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EP0174497A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Electronic instrument panel

Assignee: Hitachi Ltd
•
Filing: 1985-08-07
•
Granted: —
•
Expires: 2005-08-07
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Abstract

Abstract In a color liquid crystal type electronic instrument panel, the quantity of light to be radiated from a background light source (2) is changed in accordance with a color to be displayed. The color liquid crystal type electronic instrument panel is of the type that a plurality of plural-primary-color stripe filters are disposed on each segment of a display element (1) in the longitudinal direction of the segment; a voltage is applied to electrodes corresponding to the stripe filters having a color selected based on the contents to be displayed, and the background light source is positioned at the back of the display element to enable color-displaying. A device (50) for detecting the brightness of outdoor light is further provided in the liquid crysta! display type electronic instrument panel, wherein the quantity of light to be radiated from the background light source is changed in accordance with a detected signal by the detecting device.

Inventors

  • 👤 Kouzou Katogi
  • 👤 Osamu Igarashi
  • 👤 Keiichi Tokuyama
  • 👤 Hirohisa Yamamura
  • 👤 Seiji Suda

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 09:44
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/3406; G01D11/00; G01D11/28; G09G2320/00; G09G2320/06; G09G2320/0626; G09G2320/0633; G09G2320/064; G09G2320/0653; G09G2360/00; G09G2360/14; G09G2360/144

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 52 words
An electronic instrument panel of a liquid crystal display type using primary color stripe filters and being capable of color-displaying each segment of a display element (1); wherein the quantity of light of a background light source (2) is controlled in accordance with a color to be displayed on said display element.
Claim 2
Dependent Claim 52 words
An electronic instrument panel of a liquid crystal display type using primary color stripe filters and being capable of color-displaying each segment of a display element (1); wherein the quantity of light of a background light source (2) is controlled in accordance with a color to be displayed on said display element.
Claim 3
Dependent Claim 27 words
An electronic instrument panel according to claim 1, wherein a color to be displayed on said display element is changed based on the contents to be displayed.
Claim 4
Dependent Claim 84 words
An electronic instrument panel according to claim 1 comprising; outdoor light detection means (50) for detecting the brightness of outdoor light and generating a control signal; and AC voltage generating means for generating an AC voltage for illuminating a fluorescent lamp (2) used as said background light source, said AC voltage generating means being capable of controlling the root mean square value of said AC voltage; wherein said root mean square value of said AC voltage is controlled in accordance with said control signal.
Claim 5
Dependent Claim 46 words
An electronic instrument panel according to claim 3, wherein a delay time is incorporated in controlling by said control signal the root mean square value of said AC voltage, and said delay time is changed in accordance with the direction of change of said control signal.

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