Abstract: A viewing angle adjusting member and an electronic device including the same are provided. The viewing angle adjusting member includes a first transparent film including a first transparent electrode layer, a second transparent film including a second transparent electrode layer, and a blocking material provided between the first transparent film and the second transparent film and containing nanoparticles configured to block light. The viewing angle adjusting member may be configured to adjust a position of the nanoparticles according to an electrical signal applied to at least one of the first transparent electrode layer and the second transparent electrode layer.

Abstract: A display substrate is disclosed. The disclosed display substrate can comprise: a thin film transistor substrate; a plurality of micro LEDs arranged on one surface of the thin film transistor substrate; a rear substrate having one surface coupled to the other surface of the thin film transistor substrate, and having at least a part of an edge protruding further than the edge of the thin film transistor substrate so as to form a stepped part together with the thin film transistor substrate; and a plurality of wirings formed on the stepped part and the other surface of the rear substrate so as to electrically connect the one surface of the thin film transistor substrate and the other surface of the rear substrate.

Abstract: A trisilylamine preparation apparatus includes: a reactor in which a trisilylamine synthesis reaction occurs; a reactant supply pipe for supplying reactants to the reactor; a trisilylamine discharge pipe for discharging trisilylamine from the reactor; a reactor heating means for heating the reaction space of the reactor; and a gaseous by-product discharge pipe for discharging a gaseous by-product from the reactor. The reaction space of the reactor is maintained at a temperature that is lower than the decomposition temperature of a reaction by-product generated during the synthesis reaction, the reactor heating means heats the reaction space of the reactor to a temperature that is higher than or equal to the decomposition temperature after trisilylamine is discharged through the trisilylamine discharge pipe, and the gaseous by-product discharge pipe discharges a gaseous by-product comprising a pyrolysate of the reaction by-product, generated through pyrolysis by means of the reactor heating means.

Abstract: An image projection apparatus according to an embodiment of the present invention senses the distance to an image projection area to which an image is projected, and determines an image projection state including a state of at least one of the image projection area and a space between the image projection apparatus and the image projection area, on the basis of the sensed distance. The image projection apparatus projects an image onto the image projection area on the basis of the determined image projection state.

Abstract: An image projection apparatus according to an embodiment of the present invention senses the distance to an image projection area to which an image is projected, and determines an image projection state including a state of at least one of the image projection area and a space between the image projection apparatus and the image projection area, on the basis of the sensed distance. The image projection apparatus projects an image onto the image projection area on the basis of the determined image projection state.

Abstract: The present invention relates to a system and method for providing prepaid telecommunication services. More particularly, prepaid telephone calls can be made by users without entering any access code, if such calls are made from telephone numbers previously registered in the telecommunication system in connection with valid access codes. Prepaid telephone calls can also be made from non-registered telephone numbers after providing the telecommunication system with a valid access code.

Abstract: The present invention relates to a system and method for providing prepaid telecommunication services. More particularly, prepaid telephone calls can be made by users without entering any access code, if such calls are made from telephone numbers previously registered in the telecommunication system in connection with valid access codes. Prepaid telephone calls can also be made from non-registered telephone numbers after providing the telecommunication system with a valid access code.

Abstract: The present invention relates to a system and method for providing prepaid telecommunication services. More particularly, prepaid telephone calls can be made by users without entering any access code, if such calls are made from telephone numbers previously registered in the telecommunication system in connection with valid access codes. Prepaid telephone calls can also be made From non-registered telephone numbers after providing the telecommunication system with a valid access code.

Abstract: The present invention relates to a system and method for providing prepaid telecommunication services. More particularly, prepaid telephone calls can be made by users without entering any access code, if such calls are made from telephone numbers previously registered in the telecommunication system in connection with valid access codes. Prepaid telephone calls can also be made from non-registered telephone numbers after providing the telecommunication system with a valid access code.

Abstract: The present invention relates to a system and method for providing prepaid telecommunication services. More particularly, prepaid telephone calls can be made by users without entering any access code, if such calls are made from telephone numbers previously registered in the telecommunication system in connection with valid access codes. Prepaid telephone calls can also be made from non-registered telephone numbers after providing the telecommunication system with a valid access code.

Abstract: The present invention relates to a system and method for providing prepaid telecommunication services. More particularly, prepaid telephone calls can be made by users without entering any access code, if such calls are made from telephone numbers previously registered in the telecommunication system in connection with valid access codes. Prepaid telephone calls can also be made from non-registered telephone numbers after providing the telecommunication system with a valid access code.

Abstract: The present invention relates to a system and method for providing prepaid telecommunication services. More particularly, prepaid telephone calls can be made by users without entering any access code, if such calls are made from telephone numbers previously registered in the telecommunication system in connection with valid access codes. Prepaid telephone calls can also be made from non-registered telephone numbers after providing the telecommunication system with a valid access code.