CAR-MOUNTED DISPLAY AND CAR NAVIGATION SYSTEM

• Main Authors: OCHIAI, MASAHIRO, MAEKAWA, TOSHIKAZU, YAMAGUCHI, HIDEMASA, INO, MASUMITSU
• Format: Patent
• Language: English; French; Japanese
• Published: 10.04.2003
• Edition: 7
• Subjects: ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES; ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; BLASTING; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; GYROSCOPIC INSTRUMENTS; HEATING; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; LIGHTING; MEASURING; MEASURING DISTANCES, LEVELS OR BEARINGS; MECHANICAL ENGINEERING; NAVIGATION; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PERFORMING OPERATIONS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY; PHYSICS; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SURVEYING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TESTING; TRANSPORTING; VEHICLES IN GENERAL; WEAPONS

A car−mounted display such that the visibility of the displayed image from the driver's seat and the front passenger's seat is improved and the reflection of the displayed image in the front door windows is eliminated and a car navigation system using the display as a monitor are disclosed. When a liquid crystal display is installed at the center of the dashboard, the variation of the luminance or contrast is so set as to be below about 20 dB (ten times) in the range up to about 40° to the left and right from the center. Therefore, the visibility from both the driver's seat and the front passenger's seat is made most suitable. The luminance or contrast is so set as to decrease by −20 dB or more in the range over about 40° from the center to the left and right. A car-mounted display such that the visibility of the displayed image from the driver's seat and the front passenger's seat is improved and the reflection of the displayed image in the front door windows is eliminated and a car navigation system using the display as a monitor are disclosed. When a liquid crystal display is installed at the center of the dashboard, the variation of the luminance or contrast is so set as to be below about 20 dB ten times in the range up to about 40° to the left and right from the center. Therefore, the visibility from both the driver's seat and the front passenger's seat is made most suitable. The luminance or contrast is so set as to decrease by -20 dB or more in the range over about 40° from the center to the left and right. L'invention concerne un écran installé dans un véhicule de manière à améliorer la visibilité de l'image présentée depuis le siège du conducteur et le siège passager avant, et à éliminer la réflexion de l'image présentée sur les vitres des portières avant. Elle concerne également un système de navigation pour véhicule utilisant l'écran comme moniteur. Lorsqu'un écran à cristaux liquides est installé au centre du tableau de bord, la variation de la luminance ou du contraste est réglée de façon à être inférieure à environ 20 dB (10 fois) dans une plage pouvant atteindre environ 40 DEG relativement à la gauche et à la droite à partir du centre. On obtient ainsi une visibilité optimale depuis le siège du conducteur et le siège passager avant. La luminance ou le contraste est réglée de façon à diminuer de -20 dB ou plus dans une plage supérieure à environ 40 DEG relativement à la gauche et à la droite à partir du centre.