Display Device Illumination Timing Control for Image Separation
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Solution Overview
Problem
Display devices experience luminance unevenness and image separation degradation due to the overlap of images from consecutive frames, caused by light emission from illumination units reaching unupdated display areas.
Innovation Solution
A display device with a transmission-type display member and an illumination member where the illumination units are arranged to emit light only after the sequential scanning of display units is completed, and the waiting time for light emission is nonlinearly decreased, particularly on the end portions, to minimize light emission in unupdated areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is emitted from illumination units to ensure adequate illumination of the display area, then illumination intensity is improved, but light reaches unupdated display areas causing image overlap and degradation of image separation characteristics
Solution Approach 1:
The illumination unit employs dynamic control of the light emitting period, adjusting the timing and duration of light emission based on the scanning progress of the display units. The light emitting period is set to end before the sequential scanning of the display area is completed, dynamically adapting to the scanning state to prevent light from reaching unupdated areas while maintaining adequate illumination during active scanning periods.
Solution Approach 2:
The system performs preliminary action by controlling the illumination unit to emit light only during the period when display units are being scanned. The light emitting period is predetermined and synchronized with the scanning process, ensuring that illumination is provided exactly when needed and stopped before scanning completes, thereby preventing light from reaching unupdated display areas that would cause image overlap.
2Stability of the object's composition
If the light emitting period of illumination units is extended to cover the entire scanning duration, then uniformity of illumination is improved, but images from consecutive frames overlap causing luminance unevenness
Solution Approach 1:
The illumination unit operates with periodic action by emitting light in discrete light emitting periods that are synchronized with each scanning cycle. The light emitting period is repeatedly activated and deactivated in sync with the sequential scanning of display units, providing uniform illumination during active scanning while preventing light from reaching unupdated areas, thereby avoiding luminance unevenness caused by image overlap.
3Reliability
If illumination units are scanned in synchronization with display area scanning, then image separation characteristics are improved, but light emitted during scanning causes bright lines or dark lines near boundaries
Solution Approach 1:
The system applies local quality by differentiating the illumination behavior at different spatial locations. The light emitting period is specifically controlled to account for the scanning progress, ensuring that illumination is provided where needed while preventing light from reaching boundary areas that would cause bright or dark lines. This localized control of light emission timing resolves the contradiction between image separation and luminance uniformity.
Data Source
AI summary
A display device includes: a transmission-type display member having a display area that is sequentially scanned; and an illumination member that is arranged on a rear face of the display member and includes a plurality of illumination units that are arranged so as to be aligned in a direction from one end portion side toward the other end portion side along a direction in which the display area is sequentially scanned. The illumination unit is in a light emitting state over a predetermined light emitting period after sequential scanning of display units formed from a portion of the display area, which corresponds to the illumination unit, is completed, and the illumination units are sequentially scanned from one end portion side to the other end portion side in accordance with the sequential scanning of the display area.