Display device

Abstract

The invention discloses a display device which comprises a first substrate, a light-emitting element, a packaging adhesive layer, a supporting structure, a second substrate and a patterned optical layer. The light-emitting element is disposed on the first substrate and has a top surface and a side surface. The packaging adhesive layer is arranged on the first substrate, surrounds the light-emitting element and is in contact with the side surface part. The supporting structure is arranged on the packaging adhesive layer. The second substrate is disposed on the support structure. The patterned optical layer is arranged on the surface, close to the first substrate, of the second substrate. The patterned optical layer is arranged corresponding to the light-emitting element, a gap is arranged between the patterned optical layer and the top surface, and the gap is filled with air or vacuum.

Description

Technical Field

[0001] This invention relates to a display device. Background Technology

[0002] Currently, display devices employ encapsulation structures within the light-emitting elements to prevent moisture intrusion. Generally, these encapsulation structures completely cover the light-emitting elements to prevent moisture damage. However, completely encapsulating the light-emitting elements reduces their light extraction efficiency. Therefore, preventing moisture damage to the light-emitting elements while improving their light extraction efficiency is crucial. Summary of the Invention

[0003] This invention provides a display device, including a first substrate, a light-emitting element, an encapsulating adhesive layer, a support structure, a second substrate, and a patterned optical layer. The light-emitting element is disposed on the first substrate and has a top surface and a side surface. The encapsulating adhesive layer is disposed on the first substrate, surrounding the light-emitting element and partially contacting the side surface. The support structure is disposed on the encapsulating adhesive layer. The second substrate is disposed on the support structure. The patterned optical layer is disposed on the surface of the second substrate near the first substrate. The patterned optical layer is disposed corresponding to the light-emitting element, and a gap exists between the patterned optical layer and the top surface, the gap being filled with air or a vacuum.

[0004] Based on the above, the light-emitting element is disposed on the first substrate, the light-emitting element has a top surface, and the patterned optical layer is disposed on the surface of the second substrate close to the first substrate. The patterned optical layer is disposed corresponding to the light-emitting element, and there is a gap between the patterned optical layer and the top surface of the light-emitting element, and the gap is filled with air or vacuum. In this way, the display device can have better light emission efficiency. Attached Figure Description

[0005] Figure 1 This is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention.

[0006] Figure 2A This is a graph showing the relationship between the viewing angle and brightness of a display device.

[0007] Figure 2B This is a graph showing the relationship between the gap and the light emission efficiency in a display device.

[0008] Figure 2C This is a graph showing the relationship between angle and light emission efficiency in a display device.

[0009] Figure 2D This is a graph showing the relationship between height and light emission efficiency in a display device.

[0010] Figure 2E This is a graph showing the relationship between width and light emission efficiency in a display device.

[0011] In the attached figures, the following labels are used:

[0012] 100: Display device

[0013] 110: First substrate

[0014] 120: Drive circuit layer

[0015] 130: Light-emitting element

[0016] 130a, 130b, 130c: Light-emitting units

[0017] 140: Patterned optical layer

[0018] 140a, 140b, 140c: Patterned optical unit

[0019] 150: Second substrate

[0020] 160: Supporting structure

[0021] 170: Encapsulating adhesive layer

[0022] D1: First Direction

[0023] D2: Second Direction

[0024] D3: Third direction

[0025] E1, E2: Electrodes

[0026] G1: Gap

[0027] H1, H2: Height

[0028] S1, S2, S3, S4: Side view

[0029] T: Top surface

[0030] W1, W2: Width

[0031] θ: included angle Detailed Implementation

[0032] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0033] Figure 1 This is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention.

[0034] A display device includes a first substrate 110, a light-emitting element 130, an encapsulating layer 170, a support structure 160, a second substrate 150, and a patterned optical layer 140. The light-emitting element 130 is disposed on the first substrate 110 and has a top surface T and side surfaces S1 and S2. The encapsulating layer 170 is disposed on the first substrate 110, surrounding the light-emitting element 130 and partially contacting side surfaces S1 and S2. The support structure 160 is disposed on the encapsulating layer 170. The second substrate 150 is disposed on the support structure 160. The patterned optical layer 140 is disposed on the surface of the second substrate 150 near the first substrate 110. The patterned optical layer 140 is disposed corresponding to the light-emitting element 130, and a gap G1 is formed between the patterned optical layer 140 and the top surface T, and the gap G1 is filled with air or a vacuum.

[0035] The refractive index of a vacuum is, for example, 1, while the refractive index of air is, for example, greater than 1. Air can be, for example, helium, neon, argon, krypton, xenon, or radon. The material of the first substrate 110 can be a plate-like material that provides support and reduces bending, wrinkling, and / or deformation of the first substrate 110. For example, the material of the first substrate 110 may include glass, quartz, or other suitable materials, or combinations thereof, but the invention is not limited thereto. The first substrate 110 may be formed by curing a liquid and / or gel-like initial material. In some embodiments, the method of forming the first substrate 110 includes coating the first substrate 110 with a liquid and / or gel-like initial material, and then curing the liquid and / or gel-like initial material using a curing process to form the first substrate 110. The curing process may include thermosetting, photocuring, or a combination of the above curing processes, but the invention is not limited thereto. The material of the first substrate 110 may include a single-layer structure of one of polyimide (PI), polyethylene terephthalate (PET), or other suitable materials, or a stack or mixture of at least two of the above materials, but is not limited thereto. In other words, the first substrate 110 may be a single-layer substrate or a multilayer substrate composed of multiple stacked layers.

[0036] like Figure 1 As shown, the display device 100 also includes a driving circuit layer 120, which is disposed between the encapsulant layer 170 and the first substrate 110. The encapsulant layer 170 has a height H2 along the third direction D3, and the height H2 falls within the range of greater than or equal to 5 micrometers and less than or equal to 13 micrometers.

[0037] Electrodes E1 and E2 are disposed on the driving circuit layer 120, and light-emitting unit 130a is disposed on electrodes E1 and E2, electrically connected to the driving circuit layer 120. Specifically, the driving circuit layer 120 may be, for example, a thin-film transistor structure. The driving circuit layer 120 can be fabricated using manufacturing processes such as thin-film deposition and photolithography. The driving circuit layer 120 can provide appropriate voltages to electrodes E1 and E2, causing light-emitting units 130a, 130b, or 130c to emit light. The light-emitting element 130 can be coupled to the first substrate 110 in the form of a chip-on-board (COB), that is, the light-emitting units 130a, 130b, or 130c of the light-emitting element 130 can be electrically connected to the lines of the driving circuit layer 120 on the first substrate 110 through electrodes E1 and E2. The light-emitting element is, for example, a light-emitting diode. Light-emitting diodes may include, for example, organic light-emitting diodes (OLEDs), miniLEDs, microLEDs, or quantum dot LEDs (QDs, such as QLEDs and QDLEDs), as well as fluorescent, phosphorescent, or other suitable materials, and the materials may be arranged and combined in any way, but are not limited thereto.

[0038] In some embodiments, the light-emitting unit 130a is, for example, a red light-emitting diode, the light-emitting unit 130b is, for example, a green light-emitting diode, and the light-emitting unit 130c is, for example, a blue light-emitting diode.

[0039] The support structure 160 is disposed between the first substrate 110 and the second substrate 120. The material of the support structure 160 may include black photoresist, white photoresist, photoresist of other colors or metal, but is not limited thereto.

[0040] Figure 2A This is a graph showing the relationship between the viewing angle and brightness of the display device. In the display device 100, when the light-emitting element 130 includes a patterned optical layer 140 ( Figure 2A (Medium-thick lines) and light-emitting element 130 do not include patterned optical layer 140 ( Figure 2A (For example, with a medium-fine line), the brightness of the display device 100 can be increased to 111% when the viewing angle falls within ±20 degrees.

[0041] Figure 2B This is a graph showing the relationship between the gap and the light emission efficiency in the display device. The gap G1 between the patterned optical layer 140 and the top surface T can range from 0.2 micrometers to 9 micrometers along the third direction D3, thereby increasing the front light emission efficiency of the display device 100 by, for example, 2% to 12%.

[0042] Figure 2C This is a graph showing the relationship between angle and light emission efficiency in a display device. The patterned optical layer 140 includes side surface S3 and side surface S4, which have an angle θ with the second substrate 150. The angle θ ranges from 20 degrees to 70 degrees, so that the front light emission efficiency of the display device 100 can be increased by, for example, 2% to 12%.

[0043] Figure 2D This is a graph showing the relationship between height and light extraction efficiency in a display device. The patterned optical layer 140 includes patterned optical units 140a, 140b, and 140c. The patterned optical units 140a, 140b, or 140c may have a height H1 along a third direction D3. The height H1 falls within a range greater than or equal to 0 micrometers and less than or equal to 7 micrometers. Thus, the front light extraction efficiency of the display device 100 can be increased, for example, by 2% to 12%.

[0044] Figure 2E This is a graph showing the relationship between width and light emission efficiency in a display device. The light-emitting units 130a, 130b, or 130c of the light-emitting element 130 may have a width W1 along the first direction D1, and the patterned optical units 140a, 140b, or 140c of the patterned optical layer 140 may have a width W2 along the first direction D1. The difference between width W1 and width W2 falls between 4 micrometers and 22 micrometers. Thus, the front light emission efficiency of the display device 100 can be increased, for example, by 2% to 12%.

[0045] In summary, the light-emitting element of the present invention is disposed on a first substrate, the light-emitting element has a top surface, a patterned optical layer is disposed on the surface of a second substrate near the first substrate, the patterned optical layer is disposed corresponding to the light-emitting element, and there is a gap between the patterned optical layer and the top surface of the light-emitting element, and the gap is filled with air or vacuum. In this way, the display device can have better light emission efficiency.

[0046] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A display device, characterized in that, include: First substrate; A light-emitting element is disposed on the first substrate and has a top surface and a first side surface; An encapsulating adhesive layer is disposed on the first substrate, surrounding the light-emitting element and contacting the first side portion; A support structure is disposed on the encapsulating adhesive layer; The second substrate is disposed on the support structure; as well as A patterned optical layer is disposed on the surface of the second substrate near the first substrate. The patterned optical layer is disposed corresponding to the light-emitting element, and there is a gap between the patterned optical layer and the top surface, and the gap is filled with air or vacuum.

2. The display device as claimed in claim 1, characterized in that, The patterned optical layer includes a second side surface, which has an angle with the second substrate, the angle ranging from 20 degrees to 70 degrees.

3. The display device as claimed in claim 1, characterized in that, The gap, in the third direction, ranges from 0.2 micrometers to 9 micrometers.

4. The display device as claimed in claim 1, characterized in that, The light-emitting element includes a first light-emitting unit having a first width along a first direction, and the patterned optical layer includes a first patterned optical unit having a second width along the first direction, wherein the difference between the first width and the second width falls between 4 micrometers and 22 micrometers.

5. The display device as claimed in claim 1, characterized in that, The patterned optical layer includes a first patterned optical unit having a height along a third direction, and the height ranges from greater than 0 micrometers to less than or equal to 7 micrometers.

6. The display device as claimed in claim 1, characterized in that, It also includes a driving circuit layer disposed between the encapsulating adhesive layer and the first substrate, and the encapsulating adhesive layer has a height along a third direction, the height being greater than or equal to 5 micrometers and less than or equal to 13 micrometers.

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