Integrated semiconductor light-emitting display array
First Claim
1. A composite integrated circuit LED display array comprising:
- a light-transmissive monolithic planar substrate of a single III-V crystal including a plurality of LED devices carried in the body of said substrate and forming an array of LED devices, each of said LED devices being adapted when energized to emit light at the back surface of said substrate, said LED devices being optically isolated from one another, the optical isolation being affected by a light-absorbing doped region between said LED devices, said doped region being adapted to absorb light emitted by the individual LED devices, each of said LED devices being constituted by at least one diode having a separate p-n junction at which said light is radiated, said junction being at the back surface of said crystal, said light being transmitted through said crystal for being observed at the front surface of said crystal;
a monolithic integrated circuit array of circuit elements corresponding to and adapted for energizing respective ones of said LED devices, said integrated circuit array being adjacent the back surface of said crystal; and
interconnection means sandwiched between said arrays for providing electrical interconnections between respective ones of said LED devices and circuit elements at said back surface, said circuit elements being selectively operable for independently energizing corresponding ones of said LED devices to emit light at said back surface, said light being transmitted through said substrate for being observed at the front surface of said substrate.
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Abstract
An integrated LED display array wherein light is emitted and observed through a light-transmissive substrate, i.e., single crystal, which carries a plurality of optically isolated LED assemblies. Scattering of light from individual assemblies is prevented by an optically absorbing doped region which optically isolates each assembly. Light is generated at the back of the single crystal and viewed through the crystal. The LED assemblies, preferably multicolor, are directly mated to energizing electronic circuitry, e.g., a monolithic integrated circuit, via appropriate interconnections sandwiched between the two. The energizing electronic circuitry comprise an array of circuit elements which provide the energizing currents for respective ones of the LED assemblies.
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Citations
15 Claims
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1. A composite integrated circuit LED display array comprising:
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a light-transmissive monolithic planar substrate of a single III-V crystal including a plurality of LED devices carried in the body of said substrate and forming an array of LED devices, each of said LED devices being adapted when energized to emit light at the back surface of said substrate, said LED devices being optically isolated from one another, the optical isolation being affected by a light-absorbing doped region between said LED devices, said doped region being adapted to absorb light emitted by the individual LED devices, each of said LED devices being constituted by at least one diode having a separate p-n junction at which said light is radiated, said junction being at the back surface of said crystal, said light being transmitted through said crystal for being observed at the front surface of said crystal; a monolithic integrated circuit array of circuit elements corresponding to and adapted for energizing respective ones of said LED devices, said integrated circuit array being adjacent the back surface of said crystal; and interconnection means sandwiched between said arrays for providing electrical interconnections between respective ones of said LED devices and circuit elements at said back surface, said circuit elements being selectively operable for independently energizing corresponding ones of said LED devices to emit light at said back surface, said light being transmitted through said substrate for being observed at the front surface of said substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A composite integrated circuit LED display array comprising:
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a light-transmissive planar substrate of a single III-V crystal carrying on the back side thereof of a plurality of optically isolated LED devices, the optical isolation being effected by a light-absorbing doped region between individual LED devices, said doped region being adapted to absorb light emitted by the individual LED devices, each of said LED devices being constituted by at least one diode having a separate p-n junction at which said light is radiated, said junction being at the back surface of said crystal, said light being transmitted through said crystal for being observed at the front surface of said crystal; and a planar integrated circuit array comprising memory and drive circuit elements corresponding to respective ones of said LED devices, said integrated circuit array being integrally joined to said light-transmissive substrate at the back side of said crystal, said memory circuit elements being selectively addressable to cause said drive circuit elements to independently energize the respective LED devices to emit light at said back surface, said light being transmitted through said substrate for being observed at the front surface of said substrate.
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Specification