Display Device Crosstalk Reduction via Pixel Voltage Control
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Solution Overview
Problem
Display devices that simultaneously show visible-light and infrared-light videos using a frame sequential method often experience crosstalk due to residual images from infrared-light videos persisting after switching to visible-light videos, which is undesirable when displaying images with different wavelength bands.
Innovation Solution
A display device comprising multiple display elements, a first light source for visible light, a second light source for infrared light, a signal synthesizing unit, a pixel control unit, and a light source control unit, where the pixel control unit alternates voltage control based on input signals during infrared light emission and sets other elements to a constant voltage, reducing crosstalk by ensuring proper voltage orientation during visible light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If video signals for visible-light and infrared-light are output in a sequential manner using frame sequential method, then both visible-light video and infrared-light video can be displayed on the same display device, but residual images from infrared-light video remain present after switching to visible-light video causing crosstalk
Solution Approach 1:
The patent applies preliminary action by turning off the infrared light source before switching to visible-light video display. This preliminary cessation of infrared illumination prevents the persistence of infrared images on the display device, thereby eliminating crosstalk when transitioning to visible-light content. The control unit coordinates the timing to ensure infrared light is stopped in advance before visible-light signal input begins.
Solution Approach 2:
The patent implements periodic action through alternating between infrared and visible-light illumination cycles. The light sources and video signals are switched in periodic intervals, with each mode (infrared or visible-light) being activated for a specific duration followed by deactivation. This periodic switching pattern ensures that residual images from one wavelength band do not persist into the next cycle, preventing crosstalk while maintaining the ability to display both types of videos.
2Duration of action of stationary object
If voltage is continuously applied to display elements during frame switching, then display continuity is maintained, but residual images persist causing visual crosstalk
Solution Approach 1:
The patent applies preliminary action by creating a transition period where voltage to display elements is reduced or interrupted before switching between infrared and visible-light frames. This preliminary voltage adjustment prevents the persistence of previous frame images on the display elements, eliminating residual image effects while maintaining overall display continuity through coordinated light source and signal switching.
Data Source
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AI summary
A display device includes a plurality of display elements, a first light source that emits first illumination light, a second light source that emits second illumination light, a signal synthesizing unit configured to generate a mixed image signal based on an input signal, a pixel control unit configured to, based on the mixed image signal, control a voltage applied to the display elements, and a light source control unit configured to control the first and second light sources. During period in which the second illumination light is emitted, the pixel control unit is configured to control a voltage applied to some display elements of the plurality of display elements according to signal value of the input signal and at same time, regardless of signal value of the input signal, set a voltage applied to some other display elements of the plurality of display elements to a constant value.