1 Introduction
The interior lighting system of the car is chosen by most users to purchase cars in daylight hours with good lighting conditions, so lighting problems inside the car are often neglected. However, when driving in an environment with poor external lighting conditions, it may be difficult to quickly and accurately read various types of driving information fed back by the automobile instrument, and the efficiency of information reading is significantly reduced. If the interior lighting does not respond in time, the lack of lighting will bring tension to the user's mind, which inevitably increases the probability and psychological burden of the user's misoperation.
2 Lighting design should follow the law of vision
The human eye's reflection on light is divided into bright adaptation and dark adaptation. Ming adaptation refers to the human eye turning from dark to bright, this process takes about 60 seconds; on the contrary, dark adaptation takes about 30 minutes, when the user exercises from the normal lighting environment. In environments where lighting is lacking, such as tunnels, bridges, and underground garages, users may experience temporary obstacles in obtaining driving information.
First of all, in the lighting design, it is necessary to cooperate with the driving computer. The driving computer senses the change of the external lighting at any time, and automatically adjusts the lighting of the interior according to the lighting conditions of the external environment, or the user manually adjusts according to the actual demand. As shown in Figure 1: a car adds an adjustment wheel to the steering wheel to adjust the light to better adjust the light according to your needs.
Figure 1 Illumination adjustment wheel integrated on the steering wheel
Secondly, in the lighting design, if the light directly enters the user's eyes, it will produce glare. The glare will cause the user to feel discomfort due to strong visual stimulation, which seriously affects the driving safety of the user. The light required for automotive instrumentation illumination needs to be transmitted to the user's eye in the form of reflection or diffraction to avoid glare, allowing the illumination to be within the visual threshold acceptable to the human eye.
Thirdly, it is necessary to scientifically and rationally manage the color design of the light source. Because the user is affected by factors such as age, gender, personality, occupation, aesthetic psychology, etc., different colors will produce different likes and dislikes. For example, the sports style models choose red and orange in the warm color as the main light source color, the color purity is high, the light penetration is good, the sports style is outstanding, and the reasonable stimulation of the user's psychology is enhanced to generate a stronger driving desire; On the contrary, the business style models choose blue or white in the cool color as the main light source. After the light source is mixed, the color purity is reduced, which caters to the low-key and implicit psychological needs of the business vehicle users.
3 Optimize lighting to assist in the transmission of information and improve information feedback efficiency
As the additional functions of the car continue to enrich, it is followed by more and more information feedback from these on-board devices, users need to control more than simple driving. This means that users need to respond to more information feedback during the driving process. The increased information feedback will distract the driver and increase the risk of driving. The intervention of a large amount of information will inevitably interfere with the driving behavior of the user. The lighting design designer can adjust the illumination value of the light and perform color management according to the visual rule, and effectively filter the feedback information of the instrument. Can also be controlled by the traffic computer and the user behavior related to the current operation information of the carriageway luminance value, luminance value increase core information, secondary information is decreased luminance value, reducing the user's visual capacity per unit time, data from different types of feedback The color classification control adopts constant flashing illumination on the sudden warning information to stimulate the user and improve the user's attention to guide the user's operation. As shown in Figure 2, meter illumination filters information through different levels of LED illumination intensity.
Figure 2 Filtering information through different levels of light sources