Indicating instrument for vehicle
AssigneeDenso Corporation
InventorsTakaaki Muramatsu, Toshiki Wada
Life of this patent
Estimating the term…
Abstract
An indicating instrument for a vehicle has a display board and a light modulation member disposed to cover a surface of the display board. When a condition that an illumination intensity of the display board is lower than a threshold value has continued for a first time period, a light transmissivity of the light modulation member is controlled to a first level so that a driver can easily see the display board. When a condition that the illumination intensity of the display board is equal to or higher than the threshold value has continued for a second time period, the light transmissivity of the light modulation member is controlled to a second level that is lower than the first level to restrict entry of external light to the display board.
Claims13
An indicating instrument for a vehicle, comprising:
- a display board;
- a light modulation member located in front of the display board, the light modulation member having variable light transmissivity;
- a light detecting member disposed to detect a quantity of external light incident on the display board;
- and
- a control unit for controlling the light transmissivity of the light modulation member, wherein
- the control unit controls the light transmissivity of the light modulation member to a first level when a condition that the quantity of external light is lower than a threshold value has continued for a first time period, and to a second level that is lower than the first level when a condition that the quantity of external light is equal to or higher than the threshold value has continued for a second time period.
An indicating instrument for a vehicle, comprising:
- a display board having a display surface;
- a light modulation member located in front of the display board, the light modulation member having variable light transmissivity;
- a light detecting member disposed to detect an illumination intensity of the display surface;
- and
- a control unit for controlling a light transmissivity of the light modulation member, wherein
- the control unit controls the light transmissivity of the light modulation member to a first level when a condition that the illumination intensity is lower than a threshold value has continued for a first time period and to a second level that is lower than the first level when a condition that the illumination intensity is equal to or higher than the threshold value has continued for a second time period.
A method of controlling a light transmissivity of a light modulation member of an indicating instrument, comprising:
- detecting an illumination intensity of a display board;
- determining a change of the illumination intensity;
- and
- controlling the transmissivity of a light transmissive member, wherein the transmissivity is controlled to a first level when a condition that the illumination intensity is lower than a threshold value has continued for a first time period and to a second level that is lower than the first level when a condition that the illumination intensity is equal to or higher than the threshold value has continued for a second time period.
Dependencies are inferred from the claim text.