Abstract: A driving circuit includes: a display driver to generate a horizontal synchronization signal and a vertical synchronization signal according to a first clock signal of a first oscillator; a sensor driver to generate a touch signal according to a second clock signal of a second oscillator; and a determination circuit to detect a cycle of at least one of the horizontal synchronization signal or the vertical synchronization signal according to the second clock signal, and output a detection signal when the cycle is out of a range. The determination circuit is a part of the display driver or the sensor driver.

Abstract: A wearable display device according to one or more embodiments of the present invention includes: a substrate; a first sensing unit on the substrate; and a display unit arranged on the first sensing unit and including a light emitting element that emits first light to a front side to display an image and emits second light to a rear side facing the substrate, the first sensing unit being configured to measure a bio-signal generated from a user's body using the second light reflected from the user's body.

Abstract: An image display device includes a cathode ray tube for displaying images, a case enclosing the cathode ray tube while forming the outer appearance thereof, and a support partially receiving the cathode ray tube and connected to the case to support the case. The support includes: a post, with one end portion connected to the case, a support portion tightly fitted to the case to support the case, and a portion proceeding substantially vertical to the ground surface; and a base connected to the post to stand the post erect.