TWI845431B - Display apparatus - Google Patents

Abstract

A display apparatus includes a driving backplane, a light emitting element and a cover layer. The driving backplane includes a substrate, a peripheral trace, a planarization layer and a pad. The peripheral trace is disposed in a peripheral area of ​​the substrate. The planarization layer is disposed in a display area and the peripheral area of ​​the substrate. The planarization layer has a first trench located in the peripheral area. The pad is disposed on the planarization layer and located in the display area. The light-emitting element is disposed on the planarization layer of the driving backplane and is electrically connected to the pad. The cover layer is disposed in the display area and the peripheral area of ​​the driving backplane and covers the light emitting element.

Description

Display device

The present invention relates to an electronic device, and in particular to a display device.

The LED display panel includes a driving backplane and multiple LED elements transferred to the driving backplane. Inheriting the characteristics of LEDs, LED display panels have the advantages of power saving, high efficiency, high brightness and fast response time. In addition, compared with organic LED display panels, LED display panels also have the advantages of easy color adjustment, long luminous life and no image burn-in. Therefore, LED display panels are regarded as the next generation of display technology.

Generally speaking, a covering layer is applied to the LED components of an LED display panel to fix and protect the LED components. In the process of forming the covering layer, a fluid covering material is applied to the driving backplane and then cured to form the covering layer. However, in the process of forming the covering layer, the covering material is prone to overflow, which results in poor reliability of the LED display panel.

The present invention provides a display device with good reliability.

A display device of an embodiment of the present invention includes a driving backplane, at least one light-emitting element and a covering layer. The driving backplane includes a substrate, a peripheral wiring, a flat layer and at least one pad. The substrate has a display area and a peripheral area outside the display area. The peripheral wiring is arranged on the peripheral area of the substrate. The flat layer is arranged on the display area and the peripheral area of the substrate. The flat layer has at least one first trench located in the peripheral area, and at least one first trench at least partially overlaps the peripheral wiring. At least one pad is arranged on the flat layer and is located on the display area. At least one light-emitting element is arranged on the flat layer of the driving backplane and is electrically connected to at least one pad. The covering layer is disposed on the display area and the peripheral area of the driving backplane and covers at least one light-emitting element. A portion of the covering layer fills at least one first trench of the planar layer.

The display device of one embodiment of the present invention includes a driving backplane, at least one light-emitting element and a covering layer. The driving backplane includes a substrate, a peripheral wiring, a planar layer and at least one pad. The substrate has a display area and a peripheral area outside the display area. The peripheral wiring is arranged on the peripheral area of the substrate. The planar layer is arranged on the display area and the peripheral area of the substrate. The planar layer has at least one first trench located in the peripheral area. The vertical projection of at least one first trench on the substrate is located within the vertical projection of the peripheral wiring on the substrate. At least one pad is arranged on the planar layer and is located on the display area. At least one light-emitting element is arranged on the planar layer of the driving backplane and is electrically connected to at least one pad. The covering layer is disposed on the display area and the peripheral area of the driving backplane and covers at least one light-emitting element.

10, 10-1, 10-2: Display device

100: Drive backplane

110: Base

110a: Display area

110b: Peripheral area

120: pad

130: Light-emitting element

BP1, BP2, BP3, BP4, BP5: Barrier protection layer

BP3a, L1a: upper surface

BP5a: Contact window

GI: Gate Insulation Layer

ILD: Interlayer Dielectric

L1: Peripheral routing

M1: first conductive layer

M2: Second conductive layer

M3: The third conductive layer

M4: Fourth conductive layer

M5: Fifth conductive layer

OC: Covering layer

PL1, PL2, PL3, PL4: Flat layer

PL4a, PL4a-1: First channel

PL4b, PL4b-2: blocking structure

S: distance

TFE: packaging layer

W1, W2, W3: Width

Figure 1 is a top view schematic diagram of a display device according to an embodiment of the present invention.

Figure 2 is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention.

Figure 3 is a cross-sectional schematic diagram of a display device of another embodiment of the present invention.

Figure 4 is a cross-sectional schematic diagram of a display device of another embodiment of the present invention.

Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same element symbols are used in the drawings and description to represent the same or similar parts.

It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it may be directly on or connected to another element, or an intermediate element may also exist. Conversely, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intermediate elements. As used herein, "connection" may refer to physical and/or electrical connection. Furthermore, "electrical connection" or "coupling" may mean the presence of other elements between two elements.

As used herein, "approximately", "approximately", or "substantially" includes the stated value and the average value within an acceptable deviation range of a particular value determined by a person of ordinary skill in the art, taking into account the measurement in question and the specific amount of error associated with the measurement (i.e., the limitations of the measurement system). For example, "approximately" can mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, ±5%. Furthermore, as used herein, "approximately", "approximately", or "substantially" can select a more acceptable deviation range or standard deviation based on the optical properties, etching properties, or other properties, and can apply to all properties without a single standard deviation.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by ordinary technicians in the field to which the present invention belongs. It will be further understood that those terms as defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and the present invention, and will not be interpreted as an idealized or overly formal meaning unless expressly defined as such in this document.

FIG. 1 is a top view schematic diagram of a display device according to an embodiment of the present invention. FIG. 2 is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention. FIG. 1 shows the light-emitting element 130, the peripheral trace L1 and the first trench PL4a, while omitting other components.

Referring to FIG. 1 and FIG. 2 , the display device 10 includes a driving backplane 100. The driving backplane 100 includes a substrate 110, a peripheral trace L1, a flat layer PL4, and at least one pad 120. The substrate 110 has a display area 110a and a peripheral area 110b outside the display area 110a. The peripheral trace L1 is disposed on the peripheral area 110b of the substrate 110. The flat layer PL4 is disposed on the display area 110a and the peripheral area 110b of the substrate 110. The pad 120 is disposed on the flat layer PL4 and is located in the display area 110a.

In one embodiment, the driving backplane 100 further includes a semiconductor layer (not shown), a gate insulating layer GI, a first conductive layer M1, an interlayer dielectric layer ILD, a second conductive layer M2, a planar layer PL1, a barrier protection layer BP1, a third conductive layer M3, a planar layer PL2, a barrier protection layer BP2, a fourth conductive layer M4, a planar layer PL3, a barrier protection layer BP3, a fifth conductive layer M5, a barrier protection layer BP1, a third conductive layer M3, a planar layer PL2, a barrier protection layer BP2, a fourth conductive layer M4, a planar layer PL3, a barrier protection layer BP3, a fifth conductive layer M5, a barrier protection layer BP1, a third conductive layer M5, a planar layer PL2, a barrier protection layer BP2, a fourth conductive layer M4, a planar layer PL3, a barrier protection layer BP3, a fifth conductive layer M5, a barrier protection layer BP1, a third conductive layer M3 ... 4 and barrier protection layer BP5, the semiconductor layer is arranged on the display area 110a of the substrate 110, the gate insulation layer GI covers the semiconductor layer, the first conductive layer M1 is arranged on the gate insulation layer GI, the interlayer dielectric layer ILD covers the first conductive layer M1 and the gate insulation layer GI, the second conductive layer M2 is arranged on the interlayer dielectric layer ILD, the planarization layer PL1 covers the second conductive layer M2 and the interlayer dielectric layer ILD, the screen The barrier protection layer BP1 is disposed on the planar layer PL1, the third conductive layer M3 is disposed on the barrier protection layer BP1, the planar layer PL2 covers the third conductive layer M3 and the barrier protection layer BP1, the barrier protection layer BP2 is disposed on the planar layer PL2, the fourth conductive layer M4 is disposed on the barrier protection layer BP2, the planar layer PL3 covers the fourth conductive layer M4 and the barrier protection layer BP2, and the barrier protection layer BP3 is disposed on the planar layer PL2. On the flat layer PL3, the fifth conductive layer M5 is arranged on the barrier protection layer BP3, the flat layer PL4 covers the fifth conductive layer M5 and the barrier protection layer BP3, the barrier protection layer BP4 is arranged on the flat layer PL4, the pad 120 is arranged on the barrier protection layer BP4, the barrier protection layer BP5 is arranged on the barrier protection layer BP4 and a part of the pad 120 and has a contact window BP5a overlapping the pad 120.

In one embodiment, the semiconductor layer may have a semiconductor pattern (not shown) disposed in the display region 110a, the first conductive layer M1 may have a gate (not shown), the second conductive layer M2 may have a source and a drain (not shown) electrically connected to two different regions of the semiconductor pattern, respectively, the semiconductor pattern, the gate, the source and the drain may form a thin film transistor (not shown) driving the backplane 100, and the thin film transistor may be electrically connected to the thin film transistor through a bridge pattern (not shown) of the third conductive layer M3, the fourth conductive layer M4 and/or the fifth conductive layer M5, but the present invention is not limited thereto. In one embodiment, the peripheral trace L1 may belong to the fifth conductive layer M5, but the present invention is not limited thereto.

In one embodiment, the material of the first conductive layer M1, the second conductive layer M2, the third conductive layer M3, the fourth conductive layer M4 and the fifth conductive layer M5 is, for example, metal, the material of the planar layer PL1, the planar layer PL2, the planar layer PL3 and the planar layer PL4 is, for example, an organic insulating material, and the material of the barrier protection layer BP1, the barrier protection layer BP2, the barrier protection layer BP3, the barrier protection layer BP4 and the barrier protection layer BP5 is, for example, an inorganic insulating material, but the present invention is not limited thereto.

The display device 10 further includes at least one light-emitting element 130, which is disposed on the flat layer PL4 of the driving backplane 100 and electrically connected to the pad 120. For example, in one embodiment, the light-emitting element 130 may be disposed on the barrier protection layer BP5 and electrically connected to the pad 120 through the contact window BP5a of the barrier protection layer BP5, but the present invention is not limited thereto. In one embodiment, the light-emitting element 130 is, for example, a micro light-emitting diode (μLED), but the present invention is not limited thereto.

The display device 10 further includes a cover layer OC, which is disposed on the display area 110a and the peripheral area 110b of the driving backplane 100 and covers the light-emitting element 130. In one embodiment, the display device 10 further includes a packaging layer TFE, which is disposed on the cover layer OC and encapsulates the light-emitting element 130 together with the cover layer OC. In one embodiment, the area of the barrier protection layer BP5 located in the peripheral area 110b and not covered by the cover layer OC can be directly connected to the edge of the packaging layer TFE, but the present invention is not limited thereto.

It is worth noting that the planar layer PL4 has at least one first trench PL4a located in the peripheral area 110b. The first trench PL4a at least partially overlaps the peripheral trace L1. In one embodiment, a portion of the cover layer OC is filled into the first trench PL4a of the planar layer PL4. In the process of forming the cover layer OC, the first trench PL4a can be used to prevent the cover layer OC from overflowing.

In one embodiment, the vertical projection of the first trench PL4a on the substrate 110 is within the vertical projection of the peripheral trace L1 on the substrate 110. That is, in one embodiment, the first trench PL4a and the peripheral trace L1 may not intersect. In one embodiment, the first trench PL4a may penetrate the flat layer PL4. In one embodiment, the bottom of the first trench PL4a may include a metal interface (i.e., a portion of the upper surface L1a of the peripheral trace L1) but not a mixed interface of a metal layer and an inorganic layer (i.e., a portion of the upper surface L1a of the peripheral trace L1 and a portion of the upper surface BP3a of the barrier protection layer BP3). The bottom of the first trench PL4a is an interface formed of the same material, which helps to improve the reliability of the display device 10.

In one embodiment, the number of the first trenches PL4a is 2 as an example. However, the present invention is not limited thereto. In other embodiments, the number of the first trenches PL4a may be 1 or more than 3. In one embodiment, the width W1 of the first trench PL4a may be greater than or equal to 15 μm, but the present invention is not limited thereto.

In one embodiment, the planar layer PL4 may further include a blocking structure PL4b, wherein the first trench PL4a is located between the light-emitting element 130 and the blocking structure PL4b. In the process of forming the cover layer OC, if the first trench PL4a cannot completely prevent the cover layer OC from overflowing, the blocking structure PL4b may be used to block it. In one embodiment, the blocking structure PL4b may be selectively a second trench of the planar layer PL4. In one embodiment, the bottom of the second trench (i.e., the blocking structure PL4b) may include an inorganic interface (i.e., a portion of the upper surface BP3a of the barrier protection layer BP3) but not a mixed interface of a metal layer and an inorganic layer (i.e., a portion of the upper surface L1a of the peripheral trace L1 and a portion of the upper surface BP3a of the barrier protection layer BP3). In one embodiment, the width W2 of the second trench (i.e., the blocking structure PL4b) may be greater than or equal to 15μm, but the present invention is not limited thereto.

It must be noted here that the following embodiments use the component numbers and some contents of the previous embodiments, wherein the same numbers are used to represent the same or similar components, and the description of the same technical contents is omitted. For the description of the omitted parts, please refer to the previous embodiments, and the following embodiments will not be repeated.

FIG3 is a cross-sectional schematic diagram of a display device of another embodiment of the present invention. The display device 10-1 of FIG3 is similar to the aforementioned display device 10, and the difference between the two is that the first trench PL4a-1 of the display device 10-1 of FIG3 is different from the first trench PL4a of the aforementioned display device 10. Please refer to FIG3, specifically, in this embodiment, the first trench PL4a-1 is a depression of the planar layer PL4, and does not penetrate the planar layer PL4. The first trench PL4a-1 may be staggered with the peripheral trace L1 or not staggered. In this embodiment, the number of first trenches PL4a-1 is, for example, more than 2, the width W1 of each first trench PL4a-1 may be greater than or equal to 10μm, and the distance S between two adjacent first trenches PL4a-1 may be greater than or equal to 15μm, but the present invention is not limited thereto.

FIG4 is a cross-sectional schematic diagram of a display device of another embodiment of the present invention. The display device 10-2 of FIG4 is similar to the display device 10-1 of FIG3, and the difference between the two is that the blocking structure PL4b-2 of the display device 10-2 of FIG4 is different from the blocking structure PL4b of the display device 10-1 of FIG3. Please refer to FIG4. Specifically, in this embodiment, the blocking structure PL4b-2 may be a protrusion of the flat layer PL4. In this embodiment, the width W3 of the protrusion of the flat layer PL4 (i.e., the blocking structure PL4b-2) may be greater than or equal to 15μm, but the present invention is not limited thereto.

10: Display device

100: Drive backplane

110: Base

110a: Display area

110b: Peripheral area

120: pad

130: Light-emitting element

BP1, BP2, BP3, BP4, BP5: Barrier protection layer

BP3a, L1a: upper surface

BP5a: Contact window

GI: Gate Insulation Layer

ILD: Interlayer Dielectric

L1: Peripheral routing

M1: first conductive layer

M2: Second conductive layer

M3: The third conductive layer

M4: The fourth conductive layer

M5: Fifth conductive layer

OC: Covering layer

PL1, PL2, PL3, PL4: Flat layer

PL4a: First channel

PL4b: blocking structure

TFE: packaging layer

Claims (11)

A display device, comprising: A driving backplane, comprising: A substrate, having a display area and a peripheral area outside the display area; A peripheral trace, disposed on the peripheral area of the substrate; A flat layer, disposed on the display area and the peripheral area of the substrate, wherein the flat layer has at least one first trench located in the peripheral area, and the at least one first trench at least partially overlaps the peripheral trace; and At least one pad, disposed on the flat layer and located on the display area; At least one light-emitting element, disposed on the flat layer of the driving backplane and electrically connected to the at least one pad; and A covering layer is disposed on the display area and the peripheral area of the driving backplane and covers the at least one light-emitting element, wherein a portion of the covering layer fills the at least one first trench of the planar layer. A display device as described in claim 1, wherein a vertical projection of the at least one first trench on the substrate is located within a vertical projection of the peripheral trace on the substrate. The display device as described in claim 1, wherein the planar layer further has a blocking structure, wherein the at least one first trench of the planar layer is located between the at least one light-emitting element and the blocking structure. The display device as described in claim 3, wherein the blocking structure is at least one second trench or at least one protrusion of the planar layer. The display device as described in claim 1, wherein the at least one first trench penetrates the planar layer. The display device as described in claim 1, wherein the at least one first trench is at least one depression of the planar layer. A display device, comprising: A driving backplane, comprising: A substrate, having a display area and a peripheral area outside the display area; A peripheral trace, disposed on the peripheral area of the substrate; A flat layer, disposed on the display area and the peripheral area of the substrate, wherein the flat layer has at least one first trench located in the peripheral area, and a vertical projection of the at least one first trench on the substrate is located within a vertical projection of the peripheral trace on the substrate; and At least one pad, disposed on the flat layer and located on the display area; At least one light-emitting element, disposed on the flat layer of the driving backplane and electrically connected to the at least one pad; and A covering layer is disposed on the display area and the peripheral area of the driving backplane and covers the at least one light-emitting element. The display device as described in claim 7, wherein the planar layer further has a blocking structure, wherein the at least one first trench of the planar layer is located between the at least one light-emitting element and the blocking structure. The display device as described in claim 8, wherein the blocking structure is at least one second trench or at least one protrusion of the planar layer. The display device as described in claim 7, wherein the at least one first trench penetrates the planar layer. The display device as described in claim 7, wherein the at least one first trench is at least one depression of the planar layer.

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