DMD Display Hinge Life Extension via Periodic Non-Display Cycles
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Solution Overview
Problem
High-temperature environments cause irreversible luminescent spot defects and reduce the lifespan of Digital Micro-mirror Device (DMD) display elements in vehicular head-up displays when driven using conventional methods.
Innovation Solution
Implementing a field sequential image display apparatus with a non-display period that alternates the ON/OFF state of pixels in a controlled cycle, equalizes ON and OFF burdens, and incorporates temperature detection to adjust the non-display proportion, thereby reducing stress on the display element's hinges and preventing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display element is driven using conventional methods in high-temperature environment, then the display function is maintained, but irreversible luminescent spot defects occur and lifespan decreases
Solution Approach 1:
The patent implements periodic action by dividing the display operation into display periods and non-display periods. During non-display periods, pixels are turned off to allow recovery of the hinge mechanism, preventing cumulative stress that leads to luminescent spot defects. This periodic on-off cycling extends the display element's lifespan while maintaining display function during active periods.
Solution Approach 2:
The patent applies dynamics by making the display element's operation dynamic rather than static. The display period and non-display period are adjusted based on temperature conditions, with the non-display proportion increasing in high-temperature environments. This dynamic adaptation allows the system to respond to environmental conditions and prevent thermal stress accumulation.
2Reliability
If the non-display proportion is increased to reduce stress on pixels, then lifespan is extended, but display luminance may change drastically
Solution Approach 1:
The patent implements feedback control by monitoring temperature conditions and adjusting the non-display proportion accordingly. The control unit receives temperature information and dynamically modifies the ratio of display period to non-display period. This feedback mechanism ensures that lifespan extension measures are activated only when necessary (in high-temperature conditions) while maintaining normal display luminance in moderate conditions.
Solution Approach 2:
The patent applies parameter changes by modifying the temporal parameters of display operation. The display period and non-display period are adjusted as controllable parameters, with their proportions changing based on temperature. This allows the system to extend lifespan through parameter optimization without permanently affecting display luminance characteristics.
Data Source
AI summary
There has been room for improvement in terms of increasing the life of display elements which have occurrences of irreversible bright point defects and black point defects and shortened lives of display elements when DMDs, which are reflective display devices, are used in high temperature environments such as being installed in vehicles. In the present invention, a display control means displays a display image in display elements. An illumination control means drives various illumination means in each subframe into which a frame of the display image is temporally divided, by a field sequential system. The frame is provided with a display period in which the display image is displayed in the display elements by the display control means normally driving a plurality of pixels and the illumination control means driving the illumination means and a non-display period in which the display image is not displayed in the display elements by the display control means engaging in non-display period drive of the plurality of pixels and the illumination control means turning off the illumination means.