US5818564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Assembly including an active matrix liquid crystal display module
Assignee: Raychem Corp
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Filing: 1996-09-13
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Granted: 1998-10-06
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Expires: 2016-09-13
Abstract
Abstract An assembly for dissipating heat from an active matrix liquid crystal display module while avoiding developing thermally induced mechanical stresses which can adversely affect the electro-optical properties of the liquid crystal material is disclosed. The module is affixed to a circuit board containing electrical leads for connection to drive electronics, in a way such that the substrate containing the active matrix elements is suspended through a window or through-hole in the circuit board and is sunken or nested into a soft elastomeric gel which is electrically non-conductive but thermally conductive. The gel provides the requisite thermal conductivity to dissipate the heat via a heat sink with which the gel is in thermal contact.
Inventors
- 👤 David C. Gray
- 👤 Dana C. Chase, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:48
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133382; G02F1/133385; G02F1/136
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
179 words
An assembly comprising: (a) a base having a cavity; (b) a thermally conductive, electrically non-conductive gel material contained in the cavity; (c) a circuit board having a window therein and plural electrical leads thereon, the circuit board being supported on the base and positioned such that the window lies above the gel material; and (d) a liquid crystal display module, including (i) first and second substrates oriented in a generally face-to-face relationship, wherein the first substrate is transparent and has on its interior face a transparent electrode material electrically connected to an electrical lead on the circuit board and wherein the second substrate has on its interior face a plurality of active matrix elements and has plural bonding pads electrically connected to corresponding electrical leads on the circuit board; and (ii) liquid crystal material sandwiched between the first and second substrates; wherein the first substrate is supported on the surface of the circuit board facing away from the base and wherein the second substrate passes through the window in the circuit board and is sunken into the gel material.
Claim 2
Dependent Claim
179 words
An assembly comprising: (a) a base having a cavity; (b) a thermally conductive, electrically non-conductive gel material contained in the cavity; (c) a circuit board having a window therein and plural electrical leads thereon, the circuit board being supported on the base and positioned such that the window lies above the gel material; and (d) a liquid crystal display module, including (i) first and second substrates oriented in a generally face-to-face relationship, wherein the first substrate is transparent and has on its interior face a transparent electrode material electrically connected to an electrical lead on the circuit board and wherein the second substrate has on its interior face a plurality of active matrix elements and has plural bonding pads electrically connected to corresponding electrical leads on the circuit board; and (ii) liquid crystal material sandwiched between the first and second substrates; wherein the first substrate is supported on the surface of the circuit board facing away from the base and wherein the second substrate passes through the window in the circuit board and is sunken into the gel material.
Claim 3
Dependent Claim
14 words
An assembly according to claim 1, wherein the second substrate is a silicon wafer.
Claim 4
Dependent Claim
36 words
An assembly according to claim 2, wherein the liquid crystal material in the liquid crystal display module comprises a liquid crystal composite in which plural volumes of liquid crystal material are contained in a polymer matrix.
Claim 5
Dependent Claim
24 words
An assembly according to claim 3, wherein the gel material is a silicone gel having a thermal conductivity of at least about 1.0 watt/m-°K.
Claim 6
Dependent Claim
38 words
An assembly according to claim 3, wherein the gel material is a silicone gel filled with aluminum oxide in an amount between 5 and 70 weight % alumina, based on the combined weights of aluminum oxide and silicone.
Claim 7
Dependent Claim
22 words
An assembly according to claim 3, wherein the base is made of a material having a thermal conductivity greater than 50 watt/m-°K.
Claim 8
Dependent Claim
200 words
An assembly comprising: (a) a base having a cavity; (b) a thermally conductive, electrically non-conductive gel material contained in the cavity; (c) a circuit board having a window therein and plural electrical leads thereon, the circuit board being supported on the base and positioned such that the window lies above the gel material; and (d) a liquid crystal display module adhesively bonded to the circuit board with an electrically conductive adhesive, the liquid crystal display module including (i) first and second substrates oriented in a generally face-to-face relationship, wherein the first substrate is transparent and has on its interior face a transparent electrode material electrically connected to an electrical lead on the circuit board via the electrically conductive adhesive and wherein the second substrate has on its interior face a plurality of active matrix elements and has plural bonding pads electrically connected to corresponding electrical leads on the circuit board; and (ii) liquid crystal material sandwiched between the first and second substrates; wherein the first substrate is supported on the surface of the circuit board facing away from the base and wherein the second substrate passes through the window in the circuit board and is sunken into the gel material.
Claim 9
Dependent Claim
200 words
An assembly comprising: (a) a base having a cavity; (b) a thermally conductive, electrically non-conductive gel material contained in the cavity; (c) a circuit board having a window therein and plural electrical leads thereon, the circuit board being supported on the base and positioned such that the window lies above the gel material; and (d) a liquid crystal display module adhesively bonded to the circuit board with an electrically conductive adhesive, the liquid crystal display module including (i) first and second substrates oriented in a generally face-to-face relationship, wherein the first substrate is transparent and has on its interior face a transparent electrode material electrically connected to an electrical lead on the circuit board via the electrically conductive adhesive and wherein the second substrate has on its interior face a plurality of active matrix elements and has plural bonding pads electrically connected to corresponding electrical leads on the circuit board; and (ii) liquid crystal material sandwiched between the first and second substrates; wherein the first substrate is supported on the surface of the circuit board facing away from the base and wherein the second substrate passes through the window in the circuit board and is sunken into the gel material.
Claim 10
Dependent Claim
36 words
An assembly according to claim 7, wherein the liquid crystal material in the liquid crystal display module comprises a liquid crystal composite in which plural volumes of liquid crystal material are contained in a polymer matrix.
Claim 11
Dependent Claim
14 words
An assembly according to claim 8, wherein the second substrate is a silicon wafer.
Claim 12
Dependent Claim
24 words
An assembly according to claim 9, wherein the gel material is a silicone gel having a thermal conductivity of at least about 1.0 watt/m-°K.
Claim 13
Dependent Claim
38 words
An assembly according to claim 9, wherein the gel material is a silicone gel filled with aluminum oxide in an amount between 5 and 70 weight % alumina, based on the combined weights of aluminum oxide and silicone.
Claim 14
Dependent Claim
22 words
An assembly according to claim 9, wherein the base is made of a material having a thermal conductivity greater than 50 watt/m-°K.
Claim 15
Dependent Claim
206 words
An assembly comprising: (a) a base having a cavity; (b) a thermally conductive, electrically non-conductive gel material contained in the cavity; (c) a circuit board having a window therein and plural electrical leads thereon, the circuit board being supported on the base and positioned such that the window lies above the gel material; and (d) a liquid crystal display module, including (i) first and second substrates oriented in a generally face-to-face relationship, wherein the first substrate is transparent and has on its interior face a transparent electrode material electrically connected to an electrical lead on the circuit board and wherein the second substrate has on its interior face a plurality of active matrix elements and has plural bonding pads electrically connected to corresponding electrical leads on the circuit board; the second substrate being offset from the first substrate to expose the plural bonding pads which are electrically connected to the corresponding electrical leads via wire bonds; and (ii) liquid crystal material sandwiched between the first and second substrates; wherein the first substrate is supported on the surface of the circuit board facing away from the base and wherein the second substrate passes through the window in the circuit board and is sunken into the gel material.
Claim 16
Dependent Claim
206 words
An assembly comprising: (a) a base having a cavity; (b) a thermally conductive, electrically non-conductive gel material contained in the cavity; (c) a circuit board having a window therein and plural electrical leads thereon, the circuit board being supported on the base and positioned such that the window lies above the gel material; and (d) a liquid crystal display module, including (i) first and second substrates oriented in a generally face-to-face relationship, wherein the first substrate is transparent and has on its interior face a transparent electrode material electrically connected to an electrical lead on the circuit board and wherein the second substrate has on its interior face a plurality of active matrix elements and has plural bonding pads electrically connected to corresponding electrical leads on the circuit board; the second substrate being offset from the first substrate to expose the plural bonding pads which are electrically connected to the corresponding electrical leads via wire bonds; and (ii) liquid crystal material sandwiched between the first and second substrates; wherein the first substrate is supported on the surface of the circuit board facing away from the base and wherein the second substrate passes through the window in the circuit board and is sunken into the gel material.
Claim 17
Dependent Claim
46 words
An assembly according to claim 13, wherein the liquid crystal display module is adhesively bonded to the circuit board with an electrically conductive adhesive which forms an electrical connection between the transparent electrode material of the first substrate and an electrical lead on the circuit board.
Claim 18
Dependent Claim
14 words
An assembly according to claim 14, wherein the second substrate is a silicon wafer.
Claim 19
Dependent Claim
36 words
An assembly according to claim 15, wherein the liquid crystal material in the liquid crystal display module comprises a liquid crystal composite in which plural volumes of liquid crystal material are contained in a polymer matrix.
Claim 20
Dependent Claim
23 words
An assembly according to claim 16, wherein the gel material is a silicone gel having a thermal conductivity of at least 1.0 watt/m-°K.
Claim 21
Dependent Claim
45 words
An assembly according to claim 16, wherein the gel material is a silicone gel filled with a thermally conductive filler selected from the group consisting of aluminum oxide, silicon carbide, zinc oxide, aluminum nitride, ferric oxide, beryllium oxide, titanium dioxide, magnesium oxide, and boron nitride.
Claim 22
Dependent Claim
38 words
An assembly according to claim 16, wherein the gel material is a silicone gel filled with aluminum oxide in an amount between 5 and 70 weight % alumina, based on the combined weights of aluminum oxide and silicone.
Claim 23
Dependent Claim
22 words
An assembly according to claim 16, wherein the base is made of a material having a thermal conductivity greater than 50 watt/m-°K.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-10-05 | 2002-04-06 | 2002-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-10-05 | 2006-04-06 | 2006-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-10-05 | 2010-04-06 | 2010-10-06 | $7700.00 | Window Closed / Lapsed |