Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Patent
1989-09-25
1991-04-16
O'Shea, Sandra L.
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
340718, 340719, 357 13, H01L 2906, H01L 2944
Patent
active
050085905
ABSTRACT:
For satisfactory operation of a display arrangement having an electro-optical display medium and picture elements arranged between row and column electrodes and connected in series with an anti-parallel arrangement of PIN diodes, the diodes should have a small reverse current notwithstanding any ambient radiation present. In a display arrangement according to the invention, a small photo-current in the reverse direction is obtained due to the fact that the i-region and the p- or n-type region do not adjoin each other directly in the proximity of the edge of the mesa-shaped PIN diode. The region within which the aforementionhed regions adjoin each other is preferably located at a distance from the edge of the mesa-shaped PIN diode amounting to at least once the penetration depth of the ambient radiation plus the diffusion length of charge carriers in the i-region. Due to such a construction of the PIN diode, the electrical field becomes substantially zero with reverse voltage in the proximity of the edge of the diode and hence ther sensitivity of a display arrangement according to the invention to ambient radiation, especially to the ambient radiation laterally incident on the diode, becomes considerably lower.
REFERENCES:
patent: 4583087 (1986-04-01), van de Venne
patent: 4748445 (1988-05-01), Togashi et al.
patent: 4811006 (1989-03-01), Kuijk
Huisman Frederikus R. J.
Martens Jan W. D.
Oversluizen Gerrit
Biren Steven R.
O'Shea Sandra L.
U.S. Philips Corp.
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