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Aperture frame for liquid crystal display device
| Details |
Inventors: Day, Kevin; Slater, Andrew R.;
Assignee: Three-Five Systems, Inc. (Tempe, AZ)
Primary Examiner: Sherry; Michael J.
Assistant Examiner: Saricar; Asok Kumar
Attorney, Agent or Firm: Baker Botts LLP
Liquid crystal display devices having display screens with an improved black frame is provided. The microdisplay of the LCD is formed of a matrix of pixels disposed on the top surface of a silicon substrate, a layer of glass, and a layer of a reflective metal, preferably aluminum, which is disposed between the silicon substrate and layer of glass. The layer of reflective metal has a pattern, which forms a frame around the matrix of pixels, and is involved in generating the black frame when viewed by the user on the display screen. The reflective material functions to reflect light back to the light generating source, and thus displays a pure black image to the user. In another embodiment, a layer of reflective metal, preferably black chromium, patterned to form a frame around the matrix of pixels, is disposed on the top surface of the glass. The reflective metal layer on top of the glass may be used either in place of, or in addition to, the reflective metal layer on the bottom of the glass to generate the improved black frame. |
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DETAILED DESCRIPTION The present invention is directed to overcoming, or at least minimizing the drawbacks of the prior art liquid crystal display devices.
In one embodiment of the present invention, a LCD having an improved black frame is provided.
The microdisplay of the LCD according to the present invention has a matrix of pixels disposed on the top surface of a silicon substrate.
It also includes a layer of transparent material, preferably glass, having a top surface and a bottom surface.
The bottom surface of the layer of transparent material is disposed adjacent to the top surface of the silicon substrate.
A seal is disposed between the silicon substrate and the layer of transparent material.
The seal is arranged to form a perimeter around the matrix of pixels.
An annulus, is formed by a region bounded by the top surface of the silicon substrate, the bottom surface of the layer of transparent material, and the area inside of the perimeter formed by the seal.
The annulus is filled with a liquid crystal.
The liquid crystal which when activated (exposed to a voltage potential), twists, changing the polarity of any light directed on it.
This embodiment of the present invention further includes a layer of reflective material positioned between the top surface of the semiconductor substrate or back plane and the bottom surface of the layer of transparent material.
The layer of reflective material is patterned to form a frame around the matrix of pixels.
The layer of reflective material preferably includes a metal or metal alloys, e.
g.
, aluminum, platinum, chromium, copper, silver or any other metal or metal alloys having a reflectivity of at least 97%.
This embodiment of the present invention also includes a layer of conductive material that is disposed on the bottom surface of the layer of transparent material.
The layer of reflective material is preferably disposed on the layer of conductive material.
This embodiment further includes a plurality of transparent beads disposed in the annulus
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Manufacturing Materials 
