Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Patent
1998-06-17
2000-10-24
Day, Michael H.
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
313500, 313509, H05B 3314, H05B 3326
Patent
active
061372226
ABSTRACT:
An electroluminescent display panel which is able to selectively display different colors by changing a voltage level imposed thereon is made in a simple structure. A first luminescent layer (4) emitting green light, for example, and a second luminescent layer (5) emitting orange light, for example, are directly laminated on each other without interposing an intermediate electrode therebetween. The second luminescent layer covers only a part of the first luminescent layer to form a single layer portion and a double layer portion. The single layer portion emits green light at a low voltage level, while the double layer portion emits lemon light having a higher luminance at a high voltage level. The display may be made in a form of a matrix or a certain pattern. The display panel may be used as an instrument panel for an automobile. The green light display is used at night time, while the lemon light display with a high luminance is used at day time to cope with sun light.
REFERENCES:
patent: 4924144 (1990-05-01), Menn et al.
patent: 5156924 (1992-10-01), Taniguchi et al.
patent: 5693428 (1997-12-01), Fujii et al.
patent: 5932327 (1999-08-01), Inoguchi et al.
Hattori Yutaka
Inoguchi Kazuhiro
Ishihara Hajime
Uchida Tomoya
Day Michael H.
Denso Corporation
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