HUD Display Switching With Overlap-Suppressed Light Timing
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Solution Overview
Problem
Existing head-up display (HUD) devices switch between virtual and real images using mechanical methods, which are slow and inefficient, leading to increased power consumption and potential image overlap during electrical switching.
Innovation Solution
A display control device that employs parallel control, conjunctive control, and overlapping lighting suppression to synchronize the termination and start operations of two display units, ensuring they do not overlap and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If electrical switching control is used to select between first and second display units, then switching time is reduced compared to mechanical switching, but current consumption increases when both display units are in operating state
Solution Approach 1:
The first display unit is shifted to non-display state before the second display unit is shifted to display state, and the second display unit is shifted to display state after the first display unit is shifted to non-display state. This preliminary action ensures that the display units do not operate simultaneously, reducing current consumption while maintaining fast electrical switching.
2Use of energy by moving object
If the display unit not in use is set to non-operating mode to reduce current consumption, then power consumption is reduced, but switching delay occurs when shifting from non-operating mode to operating mode
Solution Approach 1:
The display units are controlled in a periodic manner where one display unit is activated while the other is in non-display state. This periodic switching allows the system to maintain low power consumption by keeping one unit in non-operating mode while ensuring fast switching through proper timing control of the state transitions.
3Reliability
If sufficient time margin is provided between termination of one display unit and start of other display unit, then image overlap is prevented, but switching speed is reduced
Solution Approach 1:
The patent replaces mechanical switching with electrical switching control, using control signals to shift display units between display and non-display states. This substitution allows for precise timing control with minimal transition time, preventing image overlap while maintaining high switching speed. The control unit coordinates the state changes to ensure one unit is fully transitioned before the other activates.
4Speed
If both display units are kept in operating state to enable fast switching, then switching speed is improved, but current consumption increases
Solution Approach 1:
The first display unit is shifted to non-display state before the second display unit is shifted to display state. This preliminary action ensures that there is no period where both units are simultaneously in operating state, thereby reducing current consumption while maintaining fast switching performance through coordinated electrical control.
Data Source
AI summary
Control units of a display control device perform, in a switching period when display by one image generation unit out of a first image generation unit and a second image generation unit is terminated and display by the other image generation unit is started, a parallel control in which a display start operation is performed in parallel with a display termination operation, a conjunctive control in which an operation timing of the other image generation unit is determined with an operation timing of the one image generation unit as a starting point, and an overlapping lighting suppression control that prevents, in the switching period, an ON period of a light source unit in the one image generation unit and an ON period of a light source unit in the other image generation unit from temporally overlapping each other in at least a partial period.