Instrument display apparatus

• US 5,128,659 A
• Filed: 09/18/1989
• Issued: 07/07/1992
• Est. Priority Date: 02/16/1988
• Status: Expired due to Term

• Current Assignee: KW Muth Company
• Original Assignee: K W Muth Company Incorporated (K. W. Muth)
• Inventors: Woodhall, Barnes W., Roberts, John K.
• Primary Examiner(s): Brier, Jeffery A.
• Application Number:
  US07/408,692
• Time in Patent Office: 1,023 Days
• Field of Search: 340/705, 340/795, 340/945, 340/947, 340/980, 350/174, 362/23, 362/29, 362/30, 116/48, 116/49, 359/13, 359/618, 359/629, 359/630
• US Class Current: 345/7
• CPC Class Codes: G02B 2027/0118 comprising devices for improving the contrast of the display / brillance control visibility
• CPC Class Codes: G02B 2027/012 comprising devices for attenuating parasitic image effects
• CPC Class Codes: G02B 2027/0194 with combiner of laminated type, for optical or mechanical aspects
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence
• CPC Class Codes: G02B 6/00 Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings

Abstract

An instrument display apparatus for use in combination with a substantially transparent panel including an instrument to be displayed positioned adjacent to the transparent panel and which is adapted to reflect ambient light onto the substantially transparent panel, and an artificial lighting assembly which is adapted to selectively supply light to the instrument whereby a reflection of the instrument may be viewed in the windscreen regardless of level of ambient natural light.

Claims

1. An instrument display apparatus for use by an operator who has a line of sight comprising:

a transparent panel;

a predetermined tint field made integral with the transparent panel and which provides the operator with substantially unrestricted viewing in all directions and which is operable to attenuate preselected wavelengths of light which pass through the tint field from all directions;

an instrument to be displayed disposed in a position adjacent to the transparent panel, and wherein the instrument has a dead front display face, and a means for illuminating the dead front display face, and wherein the dead front display face further includes at least one character, and wherein the dead front display face, when illuminated by the illumination means, emits light in the wavelengths which are attenuated by the tint field such that the character can be discerned, in reflection, when the operator looks through the tint field, and wherein the dead front display face substantially suppresses the reflection of ambient environmental light which strikes the dead front display face thereby substantially preventing the reflection of the character from appearing in the tint field unless the dead front display face is illuminated by the illumination means, and wherein the dead front display face further includes;

a transparent substrate;

a first translucent printed layer borne by the substrate and which passes light having wavelength attenuated by the tint field and which are emitted by the illumination means;

a second printed layer borne by the transparent substrate and which defines the boundary of the character and which has a color which provides contrast to the wavelengths of light passes by the first layer;

means for sensing the illumination level of the ambient environment; and

an electrical circuit borne by the instrument and coupling the sensing means with the illumination means and which is operable to automatically adjust the illumination means in a fashion whereby the illumination provided to the dead front display face corresponds to the ambient illumination level, and wherein the character appearing in reflection in the tint field has sufficient contrast relative to the ambient illumination level such that the character can be readily recognized by the operator when viewing through the tint field.

2. An instrument display apparatus as claimed in claim 1 and wherein the illumination means includes an incandescent halogen lamp.

3. An instrument display face as claimed in claim 1, and wherein the illumination means includes a lamp which is positioned in a remote location, and a light guiding pipe or fiber optic element which receives the light emitted by the lamp and delivers it to the instrument.

4. An instrument display face as claimed in claim 1, and wherein the illumination means includes a high intensity light emitting diode.

5. An instrument display apparatus comprising:

a transparent panel;

an enhancing film made integral with the transparent panel and which is operable to attenuate preselected wavelengths of light which pass through the enhancing film and which originate from all directions, the enhancing film providing unrestricted viewing through the transparent panel in all directions;

an instrument to be displayed disposed in proximity to the enhancing film and including means for illuminating the instrument, the instrument emitting light in the selected wavelengths attenuated by the enhancing film when the illumination means is energized whereby the image of the instrument appears in the enhancing film, and wherein the enhancing film further attenuates the selected wavelengths of light which originate from locations other than the illumination means whereby the contrast of the instrument image appearing in the enhancing film is further improved relative to the background ambient lighting conditions, and wherein the instrument further includes;

a first portion which is translucent and substantially nonreflective, and wherein the first portion passes light produced by the illumination means and having the wavelengths which are attenuated by the enhancing film;

a second portion positioned in close proximity to the first portion and which provides contrast for the first portion, and which further defines the instrument image which appears in reflection in the enhancing film, the second portion being substantially nonreflective;

means for sensing the illumination level of the ambient environment; and

an electrical circuit borne by the instrument and coupling the sensing means with the illumination means and which is operable to adjust the illumination means in a fashion whereby the illumination provided to the instrument corresponds to the ambient illumination level, and wherein the instrument image appearing in reflection in the tint field has sufficient contrast relative to the ambient illumination level such that the instrument image can be readily recognized by the operator when viewing through the tint field.

6. An instrument display apparatus for use by an operator who has a line of sight comprising:

a transparent panel which provides the operator with substantially unrestricted viewing in all directions and which further is operable to reflect light into the line of sight of the operator;

an instrument to be displayed positioned adjacent to the transparent panel and which includes a dead front display face, and a means for illuminating the dead front display face, and wherein the image of the display face appears in reflection in the transparent panel when the illumination means is energized, and wherein the dead front display face substantially suppresses the reflection of ambient natural light which strikes the dead front display face thereby substantially preventing the image of the display face from appearing in reflection in the transparent panel unless the illumination means is energized and wherein the dead front display face further includes;

a supporting substrate;

a first translucent area borne by the substrate and which passes light having wavelengths which are reflected by the transparent panel and which are emitted by the illumination means;

a second substantially nonreflective area borne by the substrate, and which defines the instrument image, and which further has a color which provides contrast to the wavelengths of light passes by the first area; and

an illumination control circuit borne by the instrument for adjusting the intensity of the illumination provided to the dead front display face by the illumination means.