Nec Display Solutions, Ltd.

Nec Viewtechnology, Ltd.

Sharp Nec Display Solutions, Ltd.

Tooru Kataoka

Keisuke Momose

Eifuu Nezu

A display device includes: a display unit daisy-chain connected to a source device that outputs an image signal encoded with a prescribed version of a standard specified as a prescribed standard, displaying an image generated by decoding the image signal encoded with the prescribed version; a determination unit that determines the number of connected sink devices that are daisy-chain connected to the source device; and a setting unit that sets, from among the prescribed versions, a version in which the image that was generated by decoding the image signal encoded by the source device is displayable on the display units of all of the daisy-chain connected sink devices, depending on the number of connected sink devices.

Display device, display method, and program

A signal discriminating and monitoring circuit provides a full black detection circuit which detects a full black signal input during the change of the video signal and holds the detection result of the full black signal only during the specified time period. When a full black video signal is detected in the full black detection circuit, the signal discriminating and monitoring circuit detects whether the resolution of the video signal input has changed by determining whether the frequency of the horizontal synchronization signal included in the video signal of the next frame to be input changed above a preset value. When a change in the resolution of the video signal is detected, the change detected signal indicates that the detection result is output. When a scalar circuit receives the change detected signal, the video display signal is output as a constant value in order to set the display video in the static state.

Video display device

A display device uses a field sequential color scheme. Assume that a panel video writing period defines a period from the start of writing image data into a display panel to the completion of displaying the image on the basis of the image data in a sub-frame. A light source driving circuit generates a driving signal for gradually increasing the luminance of a light source of a color corresponding to a displayed image in the present sub-frame from zero to a predetermined value within the panel video writing period of the present sub-frame and for gradually decreasing the luminance of the light source from the predetermined value to zero within the panel video writing period of the next sub-frame. A light source driver drives the light source to emit light in accordance with the driving signal.

Video display device and light source driving method thereof

A synchronization processing circuit separates synchronizing signals from an input video signal, provides the synchronizing signals to a detection circuit, and further provides the input video signal that has no synchronizing signal to a scaler circuit. The detection circuit detects the horizontal synchronization frequency, the vertical synchronization frequency, the synchronization polarity, the synchronization type (Sep, CS, or GSync), the scan type, the image line number, the synchronization type (TriSync), and the vertical synchronization width from the synchronizing signals. A CPU determines the type of input video signal based on the detection results of the detection circuit. Based on the determination results, the CPU sets the signal processing for the input video signal in the synchronization processing circuit and in the scaler circuit.

Video signal determination device, a video display device, a video signal determination method, and a video display method for determining the type of a video signal that contains a synchronizing signal

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Tokyo, Japan

Tooru Kataoka