly, the MUX circuit comprises the discharge transistor discharging a voltage of the data line, to reduce or minimize a failure of abnormal driving of sub pixels connected to a part of the data lines.

Inventors

Jinyeong Kim
WonJun CHOI
Hyunwoo Kim

Assignees

LG DISPLAY CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20241108
Priority Date: 20240201

Claims (11)

1 . A display device, comprising: a plurality of sub pixels; a plurality of data lines electrically connected to each of the plurality of sub pixels; and a multiplexer (MUX) circuit electrically connected to a pair of adjacent data lines among the plurality of data lines, wherein the MUX circuit comprises: a charge transistor electrically connected to each of the pair of adjacent data lines; and a discharge transistor electrically connected to each of the pair of adjacent data lines, wherein the charge transistor comprises: a first charge transistor electrically connected between one of the pair of adjacent data lines and a data pad; and a second charge transistor electrically connected between the other of the pair of adjacent data lines and the data pad, wherein the discharge transistor comprises: a first discharge transistor electrically connected between the one data line and a discharge line; and a second discharge transistor electrically connected between the other data line and the discharge line, wherein the display device further comprises: a first selection line electrically connected to a gate electrode of the first charge transistor and a gate electrode of the second discharge transistor; and a second selection line electrically connected to a gate electrode of the second charge transistor and a gate electrode of the first discharge transistor.
2 . The display device of claim 1 , wherein a first selection signal of the first selection line and a second selection signal of the second selection line are signals of a mutually reversed phase.
3 . The display device of claim 2 , wherein for a period in which the first selection signal of a turn-on level is supplied and the second selection signal of a turn-off level is supplied, the one data line is electrically connected to the data pad through the first charge transistor, and the other data line is electrically connected to the discharge line through the second discharge transistor.
4 . The display device of claim 2 , wherein for a period in which the second selection signal of a turn-on level is supplied and the first selection signal of a turn-off level is supplied, the one data line is electrically connected to the discharge line through the first discharge transistor, and the other data line is electrically connected to the data pad through the second charge transistor.
5 . The display device of claim 1 , wherein the plurality of sub pixels comprises: a pair of first sub pixels adjacent to each other; a pair of second sub pixels adjacent to each other; and a pair of third sub pixels adjacent to each other, and wherein at least a part of the pair of first sub pixels, the pair of second sub pixels, and the pair of third sub pixels are driven for a different period.
6 . The display device of claim 5 , wherein the plurality of data lines comprises: a 1-1 data line and a 1-2 data line electrically connected to each of the pair of first sub pixels, and electrically connected to the same MUX circuit; a 2-1 data line and a 2-2 data line electrically connected to each of the pair of second sub pixels, and electrically connected to the same MUX circuit; and a 3-1 data line and a 3-2 data line electrically connected to each of the pair of third sub pixels, and electrically connected to the same MUX circuit.
7 . The display device of claim 5 , wherein the plurality of data lines comprises: a plurality of first data lines electrically connected to each of the pair of first sub pixels; a 2-1 data line and a 2-2 data line electrically connected to each of the pair of second sub pixels, and electrically connected to the same MUX circuit; and a 3-1 data line and a 3-2 data line electrically connected to each of the pair of third sub pixels, and electrically connected to the same MUX circuit.
8 . A display device, comprising: a substrate including an active area and a non-active area; a plurality of data lines configured to extend from the non-active area to the active area; a plurality of data pads disposed in the non-active area; and a plurality of MUX circuits disposed in the non-active area, and electrically connected between the plurality of data lines and the plurality of data pads, wherein each of the plurality of MUX circuits comprises: a plurality of first charge transistors electrically connected to a part of the plurality of data lines; a plurality of second charge transistors electrically connected to a rest of the plurality of data lines; a plurality of first discharge transistor electrically connected to the part of the plurality of data lines; and a plurality of second discharge transistors electrically connected to the rest of the plurality of data lines, wherein the plurality of first charge transistors and the plurality of first discharge transistors are turned on for a different period, and wherein the plurality of second charge transistors and the plurality of second discharge transistors are turned on for a different period, wherein each of the plurality of first charge transistors comprises: a first charge active layer on the substrate; a first charge gate electrode on the first charge active layer; a first charge source electrode on the first charge gate electrode, and electrically connected to each of the plurality of data pads; and a first charge drain electrode on the first charge gate electrode, and electrically connected to each of the part of the plurality of data lines, and wherein each of the plurality of second charge transistors comprises: a second charge active layer on the substrate; a second charge gate electrode on the second charge active layer; a second charge source electrode on the second charge gate electrode, and electrically connected to each of the plurality of data pads; and a second charge drain electrode on the second charge gate electrode, and electrically connected to each of the rest of the plurality of data lines.
9 . The display device of claim 8 , wherein each of the plurality of first discharge transistors comprises: a first discharge active layer on the substrate; a first discharge gate electrode on the first discharge active layer; a first discharge source electrode on the first discharge gate electrode, and electrically connected to each of the part of the plurality of data lines; and a first discharge drain electrode on the first discharge gate electrode, and electrically connected to a discharge line, and wherein each of the plurality of second discharge transistors comprises: a second discharge active layer on the substrate; a second discharge gate electrode on the second discharge active layer; a second discharge source electrode on the second discharge gate electrode, and electrically connected to each of the rest of the plurality of data lines; and a second discharge drain electrode on the second discharge gate electrode, and electrically connected to the discharge line.
10 . The display device of claim 9 , further comprising: a first selection line electrically connected to gate electrodes of the plurality of first charge transistors and gate electrodes of the plurality of second discharge transistors; and a second selection line electrically connected to gate electrodes of the plurality of second charge transistors and gate electrodes of the plurality of first discharge transistors.
11 . The display device of claim 10 , wherein a first selection signal of the first selection line and a second selection signal of the second selection line are signals of a mutually reversed phase.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the priority of Korean Patent Application No. 10-2024-0015763 filed on Feb. 1, 2024, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. BACKGROUND Technical Field The present disclosure relates to a display device, and particularly, a display device using a light emitting diode (LED). Description of the Related Art Display devices used for a computer monitor, a TV, a mobile phone and the like include organic light emitting display (OLED) devices and the like emitting light on their own, and liquid crystal display (LCD) devices and the like requiring a separate light source. Display devices have been applied to a wide range of devices such as a computer monitor, a TV and a personal mobile device, and research has been conducted into a display device that secures a reduction in volume and lightweight as well as having a wide display area. In recent years, display devices including a light emitting diode (LED) draw public attention as a next-generation display device. LEDs are made of an inorganic material rather than an organic material, ensuring excellent reliability and a greater lifespan than a liquid crystal display device or an organic light emitting display device. Additionally, LEDs may ensure excellent light emission efficiency, excellent shock-resistance and excellent reliability as well as fast lighting speed and may display a high-luminance image. BRIEF SUMMARY Various embodiments of the present disclosure provide a display device that can alternately drive a pair of sub pixels emitting light of the same color. Various embodiments of the present disclosure provide a display device that can alternately drive a plurality of sub pixels by using a multiplexer (MUX) circuit. Various embodiments of the present disclosure provide a display device that can ensure a simplified structure of a data driver. Various embodiments of the present disclosure provide a display device in which the number of a plurality of data pads can decrease. Various embodiments of the present disclosure provide a display device in which the number of the plurality of data pads can decrease so that the number of channels decreases and which can ensure a simplified structure of the data driver. Various embodiments of the present disclosure provide a display device that can ensure a simplified structure of the data driver and a simplified structure of the plurality of data pads, reducing costs. Various embodiments of the present disclosure provide a display device that can discharge a voltage of a data line connected to a sub pixel that is not driven for a non-driving period to reduce or minimize a failure of abnormal driving of the sub pixel. Various embodiments of the present disclosure provide a display device that can reduce or minimize a failure of non-emission of a part of sub pixels in a low gradation image. Various embodiments of the present disclosure provide a display device in which another element can be disposed in a vacant space between a data line not connected to the MUX circuit and a data pad to use the surface area of a non-active area efficiently. Technical benefits of the present disclosure are not limited to the above-mentioned benefits, and other benefits, which are not mentioned above, can be clearly understood by those skilled in the art from the following descriptions. According to an aspect of the present disclosure, a display device comprises a plurality of sub pixels, a plurality of data lines connected to each of the plurality of sub pixels, and a MUX circuit connected to a pair of adjacent data lines among the plurality of data lines, the MUX circuit comprising a charge transistor connected to each of the pair of data lines, and a discharge transistor connected to each of the pair of data lines. Accordingly, the MUX circuit comprises the discharge transistor discharging a voltage of the data line, to reduce or minimize a failure of abnormal driving of sub pixels connected to a part of the data lines. According to another aspect of the present disclosure, a display device comprises a substrate configured to include an active area and a non-active area, a plurality of data lines configured to extend from the non-active area to the active area, a plurality of data pads disposed in the non-active area, and a plurality of MUX circuits disposed in the non-active area and connected between the plurality of data lines and the plurality of data pads, each of the plurality of MUX circuits comprising a plurality of first charge transistors connected to a part of the plurality of data lines, a plurality of second charge transistors connected to a rest of the plurality of data lines, a plurality of first discharge transistor connected to the part of the plurality of data lines, and a plurality of second discharge transistors connected to the rest of the plurality of data lines, wherein the plurality o