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 surface light source device includes a light source body, a partition member, an isolating member and a voltage applying part. The light source body has an internal space into which discharge gas is injected. The partition wall divides the internal space into discharge spaces. The partition wall has a connection hole that connects the discharge spaces with each other. The isolating member is disposed such that the isolating member corresponds to the connection hole. The isolating member seals the connection hole to isolate the discharge spaces from each other. The voltage applying part induces discharge of the discharge gas in the discharge spaces. Thus, current drift is prevented.

Abstract: A discharge gas is injected into a plurality of discharge spaces of a surface light source device that has an aspect ratio of about 0.07 to about 0.85. The discharge gas has a pressure of about 10 torr to about 120 torr with respect to a temperature for lighting the discharge gas. The discharge gas includes an inert gas having a neon gas and an argon gas. The argon gas has an amount of about 0% to about 60% by volume with respect to the neon gas. The discharge gas may function as to optimize a light-emitting efficiency of the surface light source device so that the surface light source device may have improved luminance.

Abstract: A surface light source device includes a source body having a plurality of discharge spaces formed along a first direction, and electrodes for generating a dielectric barrier discharge in the discharge spaces formed on both end portions of an outer face of the light source body along a second direction substantially perpendicular to the first direction. The electrodes have capacitances that vary along the second direction. The capacitance for generating a visible ray varies in accordance with a lengthwise direction of the electrode so that the surface light source device may have improved luminance uniformity.

Abstract: A surface light source device includes a light source body having a plurality of discharge spaces into which a discharge gas is injected, an external electrode provided on the outer face of the light source body to apply a discharge voltage to the discharge gas so as to generate plasma in the light source body, and a porous internal electrode arranged in the light source body to provide secondary electrons to the plasma, thereby properly maintaining the plasma. The porous internal electrode includes a porous member, and a conductive layer formed on an outer face of the porous member. The secondary electrons are continuously emitted from the porous internal electrode so that an amount of the plasma is steadily maintained.

Abstract: A surface light source device includes a light source body having an internal space into which a discharge gas is injected, and an electrode for applying a voltage to the discharge gas. Partition walls are arranged in the internal space to divide the internal space into a plurality of discharge spaces. To reduce areas of the partition walls, a groove is formed at a side face of each partition wall. Thus, each partition wall has a reduced area so that the partition walls may not act as dark fields of the surface light source device.

Abstract: A surface light source device includes a first substrate, a second substrate and an electrode. The first and second substrate defines a discharge space into which a discharge gas is injected. The electrode applies a voltage to the discharge gas. Any one of the first and second substrates includes a sodalime glass. The sodalime glass includes an ion-exchanging layer containing potassium ions that are ion-exchanged for sodium ions. Since the surface light source device does not have the sodium ions, a discoloring of the surface light source device due to an elution of the sodium ions may be prevented. Further, the sodalime glass may have an enhanced strength.

Abstract: A surface light source device includes a light source body having an inner space into which a discharge gas is injected, and an electrode for applying a voltage to the discharge gas. The light source body includes partition walls dividing the inner space into a plurality of discharge spaces. The partition walls have a width for suppressing formation of a parasite capacitance through which a current flows therein.

Abstract: A surface light source device includes a light source body having discharge spaces into which a discharge gas is injected. The light source body has a protruded portion corresponding to a remaining portion of a tip that is used for exhausting the discharge spaces and injecting a mercury gas into the discharge spaces. An electrode for applying a voltage to the discharge gas is formed on the light source body to cover the protruded portion.

Abstract: A planar light source device includes a body, a plurality of partition members, and first and second electrodes. The body includes a discharge space. The partition member divides the discharge space into a plurality of discharge regions. The first electrodes are disposed at the edge portions of the body, and a discharge voltage is applied to the first electrodes. The second electrode is disposed between the partition members. Therefore, the second electrode corresponding to the discharge region prevents deflection to enhance optical characteristics of the planar light source device. Furthermore, the second electrode lowers a discharge start time and reduces a discharging time.

Abstract: A surface light source device includes a light source body, a partition member, an isolating member and a voltage applying part. The light source body has an internal space into which discharge gas is injected. The partition wall divides the internal space into discharge spaces. The partition wall has a connection hole that connects the discharge spaces with each other. The isolating member is disposed such that the isolating member corresponds to the connection hole. The isolating member seals the connection hole to isolate the discharge spaces from each other. The voltage applying part induces discharge of the discharge gas in the discharge spaces. Thus, current drift is prevented.