WO2020173465A1 - Mems器件及其制作方法、显示基板 - Google Patents
Mems器件及其制作方法、显示基板 Download PDFInfo
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- WO2020173465A1 WO2020173465A1 PCT/CN2020/076810 CN2020076810W WO2020173465A1 WO 2020173465 A1 WO2020173465 A1 WO 2020173465A1 CN 2020076810 W CN2020076810 W CN 2020076810W WO 2020173465 A1 WO2020173465 A1 WO 2020173465A1
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- glass substrate
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- sacrificial layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B3/00—Devices comprising flexible or deformable elements, e.g. comprising elastic tongues or membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C1/00—Manufacture or treatment of devices or systems in or on a substrate
Definitions
- the present disclosure relates to the technical field of MEMS devices, and in particular to a MEMS device, a manufacturing method thereof, and a display substrate. Background technique
- Micro-Electro-Mechanical System (MEMS) devices are mainly based on Shigui wafers. Due to the small size of the silicon wafer substrates (mainly 6 inches and 8 inches), it is difficult to produce large array MEMS devices. . At the same time, due to the small size of the silicon wafer substrate, the manufacturing cost of the MEMS device will be high. Summary of the invention
- the present disclosure provides a MEMS device, including:
- a glass substrate a MEMS element located on the glass substrate, the MEMS element including a diaphragm layer and a cavity for providing a vibration space for the diaphragm layer.
- the MEMS element is a capacitive MEMS element, and the MEMS element includes: a first electrode pattern on the glass substrate;
- a protective layer located on the side of the second electrode pattern away from the glass substrate
- a connection hole penetrates the protective layer and exposes a part of the second connection hole of the second electrode.
- the orthographic projection of the corrosion hole on the glass substrate is located outside of the orthographic projection of the cavity on the glass substrate.
- the MEMS element is a piezoelectric MEMS element, and the MEMS element includes: a support layer pattern on the glass substrate;
- the piezoelectric material layer pattern located on the side of the first electrode pattern away from the glass substrate;
- a second electrode pattern located on the side of the piezoelectric material layer pattern away from the glass substrate;
- a protective layer located on the side of the second electrode pattern away from the glass substrate
- the orthographic projection of the piezoelectric material layer pattern on the glass substrate and the orthographic projection of the cavity on the glass substrate at least partially overlap.
- the MEMS element is a piezoresistive MEMS element, and the MEMS element includes: a support layer pattern on the glass substrate;
- the protective layer located on the side of the piezoresistive material layer pattern and the conductive line pattern away from the glass substrate; penetrates the protective layer and exposes the connection hole of the conductive line.
- the orthographic projection of the corrosion hole on the glass substrate is located outside of the orthographic projection of the cavity on the glass substrate, and the orthographic projection of the piezoresistive material layer pattern on the glass substrate and the orthographic projection on the glass substrate The orthographic projections of the cavities on the glass substrate partially overlap.
- the size of the glass substrate is greater than or equal to a preset size.
- the preset size is 370mm X 470mm.
- the present disclosure also provides a manufacturing method of a MEMS device, including:
- a MEMS element is formed on the glass substrate, and the MEMS element includes a diaphragm layer and a cavity for providing a vibration space for the diaphragm layer.
- forming a MEMS element on the glass substrate includes:
- the sacrificial layer pattern is removed through the etching hole to form the cavity.
- the method includes:
- a diaphragm layer is formed on the sacrificial layer pattern and the support layer pattern, and the diaphragm layer is patterned to form an etching hole, which penetrates the diaphragm layer and is connected to the sacrificial layer pattern ; as well as
- the sacrificial layer pattern is removed through the etching hole to form the cavity.
- the method includes:
- a diaphragm layer is formed on the sacrificial layer pattern and the support layer pattern, and the diaphragm layer is patterned to form an etching hole, which penetrates the diaphragm layer and is connected to the sacrificial layer pattern ; as well as
- the sacrificial layer pattern is removed through the etching hole to form the cavity.
- the sacrificial layer pattern is removed by dry or wet etching.
- the size of the glass substrate is greater than or equal to a preset size.
- the preset size is 370mm X 470mm.
- the step of removing the pattern of the sacrificial layer through the etching hole and forming the cavity further includes:
- a filling pattern for filling the etching hole is formed.
- the MEMS element is a capacitive MEMS element
- the forming the MEMS element on the glass substrate includes:
- a supporting layer is formed on the pattern of the sacrificial layer and the supporting layer is patterned to form a pattern of the supporting layer, the pattern of the supporting layer does not cover the pattern of the sacrificial layer or covers a part of the sacrificial layer Graphics
- a diaphragm layer is formed on the pattern of the sacrificial layer and the pattern of the support layer, and the diaphragm layer is patterned to form corrosion holes.
- the corrosion holes penetrate the diaphragm layer and expose part of the diaphragm layer.
- a first connection hole that penetrates the protective layer, the diaphragm layer and the support layer and exposes a part of the first electrode is formed, and a second connection hole that penetrates the protective layer and exposes a part of the second electrode is formed Connection hole.
- the MEMS element is a piezoelectric MEMS element
- the forming the MEMS element on the glass substrate includes:
- a support layer is formed on the pattern of the sacrificial layer and the support layer is patterned to form a pattern of the support layer, and the pattern of the support layer does not cover the pattern or cover part of the sacrificial layer Graphics of the sacrificial layer;
- a diaphragm layer is formed on the pattern of the sacrificial layer and the pattern of the support layer, and the diaphragm layer is patterned to form corrosion holes.
- the corrosion holes penetrate the diaphragm layer and expose part of the diaphragm layer.
- a first connection hole penetrating the protective layer and exposing part of the first electrode is formed, and a second connection hole penetrating the protective layer and exposing a part of the second electrode is formed.
- the MEMS element is a piezoresistive MEMS element
- the forming the MEMS element on the glass substrate includes:
- a supporting layer is formed on the pattern of the sacrificial layer and the supporting layer is patterned to form a pattern of the supporting layer, the pattern of the supporting layer does not cover the pattern of the sacrificial layer or covers a part of the sacrificial layer Graphics
- a diaphragm layer is formed on the pattern of the sacrificial layer and the pattern of the support layer, and the diaphragm layer is patterned to form corrosion holes.
- the corrosion holes penetrate the diaphragm layer and expose part of the diaphragm layer.
- a connection hole is formed that penetrates the protective layer and exposes a part of the conductive line.
- the embodiments of the present disclosure also provide a MEMS device, including:
- the MEMS element located on the glass substrate includes a diaphragm layer and a cavity for providing a vibration space for the diaphragm layer.
- the size of the glass substrate is greater than or equal to a preset size.
- the preset size is 370mm X 470mm.
- the MEMS element is a capacitive MEMS element, and the MEMS element includes: a first electrode pattern on the glass substrate;
- the pattern of the support layer located on the side of the first electrode away from the glass substrate;
- the first connection hole of the first electrode is penetrated through the protective layer, the diaphragm layer and the support layer, and a part of the second connection hole of the second electrode is penetrated through the protective layer.
- the MEMS element is a piezoelectric MEMS element, and the MEMS element includes: a pattern of a support layer on the glass substrate;
- a first electrode pattern located on the side of the diaphragm layer away from the glass substrate;
- the pattern of the piezoelectric material layer located on the side of the first electrode pattern away from the glass substrate;
- a protective layer located on the side of the second electrode pattern away from the glass substrate
- the MEMS element is a piezoresistive MEMS element, and the MEMS element includes: a pattern of a support layer on the glass substrate;
- the pattern of the piezoresistive material layer and the pattern of the conductive line located on the side of the diaphragm layer away from the glass substrate, and the piezoresistive material layer is connected to the conductive line;
- the pattern of the piezoresistive material layer and the pattern of the conductive line are away from the protective layer on the side of the glass substrate; the connecting hole of the conductive line is exposed through the protective layer.
- the present disclosure also provides a display substrate, including the above-mentioned MEMS device, a pixel unit array, and a display control circuit. Description of the drawings
- FIG. 1 is a schematic flowchart of a manufacturing method of a MEMS device according to an embodiment of the disclosure
- FIG. 2A is a schematic flow diagram of a method for forming a MEMS element on a glass substrate according to an embodiment of the disclosure
- 2B is a schematic flow chart of a method for forming a MEMS element on a glass substrate according to another embodiment of the present disclosure
- 3A-3I are schematic flowcharts of a manufacturing method of a capacitive MEMS device according to an embodiment of the disclosure.
- FIG. 3J is a schematic structural diagram of a capacitive MEMS device according to another embodiment of the disclosure.
- Fig. 3K is a schematic structural diagram of a capacitive MEMS device according to another embodiment of the disclosure
- Figs. 4A-4K are schematic flowcharts of a manufacturing method of a piezoelectric MEMS device according to an embodiment of the disclosure
- 5A-5H are schematic flow diagrams of a manufacturing method of a piezoresistive MEMS device according to an embodiment of the disclosure Figure
- FIG. 51 is a schematic plan view of a piezoresistive MEMS device according to an embodiment of the disclosure. detailed description
- FIG. 1 is a schematic flowchart of a manufacturing method of a MEMS device according to some embodiments of the present disclosure.
- the manufacturing method includes:
- Step S11 providing a glass substrate
- Step S12 forming a MEMS element on the glass substrate, the MEMS element including a diaphragm layer and a cavity for providing a vibration space for the diaphragm layer.
- the glass substrate is a glass substrate used in the display field, such as glass substrates used in different generations of lines in the display field.
- the size of the glass substrate used in the display field is larger than that of a silicon wafer substrate (mainly 6 inches). And 8 inches) are much larger and can realize the production of large array MEMS devices.
- the processing and manufacturing costs for manufacturing MEMS devices can also be reduced.
- the MEMS device is a diaphragm type MEMS device, that is, a large array type diaphragm type MEMS device can be realized on a glass substrate used in the display field, and the production cost of the MEMS device is reduced. At the same time, it is also beneficial to the diaphragm type MEMS device.
- the size of the glass substrate is greater than or equal to a preset size.
- the glass substrate is a square glass substrate.
- the minimum size of the glass substrate used in the display field is 370 mm ⁇ 470 mm (the glass substrate used in the 2.5 generation line). Therefore, optionally, the preset size is 370 mm ⁇ 470 mm.
- FIG. 2A shows a schematic flow chart of a method for forming a MEMS element on a glass substrate according to some embodiments of the present disclosure, including: Step S21: forming a sacrificial layer on the glass substrate and patterning the sacrificial layer to form the sacrificial layer pattern;
- Step S22 forming a diaphragm layer on the sacrificial layer pattern and patterning the diaphragm layer to form an etching hole, which penetrates the diaphragm layer and is connected to the sacrificial layer pattern;
- Step S23 removing the sacrificial layer pattern through the etching hole to form the cavity.
- the sacrificial layer pattern can be removed by etching holes penetrating the diaphragm layer, using dry etching, wet etching, or any other suitable method.
- the diaphragm layer pattern covers or surrounds the sacrificial layer pattern. After the sacrificial layer pattern is removed, the structure of the diaphragm layer will form a cavity, which is used as the vibration space of the diaphragm structure.
- FIG. 2B is a schematic flow chart of a method for forming a MEMS element on a glass substrate according to other embodiments of the present disclosure.
- the method includes:
- Step S201 forming a sacrificial layer on the glass substrate and patterning the sacrificial layer to form a pattern of the sacrificial layer;
- a deposition process may be used to form the sacrificial layer.
- Step S202 forming a supporting layer on the pattern of the sacrificial layer and patterning the supporting layer to form a pattern of the supporting layer, and the pattern of the supporting layer does not cover the pattern of the sacrificial layer or cover part of the pattern. State the graphics of the sacrificial layer;
- a deposition process may be used to form the support layer.
- the supporting layer and the sacrificial layer pattern may be arranged in the same layer, for example, the supporting layer pattern may be set to not overlap with the sacrificial layer pattern, or adjacent to each other, or a complementary pattern may be formed in the same film layer. Based on different MEMS device structures, the supporting layer pattern may also cover at least a part of the sacrificial layer pattern.
- Step S203 forming a diaphragm layer on the pattern of the sacrificial layer and the pattern of the supporting layer and patterning the diaphragm layer to form an etching hole, which penetrates the diaphragm layer and exposes Graphics of part of the sacrificial layer;
- a deposition process may be used to form the diaphragm layer.
- Step S204 removing the pattern of the sacrificial layer through the etching hole to form the cavity.
- the cavity is surrounded by a support layer pattern arranged around the sacrificial layer and a diaphragm layer pattern covering the sacrificial layer pattern away from the glass substrate.
- the pattern of the sacrificial layer can be removed by dry or wet etching.
- the sacrificial layer is used to form a cavity for forming a vibration space for the diaphragm layer, and the implementation process is convenient and simple.
- the material of the sacrificial layer can be selected according to specific needs, and it is required that the sacrificial layer is removed without causing damage to the diaphragm layer, support layer, etc., and the material of the sacrificial layer may be metal (such as aluminum, molybdenum). , Copper, etc.), it can also be a metal oxide (ITO, etc.), or an insulating material (such as silicon dioxide, silicon nitride, photoresist, etc.).
- the step of removing the pattern of the sacrificial layer through the etching hole and forming the cavity may further include: forming a filling pattern for filling the etching hole, so that the subsequently formed film layer Will not fall into the corrosion hole and affect performance.
- the filling pattern in addition to filling the etching hole, may also fill a part of the cavity below the etching hole.
- the MEMS components in the embodiments of the present disclosure are capacitive MEMS components, piezoelectric MEMS components, or piezoresistive MEMS components.
- the manufacturing methods of different types of MEMS components will be described in detail below.
- FIGS. 3A-3I are schematic flowcharts of a manufacturing method of a capacitive MEMS device according to an embodiment of the present disclosure.
- the manufacturing method includes:
- Step 31 Please refer to Figure 3A, provide a glass substrate 101;
- Step 32 Please refer to FIG. 3B, forming a pattern of the first electrode 102 on the glass substrate 101;
- Step 33 Please refer to FIG. 3C to form a sacrificial layer 103 on the pattern of the first electrode 102, and 103 is patterned to form the pattern of the sacrificial layer 103;
- Step 34 Referring to FIG. 3D, a support layer 104 is formed on the pattern of the sacrificial layer 103 and the support layer 104 is patterned to form a pattern of the support layer 104, and the pattern of the support layer 104 does not cover The pattern of the sacrificial layer 103;
- the pattern of the support layer 104 may also cover part of the pattern of the sacrificial layer 103.
- Step 35 Referring to FIG. 3E, a diaphragm layer 105 is formed on the pattern of the sacrificial layer 103 and the pattern of the support layer 104, and the diaphragm layer 105 is patterned to form an etching hole 106.
- the etching The hole 106 penetrates the diaphragm layer 105 and exposes part of the pattern of the sacrificial layer 103;
- Step 36 Please refer to FIG. 3F, removing the pattern of the sacrificial layer 103 through the etching hole 106 to form the cavity 107;
- Step 37 Refer to FIG. 3G to form a filling pattern 108 for filling the etching hole 106;
- Step 38 Refer to FIG. 3H, to form a pattern of a second electrode 109 on the diaphragm layer 105, the second electrode 109 (top electrode) can be made of conductive materials such as aluminum and ITO, and the thickness is between 100nm ⁇ 2um.
- the choice of top electrode material is related to the selected connection method. For connection by wire bonding, Al, Ag, Cu, etc., if the electrical connection is made by bonding, ITO can be used as the top electrode;
- Step 39 Referring to FIG. 31, a protective layer 110 is formed on the pattern of the second electrode 109, and formed to penetrate through the protective layer 110, the diaphragm layer 105, and the supporting layer 104 and expose a part of the The first connection hole 111 of the first electrode 102 and the second connection hole 112 that penetrates the protective layer 110 and exposes a part of the second electrode 109.
- a corrosion barrier layer 113 may be formed on the pattern of the first electrode 102 to avoid the process of removing the sacrificial layer 103.
- the first electrode 102 causes an influence.
- the first connection hole 111 needs to penetrate the protective layer 110, the diaphragm layer 105, the support layer 104 and the corrosion barrier layer 113.
- Figs. 4A-4K are a schematic flowchart of a manufacturing method of a piezoelectric MEMS device according to an embodiment of the present disclosure.
- the manufacturing method includes:
- Step 41 Please refer to Figure 4A, provide a glass substrate 201;
- Step 42 Referring to FIG. 4B, a sacrificial layer 202 is formed on the glass substrate 201 and the sacrificial layer 202 is patterned to form a pattern of the sacrificial layer 202;
- Step 43 Referring to FIG. 4C, a support layer 203 is formed on the pattern of the sacrificial layer 202 and the support layer 203 is patterned to form a pattern of the support layer 203, and the pattern of the support layer 203 does not cover The pattern of the sacrificial layer 202;
- the pattern of the support layer 203 may also cover part of the pattern of the sacrificial layer 202.
- Step 44 Referring to FIG. 4D, a diaphragm layer 204 is formed on the pattern of the sacrificial layer 202 and the pattern of the support layer 203 and the diaphragm layer 204 is patterned to form an etching hole 205.
- the etching The hole 205 penetrates the diaphragm layer 204 and exposes part of the pattern of the sacrificial layer 202;
- Step 45 Referring to FIG. 4E, the pattern of the sacrificial layer 202 is removed through the etching hole 205 to form the cavity 206;
- Step 46 Referring to FIG. 4F, forming a filling pattern 207 for filling the etching hole 205;
- Step 47 Referring to FIG. 4G, forming a pattern of the first electrode 208 on the diaphragm layer 204;
- Step 48 Please 4H, a pattern of the intermediate insulating layer 209 is formed;
- a piezoelectric material layer 210 is formed on the pattern of the first electrode 208 and patterned to form a pattern of the piezoelectric material layer 210.
- the piezoelectric material layer 210 may be deposited by sputtering
- the thickness of aluminum nitride is about 1 ⁇ 3um, or polyvinylidene fluoride (PVDF), the thickness is about 5um; when aluminum nitride is used for the piezoelectric layer 210, the first electrode 208 can be molybdenum as the bottom electrode;
- PVDF polyvinylidene fluoride
- 410 Referring to FIG. 4J, a pattern of a second electrode 211 is formed on the pattern of the piezoelectric material layer 210;
- Step 411 Referring to FIG. 4K, a protective layer 212 is formed on the pattern of the second electrode 211, and a first connection hole 213 penetrating through the protective layer 212 and exposing a portion of the first electrode 208 is formed, and The protection layer 212 exposes a part of the second connection hole 214 of the second electrode 211.
- the piezoelectric MEMS device manufactured according to the method shown in FIGS. 4A-4K can be used as a device provided with a closed air cavity, such as a piezoelectric MEMS microphone, a speaker, and a thin-film bulk acoustic resonator.
- the method exemplified in the present disclosure can also be used to fabricate MEMS devices with partially fixed structures such as cantilever beams, so as to use piezoelectric materials to realize applications such as acceleration sensors, ultrasonic transducers, and vibration energy harvesters.
- FIGS. 5A-5H are schematic flowcharts of a manufacturing method of a piezoresistive MEMS device according to an embodiment of the present disclosure.
- the manufacturing method includes:
- Step 51 Please refer to FIG. 5A to provide a glass substrate 301, where the glass substrate 301 may be 370mm*470mm*0.5mm, or a larger size, and the actual size may depend on the glass substrate requirements of the semiconductor display panel production line;
- Step 52 Referring to FIG. 5B, a sacrificial layer 302 is formed on the glass substrate 301 and the sacrificial layer 302 is patterned to form a pattern of the sacrificial layer 302, where the sacrificial layer 302 can be made of Mo, Al and other metals
- the material may also be made of insulating materials such as photoresist, polyimide (PI), etc., and the thickness of the sacrificial layer may be in the range of 140 nm to 5 um;
- Step 53 Referring to FIG. 5C, a support layer 303 is formed on the pattern of the sacrificial layer 302 and The supporting layer 303 is patterned to form a pattern of the supporting layer 303, and the pattern of the supporting layer 303 does not cover the pattern of the sacrificial layer 302;
- the pattern of the support layer 303 may also cover part of the pattern of the sacrificial layer 302.
- Step 54 Referring to FIG. 5D, a diaphragm layer 304 is formed on the pattern of the sacrificial layer 302 and the pattern of the support layer 303, and the diaphragm layer 304 is patterned to form an etching hole 305.
- the etching The hole 305 penetrates the diaphragm layer 304 and exposes a part of the pattern of the sacrificial layer 302.
- the diaphragm layer 304 can be made of silicon nitride or an insulating material such as silicon dioxide; the thickness of the diaphragm layer 304 can be In the range of 600nm ⁇ 2um;
- Step 55 Referring to FIG. 5E, the pattern of the sacrificial layer 302 is removed through the etching hole 305 to form the cavity 306;
- the sacrificial layer 302 may be corroded and released by an etching solution in a wet etching manner to form a cavity 306; the etching solution used for releasing the sacrificial layer should have a higher corrosion rate to the material of the sacrificial layer, Film layer 304, (optional)
- the corrosion stop layer and the bottom electrode are not corroded at all or the corrosion rate is extremely slow; if the etching solution does not corrode the bottom electrode or the corrosion is extremely slow and the diaphragm layer is insulated, the corrosion stop layer may not be provided;
- Step 56 Please refer to FIG. 5F to form a filling pattern 307 for filling the etching hole 305; when the piezoresistive MEMS device (such as a transducer) works in water or other liquid medium, a hole filling layer material is required The corrosion hole 305 is blocked to prevent the working medium from entering the cavity 306 and affecting the working characteristics of the MEMS device (such as a transducer).
- the material of the hole-filling layer can be silicon nitride, silicon dioxide, or amorphous silicon.
- the thickness of the hole filling layer should be equal to or thicker than the thickness of the diaphragm layer 304.
- Step 57 Referring to FIG. 5G, a pattern of a piezoresistive material layer 308 and a pattern of conductive lines 309 are formed on the diaphragm layer 304, and the piezoresistive material layer 308 is connected to the conductive lines 309.
- the material of the piezoresistive layer can be doped amorphous silicon or polysilicon crystallized by laser;
- Step 58 Referring to FIG. 5H, a protective layer 310 is formed on the pattern of the piezoresistive material layer 308 and the pattern of the conductive line 309, and a connection hole that penetrates the protective layer 310 and exposes a part of the conductive line 309 is formed 311.
- PVX silicon dioxide, silicon nitride, etc.
- a plurality of piezoresistive MEMS devices as described above can be formed, arranged in a one-dimensional or two-dimensional array and lead out the corresponding electrodes, so as to realize the distribution detection of the corresponding physical quantity signals.
- the above-mentioned piezoresistive MEMS device fabricated according to the method shown in FIGS. 5A-5H can be used as a pressure sensor, wherein the piezoresistive material layer 308 is configured as a Wheatstone bridge structure; when external pressure enters the cavity 306.
- the diaphragm layer 304 will be elastically deformed, destroying the balance of the original Wheatstone bridge circuit, and then output through the conductive wire 309 and the MEMS device sensed A voltage signal proportional to the pressure.
- the equipment, materials, and process conditions used to form the pattern on the MEMS device are all implemented based on the conditions for manufacturing the display panel, which are different from the silicon-based MEMS process used in the related art.
- CMUT capactive micromachined ultrasonic transducer
- PMUT pieoelectric micromachined ultrasonic transducer
- pressure sensor silicon microphone
- accelerometer speaker
- micromirror array etc.
- the embodiments of the present disclosure also provide a MEMS device, including:
- the MEMS element located on the glass substrate includes a diaphragm layer and a cavity for providing a vibration space for the diaphragm layer.
- the glass substrate is a glass substrate used in the display field, such as glass substrates used in different generations of lines in the display field.
- the size of the glass substrate used in the display field is larger than that of a silicon wafer substrate (mainly 6 inches). And 8 inches) are much larger and can realize the production of large array MEMS devices.
- the processing and manufacturing costs for manufacturing MEMS devices can also be reduced.
- the MEMS device is a diaphragm type MEMS device, that is, a large array type diaphragm type MEMS device can be realized on a glass substrate used in the display field, and the production cost of the MEMS device is reduced. At the same time, it is also beneficial to the diaphragm type MEMS device.
- the size of the glass substrate is greater than or equal to a preset size.
- the glass substrate is a square glass substrate.
- the MEMS element is a capacitive MEMS element. Please refer to FIG. 31 above.
- the MEMS element includes:
- the MEMS element is a piezoelectric MEMS element. As shown in FIG. 4K above, the MEMS element includes:
- the pattern of the first electrode 208 is the pattern of the piezoelectric material layer 210 on the side away from the glass substrate;
- the MEMS element is a piezoresistive MEMS element. As shown in FIG. 5H above, the MEMS element includes:
- the pattern of the piezoresistive material layer 308 and the pattern of the conductive line 309 are away from the protective layer 310 on the side of the glass substrate;
- the connecting hole 311 of the conductive wire 309 is penetrated through the protective layer 310 and exposed.
- FIG. 51 is a schematic plan view of a piezoresistive MEMS device according to an embodiment of the disclosure. Along the section line A-A in FIG. 51, a cross-sectional view of the piezoresistive MEMS element as illustrated in FIG. 5H can be obtained. It can be understood that, as an exemplary view, each part in the above schematic diagram does not correspond exactly according to actual scale or positional relationship.
- the piezoresistive MEMS device includes at least one corrosion hole 305, and the number and position of the corrosion hole can be set according to the requirements of the piezoresistive device.
- an etching hole 305 may be provided on the outer side of each corner of the rectangular structure to improve the production efficiency of the cavity 306.
- the orthographic projection of the etching hole 305 on the glass substrate and the orthographic projection of the cavity 306 on the glass substrate do not overlap, and the etching hole 305 and the cavity 306 are connected by a release channel 312.
- a filling pattern 307 is arranged in the etching hole area to seal the cavity, and the orthographic projection area of the filling pattern 307 on the glass substrate is greater than or equal to the orthographic projection area of the etching hole 305 on the glass substrate.
- the sacrificial layer 302 is corroded and released by an etching solution through a wet etching method to form the cavity 306.
- the etching hole 305 is used for injecting etching liquid
- the release channel 312 is used for connecting the etching hole 305 and the cavity 306.
- conductive wires 309 are arranged along the four sides of the cavity 306, and the conductive wires 309 It can include multiple sections of electrode traces.
- the number and position of the electrode traces can be set according to the cavity structure of the piezoresistive MEMS device.
- the cavity 306 has a rectangular structure
- a section of electrode trace is provided on each side of the cavity 306, and the projection of at least a part of the electrode trace on the glass substrate is similar to the projection of the cavity 306 on the glass substrate.
- the orthographic projections overlap.
- the extending direction of the electrode traces may be parallel to the side direction of the cavity 306, or may be arranged in other ways according to requirements; this disclosure does not limit this.
- the piezoresistive material layer pattern 308 may be arranged to at least partially overlap the cavity 306 and include a plurality of piezoresistive blocks.
- the specific number and position of the piezoresistive blocks can be set according to the cavity structure of the piezoresistive MEMS device.
- a piezoresistive block is provided on each side of the cavity 306, and multiple piezoresistive blocks may have the same extending direction.
- the extension direction of the piezoresistive block is the same as the extension direction of the side of the cavity 306, and the orthographic projection of the piezoresistive block on the glass substrate is located in the cavity 306 on the glass substrate.
- the extension direction of the piezoresistive block is perpendicular to the extension direction of the side of the cavity 306, and the orthographic projection of the piezoresistive block on the glass substrate is the same as that of the cavity.
- the orthographic projections of the cavity 306 on the glass substrate partially overlap.
- the MEMS devices in the above embodiments can be used as various devices such as CMUT, PMUT, pressure sensor, silicon microphone, accelerometer, speaker, micromirror array and so on.
- the embodiments of the present disclosure also provide a display substrate, which includes the MEMS device, the pixel unit array and the display control circuit in any of the above embodiments.
- the MEMS device can be manufactured on the glass substrate at low cost, and it is also beneficial to the integration of the diaphragm type MEMS device and the display module on the glass substrate.
- the MEMS device as described above can be integrated in a device that implements a display function through a pixel unit array and a display control circuit, so as to provide richer functions for more application scenarios.
- An embodiment of the present disclosure also provides a display device, including the above-mentioned display substrate.
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WO2024011328A1 (en) * | 2022-07-13 | 2024-01-18 | The University Of British Columbia | High speed manufacture of micro-electrical mechanical systems arrays |
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CN109734047B (zh) * | 2019-02-27 | 2021-03-23 | 京东方科技集团股份有限公司 | 一种mems器件及其制作方法、显示基板 |
CN110798916B (zh) * | 2019-11-19 | 2023-04-11 | 京东方科技集团股份有限公司 | 一种加热器及其制备方法、传感器、智能终端 |
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