US-12628477-B2 - Display panel and method of fabricating the same

US12628477B2US 12628477 B2US12628477 B2US 12628477B2US-12628477-B2

Abstract

A display panel including a circuit substrate, first display sub-pixels and a repaired display sub-pixel is provided. The first display sub-pixel includes a light-emitting device and a first color conversion pattern. The light-emitting device is disposed on the circuit substrate, and is suitable for emitting first light with a first light-emitting color. The first color conversion pattern is arranged on the light-emitting device, and overlaps the light-emitting device. The first color conversion pattern is suitable for converting the first light-emitting color of the first light into a first color. The first color is different from the first light-emitting color. The repaired display sub-pixel includes a repair light-emitting device arranged on the circuit substrate, and having a second light-emitting color. The second light-emitting color is the same as the first color. A method of fabricating the display panel is also provided.

Inventors

Yang-En Wu
Shih-Hsiung Lin

Assignees

AUO Corporation

Dates

Publication Date: 20260512
Application Date: 20231204
Priority Date: 20230901

Claims (20)

1 . A display panel, comprising: a circuit substrate; a plurality of first display sub-pixels, each comprising: a light-emitting device, disposed on the circuit substrate, adapted to emit first light with a first light-emitting color; and a first color conversion pattern, arranged on the light-emitting device, overlapped with the light-emitting device, and adapted to convert the first light-emitting color of the first light into a first color, wherein the first color is different from the first light-emitting color; and a repaired display sub-pixel, comprising: a repair light-emitting device, arranged on the circuit substrate, and having a second light-emitting color, wherein the second light-emitting color is the same as the first color.
2 . The display panel as claimed in claim 1 , further comprising: a common electrode layer, disposed on the plurality of light-emitting devices of the first display sub-pixels and the repair light-emitting device, electrically connected to the light-emitting devices and the repair light-emitting device, and having an opening overlapped with the repair light-emitting device, wherein the light-emitting devices and the repair light-emitting device are a plurality of vertical type light-emitting devices.
3 . The display panel as claimed in claim 2 , further comprising: a transparent conductive glue layer, filled in the opening of the common electrode layer, wherein the repair light-emitting device is electrically connected to the common electrode layer through the transparent conductive glue layer.
4 . The display panel as claimed in claim 1 , further comprising: a plurality of second display sub-pixels, each including: another light-emitting device, arranged on the circuit substrate, and adapted to emit second light with the first light-emitting color; and a second color conversion pattern, arranged on the another light-emitting device, overlapped with the another light-emitting device, and adapted to convert the first light-emitting color of the second light into a second color, wherein the second color is different from the first color.
5 . The display panel as claimed in claim 1 , further comprising: a barrier wall structure layer, arranged on the light-emitting device and the repair light-emitting device, and comprising: a plurality of first openings, respectively overlapped with the plurality of light-emitting devices of the first display sub-pixels, wherein the plurality of first color conversion patterns are respectively arranged in the first openings; and a second opening, overlapped with the repair light-emitting device, wherein a light-transmitting pattern is disposed in the second opening.
6 . The display panel as claimed in claim 5 , further comprising: a color filter layer, arranged on the plurality of first color conversion patterns, and having a plurality of filter patterns, the filter patterns are respectively overlapped with the first color conversion patterns, wherein the light-transmitting pattern penetrates the color filter layer.
7 . The display panel as claimed in claim 5 , wherein the light-transmitting pattern is doped with a plurality of scattering particles.
8 . The display panel as claimed in claim 5 , further comprising: a planarization layer, arranged on the circuit substrate, covering the light-emitting devices, and having an opening overlapped with the repair light-emitting device, wherein the light-transmitting pattern is filled in the opening of the planarization layer.
9 . The display panel as claimed in claim 5 , further comprising: a light-transmitting substrate, arranged on the light-emitting devices, wherein the light-transmitting pattern penetrates the light-transmitting substrate.
10 . The display panel as claimed in claim 1 , wherein the second light-emitting color of the repair light-emitting device is red.
11 . The display panel as claimed in claim 1 , wherein the repair light-emitting device is a ternary light-emitting diode.
12 . The display panel as claimed in claim 1 , wherein the circuit substrate is configured with a plurality of sub-pixel areas, the first display sub-pixels and the repaired display sub-pixel are respectively arranged in the sub-pixel areas, each sub-pixel area is further provided with at least one bonding pad and at least one repair bonding pad, the light-emitting device is electrically bonded to the at least one bonding pad, and the repair light-emitting device is electrically bonded to the at least one repair bonding pad.
13 . The display panel as claimed in claim 1 , wherein the circuit substrate is configured with a plurality of sub-pixel areas, each of the sub-pixel areas is configured with at least one bonding pad, the at least one boding pad has an initial bonding position and a repair bonding position, and the initial bonding position of the at least one bonding pad in each of the sub-pixel areas is bonded with the light-emitting device of one of the first display sub-pixels, and the repair light-emitting device is bonded to the repair bonding position of the at least one bonding pad in one of the sub-pixel areas.
14 . The display panel as claimed in claim 1 , further comprising: a barrier wall structure layer, arranged on the circuit substrate, and having a plurality of first openings and a second opening, the plurality of light-emitting devices are respectively arranged in the first openings, and the repair light-emitting device is arranged in the second opening, wherein the plurality of first color conversion patterns are respectively arranged in the first openings, and cover the light-emitting devices, a light-transmitting pattern is arranged in the second opening, and the light-transmitting pattern covers the repair light-emitting device.
15 . A method of fabricating a display panel, comprising: electrically bonding a plurality of light-emitting devices to a circuit substrate, wherein each of the light-emitting device is adapted to emit first light with a first light-emitting color; forming a plurality of color conversion patterns, wherein the plurality of color conversion patterns are respectively overlapped with the plurality of light-emitting devices, each of the color conversion patterns is adapted to convert the first light-emitting color of the first light into a first color, and the first color is different from the first light-emitting color; performing an inspection step to confirm a damaged one of the light-emitting devices; and electrically bonding a repair light-emitting device to the circuit substrate to replace the damaged one of the light-emitting devices, wherein the repair light-emitting device has a second light-emitting color, and the second light-emitting color is the same as the first color.
16 . The method of fabricating the display panel as claimed in claim 15 , further comprising: respectively forming a plurality of filter patterns on the color conversion patterns, wherein after detecting the damaged one of the light-emitting devices, one of the filter patterns overlapped with the damaged one of the light-emitting devices is removed.
17 . The method of fabricating the display panel as claimed in claim 15 , further comprising: forming a common electrode layer on the light-emitting devices, wherein the common electrode layer is electrically connected to the light-emitting devices, after detecting the damaged one of the light-emitting devices, a portion of the common electrode layer overlapped with the damaged one of the light-emitting devices is removed to form an opening.
18 . The method of fabricating the display panel as claimed in claim 17 , wherein after completing the bonding step of the repair light-emitting device, a transparent conductive glue layer is formed in the opening of the common electrode layer.
19 . The method of fabricating the display panel as claimed in claim 15 , further comprising: forming a barrier wall structure layer with a plurality of first openings, wherein the color conversion patterns are respectively formed in the first openings.
20 . The method of fabricating the display panel as claimed in claim 15 , further comprising: after forming the color conversion patterns on a light-transmitting substrate, assembling the circuit substrate with the light-transmitting substrate.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the priority benefit of Taiwan application serial no. 112133197, filed on Sep. 1, 2023. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. BACKGROUND Technical Field The invention relates to a display technology and a fabricating method, and particularly relates to display panel and a method of fabricating the same. Description of Related Art In addition to advantages of low energy consumption and long material life, micro-LED displays also have excellent optical performance, such as high color saturation, fast response and high contrast. In order to achieve lower production costs and larger product design margins, a manufacturing technology of the micro-LED displays may adopt mass transfer or wafer to wafer bonding to transfer micro-LED chips pre-made by a chip manufacturer to driving circuit boards of different products. In order to meet the demand for color display, a display using monochromatic micro-LEDs in collaboration with a color conversion technology is proposed. After completing transfer of the monochromatic chips, this type of display may further form a color conversion layer above the chips to convert a color of light emitted by the chips into a required display color. However, if dead pixels are found during the subsequent manufacturing process or after a durability test, the arrangement of the color conversion layer may greatly increase repair difficulty of such type of display, making it impossible to repair and resulting in a low yield rate. SUMMARY The invention is directed to a display panel with a color conversion pattern, which has high repairability after a durability test. The invention is directed to a method for fabricating a display panel, which significantly reduces generation of scrap products and improve a production yield. The invention provides a display panel including a circuit substrate, a plurality of first display sub-pixels and a repaired display sub-pixel. The first display sub-pixel includes a light-emitting device and a first color conversion pattern. The light-emitting device is disposed on the circuit substrate, and is suitable for emitting first light with a first light-emitting color. The first color conversion pattern is arranged on the light-emitting device, and is overlapped with the light-emitting device. The first color conversion pattern is suitable for converting the first light-emitting color of the first light into a first color. The first color is different from the first light-emitting color. The repaired display sub-pixel includes a repair light-emitting device arranged on the circuit substrate, and has a second light-emitting color. The second light-emitting color is the same as the first color. The invention provides a method of fabricating a display panel including following steps. A plurality of light-emitting devices are electrically bonded to a circuit substrate, a plurality of color conversion patterns are formed, an inspection step is performed to confirm a damaged one of the plurality of light-emitting devices, and a repair light-emitting device is electrically bonded to the circuit substrate to replace the damaged one of the light-emitting devices. Each of the light-emitting devices is adapted to emit first light with a first light-emitting color. The plurality of color conversion patterns are respectively overlapped with the plurality of light-emitting devices. Each of the color conversion patterns is adapted to convert the first light-emitting color of the first light into a first color. The first color is different from the first light-emitting color. The repair light-emitting device has a second light-emitting color, and the second light-emitting color is the same as the first color. Based on the above descriptions, in the display panel and the method of fabricating the same according to an embodiment of the invention, the plurality of display sub-pixels used to display the first color are each provided with a light-emitting device and a color conversion pattern overlapped with each other, where the color conversion pattern is suitable for converting the light-emitting color of the light-emitting device into the first color. If the light-emitting device of one of the display sub-pixels is detected to be abnormal or damaged, the abnormal or damaged light-emitting device may be replaced by the repair light-emitting device having the first color. In this way, the repairability of the display panel after product test in the back-end process may be greatly improved, which helps to reduce generation of scrap products and improve the production yield. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and,