Abstract: A display device according to an embodiment includes: a substrate; a transistor that is disposed on the substrate; a light emitting diode that is disposed on the substrate, and connected to the transistor; and a passivation layer that is disposed between the transistor and the light emitting diode, wherein a surface step of the passivation layer is within a range of and including 1 nm to 30 nm.

Abstract: An encoding device for selectively transmitting not only the picture of a 1.times.NTSC level but also the superhigh resolution pictures of 2.times.NTSC, 3.times.NTSC or 4.times.NTSC levels, by reducing the bandwidth of sub-bands and by using a sub-band coding technique in the case where the bandwidth of channels is restricted. The device includes a 3-dimensional low pass filter 4 for separating the signal output from an A/D converter 3 into 3-dimensional sub-blocks of chrominance signal, and a matrix circuit 5 for separating the signals output from the A/D converter 3 into luminance and chrominance signals. Furthermore, a horizontal, vertical and temporal QMFs 6, 8 and 10 divides the luminance signal into a plurality of horizontal, vertical and temporal sub-blocks in the direction of a horizontal, vertical and temporal axes and compresses the above sub-blocks. A motion detector 15 detects a motion signal corresponding to a still region, a semi-motion region and a motion region.

Abstract: An encoding system of a simulcast high definition television and a method thereof capable of encoding an image signal of high picture quality and an aural signal of high tone quality. In order to improve a MIT proposal system, the bandwidth of a baseband image signal of a high definition television is compressed by a three-dimensional sub-band coding, divided sub-blocks are adaptively selected and modulated. Thereafter, the adaptive modulated signal is scrambled, transmission-gamma-processed, data-under-processed and processed by a double side band-quadrature modulation (DSB-QM). Thus, good picture quality in comparison with the MIT proposal system is obtainable.

Abstract: A method for 90.degree. phase-shift modulation and demodulation in a circuit having a PLL. A phase-shift of 90.degree. between a main and an additional signal is provided. The method comprises the steps of: modulating by (a) selecting a specified position and inserting a pilot signal, (b) giving the phase-shift of 90.degree. to an image carrier wave and (c) generating a modulated signal; and demodulating by (d) receiving the modulated signal and demodulating the main and additional signals having phase-shift of 90.degree. to each other, (e) generating a frequency locked to the transmitted signal and controlling an output of a voltage controlled oscillator and reproducing the main and additional signals of step (d).