278results about How to "Stable brightness" patented technology

An image display device which has a stable luminous brightness among pixels. An on / off control switch 15 for stopping the driving operation of a light emitting element 13 is provided in a pixel 1. A change in the luminous brightness caused by a variation in the characteristic of the light emitting element 13 is suppressed by feeding a result measured by a current measuring circuit provided in one end of a power line 4 back to a drive signal for the light emitting element 13.

An LED driving module suitable to drive a plurality of LED strings in parallel connection is disclosed. The LED driving module includes a voltage converting apparatus, a conduction voltage detecting apparatus, a reference voltage generating apparatus and a current-adjusting apparatus. The voltage converting apparatus produces a driving voltage according to a conduction voltage. The conduction voltage detecting apparatus detects the conducting states of the LED strings for producing a conduction voltage and an enabling signal. The reference voltage generating apparatus generates a first reference voltage according to the enabling signal. The current-adjusting apparatus produces a plurality of driving currents according to the first reference voltage, and the driving currents flow through the LED strings.

An LED lighting device can compensate a brightness change and a color change caused by a temperature change and exhibit an in-plane uniform luminance and color. A lighting device includes: at least one line connected in parallel, a constant voltage source for applying a constant voltage to the line, an ON / OFF controller, and a current detector for measuring a value of current flowing in the line. The line is formed by one or more light-emitting diodes and a switch for turning ON / OFF the current flowing in the light emitting diodes connected in series. According to the current value of each of the lines measured by the current detector, the ON / OFF controller controls the ON / OFF period of the switch of each of the lines.

An LED lighting device can compensate a brightness change and a color change caused by a temperature change and exhibit an in-plane uniform luminance and color. A lighting device includes: at least one line connected in parallel, a constant voltage source for applying a constant voltage to the line, an ON / OFF controller, and a current detector for measuring a value of current flowing in the line. The line is formed by one or more light-emitting diodes and a switch for turning ON / OFF the current flowing in the light emitting diodes connected in series. According to the current value of each of the lines measured by the current detector, the ON / OFF controller controls the ON / OFF period of the switch of each of the lines.

An LED driving module suitable to drive a plurality of LED strings in parallel connection is disclosed. The LED driving module includes a voltage converting apparatus, a conduction voltage detecting apparatus, a reference voltage generating apparatus and a current-adjusting apparatus. The voltage converting apparatus produces a driving voltage according to a conduction voltage. The conduction voltage detecting apparatus detects the conducting states of the LED strings for producing a conduction voltage and an enabling signal. The reference voltage generating apparatus generates a first reference voltage according to the enabling signal. The current-adjusting apparatus produces a plurality of driving currents according to the first reference voltage, and the driving currents flow through the LED strings.

A backlight unit 12 includes LED units 17, a light guide plate 18 and a follow-up mechanism. The light guide plate 18 has light entrance surfaces 18b and a light exit surface 18a. The light entrance surfaces 18b are provided so as to face the respective LED units 17. The light exit surface 18a is provided parallel to an arrangement direction in which the LED units 17 and the light entrance surface 18b are arranged (i.e., the Y-axis direction) and such that light exits therethrough. The follow-up mechanism is configured to move the LED unit 17U in the arrangement direction in response to a deformation of the light guide plate 18. The follow-up mechanism includes a support member 20 that supports the LED unit 17U. The support member is in contact with a surface of the light guide plate 18 along the light entrance surface 18bU.

A driving circuit of a light emitting diode (LED) includes a rectifier unit, a voltage-dividing circuit, a control unit, a voltage converter, a resistance and a capacitor. The rectifier unit rectifies an AC power to generate a first operation voltage. The voltage-dividing circuit generates a voltage-dividing signal. The control unit includes a regulating unit and a pulse width modulation (PWM) unit. An output terminal of the regulating unit is coupled to the PWM unit. The PWM unit outputs a PWM signal. The voltage converter adjusts a driving voltage and a driving current of the LED. The resistance is coupled between an output terminal of the regulating unit and a diode. The capacitor is coupled between a power input terminal of the regulating unit and a ground terminal. The PWM unit adjusts the PWM signal according to the voltage-dividing signal and a feedback signal output by the voltage converter.

Provided is a lighting device, comprising: a light source module comprising: at least one light source disposed on a printed circuit board; and a resin layer disposed on the printed circuit board so that the light source is embedded; a light reflection member formed on at least any one of one side surface and another side surface of the resin layer; and a diffusion plate having an upper surface formed on the light source module, and a side wall which is integrally formed with the upper surface and formed to extend in a lower side direction and which is adhered onto the light reflection member, wherein a first separated space is formed between the light source module and the upper surface of the diffusion plate, whereby flexibility of the product itself can be secured, and durability and reliability of the product can be also improved.

In order to enable a display image with stable display colors and display brightness to be obtained quickly even when the optical intensity characteristic of a laser light source changes due to a harsh usage environment, a Dimmer unit is equipped with: a first light detection unit that modulates the light intensity of composite laser light emitted from a composite laser light emission unit, and detects the light intensity of the composite laser light before entering the Dimmer unit; and a second light detection unit that detects the light intensity of the composite laser light after entering the Dimmer unit. The light intensity characteristic for each color in the composite laser light emission unit is calculated on the basis of the light intensity detected by the first light detection unit, and the white balance of each color in the composite laser light emission unit is adjusted on the basis of the light intensity detected by the second light detection unit.

An active matrix type electroluminescence display device is provided which comprises a plurality of display pixels GS11, GS12, GS13, arranged in a matrix of rows and columns; gate signal lines GL1, GL2, Gli connected to and shared by a plurality of display pixels arranged in each row; and gate drive circuits for sequentially supplying a select signal SCAN to the gate signal lines GL1, GL2, GL3, Gli. Each display pixel includes an electroluminescence element, a first thin film transistor in which a display signal DATA is applied to the drain and which is switched on and off in response to the select signal SCAN, and a second thin film transistor for driving the EL element based on the display signal DATA. The gate drive circuits are placed so that each of the gate signal lines GL1, GL2, GL3, Gli is driven from both ends.

The invention relates to a method for adjusting the luminosity of a display and a related backlight module. The standard luminosity is found according to the detected temperature and actual luminosity of the backlight module and a target luminosity value used by the display. In addition, when the actual luminosity is adjusted, the influence caused by ambient light is also considered, so that the adjusted actual luminosity is not interfered by the ambient light. The method solves the problem of the luminance of the common color sequence type display is insufficient when the luminance of the light-emitting diode of the backlight module is non-linearly changed and the light-emitting diode is aged caused by the factors such as the increment of service time, the change of the temperature and the like.

The present invention provides a device and method for controlling screen brightness. The method comprises: a light sensor acquiring a brightness signal intensity value of external environment and transmitting the brightness signal intensity value to a comparator; the comparator comparing the received brightness signal intensity value with a stored brightness signal intensity value and outputting a comparison result to an integrator; if the comparison result is that the received brightness signal intensity value is greater than the stored brightness signal intensity value, the integrator increasing the stored brightness signal intensity value by a fixed value according to the comparison result; and if the comparison result is that the received brightness signal intensity value is less than the stored brightness signal intensity value, the integrator decreasing the stored brightness signal intensity value by a fixed value according to the comparison result.

The invention provides a method, device and system for stabilizing the luminance of an organic electroluminescence display and relates to the technical field of display. The method, device and system for stabilizing the luminance of the organic electroluminescence display solve the problem that the display luminance of an existing display is unstable as the display time shortens. According to the method for stabilizing the luminance of the organic electroluminescence display, the display comprises sub-pixels in three primary colors including red, green and blue. The method includes the step that the different colors of sub-pixels are compensated for respectively according to the relations between the luminance of the different colors of sub-pixels and the display time, so that when the display time of the display is within a preset time interval range, the different colors of sub-pixels are displayed in the luminance range of a reference luminance interval.

A backlight device (12) is provided with: an LED unit (17); a light guide plate (18), which has a light incoming surface (18b) arranged to face the LED unit (17), and a light outgoing surface (18a) which is arranged parallel to the arrangement direction (Y axis direction) of the LED unit (17) and the light incoming surface (18b) and outputs light; and a follow-up mechanism which moves the LED unit (17U) in the arrangement direction corresponding to deformation of the light guide plate (18). The follow-up mechanism has a supporting member (20) which supports an LED unit (17U), and the supporting member (20) abuts on the surface which is parallel to the light incoming surface (18bU) of the light guide plate (18).

The invention discloses a method and a device for facilitating user self-timing. A flash light can rotate to a frontend intelligent terminal along with the rotation of a camera; when a user performing self-timing under the dark light is detected, the flash lamp is opened and continuously illuminated to provide stable brightness for the user, and an LED (light emitting diode) lamp of a screen is opened to provide light ray compensation for the user, so the sensory stimuli of single light source is weakened, the brightness of the flash lamp is controlled, and is close to the brightness of the screen, the comfortability of the user sensing the light source is further improved, and a good self-timing environment is created.

The invention relates to an infrared image multi level mean contrast intensification method. The existing image intensifying method is not suitable for the realization of FPGA. The said infrared image multi level mean contrast intensification method comprises multi level mean computation, median filtering, linear intensification with redundant computation removed, getting value X0 and X1 through multi level mean approximation method to add the stability of the treated image, synthetically with the FPGA better than the traditional classic computation realization. Through simple contrast device, accumulator, counter, small circuit scale, less required hardware, low cost, timely feature, it can effectively adapt to the high requirement for infrared imaging equipment image intensification, for the benefit of promotion.

A drive circuit for light emitting diode (LED) is provided, which is used to drive a plurality of LEDs to emit light. The LEDs are connected in series into a plurality of LED strings. The drive circuit includes a power converter, a detection circuit, and a report circuit. The power converter provides a driving voltage to the LED strings, and the detection circuit detects a string voltage of each LED string, and compares the string voltage with a default reference voltage, so as to determine whether the string voltage is different from the reference voltage (which indicates that the LED string is operated under a non-default state), and sends a detection signal to the report circuit. The report circuit receives the detection signal and outputs the control signal to the power converter, such that the power converter adjusts the driving voltage according to the control signal.

An LCD driving scaler capable of reducing electromagnetic interference employs a spread spectrum phase locked loop (PLL) in which a multi-phase voltage controlled oscillator oscillates and outputs a scaler pixel clock signal and a plurality of oscillation signals of different phases. A spread spectrum processor counts clock periods of a reference pixel clock signal when a horizontal synchronization signal having an adjusted frame rate is activated, and sequentially outputs the plurality of oscillation signals in response to a decoding signal. The plurality of oscillation signals are output to a main divider, which generates the main divider signal by dividing the frequencies of the plurality of oscillation signals. A main divider signal is input into a phase frequency detector, which detects a phase difference between the predivider signal and the main divider signal and outputs the phase difference signal so that the frequency of the scaler pixel clock signal repeatedly varies.

An image display device which has a stable luminous brightness among pixels. An on / off control switch 15 for stopping the driving operation of a light emitting element 13 is provided in a pixel 1. A change in the luminous brightness caused by a variation in the characteristic of the light emitting element 13 is suppressed by feeding a result measured by a current measuring circuit provided in one end of a power line 4 back to a drive signal for the light emitting element 13.

The present invention provides a device and method for controlling screen brightness. The method comprises: a light sensor acquiring a brightness signal intensity value of external environment and transmitting the brightness signal intensity value to a comparator; the comparator comparing the received brightness signal intensity value with a stored brightness signal intensity value and outputting a comparison result to an integrator; if the comparison result is that the received brightness signal intensity value is greater than the stored brightness signal intensity value, the integrator increasing the stored brightness signal intensity value by a fixed value according to the comparison result; and if the comparison result is that the received brightness signal intensity value is less than the stored brightness signal intensity value, the integrator decreasing the stored brightness signal intensity value by a fixed value according to the comparison result.

The invention provides a projection light source brightness output method. The projection light source brightness output method comprises the following steps: obtaining a ratio of a first maximum gray level value of the N frame of image to a second maximum gray level value of the N+M frame of image in real time to obtain an adjustment coefficient, performing weighting calculation on the N+M frame of image signal according to the adjustment coefficient, judging whether the number of gray level values of base colors reaching to a preset gray level value in the N+M frame of image signal after the weighting calculation is equal to a preset threshold, if so, adjusting the projection light source brightness to a set value, and if not, adjusting the projection light source brightness to 1 / G of the original one. According to the projection light source brightness output method provided by the invention, the projection light source brightness can be dynamically adjusted, so that a projection light source is not always in a high-load working state, a certain energy saving effect can be realized, the service life of the light source is prolonged, and the output stability of projection images is ensured at the same time.

An illumination device and a control method of the illumination device are provided. The illumination device includes a thermal sensor and a light emitting diode (LED) module. The control method include steps of: enabling the thermal sensor to detect the environment temperature outside the illumination device, and comparing the environment temperature with a threshold value, wherein if the environment temperature is higher than the threshold value, the driven current of the LED module is reduced and the thermal sensor is shut down within a continued period of time.

An electro-luminescence display device includes an electro-luminescence panel having a plurality of pixels at pixel areas defined by intersections between data lines and first and second gate lines, each of the pixels including: an electro-luminescence cell connected to receive a supply voltage, and a first cell driver and a second cell driver for alternately controlling a current flow into the electro-luminescence cell.

A backlight device has a light guide plate, a rotary member, a rotary drive mechanism for rotating the rotary member, a plurality of mercury-free fluorescent lamps, and a power feed control mechanism. Each of the mercury-free fluorescent lamps has an arc tube mounted on the rotary member so as to extend parallel to the rotary shaft, a mercury-free discharge medium consisting of a rare gas sealed within the arc tube, and first and second electrodes for exciting the discharge medium. The mercury-free fluorescent lamps respectively emit lights of different colors. The emitted light enters the light guide plate through its light incident face and emerges from its light emission face.

Provided is a lighting device, including: a light source module comprising at least one light source on a printed circuit board, and a resin layer in which the light source is embedded; a light reflection member which is adjacent to at least any one of one side surface and the other side surface of the resin layer; and an optical plate comprising a side wall which is closely adhered to the light reflection member, and an upper surface which covers an upper part of the light source module, wherein a haze of the optical plate is less than 30%.

An optical collector for an automotive dipped headlight module comprises an optical collecting structure (1), a cut-off line forming structure (2), a 50L dark region forming structure (3), an III region forming structure (4) and an SEG 10 brightness reducing structure (5). The III region forming structure (4) comprises an III region broadening forming structure (4-1) and an HV brightness reducing structure (4-2); and the cut-off line forming structure (2) is arranged at the front end of the optical collector, the SEG 10 brightness reducing structure (5) is arranged on the bottom of the optical collector, the III region forming structure (4) is arranged on the bottom of the optical collector and is positioned at the front end of the SEG 10 brightness reducing structure (5), and the 50 L dark region forming structure (3) is arranged on the bottom of the optical collector, and is positioned between the III region forming structure (4) and the cut-off line forming structure (2). According to the optical collector for the automotive dipped headlight module, except a lens, all other optical elements and parts of the optical collector are integrated, and therefore, space utilization efficiency is greatly improved; positional accuracy of various optical functional components is guaranteed, and position errors do not exist; and costs are low.

The present disclosure provides an array substrate for an organic light-emitting diode (OLED) display panel. The array substrate includes a substrate, a thin film transistor (TFT) layer comprising a plurality of TFTs, and an anode layer comprising a plurality of anode electrodes. The array substrate also includes an organic layer comprising a plurality of organic units corresponding to anode electrodes, and a cathode layer comprising a plurality of touch electrodes for a time-sharing operation. Each touch electrode corresponds to a portion of the plurality of organic units, the plurality of the touch electrodes being arranged to be applied with a normal cathode voltage in a displaying period and to be applied with a touch cathode voltage in a touch-sensing period.

The invention relates to an intelligent dimming toning method and a device for a multi-color LED illumination light source and relates to an LED illumination light source. The intelligent multi-color LED illumination light source is provided with a power source module, a driving control module and an LED illumination module, wherein the power source module is provided with an AC-DC unit and a DC-DC unit, the power source module is connected with a power source port of the driving control module, the driving control module is provided with a wideband antenna, a multi-mode radio frequency processing unit, a data storage unit, a single-chip microcomputer, a constant current driving unit, a power source port, a feedback port and a driving bus port, and the LED illumination module is provided with a distributed temperature sensor, a red light LED, a green light LED, a blue light LED and a white light LED. According to the intelligent multi-color LED illumination light source, compatibility of and support for the multi-mode wireless networking technology can be realized; on the basis of the white light LED, through collocation of the red, green and blue light LEDs, the color temperature of the mixed-color light is adjustable, high color rendering is realized, and no-lower-than-95 high color rendering indexes can be realized.

The present invention discloses an illuminator for a dental drill, which comprises a body having a front end and a rear end and having an accommodation room thereinside, a drill installed at the front end of the body, and an illuminator having a light-emitting diode (LED). The body further has an opening-located portion, and the opening-located portion has a through-hole. The LED is installed in the through-hole and has a light-emitting portion facing outward from the through-hole. The present invention adopts a LED as the light source and is simpler and cheaper than the conventional illuminator using an electric bulb or optical fibers.