CN114373854A - Display device - Google Patents

Display device Download PDF

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Publication number
CN114373854A
CN114373854A CN202210016202.XA CN202210016202A CN114373854A CN 114373854 A CN114373854 A CN 114373854A CN 202210016202 A CN202210016202 A CN 202210016202A CN 114373854 A CN114373854 A CN 114373854A
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China
Prior art keywords
display
display device
light emitting
units
sidewall
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CN202210016202.XA
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Chinese (zh)
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CN114373854B (en
Inventor
俞方正
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AU Optronics Corp
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AU Optronics Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements
    • H01L33/60—Reflective elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/50—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels
    • G02B30/52—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels the 3D volume being constructed from a stack or sequence of 2D planes, e.g. depth sampling systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission
    • H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars
    • H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/856—Arrangements for extracting light from the devices comprising reflective means
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Vehicle Body Suspensions (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)

Abstract

A display device comprises a substrate, an active element layer arranged on the substrate, a plurality of display units arranged on the active element layer, and a light reflecting structure arranged on the active element layer. The light reflecting structure includes a plurality of repeating units. Each repeating unit has four open areas. A corresponding display unit is arranged in each opening area. The light reflecting structure comprises a first retaining wall part and a second retaining wall part. The distance between the top surface of the first retaining wall part and the substrate is greater than the distance between the top surface of the second retaining wall part and the substrate. The display unit in each repeating unit is separated by the first barrier portion, and the display unit in each repeating unit is separated from the display unit in the adjacent other repeating unit by the second barrier portion.

Description

Display device
Technical Field
The present invention relates to a display device.
Background
3D display technology has been of interest to many display manufacturers. Compared with a 2D image, the 3D image can improve the immersion feeling of the user more easily, so that the user can feel the user. Current naked-eye 3D display devices usually have a parallax barrier (parallax barrier) on the display elements (such as pixels or sub-pixels). Through the arrangement of the parallax barrier, the left eye and the right eye of a user can receive information sent by different pixel units, and accordingly a naked-eye 3D effect is obtained. However, the parallax barrier may limit the brightness of the display frame of the display device and the viewing angle of the display frame, thereby affecting the user experience of the 3D display device.
Disclosure of Invention
The invention aims to provide a display device which can improve the brightness of a three-dimensional display mode and the image resolution of a two-dimensional display mode.
At least one embodiment of the present invention provides a display device. The display device comprises a substrate, an active element layer positioned on the substrate, a plurality of display units positioned on the active element layer and a light reflecting structure positioned on the active element layer. The light reflecting structure includes a plurality of repeating units. Each repeating unit has four open areas. A corresponding display unit is arranged in each opening area. The light reflecting structure comprises a first retaining wall part and a second retaining wall part. The distance between the top surface of the first retaining wall part and the substrate is greater than the distance between the top surface of the second retaining wall part and the substrate. The first side wall of each opening area is defined by the first blocking wall part, and the second side wall of each opening area is defined by the second blocking wall part. The included angle between the first side wall and the second side wall is smaller than 90 degrees. The display unit in each repeating unit is separated by the first barrier portion, and the display unit in each repeating unit is separated from the display unit in the adjacent other repeating unit by the second barrier portion.
The invention has the beneficial effects that through the arrangement of the light reflecting structure, the display unit of the display device can emit light rays with different angles, thereby obtaining a two-dimensional display picture or a three-dimensional display picture. In addition, pixel units with different viewing angles can be obtained without additionally arranging other structures (such as a parallax barrier) for generating parallax, so that the resolution and the brightness of the display device are improved.
Drawings
Fig. 1 is a schematic top view of a display device according to an embodiment of the invention.
Fig. 2A is a partially enlarged schematic view of a display area of a display device according to an embodiment of the invention.
Fig. 2B is a schematic sectional view taken along line a-a' of fig. 2A.
Fig. 2C is a schematic sectional view taken along line b-b' of fig. 2A.
Fig. 3 is a partially enlarged schematic view of a display area of a display device in a first three-dimensional display mode according to an embodiment of the invention.
Fig. 4 is a partially enlarged schematic view of a display area of a display device in a second three-dimensional display mode according to an embodiment of the invention.
Fig. 5 is a partially enlarged schematic view of a display area of a display device in a two-dimensional display mode according to an embodiment of the invention.
Fig. 6 is a schematic cross-sectional view of a display device according to an embodiment of the invention.
Fig. 7 is a schematic cross-sectional view of a display device according to an embodiment of the invention.
Fig. 8A is a partially enlarged schematic view of a display area of a display device in a three-dimensional display mode according to an embodiment of the invention.
Fig. 8B is a schematic sectional view along the line c-c' of fig. 8A.
Fig. 8C is a schematic sectional view taken along line d-d' of fig. 8A.
Fig. 9 is a partially enlarged schematic view of a display area of a display device in a two-dimensional display mode according to an embodiment of the invention.
The reference numbers are as follows:
1,2,3,4 display device
2DPX,2DHPX,2DVPX two-dimensional image pixels
3DPX three-dimensional image pixels
3DSP1, 3DSP2, 3DSP3, 3DSP4 Pixel Unit
DU display unit
100 base
110 active device layer
110t upper surface
112 active element
114 conductive structure
116 insulating structure
118 contact pad
120 reflecting structure
130 packaging adhesive
B1 first retaining wall part
B2 second retaining wall part
B1t, B2t, PFt Top surface
DA display area
ED1 Red light-emitting element
ED2 Green light-emitting element
ED3 blue light-emitting element
HD: transverse direction
L is light
L1, L2, L3, L4, L12, L34 Direction
O open area
PA peripheral area
PF platform structure
RL length
RU repeating Unit
S1 first side wall
S2 second side wall
S3 third side wall
SW1, SW2 lateral surface
T1, T2, T3 thickness
VD longitudinal direction
X1, X2, X3 distance
W is width
Z is the distance between
Angle of alpha, beta
Theta 1, theta 2 and theta 3 included angles
Detailed Description
Fig. 1 is a schematic top view of a display device according to an embodiment of the invention.
Referring to fig. 1, in the present embodiment, the display device 1 includes a display area DA and a peripheral area PA. In some embodiments, the display device 1 includes a plurality of display modes, such as a first three-dimensional display mode, a second three-dimensional display mode, and a two-dimensional display mode. For example, the display device 1 may be changed to a different display mode by switching the operation mode of the display units of the display area DA of the display device 1. For the display mode of the display device 1 and the arrangement of the display units in the display area DA, reference is made to the following description.
Fig. 2A is a partially enlarged schematic view of a display area of a display device according to an embodiment of the invention. For example, fig. 2A is a partially enlarged schematic view of the display area DA of the display device 1. Fig. 2B is a schematic sectional view taken along line a-a' of fig. 2A. Fig. 2C is a schematic sectional view taken along line b-b' of fig. 2A.
Referring to fig. 1 and fig. 2A to 2C, the display device 1 includes a substrate 100, an active device layer 110, a plurality of display units DU, and a light reflecting structure 120 disposed on the active device layer 110.
The substrate 100 may be made of glass, quartz, organic polymer, opaque/reflective material (e.g., conductive material, metal, wafer, ceramic, or other suitable material) or other suitable material. If a conductive material or metal is used, an insulating layer (not shown) is formed on the substrate 100 to prevent short circuit.
The active device layer 110 is disposed on the substrate 100 and includes an active device 112, a conductive structure 114, an insulating structure 116, and a pad 118. The insulating structure 116 is, for example, a single-layer or multi-layer structure. In other words, the present embodiment does not limit the insulating structure 116 to be only a single insulating layer. The active device 112 is disposed in the insulating structure 116. The active device 112 is, for example, any type of thin film transistor. In some embodiments, the active device layer 110 further includes a signal line (not shown) electrically connected to the active device 112. The active device 112 is electrically connected to the pad 118 through the conductive structure 114. The conductive structure 114 is, for example, a single conductive layer or a plurality of conductive layers. The pad 118 is disposed on the surface of the insulating structure 116.
A plurality of display units DU are located on the active element layer 110. In the present embodiment, each display unit DU includes a plurality of light emitting elements with different colors, such as a red light emitting element ED1, a green light emitting element ED2, and a blue light emitting element ED3, but the invention is not limited thereto. In some embodiments, each display unit DU further includes light emitting elements of other colors. The red light emitting element ED1, the green light emitting element ED2, and the blue light emitting element ED3 are, for example, organic light emitting diodes, micro light emitting diodes, or other types of light emitting elements. The red light emitting device ED1, the green light emitting device ED2, and the blue light emitting device ED3 are electrically connected to the corresponding active device 112 through the corresponding pads 118, respectively. In the present embodiment, the red light emitting element ED1, the green light emitting element ED2, and the blue light emitting element ED3 are independently switchable from each other.
In some embodiments, each of the red light emitting device ED1, the green light emitting device ED2, and the blue light emitting device ED3 includes a stack of N-type doped semiconductor and P-type doped semiconductor. In some embodiments, a light emitting layer may be sandwiched between the N-type doped semiconductor and the P-type doped semiconductor, and the light emitting layer may have a Quantum Well (QW), for example: a Single Quantum Well (SQW), a Multiple Quantum Well (MQW), or other quantum well, holes provided by the P-type doped semiconductor layer and electrons provided by the N-type doped semiconductor layer can combine in the light-emitting layer and release energy in the form of light.
The light reflecting structure 120 includes a plurality of repeating units RU. In the present embodiment, each repeating unit RU is a quadrangle, for example, a diamond shape or a square shape inclined at an angle of 45 degrees. In other words, the four corners of each repeating unit RU may not be right angles, or may be both right angles. The repeating units RU are arrayed in the lateral direction HD and the longitudinal direction VD of the display device 1. In some embodiments, the length RL of each side of the repeating unit RU is 50 to 300 micrometers. In some embodiments, each side of the repeating unit RU is equal in length.
The light reflecting structure 120 includes a first wall portion B1 and a second wall portion B2. The first and second barrier wall portions B1 and B2 include, for example, a photoresist material. In some embodiments, the first and second barrier portions B1 and B2 comprise the same photoresist material, and the method for manufacturing the light reflecting structure 120 comprises a Half-tone (Half-tone) photomask process or a gray-tone (gray-tone) photomask process, but the invention is not limited thereto. In some embodiments, the first and second barrier portions B1 and B2 include the same or different photoresist materials, and the method of manufacturing the light reflecting structure 120 includes a plurality of photolithography processes.
A distance X1 between the top surface B1t of the first barrier portion B1 and the base 100 is greater than a distance X2 between the top surface B2t of the second barrier portion B2 and the base 100. For example, the bottom surface of the first wall portion B1 and the bottom surface of the second wall portion B2 are located on the same plane (the upper surface of the active device layer 110), and the thickness T1 of the first wall portion B1 is greater than the thickness T2 of the second wall portion B2. Note that, in fig. 2A to 2C, a clear boundary line is shown between the first wall portion B1 and the second wall portion B2, however, when the first wall portion B1 and the second wall portion B2 include the same photoresist material, the boundary line between the first wall portion B1 and the second wall portion B2 in the actual device may not be clear, or even may not be clear between the first wall portion B1 and the second wall portion B2. In the present embodiment, a portion of the light reflecting structure 120, which is located around the display unit DU and has a high level of the top surface, is defined as the first barrier portion B1, and a portion of the light reflecting structure 120, which is located around the display unit DU and has a low level of the top surface, is defined as the second barrier portion B2.
In some embodiments, porous (or air-containing) silicon oxide (SiO) is contained in the first and second barrier portions B1 and B22) Titanium oxide (TiO)2) Alumina (Al)2O3) Calcium carbonate (CaCO)3) Barium sulfate (BaSO)4) Zirconium oxide (ZrO)2) The present invention is not limited to the metal-coated polymer particles, hollow polymer particles, or other light-reflecting microstructures. In other embodiments, the first barrier wall portion B1 includes a transparent photoresist material and a reflective layer (not shown) disposed on a surface thereof, and the second barrier wall portion B2 includes a transparent photoresist material and a reflective layer (not shown) disposed on a surface thereof. In some embodiments, the reflectivity of the first barrier portion B1 is greater than or equal to the reflectivity of the second barrier portion B2.
In the present embodiment, each repeating unit RU includes the second barrier portion B2 located at the periphery and the first barrier portion B1 extending from the periphery into the center. In the present embodiment, the first barrier portions B1 in each repeating unit RU are cross-shaped, and the second barrier portions B2 connect the four end points of the first barrier portions B1 and define four opening regions O. In the present embodiment, each repeating unit RU has four opening regions O, a first sidewall S1 of each opening region O is defined by a first barrier portion B1, a second sidewall S2 of each opening region O is defined by a second barrier portion B2, and a third sidewall S3 of each opening region O is defined by a first barrier portion B1. In the present embodiment, the first side wall S1, the second side wall S2, and the third side wall S3 of each opening area O constitute a triangle, and each repeating unit RU includes four triangular opening areas O.
In the present embodiment, an included angle θ 1 between the first side wall S1 and the second side wall S2 is smaller than 90 degrees, and an included angle θ 2 between the third side wall S3 and the second side wall S2 is smaller than 90 degrees. In some embodiments, the included angle θ 1 and the included angle θ 2 are 30 degrees to 60 degrees. In some embodiments, the included angle θ 1 is equal to the included angle θ 2, and the opening area O is an isosceles triangle. In some embodiments, the included angle θ 3 between the first sidewall S1 and the third sidewall S3 is 90 degrees.
Each opening area O is provided with a corresponding one of the display units DU. In this embodiment, the light L emitted from the display unit DU in each opening area O may be red light, green light, blue light, or a combination thereof. In the present embodiment, the four display units DU in each repeating unit RU are separated by the first barrier portion B1, and the display unit DU in each repeating unit RU is separated from the display units DU in the adjacent other repeating units RU by the second barrier portion B2.
In some embodiments, the display unit DU is disposed near the first barrier portion B1, thereby better controlling the direction of the light L emitted from the display unit DU. For example, each display unit DU includes a plurality of light emitting elements (red light emitting element ED1, green light emitting element ED2, and blue light emitting element ED3), and the distance Z between the light emitting elements (red light emitting element ED1, green light emitting element ED2, and blue light emitting element ED3) and the first partition B1 is smaller than half the width W of each light emitting element (red light emitting element ED1, green light emitting element ED2, and blue light emitting element ED 3). For example, the width W of each light emitting element is 5 to 30 micrometers, and the pitch Z is 2.5 to 15 micrometers. The foregoing width W represents the maximum width of each light emitting element, and the maximum width is not limited to be parallel to the transverse direction HD or the longitudinal direction VD.
In this embodiment, since human eyes have a higher sensitivity to green, in each opening region O, the green light emitting element ED2 is closer to the included angle θ 3 between the first side wall S1 and the third side wall S3 than the red light emitting element ED1 and the blue light emitting element ED3, so that the light emitting direction of the green light emitting element ED2 can be better controlled, and the picture quality can be further improved.
In the present embodiment, the encapsulant 130 fills the opening region O and encapsulates the red light emitting element ED1, the green light emitting element ED2, and the blue light emitting element ED 3. The encapsulation adhesive 130 is a transparent encapsulation material, such as epoxy (epoxy), Silicone (Silicone), Acrylate (Acrylate), and Siloxane (Siloxane), or other materials. In some embodiments, the surface shape of the package adhesive 130 filled in the opening region O can be modulated to obtain the effect similar to a lens, thereby increasing the light emitting efficiency and further improving the brightness of the display screen.
Fig. 3 is a partially enlarged schematic view of a display area of a display device in a first three-dimensional display mode according to an embodiment of the invention. It should be noted that the embodiment of fig. 3 follows the element numbers and part of the contents of the embodiments of fig. 1 and fig. 2A to 2C, wherein the same or similar elements are denoted by the same or similar reference numbers, and the description of the same technical contents is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, which are not repeated herein.
Referring to fig. 1 and 3, in the first three-dimensional display mode of the display device 1, four adjacent display units DU in each repeating unit RU constitute one three-dimensional image pixel 3 DPX. Specifically, the four adjacent display units DU are four pixel units 3DSP1, 3DSP2, 3DSP3, 3DSP4 in the single three-dimensional image pixel 3DPX, respectively. In the present embodiment, since the distance between the top surface of the first barrier portion B1 and the substrate is greater than the distance between the top surface of the second barrier portion B2 and the substrate, the pixel units 3DSP1, 3DSP2, 3DSP3, and 3DSP4 emit light in different directions L1, L2, L3, and L4, respectively. In the present embodiment, the pixel units 3DSP1, 3DSP2, 3DSP3, 3DSP4 respectively provide three-dimensional display information of different viewing angles. In other words, one three-dimensional image pixel 3DPX includes three-dimensional display information of four different viewing angles, thereby obtaining a preferable three-dimensional display picture.
Fig. 4 is a partially enlarged schematic view of a display area of a display device in a second three-dimensional display mode according to an embodiment of the invention. It should be noted that the embodiment of fig. 4 follows the element numbers and part of the contents of the embodiments of fig. 1 and fig. 2A to 2C, wherein the same or similar elements are denoted by the same or similar reference numbers, and the description of the same technical contents is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, which are not repeated herein.
Referring to fig. 1 and 4, in the second three-dimensional display mode of the display device 1, four adjacent display units DU in each repeating unit RU constitute one three-dimensional image pixel 3 DPX. Specifically, in the single repeating unit RU, two adjacent display units DU constitute one pixel unit 3DSP1, and the other two adjacent display units DU constitute the other pixel unit 3DSP 2. The pixel unit 3DSP1 and the pixel unit 3DSP2 constitute one three-dimensional image pixel 3 DPX. In the present embodiment, the pixel unit 3DSP1 can be regarded as emitting light in the direction L12, and the pixel unit 3DSP2 can be regarded as emitting light in the direction L34.
In the present embodiment, the two display units DU in the pixel unit 3DSP1 provide three-dimensional display information of one viewing angle, and the two display units DU in the pixel unit 3DSP2 provide three-dimensional display information of the other viewing angle. In other words, in the present embodiment, one three-dimensional image pixel 3DPX includes display information of two different viewing angles, thereby obtaining a three-dimensional display picture.
The second three-dimensional display mode of fig. 4 requires only less three-dimensional display information (one three-dimensional image pixel 3DPX changes from display information including four different viewing angles to display information including two different viewing angles) compared to the first three-dimensional display mode shown in fig. 3. In addition, in the second three-dimensional display mode of fig. 4, the single-view pixel unit in the three-dimensional image pixel 3DPX includes two display units DU, and thus the luminance of the single-view pixel unit is large.
Fig. 5 is a partially enlarged schematic view of a display area of a display device in a two-dimensional display mode according to an embodiment of the invention. It should be noted that the embodiment of fig. 5 follows the element numbers and part of the contents of the embodiments of fig. 1 and fig. 2A to 2C, wherein the same or similar elements are denoted by the same or similar reference numbers, and the description of the same technical contents is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, which are not repeated herein.
Referring to fig. 1 and 5, in the two-dimensional display mode of the display apparatus 1, every two adjacent display units DU form a two-dimensional image pixel 2 DPX. Two adjacent display units DU in each two-dimensional image pixel 2DPX are separated by the second barrier portion B2. In other words, the adjacent two display units DU positioned on both sides of the second barrier portion B2 constitute one two-dimensional image pixel 2 DPX. In the present embodiment, each repeating unit RU includes four half two-dimensional image pixels 2 DPX.
In the present embodiment, the directions of the light rays emitted from two adjacent display units DU in one two-dimensional image pixel 2DPX are symmetrical to each other, so that the two-dimensional image pixels with the full viewing angle can be formed together by complementing each other.
In the two-dimensional display mode of fig. 5, one two-dimensional image pixel 2DPX includes two adjacent display units DU. In other words, the two-dimensional display mode may have a greater resolution than the three-dimensional display mode of fig. 3 or 4. Specifically, the resolution of the two-dimensional display mode is twice the resolution of the three-dimensional display mode.
Based on the above, through the arrangement of the light reflecting structure 120, the display unit DU of the display device 1 can emit light rays with different angles, thereby obtaining a two-dimensional display picture or a three-dimensional display picture. In addition, pixel units with different viewing angles can be obtained without additionally arranging other structures (such as a parallax barrier) for generating parallax, so that the resolution and the brightness of the display device 1 are improved.
Fig. 6 is a schematic cross-sectional view of a display device according to an embodiment of the invention. It should be noted that the embodiment of fig. 6 follows the element numbers and part of the contents of the embodiments of fig. 1 and fig. 2A to 2C, wherein the same or similar elements are denoted by the same or similar reference numbers, and the description of the same technical contents is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, which are not repeated herein.
The main differences between the display device 2 of fig. 6 and the display device 1 of fig. 2A to 2C are: in the display device 1 of fig. 2A to 2C, the side SW1 of the first retaining wall B1 and the side SW2 of the second retaining wall B2 are perpendicular to the upper surface 110t of the active device layer 110; in the display device 2 of fig. 6, the side SW1 of the first wall B1 and the side SW2 of the second wall B2 are not perpendicular to the upper surface 110t of the active device layer 110.
In this embodiment, an internal angle α between the side surface SW1 of the first wall B1 and the upper surface 110t of the active device layer 110 is greater than 90 degrees, so that the first wall B1 has a structure with a wide top and a narrow bottom. In the present embodiment, the inner angle β between the side SW2 of the second barrier B2 and the upper surface 110t of the active device layer 110 is greater than 90 degrees, so that the second barrier B2 has a structure with a wide top and a narrow bottom. The direction of the light L emitted from the display unit DU is adjusted by such a design. For example, the direction of the light L is further deviated from the normal direction of the display device 2.
Based on the above, through the arrangement of the light reflecting structure 120, the display unit DU of the display device 2 can emit light rays with different angles, thereby obtaining a two-dimensional display picture or a three-dimensional display picture. In addition, pixel units with different viewing angles can be obtained without additionally arranging other structures (such as a parallax barrier) for generating parallax, so that the resolution and the brightness of the display device 2 are improved.
Fig. 7 is a schematic cross-sectional view of a display device according to an embodiment of the invention. It should be noted that the embodiment of fig. 7 follows the element numbers and part of the contents of the embodiments of fig. 1 and fig. 2A to 2C, wherein the same or similar elements are denoted by the same or similar reference numbers, and the description of the same technical contents is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, which are not repeated herein.
The main differences between the display device 3 of fig. 7 and the display device 1 of fig. 2A to 2C are: in the display device 1 of fig. 2A to 2C, the side SW1 of the first retaining wall B1 and the side SW2 of the second retaining wall B2 are perpendicular to the upper surface 110t of the active device layer 110; in the display device 3 of fig. 7, the side SW1 of the first wall B1 and the side SW2 of the second wall B2 are not perpendicular to the upper surface 110t of the active device layer 110.
In this embodiment, an inner angle α between the side surface SW1 of the first wall B1 and the upper surface 110t of the active device layer 110 is smaller than 90 degrees, so that the first wall B1 has a structure with a narrow top and a wide bottom. In the embodiment, the inner angle β between the side SW2 of the second barrier B2 and the upper surface 110t of the active device layer 110 is smaller than 90 degrees, so that the second barrier B2 has a structure with a narrow top and a wide bottom. The direction of the light L emitted from the display unit DU is adjusted by such a design. For example, the direction of the light L is closer to the normal direction of the display device 3.
Based on the above, through the arrangement of the light reflecting structure 120, the display unit DU of the display device 3 can emit light rays with different angles, thereby obtaining a two-dimensional display picture or a three-dimensional display picture. In addition, pixel units with different viewing angles can be obtained without additionally arranging other structures (such as a parallax barrier) for generating parallax, thereby improving the resolution and the brightness of the display device 3.
Fig. 8A is a partially enlarged schematic view of a display area of a display device in a three-dimensional display mode according to an embodiment of the invention. Fig. 8B is a schematic sectional view along the line c-c' of fig. 8A. Fig. 8C is a schematic sectional view taken along line d-d' of fig. 8A. It should be noted that the embodiment of fig. 8A to 8C follows the element numbers and part of the contents of the embodiment of fig. 1 and 2A to 2C, wherein the same or similar elements are denoted by the same or similar reference numbers, and the description of the same technical contents is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, which are not repeated herein.
Referring to fig. 8A to 8C, in the present embodiment, each repeating unit RU is rectangular or square, and two sides of the repeating unit RU are parallel to the transverse direction HD of the display device 4, and the other two sides are parallel to the longitudinal direction VD of the display device 4.
In this embodiment, each repeating unit RU includes at least one platform structure PF. The land structure PF is disposed in two opening areas O arranged in the first direction (the lateral direction HD), and is not disposed in the other two opening areas O arranged in the second direction (the longitudinal direction VD). The first direction (transverse direction HD) is perpendicular to the second direction (longitudinal direction VD).
In the present embodiment, a distance X3 between the top surface PFt of the platform structure PF and the substrate 100 is smaller than a distance X1 between the top surface B1t of the first partition wall portion B1 and the substrate 100. The distance X3 between the top surface PFt of the platform structure PF and the substrate 100 is equal to or not equal to the distance X2 between the top surface B2t of the second barrier B2 and the substrate 100. In the present embodiment, the thickness T3 of the platform structure PF is the same as the thickness T2 of the second barrier B2.
In some embodiments, a layer of photoresist material is formed first, and then a photolithography process is performed on the layer of photoresist material to form the mesa structure PF and the second barrier wall B2; another photoresist material layer is formed, and then another photolithography process is performed on the another photoresist material layer to form the first retaining walls B1, which is not limited in the invention. In other embodiments, a layer of photoresist material is formed, and then a photolithography process is performed on the layer of photoresist material using a halftone photomask or a gray-scale photomask to form the mesa structure PF, the first retaining wall B1, and the second retaining wall B2. Note that, in fig. 8A to 8C, a clear boundary line is shown between the first barrier wall portion B1 and the mesa structure PF, however, when the first barrier wall portion B1 and the mesa structure PF include the same photoresist material, the boundary line between the first barrier wall portion B1 and the mesa structure PF may not be clear, or even the boundary line between the first barrier wall portion B1 and the mesa structure PF may not be clear. In the present embodiment, a portion of the light reflecting structure 120, which is located in the opening region O and used for elevating the display unit DU, is defined as a platform structure PF.
In some embodiments, in the two opening areas O arranged in the first direction (the lateral direction HD), the green light emitting element ED2 of the display unit DU is disposed on the platform structure PF, and the red light emitting element ED1 and the blue light emitting element ED3 are selectively disposed on the platform structure PF or not disposed on the platform structure PF. In some embodiments, a portion of the bonding pads 118 is disposed on the platform structure PF, and another portion of the bonding pads 118 is not disposed on the platform structure PF.
By setting the platform structure PF, the actual viewing angle of the display device 4 in the up-down (longitudinal VD) direction can be made smaller than the viewing angle in the left-right (lateral HD) direction. In other words, the height of the display unit DU is adjusted by the design of the light reflecting structure 120, so that the vertical 3D viewing angle of the three-dimensional image pixel 3DPX is smaller than the horizontal 3D viewing angle, thereby improving the stereoscopic effect of the image. In this embodiment, the display device 4 may include a first three-dimensional display mode and a second three-dimensional display mode, in other words, in this embodiment, the three-dimensional image pixel 3DPX may include pixel units of four different viewing angles, and may also include pixel units of two different viewing angles.
In this embodiment, because human eyes have a higher sensitivity to green, the green light emitting device ED2 is disposed on the platform structure PF in the two opening areas O arranged in the first direction (horizontal HD), so as to better control the light emitting direction of the green light emitting device ED2, and further improve the picture quality.
Fig. 9 is a partially enlarged schematic view of a display area of a display device in a two-dimensional display mode according to an embodiment of the invention. It should be noted that the embodiment of fig. 9 follows the element numbers and partial contents of the embodiment of fig. 8A to 8C, wherein the same or similar elements are denoted by the same or similar reference numbers, and the description of the same technical contents is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, which are not repeated herein.
Referring to fig. 9, the display device 4 is switched to the two-dimensional display mode, and the display device 4 includes two-dimensional image pixels 2DHPX symmetrical in the lateral direction HD and two-dimensional image pixels 2DVPX symmetrical in the longitudinal direction VD.
The total number of the two-dimensional image pixels 2DHPX and the two-dimensional image pixels 2DVPX is greater than the total number of the three-dimensional image pixels 3DPX of fig. 8A, in other words, in the present embodiment, the two-dimensional display mode of the display device 4 also has an advantage of improving the resolution.
Based on the above, through the arrangement of the light reflecting structure 120, the display unit DU of the display device 4 can emit light rays with different angles, thereby obtaining a two-dimensional display picture or a three-dimensional display picture. In addition, pixel units with different viewing angles can be obtained without additionally arranging other structures (such as a parallax barrier) for generating parallax, so that the resolution and the brightness of the display device 4 are improved.

Claims (10)

1. A display device, comprising:
a substrate;
an active device layer on the substrate;
a plurality of display units located on the active device layer; and
a reflective structure located on the active device layer and including a plurality of repeating units, each of the repeating units having four opening regions, each of the opening regions being provided with a corresponding one of the display units, wherein the reflective structure includes a first wall portion and a second wall portion, a distance between a top surface of the first wall portion and the substrate is greater than a distance between a top surface of the second wall portion and the substrate, a first sidewall of each of the opening regions is defined by the first wall portion, a second sidewall of each of the opening regions is defined by the second wall portion, an included angle between the first sidewall and the second sidewall is less than 90 degrees, and wherein:
the display units in each repeating unit are separated by the first baffle wall part; and is
The plurality of display units in each of the repeating units are separated from the plurality of display units in the other adjacent repeating units by the second barrier portion.
2. The display device of claim 1, wherein the four adjacent display units in each of the repeating units constitute a three-dimensional image pixel.
3. The display device according to claim 1, wherein each two adjacent ones of the display units constitute a two-dimensional image pixel, wherein the two adjacent ones of the display units in each of the two-dimensional image pixels are separated by the second barrier portion.
4. The display device according to claim 1, wherein the first barrier portion in each of the repeating units has a cross shape or an X-shape.
5. The display device according to claim 1, wherein the side of the first dam is not perpendicular to the top surface of the active device layer.
6. The display device according to claim 1, wherein a third sidewall of each of the opening regions is defined by the first wall portion, wherein the first sidewall, the second sidewall and the third sidewall of each of the opening regions form a triangle.
7. The display apparatus according to claim 6, wherein each of the display units includes a red light emitting element, a green light emitting element and a blue light emitting element, and the green light emitting element is closer to an included angle between the first sidewall and the third sidewall than the red light emitting element and the blue light emitting element in each of the opening areas.
8. The display device according to claim 1, wherein each of the display units includes a plurality of light emitting elements, and a distance between the plurality of light emitting elements and the first dam portion is less than half of a width of each of the light emitting elements.
9. The display device according to claim 1, wherein each of the repeating units comprises at least one mesa structure, and wherein in each of the repeating units, the at least one mesa structure is disposed in two of the plurality of open areas arranged in a first direction and is not disposed in another two of the plurality of open areas arranged in a second direction, wherein the first direction is perpendicular to the second direction.
10. The display device according to claim 1, wherein a thickness of the first barrier portion is greater than a thickness of the second barrier portion.
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