Abstract: A display device including: a first transistor configured to control a control current based on a voltage of a first node; a second transistor configured to electrically connect a second node that is a first electrode of the first transistor to a first data line in response to a scan write signal; a third transistor configured to control a driving current based on a voltage of a third node; a fourth transistor configured to electrically connect a fourth node that is a first electrode of the third transistor to a second data line in response to the scan write signal; a fifth transistor configured to control the driving current based on a voltage of a fifth node having received the control current; and a light emitting element configured to receive the driving current, wherein the fifth transistor is of a different type from that of the first to fourth transistors.

Abstract: An organic light emitting diode display device and a brightness driving method thereof are disclosed. The display device includes a display brightness value adjustment unit configured to adjust a display brightness value within a predetermined display brightness value interval and a data driving unit configured to receive a display brightness value and output different data voltages according to whether the display brightness value is equal to a display brightness value configured to correspond to a voltage switch point of a predetermined cathode voltage interval such that a brightness difference between any adjacent two of display brightness value is within a predetermined range.

Abstract: The present disclosure relates to a pixel circuit including an optical fingerprint sensing circuit, a method for driving a pixel circuit including the optical fingerprint sensing circuit, and a display device including the pixel circuit including the optical fingerprint sensing circuit. The pixel circuit includes: a self-light emitting element which displays images by a driving current controlled by a driving transistor; and a light-receiving element which receives light emitted from the self-light emitting element and reflected through a fingerprint of a user and converts it into a photocurrent. The driving transistor functions as a buffer which transmits an output voltage of the light-receiving element to an output line of the pixel circuit.

Abstract: The present invention relates to a selectively controllable microLED system, and more specifically, to a technology having a transparent microLED display skin that is formed to be worn on the outer surface of any one from among a specific device, a specific product, and a body part, having a master unit and a remote slave for controlling the transparent microLED display skin that are independently or respectively formed on one side of any one from among the specific device, the specific product, and the body part, and having a smartphone allowing a wearer to ultimately and selectively control the transparent microLED display skin, and thus the present invention enables the color of any one from among the specific device, the specific product, and the body part to be selectively changed according to the current situation of the wearer.

Abstract: A photosensitive circuit, a driving method thereof and an electronic device are disclosed. The photosensitive circuit includes a photosensitive element and a signal acquisition circuit. The photosensitive element is configured to be able to generate a photosensitive voltage signal by changing threshold characteristic of the photosensitive element according to intensity of light incident into the photosensitive element; and the signal acquisition circuit configured to convert the photosensitive voltage signal into a photosensitive current signal.

Abstract: An electronic device is provided. The electronic device includes a display screen including a multiplex pixel array having multiplex sub-pixels, wherein a driving signal is inputted to the display screen; and a camera disposed behind the display screen and corresponding to positions of the multiplex sub-pixels. The display screen further includes a control unit configured to control the multiplex sub-pixels not to receive the driving signal when receiving an instruction for taking pictures.

Abstract: A touch display device includes a first substrate, an active layer disposed on the first substrate, a gate insulation film disposed on the first substrate with the active layer disposed thereon, a gate electrode disposed at a position overlapping with the active layer, an inter-layer insulation film disposed on the gate insulation film with the gate electrode disposed thereon, a pixel electrode disposed on the inter-layer insulation film, a first protection layer disposed on the inter-layer insulation film with the pixel electrode disposed thereon, a first electrode disposed on the first protection layer and connected to the active layer through a first contact hole, and a second electrode disposed on the inter-layer insulation film, connected to the active layer through a second contact hole, and connected to the pixel electrode through a third contact hole.

Abstract: A method and an apparatus for fingerprint collection are provided. The method includes: lighting up pixels of a plurality of light source regions on a display panel according to a preset timing sequence, where each light source region includes one or more pixels, all the light source regions are simultaneously lighted up during a first time period and none of light source regions is lighted up during a second time period; controlling a photoelectric sensing module to collect first and second optical signals respectively in the first and second time periods, the first optical signal including a reflected light signal formed by reflecting, with a light-transmissive cover plate, light from the light source regions; correcting the collected first optical signal based on the second optical signal, where the display panel and the photoelectric sensing module are disposed at a same side of the light-transmissive cover plate.

Abstract: The present disclosure relates to a target object detection method, a readable storage medium and an electronic device. The method is periodically executed and the method includes: identifying a target object based on first N frames of image data obtained within a current execution period, wherein N is a positive integer, and N is less than the total number of frames of image data that can be obtained within the current execution period; and if the target object is identified, tracking the target object based on the obtained image data within the remaining time period of the current execution period. In the above technical solution, when the target object is identified, the identified target object is tracked within the remaining time period of the current execution period, so that the data calculation amount can be effectively reduced.

Abstract: A display device including a display panel is provided. The display panel includes a first substrate, a first transistor, a sensing element, a first conductive layer and a second conductive layer. The first transistor is disposed on the first substrate. The sensing element is disposed on the first substrate and electrically connected to the first transistor. The sensing element includes a first-type semiconductor layer, an insulation layer and a second-type semiconductor layer. The insulation layer is disposed on the first-type semiconductor layer. The second-type semiconductor layer is disposed on the insulation layer. The first conductive layer is disposed between the first substrate and the sensing element, and the first conductive layer contacts with and electrically connected to the first-type semiconductor layer. The second conductive layer is disposed on the sensing element, and the second conductive layer contacts with and electrically connected to the second-type semiconductor layer.

Abstract: An electronic device may have a display with an array of pixels that display images for a user. The electronic device may have an ambient light sensor for gathering ambient light information. A subset of the pixels in the array of pixels may overlap the ambient light sensor so that ambient light passing through the subset of pixels may be measured. Each pixel may have an emission enable transistor coupled in series with a light-emitting diode. Control circuitry in the electronic device may disable the subset of pixels to reduce stray light during ambient light measurements while enabling remaining pixels in the array of pixels to display an image. Ambient light sensor circuitry may gather ambient light sensor measurements over one or more periods by using transfer transistors to transfer change from the photodetectors to charge storage capacitors formed from floating diffusions in a common substrate.

Abstract: A mobile terminal includes a housing having a front side, a rear side and lateral sides; a cover window disposed on the front side of the housing and defining a display area and a bezel area, wherein the bezel area includes printed color under an edge of the cover window; an OLED display unit disposed between the cover window and the front side of the housing; and a sensing unit disposed under the OLED display unit. Further, the OLED display unit includes a substrate having a hole below the display area of the cover window; a transistor layer including thin film transistors and being disposed on the substrate and having a hole corresponding to the hole of the substrate; an organic light emitting layer disposed on the transistor layer and having a hole corresponding to the hole of the transistor layer; and an encapsulation layer disposed on the organic light emitting layer and having a hole corresponding to the hole of the organic light emitting layer.

Abstract: A power control and delivery system for improving and prolonging the performance of batteries through a total power source comprised of a battery, a power controller and a power buffer.

Abstract: A method and system of compensating for localized phenomena in a display is disclosed. The display includes an array of pixels and a control system for adjusting content data signals for the array of pixels to compensate for aging of the pixels in the array. The control system measures a parameter of at least one of the pixels in the array via a read input of the at least one of the pixels. The controller determines the effect of the localized phenomena on the pixel using the parameter. A characteristic is measured for at least one of the pixels in the array via the read input of the at least one of the pixels. The measured characteristic is adjusted to reduce the effect of the localized phenomena. An adjusted aging compensation value based on the adjusted measured characteristic is calculated by the controller. The aging compensation value is applied to a data content signal to at least one of the pixels.

Abstract: A method of driving a display panel includes adjusting a level of a data sustaining voltage or an on bias voltage during an on bias compensating period, applying the on bias voltage to pixels through data lines during an on bias period, which is subsequent to the on bias compensating period, to adjust a voltage level of control electrodes of driving transistors of the pixels, initiating a voltage of anode electrodes of organic light emitting elements of the pixels during an initiating period, applying data voltages to the pixels through the data lines during a scanning period, and turning on the organic light emitting elements of the pixels during an emission period.

Abstract: A driving voltage control method and apparatus, an array substrate, and a display device, wherein a plurality of predetermined areas (11a) are preset within a display area (11), and corresponding to any of the predetermined areas, the apparatus comprises an acquisition module (21) configured to acquire a luminance value of a pixel cell with the maximum luminance within the predetermined area (11a) in any frame, a search module (22) configured to search a preset table for a corresponding driving voltage value according to the luminance value acquired by the acquisition module and a control module (23) configured to control a driving voltage outputted to all the pixel cells within the predetermined area (11a) in a next frame according to the driving voltage value obtained by the search module. The driving voltage for the display device in any image can be reduced without affecting the display effect of the image.

Abstract: A starting method for a liquid crystal display, which includes: after receiving a control command for starting, reading a checking code of a control code for indicating to perform a predetermined screen processing from a flash memory on a photoelectronic board; comparing the checking code read from the flash memory on the photoelectronic board with the checking code stored in a flash memory on a control board; performing the predetermined screen processing based on the read control code for indicating to perform the predetermined screen processing. By adopting the above starting method of the liquid crystal display, starting time of the liquid crystal display is effectively shortened.

Abstract: In the 1st case, which is the case of driving a color display panel, pieces of color image data corresponding to 1st to 3rd colors are received in parallel, and in a horizontal scan period, pixels connected to ith to (i+2)th gate lines from among 1st to nth gate lines are driven according to the pieces of color image data corresponding to the 1st to 3rd colors. In the 2nd case, which is the case of driving a monochrome display panel, pieces of monochrome image data (DM1[7:0] to DM3[7:0]) for three horizontal scan lines are received in parallel, and in a horizontal scan period, pixels connected to jth to (j+2)th gate lines from among 1st to mth gate lines (gate lines G1 to G960) are driven according to the pieces of monochrome image data (DM1[7:0] to DM3[7:0]).

Abstract: A method and system of compensating for localized phenomena in a display is disclosed. The display includes an array of pixels and a control system for adjusting content data signals for the array of pixels to compensate for aging of the pixels in the array. The control system measures a parameter of at least one of the pixels in the array via a read input of the at least one of the pixels. The controller determines the effect of the localized phenomena on the pixel using the parameter. A characteristic is measured for at least one of the pixels in the array via the read input of the at least one of the pixels. The measured characteristic is adjusted to reduce the effect of the localized phenomena. An adjusted aging compensation value based on the adjusted measured characteristic is calculated by the controller. The aging compensation value is applied to a data content signal to at least one of the pixels.

Abstract: The present disclosure relates to the art of display manufacture. There are provided a pixel circuit, a driving method for the same and a display device.

Abstract: The present invention provides an optical module capable of achieving downsizing and high densification, and reducing crosstalk as compared to a conventional optical module. An optical module includes: an optical device including multiple light receiving elements; a control device which transmits and receives signals to and from the optical device; and a substrate including multiple lines which allow passage of the signals. Anode terminals of the multiple light receiving elements are connected to different lines by first wires, respectively. Cathode terminals of the multiple light receiving elements are connected to different lines by second wires, respectively. Each first wire and the corresponding second wire cross each other and are disposed out of contact with each other. The wires connecting each light receiving element and the control device, namely, the wires of each channel cross each other.

Abstract: A system and method for implementing a display which also serves as one or more of a tactile user interface touchscreen, proximate hand gesture sensor, light field sensor, lensless imaging camera, document scanner, fingerprint scanner, and secure optical communications interface. In an implementation, an OLED array can be used for light sensing as well as light emission functions. In one implementation a single OLED array is used as the only optoelectronic user interface element in the system. In another implementation two OLED arrays are used, each performing and/or optimized from different functions. In another implementation, an LCD and an OLED array are used in various configurations. The resulting arrangements allow for sharing of both optoelectric devices as well as associated electronics and computational processors, and are accordingly advantageous for use in handheld devices such as cellphone, smartphones, PDAs, tablet computers, and other such devices.

Abstract: A device for driving a light-emitting diode, a light-emitting device, and a display device are disclosed. The disclosed light-emitting diode driving device may include: a first transistor having a first conductive electrode connected with a source voltage terminal and having a second conductive electrode connected with an input terminal of the light-emitting diode; a second transistor having a control electrode connected with the second conductive electrode of the first transistor; and a capacitor having one end connected with a data voltage terminal and having the other end connected with a first node, which is connected with a control electrode of the first transistor and with a first conductive electrode of the second transistor.

Abstract: A multifunctional pixel is disclosed. The multifunctional pixel may include a display pixel, a photoelectric sensor, and a second sensor. The second sensor may include one of the following: an ultrasonic sensor and an infrared sensor. The display pixel, the photoelectric sensor, and the second sensor may be located in the multifunctional pixel.

Abstract: An organic light emitting element includes an organic light emitting diode formed on a substrate, coupled to a transistor including a gate, a source and a drain and including a first electrode, an organic thin film layer and a second electrode; a photo diode formed on the substrate and having a semiconductor layer including a high-concentration P doping region, a low-concentration P doping region, an intrinsic region and a high-concentration N doping region; and a controller that controls luminance of light emitted from the organic light emitting diode, to a constant level by controlling a voltage applied to the first electrode and the second electrode according to the voltage outputted from the photo diode.

Abstract: Described is an (organic) light-emitting diode ((O)LED) wherein the light-emitting layer comprises a blend of an electroluminescent semiconducting material with a ferro-electric material. Either of the electrodes forms a modulatable injection barrier with the ferro-electric material, the modulation requiring a voltage Vm serving to polarize or repolarize the ferro-electric material. With Vm being larger than the voltage Ve required for light emission, the (O)LED can be turned “on” or “off” by applying a pulse voltage to (re)polarize the ferro-electric material.

Abstract: In a display device with optical sensors, a mode control portion (24) determines a mode to be a normal mode in which to operate a recognition processing portion (22) or a standby mode in which to stop the recognition processing portion (22) from operating. In transition from the normal mode to the standby mode, a decimated image memory (25) stores a decimated image having a smaller number of pixels than a scan picture. The mode control portion (24) performs pixel-by-pixel comparison between the stored decimated image and an image supplied anew, which is obtained by averaging decimated images for two consecutive frames, and causes transition from the standby mode to the normal mode when the number of pixels whose difference in pixel values is greater than or equal to a first threshold is greater than or equal to a second threshold. As a result, it is rendered possible to inhibit erroneous determination and promptly detect a touch position after a quick exit from the standby mode.

Abstract: An array of pixel assemblies emitting multiple wavelengths in a direction and a method therefor, the array comprising: a plurality of pixel assemblies, each respective pixel assembly having a respective pixel area, the respective pixel assembly formed by: one or more waveguides made from electro-optically active material; a plurality of different wavelength emitters, the different wavelength emitters disposed at one or more of the ends of the respective one or more waveguides to propagate their respective wavelengths therealong and capable of being switched; and a one switch disposed to cause when activated, a shifting of the wavelengths propagating in the one or more waveguides of the pixel assembly by substantially 90 degrees to be emitted through the respective pixel area; and a backplane with an electronic circuit for switching the plurality of switches and the emitters.

Abstract: Disclosed herein is a display apparatus, including: a pixel array section including a plurality of pixels, a writing transistor, a driving transistor, a first switching transistor, a holding capacitor, and a second switching transistor; a first scanning section configured to drive the writing transistor in a unit of a row of the pixels; a second scanning section configured to drive the switching transistors in synchronism with scanning by the first scanning section; and a third scanning section configured to control the second switching transistors to a non-conducting state within a period after the image signal is written by the writing transistor until the signal writing period of the same row of the pixels ends but to a conducting state within any other period.

Abstract: The invention provides an image display device capable of reducing the transmission delay of a scanning signal. A plurality of scanning signal lines are wired in one pixel circuit row. Pixel circuits of the pixel circuit row are connected to any of the plurality of scanning signal lines.

Abstract: There is provided an optical recording display device having a display section. The display section includes: a plurality of pixels; a plurality of pixel electrodes each of which is formed for each of the plurality of pixels, and is connected to a transistor; a common electrode which is opposite to the plurality of pixel electrodes, and an electro-optical material layer having a memory property which is disposed between the plurality of pixel electrodes and the common electrode; a plurality of scanning lines which is respectively connected to a gate of the transistor and is connected to each other in a direct manner or through an electric circuit; and a plurality of data lines which is respectively connected to a source of the transistor and is connected to each other in a direct manner or through an electric circuit.

Abstract: A semiconductor device includes a photodiode, a first transistor, a second transistor, and a third transistor. The second transistor and the third transistor have a function of retaining a charge accumulated in a gate of the first transistor. In a period during which the second transistor and the third transistor are off, a voltage level of a voltage applied to a gate of the second transistor is set to be lower than a voltage level of a source of the second transistor and a voltage level of a drain of the second transistor, and a voltage level of a voltage applied to a gate of the third transistor is set to be lower than a voltage level of a source of the third transistor and a voltage level of a drain of the third transistor.

Abstract: An image projection device includes a number-of-times measurement section that measures the number of passage times that the scanned laser light has passed through the light radiation members, a time measurement section that is triggered to measure an elapsed time when the number-of-times measurement section measures the number of passage times, an arithmetic section that calculates an initial timing at which the laser light source section starts outputting the laser light based on the measurement results of the number-of-times measurement section and the time measurement section, and a signal generation section that generates the switch signal at the initial timing calculated by the arithmetic section.

Abstract: A display panel, ensuring high photo-detection accuracy in a region near a frame area, is provided. The display panel includes: image display elements disposed in an effective display area of a display screen; a light-shielding layer disposed in a frame area around the effective display area; and photo-detection elements disposed in the effective display area or in both of the effective display area and the frame area. The photo-detection elements detect the invisible light. The light-shielding layer transmits invisible light, while shields visible light.

Abstract: An organic light emitting display includes a display unit that includes scan lines and data lines. First sub-pixels, second sub-pixels, and third sub-pixels that emit light corresponding to different colors are repeatedly arranged in a uniform pattern. The organic light emitting display also includes a scan driver for supplying scan signals to the scan lines; a data driver coupled to one end of each of the data lines for supplying data signals to the data lines; a switch unit coupled between the one end of each of the data lines and the data driver to transmit the data signals supplied from output lines of the data driver to the data lines; and a test circuit unit including transistors coupled to other ends of the data lines. The first sub-pixels and the second sub-pixels are alternately arranged in same columns and the third sub-pixels are arranged in columns adjacent to the same columns.

Abstract: A light sensing circuit using an oxide semiconductor transistor, a method of manufacturing the light sensing circuit, and an optical touch panel including the light sensing circuit. Because the light sensing circuit includes only one light sensor transistor and one switch transistor formed on the same substrate, a structure of the light sensing circuit is simplified. Furthermore, because the light sensor transistor and the switch transistor have the same structure, a method of manufacturing the light sensing circuit is also simplified. Also, since an optical touch panel or an image acquisition apparatus using the light sensing circuit uses the light sensing circuit having a simple structure and does not use a capacitor, the optical touch panel or the image acquisition apparatus may be made thinner and larger.

Abstract: An emission control circuit for controlling emission of R, G, B EL elements and method for driving an organic light emitting diode display using the same. An emission control signal generating circuit of a flat panel display includes a plurality of pixels. Each pixel includes a plurality of EL elements, and emission of the elements is controlled by emission control signals. The circuit includes a first signal generating device for generating one of the emission control signals, and a plurality of second signal generating devices for generating other ones of the emission control signals using an output signal of the first signal generating device and an external control signal. The first signal generating device may include a shift register. Each of the plurality of second signal generating devices may include a NAND gate using the external signal and the external control signal, or an inverted signal thereof, as two inputs.

Abstract: A semiconductor device capable of high-speed operation. The semiconductor device includes a first transistor, a second transistor, and a capacitor. One of a source and a drain of the first transistor is supplied with a first signal. One of a source and a drain of the second transistor is supplied with a first potential. A gate of the second transistor is supplied with a second signal. A first electrode of the capacitor is electrically connected to the other of the source and the drain of the first transistor. A second electrode of the capacitor is electrically connected to the other of the source and the drain of the second transistor. In a first period, the first signal is low and the second signal is high. In a second period, the first signal is high and the second signal is either low or high.

Abstract: A lightweight, thin, small size semiconductor device is provided. A pixel has a display portion, and a light receiving portion comprising a photodiode. A transistor is used with the semiconductor device for controlling the operation of the display portion and the light receiving portion.

Abstract: An EL display apparatus according to the present invention includes EL device (15) adapted to emit light at a luminance corresponding to a current fed thereto. A source driver (14) outputs a current higher than a current corresponding to an image signal to the EL device (16) through a source signal line (18). This operation charges/discharges a parasitic capacitance present in the source signal line (18). A transistor (11d) formed between the EL device (15) and the source driver (14) operates so that the EL device (15) is fed with the current for only a part of a one-frame period. As a result, the El device (15) emits light for only the part of the period.

Abstract: Method, apparatus and systems for driving electroluminescent segments in electroluminescent displays are disclosed. Each segment in the display receives a series of first pulses alternating in polarity at a first electrode and a series of second pulses at a second electrode. Each of the second pulses corresponds to one of the first pulses and is opposite in polarity. The width of the second pulses corresponds to the parasitic resistance of the segment.

Abstract: Fluorescent screens and display systems and devices based on such screens using at least one excitation optical beam to excite one or more fluorescent materials on a screen which emit light to form images. The fluorescent materials may include phosphor materials and non-phosphor materials such as quantum dots. A screen may include a multi-layer dichroic layer.

Abstract: The present invention relates to a front light system which can be built with thin film light emitting diodes (LEDs), such as organic light emitting diodes (OLEDs) or electro-luminescent light emitting diodes. The front light system may be built on a thin and flexible substrate and can generate lighting of satisfactory uniformity and with high efficiency. The system also can potentially be inexpensive. The front light system of the present invention is particularly suitable for keymat applications wherein a flexible reflective display on top of a touch sensitive surface or device, is used as an output device.

Abstract: A scanning projector includes an optical filter. The optical filter exhibits a variable attenuation as a function of position. The scanning projector may scan sinusoidally in at least one dimension. The variable attenuation of the optical filter compensates for brightness variations due to sinusoidal scanning.

Abstract: A method of driving a pixel element an active matrix display. The method inducing a change of the bias voltage of the first transistor towards the threshold voltage thereof with a current passing through a resistive element in the pixel element to cause the bias voltage of the first transistor at time t linearly depend upon an exponential decaying function exp(?t/?) with a predetermined time constant ?. The method also includes terminating light emitted from the light-emitting element after the bias voltage of the first transistor becomes substantially close to the threshold voltage of the first transistor.

Abstract: Fluorescent screens and display systems and devices based on such screens using at least one excitation optical beam to excite one or more fluorescent materials on a screen which emit light to form images. The fluorescent materials may include phosphor materials and non-phosphor materials such as quantum dots. A screen may include a multi-layer dichroic layer.

Abstract: A self light emitting device having a function of correcting drops in brightness in self light emitting elements in a pixel portion, and capable of displaying a uniform image without brightness irregularities, is provided. A specific test pattern is displayed when an electric power source is connected, brightnesses are detected by photoelectric conversion elements arranged in each pixel, and then stored in a memory circuit. A correction circuit then corrects a first image signal based on portions which are insufficient from standard brightnesses (brightnesses of normal self light emitting elements at the same gray stale, stored in advance), and a second image signal is obtained. Display of an image in a display device is performed in accordance with the second image signal.

Abstract: Various embodiments of an ambient light sensor configured to determine the direction of a beam of light incident thereon are disclosed. In one embodiment, an ambient light sensor is provided that comprises a plurality of light detectors arranged in a spatial array upon a light sensing surface. Each of the light detectors in the array is configured to generate an analog output voltage in response to the beam of ambient light falling thereon. The amount of light incident on the individual light detectors in the spatial array varies according to the position of each such sensor with respect to direction of the beam of ambient light. An analog-to-digital converter (ADC) is operably coupled to the plurality of light detectors and is configured to receive the analog output signals generated thereby as inputs thereto, and to provide digital output values representative of the analog signals.

Abstract: An image display panel includes: a lower substrate; self-light emitting elements for image display that are arranged on the lower substrate in a matrix shape and form an image display unit; a self-light emitting element for monitoring that is arranged on the lower substrate and emits monitoring light for the image display unit; and an upper substrate that holds the self-light emitting elements for image display and the self-light emitting element for monitoring in conjunction with the lower substrate, wherein the self-light emitting elements for image display emit emission light to the lower substrate side or the upper substrate side, and the self-light emitting element for monitoring emits the monitoring light to at least the upper substrate side or the lower substrate side.

Abstract: A data driver capable of displaying images with a substantially uniform brightness, an organic light emitting display device using the same, and a method of driving the organic light emitting display device. The data driver includes a plurality of current sink units for controlling predetermined currents to flow through data lines, a plurality of voltage generators for resetting values of gray scale voltages using compensation voltages generated when the predetermined currents flow, a plurality of digital-to-analog converters for selecting one gray scale voltage among the gray scale voltages as a data signal in response to bit values of the data supplied from the outside, and a plurality of switching units for supplying the data signal to the data lines. The predetermined currents may be set equal to pixel currents that correspond to a maximum brightness.