Vehicular head up display
First Claim
Patent Images
1. A head up display for a vehicle, comprising:
- a light source provided on a back-surface side of an instrument panel located below a front wind shield in the vehicle compartment of the vehicle, said emitting light along a path;
a liquid crystal display unit provided on the back-surface side of the instrument panel along said path, said liquid crystal display unit filtering light from the light source to display light representing information; and
an optical element that directs light filtered by the liquid crystal display unit through an opening in the instrument panel to the front wind shield, light projected onto said front wind shield by said optical element forming an image on the wind shield; and
The front wind shield reflecting light from the optical element to generate a virtual image for a vehicle occupant;
the head up display further comprising;
a brightness-sensing means that senses brightness outside the vehicle;
a setting means that sets a light-control illumination of the light source to a value corresponding to the brightness outside the vehicle; and
control means that controls luminance of light emitted by the light source according to the brightness outside the vehicle and the light-control illumination;
wherein the light source has a plurality of embedded filaments, each of the embedded filaments having a luminance level different from a remainder of the plurality of embedded filaments; and
wherein the control means controls the illumination of light emitted by the light source by driving a filament with low luminance;
wherein said filament with low luminance selected according to the set control light illumination required, wherein a filament with lower luminance is selected according to a lower set control light illumination required.
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Abstract
A light source of a liquid crystal panel employed in a head up display for a vehicle has an embedded filament for emitting a light with high luminance and another embedded filament for emitting a light with low luminance. The embedded filament for emitting a light with low luminance is used for a first luminance range. On the other hand, the embedded filament for emitting a light with high luminance is used for a second luminance range. In addition, both the elements may be used at the same time for emitting a light with maximum luminance of the first range and the second range.
18 Citations
6 Claims
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1. A head up display for a vehicle, comprising:
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a light source provided on a back-surface side of an instrument panel located below a front wind shield in the vehicle compartment of the vehicle, said emitting light along a path;
a liquid crystal display unit provided on the back-surface side of the instrument panel along said path, said liquid crystal display unit filtering light from the light source to display light representing information; and
an optical element that directs light filtered by the liquid crystal display unit through an opening in the instrument panel to the front wind shield, light projected onto said front wind shield by said optical element forming an image on the wind shield; and
The front wind shield reflecting light from the optical element to generate a virtual image for a vehicle occupant;
the head up display further comprising;
a brightness-sensing means that senses brightness outside the vehicle;
a setting means that sets a light-control illumination of the light source to a value corresponding to the brightness outside the vehicle; and
control means that controls luminance of light emitted by the light source according to the brightness outside the vehicle and the light-control illumination;
wherein the light source has a plurality of embedded filaments, each of the embedded filaments having a luminance level different from a remainder of the plurality of embedded filaments; and
wherein the control means controls the illumination of light emitted by the light source by driving a filament with low luminance;
wherein said filament with low luminance selected according to the set control light illumination required, wherein a filament with lower luminance is selected according to a lower set control light illumination required.
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2. A head up display for a vehicle, comprising:
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a liquid crystal display unit that receives light from a light source, said liquid crystal altering said light from said light source to represent information as display light and form an image on a reflecting member in front of a driver seat in the vehicle for use by a vehicle driver;
a brightness-sensing means for detecting brightness outside the vehicle; and
control means for controlling luminance of light emitted by the light source according to brightness outside the vehicle sensed by said brightness-sensing means;
wherein the light source has a plurality of embedded filaments, each of the embedded filaments having a luminance level different from a remainder of the plurality of embedded filaments; and
wherein said filament with low luminance selected according to the set control light illumination required, wherein a filament with lower luminance is selected according to a lower set control light illumination required.
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3. A head up display for a vehicle, comprising:
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a light source provided on a back-surface side of an instrument panel located below a front wind shield in the vehicle compartment of the vehicle, said emitting light along a path;
a liquid crystal display unit provided on the back-surface side of the instrument panel along said path, said liquid crystal display unit filtering light from the light source to display light representing information; and
an optical element that directs light filtered by the liquid crystal display unit through an opening in the instrument panel to the front wind shield, light projected onto said front wind shield by said optical element forming an image on the wind shield; and
The front wind shield reflecting light from the optical element to generate a virtual image for a vehicle occupant;
the head up display further comprising;
a brightness-sensing means that senses brightness outside the vehicle;
a setting means that sets a light-control illumination of the light source to a value corresponding to the brightness outside the vehicle; and
control means that controls luminance of light emitted by the light source according to the brightness outside the vehicle and the light-control illumination;
wherein the light source has a plurality of embedded filaments, each of the embedded filaments having a luminance level different from a remainder of the plurality of embedded filaments;
the control means controlling the luminance of light emitted by the light source by driving a filament with a low luminance selected among the plurality of filaments when light emitted from said light source is set low; and
the control means controlling luminance of light emitted by the light source by driving at least a filament with a high luminance selected from the plurality of filaments when light emitted from said light source is set large. - View Dependent Claims (5, 6)
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4. A head up display for a vehicle, comprising:
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a liquid crystal display unit that receives light from a light source, said liquid crystal display unit modifying said light from said light source to represent information as display light to form an image on a reflecting member in front of a vehicle driver seat for use by a vehicle driver;
a brightness-sensing means for detecting brightness outside the vehicle;
a setting means for setting a light-control illumination of the light source to a value proportional to the brightness outside the vehicle; and
control means for controlling illumination of light emitted by the light source proportional to the brightness outside the vehicle, wherein the light source has a plurality of embedded filaments, each of the embedded filaments having a luminance level different from a remainder of the plurality of embedded filaments;
the control means controlling the luminance of light emitted by the light source by driving a filament with a low luminance selected among the plurality of filaments when light emitted from said light source is set low; and
the control means controlling luminance of light emitted by the light source by driving at least a filament with a high luminance selected from the plurality of filaments when light emitted from said light source is set large.
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Specification