JP-7855762-B2 - Display device

JP7855762B2JP 7855762 B2JP7855762 B2JP 7855762B2JP-7855762-B2

Inventors

申相一
李忠勳
朴泳柱
楊昌潤
梁浩然

Assignees

エルジーディスプレイカンパニーリミテッド

Dates

Publication Date: 20260508
Application Date: 20250425
Priority Date: 20240425

Claims (20)

A first subpixel including a first light-emitting element that emits light of a first color, and a first drive transistor that drives the first light-emitting element, A second subpixel including a second light-emitting element that emits a second color of light, and a second drive transistor that drives the second light-emitting element, At least one first dummy hole is placed in the first drive transistor, This includes at least one second dummy hole located in the second drive transistor, A display device in which the total aperture area of at least one first dummy hole of the first drive transistor is different from the total aperture area of at least one second dummy hole of the second drive transistor.
The display device according to claim 1, wherein the total aperture area of at least one first dummy hole of the first drive transistor is greater than the total aperture area of at least one second dummy hole of the second drive transistor.
The display device according to claim 1, wherein the number of at least one first dummy holes in the first drive transistor is greater than the number of at least one second dummy holes in the second drive transistor.
The display apparatus according to claim 1, wherein the first subpixel further comprises at least one peripheral dummy hole disposed in the insulating layer surrounding the first drive transistor.
A third subpixel including a third light-emitting element that emits a third color of light, and a third drive transistor that drives the third light-emitting element, Further including at least one third dummy hole located in the third drive transistor, The display device according to claim 1, wherein the total opening area of the at least one third dummy hole of the third drive transistor is the same as the total opening area of the at least one first dummy hole of the first drive transistor and the total opening area of the at least one second dummy hole of the second drive transistor, or is different from the total opening area of the at least one first dummy hole of the first drive transistor and the total opening area of the at least one second dummy hole of the second drive transistor.
The first drive transistor further includes a first dummy electrode connected to the first gate electrode of the first drive transistor via at least one first dummy hole, The second drive transistor further includes a second dummy electrode connected to the second gate electrode of the second drive transistor via at least one second dummy hole, The display apparatus according to claim 5, wherein the third drive transistor further includes a third dummy electrode connected to the third gate electrode of the third drive transistor via at least one third dummy hole.
The display device according to claim 5, wherein the aperture area of each of the at least one first to third dummy holes is the same as the aperture area of each of the at least one contact holes arranged in the first to third subpixels.
The first to third subpixels are, respectively, a blue subpixel, a green subpixel, and a red subpixel. The total aperture area of at least one first dummy hole of the first drive transistor for the blue subpixel is greater than the total aperture area of at least one second dummy hole of the second drive transistor for the green subpixel, and greater than the total aperture area of at least one third dummy hole of the third drive transistor for the red subpixel. The display device according to claim 5, wherein the total aperture area of at least one second dummy hole of the second drive transistor and the total aperture area of at least one third dummy hole of the third drive transistor are the same.
The first to third subpixels are, respectively, a blue subpixel, a green subpixel, and a red subpixel. The number of at least one first dummy holes in the first drive transistor of the blue subpixel is greater than the number of at least one second dummy holes in the second drive transistor of the green subpixel, and greater than the number of at least one third dummy holes in the third drive transistor of the red subpixel. The display device according to claim 5, wherein the number of at least one second dummy holes of the second drive transistor and the number of at least one third dummy holes of the third drive transistor are the same.
A first light-emitting element that emits light of a first color, a first drive transistor that drives the first light-emitting element, and a first subpixel including at least one first dummy hole superimposed on the first gate electrode of the first drive transistor, A second light-emitting element that emits a second color of light, a second drive transistor that drives the second light-emitting element, and a second subpixel including at least one second dummy hole superimposed on the second gate electrode of the second drive transistor, A display device comprising a third light-emitting element that emits a third color of light, a third drive transistor that drives the third light-emitting element, and a third subpixel including at least one third dummy hole superimposed on the third gate electrode of the third drive transistor.
The total opening area of the at least one first dummy hole is different from the total opening area of the at least one second dummy hole and the total opening area of the at least one third dummy hole. The display device according to claim 10, wherein the total opening area of the at least one second dummy hole is the same as or different from the total opening area of the at least one third dummy hole.
The display device according to claim 11, wherein the number of at least one first dummy holes of the first drive transistor is greater than the number of at least one second dummy holes of the second drive transistor, and greater than the number of at least one third dummy holes of the third drive transistor.
The display device according to claim 11, wherein the total opening area of at least one first dummy hole of the first drive transistor is greater than the total opening area of at least one second dummy hole of the second drive transistor, and greater than the total opening area of at least one third dummy hole of the third drive transistor.
The display device according to claim 11, wherein the number or total aperture area of at least one second dummy hole of the second drive transistor is the same as the number or total aperture area of at least one third dummy hole of the third drive transistor.
The display apparatus according to claim 11, wherein the opening area of each of the first to third dummy holes is the same as the opening area of each of the at least one contact holes arranged in the plurality of insulating layers of the first to third subpixels.
A first dummy electrode connected to the first gate electrode via at least one first dummy hole of the first drive transistor, A second dummy electrode connected to the second gate electrode via at least one second dummy hole of the second drive transistor, The third dummy electrode is connected to the third gate electrode via at least one third dummy hole of the third drive transistor, The area of the first dummy electrode is different from the area of the second dummy electrode and the area of the third dummy electrode. The display device according to claim 11, wherein the area of the second dummy electrode is the same as or different from the area of the third dummy electrode.
The display apparatus according to claim 11, wherein at least one of the first to third dummy holes is filled with the upper insulating layer of the first to third gate electrodes.
The display apparatus according to claim 11, wherein the first subpixel further comprises a plurality of peripheral dummy holes disposed in a plurality of insulating layers surrounding the first drive transistor.
The display device according to claim 11, wherein the aperture ratios of the first to third light-emitting elements are different.
The brightness variation characteristics due to temperature of the first to third light-emitting elements are different, or the critical voltage variation amount due to temperature of the first drive transistor is different from the critical voltage variation amount due to temperature of the second drive transistor and the critical voltage variation amount due to temperature of the third drive transistor. The display device according to claim 11, wherein the critical voltage fluctuation amount due to the temperature of the second drive transistor is the same as or different from the critical voltage fluctuation amount due to the temperature of the third drive transistor.

Description

This specification relates to a display device capable of reducing brightness and color coordinate fluctuations caused by temperature variations. Electroluminescence displays (EPDs) utilize self-emissive elements, offering advantages such as high brightness, low driving voltage, the ability to create ultra-thin films, and the flexibility to be implemented in various shapes. Electroluminescent display devices have light-emitting elements whose brightness fluctuates with temperature, and therefore, brightness fluctuations can occur due to temperature changes. The background information described above is technical information possessed by the inventors of this specification for the purpose of deriving the examples herein, or acquired in the process of deriving the examples herein, and does not necessarily constitute prior art that was disclosed to the general public before the filing of this specification. This is a block diagram schematically showing the configuration of a display device according to one embodiment.This figure illustrates a drive transistor structure having a dummy hole according to one embodiment.This figure illustrates a drive transistor structure having a dummy hole according to one embodiment.This figure illustrates a drive transistor structure having a dummy hole according to one embodiment.This figure illustrates a drive transistor structure having a dummy hole according to one embodiment.This figure illustrates a drive transistor structure having a dummy hole according to one embodiment.This figure illustrates a drive transistor structure having a dummy hole according to one embodiment.This figure illustrates a drive transistor structure having a dummy hole according to one embodiment.This figure illustrates a portion of the pixel array of a display device according to one embodiment.This figure illustrates a portion of the pixel array of a display device according to one embodiment.This is an equivalent circuit diagram illustrating a subpixel configuration according to one embodiment.This figure illustrates the subpixel layout structure according to a comparative example and one embodiment.This figure illustrates the subpixel layout structure according to a comparative example and one embodiment.This figure illustrates the subpixel layout structure according to a comparative example and one embodiment.This figure illustrates the subpixel layout structure according to a comparative example and one embodiment.This is a cross-sectional view illustrating the structure of a subpixel according to one embodiment.This graph compares the temperature-luminance sensitivity of a display device using a comparative example and an embodiment.This graph compares the temperature and color sensitivity of a display device using a comparative example and an embodiment.This figure compares the change in the white color coordinate due to temperature fluctuations in a display device in a comparative example and an embodiment.This figure compares the change in the white color coordinate due to temperature fluctuations in a display device in a comparative example and an embodiment.This figure compares the change in the white color coordinate due to temperature fluctuations in a display device in a comparative example and an embodiment.This figure compares the change in the white color coordinate due to temperature fluctuations in a display device in a comparative example and an embodiment. The advantages and features of this specification, as well as the methods for achieving them, will become apparent by referring to the examples described below in detail with accompanying figures. However, this specification is not limited to the examples disclosed below, but can be embodied in a variety of different forms, and these examples are provided merely to complete the disclosure of this specification and to fully inform those with ordinary skill in the art to which this specification belongs of the scope of the invention, and this specification is defined only by the scope of the claims. The shapes, sizes, proportions, angles, numbers, etc., disclosed in the figures illustrating the embodiments of this specification are illustrative, and this specification is not limited to what is shown in the figures. Throughout the specification, the same reference numeral refers to the same component. Where a specific description of the relevant prior art would unnecessarily obscure the gist of this specification, such detailed description is omitted. Where "includes," "has," "consists of," etc., used in this specification, other parts may be added unless "only" is used. When a component is expressed singularly, it includes multiple components unless otherwise explicitly stated. In interpreting the constituent elements, even without a separate explicit mention of the error range, it shall be interpreted as including the error range. When describing spatial relationships, for example, when describing the positional relationshi