A pixel includes: a light emitting element; a first transistor which drives the light emitting element; a second transistor electrically connected between a gate node of the first transistor and a data line; a third transistor electrically connected between a first node of the first transistor and an initialization voltage line; and a storage capacitor electrically connected between the gate node and the first node of the first transistor. Here, upon an operation in a variable frame mode, an initialization voltage is applied to the initialization voltage line, and the initialization voltage has a first voltage level. In addition, in a data writing period during which the storage capacitor is charged with an electric charge, the initialization voltage further includes a pulse voltage such that the initialization voltage has a second voltage level that is greater than the first voltage level.

The present disclosure relates to a technology for driving an LED, comprising sensing a forward-direction voltage of an LED and determining whether or not the LED is defective by comparing the forward-direction voltage with a comparative object voltage, wherein the comparative object voltage is continuously updated using a sensed forward-direction voltage so that the comparative object voltage may be set to be an unfixed value, that is, a value reflecting a current state of an LED. This allows a more accurate detection of a defect of an LED.

An electronic device is provided. The electronic device includes a tunable component and a first source follower circuit. The tunable component is electrically connected to a circuit node. The first source follower circuit is electrically connected to the circuit node. The first source follower circuit includes a first control terminal and a first terminal. The first control terminal is electrically connected to the first terminal.

The present disclosure provides a current mirror circuit including a first transistor configured to be supplied with a data current from a data driving circuit; a second transistor configured to drive a light emitting diode by mirroring the data current transferred to the first transistor; a capacitor disposed between the first transistor and the second transistor and configured to store a voltage of a gate terminal of the second transistor therein; and a first switch disposed between the first transistor and the second transistor and configured to adjust an input current of the gate terminal of the second transistor.

An output buffer is disclosed that includes: a buffer circuit that outputs an output signal to an output terminal based on a first input signal provided to a first input terminal and a second input signal provided to a second input terminal; and a current supply circuit that is connected in parallel to the buffer circuit, and provides an auxiliary current to the output terminal based on the first input signal and the second input signal.

A light emitter board includes a substrate having a mount surface on which first and second light emitters are mountable, and at least one pixel unit on the mount surface, including a drive circuit and first and second drive lines. The first drive line as a primary line and the second drive line as a redundant line are connected in parallel to the drive circuit. The pixel unit includes, on the mount surface, first positive and negative electrode pads connectable to the first light emitter, and second positive and negative electrode pads to the second light emitter. The first positive or negative electrode pad is connected to the first drive line, and the second positive or negative electrode pad to the second drive line.

The display panel includes an upper display substrate including a display area and a non-display area adjacent to the display area and a lower display substrate that faces the upper display substrate to emit first color light, the lower display substrate including a plurality of display elements respectively overlapping the pixel areas. The display area includes a plurality of pixel areas and a light blocking area adjacent to the pixel areas. The upper display substrate includes a base substrate, a first light control layer on the base substrate to control the first color light, a capping layer including an absorption part overlapping the display area and on the first light control layer and a barrier part overlapping the light blocking area and protruding from the absorption part in a thickness direction of the base substrate, and a second light control layer on the barrier part.

An embodiment relates to a pixel sensing technique. By supplying a precharge voltage to a sensing line using an amplifier used in pixel sensing, it is possible to minimize differences between precharge voltages of sensing lines and solve a crosstalk problem between the sensing lines, while not increasing a size of a pixel sensing device.

An embodiment relates to a technique for driving an LED display. In a method of controlling grayscale of pixels dividedly by N subframes (N is a natural number of 2 or greater), a pulse width modulation (PWM) control value of each subframe may be calculated by a precalculator disposed at a front end of latches, thereby simplifying a circuit.

Embodiments relate to a display device with reduced scanning time by using a reference line separate from a data line to improve frame rate of the display device. A first pixel in a first row samples a reference voltage during a first period and samples a data voltage during a second period. A second pixel in a second row adjacent to the first row samples the reference voltage during a third period and samples the data voltage during a fourth period, where the third period overlaps with at least a portion of the second period. The reference voltage is provided by the reference line that is connected to a reference buffer, and the data voltage is provided by the data line connected to a source driver circuit.