Abstract: The present invention relates to a polyester resin and a preparation method therefor. Specifically, provided, in an embodiment of the present invention, is a polyester resin including: a copolymer including a diacid moiety and a diol moiety; a phosphorus-based heat stabilizer; and a complementary colorant, wherein the diacid moiety includes a furandicarboxylic acid-based compound-derived moiety, the diol moiety includes an alkylene glycol-based compound-derived moiety, the phosphorus-based heat stabilizer includes an ester group at the terminal end thereof, and the complementary colorant includes a blue dye and a red dye.

Abstract: A three-dimensional holographic display device includes a light emitting diode (LED) array including a plurality of light sources controlled to sequentially output light according to a preset pattern, a lens configured to refract light incident from the LED array, a spatial light modulator (SLM) configured to modulate light incident from the lens, and a processor configured to generate a plurality of holographic signals each comprising depth information adjusted according to an arrangement location of each of the plurality of light sources, and for each of the plurality of light sources, control the SLM to modulate the light based on a holographic signal corresponding to the light source.

Abstract: A printed circuit board includes: an insulating layer; a plurality of pads disposed on the insulating layer; and a plurality of insulating walls disposed on the insulating layer, and at least partially covering side surfaces of the plurality of pads, respectively, while being free from surfaces of the plurality of pads, respectively. The plurality of insulating walls are disposed to be spaced apart from each other on the insulating layer.

Abstract: An embodiment of the present invention provides a large-area heater. The large-area heater comprises: a heating plate including a central area in which heat is concentrated and a peripheral area surrounding the central area; and a plurality of unit heaters for heating at least a part of the central area and at least a part of the peripheral area, wherein each of the plurality of unit heaters comprises: a plurality of heat emitting areas producing different amounts of heat; a plurality of power wires for independently transmitting power to the plurality of heating areas, respectively; and pairs of power terminals which are arranged at the corner of each of the unit heaters so as to supply power to the plurality of power wires, the number of pairs of power terminals corresponding to the number of the plurality of heat emitting areas.