Light filters for microelectronics
First Claim
1. In a process of making microelectronic color filter elements by microphotolithography, the improvement comprising, applying a layer of a substantially non-particulate filter coating material to a filter substrate, the filter coating material including a vehicle and a soluble dye incorporation therein, the soluble dye being heat stable and in combination with the vehicle being effective to produce a high color resolution, applying a photoresist to the layer of the filter coating material on the filter substrate, photographically imaging and developing the photoresist, the filter coating material imaging and developing with the photoresist, curing the color element to substantially insolubilize the color element, the cured filter element containing the stable dye being effective to consistently transmit and resolve colored light, the cured filter element containing the stable dye having a high electrical resistivity and a high dielectric strength.
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Accused Products
Abstract
Filters suitable for microelectronic uses and the like may be prepared directly on substrates either as monolithically integrated filters or as hybrid filters using a soluble dye material in a resin. The resin may be applied to microelectronic substrates and patterned by conventional microphotolithographic processes.
66 Citations
15 Claims
- 1. In a process of making microelectronic color filter elements by microphotolithography, the improvement comprising, applying a layer of a substantially non-particulate filter coating material to a filter substrate, the filter coating material including a vehicle and a soluble dye incorporation therein, the soluble dye being heat stable and in combination with the vehicle being effective to produce a high color resolution, applying a photoresist to the layer of the filter coating material on the filter substrate, photographically imaging and developing the photoresist, the filter coating material imaging and developing with the photoresist, curing the color element to substantially insolubilize the color element, the cured filter element containing the stable dye being effective to consistently transmit and resolve colored light, the cured filter element containing the stable dye having a high electrical resistivity and a high dielectric strength.
- 9. In a process of making microelectronic color filter elements by microphotolithography, the improvement comprising, applying a first layer of a substantially non-particulate filter coating material to a filter substrate, the filter coating material including a vehicle and a first soluble dye incorporated therein, the soluble dye being heat stable and in combination with the vehicle being effective to produce a high color resolution, applying a first photoresist to the layer of filter coating material on the filter substrate and imaging and developing the photoresist, the filter coating material imaging and developing with the photoresist and developing discrete first color elements on the substrate, curing the first color elements to substantially insolubilize the first color elements, applying a second layer of a substantially non-particulate filter coating material to the coating substrate, the second layer of filter coating material including a vehicle and a second soluble dye incorporated therein, the second soluble dye being heat stable and in combination with the vehicle being effective to produce a high color resolution, applying a second photoresist to the layer of filter coating material on the filter substrate and imaging and developing the photoresist, the filter coating material imaging and developing with the photoresist and developing discrete second color elements on the substrate, curing the second color elements to substantially insolubilize the second color elements, the second color elements forming a substantially planar array with the first color elements, the cured filter elements containing the stable dye being effective to consistently transmit and resolve colored light, the cured filter coating material having a high electrical resistivity and a high dielectric strength.
- 12. In a process of making microelectronic color filter elements by microphotolithography, the improvement comprising, applying a first layer of a substantially non-particulate filter coating material to a filter substrate, the filter coating material including a vehicle selected from the group consisting of readily soluble polyamic acid precursors of polyimide resins, polymers and copolymers of polyimide resins, and combinations thereof with water soluble resins, the vehicle having a first soluble dye incorporated therein, the soluble dye being heat stable and in combination with the vehicle being effective to produce a high color resolution, applying a first photoresist to the layer of filter coating material on the filter substrate and imaging and developing the photoresist, the filter coating material imaging and developing with the photoresist and developing discrete first color elements on the substrate, curing the first color elements to substantially insolubilize the first color elements, applying a second layer of a substantially non-particulate filter coating material to the filter substrate, the filter coating material including a vehicle selected from the group consisting of readily soluble polyamic acid precursors of polyimide resins, polymers and copolymers of polyimide resins, and combinations thereof with water soluble resins, the vehicle having a second soluble dye incorporated therein, the second soluble dye being heat stable and in combination with the vehicle being effective to produce a high color resolution, applying a second photoresist to the layer of filter coating material on the filter substrate and imaging and developing the photoresist, the filter coating material imaging and developing with the photoresist and developing discrete second color elements on the substrate, curing the second color elements to substantially insolubilize the second color elements, the second color elements being immediately adjacent to the first color elements and forming a substantially planar array with the first color elements, the array of cured filter elements containing the stable dye being effective to consistently transmit and resolve colored light, the cured filter material having a high electrical resistivity and a high dielectric strength.
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15. In a process of making microelectronic color filter elements by microphotolithography, the improvement comprising, applying a first layer of a substantially non-particulate filter coating material to a filter substrate, the filter coating material including a vehicle selected from the group consisting of polymers and copolymers of ODA and PMDA or ODA, PMDA and BTDA, the vehicle components being present in approximate stoichiometric amounts, and combinations thereof with water soluble resins, the vehicle having a first soluble dye incorporated therein, the soluble dye being heat stable above about 200°
- C., and in combination with the vehicle, the dye being effective to produce a high color resolution, applying a photoresist to the layer of filter coating material on the filter substrate, photographically imaging and developing the photoresist, the filter coating material imaging and developing with the photoresist to form discrete first color elements on the substrate, curing the first color elements to substantially insolubilize the first color elements, applying a second layer of a substantially non-particulate filter coating material to the filter substrate, the filter coating material including a vehicle selected from the group consisting of polymers and copolymers of ODA and PMDA or ODA, PMDA and BTDA, the vehicle components being present in approximate stoichiometric amounts, and combinations thereof with water soluble resins, the vehicle having a second soluble dye incorporated therein, the second soluble dye being heat stable above about 200°
C., and in combination with the vehicle, the dye being effective to produce a high color resolution, applying a photoresist to the layer of filter coating material on the filter substrate, photographically imaging and developing the photoresist, the filter coating material imaging and developing with the photoresist to form discrete second color elements on the substrate, curing the second color elements to substantially insolubilize the second color elements, the second color elements being immediately adjacent to the first color elements and forming a substantially planar array with the first color elements, the array of cured filter elements containing the stable dye being effective to consistently transmit and resolve colored light, at least one set of the color elements having a vehicle containing a modifying polymer selected from the group consisting of 4-APS, 3-APS or BAPS, the cured filter material having an electrical resistivity of above about 3×
1015 ohm-cm and a dielectric strength of above about 7×
105 volts/cm, abrading the array of cured filter elements to orient the filter coating material and provide alignment for liquid crystal material and applying a liquid crystal material to the oriented filter coating material.
- C., and in combination with the vehicle, the dye being effective to produce a high color resolution, applying a photoresist to the layer of filter coating material on the filter substrate, photographically imaging and developing the photoresist, the filter coating material imaging and developing with the photoresist to form discrete first color elements on the substrate, curing the first color elements to substantially insolubilize the first color elements, applying a second layer of a substantially non-particulate filter coating material to the filter substrate, the filter coating material including a vehicle selected from the group consisting of polymers and copolymers of ODA and PMDA or ODA, PMDA and BTDA, the vehicle components being present in approximate stoichiometric amounts, and combinations thereof with water soluble resins, the vehicle having a second soluble dye incorporated therein, the second soluble dye being heat stable above about 200°
Specification