US-12628619-B2 - Display device

US12628619B2US 12628619 B2US12628619 B2US 12628619B2US-12628619-B2

Abstract

A display device can include a substrate including a plurality of pixels, a plurality of light emitting diodes disposed in each of the plurality of pixels, a color conversion member disposed over at least two light emitting diodes among the plurality of light emitting diodes in one pixel, and a light shielding pattern disposed over at least one light emitting diode among the plurality of light emitting diodes in the one pixel for forming a black sub pixel that does not emit light outside of the display device. Also, the color conversion member includes a color conversion layer and a color filter disposed on the color conversion layer.

Inventors

Seeun Kim
Jongsung KIM
Hyungon KIM
Youngin JANG

Assignees

LG DISPLAY CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20241104
Priority Date: 20221229

Claims (20)

1 . A display device, comprising: a substrate including a plurality of pixels; a plurality of light emitting diodes disposed in each of the plurality of pixels; a color conversion member disposed over at least two light emitting diodes among the plurality of light emitting diodes in one pixel; and a light shielding pattern disposed over at least one light emitting diode among the plurality of light emitting diodes in the one pixel for forming a black sub pixel that does not emit light outside of the display device, wherein the color conversion member includes a color conversion layer and a color filter disposed on the color conversion layer.
2 . The display device according to claim 1 , wherein the plurality of light emitting diodes all include same type of light emitting diode.
3 . The display device according to claim 1 , wherein each of the plurality of light emitting diodes is a blue light emitting diode.
4 . The display device according to claim 1 , wherein each of the plurality of pixels includes a first sub pixel, a second sub pixel, a third sub pixel, and one or more black sub pixels, and wherein one of the plurality of light emitting diodes is disposed in each of the first sub pixel, the second sub pixel, the third sub pixel, and the one or more black sub pixels.
5 . The display device according to claim 4 , wherein the color conversion member is disposed in each of the first sub pixel, the second sub pixel, and the third sub pixel.
6 . The display device according to claim 5 , wherein the light shielding pattern is disposed to overlap with one or more light emitting diodes in the one or more black sub pixels.
7 . The display device according to claim 6 , further comprising: a black matrix disposed over the same layer as the light shielding pattern, wherein the black matrix includes an opening overlapping with the color conversion member of the first sub pixel, the second sub pixel, and the third sub pixel.
8 . The display device according to claim 7 , wherein the black matrix is integrally formed with the light shielding pattern to cover the one or more black sub pixels.
9 . The display device according to claim 7 , wherein the one or more black sub pixels include one or more defective light emitting diodes.
10 . The display device according to claim 7 , wherein the one or more black sub pixels include one or more non-defective light emitting diodes configured to emit light.
11 . The display device according to claim 4 , wherein the color conversion member includes: a first color conversion member disposed in the first sub pixel to convert a light emitted from the corresponding light emitting diode into red light; a second color conversion member disposed in the second sub pixel to convert a light emitted from the corresponding light emitting diode into green light; and a third color conversion member disposed in the third sub pixel to convert a light emitted from the corresponding light emitting diode into blue light.
12 . The display device according to claim 6 , wherein some pixels among the plurality of pixels have a different arrangement of the first sub pixel, the second sub pixel, the third sub pixel, and the one or more black sub pixels from other pixels among the plurality of pixels.
13 . The display device according to claim 1 , further comprising: a data line connected to the plurality of pixels; and a plurality of scan lines connected to the plurality of pixels to apply a scan signal, wherein each of the plurality of pixels includes a first sub pixel, a second sub pixel, a third sub pixel, and one or more black sub pixels, and wherein the first sub pixel, the second sub pixel, the third sub pixel, and the one or more black sub pixels which form one pixel among the plurality of pixels are connected to a same data line, and are connected to different scan lines among the plurality of scan lines.
14 . The display device according to claim 13 , wherein when the scan signal is applied to one or more scan lines connected to the one or more black sub pixels among the plurality of scan lines, a data voltage corresponding to a black image is applied to the data line.
15 . The display device according to claim 13 , wherein the scan signal is applied at different timings to the first sub pixel, the second sub pixel, the third sub pixel, and the one or more black sub pixels which form the one pixel.
16 . The display device according to claim 15 , wherein an order of applying the scan signal to each of the first sub pixel, the second sub pixel, the third sub pixel, and the one or more black sub pixels of some pixels among the plurality of pixels is different from an order of applying the scan signal to each of the first sub pixel, the second sub pixel, the third sub pixel, and the one or more black sub pixel in other pixels among the plurality of pixels.
17 . The display device according to claim 13 , wherein the substrate includes a display area and a non-display area adjacent to the display area, the display device further comprises: a gate driver mounted in the display area in a gate in active area manner; a side line disposed along a side surface of the substrate to electrically connect a first pad electrode on a front surface of the substrate to a second pad electrode on a rear surface of the substrate.
18 . The display device according to claim 17 , further comprising a data driver and a timing controller disposed over the rear surface of the substrate.
19 . The display device according to claim 1 , further comprising: a light shielding layer disposed under an active layer of a driving transistor connected to one of the plurality of light emitting diodes.
20 . The display device according to claim 19 , wherein the light shielding layer is electrically connected to a source electrode or a drain electrode of the driving transistor.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. application Ser. No. 18/202,807, filed on May 26, 2023 (now U.S. Pat. No. 12,165,932 issued on Dec. 10, 2024), which claims the benefit and priority to Korean Patent Application No. 10-2022-0189106 filed in the Republic of Korea on Dec. 29, 2022, the entirety of all these applications being expressly incorporated by reference for all purposes as if fully set forth herein. BACKGROUND Technical Field The present disclosure relates to a display device, and more particularly to, for example, without limitation, a display device using a light emitting diode (LED). Description of the Related Art Among display devices, which are used for a monitor of a computer, a television, or a cellular phone, there are an organic light emitting display (OLED) device which is a self-emitting device and a liquid crystal display (LCD) device which requires a separate light source (e.g., a blacklight unit). An applicable range of the display device is diversified to personal digital assistants as well as monitors of computers and televisions, and a display device with a large display area and a reduced volume and weight is being studied. Further, a display device including a light emitting diode (LED) is attracting attention as the next generation display device. Since the LED is formed of an inorganic material, rather than an organic material, reliability is excellent so that a lifespan is longer than that of the liquid crystal display device or the organic light emitting display device. Further, the LED has a fast lighting speed, excellent luminous efficiency, and a strong impact resistance so that stability is excellent and an image having a high luminance can be displayed. However, when LEDs are transferred to a substrate, alignment and placement issues can occur, which can result in some defective sub pixels. This especially can be an issue when trying to transfer and position thousands and even millions of micro LEDs onto the substrate. Thus, there exists a need for an efficient process and configuration for forming sub pixels that can correct for any defective sub pixels that may occur while also minimizing the use of unnecessary redundant or backup sub pixels. The description provided in the description of the related art section should not be assumed to be prior art merely because it is mentioned in or associated with the description of the related art section. The description of the related art section may include information that describes one or more aspects of the subject technology. SUMMARY OF THE DISCLOSURE An object to be achieved by the present disclosure is to provide a display device in which extra or backup sub pixels to be used for when there is a defective sub pixel can be reduced or minimized, and to provide for a more efficient manufacturing process and configuration. Another object to be achieved by the present disclosure is to provide a display device in which a color conversion member and a black matrix are formed according to a position of a defective sub pixel. Still another object to be achieved by the present disclosure is to provide a display device which can reduce a manufacturing cost by reducing a number of light emitting diodes that are used. Still another object to be achieved by the present disclosure is to provide a display device in which a process of repairing a defective sub pixel can be eliminated or reduced by further transferring a light emitting diode to simplify the process. Still another object to be achieved by the present disclosure is to provide a display device in which only a same type of light emitting diode is used, in order to increase a transferring yield (e.g., using only light emitting diodes of a same color, such as blue). Objects of the present disclosure are not limited to the above-mentioned objects, and other objects, 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 includes a substrate in which a plurality of pixels is defined; a plurality of light emitting diodes disposed in the plurality of pixels; a color conversion member disposed on some light emitting diodes among the plurality of light emitting diodes; and a light shielding pattern which is disposed on the remaining light emitting diode of the plurality of light emitting diodes, and each of the plurality of pixels includes one first sub pixel, one second sub pixel, one third sub pixel, and one or more black sub pixels. Accordingly, an extra sub pixel which will be replaced with the defective sub pixel is formed, and the black sub pixel is formed in consideration of the position of the defective sub pixel to simplify the repair process and the number of light emitting diodes can be reduced to save the manufacturing cost. Other detailed matters of the example embodiments are included in the detail