49results about How to "Luminance is limited" patented technology

An emission control driver includes a plurality of stages, each of the plurality of stages including a first driver for outputting a first output signal corresponding to one of the first output signal output from a previous stage or a first start pulse; a second driver for outputting a second output signal corresponding to one of the second output signal output from the previous stage or a second start pulse; and a third driver for receiving the first and second output signals and for outputting an emission control signal.

A display device has a predetermined display region and includes an array substrate equipped with a drive circuit, and a light sensor for measuring outside illuminance and a temperature sensor both installed on the array substrate. A control method for the display device includes using the light sensor to measure outside illuminance and using an output of the temperature sensor to correct an output of the light sensor, thereby adjusting luminance in the display region. The display device may further include an opposed substrate in opposition to the array substrate, a liquid crystal layer sandwiched between the two substrates to form the predetermined display region, and a backlight, thereby constituting a liquid crystal display device. Another configuration of a display device has a predetermined display region and includes an array substrate equipped with a drive circuit for display, and a light sensor installed on the array substrate for measuring outside illuminance, a filtering circuit for filtering a signal output from the light sensor and a processing circuit for processing the signal output from the light sensor and then filtered with the filtering means.

An image displaying apparatus includes a signal control unit for receiving an input image signal and converting the signal into a signal for alternately displaying a right-eye image and a left-eye image, display panel into which the signal converted in the signal control unit is input for the right-eye image and the left-eye image, a surface light source for illuminating the display panel from its back, a shutter control unit for generating a timing signal indicating a period in which the right-eye and left-eye shutters are opened for a pair of viewing glasses with the right-eye and left-eye shutters, and for relatively changing the shutter-opened period for the emission timing of the surface light source, and a surface light source control unit for emitting the surface light source in a shorter period than the shutter-opened period in response to the switching between the right-eye image and the left-eye image.

A liquid crystal display apparatus includes an LCD panel assembly. A backlight assembly includes a light source that irradiates the LCD panel assembly. A light-sensing part generates a detection signal corresponding to a quantity of the light. A reference signal-generating part generates a reference signal corresponding to a reference quantity of the light. A control signal-generating part compares the detection signal with the reference signal to generate a control signal. A backlight assembly-controlling part controls the luminance of the light source in accordance with the control signal.

A gate driver circuit, a display panel, and a display device. A number of emission start signals, with at least one a delay time, a pulse width, or a combination thereof, are supplied in a frame period in which display driving is performed at a low driving frequency. This decreases a degree by which luminance appearing in the frame period is reduced, or changes characteristics of frequency components of luminance, thereby preventing flicker from being observed. The display driving is performed at the low driving frequency reduces power consumption, and is performed at a lower driving frequency to improve the efficiency of the display device.

A system and method for controlling subsections of an LED backlight for a liquid crystal display (LCD). Exemplary embodiments analyze the histograms for each subsection of the LCD which corresponds with the subsections of the LED backlight in order to produce a proper luminance for the backlight subsection. The proper luminance may be less than the maximum or typical luminance that is produced by common LED backlights. By reducing the luminance the resulting display can have less power consumption, longer lifetime, and higher contrast ratios. The original subpixel voltages for the LCD are re-scaled based on the proper luminance for the backlight subsection. Virtual backlight data may be created to simulate the luminance at each subpixel and the virtual backlight data may be used to re-scale the original subpixel voltages. The virtual backlight data may be used to blend between adjacent subsections of the LED backlight which may be producing different levels of luminance.

A drive circuit (DR) drives a plurality of LED strings (DS1, DS2; DS10) each comprising at least one LED (Di). The drive circuit comprises a resonance inductor (K1), and a plurality of branches which each comprise a series arrangement of a resonance capacitor (C31, C32; C34, C35) and an associated one of the plurality of LED strings (DS1, DS2; DS10). The resonance capacitor (C31, C32; C34, C35) is arranged between the resonance inductor (K1) and its associated one of the plurality of LED strings (DS1, DS2; DS10) to receive a resonance voltage (VAC) from the resonance inductor (K1). A level and frequency of the resonance voltage (VAC) and an impedance of the resonance capacitor (C31, C32; C34, C35) are selected to obtain a current source supplying a LED current (IL1 IL2; IL10) through the associated one of the plurality of LED strings (DS1, DS2; DS10) which is substantially independent on a tolerance on forward voltages of LED's of the associated one of the plurality of LED strings (DS1, DS2; DS10).

An AMOLED display panel comprising a plurality of color elements in each pixel with each of the color elements comprising a discrete plurality of illuminating units associated with a plurality of transistors operating in a binary mode. The plurality of illuminating units have different sizes in accordance with 2n size, where n is the illuminating unit's number. n may also be the bit position of the bit line that controls the illuminating unit. The collective luminance of each color element can be digitally controlled by selectively activating a combination of the discrete illuminating units to their nominal luminance. The discrete plurality of illuminating units in each pixel may be directly controlled by RGB pixel data without the requirement for digital analog conversion.

A display device includes a display panel having a display area in which a plurality of display pixels are two-dimensionally arranged, to display image information, a power supply driving section applying, to each of the display pixels in the display area, one of a first power supply voltage having a voltage value at which the display pixel is set to a non-display-operation state and a second power supply voltage having a voltage value at which the display pixel is set to a display operation state, and a control section controlling the power supply driving section to set a area-ratio of an first area in the display area in which the display pixels to which the first power supply voltage is applied are arranged to an second area in which the display pixels to which the second power supply voltage is applied are arranged.

A plasma display device in which, regardless of whether the display data amount is large or small, the variances in the luminance can be suppressed, the gradation of the display data can be faithfully displayed, the display quality is excellent, the power consumption is small, and a method of driving the plasma display device. A subfield-by-subfield display load calculating part calculates display load amount allocated to the respective subfields from the display data with respect to each of the subfields. Based on the calculated data of the display load amount, a sustain frequency calculating part calculates optimum sustain frequencies for the respective subfields. A sustain frequency controller within a drive controller generates sustain pulse voltage data based on the sustain frequencies calculated with respect to each of the subfields.

A display device has a predetermined display region and includes an array substrate equipped with a drive circuit, and a light sensor for measuring outside illuminance and a temperature sensor both installed on the array substrate. A control method for the display device includes using the light sensor to measure outside illuminance and using an output of the temperature sensor to correct an output of the light sensor, thereby adjusting luminance in the display region. The display device may further include an opposed substrate in opposition to the array substrate, a liquid crystal layer sandwiched between the two substrates to form the predetermined display region, and a backlight, thereby constituting a liquid crystal display device. Another configuration of a display device has a predetermined display region and includes an array substrate equipped with a drive circuit for display, and a light sensor installed on the array substrate for measuring outside illuminance, a filtering circuit for filtering a signal output from the light sensor and a processing circuit for processing the signal output from the light sensor and then filtered with the filtering means.

In a conventional display device using light emitting elements, white color cannot be accurately displayed since the luminance of each sub-pixel varies for each color. Therefore, in order to achieve the uniformity in luminance of each sub-pixel, the amount of current or the current density flowing in light emitting elements is required to be changed for each color. In that case, a power source is necessarily provided for each color, thus an external circuit is increased, leading to increase in the cost and power consumption. According to the invention, a variable channel-size MOS transistor is used as a transistor for driving a light emitting element. When a signal voltage applied to a control gate is controlled for each sub-pixel, the amount of current or the current density flowing in light emitting elements can be adjusted and luminance of each sub-pixel can also be adjusted for each color.

A light emitting diode driving apparatus includes: a switching converter having an inductor and a switching device; a plurality of serial light emitting diode lines each having a plurality of light emitting diodes connected in series; a plurality of rectifier diodes respectively connected in series to the plurality of serial light emitting diode lines; a plurality of capacitors respectively connected to nodes between the serial light emitting diode lines and the rectifier diodes for smoothing a voltage; and one or more current distribution coils disposed between the switching converter and the plurality of serial light emitting diode lines to let a current flow in a direction of canceling out a magnetic flux generated by a first winding and a magnetic flux generated by a second winding each other, thereby making currents flowing in the serial light emitting diode lines equal to each other.

The present invention discloses an electronic ballast with dimming control from power line sensing for a fluorescent lamp, comprising: a control voltage generator, used to generate a control voltage according to a switching count of a power line; an oscillator, used to generate an oscillating signal, wherein the oscillating signal is of a fixed frequency and has a rising voltage portion and a falling voltage portion; and a comparator, used to generate a high side gating signal according to voltage comparison of the oscillating signal and the control voltage.

Disclosed is a backlight unit including a light guide member including one side surface and the other side surface parallel to the one side surface, a light source module disposed on the one side surface of the light guide member, and a local dimming part disposed on the light guide member and including a liquid crystal layer, wherein the liquid crystal layer has an inclined surface disposed between the one side surface and the other side surface of the light guide member.

A method of driving a light-source module includes adjusting a frequency of a boosting switching signal based on a dimming signal which controls luminance of a light-emitting diode (“LED”) string of the light-source module, where the LED string comprises a plurality of LEDs connected to each other in series, and controlling a main transistor in response to the boosting switching signal to transfer a driving voltage to the LED string.

A light emitting device includes at least one light emitting unit, a first switching unit, an energy storage unit and an optical sensing-control unit. The first switching unit is electrically connected to the light emitting unit. The energy storage unit is electrically connected to the first switching unit and stores electrical energy. The optical sensing-control unit electrically connected to the energy storage unit senses a light emitting energy of the light emitting unit and adjusts the electrical energy according to the light emitting energy. The first switching unit turns on and off according to the electrical energy so as to control the light emitting unit.

An illumination system includes a plurality of light source modules and at least one condenser lens. Each of the light source modules includes a first color light source and a wavelength conversion element. The first color light source is configured to provide a first color beam as an excitation beam. The wavelength conversion element is disposed on a transmission path of the first color beam and configured to convert the first color beam into a converted beam. The at least one condenser lens is disposed on transmission paths of the plurality of converted beams from the plurality of wavelength conversion elements and the plurality of first color beams. A projection apparatus including the illumination system is also provided.

A display device comprises a display panel where an input image including a moving image and a still image is displayed; a controller configured to generate a gain for decreasing a peak luminance of the still image and modulate a pixel data of the still image by the gain; and a display panel drive circuit configured to write the pixel data received from the controller to sub-pixels of the display panel, wherein the gain is set to be a different value on a different position on the display panel.

A method of driving a display having a light emitting diode (LED) is provided. A driving pulse of a pulse width modulation method is applied to each pixel by a drive circuit, and a time for illuminating a red light, a blue light, and a green light, which are three primary colors, of each pixel is controlled, thereby controlling the luminance of the pixel.

The present invention relates to an automatic lighting control system, and more particularly, to an automatic lighting control system which is capable of predicting a movement route of a resident in a complex building and automatically controlling lighting located in the movement route. According to the present invention, it is possible to reduce power consumption by simplifying configuration of lamps and controlling luminance of lamps on a resident or vehicle movement route by predicting motion of the resident or the vehicle through centralized control for a plurality of lamps, and to provide increased movement convenience and emotional satisfaction of a resident by showing the resident a movement route through lamps and securing a field of view on the movement route.

A display device includes: a target pixel; observation target pixels located adjacent to the target pixel; and a grayscale corrector for converting an input grayscale value corresponding to the target pixel with reference to observation target grayscale values corresponding to the observation target pixels. The grayscale corrector includes: a light emitting pixel counter for providing a number of light emitting pixels by counting a number of observation target pixels that exceeds a reference value; and a grayscale converter for providing a converted grayscale value by converting the input grayscale value, based on the number of light emitting pixels.

A light source apparatus and a light source adjusting module are provided. The light source apparatus includes a power supply, a phase modulator, an electrical transformer, a light source adjusting module and a light-emitting device. The power supply provides a first AC voltage signal. The phase modulator receives the first AC voltage signal and adjusts a conducting phase of the first AC voltage signal to generate a modulated AC voltage signal. The electrical transformer transforms the modulated AC voltage signal to generate a second AC voltage signal. The light adjusting module generates a luminance adjusting signal according to a state of the second AC voltage signal. The light-emitting device receives the luminance adjusting signal to generate a corresponding light source.

A quantum dot white light-emitting diode includes a cathode, an anode, and a light-emitting layer disposed therebetween. The light-emitting layer includes: a blue fluorescent organic layer, a spacer layer, and a quantum dot light-emitting layer. The blue fluorescent organic layer is disposed near the cathode side, the quantum dot light-emitting layer is disposed near the anode side, and the spacer layer is disposed between the blue fluorescent organic layer and the quantum dot light-emitting layer. A material of the quantum dot light-emitting layer contains quantum dots, a material of the blue fluorescent organic layer contains a blue fluorescent organic material, and a material of the spacer layer contains a spacer material. A triplet exciton energy of the spacer material is greater than a triplet exciton energy of the blue fluorescent organic material, and a triplet exciton energy of the spacer material is greater than a quantum dot exciton energy.