Electroluminescent panel

• US 5,346,776 A
• Filed: 03/19/1992
• Issued: 09/13/1994
• Est. Priority Date: 12/29/1988
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Tanaka, Koichi, Mikami, Akiyoshi, Yoshida, Masaru, Taniguchi, Kouji, Terada, Kousuke
• Primary Examiner(s): Nold, Charles R.
• Application Number:
  US07/853,938
• Time in Patent Office: 908 Days
• Field of Search: 313/506, 313/507, 313/509, 428/690, 428/917, 428/67, 428/141
• US Class Current: 428/690
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
• CPC Class Codes: H05B 33/12 Light sources with substantially two-dimensional radiating surfaces
• CPC Class Codes: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source
• CPC Class Codes: H05B 33/22 characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

A multi-color electroluminescent panel comprising common electrodes and a plurality of transparent electrodes, an EL light emitting layer disposed between the common and transparent electrodes and capable of exhibiting a hysteresis in light emission luminance versus applied voltage characteristic, and band-pass color filters provided on the EL light emitting layer for passing therethrough light of a particular color emitted from the EL light emitting layer.

Claims

1. An electroluminescent panel, comprising:

first and second electrodes;

first and second insulating layers disposed between said first and second electrodes;

light emitting layer means, disposed between said first and second insulating layers for generating light as a function of a voltage applied by said first and second electrodes, said light emitting layer means having a plurality of cavities formed therein which limit propagation of the generated light within said light emitting means; and

a photo-conductive layer disposed between said first electrode and said first insulating layer to give a hysteresis in light emission luminance versus applied voltage characteristic.

2. An electroluminescent panel, comprising:

first and second electrodes;

first and second insulating layers disposed between said first and second electrodes;

light emitting layer means, disposed between said first and second insulating layers for generating light as a function of a voltage applied by said first and second electrodes, said light emitting layer means having a plurality of cavities formed therein which limit propagation of the generated light within said light emitting means; and

a photo-conductive layer disposed between said first electrode and said first insulating layer to give a hysteresis in light emission luminance versus applied voltage characteristic wherein the photo-conductive layer is Si_x C_1-x where 0<

x<

1 and wherein at least one of said cavities contains a light shielding material.

3. An electroluminescent panel, comprising:

a plurality of picture elements including a first and second picture element, each picture element comprising;

first and second electrodes;

a light emitting portion disposed between said first and second electrodes, wherein said light emitting portion generates light as a function of a voltage developed between said first and second electrodes; and

a photoconductive layer disposed between said first electrode and said first insulating layer to give a hysteresis in light emission luminance versus applied voltage characteristic;

wherein the panel further comprises a light shielding material disposed between the light emitting portion of the first picture element and the light emitting portion of the second picture element.