Field Sequential Display Device Pixel Lifespan Extension
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Solution Overview
Problem
DMD reflective display devices suffer from irreversible luminescent or black spot defects due to fixed pixel states, leading to a decrease in the lifespan of the display element.
Innovation Solution
A field sequential image display device with a display element, illumination portions, and a control unit that manages pixel ON/OFF operations and illumination using a field sequential method, including a display period and a non-display period to prevent pixel fixation and balance ON/OFF burdens, thereby extending the lifespan of the display element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixels are fixed in a constant state of either ON or OFF for display, then the display image can be maintained, but luminescent spot defects or black spot defects occur and the lifespan of the display element decreases
Solution Approach 1:
The patent applies periodic action by dividing the frame period into display periods and non-display periods. During non-display periods, pixels that would otherwise remain fixed in ON or OFF states are dynamically switched, preventing luminescent spot defects and black spot defects while maintaining display functionality during display periods.
2Reliability
If the display period ratio is reduced to extend lifespan, then pixel fixation is suppressed, but the luminance of the display image decreases
Solution Approach 1:
The patent changes parameters by dynamically adjusting the display period ratio based on pixel state monitoring. When luminescent spot defects or black spot defects are detected, the display period ratio is reduced to extend lifespan; when not detected, the ratio is increased to maintain luminance, thus balancing lifespan extension with luminance maintenance.
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 effectively suppresses luminescent and black spot defects by ensuring balanced pixel operation and reducing the display period ratio, thereby prolonging the lifespan of the display element and maintaining consistent luminance.
Implementation Method 1
illumination portion, formed of a plurality of light emitting elements having different emission colors, which transilluminates a liquid crystal display element
Data Source
AI summary
Provided is a field sequential image display device with which the service life of DMD display elements can be lengthened. In the present invention, each frame is equipped with: a display period, wherein a display control portion normally drives multiple mirrors and a lighting control portion drives a first lighting portion and a second lighting portion, thereby displaying a display image in display elements; and a non-display period, wherein the display control portion drives the multiple mirrors for a non-display period and the lighting control portion turns off the first lighting portion and the second lighting portion, and thus the display image is not displayed in the display elements. On the basis of prescribed luminance control conditions, when the luminance of the display image is to be lower than a predetermined threshold luminance value, a control unit lowers the display period ratio, which is the ratio of the display period in each frame period.