Vehicle Display Panel Segmentation for Warning Visibility
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Solution Overview
Problem
Conventional liquid crystal display apparatuses in vehicles struggle to effectively display meter and warning images under low external light conditions, as they suppress overall brightness to improve visibility, which compromises the attention-catching purpose of outside and warning images.
Innovation Solution
A vehicle display apparatus with a liquid crystal panel, an illumination unit, and a control unit that adjusts the gradation ratios and light emission brightness of meter and warning images independently, ensuring the warning image stands out while maintaining sufficient visibility of the meter image by setting the warning gradation ratio greater than the meter gradation ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the overall brightness of the liquid crystal display is suppressed by decreasing the gradation value of pixels or light emission brightness of the lighting device, then the ease of viewing meter images is improved, but the warning images and outside images fail to achieve their attention-catching purpose
Solution Approach 1:
The display panel is segmented into multiple pixel types with different functions: meter display pixels for routine information and warning display pixels for critical alerts. Each segment can be controlled independently with different brightness levels, allowing meter images to be dimmed for comfort while warning images maintain high brightness to capture attention.
Solution Approach 2:
Different regions of the display are assigned different quality characteristics. Meter display pixels use lower gradation values for comfortable viewing, while warning display pixels use higher gradation values or enhanced light emission to ensure visibility and attention-grabbing effect. This local differentiation resolves the contradiction between overall brightness suppression and specific warning visibility.
2Illumination intensity
If the light emission brightness of the lighting device is decreased to suppress overall display brightness, then viewing comfort during night is improved, but the visibility of critical warning images is compromised
Solution Approach 1:
The lighting device is segmented into separate illumination paths for meter pixels and warning pixels. The meter display pixels receive reduced light emission brightness for comfortable night viewing, while warning display pixels receive enhanced or maintained light emission to ensure critical information remains visible and reliable regardless of overall brightness suppression.
Solution Approach 2:
The system changes the illumination parameters selectively: overall light emission brightness is decreased for comfort, but the gradation value and light emission of warning pixels are increased or maintained to compensate. This parameter differentiation ensures that while overall illumination is reduced for night comfort, critical warning images maintain sufficient brightness for reliable visibility.
Data Source
AI summary
A display apparatus for use in a vehicle has a liquid crystal display panel, and the panel includes a first pixel area for displaying a meter image that represents vehicle condition values, and a second pixel area for displaying an outside image that calls attention of occupants as a warning image. Further, an input unit of the apparatus receives inputs of adjustment value from occupants of the vehicle for adjusting brightness of the meter image and the outside image. A main control unit and a drawing unit of the apparatus cooperatively serve as a controller of the apparatus by changing gradation ratio of the first and second pixel areas so that the gradation ratio of the second pixel area becomes greater than the gradation ratio of the first pixel area according to the input of the adjustment value.