Full-color display structure based on glass substrate and preparation method thereof

Abstract

The invention relates to the technical field of full-color display, in particular to a full-color display structure based on a glass substrate and a preparation method of the full-color display structure. The blind hole is formed in the glass substrate, the light-emitting module is located in the blind hole, and the interposer is located between the blind hole and the light-emitting module; the cathode is positioned on one side of the glass substrate and is connected with the N regions of all the light-emitting modules; the anode contacts are located on the other side of the glass substrate, and one anode contact is connected with the P area of one light-emitting module through a metal column at the bottom of the blind hole. The light-emitting module is embedded in the blind hole, protection of the core particles is increased, abrasion of the core particles is reduced, subsequent structure thinning is facilitated, the substrate can be smoother, and in addition, divergence of light can be reduced through the sunken blind hole.

Description

Technical Field

[0001] This invention relates to the field of full-color display technology, and in particular to a full-color display structure based on a glass substrate and its fabrication method. Background Technology

[0002] Transparent display technologies for automobiles (such as HUDs and hidden displays) can project key information such as navigation and vehicle speed directly onto the windshield or side windows, reducing driver distraction and risk. They can also be used to achieve innovative functions such as naked-eye 3D and gesture interaction.

[0003] Most existing transparent display structures use transparent glass as a substrate and integrate the light-emitting unit on one side of the glass substrate. This arrangement results in significant light diffusion, reduces the luminous efficiency of the display structure, and the light-emitting unit that protrudes from the substrate surface requires separate encapsulation for protection. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide a full-color display structure based on a glass substrate, which aims to solve at least one of the above problems.

[0005] To achieve the above objectives, the present invention provides a full-color display structure based on a glass substrate, the full-color display structure comprising: Transparent glass substrate; A blind via on a glass substrate, a light-emitting module inside the blind via, and an intermediary layer between the blind via and the light-emitting module; A cathode located on one side of the glass substrate is connected to the N-region of all light-emitting modules; The anode contact is located on the other side of the glass substrate. One anode contact is connected to the P-area of ​​a light-emitting module through a metal post at the bottom of a blind hole.

[0006] Furthermore, the cathode is a ring cathode, which includes an inner ring and an outer ring. The inner ring is connected to the N-region of all light-emitting modules, and the inner ring is connected to the outer ring through reinforcing ribs. The cathode metal is made of one or a combination of at least two of Cr, Al, Ti, Pt, Ag, and Au.

[0007] Furthermore, the light-emitting module includes: an R light-emitting unit, a G light-emitting unit, and a B light-emitting unit, as well as an insulating protective layer located outside the R light-emitting unit, the G light-emitting unit, and the B light-emitting unit.

[0008] Furthermore, the material of the interlayer is polyimide or polyamic acid.

[0009] To achieve the above objectives, the present invention provides a method for fabricating a full-color display structure based on a glass substrate, the method comprising: (1) Prepare a ring cathode and bond the light-emitting module to the cathode; (2) A blind hole is prepared on one side of the glass substrate, and the light-emitting module is placed in the blind hole. The P region of the light-emitting module is in contact with the bottom of the blind hole, and the N region of the light-emitting module is flush with the top of the blind hole. The annular cathode is connected to the glass substrate by contact bonding. Organic matter is filled in the blind hole to form an intermediate layer. (3) A through hole is prepared on the other side of the glass substrate, a metal pillar is formed in the through hole, and an anode contact is formed on the surface of the metal pillar.

[0010] Furthermore, when the P-region of the light-emitting module contacts the bottom of the blind hole and the N-region of the light-emitting module is flush with the top of the blind hole, the annular cathode contacts the glass substrate and is bonded to the glass.

[0011] Furthermore, before forming the metal pillar, the P-region of the light-emitting module is etched by laser ablation or dry etching to remove organic matter at the bottom of the P-region.

[0012] Furthermore, before forming the metal pillar, a thin metal layer is deposited on the sidewall of the via, and the material of the thin metal layer is Ti, Cr or TiW.

[0013] Furthermore, the metal pillar is made of copper.

[0014] Furthermore, the material of the anode contact is one or a combination of at least two of Cr, Al, Ti, Pt, Ag, and Au.

[0015] The full-color display structure based on a glass substrate provided by the present invention has the following beneficial technical effects: (1) The light-emitting module is buried in the blind hole, which can achieve isolation and protection of the core without additional encapsulation of the core, effectively reducing the wear of the core, facilitating subsequent structural thinning, and the substrate can be flatter. In addition, the light divergence can be reduced by the recessed blind hole; (2) The use of a ring cathode increases the contact area with the glass substrate, greatly improves the adhesion of the ring cathode on the glass substrate, and reduces the risk of cathode falling off. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a full-color display structure based on a glass substrate provided in an embodiment of the present invention; Figure 2 A flowchart illustrating the fabrication method of a full-color display structure based on a glass substrate provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a light-emitting module with a cathode provided in an embodiment of the present invention, wherein (a) is a top view, (b) is a bottom view, and (c) is a front view; Figure 4 A front view of a blind hole provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the blind hole structure of the buried light-emitting unit provided in an embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0019] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] Figure 1 This is a schematic diagram of a full-color display structure based on a glass substrate provided in an embodiment of the present invention. For ease of explanation, only the parts related to the embodiment of the present invention are shown. The structure includes: Transparent glass substrate; Blind vias on glass substrates, light-emitting modules within blind vias, and intermediary layers between blind vias and light-emitting modules; A cathode located on one side of the glass substrate is connected to the N-region of all light-emitting modules; The anode contact is located on the other side of the glass substrate. One anode contact is connected to the P-area of ​​a light-emitting module through a metal post at the bottom of a blind hole.

[0021] In this embodiment of the invention, the light-emitting module includes: an R light-emitting unit, a G light-emitting unit, and a B light-emitting unit, as well as an insulating protective layer on the outside of the R, G, and B light-emitting units. The R light-emitting unit emits red light, the G light-emitting unit emits green light, and the B light-emitting unit emits blue light. The R, G, and B light-emitting units are PN junction diodes, each including a P-region and an N-region. The R, G, and B light-emitting units are all cylindrical, with a diameter of 5µm to 50µm and a height of 2µm to 7µm. The insulating protective layer is made of silicon oxide (SiO2), titanium oxide (TiO2), tantalum oxide (Ta2O5), or hafnium oxide (HfO2) to achieve insulation isolation between different devices and prevent crosstalk between the light-emitting colors of different diodes.

[0022] The cathode in this invention adopts a ring structure, referred to as a ring cathode. The N-region of all light-emitting modules is connected to this ring cathode. The ring cathode realizes the common cathode connection of the RGB three-color light-emitting modules. Only a positive voltage needs to be applied to the sample anode contact to drive the light-emitting module to emit light. In order to make the structure of the cathode coil more stable, the ring cathode includes an inner ring and an outer ring. The inner ring is connected to the N-region of all light-emitting modules and is connected to the outer ring through reinforcing ribs. The double-ring structure makes the cathode structure more stable and increases the contact area with the glass substrate, which greatly improves the adhesion of the ring cathode to the glass substrate and reduces the risk of cathode detachment. The material of the ring cathode is one or a combination of at least two of Cr, Al, Ti, Pt, Au, and Ag.

[0023] The full-color display structure based on a glass substrate provided by the present invention has the following beneficial technical effects: (1) The light-emitting module is buried in a blind hole, which reduces the wear of the core particles, facilitates the subsequent thinning of the structure, and the substrate can be flatter. In addition, the light divergence can be reduced by the recessed blind hole; (2) The use of a ring cathode increases the contact area with the glass substrate, greatly improves the adhesion of the ring cathode on the glass substrate, and reduces the risk of cathode falling off.

[0024] Figure 2 This is a flowchart illustrating a method for fabricating a full-color display structure based on a glass substrate, as provided in an embodiment of the present invention. The method is as follows: (1) Prepare the cathode, and prepare the light-emitting module on the cathode, forming a structure as shown in Figure 1. Figure 3 As shown, (a) is the top view, (b) is the bottom view, and (c) is the front view; The cathode in this invention adopts a ring-shaped structure. The N-region and P-region of the light-emitting module are sequentially fabricated on the ring-shaped cathode. The ring-shaped cathode realizes the common cathode connection of the RGB three-color light-emitting modules. The ring-shaped cathode includes an inner ring and an outer ring. The inner ring is connected to the N-region of all light-emitting modules and is connected to the outer ring through reinforcing ribs. The double-layer ring structure makes the cathode structure more stable and increases the contact area with the glass substrate, which greatly improves the adhesion of the ring-shaped cathode to the glass substrate and reduces the risk of cathode detachment. The material of the ring-shaped cathode is one or a combination of at least two of Cr, Al, Ti, Pt, Au, and Ag.

[0025] (2) A blind hole is prepared on one side of the glass substrate, and the light-emitting module is placed in the blind hole. The P region of the light-emitting module is in contact with the bottom of the blind hole, and the N region of the light-emitting module is flush with the top of the blind hole. The annular cathode is connected to the glass substrate by contact bonding. Organic matter is filled in the blind hole to form an intermediate layer. The glass substrate is made of borosilicate glass or quartz glass, which have strong mechanical stability, adjustable coefficient of thermal expansion, high resistivity and low cost. At the same time, the glass is transparent, making it easy to observe the overall structure.

[0026] First, a frustum-shaped blind via with a top diameter of approximately 200 μm, a bottom diameter of approximately 180 μm, and a height of approximately 10 μm is fabricated on one side of the glass substrate. The blind via structure is as follows: Figure 4 As shown, methods for fabricating blind vias include: sandblasting, ultrasonic drilling, focused discharge machining, plasma etching, laser ablation, electrochemical discharge machining, photosensitive glass method, or laser-induced etching. The fabricated light-emitting module is embedded in the blind via. The P-region of the light-emitting module contacts the bottom of the blind via, the N-region of the light-emitting module is flush with the top of the blind via, the annular cathode contacts the glass substrate, and the annular cathode is bonded to the glass. Finally, the blind via is filled with organic materials such as polyimide (PI) and polyamic acid to form an interlayer, which reduces internal thermal stress and isolates other substances, forming a structure like... Figure 5 The structure shown.

[0027] (3) A through hole is prepared on the other side of the glass substrate, a metal pillar is formed in the through hole, and an anode contact is formed on the surface of the metal pillar.

[0028] A frustum-shaped through-hole is fabricated on the other side of the glass substrate using a blind via fabrication method. The diameter of the frustum-shaped through-hole closer to the light-emitting module is smaller than the diameter farther away from the light-emitting module. Since the P-area of ​​the light-emitting module or the bottom of the blind via may not be flat, there may be gaps between the P-area of ​​the light-emitting module and the bottom of the blind via. When organic matter is filled, the gaps are also filled with non-conductive organic matter. The P-area of ​​the light-emitting module is etched by laser ablation or dry etching to remove the organic matter that may be filled due to unevenness.

[0029] A metal thin film is deposited on the sidewall of the via using methods such as physical vapor deposition (PVD) or chemical plating to increase the adhesion between the metal pillar and the glass substrate. The material of the metal thin film is Ti, Cr, or TiW, etc. Then, a metal pillar is formed in the via, and finally, the via is filled with the corresponding metal by electroplating. The material of the metal pillar is Cu.

[0030] In this embodiment of the invention, an anode contact is formed on the side of the metal pillar away from the cathode. Each metal pillar corresponds to one anode contact. The anode contact is a cylinder with a diameter of about 50 μm. The material of the anode contact is one or a combination of at least two of Cr, Al, Ti, Pt, Ag, and Au. Applying a positive voltage to the anode contact can drive the light-emitting unit to emit light. Applying a positive voltage to the anode contact of the corresponding color can control the light-emitting unit of the corresponding color to emit light.

[0031] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A full-color display structure based on a glass substrate, characterized in that, The full-color display structure includes: Transparent glass substrate; A blind via on a glass substrate, a light-emitting module inside the blind via, and an intermediary layer between the blind via and the light-emitting module; A cathode located on one side of the glass substrate is connected to the N-region of all light-emitting modules; The anode contact is located on the other side of the glass substrate. One anode contact is connected to the P-area of ​​a light-emitting module through a metal post at the bottom of a blind hole.

2. The full-color display structure based on a glass substrate according to claim 1, characterized in that, The cathode is a ring cathode, which includes an inner ring and an outer ring. The inner ring is connected to the N-region of all light-emitting modules. The inner ring is connected to the outer ring through reinforcing ribs. The cathode metal is made of one or a combination of at least two of Cr, Al, Ti, Pt, Ag, and Au.

3. The full-color display structure based on a glass substrate according to claim 1, characterized in that, The light-emitting module includes: an R light-emitting unit, a G light-emitting unit, and a B light-emitting unit, as well as an insulating protective layer located outside the R light-emitting unit, the G light-emitting unit, and the B light-emitting unit.

4. The full-color display structure based on a glass substrate according to claim 1, characterized in that, The intermediate layer is made of polyimide or polyamic acid.

5. The method for fabricating a full-color display structure based on a glass substrate according to any one of claims 1-4, characterized in that, The preparation method includes: (1) Prepare the cathode and bond the light-emitting module to the cathode; (2) A blind hole is prepared on one side of the glass substrate, and the light-emitting module is placed in the blind hole. The P region of the light-emitting module is in contact with the bottom of the blind hole, and the N region of the light-emitting module is flush with the top of the blind hole. The cathode is connected to the glass substrate by contact bonding. Organic matter is filled in the blind hole to form an intermediate layer. (3) A through hole is prepared on the other side of the glass substrate, a metal pillar is formed in the through hole, and an anode contact is formed on the surface of the metal pillar.

6. The method for fabricating a full-color display structure based on a glass substrate according to claim 5, characterized in that, When the P-region of the light-emitting module contacts the bottom of the blind hole and the N-region of the light-emitting module is flush with the top of the blind hole, the annular cathode contacts the glass substrate and is bonded to the glass.

7. The method for fabricating a full-color display structure based on a glass substrate according to claim 5, characterized in that, Before forming the metal pillar, the P-region of the light-emitting module is etched by laser ablation or dry etching to remove organic matter at the bottom of the P-region.

8. The method for fabricating a full-color display structure based on a glass substrate according to claim 5, characterized in that, Before forming the metal pillar, a thin metal layer is deposited on the sidewall of the via. The material of the thin metal layer is Ti, Cr or TiW.

9. The method for fabricating a full-color display structure based on a glass substrate according to claim 5, characterized in that, The metal pillar is made of copper.

10. The method for fabricating a full-color display structure based on a glass substrate according to claim 5, characterized in that, The anode contact material is one or a combination of at least two of Cr, Al, Ti, Pt, Ag, and Au.

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