Screen Driving Circuit for Image Display Devices
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Solution Overview
Problem
Conventional image display devices for vehicles face instability in screen movement control, particularly when transitioning between motion and stop states, requiring high drive current and manual adjustments to accurately follow movement profiles.
Innovation Solution
An image display device with a screen driving mechanism unit, memory unit, and screen driving circuit unit that generates and stores smoothed movement profiles to control the screen's movement, reducing drive current and voltage requirements, and considers the motional properties of the screen driving mechanism for precise movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high drive current and voltage are used to control screen movement, then the screen can follow movement profiles more accurately, but the stability during transitions between motion and stop states deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting drive waveform parameters (current, voltage, frequency) based on the screen's real-time motion state. The control device modifies drive parameters during transitions between motion and stop states to optimize both accuracy and stability, rather than using fixed high drive levels throughout operation.
Solution Approach 2:
The patent implements feedback control by monitoring the screen's actual movement and comparing it to the target movement profile. The control device uses this feedback information to adjust drive waveforms in real-time, particularly during state transitions, ensuring both accurate profile following and stable behavior without requiring excessively high drive currents.
2Use of energy by moving object
If drive current and voltage are reduced for stable control, then energy consumption decreases, but the ability to accurately follow movement profiles deteriorates
Solution Approach 1:
The patent applies dynamics by making the drive waveform characteristics variable rather than static. The control device dynamically adjusts drive parameters according to the screen's instantaneous motion state (moving vs. stopping), allowing low energy consumption during steady motion while providing enhanced drive capability only when needed for accurate profile following during transitions.
Solution Approach 2:
The patent uses periodic action by applying drive waveforms with specific frequencies and durations that correspond to the periodic nature of screen movement cycles. By timing drive pulses to coincide with critical phases of movement (particularly during transitions), the system achieves accurate profile following with minimized overall energy consumption.
3Device complexity
If manual adjustments are made to control screen movement, then device complexity is reduced, but the precision and stability of movement control deteriorates
Solution Approach 1:
The patent applies self-service by implementing an automated control device that independently generates and adjusts drive waveforms without requiring manual intervention. The control device autonomously monitors screen position, compares it to the target profile, and makes real-time adjustments to drive parameters, thereby maintaining high precision while actually increasing (not reducing) device complexity through automation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables stable control of screen movement at high speeds, reduces drive current and voltage, and allows accurate following of movement profiles, improving stability and precision, especially during transitions between motion and stop states.
Implementation Method 1
An image is formed on the screen by being irradiated with light from the light source
Implementation Method 2
The optical system generates a virtual image with the light from the screen
Data Source
AI summary
An image display device includes a light source, a screen, an optical system, a screen driving mechanism unit, a memory unit, and a screen driving circuit unit. An image is formed on the screen by being irradiated with light from the light source. The screen driving mechanism unit moves the screen in an optical axis direction of the light. A smoothed movement profile is obtained by smoothing a movement profile used as a target for moving the screen so as to make a moving speed of the screen vary gently. The memory unit stores screen driving waveform information that has been generated so that the screen follows the smoothed movement profile. The screen driving circuit unit drives the screen driving mechanism unit, based on the screen driving waveform information stored in the memory unit.